Fluoroesin-coated polymer film for reinforcing polymer electrolyte membrane, reinforced polymer electrolyte membrane, and membrane electrode assembly

A fluororesin-coated polymer film for reinforcing a polymer electrolyte membrane, wherein said fluororesin-coated polymer film is fabricated by forming on at least one side of a polymer film a coating of a reaction product of (A) a fluorine-containing copolymer composed of a fluoroolefin represented by formula (1) below, a cyclohexyl group-containing acrylic ester represented by formula (2) below, and a hydroxyl group-containing vinyl ether represented by formula (3) below, and (B) a crosslinking agent having two or more isocyanate groups, said formulas (1), (2), and (3) being given as

• (where X is F or H, and Y is H, Cl, F, or CF3)
• (where R1 is a hydrogen or methyl group), and
• (where R2 is an alkylene group with a carbon number of 2 to 5 or a cyclohexylene group), wherein the fluororesin-coated polymer film is bonded to at least one side of said polymer electrolyte membrane with the fluororesin-coated face of said polymer film contacting a peripheral portion of said polymer electrolyte membrane in a frame-like manner.