Perfluoroalkylene ether bibenzoxazole polymers
US4115367A · kind A · utility
2Cited by
2References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 21, 1977 |
| Grant date | Sep 19, 1978 |
| Priority date | — |
| Expiry date | Jul 21, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/22
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Thermooxidatively and hydrolytically stable perfluoroalkylene ether bibenzoxazole polymers having improved viscoelastic properties are synthesized by the polycondensation of perfluoroalkylene ether bis(o-aminophenol) compounds with thioimidate esters derived primarily from tetrafluoroethylene oxide but end-capped with hexafluoropropylene oxide. Based on their lower glass transition temperature, the polymers have a very broad use temperature range which renders them particularly useful under severe environmental conditions encountered in aerospace elastomer applications such as seals and sealants.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.