Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Reexamination Certificate
2007-10-30
2007-10-30
Keys, Rosalynd (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
C568S615000, C568S621000, C568S682000, C568S683000, C568S684000
Reexamination Certificate
active
11176218
ABSTRACT:
A process for separating bifunctional perfluoropolyethers (PFPEs) having two terminations —CH2OH from their mixtures with monofunctional PFPEs with one termination —CH2OH, of general formulain-line-formulae description="In-line Formulae" end="lead"?X1—O—Rf—Y (I)in-line-formulae description="In-line Formulae" end="tail"?wherein Rf is a perfluoropolyoxyalkylene chain having a number average molecular weight of 500-10,000; X1and 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.
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Fontana Simonetta
Tchistiakov Alexandre
Tonelli Claudio
Arent & Fox LLP
Keys Rosalynd
Solvay Solexis S.p.A.
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