C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 65/30 (2006.01)
Patent
CA 2511860
A process for separating bifunctional perfluoropolyethers (PFPEs) having two terminations -CH2OH from their mixtures with monofunctional PFPEs with one termination -CH2OH, of general formula X1-O-Rf-Y (I) wherein Rf is a perfluoropolyoxyalkylene chain having a number average molecular weight of 500-10,000; X1 and Y are end groups selected from -CFXCH2OH (wherein X is F or CF3), -CF3, -CF2Cl, -CF2CF2Cl, -C3F6Cl, -CF2Br, -CF2CF3, wherein at least one of the two end groups is -CFXCH2oH, said process comprising the steps of: a) addition of the PFPE mixture to an adsorbing solid phase, under stirring; b) filtration of the mixture obtained in a): c) addition to the solid phase filtered in b), of a PFPE mixture having an average functionality higher than that of the PFPE mixture of the liquid filtered in b); c2) filtration of the mixture obtained in c); and subsequent treatment of the solid phase separated in c2) with a polar solvent obtaining a liquid containing the PFPE having high functionality.
Fontana Simonetta
Tchistiakov Alexandre
Tonelli Claudio
Blake Cassels & Graydon Llp
Solvay Solexis S.p.a.
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