Emulsified cosmetics

Abstract

This product provides an emulsified cosmetic that is transparent to semi-transparent in appearance, has an elastic feel when the skin is pressed after application, is non-sticky, and has excellent storage stability. [Solution] The following components (A), (B), (C), (D), and (E): (A) Oils, (B) Nonionic surfactants with HLB 7-20, (C) Anionic surfactant, (D) Niacinamide 2-10% by mass, (E)Water An emulsified cosmetic containing [ingredient name], with an average particle size of 10-200 nm for the emulsified particles.

Description

Technical Field

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

Background Art

[0002] In recent years, cosmetics containing niacinamide have been developed as anti-wrinkle cosmetics. On the other hand, cosmetics with a transparent to semi-transparent appearance are demanded as aesthetically pleasing cosmetics, and transparent to semi-transparent cosmetics containing niacinamide are also being studied For example, Patent Document 1 describes a cosmetic composition having a transparent or semi-transparent appearance in the form of a nano or microemulsion containing oil, a nonionic surfactant with an HLB of 8 to 14, vitamin B3, and water. Further, Patent Document 2 describes a cosmetic composition containing an active substance in salt form, a thickener, water, and a skin care active agent such as a vitamin B3 compound, which has a transparent appearance and whitens the skin, moisturizes, and conditions the skin.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventional cosmetics containing niacinamide have problems in the elasticity of the skin and the lack of stickiness after applying the cosmetics.

Means for Solving the Problems

[0005] The inventors have discovered that by using niacinamide in combination with specific nonionic and anionic surfactants, and by micronizing the emulsion particles, it is possible to obtain an emulsified cosmetic that is transparent to semi-transparent in appearance, has an elastic feel when the skin is pressed after application, is non-sticky, and has excellent storage stability.

[0006] The present invention comprises the following components (A), (B), (C), (D), and (E): (A) Oils, (B) Nonionic surfactants with HLB 7-20, (C) Anionic surfactant, (D) Niacinamide 2-10% by mass, (E)Water This invention relates to an emulsified cosmetic containing [a specific ingredient], wherein the average particle size of the emulsified particles is 10 to 200 nm. Furthermore, the present invention relates to a method for producing the emulsified cosmetic composition, characterized by mixing components (A), (B), (C), (D), and (E) in a high-pressure homogenizer at 50 MPa or higher. [Effects of the Invention]

[0007] The emulsified cosmetic composition of the present invention has fine emulsion particles, is transparent to semi-transparent in appearance, has an elastic feel when the skin is pressed after application, is non-sticky, and has excellent storage stability. [Modes for carrying out the invention]

[0008] The oily component (A) used in this invention is one commonly used in cosmetics and may be a liquid, paste, or solid oily component at 25°C. Liquid oils at 25°C are those that are fluid at 25°C, and examples include hydrocarbon oils, ester oils, ether oils, and silicone oils.

[0009] More specifically, examples of hydrocarbon oils include squalane, liquid paraffin, liquid isoparaffin, light liquid isoparaffin, and heavy liquid isoparaffin. The hydrocarbon oil preferably contains one or more selected from squalane, liquid paraffin, liquid isoparaffin, and light liquid isoparaffin; more preferably contains one or more selected from squalane, liquid paraffin, and liquid isoparaffin; even more preferably contains one or more selected from squalane and liquid isoparaffin; and even more preferably contains squalane.

[0010] Examples of ester oils include monoester oils, diester oils, triester oils, and tetraester oils. Examples of monoester oils include monoesters of aliphatic or aromatic monocarboxylic acids or dicarboxylic acids having 2 to 24 carbon atoms. Specific examples include cetyl 2-ethylhexanoate, cetyl octanoate, isononyl isononanoate, isotridecyl isononanoate, hexyl laurate, isopropyl myristate, octyldodecyl myristate, myristyl myristate, 2-hexyldecyl myristate, isopropyl palmitate, octyl palmitate, 2-hexyldecyl butyl palmitate, isocetyl stearate, isocetyl isostearate, decyl oleate, octyl methoxycinnamate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, 2-ethylhexyl succinate, 2-hexyldecyl adipate, and alkyl benzoates (C12-C15). The monoester oil preferably contains one or more selected from isononyl isononanoate, isotridecyl isononanoate, and octyldodecyl myristate, and more preferably contains one or more selected from isotridecyl isononanoate and octyldodecyl myristate.

