Pigment composition for cosmetic, and cosmetic

Abstract

To provide: a pigment composition that has exceptional dispersibility (affinity) when mixed with an aqueous solvent and that can also be utilized in cosmetic applications; and a production method therefor.SOLUTION: Specifically provided are: a pigment composition containing a pigment (A) and a sulfosuccinic acid compound (B); a cosmetic comprising the pigment composition; and a method for producing the pigment composition, the method comprising a step of mixing the pigment (A), the sulfosuccinic acid compound (B), and an aqueous solvent, and stirring and dispersing the resulting aqueous mixed solution, and a step of grinding the stirred aqueous mixed solution using a wet-type disperser.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a pigment composition suitably usable for cosmetic applications and a method for producing the same.

Background Art

[0002] Makeup cosmetics such as mascara, eyeliner, eyeshadow, lipstick, and hair cosmetics such as hair dyes contain pigments for coloring purposes. In order to obtain a cosmetic with no color unevenness and having high color development and gloss, it is required to uniformly disperse the pigment in the cosmetic. However, when the affinity between the pigment as a coloring component and other cosmetic constituent components (for example, a solvent component, a base component, an efficacy / effect component, a moisturizing component, etc.) is low, a good dispersion state cannot be achieved even when shear force is applied for a long time, and there is a problem that it is difficult to obtain a satisfactory product in terms of color development and gloss. Therefore, a surface-treated pigment in which the surface of the pigment is coated with a compound may be used in cosmetics.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] For example, Patent Document 1 discloses that a surface-treated powder obtained by surface-treating pigment powder with a cationic organic compound has excellent dispersibility in water and is excellent in touch and adhesiveness when applied to the skin when used in cosmetics. Examples of the cationic organic compound include vinylpyrrolidone·N,N-dialkylaminoethyl methacrylate copolymer dialkyl sulfate. Further, Patent Document 2 discloses that a surface-treated powder obtained by coating the surface of a powder such as an organic pigment with a water-soluble polyoxyalkylene glycol derivative (a hydrophilizing treatment agent) has excellent dispersibility and long-term dispersion stability and is suitable for cosmetic use.

[0005] However, in the methods described in Patent Documents 1 and 2 above, there is still room for improvement in the affinity with an aqueous solvent. An object of the present invention is to provide a pigment composition having excellent dispersibility (affinity) when mixed with an aqueous solvent and usable for cosmetic applications, and a method for producing the same.

Means for Solving the Problems

[0006] As a result of intensive studies to solve the above problems, the present inventors have found that by using a combination of a pigment and a sulfosuccinic acid compound, a pigment composition capable of solving the above problems and a method for producing the same can be provided, and thus completed the following present invention.

[0007] That is, the present invention includes the following aspects. [1] A pigment composition comprising a pigment (A) and a sulfosuccinic acid compound (B). [2] The pigment composition according to [1] above, wherein the sulfosuccinic acid compound (B) is a dialkyl sulfosuccinate represented by the following formula (B-1) or a salt thereof.

[0008]

Chemical formula

[0009] According to the present invention, it is possible to provide a pigment composition having high affinity for an aqueous solvent and excellent dispersibility, and a method for producing a pigment composition for obtaining a pigment composition excellent in affinity and dispersibility for an aqueous solvent. [Embodiments for Carrying Out the Invention]

[0010] Hereinafter, the present invention will be described in detail. Note that the description of the constituent elements described below is an exemplification for explaining the present invention, and the present invention is not limited to these contents.

[0011] <Pigment Composition> The pigment composition of the present invention contains a pigment (A) and a sulfosuccinic acid compound (B). [Pigment (A)] The pigment (A) (hereinafter sometimes referred to as the "(A) component") is not particularly limited, and for example, organic pigments, inorganic pigments, and dyes used in general inks, paints, and recording agents can be used.

[0012] Examples of the organic pigment include pigments such as azo-based, phthalocyanine-based, anthraquinone-based, perylene-based, perinone-based, quinacridone-based, thioindigo-based, dioxazine-based, isoindolinone-based, quinophthalone-based, azomethine azo-based, diketopyrrolopyrrole-based, and isoindoline-based pigments. Examples of inorganic pigments include carbon black, titanium oxide, zinc oxide, tin oxide, iron oxide (yellow (FeOOH), black (Fe3O4), red (Fe2O3)), zinc sulfide, barium sulfate, calcium carbonate, chromium oxide, silica, red iron oxide, mica, aluminum, bismuth oxychloride, kaolin, talc, manganese, ultramarine, cobalt blue, etc. When using the pigment composition of the present invention for cosmetic applications, it is preferable to use pigments for which safety has been confirmed when applied to the skin or the like.

