Method for producing coated pigment

Abstract

To provide a pigment which achieves smooth and preferable touch feeling on an application object, for example, which can achieve preferable spreadability on a skin of a user, when being used as cosmetics, such as foundation and eye shadow, and achieves preferable color development and luster.SOLUTION: A pigment is a coated pigment where a surface of a flaky base material formed of at least one kind of metal or metal oxide is coated with a color agent, and a coarse grain area ratio on the flaky base material surface is 9% or less. In addition, the flaky base material is preferably at least one kind selected from a group formed of, mica, aluminum, alumina, and glass.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a pigment and a cosmetic, ink, paint, toner, or molded product containing the pigment. [Background technology]

[0002] In the fields of cosmetics, inks, and paints, there has traditionally been a demand for products that have good color development and luster upon application, as well as excellent brightness, such as a sparkling feel. In particular, makeup cosmetics such as lipstick, eye shadow, blush, and nail polish are required to have uniform color development in order to enhance the finish achieved upon application to the skin. Furthermore, like pearls and metal surfaces, a sparkling feel is sometimes also required to strongly reflect light and create a more beautiful finish. In light of this, organic pigments and lustrous materials such as mica are used alone or in combination as pigment components in cosmetics, inks, paints, toners, and molded products.

[0003] For example, Patent Document 1 describes a flaky pigment having an average particle size of 5 to 60 μm, which is characterized by the formation of composite particles based on an ordered mixture by subjecting a mixture of a flaky substrate material consisting of flaky substrate particles with an aspect ratio of 10 to 120 and a pigment and / or dye consisting of particles with an average particle size of 5 μm or less to a high-speed stirring process without using a liquid medium.

[0004] Furthermore, Patent Document 2 describes a cosmetic characterized by blending at least one of a colored inorganic powder or a colored pearlescent pigment, in which Red No. 226 is firmly fixed to the surface of the inorganic powder or pearlescent pigment, into a cosmetic base. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 05-214257 [Patent Document 2] Japanese Patent Application Publication No. 169716 / 1983 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0006] The pigments described in Patent Documents 1 and 2 simply coat a flaky substrate material with a colorant, without giving any consideration to the condition of the pigment surface. With these conventional pigments, the colorant is not uniformly coated on the flaky substrate, resulting in significant surface irregularities. This reduces the slipperiness when the pigment is used in cosmetics and applied to the skin, resulting in uneven color. Therefore, there is a demand for coated pigments that are pleasant to the touch, spread well, and are less prone to uneven color.

[0007] The present invention aims to solve the problems associated with the coated pigments described above, and to provide a pigment that is pleasant to the touch and smooth when applied, spreads well on the skin when used in cosmetics such as foundation and eye shadow, and has good color development and luster. [Means for solving the problem]

[0008] As a result of extensive research, the present inventors have found that the above problems can be solved by controlling the coarse grain area ratio on the surface of the flaky substrate, and have thus completed the present invention.

[0009] That is, the present invention is "Item 1. A coated pigment in which the surface of a flaky substrate made of at least one metal or metal oxide is coated with a colorant, and the coarse particle area ratio on the surface of the flaky substrate is 9% or less. Item 2. The pigment according to Item 1, wherein the flaky substrate is at least one selected from the group consisting of mica, aluminum, alumina, and glass. Item 3. The pigment according to Item 1 or 2, wherein the colorant comprises at least one organic pigment. Item 4. The pigment according to any one of Items 1 to 3, wherein the surface of the flaky substrate is further coated with a layer containing at least one component selected from the group consisting of resins, metals, and metal oxides. Item 5. The pigment according to any one of Items 1 to 4, wherein the pigment is further coated with a layer containing at least one component selected from the group consisting of resins, metals, and metal oxides. Item 6. A cosmetic, ink, paint, toner, or molded product containing the pigment according to any one of items 1 to 5. [Effects of the Invention]

[0010] The pigment of the present invention has a pleasant and smooth feel when applied, spreads well when applied, and has good color development and luster. Therefore, when used as a cosmetic product such as foundation or eye shadow, it spreads well on the skin, has excellent color development and luster, and is also excellent in brightness, such as a sparkling feel. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is an SEM photograph of a coated pigment (1) in an example. [Figure 2] 1 is an SEM photograph of a coated pigment (7) in an example. [Figure 3] This is the black and white binarized image of Figure 1. [Figure 4] 1 is an SEM photograph showing an example of a pigment of the present invention (the frame in the photograph indicates an example of an area for calculating a coarse particle area ratio). DETAILED DESCRIPTION OF THE INVENTION

[0012] The present invention will be described in detail below.

