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 _-OLEFINS,OR A PROPYLENE POLYMER COMPOSITION CONTAINING AT LEAST 0.8% BY WEIGHT OF ONE OR MORE COMONOMERS SELECTED FROM ETHYLENE AND C4-C10α-OLEFINS, AND HAVING THE FOLLOWING FEATURES: 1) A MELTING TEMPERATURE OF 155 °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°C TO 95°C (BY TREF) TO THE SAID XYLENE SOLUBLE FRACTION HIGHER THAN 8.