Emulsified cosmetic

Abstract

The present application provides an emulsified cosmetic which is stable even at high and low temperatures, and is excellent in preservative property and appearance, the emulsified cosmetic containing (A) acyl amino acid ester, (B) lecithin, (C) polyol having 5 or less carbon atoms, and (D) buffer containing carboxylic acid having 3 or more carbon atoms, wherein, relative to the total weight of the emulsified cosmetic, (A) is contained at 0.1 to 20% by weight, (B) is contained at 0.05 to 10% by weight, and (C) is contained at 0.5 to 20% by weight, the emulsified cosmetic has a carboxylate ion content of 0.5 to 10 mmol, and has a pH of 3 to 8.

Description

Technical Field

[0001] This invention relates to emulsified cosmetics with excellent stability and preservation during storage from low to high temperatures, and a method for manufacturing the same. Background Technology

[0002] Emulsified cosmetics that can provide skin with moisturizing and barrier functions are widely used. Furthermore, due to the advancement of nanoemulsification technology in recent years, various emulsified cosmetics containing fine emulsified particles with excellent permeability and user experience have been developed.

[0003] For example, there are known emulsified cosmetics that continuously provide a moisturizing effect close to that of the skin itself, using amino acid-based oils (Patent Documents 1 and 2).

[0004] However, emulsified cosmetics are prepared by emulsifying water and oil, and therefore their structure has a problem of stability over time. As a solution to this problem, it has been reported to improve stability over time by adding 1,2-hexanediol to oily components or lecithin, polyglycerol laurate in a specific ratio and emulsifying them. However, it is known that if the amount of 1,2-hexanediol exceeds 2.5% by weight, the stability over time or the user experience will deteriorate (Patent Document 3).

[0005] On the other hand, cosmetics that do not contain preservatives are currently very popular, creating a demand for emulsified cosmetics that can provide preservative properties through means other than adding preservatives.

[0006] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2006-089420, Patent Document 2: WO2023 / 085272, Patent document 3: Japanese Patent Application Publication No. 2013-56858. Summary of the Invention

[0007] The problem that the invention aims to solve Therefore, the object of the present invention is to provide an emulsified cosmetic that is stable even at high and low temperatures, has excellent preservative properties, and provides a superior user experience.

[0008] Methods for solving problems In order to solve the above-mentioned problems, the inventors conducted in-depth research and found that in emulsified cosmetics containing N-acyl-L-glutamic acid diester, if the concentration of preservative polyol is increased to the level that can exert the preservative effect, the stability will actually be worse. However, it was found that by using pentylene glycol in combination with citrate buffer, both preservative and stability can be taken into account. Further research was conducted, and the present invention was completed.

[0009] That is, the present invention relates to the following.

[0010] [1] Emulsified cosmetics, which contain: (A) Acyl amino acid ester, (B) Lecithin, (C) Polyols with 5 or fewer carbon atoms, and (D) Buffer solution containing carboxylic acids with 3 or more carbon atoms; Among them, relative to the total weight of the emulsified cosmetic, it contains 0.1~20% by weight of (A), 0.05~10% by weight of (B) and 0.5~20% by weight of (C), the carboxylate ion content of the emulsified cosmetic is 0.5~10 mmol, and the pH is 3~8.

[0011] [2-1] According to the emulsified cosmetic described in [1], (A) the acyl amino acid ester is an acyl acidic amino acid ester.

[0012] [2-2] According to the emulsified cosmetic described in [1], wherein (A) the acyl amino acid ester is an acyl glutamate ester.

[0013] [2-3] According to the emulsified cosmetic described in [1], wherein (A) the acyl amino acid ester is an acyl glutamate diester.

[0014] [2-4] According to the emulsified cosmetic described in [1], wherein (A) the acyl amino acid ester is N-lauroyl-L-glutamic acid di(phytosterol / octyldodecyl) ester.

[0015] [3] The emulsified cosmetic according to any one of [1] to [2-4], wherein the polyol (C) having 5 or fewer carbon atoms is pentanediol.

[0016] [4] The emulsified cosmetic according to any one of [1] to [3], wherein (D) the carboxylic acid having 3 or more carbon atoms is citric acid.

[0017] [5] An emulsified cosmetic according to any one of [1] to [4], wherein (B) lecithin is hydrogenated lecithin.

[0018] [6] The emulsified cosmetic according to any one of [1] to [5] further contains (E) polyglycerol fatty acid ester.

[0019] [7] The emulsified cosmetic according to any one of [1] to [6], wherein (A) further contains N-lauroyl-L-glutamic acid di(phytosterol / octyldodecyl / behenol) ester.

[0020] [8] The emulsified cosmetic according to any one of [1] to [7], wherein the average particle size of the emulsified particles of the emulsified cosmetic is 90 to 200 nm.

[0021] [9] A method for manufacturing an emulsified cosmetic, comprising: a step of uniformly mixing an oil phase component containing (A) an acyl amino acid ester and (B) lecithin; adding an aqueous phase component containing (C) a polyol having 5 or fewer carbon atoms and (D) a carboxylic acid having 3 or more carbon atoms to the oil phase component and mixing them; and a step of emulsifying the mixture obtained by the above steps under high pressure. The addition amount relative to the total weight of the emulsified cosmetic is (A) 0.1~20% by weight, (B) 0.05~10% by weight and (C) 0.5~20% by weight, the carboxylate ion content of the emulsified cosmetic is 0.5~10 mmol, and the pH is 3~8.

[0022] [10-1] According to the manufacturing method described in [9], wherein (A) the acyl amino acid ester is an acyl acidic amino acid ester.

[0023] [10-2] According to the manufacturing method described in [9], wherein (A) the acyl amino acid ester is an acyl glutamate ester.

[0024] [10-3] According to the manufacturing method described in [9], wherein (A) the acyl amino acid ester is an acyl glutamate diester.

[0025] [10-4] According to the manufacturing method described in [9], wherein (A) the acyl amino acid ester is N-lauroyl-L-glutamic acid di(phytosterol / octyldodecyl) ester.

[0026]

[11] The manufacturing method according to any one of [9] to [10-4], wherein the polyol (C) having 5 or fewer carbon atoms is pentanediol.

[0027]

[12] The manufacturing method according to any one of [9] to

[11] , wherein (D) the carboxylic acid having 3 or more carbon atoms is citric acid.

[0028]

[13] The manufacturing method according to any one of [9] to

[12] , wherein (B) lecithin is hydrogenated lecithin.

[0029]

[14] The manufacturing method according to any one of [9] to

[13] further includes the step of adding (E) polyglycerol fatty acid ester to the aqueous phase component.

