Cosmetic base, cosmetic product containing the same, and method for manufacturing the cosmetic base.

Abstract

This invention provides a novel cosmetic base that, even when using the same or fewer pigment particles as conventional products, achieves improved pore-correcting effects compared to conventional products. [Solution] A cosmetic base comprising (A) a water-soluble copolymer based on acryloyldimethyltaurine, (B) at least one of a humectant and water, and (C) pigment particles whose surface is hydrophobic, in an oily medium.

Description

Technical Field

[0001] The present invention relates to a cosmetic base. The present invention also relates to a cosmetic containing the cosmetic base of the present invention and a method for producing the cosmetic base of the present invention.

Background Art

[0002] In recent years, cosmetics have been emphasized for functions such as protecting the skin or maintaining the beauty of the skin appearance. Along with this, various cosmetics or cosmetic bases have been developed to meet diverse consumer needs.

[0003] For example, in Patent Document 1, a method for producing an oil-in-water type emulsified cosmetic and an oil-in-water type emulsified cosmetic produced by the method are disclosed, which contain fine particle metal oxides having an ultraviolet ray blocking effect and contain a relatively large amount of an oily component while reducing the content of an emulsifier.

[0004] More specifically, the method for producing the cosmetic of Patent Document 1 includes a step of obtaining an oil-in-water type emulsified cosmetic by adding an aqueous phase containing a hydrophilic emulsifier to an oil phase containing a hydrophobically surface-treated fine particle metal oxide, a lipophilic emulsifier, a sodium acrylate / sodium acryloyldimethyltaurine copolymer, and a liquid oil and subjecting it to phase inversion emulsification. The cosmetic of Patent Document 1 thus produced is an oil-in-water type emulsified cosmetic, which is a phase inversion emulsion containing a hydrophobically surface-treated fine particle metal oxide, a lipophilic emulsifier, a sodium acrylate / sodium acryloyldimethyltaurine copolymer, a liquid oil, and a hydrophilic emulsifier.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The bases of cosmetics known to date that correct or conceal pores primarily use ingredients that minimize the appearance of unevenness on the skin surface and provide a smooth texture. More specifically, such pore-correcting cosmetic bases may incorporate pigment particles that can physically fill pores and also conceal them through color development.

[0007] However, using pigment particles can sometimes make pores more noticeable depending on skin tone, or the pigment can adhere to areas other than the pores, resulting in a white cast and an unnatural finish.

[0008] Therefore, there is still room for improvement in cosmetic bases with pore-correcting effects, or in cosmetics containing them.

[0009] The present invention aims to improve upon the above circumstances, and its objective is to provide a novel cosmetic base that can improve pore correction effect compared to conventional methods, even when using the same amount or fewer pigment particles as conventional methods.

[0010] The present invention also provides a cosmetic composition containing the above-mentioned novel cosmetic base, and a method for producing the above-mentioned novel cosmetic base. [Means for solving the problem]

[0011] The present invention, which achieves the above objectives, is as follows:

[0012] <Aspect 1> A cosmetic base containing the following components (A) to (C) in an oily medium: (A) Water-soluble copolymer based on acryloyldimethyltaurine, (B) at least one of a humectant and water, (C) Pigment particles whose surface has been treated to be hydrophobic. <Aspect 2> The above component (B) includes the above humectant, and At least a portion of component (A) and at least a portion of component (B) are in a blend. The cosmetic base described in Attribute 1. <Aspect 3> The cosmetic base according to embodiment 1 or 2, wherein the content of component (A) is 0.1 to 3.0% by mass. <Aspect 4> A cosmetic base according to any one of embodiments 1 to 3, wherein the content of component (B) is 1.0 to 50% by mass. <Aspect 5> A cosmetic base according to any one of embodiments 1 to 4, wherein component (B) is present in an amount of 6.0 to 60 parts by mass per 1.0 part by mass of component (A). <Pattern 6> A cosmetic base according to any one of embodiments 1 to 5, wherein the viscosity at 30℃ is 10,000 mPa·s or less. <Aspect 7> The cosmetic base according to any one of embodiments 1 to 6, wherein component (A) comprises at least one selected from the group consisting of (ammonium acryloyldimethyltaurate / beheneth-25 methacrylate) crosspolymer, (ammonium acryloyldimethyltaurate / VP) copolymer, (dimethylacrylamide / sodium acryloyldimethyltaurate) crosspolymer, (sodium acrylate / sodium acryloyldimethyltaurate) copolymer, and (hydroxyethyl acrylate / sodium acryloyldimethyltaurate) copolymer. <Aspect 8> The cosmetic base according to any one of embodiments 1 to 7, wherein component (B) comprises at least one selected from the group consisting of glycerin, dipropylene glycol, and diglycerin. <Pattern 9> The cosmetic base according to any one of embodiments 1 to 8, wherein the pigment particles include at least one selected from the group consisting of titanium dioxide, zinc oxide, and iron oxide. <Aspect 10> The cosmetic base according to any one of embodiments 1 to 9, further comprising (D) silica particles whose surface has been hydrophobized in the oily medium. <Aspect 11> The cosmetic base according to any one of Aspects 1 to 10, which is for pore correction and / or pore moisturization. <Aspect 12> An oil-in-water type emulsified cosmetic containing the cosmetic base according to any one of Aspects 1 to 11. <Aspect 13> Blending the component (A) and the component (B) to obtain a blend, and Dispersing the blend in the oily medium A method for producing the cosmetic base according to any one of Aspects 1 to 11, comprising:

Advantages of the Invention

[0013] According to the present invention, it is possible to provide a novel cosmetic base in which the pore correction effect can be improved more than before even when using pigment particles of the same level as or less than before.

[0014] Also, according to the present invention, it is possible to provide a cosmetic containing the above novel cosmetic base.

[0015] Furthermore, according to the present invention, it is possible to provide a method for producing the above novel cosmetic base.

Modes for Carrying Out the Invention

[0016] Hereinafter, embodiments of the present invention will be described in detail. Note that the present invention is not limited to the following embodiments and can be variously modified and implemented within the scope of the gist of the invention.

[0017] 《Cosmetic Base》 The cosmetic base of the present invention (hereinafter, also simply referred to as "the base of the present invention") is A cosmetic base containing the following components in an oily medium: (A) A water-soluble copolymer based on acryloyldimethyltaurine, (B) At least one of a humectant and water, and (C) Pigment particles whose surface is hydrophobically treated.

[0018] In this invention, "cosmetic base" refers to a part of the components that make up a cosmetic, and may be, for example, components that provide the overall characteristics or specific functions of the cosmetic, or components that support the feel, stability, etc., of the cosmetic. The cosmetic base may include oily components, aqueous components, or powder components.

[0019] The base of the present invention may be an oily cosmetic base. The base of the present invention contains the above-mentioned specific components (A) to (C) in an oily medium, thereby improving the pore correction effect compared to conventional methods, even when using the same amount or fewer pigment particles as in conventional methods.

[0020] In particular, through the inventors' diligent research, it has been found that in the base of the present invention, the pore-correcting effect can be further improved by including a specific component (B) as a humectant, and by having at least a portion of component (A) and at least a portion of component (B) as a blend.

[0021] The following describes in detail each component that may be included in the base material of the present invention.

[0022] <Ingredient (A)> The base material of the present invention contains a water-soluble copolymer based on acryloyldimethyltaurine as component (A).

[0023] Water-soluble copolymers based on acryloyldimethyltaurine are generally water-soluble and are often compounded in aqueous solvents (e.g., water). Such water-soluble copolymers are known to be mainly used as water-soluble viscosity modifiers and thickeners. In contrast, the base material of the present invention contains such a water-soluble copolymer dispersed in an oily medium.

[0024] In the present invention, component (A) is not particularly limited and may include, for example, at least one selected from the group consisting of (ammonium acryloyldimethyltaurate / beheneth-25 methacrylate) crosspolymer, (ammonium acryloyldimethyltaurate / VP) copolymer, (dimethylacrylamide / sodium acryloyldimethyltaurate) crosspolymer, (sodium acrylate / sodium acryloyldimethyltaurate) copolymer, and (hydroxyethyl acrylate / sodium acryloyldimethyltaurate) copolymer.