[0011] Examples of diester oils include diesters of dicarboxylic acids having 3 to 18 carbon atoms, and di-fatty acid esters of polyhydric alcohols. Specific examples include propylene glycol dicaprylate, neopentyl glycol dicaprate, glycol distearate, propylene glycol diisostearate, glyceryl diisostearate, glyceryl monomyristate monoisostearate, glyceryl di2-heptylundecanoate, di2-ethylhexyl succinate, diisopropyl sebacate, diisostearyl malate, ethylene glycol di2-ethylhexanoate, diisobutyl adipate, di2-hexyldecyl adipate, di-2-heptylundecyl adipate, and di-2-ethylhexyl sebacate. The diester oil preferably contains one or more selected from propylene glycol dicaprylate and neopentyl glycol dicaprate, and more preferably contains neopentyl glycol dicaprate.

[0012] Examples of triester oils include tri-fatty acid esters of polyhydric alcohols with a valency of 3 or higher. Specifically, these include glyceryl trimyristate, glyceryl triisopalmitate, glyceryl tri-2-heptylundecanoate, trimethylolpropane triethylhexanoate, trimethylolpropane trioctanoate, caprylic / capric triglyceride, glyceryl trioleate, glyceryl tri-2-ethylhexanoate, glyceryl triisostearate, and vegetable oils such as olive oil, jojoba oil, macadamia nut oil, meadowfoam oil, castor oil, safflower oil, sunflower oil, avocado oil, canola oil, apricot kernel oil, rice germ oil, and rice bran oil. As the triester oil, it is preferable to contain one or more selected from glyceryl tri(caprylic acid / capric acid), glyceryl tri(2-ethylhexanoic acid), and vegetable oils, more preferably to contain one or more selected from glyceryl tri(caprylic acid / capric acid), glyceryl tri(2-ethylhexanoic acid), olive oil, and jojoba oil, even more preferably to contain one or more selected from glyceryl tri(caprylic acid / capric acid) and olive oil, and even more preferably to contain olive oil. As the ester oil, it is preferable to contain one or more selected from diester oil and triester oil, and more preferably to contain triester oil.

[0013] Examples of the tetraester oil include tetra-fatty acid esters of tetravalent or higher polyhydric alcohols. Specifically, examples include pentaerythrityl tetra(behenic acid / benzoic acid / ethylhexanoic acid), pentaerythrityl tetraethylhexanoic acid, pentaerythrityl tetraoctanoic acid, pentaerythrityl tetra(2-ethylhexanoic acid), and the like.

[0014] Examples of the ether oil include dialkyl ethers. Specifically, examples include dihexyl ether, dicaprylyl ether, cetyl-1,3-dimethylbutyl ether, and the like.

[0015] Examples of the silicone oil include volatile and non-volatile linear dimethylpolysiloxanes such as dimethylpolysiloxane (1 cs), dimethylpolysiloxane (1.5 cs), dimethylpolysiloxane (2 cs), dimethylpolysiloxane (6 cs); branched siloxanes such as methyltrimethicone, tris(trimethylsilyl)methylsilane, tetrakis(trimethylsilyl)silane; cyclic dimethylsiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane; crosslinked methylpolysiloxanes, networked methylpolysiloxanes, methylphenylpolysiloxanes such as methyltrimethicone, diphenylsiloxyphenyltrimethicone, and higher alcohol-modified organopolysiloxanes. The silicone oil preferably contains one or more selected from linear dimethyl polysiloxane and branched siloxane, more preferably contains linear dimethyl polysiloxane, and even more preferably contains non-volatile linear dimethyl polysiloxane.

[0016] As the oil agent that is liquid at 25°C, from the viewpoints of improving the elasticity when pressing the skin after application, reducing the stickiness of the skin after application, and improving the storage stability, it preferably contains one or more selected from hydrocarbon oil, ester oil, ether oil, and silicone oil, more preferably contains hydrocarbon oil and ester oil, even more preferably contains one or more selected from hydrocarbon oil, diester oil, and triester oil, still more preferably contains one or more selected from hydrocarbon oil and triester oil, and most preferably contains hydrocarbon oil.

[0017] Also, as the oil agent in paste or solid form at 25°C, the melting point is preferably 28°C or higher, more preferably 30°C or higher, and even more preferably 32°C or higher. Also, it is preferably 160°C or lower, more preferably 155°C or lower, and even more preferably 150°C or lower. The method for measuring the melting point is according to the second method described in the Raw Material Specifications for Quasi Drugs (2006), General Test Methods, and Melting Point Measurement Method.

