JP2002071913A - Reflecting film for surface light source - Google Patents
Reflecting film for surface light sourceInfo
- Publication number
- JP2002071913A JP2002071913A JP2000256105A JP2000256105A JP2002071913A JP 2002071913 A JP2002071913 A JP 2002071913A JP 2000256105 A JP2000256105 A JP 2000256105A JP 2000256105 A JP2000256105 A JP 2000256105A JP 2002071913 A JP2002071913 A JP 2002071913A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- layer
- thermoplastic resin
- polyester
- light source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Liquid Crystal (AREA)
- Laminated Bodies (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、面光源用反射フィ
ルムに関し、詳しくはノートブック型のコンピューター
やワードプロセッサー等の液晶素子を用いた液晶表示装
置のバックライト機構に使用される面光源用反射フィル
ムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflection film for a surface light source, and more particularly to a reflection film for a surface light source used in a backlight mechanism of a liquid crystal display device using a liquid crystal element such as a notebook computer or a word processor. About.
【０００２】[0002]
【従来の技術】近年、ノートブック型のコンピューター
やワードプロセッサー等の表示装置として、薄型化が可
能であり、しかも画像が見易いバックライト機構を有す
る液晶素子を用いた液晶表示装置が用いられている。こ
のようなバックライト機構には、透光性の導光板の一端
部に、蛍光管のような線状光源を併設するエッジライト
方式が多く用いられる。このようなエッジライト方式の
場合には、導光板の一方の面を光拡散物質で部分的に被
覆し、その面の全面をさらに反射材で被覆するようにし
て面光源を構成するものが多い。2. Description of the Related Art In recent years, as a display device such as a notebook type computer or a word processor, a liquid crystal display device using a liquid crystal element having a backlight mechanism which can be made thinner and has an easy-to-view image has been used. For such a backlight mechanism, an edge light method in which a linear light source such as a fluorescent tube is provided at one end of a light-transmitting light guide plate is often used. In the case of such an edge light system, a surface light source is often configured such that one surface of a light guide plate is partially covered with a light diffusing substance, and the entire surface is further covered with a reflective material. .
【０００３】上記のような反射材としては、特開昭６２
−２８６０１９号公報記載のようなアルミニウム板、実
開平４−２２７５５号公報記載のような金属反射板、特
開平８−１１４７９８号公報記載のようなフィルム表面
に銀薄膜を設けたもの、あるいは特開平３−２５６０９
０号公報や特公平８−１６１７５公報に記載されている
ような発泡白色フィルムなどがあった。特に、エッジラ
イト方式のバックライト機構においては、反射板とし
て、軽量且つ、比較的反射指向性の小さい発泡白色フィ
ルムが現在多く用いられている。しかしながら、従来の
発泡白色フィルムは軽量且つ、反射指向性が小さいとい
う優れた特性を有するものの、隠蔽性が劣るためにバッ
クライト装置に組み込んだ際に、液晶表示素子を固定す
るための金属枠の一部や液晶表示を組み込むプラスチッ
ク性のケースの桟等の部位が透けて見え、液晶表示装置
としての品位を損ねるという問題があった。[0003] As a reflector as described above, Japanese Patent Application Laid-Open No. Sho 62
-286019, an aluminum plate as described in Japanese Utility Model Application Laid-Open No. 4-22755, a metal reflection plate as described in JP-A-8-114798, and a film provided with a silver thin film as described in JP-A-8-114798. 3-25609
No. 0 and JP-B-8-16175, etc. In particular, in a backlight mechanism of an edge light system, a light-weight, foamed white film having relatively low reflection directivity is often used as a reflection plate at present. However, the conventional foamed white film is lightweight and has excellent characteristics of low reflection directivity, but has a poor concealing property, so that when it is incorporated in a backlight device, it has a metal frame for fixing a liquid crystal display element. There is a problem that a part or a part of a plastic case into which a liquid crystal display is incorporated can be seen through, thereby deteriorating the quality of the liquid crystal display device.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、発泡白色フ
ィルムの優れた特性を保持しつつ、隠蔽性の高い面光源
用反射フィルムを得ることを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a reflective film for a surface light source having a high concealing property while maintaining the excellent characteristics of a foamed white film.
【０００５】[0005]
【課題を解決するための手段】本発明は次の構成を有す
る。 （１）少なくとも微細な空洞を多数含有するポリエステ
ル系樹脂層を有し、全光線透過率が２％以下であること
を特徴とする面光源用反射フィルム。 （２）入射光側となる面と反対側の面に隠蔽層を有する
ことを特徴とする（１）記載の面光源用反射フィルム。The present invention has the following configuration. (1) A reflective film for a surface light source, comprising a polyester resin layer containing at least a large number of fine cavities and having a total light transmittance of 2% or less. (2) The reflection film for a surface light source according to (1), further comprising a concealing layer on the surface opposite to the surface on the incident light side.
【０００６】なお、本発明において「フィルム」の厚み
は特に限定されず、いわゆる「シート」も含む。In the present invention, the thickness of the "film" is not particularly limited, and includes a so-called "sheet".
【０００７】[0007]
【発明の実施の形態】本発明の面光源用反射フィルム
は、少なくとも微細な空洞を多数含有するポリエステル
系樹脂層を有し、かつ全光線透過率が２％以下である。
全光線透過率を２％以下とすることにより、隠蔽性に優
れ、バックライト装置に組み込んだ際に、液晶表示素子
を固定するための金属枠の一部や液晶表示を組み込むプ
ラスチック性のケースの桟等の部位が透けて見えること
を防止できる。BEST MODE FOR CARRYING OUT THE INVENTION The reflection film for a surface light source of the present invention has a polyester resin layer containing at least many fine cavities, and has a total light transmittance of 2% or less.
