Oil-in-water emulsified cosmetic

Abstract

To provide an oil-in-water emulsified cosmetic that is producible without addition of a water-soluble polymer for stabilization or employment of special emulsification apparatus, and also to provide an oil-in-water emulsified cosmetic that yields emulsified particles of 100 nm and maintains a homogeneous, stable state over a wide temperature range for a long time even under low viscosity conditions.SOLUTION: An oil-in-water emulsified cosmetic comprises (a) sodium dilauroyl glutamate lysine, (b) polyglyceryl-10 diisostearate, (c) glycerin, (d) an oily component, and (e) water, the emulsified particle size being adjusted to 100 nm or less.SELECTED DRAWING: None

Description

[Technical Field]

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

[0002] In recent years, cosmetics that have excellent moisturizing effects and a refreshing, non-sticky feel have become popular. Emulsion cosmetics and cosmetics containing oily ingredients have been proposed as such cosmetics. Emulsion cosmetics contain emulsion particles formed by emulsifying oily ingredients and have excellent moisturizing effects and emollient effects that soften the skin. Furthermore, by incorporating oily ingredients, cosmetics can be produced by combining oil-soluble active ingredients that are usually difficult to incorporate into aqueous phases.

[0003] Emulsion cosmetics are generally emulsified by blending an active agent and an oily component. However, cosmetics obtained by blending an active agent and an oily component, particularly low-viscosity emulsion cosmetics, are thermodynamically unstable and tend to separate over time, making it difficult to maintain long-term stability.

[0004] Therefore, in order to ensure stability, attempts have been made to increase the viscosity of the solution and suppress separation by blending a water-soluble polymer into the cosmetic, or to achieve a stable cosmetic even with a low viscosity by setting the emulsion particle size of the cosmetic to 100 nm or less.

[0005] For example, it has been proposed that a translucent oil-in-water emulsion cosmetic can be obtained by using a high-pressure emulsifier to turn squalane into emulsified particles of 100 nm or less (see Patent Document 1).

[0006] It has also been proposed to obtain a translucent cosmetic product consisting of an oil-in-water cosmetic product containing emulsified particles with an average particle size of approximately 20 nm to 3 μm by blending low-viscosity diisostearyl malate with hardened castor oil (hydrogenated castor oil), which is a nonionic surfactant (see Patent Document 2).

[0007] Furthermore, it has been proposed that a cosmetic preparation that is stable even when the internal phase ratio is as high as 25 to 45% by mass can be obtained by using a specific polyglycerol fatty acid ester in combination with an ionic surfactant (see Patent Document 3). [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-107932 [Patent Document 2] Japanese Patent Publication No. 2020-002102 [Patent Document 3] Japanese Patent Application Publication No. 2023-008460 Summary of the Invention [Problem to be solved by the invention]

[0009] In emulsion cosmetics, generally, when the emulsion particle size in the cosmetic solution is 100 nm or less, the cosmetic appears transparent to translucent. Cosmetics with such fine emulsion particle sizes have high added value in appearance, such as the ability to create a luxurious feel, and are advantageous in terms of sales strategy because they leave a good impression on consumers. Furthermore, reducing the dispersed particle size of oily active ingredients contained in emulsion cosmetics is desirable because it may increase the skin penetration of the active ingredients.

[0010] However, the emulsified cosmetics proposed in Patent Documents 1 to 3 require special equipment that enables high-pressure emulsification during their manufacturing process, which limits the equipment available. Furthermore, if a high-pressure emulsifier is not used, a combination of specific multiple types of surfactants or specific oily components is required, resulting in formulation limitations. Furthermore, it has become clear that even if emulsion particles of 100 nm or less are obtained, depending on the combination of surfactants and oily agents, stability over time may not be guaranteed.

[0011] Therefore, a new method for obtaining cosmetics containing emulsion particles of 100 nm or less that are stable for a longer period without using special manufacturing equipment has been sought.

