Patent ID: 8007582

Claim:
A UV-curable powder coating composition comprising an amorphous (meth)acrylate terminated poly(ester-urethane) comprising the reaction product of: (A) an amorphous polyester polyol having an OH number of greater than 160 mg KOH/g, the amorphous polyester polyol being prepared by polycondensation of (i) a polycarboxylic acid or acid anhydride thereof; and (ii) a polyol, the polyol comprising a mixture of a polyol having hydroxyl functionality of three or greater and a diol, wherein the weight ratio of the polyol having hydroxyl functionality of three or greater to diol is from 0.5 to 1.0:1, and (B) an adduct of polyisocyanate and a hydroxyl functional (meth)acrylate, the adduct being monofunctional with respect to isocyanate; in which the difference in the melt viscosity of the amorphous (meth)acrylate terminated poly(ester-urethane) measured at temperatures of 125° C. and 150° C. is no greater than 20,000 cps.