Oil-in-water emulsion cosmetics

Abstract

To provide an oil-in-water emulsion cosmetic with a good feeling of use.SOLUTION: An oil-in-water emulsion cosmetic comprises (A) a cyclic carboxamide derivative having a specific structure or a salt thereof, (B) a hydrophilic nonionic surfactant, (C) a water-soluble solvent, (D) oil, and (E) water. Emulsion particles comprising the component (A) and the component (B) are dispersed in an aqueous phase. The emulsion particles have an average particle size of less than 1 μm. The content of component (A) is 0.01-8 mass% relative to the total amount of the cosmetic.SELECTED DRAWING: None

Description

[Technical Field]

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

[0002] Stable oil-in-water emulsion compositions with small, uniform emulsion particles are known for use in cosmetics. For example, it has been proposed to impregnate a sheet base with the composition to produce a sheet-type cosmetic (see, for example, Patent Document 1).

[0003] On the other hand, cyclic carboxamide derivatives are known to have anti-wrinkle effects and anti-pigmentation effects, and it has been proposed to incorporate them into cosmetics and the like (Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-284950 [Patent Document 2] International Publication No. 2011 / 040496 Summary of the Invention

[0005] The inventors have found that when cyclic carboxamide derivatives are used in cosmetics, they tend to cause stickiness. Surprisingly, the inventors have found that an excellent feel during use can be achieved by using an oil-in-water cosmetic containing emulsion particles with an average particle size of less than 1 μm and a specific cyclic carboxamide derivative. The present invention is based on these findings.

[0006] According to the present invention, the following inventions are provided. [1] (A) A cyclic carboxamide derivative represented by formula (1) or a salt thereof [ka] (In the formula, R1 represents a hydrocarbon group having 1 to 6 carbon atoms which may be substituted with a hydroxyl group, or a hydrogen atom, X is -CH2- or -N(R 2 )-, where R 2 represents a hydrocarbon group having 1 to 6 carbon atoms which may be substituted with a hydroxyl group, or a hydrogen atom, and n is an integer from 1 to 3; (B) a hydrophilic nonionic surfactant, (C) a water-soluble solvent; (D) oil, and (E)Water An oil-in-water emulsion cosmetic comprising: ( D )Nari minutes The emulsion particles are dispersed in an aqueous phase, and the emulsion particles have an average particle size of less than 1 μm; and An oil-in-water emulsion cosmetic, in which the blending amount of component (A) is 0.01 to 8 mass % relative to the total amount of the cosmetic. [2] In the formula (1) of component (A), R 1 is a hydroxyalkyl group having 1 to 3 carbon atoms, X is -CH2- or -NH-, and The cosmetic according to [1], wherein n is 1. [3] The cosmetic preparation according to [1] or [2], wherein component (A) is 1-(2-hydroxyethyl)-2-imidazolidinone. [4] The cosmetic according to any one of [1] to [3], wherein the blending amount of component (A) is 0.01 to 5 mass % relative to the total amount of the cosmetic. [5] The cosmetic according to any one of [1] to [4], wherein the blending amount of component (B) is 0.01 to 3 mass % relative to the total amount of the cosmetic. [6] The cosmetic according to any one of [1] to [5], wherein the blending amount of component (D) is 3 to 30 mass % relative to the total amount of the cosmetic. [7] The cosmetic preparation according to any one of [1] to [6], which has a viscosity of 1 to 3,000 mPa·s as measured at 30°C using a B-type rotational viscometer. [8] The following steps: (I) adding a hydrophilic nonionic surfactant to an aqueous solvent, and then adding an oil component thereto to form an emulsion composition; (II) adding water to the emulsion composition to form an oil-in-water emulsion composition; and (III) A step of adding an aqueous solution containing the cyclic carboxamide derivative or a salt thereof to the oil-in-water emulsion composition to form an oil-in-water emulsion cosmetic. The method for producing a cosmetic according to any one of [1] to [7], comprising:

[0007] According to the present invention, it is possible to provide an oil-in-water emulsion cosmetic that has an excellent feel when used. In particular, it has a fresh feeling, blends well with the skin, leaves the skin feeling refreshed, and suppresses stickiness after application.

