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The move towards lower VOC emission from paint systems can be achieved by using water-based coatings. In this case film formation requires a low glass transition temperature, Tg, while most applications require a final high Tg and high solvent resistance. Light induced curing is an interesting way to overcome the contradictory demands on 1g. While a few UV systems able to cure clear latexes are known, visible light photoinitiating systems are required for the curing of outdoor/indoor pigmented coatings. In the present work, a photocurable latex formulation, sensitive to visible light, has been designed. The curing process, which is not affected significantly by
oxygen, leads to paints which exhibit interesting properties: hardness up to 107, increase of Tg upto 11c.