[0018] Specific examples of the oil agent in paste or solid form include hydrocarbon oils such as solid paraffin (melting point: 50 - 70°C), microcrystalline wax (melting point: 54 - 102°C), ceresin (melting point: 61 - 95°C), ozokerite (melting point 61 - 90°C), petrolatum (melting point 38 - 60°C), polyethylene wax (melting point: 103 - 120°C), Fischer-Tropsch wax (melting point 108 - 120°C), etc.; Carnauba wax (melting point: 80-86°C), beeswax (melting point: 64°C), candelilla wax (melting point: 68-72°C), rice bran wax (melting point: 70-83°C), jojoba wax (melting point: 55°C), Japan wax (melting point: 55°C), jojoba butter (melting point: 46-54°C), lanolin (melting point: 37-43°C); hydrogenated jojoba oil (melting point: 68°C), hydrogenated castor oil (melting point: 84°C), hydrogenated palm oil (melting point: 65°C), hydrogenated coconut oil (melting point: 70°C), cetyl palmitate (melting point: 50°C), eicosaned behenate Ester oils such as glyceryl acid (melting point: 66°C), tristearin, tribehenin, shea butter (melting point: 36-45°C), dimer dilinoleyl (phytosteryl / isostearyl / cetyl / stearyl / behenyl) (melting point: 38°C), tri(caprylic / caprin / myristic / stearic acid) glyceryl (melting point: 40°C), hydrogenated castor oil laurate (melting point: 51°C), hydrogenated castor oil isostearate (melting point: 47°C), and hydrogenated castor oil monohydroxystearate (melting point: 55-63°C); Ether oils such as batyl alcohol (melting point: 60-70°C) and chymyl alcohol (melting point: 60.5-61.5°C); Higher alcohols such as stearyl alcohol (melting point: 58.0°C) and behenyl alcohol (melting point: 70.5°C); Examples include cholesterol (148°C) and sterols such as phytosterols (135°C).

[0019] As an oil preparation in paste or solid form at 25°C, it is preferable to include one or more selected from hydrocarbon oils, ester oils, higher alcohols, and cholesterols, from the viewpoint of improving elasticity when the skin is pressed after application, reducing stickiness after application, and improving storage stability. It is more preferable to include one or more selected from petrolatum, shea butter, dimer dilinoleic acid (phytosteryl / isostearyl / cetyl / stearyl / behenyl), behenyl alcohol, cholesterol, and phytosterols. It is even more preferable to include one or more selected from dimer dilinoleic acid (phytosteryl / isostearyl / cetyl / stearyl / behenyl), behenyl alcohol, cholesterol, and phytosterols. It is even more preferable to include behenyl alcohol or cholesterol, and especially preferable to include cholesterol.

[0020] Ingredient (A) preferably contains one or more selected from squalane, liquid paraffin, isotridecyl isononanoate, octyldodecyl myristate, caprylic / capric triglyceride, glyceryl tri-2-ethylhexanoate, olive oil, jojoba oil, meadowfoam oil, stearyl alcohol, behenyl alcohol, petrolatum, shea butter, dimer dilinoleyl (phytosteryl / isostearyl / cetyl / stearyl / behenyl), cholesterol, and phytosterols, from the viewpoint of improving elasticity when the skin is pressed after application, reducing stickiness after application, and improving storage stability, and preferably contains one or more selected from squalane, liquid paraffin, isotridecyl isononanoate, octyldodecyl myristate, caprylic / capric triglyceride, glyceryl tri-2-ethylhexanoate, olive oil, jojoba oil, meadowfoam oil, stearyl alcohol, behenyl alcohol, petrolatum, shea butter, dimer dilinoleyl (phytosteryl / isostearyl / cetyl / stearyl / behenyl), cholesterol, and phytosterols. It is more preferable to include one or more selected from olive oil, behenyl alcohol, dimer dilinoleic acid (phytosteryl / isostearyl / cetyl / stearyl / behenyl), cholesterol, and phytosterols; it is even more preferable to include one or more selected from squalane, caprylic / capric triglyceride, glyceryl tri-2-ethylhexanoate, olive oil, behenyl alcohol, dimer dilinoleic acid (phytosteryl / isostearyl / cetyl / stearyl / behenyl), and cholesterol; it is even more preferable to include one or more selected from squalane, olive oil, behenyl alcohol, and cholesterol; and it is especially preferable to include one or more selected from squalane and cholesterol.

