Patent ID: 6723399
Filing Date: 2004-04-20
Classification: A61J,B32B,Y10T

Abstract:
A coextruded multilayer thermoplastic film structure comprising:a first layer (A) comprising a mixture of a major amount of a homopolymer or copolymer of polypropylene and a minor amount of a block polymer of a vinyl aromatic monomer and a conjugated diene, a partially hydrogenated derivative thereof, or a selectively hydrogenated derivative thereof to which has been grafted a unsaturated carboxylic reagent; a second layer (B) melt bonded to said first layer (A), said second layer (B) comprising a major amount of a block polymer of a vinyl aromatic monomer and a conjugated diene, a partially hydrogenated derivative thereof, or a selectively hydrogenated derivative thereof to which has been grafted an unsaturated carboxylic reagent; and a third layer (C) melt bonded to said second layer (B), said third layer (C) comprising a major amount of a homopolymer or copolymer of polypropylene.