Oil-in-water emulsion composition and oil-in-water emulsion cosmetic

Abstract

To provide a creamy oil-in-water emulsion composition with superior stability over time, and oil-in-water emulsion cosmetics.SOLUTION: A creamy oil-in-water emulsion composition comprises (A) two or more of amide bond-containing anionic surfactants that differ in the number of amide bonds, (B) an oil solution in liquid form in an amount of 20-60 mass% relative to the total amount of the composition, (C) a nonionic surfactant with an HLB of 10 or more, and (D) a polyhydric alcohol. Also provided are a method for producing an oil-in-water emulsion composition, and oil-in-water emulsion cosmetics.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a cream-like oil-in-water emulsion composition and a method for producing the same, as well as an oil-in-water emulsion cosmetic using the same. [Background technology]

[0002] As an oil-in-water emulsion composition (e.g., an oil-in-water emulsion cosmetic), an emulsion composition using a liquid oil is known. In an oil-in-water emulsion composition, oil is dispersed in water as an emulsion, and as the amount of oil increases, the ratio of the internal phase increases, the viscosity increases, and the composition becomes creamy. The creamy state can improve the feeling of use, such as a high moisturizing feeling. On the other hand, as the oil content increases and the ratio of the internal phase increases, the dispersion stability is likely to decrease, making it difficult to achieve both the feeling of use and stability.

[0003] As an example of an oil-in-water emulsion cosmetic with a relatively high oil content, Patent Document 1 discloses an oil-in-water emulsion cosmetic containing (A) an aqueous medium, (B) an anionic surfactant, (C) an oil, (D) a specific amphiphilic polymer such as a hydrophobically modified hydrophilic urethane polymer, and (E) a charge neutralizer, with a viscosity of 10,000 mPa·s or more and an oil content of 20% by mass or more. Patent Document 2 also discloses an oil-in-water emulsion cosmetic containing (A) a sucrose fatty acid ester, (B) glycosyl trehalose and hydrogenated starch hydrolysate, (C) a polyhydric alcohol, and (D) 30 to 50% by mass of an oil. However, the above technology requires the blending of a specific polymer such as a hydrophobically modified hydrophilic urethane polymer, and the blending of specific ingredients such as glycosyl trehalose and hydrogenated starch hydrolysate, and in the field of cosmetics where a variety of formulations are required, compositions that do not use these ingredients are also required. In addition, in both of the above documents, when the cosmetic preparation is actually formulated, a polymer that acts as a thickener for stabilization (specifically, the polymer of component (D) in Reference 1 and the carbomer in Reference 2) is blended, and there is a possibility that the thickener may cause a sticky feeling or a sticky feeling on the skin after application. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2021-512848 [Patent Document 2] Patent Publication No. 2021-080194 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention aims to provide an oil-in-water emulsion composition that is creamy and has excellent formulation properties (for example, excellent dispersibility of oils, good stability over time, and good usability such as moisturizing feeling) and an oil-in-water emulsion cosmetic that uses the emulsion composition. [Means for solving the problem]

[0006] The present invention includes, but is not limited to, the embodiments listed below. [1] The following components (A) to (D): (A) two or more amide bond-containing anionic surfactants each having a different number of amide bonds; (B) a liquid oil agent in an amount of 20 to 60% by mass based on the total amount of the composition; (C) a nonionic surfactant having an HLB value of 10 or more, and (D) polyhydric alcohol, 1. A creamy oil-in-water emulsion composition comprising: [2] The oil-in-water emulsion composition according to item [1], having a viscosity of 10,000 mPa s or more. [3] The oil-in-water emulsion composition according to item [1] or [2], wherein at least one of the components (A) is an amino acid-derived surfactant. [4] The oil-in-water emulsion composition according to any one of items [1] to [3], wherein at least one of the components (A) is sodium surfactin. [5] The oil-in-water emulsion composition according to any one of items [1] to [4], wherein the ratio of the content of component (C) to the content of component (A) ((C) / (A)) is 0.1 to 5 in terms of mass ratio. [6] The oil-in-water emulsion composition according to any one of items [1] to [5], wherein the total content of component (A) and component (C) is 6 mass% or less based on the total amount of the composition. [7] The oil-in-water emulsion composition according to any one of items [1] to [6], wherein component (B) is one or more oils selected from the group consisting of non-polar oils and polar oils having a molecular weight of 500 or more. [8] The oil-in-water emulsion composition according to any one of items [1] to [7], wherein component (C) is one or more selected from the group consisting of polyoxyethylene hydrogenated castor oil, fatty acid polyoxyethylene hydrogenated castor oil, polyoxyethylene fatty acid sorbitan, and polyoxyalkylene alkyl ether. [9] The oil-in-water emulsion composition according to any one of items [1] to [8], wherein component (D) is one or more selected from glycerin and 1,3-butylene glycol.

[10] The oil-in-water emulsion composition according to any one of items [1] to [9], wherein the composition comprising components (A) to (D) has emulsion particles emulsified by pressurization at a temperature in the range of 60 to 100°C.

[11] An oil-in-water emulsion cosmetic comprising the oil-in-water emulsion composition according to any one of items [1] to

[10] .

[12] A method for producing the oil-in-water emulsion composition according to any one of items [1] to

[10] , comprising the step of emulsifying a composition containing components (A) to (D) under pressure at a temperature in the range of 60 to 100°C. Effect of the Invention

[0007] According to the present invention, it is possible to provide an oil-in-water emulsion composition which has excellent formulation properties, is typically cream-like, has excellent dispersibility of oily agents, has good stability over time, and provides a good feeling of use, such as a moisturizing feeling, and a cosmetic preparation using the emulsion composition. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The oil-in-water emulsion composition of the present invention comprises the following components (A) to (D): (A) two or more amide bond-containing anionic surfactants each having a different number of amide bonds; (B) a liquid oil agent in an amount of 20 to 60% by mass based on the total amount of the composition; (C) a nonionic surfactant having an HLB value of 10 or more, and (D) polyhydric alcohol, and is cream-like (hereinafter, the oil-in-water emulsion composition of the present invention is also referred to as the composition of the present invention or the present emulsion composition). In this specification, (A) to (D) are label symbols of components, and hereinafter may be referred to as component (A), etc.

[0009] Component (A) Component (A) is an amide bond-containing anionic surfactant. The emulsion composition contains two or more amide bond-containing anionic surfactants having different numbers of amide bonds. By blending two or more amide bond-containing anionic surfactants, a creamy emulsion can be obtained well and the stability over time is improved.

[0010] The amide bond-containing anionic surfactant may be composed of a compound containing one or more (i.e., a plurality) amide bonds (-CO-NR-; R is a hydrogen atom or an organic group such as an alkyl group). The number of amide bonds may be, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11 or more. The combination of anionic surfactants having different numbers of amide bonds may specifically be a combination of an anionic surfactant having one amide bond and an anionic surfactant having multiple amide bonds (e.g., 2, 3, 4, 5, 6, 7, or 8), or a combination of an anionic surfactant having two amide bonds and an anionic surfactant having three or more amide bonds (e.g., 3, 4, 5, 6, 7, or 8). In addition, amide bond-containing anionic surfactants having numbers of amide bonds different from each other, preferably 2 or more, more preferably 3 or more, even more preferably 4 or more, and even more preferably 5 or more, may be combined. Also, for example, an amide bond-containing anionic surfactant having 5 or more amide bonds (e.g., 5 to 8 amide bonds) may be combined with an amide bond-containing anionic surfactant having 4 or less amide bonds (e.g., 2 to 4 amide bonds).

[0011] When two or more kinds of amide bond-containing anionic surfactants are blended, the viscosity and emulsion stability of the cream are significantly improved. This is presumably because amide bond-containing anionic surfactants have high emulsifying power, and further, by using two or more kinds of amide bond-containing anionic surfactants with different numbers of amide bonds, the emulsifying powers complement each other, so that a higher emulsifying power can be obtained overall. Note that the above explanation is merely presumed, and the present invention is not limited thereto.

[0012] As a combination of amide bond-containing anionic surfactants, it is preferable to combine an anionic surfactant having multiple amide bonds with an anionic surfactant having one amide bond, which can efficiently obtain high surface activity, can produce a creamy emulsion, and improve stability over time.

[0013] At least one of the components (A) is preferably an amino acid-based surfactant. This allows a high surface activity to be efficiently obtained, a creamy emulsion to be obtained, and stability over time to be improved. The amino acid-based surfactant has an amide bond derived from an amino acid, and can exhibit excellent surface activity. The amino acid-based surfactant of component (A) may be used in one type, or in two, three, or more types. It is also preferable to use two or more amino acid-based anionic surfactants having different numbers of amide bonds.

