Composite Pigments and Their Manufacturing Methods

Abstract

A composite pigment comprising a substrate and a pigment covering the surface of the substrate, wherein the pigment comprises an organic pigment, and when the dispersion obtained by dispersing 0.05 g of the composite pigment in 20 mL of ethyl acetate is allowed to stand for 24 hours to separate into a precipitate and a supernatant, the absorbance of the supernatant at the maximum absorption wavelength is less than 0.15.

Description

Technical Field

[0001] This disclosure relates to composite pigments and methods for manufacturing the same. Background Technology

[0002] In the fields of cosmetics, inks, and coatings, materials with excellent color rendering, gloss, and brightness during application have always been required. This is especially true in color cosmetics such as lipsticks, eyeshadows, blushes, and nail polish, where even color rendering is essential to enhance the makeup effect on the skin. Against this backdrop, composite pigments, which combine a base material (such as glossy materials like mica) with pigments (such as organic pigments), are used in the cosmetics, inks, and coatings industries.

[0003] For example, Patent Document 1 describes a flake-like pigment with an average particle size of 5 to 60 μm, characterized in that a mixture of a flake-like matrix material composed of flake-like matrix particles with an aspect ratio of 10 to 120 and a pigment and / or dye composed of particles with an average particle size of less than 5 μm is subjected to high-speed stirring without using a liquid medium, thereby forming composite particles based on an ordered mixture.

[0004] In recent years, dry particle composite devices have been used as equipment for composited substrates and pigments.

[0005] For example, Patent Document 2 discloses the following processing apparatus: a processing apparatus comprising a rotating shaft having a plurality of stirring members disposed on its outer periphery and a housing having an inner periphery located at a position separated from the stirring members by a small gap; the processing material inside the housing is stirred by the stirring members, which move with the rotation of the rotating shaft; wherein, viewed from a direction orthogonal to the axial direction of the rotating shaft, the end positions of each of the plurality of stirring members in a direction parallel to the axial direction of the rotating shaft are located further inside than the end positions of adjacent stirring members; another processing apparatus comprising a rotating shaft having a plurality of stirring members disposed on its outer periphery and a housing having an inner periphery located at a position separated from the stirring members by a small gap; the processing material inside the housing is stirred by the stirring members, which move with the rotation of the rotating shaft; wherein the diameter of the inner periphery of the housing is less than twice the diameter of the outer periphery of the rotating shaft.

[0006] The device described in Patent Document 2, for example, has Figures 1-3 The structure shown. Regarding... Figures 1-3 The device with the structure shown is described in Patent Document 2 as follows.

[0007] "This device has a rotating shaft 2 at the center of a cylindrical shell 1 enclosed by an outer skin 4, with multiple stirring members 3 on its outer periphery. The shell 1 is configured to have an inner periphery located at a position separated from the stirring members 3 by a small gap (interval), and the material to be processed inside the shell 1 is stirred by the stirring members 3, which move with the rotation of the rotating shaft 2. The rotating shaft 2 is supported on one side by a bearing 7 and connected to a drive unit 8, such as a motor. The raw material inlet 5 is located on the end side or upper part of the shell 1, and the product outlet 6 is located on the lower part of the shell 1 at the end opposite to the powder inlet 5. That is, the rotating shaft 2 is only axially located on one end side ( Figure 1 The housing 1 is formed only on one end of the axial direction of the rotating shaft 2 (left side). Figure 1 The middle is on the left side) and on the other end ( Figure 1 The right side of the middle section is a closed, bottomed cylindrical structure configured to operate in the processing space 9 between the cover and the rotating shaft 2. Figure 1 The position) and the non-working position (not shown) that does not cover the processing space 9 can be moved along the axis of rotation 2. "(Paragraphs

[0039] ,

[0040] ")

[0008] “The outer periphery of the rotating shaft 2 is provided with plate-shaped stirring members 3a and 3b at an angle inclined relative to the axial direction, and the two end portions 2a of the rotating shaft 2 are provided with diffusion members 10.” (

[0043] paragraph)

[0009] "like Figure 2 As shown, when viewing the rotation axis 2 of this device from a position orthogonal to the axial direction, for example, the end position of the stirring member 3b (2) in the direction parallel to the axial direction of the rotation axis 2 is located inside the other stirring members 3a (1) and 3a (3) compared to their end positions. In other words, when extension lines L1 and L3 are drawn vertically from the end of the stirring member 3b (2), it is in a positional relationship that partially overlaps with the adjacent stirring members 3a (1) and 3a (3). The other stirring members 3a (1), 3a (3), 3b (4), 3a (5), and 3b (6) are also in the same positional relationship. When the stirring members 3a and 3b are in such a positional relationship, the powder penetrates deeply into the inner side of the other adjacent stirring members 3a and 3b from the ends of the stirring members 3a and 3b, resulting in the force of the stirring members being strongly transmitted to the powder. "(Paragraph

[0044] )

[0010] "In this device, such as Figure 3 As shown, the diameter D1 of the inner circumference of the housing 1 is less than twice the diameter D2 of the outer circumference of the rotating shaft 2. That is, it is expressed as D1 ≤ D2 × 2. Figure 3In the example shown, D1 is 1.8 times D2. By making D2 relatively large, the space (processing space) 9 where the force acts on the powder can be limited. As a result, even with the same circumferential speed of the stirring members 3a and 3b, the force of the stirring members 3a and 3b can be strongly transmitted to the powder. If D1 exceeds twice D2, the space 9 where the force acts on the processed material becomes too large, and therefore the force applied to the powder will be smaller. "(Paragraph

[0045] )

[0011] "At least a portion of the aforementioned plurality of stirring components 3a and 3b is formed on the conveying stirring component 3a, which conveys the processed material in one direction along the axial direction of the rotating shaft 2 as the rotating shaft 2 rotates. Another portion of the aforementioned plurality of stirring components 3a and 3b is formed on the return stirring component 3b, which returns the processed material in another direction along the axial direction of the rotating shaft 2 as the rotating shaft 2 rotates." (

[0046] paragraph)

[0012] "like Figure 2 As shown, the plate surface of the conveying stirring member 3a is inclined towards the conveying direction, that is, inclined in a way that conveys the powder in one direction along the axial direction of the rotating shaft 2 as it rotates. This is in the case where the raw material inlet 5 and the product outlet 6 are located at both ends of the housing 1. Figure 1 In the case of raw material inlet 5, the direction will be from the raw material inlet 5 toward the powder outlet 6. Figure 2 The direction to the right (center) is called the conveying direction. On the other hand, the plate surface of the return stirring member 3b is inclined towards the return direction, that is, it is inclined in such a way that the powder returns in the opposite direction to the axial conveying direction of the rotating shaft 2 as the rotating shaft 2 rotates. In the case where the raw material inlet 5 and the product outlet 6 are provided at both ends of the shell 1 ( Figure 1 In the case of (the situation), the flow will be directed from the product outlet 6 towards the raw material inlet 5. Figure 2 The direction to the left (center) is called the return direction. The tilt angle of the stirring components 3a and 3b is preferably set in the range of ±5 to ±85 degrees relative to the axial direction of the rotation axis 2. (

[0047] paragraph)