By setting the total light transmittance to 2% or less, the concealing property is excellent, and a part of a metal frame for fixing a liquid crystal display element or a plastic case incorporating a liquid crystal display when incorporated in a backlight device is used. It is possible to prevent a part such as a bar from being seen through.
【０００８】本発明の面光源用反射フィルムに使用する
基材は、少なくとも微細な空洞を多数含有するポリエス
テル系樹脂層を有する。上記ポリエステル系樹脂層は、
ポリエステル系樹脂からなり、微細な空洞を多数含有す
ればその構成は特に限定されず、例えば、ポリエステル
系樹脂を、ベースとなるポリエステル系樹脂（ａ）と、
該ポリエステル系樹脂（ａ）に対して非相溶の熱可塑性
樹脂（ｂ）とから構成し、熱可塑性樹脂（ｂ）により空
洞を発現させるものが挙げられる。The substrate used in the reflection film for a surface light source of the present invention has a polyester resin layer containing at least many fine cavities. The polyester resin layer,
The structure is not particularly limited as long as it is made of a polyester-based resin and contains a large number of fine cavities.
A thermoplastic resin (b) that is incompatible with the polyester resin (a), and a cavity is formed by the thermoplastic resin (b).
【０００９】上記ポリエステル系樹脂（ａ）を構成する
ポリエステルとしては、テレフタル酸、イソフタル酸、
ナフタレンジカルボン酸等の芳香族ジカルボン酸、また
はそのエステルと、エチレングリコール、ジエチレング
リコール、１，４−ブタンジオール、ネオペンチルグリ
コールなどのグリコールとを重縮合して得られるポリエ
ステルが挙げられる。かかるポリエステルの代表的なも
のとしては、ポリエチレンテレフタレート、ポリエチレ
ン・ブチレンテレフタレート、ポリブチレンテレフタレ
ート、ポリエチレン−２、６−ナフタレート等が例示さ
れる。これらのポリエステルは単独重合体であってもよ
く、あるいは上記ポリエステルの構成成分以外の第３成
分を共重合せしめた共重合体であっても勿論構わない
が、いずれにしても本発明においては、エチレンテレフ
タレート単位、ブチレンテレフタレート単位、あるいは
エチレン−２，６−ナフタレート単位の占める比率が、
全構成単位に対して７０モル％以上であるのが好まし
く、さらに好ましくは８０モル％以上、特に好ましくは
９０モル％以上であるポリエステルがよい。As the polyester constituting the polyester resin (a), terephthalic acid, isophthalic acid,
A polyester obtained by polycondensing an aromatic dicarboxylic acid such as naphthalenedicarboxylic acid or an ester thereof with a glycol such as ethylene glycol, diethylene glycol, 1,4-butanediol, or neopentyl glycol is exemplified. Representative examples of such polyesters include polyethylene terephthalate, polyethylene butylene terephthalate, polybutylene terephthalate, polyethylene-2,6-naphthalate, and the like. These polyesters may be a homopolymer, or may be a copolymer obtained by copolymerizing a third component other than the above-mentioned polyester components, but in any case, in the present invention, The ratio of ethylene terephthalate units, butylene terephthalate units, or ethylene-2,6-naphthalate units is
The polyester is preferably at least 70 mol%, more preferably at least 80 mol%, particularly preferably at least 90 mol%, based on all constituent units.
【００１０】上記ポリエステルは、芳香族ジカルボン酸
とグリコールとを直接反応させる方法の他、芳香族ジカ
ルボン酸のアルキルエステルとグリコールとをエステル
交換反応させた後重縮合させたり、あるいは芳香族ジカ
ルボン酸のジグリコールエステルを重縮合させる方法等
によって製造することもできる。The polyester may be prepared by a method of directly reacting an aromatic dicarboxylic acid with a glycol, a transesterification reaction between an alkyl ester of the aromatic dicarboxylic acid and a glycol, followed by polycondensation, or a method of reacting an aromatic dicarboxylic acid with a glycol. It can also be produced by a method of polycondensing a diglycol ester.
【００１１】上記ポリエステル系樹脂（ａ）に対して非
相溶の熱可塑性樹脂（ｂ）は、ベースとなるポリエステ
ル系樹脂（ａ）に対して非相溶であって、ポリエステル
系樹脂（ａ）中に分散状態で均一に混入し、フィルムの
延伸等によりにポリエステル系樹脂（ａ）との界面で剥
離を起こして空洞を発現させるものであれば特に限定さ
れない。好ましくは、ポリスチレン系樹脂、ポリオレフ
ィン系樹脂、ポリアクリル系樹脂、ポリカーボネート系
樹脂、ポリスルホン系樹脂、セルロース系樹脂などが挙
げられる。これらは単独で使用し得る他、必要により２
種以上を複合して使用することもできる。中でもポリス
チレン系樹脂、ポリメチルペンテンやポリプロピレン等
のポリオレフィン系樹脂の使用が特に好ましい。The thermoplastic resin (b) which is incompatible with the polyester resin (a) is incompatible with the base polyester resin (a), and the polyester resin (a) The material is not particularly limited as long as it is uniformly mixed in a dispersed state and causes peeling at the interface with the polyester-based resin (a) due to stretching of the film or the like so as to develop cavities. Preferably, polystyrene-based resins, polyolefin-based resins, polyacryl-based resins, polycarbonate-based resins, polysulfone-based resins, cellulose-based resins and the like are exemplified. These can be used alone or, if necessary,
More than one species can be used in combination. Among them, the use of polystyrene resins and polyolefin resins such as polymethylpentene and polypropylene is particularly preferred.