[0013] When using the pigment composition of the present invention for cosmetic applications, it is preferable to use an organic pigment that can be dispersed with an average particle size of 50 nm to 500 μm when dispersed in some solvent.

[0014] [Sulfosuccinic acid compound (B)] In the present invention, the sulfosuccinic acid compound (B) (hereinafter sometimes referred to as the "(B) component") refers to sulfosuccinic acid represented by the following formula (B-0) or a derivative of sulfosuccinic acid represented by the following formula (B-0). Specific examples of sulfosuccinic acid derivatives include, in the following formula (B-0), (1) a compound in which one or both H atoms of two hydroxyl groups bonded to a carbon atom are substituted with an organic group or a cation, (2) a compound in which the H atom of the hydroxyl group bonded to a sulfur atom is substituted with an inorganic cation or an organic cation, (3) a compound having both substitutions of (1) and (2), etc.

[0015] [Chemical formula]

[0016] Among them, as the (B) component, a dialkyl sulfosuccinate represented by the following formula (B-1) or a salt thereof is preferable.

[0017] [Chemical formula] In formula (B-1), R 1 and R 2Each is independently an alkyl group or a cycloalkyl group having 6 to 22 carbon atoms. R 1 and R 2 The alkyl group having 6 to 22 carbon atoms of and R may be linear or branched. Among them, R 1 and R 2 are preferably an alkyl group or a cycloalkyl group having 6 to 18 carbon atoms, more preferably an alkyl group or a cycloalkyl group having 6 to 15 carbon atoms, still more preferably a linear alkyl group or a branched alkyl group having 6 to 12 carbon atoms, and particularly preferably a branched alkyl group having 6 to 10 carbon atoms. R 1 and R 2 may be the same or different from each other, but are preferably the same. In formula (B-1), X is an inorganic cation or an organic cation, and an inorganic cation is preferred. Examples of the inorganic cation include sodium ion, potassium ion, lithium ion, etc., and among them, sodium ion is preferred.

[0018] When the pigment composition of the present invention contains the component (B), as a result of the contact between the component (A) and the component (B) in the composition, the surface of the component (A) becomes hydrophilic. From the viewpoint of making the component (A) more hydrophilic, it is preferable that at least a part of the surface of the component (A) is coated with the component (B). In particular, it is preferable that 30% or more (more preferably 50% or more, still more preferably 80% or more) of the surface area of the component (A) is coated with the component (B). It is also preferable that the entire surface of the component (A) is coated with the component (B). As described above, when the component (A) becomes hydrophilic, the dispersibility and affinity of the pigment composition of the present invention when mixed with an aqueous solvent are improved, and sedimentation and aggregation of the component (A) in the aqueous solvent can be suppressed.

[0019] In the pigment composition of the present invention, the content of component (B) is preferably 1 to 100% by mass, more preferably 5 to 50% by mass, and even more preferably 10 to 30% by mass, based on component (A). By setting it to 10% by mass or more, sufficient hydrophilicity can be imparted to component (A), and by setting it to 30% by mass or less, inhibition of coloring and color development by component (A) can be prevented.

[0020] In the pigment composition of the present invention, the content of component (A) in 100% by mass of the pigment composition is preferably 50 to 99% by mass, more preferably 60 to 95% by mass, and even more preferably 70 to 90% by mass. In the pigment composition of the present invention, the content of component (B) in 100% by mass of the pigment composition is preferably 1 to 35% by mass, more preferably 3 to 30% by mass, and even more preferably 5 to 25% by mass.

[0021] [Other components] The pigment composition of the present invention may be a composition consisting only of component (A) and component (B), or may be a composition consisting of component (A), component (B), and a trace amount of other components (solids). In such cases, the pigment composition of the present invention can be a surface-treated pigment in which component (B) (and a trace amount of other components) coats component (A). Further, the pigment composition of the present invention may be a liquid composition containing component (A), component (B), and other solvent components. Preferred solvent components include aqueous solvents described in <Cosmetics> in the following section.

