Visible photosensitizers for photopolymerizable compositions

摘要

Photopolymerizable compositions containing photoinitiator systems that absorb in the visible are disclosed. The photopolymerizable compositions contain at least one ethylenically unsaturated monomer capable of free radical initiated addition polymerization and a photoinitiator system capable of being activated by actinic radiation. The photoinitiator system comprises a hexaarylbisimidazole, a chain transfer agent, and a sensitizer given by the formulae A or B wherein X and R1-R13 are as defined herein. A B