[0030]

[15] The manufacturing method according to any one of [9] to

[14] , wherein (A) further contains N-lauroyl-L-glutamic acid di(phytosterol / octyldodecyl / behenol) ester.

[0031]

[16] The manufacturing method according to any one of [9] to

[15] , wherein the average particle size of the emulsified particles of the emulsified cosmetic is 90 to 200 nm.

[0032]

[17] A cosmetic product containing an emulsified cosmetic product according to any one of [1] to [8].

[0033]

[18] A method for manufacturing cosmetics, comprising the step of adding an emulsified cosmetic according to any one of [1] to [8].

[0034]

[19] An emulsified cosmetic obtained by any one of the manufacturing methods described in any one of [9] to

[16] .

[0035]

[20] Cosmetics, which are obtained by the manufacturing method described in

[18] .

[0036] The effects of the invention According to the present invention, an emulsified cosmetic containing acyl amino acid esters can be provided, exhibiting excellent stability and preservative properties.

[0037] In addition, according to the present invention, emulsified cosmetics that do not require the addition of preservatives can be provided. Detailed Implementation

[0038] This invention relates to emulsified cosmetics (also referred to as emulsified cosmetics of this invention), which contain (A) acyl amino acid esters, (B) lecithin, (C) polyols with 5 or fewer carbon atoms and (D) a buffer solution containing carboxylic acids with 3 or more carbon atoms, wherein, relative to the total weight of the emulsified cosmetic, it contains 0.1 to 20% by weight of (A), 0.05 to 10% by weight of (B) and 0.5 to 20% by weight of (C), the carboxylic acid ion content (moles) of the emulsified cosmetic is 0.5 to 10 mmol, and the pH is 3 to 8.

[0039] In the emulsified cosmetic of the present invention, the number of carbon atoms in the acyl amino acid ester contained as ingredient (A) is preferably 10 to 30, more preferably 12 to 18. Furthermore, the acyl group can be saturated or unsaturated. For example, 2-ethylhexanoyl, lauroyl, myristoyl, palmitoyl, stearoyl, behenoyl, oleoyl, isostearoyl, linolenic acid, etc., are preferred, myristoyl and lauroyl are more preferred, and lauroyl is even more preferred. Additionally, the acyl group can also be derived from mixed fatty acids, preferably coconut oil fatty acid ester, palm oil fatty acid ester, palm kernel oil fatty acid ester, sunflower seed oil fatty acid ester, and macadamia seed oil fatty acid ester.

[0040] In addition, alcohol residues that constitute esters in N-acyl amino acid esters include, for example, octyl, lauryl, cetyl, stearyl, isostearyl, behenyl, octyl dodecyl, campesteryl or sitosterol and other phytosterol groups, cholesterol groups, decyl tetradecyl, etc.

[0041] The amino acid portion of the N-acyl amino acid ester can include acidic amino acids, neutral amino acids, and basic amino acids, with acidic amino acids and neutral amino acids being preferred, and acidic amino acids being more preferred. More specifically, glutamic acid, aspartic acid, alanine, arginine, glycine, N-methylalanine, histidine, serine, threonine, and sarcosine are preferred, with glutamic acid, aspartic acid, alanine, N-methylalanine, and sarcosine being more preferred, and glutamic acid being even more preferred.

[0042] In addition, N-acyl amino acid esters can be categorized as monoesters and diesters. Examples of monoesters include N-lauroylsarcosine ester. Examples of diesters include N-lauroylglutamate diester and N-acylaspartate diester, with N-lauroylglutamate diester being preferred. The alcohol residues present in one molecule of diester can be the same or different, and preferably two or more.

[0043] In this invention, examples of N-acyl amino acid diesters include N-lauroyl-L-glutamate di(phytosterol / octyldodecyl) ester, N-lauroyl-L-glutamate di(phytosterol / octyldodecyl / behenol) ester, N-lauroyl-L-glutamate di(cholesterol / octyldodecyl) ester, and N-lauroyl-L-glutamate di(cholesterol / octyldodecyl / behenol) ester.

[0044] In this invention, (A) can be synthesized and used by known chemical synthesis methods. For example, N-lauroyl-L-glutamic acid di(phytosterol / 2-octyldodecyl) ester can be a commercially available product (ELDEW (registered trademark) PS-203) provided by Ajinomoto Co., Ltd., etc., and N-lauroyl-L-glutamic acid di(phytosterol / behenol / 2-octyldodecyl) ester can be a commercially available product (ELDEW (registered trademark) PS-306) provided by Ajinomoto Co., Ltd., etc.

[0045] In this invention, as (A), one or more of them may be used in combination. Examples of (A) include N-lauroyl-L-glutamate di(phytosterol / octyldodecyl) ester, N-lauroyl-L-glutamate di(phytosterol / octyldodecyl / behenol) ester, N-lauroyl-L-glutamate di(cholesterol / octyldodecyl) ester, N-lauroyl-L-glutamate di(cholesterol / octyldodecyl / behenol) ester, and N-lauroylsarcosine isopropyl ester, preferably N-lauroyl... The esters are N-lauroyl-L-glutamate di(phytosterol / 2-octyldodecyl) ester, N-lauroyl-L-glutamate di(phytosterol / behenol / 2-octyldodecyl) ester, N-lauroyl-L-glutamate di(cholesterol / octyldodecyl) ester, and N-lauroyl-L-glutamate di(cholesterol / octyldodecyl / behenol) ester, more preferably N-lauroyl-L-glutamate di(phytosterol / 2-octyldodecyl) ester. Additionally, as in (A), N-lauroyl-L-glutamate di(phytosterol / 2-octyldodecyl) ester and N-lauroyl-L-glutamate di(phytosterol / behenol / 2-octyldodecyl) ester can be combined.

[0046] For example, when component (A) contains N-lauroyl-L-glutamic acid di(phytosterol / 2-octyldodecyl) ester (A-1) and N-lauroyl-L-glutamic acid di(phytosterol / behenol / 2-octyldodecyl) ester (A-2), the weight ratio of (A-1):(A-2) is not particularly limited as long as it does not impair the effect of the present invention, and is usually 1:0.1 to 10, preferably 1:0.2 to 5.

[0047] The content of component (A) in the emulsified cosmetic of the present invention is typically 0.1% to 20% by weight, preferably 0.5% to 10% by weight, and more preferably 1% to 10% by weight, relative to the total weight of the emulsified cosmetic.

[0048] The lecithin contained as component (B) in the emulsified cosmetic of the present invention is a lipid mixture containing phospholipids such as phosphatidylcholine, and examples include soybean lecithin obtained from soybeans and egg yolk lecithin obtained from egg yolks.

