JP4098170B2 - Support for image recording material, method for producing the same, and image recording material - Google Patents

Description

【０１３８】
〔トナー受像層の諸物性〕
前記トナー受像層は、定着部材との定着温度における１８０度剥離強さが、０．１Ｎ／２５ｍｍ以下が好ましく、０．０４１Ｎ／２５ｍｍ以下がより好ましい。
ここで、前記１８０度剥離強さは、定着部材の表面素材を用い、ＪＩＳ Ｋ６８８７に記載の方法に準拠して測定することができる。
前記トナー受像層は、白色度が高いのが好ましい。該白色度としては、ＪＩＳＰ８１２３に規定される方法で測定して、８５％以上が好ましい。また、４４０ｎｍ〜６４０ｎｍの波長域で、分光反射率が８５％以上、かつ同波長域の最大分光反射率と最低分光反射率の差が５％以内が好ましい。更には、４００ｎｍ〜７００ｎｍの波長域で分光反射率が８５％以上、かつ同波長域の最大分光反射率と最低分光反射率の差が５％以内がより好ましい。
また、前記白色度としては、具体的には、ＣＩＥ １９７６（Ｌ^＊ａ^＊ｂ^＊）色空間において、Ｌ^＊値は８０以上が好ましく、８５以上がより好ましく、９０以上が更に好ましい。また、白色色味はできるだけニュートラルであるのが好ましい。前記白色色味としては、Ｌ^＊ａ^＊ｂ^＊空間において、（ａ^＊）^２＋（ｂ^＊）^２の値は５０以下が好ましく、１８以下がより好ましく、５以下が更に好ましい。
【０１３９】
前記トナー受像層としては、光沢度が高いのが好ましい。前記光沢度としては、トナーが無い白色から最大濃度の黒色までの全領域において、４５度光沢度は６０以上が好ましく、７５以上がより好ましく、９０以上が更に好ましい。
但し、前記光沢度は１１０以下が好ましい。前記光沢度が、１１０を超えると、金属光沢のようになり、画質としては好ましくない。
尚、前記光沢度は、ＪＩＳ Ｚ８７４１に基づいて測定することができる。
【０１４０】
前記トナー受像層は、平滑性が高いのが好ましい。該平滑度としては、トナーが無い白色から最大濃度の黒色までの全領域において、算術平均粗さ（Ｒａ）は３μｍ以下が好ましく、１μｍ以下がより好ましく、０．５μｍ以下が更に好ましい。
なお、前記算術平均粗さは、ＪＩＳ Ｂ０６０１、ＪＩＳ Ｂ０６５１、ＪＩＳ Ｂ０６５２に基づいて測定することができる。
【０１４１】
前記トナー受像層は、以下の項目の内の１項目の物性を有することが好ましく、更に好ましくは、複数の項目、最も好ましくは、全ての項目の物性を有することが適当である。
（１）トナー受像層のＴｍ（溶融温度）は３０℃以上が好ましく、トナーのＴｍ＋２０℃以下がより好ましい。
（２）トナー受像層の粘度が１×１０^５ｃｐになる温度が、４０℃以上が好ましく、トナーのそれより低いことがより好ましい。
（３）トナー受像層の定着温度における貯蔵弾性率（Ｇ'）が、１×１０^２〜１×１０^５Ｐａが好ましい。損失弾性率（Ｇ”）が、１×１０²〜１×１０^５Ｐａが好ましい。
（４）トナー受像層の定着温度における損失弾性率（Ｇ”）と、貯蔵弾性率（Ｇ'）との比である損失正接（Ｇ”／Ｇ'）は、０．０１〜１０が好ましい。
（５）トナー受像層の定着温度における貯蔵弾性率（Ｇ'）は、トナーの定着温度における貯蔵弾性率（Ｇ”）に対して、−５０〜＋２５００が好ましい。
（６）溶融トナーのトナー受像層上の傾斜角は、５０度以下が好ましく、４０度以下がより好ましい。
また、トナー受像層としては、特許第２７８８３５８号明細書、特開平７−２４８６３７号公報、同８−３０５０６７号公報、同１０−２３９８８９号公報等に開示されている物性等を満足するものが好ましい。
【０１４２】
前記トナー受像層としては、１×１０^６〜１×１０^１５Ω／ｃｍ^２の範囲（２５℃、６５％ＲＨの条件にて）の表面電気抵抗を有するのが好ましい。
前記表面抵抗が、１×１０^６Ω／ｃｍ^２未満であると、トナー受像層にトナーが転写される際のトナー量が充分でなく、得られるトナー画像の濃度が低くなり易いことがあり、１×１０^１５Ω／ｃｍ^２を超えると、転写時に必要以上の電荷が発生し、トナーが充分に転写されず、画像の濃度が低く、電子写真用受像シートの取り扱い中に静電気を帯びて塵埃が付着し易くなることがある。また、複写時にミスフィード、重送、放電マーク、トナー転写ヌケ等が発生することがある。
【０１４３】
尚、前記支持体に対し、トナー受像層と反対側の面の表面電気抵抗としては、５×１０^８〜３．２×１０^１０Ω／ｃｍ^２が好ましく、１×１０^９〜１×１０^１０Ω／ｃｍ^２がより好ましい。
ここで、前記表面電気抵抗の測定は、ＪＩＳ Ｋ６９１１に準拠し、サンプルを温度２０℃、湿度６５％の環境下に８時間以上調湿し、同じ環境下で、アドバンテスト（株）製Ｒ８３４０を使用し、印加電圧１００Ｖの条件で、通電して１分間経過した後に測定することができる。
【０１４４】
−その他の層−
前記その他の層としては、例えば、表面保護層、バック層、中間層、密着改良層、下塗り層、クッション層、帯電調節（防止）層、反射層、色味調製層、保存性改良層、接着防止層、アンチカール層、及び、平滑化層等が挙げられる。これらの層は、単層構成であってもよく、２以上の層より構成されていてもよい。
【０１４５】
前記表面保護層は、前記電子写真用受像シートにおける表面の保護、保存性の改良、取り扱い性の改良、筆記性の付与、機器通過性の改良、アンチオフセット性の付与等の目的で、前記トナー受像層の表面に設けることができる。該表面保護層は、１層であってもよいし、２層以上の層からなっていてもよい。表面保護層には、バインダーとして各種の熱可塑性樹脂、熱硬化性樹脂等を用いることができ、前記トナー受像層と同種の樹脂を用いるのが好ましい。但し、熱力学的特性や、静電特性等は、トナー受像層と同じである必要はなく、各々最適化することができる。
【０１４６】
前記表面保護層には、トナー受像層に使用可能な、前述の各種の添加剤を配合することができる。特に、前記表面保護層には、本発明で使用する離型剤と共に、他の添加剤、例えば、マット剤等を配合することができる。なお、前記マット剤としては、種々の公知のものが挙げられる。
前記電子写真用受像シートにおける最表面層（例えば、表面保護層が形成されている場合には、表面保護層等）としては、定着性の点で、トナーとの相溶性が良いのが好ましい。具体的には、溶融したトナーとの接触角が、例えば０〜４０度が好ましい。
【０１４７】
前記バック層は、前記電子写真用受像シートにおいて、裏面出力適性付与、裏面出力画質改良、カールバランス改良、機器通過性改良等の目的で、支持体に対して、トナー受像層の反対側に設けられるのが好ましい。
前記バック層の色としては、特に制限はないが、前記電子写真用受像シートが、裏面にも画像を形成する両面出力型受像紙の場合、バック層も白色であることが好ましい。白色度及び分光反射率は、表面と同様に８５％以上が好ましい。
また、両面出力適性改良のため、バック層の構成がトナー受像層側と同様であってもよい。バック層には、上記で説明した各種の添加剤を用いることができる。このような添加剤として、特にマット剤や、帯電調整剤等を配合することが適当である。バック層は、単層構成であってもよく、２層以上の積層構成であってもよい。
また、定着時のオフセット防止のため、定着ローラ等に離型性オイルを用いている場合、バック層は、オイル吸収性としてもよい。
【０１４８】
前記密着改良層は、前記電子写真用受像紙において、支持体及びトナー受像層の密着性を改良する目的で、形成するのが好ましい。密着改良層には、前述の各種の添加剤を配合することができ、特に架橋剤を配合するのが好ましい。また、前記電子写真用受像シートには、トナーの受容性を改良するため、該密着改良層及びトナー受像層の間に、更にクッション層等を設けるのが好ましい。
【０１４９】
前記中間層は、例えば、支持体及び密着改良層の間、密着改良層及びクッション層の間、クッション層及びトナー受像層の間、トナー受像層及び保存性改良層との間等に形成することができる。もちろん、支持体、トナー受像層、及び、中間層からなる電子写真用受像シートの場合には、中間層は、例えば、支持体及びトナー受像層の間に存在させることができる。
【０１５０】
〔トナー〕
前記電子写真材料は、印刷又は複写の際に、トナー受像層にトナーを受容させて使用される。
前記トナーは、結着樹脂と着色剤とを少なくとも含有し、必要に応じて離型剤、その他の成分を含有する。
【０１５１】
−トナー 結着樹脂−
前記結着樹脂としては、スチレン、パラクロルスチレンなどのスチレン類；ビニルナフタレン、塩化ビニル、臭化ビニル、弗化ビニル、酢酸ビニル、プロピオン酸ビニル、ベンゾエ酸ビニル、酪酸ビニルなどのビニルエステル類；アクリル酸メチル、アクリル酸エチル、アクリル酸ｎ−ブチル、アクリル酸イソブチル、アクリル酸ドデシル、アクリル酸ｎ−オクチル、アクリル酸２−クロルエチル、アクリル酸フェニル、α−クロルアクリル酸メチル、メタクリル酸メチル、メタクリル酸エチル、メタクリル酸ブチルなどのメチレン脂肪族カルボン酸エステル類；アクリロニトリル、メタクリルロニトリル、アクリルアミドなどのビニルニトリル類；ビニルメチルエーテル、ビニルエチルエーテル、ビニルイソブチルエーテルなどのビニルエーテル類；Ｎ−ビニルピロール、Ｎ−ビニルカルバゾール、Ｎ−ビニルインドール、Ｎ−ビニルピロリドンなどのＮ−ビニル化合物類；メタクリル酸、アクリル酸、桂皮酸などのビニルカルボン酸類などビニル系モノマーの単独重合体やその共重合体、更には各種ポリエステル類を使用することができ、各種ワックス類を併用することも可能である。
これらの樹脂の中で、特に前記トナー受像層に用いたものと同一系統の樹脂を用いるのが好ましい。
【０１５２】
−トナー 着色剤−
前記着色剤としては、通常トナーに用いられているものを制限なく使用することができ、例えば、カーボンブラック、クロムイエロー、ハンザイエロー、ベンジジンイエロー、スレンイエロー、キノリンイエロー、パーメネントオレンジＧＴＲ、ピラゾロンオレンジ、バルカンオレンジ、ウオッチヤングレッド、パーマネントレッド、ブリリアンカーミン３Ｂ、ブリリアンカーミン６Ｂ、デイポンオイルレッド、ピラゾロンレッド、リソールレッド、ローダミンＢレーキ、レーキレッドＣ、ローズベンガル、アニリンブルー、ウルトラマリンブルー、カルコオイルブルー、メチレンブルークロライド、フタロシアニンブルー、フタロシアニングリーン、マラカイトグリーンオクサレレートなどの種々の顔料が挙げられる。また、アクリジン系、キサンテン系、アゾ系、ベンゾキノン系、アジン系、アントラキノン系、チオインジコ系、ジオキサジン系、チアジン系、アゾメチン系、インジコ系、チオインジコ系、フタロシアニン系、アニリンブラック系、ポリメチン系、トリフェニルメタン系、ジフェニルメタン系、チアジン系、チアゾール系、キサンテン系などの各種染料などが挙げられる。これら着色剤は１種単独で使用してもよいし、複数種類を併せて使用してもよい。
前記着色剤の含有量は、２〜８質量％の範囲が好ましい。前記着色剤の含有量が２質量％以上であれば着色力が弱くなることもなく、一方、８質量％以下であれば、透明性が損なわれることもないので好ましい。
【０１５３】
−トナー 離型剤−
前記離型剤としては、原理的には、公知のワックス全てが使用可能であるが、比較的低分子量の高結晶性ポリエチレンワックス、フィッシャートロプシュワックス、アミドワックス、ウレタン化合物など窒素を含有する極性ワックスなどが特に有効である。ポリエチレンワックスについては分子量１０００以下が好ましく、３００〜１０００の範囲がより好ましい。
【０１５４】
前記ウレタン結合を有する化合物は、低分子量であっても極性基による凝集力の強さにより、固体状態を保ち、融点も分子量のわりには高く設定できるので好適である。分子量の好ましい範囲は３００〜１０００である。原料は、ジイソシアン酸化合物類とモノアルコール類との組み合わせ、モノイソシアン酸とモノアルコールとの組み合わせ、ジアルコール類とモノイソシアン酸との組み合わせ、トリアルコール類とモノイソシアン酸との組み合わせ、トリイソシアン酸化合物類とモノアルコール類との組み合わせなど、種々の組み合わせを選択することができが、高分子量化させないために、多官能基と単官能基の化合物を組み合わせることが好ましく、また等価の官能基量となるようにすることが重要である。
【０１５５】
具体的な、原料化合物のうちモノイソシアン酸化合物としては、例えば、イソシアン酸ドデシル、イソシアン酸フェニル及びその誘導体、イソシアン酸ナフチル、イソシアン酸ヘキシル、イソシアン酸ベンジル、イソシアン酸ブチル、イソシアン酸アリルなどが挙げられる。
ジイソシアン酸化合物としては、ジイソシアン酸トリレン、ジイソシアン酸４、４’ジフェニルメタン、ジイソシアン酸トルエン、ジイソシアン酸１、３−フェニレン、ジイソシアン酸ヘキサメチレン、ジイソシアン酸４−メチル−ｍ−フェニレン、ジイソシアン酸イソホロンなどが挙げられる。
モノアルコールとしては、メタノール、エタノール、プロパノール、ブタノール、ペンタノール、ヘキサノール、ヘプタノールなど極く一般的なアルコール類を使用することが可能である。
原料化合物のうちジアルコール類としては、エチレングリコール、ジエチレングリコール、トリエチレングリコール、トリメチレングリコールなど多数のグリコール類；トリアルコール類としては、トリメチロールプロパン、トリエチロールプロパン、トリメタノールエタンなどが使用可能であるが、必ずしもこの範囲に限定されない。
【０１５６】
これらのウレタン化合物類は、通常の離型剤のように、混練時に樹脂や着色剤とともに混合して、混練粉砕型トナーとしても使用できる。また、前記の乳化重合凝集溶融法トナーに用いる場合には、水中にイオン性界面活性剤や高分子酸や高分子塩基などの高分子電解質とともに分散し、融点以上に加熱してホモジナイザーや圧力吐出型分散機で強い剪断をかけて微粒子化し、１μｍ以下の離型剤粒子分散液を調製し、樹脂粒子分散液、着色剤分散液などとともに用いることができる。
【０１５７】
−トナー その他の成分−
また、本発明のトナーには、内添剤、帯電制御剤、無機微粒子等のその他の成分を配合することができる。内添剤としては、フェライト、マグネタイト、還元鉄、コバルト、ニッケル、マンガン等の金属、合金、又はこれら金属を含む化合物などの磁性体を使用することができる。
【０１５８】
前記帯電制御剤としては、４級アンモニウム塩化合物、ニグロシン系化合物、アルミや、鉄、クロムなどの錯体からなる染料、トリフェニルメタン系顔料など通常使用される種々の帯電制御剤を使用することができる。なお、凝集、溶融時の安定性に影響するイオン強度の制御や、廃水汚染を減少する観点から水に溶解しにくい材料が好ましい。
【０１５９】
前記無機微粒子としては、例えば、シリカ、アルミナ、チタニア、炭酸カルシウム、炭酸マグネシウム、リン酸三カルシウムなど、通常、トナー表面の外添剤を全て使用で、それらをイオン性界面活性剤や高分子酸、高分子塩基で分散して使用することが好ましい。
【０１６０】
更に、乳化重合、シード重合、顔料分散、樹脂粒子分散、離型分散、凝集、更には、それらの安定化などに界面活性剤を用いることができる。例えば、硫酸エステル塩系、スルホン酸塩系、リン酸エステル系、せっけん系等のアニオン界面活性剤、アミン塩型、４級アンモニウム塩型等のカチオン系界面活性剤、また、ポリエチレングリコール系、アルキルフェノールエチレンオキサイド付加物系、多価アルコール系等の非イオン性界面活性剤を併用することも効果的である。その際の分散手段としては、回転せん断型ホモジナイザーやメデイアを有するボールミル、サンドミル、ダイノミルなどの一般的なものが使用可能である。
【０１６１】
なお、前記トナーには、必要に応じて更に外添剤を添加してもよい。前記外添剤としては、無機粉末及び有機粒子等が挙げられる。前記無機粒子としては、ＳｉＯ_２、ＴｉＯ_２、Ａｌ_２Ｏ_３、ＣｕＯ、ＺｎＯ、ＳｎＯ_２、Ｆｅ_２Ｏ_３、ＭｇＯ、ＢａＯ、ＣａＯ、Ｋ_２Ｏ、Ｎａ_２Ｏ、ＺｒＯ_２、ＣａＯ・ＳｉＯ_２、Ｋ_２Ｏ・（ＴｉＯ_２）_ｎ、Ａｌ_２Ｏ_３・２ＳｉＯ_２、ＣａＣＯ_３、ＭｇＣＯ_３、ＢａＳＯ_４、ＭｇＳＯ_４等を例示することができる。また、前記有機粒子としては、脂肪酸又はその誘導体や、これ等の金属塩等の粉末、フッ素系樹脂、ポリエチレン樹脂、アクリル樹脂等の樹脂粉末を用いることができる。これらの粉末の平均粒径は、例えば、０．０１〜５μｍが好ましく、０．１〜２μｍがより好ましい。
【０１６２】
前記トナーの製造方法は、特に制限されないが、（ｉ）樹脂粒子を分散させてなる分散液中で凝集粒子を形成し凝集粒子分散液を調製する工程、（ｉｉ）前記凝集粒子分散液中に、微粒子を分散させてなる微粒子分散液を添加混合して前記凝集粒子に前記微粒子を付着させて付着粒子を形成する工程、及び（ｉｉｉ）前記付着粒子を加熱し融合してトナー粒子を形成する工程、とを含むトナーの製造方法により得られるものが好ましい。
【０１６３】
−トナー物性等−
本発明のトナーの体積平均粒子径は、０．５μｍ以上１０μｍ以下が好ましい。
前記トナーの体積平均粒子径が小さすぎると、トナーのハンドリング（補給性、クリーニング性、流動性等）に悪影響が生じる場合があり、また、粒子生産性が低下する場合がある。一方、トナーの体積平均粒子径が大すぎると、粒状性、転写性に起因する画質、解像度に悪影響を与える場合がある。
また、本発明のトナーは、前記トナーの体積平均粒子径範囲を満たし、かつ体積平均粒度分布指数（ＧＳＤｖ）は、１．３以下が好ましい。
前記体積平均粒度分布指数（ＧＳＤｖ）と数平均粒度分布指数（ＧＳＤｎ）との比（ＧＳＤｖ／ＧＳＤｎ）は、０．９５以上が好ましい。
また、本発明のトナーは、前記トナーの体積平均粒子径範囲を満たし、かつ下記式で表される形状係数の平均値は１．００〜１．５０が好ましい。
形状係数＝（π×Ｌ^２）／（４×Ｓ）
ただし、前記式中、Ｌは、トナー粒子の最大長を表す。Ｓは、トナー粒子の投影面積を表す。
トナーが上記条件を満たす場合には、画質、特に、粒状性、解像度に効果があり、また、転写に伴う抜けやブラーが生じにくく、平均粒径が小さくなくてもハンドリング性に悪影響が出にくくなる。
【０１６４】
なお、トナー自体の１５０℃における貯蔵弾性率Ｇ'（角周波数１０ｒａｄ／ｓｅｃで測定）は、１０〜２００Ｐａであることが、定着工程での画質向上とオフセット性の防止の面から適当である。
【０１６５】
＜銀塩写真材料＞
前記銀塩写真材料としては、例えば、前記本発明の支持体上に、少なくともＹＭＣに発色する画像形成層を設けた構成を有し、焼付露光されたハロゲン化銀写真用シートを複数の処理槽内を浸漬しながら通過することにより、発色現像、漂白定着、水洗を行い、乾燥するハロゲン化銀写真方式、等が挙げられる。
【０１６６】
＜インクジェット記録用材料＞
前記インクジェット記録用材料としては、例えば、本発明の画像記録材料用支持体上に、水性インク（色材として染料又は顔料を用いたもの）及び油性インク等の液状インクや、常温では固体であり、溶融液状化させて印画に供する固体状インク等を受容できる前記色材受容層を有する。
【０１６７】
＜熱転写材料＞
前記熱転写材料としては、例えば、本発明の前記画像記録材料用支持体上に、少なくとも画像形成層としての熱溶融性インク層を設けた構成を有し、感熱ヘッドにより加熱して熱溶融性インク層からインクを熱転写シート上に溶融転写する方式などが挙げられる。
【０１６８】
＜感熱材料＞
前記感熱材料としては、例えば、本発明の前記画像記録材料用支持体上に、少なくとも熱発色層を設けた構成を有し、感熱ヘッドによる加熱と紫外線による定着の繰り返しにより画像を形成するサーモオートクローム方式（ＴＡ方式）において用いられる感熱材料等が挙げられる。
【０１６９】
＜昇華転写材料＞
前記昇華転写材料としては、例えば、本発明の前記画像記録材料用支持体上に、少なくとも熱拡散性色素（昇華性色素）を含有するインク層を設けた構成を有し、感熱ヘッドにより加熱してインク層から熱拡散性色素を昇華転写シート上に転写する昇華転写方式などが挙げられる。
【０１７０】
＜印刷用紙＞
前記画像記録材料用支持体は、印刷用紙として用いることも好ましい。印刷用紙として用いる場合には、印刷機械によりインク等を塗布する点から、機械強度が高いものが好ましい。
【０１７１】
前記基紙として原紙を用いる場合、紙に填料、柔軟剤、製紙用内添助剤等を含有させるのが好ましい。填料としては、一般に使用されているものが使用でき、例えば、クレー、焼成クレー、珪藻土、タルク、カオリン、焼成カオリン、デラミカオリン、重質炭酸カルシウム、軽質炭酸カルシウム、炭酸マグネシウム、炭酸バリウム、二酸化チタン、酸化亜鉛、酸化ケイ素、非晶質シリカ、水酸化アルミニウム、水酸化カルシウム、水酸化マグネシウム、水酸化亜鉛等の無機填料、尿素−ホルマリン樹脂、ポリスチレン樹脂、フェノール樹脂、微小中空粒子等の有機填料、などが挙げられる。これらは、１種単独で使用してもよく、２種以上を併用してもよい。
【０１７２】
前記製紙用内添助剤としては、例えば、従来から使用されている各種のノニオン性、カチオン性、アニオン性の歩留まり向上剤、濾水度向上剤、紙力向上剤、内添サイズ剤等が挙げられる。具体的には、硫酸バンド、塩化アルミニウム、アルミン酸ソーダ、塩基性塩化アルミニウム、塩基性ポリ水酸化アルミニウム等の塩基性アルミニウム化合物；硫酸第一鉄、硫酸第二鉄等の多価金属化合物、澱粉、加工澱粉、ポリアクリルアミド、尿素樹脂、メラミン樹脂、エポキシ樹脂、ポリアミド樹脂、ポリアミン樹脂、ポリアミン、ポリエチレンイミン、植物ガム、ポリビニルアルコール、ラテックス、ポリエチレンオキサイド等の水溶性高分子、親水性架橋ポリマー粒子分散物及びこれらの誘導体或いは変成物等の各種化合物が例示でき、これらの物質は前記製紙用内添助剤としての機能のいくつかを同時に有するものである。
【０１７３】
次に、内添サイズ剤としての機能が著しいものとしては、アルキルケテンダイマー系化合物、アルケニル無水コハク酸系化合物、スチレン−アクリル系化合物、高級脂肪酸系化合物、石油樹脂系サイズ剤やロジン系サイズ剤が挙げられる。
【０１７４】
更に、染料、蛍光増白剤、ｐＨ調整剤、消泡剤、ピッチコントロール剤、スライムコントロール剤等の抄紙用内添剤を用途に応じて適宜添加してもよい。
【０１７５】
前記印刷用紙は、オフセット印刷用紙として特に好適であり、その他にも凸版印刷用紙、グラビア印刷用紙、電子写真用紙として使用することが可能である。
【０１７６】
【実施例】
以下、本発明の実施例について説明するが、本発明はこれらの実施例に何ら限定されるものではない。
【０１７７】
（実施例１）
広葉樹晒クラフトパルプ（ＬＢＫＰ）をディスクリファイナーで３００ｍｌ（カナダ標準ろ水度、Ｃ．Ｓ．Ｆ．）まで叩解し、繊維長０．５８ｍｍのパルプ紙料を作製した。このパルプ紙料にパルプ質量を基準として、カチオン澱粉１．２質量％、アルキルケテンダイマー（ＡＫＤ）０．５質量％、アニオンポリアクリルアミド０．３質量％、エポキシ化脂肪酸アミド（ＥＦＡ）０．２質量％、及びポリアミドポリアミンエピクロルヒドリン０．３質量％の割合となるように添加した。なお、前記ＡＫＤは、アルキルケテンダイマー（アルキル部分は、ベヘン酸を主体とする脂肪酸に由来する）を意味する。前記ＥＦＡは、エポキシ化脂肪酸アミド（脂肪酸部分は、ベヘン酸を主体とする脂肪酸に由来する）を意味する。
【０１７８】
得られたパルプ紙料を長網式抄紙機により坪量１５０ｇ／ｍ^２の原紙を作製した。前記長網式抄紙機の速度は４００ｍ／ｍｉｎであり、Ｊ／Ｗ比は０．９８であった。
抄紙機のワイヤーは、振幅が２５ｍｍのシェーキングを行った。
抄紙機の後半では５５メッシュのワイヤーを有するダンデーロールを使用した。
長網式抄紙機の乾燥ゾーンの中間でサイズプレス装置により、原紙の両面に固形成分で０．５ｇ／ｍ^２となるように、ポリビニルアルコール（ＰＶＡ）を塗布し、乾燥した。
抄紙工程の最後において、原紙の表面（画像形成層を設ける側の面）が、金属ロール（表面温度１１０℃）と接触し、原紙の裏側が、金属ロール（表面温度４０℃）と接触するように、マシンカレンダー装置を配置し、ニップ圧１５０ｋＮ／ｍ（１５３ｋｇｆ／ｃｍ）でマシンカレンダリング処理を行った。
【０１７９】
次に、前記マシンカレンダリング処理後、原紙表面（画像形成層を設ける側の面）が、金属ロール（表面温度２１０℃）と接触し、原紙の裏面側が、ウレタン樹脂製のロール（表面温度４０℃）と接触するように、ソフトカレンダー装置を配置し、ニップ圧、２１０ｋＮ／ｍ（２１４ｋｇｆ／ｃｍ）でソフトカレンダー処理を行った。
【０１８０】
得られた原紙について、以下のようにして、地合指数（絞り１．０ｍｍ）、地合指数の変化量、密度、及び密度の変化量を測定した。結果を表１に示す。
−地合指数−
地合指数の測定は、下記測定条件に基づき、Ｍ／Ｋｓｙｓｔｅｍ社製の「３−Ｄシートアナライザー」を使用して測定した。原紙３枚について地合指数を測定し、その平均値で示した。なお、前記地合指数はその値が大きいほど、地合がよいことを示す。
〔測定条件〕
測定面積 ：１０ｃｍ×１０ｃｍ
測定ポイント数：６５５３６ポイント
絞りの直径 ：１．０ｍｍ
【０１８１】
−地合指数の変化量−
原紙の画像形成層を設ける側の表面に、水を２０℃にて３０秒間接触させた前後における地合指数（絞り１．０ｍｍ）を上記同様に測定し、地合指数の変化量（接触前の地合指数−接触後の地合指数）を求めた。
【０１８２】
−密度−
原紙の密度を、坪量（ＪＩＳ−Ｐ８１２４）／厚さ（ＪＩＳ Ｐ８１１８）により求めた。なお、原紙３枚について密度を測定し、その平均値で示した。
【０１８３】
−密度の変化量−
原紙の画像形成層を設ける側の表面に、水を２０℃にて３０秒間接触させた前後における密度を上記同様に測定し、密度の変化量（接触前の密度−接触後の密度）を求めた。
【０１８４】
（実施例２〜５及び比較例１〜４）
抄紙工程における各種条件を、下記表１，２に示すように変更した以外は、実施例１と同様にして、実施例２〜５及び比較例１〜４の各原紙を作製した。
得られた各原紙について、実施例１と同様にして密度及び地合指数を測定した。結果を表１，２に示す。
【０１８５】
【表１】
パルプ原料及び原紙の物性

