Process for preparing sulfonated poly(aryl ether) resins
US4625000A · kind A · utility
10Cited by
13References
67Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 12, 1985 |
| Grant date | Nov 25, 1986 |
| Priority date | — |
| Expiry date | Jun 12, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/48
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Poly(aryl ether) resins having repeat units of the structure EQU --O--E--O--E'-- wherein E is the residuum of a dihydric phenol and E' is the residuum of a benzenoid compound having an inert electron withdrawing group in at least one of the positions ortho and para to the valence bonds, can be sulfonated by first reacting with a silyl halosulfonate, or the combination of a silyl halide and a halosulfonic acid, to form a resin having pendant silyl sulfonate groups, followed by the base cleavage of the silyl moiety to form the sulfonated resin. The sulfonated resins may be used to make membranes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.