Development of polyimide foams with blowing agents
US4506038A · kind A · utility
19Cited by
6References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 3, 1982 |
| Grant date | Mar 19, 1985 |
| Priority date | — |
| Expiry date | Dec 3, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2379/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method of preparing a polyimide foam which includes the steps of: preparing, foaming, and curing a precursor containing at least one alkyl ester of 3,3'4,4'-benzophenonetetracarboxylic acid; a meta- or para-substituted aromatic diamine; a heterocyclic diamine; an aliphatic diamine; and a solid blowing agent. The blowing agent is added to said precursor in a concentration which is sufficient to effect at least one of the following attributes of the foam: cell size, proportion of open cells, cell density, and indentation load deflection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.