JPH08269265A - Thermally shrinkable polypropylene film - Google Patents
Thermally shrinkable polypropylene filmInfo
- Publication number
- JPH08269265A JPH08269265A JP9592295A JP9592295A JPH08269265A JP H08269265 A JPH08269265 A JP H08269265A JP 9592295 A JP9592295 A JP 9592295A JP 9592295 A JP9592295 A JP 9592295A JP H08269265 A JPH08269265 A JP H08269265A
- Authority
- JP
- Japan
- Prior art keywords
- propylene
- weight
- fine particles
- film
- olefin
- 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
Landscapes
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はポリプロピレン系熱収縮
性フィルムに関し、より詳しくは透明性に優れ、かつ、
滑り性、耐ブロッキング性が良好なポリプロピレン系熱
収縮性フィルムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polypropylene heat-shrinkable film, and more specifically, it has excellent transparency and
The present invention relates to a polypropylene-based heat-shrinkable film having excellent slipperiness and blocking resistance.
【０００２】[0002]
【従来の技術】従来、熱収縮性フィルムとしては、ポリ
塩化ビニル、ポリプロピレン、ポリエチレン等の延伸フ
ィルムが知られているが、低価格、使用後の廃棄処理の
容易さなどからポリプロピレン系、ポリエチレン系等の
ポリオレフィン系熱収縮性フィルムが好んで用いられて
いる。そのなかで、ポリプロピレン系熱収縮性フィルム
はフィルムの腰があり、透明性、包装機械適性は優れて
いるものの、比較的高温でないと収縮しない等の欠点を
有している。ポリプロピレン系熱収縮性フィルムに低温
収縮性を持たせる方法として、ポリプロピレン系樹脂に
ポリプロピレン系樹脂より軟化温度が低く、分子量分布
が広い、プロピレン−ブテン−１共重合体等のプロピレ
ン−α−オレフィン共重合体をブレンドする方法が特公
昭５７−２４３７５号公報等で提案されている。2. Description of the Related Art Conventionally, as heat-shrinkable films, stretched films of polyvinyl chloride, polypropylene, polyethylene and the like have been known, but polypropylene-based and polyethylene-based films are low in cost and easy to dispose of after use. Polyolefin-based heat-shrinkable films such as the above are preferably used. Among them, polypropylene-based heat-shrinkable films have film flexibility and are excellent in transparency and suitability for packaging machines, but have the drawback that they do not shrink unless the temperature is relatively high. As a method for imparting low-temperature shrinkability to a polypropylene-based heat-shrinkable film, a polypropylene-based resin having a lower softening temperature and a wider molecular weight distribution than a polypropylene-based resin, such as a propylene-α-olefin copolymer such as a propylene-butene-1 copolymer. A method of blending a polymer is proposed in Japanese Patent Publication No. 57-24375.
【０００３】熱収縮性フィルムはシュリンク包装に使わ
れるフィルムであるが、シュリンク包装は、一般的に
は、熱収縮性フィルムで余裕率をもって包んだ被包装物
を、熱風が吹き出しているトンネルを通過させることで
熱収縮性フィルムが収縮して被包装物にタイトな包装を
完成させる方法であるため、熱収縮直後のフィルム表面
の温度は５０℃以上の高温になっている。そのため、熱
収縮性フィルムには、包装時のトンネル通過以前の製袋
及び包装機械でのフィルム走行に関する常温でのフィル
ムとフィルムの滑り性や、常温でのフィルムと金属面の
滑り性だけでなく、トンネル通過中或いはトンネル通過
直後の包装機械でのフィルム走行に関係する高温でのフ
ィルムと金属面との滑り性、更には、被包装物との滑り
性、トンネルでの収縮直後の包装体の箱詰め、梱包工程
に関する高温でのフィルムとフィルムの滑り性、いわゆ
るホットスリップや包装体と包装体が密着しないための
耐ブロッキング性が要求される。The heat-shrinkable film is a film used for shrink wrapping. In the shrink wrapping, generally, an object to be wrapped wrapped with the heat-shrinkable film with a margin is passed through a tunnel in which hot air blows. Since this is a method of shrinking the heat-shrinkable film to complete tight packaging on the object to be packaged, the temperature of the film surface immediately after heat shrinkage is as high as 50 ° C or higher. Therefore, the heat-shrinkable film has not only the slipperiness between the film and the film at room temperature and the slipperiness between the film and the metal surface at room temperature, which is related to the film making before passing through the tunnel at the time of packaging and the film running on the packaging machine. , Slipperiness between a film and a metal surface at high temperature, which is related to film traveling in a packaging machine during or immediately after passing through a tunnel, and further slipperiness with an object to be packaged, of a package immediately after shrinking in a tunnel. Film-to-film slipperiness at high temperatures in the boxing and packing processes, so-called hot-slip, and blocking resistance to prevent close contact between packages and packages are required.
【０００４】上記軟化温度が低いプロピレン−α−オレ
フィン共重合体等をブレンドする方法は、低温収縮性に
ついては改善効果がみられるものの、滑り性、耐ブロッ
キング性については不十分で、特に、高温での滑り性が
極端に悪くなるため、箱詰めが困難になったり、包装仕
上がりが悪くなったりするという欠点を有していた。か
かるポリプロピレン系熱収縮性フィルムの滑り性を改善
する方法として、微粒子を添加する方法（例えば、特開
昭５７−６４５２２号公報、特開昭６２−３９２１９号
公報等）が報告されている。The method of blending a propylene-α-olefin copolymer or the like having a low softening temperature has an effect of improving low-temperature shrinkage, but is insufficient in slipperiness and blocking resistance, and particularly at high temperature. Since it has extremely poor slipperiness at the time, it has a drawback that it becomes difficult to pack in a box and the packaging finish becomes poor. As a method for improving the slipperiness of the polypropylene heat-shrinkable film, a method of adding fine particles (for example, JP-A-57-64522 and JP-A-62-39219) has been reported.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、微粒子
等の添加剤を多量に添加することで滑り性は改善はでき
るものの、透明性が劣るという欠点があり、シュリンク
包装工程の収縮前から収縮後まで全ての工程で、低温収
縮性は維持したまま、良好な滑り性と透明性を両立させ
るのが困難であった。本発明の目的は、低温収縮性に優
れ、かつ、収縮前から収縮後まで、良好な透明性を有
し、かつ、滑り性、耐ブロッキング性に優れた、収縮仕
上がりが良好なポリプロピレン系熱収縮性フィルムを提
供することにある。However, although the slipperiness can be improved by adding a large amount of additives such as fine particles, there is a disadvantage that the transparency is poor, and the shrink packaging process from before shrinking to after shrinking. In all steps, it was difficult to achieve both good slipperiness and transparency while maintaining low-temperature shrinkability. The object of the present invention is excellent in low-temperature shrinkage, and has good transparency from before shrinkage to after shrinkage, and has excellent slipperiness and blocking resistance, and a polypropylene-based heat shrinkage with a good shrink finish. To provide a transparent film.
