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The penetration of energy curing technology in graphic arts is still marginal, even if it has all the characteristics to become the technique of choice, mainly for high printing speed, increasing quality, reduced VOC release. In order to improve these characteristics and to satisfy unmet needs, a continuous improvement of the components of the formulations is required. Photoinitiators are key components for the success of a formulation. Some required characteristics of photoinitiators are high reactivity in pigmented systems, good stability in the formulations, no release of odorous photodecomposition derivatives, low migration from the cured formulations. In graphic arts two main different applications have been developed: the overprint varnishes (OPV), that are mainly constituted by clear coatings and the inks, constituted by pigmented systems. The first application requires high curing speed, non-yellowing and no migratable products; the letter implies curing in presence of highly absorbing components (pigments), stable formulations, highspeed cure, no migratable components.