[0049] From the perspective of the oxidative stability of emulsified cosmetics, hydrogenated lecithin such as hydrogenated soybean lecithin and hydrogenated egg yolk lecithin is preferred.

[0050] In the emulsified cosmetic of the present invention, lecithin can be used alone or in combination with two or more types.

[0051] In this invention, the lecithin mentioned above can be extracted and purified from soybeans or egg yolks, or commercially available products provided by various companies can be used.

[0052] The content of component (B) in the emulsified cosmetic of the present invention is typically 0.05% to 10% by weight relative to the total weight of the emulsified cosmetic, preferably 0.1% to 5% by weight, and more preferably 0.5% to 3% by weight.

[0053] The polyol containing 5 or fewer carbon atoms as component (C) in the emulsified cosmetic of the present invention is a compound having 5 or fewer carbon atoms and having 2 or more hydroxyl groups (-OH).

[0054] Examples of polyols with 5 or fewer carbon atoms include glycerol, propylene glycol, 1,3-butanediol, pentanediol (1,2-pentanediol), ethylene glycol, and diethylene glycol. Among these, pentanediol, a diol with two hydroxyl groups, is preferred.

[0055] Pentylene glycol can be manufactured using known methods or commercially available products from various companies.

[0056] From a preservative viewpoint, the content of component (C) in the emulsified cosmetic of the present invention, relative to the total weight of the emulsified cosmetic, is generally 0.5% by weight or more, preferably 1% by weight or more, more preferably 2% by weight or more, further preferably 2.5% by weight or more, particularly preferably 3% by weight or more, and most preferably 4% by weight or more. The upper limit of the content is 20% by weight or less, 10% by weight or less, more preferably 8% by weight or less, and further preferably 7.5% by weight or less.

[0057] More specifically, it is typically 0.5% to 20% by weight, preferably 1% to 10% by weight, more preferably 2% to 8% by weight, even more preferably 2.5% to 7.5% by weight, particularly preferably 3% to 7.5% by weight, and most preferably 4% to 7.5% by weight.

[0058] Examples of carboxylic acids containing a carboxylic acid having 3 or more carbon atoms that are included as component (D) in the emulsified cosmetic of the present invention include oxalic acid, citric acid, tartaric acid, and malic acid. From the viewpoint of high-temperature stability, citric acid buffer is more preferred. The citric acid buffer may contain citric acid and citrate. Examples of salts included in the buffer include lithium salts, sodium salts, and potassium salts, with sodium salts being preferred, such as trisodium citrate dihydrate.

[0059] Buffer solutions containing carboxylic acids with 3 or more carbon atoms can be prepared to a concentration typically of 0.1–10 mol / L, preferably 0.1–5 mol / L, with a target pH typically of pH 3–8, preferably pH 4.5–6.5.

[0060] More specifically, in the case of citrate buffer, a buffer solution prepared typically of 0.1 to 10 mol / L, preferably 0.1 to 5 mol / L, with a target pH typically of pH 3 to 8, preferably pH 4.5 to 6.5 can be used.

[0061] Citrate buffer can be prepared by known methods. For example, a 0.1 mol / L citrate buffer at pH 5 can be prepared by mixing 35 mL of 0.1 mol / L citric acid and 65 mL of 0.1 mol / L sodium citrate, but is not limited to this method.

[0062] The content (in moles) of carboxylate ions in the emulsified cosmetic of the present invention is usually 0.5 to 10 mmol, preferably 1 to 10 mmol, and more preferably 1 to 8 mmol.

[0063] More specifically, the citrate ion content (in moles) in the emulsified cosmetic of the present invention is generally 0.5 to 10 mmol, preferably 1 to 10 mmol, and more preferably 1 to 8 mmol.

[0064] It should be noted that, for example, regarding citrate buffer, it can be mixed as a citrate buffer, or the components that make up the citrate buffer, such as citric acid and sodium citrate, can be mixed separately.

[0065] The pH of the emulsified cosmetic of the present invention is typically 3 to 8, preferably 4.5 to 7.5, and more preferably 4.5 to 6.5.

[0066] It should be noted that the pH of the emulsified cosmetic of the present invention can be determined by the glass electrode method in accordance with the provisions of Japanese Industrial Standard (JIS) Z 8802:2011, the 17th edition of the Japanese Pharmacopoeia General Test Method 2.54 pH Test Method, etc.

[0067] The emulsified cosmetic of the present invention may also contain (E) polyglycerol fatty acid esters. The polyglycerol fatty acid esters contained as (E) components are polymers of glycerol and esters of fatty acids. For the purposes of the present invention, hydrophilic polyglycerol fatty acid esters, such as polyglycerol with an average degree of polymerization of about 6 to 10 and monoesters of fatty acids with about 12 to 18 carbon atoms, are preferred. More preferably, polyglycerol fatty acid esters with an HLB (Hydrophilic-Lipophilic Balance) value of 14 to 17 are preferred.

[0068] Examples of such polyglycerol fatty acid esters include decaglycerol monolaurate, decaglycerol monomyristate, and decaglycerol monostearate, with decaglycerol monolaurate being a preferred example.

[0069] In the emulsified cosmetic of the present invention, one type of polyglycerol fatty acid ester may be used alone, or two or more types may be used in combination.

[0070] In this invention, the aforementioned polyglycerol fatty acid esters can be chemically synthesized according to known manufacturing methods, or commercially available products provided by various companies can be used.

[0071] The content of component (E) in the emulsified cosmetic of the present invention is typically 0.01% to 10% by weight relative to the total weight of the emulsified cosmetic, preferably 0.05% to 5% by weight, and more preferably 0.1% to 3% by weight.

[0072] In the emulsified cosmetic of the present invention, the content ratio of component (B) to component (A), i.e. (A):(B), by weight, is generally 1:0.0025 to 100, preferably 1:0.01 to 10, and more preferably 1:0.05 to 3.

[0073] In the emulsified cosmetic of the present invention, the content ratio of component (C) to component (A), i.e. (A):(C), by weight, is generally 1:0.025 to 200, preferably 1:0.1 to 20, and more preferably 1:0.2 to 8.

[0074] In the emulsified cosmetic of the present invention, the content ratio of component (E) to component (A), i.e. (A):(E), by weight, is generally 1:0.0005 to 100, preferably 1:0.005 to 10, and more preferably 1:0.01 to 3.

[0075] The emulsified cosmetic of the present invention may contain, in addition to the ingredients (A) to (E) mentioned above, general additives added to skin topical agents or cosmetics, without impairing the characteristics of the present invention.

