Oil-in-water type emulsion cosmetic

Abstract

To provide an oil-in-water type emulsion cosmetic that has excellent emulsion stability, less stickiness after application, and excellent rich feeling in application.SOLUTION: An oil-in-water type emulsion cosmetic contains a) hydrogenated lecithin, b) anionic surfactant derived from a microorganism, c) at least one kind of polyol containing glycerol, and d) polysaccharide in a cosmetically acceptable medium, where the content of anionic surfactant is preferably within the range of 0.005 mass% or more and 1 mass% or less based on the whole amount of the oil-in-water type emulsion cosmetic.SELECTED DRAWING: None

Description

[Technical field]

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

[0002] As a cosmetic formulation, oil-in-water emulsion cosmetics, in which an oily component is dispersed in an aqueous phase containing an aqueous component, are known. Oil-in-water emulsion cosmetics are used in skin care products and the like because they can provide the skin with a fresh feel due to the aqueous component and high moisturizing properties due to the oil component.

[0003] In recent years, consumers have become more "natural" oriented, and cosmetics containing raw materials derived from natural products are increasingly requested. For example, Korean Patent Publication No. 2003-0064986 discloses an oil-in-water emulsion cosmetic containing lecithin or a lecithin derivative extracted from a plant and surfactin produced by Bacillus subtilis as naturally derived surfactants. Japanese Patent Publication No. 2008-069075 also discloses a skin care composition containing sodium surfactin. [Problem to be solved by the invention]

[0004] Cosmetics using raw materials derived from natural products often have difficulty in ensuring the stability of quality. For example, when surfactants derived from natural products are used, the emulsion stability tends to be inferior to that of synthetic surfactants. Therefore, a method of improving the emulsion stability of cosmetics using surfactants derived from natural products has been studied. In the cosmetics of Korean Patent Publication No. 2003-0064986, the emulsion stability is improved by reducing the average particle size of the emulsion particles to a range of 10 to 100 nm. Such emulsions are called "nanoemulsions". However, cosmetics with small average particle size often fail to provide the texture required for cosmetics, especially when consumers desire a rich feeling when applied (a moderate viscosity or thickness when applied).

[0005] There is also a need for cosmetic products to have a desired texture. For example, consumers want cosmetics to feel less sticky after application.

[0006] Therefore, an object of the present invention is to provide an oil-in-water emulsion cosmetic that has excellent emulsion stability and is less sticky after application. Another object of the present invention is to provide an oil-in-water emulsion cosmetic that has excellent emulsion stability, is less sticky after application, and has a rich feel when applied. [Means for solving the problem]

[0007] The present inventors have found that by selecting a specific surfactant derived from a natural product and combining it with a specific component, an oil-in-water emulsion cosmetic with high emulsion stability can be obtained. They have also found that this oil-in-water emulsion cosmetic is less sticky when applied to the skin, and have completed the present invention. The present inventors have also demonstrated that the oil-in-water emulsion of the present invention is preferable for imparting a rich feeling when applied, compared to nanoemulsions. [Summary of the invention]

[0008] According to one aspect of the present invention, there is provided an oil-in-water emulsion cosmetic comprising hydrogenated lecithin, a microbial anionic surfactant, a polyol containing glycerin, and a polysaccharide in a cosmetically acceptable medium. In a specific embodiment, the content of the anionic surfactant is in the range of 0.005% by mass to 1% by mass based on the total mass of the oil-in-water emulsion cosmetic.

[0009] Hereinafter, "mass %" may also be referred to as "weight %." Hereinafter, the "oil-in-water emulsion cosmetic" will also be referred to as an "oil-in-water emulsion," "oil-in-water emulsion composition," or "oil-in-hand emulsion cosmetic composition." "Cosmetically or physiologically acceptable" means compatibility with keratinous materials, especially with the skin, having a color, a fragrance, a pleasant feel and not causing unacceptable discomfort (stinging, tightness).