[0012] The present invention aims to provide an oil-in-water emulsion cosmetic that can be produced without incorporating a water-soluble polymer for stabilization or using special emulsification equipment. Furthermore, the present invention aims to provide an oil-in-water emulsion cosmetic that can produce emulsion particles of 100 nm using a previously unknown combination, and that maintains a stable, uniform state over a wide temperature range even at low viscosity for long periods of time. [Means for solving the problem]

[0013] As a result of extensive research, the present inventors have newly discovered that by blending polyglyceryl-10 diisostearate, glycerin, sodium lysine dilauroyl glutamate, and water into a cosmetic solution, it is possible to obtain a low-viscosity oil-in-water emulsion cosmetic that is stable over time and contains very uniform emulsified particles of 100 nm or less, and this has led to the completion of the present invention.

[0014] That is, the first means of the present invention for solving the above problems is: (a) Sodium lysine dilauramidoglutamate (b) Polyglyceryl-10 Isostearate (c) Glycerin (d) Oily component (e) water The oil-in-water emulsion cosmetic contains

[0015] A second aspect of the present invention for solving the above problems is the oil-in-water emulsion cosmetic according to the first aspect of the present invention, characterized in that the blending amount of component (a) is 0.01 to 2.0 mass%, the blending amount of component (b) is 0.01 to 20.0 mass%, the blending amount of component (c) is 0.01 to 30.0 mass%, and the blending amount of component (d) is 0.01 to 20.0 mass%.

[0016] The third aspect of the present invention for solving the above problems is the oil-in-water emulsion cosmetic according to the first or second aspect of the present invention, which can be prepared by dissolving any poorly soluble component. [Effects of the Invention]

[0017] According to the present invention, it is possible to produce the composition without blending a water-soluble polymer for stabilization and without using special equipment.

[0018] Furthermore, according to the present invention, by forming oily components into emulsified particles of 100 nm or less, it has become possible to obtain an oil-in-water emulsion cosmetic that maintains a stable, uniform state over a wide temperature range for a long period of time, even with low viscosity. DETAILED DESCRIPTION OF THE INVENTION

[0019] The following describes embodiments of the present invention. However, the present invention is not limited to these examples, and various modifications can be made without departing from the spirit of the present invention.

[0020] The sodium dilauroyl glutamate lysine used in the present invention is classified as a gemini ionic surfactant. Sodium dilauroyl glutamate lysine solutions are commercially available, and such commercial products can be purchased and used. An example of such a commercial product is "Pellicer (registered trademark) L-30" (Asahi Kasei Finechem Co., Ltd., Japan).

[0021] The amount of sodium lysine dilauramidoglutamate used in the present invention is preferably 0.001% to 2.0% by mass, more preferably 0.01% to 1.5% by mass. Specific examples of the amount of sodium lysine dilauramidoglutamate include 0.001%, 0.003%, 0.005%, 0.007%, 0.01%, 0.03%, 0.05%, 0.07%, 0.1%, 0.3%, 0.5%, 0.7%, 1.0%, 1.3%, 1.5%, 1.7%, and 2.0% by mass, and may be within a range between any two of these values. If the amount of such a component is too high or too low, the aforementioned effects may not be achieved, or problems may arise in terms of the stability of the oil-in-water emulsion cosmetic.

[0022] The polyglyceryl-10 diisostearate used in the present invention is classified as a hydrophilic surfactant. Some commercially available products are available, and these can be purchased and used. Examples of such commercially available products include "EMALEX DISG-10" (Nihon Emulsion Co., Ltd., Japan), "NIKKOL Decaglyn 2-ISV" (Nikko Chemicals Co., Ltd., Japan), "S Face IS-1002P" (Sakamoto Pharmaceutical Co., Ltd., Japan), "Sunsoft Q-192Y-C" (Taiyo Kagaku Co., Ltd., Japan), and "Matsunate MI-102" (Matsumoto Fine Chemical Co., Ltd., Japan).

