Patent ID: 9059448
Filing Date: 2015-06-16
Classification: C08J,H01M,Y02E,Y02P

Abstract:
1. A method for producing a polymer electrolyte membrane, comprising: removing by centrifugal separation at least a portion of a salt component comprising a salt and produced during polycondensation from a polymerization solution of a polymer electrolyte having a density of an ionic group of 2 mmol/g or more, subsequent to polycondensation, the removing being without precipitation of a polymer in water or solvent prior to centrifugal separation, thereby preparing a coating solution; applying the coating solution on a substrate; removing at least a part of a solvent from the coating solution to form a film-shaped material on the substrate; and bringing the film-shaped material on the substrate into contact with water and/or an aqueous acidic solution to remove at least a portion of the salt component produced during the polycondensation wherein C3<5%, and C4/C3<0.3, when a concentration of the salt component contained in the film-shaped material on the substrate after removing at least a part of said solvent is denoted by C3% by weight, and a concentration of the salt component after bringing the film-shaped material on the substrate into contact with water and/or an aqueous acidic solution to remove at least a portion of the salt component produced during polycondensation is denoted by C4% by weight.