Asymmetric polyimide membranes
US5067970A · kind A · utility
31Cited by
12References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 11, 1990 |
| Grant date | Nov 26, 1991 |
| Priority date | — |
| Expiry date | May 11, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2325/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An asymmetric membrane and a method for its preparation is disclosed. The membrane is suitable for gas separation, reverse osmosis and pervaporation applications and is characterized in that it is based on a fully imidized 5(6)-amino-1-(4'-aminophenyl)-1,3-trimethylindane polymer having pore diameters of less than 20 .ANG. units, CO.sub.2 /CH.sub.4 selectivity of at least 20 and CO.sub.2 permeability of at least 1.0 SCFH/ft.sup.2 at 100 p.s.i.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.