Composite pigment and method for producing same

Abstract

The composite pigment comprises a base material and a pigment covering a surface of the base material. The pigment contains an organic pigment, and, when 0.05 g of the composite pigment is dispersed in 20 mL of ethyl acetate and the precipitate is separated from the supernatant by allowing the resulting dispersion to stand for 24 hours, the absorbance of the supernatant at the maximum absorption wavelength is not more than 0.15.

Description

Composite pigment and its manufacturing method

[0001] The present disclosure relates to composite pigments and methods for making the same.

[0002] In the fields of cosmetics, inks, and paints, there has been a demand for materials that exhibit good color development, gloss, and brightness upon application. In particular, makeup cosmetics such as lipstick, eye shadow, blush, and nail polish are required to exhibit uniform color development in order to enhance the finish achieved upon application to the skin. Against this background, composite pigments obtained by combining a base material (e.g., a luster material such as mica) with a pigment (e.g., an organic pigment) are used in the fields of cosmetics, inks, paints, and the like.

[0003] For example, Patent Document 1 describes a flaky pigment having an average particle size of 5 to 60 μm, which is characterized by forming composite particles based on an ordered mixture by subjecting a mixture of a flaky substrate material consisting of flaky substrate particles having 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 treatment without using a liquid medium.

[0004] In recent years, dry particle compositing apparatuses have come to be used as apparatuses for compositing a base material and a pigment.

[0005] For example, Patent Document 2 discloses a processing device that includes a rotating shaft having multiple stirring members attached to its outer periphery and a casing having an inner periphery positioned at a small gap from the stirring members, and that stirs and processes the material inside the casing by the stirring members that move as the rotating shaft rotates, wherein, when viewed from a direction perpendicular to the axial direction of the rotating shaft, the end position of each of the multiple stirring members in a direction parallel to the axial direction of the rotating shaft is located more inside the end position of adjacent stirring members than the other stirring members; and a processing device that includes a rotating shaft having multiple stirring members attached to its outer periphery and a casing having an inner periphery positioned at a small gap from the stirring members, and that stirs and processes the material inside the casing by the stirring members that move as the rotating shaft rotates, wherein the diameter of the inner periphery of the casing is less than twice the diameter of the outer periphery of the rotating shaft.

[0006] The device described in Patent Document 2 has, for example, the structure shown in Figures 1 to 3. With regard to the device having the structure shown in Figures 1 to 3, Patent Document 2 contains the following description.

[0007] "This device is equipped with a rotating shaft 2 with a plurality of stirring members 3 attached to its outer periphery, located at the center of a cylindrical casing 1 enclosed in a jacket 4. The casing 1 has an inner periphery that is separated from the stirring members 3 by a small gap (clearance), and the stirring members 3 move as the rotating shaft 2 rotates, stirring the material inside the casing 1. The rotating shaft 2 is supported on one side by a bearing 7 and is connected to a drive unit 8 consisting of a motor or the like. The raw material inlet 5 is located on the side or top of the end of the casing 1, and the product outlet The inlet 6 is provided at the bottom of the casing 1, at the end opposite the powder inlet 5. That is, the rotating shaft 2 is supported only at one axial end (left side in FIG. 1), and the casing 1 is formed in a bottomed cylindrical shape that is open only at one axial end (left side in FIG. 1) of the rotating shaft 2 and closed at the other axial end (right side in FIG. 1), and is configured to be movable along the axial direction of the rotating shaft 2 between an operating position (position in FIG. 1) that covers the processing space 9 between the rotating shaft 2 and the casing 1, and a non-operating position (not shown) that does not cover the processing space 9." (Paragraphs

[0039] and

[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 rotating shaft 2 is provided with diffusion members 10 on both end surfaces 2a." (Paragraph

[0043] )

[0009] "As shown in FIG. 2, when the rotating shaft 2 of this device is viewed from a position perpendicular to the axial direction, the end position of agitating member 3b(2), for example, in a direction parallel to the axial direction of the rotating shaft 2, is located inside the other adjacent agitating members 3a(1) and 3a(3) relative to the end positions of the other agitating members 3a(1) and 3a(3). In other words, if extension lines L1 and L3 are drawn perpendicularly from the end of agitating member 3b(2), it is positioned so that it overlaps partially with the adjacent agitating members 3a(1) and 3a(3). The same positional relationship applies to the other agitating members 3a(1), 3a(3), 3b(4), 3a(5), and 3b(6). When agitating members 3a and 3b are positioned in this way, the powder penetrates deep into the adjacent agitating members 3a and 3b from the ends of agitating members 3a and 3b, and as a result, the force of the agitating members can be strongly transmitted to the powder." (Paragraph

[0044] )

[0010] "As shown in Figure 3, in this device, the diameter D1 of the inner periphery of the casing 1 is less than twice the diameter D2 of the outer periphery of the rotating shaft 2. In other words, the relationship is D1 ≤ D2 x 2. Figure 3 shows an example where D1 is 1.8 times D2. By making D2 relatively large compared to D1, the space (processing space) 9 in which force acts on the powder is limited, and as a result, even if the peripheral speed of the agitating members 3a, 3b is the same, the force of the agitating members 3a, 3b can be strongly transmitted to the powder. If D1 exceeds twice the value of D2, the space 9 in which force acts on the material to be processed becomes too large, and the force applied to the powder becomes weak." (Paragraph

[0045] )

[0011] "At least some of the agitating members 3a, 3b are formed as feed agitating members 3a that feed the material to be processed in one axial direction of the rotating shaft 2 as the rotating shaft 2 rotates, and other parts of the agitating members 3a, 3b are formed as return agitating members 3b that return the material to be processed in the other axial direction of the rotating shaft 2 as the rotating shaft 2 rotates." (Paragraph

[0046] )

[0012] "As shown in FIG. 2, the plate surface of the feed stirring member 3a is inclined so as to feed the powder in the feed direction, i.e., in one direction along the axial direction of the rotating shaft 2 as the rotating shaft 2 rotates. When the raw material inlet 5 and the product outlet 6 are provided at both ends of the casing 1 (as in FIG. 1), the direction from the raw material inlet 5 to the powder outlet 6 (to the right in FIG. 2) is referred to as the feed direction. On the other hand, the plate surface of the return stirring member 3b is inclined so as to return the powder in the return direction, i.e., in the direction opposite to the feed direction along the axial direction of the rotating shaft 2 as the rotating shaft 2 rotates. When the raw material inlet 5 and the product outlet 6 are provided at both ends of the casing 1 (as in FIG. 1), the direction from the product outlet 6 toward the raw material inlet 5 (to the left in FIG. 2) is referred to as the return direction. The inclination angle of the stirring members 3a and 3b is preferably set within the range of ±5 to ±85 degrees with respect to the axial direction of the rotating shaft 2." (Paragraph

