Coating compsn. hardenable by high energy radiation - prepd. from di:alkanolamine-epoxide resin addn. prod. and isocyanate precursor

摘要

Coating compsn. hardenable by high energy radiation is based on prod. of reaction between (A) prod. of addn. of an epoxide resin contg. >=2 epoxide radicals per mol. and having an epoxide equiv. of 100-1000 with equimolar amts. (based on the epoxide radicals) of a dialkanolamine, and (B) an unsatd. isocyanate precursor which is a prod. of reaction of equimolar amts. of an aromatic or (cyclo)aliphatic diisocyanate and a hydroxyalkyl and/or hydroxyalkoxyalkyl (meth)acrylate. The amt. of isocyanate precursor, contg. on average one free isocyanate radical per mol. is such that the prod. contains 1-3 terminal double bonds per 100 mol. wt. units. Coating compsn. shows exceptional adherence to wood, metal or synthetic resin substrates, high reactivity and high flexibility, and good surface hardness.