Patent ID: 8362101

Claim:
A multifunctional Type II photoinitiator according to Formula (I): wherein X represents a structural moiety according to Formula (II): wherein: A represents a Norrish Type II initiating group; L represents a divalent linking group positioning the Norrish Type II initiating group A and the CR2R3-group in a 1-5 to a 1-9 position wherein position 1 is defined as the first atom in the aromatic or alicyclic ring of A to which L is covalently bonded and the position 5 to 9 is defined as the carbon atom of the CR2R3-group to which L is covalently bonded, with the proviso that L does not contain an amine; R1 represents an optionally substituted group selected from the group consisting of an alkyl group, an alkynyl group, an aralkyl group, an alkaryl group, an aryl group, and a heteroaryl group; R2 to R6 each independently represent a hydrogen or an optionally substituted group selected from the group consisting of an alkyl group, an alkenyl group, an alkynyl group, an aralkyl group, an alkaryl group, an aryl group, and a heteroaryl group, with the proviso that at least one of R2 to R6 represents a hydrogen; any two or three groups of the group selected from R1 to R6 and L may represent the necessary atoms to form a five to eight membered ring, and with the proviso that L is not substituted with a (meth)acrylate group and that none of R1 to R6 is substituted with an ethylenically unsaturated polymerizable group; Q represents an n-valent linking group having a number average molecular weight of at most 5,000; Q is bonded to each of the moieties X via a single bond to a group selected from R1 to R6, L, and A; and n represents an integer from 2 to 8.