[0076] Examples of such additives include hydrophilic solvents such as water, polyols other than (C), and lower alcohols (ethanol, isopropanol, etc.); hydrophilic matrices such as gelatin and polyethylene glycol; animal and vegetable oils (olive oil, soybean oil, camellia oil, sesame oil, peanut oil, cocoa butter, tallow, lard, etc.); waxes (carnauba wax, beeswax, jojoba oil, etc.); aliphatic alcohols (octyldodecyl alcohol, cetyl alcohol, stearyl alcohol, etc.); and fatty acids (oleic acid, palmitic acid, etc.). Oily matrices such as stearic acid, hydrocarbon oils (squalane, white petrolatum, liquid paraffin, ceresin, microcrystalline wax, etc.), propylene glycol alginate, sodium dioctyl sulfosuccinate, povidone, etc., and polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ethers (polyoxyethylene oil-based ethers, etc.), and polyoxyethylene dehydrated sorbitol fatty acid esters (polyoxyethylene dehydrated sorbitol monolaurate, polyoxyethylene dehydrated sorbitol monostearate, polyoxyethylene dehydrated sorbitol monostearate, etc.). Surfactants or emulsifiers other than lecithin and polyglycerol fatty acid esters, such as glycerol monooleate, fatty acid glycerides (glycerol monostearate, etc.), and sucrose fatty acid esters; thickeners such as carboxyvinyl polymers, sodium polyacrylate, xanthan gum, carboxymethyl cellulose, hydroxypropyl cellulose, and polyvinyl alcohol (partial saponification); stabilizers such as sodium edetate, sorbitol, thymol, and polyoxyethylene polyoxypropylene glycol; antioxidants such as ascorbic acid, sodium isoascorbate, tocopheryl acetate, and butylated hydroxytoluene; preservatives such as sorbic acid, sodium dehydroacetate, methylparaben, propylparaben, butylparaben, and phenoxyethanol; pH adjusters such as hydrochloric acid, acetic acid, sodium acetate, potassium hydroxide, sodium hydroxide, and sodium hydrogen phosphate; skin conditioning agents (trimethylglycine, lactic acid, pyrrolidone carboxylic acid, amino acids and their salts, etc.); pigments, dyes, and fragrances.

[0077] One or more of the above additives may be used as needed.

[0078] The particle size (average particle size) of the emulsified particles in the emulsified cosmetic of the present invention serves as an indicator of emulsification stability or appearance, representing the state of emulsification. Generally, the smaller the particle size, the more stable the emulsified cosmetic and the greater its transparency, providing a cosmetic with an aesthetically pleasing appearance. On the other hand, if the particle size is too small, a tendency towards instability may sometimes be observed.

[0079] The emulsified particles of the emulsified cosmetic of the present invention typically have a particle size of 90-200 nm, preferably 90-180 nm, and more preferably 90-170 nm.

[0080] It should be noted that the particle size of the emulsified particles in the emulsified cosmetic of the present invention can be determined by appropriately diluting the emulsified cosmetic with purified water as needed, and then measuring the particle size at 25°C using a particle size measuring device based on dynamic light scattering.

[0081] As described above, if the particle size is reduced, the emulsion becomes more stable, the transparency increases, and the transmittance also increases. Therefore, the transmittance of the emulsified cosmetic of the present invention can also be used as an indicator of stability. It is usually 30-90%, preferably 35-90%, and more preferably 45-90%.

[0082] It should be noted that the transmittance of the emulsified cosmetic of this invention refers to the transmittance (%) of light at a wavelength of 660 nm, measured at 25°C with a path length of 1 cm after appropriate dilution of the emulsified cosmetic with purified water as needed. The transmittance can be measured using a spectrophotometer.

[0083] The emulsified cosmetic of the present invention can be manufactured by a general emulsification method, for example, by heating or heating an oil phase component containing the above-mentioned components (A) and (B) and a lipophilic additive added as needed, an aqueous phase component containing the above-mentioned components (C) and (D) dissolved in water, a component (E) added as needed, and a hydrophilic additive added as needed, and then emulsifying the oil phase component and the aqueous phase component by stirring and mixing.

[0084] In order to produce fine emulsified cosmetics with the above-mentioned average particle size, it is preferable to use a high-pressure emulsifier such as a high-pressure homogenizer, microfluidizer, or ultra-high-pressure wet microparticle device for emulsification.

[0085] The emulsified cosmetic of the present invention can be any one of water-in-oil emulsified cosmetics, oil-in-water emulsified cosmetics, etc., and is preferably a water-in-oil emulsified cosmetic.

[0086] In addition, the emulsified cosmetic of the present invention has the form of a microemulsion and can be made into dosage forms such as liquid, emulsion, paste, cream, and gel.

[0087] Specifically, the emulsified cosmetics of the present invention are suitable for direct use as skin topical agents in the form of emulsions, creams, etc., skin cosmetics such as lotions and creams, base makeup cosmetics such as liquid foundation and foundation cream, color makeup cosmetics such as emulsion foundation and cream foundation, body cosmetics such as lotion and moisturizing cream, sunscreen cosmetics such as sunscreen lotion and sunscreen cream, and hair care cosmetics such as hair oil, conditioner, hair treatment cream and leave-in hair treatment cream.

[0088] The emulsified cosmetic of this invention not only exhibits excellent emulsification stability and preservative properties but also boasts an attractive appearance, making it ideally suited for use in cosmetics. Therefore, the emulsified cosmetic of this invention can be used directly as a moisturizing cosmetic, and further, as a raw material for cosmetics.

[0089] In addition, cosmetics containing the emulsified cosmetics of the present invention are also included in the present invention (also referred to as "cosmetics of the present invention").

[0090] That is, the above-mentioned skin topical agents or general additives added to cosmetics can be added to the emulsified cosmetics of the present invention, and can be provided as skin topical agents in the form of emulsions, creams, etc., skin cosmetics such as lotions and creams, base makeup cosmetics such as liquid foundation and foundation cream, color makeup cosmetics such as lotion foundation and cream foundation, body cosmetics such as lotion and moisturizing cream, sunscreen cosmetics such as sunscreen lotion and sunscreen cream, hair care cosmetics such as hair oil, conditioner, hair treatment cream and leave-in hair treatment cream, etc.

[0091] Alternatively, as another implementation, it is also suitable to add active ingredients or general additives to the emulsified cosmetic of the present invention to provide it as a quasi-medicine or a medicine.

[0092] Furthermore, the cosmetics of the present invention can be manufactured simply by adding the emulsified cosmetics of the present invention according to their intended use and using known methods.

