Thermally adaptive polymers and prepolymers and methods of making in which an imide is formed from a polyanhydride oligomer and an isocyanate
US4687785A · kind A · utility
7Cited by
11References
59Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 27, 1985 |
| Grant date | Aug 18, 1987 |
| Priority date | — |
| Expiry date | Aug 27, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/1067
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Reaction of an aromatic dianhydride with a polycyclic aromatic primary diamine at a controlled reaction rate yields a diamic acid dianhydride oligomer. The oligomer may be a precursor for an imide foam which forms at low temperature, has outstanding physical characteristics, and is extremely heat resistant. The diamic acid moiety may be converted to diimide, and other modifications of the oligomer are disclosed. Other derivatives of the oligomers are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.