【０１８６】
【表２】
抄紙工程における各設定条件

【０１８７】
（実施例６〜１０及び比較例５〜８）
実施例１〜５及び比較例１〜４の各原紙を用いて、下記方法により実施例６〜１０及び比較例５〜８の各電子写真用受像紙を作製した。
−二酸化チタン分散液−
二酸化チタン（タイペーク（登録商標）Ａ−２２０、石原産業製）４０．０ｇ、ＰＶＡ１０２（クラレ（株）製）２．０ｇ、及びイオン交換水５８．０ｇを混合し、日本精機製作所製ＮＢＫ−２を用いて分散させて二酸化チタン分散液（二酸化チタン顔料含有量が４０質量％）を作製した。
【０１８８】
−トナー受像層用塗布液の調製−
前記二酸化チタン分散液１５．５ｇ、カルナバワックス分散液（セロゾール５２４、中京油脂（株）製）１５．０ｇ、ポリエステル樹脂水分散物（固形分３０質量％、ＫＺＡ−７０４９、ユニチカ製）１００．０ｇ、増粘剤(アルコックスＥ３０、明成化学製)２．０ｇ、アニオン界面活性剤（ＡＯＴ）０．５ｇ、及びイオン交換水８０ｍｌを混合し、攪拌してトナー受像層用塗布液を調製した。
得られたトナー受像層用塗布液の粘度は、４０ｍＰａ・ｓであり、表面張力は３４ｍＮ／ｍであった。
【０１８９】
−バック層用塗布液の調製−
下記の成分を混合し、攪拌して、バック層用の塗布液を調製した。
アクリル樹脂水分散物(固形分３０質量％、ハイロスＸＢＨ−９９７Ｌ、星光化学製)１００．０ｇ、マット剤（テクポマーＭＢＸ−１２、積水化成品工業（株）製）５．０ｇ、離型剤(ハイドリンＤ３３７、中京油脂（株）製)１０．０ｇ、増粘剤（ＣＭＣ）２．０ｇ、アニオン界面活性剤（ＡＯＴ）０．５ｇ、及びイオン交換水８０ｍｌを混合し、撹拌してバック層用塗布液を調製した。
得られたバック層用塗布液の粘度は、３５ｍＰａ・ｓであり、表面張力は、３３ｍＮ／ｍであった。
【０１９０】
−バック層及びトナー受像層の塗工−
前記実施例１〜５及び比較例１〜４の各原紙における裏面（トナー受像層を設けない側の表面）に、前記バック層用塗布液をバーコーターで乾燥質量が９ｇ／ｍ^２となるように塗布し、バック層を形成した。
また、前記各原紙の表面に、前記トナー受像層用塗布液を、バーコーターで乾燥質量が１２ｇ／ｍ^２となるように塗布し、トナー受像層を形成した。なお、トナー受像層中の顔料の含有量は、熱可塑性樹脂に対して５質量％であった。
【０１９１】
前記バック層及び前記トナー受像層は、塗布した後、オンラインで熱風により乾燥した。前記乾燥は、バック層及びトナー受像層ともに塗布後２分以内に乾燥するように、乾燥風量及び温度を調整した。なお、乾燥点は、塗布表面温度が乾燥風の湿球温度と同じ温度となる点とした。
次いで、乾燥後、カレンダー処理を行った。前記カレンダー処理は、グロスカレンダーを用い、金属ローラを４０℃に保温した状態で、ニップ圧１４．７ｋＮ／ｍ（１５ｋｇｆ／ｃｍ）の条件で行った。
【０１９２】
得られた各電子写真用受像紙をＡ４に裁断し、電子写真用プリンターを用いて画像をプリントした。使用したプリンターは、定着部を図１に示すベルト定着装置１とした富士ゼロックス（株）製カラーレーザープリンター（ＤｏｃｕＣｏｌｏｒ １２５０−ＰＦ）を用いた。
即ち、図１に示すベルト定着装置１では、加熱ローラ３と、テンションローラ５とにわたって定着ベルト２が懸架され、テンションローラ５には、その上方で、定着ベルト２を介して、クリーニングローラ６が設けられ、更に、加熱ローラ３の下方には、定着ベルト２を介して、加圧ローラ４が設けられている。トナー潜像を有する電子写真用受像紙は、図１において、右側から、加熱ローラ３と、加圧ローラ４との間に挿入され、定着され、次いで、定着ベルト２に載って移動し、その過程で、冷却装置７によって冷却され、最後に、クリーニングローラ６で清浄化される。
前記ベルト定着装置１においては、定着ベルト２の搬送速度は、３０ｍｍ／秒であり、加熱ローラ３と加圧ローラ４との間のニップ圧力は、０．２ＭＰａ（２ｋｇｆ／ｃｍ^２）であり、加熱ローラ３の設定温度は、１５０℃であり、これが定着温度に相当する。なお、加圧ローラ４の設定温度は、１２０℃に設定した。
【０１９３】
得られた各電子写真プリントについて、以下のようにして、画質及び光沢性を評価した。結果を表３に示す。
【０１９４】
＜画質＞
各電子写真プリントの画質を目視で観察し、下記基準に基づいて、画質の最も良好なものをＡとして、次いで、Ｂ、Ｃ、Ｄ、Ｅとランク付けし、評価した。
〔評価基準〕
Ａ・・・非常に優れている（高画質記録材料として有効）。
Ｂ・・・優れている（高画質記録材料として有効）。
Ｃ・・・中間である（高画質記録材料として不可）。
Ｄ・・・劣る（高画質記録材料として不可）。
Ｅ・・・非常に劣る（高画質記録材料として不可）。
【０１９５】
＜光沢性＞
各電子写真プリントの光沢性を目視で観察し、下記基準に基づいて、光沢の最も良好なものをＡとして、次いで、Ｂ、Ｃ、Ｄ、Ｅとランク付けし、評価した。
〔評価基準〕
Ａ・・・非常に優れている（高画質記録材料として有効）。
Ｂ・・・優れている（高画質記録材料として有効）。
Ｃ・・・中間である（高画質記録材料として不可）。
Ｄ・・・劣る（高画質記録材料として不可）。
Ｅ・・・非常に劣る（高画質記録材料として不可）。
【０１９６】
【表３】

【０１９７】
表３の結果から、実施例１〜５の画像記録材料用支持体を用いた実施例６〜１０の電子写真用受像紙は、比較例５〜８に比べて光沢性及び画質に優れていることが認められた。
【０１９８】
（実施例１１〜１５及び比較例９〜１２）
−電子写真用受像紙−
実施例１〜５及び比較例１〜４で得た各原紙の画像形成層を設ける側の面（表面）に、固形分で、アクリルエマルジョン（ガラス転移温度（Ｔｇ）＝６０℃）４０質量部、ワックスエマルジョン１０質量部、ＣａＣＯ_３ ４０質量部、酸化デンプン１０質量部、及び適量の水を混合した水系ポリマー塗布液をゲートロールコーターを用いて、固形分で４ｇ／ｍ^２となるように塗布し、乾燥させて、各水系ポリマー塗布支持体を作製した。
【０１９９】
実施例６〜１０及び比較例５〜８において、実施例１〜５及び比較例１〜４の各原紙の代わりに前記各水系ポリマー塗布支持体を用いた以外は、実施例６〜１０及び比較例５〜８と同様にして、実施例１１〜１５及び比較例９〜１２の各電子写真用受像紙を作製した。
【０２００】
得られた各電子写真用受像紙について、上記実施例６〜１０及び比較例５〜８と同様にして、画質及び光沢性を評価した。結果を表４に示す。
【０２０１】
【表４】

【０２０２】
（実施例１６〜２０及び比較例１３〜１６）
−写真印画紙−
実施例１〜５及び比較例１〜４で作製した各原紙の画像形成層を設ける側の面（表面）にＴｉＯ_２を１０質量％含有するＬＤＰＥを厚みが２５μｍになるように押出コーティングした。一方、各原紙の画像形成層を設ける側の面（裏面）に、ＬＤＰＥ／ＨＤＰＥ＝１／１（質量比）のポリエチレン（ＰＥ）を厚みが２０μｍとなるように押出コーティングして、両面ポリエチレン樹脂被覆支持体を作製した。該両面ポリエチレン樹脂被覆支持体の表面（ＬＤＰＥ面側）にコロナ放電処理を行い、ゼラチンを０．１ｇ／ｍ^２塗布し、各印画紙用支持体を作製した。
【０２０３】
得られた各印画紙用支持体のゼラチン塗布面に、イエロー発色カラー写真用ハロゲン化銀ゼラチン乳剤層（１０ｇ／ｍ^２）、ゼラチン中間層、マゼンタ発色カラー写真用ハロゲン化銀ゼラチン乳剤層（１０ｇ／ｍ^２）、ゼラチン中間層、シアン発色カラー写真用ハロゲン化銀ゼラチン乳剤層（１０ｇ／ｍ^２）、ゼラチン保護層をこの順に重層塗布し、実施例１６〜２０及び比較例１３〜１６の各写真印画紙を作製した。
【０２０４】
得られた各写真印画紙を露光、現像処理し、写真プリントを得た。各写真プリントの画面の表面平滑性（微小凹凸（１ｍｍ以下））、及び表面平滑性（うねり凹凸（５〜６ｍｍ））を下記方法により評価した。結果を表５に示す。
【０２０５】
＜表面平滑性（微小凹凸（１ｍｍ以下）＞
各写真プリントを目視で観察し、下記基準に基づいて、表面平滑性（微小凹凸（１ｍｍ以下）の最も良好なものをＡとして、次いで、Ｂ、Ｃ、Ｄ、Ｅとランク付けし、評価した。
〔評価基準〕
Ａ・・・非常に優れている（高画質記録材料として有効）。
Ｂ・・・優れている（高画質記録材料として有効）。
Ｃ・・・中間である（高画質記録材料として不可）。
Ｄ・・・劣る（高画質記録材料として不可）。
Ｅ・・・非常に劣る（高画質記録材料として不可）。
【０２０６】
＜表面平滑性（うねり凹凸（５〜６ｍｍ）＞
各写真プリントを目視で観察し、下記基準に基づいて、表面平滑性（うねり凹凸（５〜６ｍｍ）の最も良好なものをＡとして、次いで、Ｂ、Ｃ、Ｄ、Ｅとランク付けし、評価した。
〔評価基準〕
Ａ・・・非常に優れている（高画質記録材料として有効）。
Ｂ・・・優れている（高画質記録材料として有効）。
Ｃ・・・中間である（高画質記録材料として不可）。
Ｄ・・・劣る（高画質記録材料として不可）。
Ｅ・・・非常に劣る（高画質記録材料として不可）。
【０２０７】
【表５】

