Patent ID: 8183304

Claim:
A process for producing a solid polyelectrolyte film by graft-polymerizing a polymerizable monomer with a fluororesin film which has been irradiated with a radiation, said process comprising the steps of: (a) irradiating a fluororesin film with a radiation; (b) graft-polymerizing at least one polymerizable monomer having an alkoxysilyl group which is selected from the group consisting of trimethoxysilylstyrene, triethoxysilylstyrene, vinylbenzyltrimethoxysilane, vinylbenzyltriethoxysilane, vinylphenethyltrimethoxysilane and vinylphenethyltriethoxysilane, and at least one monomer selected from the group consisting of styrene, α-methylstyrene and trifluorostyrene, with the fluororesin film which has been irradiated with the radiation; (c) hydrolyzing the alkoxysilyl group to conduct a dehydrating condensation; and (d) introducing a sulfo group into a graft chain through a sulfonation reaction.