[0013] [Pigment] The pigment of the present invention is a pigment in which the surface of a flaky substrate made of at least one metal or metal oxide is coated with a colorant, and the coarse particle area ratio on the substrate surface is 9% or less. Hereinafter, the pigment of the present invention will be referred to as a "coated pigment." In the present invention, "coated" does not only mean that the surface of the flaky substrate is completely covered, but also includes cases where only a portion of the surface is covered (e.g., "adhered").

[0014] The coated pigment has a coarse particle area ratio on the surface of 9% or less, preferably 6% or less, more preferably 5% or less, even more preferably 4% or less, and most preferably 3% or less. A coarse particle area ratio within this range can reduce the friction of the coated pigment itself or the surface of a coated product containing it, resulting in a smooth and pleasant feel. In the present invention, "coarse particles" refer to particles that are sufficiently smaller than the flaky substrate, such as particles with a major axis of about 0.01 μm to about 3 μm as observed with a scanning electron microscope, or particles that are about 0.05% to about 15% of the particle diameter of the flaky substrate. The coarse particle area ratio can be determined by observing the surface of one coated pigment with a scanning electron microscope and determining the proportion of the area of ​​coarse particles present on that surface.

[0015] (Flake base material) In coated pigments, the flaky substrate is made of at least one metal or metal oxide. Examples of metals include silicon (Si), iron (Fe), aluminum (Al), sodium (Na), calcium (Ca), magnesium (Mg), potassium (K), copper (Cu), manganese (Mn), titanium (Ti), silver (Ag), gold (Au), platinum (Pt), lead (Pb), chromium (Cr), tin (Sn), molybdenum (Mo), gallium (Ga), and indium (In). Examples of metal oxides include oxides of these metals.

[0016] Examples of the flaky substrate include mica, aluminum, alumina, glass, titanium dioxide, red iron oxide, iron oxide, yellow iron oxide, black iron oxide, zinc oxide, Prussian blue, ultramarine, chromium oxide, kaolin, clay, bentonite, bismuth oxychloride, zirconium oxide, and magnesium oxide. Among these, the flaky substrate is preferably at least one selected from the group consisting of mica, aluminum, alumina, and glass.

[0017] Examples of the mica include natural mica, synthetic mica, synthetic phlogopite, titanium mica, synthetic titanium mica, iron oxide-coated mica, iron oxide-coated synthetic mica, and chromium hydroxide mica. Examples of the aluminum (Al) include aluminum alone, as well as aluminum hydroxide, aluminum chloride, aluminum nitride, aluminum phosphate, and aluminum sulfate. The glass is generally a silicate glass containing silicon dioxide (SiO2) as a main component, and examples include soda-lime glass, lead glass, soda-lime glass, A-glass, C-glass, E-glass, borosilicate glass, and aluminosilicate glass. These flaky substrates may be used alone or in combination of two or more.

[0018] The size of the flaky substrate is, for example, 0.1 to 5 μm (preferably 0.2 to 3 μm) in thickness and, for example, 3 to 100 μm (preferably 5 to 50 μm) in length in the long side direction. The average aspect ratio (length / thickness ratio) of the flaky substrate is, for example, 10 to 200, preferably 20 to 150. When the size and average aspect ratio of the flaky substrate are within the above ranges, the coated pigment has a smooth feel and spreads well, and the coated pigment has good color development and luster. The average particle size of the flaky substrate is, for example, 3 to 100 μm, preferably 5 to 50 μm.

[0019] As the flaky substrate, commercially available products such as SunMICA (trademark, manufactured by SunChemical) and IRIODIN (registered trademark, manufactured by Merck) as mica particles, Glass Flake, Metashine, and Lumigran (all registered trademarks, manufactured by Nippon Sheet Glass Co., Ltd.) as glass particles, and Hydrolan (registered trademark, manufactured by Eckart Co., Ltd.) as aluminum particles can be used.

