Bis(substituted amino)sulfides as reversible inhibitor sources for photopolymerization

Claim 1

A photopolymerizable coating composition containing a sufficient amount of photoactive components to effect photopolymerization of the composition, said photoactive components consisting essentially of (a) at least one normally nongaseous, ethylenically unsaturated compound capable of addition polymerization by free-radical initiated chain propagation, (b) 0.001 to 10 parts by weight, per part of ethylenically unsaturated compound, of an organic, radiation-sensitive, free-radical generating system, and (c) 0.01 to 5% by weight, based on the total composition, of bis(substituted amino) sulfide of the formula ##STR6## where x is an integer from 1 to 4 and R and R', alike or different, are hydrocarbyl radicals of 1-12 carbons which are free of ethylenic unsaturation, or R and R' are joined together to form a divalent group selected from the group consisting of saturated aliphatic hydrocarbyl chains of 3 to 10 carbons containing at least 3 backbone carbons, saturated aliphatic chains of 4 to 9 carbons having an ether oxygen not attached to the carbon alpha to the nitrogen, and saturated aliphatic chains of 4 to 9 carbons having a carbonyl oxygen not attached to the carbon alpha to the nitrogen.