JPH1028926A - Metallic coating film structure and formation of metallic coating film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obviate the occurrence of color differences by the variations in film thicknesses by using lustrous materials and coloring pigments alone by specifying the lightness of a gray color primer coating film, the pigment volumetric concn. of the lustrous material of a metallic coating film and the light ray transmittance at a specific wavelength to specific values. SOLUTION: The lightness (L value) of the gray color primer coating film of the metallic coating film structure which is formed by laminating the low concealable metallic coating film contg. the lustrous material on the gray color primer coating film and in which the color difference is <=1.5 in a range of <=15μm in the film thickness difference of the metallic coating film is set at 35 to 90 and is set in a range within the L value + 35 of the desired metallic coating film. The metallic coating film contains the lustrous material at least at 0.1% in the pigment volumetric concn. and is a through-color having the light ray transmittance of 30 to 60% measured in the wavelength region of the metallic coating film color at a wavelength of 400 to 700nm in the dry film thickness of at least 10μm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel metallic coating structure and a method for forming a metallic coating. The present invention relates to a novel metallic coating structure and a method for forming a metallic coating film which do not cause high chroma and have excellent glitter.

[0002]

2. Description of the Related Art Conventionally, metallic coating has been widely performed. The metallic coating is usually applied with a coating thickness (dry thickness) of 15 to 25 μm in order to conceal the base, and the metallic coating is formed such that the light transmittance becomes 3% or less at this coating thickness. A brilliant material and a chromatic pigment commonly used for coloring are incorporated therein. of course,
Passenger cars, motorcycles, and the like painted with this metallic paint have no particular problem in terms of finishing, and have been well received in the market. However, in the conventional metallic coating, the content of the glittering material in the metallic paint is increased in order to conceal the base, or an inorganic pigment such as carbon black or an organic pigment having poor transparency is mixed in the metallic paint. Therefore, there is a problem in that a metallic coating film having high chroma and excellent glitter can not be obtained in a medium lightness to high lightness region, and there is a problem that the cost of the metallic paint increases.

As a method of solving the above problem, a method of using a color (co-color) base as a base coat of a metallic coating has been performed, but also has a problem that a coating cost is increased.

However, in the prior art, a low-concealing material is used for the top coat, and this is combined with a specific gray intermediate coat having an average reflectivity in the range of ± 15% when completely concealed to obtain a color difference of 0. A method of forming a two-layer coating film having a thickness of 1.5 or less has been proposed (Japanese Patent Publication No. Sho 61-101).
No. 90). However, this coating film forming method is intended for solid color coating, and is not intended for a coating system which gives a brilliant feeling such as metallic coating. There is a problem that a color difference due to variation easily occurs, and a high-saturation metallic coating film cannot be obtained.

[0005]

DISCLOSURE OF THE INVENTION The present invention relates to a metallic coating film which does not provide a uniform film thickness and causes a variation in the film thickness. It is an object to obtain a metallic coating film which can provide excellent chroma, brilliantness and color tone at medium to high brightness without using a pigment alone and which does not cause a color difference due to variation in film thickness. It is.

[0006]

The present inventors have conducted intensive studies to achieve the above object, and as a result, have found that a gray color having a specific brightness and a solid color color other than the gray color (hereinafter simply referred to as a solid color color). ) Or a specific light transmittance measured by a method described below on a silver or color metallic color undercoat film is 30 to 60%, 40 to 7 respectively.
It has been found that it can be easily achieved by laminating a metallic coating film of 0% and 60 to 90% of a sheer color, and the present invention has been completed.