[0014] Specific examples of the amide bond-containing anionic surfactant having a plurality of amide bonds include, but are not limited to, sodium surfactin, sodium dilauroyl glutamate lysine, sodium distearoyl glutamate lysine, etc. These are amino acid-based surfactants.

[0015] At least one of the components (A) is preferably sodium surfactin. Sodium surfactin (also written as surfactin Na) is a naturally derived surfactant (biosurfactant) obtained from surfactin, a component contained in natto. Sodium surfactin has a cyclic peptide structure consisting of amino acids and fatty acids, and is obtained by fermentation of Bacillus subtilis. Sodium surfactin has seven amide bonds. Sodium surfactin has high surface activity (said to be 1000 times that of sodium dodecyl sulfate in neutral to weakly basic conditions), low skin irritation, protein denaturation inhibitory effect, and excellent safety.

[0016] Specific examples of amide bond-containing anionic surfactants having one amide bond include, but are not limited to, N-acyl glutamate salts such as sodium stearoyl glutamate as amino acid surfactants, and acyl methyl taurine salts of higher fatty acids such as sodium stearoyl methyl taurine as amide bond-containing anionic surfactants other than amino acid surfactants.

[0017] It is more preferable that component (A) contains sodium surfactin and one or more selected from sodium stearoyl glutamate and sodium stearoyl methyl taurine. This can efficiently improve the surface activity and improve the long-term stability. It is more preferable that component (A) is a combination of sodium surfactin and sodium stearoyl glutamate.

[0018] The content (total amount) of component (A) in the present emulsion composition is not limited to this, but from the viewpoint of obtaining emulsion stability, it is preferably from 0.001 to 8 mass%, more preferably from 0.01 to 6 mass%, and even more preferably from 0.1 to 5 mass%, relative to the total amount (100 mass%) of the present emulsion composition.

[0019] In addition, in component (A), the ratio of the content of the amide bond-containing anionic surfactant having multiple amide bonds (when multiple surfactants are present, the total amount) to the content of the amide bond-containing anionic surfactant having one amide bond (when multiple surfactants are present, the total amount) ((Component A with multiple amide bonds) / (Component A with one amide bond)) is preferably 0.00001 to 1, more preferably 0.0001 to 0.1, in mass ratio. By achieving the above mass ratio, higher emulsifying power can be obtained. In another embodiment, the ratio of the content of the amide bond-containing anionic surfactant having 5 or more amide bonds (the total amount when there are multiple surfactants) to the content of the amide bond-containing anionic surfactant having 4 or less amide bonds (the total amount when there are multiple surfactants) ((Component A having 5 or more amide bonds) / (Component A having 4 or less amide bonds)) in mass ratio is preferably 0.00001 to 1, more preferably 0.0001 to 0.1. In this case too, a higher emulsifying power can be obtained.

[0020] Ingredient (B) Component (B) is a liquid oil. The present emulsion composition contains 20 to 60% by mass of the liquid oil based on the total amount of the composition. By containing the liquid oil in the above amount, it is possible to obtain an emulsion composition having good emulsion stability, a creamy texture, a good moisturizing feeling, and an excellent usability. The liquid oil is liquid at the normal use temperature of the present emulsion composition (specifically, for example, 20°C). For example, the liquid oil may be a liquid oil having a viscosity of 1000 mPa·s or less at 20°C. This viscosity is preferably 800 mPa·s or less, more preferably 600 mPa·s or less. The viscosity can be measured with a B-type viscometer.

[0021] Examples of the oil agent of component (B) include vegetable oils, silicone oils, hydrocarbon oils, ester oils, and the like, and these may be either naturally derived or synthetic.

[0022] The oil agent of component (B) can be roughly divided into polar oils and non-polar oils. Component (B) can have various molecular weights. Among them, component (B) is preferably one or more selected from the group consisting of non-polar oils and polar oils having a molecular weight of 500 or more.

[0023] Specific examples of the oil agent of component (B) include, but are not limited to, silicone oil and hydrocarbon oil as non-polar oil. More specifically, silicone oil includes, for example, dimethicone. Hydrocarbon oil includes, for example, squalane, liquid paraffin (also called mineral oil), isohexadecane, isododecane, hydrogenated polyisobutene, etc. Polar oil with a molecular weight of 500 or more includes vegetable oil (calculated from the molecular weight of the main component in the case of natural products or mixtures), ester oil, modified silicone oil, etc., and specifically, vegetable oil includes, for example, jojoba seed oil, meadowfoam oil, macadamia seed oil, corn oil, hydrogenated coconut oil, olive oil, etc. Ester oil includes, for example, trimethylolpropane triisostearate, diisostearyl malate, etc. Modified silicone oil includes, for example, diphenylsiloxyphenyl trimethicone, diphenyl dimethicone, etc.

[0024] In addition, a polar oil having a molecular weight of less than 500 may be blended as component (B), and examples of the polar oil having a molecular weight of less than 500 include ester oils. Specific examples of the ester oil include cetyl 2-ethylhexanoate, isotridecyl isononanoate, ethyl oleate, di-2-ethylhexyl succinate, and ethylhexyl methoxycinnamate.

[0025] As component (B), jojoba seed oil, meadowfoam oil, macadamia seed oil, corn oil, dimethicone, liquid paraffin, hydrogenated polyisobutene, trimethylolpropane triisostearate, and diisostearyl malate are more preferable. In this case, it is easy to obtain an emulsion composition with a better feeling when used.

[0026] The component (B) blended in the present emulsion composition may be one or more of the above components.

[0027] The content of component (B) (the total amount when there are multiple components) is 20 to 60% by mass with respect to the total amount of the composition (100% by mass), but from the viewpoint of improving emulsion stability and usability such as moisturizing properties, the content of component (B) is more preferably 25 to 55% by mass, and even more preferably 30 to 50% by mass with respect to the total amount of the composition. In addition, when component (B) contains a non-polar oil and a polar oil having a molecular weight of 500 or more, the content of the non-polar oil and the polar oil having a molecular weight of 500 or more (the total amount when there are multiple components) is preferably 20 to 60% by mass, more preferably 25 to 55% by mass, and even more preferably 30 to 50% by mass with respect to the total amount of the composition. Furthermore, the amount of non-polar oils and polar oils having a molecular weight of 500 or more relative to the total amount of component (B) (the total amount if there are multiple oils) is preferably 50 to 100 mass%, more preferably 60 to 100 mass%, and even more preferably 70 to 100 mass%, when the total amount of component (B) is 100 mass%.

[0028] Ingredients (C) Component (C) is a nonionic surfactant with an HLB of 10 or more. By blending a nonionic surfactant with an HLB of 10 or more, the surfactant ability of component (A) is supplemented, emulsification is promoted, and viscosity is improved, making it possible to obtain a stable creamy composition.

[0029] The component (C) is preferably at least one selected from the group consisting of polyoxyethylene hydrogenated castor oil, fatty acid polyoxyethylene hydrogenated castor oil, polyoxyethylene fatty acid sorbitan, and polyoxyalkylene alkyl ether. By blending these components, the stability of the present emulsion composition can be further improved.

[0030] Polyoxyethylene hydrogenated castor oils exist with different average molar numbers of ethylene oxide added (represented by "EO"), but any suitable one can be used as long as it has an HLB of 10 or more, and for example, one with an EO of 5 to 100 can be used, preferably one with an EO of 10 to 60, and more preferably one with an EO of 10 to 40. Specific examples of polyoxyethylene hydrogenated castor oil that can be used include polyoxyethylene (EO20) hydrogenated castor oil, polyoxyethylene (EO30) hydrogenated castor oil, and polyoxyethylene (EO40) hydrogenated castor oil.

[0031] The fatty acid polyoxyethylene hydrogenated castor oil is an ester compound of polyoxyethylene hydrogenated castor oil and fatty acid. The acyl group derived from the fatty acid may be linear or branched, and the number of carbon atoms is preferably 8 to 24, more preferably 9 to 22, and even more preferably 10 to 20. The acyl group may be saturated or unsaturated. There are fatty acid polyoxyethylene hydrogenated castor oils with different average molar numbers of ethylene oxide added (represented by "EO"), and any suitable one can be used as long as it has an HLB of 10 or more, for example, one with an EO of 5 to 100 can be used, preferably one with an EO of 10 to 70, and more preferably one with an EO of 20 to 60. Examples of fatty acid polyoxyethylene hydrogenated castor oils include polyoxyethylene isostearate (50EO) hydrogenated castor oil.