[0021] The oily component (A) can be used in combination of one or more types. The content is preferably 0.001 to 4% by mass of the total composition, more preferably 0.01 to 2.5% by mass, and even more preferably 0.1 to 1% by mass, from the viewpoint of making the emulsion particles finer, resulting in a transparent to semi-transparent appearance, improving elasticity when the skin is pressed after application, reducing stickiness after application, and improving storage stability.

[0022] The nonionic surfactant of component (B) has an HLB of 7 to 20. From the viewpoint of making the emulsion particles finer and thus transparent to semi-transparent in appearance, an HLB of 8 to 20 is preferred, HLB of 10 to 18 is more preferred, and HLB of 12 to 16 is even more preferred. Here, HLB (Hydrophilic-Lipophilic Balance) represents the molecular weight of the hydrophilic group portion of the total molecular weight of a surfactant, and is determined by Griffin's formula. Furthermore, when a mixed surfactant is composed of two or more nonionic surfactants, the HLB of the mixed surfactant is determined as follows: The HLB of the mixed surfactant is obtained by averaging the HLB values ​​of each nonionic surfactant based on their blending ratio. Mixed HLB=Σ(HLBx×Wx) / ΣWx HLBx indicates the HLB value of the nonionic surfactant X. Wx represents the mass (g) of the nonionic surfactant X having an HLBx value.

[0023] Examples of such nonionic surfactants include polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ethers, polyoxyethylene fatty acid esters, polyoxyethylene alkanol ethers, polyglycerin fatty acid esters, and sucrose fatty acid esters. Of these, from the viewpoint of making the emulsion particles finer and thus transparent to semi-transparent in appearance, it is preferable to include one or more selected from polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ethers, polyoxyethylene fatty acid esters, and polyglycerin fatty acid esters; more preferably to include one or more selected from polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ethers, and polyglycerin fatty acid esters; and even more preferably to include polyoxyethylene hydrogenated castor oil.

[0024] The nonionic surfactant of component (B) can be used alone or in combination of two or more types. The content is preferably 0.01 to 3% by mass of the total composition, more preferably 0.05 to 2% by mass, and even more preferably 0.3 to 0.9% by mass, from the viewpoint of making the emulsion particles finer, resulting in a transparent to semi-transparent appearance, improving elasticity when the skin is pressed after application, reducing stickiness after application, and improving storage stability.

[0025] The anionic surfactant of component (C) is one that is commonly used in emulsified cosmetics, and examples include carboxylate types such as N-acyl amino acids, fatty acids, alkyl ether carboxylic acids, polyoxyethylene alkyl ether carboxylic acids, acyl lactic acid, N-acyl methylalanine, N-acyl sarcosine, diacyl amino acids and their salts; sulfonate types such as alkanesulfonic acids, α-olefin sulfonic acids, α-sulfo fatty acid methyl esters, acyl isethionic acid, alkyl sulfosuccinic acid, N-acyl methyl taurine and their salts; sulfate types such as alkyl sulfate esters, polyoxyethylene alkyl sulfate esters, alkyl ether sulfates, polyoxyethylene alkyl ether sulfates, fatty acid alkanolamide sulfate esters and their salts; and phosphate types such as alkyl phosphate esters, polyoxyethylene alkyl ether phosphate and their salts. Of these, from the viewpoint of making the emulsion particles finer, thereby making the appearance transparent to semi-transparent and improving storage stability, it is preferable to include one or more selected from N-acyl amino acids, fatty acids, alkyl ether carboxylic acids, diacyl glutamate lysine, alkyl sulfosuccinic acid, N-acylmethyl taurine, alkyl sulfate esters, polyoxyethylene alkyl sulfate esters, polyoxyethylene alkyl ether phosphate and salts thereof; more preferably to include one or more selected from N-acyl amino acids, fatty acids, N-acylmethyl taurine and salts thereof; and even more preferably to include one or more selected from N-acyl amino acids, fatty acids and salts thereof.