【０００６】[0006]
【課題を解決するための手段】本発明者等は、かかる課
題を解決すべく鋭意研究を重ねた結果、結晶性プロピレ
ン−α−オレフィン共重合体（Ａ）とプロピレン−α−
オレフィン共重合体（Ｂ）からなる樹脂組成物（Ｃ）
に、特定の２つの異なる平均粒子径をもつ球状の微粒子
を組み合わせて使用することにより、低温収縮性を維持
したまま、透明性が低下することなく、収縮前後の滑り
性に優れたフィルムが得られることを見いだし、本発明
に到達した。すなわち、本発明は、プロピレンに対して
α−オレフィンの共重合の割合が９重量％以下の結晶性
プロピレン−α−オレフィン共重合体（Ａ）７０〜９０
重量部とプロピレンに対してα−オレフィンの共重合の
割合が１０〜４５重量％のプロピレン−α−オレフィン
共重合体（Ｂ）３０〜１０重量部からなる樹脂組成物
（Ｃ）１００重量部に対して、平均粒子径が０．８〜
１．５μの球状無機微粒子（Ｄ）２５００〜７０００ｐ
ｐｍと、平均粒子径が２〜６μの球状ポリメチルメタク
リレート微粒子（Ｅ）５００〜２５００ｐｐｍを、トー
タルの微粒子添加量が４０００〜８０００ｐｐｍとなる
ように配合した、低温収縮性に優れ、かつ、透明性、滑
り性、耐ブロッキング性にも優れたポリプロピレン系熱
収縮性フィルムである。Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have found that the crystalline propylene-α-olefin copolymer (A) and propylene-α-
Resin composition (C) comprising olefin copolymer (B)
In addition, by using spherical fine particles having two specific different average particle sizes in combination, it is possible to obtain a film excellent in slipperiness before and after shrinkage without lowering transparency while maintaining low-temperature shrinkability. As a result, they have reached the present invention. That is, the present invention provides a crystalline propylene-α-olefin copolymer (A) 70 to 90 in which the ratio of α-olefin copolymerization to propylene is 9% by weight or less.
100 parts by weight of a resin composition (C) consisting of 30 to 10 parts by weight of a propylene-α-olefin copolymer (B) having a copolymerization ratio of 10 to 45% by weight with respect to propylene. On the other hand, the average particle size is 0.8-
1.5μ spherical inorganic fine particles (D) 2500-7000p
pm and 500 to 2500 ppm of spherical polymethylmethacrylate fine particles (E) having an average particle diameter of 2 to 6 μ were blended so that the total amount of added fine particles would be 4000 to 8000 ppm, and excellent in low-temperature shrinkability and transparency. It is a polypropylene-based heat-shrinkable film excellent in slipperiness and blocking resistance.
【０００７】本発明で用いられる結晶性プロピレン−α
−オレフィン共重合体（Ａ）は一般にポリプロピレン系
樹脂と言われるものであり、α−オレフィンとしてはエ
チレン或いはブテン−１等の１種または２種以上が用い
られ、しかも共重合の割合はプロピレンに対して９重量
％程度までのものである。結晶性プロピレン−α−オレ
フィン共重合体（Ａ）は２元共重合体または３元共重合
体、あるいはそれらの混合物である。The crystalline propylene-α used in the present invention
The olefin copolymer (A) is generally called a polypropylene resin, and one or more kinds of ethylene or butene-1 is used as the α-olefin, and the copolymerization ratio is propylene. On the other hand, it is up to about 9% by weight. The crystalline propylene-α-olefin copolymer (A) is a binary copolymer, a ternary copolymer, or a mixture thereof.
【０００８】また、本発明で用いられるプロピレン−α
−オレフィン共重合体（Ｂ）は、プロピレンとα−オレ
フィンとの共重合体であるが、プロピレンと共重合する
α−オレフィンの割合が１０〜４５重量％と多いことで
結晶性プロピレン−α−オレフィン共重合体（Ａ）とは
区別されるものである。尚、プロピレンと共重合させる
α−オレフィンとしてはエチレン、ブテン−１等があげ
られ、それ等の１種または２種以上が用いられ、好まし
くは、プロピレン−α−オレフィン共重合体（Ｂ）はビ
カット軟化点が８０〜１１５℃、ＭＦＲ（２３０℃、
２．１６ｋｇ）が２．０〜９．０ｇ／１０分で、更に好
ましくは、ＭＦＲ（２３０℃、２．１６ｋｇ）が５．５
〜８．０ｇ／１０分のプロピレン−α−オレフィン共重
合体が望ましい。Further, propylene-α used in the present invention
-The olefin copolymer (B) is a copolymer of propylene and α-olefin, but since the proportion of α-olefin copolymerized with propylene is as large as 10 to 45% by weight, crystalline propylene-α-. It is distinguished from the olefin copolymer (A). As the α-olefin copolymerized with propylene, ethylene, butene-1 and the like can be mentioned, and one kind or two or more kinds thereof are used. Preferably, the propylene-α-olefin copolymer (B) is Vicat softening point is 80-115 ° C, MFR (230 ° C,
2.16 kg) is 2.0 to 9.0 g / 10 minutes, more preferably MFR (230 ° C., 2.16 kg) is 5.5.
A propylene-α-olefin copolymer of ˜8.0 g / 10 min is desirable.