【００１２】上記熱可塑性樹脂（ｂ）のポリエステル系
樹脂（ａ）に対する配合量は、得られる上記ポリエステ
ル系樹脂層に求められる空洞形成量や物性、延伸等の製
造条件などに応じて適宜設定するが、ポリエステル系樹
脂（ａ）と熱可塑性樹脂（ｂ）とからなる樹脂組成物全
量に対し、熱可塑性樹脂（ｂ）が好ましくは３重量％以
上〜４０重量％未満、さらに好ましくは５〜３０重量％
範囲であるのがよい。熱可塑性樹脂（ｂ）の配合量が、
３重量％未満であると、生成する空洞量が少なく、本発
明の面光源用反射フィルムの反射性能、特に熱線反射性
能が向上しにくく、一方４０重量％以上になると、製造
時の延伸性が著しく低下する他、耐熱性、強度あるいは
腰の強さも低下しやすい。The amount of the thermoplastic resin (b) to be mixed with the polyester resin (a) is appropriately set according to the amount of voids required for the obtained polyester resin layer, physical properties, production conditions such as stretching, and the like. However, the thermoplastic resin (b) is preferably at least 3% by weight to less than 40% by weight, more preferably 5 to 30% by weight, based on the total amount of the resin composition comprising the polyester resin (a) and the thermoplastic resin (b). weight%
It should be a range. The blending amount of the thermoplastic resin (b) is
When the amount is less than 3% by weight, the amount of cavities generated is small, and the reflection performance of the reflective film for a surface light source of the present invention, particularly, the heat ray reflection performance is hardly improved. In addition to the remarkable decrease, the heat resistance, the strength and the strength of the waist tend to decrease.
【００１３】さらに熱可塑性樹脂（ｂ）は、上記ポリエ
ステル系樹脂（ａ）に対して非相溶の熱可塑性樹脂（ｂ
１）と、上記ポリエステル系樹脂（ａ）および上記熱可
塑性樹脂（ｂ１）の両方に対して非相溶であり、且つ上
記熱可塑性樹脂（ｂ１）よりも表面張力（表面エネルギ
ー）の大きい熱可塑性樹脂（ｂ２）から構成するのが好
ましい。Further, the thermoplastic resin (b) is a thermoplastic resin (b) which is incompatible with the polyester resin (a).
1) and a thermoplastic resin which is incompatible with both the polyester resin (a) and the thermoplastic resin (b1) and has a higher surface tension (surface energy) than the thermoplastic resin (b1). It is preferred to be composed of resin (b2).
【００１４】熱可塑性樹脂（ｂ）を上記のような２種の
熱可塑性樹脂（ｂ１）および熱可塑性樹脂（ｂ２）から
構成することにより、熱可塑性樹脂（ｂ１）が主に空洞
発現作用を発揮する「空洞発現剤」となるのに対して、
熱可塑性樹脂（ｂ２）は熱可塑性樹脂（ｂ１）に対して
も非相溶であり、且つ熱可塑性樹脂（ｂ１）よりも表面
張力が大きいため、ポリエステル系樹脂（ａ）に対する
空洞発現作用に加えて、ポリエステル系樹脂（ａ）に対
して熱可塑性樹脂（ｂ１）を微細分散させる「分散作
用」を有効に発揮し、ひいては微細な空洞を均一に形成
せしめる作用を有する「分散性樹脂」となる。By forming the thermoplastic resin (b) from the above two kinds of thermoplastic resin (b1) and the thermoplastic resin (b2), the thermoplastic resin (b1) mainly exerts a cavity generating effect. To become a “cavity developing agent”,
The thermoplastic resin (b2) is incompatible with the thermoplastic resin (b1) and has a higher surface tension than the thermoplastic resin (b1). As a result, a “dispersing action” of effectively dispersing the thermoplastic resin (b1) in the polyester-based resin (a) is achieved, thereby providing a “dispersing resin” having an action of uniformly forming fine cavities. .
【００１５】上記熱可塑性樹脂（ｂ１）と熱可塑性樹脂
（ｂ２）の組合せは、共にポリエステル系樹脂（ａ）に
対して非相溶であり、可塑性樹脂（ｂ１）よりも熱可塑
性樹脂（ｂ２）の表面張力（表面エネルギー）が大きけ
れば特に限定されないが、例えば以下のようなものが挙
げられる。熱可塑性樹脂（ｂ１）として、ポリメチルペ
ンテン系樹脂、ポリプロピレン系樹脂、環状オレフィン
ポリマー等のポリオレフィン系樹脂や、シリコーン系樹
脂等を用いた場合には、熱可塑性樹脂（ｂ２）として、
ポリスチレン系樹脂、ポリカーボネート系樹脂、ポリア
クリル系樹脂、ポリフェニレンエーテル系樹脂、マレイ
ミドやカルボン酸等で変性したポリオレフィン系樹脂や
ポリスチレン系樹脂等を用いるのが好ましい。あるい
は、熱可塑性樹脂（ｂ１）としてポリスチレン系樹脂を
用いた場合は、熱可塑性樹脂（ｂ２）として、ポリカー
ボネート系樹脂、ポリアクリル系樹脂、ポリフェニレン
エーテル系樹脂、マレインイミドやカルボン酸等で変性
したポリオレフィン系樹脂を用いるのが好ましい。さら
に、上記熱可塑性樹脂（ｂ１）と熱可塑性樹脂（ｂ２）
はそれぞれ１種の樹脂を単独で使用し得る他、必要によ
り２種以上の樹脂を混合して使用することも可能であ
る。The combination of the thermoplastic resin (b1) and the thermoplastic resin (b2) is incompatible with the polyester resin (a), and the thermoplastic resin (b2) is more soluble than the thermoplastic resin (b1). The surface tension (surface energy) is not particularly limited as long as it is large, and examples thereof include the following. When a polyolefin-based resin such as polymethylpentene-based resin, polypropylene-based resin, cyclic olefin polymer, or silicone-based resin is used as the thermoplastic resin (b1), the thermoplastic resin (b2) is
It is preferable to use a polystyrene-based resin, a polycarbonate-based resin, a polyacryl-based resin, a polyphenylene ether-based resin, a polyolefin-based resin modified with a maleimide, a carboxylic acid, or the like, a polystyrene-based resin, or the like. Alternatively, when a polystyrene resin is used as the thermoplastic resin (b1), a polycarbonate resin, a polyacrylic resin, a polyphenylene ether resin, a polyolefin modified with maleimide, carboxylic acid, or the like is used as the thermoplastic resin (b2). It is preferable to use a system resin. Further, the thermoplastic resin (b1) and the thermoplastic resin (b2)
Can be used alone or in combination of two or more resins, if necessary.
