Polyimide aliphatic polyester copolymers (C-2356)
US4990275A · kind A · utility
33Cited by
11References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 4, 1990 |
| Grant date | Feb 5, 1991 |
| Priority date | — |
| Expiry date | May 4, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/16
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A new copolymer composition comprising the hard segment of a polyimide and the soft segment of an oligomeric aliphatic polyester. The new polyimide copolymer membranes have exhibited high thermal stability for separation of an aromatic/saturate mixture. These new membranes have higher aromatic/saturate selectivity than polyurethanes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.