Patent ID: 9567485
Date: 2017-02-14
CPC Classifications: B05D,C08G,C09D,Y10T

Claim:
1. A coating method comprising applying an aqueous base coat paint, without hardening the aqueous base coat paint by cross-linking, subsequently coating a clear coat paint comprising a hardener and an active hydrogen-containing resin on the base coat paint, hardening the base coat paint and the clear coat paint simultaneously by cross-linking, wherein the clear coat paint is a two-component polyurethane paint with a mole ratio of 0.9 to 2.0 in NCO/H (active hydrogen), wherein (1) the hardener comprises a reaction product of (i) a derivative of 1,6-hexamethylene diisocyanate comprising a trimer, wherein the amount of trimers of 1,6-hexamethylene diisocyanate in the derivative of 1,6-hexamethylene diisocyanate is 55 weight % or more and wherein the amount of diisocyanate monomers included in the derivative of 1,6-hexamethylene diisocyanate is 1 weight % or less, and (ii) a compound having both an active hydrogen and a hydrophilic group; and (2) viscosity of the hardener when it is not diluted with any organic solvent is not more than 1,000 mPa·s/23° C.