Process for obtaining (per)fluoropolyethers substituted at one or at both end groups with a halogen atom

US6191314A · kind A · utility

Assignee

• Ausimont S.p.A. · IT

Inventors

• Ivan Wlassics · Albenga, IT
• Vito Tortelli · Milano, IT

Key dates

• Filing date: Jun 9, 1999
• Grant date: Feb 20, 2001
• Expiry date: Jun 9, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/007
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for obtaining (per) fluoropolyethers substituted at one or at both end groups with a halogen atom selected from bromine or iodine, having the formula: EQU A--CF.sub.2 --O--(CF.sub.2 CF.sub.2 O).sub.p --(CF.sub.2 O).sub.q --CF.sub.2 --B (III) wherein PA1 A=B=halogen; or A=halogen and B=COOH or F, and the halogen is I or Br; PA1 p and q are integers such as to give a number average molecular weight (MW) in the range 350-5000 and the ratio p/q=0.5-2.0. The process includes treating di- or poly-acylperoxides having an average equivalent weight in the range 350-5000, of formula: EQU T--CF.sub.2 --O--[(CF.sub.2 CF.sub.2 O).sub.p --(CF.sub.2 O).sub.q --CF.sub.2 --CO--O--O----CO--CF.sub.2 --(OCF.sub.2).sub.q --(OCF.sub.2 CF.sub.2).sub.p ].sub.y --OCF.sub.2 --COOH (II) with a halogen selected from iodine or bromine, in a polyhalogenated organic solvent, at temperatures between 20.degree. and 80.degree. C.