Patent ID: 6531236
Filing Date: 2003-03-11
Classification: C08L,H01M,Y02E,Y02P

Abstract:
A polymer electrolyte fuel cell stack comprising a plurality of unit cells, each of said unit cells comprising a polymer electrolyte membrane, a pair of electrodes that are arranged across said polymer electrolyte membrane and respectively have a catalytic reaction layer, a separator having means for feeding a supply of fuel gas containing hydrogen gas to one of said electrodes,further comprising sealing portions arranged in such a manner that a periphery of each said polymer electrolyte membrane is interposed between a pair of said sealing portions, wherein said sealing portions have a three-layered structure, where a heat-resistant hard resin layer is interposed between a pair of elastic resin layers, wherein the heat-resistant hard resin layer comprises a polyethylene terephthalate resin and the elastic resin layers comprise a polymer of isobutylene oligomers expressed by Formula (2): wherein X and Y are independently polymerizable functional groups.