Method for producing low viscosity allophanates with actinically hardenable groups

摘要

Producing radiation hardened allophanate, comprises producing isocyanate (NCO) group containing urethane with radiation hardened group from (a) NCO group containing compounds, (b) a mixture containing hydroxy-ethyl acrylate and hydroxy propyl acrylate, (c) optional further non-radiation hardening compound with NCO-reactive groups, (d) optionally in the presence of a catalyst and reacting the NCO-group containing urethane with radiation hardened group without further addition of NCO group containing compounds in the presence of (e) an allophanating catalyst and (f) optionally a tertiary amines. Producing radiation hardened allophanate with a residual monomer content of less than 0.5 wt.% and an isocyanate content of less than 1 wt.%, comprises producing isocyanate (NCO) group containing urethane with radiation hardened group from (a) NCO group containing compounds, (b) a mixture containing at least 90 mol.% of hydroxy-ethyl acrylate and hydroxy-propyl acrylate, where the mixture contains 10-45 mol.% of hydroxy-ethyl acrylate, (c) optionally a further non-radiation hardening compound with NCO-reactive groups, (d) optionally in the presence of a catalyst and reacting the isocyanate-group containing urethane with radiation hardening group without further addition of isocyanate groups containing compounds in the presence of (e) an allophanating catalyst and (f) optionally a tertiary amines, where the ratio of isocyanate groups of the compounds from (a) to the hydroxyl groups of the compounds from (b) and optionally (c) amounts to 1.45:1 to 1:1. Independent claims are included for: (1) the radiation hardening allophanate obtained by the process; (2) a coating agent comprises: one or more radiation hardened allophanate; optionally one or more polyisocyanate with free or blocked isocyanate group, which are free of groups reacting under actinic radiation effect with ethylenically unsaturated compound under polymerization; optionally further different compounds of the radiation hardening allophanate, where the groups of the different compounds reacting under actinic radiation effect with ethylenically unsaturated compound under polymerization and optionally contains free or blocked NCO-groups; optionally one or more active hydrogen(s) reacting with isocyanate containing compound; initiator; optionally solvent and optionally auxiliary materials and additives; and (3) a substance coated with the coating obtained under the use of radiation hardened allophanate.