Oil-in-water emulsion cosmetic composition

Abstract

The present invention provides an oil-in-water emulsion cosmetic composition that allows for the stable incorporation of pigment particles surface-treated with a metal soap-based surface treatment agent into emulsion particles, exhibits excellent high-temperature and long-term stability, and also offers excellent usability (particularly in terms of freshness). [Solution] An oil-in-water emulsion cosmetic composition comprising an oil phase component and an aqueous phase component, wherein the oil phase component comprises pigment particles whose surface is treated with a metal soap, isostearic acid, and liquid oil, the pigment particles are dispersed in the liquid oil, and 50% by mass or more of the liquid oil is volatile silicone oil.

Description

Technical Field

[0001] The present invention relates to an oil-in-water type emulsified cosmetic composition.

Background Art

[0002] An oil-in-water type emulsified cosmetic composition containing an aqueous phase as a continuous phase gives a fresh and refreshing feeling of use, and thus is widely used as a base material for, for example, makeup cosmetics such as foundations, base cosmetics, sunscreen agents, or basic cosmetics such as emulsions.

[0003] For example, in Patent Document 1, (A) a pigment surface-treated with a surface treatment agent containing glutamic acid or aspartic acid acylated with a saturated fatty acid having 8 to 14 carbon atoms or a salt thereof, (B) an oil component, (C) a hydrophobic ultraviolet scattering agent, and (D) a water-soluble alkyl-substituted polysaccharide derivative, wherein the blending amount of the ultraviolet absorber is less than 1% by mass based on the total amount of the cosmetic, the silicone oil is 10% by mass or less based on the total amount of the cosmetic, and the components (A) and (C) are dispersed in the oil phase, an oil-in-water type emulsified cosmetic is disclosed. }

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In an oil-in-water type emulsified cosmetic composition, it is known to incorporate surface-treated pigment particles into emulsified particles (oil droplets).

[0006] Generally, when attempting to incorporate such pigment particles into emulsion particles (oil droplets), it is difficult to incorporate the pigment particles into the emulsion particles in the first place, and even if it is possible to incorporate them, it is difficult to maintain the stability of the resulting emulsion cosmetic composition.

[0007] To address this problem, for example, as disclosed in Patent Document 1, pigment particles surface-treated with an amino acid-based surface treatment agent are incorporated into the emulsion particles, thereby achieving stable maintenance of the emulsion cosmetic composition.

[0008] However, maintaining the stability of emulsified cosmetic compositions containing pigment particles surface-treated with metal soap-based surface treatment agents, particularly at high temperatures (e.g., 50°C), remained difficult.

[0009] The present invention aims to improve upon the above circumstances, and its objective is to provide an oil-in-water emulsion cosmetic composition that can stably incorporate pigment particles surface-treated with a metal soap-based surface treatment agent into emulsion particles, exhibits excellent high-temperature and long-term stability, and also has excellent usability (particularly in terms of freshness).

[0010] Furthermore, the present invention also provides a makeup cosmetic having the above-mentioned effects. [Means for solving the problem]

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

[0012] <Aspect 1> An oil-in-water emulsion cosmetic composition comprising an oil phase component and an aqueous phase component, The oil phase component comprises pigment particles whose surface is treated with a metal soap, isostearic acid, and liquid oil. The pigment particles are dispersed in the liquid oil, and 50% by mass or more of the liquid oil is volatile silicone oil. composition. <Aspect 2> The composition according to embodiment 1, wherein the metal soap comprises at least one selected from the group consisting of magnesium stearate, calcium stearate, zinc myristate, and aluminum dimyristate. <Aspect 3> The composition according to embodiment 1 or 2, wherein the amount of pigment particles is 1.0 to 150 parts by mass per 100 parts by mass of liquid oil. <Aspect 4> A composition according to any one of embodiments 1 to 3, further comprising a nonionic surfactant. <Aspect 5> The composition according to any one of embodiments 1 to 4, wherein the aqueous phase component contains a water-soluble active ingredient. <Pattern 6> The composition according to embodiment 5, wherein the water-soluble active ingredient comprises at least one selected from the group consisting of alkoxysalicylic acid or a salt thereof, 1-piperidinepropionic acid or a salt thereof, neutral amino acids or peptides thereof, vitamin A group or derivatives thereof, vitamin B group or derivatives thereof, plant extracts, tranexamic acid or derivatives thereof, and fermentation extracts. <Aspect 7> A makeup cosmetic comprising the composition described in any one of the embodiments 1 to 6. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide an oil-in-water emulsion cosmetic composition in which pigment particles surface-treated with a metal soap-based surface treatment agent can be stably incorporated into emulsion particles, and which also exhibits excellent stability at high temperatures over time, as well as excellent usability (particularly in terms of freshness).

[0014] Furthermore, according to the present invention, it is also possible to provide a makeup cosmetic having the above-mentioned effects. [Modes for carrying out the invention]

[0015] The embodiments of the present invention will be described in detail below. However, the present invention is not limited to the embodiments described below, and can be implemented with various modifications within the scope of the essence of the invention.

[0016] "Oil-in-Water Emulsion Cosmetic Composition" The oil-in-water emulsion cosmetic composition of the present invention (hereinafter, also simply referred to as "the composition of the present invention") is an oil-in-water emulsion cosmetic composition containing an oil phase component and an aqueous phase component, where the oil phase component contains pigment particles at least partially treated with a metal soap on the surface, isostearic acid, and a liquid oil component, the pigment particles are dispersed in the liquid oil component, and 50% by mass or more of the liquid oil component is a volatile silicone oil, Composition is.

[0017] As described above, heretofore, there has been a problem that it is difficult to stably maintain an emulsion cosmetic composition in which pigment particles surface-treated with a metal soap-based surface treatment agent are incorporated into emulsion particles, particularly when maintained at a high temperature.