【００１６】熱可塑性樹脂（ｂ１）と熱可塑性樹脂（ｂ
２）の配合量は、ポリエステル系樹脂（ａ）に対して所
望の空洞形成作用が得られれば特に限定されないが、好
ましくは、熱可塑性樹脂（ｂ１）１００重量部に対し
て、熱可塑性樹脂（ｂ２）０．０１〜２０重量部となる
ようにするのが好ましい。熱可塑性樹脂（ｂ１）１００
重量部に対する、熱可塑性樹脂（ｂ２）の配合量の下限
は、さらに好ましくは０．０２重量部、特に好ましくは
０．１重量部とするのが良く、熱可塑性樹脂（ｂ２）の
配合量の上限は、さらに好ましくは１５重量部、特に好
ましくは１０重量部とするのが良い。The thermoplastic resin (b1) and the thermoplastic resin (b
The blending amount of 2) is not particularly limited as long as a desired void-forming action is obtained with respect to the polyester resin (a), but preferably, the thermoplastic resin (b1) is mixed with 100 parts by weight of the thermoplastic resin (b1). b2) It is preferred that the amount be 0.01 to 20 parts by weight. Thermoplastic resin (b1) 100
The lower limit of the amount of the thermoplastic resin (b2) relative to parts by weight is more preferably 0.02 parts by weight, particularly preferably 0.1 part by weight. The upper limit is more preferably 15 parts by weight, particularly preferably 10 parts by weight.
【００１７】熱可塑性樹脂（ｂ１）１００重量部に対す
る、熱可塑性樹脂（ｂ２）の配合量が０．０１重量部未
満では、「分散性樹脂」として熱可塑性樹脂（ｂ１）を
微細分散させる作用が得られにくく、一方２０重量部を
超えると、熱可塑性樹脂（ｂ２）が熱可塑性樹脂（ｂ
１）の大部分を被覆し、厚さに比較して長さの短い空洞
が形成される等、所望の大きさの空洞が得られにくくな
る。熱可塑性樹脂（ｂ１）と熱可塑性樹脂（ｂ２）の配
合割合を上記範囲とすることにより、表面張力の大きい
熱可塑性樹脂（ｂ２）が、表面張力の小さい熱可塑性樹
脂（ｂ１）を部分的に被覆、あるいは全体を薄く被覆す
ることになり、ポリエステル系樹脂（ａ）に対する熱可
塑性樹脂（ｂ１）の接着性への影響が無視できる程度と
なる。従って、熱可塑性樹脂（ｂ２）の微細分散効果が
有効に発現し、熱可塑性樹脂（ｂ１）をポリエステル系
樹脂（ａ）中に微細分散化できて、後述のように厚さに
対して長い空洞を多数得ることができる。なお、ポリエ
ステル系樹脂（ａ）中において、熱可塑性樹脂（ｂ２）
が熱可塑性樹脂（ｂ１）を被覆する状態は特に限定され
ず、例えば網目状など規則的に被覆部分と非被覆部分が
存在する状態や、無秩序に被覆部分が存在する状態、全
体を薄く被覆する状態、さらには上記の状態が複数共存
する状態などが挙げられる。If the amount of the thermoplastic resin (b2) is less than 0.01 part by weight per 100 parts by weight of the thermoplastic resin (b1), the effect of finely dispersing the thermoplastic resin (b1) as a "dispersible resin" is not obtained. On the other hand, if it exceeds 20 parts by weight, the thermoplastic resin (b2) becomes
It is difficult to obtain a cavity having a desired size, for example, by covering most of 1) and forming a cavity having a length shorter than the thickness. By setting the mixing ratio of the thermoplastic resin (b1) and the thermoplastic resin (b2) within the above range, the thermoplastic resin (b2) having a large surface tension partially replaces the thermoplastic resin (b1) having a small surface tension. The coating or the whole is thinly coated, and the influence on the adhesiveness of the thermoplastic resin (b1) to the polyester resin (a) is negligible. Therefore, the fine dispersion effect of the thermoplastic resin (b2) is effectively exhibited, and the thermoplastic resin (b1) can be finely dispersed in the polyester-based resin (a). Can be obtained in large numbers. In the polyester resin (a), the thermoplastic resin (b2)
There is no particular limitation on the state in which the resin is coated with the thermoplastic resin (b1). For example, a state in which a coated part and an uncoated part are present regularly, such as a mesh, a state in which the coated part is randomly distributed, and a state in which the whole is thinly coated. A state, or a state in which a plurality of the above states coexist, may be mentioned.
