Flaky metallic color powder, metallic color paint, metallic color resin pellet, cosmetics, container, interior and exterior vehicle components, method for producing flaky metallic color powder

Abstract

To provide a metallic color flake powder that can generate various metallic colors in a single layer, a metallic color coating material, a metallic color resin pellet, cosmetics, a container, interior and exterior members for vehicles, and a method for producing a metallic color flake powder.SOLUTION: The present invention provides a metallic color flake powder which comprises a silicon layer that contains silicon, and transparent resin layers that are provided on both surfaces of the silicon layer, wherein the thickness of the silicon layer is 50 nm or more.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to flaky metallic color powder, metallic color paint, metallic color resin pellets, cosmetics, containers, interior and exterior members for vehicles, and a method for producing flaky metallic color powder. More specifically, the present invention relates to flaky metallic color powder, metallic color paint, metallic color resin pellets, cosmetics, containers, interior and exterior members for vehicles, and a method for producing flaky metallic color powder that can achieve metallic color development of various colors in a single layer.

Background Art

[0002] Conventionally, pigments for imparting metallic colors to various substrates have been studied. Patent Document 1 discloses a gold interference pigment that exhibits a gold interference color by providing at least one layer such as Fe2O3 on a flaky substrate having a green intrinsic interference color such as Al2O3.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the gold interference pigment described in Patent Document 1 is a pigment that exhibits a gold color due to so-called structural color (interference color). Therefore, the pigment described in Patent Document 1 cannot achieve gold color development unless two or more metal oxide layers having different refractive indices are laminated. Therefore, such a metallic color pigment based on structural color has a complicated structure of the pigment and a complicated manufacturing process by laminating a plurality of metal oxide layers.

[0005] The present invention has been made in view of such conventional inventions, and an object thereof is to provide a flaky metallic color powder, a metallic color paint, a metallic color resin pellet, cosmetics, a container, an interior and exterior member for a vehicle, and a method for producing the flaky metallic color powder that can achieve metallic color development of various colors with a single layer.

Means for Solving the Problems

[0006] As a result of intensive studies, the present inventor has found that a flaky metallic color powder in which a translucent resin layer is formed on both surfaces of a silicon layer and the thickness of the silicon layer is adjusted can solve the above problems, and has completed the present invention. That is, the flaky metallic color powder, metallic color paint, metallic color resin pellet, cosmetics, container, interior and exterior member for a vehicle, and method for producing the flaky metallic color powder of the present invention mainly include the following configurations.

[0007] (1) A flaky metallic color powder having a silicon layer containing silicon and a translucent resin layer provided on both surfaces of the silicon layer, wherein the thickness of the silicon layer is 50 nm or more.

[0008] According to such a configuration, the flaky metallic color powder can achieve metallic color development of various colors with a single layer.

[0009] (2) The flaky metallic color powder according to (1), wherein in the L*a*b* color space, the value of the chroma C* represented by the following formula (1) is 1.1 to 21. Chroma C* = (a* 2 + b* 2 ) 1 / 2 ···Formula (1)

[0010] According to such a configuration, the flaky metallic color powder has better chroma.

[0011] (3) In the L*a*b* color space, the ratio of the lightness L* to the chroma C* (L* / C*) of the flaky metallic color powder according to (1) or (2) is 41 or less.

[0012] According to such a configuration, the flaky metallic color powder has a better balance between lightness and chroma.

[0013] (4) A metallic color paint containing the flaky metallic color powder according to any one of (1) to (3), a resin, and a solvent.

[0014] According to such a configuration, the metallic color paint can achieve metallic color development in various colors.

[0015] (5) A metallic color resin pellet containing the flaky metallic color powder according to any one of (1) to (4) and a resin.

[0016] According to such a configuration, the metallic color resin pellet can achieve metallic color development in various colors.

[0017] (6) A cosmetic containing the flaky metallic color powder according to any one of (1) to (5).

[0018] According to such a configuration, the cosmetic can achieve metallic color development in various colors.

[0019] (7) A container containing the flaky metallic color powder according to any one of (1) to (5).

[0020] According to such a configuration, the container can achieve metallic color development in various colors.

[0021] (8) Interior and exterior members for vehicles containing the flaky metallic color powder according to any one of (1) to (5).

[0022] According to such a configuration, the interior and exterior members for vehicles can achieve metallic color development in various colors.