【０００９】結晶性プロピレン−α−オレフィン共重合
体（Ａ）とプロピレン−α−オレフィン共重合体（Ｂ）
の混合量は、結晶性プロピレン−α−オレフィン共重合
体（Ａ）７０〜９０重量部とプロピレン−α−オレフィ
ン共重合体（Ｂ）３０〜１０重量部、好ましくは結晶性
プロピレン−α−オレフィン共重合体（Ａ）７５〜８５
重量部とプロピレン−α−オレフィン共重合体（Ｂ）２
５〜１５重量部である。プロピレン−α−オレフィン共
重合体（Ｂ）の混合量が１０重量部未満では低温収縮性
が発現せず、３０重量部を越えるとフィルムの腰がなく
なり、滑り性、ホットスリップが極端に悪くなり、結果
として、包装機械適性が非常に悪くなる。Crystalline propylene-α-olefin copolymer (A) and propylene-α-olefin copolymer (B)
70 to 90 parts by weight of the crystalline propylene-α-olefin copolymer (A) and 30 to 10 parts by weight of the propylene-α-olefin copolymer (B), preferably crystalline propylene-α-olefin. Copolymer (A) 75-85
Parts by weight and propylene-α-olefin copolymer (B) 2
5 to 15 parts by weight. When the mixing amount of the propylene-α-olefin copolymer (B) is less than 10 parts by weight, low-temperature shrinkage does not appear, and when it exceeds 30 parts by weight, the film loses its rigidity and slipperiness and hot slip are extremely deteriorated. As a result, the suitability for the packaging machine becomes very poor.
【００１０】本発明において、樹脂組成物に球状微粒子
が添加されるが、球状微粒子としては、主として金属面
との滑り性、ホットスリップに影響する平均粒子径が
０．８〜１．５μの球状無機微粒子（Ｄ）と、主として
耐ブロッキング性とフィルム同志の滑り性に影響する平
均粒子径が２〜６μの球状ポリメチルメタクリレート微
粒子（Ｅ）とを組み合わせて添加される。小径の微粒子
（Ｄ）としては、粒度分布が狭く、硬い方がホットスリ
ップや金属面とフィルムの滑り性の改善効果が大きいこ
とから、無機微粒子が使用され、例えば、球状シリカ、
ゼオライト等を例示することができる。無機微粒子
（Ｄ）の平均粒子径が０．８μより小さければ、熱収縮
フィルムと金属面との滑り性とホットスリップの改善効
果は小さく、１．５μより大きいと透明性の低下が大き
い割には熱収縮フィルムと金属面との滑り性とホットス
リップの改善効果は大きくない。In the present invention, spherical fine particles are added to the resin composition. As the spherical fine particles, spherical particles having an average particle diameter of 0.8 to 1.5 μ, which mainly affects the slidability with a metal surface and hot slip, are used. The inorganic fine particles (D) and the spherical polymethylmethacrylate fine particles (E) having an average particle diameter of 2 to 6 μ, which mainly affects the blocking resistance and the slipperiness of the films, are added in combination. As the small-diameter fine particles (D), inorganic fine particles are used because a narrower particle size distribution and a harder one are more effective in improving the slip property between a metal surface and a film, and for example, spherical silica,
Zeolite etc. can be illustrated. If the average particle size of the inorganic fine particles (D) is smaller than 0.8 μ, the effect of improving the slipperiness between the heat-shrinkable film and the metal surface and the hot slip is small, and if it is larger than 1.5 μ, the transparency is greatly reduced. Is not very effective in improving the slipperiness between the heat shrink film and the metal surface and the hot slip.
【００１１】一方、大径の微粒子（Ｅ）としては、透明
性に対する影響が特に大きく、収縮前だけではなく、収
縮後の透明性の低下を避けるにはフィルムの原料となっ
ている結晶性プロピレン−α−オレフィン共重合体
（Ａ）とプロピレン−α−オレフィン共重合体（Ｂ）の
屈折率とほぼ等しい屈折率１．４８〜１．５０を持つ、
ポリメチルメタクリレートの球状ポリマー微粒子が使用
される。該微粒子は、フィルム原料への分散性がよく、
熱分解温度が２５０℃以上で、製造過程で不融であるた
め透明性の低下が非常に小さい。平均粒子径が２μ以上
であれば、フィルムとフィルムの滑り性やフィルムロー
ルのブロッキングを防ぐ効果が現れるが、粒子径が大き
い粒子は透明性への影響が大きく、平均粒子径が６μを
越えるものは透明性の低下が著しく、かつ、滑り性、耐
ブロッキング性の改善効果もあまり大きくない。On the other hand, as the large-diameter particles (E), the influence on the transparency is particularly large, and in order to avoid a decrease in the transparency not only before shrinkage but also after shrinkage, crystalline propylene which is a raw material of the film. Has a refractive index of 1.48 to 1.50 which is almost equal to the refractive index of the α-olefin copolymer (A) and the propylene-α-olefin copolymer (B).
Spherical polymer particles of polymethylmethacrylate are used. The fine particles have good dispersibility in the film raw material,
Since the thermal decomposition temperature is 250 ° C. or higher and the material is infusible during the manufacturing process, the decrease in transparency is very small. If the average particle size is 2 μm or more, the effect of preventing the slipping property between the film and the film and the blocking of the film roll appears, but the particles having a large particle size greatly affect the transparency, and the average particle size exceeds 6 μm. Has a significant decrease in transparency, and the effect of improving slipperiness and blocking resistance is not so great.
【００１２】これら微粒子は、樹脂組成物（Ｃ）１００
重量部に対して、球状無機微粒子（Ｄ）２５００〜７０
００ｐｐｍと、球状ポリメチルメタクリレート微粒子
（Ｅ）５００〜２５００ｐｐｍを、トータルの微粒子の
添加量が４０００〜８０００ｐｐｍ、好ましくは５００
０〜７０００ｐｐｍとなるよう添加される。微粒子のト
ータルの添加量、あるいはどちらか片方、あるいは両方
の微粒子の添加量が本発明の添加量範囲より少ないと、
低温収縮性、透明性は良いが、収縮後の滑り性が悪くな
り、また添加量が多いと、低温収縮性、滑り性は良好で
あるが収縮後の透明性が悪くなる。These fine particles are contained in the resin composition (C) 100.
Spherical inorganic fine particles (D) 2500 to 70 parts by weight
00 ppm and spherical polymethylmethacrylate fine particles (E) 500 to 2500 ppm, and the total amount of fine particles added is 4000 to 8000 ppm, preferably 500.
It is added so as to be 0 to 7,000 ppm. If the total addition amount of the fine particles, or one or both of the addition amounts of the fine particles is less than the addition amount range of the present invention,
Good low-temperature shrinkability and transparency, but poor slipperiness after shrinkage. When a large amount is added, low-temperature shrinkability and slipperiness are good, but transparency after shrinkage is poor.
