Patent ID: 6730379
Filing Date: 2004-05-04
Classification: B29C,B29L,B32B,Y10T

Abstract:
A shoe having an upper and a sole structure, comprising a gas-filled cushioning device forming part of said sole structure, the gas-filled cushioning device comprising:a multi-layer film formed into a gas-filled membrane having an interior compartment containing at least one capture gas constituent, said multi-layer film including an outer layer comprising a flexible resilient elastomeric thermoplastic material, an inner layer comprising a second flexible resilient elastomeric thermoplastic material, and a barrier layer comprising a combination of at least one aliphatic thermoplastic urethane and at least one copolymer of ethylene and vinyl alcohol, wherein the barrier layer includes up to about 50 wt. % of aliphatic thermoplastic urethane, said multi-layer film being capable of selectively resisting an outward diffusion of said capture gas constituent and permitting an inward diffusion pumping of at lest one mobile gas constituent, said barrier layer being interposed between and in direct contiguous contact with at least a segment of said outer and inner layers.