Patent ID: 8580382

Claim:
A coated metal pigment for an aqueous coating which comprises: a metal pigment having an average major axis of from 1 to 100 μm and a composite coating layer, wherein the material of said metal pigment is aluminum or its alloy, iron or its alloy, copper or its alloy, or material prepared by coating metal or an alloy on glass flakes, and said composite coating layer comprises an adhesion layer which is disposed on the surface of said metal pigment either in contact with said metal pigment or with another layer disposed between said metal pigment and said adhesion layer and contains polysiloxane and/or silica, and a resin layer which is disposed on the surface of said adhesion layer with a coupling agent layer disposed between said adhesion layer and said resin layer and comprising a silane coupling agent having a hydrophobic group or a silylation coupling agent having a hydrophobic group, both the silane coupling agent and the silylation coupling agent being free of a polymerizable double bond, wherein said resin layer is a copolymer obtained by copolymerization of at least three kinds of monomers including a reactive monomer having a carboxyl group and/or a phosphoric acid group, a polyfunctional acrylic ester monomer with three or more functionalities, and a polymerizable monomer having a benzene nucleus, and wherein said copolymerization is solution polymerization.