Powder dispersion composition, emulsion composition, and cosmetic

Abstract

A composition obtained by dispersion of a metal oxide powder (D) in a medium containing a volatile oil (A), an ultraviolet ray absorber (B), and a polyglycerin-modified silicone (C), wherein the volatile oil (A) contains a volatile alkane oil (A1), and the value of a ratio of the contained amount of the volatile alkane oil (A1) with respect to the contained amount of the volatile oil (A) is not less than 0.5.

Description

[Technical Field]

[0001] The present invention relates to a powder dispersion composition, an emulsion composition, and a cosmetic. [Background technology]

[0002] Cosmetics containing metal oxide powders, such as UV scattering agents and pigments, are known for use in skin-applied products such as foundations and sunscreens. These cosmetics include oil-based cosmetics that use a powder dispersion composition in which the powder is dispersed in an oily medium, and emulsion cosmetics, such as oil-in-water emulsions or water-in-oil emulsions, that are obtained by emulsifying and mixing other components, such as aqueous components, with this powder dispersion composition as a base. Volatile oils are typically used as oily media to impart a refreshing feel to the skin. For example, Patent Documents 1 and 2 disclose powder dispersion compositions in which surface-treated fine particle metal oxides are dispersed in a dispersant and a volatile oil, and cosmetics that use these powder dispersion compositions. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-184178 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-143852 Summary of the Invention [Problem to be solved by the invention]

[0004] It is also well known that an ultraviolet absorber is further blended to improve the ultraviolet protection effect of a skin-applied product. However, blending an ultraviolet absorber can sometimes deteriorate the powder dispersibility in the oil phase. As a result, it is known that the ultraviolet protection effect of the ultraviolet scattering agent is not fully exerted and the color development of the pigment is reduced. Furthermore, if a powder dispersion composition is prepared by selecting components with priority given to powder dispersibility, the good tactile feel, particularly the refreshing feeling, of the cosmetic product using the powder dispersion composition may be impaired.

[0005] In view of the above, one aspect of the present invention aims to provide a powder dispersion composition that contains an ultraviolet absorber, in which the powder is well dispersed, and that provides an excellent refreshing feeling when incorporated into cosmetics. [Means for solving the problem]

[0006] In order to solve the above problems, one aspect of the present invention is a powder dispersion composition comprising (D) a metal oxide powder dispersed in a medium containing (A) a volatile oil, (B) an ultraviolet absorber, and (C) a polyglycerin-modified silicone, wherein the (A) volatile oil contains (A1) a volatile alkane oil, and the ratio of the content of the (A1) volatile alkane oil to the content of the (A) volatile oil is 0.5 or more. [Effects of the Invention]

[0007] According to one aspect of the present invention, it is possible to provide a powder dispersion composition which contains an ultraviolet absorber, in which the powder is well dispersed, and which provides an excellent refreshing feeling when used in cosmetics. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments of the present invention will be described in detail, but the present invention is not limited to the following embodiments.

[0009] <Powder dispersion composition> One embodiment of the powder dispersion composition according to this aspect is a slurry-like composition in which (D) metal oxide powder is dispersed in a medium containing (A) a volatile oil, (B) an ultraviolet absorber, and (C) a polyglycerin-modified silicone, wherein the (A) volatile oil contains (A1) a volatile alkane oil, and the ratio of the content of the (A1) volatile alkane oil to the content of the (A) volatile oil is 0.5 or more.

[0010] In this embodiment, the powder dispersion composition may be obtained by dispersing (D) a metal oxide powder in a dispersion medium substantially consisting of an oil component. In this embodiment, 98% by mass or more, preferably 99% by mass or more of the dispersion medium is an oil component, and it is more preferable that the dispersion medium is entirely an oil component. The oil component may include an oil component that is solid at room temperature (25°C) and an oil component that is liquid. In this embodiment, the dispersion medium to which a dispersant has been added is referred to as a medium.