[0020] The content of the flaky substrate is, for example, 20 to 98% by mass, preferably 30 to 95% by mass, relative to the total amount of the coated pigment. The content of the flaky substrate is, for example, 30 to 2,000 parts by mass, preferably 50 to 1,500 parts by mass, and more preferably 100 to 1,000 parts by mass, relative to 100 parts by mass of the colorant. When the proportion of the flaky substrate is within the above range, the coated pigment has a smooth and pleasant feel when applied, good spreadability during application, and good color development and gloss.

[0021] The surface of the flaky substrate may be further coated with a layer containing at least one component selected from the group consisting of resins, metals, and metal oxides. For example, resins include acrylic resins, urethane resins, styrene resins, ether resins, and epoxy resins. Metals include silicon (Si), iron (Fe), aluminum (Al), sodium (Na), calcium (Ca), magnesium (Mg), potassium (K), copper (Cu), manganese (Mn), titanium (Ti), silver (Ag), gold (Au), platinum (Pt), lead (Pb), chromium (Cr), tin (Sn), molybdenum (Mo), gallium (Ga), and indium (In). Metal oxides include oxides of these metals.

[0022] As the flaky substrate, commercially available products may be used, such as "C80-1608 SunPURO Pearl Silver" (manufactured by SunChemical Co., Ltd.) and "Benda-Lutz MAXAL76044EC" (manufactured by SunChemical Co., Ltd.).

[0023] (coloring agent) The coated pigment preferably contains at least one organic pigment as the colorant. Examples of the organic pigment include azo-based, phthalocyanine-based, anthraquinone-based, perylene-based, perinone-based, quinacridone-based, thioindigo-based, dioxazine-based, isoindolinone-based, quinophthalone-based, azomethine-based, diketopyrrolopyrrole-based, and isoindoline-based pigments, such as Red No. 3, Red No. 104, Red No. 106, Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 223, Red No. 226, Red No. 227, Red No. 228, Red No. 230, Red No. 401, Red No. 405, Red No. 505, Orange No. 203, Orange No. 204, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow No. 401, Blue No. 1, Blue No. 404, and CI Pigment Red. 1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 14, 15, 16, 17, 21, 22, 23, 31, 32, 37, 38, 41, 47, 48, 48:1, 48:2, 48:3, 48:4, 49, 49:1, 49:2, 50:1, 52:1, 52:2, 53, 53:1, 53:2, 53:3, 57, 57:1, 57:2, 58:4 , 60, 63, 63:1, 63:2, 64, 64:1, 68, 69, 81, 81:1, 81:2, 81:3, 81:4, 83, 88, 90:1, 101, 101:1, 104, 108, 108:1, 109, 112, 113, 114 , 122, 123, 144, 146, 147, 149, 151, 166, 168, 169, 170, 172, 173, 174, 175, 176, 177, 178, 179, 181, 184, 185, 187, 188, 190, 193, 194, 200, 202, 206, 207, 208, 209, 210, 214, 216, 220, 221, 224, 230, 231, 232, 233 , 235, 236, 237, 238, 239, 242, 243, 245, 247, 249, 250, 251, 253, 254, 255, 256, 257, 258, 259, 260, 262, 2 63, 264, 265, 266, 267, 268, 269, 270, 271, 272, 273, 274, 275, 276, 277, 278, 279, 280, 281, 282, 283, 284 , 285, 286, 287, 291, 295, 296, CIPigment Blue 1, 1:2, 9, 14, 15, 15:1, 15:2, 15:3, 15:4, 15:6, 16, 17, 19, 25, 27, 28, 29, 33, 35, 36 , 56, 56:1, 60, 61, 61:1, 62, 63, 66, 67, 68, 71, 72, 73, 74, 75, 76, 78, 79, CIPigment Yellow 1, 2, 3, 4, 5, 10, 12, 13, 14, 15, 16, 17, 18, 24, 31, 32, 34, 35, 35:1, 36, 36:1, 37, 37:1, 40, 42, 43, 53, 55, 60, 61, 62, 63, 65, 73, 74, 77, 81, 83, 93, 94, 95, 97, 98, 100, 101, 104, 106, 108, 109, 110, 113, 114, 115, 116, 117, 118, 119 9, 120, 123, 126, 127, 128, 129, 139, 147, 150, 151, 152, 153, 154, 155, 156, 161, 162, 164, 166, 167, 168, 169, 17 0, 171, 172, 173, 174, 175, 176, 177, 179, 180, 181, 182, 185, 187, 188, 192, 193, 194, 196, 198, 199, 213, 214, CI Examples of organic pigments include C1 Pigment Violet 1, 1:1, 2, 2:2, 3, 3:1, 3:3, 5, 5:1, 14, 15, 16, 19, 23, 25, 27, 29, 31, 32, 37, 39, 42, 44, 47, 49, and 50, and C1 Pigment Green 1, 2, 4, 7, 8, 10, 13, 14, 15, 17, 18, 19, 26, 36, 37, 45, 48, 50, 51, 54, 55, 58, and 59. These organic pigments may be used alone or in combination of two or more types depending on the desired hue.

