Oil-in-water emulsion cosmetic composition

Abstract

The present invention relates to an oil-in-water emulsion cosmetic composition comprising (A) hydrogenated lecithin, (B) phytosterol, (C) acylglutamic acid having 12 to 22 carbon atoms in the acyl group or a salt thereof, (D) an oil agent containing at least (D1) a vegetable oil, and (E) an aqueous medium.

Description

[Technical field]

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

[0002] Oil-in-water emulsions are a type of cosmetic product that provide nourishing and protective benefits through the oil they contain. High viscosity oil-in-water emulsions are used in skin care products such as cosmetic creams and essences.

[0003] An example of a skin care product is a gel-like oil-in-water emulsion composition disclosed in JP 2017-105766 A, which can be emulsified under high pressure conditions of 100 MPa or more. The document states that emulsification is preferably performed under high pressure conditions from the viewpoints of the transparency of the resulting emulsion composition and the stability of the gel over time. [Problem to be solved by the invention]

[0004] In recent years, interest in the safety of cosmetics and environmental protection has been growing, and the demand for cosmetics with a high content of naturally derived ingredients is increasing. An oil-in-water emulsion composition can be produced by replacing the oils such as hydrocarbon oils and silicone oils used in the emulsion described in JP 2017-105766 A with naturally derived oils and emulsifying under the high pressure conditions described in the same document, but even in this case, it was found that the important characteristic of these emulsions, namely the stability, is insufficient.

[0005] Furthermore, for oil-in-water emulsion cosmetics, the texture upon application is also important, but the oil-in-water emulsion cosmetic in which the oil agent in JP2017-105766A is replaced with a naturally derived oil agent not only has low stability, but also has the problem of being unable to provide a light texture upon application.

[0006] Therefore, it is necessary to provide an oil-in-water emulsion cosmetic composition that provides a light texture upon application and has emulsion stability (stability for maintaining the emulsion form) even when a high content of naturally derived ingredients is used. [Means for solving the problem]

[0007] In light of this background, the present invention provides an oil-in-water emulsion cosmetic composition comprising (A) hydrogenated lecithin, (B) phytosterol, (C) acylglutamic acid or a salt thereof having 12 to 22 carbon atoms in the acyl group, (D) at least (D1) an oil agent comprising a vegetable oil, and (E) an aqueous medium. As shown in the examples, the composition provides a light texture upon application and has emulsion stability, even when a high content of naturally derived ingredients is used.

[0008] "(A) Hydrogenated lecithin" will be abbreviated herein as "ingredient (A)", and the other ingredients will be similarly abbreviated.

[0009] In order to obtain an oil-in-water emulsion cosmetic composition that provides a light texture even when it contains a large amount of oil, the present inventors used a high-pressure emulsifier to produce an oil-in-water nanoemulsion (O / W nanoemulsion) containing hydrogenated lecithin and sodium surfactin. However, creaming and coalescence were observed in this oil-in-water emulsion cosmetic composition, and problems arose with the stability of the emulsion. As a result of investigating alternatives to improve the stability of the emulsion, it was found that it was necessary to modify the three-dimensional structure of the surfactant at the interface, and further, it was found that it would be useful to use an amino acid-based surfactant (component (C) above), which is less bulky than sodium surfactin.

[0010] Although the stability of the emulsion was improved by using amino acid-based surfactants, coalescence was observed when vegetable oils were used as oil agents to increase the content of naturally derived ingredients. This was thought to be due to the fact that vegetable oils have a high IOB (inorganic-organic balance) value and have a high affinity with the lipophilic groups of surfactants, which causes the structure to collapse. Further investigation into this issue revealed that a new emulsifying system combining hydrogenated lecithin, phytosterols, and amino acid-based surfactants significantly provided a light texture upon application and significantly improved emulsion stability, even when vegetable oils were used as oil agents. This performance was due to the synergistic effect of the components of the emulsifying system, and such excellent effects could not be obtained if any one of the components of the emulsifying system was missing.