[0011] The powder dispersion composition of this embodiment contains an ultraviolet absorber and has a well-dispersed powder. A well-dispersed powder or high powder dispersibility means that the powder is uniformly dispersed without agglomeration, i.e., many particles of the powder are present in the composition in a fine state of the order of 100 nm or less. The dispersibility of a given amount of a given powder can be measured or evaluated by determining the relationship between shear rate and viscosity. More specifically, a rheometer is used to measure the viscosity of a powder dispersion composition in which a given amount of a given powder is dispersed while gradually increasing or decreasing the shear rate, and the change in viscosity is analyzed. In this embodiment, for example, at a shear rate of 100 s -1 First viscosity and shear rate at 1000 s -1 The difference between the first viscosity and the second viscosity at the first shear rate is divided by the first viscosity to obtain the viscosity decay rate, and dispersibility can be evaluated based on this viscosity decay rate. The smaller the viscosity decay rate, the lower the shear thinning (the tendency for viscosity to decrease with increasing shear rate) and the better the dispersibility. The larger the viscosity decay rate, the higher the shear thinning, and the powder is likely to aggregate or be prone to aggregate.

[0012] The powder dispersion composition of the present invention may be in any possible form as a composition, such as an oily composition in which a powder is dispersed in the oily component, an emulsion composition in which a powder is dispersed in an oil-in-water emulsion, or an emulsion composition in which a powder is dispersed in a water-in-oil emulsion.

[0013] <(A) Volatile Oil> The (A) volatile oil is an oil that is volatile at 1 atmosphere and 25°C. The (A) volatile oil may also be an oil having a boiling point of 250°C or lower at 1 atmosphere. Examples of the (A) volatile oil include volatile alkane oils and volatile silicone oils.

[0014] The content of (A) volatile oil can be preferably 25% by mass or more and 65% by mass or less, more preferably 30% by mass or more and 60% by mass or less, even more preferably 35% by mass or more and 55% by mass or less, and even more preferably 40% by mass or more and 50% by mass or less, relative to the total amount of the powder dispersion composition. By setting the content of (A) volatile oil within the above range, a refreshing feel can be achieved when or after applying the powder dispersion composition, and also when or after applying a cosmetic product obtained using the powder dispersion composition.

[0015] In this specification, the terms "refreshing feel" and "refreshing sensation" refer to the non-sticky, refreshing sensation felt by the user's fingers and / or skin when applying a cosmetic to the body surface with the fingers and / or after application. They may also include the sensation felt by the user when touching the skin with the fingers again after application.

[0016] The content of the (A) volatile oil may be preferably 50% by mass or more and 90% by mass or less, more preferably 60% by mass or more and 80% by mass or less, based on the total amount of the dispersion medium in the powder dispersion composition. By setting the content of the (A) volatile oil within the above range, a refreshing feel can be imparted to the powder dispersion composition, and further, a similarly good feel can be imparted to cosmetics and the like obtained using the powder dispersion composition.

[0017] <(A1) Volatile alkane oil> The (A) volatile oil may include (A1) a volatile alkane oil. The (A1) volatile alkane oil may be an alkane oil having 10 to 15 carbon atoms. The (A1) volatile alkane oil is preferably a branched alkane, since this can impart appropriate volatility to the powder dispersion composition and cosmetics and the like using the same.

[0018] Specific examples of the (A1) volatile alkane oil include isododecane, isodecane, isohexadecane, and hydrogenated polyisobutene (light isoparaffin). These (A1) volatile alkane oils can be used alone or in combination of two or more. Among the (A1) volatile alkane oils listed above, isododecane is preferred because it provides a refreshing feel to the touch.

[0019] When the (A1) volatile alkane oil contains isododecane, the proportion of the isododecane content relative to the total amount of the (A1) volatile alkane oil may be preferably 50% by mass or more, more preferably 75% by mass or more, and even more preferably 90% by mass. Furthermore, it is more preferable that the (A1) volatile alkane oil consists of isododecane.

[0020] The ratio of the content of (A1) volatile alkane oil to the total content of (A) volatile oils ([amount of (A1) volatile alkane oil] / [total amount of (A) volatile oils]) may be 0.5 or more, preferably 0.8 or more, more preferably 0.9 or more. The ratio of the content of (A1) volatile alkane oil to the total content of (A) volatile oils may be 1, that is, the (A) volatile oil may be (A1) volatile alkane oil.