[0047] )

[0013] "The agitating members 3a, 3b are grouped together and spaced apart in the circumferential direction of the rotating shaft 2. The agitating members 3a, 3b in each group are distinguished by the numbers (1), (2), (3), etc. added after 3a, 3b. In FIG. 2, the agitating members 3a, 3b in the same group are inclined relative to the rotating shaft 2 so as to guide the powder in the same direction, i.e., either the forward direction or the return direction. However, this is not limited to this. Also, in FIG. 2, the agitating members 3a, 3b are grouped together and are spaced 180 degrees apart from each other on the rotating shaft 2. However, the agitating members 3a, 3b may be grouped together and consist of multiple members, such as three members spaced 120 degrees apart or four members spaced 90 degrees apart." (Paragraph

[0048] )

[0014] "One of the stirring members 3a, 3b adjacent in the circumferential direction of the rotating shaft 2 is formed on the feeding stirring member 3a, and the other 3b is formed on the returning stirring member 3b. Specifically, as shown in FIG. 3, one of the stirring members 3a (5), 3b (6) adjacent in the circumferential direction of the rotating shaft 2, 3a (5), is formed on the feeding stirring member 3a, and the other 3b (6) is formed on the returning stirring member 3b. It is desirable that each pair of stirring members 3a, 3b be offset by a certain angle from the other pair of stirring members 3a, 3b adjacent in the axial direction of the rotating shaft 2 when viewed from the rotational axis direction. In FIG. 3, the offset is an angle of 90 degrees, but this angle is not limited to this." (Paragraph

[0049] )

[0015] "In Figure 2, three sets of feed stirring members 3a and three sets of return stirring members 3b are alternately arranged in the axial direction of the rotating shaft 2, for a total of six sets. In this case, the powder is subjected to a force of "feed → return → feed → return → feed → return" alternately. Compared to when the powder is subjected to a force in only one direction, the path the powder travels within the casing becomes more complex and longer. As a result, the powder is subjected to an even stronger force from the stirring members 3a and 3b." (Paragraph

[0050] )

[0016] "In FIG. 2 (omitted), the inclination angles of the feed stirring member 3a (omitted) and the return stirring member 3b (omitted) are the same, but this is not limited to this. The inclination angles of the stirring members 3a and 3b may all be different, or only some of them may have different inclination angles." (Paragraph

[0051] )

[0017] "The agitating members 3a and 3b are formed in a plate shape. By making the agitating members 3a and 3b in a plate shape, the entire rotating shaft 2 can be made lighter than block-shaped agitating members, making it possible to design a rotating shaft 2 that rotates at a higher speed, and as a result, the force of the agitating members 3a and 3b can be transmitted to the powder more strongly. Note that the plate shape means that at least the portions of the agitating members 3a and 3b close to the inner periphery of the casing 1 are plate-shaped, and the rotating shaft 2 and the agitating members 3a and 3b may be joined by rod-shaped arms or the like." (Paragraph

[0052] )

[0018] "It is desirable to keep the gap (clearance) between the inner periphery of the casing 1 and the agitating member 3 constant and small. Keeping the clearance constant is to apply a uniform force to the powder, and keeping it small is to apply a stronger force by reducing the escape route for the powder. If simple rectangular plate-like members are provided on the rotating shaft 2 in a direction intersecting the axial direction, the clearance between the center of the plate-like member and the inner periphery of the casing 1 will be wider than at both ends of the plate-like member, so it is desirable to consider the shape of the agitating members 3a and 3b on the inner periphery side of the casing 1 so as to keep the clearance constant. However, it is not necessary for the clearance between the inner periphery of the casing 1 and one set of agitating members 3 and the clearance between that inner periphery and another set of agitating members 3 to be the same. For example, in FIG. 2, the clearance of the agitator 3a(1) at the feed base end near the raw material inlet 5 may be set wider than the clearance of the agitator 3a(5) at the feed end near the product outlet 6. Furthermore, the clearance width is preferably set to 0.05 to 7.5% of the diameter D1 of the inner periphery of the casing, more preferably 0.75 to 3%. If it exceeds 7.5%, the powder has a large escape route and it is not possible to apply a strong force. With a clearance of 0.05% or less, there is a risk that the agitators 3a and 3b may come into contact with the casing 1 due to vibrations generated during operation. Specifically, it is desirable to set the gap between the inner periphery of the casing 1 and the agitators 3a and 3b in the range of 0.3 mm to 50 mm. (Paragraphs

[0053] and

[0054] )

[0019] "In order to ensure that the material to be treated is effectively stirred within the casing 1, it is desirable to set the input volume of the material to be treated within the casing 1 within a range of 5% (lower limit) to 95% (upper limit) of the internal volume of the treatment space 9 within the casing 1 (100%). Here, the internal volume of the treatment space 9 within the casing 1 refers to the volume of the space obtained by subtracting the volume occupied by the rotating shaft 2 from the internal volume of the casing 1 itself (the actual space within the casing 1 within which the material to be treated can move around)." (Paragraph

[0055] )

[0020] "The action of the agitators 3a, 3b is less likely to reach both ends of the rotating shaft 2. Therefore, by providing the feed agitator 3a at one end of the rotating shaft 2 and the return agitator 3b at the other end, the movement of powder toward both ends of the rotating shaft 2 is suppressed, and as a result, it is possible to prevent powder from being discharged without being subjected to the strong agitation action of the agitator 3. That is, the agitator 3a(1) located at one axial end of the rotating shaft 2 (the left end of Figure 2 (omitted)) is formed as the feed agitator 3a that sends the material to be processed from that one axial end to the other end (the right end of Figure 2 (omitted)). The agitators 3b(5), 3b(6) located at the other axial end of the rotating shaft 2 (the right end of Figure 2 (omitted)) are formed as return agitators 3b that return the material to the one axial end." (Paragraph

[0057] )

[0021] "In practice, the agitating members 3a and 3b... (omitted)... the tip portions of the agitating members 3a and 3b that face the inner periphery of the casing 1 are formed into an acute-angled cross section when viewed from the axial direction of the rotating shaft 2, and the center line L of the acute tip portion is inclined from a perpendicular direction to the inner periphery of the casing 1... (omitted)... The angle of the acute tip portion is not limited to 60 degrees, but can be set to any angle from close to 90 degrees to less than 60 degrees. However, considering wear of the tip portion, an angle that is too small is not preferable. The inclination angle of the center line L can also be set to an appropriate value." (Paragraph

[0058] )