[0025] (Acryloyldimethyltaurate ammonium / methacrylate beheneth-25) crosspolymer is a copolymer of acryloyldimethyltaurate ammonium and methacrylate beheneth-25, has a crosspolymer structure, and is commercially available.

[0026] (Acryloyldimethyltaurate ammonium / VP) copolymer is a copolymer of acryloyldimethyltaurate ammonium and vinylpyrrolidone (VP), and is commercially available.

[0027] (Dimethylacrylamide / Sodium Acryloyldimethyltaurate) crosspolymer is a crosspolymer of dimethylacrylamide and sodium acryloyldimethyltaurate, and is commercially available.

[0028] Sodium acrylate / sodium acryloyldimethyl taurate copolymer is a copolymer of sodium acrylate and sodium acryloyldimethyl taurate, and is available commercially.

[0029] (Hydroxyethyl acrylate / sodium acryloyldimethyl taurate) copolymer is a copolymer of hydroxyethyl acrylate and sodium acryloyldimethyl taurate, and is available commercially.

[0030] Furthermore, any commercially available water-soluble copolymer described above may contain, for example, water, oil, and / or a surfactant, to the extent that it does not impair the effects of the present invention.

[0031] In the base material of the present invention, the content range of component (A) is not particularly limited. For example, the content of component (A) may be 0.1% by mass or more, 0.2% by mass or more, 0.3% by mass or more, 0.4% by mass or more, 0.5% by mass or more, 0.6% by mass or more, 0.7% by mass or more, 0.8% by mass or more, 0.9% by mass or more, 1.0% by mass or more, 1.1% by mass or more, 1.2% by mass or more, 1.3% by mass or more, 1.4% by mass or more, 1.5% by mass or more, 1.6% by mass or more, 1.7% by mass or more, 1.8% by mass or more, 1.9% by mass or more, or 2. 0 mass% or more, and 3.0 mass% or less, 2.9 mass% or less, 2.8 mass% or less, 2.7 mass% or less, 2.6 mass% or less, 2.5 mass% or less, 2.4 mass% or less, 2.3 mass% or less, 2.2 mass% or less, 2.1 mass% or less, It may be 2.0 mass% or less, 1.9 mass% or less, 1.8 mass% or less, 1.7 mass% or less, 1.6 mass% or less, 1.5 mass% or less, 1.4 mass% or less, 1.3 mass% or less, 1.2 mass% or less, 1.1 mass% or less, or 1.0 mass% or less.

[0032] <Component (B)> The base of the present invention contains at least one of a humectant and water as component (B). That is, the base of the present invention may contain only a humectant, only water, or both a humectant and water as component (B). As mentioned above, if water is contained in the product of component (A) used, such water may be considered as component (B) as referred to herein. When the base of the present invention is incorporated into a cosmetic composition described later, for example, water incorporated as an aqueous phase component in a water-in-oil emulsion cosmetic composition may be considered as component (B) of the present invention. Furthermore, water incorporated as an aqueous phase component in an oil-in-water emulsion cosmetic composition is present in the outer phase and is therefore distinguished from component (B) of the present invention which is present in the inner phase.

[0033] In the present invention, water is not particularly limited and may be, for example, water used in cosmetics and quasi-drugs. Specifically, as water, for example, deionized water, distilled water, ultrapure water, and tap water can be used.

[0034] In the present invention, the humectant is not particularly limited and may include, for example, at least one selected from the group consisting of glycerin, dipropylene glycol, diglycerin, and 1,3-butylene glycol. Of these, from the viewpoint described below, for example, component (B) is preferably selected from the group consisting of glycerin, dipropylene glycol, and diglycerin.