[0021] By setting the ratio of the content of (A1) volatile alkane oil to the total content of (A) volatile oils to be 0.5 or more, the dispersibility of (D) metal oxide powder contained in the powder dispersion composition can be improved. Furthermore, the (B) UV absorber can be mixed more uniformly in the oil-based medium, and in particular, the (B) UV absorber and the (A2) volatile silicone oil described below can be mixed more effectively. This allows for a powder dispersion composition in which each component is uniformly mixed and dispersed without separation of the oil-based medium, thereby allowing each component to exhibit its functions (such as UV protection ability and skin concealment, i.e., covering power) well.

[0022] <(A2) Volatile silicone oil> The volatile oil (A) may contain a volatile silicone oil (A2). When the powder dispersion composition contains the volatile silicone oil (A2), the powder dispersion composition can have a softer and smoother feel when applied, and further, the powder dispersion composition can have a softer and smoother feel when applied to cosmetics and the like obtained using the powder dispersion composition.

[0023] Specific examples of (A2) volatile silicone oils include linear polysiloxanes such as dimethylpolysiloxane (dimethicone), methylphenylpolysiloxane, and diphenylpolysiloxane, and cyclic polysiloxanes such as decamethylcyclopentasiloxane, octamethylcyclotetrasiloxane, and dodecamethylcyclohexasiloxane. Furthermore, (A2) volatile silicone oils may be modified silicones (modified polysiloxanes) modified with amino, fluorine, alkyl, or the like, as long as they do not impair volatility and do not interfere with the effect of improving the feel to the touch. These (A2) volatile silicone oils may be used alone or in combination of two or more.

[0024] Of the above (A2) volatile silicone oils, it is more preferable to use cyclic polysiloxanes and dimethylpolysiloxanes, as they provide a more refreshing feel.

[0025] From the viewpoint of improving the dispersibility of the (D) metal oxide powder contained in the powder dispersion composition and enabling the (B) ultraviolet absorber to be mixed more uniformly in the oil-based medium, the ratio of the content of the (A2) volatile silicone oil to the total content of the (A) volatile oils ([amount of (A2) volatile silicone oil] / [total amount of (A) volatile oils]) can be preferably 0.5 or less, more preferably 0.2 or less, even more preferably 0.1 or less, and even more preferably 0. Furthermore, from the viewpoint of further improving the tactile sensation such as a refreshing feel, the ratio of the content of the (A2) volatile silicone oil to the total content of the (A) volatile oils can be 0.1 or more.

[0026] The content of (A2) volatile silicone oil can be set to preferably 25% by mass or less, more preferably 15% by mass or less, even more preferably 5% by mass or less, and even more preferably 0% by mass, from the viewpoint of improving the dispersibility of (D) metal oxide powder contained in the powder dispersion composition and enabling (B) ultraviolet absorber to be mixed more uniformly in the oily medium. Furthermore, from the viewpoint of further improving the tactile sensation such as a refreshing feeling, the content of (A2) volatile silicone oil can be set to 5% by mass or more based on the total amount of the powder dispersion composition.

[0027] From the viewpoint of improving the feel to the touch, the (A2) volatile silicone oil preferably has a viscosity at 25°C of 10 mPa·s or less, and more preferably 5 mPa·s or less.

[0028] <(B) Ultraviolet absorber>

[0029] The powder dispersion composition of this embodiment contains (B) an ultraviolet absorber. (B) The ultraviolet absorber is a polar oil, i.e., an oily component with relatively high polarity, commonly used in cosmetics. As will be apparent from the following examples, (B) the ultraviolet absorber may be either solid or liquid at room temperature (25°C).

[0030] The type of (B) ultraviolet absorber is not particularly limited, and examples thereof include benzoic acid derivatives, salicylic acid derivatives, cinnamic acid derivatives, dibenzoylmethane derivatives, β,β-diphenylacrylate derivatives, benzophenone derivatives, benzylidene camphor derivatives, phenylbenzimidazole derivatives, triazine derivatives, phenylbenzotriazole derivatives, anthranil derivatives, imidazoline derivatives, benzalmalonate derivatives, 4,4-diarylbutadiene derivatives, silicone derivatives, etc. More specific examples are listed below.

