| 摘要 |
PURPOSE: To manufacture a film, which is not disturbing optical properties such as transparency, gloss and the like as remarkable features of an oriented propylene film, superior interlaminar bonding properties, and an excellent low- temperature heat sealability. CONSTITUTION: An oriented multi-layer propylene film is composed of an oriented crystalline propylene layer and a straight-chain ethylene/α-olefin copolymer layer formed at least on one face of the oriented crystalline propylene layer by copolymerizing ethylene and 3-12Cα-olefin and having the density of 0.860-0.930g/cm<3> and Mw/Mn of 3 or less and the ratio of the average branching number of 1.3 or less in a low molecular-weight area of 30wt.% to the average branching number in a high-molecular weight area of 30wt.%. |