[0011] In a specific embodiment, component (A) and component (B) form a complex in the oil-in-water emulsion cosmetic composition. By using the complex of component (A) and component (B), the solubility and dispersibility in an aqueous solvent are superior to those of component (A) or component (B) alone, and the collapse of the structure due to the high IOB value of the vegetable oil can be suppressed, thereby improving the stability of the emulsion.

[0012] In a particular embodiment, component (C) in the oil-in-water emulsion cosmetic composition comprises stearoyl glutamic acid or a salt thereof.

[0013] In a specific embodiment, it is preferable that component (D) in the oil-in-water emulsion cosmetic composition further comprises (D2) a non-vegetable polar oil, and the mass ratio of component (D2) to component (D1) (R1=D2 / D1) is in the range of 0.01 to 1.

[0014] In a particular embodiment, component (D1) in the oil-in-water emulsion cosmetic composition is selected from the following group: unsaturated hydrocarbon-based vegetable oils, in particular meadowfoam seed oil, soybean oil, castor oil, olive oil, ximenia oil, prakash oil, palm oil, linseed oil, sunflower oil, argan oil, rice bran oil, avocado oil, macadamia oil, peach kernel oil, apricot kernel oil, rapeseed oil, sweet almond oil, canola oil, coriander oil, cottonseed oil, sesame oil, Corn germ oil, wheat germ oil, passion flower oil, grape seed oil, safflower oil, evening primrose oil, walnut oil, blackcurrant seed oil, musk rose oil, camelina oil, raspberry seed oil, cranberry oil, castor oil, meadowfoam oil, annatto oil, androba oil, brazil nut oil, buriti oil, mongongo oil, marula oil, coffee oil, Inca inchi oil, jojoba oil, shea oil, and mixtures thereof.

[0015] In certain embodiments, component (D2) in the oil-in-water emulsion cosmetic composition is selected from the group consisting of: fatty alcohols liquid at room temperature, branched and / or unsaturated carbon chains having 18 to 20 carbon atoms, triglycerides of glycerol and C14-C22 fatty acids, dialkyl carbonates (e.g., dicaprylyl carbonate), and mixtures thereof.

[0016] In a specific embodiment, the oil-in-water emulsion cosmetic composition further comprises a hydrophilic thickener. The combination of the hydrophilic thickener to form a cosmetic cream provides a light texture upon application and excellent emulsion stability. In particular, water-soluble polymers can be used as thickeners.

[0017] In a particular embodiment, the hydrophilic thickener in the oil-in-water emulsion cosmetic composition is selected from the group consisting of acrylates / C10-30 alkyl acrylates, acrylates / C10-30 alkyl acrylate crosspolymers, hydroxyethyl acrylate / sodium acryloyldimethyltaurate copolymers and mixtures thereof, preferably 2-acrylamido-2-methylpropane sulfate (AMPS) copolymers, acrylic acid / C10-C30 alkyl acrylate copolymers and mixtures thereof.

[0018] In a specific embodiment, the total content of components (A) and (B) in the oil-in-water emulsion cosmetic composition is in the range of 0.01 to 10% by mass, preferably 0.05 to 5% by mass, and more preferably 0.1 to 2.5% by mass, based on the total mass. In a specific embodiment, the total content of component (C) is in the range of 0.01 to 5% by mass, preferably 0.05 to 2% by mass, and more preferably 0.05 to 1% by mass, based on the total mass.

[0019] In a specific embodiment, the total content of component (D) in the oil-in-water emulsion cosmetic composition is in the range of 5 to 60 mass %, preferably 5 to 50 mass %, and more preferably 10 to 25 mass %, relative to the total mass.

[0020] In certain embodiments, the oil-in-water emulsion cosmetic composition further comprises at least one polyol, preferably at least two polyols, preferably selected from the following group: glycerin, propylene glycol, butylene glycol, pentylene glycol, and mixtures thereof.

[0021] In certain embodiments, the oil-in-water emulsion cosmetic composition is a nanoemulsion.

[0022] In a specific embodiment, the oil-in-water emulsion cosmetic composition has a mean particle size of 50 to 500 nm, as measured by, for example, dynamic light scattering.