[0031] Benzoic acid derivatives include ethyl p-aminobenzoate (PABA), ethyl-dihydroxypropyl PABA, ethylhexyl-dimethyl PABA, glyceryl PABA, PEG-25-PABA, and diethylaminohydroxybenzoylhexyl benzoate.

[0032] Salicylic acid derivatives include homosalate, ethylhexyl salicylate (octyl salicylate), dipropylene glycol salicylate, and TEA salicylate.

[0033] Examples of cinnamic acid derivatives include octyl methoxycinnamate (ethylhexyl methoxycinnamate), isopropyl methoxycinnamate, isoamyl methoxycinnamate, cinoxate, DEA methoxycinnamate, diisopropyl methylcinnamate, glyceryl-ethylhexanoate-dimethoxycinnamate, and di-(2-ethylhexyl)-4'-methoxybenzalmalonate.

[0034] Examples of dibenzoylmethane derivatives include butyl methoxydibenzoylmethane (4-tert-butyl-4'-methoxydibenzoylmethane), etc. Examples of β,β-diphenylacrylate derivatives include octocrylene, etc.

[0035] Examples of the benzophenone derivatives include benzophenone-1, benzophenone-2, benzophenone-3 or oxybenzone, benzophenone-4, benzophenone-5, benzophenone-6, benzophenone-8, benzophenone-9, and benzophenone-12.

[0036] Examples of benzylidene camphor derivatives include 3-benzylidene camphor, 4-methylbenzylidene camphor, benzylidene camphorsulfonic acid, benzalkonium camphor methosulfate, terephthalidene discamphorsulfonic acid, and polyacrylamidomethylbenzylidene camphor.

[0037] Examples of the phenylbenzimidazole derivatives include phenylbenzimidazole sulfonic acid and disodium phenyldibenzimidazole tetrasulfonate.

[0038] Examples of triazine derivatives include anisotriazine (bisethylhexyloxyphenol methoxyphenyl triazine), ethylhexyl triazone, diethylhexylbutamido triazone, and 2,4,6-tris(diisobutyl-4'-aminobenzalmalonate)-s-triazine.

[0039] Examples of phenylbenzotriazole derivatives include drometrizole trisiloxane and methylene bis(benzotriazolyl tetramethylbutylphenol).

[0040] Examples of anthranil derivatives include menthyl anthranilate. Examples of imidazoline derivatives include ethylhexyl dimethoxybenzylidene dioxoimidazolidine propionate. Examples of benzalmalonate derivatives include polyorganosiloxanes having benzalmalonate functional groups. Examples of 4,4-diarylbutadiene derivatives include 1,1-dicarboxy(2,2'-dimethylpropyl)-4,4-diphenylbutadiene. Examples of silicone derivatives include polysilicone-14 and polysilicone-15.

[0041] The above (B) ultraviolet absorbers may be used alone or in combination of two or more kinds.

[0042] The content of (B) ultraviolet absorber may be preferably 5% by mass or more and 35% by mass or less, more preferably 10% by mass or more and 30% by mass or less, based on the total amount of the powder dispersion composition. By setting the content of (B) ultraviolet absorber within this range, it is possible to enhance the ultraviolet absorbing effect of the powder dispersion composition and cosmetics and the like using it, and to maintain a good dispersion state of the powder in the powder dispersion composition and cosmetics and the like using it.

[0043] Furthermore, the ratio of the content of the (A) volatile oil to the content of the (B) UV absorber ([amount of (A) volatile oil] / [amount of (B) UV absorber]) may preferably be from 1 to 5, more preferably from 1.5 to 4, and even more preferably from 2 to 3. By setting the ratio of the content of the (A) volatile oil to the content of the (B) UV absorber within the above range, the (B) UV absorber can be well miscible with other oil-based media, and stickiness caused by the UV absorber can be eliminated or reduced. This improves the UV absorption function of the (B) UV absorber in the powder dispersion composition and cosmetics and the like using the same, and further provides a refreshing, non-sticky feel.