【００１８】熱可塑性樹脂（ｂ）を上記のような２種の
熱可塑性樹脂（ｂ１）および熱可塑性樹脂（ｂ２）から
構成する場合、熱可塑性樹脂（ｂ１）と熱可塑性樹脂
（ｂ２）のポリエステル系樹脂（ａ）中への配合量は、
本発明の面光源用反射フィルムに求められる特性、特に
ポリエステル系樹脂層における空洞形成量や上記ポリエ
ステル系樹脂層製造時の延伸条件などによって適宜設定
すればよいが、上記ポリエステル系樹脂層を主として構
成する、ポリエステル系樹脂（ａ）と熱可塑性樹脂（ｂ
１）と熱可塑性樹脂（ｂ２）の総計に対し、熱可塑性樹
脂（ｂ１）と熱可塑性樹脂（ｂ２）の配合量の和が、好
ましくは３〜３０重量％、さらに好ましくは５〜２５重
量％の範囲となるようにするのが良い。熱可塑性樹脂
（ｂ１）と熱可塑性樹脂（ｂ２）の配合量の和が、３重
量％未満では、ポリエステル系樹脂層形成時の延伸工程
で生成する空洞量が少なくなって、可視光領域での反射
率と光散乱性が低下し、一方３０重量％を超えると、ポ
リエステル系樹脂層形成時の延伸性が著しく低下する
他、強度あるいは腰の強さも低下することがある。When the thermoplastic resin (b) is composed of the above two kinds of thermoplastic resins (b1) and (b2), polyester of the thermoplastic resin (b1) and the thermoplastic resin (b2) The compounding amount in the system resin (a) is
The properties required for the surface light source reflective film of the present invention, in particular, the amount of voids formed in the polyester-based resin layer or the stretching conditions during the production of the polyester-based resin layer may be appropriately set, but the polyester-based resin layer mainly comprises The polyester resin (a) and the thermoplastic resin (b)
The sum of the amounts of the thermoplastic resin (b1) and the thermoplastic resin (b2) is preferably 3 to 30% by weight, more preferably 5 to 25% by weight, based on the total amount of 1) and the thermoplastic resin (b2). It is better to be within the range. When the sum of the blending amounts of the thermoplastic resin (b1) and the thermoplastic resin (b2) is less than 3% by weight, the amount of cavities generated in the stretching step at the time of forming the polyester resin layer is reduced, and the visible light range is reduced. If the reflectance and light scattering property are reduced, on the other hand, if it exceeds 30% by weight, the stretchability at the time of forming the polyester-based resin layer is significantly reduced, and the strength or stiffness may also be reduced.
【００１９】本発明において、上記ポリエステル系樹脂
層は、実質的に無機粒子を含有しないのが好ましい。上
記ポリエステル系樹脂層中に無機粒子が存在すると、ポ
リエステル系樹脂層中での光の散乱が強くなりすぎ、光
エネルギーの吸収が大きくなる。In the present invention, the polyester resin layer preferably does not substantially contain inorganic particles. If inorganic particles are present in the polyester-based resin layer, light scattering in the polyester-based resin layer becomes too strong, and absorption of light energy increases.
【００２０】本発明において、ポリエステル系樹脂層に
は必要に応じて、本発明の作用を阻害しない範囲で、他
の成分として蛍光増白剤、帯電防止剤、紫外線吸収剤等
を含有させることは可能である。In the present invention, if necessary, a fluorescent whitening agent, an antistatic agent, an ultraviolet absorber and the like may be contained in the polyester resin layer as long as the action of the present invention is not impaired. It is possible.
【００２１】本発明の面光源用反射フィルムは、その主
体部分が、単層のフィルムであっても、表層と中心層を
有するなどの２層以上の多層構造であっても良い。多層
構造とする場合、本発明の作用を阻害しない範囲で、各
層を同一の構成としても、異なる構成としても良く、例
えば、２層以上の上記ポリエステル系樹脂層のような微
細な空洞を多数含有するポリエステル系樹脂層からなる
構成としても良い。The reflective film for a surface light source of the present invention may have a main part of a single-layer film or a multilayer structure of two or more layers such as a surface layer and a central layer. In the case of a multi-layer structure, each layer may have the same configuration or a different configuration as long as the function of the present invention is not impaired. For example, it contains a large number of fine cavities such as two or more polyester resin layers. It is good also as a structure which consists of a polyester-type resin layer.
【００２２】上記ポリエステル系樹脂層は、見掛け密度
を０．６〜１．３ｇ／ｃｍ3の範囲とすることが好まし
い。見掛け密度が０．６ｇ／ｃｍ3未満のものは、空洞
含有率が高すぎてポリエステル系樹脂層の強度が低下し
たり、ポリエステル系樹脂層表面に割れや皺等が生じ易
くなって商品価値が低下し、逆に１．３ｇ／ｃｍ3を超
える高密度のものは、空洞含有率が低すぎて、所望の可
視光領域の反射特性が得られにくい。The polyester resin layer preferably has an apparent density in the range of 0.6 to 1.3 g / cm 3 . If the apparent density is less than 0.6 g / cm 3 , the void content is too high, and the strength of the polyester-based resin layer is reduced. In the case of a high-density material having a lower density and exceeding 1.3 g / cm 3 , the void content is too low, and it is difficult to obtain a desired reflection characteristic in the visible light region.
【００２３】本発明において、主体となるポリエステル
系樹脂層の形成方法は特に限定されず、一般に使用され
るフィルム形成方法を使用できる。フィルム形成方法と
しては、生産性の点から、基材を構成する材料を混合し
て押出機から押出し、ダイスに導いて未延伸シートを得
た後、該未延伸シートを２軸方向に延伸する方法が最も
好ましい。基材を多層構成とする場合は、各層を同時に
形成しても、別個に形成して積層しても良い。In the present invention, the method of forming the main polyester resin layer is not particularly limited, and a generally used film forming method can be used. As a method of forming a film, from the viewpoint of productivity, the materials constituting the base material are mixed, extruded from an extruder, guided to a die to obtain an unstretched sheet, and then the unstretched sheet is stretched biaxially. The method is most preferred. When the base material has a multilayer structure, each layer may be formed simultaneously or separately formed and laminated.
