Method for making polyetherimide
US4421907A · kind A · utility
6Cited by
2References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1983 |
| Grant date | Dec 20, 1983 |
| Priority date | — |
| Expiry date | Jan 21, 2003 |
Classification
- Technology area (CPC —)General
Abstract
Polyetherimides are formed by the dry blending of organodianhydride, organic diamine, and chain stopper and the polymerization of the dry-blended mixture in a continuous, steady state reaction, employing an extruder reactor as the reaction chamber. The extruder reactor is provided with means for heating and cooling, evacuation of water of reaction, and material conveyance means in order to achieve a steady state necessary for continuous production of a uniform polymeric product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.