[0018] In response to this problem, due to its unique configuration, the composition of the present invention can stably incorporate pigment particles (hereinafter, also referred to as "pigment particles according to the present invention") treated with a metal soap-based surface treatment agent into emulsion particles (i.e., oil droplets), and can maintain emulsion stability particularly at high temperatures. Although not limited to theory, the effect of the present invention is considered to be due to the following mechanism.

[0019] That is, by incorporating isostearic acid together with the pigment particles according to the present invention into the oil phase component, the pigment particles according to the present invention can be dispersed in the liquid oil component and stably present within the emulsion particles, i.e., within the oil droplets. As a result, it is considered that the emulsion stability of the emulsion particles in the composition of the present invention, particularly the emulsion stability at high temperatures, can be maintained well.

[0020] Moreover, since the composition of the present invention is an oil-in-water emulsion cosmetic composition, it also has an excellent feeling of use of freshness.

[0021] The following describes in detail each component that may constitute the composition of the present invention.

[0022] <Oil phase components> The composition of the present invention contains an oil phase component. The oil phase component constitutes the internal phase of the composition of the present invention.

[0023] In the composition of the present invention, the oil phase component comprises pigment particles according to the present invention, isostearic acid, and liquid oil. The pigment particles according to the present invention are dispersed in the liquid oil.

[0024] Furthermore, whether or not the pigment particles according to the present invention are dispersed in the liquid oil can be confirmed, for example, by evaluating the emulsification performed in the examples. If the pigment particles are not dispersed in the liquid oil (for example, in an aggregated state), emulsification will be difficult. Therefore, if emulsification is possible, it is considered to suggest that the pigment particles are dispersed in the liquid oil.

[0025] (Pigment particles) The pigment particles according to the present invention have at least a portion of their surface treated with a metal soap.

[0026] In the present invention, any pigment particles can be used for surface treatment, regardless of their shape (spherical, rod-shaped, needle-shaped, plate-shaped, irregular shape, flake-shaped, spindle-shaped, etc.), particle size (fuzzy, fine particles, pigment grade, etc.), or particle structure (porous, non-porous, etc.). Examples include, but are not limited to, inorganic pigment powders (including natural mineral pigments or synthetic inorganic pigments, etc.), organic dyes, and organic pigment particles.

[0027] More specifically, examples of inorganic pigments include, but are not limited to, titanium dioxide, yellow iron oxide, red iron oxide, black iron oxide, talc, zinc oxide, silicon dioxide, pearl mica, mica, carbon black, red iron oxide, cerium oxide, manganese violet, cobalt violet, chromium oxide, chromium hydroxide, cobalt titanate, ultramarine, Prussian blue, magnesium oxide, zirconium oxide, kaolin, sericite, muscovite, phlogopite, synthetic mica, red mica, biotite, and vermiculite.

[0028] Examples of organic dyes include, but are not limited to, Red No. 3, Red No. 10, Red No. 106, Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 226, Red No. 227, Red No. 228, Red No. 230, Red No. 401, Red No. 405, Red No. 505, Yellow No. 4, Yellow No. 5, Yellow No. 202, Yellow No. 203, Yellow No. 205, Yellow No. 401, Orange No. 201, Orange No. 203, Orange No. 204, Orange No. 205, Orange No. 206, Orange No. 207, Blue No. 1, Blue No. 2, Blue No. 201, Blue No. 404, Green No. 3, Green No. 201, Green No. 204, and Green No. 205.

[0029] Examples of organic pigment powders include, but are not limited to, tar pigments, nylon powder, cellulose powder, polyethylene powder, polymethyl methacrylate powder, polystyrene powder, acrylic powder, and silicone powder.

[0030] Furthermore, these pigment particles can be used individually or in combination.

[0031] In the present invention, from the viewpoint of using the pigment particles in makeup cosmetics such as foundation, eyeshadow, eyebrow, and blush, the pigment particles among the above-mentioned examples may include at least one selected from the group consisting of titanium dioxide, yellow iron oxide, red iron oxide, black iron oxide, talc, zinc oxide, silicon dioxide, pearl mica, mica, and sericite.

[0032] The metal soap surface treatment agent, which is a surface treatment agent for pigment particles according to the present invention, is not particularly limited and may include, for example, a salt of a higher fatty acid with an alkali metal such as sodium or potassium, or a salt of a higher fatty acid with a divalent or trivalent metal (non-alkali metal) such as calcium, zinc, magnesium, or aluminum.

[0033] In the present invention, the higher fatty acid relating to the metal soap surface treatment agent is not particularly limited and may be, for example, a linear or branched saturated or unsaturated higher fatty acid having about 6 to 24 carbon atoms. Specifically, examples include lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, ricinoleic acid, and the like.

[0034] Furthermore, examples of metals that form salts with the above-mentioned higher fatty acids include alkali metals such as sodium and potassium, and divalent or trivalent non-alkali metals, such as calcium, magnesium, lithium, barium, and zinc.

[0035] In the present invention, the metal soap surface treatment agent may include, for example, at least one selected from the group consisting of magnesium stearate, calcium stearate, zinc myristate, and aluminum dimyristate.

[0036] In the composition of the present invention, the content of the pigment particles according to the present invention is not particularly limited and may be adjusted as follows, for example.

[0037] The content of the pigment particles according to the present invention relative to the total amount of the composition of the present invention may be, for example, 1.0% by mass or more, 5.0% by mass or more, 8.0% by mass or more, 10% by mass or more, 12% by mass or more, 14% by mass or more, or 16% by mass or more, or 30% by mass or less, 25% by mass or less, 20% by mass or less, or 18% by mass or less.

[0038] Furthermore, the content of the pigment particles according to the present invention with respect to 100 parts by mass of liquid oil as described later may be 1.0 part by mass or more, 5.0 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, or 85 parts by mass or more, and may also be 150 parts by mass or less, 120 parts by mass or less, 100 parts by mass or less, 95 parts by mass or less, or 90 parts by mass or less.

