Ion exchange membrane for electrolysis
US4872958A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 1988 |
| Grant date | Oct 10, 1989 |
| Priority date | — |
| Expiry date | Jun 15, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/18
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An ion exchange membrane for electrolysis comprising a first layer of a fluoropolymer having carboxylic acid groups as its ion exchange groups and facing a cathode, a second layer of a fluoropolymer having ion exchange groups, a specific resistance lower than that of the first layer and a thickness of at least 50% of the total thickness of the membrane, and a third layer of a fluoropolymer having ion exchange groups, a swelling degree higher by at least 5% than that of the second layer and a specific resistance lower by at least 30 .OMEGA..cm than that of the second layer, the first, second and third layers being laminated in this order.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.