Cosmetic composition

Abstract

The present invention provides a cosmetic composition that can maintain high moisturizing properties even after being washed off with water. [Solution] The cosmetic composition of the present invention contains a biosurfactant having a mannose skeleton and a water-retaining agent. For example, the water-retaining agent is a sugar alcohol, rare sugar, isomerized sugar, alkyl glycoside, sucrose fatty acid ester, or hyaluronic acid and derivatives thereof, and the biosurfactant contains mannosylerythritol lipid (MEL).

Description

[Technical Field]

[0001] This invention relates to cosmetic compositions. [Background technology]

[0002] From the perspective of diversifying pharmaceutical formulations and developing safe and effective ingredients, research and development using fermented products produced by microorganisms as cosmetic ingredients has been actively pursued in recent years.

[0003] Biosurfactants are one example of components produced by such microorganisms. Biosurfactants, which are surfactants derived from microorganisms, are being researched as highly safe and biodegradable surfactants.

[0004] In recent years, mannosylerythritol lipid (hereinafter also referred to as "MEL"), which has a mannose skeleton, has become known as a biosurfactant in the field of cosmetics, such as a moisturizing ingredient. For example, Patent Documents 1 to 3 disclose such cosmetic compositions containing MEL. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] International Publication No. 2007 / 060956 [Patent Document 2] Japanese Patent Publication No. 2011-026277 [Patent Document 3] Japanese Patent Publication No. 2019-19104 [Overview of the project] [Problems that the invention aims to solve]

[0006] Conventional cosmetic compositions containing MEL have been used as leave-on cosmetics.

[0007] The present invention aims to provide a cosmetic composition that can maintain high moisturizing properties even after being washed off with water. [Means for solving the problem]

[0008] The present invention has the following aspects: 《Aspect 1》 A cosmetic composition containing a biosurfactant having a mannose skeleton and a water-retaining agent. 《Aspect 2》 The cosmetic composition according to Embodiment 1, wherein the water-retaining agent is a sugar alcohol, a rare sugar, an isomerized sugar, an alkyl glycoside, a sucrose fatty acid ester, or hyaluronic acid or derivatives thereof. 《Aspect 3》 The cosmetic composition according to embodiment 1, wherein the biosurfactant comprises MEL. Appearance 4 A cosmetic composition according to any one of embodiments 1 to 3, which is a detergent composition. 《Aspect 5》 The cosmetic composition according to embodiment 4, which is an oily semi-solid form. 《Aspect 6》 The cosmetic composition according to embodiment 5, further comprising a solid oil, a liquid oil, and a nonionic surfactant. Appearance 7 The cosmetic composition according to embodiment 6, further comprising 1 to 30% by mass of solid oil, 50 to 95% by mass of liquid oil, and 3 to 30% by mass of nonionic surfactant. [Effects of the Invention]

[0009] The present invention can provide a cosmetic composition that can maintain high moisturizing properties even after being washed off with water. [Modes for carrying out the invention]

[0010] The cosmetic composition of the present invention contains a biosurfactant having a mannose skeleton and a water-retaining agent.

[0011] The inventors of the present invention have found that by using a biosurfactant having a mannose skeleton such as MEL together with a water-holding agent having the property of holding water, a cosmetic composition containing them can provide high moisturizing properties. In particular, it has been found that this cosmetic composition can maintain high moisturizing properties even when washed away with water. This is presumably because the water-holding agent adsorbs to keratin, which is the main component of the stratum corneum of the epidermis, and the keratin to which the water-holding agent is adsorbed strongly adsorbs the biosurfactant having a mannose skeleton.

[0012] 〈Biosurfactant〉 The biosurfactant having a mannose skeleton is not particularly limited as long as it contains a mannose skeleton and has a surfactant function. Here, the biosurfactant is a general term for substances having a surfactant function produced by organisms, can exhibit biodegradability, and can have various physiological actions.

[0013] Examples of such biosurfactants include mannosylerythritol lipid (MEL), mannosylmannitol lipid (MML), mannosylsorbitol lipid (MSL), mannosylarabitol lipid (MAraL), mannosyllitol lipid (MRL), and the like. Among these, MEL is particularly preferred.

