JP2002080792A - Brilliant coating composition, method for forming coating film and brilliant coated article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brilliant coating composition, a method for forming a coating film and a brilliant coated article, in which a metal-gloss design having massive feeling can be expressed, such a design being impossible with a conventional brilliant coating. SOLUTION: A basal coating film layer is formed on a base material such as an aluminum wheel for an automobile, and a brilliant coating composition containing a brilliant pigment produced by placing silica on the outermost surface of stainless steel flakes coated with a metal oxide is applied on it to form a brilliant coating film layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glitter coating composition containing a glitter pigment coated on the outermost surface of a metal oxide-coated stainless flake with silica and a vehicle,
The present invention relates to a method for forming a coating film and a glittering product obtained by the method.

[0002]

2. Description of the Related Art As a paint for expressing a brilliant design on materials such as an automobile body and an aluminum wheel, a mixture of a flaky metal pigment and a colored pigment, an interference mica whose surface is coated with titanium dioxide, and the like are available. A glittering paint using colored mica or the like whose surface is coated with iron oxide or an organic pigment is used. Also, for example, JP-A-2-142882 describes a glittering paint containing a flaky colored aluminum pigment, and JP-A-5-70719 describes a glittering paint using a flaky colored aluminum pigment and mica in combination. Have been.

[0003]

However, the coating film formed by these conventional glittering paints has a feeling of "silver paint" rather than "metallic (metallic tone)" and has a true metallic luster. It was difficult to develop a feeling of weight close to. Accordingly, an object of the present invention is to provide a glitter paint composition, a method of forming a coating film, and a glitter paint which can exhibit a heavy metallic luster design that cannot be exhibited by a conventional glitter paint.

[0004]

The glitter coating composition of the present invention is characterized by containing a glitter pigment obtained by coating silica on the outermost surface of a metal oxide-coated stainless flake and a vehicle. As the metal oxide,
Examples include titanium oxide and iron oxide. The mass percentage (PWC) of the solid content of the pigment to 100 parts by mass of the solid content of the glitter pigment is preferably 0.01 to 80%. Further, the glitter coating composition may contain resin beads.

In the method of forming a coating film of the present invention, a multi-layer coating film is formed by sequentially laminating a base coating film layer and a glitter coating film layer formed by the glitter coating composition on a substrate. . Alternatively, a multi-layer coating film is formed by sequentially laminating a base coating layer, a glitter coating layer formed of the glitter coating composition, and a clear top coating layer on a substrate. When the lightness of the base coating layer is not more than N4 in the Munsell display system, a metallic design in which the color of the base coating film and the color of the glittering coating film are combined can be obtained. Further, the clear overcoat layer is formed by (1) a carboxyl group-containing polymer and an epoxy group-containing polymer, (2) a fluororesin, or
(3) When formed from a paint containing a silicone resin, the weather resistance and acid rain resistance of the coating film can be enhanced.

[0006] The glittering coating of the present invention is formed by forming a glittering coating on a substrate by using the coating forming method of the present invention. Suitable examples of the object to be coated include aluminum wheels for automobiles.

[0007]

Embodiments of the present invention will be described below in detail.

[Glitter coating composition] The glitter coating composition of the present invention comprises a metal oxide-coated stainless flake coated with silica on the outermost surface as a material for expressing a heavy metallic luster. Pigment (hereinafter referred to as “stainless flake pigment”). That is, this stainless flake pigment is SUS304, S
A thin film of titanium oxide, iron oxide, or a metal oxide such as chromium, cobalt, tin, or zirconium is formed on the surface of a stainless flake manufactured by grinding stainless steel such as US316L, and amorphous silica is formed on the outermost surface layer. Etc. coated with silica.

[0009] A stainless flake pigment for a colored metallic glossy paint in which the surface of a stainless flake is coated with titanium oxide is disclosed in, for example, Japanese Patent Application Laid-Open No. H10-110113, but lacks weather resistance and water resistance. It was difficult to use. However, sufficient weather resistance and water resistance can be obtained by coating with silica. The coating amount of silica is 1 to 10% by mass based on stainless flakes,
More preferably, it is 3 to 7% by mass. If the coating amount of silica is less than 1% by mass, the weather resistance of the stainless steel flake pigment is insufficient, and the metallic color may be faded.
If it exceeds 300, it may be difficult to give a heavy feeling unique to stainless flake.

