Patent ID: 6110230
Filing Date: 2000-08-29
Classification: C08G,C14C

Abstract:
A method for hydrophobicizing leather or fur skins, involving the step of treating the leather or fur skins with carboxyamide-polysiloxanes of the formula IV ##STR33## in which R, R', and R"", each independently, are selected from C.sub.1-6 -alkyl or phenyl, or carboxyamide-polysiloxanes of the formula IVa ##STR34## wherein R' and R"", each independently, are selected from C.sub.1-6 -alkyl, C.sub.1-6 -alkoxy, OH or phenyl, and R'"" is OCH.sub.3 and the number of types of structural units defined by ##STR35## is at least one and a is selected from the range 0.ltoreq.a.ltoreq.2 and b is selected from the range 1.ltoreq.b.ltoreq.3, and the number of repetitions of the types of structural units which is defined by the variables m, n and k is selected from the ranges 1.ltoreq.n.ltoreq.60,20.ltoreq.m.ltoreq.800 and0.ltoreq.k.ltoreq.{(2-b)m+[(1-a)n+2]}and B is an organic radical of the formula V ##STR36## in which p=0-10 and each of Y and Z, independently, is a divalent aliphatic hydrocarbon radical or is a divalent alkoxyalkyl radical, and X is a divalent hydrocarbon radical from the group of --(CH.sub.2).sub.y -- where 2.ltoreq.y.ltoreq.6, CH.sub.2 --CHR.sup.5 --, --CHR.sup.5 --C.sub.2 H--, cyclic or bicyclic, saturated of unsaturated hydrocarbon radicals or aromatic hydrocarbon radicals and --CH.dbd.CH-- wherein R.sup.5 is C.sub.1-20 alkyl or C.sub.2-20 -alkenyl, where optionally some of the substituents B are replaced by the substituents A of the following formula II ##STR37## in which Y, p and Z are as defined above, or by the substituents C of the following formula ##STR38## the carboxyamide-polysiloxanes of the above formula IV or IVA having a carboxyl content of from 0.02 to 1.0 mmol/g and an average molar mass (number average)M.sub.n in the range from 2.times.10.sup.3 to 60.times.10.sup.3 gmol.