【０２０８】
表５の結果から、実施例１〜５の原紙を有する画像記録材料用支持体を用いた実施例１６〜２０の写真印画紙は、比較例１３〜１６に比べて微小凹凸及びうねり凹凸がいずれも小さく、表面平滑性に優れていることが認められた。
【０２０９】
【発明の効果】
本発明によると、従来における問題を解決することができ、極めて平滑性に優れ、かつ、銀塩写真と同レベルの高画質な画像を形成できる画像記録材料用支持体を提供することができる。
【図面の簡単な説明】
【図１】図１は、実施例で使用したプリンターにおけるベルト定着装置の概要構成図である。
【符号の説明】
１ ベルト定着装置
２ 定着ベルト
３ 加熱ローラ
４ 加圧ローラ
５ テンションローラ
６ クリーニングローラ
７ 冷却装置[0001]
BACKGROUND OF THE INVENTION
The present invention provides a support for an image recording material that is extremely excellent in smoothness and can form a high-quality image equivalent to a silver salt photograph, a method for producing the support for an image recording material, and the image The present invention relates to an image recording material using a recording material support.
[0002]
[Prior art]
Conventionally, in order to form an image with excellent smoothness and high image quality, attempts have been made to adjust the density and formation index of the support for image recording materials. For example, in order to improve the color mixing blur and density unevenness after printing, the apparent density is 0.80 to 0.90 g / cm.³Ink jet recording paper having a formation index of 20 or more has been proposed (see Patent Document 1). In addition, in order to improve the paper passing property, the appearance of the printed matter after printing, and the image quality of the printed surface, the transfer sheet for electrophotography in which the density of the transfer sheet for electrophotography is reduced and the formation index is adjusted to 25 or more is provided. It has been proposed (see Patent Document 2).
[0003]
However, in this case, in any recording material with the formation index adjusted, in order to sufficiently improve the flatness, the density of the recording material must be increased, and the same high image quality as that of silver halide photography. In order to obtain a good image, it is necessary to make the formation index extremely high, and at present, a support for an image recording material and an image recording material having sufficiently satisfactory performance have not yet been provided.
[0004]
[Patent Document 1]
JP-A-8-11424
[Patent Document 2]
Japanese Patent Laid-Open No. 2000-39736
[0005]
[Problems to be solved by the invention]
This invention is made | formed in view of this present condition, and makes it a subject to solve the said various problems in the past and to achieve the following objectives. That is, the present invention is an image recording material support that is extremely excellent in smoothness and capable of forming a high-quality image at the same level as a silver salt photograph, a method for producing the image recording material support, and An object of the present invention is to provide an image recording material using the support for image recording material.
[0006]
[Means for Solving the Problems]
  Means for solving the problems are as follows. That is,
  <1> In a support for image recording material including at least a base paper,
  The formation index (aperture 1.0 mm) of the base paper is 80 or more.And the density of the base paper is 0.95 g / cm ³ That's it,
  Soft calender treatment is performed so that a metal roll having a surface temperature of 140 ° C. or higher is in contact with the image forming layer side of the base paper.This is a support for an image recording material.
  <2> Change in formation index (diaphragm 1.0 mm) before and after contact with water at 20 ° C. for 30 seconds on the surface of the support on which the image forming layer is provided (geometry index before contact−contact) The support for image recording materials according to <1>, wherein the subsequent formation index is 10 or less.
  <3>  The density change amount (density before contact−density after contact) before and after contact with water at 20 ° C. for 30 seconds on the surface of the support on which the image forming layer is provided is 0.05 g / cm.³IsAny one of <1> to <2>The support for an image recording material described in 1.
  <4>  The base paper is made using a paper machine having a shake with an amplitude of 10 mm or more.Any one of <1> to <3>The support for an image recording material described in 1.
  <5>  The base paper is made using a paper machine having a dandy roll with a 40-100 mesh wire.Any one of <1> to <4>The support for an image recording material described in 1.
  <6> The image recording material support according to any one of <1> to <5>, wherein the base paper is made with a J / W ratio of 0.9 to 1.0.
  <7> The base paper is a pulp stock having a weight average fiber length of 0.45 to 0.65 mm, and the surface temperature is200 ℃ or higherThe support for an image recording material according to any one of <1> to <6>, wherein paper making is performed using a paper machine having a calendar provided with a metal roll.
  <8> From the above <1> to <7, wherein at least one selected from a water repellent, a sizing agent, a water resistant agent and a surface treatment agent is applied or impregnated on at least the surface of the base paper on which the image forming layer is provided. The support for image recording materials according to any one of the above.
  <9> The image recording material support according to any one of <1> to <8>, wherein at least one surface of the base paper is coated with a coating solution containing an aqueous polymer.
  <10> The support for image recording materials according to any one of <1> to <9>, wherein at least one surface of the base paper is coated with a polyolefin resin.
  <11>A method for producing the image recording material support according to any one of <1> to <10>,
  At least a paper making process for making a base paper by making pulp paper stock, wherein in the paper making process, (1) a shaking process using a shake having an amplitude of 10 mm or more, (2) a dandy roll having a 40-100 mesh wire A method for producing a support for an image recording material, comprising performing at least one selected from a dandy roll treatment to be used and (3) a calendar treatment using a calendar having a metal roll having a surface temperature of 140 ° C. or higher. .
  <12> The method for producing a support for an image recording material according to <11>, wherein at least one of a shaking process, a dandy roll process, and a calendar process is performed using a long net paper machine.
  <13> An image recording material comprising at least an image recording material support according to any one of <1> to <10> and an image forming layer provided on the support.
  <14> The image recording material according to <13>, wherein the image recording material is at least one selected from electrophotographic materials, heat-sensitive materials, inkjet recording materials, sublimation transfer materials, silver salt photographic materials, and thermal transfer materials.
[0007]
The image recording material support of the present invention is an image recording material support containing at least a base paper, and the formation index (aperture 1.0 mm) of the base paper is 80 or more. Further, the change in the formation index (diaphragm 1.0 mm) before and after contact with water at 20 ° C. for 30 seconds on the surface on the image forming layer side of the support (the formation index before contact−after contact) The formation index) is preferably 10 or less. As a result, it is possible to form a high-quality image having excellent smoothness and the same level as a silver salt photograph.
[0008]
The method for producing a support for an image recording material according to the present invention is a method for producing a support for an image recording material comprising at least a paper making process for producing a base paper by making a pulp stock. In the paper making process, (1 ) Shaking treatment using a shake having an amplitude of 10 mm or more, (2) Dandy roll treatment using a dandy roll having a 40-100 mesh wire, and (3) Calendar using a calendar having a metal roll having a surface temperature of 140 ° C. or more. At least one process selected from the processes is performed. In the method for producing a support for an image recording material of the present invention, at least one of a shaking process, a dandy roll process, and a calendar process is performed in the paper making process. As a result, it is possible to efficiently produce a support for an image recording material that is extremely excellent in smoothness and capable of forming a high-quality image at the same level as a silver salt photograph.
[0009]
The image recording material of the present invention has at least the support for image recording material of the present invention and an image forming layer provided on the support. The image recording material of the present invention is extremely excellent in smoothness and can form high-quality images of the same level as silver salt photographs, and in particular, electrophotographic materials, heat-sensitive materials, ink jet recording materials, and sublimation transfer materials. It is suitable for any one selected from silver salt photographic materials and thermal transfer materials.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
(Support for image recording)
The image recording material support of the present invention is an image recording material support including at least a base paper, and the formation index (aperture 1.0 mm) of the base paper is 80 or more, and includes other layers as necessary. .
[0011]
The formation index (diaphragm 1.0 mm) of the base paper for the image recording material support needs to be 80 or more, preferably 100 or more. The upper limit value of the formation index is not particularly limited and cannot be appropriately selected according to the purpose, but is preferably 120 or less.
When the formation index (aperture 1.0 mm) is less than 80, the smoothness of the support becomes insufficient, and a high-quality image at the same level as a silver salt photograph may not be obtained.
Change amount of formation index (diaphragm 1.0 mm) before and after contact with water at 20 ° C. for 30 seconds on the surface of the image recording material support on which the image forming layer is provided (geometry index before contact) The formation index after contact is preferably 10 or less, more preferably 7 or less.
When the amount of change in the formation index exceeds 10, the planarity of the support may be insufficient.
[0012]
Here, the formation index can be measured using a “3-D sheet analyzer” manufactured by M / Ksystem under the following conditions. The formation index is measured for the three base papers and expressed as an average value. In addition, the said formation index shows that a formation is so good that the value is large, and when the said formation index becomes high, it means that the mass distribution width of paper becomes narrow and it is a more uniform base paper.
〔Measurement condition〕
Measurement area: 10cm x 10cm
Number of measurement points: 65536 points
Diaphragm diameter: 1.0 mm
The formation index (diaphragm 0.5 mm) measured with the diameter of the diaphragm being 0.5 mm is preferably 50 or more, and more preferably 80 or more.
[0013]
As a specific method for measuring the formation index, first, a sample is mounted on a rotating drum of a 3-D sheet analyzer, a light source mounted on the drum shaft, and a photodetector outside the drum arranged to face the light source. The local basis weight difference in the sample is measured as the light amount difference. The range to be measured at this time is defined by the diameter of the diaphragm attached to the light incident part of the photodetector. Next, the light amount difference (deviation) is amplified, A / D converted, classified into 64 photometric basis weight classes, 65,536 data are taken in one scan, and a histogram for the data is obtained. Get the frequency. Then, the highest frequency (peak value) of the histogram is divided by the number of classes having a frequency of 100 or more out of those classified into classes corresponding to a micro basis weight of 64, and the value obtained by dividing it by 1/100 is the ground value. Calculated as a combined index.
[0014]
The density of the base paper in the image recording material support is 0.95 g / cm.³Or more, preferably 1.00 g / cm³The above is more preferable. The density is 0.95 g / cm.³If it is less than 1, smoothness may not be sufficiently improved.
[0015]
Further, the support for image recording material has a density before and after contact with water at 20 ° C. for 30 seconds on the surface of the support on which the image forming layer is provided after satisfying the density range of the base paper. The amount of change (density before contact-density after contact) is 0.05 g / cm³The following is preferred.
The density change amount is 0.05 g / cm.³If it exceeds 1, the planarity of the support may be insufficient.
[0016]
In order to improve the smoothness and form a high-quality image, the base paper is preferably made using a paper machine having a shake with an amplitude of 10 mm or more. The amplitude is more preferably 15 mm or more.
In order to improve the smoothness and form a high-quality image, the base paper is preferably made using a paper machine having a dandy roll having a 40 to 100 mesh wire.
In addition, the base paper uses a pulp paper material having a weight average fiber length of 0.45 to 0.65 mm and a surface temperature of 140 ° C. or higher in order to improve smoothness and form a high-quality image. It is preferable to make paper using a paper machine having a calendar equipped with
In order to improve the smoothness and form a high-quality image, the base paper may be referred to as a slurry jet speed / wire speed ratio (hereinafter referred to as “J / W ratio”) in a papermaking process using a long net paper machine. Is preferably 0.9 to 1.0, more preferably 0.95 to 1.05.
Further, in the paper making process, it is preferable to perform shaking using a paper machine having a shake having an amplitude of 10 mm or more as a wire. Furthermore, it is preferable to use a paper machine having a dandy roll having a 40-100 mesh wire in the latter half of the paper making process.
[0017]
Examples of the base paper include high-quality paper, papers described in Japanese Photographic Society, “Basics of Photographic Engineering—Silver Salt Photo Edition”, Corona Publishing Co., Ltd. (Showa 54) (223) to (240), etc. Are mentioned as preferred.
[0018]
The pulp that can be used as the raw material of the base paper is hardwood bleached kraft pulp (LBKP) from the viewpoint of improving the surface smoothness, rigidity and dimensional stability (curling property) of the base paper to a balanced and sufficient level at the same time. Although desirable, softwood bleached kraft pulp (NBKP), hardwood sulfite pulp (LBSP) and the like can also be used.
As the pulp fiber, it is appropriate to mainly use hardwood pulp having a short fiber length.
A beater or refiner can be used for beating the pulp.
[0019]
The Canadian standard freeness of the base paper is 200 to 440 ml C.I. S. F. Is preferred, 250-380 ml C.I. S. F. Is more preferable.
In the pulp slurry obtained after beating the pulp (hereinafter sometimes referred to as “pulp paper material”), various additives such as a filler, a dry paper strength enhancer, a sizing agent, and wet paper are used as necessary. A force enhancer, a fixing agent, a pH adjuster, other agents, and the like can be added.
[0020]
Examples of the filler include calcium carbonate, clay, kaolin, white clay, talc, titanium oxide, diatomaceous earth, barium sulfate, aluminum hydroxide, and magnesium hydroxide.
Examples of the dry paper strength enhancer include cationized starch, cationized polyacrylamide, anionized polyacrylamide, amphoteric polyacrylamide, and carboxy-modified polyvinyl alcohol.
Examples of the sizing agent include fatty acid salts, rosin derivatives such as rosin and maleated rosin, paraffin wax, alkyl ketene dimer, alkenyl succinic anhydride (ASA), compounds containing higher fatty acids such as epoxidized fatty acid amide, etc. Is mentioned.
Examples of the wet paper strength enhancer include polyamine polyamide epichlorohydrin, melamine resin, urea resin, and epoxidized polyamide resin. Examples of the fixing agent include polyvalent metal salts such as aluminum sulfate and aluminum chloride, and cationic polymers such as cationized starch.
Examples of the pH adjuster include caustic soda and sodium carbonate.
As said other chemical | medical agent, an antifoamer, dye, a slime control agent, a fluorescent whitening agent, etc. are mentioned, for example.
Furthermore, a softening agent etc. can also be added as needed. The softening agent is described in, for example, New Paper Processing Handbook (edited by Paper Medicine Time), pages 554 to 555 (issued in 1980).
[0021]
The treatment liquid used for the surface sizing treatment may contain, for example, a water-soluble polymer compound, a water-resistant substance, a pigment, a dye, and the like.
Examples of the water-soluble polymer compound include cationized starch, polyvinyl alcohol, carboxy-modified polyvinyl alcohol, carboxymethyl cellulose, hydroxyethyl cellulose, cellulose sulfate, gelatin, casein, sodium polyacrylate, styrene-maleic anhydride copolymer sodium. Examples thereof include salts and sodium polystyrene sulfonate.
Examples of the water-resistant substance include styrene-butadiene copolymer, ethylene-vinyl acetate copolymer, polyethylene, vinylidene chloride copolymer, polyamide polyamine epichlorohydrin, and the like.
Examples of the pigment include calcium carbonate, clay, kaolin, talc, barium sulfate, and titanium oxide.
[0022]
As the base paper, for example, when used for an electrophotographic image-receiving sheet, the longitudinal Young's modulus (Ea) is considered to improve the rigidity and dimensional stability (curling property) of the electrophotographic image-receiving sheet. The ratio (Ea / Eb) to the transverse Young's modulus (Eb) is preferably in the range of 1.5 to 2.0. When the ratio (Ea / Eb) is out of the above range, the rigidity and curl property of the electrophotographic image-receiving sheet are liable to be deteriorated, which may hinder the running property during conveyance.
[0023]
In general, it is known that the “strain” of paper differs based on the difference in the mode of beating, and after the beating, the elasticity (rate) of the paper made by papermaking represents the degree of “strain” of the paper. Can be used as an additional factor. In particular, the elastic modulus of paper is measured by measuring the speed of sound propagating through the paper, using the relationship between the dynamic elastic modulus and density, which indicates the physical properties of the viscoelastic material of the paper, and using an ultrasonic vibration element. Can be obtained from the following equation.
E = ρc²(1-n²)
However, E expresses a dynamic elastic modulus in the said numerical formula. ρ represents density. c represents the speed of sound in the paper. n represents a Poisson's ratio.
[0024]
In the case of normal paper, since n = about 0.2, even if it is calculated by the following formula, it can be calculated without much difference.
E = ρc²
That is, if the density and sound speed of the paper can be measured, the elastic modulus can be easily obtained. In the above mathematical formula, when measuring the speed of sound, various known devices such as Sonic Tester SST-110 (manufactured by Nomura Corporation) can be used.
[0025]
In order to impart a desired centerline average roughness to the surface of the base paper, for example, the fiber length distribution (for example, the total of 24 mesh screen residue and 42 mesh screen residue is, for example, 20 to 45 mass. % And a 24 mesh screen residue is preferably 5% by mass or less) (refer to JP-A-58-68037). Further, the center line average roughness can be adjusted by applying heat and pressure to the surface with a machine calendar, a super calendar, or the like.
[0026]
There is no restriction | limiting in particular in the thickness of the said base paper, Although it can select suitably according to the objective, 30-500 micrometers is preferable, 50-300 micrometers is more preferable, 100-250 micrometers is still more preferable. The basis weight of the base paper is 50 to 250 g / m²Is preferable, 100-200 g / m²Is more preferable.
[0027]
A base paper having a high glossiness can be prepared, for example, by subjecting the surface of the base paper on which an image forming layer is provided (hereinafter sometimes referred to as “surface”) to high-temperature soft calendering.
For example, a surface with a glossiness of 25% or more can be formed by performing a soft calender treatment so that the surface of the base paper is in contact with the surface of the high-temperature metal roll. The surface temperature of the metal roll is preferably 140 ° C. or higher, more preferably 200 ° C. or higher, and still more preferably 250 ° C. or higher. There is no restriction | limiting in particular in the upper limit temperature of the surface temperature of the said metal roll, Although it can select suitably according to the objective, For example, about 300 degreeC is preferable.
Conventionally, even if soft calendering has been performed on the base paper surface before coating, the surface temperature of the metal roll is at most about 90 ° C., and such a relatively low temperature metal surface was used. In the calendar process, the glossiness of the surface of the base paper is, for example, about 12%.
[0028]
As the metal surface, for example, the surface of a metal roll can be used. Such a calendar treatment using a metal surface can be performed, for example, by using a pair of calendar rolls in which at least one roll is a metal roll.
Examples of such a calender roll include a soft calender roll composed of a combination of a metal roll and a synthetic resin roll, and a machine calender roll composed of a pair of metal rolls. Among these, a soft calender roll is suitable, and a long nip shoe calender composed of a metal roll and a shoe roll with a synthetic resin belt can take a long nip width of 50 to 270 mm. This is preferable because the contact area increases.
These calendar processes can be used alone or in combination.
The nip pressure when the base paper is soft calendered is preferably 100 kN / m or more, more preferably 100 to 600 kN / m.
[0029]
In the present invention, it is preferable to impregnate or apply a water repellent, a sizing agent, and a water-proofing agent to the surface of the base paper on which the image forming layer is formed.
Examples of the water repellent include silicone compounds, modified silicones, cured silicones, carbowaxes, and the like.
Examples of the sizing agent include fatty acid salts, rosin derivatives such as rosin and maleated rosin, paraffin wax and the like, and further higher fatty acids such as alkyl ketene dimer, alkenyl succinic anhydride (ASA), and epoxidized fatty acid amide. Among them, alkyl ketene dimers and epoxidized fatty acid amides are particularly preferable.
There is no restriction | limiting in particular in the addition amount of the said sizing agent, According to the objective, it can select suitably, 0.3 mass% or more is preferable with respect to the pulp mass of a base paper, and 0.5 mass% is more preferable.