The color tone of the stainless flake pigment can be adjusted by changing the type and amount (coating thickness) of the metal oxide to be coated. Taking titanium oxide coating as an example, a coating of 5.0% by mass based on stainless flakes gives a bluish tint. Similarly, 7.0
By applying the titanium oxide coatings of mass%, 8.3 mass% and 10.5 mass%, dark gold, light gold and red bean can be developed, respectively.

The stainless flake pigment has a flake-like structure having a major axis and a minor axis. In this specification, the average particle diameter of the major axis is referred to as the average particle diameter. The average particle diameter including the metal oxide coating and the silica coating is preferably from 10 to 40 μm. If the average particle diameter is less than 10 μm, it is difficult to obtain a desired design, and if it exceeds 40 μm, poor appearance of the coating film may occur.

In the glitter coating composition of the present invention, the stainless steel flake pigment has a solid content ratio (PWC) of 0.01 to 80%, preferably 5 to 50%, based on 100 parts by weight of the solid content of the coating material. 15-45% is even more preferred. If it is less than 0.01%, a heavy metallic luster may not be obtained, and if it exceeds 80%, the appearance of the coating film may be deteriorated.

The vehicle contained in the glitter coating composition of the present invention disperses the above-mentioned stainless flake pigment, and is composed of a resin for forming a coating film and, if necessary, a crosslinking agent. Examples of the coating film forming resin constituting the vehicle include (a) an acrylic resin, (b) a polyester resin, (c) an alkyd resin, (d) a fluororesin,
(E) epoxy resin, (f) polyurethane resin, (g)
Polyether resins, and these can be used alone or in combination of two or more. Among them, it is preferable to use an acrylic resin and a polyester resin.

As the acrylic resin (a), there can be mentioned a copolymer of an acrylic monomer and another ethylenically unsaturated monomer. Acrylic monomers that can be used in the copolymerization include methyl (meth) acrylate, ethyl, propyl, n-butyl, i-butyl and t-butyl acrylate.
Esters such as butyl, 2-ethylhexyl, lauryl, phenyl, benzyl, 2-hydroxyethyl and 2-hydroxypropyl / ring-opened adduct of caprolactone of 2-hydroxyethyl (meth) acrylate / glycidyl (meth) acrylate; (Meth) acrylamide, N-methylol (meth) acrylamide and the like. Further, as other ethylenically unsaturated monomers copolymerizable with these,
Examples include styrene, α-methylstyrene, itaconic acid, maleic acid, and vinyl acetate.

The polyester resin (b) includes, for example, a saturated polyester resin and an unsaturated polyester resin comprising a condensate of a polybasic acid and a polyhydric alcohol. Saturated polybasic acids as raw materials include phthalic anhydride, terephthalic acid, succinic acid and the like, and unsaturated polybasic acids include maleic acid, maleic anhydride, fumaric acid and the like. On the other hand, polyhydric alcohols include dihydric alcohols and trihydric alcohols, and dihydric alcohols include ethylene glycol and diethylene glycol. Trihydric alcohols include glycerin and trimethylolpropane.

The resin for forming a film includes a curable resin and a solvent-drying type lacquer. As the resin for forming a film, a curable resin is usually used. To the curable resin, an amino resin, a (block) polyisocyanate compound, other amines, polyamides, polyvalent carboxylic acid, or the like is added as a crosslinking agent, and the curing reaction can proceed at heating or at room temperature. In addition, it is also possible to use a curable resin and a lacquer together.

When the vehicle contains the above-mentioned cross-linking agent, the ratio of the film-forming resin to the cross-linking agent is 90 to 50% by mass, and the cross-linking agent is 10 to 50% by mass in terms of solid content. Yes, preferably 85 to 60% by mass of the resin for forming a coating film,
The crosslinking agent is 15 to 40% by mass. 10% by mass of crosslinking agent
Less, or when the coating film forming resin exceeds 90% by mass,
Insufficient crosslinking in the coating film. On the other hand, when the cross-linking agent exceeds 50% by mass or the resin for forming a coating film is less than 50% by mass, the storage stability of the coating composition decreases and the curing speed increases, so that the appearance of the coating film deteriorates.

