【発明の詳細な説明】本発明は、酢酸ビニール−エチレン共重合体複合延伸フ
ィルムに関するものであり、更に詳しく ユ述べるなら
ば、耐候性、保温性、光線透過率および強度のすぐれた
酢酸ビニール−エチレン共重合体複合延伸フィルムに関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stretched vinyl acetate-ethylene copolymer composite film. This invention relates to an ethylene copolymer composite stretched film.
透明な合成樹脂フィルムは、農業用、包装用などに膨大
な需用を有するものであつて、特に、ポ Ｊり塩化ビニ
ールフィルム、ポリエチレンフィルムおよび、酢酸ビニ
ール−エチレン共重合体フィルムは農業用に広い用途を
有している。Transparent synthetic resin films are in huge demand for agricultural purposes, packaging, etc. In particular, polyvinyl chloride films, polyethylene films, and vinyl acetate-ethylene copolymer films are used for agricultural purposes. It has a wide range of uses.
ポリ塩化ビニールフィルムは、耐候性および保温性にす
ぐれ、光線透過性や作業性なども良好であるが、強度が
、’低いため比較的厚さを厚くして使用しなければな
らないこと、比重が比較的大きいこと、軟質材料。では
その中に混入される可塑剤（主として、ジー２−エチル
ヘキシルフタレート（ＤＯＰ））及び安定剤の毒性およ
び硬質材料では、耐寒性が低いことなどが問題になつて
いる。ポリエチレンフィ５ ルムは、軽量であり、耐寒
性にすぐれているが、保温性、光透過性および耐候性が
低いという問題点がある。農業用として使用されている
酢酸ビニール−エチレン共重合体フィルムは、一般に、
６重量弊以１０下の酢酸ビニールを含む低酢酸ビニール
型のものであつて、その性能は、前記ポリ塩化ビニール
フィルムと、ポリエチレンフィルムとの中間にある。PVC film has excellent weather resistance and heat retention, as well as good light transmittance and workability, but its strength is low, so it must be used relatively thick, and its specific gravity is low. Relatively large size, soft material. Problems include the toxicity of the plasticizer (mainly di-2-ethylhexyl phthalate (DOP)) and stabilizer mixed therein, and the low cold resistance of the hard material. Although polyethylene film is lightweight and has excellent cold resistance, it has problems in that it has low heat retention, light transmittance, and weather resistance. Vinyl acetate-ethylene copolymer films used for agricultural purposes are generally
It is a low-vinyl acetate type film containing vinyl acetate of 6 to 10 parts by weight, and its performance is between that of the polyvinyl chloride film and that of polyethylene film.
しかし、酢酸ビニール含有率が低いので、一般に、その
性能は、ポリ塩化ビニールフィルムよりも、１５ポリエ
チレンフィルムに近いものである。酢酸ビニール−エチ
レン共重合体の酢酸ビニール含有率を６％以上に高める
と、その保温性、光透過性などはポリ塩化ビニールフィ
ルムに近づき、強度もすぐれているがその反面ブロッキ
ング性が高くなフ０ り実用性が低下する。このような
高酢酸ビニール含有共重合体フィルムの欠点を防止する
ために、フィルム表面に無機粉体をふりかけたり、ナイ
ロンワイヤーでフィルム表面に微細な傷をつけたりする
方法が考えられているが、このような処置は、フ５ 当
然フィルムの光透過性を低下させることになる。従つて
、従来のポリ塩化ビニールフィルム、ポリエチレンフィ
ルムおよび酢酸ビニール−エチレン共重合体フィルムな
どの問題点を解決した新らしい透明フィルム材料の出現
が強く望まれていた。！０ 本発明の目的は、上述のよ
うな従来の透明フィルムの欠点を解消し、高強度で、比
較的軽量であり、保温性、光透過性、耐光性にすぐれ、
しかも毒性のない複合延伸フィルムを提供することにあ
る。ι５ 上記目的は、本発明の複合フィルムによつて
達成される。However, because of the lower vinyl acetate content, its performance is generally closer to 15 polyethylene film than to polyvinyl chloride film. When the vinyl acetate content of the vinyl acetate-ethylene copolymer is increased to 6% or more, its heat retention properties and light transmittance approach those of polyvinyl chloride film, and its strength is also excellent, but on the other hand, it becomes a film with high blocking properties. 0, the practicality decreases. In order to prevent these drawbacks of high vinyl acetate-containing copolymer films, methods have been considered such as sprinkling inorganic powder on the film surface or making minute scratches on the film surface with a nylon wire. Such treatment naturally reduces the light transmittance of the film. Therefore, there has been a strong desire for a new transparent film material that solves the problems of conventional polyvinyl chloride films, polyethylene films, and vinyl acetate-ethylene copolymer films. ! 0 The purpose of the present invention is to eliminate the drawbacks of the conventional transparent film as described above, to produce a film that has high strength, is relatively lightweight, and has excellent heat retention, light transmittance, and light resistance.
