Emulsion composition

Abstract

To provide a new emulsifying composition with excellent stability. [Solution] An emulsified composition comprising an acyl group-containing amino acid and / or a salt thereof, at least two water-soluble natural polymers, and oil.

Description

Technical Field

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[0001] The present invention relates to an emulsified composition.

Background Art

[0002] The emulsification technology used in emulsified compositions is widely used in products such as pharmaceuticals, quasi-drugs, and cosmetics. In particular, when an oil-in-water type emulsified composition in which the continuous phase is an aqueous phase is used as a topical preparation for the skin such as cosmetics, it has less stickiness and a good feeling of use. Therefore, emulsified compositions are widely used as topical preparations such as creams and lotions.

[0003] ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Even without using water-soluble synthetic polymers, an emulsified composition with excellent stability can be provided by using a combination of acyl group-containing amino acids and / or salts thereof and at least two types of water-soluble natural polymers.

[0008] The present invention includes the following embodiments. [1] Acyl group-containing amino acids and / or salts thereof, At least two types of water-soluble natural polymers, oil and An emulsified composition containing the following: [2] The emulsified composition according to [1], wherein the water-soluble natural polymer comprises at least two selected from the group consisting of sclerotium gum, carrageenan, sodium alginate, glucomannan, tamarind gum, locust bean gum, gellan gum, carboxymethylcellulose, hydroxypropylmethylcellulose, guar gum, xanthan gum, acacia gum, and Alcaligenes-producing polysaccharides. [3] The emulsified composition according to [1] or [2], wherein the total amount of the water-soluble natural polymer is 0.3% by mass or more and 2.0% by mass or less, based on the mass of the emulsified composition. [4] The emulsifying composition according to any one of [1] to [3], wherein the amount of synthetic polymer is less than 0.1% by mass, based on the mass of the emulsifying composition. [5] An emulsified composition according to any one of [1] to [4], which does not contain synthetic polymers. [6] An emulsifying composition according to any one of [1] to [5], further comprising a polyhydric alcohol. [7] An emulsified composition according to any one of [1] to [6], further comprising water. [8] An emulsified composition according to any one of [1] to [7], further comprising an electrolyte. [9] The acyl group-containing amino acid and / or salt thereof is represented by the following general formula (1): [Chemical formula] (In formula (1), R1 and R2 are each independently a saturated or unsaturated linear or branched hydrocarbon group, M1, M2, and M3 are each independently a hydrogen atom, an alkali metal, an alkaline earth metal, an organic or inorganic amine, a basic amino acid, choline, aluminum, or zinc, n - 1 and n - 2 are 0 and 2, or 2 and 0, (n - 3 and n - 4 are 0 and 2, or 2 and 0)) The emulsified composition according to any one of [1] to [8].

[10] The emulsified composition according to any one of [1] to [9], wherein the acyl group - containing amino acid and / or its salt is lysine dilauroyl glutamate. [Advantages of the Invention]

[0009] The present invention can provide an emulsified composition having excellent stability. [Modes for Carrying Out the Invention]

[0010] Hereinafter, embodiments of the present invention will be specifically described, but the present invention is not limited thereto, and various modifications are possible without departing from the gist thereof.

[0011] [Emulsified Composition] One embodiment of the present invention relates to an emulsified composition containing an acyl group - containing amino acid and / or its salt, at least two kinds of water - soluble natural polymers, and an oil.

[0012] The emulsified composition according to this embodiment can achieve excellent stability by combining an acyl group - containing amino acid and / or its salt with at least two kinds of water - soluble natural polymers without using a water - soluble synthetic polymer.

[0013] ​In this specification, "emulsification" means that one of the liquids that do not dissolve in each other, such as oil and water, is dispersed as fine droplets in the other liquid.

[0014] The emulsified composition is preferably an oil-in-water type emulsified composition.

[0015] [Viscosity] The viscosity of the emulsified composition is preferably 1000 mPa·s or more and 12000 mPa·s or less, more preferably 1500 mPa·s or more and 11000 mPa·s or less, and still more preferably 1700 mPa·s or more and 10000 mPa·s or less.

[0016] When the viscosity of the emulsified composition is 1000 mPa·s or more, creaming in which the emulsified particles settle can be suppressed. When the viscosity of the emulsified composition is 12000 mPa·s or less, good elongation when applied to the skin can be felt.