[0035] In the present invention, component (B) preferably contains a humectant. When component (B) contains a humectant in the base of the present invention, a moisturizing effect can be obtained. Furthermore, when component (B) contains a humectant, at least a portion of component (A) and at least a portion of component (B) can form a blend (hereinafter also referred to as "the blend of the present invention"). The average particle size of the blend of the present invention may be larger than the average particle size of conventional pigment particles, but smaller than the pores of the skin. Therefore, the blend of the present invention can fill pores, thereby further improving the pore correction effect compared to the conventional case, even when using the same amount or fewer pigment particles as conventional pore-minimizing cosmetics. In other words, by using the blend of the present invention in combination with component (C) (pigment particles whose surface has been hydrophobized), the pore correction effect can be improved more significantly compared to the conventional case.

[0036] Furthermore, the blend of the present invention may be formed from at least a portion of component (A) and at least a portion of component (B). For example, it may contain at least a portion of component (A) and all of component (B), all of component (A) and at least a portion of component (B), or all of component (A) and all of component (B). Also, the shape of the blend of the present invention is not particularly limited and may be particulate, for example. The average particle diameter of the blend of the present invention is not particularly limited and may be, for example, 1 μm or more, 2 μm or more, 5 μm or more, 10 μm or more, 20 μm or more, 30 μm or more, 40 μm or more, or 50 μm or more, or 100 μm or less, 90 μm or less, or 80 μm or less. Regarding the average particle diameter of the blend of the present invention, for example, the average value of the long axes of 10 blend particles observed with an optical microscope can be used as the average particle diameter.

[0037] In the base material of the present invention, the content range of component (B) is not particularly limited. For example, the content of component (B) may be 1.0% by mass or more, 5.0% by mass or more, 10% by mass or more, 12% by mass or more, or 15% by mass or more, relative to the total of the oily medium and components (A) to (C), or it may be 30% by mass or less, 25% by mass or less, 20% by mass or less, or 18% by mass or less.

[0038] Furthermore, in the base of the present invention, with respect to 1.0 part by mass of component (A) described above, component (B) (preferably a humectant as component (B)) may be 6.0 parts by mass or more, 10 parts by mass or more, 15 parts by mass or more, 20 parts by mass or more, 25 parts by mass or more, 30 parts by mass or more, 35 parts by mass or more, 40 parts by mass or more, 45 parts by mass or more, 50 parts by mass or more, 55 parts by mass or more, 60 parts by mass or more, 65 parts by mass or more, 70 parts by mass or more, 75 parts by mass or more, 80 parts by mass or more, 85 parts by mass or more, 90 parts by mass or more, 9 It may be 5 parts by mass or more, or 100 parts by mass or more, and 120 parts by mass or less, 110 parts by mass or less, 100 parts by mass or less, 95 parts by mass or less, 90 parts by mass or less, 85 parts by mass or less, 80 parts by mass or less, 75 parts by mass or less, 70 parts by mass or less, 6 It may be 5 parts by weight or less, 60 parts by weight or less, 55 parts by weight or less, 50 parts by weight or less, 45 parts by weight or less, 40 parts by weight or less, 35 parts by weight or less, 30 parts by weight or less, 25 parts by weight or less, 20 parts by weight or less, 15 parts by weight or less, or 10 parts by weight or less.

[0039] Furthermore, if ingredient (B) contains both a humectant and water, the total content range of the humectant and water may be the same as the content range of ingredient (B) described above.

[0040] <Component (C)> The base material of the present invention includes, as component (C), pigment particles whose surface has been hydrophobized. Hereinafter, the pigment particles whose surface has been hydrophobized will also be simply referred to as "the pigment particles of the present invention."

[0041] The base material of the present invention, by containing the pigment particles of the present invention, allows the pigment particles to penetrate pores and reflect and diffuse light, thereby exhibiting an effect of blurring the shadows of pores.

[0042] The pigment particles of the present invention have a hydrophobic surface. That is, at least a portion of the surface of the pigment particles of the present invention is hydrophobic. Examples of hydrophobic treatments include, but are not limited to, metal soap treatment, fatty acid ester treatment, silicone treatment, alkylsilane treatment, and amino acid treatment. The pigment particles of the present invention may use only one of these hydrophobicly treated materials, or two or more materials.

[0043] The average particle diameter of the pigment particles of the present invention is not particularly limited and may be, for example, 100 nm or more, 150 nm or more, or 200 nm or more, or 400 nm or less, 350 nm or less, or 300 nm or less. The average particle diameter of the pigment particles can be calculated, for example, as the equivalent diameter of the projected area circle of the primary particles observed by SEM or TEM.