[0022] "Diffusion members 10 are provided on both end face portions 2a of the rotating shaft 2. As the diffusion members 10 move with the rotation of the rotating shaft 2, centrifugal force is generated by the diffusion members 10 against powder that attempts to enter the both end face portions 2a, which are difficult to reach with the action of the agitating members 3, and the movement of powder to the both end face portions 2a is suppressed, and as a result, it is possible to prevent the generation of powder that is discharged without being subjected to the strong agitation action of the agitating members 3. As shown in FIG. 3, the diffusion members 10 extend in opposite directions from the center of the rotating shaft 2 at each end face portion 2a. The diffusion member 10 is made up of two plate-like members. As shown by the solid and dashed lines, the agitating members 10 on both end face portions 2a are arranged at 90 degrees offset from each other when viewed in the axial direction of the rotating shaft 2. However, this is not limited to this, and other shapes, angles, and numbers of members may be used as long as they can generate centrifugal force, and the diffusion member may be provided so as to cross the center of the rotating shaft 2 when viewed in the axial direction of the rotating shaft 2. Furthermore, the diffusion member 10 may be provided on only one end face portion 2a of the rotating shaft 2, but it is preferable to provide it on both end face portions 2a. (Paragraph

[0060] )

[0023] Japanese Patent Laid-Open No. 05-214257 Japanese Patent Laid-Open No. 2005-270955

[0024] One of the skin problems commonly caused by cosmetics is pigmentation on the skin. However, composite pigments, which have a base material coated with an organic pigment, have the problem of causing pigmentation on the skin when used in cosmetics.

[0025] Therefore, some aspects of the present disclosure aim to provide a composite pigment that is less likely to cause pigmentation on the skin when used as a cosmetic, and a method for producing the same.

[0026] The inventors of the present disclosure have discovered that the above problems can be solved by using a composite pigment having specific bleeding performance, and have arrived at the present disclosure.

[0027] Some aspects of the present disclosure provide the following [1] to [7].

[0028] [1] A composite pigment comprising a substrate and a pigment covering the surface of the substrate, wherein the pigment comprises an organic pigment, and the composite pigment is dispersed in 0.05 g of the composite pigment 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 liquid. The composite pigment has an absorbance of 0.15 or less at the maximum absorption wavelength of the supernatant liquid.

[0029] [2] The composite pigment according to [1], having a strong coverage of 80% or more.

[0030] [3] The composite pigment according to [1] or [2], wherein the base material and the pigment are combined by a mechanochemical treatment.

[0031] [4] The composite pigment according to any one of [1] to [3], wherein the substrate is a flaky substrate containing at least one selected from the group consisting of mica, aluminum, alumina, and glass.

[0032] [5] The composite pigment according to any one of [1] to [4], wherein the base material comprises a core and a shell covering the surface of the core, and the shell contains at least one selected from the group consisting of a resin, a metal, and a metal oxide.

[0033] [6] A method for producing a composite pigment comprising a base material and a pigment that coats a surface of the base material, the method comprising a coating step of coating a surface of the base material with the pigment by using a dry particle compositing device to composite the base material and the pigment, including an organic pigment, wherein, where P1 is the amount of load power consumed by the dry particle compositing device in the coating step, P2 is the amount of load power consumed by the dry particle compositing device when the coating step is performed in a state where raw materials are excluded, and m is the mass of the raw materials used in the coating step, (P1-P2) / m is 0.2 to 0.5 W·h / g.

[0034] [7] The method for producing a composite pigment according to [6], wherein, in the volume-based particle size distribution of the pigment measured by a wet laser diffraction / scattering method, when the particle sizes at which the integrated values ​​from small particle sizes reach 10% and 90% of the total are defined as D10 and D90, respectively, D90-D10 is 300 μm or less.

[0035] According to the present disclosure, it is possible to provide a composite pigment that is less likely to cause pigmentation on the skin when used as a cosmetic, and a method for producing the same.

[0036] Fig. 2 is a partial front cross-sectional view showing the structure of a processing apparatus according to the invention described in Patent Document 2. Fig. 3 is a view showing a rotating shaft and a stirring member in the processing apparatus of Fig. 1. Fig. 4 is a side cross-sectional view showing the structure of a processing apparatus according to the invention described in Patent Document 2.

[0037] In this specification, a numerical range indicated using "to" indicates a range that includes the numerical values ​​written before and after "to" as the minimum and maximum values, respectively. Furthermore, unless specifically stated otherwise, the units of the numerical values ​​written before and after "to" are the same. Furthermore, in the numerical ranges described in this specification, the upper or lower limit of the numerical range may be replaced with a value shown in the examples. Furthermore, the upper and lower limit values ​​individually described can be combined arbitrarily. Furthermore, "A or B" may include either A or B, or may include both.

[0038] Hereinafter, exemplary embodiments of the present disclosure will be described, but the present disclosure is not limited to the following embodiments.

[0039] <Composite Pigment> One embodiment of the present disclosure is a composite pigment including a base material and a pigment (hereinafter also referred to as a "coated pigment") coating the surface of the base material, wherein the coated pigment includes 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 liquid, the supernatant liquid has an absorbance at the maximum absorption wavelength (hereinafter referred to as "absorbance A") of 0.15 or less.

[0040] A composite pigment having the above characteristics is less likely to cause pigmentation on the skin when used as a cosmetic. In other words, a composite pigment having the above characteristics can be said to have excellent pigmentation resistance. Therefore, the composite pigment is suitable for use as a pigment for cosmetics. The pigmentation resistance of a composite pigment can be evaluated by the following method.

[0041] Bioskin Plate 100 x 100 mm Urethane No. 132 Series (No. 132 #W, manufactured by Viewlux Co., Ltd.) A composite pigment (approximately 50 mg) was applied to a 5 mm x 5 mm section and spread with a finger. The excess pigment was gently blown away with air, and an appropriate amount (approximately 0.1 g) of cleansing oil (e.g., Deve OLIVE & ARGAN, Viewer Products Co., Ltd.) was placed on the pigment-coated area. The pigment-coated area was rubbed with a finger for 2 seconds, the oil was wiped off with a Kimwipe, and the pigment-coated area was wiped up. The pigment-coated area after wiping was measured with a colorimeter (e.g., eXact Advanced (x-rite Co., Ltd.)) (Illuminant: D50, Standard Observer: 2°). The smaller the C* value of the obtained colorimetric data, the better the stainless and pigmentation resistance was evaluated.

[0042] The C* value of the composite pigment measured by the above method is, for example, 3.0 or less, and can be as low as 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.

[0043] The reason why the above effect is obtained is not clear, but is presumed to be as follows. First, a bleeding phenomenon in which colorant components (organic pigments, etc.) bleed out from the composite pigment is thought to be a cause of pigmentation on the skin when the composite pigment is used as a cosmetic. In contrast, the absorbance A indirectly indicates the amount of colorant components (organic pigments, etc.) that bleed from the composite pigment into the dispersion, and the lower the absorbance A, the less likely the composite pigment is to bleed, and the better the bleeding resistance it can be said to have. In this regard, since the absorbance A of the above composite pigment is 0.15 or less, it is presumed that the pigment has good bleeding resistance, and as a result, is less likely to cause pigmentation on the skin when used as a cosmetic.