[0017] The viscosity of the emulsified composition can be adjusted, for example, by changing the amount or type of the water-soluble natural polymer.

[0018] The viscosity of the emulsified composition can be measured by the method described in the examples below.

[0019] [Volume average particle diameter] The emulsified particle diameter (volume average particle diameter) of the emulsified composition is preferably 10 μm or less, more preferably 5 μm or less, and still more preferably 3 μm or less from the viewpoints of good usability and emulsification stability.

[0020] When the emulsified particle diameter of the emulsified composition is 10 μm or less, improvement in the stability of the emulsified composition can be expected.

[0021] The emulsified particle diameter of the emulsified composition shall refer to the particle diameter (median diameter) corresponding to the 50% cumulative value in the cumulative distribution curve. <00001​​The particle size of the emulsion in the emulsion composition can be measured by the method described in the examples below.

[0023] [pH] The pH of the emulsified composition is preferably 5.00 to 8.00, more preferably 6.00 to 7.50, and even more preferably 6.50 to 7.20.

[0024] Having a pH of 5.00 or higher in the emulsified composition is expected to improve its stability. By having an emulsified composition with a pH of 8.00 or lower, the burden on the skin can be reduced.

[0025] The pH of the emulsified composition can be adjusted, for example, by changing the amount or type of electrolyte.

[0026] The pH of the emulsified composition can be measured by the method described in the examples below.

[0027] [Acyl group-containing amino acids and / or salts thereof (Component A)] The emulsified composition contains an acyl group-containing amino acid and / or a salt thereof (also referred to as "component A"). By using component A in combination with a water-soluble natural polymer described later, an emulsified composition with excellent stability can be provided without using synthetic polymers.

[0028] Acyl group-containing amino acids and / or salts thereof preferably contain carboxylic acid groups. The number of carboxylic acid groups is preferably 2 to 5, more preferably 2 to 4, even more preferably 2 or 3, and particularly preferably 3. Each of the multiple carboxylic acid groups may be independently free carboxylic acid groups or may form a salt.

[0029] In this specification, "acyl group-containing amino acids and / or salts thereof" means compounds in which the amino group of an amino acid (including condensates of multiple amino acids) is acylated, or salts thereof.

[0030] Examples of amino acids contained in acyl group-containing amino acids and / or their salts include α-amino acids, β-amino acids, γ-amino acids, and ω-amino acids. The amino acids may also be, for example, N-methylated or N-ethylated. Furthermore, the amino acids may be optical isomers, i.e., D-forms, L-forms, or racemic mixtures.

[0031] Specific examples of amino acids include glutamic acid, aspartic acid, β-oxyaspartic acid, β-oxyglutamic acid, γ-oxyglutamic acid, γ-methylglutamic acid, γ-methyleneglutamic acid, γ-methyl-γ-oxyglutamic acid, and α-aminosebacic acid. Among these, acyl group-containing amino acids and / or salts thereof are preferably those having a structure corresponding to glutamic acid, and more preferably those having a structure corresponding to acylated glutamic acid.

[0032] Examples of acyl group-containing amino acids and / or salts thereof include compounds represented by the following general formula (1). [ka] (In formula (1), R1 and R2 are each independently saturated or unsaturated linear or branched hydrocarbon groups. M1, M2, and M3 are, independently, a hydrogen atom, an alkali metal, an alkaline earth metal, an organic or inorganic amine, a basic amino acid, choline, aluminum, or zinc. n1 and n2 are either 0 and 2, or 2 and 0. n3 and n4 are either 0 and 2, or 2 and 0.

[0033] In general formula (1), R1 and R2 are each independently saturated or unsaturated linear or branched hydrocarbon groups, preferably saturated linear or branched hydrocarbon groups, and more preferably saturated linear hydrocarbon groups.

[0034] The number of carbon atoms in the hydrocarbon groups R1 and R2 is preferably 1 to 29, more preferably 7 to 23, and even more preferably 7 to 17, respectively.

[0035] R1 and R2 may each be independently a hydrocarbon group having 9 carbon atoms, 11 carbon atoms, 13 carbon atoms, 15 carbon atoms, 17 carbon atoms, 19 carbon atoms, or 21 carbon atoms.