[0014] MEL is classified into four types, MEL-A, MEL-B, MEL-C, and MEL-D, based on the presence or absence of acetyl groups at the 4th and 6th positions of mannose. Among these, MEL-B is particularly preferred. The structure of MEL is shown below.

[0015]

Chem.

[0016] In the above formula, R 1 is an aliphatic acyl group having 4 to 24 carbon atoms, which may be the same or different. For MEL-A, in the formula, R 2 and R 3are both acetyl groups; for MEL-B, R 2 is an acetyl group and R 3 is hydrogen; for MEL-C, R 2 is hydrogen and R 3 is an acetyl group; for MEL-D, R 2 and R 3 are both hydrogen.

[0017] The biosurfactant may be contained in the cosmetic composition at 0.01% by mass or more, 0.03% by mass or more, 0.05% by mass or more, or 0.10% by mass or more, and may also be contained at 1.0% by mass or less, 0.50% by mass or less, 0.30% by mass or less, 0.20% by mass or less, 1.0% by mass or less, or 0.05% by mass or less.

[0018] <Water-holding agent> The water-holding agent is not particularly limited as long as it can hold (store, bind, hydrate) water. Examples include saccharide-based substances. Such saccharide-based water-holding agents include sugar alcohols, rare sugars, isomerized sugars, alkyl glycosides, sucrose fatty acid esters, hyaluronic acid, and their derivatives. These may be used alone or in combination of two or more. The water-holding agent is different from water-soluble polymers that do not have the above-mentioned water-holding property. From the perspective of water-holding property, sugar alcohols, rare sugars, and isomerized sugars can be particularly mentioned.

[0019] Examples of sugar alcohols include erythritol, reduced palatinose, sorbitol, mannitol, octitol, lactitol, sucrose, maltitol, xylobiitol, maltotriitol, etc. Also, reduced maltose, reduced starch syrup, hydrolyzed hydrogenated starch, etc. containing these can be used. However, from the balance between water-holding property and lipophilicity, it is preferable to use sugar alcohols having 5 to 25 carbon atoms, 6 to 18 carbon atoms, or 6 to 12 carbon atoms.

[0020] Rare sugars are monosaccharides and their derivatives that are found in small quantities in nature. Examples of rare sugars include D-psicose, D-allose, D-tagatose, and L-ribose.

[0021] Isomerized sugar is a sugar whose main component is glucose or fructose, obtained by isomerizing a sugar solution, which is mainly glucose, obtained by hydrolyzing starch with an enzyme such as amylase or an acid, using glucose isomerase or an alkali. There are no particular limitations on such isomerized sugars, but examples include glucose syrup, fructose syrup, hyfructose, and corn syrup.

[0022] Alkyl glycosides are formed by ether-bonding an alkyl group to a sugar residue. Examples of sugar residues include those selected from galactose, xylose, mannose, lyxose, arabinose, fructose, maltose, xylobiose, isomaltose, cellobiose, lactose, gentiobis, maltotriose, isomalttriose, cellotriose, maltotetraose, maltopentaose, maltohexaose, maltoheptaose, isomalttetraose, isomaltopentaose, isomalthexaose, and isomaltheptase. Examples of alkyl groups include branched alkyl groups having 8-24, 10-20, or 10-16 carbon atoms.

[0023] Examples of sucrose fatty acid esters include mono-, di-, or tri-esters of fatty acids having 8 to 18 carbon atoms and sucrose. More specifically, sucrose polylauryl acid, sucrose laurate, sucrose myristate, sucrose palmitate, sucrose distearate, sucrose stearate, etc. are preferred, but are not limited to these.

[0024] Hyaluronic acid and its derivatives are preferably hyaluronic acid, acetylated hyaluronic acid, etc., but are not limited to these.

[0025] The water-retaining agent may be included in the cosmetic composition in an amount of 0.01% by mass or more, 0.03% by mass or more, 0.05% by mass or more, or 0.10% by mass or more, and may also be included in an amount of 1.0% by mass or less, 0.50% by mass or less, 0.30% by mass or less, 0.20% by mass or less, 1.0% by mass or less, or 0.05% by mass or less.

[0026] The ratio of the mass of the water-retaining agent in the cosmetic composition to the mass of the biosurfactant (mass of water-retaining agent / mass of biosurfactant) may be 0.1 or more, 0.2 or more, 0.3 or more, or 0.5 or more, and may be 10 or less, 5.0 or less, 3.0 or less, or 2.0 or less.