[0008] The present invention relates to an oil-in-water emulsion cosmetic (hereinafter, sometimes referred to as "cosmetic") comprising (A) a cyclic carboxamide derivative having a specific structure or a salt thereof, (B) a hydrophilic nonionic surfactant, (C) a water-soluble solvent, (D) an oil, and (E) water. In cosmetics, ( D )Nari minutes The emulsion particles are dispersed in an aqueous phase. The average particle size of the emulsion particles is less than 1 μm, preferably 0.1 μm or more and less than 1 μm, and more preferably 0.5 μm or more and less than 1 μm. The particle size of the emulsion particles can be measured using a microscope. The viscosity of the cosmetic according to the present invention is not particularly limited, but is preferably 1 to 3,000 mPa·s, and more preferably 3 to 2,500 mPa·s. The viscosity can be measured at 30°C using a B-type viscometer.

[0009] (A) Cyclic carboxamide derivative or salt thereof The cosmetic according to the present invention comprises a cyclic carboxamide derivative represented by formula (1) or a salt thereof (hereinafter sometimes referred to as component (A), the same applies to other components). [ka] During the ceremony, R 1 represents a hydrocarbon group having 1 to 6 carbon atoms which may be substituted with a hydroxyl group, or a hydrogen atom, X is -CH2- or -N(R 2 )-, where R 2 represents a hydrocarbon group having 1 to 6 carbon atoms which may be substituted with a hydroxyl group, or a hydrogen atom, and n is an integer of 1 to 3. The hydrocarbon group is not particularly limited and may be, for example, an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, a cycloalkylalkyl group, a haloalkyl group, an alkoxyalkyl group, or an alkoxycarbonylalkyl group, and is preferably an alkyl group.

[0010] In a preferred embodiment, in the formula (1) of the component (A), R 1 is a hydroxyalkyl group having 1 to 3 carbon atoms, X is -CH2- or -NH-, and n is 1. Specific examples of the cyclic carboxamide derivative represented by formula (1) include the following. [ka] Component (A) is most preferably 1-(2-hydroxyethyl)-2-imidazolidinone.

[0011] Component (A) may be a salt of the cyclic carboxamide derivative represented by formula (1). The type of salt is not particularly limited as long as it is pharmacologically acceptable, and may be an inorganic salt or an organic salt. Examples of inorganic salts include hydrochloride, sulfate, phosphate, hydrobromide, sodium salt, potassium salt, magnesium salt, calcium salt, magnesium salt, and ammonium salt. Examples of organic salts include acetate, lactate, maleate, fumarate, tartrate, methanesulfonate, p-toluenesulfonate, triethanolamine salt, and amino acid salt.

[0012] One or more types of component (A) can be blended in. The blending amount of component (A) is preferably 0.01 to 8 mass%, more preferably 0.1 to 5 mass%, and even more preferably 0.5 to 2.5 mass%, relative to the total amount of the cosmetic.

[0013] (B) Hydrophilic nonionic surfactant The cosmetic preparation according to the present invention comprises (B) a hydrophilic nonionic surfactant. Component (B) is not particularly limited as long as it is a hydrophilic nonionic surfactant commonly used in cosmetics, and examples include POE-alkyl ethers such as POE-lauryl ether, POE-oleyl ether, POE-stearyl ether, POE-behenyl ether, POE-2-octyldodecyl ether, and POE-cholestanol ether; Pluronic types such as Pluronic; POE-POP-alkyl ethers such as POE·POP-cetyl ether, POE·POP-2-decyltetradecyl ether, POE·POP-monobutyl ether, POE·POP-hydrogenated lanolin, and POE·POP-glycerin ether; and POE castor oil derivatives or hydrogenated castor oil derivatives such as POE castor oil, POE hydrogenated castor oil, POE hydrogenated castor oil monoisostearate, POE hydrogenated castor oil triisostearate, POE hydrogenated castor oil monopyroglutamic acid monoisostearate diester, and POE hydrogenated castor oil maleic acid. Preferred are hydrogenated castor oil derivatives, and more preferred are PEG-10 hydrogenated castor oil, PEG-20 hydrogenated castor oil, PEG-25 hydrogenated castor oil, PEG-30 hydrogenated castor oil, PEG-40 hydrogenated castor oil, PEG-50 hydrogenated castor oil, PEG-60 hydrogenated castor oil, PEG-80 hydrogenated castor oil, and PEG-100 hydrogenated castor oil.

