Oil-in-water emulsion cosmetic for mist spray

Abstract

The object of the present invention is to provide an oil-in-water emulsion cosmetic for mist spray that has excellent SPF boosting effect, good stability, and a fresh, non-sticky feel. [Solution] The present invention relates to an oil-in-water emulsion cosmetic composition for mist spray, comprising an aqueous clay mineral together with an ultraviolet absorber, wherein the aqueous clay mineral content is 1.0% to 5%, and which does not contain a water-soluble polymer or an ultraviolet scattering agent.

Description

Technical Field

[0001] The present invention relates to an oil-in-water type emulsified cosmetic. More specifically, it is an oil-in-water type emulsified cosmetic suitable for use as a mist spray.

Background Art

[0002] Ultraviolet absorbers and ultraviolet scattering agents contained in cosmetics mainly have the function of reducing damage to the skin caused by ultraviolet rays and preventing sunburn and skin aging. It is known that the higher the blending amount, the better the ultraviolet protection effect.

[0003] On the other hand, cosmetics are used on the skin and are premised on being a formulation. Even when an ultraviolet protection effect is required, good safety and usability when applied to the skin are required. To improve the ultraviolet protection effect, if a large amount of ultraviolet absorber or ultraviolet scattering agent is blended, separation may occur and the formulation may not be formed (unstable). Also, even when it is stable, it may cause skin inflammation or allergic reactions due to the irritation of the ultraviolet absorber or ultraviolet scattering agent itself. Furthermore, there are problems such as stickiness and a crunching feeling during application, which deteriorates the usability.

[0004] As a technology to solve the above problems, Patent Document 1 discloses a water-resistant O / W type emulsified composition suitable for maintaining an ultraviolet protection effect. Also, Patent Document 2 discloses an oil-in-water type emulsified cosmetic in which the content of an oil-soluble ultraviolet absorber is suppressed while using an agar microgel and a clay mineral powder in combination to amplify the ultraviolet protection ability of the oil-soluble ultraviolet absorber in order to achieve both high ultraviolet protection ability and good usability. Furthermore, Patent Document 3 discloses a method for producing a fine particle dispersion having a high ultraviolet protection effect and good usability.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] Widely known dosage forms of oil-in-water emulsion cosmetics include creams, gels, and lotions, which are filled into jars or dispensers. In recent years, however, there has been increasing demand for spray formulations because they can be used without directly touching the product. Sprays are broadly classified into two types: aerosol sprays that use liquefied petroleum gas (LPG) such as propane or butane, and mist sprays that use pump-type or trigger-type spray containers. However, because aerosol sprays use LPG, there is a risk of fire during manufacturing in factories or during use or storage at home. Thus, caution is required when handling LPG, and during manufacturing, it is necessary to install safe ventilation systems and gas leak detection systems, as well as to regularly inspect these systems. Furthermore, because LPG is used, containers must be pressure-resistant and airtight, which has resulted in increased manufacturing costs.

[0007] The oil-in-water emulsion cosmetic composition of the present invention takes into account recent demand, is safe to manufacture and use, and has relatively low manufacturing costs, with a focus on use as a mist spray.

[0008] The technology described in Patent Document 1 above achieves a good user experience by making the outer phase an aqueous phase. However, simply making the outer phase an aqueous phase does not provide sufficient freshness, and the stickiness caused by the UV absorber has not been improved.

[0009] Furthermore, the technology described in Patent Document 2 above amplifies UV protection by using agar microgels and talc. However, because it uses agar microgels, which are water-soluble polymers, it is difficult to use as a mist spray. In other words, it was not an oil-in-water emulsion cosmetic suitable for the applications of the present invention.

[0010] Furthermore, the technology described in Patent Document 3 above uses a high-pressure emulsifier or an ultrasonic emulsifier to produce a fine particle dispersion. However, these machines require a large amount of electricity to generate fine particles. Therefore, not only are manufacturing costs high, but energy consumption increases, and there is a problem of a heavy burden on the environment. Specifically, the large amount of electricity consumed in the manufacturing process increases carbon dioxide emissions, raising concerns about the impact on the environment. [Means for solving the problem]

[0011] The inventors of this invention conducted diligent research to obtain an oil-in-water emulsion cosmetic suitable for use as a mist spray, assuming that it would not contain water-soluble polymers. As a result, they succeeded in obtaining an oil-in-water emulsion cosmetic that contains an aqueous clay mineral in a predetermined range along with an ultraviolet absorber, and does not contain an ultraviolet scattering agent, thereby providing excellent SPF boosting effect, good stability, and a refreshing feel. Furthermore, since this invention can be provided as a spray without using an aerosol, it is also excellent in terms of safety and cost performance.

[0012] Furthermore, the above-mentioned oil-in-water emulsion cosmetic can be manufactured very simply by adding an oil phase containing an ultraviolet absorber to an aqueous phase containing aqueous clay minerals. It can also be manufactured by reversing the oil and aqueous phases. In other words, the oil-in-water emulsion cosmetic of the present invention can be manufactured by normal-phase emulsification or phase-inversion emulsification. This means that it can be manufactured without using special emulsification methods such as high-pressure emulsification, ultrasonic emulsification, or Pickering emulsification, resulting in high manufacturing versatility. Moreover, because it does not use special emulsification methods, it can be manufactured relatively inexpensively and has no environmental impact.