[0093] For example, the proportion of the emulsified cosmetic of the present invention in the cosmetic, relative to the total weight of the cosmetic, is generally 0.1% by weight or more, preferably 0.5% by weight or more, more preferably 1% by weight or more, further preferably 2% by weight or more, and particularly preferably 3% by weight or more. The upper limit is 100% by weight or less, preferably 80% by weight or less, more preferably 50% by weight or less, further preferably 40% by weight or less, particularly preferably 30% by weight or less, even more preferably 20% by weight or less, and most preferably 15% by weight or less. Therefore, the content of each component (A) to (D) and (E) of the emulsified cosmetic of the present invention in the obtained cosmetic of the present invention can be calculated considering the above proportions.

[0094] The cosmetics of this invention not only possess excellent emulsification stability and preservative properties but also have an attractive appearance, making them ideal for cosmetic applications. In particular, their excellent moisturizing properties, resulting from their emulsification stability, address skin or hair conditions caused by insufficient moisture, make them suitable for use as moisturizing cosmetics such as moisturizing toners, lotions, creams, gels, masks, or balms; skin conditioning cosmetics such as toners, lotions, creams, gels, masks, or balms; and hair conditioning cosmetics such as hair treatments and conditioners.

[0095] Regarding the term "preservative effect" used in this article, it means that reference can be made to "18th edition of the Japanese Pharmacopoeia, Reference Information G4. Microbial-related Preservative Efficacy Test Methods". <g4-3-170>Define it. For example, in the case of bacteria selected from Escherichia coli (… Escherichia coli ), Pseudomonas aeruginosa ( Pseudomonas aeruginosa Staphylococcus aureus Staphylococcus aureus These three bacteria, as well as Candida ( Candida albicans ), Aspergillus niger ( Aspergillus niger When these two types of fungi were tested for preservation efficacy, they showed preservation efficacy that met the criteria for Class IA preparations (including injections and non-oral preparations such as eye drops / ear drops / nasal drops) as described in the same method. That is, it means that the following conditions are met: [Bacteria] After 7 days: a decrease of more than 1.0 log compared to the inoculated bacterial count. 14 days later: The number of bacteria decreased by more than 3.0 log compared to the inoculated bacterial count. After 28 days: the bacterial count did not increase compared to after 14 days.

[0096] [Fungi] 7 days, 14 days, and 28 days later: No increase in bacterial count compared to inoculation.

[0097] It should be noted that the composition of this application is equivalent to a formulation made with a water-soluble matrix. As a cosmetic ingredient, the possibility of accidental contact with the eyes during processing can be fully anticipated. Therefore, a Class IA formulation (including non-oral preparations such as injections and ear / eye drops) from the Japanese Pharmacopoeia was selected.

[0098] This invention provides a method for manufacturing an emulsified cosmetic (hereinafter also referred to as "the manufacturing method of this invention"), comprising: a step of uniformly mixing an oil phase component containing (A) and (B), adding an aqueous phase component containing (C) and (D) to the oil phase component and mixing them, and a step of emulsifying the mixture obtained by the above steps under high pressure. The addition amount relative to the total weight of the emulsified cosmetic is (A) 0.1~20% by weight, (B) 0.05~10% by weight and (C) 0.5~20% by weight, the carboxylate ion content of the emulsified cosmetic is 0.5~10 mmol, and the pH is 3~8.

[0099] In the manufacturing method of the present invention, the amount of component (A) added relative to the total weight of the emulsified cosmetic is generally 0.1% to 20% by weight, preferably 0.5% to 10% by weight, and more preferably 1% to 10% by weight.

[0100] In the manufacturing method of the present invention, the amount of component (B) added relative to the total weight of the emulsified cosmetic is generally 0.05% to 10% by weight, preferably 0.1% to 5% by weight, and more preferably 0.5% to 3% by weight.

[0101] In the manufacturing method of the present invention, the amount of component (C) added relative to the total weight of the emulsified cosmetic is generally 0.5% to 20% by weight, preferably 1% to 10% by weight, more preferably 2% to 8% by weight, further preferably 2.5% to 7.5% by weight, particularly preferably 3% to 7.5% by weight, and most preferably 4% to 7.5% by weight.

[0102] In the manufacturing method of the present invention, the content of carboxylate ions in the emulsified cosmetic is usually 0.5~10 mmol, preferably 1~10 mmol, and more preferably 1~8 mmol.

[0103] More specifically, the citrate ion content (in moles) in the emulsified cosmetic of the present invention is generally 0.5 to 10 mmol, preferably 1 to 10 mmol, and more preferably 1 to 8 mmol.

[0104] It should be noted that, for example, when adding citrate buffer as (D), it can be added as citrate buffer, or the components that make up citrate buffer, such as citric acid and sodium citrate, can be added separately.

[0105] The pH of the emulsified cosmetic of the present invention is typically 3 to 8, preferably 4.5 to 7.5, and more preferably 4.5 to 6.5.

[0106] The pH of the emulsified cosmetic can be adjusted in the manufacturing method of the present invention by means of component (D) or by a pH adjuster as needed, according to conventional methods.

[0107] It should be noted that the pH of the emulsified cosmetic of the present invention can be determined by glass electrode method in accordance with the provisions of Japanese Industrial Standard (JIS) Z 8802:2011, the 17th edition of the Japanese Pharmacopoeia General Test Method 2.54 pH Test Method, etc.

[0108] The manufacturing method of the present invention may include a step of adding (E) to the aqueous phase component.

[0109] In the manufacturing method of the present invention, the amount of component (E) added relative to the total weight of the emulsified cosmetic is generally 0.01% to 10% by weight, preferably 0.05% to 5% by weight, and more preferably 0.1% to 3% by weight.

[0110] The definitions and preferred ranges of components (A) to (E) are as described above.

[0111] To obtain a homogeneous oil phase by mixing the oil phase components, namely components (A) and (B), and any lipophilic additives added as needed, it is preferable to heat the oil phase components to approximately 70°C to 85°C while mixing. For the aqueous phase components containing components (C), (D), and (E), and any hydrophilic additives added as needed, it is also preferable to heat them to approximately 70°C to 85°C before mixing them with the oil phase.

[0112] In addition, the oil phase and water phase are mixed with a mixer or similar equipment for about 5 to 15 minutes to emulsify them, and then the mixture is cooled to 30°C to 50°C, preferably about 40°C.

[0113] The mixing of the oil and water phases can be carried out using conventional mixers such as mixers with impellers or homogenizers. High-pressure emulsification can be performed using high-pressure emulsifiers such as high-pressure homogenizers, microfluidizers, or ultra-high-pressure wet microparticle atomization devices. High-pressure emulsification can be carried out at 20°C to 90°C, preferably 20°C to 70°C, under a pressure of typically 100MPa to 250MPa, preferably 150MPa to 230MPa, with a pass count of typically 1 to 30, preferably 3 to 20.

