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    • 4. 发明授权
    • Film having gas permeability
    • 具有透气性的薄膜
    • US06348271B1
    • 2002-02-19
    • US09445194
    • 1999-12-02
    • Shinji NakataYouichi KugimiyaChikashi OkayamaTakanori NakashimaYuji Ando
    • Shinji NakataYouichi KugimiyaChikashi OkayamaTakanori NakashimaYuji Ando
    • B32B2700
    • C08J5/18B29C55/04B29K2023/12B29K2995/0065C08J2323/10C08J2323/16C08L23/10C08L23/12C08L23/142C08L23/16Y10T428/31855Y10T428/31909C08L2666/04
    • An object of the present invention is to provide a drawn polypropylene film as a wrapping material that has transparency and mechanical properties sufficient as a wrapping material yet having the needed gas permeability for maintaining the freshness of the enclosed goods and additionally enables control of permeability of gases to a certain proportion if needed even if secondary steps such as perforation processing, etc., are eliminated. The present invention provides a polypropylene film drawn at least monoaxially which comprises a propylene resin composition comprising a propylene polymer component and a copolymer component containing ethylene and propylene, wherein a content of the copolymer component is 7 to 70% by weight based on the weight of the composition, and the film has a thickness [D1] of 10 to 100&mgr;m and has the following characteristics (1) to (3): (1) [TH2O] (a permeability of water vapor)=9 to 50 (unit: g/m2·24 Hr, in accordance with JIS Z-0208), (2) [TO2] (a permeability of oxygen gas)=600-12,500 (unit: nmol (STP)/m2·s·100 kPa, in accordance with JIS K-7126A), (3) [Tethylene] (a permeability of ethylene gas)=600-22,500 (unit: nmol (STP)/m2·s·100 kPa, in accordance with JIS K-7126A.)
    • 本发明的目的是提供一种作为包装材料的拉伸聚丙烯薄膜,其具有足够的透明度和机械性能作为包装材料,但具有所需的气体渗透性,以保持封闭的商品的新鲜度,并且还可以控制气体的渗透性 如果需要,即使消除诸如穿孔处理等的二次步骤,也能够达到一定比例。 本发明提供至少单轴拉伸的聚丙烯薄膜,其包含丙烯聚合物组分和含有乙烯和丙烯的共聚物组分的丙烯树脂组合物,其中共聚物组分的含量为7至70重量%,基于 该组合物和膜的厚度[D1]为10〜100μm,具有以下特征(1)〜(3):(1)[TH 2 O](水蒸气的渗透性)= 9〜50(单位:g / m2·Hr,根据JIS Z-0208),(2)[TO2](氧气的渗透性)= 600-12,500(单位:nmol(STP)/ m 2·s.100kPa),根据 JIS K-7126A),(3)[Tethylene](乙烯气体的渗透性)= 600-22,500(单位:nmol(STP)/ m2.s.100kPa,按照JIS K-7126A)