Aqueous coating compositions comprising one or more copolymers of acrylic esters or methacrylic esters, one or more polyurethanes bearing crosslinkable ethylenically unsaturated groups and optionally one or more additives wherein the copolymers of acrylic esters or methacrylic esters are based on ethylenically unsaturated monomers consisting of a) the monomers 2-ethylhexyl acrylate and n-butyl acrylate, the monomers a) being incorporated into the copolymers of acrylic esters or methacrylic esters to an extent of 20% to 80% by weight based on the total weight of copolymers of acrylic esters or methacrylic esters, b) 20% to 80% by weight, based on the total weight of copolymers of acrylic esters or methacrylic esters, of one or more ethylenically unsaturated monomer, the homopolymer of which has a glass transition temperature Tg according to DSC of ≥ 30°C, selected from the group consisting of styrene, alpha-methylstyrene, methyl methacrylate, tert-butyl methacrylate, tert-butyl acrylate, lauryl acrylate and stearyl acrylate, c) optionally 0.1% to 10% by weight, based on the total weight of copolymers of acrylic esters or methacrylic esters, of one or more ethylenically unsaturated monomers bearing acid groups selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid, fumaric acid, maleic acid, itaconic acid, acrylamidoglycolic acid, vinylsulfonic acid, methallylsulfonic acid, vinylbenzenesulfonic acid, acrylamidoethanesulfonic acid, acrylamido-2-methylpropanesulfonic acid, 2-sulfoethyl acrylate, 2-sulfoethyl methacrylate, 3-sulfopropyl acrylate and 3-sulfopropyl methacrylate, and d) optionally 0% to 5% by weight, based on the total weight of copolymers of acrylic esters or methacrylic esters, of one or more ethylenically unsaturated monomers d) bearing silane groups. one or more copolymers of acrylic esters or methacrylic esters, one or more polyurethanes bearing crosslinkable ethylenically unsaturated groups and optionally one or more additives wherein the copolymers of acrylic esters or methacrylic esters are based on ethylenically unsaturated monomers consisting of a) the monomers 2-ethylhexyl acrylate and n-butyl acrylate, the monomers a) being incorporated into the copolymers of acrylic esters or methacrylic esters to an extent of 20% to 80% by weight based on the total weight of copolymers of acrylic esters or methacrylic esters, b) 20% to 80% by weight, based on the total weight of copolymers of acrylic esters or methacrylic esters, of one or more ethylenically unsaturated monomer, the homopolymer of which has a glass transition temperature Tg according to DSC of ≥ 30°C, selected from the group consisting of styrene, alpha-methylstyrene, methyl methacrylate, tert-butyl methacrylate, tert-butyl acrylate, lauryl acrylate and stearyl acrylate, c) optionally 0.1% to 10% by weight, based on the total weight of copolymers of acrylic esters or methacrylic esters, of one or more ethylenically unsaturated monomers bearing acid groups selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid, fumaric acid, maleic acid, itaconic acid, acrylamidoglycolic acid, vinylsulfonic acid, methallylsulfonic acid, vinylbenzenesulfonic acid, acrylamidoethanesulfonic acid, acrylamido-2-methylpropanesulfonic acid, 2-sulfoethyl acrylate, 2-sulfoethyl methacrylate, 3-sulfopropyl acrylate and 3-sulfopropyl methacrylate, and d) optionally 0% to 5% by weight, based on the total weight of copolymers of acrylic esters or methacrylic esters, of one or more ethylenically unsaturated monomers d) bearing silane groups. a) the monomers 2-ethylhexyl acrylate and n-butyl acrylate, the monomers a) being incorporated into the copolymers of acrylic esters or methacrylic esters to an extent of 20% to 80% by weight based on the total weight of copolymers of acrylic esters or methacrylic esters, b) 20% to 80% by weight, based on the total weight of copolymers of acrylic esters or methacrylic esters, of one or more ethylenically unsaturated monomer, the homopolymer of which has a glass transition temperature Tg according to DSC of ≥ 30°C, selected from the group consisting of styrene, alpha-methylstyrene, methyl methacrylate, tert-butyl methacrylate, tert-butyl acrylate, lauryl acrylate and stearyl acrylate, c) optionally 0.1% to 10% by weight, based on the total weight of copolymers of acrylic esters or methacrylic esters, of one or more ethylenically unsaturated monomers bearing acid groups selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid, fumaric acid, maleic acid, itaconic acid, acrylamidoglycolic acid, vinylsulfonic acid, methallylsulfonic acid, vinylbenzenesulfonic acid, acrylamidoethanesulfonic acid, acrylamido-2-methylpropanesulfonic acid, 2-sulfoethyl acrylate, 2-sulfoethyl methacrylate, 3-sulfopropyl acrylate and 3-sulfopropyl methacrylate, and d) optionally 0% to 5% by weight, based on the total weight of copolymers of acrylic esters or methacrylic esters, of one or more ethylenically unsaturated monomers d) bearing silane groups.