Patent ID: 7846614

Claim:
A process for producing an electrode for a solid polymer electrolyte fuel cell comprising forming the electrode by fixing a mixture of solutions or dispersions of proton-conductive polymers, electrocatalyst particles and a catalyst-supporting substance therefor, which comprises (a) a step of mixing a solution or dispersion in water or a solvent of a first proton-conductive polymer which has an MI value higher than that of a second proton-conductive polymer and a precursor of which has an MI (melt index measured at 270° C., according to ASTM standard D1238) value of 210 or more, the electrocatalyst particles and the catalyst-supporting substance therefor, to produce a catalyst at least partly covered with the first proton-conductive polymer, and (b) a step of mixing the catalyst obtained in the step (a) with a dispersion in water or a solvent of the second proton-conductive polymer a precursor of which has an MI (melt index measured at 270° C., according to ASTM standard D1238) value in a range of 0.1 to 20.