Aqueous UV-hardenable dispersions are provided, as well as their use for the production of
coating agents, in particular coatings for ligneous substrates. The dispersions comprise the
reaction product of a) one or more polyisocyanates of which at least one polyisocyanate is an oligomeric polyisocyanate of
hexamethylene diisocyanate with urethane, biuret, iminooxadiazindione and / or isocyanurate structural units, b) one or more monohydroxy-functional compounds containing (
meth)acryloyl groups, c) at least one component c1), which has a hydrophilising effect on the basis of incorporated (potentially) ionic groups and comprises at least one further
isocyanate-reactive group and / or at least one component c2) which contains non-ionically hydrophilically acting groups and comprises at least one further
isocyanate-reactive group, d) one or more difunctional and / or polyfunctional amines or hydroxyamines as chain
extender, and e) optionally other monomeric, oligomeric and / or polymeric substances, which may optionally also contain further unsaturated groups.