[0024] Natural pigments may also be used as colorants. Examples of natural pigments include carotenoids, anthocyanins, flavonoids, quinones, porphyrins, diketones, betacyanins, and azaphilones, such as β-carotene, norbixin, bixin, capsanthin, lutein, lycopene, crocin, crocetin, astaxanthin, cyanidin acylglucoside, cyanidin, peonidin aglycone, anidin glucoside, delphinidin glucoside, and an Other natural pigments that may be used include rosinin, shisonin, malonylshisonin, pelargonidin acylglucoside, cocoa polyphenols, apigeninidin, luteolinidin, polymerized proanthocyanidins, saflomin, carthamin, carminic acid, laccaic acid, chlorophyll, phycocyanin, curcumin, betanin, isobetanin, ankaflavin, monascorubrin, iridoid glycosides, ester hydrolysates of iridoid glycosides, and eumelanin. These natural pigments may be used alone or in combination depending on the desired hue.

[0025] The primary particle size of the colorant in the coated pigment is preferably 1.0 μm or less, more preferably 0.001 to 0.8 μm, and even more preferably 0.005 to 0.6 μm. When the primary particle size is within the above range, the coated pigment has a pleasant and smooth feel in the applied product, good spreadability during application, and good color development and gloss.

[0026] When the colorant in the coated pigment aggregates to form secondary particles, the particle size is preferably 0.005 to 2.0 μm, more preferably 0.01 to 1.0 μm. When the secondary particle size is within the above range, the coated pigment has a smooth and pleasant feel when applied, good spreadability when applied, and good color development and gloss.

[0027] The colorant in the coated pigment is preferably softer than the flaky substrate. The degree of softness can be measured by Mohs hardness. For example, the Mohs hardness of the flaky substrate is preferably 5.0 or more, and the Mohs hardness of the colorant is preferably 5.0 or less. When the Mohs hardness of the colorant is lower than that of the flaky substrate, a smoother coated pigment can be obtained, which has good spreadability during application and also good color development and gloss.

[0028] The content of the colorant in the coated pigment is, for example, 0.5 to 50% by mass, preferably 1.0 to 40% by mass, and more preferably 1.0 to 30% by mass, relative to the total amount of the coated pigment. The content of the colorant is, for example, 5 to 333 parts by mass, preferably 7 to 200 parts by mass, and more preferably 10 to 100 parts by mass, relative to 100 parts by mass of the flaky substrate. When the proportion of the flaky substrate is within the above range, the coated pigment has a pleasant, smooth feel in the applied product, good spreadability during application, and good color development and gloss.

[0029] The coated pigment may be further coated with a layer containing at least one component selected from the group consisting of resins, metals, and metal oxides. Examples of resins include acrylic resins, urethane resins, styrene resins, ether resins, and epoxy resins. Examples of metals include silicon (Si), iron (Fe), aluminum (Al), sodium (Na), calcium (Ca), magnesium (Mg), potassium (K), copper (Cu), manganese (Mn), titanium (Ti), silver (Ag), gold (Au), platinum (Pt), lead (Pb), chromium (Cr), tin (Sn), molybdenum (Mo), gallium (Ga), and indium (In). Examples of metal oxides include oxides of these metals.

[0030] (Other ingredients) The coated pigment may contain inorganic powders or organic powders as other components in addition to the flaky substrate and colorant. Examples of such inorganic powders include zirconium oxide, zinc oxide, cerium oxide, magnesium oxide, barium sulfate, calcium sulfate, magnesium sulfate, calcium carbonate, magnesium carbonate, talc, sericite, silicic acid, silicic acid anhydride, aluminum silicate, magnesium silicate, aluminum magnesium silicate, calcium silicate, barium silicate, strontium silicate, metal tungstate, hydroxyapatite, vermiculite, higilite, bentonite, montmorillonite, hectorite, zeolite, ceramic powder, dibasic calcium phosphate, alumina, aluminum hydroxide, boron nitride, and silica.