Examples of the water-proofing agent include latex / emulsions such as styrene-butadiene copolymer, ethylene-vinyl acetate copolymer, polyethylene, vinylidene chloride copolymer, and polyamide polyamine epichlorohydrin.
A method for applying or impregnating the surface of the base paper with a water repellent, a sizing agent, and a water-proofing agent is not particularly limited and may be appropriately selected depending on the intended purpose. For example, a horizontal size press, a size bath, a gate Examples thereof include a roll coater, a film transfer coater, a rod coater, a bill blade coater, a spray coater, an air knife coater, and a curtain coater. Among these, a gate roll coater and a curtain coater are preferable.
[0030]
-Support coated with water-based polymer-
There is no restriction | limiting in particular as a water-system polymer, Although it can select suitably according to the objective, Either an emulsion and latex are suitable.
[0031]
Examples of the emulsion include hydrocarbon waxes such as paraffin wax and microcrystalline wax; oxygen-containing waxes such as carnauba wax and montan wax oxidized paraffin; petroleum resins, coumarone indene resins, terpene resins, and carboxylic acid adducts thereof. And other emulsions such as alkyl ketene dimers and epoxidized fatty acid amides. Among these, a soap-free emulsion is particularly preferable.
[0032]
As the soap-free emulsion, either an acrylic soap-free emulsion or a polyolefin soap-free emulsion is suitable.
Examples of the acrylic soap-free emulsion include copolymers of acrylic acid ester homopolymers, acrylic acid esters and methacrylic acid esters, vinyl acetate, styrene, acrylonitrile and acrylic acid. Examples of the polyolefin soap-free emulsion include ethylene vinyl acetate copolymer emulsion, ethylene acrylic acid copolymer, and ionomer.
[0033]
The aqueous medium is preferably composed mainly of water or a water-soluble organic solvent added to water. Examples of the water-soluble organic solvent include ethylene glycol, propylene glycol, butylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol (average molecular weight of about 190 to 400), glycerin, alkyl ethers of the above glycols, and N-methylpyrrolidone. 1,3-dimethylimidazolinone, thiodiglycol, 2-pyrrolidone, sulfolane, dimethyl sulfoxide, diethanolamine, triethanolamine, ethanol, isopropanol, and the like.
[0034]
If necessary, the soap-free emulsion coating solution may further include, for example, a matting agent, a pigment, a plasticizer, a release agent, a lubricant, a thickener, an antistatic agent, a fluorescent whitening agent, a color adjusting dye, These various additives can be arbitrarily blended.
[0035]
Examples of the latex include various latexes such as SBR, MBR, and PVdc. Among these, a soap-free latex is particularly preferable. As the soap-free latex, core / shell type latex particles obtained by an emulsion polymerization method not using an emulsifier (surfactant) are suitable (for example, “Synthesis / design of acrylic resin and development of new applications” (Chubu). Management Development Center Publishing Department, issued July 1, 1985) 279-281).
Examples of the method for producing the soap-free latex include a seed method, a reactive emulsifier method, and an oligomer method.
The seed method is a method in which a water-dispersible polymer is prepared in advance, a monomer is added as a seed polymer, and polymerization is performed.
In the seed method, usually, a seed polymer forms a core part, and a polymerized polymer forms a shell part according to polymerization of a monomer to form a core / shell structure.
[0036]
The reactive emulsifier method is a method in which a compound (reactive emulsifier) having an ethylenically unsaturated bond and an anionic or nonionic hydrophilic group in the molecule is used in the same manner as a conventional emulsifier. However, the reactive emulsifier used is taken into the polymer to be produced and does not remain as an emulsifier.
As the reactive emulsifier, various reactive emulsifiers are known, and acrylic acid derivatives (JP 55-11252, JP 56-28208, etc.) and itaconic acid derivatives (JP 51-51). -30284, etc.), maleic acid derivatives (JP 51-30284, JP 56-29657 etc.), fumaric acid derivatives (JP 51-30285, JP 51-30284). Publication etc.).
Specifically, as a seed polymer suitable for producing the core / shell type latex resin composition, a seed polymer prepared by any of an emulsion polymerization method, a suspension polymerization method and a dispersion polymerization method is used. can do. Among these, it is appropriate to use a seed polymer prepared by an emulsion polymerization method. Even if an emulsifier is used in the emulsion polymerization method, the amount of the emulsifier can be greatly reduced by the separation and purification process. Further, even if the seed polymer contains an emulsifier, the seed polymer is taken into the core / shell structure and does not exist on the surface of the core / shell structure, so that it is hardly affected by humidity. For the seed polymer prepared by the suspension polymerization method or the dispersion polymerization method, a complicated process for removing the dispersant, the solvent and the like is required.
Specifically, the seed polymer is preferably a water-soluble polymer, such as polyacrylate or a copolymer thereof, gelatin, tragacanth gum, starch, methyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, polyvinyl alcohol, polyvinyl Pyrrolidone and the like can be used.
[0037]
In the seed method, as the monomer to be added in the presence of the seed polymer, various ethylenically unsaturated monomers can be used as long as they can be radically polymerized. In this case, the monomer may be the same as or different from the monomer used to produce the seed polymer.
[0038]
Examples of the monomer include (meth) acrylic acid ester monomers, monovinyl aromatic monomers, (meth) vinyl ester monomers, vinyl ether monomers, monoolefin monomers, diolefin monomers, halogenated olefin monomers, polyvinyl Preferable examples include system monomers.
[0039]
Examples of the (meth) acrylic monomer include (meth) acrylic acid, methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, (meth) acrylate-2-ethylhexyl, ( Cyclohexyl methacrylate, phenyl (meth) acrylate, methyl (meth) acrylate, ethyl β-hydroxyacrylate, propyl γ-aminoacrylate, stearyl methacrylate, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, or And a mixture thereof.
Examples of the vinyl aromatic monomer include styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, p-methoxystyrene, p-phenylstyrene, p-chlorostyrene, p-ethylstyrene, p- Butylstyrene, pt-butylstyrene, p-hexylstyrene, p-octylstyrene, p-nonylstyrene, p-decylstyrene, p-dodecylstyrene, 2,4-dimethylstyrene, 3,4-dichlorostyrene, etc. Or a derivative thereof, or a mixture thereof.
[0040]
Examples of the vinyl ester monomers include vinyl acetate, vinyl propionate, vinyl benzoate, and the like.
Examples of the vinyl ether monomer include vinyl methyl ether, vinyl ethyl ether, vinyl isobutyl ether, vinyl phenyl ether, and the like.
Examples of the olefin monomer include monoolefin monomers such as ethylene, propylene, isobutylene, 1-butene, 1-pentene, and 4-methyl-1-pentene, and diolefin monomers such as butadiene, isoprene, and chloroprene. Can be mentioned.
Furthermore, a crosslinkable monomer may be added to improve the properties of the seed polymer. Examples of the crosslinkable monomer include those having two or more unsaturated bonds such as divinylbenzene, divinylnaphthalene, divinyl ether, diethylene glycol methacrylate, ethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, and diallyl phthalate.
[0041]
In the seed method, a radical polymerization initiator can be used. The radical polymerization initiator can be appropriately used as long as it is water-soluble. Examples of such a polymerization initiator include persulfates (potassium persulfate, ammonium persulfate, etc.), azo compounds (4,4′-azobis-4-cyanovaleric acid or salts thereof, 2,2′-azobis ( 2-amidinopropane) salts), peroxide compounds, and the like.
[0042]
Furthermore, the said polymerization initiator is good also as a redox-type initiator combining with a reducing agent as needed. By using the redox initiator, the polymerization activity increases, the polymerization temperature can be lowered, and the polymerization time can be expected to be shortened.
The polymerization temperature may be any temperature as long as it is equal to or higher than the lowest radical generation temperature of the polymerization initiator. For example, a range of 50 to 80 ° C. is usually used. However, it is also possible to polymerize at room temperature or lower by using a polymerization initiator that starts at room temperature, for example, a combination of hydrogen peroxide and a reducing agent (ascorbic acid or the like).
[0043]
In the core / shell type latex particles, the number average molecular weight [(Mn (c)) of the core is preferably 30,000 to 500,000, and more preferably 40000 to 400,000.
On the other hand, the number average molecular weight [Mn (s)] of the shell is preferably 4000 to 30000, and more preferably 5000 to 20000.
[0044]
In the core / shell type latex particles, the mass ratio of the core to the shell is preferably 10:90 to 90:10, and more preferably 20:80 to 80:20. If the mass ratio of the core to the shell is out of this range, it is difficult to sufficiently exhibit the characteristics of the core / shell structure, and the characteristics are close to those of a simple continuous film.
The average particle size of the core / shell type latex particles is preferably 0.2 μm or less, and more preferably 0.1 μm or less. In addition, the minimum of an average particle diameter is about 0.04 micrometer, for example. When the average particle diameter exceeds 0.2 μm, the characteristics of the core / shell structure cannot be utilized.
[0045]
If necessary, the soap-free latex coating solution may further include, for example, matting agents, pigments, plasticizers, release agents, lubricants, thickeners, antistatic agents, fluorescent whitening agents, and color-adjusting dyes. These various additives can be arbitrarily blended.
[0046]
The glass transition temperature (Tg) of the resin in either the soap-free latex or the soap-free emulsion is preferably 30 ° C. or higher, more preferably 50 ° C. or higher. The amount of the soap-free latex and soap-free emulsion applied to or impregnated into the base paper is 0.5 to 10 g / m in solid content.²1-5 g / m²Is more preferable.
[0047]
-Support coated with polymer-
The image recording material support is preferably one in which at least one surface of the base paper is coated with a polymer because it is excellent in smoothness and can improve image quality.
There is no restriction | limiting in particular as said polymer, According to the objective, it can select suitably, For example, polyolefin resin etc. are mentioned.
[0048]
For the polyolefin resin layer, polyolefin resins such as α-olefin homopolymers such as polyethylene and polypropylene, and mixtures thereof are usually used. These polyolefin resins are not particularly limited in molecular weight as long as extrusion coating is possible, but polyolefin resins having a molecular weight in the range of 20,000 to 200,000 are usually used.
[0049]
The polyethylene resin may be any one of high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (L-LDPE), etc., and cutting when cutting to a specified size with a cutter or the like in the cutting process The melt index is preferably 5 to 30 g / 10 min in that the surface is uniform and beautiful.
The melt index is 10 to 20 g / 10 min, and the density is 0.945 g / cm.³40 to 75 parts by mass of the above high-density polyethylene, the melt index is 1 to 15 g / 10 min (preferably 2 to 10 g / 10 min), and the density is 0.930 g / cm.^ThreeIt is preferable to use a polyethylene resin mixture obtained by mixing the following low-density polyethylene with 25 to 60 parts by mass.
These may be used alone or in combination of two or more.
[0050]
The mixing mass ratio (HDPE / LDPE) of the high density polyethylene and the low density polyethylene is preferably 40 to 75/60 to 25, and more preferably 50 to 70/50 to 30. The support having a polyolefin resin layer coated with a polyethylene mixture in which the high-density polyethylene is 75 parts by mass or more and the low-density polyethylene is less than 25 parts by mass has sufficient cutting characteristics (uniform cutting) On the other hand, the support having a polyolefin resin layer coated with a polyethylene mixture in which the high-density polyethylene is less than 40 parts by mass and the low-density polyethylene is 60 parts by mass or more. In this case, sufficient cutting characteristics (uniform cut surface) can be obtained, but the surface is partially melted by a heating roll at the time of fixing, which causes deterioration of surface properties or occurrence of jamming failure due to poor running. It is not preferable.
[0051]
When a polyolefin resin layer is provided on both sides of the base paper, it is preferable to coat a polyolefin resin layer made of a polyethylene mixture having the above composition on both sides. The polyolefin-based resin layer may contain an antistatic agent such as a surfactant or a metal oxide in order to adjust the surface electrical resistance, and the polyolefin-based resin layer and the conductive layer containing them. You may use as a layer which served as.
[0052]
With respect to the polyolefin resin layer, from the viewpoint of improving the image quality, when the polyolefin resin layer is a single layer, the polyolefin resin layer is included in the polyolefin resin layer. In at least one layer, an inorganic pigment such as titanium dioxide, a bluing agent, a fluorescent brightening agent, an antioxidant, and the like may be contained, and it is particularly preferable to contain titanium dioxide. In the case where the polyolefin resin layer is a multilayer, the lowermost layer in contact with the base paper may contain a tackifier resin, an adhesive resin, or the like from the viewpoint of improving the adhesion to the base paper. Further, if necessary, an antioxidant, a release agent, a hollow polymer and the like may be contained.
[0053]
When the titanium dioxide is contained in the polyolefin resin layer, the form thereof may be anatase type or rutile type, but when priority is given to whiteness, the anatase type is preferred, and the sharpness In the case where priority is given, the rutile type is preferred. In consideration of both whiteness and sharpness, anatase type and rutile type may be blended and used, or two polyolefin resin layers containing titanium dioxide may be used, and one layer may be anatase type dioxide. Titanium may be contained, and the other layer may contain rutile titanium dioxide.
[0054]
The average particle diameter of the titanium dioxide is preferably 0.1 to 0.4 μm. When the average particle size is less than 0.1 μm, it may be difficult to uniformly mix and disperse in the polyolefin resin layer, and when it exceeds 0.4 μm, sufficient whiteness cannot be obtained. Protrusions are generated on the surface of the polyolefin resin layer, which may adversely affect image quality.
[0055]
The titanium dioxide preferably has a particle surface treated with a silane coupling agent, and the silane coupling agent preferably has an end modified with ethoxy or methoxy. 0.05-2.5 mass% is preferable with respect to the said titanium dioxide, and, as for the processing amount of the said silane coupling agent, 0.5-2.0 mass% is more preferable. When the treatment amount of the silane coupling agent is less than 0.05% by mass, the surface treatment effect by the silane coupling agent may not be sufficient, and when it exceeds 2.5% by mass, it is excessive with respect to titanium dioxide. It may become processing.
[0056]
In order to suppress the activity of the titanium dioxide pigment, the surface of the titanium dioxide is preferably subjected to a surface treatment with an inorganic surface treatment agent before the surface treatment of the silane coupling agent. Examples of the inorganic surface treatment agent include Al.₂O₃, SiO₂Is preferred. The treatment amount (calculated in the form of an anhydride) of the inorganic surface treatment agent is preferably 0.01 to 1.8% by mass, more preferably 0.2 to 1.0% by mass with respect to titanium dioxide.
[0057]
If the surface of the titanium dioxide is not subjected to an inorganic surface treatment, the heat resistance of the titanium dioxide is low, and the titanium dioxide may turn yellow when used in an extrusion laminate at around 320 ° C. Further, since the activity of titanium dioxide is not suppressed, the titanium dioxide particles are aggregated and caught in a metal filter net equivalent to 20 to 400 mesh which is generally provided in the vicinity of the extrusion laminate outlet to prevent extrusion of foreign matter. May cause an increase in pressure.
[0058]
On the other hand, when the treatment amount of the inorganic surface treatment agent is 1.8% by mass or more with respect to titanium dioxide, moisture easily adheres to the surface of the inorganic surface treatment agent, and when used for extrusion lamination, the growth of die lip stains is remarkably accelerated.
[0059]
The titanium dioxide is kneaded using a metal salt of a higher fatty acid, a higher fatty acid ethyl, a higher fatty acid amide, a higher fatty acid, a polyolefin wax or the like as a dispersion aid, such as a two-roll, three-roll, kneader, Banbury mixer, continuous kneading, etc. And kneaded into the resin. As the dispersion aid, metal stearate is preferable, and zinc stearate is more preferable. The resin thus kneaded with the titanium dioxide pigment is formed into a pellet shape and used as a master batch of the titanium dioxide pigment.
[0060]
As a titanium dioxide density | concentration in the said pellet, 30-75 mass% is preferable. If the titanium dioxide concentration is less than 30% by mass, the pellet mass may increase, and if it exceeds 75% by mass, the dispersibility of the titanium dioxide may deteriorate or the pellet may easily crack. is there.
The concentration of the dispersion aid in the pellet is preferably 0.5 to 10% by mass. Moreover, it is preferable to dry dry or vacuum dry the masterbatch containing the said titanium dioxide at 50-90 degreeC for 2 hours or more before use.
[0061]
5-50 mass% is preferable and, as for content of the said titanium dioxide in the said polyolefin resin layer, 8-45 mass% is more preferable. If the content is less than 5% by mass, the resolution may be inferior, and if it exceeds 50% by mass, die streaks may occur during production.
[0062]
Examples of the bluing agent include commonly known ultramarine blue, cobalt blue, cobalt oxide phosphate, quinacridone pigments, and the like, and mixtures thereof. The particle size of the bluing agent is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 0.3 to 10 μm. When the bluing agent is used in the uppermost layer of the polyolefin resin layer, it is preferable to contain 0.2 to 0.4% by mass. Moreover, when using for the lower layer side, it is preferable to make it contain 0-0.15 mass%.
[0063]
The content of the antioxidant in the polyolefin resin layer is preferably about 50 to 1,000 ppm with respect to the resin forming the polyolefin resin layer. The master batch containing the titanium dioxide pigment and the like thus prepared is appropriately diluted with the resin forming the polyolefin resin layer and used for extrusion lamination.
[0064]
Examples of the tackifier resin include rosin derivative resins, terpene resins (for example, polymer β-pinene), coumarone / indene resins, petroleum hydrocarbon resins, and the like. These may be used alone or in combination of two or more.
[0065]
Examples of the petroleum hydrocarbon resins include aliphatic petroleum resins, aromatic petroleum resins, dicyclopentadiene petroleum resins, copolymer petroleum resins, hydrogenated petroleum resins, and alicyclic petroleum resins. Can be mentioned. The aliphatic petroleum resin preferably has 5 or more carbon atoms. As said aromatic petroleum resin, a C9 or more thing is preferable.
[0066]
As a compounding quantity of the said tackifier resin, 0.5-60 mass% is preferable normally with respect to resin which forms the said polyolefin resin layer, and 10-35 mass% is more preferable. When the blending amount of the tackifier resin is less than 0.5% by mass, adhesion failure may occur, and when it exceeds 60% by mass, neck-in during production may easily occur.
[0067]
Examples of the adhesive resin include ionomer, ethylene vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer, and metal salts thereof. 20-500 mass parts is preferable with respect to 100 mass parts of resin which forms the said polyolefin resin layer, and, as for the compounding quantity of the said adhesive resin, 50-200 mass parts is more preferable. The tackifier resin and the adhesive resin may be used in combination.
[0068]
The polyolefin-based resin layer is prepared by melting pellets containing the titanium dioxide and the like that are heated and melted, and if necessary diluted and melted with a resin that forms the polyolefin resin layer. It is formed by coating by any one of a laminating method, a sequential laminating method, or a laminating method using a single block or multi-layer extrusion die such as a foot block type, a multi-manifold type, a multi-slot type, or a laminator. There is no restriction | limiting in particular as a shape of the die | dye for the said single layer or multilayer extrusion, According to the objective, it can select suitably, For example, a T die, a coat hanger die, etc. are mentioned suitably.
[0069]
Before coating one or both surfaces of the base paper with the resin forming the polyolefin resin layer, the base paper may be subjected to an activation treatment such as a corona discharge treatment, a flame treatment, a glow discharge treatment, or a plasma treatment. preferable.
[0070]
As for the thickness of the polyolefin resin layer formed in the side (surface) which provides the image forming layer of the said support body, 10-60 micrometers is preferable. The thickness of the polyolefin resin layer formed on the side of the support on which the image forming layer is not formed (back surface) is preferably 10 to 50 μm.
[0071]
On the surface of the polyolefin resin layer on the side (surface) on which the image forming layer is provided in the support, there is a glossy surface, or a fine surface, a mat surface or a silk surface described in JP-A-55-26507. Then, the surface of the polyolefin resin layer on the side (back surface) where the image forming layer is not formed is molded with a matte surface. Further, these surfaces after being molded can be subjected to an activation treatment such as a corona discharge treatment or a flame treatment, and after the activation treatment, a subbing treatment can be carried out by a known method.
[0072]
