Films using blends of polypropylene and polyisobutylene

摘要

Polymeric film which is a blend of about 10% to 65% by weight polyisobutylene and conversely about 90% to 35% by weight of polypropylene copolymer. The polypropylene is preferably a copolymer having about 70 to about 98 mole percent propylene moieties and conversely about 30 to about 2 mole percent ethylene moieties. Preferred films have a blend composition of 20% to 40% by weight polyisobutylene and 80% to 60% by weight polypropylene copolymer. It is also preferred that the polypropylene copolymer is 92 to 98 mole percent propylene moieties and conversely 2 to 8 mole percent ethylene moieties.