Patent ID: 6855745

Claim:
A photopolymerizable composition comprising a photopolymerizable compound having at least one ethylenically unsaturated double bond as a majority component and at least one multifunctional maleimide photoinitiator resulting from the reaction of a maleimide compound of the formula wherein (a) each R 1 and R 2 is independently selected from the group consisting of hydrogen, linear or branched C1 to C4 alkyl, and halogen; (b) R is linear or branched C1 to C10 alkylene; and (c) FG comprises a functional group selected from the group consisting of —OR 3 , —SR 3 , —Si(R 3 ) 3 , —OC(O)N(R 3 ) 2 , —OC(O)C(═CHR 3 )R 3 , —OC(O)R 3 , —C(O)R 3 , —N(R 3 ) 2 , —C(O)OR 3 , —NCO, —C(O)N(R 3 ) 2 , —OC(O)OR 3 , —CN, halogen, —CH 2 N-aryl-FG′, —CH 2 N-aryl-R 3 -FG′, sulfonic acid, quaternary ammonium, and salts thereof, in which each R 3 is selected from the group consisting of hydrogen, alkyl, aryl, cycloalkyl, arylalkyl, and alkylaryl and in which FG′ is selected from the group consisting of —OR 3 , —SR 3 , —Si(R 3 ) 3 , —OC(O)N(R 3 ) 2 , —OC(O)C(═CHR 3 )R 3 , —OC(O)R 3 , —C(O)R 3 , —N(R 3 ) 2 , —C(O)OR 3 , —NCO, —C(O)N(R 3 ) 2 , —OC(O)OR 3 , —CN, halogen, sulfonic acid, and quaternary ammonium, with a spacer group to link said maleimide unit with at least one other maleimide unit to form a multifunctional maleimide compound, wherein said composition optionally further comprises a compound to accelerate polymerization of the photopolymerizable compound by the maleimide photoinitiator.