[0044] <(C) Polyglycerin-modified silicone> In this embodiment, the (C) polyglycerin-modified silicone can function as a dispersant. The (C) polyglycerin-modified silicone is a polymer compound having both a glycerin chain moiety and a silicone chain moiety. The glycerin chain moiety can be well adsorbed to powders, particularly the (D) metal oxide powder described below, and the silicone chain moiety can be well dissolved in oily components. Therefore, by using the (C) polyglycerin-modified silicone, the (D) metal oxide powder can be well dispersed in the oily component and further in the powder dispersion composition.

[0045] The (C) polyglycerin-modified silicone may be a compound in which a polyglycerin side chain has been introduced into a silicone main chain, or may be a block copolymer of a silicone chain and a polyglycerin chain (polyether group). The (C) polyglycerin-modified silicone used in this embodiment is particularly preferably glycerin or polyglycerin both ends of which are modified with silicone (sometimes referred to as both-ends silicone-modified glycerin or both-ends silicone-modified polyglycerin).

[0046] The (C) polyglycerin-modified silicone may be a glycerin modified at both ends with silicone, represented by the following structural formula (1), preferably structural formula (2).

[0047] [ka]

[0048] In the above formula, R1 is a linear or branched alkyl group having 1 to 12 carbon atoms or a phenyl group, R2 is an alkyl group having 2 to 11 carbon atoms, m is 10 to 120, and n is 1 to 11.

[0049] [ka]

[0050] In the formula, R1 is a linear or branched alkyl group having 1 to 12 carbon atoms or a phenyl group, m is 10 to 120, and n is 1 to 11.

[0051] The hydrophilic-lipophilic balance (HLB) of the (C) polyglycerin-modified silicone is preferably 0.2 to 3.0. The HLB value may be calculated using the Griffin formula (HLB value = molecular weight of glycerin portion × 20 / total molecular weight). The molecular weight of the (C) polyglycerin-modified silicone is preferably 2,000 to 20,000.

[0052] Specific examples of (C) polyglycerin-modified silicones include polyglyceryl-3 disiloxane dimethicone, polyglyceryl-3 polydimethylsiloxyethyl dimethicone, lauryl polyglyceryl-3 polydimethylsiloxyethyl dimethicone, bis-butyl dimethicone polyglyceryl-3, (dimethicone / polyglycerin-3) crosspolymer, (lauryl dimethicone / polyglycerin-3) crosspolymer, (polyglyceryl-3 / lauryl polydimethylsiloxyethyl dimethicone) crosspolymer, etc. These (C) polyglycerin-modified silicones can be used alone or in combination of two or more.

[0053] Commercially available products of (C) polyglycerin-modified silicone include KF-6100, KF-6104, KF-6105, KF-6106, KF-6109, KSG-710, KSG-810, KSG-820, KSG-830, KSG-840, KSG-820Z, and KSG-850Z manufactured by Shin-Etsu Chemical Co., Ltd.

[0054] The (C) polyglycerin-modified silicone used in this embodiment is preferably a non-crosslinked polyglycerin-modified silicone that does not form a crosspolymer, and more preferably one or more of polyglyceryl-3 disiloxane dimethicone, polyglyceryl-3 polydimethylsiloxyethyl dimethicone, lauryl polyglyceryl-3 polydimethylsiloxyethyl dimethicone, and bisbutyl dimethicone polyglyceryl-3. Furthermore, bisbutyl dimethicone polyglyceryl-3 is preferably used because it has a particularly high ability to disperse the (D) metal oxide powder in oily components.

[0055] The content of (C) polyglycerin-modified silicone may be preferably 0.01% by mass or more and 5% by mass or less, more preferably 0.05% by mass or more and 4% by mass or less, and even more preferably 0.1% by mass or more and 3% by mass or less, based on the total amount of the powder dispersion composition. By keeping the content of (C) polyglycerin-modified silicone within this range, the dispersibility of (D) metal oxide powder can be improved, and a refreshing, non-sticky feel can be achieved when used in cosmetics.

[0056] <(D) Metal oxide powder> The metal oxide powder (D) in this embodiment may be a powder having an ultraviolet scattering function, i.e., an ultraviolet scattering agent or a pigment. The ultraviolet scattering agent may have an average primary particle size of 100 nm or less. The pigment may have an average primary particle size in the range of 100 nm to 500 nm.

