Patent ID: 6509420
Filing Date: 2003-01-21
Classification: C09D,Y10S

Abstract:
A powder coating composition comprising an epoxy group-containing acrylic resin particles and a curing agent, said curing agent contained to cure the epoxy group-containing acrylic resin particles and form a coating on a substrate, said epoxy group-containing acrylic resin particles(i) being a copolymer, having a weight-average molecular weight of 3000 to 20000, of a vinyl monomer mixture comprising 10 to 60% by weight of alkyl ester(s) of (meth)acrylic acid, 10 to 60% by weight of epoxy group-containing vinyl monomer(s) and other vinyl monomer(s), (ii) having a mean particle diameter in the range of 80 to 800 &mgr;m, (iii) including 95% by weight or more of particles satisfying the relation of 1&lE;R/r&lE;1.2 wherein R is a long diameter and r is a short diameter of each particle, (iv) comprising 5% by weight or less of particles having long diameters R of less than 62 &mgr;m and 5% by weight or less of particles having short diameters r of more than 1000 &mgr;m, (v) including 1000 ppm or less of volatile components, and (vi) having an epoxy equivalent in the range of 350 to 1200 g/eq.