[0027] <Dosage form> The dosage form of the cosmetic composition is not particularly limited. For example, the cosmetic composition may be in various forms such as oily liquid, oily semi-solid, emulsified cream, lotion, aqueous liquid, or gel. The cosmetic composition may be a so-called leave-on cosmetic, or a leave-off cosmetic, such as a cleansing composition that is rinsed off with water.

[0028] <Dosage Form - Oily Composition> Cosmetic compositions can be oily compositions, particularly oily semi-solid compositions. Oily compositions, especially oily semi-solid cleansing compositions, can provide moisturizing properties to the skin because oil remains even after rinsing with water. Therefore, the idea of ​​adding biosurfactants for further moisturizing had not been considered. However, it has been found that using them together with water-retaining agents can provide extremely high moisturizing properties.

[0029] The oily composition may be a liquid cosmetic oil or a semi-solid balm. When the cosmetic composition is an oily semi-solid, it may contain solid oil, liquid oil, and a nonionic surfactant. For example, the cosmetic composition may contain 1 to 30% by mass of solid oil and 50 to 95% by mass of liquid oil, and further contain 3 to 30% by mass of a nonionic surfactant. When the cosmetic composition is an oily semi-solid, it can have the same composition and manufacturing method as commercially available cleansing balms, except that it does not contain the essential oils described above. When the cosmetic composition is a liquid cosmetic oil, it may have the same composition as a balm, except that it does not contain solid oil.

[0030] Examples of solid oils include oils that are solid at room temperature (25°C).

[0031] The solid oil content in the cosmetic composition may be 1% by mass or more, 3% by mass or more, 5% by mass or more, 7% by mass or more, or 10% by mass or more, and may also be 30% by mass or less, 20% by mass or less, 15% by mass or less, or 10% by mass or less. For example, the solid oil content in the cosmetic composition can be 1% by mass or more and 30% by mass or less, 3% by mass or more and 20% by mass or less, or 5% by mass or more and 15% by mass or less.

[0032] The melting point of the solid oil may be 40°C or higher, 50°C or higher, 60°C or higher, or 70°C or higher, and may also be 120°C or lower, 110°C or lower, 100°C or lower, or 90°C or lower. Here, the melting point of the solid oil can be measured by the second method of melting point measurement, which is a general test method of the standards for raw materials of quasi-drugs. The melting point of the solid oil can be, for example, 40°C or higher and 120°C or lower, 50°C or higher and 110°C or lower, or 60°C or higher and 100°C or lower.

[0033] When the solid oil content and melting point are within the above range, the liquid oil can be uniformly solidified, providing sufficient storage stability and shape retention, and giving it an appropriate hardness when in use.

[0034] Specifically, as the solid oil, solid oils commonly used in solid oil-based cleansing agents can be used, such as hydrocarbon waxes like paraffin wax, polyethylene wax, and Fischer-Tropsch wax, as well as carnauba wax, candelilla wax, rice wax, beeswax, hydrogenated jojoba oil, hydrogenated oil, higher alcohols, and silicone wax. Two or more of these may be combined. Oily semi-solid cosmetic compositions require prolonged heating during the filling process into containers, and from the viewpoint of oxidation resistance during heating, hydrocarbon waxes are preferred.

[0035] Examples of liquid oils include oils that are fluid at room temperature (25°C) and semi-solid oils with a melting point of less than 50°C or less than 40°C.

[0036] The liquid oil content in the cosmetic composition may be 50% by mass or more, 55% by mass or more, 60% by mass or more, 65% by mass or more, or 70% by mass or more, and may be 95% by mass or less, 90% by mass or less, 85% by mass or less, or 80% by mass or less. For example, the liquid oil content in the cosmetic composition can be 50% by mass or more and 95% by mass or less, 55% by mass or more and 90% by mass or less, or 60% by mass or more and 85% by mass or less.

[0037] When the liquid oil content is within the range described above, the cosmetic composition can be given properties such as ease of mixing with other cosmetics and ease of spreading when applied to the skin.

[0038] The mass ratio of solid oil to liquid oil may be 0.05 or more, 0.10 or more, 0.15 or more, 0.20 or more, or 0.25 or more, and may also be 0.50 or less, 0.40 or less, 0.30 or less, 0.25 or less, or 0.20 or less. For example, this mass ratio may be 0.05 or more and 0.50 or less, or 0.10 or more and 0.30 or less.

