Process for preparing hydrogen-terminated polyoxyperfluoroalkanes
AssigneeAusimont S.p.A.
InventorsGiuseppe Marchionni, Gianfranco Spataro, Ezio Strepparola
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Abstract
A process for preparing hydrogen-terminated polyoxyperfluoroalkanes having molecular weight lower than 1800, by decarboxylation of the corresponding polyoxyperfluoroalkanes having one or two end groups selected form --OCF.sub.2 COOZ, --OCF.sub.2 CF.sub.2 COOZ and --OCF(CF.sub.3)COOZ, wherein Z is an alkaline metal or ammonium, carried out in the presence of water at temperatures from 140.degree.-170.degree. C. and under a pressure of at least 4 atmospheres.
Claims8
Process for preparing polyoxyperfluoroalkanes having one or two end groups selected from --OCF.sub.2 H, --OCF.sub.2 CF.sub.2 H and --OCF(CF.sub.3)H and a number average molecular weight lower than 1800, said process consisting essentially of decarboxylating the salts formed by the corresponding polyoxyperfluoroalkanes having one or two end groups selected from --OCF.sub.2 COOZ, --OCF.sub.2 CF.sub.2 COOZ and --OCF(CF.sub.3)COOZ, wherein Z is a monovalent cation, in the presence of a medium consisting essentially of water, at temperatures from 140.degree. to 170.degree. C. and under a pressure of at least 4 atmospheres.
Dependencies are inferred from the claim text.