Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1977-07-21
1978-09-19
Lee, Lester L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528211, C08G 7322
Patent
active
041153677
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.
REFERENCES:
patent: 3846376 (1974-11-01), Evers
patent: 3994861 (1976-11-01), Evers
Kuhn Cedric H.
Lee Lester L.
Rusz Joseph E.
The United States of America as represented by the Secretary of
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