[0013] "In stirring components 3a and 3b, multiple components arranged at intervals along the circumference of the rotation axis 2 form a group. It should be noted that the designations (1), (2), (3), etc., following 3a and 3b distinguish the different groups of stirring components 3a and 3b." Figure 2 In this configuration, the stirring components 3a and 3b within the same group are inclined relative to the rotation axis 2 to guide the powder in the same direction, either the conveying direction or the return direction, but not limited to this. Additionally, in Figure 2In the process, the stirring components 3a and 3b are arranged in a group of two components at a 180-degree interval on the rotation shaft 2. However, they can also be arranged in a group of multiple components, that is, in a group of three components at a 120-degree interval or in a group of four components at a 90-degree interval. "(

[0048] paragraph)

[0014] "One of the adjacent stirring members 3a and 3b in the circumferential direction of the rotating shaft 2 is formed in the aforementioned conveying stirring member 3a, and the other 3b is formed in the aforementioned return stirring member 3b. Specifically, as..." Figure 3 As shown, of the adjacent stirring members 3a (5) and 3b (6) in the circumferential direction of the rotation shaft 2, one 3a (5) is formed in the aforementioned conveying stirring member 3a, and the other 3b (6) is formed in the aforementioned return stirring member 3b. It should be noted that each group of stirring members 3a and 3b is preferably arranged so that, when viewed from the direction of the rotation shaft, it is offset by a certain angle from the other group of stirring members 3a and 3b adjacent in the axial direction of the rotation shaft 2. Figure 3 They are offset at a 90-degree angle, but are not limited to that angle. (

[0049] paragraph)

[0015] "The conveying stirring member 3a and the return stirring member 3b in..." Figure 2 Three sets of materials are alternately arranged along the axial direction of the rotating shaft 2, for a total of six sets. In this case, the powder is alternately subjected to a force of "conveyance → return → conveyance → return → conveyance → return". Compared with the case where the powder is subjected to a force in only one direction, the movement path of the powder in the shell is more complex and longer. As a result, the powder is subjected to a stronger force from the stirring components 3a and 3b. "(Section

[0050] ")

[0016] "exist Figure 2 …(omitted)…in which the tilt angles of the conveying stirring member 3a…(omitted)…or the return stirring member 3b…(omitted)…are the same, but are not limited to this. The tilt angles of the stirring members 3a and 3b may be completely different, or only some of the tilt angles may be different. (

[0051] paragraph)

[0017] "The stirring components 3a and 3b are plate-shaped. By making the stirring components 3a and 3b plate-shaped, the overall weight of the rotating shaft 2 can be reduced compared to the block-shaped stirring components. Therefore, it is possible to design a rotating shaft 2 that rotates at a higher speed. As a result, the force of the stirring components 3a and 3b can be transmitted to the powder more strongly. It should be noted that for the plate shape, it is sufficient that at least the part of the stirring components 3a and 3b near the inner periphery of the shell 1 is plate-shaped. The rotating shaft 2 can also be connected to the stirring components 3a and 3b by a rod-shaped arm or the like." (

[0052] paragraph)

[0018] "The gap (interval) between the inner periphery of the shell 1 and the stirring member 3 is preferably kept constant and small. Keeping the gap constant is to apply force uniformly to the powder, and keeping it small is to apply a stronger force by reducing the escape sites of the powder. As stirring members 3a and 3b, if a simple rectangular plate-shaped member is provided on the rotation shaft 2 when viewed from a direction intersecting the axial direction, the gap between the central part of the plate-shaped member and the inner periphery of the shell 1 will be larger than the two ends of the plate-shaped member. Therefore, it is preferable to keep the gap constant with consideration of the shape of the inner periphery side of the shell 1 of the stirring members 3a and 3b. However, the gap between the inner periphery of the shell 1 and one set of stirring members 3 and the gap between the inner periphery and another set of stirring members 3 do not need to be the same. For example, it may also be set such that..." Figure 2 The gap between the stirring member 3a(1) near the conveying base end of the raw material inlet 5 and the gap between the stirring member 3a(5) near the conveying terminal end of the product outlet 6 is wider. Furthermore, the gap width is preferably 0.05 to 7.5% of the diameter D1 of the inner circumference of the shell, and more preferably 0.75 to 3%. If it exceeds 7.5%, the escape area of ​​the powder becomes larger, making it impossible to impart a strong force. In a gap of less than 0.05%, the stirring members 3a and 3b may come into contact with the shell 1 due to vibrations generated during operation. Specifically, the gap between the inner circumference of the shell 1 and the stirring members 3a and 3b is preferably set in the range of 0.3 mm to 50 mm. (Paragraphs

[0053] and

[0054] )

[0019] "In order to ensure that the processed material is effectively stirred within the housing 1, it is preferable to set the input volume of the processed material relative to 100% of the internal volume of the processing space 9 within the housing 1 within a range of 5% to 95% of the lower limit. Here, the internal volume of the processing space 9 within the housing 1 refers to the volume of the space (the actual space within the housing 1 where the processed material can move freely) obtained by subtracting the volume occupied by the rotating shaft 2 from the internal volume of the housing 1 itself." (

[0055] paragraph)

[0020] "The two ends of the rotating shaft 2 are areas where the action of the stirring members 3a and 3b is not easily affected. Therefore, by providing a conveying stirring member 3a at one end of the rotating shaft 2 and a return stirring member 3b at the other end, it is possible to suppress the movement of powder towards the two ends of the rotating shaft 2. As a result, it is possible to prevent the discharge of powder without being subjected to strong stirring action based on the stirring members 3. That is, at one end located in the axial direction of the aforementioned rotating shaft 2 ( Figure 2 …(omitted)…the left end) of the stirring member 3a(1) is formed from one end of the axis to the other end ( Figure 2 …(omitted)…the right end of the conveying and processing agitation member 3a, located at the other end of the axial direction of the aforementioned rotating shaft 2 ( Figure 2…(omitted)…the right end) of the stirring members 3b(5), 3b(6) are formed for returning the processed material from the other end of the axis to one end. (

[0057] paragraph)

[0021] "In fact, the stirring components 3a and 3b are configured as follows: in a cross-sectional view viewed from the axial direction of the aforementioned rotation axis 2, ... (omitted) ... the front end portions of the stirring components 3a and 3b, which are opposite to the inner circumference of the housing 1, are formed into acute angle shapes, and the center line L of the acute angle portion of the front end is arranged to be inclined at a right angle relative to the inner circumferential surface of the housing 1. ... (omitted) ... the angle of the aforementioned acute angle portion of the front end is not limited to 60 degrees, and can be set to any angle from close to 90 degrees to less than 60 degrees. However, considering the wear of the front end portion, a small angle is not preferred. In addition, the inclination angle of the aforementioned center line L can also be set to an appropriate value." (

[0058] paragraph)

[0022] "Diffusion members 10 are provided at both ends 2a of the rotating shaft 2. By moving the diffusion members 10 with the rotation of the rotating shaft 2, centrifugal force is generated by the diffusion members 10 to suppress the movement of powder towards the ends 2a, which are difficult to reach by the stirring member 3. As a result, it is possible to prevent the discharge of powder without the strong stirring action of the stirring member 3." Figure 3 As shown, the diffusion member 10 is composed of two plate-shaped members extending in opposite directions from the center of the rotation shaft 2 at each end face 2a. Furthermore, as shown by the solid and dashed lines, the stirring members 10 at both end faces 2a are arranged to be offset from each other by 90 degrees in the axial view of the rotation shaft 2. However, this is not a limitation; other shapes, angles, and numbers are possible as long as centrifugal force can be generated. The diffusion member can also be arranged in a form that traverses the center of the rotation shaft 2 when viewed axially from the rotation shaft 2. Additionally, the diffusion member 10 may be provided only at one end face 2a of the rotation shaft 2, but it is preferable to provide it at both end faces 2a. (

[0060] paragraph)

[0023] Existing technical documents

[0024] Patent documents

[0025] Patent Document 1: Japanese Patent Application Publication No. 05-214257

[0026] Patent Document 2: Japanese Patent Application Publication No. 2005-270955 Summary of the Invention

[0027] The problem that the invention aims to solve

[0028] One common skin problem caused by cosmetics is pigmentation. Furthermore, there is a concern that composite pigments coated on substrates with organic pigments can cause pigmentation when used in cosmetics.