[0013] Therefore, as one aspect of the present invention, cosmetic compositions of the following embodiments are provided. [1] An oil-in-water emulsion cosmetic, It contains the following ingredients (A) to (B): (A) UV absorber (B) Aqueous clay minerals The content of component (B) is 1.0% by mass to 5.0% by mass. The aforementioned oil-in-water emulsion cosmetic composition (C) Water-soluble polymers and (D) UV scattering agent Cosmetics used in mist sprays that substantially do not contain [specific ingredient]. [2] The cosmetic composition according to claim 1, wherein component (B) is at least one aqueous clay mineral selected from the group consisting of magnesium aluminum silicate and bentonite. [3] The cosmetic composition according to claim 1 or 2, wherein the content of component (A) is 0.1% by mass to 25% by mass. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide an oil-in-water emulsion cosmetic that has excellent SPF boosting effect, good stability and a refreshing feel, and is suitable for use in mist sprays because it does not contain water-soluble thickeners. [Modes for carrying out the invention]

[0015] Embodiments of the present invention will be described in detail below.

[0016] Unless otherwise defined herein, terms are used in the sense commonly used by those skilled in the art in the field of cosmetics and should not be construed as unduly restrictive.

[0017] "Content" is synonymous with concentration and addition amount (usage amount), and unless otherwise specifically defined in the specification, it means the proportion of the amount of a component relative to the total amount of the oil-in-water emulsified cosmetic. And the total amount of the content of each component does not exceed 100%. In this specification, unless otherwise specifically defined, the unit of content means "mass% (wt%)". Note that when using a commercially available product, the content of the component is preferably the amount of the component contained in the commercially available product, but it may also be the amount of the commercially available product itself. "And / or" means any one of the plurality of related items listed, or any combination of two or more, or all combinations. "Containing" means that elements other than the elements explicitly stated as being included can be added (synonymous with "at least containing"), but includes "consisting of" and "essentially consisting of". That is, "containing" can mean including the explicitly stated elements and any one or two or more elements, consisting of the explicitly stated elements, or essentially consisting of the explicitly stated elements. Elements include limitations such as components, processes, conditions, parameters, etc. The "~" of a numerical range is a range including the numerical values before and after it, and also includes a range excluding one of the included limit values. For example, "0 mass% ~ 100 mass%" can be any of 0 mass% or more, 100 mass% or less, and 0 mass% or more and 100 mass% or less. "Less than" for a numerical value represents a numerical value smaller than the described numerical value and does not include the described numerical value. For example, "less than 100 mass%" does not include 100 mass%, and means, for example, 99.99 mass% or less. The number of digits of an integer value coincides with the number of significant figures. For example, the significant figure of 1 is 1 digit, and the significant figure of 10 is 2 digits. Also, for a decimal value, the number of digits after the decimal point coincides with the number of significant figures. For example, the significant figure of 0.1 is 1 digit, and the significant figure of 0.10 means 2 digits.

[0018] The water-in-oil type emulsified cosmetic of this embodiment is a water-in-oil type emulsified cosmetic containing an aqueous clay mineral together with an ultraviolet absorber, does not contain a water-soluble thickener and an ultraviolet scattering agent, and is used as a mist spray. Thereby, a water-in-oil type emulsified cosmetic excellent in SPF boosting effect, having good stability and a fresh feeling of use can be provided.

[0019] [Component (A): Ultraviolet absorber] The ultraviolet absorber of component (A) is a component that alleviates the irritation to the skin caused by ultraviolet rays (UV). More specifically, the ultraviolet absorber is a component that absorbs light of wavelengths in the UV region, and is a component that can convert UV into light of another wavelength by UV absorption, temporarily change its own molecular structure, etc. UV means light in the region of wavelengths of 100 to 400 nm among the electromagnetic waves contained in sunlight. Generally, light with wavelengths of 320 to 400 nm is called UV-A, and light with wavelengths of 290 to 320 nm is called UV-B. The ultraviolet absorber contained in the water-in-oil type emulsified cosmetic can be an ultraviolet absorber for UV-A (UV-A absorber), an ultraviolet absorber for UV-B (UV-B absorber), or an ultraviolet absorber combining them. However, in order to absorb ultraviolet rays of a wide range of wavelengths, it is preferable to be an ultraviolet absorber combining a UV-A absorber and a UV-B absorber. Note that the ultraviolet absorber can be either oil-soluble or water-soluble without problems, but from the viewpoint of skin irritation, it is preferably blended in the internal phase (oil phase), and thus it is preferable to use an oil-soluble ultraviolet absorber.

[0020] Examples of UV-A absorbers include diethylamino hydroxybenzoyl hexyl benzoate, 2-hydroxy-4-methoxybenzophenone, bis-ethylhexyloxyphenol methoxyphenyl triazine, drometrizole trisiloxane, 2-(2-hydroxy-5-methylphenyl)benzotriazole, dimethoxybenzylidene dioxoimidazolidine propionate 2-ethylhexyl, bis(resulcinyl)triazine, methylenebisbenzotriazolyltetramethylbutylphenol, t-butyl methoxydibenzoylmethane, and terephthalylidene dicamphor sulfonic acid. These can be used individually or in combination of two or more. UV-A absorbers that exhibit high UV-A absorption even in small amounts are preferred, with diethylamino hydroxybenzoyl hexyl benzoate and bis-ethylhexyloxyphenol methoxyphenyl triazine being more preferred.