【００２４】本発明の面光源用反射フィルムにおいて、
全光線透過率を２％以下とする方法は特に限定されず、
上記のような微細な空洞を多数含有するポリエステル系
樹脂層を２層以上積層する方法や、入射光側となる面と
反対側の面に隠蔽層を形成する方法が挙げられる。In the reflection film for a surface light source of the present invention,
The method for reducing the total light transmittance to 2% or less is not particularly limited.
Examples include a method of laminating two or more polyester resin layers containing a large number of fine cavities as described above, and a method of forming a concealing layer on the surface opposite to the surface on the incident light side.
【００２５】本発明の面光源用反射フィルムが隠蔽層を
有する構成とする場合、隠蔽層の素材や形成方法などの
構成は、本発明の面光源用反射フィルムの全光線透過率
が２％以下となるのであれば、特に限定されない。例え
ば、主体となる上記ポリエステル系樹脂フィルムの入射
光側となる面と反対側の面に、金属薄膜層を積層する方
法、金属薄膜層を有するフィルムを積層する方法、炭酸
カルシウム、酸化チタン、ゼオライトなどの無機粒子を
含有する層を積層する方法等が挙げられる。これらの積
層方法は、隠蔽層の構成により適宜選択すれば良く、ま
た、本発明の作用を阻害しない範囲で、主体となるポリ
エステル系樹脂層と隠蔽層の間に粘着層等を有したり、
隠蔽層のさらに外側に保護層等を有するなど他層を有し
ていても良い。When the reflective film for a surface light source of the present invention has a concealing layer, the material such as the concealing layer and the method of forming the concealing layer may be such that the total light transmittance of the reflective film for a surface light source of the present invention is 2% or less. Is not particularly limited. For example, a method of laminating a metal thin film layer, a method of laminating a film having a metal thin film layer on a surface opposite to the surface on the incident light side of the main polyester resin film, calcium carbonate, titanium oxide, zeolite For example, a method of laminating a layer containing inorganic particles such as These laminating methods may be appropriately selected depending on the configuration of the concealing layer, and may have an adhesive layer or the like between the main polyester resin layer and the concealing layer as long as the action of the present invention is not impaired,
It may have another layer such as a protective layer or the like further outside the concealing layer.
【００２６】本発明の面光源用反射フィルムにおいて、
各層の厚みは特に限定されない。In the reflection film for a surface light source of the present invention,
The thickness of each layer is not particularly limited.
【００２７】以下に試験例および実施例を用いて、本発
明の効果をさらに詳細に示すが、本発明はこれらに限定
されるものではなく、本発明の作用を阻害しない範囲
で、変更することは全て本発明の技術的範囲に含まれ
る。 試験例 試験方法 （１）全光線透過率の測定 実施例１，２、比較例１の面光源用反射フィルムについ
て、ヘイズメーター（東京電色工業社製、モデルＴＣ−
Ｈ３ＤＰ）を用いて全光線透過率を測定した。Hereinafter, the effects of the present invention will be described in more detail with reference to Test Examples and Examples. However, the present invention is not limited to these, and changes may be made within a range not to impair the effects of the present invention. Are all included in the technical scope of the present invention. Test example Test method (1) Measurement of total light transmittance The haze meter (manufactured by Tokyo Denshoku Industries Co., Ltd., model TC-) was used for the surface light source reflective films of Examples 1 and 2 and Comparative Example 1.
H3DP) was used to measure the total light transmittance.
【００２８】[0028]
【実施例】実施例１ 下記に示すような組成物を、２軸スクリュー押し出し機
に投入し、Ｔ−ダイスより２９０℃で溶融押し出しした
後、静電気的に冷却回転ロールに密着させ、固化させる
ことにより未延伸シートを得た。次に、該未延伸シート
をロール延伸機にかけ、８０℃で３．１倍に縦延伸を行
った後、テンターにて１２５℃で２．６倍に横延伸する
と共に、更にテンターにて２２０℃で１．４倍延伸し
た。その後、２３５℃で４％の緩和熱処理を施すことに
より、内部に多数の空洞を有する厚さ１８８μｍのポリ
エステル系樹脂フィルム（ポリエステル系樹脂層）を得
た。 ポリエチレンテレフタレート樹脂（固有粘度：０．６２ｄｌ／ｇ） ７４重量％ 一般用ポリスチレン樹脂（ＰＳ） [三井東圧化学（株）製、Ｔ５７５−５７Ｕ] ２５重量％ マレイミド変性ポリスチレン樹脂（Ｍ−ＰＳ） [三井東圧化学（株）製、ＮＨ１２００] １重量％ 次に、上記ポリエステル系樹脂フィルムの一方の面に、
ダイコート方式により粘着剤（Ｘ３９５−２７０Ｓ−
１：サイデン化学社製）をＷＥＴで３０ｇ／ｍ2となる
よう塗布し、１００℃で１分乾燥させて粘着剤層を形成
した。続いて、１μｍ厚さの酸化防止層、５０ｎｍ厚さ
の銀薄膜層、１２μｍ厚さのポリエステルフィルム層の
構成を有する銀蒸着フィルム（サイチ工業社製、Ａｇ１
２）の酸化防止層面と、上記粘着剤層面を重ねて、二本
のロール間に導き、加熱圧着して接着させ、面光源用反
射フィルムを得た。なお、二本のロール間で酸化防止層
面と粘着剤層面の接着を行うに際し、各ロールの表面温
度を５０℃、さらに接着時の圧力は線圧で１０００Ｎ／
ｃｍとした。得られた面光源用反射フィルムの全光線透