[0010] This cosmetic has excellent emulsion stability, as the emulsion is less likely to cream even after long-term storage, and is also less likely to coalesce or separate. This oil-in-water emulsion cosmetic has high permeability to the skin, provides a pleasant feel such as freshness, smoothness, and long-lasting moisture, and is less sticky after application. In addition, this oil-in-water emulsion cosmetic uses surfactants derived from natural products, making it an environmentally friendly formula.

[0011] In a specific embodiment, the average particle size of the emulsion particles is 500 nm or more. In this embodiment, the oil-in-water emulsion cosmetic of the present invention is not a "nanoemulsion". The oil-in-water emulsion cosmetic of this embodiment has the advantage of providing an excellent rich feeling when applied. That is, another object of one aspect of the present invention is to provide an oil-in-water emulsion cosmetic that has excellent emulsion stability, is less sticky after application, and provides an excellent rich feeling when applied. The rich feeling when applied means a feeling of application having appropriate viscosity or thickness.

[0012] The anionic surfactant is preferably sodium surfactin. The content of the polyol is preferably 5% by mass or more based on the total amount of the oil-in-water emulsion cosmetic. This can further increase the stability of the emulsion.

[0013] The oil-in-water emulsion cosmetic may contain an electrolyte. The electrolyte may contain a cosmetically active substance.

[0014] The present invention also relates to a cosmetic method for the care and / or make-up of keratinous materials, which comprises applying an oil-in-water emulsion cosmetic composition as defined in the present invention to keratinous materials, in particular to the skin. [Effects of the invention]

[0015] According to the present invention, it is possible to provide an oil-in-water emulsion cosmetic that has superior emulsion stability and is less sticky after application compared to conventional cosmetics. Furthermore, even if the oil-in-water emulsion cosmetic is not a conventional emulsion, i.e., a nanoemulsion, it has an excellent richness when applied. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] An embodiment of the present invention will be described below, however, the present invention is not limited to the following embodiment.

[0017] The cosmetic according to one embodiment is an oil-in-water emulsion cosmetic (a cosmetic made of an oil-in-water emulsion). In this cosmetic, an oily component is dispersed as particles in an aqueous phase containing an aqueous component. In an oil-in-water emulsion, the particles of the oily component are also called emulsion particles.

[0018] The oil-in-water emulsion cosmetic of the present embodiment contains hydrogenated lecithin, an anionic surfactant derived from a microorganism, a polyol containing glycerin, and a polysaccharide. Hydrogenated Lecithin

[0019] Hydrogenated lecithin is lecithin that has been subjected to hydrogenation treatment, and at least a part of the unsaturated double bonds has been converted to saturated bonds. Hydrogenated lecithin includes hydrogenated lecithin of vegetable lecithin such as hydrogenated soybean lecithin, hydrogenated corn lecithin, hydrogenated palm lecithin, and hydrogenated coconut lecithin. The hydrogenated lecithin is preferably hydrogenated soybean lecithin. One type of hydrogenated lecithin may be used alone, or two or more types may be used in combination. When an oil-in-water emulsion cosmetic contains hydrogenated lecithin, a stable lamellar structure is formed on the surface of the emulsion particles, and the emulsion stability of the oil-in-water emulsion cosmetic can be improved. In addition, the inclusion of hydrogenated lecithin provides a rich feeling when applied while Reduces stickiness after application.

[0020] From the viewpoint of further enhancing emulsion stability, the content of hydrogenated lecithin is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, even more preferably 0.3% by mass or more, and preferably 2% by mass or less, more preferably 1.5% by mass or less, and even more preferably 1.0% by mass or less, based on the total amount of the oil-in-water emulsion cosmetic, in particular, the content of hydrogenated lecithin is 0.1 to 2% by mass, preferably 0.2 to 1.5% by mass, and more preferably 0.3 to 1% by mass, based on the total amount of the emulsion cosmetic of the present invention. Anionic surfactants derived from microorganisms

[0021] Examples of anionic surfactants derived from microorganisms include lipopeptides such as surfactin, arthrofactin, and sodium surfactin, or salts thereof, and fatty acids such as spiculisporic acid. From the viewpoint of promoting the formation of emulsion particles and further enhancing emulsion stability, the anionic surfactant derived from microorganisms preferably contains a lipopeptide or a salt thereof, and more preferably contains surfactin or a salt thereof. These anionic surfactants derived from microorganisms may be used alone or in combination of two or more kinds.