[0023] The present invention also provides a cosmetic process for the care and / or make-up of keratin materials, which process comprises applying the oil-in-water emulsion cosmetic composition described above to keratin materials, in particular to the skin.

[0024] The present invention further provides the above cosmetic process, in which the oil-in-water emulsion cosmetic composition exhibits long-term emulsion stability, provides a light texture and richness to the applied keratin material, and provides a moisturizing effect. [Effects of the invention]

[0025] According to the present invention, it is possible to provide an oil-in-water emulsion cosmetic composition that provides a light texture upon application and has excellent emulsion stability, even if the content of naturally derived ingredients is increased. The oil-in-water emulsion cosmetic composition also provides richness with a moisturizing effect after application. [Detailed Description of the Invention]

[0026] Preferred embodiments of the present invention will be described in detail below, however, the present invention is not limited to the embodiments described below.

[0027] The oil-in-water emulsion cosmetic composition according to the present invention comprises (A) hydrogenated lecithin, (B) phytosterol, (C) acylglutamic acid having 12 to 22 carbon atoms in the acyl group or a salt thereof, (D) an oil agent containing at least (D1) a vegetable oil, and (E) an aqueous medium.

[0028] Component (A) The oil-in-water emulsion cosmetic composition contains hydrogenated lecithin as component (A). Hydrogenated lecithin is obtained by adding hydrogen to lecithin. Lecithin has a hydrophobic group and a hydrophilic group, the hydrophobic group being two acyl groups (fatty acid residues), and the hydrophilic group being an anionic group of a phosphate ester salt and a cationic group of a quaternary ammonium salt. The fatty acid residues of lecithin derived from egg yolk are said to include palmitic acid, stearic acid, oleic acid, linoleic acid, linolenic acid, and arachidic acid, while those derived from soybeans are said to include palmitic acid, stearic acid, oleic acid, linoleic acid, and linolenic acid. Hydrogenated lecithin obtained by hydrogenating such lecithin has a structure in which the hydrophobic group is saturated and the hydrophilic group is maintained. In other words, in the case of egg yolk lecithin, the hydrophobic fatty acid residues are considered to be palmitic acid, stearic acid, arachidic acid, and behenic acid residues, and in the case of soybean lecithin, the palmitic acid and stearic acid residues.

[0029] In the present description, hydrogenated lecithin may be a hydrogenated product of natural lecithin extracted from egg yolk, soybean, corn or rapeseed, or a hydrogenated product of synthetic lecithin. From the viewpoint of obtaining a high content of naturally occurring components, it is preferred that the hydrogenated lecithin is a hydrogenated product of natural lecithin. In a particular embodiment, component (A) consists of a single component as described above. In another embodiment, it is a mixture of two or more of the components described above. In the case of a mixture, it may be a mixture of components of different origin, or a mixture of components of the same origin but with different degrees of hydrogenation, or a mixture of components of different origin and different degrees of hydrogenation. In a preferred embodiment, the degree of hydrogenation of the hydrogenated lecithin is substantially 100% (fully hydrogenated lecithin).

[0030] The total content of component (A) is preferably in the range of 0.01 to 10 mass %, more preferably 0.05 to 5 mass %, and even more preferably 0.1 to 2.5 mass %, relative to the total mass of the oil-in-water emulsion cosmetic composition.

[0031] Ingredient (B) The oil-in-water emulsion cosmetic composition comprises a phytosterol as component (B). In certain embodiments, a single phytosterol is used. In other embodiments, a combination of two or more components (B) is used. In a preferred embodiment, the one or more phytosterols are selected from β-sitosterol, campesterol, stigmasterol, brassicasterol, and mixtures thereof.

[0032] The total content of component (B) is preferably in the range of 0.005 to 5 mass %, more preferably 0.01 to 2.5 mass %, and even more preferably 0.02 to 1 mass %, relative to the total mass of the oil-in-water emulsion cosmetic composition.

[0033] The mass ratio of component (B) to component (A) is preferably in the range of 0.01 to 1, more preferably 0.01 to 0.5, 0.05 to 0.5, 0.1 to 0.3, and still more preferably 0.1 to 0.2.

