Patent ID: 7816420

Claim:
A radiation curable powder coating composition, comprising as a binder a mixture of 30 to 90 weight % of one or more (meth)acryloyl group containing amorphous polyester resins having an unsaturated equivalent weight of more than 700 g/double bond and an isophthalic acid content of from 65 to 100 weight %, calculated on all the acids, and 10 to 70 weight % of one or more (meth)acryloyl group containing acrylic copolymers having an unsaturated equivalent weight of up to 1250 g/double bond, based on the total weight of the binder, wherein the (meth)acryloyl group containing amorphous polyester resins are obtained from the corresponding carboxyl group containing polyester, which is the reaction product of an acid constituent which contains from 65 to 100 mole percentage of isophthalic acid and of a glycol constituent which contains from 20 to 100 mole percentage of neopentyl glycol, wherein the (meth)acryloyl group containing acrylic copolymers are obtained from the corresponding carboxyl group containing acrylic copolymers, and wherein the carboxylic group containing polyester is in admixture with the carboxylic group containing acrylic copolymer, and the admixture is further reacted with a monomer having a (meth)acryloyl group and an epoxy functional group.