[0031] Examples of organic powders include polyamide powder, polyester powder, polyethylene powder, polypropylene powder, polystyrene powder, polyurethane powder, benzoguanamine powder, polymethylbenzoguanamine powder, tetrafluoroethylene powder, polymethyl methacrylate powder, cellulose powder, silk powder, nylon powder (nylon 12, nylon 6), styrene-acrylic acid copolymer powder, divinylbenzene-styrene copolymer powder, vinyl resin powder, urea resin powder, phenolic resin powder, fluororesin powder, silicone resin powder, acrylic resin powder, melamine resin powder, epoxy resin powder, polycarbonate resin powder, microcrystalline fiber powder, rice starch, lauroyl lysine, etc. When organic and inorganic powders are used, their content is, for example, 0.1 to 10% by mass, preferably 0.5 to 5% by mass, based on the total amount of the coated pigment.

[0032] The coated pigment may contain an oily base as another component for the purpose of stabilizing the dispersion of the colorant. Examples of such an oily base include waxes that are solid at room temperature (25°C) and liquid oily components that are liquid.

[0033] Examples of the waxes include vegetable waxes such as candelilla wax, carnauba wax, rice wax, Japan wax, and sunflower wax; animal waxes such as beeswax; mineral waxes such as ozokerite, ceresin, and microcrystalline wax; petroleum waxes such as solid paraffin; and synthetic waxes such as silicone wax and synthetic beeswax.

[0034] Examples of the liquid oily component include vegetable oils such as olive oil, castor oil, jojoba oil, macadamia nut oil, crab rose fruit oil, cocoa butter, and lanolin; animal oils such as horse oil, turtle oil, wild boar oil, mink oil, and shark oil; hydrocarbon oils such as petrolatum, liquid paraffin, isodecane, isododecane, octyldodecyl, diisostearyl malate, and hydrogenated polyisobutene; isotridecyl isononanoate, isopropyl isostearate, neopentyl glycol dicaprate, isotridecyl isononanoate, and glycerin diisostearate. Examples of suitable waxes and liquid oil components include ester oils such as glyceryl triisostearate, diisostearyl malate, octyldodecanol, and di(phytosteryl / 2-octyldodecyl) N-lauroyl-L-glutamate; silicone oils such as dimethylpolysiloxane and phenylmethylpolysiloxane; dimer acid esters, dimer diol derivatives, cholesterol fatty acid esters, phytosterol fatty acid esters, polyglycerin fatty acid esters, pentaerythritol fatty acid esters, and glyceryl tri-2-ethylhexanoate. The content of waxes and liquid oil components in the coated pigment is, for example, 0.1 to 10% by mass, and preferably 0.5 to 5% by mass, based on the total amount of the coated pigment.

[0035] [Method of manufacturing coated pigment] The method for producing the coated pigment can be, for example, a wet method, a gas phase method, or a solid phase method, as a method for coating the surface of a flaky substrate with a colorant. The wet method includes a method using chemical adsorption in a solvent, a gas phase method includes a method for directly coating the surface of the substrate using sublimation, and a solid phase method includes a method using a dry composite device. The above production methods may also use an adsorbent.

[0036] In a wet method for producing a coated pigment, for example, a flaky substrate whose surface has been treated with a carboxylic acid, a colorant, and an amine compound are mixed in an organic solvent, followed by filtration to obtain a coated pigment through acid-base chemisorption. The organic solvent used here is not limited as long as it does not dissolve the flaky substrate, and it does not matter whether it dissolves the colorant or not. The colorant is usually dissolved or dispersed in an organic solvent and brought into contact with the flaky substrate to be uniformly coated.

[0037] In a method for producing a coated pigment using the gas phase method, for example, the flaky substrate and colorant are placed in an evaporator, the temperature is raised and the pressure is reduced while the evaporator is rotated, and after maintaining the rotation for a certain period of time, the pressure is gradually lowered to normal while the evaporator is cooled to obtain the coated pigment. The colorant is sublimated by the temperature increase and pressure reduction, and the gaseous colorant is uniformly coated on the flaky substrate.