[0014] One or more types of component (B) can be blended in. The blend amount of component (B) is preferably 0.01 to 3 mass %, more preferably 0.1 to 2 mass %, based on the total amount of the cosmetic.

[0015] (C) Water-soluble solvent The cosmetic preparation according to the present invention comprises a water-soluble solvent (C), which has the effect of dissolving the component (B) and efficiently orienting it at the interface with the oil phase that is subsequently added.

[0016] Examples of component (C) include lower monohydric alcohols such as ethanol, propanol, and benzyl alcohol; polyhydric alcohols such as glycerin, ethylene glycol, diethylene glycol, triethylene glycol, 2,5-hexanediol, 2,3-butylene glycol, 2,4-heptanediol, hexylene glycol, 1,5-pentanediol, propylene glycol, 1,3-butylene glycol, and dipropylene glycol; ethylene oxide, dioxane, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monoisopropyl ether, and ethylene glycol. Examples of the ethers include glycol monobutyl ether, diethylene glycol monomethyl ether, dimethylene glycol monoethyl ether, dimethylene glycol monomethyl ether, dimethylene glycol monobutyl ether, dimethylene glycol diethyl ether, ethoxytriglycol, monopropylene glycol methyl ether, dipropylene glycol methyl ether, tripropylene glycol monomethyl ether, ethylene glycol monomethyl ether acetate, diethylene glycol monomethyl ether acetate, diethylene glycol monoethyl ether acetate, and polyoxyethylene / polyoxypropylene random polymer methyl ether. Polyhydric alcohols are preferred.

[0017] One or more types of component (C) can be blended in. The blend amount of component (C) is preferably 1 to 15 mass %, more preferably 2 to 12 mass %, based on the total amount of the cosmetic.

[0018] (D) Oil The cosmetic according to the present invention comprises an oil (D). Examples of component (D) include ester oil, hydrocarbon oil, silicone oil, higher fatty acid, higher alcohol, alkyl glyceryl ether, liquid oil, solid oil, and semi-solid oil, and ester oil is preferred.

[0019] Examples of ester oils include octyl octanoate, nonyl nonanoate, cetyl octanoate, isopropyl myristate, octyldodecyl myristate, isopropyl palmitate, ethylhexyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, and cholesteryl 12-hydroxystearate. Ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, tripropylene glycol pivalate, diisostearyl malate, glycerin di-2-heptylundecanoate, glycerin diisostearate, trimethylolpropane tri-2-ethylhexanoate, trimethylolpropane triisostearate, pentaerythrityl tetraethylhexanoate, tri- Glyceryl 2-ethylhexanoate (triethylhexanoin), glyceryl trioctanoate, glyceryl triisopalmitate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate-2-ethylhexyl palmitate, glyceryl trimyristate, tri-2-heptylundecanoic acid glyceride, castor oil fatty acid methyl ester, oleyl oleate, acetoglyceride, 2-heptylundecyl palmitate, diisobutyl adipate, N-lauroyl 2-octyldodecyl-L-glutamate, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, triethyl citrate, cetyl ethylhexanoate, macadamia nut fatty acid phytosteryl, and the like are included, and pentaerythrityl tetraethylhexanoate is preferred.

[0020] Examples of hydrocarbon oils include isododecane, isohexadecane, isoparaffin, mineral oil (liquid paraffin), ozokerite, squalane, pristane, paraffin, ceresin, squalene, petrolatum, microcrystalline wax, and hydrogenated polydecene.

[0021] Examples of silicone oils include linear polysiloxanes (e.g., dimethicone, diphenylsiloxyphenyltrimethicone, 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, with linear polysiloxanes being preferred.

[0022] Examples of 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 (EPA), and docosahexaenoic acid (DHA).

[0023] Examples of 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., lanolin alcohol, cholesterol, phytosterol, hexyldodecanol, isostearyl alcohol, octyldodecanol, etc.), and the like.

[0024] Examples of alkyl glyceryl ethers include batyl alcohol and chimyl alcohol.