[0039] In this invention, if the content of a component includes multiple types belonging to the same component, the total amount of those types shall be used.

[0040] (Isostearic acid) Isostearic acid refers to a saturated fatty acid with 18 carbon atoms and a branched structure. In this invention, liquid isostearic acid is excluded from the "liquid oil" described later.

[0041] In the composition of the present invention, the content of isostearic acid is not particularly limited and may be adjusted as follows, for example.

[0042] The content of isostearic acid according to the present invention, relative to the total amount of the composition of the present invention, may be, for example, 0.1% by mass or more, 0.5% by mass or more, or 1.0% by mass or more, and may also be 5.0% by mass or less, 3.0% by mass or less, or 1.0% by mass or less.

[0043] Furthermore, the content of isostearic acid per 100 parts by mass of pigment particles according to the present invention may be, for example, 1.0 part by mass or more, 2.0 parts by mass or more, 3.0 parts by mass or more, 4.0 parts by mass or more, 5.0 parts by mass or more, or 6.0 parts by mass or more, or 20 parts by mass or less, 15 parts by mass or less, 10 parts by mass or less, 9.0 parts by mass or less, 8.0 parts by mass or less, or 7.0 parts by mass or less.

[0044] In this invention, isostearic acid can be obtained directly from a commercially available product.

[0045] (Liquid oil) In this invention, "liquid oil" refers to an oil that is fluid at atmospheric pressure (1 atm) and room temperature (25°C) and conforms to the shape of the container. "Liquid oil" refers to oils other than the "isostearic acid" mentioned above.

[0046] In the composition of the present invention, 50% by mass or more of the liquid oil content is volatile silicone oil. This configuration can further improve the usability (especially the freshness) of the composition of the present invention.

[0047] In this invention, "volatile" refers to a substance whose volatile content exceeds 5% when left at atmospheric pressure and 105°C for 3 hours. In this disclosure, "non-volatile" refers to a substance whose volatile content is 5% or less when left at 105°C for 3 hours. Here, volatile content refers to the value of the weight change rate measured by gravimetric method after placing filter paper on a glass petri dish and dropping approximately 0.2g of the sample onto it.

[0048] In the present invention, examples of volatile silicone oils include volatile acyclic silicone oils (e.g., volatile linear silicone oils, volatile branched silicone oils, etc.) and volatile cyclic silicone oils.

[0049] Examples of volatile linear silicone oils include, but are not limited to, dimethicone (also called "dimethylpolysiloxane") with viscosities of 5.0 cSt or less, 4.0 cSt or less, 3.0 cSt or less, or 2.0 cSt or less. The lower limit of the viscosity of dimethicone is not particularly limited and may be, for example, 0.5 cSt or more, 0.6 cSt or more, or 1.0 cSt or more. Here, these viscosities are intended to be kinematic viscosities under a 25°C atmosphere.

[0050] Examples of volatile branched silicone oils include low molecular weight branched siloxanes such as methyl trimethicone, tris(trimethylsilyl)methylsilane, and tetrakis(trimethylsilyl)silane.

[0051] Examples of volatile cyclic silicone oils include octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane.

[0052] In the composition of the present invention, the content of volatile silicone oil may be 50% by mass or more of the liquid oil content, specifically, for example, 50% by mass or more, 52% by mass or more, 55% by mass or more, 58% by mass or more, or 60% by mass or more of the liquid oil content, or 100% by mass or less, 95% by mass or less, 90% by mass or less, 85% by mass or less, 80% by mass or less, 75% by mass or less, or 70% by mass or less.

[0053] In the composition of the present invention, the liquid oil component may further contain other oil components in addition to the volatile silicone oil.

[0054] The liquid oil component according to the present invention is not particularly limited and may further include, for example, at least one oil component selected from the group consisting of polar oils and hydrocarbon oils.

[0055] In this invention, polar oil refers to oils that have high polarity among oils commonly used in cosmetics, for example, oils with a relative permittivity of about 5 or more, preferably about 10 or more.

[0056] Specifically, the polar oil may contain at least one of an ultraviolet absorber (particularly an oily ultraviolet absorber) and an ester oil. From the viewpoint of imparting an ultraviolet protection effect to the composition of the present invention, it is preferable that the polar oil contains an ultraviolet absorber, particularly an oily ultraviolet absorber.

[0057] In the present invention, examples of ultraviolet absorbers include, but are not limited to, benzoic acid derivatives, salicylic acid derivatives, cinnamic acid derivatives, dibenzoylmethane derivatives, β,β-diphenylacrylate derivatives, benzophenone derivatives, benzylidene camphor derivatives, triazine derivatives, phenylbenzotriazole derivatives, anthranyl derivatives, imidazoline derivatives, benzalmalonate derivatives, and 4,4-diarylbutadiene derivatives. Furthermore, some specific examples and trade names of these are described below.

[0058] Examples of benzoic acid derivatives include, but are not limited to, ethyl para-aminobenzoate (PABA), ethyl-dihydroxypropyl PABA, ethylhexyl-dimethyl PABA (e.g., "Escalol 507"; manufactured by ISP), glyceryl PABA, PEG-25-PABA (e.g., "Ubinal P25"; manufactured by BASF), alkyl benzoate (C12-15), and diethylaminohydroxybenzoyl hexyl benzoate (e.g., "Ubinal A Plus").

[0059] Examples of salicylic acid derivatives include, but are not limited to, homosalate ("Eusolex HMS"; manufactured by Rona / EM Industries), ethylhexyl salicylate (e.g., "NeoHeliopan OS"; manufactured by Herman & Raymer), dipropylene glycol salicylate (e.g., "Dipsal"; manufactured by Skell), and TEA salicylate (e.g., "NeoHeliopan TS"; manufactured by Herman & Raymer).