In the polyethylene mixture used for the polyolefin resin layer, there is no particular limitation on the method for mixing the high-density polyethylene and the low-density polyethylene, and any method can be used. For example, using a kneader extruder, a heated kneading roll, a Banbury mixer, a kneader, etc., a predetermined amount of high-density polyethylene and low-density polyethylene, and if necessary, various additives are melted and mixed, and then the mixture It is possible to use a method of pulverizing or pelletizing the powder, or a method of directly coating it into an extruder in a so-called simply blended state and performing extrusion coating.
[0073]
(Method for producing support for image recording material)
The method for producing a support for an image recording material of the present invention includes a papermaking process for producing a base paper by making a pulp stock, and in the papermaking process, (1) a shaking process using a shake having an amplitude of 10 mm or more. , (2) at least one selected from a dandy roll treatment with a dandy roll having a 40 to 100 mesh wire, and (3) a calendar treatment using a metal roll having a surface temperature of 140 ° C. or higher. .
In this case, it is preferable that at least one of the shaking process, the dandy roll process, and the calendar process is performed by a long net paper machine.
The shaking process, the dandy roll process, and the calendar process are preferably performed under the conditions described above.
[0074]
(Image recording material)
The image recording material of the present invention has at least a support and an image forming layer provided on the support, and the support is the support for an image recording material of the present invention.
The image recording material varies depending on the use and type of the image recording material, and examples thereof include an electrophotographic material, a heat sensitive material, an ink jet recording material, a sublimation transfer material, a silver salt photographic material, and a thermal transfer material.
[0075]
<Electrophotographic materials>
The electrophotographic material has the support for image recording material of the present invention and at least one toner image-receiving layer provided on at least one surface of the support, and other layers appropriately selected as necessary, For example, surface protection layer, intermediate layer, undercoat layer, cushion layer, charge control (prevention) layer, reflection layer, tint preparation layer, storage stability improvement layer, adhesion prevention layer, anti-curl layer, smoothing layer, etc. It becomes. Each of these layers may have a single layer structure or a laminated structure.
[0076]
[Toner image receiving layer]
The toner image receiving layer is a toner image receiving layer for receiving color or black toner and forming an image. The toner image receiving layer receives a toner for forming an image from a developing drum or an intermediate transfer body by (static) electricity, pressure, etc. in a transfer process, and fixes it by heat, pressure, etc. in a fixing process. Have
[0077]
The toner image-receiving layer has a light transmittance of preferably 78% or less, more preferably 73% or less, and even more preferably 72% or less, from the viewpoint that the electrophotographic material has a photographic feel.
Here, the light transmittance can be measured by separately forming a coating film having the same thickness on a polyethylene terephthalate film (100 μm) and using the direct reading haze meter (Suga Test Instruments HGM-2DP). it can.
[0078]
The material of the toner image-receiving layer contains at least a thermoplastic resin and, if necessary, other components.
[0079]
-Thermoplastic resin-
The thermoplastic resin is not particularly limited as long as it can be deformed under temperature conditions such as fixing and can accept the toner, and can be appropriately selected according to the purpose. And the same type of resins are preferred. In many of the toners, polyester resins, copolymer resins such as styrene and styrene-butyl acrylate are used. In this case, polyester resins, styrene and styrene are also used as thermoplastic resins for the electrophotographic image receiving paper. -It is preferable to use a copolymer resin such as butyl acrylate, more preferably 20% by mass or more of a copolymer resin such as polyester resin, styrene, or styrene-butyl acrylate. Polymers, styrene-acrylic acid ester copolymers, styrene-methacrylic acid ester copolymers and the like are also preferable.
[0080]
Specific examples of the thermoplastic resin include, for example, (a) a resin having an ester bond, (b) a polyurethane resin, (c) a polyamide resin, (d) a polysulfone resin, (e) a polyvinyl chloride resin, and the like. (F) Polyvinyl butyral, (g) Polycaprolactone resin, (h) Polyolefin resin, and the like.
[0081]
Examples of the resin having an ester bond (b) include terephthalic acid, isophthalic acid, maleic acid, fumaric acid, phthalic acid, adipic acid, sebacic acid, azelaic acid, abietic acid, succinic acid, trimellitic acid, and pyromellitic acid. Dicarboxylic acid components such as acids (these dicarboxylic acid components may be substituted with sulfonic acid groups, carboxyl groups, etc.) and diether derivatives of ethylene glycol, diethylene glycol, propylene glycol, bisphenol A, bisphenol A (for example, Bisphenol A ethylene oxide 2 adducts, bisphenol A propylene oxide 2 adducts, etc.), bisphenol S, 2-ethylcyclohexyldimethanol, neopentyl glycol, cyclohexyldimethanol, glycerin, etc. Polyacrylic acid ester resins such as polyester resins, polymethyl methacrylate, polybutyl methacrylate, polymethyl acrylate, polybutyl acrylate, etc. obtained by condensation with the alcohol component (these alcohol components may be substituted with hydroxyl groups, etc.) Alternatively, polymethacrylic acid ester resin, polycarbonate resin, polyvinyl acetate resin, styrene acrylate resin, styrene-methacrylic acid ester copolymer resin, vinyl toluene acrylate resin, and the like can be given.
Specific examples include those described in JP-A Nos. 59-101395, 63-7971, 63-7972, 63-7773, and 60-294862.
[0082]
Examples of commercially available polyester resins include Toyobo's Byron 290, Byron 200, Byron 280, Byron 300, Byron 103, Byron GK-140, Byron GK-130; Kao's Tufton NE-382, Tufton U- 5, ATR-2009, ATR-2010; Elitel UE3500, UE3210, XA-8153 manufactured by Unitika; Polyester TP-220, R-188 manufactured by Nippon Synthetic Chemical Co., Ltd.
Commercially available products of the acrylic resin include Mitsubishi Rayon Co., Ltd. Dianal SE-5437, SE-5102, SE-5377, SE-5649, SE-5466, SE-5482, HR-169, 124, HR-1127. , HR-116, HR-113, HR-148, HR-131, HR-470, HR-634, HR-606, HR-607, LR-1065, 574, 143, 396, 637, 162, 469, 216 , BR-50, BR-52, BR-60, BR-64, BR-73, BR-75, BR-77, BR-79, BR-80, BR-83, BR-85, BR-87, BR -88, BR-90, BR-93, BR-95, BR-100, BR-101, BR-102, BR-105, BR-106, BR-107, BR- 08, BR-112, BR-113, BR-115, BR-116, BR-117; Sreck P SE-0020, SE-0040, SE-0070, SE-0100, SE-1010, SE- manufactured by Sekisui Chemical Co., Ltd. 1035; Sanyo Chemical Industries Himer ST95, ST120; FM601 manufactured by Mitsui Chemicals.
[0083]
Examples of the (e) polyvinyl chloride resin include polyvinylidene chloride resin, vinyl chloride-vinyl acetate copolymer resin, vinyl chloride-vinyl propionate copolymer resin, and the like.
Examples of (f) polyvinyl butyral include cellulose resins such as polyol resin, ethyl cellulose resin, and cellulose acetate resin. Examples of commercially available products include those manufactured by Denki Kagaku Kogyo Co., Ltd. and Sekisui Chemical Co., Ltd. The polyvinyl butyral preferably has a polyvinyl butyral content of 70% by mass or more, an average polymerization degree of 500 or more, and more preferably an average polymerization degree of 1000 or more. Examples of commercially available products include Denka Butyral 3000-1, 4000-2, 5000A, 6000C manufactured by Denki Kagaku Kogyo Co., Ltd .; S-REC BL-1, BL-2, BL-3, BL-S, BX manufactured by Sekisui Chemical Co., Ltd. -L, BM-1, BM-2, BM-5, BM-S, BH-3, BX-1, BX-7, and the like.
Examples of the (g) polycaprolactone resin include styrene-maleic anhydride resin, polyacrylonitrile resin, polyether resin, epoxy resin, phenol resin, and the like.
Examples of the (h) polyolefin resin include polyethylene resins, polypropylene resins, copolymer resins of olefins such as ethylene and propylene and other vinyl monomers, acrylic resins, and the like.
[0084]
The said thermoplastic resin may be used individually by 1 type, may be 2 or more types, In addition to these, these mixtures, these copolymers, etc. can also be used.
[0085]
The thermoplastic resin is preferably one that can satisfy the following properties of the toner image-receiving layer in the state where the toner image-receiving layer is formed, more preferably one that can satisfy the above-mentioned properties of the toner image-receiving layer even with the resin alone. It is also preferable to use two or more resins having different layer properties.
[0086]
As the thermoplastic resin, those having a larger molecular weight than the thermoplastic resin used in the toner are preferable. However, the molecular weight described above is not necessarily preferable depending on the relationship between the thermodynamic properties of the thermoplastic resin used in the toner and the resin used in the toner image-receiving layer. For example, when the softening temperature of the resin used in the toner image receiving layer is higher than that of the thermoplastic resin used in the toner, the molecular weight is the same or the resin used in the toner image receiving layer is the same. Smallness may be preferred.
[0087]
It is also preferable to use a mixture of resins having the same composition and different average molecular weights as the thermoplastic resin. Further, as the relationship with the molecular weight of the thermoplastic resin used in the toner, the relationship disclosed in JP-A-8-334915 is preferable.
The molecular weight distribution of the thermoplastic resin is preferably wider than the molecular weight distribution of the thermoplastic resin used in the toner.
Examples of the thermoplastic resin include JP-B-5-127413, JP-A-8-194394, JP-A-8-334915, JP-A-8-334916, JP-A-9-171265, and JP-A-10. Those satisfying the physical properties disclosed in the publication No. 221877 / etc. Are preferred.
[0088]
The thermoplastic resin used for the toner image-receiving layer is particularly preferably an aqueous resin such as a water-soluble resin or a water-dispersible resin for the following reasons (i) to (ii).
(I) The organic solvent is not discharged in the coating and drying process, and is excellent in environmental suitability and work suitability.
(Ii) Many release agents such as wax are difficult to dissolve in a solvent at room temperature, and are often dispersed in a solvent (water, organic solvent) in advance. Further, the water dispersion form is more stable and more suitable for the production process. Furthermore, the water-based coating is more likely to cause the wax to bleed onto the surface during the coating and drying process, and the effects of the release agent (offset resistance, adhesion resistance, etc.) can be easily obtained.
[0089]
As the water-based resin, if it is a water-soluble resin or a water-decomposable resin, its composition, bond structure, molecular structure, molecular weight, molecular weight distribution, and form are not specified. Examples of the water-based group of the polymer include a sulfonic acid group, a hydroxyl group, a carboxylic acid group, an amino group, an amide group, or an ether group.
Examples of the water-soluble resin include Research Disclosure No. 17,643, page 26, No. 18,716, page 651, No. 307,105, pages 873-874, and JP-A No. 64-13546. 71) to those described on pages (75) to (75).
Specifically, vinyl pyrrolidone-vinyl acetate copolymer, styrene-vinyl pyrrolidone copolymer, styrene-maleic anhydride copolymer, water-soluble polyester, water-soluble acrylic, water-soluble polyurethane, water-soluble nylon, water-soluble epoxy Resin can be used. Further, the gelatin may be selected from so-called demineralized gelatin in which the content of lime-processed gelatin, acid-processed gelatin, calcium, or the like is reduced in accordance with various purposes, and is preferably used in combination. Commercially available as water-soluble polyester, various plus coats manufactured by Teraoh Chemical Industry Co., Ltd .; Dainippon Ink Chemicals Co., Ltd. Finetex ES series; Finetex 6161, K-96; Hiros NL-1189, BH-997L manufactured by Seiko Chemical Industry, and the like.
[0090]
Examples of water-dispersible resins include water-dispersed resins such as water-dispersed acrylic resins, water-dispersed polyester resins, water-dispersed polystyrene resins, and water-dispersed urethane resins; acrylic resin emulsions, polyvinyl acetate emulsions, and SBR (styrene / butadiene). -Rubber) Emulsions such as emulsions, resins and emulsions in which the thermoplastic resins (a) to (h) above are dispersed in water, or their copolymers, mixtures, and cationically modified ones are appropriately selected. Two or more types can be combined.
Commercially available products of the water-dispersible resin include, for example, Toyobo's Bironal series, Takamatsu Yushi pesresin A series, Kao Tufton UE series, Nippon Synthetic Polyester WR series, Unitika Eliere series, and acrylic series. Then, high loss XE, KE, PE series manufactured by Seiko Chemical Industry, Jurimer ET series manufactured by Nippon Pure Chemical Co., Ltd. and the like can be mentioned.
The film formation temperature (MFT) of the polymer used is preferably room temperature or higher for storage before printing, and preferably 100 ° C. or lower for fixing of toner particles.
[0091]
The thickness of the toner image-receiving layer is suitably ½ or more, preferably 1 to 3 times the particle diameter of the toner used. The toner image receiving layer preferably has a thickness disclosed in JP-A-5-216322 and JP-A-7-301939. Specifically, the thickness of the toner image receiving layer is, for example, preferably 1 to 50 μm, and more preferably 5 to 15 μm.
[0092]
As a component other than the thermoplastic resin in the toner image receiving layer, the light transmittance of the toner image receiving layer can be easily adjusted within the numerical range, and in particular, the whiteness of the toner image receiving layer can be adjusted. Colorants such as pigments and dyes are preferred, and pigments are particularly preferred. In addition, the other components include various additives added for the purpose of improving the thermodynamic properties of the toner image-receiving layer, such as plasticizers, mold release agents or slip agents, matting agents, fillers, and crosslinking agents. , Charge control agents, emulsions, dispersions and the like.
[0093]
The content of the thermoplastic resin in the toner image-receiving layer is preferably 50% by mass or more, and more preferably 50 to 90% by mass.
[0094]
-Colorant-
Examples of the colorant include fluorescent brighteners, white pigments, colored pigments, dyes, and the like.
The fluorescent whitening agent is a compound that absorbs in the near ultraviolet region and emits fluorescence at 400 to 500 nm, and various known fluorescent whitening agents can be used without particular limitation. Examples of the optical brightener include K.I. Preferable examples include the compounds described in “The Chemistry of Synthetic Dies” edited by Veen Rataraman, Vol. Specific examples include stilbene compounds, coumarin compounds, biphenyl compounds, benzoxazoline compounds, naphthalimide compounds, pyrazoline compounds, carbostyril compounds, and the like. As a commercial item of the said fluorescent whitening agent, Sumitomo Chemical white fur fur PSN, PHR, HCS, PCS, B; UVITEX-OB made from Ciba-Geigy etc. are mentioned, for example.
[0095]
As said white pigment, inorganic pigments, such as a titanium oxide and a calcium carbonate, can be used, for example.
Examples of the colored pigment include various pigments and azo pigments described in JP-A-63-44653 (for example, azo lake; carmine 6B, red 2B, insoluble azo; monoazo yellow, disazo yellow, pyrazolo orange, vulcan orange, Condensed azo series; chromophyl yellow, chromophthal red), polycyclic pigments (eg, phthalocyanine series; copper phthalocyanine blue, copper phthalocyanine green, dioxazine series; dioxazine violet, isoindolinone series; isoindolinone yellow, slen series Perylene, perinone, flavantron, thioindigo, lake pigment (eg, malachite green, rhodamine B, rhodamine G, Victoria blue B), and inorganic pigment (eg, oxide, titanium dioxide, bengara, sulfate); Um, carbonate; precipitated calcium carbonate, succinate; hydrous succinate, anhydrous succinate, metal powder; aluminum powder, bronze powder, zinc dust, carbon black, yellow lead, bitumen, etc.) .
These may be used alone or in combination of two or more. Among these, titanium oxide is particularly preferable as the pigment.
[0096]
Although there is no restriction | limiting in particular as a shape of the said pigment, It is preferable that it is a hollow particle shape at the point which is excellent in the heat conductivity at the time of image fixing (low heat conductivity).
[0097]
As the dye, various dyes such as oil-soluble dyes and water-insoluble dyes can be used.
Examples of the oil-soluble dye include anthraquinone compounds and azo compounds.
Examples of the water-insoluble dye include C.I. I. Vat violet 1, C.I. I. Vat violet 2, C.I. I. Vat violet 9, C.I. I. Vat violet 13, C.I. I. Vat violet 21, C.I. I. Vat Blue 1, C.I. I. Vat Blue 3, C.I. I. Vat Blue 4, C.I. I. Vat Blue 6, C.I. I. Vat Blue 14, C.I. I. Vat Blue 20, C.I. I. Vat dyes such as Vat Blue 35; I. Dispers Violet 1, C.I. I. Disperse Violet 4, C.I. I. Disperse Violet 10, C.I. I. Disperse Blue 3, C.I. I. Disperse Blue 7, C.I. I. Disperse dyes such as Disperse Blue 58; I. Solvent Violet 13, C.I. I. Solvent Violet 14, C.I. I. Solvent Violet 21, C.I. I. Solvent Violet 27, C.I. I. Solvent Blue 11, C.I. I. Solvent Blue 12, C.I. I. Solvent Blue 25, C.I. I. Solvent Blue 55, and the like.
A colored coupler used in silver salt photography can also be preferably used.
[0098]
Content of the colorant in the toner image receiving layer (surface) (g / m²) As 0.1 to 8 g / m²Is preferably 0.5 to 5 g / m²Is more preferable.
The content of the colorant is 0.1 g / m²If it is less than 1, the light transmittance in the toner image-receiving layer may increase, and 8 g / m²If it exceeds 1, handling properties such as cracking and adhesion resistance may deteriorate.
Further, among the colorants, as described above, the addition amount of the pigment is preferably less than 40% by mass, more preferably 30% by mass or less, based on the mass of the thermoplastic resin constituting the toner image receiving layer. A mass% or less is more preferable.
[0099]
-Release agent-
The release agent is blended in the toner image receiving layer in order to prevent the toner image receiving layer from being offset. The release agent is heated and melted at the fixing temperature, deposited on the surface of the toner image-receiving layer, unevenly distributed on the surface of the toner image-receiving layer, and further cooled and solidified to form a release agent material on the surface of the toner image-receiving layer. If it forms a layer, there will be no restriction | limiting in particular, According to the objective, it can select suitably.
Examples of the release agent include at least one selected from a silicone compound, a fluorine compound, a wax, and a matting agent. Among these, at least one selected from silicone oil, polyethylene wax, carnauba wax, silicone particles, and polyethylene wax particles is particularly preferable.
[0100]
Specifically, as the mold release agent, for example, compounds described in “Summary and Application of Revised Wax” by Kosshobo and Silicone Handbook published by Nikkan Kogyo Shimbun, Ltd. can be used. JP-B-59-38581, JP-B-4-32380, Patent Nos. 2838498, 2949558, JP-A-50-117433, 52-52640, 57-148755, 61-62056. 61-62057, 61-118760, JP-A-2-42451, 3-41465, 4-212175, 4-214570, 4-263267, 5-34966, 5-119514, 6-59502, 6-161150, 6-175396, 6-219040, 6-230600, 6-295093, 7-36210, 7 -43940, 7-56387, 7-56390, 7-64335, 7-199682, 7-223362 7-287413, 8-184992, 8-227180, 8-248671, 8-248799, 8-248801, 8-278663, 9-152939, 9 -160278, 9-185181, 9-319139, 9-319143, 10-20549, 10-48889, 10-198069, 10-207116, 11-2917 No. 11-44969, No. 11-65156, No. 11-73049, No. 11-194542, and the silicone compounds, fluorine compounds, and waxes used in the toners are also preferably used. . A plurality of these compounds can be used in combination.
[0101]
Examples of the silicone compounds include non-modified silicone oils as silicone oils (specifically, dimethylsiloxane oil, methyl hydrogen silicone oil, phenylmethyl silicone oil, commercially available products KF-96 and KF-96L manufactured by Shin-Etsu Chemical Co., Ltd.). KF-96H, KF-99, KF-50, KF-54, KF-56, KF-965, KF-968, KF-994, KF-995, HIVAC F-4, F-5; Toray Dow Corning SH200, SH203, SH490, SH510, SH550, SH710, SH704, SH705, SH7028A, SH7036, SM7060, SM7001, SM7706, SH7036, SH8710, SH1107, SH8627; Toshiba TSF 00, TSF401, TSF404, TSF405, TSF431, TSF433, TSF434, TSF437, TSF450 series, TSF451 series, TSF456, TSF458 series, TSF483, TSF484, TSF4045, TSF4300, TSF4600, YF33 series, YF-3057, YF-3800 3802, YF-3804, YF-3807, YF-3897, XF-3905, XS69-A1753, TEX100, TEX101, TEX102, TEX103, TEX104, TSW831, etc., amino-modified silicone oil (KF manufactured by Shin-Etsu Chemical Co., Ltd. as a commercial product) -857, KF-858, KF-859, KF-861, KF-864, KF-880, Toray Dow Corning Ricone SF8417, SM8709, Toshiba Silicone TSF4700, TSF4701, TSF4702, TSF4703, TSF4704, TSF4705, TSF4706, TEX150, TEX151, TEX154, etc., carboxy-modified silicone oil (Toray Dow Corning Silicone BY16-880, commercially available products) Toshiba silicone TSF4770, XF42-A9248, etc.), carbinol modified silicone oil (commercially available Toshiba Silicone XF42-B0970 etc.), vinyl modified silicone oil (commercially available Toshiba Silicone XF40-A1987 etc.), epoxy modified silicone oil (As commercial products, Toray Dow Corning Silicone SF8411, SF8413; Toshiba Silicone T F3965, TSF4730, TSF4732, XF42-A4439, XF42-A4438, XF42-A5041, XC96-A4462, XC96-A4463, XC96-A4464, TEX170, etc., polyether-modified silicone oil (KF-351 manufactured by Shin-Etsu Chemical Co., Ltd. as a commercial product) (A), KF-352 (A), KF-353 (A), KF-354 (A), KF-355 (A), KF-615 (A), KF-618, KF-945 (A); Toray Dow Corning Silicone SH3746, SH3771, SF8421, SF8419, SH8419, SH8410; Toshiba Silicone TSF4440, TSF4441, TSF4445, TSF4446, TSF4450, TSF4452, TSF4453, TSF4 60), silanol-modified silicone oil, methacryl-modified silicone oil, mercapto-modified silicone oil, alcohol-modified silicone oil (commercially available products include Toray Dow Corning Silicone SF8427, SF8428, Toshiba Silicone TSF4750, TSF4751 and XF42-B0970) , Alkyl-modified silicone oil (SF8416 made by Toray Dow Corning Silicone, TSF410, TSF411, TSF4420, TSF4421, TSF4422, TSF4450, XF42-334, XF42-A3160, XF42-A3161, etc. made by Toshiba Silicone) Oil (commercially available Toray Dow Corning Silicone FS1265, Toshiba Silicone FQF 501), silicone rubber and silicone fine particles (Toray Dow Corning Silicone SH851U, SH745U, SH55UA, SE4705U, SH502UA & B, SRX539U, SE6770U-P, DY38-038, DY38-047, Trefill F-201, F -202, F-250, R-900, R-902A, E-500, E-600, E-601, E-506, BY29-119; Toshiba Silicone Tospearl 105, 120, 130, 145, 240, 3120 Etc.), silicone-modified resins (specifically, olefin resins, polyester resins, vinyl resins, polyamide resins, cellulose resins, phenoxy resins, vinyl chloride-vinyl acetate resins, urethane resins, acrylic resins, styrene-acrylic resins) As a commercial product, such as a compound obtained by modifying these copolymer resins with silicone, etc. Asahi Seika's Dialomer SP203V, SP712, SP2105, SP3023; Nippon Oil & Fats Modiper FS700, FS710, FS720, FS730, FS770; -270, US-350, US-352, US-380, US-413, US-450, Reseda GP-705, GS-30, GF-150, GF-300; Toray Dow Corning Silicone SH997, SR2114 , SH2104, SR2115, SR2202, DCI-2577, SR2317, SE4001U, SRX625B, SRX643, SRX439U, SRX488U, SH804, SH840, SR2107, SR2115; Toshiba series YR3370, TSR1122, TSR102, TSR108, TSR116, TSR117, TSR125A, TSR127B, TSR144, TSR180, TSR187, YR47, YR3187, YR3224, YR3232, YR3270, YR3286, YR3340, XR1365, TE2 , Reactive silicone compounds (specifically, there are addition reaction type, peroxide curing type, ultraviolet curing type, and TSR1500, TSR1510, TSR1511, TSR1515, TSR1520, YR3286, YR3340, PSA6574, manufactured by Toshiba Silicones as commercially available products. TPR6500, TPR6501, TPR6600, TPR6702, TPR6604, TPR670 0, TPR6701, TPR6705, TPR6707, TPR6708, TPR6710, TPR6712, TPR6721, TPR6722, UV9300, UV9315, UV9425, UV9430, XS56-A2775, XS56-A2982, XS56-A3075, XS56-A3969, XS56X80 XS56-B1794, SL6100, SM3000, SM3030, SM3200, YSR3022, etc.).