[0023] (9) A method for manufacturing flaky metallic color powder, which includes a laminate forming step and a peeling and pulverizing step. The laminate forming step is a step of forming a laminate on a substrate, and includes a preparation step of preparing the substrate, a first light-transmissive resin layer forming step of forming a first light-transmissive resin layer on the substrate, a silicon layer forming step of forming a silicon layer containing silicon on the first light-transmissive resin layer, and a second light-transmissive resin layer forming step of forming a second light-transmissive resin layer on the silicon layer. The peeling and pulverizing step includes a peeling step of peeling the laminate from the substrate and a pulverizing step of pulverizing the peeled laminate to obtain flaky metallic color powder.

[0024] According to such a configuration, flaky metallic color powder capable of achieving metallic color development in various colors with a single layer can be obtained.

Effects of the Invention

[0025] According to the present invention, it is possible to provide flaky metallic color powder, metallic color paint, metallic color resin pellets, cosmetics, containers, interior and exterior members for vehicles, and a method for manufacturing flaky metallic color powder that can achieve metallic color development in various colors with a single layer.

Embodiments for Carrying Out the Invention

[0026] <Flaky metallic color powder> The flaky metallic color powder according to an embodiment of the present invention has a silicon layer containing silicon and light-transmissive resin layers provided on both surfaces of the silicon layer. The thickness of the silicon layer is 50 nm or more. Each will be described below.

[0027] (Silicon layer) The silicon layer contains silicon (elemental silicon). The purity of the silicon is not particularly limited. For example, the purity of the silicon is preferably 95% by mass or more, more preferably 99% by mass or more, and even more preferably 99.9% by mass or more. When the purity of the silicon is within the above range, the flaky metallic color powder is likely to achieve various metallic color developments.

[0028] The silicon layer may contain other components as appropriate according to the purpose as long as the effects of the present embodiment are achieved. Also, the silicon layer may contain unavoidably included impurities.

[0029] The thickness of the silicon layer may be 50 nm or more. Also, the thickness of the silicon layer is preferably 1 μm or less, more preferably 500 nm or less, and even more preferably 300 nm or less. When the thickness of the silicon layer is less than 50 nm, the flaky metallic color powder is unlikely to develop a metallic color. Also, when the thickness of the silicon layer is 1 μm or less, the flaky metallic color powder is likely to obtain a desired color feeling. Note that the method for measuring the thickness of the silicon layer is not particularly limited. For example, the thickness of the silicon layer can be measured by physical film thickness using a cross-sectional SEM (S-4700 manufactured by Hitachi High-Technologies Corporation).

[0030] (Transparent resin layer) The transparent resin layer is a layer provided on both surfaces of the silicon layer. That is, the flaky metallic color powder is a laminate of a first transparent resin layer, a silicon layer, and a second transparent resin layer.

[0031] The resin constituting the first light-transmissive resin layer is not particularly limited. For example, the resin may be a urethane resin, a polyester resin, an acrylic resin, a siloxane resin, a vinyl acetate resin, a styrene resin, a butadiene resin, a styrene-butadiene resin, a vinyl chloride resin, an acrylic-styrene resin, an acrylic-silicone resin, a polyvinyl alcohol resin, a polyether resin, an alkyd resin, polypropylene, polyvinylpyrrolidone, or the like.

[0032] The resin constituting the second light-transmissive resin layer is not particularly limited. The resin constituting the second light-transmissive resin layer is the same as the resin constituting the above-described first light-transmissive resin layer.

[0033] The thickness of the first light-transmissive resin layer is not particularly limited. For example, the thickness of the first light-transmissive resin layer is preferably 0.05 μm or more, more preferably 0.1 μm or more, and even more preferably 0.3 μm or more. Also, the thickness of the first light-transmissive resin layer is preferably 2.0 μm or less, more preferably 1.5 μm or less, and even more preferably 1.0 μm or less. The same applies to the thickness of the second light-transmissive resin layer. When the thicknesses of the first light-transmissive resin layer and the second light-transmissive resin layer are within the above ranges, the flaky metallic color powder can easily exhibit the metallic color and the silicon layer can be sufficiently sandwiched. The method for measuring the thickness of the first light-transmissive resin layer is not particularly limited. For example, the thickness of the first light-transmissive resin layer can be measured by first measuring the thickness of the substrate using an electronic micrometer (dial thickness gauge, manufactured by Anritsu Corporation, KG3001A), then measuring the total thickness (thickness of the substrate + first light-transmissive resin layer) in the same manner, and calculating the difference. Examples of the method for measuring the thickness of the second light-transmissive resin layer are as follows. First, measure the thickness of (substrate + first light-transmissive resin layer + silicon layer) using the above electronic micrometer, and then measure the thickness of (substrate + first light-transmissive resin layer + silicon layer + second light-transmissive resin layer) using the above electronic micrometer. Then, the thickness of the second light-transmissive resin layer can be measured by calculating the difference.

