Gas separation membrane
US5071452A · kind A · utility
83Cited by
21References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1990 |
| Grant date | Dec 10, 1991 |
| Priority date | — |
| Expiry date | Aug 13, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/1042
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Disclosed is a gas separation membrane, comprising a film with a thickness ranging from 0.05.10.sup.-6 to 20.10.sup.-6 m, at least 90% by mole of which is at least one aromatic polyimide or copolyimide, the recurrent unit of which corresponds to the following formula (I): ##STR1## where A represents a tetravalent aromatic radical at least 50% by mole of which are represented by the following formula (II): ##STR2## and B represents a bivalent aromatic radical or a mixture of bivalent aromatic radicals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.