[0102]
Examples of the fluorine compound include fluorine oil (Daikin Industries # 1, # 3, # 10, # 20, # 50, # 100, Unidyne TG-440, TG-452, TG-490, TG as commercially available products). -560, TG-561, TG-590, TG-652, TG-670U, TG-991, TG-999, TG-3010, TG-3020, TG-3510; TF-100, MF-110 manufactured by Tochem Products , MF-120, MF-130, MF-160, MF-160E; Asahi Glass Surflon S-111, S-112, S-113, S-121, S-131, S-132, S-141, S- 145; Mitsui Fluorochemicals FC-430, FC-431, etc.), fluoro rubber (Toray Dow Corning Silicone L as a commercial product) 63U, etc.), fluorine-modified resin (Nippon Yushi Modiper F200, F220, F600, F2020, F3035; Dainippon Chemical Dialomer FF203, FF204; Asahi Glass Surflon S-381, S-383, S-393, SC -101, SC-105, KH-40, SA-100; manufactured by Tochem Products EF-351, EF-352, EF-801, EF-802, EF-601, TFE, TFEA, TFEMA, PDFOH; manufactured by Sumitomo 3M THV-200P, etc.), fluorine sulfonic acid compounds (commercially available products from Tochem Products such as EF-101, EF-102, EF-103, EF-104, EF-105, EF-112, EF-121, EF-122A, EF-122B, EF-122C, EF-123A, EF-12 B, EF-125M, EF-132, EF-135M, EF-305, FBSA, KFBS, LFBS, etc.), fluorosulfonic acid, fluoric acid compounds and salts (specifically, anhydrous hydrofluoric acid, dilute hydrofluoric acid, borohydrofluoric acid) , Zinc borofluoride, nickel borofluoride, tin borofluoride, lead borofluoride, copper borofluoride, silicofluoric acid, potassium fluorotitanate, perfluorocaprylic acid, ammonium perfluorooctanoate), inorganic fluoride (specifically Is aluminum fluoride, potassium silicofluoride, potassium fluoride zirconate, zinc fluoride tetrahydrate, calcium fluoride, lithium fluoride, barium fluoride, tin fluoride, potassium fluoride, acidic potassium fluoride, fluoride Magnesium, fluorinated titanic acid, fluorinated zirconic acid, ammonium hexafluorophosphate, hexafluorophosphoric acid Potassium etc.).
[0103]
Examples of the wax include synthetic hydrocarbons, modified waxes, hydrogenated waxes, natural waxes, and the like.
[0104]
Examples of the synthetic hydrocarbon include polyethylene wax (as commercial products, Polylon A, 393, H-481, manufactured by Chukyo Yushi Co., Ltd., Sanyo Kasei Sun Wax E-310, E-330, E-250P, LEL-250, LEL- 800, LEL-400P, etc.), polypropylene wax (commercially available Sanyo Chemical Co., Ltd. Biscol 330-P, 550-P, 660-P), Fischer-Tropsch wax (commercially available products such as Nippon Seiki FT100, FT-0070, etc.) , Acid amide compounds or acid imide compounds (specifically, stearamide, phthalimide anhydride, etc., commercially available products such as Chukyo Oil & Fats Cellosol 920, B-495, High Micron G-270, G-110, Hydrin D- 757) and the like.
[0105]
Examples of the modified wax include amine-modified polypropylene (QN-7700 manufactured by Sanyo Chemical Co., Ltd. as a commercial product), acrylic acid-modified, fluorine-modified, olefin-modified wax, and urethane type wax (NPS-6010 manufactured by Nippon Seiki Co., Ltd. as a commercial product). -5090), alcohol type wax (NPS-9210, NPS-9215, OX-1949, XO-020T, etc., manufactured by Nippon Seiki) and the like.
[0106]
Examples of the hydrogenated wax include hardened castor oil (as a commercially available product, castor wax from Ito Oil Co., Ltd.), castor oil derivatives (dehydrated castor oil DCO, DCO Z-1, DCO Z-3, castor from Ito Oil as commercial products). Oil fatty acid CO-FA, ricinoleic acid, dehydrated castor oil fatty acid DCO-FA, dehydrated castor oil fatty acid epoxy ester D-4 ester, castor oil-based urethane acrylate CA-10, CA-20, CA-30, castor oil derivative MINERASOL S -74, S-80, S-203, S-42X, S-321, Special castor oil-based condensed fatty acid MINERASOL RC-2, RC-17, RC-55, RC-335, Special castor oil-based condensed fatty acid ester MINERASOL LB-601, LB-603, LB-604, LB-702, L B-703, # 11, L-164, etc.), stearic acid (12-hydroxystearic acid made by Ito Oil as a commercial product), lauric acid, myristic acid, palmitic acid, behenic acid, sebacic acid (as commercial products) Sebacic acid from Ito Oil), undecylenic acid (such as undecylenic acid from Ito Oil as a commercial product), heptylic acid (such as heptyl acid from Ito Oil as a commercial product), maleic acid, highly maleated oil (as a commercial product) HIMALIN DC-15, LN-10, 00-15, DF-20, SF-20, etc., manufactured by Ito Oil Co., Ltd., blown oil (commercially available, Celbonol # 10, # 30, # 60, R-40 manufactured by Ito Oil Co., Ltd.) , S-7, etc.), cyclopentadiene oil (CP oil, CP oil-S, etc. made by Ito Oil Co., Ltd. as commercial products) and the like.
[0107]
The natural wax is preferably at least one selected from plant waxes, animal waxes, mineral waxes and petroleum waxes, particularly preferably plant waxes. As the natural wax, a water-dispersed wax is particularly preferable from the viewpoint of compatibility when a water-based thermoplastic resin is used as the thermoplastic resin of the toner image-receiving layer.
[0108]
Examples of the plant wax include carnauba wax (commercially available products such as EMUSTAR-0413 manufactured by Nippon Seiki, Cerosol 524 manufactured by Chukyo Yushi), castor oil (refined castor oil manufactured by Ito Oil Co., Ltd. as a commercial product), rapeseed oil, large Examples include bean oil, wax, cotton wax, rice wax, sugarcane wax, candelilla wax, Japan wax, jojoba oil, and the like. Among these, in particular, it has an excellent offset resistance, adhesion resistance, paper permeability, glossiness, is resistant to cracking, and can provide an electrophotographic image-receiving sheet capable of forming a high-quality image. Is particularly preferably a carnauba wax having a temperature of 70 to 95 ° C.
Examples of the animal wax include beeswax, lanolin, spermaceti, stew wax (whale oil), and wool wax.
[0109]
Examples of the mineral wax include, for example, montan wax, montan ester wax, ozokerite, ceresin, and fatty acid ester (commercially available products are Nippon Sanka's Sansosizer DOA, AN-800, DINA, DIDA, DOZ, DOS, TOTM, TITM. , E-PS, nE-PS, E-PO, E-4030, E-6000, E-2000H, E-9000H, TCP, C-1100, etc.). Among these, in particular, it has an excellent offset resistance, adhesion resistance, paper permeability, glossiness, is resistant to cracking, and can provide an electrophotographic image-receiving sheet capable of forming a high-quality image. Is particularly preferably a montan wax having a temperature of 70 to 95 ° C.
[0110]
Examples of the petroleum wax include paraffin wax (paraffin wax 155, 150, 140, 135, 130, 125, 120, 115, HNP-3, HNP-5, HNP-9, HNP- 10, HNP-11, HNP-12, HNP-14G, SP-0160, SP-0145, SP-1040, SP-1035, SP-3040, SP-3035, NPS-8070, NPS-L-70, OX- 2151, OX-2251, EMUSTAR-0384, EMUSTAR-0136, Chukyo Oil & Fats Cellosol 686, 428, 651-A, A, H-803, B-460, E-172, 866, K-133, Hydrin D-337 E-139, 125 ° paraffin, 125 ° FD, 130 ° Fins, 135 ° paraffin, 135 ° H, 140 ° paraffin, 140 ° N, 145 ° paraffin, paraffin wax M, etc., microcrystalline wax (commercially available from Nihon Seiki Hi-Mic-2095, Hi-Mic-3090) , Hi-Mic-1080, Hi-Mic-1070, Hi-Mic-2065, Hi-Mic-1045, Hi-Mic-2045, EMUSTAR-0001, EMUSTAR-042X, Chukyo Yushi Cellosol 967, M, Mitsubishi Petroleum (manufactured by Nippon Seiki OX-1749, OX-0450, OX-0650B, OX-0153, OX-261BN, OX-0551, OX-0550, OX) -0750B, JP- 500, JP-056R, such as JP-011P), and the like.
[0111]
Content (g / m) of the natural wax in the toner image-receiving layer (surface)²) As 0.1 to 4 g / m²Is preferably 0.2 to 2 g / m²Is more preferable. The content is 0.1 g / m²If it is less than 4 g / m, offset resistance and adhesion resistance may be particularly insufficient.²If it exceeds 1, the amount of wax is too large, and the image quality of the formed image may be inferior.
[0112]
The melting point (° C.) of the natural wax is preferably 70 to 95 ° C., more preferably 75 to 90 ° C., particularly in terms of offset resistance and paper passing properties.
[0113]
Examples of the matting agent include various known ones. Solid particles used as the matting agent can be classified into inorganic particles and organic particles. Specific examples of the material for the inorganic matting agent include oxides (for example, silicon dioxide, titanium oxide, magnesium oxide, aluminum oxide), alkaline earth metal salts (for example, barium sulfate, calcium carbonate, magnesium sulfate), halogens Examples include silver halide (eg, silver chloride, silver bromide) and glass.
[0114]
Examples of the inorganic matting agent include West German Patent 2529321, British Patent 760775, 1260772, U.S. Patent 1201905, 2192241, 3030562, 3030649, 3257206, 3322555, and 3353958. No. 3,370,951, No. 3,411,907, No. 3,437,484, No. 3523022, No. 3,615,554, No. 3,635,714, No. 3769020, No. 40212245, and No. 4029504.
[0115]
The material of the organic matting agent includes starch, cellulose ester (for example, cellulose acetate propionate), cellulose ether (for example, ethyl cellulose) and synthetic resin. The synthetic resin is preferably water-insoluble or poorly water-soluble. Examples of the water-insoluble or poorly water-soluble synthetic resin include poly (meth) acrylic acid esters (for example, polyalkyl (meth) acrylate, polyalkoxyalkyl (meth) acrylate, polyglycidyl (meth) acrylate), poly (meth) acrylate. ) Acrylamide, polyvinyl ester (eg, polyvinyl acetate), polyacrylonitrile, polyolefin (eg, polyethylene), polystyrene, benzoguanamine resin, formaldehyde condensation polymer, epoxy resin, polyamide, polycarbonate, phenol resin, polyvinyl carbazole, polyvinylidene chloride, etc. Is mentioned.
You may use the copolymer which combined the monomer used for the above polymer.
[0116]
In the case of the copolymer, a small amount of hydrophilic repeating units may be contained. Examples of the monomer that forms the hydrophilic repeating unit include acrylic acid, methacrylic acid, α, β-unsaturated dicarboxylic acid, hydroxyalkyl (meth) acrylate, sulfoalkyl (meth) acrylate, and styrene sulfonic acid.
Examples of the organic matting agent include British Patent No. 1055713, U.S. Pat. Nos. 3,262,782, 3,443,946, 3,516,832, 3,539,344, 3,591,379, 3,754,924, 3,767,448, JP-A-49-106821, JP-A-57-14835 Are described in the above.
Two or more kinds of solid particles may be used in combination. The average particle size of the solid particles is, for example, preferably 1 to 100 μm, and more preferably 4 to 30 μm. The amount of the solid particles used is 0.01 to 0.5 g / m.²Is preferred, 0.02-0.3 g / m²Is more preferable.
[0117]
As the release agent added to the toner image-receiving layer of the present invention, these derivatives, oxides, purified products, and mixtures can also be used. Moreover, these may have a reactive substituent.
[0118]
The melting point (° C.) of the release agent is preferably 70 to 95 ° C., and more preferably 75 to 90 ° C., particularly in terms of offset resistance and paper passing properties.
The release agent is particularly preferably a water-dispersed release agent from the viewpoint of compatibility when an aqueous thermoplastic resin is used as the thermoplastic resin of the toner image receiving layer.
[0119]
The content of the release agent in the toner image-receiving layer is preferably 0.1 to 10% by mass, more preferably 0.3 to 8.0% by mass, and still more preferably 0.5 to 5.0% by mass. .
[0120]
-Plasticizer-
As the plasticizer, known plasticizers for resins can be used without particular limitation. The plasticizer has a function of adjusting the flow or softening of the toner image-receiving layer by either heat or pressure when fixing the toner.
Examples of the plasticizer include "Chemical Handbook" (edited by the Chemical Society of Japan, Maruzen), "Plasticizer-Theory and Application-" (edited by Koichi Murai, Koshobo), "Research on plasticizer" "Study under" (edited by Polymer Chemistry Association) and "Handbook Rubber and Plastic Compounded Chemicals" (edited by Rubber Digest Co., Ltd.).
[0121]
Examples of the plasticizer include phthalic acid esters, phosphoric acid esters, fatty acid esters, abietic acid esters, adipic acid esters, sebacic acid esters, azelaic acid esters, benzoic acid esters, butyric acid esters. Epoxidized fatty acid esters, glycolic acid esters, propionic acid esters, trimellitic acid esters, citric acid esters, sulfonic acid esters, carboxylic acid esters, succinic acid esters, maleic acid esters, fumaric acid Esters, phthalic acid esters, stearic acid esters, etc .; amides (for example, fatty acid amides, sulfoamides, etc.), ethers, alcohols, lactones, polyethyleneoxys, etc. -83154, 59-178451 59-178453, 59-178454, 59-178455, 59-178457, 62-174754, 62-245253, 61-209444, 61-200538, 62 No.-8145, No. 62-9348, No. 62-30247, No. 62-136646, No. 62-174754, No. 62-245253, No. 61-209444, No. 61-200538, No. 62-8145 Nos. 62-9348, 62-30247, 62-136646, JP-A-2-235694, etc.). In addition, the said plasticizer can be mixed and used for resin.
[0122]
A relatively low molecular weight polymer can be used as the plasticizer. In this case, the molecular weight of the plasticizer is preferably lower than the molecular weight of the binder resin to be plasticized. The molecular weight is preferably 15000 or less, and more preferably 5000 or less. In the case of a polymer plasticizer, the polymer is preferably the same type as the binder resin to be plasticized. For example, a low molecular weight polyester is preferable for plasticizing a polyester resin. Furthermore, oligomers can also be used as plasticizers. In addition to the above compounds, commercially available products include, for example, Adeka Sizer PN-170, PN-1430 manufactured by Asahi Denka Kogyo; P. HALL products PARAPLEX-G-25, G-30, G-40; Rika Hercules products Ester gum 8L-JA, Ester R-95, Pentaline 4851, FK115, 4820, 830, Louisol 28-JA, Picolastic A75, Pico Tex LC, Crystallex 3085, etc. are mentioned.
[0123]
The plasticizer relieves stress and strain (physical strain such as elastic force and viscosity, strain due to mass balance of molecules, binder main chain, pendant, etc.) generated when toner particles are embedded in the toner image receiving layer. Can be used arbitrarily to The plasticizer may be in a micro-dispersed state in the toner image-receiving layer, may be in a phase-separated microscopically in a sea-island shape, or may be in a sufficiently mixed and dissolved state with other components such as a binder.
The content of the plasticizer in the toner image-receiving layer is preferably 0.001 to 90% by mass, more preferably 0.1 to 60% by mass, and still more preferably 1 to 40% by mass.
The plasticizer adjusts smoothness (improves transportability due to reduced frictional force), improves fixing unit offset (detachment of toner and layers from the fixing unit), adjusts curl balance, and adjusts charging (toner electrostatic image It may be used for the purpose of forming).
[0124]
-Filler-
As said filler, an organic or inorganic filler is mentioned, A well-known thing can be used as a reinforcing agent for binder resin, a filler, and a reinforcing material. The filler should be selected with reference to "Handbook Rubber / Plastic Compounding Chemicals" (edited by Rubber Digest Co., Ltd.), "New Edition Plastic Compounding Agent Fundamentals and Applications" (Taiseisha), "Filler Handbook" (Taiseisha), etc. Can do.
As the filler, an inorganic filler (or inorganic pigment) can be suitably used. Examples of the inorganic filler (inorganic pigment) include silica, alumina, titanium dioxide, zinc oxide, zirconium oxide, mica-like iron oxide, lead white, lead oxide, cobalt oxide, strontium chromate, molybdenum pigment, smectite, magnesium oxide. , Calcium oxide, calcium carbonate, mullite, and the like. Among these, silica and alumina are preferable. These may be used alone or in combination of two or more. Moreover, as said filler, a thing with a small particle size is preferable. If the particle size is large, the surface of the toner image-receiving layer tends to be roughened.
[0125]
The silica includes spherical silica and amorphous silica. The silica can be synthesized by a dry method, a wet method, or an airgel method. The surface of the hydrophobic silica particles may be surface-treated with a trimethylsilyl group or silicone. As silica, colloidal silica is preferable. The average particle size of the silica is preferably 4 to 120 nm, and more preferably 4 to 90 nm.
The silica is preferably porous. The average pore diameter of the porous silica is preferably 50 to 500 nm. Moreover, the average pore volume per mass of the porous silica is preferably, for example, 0.5 to 3 ml / g.
[0126]
The alumina includes anhydrous alumina and alumina hydrate. As the crystal form of anhydrous alumina, α, β, γ, δ, ζ, η, θ, κ, ρ, or χ can be used. Alumina hydrate is preferred over anhydrous alumina. As the alumina hydrate, a monohydrate or a trihydrate can be used. Monohydrates include pseudoboehmite, boehmite and diaspore. Trihydrates include dibsite and bayerite. As an average particle diameter of an alumina, 4-300 nm is preferable and 4-200 nm is more preferable. Alumina is preferably porous. The average pore diameter of porous alumina is preferably 50 to 500 nm. The average pore volume per mass of the porous alumina is preferably 0.3 to 3 ml / g.
[0127]
The alumina hydrate can be synthesized by a sol-gel method in which ammonia is added to an aluminum salt solution to precipitate, or a method in which an alkali aluminate is hydrolyzed. Anhydrous alumina can be obtained by dehydrating alumina hydrate by heating. The filler is preferably 5 to 2000 parts by mass with respect to 100 parts by mass of the dry mass of the binder of the toner image receiving layer.
[0128]
-Crosslinking agent-
The cross-linking agent can be added to adjust the storage stability, thermoplasticity, etc. of the toner image-receiving layer. As the crosslinking agent, a compound having two or more epoxy groups, isocyanate groups, aldehyde groups, active halogen groups, active methylene groups, acetylene groups and other known reactive groups in the molecule as reactive groups is used.
[0129]
As the crosslinking agent, a compound having two or more groups capable of forming a bond by a hydrogen bond, an ionic bond, a coordination bond, or the like can also be used.
Examples of the crosslinking agent include resin coupling agents, curing agents, polymerization agents, polymerization accelerators, coagulants, film-forming agents, film-forming aids, and the like. Examples of the coupling agent include chlorosilanes, vinyl silanes, epoxy silanes, aminosilanes, alkoxyaluminum chelates, titanate coupling agents, etc., and “Handbook Rubber / Plastic Compounding Chemicals” (edited by Rubber Digest Co., Ltd.). ) Etc. can be used.
[0130]
-Charge control agent-
The toner image-receiving layer preferably contains a charge control agent in order to adjust toner transfer, adhesion, etc., and to prevent charge adhesion of the toner image-receiving layer. As the charge control agent, conventionally known various charge control agents can be used. Examples of the charge control agent include surfactants such as cationic surfactants, anionic surfactants, amphoteric surfactants, and nonionic surfactants, polymer electrolytes, conductive metal oxides, and the like. Can be used. For example, quaternary ammonium salts, polyamine derivatives, cation-modified polymethyl methacrylate, cationic antistatic agents such as cation-modified polystyrene, anionic antistatic agents such as alkyl phosphates and anionic polymers, fatty acid esters, polyethylene oxide, etc. Nonionic antistatic agents may be mentioned, but are not limited thereto.
[0131]
When the toner has a negative charge, for example, a cation or nonion is preferable as the charge control agent to be blended in the toner image receiving layer.
Examples of the conductive metal oxide include ZnO and TiO.₂, SnO₂, Al₂O₃, In₂O₃, SiO₂, MgO, BaO, MoO₃Etc. These conductive metal oxides may be used alone or in combination with these composite oxides. In addition, the metal oxide may further contain a different element, for example, Al, In, etc. with respect to ZnO, such as TiO.₂Nb, Ta, etc., SnO₂Can contain (doping) Sb, Nb, a halogen element, or the like.
[0132]
-Other additives-
The material that can be used for the toner image-receiving layer may contain various additives for improving the stability of the output image and for improving the stability of the toner image-receiving layer itself. Examples of the additive include various known antioxidants, antioxidants, deterioration inhibitors, ozone deterioration inhibitors, ultraviolet absorbers, metal complexes, light stabilizers, preservatives, fungicides, and the like.
[0133]
Examples of the antioxidant include a chroman compound, a coumaran compound, a phenol compound (eg, hindered phenol), a hydroquinone derivative, a hindered amine derivative, and a spiroindane compound. The antioxidant is described in JP-A No. 61-159644.
[0134]
Examples of the antiaging agent include those described in “Handbook Rubber / Plastic Compounding Chemicals Revised 2nd Edition” (1993, Rubber Digest Co.) p76-121.
[0135]
Examples of the ultraviolet absorber include a benzotriazole compound (described in US Pat. No. 3,533,794), a 4-thiazolidone compound (described in US Pat. No. 3,352,681), a benzophenone compound (described in Japanese Patent Laid-Open No. Sho 46-2784), Examples thereof include ultraviolet absorbing polymers (described in JP-A-62-260152).
[0136]
Examples of the metal complex include U.S. Pat. Nos. 4,241,155, 4,425,018, and 4,254,195, JP-A-61-88256, JP-A-62-174741, JP-A-63-199248, and JP-A-1-75568. No. 1-74272.
[0137]
As described above, known photographic additives can be added to the material that can be used for the toner image-receiving layer. Examples of the photographic additive include, for example, Research Disclosure Magazine (hereinafter abbreviated as RD) No. 17643 (December 1978), 18716 (November 1979) and 307105 (November 1989), and the corresponding parts are summarized below.