[0032] Polyoxyethylene fatty acid sorbitan is also called polyoxyethylene sorbitan fatty acid ester. The acyl group derived from the fatty acid may be linear or branched, and the number of carbon atoms is preferably 8 to 24, more preferably 9 to 22, and even more preferably 10 to 20. The acyl group may be saturated or unsaturated. Polyoxyethylene fatty acid sorbitan exists with different average number of moles of ethylene oxide added (represented by "EO"), and any suitable one can be used as long as it has an HLB of 10 or more. For example, one with an EO of 5 to 100 can be used, preferably one with an EO of 10 to 60, and more preferably one with an EO of 20 to 40.

[0033] Examples of polyoxyethylene fatty acid sorbitan include polyoxyethylene sorbitan monooleate (also known as polysorbate 80), polyoxyethylene coconut oil fatty acid sorbitan, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate (also known as polysorbate 60), polyoxyethylene sorbitan trioleate, etc., with polyoxyethylene sorbitan monooleate being preferred. These may have an EO of 20, for example.

[0034] The polyoxyalkylene alkyl ether means an ether compound in which a polyoxyalkylene group and an alkyl group are bonded via an oxygen atom (O). Examples of the polyoxyalkylene group include a polyoxyethylene group, a polyoxypropylene group, and a group containing both. The polyoxyalkylene alkyl ether is more preferably a polyoxyethylene polyoxypropylene alkyl ether (containing both a polyoxyethylene group and a polyoxypropylene group). The alkyl group forming an ether with the polyoxyalkylene group may be linear or branched. The alkyl group preferably has 8 to 30 carbon atoms, more preferably 9 to 28 carbon atoms, and even more preferably 10 to 26 carbon atoms. The alkyl group may be saturated or unsaturated, but is more preferably saturated. The polyoxyalkylene alkyl ether is preferably one in which the polyoxyalkylene portion contains at least one of a polyoxyethylene group and a polyoxypropylene group, and the alkyl group has 8 to 30 carbon atoms. The polyoxyalkylene alkyl ether may be, for example, an ether compound formed from a higher alcohol and an alkylene oxide.

[0035] As the polyoxyalkylene alkyl ether, any suitable one can be used as long as it has an HLB of 10 or more, and specifically, for example, polyoxyethylene polyoxypropylene decyl tetradecyl ether, polyoxyethylene polyoxypropylene cetyl ether, polyoxyethylene polyoxypropylene decyl ether, polyoxyethylene polyoxypropylene butyl ether, polyoxyethylene behenyl ether, etc. are preferred. As component (C), polyoxyalkylene alkyl ether is more preferred than polyoxyethylene hydrogenated castor oil, fatty acid polyoxyethylene hydrogenated castor oil, and polyoxyethylene fatty acid sorbitan. That is, in one embodiment, component (C) is preferably polyoxyalkylene alkyl ether.

[0036] The component (C) blended in the present emulsion composition may be one or more of the above components.

[0037] The content of component (C) (the total amount when multiple components are present) is not limited to the above, but from the viewpoint of obtaining a creamy viscosity and emulsion stability, it is preferably 0.01 to 10 mass %, more preferably 0.1 to 5 mass %, and even more preferably 0.5 to 3 mass %, relative to the total amount (100 mass %) of the emulsion composition.

[0038] Here, the ratio of the content of component (C) to the content of component (A) ((C) / (A)) is preferably, in mass ratio, from 0.1 to 5, and more preferably, this ratio ((C) / (A)) is, in mass ratio, from 0.3 to 3. When the ratio of the content of component (C) to the content of component (A) falls within the above range, excellent stability is obtained and it becomes easier to obtain an emulsion composition having excellent usability.

[0039] In addition, the total content of component (A) and component (C) is preferably 6% by mass or less based on the total amount of the composition (100% by mass). When the content of component (A) and component (C) is reduced, excellent stability is obtained and it becomes easier to obtain an emulsion composition with excellent usability. The total content of component (A) and component (C) is preferably 5.5% by mass or less, more preferably 5% by mass or less. The lower limit of the total content of component (A) and component (C) is not particularly limited, but for example, the total content can be 0.01% by mass or more, preferably 0.1% by mass or more.

[0040] Ingredients (D) Component (D) is a polyhydric alcohol. A polyhydric alcohol is an alcohol having two or more hydroxyl groups (OH) in the molecule. The incorporation of a polyhydric alcohol provides a creamy viscosity, improves stability, and provides a fresher feeling when used. The polyhydric alcohol is preferably a dihydric to hexahydric polyhydric alcohol. The polyhydric alcohol is preferably a liquid polyhydric alcohol. The liquid state of the polyhydric alcohol means that the polyhydric alcohol is liquid at the temperature (e.g., 20°C) when the emulsion composition is used. Examples of polyhydric alcohols include, but are not limited to, glycerin, diglycerin, 1,3-butylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, and ethylhexylglycerin. Component (D) may be one type of polyhydric alcohol, or two or more types may be used in combination. Component (D) is more preferably one or more types selected from glycerin and 1,3-butylene glycol. In that case, stability is further improved.

[0041] The content of component (D) (the total amount when there are multiple components) is not limited to this, but from the viewpoint of obtaining an emulsion composition that is stable and has a good feel when used, it can be 1 to 50 mass % relative to the total amount of the emulsion composition (100 mass %), preferably 5 to 40 mass %, and more preferably 10 to 30 mass %.

[0042] Other ingredients: Water The emulsion composition may contain water. In the oil-in-water emulsion composition, the emulsion form is oil-in-water (O / W), the aqueous phase is the external phase, and the oil phase is the internal phase. The aqueous phase may contain water-soluble substances and hydrophilic substances. The water is not limited to this, but purified water is preferably used.

[0043] The water content in the present oil-in-water emulsion composition is not limited to this value, but can be 1 to 70 mass %, preferably 5 to 60 mass %, and more preferably 10 to 50 mass %.

[0044] Other Ingredients The emulsion composition may contain various components that can be incorporated into an oil-in-water emulsion composition or an oil-in-water emulsion cosmetic. Examples of such components include non-liquid oils, nonionic surfactants with an HLB value of less than 10, cationic surfactants, amphoteric surfactants, anionic surfactants other than component (A), monohydric alcohols, moisturizers, thickeners, polymers, pigments, film-forming agents, pH adjusters, anti-fading agents, antioxidants, defoamers, powders, cosmetic ingredients, plant extracts, preservatives, and fragrances.

[0045] Examples of non-liquid oils include semi-solid or solid oils. Here, the properties of the oil (semi-solid or solid) are those at 20°C. Examples of semi-solid oils include, but are not limited to, petrolatum, hydrogenated palm oil, hydrogenated castor oil stearate, cholesteryl hydroxystearate, polyhydroxystearic acid, and hydrogenated polyisobutene (paste-like at 20°C). Examples of solid oils include, but are not limited to, glyceryl stearate, candelilla wax, beeswax, shea butter, behenyl alcohol, cetostearyl alcohol, batyl alcohol, stearic acid, and palmitic acid. These may be used alone or in combination of two or more. From the viewpoint of usability, the present emulsion composition may not contain a solid oil, and may not contain both a semi-solid oil and a solid oil.

[0046] Examples of nonionic surfactants with an HLB of less than 10 include sorbitan fatty acid esters such as sorbitan sesquioleate, sucrose fatty acid esters, etc. Examples of cationic surfactants include quaternary ammonium salts such as behenyl PG trimonium chloride and lauryl trimethylammonium chloride, and amidoamine compounds such as behenic acid dimethylaminopropylamide, etc. Examples of amphoteric surfactants include phospholipids (e.g., hydrogenated soybean phospholipids, lecithin, hydrogenated lecithin, etc.), phospholipid analogs (e.g., behendimonium ethyl stearyl phosphate, etc.), alkyl betaine amphoteric surfactants such as lauryl dimethyl betaine, amidopropyl betaine amphoteric surfactants such as oleic acid amidopropyl betaine, and amino acid amphoteric surfactants such as sodium lauryl aminopropionate, etc. Examples of anionic surfactants other than component (A) include acyl lactate salts such as sodium stearoyl lactate, fatty acid soaps such as sodium laurate, higher alkyl sulfate salts such as sodium lauryl sulfate, alkyl ether sulfate salts such as POE-triethanolamine lauryl sulfate, and phosphate salts such as sodium POE-oleyl ether phosphate.

[0047] Here, in the present emulsion composition, the total content of surfactants is preferably 6% by mass or less relative to the total amount of the composition (100% by mass). When the total content of surfactants is reduced, the proportion of surfactants in the total amount can be reduced, and it becomes easier to obtain an emulsion composition with reduced stickiness and excellent usability. The total content of surfactants means the total amount of all surfactants including component (A), component (C), and any other surfactants. The total content of surfactants is preferably 5.5% by mass or less, and more preferably 5% by mass or less. The lower limit of the total content of surfactants is not particularly limited, but for example, the total content can be 0.01% or more, preferably 0.1% or more, more preferably 0.2% or more, and even more preferably 0.5% or more.

