BIORIENTED POLYPROPYLENE FILMS

摘要

Bioriented polypropylene films (BOPP) wherein at least one layer comprises a propylene polymer containing at least 0.8% by weight of ethylene and optionally one or more C4-C10 alpha -olefins, or a propylene polymer composition containing at least 0.8% by weight of one or more comonomers selected from ethylene and more C4-C10 alpha -olefins, and having the following features: 1) a melting temperature of 155 DEG C or higher; 2) a content of fraction soluble in xylene at room temperature lower than 3% by weight and a value of the ratio of the polymer fraction collected at the temperature range from 25 DEG C to 95 DEG C (by TREF) to the said xylene soluble fraction higher than 8.