Patent ID: 6191314
Filing Date: 2001-02-20
Classification: C08G

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: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)whereinA=B=halogen; or A=halogen and B=COOH or F, and the halogen is I or Br;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;said process consisting of treating di- or poly-acylperoxides having an average equivalent weight in the range 350-5000, of formula: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)wherein:y is an integer in the range 1-5;p and q are integers such as to give the indicated EW of formula (II) and the ratio p/q=0.5-2.0;T=COOH or F with the proviso that when T=COOH y=1-5, and when T=F then y=1with a halogen selected from iodine or bromine, in a polyhalogenated organic solvent, at temperatures between 20.degree. and 80.degree. C.