[0036] The R1-C(=O)- structure and the R2-C(=O)- structure (acyl group) in general formula (1) may independently be a caproyl group, an undererilenoyl group, a lauroyl group, a myristoyl group, an isomyristoyl group, a palmitoyl group, an isopalmitoyl group, a stearoyl group, an isostearoyl group, an oleyl group, a linolyl group, a linoleyl group, an arachidyl group, or a behenyl group, with a lauroyl group or a myristoyl group being preferred.

[0037] In general formula (1), the three carboxylic acid portions (COOM1, COOM2, COOM3) may all be free carboxylic acids, all be carboxylates, or be a combination of free carboxylic acids and carboxylates. Examples of carboxylates include alkali metal salts such as sodium salts, potassium salts, and lithium salts; alkaline earth metal salts such as magnesium salts and calcium salts; organic or inorganic amine salts such as ammonium salts, alkylamine salts, monoethanolamine salts, diethanolamine salts, triethanolamine salts, and aminomethylpropanol salts; basic amino acid salts such as lysine salts and arginine salts; and choline salts.

[0038] Examples of acyl group-containing amino acids and / or salts thereof include acylated glutamic acid and / or salts thereof. Examples of the acyl group of acylated glutamic acid or its salts include the acyl group exemplified in relation to general formula (1). Examples of salts of acylated glutamic acid include the salt exemplified in relation to general formula (1).

[0039] The acyl group-containing amino acid and / or salt thereof is preferably a diacyl amino acid salt, more preferably a dilauroyl glutamate lysine salt, and even more preferably dilauroyl glutamate lysine sodium.

[0040] The amount of acyl group-containing amino acids and / or their salts is preferably 0.01% by mass or more and 10% by mass or less, more preferably 0.05% by mass or more and 5% by mass or less, and even more preferably 0.08% by mass or more and 1% by mass or less, based on the mass of the emulsified composition.

[0041] The stability of the emulsified composition can be improved by having an amount of acyl group-containing amino acids and / or their salts between 0.01% by mass and 10% by mass.

[0042] [Water-soluble natural polymer (component B)] The emulsified composition contains at least two water-soluble natural polymers (also referred to as "component B"). By using at least two components B in combination with component A, an emulsified composition with excellent stability can be provided without using synthetic polymers. This effect is remarkable because natural polymers have a lower thickening effect compared to synthetic polymers.

[0043] Water-soluble natural polymers are natural polymers that have a solubility of 30 g / L or more in water at 20°C.

[0044] Examples of water-soluble natural polymers include sclerotium gum, carrageenan, sodium alginate, glucomannan, tamarind gum, locust bean gum, gellan gum, carboxymethylcellulose, hydroxypropylmethylcellulose, guar gum, xanthan gum, acacia gum, and Alcaligenes-producing polysaccharides.

[0045] The total amount of at least two water-soluble natural polymers is preferably 0.3% by mass or more and 2.0% by mass or less, more preferably 0.5% by mass or more and 1.5% by mass or less, and even more preferably 0.6% by mass or more and 1.0% by mass or less, based on the mass of the emulsified composition. The stability of the emulsified composition can be improved by ensuring that the total amount of water-soluble natural polymers is 0.3% by mass or more. By keeping the total amount of water-soluble natural polymers at 2.0% by mass or less, the feel of the emulsified composition can be improved.

[0046] The total amount of at least two water-soluble natural polymers is preferably 2.5 to 25 times, more preferably 5 to 18 times, and even more preferably 6 to 15 times, the mass of component A, from the viewpoint of emulsification stability and usability.

[0047] [Water-soluble synthetic polymer] The emulsified composition preferably does not contain water-soluble synthetic polymers. Furthermore, if water-soluble synthetic polymers are present, it is preferable that the amount is small. Since synthetic polymers often contain residual catalysts and solvents used in the synthesis process, the absence of water-soluble synthetic polymers, or their small amount, improves safety.

[0048] Water-soluble synthetic polymers are synthetic polymers that have a solubility of 30 g / L or more in water at 20°C.

[0049] Examples of water-soluble synthetic polymers include carboxyvinyl polymers (carbomers), polyethylene glycol, polyvinyl alcohol, and polyvinylpyrrolidone.