[0026] Examples of N-acyl amino acids and their salts include N-acyl glutamates such as N-lauroyl-L-glutamic acid, N-stearoyl-L-glutamic acid, and N-myristoyl-L-glutamic acid, and their salts. N-lauroyl-L-glutamic acid, N-stearoyl-L-glutamic acid, and their salts are preferred, and N-stearoyl-L-glutamic acid and its salts are more preferred. The fatty acids and their salts may be linear or branched, and examples include fatty acids with 12 to 24 carbon atoms such as lauric acid, palmitic acid, stearic acid, and isostearic acid, and their salts. Fatty acids with 14 to 18 carbon atoms and their salts are preferred, and fatty acids with 16 to 18 carbon atoms and their salts are more preferred. Examples of alkyl ether carboxylic acids and their salts include polyoxyethylene lauryl ether acetate and its salts. Examples of diacyl glutamate lysine and its salts include dilauroyl glutamate lysine and its salts. Examples of alkyl sulfosuccinic acid and its salts include di-2-ethylhexyl sulfosuccinic acid and its salts. Examples of N-acylmethyltaurine and its salts include N-myristoyl-N-methyltaurine, N-lauroyl-N-methyltaurine, N-stearoyl-N-methyltaurine and their salts, with N-lauroyl-N-methyltaurine, N-stearoyl-N-methyltaurine and their salts being preferred, and N-stearoyl-N-methyltaurine and their salts being more preferred. Examples of alkyl sulfate esters and their salts include lauryl sulfate and its salts. Examples of polyoxyethylene alkyl sulfate esters and their salts include polyoxyethylene lauryl sulfate and its salts. Examples of alkyl phosphates and their salts include monomyristyl phosphate, monostearyl phosphate, di(C12-C15)pareth-8-phosphate and their salts. Examples of polyoxyethylene alkyl phosphates and their salts include polyoxyethylene oleyl ether phosphate, polyoxyethylene cetyl ether phosphate, polyoxyethylene stearyl ether phosphate, and their salts. Examples of salt structures that make up component (C) include alkali metal salts such as sodium and potassium, basic amino acid salts such as L-arginine, L-histidine, and L-lysine, and alkanolamine salts such as triethanolamine. As for the salt structure constituting component (C), from the viewpoint of making the emulsion particles finer, thereby making the appearance transparent to semi-transparent and improving storage stability, alkali metal salts and basic amino acid salts are preferred, alkali metal salts are more preferred, and sodium salts and potassium salts are even more preferred.

[0027] The anionic surfactant of component (C) can be used alone or in combination of two or more types. From the viewpoint of making the emulsion particles finer, resulting in a transparent to semi-transparent appearance, improving elasticity when the skin is pressed after application, reducing stickiness after application, and improving storage stability, the content is preferably 0.0001 to 1% by mass as salt in the total composition, more preferably 0.001 to 0.5% by mass, and even more preferably 0.03 to 0.2% by mass. Note that the content of component (C) is shown as the amount equivalent to the acid.

[0028] In the present invention, the mass ratio (B) / (C) of component (B) to component (C) is preferably 0.01 to 30000, more preferably 0.1 to 2000, even more preferably 0.3 to 500, even more preferably 0.8 to 200, particularly preferably 1.5 to 30, and preferably 4 to 13, from the viewpoint of making the emulsion particles finer, resulting in a transparent to semi-transparent appearance and improved storage stability.

[0029] The niacinamide component (D) used in this invention is an amide compound of nicotinic acid (niacin). Niacinamide is soluble in water, ethanol, and glycerin, and is a well-known substance included in the vitamin B group. It can be extracted from natural sources (such as rice bran) or synthesized by known methods. Specifically, the niacinamide listed in the 15th edition of the Japanese Pharmacopoeia 2008 can be used.

[0030] The content of component (D) is 2 to 10% by mass of the total composition, preferably 3 to 8% by mass, and more preferably 4 to 6% by mass, from the viewpoint of making the emulsion particles finer, resulting in a transparent to semi-transparent appearance, improving elasticity when the skin is pressed after application, reducing stickiness after application, and improving storage stability.

[0031] In the present invention, the mass ratio (B) / (D) of component (B) to component (D) is preferably 0.001 to 1.5, more preferably 0.006 to 0.67, even more preferably 0.01 to 0.25, even more preferably 0.05 to 0.19, and especially preferably 0.08 to 0.14, from the viewpoint of making the emulsion particles finer, thereby making the appearance transparent to semi-transparent, improving the elasticity when the skin is pressed after application, reducing stickiness on the skin after application, and improving storage stability.

[0032] In the present invention, the mass ratio (C) / (D) of component (C) to component (D) is preferably 0.00001 to 0.5, more preferably 0.000125 to 0.167, even more preferably 0.005 to 0.1, and still more preferably 0.01 to 0.045, from the viewpoint of making the emulsion particles finer, thereby making the appearance transparent to semi-transparent, improving the elasticity when the skin is pressed after application, reducing stickiness on the skin after application, and improving storage stability.

