Progress in Cationic Chemistry: Colored UV-curable Powder Coatings

Clear and pigmented IR I UV curable powder systems based on the photo-induced cationic polymerization of solid, bisphenol-A based epoxy resins in the presence of a chain transfer agent have been developed. By extruding the solid resins on standard equipment with pigments and a recently developed co-initiator, it is now possible to coat temperature sensitive substrates like wood and metals with colored formulation. This new approach allows to obtain in particular opaque yellow and gray shaded coatings with good flow and excellent mechanical properties on wood and metal substrates.