【００１３】原料の樹脂に配合された球状無機微粒子、
球状ポリメチルメタクリレート微粒子は、押出機での溶
融混練を経て、ダイスのリップ口から押し出されるまで
不融で、球形を保ち、延伸工程等で剥がれ落ちたり、ボ
イドを生じることがない。そのため、本発明のフィルム
はリサイクルしても、球状微粒子の変形、脱落による透
明性低下や滑り性等の性能低下がないことも、本発明の
特徴の一つである。Spherical inorganic fine particles blended with the raw material resin,
The spherical polymethylmethacrylate microparticles are melted and kneaded in an extruder and are infusible until they are extruded from the lip port of the die, remain spherical, and do not peel off or form voids in a stretching process or the like. Therefore, it is also one of the features of the present invention that the film of the present invention does not deteriorate in performance such as transparency and slipperiness due to deformation and dropping of spherical fine particles even when recycled.
【００１４】また、特定の微粒子配合にすることで、熱
収縮性フィルムの経時収縮によるロールの巻締まりによ
るブロッキングや巻芯部の滑り不良等を防ぐこともで
き、かつ、シュリンク包装後の滑り性、ホットスリッ
プ、耐ブロッキング性が良好なポリプロピレン系熱収縮
性フィルムを得ることができる。すなわち、透明性が優
れたポリプロピレン系熱収縮フィルムとして必要な特
性、すなわち、ヘイズが４．０％以下、収縮直後の重ね
た包装体のせん断方向の引張りに対する抵抗力が２００
０ｇ以下、４５℃のフィルム同志の静摩擦係数、動摩擦
係数が２．５以下の特性を持つポリプロピレン系熱収縮
性フィルムが得られる。Further, by blending the specific fine particles, it is possible to prevent blocking due to roll winding tightness due to shrinkage of the heat-shrinkable film, slipperiness of the winding core portion, etc., and slipperiness after shrink-wrapping. A polypropylene-based heat-shrinkable film having excellent hot slip resistance and blocking resistance can be obtained. That is, the properties required for a polypropylene-based heat-shrinkable film having excellent transparency, that is, a haze of 4.0% or less, and a resistance to pulling in a shearing direction of stacked packages immediately after shrinkage are 200.
A polypropylene heat shrinkable film having a static friction coefficient and a dynamic friction coefficient of 2.5 g or less at 0 g or less and 45 ° C. is obtained.
【００１５】更に、本発明の目的に支障をきたさない範
囲であれば、滑剤、帯電防止剤、防曇剤等の添加剤がそ
れぞれ有効な作用を具備される目的で適宜使用すること
ができる。Further, additives such as a lubricant, an antistatic agent and an antifogging agent can be appropriately used for the purpose of providing effective effects, as long as they do not hinder the object of the present invention.
【００１６】本発明を実施する方法は特に限定はされな
いが、チューブラー二軸延伸法を例にとって実施法を説
明する。結晶性プロピレン−α−オレフィン共重合体
（Ａ）とプロピレン−α−オレフィン共重合体（Ｂ）か
らなる樹脂組成物（Ｃ）に、予めフィルムの原料と同一
の結晶性プロピレン−α−オレフィン共重合体（Ａ）に
球状無機微粒子（Ｄ）及び球状ポリメチルメタクリレー
ト微粒子（Ｅ）を添加してマスターバッチ化したマスタ
ーバッチをブレンドする。球状無機微粒子（Ｄ）と球状
ポリメチルメタクリレート微粒子（Ｅ）が添加されたマ
スターバッチを原料樹脂組成物（Ｃ）にブレンドし、そ
の原料樹脂組成物を押出機により１７０〜２４０℃で溶
融混練し、２４０℃に保った環状のダイスより押出す。
形成されたチューブを内側は冷却水が循環している円筒
状冷却マンドレルの外表面を摺動させながら、外側は水
槽を通すことにより冷却して引き取り、延伸することな
く一旦急冷固化してチューブ状未延伸フィルムを得る。
得られたチューブ状未延伸フィルムを図１に示す様な延
伸装置に供給し、高度の配向可能な温度範囲で、チュー
ブ内部にガス圧を適用して膨張延伸により同時の２軸配
向を起こさせる。延伸倍率は必ずしも縦横同一でなくて
もよいが、優れた強度、収縮率等の物性を得るためには
何れの方向にも２倍以上、好ましくは３倍以上に延伸す
るのが好適である。延伸装置から取り出したフィルムは
希望によりアニーリングすることができ、このアニーリ
ングによって保存中の自然収縮率を抑制することができ
る。The method for carrying out the present invention is not particularly limited, but the method will be described by taking the tubular biaxial stretching method as an example. A resin composition (C) composed of a crystalline propylene-α-olefin copolymer (A) and a propylene-α-olefin copolymer (B) was previously added to the same crystalline propylene-α-olefin copolymer as the raw material of the film. The spherical inorganic fine particles (D) and the spherical polymethylmethacrylate fine particles (E) are added to the polymer (A) to form a masterbatch, which is blended. The masterbatch to which the spherical inorganic fine particles (D) and the spherical polymethylmethacrylate fine particles (E) are added is blended with the raw material resin composition (C), and the raw material resin composition is melt-kneaded at 170 to 240 ° C. by an extruder. Extrude from an annular die kept at 240 ° C.
The formed tube slides on the outer surface of a cylindrical cooling mandrel in which cooling water circulates, while the outer side is cooled and drawn by passing it through a water tank. An unstretched film is obtained.
The obtained tubular unstretched film is supplied to a stretching device as shown in FIG. 1, and a gas pressure is applied to the inside of the tube within a temperature range in which a high degree of orientation is possible to cause simultaneous biaxial orientation by expansion and stretching. . The stretching ratio does not necessarily have to be the same in the length and width, but in order to obtain excellent physical properties such as strength and shrinkage, it is preferable to stretch in any direction at least 2 times, preferably at least 3 times. The film taken out from the stretching device can be annealed if desired, and this annealing can suppress the natural shrinkage rate during storage.