[0044] The absorbance A can be measured using a spectrophotometer (for example, Hitachi's U-3900). From the viewpoint of enhancing the above-mentioned effect, the absorbance A may be 0.10 or less, 0.06 or less, or 0.03 or less. The lower limit of the absorbance A is not particularly limited, but may be 0.00 or 0.01. That is, the absorbance A may be, for example, 0.00 to 0.15, 0.01 to 0.10, 0.01 to 0.06, or 0.01 to 0.03.

[0045] The composite pigment may be a so-called core-shell particle. That is, the composite pigment may have a core made of a mother particle and a shell made of a child particle. In the composite pigment, the substrate may form the core as the mother particle, and the coated pigment may form the shell as the child particle.

[0046] In the composite pigment, the substrate and the coated pigment may be composited by mechanochemical treatment. Here, mechanochemical treatment refers to a treatment that can induce a mechanochemical phenomenon between the substrate and the coated pigment. For example, a treatment using a dry particle composite device is a mechanochemical treatment. Mechanochemical phenomena are caused by mechanical energy (e.g., compression, shear, impact, etc.), and include chemical reactions (mechanochemical reactions) such as the formation and rupture of chemical bonds, and activation (mechanical activation) caused by particle miniaturization or changes in crystal structure.

[0047] When the substrate and the coated pigment are composited by mechanochemical treatment, the coated pigment is physically fixed and pressed onto the surface of the substrate by a mechanochemical phenomenon, and the substrate and the coated pigment are more strongly bonded than when the coated pigment is simply attached to the substrate. Therefore, with such a composite pigment, bleeding of the color component is less likely to occur, and pigmentation on the skin can be further suppressed when used as a cosmetic.

[0048] The composite pigment may have a strong coverage of 80% or more, or may have a strong coverage of 87% or more. The higher the strong coverage of the composite pigment, the less likely the pigment components are to bleed, and the more effectively pigmentation on the skin can be suppressed when used as a cosmetic. The upper limit of the strong coverage of the composite pigment is not particularly limited, but may be, for example, 95%. That is, the strong coverage of the composite pigment may be, for example, 80 to 95% or 87 to 95%. Here, the strong coverage indicates the proportion of the coated pigment in the composite pigment that is strongly adhered to the substrate. It can be said that the higher the strong coverage, the more the coated pigment is strongly bonded to the substrate.

[0049] The strong coverage can be calculated based on the following formula (a) by measuring the absorbance A1 and the absorbance A2 according to the following conditions 1 and 2: Formula (a): Strong coverage [unit: %] = (1 - [absorbance A1] / [absorbance A2]) x 100

[0050] [Condition 1] 0.05 g of composite pigment is weighed into a 30 mL vial, and 20 mL of a 5% aqueous ethanol solution is added to the vial. The vial is then shaken for 1 minute using a paint conditioner (Toyo Seiki) to disperse the liquid in the vial. The vial is then allowed to stand, and 1 mL of the resulting supernatant is sampled and diluted with 9 mL of dilution solvent to obtain a diluted solution. The absorbance of the prepared diluted solution is measured using a spectrophotometer (e.g., Hitachi U-3900), and the absorbance at the obtained maximum absorption wavelength (absorbance A1) is determined.

[0051] [Condition 2] 0.05 g of composite pigment is weighed into a 30 mL vial, and 20 mL of dilution solvent is added to the vial. The vial is then shaken for 1 minute using a paint conditioner (Toyo Seiki) to disperse the liquid in the vial. The vial is then allowed to stand, and 1 mL of the resulting supernatant is sampled and diluted with 9 mL of dilution solvent to obtain a diluted solution. The absorbance of the prepared diluted solution is measured using a spectrophotometer (e.g., Hitachi U-3900) to determine the absorbance at the obtained maximum absorption wavelength (absorbance A2).

[0052] The dilution solvent used in conditions 1 and 2 is a solvent capable of completely dissolving 0.005 g of organic pigment in a volume of 20 mL. Here, "complete dissolution" refers to the amount of residue remaining when 20 mL of solvent is added to 0.005 g of the organic pigment, thoroughly stirred, and the resulting mixture is filtered through a membrane filter with a pore size of 0.45 μm (e.g., DISMIC-13HP, manufactured by Advantec Toyo Co., Ltd.). Examples of dilution solvents that can be used include those described in the "Quantitative Methods" section of the "Legal Dyes Handbook, Revised Edition, compiled by the Japan Cosmetic Industry Association" for the organic pigments contained in coated pigments. When the organic pigment contained in the coated pigment is Red No. 202, ethanol (dilute acid) may be used. When the organic pigment contained in the coated pigment is Red No. 104 Aluminum Lake, dilute sodium hydroxide TS may be used. When the organic pigment contained in the coated pigment is Blue No. 1 Aluminum Lake, dilute sodium hydroxide TS may be used.

[0053] The maximum absorption wavelengths under conditions 1 and 2 are the maximum absorption wavelengths of the organic pigment corresponding to the dilution solvent. When the organic pigment contained in the coated pigment consists of only one type listed in the "Legal Dyes Handbook, Revised Edition, compiled by the Japan Cosmetic Industry Association," the maximum absorption wavelength for that organic pigment listed in the "Quantitative Method" section of the handbook becomes the maximum absorption wavelength under conditions 1 and 2. For example, when the organic pigment contained in the coated pigment is only Red No. 202, the maximum absorption wavelength is 521 nm; when the organic pigment contained in the coated pigment is only Red No. 104 Aluminum Lake, the maximum absorption wavelength is 538 nm; and when the organic pigment contained in the coated pigment is only Blue No. 1 Aluminum Lake, the maximum absorption wavelength is 630 nm.

[0054] When the coated pigment contains multiple types of organic pigments, the strong coverage rate for each organic pigment is determined, and the lowest of these strong coverage rates is taken as the strong coverage rate of the composite pigment. For example, when the coated pigment contains two types of organic pigments (organic pigments A and B), first, dilution solvents for organic pigments A and B are selected. Next, absorbances A1 and A2 are measured using a dilution solvent for organic pigment A as the dilution solvent under conditions 1 and 2, and the strong coverage rate for organic pigment A is determined. Similarly, absorbances A1 and A2 are measured using a dilution solvent for organic pigment B as the dilution solvent under conditions 1 and 2, and the strong coverage rate for organic pigment B is determined. Of the strong coverage rates determined in this way, the lower value is taken as the strong coverage rate of the composite pigment.

[0055] Next, the constituent materials of the composite pigment will be described.