[0025] Examples of liquid oils include avocado oil, camellia oil, macadamia nut oil, corn oil, olive oil, rapeseed 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, kaya oil, rice bran oil, Chinese tung oil, Japanese tung oil, jojoba oil, germ oil, triglycerin, etc. Examples of solid oils include cocoa butter, coconut oil, hardened coconut oil, palm oil, palm kernel oil, hydrogenated palm oil, Japan wax kernel oil, hardened oil, Japan wax, etc. Examples of semi-solid oils include shea butter, partially hydrogenated coconut oil, partially hydrogenated jojoba oil, etc.

[0026] One or more types of component (D) can be blended in. The blend amount of component (D) is preferably 3 to 30 mass %, more preferably 4 to 20 mass %, based on the total amount of the cosmetic.

[0027] (E)Water The cosmetic preparation according to the present invention comprises (E) water. As the water, the water used in cosmetics, quasi-drugs, etc., such as purified water, ion-exchanged water, tap water, etc., can be used. The blending amount of water is preferably 50 to 90% by mass, more preferably 55 to 85% by mass, based on the total amount of the cosmetic according to the present invention.

[0028] In addition to the above-mentioned components, the cosmetic preparation of the present invention can contain optional components typically used in cosmetics and pharmaceuticals. Examples of optional components include powder components, moisturizers, water-soluble polymers, UV absorbers, sequestering agents, amino acids, organic amines, pH adjusters, antioxidants, and other components typically used in cosmetics. One or more of these can be contained as long as the effects of the present invention are achieved.

[0029] Examples of the powder component include inorganic powders (e.g., talc, kaolin, mica, sericite, muscovite, phlogopite, synthetic mica, lepidolite, biotite, vermiculite, magnesium carbonate, calcium carbonate, aluminum silicate, barium silicate, calcium silicate, magnesium silicate, strontium silicate, tungstate metal salts, magnesium, silica, zeolite, barium sulfate, calcined calcium sulfate, calcium phosphate, fluorapatite, hydroxyapatite, ceramic powder, metal soaps (e.g., zinc myristate, calcium palmitate), inorganic white pigments (e.g., titanium dioxide, zinc oxide, etc.); inorganic red pigments (e.g., iron oxide (red iron), iron titanate, etc.); inorganic brown pigments (e.g., γ-iron oxide, etc.); inorganic yellow pigments (e.g., yellow iron oxide, yellow ochre, etc.); inorganic black pigments (e.g., For example, black iron oxide, low-order titanium oxide, etc.; inorganic purple pigments (for example, mango violet, cobalt violet, etc.); inorganic green pigments (for example, chromium oxide, chromium hydroxide, cobalt titanate, etc.); inorganic blue pigments (for example, ultramarine, Prussian blue, etc.); pearl pigments (for example, titanium oxide coated mica, titanium oxide coated bismuth oxychloride, titanium oxide coated talc, colored titanium oxide coated mica, bismuth oxychloride, fish scale foil, etc.); metal powder pigments (for example, aluminum powder, copper powder, etc.); zirconium, barium or Organic pigments such as aluminum lakes (e.g., organic pigments such as Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 226, Red No. 228, Red No. 405, Orange No. 203, Orange No. 204, Yellow No. 205, Yellow No. 401, and Blue No. 404, Red No. 3, Red No. 104, Red No. 106, Red No. 227, Red No. 230, Red No. 401, Red No. 505, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow No. 202, Yellow No. 203, Green No. 3, and Blue No. 1); natural pigments (e.g., chlorophyll, β-carotene, etc.), etc.

[0030] Examples of moisturizing agents include xylitol, sorbitol, maltitol, trehalose, erythritol, chondroitin sulfate, hyaluronic acid, mucoitin sulfate, caronic acid, fish collagen, phytosteryl-12-hydroxystearate, sodium lactate, dl-pyrrolidone carboxylate, diglycerin (EO)PO adduct, Rosa robur extract, yarrow extract, and melilot extract.

[0031] Examples of natural water-soluble polymers include plant-derived polymers (e.g., gum arabic, tragacanth gum, galactan, guar gum, carob gum, karaya gum, carrageenan, pectin, agar, quince seed, algae colloid (cassow extract), starch (rice, corn, potato, wheat); and microbial-derived polymers (e.g., xanthan gum, dextran, succinoglucan, pullulan, etc.).

