Process for preparing membranes for separation of substances
US4046843A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 1975 |
| Grant date | Sep 6, 1977 |
| Priority date | — |
| Expiry date | Aug 20, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D67/009
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A semipermeable membrane is obtained by casting a cast solution comprising a mixture of a water-insoluble high polymer and a water-soluble high polymer, a mixture of a water-insoluble high polymer and a water-soluble surfactant or a mixture of a water-insoluble high polymer, a water-soluble high polymer and a water-soluble surfactant to form a shaped article, exposing the thus formed shaped article to a plasma to crosslink the surface thereof, and then washing the exposed article with water to remove uncrosslinked water-soluble high polymer or water-soluble surfactant. The membrane can be used for such substance separation methods as reverse osmosis, ultrafiltration and the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.