[0023] The blending amount of polyglyceryl-10 diisostearate used in the present invention is preferably 0.01% by mass to 20.0% by mass, more preferably 0.1% by mass to 16.67% by mass. Specifically, the amount of polyglyceryl-10 diisostearate blended is 0.01% by mass, 0.02% by mass, 0.03% by mass, 0.04% by mass, 0.05% by mass, 0.06% by mass, 0.07% by mass, 0.08% by mass, 0.09% by mass, 0.1% by mass, 0.2% by mass, 0.3% by mass, 0.5% by mass, 0.7% by mass, 1.0% by mass, 3.0% by mass, 5.0% by mass, 7.0% by mass, 10.0% by mass, 13.0% by mass, 15.0% by mass, 16.0% by mass, 16.67% by mass, 17.0% by mass, 18.0% by mass, 19.0% by mass, 20.0% by mass, and may be within a range between any two of these values. If the amount of such a component is too large, the oil-in-water emulsion cosmetic will have a strong oily feel and will have a poor feel when used, whereas if the amount is too small, the above-mentioned effects may not be obtained.

[0024] The blending amount of glycerin used in the present invention is preferably 0.01% by mass to 30.0% by mass, more preferably 0.17% by mass to 28.33% by mass, specifically 0.01%, 0.03%, 0.05%, 0.07%, 0.1%, 0.15%, 0.17%, 0.2%, 0.3%, 0.5%, 0.7%, 1.0%, 3.0%, 5.0%, 7.0%, 10.0%, 13.0%, 15.0%, 20.0%, 25.0%, 28.0%, 28.33%, 29.0%, 30.0% by mass, or within a range between any two of these values. If the amount of such a component is too large or too small, the above-mentioned effects may not be obtained, or problems may arise in terms of the stability of the oil-in-water emulsion cosmetic.

[0025] The oily component used in the present invention is a component that constitutes the oil phase of the oil-in-water emulsion cosmetic according to the present disclosure. Oils commonly used in cosmetics, quasi-drugs, and the like can be used as the oily component. Examples of such oils include hydrocarbon oils, higher fatty acids, higher alcohols, synthetic ester oils, silicone oils, and liquid oils. Oil-soluble components commonly used in cosmetics, quasi-drugs, and the like can also be included. Examples of such components include fragrances and oil-soluble UV absorbers.

[0026] Examples of the hydrocarbon oil include isododecane, isohexadecane, isoparaffin, liquid paraffin, ozokerite, squalane, pristane, paraffin, ceresin, squalene, petrolatum, and microcrystalline wax.

[0027] Examples of the higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, undecylenic acid, tall acid, isostearic acid, linoleic acid, linolenic acid, eicosapentaenoic acid, and docosahexaenoic acid.

[0028] Examples of the higher alcohols include straight-chain alcohols (e.g., lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, cetostearyl alcohol, etc.), branched-chain alcohols (e.g., monostearyl glycerin ether (batyl alcohol)-2-decyltetradecinol, lanolin alcohol, cholesterol, phytosterol, hexyldodecanol, isostearyl alcohol, octyldodecanol, etc.), and the like.

[0029] Examples of the synthetic ester oils include isononyl isononanoate, octyl octanoate, nonyl nonanoate, cetyl octanoate, isopropyl myristate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid esters, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, tripropylene glycol pivalate, diisostearyl malate, glycerin di-2-heptylundecanoate, glycerin diisostearate, trimethylolpropane tri-2-ethylhexanoate, triisostearate Trimethylolpropane, pentaerythritol tetra-2-ethylhexanoate, glycerin tri-2-ethylhexanoate, glycerin trioctanoate, glycerin triisopalmitate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate-2-ethylhexyl palmitate, glycerin trimyristate, tri-2-heptylundecanoic acid glyceride, castor oil fatty acid methyl ester, oleyl oleate, acetonitrile Examples of suitable glycerides include glycerin, 2-heptylundecyl palmitate, diisobutyl adipate, N-lauroyl-L-glutamic acid-2-octyldodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, and triethyl citrate.

[0030] Examples of the silicone oil include linear polysiloxanes (e.g., dimethylpolysiloxane, methylphenylpolysiloxane, diphenylpolysiloxane, etc.), cyclic polysiloxanes (e.g., octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, etc.), silicone resins that form a three-dimensional network structure, silicone rubber, various modified polysiloxanes (amino-modified polysiloxane, polyether-modified polysiloxane, alkyl-modified polysiloxane, fluorine-modified polysiloxane, etc.), and acrylic silicones.