[0044] In the present invention, the pigment particles are not particularly limited in type and may include, for example, at least one selected from the group consisting of titanium dioxide, zinc oxide, and iron oxide.

[0045] In the base material of the present invention, the content range of component (C) is not particularly limited. For example, the content of component (C) may be 0.1% by mass or more, 0.3% by mass or more, 0.5% by mass or more, 1.0% by mass or more, 1.5% by mass or more, 2.0% by mass or more, 2.5% by mass or more, 3.0% by mass or more, 3.5% by mass or more, 4.0% by mass or more, 4.5% by mass or more, 5.0% by mass or more, 5.5% by mass or more, 6.0% by mass or more, 6.5% by mass or more, 7.0% by mass or more, or 7.5% by mass or more, relative to the total of the oily medium and components (A) to (C). Alternatively, it may be 12% by mass or less, 10% by mass or less, 9.0% by mass or less, 8.0% by mass or less, 5.0% by mass or less, or 1.0% by mass or less.

[0046] <Oil-based medium> The base of the present invention includes an oily medium. The oily medium is mainly composed of oil and may be liquid, solid, or semi-solid oil or a mixture thereof at room temperature (25°C) and atmospheric pressure (1 atm), and is a medium for dispersing components (A) to (C) of the present invention.

[0047] The base of the present invention comprises one or more oily media. The oily media may be non-volatile oils, volatile oils, or mixtures thereof. In the present invention, non-volatile oils refer to oils with a boiling point exceeding 260°C at room temperature and pressure. In contrast, volatile oils refer to oils with a boiling point between 60°C and 260°C at room temperature and pressure.

[0048] Furthermore, in the present invention, if the oily medium contains both non-volatile oil and volatile oil, the content ratio of non-volatile oil to volatile oil (mass of non-volatile oil:mass of volatile oil) is not particularly limited and may be in the range of, for example, 1:99 to 99:1, 10:90 to 90:10, 20:80 to 80:20, 30:70 to 70:30, 40:60 to 60:40, or 45:55 to 55:45.

[0049] In the present invention, specific examples of oils are not particularly limited and include hydrocarbon oils, ester oils, vegetable oils, higher alcohols, higher fatty acids, oily ultraviolet absorbers, and silicone oils.

[0050] Examples of non-volatile hydrocarbon oils include, but are not limited to, liquid paraffin, paraffin, hydrogenated polydecene, squalane, squalene, pristane, and petrolatum. As volatile hydrocarbon oils, relatively low molecular weight hydrocarbon oils (boiling point of 250°C or less) can be used, and specifically include, but are not limited to, light fluid isoparaffin (also called "hydrogenated polyisobutene"), isododecane, and isohexadecane.

[0051] As for ester oils, isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di2-ethylhexanoate, dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glycerin di2-heptylundecanoate, trimethylolpropane tri2-ethylhexanoate, trimethylolpropane triisostearate, glycerin trioctanoate, Examples include, but are not limited to, glyceryl triisopalmitate, cetyl 2-ethylhexanoate, pentaerythritol tetra-2-ethylhexanoate, glyceryl tri-2-ethylhexanoate, 2-ethylhexyl palmitate, glyceryl trimyristate, glyceride tri-2-heptylundecanoate, methyl castor oil fatty acid ester, oleyl oleate, acetoglyceride, 2-heptylundecyl palmitate, diisobutyl adipate, 2-octyldodecyl N-lauroyl-L-glutamate, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, di-2-hexyldecyl adipate, diisopropyl sebacate, and triethyl citrate.

[0052] Examples of vegetable oils include, but are not limited to, avocado oil, camellia oil, macadamia nut oil, corn oil, olive oil, rapeseed oil, sesame oil, castor oil, peanut oil, almond oil, soybean oil, tea seed oil, jojoba oil, and wheat germ oil.

