Patent ID: 7160968
Filing Date: 2007-01-09
Classification: C08F,H01B,H01M,Y02E,Y02P,Y10T

Abstract:
1. A proton-conductive polymer electrolyte composite membrane comprising a phosphoric acid group/sulfonic acid group-containing resin and a reinforcing sheet; wherein said polymer electrolyte composite membrane is in a fuel cell; wherein said phosphoric acid group/sulfonic acid group-containing resin is a copolymer of a phosphoric acid group-containing, unsaturated monomer (1) having at least one phosphoric acid group and at least one ethylenic unsaturated bond in a molecule, and an unsaturated monomer (2) other than said phosphoric acid group-containing, unsaturated monomer (1); wherein said unsaturated monomer (2) comprises an unsaturated monomer (2-1) having an acid group except for the phosphoric acid group, and optionally comprises an unsaturated monomer (2-2) having at least one ethylenic unsaturated bond other than said unsaturated monomer (2-1); wherein said unsaturated monomer (2-1) comprises a sulfonic acid group-containing, unsaturated monomer (2-1-1), said sulfonic acid group-containing, unsaturated monomer (2-1-1) having at least one sulfonic acid group and at least one ethylenic unsaturated bond in a molecule, and optionally comprises an unsaturated monomer (2-1-2), said unsaturated monomer (2-1-2) having an acid group except for a phosphoric acid group and a sulfonic acid group and at least one ethylenic unsaturated bond; wherein a weight ratio of(1)/(2) is 80/20–50/50; wherein a weight ratio of(2-1)/(2—2) is 100/0–50/50; wherein a weight ratio of (1)/(2-1-1) is 80/20–50/50; and wherein a weight ratio of (2-1-1)/(2-1-2) is 100/0–50/50.