[0021] Examples of UV-B absorbers include ethylhexyl methoxycinnamate (2-ethylhexyl paramethoxycinnamate), bis-ethylhexyloxyphenol methoxyphenyl triazine, drometrizole trisiloxane, octocrylene, 2-ethylhexyl 2-cyano-3,3-diphenylacrylate, dimethicone diethyl benzalmalonate, 2,4,6-trianilino-p-(carbo-2'-ethylhexyl-1'-oxy)-1,3,5-triazine, 2-hydroxy-4-methoxybenzophenone, homomenthyl salicylate, and octyl salicylate. These can be used individually or in combination of two or more. UV-B absorbers that exhibit high UV-B absorption even in small amounts are preferred, with ethylhexyl methoxycinnamate being more preferred.

[0022] When using a combination of UV-A and UV-B absorbers as ultraviolet absorbers, it is preferable to combine diethylamino hydroxybenzoyl hexyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, and ethylhexyl methoxycinnamate, respectively, from the viewpoint of compatibility and providing a good ultraviolet protection effect.

[0023] The amount of UV absorber should be such that a UV absorption effect is observed. For example, in order for an oil-in-water emulsion cosmetic to exhibit a good UV protection effect, the amount is preferably 0.1% to 25% by mass, more preferably 1% to 20% by mass, even more preferably 5% to 15% by mass, and still more preferably 6% to 12% by mass. By setting the amount of UV absorber within the above range, it is easy to obtain an oil-in-water emulsion cosmetic that provides UV protection while being less sticky and less irritating to the skin.

[0024] By including ingredient (B) in addition to ingredient (A), the oil-in-water emulsion cosmetic becomes superior in its SPF boosting effect, exhibits good stability, and provides a fresh, non-greasy feel.

[0025] [Component (B): Water-soluble clay mineral] Component (B), the aqueous clay mineral, is a clay mineral that exists in a water-containing state and possesses a crystalline structure. Component (B) of the present invention can improve the emulsification properties during manufacturing of oil-in-water emulsion cosmetics. Furthermore, when used in combination with component (A), it suppresses stickiness derived from component (A) and contributes to a fresh, non-sticky feel. In addition, it functions to enhance the UV absorption effect of component (A) (SPF boost effect). These can be used individually or in combination of two or more.

[0026] Component (B) can be, for example, magnesium aluminum silicate, bentonite, saponite, montmorillonite, bydelite, nontronite, souconite, stivunsite, sepiolite, and palygorskite. In this invention, both natural aqueous clay minerals and synthetic aqueous clay minerals can be used, but synthetic aqueous clay minerals are preferred from the viewpoint of having a low impurity content. Synthetic aqueous clay minerals can be produced by conventional methods. These aqueous clay minerals may be unmodified or modified. In particular, it is preferable to use magnesium aluminum silicate, bentonite, saponite, montmorillonite, beiderite, nontronite, souconite, and stivunsite, which are classified as smectite clays, because they are readily available.

[0027] The amount of aqueous clay mineral should be such that it provides sufficient UV boosting effect, stability, and a good feel. For example, for an oil-in-water emulsion cosmetic to exhibit UV boosting effect, stability, and a good feel, the amount is preferably 1.0% to 5.0% by mass, more preferably 1.1% to less than 5.0% by mass, and even more preferably 1.2% to 2.0% by mass. If the amount of UV absorber is too low, good stability and SPF boosting effect cannot be obtained, and if it is too high, the SPF boosting effect will decrease.

[0028] [Component (C): Water-soluble polymer] Component (C) is a water-soluble polymer that dissolves in water and forms a hydrogel containing a large amount of water around its molecules. More specifically, it is characterized by having a number-average molecular weight of 10,000 or more. Component (C) contributes to the stability of the formulation, but when component (C) is included, the polymer clogs the spray container, hindering uniform spraying and making it difficult to use as a mist spray. Therefore, it is not suitable for use in the present invention.

[0029] Ingredient (C) includes, for example, microbially derived thickeners such as xanthan gum, hydroxypropyl xanthan gum, dextran, sclerotium gum, gellan gum, hyaluronic acid, sodium hyaluronate, acetylated hyaluronic acid, acetylated sodium hyaluronate, and sodium hyaluronate crosspolymer; seaweed-derived thickeners such as carrageenan, alginate, propylene glycol alginate, agar, agar microgel, and fucoidan; and methylcellulose, hydroxyethylcellulose, hydroxymethylcellulose, hydroxypropylcellulose, and hydroxypropylmethylcellulose. Examples of thickeners include cellulosic thickeners such as rose, carboxymethylcellulose, and carboxyethylcellulose; amino acid-based thickeners such as collagen; polyethylene glycol-based thickeners such as polyethylene glycol and polyethylene glycol distearate; urethane-based thickeners such as (PEG-240 / decyltetredeceth-20 / HDI) copolymer and polyurethane-59; starch-based thickeners such as hydroxypropyl starch phosphate and corn starch; and acrylic acid-based thickeners such as carboxyvinyl polymer and (acrylates / alkyl acrylate (C10-30)) crosspolymer.

[0030] [Ingredient (D): UV scattering agent] The ultraviolet scattering agent in component (D) is an ingredient that protects against ultraviolet rays by scattering or reflecting UV light. When component (D) is used in combination with component (B), a squeaky feeling occurs and a refreshing feeling cannot be obtained. Therefore, it is not suitable for use in the present invention.

