Process for preparing a composition comprising fumed metal oxides functionalized with oligomeric siloxanols, by intensively mixing (i) at least one aqueous, substantially completely hydrolyzed, oligomeric, and organofunctional siloxanol or a mixture of oligomeric, organofunctional siloxanols which is substantially free from organic solvents, in which each silicon atom of the siloxanol carries at least one functional group, and - the functional group is identical or different and is selected a) to an extent of 50% to 100% from the organofunctional groups aminoalkyl, N-alkylaminoalkyl, diaminoalkyl, triaminoalkyl, bis-N-aminoalkyl, bis-N-aminoalkylsilyl, tris-N-aminoalkyl, tris-N-aminoalkylsilyl, quaternary-aminoalkyl, mercaptoalkyl, methacryloyl, methacryloyloxyalkyl, hydroxyalkyl, epoxyalkyl, glycidyloxyalkyl, hydrolyzed glycidyloxyalkyl, polysulfane, disulfane, thioether, polyether, vinyl, alkyl, alkenyl, alkynyl, aryl, alkylaryl, haloalkyl, ureido, sulfanealkyl, cyanate and/or isocyanate groups, the organofunctional groups being linear, branched and/or cyclic, and b) to an extent of 0% to 50% the hydroxyl group, and the remaining free valences of the silicon atoms in the oligomeric siloxanols are satisfied by hydroxyl groups, with (ii) at least one fumed metal oxide selected from the group of silica, metal oxide modified silica, and a metal oxide comprising at least silicon, aluminum, zirconium, titanium, iron, cerium, indium, samarium, tin, zinc, antimony, arsenic, tantalum, rhodium, ruthenium, cobalt, nickel, copper, silver, germanium and/or corresponding mixed oxides, or metal oxides modified therewith, wherein the fumed metal oxide is added as metal oxide powder to the aqueous, oligomeric siloxanols and is dispersed with the oligomeric siloxanols with high input of energy by means of high stirring and/or mixing speeds. (i) at least one aqueous, substantially completely hydrolyzed, oligomeric, and organofunctional siloxanol or a mixture of oligomeric, organofunctional siloxanols which is substantially free from organic solvents, in which each silicon atom of the siloxanol carries at least one functional group, and - the functional group is identical or different and is selected a) to an extent of 50% to 100% from the organofunctional groups aminoalkyl, N-alkylaminoalkyl, diaminoalkyl, triaminoalkyl, bis-N-aminoalkyl, bis-N-aminoalkylsilyl, tris-N-aminoalkyl, tris-N-aminoalkylsilyl, quaternary-aminoalkyl, mercaptoalkyl, methacryloyl, methacryloyloxyalkyl, hydroxyalkyl, epoxyalkyl, glycidyloxyalkyl, hydrolyzed glycidyloxyalkyl, polysulfane, disulfane, thioether, polyether, vinyl, alkyl, alkenyl, alkynyl, aryl, alkylaryl, haloalkyl, ureido, sulfanealkyl, cyanate and/or isocyanate groups, the organofunctional groups being linear, branched and/or cyclic, and b) to an extent of 0% to 50% the hydroxyl group, and the remaining free valences of the silicon atoms in the oligomeric siloxanols are satisfied by hydroxyl groups, with - the functional group is identical or different and is selected a) to an extent of 50% to 100% from the organofunctional groups aminoalkyl, N-alkylaminoalkyl, diaminoalkyl, triaminoalkyl, bis-N-aminoalkyl, bis-N-aminoalkylsilyl, tris-N-aminoalkyl, tris-N-aminoalkylsilyl, quaternary-aminoalkyl, mercaptoalkyl, methacryloyl, methacryloyloxyalkyl, hydroxyalkyl, epoxyalkyl, glycidyloxyalkyl, hydrolyzed glycidyloxyalkyl, polysulfane, disulfane, thioether, polyether, vinyl, alkyl, alkenyl, alkynyl, aryl, alkylaryl, haloalkyl, ureido, sulfanealkyl, cyanate and/or isocyanate groups, the organofunctional groups being linear, branched and/or cyclic, and b) to an extent of 0% to 50% the hydroxyl group, and the remaining free valences of the silicon atoms in the oligomeric siloxanols are satisfied by hydroxyl groups, with a) to an extent of 50% to 100% from the organofunctional groups aminoalkyl, N-alkylaminoalkyl, diaminoalkyl, triaminoalkyl, bis-N-aminoalkyl, bis-N-aminoalkylsilyl, tris-N-aminoalkyl, tris-N-aminoalkylsilyl, quaternary-aminoalkyl, mercaptoalkyl, methacryloyl, methacryloyloxyalkyl, hydroxyalkyl, epoxyalkyl, glycidyloxyalkyl, hydrolyzed glycidyloxyalkyl, polysulfane, disulfane, thioether, polyether, vinyl, alkyl, alkenyl, alkynyl, aryl, alkylaryl, haloalkyl, ureido, sulfanealkyl, cyanate and/or isocyanate groups, the organofunctional groups being linear, branched and/or cyclic, and b) to an extent of 0% to 50% the hydroxyl group, (ii) at least one fumed metal oxide selected from the group of silica, metal oxide modified silica, and a metal oxide comprising at least silicon, aluminum, zirconium, titanium, iron, cerium, indium, samarium, tin, zinc, antimony, arsenic, tantalum, rhodium, ruthenium, cobalt, nickel, copper, silver, germanium and/or corresponding mixed oxides, or metal oxides modified therewith, wherein the fumed metal oxide is added as metal oxide powder to the aqueous, oligomeric siloxanols and is dispersed with the oligomeric siloxanols with high input of energy by means of high stirring and/or mixing speeds.