JPS63113059A - Shrink packaging film - Google Patents
Shrink packaging filmInfo
- Publication number
- JPS63113059A JPS63113059A JP26098286A JP26098286A JPS63113059A JP S63113059 A JPS63113059 A JP S63113059A JP 26098286 A JP26098286 A JP 26098286A JP 26098286 A JP26098286 A JP 26098286A JP S63113059 A JPS63113059 A JP S63113059A
- Authority
- JP
- Japan
- Prior art keywords
- film
- propylene
- copolymer
- olefin
- weight
- 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.)
- Granted
Links
- 229920006280 packaging film Polymers 0.000 title description 4
- 239000012785 packaging film Substances 0.000 title description 4
- 239000004711 α-olefin Substances 0.000 claims abstract description 43
- 229920001577 copolymer Polymers 0.000 claims abstract description 28
- 229920000089 Cyclic olefin copolymer Polymers 0.000 claims abstract description 27
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 claims abstract description 24
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims abstract description 21
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000005977 Ethylene Substances 0.000 claims abstract description 19
- 239000013032 Hydrocarbon resin Substances 0.000 claims abstract description 11
- 229920006270 hydrocarbon resin Polymers 0.000 claims abstract description 11
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000008096 xylene Substances 0.000 claims abstract description 6
- 239000011342 resin composition Substances 0.000 claims description 27
- 125000004432 carbon atom Chemical group C* 0.000 claims description 11
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 229920005606 polypropylene copolymer Polymers 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 229920005989 resin Polymers 0.000 abstract description 23
- 239000011347 resin Substances 0.000 abstract description 23
- 239000003208 petroleum Substances 0.000 abstract description 18
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 21
- 230000000903 blocking effect Effects 0.000 description 17
- 230000000704 physical effect Effects 0.000 description 16
- 238000002156 mixing Methods 0.000 description 13
- 229920005604 random copolymer Polymers 0.000 description 13
- -1 polyethylene Polymers 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 9
- 238000006116 polymerization reaction Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 229920000915 polyvinyl chloride Polymers 0.000 description 3
- 239000004800 polyvinyl chloride Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- YBYIRNPNPLQARY-UHFFFAOYSA-N 1H-indene Chemical compound C1=CC=C2CC=CC2=C1 YBYIRNPNPLQARY-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000011088 calibration curve Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- ZSWFCLXCOIISFI-UHFFFAOYSA-N cyclopentadiene Chemical compound C1C=CC=C1 ZSWFCLXCOIISFI-UHFFFAOYSA-N 0.000 description 2
- 229920001038 ethylene copolymer Polymers 0.000 description 2
- 238000012685 gas phase polymerization Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 150000003505 terpenes Chemical class 0.000 description 2
- 235000007586 terpenes Nutrition 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- IANQTJSKSUMEQM-UHFFFAOYSA-N 1-benzofuran Chemical compound C1=CC=C2OC=CC2=C1 IANQTJSKSUMEQM-UHFFFAOYSA-N 0.000 description 1
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 description 1
- 229920005674 ethylene-propylene random copolymer Polymers 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 229920005653 propylene-ethylene copolymer Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- MSFGZHUJTJBYFA-UHFFFAOYSA-M sodium dichloroisocyanurate Chemical compound [Na+].ClN1C(=O)[N-]C(=O)N(Cl)C1=O MSFGZHUJTJBYFA-UHFFFAOYSA-M 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- 150000003623 transition metal compounds Chemical class 0.000 description 1
Landscapes
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、低温収縮特性が優れ、しかも透明性、光沢お
よび耐ブロッキング性に優れた収縮包装用フィルムに関
する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a shrink packaging film that has excellent low-temperature shrinkage properties, as well as excellent transparency, gloss, and anti-blocking properties.
〈従来の技術〉
現在、収縮包装用フィルムの素材としては、ポリ塩化ビ
ニル、ポリエチレン、ポリプロピレン等が知られている
が、それぞれ長所、短所を有しており、全ての面で満足
すべきものは得られていない。<Prior art> Polyvinyl chloride, polyethylene, polypropylene, etc. are currently known as materials for shrink wrapping films, but each has advantages and disadvantages, and it is difficult to find one that satisfies all aspects. It has not been done.
ポリ塩化ビニルは透明性が優れ、かつ低温収縮性が極め
て優れているが、低温耐性や溶断シール部耐性が悪く、
又可塑剤の食品衛生上の問題や廃棄上の問題が有る。Polyvinyl chloride has excellent transparency and low-temperature shrinkability, but it has poor low-temperature resistance and resistance to fused seals.
There are also food hygiene and disposal problems associated with plasticizers.
ポリエチレンとしては、線状低密度ポリエチレンを素材
として２軸延伸処理されたフィルムが出されているが、
透明性が悪く、低温収縮性が満足できる水準には到って
いないものである。As for polyethylene, films made from linear low-density polyethylene and subjected to biaxial stretching are available.
It has poor transparency and low-temperature shrinkability that does not reach a satisfactory level.
一方、ポリプロピレンを素材としたものとしては、エチ
レンを３〜５ｗｔχ程度共重合したプロピレン−エチレ
ンランダム共重合体やエチレンヲ１〜３ｗｔχ、ブテン
−１を３〜１０ｗｔχ程度共重合したプロピレン−エチ
レン−ブテン−１三元ランダム共重合体（特開昭５２−
１６５８８号公報）を２軸延伸処理されたフィルムが知
られているが、低温収縮性が満足できないものである。On the other hand, examples of materials made from polypropylene include propylene-ethylene random copolymers in which ethylene is copolymerized to the extent of 3 to 5 wtχ, and propylene-ethylene-butene-ethylene copolymers in which ethylene is copolymerized to the extent of 3 to 3 wtχ and butene-1 is copolymerized to the extent of 3 to 10 wtχ. 1 ternary random copolymer (Japanese Patent Application Laid-open No. 1983-
A biaxially stretched film is known, but its low-temperature shrinkability is unsatisfactory.
