Method for producing polyimide foam of desired density
US5077318A · kind A · utility
6Cited by
19References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1991 |
| Grant date | Dec 31, 1991 |
| Priority date | — |
| Expiry date | Jun 24, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2379/08
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Polyimide foam of desired density is produced by adding to a polyimide precursor comprising carboxylic and diamine components at least one foam-enhancing polar, protic additive of the formula ROH, where R is hydrogen, or C.sub.1 to C.sub.12 linear or branched alkyl or cycloalkyl, unsubstituted or substituted with halo, aryl, alkoxy or hydroxy, and heating the resultant slurry to a temperature that does not exceed about 105.degree. C. to form a homogeneous melt. When heated to a higher temperature the melt foams and cures. The density of the foam is affected by the amount of foam-enhancing additive which is utilized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.