Patent ID: 8470405
Filing Date: 2013-06-25
Classification: B05D

Abstract:
1. A method of forming a multi-layer paint film, comprising painting an aqueous first base-paint on a base material on which an electro-deposition paint has been coated in order to form a first base-paint layer, painting an aqueous second base-paint on said first base-paint layer as a wet-on-wet system in order to form a second base-paint layer, painting a clear-paint on the second base-paint layer as a wet-on-wet system in order to form a clear-paint layer, and baking the three paint layers at the same time, wherein the aqueous first base-paint comprises a hydroxyl group containing non-ionic resin and a crosslinking agent, wherein the hydroxyl group containing non-ionic resin comprises at least one of ethylene oxide units, propylene oxide units, and the combination thereof, in an amount of from 4 to 15 mass % in the hydroxyl group containing non-ionic resin and has a resin acid value of less than 15 mgKOH/g and a hydroxyl group value of from 10 to 100 mgKOH/g.