[0034] The total light transmittance of the first light-transmitting resin layer is not particularly limited. For example, the total light transmittance is preferably 70% or more, more preferably 80% or more, and even more preferably 85% or more. The same applies to the total light transmittance of the second light-transmitting resin layer. When the total light transmittance is within the above range, the metallic feel of the silicone layer is not easily hindered by the flake-shaped metallic color powder. In this embodiment, the total light transmittance can be measured using NDH5000SP (manufactured by Nippon Denshoku Industries Co., Ltd.).

[0035] Returning to the explanation of the flake metallic color powder as a whole, the average particle size of the flake metallic color powder is preferably 3 μm or more, more preferably 5 μm or more, even more preferably 10 μm or more, and particularly preferably 15 μm or more. The average particle size of the flake metallic color powder is preferably 900 μm or less, more preferably 600 μm or less, even more preferably 450 μm or less, and particularly preferably 370 μm or less. By having the average particle size within the above range, the flake metallic color powder is likely to fully exhibit brilliance and is likely to obtain a smooth surface when applied.

[0036] In this embodiment, the term "flake-shaped" refers to a shape that is flaky, scaly, sheet-like, flat-plate-like, flat, or flattened. Flake-shaped powder means powder that has a substantially flat surface and a substantially uniform thickness in a direction perpendicular to the substantially flat surface. Further, flake-shaped powder means powder having a relatively small thickness and a relatively long length of the substantially flat surface. The length of the substantially flat surface is the diameter of a circle having the same projected area as the projected area of the flake-shaped powder. The shape of the substantially flat surface is not particularly limited and can be appropriately selected according to the purpose. For example, polygons such as substantially rectangular, substantially square, substantially circular, substantially elliptical, substantially triangular, substantially quadrilateral, substantially pentagonal, substantially hexagonal, substantially heptagonal, substantially octagonal, etc., and random irregular shapes can be mentioned. The average particle size can be measured by using a laser particle size distribution analyzer LMS-3000+MV manufactured by Seishin Enterprise Co., Ltd., and obtaining the cumulative 50% volume particle diameter (D50) with the flake-shaped powder added in ethanol at a solid content concentration of about 0.3 mass% to 10 mass%.

[0037] In addition, for flake-shaped metallic color powder, in the L*a*b* color space, it is preferable that the value of the chroma C* represented by the following formula (1) is 1.1 or more. When the chroma C* is within the above range, the flake-shaped metallic color powder has a more excellent chroma. Chroma C* = (a* 2 + b* 2 ) 1 / 2 ···Formula (1)

[0038] Note that the "reflected light in the L*a*b* color space" can all be obtained, for example, by measuring the reflected light on the powder using a spectrocolorimeter SD7000, a control unit CU-II, and color management software Color Mate Pro (manufactured by Nippon Denshoku Industries Co., Ltd.). At this time, the wavelength range can be 380 nm to 780 nm, the light source can be D65, the viewing angle can be 10°, and it can be conditioned to include the specular reflection component (SCI, Specular Component Include).

[0039] The flaky metallic color powder of the present embodiment preferably has a lightness L* value of reflected light in the L*a*b* color space of 40 or more. When the lightness L* value of the reflected light is within the above range, the flaky metallic color powder also improves the reflection lightness (reflectance). As a result, various metallic colors are likely to be exhibited in the laminated film.

[0040] In the L*a*b* color space, the flaky metallic color powder preferably has a ratio (L* / C*) of lightness L* to chroma C* of 41 or less. Further, the ratio (L* / C*) is preferably 1 or more. When the ratio (L* / C*) is within the above range, the flaky metallic color powder has a better balance between lightness and chroma.