[0048] Examples of monohydric alcohols include, but are not limited to, ethanol and propanol.

[0049] The present emulsion composition may contain a preservative, including, but not limited to, methyl paraoxybenzoate (also known as methylparaben), phenoxyethanol, and the like.

[0050] The present emulsion composition is in the form of a cream. By being in the form of a cream, a composition having excellent moisturizing properties and a good feeling when used can be obtained. In this specification, the term "cream" means an emulsified viscous body in which oil and water are uniformly mixed, and includes a highly viscous liquid and a semi-solid.

[0051] The viscosity of the present emulsion composition is preferably 10,000 mPa·s or more. This allows a creamy emulsion composition to be obtained more stably. The viscosity is at a temperature at which cosmetics are normally used, for example, at 20°C. The viscosity can be measured with a B-type viscometer. As the B-type viscometer, for example, a VISCOMETER TVB-10 manufactured by Toki Sangyo Co., Ltd. (measurement temperature: 20°C, measurement conditions: rotor number No. 2 to 4, rotation speed 0.3 to 6.0 rpm, measurement time 1 to 3 minutes) can be used. From the viewpoint of obtaining a stable composition, the viscosity is more preferably 20,000 mPa·s or more, and even more preferably 30,000 mPa·s or more. The upper limit of the viscosity is a measurement limit value and does not need to be set, but can be, for example, 100,000 mPa·s or less.

[0052] In the present emulsion composition, the viscosity of the composition is preferably one that maintains its value not only immediately after production but also over time. In other words, it is preferable that there is no or only a small decrease in viscosity. Specifically, in the present emulsion composition, the viscosity after standing at 40°C for one month is preferably 10,000 mPa·s or more, more preferably 20,000 mPa·s or more, and even more preferably 30,000 mPa·s or more.

[0053] The present emulsion composition is emulsified and has emulsion particles. In order for the present emulsion composition to have stable emulsion particles, it is advantageous for the emulsion particles to be small. From this viewpoint, the particle size of the emulsion particles is preferably 200 nm or less, more preferably 180 nm or less, and even more preferably 150 nm or less. The lower limit of the particle size of the emulsion particles is not particularly limited, but may be, for example, 10 nm or more. The particle size of the emulsion particles (emulsion particle size) can be determined, for example, by measuring the light scattering intensity at 25°C using a laser zeta electrometer and performing cumulant analysis. When the viscosity is high and the measurement is difficult, the composition may be diluted with water or the like to make it measurable while preventing the emulsion particles from collapsing.

[0054] The present emulsion composition preferably has emulsion particles emulsified by pressurizing a composition containing components (A) to (D) at a temperature in the range of 60 to 100°C. Emulsion particles emulsified under pressure tend to be stabilized, for example, by having a smaller particle size. In addition, a uniform cream-like composition is easily obtained by reducing the particle size of the emulsion. Emulsification processed under pressure is called high-pressure emulsification. Here, it has been confirmed that the particle size of the emulsion is reduced by high-pressure emulsification. For example, the emulsion particle size may be 1 μm (1000 nm) or more when not treated with high pressure, but may be 200 nm or less when treated with high pressure. In the present emulsion composition, it is presumed that there is a certain degree of correlation between the viscosity of the composition and the particle size, and in a cream-like composition, the emulsion particle size is often in the range of about 200 nm or less. The upper limit of the emulsion particle size is not limited to this, but is preferably 500 nm. High-pressure emulsification (pressurized emulsification) and further high-pressure heated emulsification will be described in the production method below, and all descriptions in the explanation of the production method are incorporated by reference as explanations of the emulsion composition.

[0055] The present emulsion composition can be produced by mixing the above-mentioned components. For example, a method can be used in which an aqueous component that has been heated and mixed in advance and an oil component that has been heated and mixed in advance are mixed and emulsified, and then cooled, in the same manner as in the production of a normal emulsion composition. Alternatively, the above-mentioned components may simply be heated and mixed, and then cooled. In the production, an appropriate emulsifier or kneader (e.g., a three-roller, homomixer, etc.) can be used. Of course, the method for producing the present emulsion composition is not limited to this.

[0056] Here, it has been confirmed that in the present emulsion composition, a uniform cream-like emulsion composition may not be obtained by simply mixing the above-mentioned components. This is believed to be because the composition contains a relatively large amount of oil. Therefore, it is preferable to carry out high-pressure emulsification. The high-pressure emulsification makes it easier to obtain a cream-like composition. However, if a cream-like composition can be obtained by mixing the above-mentioned components, high-pressure emulsification may not be necessary.

[0057] In one aspect, the present invention relates to a method for producing an oil-in-water emulsion composition, comprising a step of emulsifying a composition containing components (A) to (D) by pressurizing it at a temperature in the range of 60 to 100° C. As a result, as described above, the emulsion composition can have emulsion particles obtained by emulsifying a composition containing components (A) to (D) by pressurizing it at a temperature in the range of 60 to 100° C. As a result, it is possible to obtain an emulsion cosmetic that has a significantly improved emulsion stability, a fresh feel in use, little stickiness on the skin after use, and excellent moisturizing feel.

[0058] In the production of the present emulsion composition, for example, the components (A) to (D) are heated and mixed to prepare a composition (primary composition), and the composition is heated and subjected to high pressure treatment to form the emulsion composition. As a result, a uniform, creamy, stable emulsion composition can be obtained. Preferably, the heated composition is subjected to high pressure treatment, and then cooled while stirring, so that emulsification proceeds to obtain the emulsion composition. The cooling temperature is preferably room temperature (e.g., 20°C) or lower, more preferably 15°C or lower. By cooling, the emulsion particles are stabilized, and a more stable emulsion can be obtained. Here, when shearing is performed in the high pressure treatment, the temperature of the emulsion composition is likely to increase after operation in devices that utilize shear energy, from stirring to high pressure treatment. Therefore, it is preferable to adopt a cooling process using a cooling device such as a heat exchanger, or natural cooling.

[0059] Specifically, the primary composition is obtained by, for example, mixing the components (A) to (D) and other appropriate components with water and heating to prepare a solution. The heating temperature can be, for example, 60 to 100°C, preferably 65 to 95°C, and more preferably 70 to 90°C. At this time, the water-soluble component and the oil-soluble component are mixed, and if they are in a heated state in the presence of a surfactant, a uniform solution is easily formed. After preparing the primary composition, the primary composition may be cooled, or may proceed directly to the next step (pressurization). For example, if the primary composition is maintained in a heated state to some extent while proceeding to the pressurization step, the heating and high pressure treatment can be performed efficiently.

[0060] Then, the primary composition is treated under high pressure and heating. The components in the composition are more dispersed by the high pressure treatment, and a uniform emulsion composition is more easily obtained. The pressure of the high pressure treatment is not limited to this, but can be, for example, 50 to 250 MPa, preferably 60 to 200 MPa, and more preferably 65 to 150 MPa. When the emulsion composition is treated under high pressure and heating, the temperature can be in the range of 60 to 100°C, and specifically, although not limited to this, for example, it is preferably 60 to 90°C, more preferably 65 to 90°C, and even more preferably 70 to 85°C. Furthermore, the temperature and pressure conditions in the high pressure and heating treatment are, for example, preferably 60 to 90°C, 50 to 250 MPa, and more preferably 65 to 90°C, and 50 to 150 MPa. As an apparatus for performing high pressure treatment, for example, a high pressure homogenizer (high pressure emulsification apparatus) can be used. The high-pressure homogenizer may be a pressure homogenizer. For example, the mechanism is not limited to this, but the fluid (composition) may be pressurized and passed through a homogenizing valve, whereby the particles are blown out from a fine gap and collide with each other or with an impact ring, or the like, and the shear force caused by the pressure difference may be used to homogenize the composition. The treatment with the high-pressure homogenizer may be performed, for example, in a continuous manner, rather than in a batch manner. By passing the composition through the high-pressure homogenizer, for example, the particle size of the particles, such as emulsion particles, may be reduced, or the components in the composition may be further dispersed or dissolved. Such a heating and high-pressure treatment may make it easier to obtain a creamy emulsion composition with excellent emulsion stability.

[0061] The composition emulsified by the above-mentioned high pressure treatment has finer emulsion particles than the composition before the high pressure treatment, and therefore a uniform, creamy emulsion composition that is stable over time can be obtained.