[0038] In a method for producing a coated pigment using a solid-phase method, for example, a colorant such as an organic pigment is premixed with a flaky substrate so that the colorant and the flaky substrate are uniformly present, and then the colorant and the flaky substrate are stirred using a dry particle compounding device or the like to apply compression, shear, and impact, causing the colorant to spread and adhere to the surface of the flaky substrate, thereby obtaining a coated pigment.

[0039] As a dry particle compositing device, a product name "Nobilta (registered trademark) NOB" (manufactured by Hosokawa Micron Corporation) can be preferably used. The stirring peripheral speed in the dry particle compositing device is, for example, 5 to 20 m / sec, preferably 10 to 20 m / sec (for example, 1000 to 5000 rpm, preferably 2000 to 4000 rpm). The stirring treatment time is, for example, 1 to 10 minutes, preferably 2 to 5 minutes. As a result of investigations by the present inventors, it was found that while conventional techniques (for example, the above-mentioned Patent Document 1) require a peripheral stirring speed of 30 m / s or more, a peripheral stirring speed of 30 m / s or more can result in excessive force being applied to the premixed composite material, causing the flaky substrate to crack from the edges and resulting in an unsmooth surface. In the present invention, by setting appropriate conditions, it is possible to obtain coated pigments with unprecedented surface smoothness.

[0040] [Cosmetics, ink, paint, toner, or molded products] The cosmetic, ink, paint, toner, or molded product of the present invention is not particularly limited as long as it contains a coated pigment. In addition to the coated pigment, general ingredients suitable for each application and purpose can be blended as appropriate.

[0041] Examples of the cosmetics include foundations (face colors, concealers, etc.), makeup bases (makeup bases, pre-makeup, etc.), face powders, lipsticks (lipstick, lip rouge, lip color, lip pencil, rouge paste, lip gloss, lip liner, etc.), eye makeup (eye shadow, eye color, eyeliner, eyebrow pencil, eyebrow pencil, eyebrow blush, mascara, eyelash cosmetics, etc.), cheek cosmetics (blush, cheek color, cheek rouge, etc.), nail cosmetics (nail enamel, nail polish, nail color, nail polish, pedicure, nail lacquer, top coat, base coat, etc.), and hair colorants (hair dye, hair color spray, hair color stick, color rinse, hair manicure, etc.).

[0042] The inks, particularly printing inks, include, for example, lithographic (offset) ink, letterpress ink, intaglio (gravure) ink, stencil (screen) ink, flexographic ink, UV-curable ink, water-based ink, oil-based ink, vegetable oil ink, newspaper ink, and inkjet ink.

[0043] Examples of the paint include powder paint, water-based (water-based) paint, epoxy resin paint, urethane resin paint, fluororesin paint, polyester resin paint, melamine resin paint, and synthetic resin paint such as acrylic resin paint.

[0044] The toner is a micro-sized powder made of electrostatically charged plastic particles to which color particles are attached, and is used in laser printers and copiers, and the coated pigment can be used as the color particles.

[0045] The molded product is made from a resin containing the coated pigment as a plastic colorant. The plastic colorant may be in the form of a masterbatch (MB), colored pellets, colored compounds, dry color, paste color, or liquid masterbatch. [Example]

[0046] The present invention will be described in more detail below using examples and comparative examples. In the description of these examples, "parts" means "parts by mass." The coated pigments of Examples 1-6 and Comparative Examples 1-4 and paint-drawing colored papers (samples) using the coated pigments were prepared by the following method, and further evaluated by the following method. The evaluation results are shown in Table 1.

[0047] [Example 1] 4.0 parts of commercially available Red No. 104 (C146623, manufactured by Sun Chemical) and 36.0 parts of titanium oxide-coated mica particles A (pink-tinged mica particles) were premixed. The mixture was then processed at 3000 rpm for 3 minutes using a dry particle compositer (product name "Nobilta (registered trademark) NOB", manufactured by Hosokawa Micron Corporation, using an 86 mm diameter blade), and then removed to obtain coated pigment (1). An SEM image of coated pigment (1) is shown in Figure 1.

[0048] 0.87 parts of the coated pigment (1) obtained above, 12.6 parts of Acrydic A-801-P (DIC Corporation), 3.9 parts of Desmodur N-75 (Sumika Covestro Urethane Co., Ltd.), 1.6 parts of xylene, and 1.0 part of ethyl acetate were blended and dispersed in a planetary mill for 3 minutes to prepare a coating composition (1). The resulting coating composition (1) was applied to black paper using a 10 mil applicator to obtain a coating paper (1).

