Alkyl phenylglyoxylates as radical photoinitiators creating negative photoimages1

Abstract

Alkyl phenylglyoxylates are shown to be efficient photoinitiators for acrylate polymerization. Benzoyl and phenyl radicals derived from intermolecular hydrogen abstraction are the initiating species. A negative photoimage system was developed based on this observation. The imaging material consists of a polymeric phenylglyoxylate initiator and to-be-crosslinked diacrylate monomers. The contrast and sensitivity of this system have been measured.