Aqueous UV-curable polyisocyanate-based dispersions as binders for producing paints, comprising the following components a) 35 to 75% by weight of a polyisocyanate component a) having a mean functionality of not less than 2.2, consisting of not less than 40% by weight of liquid oligomeric polyisocyanates based on hexamethylene diisocyanate having isocyanurate, biuret, uretdione, carbodiimide and/or iminooxadiazinedione structural units and not more than 60% by weight of isophorone diisocyanate, toluene H6-2,4- and 2,6-diisocyanate, 1,6-hexamethylene diisocyanate, 4,4'-diisocyanatodicyclohexylmethane and/or 2,4'-diisocyanatodicyclohexylmethane and/or 2,2'-diisocyanatodicyclohexylmethane and/or toluene 2,4- and 2,6-diisocyanate, and the reaction products thereof with trimethylolpropane, butanediol, ethylene glycol, diethylene glycol, propylene glycol or neopentyl glycol, b) 10 to 50% by weight of one or more monohydroxy-functional compounds having (meth)acryloyl groups, c) 1.5 to 19% by weight of a component c), wherein the component c) comprises at least one component c1) that, on account of (potentially) ionic groups in the structure thereof, has a hydrophilizing action and has at least one further isocyanate-reactive group, and at least one component c2) that has groups having a nonionically hydrophilizing action and contains at least one further isocyanate-reactive group, d) 0.1 to 10% by weight of one or more di- and/or polyfunctional amines or hydroxyamines as chain extenders, and e) optionally other monomeric, oligomeric and/or polymeric substances, which may optionally also have further unsaturated groups, selected from low-molecular-weight diols and/or polymer diols or epoxy acrylates, ester acrylates, polyester acrylates and/or products of the reaction of monoepoxides with unsaturated fatty acids, wherein the stated percentages for a) to d) add up to 100% and the ratio of the equivalents of isocyanate groups in component a) to the sum of the equivalents of isocyanate-reactive hydroxy and/or amino groups in components b), c) and optionally e) is between 0.95:1 and 1.39:1, and wherein the UV-curable polyisocyanate-based dispersions, in consequence of the incorporation of component c), have acid values of 0 to 26 mg KOH/g of substance based on the solids content, the content of urethane groups is in the range from 8 to 30% by weight based on the solids content and the UV-curable polyisocyanate-based dispersions contain less than 5% by weight of organic solvents. a) 35 to 75% by weight of a polyisocyanate component a) having a mean functionality of not less than 2.2, consisting of not less than 40% by weight of liquid oligomeric polyisocyanates based on hexamethylene diisocyanate having isocyanurate, biuret, uretdione, carbodiimide and/or iminooxadiazinedione structural units and not more than 60% by weight of isophorone diisocyanate, toluene H6-2,4- and 2,6-diisocyanate, 1,6-hexamethylene diisocyanate, 4,4'-diisocyanatodicyclohexylmethane and/or 2,4'-diisocyanatodicyclohexylmethane and/or 2,2'-diisocyanatodicyclohexylmethane and/or toluene 2,4- and 2,6-diisocyanate, and the reaction products thereof with trimethylolpropane, butanediol, ethylene glycol, diethylene glycol, propylene glycol or neopentyl glycol, b) 10 to 50% by weight of one or more monohydroxy-functional compounds having (meth)acryloyl groups, c) 1.5 to 19% by weight of a component c), wherein the component c) comprises at least one component c1) that, on account of (potentially) ionic groups in the structure thereof, has a hydrophilizing action and has at least one further isocyanate-reactive group, and at least one component c2) that has groups having a nonionically hydrophilizing action and contains at least one further isocyanate-reactive group, d) 0.1 to 10% by weight of one or more di- and/or polyfunctional amines or hydroxyamines as chain extenders, and e) optionally other monomeric, oligomeric and/or polymeric substances, which may optionally also have further unsaturated groups, selected from low-molecular-weight diols and/or polymer diols or epoxy acrylates, ester acrylates, polyester acrylates and/or products of the reaction of monoepoxides with unsaturated fatty acids, wherein the stated percentages for a) to d) add up to 100% and the ratio of the equivalents of isocyanate groups in component a) to the sum of the equivalents of isocyanate-reactive hydroxy and/or amino groups in components b), c) and optionally e) is between 0.95:1 and 1.39:1, and wherein the UV-curable polyisocyanate-based dispersions, in consequence of the incorporation of component c), have acid values of 0 to 26 mg KOH/g of substance based on the solids content, the content of urethane groups is in the range from 8 to 30% by weight based on the solids content and the UV-curable polyisocyanate-based dispersions contain less than 5% by weight of organic solvents.