過率は１．３％であった。Example 1 A composition as shown below was put into a twin screw extruder, melted and extruded from a T-die at 290 ° C., then electrostatically brought into close contact with a cooling rotating roll and solidified. To obtain an unstretched sheet. Next, the unstretched sheet was placed in a roll stretching machine and stretched longitudinally 3.1 times at 80 ° C., and then transversely stretched 2.6 times at 125 ° C. with a tenter. And stretched 1.4 times. Thereafter, a 4% relaxation heat treatment at 235 ° C. was performed to obtain a 188 μm-thick polyester resin film (polyester resin layer) having many cavities therein. Polyethylene terephthalate resin (intrinsic viscosity: 0.62 dl / g) 74% by weight Polystyrene resin for general use (PS) [T575-57U, manufactured by Mitsui Toatsu Chemicals, Inc.] 25% by weight Maleimide-modified polystyrene resin (M-PS) [ NH1200 manufactured by Mitsui Toatsu Chemical Co., Ltd.] 1% by weight Next, on one surface of the polyester resin film,
Adhesive (X395-270S-
1: Seiden Chemical Co., Ltd.) was applied at 30 g / m 2 by WET and dried at 100 ° C. for 1 minute to form an adhesive layer. Subsequently, a silver vapor-deposited film having a configuration of an antioxidant layer having a thickness of 1 μm, a silver thin film layer having a thickness of 50 nm, and a polyester film layer having a thickness of 12 μm (manufactured by Saichi Industry Co., Ltd., Ag1)
The surface of the antioxidant layer of 2) and the surface of the pressure-sensitive adhesive layer were overlapped, guided between two rolls, and bonded by heating and pressing to obtain a reflective film for a surface light source. When bonding the antioxidant layer surface and the pressure-sensitive adhesive layer surface between the two rolls, the surface temperature of each roll was set to 50 ° C., and the pressure during bonding was set to a linear pressure of 1000 N /
cm. The total light transmittance of the obtained reflective film for a surface light source was 1.3%.
【００２９】実施例２ 実施例１と同様の組成物をＡ層構成材料とし、下記に示
す組成物をＢ層構成材料として、それぞれの組成物をを
２台の２軸スクリュー押し出し機に別々に投入し、Ｔ−
ダイス内で貼り合わせた後、Ｔ−ダイスより２９０℃で
溶融押し出した後、静電気的に冷却回転ロールに密着さ
せ、固定させることにより未延伸シートを得た。次に、
該未延伸シートをロール延伸機にかけ、８０℃で３．１
倍に縦延伸を行った後、テンターにて１２５℃で２．６
倍に横延伸すると共に、更にテンターにて２２０℃で
１．４倍延伸した。その後、２３５℃で４％の緩和熱処
理を施すことにより、２層のポリエステル系樹脂層（Ａ
層およびＢ層）の積層フィルムを得た。Ａ層は空洞含有
層であり、Ｂ層は白色隠ぺい層である。尚、厚みはＡ層
／Ｂ層＝１７３／１５μｍであった。得られた反射フィ
ルムの全光線透過率は２．０％であった。 Ａ層構成材料 実施例１のポリエステル系樹脂層の構成材料と同一 Ｂ層構成材料 ポリエチレンテレフタレート樹脂（固有粘度：０．６２ｄｌ／ｇ） ７５重量％ 二酸化チタン粒子 ［富士チタン（株）製、ＴＡ−３００］ ２５重量％ 比較例１ 実施例１と同様の方法で、内部に多数の空洞を有する厚
さ１８８μｍの単層のポリエステル系樹脂フィルムを
得、これを面光源用反射フィルムとした。得られた反射
フィルムの全光線透過率は１１．３％であった。Example 2 The same composition as in Example 1 was used as the material for forming the layer A, and the following composition was used as the material for forming the layer B. Each of the compositions was separately fed to two twin screw extruders. Throw in, T-
After laminating in a die, it was melt-extruded at 290 ° C. from a T-die, and then electrostatically adhered to a cooling rotating roll and fixed to obtain an unstretched sheet. next,
The unstretched sheet is set on a roll stretching machine at 80 ° C. and 3.1.
After performing longitudinal stretching twice, it was 2.6 times at 125 ° C. with a tenter.
The film was stretched laterally twice and further stretched 1.4 times at 220 ° C. by a tenter. Then, a relaxation heat treatment of 4% is performed at 235 ° C., whereby two polyester resin layers (A
And a layer B). Layer A is a void containing layer, and layer B is a white hiding layer. The thickness was A layer / B layer = 173/15 μm. The total light transmittance of the obtained reflection film was 2.0%. A layer constituent material Same as the constituent material of the polyester resin layer of Example 1. B layer constituent material 75% by weight of polyethylene terephthalate resin (intrinsic viscosity: 0.62 dl / g) titanium dioxide particles [manufactured by Fuji Titanium Co., Ltd., TA- 300] 25% by weight Comparative Example 1 In the same manner as in Example 1, a single-layered polyester resin film having a thickness of 188 μm and having many cavities inside was obtained, and this was used as a reflection film for a surface light source. The total light transmittance of the obtained reflective film was 11.3%.