【００１７】[0017]
【図１】[Figure 1]
【００１８】本発明の特徴一つは、熱収縮後の滑り性の
指標を見いだし、かかる知見をもとに、低温収縮性、透
明性を低下させることなく、収縮前から収縮後までのシ
ュリンク包装工程の全工程において、滑り性の良好なフ
ィルムを得た点にある。すなわち、収縮トンネルを出た
直後に重ねた包装体のせん断方向への引張りに対する抵
抗力について、収縮トンネルを出たばかりの表面温度が
５５℃の包装体を、接触面積１６５ｃｍ2 で重ね合わ
せ、１．８ｋｇの荷重を５秒間かけ、荷重を取り除いて
片方の包装体を固定してせん断方向へ引っ張り、重ねた
包装体をスライドさせるのに要する力が、箱詰め、梱包
工程等で必要な包装体の滑り性の指標として有効である
こと、その力が２０００ｇ以下であると、箱詰め等の作
業で支障がでないレベルの良好な滑り性を有しているこ
とを見いだしたものである。One of the features of the present invention is to find out an index of slipperiness after heat shrinkage, and based on such knowledge, shrink wrapping from before shrinkage to after shrinkage without lowering low temperature shrinkability and transparency. The point is that a film having good slipperiness was obtained in all the steps. That is, regarding the resistance against the pulling in the shearing direction of the stacked packages immediately after leaving the shrinking tunnel, the packages having a surface temperature of 55 ° C. just after leaving the shrinking tunnel were stacked with a contact area of 165 cm 2 . A load of 8 kg is applied for 5 seconds, the load is removed, one of the packages is fixed and pulled in the shear direction, and the force required to slide the stacked packages is the sliding of the packages required in the boxing and packing processes. It has been found that it is effective as an index of the sex, and that when the force is 2000 g or less, it has a good slipperiness that does not hinder the work such as packing.
【００１９】[0019]
【実施例】以下に本発明を実施例により具体的に説明す
るが、本発明はこれらの実施例に限定されるものではな
い。尚、本実施例中に示した諸測定は以下の方法によっ
た。 １）ヘイズ ＪＩＳ−Ｋ６７１４に準拠。日本電色工業（株）製オー
トマチックデジタルヘイズメーターＧＰ−４００で測定
した。 ２）熱収縮率 縦横ともに１００ｍｍの正方形に切り取ったフィルムを
所定の温度のグリセリン浴に１０秒間浸漬し、水冷す
る。数１により算出した。 ３）摩擦係数 ＪＩＳ−Ｋ７１２５に準拠。フィルム同志の摩擦係数を
測定した。 ４）ホットスリップ ３）と同様の方法で行い、測定時のフィルム表面温度を
４５℃に保って行った摩擦係数測定。 ５）包装体のスライド抵抗力 収縮トンネルを出た直後に重ねた包装体のせん断方向の
引張りに対する抵抗力。シュリンク包装直後のフィルム
表面温度５５℃の包装体１０３mm×１８９mm×２５mm重
量２４６ｇを図２のように接触面が１０３mm×１６０mm
になるよう重ねて、１．８ｋｇの荷重を５秒間かけて、
荷重を取り除く。荷重を取り除いた後すぐに、重なった
２つの包装体の下の方を固定して、上の方の包装体をせ
ん断方向に力をかけ、スライドさせるのに要する力を測
定する。EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. The various measurements shown in this example were carried out by the following methods. 1) Haze Based on JIS-K6714. It was measured with an automatic digital haze meter GP-400 manufactured by Nippon Denshoku Industries Co., Ltd. 2) Heat shrinkage rate A film cut into a 100 mm square in length and width is immersed in a glycerin bath at a predetermined temperature for 10 seconds and cooled with water. It was calculated by the formula 1. 3) Friction coefficient Based on JIS-K7125. The coefficient of friction between the films was measured. 4) Hot slip A friction coefficient measurement was carried out in the same manner as in 3) while keeping the film surface temperature at the time of measurement at 45 ° C. 5) Sliding resistance of the package The resistance to pulling in the shearing direction of the packages stacked immediately after leaving the shrinking tunnel. Immediately after shrink wrapping, the film surface temperature 55 ℃ 103mm × 189mm × 25mm Weight 246g, contact surface is 103mm × 160mm as shown in Fig.2.
And put 1.8kg load over 5 seconds,
Remove the load. Immediately after removing the load, the lower part of the two overlapping packages is fixed, and the upper package is subjected to a force in the shearing direction and the force required for sliding is measured.
【００２０】[0020]
【数１】 但し、Ｌ0＝収縮前のサンプルの寸法（１００ｍｍ）、
Ｌ1＝グリセリン浴浸漬後のサンプル寸法（ｍｍ）。Ｍ
Ｄ、ＴＤそれぞれを測定する。[Equation 1] However, L 0 = dimension of the sample before shrinkage (100 mm),
L 1 = Sample size (mm) after immersion in glycerin bath. M
Measure each of D and TD.
【００２１】[0021]
【図２】FIG. 2
【００２２】実施例１ ＭＦＲ（２３０℃、２．１６ｋｇ）が２．２ｇ／１０分
の結晶性プロピレン−エチレン共重合体８２重量部とビ
カット軟化点が８３℃、ＭＦＲ（２３０℃、２．１６ｋ
ｇ）が６．０ｇ／１０分のプロピレン−ブテン−１共重
合体１８重量部に平均粒子径１μの球状無機微粒子を４
８００ｐｐｍ、平均粒子径２μの球状ポリメチルメタク
リレート微粒子を１５００ｐｐｍ添加し、１７０℃〜２
４０℃で溶融混練して２３０℃に保った環状ダイスより
押し出した。形成されたチューブを、内側は冷却水が循
環している円筒状冷却マンドレルの外表面を摺動させな
がら、外側は水槽を通すことにより冷却して引き取り、
未延伸のチューブ状フィルムを得た。このチューブ状未
延伸フィルムを図１のチューブラー二軸延伸装置に導
き、加熱し、縦４倍、横４倍に延伸し、延伸フィルムを
得た。延伸フィルムの評価結果を表１に示す。延伸中の
安定性は良好で、延伸点の上下動や延伸バブルの揺動も
なく、また、ネッキングなどの不均一延伸状態も観察さ
れなかった。得られた延伸フィルムは表１に示した様な
特性値を持ち、低温収縮性に優れ、透明性も滑り性も良
好で、収縮仕上がりも良好であった。Example 1 82 parts by weight of a crystalline propylene-ethylene copolymer having an MFR (230 ° C., 2.16 kg) of 2.2 g / 10 min, a Vicat softening point of 83 ° C. and an MFR (230 ° C., 2.16 k).
g) is 6.0 g / 10 min, and 18 parts by weight of a propylene-butene-1 copolymer are mixed with 4 parts of spherical inorganic fine particles having an average particle diameter of 1 μm.