[0022] As other components, a humectant (moisturizer), preservative, viscosity modifier, pH adjuster, chelating agent, plasticizer, antioxidant, ultraviolet absorber, etc. can be added, and a fragrance can also be added. It is also preferable to use a reactive gelling agent that promotes the fixation of component (B) to component (A). Examples of the humectant include amino acids such as glutamine, histidine, and arginine; polyhydric alcohols having two or more hydroxyl groups such as propylene glycol, 1,3-butylene glycol, and glycerin. Examples of the preservative include alcohols such as 1,2 - hexanediol, 1,2 - pentanediol, and 1,3 - butylene glycol; sodium benzoate; salicylic acid; potassium sorbate; phenoxyethanol, etc. As the reactive gelling agent, those that react with divalent metal ions such as calcium and magnesium in the presence of water to form a gel with a network structure are preferred. Specifically, carrageenan, pectin, alginic acid or its salts are preferred. Specific examples of the alginate include calcium alginate, sodium alginate, potassium alginate, sodium alginate, propylene glycol alginate, siloxantriol alginate, methylsilanol carboxymethyltheophylline alginate, etc. Among them, calcium alginate and sodium alginate are preferred. As the metal ion source (ion cross - linking agent) of the divalent metal ion, calcium chloride (CaCl2), magnesium chloride (MgCl2), etc. are preferred. In the pigment composition of the present invention, the content of the reactive gelling agent in 100% by mass of the pigment composition is preferably 1 - 25% by mass, more preferably 5 - 20% by mass, and even more preferably 10 - 15% by mass.

[0023] The pigment composition of the present invention can be used in various applications that require coloring, etc. by the component (A). Due to the presence of the component (B), the affinity of the component (A) for the aqueous solvent is improved, and as a result, sedimentation and aggregation of the component (A) in the aqueous solvent can be prevented, and the component (A) can be well - dispersed in the aqueous solvent. The "aqueous solvent" intended in the present invention is the same as that described in <Cosmetics> in the following section. Since the pigment composition of the present invention can use components that can be used in cosmetics, it is preferably used for cosmetic applications. As cosmetics, cosmetics in which pigments are used, such as makeup cosmetics, hair cosmetics, sunburn / sunblock cosmetics, etc., are preferred. Examples of makeup cosmetics include mascara, eyeliner, eyebrow, eyeshadow, lipstick, nail polish, foundation, cheek color, etc. Examples of hair cosmetics include hair color, hair nail polish, hair dye for gray hair, hair bleach, shampoo, rinse, conditioner, hair treatment, hair liquid, hair mousse, pomade, hair tonic, etc.

[0024] <Cosmetics> The cosmetic of the present invention contains the above-described pigment composition and can be suitably used as a cosmetic. In the cosmetics, moisturizing components, oily components (emollient components), efficacy / effect components (whitening components, skin roughness improving components, bioactive components, ultraviolet ray protecting components, astringent components, stratum corneum / cuticle softening components), surfactants (emulsifying components / washing components), stabilizing components, antiseptic / bactericidal components, coloring components other than component (A), solvent components, base components, etc., which are usually used in cosmetics, can be used in combination within a range that does not impair the effects of the present invention. Specific examples of compounds that can be formulated in cosmetics include hydrocarbons, oils and fats such as animal and vegetable oils and mineral oils, waxes, esters, fatty acids, higher alcohols, alcohols such as lower alcohols and polyhydric alcohols, hyaluronic acid, collagen, chitosan, ceramide, cellulose, xanthan gum, high molecular compounds such as polyethylene glycol and various silicone compounds, components derived from animals, plants, algae, microorganisms, etc., amino acids, inorganic minerals, various surfactants, ultraviolet absorbers, whitening agents, anti-inflammatory agents, blood circulation promoters, anti-aging agents, moisturizing agents, vitamins, thickeners, gelling agents, antioxidants, preservatives, antibacterial agents, chelating agents, pH adjusters, powders, fragrances, coloring agents, etc. These can be appropriately combined according to the desired dosage form and function.

[0025] As described above, the pigment composition of the present invention has good dispersibility in aqueous solvents, and therefore the cosmetic of the present invention may contain an aqueous solvent. The aqueous solvent may be water, a water-soluble solvent, or a mixed solvent consisting of water and a water-soluble solvent.

