Defect-free ultrahigh flux asymmetric membranes
US4902422A · kind A · utility
40Cited by
29References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1988 |
| Grant date | Feb 20, 1990 |
| Priority date | — |
| Expiry date | Dec 6, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2325/022
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Defect-free, ultrahigh flux integrally-skinned asymmetric membranes having extremely thin surface layers (<0.2 .mu.m) comprised of glassy polymers are disclosed. The membranes are formed by casting an appropriate drope followed by forced convective evaporation of solvent to obtain a dry phase separated asymmetrical structure. The structure is then washed in a precipitation liquid and dried.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.