[0053] Examples of higher alcohols include oleyl alcohol, isostearyl alcohol, octyldodecanol, decyltetradecanol, jojoba alcohol, cetyl alcohol, behenyl alcohol, stearyl alcohol, and myristyl alcohol. Examples of higher fatty acids include, but are not limited to, oleic acid, isostearic acid, linoleic acid, linolenic acid, eicosapentaenoic acid, docosahexaenoic acid, palmitic acid, behenic acid, and stearic acid.

[0054] The oil-based UV absorbers are not particularly limited as long as they are commonly used in cosmetics. For example, UV absorbers selected from octocrylene, ethylhexyl methoxycinnamate, ethylhexyl salicylate, 4-tert-butyl-4'-methoxydibenzoylmethane, methylenebisbenzotriazolyltetramethylbutylphenol, bisethylhexyloxyphenol methoxyphenyl triazine, diethylamino hydroxybenzoyl hexyl benzoate, ethylhexyl triazone, diethylhexylbutamide triazone, 2-hydroxy-4-methoxybenzophenone, benzalmalonate, benzotriazole, etc., can be used in appropriate combinations.

[0055] The silicone oil may be selected from volatile and non-volatile linear, branched, or cyclic silicone oils. More specifically, examples of silicone oils include, but are not limited to, methylpolysiloxane (also called "dimethicone"), caprylyl methicone, methylphenylpolysiloxane, methylpolycyclosiloxane, methylhydrogenpolysiloxane, dimethylsiloxane, dimethylsiloxane-methyl (POE)siloxane copolymer, highly polymerized methylpolysiloxane, dimethylsiloxane-methyl (POP)siloxane copolymer, tetradecamethylhexasiloxane, octamethyltrisiloxane, dimethylsiloxane-methylcetyloxysiloxane copolymer, decamethyltetrasiloxane, cyclopentasiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, hexadecamethylcycloheptasiloxane, etc.

[0056] In the base material of the present invention, the range of oily media content is not particularly limited. For example, the oily media content may be 50% by mass or more, 55% by mass or more, 60% by mass or more, 65% by mass or more, 70% by mass or more, 75% by mass or more, or 80% by mass or more, relative to the total of the oily media and components (A) to (C), or it may be 98% by mass or less, 95% by mass or less, 90% by mass or less, 85% by mass or less, 80% by mass or less, or 75% by mass or less.

[0057] <Other ingredients> The base of the present invention may further contain other components in addition to the components (A) to (C) described above, as long as it does not impair the effects of the present invention. The following is an illustrative description of these other components, but the present invention is not limited to these other components.

[0058] <Component (D)> The base material of the present invention may further contain, as other components, (D) silica particles whose surface has been hydrophobized.

[0059] From the viewpoint that silica particles with a hydrophobic surface treatment can fill pores in the skin and also absorb sebum, it is preferable that the base of the present invention contains silica particles with a hydrophobic surface treatment.

[0060] Silica particles with a hydrophobic surface treatment may have at least a portion of their surface treated with a hydrophobic agent. Examples of hydrophobic treatments include, but are not limited to, metal soap treatment, fatty acid ester treatment, silicone treatment, alkylsilane treatment, and amino acid treatment. Furthermore, only one type of these hydrophobicly treated silica particles may be used, or two or more types may be used.

[0061] The average particle diameter of silica particles whose surface has been hydrophobized as component (D) is not particularly limited and may be, for example, 2 μm or more, 3 μm or more, or 5 μm or more, or 50 μm or less, 30 μm or less, 10 μm or less, 5 μm or less, 1 μm or less, 500 nm or less, 400 nm or less, 350 nm or less, or 300 nm or less. The average particle diameter of pigment particles can be calculated, for example, as the equivalent diameter of the projected area circle of primary particles observed by SEM or TEM.

[0062] In the base material of the present invention, the range of content of component (D), if it is included, is not particularly limited. For example, the content of component (D) may be 2.0 parts by mass or more, 3.0 parts by mass or more, or 4.0 parts by mass or more, or 50 parts by mass or less, 40 parts by mass or less, or 30 parts by mass or less, based on 100 parts by mass of the total of the oily medium and components (A) to (C).