The glitter coating composition of the present invention can be used as a finish in which the matte feeling (matte tone) is further enhanced by using resin beads together with the above stainless flake pigment. The resin beads to be used preferably have an average particle diameter of 3 μm to 38 μm, and more preferably 8.8 μm to 20 μm, formed from general-purpose acrylic, polyamide, polyethylene and other resins. The addition amount is 0.1 to 10 times (mass) the addition amount of the stainless flake pigment, provided that the total amount with the stainless flake is P
A range not exceeding 50% in WC is preferred.

Other glitter pigments and coloring pigments can be added to the glitter coating composition of the present invention. Other glitter pigments, for example, aluminum flake,
Colored aluminum flakes, mica, metal titanium flakes, alumina flakes, silica flakes, graphite, stainless flakes, plate-like iron oxides, phthalocyanine flakes, and other glittering pigments can be given. Examples of the coloring pigments include azo lake-based pigments. , Phthalocyanine-based, indigo-based, perylene-based, quinophthalone-based, dioxazine-based, quinacridone-based, isoindolinone-based, metal complex, and other color pigments, and graphite, yellow iron oxide, red iron oxide, titanium dioxide, carbon black, and the like. be able to. The amount of these bright pigments and coloring pigments added is
It can be set arbitrarily as long as the effect of the stainless flake pigment and the composite color effect with the underlayer are not hindered. An extender pigment such as calcium silicate or precipitated barium sulfate can also be used in combination.

The glitter coating composition of the present invention further comprises, in addition to the above components, a polyamide wax which is a lubricating dispersion of an aliphatic amide, a polyethylene wax which is a colloidal dispersion mainly composed of polyethylene oxide, and a sedimentation preventive. Agents, curing catalysts, UV absorbers, antioxidants, leveling agents, surface conditioners such as silicon and organic polymers, anti-sagging agents, thickeners, defoamers, crosslinkable polymer particles (microgels), etc. Can be added. If these additives are blended at a ratio of, for example, 15 parts by mass or less with respect to 100 parts by mass of the vehicle (based on solid content), the performance of a paint or a coating film can be improved.

The glitter coating composition of the present invention is usually provided in a form in which the above components are dissolved or dispersed in a solvent. The solvent is not limited as long as it dissolves or disperses the vehicle, and an organic solvent and / or water can be used. Examples of the organic solvent include those commonly used in the coatings field, for example, hydrocarbons such as toluene and xylene, ketones such as acetone and methyl ethyl ketone, esters such as ethyl acetate, cellosolve acetate, and butyl cellosolve, and alcohols. it can. In addition, it is preferable from the viewpoint of environmental protection if an aqueous coating composition is formed by using water as a solvent. In this case, an appropriate amount of a hydrophilic organic solvent may be contained.

[Coating film forming method] The coating film forming method of the present invention comprises a base coating layer, a brilliant coating layer formed by the brilliant coating composition of the present invention, and a clear topcoat film on a substrate. In this method, layers are sequentially laminated to form a multilayer coating film.
By omitting the clear coating layer, a coating film having a matte feeling can be obtained. Also, as described above, the use of the glitter coating composition to which the resin beads are added can further enhance the matte feeling.

There is no particular limitation on the substrate that can be used.
Examples of the base material include metals such as untreated steel, zinc steel, and the like, aluminum, copper, and alloys thereof, inorganic materials such as glass, cement, and concrete, polyethylene resin, polypropylene resin, and ethylene-vinyl acetate. Natural or synthetic resin such as polymer resin, polyamide resin, acrylic resin, vinylidene chloride resin, polycarbonate resin, polyurethane resin, epoxy resin, various plastic materials such as FRP, wood, fiber material (paper, cloth, etc.) Materials and their processed products are listed.

In the method for forming a coating film of the present invention, the above-mentioned substrate is coated with the glitter coating composition of the present invention via a base coating layer. In the case of automotive parts, the base material is preliminarily coated with a base coat such as a degreasing or chemical conversion treatment, an undercoating such as an electrodeposition coating or a powder coating, and, if necessary, an intermediate coating. Is preferred.

In the method for forming a coating film of the present invention, a base coating film,
A glitter coating film and a clear coating film can be formed by a wet-on-wet (W / W) method or a wet-on-dry (W / D) method to form a multilayer coating film. In addition, W /
The W method is a method in which the lower layer coating film is dried by air drying or the like to leave it in an uncured state or a semi-cured state, and the upper layer is coated thereon and baked and cured at once. The W / D method is a method in which a lower layer coating film is baked and cured, and an upper layer coating film is applied and further baked. The method for forming each coating layer is not particularly limited, but a spray method, a roll coater method, or the like is preferable, and each coating layer can be coated a plurality of times. The coating is baked at 80 to 160 ° C. for a predetermined time.