【００３０】[0030]
【発明の効果】本発明の面光源用反射フィルムは、反射
性能等の多数の空洞を有するフィルムの優れた特性を保
持しつつ、隠蔽性にも優れる。The reflection film for a surface light source of the present invention has excellent concealing properties while maintaining the excellent properties of a film having many cavities, such as reflection performance.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｇ０２Ｆ 1/13357 Ｇ０２Ｆ 1/1335 ５３０ Ｆターム(参考） 2H042 BA01 BA15 BA20 DA04 DA11 DA21 DC02 DE00 2H091 FA16Z FA41Z FB02 LA17 LA18 4F100 AB24B AK12 AK41A AK41B AK42 AL05 AL07 AR00B BA02 CB00 DJ06A EH66B GB41 JB03B JN02B JN06 JN08 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) G02F 1/13357 G02F 1/1335 530 F-term (Reference) 2H042 BA01 BA15 BA20 DA04 DA11 DA21 DC02 DE00 2H091 FA16Z FA41Z FB02 LA17 LA18 4F100 AB24B AK12 AK41A AK41B AK42 AL05 AL07 AR00B BA02 CB00 DJ06A EH66B GB41 JB03B JN02B JN06 JN08
Claims (2)
エステル系樹脂層からなり、全光線透過率が２％以下で
あることを特徴とする面光源用反射フィルム。1. A reflection film for a surface light source, comprising a polyester resin layer mainly containing a large number of fine cavities and having a total light transmittance of 2% or less.
を有することを特徴とする請求項１記載の面光源用反射
フィルム。2. The reflection film for a surface light source according to claim 1, further comprising a concealing layer on a surface opposite to the surface on the incident light side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000256105A JP2002071913A (en) | 2000-08-25 | 2000-08-25 | Reflecting film for surface light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000256105A JP2002071913A (en) | 2000-08-25 | 2000-08-25 | Reflecting film for surface light source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002071913A true JP2002071913A (en) | 2002-03-12 |
Family
ID=18744770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000256105A Pending JP2002071913A (en) | 2000-08-25 | 2000-08-25 | Reflecting film for surface light source |
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| Country | Link |
|---|---|
| JP (1) | JP2002071913A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004053759A (en) * | 2002-07-17 | 2004-02-19 | Cosmo Tec:Kk | Reflection sheet for direct backlight of tft liquid crystal display device and direct backlight system tft liquid crystal display device using the same |
| JP2004184443A (en) * | 2002-11-29 | 2004-07-02 | Dainippon Ink & Chem Inc | Reflective/light shielding self-adhesive tape |
| WO2004060656A1 (en) * | 2003-01-06 | 2004-07-22 | Toray Industries, Inc. | Laminated film and method for producing same |
| WO2005114267A1 (en) * | 2004-05-20 | 2005-12-01 | Idemitsu Kosan Co., Ltd. | Light-shielding highly reflective polycarbonate multilayer sheet, and thermoformed body and case using same |
| JP2007261260A (en) * | 2006-03-02 | 2007-10-11 | Toray Ind Inc | White laminated polyester film for reflecting plate |
| JP2007328150A (en) * | 2006-06-08 | 2007-12-20 | Teijin Dupont Films Japan Ltd | White reflection film |
| JP2008257229A (en) * | 2007-03-14 | 2008-10-23 | Toray Ind Inc | Polyester film for reflection plate |
| JP2009051175A (en) * | 2007-08-29 | 2009-03-12 | Teijin Dupont Films Japan Ltd | Biaxially stretched laminated film for reflector |
| JP2017195352A (en) * | 2016-04-14 | 2017-10-26 | 大日本印刷株式会社 | Light emitting diode mounting module |
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| JPH0615774A (en) * | 1992-07-01 | 1994-01-25 | Mitsui Toatsu Chem Inc | Light reflecting sheet |
| JPH10206614A (en) * | 1997-01-23 | 1998-08-07 | Mitsui Chem Inc | Reflector and manufacture of reflector |
| JPH10316782A (en) * | 1998-05-12 | 1998-12-02 | Toyobo Co Ltd | Fine-void-containing polyester resin film or sheet |
Cited By (13)
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|---|---|---|---|---|
| JP2004053759A (en) * | 2002-07-17 | 2004-02-19 | Cosmo Tec:Kk | Reflection sheet for direct backlight of tft liquid crystal display device and direct backlight system tft liquid crystal display device using the same |
| JP2004184443A (en) * | 2002-11-29 | 2004-07-02 | Dainippon Ink & Chem Inc | Reflective/light shielding self-adhesive tape |
| WO2004060656A1 (en) * | 2003-01-06 | 2004-07-22 | Toray Industries, Inc. | Laminated film and method for producing same |
| JPWO2004060656A1 (en) * | 2003-01-06 | 2006-05-11 | 東レ株式会社 | Laminated film and method for producing the same |
| WO2005114267A1 (en) * | 2004-05-20 | 2005-12-01 | Idemitsu Kosan Co., Ltd. | Light-shielding highly reflective polycarbonate multilayer sheet, and thermoformed body and case using same |
| JP4548430B2 (en) * | 2006-03-02 | 2010-09-22 | 東レ株式会社 | White laminated polyester film for reflector |
| JP2007261260A (en) * | 2006-03-02 | 2007-10-11 | Toray Ind Inc | White laminated polyester film for reflecting plate |
| JP2007328150A (en) * | 2006-06-08 | 2007-12-20 | Teijin Dupont Films Japan Ltd | White reflection film |
| JP2008257229A (en) * | 2007-03-14 | 2008-10-23 | Toray Ind Inc | Polyester film for reflection plate |
| KR101453811B1 (en) | 2007-03-14 | 2014-10-22 | 도레이 카부시키가이샤 | Polyester film for reflecting plate |
| JP2009051175A (en) * | 2007-08-29 | 2009-03-12 | Teijin Dupont Films Japan Ltd | Biaxially stretched laminated film for reflector |
| JP2017195352A (en) * | 2016-04-14 | 2017-10-26 | 大日本印刷株式会社 | Light emitting diode mounting module |
| JP2017199737A (en) * | 2016-04-25 | 2017-11-02 | 大日本印刷株式会社 | Light emitting diode-mounted module, and light reflective member for light emitting diode-mounted module |
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