[0031] Examples of the liquid oils and fats include avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, persic oil, wheat germ oil, camellia oil, castor oil, linseed oil, safflower oil, cottonseed oil, perilla oil, soybean oil, peanut oil, tea seed oil, Japanese kaya oil, rice bran oil, Chinese tung oil, Japanese tung oil, jojoba oil, germ oil, and triglycerin.

[0032] The fragrance may be, but is not limited to, a natural fragrance obtained from animals or plants, a synthetic fragrance produced by chemical synthesis, or a compound fragrance which is a mixture thereof. By blending a fragrance, a cosmetic product with excellent fragrance longevity can be obtained.

[0033] Specific examples of the fragrances include acetivenol, anisaldehyde, anethole, amyl acetate, amyl salicylate, allyl amyl glycolate, allyl caproate, aldehydes C6-20, ambrettelide, ambroxan, ionone, isoe super, eugenol, auranthiol, galaxolide, calone, coumarin, geraniol, geranyl acetate, sandalore, santalol, sandera, cyclamen aldehyde, cis-3-hexenyl acetate, cis-3-hexenol, citral, citronellol ... Neryl acetate, citronellol, cineole, dihydromyrcenol, jasmolactone, cinnamic alcohol, cinnamic aldehyde, styrallyl acetate, cedryl acetate, cedrol, damascone, damascenone, decalactone, terpinyl acetate, terpineol, tonalid, triplal, nerol, bacdanol, vanillin, hydroxycitronellal, phenylethyl acetate, phenylethyl alcohol, hexyl salicylate, vetiveryl acetate, hedione, heliotropin, helional , Vertfix, Benzyl Acetate, Benzyl Salicylate, Benzyl Benzoate, Pentalid, Pentalid, Bornyl Acetate, Myall, Musk Ketone, Methyl Anthranilate, Methyl Dihydrojasmonate, Yara Yara, Lime Oxide, Linalyl Acetate, Linalool, Limonene, Lyral, Lilial, Rose Oxide, Rhodinol, Angelica Oil, Anise Oil, Armoise Oil, Basil Oil, Bay Oil, Bergamot Oil, Calamus Oil, Camphor Oil, Cananga Oil, Cardamom Oil, Cassia oil, cedarwood oil, celery oil, chamomile oil, cinnamon oil, clove oil, coriander oil, cumin oil, dill oil, elemi oil, estragon oil, eucalyptus oil, fennel oil, fenugreek oil, galbanum oil, geranium oil, ginger oil, grapefruit oil, guaiac wood oil, cypress oil, cypress oil, juniper berry oil, lavandin oil, lavender oil, lemon oil, lime oil, mandarin oil, ziram oil, fir oil,Peppermint oil, spearmint oil, mill oil, myrtle oil, nutmeg oil, oakmoss oil, olibanum oil, opoponax oil, orange oil, parsley oil, patchouli oil, pepper oil, perilla oil, petitgrain oil, neroli oil, orange flower oil, pimento oil, allspice oil, pine oil, rose oil, rosemary oil, clary sage oil, sage oil, sandalwood oil, styrax oil, tagetes oil, thyme oil, tuberose oil, valerian oil, vetiver oil, violet leaf oil, wintergreen oil, wormwood oil, ylang-ylang oil, yuzu oil, cassie absolute, genée absolute, hyacinth absolute, inmortelle absolute, jasmine absolute, jonquil absolute, narcissus absolute, rose absolute, violet leaf absolute, benbenzoin, etc.

