Photostructurable polyimide mixtures
US4851506A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1987 |
| Grant date | Jul 25, 1989 |
| Priority date | — |
| Expiry date | Dec 21, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L79/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to compositions comprising PA0 (a) at least one polyimide having an inherent viscosity of at least 0.1 dl/g (measured at 25.degree. C. on a 0.5% by weight solution in N-methylpyrrolidone) and containing at least 50 mol % of structural units of the formula I ##STR1## in which m and p independently of one another are integers from 0 to 4, n is an integer from 0 to 3, R.sup.1 and R.sup.2 independently of one another are C.sub.1 -C.sub.6 -alkyl or C.sub.1 -C.sub.6 -alkoxy and R.sup.3 is a divalent radical of an aromatic diamine which is substituted in at least one ortho-position relative to at least one N atom by alkyl, alkoxy, alkoxyalkyl, cycloalkyl or aralkyl or in which two adjacent C atoms of the aromatic radical are substituted by alkylene, and PA0 (b) at least one aromatic polyimide which is soluble in organic solvents and photocrosslinkable and which contains at least 50 mol %, relative to the total quantity of diamine units, of radicals R.sup.3 and at least 50 mol %, relative to the total quantity of aromatic tetracarboxylic acid units, of tetravalent aromatic tetracarboxylic acid radicals including at least one benzophenone unit. The polyimide mi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.