[0060] Examples of cinnamic acid derivatives include, but are not limited to, ethylhexyl methoxycinnamate (e.g., "Parsol MCX"; manufactured by Hoffmann-La Roche), isopropyl methoxycinnamate, isoamyl methoxycinnamate (e.g., "Neo-Heliopan E1000"; manufactured by Herman & Raymer), cinnoxate, DEA methoxycinnamate, diisopropyl methylcinnamate, glyceryl-ethylhexanoate-dimethoxycinnamate, and di-(2-ethylhexyl)-4'-methoxybenzalmalonate.

[0061] Examples of dibenzoylmethane derivatives include, but are not limited to, 4-tert-butyl-4'-methoxydibenzoylmethane (e.g., "Parsol 1789").

[0062] Examples of β,β-diphenyl acrylate derivatives include, but are not limited to, octocrylene (e.g., "Ubinal N539"; manufactured by BASF).

[0063] Examples of benzophenone derivatives include, but are not limited to, benzophenone-1 (e.g., "Ubinal 400"; manufactured by BASF), benzophenone-2 (e.g., "Ubinal D50"; manufactured by BASF), benzophenone-3 or oxybenzone (e.g., "Ubinal M40"; manufactured by BASF), benzophenone-4 (e.g., "Ubinal MS40"; manufactured by BASF), benzophenone-5, benzophenone-6 (e.g., "Helisorb 11"; manufactured by Norquay), benzophenone-8 (e.g., "Spectra-Sorb UV-24"; manufactured by American Cyanamide Corporation), benzophenone-9 (e.g., "Ubinal DS-49"; manufactured by BASF), and benzophenone-12.

[0064] Examples of benzylidene camphor derivatives include, but are not limited to, 3-benzylidene camphor (e.g., "Mexoryl SD"; manufactured by CIMEX), 4-methylbenzylidene camphor, benzylidene camphor sulfonic acid (e.g., "Mexoryl SL"; manufactured by CIMEX), benzalkonium camphor methosulfate (e.g., "Mexoryl SO"; manufactured by CIMEX), terephthalylidene disodium camphor sulfonic acid (e.g., "Mexoryl SX"; manufactured by CIMEX), and polyacrylamide methylbenzylidene camphor (e.g., "Mexoryl SW"; manufactured by CIMEX).

[0065] Examples of triazine derivatives include, but are not limited to, anisotriazine (e.g., "Tinosorb S"; manufactured by Ciba Specialty Chemicals), ethylhexyltriazone (e.g., "Uvasorb T150"; manufactured by BASF), diethylhexylbutamidetriazone (e.g., "Uvasorb HEB"; manufactured by Sigma 3V), bisethylhexyloxyphenol methoxyphenyl triazine, and 2,4,6-tris(diisobutyl-4'-aminobenzalmalonate)-s-triazine.

[0066] Examples of phenylbenzotriazole derivatives include, but are not limited to, drometrizole trisiloxane (e.g., "Silatrizole"; manufactured by Rhodia Simiy Corporation) and methylenebis(benzotriazolyltetramethylbutylphenol) (e.g., "Tinosorb M" (manufactured by Ciba Specialty Chemicals)).

[0067] Examples of anthranil derivatives include, but are not limited to, menthyl anthranilate (e.g., "Neo-Heliopan MA"; manufactured by Herman & Raymer).

[0068] Examples of imidazoline derivatives include, but are not limited to, ethylhexyl dimethoxybenzylidene dioxoimidazoline propionate.

[0069] Examples of benzalmalonate derivatives include, but are not limited to, polyorganosiloxanes having a benzalmalonate functional group (e.g., polysilicone-15; "Parsol SLX"; manufactured by DSM Nutrition Japan).

[0070] Examples of 4,4-diarylbutadiene derivatives include, but are not limited to, 1,1-dicarboxy(2,2'-dimethylpropyl)-4,4-diphenylbutadiene.

[0071] Of the above-mentioned ultraviolet absorbers, some are solid under normal pressure (1 atm) and room temperature (25°C). However, solid ultraviolet absorbers are not classified as "liquid oil" according to the present invention and may simply be included in the "oil phase components."

[0072] More specifically, as ester oils, for example, pentaerythrityl tetraethylhexanoate, tripropylene glycol dieopentanoate, isononyl isononanoate, cetyl octanoate, hexyldecyl decyldimethyloctanoate oleate, cetyl lactate, myristyl lactate, cetyl ethylhexanoate, ethylene glycol di-2-ethylhexanoate, diisostearyl malate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, triethylhexanoin, glyceryl trioctanoate, triisopalmitate Examples include, but are not limited to, glycerin mitate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, castor oil fatty acid methyl ester, acetoglyceride, diisobutyl adipate, di-2-heptyl undecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, and triethyl citrate.

[0073] In the composition of the present invention, the content of polar oil, if present, is not particularly limited. For example, it may be 1.0% by mass or more, 2.0% by mass or more, 3.0% by mass or more, 4.0% by mass or more, or 5.0% by mass or more, relative to the total amount of the composition of the present invention, or it may be 15% by mass or less, or 10% by mass or less.

[0074] In the present invention, hydrocarbon oil refers to hydrocarbon oils other than the polar oils described above.

[0075] In the present invention, the hydrocarbon oil may be a volatile hydrocarbon oil or a non-volatile hydrocarbon oil.

[0076] Specific examples of hydrocarbon oils include, but are not limited to, decane, dodecane, isododecane, isohexadecane, liquid paraffin, squalane, squalene, paraffin, and mixtures of two or more of these.

[0077] In the composition of the present invention, the content of hydrocarbon oil, if present, is not particularly limited. For example, it may be 1.0% by mass or more, 2.0% by mass or more, 3.0% by mass or more, 4.0% by mass or more, or 5.0% by mass or more, relative to the total amount of the composition of the present invention, or it may be 15% by mass or less, or 10% by mass or less.

[0078] (Other oil phase components) In the composition of the present invention, the oil phase component may further contain other oil phase components as desired, in addition to the components described above, as long as they do not impair the effects of the present invention.

