Patent ID: 8864895

Claim:
A process for producing an aqueous composition, the process comprising: (i) hydrolyzing and condensing at least one aminoalkylalkoxysilane selected from the group consisting of a monoaminoalkylalkoxysilane, a bisaminoalkylalkoxysilane and a trisaminoalkylalkoxysilane, and optionally at least one alkoxysilane selected from the group consisting of a fluoroalkylalkoxysilane, an alkylalkoxysilane and a tetraalkoxysilane, within a reaction mixture, in the presence of at least one catalyst and water and optionally at least one solvent/diluent; then (ii) at least partially removing from the reaction mixture the solvent/diluent and a hydrolysis alcohol, which is formed during the hydrolyzing and condensing (i); (iii) optionally adding additional water or an aqueous acid to the reaction mixture, such that the pH of the reaction mixture is adjusted to a value in the range from 2 to less than 7; and subsequently (iv) adding a metal salt selected from the group consisting of an acetate salt or a nitrate salt of aluminum, chromium in oxidation state 3+, and cerium in oxidation state 3+ or 4+.