[0056] (Substrate) The substrate is, for example, an inorganic substrate made of an inorganic material. The inorganic substrate may be 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. The substrate may also contain an organic material as long as it does not impair the effects of the present disclosure.

[0057] The substrate may be, for example, a particle. The shape of the substrate is not particularly limited, but may be flaky (flake-like) from the viewpoint of easily bonding to the coated pigment. Examples of flaky substrates 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. These substrates may be used alone or in combination of two or more. Among the above, at least one selected from the group consisting of mica, aluminum, alumina, and glass may be used from the viewpoint of enhancing the radiance desired for cosmetics.

[0058] Examples of mica include natural mica, synthetic mica, synthetic phlogopite, titanium mica, synthetic titanium mica, iron oxide-coated mica, iron oxide-coated synthetic mica, chromium hydroxide mica, etc. Commercially available products that can be used include SunMICA (trademark, manufactured by Sun Chemical Co.), IRIODIN (registered trademark, manufactured by Merck), etc.

[0059] Examples of aluminum (Al) include aluminum itself, as well as aluminum hydroxide, aluminum chloride, aluminum nitride, aluminum phosphate, aluminum sulfate, etc. Commercially available products that can be used include Hydrolan (registered trademark, manufactured by Eckart Co., Ltd.).

[0060] Glass is made of silicon dioxide (SiO ２ The glass may be a silicate glass mainly composed of silicate glass. Examples of the glass include soda-lime glass, lead glass, soda-lime glass, A-glass, C-glass, E-glass, borosilicate glass, and aluminosilicate glass. Examples of commercially available glass include glass flake, Metashine, and Lumigran (all registered trademarks, manufactured by Nippon Sheet Glass Co., Ltd.).

[0061] The substrate may be a core-shell particle comprising a core (mother particle) and a shell (coating layer) covering the surface of the core. The core may be composed of the materials described above. The core may be, for example, flaky. From the viewpoint of enhancing the radiance desired in cosmetics, the flaky core may contain at least one selected from the group consisting of mica, aluminum, alumina, and glass. The shell may contain at least one component selected from the group consisting of resin, metal, and metal oxide. From the viewpoint of further enhancing the radiance desired in cosmetics, the substrate may comprise a flaky core and a shell covering the surface of the core and containing at least one selected from the group consisting of resin, metal, and metal oxide.

[0062] Examples of the resin include acrylic resin, urethane resin, styrene resin, ether resin, epoxy resin, etc. Examples of the metal and metal oxide include the same metals and metal oxides as those described above.

[0063] The core and shell may be composed of different materials from the viewpoint of enhancing the brilliance desired in cosmetics. In particular, from the viewpoint of further enhancing the brilliance desired in cosmetics, the core may contain mica and the shell may contain titanium oxide. An example of a substrate having such a configuration is a pearl pigment. The hue of the pearl pigment is not particularly limited.

[0064] The size of the substrate may be larger than that of the coated pigment (single particle). The average particle diameter of the substrate may be 1 to 80 μm, 5 to 50 μm, or 10 to 45 μm, from the viewpoint of the efficiency of treating the substrate with the coated pigment during the preparation of the composite pigment. Here, the average particle diameter of the substrate refers to the particle diameter (median diameter D50) when the integrated value from small particle diameters reaches 50% of the total in the volume-based particle size distribution of the substrate measured by wet laser diffraction / scattering method. The average particle diameter is measured, for example, using a particle size distribution measuring device MT3000II (Microtrac Bell Corporation).

[0065] When the substrate is flaky, the thickness of the substrate is, for example, 0.1 to 5 μm, and may be 0.2 to 3 μm. The length of the flaky substrate in the long side direction is, for example, 3 to 100 μm, and may be 5 to 50 μm. The average aspect ratio (length / thickness) of the flaky substrate is, for example, 10 to 200, and may be 20 to 150. When the size and average aspect ratio of the flaky substrate are within the above ranges, when the composite pigment is used in cosmetics, the applied cosmetic product tends to feel smooth to the touch, spread well during application, and also tend to have good color development and gloss.

[0066] The content of the base material may be 20 to 98% by mass, or 30 to 95% by mass, based on the total amount of the composite pigment. When the content of the base material is within the above range, when the composite pigment is used in a cosmetic, the cosmetic tends to have a smooth feel when applied, has good spreadability during application, and also tends to have good color development and gloss.

[0067] The ratio of the content of the substrate to the content of the coated pigment (substrate / pigment), in mass ratio, may be 0.3 to 20, or may be 0.5 to 15, or 1 to 10. When the ratio (substrate / pigment) is within the above range, when the composite pigment is used in a cosmetic, the applied cosmetic tends to feel smooth to the touch, spread well during application, and also tends to have good color development and luster.

[0068] (Coated Pigment) The coated pigment coats the surface of the substrate. The coated pigment may coat at least a part of the surface of the substrate, but may completely coat the entire surface of the substrate.

[0069] The coated pigment contains at least one organic pigment. Organic pigments are broadly classified into synthetic organic pigments and natural organic pigments. The coated pigment may contain only one of a synthetic organic pigment and a natural organic pigment, or may contain both. It may contain multiple organic pigments depending on the desired hue. Because the coated pigment contains an organic pigment, high coloring strength and vivid colors are easily obtained.

[0070] Examples of synthetic organic pigments 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 synthetic organic pigments.

[0071] 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, C.I. 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 0, 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, C. I. 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, 3 5, 36, 56, 56:1, 60, 61, 61:1, 62, 63, 66, 67, 68, 71, 72, 73, 74, 75, 76, 78, 79, C. I. Pigment 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, 124 6, 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, C. I. Examples of synthetic organic pigments include C.I. 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 C.I. 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. Other synthetic organic pigments may also be used. These synthetic organic pigments may be used alone or in combination of two or more depending on the desired hue.

[0072] Examples of natural organic pigments (natural colorants) include carotenoid-based, anthocyanin-based, flavonoid-based, quinone-based, porphyrin-based, diketone-based, betacyanin-based, and azaphilone-based natural organic pigments.

[0073] Specific examples of natural organic pigments include β-carotene, norbixin, bixin, capsanthin, lutein, lycopene, crocin, crocetin, astaxanthin, cyanidin acylglucoside, cyanidin, peonidin aglycone, anidine glucoside, delphinidin glucoside, anthocyanin, shisonin, malonylshisonin, pelargonidin acylglucoside, cocoa polyphenols, apigeninidin, luteolinidin, polymerized proanthocyanidin, saflomin, carthamin, carminic acid, laccaic acid, chlorophyll, phycocyanin, curcumin, betanin, isobetanin, ankaflavin, monascorubrin, iridoid glycosides, ester hydrolysates of iridoid glycosides, eumelanin, etc. These natural organic pigments may be used alone or in combination of two or more depending on the desired hue.

