Cation exchange membrane for electrolysis and process for producing potassium hydroxide of high purity
US5716504A · kind A · utility
6Cited by
10References
7Claims
0Family size
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Key dates
| Filing date | Jun 20, 1996 |
| Grant date | Feb 10, 1998 |
| Priority date | — |
| Expiry date | Jun 20, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/12
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A cation exchange membrane for electrolysis, which comprises at least 2 layers of fluorine-containing polymer films having sulfonic acid groups, wherein a first layer facing a cathode is made of a three component polymer of the following monomers (A), (B) and (C) and has a thickness of from 50 to 150 .mu.m, and a second layer has a thickness of from 50 to 300 .mu.m: PA1 (A) CF.sub.2 =CF(OCF.sub.2 CFCF.sub.3).sub.m O(CF.sub.2).sub.n SO.sub.3 M wherein m=0 or 1, n=1 to 5, and M is hydrogen or an alkali metal, ##STR1## wherein m=0 or 1, and Rf is a C.sub.1-10 perfluoroalkyl group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.