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US 4,053,498 AGranted
Perfluoroalkylene ether-imidate and -thioimidate esters
AssigneeThe United States of America as represented by the Secretary of the Air Force
InventorRobert C. Evers
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Abstract
Hexafluoropropylene oxide-terminated perfluoroalkylene ether-imidate and -thioimidate esters are prepared by the reaction of certain perfluoroalkylene ether dinitriles with trifluoroethanol or ethanethiol. The compounds are useful as monomers in synthesizing thermooxidatively stable, low glass transition temperature perfluoroalkylene ether bibenzoxazole polymers with improved hydrolytic stability properties.
Claims6
A compound having the following formula:
- ##STR11## wherein X is SC.sub.2 H.sub.5 or OCH.sub.2 CF.sub.3 ;
- and R.sub.f ' is ##STR12## where m+n equals 4 or 5.
A mixture of compounds having the following formulas:
- ##STR13##
Dependencies are inferred from the claim text.