Patent ID: 6485817
Filing Date: 2002-11-26
Classification: B32B,C08L,Y10S,Y10T

Abstract:
A transparent composite, oriented polyolefin film comprising a first layer and at least a second skin layer, said first layer being a heteropolymer consisting essentially of an ethylene/propylene copolymer including less than 10%, by weight, ethylene, said at least second skin layer being a high tensile modulus polypropylene of a thickness such that its oxygen transmission rate (OTR) is higher than that of the first layer and the total composite structure having an oxygen transmission rate (OTR) of at least 200 cc/100 sq. in./day/atmosphere, a moisture vapor transmission rate (MVTR) of at least 0.5 gram/sq. in./day, and a tensile modulus of at least 185,000 psi in both the machine-direction and the cross-machine direction.