Patent ID: 7228877
Filing Date: 2007-06-12
Classification: B32B,C08L,F16L,H04J,H04L,H04Q,Y10T

Abstract:
1. A flexible fuel hose having improved fuel vapor barrier properties, said hose comprising a plurality of tubular structures, comprising: a first tubular structure comprising a fluoropolymer barrier layer formed from a blend of about 5 to 95 weight percent of a first fluoropolymer having a fluorine content of about 68 to 75%, said first fluoropolymer comprising a copolymer or terpolymer formed of two or more monomers selected from the group consisting of hexafluoropropylene, vinylidene fluoride and tetrafluoroethylene, and about 95 to 5 weight percent of a second fluoropolymer having a fluorine content of about 73 to 78%, said second fluoropolymer comprising a terpolymer of hexafluoropropylene, vinylidene fluoride and tetrafluoroethylene, wherein said first fluoropolymer exhibits elastomeric characteristics and said second fluoropolymer exhibits thermoplastic characteristics; a second tubular structure formed around said first inner tubular structure, said second tubular structure comprising a fluorothermoplastic terpolymer of hexafluoropropylene, tetrafluoroethylene, and vinylidene fluoride; and a protective cover, wherein one of said first tubular structure and said second tubular structure forms an inner barrier layer and the other of said first tubular structure and said second tubular structure forms a second layer around said inner barrier layer.