[0062] The emulsion composition obtained above can be used as an emulsion cosmetic as it is, or can be used to obtain a final emulsion cosmetic by adding appropriate ingredients. The emulsion composition is stabilized, and the emulsion is unlikely to collapse even if appropriate ingredients are added. The emulsion composition can also maintain a creamy form even if other ingredients are added. The emulsion particles present in the emulsion composition can continue to exist in the final emulsion cosmetic. When ingredients are added to the emulsion composition, it is preferable to add them at room temperature (e.g., 20°C) or lower from the viewpoint of stability.

[0063] The present invention relates to an oil-in-water emulsion cosmetic (hereinafter referred to as "the present emulsion cosmetic"). The present emulsion cosmetic contains the present emulsion composition. This can provide a stable oil-in-water emulsion cosmetic that is comfortable to use. The present emulsion composition can provide a cosmetic that maintains viscosity, has excellent emulsion stability, provides a fresh feel when used, is less sticky on the skin after use, and has excellent moisturizing properties and a comfortable feel when used. The present emulsion cosmetic can contain the ingredients of the present emulsion composition described above. The contents of each ingredient and their content ratios may be the same as those described for the present emulsion composition. The present emulsion cosmetic is preferably in the form of a cream.

[0064] In addition to the present emulsion composition, the present emulsion cosmetic may contain various raw materials that can be used as raw materials for cosmetics. Examples of raw materials include oils, surfactants (nonionic surfactants, cationic surfactants, amphoteric surfactants, anionic surfactants), monohydric or polyhydric alcohols, powders, moisturizers, thickeners, polymers, pigments, film-forming agents, pH adjusters, anti-fading agents, antioxidants, defoamers, powders, cosmetic ingredients, plant extracts, preservatives, and fragrances. For example, the present emulsion cosmetic may contain powders, and examples of the powders include inorganic powders such as mica, talc, silica, titanium oxide, and zinc oxide, and organic powders such as nylon and polyethylene. For example, the present emulsion cosmetic may contain oils such as solid oils and semi-solid oils. The present emulsion cosmetic may also be obtained by mixing the above-mentioned emulsion composition with another emulsion composition. The present emulsion cosmetic may be in a non-creamy form due to the addition of additional ingredients. However, even if the present emulsion cosmetic is not in a cream form, by forming it by including the present cream-like emulsion composition described above, it is possible to obtain an emulsion cosmetic that has a small emulsion particle size, has a good feel when used, and is stable over time.

[0065] The present emulsion cosmetic may be a skin cosmetic or a hair cosmetic. The present emulsion cosmetic is particularly preferably a skin cosmetic (oil-in-water emulsion cosmetic for skin). The present emulsion cosmetic can be used as an emulsion cosmetic for any purpose, including skin care products and makeup products.

[0066] The skin cosmetic is not particularly limited as long as it is in the form of an oil-in-water emulsion, and can be used as a cosmetic for various purposes. For example, it can be a lotion, a beauty essence, a milky lotion, a cream, a hand cream, an eye cream, a body cream, a makeup cosmetic, an eye shadow (eye color), a makeup base, a gel, a cleanser, a sunscreen, etc. Methods for using the skin cosmetic include applying it to hands or fingers, applying it to cotton, impregnating it into nonwoven fabric, spraying it with a spray or mist, etc.

[0067] The hair cosmetic is not particularly limited as long as it is in the form of an oil-in-water emulsion, and can be used as a cosmetic for various purposes. For example, it can be a hair cream, a hair wax, a hair rinse, a hair mask, a hair treatment, a sunscreen for hair, a shampoo, a conditioner, and the like. The method of using the hair cosmetic can be a method of applying it to hands or fingers, a method of spraying it with a spray or mist, and the like.

[0068] By incorporating the present emulsion composition, the present emulsion cosmetic maintains its viscosity, has excellent emulsion stability, provides a fresh feel when used, leaves the skin less sticky after application, and provides excellent moisturizing properties and a pleasant feel when used. EXAMPLES

[0069] The oil-in-water emulsion composition according to the present invention will be described below with reference to examples, but the present invention is not limited to these examples.

[0070] Examples 1 to 14, Comparative Examples 1 to 9 Tables 1 and 2 show the components of the emulsion cosmetics (specifically, creams) of Examples 1 to 14 and Comparative Examples 1 to 9, as well as the amounts (mass %) of the components, emulsion stability, usability, and other evaluation results.

[0071] [Table 1]

[0072] [Table 2]

[0073] Special notes about ingredients in the table *1: Silicone KF-96A (6CS) (Shin-Etsu Chemical Co., Ltd.) *2: Drecole 600 (Kaneda Co., Ltd.)

[0074] Regarding component (C), the HLB of polyoxyethylene polyoxypropylene decyl tetradecyl ether is 11.0, the HLB of polyoxyethylene (20EO) hydrogenated castor oil is 10.5, the HLB of polyoxyethylene hydrogenated castor oil isostearate is 12.0, and the HLB of polyoxyethylene sorbitan monooleate (20E.O.) is 15.7.

[0075] The examples and comparative examples shown in Tables 1 and 2 were produced by the following methods. Manufacturing Methods of Examples 1 to 14 A. The components (A), (B), (C), and (D) were dissolved in water at 80° C. to obtain a composition. B. The above composition was treated with a high-pressure emulsifier (high-pressure homogenizer). At that time, the temperature just before pressurization was set to 70°C, and emulsification was performed by treating at the set temperature under a pressure of 70 MPa. C. After the pressure treatment, the mixture was cooled to a temperature of 15° C. or lower to obtain the emulsion cosmetic of each example.

[0076] Manufacturing methods of Comparative Examples 1 to 9 In Comparative Example 1, an emulsified cosmetic preparation was obtained by producing in the same manner as in Example 1, except that component (A) was not blended (the same amount was replaced with purified water). In Comparative Example 2, an emulsified cosmetic was obtained by producing in the same manner as in Example 1, except that one type of component (A) was used (the amount of the reduced amount was replaced with purified water). In Comparative Example 3, an emulsified cosmetic preparation was obtained in the same manner as in Example 1, except that component (B) was not blended (the same amount was replaced with purified water). In Comparative Example 4, an emulsion cosmetic was obtained in the same manner as in Example 1, except that petrolatum was used instead of component (B). In Comparative Example 5, an emulsified cosmetic preparation was obtained in the same manner as in Example 1, except that component (C) was not blended (the same amount was replaced with purified water). In Comparative Example 6, an emulsion cosmetic was obtained in the same manner as in Example 1, except that sorbitan sesquioleate (a nonionic surfactant with an HLB value of 4) was used instead of component (C). In Comparative Example 7, an emulsified cosmetic preparation was obtained in the same manner as in Example 1, except that component (D) was not blended (the same amount was replaced with purified water). In Comparative Example 8, an emulsion cosmetic was obtained by production in the same manner as in Example 1, except that in the pressurized emulsification treatment in the high-pressure emulsifier, the temperature immediately before pressurization was set to 25° C. The emulsion cosmetic of Comparative Example 8 was not cream-like (a low-viscosity cloudy liquid was obtained). In Comparative Example 9, an emulsion cosmetic was obtained by production in the same manner as in Example 1, except that the pressurized emulsification treatment using the high-pressure emulsification device was not performed. Note that the emulsion cosmetic of Comparative Example 9 was not cream-like (a low-viscosity cloudy liquid was obtained).

[0077] evaluation The emulsion cosmetics of Examples 1 to 14 and Comparative Examples 1 to 9 shown in Tables 1 and 2 were evaluated by the following methods.

[0078] viscosity Each sample of the Examples and Comparative Examples was filled into a glass bottle, sealed, and stored at room temperature for one week and one month after production. The viscosity (mPa s) was measured using a B-type viscometer (Toki Sangyo VISCOMETER TVB-10, measurement temperature: 20°C, measurement conditions: rotor numbers 2 to 4, rotation speed 0.3 to 6.0 rpm, measurement time 1 to 3 minutes) (1W viscosity and 1M viscosity, respectively). ◎:30,000mPa·s or more ○: 10,000 mPa s or more and less than 30,000 mPa s ×: Less than 10,000 mPa s

[0079] Emulsion stability Each sample of the Examples and Comparative Examples was filled into a glass bottle, sealed, and stored for one month in a thermostatic chamber at 40° C. After storage, the samples were visually observed for changes in appearance, based on the state immediately after production, and rated according to the following criteria. ◎: No separation ○: Slight separation, but disappears when mixed △: Slight separation occurs, but does not disappear even when mixed. ×: Significant separation In addition, for those in which a creamy composition was not obtained, the emulsion stability was not evaluated (marked with "-" in the table).

