Oil-in-water emulsified cosmetic

Abstract

To provide an oil-in-water emulsified cosmetic exhibiting effective skincare benefits including a moisturizing sensation and a non-sticky feeling after application, and further allowing visual recognition of cosmetic effect after use.SOLUTION: An oil-in-water emulsified cosmetic comprising the following components (A) and (B): (A) an aluminum salt; and (B) glyceryl glucoside.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an oil-in-water emulsion cosmetic. [Background technology]

[0002] Emulsion cosmetics are a formulation that has been used in cosmetics because they can efficiently spread oil-soluble active ingredients, such as emollient oils, UV absorbers, oil-soluble drugs, etc., onto the skin, and are widely used in skin care cosmetics because of their ease of use. Among them, oil-in-water emulsion cosmetics, whose continuous phase is composed of aqueous components, are characterized by light, smooth spreadability and a refreshing feel when used as cosmetics, as well as improved adhesion of the cosmetics to the skin and cosmetic durability.

[0003] In skin care cosmetics, efforts have been made to provide effects that users can visually sense during use, in addition to effective effects such as moisturizing or a non-sticky feel. For example, Patent Document 1 describes that a combination of sodium acrylate-grafted starch and starch is effective in blurring skin irregularities and concealing wrinkles. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-38180 Summary of the Invention [Problem to be solved by the invention]

[0005] The immediate and visual effect felt after applying a skin care cosmetic to the skin motivates users to continue using the skin care cosmetic, and is extremely important when considering the effects obtained by continued use of the skin care cosmetic. In particular, if the skin looks brighter after application, users can feel that their skin is healthy, which is likely to motivate them to continue using the skin care cosmetic. Conventionally, skin brightness has been achieved in many cases through makeup cosmetics, and specifically, skin brightness has been achieved by incorporating titanium oxide or the like, which has a high refractive index, into cosmetics.

[0006] Therefore, an object of the present invention is to provide an oil-in-water emulsion cosmetic that not only provides skin care effects such as moisturizing feeling and a feeling of use such as non-stickiness on the skin after use, but also provides a visual effect after use. [Means for solving the problem]

[0007] In order to achieve the above object, the oil-in-water emulsion cosmetic of the present invention has the following constitution.

[0008] 1. The following components (A) to (B); (A) Aluminum salt (B) Glyceryl glucoside An oil-in-water emulsion cosmetic comprising:

[0009] 2. The oil-in-water emulsion cosmetic according to 1., wherein the content mass ratio of the oil to component (B) is 2 or less.

[0010] 3. The oil-in-water emulsion cosmetic according to 1. or 2., wherein the content of the oil is 10% by mass or less of the oil-in-water emulsion cosmetic.

[0011] 4. The oil-in-water emulsion cosmetic according to any one of 1. to 3., further comprising component (C): a polyhydric alcohol having 5 or more carbon atoms (excluding component (B)).

[0012] 5. The oil-in-water emulsion cosmetic according to 4., wherein the polyhydric alcohol having 5 or more carbon atoms is a diol having 5 to 6 carbon atoms.

[0013] 6. The oil-in-water emulsion cosmetic according to any one of 1. to 5., which is liquid.

[0014] 7. The oil-in-water emulsion cosmetic according to any one of 1. to 6., further comprising component (D): a nonionic surfactant having an HLB of 8 to 15.

[0015] 8. The oil-in-water emulsion cosmetic according to 7., wherein the content mass ratio of component (B) to component (D) exceeds 1.

[0016] 9. The oil-in-water emulsion cosmetic according to any one of 1. to 8., wherein component (A) is at least one selected from the group consisting of aluminum chlorohydrate, aluminum chloride, aluminum sulfate, aluminum allantoin chlorohydrate, aluminum allantoin dihydroxy, aluminum bromohydrate, aluminum acetate, aluminum lactate, and aluminum potassium sulfate. [Effects of the Invention]

[0017] The oil-in-water emulsion cosmetic of the present invention not only provides effective skin care effects such as moisturizing feeling and a feeling of use such as non-stickiness on the skin after use, but also provides a visual effect such as brighter skin after use. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, embodiments of the present invention will be described. However, the present invention is not limited to only the following embodiments. In this specification, the range "X to Y" includes X and Y and means "X or more and Y or less." Furthermore, unless otherwise specified, operations and measurements of physical properties are performed under conditions of room temperature (20 to 25°C) and relative humidity of 45 to 55% RH. Furthermore, in this specification, when a certain component contains two or more types, the content of the component refers to the total amount of the two or more types.

[0019] The present invention provides an oil-in-water emulsion cosmetic (hereinafter also simply referred to as cosmetic) containing the following components (A) and (B): (A) an aluminum salt, and (B) glyceryl glucoside.