[0039] Specifically, the liquid oil used can be the liquid oil typically used in solid oil-based cleansing agents, and may be animal oil, vegetable oil, or synthetic oil. Examples include esters such as tri(caprylic / capric acid) glyceryl, triethylhexanoin, diglyceryl triisostearate, decaglyceryl decaisostearate, cetyl isooctanoate, isopropyl myristate, isopropyl palmitate, cholesterol fatty acid esters, and jojoba oil; hydrocarbons such as volatile isoparaffin, polybutene, polyisobutylene, squalane, and petrolatum; oils and fats such as olive oil, castor oil, mink oil, and macadamia nut oil; fatty acids such as isostearic acid and oleic acid; higher alcohols such as oleyl alcohol and isostearyl alcohol; silicone oils such as low-polymerization dimethylpolysiloxane, methyl trimethicone, caprylyl trimethicone, and fluorine-modified polysiloxane; fluorinated oils such as perfluoropolyether; and lanolin derivatives such as lanolin, lanolin acetate, isopropyl lanolin fatty acid, and lanolin alcohol. Two or more of these may be combined.

[0040] In this specification, nonionic surfactants mean nonionic surfactants other than the biosurfactants described above, and can provide a cleansing effect to cosmetic compositions. Preferably, the nonionic surfactant is of a type that can provide a cleansing effect to the skin while allowing the water-retaining agent and biosurfactant to blend into the skin.

[0041] The HLB value of the nonionic surfactant used may be, for example, 3.0 or higher, 5.0 or higher, 7.0 or higher, 8.0 or higher, or 9.0 or higher, and may also be 15.0 or lower, 14.0 or lower, 13.0 or lower, 12.0 or lower, 11.0 or lower, or 10.0 or lower. The range of the HLB value of the nonionic surfactant can be, for example, 5.0 or higher and 15.0 or lower, 7.0 or higher and 13.0 or lower, or 8.0 or higher and 11.0 or lower. Here, for example, "the range of the HLB value of the nonionic surfactant is 5.0 or higher and 15.0 or lower" means that it is either one type of nonionic surfactant with an HLB value in the range of 5 to 15, a combination of multiple nonionic surfactants having HLB values ​​in that range, or a combination of multiple nonionic surfactants whose weighted average HLB value is in the range of 5 to 15 as a result of combining two or more nonionic surfactants with different HLB values.

[0042] HLB is an index that indicates the balance between hydrophilicity and lipophilicity on a scale of 0 to 20. A value closer to 0 indicates higher lipophilicity, while a value closer to 20 indicates higher hydrophilicity. Various calculation methods are known for determining the HLB value, and the value is also listed in catalogs provided by manufacturers. A nonionic surfactant with an appropriate HLB value can be selected according to the polarity of the solid or liquid oil.

[0043] The content of nonionic surfactants in a cosmetic composition may be 3% by mass or more, 5% by mass or more, 7% by mass or more, 10% by mass or more, or 15% by mass or more, and may also be 30% by mass or less, 25% by mass or less, 20% by mass or less, or 15% by mass or less. For example, the content of nonionic surfactants in a cosmetic composition can be 3% by mass or more and 30% by mass or less, 5% by mass or more and 25% by mass or less, or 7% by mass or more and 20% by mass or less.

[0044] When the liquid oil content is within the range described above, the cosmetic composition can be given properties such as ease of mixing with other cosmetics and ease of spreading when applied to the skin.

[0045] The mass ratio of the nonionic surfactant to the solid oil may be 0.5 or more, 0.8 or more, 1.0 or more, 1.2 or more, or 1.5 or more, and may also be 5.0 or less, 4.0 or less, 3.0 or less, 2.5 or less, or 2.0 or less. For example, this mass ratio may be 0.5 or more and 5.0 or less, or 0.80 or more and 3.0 or less.

[0046] The mass ratio of the nonionic surfactant to the liquid oil may be 0.05 or higher, 0.10 or higher, 0.15 or higher, 0.20 or higher, or 0.25 or higher, and may also be 0.60 or lower, 0.50 or lower, 0.40 or lower, 0.30 or lower, or 0.25 or lower. For example, this mass ratio may be 0.05 or higher and 0.60 or lower, or 0.10 or higher and 0.30 or lower.