[0114] The average particle size of the emulsified particles in the emulsified cosmetic obtained by the manufacturing method of the present invention is typically 90nm~200nm, preferably 90nm~180nm, and more preferably 90nm~170nm.

[0115] The emulsified cosmetic obtained by the manufacturing method of the present invention typically has a permeability of 25-90%, preferably 30-90%, and more preferably 45-90%.

[0116] The emulsified cosmetics obtained by the manufacturing method of the present invention have excellent emulsification stability, appearance and preservative properties at low and high temperatures, and can effectively exert the moisturizing and barrier functions of acyl amino acid esters.

[0117] The emulsified cosmetic obtained by the manufacturing method of this invention is also included in this invention. Such cosmetics have excellent moisturizing properties and can condition the skin or hair, and therefore can be used as moisturizing and skin-conditioning cosmetics.

[0118] The present invention also includes a method for manufacturing a cosmetic having a step of adding the emulsified cosmetic of the present invention (also referred to simply as the method for manufacturing the cosmetic of the present invention).

[0119] In the manufacturing method of the cosmetic of the present invention, the amount of emulsified cosmetic of the present invention added can be varied according to the type or purpose of the cosmetic. Relative to the total weight of the cosmetic, it is generally 0.1% by weight or more, preferably 0.5% by weight or more, more preferably 1% by weight or more, further preferably 2% by weight or more, and particularly preferably 3% by weight or more. The upper limit is 100% by weight or less, preferably 80% by weight or less, more preferably 50% by weight or less, further preferably 40% by weight or less, particularly preferably 30% by weight or less, even more preferably 20% by weight or less, and most preferably 15% by weight or less.

[0120] Other definitions and preferred ranges are as stated above.

[0121] The cosmetics obtained by the manufacturing method of the present invention are also included in the present invention. Because such cosmetics have excellent moisturizing properties and can condition the skin or hair, they can also be used as moisturizing and skin-conditioning cosmetics. Example

[0122] The present invention will be described in more detail below through examples.

[0123] (Experimental Example 1) 1. Preparation of emulsified cosmetics (1) Weigh the components of the oil phase and aqueous phase listed in Table 1 respectively, and dissolve them at 80°C for 10 minutes. In Table 1, the blank column corresponding to the component indicates that the component is not present.

[0124] (2) While adding the aqueous phase to the oil phase at 70°C, use a dispersion mixer at around 1500 rpm to emulsify it.

[0125] (3) After adding all of them, mix them further with a dispersion mixer for about 5 minutes.

[0126] (4) Remove the mixture and cool it to below about 40°C.

[0127] (5) Use a high-pressure emulsifier (Microfluidizer M-110EH, Powrex) to emulsify at a pressure of 200 MPa (approximately 30,000 psi) and 5 passes (fix the inlet temperature of the emulsifier at 35~40℃).

[0128] (6) The substance obtained by filtration of the emulsion using a cellulose ester filter at room temperature is used as an emulsified cosmetic.

[0129] 2. Particle size (average particle size) (1) Sample preparation: The emulsified cosmetic that has been restored to room temperature is diluted with MilliQ water to 1% by weight to prepare the sample.

[0130] (2) Measurement method: The test sample is filled into the PMMA cell and measured using the measuring device (ELS-Z2: Otsuka Electronics) at 25°C for a cumulative number of 70 times. The measured values ​​are judged according to the following standards.

[0131] (3) Judgment criteria: △: Above 180nm 〇: 170nm or higher and lower than 180nm ◎: Below 170nm.

[0132] 3. Transmittance (1) Sample preparation: The emulsified cosmetic that has been restored to room temperature is diluted with MilliQ water to 1% by weight to prepare the sample.

[0133] (2) Measurement method: The test sample was filled into the PMMA cell, and the transmittance of light with a wavelength of 660 nm was measured using a spectrophotometer (SHIMADZU UV-1900) at 25℃ and an optical path length of 1 cm. The measured values ​​were judged according to the following standards.

[0134] (3) Judgment criteria: △: Below 30%, ○: 30% or more but less than 45%, ◎: More than 45%.

[0135] 4. High-temperature stability (1) Sample preparation: Fill a 20mL PET container with about 60-70% emulsified cosmetics, store it in a constant temperature bath at 70℃ for 14 days, and then use the stored sample for testing.

[0136] (2) Evaluation and testing methods: The appearance (melt) of the emulsified cosmetic was visually observed by one professional reviewer, and the high temperature stability was evaluated according to the following evaluation criteria.

[0137] The pH of the sample at 70°C was measured using a pH meter (F-52, Horiba Manufacturing Co., Ltd.).

[0138] (3) Evaluation criteria: 〇: The decrease in pH before and after the test is less than 0.5, and no changes are found in appearance or properties; ×: Situations such as pH decrease of more than 0.5, separation, or changes in other properties were found before and after the experiment.

[0139] 5. Low-temperature stability (1) Sample preparation: Fill a 20mL PET container with about 60-70% of the sample, store it in a constant temperature bath at -5℃ for 14 days, and then use the stored sample for testing.

[0140] (2) Evaluation and measurement methods: The appearance (melting state) shall be visually observed by one professional reviewer, and the low temperature stability shall be evaluated according to the following evaluation criteria.

[0141] The transmittance of the diluted solution obtained by diluting the sample with MilliQ water to 1% by weight at 25°C was measured using a spectrophotometer (SHIMADZU UV-1900) with a path length of 1 cm and a wavelength of 660 nm.

[0142] (3) Evaluation criteria: 〇: The change in transmittance before and after the test is less than 10%, and no changes are found in appearance or properties; ×: A change in transmittance of more than 10% before and after the test, or a situation of consolidation / separation.

[0143] [Table 1] 6. Results As shown in Table 1, the compositions (2A, 7A, 10A) containing citrate buffer and pentanediol exhibit excellent particle size, permeability, and stability. Compositions without citrate buffer cannot avoid pH changes under high-temperature conditions or have inferior properties compared to other compositions. Furthermore, even compositions containing citrate buffer but with 1,2-hexanediol instead of pentanediol, will solidify at low temperatures. Additionally, using acetate buffer, aqueous citric acid solution, sodium dihydrogen phosphate solution, or aqueous acetic acid solution instead of citrate buffer cannot simultaneously achieve the desired physical properties and stability.

[0144] The results above show that emulsification stability is improved in emulsified cosmetics containing ingredients (A) to (D) and in emulsified cosmetics further containing ingredient (E).

