Producción de nuevos agentes aglutinantes que se endurecen por radiaciones

摘要

A binder is prepared by reacting at temperatures below 130[deg]C: NCO-functional compound(s) containing uretdione groups; with compound(s) bearing isocyanate reactive groups and groups that react with ethylenically unsaturated compounds with polymerization on exposure to actinic radiation; and then with other saturated, hydroxyl-containing compound(s); in the presence of a catalyst. Preparation of a binder containing allophanate groups, groups that react with ethylenically unsaturated compounds with polymerization on exposure to actinic radiation (radiation-curing groups) and optionally NCO-reactive groups, comprises reacting at temperatures below 130[deg]C: (a) NCO-functional compound(s) bearing uretdione groups; with (b) compound(s) having both isocyanate reactive groups and groups that react with ethylenically unsaturated compounds with polymerization on exposure to actinic radiation (radiation-curing groups); and then with (c) saturated, hydroxyl-containing compound(s) other than (b), at least one of these compounds having an hydroxyl functionality greater than 2 (the reaction with such compounds taking place at least proportionally with the formation of allophanate groups); in the presence of (d) a catalyst containing ammonium salt(s) or phosphonium salt(s) of aliphatic or cycloaliphatic carboxylic acids. Independent claims are also included for: (1) a binder prepared by the inventive process; and (2) a coating composition comprising: (A) binder(s); (B) optionally polyisocyanate(s) containing free or blocked isocyanate groups and optionally containing groups which react with ethylenically unsaturated compounds with polymerization on exposure to actinic radiation; (C) optionally compounds other than (A) bearing groups which react with ethylenically unsaturated compounds with polymerization on exposure to actinic radiation and optionally having NCO-reactive groups; (D) optionally isocyanate-reactive compound(s) free from groups which react with ethylenically unsaturated compounds with polymerization on exposure to actinic radiation; and (E) initiator(s); and (3) a substrate coated with a coating obtained from the radiation-curing binder containing allophanate groups (1).