[0138]
[Physical properties of toner image-receiving layer]
The toner image-receiving layer has a 180-degree peel strength at a fixing temperature with the fixing member of preferably 0.1 N / 25 mm or less, and more preferably 0.041 N / 25 mm or less.
Here, the 180-degree peel strength can be measured according to the method described in JIS K6887 using the surface material of the fixing member.
The toner image receiving layer preferably has high whiteness. The whiteness is preferably 85% or more as measured by the method defined in JISP8123. Further, it is preferable that the spectral reflectance is 85% or more in the wavelength region of 440 nm to 640 nm and the difference between the maximum spectral reflectance and the minimum spectral reflectance in the same wavelength region is within 5%. Furthermore, it is more preferable that the spectral reflectance is 85% or more in the wavelength region of 400 nm to 700 nm, and the difference between the maximum spectral reflectance and the minimum spectral reflectance in the same wavelength region is within 5%.
Further, as the whiteness, specifically, CIE 1976 (L^*a^*b^*) In color space, L^*The value is preferably 80 or more, more preferably 85 or more, and still more preferably 90 or more. Further, the white color is preferably as neutral as possible. As the white color, L^*a^*b^*In space, (a^*)²+ (B^*)²The value of is preferably 50 or less, more preferably 18 or less, and still more preferably 5 or less.
[0139]
The toner image receiving layer preferably has a high glossiness. As the glossiness, the 45 ° glossiness is preferably 60 or more, more preferably 75 or more, and still more preferably 90 or more in the entire region from white without toner to black having the maximum density.
However, the glossiness is preferably 110 or less. When the glossiness exceeds 110, it becomes like metallic luster, which is not preferable for image quality.
The glossiness can be measured based on JIS Z8741.
[0140]
The toner image receiving layer preferably has high smoothness. As the smoothness, the arithmetic average roughness (Ra) is preferably 3 μm or less, more preferably 1 μm or less, and even more preferably 0.5 μm or less in the entire region from white without toner to black having the maximum density.
The arithmetic average roughness can be measured based on JIS B0601, JIS B0651, and JIS B0652.
[0141]
The toner image-receiving layer preferably has physical properties of one of the following items, more preferably a plurality of items, and most preferably all physical properties.
(1) Tm (melting temperature) of the toner image-receiving layer is preferably 30 ° C. or higher, and more preferably Tm + 20 ° C. or lower of the toner.
(2) The toner image receiving layer has a viscosity of 1 × 10⁵The temperature at which cp is reached is preferably 40 ° C. or higher, and more preferably lower than that of the toner.
(3) The storage elastic modulus (G ′) at the fixing temperature of the toner image receiving layer is 1 × 10.²~ 1x10⁵Pa is preferred. Loss elastic modulus (G ″) is 1 × 10²~ 1x10⁵Pa is preferred.
(4) The loss tangent (G ″ / G ′), which is the ratio of the loss elastic modulus (G ″) at the fixing temperature of the toner image-receiving layer and the storage elastic modulus (G ′), is preferably from 0.01 to 10.
(5) The storage elastic modulus (G ′) at the fixing temperature of the toner image-receiving layer is preferably −50 to +2500 with respect to the storage elastic modulus (G ″) at the fixing temperature of the toner.
(6) The inclination angle of the molten toner on the toner image-receiving layer is preferably 50 degrees or less, and more preferably 40 degrees or less.
The toner image-receiving layer preferably satisfies the physical properties disclosed in Japanese Patent No. 2788358, Japanese Patent Application Laid-Open Nos. 7-248637, 8-305067, 10-239889, and the like. .
[0142]
As the toner image-receiving layer, 1 × 10⁶~ 1x10¹⁵Ω / cm²It is preferable to have a surface electrical resistance in the range of (under conditions of 25 ° C. and 65% RH).
The surface resistance is 1 × 10⁶Ω / cm²If the ratio is less than 1, the amount of toner when the toner is transferred to the toner image-receiving layer is not sufficient, and the density of the resulting toner image tends to be low.¹⁵Ω / cm²Exceeding this may generate more charge than necessary during transfer, and the toner may not be sufficiently transferred, resulting in low image density and electrostatic charge during the handling of the electrophotographic image-receiving sheet, which may cause dust to adhere. . Misfeeds, double feeds, discharge marks, toner transfer missing, etc. may occur during copying.
[0143]
The surface electrical resistance of the surface opposite to the toner image-receiving layer with respect to the support is 5 × 10.⁸~ 3.2 × 10¹⁰Ω / cm²1 × 10 is preferred⁹~ 1x10¹⁰Ω / cm²Is more preferable.
Here, the surface electrical resistance is measured in accordance with JIS K6911. The sample is conditioned for 8 hours or more in an environment of temperature 20 ° C. and humidity 65%, and R8340 manufactured by Advantest Corporation is used in the same environment. In addition, the measurement can be performed after 1 minute has passed since energization under the condition of an applied voltage of 100V.
[0144]
-Other layers-
Examples of the other layers include a surface protective layer, a back layer, an intermediate layer, an adhesion improving layer, an undercoat layer, a cushion layer, a charge control (prevention) layer, a reflective layer, a tint adjusting layer, a storage stability improving layer, and an adhesive. Examples include a prevention layer, an anti-curl layer, and a smoothing layer. These layers may be composed of a single layer or may be composed of two or more layers.
[0145]
The surface protective layer is used for the purpose of protecting the surface of the electrophotographic image-receiving sheet, improving storage stability, improving handleability, imparting writing properties, improving instrument passability, imparting anti-offset properties, and the like. It can be provided on the surface of the image receiving layer. The surface protective layer may be a single layer or may be composed of two or more layers. In the surface protective layer, various thermoplastic resins, thermosetting resins and the like can be used as a binder, and it is preferable to use the same type of resin as the toner image receiving layer. However, thermodynamic characteristics, electrostatic characteristics, and the like do not have to be the same as those of the toner image-receiving layer, and can be optimized.
[0146]
The surface protective layer may contain the various additives described above that can be used for the toner image-receiving layer. In particular, the surface protective layer can be blended with other additives such as a matting agent in addition to the release agent used in the present invention. In addition, as said mat agent, various well-known things are mentioned.
The outermost surface layer in the electrophotographic image-receiving sheet (for example, the surface protective layer when a surface protective layer is formed) preferably has good compatibility with the toner from the viewpoint of fixability. Specifically, the contact angle with the melted toner is preferably, for example, 0 to 40 degrees.
[0147]
In the electrophotographic image-receiving sheet, the back layer is provided on the opposite side of the toner image-receiving layer with respect to the support for the purpose of imparting backside output suitability, improving backside output image quality, improving curl balance, and improving device passability. It is preferred that
Although there is no restriction | limiting in particular as a color of the said back layer, When the said electrophotographic image receiving sheet is a double-sided output type image receiving paper which forms an image also in a back surface, it is preferable that a back layer is also white. The whiteness and the spectral reflectance are preferably 85% or more like the surface.
Further, the back layer may have the same structure as that of the toner image receiving layer for improving the duplex output suitability. Various additives described above can be used for the back layer. As such an additive, it is particularly suitable to blend a matting agent, a charge adjusting agent and the like. The back layer may have a single layer configuration or a stacked configuration of two or more layers.
Further, in order to prevent offset at the time of fixing, when a releasable oil is used for the fixing roller or the like, the back layer may be oil absorbing.
[0148]
The adhesion improving layer is preferably formed for the purpose of improving the adhesion between the support and the toner image receiving layer in the electrophotographic image receiving paper. The above-mentioned various additives can be blended in the adhesion improving layer, and it is particularly preferable to blend a crosslinking agent. The electrophotographic image-receiving sheet is preferably further provided with a cushion layer or the like between the adhesion improving layer and the toner image-receiving layer in order to improve toner acceptability.
[0149]
The intermediate layer is formed, for example, between the support and the adhesion improving layer, between the adhesion improving layer and the cushion layer, between the cushion layer and the toner image receiving layer, and between the toner image receiving layer and the storage stability improving layer. Can do. Of course, in the case of an electrophotographic image-receiving sheet comprising a support, a toner image-receiving layer, and an intermediate layer, the intermediate layer can be present, for example, between the support and the toner image-receiving layer.
[0150]
〔toner〕
The electrophotographic material is used with a toner receiving layer receiving toner in printing or copying.
The toner contains at least a binder resin and a colorant, and if necessary, a release agent and other components.
[0151]
-Toner binder resin-
Examples of the binder resin include styrenes such as styrene and parachlorostyrene; vinyl esters such as vinyl naphthalene, vinyl chloride, vinyl bromide, vinyl fluoride, vinyl acetate, vinyl propionate, vinyl benzoate, and vinyl butyrate; Methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, dodecyl acrylate, n-octyl acrylate, 2-chloroethyl acrylate, phenyl acrylate, methyl α-chloroacrylate, methyl methacrylate, methacryl Methylene aliphatic carboxylic acid esters such as ethyl acetate and butyl methacrylate; Vinyl nitriles such as acrylonitrile, methacrylonitrile, and acrylamide; Vinyl ethers such as vinyl methyl ether, vinyl ethyl ether, and vinyl isobutyl ether Tells; N-vinyl compounds such as N-vinyl pyrrole, N-vinyl carbazole, N-vinyl indole, N-vinyl pyrrolidone; single weight of vinyl monomers such as vinyl carboxylic acids such as methacrylic acid, acrylic acid and cinnamic acid Copolymers, copolymers thereof, and various polyesters can be used, and various waxes can be used in combination.
Among these resins, it is preferable to use a resin of the same system as that used for the toner image receiving layer.
[0152]
-Toner Colorant-
As the colorant, those usually used in toners can be used without limitation. For example, carbon black, chrome yellow, hansa yellow, benzidine yellow, sren yellow, quinoline yellow, permanent orange GTR, pyrazolone. Orange, Vulcan Orange, Watch Young Red, Permanent Red, Brilliantamine 3B, Brilliantamine 6B, Daypon Oil Red, Pyrazolone Red, Risor Red, Rhodamine B Lake, Lake Red C, Rose Bengal, Aniline Blue, Ultramarine Blue, Calco Examples include various pigments such as oil blue, methylene blue chloride, phthalocyanine blue, phthalocyanine green, and malachite green oxalelate. Acridine, xanthene, azo, benzoquinone, azine, anthraquinone, thioindico, dioxazine, thiazine, azomethine, indico, thioindico, phthalocyanine, aniline black, polymethine, triphenyl Examples include various dyes such as methane, diphenylmethane, thiazine, thiazole, and xanthene. These colorants may be used alone or in combination of two or more.
The content of the colorant is preferably in the range of 2 to 8% by mass. If the content of the colorant is 2% by mass or more, the coloring power is not weakened. On the other hand, if it is 8% by mass or less, the transparency is not impaired, which is preferable.
[0153]
-Toner release agent-
As the mold release agent, all known waxes can be used in principle, but polar waxes containing nitrogen such as relatively low molecular weight high crystalline polyethylene wax, Fischer-Tropsch wax, amide wax, urethane compound, etc. Etc. are particularly effective. The polyethylene wax preferably has a molecular weight of 1000 or less, and more preferably in the range of 300 to 1000.
[0154]
The compound having a urethane bond is suitable because even if it has a low molecular weight, the solid state can be maintained and the melting point can be set high for the molecular weight due to the strength of cohesive force due to the polar group. The preferred range of molecular weight is 300-1000. The raw materials are a combination of diisocyanate compounds and monoalcohols, a combination of monoisocyanic acid and monoalcohol, a combination of dialcohols and monoisocyanic acid, a combination of trialcohols and monoisocyanic acid, triisocyanic acid Various combinations such as combinations of compounds and monoalcohols can be selected, but in order not to increase the molecular weight, it is preferable to combine a compound of a polyfunctional group and a monofunctional group, and an equivalent functional group amount. It is important to ensure that
[0155]
Specific examples of the raw material compound include monoisocyanate compounds such as dodecyl isocyanate, phenyl isocyanate and derivatives thereof, naphthyl isocyanate, hexyl isocyanate, benzyl isocyanate, butyl isocyanate, and allyl isocyanate. It is done.
Examples of the diisocyanate compound include tolylene diisocyanate, 4,4'diphenylmethane diisocyanate, toluene diisocyanate, 1,3-phenylene diisocyanate, hexamethylene diisocyanate, 4-methyl-m-phenylene diisocyanate, and isophorone diisocyanate. Can be mentioned.
As the monoalcohol, it is possible to use very common alcohols such as methanol, ethanol, propanol, butanol, pentanol, hexanol, and heptanol.
Among the raw material compounds, as the dialcohols, a number of glycols such as ethylene glycol, diethylene glycol, triethylene glycol, trimethylene glycol; as the trialcohols, trimethylolpropane, triethylolpropane, trimethanolethane, etc. can be used. However, it is not necessarily limited to this range.
[0156]
These urethane compounds can be mixed with a resin and a colorant at the time of kneading and used as a kneaded and pulverized toner as in a normal release agent. Also, when used in the emulsion polymerization aggregation melting toner described above, it is dispersed in water together with a polymer electrolyte such as an ionic surfactant, a polymer acid or a polymer base, and heated to a melting point or higher to produce a homogenizer or pressure discharge. A fine dispersion is obtained by applying strong shearing with a mold disperser to prepare a release agent particle dispersion of 1 μm or less, which can be used together with a resin particle dispersion, a colorant dispersion and the like.
[0157]
-Toner and other components-
Further, the toner of the present invention may contain other components such as an internal additive, a charge control agent, and inorganic fine particles. As the internal additive, a magnetic material such as a metal such as ferrite, magnetite, reduced iron, cobalt, nickel, manganese, an alloy, or a compound containing these metals can be used.
[0158]
As the charge control agent, various commonly used charge control agents such as quaternary ammonium salt compounds, nigrosine compounds, dyes composed of complexes of aluminum, iron, chromium, and triphenylmethane pigments may be used. it can. A material that is difficult to dissolve in water is preferable from the viewpoint of controlling the ionic strength that affects the stability during aggregation and melting and reducing wastewater contamination.
[0159]
Examples of the inorganic fine particles include silica, alumina, titania, calcium carbonate, magnesium carbonate, and tricalcium phosphate. Usually, all external additives on the toner surface are used, and these are used as ionic surfactants or polymer acids. It is preferable to use it dispersed in a polymer base.
[0160]
Furthermore, a surfactant can be used for emulsion polymerization, seed polymerization, pigment dispersion, resin particle dispersion, mold release dispersion, aggregation, and stabilization thereof. For example, anionic surfactants such as sulfate ester, sulfonate, phosphate, and soap, cationic surfactants such as amine salt type and quaternary ammonium salt type, polyethylene glycol type, alkylphenol It is also effective to use a nonionic surfactant such as an ethylene oxide adduct system or a polyhydric alcohol system in combination. As a dispersing means at that time, a general means such as a rotary shear type homogenizer, a ball mill having a media, a sand mill, a dyno mill or the like can be used.
[0161]
An external additive may be further added to the toner as necessary. Examples of the external additive include inorganic powder and organic particles. Examples of the inorganic particles include SiO.₂TiO₂, Al₂O₃, CuO, ZnO, SnO₂, Fe₂O₃, MgO, BaO, CaO, K₂O, Na₂O, ZrO₂, CaO · SiO₂, K₂O. (TiO₂)_n, Al₂O₃・ 2SiO₂, CaCO₃, MgCO₃, BaSO₄, MgSO₄Etc. can be illustrated. Moreover, as said organic particle, resin powder, such as powders, such as fatty acid or its derivative (s), these metal salts, fluorine resin, a polyethylene resin, an acrylic resin, can be used. For example, the average particle size of these powders is preferably 0.01 to 5 μm, and more preferably 0.1 to 2 μm.
[0162]
The method for producing the toner is not particularly limited, and (i) a step of forming aggregated particles in a dispersion obtained by dispersing resin particles to prepare an aggregated particle dispersion, (ii) in the aggregated particle dispersion. A step of adding and mixing a fine particle dispersion in which fine particles are dispersed to adhere the fine particles to the aggregated particles to form adhered particles; and (iii) heating and fusing the adhered particles to form toner particles. Those obtained by a method for producing a toner including the steps are preferable.
[0163]
-Toner physical properties-
The volume average particle size of the toner of the present invention is preferably from 0.5 μm to 10 μm.
If the volume average particle size of the toner is too small, there may be an adverse effect on toner handling (replenishability, cleaning properties, fluidity, etc.), and particle productivity may be reduced. On the other hand, if the volume average particle diameter of the toner is too large, the image quality and resolution due to graininess and transferability may be adversely affected.
The toner of the present invention preferably satisfies the volume average particle size range of the toner and has a volume average particle size distribution index (GSDv) of 1.3 or less.
The ratio (GSDv / GSDn) of the volume average particle size distribution index (GSDv) to the number average particle size distribution index (GSDn) is preferably 0.95 or more.
In addition, the toner of the present invention satisfies the volume average particle diameter range of the toner, and the average value of the shape factor represented by the following formula is preferably 1.00 to 1.50.
Shape factor = (π × L²) / (4 × S)
In the above formula, L represents the maximum length of toner particles. S represents the projected area of the toner particles.
When the toner satisfies the above conditions, it is effective for image quality, particularly graininess, and resolution, and it is difficult for transfer and omission to occur, and handling properties are not adversely affected even if the average particle size is not small. Become.
[0164]
The storage elastic modulus G ′ (measured at an angular frequency of 10 rad / sec) at 150 ° C. of the toner itself is suitably 10 to 200 Pa from the viewpoint of improving the image quality and preventing the offset property in the fixing process.
[0165]
<Silver salt photographic material>
As the silver salt photographic material, for example, on the support of the present invention, a silver halide photographic sheet having a constitution in which an image forming layer that develops color at least in YMC is provided and exposed to printing is a plurality of processing tanks. Examples of the silver halide photographic system include color development, bleach-fixing, washing with water, and drying by passing the film while immersing the inside.
[0166]
<Inkjet recording material>
Examples of the ink jet recording material include liquid inks such as water-based inks (using dyes or pigments as coloring materials) and oil-based inks on the support for image recording materials of the present invention, and solids at room temperature. The colorant receiving layer capable of receiving solid ink or the like that is melted and liquefied and used for printing.
[0167]
<Thermal transfer material>
The heat transfer material has, for example, a structure in which at least a heat-meltable ink layer as an image forming layer is provided on the image recording material support of the present invention, and is heated by a heat-sensitive head to heat-melt ink. Examples include a method in which ink is melt-transferred from a layer onto a thermal transfer sheet.
[0168]
<Thermal material>
The thermosensitive material is, for example, a thermoauto having a configuration in which at least a thermochromic layer is provided on the image recording material support of the present invention, and forming an image by repeating heating with a thermal head and fixing with ultraviolet rays. Examples thereof include heat-sensitive materials used in the chrome method (TA method).
[0169]
<Sublimation transfer material>
The sublimation transfer material has, for example, a structure in which an ink layer containing at least a heat diffusible dye (sublimation dye) is provided on the support for image recording material of the present invention, and is heated by a thermal head. And a sublimation transfer method in which a heat-diffusible dye is transferred from an ink layer onto a sublimation transfer sheet.
[0170]
<Printing paper>
The image recording material support is also preferably used as printing paper. When used as printing paper, a material having high mechanical strength is preferable from the viewpoint of applying ink or the like by a printing machine.
[0171]
When a base paper is used as the base paper, it is preferable that the paper contains a filler, a softening agent, an internal additive for papermaking, and the like. As fillers, commonly used ones can be used, for example, clay, calcined clay, diatomaceous earth, talc, kaolin, calcined kaolin, deramikaolin, heavy calcium carbonate, light calcium carbonate, magnesium carbonate, barium carbonate, titanium dioxide. Inorganic fillers such as zinc oxide, silicon oxide, amorphous silica, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, organic fillers such as urea-formalin resin, polystyrene resin, phenol resin, and fine hollow particles , Etc. These may be used alone or in combination of two or more.
[0172]
Examples of the internal additive for papermaking include various conventionally used nonionic, cationic, and anionic yield improvers, freeness improvers, paper strength improvers, and internally added sizing agents. Can be mentioned. Specifically, basic aluminum compounds such as sulfate band, aluminum chloride, sodium aluminate, basic aluminum chloride, basic polyaluminum hydroxide; polyvalent metal compounds such as ferrous sulfate and ferric sulfate, starch , Modified starch, polyacrylamide, urea resin, melamine resin, epoxy resin, polyamide resin, polyamine resin, polyamine, polyethyleneimine, vegetable gum, polyvinyl alcohol, latex, polyethylene oxide and other water-soluble polymers, hydrophilic cross-linked polymer particle dispersion And various compounds such as derivatives and modified products thereof, and these substances simultaneously have some of the functions as an internal additive for papermaking.
[0173]
Next, as the functions of the internal sizing agent, the alkyl ketene dimer compound, alkenyl succinic anhydride compound, styrene-acrylic compound, higher fatty acid compound, petroleum resin sizing agent and rosin sizing agent are used. Is mentioned.
[0174]
Furthermore, internal additives for papermaking such as dyes, fluorescent brighteners, pH adjusters, antifoaming agents, pitch control agents, slime control agents and the like may be appropriately added depending on the intended use.
[0175]
The printing paper is particularly suitable as offset printing paper, and can be used as letterpress printing paper, gravure printing paper, and electrophotographic paper.
[0176]
【Example】
Examples of the present invention will be described below, but the present invention is not limited to these examples.
[0177]
Example 1
Hardwood bleached kraft pulp (LBKP) was beaten with a disc refiner to 300 ml (Canadian standard freeness, CSF) to prepare a pulp stock having a fiber length of 0.58 mm. Based on the pulp weight, the pulp stock is based on 1.2% by weight of cationic starch, 0.5% by weight of alkyl ketene dimer (AKD), 0.3% by weight of anionic polyacrylamide, 0.2% of epoxidized fatty acid amide (EFA). It added so that it might become the ratio of 0.3 mass% of polyamido polyamine epichlorohydrin by mass%. The AKD means an alkyl ketene dimer (the alkyl part is derived from a fatty acid mainly composed of behenic acid). The EFA means an epoxidized fatty acid amide (the fatty acid part is derived from a fatty acid mainly composed of behenic acid).
[0178]
The basis weight of the obtained pulp paper stock is 150 g / m using a long net paper machine.²A base paper was prepared. The speed of the long net paper machine was 400 m / min, and the J / W ratio was 0.98.
The wire of the paper machine was shaken with an amplitude of 25 mm.
In the latter half of the paper machine, a dandy roll having a 55 mesh wire was used.
0.5 g / m of solid component on both sides of the base paper by a size press machine in the middle of the drying zone of the long paper machine²Then, polyvinyl alcohol (PVA) was applied and dried.
At the end of the paper making process, the surface of the base paper (the surface on which the image forming layer is provided) is in contact with the metal roll (surface temperature 110 ° C.), and the back side of the base paper is in contact with the metal roll (surface temperature 40 ° C.). The machine calendering apparatus was arranged and machine calendering processing was performed at a nip pressure of 150 kN / m (153 kgf / cm).
[0179]
Next, after the machine calendering process, the surface of the base paper (the surface on which the image forming layer is provided) is in contact with a metal roll (surface temperature 210 ° C.), and the back side of the base paper is a urethane resin roll (surface temperature 40). The soft calender device was placed so as to be in contact with the heat treatment, and soft calendering was performed at a nip pressure of 210 kN / m (214 kgf / cm).
[0180]
About the obtained base paper, the formation index (aperture 1.0 mm), the change amount of the formation index, the density, and the change amount of the density were measured as follows. The results are shown in Table 1.
-Ground index-
The formation index was measured using a “3-D sheet analyzer” manufactured by M / Ksystem based on the following measurement conditions. The formation index was measured for three base papers, and the average value was shown. In addition, the said formation index shows that formation is so favorable that the value is large.
〔Measurement condition〕
Measurement area: 10cm x 10cm
Number of measurement points: 65536 points
Diaphragm diameter: 1.0 mm
[0181]
-Change in formation index-
The formation index (diaphragm 1.0 mm) before and after contacting water at 20 ° C. for 30 seconds on the surface of the base paper on which the image forming layer is provided was measured in the same manner as described above, and the change in formation index (before contact) The formation index-the contact formation index after contact).
[0182]
-Density-
The density of the base paper was determined by basis weight (JIS-P8124) / thickness (JIS P8118). In addition, the density was measured for three base papers, and the average value was shown.
[0183]
-Change in density-
The density of the base paper before and after contact with water at 20 ° C. for 30 seconds was measured in the same manner as described above to determine the amount of change in density (density before contact−density after contact). It was.
[0184]
(Examples 2-5 and Comparative Examples 1-4)
Except for changing the various conditions in the papermaking process as shown in Tables 1 and 2, the base papers of Examples 2 to 5 and Comparative Examples 1 to 4 were prepared in the same manner as Example 1.
About each obtained base paper, it carried out similarly to Example 1, and measured the density and the formation index. The results are shown in Tables 1 and 2.
[0185]
[Table 1]
Properties of pulp raw materials and base paper