[0049] [Example 2] The same procedure as in Example 1 was carried out, except that Red No. 104 in Example 1 was changed to Red No. 202 (C19-7720, manufactured by SunChemical) and mica particles A were changed to mica particles B (reddish mica particles) coated with titanium oxide, to obtain coated pigment (2) and paint-extracted color paper (2).

[0050] [Example 3] The same procedure as in Example 1 was carried out, except that 4.0 parts of Red No. 104 in Example 1 was changed to 5.5 parts of Blue No. 1 (C39-4433, manufactured by SunChemical), and mica particles A was changed to 34.5 parts of mica particles C (bluish mica particles) coated with titanium oxide, to obtain coated pigment (3) and paint-extractable color paper (3).

[0051] [Example 4] The same procedure as in Example 1 was carried out except that Red No. 104 in Example 1 was changed to a quinacridone pigment (FASTOGEN SUPER MAGENTA RTS, manufactured by DIC), to obtain a coated pigment (4) and a paint-extractable color paper (4).

[0052] [Example 5] The same procedure as in Example 1 was carried out, except that Red No. 104 in Example 1 was changed to a copper phthalocyanine pigment (FASTOGEN BLUE TGR-SD, manufactured by DIC, average particle size 0.05 μm) and mica particles A were changed to mica particles C coated with titanium oxide, to obtain a coated pigment (5) and a paint-extractable color paper (5).

[0053] [Example 6] The same procedure as in Example 1 was carried out, except that Red No. 104 in Example 1 was changed to a copper phthalocyanine pigment (BLUE CRUDE B-8 / LC, manufactured by DIC, average particle size 3 μm) and mica particles A were changed to mica particles C coated with titanium oxide, to obtain a coated pigment (6) and a paint-extractable color paper (6).

[0054] [Example 7] The same procedure as in Example 1 was carried out, except that mica particles A in Example 1 were replaced with aluminum particles coated with titanium oxide (MAXAL 76044EC, manufactured by SunChemical), and the mixture was treated at 3000 rpm for 10 minutes using a dry compounding device, to obtain a coated pigment (11) and a paint-extracted color paper (11).

[0055] [Example 8] The same procedures as in Example 1 were carried out, except that Red No. 104 in Example 1 was changed to Blue No. 1 (C39-4433, manufactured by SunChemical), mica particles A were changed to borosilicate glass particles coated with titanium oxide (Reflecks Dimensions Shimmering White G130Z, manufactured by Color & Effects Japan Co., Ltd.), and processing was carried out at 2000 rpm for 5 minutes using a dry particle composite device, thereby obtaining a coated pigment (12) and a paint-extractable color paper (12).

[0056] [Comparative Example 1] A coated pigment (7) and a paint-extractable color paper (7) were obtained in the same manner as in Example 1, except that Nobilta was replaced with AMS-MINI. An SEM image of the coated pigment (7) is shown in Figure 2.

[0057] Comparative Example 2 The same procedure as in Example 2 was carried out except that NOB-MINI was replaced with AMS-MINI and the treatment was carried out at 1500 rpm for 1 minute, to obtain coated pigment (8) and paint-extracted color paper (8).

[0058] Comparative Example 3 The same procedure as in Example 3 was carried out except that NOB-MINI was changed to AMS-MINI, to obtain coated pigment (9) and paint-extractable color paper (9).

[0059] Comparative Example 4 The same procedure as in Example 4 was carried out except that NOB-MINI was changed to AMS-MINI, to obtain a coated pigment (10) and a paint-extractable color paper (10).

[0060] Comparative Example 5 The same procedure as in Example 7 was carried out except that the dry particle compounding time was changed from 10 minutes to 3 minutes, to obtain a coated pigment (13) and a paint-extractable color paper (13).

[0061] Comparative Example 6 The same procedure as in Example 8 was carried out except that the rotation speed of the dry particle composite treatment was changed from 2000 rpm to 3000 rpm and the treatment time was changed from 5 minutes to 1 minute, and a coated pigment (14) and a paint-extracted color paper (14) were obtained.