[0029] Therefore, the object of this disclosure is to provide a composite pigment that is not prone to causing pigmentation on the skin when used as a cosmetic, and a method for manufacturing the same.

[0030] Methods for solving problems

[0031] The inventors of this disclosure discovered that the above-mentioned problems can be solved by using composite pigments with specific exudation properties, thus completing this disclosure.

[0032] Several aspects of the present invention are provided below [1] to [7].

[0033] [1] A composite pigment comprising a substrate and a pigment covering the surface of the substrate, wherein the pigment comprises an organic pigment, and when 0.05 g of the composite pigment is dispersed in 20 mL of ethyl acetate and the resulting dispersion is allowed to stand for 24 hours to separate into a precipitate and a supernatant, the absorbance of the supernatant at the maximum absorption wavelength is 0.15 or less.

[0034] [2] According to the composite pigment described in [1], the strong coating rate is 80% or more.

[0035] [3] According to [1] or [2], the composite pigment is composited with the substrate and the pigment by mechanochemical treatment.

[0036] [4] The composite pigment according to any one of [1] to [3], wherein the substrate is a sheet-like substrate comprising at least one selected from the group consisting of mica, aluminum, alumina and glass.

[0037] [5] The composite pigment according to any one of [1] to [4], wherein the substrate has a core and a shell covering the surface of the core, the shell comprising at least one selected from the group consisting of resin, metal and metal oxide.

[0038] [6] A method for manufacturing a composite pigment, the composite pigment comprising a substrate and a pigment covering the surface of the substrate, the manufacturing method comprising a coating step of using a dry particle composite apparatus to composite the substrate with the pigment comprising an organic pigment, thereby coating the surface of the substrate with the pigment; wherein the load power consumed by the dry particle composite apparatus in the coating step is set as P1, the load power consumed by the dry particle composite apparatus when the coating step is performed in a state of removing raw materials is set as P2, and the mass of the raw materials used in the coating step is set as m, (P1-P2) / m is 0.2~0.5 W·h / g.

[0039] [7] According to the method for manufacturing composite pigments described in [6], in the particle size distribution of the above pigments based on volume by wet laser diffraction scattering method, when the particle size at which the cumulative value from the small particle size reaches 10% and 90% of the whole is set as D10 and D90 respectively, D90-D10 is less than 300 μm.

[0040] Invention Effects

[0041] According to this disclosure, a composite pigment that is unlikely to cause pigmentation on the skin when used as a cosmetic, and a method for manufacturing the same, can be provided. Attached Figure Description

[0042] Figure 1 This is a partial front cross-sectional view showing the structure of the processing device of the invention described in Patent Document 2.

[0043] Figure 2 It means Figure 1 A diagram of the rotating shaft and stirring components in the processing device.

[0044] Figure 3 This is a side cross-sectional view showing the structure of the processing device of the invention described in Patent Document 2. Detailed Implementation

[0045] In this specification, the numerical range represented by "~" indicates the range in which the values ​​before and after the "~" are respectively the minimum and maximum values. Furthermore, unless specifically stated otherwise, the units of the values ​​before and after the "~" are the same. Additionally, the upper or lower limit of the numerical range described in this specification can be replaced with the values ​​shown in the embodiments. Furthermore, the separately stated upper and lower limits can be arbitrarily combined. Furthermore, "A or B" may include either A or B, or both.

[0046] The following describes exemplary embodiments of the present disclosure. However, the present disclosure is not limited to any of the embodiments described below.

[0047] <Composite Pigments>

[0048] One embodiment of this disclosure is a composite pigment having a substrate and a pigment (hereinafter also referred to as "coated pigment") covering the surface of the substrate. The coated pigment comprises an organic pigment. When 0.05 g of the composite pigment is dispersed in 20 mL of ethyl acetate and the resulting dispersion is allowed to stand for 24 hours to separate into a precipitate and a supernatant, the absorbance of the supernatant at the maximum absorption wavelength (hereinafter referred to as "absorbance A") is 0.15 or less.

[0049] Composite pigments possessing the above-mentioned characteristics are less likely to cause pigmentation on the skin when used in cosmetics. In other words, composite pigments with the above-mentioned characteristics can be said to have excellent resistance to pigmentation. Therefore, the above-mentioned composite pigments are preferably used as pigments in cosmetics. The resistance to pigmentation of composite pigments can be evaluated by the following methods.

[0050] Apply a composite pigment (approximately 50 mg) to a 5 mm × 5 mm area of ​​a 100 × 100 mm polyurethane No. 132 series (No. 132#W, manufactured by BEAULAX) bio-skin plate and spread it with your finger. Gently blow away excess pigment with air, and place an appropriate amount (approximately 0.1 g) of makeup remover oil (e.g., Deve OLIVE & ARGAN, BEAUTY PRODUCTS Co., Ltd.) on the pigment-coated area. Rub the pigment-coated area with your finger for 2 seconds, then wipe off the oil with a wiping paper to clean the pigment-coated area. Measure the color of the cleaned pigment-coated area using a colorimeter (e.g., eXact Advanced (x-rite)) (light source: D50, standard observer: 2°). In the obtained colorimetric data, the smaller the C* value, the more flawless the surface, and the better the resistance to pigmentation.

[0051] The C* value of the composite pigment measured by the above method is, for example, 3.0 or less, and can also be reduced to about 0.0. That is, the C* value of the composite pigment measured by the above method can be, for example, 0.0 to 3.0 or 0.9 to 3.0.

[0052] The reason for the above effect is not yet clear, but it is speculated as follows.

[0053] Firstly, one reason for skin pigmentation when using composite pigments in cosmetics can be the leaching of pigment components (such as organic pigments) from the composite pigment. In this regard, the absorbance A indirectly indicates the amount of pigment components (such as organic pigments) leaching from the composite pigment into the dispersion. It can be said that the lower the absorbance A, the less likely the composite pigment is to leach, exhibiting excellent leaching resistance. It is speculated that since the absorbance A of the aforementioned composite pigment is below 0.15, its good leaching resistance results in less likelihood of causing skin pigmentation when used in cosmetics.

[0054] The absorbance A can be measured using a spectrophotometer (e.g., the Hitachi U-3900). From the viewpoint of improving the aforementioned effect, the absorbance A can be 0.10 or less, 0.06 or less, or 0.03 or less. There is no particular limitation on the lower limit of absorbance A; it can be 0.00 or 0.01. That is, absorbance A can be, for example, 0.00~0.15, 0.01~0.10, 0.01~0.06, or 0.01~0.03.

