| 摘要 |
PURPOSE:To provide a titled exchange membrane which enables the electrolysis of an aq. soln. with high efficiency, by laminating the 1st film of a fluoropolymer contg. a cation exchange group and the 2nd film consisting of a fluoropolymer contg. a carboxylic acid group as an exchange group. CONSTITUTION:The 1st film of a fluoropolymer contg. a cation exchange group and the 2nd film which consists of a fluoropolymer contg. the carboxylic acid group having the repetitive units of the formulas (A), (B), (C) as an exchange group, is smaller in thickness than the above-mentioned 1st film and has large electric resistivity are laminated to obtain an improved cation exchange membrane for electrolysis. In the formulas, X, X'; -F, -Cl or -CF3, Rf; perfluoroalkyl group of 1-10 carbon atoms, M; hydrogen or alkali metal, Y; group selected among the formulas 1, 2, 3, 4, x, y, z; 0-10, Z; -F or the same as Rf, B/A+B+C (molar ratio); 0.01-0.3, C/A+B+C (molar ratio); 0.05-0.5.
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