C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
18/13, 204/202
C08J 5/22 (2006.01) C08F 8/04 (2006.01)
Patent
CA 1165066
ABSTRACT OF THE DISCLOSURE A cation exchange membrane of a fluorocarbon polymer containing pendant carboxylic acid and/or carboxylate groups, preferably having, at a predetermined ratio, pendant carboxylic acid and/or carboxylate groups and pendant sulfonic acid and/or sulfonate groups uniformly distributed therein,is produced by contacting with a reducing agent a fluorocarbon polymer containing pendant groups of the formula: -O(CF2) mSO2X wherein X is a fluorine atom, a chlorine atom, a hydrogen atom, M or OM in which M represents. a hydrogen atom, a metal atom or an ammonium group, and m is as defined above, and transforming the resultant to a film. An excellent double-layer type composite cation exchange membrane can be produced by laminating the above-mentioned membrane having pendant carboxylic acid and/or carboxylate groups and pendant sulfonic acid and/or sulfonate groups on a membrane of a fluorocarbon polymer containing pendant sulfonic acid and/or sulfonate groups. In such a type of double-layer cation exchange membrane, both the two membranes are based on the same kind of polymer and, hence, peeling-off at the interface of the two layers can be well prevented while exhibiting high current efficiency and low electrolytic voltage.
390623
Hane Toshioki
Ohmura Jukichi
Asahi Kasei Kogyo Kabushiki Kaisha
Ridout & Maybee Llp
LandOfFree
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