METHOD FOR FORMING MULTILAYER COATING FILM
First Claim
1. A method for forming a multilayer coating film, comprising subjecting a substrate to the following steps (1) to (4) in order:
- step (1);
applying an aqueous first colored coating composition (X) to form a first colored coating film,step (2);
applying an aqueous second colored coating composition (Y) to the first colored coating film formed in step (1) to form a second colored coating film,step (3);
applying a clear coating composition (Z) to the second colored coating film formed in step (2) to form a clear coating film; and
step (4);
simultaneously bake-curing the first colored coating film, the second colored coating film, and the clear coating film formed in steps (1) to (3), wherein an aqueous coating composition comprising (A) a film-forming resin and (B) a phosphoric acid compound is applied as the aqueous second colored coating composition (Y), the phosphoric acid compound being represented by the Formula;
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Abstract
The problem to be solved by the present invention is to provide a method for forming a multilayer coating film using a 3-coat 1-bake process, the method comprising sequentially applying an aqueous first colored coating composition, an aqueous second colored coating composition, and a clear coating composition to a substrate and simultaneously heat-curing the resulting three layers to form a multilayer coating film having an excellent finished appearance, such as smoothness and distinctness of image, as well as metallic feel and no metallic mottling when the composition comprises an effect pigment, and exhibiting excellent coating film performance, such as water resistance. The present invention provides a method for forming a multilayer coating film by a 3-coat 1-bake process comprising sequentially applying an aqueous first colored coating composition, an aqueous second colored coating composition, and a clear coating composition to a substrate, and simultaneously heat-curing the resulting three layers to form a multilayer coating film, wherein the aqueous second colored coating composition contains (A) a film-forming resin and (B) a phosphoric acid compound represented by a specific formula.
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Citations
13 Claims
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1. A method for forming a multilayer coating film, comprising subjecting a substrate to the following steps (1) to (4) in order:
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step (1);
applying an aqueous first colored coating composition (X) to form a first colored coating film,step (2);
applying an aqueous second colored coating composition (Y) to the first colored coating film formed in step (1) to form a second colored coating film,step (3);
applying a clear coating composition (Z) to the second colored coating film formed in step (2) to form a clear coating film; andstep (4);
simultaneously bake-curing the first colored coating film, the second colored coating film, and the clear coating film formed in steps (1) to (3), wherein an aqueous coating composition comprising (A) a film-forming resin and (B) a phosphoric acid compound is applied as the aqueous second colored coating composition (Y), the phosphoric acid compound being represented by the Formula; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification