ULTRAVIOLET RADIATION-CURABLE EPOXY SILICONES/POLYOL SYSTEMS

摘要

60SI-1267 Ultraviolet radiation-curable coating compositions are described which comprise: (A) an epoxyfunctional diorganopolysiloxane having the general formula R2R'SiO(RR'SiO)xSiR2R', where each R individually is an alkyl group having from 1 to 8 carbon atoms, each R' individually is R or a monovalent epoxyfunctional organic radical having from 2 to 20 carbon atoms with the proviso that at least 2 R' radicals are monovalent epoxyfunctional organic radicals and x has a value from 0 to 20; (B) a compound having at least one alcoholic or phenolic hydroxyl group in an amount providing not more than about 1.5 hydroxyl group per epoxy group of the diorganopolysiloxane, and (C) a catalytic amount of a photocatalyst or a combination of photocatalysts.