Laminated electrolytic cation exchange membrane including...

Details Laminated electrolytic cation exchange membrane including... Laminated electrolytic cation exchange membrane including...

C - Chemistry, Metallurgy

25

B

204/202

C25B 1/14 (2006.01) C08J 5/22 (2006.01)

Patent

CA 1234551

ABSTRACT: An electrolytic cation exchange membrane comprises a first film made of a fluorinated polymer having cation exchange groups and a second film laminated thereon, made of a fluorinated polymer having carboxylic acid groups as its ion exchange groups and containing the following repeating units (A), (B) and (C) and having a smaller thickness and greater specific electric resistance than the first film; (A) Image (B) Image (C) Image where each of X and X' is -F, -Cl or -CF3, Rf is a perfluoroalkyl group having from 1 to 10 carbon atoms, M is hydrogen or an alkali metal and Y is selected from the group consisting of Image , Image , Image and Image where each of x and y is an integer of from 0 to 10 and Z is -F or Rf as defined above, provided that B/(.DELTA.+8+C) (molar ratio) and C/(A+B+C) (molar ratio) are from 0.01 to 0.3 and from 0.05 to 0.5, respectively.

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