That is, according to the present invention, (1) a low-concealment metallic coating containing a glittering material is laminated on a gray base coating, and the thickness difference of the metallic coating is 15 μm.
m, the color difference (ΔE) is 1.5 or less in a metallic coating structure, and the lightness (L
Value) is 35 to 90 and the L value of the desired metallic coating film +
Set to within 35, and the metallic coating contains at least 0.1% by volume of the brilliant material in pigment volume concentration;
Wavelength 400 nm to 70 with a dry film thickness of at least 10 μm
A metallic coating structure characterized in that the light transmittance measured in the wavelength range of the desired metallic coating color at 0 nm is a transparent color of 30 to 60%, and (2) a glitter on the solid color base coat A low-concealing metallic coating containing a conductive material is laminated, and the difference in thickness of the metallic coating is 1
In a metallic coating structure in which the color difference (ΔE) is 1.5 or less in a range of 5 μm or less, the lightness (L value) of the solid color base coating film is 35 to 90 and the L value of the desired metallic coating film is +35. And the metallic coating comprises a glittering material with a pigment volume concentration of at least 0.
1% and a dry film thickness of at least 10 μm and a wavelength of 40
A metallic coating structure characterized in that the light transmittance measured in a wavelength range of a desired metallic coating color at 0 nm to 700 nm is a transparent color of 40 to 70%, (3) a silver metallic color or a color metallic color base coat A low concealment top coat containing a glittering material is laminated on the film as needed, and the difference in film thickness of the low concealment top coat is 15
In a metallic coating structure in which the color difference (ΔE) is 1.5 or less in the range of μm or less, the lightness (L value) of the silver metallic or color metallic base coat is 35 to 9
0 and within the range of the L value of the desired metallic coating film within +35. Further, the low concealment top coating film contains a glittering material in a volume concentration of 0 to 2.0%, and at least 10 μm.
(4) Gray, wherein the light transmittance measured in a wavelength range of a desired metallic coating color at a wavelength of 400 nm to 700 nm at a dry film thickness of m is a transparent color of 60 to 90%. A low-concealing metallic coating containing a brilliant material is laminated on the color base coating, and the color difference (ΔE) is obtained when the thickness difference of the metallic coating is within 15 μm or less.
In which the lightness (L value) is 35 to 90 and the desired value is within a range of +35 within the L value of the desired metallic coating film. Containing at least 0.1% by volume of a brilliant material in a pigment volume concentration and having a dry film thickness of at least 10 μm and a light transmittance of 30 to 60% measured in a wavelength range of a desired metallic coating color at a wavelength of 400 nm to 700 nm. A method for forming a metallic coating film, characterized by applying a metallic paint for forming a transparent color, (5) laminating a low-concealing metallic coating film containing a glittering material on a solid color base coating film The difference in the thickness of the metallic coating is 15
In a method of forming a metallic coating film having a color difference (ΔE) of 1.5 or less in a range of μm or less, a lightness (L value) of 3
On a solid color base coat set in the range of 5 to 90 and within the range of L value of the desired metallic coat +35, the glitter material contains at least 0.1% by volume of the pigment and has a dryness of at least 10 μm. Wavelength 400 nm to 7 in film thickness
(6) a method of forming a metallic coating, which comprises applying a metallic paint that forms a transparent color having a light transmittance of 40 to 70% measured in a wavelength range of a desired metallic coating color at 00 nm. A low concealment top coat containing a glittering material is laminated on the color or color metallic color base coat as required, and a color difference (a thickness difference of the low concealment top coat in a range of 15 μm or less) is obtained. ΔE) is a method for forming a metallic coating film having a value of 1.5 or less, wherein a silver metallic color or a color metallic color whose lightness (L value) is set in a range of 35 to 90 and within a range of L value +35 of a desired metallic coating film On the undercoating film, the desired metallic material at a wavelength of 400 nm to 700 nm containing a glitter material at a pigment volume concentration of 0 to 2.0% and a dry film thickness of at least 10 μm. A method for forming a metallic coating film, wherein a coating color light transmittance measured at a wavelength range of painting low hiding ability topcoat coating composition forming a colored transparent 60-90%.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a paint for forming a gray undercoat film is an alkyd resin, a polyester resin,
An achromatic (gray) paint in which a base resin such as an acrylic resin or an epoxy resin and a crosslinking agent such as an amino resin and a polyisocyanate are used as a vehicle component, and a white pigment such as titanium white and a black pigment such as carbon black are blended. .

On the other hand, a paint for forming a solid color undercoat film is obtained by mixing a chromatic pigment such as a red, yellow, or blue color with the above-mentioned vehicle component, or a chromatic pigment and an achromatic pigment. It is a colored (chromatic) paint. In the present invention, when a solid color color is used for the undercoat film,
A more transparent metallic coating film can be obtained.

The paint for forming the silver metallic or color metallic undercoat is the above-mentioned paint for forming the above-described gray undercoat, and in the latter case, the above-mentioned solid color undercoat. This is a paint in which a glitter material described later is blended with a paint for forming a film. In the present invention, when a silver metallic color or a color metallic color is used for the undercoat film, a high metallic paint film is obtained even with a color clear containing no glittering material due to strong metal reflection from the undercoat, A metallic coating film having a vivid color tone at any angle (a very high saturation in a highlight portion and a pure color tone while exhibiting high saturation in a shade portion) can be obtained.