[0031] Component (D) includes, for example, fine metal oxides such as zinc oxide, titanium oxide, and cerium oxide, which have a volume-average particle size on the nano-order (e.g., about 10 nm to 100 nm) and are spherical, rod-shaped, needle-shaped, spindle-shaped, plate-shaped, or irregularly shaped.

[0032] Here, "substantially free of (C) water-soluble thickeners and (D) UV scattering agents" means that the oil-in-water emulsion cosmetic of the present invention does not contain amounts of (C) water-soluble thickeners and (D) UV scattering agents that do not affect its usability, SPF boosting effect, or use as a spray, and does not necessarily mean that the content of (C) water-soluble thickeners and (D) UV scattering agents is strictly 0%. For example, if a trace amount of (C) water-soluble thickener is unintentionally included, or if a trace amount of (C) water-soluble thickener is intentionally included but does not perform the function of these components, the cosmetic product shall be considered to be substantially free of (C) water-soluble thickener. The same applies to (D) the ultraviolet scattering agent. Specifically, to avoid affecting the present invention, (C) the water-soluble thickener is considered to be substantially absent if it is less than 0.01% by mass, and (D) the ultraviolet scattering agent is considered to be substantially absent if it is less than 0.2% by mass.

[0033] [Other ingredients] An oil-in-water emulsion cosmetic composition according to one aspect of the present invention may contain other components in addition to components (A) and (B), as long as it can solve the problems of the present invention.

[0034] Other ingredients include, for example, ingredients commonly used in cosmetics. More specifically, these include bases, oils, hydrophilic emulsifiers, lipophilic emulsifiers, emulsifying aids, humectants, preservatives, pH adjusters, antioxidants, cooling agents, chelating agents, cosmetic ingredients, medicinal ingredients, fragrances, and coloring pigments. The content of these other ingredients can be appropriately determined by those skilled in the art, as long as it does not hinder the solving of the problem of the present invention. Some of these other ingredients are listed below, but these are merely examples and not limiting.

[0035] The base is typically water. Water is used as the base for the aqueous phase. The water can be any water commonly used to make cosmetics, such as purified water, aromatic distilled water, hot spring water, groundwater, or tap water. The water content can be any amount that can constitute an oil-in-water emulsion cosmetic, for example, preferably 40% to 90% by mass, more preferably 55% to 80% by mass, and even more preferably 60% to 70% by mass. The content of the aqueous phase containing water is preferably 70% to 95% by mass. By setting the base content within the above range, the moisturizing effect on the skin is enhanced.

[0036] Examples of oily agents include oily emollient components, specifically neopentyl glycol dicaprate, triethylhexanoin, isononyl isononanoate, isotridecyl isononanoate, diisostearyl malate, ethylhexyl palmitate, cetyl ethylhexanoate, dipentaerythrityl hexahydroxystearate, pentaerythrityl tetraisostearate, dimer dilinoleyl bis(behenyl / isostearyl / phytosteryl) dimer dilinoleate, jojoba esters, dimethicone, Examples include methylphenylpolysiloxane, diphenylsiloxyphenyl trimethicone, squalane, mineral oil, hydrogenated poly(C6-12 olefin), polyglyceryl-2 triisostearate, olive fruit oil, jojoba seed oil, lavender oil, evening primrose oil, avocado oil, camellia seed oil, macadamia seed oil, lauryl alcohol, myristyl alcohol, cetanol (cetyl alcohol), cetostearyl alcohol, stearyl alcohol, arachidyl alcohol, behenyl alcohol, and hexyldecanol. These can be used individually or in combination of two or more. The oil content is preferably 1% to 10% by mass. The oil phase content containing the oil is preferably 5% to 30% by mass. By keeping the oil content within the above range, the moisturizing effect on the skin is enhanced.

[0037] Hydrophilic emulsifiers are water-soluble emulsifiers that become soluble in water. For example, preferably, emulsifiers with a hydrophilic-lipophilic balance (HLB) of 8 or higher, more preferably emulsifiers with an HLB of 8 to 16, and even more preferably emulsifiers with an HLB of 9 to 14. Emulsifiers with an HLB of 10 to 12 include, for example, polyglyceryl-6 distearate, polyglyceryl-3 beeswax, polyglyceryl-6 laurate, polyglyceryl-10 myristate, polyglyceryl-10 stearate, and polyglyceryl-10 isostearate; polyoxyethylene glycerin fatty acid esters such as PEG-15 glyceryl stearate and PEG-15 glyceryl isostearate; polysorbate 40, polysorbate 60, polysorbate 80, and PE isostearate. Examples include polyoxyethylene sorbitan fatty acid esters such as G-20 sorbitan; polyoxyethylene sorbitan fatty acid esters such as sorbeth-6 laurate, sorbeth-40 tetraoleate, and sorbeth-60 tetraoleate; polyoxyethylene hydrogenated castor oil such as PEG-50 hydrogenated castor oil and PEG-60 hydrogenated castor oil; polyethylene glycol fatty acid esters such as PEG-10 laurate, PEG-10 stearate, and PEG-25 stearate; and lecithin derivatives such as hydrogenated lecithin and hydrogenated lysolecithin. The hydrophilic emulsifier may be one of these alone or a combination of two or more. By using a hydrophilic emulsifier, preferably polyglyceryl-6 distearate, stable emulsification of oil-in-water emulsion cosmetics can be achieved. The content of the hydrophilic emulsifier is preferably 0.2% to 5.0% by mass, for example, in order to promote emulsification of oil-in-water emulsion cosmetics.