[0047] Specifically, nonionic surfactants can be those commonly used in solid oil-based cleansing agents, such as polyoxyethylene sorbitan fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyoxyethylene alkyl ethers, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene polyoxypropylene alkyl ethers, polyglycerin fatty acid esters, polyethylene glycol fatty acid esters, etc. Two or more of these may be combined.

[0048] The cosmetic composition of the present invention may contain additives commonly used in cosmetics, such as water, dyes, oily gelling agents, oil-soluble resins, polyhydric alcohols, lower alcohols, UV absorbers, UV scattering agents, humectants, fragrances, antioxidants, preservatives, defoaming agents, and various extracts, to the extent that they do not impair the effects of the present invention.

[0049] When a cosmetic composition is an oily semi-solid, it does not exhibit fluidity at room temperature (25°C) and normal pressure (1 atm), and its shape is not particularly limited. Specific examples of shapes include stick-shaped, rod-shaped, plate-shaped, and those formed by pouring into containers.

[0050] Oily semi-solid cosmetic compositions can be prepared according to conventional methods. For example, all raw materials can be heated above their melting point, mixed uniformly, and then poured into a designated container such as a jar, a metal dish, or a resin dish while still molten. The mixture can then be cooled to obtain an oily semi-solid cosmetic composition.

[0051] <Dosage form - aqueous composition> Cosmetic compositions can be aqueous compositions. Aqueous compositions may be leave-off products such as liquid cleansers, or leave-on products such as lotions. Such aqueous compositions can be used to replenish moisture and moisturizing components in the stratum corneum of the skin and to assist the physiological functions of the skin. Specific examples of aqueous compositions include cleansing lotions, astringent lotions, softening lotions, and multi-layered lotions, as well as skin lotions, body lotions, hand lotions, and emollient lotions.

[0052] The aqueous composition may contain, in addition to water and / or alcohol, the above-mentioned biosurfactant and water-retaining agent. The aqueous composition may also contain other moisturizing ingredients in addition to the above-mentioned biosurfactant and water-retaining agent. Furthermore, depending on its purpose and function, the aqueous composition may contain emollients, solubilizers, buffers, thickeners, etc.

[0053] The aqueous composition may contain water in amounts of 30% by mass or more, 50% by mass or more, 70% by mass or more, or 95% by mass or less, 90% by mass or less, or 80% by mass or less. The aqueous composition may also contain alcohol in amounts of 1% by mass or more, 3% by mass or more, 5% by mass or more, or 20% by mass or less, 15% by mass or less, or 10% by mass or less. Examples of alcohol include ethanol and isopropanol.

[0054] The aqueous composition may contain other moisturizing components of the above-mentioned biosurfactant and water-retaining agent in amounts of 1% or more by mass, 3% or more by mass, 5% or more by mass, or 20% or less by mass, 15% or less by mass, or 10% or less by mass.

[0055] As the emollient (softening) agent, substances known as emollients (softening) agents for aqueous compositions, such as ester oils and vegetable oils, can be used. The aqueous composition may contain the emollient (softening) agent in amounts of 0.01% by mass or more, 0.05% by mass or more, or 0.1% by mass or more, or 1.0% by mass or less, 0.5% by mass or less, or 0.3% by mass or less.

[0056] The aqueous composition may contain nonionic surfactants as solubilizers, such as polyoxyethylene oleyl alcohol ether, polyoxyethylene alkyl ether, polyoxyethylene fatty acid ester, polyoxyethylene sorbitan fatty acid ester, glycerin fatty acid ester, polyglycerin fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitol fatty acid ester, etc. The aqueous composition may contain the solubilizer in amounts of 0.1% by mass or more, 0.5% by mass or more, or 1.0% by mass or more, or 3.0% by mass or less, 2.0% by mass or less, or 1.0% by mass or less.

[0057] The aqueous composition may contain citric acid, lactic acid, amino acids, etc., as buffering agents. These can be added to the aqueous composition in appropriate amounts to adjust the pH.