[0074] The organic pigment may be a lake pigment insolubilized with a metal ion, such as aluminum lake, calcium lake, or barium lake.

[0075] The coated pigment may contain components other than the organic pigment, such as an extender pigment.

[0076] The content of the organic pigment in the coated pigment may be 5% by mass or more, 10% by mass or more, 20% by mass or more, 40% by mass or more, or 60% by mass or more, based on the total amount of the coated pigment, from the viewpoint of achieving both saturation and smoothness when the composite pigment is formed. The content of the organic pigment in the coated pigment may be 100% by mass or less, 80% by mass or less, or 60% by mass or less, based on the total amount of the coated pigment, from the viewpoint of easily maintaining the brilliance of the base material. From these viewpoints, the content of the organic pigment in the coated pigment may be, for example, 5 to 100% by mass, 5 to 80% by mass, 10 to 80% by mass, 20 to 80% by mass, 40 to 60% by mass, or 60 to 100% by mass, based on the total amount of the coated pigment. The content of the organic pigment can be determined, for example, by quantitative analysis using high-performance liquid chromatography. Specifically, a calibration curve is prepared using a standard sample of the organic pigment, and the content is calculated based on the calibration curve.

[0077] In the volume-based particle size distribution of the coated pigment measured by wet laser diffraction / scattering, when the particle sizes at which the cumulative values ​​from small particle sizes reach 10% and 90% of the total are defined as D10 and D90, respectively, the difference between these (D90 - D10) may be 300 μm or less (0 to 300 μm). The smaller the difference (D90 - D10), the less variation in particle size of the coated pigment. When D90 - D10 is 300 μm or less, when the composite pigment is used in cosmetics, the applied cosmetic product tends to feel smooth to the touch, spread well upon application, and also tends to have good color development and luster. From the same perspective, the difference (D90 - D10) may be 100 μm or less, 10 μm or less, or 5 μm or less. The difference (D90-D10) may be 0 μm or more, 3 μm or more, 3.5 μm or more, or 4 μm or more, or may be 0 to 300 μm, 3 to 300 μm, 3.5 to 100 μm, 4 to 10 μm, or 0 to 5 μm. D10 and D90 are measured using, for example, a particle size distribution measuring device MT3000II (Microtrac BEL Corporation).

[0078] The content of the coated pigment may be 1 to 50 parts by mass or 5 to 20 parts by mass relative to 100 parts by mass of the base material, from the viewpoint of achieving both the design properties of the base material and the saturation when formed into a composite pigment.

[0079] (Other Components) In addition to the substrate and the coated pigment, the composite pigment may contain inorganic powders or organic powders as other components.

[0080] 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, 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.

[0081] 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, silicon resin powder, acrylic resin powder, melamine resin powder, epoxy resin powder, polycarbonate resin powder, microcrystalline fiber powder, rice starch, and lauroyl lysine.

[0082] When an organic powder and an inorganic powder are used, the content of the organic powder and the content of the inorganic powder may be 0.1 to 10% by mass, or 0.5 to 5% by mass, respectively, relative to the total amount of the composite pigment. The total content of the organic powder and the inorganic powder may be within the above range.

[0083] The composite pigment may contain an oily base as another component for the purpose of stabilizing the dispersion of the coated pigment. Examples of such an oily base include waxes that are solid at room temperature (25°C) and liquid oily components that are liquid.

[0084] 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.

[0085] Examples of the liquid oily component include vegetable oils such as olive oil, castor oil, jojoba oil, macadamia nut oil, crab rose fruit oil, cacao butter, rose oil, 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 diisostearic acid Examples of the oil include ester oils such as glyceryl, 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.

[0086] The total content of the waxes and the liquid oil component in the composite pigment may be 0.1 to 10% by mass, or may be 0.5 to 5% by mass, based on the total amount of the composite pigment.

[0087] The composite pigment described above can be used in cosmetics as well as inks, paints, toners, materials for forming molded articles, and the like.

[0088] <Method for manufacturing composite pigment> Another embodiment of the present disclosure is a method for manufacturing a composite pigment including a base material and a pigment coating the surface of the base material, the method including a coating step of using a dry particle compositing device to composite the base material with a pigment including an organic pigment (hereinafter referred to as a "coating pigment"), thereby coating the surface of the base material with the coating pigment, wherein, where P1 is the amount of load power consumed by the dry particle compositing device in the coating step, P2 is the amount of load power consumed by the dry particle compositing device when the coating step is performed in a state where the raw materials are excluded, and m is the mass (charge amount) of the raw materials used in the coating step, (P1-P2) / m is 0.2 to 0.5 W·h / g.

[0089] Here, the term "raw material" refers to the materials used in the production of the composite particles, and specifically refers to a mixture of the substrate, coating pigment, and other components that are optionally blended. The details of the substrate, coating pigment, and other components are the same as those of the substrate, coating pigment, and other components described above for the composite pigment. For example, in the volume-based particle size distribution of the coating pigment measured by wet laser diffraction / scattering, when the particle sizes at which the integrated values ​​from small particle sizes reach 10% and 90% of the total are defined as D10 and D90, respectively, the difference between these (D90 - D10) may be 300 μm or less, 100 μm or less, 10 μm or less, or 5 μm or less; or 3 μm or more, 3.5 μm or more, or 4 μm or more; or may be 0 to 300 μm, 3 to 300 μm, 3.5 to 100 μm, 4 to 10 μm, or 0 to 5 μm.

[0090] In the above production method, (P1-P2) / m means the load power amount applied per 1 g of raw material in the coating process. A dry particle compositing device requires load power even during idle operation, but the load power amount P2 consumed during idle operation is measured in advance, and the load power amount consumed to composite the base material and the coating pigment can be determined by subtracting P2 from the load power amount P1 consumed in the coating process.

[0091] Although organic pigments tend to have poorer bleed resistance than inorganic pigments, the above-described production method allows for good compounding of the substrate and the coating pigment because (P1-P2) / m is 0.2 to 0.5 W·h / g, resulting in a composite pigment with excellent bleed resistance. Specifically, for example, a composite pigment having an absorbance A of 0.15 or less in the above-described embodiment can be obtained. Therefore, it can be said that the above-described production method allows for the production of a composite pigment that is less likely to cause pigmentation on the skin when used in cosmetics.

[0092] (Coating Step) In the coating step, the raw materials are charged into a dry particle compositing device and processed in the device to composite the base material and the coating pigment. The order in which the raw materials are charged is not particularly limited. For example, the base material and the coating pigment may be charged into the dry particle compositing device sequentially or simultaneously. When the base material and the coating pigment are mixed in advance to prepare a premix, and then the premix is ​​charged into the dry particle compositing device, higher raw material mixability is likely to be achieved.