[0026] Specific examples of water include natural water, purified water, distilled water, ion-exchanged water, pure water, and ultrapure water (for example, Milli-Q water). Among these, purified water, distilled water, ion-exchanged water, pure water, or ultrapure water is preferred as water from the viewpoint of having fewer impurities.

[0027] Examples of the water-soluble solvent include ketones such as acetone, methyl ethyl ketone, methyl butyl ketone, and methyl isobutyl ketone; alcohols such as methanol, ethanol, 2-propanol, 2-methyl-1-propanol, 1-butanol, and 2-methoxyethanol; ethers such as tetrahydrofuran, 1,4-dioxane, and 1,2-dimethoxyethane; and amides such as dimethylformamide and N-methylpyrrolidone. In particular, it is preferable to use a compound selected from the group consisting of ketones having 3 to 6 carbon atoms and alcohols having 1 to 5 carbon atoms. In addition, other water-soluble organic solvents that can dissolve in water can also be used. For example, glycols such as ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, polyethylene glycol, and polypropylene glycol; diols such as butanediol, pentanediol, hexanediol, and diols homologous to these; glycol esters such as propylene glycol laurate; glycol ethers such as cellosolve including diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol monohexyl ether, propylene glycol ether, dipropylene glycol ether, and triethylene glycol ether; alcohols such as methanol, ethanol, isopropyl alcohol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, butyl alcohol, pentyl alcohol, and alcohols homologous to these; or sulfolane; lactones such as γ-butyrolactone; lactams such as N-(2-hydroxyethyl)pyrrolidone; glycerin and its derivatives, polyoxyethylene benzyl alcohol ether, and other various solvents known as water-soluble organic solvents. These water-soluble organic solvents can be used alone or in a mixture of two or more. Among them, polyhydric alcohols such as glycols and diols with high boiling points, low volatility, and high surface tension are preferred, and glycols such as diethylene glycol and triethylene glycol are particularly preferred.

[0028] The dosage form of the cosmetic is not particularly limited and can be any of liquid, emulsion, gel, cream, solid, paste, powder, etc. In the case of liquid, it can be any of emulsion systems such as aqueous, oil-in-water emulsion, and water-in-oil emulsion.

[0029] <Method for producing the pigment composition> The pigment composition of the present invention is A step of mixing the pigment (A), the sulfosuccinic acid compound (B), and an aqueous solvent, and stirring the resulting aqueous mixture to disperse the pigment (A), the sulfosuccinic acid compound (B), and the aqueous solvent (hereinafter sometimes referred to as "step 1"); and The method includes a step of disintegrating the stirred aqueous mixture using a wet disperser (hereinafter, sometimes referred to as "step 2").

[0030] [Process 1] In step 1, the pigment (A), the sulfosuccinic acid compound (B), and the aqueous solvent are mixed, and the resulting aqueous mixture is stirred to disperse each component in the aqueous mixture. The pigment (A), the sulfosuccinic acid compound (B), and the aqueous solvent in step 1 are the same as the above-mentioned component (A), component (B), and aqueous solvent, respectively. In the present invention, "stirring" refers to mixing substances together to mix multiple types of substances. Specifically, it refers to a process of mixing multiple types of substances with the aqueous solvent by stirring component (A), component (B), an aqueous solvent, and optionally other components in a stirrer. The agitator is not particularly limited as long as it can achieve the effects of the present invention and can be appropriately selected depending on the purpose, and examples include simple agitators such as a homodisper, emulsifier, line mixer, three-one motor, and magnetic stirrer, and media dispersers such as a sand mill, bead mill, pebble mill, ball mill, pearl mill, basket mill, attritor, dyno mill, bore mill, viscomill, motor mill, SC mill, dry mill, and paint conditioner. Also usable are media-less dispersers that do not use media, such as ultrasonic dispersers (ultrasonic homogenizers), high-pressure homogenizers, nanomizers, and ultimizers, as well as roll mills such as three-roll mills, Henschel mixers, pressure kneaders, intensive mixers, Banbury mixers, and planetary mixers.

[0031] The conditions in Step 1 are not particularly limited and can be appropriately selected according to the purpose as long as the effects of the present invention are achieved. For example, the stirring time is preferably 0.5 to 48 hours. Also, the temperature during stirring is preferably 10 to 80°C.