[0050] The amount of water-soluble synthetic polymer is preferably less than 0.1% by mass, more preferably less than 0.01% by mass, and even more preferably less than 0.001% by mass, based on the mass of the emulsified composition.

[0051] [Oil (component C)] The emulsified composition contains oil (also referred to as "component C"). Component C preferably forms an oil phase as a dispersed phase. As component C, oils that can be used in general cosmetics can be used, and examples include hydrocarbon oils, ester oils, silicone oils, vitamins, hormones, whitening agents, anti-inflammatory and antihistamines, antioxidants, intercellular lipids, UV absorbers, various moisturizers, and various fragrances.

[0052] Examples of hydrocarbon oils include liquid paraffin, polybutene, hydrogenated polyisobutene, hydrogenated polydecene, squalane, squalene, pristane, light isoparaffin, light liquid isoparaffin, heavy liquid isoparaffin, tetradecene, isohexadecane, isododecane, α-olefin oligomer, petrolatum, microcrystalline wax, paraffin, polyethylene, ceresin, and the like.

[0053] Ester oils are oils containing an ester group, and include triglycerides of fatty acids and glycerol, oils and fats, and esters of amino acids or fatty acids with monohydric or more alcohols. Examples of triglycerides include triglycerides of fatty acids and glycerin, such as caproic acid, caprylic acid, capric acid, 2-ethylhexanoic acid, lauric acid, tridecanoic acid, isotridecanoic acid, myristic acid, palmitic acid, isopalmitic acid, stearic acid, isostearic acid, eicosanoic acid, behenic acid, tetracosanoic acid, myristrenic acid, palmitolenic acid, oleic acid, elaidic acid, erucic acid, linoleic acid, linolenic acid, arachidonic acid, hydroxystearic acid, coconut oil fatty acid, palm kernel oil fatty acid, hydrogenated palm kernel oil fatty acid, palm oil fatty acid, beef tallow fatty acid, hydrogenated beef tallow fatty acid, lard fatty acid, castor oil fatty acid, and hydrogenated castor oil fatty acid.

[0054] Examples of oils and fats include olive oil, sunflower oil, palm oil, palm kernel oil, safflower oil, castor oil, hydrogenated castor oil, coconut oil, camellia oil, cocoa butter, and shea butter.

[0055] Examples of esters of amino acids with monohydric or polyhydric alcohols include N-lauroyl-L-glutamate dihexyldecyl, N-lauroyl-L-glutamate diisostearyl, N-lauroyl-L-glutamate bis(hexyldecyl / octyldodecyl), N-lauroyl-L-glutamate dioctyldodecyl, N-stearoyl-L-glutamate dioctyldodecyl, N-myristoyl-N-methyl-β-alanine phytosteryl, N-lauroyl-L- Examples include di(cholesteryl / behenyl / 2-octyldodecyl) glutamate, di(phytosteryl / behenyl / 2-octyldodecyl) N-lauroyl-L-glutamate, di(cholesteryl / 2-octyldodecyl) N-lauroyl-L-glutamate, di(phytosteryl / 2-octyldodecyl) N-lauroyl-L-glutamate, and di(phytosteryl / behenyl / 2-octyldodecyl / isostearyl) glutamate.

[0056] Examples of esters of fatty acids with monohydric or polyhydric alcohols include ethyl oleate, ethyl linoleate, isopropyl myristate, isopropyl palmitate, isopropyl isostearate, isopropyl lanolinate, cetyl 2-ethylhexanoate, isocetyl 2-ethylhexanoate, stearyl 2-ethylhexanoate, isostearyl 2-ethylhexanoate, cetyl palmitate, 2-ethylhexyl palmitate, 2-hexyldecyl isostearate, isostearyl isostearate, and triisostearate. Trimethylolpropane, myristyl myristate, cetyl myristate, octyldodecyl myristate, isostearyl myristate, isocetyl myristate, hexyl laurate, decyl oleate, octyldodecyl oleate, isostearyl pivalate, isopropyl isostearate, isononyl isononanoate, 2-ethylhexyl isononanoate, isodecyl isononanoate, isotridecyl isononanoate, octyldodecyl erucate, neopentyl glycol didecanoate, pentaethylhexanoate Lithrichyl, Diisostearyl Malate, Didecyl Adipate, Glyceryl Isostearate, Hydrogenated Castor Oil Isostearate, Cholesteryl Isostearate, Batyl Isostearate, Phytosteryl Isostearate, Octyl Oxystearate, Dihydrocholesteryl Oleate, Phytosteryl Oleate, Hydrogenated Castor Oil Stearate, Cholesteryl Soft Lanolin Fatty Acid, Cholesteryl Hydroxystearate, Dipentaerythritol Hexaoxystearate, Hydrogenated Castor Oil Monohydroxystearate, La Examples include isostearyl lanolinate, isopropyl lanolinate, octyldodecyl lanolinate, cholesteryl stearate, cholesteryl lanolinate, cetyl ricinoleate, dioctyl succinate, cetyl lactate, propylene glycol dicaprylate, propylene glycol dicaprate, propylene glycol dinonanoate, di(caprylic / capric acid) propylene glycol, propylene glycol distearate, propylene glycol diisostearate, and propylene glycol dioleate.

