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Cytec patents radiation curable low gloss powder coating

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By: KERRY PIANOFORTE

Editor, Coatings World, Coatings World

Patent No. U.S. 7,816,420 B2
Cytec Surface Specialties has obtained a patent for a radiation curable powder coating composition comprised of as a binder a mixture of 30%-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%-100% weight, calculated on all the acids, and 10%-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 65-100 mole percentage of isophthalic acid and of a glycol constituent which contains from 20-100 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.

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