[0038] The lipophilic emulsifier can be any emulsifier that is relatively poorly soluble in water. For example, it is preferably an emulsifier with an HLB of less than 8, more preferably an emulsifier with an HLB of 1 to 7, and even more preferably an emulsifier with an HLB of 3 to 6. Examples of emulsifiers with an HLB of 3 to 6 include sorbitan stearate, sorbitan isostearate, sorbitan sesquiisostearate, sorbitan monooleate, sorbitan sesquioleate, glyceryl stearate, glyceryl stearate (SE), polyglyceryl-2 triisostearate, polyglyceryl-2 diisostearate, polyglyceryl-2 distearate, polyglyceryl-2 oleate, and PEG-3 glyceryl isostearate. The lipophilic emulsifier may be one of these alone or a combination of two or more. The content of the lipophilic emulsifier is preferably 0% to 3% by mass, for example, in order to promote the emulsification of oil-in-water type emulsion cosmetics.

[0039] Examples of humectants include glycerin, concentrated glycerin, butylene glycol (BG), propylene glycol (PG), diglycerin, dipropylene glycol (DPG), pentylene glycol, 1,2-hexanediol, heptanediol, ethylhexylglycerin, methyl gluceth-10, methyl gluceth-20, PEG / PPG / polybutylene glycol-8 / 5 / 3 glycerin, polyquaternium-51, trehalose, xylitol, maltitol, maltose, sorbitol, erythritol, raffinose, glucose, fructose, hydrolyzed elastin, sodium lactate, pyrrolidone carboxylic acid, etc. These can be used individually or in combination of two or more. The content of the humectant is preferably 1% to 20% by mass. Including it within the above range enhances the moisturizing effect on the skin.

[0040] Examples of preservatives include phenoxyethanol, methylparaben, propylparaben, benzoic acid, salicylic acid, carbolic acid, sorbic acid, parachlormethacresol, hexachlorophene, benzalkonium chloride, chlorhexidine chloride, trichlorocarbanilide, and photosensitizers. These can be used individually or in combination of two or more. The preservative content is preferably 0% to 2% by mass.

[0041] Examples of chelating agents include alanine, disodium edetate, tetrasodium edetate, pentasodium diethylenetriaminepentaacetate, sodium polyphosphate, sodium metaphosphate, sodium phytate, and trisodium phosphate. These can be used individually or in combination of two or more. The chelating agent content is preferably around 0% to 0.5% by mass.

[0042] Examples of cooling agents include ethanol, menthol, menthylligolicinate, camphor, and methyl lactate menthyl ester. These can be used individually or in combination of two or more. The cooling agent content is preferably around 0% to 20% by mass. By including the cooling agent within this range, a cooling sensation can be obtained when the oil-in-water emulsion cosmetic of this embodiment is applied to the skin, making it easier to obtain a refreshing feeling.

[0043] Examples of antioxidants include vitamin E and its derivatives such as dibutylhydroxytoluene, butylhydroxyanisole, and δ-tocopherol; thiotaurine, evening primrose extract, β-carotene, catechin compounds, flavonoid compounds, polyphenol compounds, and sodium pyrosulfite. These can be used individually or in combination of two or more. The antioxidant content is preferably 0% to 1% by mass.

[0044] Examples of pH adjusting agents include lactic acid, citric acid, sodium citrate, glycolic acid, succinic acid, tartaric acid, malic acid, sodium malate, etidronic acid, potassium carbonate, sodium bicarbonate, ammonium bicarbonate, sodium hydroxide, potassium hydroxide, arginine, triethanolamine, and monoethanolamine. These can be used individually or in combination of two or more. The pH adjusting agent content is preferably 0% to 1% by mass. pH adjusting agents are also called neutralizing agents.

[0045] Examples of beauty ingredients include apple tannin, licorice root extract, resveratrol, isomerized sugar, Morinda citrus fruit juice, Citrus unshiu peel extract, retinol, niacinamide, vitamin C, dipotassium glycyrrhizate, stearyl glycyrrhetinate, tranexamic acid, and arbutin. These can be used individually or in combination of two or more. The content of the beauty ingredients is preferably 0% to 5% by mass.

[0046] Examples of colorants include metal oxides such as titanium dioxide, zinc oxide, iron oxide, red iron oxide, yellow iron oxide, red iron oxide, black iron oxide, Prussian blue, ultramarine blue, chromium oxide, and chromium hydroxide; metal complexes such as manganese violet and cobalt titanate; inorganic pigments such as carbon black; and Red No. 3, Red No. 104, Red No. 106, Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 226, and Red No. 227. Examples include synthetic organic pigments such as Red No. 228, Red No. 230, Red No. 401, Red No. 405, Red No. 505, Orange No. 203, Orange No. 204, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow No. 401, Blue No. 1, and Blue No. 404; natural organic pigments such as β-carotene, caramel, and paprika pigment; and pearl pigments in which base particles such as mica are coated with titanium dioxide. These can be used individually or in combination of two or more. The colorant content is preferably 0% to 5% by mass. When using colorants, it is preferable to use oily agents such as polyhydroxystearic acid, polyglyceryl-2 triisostearate, diisostearyl malate, and triethylhexanoin as pigment dispersants.