[0186]
[Table 2]
Each setting condition in the paper making process

[0187]
(Examples 6 to 10 and Comparative Examples 5 to 8)
Using the base papers of Examples 1 to 5 and Comparative Examples 1 to 4, image receiving papers for electrophotography of Examples 6 to 10 and Comparative Examples 5 to 8 were prepared by the following method.
-Titanium dioxide dispersion-
40.0 g of titanium dioxide (Typaque (registered trademark) A-220, manufactured by Ishihara Sangyo Co., Ltd.), 2.0 g of PVA102 (manufactured by Kuraray Co., Ltd.), and 58.0 g of ion-exchanged water were mixed, and NBK-2 manufactured by Nippon Seiki Seisakusho Was used to prepare a titanium dioxide dispersion (with a titanium dioxide pigment content of 40% by mass).
[0188]
-Preparation of coating solution for toner image-receiving layer-
15.5 g of the above titanium dioxide dispersion, 15.0 g of carnauba wax dispersion (Cerosol 524, manufactured by Chukyo Yushi Co., Ltd.), 100.0 g of polyester resin aqueous dispersion (solid content 30% by mass, KZA-7049, manufactured by Unitika) Then, 2.0 g of a thickener (Alcox E30, manufactured by Meisei Chemical Co., Ltd.), 0.5 g of an anionic surfactant (AOT), and 80 ml of ion-exchanged water were mixed and stirred to prepare a toner image-receiving layer coating solution.
The resulting toner image-receiving layer coating solution had a viscosity of 40 mPa · s and a surface tension of 34 mN / m.
[0189]
-Preparation of coating solution for back layer-
The following components were mixed and stirred to prepare a coating solution for the back layer.
Acrylic resin water dispersion (solid content 30% by mass, Hiloss XBH-997L, manufactured by Seiko Chemical Co., Ltd.) 100.0 g, matting agent (Techpomer MBX-12, manufactured by Sekisui Plastics Co., Ltd.) 5.0 g, release agent ( Hydrin D337, manufactured by Chukyo Yushi Co., Ltd.) 10.0 g, thickener (CMC) 2.0 g, anionic surfactant (AOT) 0.5 g, and ion-exchanged water 80 ml are mixed and stirred for the back layer. A coating solution was prepared.
The viscosity of the obtained coating liquid for back layer was 35 mPa · s, and the surface tension was 33 mN / m.
[0190]
-Coating of back layer and toner image-receiving layer-
The back layer coating liquid on the back surface of each of the base papers of Examples 1 to 5 and Comparative Examples 1 to 4 (the surface on which the toner image receiving layer is not provided) was dried at 9 g / m with a bar coater.²It applied so that it might become, and the back layer was formed.
Further, the toner image-receiving layer coating liquid is applied to the surface of each base paper with a bar coater at a dry mass of 12 g / m 2.²Was applied to form a toner image-receiving layer. The pigment content in the toner image-receiving layer was 5% by mass relative to the thermoplastic resin.
[0191]
The back layer and the toner image receiving layer were coated and then dried online with hot air. In the drying, the drying air volume and temperature were adjusted so that both the back layer and the toner image-receiving layer were dried within 2 minutes after coating. The drying point was the point at which the coating surface temperature was the same as the wet bulb temperature of the drying air.
Next, after drying, a calendar process was performed. The calendering was performed under the condition of a nip pressure of 14.7 kN / m (15 kgf / cm) using a gloss calender and keeping the metal roller at 40 ° C.
[0192]
Each obtained electrophotographic image-receiving paper was cut into A4, and an image was printed using an electrophotographic printer. The printer used was a color laser printer (DocuColor 1250-PF) manufactured by Fuji Xerox Co., Ltd. with the fixing unit as the belt fixing device 1 shown in FIG.
That is, in the belt fixing device 1 shown in FIG. 1, the fixing belt 2 is suspended over the heating roller 3 and the tension roller 5, and the cleaning roller 6 is disposed above the tension roller 5 via the fixing belt 2. Further, a pressure roller 4 is provided below the heating roller 3 via the fixing belt 2. The electrophotographic image-receiving paper having the latent toner image is inserted between the heating roller 3 and the pressure roller 4 from the right side in FIG. 1 and fixed, and then moved on the fixing belt 2, In the process, it is cooled by the cooling device 7 and finally cleaned by the cleaning roller 6.
In the belt fixing device 1, the conveyance speed of the fixing belt 2 is 30 mm / second, and the nip pressure between the heating roller 3 and the pressure roller 4 is 0.2 MPa (2 kgf / cm 2).²The set temperature of the heating roller 3 is 150 ° C., which corresponds to the fixing temperature. The set temperature of the pressure roller 4 was set to 120 ° C.
[0193]
About each obtained electrophotographic print, the image quality and glossiness were evaluated as follows. The results are shown in Table 3.
[0194]
<Image quality>
The image quality of each electrophotographic print was visually observed, and the best image quality was ranked as A and then evaluated as B, C, D, E based on the following criteria.
〔Evaluation criteria〕
A: Very good (effective as a high-quality recording material).
B: Excellent (effective as a high-quality recording material).
C: Intermediate (not possible as a high-quality recording material)
D: Inferior (impossible as a high-quality recording material).
E: Very inferior (impossible as a high-quality recording material).
[0195]
<Glossiness>
The glossiness of each electrophotographic print was visually observed, and the best glossiness was ranked as A and then evaluated as B, C, D, E based on the following criteria.
〔Evaluation criteria〕
A: Very good (effective as a high-quality recording material).
B: Excellent (effective as a high-quality recording material).
C: Intermediate (not possible as a high-quality recording material)
D: Inferior (impossible as a high-quality recording material).
E: Very inferior (impossible as a high-quality recording material).
[0196]
[Table 3]

[0197]
From the results of Table 3, the electrophotographic image receiving papers of Examples 6 to 10 using the image recording material supports of Examples 1 to 5 are superior in gloss and image quality as compared with Comparative Examples 5 to 8. It was recognized that
[0198]
(Examples 11-15 and Comparative Examples 9-12)
-Photographic paper for electrophotography-
40 parts by mass of an acrylic emulsion (glass transition temperature (Tg) = 60 ° C.) as a solid content on the surface (surface) on the side where the image forming layer of each base paper obtained in Examples 1 to 5 and Comparative Examples 1 to 4 is provided , 10 parts by weight of wax emulsion, CaCO₃  Using a gate roll coater, an aqueous polymer coating solution obtained by mixing 40 parts by mass, 10 parts by mass of oxidized starch, and an appropriate amount of water is 4 g / m in solid content.²Each of the aqueous polymer coated supports was prepared by coating and drying.
[0199]
In Examples 6 to 10 and Comparative Examples 5 to 8, Examples 6 to 10 and Comparative Examples were used except that each of the aqueous polymer coated supports was used instead of the base papers of Examples 1 to 5 and Comparative Examples 1 to 4. In the same manner as in Examples 5 to 8, each of the electrophotographic image-receiving papers of Examples 11 to 15 and Comparative Examples 9 to 12 was produced.
[0200]
About each obtained electrophotographic image-receiving paper, image quality and glossiness were evaluated in the same manner as in Examples 6 to 10 and Comparative Examples 5 to 8. The results are shown in Table 4.
[0201]
[Table 4]

[0202]
(Examples 16-20 and Comparative Examples 13-16)
-Photographic paper-
TiO on the surface (front surface) on which the image forming layer of each base paper prepared in Examples 1 to 5 and Comparative Examples 1 to 4 is provided₂LDPE containing 10% by mass was extrusion coated to a thickness of 25 μm. On the other hand, on the surface (back surface) of each base paper on which the image forming layer is provided, polyethylene (PE) of LDPE / HDPE = 1/1 (mass ratio) is extrusion-coated so that the thickness becomes 20 μm, and double-sided polyethylene resin A coated support was prepared. The surface (LDPE surface side) of the double-sided polyethylene resin-coated support is subjected to corona discharge treatment, and gelatin is 0.1 g / m.²It applied and produced each support for photographic paper.
[0203]
A silver halide gelatin emulsion layer (10 g / m2) was formed on the gelatin coated surface of each photographic paper support thus obtained.²), Gelatin intermediate layer, magenta colored silver halide gelatin emulsion layer for color photography (10 g / m)²), Gelatin intermediate layer, cyan halide color emulsion silver halide emulsion layer (10 g / m)²), A gelatin protective layer was applied in this order to produce photographic photographic papers of Examples 16 to 20 and Comparative Examples 13 to 16.
[0204]
Each obtained photographic paper was exposed and developed to obtain a photographic print. The surface smoothness (fine irregularities (1 mm or less)) and surface smoothness (waviness irregularities (5 to 6 mm)) of the screen of each photographic print were evaluated by the following methods. The results are shown in Table 5.
[0205]
<Surface smoothness (micro unevenness (1 mm or less)>
Each photographic print was visually observed, and based on the following criteria, the best surface smoothness (micro unevenness (1 mm or less)) was ranked as A, and then ranked as B, C, D, E and evaluated. .
〔Evaluation criteria〕
A: Very good (effective as a high-quality recording material).
B: Excellent (effective as a high-quality recording material).
C: Intermediate (not possible as a high-quality recording material)
D: Inferior (impossible as a high-quality recording material).
E: Very inferior (not possible as a high-quality recording material).
[0206]
<Surface smoothness (undulation unevenness (5 to 6 mm)>
Each photographic print was visually observed, and based on the following criteria, the best surface smoothness (waviness unevenness (5-6 mm)) was ranked as A, then B, C, D, E and evaluated. did.
〔Evaluation criteria〕
A: Very good (effective as a high-quality recording material).
B: Excellent (effective as a high-quality recording material).
C: Intermediate (not possible as a high-quality recording material)
D: Inferior (impossible as a high-quality recording material).
E: Very inferior (not possible as a high-quality recording material).
[0207]
[Table 5]

[0208]
From the results of Table 5, the photographic printing papers of Examples 16 to 20 using the support for image recording material having the base papers of Examples 1 to 5 have any minute unevenness and undulation unevenness as compared with Comparative Examples 13 to 16. It was also confirmed that the surface smoothness was excellent.
[0209]
【The invention's effect】
According to the present invention, it is possible to provide a support for an image recording material that can solve the problems in the prior art and that is excellent in smoothness and can form a high-quality image at the same level as a silver salt photograph.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a belt fixing device in a printer used in an embodiment.
[Explanation of symbols]
1 Belt fixing device
2 Fixing belt
3 Heating roller
4 Pressure roller
5 Tension roller
6 Cleaning roller
7 Cooling device

Claims (14)

In a support for image recording material containing at least a base paper,
Wherein Ri der formation index (aperture 1.0mm) is 80 or more in the base paper, and is the density of the base paper is 0.95 g / cm ³ or more,
A support for an image recording material, which is subjected to a soft calender treatment so that a metal roll having a surface temperature of 140 ° C. or higher is in contact with the image forming layer side of the base paper .   Change amount of formation index (diaphragm 1.0 mm) before and after contact with water at 20 ° C. for 30 seconds on the surface of the support on which the image forming layer is provided (ground index before contact−ground after contact) The support for an image recording material according to claim 1, wherein the composite index is 10 or less. The density change amount (density before contact−density after contact) before and after contact with water at 20 ° C. for 30 seconds on the surface of the support on the side where the image forming layer is provided is 0.05 g / cm ³ or less. The support for an image recording material according to claim 1 . The support for an image recording material according to any one of claims 1 to 3 , wherein the base paper is made using a paper machine having a shake having an amplitude of 10 mm or more. The support for an image recording material according to any one of claims 1 to 4 , wherein the base paper is made using a paper machine having a dandy roll having a 40 to 100 mesh wire. The support for an image recording material according to any one of claims 1 to 5, wherein the base paper is made with a J / W ratio of 0.9 to 1.0. The base paper is made using a paper machine having a calendar having a metal roll having a weight average fiber length of 0.45 to 0.65 mm and a surface temperature of 200 ° C or higher . The support for image recording materials according to any one of the above.   8. At least one selected from a water repellent, a sizing agent, a water resistant agent and a surface treatment agent is applied or impregnated on at least the surface of the base paper on which the image forming layer is provided. Support for image recording material.   9. The support for an image recording material according to claim 1, wherein at least one surface of the base paper is coated with an aqueous polymer-containing coating solution.   The support for an image recording material according to any one of claims 1 to 9, wherein at least one surface of the base paper is coated with a polyolefin resin. A method for producing a support for an image recording material according to any one of claims 1 to 10,
At least a paper making process for making a base paper by making pulp paper stock, wherein in the paper making process, (1) a shaking process using a shake having an amplitude of 10 mm or more, (2) a dandy roll having a 40-100 mesh wire A method for producing a support for an image recording material, comprising performing at least one selected from a dandy roll treatment and (3) a calendar treatment using a calendar having a metal roll having a surface temperature of 140 ° C. or higher.   The method for producing a support for an image recording material according to claim 11, wherein at least one of the shaking process, the dandy roll process, and the calendar process is performed using a long net paper machine.   An image recording material comprising at least the image recording material support according to claim 1 and an image forming layer provided on the support.   The image recording material according to claim 13, which is at least one selected from electrophotographic materials, heat-sensitive materials, inkjet recording materials, sublimation transfer materials, silver salt photographic materials, and thermal transfer materials.

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