[0057] Specific examples of the (D) metal oxide powder include titanium oxide, zinc oxide, tin oxide, cerium oxide, talc, silica, mica, sericite, kaolin, mica titanium, black iron oxide, yellow iron oxide, red iron oxide, ultramarine, Prussian blue, chromium oxide, and chromium hydroxide. The (D) metal oxide powder may also be a powder consisting of particles other than titanium oxide coated with titanium oxide. These (D) metal oxide powders may be used alone or in combination of two or more.

[0058] Among the above specific examples, one or more of fine particle titanium oxide and fine particle zinc oxide are preferred because they have a high UV protection function as an UV scattering agent and are easy to handle, and one or more of pigment-grade titanium oxide, black iron oxide, yellow iron oxide, and red iron oxide are preferred because they have high hiding power as a pigment.

[0059] The particle surface of the (D) metal oxide powder may be hydrophobized. This allows the (D) metal oxide powder to be more easily dispersed in an oily component. The (D) metal oxide powder can be hydrophobized by a hydrophobic treatment in which hydrophobic groups are introduced to the particle surface of the powder or a coating of a hydrophobic substance is formed. The hydrophobic treatment may be a wet method using a solvent, a gas phase method, a mechanochemical method, or the like. Examples of treating agents for the hydrophobic treatment include silicones such as methylhydrogenpolysiloxane and dimethylpolysiloxane, silane coupling agents such as triethoxycaprylylsilane, hydrocarbons such as squalane and paraffin, dextrin fatty acid esters, higher fatty acids, higher alcohols, fatty acid esters, metal soaps, alkyl phosphate ethers, and fluorine compounds.

[0060] The content of the (D) metal oxide powder may be preferably 15% by mass to 60% by mass, more preferably 20% by mass to 50% by mass, and even more preferably 25% by mass to 40% by mass, based on the total amount of the powder dispersion composition. By setting the content of the (D) metal oxide powder within this range, it is possible to improve the UV protection function and covering power of the powder dispersion composition and cosmetics using the same, and it is also possible to maintain good dispersibility of the (D) metal oxide powder.

[0061] <Other oily ingredients> The powder dispersion composition of this embodiment may contain oily components other than the above-mentioned (A) volatile oil and (B) ultraviolet absorber.

[0062] For example, the powder dispersion composition may contain a non-volatile oil (non-volatile oil, excluding UV absorbers in this specification). For example, the powder dispersion composition may contain a non-volatile alkane oil (non-volatile alkane oil). The non-volatile alkane oil may be a linear or branched hydrocarbon oil, and specific examples include liquid paraffin, ozokerite, squalane, pristane, paraffin, ceresin, squalene, petrolatum, microcrystalline wax, etc. Furthermore, the powder dispersion composition may contain a non-volatile silicone oil (non-volatile silicone oil) such as a high-molecular-weight polymethylsiloxane.

[0063] When the powder dispersion composition contains a non-volatile oil (excluding an ultraviolet absorber), the content of the non-volatile oil may be 10% by mass or less, preferably 5% by mass or less, more preferably 3% by mass or less, based on the total amount of the powder dispersion composition.More preferably, the powder dispersion composition contains substantially no or no non-volatile oil.

[0064] The powder dispersion composition according to this embodiment may also contain a polar oil other than the UV absorber, such as an ester oil. The ester oil may be a monoester, a diester, a carbonate ester, or the like, and may also be an aliphatic ester or an aromatic ester. Furthermore, the powder dispersion composition according to this embodiment may also contain, as an oil component, a higher fatty acid, a higher alcohol, a liquid oil or fat, a solid oil or fat, a wax, a fragrance, or the like.

[0065] <Emulsified composition> An emulsion composition can be obtained using the above-mentioned powder dispersion composition and an aqueous component, etc. The emulsion composition may be a water-in-oil type composition or an oil-in-water type composition.

[0066] The aqueous component is not particularly limited as long as it is an aqueous component that is commonly used in external compositions such as cosmetics, quasi-drugs, etc. Examples of the aqueous component that can be used include water, water-soluble alcohols, thickeners, moisturizers, chelating agents, preservatives, and pigments.

