Method of Forming a Brilliant Multi-Layered Coating Film
AssigneeKansai Paint Co., Ltd.
InventorsHironori Tonomura, Yoshizumi Matsuno, Yasushi Nakao
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Abstract
This invention provides a method for forming brilliant multi-layered coating film excelling in brilliance, which comprises the steps of applying an effect pigment-containing water-borne base coating composition (A1) having a coating film viscosity (VA1) after 1 minute of its application of 10-500 Pa·sec onto a substrate to form a first base coating film; and applying an effect pigment-containing water-borne base coating composition (A2) having a coating film viscosity (VA2) after 1 minute of its application of 5-200 Pa·sec onto the first base coating film while the viscosity (VA3) of the first base coating film is 10-500 Pa sec, the viscosity ratio (VA1)/(VA2) being 1.3/1-35/1.
Claims23
A method for forming brilliant multi-layered coating film, which comprises the steps of
- (1) applying an effect pigment-containing water-borne base coating composition (A1) onto a substrate to form a first base coating film,
- (2) applying an effect pigment-containing water-borne base coating composition (A2) onto the uncured first base coating film to form a second base coating film, and
- (3) heat-curing the two coating films, the method being characterized in that
- (i) the effect pigment-containing, water-borne base coating composition (A1) has a viscosity (VA1), as measured under the conditions of shear rate of 0.1 sec−1 and 23° C. in temperature, at one minute after its application, within a range of 10-500 Pa·sec;
- (ii) the effect pigment-containing water-borne base coating composition (A2) has a viscosity (VA2), as measured under the conditions of shear rate of 0.1 sec−1 and 23° C. in temperature, at one minute after its application, within a range of 5-200 Pa·sec;
- (iii) the ratio between the viscosities, (VA1)/(VA2), lies within a range of 1.3/1-35/1;
- and
- (iv) the effect pigment-containing water-borne base coating composition (A2) is applied while the viscosity (VA3) of the first base coating film, as measured under the conditions of shear rate of 0.1 sec−1 and 23° C. in temperature, is within a rang of 10-500 Pa·sec.
Dependencies are inferred from the claim text.