Fluorinated cation exchange membrane and use thereof in electrolysis of alkali metal halide
US4126588A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1976 |
| Grant date | Nov 21, 1978 |
| Priority date | — |
| Expiry date | Dec 28, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/18
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A fluorinated cation exchange membrane is made of three component copolymer produced by copolymerizing a fluorovinylpolyether having the formula I EQU cf.sub.2 .dbd. cf--o-cf.sub.2 --(cfxocf.sub.2).sub..alpha. --(cfx').sub..beta. --(cf.sub.2 ocfx").sub..gamma. --a wherein .alpha. is 0 to 3; .beta. is 0 to 6; .gamma. is 0 to 4 and either .alpha. or .gamma. is not 0; X, X' and X" respectively represent --F or a C.sub.1-5 perfluoroalkyl group; A represents --CN--, --COF, --COOH, --COOR.sub.1, --COOM or --CONR.sub.2 R.sub.3 ; R.sub.1 represents a C.sub.1-10 alkyl group preferably a C.sub.1-3 alkyl group, R.sub.2 and R.sub.3 respectively represents hydrogen atom or a C.sub.1-10 alkyl group; and M represents an alkali metal atom or a quaternary ammonium group, a fluorovinyl compound having the formula II EQU cf.sub.2 .dbd. cf--(o).sub..delta. --(cfy).sub..gamma. --a' wherein .delta. is 0 to 1; .gamma. is 1 to 6; Y represents --F or a C.sub.1-5 perfluoroalkyl group; A is defined in the formula I and a fluorinated olefin having the formula III EQU cf.sub.2 .dbd. czz' wherein Z and Z' respectively represent --H, --Cl, --F or --CF.sub.3, and if necessary hydrolyzing the copolymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.