800 ppm, 1500 ppm of spherical polymethylmethacrylate fine particles having an average particle diameter of 2 μ were added, and 170 ° C. to 2
The mixture was melt-kneaded at 40 ° C and extruded from an annular die kept at 230 ° C. The formed tube slides on the outer surface of a cylindrical cooling mandrel in which cooling water circulates, while the outer side cools by passing through a water tank and is taken in,
An unstretched tubular film was obtained. This tubular unstretched film was introduced into the tubular biaxial stretching device of FIG. 1, heated, and stretched 4 times in the longitudinal direction and 4 times in the lateral direction to obtain a stretched film. The evaluation results of the stretched film are shown in Table 1. The stability during stretching was good, neither vertical movement of the stretching point nor oscillation of the stretching bubble was observed, and no non-uniform stretching state such as necking was observed. The obtained stretched film had the characteristic values shown in Table 1, was excellent in low temperature shrinkability, was excellent in transparency and slipperiness, and was also excellent in shrink finish.
【００２３】実施例２ 実施例１の結晶性ポリプロピレン−エチレン共重合体８
２重量部と、実施例１のプロピレン−ブテン−１共重合
体１８重量部に、平均粒子径１μの球状無機微粒子４８
００ｐｐｍと平均粒子径６μの球状ポリメチルメタクリ
レート微粒子１０００ｐｐｍを添加し、実施例１と同一
の方法で延伸フィルムを得た。評価結果を表１に示す。
実施例１と同様に延伸中の安定性は良好で、延伸点の上
下動や延伸バブルの揺動もなく、また、ネッキングなど
の不均一延伸状態も観察されなかった。得られた延伸フ
ィルムは表１に示したような特性値を持ち、透明性、低
温収縮性に優れたものであり、収縮仕上がりが良く、良
好な滑り性を有するものであった。Example 2 Crystalline polypropylene-ethylene copolymer 8 of Example 1
2 parts by weight and 18 parts by weight of the propylene-butene-1 copolymer of Example 1 were added to spherical inorganic fine particles 48 having an average particle size of 1 μm.
00 ppm and 1000 ppm of spherical polymethylmethacrylate fine particles having an average particle diameter of 6 μ were added, and a stretched film was obtained in the same manner as in Example 1. Table 1 shows the evaluation results.
As in Example 1, the stability during stretching was good, neither vertical movement of the stretching point nor oscillation of the stretching bubble was observed, and non-uniform stretching state such as necking was not observed. The obtained stretched film had the characteristic values shown in Table 1, was excellent in transparency and low temperature shrinkability, had a good shrink finish, and had good slipperiness.
【００２４】実施例３ 実施例１の結晶性ポリプロピレン−エチレン共重合体７
５重量部と、実施例１のプロピレン−ブテン−１共重合
体２５重量部に、平均粒子径１μの球状無機微粒子３５
００ｐｐｍと平均粒子径２μの球状ポリメチルメタクリ
レート微粒子１５００ｐｐｍを添加し、実施例１と同一
の方法で延伸フィルムを得た。評価結果を表１に示す。
実施例１と同様に延伸中の安定性は良好で、延伸点の上
下動や延伸バブルの揺動もなく、また、ネッキングなど
の不均一延伸状態も観察されなかった。得られた延伸フ
ィルムは表１に示したような特性値を持ち、透明性、低
温収縮性に優れたものであり、収縮仕上がりが良く、良
好な滑り性を有するものであった。Example 3 Crystalline polypropylene-ethylene copolymer 7 of Example 1
5 parts by weight and 25 parts by weight of the propylene-butene-1 copolymer of Example 1 were mixed with spherical inorganic fine particles 35 having an average particle diameter of 1 μm.
A stretched film was obtained in the same manner as in Example 1 by adding 00 ppm and 1500 ppm of spherical polymethylmethacrylate fine particles having an average particle diameter of 2 μm. Table 1 shows the evaluation results.
As in Example 1, the stability during stretching was good, neither vertical movement of the stretching point nor oscillation of the stretching bubble was observed, and non-uniform stretching state such as necking was not observed. The obtained stretched film had the characteristic values shown in Table 1, was excellent in transparency and low temperature shrinkability, had a good shrink finish, and had good slipperiness.
【００２５】[0025]
【表１】 [Table 1]
【００２６】比較例１ 実施例１の結晶性ポリプロピレン−エチレン共重合体８
２重量部と、実施例１のプロピレン−ブテン−１共重合
体１８重量部に、平均粒子径１μの球状無機微粒子５０
００ｐｐｍと平均粒子径２μの球状ポリメチルメタクリ
レート微粒子３５００ｐｐｍを添加し、実施例１と同一
の方法で延伸フィルムを得た。評価結果を表２に示す。
実施例１と同様に延伸中の安定性は良好で、延伸点の上
下動や延伸バブルの揺動もなく、また、ネッキングなど
の不均一延伸状態も観察されなかった。得られた延伸フ
ィルムは表２に示したような特性値を持ち、滑り性、低
温収縮性に優れてはいるが、透明性が悪かった。Comparative Example 1 Crystalline polypropylene-ethylene copolymer 8 of Example 1
2 parts by weight and 18 parts by weight of the propylene-butene-1 copolymer of Example 1 and 50 parts by weight of spherical inorganic fine particles having an average particle size of 1 μm.
00 ppm and 3500 ppm of spherical polymethylmethacrylate fine particles having an average particle diameter of 2 μ were added, and a stretched film was obtained by the same method as in Example 1. Table 2 shows the evaluation results.
As in Example 1, the stability during stretching was good, neither vertical movement of the stretching point nor oscillation of the stretching bubble was observed, and non-uniform stretching state such as necking was not observed. The obtained stretched film had the characteristic values shown in Table 2 and was excellent in slipperiness and low temperature shrinkability, but was poor in transparency.
【００２７】比較例２ 実施例１の結晶性ポリプロピレン−エチレン共重合体８
２重量部と、実施例１のプロピレン−ブテン−１共重合
体１８重量部に、平均粒子径１μの球状無機微粒子２５
００ｐｐｍと平均粒子径２μの球状ポリメチルメタクリ
レート微粒子１０００ｐｐｍを添加し、実施例１と同一
の方法で延伸フィルムを得た。評価結果を表２に示す。
実施例１と同様に延伸中の安定性は良好で、延伸点の上
下動や延伸バブルの揺動もなく、また、ネッキングなど
の不均一延伸状態も観察されなかった。得られた延伸フ
ィルムは表２に示したような特性値を持ち、低温収縮
性、透明性に優れてはいるが、滑り性が悪かった。Comparative Example 2 Crystalline polypropylene-ethylene copolymer 8 of Example 1
2 parts by weight and 18 parts by weight of the propylene-butene-1 copolymer of Example 1 were added to spherical inorganic fine particles 25 having an average particle diameter of 1 μm.
