Near UV–visible light induced cationic photopolymerization reactions: A three component photoinitiating system based on acridinedione/silane/iodonium salt

Acridinediones (AD) are attractive dyes exhibiting a strong absorption at about 400 nm. When used in the presence of a silane and an iodonium salt, they efficiently initiate the free radical promoted cationic photopolymerization of an epoxide under air and upon a xenon lamp, a laser diode or sunlight exposure. The mechanism analyzed by ESR and laser flash photolysis is discussed and opens a new way for the design of such three-component systems.

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