Patent ID: 7975404
Filing Date: 2011-07-12
Classification: B29C,B29K,B32B,Y10T

Abstract:
1. A resilient footwear stiffener for retaining a shape of a heel or toe portion of footwear, the stiffener comprising a polyethylene terephthalate glycol copolyester layer and at least one low melting point plastic adhesive resin layer coextruded on at least one side of the polyethylene terephthalate glycol copolyester layer so that said low melting point plastic adhesive resin is not fully dissolved in the polyethylene terephthalate glycol copolyester, wherein said low melting point plastic adhesive resin has a melting point below 85° C. and wherein said low melting point plastic adhesive resin layer or layers is no more than 20% of the total thickness of the coextruded sheet.