Actinic radiation-curable formulations containing at least one unsaturated polyether-esterurethane oligomer

Claim 1

A coating composition comprising (a) at least one unsaturated resin comprising the reaction product of (i) at least one organic isocyanate compound having at least two isocyanate groups; (ii) at least one polyetherester polyol having at least two hydroxy groups and having the residue of at least one poly(alkylene oxide) polyol integrated into the backbone chain of such polyetherester polyol; and (iii) at least one unsaturated addition-polymerizable monomeric compound having a single isocyanate-functional active hydrogen group; there being present an excess of isocyanate compound with respect to the hydroxy groups of said polyetherester polyol; said unsaturated addition-polymerizable monomeric compound having a single isocyanate-reactive hydrogen group being present in an amount sufficient to provide at least one molar equivalent of active hydrogen group with respect to isocyanate reactivity; (b) a reactive diluent system comprising at least one unsaturated addition-polymerizable monomeric compound which is copolymerizable with said unsaturated urethane resin; the amount of unsaturated urethane resin being in the range from about 30 to about 90 weight percent, based on total weight of unsaturated urethane resin and reactive diluent systems; and (c) a photocatalyst system selected from the group consisting of (i) at least one compound which promotes free radical addition polymerization through bimolecular photochemical reactions of the energy donor or energy transfer type, of the hydrogen abstraction type, or by the formation of a donor-acceptor complex with monomers or additives leading to ionic or radical species; and (ii) at least one compound which promotes free radical addition polymerization through bimolecular photochemical reactions of the energy donor or energy transfer type, of the hydrogen abstraction type, or by the formation of a donor-acceptor complex with monomers or additives leading to ionic or radical species in association with at least one compound which promotes free radical addition polymerization by generating reactive specie by way of unimolecular homolysis.