Cation exchange fluoropolymer membrane

Details Cation exchange fluoropolymer membrane Cation exchange fluoropolymer membrane

C - Chemistry, Metallurgy

25

B

204/202

C25B 13/08 (2006.01) C08J 5/22 (2006.01) C25B 1/46 (2006.01) C25C 7/04 (2006.01)

Patent

CA 1265472

ABSTRACT A cation exchange fluoropolymer membrane comprising at least three integrally laminated layers including a main layer made of a perfluorocarbon polymer having carboxylic acid groups as its ion exchange groups with an ion exchange capacity of from 1.4 to 2.0 meg/g dry resin and having a thickness of from 50 to 250 µm, a sulfonic acid film surface layer formed on one side of said main layer, made of a perfluorocarbon polymer having sulfonic acid groups as its ion exchange groups with an ion exchange capacity of from 0.5 to 1.5 meg/g dry resin and having a thickness of from 5 to 50 m, and a carboxylic acid film surface layer formed on the other side of said main layer, made of a perfluorocarbon polymer having carboxylic acid groups as its ion exchange groups with an ion exchange capacity of from 0.5 to 1.3 meg/g dry resin and having a thickness of from 5 to 50 µm, said sulfonic acid film surface layer and carboxylic acid film surface layer constituting the outer-most layers, respectively.

481675

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