Patent ID: 7601449

Claim:
A fuel cell comprising an anode; a cathode; a proton exchange membrane disposed between the anode and cathode; an inlet for hydrogen fuel adjacent the anode; and an inlet for oxygen adjacent the cathode; wherein the proton exchange membrane comprises an insoluble sulfonated film having an ion exchange capacity of 0.64 meq/g or greater, wherein the film comprises A) a poly(arylene sulfide), B) an olefinic polymer comprising epoxy groups, and C) an elastomer, wherein the weight ratio of A/(B+C) is from 70/30 to 95/5, and the weight ratio B/C is from 10/90 to 80/20, wherein olefinic polymer B) comprises a copolymer of an olefin and a glycidyl ester of an α, β-ethylenically unsaturated acid.