In the present invention, the brightness of the undercoat film is adjusted so that the L value becomes 35 to 90 by appropriately changing the blending amounts of the white pigment and the black pigment.

The coating film thickness of the undercoat is not particularly limited, but is generally in the range of 15 to 50 μm.

In the present invention, the metallic paint for forming the metallic coating film contains the above-mentioned vehicle component and a brilliant material as main components. Examples of the glittering material include metal pigments such as aluminum, stainless steel, nickel, and brass, pearl mica, and mica-like iron oxide (MI
O), metal-plated glass flake pigment (manufactured by Nippon Sheet Glass Co., Ltd., trade name: Metashine) or the like can be used.
Further, in addition to this glittering material, it contains a chromatic pigment usually used for coloring.

The brilliant material may have a pigment volume concentration (PVC) in the metallic coating, and may be 0 to 2.0% when the underlying coating film is silver or color metallic, but at least 0% in other cases. 0.1%, and the light transmittance of the metallic coating is 30 to 60 when a gray base is used.
%, From a range of 40 to 70% when a solid color base is used, and from 60 to 90% for a silver or color metallic color. Usually, the brilliant material is blended in the range of 0.1 to 8% except when the undercoat is metallic. When the blending amount of the glittering material is less than 0.1% of PVC, a coating film having a metallic feeling cannot be obtained. On the other hand, when the blending amount exceeds 8%, a composite color of the transparent color of the metallic coating film and the base coat film is formed. A highly transparent metallic coating cannot be obtained.

In the metallic coating structure of the present invention, a transparent or color clear layer is laminated on the metallic coating as required. As the clear layer, a transparent clear paint composed of the above-mentioned vehicle component or a color clear paint in which a transparent coloring pigment is blended with 5% or less of PVC is used. The coating thickness of the clear paint is generally 15
５０50 μm.

In the metallic coating structure of the present invention, the metallic coating is formed to have a thickness of at least 10 μm, preferably 10 to 30 μm. Since the metallic coating has low concealing properties, a color difference is likely to occur due to a variation in film thickness. For this reason, it is generally difficult to obtain a metallic coating having a color difference of 1.5 or less. However, in the present invention, the light transmittance of the metallic coating is set to 30 to 6 when the base is gray.
0%, 40-70% if the base color is solid color
In the case of a metallic color, it is adjusted to 60 to 90% to make it transparent, and this transparent color is positively used to combine this with a base coating film having a specific L value, whereby a difference in film thickness is obtained. Is within a range of 15 μm or less, and a metallic coating having a color difference of 1.5 or less can be obtained.

Here, the L value means a lightness index in the Hunter's color difference equation obtained from the tristimulus values X, Y, Z specified in JIS Z28722. The color difference is MINO
This is a value measured by a RUTA spectrophotometer CM-1000 (manufactured by Minolta).

The light transmittance is 400 nm to 70 nm.
The value measured in the wavelength range of the desired metallic coating color in the range of 0 nm, for example, 400 nm to 500 nm range when the color range of the metallic coating is blue, 550-500 in the case of yellow orange
It is a value measured in the 650 nm region, and in the case of the red system, in the 600 nm to 700 nm region. Normally, the light transmittance varies depending on the film thickness, but in the present invention, it is appropriately adjusted so that the metallic coating has the above-described light transmittance.

In the metallic coating film of the present invention, when the difference in the thickness of the metallic coating film is 15 μm or less, the color difference is 1.5.
It is important to select an undercoating film in order to form the following. In the present invention, based on the specific L value, that is, +35 of the L value of the desired metallic coating film.
It is necessary to select a base coating film set within the range, preferably within the range of 0 to 35. When the L value of the undercoating film is out of the range of the L value of the metallic coating film +35 or less,
Because the metallic coating has low opacity, the color tone fluctuates greatly,
A metallic coating having a color difference of 1.5 or less cannot be obtained.