この低温収縮性を改良する為にエチレン含有量をさらに
増加させたプロピレン−エチレンランダム共重合体を使
用したのでは、延伸処理されたフィルムの透明性が失わ
れたり、経時的にブリード白化したり、耐ブロッキング
性が悪かったりして好ましくない。特開昭４９−９９６
４５号公報には、プロピレン−エチレンランダム共重合
体に石油樹脂をブレンドした樹脂組成物を延伸処理した
フィルムは、低温収縮性が優れていることが示されてい
る。しかしそこで開示されているのはエチレンが５％含
有されたプロピレン−エチレン共重合体に石油樹脂が２
０ｗ ｔχ混合されているものであり、本発明者の知見
によればフィルムの耐ブロッキング性能が極めて悪いも
のである。このブロッキング性能を改良しようとして、
石油樹脂のブレンド割合を減少させた場合、上記２０ｗ
ｔχ混合品と同様の低温収縮性を発現させる為には、
エチレン含有量が５ｗｔχよりかなり増加させたプロピ
レン−エチレンランダム共重合体を使用しなければなら
ないようになる。ところが上記したように、このエチレ
ンが５ｗｔχよりかなり多量に含有するプロピレン−エ
チレンランダム共重合体は延伸処理すると透明性が失わ
れたり、経時的にブリード白化したり、耐ブロッキング
性が悪かったりするのであり、石油樹脂のブレンド割合
が少な（でも同じような問題がある。If a propylene-ethylene random copolymer with a further increased ethylene content was used to improve this low-temperature shrinkability, the stretched film would lose its transparency and bleed and whiten over time. , undesirable because of poor blocking resistance. Japanese Patent Publication No. 49-996
No. 45 discloses that a film obtained by stretching a resin composition in which a propylene-ethylene random copolymer is blended with a petroleum resin has excellent low-temperature shrinkability. However, what is disclosed therein is a propylene-ethylene copolymer containing 5% ethylene and 2% petroleum resin.
According to the findings of the present inventor, the anti-blocking performance of the film is extremely poor. In an attempt to improve this blocking performance,
When the blending ratio of petroleum resin is reduced, the above 20w
In order to exhibit the same low-temperature shrinkage as the tχ mixture,
It becomes necessary to use a propylene-ethylene random copolymer with an ethylene content significantly increased from 5wtχ. However, as mentioned above, propylene-ethylene random copolymers containing considerably more ethylene than 5wtχ lose transparency when stretched, bleed white over time, and have poor blocking resistance. Yes, but the blending ratio of petroleum resin is small (but there are similar problems).
次に同じプロピレン系共重合体の中でも、特開昭５３−
１１３６９２号公報や特開昭６０−１２７１３３号公報
には、各々特定のプロピレン−α−オレフィン共重合体
を延伸処理してなるフィルム、特公昭５７−２４３７５
号公報には、プロピレン−ブテン−１ランダム−共重合
体とアイソタクチックポリプロピレンとの組成物を延伸
処理してなるフィルムが示されている。しかしこれらも
、満足のいく低温収縮性を達成させようとすればフィル
ムが極度に軟質化してしまい収縮包装後の結束力が不足
したり、又あるものは耐ブロッキング性が悪いといった
問題がある。Next, among the same propylene copolymers, JP-A-53-
No. 113692 and JP-A-60-127133 each disclose a film obtained by stretching a specific propylene-α-olefin copolymer, and JP-A No. 57-24375.
The publication discloses a film obtained by stretching a composition of a propylene-butene-1 random copolymer and isotactic polypropylene. However, these also have the problem that if they try to achieve satisfactory low-temperature shrinkability, the film becomes extremely soft, resulting in insufficient cohesive strength after shrink wrapping, and some have poor blocking resistance.
〈発明が解決しようとする問題点〉
本発明者らは、以上のような状況に鑑み、低温収縮性が
格段に優れ、透明性、光沢、耐ブロッキング性に優れ、
しかも過度に軟質でない収縮包装用フィルムを開発しよ
うとして鋭意検討した。<Problems to be Solved by the Invention> In view of the above-mentioned circumstances, the present inventors have developed a material that has significantly superior low-temperature shrinkability, excellent transparency, gloss, and anti-blocking properties.
In addition, we conducted extensive research in an effort to develop a shrink packaging film that was not excessively soft.
く問題点を解決するための手段〉
その結果、特定のプロピレン−α−オレフィン共重合体
を特定量以上含有するプロピレン共重合体に炭化水素樹
脂を限定量配合した樹脂組成物を成膜後少なくとも一軸
方向に延伸処理を行うことにより上記諸特性を全て合わ
せ持つ収縮包装用フィルムが得られることを見い出すに
至り、本発明を完成した。As a result, after forming a film, at least The present invention was completed based on the discovery that a shrink wrapping film having all of the above properties can be obtained by uniaxially stretching the film.
即ち本発明は、
プロピレンと炭素数４以上のα−オレフィン又はプロピ
レンと炭素数４以上のα−オレフィンとエチレンとの共
重合体であって、
■共重合体の炭素数４以上のα−オレフィン含有量が８
〜３５モル％
■共重合体のエチレン含有量が５モル％以下■共重合体
の冷キシレン可溶部が１５〜７０ｗ ｔχであるプロピ
レン−α−オレフィン共重合体を３０重量％以上含有す
るプロピレン共重合体に炭化水素樹脂が２〜１０重量部
配置部れた樹脂組成物を、成膜後少なくとも一軸方向に
延伸処理を施してなることを特徴とする収縮包装用フィ
ルムである。That is, the present invention provides a copolymer of propylene and an α-olefin having 4 or more carbon atoms, or a copolymer of propylene, an α-olefin having 4 or more carbon atoms, and ethylene, comprising: (1) an α-olefin having 4 or more carbon atoms in the copolymer; Content is 8
~35 mol% ■ Propylene containing 30% by weight or more of a propylene-α-olefin copolymer in which the ethylene content of the copolymer is 5 mol% or less ■ The cold xylene soluble portion of the copolymer is 15 to 70 wtχ This is a film for shrink packaging, characterized in that it is formed by stretching a resin composition in which 2 to 10 parts by weight of a hydrocarbon resin is disposed in a copolymer in at least one axis after film formation.
本発明で得られるフィルムの第１の特徴は、低温収縮性
が格段に優れている上に、透明性、光沢、耐ブロッキン
グ性に優れている点である。第２の特徴は、過度に軟質
でないため収縮包装後の結束力が優れている点である。The first feature of the film obtained according to the present invention is that it has excellent low-temperature shrinkability, as well as excellent transparency, gloss, and blocking resistance. The second feature is that it is not excessively soft and has excellent binding strength after shrink wrapping.
第３の特徴はプロピレン系共重合体の単独系から得られ
るフィルムに比較して、収縮包装時にコーナ一部の皺の
発生が少なく仕上がりがきれいな点である。The third feature is that compared to a film obtained from a single propylene copolymer, wrinkles at some corners are less likely to occur during shrink wrapping and the finish is more beautiful.
以下本発明の詳細な説明する。The present invention will be explained in detail below.