[0055] Composite pigments can be so-called core-shell particles. That is, composite pigments can have a core composed of parent particles and a shell composed of daughter particles. In composite pigments, the substrate can form the core as the parent particle, and the coated pigment can form the shell as the daughter particle.

[0056] In composite pigments, the substrate and the coated pigment can be composited through mechanochemical treatment. Here, mechanochemical treatment refers to treatment that induces mechanochemical phenomena between the substrate and the coated pigment. For example, treatment using a dry particle composite device is a mechanochemical treatment. Mechanochemical phenomena are caused by mechanical energy (e.g., compression, shearing, impact, etc.) and include chemical reactions such as the formation and breaking of chemical bonds (mechanochemical reactions) and activation (mechanical activation) that occurs due to particle miniaturization and changes in crystal structure.

[0057] When the substrate and the coated pigment are composited through mechanochemical treatment, the coated pigment is physically fixed and pressed onto the substrate surface due to mechanochemical phenomena. Compared to cases where the coated pigment is only attached to the substrate, the substrate and the coated pigment are firmly bonded together. Therefore, with such composite pigments, the exudation of the aforementioned pigment components is less likely, further inhibiting pigment deposition on the skin when used in cosmetics.

[0058] Composite pigments can have a strong coverage rate of 80% or higher, or even 87% or higher. The higher the strong coverage rate of the composite pigment, the less likely it is to cause the aforementioned pigment components to leach out, thus further inhibiting pigment deposition on the skin when used in cosmetics. There is no particular upper limit to the strong coverage rate of composite pigments; for example, it can be 95%. That is, the strong coverage rate of the aforementioned composite pigments can be, for example, 80-95% or 87-95%. Here, strong coverage rate refers to the proportion of coating pigment firmly fixed to the substrate in the composite pigment. In other words, the higher the strong coverage rate, the more coating pigment is strongly bonded to the substrate.

[0059] The strong coverage can be determined by measuring absorbance A1 and absorbance A2 according to the following conditions 1 and 2, and calculated based on the following formula (a).

[0060] Formula (a): Strong coverage rate [unit: %] = (1 - [absorbance A1] / [absorbance A2]) × 100

[0061] [Condition 1]

[0062] Weigh 0.05 g of the composite pigment into a 30 mL vial, then add 20 mL of a 5% aqueous ethanol solution. Shake the vial for 1 minute using a paint conditioner (Toyo Seiki) to disperse the liquid. After allowing the vial to stand, take a 1 mL sample of the supernatant and dilute it with 9 mL of diluent to obtain a diluted solution. Measure the absorbance of the prepared diluted solution using a spectrophotometer (e.g., Hitachi U-3900) to determine the absorbance at the maximum absorption wavelength (absorbance A1).

[0063] [Condition 2]

[0064] Weigh 0.05 g of the composite pigment into a 30 mL vial, then add 20 mL of diluent. Shake the vial for 1 minute using a paint conditioner (Toyo Seiki) to disperse the liquid. After allowing the vial to stand, take a 1 mL sample of the supernatant and dilute it with 9 mL of diluent to obtain a diluted solution. Measure the absorbance of the prepared diluted solution using a spectrophotometer (e.g., Hitachi U-3900) to determine the absorbance at the maximum absorption wavelength (absorbance A2).

[0065] As the diluting solvent in conditions 1 and 2, a solvent capable of completely dissolving 0.005 g of organic pigment in 20 mL is used. Here, "completely dissolved" means that after adding 20 mL of solvent to 0.005 g of the organic pigment and stirring thoroughly, the resulting mixture is filtered through a 0.45 μm membrane filter (e.g., DISMIC-13HP, Advantec Toyo Co., Ltd.), and the amount of residue is less than 0.15 mg. For example, for the organic pigment contained in the coating pigment, solvents described in the "Quantitative Method" of the "Revised Handbook of Legal Pigments" compiled by the Japan Cosmetic Industry Association can be used. When the organic pigment contained in the coating pigment is Red 202, ethanol (diluted acid) can be used; when the organic pigment contained in the coating pigment is Red 104 aluminum lake, sodium hydroxide solution (diluted) can be used; and when the organic pigment contained in the coating pigment is Blue 1 aluminum lake, sodium hydroxide solution (diluted) can be used.

[0066] The maximum absorption wavelengths in conditions 1 and 2 are the maximum absorption wavelengths of the organic pigments corresponding to the diluting solvent. When the organic pigment in the coating pigment consists only of one type listed in the "Revised Handbook of Legal Pigments" compiled by the Japan Cosmetic Industries Association, the maximum absorption wavelength listed in the "Quantitative Method" of the aforementioned handbook becomes the maximum absorption wavelength in conditions 1 and 2 for that organic pigment. For example, the maximum absorption wavelength is 521 nm when the organic pigment in the coating pigment is only Red 202; 538 nm when the organic pigment in the coating pigment is only Red 104 aluminum lake; and 630 nm when the organic pigment in the coating pigment is only Blue 1 aluminum lake.

[0067] When the coating pigment contains multiple organic pigments, the strong coating ratio for each organic pigment is determined, and the lowest median strong coating ratio is taken as the strong coating ratio of the composite pigment. For example, when the coating pigment contains two organic pigments (organic pigment A and B), firstly, the diluents for organic pigments A and B are selected. Next, the absorbances A1 and A2 are measured using the diluent for organic pigment A as the diluent in conditions 1 and 2, and the strong coating ratio for organic pigment A is determined. Similarly, the absorbances A1 and A2 are measured using the diluent for organic pigment B as the diluent in conditions 1 and 2, and the strong coating ratio for organic pigment B is determined. The median strong coating ratio obtained in this way is taken as the strong coating ratio of the composite pigment.

[0068] Next, the constituent materials of the composite pigment will be explained.

[0069] (Substrate)

[0070] The substrate may be an inorganic substrate made of inorganic materials. The inorganic substrate may be composed 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). Additionally, oxides of these metals may be used as metal oxides. The substrate may also contain organic materials, provided that this does not impede the effects of this disclosure.

[0071] The substrate may be, for example, particles. The shape of the substrate is not particularly limited, but from the viewpoint of easier and stronger adhesion to the coated pigment, it can be in the form of flakes. Examples of flake-shaped substrates include mica, aluminum, alumina, glass, titanium dioxide, iron oxide red, iron oxide, iron oxide yellow, iron oxide black, zinc oxide, Prussian blue, ultramarine, chromium oxide, kaolin, clay, bentonite, bismuth oxychloride, zirconium oxide, and magnesium oxide. One of these substrates may be used alone, or two or more may be used in combination. From the viewpoint of enhancing the glossiness required for cosmetics, at least one of the following can be used: mica, aluminum, alumina, and glass.

[0072] Examples of 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. Commercially available products include SunMICA (trademark, manufactured by Sun Chemical Company) and IRIODIN (registered trademark, manufactured by Merck Company).

[0073] Aluminum (Al) can be categorized in various ways besides elemental aluminum, such as aluminum hydroxide, aluminum chloride, aluminum nitride, aluminum phosphate, and aluminum sulfate. Commercially available products include, for example, HYDROLAN (a registered trademark, manufactured by ECKART Co., Ltd.).