[0034] Examples of the oil-soluble ultraviolet absorber include benzoic acid-based ultraviolet absorbers such as para-aminobenzoic acid (PABA), PABA monoglycerin ester, N,N-dipropoxy PABA ethyl ester, N,N-diethoxy PABA ethyl ester, N,N-dimethyl PABA ethyl ester, and N,N-dimethyl PABA butyl ester; anthranilic acid-based ultraviolet absorbers such as homomenthyl-N-acetylanthranilate; amyl salicylate, menthyl salicylate, homomenthyl salicylate, and octyl salicylate; Salicylic acid-based ultraviolet absorbers such as ethyl salicylate, phenyl salicylate, benzyl salicylate, and p-isopropanol phenyl salicylate; octyl cinnamate, ethyl 4-isopropyl cinnamate, methyl 2,5-diisopropyl cinnamate, ethyl 2,4-diisopropyl cinnamate, methyl 2,4-diisopropyl cinnamate, propyl p-methoxycinnamate, isopropyl p-methoxycinnamate, isoamyl p-methoxycinnamate, octyl Cinnamic acids such as p-methoxycinnamate, 2-ethylhexyl-p-methoxycinnamate, 2-ethoxyethyl-p-methoxycinnamate, cyclohexyl-p-methoxycinnamate, ethyl-α-cyano-β-phenylcinnamate, 2-ethylhexyl-α-cyano-β-phenylcinnamate, glyceryl mono-2-ethylhexanoyl-di-paramethoxycinnamate, and 3,4,5-trimethoxycinnamate 3-methyl-4-[methylbis(trimethylsiloxy)silyl]butyl UV absorbers such as 2-phenyl-5-methylbenzoxazole, 2,2'-hydroxy-5-methylphenylbenzotriazole, 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole, 2-(2'-hydroxy-5'-methylphenylbenzotriazole, dibenzalazine, dianisoylmethane, 4-methoxy-4'-t-butyldibenzoylmethane, 5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one, and octocrylene.

[0035] The blending amount of the oily component used in the present invention is preferably 0.01% by mass to 20.0% by mass, and more preferably 0.1% by mass to 16.67% by mass. Specifically, the blend amount of such oily components is 0.01% by mass, 0.02% by mass, 0.03% by mass, 0.04% by mass, 0.05% by mass, 0.06% by mass, 0.07% by mass, 0.08% by mass, 0.09% by mass, 0.1% by mass, 0.2% by mass, 0.3% by mass, 0.4% by mass, 0.5% by mass, 0.7% by mass, 1.0% by mass, 3.0% by mass, 5.0% by mass, 7.0% by mass, 10.0% by mass, 13.0% by mass, 15.0% by mass, 16.0% by mass, 16.67% by mass, 17.0% by mass, 18.0% by mass, 19.0% by mass, or 20.0% by mass, or may be within a range between any two of these values. If the amount of such components is too high, there may be concerns about the stability of the oil-in-water emulsion cosmetic, and if the amount is too low, the above-mentioned effects may not be exhibited.

[0036] The water used in the present invention constitutes the continuous phase of the cosmetic preparation disclosed in the present invention. The water is not particularly limited, and examples thereof include purified water, ion-exchanged water, tap water, etc.

[0037] The term "slightly soluble ingredient" as used in the present invention refers to an ingredient used in cosmetics and the like that falls under the categories of "slightly soluble," "extremely soluble," and "practically insoluble" as defined in the Japanese Pharmacopoeia, preferably "extremely soluble" and "practically insoluble," and more preferably "practically insoluble." Expressed in terms of solubility, the poorly water-soluble functional ingredient has a solubility in water at 20°C of 10 mg / mL or less, preferably 1 mg / mL or less, and more preferably 0.1 mg / mL or less.

[0038] Examples of such poorly soluble components include sphingolipids including phytosphingosine, glycerin ester-based oils, fibrous proteins (such as collagen and elastin), coenzyme Q10, curcumin, tocotrienols, carotenoids (such as α-carotene, β-carotene, lutein, lycopene, astaxanthin, zeaxanthin, cryptoxanthin, fucoxanthin, and xanthophylls), resveratrol, docosahexaenoic acid (DHA), eicosapentaenoic acid (EPA), fat-soluble vitamins (vitamin A, vitamin D, vitamin E (tocopherol)), vitamin K and derivatives thereof, sesamin, α-lipoic acid, ferulic acid, and oryzanol. These components may be used alone or in combination of two or more.

[0039] The method for producing the oil-in-water emulsion cosmetic of the present invention is not particularly limited, and it can be produced according to a method for producing ordinary cosmetics.