[0079] Other oil phase components are not particularly limited and include, for example, particles other than hydrophobized pigment particles (e.g., ultraviolet scattering agent particles, usable powders, etc.), solid ester oils, higher fatty acids (other than isostearic acid), higher alcohols, oils and fats, and waxes.

[0080] <Aqueous phase components> The composition of the present invention contains an aqueous phase component. The aqueous phase component constitutes the outer phase of the composition of the present invention.

[0081] (water) In the composition of the present invention, the aqueous phase component may include water.

[0082] While there are no particular restrictions on the type of water used, water used in cosmetics, quasi-drugs, etc., can be used. For example, ion-exchanged water, distilled water, ultrapure water, tap water, etc., can be used.

[0083] In the composition of the present invention, the water content is not particularly limited and can be 30% by mass or more, 40% by mass or more, 50% by mass or more, 60% by mass or more, 70% by mass or more, or 80% by mass or more, relative to the total amount of the composition of the present invention, or it can be 90% by mass or less, 80% by mass or less, 70% by mass or less, or 60% by mass or less.

[0084] (Water-soluble active ingredients) In the composition of the present invention, the aqueous phase component preferably contains a water-soluble active ingredient. In the present invention, "water-soluble active ingredient" refers to an ingredient that is water-soluble and exerts its function by penetrating the skin. Here, the function of the water-soluble active ingredient is not particularly limited and means the ability to bring about some effect on the skin, especially a beneficial effect (for example, moisturizing effect, firming effect, whitening effect, anti-wrinkle effect, or anti-spot effect).

[0085] In the present invention, the water-soluble active ingredient is not particularly limited and may include, for example, at least one selected from the group consisting of alkoxysalicylic acid or its salt, 1-piperidinepropionic acid or its salt, neutral amino acids or their peptides, vitamin A group or its derivatives, vitamin B group or its derivatives, plant extracts, tranexamic acid or its derivatives, and fermentation extracts.

[0086] Alkoxysalicylic acid may be, for example, a salicylic acid-based compound in which any hydrogen atom at position 3, 4, or 5 of salicylic acid is substituted with an alkoxy group (-OR), as represented by the following general formula (A). [ka] In the formula, R represents an alkyl group.

[0087] More specifically, in general formula (A), the alkyl group R constituting the alkoxy group (-OR) is not particularly limited. Specifically, for example, methyl group (corresponding alkoxy group-OR: methoxy group), ethyl group (corresponding ethoxy group), propyl group (corresponding propoxy group), isopropyl group (corresponding isopropoxy group), butyl group (corresponding butoxy group), and isobutyl group (corresponding isobutoxy group) are preferred, and methyl group (corresponding methoxy group) or ethyl group (corresponding ethoxy group) are more preferred, but are not limited to these.

[0088] In the present invention, the salt of alkoxysalicylic acid is not particularly limited, and is preferably a pharmaceutically acceptable salt, such as alkali metal salts or alkaline earth metal salts like sodium salt, potassium salt, or calcium salt, as well as salts such as ammonium salt and amino acid salt.

[0089] 1-Piperidinepropionic acid may be a compound represented by the following general formula (B): [ka]

[0090] The salt of 1-piperidinepropionic acid is not particularly limited and may be, for example, an inorganic salt or an organic salt. Examples of inorganic salts include hydrochloride, sulfate, phosphate, hydrobromide, sodium salt, potassium salt, magnesium salt, calcium salt, and ammonium salt. Examples of organic salts include acetate, lactate, maleate, fumarate, tartrate, citrate, methanesulfonate, p-toluenesulfonate, triethanolamine salt, diethanolamine salt, and amino acid salt.

[0091] The neutral amino acid may be naturally occurring or synthetic. More specifically, it may be at least one selected from the group consisting of alanine, glycine, proline, valine, leucine, isoleucine, methionine, phenylalanine, tryptophan, cysteine, tyrosine, threonine, serine, asparagine, and glutamine.

[0092] A neutral amino acid peptide refers to a molecule formed by the bonding of two or more neutral amino acids. These two or more neutral amino acids may be the same or different. More specifically, a neutral amino acid peptide may be, for example, glycylglycine, but is not limited to this.

[0093] Vitamin A group is a collective term for retinol, retinal, and retinoic acid.

[0094] The derivatives of vitamin A are not particularly limited and may be, for example, vitamin A esters. Examples of vitamin A esters include, but are not limited to, vitamin A acetate, vitamin A palmitate, and vitamin A propionate.

[0095] The B vitamin group or its derivatives includes, for example, one or more compounds selected from the group consisting of vitamin B1, vitamin B2, vitamin B3 (also called "niacin"), vitamin B5, vitamin B6, or vitamin B12, or derivatives thereof, and particularly preferably includes vitamin B3, also called "niacin," or its derivatives. Note that "niacin" includes nicotinic acid and niacinamide (also called "nicotinamide").

[0096] Tranexamic acid is also known as trans-4-aminomethylcyclohexane-1-carboxylic acid.

[0097] Examples of tranexamic acid derivatives include, but are not limited to, tranexamic acid salts (metal salts such as magnesium salts, calcium salts, sodium salts, potassium salts, phosphates, hydrochlorides, hydrobromides, sulfates, etc.), tranexamic acid amides (methylamide or its salts, etc.), and tranexamic acid dimers.

[0098] Hyaluronic acid, for example, can be obtained from plant extracts. Therefore, water-soluble active ingredients can include hyaluronic acid and its salts. Hyaluronic acid may also be obtained from microbial fermentation or chemical synthesis.

[0099] From the fermentation extract, for example, a Lactobacillus / rice ferment can be obtained. Therefore, the water-soluble active ingredient can include a rice ferment (e.g., Lactobacillus).