[0074] Glass can be silicate glass with silicon dioxide (SiO2) as its main component. Examples of glass include soda-lime glass, lead glass, alumina glass, cerium silicate glass, cerium silicate glass, borosilicate glass, and aluminosilicate glass. Commercially available products include Glasflake, Metashine, and Lumigilan (all registered trademarks, manufactured by Nippon Sheet Glass Co., Ltd.).

[0075] The substrate can be a core-shell particle having a core (parent particle) and a shell (coating) covering the surface of the core. The core can be made of the aforementioned materials. The core can be, for example, in the form of a sheet. From the viewpoint of enhancing the gloss required by cosmetics, the sheet-like core can contain at least one selected from the group consisting of mica, aluminum, alumina, and glass. The shell can contain at least one component selected from the group consisting of resin, metal, and metal oxide. From the viewpoint of further enhancing the gloss required by cosmetics, the substrate can have a sheet-like core and shell, the shell covering the surface of the core, containing at least one component selected from the group consisting of resin, metal, and metal oxide.

[0076] Examples of resins include acrylic resins, polyurethane resins, styrene resins, ether resins, and epoxy resins. Examples of metals and metal oxides include the same metals and metal oxides as those mentioned above.

[0077] From the perspective of enhancing the desired glossiness in cosmetics, the core and shell can be composed of different materials. Specifically, to further enhance the desired glossiness, the core could contain mica, and the shell could contain titanium dioxide. Pearl pigments can be used as a substrate with this structure. There are no particular limitations on the hue of pearl pigments.

[0078] The size of the substrate can be larger than that of the coated pigment (1 particle). From the viewpoint of the coating pigment's processing efficiency on the substrate when producing composite pigments, the average particle size of the substrate can be 1~80 μm, 5~50 μm, or 10~45 μm. Here, the average particle size of the substrate refers to the particle size (median particle size D50) at which the cumulative value starting from the smallest particle size reaches 50% of the total particle size distribution of the substrate on a volume basis, as determined by wet laser diffraction scattering. The average particle size is measured, for example, using a particle size distribution measuring device MT3000 II (Microtrac BEL Co., Ltd.).

[0079] When the substrate is in sheet form, its thickness is, for example, 0.1 to 5 μm, or 0.2 to 3 μm. The length of the long side of the sheet-like substrate is, for example, 3 to 100 μm, or 5 to 50 μm. The average aspect ratio (length / thickness) of the sheet-like substrate is, for example, 10 to 200, or 20 to 150. If the size and average aspect ratio of the sheet-like substrate are within the above ranges, when the composite pigment is used in cosmetics, there is a tendency for the coating to have a smoother feel. Furthermore, there is a tendency for better elongation during application, and consequently, better color development and gloss.

[0080] The content of the substrate relative to the total amount of the composite pigment can be 20-98% by mass or 30-95% by mass. If the content of the substrate is within the above range, when the composite pigment is used in cosmetics, there is a tendency for the coating of the cosmetic to become smoother to the touch. In addition, there is a tendency for the elongation during coating to become better, and consequently, for the color development and gloss to also become better.

[0081] The ratio of the substrate content to the coating pigment content (substrate / pigment) by mass can be 0.3 to 20, or 0.5 to 15 or 1 to 10. If the ratio (substrate / pigment) is within the above range, when the composite pigment is used in cosmetics, there is a tendency for the coating of the cosmetic to have a smoother feel. In addition, there is a tendency for the elongation during coating to be better, and consequently, for the color development and gloss to be better as well.

[0082] (Covering pigment)

[0083] The coating pigment covers the surface of the substrate. The coating pigment may cover at least a portion of the substrate surface, or it may completely cover the entire surface of the substrate.

[0084] The coating pigment contains at least one organic pigment. Organic pigments are broadly classified into synthetic organic pigments and natural organic pigments. The coating pigment may contain only one of synthetic organic pigments and natural organic pigments, or both. It may contain multiple organic pigments depending on the desired hue. Because the coating pigment contains organic pigments, it is easy to obtain high tinting strength and vivid colors.

[0085] Examples of synthetic organic pigments include azo, phthalocyanine, anthraquinone, perylene, pyrene, quinacridone, thioindole, dioxazine, isoindolineone, quinolineone, methylimine, dikepyrrolopyrrole, and isoindoline.

[0086] Specific examples of synthetic organic pigments include: 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, CI Pigment Red 1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 14, 15, 16, 17, 21, 22, 23, 31, 32, 37, 3. 8, 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, 120, 112, 113, 114, 122, 123, 144, 146, 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, 263, 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, CI Pigment 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, 120, 123, 126, 127, 128, 129, 139, 147, 150, 151, 152, 153, 154, 155, 156, 161, 162, 164 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 179, 180, 181, 182, 185, 187, 188, 192, 193, 194, 196, 198, 199, 213, 214, CI 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, 50, CI Pigment Green 1, 2, 4, 7, 8, 10, 13, 14, 15, 17, 18, 19, 26, 36, 37, 45, 48, 50, 51, 54, 55, 58, 59, etc. Tar pigments other than those mentioned above can also be used as synthetic organic pigments. These synthetic organic pigments can be used alone or in combination of two or more to achieve the desired hue.

[0087] Examples of natural organic pigments (natural colorants) include carotenoids, anthocyanins, flavonoids, quinones, porphyrins, diketones, betaines, and azafirons.

[0088] Specific examples of natural organic pigments include β-carotene, annatto, capsanthin, lutein, lycopene, crocin, crocin acid, astaxanthin, cyanidin acyl glucoside, cyanidin, paeoniflorin, cyanidin glucoside, delphinidin glucoside, anthocyanins, shikonin, malonyl shikonin, pelargonidin, cocoa polyphenols, apigenin, luteolin, polymeric proanthocyanidins, hydroxysaffron yellow, safflower pigment, carmine acid, shellac acid, chlorophyll, phycocyanin, curcumin, betaine, isobetaine, monazine, monazine, iridoid glycosides, ester hydrolysates of iridoid glycosides, and eumelanin. These natural organic pigments can be used alone or in combination of two or more to achieve the desired hue.

[0089] Organic pigments can be lake pigments that utilize metal ions without dissolving. Examples of lake pigments include aluminum lakes, calcium lakes, and barium lakes.

[0090] Coating pigments can also contain components other than organic pigments. Examples of components other than organic pigments include extender pigments.

[0091] From the perspective of balancing chroma and smoothness when producing composite pigments, the content of organic pigments in the coating pigment relative to the total amount of coating pigment can be 5% by mass or more, or 10% by mass or more, 20% by mass or more, 40% by mass or more, or 60% by mass or more. From the perspective of easily maintaining the gloss of the substrate, the content of organic pigments in the coating pigment relative to the total amount of coating pigment can be less than 100% by mass, or less than 80% by mass or less, or less than 60% by mass. From these perspectives, the content of organic pigments in the coating pigment relative to the total amount of coating pigment can, for example, be 5~100% by mass, 5~80% by mass, 10~80% by mass, 20~80% by mass, 40~60% by mass, or 60~100% by mass. It should be noted that the content of organic pigments can be determined, for example, by quantitative analysis using high-performance liquid chromatography (HPLC). Specifically, a standard curve is prepared using standards of organic pigments, and calculations are performed based on this standard curve.

