POLYPROPYLENE FILM HAVING EXCELLENT HEAT RESISTANCE

摘要

PURPOSE: A polypropylene film is provided, which has excellent heat resistance without additional treating of special stabilizer of heat resistance and has no devaluation of product by deterioration of appearance from sterilizing by high temperature. CONSTITUTION: A polypropylene film consists of surface layer of 15-20% in thickness and an internal layer of 80-85% in thickness. The internal layer is comprising 5-15wt.% of powdery calcium carbonates against 100wt.% of copolymer resins of a polypropylene of which isotactic index is up to 96%.