The base coating film layer used in the coating film forming method of the present invention can be formed by a solvent type paint or a powder type paint. The paint to be used is adjusted by appropriately combining the vehicle constituting the above glittering paint composition and the above-mentioned pigments and additives which can be added as required. The dry film thickness of the base coating film layer is preferably from 30 to 200 μm, and if it is out of this range, the appearance of the coating film may be deteriorated. More preferably, it is 50 to 150 μm. In addition, by setting the brightness of the base coating layer to a dark color having a brightness of N4 or less in the Munsell display system, a combined effect with the glitter coating layer formed by the glitter coating composition of the present invention allows the interference color to be obtained. White blur can be prevented, and a heavy metallic color tone can be further enhanced. Similarly, when the base coating film layer is a clear coating film, the brightness of the base coating film or the base material under the clear coating film can be set to N4 or less.

On the base coating layer, a glitter coating layer is formed by the glitter coating composition of the present invention. It is preferable to use a W / D method for forming a multilayer film of the base coating layer and the glittering coating composition. The dry film thickness of the glittering coating layer is 10
To 100 μm, more preferably 20 to 50 μm
m.

When it is desired to impart a glossiness to the surface of the coating film, a clear top coating film layer is further formed as a top coat layer on the glittering coating film layer. In this case, in addition to the improvement in the gloss, it is possible to prevent the glitter pigment from being damaged and to improve the smoothness. When the glittering coating layer contains a relatively large amount of glittering pigment, it is possible to further improve the smoothness of the surface by coating two or more layers of the clear paint. It is preferable to use the W / W method for forming the clear top coat layer. In the case where the clear paint is applied a plurality of times, baking may be performed at a time after the final clear paint is applied, and it is not necessary to completely cure the clear paint at the initial coating stage. The dry film thickness of the clear top coat layer is preferably 30 to 400 μm, and if it is out of this range, the appearance of the coat may be deteriorated. A more preferred dry film thickness is 50 to 200 μm.

The clear top coat layer can be formed by a general clear paint. A so-called turbid clear coating film having a semi-transparent feeling can also be used. The clear coating may be any of a solvent type and a powder type. As the solvent type coating, a one-part type coating may be used, or a two-part type coating such as a two-part type urethane resin coating may be used. . As a particularly preferable clear paint, a clear paint containing a carboxyl group-containing polymer and an epoxy group-containing polymer described in JP-B-8-19315 can be exemplified. This clear paint has high acid resistance and thus is resistant to acid rain, and further has such features as not disturbing the orientation of the glitter material in the glitter coating layer when applied to the glitter coating layer by the W / W method. Further, general-purpose fluorine resin or silicone resin can be preferably used because of high weather resistance. These clear coatings, if necessary, as long as the transparency is not impaired, coloring pigments, extenders, modifiers, ultraviolet absorbers, leveling agents, dispersants,
Additives such as defoamers may be included.

[Glitter coating] The glitter coating of the present invention has a base coating layer, a glitter coating layer of the present invention and, if necessary, a clear top coating layer on a substrate. It is. When the clear top coat layer is not formed, a coated surface with a heavy metallic matte design can be obtained, and if resin beads are added to the glitter coating layer, the matte feeling can be further emphasized. Can be. When a clear top coat layer is formed, a coated surface having a heavy metal-like glossy design can be obtained. Regardless of the presence or absence of the clear coating layer, if the brightness of the base layer, etc., which is the lower layer of the glittering coating layer, is less than or equal to the lightness N4 in the Munsell display system, it is possible to prevent interference color white blurring and to achieve a heavy metal tone. Can be further enhanced.

[0031]

Next, the present invention will be described more specifically with reference to examples and comparative examples. In addition, the compounding amount represents a mass part unless there is particular notice.

[0032]

Examples 1 to 10 and Comparative Examples 1 to 4 [Preparation of base material] An aluminum wheel for automobiles was sequentially subjected to a degreasing treatment and a treatment with a surface conditioner.
g / m ² and so as to chromate treatment agent ( "Alsurf 1000", Nippon Paint Co., Ltd.) was subjected to a chemical conversion treatment at.

[Coating for Forming Base Coating Layer] The following coatings were used for forming the base coating.