[0092] In the volume-based particle size distribution of coated pigments determined by wet laser diffraction scattering, when the particle sizes at which the cumulative value from the smallest particle size reaches 10% and 90% of the total are defined as D10 and D90, respectively, the difference between them (D90-D10) can be less than 300 μm (0~300 μm). The smaller the difference (D90-D10), the less deviation in the particle size of the coated pigment. If D90-D10 is less than 300 μm, when the composite pigment is used in cosmetics, there is a tendency for the texture of the cosmetic coating to become smoother. In addition, there is a tendency for better elongation during coating, and consequently, better color development and gloss. From the same point of view, the difference (D90-D10) can be less than 100 μm, less than 10 μm, or less than 5 μm. The difference (D90-D10) can be 0 μm or more, 3 μm or more, 3.5 μm or more, or 4 μm or more, or it can be 0~300 μm, 3~300 μm, 3.5~100 μm, 4~10 μm or 0~5 μm. D10 and D90 are measured, for example, using a particle size distribution measuring device MT 3000 II (Microtrac BEL Co., Ltd.).

[0093] From the perspective of balancing the design of the substrate and the chroma of the composite pigment, the content of the coating pigment can be 1 to 50 parts by mass or 5 to 20 parts by mass relative to 100 parts by mass of the substrate.

[0094] (Other ingredients)

[0095] In addition to the substrate and the coated pigment, composite pigments can also contain inorganic powders and organic powders as other components.

[0096] Examples of 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, anhydrous silicic acid, aluminum silicate, magnesium silicate, magnesium aluminum silicate, calcium silicate, barium silicate, strontium silicate, tungstate metal salts, hydroxyapatite, vermiculite, HIGILITE, bentonite, montmorillonite, lithium montmorillonite, zeolite, ceramic powder, dicalcium phosphate, alumina, aluminum hydroxide, boron nitride, and silicon dioxide.

[0097] 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 (12 nylon, 6 nylon), 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.

[0098] When using organic and inorganic powders, the content of organic and inorganic powders relative to the total amount of composite pigments can be 0.1-10% by mass or 0.5-5% by mass, respectively. The total content of organic and inorganic powders can be within the above ranges.

[0099] For the purpose of stabilizing the dispersion of the coated pigment, composite pigments may include an oily base agent as another component. Examples of such oily base agents include waxes that are solid at room temperature (25°C) and liquid oily components.

[0100] Examples of the aforementioned waxes include plant-based waxes such as candelilla wax, carnauba wax, rice bran wax, wood wax, and sunflower wax; animal-based waxes such as beeswax; mineral-based waxes such as terrestrial wax, pure terrestrial wax, and microcrystalline wax; petroleum-based waxes such as solid paraffin wax; and synthetic waxes such as silicone wax and synthetic beeswax.

[0101] Examples of liquid oily components mentioned above include plant-based oils such as olive oil, castor oil, jojoba oil, macadamia nut oil, rosehip oil, cocoa butter, rose oil, and lanolin; animal-based oils such as horse oil, turtle oil, wild boar oil, mink oil, and shark oil; petrolatum; liquid paraffin; hydrocarbon-based oils such as isodecane, isododecane, octyldodecyl ester, diisostearyl malate, and hydrogenated polyisobutylene; and isotrinyl isononanoate, isopropyl isostearate, neopentyl glycol didecanoate, and isononanoic acid. Ester oils such as isotridecyl ester, glyceryl diisostearate, glyceryl triisostearate, diisostearate malate, octyldodecyl alcohol, and N-lauroyl-L-glutamic acid di(phytosterol / 2-octyldodecyl) ester; silicone oils such as dimethylpolysiloxane and phenylmethylpolysiloxane; dimer esters; dimer diol derivatives; cholesterol fatty acid esters; phytosterol fatty acid esters; polyglycerol fatty acid esters; pentaerythritol fatty acid esters; and tri(2-ethylhexanoic acid) glycerol ester.

[0102] The total content of waxes and liquid oily components in composite pigments can be 0.1 to 10% by mass or 0.5 to 5% by mass relative to the total amount of composite pigments.

[0103] The composite pigments described above can be used not only in cosmetics, but also in inks, coatings, toners, and materials used to form molded objects.

[0104] <Methods for Manufacturing Composite Pigments>

[0105] Another embodiment of this disclosure is a method for manufacturing a composite pigment, wherein the composite pigment comprises a substrate and a pigment on the surface of a substrate to be coated. The method for manufacturing the composite pigment includes a coating process in which a substrate is composited with a pigment containing an organic pigment (hereinafter referred to as "coating pigment") using a dry particle composite apparatus, thereby coating the surface of the substrate with the coating pigment. The load power consumed by the dry particle composite apparatus in the coating process is set as P1, and the load power consumed by the dry particle composite apparatus when the coating process is performed in a state where the raw material has been removed is set as P2. When the mass (input amount) of the raw material used in the coating process is set as m, (P1-P2) / m is 0.2~0.5 W·h / g.

[0106] Here, "raw materials" refers to the materials used in the manufacture of composite particles, specifically, a mixture of substrate, coating pigment, and any other components. Details of the substrate, coating pigment, and other components are the same as those in the composite pigment described above. For example, in the volume-based particle size distribution of the coating pigment determined by wet laser diffraction scattering, when the particle sizes at which the cumulative value starting from the smallest particle size reaches 10% and 90% of the total are set as D10 and D90 respectively, the difference between them (D90-D10) can be less than 300 μm, less than 100 μm, less than 10 μm, or less than 5 μm; it can be more than 3 μm, more than 3.5 μm, or more than 4 μm; or it can be 0~300 μm, 3~300 μm, 3.5~100 μm, 4~10 μm, or 0~5 μm.

[0107] In the above manufacturing method, (P1-P2) / m refers to the load power applied to each 1g of raw material in the coating process. In the dry particle compounding device, load power is also required during no-load operation, but the load power P2 consumed during no-load operation is predetermined. By subtracting P2 from the load power P1 consumed in the coating process, the load power consumed for compounding the substrate with the coating pigment is obtained.

[0108] Organic pigments tend to have poorer bleed resistance compared to inorganic pigments. However, in the above-described manufacturing method, since (P1-P2) / m is 0.2~0.5 W·h / g, the composite of the substrate and the coated pigment is well achieved, resulting in a composite pigment with excellent bleed resistance. Specifically, for example, a composite pigment with an absorbance A of 0.15 or less, as described in the above embodiment, can be obtained. Therefore, according to the above manufacturing method, it can also be said that a composite pigment that is less likely to cause pigmentation on the skin when used in cosmetics can be obtained.

[0109] (Coating process)

[0110] In the coating process, raw materials are fed into a dry particle compounding device for processing, thereby compounding the substrate with the coating pigment. There are no particular restrictions on the order in which the raw materials are added. For example, the substrate and the coating pigment can be added to the dry particle compounding device sequentially or simultaneously. Pre-mixing the substrate and coating pigment to prepare a premix, and then adding this premix to the dry particle compounding device, makes it easier to obtain better material mixability.

[0111] The amount of raw materials input in the coating process is sufficient to ensure that the content of each constituent material in the resulting composite pigment falls within the range shown for the content of each constituent material in the composite pigment described in the above embodiment. Specifically, for example, the amount of coating pigment input may be 1 to 50 parts by mass or 5 to 20 parts by mass relative to 100 parts by mass of the substrate.

