Patent ID: 8404400

Claim:
A method (M-CCMP) to obtain a catalyst coated membrane precursor (CCMP), said method comprising: step (j), applying onto at least one surface of a membrane a catalyst-polymer liquid dispersion (LD), the liquid dispersion (LD) comprising (i) catalyst particles, (ii) polymer particles consisting of at least one (per)fluoro sulfonyl fluoride polymer in the —SO 2 F form, and (iii) an aqueous suspending medium, wherein said membrane is a film consisting of at least one (per)fluoro sulfonyl fluoride polymer in the —SO 2 F form; step (jj), removing the liquid of the liquid dispersion so as to form a multilayer structure comprising at least one coating solid layer adhering onto the at least one surface of the membrane, said at least one coating solid layer comprising catalyst particles and polymer particles, said polymer particles consisting of at least one (per)fluoro sulfonyl fluoride polymer in the —SO 2 F form; and optionally, step (jjj), hot pressing the multilayer structure.