Patent ID: 7553879

Claim:
A UV radiation curable primer coating composition comprising: (a) one or more compounds containing one ethylenically unsaturated free-radically polymerizable group per molecule; (b) 5 to 50% by weight of compounds containing two or more ethylenically unsaturated free radically polymerizable groups per molecule comprising a difunctional urethane acrylate and a hexafunctional urethane acrylate; (c) 1.0 to 60% by weight of one or more pigments, fillers and/or dyes; (d) 0.1 to 0.95 % photoinitiators; (e) 0 to 20% by weight of volatile organic solvent; and (f) 0.1 to 10% by weight of additives, wherein said coating composition is curable to a non-tacky surface under a UVA radiation emitting lamp within 2 minutes and in sunlight within 5 minutes.