[0020] As described above, the present inventors focused on the visual effects felt immediately after application of skin care cosmetics, and conducted extensive research into methods other than those used in makeup cosmetics that incorporate high refractive index elements such as titanium oxide. They then noted that the brightness of the skin when viewed externally varies depending on the difference in refractive index between the coating film formed after application of an emulsion cosmetic and the air and skin. They discovered that combining (A) aluminum salt, (B) glyceryl glucoside, and an oil not only provides effective skin care effects such as moisturizing sensation and a feel of non-stickiness on the skin after application, but also visual effects such as skin brightness after application.

[0021] The detailed mechanism by which the oil-in-water cosmetic of the present invention exhibits the above-mentioned effects is unknown, but is thought to be as follows: Note that the following mechanism is not intended to limit the technical scope of the present invention in any way.

[0022] Component (B) has a high ability to hold onto water. Component (A) easily becomes a hydroxide on the skin due to, for example, sweat and gels. When an oil-in-water cosmetic is applied to the skin, component (A) gels while holding onto the highly water-containing component (B) and the oil present as oil droplets in the cosmetic. This forms a cosmetic film that retains a large amount of water and oil between the air and the skin, and it is thought that the moisture retention due to the moisture-occlusive properties makes the skin appear brighter.

[0023] Furthermore, since component (A) can retain component (B) on the skin, the effects of moisturizing feeling and non-stickiness are also synergistically improved.

[0024] Each component in the cosmetic will be described below.

[0025] (Component (A): Aluminum salt) Examples of aluminum salts of component (A) include aluminum chlorohydrate (chlorohydroxy Al), aluminum chloride, aluminum sulfate, allantoin chlorohydrate aluminum, allantoin dihydroxyaluminum, bromohydroxyaluminum, aluminum acetate, aluminum lactate, and aluminum potassium sulfate. Component (A) may be used alone or in combination of two or more. From the viewpoint of the effects of the present invention, the aluminum salt of component (A) is preferably at least one selected from the group consisting of aluminum chlorohydrate, aluminum chloride, and aluminum potassium sulfate, and more preferably aluminum chlorohydrate.

[0026] The content of component (A) in the cosmetic is preferably 0.0001% by mass or more, 0.0005% by mass or more, 0.001% by mass or more, 0.002% by mass or more, 0.005% by mass or more, or 0.01% by mass or more, from the viewpoints of the improvement in skin brightness obtained after use (instant brightness), non-stickiness of the skin after use, stability over time, etc. Furthermore, the content of component (A) in the cosmetic is preferably 5% by mass or less, 3% by mass or less, 2% by mass or less, 1% by mass or less, 0.5% by mass or less, or 0.4% by mass or less, from the viewpoints of stability over time, etc. The content of component (A) in the cosmetic is preferably 0.0001 to 5 mass%, 0.0005 to 3 mass%, 0.001 to 2 mass%, 0.002 to 1 mass%, 0.002 to 0.5 mass%, 0.002 to 0.4 mass%, 0.005 to 0.4 mass%, or 0.01 to 0.4 mass%.

[0027] (Component (B): Glyceryl glucoside) Glyceryl glucoside is a reaction product of glucose and glycerin, and is formed by α- or β-glucosidic bonds between glycerin and one or more glucose molecules. Typically, 1 to 3 glucose molecules are bonded to glycerin. Specific examples include (2R)-1-O-α-D-glucopyranosylglycerol, (2S)-1-O-α-D-glucopyranosylglycerol, 2-O-α-D-glucopyranosylglycerol, (2R)-1-O-β-D-glucopyranosylglycerol, (2S)-1-O-β-D-glucopyranosylglycerol, and 2-O-β-D-glucopyranosylglycerol. These may be used alone or in combination. As a cosmetic ingredient, glyceryl glucoside is the display name.

[0028] Glyceryl glucoside may be synthesized by a known production method, or a commercially available product may be used, such as αGG-L (aqueous solution of α-glyceryl glucoside, manufactured by JTS).

[0029] The content of component (B) in the cosmetic is preferably 0.1% by mass or more, 0.5% by mass or more, 1% by mass or more, 2% by mass or more, or 3% by mass or more, from the viewpoints of moisturizing feeling, non-stickiness on the skin after application, instant brightness, etc. Furthermore, the content of component (B) in the cosmetic is preferably 25% by mass or less, 20% by mass or less, 15% by mass or less, 12% by mass or less, or 10% by mass or less, from the viewpoints of stickiness on the skin after application, etc. The content of component (B) in the cosmetic is preferably 0.1 to 25% by mass, 0.5 to 20% by mass, 1 to 15% by mass, 2 to 12% by mass, or 3 to 10% by mass.

[0030] In the cosmetic, the mass ratio of the oil to component (B) is preferably 2 or less. By including component (B) and the oil in the cosmetic at such a mass ratio, the balance between water and oil in the cosmetic film formed on the skin is optimized, making it easier to achieve brighter skin. In terms of factors such as non-stickiness on the skin after application, the mass ratio of the oil to component (B) in the cosmetic is preferably 1 or less, less than 1, 0.8 or less, 0.5 or less, or 0.3 or less. Furthermore, in the cosmetic, the mass ratio of the oil to component (B) is preferably 0.01 or more, more preferably 0.05 or more, and even more preferably 0.1 or more. In the cosmetic, the mass ratio of the oil to component (B) is preferably 0.01 to 2, 0.01 to 1, 0.01 or more but less than 1, 0.01 to 0.8, 0.05 to 0.5, or 0.1 to 0.3.

[0031] In terms of the effects of the present invention, it is preferable that the content mass ratio of component (B) to component (D), which will be described in detail below, in the cosmetic preparation exceeds 1. The content mass ratio of component (B) to component (D) is preferably 1.5 to 50, more preferably 5 to 30, and even more preferably 5 to 20.

[0032] (Component (C): Polyhydric alcohol with 5 or more carbon atoms) In addition to the above components, the oil-in-water emulsion cosmetic of the present invention preferably contains a polyhydric alcohol having 5 or more carbon atoms. By containing a polyhydric alcohol having 5 or more carbon atoms, the skin does not feel sticky after application. The number of carbon atoms in the polyhydric alcohol having 5 or more carbon atoms may be 5 to 15, or 5 to 10, 5 to 8, or 5 to 6. Note that a polyhydric alcohol refers to an alcohol having two or more hydroxyl groups in the molecule. Furthermore, component (C) does not include component (B).

[0033] The polyhydric alcohol having 5 or more carbon atoms is not particularly limited, but examples thereof include pentanediols such as 1,2-pentanediol, 1,5-pentanediol, and isopentyldiol, hexanediols such as 1,2-hexanediol, octanediols such as 1,2-octanediol, and diols such as decanediol; sugar alcohols such as sorbitol, xylitol, and mannitol; diglycerin, triglycerin, dipropylene glycol, isoprene glycol, neopentyl glycol, triethylene glycol, caprylyl glycol, hexanetriol, trimethylolpropane, and polyethylene glycol.

[0034] From the viewpoint of further improving stability over time, the polyhydric alcohol having 5 or more carbon atoms is preferably a diol having 5 to 6 carbon atoms, and is preferably at least one selected from the group consisting of 1,2-pentanediol, 1,5-pentanediol, isopentyldiol, and hexanediol, more preferably at least one selected from the group consisting of 1,2-pentanediol, 1,5-pentanediol, and isopentyldiol, and even more preferably isopentyldiol.

[0035] The content of component (C) in the cosmetic is preferably 0.1 to 15% by mass, and more preferably 0.5 to 10% by mass, from the viewpoint of non-stickiness on the skin after use.

[0036] (Component (D): Nonionic surfactant with HLB of 8 to 15) In addition to the above components, the oil-in-water emulsion cosmetic of the present invention preferably contains, from the viewpoint of stability over time, a nonionic surfactant with an HLB of 8 to 15. In particular, the presence of component (A) in water promotes emulsion coalescence, which tends to reduce the stability of the oil-in-water emulsion. However, by using a nonionic surfactant with an HLB of 8 to 15, the stability over time of an oil-in-water emulsion cosmetic containing component (A) can be improved.

[0037] To obtain even better stability over time, it is preferable to contain a nonionic surfactant having an HLB of at least 8-12, and more preferably at least 8-11, as component (D).

[0038] Here, HLB (Hydphile-Lipophile Balance) in the present invention is an index showing the balance of hydrophilicity and lipophilicity, and is calculated by Oda and Teramura et al. using the following formula (1): HLB = (Σ inorganic value / Σ organic value) × 10 (Equation 1) Here, the Σ inorganic value / Σ organic value is called IOB (Inorganic-Organic balance), and can be calculated by adding up the "inorganic value" and "organic value" of the atoms and functional groups that make up an organic compound such as a surfactant, based on the "inorganic value" and "organic value" set for each type of atom and functional group (see "Organic Conceptual Diagram - Fundamentals and Applications" by Yoshio Koda, pp. 11-17, Sankyo Publishing, 1984).

[0039] Examples of nonionic surfactants having an HLB of 8 to 15 include alkylene glycol adducts of glycerin fatty acid esters; polyglyceryl fatty acid esters; alkylene glycol adducts of propylene glycol fatty acid esters; alkylene glycol adducts of sorbitan fatty acid esters such as polyoxyethylene sorbitan coconut oil fatty acid, polyoxyethylene sorbitan monooleate, polyoxyethylene sorbitan trioleate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan tristearate, and polyoxyethylene sorbitan monoisostearate; sorbit fatty acid esters such as polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan tetrastearate, and polyoxyethylene sorbitan tetraoleate. Examples of suitable nonionic surfactants include alkylene glycol adducts of sterol ethers, polyether-modified silicones, sugar fatty acid esters, polyoxyethylene hydrogenated castor oil, polyalkylene glycol fatty acid esters, polyoxyalkylene alkyl ethers, glycerin alkyl ethers, polyoxyethylene alkylphenyl ethers, alkylene glycol adducts of lanolin, alkylene glycol adducts of sterol ethers such as polyoxyethylene phytostanol ether, polyoxyethylene phytosterol ether, polyoxyethylene cholestanol ether, and polyoxyethylene cholesteryl ether, polyoxyalkylene-modified organopolysiloxanes, and triester compounds of polyoxyethylene alkyl ethers and phosphoric acid. These nonionic surfactants may be used alone or in combination of two or more.