[0033] In the present invention, the water content of component (E) is preferably 40 to 90% by mass, more preferably 50 to 85% by mass, and even more preferably 60 to 80% by mass, from the viewpoint of making the emulsion particles finer, resulting in a transparent to semi-transparent appearance, improving elasticity when the skin is pressed after application, reducing stickiness on the skin after application, and improving storage stability.

[0034] The emulsified cosmetic composition of the present invention may further contain (F) phospholipids, and by making the emulsified particles finer, the appearance can be made transparent to semi-transparent, and storage stability can be improved. As for such phospholipids, from the viewpoint of making the emulsion particles finer, thereby making the appearance transparent to semi-transparent and improving storage stability, it is preferable that the phosphatidylcholine content be 60% by mass or more, more preferably 64% by mass or more, even more preferably 68% by mass or more, and even more preferably 70% by mass or more. Examples of phospholipid components other than phosphatidylcholine include phosphatidic acid, phosphatidylserine, phosphatidylethanolamine, phosphatidylinositol, and phosphatidylglycerol.

[0035] The phospholipids used in this invention may be natural products extracted and purified from plants or animals, chemically synthesized products, or processed products such as hydrogenation or hydroxylation. As natural products, phospholipids extracted from soybeans or egg yolks or their purified products are preferred from the viewpoint of improving long-term stability and reducing skin irritation, and hydrogenated or hydroxylated phospholipids are more preferred. Specifically, hydrogenated soybean lecithin and / or hydrogenated egg yolk lecithin are suitable examples.

[0036] Phospholipids containing 60% or more phosphatidylcholine include: Coatsome NC-21 (hydrogenated soybean phospholipid; containing 90% or more phosphatidylcholine; manufactured by NOF Corporation), Resinol S-10E (hydrogenated soybean phospholipid; containing 75-85% phosphatidylcholine; manufactured by Nikko Chemicals Co., Ltd.), Resinol S-10EX (hydrogenated soybean phospholipid; containing 95% or more phosphatidylcholine; manufactured by Nikko Chemicals Co., Ltd.), Basis LS-60HR (hydrogenated soybean phospholipid; containing 60-75% phosphatidylcholine; manufactured by Nisshin Oillio Co., Ltd.), Phospholipon 85G (soybean phospholipid; containing 85% phosphatidylcholine; manufactured by H. Holstein Co., Ltd.), Phospholipon 90G (soybean phospholipid; containing 94% or more phosphatidylcholine; manufactured by H. Holstein Co., Ltd.), Phospholipon 75IP (Soybean phospholipid; containing 70% by mass of phosphatidylcholine; manufactured by H. Holstein), Phospholipon 90IP (Soybean phospholipid; containing 90% or more by mass of phosphatidylcholine; manufactured by H. Holstein), Phospholipon 80H (Hydrogenated soybean phospholipid; containing 70% or more by mass of phosphatidylcholine; manufactured by H. Holstein), Phospholipon 90H (Hydrogenated soybean phospholipid; containing 90% or more by mass of phosphatidylcholine; manufactured by H. Holstein), Phospholipon 75HIP (Hydrogenated soybean phospholipid; containing 70% or more by mass of phosphatidylcholine; manufactured by H. Holstein), Phospholipon 90HIP (Hydrogenated soybean phospholipid; containing 90% or more by mass of phosphatidylcholine; manufactured by H. Holstein), Lipoid E Lipoid E 80 (purified egg yolk phospholipid; contains 80% or more phosphatidylcholine by mass; manufactured by H. Holstein), Lipoid E 80 S (purified egg yolk phospholipid; contains 64% or more phosphatidylcholine by mass; manufactured by H. Holstein), Lipoid E PC S (purified egg yolk phospholipid; contains 96% or more phosphatidylcholine by mass; manufactured by H. Holstein), Epikron 200 (contains 95% or more phosphatidylcholine by mass; manufactured by Cargill), Phospholipid PCSH70 (hydrogenated soybean phospholipid; contains 70-80% phosphatidylcholine by mass;Examples include egg yolk lecithin PL-100E (containing approximately 83% by mass of phosphatidylcholine; manufactured by Kewpie Corporation), etc.

[0037] The phospholipid of component (F) can be used individually or in combination of two or more types. From the viewpoint of making the emulsion particles finer, resulting in a transparent to semi-transparent appearance and improved storage stability, the content is preferably 0.0001 to 1% by mass, more preferably 0.001 to 0.5% by mass, and even more preferably 0.01 to 0.3% by mass in the total composition.

