Sulfonated polyimide gas separation membranes
US5725633A · kind A · utility
21Cited by
40References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1996 |
| Grant date | Mar 10, 1998 |
| Priority date | — |
| Expiry date | Jun 6, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/1064
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Novel polyimide gas separation membranes and the process of using such membranes to separate gases are disclosed. The polyimides are formed from rigid aromatic dianhydrides and aromatic diamines that contain sulfonic acid, salified sulfonic acid, or sulfonic ester groups. Methods of preparing improved composite gas separation membranes from the sulfonated polyimides of this invention are disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.