Moreover, it is an object of the present invention to provide a composite stretched film that is not toxic. ι5 The above object is achieved by the composite film of the present invention.
本発明の複合延伸フィルムは、積層された３層よりなる
複合フィルムであつて、ごりその中心層が、６重量％を
こえる量の醋酸ビニルと残余の量のエチレンとの共重合
体からなり、かつ二軸延伸されたフイルムから構成され
ており、両表面層が、高密度ポリエチレンからなり、か
つ少くとも一軸延伸されたフイルムにより構成されてい
ることを特徴とするものである。The composite stretched film of the present invention is a composite film consisting of three laminated layers, the center layer of which is composed of a copolymer of more than 6% by weight of vinyl acetate and the remaining amount of ethylene. , and is made of a biaxially stretched film, and both surface layers are made of high-density polyethylene and are made of at least a uniaxially stretched film.
本発明の複合延伸フイルムの中心層は、６重量？をこえ
る量、好ましくは１０重量？以上の醋酸ビニールを含有
する高酢酸ビニール含有エチレン共重合体から形成され
ているが、その両面に積層された表面層は、高密度ポリ
エチレンすなわち、中圧法又は低圧法によつて製造され
たポリエチレンにより形成されている。The center layer of the composite stretched film of the present invention has a weight of 6? , preferably 10 weight? It is made of high-vinyl acetate-containing ethylene copolymer containing vinyl acetate as described above, but the surface layer laminated on both sides is made of high-density polyethylene, that is, polyethylene manufactured by a medium-pressure method or a low-pressure method. It is formed.
中心層を形成するフイルムは二軸に延伸されており、表
面層を形成するフイルムは一軸または二軸に延伸されて
いる。各層の厚さは用途によつて任意に定めることがで
きるが一般には、中心層の厚さが３０〜１００μであり
、表面層の厚さが５〜５０μであることが好ましい。本
発明複合延伸フイルムは低酢酸ビニール含有エチレン共
重合体よりもかなり透明性の低い低密度ポリエチレンを
、その両外層に有しているものであるが、これを延伸す
ることによつて驚ろくべきことに、その光透過度は、低
酢酸ビニール含有エチレン共重合体のみで形成されてい
るフイルムとほぼ同等または、それよりも却つて高くな
ることが見出された。The film forming the center layer is biaxially stretched, and the film forming the surface layer is uniaxially or biaxially stretched. Although the thickness of each layer can be arbitrarily determined depending on the application, it is generally preferable that the thickness of the center layer is 30 to 100 μm, and the thickness of the surface layer is 5 to 50 μm. The composite stretched film of the present invention has low-density polyethylene, which has considerably lower transparency than a low-vinyl acetate-containing ethylene copolymer, in both outer layers. In particular, it has been found that the light transmittance thereof is almost equal to or even higher than that of a film formed only from a low vinyl acetate-containing ethylene copolymer.
また、得られる延伸フイルムは極めて高い抗張力および
引裂強度を有するため、フイルムの厚さを他種フイルム
の市販品よりもうすくすることが可能になる。このこと
は、後に実施例の第１表によつて明瞭に示されるであろ
う。本発明の複合延伸フイルムは任意の複合方法によつ
て製造することができるが、例えば、下記のような方法
であつてもよい。高酢酸ビニール含有エチレン共重合体
を押出機に供給し１５０含Ｃ〜２５０℃の温度で溶融し
、この溶融体をＴ−ダイを通して押し出してフイルムを
形成し、このフイルムをその縦方向に３〜５倍に延伸す
る。Furthermore, since the resulting stretched film has extremely high tensile strength and tear strength, it is possible to make the film thinner than commercially available films of other types. This will be clearly shown below by Table 1 of the Examples. The composite stretched film of the present invention can be manufactured by any composite method, and for example, the following method may be used. A high vinyl acetate-containing ethylene copolymer is fed into an extruder and melted at a temperature of 150°C to 250°C, and the melt is extruded through a T-die to form a film, which is rolled in the longitudinal direction from 3 to 250°C. Stretch it 5 times.
別に、高密度ポリエチレン又は低酢酸ビニール含有エチ
レン共重合体を押出機で１５０〜２００℃の温度で溶融
し、この溶融体をＴ−ダイを通して押し出して２枚のフ
イルムを形成し、この２枚のフイルムの間に、前記高酢
酸ビニール含有エチレン共重合体フイルムを積層する。Separately, high-density polyethylene or low vinyl acetate-containing ethylene copolymer is melted in an extruder at a temperature of 150-200°C, and the melt is extruded through a T-die to form two films. The high vinyl acetate-containing ethylene copolymer film is laminated between the films.