[0040] The amount of the cosmetic of the present invention to be applied to the skin and the method of use are not particularly limited, and it can usually be used by applying an appropriate amount several times a day.

[0041] The aqueous cosmetic composition of the present invention can be used in, for example, skin care products, hair products, makeup products, UV protection products, etc., but is not limited to these.

[0042] The shape or form of a product using the aqueous cosmetic composition of the present invention is not particularly limited, and may be, for example, a liquid, emulsion, cream, solid, paste, gel, multi-layered, mousse, spray, or other product, but is not limited to these.

[0043] The cosmetic of the present invention may contain, as needed, one or more aqueous or oily components commonly used in the cosmetic field. Examples of such aqueous and oily components include, but are not limited to, moisturizers, water-soluble polymers, surfactants, solid, semi-solid, and liquid oils, higher alcohols, oil-soluble gelling agents, clay minerals, resins, film-forming agents, UV absorbers, powders, pigments, dyes, coloring materials, preservatives, antibacterial agents, antioxidants, salts, pH adjusters, chelating agents, fragrances, refreshing agents, antiperspirants, anti-inflammatory agents, skin activators, skin-beautifying ingredients, and various extracts. [Example]

[0044] The present invention will be further described below with reference to examples, but the present invention is not limited to these examples.

[0045] 1. Preparation of cosmetics to be used in evaluation tests As the cosmetics to be used in the evaluation tests, the cosmetics of Example 1 and Comparative Examples 1 to 8 shown in Table 1 below were prepared.

[0046] [Preparation of Cosmetics (Example 1)] The cosmetic of Example 1 was prepared according to the following procedure. 1) 5.00% by mass of isononyl isononanoate as component A1 and 5.00% by mass of polyglyceryl-10 diisostearate as component A2 were mixed. 2) 0.45% by mass of sodium lysine dilauramidoglutamate (component A9), 1.05% by mass of water (component A10), and 8.50% by mass of glycerin (component A11) were mixed. 3) While the mixture of Components A9 to A11 prepared in 2) was being stirred with a disperser, the mixture of Components A1 and A2 prepared in 1) was gradually added. 4) After further thorough stirring, the remaining component B (water) was gradually added while continuing to stir, to obtain the cosmetic material of Example 1.

[0047] [Preparation of Cosmetics (Comparative Example 1)] A cosmetic of Comparative Example 1 was prepared in the same manner as in Example 1, except that polyglyceryl-10 diisostearate (Component A2) was not blended.

[0048] [Preparation of Cosmetic (Comparative Example 2)] A cosmetic of Comparative Example 2 was prepared in the same manner as in Example 1, except that Component A9, sodium lysine dilauroyl glutamate, was not blended.

[0049] [Preparation of Cosmetic (Comparative Example 3)] A cosmetic of Comparative Example 3 was prepared in the same manner as in Example 1, except that polyglyceryl-10 diisostearate of Component A2 was replaced with polyglyceryl-2 isostearate of Component A3.

[0050] [Preparation of Cosmetic (Comparative Example 4)] A cosmetic of Comparative Example 4 was prepared in the same manner as in Example 1, except that polyglyceryl-10 diisostearate of Component A2 was replaced with polyglyceryl-10 pentaisostearate of Component A3.

[0051] [Preparation of Cosmetic (Comparative Example 5)] A cosmetic of Comparative Example 5 was prepared in the same manner as in Example 1, except that polyglyceryl-10 diisostearate of Component A2 was replaced with polyglyceryl-10 isostearate of Component A3.

[0052] [Preparation of Cosmetic (Comparative Example 6)] A cosmetic of Comparative Example 6 was prepared in the same manner as in Example 1, except that polyglyceryl-10 diisostearate of Component A2 was replaced with polyglyceryl-6 laurate of Component A3.

[0053] [Preparation of Cosmetic (Comparative Example 7)] A cosmetic of Comparative Example 7 was prepared in the same manner as in Example 1, except that polyglyceryl-10 diisostearate of Component A2 was replaced with polyglyceryl-2 diisostearate of Component A3.