[0040] Among these, from the viewpoint of stability over time, an embodiment in which component (D) contains at least polyoxyethylene hydrogenated castor oil is preferred. Also, from the viewpoint of stability over time, a combination of polyoxyethylene hydrogenated castor oil with a nonionic surfactant other than polyoxyethylene hydrogenated castor oil having an HLB of 8 to 15 (preferably at least one selected from the group consisting of alkylene glycol adducts of sorbitol fatty acid esters, alkylene glycol adducts of sterol ethers, and alkylene glycol adducts of stanol ethers) and / or a nonionic surfactant having an HLB of 3 or more but less than 8 is also preferred. Regarding nonionic surfactants having an HLB of 3 or more but less than 8, the contents described below also apply to this embodiment.

[0041] Examples of polyoxyethylene hydrogenated castor oil include polyoxyethylene (20) hydrogenated castor oil (commercially available products include EMALEX® HC-20 manufactured by Nippon Emulsion Co., Ltd. and NIKKOL® HCO-20 manufactured by Nikko Chemicals), polyoxyethylene (30) hydrogenated castor oil (commercially available products include EMALEX® HC-30 manufactured by Nippon Emulsion Co., Ltd. and NIKKOL® HCO-30 manufactured by Nikko Chemicals), polyoxyethylene (40) hydrogenated castor oil (commercially available products include EMALEX® HC-40 manufactured by Nippon Emulsion Co., Ltd. and NIKKOL® HCO-40 manufactured by Nikko Chemicals), and polyoxyethylene (50) hydrogenated castor oil (commercially available products include NIKKOL® HCO-50 manufactured by Nikko Chemicals). The number in parentheses indicates the number of moles of ethylene oxide added.

[0042] The content of component (D) in the cosmetic is preferably 0.01 to 5% by mass, and more preferably 0.05 to 3% by mass, from the viewpoints of stability over time, non-stickiness on the skin after use, etc. Furthermore, when polyoxyethylene hydrogenated castor oil is contained, the content of polyoxyethylene hydrogenated castor oil in the cosmetic is preferably 0.01 to 5% by mass, and more preferably 0.05 to 3% by mass.

[0043] The oil-in-water emulsion cosmetic of the present invention may be used in combination with surfactants other than component (D) (nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants). From the viewpoint of stability over time, a preferred embodiment is to combine component (D) with a nonionic surfactant having an HLB of 3 or more but less than 8. Examples of nonionic surfactants having an HLB of 3 or more but less than 8 include glycerin fatty acid esters, sorbitan fatty acid esters, sucrose fatty acid esters, fatty alcohol ethoxylates, polyoxyethylene alkylphenyl ethers, and alkylglycosides. Among these, preferred nonionic surfactants having an HLB of 3 or more but less than 8 are sorbitan fatty acid esters and glycerin fatty acid esters, with glycerin fatty acid esters being more preferred. Specific examples include glyceryl myristate (HLB value 3.5), glyceryl monostearate (HLB value 4.0), sorbitan sesquistearate (HLB value 4.0), sorbitan sesquiisostearate (HLB value 4.0), sorbitan monooleate (HLB value 4.3), and monostearic acid esters. Examples of nonionic surfactants include diglyceryl phosphate (HLB value 5.0), diglyceryl monooleate (HLB value 6.5), diglyceryl dioleate (HLB value 7.0), diglyceryl monoisostearate (HLB value 5.5), tetraglyceryl monostearate (HLB value 6.0), tetraglyceryl monooleate (HLB value 6.0), POE(5)glyceryl triisostearate (HLB value 3.0), and POE(10)glyceryl triisostearate (HLB value 5.0). These nonionic surfactants may be used alone or in combination of two or more. The content of nonionic surfactants with an HLB of 3 or more and less than 8 in the cosmetic is, for example, 0.01 to 5% by mass, and may be 0.05 to 3% by mass. The mass ratio of component (D) to component (D) is appropriately set in consideration of the effects of the present invention, and may be, for example, component (D):nonionic surfactant with HLB of 3 or more and less than 8=1:0.1 to 10, or 1:0.1 or more and less than 1.

[0044] (oil) The oil-in-water emulsion cosmetic of the present invention generally contains an oil agent.