[0093] The amounts of raw materials charged in the coating step may be such that the content of each constituent material in the resulting composite pigment falls within the ranges shown for the content of each constituent material in the composite pigment of the above embodiment. Specifically, for example, the amount of the coating pigment charged may be 1 to 50 parts by mass or 5 to 20 parts by mass per 100 parts by mass of the base material.

[0094] The dry-type composite device used in the coating step may be the device described in the above-mentioned Patent Document 2 (for example, the device described with reference to FIGS. 1 to 3). Specific examples of such devices include the Nobilta / NOB type ("Nobilta" is a registered trademark) manufactured by Hosokawa Micron Corporation and the "Hybridization System NHS-O type" manufactured by Nara Machinery Works, Ltd.

[0095] The dry-type compounding apparatus includes a rotor that includes a rotating shaft of the apparatus described in Patent Document 2 and a stirring blade as a stirring member. The rotor is, for example, cylindrical.

[0096] The diameter (φ) of the rotating part may be 80 mm or more (e.g., 80 to 300 mm), or may be 100 to 150 mm. Here, the diameter (φ) of the rotating part refers to the length of a line segment that connects the end of one stirring member to the end of the other stirring member opposite the stirring member, among the imaginary lines that pass through the center of the rotating part (the center of the rotating shaft) when viewed from the axial direction of the rotating shaft. If the length of the line segment varies depending on the measurement location, the length of the longest line segment is taken as the diameter of the rotating part. The diameter of the rotating part is usually equal to twice the distance from the center of the rotating part to the farthest end of the stirring member, and is equal to the value calculated by subtracting the diameter of the inner periphery of the casing (D1 in Figure 3), described below, by twice the size of the clearance, described below.

[0097] The wider the agitating member, the larger the area that can be treated, so the width of the agitating member may be 15 mm or more, 25 mm or more, or 30 mm or more. The width of the agitating member may be 15 to 60 mm, 25 to 55 mm, or 30 to 55 mm. Here, the width of the agitating member means the length from one end to the other end of the agitating member when viewed in a direction intersecting the axial direction of the rotation shaft (for example, the distance between L1 and L3 in Figure 2).

[0098] The number of stirring members lined up in the axial direction of the rotating shaft is, for example, 2 or more, and may be 2 to 10, 3 to 9, or 4 to 8. The number of stirring members lined up in the circumferential direction of the rotating shaft when viewed from the axial direction of the rotating shaft is, for example, 4 or less, and may be 1 to 4, or may be 2 to 3. The total number of stirring members is, for example, 2 to 40, or may be 10 to 20.

[0099] The length of the casing may be 30 mm or more (for example, 30 to 300 mm), or may be 200 to 300 mm. Here, the length of the casing means the length along the direction of the rotation axis of the casing.

[0100] The diameter of the inner periphery of the casing (D1 in FIG. 3) may be 50 mm or more (for example, 50 to 300 mm), or may be 100 to 200 mm.

[0101] The size of the gap (clearance) between the casing and the stirring member (the shortest distance between the casing and the stirring member) may be 2 mm or more, or may be 3 mm or more, from the viewpoint of suppressing crushing of the base material. The size of the clearance may be 10 mm or less, or may be 6 mm or less, from the viewpoint of smoothly progressing the compounding treatment. From these viewpoints, the size of the clearance may be, for example, 2 to 10 mm or 3 to 6 mm.

[0102] The effective processing volume of the dry particle composite device may be 0.015 L or more (for example, 0.015 to 0.50 L), or may be 0.15 L or more (for example, 0.15 to 0.45 L).

[0103] In the coating step, the above-mentioned (P1-P2) / m is set to 0.2 to 0.5 W·h / g. From the viewpoint of improving the bleed resistance of the resulting composite pigment, (P1-P2) / m may be 0.3 W·h / g or more. From the viewpoint of improving the bleed resistance of the resulting composite pigment, (P1-P2) / m may 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 may be, for example, 0.3 to 0.5 W·h / g, 0.3 to 0.45 W·h / g, or 0.3 to 0.4 W·h / g.

[0104] (P1-P2) / m can be adjusted by the amount of raw materials charged, as well as the shape and number of stirring members, the clearance of the device, the peripheral speed of the stirring members, the rotation speed of the stirring members, the mixing time, etc.

[0105] The peripheral speed of the stirring member in the coating step may be 5.0 to 20.0 m / s, 5.0 to 15.0 m / s, 10.0 to 15.0 m / s, or 10.0 to 13.0 m / s, from the viewpoints of preventing cracking of the substrate and smoothing the surface condition of the composite pigment.

[0106] From the viewpoint of efficiently progressing the composite treatment, the rotation speed of the stirring member in the coating step may be 500 rpm or more (for example, 500 to 5000 rpm), or may be 1000 to 5000 rpm, 1500 to 3500 rpm, or 1500 to 2500 rpm.

[0107] The mixing time in the coating step may be 1 to 10 minutes or 2 to 10 minutes, from the viewpoint of being able to smoothly proceed with the composite treatment while suppressing crushing of the substrate.

[0108] The power consumption of the dry particle composite device in the coating step may be 100 to 2000 W.

[0109] (Other Steps) In addition to the coating step, the method for producing a composite pigment may further include steps of sterilization, sieving, and the like.

[0110] Cosmetics, Inks, Paints, Toners, or Molded Products Some other embodiments of the present disclosure are cosmetics, inks, paints, toners, or molded products that contain the composite pigment of the above-described embodiment. These may contain, in addition to the composite pigment, general components suitable for the respective uses and purposes.

[0111] Examples of 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.).

[0112] The ink may be a printing ink, such as lithographic (offset) ink, letterpress ink, gravure ink, screen ink, flexographic ink, UV-curable ink, water-based ink, oil-based ink, vegetable oil ink, newspaper ink, or inkjet ink.

[0113] Examples of paints include powder paints, water-based (water-based) paints, epoxy resin paints, urethane resin paints, fluororesin paints, polyester resin paints, melamine resin paints, and synthetic resin paints such as acrylic resin paints.

[0114] Toner is a micro-sized powder made of electrostatically charged plastic particles with color particles attached thereto, used in laser printers and copiers. In toner, composite pigments may be blended as color particles.

[0115] The molded article may be one molded using a resin composition containing the composite pigment as a plastic colorant, which may be in the form of a masterbatch (MB), colored pellets / colored compounds, dry color, paste color / liquid masterbatch, or the like.

[0116] The present disclosure will be described in more detail below using examples and comparative examples, but the present disclosure is not limited to the following examples.

[0117] <Materials and Apparatus Used> In the examples and comparative examples, the following base materials 1 to 5, pigments (coating pigments) 1 to 5, and apparatuses (dry composite apparatuses) 1 and 2 were used.