[0032] [Step 2] In Step 2, the aqueous mixture stirred in Step 1 is crushed using a wet disperser. In the present invention, "crushing" means applying mechanical energy such as impact force and shear force to aggregates such as agglomerated particles to break the bonds between the components constituting the aggregates and reduce the particle size. For example, when the components in the aqueous mixture (e.g., the component (A), an aggregate of the component (A) and the component (B), etc., or the component (A) coated with the component (B), etc.) are aggregated, it means to break them to a size close to the primary particle size, that is, to form primary particles. By crushing, it is possible to disperse the component (A) that has become smaller particles in the aqueous solvent while mainly reducing the particle size of the component (A).

[0033] The crusher is not particularly limited as long as it exhibits the effects of the present invention and can be appropriately selected according to the purpose. For example, there are a method using shear force by mechanical stirring, a method using the pressure change, flow path change, or the force generated by the collision of the liquid flow rate to be treated supplied at high speed. More specifically, examples of the crusher include starburst, microfluidizer, nanomizer, etc.

[0034] The conditions in Step 2 are not particularly limited and can be appropriately selected according to the purpose as long as the effects of the present invention are achieved. For example, the crushing time is preferably 1 to 24 hours. Also, the temperature during crushing is preferably 1 to 80°C. Also, the pressure during crushing is preferably 100 to 250 MPa, and more preferably 225 to 250 MPa. Also, the number of passes during crushing is preferably 1 to 100 times, more preferably 25 to 75 times. The volume average diameter of the particles containing the (A) component and the (B) component after crushing is preferably 100 to 2500 nm, more preferably 100 to 1000 nm, and even more preferably 120 to 180 nm. The volume average diameter can be measured with "MT3300II" (manufactured by Microtrac Bell).

[0035] In Steps 1 to 2, various conditions such as the type of apparatus, size (capacity), types and amounts of the stirring and crushing samples ((A) component, (B) component, other components), and the flow rate of the stirring and crushing samples are appropriately set.

[0036] By passing through Steps 1 to 2, at least a part of the surface of the (A) component (preferably 30% or more of the surface area, more preferably 50% or more, and even more preferably 80% or more) is coated with the (B) component. After Step 2, other components may be added and mixed, and the other components may be contained in the (A) component coated with the (B) component. As the other components, the above-described reactive gelling agent is preferred. In the production of the pigment composition of the present invention, the amount of the reactive gelling agent used is preferably 1 to 45 parts by mass, more preferably 5 to 35 parts by mass, and even more preferably 10 to 25 parts by mass with respect to 100 parts by mass of the (A) component. The amount of the ion crosslinking agent used is preferably 10 to 70 parts by mass, more preferably 20 to 60 parts by mass, and even more preferably 30 to 50 parts by mass with respect to 100 parts by mass of the reactive gelling agent. The volume average diameter of the particles containing the (A) component, the (B) component, and the structural unit derived from the gelling agent (the structure derived from alginic acid) when treated with the reactive gelling agent is more preferably 15 to 25 μm. The volume average diameter can be measured with "MT3300II" (manufactured by Microtrac Bell). Further, a drying step may be provided as an optional step after step 2 to distill off most of the aqueous solvent to obtain a solid or wet cake pigment composition. Drying can be carried out by heating using a known method or using a commercially available dryer. Furthermore, a grinding step may be provided after the drying step. By grinding, the solid or wet cake can be pulverized into a powder form that is easy to use in cosmetics.

Examples

[0037] Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

[0038] <Example 1> (Production of surface-treated powder (1)) Into two 1 L polyvinyl bottles, 33.0 g of a 50% by mass isopropyl alcohol solution of sodium di-2-ethylhexyl sulfosuccinate (manufactured by Tokyo Chemical Industry Co., Ltd.), 38.5 g of isopropyl alcohol, 451.0 g of ion-exchanged water, and 110.0 g of "C47-2222 SunCROMA D&C Black 2" (carbon black manufactured by Sun Chemical Co., Ltd.) were charged respectively, and 10.0 g of φ3.0 mm glass beads were added and stirred at 30 °C for 1 hour with a paint conditioner. After stirring, the slurries from which the glass beads were separated were combined, adjusted to a concentration with ion-exchanged water so that the non-volatile content was 15.0% by mass, and then subjected to 50 passes of dispersion treatment at a pressure of 245 MPa under a temperature condition of 30 °C with a Starburst (manufactured by Sugino Machine Co., Ltd.), and the slurry remaining in the path was pushed out with 300.0 g of ion-exchanged water to obtain 1646.8 g of a slurry having a non-volatile content of 14.1% by mass and a volume average diameter of 132 nm. The volume average diameter was measured with a "NanoTrack WAVEII" (manufactured by Microtrac·BEL Co., Ltd.). The obtained slurry was heated to 100 °C, and a part of the contained solvent and water was distilled off (844.6 g), and the obtained wet cake was dried (90 °C) in a box dryer and then pulverized with a nozzle to obtain surface-treated powder (1).

