Process for the preparation of surface modified, multilayered, composite membranes for oxygen enrichment and the gas separation membranes
US5061301A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 1990 |
| Grant date | Oct 29, 1991 |
| Priority date | — |
| Expiry date | Aug 29, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2483/02
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for the preparation of surface modified, multilayered, composite membranes are disclosed. This process comprises the steps of: subjecting the surface of porous polysulfone membranes to sulfonation to introduce sulfonic acid functional groups onto the surface of the membranes; and either subjecting the sulfonic acid functional groups so introduced to silylation with reactive polysiloxanes to undergo grafting the polysiloxanes on the introduced functional groups, followed by applying polysiloxanes coating along with cross-linking agent onto so treated membranes to allow to undergo cross-linking; or carrying out both the silylation step and the coating and cross-linking step simultaneously. The membranes so produced are useful in gas separation systems for oxygen enrichment of air.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.