Process for separating from one another the non-functional, monofunctional and bifunctional species contained in the perfluoropolyoxyalkylenes

US5262057A · kind A · utility

Assignee

• Ausimont S.p.A. · IT

Inventors

• Claudio Tonelli · Vimercate, IT
• Stefano Turri · Milano, IT
• Giuseppe Gianotti · Novara, IT
• Marinella Levi · Milano, IT

Key dates

• Filing date: Oct 19, 1992
• Grant date: Nov 16, 1993
• Expiry date: Oct 19, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/30
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for separating from one another non-functional, monofunctional and bifunctional species in a mixture of perfluoropolyoxyalkylenes of general formula EQU X--O--Rf--Y where: PA0 Rf=a perfluoropolyoxyalkylene chain comprising monomeric units of formulas (CF.sub.2 O), (CF.sub.2 CF.sub.2 O), (CF.sub.2 CF.sub.2 CF.sub.2 O), PA0 X, Y, like or different from each other, are non-functional end groups or end groups containing functions OH and/or NH.sub.2, which consists in subjecting said mixture of perfluoropolyoxyalkylenes to column chromatography using, as eluents, non-polar fluorinated solvents, either alone or in admixture with polar solvents.