[0032] Examples of semi-synthetic water-soluble polymers include starch-based polymers (e.g., carboxymethyl starch, methylhydroxypropyl starch, etc.); cellulose-based polymers (methyl cellulose, ethyl cellulose, methylhydroxypropyl cellulose, hydroxyethyl cellulose, sodium cellulose sulfate, hydroxypropyl cellulose, carboxymethyl cellulose, sodium carboxymethyl cellulose, crystalline cellulose, cellulose powder, etc.); and alginic acid-based polymers (e.g., sodium alginate, propylene glycol alginate, etc.).

[0033] Examples of synthetic water-soluble polymers include vinyl polymers (e.g., polyvinyl alcohol, polyvinylpyrrolidone, carboxyvinyl polymer, etc.); polyoxyethylene polymers (e.g., polyoxyethylene-polyoxypropylene copolymers of polyethylene glycol 20,000, 40,000, 60,000, 1,000,000, etc.); acrylic polymers (e.g., sodium polyacrylate, polyethyl acrylate, polyacrylamide, etc.); cationic polymers, etc.

[0034] Examples of the ultraviolet absorber include benzoic acid-based ultraviolet absorbers (e.g., para-aminobenzoic acid (hereinafter abbreviated as PABA), PABA monoglycerin ester, N,N-dipropoxy PABA ethyl ester, N,N-diethoxy PABA ethyl ester, N,N-dimethyl PABA ethyl ester, N,N-dimethyl PABA butyl ester, N,N-dimethyl PABA ethyl ester, etc.); anthranilic acid-based ultraviolet absorbers (e.g., homomenthyl-N-acetylanthranilate, etc.); salicylic acid-based ultraviolet absorbers (e.g., amyl salicylate, menthyl salicylate, homomenthyl salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, p-isopropanol phenyl salicylate, etc.; cinnamic acid-based ultraviolet absorbers (e.g., octyl cinnamate, ethyl 4-isopropyl cinnamate, methyl 2,5-diisopropyl cinnamate, ethyl 2,4-diisopropyl cinnamate, methyl 2,4-diisopropyl cinnamate, propyl p-methoxy cinnamate, isopropyl p-methoxy cinnamate, etc.); mate, isoamyl-p-methoxycinnamate, octyl-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-para-methoxycinnamate, etc.; pyridazine derivatives (dimorpholinopyridazine); 3-(4'-methylbenzylidene) 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole; 2-(2'-hydroxy-5'-methylphenyl)benzotriazole; dibenzalazine; dianisoylmethane; 4-methoxy-4'-t-butyldibenzoylmethane; 5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one, and the like.

[0035] Examples of sequestering agents include 1-hydroxyethane-1,1-diphosphonic acid, 1-hydroxyethane-1,1-diphosphonic acid tetrasodium salt, edetate disodium, edetate trisodium, edetate tetrasodium, sodium citrate, sodium polyphosphate, sodium metaphosphate, gluconic acid, phosphoric acid, citric acid, ascorbic acid, succinic acid, edetic acid, and ethylenediaminehydroxyethyltriacetate trisodium salt.

[0036] Examples of amino acids include neutral amino acids (e.g., threonine, cysteine, etc.), basic amino acids (e.g., hydroxylysine, arginine, etc.), etc. Examples of amino acid derivatives include sodium acyl sarcosine (sodium lauroyl sarcosine), acyl glutamate, acyltaurate, sodium acyl β-alanine, glutathione, pyrrolidone carboxylic acid, trimethylglycine, etc.

[0037] Examples of organic amines include monoethanolamine, diethanolamine, triethanolamine, morpholine, triisopropanolamine, 2-amino-2-methyl-1,3-propanediol, and 2-amino-2-methyl-1-propanol.

[0038] Examples of pH adjusters include buffers such as lactic acid-sodium lactate, citric acid-sodium citrate, and succinic acid-sodium succinate. Examples of antioxidants include δ-tocopherol, dibutylhydroxytoluene, butylhydroxyanisole, and gallic acid esters.

