Patent ID: 6551708
Filing Date: 2003-04-22
Classification: C08F,C08L,C09D,Y10S,Y10T

Abstract:
A powder coating composition comprising a powder and a pigment, wherein said powder contains a vinylidene fluoride copolymer having a melting point of not higher than 150Â° C. and a weight average molecular weight of 1Ã—104 to 5Ã—105 and a methyl methacrylate copolymer having a glass transition temperature of not higher than 110Â° C. and a weight average molecular weight of 1Ã—104 to 5Ã—105; a number average particle size of particles constituting the powder being from 1 to 100 &mgr;m and an apparent density of the powder being from 0.2 to 1 g/ml, and wherein the vinylidene fluoride copolymer comprises an amount of vinylidene fluoride monomer of from 60 to 80 mol. %, and said powder is a powder obtained by emulsion-seed-polymerizing 10 to 400 parts by weight of a monomer mixture comprising methyl methacrylate and a monomer copolymerizable with methyl methacrylate in an aqueous dispersion containing 100 parts by weight of particles of the emulsion-polymerized vinylidene fluoride copolymer.