[0034] According to a preferred embodiment, the oil-in-water emulsion cosmetic composition has a complex formed between component (A) and component (B). The complex means a form in which component (A) and component (B) coexist due to physical or chemical interaction. Such a form includes a form in which the hydrophilic group of component (A) and the hydrophilic group of component (B), and the lipophilic group of component (A) and the lipophilic group of component (B) are regularly arranged in the same direction. A preferred form is a structure similar to a biological membrane. That is, it is a complex having a bilayer structure in which phytosterol is embedded between hydrogenated lecithin in which the hydrophilic group and the lipophilic group are oriented in the same direction, and each layer of the bilayer is arranged so that the lipophilic groups of the hydrogenated lecithin face each other. This form of complex can be obtained, for example, by uniformly dissolving component (A) and component (B) in an organic solvent, and then removing the organic solvent to simultaneously precipitate component (A) and component (B).

[0035] Compared with component (A) alone or component (B) alone, a complex of component (A) and component (B) tends to have better dispersibility in an aqueous solvent and also better emulsion stability.

[0036] The total content of the complex of components (A) and (B) is preferably in the range of 0.01 to 10 mass%, more preferably 0.05 to 5 mass%, and even more preferably 0.1 to 2.5 mass%, relative to the total mass of the oil-in-water emulsion cosmetic composition.

[0037] Ingredients (C) The oil-in-water emulsion cosmetic composition contains, as component (C), an acylglutamic acid or a salt thereof having 12 to 22 carbon atoms in the acyl group. In one embodiment, component (C) consists of the above single component. In another embodiment, component (C) contains a mixture of two or more of the above components. The number of carbon atoms in the acyl group of component (C) is preferably 14 to 20, more preferably 14 to 18, even more preferably 16 to 18, and even more preferably 18.

[0038] Examples of component (C) include lauroyl glutamic acid, myristoyl glutamic acid, palmitoyl glutamic acid, stearoyl glutamic acid and salts thereof, and mixtures thereof. In a preferred embodiment, component (C) is stearoyl glutamic acid or a salt thereof.

[0039] Salts of stearoyl glutamic acid include sodium, potassium, calcium, aluminum and magnesium salts. In a particular embodiment, component (C) comprises a sodium salt of acyl glutamic acid, preferably sodium stearoyl glutamate.

[0040] The total content of stearoyl glutamic acid and salts thereof based on the component (C) is in the range of 50 to 100% by mass, preferably 80 to 100% by mass, and more preferably 90 to 100% by mass.

[0041] The total content of component (C) is preferably in the range of 0.01 to 5% by mass, preferably 0.05 to 2% by mass, and more preferably 0.05 to 1% by mass, based on the total mass of the oil-in-water emulsion cosmetic composition. The total content of stearoyl glutamic acid and its salts is preferably in the range of 0.01 to 5% by mass, preferably 0.05 to 2% by mass, and more preferably 0.05 to 1% by mass, based on the total mass of the oil-in-water emulsion cosmetic composition.

[0042] Ingredients (D) The oil-in-water emulsion cosmetic composition contains a vegetable oil (component (D1)) as component (D).

[0043] Vegetable oils are oils obtained from raw materials of plant origin. In a particular embodiment, component (D1) is selected from the following group: unsaturated hydrocarbon-based vegetable oils, in particular unsaturated fatty acid triglycerides (meadowfoam seed oil, soybean oil, castor oil, olive oil, ximenia oil, prakash oil, palm oil, linseed oil, sunflower oil, argan oil, rice bran oil, avocado oil, macadamia oil, peach kernel oil, apricot kernel oil, rapeseed oil, sweet almond oil, canola oil, coriander oil, cottonseed oil, sesame oil, tofu oil, thyme ... sorghum germ oil, wheat germ oil, passion flower oil, grape seed oil, safflower oil, evening primrose oil, walnut oil, blackcurrant seed oil, musk rose oil, camelina oil, raspberry seed oil, cranberry oil, castor oil, meadowfoam oil, annatto oil, androba oil, brazil nut oil, buriti oil, mongongo oil, marula oil, coffee oil, Inca inchi oil, jojoba oil, shea butter oil, and mixtures thereof). In certain embodiments, component (D) comprises at least meadowfoam seed oil.

