Patent ID: 8882901

Claim:
An aqueous dispersion, comprising: 50%-80% by weight of water; 10%-30% by weight of hydrophobized silicon dioxide particles; 5%-15% by weight of at least one alcohol alkoxylate of the formula: R 1 O((CH 2 ) m′ O) n′ H; 0.5%-5% by weight of at least one component selected from the group consisting of an amine and an amino alcohol having a molecular weight of less than 500; 0%-1% by weight of N-methylpyrrolidone; 0.1-1.5% by weight of at least one of polyethylene glycol and polypropylene glycol; wherein the weight percentages are based on the total weight of the dispersion; and 0.1-1% by weight, based on the total weight of the hydrophobized silicon dioxide particles, of at least one copolymer of the formula (I): wherein: R 1 represents a branched or unbranched alkyl or alkenyl radical comprising 10-25 C atoms; m′ represents 2 or 3; n′ represents 10-50; Z represents: either M is hydrogen, a mono- or divalent metal cation, an ammonium ion, or an organic amine radical and a is 1, or M is a divalent metal cation and a is 0.5; X represents: —OM a , —O—(C p H 2p O) q —R 4 , —NHR 2 , or NR 2 2 ; R 4 represents H, an aliphatic hydrocarbon radical comprising 1 to 20 C atoms, a cycloaliphatic hydrocarbon radical comprising 5 to 8 C atoms, or optionally a substituted aryl radical comprising 6 to 14 C atoms; p represents 2-4; q represents 0-100; R 2 represents R 1 or —CO—NH 2 ; Y represents O or NR 2 ; m represents 10-30; A 1 represents an ethylene radical, a propylene radical, an isopropylene radical, or a butylene radical; n represents 0-50; k represents 10-30; and the sum m+k is in a range of 20-60.