[0100] In the composition of the present invention, the content of a water-soluble active ingredient is not particularly limited. For example, it may be 0.1% by mass or more, 0.5% by mass or more, 1.0% by mass or more, 2.0% by mass or more, 3.0% by mass or more, 4.0% by mass or more, 5.0% by mass or more, or 6.0% by mass or more, relative to the total amount of the composition of the present invention. It may also be 20% by mass or less, 15% by mass or less, 10% by mass or less, or 8.0% by mass or less.

[0101] (Other aqueous phase components) In the composition of the present invention, in addition to the components described above, other aqueous phase components may be optionally included, as long as they do not impair the effects of the present invention. The following describes, illustrative examples of other aqueous phase components included in the composition of the present invention, but the present invention is not limited to these components.

[0102] The composition of the present invention preferably further comprises a nonionic surfactant. The nonionic surfactant is present in the aqueous phase component, but because it has the function of emulsifying oil droplets, it can mainly be present at the interface between the oil droplet and the aqueous phase component.

[0103] The nonionic surfactant is not particularly limited, and for example, nonionic surfactants with HLB values ​​of 8.0 or higher, 10.0 or higher, 12.0 or higher, or 14.0 or higher, or 16.0 or lower, 15.5 or lower, or 15.0 or lower can be used. Here, HLB is a value that generally indicates the affinity of a surfactant for water and oil, and is a parameter known as the hydrophilic-lipophilic balance, which can be easily determined by known calculation methods such as the Griffin method.

[0104] The nonionic surfactant is not particularly limited and can include, for example, polyoxyalkylene alkyl ethers, polyalkylene glycol fatty acid esters, POE hydrogenated castor oil derivatives, POE alkyl ethers, POE·POP alkyl ethers, PEG fatty acid esters, polyglycerin fatty acid esters, POE glycerin fatty acid esters, PEG glyceryl isostearate, and silicone-based surfactants. In addition, nonionic surfactants such as polyglyceryl-2 diisostearate and sorbitan sesquiisostearate can also be used. Nonionic surfactants can be used alone or in combination of two or more.

[0105] Examples of polyoxyalkylene alkyl ethers include polyoxyethylene behenyl ether and polyoxyethylene stearyl ether.

[0106] Examples of polyalkylene glycol fatty acid esters include polyethylene glycol monostearate and polyethylene glycol monooleate.

[0107] Examples of POE hydrogenated castor oil derivatives (PEG hydrogenated castor oil) include POE(20-100) hydrogenated castor oil derivatives. Specifically, these include, but are not limited to, POE(20) hydrogenated castor oil derivatives (i.e., PEG-20 hydrogenated castor oil), POE(40) hydrogenated castor oil derivatives (i.e., PEG-40 hydrogenated castor oil), POE(60) hydrogenated castor oil derivatives (i.e., PEG-60 hydrogenated castor oil), and POE(100) hydrogenated castor oil derivatives (i.e., PEG-100 hydrogenated castor oil).

[0108] Examples of POE alkyl ethers include POE(2) lauryl ether, POE(4.2) lauryl ether, POE(9) lauryl ether, POE(5.5) cetyl ether, POE(7) cetyl ether, POE(10) cetyl ether, POE(15) cetyl ether, POE(20) cetyl ether, POE(23) cetyl ether, POE(4) stearyl ether, POE(20) stearyl ether, POE(7) oleyl ether, POE(10) oleyl ether, and POE(15) oleyl ether. Examples include, but are not limited to, tel, POE(20) oleyl ether, POE(50) oleyl ether, POE(10) behenyl ether, POE(20) behenyl ether, POE(30) behenyl ether, POE(2)(C12-15) alkyl ether, POE(4)(C12-15) alkyl ether, POE(10)(C12-15) alkyl ether, POE(5) secondary alkyl ether, POE(7) secondary alkyl ether, POE(9) alkyl ether, POE(12) alkyl ether, etc.

[0109] Examples of POE·POP alkyl ethers include, but are not limited to, POE(1) polyoxypropylene (POP)(4) cetyl ether, POE(10) POP(4) cetyl ether, POE(20) POP(8) cetyl ether, POE(20) POP(6) decyltetradecyl ether, and POE(30) POP(6) decyltetradecyl ether.

[0110] Examples of PEG fatty acid esters include, but are not limited to, polyethylene glycol monolaurate (hereinafter abbreviated as PEG) (10), PEG monostearate (10), PEG monostearate (25), PEG monostearate (40), PEG monostearate (45), PEG monostearate (55), PEG monostearate (100), PEG monooleate (10), PEG distearate, and PEG diisostearate.

[0111] Examples of polyglycerin fatty acid esters include, but are not limited to, hexaglyceryl monolaurate, hexaglyceryl monomyristate, hexaglyceryl monostearate, hexaglyceryl monooleate, decaglyceryl monolaurate, decaglyceryl monomyristate, decaglyceryl monostearate, decaglyceryl monoisostearate, decaglyceryl monooleate, decaglyceryl distearate, and decaglyceryl diisostearate.

[0112] Examples of POE glycerin fatty acid esters include, but are not limited to, polyoxyethylene (POE)(5) glyceryl monostearate, POE(15) glyceryl monostearate, POE(5) glyceryl monooleate, and POE(15) glyceryl monooleate.

[0113] Examples of PEG-Glyceryl Isostearate include, but are not limited to, PEG-8 glyceryl isostearate, PEG-10 glyceryl isostearate, PEG-15 glyceryl isostearate, PEG-20 glyceryl isostearate, PEG-25 glyceryl isostearate, PEG-30 glyceryl isostearate, PEG-40 glyceryl isostearate, PEG-50 glyceryl isostearate, and PEG-60 glyceryl isostearate.

[0114] Examples of silicone-based surfactants include, but are not limited to, polyether-modified silicones, such as PEG(3) dimethicone, PEG(7) dimethicone, PEG(9) dimethicone, PEG(10) dimethicone, PEG(12) dimethicone, PEG(9) methyl ether dimethicone, PEG(10) methyl ether dimethicone, PEG(11) methyl ether dimethicone, PEG(32) methyl ether dimethicone, and PEG(9) polydimethylsiloxyethyl dimethicone.