[0041] As described above, the flaky metallic color powder of the present embodiment can realize metallic color development of various colors with a single layer.

[0042] <Manufacturing Method of Flaky Metallic Color Powder> The manufacturing method of the flaky metallic color powder according to an embodiment of the present invention includes a laminate forming step and a peeling and pulverizing step. The laminate forming step is a step of forming a laminate on a base material. The laminate forming step includes a preparation step of preparing a base material, a first light-transmissive resin layer forming step of forming a first light-transmissive resin layer on the base material, a silicon layer forming step of forming a silicon layer containing silicon on the first light-transmissive resin layer, and a second light-transmissive resin layer forming step of forming a second light-transmissive resin layer on the silicon layer. The peeling and pulverizing step includes a peeling step of peeling the laminate from the base material and a pulverizing step of pulverizing the peeled laminate to obtain flaky metallic color powder. Each will be described below.

[0043] (Laminate Forming Step) The laminate forming step is a step of forming a laminate on a substrate. The laminate forming step includes a preparation step of preparing a substrate, a first light-transmissive resin layer forming step of forming a first light-transmissive resin layer on the substrate, a silicon layer forming step of forming a silicon layer containing silicon on the first light-transmissive resin layer, and a second light-transmissive resin layer forming step of forming a second light-transmissive resin layer on the silicon layer.

[0044] · Preparation step First, a substrate is prepared. The substrate is not particularly limited as long as it has a smooth surface. For example, the substrate is a resin film, a metal foil, a composite film of a metal foil and a resin film, etc. having flexibility, heat resistance, solvent resistance, and dimensional stability. The resin film is a polyester film, a polyethylene film, a polypropylene film, a polystyrene film, a polyimide film, a polyamide film, a polycarbonate film, a triacetate film, etc. The metal foil is a copper foil, an aluminum foil, a nickel foil, an iron foil, an alloy foil, etc. The composite film of a metal foil and a resin film is a laminate of the above resin film and metal foil.

[0045] The thickness of the substrate is not particularly limited. For example, the thickness of the substrate is preferably 4 μm or more, more preferably 8 μm or more, and even more preferably 10 μm or more. Also, the thickness of the substrate is preferably 200 μm or less, more preferably 100 μm or less, and even more preferably 50 μm or less. When the thickness of the substrate is within the above range, the substrate has good handleability, has appropriate flexibility, and is easy to peel off.

[0046] · First light-transmissive resin layer forming step The first light-transmissive resin forming step is a step of forming a first light-transmissive resin layer on the substrate.

[0047] The method for forming the first light-transmissive resin layer on the substrate is not particularly limited. For example, the first light-transmissive resin layer can be formed by an inkjet method, a blade coating method, a gravure coating method, a gravure offset coating method, a bar coating method, a roll coating method, a knife coating method, an air knife coating method, a comma coating method, a U-comma coating method, an AKKU coating method, a smoothing coating method, a microgravure coating method, a reverse roll coating method, a four-roll coating method, a five-roll coating method, a dip coating method, a curtain coating method, a slide coating method, a die coating method, etc. Specifically, the first light-transmissive resin layer is formed by gravure coating a first light-transmissive resin diluted with a solvent and drying it. As the solvent, an alcohol-based solvent, a ketone-based solvent, etc. can be used. Specifically, MEK, IPA, n-butanol, ethanol, etc. can be used.

[0048] · Silicon layer forming step The silicon layer forming step is a step of forming a silicon layer containing silicon on the first light-transmissive resin layer.

[0049] The method for forming the silicon layer is not particularly limited. For example, the silicon layer can be formed by a dry coating method such as a conventionally known physical vapor deposition method such as a vacuum evaporation method, a sputtering method, an ion plating method, etc.

[0050] · Second light-transmissive resin layer forming step The second light-transmissive resin layer forming step is a step of forming a second light-transmissive resin layer on the silicon layer.

[0051] The method for forming the second light-transmissive resin layer on the silicon layer is not particularly limited. For example, the second light-transmissive resin layer can be formed by the same method as the above-described first light-transmissive resin layer. Specifically, the second light-transmissive resin layer is formed by gravure coating a second light-transmissive resin diluted with a solvent and drying it. As the solvent, an alcohol-based solvent, a ketone-based solvent, etc. can be used. Specifically, MEK, IPA, n-butanol, ethanol, etc. can be used.

