Polyimide precursor, cured product thereof, and processes for producing them
US5272247A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 1991 |
| Grant date | Dec 21, 1993 |
| Priority date | — |
| Expiry date | Oct 21, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K3/4676
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides a polyimide having all of small dielectric constant, small thermal expansion coefficient, high heat resistance, high glass transition temperature and high mechanical properties, a precursor of the polyimide, and processes for producing them. A polyimide precursor whose molecular chain comprises repeating units represented by the following general formula (1) and repeating units represented by the following general formula (2): ##STR1## wherein R.sup.1 is at least one kind of tetravalent organic group selected from the group consisting of ##STR2## R.sup.2 is at least one kind of divalent organic group having a linear structure which is selected from the group consisting of ##STR3## m is an integer of 1 to 4, and R.sup.3 is a divalent organic group having a non-linear structure which contains at least two aromatic rings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.