The formation of the metallic coating film of the present invention is carried out by a method generally used for painting automobiles, motorcycles and the like. That is, the surface of the object to be coated is coated with a gray, solid color, or metallic base paint having a brightness within the L value of the desired metallic coating film +35. The painting method is spray painting,
Methods such as electrostatic air spray coating and rotary atomizing electrostatic coating can be used.

After the base paint is applied,
Leave for 10 minutes to partially remove the solvent, 70-160 ° C,
Bake for 10 minutes to 1 hour. Then, a metallic paint is painted thereon and baked under the same baking conditions, or a metallic paint is applied thereon by the above-described coating method without baking the base paint, and two layers are simultaneously baked under the above-mentioned baking conditions. A metallic coating is obtained.

When the clear paint is applied, it is baked under the same conditions as the above-mentioned base paint and metallic paint. However, in general, the base paint, metallic paint and clear paint are respectively applied by wet-on-wet and baked. The coating is performed by a three-coat one-bake method, or a three-coat two-bake method in which a base paint is baked, and a metallic paint and a clear paint are applied thereon by wet-on-wet and baked.

[0023]

Next, the present invention will be described with reference to examples and comparative examples. Parts represent parts by weight.

EXAMPLE 1 A melamine alkyd resin paint (manufactured by Kansai Paint Co., trade name: Amirac gray color) was used as a gray base paint, and the L value of the coating film was 37, 53, 62, 70, 82 and 90 paints A to F giving six types of L values were prepared.

Each of the obtained base coats was applied to a surface-treated steel sheet so as to have a dry film thickness of 30 μm.
Baking was performed at 60 ° C. for 30 minutes. Then, a metallic paint (manufactured by Kansai Paint Co., Ltd., trade name: Soflex 5100 orange) containing 40% of light transmittance, L value of 51, and 2.5% of PVC with pearl mica was coated on the undercoat film of the obtained coated plate. The coating is applied to a dry film thickness of 20 μm, and a clear paint (manufactured by Kansai Paint Co., Ltd., trade name: Rethane PG Clear) is applied thereon by wet-on-wet so as to have a dry film thickness of 25 μm, and heated at 80 ° C. for 30 minutes. Cured. The six types of metallic coated plates thus obtained were each used as a reference coating film. On the other hand, the above-mentioned metallic paint was applied on the above-mentioned six types of undercoat films to a dry film thickness of 35 μm, and the above-mentioned clear paint was applied to a dry film thickness of 25 μm to obtain a metallic paint film. Table 1 shows the color difference (ΔE) between the metallic coating thus obtained and the reference coating. In addition, the thing using the base paint F is equivalent to a comparative example.

Example 2 The melamine alkyd resin paint used in Example 1 and Amirac (red) were used as the solid color base paint, and the L value of the coating film was 37, 53, 62, 70 and 82.
Coatings A to E giving different L values were prepared.

The obtained base coating material was applied to a surface-treated steel sheet so as to have a dry film thickness of 30 μm.
Baking was performed at 60 ° C. for 30 minutes. Then, a metallic paint (manufactured by Kansai Paint Co., Ltd., trade name: SOFLEX 5100 red) containing 68% of light transmittance, L value of 28 and pearl mica of 0.6% of PVC was coated on the undercoat film of the obtained coated plate. The coating was applied to a dry film thickness of 20 μm, and a clear paint (the one used in Example 1) was applied thereon by wet-on-wet to a dry film thickness of 25 μm.
Heat cured for 30 minutes. The five types of metallic coated plates thus obtained were used as reference coating films.

On the other hand, the above-mentioned metallic paint was applied on the five types of undercoat films obtained from the above-mentioned undercoat paints A to E to a dry film thickness of 35 μm, and the clear paint was applied to a dry film thickness of 25 μm.
m to give a metallic coating. Table 1 shows the color difference (ΔE) between the metallic coating film thus obtained and the reference coating film.
It was shown to. Note that those using the base coating materials D and E correspond to comparative examples.

Example 3 A urethane resin paint (manufactured by Kansai Paint Co., Ltd., trade name: SOFLEX blue) was used as a color metallic base paint, and the L value of the coating film was 37, 53, 62, 70, 82 and 90. The coatings A to F giving the six types of L values were prepared.

