Radiation-curing, water-dispersible polyurethane (meth)acrylates

A urethane (meth)acrylate (A) comprising a reaction product of:

• (a) at least one (cyclo)aliphatic di- and/or polyisocyanate,
• (b1) at least one (cyclo)aliphatic diol having a molar mass of less than 700 g/mol,
• (b2) at least one polyesterdiol having a weight-average molar mass Mw of 700 to 2000 and optionally an acid number to DIN 53240 of not more than 20 mg KOH/g,
• (c) at least one compound (c) having at least one isocyanate-reactive group and at least one radically polymerizable unsaturated group,
• (d) at least one compound which has at least one isocyanate-reactive group and at least one acid group,
• (e) at least one base for at least partial neutralization of at least one acid group of component (d), being different from components (h1) and (h2),
• (f) optionally at least one monoalcohol, having precisely one hydroxyl function,
• (g) optionally at least one monofunctional polyalkylene oxide polyether alcohol,
• (h1) at least one monoamine which is substituted by one or two hydrocarbon radicals, in which the one or two hydrocarbon radicals together have at least 12 carbon atoms, and
• (h2) optionally at least one compound having at least two primary and/or secondary amino groups,
• wherein the urethane (meth)acrylate (A) is obtained by a process comprising reacting at least a portion of components (b1), (b2), and (c) with component (a).