[0080] Usability (fresh feeling, no stickiness on skin after application, moisturizing effect) A panel of 20 experts conducted a sensory evaluation of the feel of each sample from the Examples and Comparative Examples by using the cosmetics on the forearm. Specifically, the cosmetics were applied to the forearm, and the results of a questionnaire (select one of good, normal, slightly bad, or bad) were used to evaluate the three items (fresh feel of use, non-stickiness of skin after application, and moisturizing feel) according to the following criteria. ◎: 15 or more out of 20 people answered "good" ○: 10 to 14 out of 20 people answered that it was good △: 5 to 9 out of 20 people answered "good" ×: 0 to 4 out of 20 people answered "good"

[0081] result Examples 1 to 14, which contain components (A) to (D), had good stability and good usability (fresh usability, non-sticky skin after use, moisturizing feel). On the other hand, Comparative Examples 1 to 9 had poor viscosity results, and good preparations were not obtained. In particular, the results of Comparative Example 2 suggested that it is advantageous to blend two or more types of anionic surfactants as component (A). Furthermore, the results of Comparative Examples 8 and 9 suggested that even if components (A) to (D) are blended, it may not be possible to obtain a cream-like emulsion cosmetic, and that the dispersibility of emulsion particles is important. In addition, when the particle diameters of the emulsions of Example 1, Comparative Example 8, and Comparative Example 9 were measured and compared, the particle diameter of Example 1 was 200 nm or less, while the particle diameters of Comparative Examples 8 and 9 were 1 μm (1000 nm) or more.

[0082] Example (Formulation Example) The following examples were produced as oil-in-water emulsion cosmetics. In the following examples, the content refers to the blending ratio (% by mass), and the "remaining amount" refers to the amount that makes the total amount 100% by mass. All viscosities were measured at 20°C. The viscosity was measured with a B-type viscometer (Toki Sangyo VISCOMETER TVB-10, measurement temperature: 20°C, measurement conditions: rotor number No. 2 to 4, rotation speed 0.3 to 6.0 rpm, measurement time 1 to 3 minutes).

[0083] Formulation example 1: Oil-in-water serum (Ingredients) (Content) 1. Sodium surfactin (ingredient A) 0.04% 2. Sodium stearoyl glutamate (ingredient A) 0.8% 3. Sodium stearoyl methyl taurate (ingredient A) 0.1% 4. Dimethicone (viscosity 6cs) (ingredient B) 25.0% 5. Meadowfoam oil (ingredient B) 5.0% 6. Polyoxyethylene polyoxypropylene decyl tetradecyl ether (Component C) 2.0% 7. Glycerin (ingredient D) 10.0% 8. 1,3-Butylene glycol (ingredient D) 10.0% 9. Remaining purified water 10. EDTA-2Na 0.1% 11. L-Ascorbic acid 2-glucoside 2.0% 12. Phenoxyethanol 0.2% 13. Ethylhexylglycerin (*1) 0.1% 14. Jasmine flower extract, edelweiss extract, mallow extract, vitamin E acetate, theanine, organic peppermint extract mixture (beauty ingredient mixture) 1.0% 15. Ethanol 2.0% 16.Fragrance 0.1% (*1) ADEKA NOL GE-RF (manufactured by ADEKA Chemical Supply Co., Ltd.)

[0084] (Manufacturing method) A. Composition 1 was obtained by dissolving components 1 to 8 and 30.0% of component 9 (of the total amount in the formulation example) at 80°C under heating. B. The above composition 1 was treated in a high-pressure emulsifier. At that time, the temperature immediately before pressurization was set to 60° C. to 100° C., and emulsification was performed by treating at the set temperature under a pressure of 70 MPa to 100 MPa. C. After the pressure treatment, the above mixture was cooled to a temperature of 15° C. or lower to obtain emulsion composition 2. D. The remainder of component 9 and components 10 to 16 were mixed into the above emulsion composition 2. E. The above mixture was degassed to obtain an oil-in-water type cosmetic serum.

[0085] In Formulation Example 1, when the above emulsion composition 2 was taken as the total amount (100%), the content of component (B) was 36.17%, (C) / (A)=2.13 (mass ratio), and (A)+(C)=3.54%. Emulsion composition 2 was creamy and had a viscosity of 10,000 mPa s or more.

[0086] Formulation example 2: Oil-in-water emulsion (Ingredients) (Content) 1. Sodium surfactin (ingredient A) 0.05% 2. Sodium stearoyl methyl taurate (ingredient A) 0.7% 3. Diisostearyl malate (ingredient B) 10.0% 4. Macadamia seed oil (ingredient B) 20.0% 5. Polyoxyethylene (20EO) hydrogenated castor oil (ingredient C) 2.1% 6. Glycerin (ingredient D) 10.0% 7. 1,3-Butylene glycol (ingredient D) 10.0% 8. Remaining purified water 9. EDTA-2Na 0.1% 10. Sodium phosphate 0.1% 11. Disodium Phosphate 0.1% 12. Carbomer 0.02% 13. Sodium hydroxide 0.06% 14. Tranexamic acid 2.0% 15. Nicotinamide 5.0% 16. Phenoxyethanol 0.3% 17. Mixture of jasmine flower extract, grape leaf extract, peppermint leaf extract, bifidobacterium culture lysate, cherry blossom extract, polyquaternium-51, rose multiflora fruit extract, rosehip flower extract, rosa robur extract, tocopherol acetate, water-soluble collagen, royal jelly extract, angelica root extract, rosa centifolia flower extract, rosa damask flower water, rosemary leaf extract, acerola fruit extract, acetyl glutamic acid, theanine, glycine, hydrolyzed hyaluronic acid, and sodium hyaluronate (mixture of beauty ingredients) 1.0% 18. Ethanol 1.0% 19. L-Menthol 0.1% 20. Caramel 0.02% 21.Fragrance 0.2%

[0087] (Manufacturing method) A. Composition 1 was obtained by dissolving 30.0% (of the total amount in the formulation example) of components 1 to 7 and component 8 at 80°C under heating. B. The above composition 1 was treated in a high-pressure emulsifier. At that time, the temperature immediately before pressurization was set to 60° C. to 100° C., and emulsification was performed by treating at the set temperature under a pressure of 70 MPa to 100 MPa. C. After the pressure treatment, the above mixture was cooled to a temperature of 15° C. or lower to obtain emulsion composition 2. D. Components 12 and 13 and a portion of component 8 were heated to 80°C and mixed to obtain mixture 1. E. Mixture 1, ingredients 9 to 11, 14 to 21, and the remainder of ingredient 8 were mixed into emulsion composition 2 at room temperature. F. The above mixture was defoamed to obtain an oil-in-water emulsion.

[0088] In Formulation Example 2, when the above emulsion composition 2 was taken as the total amount (100%), the content of component (B) was 36.21%, (C) / (A)=2.80 (mass ratio), and (A)+(C)=3.44%. Emulsion composition 2 was creamy and had a viscosity of 10,000 mPa s or more.

[0089] Formulation example 3: Oil-in-water cream 1 (Ingredients) (Content) 1. Sodium surfactin (ingredient A) 0.06% 2. Sodium stearoyl glutamate (ingredient A) 1.0% 3. Trimethylolpropane triisostearate (ingredient B) 15.0% 4. Liquid paraffin (ingredient B) (*2) 15.0% 5. Corn oil (ingredient B) 5.0% 6. Polyoxyethylene isostearate (50EO) hydrogenated castor oil (ingredient C) 2.4% 7. Glycerin (ingredient D) 15.0% 8. 1,3-Butylene glycol (ingredient D) 10.0% 9. Remaining purified water 10. Xanthan gum 0.02% 11. (Acrylates / C10-30 alkyl acrylate) crosspolymer 0.02% 12. Sodium hydroxide 0.06% 13. Mixture of hydrolyzed conchiolin solution, gentian extract, hydrolyzed silk solution, hydrolyzed rice extract, seaweed extract, L-serine, Iwashobu leaf extract, Artemisia capillaris flower extract, Alpinia speciosa leaf extract, Saccharomyces cerevisiae extract, Pomegranate fruit extract, Pomegranate peel extract, Thamnoides fruit extract, Eggplant fruit extract, Harpagophytum root extract, Parsley extract, Royal jelly extract, Rosa alba flower extract, Avocado extract, Gynostemma pentaphyllum extract, Chamomilla recutita water, Berry fruit extract, Apple extract, Lemongrass extract, Hitoyoshi extract, Asparagus extract, Artemia extract, Guava extract, Coffee extract, Taiso extract, Grape leaf extract, and Sanguinea oleracea extract (mixture of beauty ingredients) 1.0% 14. Phenoxyethanol 0.3% 15. Ethanol 1.0% 16.Fragrance 0.2% (*2) Hicall K-350 (Kaneda)

[0090] (Manufacturing method) A. Composition 1 was obtained by dissolving components 1 to 7, 9.0% of component 8 (of the total amount of the formulation example), and 25.0% of component 9 (of the total amount of the formulation example) at 80°C. B. The above composition 1 was treated in a high-pressure emulsifier. At that time, the temperature immediately before pressurization was set to 60° C. to 100° C., and emulsification was performed by treating at the set temperature under a pressure of 70 MPa to 100 MPa. C. After the pressure treatment, the above mixture was cooled to a temperature of 15° C. or lower to obtain emulsion composition 2. D. Components 10 to 12, the remainder of component 8, and a portion of component 9 were heated to 80° C. and mixed to obtain mixture 1. E. Mixture 1, ingredients 13 to 16, and the remainder of ingredient 9 were mixed into emulsion composition 2 at room temperature. F. The above mixture was defoamed to obtain an oil-in-water cream.

