Ion-exchange group bearing composite membranes
US3945927A · kind A · utility
27Cited by
7References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 10, 1974 |
| Grant date | Mar 23, 1976 |
| Priority date | — |
| Expiry date | Sep 10, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2427/06
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Composite membranes bearing ion-exchange groups suitable for use in membrane separation processes are produced by providing a porous substrate which is physically semipermeable by itself, applying a coating composition consisting essentially of a filmforming polymeric material to which ion-exchange groups are introduceable and a liquid medium onto the surface of said substrate, removing said liquid medium to provide an ultrathin membrane of said material having a thickness less than 10 microns, and treating said ultrathin membrane to provide said ion-exchange groups throughout said ultrathin membrane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.