[0118] [Substrates] Substrate 1: Mica particles coated with titanium oxide (red, flaky, manufactured by Sun Chemical Co., D50: 23 μm) Substrate 2: Mica particles coated with titanium oxide (red, flaky, manufactured by Sun Chemical Co., D50: 20 μm) Substrate 3: Mica particles coated with titanium oxide (gold, flaky, manufactured by Sun Chemical Co., D50: 23 μm) Substrate 4: Mica particles coated with titanium oxide (green, flaky, manufactured by Sun Chemical Co., D50: 23 μm) Substrate 5: Mica particles coated with titanium oxide (silver, flaky, manufactured by Colors & Effects Co., D50: 40 μm)

[0119] [Coating pigments] Pigment 1: Pigment containing an organic pigment (Red No. 202, azo-based, C.I. Pigment Red 57:1) (C19-7703, manufactured by Sun Chemical Co., Ltd., organic pigment content: 60% by mass, D90-D10: 3.90 μm) Pigment 2: Pigment consisting of an organic pigment (Red No. 202, azo-based, C.I. Pigment Red 57:1) (C19-7720, manufactured by Sun Chemical Co., Ltd., organic pigment content: 100% by mass, D90-D10: 3.28 μm) Pigment 3: Pigment containing an organic pigment (Red No. 202, azo-based, C.I. Pigment Red 57:1) (C19-003, manufactured by Sun Chemical Co., Ltd.) Pigment 1: Pigment containing organic pigment (Red No. 104 aluminum lake, tar pigment) (C14-7723, manufactured by Sun Chemical Co., organic pigment content: 22% by mass, D90-D10: 6.59 μm) Pigment 2: Pigment containing organic pigment (Red No. 104 aluminum lake, tar pigment) (C14-7723, manufactured by Sun Chemical Co., organic pigment content: 22% by mass, D90-D10: 6.59 μm) Pigment 3: Pigment containing organic pigment (Blue No. 1 aluminum lake, tar pigment) (C39-7733, manufactured by Sun Chemical Co., organic pigment content: 17% by mass, D90-D10: 4.76 μm)

[0120] [Dry compounding device] Device 1 (Nobilta (registered trademark) NOB-130) Blade diameter (φ): 124 mm Blade width: 49 mm Number of blades: 16 in total (number of blades arranged in the axial direction: 6, number of blades arranged in the circumferential direction: 2) Casing length: 230 mm Casing inner diameter: 130 mm Clearance: 3 mm Effective treatment volume: 0.269 L Device 2 (Nobilta (registered trademark) NOB-mini) Blade diameter (φ): 86 mm Blade width: 20 mm Number of blades: 8 in total (number of blades arranged in the axial direction: 2, number of blades arranged in the circumferential direction: 4) Casing length: 60 mm Casing inner diameter: 92 mm Clearance: 2 mm Effective treatment volume: 0.033 L

[0121] Examples 1 to 7 and Comparative Example 1 (Production of Composite Pigments) A premix was prepared by premixing the base material and the coating pigment in the amounts shown in Table 1, and the premix was then fed into a dry particle compositing apparatus (apparatus 1 or apparatus 2) shown in Table 1 and processed under the conditions (electrical energy, mixing time, load power, rotation speed, peripheral speed) shown in Table 1 to obtain a composite pigment. The load power in Table 1 refers to the load power applied per gram of raw materials (base material and coating pigment) and corresponds to the above-mentioned (P1-P2) / m. The rotation speed and peripheral speed in Table 1 refer to the rotation speed and peripheral speed of the blade.

[0122] (Measurement of Absorbance A) The absorbance A was measured for the composite pigments of Examples 1 to 7 and Comparative Example 1. 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 to separate into a precipitate and a supernatant. The absorbance of the supernatant was measured in the wavelength range of 300 to 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. Note that the maximum absorption wavelength was read around 515 nm for Examples 1 to 4 and 7 and Comparative Example 1, around 560 nm for Example 5, and around 670 nm for Example 6.

[0123] (Measurement of Strong Coverage Ratio) The strong coverage ratio was measured for the composite pigments of Examples 1 to 7 and Comparative Example 1. Specifically, the absorbance A1 and absorbance A2 were first measured according to the above-described Conditions 1 and 2, and the strong coverage ratio was calculated based on the above-described formula (a). The results are shown in Table 1. Note that, as the dilution solvent under Conditions 1 and 2, ethanol (dilute acid) was used in Examples 1 to 4 and 7 and Comparative Example 1, and sodium hydroxide test solution (dilute) was used in Examples 5 and 6. Furthermore, the maximum absorption wavelength was read around 521 nm in Examples 1 to 4 and 7 and Comparative Example 1, around 538 nm in Example 5, and around 630 nm in Example 6.

[0124] <Evaluation> The pigmentation resistance of the composite pigments of Examples 1 to 7 and Comparative Example 1 was evaluated. Specifically, first, a 100 x 100 mm urethane Bioskin Plate No. 132 series (No. 132#W, manufactured by Viewlux) was applied to a section of 5 mm x 5 mm or more, and the composite pigment (approximately 50 mg) was spread with a finger. Then, excess pigment was gently blown off with air, and an appropriate amount (approximately 0.1 g) of cleansing oil (DevOLIVE & ARGAN, Viewer Products Co., Ltd.) was placed on the pigment-coated area. Next, the pigment-coated area was rubbed with a finger for 2 seconds, the oil was wiped off with a Kimwipe, and the pigment-coated area was wiped up and wiped off. The pigment-coated area after wiping was measured using a colorimeter (eXact Advanced, manufactured by X-rite) to determine the C* value. The color measurement conditions were illuminant: D50, standard observer: 2°. The results are shown in Table 1.

[0125]

Claims

1. A composite pigment comprising a substrate and a pigment covering a 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 liquid, the absorbance of the supernatant liquid at the maximum absorption wavelength is 0.15 or less.

2. The composite pigment according to claim 1, having a strong coverage rate of 80% or more.

3. The composite pigment according to claim 1 or 2, wherein the base material and the pigment are combined by a mechanochemical treatment.

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

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

6. A method for producing a composite pigment comprising a base material and a pigment coating a surface of the base material, the method including a coating step of coating a surface of the base material with the pigment by using a dry particle compositing device to composite the base material and the pigment, including an organic pigment, wherein, where P1 is the load power consumed by the dry particle compositing device in the coating step, P2 is the load power consumed by the dry particle compositing device when the coating step is performed in a state where raw materials are excluded, and m is the mass of the raw materials used in the coating step, (P1-P2) / m is 0.2 to 0.5 W·h / g.

7. The method for producing a composite pigment according to claim 6, wherein, in a volume-based particle size distribution of the pigment measured by a wet laser diffraction / scattering method, the particle sizes at which the integrated values ​​from small particle sizes reach 10% and 90% of the total are defined as D10 and D90, respectively, and D90-D10 is 300 μm or less.

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