Polyimide foams
US4332656A · kind A · utility
21Cited by
2References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1981 |
| Grant date | Jun 1, 1982 |
| Priority date | — |
| Expiry date | Apr 10, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2379/08
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Copolymide foams derived from a diester of 3,3',4,4'-benzophenonetetracarboxylic acid, an aromatic diamine, and a heterocyclic diamine. A molar concentration of the heterocyclic diamine approaching but not exceeding 0.42 is employed. This results in a flexible foam with a homogeneous cellular structure and a reduced compression set loss.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.