[0067] Examples of water that can be used include purified water, ion-exchanged water, tap water, etc. Examples of water-soluble alcohols include lower alcohols, polyhydric alcohols, polyhydric alcohol polymers, alcohol alkyl ethers, alcohol ether esters, glycerin monoalkyl ethers, sugar alcohols, monosaccharides, oligosaccharides, polysaccharides, and derivatives thereof.

[0068] In addition, when preparing the emulsion composition, surfactants such as oil gelling agents and emulsifiers, powders other than (D) metal oxide powder, antioxidants, preservatives, anti-inflammatory agents, whitening agents, plant extracts, activators, blood circulation promoters, antiseborrheic agents, etc. may be further added. Furthermore, the above-mentioned other oily components may also be added when preparing the emulsion composition. These components may be added in amounts that do not impair the stability, UV protection effect, or covering power of the emulsion composition.

[0069] <Cosmetics> The compositions obtained in this embodiment (the above-described powder dispersion composition and emulsion composition using the same) may be sunscreens for the body or face, or may be cosmetics or personal care products with high sunscreen activity (UV blocking activity). Cosmetics include, for example, basic cosmetics such as foundation and base makeup, and makeup cosmetics, and personal care products include hand cream, body cream, and the like.

[0070] As described above, according to this embodiment, a powder dispersion composition containing an ultraviolet absorber and in which the powder is well dispersed can be obtained, and by using this powder dispersion composition, an emulsion composition containing an ultraviolet absorber and in which the powder is well dispersed can be obtained. Therefore, the ultraviolet absorber and metal oxide powder, particularly the fine powder having ultraviolet scattering function, are uniformly dispersed, and a high ultraviolet protection function can be exhibited. Therefore, compared to a composition containing the same amount of ultraviolet absorber and ultraviolet scattering agent, a higher ultraviolet protection effect can be exhibited. [Example]

[0071] The components shown in Table 1 were mixed in a conventional manner to prepare the examples. 、 Comparative Example and reference examples The powder dispersion compositions were prepared and evaluated. The results are shown in Table 1. The compositions were evaluated by the following methods.

[0072] <Evaluation of powder dispersibility> The dispersibility of the powder was evaluated by the viscosity decay rate. More specifically, the viscosity was measured at 25°C using a rheometer (MCR302, manufactured by Anton Paar) while gradually increasing the shear rate applied to the obtained powder dispersion composition. Then, at a shear rate of 100 s -1 Viscosity η(100s -1 ) and shear rate 1000 s -1 Viscosity η (1000s -1 ) was recorded, and the viscosity decay rate was calculated using the following formula.

[0073] Viscosity decay rate={η(100s -1)‐η(1000s -1 )} / η(100s -1 )

[0074] The smaller the viscosity decay rate, the smaller the degree of viscosity change with increasing shear rate, and the higher the dispersibility of the powder can be evaluated.

[0075] <Incorporation into emulsion cosmetics and evaluation of texture> Of the obtained powder dispersion compositions, compositions that showed good dispersibility (viscosity decay rate of 0.2 or less) were further used with other components such as aqueous components to prepare emulsion cosmetics according to Table 2. In preparing the emulsion cosmetics, all components except the water-soluble components (purified water, ethanol, and dipropylene glycol) were mixed, and then the mixture of water-soluble components was added to this while stirring with a homogenizer, thereby obtaining a water-in-oil emulsion composition.

[0076] The usability of the obtained emulsion cosmetics was evaluated in a practical use test by 10 panelists. The "refreshing feeling" when each emulsion cosmetic was applied to the skin was judged according to the following criteria.

[0077] A: More than 8 out of 10 people answered that it was good.

[0078] B: 4 to 7 out of 10 people answered that it was good.

[0079] C: Less than 3 out of 10 people answered that it was good.