[0047] [Properties] An oil-in-water emulsion cosmetic composition according to one embodiment of the present invention is not particularly limited in terms of appearance or other properties. In one embodiment of the present invention, the oil-in-water emulsion cosmetic composition is preferably a translucent or opaque milky white to white emulsion, and more preferably a creamy or lotion-like substance. One embodiment of this oil-in-water emulsion cosmetic composition is in a creamy or lotion-like state when left standing on a flat surface at 20°C. "Creamy" means that, at 20°C, using a BM-type viscometer ("VISCOMETER TVB-25L"; manufactured by Toki Sangyo Co., Ltd.), the viscosity value (mPa·s) immediately after the start of measurement, under the conditions of SPINDLE No. M3 and 12 rpm, is within the range of 30,000 mPa·s or higher. "Emulsified" means that the viscosity value (mPa·s) under the same conditions is within the range of 1,000 mPa·s to less than 30,000 mPa·s. In other words, the oil-in-water emulsion cosmetic composition of this embodiment has a viscosity of 1,000 mPa·s or more when left standing on a flat surface at 20°C. In this embodiment, since it is used as a mist spray, it needs to be sprayed uniformly from the spray container. This can be confirmed by visual inspection to ensure uniformity. Here, water-soluble clay minerals have the property of increasing viscosity when they come into contact with water due to their unique intersecting arrangement. However, when a certain pressure is applied, this structure temporarily collapses, reducing viscosity and making spray application easy. On the other hand, when water-soluble polymers are used, their structure does not break down even under pressure, causing clogging of the container, making them unsuitable for spray application. Furthermore, the oil-in-water emulsion cosmetic composition of this embodiment preferably has a pH of 7 to 8.

[0048] One embodiment of the present invention, an oil-in-water emulsion cosmetic, is not particularly limited in dosage form as long as it can be used as a mist spray, and can be applied to skincare cosmetics, body care cosmetics, base makeup cosmetics, and more specifically, to lotions, serums, sunscreen milks, makeup bases, liquid foundations, hand creams, neck cosmetics, etc.

[0049] One embodiment of the present invention, an oil-in-water emulsion cosmetic, can reduce or prevent sunburn by being sprayed directly onto the skin in a mist form. The oil-in-water emulsion cosmetic of one embodiment of the present invention is designed for use as a mist spray, and the spraying method is not particularly limited. For example, the oil-in-water emulsion cosmetic of one embodiment of the present invention can be made into a mist spray by filling it into a trigger-type spray container. Furthermore, the oil-in-water emulsion cosmetic of one embodiment of the present invention can prevent moisture evaporation from the skin surface due to the moisturizing effect of its oil content. In addition, by containing water and a humectant, the oil-in-water emulsion cosmetic of one embodiment of the present invention can improve dry skin or suppress further deterioration due to dryness.

[0050] In one embodiment of the present invention, the oil-in-water emulsion cosmetic temporarily loses viscosity due to the pressure generated during spraying, but regains viscosity once the pressure is released after spraying. In other words, the structure of the formulation returns to its original state after being sprayed onto the skin. As a result, even when the contact area with the skin is large, the formulation has a low risk of dripping and stays on the skin easily. This is achieved because aqueous clay minerals have a plate-like structure and, when in contact with water, adopt a unique intersecting arrangement that increases viscosity. In one embodiment of the present invention, the oil-in-water emulsion cosmetic is preferably a milky white to white or colored emulsion or cream.

[0051] [Application] The oil-in-water emulsion cosmetic of this embodiment is intended for use as a mist spray. That is, the oil-in-water emulsion cosmetic of this embodiment is filled into a trigger-type spray container or the like and used by spraying.

[0052] An oil-in-water emulsion cosmetic according to one aspect of the present invention can be obtained by emulsifying a mixture of components (A) and (B), and optionally other components. For example, an oil-in-water emulsion cosmetic according to one aspect of the present invention can be obtained by adding an oil phase containing component (A) to an aqueous phase containing component (B) and subjecting the mixture to an emulsification treatment. Alternatively, the aqueous phase and the oil phase may be reversed. Specifically, an oil-in-water emulsion cosmetic according to one aspect of the present invention can be prepared by the method described in the examples below.

[0053] In a method for producing an oil-in-water emulsion cosmetic, component (A), the ultraviolet absorber, is preferably incorporated into the internal phase (oil phase) from the viewpoint of solubility. Furthermore, a hydrophilic emulsifier such as polyglyceryl-6 distearate may be included as a component of either the aqueous phase or the oil phase.

[0054] The present invention will be described in more detail below using examples, but the present invention is not limited to these examples. Various embodiments are included in the present invention as long as they can solve the problems of the present invention. [Examples]

[0055] [1. Preparation of the test cosmetic] According to the formulations shown in Tables 1 and 2, various oil-in-water emulsion cosmetic compositions were prepared as test cosmetics using the following procedure. The numerical values ​​indicating the content of the components in the tables represent mass % (wt%).

[0056] A homogeneous aqueous phase was prepared by mixing and stirring components 1-13 at 80°C. A homogeneous oil phase was prepared by mixing and stirring components 15-21 at 80°C.

