Polyamide acid composition for preparing polyimide
US4515915A · kind A · utility
2Cited by
8References
3Claims
0Family size
Assignee
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Key dates
| Filing date | Jan 13, 1984 |
| Grant date | May 7, 1985 |
| Priority date | — |
| Expiry date | Jan 13, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/1007
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polyamide acid composition for preparing a polyimide which is improved in the stability in a form of solution and can extend the pot life of the composition comprising a solution of a polyamide acid in an organic solvent, the polyamide acid being a precursor of the polyimide, and an N-substituted heterocyclic compound as a chemical treating agent which can lower a rate of conversion of the polyamide acid to the polyimide. The pot life can be extremely extended to give the composition an enough flowability for a long time without reducing the excellent properties such as a heat resistance of the obtained polyimide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.