Patent ID: 7795342

Claim:
A method of treating fiber materials which comprises applying an aqueous dispersion comprising a composition A combined with a polymer which comprises perfluoroalkyl groups thereto, said composition A being prepared by the following successive steps of: a) reacting a fluorine-free polyfunctional isocyanate mixture comprising about 80-95% by weight of a polymeric isocyanate and about 5-20% by weight of an alicyclic isocyanate and wherein each type of isocyanate has at least two free NCO groups per isocyanate molecule with a fluorine-free monohydric alcohol having 10 to 24 carbon atoms or a mixture of such alcohols by using 2 to 10 equivalents of NCO groups per equivalent of OH groups of the alcohol; b) reacting the product obtained in step a) with a ketone oxime in such proportions that there are still free isocyanate groups present in the resultant product mixture; and c) reacting the product mixture obtained in step b) with a fluorine-free organic amine which comprises two or three hydroxyl groups or with a fluorine-free polyhydric alcohol or with a mixture of such compounds in such proportions that the resultant product is free of isocyanate groups.