[0057] These ester oils can be used individually or in combination of two or more.

[0058] Preferred ester oils include, for example, triglycerides of fatty acids with 6 or more carbon atoms, oils and fats, cetyl 2-ethylhexanoate, isocetyl 2-ethylhexanoate, isopropyl palmitate, ethylhexyl 2-ethylhexyl palmitate, isopropyl isostearate, hexyldecyl 2-isostearate, octyldodecyl myristate, isopropyl myristate, isostearyl myristate, isocetyl myristate, isononyl isononanoate, ethylhexyl isononanoate, isodecyl isononanoate, isotridecyl isononanoate, beeswax, and mologro. Examples include N-myristoyl-N-methyl-β-alanine phytosteryl, N-lauroyl-L-glutamic acid di(cholesteryl / behenyl / 2-octyldodecyl), N-lauroyl-L-glutamic acid di(phytosteryl / behenyl / 2-octyldodecyl), N-lauroyl-L-glutamic acid di(cholesteryl / 2-octyldodecyl), N-lauroyl-L-glutamic acid di(phytosteryl / 2-octyldodecyl), and N-lauroyl-L-glutamic acid di(phytosteryl / behenyl / 2-octyldodecyl / isostearyl).

[0059] Examples of silicone oils include linear polysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, and diphenylsiloxyphenyl trimethicone, as well as cyclic polysiloxanes such as pentasiloxane, decamethylpolysiloxane, dodecamethylpolysiloxane, and tetramethyltetrahydrogenpolysiloxane.

[0060] Examples of vitamins include vitamin A and its derivatives, lipid-soluble derivatives of vitamin B2, lipid-soluble derivatives of vitamin B6, lipid-soluble derivatives of vitamin C, amphiphilic derivatives of vitamin C such as trisodium ascorbyl palmitate phosphate, vitamin D, vitamin E and its derivatives such as tocopherol and tocopherol acetate, vitamin H, lipid-soluble derivatives of pantothenic acid, and coenzyme Q10 (vitamin Q).

[0061] Examples of hormones include cortisone, hydrocortisone, estradiol, and estrone.

[0062] Examples of skin whitening agents include kojic acid, placenta extract, arbutin, ellagic acid, rucinol, and linoleic acid.

[0063] Examples of anti-inflammatory and antihistamine agents include glycyrrhetinic acid and its derivatives, allantoin, hydrocortisone acetate, and prednisolone.

[0064] Examples of antioxidants (anti-aging agents) include polyphenols, carotenoids, flavonoids, N-methyl-L-serine, and ursolic acid.

[0065] Examples of intercellular lipids include ceramides and cholesterol.

[0066] Examples of UV absorbers include para-aminobenzoic acid derivatives, cinnamic acid derivatives, benzophenone derivatives, and salicylic acid derivatives.

[0067] Examples of moisturizing agents include hyaluronic acid derivatives, collagen derivatives, elastin derivatives, and keratin derivatives.

[0068] Examples of fragrances include various plant extracts and limonene.

[0069] One of these oily components can be used alone or two or more can be used in combination.

[0070] The amount of oil is preferably 5% by mass or more and 80% by mass or less, more preferably 10% by mass or more and 60% by mass or less, and even more preferably 20% by mass or more and 50% by mass or less, based on the mass of the emulsified composition.