[0054] [Preparation of Cosmetic (Comparative Example 8)] The cosmetic of Comparative Example 8 was prepared in the same manner as in Example 1, except that polyglyceryl-10 diisostearate of Component A2 was replaced with polyglyceryl-4 laurate of Component A3.

[0055] 2. Evaluation tests for emulsion cosmetics (appearance, emulsion particle size)

[0056] Using the cosmetics of Example 1 and Comparative Examples 1 to 8, the appearance and emulsion particle size of each cosmetic were evaluated.

[0057] 1) Evaluation of appearance The absorbance of the cosmetics of Example 1 and Comparative Examples 1 to 8 was measured using a multimode microplate reader (SpectraMax iD3, Molecular Devices, LLC., California, USA), and their appearance was evaluated. 200 μL of each of the emulsion cosmetics of Example 1 and Comparative Examples 1 to 8 was dispensed into a 96-well plate, and the absorbance at 660 nm was measured. The cosmetic appearance was evaluated based on the absorbance values ​​obtained and classified as transparent, translucent, or opaque according to the following criteria. Absorbance 0.05 or less: Transparent Absorbance 0.06 or more and less than 0.50: semi-transparent Absorbance 0.50 or more: Cloudy

[0058] 2) Emulsified particle size The emulsion particle sizes of the cosmetics of Example 1 and Comparative Examples 1 to 8 were measured using a concentrated particle size analyzer (FPAR-1000, Otsuka Electronics Co., Ltd., Japan).

[0059] 3. Results The absorbance was measured and the appearance was evaluated for the cosmetics of Example 1 and Comparative Examples 1 to 8. The evaluation results are shown in Table 1 below.

[0060] [Table 1]

[0061] It was revealed that when diisostearin polyglyceryl-10 described in Example 1 was used together with sodium lysine dilauroyl glutamate, a translucent cosmetic preparation containing emulsion particles of 100 nm or less with excellent appearance was obtained (see Table 1).

[0062] On the other hand, the cosmetic of Comparative Example 1, which did not contain polyglyceryl-10 diisostearate and contained only sodium lysine dilauroyl glutamate, failed to produce emulsified particles of 100 nm or less, and was found to be cloudy. Furthermore, the cosmetic of Comparative Example 1 was found to separate over time, making it unsuitable as a product (see Table 1).

[0063] Furthermore, in Comparative Example 2, in which diisostearin polyglyceryl-10 was blended but sodium lysine dilauroyl glutamate was not blended, the cosmetic turned into a cream when it was prepared, and it was confirmed that a low-viscosity emulsified cosmetic could not be obtained (see Table 1).

[0064] Furthermore, in the cosmetics of Comparative Examples 3 to 7, in which polyglycerol fatty acid esters with different HLBs were used instead of the polyglyceryl-10 diisostearate of Example 1, it was confirmed that emulsified particles of 100 nm or less could not be obtained in any of the cosmetics, and the emulsion cosmetics had a cloudy appearance (see Table 1).

[0065] Furthermore, in the cosmetic of Comparative Example 8, in which polyglyceryl-4 laurate was used instead of polyglyceryl-10 diisostearate in Example 1, emulsified particles of 100 nm or less were obtained, and it was confirmed that the cosmetic had a transparent appearance (see Table 1).

[0066] 4. Preparation of cosmetics to be used in evaluation tests In addition to the cosmetic of Example 1 shown in Table 1 and the cosmetic of Comparative Example 8 shown in Table 1, the cosmetic of Examples 2 to 5 shown in Table 2 were prepared by the following procedure.

[0067] [Preparation of Cosmetics (Example 2)] The cosmetic of Example 2 was prepared using the same procedure as in Example 1, except that the isononyl isononanoate of Component A1 was changed to 1.00% by mass, the polyglyceryl-10 diisostearate of Component A2 was changed to 1.00% by mass, the sodium lysine dilauroyl glutamate of Component A9 was changed to 0.09% by mass, the water of Component A10 was changed to 0.21% by mass, and the glycerin of Component A11 was changed to 1.70% by mass.