00 ppm and 1000 ppm of spherical polymethylmethacrylate fine particles having an average particle diameter of 2 μ were added, and a stretched film was obtained by the same method as in Example 1. Table 2 shows the evaluation results.
As in Example 1, the stability during stretching was good, neither vertical movement of the stretching point nor oscillation of the stretching bubble was observed, and non-uniform stretching state such as necking was not observed. The obtained stretched film had the characteristic values shown in Table 2 and was excellent in low temperature shrinkability and transparency, but was poor in slipperiness.
【００２８】比較例３ 実施例１の結晶性ポリプロピレン−エチレン共重合体８
２重量部と、実施例１のプロピレン−ブテン−１共重合
体１８重量部に、平均粒子径１μの球状無機微粒子３５
００ｐｐｍと平均粒子径２μの球状ポリメチルメタクリ
レート微粒子３０００ｐｐｍを添加し、実施例１と同一
の方法で延伸フィルムを得た。評価結果を表２に示す。
延伸中の安定性は良好で、延伸点の上下動や延伸バブル
の揺動もなく、また、ネッキングなどの不均一延伸状態
も観察されなかった。得られた延伸フィルムは表２に示
した様な特性値を持ち、低温収縮性があり、滑り性は良
好であったが、透明性が悪かった。Comparative Example 3 Crystalline polypropylene-ethylene copolymer 8 of Example 1
2 parts by weight and 18 parts by weight of the propylene-butene-1 copolymer of Example 1 were added to spherical inorganic fine particles 35 having an average particle diameter of 1 μm.
00 ppm and 3000 ppm of spherical polymethylmethacrylate fine particles having an average particle diameter of 2 μ were added, and a stretched film was obtained by the same method as in Example 1. Table 2 shows the evaluation results.
The stability during stretching was good, neither vertical movement of the stretching point nor oscillation of the stretching bubble was observed, and no non-uniform stretching state such as necking was observed. The obtained stretched film had the characteristic values shown in Table 2, had low-temperature shrinkability, and had good slipperiness, but had poor transparency.
【００２９】[0029]
【表２】 [Table 2]
【００３０】比較例４ 実施例１の結晶性ポリプロピレン−エチレン共重合体８
２重量部と、実施例１のプロピレン−ブテン−１共重合
体１８重量部に、平均粒子径１μの球状無機微粒子４８
００ｐｐｍを添加し、実施例１と同一の方法で延伸フィ
ルムを得た。評価結果を表３に示す。延伸中の安定性は
良好で、延伸点の上下動や延伸バブルの揺動もなく、ま
た、ネッキングなどの不均一延伸状態も観察されなかっ
た。得られた延伸フィルムは表３に示した様な特性値を
持ち、低温収縮性があり、透明性は良好であったが、滑
り性が悪かった。Comparative Example 4 Crystalline polypropylene-ethylene copolymer 8 of Example 1
2 parts by weight and 18 parts by weight of the propylene-butene-1 copolymer of Example 1 were added to spherical inorganic fine particles 48 having an average particle size of 1 μm.
00 ppm was added, and a stretched film was obtained in the same manner as in Example 1. The evaluation results are shown in Table 3. The stability during stretching was good, neither vertical movement of the stretching point nor oscillation of the stretching bubble was observed, and no non-uniform stretching state such as necking was observed. The obtained stretched film had the characteristic values shown in Table 3, had low-temperature shrinkability, and had good transparency, but had poor slipperiness.
【００３１】比較例５ 実施例１の結晶性ポリプロピレン−エチレン共重合体９
５重量部と、実施例１のプロピレン−ブテン−１共重合
体５重量部に、平均粒子径１μの球状無機微粒子４８０
０ｐｐｍと平均粒子径２μの球状ポリメチルメタクリレ
ート微粒子１５００ｐｐｍを添加し、実施例１と同一の
方法で延伸フィルムを得た。評価結果を表３に示す。延
伸中の安定性は良好で、延伸点の上下動や延伸バブルの
揺動もなく、また、ネッキングなどの不均一延伸状態も
観察されなかった。得られた延伸フィルムは表３に示し
た様な特性値を持ち、低温収縮性がなく、透明性がやや
不良であったが、滑り性は良好であった。Comparative Example 5 Crystalline polypropylene-ethylene copolymer 9 of Example 1
5 parts by weight and 5 parts by weight of the propylene-butene-1 copolymer of Example 1 were added to spherical inorganic fine particles 480 having an average particle diameter of 1 μm.
A stretched film was obtained in the same manner as in Example 1 by adding 0 ppm and 1500 ppm of spherical polymethylmethacrylate fine particles having an average particle diameter of 2 μm. The evaluation results are shown in Table 3. The stability during stretching was good, neither vertical movement of the stretching point nor oscillation of the stretching bubble was observed, and no non-uniform stretching state such as necking was observed. The obtained stretched film had the characteristic values shown in Table 3, had no low-temperature shrinkage, and had a slightly poor transparency, but had good slipperiness.
【００３２】比較例６ 実施例１の結晶性ポリプロピレン−エチレン共重合体６
５重量部と、実施例１のプロピレン−ブテン−１共重合
体３５重量部に、平均粒子径１μの球状無機微粒子４８
００ｐｐｍと平均粒子径２μの球状ポリメチルメタクリ
レート微粒子１５００ｐｐｍを添加し、実施例１と同一
の方法で延伸フィルムを得た。評価結果を表３に示す。
延伸中の安定性は良好で、延伸点の上下動や延伸バブル
の揺動もなく、また、ネッキングなどの不均一延伸状態
も観察されなかった。得られた延伸フィルムは表３に示
した様な特性値を持ち、低温収縮性、透明性が良好であ
ったが、滑り性が非常に悪かった。Comparative Example 6 Crystalline polypropylene-ethylene copolymer 6 of Example 1
5 parts by weight and 35 parts by weight of the propylene-butene-1 copolymer of Example 1 are added to spherical inorganic fine particles 48 having an average particle diameter of 1 μm.
A stretched film was obtained in the same manner as in Example 1 by adding 00 ppm and 1500 ppm of spherical polymethylmethacrylate fine particles having an average particle diameter of 2 μm. The evaluation results are shown in Table 3.