[0039] Other ingredients that can be added include, for example, preservatives (ethylparaben, butylparaben, phenoxyethanol, etc.); water-soluble whitening agents (for example, arbutin, tranexamic acid, potassium 4-methoxysalicylate, ellagic acid, ascorbic acid, ascorbic acid glucoside, ascorbic acid phosphate magnesium ester, and other ascorbic acid derivatives); activators (for example, royal jelly, photosensitizers, cholesterol derivatives); blood circulation promoters (for example, nonylic acid valenylamide, nicotinic acid benzyl ester, nicotinic acid β-butoxyethyl ester, capsaicin, ginger, etc.). antiseborrheic agents (e.g., sulfur, thianthol, etc.); anti-inflammatory agents (e.g., glycyrrhizinate, salicylic acid derivatives, hinokitiol, zinc oxide, allantoin, thiotaurine, hypotaurine, etc.), vitamin B6 tripalmitate, vitamin B6 dioctanoate, vitamin B2, vitamin B2 derivatives, vitamin B12, vitamin B15, vitamin B15 derivatives, etc.

[0040] The cosmetic of the present invention is not particularly limited in the emulsification method, but the method according to the present invention comprises the following steps (I) to (III). (I) adding a hydrophilic nonionic surfactant to an aqueous solvent, and then adding an oil component thereto to form an emulsion composition; (II) adding water to the emulsion composition to form an oil-in-water emulsion composition; and (III) A step of adding an aqueous solution containing the cyclic carboxamide derivative or a salt thereof to the oil-in-water emulsion composition to form an oil-in-water emulsion cosmetic.

[0041] The method according to the present invention involves emulsifying an oil-water-soluble solvent system in the first step, instead of the conventional oil-water system, adding water to stabilize the emulsion in the second step, and then adding an aqueous solution containing other components in the third step. The surface tension of the water-soluble solvent is much smaller than that of water. Therefore, there are no strong hydrogen bonds between the water-soluble solvent and the hydrophilic nonionic surfactant, as there are between water and the hydrophilic nonionic surfactant.

[0042] Therefore, in the method of the present invention, a hydrophilic nonionic surfactant is dissolved in an aqueous solvent, and then an oil is added to the solution to emulsify it. Therefore, the interfacial tension between the oil and the aqueous solvent is low, and even hydrophilic nonionic surfactants with low surface activity can be easily adsorbed to the interface with very little stirring force. Furthermore, since there is no need to apply heat, the manufacturing process is simplified. Therefore, even heat-sensitive medicinal ingredients can be stably incorporated. In the method of the present invention, all steps are preferably carried out at room temperature (5 to 40°C). Furthermore, by adding water after the process, an extremely stable oil-in-water emulsion cosmetic can be obtained that has low viscosity, a non-sticky, pleasant feel, a small particle size, and good uniformity. This method results in an average emulsion particle size of approximately less than 1 μm.

[0043] Examples of the cosmetic according to the present invention include skin care cosmetics (e.g., lotion, emulsion, cream, serum, pack, mask, etc.), makeup cosmetics (e.g., foundation, makeup base, etc.), skin cleansers (e.g., face wash, makeup remover, etc.), sunscreen cosmetics, ointments, etc. In a preferred embodiment, the cosmetic is used by impregnating a sheet-like substrate. These forms are merely examples, and the cosmetic material according to the present invention is not limited to these forms. [Example]

[0044] The present invention will be described in detail based on the following examples, but the present invention is not limited to these examples. Unless otherwise specified, the contents are expressed in mass % relative to the total amount.

[0045] [Examples 1 to 5 and Comparative Examples 1 to 7] Cosmetics of Examples 1 to 5 and Comparative Examples 1 to 7 were prepared according to the formulations shown in Table 1. The numerical values ​​for each component in the table indicate mass %. Examples 1 to 5 were prepared by adding component (B) to component (C), adding component (D) to this to form an emulsion composition, adding water to form an oil-in-water emulsion composition, and then adding an aqueous solution containing component (A). [Table 1]

[0046] [viscosity] The cosmetics prepared above were measured at 30°C using a BL-type viscometer (No. 1 rotor, rotation speed 12 rpm). The cosmetics of Examples 4 and 5 and Comparative Example 7 had a viscosity of 500 mPa·s, while the other cosmetics had a viscosity of 100 mPa·s or less.

