Four layer cation exchange fluoropolymer membrane

Details Four layer cation exchange fluoropolymer membrane Four layer cation exchange fluoropolymer membrane

1988-03-28

1991-01-08

Kilkosky, Peter F.

Chemistry: electrical and wave energy

Processes and products

204128, 204252, 204296, 521 27, 521 28, C25B 114, C01J 520

Patent

active

049832646

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 meq/g dry resin and having a thickness of from 50 to 250 .mu.m, 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 meq/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 perfluorcarbon polymer having carboxylic acid groups as its ion exchange groups with an ion exchange capacity of from 0.5 to 1.3 meq/g dry resin and having a thickness of from 5 to 50 .mu.m, said sulfonic acid film surface layer and carboxylic acid film surface layer constituting the outer-most layers, respectively.

REFERENCES:
patent: 4176215 (1979-11-01), Molner et al.
patent: 4251333 (1981-02-01), Glass
patent: 4267364 (1981-05-01), Grot et al.
patent: 4377137 (1982-06-01), Ezzell
patent: 4401711 (1983-08-01), Silva et al.
Patents Abstracts of Japan, vol. 6, No. 239 (C-137) (1117), 26th Nov. '82; & JP-A-57 141 428 (Toyo Soda Kogyo K.K.).
Patents Abstracts of Japan, vol. 6, No. 244 (C-138) (1122), 2nd Dec. '82; & JP-A-57 143 332 (Toyo Soda Kogyo K. K.) 04-09-1982 *whole document*.

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