(1) Base paint A: Acrylic resin type powder clear paint ("Powax A50 Clear",
Nippon Paint Co., Ltd.).

(2) Base paint B: Acrylic resin powder black (N1) paint ("Powax A30 Black", manufactured by Nippon Paint Co., Ltd.).

(3) Base paint C: Acrylic resin powder type dark gray (N4) paint ("Powdex A30
Dark gray ", manufactured by Nippon Paint Co., Ltd.).

(4) Base paint D: Acrylic resin-based solvent-based clear paint ("Super Lac M90 Clear", manufactured by Nippon Paint Co., Ltd.).

(5) Base paint E: Acrylic resin-based solvent-type black (N1) paint ("Superlac M90 Black", manufactured by Nippon Paint Co., Ltd.).

[Preparation of glitter coating composition] Acrylic resin (copolymer of styrene / methyl methacrylate / ethyl methacrylate / hydroxyethyl methacrylate / methacrylic acid, number average molecular weight: about 20,000, hydroxyl value: 4)
5, acid value 15, solid content 50% by mass) and a melamine resin (“Uban 20SE”, manufactured by Mitsui Chemicals, Inc., solid content 60% by mass) in a vehicle obtained by blending at a solid content mass ratio of 80:20. On the other hand, a stainless flake pigment was blended under the conditions shown in Table 1 below. The stainless flake pigments used each had an average particle size of 25 μm with the outermost surface coated with 5.0% by mass of amorphous silica, and had a blue pigment (coated with 5.0% by mass of titanium oxide) and a dark gold pigment (coated with titanium oxide). 7.0
Mass pigment), bright gold pigment (8.3 mass% titanium oxide coating), and red bean pigment (10.5 mass% titanium oxide coating).

As a comparative example, an industrial aluminum flake pigment ("Alpaste", manufactured by Toyo Aluminum Co., Ltd.), a cyanine blue pigment and carbon black were appropriately prepared to prepare a metallic color having the same hue as the blue pigment. It was blended with the above-mentioned vehicle under the same conditions (displayed as "blue metallic" in Table 1). Further, Examples 9 and 10
In Comparative Example 3, acrylic resin beads ("Lab Color 230F", manufactured by Dainichi Seika) were added under the conditions shown in Table 1. Next, an organic solvent (toluene / xylene /
Mass ratio of ethyl acetate / butyl acetate = 70/15/10 //
Along with 5), the mixture was stirred and mixed by a stirrer so as to obtain an appropriate coating viscosity, thereby preparing a glittering paint.

[Clear paint] As clear paint,
The following paints were used.

(1) Clear paint A: Acrylic resin-based solvent clear paint ("Super Lac O-130 Clear", manufactured by Nippon Paint Co., Ltd.).

(2) Clear coating B: a solvent-type clear coating made of a blend of a carboxyl group-containing polymer and an epoxy group-containing polymer ("Macflow O-520 Clear", manufactured by Nippon Paint Co., Ltd.).

(3) Clear paint C: Acrylic resin-based powder clear paint ("Powax A-400", manufactured by Nippon Paint Co., Ltd.).

(4) Clear paint D: Two-component urethane solvent-based clear paint ("nx perioclear",
Nippon Paint Co., Ltd.).

[Formation of multi-layer coating film]
Were formed in order. The base coating layer,
A baking temperature of 160 ° C. for powder type paints and a dry film thickness of 100 μm for 10 minutes in a solvent type paint are set to 1 μm.
The film is formed so as to have a dry film thickness of 50 μm in 5 minutes at 50 ° C., and then the glitter coating film is coated with the glitter paint shown in Table 1 at a baking temperature of 150 ° C. for 5 minutes to have a dry film thickness of 30 μm. Painted and formed. When forming a clear top coat layer, the baking temperature is 160 ° C.
In a solvent-type clear paint, the baking temperature is 150 ° C. and the dry film thickness is 5 in 5 minutes so that the dry film thickness becomes 100 μm in 10 minutes.
It was applied to a thickness of 0 μm to form a multilayer coating film. The design feeling of the obtained coating film was evaluated by the following method. Table 2 shows the results.
Shown in

[Evaluation method] <Metallic weight feeling> The design feeling of the aluminum automobile wheel was visually evaluated. A: A metallic coating film surface with a particularly heavy feeling is formed. …: Both the feeling of weight and the metallic tone are at the same level. X: Metallic tone but no weight.

