Patent ID: 8758896
Filing Date: 2014-06-24
Classification: B05D,C08F,C08G,C08L,C09D,Y10T

Abstract:
1. A method for forming a multilayer coating film by sequentially performing the following steps (1) to (4): (1) applying an aqueous colored coating composition (A) to a substrate to form an uncured colored coating film; (2) applying an effect pigment-containing aqueous coating composition (B) comprising a binder component (b1), an effect pigment (b2), and a hydrophobic solvent (b3) in proportions relative to 100 parts by mass of the solids content of the binder component (b1), of 15 to 30 parts by mass of effect pigment (b2) and 25 to 60 parts by mass of hydrophobic solvent (b3), to the uncured colored coating film formed in step (1), without preheating the uncured colored coating film, to form an uncured effect coating film having a film thickness of 7 to 13 μm when cured; (3) applying a clear coating composition (C) to the uncured effect coating film formed in step (2) to form an uncured clear coating film; and (4) heating the uncured colored coating film, the uncured effect coating film, and the uncured clear coating film formed respectively in steps (1) to (3) to simultaneously cure these three coating films, wherein the aqueous colored coating composition (A) comprises a binder component (a1) and a pigment (a2), wherein the binder component (a1) comprises a urethane resin emulsion (a1-1(c)) having a weight average molecular weight of 2,000 to 50,000 produced with a polyisocyanate component and a polyol component, as starting materials, wherein the polyisocyanate component comprises alicyclic diisocyanate and the polyol component comprises 50 mass % or more of polycarbonatediol relative to a total amount of the polyol component.