Process for preparing polyimides
US4835249A · kind A · utility
24Cited by
13References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 31, 1986 |
| Grant date | May 30, 1989 |
| Priority date | — |
| Expiry date | Dec 31, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/1032
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for making certain polyimides involves dissolving substantially equimolar amounts of an aromatic dianhydride and an organic diamine in a high-boiling, aprotic solvent, heating the reaction solution to form an insoluble polyimide prepolymer and to distill out water of reaction, separating the solid polyimide prepolymer and melt polymerizing the polyimide prepolymer to form the desired polyimide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.