Patent ID: 7557178
Filing Date: 2009-07-07
Classification: C08F,C08J,H01M,Y02E,Y02P

Abstract:
1. A process for producing a membrane-electrode assembly for polymer electrolyte fuel cells which comprises a membrane-form polymer electrolyte, a cathode disposed on one side of the electrolyte and comprising a catalyst and a perfluoropolymer having alicyclic structures in its main chain and further having sulfonic acid groups, and an anode disposed on the other side of the electrolyte, wherein the perfluoropolymer having sulfonic acid groups is produced via a step of obtaining a perfluoropolymer having alicyclic structures in its main chain and further having —SO 2 F groups by radical polymerization and then contacting the perfluoropolymer with fluorine gas, and a step of converting the —SO 2 F groups to the sulfonic acid groups.