[0044] The total content of component (D1) is preferably in the range of 1 to 60 mass %, more preferably 5 to 50 mass %, and even more preferably 10 to 25 mass %, relative to the total mass of the oil-in-water emulsion cosmetic composition.

[0045] In a specific embodiment, the oil-in-water emulsion cosmetic composition does not include a non-vegetable oil as component (D). In a certain embodiment, the oil-in-water emulsion cosmetic composition includes a non-vegetable oil as component (D). The non-vegetable oil is an oil other than a vegetable oil, and includes an animal oil and a mineral oil. The non-vegetable oil can be either a polar non-vegetable oil (component (D2)) or a non-polar non-vegetable oil, although a polar non-vegetable oil is preferred from the viewpoint of obtaining a light texture.

[0046] Preferably, the non-vegetable oil is selected from the group: monoesters of aliphatic carboxylic acids, monoesters of aliphatic alcohols, dialkyl carbonates and saturated or unsaturated aliphatic alcohols, hydrocarbon oils or silicone oils. Specific non-vegetable oils include ethyl-2-hexyl benzoate, octyl-2-dodecyl benzoate, isostearyl benzoate, pentaerythrityl tetraisostearate, trimethylolpropane triisostearate, tridecyl citric acid, tridecyl trimellitate, dicapryl carbonate, di(ethyl-2-hexyl)-carbonate, isostearyl lactate, octyl hydroxystearate, octyldodecyl hydroxystearate, cetyl lactate, myristyl lactate, alkane, polyolefin, hydrogenated polyolefin, squalane, phenyl trimethicone, phenyl dimethicone, phenyl trimethylsiloxy diphenyl siloxane, diphenyl dimethicone, diphenyl methyl diphenyl trisiloxane, 2-phenylethyl trimethylsiloxy silicate, and mixtures thereof. In certain embodiments, the non-vegetable oil is not a silicone oil.

[0047] In a particular embodiment, component (D2) is selected from the group consisting of fatty alcohols liquid at room temperature with a branched and / or unsaturated carbon chain having 18 to 20 carbon atoms, triglycerides of glycerol and C14-C22 fatty acids, dialkyl carbonates (such as dicapryl carbonate) and mixtures thereof.

[0048] In certain embodiments, the oil-in-water emulsion cosmetic composition further comprises a fragrance oil as component (D). The fragrance oil may be one that qualifies as component (D1) or one that qualifies as component (D2).

[0049] The total content of component (D2) is preferably in the range of 0.01 to 20% by mass, and more preferably 0.05 to 15% by mass, based on the total mass of the oil-in-water emulsion cosmetic composition.

[0050] The total content of component (D) is preferably in the range of 1 to 60 mass %, more preferably 5 to 50 mass %, and even more preferably 10 to 25 mass %, relative to the total mass of the oil-in-water emulsion cosmetic composition.

[0051] When the oil-in-water emulsion cosmetic composition contains components (D1) and (D2) as component (D), the mass ratio (R1) of component (D2) to component (D1) (R1=D2 / D1) is in the range of 0.01 to 1, preferably 0.05 to 1, and more preferably 0.1 to 1.

[0052] Ingredient (E) The oil-in-water emulsion cosmetic composition comprises an aqueous medium as component (E). In certain embodiments, the aqueous medium is composed entirely of water. In other embodiments, the aqueous medium is composed of water and a water-soluble solvent (e.g., a water-soluble low-molecular-weight monoalcohol).

[0053] The total content of component (E) is preferably in the range of 40 to 90 mass %, 50 to 80 mass %, and more preferably 55 to 70 mass %, relative to the total mass of the oil-in-water emulsion cosmetic composition.

[0054] In some embodiments, the oil-in-water emulsion cosmetic composition further comprises a polyol. Examples of polyols include glycols such as 1,3-propanediol, propylene glycol, butylene glycol, pentylene glycol, dipropylene glycol and polyethylene glycol, glycerols such as glycerin, diglycerin and polyglycerin, sugar alcohols such as sorbitol, and mixtures thereof. In certain embodiments, the oil-in-water emulsion cosmetic composition comprises at least one polyol, preferably at least two polyols, which are preferably selected from glycerin, propylene glycol, butylene glycol, pentylene glycol and mixtures thereof.

