Method of manufacturing a semipermeable membrane from a water-soluble polymeric resin
US3992495A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 1974 |
| Grant date | Nov 16, 1976 |
| Priority date | — |
| Expiry date | Sep 6, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J7/123
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Ultrathin membranes for separating substances are obtained by exposing shaped articles comprising a water-soluble polymer or a mixture of a water-soluble polymer and water-insoluble polymer to a plasma of a gas selected from helium, argon, nitrogen, hydrogen, oxygen, carbon monoxide, carbon dioxide, ammonia, a hydrocarbon having 1 to 10 carbon atoms, an epoxide having 2 to 10 carbon atoms, or an alkylamine, or a mixture of these substances to crosslink the surface layer, and then washing the exposed articles with water to remove the unreacted portions. The membrane exhibits outstanding performance characteristics when used in the processes for separating or concentrating substances, such as reverse osmosis, ultrafiltration, and the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.