Patent ID: 7053148

Claim:
A process for manufacturing aqueous dispersions comprising the following successive process steps: a) preparing an anhydrous solution which comprises the components A), B) and C) and optionally a component D), b) dispersing the solution obtained according to step a) in water using a dispersant or a mixture of dispersants, c) removing component C), d) optionally combining the dispersion obtained according to process step c) with an aqueous dispersion which comprises a component D), where, at least for the case where the solution prepared in step a) does not comprise a component D), a process step d) is then carried out after step c), where component A) is a polyorganosiloxane whose end-groups are formed by units of the formula R 1 R 2 Si—O— and which contains units of the formula —Si(R)(R 2 )—O— in the chain, where the individual units —Si(R)(R 2 )—O— may be distributed arbitrarily over the polysiloxane chain, where all radicals R, independently of one another, are a linear or branched alkyl radical having 1 to 20 carbon atoms or the phenyl radical, all radicals R 1 , independently of one another, are R, H, (CH 2 ) u W or are a monovalent aliphatic radical which contains one or more amino groups, where u is a number from 0 to 4 and W is OH or OR, where all of the radicals R 2 present, independently of one another, are H, R, R 3 or X, where R 3 is an alkyl radical having 5 to 18 carbon atoms which is interrupted by an oxygen atom and/or in which two adjacent carbon atoms form an epoxy group together with an oxygen atom, or where R 3 is an alkyl radical having 2 to 12 carbon atoms which carries a phenyl radical as substituent, and where X is a monovalent hydrocarbon radical which contains one or more amino groups and/or one or more hydroxyl groups as substituents, where part or all of the amino groups present are optionally in quaternized form, where component B) is a fluorine-free diisocyanate or polyisocyanate whose NCO groups are 80 to 100% blocked, where component C) is a water-insoluble organic solvent which does not contain any OH groups and whose boiling point at atmospheric pressure is between 30° C. and 200° C. and where component D) is a polymer which contains one or more perfluorinated radicals (R F ) and no silicon, or where component D) is a mixture of such polymers.