The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 30, 2011
Filed:
Apr. 03, 2007
Giuseppe Marchionni, Milan, IT;
Ugo DE Patto, Cogliate, IT;
Pier Antonio Guarda, Arese, IT;
Solvay Solexis S.p.A., Milan, IT;
Abstract
A process for preparing monocarboxylic perfluoropolyethers of formula: A-O—(R)—(CFY)—C(O)OX (I) wherein: X is H, C-Calkyl, or an aryl group; Y=F, CF; t=1, 2 or 3; A is a C-Cperfluoroalkyl end group; z=0 or 1; Ris a perfluorooxyalkylene chain; having a number average molecular weight in the range 180-8,000; comprising the following steps: a) one or more distillations of perfluoropolyethers (PFPE) of formula T-O—(R)-T' (II) wherein: z and Rare as above defined; T, T′, equal to or different from each other, are selected from acyl fluoride or carbonyl-containing functional end groups and non functional end groups to obtain one PFPE fraction of formula (II) wherein the difference between the minimum and the maximum molecular weight of the components is lower than or equal to 600; b) partial fluorination of the fraction obtained in a); c) esterification c1) and/or hydrolysis c2) of the mixture obtained in b); d) distillation of the product obtained in c2) or in c1).