Patent ID: 6022612
Filing Date: 2000-02-08
Classification: B32B,C08F,C08L,Y10T

Abstract:
A coextruded biaxially oriented polyolefin packaging film comprising a core layer and a cold seal receptive skin layer, said skin layer being formed on one surface of said core layer,said skin layer comprising:a blend of between about 30% and 60% by weight thermoplastic rubber and between about 40% and about 70% by weight polyolefin polymer, said blend being formed into a film having a thickness of between about 1 and 20 gauge, said thermoplastic rubber is selected from the group consisting of styrene-isoprene-styrene copolymers and styrene-butadiene-styrene copolymers, said polyolefin polymer comprises at least one member selected from the group consisting of polyethylenes having densities in the range of from 0.91 to 0.965 gm/cm.sup.3, isotactic homopolymer polypropylene, syndiotactic homopolymer polypropylene, ethylene-propylene random copolymers, ethylene-propylene block copolymers, ethylene-butylene copolymers made by metallocene catalysis, ethylene-hexene copolymers made by metallocene catalysis, ethylene-octene copolymers made by metallocene catalysis, blends of said ethylene-butylene copolymers, said ethylene-hexane copolymers and said ethylene-octene copolymers with syndiotactic homopolymer polypropylene, blends of syndiotactic homopolymer polypropylene with ethylene-propylene random copolymer, and mixtures thereof, andsaid core layer comprising at least one member selected from the group consisting of isotactic homopolymer polypropylene, ethylene-propylene random copolymers, ethylene-propylene block copolymers, polyethylene having a density in the range of 0.94 to 0.965 gm/cm.sup.3 and mixtures thereof formed into a film.