The stability during stretching was good, neither vertical movement of the stretching point nor oscillation of the stretching bubble was observed, and no non-uniform stretching state such as necking was observed. The obtained stretched film had the characteristic values shown in Table 3 and had good low-temperature shrinkability and transparency, but very poor slipperiness.
【００３３】[0033]
【表３】 [Table 3]
【００３４】[0034]
【発明の効果】本発明の特定の条件を満足する原料で構
成し、特定の２つ異なる粒子径を持つ球状の微粒子を組
み合わせて使用することで、従来のポリプロピレン系熱
収縮性の滑り性、耐ブロッキング性を透明性が低下する
ことなく改善することが可能となり、良好な低温収縮
性、透明性、滑り性が収縮前後にわたって維持されるポ
リプロピレン系熱収縮性フィルムが得られた。EFFECT OF THE INVENTION By using a raw material which satisfies the specific conditions of the present invention and combining spherical fine particles having two specific two different particle sizes, the conventional polypropylene-based heat-shrinkable slipperiness, Blocking resistance can be improved without lowering transparency, and a polypropylene-based heat-shrinkable film having good low-temperature shrinkability, transparency, and slidability maintained before and after shrinkage was obtained.
【図１】実施例、比較例で用いたチューブラー二軸延伸
装置の概略断面図である。FIG. 1 is a schematic sectional view of a tubular biaxial stretching device used in Examples and Comparative Examples.
【図２】実施例中の評価方法の包装体のスライド抵抗力
の説明略図である。FIG. 2 is a schematic diagram for explaining a slide resistance force of a package according to an evaluation method in an example.
【符号の説明】 １ 未延伸フィルム ２ 低速ニップロール ３ 高速ニップロール ４ 予熱器 ５ 主熱器 ６ 冷却エアリング ７ 折り畳みロール群[Explanation of symbols] 1 unstretched film 2 low speed nip roll 3 high speed nip roll 4 preheater 5 main heater 6 cooling air ring 7 folding roll group
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０８Ｋ 7/18 ＫＦＴ Ｃ０８Ｋ 7/18 ＫＦＴ // Ｂ２９Ｋ 23:00 105:02 Ｂ２９Ｌ 7:00 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display location C08K 7/18 KFT C08K 7/18 KFT // B29K 23:00 105: 02 B29L 7:00
Claims (3)
重合の割合が９重量％以下の結晶性プロピレン−α−オ
レフィン共重合体（Ａ）７０〜９０重量部とプロピレン
に対してα−オレフィンの共重合の割合が１０〜４５重
量％のプロピレン−α−オレフィン共重合体（Ｂ）３０
〜１０重量部からなる樹脂組成物（Ｃ）１００重量部に
対して、平均粒子径が０．８〜１．５μの球状無機微粒
子（Ｄ）２５００〜７０００ｐｐｍと平均粒子径が２〜
６μの球状ポリメチルメタクリレート（Ｅ）５００〜２
５００ｐｐｍを、トータルの微粒子添加量が４０００〜
８０００ｐｐｍとなるように配合した、低温収縮性に優
れ、かつ、透明性、滑り性、耐ブロッキング性にも優れ
たポリプロピレン系熱収縮性フィルム。1. A crystalline propylene-α-olefin copolymer (A) 70 to 90 parts by weight having a copolymerization ratio of α-olefin to propylene of 9% by weight or less and an α-olefin to propylene. Propylene-α-olefin copolymer (B) 30 having a copolymerization ratio of 10 to 45% by weight
To 100 parts by weight of the resin composition (C) consisting of 10 to 10 parts by weight, the spherical inorganic fine particles (D) having an average particle diameter of 0.8 to 1.5 μ are from 2500 to 7000 ppm and the average particle diameter is from 2 to 2.
6μ spherical polymethylmethacrylate (E) 500-2
500ppm, the total amount of fine particles added is 4000-
A polypropylene-based heat-shrinkable film, which is blended so as to have a concentration of 8000 ppm, is excellent in low-temperature shrinkability, and is also excellent in transparency, slipperiness, and blocking resistance.
合体（Ａ）が、α−オレフィンとしてエチレン、ブテン
−１から選ばれた共重合体であり、２元共重合体または
３元共重合体、あるいはそれらの混合物である請求項１
記載のポリプロピレン系熱収縮性フィルム。2. The crystalline propylene-α-olefin copolymer (A) is a copolymer selected from ethylene and butene-1 as the α-olefin, and is a binary copolymer or a ternary copolymer. Or a mixture thereof.
The polypropylene-based heat-shrinkable film described.
（Ｂ）が、ビカット軟化点が８０〜１１５℃、ＭＦＲ
（２３０℃、２．１６ｋｇ）が２．０〜９．０ｇ／１０
分である請求項１あるいは請求項２に記載のポリプロピ
レン系熱収縮性フィルム。3. The propylene-α-olefin copolymer (B) has a Vicat softening point of 80 to 115 ° C. and MFR.
(230 ° C, 2.16kg) is 2.0 to 9.0g / 10
The polypropylene-based heat-shrinkable film according to claim 1 or 2, which is a minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9592295A JP3452421B2 (en) | 1995-03-30 | 1995-03-30 | Polypropylene heat shrinkable film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9592295A JP3452421B2 (en) | 1995-03-30 | 1995-03-30 | Polypropylene heat shrinkable film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08269265A true JPH08269265A (en) | 1996-10-15 |
| JP3452421B2 JP3452421B2 (en) | 2003-09-29 |
Family
ID=14150779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9592295A Expired - Fee Related JP3452421B2 (en) | 1995-03-30 | 1995-03-30 | Polypropylene heat shrinkable film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3452421B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010009459A (en) * | 1999-07-09 | 2001-02-05 | 유현식 | polypropylene compounds for films |
| KR20010112675A (en) * | 2000-06-10 | 2001-12-21 | 유현식 | Polypropylene resin composition with good slip property and adhesive property to polypropylene film for extrusion coating |
-
1995
- 1995-03-30 JP JP9592295A patent/JP3452421B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010009459A (en) * | 1999-07-09 | 2001-02-05 | 유현식 | polypropylene compounds for films |
| KR20010112675A (en) * | 2000-06-10 | 2001-12-21 | 유현식 | Polypropylene resin composition with good slip property and adhesive property to polypropylene film for extrusion coating |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3452421B2 (en) | 2003-09-29 |
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