本発明で使用するプロピレン−α−オレフィン共重合体
は、触媒系として、公知のα−オレフィンの立体規則性
重合用触媒である、いわゆるチーグラー・ナツタ触媒、
即ち周期律表第■〜■族遷移金属化合物と周期律表第１
〜■族典型金属の有機化合物と電子供与性化合物等の第
３成分とからなるものを使用し、重合法としては、溶剤
中で重合する溶剤重合法あるいは気相中で重合する気相
重合法等いずれの方法によっても製造することができる
０例えば特願昭６１−１６４５０５号公報に記載された
共重合体（Ｂ）を重合する方法で得ることができるが、
以下に規定する条件を満足するプロピレン−α−オレフ
ィン共重合体ならばそれでよい。The propylene-α-olefin copolymer used in the present invention uses a so-called Ziegler-Natsuta catalyst, which is a known catalyst for stereoregular polymerization of α-olefins, as a catalyst system.
That is, transition metal compounds of Groups ■ to ■ of the periodic table and Groups 1 of the periodic table.
A compound consisting of an organic compound of a typical group metal and a third component such as an electron-donating compound is used, and the polymerization method is a solvent polymerization method in which polymerization is performed in a solvent or a gas phase polymerization method in which polymerization is performed in a gas phase. For example, it can be obtained by the method of polymerizing the copolymer (B) described in Japanese Patent Application No. 164505/1982.
Any propylene-α-olefin copolymer that satisfies the conditions specified below may be used.
本発明で使用するプロピレン−α−オレフィン共重合体
は、コモノマーとして炭素数４以上のα−オレフィンあ
るいはエチレンを少量併用して使用する。炭素数４以上
のα−オレフィンとしては、ブテン−１、ペンテン−１
、ヘキセン−１，４−メチル−ペンテン−１等の単独あ
るいは、併用系があげられる。例えば、気相重合を実施
した場合、液化しにくいことから分圧を高（とれるブテ
ン−１が好ましい。The propylene-α-olefin copolymer used in the present invention uses a small amount of α-olefin having 4 or more carbon atoms or ethylene as a comonomer. As α-olefins having 4 or more carbon atoms, butene-1, pentene-1
, hexene-1,4-methyl-pentene-1, etc. alone or in combination. For example, when gas phase polymerization is carried out, butene-1 is preferred because it is difficult to liquefy and can maintain a high partial pressure.
本発明で使用するプロピレン−α−オレフィン共重合体
の炭素数４以上のα−オレフィン含有量は、８〜３５モ
ル％であり、１０〜３０モル％が好ましい。炭素数４以
上のα−オレフィン含有量が該下限界を下廻ると、本プ
ロピレン−α−オレフィン共重合体を配合して得られる
樹脂組成物は低温での延伸が不可能になったり、ひいて
は低温収縮性が悪くなったり、延伸後のフィルムの透明
性が悪くなったりして好ましくない。炭素数４以上のα
−オレフィン含有量が該上限界を上廻ると、延伸後のフ
ィルムの耐ブロッキング性が悪くなったり、フィルムが
過度に軟質化して好ましくない。The content of α-olefin having 4 or more carbon atoms in the propylene-α-olefin copolymer used in the present invention is 8 to 35 mol%, preferably 10 to 30 mol%. If the content of α-olefin having 4 or more carbon atoms falls below the lower limit, the resin composition obtained by blending the present propylene-α-olefin copolymer may become impossible to stretch at low temperatures, or even This is undesirable because low-temperature shrinkability deteriorates and the transparency of the film after stretching deteriorates. α with carbon number 4 or more
- If the olefin content exceeds the upper limit, the blocking resistance of the stretched film may deteriorate or the film may become excessively soft, which is not preferable.
本発明で使用するプロピレン−α−オレフィン共重合体
のエチレン含有量は５モル％以下であり、３モル％以下
が好ましい。エチレン含有量が該上限界を上廻ると、フ
ィルムの透明性が経時的に、悪化したり耐ブロッキング
性が悪くなり好ましくない。The ethylene content of the propylene-α-olefin copolymer used in the present invention is 5 mol% or less, preferably 3 mol% or less. When the ethylene content exceeds the upper limit, the transparency of the film deteriorates over time and the blocking resistance deteriorates, which is not preferable.
本発明で使用するプロピレン−α−オレフィン共重合体
の冷キシレン可溶部（ＣＸＳ）は１５〜７０ｗｔＸ１？
アリ、１６〜５０ｗｔＸ カ好ましい。ｃｘｓが８亥下
限界を下廻ると本プロピレン−α−オレフィン共重合体
を配合し・て得られる樹脂組成物は低温での延伸が不可
能になったり、ひいては低温収縮性や、延伸後のフィル
ムの透明性が悪くなったりして好ましくない。 ＣＸＳ
が該上限界を上廻ると、延伸後のフィルムの耐ブロッキ
ング性が悪くなったり、フィルムが過度に軟質化して好
ましくない。The cold xylene soluble part (CXS) of the propylene-α-olefin copolymer used in the present invention is 15 to 70wtX1?
Ali, 16-50wtX is preferable. If cxs is below the lower limit of 8, the resin composition obtained by blending the present propylene-α-olefin copolymer may become impossible to stretch at low temperatures, and may have poor low-temperature shrinkage or poor stretching properties. This is not preferable because the transparency of the film deteriorates. CXS
If it exceeds the upper limit, the blocking resistance of the stretched film may deteriorate or the film may become excessively soft, which is not preferable.
本発明で使用するプロピレン共重合体は、上記のプロピ
レン−α−オレフィン共重合体と下記のプロピレン−ラ
ンダム共重合体とのブレンドにより得ることができる。The propylene copolymer used in the present invention can be obtained by blending the propylene-α-olefin copolymer described above and the propylene-random copolymer described below.
ここでいうプロピレンランダム共重合体とは、周知のも
ので結晶性のエチレン−プロピレンランダム共重合体、
あるいはエチレン−ブテン−１−プロピレンランダムタ
ーポリマーなどであり、コモノマー含有量が１〜１５ｗ
ｔｚのものである。又ＣＸＳは１５−ｔ％以下のもので
ある。該プロピレン−α−オレフィン共重合体のブレン
ド割合は、３０重量％以上であり、４０重量％以上が好
ましり５０重量％以上がより好ましい。該プロピレン−
α−オレフィン共重合体のブレンド割合が該下限界を下
廻ると、炭化水素樹脂あ配合割合を多くしないと延伸後
のフィルムの透明性が悪（なる。たとえ炭化水素樹脂の
配合割合を多くして延伸後のフィルムの透明性をよくし
たとしても、フィルムの耐ブロッキング性が悪（なり好
ましくない。The propylene random copolymer mentioned here is a well-known crystalline ethylene-propylene random copolymer,
Alternatively, it is an ethylene-butene-1-propylene random terpolymer, etc., with a comonomer content of 1 to 15w.
