ELECTROLYTE FILM, PROCESS FOR PRODUCING THE SAME, AND SOLID POLYMER TYPE FUEL CELL

摘要

An electrolyte film characterized by comprising a porous object formed from a melt-moldable fluororesin and having interconnected pores and an ion-exchange resin with which the interconnected pores are filled. The porous object, for example, is made of an ethylene/tetrafluoroethylene copolymer, tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer, tetrafluoroethylene/hexafluoropropylene copolymer, or tetrafluoroethylene/[CF2=CF-(OCF2CFY)a-Oc-(CF2)b-SO3H] copolymer (wherein Y is fluorine or trifluoromethyl; a is an integer of 0 to 3; b is an integer of 0 to 12; and c is 0 or 1, provided that when b is 0, then c is 0). The electrolyte film reinforced with such porous object has high mechanical strength even when thin, and has excellent dimensional stability when impregnated with water. A solid polymer type fuel cell employing a film electrode assembly including the electrolyte film has a high output and excellent durability.