Polyimides
US4241193A · kind A · utility
23Cited by
3References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 21, 1978 |
| Grant date | Dec 23, 1980 |
| Priority date | — |
| Expiry date | Aug 21, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/918
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Polyimide foams derived from mixtures of aromatic diamines and partial esters of a benzophenonetetracarboxylic acid. The precursors are converted into polyimide foams by the application of heat; and the foams are then compressed, yielding dense, rigid, and structurally strong, intumescent materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.