Polyimide derivatives having unsaturated terminal amic acid groups
US4316844A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 1980 |
| Grant date | Feb 23, 1982 |
| Priority date | — |
| Expiry date | Jan 25, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/14
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Novel compositions comprising unsaturated polyhemi-amic acid compositions and processes for their preparation are disclosed herein. These new compositions are primarily derivatives of anhydride-terminated aromatic polyimides from which they are prepared by amidation to provide unsaturated amide groups having terminal --CH.dbd.CH.sub.2 groups as hemi-amic acid groups or their derivatives. These new compositions are more tractable than the original anhydride-terminated polyimides and can be converted at appropriate lower temperatures to crosslinked, insoluble, infusible polymers without by-product formation thereby extending greatly the applications for which the aromatic polyimides can be employed. Also included are monomeric compounds containing unsaturated amide groups derived from monomeric tetracarboxylic dianhydrides. These are particularly useful as crosslinking agents.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.