Verfahren zur Herstellung von Silica-haltigen Dispersionen enthaltend Polyetherole oder Polyetheramine

Method for producing silica-containing dispersions containing a polyetherol or a polyetheramine, comprising the steps (i) admixing an aqueous silica sol (K) having a median particle diameter of I to 150 nm having a silica content, calculated as Si02, of I to 60% by weight having a pH of I to 6 with at least one polyetherol (b I) and/or polyetheramine (b2) based on ethylene oxide and/or propylene oxide having a median OH- or amine functionality of2 to 6 and a number-average molecular weight of 62 to 6000 g/mol, (ii) at least partially distilling off the water, (iii) admixing the dispersion with at least one compound (S) that com­ prises at least one at least monoalkoxylated silyl group and at least one alkyl, cycloalkyl or aryl substituent, wherein this substitu­ ent can optionally comprise groups that are reactive to an alcohol, an amine or an isocyanate, in an amount of 0.1 to 20 µmol (S)\u3cbr/\u3eper m2 of surface area of (K), wherein the steps (i) and (iii) can be carried out simultaneously or in any sequence one after the\u3cbr/\u3eother, (iv) optionally setting the pH of the resultant silica-containing dispersions to a pH of 7 to 12 by adding a basic compound, wherein the step (iv) can alternatively be carried out between steps (ii) and (iii).\u3cbr/\u3