Patent ID: 8901186

Claim:
A process for producing a silica dispersion comprising a polyetherol or a polyether amine, the process comprising: (i) admixing an aqueous silica sol (K) with at least one additive selected from the group consisting of a polyetherol (b1) comprising at least one ethylene oxide unit, a polyetherol (b1) comprising at least one propylene oxide unit, a polyether amine (b2) comprising at least one ethylene oxide unit, and a polyether amine (b2) comprising at least one propylene oxide unit, wherein: the aqueous silica sol (K) has: an average particle diameter of from 1 to 150 nm; and a silica content, calculated as SiO 2 , of from 1 to 60% by weight based on the weight of the aqueous silica sol (K); and a pH of from 1 to 6; and the at least one additive has an average OH or amine functionality of from 2 to 6 and a number average molecular weight not to exceed 6000 g/mol; (ii) distilling off at least part of water present in an admixed dispersion; (iii) admixing an aqueous silica dispersion with at least one compound (S) comprising at least one monoalkoxylated silyl group and at least one substituent selected from the group consisting of an alkyl, a cycloalkyl, and an aryl, wherein: the at least one substituent optionally has at least one group which is reactive toward an alcohol, an amine or an isocyanate in an amount of from 0.1 to 20 μmol of the at least one compound (S) per m 2 of surface area of the aqueous silica sol (K); and the admixing (i) and the admixing (iii) can be carried out simultaneously or in succession in any order; and (iv) optionally adjusting the pH of a resulting admixture from (iii) to a value of from 7 to 12 by adding a basic compound.