[0045] Examples of oils include hydrocarbons such as isododecane, isohexadecane, light isoparaffin, liquid paraffin (mineral oil), squalane, squalene, α-olefin oligomer, polybutene, liquid isoparaffin, heavy liquid isoparaffin, polyisobutylene, and hydrogenated polyisobutene; animal and vegetable oils such as rapeseed oil, avocado oil, almond oil, apricot kernel oil, perilla oil, orange oil, olive oil, kiwi seed oil, grape seed oil, sesame oil, wheat germ oil, rice germ oil, rice bran oil, safflower oil, sage oil, soybean oil, tea seed oil, corn oil, rapeseed oil, evening primrose oil, camellia oil, persic oil, Job's tears oil, peanut oil, sunflower oil, sunflower seed oil, grape seed oil, meadowfoam oil, rosemary oil, jojoba oil, jojoba seed oil, macadamia nut oil, lavender oil, rosehip oil, and mink oil;Glyceryl Tri-2-Ethylhexanoate (Triethylhexanoin), Isotridecyl Isononanoate, Isononyl Isononanoate, Cetyl 2-Ethylhexanoate, Isopropyl Myristate, Isopropyl Palmitate, Isopropyl Isostearate, 2-Ethylhexyl Palmitate, Octyldodecyl Myristate, Glyceryl Trioctanoate, Caprylic / Capric Triglyceride, Glyceryl Diisostearate, Glyceryl Triisostearate, Diglyceryl Triisostearate, Decaglyceryl Decaisostearate (Polyglyceryl-10 Decaisostearate), Trimethylolpropane Triisostearate, Propylene Glycol Dicaprate, Neopentyl Glycol Dicaprate, Polyglyceryl Triisostearate, Diisostearyl Malate, Neopentyl Glycol Diethylhexanoate, Polyglyceryl-10 Decaisostearate, Pentaerythritol Tetraisostearate Esters such as tetraisostearate, pentaerythrityl tetraethylhexanoate, dipentaerythrityl pentaisostearate, dipentaerythrityl hexa(hydroxystearate / stearic acid / rosin acid), dialkyl carbonate, tritridecyl trimellitate, bisethoxydiglycol cyclohexane-1,4-dicarboxylate, dimer dilinoleyl hydrogenated rosin condensate, C12-15 alkyl benzoate, cetyl palmitate, diglyceryl tetraisostearate, ethyl oleate, ethyl linoleate, and oleyl oleate; fatty acids such as stearic acid, behenic acid, oleic acid, and isostearic acid; higher alcohols such as oleyl alcohol, 2-octyldodecanol, 2-decyltetradecanol, isostearyl alcohol, 2-hexyldecanol, stearyl alcohol, cetostearyl alcohol, behenyl alcohol, and jojoba alcohol;Dimethylpolysiloxane (dimethicone), methylhydrogenpolysiloxane, methyltrimethicone, methylphenylpolysiloxane (diphenylsiloxyphenyltrimethicone), cyclopentasiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, tetramethyltetrahydrogencyclotetrasiloxane, tetramethyltetraphenylcyclotetrasiloxane, tetramethyltetratrifluoropropylcyclotetrasiloxane, pentamethylpentatrifluoropropylcyclo Silicone oils such as pentasiloxane, polyether-modified dimethylpolysiloxane, oleyl-modified dimethylpolysiloxane, polyvinylpyrrolidone-modified dimethylpolysiloxane, and alkyl-modified dimethylpolysiloxane; fluorine-based oils such as perfluoropolyether, perfluorodecane, and perfluorooctane; lanolin derivatives such as lanolin acetate, lanolin fatty acid isopropyl, and lanolin alcohol; 2-ethylhexyl paramethoxycinnamate, ethylhexyl salicylate, 2-[4-(diethylamino)-2- UV absorbers such as hydroxybenzoyl]benzoic acid hexyl ester, methylene bisbenzotriazolyl tetramethylbutylphenol, bisethylhexyloxyphenol methoxyphenyl triazine, polysilicone-15, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine (ethylhexyl triazone); cocoa butter, shea butter, castor oil, hydrogenated castor oil, hydrogenated coconut oil, petrolatum, hydrogenated castor oil monostearate, hydrogenated castor oil monohydroxystearate Paste-like oils such as oat oil, cholesteryl hydroxystearate, dipentaerythritol fatty acid ester, N-lauroyl-L-glutamic acid di(phytosteryl·2-octyldodecyl), N-lauroyl-L-glutamic acid di(octyldodecyl / cholesteryl / behenyl), N-lauroyl-L-glutamic acid di(octyldodecyl / phytosteryl / behenyl), macadamia nut oil fatty acid phytosteryl, dimer dilinoleic acid (phytosteryl / isostearyl / cetyl / stearyl / behenyl), etc.;Examples of the oil include waxes such as paraffin wax, ceresin wax, microcrystalline wax, polyethylene wax, Fischer-Tropsch wax, beeswax, and candelilla wax; polyethylene glycol distearate, glyceryl tribehenate, cholesterol, phytosterol, stearyl-modified polysiloxane, hydrogenated oil, and palm oil. These oils may be used alone or in combination of two or more.

[0046] In one preferred embodiment, the oil contains an oil having an ester skeleton, as this leaves the skin feeling non-sticky after application.