[0055] In a specific embodiment, the polyol is a low molecular weight polyol having a molecular weight of not more than 1000. The molecular weight of the polyol is preferably in the range of 50-1000, more preferably 70-500, and even more preferably 80-300.

[0056] The total content of polyol is preferably in the range of 1 to 40% by mass, more preferably 5 to 30% by mass, and even more preferably 10 to 25% by mass, relative to the total mass of the oil-in-water emulsion cosmetic composition.

[0057] In a specific embodiment, the oil-in-water emulsion cosmetic composition further comprises a hydrophilic thickener. The hydrophilic thickener may be a water-soluble polymer, a (meth)acrylic polymer, or a polysaccharide. The oil-in-water emulsion cosmetic composition comprising such a hydrophilic thickener exhibits excellent stability while maintaining an appropriate viscosity.

[0058] Preferably, the (meth)acrylic polymer is selected from the group consisting of acrylates / C10-30 alkyl acrylate, acrylates / C10-30 alkyl acrylate crosspolymer, hydroxyethyl acrylate / sodium acryloyldimethyltaurate copolymer, and mixtures thereof.

[0059] Preferably, the polysaccharide is selected from the group consisting of xanthan gum, welan gum, gellan gum, diutan gum and mixtures thereof.

[0060] The total content of the hydrophilic thickener is preferably in the range of 0.01 to 10% by mass, more preferably 0.05 to 5% by mass, and even more preferably 0.1 to 1% by mass, relative to the total mass of the oil-in-water emulsion cosmetic composition.

[0061] In certain embodiments, the oil-in-water emulsion cosmetic composition also contains additives commonly used in cosmetics, preferably selected from the group consisting of stabilizers, moisturizers, pH adjusters, fragrances, preservatives, active ingredients, antioxidants, anti-UV agents, skin whitening agents, pigments, colorants, skin conditioning agents, and mixtures thereof.

[0062] The oil-in-water emulsion cosmetic composition contains emulsion particles, and at least one of the components (A) to (D) forms emulsion particles. The oil-in-water emulsion cosmetic composition is preferably a nanoemulsion. The average particle size of the nanoemulsion is in the range of 50 to 500 nm, preferably 50 to 300 nm, and more preferably 50 to 100 nm, when measured by dynamic light scattering. The average particle size of the emulsion particles can be measured using a particle size measuring device based on dynamic light scattering (e.g., DelsaMax CORE, manufactured by Beckman Coulter).

[0063] In one embodiment, the oil-in-water emulsion cosmetic composition according to the present invention is produced by mixing and stirring components (A) to (E) together with a hydrophilic thickener and a stabilizer while heating at 60 to 85°C, and then cooling the mixture to room temperature for emulsification.

[0064] In particular, the oil-in-water emulsion cosmetic composition according to the present invention can be used in the form of a cream, liquid, or lotion. The oil-in-water emulsion cosmetic composition according to the present invention preferably contains a large amount of naturally derived ingredients. In particular, the content of naturally derived ingredients is 90% or more, preferably 91% or more, more preferably 92% or more, more preferably 93% or more, more preferably 94% or more, and even more preferably 95% or more, when measured according to ISO16128.

[0065] Another aspect of the present invention relates to a cosmetic process for the care and / or make-up of keratinous materials, in particular skin, comprising applying the above-mentioned oil-in-water emulsion cosmetic composition to the keratinous materials, in which the oil-in-water emulsion cosmetic composition exhibits long-term emulsion stability and provides a light texture and rich moisturizing effect to the applied keratinous materials. The present invention is further illustrated by the following non-limiting examples and comparative examples. EXAMPLES

[0066] Example 1 and Comparative Examples 1 to 5 Phases 1 to 3 shown in Table 1 were heated to 75°C, and Phase 1 was dissolved by stirring with a stirrer at 1000 rpm. Phase 2 was added to Phase 1 and stirred for 10 minutes with a stirrer at 1000 rpm to obtain a mixture of Phases 1 and 2. Phase 3 was added to the mixture of Phases 1 and 2 and stirred for 10 minutes with a stirrer at 1000 rpm to obtain a mixture of Phases 1 to 3. The mixture of Phases 1 to 3 was cooled to room temperature and dispersed three times at 200 MPa using Starburst Mini (Sugino Machine Co., Ltd.). Thus, an oil-in-water nanoemulsion was obtained.

