Patent ID: 7993793
Filing Date: 2011-08-09
Classification: C08J,H01M,Y02E,Y02P

Abstract:
1. A process for producing a polymer electrolyte membrane for fuel cells comprising: providing a polymer base film; forming on the polymer base film a layer which contains a photopolymerization initiator and a fixing agent; having formed the layer on the base film, irradiating the polymer base film with ultraviolet rays while the surface of the layer is placed in contact with a liquid mixture of a vinyl monomer capable of retaining sulfonic acid groups and a solvent so that the vinyl monomer is graft polymerized into the polymer base film in a liquid-phase system; irradiating the grafted polymer base film with electron beams or gamma rays to cause multiplex crosslinkinq between grafted molecular chains themselves, between molecular chains themselves in the base film, and between grafted molecular chains and molecular chains in the base film; and introducing sulfonic acid groups into aromatic rings in the grafted molecular chains.