It is from tz. Moreover, CXS is 15-t% or less. The blending ratio of the propylene-α-olefin copolymer is 30% by weight or more, preferably 40% by weight or more, and more preferably 50% by weight or more. The propylene
If the blending ratio of the α-olefin copolymer falls below the lower limit, the transparency of the stretched film will deteriorate unless the blending ratio of the hydrocarbon resin is increased. Even if the blending ratio of the hydrocarbon resin is increased, Even if the transparency of the film after stretching is improved, the blocking resistance of the film is undesirable.
本発明で使用する炭化水素樹脂とは、石油樹脂、テルペ
ン樹脂、シクロペンタジェン樹脂、クマロンインデン樹
脂などである。これらの樹脂の中で極性基を有しないも
のや水素を付加して９５％以上の水添率にしたものが好
ましい。The hydrocarbon resins used in the present invention include petroleum resins, terpene resins, cyclopentadiene resins, coumaron indene resins, and the like. Among these resins, those having no polar group or those having hydrogen added thereto to have a hydrogenation rate of 95% or more are preferred.
本発明で使用する炭化水素樹脂の軟化点（環球法）は１
１０℃以上のものが好ましい。軟化点が１１０℃未満の
ものを使用したのでは、得られたフィルムの耐ブロッキ
ング性が悪くなり好ましくない。The softening point (ring and ball method) of the hydrocarbon resin used in the present invention is 1
Preferably, the temperature is 10°C or higher. If a material with a softening point of less than 110° C. is used, the resulting film will have poor blocking resistance, which is not preferred.
本発明のフィルム成膜に供する樹脂組成物は上記プロピ
レン共重合体に上記炭化水素樹脂を２〜１０重量部配置
部て得られる。炭化水素樹脂の配合割合が該下限界を下
廻ると、本発明の目的に沿うだけの低温収縮性を達成す
るにはフィルムが過度に軟質化したり、耐ブロッキング
性が悪くなり好ましくない。炭化水素樹脂の配合割合が
該上限界を上廻ると、フィルムの耐ブロッキング性が悪
くなり好ましくない。The resin composition used for film formation of the present invention is obtained by adding 2 to 10 parts by weight of the above hydrocarbon resin to the above propylene copolymer. If the blending ratio of the hydrocarbon resin is below the lower limit, the film may become too soft or the blocking resistance may deteriorate in order to achieve low-temperature shrinkability sufficient to meet the purpose of the present invention, which is not preferable. If the blending ratio of the hydrocarbon resin exceeds the upper limit, the blocking resistance of the film will deteriorate, which is not preferable.
本発明のフィルム成膜に供する樹脂組成物のメルトイン
デックス（ｇ／１０分）は０．５〜５０ｇ／ １０分で
あるものが好ましい。メルトインデックスが該下限界を
下廻ると加工性が悪くなり好ましくな（、該上限界を上
廻るとフィルムの延伸性が悪くなり好ましくない。The melt index (g/10 minutes) of the resin composition used for film formation of the present invention is preferably 0.5 to 50 g/10 minutes. If the melt index is below the lower limit, the processability will deteriorate, which is not preferable; if it exceeds the upper limit, the film's stretchability will deteriorate, which is not preferable.
本発明において、上記樹脂組成物を得る方法としては、
公知の任意の方法で均一分散させて得ることができる０
例えば、押出溶融ブレンド法、バンバリーブレンド法な
どである。In the present invention, the method for obtaining the resin composition includes:
0, which can be obtained by uniformly dispersing it by any known method.
Examples include extrusion melt blending method and Banbury blending method.
本発明において、上記樹脂組成物には、帯電防止剤、耐
ブロッキング剤、滑剤、防曇剤、安定性、および造核剤
などの添加剤を添加することができる。In the present invention, additives such as antistatic agents, antiblocking agents, lubricants, antifogging agents, stability agents, and nucleating agents can be added to the resin composition.
本発明において、フィルム成形する方法としてはＴダイ
キャスト法、水冷インフレ法などの公知の加工法を採用
することができる。又延伸処理を施す方法としては、ロ
ール延伸やロール圧延、テンター横１軸延伸などの公知
の１軸延伸方法、ならびにテンター２軸延伸やチューブ
ラ−２軸延伸などの公知の２軸延伸方法が採用できる。In the present invention, known processing methods such as the T-die casting method and the water-cooled inflation method can be employed as a method for forming the film. In addition, as a method for performing the stretching treatment, known uniaxial stretching methods such as roll stretching, roll rolling, and tenter horizontal uniaxial stretching, as well as known biaxial stretching methods such as tenter biaxial stretching and tubular biaxial stretching, are employed. can.
延伸温度は常温から共重合体の融点以下であるが、得ら
れたフィルムの低温収縮性をよくするには均一な延伸が
行なえる範囲でできるだけ低温であるのが好ましい。
延伸倍率としては２〜１０倍が好ましい。この場合、Ｍ
Ｄ （縦方向）およびＴＤ（横方向）の延伸倍率につい
ては必ずしもバランスさせる必要はなく、各々の用途に
応じて任意に選択することができる。 又ヒートセット
を行ってもよい。なお、実施例及び比較例におけるデー
ター及び評価は、次の方法に従って行ったものである。The stretching temperature ranges from room temperature to below the melting point of the copolymer, but in order to improve the low-temperature shrinkability of the obtained film, it is preferably as low as possible within a range that allows uniform stretching.
The stretching ratio is preferably 2 to 10 times. In this case, M
The stretching ratios of D (longitudinal direction) and TD (horizontal direction) do not necessarily need to be balanced, and can be arbitrarily selected depending on each application. Heat setting may also be performed. In addition, the data and evaluation in Examples and Comparative Examples were performed according to the following method.
（１）共重合体中のα−オレフィン含量重合時の物質収
支から求めた。又ブテン−１の含量については更に赤外
分光光度計を用いて、７７０ｃｍ −１特性吸収から常
法により定量した。なお、赤外分光光度計による測定は
、プロピレン−ブテン−１コポリマーについて、”Ｃ−
ＮＭＲによる定量値により検量線を作成し定量した。(1) α-olefin content in copolymer It was determined from the mass balance during polymerization. Furthermore, the content of butene-1 was further determined using an infrared spectrophotometer using a conventional method based on characteristic absorption at 770 cm −1 . In addition, measurements using an infrared spectrophotometer are performed on propylene-butene-1 copolymer with "C-
A calibration curve was created and quantified based on quantitative values determined by NMR.
（２）共重合体中のエチレン含量
赤外分光光度計を用いて７３２ｃｍ ”、７２０ ｃｍ
−’の特性吸収から常法により定量した。なお赤外分光
光度計による測定はＩ４Ｃでラベルしたエチレンコポリ
マーの放射線測定による定量値により検量線を作成し定
量した。(2) Ethylene content in the copolymer measured using an infrared spectrophotometer at 732 cm” and 720 cm.