The obtained base coat was applied to a surface-treated steel sheet so as to have a dry film thickness of 20 μm. Then, a light transmittance of 88 mm was applied on the base coat of the obtained coated plate by wet-on-wet. %, A clear paint containing no brilliant material having an L value of 43 (manufactured by Kansai Paint Co., Ltd., trade name: SOFLEX 5200 blue) was applied to a dry film thickness of 20 μm, and was heated and cured at 80 ° C. for 30 minutes. The six types of metallic coated plates thus obtained were each used as a reference coating film.

On the other hand, the above-mentioned color clear paints were applied on the above-mentioned six kinds of color metallic base coats by wet-on-wet, respectively, to a dry film thickness of 35 μm to obtain metallic paint films. Table 2 shows the color difference (ΔE) between the metallic coating film thus obtained and the reference coating film. Also,
Table 2 shows the measurement results of the change in color tone and light luminance. Note that those using the base paints E and F correspond to comparative examples.

Example 4 The color metallic paint used in Example 3 was used as the base paint, and the L value of the coating film was 37, 53, 62, 70, 82.
And 90 paints A to F which give six kinds of L values were prepared.

Each of the obtained base coats was applied to a surface-treated steel sheet so as to have a dry film thickness of 20 μm. Then, the base coat of the obtained coated board was wet-on-wet in Example 3 The color clear paint used was coated with a paint containing 0.05% PVC containing a metal-plated glass flake pigment (manufactured by Nippon Sheet Glass Co., Ltd., Metashine) so as to have a dry film thickness of 20 μm, and was cured by heating at 80 ° C. for 30 minutes. did. The six types of metallic coated plates thus obtained were each used as a reference coating film.

On the other hand, the above-mentioned metal-plated glass flake pigment-containing paint is applied on the above-mentioned six types of color metallic color base coating films by wet-on-wet, respectively, to a dry film thickness of 35%.
It was coated to a thickness of μm to obtain a metallic coating film. Table 2 shows the color difference (ΔE) between the metallic coating film thus obtained and the reference coating film. Table 2 shows the measurement results of the change in color tone and light luminance. Note that those using the base paints E and F correspond to comparative examples.

[0035]

[Table 1]

[0036]

[Table 2]

(* 1) The change in color tone was measured by a variable-angle high-speed spectrophotometer GSP-1 manufactured by Murakami Color Research Laboratory.
(The incident angle is fixed at 45 ° and the received angle is changed. The received angle is -25 °
〜0 ° is a shade portion, and 25 ° is a highlight color. (* 2) Brightness is visually evaluated. ◎ Both highlights and shades have a strong metallic or glittering feeling. ○ High metallic or glittering highlights. △ Both highlights and shades have weak metallic or glittering feeling.

[0038]

According to the present invention, by setting the brightness of the gray, solid color or metallic base coat, the thickness of the metallic coat and the light transmittance in a specific range, the metallic coat can be formed. Even with a low concealing property, a metallic coating film which has a small change in color tone, a high chroma of 1.5 or less in color difference, and excellent luster can be obtained in a medium to high brightness range.

Claims (18)

