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

摘要

Process to obtain (per)fluoropolyethers substituted at one or at both end groups with an halogen atom selected between bromine or iodine, having the formula: A-CF2-O-(CF2CF2O)p-(CF2O)q-CF2-B wherein A = B = halogen; or A = halogen and B = COOH or F, and halogen = I or Br; p and q are integers such as to give number average molecular weight (MW) in the range 350-5000 and p/q = 0.5 - 2.0, consisting in treating, with an halogen selected between iodine or bromine in a polyhalogenated organic solvent, at temperatures in the range 20 DEG -80 DEG C, di- or poly-acylperoxides having average equivalent weight in the range 350-5.000, of formula: T-CF2-O-Ä(CF2CF2O)p-(CF2O)q-CF2-CO-O-O-CO-CF2-(OCF2)q- -(OCF2CF2)pÜy-OCF2-COOH 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 p/q = 0.5 - 2.0; T = COOH, F with the proviso that when T = COOH y = 1-5, when T = F y = 1.