[0047] From the viewpoints of non-stickiness on the skin after application and stability over time, the content of the oil is preferably 10% by mass or less, and more preferably 8% by mass or less, 5% by mass or less, or 3% by mass or less, relative to the oil-in-water emulsion cosmetic. From the viewpoint of instantaneous brightness, the content of the oil is preferably 0.05% by mass or more, 0.1% by mass or more, 0.5% by mass or more, or 0.8% by mass or more, relative to the cosmetic. The content of the oil is preferably 0.05 to 10% by mass, 0.1 to 8% by mass, 0.5 to 5% by mass, or 0.8 to 3% by mass.

[0048] (water) The present invention relates to an oil-in-water emulsion cosmetic, which contains water. The water is used as a dispersion medium, and examples thereof include, but are not limited to, purified water, distilled water, ion-exchanged water, tap water, hot spring water, and deep-sea water.

[0049] The content of water in the cosmetic is not particularly limited, but is, for example, 50 to 98% by mass.

[0050] In addition to the essential components described above, other additives may be added to the oil-in-water emulsion cosmetic of the present invention. Examples of other additives include water-soluble polymers, lower alcohols, polyhydric alcohols other than component (C), amino acids, preservatives, chelating agents, cosmetic ingredients, and the like, which may be appropriately added within a range that does not impair the effects of the present invention. The oil-in-water emulsion cosmetic of the present invention may or may not contain powder, but from the perspective of the effects of the present invention, an embodiment that is substantially free of powder is a preferred embodiment. For example, the powder content in the cosmetic may be 1% by mass or less, 0.5% by mass or less, 0.3% by mass or less, 0.1% by mass or less, or 0% by mass.

[0051] (oil-in-water emulsion cosmetics) In view of the effects of the present invention, the oil-in-water emulsion cosmetic of the present invention is preferably used as a skin care cosmetic such as a lotion, emulsion, serum, or sunscreen. In particular, in view of the effects of the present invention, particularly in view of suppressing stickiness, the oil-in-water emulsion cosmetic of the present invention is preferably liquid at 25°C. In this specification, "liquid at 25°C" means a state that has fluidity at 25°C. Specifically, this refers to a viscosity measured at 25°C using a Brookfield rotational viscometer of, for example, 10,000 mPa·s or less, preferably 5,000 mPa·s or less, and more preferably 2,000 mPa·s or less.

[0052] The oil-in-water emulsion cosmetic of the present invention preferably has a pH of 3.5 to 6.0. A pH in this range allows component (A) to exist stably in the system. If the above pH is achieved by adding an aluminum salt, no special pH adjuster is required, but a pH adjuster may be added to adjust the pH to the above range.

[0053] From the viewpoint of stability over time, the average particle size of the emulsion particles in the oil-in-water emulsion cosmetic is preferably 600 nm or less, and may be, for example, 100 to 500 nm. Such fine emulsion particles can be obtained, for example, by a phase inversion temperature emulsification method, as described below. Therefore, a preferred embodiment of the present invention is an oil-in-water emulsion cosmetic obtained by the phase inversion temperature emulsification method.

[0054] (Manufacturing method) The oil-in-water emulsion cosmetic of the present invention can be produced by any known emulsification method without any particular limitation. Specific examples include dispersion emulsification, phase inversion emulsification, and phase inversion temperature emulsification. Among these, phase inversion temperature emulsification is preferred because it produces emulsions with small emulsion droplets and ensures stability. In phase inversion temperature emulsification, emulsification is carried out at a temperature above the phase inversion temperature (PIT) (the temperature at which the hydrophilic and lipophilic properties of the emulsifier(s) reach equilibrium). This reduces interfacial tension as the temperature passes through the phase inversion temperature, enabling fine emulsification without the application of strong mechanical force. A more specific example of a preferred production method is one in which the oil and component (D), and optionally other oily components, are heated and mixed, then heated to above the phase inversion temperature, and heated water (and components (A) and (B)) is added and mixed to emulsify, followed by cooling. [Example]

[0055] The effects of the present invention will be explained using the following examples and comparative examples. In the examples, the terms "parts" or "%" may be used, but unless otherwise specified, they represent "parts by mass" or "% by mass." Unless otherwise specified, each operation is performed at room temperature (25°C). In the following examples, the "remaining amount" in the content (% by mass) means the amount that adds up to 100% by mass. In all of the following examples, the viscosity measured at 25°C using a Brookfield rotational viscometer was 2000 mPa·s or less, and the pH was 3.5 to 6.0.

[0056] Examples 1 to 12 and Comparative Examples 1 to 3: Toners (oil-in-water type) having the formulations shown in Tables 1 and 2 below were prepared.

[0057] (Manufacturing method) (1)(Manufacturing method) A: Components (1) to (6) were heated to 75°C and dissolved uniformly. B: Components (7) to (11) were heated to 75°C. C: B was added to A at 75°C and emulsified, then cooled to room temperature with stirring to obtain a lotion.

[0058] Evaluation method 1: Immediate brightness after application A panel of 20 expert cosmetic evaluation members applied each cosmetic product to the entire face, checked the immediate brightness after application, and rated and scored it using the five-point scale below. The average score was calculated from the total scores of all panelists for each cosmetic product, and judged using the four-point scale below.