[0022] Surfactin is a cyclic lipopeptide represented by the following formula (1). [ka] In the formula, X is leucine, isoleucine, valine, glycine, serine, alanine, threonine, asparagine, glutamine, aspartic acid, glutamic acid, lysine, arginine, cysteine, methionine, phenylalanine, tyrosine, tryptophan, histidine, proline, 4-hydroxyproline, homoserine, etc., and R represents a linear or branched alkyl group having 8 to 14 carbon atoms. X is preferably leucine.

[0023] The salt of surfactin includes sodium salt, potassium salt, monoethanolamine salt, diethanolamine salt, triethanolamine salt, lysine salt and arginine salt. The salt of surfactin is preferably sodium salt (sodium surfactin).

[0024] When sodium surfactin is used as the anionic surfactant derived from a microorganism, a commercially available product can be used. An example of a commercially available product of sodium surfactin that can be used is Kaneka Surfactin (manufactured by Kaneka Corporation).

[0025] In a specific embodiment, the content of the anionic surfactant derived from a microorganism is 1% by mass or less based on the total amount of the oil-in-water emulsion cosmetic. This can increase the emulsion stability of the oil-in-water emulsion cosmetic and suppress stickiness. From the same viewpoint, the content of the anionic surfactant derived from a microorganism is preferably 0.8% by mass or less, 0.6% by mass or less, 0.5% by mass or less, 0.3% by mass or less, 0.1% by mass or less, 0.08% by mass or less, or 0.06% by mass or less based on the total amount of the oil-in-water emulsion cosmetic. From the viewpoint of increasing the emulsion stability, the content of the anionic surfactant derived from a microorganism is preferably 0.005% by mass or more based on the total amount of the oil-in-water emulsion cosmetic, more preferably 0.01% by mass or more, and even more preferably 0.02% by mass or more.

[0026] From this viewpoint, the content of the microbial anionic surfactant is, based on the total amount of the oil-in-water emulsion cosmetic, 0.005 to 1 mass%, 0.01 to 1 mass%, 0.02 to 1 mass%, 0.005 to 0.8 mass%, 0.01 to 0.8 mass%, 0.02 to 0.8 mass%, 0.005 to 0.6 mass%, 0.01 to 0.6 mass%, 0.02 to 0.6 mass%, 0.005 to 0.5 mass%, 0.01 to 0.5 mass%, 0.005 ... .02~0.5% by mass, 0.005~0.3% by mass, 0.01~0.3% by mass, 0.02~0.3% by mass, 0.005~0.1% by mass, 0.01~0.1% by mass, 0.02~0.1% by mass, 0. 005-0.08% by mass, 0.01-0.08% by mass, 0.02-0.08% by mass, 0.005-0.06% by mass, 0.01-0.06% by mass, or 0.02-0.06% by mass. In particular, the content of the microbial anionic surfactant is 0.005 to 1 mass%, particularly 0.01 to 0.8 mass%, preferably 0.02 to 0.6 mass%, and even more preferably 0.02 to 0.1 mass%, based on the total amount of the oil-in-water emulsion cosmetic of the present invention. polysaccharide

[0027] The oil-in-water emulsion cosmetic contains polysaccharides. This can increase the emulsion stability and the level of richness when applied. Examples of polysaccharides include xanthan gum, guar gum, locust bean gum, Alcaligenes-produced polysaccharides, Tremella fuciformis polysaccharides, carrageenan, agar, and sodium hyaluronate. Polysaccharides derived from natural products are preferred, and polysaccharides derived from microorganisms such as xanthan gum, Alcaligenes-produced polysaccharides, and sodium hyaluronate are more preferred. These polysaccharides can be used alone or in combination of two or more. The oil-in-water emulsion cosmetic may contain two or more polysaccharides. In a particular embodiment, the oil-in-water emulsion cosmetic contains a polysaccharide selected from xanthan gum, alcaligenes polysaccharides, sodium hyaluronate, and mixtures thereof.

