Preparation of polyimide polymers
US6713597B2 · kind B2 · utility
7Cited by
28References
50Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 19, 2002 |
| Grant date | Mar 30, 2004 |
| Priority date | — |
| Expiry date | Mar 19, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31721
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for the preparation of a reactive friable polyimide powder comprises dissolving an aromatic dianhydride and an organic diamine in a high-boiling, aprotic organic solvent to form a reaction solution; heating the reaction solution under imidization conditions to form an insoluble reactive polyimide and to effect substantially complete distillation of the water of reaction out of the reaction solution; and separating the insoluble reactive polyimide from the reaction solution to form a reactive friable polyimide powder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.