[0071] [Polyhydric alcohol (component D)] The emulsified composition preferably contains a polyhydric alcohol (also referred to as "component D"). Component D preferably forms an aqueous phase as a continuous phase.

[0072] Examples of polyhydric alcohols include glycerin, diglycerin, 1,3-butylene glycol, dipropylene glycol, 1,3-propanediol, polyglycerin, maltitol, methyl gluceth-10, methyl gluceth-20, isopentyl diol, pentylene glycol, and propylene glycol.

[0073] The amount of polyhydric alcohol is preferably 0.1% by mass or more and 50% by mass or less, more preferably 0.5% by mass or more and 20% by mass or less, and even more preferably 1% by mass or more and 10% by mass or less, based on the mass of the emulsified composition.

[0074] A moisturizing sensation can be felt when the amount of polyhydric alcohol is 1% by mass or more. By keeping the amount of polyhydric alcohols below 50% by mass, stickiness can be reduced.

[0075] [Water (Component E)] The emulsified composition preferably contains water (also referred to as "component E"). Component E preferably forms an aqueous phase as a continuous phase.

[0076] The amount of water is preferably 1% by mass or more and 99% by mass or less, more preferably 5% by mass or more and 95% by mass or less, and even more preferably 10% by mass or more and 90% by mass or less, based on the mass of the emulsified composition.

[0077] [Electrolyte (component F)] The emulsified composition preferably contains an electrolyte (also referred to as "component F"). Component F can adjust the pH of the emulsified composition.

[0078] Examples of electrolytes include ascorbic acid derivatives such as ascorbic acid, ascorbic acid phosphate ester, ascorbic acid sulfate ester, and ascorbic acid glucoside; tranexamic acid or its derivatives; whitening agents such as niacinamide and kojic acid; glycyrrhizic acid or its derivatives; glycyrrhetinic acid or its derivatives; salicylic acid or its derivatives; anti-inflammatory agents such as alum; urea or its derivatives; humectants such as amino acids or their derivatives, or their metal salts; pH adjusters such as organic compounds such as lactic acid, phosphoric acid, citric acid, pyrosulfite, and pyrrolidone carboxylic acid, or their metal salts; inorganic salts such as sodium chloride and magnesium chloride; and chelating agents such as ethylenediaminetetraacetic acid (EDTA), ethylenetriaminepentaacetic acid (DTPA), ethylene glycol bis(2-aminoethyl ether)tetraacetic acid, 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP), ethylenediaminetetra(methylenephosphonic acid), or salts thereof. Potassium, sodium, magnesium, calcium, and the like can be used as metal salts in the aforementioned salt.

[0079] The amount of electrolyte is preferably 0.01% by mass or more and 10% by mass or less, and more preferably 0.05% by mass or more and 5% by mass or less, based on the mass of the emulsified composition.

[0080] [Other ingredients (Ingredient G)] The emulsified composition may contain other components depending on its intended use. Examples of other components include dispersants, anionic surfactants, amphoteric surfactants, nonionic surfactants, cationic surfactants, humectants, thickeners, foaming agents, metal ion chelating agents, preservatives, antibacterial agents, anti-dandruff agents, anti-itch agents, UV absorbers, UV scattering agents, whitening agents, blood circulation promoters, local irritants, nutrients, female hormones, hair follicle activators, anti-inflammatory agents, astringents, cooling agents, antihistamines, antioxidants, sebum inhibitors, exfoliating and dissolving agents, and cosmetic colorants. [Examples]

[0081] The present invention will be described in more detail below using examples and comparative examples, but the technical scope of the present invention is not limited thereto.

[0082] The various values ​​in the examples may be preferred lower or upper limits in the embodiments of the present invention. Alternatively, two similar values ​​in the examples may be combined as appropriate to form a preferred numerical range.

[0083] <Measurement and Evaluation> The various measurements and evaluations in this embodiment were performed as follows.

[0084] [Viscosity measurement] The viscosity of emulsified compositions stored at 25°C the day after preparation, or emulsified compositions stored at 50°C for one month, was measured using a Type B viscometer (BL type viscometer, manufactured by Toki Sangyo Co., Ltd.) equipped with a No. 3 rotor, under the conditions of a measurement temperature of 25°C and a rotor rotation speed of 6 rpm. Viscosity was taken as the reference value 60 seconds after the start of measurement.