[0091] In Formulation Example 3, when the total amount of emulsion composition 2 is taken as 100%, the content of component (B) was 40.02%, (C) / (A)=2.26 (mass ratio), and (A)+(C)=3.96%. Emulsion composition 2 was creamy and had a viscosity of 10,000 mPa s or more.

[0092] Formulation example 4: Oil-in-water cream 2 (Ingredients) (Content) 1. Sodium surfactin (ingredient A) 0.5% 2. Sodium stearoyl methyl taurate (ingredient A) 0.8% 3. Trimethylolpropane triisostearate (ingredient B) 20.0% 4. Meadowfoam oil (ingredient B) 20.0% 5. Polyoxyethylene sorbitan monooleate (20EO) (ingredient C) 1.0% 6. Glycerin (ingredient D) 15.0% 7. 1,3-Butylene glycol (ingredient D) 10.0% 8. Remaining purified water 9. TEA 0.6% 10. Carbomer 0.02% 11. Stearic acid 0.8% 12. Glyceryl stearate 0.2% 13. Sorbitan oleate 0.02% 14. Cetearyl alcohol 0.4% 15. Behenyl alcohol 0.2% 16. Polysorbate 80 0.05% 17. Isohexadecane 0.2% 18. (Sodium acrylate / sodium acryloyldimethyltaurate) copolymer 0.4% 19. Ethyl oleate 0.5% 20. Propylene glycol dicaprate 0.5% 21. Cetyl ethylhexanoate 0.3% 22. Tocopherol 0.001% 23. Silica (*3) 2.0% 24. Mixture of Elderberry Flower Extract, Tea Leaf Extract, Tea Extract, Jasminum Sambac Flower Extract, Polyquaternium-51, Rosa Multiflora Fruit Extract, Rugosa Rose Flower Extract, Rosa Izayoi Extract, Water-Soluble Collagen, Royal Jelly Extract, Angelica acutiloba Root Extract, Rosa Centifolia Flower Extract, Rosa Damascena Flower Water, Rosemary Leaf Extract, Acerola Fruit Extract, Acetyl Glutamic Acid, Theanine, Glycine, Hydrolyzed Hyaluronic Acid, and Sodium Hyaluronate (Mixture of Cosmetic Ingredients) 1.0% 25. EDTA-2Na 0.04% 26. Sodium Phosphate 0.1% 27. Disodium Phosphate 0.1% 28. Caramel 0.02% 29. Phenoxyethanol 0.3% 30. Ethanol 3.0% 31.Fragrance 0.2% (*3) God Ball D-11 796C (manufactured by Suzuki Oil Industries Co., Ltd.)

[0093] (Manufacturing method) A. Composition 1 was obtained by dissolving components 1 to 7 and 15.0% of component 8 (out of the total amount in the formulation example) at 80°C under heating. B. The above composition 1 was treated in a high-pressure emulsifier. At that time, the temperature immediately before pressurization was set to 60° C. to 100° C., and emulsification was performed by treating at the set temperature under a pressure of 70 MPa to 100 MPa. C. After the pressure treatment, the above mixture was cooled to a temperature of 15° C. or lower to obtain emulsion composition 2. D. Components 9 and 10 and a portion of component 8 were heated to 80°C and mixed to obtain mixture 1. E. Components 11 to 23 were heated to 80°C and mixed to obtain mixture 2. F. The above mixtures 1 and 2 were mixed at 80° C. to obtain composition 3. G. Emulsion composition 2 was mixed with composition 3, the remainder of component 8, and components 24 to 31 at room temperature. H. The above mixture was defoamed to obtain an oil-in-water cream.

[0094] In Formulation Example 4, when the total amount of emulsion composition 2 is taken as 100%, the content of component (B) was 48.60%, (C) / (A)=0.77 (mass ratio), and (A)+(C)=2.79%. Emulsion composition 2 was creamy and had a viscosity of 10,000 mPa s or more.

[0095] Formulation example 5: Oil-in-water cleansing (Ingredients) (Content) 1. Sodium surfactin (ingredient A) 0.08% 2. Sodium stearoyl glutamate (ingredient A) 1.2% 3. Jojoba seed oil (ingredient B) 15.0% 4. Corn oil (ingredient B) 20.0% 5. Polyoxyethylene polyoxypropylene cetyl ether (ingredient C) 3.0% 6. Glycerin (ingredient D) 12.0% 7. 1,3-Butylene glycol (ingredient D) 8.0% 8. Remaining purified water 9. Carbomer 0.02% 10. Xanthan gum 0.02% 11. Sodium hydroxide 0.06% 12. Glyceryl stearate 0.2% 13. Cetearyl alcohol 2.0% 14. Behenyl alcohol 2.0% 15. Tocopherol 0.001% 16. Licorice flavonoids, rosemary leaf extract, apricot kernel oil, rosehip fruit extract, almond oil, corn oil mixture (beauty ingredient mixture) 0.3% 17. EDTA-2Na 0.04% 18. PEG-11 Cocamide 1.0% 19. Phenoxyethanol 0.3% 20. Ethanol 3.0% 21.Fragrance 0.2%

[0096] (Manufacturing method) A. Composition 1 was obtained by dissolving components 1 to 6, 7.0% of component 7 (of the total amount of the formulation example), and 20.0% of component 8 (of the total amount of the formulation example) at 80°C. B. The above composition 1 was treated in a high-pressure emulsifier. At that time, the temperature immediately before pressurization was set to 60° C. to 100° C., and emulsification was performed by treating at the set temperature under a pressure of 70 MPa to 100 MPa. C. After the pressure treatment, the above mixture was cooled to a temperature of 15° C. or lower to obtain emulsion composition 2. D. Components 9 to 11, the remainder of component 7, and a portion of component 8 were heated to 80° C. and mixed to obtain mixture 1. E. Components 12 to 15 were heated to 80°C and mixed to obtain mixture 2. F. The above mixtures 1 and 2 were mixed at 80° C. to obtain composition 3. G. Emulsion composition 2 was mixed with composition 3, components 16 to 21, and the remainder of component 8 at room temperature. H. The above mixture was defoamed to obtain an oil-in-water cleansing agent.

[0097] In Formulation Example 5, when the emulsion composition 2 was taken as the total amount (100%), the content of component (B) was 44.71%, (C) / (A)=2.34 (mass ratio), and (A)+(C)=5.47%. Emulsion composition 2 was creamy and had a viscosity of 10,000 mPa s or more.