[0058] The aqueous composition may contain, as a thickening agent, alginate, cellulose derivative, quince seed gum, pectin, pullulan, xanthan gum, bee gum, carboxyvinyl polymer, acrylic acid polymer, laponite, etc. These can be added to the aqueous composition in appropriate amounts to adjust the viscosity, for example, at 0.1% by mass or more, 0.5% by mass or more, or 1.0% by mass or more, or 3.0% by mass or less, 2.0% by mass or less, or 1.0% by mass or less.

[0059] The aqueous composition may further contain other components known in this field, such as fragrances, preservatives, and brown preservatives.

[0060] <Cosmetic composition - Emulsion> The cosmetic composition may be a lotion. A lotion is an emulsion that has characteristics intermediate between a toner and a cream. Except in special cases, lotions have a lower oil phase content than creams and are fluid emulsions, so they are also called "liquid creams." There are both O / W and W / O types of emulsification, but generally it is the O / W type, and because the proportion of the water phase is high, when applied to the skin it spreads thinly and gives a moist feeling.

[0061] The emulsion may contain water, oil, emulsifiers, and the above-mentioned active ingredients for skin. In addition to the biosurfactant and water-retaining agent, the emulsion may also contain other moisturizing ingredients. Furthermore, depending on its purpose and function, the emulsion may contain thickeners and the like.

[0062] The emulsion may contain water in amounts of 30% by mass or more, 50% by mass or more, or 70% by mass or more, or 95% by mass or less, 90% by mass or less, or 80% by mass or less.

[0063] The oil content may be liquid or solid, and examples include stearic acid, cetyl alcohol, petrolatum, squalane, cetyl alcohol, beeswax, dimethylpolysiloxane, liquid paraffin, lanolin, etc. The lotion may contain oil content in amounts of 3% or more by mass, 5% or more by mass, 10% or more by mass, 20% or more by mass, or 30% or more by mass, or 60% or less by mass, 50% or less by mass, 40% or less by mass, 30% or less by mass, or 20% or less by mass.

[0064] The emulsifier may include nonionic surfactants such as polyoxyethylene oleyl alcohol ether, polyoxyethylene alkyl ether, polyoxyethylene fatty acid ester, polyoxyethylene sorbitan fatty acid ester, glycerin fatty acid ester, polyglycerin fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyoxyethylene hydrogenated castor oil, and polyoxyethylene sorbitol fatty acid ester. The emulsion may contain the emulsifier in an amount of 1.0% or more by mass, 2.0% or more by mass, or 3.0% or more by mass, or 10% or less by mass, 7.0% or less by mass, or 5.0% or less by mass.

[0065] The type and amount of thickener used in the emulsion can be determined by referring to the type and amount of thickener described for the lotion.

[0066] The emulsion may also contain other ingredients known in this field, such as fragrances, preservatives, antioxidants, neutralizing agents, and colorants.

[0067] <Cosmetic composition - cream> Cosmetic compositions may also be creams. Creams generally have a higher oil phase content than lotions and are therefore non-fluid emulsions. The purposes of use of creams are the same as those of lotions: cleansing the skin, removing makeup, protecting the skin, moisturizing and softening the skin, and promoting blood circulation in the skin. More specifically, examples include cleansing creams, emollient creams, nourishing creams, night creams, base creams, vanishing creams, moisturizing creams, massage creams, cold creams, and lip balms.

[0068] The cream may contain water, oil, emulsifier, the biosurfactant and water-retaining agent described above. The types of oil and emulsifier can be referenced from those described for the emulsion.

[0069] The cream may contain water in amounts of 10% by mass or more, 20% by mass or more, 30% by mass or more, or 50% by mass or more, and 80% by mass or less, 50% by mass or less, or 30% by mass or less. The cream may contain oil in amounts of 20% by mass or more, 30% by mass or more, 40% by mass or more, 50% by mass or more, or 60% by mass or more, and 80% by mass or less, 60% by mass or less, 50% by mass or less, 40% by mass or less, or 30% by mass or less. The amount of emulsifier in the cream can be determined by referring to the amount described for the emulsion above.

[0070] The type and amount of thickener used in the cream can be determined by referring to the type and amount of thickener described for the lotion.

[0071] The cream may also contain other ingredients known in this field, such as chelating agents, fragrances, preservatives, antioxidants, neutralizing agents, and colorants.