[0048]

[Table 1]

[0049]

[Table 2]

As is clear from the results shown in Table 2, in Examples 1 to 10, since the coating film was formed using the glitter paint containing the stainless steel flake pigment of the present invention, a heavy metal design was obtained. Was emphasized, and a sense of quality came out. on the other hand,
In the case of the wheel using the conventional aluminum flake of the comparative example, both in the case of glossy coated with clear coating and in the case of matte without clear, it seems that both were `` merely painted in silver '' rather than `` metallic '' there were.

[0051]

The glitter paint composition of the present invention contains a glitter pigment (stainless flake pigment) in which a stainless steel flake is coated with a metal oxide and the outermost surface thereof is coated with silica. Can express a metal-like design with a different weight. Further, by adding resin beads to the glitter coating composition of the present invention, a coating film having a matt design can be formed.

According to the method for forming a coating film of the present invention, a base coating layer, a glitter coating layer having a stainless flake pigment, and a clear top coating layer, if necessary, are sequentially laminated on a substrate to form a multilayer coating. When a film is formed, a heavy metal design can be exhibited by the combined action of the base coating layer and the glittering coating layer. In the glittering coating film of the present invention,
By setting the base layer to have a brightness of N4 or less, a color tone having a brightness of N4 or less and the glitter of the stainless steel flake pigment are synthesized, so that interference colors can be emphasized.

The brilliant coated product of the present invention obtained by the above-mentioned method for forming a coating film has a metal design with a heavy and high-grade feel, so that it can be used for the outer surfaces of vehicles such as automobiles and motorcycles, the outer surfaces of various containers, and the coil coating. It is useful as a paint for various products such as the home appliance industry. Further, since it is excellent in weather resistance and water resistance, it can be particularly suitably used as a paint for products used outdoors such as wheels for automobiles.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09C 1/20 C09C 1/20 3/06 3/06 C09D 5/00 C09D 5/00 Z 7/12 7 / 12 (72) Inventor Masashi Takahashi 4-1-115 Minamishinagawa, Shinagawa-ku, Tokyo F-term in Japan Paint Co., Ltd. 4D075 AE03 CA32 CA38 CA44 CB06 CB13 DA06 DA23 DB02 DB05 DB06 DB07 DB12 DB13 DB18 DB20 DB21 DB36 DB38 DB40 DB43 DB47 DB48 DB50 DB53 DB61 DC10 DC11 DC18 DC41 EA02 EA07 EA10 EA43 EB16 EB20 EB22 EB32. DD181 DF001 DG001 HA066 HA216 HA446 KA08 KA15 KA20 NA01 PB07 PC02

Claims (10)

[Claims] 1. A glitter coating composition containing a glitter pigment obtained by coating silica on the outermost surface of a metal oxide-coated stainless flake and a vehicle. 2. The glitter coating composition according to claim 1, wherein the metal oxide is titanium oxide or iron oxide. 3. The pigment solid content ratio (PWC) to the coating solid content of 100 parts by mass of the glitter pigment is 0.00.0%.
The glittering coating composition according to claim 1, which is 1 to 80%. 4. A glitter coating composition comprising a glitter pigment obtained by coating the outermost surface of a metal oxide-coated stainless flake with silica, resin beads, and a vehicle. 5. A base coat layer on a substrate,
5. A coating film forming method, wherein a glitter coating film layer formed of the glitter coating composition according to any one of 4 is sequentially laminated to form a multilayer coating film. 6. A base coat layer on a substrate, wherein the base coat layer is a base coat layer.
A coating film forming method for forming a multilayer coating film by sequentially laminating a glitter coating layer and a clear top coat layer formed by the glitter coating composition according to any one of the above. 7. The method according to claim 5, wherein the brightness of the base coating layer is not more than N4 in a Munsell display system. 8. The method according to claim 1, wherein the clear top coat layer comprises (1) a carboxyl group-containing polymer and an epoxy group-containing polymer, (2) a fluororesin, or (3) a silicon resin.
The coating film forming method according to claim 6, wherein the coating film is formed from a paint containing: 9. The method according to claim 5, wherein the object to be coated is formed on the object to be coated.
A glittering coating product, wherein a glittering coating film is formed by the coating film forming method according to item 6. 10. The glittering article according to claim 9, wherein the article to be coated is an aluminum wheel for automobiles.