Alkylated 1,1-bis(4-aminophenyl)-1-phenyl-2,2,2-trifluoroethanes
US4990667A · kind A · utility
2Cited by
8References
4Claims
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Key dates
| Filing date | Jan 29, 1990 |
| Grant date | Feb 5, 1991 |
| Priority date | — |
| Expiry date | Jan 29, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/1039
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Diamine compounds having the structural formula: ##STR1## wherein R.sup.1 and R.sup.2 are independently methyl, ethyl or isopropyl groups, can be used in preparing various polymers which are useful in gas separation membranes. The combined effect of alkyl substituents ortho to the amino groups along with the specific bridging group imparts useful properties to polymeric membranes formed with these diamines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.