−' was determined by a conventional method from the characteristic absorption. In addition, in the measurement using an infrared spectrophotometer, a calibration curve was prepared using quantitative values determined by radiation measurement of an ethylene copolymer labeled with I4C, and the amount was determined.
（３）冷キシレン可溶部（ＣＸ Ｓ）
ポリマー５ｇをキシレン５００ｍ ｌに溶解し、次いで
室温まで徐冷する。ついで２０℃のバス中に４時間放置
した後に濾過し、濾液濃縮、乾固、乾燥して秤量する。(3) Cold xylene soluble portion (CX S) 5 g of polymer is dissolved in 500 ml of xylene, and then slowly cooled to room temperature. Then, the mixture was left in a bath at 20° C. for 4 hours, filtered, and the filtrate was concentrated, dried, and weighed.
（４）メルトインデックス（Ｍｌ）
Ａ Ｓ Ｔ Ｍ −Ｄ １２３８にｔ＄拠（５）ヘイズ
値（Ｈａｚｅ）
ＡＳＴＭ−Ｄ１００３に準拠
（６）フィルムのヤング率
ＡＳＴＭ−Ｄ８８２に準拠
但し、試験片形状：２０Ｘ１２０の短冊型チャック開路
Ｍ： ５０ｍｍ
引張速度：５ｍｍ／分
（７）加熱収縮率
５ｃｍ角のフィルム試片を所定温度のグリセリン浴に１
０秒間浸漬した時のＭＤ、ＴＤの収縮率を測定する。(4) Melt index (Ml) Based on ASTM-D 1238 and t$ (5) Haze value (Haze) Based on ASTM-D1003 (6) Young's modulus of film Based on ASTM-D882 However, test piece shape: 20 x 120 strip chuck opening M: 50 mm Pulling speed: 5 mm/min (7) Heat shrinkage rate A 5 cm square film specimen is placed in a glycerin bath at a predetermined temperature.
Measure the shrinkage rate of MD and TD when immersed for 0 seconds.
（８）ブロッキング
５ ｃｍ Ｘ １０ｃｍ角の２枚のフィルムを互いに５
ｃｍずらして重ね、重なった５ｃｍ角の部分に１０ｋｇ
の荷重をかけたまま、４０℃で２４ｈｒ状態調節する。(8) Blocking 2 pieces of film 5 cm x 10 cm square
Shift them by cm and stack them, and add 10 kg to the overlapped 5 cm square part.
Conditioning was carried out at 40°C for 24 hours with the load applied.
荷重を除いた後２３℃の温度に十分調整した後、２００
ｍｍ／分の引張速度でせん断剥離強度（ｇ）を求め、そ
の値をもって表わす。After removing the load and fully adjusting the temperature to 23℃,
The shear peel strength (g) is determined at a tensile rate of mm/min and is expressed as the value.
以下、本発明を実施例により、さらに詳しく説明するが
、本発明はその要旨を超えない限り′実施例に限定され
るものではない。Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to the Examples unless it exceeds the gist thereof.
〈実施例〉
実施例１
プロピレン−α−オレフィン共重合体くブテン−１含有
量２０．１モル％、ＣＸ Ｓ ２３．０賀ｔχ、メルト
インデックス３．０ｇ／１０分）単独からなるプロピレ
ン共重合体１００重量部に対して水添石油樹脂（荒用化
学製アルコンＰ−１２５、軟化点（環球法）１２５℃）
を５重量部添加し、さらに安定剤としてＢＨ７０，１部
、アンチブロッキング剤として微粉状アルミノシリケー
ト０．４部、滑剤としてエルカ酸アミド０．２部添加し
たものを、６５Φ抽出機により溶融ブレンドして樹脂組
成物を得た。この樹脂組成物について、プレス法にて４
００μのシートを得、それから９０角のシートを採取し
て以下の条件で２軸延伸フイルムを得た。<Example> Example 1 Propylene copolymer consisting of propylene-α-olefin copolymer (butene-1 content 20.1 mol%, CXS 23.0g/tχ, melt index 3.0g/10 min) Hydrogenated petroleum resin (Arayo Kagaku Alcon P-125, softening point (ring and ball method) 125°C) per 100 parts by weight of the combined
5 parts by weight of was added, and 1 part of BH70 as a stabilizer, 0.4 part of finely powdered aluminosilicate as an anti-blocking agent, and 0.2 part of erucic acid amide as a lubricant were melt-blended using a 65Φ extractor. A resin composition was obtained. About this resin composition, 4
A 00 μm sheet was obtained, and a 90 square sheet was taken from it to obtain a biaxially stretched film under the following conditions.
延伸機：東洋精機製卓上２軸延伸機
温度＝７０℃
予熱時間：３分
延伸倍率：Ｍｎ２倍、ＴＤ５＝倍
延伸速度： １５ｍ／分
上記で得た約１５μ厚さのフィルムの物性を第１表に示
した。尚、フィルム物性についてはＭＤ、ＴＤの平均値
で示した。Stretching machine: Tabletop biaxial stretching machine manufactured by Toyo Seiki Temperature = 70°C Preheating time: 3 minutes Stretching ratio: Mn 2 times, TD5 = times Stretching speed: 15 m/min The physical properties of the approximately 15μ thick film obtained above were Shown in the table. The physical properties of the film are shown as average values of MD and TD.
この２軸延伸フイルムは、低温収縮性が格段に優れてお
り、透明性も良く、プロ・ノキング特性も許容範囲内で
あり、又過度に軟質なフィルムでもなく、収縮包装用フ
ィルムとして優れたものであった。This biaxially stretched film has excellent low-temperature shrinkability, good transparency, and pro-knocking properties within the allowable range, and is not an excessively soft film, making it an excellent film for shrink packaging. Met.
実施例２
プロピレン−α−オレフィン共重合体（ブテン−１含有
量１２．５モル％、 エチレン含有量２．５モル％、Ｃ
Ｘ５２６．５賀ｔχ、メルトインデックス３．８ｇ７１
０分）単独からなるプロピレン共重合体１００重量部に
対して水添石油樹脂（アルコンＰ−１２５）を４重量部
添加し、その他は実施例１と同様にして樹脂組成物を得
た。この樹脂組成物について実施例１と同様の条件で２
軸延伸フイルムを得た。Example 2 Propylene-α-olefin copolymer (butene-1 content 12.5 mol%, ethylene content 2.5 mol%, C
X526.5gatχ, melt index 3.8g71
A resin composition was obtained in the same manner as in Example 1 except that 4 parts by weight of a hydrogenated petroleum resin (Alcon P-125) was added to 100 parts by weight of a propylene copolymer consisting of a single propylene copolymer. This resin composition was treated under the same conditions as Example 1.
An axially stretched film was obtained.