[0057] The prepared oil phase was added to the prepared aqueous phase and subjected to a suspension treatment by stirring and mixing using a disperser ("Labo-Solution"; manufactured by Primix) at 80°C at 3,000 rpm for 2 minutes to obtain a suspension. Component 14, which is an aqueous phase component, was added to the obtained suspension and subjected to an emulsification treatment by stirring and mixing using a disperser ("Labo-Solution"; manufactured by Primix) at 80°C at 3,000 rpm for 1 minute to obtain an emulsified product.

[0058] The resulting emulsified product was cooled to 30°C while being gently stirred with a paddle to obtain an oil-in-water emulsion cosmetic as the test cosmetic.

[0059] [2. Evaluation Method] (2-1) Stability The condition of the test cosmetic immediately after preparation was visually inspected, and its stability was evaluated according to the following criteria. ○: The entire cosmetic product is uniform, and no synergy, layer separation, or other emulsification defects are observed. ×: Separation of liquid and layers is observed in cosmetics.

[0060] (2-2) SPF boost effect The SPF value of the obtained test cosmetic was measured using the following procedure, and the SPF boost rate was evaluated. <Measurement method> The SPF value was measured using an SPF analyzer ("HM021224 UV-1000S"; manufactured by Labsphere) according to the following procedure.

[0061] A measurement plate was prepared by uniformly coating a PMMA plate HD6 ("HelioScreen Labs HELIOPLATE HD6"; manufactured by Labsphere) with 33 mg (approximately 1.32 mg / cm2) of each oil-in-water emulsion cosmetic. Then, nine measurements were taken from each plate using an SPF analyzer. The average of the nine obtained measurements was taken as the SPF value of the cosmetic. <Evaluation Method> The ratio of the SPF value of the reference example to the SPF values ​​of each other obtained oil-in-water emulsion cosmetic was calculated using the following formula. SPF boost effect: SPF boost rate (%) = (SPF value of each oil-in-water emulsion cosmetic) / (SPF value of the example) × 100 Furthermore, the calculated SPF boost rate was evaluated according to the following criteria. ◎: Compared to the reference example, the SPF value is extremely high (SPF boost rate: 150%~) ○: Compared to the reference example, the SPF value is higher (SPF boost rate: 110% to less than 150%) △: Compared to the reference example, the SPF value is equivalent (SPF boost rate: 100% to less than 110%) ×: SPF value decreased compared to the reference example (SPF boost rate: less than 100%) —: Evaluation impossible because an oil-in-water emulsion cosmetic could not be obtained.

[0062] (2-3) Sprayability The obtained test cosmetic was filled into a commercially available trigger-type spray bottle, and the spraying process was visually observed and evaluated based on the following evaluation criteria. ○: Sprayed uniformly in a mist-like form ×: Not in a mist form, but sprayed unevenly. —: Evaluation impossible because an oil-in-water emulsion cosmetic could not be obtained.

[0063] (2-4) Usability Three panelists trained in the sensory evaluation of cosmetics were subjected to a test application of the cosmetic product directly to their skin (upper arm) using a commercially available trigger-type spray container. They evaluated the "freshness" and "non-stickiness" of the product on the skin according to the following evaluation criteria. "Freshness" refers to the product spreading smoothly without any friction or heaviness from the beginning to the middle of application. "Non-stickiness" refers to the absence of any sticky or tacky feeling between the skin and fingers as the product dries towards the end of application. [Evaluation Criteria] 3 points: Fresh and non-sticky 2 points: Not moist or feels sticky. 1 point: Not moist, feels sticky.

[0064] Furthermore, the test cosmetic was evaluated based on the total score of the panelists, according to the following overall evaluation criteria. (The total value of the points from the above usability evaluation criteria was used.) [Overall Evaluation Criteria] 〇:7~9 points △:4~6 points ×: 3 points —: Evaluation impossible because an oil-in-water emulsion cosmetic could not be obtained. Furthermore, in Table 2, the same test as in Table 1 was conducted by the most skilled panelist among those who performed the sensory evaluation of the cosmetics. The user experience was evaluated using a system of 3 points for ○, 2 points for △, and 1 point for ×.

[0065] [3. Evaluation Results] The results of various measurements are shown in Tables 1 and 2. As shown in Table 1, the test cosmetics of Examples 1 to 5, which contained aqueous clay minerals along with UV absorbers, had a fresh and non-greasy feel. Furthermore, the test cosmetics of Examples 1 to 5 had higher SPF values ​​compared to the test cosmetic of Reference Example 1, despite having the same amount of UV absorber. In addition, since the test cosmetics of Examples 1 to 5 did not contain water-soluble polymers, they could be used as mist sprays. These can also be manufactured by reversing the oil phase and the aqueous phase. The pH of the test cosmetics of Examples 1 to 5 was in the range of 7 to 8.

[0066] In contrast, Comparative Example 1, in which the aqueous clay mineral content was below the lower limit, underwent phase separation immediately, and a stable test cosmetic could not be obtained.

[0067] Furthermore, in Comparative Example 2, which contained guar hydroxypropyltrimonium chloride instead of aqueous clay mineral, phase separation occurred immediately, and a stable test cosmetic could not be obtained.

[0068] Similarly, Comparative Example 3, which contained polyquaternium-10 instead of aqueous clay mineral, was a stable test cosmetic and showed an SPF boosting effect, but it had poor sprayability and a poor user experience.