[0063] Method for producing the base material of the present invention The present invention can provide a method for producing the base material of the present invention as described above.

[0064] More specifically, the method for producing the base material of the present invention (hereinafter also simply referred to as "the method for producing the present invention") is: The above-mentioned component (A) and component (B) are blended to obtain a blended product, and Disperse the aforementioned blend in an oily medium. Manufacturing method That's fine.

[0065] (a) Process to obtain the blended product (a) The process of obtaining the blended product is to blend component (A) and component (B) as described above to obtain the blended product. Component (A) and component (B) are as described above and will not be explained here.

[0066] Here, it is preferable that component (B) described above includes the humectant described above.

[0067] Blending can also be done, for example, by mixing or stirring.

[0068] (b) Step of dispersing the blend in an oily medium. (a) The step of obtaining the blend is to disperse the blend, which consists of the above-mentioned component (A) and component (B), in an oily medium. The oily medium is as described above and will not be explained here.

[0069] Dispersion can be carried out, for example, at room temperature, or more specifically, at 20-27°C or 20-25°C.

[0070] Uses and properties of the base material of the present invention As described above, the base material of the present invention can improve the pore-correcting effect compared to conventional methods, even when using the same amount or fewer pigment particles as conventional methods.

[0071] Therefore, the base of the present invention can be suitably used for pore correction. If the base of the present invention contains a moisturizer, it can also be suitably used for pore moisturizing, and can be used for both pore correction and pore moisturizing. Note that "pore correction" or "pore correction" means making the unevenness of pores less noticeable.

[0072] The base of the present invention preferably has a viscosity of 10,000 mPa·s or less at 30°C, and more specifically, it may be, for example, 100,000 mPa·s or less, 80,000 mPa·s or less, 50,000 mPa·s or less, 10,000 mPa·s or less, 8,000 mPa·s or less, 5,000 mPa·s or less, or 1,000 mPa·s or less. A viscosity of 100,000 mPa·s or less allows the base of the present invention to penetrate the pores more easily, and as a result, the pore correction effect can be further improved. Furthermore, the viscosity of the base of the present invention is preferably 100 mPa·s or more. In addition, in the present invention, viscosity may be measured, for example, using a BL-type viscometer (VS-A type, manufactured by Shibaura Systems Co., Ltd., 30°C) under measurement conditions of 12 rpm and 1 minute using rotor No. 3.

[0073] The state of the base material of the present invention is not particularly limited and may be, for example, liquid, semi-solid, gel, mist, or mousse.

[0074] Cosmetics The present invention can also provide a cosmetic composition containing the base material of the present invention described above (hereinafter also simply referred to as "the cosmetic composition of the present invention").

[0075] In the cosmetic composition of the present invention, the content range of the base of the present invention is not particularly limited. The content of the base of the present invention may be, for example, an amount such that the total of components (A) to (C) of the present invention in the entire cosmetic composition is 10 to 80% by mass, 15 to 75% by mass, or 20 to 70% by mass. In addition to the cosmetic base of the present invention described above, the cosmetic composition of the present invention may further contain one or more other components commonly used in topical skin preparations such as cosmetics and pharmaceuticals.

[0076] Other ingredients include, but are not limited to, other powdered components, liquid oils and fats, solid oils and fats, waxes, hydrocarbons, higher fatty acids, higher alcohols, esters, silicones, anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, water-soluble polymers, film-forming agents, UV protection agents, metal ion chelating agents, lower alcohols, polyhydric alcohols, sugars, amino acids, organic amines, polymer emulsions, pH adjusters, skin nutrients, vitamins, antioxidants, antioxidant aids, fragrances, water, etc.

[0077] The dosage form of the cosmetic composition of the present invention is not particularly limited and may be, for example, a solution system, a solubilized system, an emulsion system (water-in-oil emulsion system or oil-in-water emulsion system, preferably water-in-oil emulsion system), a powder dispersion system, a water-oil two-layer system, a water-oil-powder three-layer system, a gel, a mist, a spray, a mousse, or a roll-on, or it may be a formulation impregnated or coated onto a sheet such as a nonwoven fabric.

