Crosslinked copolymers of aliphatic polyester diols and dianhydrides
US4997906A · kind A · utility
23Cited by
1References
7Claims
0Family size
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Key dates
| Filing date | Apr 3, 1990 |
| Grant date | Mar 5, 1991 |
| Priority date | — |
| Expiry date | Apr 3, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G31/11
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A crosslinked copolymer composition is derived from an aliphatic polyester, a dianhydride and a diisocyanate. The copolymer membrane has high thermal stability and good aromatic/saturate selectivity and permeability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.