Time Resolved Nuable Laser Spectroscopy of a Multicomponent Photoinitiating System

A new three-component photoinitiating system (based on isopropyithioxanthone ITX, amine AH and abifunctional benzophenone - ketosulfone BP-SK photoinitiator) for acrylate polymerizationreactions was investigated through time resolved laser spectroscopy. Addition of ITX to BP-SK I AH clearly enhances the efficiency of the photopolymerization of clear or pigmented coatings. This is mostly explained on the basis of the interaction of BP-SK with the ketyl radical of ITX.