Process for making polyimide-polydiorganosiloxane block polymers
US4011279A · kind A · utility
24Cited by
10References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 23, 1975 |
| Grant date | Mar 8, 1977 |
| Priority date | — |
| Expiry date | Sep 23, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G77/455
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process is provided for making polyimides having chemically combined polydiorganosiloxane blocks. An excess organic dianhydride is contacted with an organic diamine in a refluxing halogenated aromatic hydrocarbon solvent in the presence of an acid catalyst to produce an intermediate polyimide product. The temperature of the mixture is thereafter lowered, and amino-terminated polydiorganosiloxane is added to the mixture to effect the incorporation of polydiorganosiloxane blocks into the polyimide. There is produced clear polyimide-polydiorganosiloxane block polymer useful as an insulating layer on semi-conductor devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.