[0085] [Measurement of emulsion particle size] The emulsion particle size (volume-average particle size) of the emulsion composition stored at 25°C the day after preparation, or the emulsion composition stored at 50°C for one month, was measured using a laser diffraction particle size analyzer (LA-960, Horiba, Ltd.).

[0086] [Measuring pH] The pH of the emulsified composition stored at 25°C the day after preparation, or the emulsified composition stored at 50°C for one month, was measured using a pH meter (D51 pH METER, Horiba, Ltd.).

[0087] [Evaluation of emulsification status after storage at 50°C for 1 month] The appearance of the emulsified composition stored at 25°C the day after preparation and the emulsified composition stored at 50°C for one month were visually observed to evaluate the change in the emulsification state after one month of storage at 50°C. The evaluation criteria are as follows. (Evaluation Criteria) ○: No change from the day after preparation. △: Creaming or gelling occurs. ×: Phase separation occurs

[0088] [Evaluation of usability and feel] Using the emulsified composition of Reference Example 1 as a control, the emulsified composition stored at 25°C the day after preparation was evaluated from the perspective of "fresh texture." Sensory evaluation was conducted by a panel of 10 people, and the average value was calculated. The evaluation criteria are as follows. (Evaluation Criteria) 3: Equivalent to Reference Example 1 2: Although inferior to example 2, it's acceptable. 1: Has lint-forming properties

[0089] <Preparation of Emulsified Composition> Emulsified compositions containing the components listed in Tables 1 to 4 were prepared. Specifically, component B (water-soluble natural polymer) was dispersed in component E (purified water) in the first container. Component A (dilauroyl glutamate lysine sodium), component D (polyhydric alcohol), and component G (other component) were then added to the first container and stirred until homogeneous to create an aqueous phase. Component C (oil) was placed in the second container to form the oil phase. The aqueous and oil phases were heated to 80°C, and the oil phase was gradually added to the agitated aqueous phase. After the addition of the oil phase was complete, the mixture was emulsified using a homomixer at 6000 rpm for 5 minutes, and then air-cooled to room temperature. An oil-in-water emulsion composition was prepared by adding the same amount of water that evaporated during the aforementioned stirring at 80°C, adding component F (electrolyte) to adjust the pH to 7, and then defoaming.

[0090] Various measurements and evaluations were performed on the obtained emulsified compositions. The results are shown in Tables 1 to 4.

[0091] [Table 1]

[0092] [Table 2]

[0093] [Table 3]

[0094] [Table 4]

Claims

1. Acyl group-containing amino acids and / or salts thereof, At least two types of water-soluble natural polymers, oil and An emulsified composition containing the following:

2. The water-soluble natural polymer comprises at least two selected from the group consisting of sclerotium gum, carrageenan, sodium alginate, glucomannan, tamarind gum, locust bean gum, gellan gum, carboxymethylcellulose, hydroxypropylmethylcellulose, guar gum, xanthan gum, and gum arabic. The emulsified composition according to claim 1.

3. The total amount of the water-soluble natural polymer is 0.3% by mass or more and 2.0% by mass or less, based on the mass of the emulsified composition. The emulsified composition according to claim 1.

4. The amount of synthetic polymer is less than 0.1% by mass, based on the mass of the emulsified composition. The emulsified composition according to claim 1.

5. Free from synthetic polymers, The emulsified composition according to claim 1.

6. It also contains polyhydric alcohols, The emulsified composition according to claim 1.

7. It contains even more water, The emulsified composition according to claim 1.

8. It also contains electrolytes, The emulsified composition according to claim 1.

9. The acyl group-containing amino acid and / or salt thereof is represented by the following general formula (1): 【Chemistry 1】 (In formula (1), R 1 and R 2 Each of these is independently a saturated or unsaturated linear or branched hydrocarbon group. M 1 M 2 , and M 3 Each of these is independently a hydrogen atom, an alkali metal, an alkaline earth metal, an organic or inorganic amine, a basic amino acid, choline, aluminum, or zinc. n 1 and n 2 is either 0 and 2, or 2 and 0. n 3 and n 4 is either 0 and 2 or 2 and 0) The emulsified composition according to claim 1.

10. The acyl group-containing amino acid and / or its salt is dilauroyl glutamate lysine salt. The emulsified composition according to claim 1.

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