[0072] <Cosmetic composition - gel> The cosmetic composition may be a gel. The gel has a uniform appearance, is transparent to translucent, and provides a fresh feel. There are two types of gels: water-based gels and oil-based gels. Water-based gels contain a large amount of water, while oil-based gels contain a large amount of oil.

[0073] The aqueous gel may contain water, a water-soluble polymer, the biosurfactant and water-retaining agent. The oily gel may contain oil, an emulsifier, the biosurfactant and water-retaining agent. The types of oil and emulsifier can be referenced from the types described for the emulsion above.

[0074] The aqueous gel may contain water in amounts of 30% or more by mass, 50% or more by mass, or 70% or more by mass, or 95% or less by mass, 90% or less by mass, or 80% or less by mass.

[0075] Examples of water-soluble polymers used in aqueous gels include agar, agarose, alginic acids, carrageenan, dextrin, methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, polyvinyl alcohol, polyacrylic acid, polymethacrylic acid, carboxyvinyl polymer, (acrylic acid / alkyl acrylate (C10-30)) copolymer, xanthan gum, carboxymethyl chitin, and chitosan.

[0076] The aqueous gel may contain a water-soluble polymer in amounts of, for example, 0.1% by mass or more, 0.5% by mass or more, or 1.0% by mass or more, or 3.0% by mass or less, 2.0% by mass or less, or 1.0% by mass or less.

[0077] The oily gel may contain oil in amounts of 30% or more by mass, 50% or more by mass, 70% or more by mass, or 95% or less by mass, 90% or less by mass, or 80% or less by mass. The amount of emulsifier in the oily gel can be determined by referring to the amount described for the emulsion above.

[0078] The gel may also contain other ingredients known in this field, such as fragrances, preservatives, antioxidants, neutralizing agents, and colorants.

[0079] <Cosmetic composition - Pack cosmetic> The cosmetic composition may be a pack cosmetic. The pack cosmetic may be a topical application type that forms a film when applied to the skin, or a patch type that is contained in a base material such as a nonwoven fabric.

[0080] The cosmetic pack may contain water, alcohol, water-soluble polymer, oil, powder, the above-mentioned biosurfactant, and water-retaining agent. Here, the types and amounts of water and alcohol may refer to those described for lotions, the types and amounts of water-soluble polymer may refer to those described for aqueous gels, and the types and amounts of oil may refer to those described for emulsions.

[0081] Examples of powders used in cosmetic packs include kaolin, talc, titanium dioxide, zinc oxide, and spherical cellulose. Cosmetic packs may contain the powder in amounts of 5% or more by mass, 10% or more by mass, 15% or more by mass, or 30% or less by mass, 20% or less by mass, or 15% or less by mass.

[0082] The cosmetic pack may also contain other ingredients known in this field, such as fragrances, preservatives, antioxidants, neutralizing agents, and colorants.

[0083] The present invention will be described in more detail by the following examples, but the present invention is not limited thereto. [Examples]

[0084] 《Manufacturing》 Each of the components listed in Tables 1 and 2 was heated and dissolved according to its dosage form, and then cooled to room temperature while stirring to produce the cosmetic composition for each example.

[0085] "evaluation" <Water-retaining properties of the stratum corneum> The following procedure was used to confirm whether the composition improved the water-retention capacity of the stratum corneum in the skin to which it was applied. Specifically, the first layer of stratum corneum was collected from the outer part of the subject's forearm using the tape stripping method and attached to cellophane tape (registered trademark) (CT-18, manufactured by Nichiban Co., Ltd.). The tape with the stratum corneum attached was cut to a width of 1.8 cm and a length of 2.5 cm, attached to a glass slide (MAS-01, manufactured by Matsunami Co., Ltd.), and immersed in xylene (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) and left overnight. After confirming that the stratum corneum had been transferred to the glass slide, it was immersed in xylene (10 minutes x 2) and air-dried. The weight of each glass slide was measured to confirm the weight change and the transfer status of the stratum corneum, and it was divided into three groups (n=3 in each group) to ensure uniformity, and washed by immersion in distilled water. 25 mL of a 10-fold dilution of each example's composition with distilled water was dispensed into a 50 mL Falcon tube. The grouped microscope slides were immersed in each solution and incubated at 40°C for 10 minutes. The incubated slides were washed 14 times by passing them through wash bottles dispensed with distilled water. The slides were then immersed once in fresh distilled water, tapped five times on a Kimwipe to remove excess water, and the bottom and any areas free of keratin deposits were wiped with a Kimwipe. The weight of the slides was then measured.

