Patent ID: 7619044

Claim:
A composition comprising: a proton-conductive copolymer comprising a repeating unit represented by the following Formula (1), a repeating unit represented by the following Formula (2), and a repeating unit represented by the following Formula (3); and a cross-linked polymer obtained from a cross-linking reaction between a siloxane oligomer having an unsaturated bond and a cross-linking agent: wherein R 1 and R 2 are each independently selected from hydrogen, a halogen atom, or a halogenated C 1 -C 10 alkyl group, and p represents a molar amount ranging from 0.1 to 0.9; wherein R 3 and R 4 are each independently selected from hydrogen, a halogen atom, or a halogenated C 1 -C 10 alkyl group, R 5 represents —SO 3 H, —PO 3 H, or —CO 2 H, and q represents a molar amount ranging from 0.1 to 0.9; wherein R 6 represents a C 1 -C 10 alkyl group; and r represents a molar amount ranging from 0.1 to 0.9.