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In the last few years, work in several laboratories has been directed to the preparation of novel cationic photoinitiators, onium salts. The latter include new structures, such as dialkyiphenacylsulfonium salts (1), as well as more standard onium salts, like the diaryliodonium salts recently registered and placed on the market by Ciba. All these new products aim at addressing the issues associated with the cationic photoinitiators that are currently commercially available, e.g. lack of absorption of UV energy at long wavelength, presence of heavy metal, such as antimony (Sb), generation of non-desirable volatile compounds from the photolysis reactions, excessive cost of certain structures that makes them unacceptable in a lot of coatings applications, This paper will present a series of data that show the efficiency of the recently marketed diaryliodonium salt and the influence that certain photosensitizers and free radical photoinitiators can have on its activity in cycloaliphatic-diepoxide based systems, both clear and pigmented.
