| abstract |
Process for the preparation of storage-stable urethane acrylics from cycloaliphatic diisocyanates, in particular isophorone diisocyanate, hydroxyalkyl acrylates and bi-, tri- and / or tetrafunctional saturated and / or unsaturated polyols in the presence of reactive diluents and organic tin catalysts in two stages, in whichn n n in the first stage, diisocyanate is reacted with hydroxyalkyl acrylates in the equivalent ratio NCO: OH of 1: in the temperature range from 0-50 ° C. andn n n in the second stage, the reaction of the NCO-containing acrylic urethane formed in the first stage with polyfunctional polyols or their mixtures in the NCO: OH equivalent ratio of 1: 1 in the temperature range from z. B. 70 ° C, with organic tin catalysts to practically NCO-free urethane acrylics. |