[0039] <Example 2> (Manufacture of Surface-Treated Powder (2)) Into two 1-L polyvinyl bottles, 36.0 g of a 50% by mass isopropyl alcohol solution of sodium di-2-ethylhexyl sulfosuccinate (manufactured by Tokyo Chemical Industry Co., Ltd.), 27.0 g of isopropyl alcohol, 386.0 g of ion-exchanged water, and 90.0 g of "C47-2222 SunCROMA D&C Black 2" (carbon black manufactured by Sun Chemical) were charged. 10.0 g of glass beads with a diameter of φ3.0 mm were added, and the mixture was stirred at 30 °C for 1 hour using a paint conditioner. After stirring, the slurries from which the glass beads were separated were combined, and the concentration was adjusted with ion-exchanged water so that the non-volatile content became 15.0% by mass. Then, under the temperature condition of 30 °C and at a pressure of 245 MPa, the combined slurry was subjected to 50 passes of dispersion treatment using a Starburst (manufactured by Sugino Machine Limited), and a slurry with a non-volatile content of 14.1% by mass and a volume average diameter of 140 nm was obtained. Ion-exchanged water was added to the slurry to adjust the non-volatile content to 10% by mass, and the mixture was heated to 100 °C to distill off a part of the contained solvent and water (390.0 g), obtaining a slurry with a non-volatile content of 11.4% by mass and a volume average diameter of 154 nm. Under stirring conditions, 330.5 g of a 5% by mass aqueous solution of sodium alginate (KIMICA ALGIN ULV-L3, manufactured by KIMICA Corporation) was added to the obtained slurry, and 999.4 g of ion-exchanged water was added so that the non-volatile content became 7.0% by mass. 1899.3 g of a 0.35% by mass aqueous CaCl2 solution was added dropwise to the slurry over about 2 hours to obtain a slurry with a volume average diameter of 20.6 μm. The volume average diameter was measured using "MT3300II" (manufactured by Microtrac·BEL Corporation). The slurry was filtered through hard filter paper No. 4A (manufactured by Advantech Co., Ltd.), washed with ion-exchanged water until the specific conductivity became 63 μS / m, and the obtained wet cake was dried (90 °C) using a box dryer and then pulverized with a nozzle to obtain the surface-treated powder (2).

[0040] <Examples 3 to 4, Comparative Example 1> (Preparation of Liquid Cosmetics) Using the surface-treated powders (1) to (2) obtained in Examples 1 to 2 above, or untreated carbon black (「C47-2222 SunCROMA D&C Black 2」(carbon black manufactured by Sun Chemical Corporation)), pigment powder, glycerin, and ion-exchanged water were charged in the formulations shown in Table 1 so that the pigment content was 3.0% by mass, and each example of the liquid cosmetic was prepared by stirring (2000 rpm) for 30 minutes using a Dispermat (manufactured by Eihiro Seiki Co., Ltd., CV3-PLUS).

[0041]

Table 1

[0042] (Affinity evaluation) As an evaluation of the affinity with an aqueous solvent, the absorbance at 550 nm was measured using the liquid cosmetics immediately after preparation and after standing for 24 hours, and the absorbance change rate was calculated from the value obtained by dividing the absorbance after standing for 24 hours by the absorbance immediately after adjustment. Specifically, the supernatant of each example of the liquid cosmetic was collected, ion-exchanged water was added so that the pigment content was 0.002% by mass, and the absorbance at 550 nm was measured using a double-beam spectrophotometer 「U-2910」(manufactured by Hitachi High-Technologies Corporation). The results are shown in Table 2.

[0043]

Table 2

[0044] From the above results, it was confirmed that the cosmetics of Examples 3 to 4 using the pigment composition of the present invention had a high affinity with an aqueous solvent, while the cosmetic of Comparative Example 1 containing no component (B) was inferior in affinity with an aqueous solvent.

