A process for coating of a cation exchange membrane on the basis of a fluorocarbon - polymer with a film made of a fluorocarbon - polymer

摘要

A method is provided for joining a fluorinated polymer film and a fluorinated polymer cation exchange membrane, which comprises subjecting the surface of a fluorinated polymer film to hydrophilic treatment, treating a fluorinated polymer cation exchange membrane containing pendent groups of sulfonic acid groups or sulfon amide groups with a tertiary amine, a quarternary ammonium base or a salt of the amine or base, then interposing a porous hydrophilic fluorinated polymer film between so treated film and so treated membrane, thereafter heat- pressing them. More improved joining of the fluorinated polymer film and the fluorinated polymer cation exchange membrane is achieved.