[0052] Through the above steps, a laminate in which a first light-transmissive resin layer, a silicon layer, and a second light-transmissive resin layer are laminated on a substrate is formed.

[0053] (Peeling and grinding process) The peeling and grinding process includes a peeling process of peeling the laminate from the substrate and a grinding process of grinding the peeled laminate to obtain flaky metallic color powder.

[0054] ·Peeling process The peeling process is a process of peeling the laminate from the substrate.

[0055] ·Grinding process The grinding process is a process of grinding the peeled laminate to obtain flaky metallic color powder. The method of grinding the laminate is not particularly limited. For example, the grinding method is a method using a jet mill, a ball mill, a ring-roll mill, a hammer mill, a tube mill, etc. The grinding may be performed in water. In that case, a viscosity regulator such as alcohol, a drying accelerator, a sedimentation stabilizer, a surfactant, etc. may be used in combination. Note that even if the grinding is not actively performed, just peeling the laminate from the substrate may result in the laminate becoming fine flaky metallic color powder. Also, rough separation and / or classification may be performed simultaneously with the grinding.

[0056] Through the above steps, flaky metallic color powder is obtained. The flaky metallic color powder can realize metallic color development of various colors in a single layer.

[0057] <Metallic color paint> The metallic color paint according to an embodiment of the present invention includes the above-described flaky metallic color powder, a resin, and a solvent. Each will be described below.

[0058] ·Flaky metallic color powder The content of the flaky metallic color powder is not particularly limited. For example, the content of the flaky metallic color powder is preferably 0.05% by mass or more, more preferably 0.1% by mass or more in the metallic color paint. Further, the content of the flaky metallic color powder is preferably 10% by mass or less, more preferably 7% by mass or less in the metallic color paint. When the content of the flaky metallic color powder is within the above range, the flaky metallic color powder is likely to be uniformly dispersed, there is no sedimentation or aggregation, and a metallic color paint with excellent brightness can be easily obtained.

[0059] · Resin The resin is not particularly limited. For example, the resin is an alkyd resin, a polyurethane resin, an acrylic resin, a vinyl chloride resin, an epoxy resin, a fluororesin, or the like.

[0060] · Solvent The solvent is not particularly limited. For example, the solvent is a strong solvent such as toluene, xylene, ester, ketone, a weak solvent such as a terpene-based solvent, water, or the like.

[0061] · Additive In addition to the above, additives may be appropriately added to the metallic color paint. The additives are added for the purposes of preventing sagging of the metallic color paint, preventing precipitation during storage, preventing bubbles during painting and drying, and smoothing the surface during painting and drying.

[0062] The metallic color paint of the present embodiment can be prepared by mixing the flaky metallic color powder, the resin, and the solvent. The metallic color paint can achieve metallic color development in various colors.

[0063] <Metallic Color Resin Pellet> The metallic color resin pellet of one embodiment of the present invention contains the above-described flaky metallic color powder and the resin. Hereinafter, each will be described.

[0064] · Flaky metallic color powder The content of the flaky metallic color powder is not particularly limited. For example, the content of the flaky metallic color powder is preferably 0.01% by mass or more in the metallic color resin pellets. Also, the content of the flaky metallic color powder is preferably 10% by mass or less, more preferably 5% by mass or less, and even more preferably 1% by mass or less in the metallic color resin pellets. When the content of the flaky metallic color powder is within the above range, it is easy to obtain metallic color resin pellets with excellent luster.

[0065] · Resin The resin is not particularly limited. For example, the resin is the same as those described above in relation to the metallic color paint.

[0066] The content of the resin is not particularly limited. For example, the content of the resin is preferably 70% by mass or more, more preferably 85% by mass or more in the metallic color resin pellets. Also, the content of the resin is preferably 99.5% by mass or less, more preferably 99% by mass or less in the metallic color resin pellets. When the content of the resin is within the above range, it is easy to obtain metallic color resin pellets with excellent luster.

[0067] · Additive In addition to the above, additives may be appropriately added to the metallic color resin pellets. The additives are the same as those described above in relation to the metallic color paint.

[0068] The metallic color resin pellets of the present embodiment can be prepared by mixing flaky metallic color powder into molten resin, cutting it into appropriate shapes and sizes, and then cooling. The metallic color resin pellets can achieve metallic color development in various colors.

