Method for manufacturing cation exchange membrane
US4693796A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1985 |
| Grant date | Sep 15, 1987 |
| Priority date | — |
| Expiry date | Oct 25, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/18
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A cation exchange membrane manufacturing method in which a film of a blend which consists of a perfluoro carbon polymer having a group transformable into a sulfonic acid group and a perfluoro carbon polymer having a group transformable into a carboxylic acid group or a film of a copolymer which consists of a perfluoro carbon monomer having a group transformable into a sulfonic acid group and a perfluoro carbon monomer having a group transformable into a carboxylic acid group and another film of a perfluoro carbon polymer having a group transformable into a carboxylic acid group are joined together. Following that, the group transformable into a carboxylic acid group and the group transformable into a sulfonic acid group are transformed respectively into the carboxylic acid group and the sulfonic acid group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.