Aqueous dispersion comprising hydrophobized silicon dioxide particles, characterized in that it comprises a. 50% - 80% by weight of water, b. 10% - 30% by weight of hydrophobized silicon dioxide particles, c. 5% - 15% by weight of at least one alcohol alkoxylate of the general formula R 1 O((CH 2) m O) n H, where R 1 is a branched or unbranched alkyl or alkenyl radical having 10 - 25 C atoms, m is 2 or 3 and n is 10 - 50, d. 0.5% - 5% by weight of at least one amine and/or amino alcohol having a molecular weight of less than 500 and e. 0% - 1% by weight of N-methylpyrrolidone, and the dispersion further comprises f. 0.1 - 1% by weight, based on the fraction of hydrophobized silicon dioxide particles, of at least one copolymer of the general formula where Z = where M is hydrogen, mono- or divalent metal cation, ammonium ion, organic amine radical, a is 1, or, if M is a divalent metal cation, a is 0.5 X is likewise -OM a or -O-(C p H 2p O) q - R 4, where R 4 is H, aliphatic hydrocarbon radical having 1 to 20 C atoms, cycloaliphatic hydrocarbon radical having 5 to 8 C atoms, optionally substituted aryl radical having 6 to 14 C atoms, p = 2 - 4, q = 0 - 100, -NHR 2 and/or -NR 2 2, where R 2 = R 1 or -CO-NH 2 Y is O, NR 2 A 1 is ethylene radical, propylene radical, isopropylene radical, butylene radical, m is 10 - 30, n is 0 - 50, k is 10 - 30, and the sum m+k is in the range of 20 - 60 and where g. the dispersion comprises 0.1 - 1.5% by weight of at least one polyethylene glycol and/or polypropylene glycol. all figures for weight percentages being based on the dispersion. a. 50% - 80% by weight of water, b. 10% - 30% by weight of hydrophobized silicon dioxide particles, c. 5% - 15% by weight of at least one alcohol alkoxylate of the general formula R 1 O((CH 2) m O) n H, where R 1 is a branched or unbranched alkyl or alkenyl radical having 10 - 25 C atoms, m is 2 or 3 and n is 10 - 50, d. 0.5% - 5% by weight of at least one amine and/or amino alcohol having a molecular weight of less than 500 and e. 0% - 1% by weight of N-methylpyrrolidone, and the dispersion further comprises f. 0.1 - 1% by weight, based on the fraction of hydrophobized silicon dioxide particles, of at least one copolymer of the general formula where Z = where M is hydrogen, mono- or divalent metal cation, ammonium ion, organic amine radical, a is 1, or, if M is a divalent metal cation, a is 0.5 X is likewise -OM a or -O-(C p H 2p O) q - R 4, where R 4 is H, aliphatic hydrocarbon radical having 1 to 20 C atoms, cycloaliphatic hydrocarbon radical having 5 to 8 C atoms, optionally substituted aryl radical having 6 to 14 C atoms, p = 2 - 4, q = 0 - 100, -NHR 2 and/or -NR 2 2, where R 2 = R 1 or -CO-NH 2 Y is O, NR 2 A 1 is ethylene radical, propylene radical, isopropylene radical, butylene radical, m is 10 - 30, n is 0 - 50, k is 10 - 30, and the sum m+k is in the range of 20 - 60 and where M is hydrogen, mono- or divalent metal cation, ammonium ion, organic amine radical, a is 1, or, if M is a divalent metal cation, a is 0.5 X is likewise -OM a or -O-(C p H 2p O) q - R 4, where R 4 is H, aliphatic hydrocarbon radical having 1 to 20 C atoms, cycloaliphatic hydrocarbon radical having 5 to 8 C atoms, optionally substituted aryl radical having 6 to 14 C atoms, p = 2 - 4, q = 0 - 100, -NHR 2 and/or -NR 2 2, where R 2 = R 1 or -CO-NH 2 Y is O, NR 2 A 1 is ethylene radical, propylene radical, isopropylene radical, butylene radical, m is 10 - 30, n is 0 - 50, k is 10 - 30, and the sum m+k is in the range of 20 - 60 and where g. the dispersion comprises 0.1 - 1.5% by weight of at least one polyethylene glycol and/or polypropylene glycol. all figures for weight percentages being based on the dispersion.