Patent · US Expired

Separation of bifunctional perfluoropolyethers (PFPEs) having -CH2OH termination from their mixtures with -CH2OH monofunctional PFPEs

US7288682B2 · kind B2 · utility

7Cited by

14References

16Claims

0Family size

Assignee

SOLVAY SOLEXIS S.P.A. · IT

Inventors

Alexandre Tchistiakov · Milano, IT
Simonetta Antonella Fontana · Milano, IT
Claudio Adolfo Pietro Tonelli · Sesto San Giovanni, IT

Key dates

Filing date	Jul 8, 2005
Grant date	Oct 30, 2007
Priority date	—
Expiry date	Feb 21, 2026

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G65/007
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A process for separating bifunctional perfluoropolyethers (PFPEs) having two terminations —CH2OH from their mixtures with monofunctional PFPEs with one termination —CH2OH, of general formulaX1—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:

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.