Closed cell polyimides
US4070312A · kind A · utility
27Cited by
4References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 27, 1975 |
| Grant date | Jan 24, 1978 |
| Priority date | — |
| Expiry date | May 27, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/918
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Closed cell polyimide foams. Methods of making such foams from precursors derived from a benzophenonetetracarboxylic acid diester and a mixture of diamines in which the precursor is molded to shape and cured, hydrated, and heated until a porous, closed cell structure develops.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.