PERFLUOROPOLYETHERS CONTAINING A HALOGEN DIFFERENT FROM FLUORINE AND HAVING AN ACID END GROUP

摘要

Perfluoropolyethers having an acid end group of the type of acyl fluoride (or chloride) or a carboxylic group or derivatives thereof, the other end group being a perfluoroalkyl containing one or two halogen atoms different from fluorine, are useful as surfactants or as a protection against atmospheric agents. The polyethers are prepared by photooxidation of C3F6 and/or C2F4 in the presence of a thoroughly halogenated ethylene containing 1 to 4, preferably 1 or 2 atoms of halogen different from fluorine, and by subsequent thermal or photochemical decomposition treatment of the peroxide groups which are present in the photooxidation product.