[0069] <Cosmetics> The cosmetics according to an embodiment of the present invention contain the above-described flaky metallic color powder. The cosmetics can achieve metallic color development in various colors.

[0070] The method for preparing the cosmetics is not particularly limited. For example, the cosmetics can be prepared by mixing the flaky metallic color powder of the above embodiment into cosmetic materials such as eyeshadow, foundation, and nail polish. Thereby, the obtained cosmetics can be imparted with a lamé feeling and glossiness, and the makeup effect can be improved. Further, the flaky metallic color powder of the present embodiment does not contain residual formaldehyde. Therefore, the flaky metallic color powder can also be used for applications where it is directly applied to the skin. Further, since the flaky metallic color powder has a small particle size and a smooth surface, there is no roughness or damage to the skin, and a good feeling of use can be obtained.

[0071] The content of the flaky metallic color powder in the cosmetics can be appropriately selected according to the purpose.

[0072] <Container> The container according to an embodiment of the present invention contains the above-described flaky metallic color powder. The container can achieve metallic color development in various colors.

[0073] The type of the container is not particularly limited. For example, as a cosmetic container, it can be a tube container, a compact container, etc. As containers for other uses, they can be cups, cans, bottles, boxes, bags, cases, baskets, bags, suitcases, containers, tanks, etc.

[0074] The manufacturing method of the container is not particularly limited. For example, the container can be produced by injection molding metallic color resin pellets. The obtained container can be imparted with a lamé feeling and glossiness.

[0075] The content of the flaky metallic color powder in the container can be appropriately selected according to the purpose.

[0076] <Interior and exterior vehicle components> The interior and exterior vehicle components according to an embodiment of the present invention contain the above-described flaky metallic color powder. The interior and exterior vehicle components can achieve metallic color development in various colors.

[0077] The type of the interior and exterior vehicle components is not particularly limited. For example, the interior and exterior vehicle components include instrument panel garnishes and ornaments, audio panels, auto air conditioner panels, steering ornaments, door trim ornaments, power window switch bezels, operating system knobs, switches and various caps or covers, radiator grills, pillar garnishes, back door ornaments, side mirror covers, outer panels, rear spoilers, inside or outside door handles, side visors, wheel covers, cowlings for two-wheeled motor vehicles, etc.

[0078] The manufacturing method of the interior and exterior vehicle components is not particularly limited. For example, the interior and exterior vehicle components can be produced by spray coating a resin added with metallic color powder on a target member. The obtained interior and exterior vehicle components can be imparted with a lamé feeling and glossiness.

[0079] The content of the flaky metallic color powder in the interior and exterior vehicle components can be appropriately selected according to the purpose.

Example

[0080] Hereinafter, the present invention will be described more specifically by way of examples. The present invention is not limited to these examples in any way. Unless otherwise specified, “%” means “mass %” and “part” means “part by mass”.

[0081] <Preliminary study on the thickness of the silicon layer for expressing a metallic color feeling> By the following method, a laminate was formed on a substrate, and without peeling and pulverizing, the thickness of the silicon layer for developing a metallic color was examined.

[0082] (Reference Example 1) A base material (20 μm thick) made of a polyester resin was prepared (base material preparation step). A first light-transmissive resin layer (1.0 μm thick) was formed by coating the base material with a bar coater and drying it (first light-transmissive resin layer formation step). Next, a silicon layer (36 nm thick) was formed on the first light-transmissive resin layer by vacuum deposition (silicon layer formation step). Further, a second light-transmissive resin layer (1.0 μm thick) was formed by coating the silicon layer with a bar coater and drying it (second light-transmissive resin layer formation step), and a vapor deposition film of Reference Example 1 in which a laminate (first light-transmissive resin layer / silicon layer / second light-transmissive resin layer) was formed on the base material was produced.

[0083] (Reference Examples 2 to 6) Vapor deposition films of Reference Examples 2 to 6 were produced in the same manner as in Reference Example 1, except that the thickness of the silicon layer was changed to the values shown in Table 1.

[0084] Visual evaluation was performed using the vapor deposition films of Reference Examples 1 to 6, and the thickness of the silicon layer required to develop a metallic color (gold tone) from the original color tone (silver tone) was evaluated. The results are shown in Table 1.