[0038] In addition to the above-mentioned components, the emulsified cosmetic composition of the present invention may contain components commonly used in cosmetics, such as surfactants other than those mentioned above, oily components other than those mentioned above, powders, polymer compounds, antioxidants, fragrances, preservatives, pH adjusters, blood circulation promoters, cooling agents, antiperspirants, bactericides, skin activators, moisturizers, cooling agents, and the like.

[0039] The emulsified cosmetic composition of the present invention has an average particle diameter of 10 to 200 nm for the emulsified particles, preferably 30 to 120 nm. When the average particle size of the emulsified particles falls within this range, the emulsified cosmetic will have a transparent to semi-transparent appearance. In this invention, the average particle diameter is the cumulant diameter of the emulsified cosmetic composition, measured using a particle size distribution analyzer (Zetasizer Nano ZS, manufactured by Malvern) by photon correlation spectroscopy (dynamic light scattering method).

[0040] The emulsified cosmetic composition of the present invention can be manufactured by conventional methods, for example, by high-pressure emulsification or by emulsification using an ultrasonic emulsifier. It can also be manufactured by utilizing interfacial chemical properties, such as by raising the temperature of the system above the solubilization limit temperature and then cooling it.

[0041] When manufactured by high-pressure emulsification, the oily components are mixed with surfactants, water, and other components under high shear force, for example, 10 4 s -1 Preferably 10 4 ~108 s -1 , more 10 7 ~10 8 s -1 It can be manufactured by mixing in an emulsifier (e.g., a high-pressure homogenizer) that can achieve a shear rate.

[0042] A high-pressure homogenizer is a device that mixes fluids by ejecting them through very fine gaps under high pressure. The combined energy from collisions between particles, shear forces due to pressure differences, and destructive forces from collisions with impact rings enables emulsification, dispersion, pulverization, grinding, and ultrafine processing. Commercially available high-pressure homogenizers that can be used include homovalve type high-pressure homogenizers such as the High-Pressure Homogenizer (manufactured by Izumi Food Machinery Co., Ltd.) and Minilab 8.3H (manufactured by Rannie Co., Ltd.); chamber type high-pressure homogenizers such as the Microfluidizer (manufactured by Microfluidics Co., Ltd.), Nanomizer (manufactured by Yoshida Machinery Co., Ltd.), Starburst (manufactured by Sugino Machine Co., Ltd.), Genus PY (manufactured by Hakusui Chemical Co., Ltd.), DeBEE2000 (manufactured by Nippon BEE Co., Ltd.), and Ultimizer (manufactured by Tau Technology Co., Ltd.); and Manton-Gaurin type high-pressure homogenizers. Among these, Starburst (manufactured by Sugino Machine Co., Ltd.) is preferred from the standpoint of ease of handling.

[0043] The pressure applied to the high-pressure emulsification section when mixing in a high-pressure homogenizer is preferably 50 MPa or higher, more preferably 70 to 245 MPa, and even more preferably 90 to 210 MPa, from the viewpoint of obtaining a fine emulsion composition. The emulsified cosmetic composition of the present invention can be produced by mixing components (A), (B), (C), (D), and (E) in a high-pressure homogenizer at 50 MPa or higher.

[0044] The emulsified cosmetic composition of the present invention may be either a water-in-oil emulsion or an oil-in-water emulsion, but is preferably an oil-in-water emulsion. Furthermore, the emulsified cosmetic composition of the present invention is suitable as an emulsified cosmetic composition for skin use, and can be applied, for example, as an ultraviolet protection cosmetic such as sunscreen lotion and sunscreen cream; or as a skincare cosmetic such as skincare lotion, skincare emulsion, skincare cream, BB cream, and beauty serum. [Examples]

[0045] Examples 1-7, Comparative Examples 1-2 Oil-in-water emulsion cosmetics (lotions) with the compositions shown in Table 1 were manufactured, and their average particle size, stability, elasticity when the skin was pressed with a finger after application, and non-stickiness were evaluated. The results are also shown in Table 1. Note that the total amount of component (C) in Table 1 is expressed as the amount in terms of acid.