[0068] [Preparation of Cosmetics (Example 3)] The cosmetic of Example 3 was prepared using the same procedure as in Example 1, except that the isononyl isononanoate of Component A1 was changed to 0.10% by mass, the polyglyceryl-10 diisostearate of Component A2 was changed to 0.10% by mass, the sodium lysine dilauroyl glutamate of Component A9 was changed to 0.01% by mass, the water of Component A10 was changed to 0.02% by mass, and the glycerin of Component A11 was changed to 0.17% by mass.

[0069] [Preparation of Cosmetics (Example 4)] The cosmetic of Example 4 was prepared in the same manner as in Example 1, except that 5.00 mass% of isononyl isononanoate (Component A1), 5.00 mass% of polyglyceryl-10 diisostearate (Component A2), and 0.10 mass% of phytosphingosine (Component 13) were mixed and heated with stirring until the phytosphingosine was dissolved.

[0070] [Preparation of Cosmetics (Example 5)] The cosmetic of Example 5 was prepared using the same procedure as in Example 1, except that the isononyl isononanoate of Component A1 was changed to 16.67% by mass, the polyglyceryl-10 diisostearate of Component A2 was changed to 16.67% by mass, the sodium lysine dilauroyl glutamate of Component A9 was changed to 1.50% by mass, the water of Component A10 was changed to 4.50% by mass, and the glycerin of Component A11 was changed to 28.33% by mass. 5. Evaluation tests for emulsion cosmetics (appearance, emulsion particle size, stability)

[0071] Using the cosmetics of Examples 1 to 5 and Comparative Example 8, the appearance and emulsion particle size of each cosmetic were evaluated, and stability was also evaluated.

[0072] 1) Evaluation of appearance and emulsion particle size The cosmetic compositions of Examples 1 to 5 and Comparative Example 8 were evaluated for appearance and emulsion particle size using the methods described in the above sections 2.1) and 2).

[0073] 2) Stability The cosmetics of Examples 1 to 5 and Comparative Example 8 were left to stand in thermostatic chambers at -5°C, 25°C, 40°C, and 50°C, respectively, for one month, and then the appearance of each cosmetic was visually evaluated according to the following criteria. No change:○ Slight creaming: △ Obvious separation or creaming: No

[0074] 6. Results

[0075] [Table 2]

[0076] It was confirmed that the cosmetics of Examples 1 to 5 had emulsified particles of 100 nm or less.

[0077] Next, the temporal stability was evaluated for the cosmetics of Examples 1 to 5 and Comparative Example 1. As a result, it was confirmed that the cosmetics of Examples 1 to 5 were all stable over a wide temperature range. Furthermore, as is clear from the cosmetic of Example 4, it was confirmed that a cosmetic that was stable over a wide temperature range was obtained even when a poorly soluble component was blended into the emulsion particles (see Table 2).

[0078] On the other hand, in the cosmetic of Comparative Example 8, in which polyglyceryl-4 laurate was used instead of polyglyceryl-10 diisostearate of Example 1, clear separation was observed when stored at -5°C, confirming poor stability when stored at low temperatures (see Table 2). [Industrial Applicability]

[0079] The oil-in-water emulsion cosmetic of the present invention can be produced without the need for blending water-soluble polymers for stabilization or using special equipment. Furthermore, the oil-in-water emulsion cosmetic of the present invention can obtain emulsion particles of 100 nm using a previously unknown combination, and can maintain a stable, uniform state for a long period of time over a wide temperature range even with low viscosity.

Claims

1. (a) Sodium lysine dilauramidoglutamate (b) Polyglyceryl-10 diisostearate (c) glycerin (d) Oily component (e) Water and an emulsion particle size adjusted to 100 nm or less.

2. The amount of component (a) 2. The oil-in-water emulsion cosmetic according to claim 1, wherein the blending amount of component (b) is 0.01 to 2.0% by mass, the blending amount of component (b) is 0.01 to 20.0% by mass, the blending amount of component (c) is 0.01 to 30.0% by mass, and the blending amount of component (d) is 0.01 to 20.0% by mass.

3. 3. The oil-in-water emulsion cosmetic according to claim 1, which can be prepared by dissolving any slightly soluble component in component (d).

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