[0045] <Example 5> Except for changing 「C47-2222 SunCROMA D&C Black 2」(carbon black manufactured by Sun Chemical) to 「C47-5002 SUNPURO TITANIUM OXIDE」(titanium oxide manufactured by Sun Chemical), surface-treated powder (3) was obtained by the same operation as in Example 1. The volume average diameter of the slurry obtained after crushing was 890.9 nm.

[0046] <Example 6> Except for changing 「C47-2222 SunCROMA D&C Black 2」(carbon black manufactured by Sun Chemical) to 「C33-7011 SUNPURO BLK IRON OX」(magnetite manufactured by Sun Chemical), surface-treated powder (4) was obtained by the same operation as in Example 1. The volume average diameter of the slurry obtained after crushing was 2366.4 nm.

[0047] <Example 7> Except for changing 「C47-2222 SunCROMA D&C Black 2」(carbon black manufactured by Sun Chemical) to 「C33-9001 SUNPURO FE OX」(iron oxyhydroxide manufactured by Sun Chemical), surface-treated powder (5) was obtained by the same operation as in Example 1. The volume average diameter of the slurry obtained after crushing was 828.5 nm.

[0048] <Example 8> Except for changing 「C47-2222 SunCROMA D&C Black 2」(carbon black manufactured by Sun Chemical) to 「C33-8001 SUNPURO RED IRON」(ferric oxide manufactured by Sun Chemical), surface-treated powder (6) was obtained by the same operation as in Example 1. The volume average diameter of the slurry obtained after crushing was 1333.8 nm.

[0049] <Examples 9 to 12, Comparative Examples 2 to 5> (Preparation of Liquid Cosmetics) Using the surface-treated powders (3) to (6) obtained in Examples 5 to 8 above, or the untreated pigments used to produce them, pigment powder, glycerin, and ion-exchanged water were charged in the formulations shown in Table 3 so that the pigment content was 3.0% by mass, and each example of the liquid cosmetic was prepared by stirring (2000 rpm) for 30 minutes using a Dispermat (manufactured by Eihiro Seiki Co., Ltd., CV3-PLUS).

[0050]

Table 3

[0051] (Affinity Evaluation) As an evaluation of the affinity with an aqueous solvent, the absorbance at 550 nm was measured using the liquid cosmetic immediately after preparation and after standing for 24 hours, and the absorbance change rate was calculated from the numerical value obtained by dividing the absorbance after standing for 24 hours by the absorbance immediately after adjustment. Specifically, the supernatant of the liquid cosmetic of each example was collected, ion-exchanged water was added so that the pigment content was 0.002% by mass, and the absorbance at 550 nm was measured using a double-beam spectrophotometer "U-2910" (manufactured by Hitachi High-Technologies Corporation). The results are shown in Table 4.

[0052]

Table 4

[0053] From the above results, it was confirmed that the liquid cosmetics of Examples 9 to 12 using the pigment composition of the present invention had a higher absorbance change rate than Comparative Examples 2 to 5, which are untreated pigments not containing the corresponding component (B), indicating a higher affinity with the aqueous solvent.

Claims

1. A pigment composition comprising a pigment (A) and a sulfosuccinic acid compound (B).

2. The pigment composition according to Claim 1, wherein the sulfosuccinic acid compound (B) is a dialkyl sulfosuccinate represented by the following formula (B-1) or a salt thereof. 【Chemical 1】 (In formula (B-1), R １ and R ２ each independently represents an alkyl group or a cycloalkyl group having 6 to 22 carbon atoms, X represents an inorganic or organic cation.)

3. The pigment composition according to Claim 1, wherein the sulfosuccinic acid compound (B) covers at least a part of the surface of the pigment (A).

4. The pigment composition according to Claim 1, further comprising a reactive gelling agent.

5. A cosmetic containing the pigment composition according to any one of Claims 1 to 4.

6. The cosmetic according to Claim 5, which is a cosmetic selected from the group consisting of makeup cosmetics, hair cosmetics, and sunscreen / sunblock cosmetics.

7. A process for producing a pigment composition, comprising the steps of mixing a pigment (A), a sulfosuccinic acid compound (B), and an aqueous solvent, stirring the resulting aqueous mixture to disperse it, and crushing the stirred aqueous mixture using a wet disperser.

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