Patent ID: 8231976

Claim:
Coating systems based on radiation-curing, aqueous polyurethane dispersions comprising I) polyurethanes obtained from A) 40% to 80% by weight of a hydroxyl-containing component comprising A1) 10% to 80% by weight, based on the sum of components (A) to (F) and (II), of one or more hydroxyl-containing prepolymers selected from the group consisting of polyester (meth)acrylates or polyether (meth)acrylates having an OH number of from 5 to 300 mg KOH/g solids and comprising groups which, on exposure to high-energy radiation, undergo polymerization reaction with ethylenically unsaturated double bonds, A2) 0% to 50% by weight, based on the sum of components (A) to (F) and (II), of one or more monomeric alcohols containing (meth)acrylate groups and having an OH number of from 35 to 1000 mg KOH/g solids, B) 0.1% to 20% by weight of one or more compounds which are reactive towards isocyanate groups and contain groups which are non-ionic, ionic or capable of forming ionic groups and have a dispersing action for the polyurethane dispersion, C) 0.1% to 30% by weight of a hydroxyl- and/or amine-containing component comprising C1) 0.1% to 10% by weight, based on the sum of components (A) to (F) and (II), of hydroxyl- and/or amine-functional monomeric compounds having a functionality of 3 to 6 and a molecular weight of from 92 to 254 g/mol and/or C2) 0.1% to 20% by weight, based on the sum of components (A) to (F) and (II), of hydroxy- and/or amine-functional polyesters, C2, C3 and/or C4 polyethers and polyetheresters having a functionality of 2.3 to 4.0 and a molecular weight of from 238 to 4000 g/mol, D) 0% to 30% by weight, based on the sum of components (A) to (F) and (II), of hydroxyl-functional compounds selected from the group of monoalcohols and/or diols, each with a molecular weight in the range from 32 to 118 g/mol, polyesters, polycarbonates, C2, C3, and/or C4 polyethers, polyetheresters and polycarbonate polyesters having a functionality of 1.0 to 2.0, in each case with a molecular weight in the range from 300 to 4000 g/mol, E) 0.1% to 10% by weight, based on the sum of components (A) to (F) and (II), of monoamines, diamines and/or difunctional amino alcohols, with F) 10% to 50% by weight, based on the sum of components (A) to (F) and (II), of one or more polyisocyanates, with the proviso that the use of polyepoxy(meth)acrylates in the synthesis of (I) is excluded, and II) 0% to 40% by weight of oligo(meth)acrylates selected from the group of component (A1) with a double bond density of more than 2.0 mol of double bonds/kg of solids and, on exposure to high-energy radiation, undergoing polymerization reaction with ethylenically unsaturated compounds, the fractions of components (A) to (F) and of component (II) adding up to 100% by weight, and the mixture of (I) and (II) that is present in the coating system having a weight-average molar mass MW of 50,000 to 3,000,000 g/mol.