Method for making thianthrene dianhydride and polyimides obtained therefrom
US4864015A · kind A · utility
10Cited by
4References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1988 |
| Grant date | Sep 5, 1989 |
| Priority date | — |
| Expiry date | Nov 21, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31721
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method is provided for making 9,10-dithiaanthracene-2,3,6,7-tetracarboxylic acid dianhydride. Polyimides having improved oxidative stability also are provided which can be made intercondensing organic diamine and the aforementioned dianhydride or a dianhydride mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.