[0145] (Experimental Example 2) 1. Sample preparation The test samples were prepared by mixing the components listed in Table 2 using the methods described in Test Examples 1(1) to (3). In Table 1, the blank column corresponding to a component indicates that the component is not present.

[0146] 2. Preservative properties (refer to the 18th edition of the Japanese Pharmacopoeia) (1) Test bacteria: Escherichia coli ( Escherichia coli NBRC 3972) (Ec in the table) Staphylococcus aureus ( Staphylococcus aureus NBRC 13276) (Sa in the table) (2) Preparation of test bacterial suspensions: Each test bacterium was pre-cultured on SCD agar medium at 32.5℃ for 20 hours. The cultured bacterial cells were scraped off with a platinum ring and suspended in sterile physiological saline to prepare approximately 10... 8 The bacterial culture was prepared at a concentration of 100 cells / mL and used as the test solution.

[0147] (3) Inoculation and preservation of bacteria: For each test bacterium, place 20g of sample in a sterile tubular bottle and inoculate with 0.15mL (10 mL per 1g sample). 5 ~10 6 Test bacterial suspensions (number of samples) were collected and stored at 22.5℃. Viable bacterial counts were determined on days 7, 14, 21, and 28.

[0148] (4) Determination of viable count: The SCDLP agar pouring method was used.

[0149] (5) Evaluation criteria ◎: Below 10 1 indivual, 0:10 1 More than 10 but less than 10 3 indivual, △:10 3 More than one.

[0150] [Table 2] 3. Results As shown in Table 2, the composition containing both pentylene glycol and citrate buffer exhibits the best preservation efficacy compared to compositions containing polyols other than pentylene glycol, compositions containing pentylene glycol but not citrate buffer, and compositions containing no polyols.

[0151] (Experimental Example 3) 1. Preparation of emulsified cosmetics Compositions 2A and 1C were prepared using the same preparation method as in Experimental Example 1, with the formulations shown in Table 3. A "-" in the column corresponding to each component indicates that it is not present. The same applies below.

[0152] Composition 2C was prepared according to the preparation methods (1) to (4) shown in Experiment 1 using the formulations shown in Table 3 (without high-pressure emulsification).

[0153] 2. Sensory evaluation of hair Prepare a 1% by weight dilution of compositions 2A, 1C, and 2C, and immerse hair strands cleaned with 10% by weight of SLES aqueous solution for 1 minute.

[0154] After combing the hair, let it dry overnight. Five professional judges will evaluate the smoothness, lightness, moisturization, and fit according to the following standards, and then calculate the average score to determine the final result.

[0155] 3. Evaluation Criteria 7 points: Excellent 6 points: Good. 5 points: Slightly better 4 points: Average 3 points: Slightly poor 2 points: Poor, 1 point: Very poor.

[0156] 4. Judgment Criteria A: Average score of 5 or above B: Average score between 4 and 5. C: Average score between 3 and 4. D: Average score is below 3 points.

[0157] 5. Particle size (average particle size) (1) Sample preparation: The emulsified cosmetic that has been restored to room temperature is diluted with MilliQ water to 1% by weight to prepare the sample.

[0158] (2) Measurement method: The test sample was filled into a PMMA cell and measured using the measuring device (ELS-Z2: Otsuka Electronics) at 25°C for 70 cumulative measurements. It should be noted that 1C was not measured because it did not contain emulsion droplets. In addition, 2C could not be measured because its particle size was too large.

[0159] 6. Results As shown in Table 3, compared with composition 1C which does not contain lauroyl glutamate di(phytosterol / octyldodecyl) ester or composition 2C which has not undergone high-pressure emulsification, composition 2A of this application has a superior effect in suppressing stickiness while improving the smoothness and moisturization of hair.

[0160] [Table 3] (Formula Example 1) Toner 1. Preparation of toner Using the formulation shown in Table 4, A was uniformly mixed at 40°C, and then B and C were added sequentially to obtain a cosmetic lotion. Composition 2A in the table refers to composition 2A used in Test Examples 1-3 above. Composition 2C in the table refers to composition 2C used in Test Example 3 above. PEG refers to polyethylene glycol. The same applies below.

[0161] 2. Sensory evaluation of toner Ten professional reviewers conducted usage tests and evaluated the application of the product based on five criteria: smoothness, ease of application, viscosity, moisturizing feel, and non-stickiness after application. The average score was then used to determine the final product.

[0162] 3. Evaluation Criteria 5 points: Excellent 4 points: Good. 3 points: Average 2 points: Slightly poor 1 point: Poor.

[0163] 4. Judgment Criteria A: Average score of 4 or above B: Average score between 3.5 and 4. C: Average score between 3 and 3.5. D: Average score is below 3 points.

[0164] 5. Results As shown in Table 4, compared with Toner 2, Toner 1 has superior moisturizing effect and a smooth, non-sticky feel. In addition, in the evaluation of one professional reviewer, Toner 1 has superior moisturizing effect and a smooth, non-sticky feel compared with Toner 3 ("-" in the evaluation items in the table indicates that 10 professional reviewers did not give a level 5 evaluation).

[0165] [Table 4] (Formula Example 2) Toner Using the formula shown in Table 5, after uniformly mixing A at 40°C, add B and C in sequence to obtain a toner.

[0166] Compared to lotions 5 and 6, lotion 4 has superior moisturizing effect and a smooth, non-sticky, and hydrating feel.

[0167] [Table 5] (Formulation Example 3) Cream Cosmetics Using the formulation shown in Table 6, dissolve A and B separately by heating to 80°C. While stirring, add B to A. Emulsify using a homogenizer (3000 rpm, 80°C, 10 minutes), and cool to room temperature to obtain a cream cosmetic. In the table, BG represents 1,3-butanediol.

[0168] Compared with creams 2 and 3, the resulting cream cosmetic 1 has a moisturizing feel and excellent skin condition improvement effect.

[0169] [Table 6] (Formula Example 4) Skin Cream Using the formulation shown in Table 7, A and B were uniformly mixed and dissolved at 80°C. While adding B to A, emulsification was performed using a homogenizer (3000 rpm, 80°C, 6 minutes). After cooling to room temperature, C was added to obtain the skin cream. PG stearate indicates an ester of stearic acid and propylene glycol.

[0170] Compared to skincare creams 2 and 3, the resulting skincare cream 1 has a richer texture and superior skin condition improvement effect.

[0171] [Table 7] (Formulation Example 5) Gel Cosmetics Using the formulation shown in Table 8, A, B, and C were uniformly mixed at room temperature. While adding B and C to A, emulsification was performed using a homogenizer (6000 rpm, 75°C). D, E, and F were then added sequentially to the composition to obtain a gel cosmetic. PCA represents pyrrolidone carboxylic acid.

