Patent ID: 8748503

Claim:
A macro-photoinitiator comprising a polymer chain structure represented by the following general formula (I), Φ-[[-(M) p -] x -Y-L-PI] z (I) wherein, Φ is a residue of a polymerization initiator, M is a residue of at least one ethylenically unsaturated radically polymerizable monomer, p represents an average number of monomer residues occurring in a block of monomer residues, p, x, and z are each individually selected such that said macro-photoinitiator has a number average molecular weight of at least 400, p is, independently for each x, an integer from 1 to 5000, x is, independently for each z, an integer from 1 to 20, z is at least 1, Y, independently for each z, is selected from S and O, L, independently for each z, is a bond or a divalent linking group comprising at least one divalent moiety selected from the group consisting of divalent organic moieties, divalent inorganic moieties, and combinations thereof, and PI, independently for each z, represents a photoinitiator residue, wherein said photoinitiator residue is selected from the group consisting of triazine residues, fluorenone residues, and residues represented by the following general formula (II), wherein, R is aryl, aryl substituted with at least one substituent selected from the group consisting of C 1 -C 20 alkyl, halogen and combinations thereof, C 3 -C 12 cycloalkyl or —CR 1 R 2 R 3 , wherein R 1 , R 2 and R 3 are each individually selected from the group consisting of hydrogen, hydroxyl, aryl, aryl substituted with at least one substituent selected from the group consisting of C 1 -C 20 alkyl, halogen, and combinations thereof, C 1 -C 20 hydroxylalkyl, C 1 -C 20 alkoxy, C 3 -C 12 cycloalkyl, and —C(O)—R 5 , wherein R 5 is aryl or aryl substituted with at least one substituent selected from the group consisting of C 1 -C 20 alkyl, halogen and combinations thereof, and R 4 in each instance is independently selected from the group consisting of hydrogen, halogen, linear, or branched C 1 -C 20 alkyl, C 3 -C 12 cycloalkyl, and aryl.