Patent ID: 8236206

Claim:
An electrode catalyst layer comprising catalyst particles, an ion exchange resin and a water repellent agent, wherein the ion exchange resin is a hydrocarbon type electrolyte, and the water repellent agent comprises at least one copolymer selected from the group consisting of (A) a fluorine-containing copolymer having a structure unit derived from a polyfluoroalkyl-containing (meth)acrylate, and (B) a fluorine-containing copolymer having a structure unit represented by the following general formula (1) derived from a fluorine-containing olefin monomer and a structure unit represented by the following general formula (2) derived from a vinyl ether monomer: in the formula (1), X 1 represents a fluorine atom, a fluoroalkyl group or a group represented by OW 1 wherein W 1 represents an alkyl group or a fluoroalkyl group, in the formula (2), X 2 represents a hydrogen atom or a methyl group, X 3 represents a group represented by (CH 2 ) h OW 2 wherein W 2 represent an alkyl group, a hydroxyalkyl group, a glycidyl group or a fluoroalkyl group, and h represents an integer of 0 to 2, OCOW3 wherein W 3 represents an alkyl group, a hydroxyalkyl group, or a glycidyl group, a carboxyl group or an alkoxycarbonyl group, wherein the electrode catalyst layer contains 0.1 to 20% by weight of the water repellant agent.