[0062] [Evaluation: Calculation method for coarse grain area ratio] Images were taken at 10,000x magnification using a scanning electron microscope (VE-7800, KEYENCE Corporation) so that only the surface of the coated pigment was visible. Using image processing software (ImageJ), the image was binarized by adjusting the threshold so that coarse particles could be recognized, and the area ratio of coarse particles in the region excluding 5% of the image on the top, bottom, left, and right was calculated. The same process was repeated for 10 images per type of coated pigment, and the average value was taken as the coarse particle area ratio. For example, when the coated pigment (1) of Example 1 was binarized into black and white, the result was as shown in Figure 3.

[0063] [Evaluation: MIU measurement] Using a friction tester (KES-SE; Kato Tech Co., Ltd.), the sensor was placed on a sample spread on a sample stage and slid to measure the friction coefficient MIU value. Data from the initial 5 mm and final 5 mm were cut and data from the 20 mm interval was used. The smaller the MIU value, the smoother the feel.

[0064] [Evaluation: Measurement of brightness intensity] The resulting paint application color paper was measured at three points using a multi-angle colorimeter (BYK-maci), and the average value of the Si value (brilliance intensity) at 45° was obtained.

[0065] [Table 1]

[0066] When comparing Example 1 and Comparative Example 1, Example 2 and Comparative Example 2, Example 3 and Comparative Example 3, Example 4 and Comparative Example 4, Example 7 and Comparative Example 5, and Example 8 and Comparative Example 6, which use the exact same colorant, it is clear that the Examples, which have a lower coarse particle area ratio, have a lower MIU average value and a better feel to the touch. Furthermore, compared to the Comparative Examples, the Examples have Si values ​​equal to or greater than those of the Comparative Examples, demonstrating that the glittering feel indicated by the brilliance intensity has been maintained or improved. Furthermore, when observing the pigment surfaces of Example 1 (coated pigment (1); Figure 1) and Comparative Example 1 (coated pigment (7); Figure 2) using enlarged SEM images, it is clear that the surface in Figure 1 is significantly smoother and contains fewer coarse particles than in Figure 2.

[0067] Although Example 5 and Example 6 have different primary particle diameters, they can provide a sufficiently low MIU average value and a high Si value.

Claims

1. 1. A method for producing a coated pigment in which a surface of a flaky substrate made of at least one metal or metal oxide is coated with a colorant, the method comprising the steps of: The flaky base material and the colorant are mixed using a dry particle composite device at a stirring peripheral speed of 9 to 20 m / sec, the flaky substrate is at least one selected from the group consisting of mica coated with titanium oxide and alumina coated with titanium oxide, The colorant contains at least one organic pigment, the organic pigment is selected from the group consisting of anthraquinones, perylenes, perinones, quinacridones, dioxazines, isoindolinones, quinophthalones, azomethines, diketopyrrolopyrroles, isoindolines, Red No. 3, Red No. 104, Red No. 106, Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 223, Red No. 227, Red No. 228, Red No. 230, Red No. 401, Red No. 405, Red No. 505, Orange No. 203, Orange No. 204, Orange No. 205, Yellow No. 4, Yellow No. 5, and Blue No. 1; the coarse particle area ratio on the surface of the flaky substrate in the coated pigment is 9% or less; The coarse particle area ratio was determined by taking an image at a magnification of 10,000 times using a scanning electron microscope so that only the surface of the coated pigment was shown, and then using image processing software to adjust the threshold value so that the image could be recognized as coarse particles and binarizing it, and calculating the area ratio occupied by coarse particles in a region excluding 5% of the image on the top, bottom, left, and right sides. The same processing was carried out on 10 images for each type of coated pigment, and the average value was taken as the coarse particle area ratio. The method for producing a coated pigment, wherein the coarse particles have a major axis of 0.01 μm to 3 μm when observed with a scanning electron microscope.

2. 2. The method for producing a coated pigment according to claim 1, wherein the flaky substrate has a Mohs hardness of 5.0 or more and / or the colorant has a Mohs hardness of 5.0 or less.

3. 3. The method for producing a coated pigment according to claim 1 or 2, wherein the colorant and the flaky substrate are agitated to apply compression, shear, and impact, thereby spreading and fixing the colorant to the surface of the flaky substrate, thereby obtaining a coated pigment.

4. The method for producing a coated pigment according to any one of claims 1 to 3, wherein the dry particle compositing apparatus is Nobilta (registered trademark) NOB.

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