[0046] (Manufacturing method) (1) Mix components 1-4 and a portion of components 5-7 and heat to 80°C. (2) Components 8 and 9 and a portion of component 14 were mixed and heated to 80°C. (3) The remaining components 5-7, the remaining component 14, and components 10-13 were mixed together. (4) Add (2) to (1) and stir, then cool to 35°C, add (3) and mix, and then process under high pressure at 200 MPa in a high-pressure homogenizer (Sugino Machine Co., Ltd., Starburst) to obtain an oil-in-water emulsion cosmetic (lotion).

[0047] (Evaluation method) (1) Average particle size: For each emulsified cosmetic, the cumulant diameter, measured by photon correlation spectroscopy (dynamic light scattering) using a particle size distribution analyzer (Zetasizer Nano ZS, manufactured by Malvern), was defined as the average particle diameter of the emulsified particles.

[0048] (2) Stability: Each emulsified cosmetic was filled into a glass bottle (No. 88, manufactured by Koa Glass Co., Ltd.), stored at 40°C for 4 weeks, then returned to 25°C, and the appearance after 12 hours was visually evaluated against the state immediately after manufacture according to the following criteria. <Evaluation Criteria> 3: No change was observed. 2: No separation is observed, but an increase in turbidity is noted. 1: They are separated.

[0049] (3) Elasticity of the skin when pressed with a finger after application: Three expert evaluators applied each emulsified cosmetic to the cheek area and then pressed the skin with their fingers to evaluate its elasticity according to the following criteria. The results are shown as the total score from the three expert evaluators. <Evaluation Criteria> 4: It feels elastic. 3: It feels slightly elastic. 2: I hardly feel any elasticity. 1: I don't feel any elasticity at all.

[0050] (4) Non-sticky Three expert evaluators applied each emulsified cosmetic to the cheek area and then evaluated the degree of stickiness when touching the skin with their fingers, according to the following criteria. The results are shown as the total score from the three expert evaluators. <Evaluation Criteria> 4: It doesn't feel sticky. 3: It feels almost completely non-sticky. 2: It feels slightly sticky. 1: I definitely feel the stickiness.

[0051] [Table 1]

[0052] *1: Sugar squalane (NIKKOL Sugar Squalane, manufactured by Nippon Surfactant Industry Co., Ltd.) *2: Stearic acid (NAA-1850, manufactured by NOF Corporation) *3: Cholesterol (Cholesterol JSQI, manufactured by Nippon Seika Co., Ltd.) *4: Hydrogenated soybean phospholipid (COATSOME NC-21, manufactured by NOF Corporation) *5: Polyoxyethylene (60E.O.) hydrogenated castor oil (HLB 14.0: NIKKOL HCO-60, manufactured by Nippon Surfactant Industry Co., Ltd.) *6: N-stearoyl-L-glutamate sodium (Amisoft HS-11P, manufactured by Ajinomoto Co., Inc.)

[0053] Prescription Examples 1-6 Oil-in-water emulsion cosmetics with the compositions shown in Tables 2 to 7 were prepared in the same manner as in Examples 1 to 7. All of the resulting cosmetics have an average particle size of emulsion particles in the range of 10 to 200 nm, are transparent to semi-transparent in appearance, have an elastic feel when pressed on the skin after application, are non-sticky, and exhibit excellent storage stability.

[0054] [Table 2]

[0055] [Table 3]

[0056] [Table 4]

[0057] [Table 5]

[0058] [Table 6]

[0059] [Table 7]

Claims

1. The following components (A), (B), (C), (D), and (E): (A) Oils, (B) Nonionic surfactants with HLB 7 to 20, (C) Anionic surfactant, (D) Niacinamide 2-10% by mass, (E) Water An emulsified cosmetic containing [ingredient name], wherein the average particle size of the emulsified particles is 10 to 200 nm.

2. The emulsified cosmetic composition according to claim 1, wherein the content of component (A) is 0.001 to 4% by mass.

3. The emulsified cosmetic composition according to claim 1 or 2, wherein component (C) comprises one or more selected from N-acyl amino acids, fatty acids, N-acylmethyl taurine, and salts thereof.

4. The emulsified cosmetic composition according to claim 1 or 2, wherein the mass ratio (B) / (C) of component (B) to component (C) is 0.01 to 30000.

5. The emulsified cosmetic composition according to claim 1 or 2, wherein the mass ratio (C) / (D) of component (C) to component (D) is 0.00001 to 0.

5.

6. A method for producing an emulsified cosmetic composition according to claim 1 or 2, characterized by mixing components (A), (B), (C), (D), and (E) in a high-pressure homogenizer at 50 MPa or more.

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