Tetrapolyimide film containing benzophenone tetracarboxylic dianhydride
US5196500A · kind A · utility
18Cited by
16References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1990 |
| Grant date | Mar 23, 1993 |
| Priority date | — |
| Expiry date | Dec 17, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31721
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Tetrapolyimide films derived from 3,3',4,4'-benzophenone tetracarboxylic dianhydride, pyromellitic acid dianhydride, p-phenylene diamine and 4,4'-diaminodiphenyl ether, and their preparation, are described. The tetrapolymer films have low water absorption, low coefficients of thermal and hygroscopic expansion, high modulus and are caustic etachable and can be used in flexible printed circuit and tape automated bonding applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.