[0112] As a dry lamination device in the coating process, the device described in Patent Document 2 above (for example, using...) can be used. Figures 1-3 (The device described). Specific examples of such devices include the NOBILTA / NOB type manufactured by Hosokawa Micron Co., Ltd. ("NOBILTA" is a registered trademark) and the "Hybridization System NHS-O type" manufactured by Nara Machinery Works.

[0113] The dry compounding apparatus, for example, includes a rotating part (rotor) consisting of a rotating shaft of the apparatus described in Patent Document 2 and a stirring blade (blade) as a stirring member. The rotating part is, for example, cylindrical.

[0114] The diameter (φ) of the rotating part can be 80 mm or more (e.g., 80~300 mm), or 100~150 mm. Here, the diameter (φ) of the rotating part refers to the length of a line segment on an imaginary line passing through the center of the rotating part (the center of the rotating shaft) when viewed from the axial direction of the rotating shaft, connecting one end of a stirring member to the end of another stirring member located on the opposite side of that stirring member. When the length of the line segment varies depending on the measurement location, the length of the longest line segment is defined as the diameter of the rotating part. The diameter of the rotating part is generally equal to twice the distance from the center of the rotating part to the farthest end of the stirring member, and equal to twice the size of the gap described later minus the diameter of the inner circumference of the shell described later. Figure 3 The value is obtained by finding D1).

[0115] The wider the stirring component, the larger the area it can handle. Therefore, the width of the stirring component can be 15mm or more, or 25mm or more, or 30mm or more. The width of the stirring component can be 15mm to 60mm, or 25mm to 55mm, or 30mm to 55mm. Here, the width of the stirring component refers to the length from one end of the stirring component to the other when viewed from a direction intersecting the axis of rotation (e.g., Figure 2 (The distance between L1 and L3 in the equation).

[0116] The number of stirring components arranged along the axial direction of the rotating shaft is, for example, 2 or more, 2 to 10, 3 to 9, or 4 to 8. When viewed from the axial direction of the rotating shaft, the number of stirring components arranged along the circumference of the rotating shaft is, for example, 4 or less, 1 to 4, or 2 to 3. The total number of stirring components is, for example, 2 to 40, or 10 to 20.

[0117] The length of the shell can be 30 mm or more (e.g., 30-300 mm) or 200-300 mm. Here, the length of the shell refers to the length along the axis of rotation of the shell.

[0118] The diameter of the inner circumference of the shell ( Figure 3 D1 can be 50mm or more (e.g., 50~300mm) or 100~200mm.

[0119] From the viewpoint of suppressing substrate breakage, the size of the gap (the shortest distance between the shell and the stirring member) between the shell and the stirring member can be 2 mm or more, or 3 mm or more. From the viewpoint of ensuring proper composite processing, the size of the gap can be 10 mm or less, or 6 mm or less. From these viewpoints, the size of the gap can be, for example, 2 to 10 mm or 3 to 6 mm.

[0120] The effective processing volume of the dry particle recombination device can be 0.015L or more (e.g., 0.015~0.50L) ​​or 0.15L or more (e.g., 0.15~0.45L).

[0121] In the coating process, the (P1-P2) / m is set to 0.2~0.5 W·h / g. From the viewpoint that the resulting composite pigment has better bleed resistance, (P1-P2) / m can be 0.3 W·h / g or more. From the viewpoint that the resulting composite pigment has better bleed resistance, (P1-P2) / m can be 0.5 W·h / g or less, 0.45 W·h / g or less, or 0.4 W·h / g or less. From the above viewpoint, (P1-P2) / m can, for example, be 0.3~0.5 W·h / g, 0.3~0.45 W·h / g, or 0.3~0.4 W·h / g.

[0122] In addition to the amount of raw materials input, (P1-P2) / m can also be adjusted by the shape and number of stirring components, the gap between the devices, the circumferential speed of the stirring components, the rotation speed of the stirring components, and the mixing time.

[0123] From the perspective of preventing substrate cracking and ensuring a smooth surface of the composite pigment, the circumferential speed of the stirring component in the coating process can be 5.0~20.0m / s, 5.0~15.0m / s, 10.0~15.0m / s, or 10.0~13.0m / s.

[0124] From the perspective of efficient compounding, the rotation speed of the stirring component in the coating process can be above 500 rpm (e.g., 500~5000 rpm), or it can be 1000~5000 rpm, 1500~3500 rpm or 1500~2500 rpm.

[0125] From the viewpoint of being able to suppress substrate breakage while ensuring good composite processing, the mixing time in the coating process can be 1 to 10 minutes or 2 to 10 minutes.

[0126] The power used in the dry particle composite device in the coating process can be 100~2000W.

[0127] (Other processes)

[0128] In addition to the coating process mentioned above, the manufacturing method of composite pigments may also include processes such as sterilization and sieving.

[0129] <Cosmetics, inks, coatings, toners, or molded products>

[0130] Other embodiments of this disclosure include cosmetics, inks, coatings, toners, or molded articles comprising the composite pigments described above. In addition to composite pigments, they may also contain general ingredients suitable for their respective uses and purposes.

[0131] Examples of cosmetics include foundation (blush, concealer, etc.), base makeup (primer, primer, etc.), face powder (loose powder), lipstick (lip gloss, lip tint, lip pencil, blush, lip balm, lip liner, etc.), eye makeup (eyeshadow, eye makeup products, eyeliner, eyebrow pencil, eyebrow brush, mascara, etc.), face cosmetics (blush, blush, blush, etc.), nail cosmetics (nail polish, manicures, colored nail polish, toenail polish, foot care, nail paint, top coat, nail strengthener, etc.), and hair coloring agents (hair dye, hair dye spray, hair dye stick, coloring conditioner, hair cream, etc.).

[0132] Ink can be printing ink. Examples of printing inks include offset ink, letterpress ink, gravure ink, screen ink, flexographic ink, UV-cured ink, water-based ink, oil-based ink, vegetable oil ink, newspaper ink, and inkjet ink.

[0133] Examples of coatings include powder coatings, water-based coatings, epoxy resin coatings, polyurethane resin coatings, fluororesin coatings, polyester resin coatings, melamine resin coatings, acrylic resin coatings, and other synthetic resin coatings.

[0134] Toners are micron-sized powders used in laser printers and copiers to attach color particles to charged plastic particles. Composite pigments can be incorporated into toners as color particles.

[0135] Molded articles can be formed using resin compositions containing composite pigments as plastic colorants. Plastic colorants can take the form of masterbatch (MB), coloring granules / coloring compounds, dry color powder, paste / liquid color masterbatches, etc., and can be any of these forms.

[0136] Example

[0137] The present disclosure is described in more detail below using examples and comparative examples, but the present disclosure is not limited to the following examples.

[0138] <Materials and Equipment Used>

[0139] In the embodiments and comparative examples, the following substrates 1 to 5, pigments (coating pigments) 1 to 5, and apparatus (dry lamination apparatus) 1 to 2 were used.