[0086] (Evaluation criteria) Percentage increase in water retention The percentage increase in moisture content was measured, with the moisture content of the uncoated sample set to 100.

[0087] <The feeling of moisture on the skin after washing with water> Approximately 1.5 ml of each composition was applied to the entire face and evaluated on a 5-point scale. For leave-off products, the skin was evaluated after washing with water, and for leave-on products, the skin was evaluated immediately after application. These evaluations were conducted by 14 expert panelists, and the average score was used as the evaluation result.

[0088] (Evaluation Criteria) 1: Very dry 2: Slightly dry 3: Neither 4: Feels slightly moist. 5: Feels naturally moisturized

[0089] <Odor suppression effect at 50℃> Each composition was placed in a 100ml glass sample bottle (80g) and stored at 50°C for 30 days. The odor was then evaluated by sensory assessment according to the following criteria.

[0090] ○; No difference compared to immediately after creation. △; A distinctive odor was detected compared to immediately after preparation. ×; A distinctive base odor was detected even without comparing it to the product immediately after preparation.

[0091] "result" The composition and measurement results for each example are shown in Tables 1 and 2 below.

[0092] [Table 1]

[0093] [Table 2]

[0094] Furthermore, polyglyceryl-6 caprylate is traded under the name Sunsoft Q-8H-C (manufactured by Taiyo Kagaku Co., Ltd.); polyglyceryl-6 dicaprate is traded under the name Sunsoft Q-102H-C (manufactured by Taiyo Kagaku Co., Ltd.); polyglyceryl-4 lauryl ether is traded under the name SunEther L-4 (manufactured by Taiyo Kagaku Co., Ltd.); sorbitan stearate is traded under the name Sorbon S-60 (manufactured by Toho Chemical Industry Co., Ltd.); isostearyl alcohol is traded under the name Risonol 18SP (manufactured by Higher Alcohol Industry Co., Ltd.); (C15-19) alkane is traded under the name EMOGREEN L-19 (manufactured by SEPPIC SA); and hydrogenated farnesene is traded under the name NEOSSANCE Hemisqualane HF (manufactured by Nikko Chemicals Co., Ltd.); maltitol, mannitol, lactitol, and isomerized sugar were obtained from Bussan Food Science Co., Ltd.; hydrolyzed hydrogenated starch is trade name: Aqua All #1 (manufactured by Bussan Food Science Co., Ltd.); xanthan gum is trade name: Echo Gum (manufactured by CP Kelco US, Inc.); and the acrylic water-soluble polymer is (acrylates / alkyl acrylate (C10-30)) crosspolymer, trade name: Pemulen® TR-1 Polymeric Emulsifier (manufactured by Lubrizol Corporation).

[0095] As can be seen from the results in Tables 1 and 2, cosmetic compositions containing biosurfactant (BS) and water-retaining agents yielded good results in various dosage forms in terms of water retention in the stratum corneum, moisturizing effect on the skin after washing, and odor suppression effect. In contrast, in the comparative examples using polyquaternium and cellulose as humectants, an unpleasant odor was perceived due to the presence of raw material odor, the development of base odor due to heating during the composition manufacturing process, and / or the combination of the unique sweet smell of MEL glycolipids.

Claims

1. A cosmetic composition containing a biosurfactant having a mannose skeleton and a water-retaining agent.

2. The cosmetic composition according to claim 1, wherein the water-retaining agent is a sugar alcohol, a rare sugar, an isomerized sugar, an alkyl glycoside, a sucrose fatty acid ester, or hyaluronic acid or derivatives thereof.

3. The cosmetic composition according to claim 1, wherein the biosurfactant comprises MEL.

4. A cosmetic composition according to any one of claims 1 to 3, which is a detergent composition.

5. The cosmetic composition according to claim 4, which is an oily semi-solid substance.

6. The cosmetic composition according to claim 5, comprising a solid oil, a liquid oil, and a nonionic surfactant.

7. The cosmetic composition according to claim 6, comprising 1 to 30% by mass of solid oil, 50 to 95% by mass of liquid oil, and 3 to 30% by mass of a nonionic surfactant.

Images