フィルム物性を第１表に示したが、この２軸延伸フイル
ムは、実施例１のフィルムと同様、収縮包装用フィルム
として優れたものであった。The physical properties of the film are shown in Table 1. Like the film of Example 1, this biaxially stretched film was excellent as a film for shrink wrapping.
実施例３
プロピレン−α−オレフィン共重合体（ブテン−１含有
量１５．６モル％、ＣＸ Ｓ １９．１賀ｔχ、メルト
インデックス３．５ｇ／１０分）単独からなるプロピレ
ン共重合体１００重量部に対して、水添石油樹脂（アル
コンＰ−１２５）を６重量部添加し、その他は、実施例
１と同様にして、樹脂組成物を得た。この樹脂組成物に
ついては実施例１と同様の条件で２軸延伸フイルムを得
た。フィルム物性を第１表に示したが、この２軸延伸フ
イルムは実施例１のフィルムと同様、収縮包装用フィル
ムとして優れたものであった。Example 3 100 parts by weight of propylene copolymer consisting solely of propylene-α-olefin copolymer (butene-1 content 15.6 mol%, CX S 19.1g/tχ, melt index 3.5 g/10 min) A resin composition was obtained in the same manner as in Example 1, except that 6 parts by weight of hydrogenated petroleum resin (Alcon P-125) was added thereto. A biaxially stretched film was obtained from this resin composition under the same conditions as in Example 1. The physical properties of the film are shown in Table 1. Like the film of Example 1, this biaxially stretched film was excellent as a film for shrink wrapping.
実施例４
プロピレン−α−オレフィン共重合体として、実施例１
と同一のもの７０重量％とプロピレン−ランダム共重合
体（住友化学工業曲製ノーブレン＠ＲＷ１６０、エチレ
ン含有量５．ＯｗｔＸ、 ＣＸ Ｓ４．３賀ｔχ、メル
トインデックス８．２ｇ／１０分）３０重量％とからな
るプロピレン共重合体１００重量部に対して、水添石油
樹脂（アルコンＰ−１２５）を５重量部添加し、その他
は実施例１と同様にして樹脂組成物を得た。この樹脂組
成物について実施例１と同様の条件で２軸延伸フイルム
を得た。フィルム物性を第１表に示したが、この２軸延
伸フイルムは、実施例１のフィルムと同様、収縮包装用
フィルムとして優れたものであった。Example 4 As a propylene-α-olefin copolymer, Example 1
70% by weight of the same material and 30% by weight of propylene-random copolymer (Sumitomo Chemical Co., Ltd. Noblen@RW160, ethylene content 5.OwtX, CX S4.3g/10min, melt index 8.2g/10min) A resin composition was obtained in the same manner as in Example 1 except that 5 parts by weight of a hydrogenated petroleum resin (Alcon P-125) was added to 100 parts by weight of a propylene copolymer consisting of: A biaxially stretched film was obtained from this resin composition under the same conditions as in Example 1. The physical properties of the film are shown in Table 1. Like the film of Example 1, this biaxially stretched film was excellent as a film for shrink wrapping.
実施例５
プロピレン−α−オレフィン共重合体（ブテン−１含有
量２５．１モル％、ＣＸ Ｓ３５．１賀ｔχ、メルトイ
ンデックス２．８ｇ／１０分） ４０重量％と、プロピ
レン−ランダム共重合体（住友化学工業■製ノーブレン
’Ｉ ＲＷ１６０）６０重量％とからなるプロピレン共
重合体１００重量部に対して、水添石油樹脂（アルコン
Ｐ＝１２５）を８重量部添加し、その他は実施例１と同
様にして樹脂組成物を得た。この樹脂組成物について、
実施例１と同様の条件で２軸延伸フィルムを得た。フィ
ルム物性を第１表に示したが、この２軸延伸フイルムは
、実施例１のフィルムと同様、収縮包装用フィルムとし
て優れたものであった。Example 5 40% by weight of propylene-α-olefin copolymer (butene-1 content 25.1 mol%, CX S35.1g/tχ, melt index 2.8 g/10 min) and propylene-random copolymer 8 parts by weight of hydrogenated petroleum resin (Alcon P=125) were added to 100 parts by weight of a propylene copolymer consisting of 60% by weight (Noblen'I RW160 manufactured by Sumitomo Chemical ■), and the rest was as in Example 1. A resin composition was obtained in the same manner as above. Regarding this resin composition,
A biaxially stretched film was obtained under the same conditions as in Example 1. The physical properties of the film are shown in Table 1. Like the film of Example 1, this biaxially stretched film was excellent as a film for shrink wrapping.
実施例６
プロピレン−α−オレフィン共重合体として、実施例２
と同一のもの８０重量％と、プロピレン−ランダム共重
合体（住友化学工業特製ノーブレン＠ＷＦ８９３Ｒ用の
ベースパウダー、エチレン含有量２．０ｉｎＬχ、ブテ
ン−１含有量５．１賀ｔχ、ＣＸ５３．８賀ｔχ、メル
トインデックス５．８ｇ／１０分）２０重量％とからな
るプロピレン共重合体１００重量部に対して、水添石油
樹脂（アルコンＰ−１２５）を５重量部添加し、その他
は、実施例１と同様の条件で２軸延伸フイルムを得た。Example 6 As a propylene-α-olefin copolymer, Example 2
and propylene-random copolymer (Base powder for Sumitomo Chemical Special Noblen@WF893R, ethylene content 2.0 inLχ, butene-1 content 5.1kgtχ, CX53.8kg) 5 parts by weight of a hydrogenated petroleum resin (Alcon P-125) was added to 100 parts by weight of a propylene copolymer consisting of 20% by weight (tχ, melt index 5.8 g/10 min), and the rest was as described in Example A biaxially stretched film was obtained under the same conditions as in Example 1.
フィルム物性を第１表に示したが、この２軸延伸フイル
ムは、実施例１のフィルムと同様、収縮包装用フィルム
として優れたものであった。The physical properties of the film are shown in Table 1. Like the film of Example 1, this biaxially stretched film was excellent as a film for shrink wrapping.
実施例７
実施例１において、水添石油樹脂のかわりに水添テルペ
ン樹脂（安原油脂製、クリアロンＰ−１２５軟化点（環
球法）１２５℃）を使用する以外は、全て同様の条件で
２軸延伸フイルムを得た。フィルム物性を第１表に示し
たが、この２軸延伸フイルムは実施例１のフィルムと同
様、収縮包装用フィルムとして優れたものであった。Example 7 In Example 1, a biaxial test was carried out under the same conditions except that hydrogenated terpene resin (manufactured by Cheap Oil Co., Ltd., Clearon P-125 softening point (ring and ball method) 125°C) was used instead of hydrogenated petroleum resin. A stretched film was obtained. The physical properties of the film are shown in Table 1. Like the film of Example 1, this biaxially stretched film was excellent as a film for shrink wrapping.