[Claims] 1. A low-concealment metallic coating containing a brilliant material is laminated on a gray base coating, and a color difference (Δ) in a range where the thickness difference of the metallic coating is 15 μm or less.
E) In a metallic coating structure in which 1.5 or less,
The lightness (L value) of the gray base coating film is set within a range of 35 to 90 and within the range of the L value of the desired metallic coating film +35, and the metallic coating film contains the glittering material at a pigment volume concentration of at least 0%. 0.1%, and a light transmittance measured at a dry film thickness of at least 10 μm in a wavelength range of a desired metallic coating color at a wavelength of 400 nm to 700 nm of 30 to 30 nm.
A metallic coating structure characterized by a 60% sheer color. 2. The metallic coating structure according to claim 1, wherein the lightness (L value) of the gray base coating film is in a range of the desired metallic coating L value + 0 to 35 or less. 3. The metallic coating structure according to claim 1, wherein the metallic coating contains a glittering material in a volume concentration of 0.1 to 8% of the pigment. 4. The minimum dry film thickness of the metallic coating film is 10 to 10.
4. The metallic coating structure according to claim 1, which has a thickness of 30 [mu] m. 5. The metallic coating structure according to claim 1, wherein a transparent or color clear coating is laminated on the metallic coating. 6. A low-concealing metallic coating containing a glittering material is laminated on a solid color base coating, and a color difference (ΔE) in a range where the thickness difference of the metallic coating is 15 μm or less. Is not more than 1.5, the lightness (L value) of the solid color undercoating film is set in a range of 35 to 90 and within the L value of the desired metallic coating film +35, and The metallic coating contains at least 0.1% by volume of the glitter material at a pigment volume concentration, and has a wavelength of 400 nm to 700 nm at a dry film thickness of at least 10 μm.
Wherein the light transmittance measured in a wavelength range of a desired metallic coating color is a transparent color of 40 to 70%. 7. The lightness (L) of a solid color undercoat film
7. The metallic coating structure according to claim 6, wherein (value) is within a range of the L value of the desired metallic coating plus 0 to 35. 8. The metallic coating structure according to claim 6, wherein the metallic coating contains a glitter material in a pigment volume concentration of 0.1 to 8%. 9. The metal film having a minimum dry film thickness of 10 to 10.
9. The metallic coating structure according to claim 6, which has a thickness of 30 μm. 10. The metallic coating structure according to claim 6, wherein a transparent or color clear coating film is laminated on the metallic coating film. 11. A low concealment top coat containing a glittering material, if necessary, on a silver metallic or color metallic base coat, and a difference in film thickness of the low concealment top coat. In a metallic coating structure having a color difference (ΔE) of 1.5 or less in a range of 15 μm or less, the silver metallic color or the color metallic color undercoat has a lightness (L value) of 35 to 90 and a desired metallic coating Is set within the range of L value +35, and the low concealment top coat contains a glittering material in an amount of 0 to 2.0% by pigment volume concentration, and has a dry film thickness of at least 10 μm and a wavelength of 400 nm to 400 nm.
A metallic coating structure having a light transmittance of 60 to 90% measured in a wavelength range of a desired metallic coating color at 700 nm. 12. The metallic coating structure according to claim 11, wherein the lightness (L value) of the silver metallic or color metallic base coat is within the range of +35 of the desired metallic coating. 13. The metallic coating structure according to claim 11, wherein the glittering material is a metal-plated glass flake pigment. 14. The low-concealment topcoat having a minimum dry film thickness of 1
14. The metallic coating structure according to claim 11, which has a thickness of 0 to 30 [mu] m. 15. A transparent or color clear coating film laminated on a low concealment top coat film.
4. The metallic coating structure according to 4. 16. A low concealment metallic coating containing a glittering material is laminated on a gray base coating, and a color difference (ΔE) of 1. is provided when the thickness difference of the metallic coating is 15 μm or less. In a method of forming a metallic coating film having a brightness value (L value) of 35 to 90 and a value within a range of L value of a desired metallic coating film +35, a glittering material is formed on the gray base coating film. At a pigment volume concentration of at least 0.1
% And a dry film thickness of at least 10 μm and a wavelength of 40
A method for forming a metallic coating film, which comprises applying a metallic paint which forms a transparent color having a light transmittance of 30 to 60% measured in a wavelength range of a desired metallic coating color at 0 nm to 700 nm. 17. A low-concealment metallic coating containing a glittering material is laminated on a solid color base coating, and a color difference (ΔE) of 1 is provided when the thickness difference of the metallic coating is 15 μm or less. In a method of forming a metallic coating film having a brightness of not more than 0.5, the brightness (L value) is 35 to 90, and the brightness of the metallic coating film is set within the range of +35 within the desired metallic coating film. Light-transmitting material having a pigment volume concentration of at least 0.1% and a dry film thickness of at least 10 μm having a light transmittance of 40 measured at a wavelength of 400 to 700 nm of a desired metallic coating color.
A method for forming a metallic coating film, which comprises applying a metallic paint that forms a transparent color of up to 70%. 18. A low concealment top coat containing a glittering material, if necessary, on a silver metallic or color metallic base coat, and the difference in thickness of the low concealment top coat is 15 μm. In a method of forming a metallic coating film having a color difference (ΔE) of 1.5 or less in the following range, the lightness (L value) is 35 to 90 and the L of the desired metallic coating film is
A glitter material is contained in a pigment volume concentration of 0 to 2.0% on a silver metallic or color metallic color base coat set in a range of +35 or less and at least 10 μm
The light transmittance measured in a wavelength range of a desired metallic coating color in a wavelength range of 400 nm to 700 nm at a dry film thickness of 6 is 6
A method for forming a metallic coating film, which comprises applying a low concealment top coat which forms a transparent color of 0 to 90%.