[0115] In the composition of the present invention, the content of a nonionic surfactant, if present, is not particularly limited. For example, it may be 0.5% by mass or more, 1.0% by mass or more, 1.5% by mass or more, 2.0% by mass or more, or 2.5% by mass or more, relative to the total amount of the composition of the present invention, or it may be 20% by mass or less, 15% by mass or less, 10% by mass or less, or 5.0% by mass or less.

[0116] The composition of the present invention may further contain a humectant.

[0117] The humectant is not particularly limited and may be a polyhydric alcohol, polyol, or alkylene oxide derivative, for example. More specifically, examples of polyhydric alcohols and polyols include, but are not limited to, glycerin, 1,3-butylene glycol, and dipropylene glycol.

[0118] In the composition of the present invention, the amount of a humectant, if present, is not particularly limited. For example, it may be 0.5% by mass or more, 1.0% by mass or more, or 5.0% by mass or more, relative to the total amount of the composition of the present invention, or it may be 20% by mass or less, 15% by mass or less, or 10% by mass or less.

[0119] The composition of the present invention may further contain a thickening agent, particularly a hydrophilic thickening agent. A hydrophilic thickening agent refers to a thickening agent that has hydrophilic groups and can increase the viscosity of a water-containing liquid.

[0120] The hydrophilic thickener is not particularly limited and includes, but is not limited to, acrylic thickeners and polysaccharide thickeners.

[0121] Acrylic thickeners refer to hydrophilic thickeners with acrylic acid as the main chain. Acrylic polymers and vinyl polymers are particularly preferred as acrylic thickeners. More specifically, acrylic thickeners include, but are not limited to, (acrylates / alkyl(C10-30) acrylate) crosspolymers, (ammonium acryloyldimethyltaurate / beheneth-25 methacrylate) crosspolymers, (sodium acrylate / sodium acryloyldimethyltaurate) copolymers, (dimethylacrylamide / sodium acryloyldimethyltaurate) crosspolymers, and carbomers.

[0122] Examples of polysaccharide thickeners include, but are not limited to, naturally derived polysaccharide thickeners, microbially derived polysaccharide thickeners, nonionic cellulose derivatives, anionic cellulose, cationized cellulose, and cationized guar gum. Examples of naturally derived polysaccharide thickeners include, but are not limited to, alginic acid, carrageenan, agar, fercelan, guar gum, quince seed, konjac mannan, tamarind seed gum, tara gum, dextrin, starch, locust bean gum, gum arabic, gatti gum, karaya gum, tragacanth gum, arabinogalactan, pectin, quince, chitosan, and hyaluronic acid. Examples of microbially derived polysaccharide thickeners include, but are not limited to, curdlan, xanthan gum, gellan gum, cyclodextrin, dextran, pullulan, chitosan, and hyaluronic acid. Examples of nonionic cellulose derivatives include, but are not limited to, microcrystalline cellulose, methylcellulose, ethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, and hydroxypropylmethylcellulose. Examples of anionic cellulose include, but are not limited to, carboxymethylcellulose. Examples of cationized cellulose include, but are not limited to, O-[2-hydroxy-3-(trimethylammonio)propyl]hydroxyethylcellulose chloride.

[0123] In the composition of the present invention, the amount of a thickening agent, if present, is not particularly limited. For example, it may be 0.05% by mass or more, 0.1% by mass or more, or 0.5% by mass or more, or 5.0% by mass or less, or 1.0% by mass or less, based on the total amount of the composition of the present invention.

[0124] The composition of the present invention may further contain dispersants other than isostearic acid.

[0125] Other dispersants besides isostearic acid are not particularly limited and may include, for example, the nonionic surfactants mentioned above, among which those having the function of dispersing particles are particularly preferred. Silicone polymers, such as amodimethicone, may also be used.

[0126] More specifically, the dispersant other than isostearic acid may include, for example, at least one selected from the group consisting of polyglyceryl-6 polyricinoleate, polyglyceryl-3 bisbutyldimethicone, and amodimethicone.

[0127] Furthermore, amodimethicone dispersants are also called aminoethylaminopropylmethylsiloxane / dimethylsiloxane copolymer dispersants, and for example, compounds represented by the following formula (1) are preferably used: [ka]

[0128] Here, the functional group equivalent of the compound in formula (1) may be 1000 or more, 1500 or more, or 2000 or more, and may also be 3000 or less, 2500 or less, 2000 or less, or 1800 or less. Note that "functional group equivalent" refers to the value obtained by dividing the molecular weight of the compound in formula (1) by the number of amino groups contained in the molecule.

[0129] Furthermore, in formula (1), X is an alkyl group having 1 to 18 carbon atoms, R and R' are alkyl groups having 1 to 6 carbon atoms, m is 20 to 2000, and n is 1 to 100.

[0130] In the composition of the present invention, if a dispersant other than isostearic acid is included, its content is not particularly limited. For example, it may be 0.5% by mass or more, 1.0% by mass or more, 1.5% by mass or more, 2.0% by mass or more, or 2.5% by mass or more, relative to the total amount of the composition, or it may be 15% by mass or less, 10% by mass or less, 5.0% by mass or less, or 1.0% by mass or less.

[0131] In addition to the above, the compositions of the present invention can further include, for example, anionic surfactants, cationic surfactants, amphoteric surfactants, water-soluble polymers, oil-soluble polymers, film-forming agents such as silicone polysaccharides, metal ion sequestering agents, lower alcohols such as ethanol, higher alcohols such as stearyl alcohol, various extracts, sugars, amino acids, organic amines, polymer emulsions, chelating agents, other UV absorbers other than the UV absorbers mentioned above, pH adjusters, neutralizing agents, skin nutrients, vitamins, water-soluble agents applicable to pharmaceuticals, quasi-drugs, cosmetics, etc., buffering agents, anti-fading agents, preservatives, dispersants, propellants, organic powders, dyes, pigments, fragrances, etc. These components can be appropriately blended as oil-phase components or aqueous-phase components depending on their respective properties.

