POLYPROPYLENE-BASED FILM AND MULTILAYER FILM THEREOF

摘要

PROBLEM TO BE SOLVED: To obtain a polypropylene-based film slightly developing such uneven patterns on the film surface as citron-like skin caused by retorting process, and suitable as a food packaging material. SOLUTION: This polypropylene-based film consists mainly of (1) 85 to 98 wt.% of a propylene-α-olefin block copolymer comprising (a) 95 to 70 wt.% of polypropylene block and (b) 5-30 wt.% of copolymer elastomer block of propylene and anα-olefin wherein the number of carbon atoms is 2 to 12 (excluding 3), and (2) 15 to 2 wt.% of an ethylene-based copolymer elastomer as a copolymer of 90-70 wt.% of ethylene and 10 to 30 wt.% of a 3-12Cα-olefin.