[0059] <Absolute evaluation criteria> (Rating): (Evaluation) 5 points: Feels bright 4 points: Somewhat bright 3 points: Neither 2 points: Not very bright 1 point: No sense of brightness <4-level evaluation criteria> (Judgment): (Average score) ◎: Over 4.5 points: Very good ○: Over 3.5 points, 4.5 points or less: Good △: Over 1.5 points, 3.5 points or less: Slightly poor ×: 1.5 points or less: Defective.

[0060] Evaluation method 2: Moisturizing sensation A panel of 20 expert cosmetic evaluation members applied each cosmetic product to the entire face, checked the moisturizing sensation after application, and rated and scored using the five-point scale below. The average score was calculated from the total scores of all panelists for each cosmetic product, and the results were judged using the four-point scale below.

[0061] <Absolute evaluation criteria> (Rating): (Evaluation) 5 points: Feels moisturizing 4 points: Slightly moisturizing 3 points: Neither 2 points: Not very moisturizing 1 point: No moisturizing sensation <4-level evaluation criteria> (Judgment): (Average score) ◎: Over 4.5 points: Very good ○: Over 3.5 points, 4.5 points or less: Good △: Over 1.5 points, 3.5 points or less: Slightly poor ×: 1.5 points or less: Defective.

[0062] Evaluation method 3: Lack of stickiness on skin after application A panel of 20 expert cosmetic evaluation members applied each cosmetic product to the entire face, checked for stickiness after application, and rated and scored using the five-point scale below. The average score for each cosmetic product was calculated from the total scores of all panelists, and judged using the five-point scale below.

[0063] <Absolute evaluation criteria> (Rating): (Evaluation) 5 points: Skin does not feel sticky after use 4 points: Not too sticky on the skin after use 3 points: Neither 2 points: Skin feels slightly sticky after use 1 point: Sticky skin <5-level evaluation criteria> (Judgment): (Average score) 5: Over 4.5 points: Very good 4: Over 3.5 points and below 4.5 points: Good 3: Over 2.5 points and under 3.5 points: Fairly good 2: Over 1.5 points, 2.5 points or less: Slightly poor 1: 1.5 points or less: Defective.

[0064] Evaluation method 4: Stability over time Each sample was placed in a thermostatic bath at 50°C, and after one month, the appearance (degree of uniformity of emulsion) was visually observed and rated according to the following criteria.

[0065] <Judgment criteria> (Judgment): (Evaluation) ◎: No creaming at all (the emulsion is uniform and even in consistency) ○: Very slight creaming △: Quite creamy ×: Significant creaming.

[0066] The results of each evaluation method are shown in Tables 1 and 2.

[0067] [Table 1]

[0068] [Table 2]

[0069] (*1) HCO-20 (Nikko Chemicals) (*2) Poem V-100 (Riken Vitamin Co., Ltd.) (*3) NIKKOL GO-430NV (Nikko Chemicals) (*4) CARNATION (manufactured by Sonnenborn LLC) (*5) Aluminum hydroxychloride (powder) (Clariant Japan) From the above results, the oil-in-water lotions of Examples 1 to 12 provided skin care effects such as moisturizing sensation, a feeling of use such as non-stickiness on the skin after application, and also provided a visual effect of making the skin appear brighter after application. They also had good stability over time. On the other hand, Comparative Example 1, which did not contain chlorohydroxyaluminum, failed to provide immediate brightness after application. Comparative Example 2, which did not contain glyceryl glucoside, significantly reduced the moisturizing sensation and also did not provide sufficient immediate brightness after application. Comparative Example 3, which contained glycerin instead of glyceryl glucoside, significantly reduced the non-stickiness on the skin after application and also did not provide sufficient immediate brightness after application.

