Solder mask composition

Claim 1

A screen-printable photopolymerizable composition comprising from about 15 to about 85 percent by weight of an aryloxyalkyl acrylate having the general formula: ##STR2## wherein X is a methylene, an alkyl-substituted methylene group, a dialkyl-substituted methylene group, a carbonyl group, a sulfide, a sulfoxide, a sulfone, an amine, an alkyl-substituted amine, an ethylene ether, a propylene ether, a 2-hydroxypropylene ether, wherein each alkyl group may have from 1 to 8 carbon atoms, or any combination thereof; Y is ethyl, propyl, 2-hydroxypropyl, or other lower alkyl or hydroxyalkyl groups having up to 8 carbon atoms; A is an unsaturated acryloxy group having from 3 to 18 carbons, preferably acryloxy or methacryloxy; and n is 0 through 20, m is 0 or 1, and p is 0 or 1; from about 15 to about 85 percent by weight of a diacrylate diluent; an effective amount of a monofunctional monomer selected from the group consisting of styrene and its monofunctional analogs; and a free-radical generating addition polymerizing initiating system.