The role of the photoinitiating systems towards the inhibiting effect of phenolic compounds in the photopolymerization of acrylates

Photopolymerization reactions of wood coatings under UV and visible light have been carried out. The influence of model phenolic derivatives found in wood extractives on the polymerization kinetics as well as the coating properties of clear coating formulations exposed to light in laboratory and industrial type conditions has been discussed as a function of various UV/visible or visible photoinitiating systems based on ketones and dyes. The properties of suitable formulations are discussed. Several kinds of efficient photoinitiating systems are particularly investigated such as isopropylthioxanthone/amine; bis-acylphosphine oxide derivative/isopropylthioxanthone/amine and Rose Bengal/amine/additive.