[0140] [Substrate]

[0141] • Substrate 1

[0142] Mica particles coated with titanium oxide (red, flake-like, manufactured by Sun Chemical, D50: 23 μm)

[0143] • Substrate 2

[0144] Mica particles coated with titanium oxide (red, flake-like, manufactured by Sun Chemical, D50: 20 μm)

[0145] • Substrate 3

[0146] Mica particles coated with titanium oxide (gold, flake-like, manufactured by Sun Chemical, D50: 23 μm)

[0147] • Substrate 4

[0148] Mica particles coated with titanium oxide (green, flake-like, manufactured by Sun Chemical, D50: 23 μm)

[0149] • Substrate 5

[0150] Mica particles coated with titanium oxide (silver, flake-like, Colors & Effects, D50: 40μm)

[0151] [Covered pigment]

[0152] • Pigment 1

[0153] Pigment containing organic pigment (Red 202, azo, CI Pigment Red 57:1) (C19-7703, manufactured by SunChemical, organic pigment content: 60% by mass, D90-D10: 3.90μm)

[0154] • Pigment 2

[0155] A pigment composed of organic pigments (Red 202, azo, CI Pigment Red 57:1) (C19-7720, manufactured by SunChemical, organic pigment content: 100% by mass, D90-D10: 3.28μm).

[0156] • Pigment 3

[0157] Pigment containing organic pigment (Red 202, azo, CI Pigment Red 57:1) (C19-003, manufactured by SunChemical, organic pigment content: 60% by mass, D90-D10: 87.06μm)

[0158] • Pigment 4

[0159] Pigment containing organic pigments (Red 104 aluminum lake, tar pigment) (C14-7723, manufactured by Sun Chemical Company, organic pigment content: 22% by mass, D90-D10: 6.59μm)

[0160] • Pigment 5

[0161] Pigment containing organic pigments (Blue No. 1 aluminum lake, tar pigment) (C39-7733, manufactured by Sun Chemical Company, organic pigment content: 17% by mass, D90-D10: 4.76μm)

[0162] [Dry-type composite processing unit]

[0163] • Device 1 (NOBILTA (registered trademark) NOB-130)

[0164] Blade diameter (φ): 124mm

[0165] Blade width: 49mm

[0166] Number of blades: 16 in total (6 blades arranged axially and 2 blades arranged circumferentially).

[0167] Length of the casing: 230mm

[0168] Inner diameter of the casing: 130mm

[0169] Gap: 3mm

[0170] Effective processing volume: 0.269L

[0171] • Device 2 (NOBILTA (registered trademark) NOB-mini)

[0172] Blade diameter (φ): 86mm

[0173] Blade width: 20mm

[0174] Number of blades: 8 in total (2 blades arranged axially and 4 blades arranged circumferentially).

[0175] Length of the casing: 60mm

[0176] Inner diameter of the casing: 92mm

[0177] Gap: 2mm

[0178] Effective processing volume: 0.033L

[0179] <Examples 1-7 and Comparative Example 1>

[0180] (Manufacturing of composite pigments)

[0181] A premix is ​​prepared by pre-mixing the substrate and the coating pigment at the amounts specified in Table 1. This premix is ​​then fed into a dry particle compounding apparatus (Apparatus 1 or Apparatus 2) specified in Table 1 and processed under the conditions specified in Table 1 (electric force, mixing time, load force, rotational speed, and circumferential speed), thereby obtaining a composite pigment. It should be noted that the load force in Table 1 refers to the load force applied to each 1g of raw material (substrate and coating pigment), equivalent to (P1-P2) / m as described above. Furthermore, the rotational speed and circumferential speed in Table 1 refer to the rotational speed and circumferential speed of the blades.

[0182] (Determination of absorbance A)

[0183] The absorbance A of the composite pigments in Examples 1-7 and Comparative Example 1 was measured as described above. Specifically, 0.05 g of the composite pigment was dispersed in 20 mL of ethyl acetate, and the resulting dispersion was allowed to stand for 24 hours, thereby separating it into precipitate and supernatant. The absorbance of the supernatant was measured in the wavelength range of 300-800 nm using a Hitachi U-3900 spectrophotometer, and the absorbance at the maximum absorption wavelength (absorbance A) was determined. The results are shown in Table 1. It should be noted that the maximum absorption wavelength was read around 515 nm in Examples 1-4 and 7 and Comparative Example 1, around 560 nm in Example 5, and around 670 nm in Example 6.

[0184] (Determination of strong coverage)

[0185] For the composite pigments of Examples 1-7 and Comparative Example 1, the strong coating ratio was measured. Specifically, firstly, absorbance A1 and absorbance A2 were measured according to conditions 1 and 2 above, and the strong coating ratio was calculated based on the above formula (a). The results are shown in Table 1. It should be noted that ethanol (acidic dilute) was used as the diluent in Examples 1-4 and 7 and Comparative Example 1, and sodium hydroxide solution (dilute) was used in Examples 5 and 6. In addition, the maximum absorption wavelength was read around 521 nm in Examples 1-4 and 7 and Comparative Example 1, around 538 nm in Example 5, and around 630 nm in Example 6.

[0186] <Evaluation>

[0187] For the composite pigments of Examples 1-7 and Comparative Example 1, the resistance to pigment deposition was evaluated. Specifically, firstly, a composite pigment (approximately 50 mg) was applied to an area of ​​5 mm × 5 mm or larger on a 100 × 100 mm bio-skin plate of polyurethane No. 132 series (No. 132#W, manufactured by BEAULAX) and spread with a finger. Then, excess pigment was gently blown away with air, and an appropriate amount (approximately 0.1 g) of makeup remover oil (Deve OLIVE & ARGAN, BEAUTY PRODUCTS Co., Ltd.) was placed on the pigment-coated area. Next, the pigment-coated area was wiped clean with a finger, and the oil was wiped off with a wiping paper. The colorimetric value of the cleaned pigment-coated area was measured using a colorimeter (eXact Advanced, manufactured by x-rite), and the C* value was determined. The measurement conditions were set as follows: light source: D50, standard observer: 2°. The results are shown in Table 1.

[0188] [Table 1]

[0189]

Claims

1. A composite pigment comprising a substrate and a pigment covering the surface of the substrate, The pigments include organic pigments. After dispersing 0.05g of the composite pigment in 20mL of ethyl acetate, the resulting dispersion was allowed to stand for 24 hours to separate into a precipitate and a supernatant. The absorbance of the supernatant at the maximum absorption wavelength was below 0.

15.

2. The composite pigment according to claim 1, wherein, The coverage rate is over 80%.

3. The composite pigment according to claim 1 or 2, wherein, The substrate and the pigment are composited through mechanochemical treatment.

4. The composite pigment according to claim 1 or 2, wherein, The substrate is a sheet-like substrate comprising at least one selected from the group consisting of mica, aluminum, alumina and glass.

5. The composite pigment according to claim 1 or 2, wherein, The substrate has a core and a shell covering the surface of the core, the shell comprising at least one selected from the group consisting of resins, metals and metal oxides.

6. A method for manufacturing a composite pigment, the composite pigment comprising a substrate and a pigment covering the surface of the substrate, The manufacturing method includes a coating step: using a dry particle compounding apparatus, compounding the substrate with the pigment containing an organic pigment, thereby coating the surface of the substrate with the pigment. When the load power consumed by the dry particle compounding device in the coating process is set as P1, the load power consumed by the dry particle compounding device when the coating process is carried out in the state of removing raw materials is set as P2, and the mass of the raw material used in the coating process is set as m, (P1-P2) / m is 0.2~0.5 W·h / g.

7. The method for manufacturing composite pigments according to claim 6, wherein, In the volume-based particle size distribution of the pigment determined by wet laser diffraction scattering, when the cumulative value from the smallest particle size reaches 10% and 90% of the total particle size, respectively, the particle size is set as D10 and D90, respectively, and D90-D10 is below 300 μm.

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