[0028] From the viewpoint of further enhancing the richness upon application, the content of the polysaccharides, based on the total amount of the oil-in-water emulsion cosmetic, is preferably 0.005% by mass or more, more preferably 0.01% by mass or more, and even more preferably 0.05% by mass or more, and may be 3% by mass or less, 2% by mass or less, or 1% by mass or less, 0.5% by mass or less, 0.3% by mass or less, or 0.2% by mass or less. In a specific embodiment, the content of the polysaccharide is 0.005 to 3 mass %, particularly 0.05 to 2 mass %, and preferably 0.1 to 1 mass %, based on the total amount of the oil-in-water emulsion cosmetic. Polyol

[0029] The oil-in-water emulsion cosmetic contains at least one polyol (polyhydric alcohol) containing at least glycerin. The polyol is a compound having two or more hydroxyl groups (-OH), and is preferably an aliphatic compound. The polyol containing glycerin may be glycerin alone or may be a combination of glycerin and another polyol. When the oil-in-water emulsion cosmetic contains a polyol consisting of glycerin, it is possible to enhance the richness of the cosmetic when applied. In addition, hydrogenated lecithin and anionic surfactant derived from microorganisms are well dissolved, and the emulsion stability can be enhanced. When the polyol contains glycerin, the emulsion stability is further enhanced.

[0030] The number of hydroxyl groups of the polyol other than glycerin may be 2 or more, or 3 or more, and may be 10 or less, 8 or less, 6 or less, or 4 or less. The number of carbon atoms of the polyol may be, for example, 1 or more, 2 or more, or 3 or more, and 10 or less, 8 or less, or 6 or less.

[0031] Examples of polyols other than glycerin include glycols such as butylene glycol (1,3-butylene glycol, etc.), pentylene glycol (1,2-pentanediol, etc.), propanediol (1,3-propanediol, propylene glycol, etc.), dipropylene glycol, and hexanediol (1,2-hexanediol, etc.); glycerols such as diglycerin and polyglycerin; and sugar alcohols such as sorbitol, glycerol, xylitol, mannitol, and erythritol. The polyols other than glycerin may be used alone or in combination of two or more. In certain embodiments, the oil-in-water emulsion cosmetic of the present invention comprises at least glycerin and another polyol selected from butylene glycol, propanediol, and mixtures thereof.

[0032] The total content of the polyol containing glycerin is preferably 5% by mass or more based on the total amount of the oil-in-water emulsion cosmetic. This can further improve emulsion stability. The total content of the polyol containing glycerin is more preferably 6% by mass or more, even more preferably 8% by mass or more based on the total amount of the oil-in-water emulsion cosmetic, and may be 30% by mass or less, 25% by mass or less, 20% by mass or less, 15% by mass or less, or 12% by mass or less. In a specific embodiment, the total content of the polyol containing glycerin, preferably glycerin, butylene glycol, and propanediol, based on the total amount of the oil-in-water emulsion cosmetic, is 5 to 30% by mass, particularly 6 to 25% by mass, and preferably 8 to 15% by mass. From a similar viewpoint, the content of the polyol including glycerin may be 5 to 30 mass%, particularly 6 to 30 mass%, 6 to 25 mass%, 6 to 20 mass%, 6 to 15 mass%, 6 to 12 mass%, 8 to 30 mass%, 8 to 25 mass%, 8 to 20 mass%, 8 to 15 mass%, or 8 to 12 mass%.

[0033] From the viewpoint of further enhancing emulsion stability, the content of glycerin in the total amount of polyol is preferably 20% by mass or more, more preferably 30% by mass or more, and even more preferably 40% by mass or more, based on the total amount of polyol. The content of glycerin may be 100% by mass, 80% by mass or less, or 60% by mass or less, based on the total amount of polyol. Oil Phase

[0034] In the oil-in-water emulsion cosmetic of the present embodiment, the oil component is present as emulsion particles. In one embodiment, the oil component includes an oil agent.