[0132] <Manufacturing method> The method for producing the composition of the present invention is not particularly limited, and can be prepared by methods such as dispersion.

[0133] Dispersion methods are methods of breaking down clumps of a dispersed phase into fine particles using mechanical force. Specifically, they involve emulsifying using the crushing force of an emulsifier. Examples of such methods include high-pressure emulsification, which applies high shear force using a high-pressure homogenizer.

[0134] <Dosage Form> The dosage form of the composition of the present invention is not particularly limited and may be liquid, emulsion, cream, gel, spray, mousse, etc. Here, "spray" can include mist-type sprays, aerosol-type sprays, etc.

[0135] <Application> The composition of the present invention exhibits good emulsification stability, particularly at high temperatures, and also provides a refreshing feel. Therefore, the composition of the present invention can be suitably used as a cosmetic (especially a makeup cosmetic) or as a raw material therefor.

[0136] Therefore, the present invention can also provide a makeup cosmetic comprising the composition of the present invention.

[0137] Makeup cosmetics are not particularly limited and include, but are not limited to, foundation, BB cream, CC cream, blush (especially cream blush), concealer, eyeshadow (especially cream eyeshadow), lipstick, etc. [Examples]

[0138] The present invention will be further explained with reference to the following examples, but the present invention is not limited to these examples. Unless otherwise specified, the amounts of the ingredients are expressed in mass percent.

[0139] Examples 1-6 Based on the formulations in Table 1, oil-in-water emulsion compositions of Examples 1 to 6 were prepared.

[0140] Emulsification and high-temperature-dependent emulsification stability were evaluated for each prepared composition. The evaluation results are shown in Table 1.

[0141] <Evaluation of emulsification> Emulsification was evaluated for each composition. More specifically, a small amount of each composition sample was mixed with water, and the appearance of whether or not the pigment particles in the composition aggregated was observed and evaluated according to the following criteria. "A": There were no abnormalities in appearance (i.e., emulsification was achieved); "B": There was an abnormality in the appearance (such as aggregation) (i.e., it could not be emulsified).

[0142] <Evaluation of emulsification stability over time at high temperatures> Each composition was stored at 50°C for 4 weeks. After storage, a small sample of each composition was mixed with water, and the appearance was observed to see if the pigment particles in the composition had aggregated. This was evaluated according to the following criteria: "A": Those with a familiar appearance (i.e., those with stable emulsification); "B": Some aggregation was observed; "C": Indicates cases where significant aggregation was observed.

[0143] [Table 1]

[0144] As is clear from the results in Table 1, the compositions of Examples 1 to 6 all successfully incorporated pigment particles surface-treated with a metal soap-based surface treatment agent into the emulsion particles, and also exhibited excellent high-temperature stability over time.

[0145] Although usability evaluations were not conducted, all compositions are oil-in-water emulsion cosmetic compositions and are therefore expected to have a refreshing feel.

[0146] Comparative Examples 1-8 Based on the formulations in Tables 2-1 and 2-2, oil-in-water emulsion compositions of Comparative Examples 1 to 8 were prepared. For each prepared composition, the emulsification stability and high-temperature emulsification stability were evaluated in the same manner as described above. The evaluation results are shown in Tables 2-1 and 2-2.

[0147] [Table 2-1]

[0148] [Table 2-2]

[0149] As is clear from the results in Tables 2-1 and 2-2, all of the compositions in Comparative Examples 1 to 8 were found to have poor emulsification stability over high temperatures. Furthermore, all of the compositions in Comparative Examples 5 to 8 were found to have poor emulsification stability.

[0150] 《Reference examples 1~3》 Based on the formulations in Table 3, water-in-oil emulsion cosmetic compositions for Reference Examples 1-3 were prepared. For each prepared composition, the emulsification stability and high-temperature emulsification stability were evaluated in the same manner as described above. The evaluation results are shown in Table 3.

[0151] [Table 3]

[0152] As is clear from the results in Table 3, all of the compositions in Reference Examples 1 to 3 were found to stably incorporate pigment particles surface-treated with a metal soap-based surface treatment agent into the emulsion particles, and also exhibited excellent high-temperature stability over time.

[0153] These results suggest that, in the case of water-in-oil emulsion cosmetic compositions, since pigment particles treated with a metal soap-based surface treatment agent are present in the oil phase (outer phase), problems related to emulsification stability and high-temperature stability do not occur.

Claims

1. An oil-in-water emulsion cosmetic composition comprising an oil phase component and an aqueous phase component, The oil phase component comprises pigment particles whose surface is treated with a metal soap, isostearic acid, and liquid oil. The pigment particles are dispersed in the liquid oil, and At least 50% by mass of the aforementioned liquid oil is volatile silicone oil. composition.

2. The composition according to claim 1, wherein the metal soap comprises at least one selected from the group consisting of magnesium stearate, calcium stearate, zinc myristate, and aluminum dimyristate.

3. The composition according to claim 1, wherein the amount of pigment particles is 1.0 to 150 parts by mass per 100 parts by mass of liquid oil.

4. The composition according to claim 1, further comprising a nonionic surfactant.

5. The composition according to claim 1, wherein the aqueous phase component comprises a water-soluble active ingredient.

6. The composition according to claim 5, wherein the water-soluble active ingredient comprises at least one selected from the group consisting of alkoxysalicylic acid or a salt thereof, 1-piperidinepropionic acid or a salt thereof, a neutral amino acid or a peptide thereof, a vitamin A group or a derivative thereof, a vitamin B group or a derivative thereof, a plant extract, tranexamic acid or a derivative thereof, and a fermentation extract.

7. A makeup cosmetic comprising the composition described in any one of claims 1 to 6.

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