Patent ID: 7951503

Claim:
A fuel cell comprising an electrolyte film which is a cured film obtained by polymerizing and curing: (1) 100 parts by mass of a monomer containing per molecule at least one ethylenically unsaturated group and at least one ion conductive group or at least one precursor group capable of forming an ion conductive group through chemical reaction; and (2) 10 to 400 parts by mass of a fluoropolyether urethane acrylate oligomer containing per molecule at least two reactive groups copolymerizable with the at least one ethylenically unsaturated group in component (1) and having a number average molecular weight of at least 400, with the proviso that when component (1) contains the precursor group, the precursor group is converted into an ion conductive group; wherein 10 to 400 parts by mass of a fluororesin is uniformly dispersed and incorporated in the cured film.