[0070] Example 13: Liquid beauty serum (oil-in-water type) (Component) (%) 1 Polyoxyethylene hydrogenated castor oil *1 (ingredient (D)) 0.5 2 Glyceryl stearate *2 0.3 3 Polyoxyethylene cholesteryl ether *6 (ingredient (D)) 0.1 4 Octyldodecanol 0.5 5 d-δ-tocopherol 0.1 6 Triethylhexanoin 0.1 7 Squalane 0.5 8 Jojoba oil 0.5 9 Purified water remaining 10 Hydroxypropyl methylcellulose 0.01 11 Chlorohydroxy Al *5 (Component (A)) 0.05 12 1,3-butylene glycol 15 13 Glyceryl glucoside (ingredient (B)) 7 14 Glycerin 1 15 Diglycerin (ingredient (C)) 1 16 Isopentyldiol (component (C)) 1 17 Sorbitol (Component (C)) 1 18 Dipropylene glycol (ingredient (C)) 1 19 L-Ascorbic acid 2-glucoside 0.1 20 PEG-400 (Component (C)) 0.1 21 Glycosyltrehalose 0.2 22 Hydrogenated starch hydrolysate 0.2 23 Propylene Glycol 0.1 24 Glycereth-26 0.5 25 Ethanol 10 26 Disodium edetate 0.01 27 Gentian extract, hydrolyzed silk liquid, hydrolyzed rice extract, seaweed extract, Saccharomyces cerevisiae extract, pomegranate fruit extract, pomegranate peel extract, tallow fruit extract, parsley extract, royal jelly extract, avocado extract, gynostemma pentaphyllum extract, barberry fruit extract, apple extract, lemongrass extract, citric acid extract, asparagus extract, guava extract, coffee extract, ginseng extract, grape leaf extract, burnet extract, L-serine, Iwashiorkoromo (Cornflower) leaf extract, Artemisia capillaris flower extract, Alpinia speciosa leaf extract, Eggplant fruit extract, guava extract, cornflower flower water, tallow tea extract, Centella asiatica leaf extract, and grape leaf extract mixture 1 (*6) EMALEX CS-24 (Nikko Chemicals, HLB13) (Manufacturing method) A: Components (1) to (8) were heated to 75°C and dissolved uniformly. B: Components (9) to (11) were heated to 75°C. C: Components (12) to (27) were dissolved uniformly. D: B was added to A at 75°C and emulsified, then cooled to 35°C. E: C was added to D and stirred to obtain a liquid beauty serum.

[0071] The liquid beauty serum obtained in this manner was excellent in immediate brightness, moisturizing properties, non-stickiness on the skin after application, and stability over time.

[0072] Example 14: Cloudy lotion (oil-in-water type) (Component) (%) 1 Polyoxyethylene hydrogenated castor oil *1 (ingredient (D)) 0.5 2 Polyoxyethylene sorbitol tetraoleate *3 (ingredient (D)) 0.3 3 Trimethylolpropane triisostearate 0.5 4 Triethylhexanoin 0.5 5 Ethyl oleate 0.1 6 Liquid paraffin 0.1 7 Purified water remaining 8. Chlorohydroxyaluminum (component (A)) 0.05 9 1,3-butylene glycol 15 10 Glyceryl glucoside (ingredient (B)) 7 11 Glycerin 1 12 Diglycerin (ingredient (C)) 1 13 Isopentyldiol (component (C)) 1 14 Sorbitol (Component (C)) 1 15 Dipropylene glycol (component (C)) 1 16 L-Ascorbic Acid 2-Glucoside 0.1 17 PEG-400 (component (C)) 0.1 18 Glycosyltrehalose 0.2 19 Hydrogenated starch hydrolysate 0.2 20 Propylene Glycol 0.1 21 Glycereth-26 0.5 22 Ethanol 10 23 Disodium edetate 0.1 24 Tocopheryl acetate, water-soluble collagen, royal jelly extract, angelica root extract, rosa centifolia flower extract, damask rose flower water, rosemary leaf extract, acerola fruit extract, acetyl glutamic acid, theanine, glycine, citric acid, guava extract, hydrolyzed hyaluronic acid, and sodium hyaluronate mixture 1 (Manufacturing method) A: Components (1) to (6) were heated to 75°C and dissolved uniformly. B: Components (7) and (8) were heated to 75°C. C: Components (9) to (24) were dissolved uniformly. D: B was added to A at 75°C and emulsified, then cooled to 35°C. E: C was added to D and stirred to obtain a lotion.

[0073] The lotion obtained in this manner was excellent in immediate brightness, moisturizing properties, non-stickiness on the skin after application, and stability over time.

Claims

1. The following components (A) to (B): (A) Aluminum salt (B) Glyceryl glucoside An oil-in-water emulsion cosmetic comprising:

2. 2. The oil-in-water emulsion cosmetic according to claim 1, wherein the content mass ratio of the oil to the component (B) is 2 or less.

3. 3. The oil-in-water emulsion cosmetic according to claim 1, wherein the content of the oil is 10% by mass or less based on the oil-in-water emulsion cosmetic.

4. 3. The oil-in-water emulsion cosmetic according to claim 1, further comprising component (C): a polyhydric alcohol having 5 or more carbon atoms (excluding component (B)).

5. The oil-in-water emulsion cosmetic according to claim 4, wherein the polyhydric alcohol having 5 or more carbon atoms is a diol having 5 to 6 carbon atoms.

6. The oil-in-water emulsion cosmetic according to claim 1 or 2, which is in a liquid form.

7. 3. The oil-in-water emulsion cosmetic according to claim 1, further comprising component (D): a nonionic surfactant having an HLB of 8 to 15.

8. 8. The oil-in-water emulsion cosmetic according to claim 7, wherein the content mass ratio of said component (B) to said component (D) exceeds 1.

9. 3. The oil-in-water emulsion cosmetic according to claim 1, wherein the component (A) is at least one selected from the group consisting of aluminum chlorohydrate, aluminum chloride, aluminum sulfate, aluminum allantoin chlorohydrate, aluminum allantoin dihydroxy, aluminum bromohydrate, aluminum acetate, aluminum lactate, and aluminum potassium sulfate.

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