比較例１
実施例１において使用したプロピレン−α−オレフィン
共重合体だけを使用して、実施例１と同様の条件で２軸
延伸フイルムを得た。但し、２軸延伸時、延伸温度が７
０℃では、均一な延伸が難しく、８０℃が延伸可能な最
低延伸温度であり、延伸温度は８０℃で行った。フィル
ム物性を第１表に示したが、この２軸延伸フイルムは、
軟質な割りには低温収縮性がそれ程よくなかった。Comparative Example 1 A biaxially stretched film was obtained under the same conditions as in Example 1 using only the propylene-α-olefin copolymer used in Example 1. However, during biaxial stretching, the stretching temperature is 7
At 0°C, uniform stretching is difficult, and 80°C is the lowest possible stretching temperature, and the stretching was carried out at 80°C. The physical properties of the film are shown in Table 1, and this biaxially stretched film has the following properties:
Although it was soft, its low-temperature shrinkability was not very good.
比較例２
実施例２において使用したプロピレン−α−オレフィン
共重合体だけを使用して、実施例１と同様の条件で２軸
延伸フイルムを得た。但し、２軸延伸時、延伸温度が７
０℃では、均一な延伸が難しく８０℃が延伸可能な最低
延伸温度であり、延伸温度は８０℃で行ったフィルム物
性を第１表に示したが、この延伸フィルムは軟質な割り
には低温収縮性がそれ程よくなかった。Comparative Example 2 A biaxially stretched film was obtained under the same conditions as in Example 1 using only the propylene-α-olefin copolymer used in Example 2. However, during biaxial stretching, the stretching temperature is 7
At 0°C, it is difficult to stretch uniformly, and 80°C is the minimum stretching temperature that can be stretched.Table 1 shows the physical properties of the film that was stretched at 80°C. The shrinkability was not that good.
比較例３
プロピレン−α−オレフィン共重合体（ブテン−１含有
量１５．１モル％、ＣＸ５９．４賀ｔχ、メルトインデ
ックス４．５ｇ／１０分）単独からなるプロピレン共重
合体１００重量部に対して、水添石油樹脂（アルコンＰ
−１２５）を６重量部添加し、その他は、実施例１と同
様にして樹脂組成物を得た。この樹脂組成物について延
伸温度を９０℃とする他は実施例１と同様の条件で２軸
延伸フイルムを得た。尚、延伸温度が９０℃未満では、
均一な延伸が不可能であった。フィルム物性を第１表に
示したが、この２軸延伸フイルムは低温収縮性が良くな
かった。Comparative Example 3 Based on 100 parts by weight of a propylene copolymer consisting solely of propylene-α-olefin copolymer (butene-1 content 15.1 mol%, CX59.4g/tχ, melt index 4.5g/10 min) Hydrogenated petroleum resin (Alcon P
A resin composition was obtained in the same manner as in Example 1 except that 6 parts by weight of -125) were added. A biaxially stretched film was obtained from this resin composition under the same conditions as in Example 1 except that the stretching temperature was 90°C. In addition, if the stretching temperature is less than 90°C,
Uniform stretching was not possible. The physical properties of the film are shown in Table 1, but this biaxially stretched film had poor low-temperature shrinkability.
比較例４
実施例４において、水添石油樹脂を添加しない他は同様
にして２軸延伸フイルムを得た。但し、２軸延伸時、延
伸温度が７０℃では均一な延伸が難しり、８０℃が延伸
可能な最低延伸温度であり、延伸温度は８０℃で行った
。フィルム物性を第１表に示したがこの２軸延伸フイル
ムは、軟質な割には、低温収縮性がそれ程良（なかった
。Comparative Example 4 A biaxially stretched film was obtained in the same manner as in Example 4 except that the hydrogenated petroleum resin was not added. However, during biaxial stretching, it is difficult to achieve uniform stretching at a stretching temperature of 70°C, and 80°C is the lowest possible stretching temperature, and the stretching temperature was 80°C. The physical properties of the film are shown in Table 1. Although this biaxially stretched film was soft, its low-temperature shrinkability was not so good.
比較例５
実施例５において使用したプロピレン−α−オレフィン
共重合体だけを使用して、実施例１と同様の条件で２軸
延伸フイルムを得た。フィルム物性を第１表に示したが
、この２軸延伸フイルムは、低温収縮性は良好であった
が、過度に軟質であり、ブロッキングも幾分悪いもので
あった。Comparative Example 5 A biaxially stretched film was obtained under the same conditions as in Example 1 using only the propylene-α-olefin copolymer used in Example 5. The physical properties of the film are shown in Table 1. Although this biaxially stretched film had good low-temperature shrinkability, it was excessively soft and had somewhat poor blocking.
比較例６
プロピレン−ランダム共重合体（住友化学工業■製ノー
ブレン＠ ＲＷ１６０ ）１００重量部に対して、水添
石油樹脂（アルコンＰ−１１５、軟化点（環球法）１１
５℃）を２０重量部添加し、その他は、実施例１と同様
にして樹脂組成物を得た。この樹脂組成物について、実
施例１と同様の条件で２軸延伸フイルムを得た。フィル
ム物性を第１表に示したが、この２軸延伸フイルムは、
耐ブロッキング特性が極めて悪いものであった。Comparative Example 6 Hydrogenated petroleum resin (Alcon P-115, softening point (ring and ball method): 11
A resin composition was obtained in the same manner as in Example 1 except that 20 parts by weight of 5°C) were added. A biaxially stretched film was obtained from this resin composition under the same conditions as in Example 1. The physical properties of the film are shown in Table 1, and this biaxially stretched film has the following properties:
The blocking resistance was extremely poor.
比較例７
プロピレン−ランダム共重合体（住友化学工業■製ノー
ブレン＠ＲＷ１６０）１００重量部に対して、水添石油
樹脂（アルコンＰ−１２５）を５重量部添加し、その他
は実施例１と同様にして、樹脂組成物を得た。この樹脂
組成物について延伸温度を１００℃とする他は、実施例
１と同様の条件で２軸延伸フイルムを得た。尚、延伸温
度が９０℃未満では均一な延伸が不可能であった。フィ
ルム物性を第１表に示したがこの２軸延伸フイルムは低
温収縮性がよくなく透明性も幾分悪かった。Comparative Example 7 5 parts by weight of hydrogenated petroleum resin (Alcon P-125) was added to 100 parts by weight of propylene-random copolymer (Noblen@RW160 manufactured by Sumitomo Chemical ■), and the rest was the same as in Example 1. A resin composition was obtained. A biaxially stretched film was obtained from this resin composition under the same conditions as in Example 1, except that the stretching temperature was 100°C. Note that uniform stretching was not possible at a stretching temperature of less than 90°C. The physical properties of the film are shown in Table 1, and this biaxially stretched film had poor low-temperature shrinkability and somewhat poor transparency.