[0067] Example 1 and Comparative Examples 1 to 5 Phases 1 to 3 shown in Table 1 were heated to 75°C, and Phase 1 was dissolved by stirring with a stirrer at 1000 rpm. Phase 2 was added to Phase 1 and stirred for 10 minutes with a stirrer at 100 rpm to obtain a mixture of Phases 1 and 2. Phase 3 was added to the mixture of Phases 1 and 2 and stirred for 10 minutes with a stirrer at 1000 rpm to obtain a mixture of Phases 1 to 3. The mixture of Phases 1 to 3 was cooled to room temperature and dispersed three times at 200 MPa using Starburst Mini (Sugino Machine Co., Ltd.). Thus, an oil-in-water nanoemulsion was obtained.

[0068] [Table 1]

[0069] Below are the details of the materials listed in the table: Hydrogenated lecithin and phytosterol complex: Phytocompo PP, Nippon Fine Chemicals Hydrogenated Lecithin: EMULMETIK 100, Lucas Meyer Cosmetics by IFF Inc. Sodium stearoyl glutamate: AMISOFT HS-11, Ajinomoto Healthy Supply Co., Ltd. Sodium surfactin: KANEKA SURFACTIN, Kaneka Corporation Meadowfoam seed oil: FANCOR MEADOWFOAM SEED OIL, Elementis Co. · Dicaprylyl carbonate: CETIOL CC, BASF Co. Hydrogenated Polydecene: SILKFLO 364, Vantage Personal Care Co. Preservatives: Chlorphenesin and Hydroxyacetophenone Acrylates / C10-30 Alkyl Acrylate Crosspolymer: CARBOPOL ULTREZ 21, Lubrizol Co. · Hydroxyethyl acrylate / sodium acryloyldimethyl taurate copolymer: SIMULGEL NS, Seppic Co.

[0070] [evaluation] Emulsion particle size measurement The average particle size of the emulsion particles was measured by dynamic light scattering using a particle size measuring device (DelsaMax CORE, manufactured by Beckman Coulter, Inc.) The results are shown in Table 2.

[0071] Texture evaluation Each sample was applied to the skin by a panel of cosmetic experts and rated according to the following rating scale, the results of which are shown in Table 2. A: Very light texture B: Almost no light texture C: No light texture at all

[0072] Emulsion Stability Each sample was filled into a transparent glass container and sealed. The glass container was placed in a thermostatic chamber at 50°C and left for one month. The stability of the emulsion was visually evaluated based on the following rating scale. The results are shown in Table 2. A: No change B: Mild creaming and / or coalescence C: Creaming and / or coalescence Compositions that receive an "A" rating in each criterion (texture and stability) are acceptable for the present invention.

[0073] [Table 2]

[0074] The oil-in-water emulsion cosmetic compositions according to the present invention obtained in Examples 1 and 2 contained large amounts of naturally derived ingredients, namely hydrogenated lecithin, phytosterol, sodium stearoyl glutamate, and vegetable oil, provided a light texture upon application, and exhibited excellent stability with no phase separation even after one month at 50°C.

[0075] However, in Comparative Examples 1 to 4, when component A was not included (Comparative Example 1), components A and B were not included (Comparative Example 2), or component C was not included (Comparative Examples 3 and 4), phase separation was observed after 1 month at 50° C. Furthermore, in Comparative Example 5, in which the vegetable oil (component D) was replaced with a non-vegetable oil, the emulsion showed excellent stability, but the texture upon application was unacceptable.