[0078] Furthermore, the product form of the cosmetic composition of the present invention is not particularly limited and may be, for example, a facial cosmetic such as lotion, emulsion, serum, cream, or pack; a makeup cosmetic such as makeup base or foundation; or a sunscreen cosmetic (sunscreen agent). [Examples]

[0079] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. Unless otherwise specified, the content is given in mass percent.

[0080] Examples 2-12 and Comparative Example 1 Based on the formulations in Tables 1 and 2, water-in-oil emulsion cosmetics (liquid) for Examples 1-12 and Comparative Example 1 were prepared.

[0081] Each prepared cosmetic product was comprehensively evaluated by 10 expert panelists for its pore-correcting effect and natural finish effect, according to the following criteria. The evaluation results are shown in Tables 1 and 2. <Evaluation Criteria for Pore Correction Effect> "A": Has a very high pore-correcting effect; "B": Has a pore-correcting effect; "C": Has a slight pore-correcting effect; "D": No pore-correcting effect.

[0082] <Evaluation Criteria for Natural-Looking Finish> "A": Natural; "B": Slight white cast is visible; "C": There is a white cast.

[0083] [Table 1]

[0084] [Table 2] As is clear from the results in Tables 1 and 2, the compositions of Examples 1 to 12, and especially the compositions of Examples 2 to 12, all showed a higher pore-correcting effect compared to Comparative Example 1.

[0085] Examples 13-17 and Comparative Examples 2-5 Based on the formulations in Table 3, water-in-oil emulsion cosmetics (liquid) for Examples 13-17 and Comparative Examples 2-5 were prepared.

[0086] For each prepared cosmetic product, the pore-correcting effect and natural finish effect were evaluated in the same manner as described above. The evaluation results are shown in Table 3.

[0087] [Table 3]

[0088] As is clear from the results in Table 3, the compositions of Examples 13 to 17 all showed a higher pore-correcting effect compared to Comparative Examples 2 to 5.

Claims

1. A cosmetic base comprising the following components (A) to (C) in an oily medium: (A) Water-soluble copolymer based on acryloyldimethyltaurine, (B) At least one of a humectant and water, (C) Pigment particles whose surfaces have been treated to be hydrophobic.

2. The above component (B) includes the above humectant, At least a portion of component (A) and at least a portion of component (B) are in a blend. The cosmetic base according to claim 1.

3. The cosmetic base according to claim 1, wherein the content of component (A) is 0.1 to 3.0% by mass.

4. The cosmetic base according to claim 1, wherein the content of component (B) is 0.1 to 50% by mass.

5. The cosmetic base according to claim 1, wherein the amount of component (B) is 6.0 to 120 parts by mass per 1.0 part by mass of component (A).

6. The cosmetic base according to claim 1, wherein the viscosity at 30°C is 10,000 mPa·s or less.

7. The cosmetic base according to claim 1, wherein component (A) comprises at least one selected from the group consisting of (ammonium acryloyldimethyltaurate / beheneth-25 methacrylate) crosspolymer, (ammonium acryloyldimethyltaurate / VP) copolymer, (dimethylacrylamide / sodium acryloyldimethyltaurate) crosspolymer, (sodium acrylate / sodium acryloyldimethyltaurate) copolymer, and (hydroxyethyl acrylate / sodium acryloyldimethyltaurate) copolymer.

8. The cosmetic base according to claim 1, wherein component (B) comprises at least one selected from the group consisting of glycerin, dipropylene glycol, and diglycerin.

9. The cosmetic base according to claim 1, wherein the pigment particles include at least one selected from the group consisting of titanium dioxide, zinc oxide, and iron oxide.

10. The cosmetic base according to claim 1, further comprising (D) silica particles whose surface has been hydrophobized in the oily medium.

11. A cosmetic base according to claim 1, which is for pore correction and / or pore moisturizing.

12. A water-in-oil emulsion cosmetic comprising the cosmetic base described in any one of claims 1 to 11.

13. To obtain a blend by blending the aforementioned component (A) and the aforementioned component (B), and Disperse the blend in the oily medium. A method for producing a cosmetic base according to any one of claims 1 to 11, including the method described above.

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