| 摘要 |
<p>Preparing low-viscosity, water-dilutable polyurethane(meth)acrylate, comprises reacting (a) at least one oligomeric polyisocyanate having average of at least 3 isocyanate groups, (c) at least one polyoxyalkylene mono-ol, (d) at least one hydroxyalkyl(meth)acrylate and (e) at least one polyoxyalkylene polyol based on starter molecule which has at least 3 hydroxy functions and is partially reacted by esterification with (meth)acrylic acid, so that on average 0.2-1.5 hydroxy functions still remain, where the polyurethane(meth)acrylate has an isocyanate content of less than 0.5 wt.%. Independent claims are also included for: (1) the polyurethane(meth)acrylate; and (2) a coating composition comprising (a1) at least one urethane(meth)acrylate, optionally (b1) a compound which differs from (a1) and contains groups which react by polymerization, with ethylenically unsaturated compounds under the action of actinic radiation, (c1) optionally an aqueous binder which is not radiation curable, (d1) an initiator, (e1) optionally water and/or a solvent, and (f1) optionally an auxiliary substance and/or additive.</p> |
