Method for making polyetherimide
US4443592A · kind A · utility
15Cited by
2References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1983 |
| Grant date | Apr 17, 1984 |
| Priority date | — |
| Expiry date | Jan 21, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/1071
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polyetherimides are formed by the blending of a first melt of organic dianhydride and a second melt of organic diamine and the resulting blend is polymerized in a continuous, steady state manner, employing an extruder reactor as the reaction chamber. The extruder reactor is provided with means for heating, evacuation of water of reaction, and transfer sections in order to achieve the steady state necessary for continuous production of a substantially uniform polyimide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.