比較例８
プロピレン−α−オレフィン共重合体として、実施例１
と同一のものの単独からなるプロピレン共重合体１００
重量部に対して、水添石油樹脂（アルコンＰ−７０、軟
化点（環球法）７０℃）を８重量部添加し、その他は、
実施例１と同様にして樹脂組成物を得た。この樹脂組成
物については実施例１と同様の条件で２軸延伸フイルム
を得た。フィルム物性を第１表に示したがこの２軸延伸
フイルムは耐ブロッキング性が悪いものであった。Comparative Example 8 As a propylene-α-olefin copolymer, Example 1
Propylene copolymer 100 consisting solely of the same as
8 parts by weight of hydrogenated petroleum resin (Alcon P-70, softening point (ring and ball method) 70°C) were added to the parts by weight, and the rest were as follows:
A resin composition was obtained in the same manner as in Example 1. A biaxially stretched film was obtained from this resin composition under the same conditions as in Example 1. The physical properties of the film are shown in Table 1, and this biaxially stretched film had poor blocking resistance.
〈発明の効果〉
本発明の方法により製造された収縮包装用フィルムは低
温収縮性が格段に優れている上に、透明性、光沢、耐ブ
ロッキング性が優れている。<Effects of the Invention> The shrink packaging film produced by the method of the present invention has not only excellent low-temperature shrinkability but also excellent transparency, gloss, and blocking resistance.
又収縮包装時コーナ一部の皺の発生が少なく、仕上がり
がきれいで、包装後の結束力も良好であった。更にポリ
塩化ビニルのような廃棄上の問題もなく、かつ安価に製
造できるという極めて大きな実用的価値を有するもので
ある。In addition, there were few wrinkles in the corners during shrink wrapping, the finish was clean, and the binding strength after wrapping was good. Furthermore, unlike polyvinyl chloride, it does not have the disposal problems and can be manufactured at low cost, so it has extremely great practical value.
Claims (2)
プロピレンと炭素数４以上のα−オレフィンとエチレン
の共重合体であって、 ［１］共重合体の炭素数４以上のα−オレフィン含有量
が８〜３５モル％ ［２］共重合体のエチレン含有量が５モル％以下［３］
共重合体の冷キシレン可溶部が１５〜７０ｗｔ％である
プロピレン−α−オレフィン共重合体を３０重量％以上
含有するプロピレン共重合体に炭化水素樹脂が２〜１０
重量部配合された樹脂組成物を、成膜後少なくとも一軸
方向に延伸処理を施してなることを特徴とする収縮包装
用フィルム。(1) A copolymer of propylene and an α-olefin having 4 or more carbon atoms, or a copolymer of propylene, an α-olefin having 4 or more carbon atoms, and ethylene, [1] The copolymer contains an α-olefin having 4 or more carbon atoms. The amount is 8 to 35 mol% [2] The ethylene content of the copolymer is 5 mol% or less [3]
A propylene copolymer containing 30% by weight or more of a propylene-α-olefin copolymer in which the cold xylene soluble portion of the copolymer is 15 to 70% by weight, and a hydrocarbon resin of 2 to 10% by weight.
A film for shrink packaging, characterized in that a resin composition containing parts by weight is subjected to a stretching treatment in at least one axis after film formation.
る特許請求の範囲第１項記載の収縮包装用フィルム。(2) The shrink wrapping film according to claim 1, wherein the α-olefin having 4 or more carbon atoms is butene-1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61260982A JPH0725959B2 (en) | 1986-10-31 | 1986-10-31 | Film for shrink wrapping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61260982A JPH0725959B2 (en) | 1986-10-31 | 1986-10-31 | Film for shrink wrapping |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63113059A true JPS63113059A (en) | 1988-05-18 |
| JPH0725959B2 JPH0725959B2 (en) | 1995-03-22 |
Family
ID=17355433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61260982A Expired - Fee Related JPH0725959B2 (en) | 1986-10-31 | 1986-10-31 | Film for shrink wrapping |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0725959B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0391740A2 (en) * | 1989-04-07 | 1990-10-10 | Chisso Corporation | Dulled stretched moulding and process for producing the same |
| JPH02283740A (en) * | 1989-04-24 | 1990-11-21 | Chisso Corp | Polyolefin composition for shrinking film |
| JP2002069266A (en) * | 2000-08-30 | 2002-03-08 | Sumitomo Chem Co Ltd | Shrinkable packaging film and label |
| EP1388559A1 (en) * | 2002-08-09 | 2004-02-11 | Toyo Boseki Kabushiki Kaisha | Heat-shrinkable polyolefin film |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4999645A (en) * | 1973-01-26 | 1974-09-20 | ||
| JPS53113692A (en) * | 1977-03-15 | 1978-10-04 | Mitsui Petrochemical Ind | Film for shrink packing |
| JPS60127133A (en) * | 1983-12-14 | 1985-07-06 | Sumitomo Chem Co Ltd | Film for shrink package |
| JPS624735A (en) * | 1985-07-02 | 1987-01-10 | Ube Ind Ltd | Highly shrinkable polyolefin film |
-
1986
- 1986-10-31 JP JP61260982A patent/JPH0725959B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4999645A (en) * | 1973-01-26 | 1974-09-20 | ||
| JPS53113692A (en) * | 1977-03-15 | 1978-10-04 | Mitsui Petrochemical Ind | Film for shrink packing |
| JPS60127133A (en) * | 1983-12-14 | 1985-07-06 | Sumitomo Chem Co Ltd | Film for shrink package |
| JPS624735A (en) * | 1985-07-02 | 1987-01-10 | Ube Ind Ltd | Highly shrinkable polyolefin film |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0391740A2 (en) * | 1989-04-07 | 1990-10-10 | Chisso Corporation | Dulled stretched moulding and process for producing the same |
| AU624696B2 (en) * | 1989-04-07 | 1992-06-18 | Chisso Corporation | Dulled stretched molding and process for producing the same |
| JPH02283740A (en) * | 1989-04-24 | 1990-11-21 | Chisso Corp | Polyolefin composition for shrinking film |
| JP2002069266A (en) * | 2000-08-30 | 2002-03-08 | Sumitomo Chem Co Ltd | Shrinkable packaging film and label |
| JP4491938B2 (en) * | 2000-08-30 | 2010-06-30 | 住友化学株式会社 | Shrink wrapping film and label |
| EP1388559A1 (en) * | 2002-08-09 | 2004-02-11 | Toyo Boseki Kabushiki Kaisha | Heat-shrinkable polyolefin film |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0725959B2 (en) | 1995-03-22 |
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