[0080] [Table 1]

[0081] In Table 1, *1: Teika "MZY-510M3S" Dimethicone / Hydrogen Dimethicone Treated Zinc Oxide *2: Sakai Chemical Industry Co., Ltd. "FINEX-51W-LP3" Dimethicone / Hydrated Silica-Treated Zinc Oxide *3: Teika "MT-014V" Stearic acid / aluminum hydroxide treated titanium dioxide *4: Titanium Industries "ST-485SA" Stearic acid / Al hydroxide treated titanium dioxide *5: Teika "OTQ-MT100Si" Alkoxysilane / distearyldimethylammonium chloride / hydrated silica-treated titanium dioxide *6: Ishihara Sangyo Kaisha's "Tipak CR-50" Aluminum hydroxide treated titanium dioxide *7: "Silicone KF6038" manufactured by Shin-Etsu Chemical Co., Ltd. Lauryl PEG-9 Polydimethylsiloxyethyl Dimethicone

[0082] [Table 2] The blending amount of each component in Tables 1 and 2 is expressed in mass %.

[0083] From Table 1, the ratio of the content of volatile alkane oil to the content of total volatile oil is relatively large in the examples. 3 ~9 and Reference Examples 1 and 2 It was found that the resulting cosmetic has a low viscosity decay rate, high powder dispersibility, and an excellent refreshing feeling.

[0084] On the other hand, the ratio of the content of volatile alkane oil to the content of total volatile oil is 3 ~8 and Reference Examples 1 and 2 The smaller dispersibility of Comparative Examples 1 and 2 is 3 ~9 and Reference Examples 1 and 2 In addition, the ratio of the total volatile oil content to the ultraviolet absorber content was lower than that of the examples. 3 ~9 and Reference Examples 1 and 2 The smaller dispersibility of Comparative Example 3 is also 3 ~9 and Reference Examples 1 and 2 Furthermore, the ratio of the content of volatile alkane oil to the content of total volatile oil was lower than that of Example 1. 3 The dispersibility of Comparative Examples 4 and 5, which are the same as those of Examples 1 to 9 but do not contain bisbutyldimethicone polyglyceryl-3 (polyglycerin-modified silicone), is 3~ 9 was lower than

[0085] Example using bis-butyl dimethicone polyglyceryl-3 3 ~9 and Reference Examples 1 and 2 On the other hand, in Comparative Examples 6 and 7, which did not contain bisbutyldimethicone polyglyceryl-3 and used polyhydroxystearic acid and polyoxyalkylene-alkyl co-modified organopolysiloxane as dispersants, respectively, the viscosity attenuation rate was lower than that of Examples 1 and 2. 3 ~9 and Reference Examples 1 and 2 However, the refreshing feeling when blended into cosmetics was as low as in Example 3 ~9 and Reference Examples 1 and 2 was found to be inferior compared to

[0086] This application claims priority based on Japanese Patent Application No. 2020-014543, filed with the Japan Patent Office on January 31, 2020, the entire contents of which are incorporated herein by reference.

Claims

1. Aqueous ingredients and (A) a volatile oil, (B) an ultraviolet absorber, and (C) In a medium containing a polyglycerin-modified silicone, (D) A powder dispersion composition in which a metal oxide powder is dispersed, (i) the (A) volatile oil contains (A1) a volatile alkane oil, and the ratio of the content of the (A1) volatile alkane oil to the content of the (A) volatile oil is 0.8 or more; (ii) the ratio of the content of the (A) volatile oil to the content of the (B) ultraviolet absorber is 2 or more and 3 or less; (iii) A powder dispersion composition in which the content of the (D) metal oxide powder is 25% by mass or more and 50% by mass or less relative to the total amount of the powder dispersion composition.

2. 2. The powder dispersion composition of claim 1, wherein the (A) volatile oil further comprises (A2) a volatile silicone oil.

3. The powder dispersion composition according to claim 1 or 2, wherein the (A1) volatile alkane oil comprises one or more selected from isododecane, isodecane, isohexadecane, and hydrogenated polyisobutene.

4. The powder dispersion composition according to claim 1 , wherein the polyglycerin-modified silicone (C) is a glycerin that is silicone-terminated at both ends.

5. An emulsion composition comprising the powder dispersion composition according to any one of claims 1 to 4.

6. A cosmetic comprising the powder dispersion composition according to any one of claims 1 to 4 or the emulsion composition according to claim 5.

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