Verfahren zur Herstellung von niedrigviskosen Allophanaten mit aktinisch härtbaren Gruppen

摘要

Preparing radiation hardening allophanate with residual monomer content of less than 0.5 wt.% and an isocyanate (NCO) content of less than 1 wt.%, comprises reacting NCO group containing compound, hydroxy functional compounds exhibiting polymerization reactive groups (radiation group), under the action of actinic radiation with unsaturated ethylene compounds, optionally another compound with NCO reactive group, optionally a catalyst of NCO-group containing urethane, zinc octoate, and tertiary amine. Preparing radiation hardening allophanate with residual monomer content of less than 0.5 wt.% and an isocyanate (NCO) content of less than 1 wt.%, comprises reacting NCO group containing compound, hydroxy functional compounds exhibiting polymerization reactive groups (radiation group), under the action of actinic radiation with unsaturated ethylene compounds, optionally another compound with NCO reactive group, optionally a catalyst of NCO-group containing urethane, which is formed with radiation hardening groups and additionally isocyanate group containing compound, zinc octoate, and tertiary amine, where the ratio of NCO-group of compound from isocyanate group containing compound to the hydroxy group of the compound from hydroxy functional compound and optionally another compound with NCO-reactive group is 1.45:1 to 1.1:1. Independent claims are included for: (1) the radiation allophanate obtained by the above process; (2) a coating comprising the radiation allophanate, optionally one or more polyisocyanate with free or blocked isocyanate group, which are free of groups reacting under the effect of actinic radiation with unsaturated ethylene compound, optionally an isocyanate group containing compound exhibiting polymerization reactive group, under effect of actinic radiation with unsaturated ethylene compound, optionally free or blocked NCO group, optionally one or more isocyanate reactive group and active hydrogen containing compound, initiators, optionally solvents and optionally auxiliaries and additives; and (3) substrates coated with coatings obtained using the radiation allophanate.