[0035] Examples of the oil include oils that are generally used in cosmetics, such as vegetable oils and fats, waxes, hydrocarbon oils, higher fatty acids, higher alcohols, ester oils, silicone oils, etc. The oil may be in a liquid, paste, or solid form.

[0036] Examples of vegetable oils include meadowfoam oil, olive fruit oil, camellia oil, coconut oil, macadamia nut oil, rosehip oil, avocado oil, sunflower seed oil, rice bran oil, castor oil, almond oil, mango seed oil, peony seed oil, murumuru seed oil, and shea butter.

[0037] Examples of waxes include vegetable waxes such as jojoba seed oil, carnauba wax, and candelilla wax.

[0038] Examples of hydrocarbon oils include liquid paraffin, paraffin, petrolatum, ceresin, dodecane, isododecane, tetradecane, isotetradecane, hexadecane, isohexadecane, squalane, polybutene, polyisobutene, hydrogenated polyisobutene, and olefin oligomers.

[0039] Examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, and isostearic acid.

[0040] Examples of higher alcohols include cetyl alcohol, isostearyl alcohol, 2-octyldodecanol, and behenyl alcohol.

[0041] Examples of ester oils include isopropyl myristate, 2-octyldodecyl myristate, cetyl 2-ethylhexanoate, isononyl isononanoate, dicaprylyl carbonate, polyglyceryl diisostearate, diglyceryl triisostearate, glyceryl tribehenate, and diisostearyl malate.

[0042] Examples of silicone oils include polydimethylsiloxane (dimethicone), polymethylphenylsiloxane (diphenyldimethicone), phenyltrimethicone, and diphenylsiloxyphenyltrimethicone.

[0043] Among the above-mentioned oils, oils derived from natural products are preferably used. The oils derived from natural products may be vegetable oils such as meadowfoam oil, waxes such as jojoba seed oil, squalane, etc.

[0044] The total content of the oil agents may be 1% by mass or more, 2% by mass or more, or 3% by mass or more, and may be 30% by mass or less, 20% by mass or less, or 10% by mass or less, based on the total amount of the oil-in-water emulsion cosmetic. In a specific embodiment, the total content of the oil agents is 1 to 30 mass %, particularly 2 to 20 mass %, based on the total amount of the oil-in-water emulsion cosmetic. Additional Ingredients

[0045] The oil-in-water emulsion cosmetic may contain an electrolyte. The electrolyte here is a component different from the above-mentioned hydrogenated lecithin, microbial surfactant, polysaccharide, polyol, and oil, and functions as a cosmetic ingredient, pH adjuster, preservative, etc. by ionizing in the oil-in-water emulsion cosmetic.

[0046] The electrolyte may be any electrolyte commonly used in cosmetics, such as organic electrolytes and inorganic electrolytes. Examples of organic electrolytes include malic acid, citric acid, lactic acid, tartaric acid, glycolic acid, edetic acid, succinic acid, ascorbic acid, and salts thereof. In this embodiment, the organic electrolyte includes examples of beauty ingredients, such as vitamin derivatives such as ascorbic acid 2-glucoside and sodium tocopheryl phosphate; amino acids and derivatives thereof such as trimethylglycine and adenosine. Examples of inorganic electrolytes include sodium hydroxide, sodium chloride, magnesium chloride, calcium chloride, potassium aluminum sulfate, and sodium hydrogen phosphate. The electrolyte may be used alone or in combination.

[0047] In a specific embodiment, the oil-in-water emulsion cosmetic does not contain L-ascorbic acid 2-phosphate magnesium sodium salt represented by the following formula (A) as a salt of ascorbic acid. [ka] [In the formula, a and b represent equivalents, a is 0.3 to 1.1, b is 0.8 to 2.4, and the value of 2a+b is 2.7 to 3.3.]