[0047] [Average particle size] The cosmetic preparation was observed under a microscope immediately after preparation, and the diameters of 100 emulsion particles were measured. The average value was taken as the average particle diameter. The results are shown in Table 1.

[0048] The cosmetics prepared above were applied to the skin by a panel of 10 experts, who evaluated them for "non-stickiness" after application, "skin compatibility" during application, "moisturizing feeling," and "refreshing feeling on the skin" after application. Based on the evaluations of each expert panel, the evaluation was conducted according to the following criteria. The results are shown in Table 1. [Non-sticky] A: More than 9 out of 10 panelists answered that it was not sticky. B: Between 6 and 8 out of 10 panelists answered that it was not sticky. C: Between 3 and 5 out of 10 panelists answered that it was not sticky. D: One to two out of 10 panelists answered that it was not sticky. E: No panelists answered that it was not sticky. [Skin compatibility] A: More than 9 out of 10 panelists answered that it blended well with their skin. B: Between 6 and 8 out of 10 panelists answered that the product blended well with their skin. C: Between 3 and 5 out of 10 panelists answered that the product blended well with their skin. D: Between 1 and 2 out of 10 panelists answered that the product blended well with their skin. E: None of the panelists answered that it blended well with the skin. [Freshness] A: More than 9 out of 10 panelists answered that they felt a sense of freshness. B: Between 6 and 8 out of 10 panelists answered that they felt the freshness. C: Between 3 and 5 out of 10 panelists answered that they felt the freshness. D: Between 1 and 2 out of 10 panelists answered that they felt the freshness. E: None of the panelists answered that they felt it was fresh. [Refreshing after-skin feeling] A: More than 9 out of 10 panelists answered that they felt their skin felt refreshed after use. B: Between 6 and 8 out of 10 panelists answered that they felt their skin was refreshed after use. C: Between 3 and 5 out of 10 panelists answered that they felt their skin was refreshed after use. D: Between 1 and 2 out of 10 panelists answered that they felt their skin was refreshed after use. E: Also, no panelists answered that they felt their skin was refreshed.

Claims

1. (A) A cyclic carboxamide derivative represented by formula (1) or a salt thereof 【Chemistry 1】 (In the formula, R １ represents a hydrocarbon group having 1 to 6 carbon atoms which may be substituted with a hydroxyl group, or a hydrogen atom, X is -CH ２ - or -N(R ２ )—, where R ２ represents a hydrocarbon group having 1 to 6 carbon atoms which may be substituted with a hydroxyl group, or a hydrogen atom, and n is an integer from 1 to 3), (B) a hydrophilic nonionic surfactant, (C) a water-soluble solvent, (D) oil, and (E) Water An oil-in-water emulsion cosmetic comprising: The component (A) is 1-(2-hydroxyethyl)-2-imidazolidinone, The component (B) is PEG-60 hydrogenated castor oil, Emulsion particles containing component (D) are dispersed in an aqueous phase, and the average particle size of the emulsion particles is less than 1 μm; and The blending amount of component (A) is 0.01 to 8% by mass relative to the total amount of the cosmetic, An oil-in-water emulsion cosmetic, in which the blending amount of component (B) is 0.01 to 3 mass % relative to the total amount of the cosmetic.

2. 2. The cosmetic according to claim 1, wherein the blending amount of component (A) is 0.01 to 5% by mass relative to the total amount of the cosmetic.

3. 3. The cosmetic according to claim 1, wherein the blending amount of component (D) is 3 to 30% by mass relative to the total amount of the cosmetic.

4. The cosmetic preparation according to any one of claims 1 to 3, having a viscosity of 1 to 3,000 mPa·s as measured at 30°C using a Brookfield type rotational viscometer.

5. The following steps: (I) adding a hydrophilic nonionic surfactant to an aqueous solvent, and then adding an oil component thereto to form an emulsion composition; (II) adding water to the emulsion composition to form an oil-in-water emulsion composition; and (III) A step of adding an aqueous solution containing the cyclic carboxamide derivative or a salt thereof to the oil-in-water emulsion composition to form an oil-in-water emulsion cosmetic. The method for producing the cosmetic preparation according to any one of claims 1 to 4, comprising:

Images