首页>
外国专利>
Uniaxially shrinkable biaxially oriented polypropylene film and method for use as tobacco pack overwrap
Uniaxially shrinkable biaxially oriented polypropylene film and method for use as tobacco pack overwrap
展开▼
机译:单轴可收缩双轴取向聚丙烯薄膜及其用作烟草包装外包装的方法
展开▼
页面导航
摘要
著录项
相似文献
摘要
A uniaxially heat-shrinkable, biaxially oriented, multilayer film for use as a tobacco pack or carton overwrap having a polypropylene-containing core layer comprising at least 70 wt.% of said multilayer film and at least one polyolefin-containing skin layer adjacent said core layer is prepared by biaxially orienting a coextrudate and thereafter orienting said coextrudate by stretching 10 to 40 % in the machine direction. The core layer contains isotactic polypropylene and a modifier which reduces the crystallinity of the polypropylene-containing core. Such modifiers can be selected from the group consisting of atactic polypropylene, syndiotactic polypropylene, ethylene-propylene copolymer, propylene-butene-1 copolymer, ethylene-propylene-butene terpolymer, and linear low density polyethylene. The skin layer can be selected from the group consisting of polypropylene, ethylene-propylene copolymer, polyethylene, and ethylene-propylene-butene-1 terpolymer and contains silicone oil.
展开▼