Polypropylene block copolymers and containers made therefrom

摘要

A propylene block copolymer comprising (A) 60-90 weight %, based on the total amount of the block copolymer, of a first block of a propylene polymer, optionally containing a small amount of copolymerised ethylene, (B) 40-10 weight %, based on the total amount of the block copolymer, of a second block of an ethylene-propylene copolymer containing 1-10 weight % of ethylene, and the total ethylene content of the block copolymer being within the range of 0.1-2.5%. The weight process for the manufacturing of the propylene block copolymer and use of it for the manufacture of bioriented bottles.