Novel copolyamideimides, prepolymers therefor and method for their preparation
US4728697A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1985 |
| Grant date | Mar 1, 1988 |
| Priority date | — |
| Expiry date | Sep 27, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01B3/306
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Carboxy-terminated prepolymers are prepared by the reaction of a diamine, preferably an aromatic diamine, or a mixture thereof with a triamine, with a carboxy anhydride such as trimellitic anhydride and a dianhydride such as bisphenol A dianhydride. The prepolymers, or functional derivatives thereof, are then reacted with a diisocyanate or diamine, or a mixture thereof with a triisocyanate or triamine, preferably an aromatic diisocyanate, to produce copolyamideimides. The products prepared using triamines or triisocyanates are crosslinked. Other products containing alkyl or alicyclic groups attached to aromatic radicals can be oxidatively crosslinked, e.g., by heating in air.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.