[0048] The content of the electrolyte may be, for example, 0.05% by mass or more, 0.1% by mass or more, or 0.15% by mass or more, and 10% by mass or less, 9% by mass or less, 8% by mass or less, 5% by mass or less, 3% by mass or less, 1% by mass or less, or 0.5% by mass or less, based on the total amount of the oil-in-water emulsion cosmetic. In a specific embodiment, the content of the electrolyte may be 0.05 to 10% by mass, particularly 0.1 to 5% by mass, based on the total amount of the oil-in-water emulsion cosmetic.

[0049] The oil-in-water emulsion cosmetic may further contain other surfactants other than the above-mentioned anionic surfactant derived from a microorganism, such as anionic surfactants, cationic surfactants, and nonionic surfactants. As the other surfactants, those normally used in cosmetics can be used as appropriate. The oil-in-water emulsion cosmetic may not contain a glycerin monofatty acid ester as a surfactant.

[0050] The oil-in-water emulsion cosmetic may further contain a polymer other than the polysaccharide. As the other polymer, any polymer that is normally used in cosmetics can be appropriately used.

[0051] The oil-in-water emulsion cosmetic may contain a monohydric alcohol such as ethanol. The monohydric alcohol functions, for example, as a preservative in the oil-in-water emulsion cosmetic. The oil-in-water emulsion cosmetic may not contain phenoxyethanol or phenoxyisopropanol as the monohydric alcohol.

[0052] In addition to the above-mentioned components, the oil-in-water emulsion cosmetic may appropriately contain additives that are commonly used in cosmetics, such as preservatives such as chlorphenesin and hydroxyacetophenone, antioxidants, colorants, fragrances, etc. The oil-in-water emulsion cosmetic may also contain powders such as inorganic powders and organic powders for the purpose of adjusting the feel, etc. As the powder, powders that are commonly used in cosmetics can be used appropriately.

[0053] In a particular preferred embodiment, it is not in the form of a nanoemulsion. In a nanoemulsion, the oil is generally in the form of droplets having a number average particle size of 250 nm or less, preferably 10 to 200 nm. In a particular preferred embodiment of the present invention, the average particle size of the emulsion particles forming the oil-in-water emulsion is 500 nm or more. This allows the oil-in-water emulsion cosmetic to impart an excellent rich feeling when applied to the skin. The average particle size may be 600 nm or more, or 700 nm or more, or 100 μm or less, 50 μm or less, 10 μm or less, or 5 μm or less.

[0054] "Average particle size" refers to D

[50] , the volume median size that represents the maximum size at which the volume of the particles is 50%. The particle size is measured by dynamic light scattering using a commercially available particle size measuring device (e.g., DelsaMax CORE, manufactured by Beckman Coulter), which is capable of capturing the particle size distribution of all particles over a wide range from 0.01 μm to 1000 pm. The data is processed based on the classical Mie scattering theory. This theory is most suitable for size distributions in the submicron to multimicron range, and allows the determination of the "effective" diameter of the particles. This theory is particularly described in Van de Hulst, HC, "Light Scattering by Small Particles", Chapters 9 and 10, Wiley, New York, 1957. D

[50] represents the maximum particle size that represents 50% of the volume of the particles. The average particle size of emulsion particles can be adjusted by adjusting the stirring conditions during emulsification.

[0055] The oil-in-water emulsion cosmetic according to this embodiment can be produced, for example, by heating the hydrogenated lecithin, the microbially derived anionic surfactant, the glycerin-containing polyol, the oily component, and the water (for example, at 60 to 100°C) and mixing them uniformly, and then adding the other ingredients and stirring to mix.

[0056] The method for obtaining the oil-in-water emulsion cosmetic of this embodiment ("non-nano emulsion") does not require substantial mechanical energy for production, such as high-pressure emulsification that requires nanoization, as is required for obtaining a nanoemulsion. In a specific embodiment, the oil-in-water emulsion cosmetic of the present invention is obtained by mixing and stirring at 1000 rpm to 5000 rpm, particularly 1000 rpm to 3000 rpm, until homogenized. Another embodiment of the present invention, a method for obtaining an oil-in-water emulsion cosmetic in a nanoemulsion form that is highly stable, non-sticky, and has little richness when applied, includes the use of substantial mechanical energy, particularly high-pressure emulsification, as further described in Example 2, and this high-pressure emulsification is, for example, high-pressure emulsification three times at 200 MPa using a high-pressure emulsifier (Starburst mini, manufactured by Sugino Machine Co., Ltd.).

