Polyimide membranes and their use for gas separation
US4954144A · kind A · utility
24Cited by
12References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1989 |
| Grant date | Sep 4, 1990 |
| Priority date | — |
| Expiry date | Sep 12, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/1078
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention is a class of polyimide membranes wherein the diamine portion of the polymer structure is formed from 2,5-di-t-butyl-1,4-phenylenediamine. Membranes formed from polyimides containing this diamine structure exhibit unexpectedly high gas permeability properties and are especially useful for separating oxygen from nitrogen or air.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.