Patent ID: 7857935

Claim:
A process for producing a membrane-electrode assembly for polymer electrolyte fuel cells, which comprises a first electrode comprising a catalyst layer and a gas diffusion layer, a second electrode comprising a catalyst layer and a gas diffusion layer, and a polymer electrolyte membrane disposed between the catalyst layer of the first electrode and the catalyst layer of the second electrode, said process comprising the following steps (a) to (c) and (g): (a) a step of applying a coating solution containing an electrode catalyst and an ion exchange resin on a substrate film to form a coating solution layer, (b) a step of putting a gas diffusion layer on the coating solution layer formed in the step (a), followed by drying the coating solution layer to form a catalyst layer, (c) a step of removing the substrate film from the catalyst layer formed in the step (b) to obtain the first electrode, and (g) a step of heat-bonding the first electrode, the second electrode and the polymer electrolyte membrane, to have the catalyst layer and the polymer electrolyte membrane contacted to each other.