[0085]

Table 1

[0086] As shown in Table 1, it was confirmed that when the thickness of the silicon layer was 50 nm or more (Reference Examples 4 to 6), a metallic color (gold tone) was developed from the original color tone (silver tone). In addition, even when the base material was peeled off from the vapor deposition film and pulverized to produce flaky metallic color powder, it was confirmed that when the thickness of the silicon layer was 50 nm or more, a metallic color (gold tone) was developed from the original color tone (silver tone).

[0087] <Example 1> A substrate made of a polyester resin (thickness: 20 μm) was prepared (substrate preparation step). A first light-transmitting resin layer (thickness: 1.0 μm) was formed by coating the substrate with a bar coater and drying it (first light-transmitting resin layer formation step). Next, a silicon layer (thickness: 50 nm) was formed on the first light-transmitting resin layer by vacuum evaporation (silicon layer formation step). Further, a second light-transmitting resin layer (thickness: 1.0 μm) was formed by coating the silicon layer with a bar coater and drying it (second light-transmitting resin layer formation step), and a vapor-deposited film in which a laminate (first light-transmitting resin layer / silicon layer / second light-transmitting resin layer) was formed was produced on the substrate. The substrate was peeled off from the obtained vapor-deposited film (peeling step). Next, the laminate was pulverized by a ball mill to obtain flaky metallic color powder (dimension: 30 μm).

[0088] <Examples 2 to 8, Comparative Examples 1 to 2> Flaky metallic color powder was obtained in the same manner as in Example 1, except that the formulation described in Table 2 was changed.

[0089] The color tone of the obtained flaky metallic color powder was visually observed, and the optical properties were measured under the following conditions. The results are shown in Table 2. The chroma C* and hue angle h were calculated according to the following formulas. (Formula for calculating chroma C*) Chroma C* = (a* 2 + b* 2 ) 1 / 2 (Formula for calculating hue angle h) Hue angle h = tan -1 (b* / a*) (unit: °) (Distance from the origin in the L*a*b* color space) Distance from the origin = (L* 2 + a* 2 + b* 2 ) 1 / 2 (Measuring device, measurement conditions) Spectrophotometer SD7000, control unit CU-II, color management software Color Mate Pro Manufactured by Nippon Denshoku Industries Co., Ltd. Measure the reflected light of the powder · Wavelength range: 380 nm to 780 nm · Light source: D65 · Field of view angle: 10° · Include the specular reflection component (SCI, Specular Component Include)

[0090]

Table 2

[0091] As shown in Table 2, the flaky metallic color powder of the present invention can achieve metallic color development of various colors with a single layer.

Claims

1. A flaky metallic color powder having a silicon layer containing silicon and a translucent resin layer provided on both surfaces of the silicon layer. The thickness of the silicon layer is 50 nm or more.

2. The flaky metallic color powder according to Claim 1, wherein in the L*a*b* color space, the value of the chroma C* represented by the following formula (1) is 1.1 to 21. Chroma C* = (a* 2 + b* 2 ) 1 / 2 ... Equation (1)

3. The flaky metallic color powder according to Claim 1 or 2, wherein in the L*a*b* color space, the ratio (L* / C*) of the lightness L* to the chroma C* is 41 or less.

4. A metallic color paint containing the flaky metallic color powder according to Claim 1 or 2, a resin, and a solvent.

5. A metallic color resin pellet containing the flaky metallic color powder according to Claim 1 or 2 and a resin.

6. A cosmetic containing the flaky metallic color powder according to Claim 1 or 2.

7. A container containing the flaky metallic color powder according to Claim 1 or 2.

8. Interior and exterior members for vehicles containing the flaky metallic color powder according to Claim 1 or 2.

9. Having a laminate forming step and a peeling and pulverizing step. The laminate forming step is a step of forming a laminate on a substrate. A preparation step of preparing the substrate. A first translucent resin layer forming step of forming a first translucent resin layer on the substrate. A silicon layer forming step of forming a silicon layer containing silicon and having a thickness of 50 nm or more on the first translucent resin layer. Including a second translucent resin layer forming step of forming a second translucent resin layer on the silicon layer. The peeling and pulverizing step A peeling step of peeling the laminate from the substrate. A pulverizing step of pulverizing the peeled laminate to obtain a flaky metallic color powder, and a method for producing a flaky metallic color powder.

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