[0057] The viscosity of the oil-in-water emulsion cosmetic according to this embodiment at 25° C. may be, for example, 1 to 100,000 mPa·s. The viscosity of the oil-in-water emulsion cosmetic at 25° C. is preferably 10 mPa·s or more, 50 mPa·s or more, or 100 mPa·s or more, and is preferably 50,000 mPa·s or less, 10,000 mPa·s or less, or 1,000 mPa·s or less. The viscosity can be measured by shear viscosity measurement using a rotational viscometer (e.g., Rheolab QC, manufactured by Anton Paar, rotation speed 100 rpm).

[0058] The oil-in-water emulsion cosmetic can be used as a skin care cosmetic or a makeup cosmetic, for example, a lotion, milky lotion, beauty essence, makeup remover, makeup base, sunscreen, foundation, concealer, or the like.

[0059] The present invention also relates to a cosmetic method for caring for and / or making up keratinous materials, which comprises applying an oil-in-water emulsion cosmetic composition as defined herein to keratinous materials, in particular to the skin. When the oil-in-water emulsion cosmetic is applied, the cosmetic is less sticky after application. In a particular embodiment, when the oil-in-water emulsion cosmetic is in the form of a non-nanoemulsion, the composition even provides an excellent feeling of body during application, which is particularly advantageous for dry and combination skin. EXAMPLES

[0060] The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

[0061] <Preparation of oil-in-water emulsion cosmetic> For Example 1 and Comparative Examples 1 to 4, oil-in-water emulsion cosmetics were obtained by the following method based on the compositions shown in Table 1. The components listed in the compositions are expressed as mass % relative to the total mass of the composition. Comparative Example 1: No microbial anionic surfactant Comparative Example 2: No hydrogenated lecithin Comparative Example 3: No polyol included Comparative Example 4: No glycerin

[0062] As Example 1, first, hydrogenated soybean lecithin (Emulmetik TM (950, Lucas Meyer Cosmetics Canada), sodium surfactin (Kaneka Surfactin, Kaneka Corporation), polyol (A), and oil (B) were each heated to 80°C, and (B) was added to (A) and mixed uniformly at 3000 rpm using a stirrer. Next, water (C) heated to 80°C was added to this mixture and further mixed under the same conditions. Next, polysaccharide (D) was added to this mixture and stirred at 80°C and 3000 rpm, and the mixture was cooled to room temperature. Finally, preservatives, ethanol and fragrance (E), and electrolyte (F) were added and mixed uniformly at 1000 rpm using a stirrer.

[0063] As Example 2, a nanoemulsion-type oil-in-water emulsion cosmetic was obtained by the following method including high-pressure emulsification based on the composition shown in Table 1. First, hydrogenated soybean lecithin, sodium surfactin, and polyol (A) and oil (B) were each heated to 80°C, and (B) was added to (A) and mixed uniformly at 3000 rpm using a stirrer. Half of the water (C) heated to 80°C was added to the mixture, and mixing was continued under the same conditions. Next, this mixture was subjected to high-pressure emulsification treatment three times at 200 MPa using a high-pressure emulsifier (Starburst mini, manufactured by Sugino Machine Co., Ltd.). Meanwhile, polysaccharide (D) was added to the remaining half of the water (C), and mixed uniformly at 80°C and 3000 rpm using a stirrer, and then cooled to room temperature to prepare a polysaccharide solution. To this polysaccharide solution, the preservative, ethanol and fragrance (E), and the electrolyte (F) were added, and the mixture was mixed at 1000 rpm using a stirrer until it became uniform, and then the mixture after the high-pressure emulsification treatment was added thereto.

[0064] <Measurement of average particle size> The average particle size (D

[50] ) of the emulsion particles of the prepared oil-in-water emulsion cosmetics was measured by dynamic light scattering using a particle size measuring device (DelsaMax CORE: manufactured by Beckman Coulter). The average particle size of each cosmetic is shown in Table 1.