この積層体を、その横方向に４〜１０倍に延伸すれば、
３枚のフイルムは一体に接着し、高強力の透明な複合フ
イルムが得られる。本発明の複合延伸フイルムは、中心
層と両表面層とを共押出法により同時に形成結着し、こ
れを一段二軸又は二段二軸延伸することによつても製造
される。本発明の複合フイルムは、耐候性、光透過性、
保温性にすぐれ、しかもプロツキングを発生することが
ないので、多くの用途、特に農業用フイルムとして極め
て高い実用性を有している。If this laminate is stretched 4 to 10 times in the transverse direction,
The three films are glued together to obtain a highly strong, transparent composite film. The composite stretched film of the present invention can also be produced by simultaneously forming and binding a center layer and both surface layers by a coextrusion method, and then biaxially stretching the film in one step or biaxially in two steps. The composite film of the present invention has weather resistance, light transmittance,
Since it has excellent heat retention properties and does not cause blocking, it has extremely high practicality in many uses, especially as an agricultural film.
本発明の複合フイルムを実施例により更に詳しく説明す
る。The composite film of the present invention will be explained in more detail with reference to Examples.
実施例高酢酸ビニール含有エチレン共重合体として、２０重量
％の酢酸ビニールと、残余の量のエチレンとの共重合物
（商品名、ユカロンＥＶＡ５ＯＭｌ三菱油化製）を押出
機で２００′Ｃで溶融し、この溶融物をＴ−ダイを通し
て押し出し、これをその縦方向に約１３０゜Ｃで約４倍
に延伸して厚さ４００μの一軸延伸フイルムを製造した
。Example As a high vinyl acetate-containing ethylene copolymer, a copolymer of 20% by weight of vinyl acetate and the remaining amount of ethylene (trade name, Yucalon EVA5OMl manufactured by Mitsubishi Yuka) was melted at 200'C using an extruder. This melt was then extruded through a T-die and stretched in the longitudinal direction at about 130° C. to about 4 times the original length to produce a uniaxially stretched film having a thickness of 400 μm.
別に、高密度ポリエ手レン（商品名、ユカロンＨＤＥＺ
４Ｏ三菱油化製）を押出機２３０℃で溶融し、この溶融
物をＴ−ダイを通して押し出して厚さ８０μの２枚のポ
リエチレンフイルムを作り、この２枚のフイルムを、前
記高酢酸ビニール含有工手レン共重合体フイルムの両面
に積層し、この積層体を１３０℃でその横方向に８倍に
延伸した。Separately, high-density polyethylene (trade name, Yucalon HDEZ)
4O (manufactured by Mitsubishi Yuka) was melted at 230°C in an extruder, the melt was extruded through a T-die to make two 80μ thick polyethylene films, and these two films were processed into the high vinyl acetate-containing process described above. It was laminated on both sides of a hand-lens copolymer film, and the laminate was stretched 8 times in the transverse direction at 130°C.
得られた複合フイルムの厚さは７０μであつて、中心層
の厚さは５０μ、両表面層の厚さはそれぞれ１０μであ
つた。この複合フイルムの性能は第１表に示されている
。第１表から明らかなように、本発明の複合延伸フイル
ムは０．０７ｍｍといううすさにも拘らず、極めて高い
モジユラス、抗張力および引裂強度を有し、しかも光透
過性もすぐれたものであつた。The thickness of the obtained composite film was 70μ, the thickness of the center layer was 50μ, and the thickness of both surface layers was 10μ. The performance of this composite film is shown in Table 1. As is clear from Table 1, despite its thinness of 0.07 mm, the composite stretched film of the present invention had extremely high modulus, tensile strength, and tear strength, and also had excellent light transmittance. .
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14204479AJPS5915311B2 (en) | 1979-11-05 | 1979-11-05 | composite stretched film |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14204479AJPS5915311B2 (en) | 1979-11-05 | 1979-11-05 | composite stretched film |
| Publication Number | Publication Date |
|---|---|
| JPS5569455A JPS5569455A (en) | 1980-05-26 |
| JPS5915311B2true JPS5915311B2 (en) | 1984-04-09 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14204479AExpiredJPS5915311B2 (en) | 1979-11-05 | 1979-11-05 | composite stretched film |
| Country | Link |
|---|---|
| JP (1) | JPS5915311B2 (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IL122138A (en)* | 1997-11-07 | 2000-10-31 | Uri Peled | Multilayer plastic film for crop cultivation and controlling insects |
| TWI758301B (en)* | 2016-06-28 | 2022-03-21 | 美商陶氏全球科技有限責任公司 | Multilayer films, articles comprising the same, methods of manufacturing multilayer films |
| Publication number | Publication date |
|---|---|
| JPS5569455A (en) | 1980-05-26 |
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