[0172] Compared with gel cosmetics 2 and 3, the resulting gel cosmetic 1 has a superior moisturizing and hydrating feel.

[0173] [Table 8] (Formula Example 6) Facial Mask Infusion Using the formula shown in Table 9, after uniformly dispersing A and B at room temperature, heating and stirring C at 85°C, while adding B and C sequentially to A, stirring was carried out to obtain a homogeneous solution (85°C). While cooling the solution, components D, E, F, and G were added sequentially (45°C) to obtain the mask impregnation solution.

[0174] Compared with mask impregnation solutions 2 and 3, the obtained mask impregnation solution 1 has a higher moisturizing effect and a better skin condition improvement effect.

[0175] [Table 9] (Formulation Example 7) Cream Cosmetics 1. Preparation of Cream Cosmetics Using the formula shown in Table 10, A and B were stirred evenly at 80°C. While adding B to A, emulsification was performed using a homogenizer (5000 rpm, 80°C, 5 minutes). The mixture was cooled while stirring to obtain a cream cosmetic.

[0176] 2. Long-term continuous use test Subjects applied cream cosmetics A and B to their right and left cheeks twice daily, morning and evening, for two weeks. The moisture content of the stratum corneum was measured before and two weeks after application (cream cosmetic C was not measured).

[0177] The determination of stratum corneum moisture content is performed according to the following steps.

[0178] Enter the constant temperature and humidity chamber (temperature 21℃, humidity 40%), wash both faces (test areas) with makeup remover oil, and allow 30 minutes for adaptation. After adaptation, use a Corneometer CM825 (manufactured by Courage+Khazaka) to measure the capacitance value (initial value) of the test area (2cm×2cm).

[0179] The capacitance values ​​obtained from the Corneometer are calculated as the average of 10 measurements taken at each site.

[0180] 3. Judgment Criteria A: The capacitance value changes at a rate of +10% or more. B: The rate of change of capacitance is within the range of +3% to less than +10%. C: The rate of change of capacitance is within the range of -3% to below +3%. D: The rate of change of capacitance is less than -3%.

[0181] 4. Results Compared with cream cosmetic B, the resulting cream cosmetic A has a smooth and moisturizing feel and a superior effect on improving skin condition.

[0182] [Table 10] (Formula Example 8) Hair Treatment Cream Using the formula shown in Table 11, mix and dissolve A and B. While adding B to A, emulsify using a homogenizer (4000 rpm, 80°C, 3 minutes). While stirring, cool and add C to obtain the hair mask. PG represents propylene glycol.

[0183] Compared with hair treatments 2 and 3, the hair treatment cream 1 has a superior effect on hair conditioning, user experience, and improvement of hair condition.

[0184] [Table 11] Industrial availability According to the present invention, an emulsified cosmetic containing acyl amino acid esters can be provided, exhibiting excellent emulsification stability and preservative properties.

[0185] According to the present invention, emulsified cosmetics with little or no added preservatives can be provided.

[0186] This application is based on Japanese Special Application Nos. 2024-044252 and 2024-124987, the contents of which are contained in this specification.

Claims

1. Emulsified cosmetics, which contain: (A) Acyl amino acid ester, (B) Lecithin, (C) Polyols with 5 or fewer carbon atoms, and (D) Buffer solution containing carboxylic acids with 3 or more carbon atoms; in, Relative to the total weight of emulsified cosmetics, The emulsified cosmetic contains 0.1-20% by weight of (A), 0.05-10% by weight of (B) and 0.5-20% by weight of (C), and has a carboxylate ion content of 0.5-10 mmol and a pH of 3-8.

2. The emulsified cosmetic according to claim 1, wherein, (A) The acyl amino acid ester is N-lauroyl-L-glutamic acid di(phytosterol / 2-octyldodecyl) ester.

3. The emulsified cosmetic according to claim 1 or 2, wherein, (C) Polyols with 5 or fewer carbon atoms are pentanediol.

4. The emulsified cosmetic according to claim 1 or 2, wherein, (D) Carboxylic acids with 3 or more carbon atoms are citric acid.

5. The emulsified cosmetic according to claim 1 or 2, wherein, (B) The lecithin is hydrogenated lecithin.

6. The emulsified cosmetic according to claim 1 or 2, further comprising (E) polyglycerol fatty acid ester.

7. The emulsified cosmetic according to claim 2, wherein, (A) also contains N-lauroyl-L-glutamic acid di(phytosterol / octyldodecyl / behenol) ester.

8. The emulsified cosmetic according to claim 1 or 2, wherein, The average particle size of emulsified particles in emulsified cosmetics is 90~200nm.

9. A cosmetic product containing an emulsified cosmetic product according to claim 1 or 2.

10. A method for manufacturing emulsified cosmetics, comprising: The process involves uniformly mixing an oil phase component containing (A) acyl amino acid esters and (B) lecithin, adding an aqueous phase component containing (C) a polyol with 5 or fewer carbon atoms and (D) a carboxylic acid with 3 or more carbon atoms to the oil phase component, and mixing the mixture; and then emulsifying the mixture obtained through the above steps under high pressure. The addition amount relative to the total weight of the emulsified cosmetic is (A) 0.1~20% by weight, (B) 0.05~10% by weight and (C) 0.5~20% by weight, the carboxylate ion content of the emulsified cosmetic is 0.5~10 mmol, and the pH is 3~8.

11. The manufacturing method according to claim 10, wherein, (A) The acyl amino acid ester is N-lauroyl-L-glutamic acid di(phytosterol / 2-octyldodecyl) ester.

12. The manufacturing method according to claim 10 or 11, wherein, (C) Polyols with 5 or fewer carbon atoms are pentanediol.

13. The manufacturing method according to claim 10 or 11, wherein, (D) Carboxylic acids with 3 or more carbon atoms are citric acid.

14. The manufacturing method according to claim 10 or 11, wherein, (B) The lecithin is hydrogenated lecithin.

15. The manufacturing method according to claim 10 or 11, further comprising the step of adding (E) polyglycerol fatty acid ester to the aqueous phase component.

16. The manufacturing method according to claim 11, wherein, (A) also contains N-lauroyl-L-glutamic acid di(phytosterol / octyldodecyl / behenol) ester.

17. The manufacturing method according to claim 10 or 11, wherein, The average particle size of emulsified particles in emulsified cosmetics is 90~200nm.

18. A method for manufacturing a cosmetic, comprising the step of adding an emulsified cosmetic according to claim 1 or 2.

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