Polyimide varnish
US5916632A · kind A · utility
48Cited by
5References
8Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 8, 1997 |
| Grant date | Jun 29, 1999 |
| Priority date | — |
| Expiry date | Dec 8, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/1032
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polyimide varnish which is a solution having a polyimide and/or a polyimide precursor dissolved in an organic solvent and which is useful for forming a polyimide coating film on a substrate by coating the solution on the substrate followed by heat treatment, wherein from 5 wt % to 60 wt % of the organic solvent is a polypropylene glycol derivative of the formula (I): ##STR1## wherein n is 1 or 2, and R is hydrogen, a C.sub.1-4 alkyl group, a C.sub.1-4 alkenyl group or a C.sub.1-4 alkanoyl group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.