| 摘要 |
A process for producing coatings, in which (I) coating materials are applied to substrates or to uncured, part-cured and/or fully cured coating films present on said substrates, and (II) the resulting films of the coating materials are cured thermally and with actinic radiation, alone or together with the coating films, which involves (1) conducting the actinic radiation cure under an oxygen-depleted atmosphere and (2) the coating materials comprising (A) meth(acrylate) copolymers which have an OH number of from 100 to 220 mg KOH/G, a glass transition temperature of -35 to +60° C., a number-average molecular weight of from 1 000 to 10 000 daltons and a mass-average molecular weight of from 2 000 to 40 000 daltons and which contain in copolymerized form an amount of hydroxyl-containing monomers (a) that corresponds to the OH number, of which (a1) from 20 to 90% by weight are based on (a), 4-hydroxybutyl (meth)acrylate and/or 2-alkylpropane-1,3-diol mono-(meth)acrylate, and (a2) from 10 to 80% by weight are based on (a), other hydroxyl-containing olefinically unsaturated monomers; and (B) from 0.2 to 8% by weight of photoinitiators.
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