Patent Number: 6,762,248

Title: Suspension polymerizing epoxy group-containing acrylic resin

Abstract: An epoxy group-containing acrylic resin for a powder coating is prepared by suspension polymerization at a temperature of at least 80.degree. C. and a pressure of at least 2 kg/cm.sup.2 with a vinyl monomer mixture comprising from 10-60% by weight of epoxy group-containing vinyl monomers, from 10-60% by weight of alkyl (meth)acrylate(s), and other vinyl monomer(s). The epoxy group-containing acrylic resin particles possess the following characteristics: i) a weight average molecular weight of from 3000-20,000; ii) an epoxy equivalent of from 350-1200 g/eq; iii) 1000 ppm or less of volatile components; iv) a mean particle diameter of from 80-800 .mu.m; v) at least 95% by weight of the particles having a long diameter R:short diameter r ratio within the parameters 1<R/r<1.2; and vi) 5% by weight or less of the particles having a long diameter R of less than 62 .mu.m and 5% by weight or less of particles having a short diameter r of more than 1000 .mu.m.

Inventors: Harada; Yoko (Aichi, JP), Inagaki; Motoshi (Aichi, JP), Shimizu; Koji (Aichi, JP), Tajiri; Noriyuki (Aichi, JP)

Assignee: Mitsubishi Rayon Co., Ltd.

International Classification: C08F 2/20 (20060101); C08F 120/32 (20060101); C08F 124/00 (20060101); C08F 120/00 (20060101); C08F 224/00 (20060101); C08F 2/12 (20060101); C08F 2/18 (20060101); C08F 2/00 (20060101); C08L 33/00 (20060101); C08L 33/14 (20060101); C08F 002/18 (); C08F 002/20 (); C08F 120/32 (); C08L 033/14 ()

Expiration Date: 07/12016