| abstract |
The present invention relates to radiation-curable coating compositions based on tin-free aqueous polyurethane dispersions based on polyurethane acrylates (i), characterized in that the polyurethane acrylate (i) comprises as builder components A) one or more compounds with at least one group which is reactive towards isocyanate and at least one unsaturated group which can undergo free radical polymerization, B) one or more compounds which differ from A) and have at least one group which is reactive towards isocyanate, C) one or more compounds with at least one group which is reactive towards isocyanate and additionally at least one group having a hydrophilizing action, D) one or more organic polyisocyanates, which are reacted in the presence of F) bismuth(III) salt(s) and G) an acid having a pKa of < 2.5, and a process for the preparation thereof, the use of the coating compositions as lacquers and / or adhesives, and objects and substrates provided with these lacquers and / or adhesives. |