[0069] Similarly, Comparative Examples 4-6, which contained talc, polyquaternium-4, or polyquaternium-51 instead of aqueous clay minerals, were stable test cosmetics, but their SPF values ​​were lower than Reference Example 1, and their usability was not good. In particular, Comparative Examples 4 and 5 also had poor sprayability.

[0070] Furthermore, Comparative Example 7, which contained aqueous clay mineral and xanthan gum along with a UV absorber, was a stable test cosmetic, exhibited excellent SPF boosting effects, and had a good feel, but it was difficult to use as a spray.

[0071] Comparative Example 8, which contained an aqueous clay mineral and zinc oxide along with a UV absorber, was a stable test cosmetic, but its SPF value was similar to that of Reference Example 2, which also contained zinc oxide, and it did not provide a refreshing feel, instead feeling sticky.

[0072] Similarly, Comparative Example 9, which contained aqueous clay mineral and titanium dioxide along with a UV absorber, was a stable test cosmetic, but its SPF value was similar to that of Reference Example 3, which also contained titanium dioxide, and it did not provide a refreshing feel, instead feeling sticky.

[0073] Based on these results, the oil-in-water emulsion cosmetic containing a water-soluble clay mineral along with a UV absorber, and free of water-soluble polymers and UV scattering agents, exhibited excellent SPF boosting effects, good stability, a refreshing feel, and was suitable for use as a mist spray.

[0074] [Table 1]

[0075] [Table 2]

[0076] The following is an excerpt of the product names used from the ingredients and raw materials listed in Tables 1 and 2. *1 Aluminum magnesium silicate: "Smecton-SA" (manufactured by Kunimine Industries Co., Ltd.) *2 Bentonite: "Kunipia-F" (manufactured by Kunimine Industries Co., Ltd.) *3 Xanthan gum: "Celtrol T" (manufactured by MP Gokyo Food & Chemical Co., Ltd.) *4 Polyquaternium-51:Water: "LIPIDURE-PMB" (manufactured by NOF Corporation) *5 (Sodium acrylate / sodium acryloyldimethyl taurate) copolymer: isohexadecane, polysorbate 80: "SIMULGEL EG QD" (manufactured by SEPPIC) *6 Polyglyceryl-6 distearate: Jojoba esters, polyglyceryl-3 beeswax, cetanol: "Emarium Melifera MB" (manufactured by Ikeda Bussan Co., Ltd.) *7 Ethylhexyl methoxycinnamate: "Ubinal MC80" (manufactured by BASF Japan) *8 Bis-ethylhexyloxyphenol methoxyphenyl triazine: "Tinosorb S" (manufactured by BASF Japan) *9 Diethylamino hydroxybenzoyl hexyl benzoate: "Ubinal A Plus Granular" (manufactured by BASF Japan) *10 Surface-treated zinc oxide (fine particles): Ethylhexyl palmitate, polyhydroxystearic acid: "IOPP60ZSJ" (manufactured by KOBO Dispatec, particle size 20 nm, powder concentration 60%) *11 Surface-treated titanium dioxide (fine particles), ethylhexyl palmitate, polyhydroxystearic acid: "IOPP40TK1J" (manufactured by KOBO Dispatec, particle size 15nm, powder concentration 40%) [Industrial applicability]

[0077] One embodiment of the present invention, an oil-in-water emulsion cosmetic, exhibits excellent SPF boosting effects, good stability, and a refreshing feel, making it suitable for use as a sunscreen cosmetic. Furthermore, this embodiment is designed for use as a spray, and users can expect to comfortably protect their skin from ultraviolet rays and prevent sunburn on a daily basis by using the oil-in-water emulsion cosmetic of one embodiment of the present invention as a mist spray.

Claims

1. Oil-in-water emulsion cosmetic, It contains the following ingredients (A) to (B): (A) UV absorber (B) Aqueous clay minerals The content of component (A) is 1% by mass to 25% by mass, The content of component (B) is 1.1% by mass to 5.0% by mass. The oil-in-water emulsion cosmetic composition may optionally contain (E) ethanol. The (E) ethanol content is characterized by being 20% ​​by mass or less relative to the total mass of the oil-in-water emulsion cosmetic, The aforementioned oil-in-water emulsion cosmetic composition (C) Water-soluble polymers and (D) UV scattering agent A skin cosmetic used in mist sprays that substantially does not contain [the specified ingredient].

2. Oil-in-water emulsion cosmetic, It contains the following ingredients (A) to (B): (A) UV absorber (B) Aqueous clay minerals The aforementioned component (B) is magnesium aluminum silicate, and the content of the magnesium aluminum silicate is 1.2% by mass to 2.0% by mass. The aforementioned oil-in-water emulsion cosmetic composition (C) Water-soluble polymers and (D) UV scattering agent Cosmetics used in mist sprays that substantially do not contain [specific ingredient].

3. Oil-in-water emulsion cosmetic, It contains the following ingredients (A) to (B): (A) UV absorber (B) Aqueous clay minerals The aforementioned component (A) consists of an oil-soluble ultraviolet absorber, and the content of the aforementioned component (B) is 1.0% by mass to 5.0% by mass. The aforementioned oil-in-water emulsion cosmetic composition (C) Water-soluble polymers and (D) UV scattering agent Cosmetics used in mist sprays that substantially do not contain [specific ingredient].

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