Patent ID: 6863929
Filing Date: 2005-03-08
Classification: B05D,C08G,C09D

Abstract:
1. A method for forming a coated film comprising the steps of sequentially applying an intermediate coating material, a base coating material and a clear coating material on a substrate on which an electrodeposition coated film has been formed; and simultaneously curing the applied three layers by baking, wherein the intermediate coating material comprises: (a) 40 to 56% by weight of an urethane modified polyester resin having a number average molecular weight of 1,500 to 3,000, the urethane modified polyester resin being obtained by polyaddition of: a hydroxyl group containing polyester resin having a glass transition point (Tg) of 40 to 80° C. which is obtained by polycondensation of an acid ingredient including not less than 80% by mole of isophthalic acid with a polyhydric alcohol ingredient, with an aliphatic diisocyanate compound; (b) 10 to 30% by weight of a melamine resin; (c) 15 to 30% by weight of a blocked isocyanate compound, the blocked isocyanate compound being obtained by blocking hexamethylene diisocyanate or an isocyanate compound derived from hexamethylene diisocyanate, with a compound having an active methylene group; (d) 4 to 15% by weight of a nonaqueous dispersion resin having core-shell stmcture, provided that percentages of (a) to (d) are based on the solid weight of coating material resin in the intermediate coating material; and (e) 0.4 to 2 parts by weight of a flake-like pigment having a longitudinal size of 1 to 10 μm and a number average particle size of 2 to 6 μm, provided that the solid weight of the coating material resin in the intermediate coating material is regarded as 100 parts.