[0065] <Evaluation of emulsion stability> The cosmetic compositions according to the Examples and Comparative Examples were filled into transparent glass containers and sealed. These were placed in a thermostatic chamber at 50°C and left to stand for one month. After standing, the emulsion stability was evaluated visually based on the following evaluation criteria. A rating of B indicates excellent emulsion stability, and a rating of A indicates particularly excellent emulsion stability. A: Particularly excellent emulsion stability B: Excellent emulsion stability C: Some degree of emulsion stability D: No emulsion stability, such as coalescence or separation

[0066] <Sensory evaluation> The oil-in-water emulsion cosmetics according to the Examples and Comparative Examples were evaluated by sensory evaluation for richness upon application and non-stickiness after application. In the sensory evaluation, an evaluation panel of cosmetic experts applied each cosmetic to the skin and evaluated it based on the following evaluation criteria. A rating of "B" corresponds to no stickiness or excellent richness, and a rating of "A" corresponds to particularly no stickiness or particularly excellent richness. (1) No stickiness after application A: Not sticky at all B: Almost non-sticky C: Slightly sticky D: Sticky (2) Richness when applied A: Particularly excellent richness B: Excellent richness C: Slightly full-bodied D: No richness at all

[0067] From the results shown in Table 1, it can be seen that by combining hydrogenated lecithin, an anionic surfactant derived from a microorganism, and a polyol and polysaccharide containing at least glycerin, an oil-in-water emulsion cosmetic having excellent emulsion stability and less stickiness after application can be obtained compared to other comparative examples. In addition, when the richness upon application was evaluated, the oil-in-water emulsion cosmetic of the present invention (Example 1) that is not a nanoemulsion had a better richness upon application compared to the case where the same composition was made into a nanoemulsion (Example 2). Therefore, depending on the required performance (stability, non-stickiness, and richness upon application if necessary) and the type of skin to be applied (dry skin, combination skin, or oily skin), either the nanoemulsion composition embodiment or the non-nanoemulsion composition embodiment is preferred.

[0068] [Table 1]

Claims

1. In a cosmetically acceptable medium, a) hydrogenated lecithin, b) anionic surfactants of microbial origin; c) at least one polyol comprising glycerin, and d) contains polysaccharides; The content of the anionic surfactant in the oil-in-water emulsion cosmetic is preferably in the range of 0.005% by mass or more and 1% by mass or less, based on the total amount of the oil-in-water emulsion cosmetic.

2. 2. The oil-in-water emulsion cosmetic according to claim 1, wherein the emulsion particles have an average particle size of at least 500 nm.

3. 3. The oil-in-water emulsion cosmetic according to claim 1, wherein the polysaccharide is selected from the group consisting of xanthan gum, alcaligenes polysaccharides, sodium hyaluronate, and mixtures thereof.

4. The oil-in-water emulsion cosmetic according to any one of claims 1 to 3, wherein the anionic surfactant is sodium surfactin.

5. 5. The oil-in-water emulsion cosmetic according to claim 1, comprising glycerin and at least one other polyol selected from butylene glycol, propanediol, and a mixture thereof.

6. The oil-in-water emulsion cosmetic according to any one of claims 1 to 5, wherein the total content of the polyol is in the range of 5% by mass or more and 30% by mass or less, based on the total amount of the oil-in-water emulsion cosmetic.

7. The oil-in-water emulsion cosmetic according to any one of claims 1 to 6, further comprising an electrolyte.

8. The oil-in-water emulsion cosmetic according to any one of claims 1 to 7, which is in the form of a skin care cosmetic or a makeup cosmetic, such as a lotion, a milky lotion, a beauty essence, a makeup remover, a makeup base, a sunscreen, a foundation, or a concealer.

9. A cosmetic method for caring for and / or making up keratinous materials, comprising applying the oil-in-water emulsion cosmetic composition according to any one of claims 1 to 8 to keratinous materials, particularly skin.

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