Claims

1. 1. An oil-in-water emulsion cosmetic composition comprising: (A) hydrogenated lecithin, (B) phytosterols, (C) an acylglutamic acid having 12 to 22 carbon atoms in the acyl group or a salt thereof; (D) at least (D1) an oil agent containing a vegetable oil, and (E) Aqueous medium.

2. 2. The oil-in-water emulsion cosmetic composition according to claim 1, wherein the component (A) and the component (B) form a complex.

3. The oil-in-water emulsion cosmetic composition according to claim 1 or 2, wherein the component (C) comprises stearoyl glutamic acid or a salt thereof.

4. The oil-in-water emulsion cosmetic composition according to any one of claims 1 to 3, wherein the component (D) further comprises (D2) a non-vegetable oil, and a mass ratio R1 of the component (D2) to the component (D1) (R1 = D2 / D1) is 0.01 to 1.

5. The component (D1) is an unsaturated hydrocarbon vegetable oil, in particular meadowfoam seed oil, soybean oil, castor oil, olive oil, xymenia oil, prakash oil, palm oil, linseed oil, sunflower oil, argan oil, rice bran oil, avocado oil, macadamia oil, peach kernel oil, apricot kernel oil, rapeseed oil, sweet almond oil, canola oil, coriander oil, cottonseed oil, sesame oil, corn germ oil, wheat germ oil, passion flower oil, grape seed oil, behenyl alcohol, maltitol ...

5. The oil-in-water emulsion cosmetic composition according to any one of claims 1 to 4, wherein the oil is selected from the group consisting of nibana oil, evening primrose oil, walnut oil, blackcurrant seed oil, musk rose oil, camelina oil, raspberry seed oil, cranberry oil, castor oil, meadowfoam oil, annatto oil, androba oil, brazil nut oil, buriti oil, mongongo oil, marula oil, coffee oil, Inca inchi oil, jojoba oil, shea butter oil, and mixtures thereof.

6. The oil-in-water emulsion cosmetic composition according to claim 4, wherein said component (D2) is selected from the group consisting of fatty alcohols which are liquid at room temperature and have a branched and / or unsaturated carbon chain having 18 to 20 carbon atoms, glycerol and triglycerides of C14-C22 fatty acids, dialkyl carbonates (e.g. dicaprylyl carbonate) and mixtures thereof.

7. The oil-in-water emulsion cosmetic composition according to any one of claims 1 to 6, further comprising a hydrophilic thickener.

8. 8. The oil-in-water emulsion cosmetic composition according to claim 7, wherein said hydrophilic thickener is selected from the group consisting of acrylates / C10-30 alkyl acrylate, acrylates / C10-30 alkyl acrylate crosspolymer, hydroxyethyl acrylate / sodium acryloyldimethyltaurate copolymer and mixtures thereof, preferably 2-acrylamido-2-methylpropanesulfonic acid (AMPS) copolymer, acrylic acid / C10-C30 alkyl acrylate copolymer and mixtures thereof.

9. The oil-in-water emulsion cosmetic composition according to any one of claims 1 to 8, wherein the total content of the component (A) and the component (B) is in the range of 0.01 to 10% by mass, preferably 0.05 to 5% by mass, and more preferably 0.1 to 2.5% by mass, based on the total mass of the oil-in-water emulsion cosmetic composition.

10. The oil-in-water emulsion cosmetic composition according to any one of claims 1 to 9, wherein the total content of component (C) is in the range of 0.01 to 5 mass %, preferably 0.05 to 2 mass %, and more preferably 0.05 to 1 mass %, based on the total mass of the oil-in-water emulsion cosmetic composition.

11. The oil-in-water emulsion cosmetic composition according to any one of claims 1 to 10, wherein the total content of component (D) is in the range of 5 to 60% by mass, preferably 5 to 50% by mass, based on the total mass of the oil-in-water emulsion cosmetic composition.

12. The oil-in-water emulsion cosmetic composition according to any one of claims 1 to 11, further comprising at least one polyol, preferably at least two polyols, preferably polyols selected from the group consisting of glycerin, propylene glycol, butylene glycol, pentylene glycol and mixtures thereof.

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