[0098] Formulation example 6: Oil-in-water base (Ingredients) (Content) 1. Sodium surfactin (ingredient A) 0.05% 2. Sodium stearoyl methyl taurate (ingredient A) 0.7% 3. Trimethylolpropane triisostearate (ingredient B) 15.0% 4. Dimethicone (viscosity 6cs) (ingredient B) 10.0% 5. Hydrogenated polyisobutene (component B) (*4) 5.0% 6. Polyoxyethylene behenyl ether (ingredient C) 2.1% 7. Glycerin (ingredient D) 15.0% 8. 1,3-Butylene glycol (ingredient D) 10.0% 9. Remaining purified water 10. Xanthan gum 0.1% 11. (Acrylates / C10-30 alkyl acrylate) crosspolymer 0.1% 12. Sodium hydroxide 0.1% 13. Ethylhexyl methoxycinnamate 2.0% 14. Bis-ethylhexyl hexyl benzoate 1.0% 15. Ceterial alcohol 0.5% 16. Polyglyceryl-10 myristate 0.5% 17. Polyglyceryl stearate-10 0.5% 18. Polyglyceryl-10 Sesquistearate 0.3% 19. Sorbitan Sesquistearate 0.3% 20. Propylene glycol di(caprylate / caprate) 3.0% 21. Pentaerythrityl tetraethylhexanoate 0.5% 22. Titanium oxide treated with 3% aluminum hydroxide (average particle size 0.25 μm) (*5) 1.0% 23. Alumina-stearic acid treated titanium dioxide (70.0%) / Nylon-12 (30.0%) (*6) 1.0% 24. Barium sulfate 0.1% 25. Polymethylsilsesquioxane 0.1% 26. Titanium oxide / iron oxide coated mica (*7) 0.5% 27. Silica (*8) 1.0% 28. Mixture of water-soluble collagen, rose centifolia flower extract, royal jelly extract, and orange flower water (mixture of beauty ingredients) 0.3% 29. Ethanol 5.0% 30. Methylparaben 0.1% 31.Fragrance 0.2% (*4) Pearleem 6 (manufactured by NOF Corp.) (*5)MP-1133 (manufactured by Teika) (*6) MTXO-70NL (Hayate Material Co., Ltd.) (*7) TIMICA RADIANT GOLD 222G (Engelhart) (*8) Silica Microbeat P-1505 (manufactured by JGC Catalysts and Chemicals)

[0099] A. Composition 1 was obtained by dissolving components 1 to 7, 9.0% of component 8 (of the total amount of the formulation example), and 10.0% of component 9 (of the total amount of the formulation example) at 80°C. B. The above composition 1 was treated in a high-pressure emulsifier. At that time, the temperature immediately before pressurization was set to 60° C. to 100° C., and emulsification was performed by treating at the set temperature under a pressure of 70 MPa to 100 MPa. C. After the pressure treatment, the above mixture was cooled to a temperature of 15° C. or lower to obtain emulsion composition 2. D. Components 10 to 12, the remainder of component 8, and a portion of component 9 were heated to 80° C. and mixed to obtain mixture 1. E. Components 13 to 27 were heated to 80°C and mixed to obtain mixture 2. F. The above mixtures 1 and 2 were mixed at 80° C. to obtain composition 3. G. Emulsion composition 2 was mixed with composition 3, components 28 to 31, and the remainder of component 9 at room temperature. H. The above mixture was degassed to obtain an oil-in-water base.

[0100] In Formulation Example 6, when the total amount of emulsion composition 2 is taken as 100%, the content of component (B) was 44.88%, (C) / (A)=2.80 (mass ratio), and (A)+(C)=4.26%. Emulsion composition 2 was creamy and had a viscosity of 10,000 mPa s or more.

[0101] Formulation example 7: Oil-in-water sunscreen 1 (Ingredients) (Content) 1. Sodium surfactin (ingredient A) 0.06% 2. Sodium stearoyl glutamate (ingredient A) 0.6% 3. Jojoba seed oil (ingredient B) 5.0% 4. Dimethicone (viscosity 6cs) (ingredient B) 10.0% 5. Liquid paraffin (ingredient B) (*2) 10.0% 6. Polyoxyethylene polyoxypropylene decyl tetradecyl ether (ingredient C) 1.8% 7. Glycerin (ingredient D) 15.0% 8. 1,3-Butylene glycol (ingredient D) 10.0% 9. Remaining purified water 10. (Acrylates / C10-30 alkyl acrylate) crosspolymer 0.1% 11. Carbomer 0.01% 12. Xanthan gum 0.1% 13. TEA 1.0% 14. Ethylhexyl methoxycinnamate 7.0% 15. Polysilicone-15 0.5% 16. Methylenebisbenzotriazolyltetrabutylphenol 1.0% 17. Neopentyl glycol dicaprate 0.5% 18. Diphenylsiloxyphenyl trimethicone 0.5% 19. Cyclopentasiloxane 1.0% 20. (Acrylates / Dimethicone) Copolymer 0.1% 21. Ceterial alcohol 0.5% 22. Stearic acid 0.5% 23. PEG-30 Phytosterol 0.3% 24. Polysorbate 60 0.3% 25. Polysorbate 80 0.1% 26. Sorbitan Oleate 0.1% 27. Methyl glucose sesquistearate 0.2% 28. Glyceryl stearate 0.2% 29. (Sodium acrylate / sodium acryloyldimethyltaurate) copolymer 0.4% 30. Isohexadecane 0.1% 31. DL-α-tocopherol acetate 0.01% 32. 0.5% lecithin treated and 3% aluminum hydroxide treated titanium dioxide (0.25 μm) 0.5% 33. Dimethicone, aluminum hydroxide, hydrated silica-treated titanium dioxide (average particle size: 0.030 μm) (*9) 1.0% 34. Titanium oxide / tin oxide coated borosilicate (Ca / Al)(*10) 0.1% 35. Boron nitride(*11) 0.5% 36. Titanium oxide / silica-coated mica (*12) 0.5% 37. Triisodecyl isononanoate 0.5% 38. Licorice flavonoids, rosemary leaf extract, apricot kernel oil, rosehip fruit extract, almond oil, corn oil mixture (beauty ingredient mixture) 0.3% 39. EDTA-2Na 0.01% 40. Ethanol 3.0% 41. Phenoxyethanol 0.2% 42.Fragrance 0.4% (*9) SMT-500SAM (manufactured by Teika) (*10) Microglass Metashine MT1080RS (Nippon Sheet Glass Co., Ltd.) (*11)CCS102-JA BORON NITRIDE POWDER (manufactured by Momentive Performance Materials Japan) (*12) TIMIRON SPLEMDID RED (Merck)

[0102] (Manufacturing method) A. Composition 1 was obtained by dissolving components 1 to 7, 9.0% of component 8 (of the total amount of the formulation example), and 15.0% of component 9 (of the total amount of the formulation example) at 80°C. B. The above composition 1 was treated in a high-pressure emulsifier. At that time, the temperature immediately before pressurization was set to 60° C. to 100° C., and emulsification was performed by treating at the set temperature under a pressure of 70 MPa to 100 MPa. C. After the pressure treatment, the above mixture was cooled to a temperature of 15° C. or lower to obtain emulsion composition 2. D. Components 10 to 13, the remainder of component 8, and a portion of component 9 were heated to 80° C. and mixed to obtain mixture 1. E. Components 14 to 37 were heated to 80°C and mixed to obtain mixture 2. F. The above mixtures 1 and 2 were mixed at 80° C. to obtain composition 3. G. Emulsion composition 2 was mixed with composition 3, ingredients 38 to 42, and the remainder of ingredient 9 at room temperature. H. The above mixture was degassed to obtain an oil-in-water sunscreen.

[0103] In Formulation Example 7, when the total amount of emulsion composition 2 is taken as 100%, the content of component (B) was 37.62%, (C) / (A)=2.73 (mass ratio), and (A)+(C)=3.70%. Emulsion composition 2 was creamy and had a viscosity of 10,000 mPa s or more.

[0104] Formulation example 8: Oil-in-water sunscreen 2 (Ingredients) (Content) 1. Sodium surfactin (ingredient A) 0.12% 2. Sodium dilauroyl glutamate lysine (ingredient A) 0.03% 3. Sodium stearoyl methyl taurate (ingredient A) 1.0% 4. Dimethicone (viscosity 6cs) (ingredient B) 10.0% 5. Liquid paraffin (ingredient B) (*2) 15.0% 6. Macadamia seed oil (ingredient B) 10.0% 7. Polyoxyethylene polyoxypropylene decyl tetradecyl ether (ingredient C) 2.8% 8. Glycerin (ingredient D) 15.0% 9. 1,3-Butylene glycol (ingredient D) 10.0% 10. Remaining purified water 11. (Acrylates / C10-30 alkyl acrylate) crosspolymer 0.1% 12. Carbomer 0.1% 13. Xanthan gum 0.1% 14. Sodium hydroxide 0.1% 15. Ethylhexyl methoxycinnamate 4.0% 16. Dibutyl adipate 1.0% 17. Isododecane 1.0% 18. Triethylhexanoin 0.5% 19. Hydrogenated polyisobutene (*13) 1.0% 20. Ceterial alcohol 0.2% 21. Behenyl alcohol 0.2% 22. Ethyl oleate 0.1% 23. Polysorbate 80 0.3% 24. Sorbitan Sesquioleate 0.3% 25. Di(C12-15)palladium-8 phosphate 0.1% 26. Polyglyceryl-2 Isostearate 0.2% 27. Titanium dioxide treated with 2% alumina / 10% silica (average particle size 0.4 μm) (*14) 0.5% 28. Titanium oxide treated with 3% aluminum hydroxide (average particle size 0.25 μm) (*15) 0.3% 29. Silica(*16) 0.3% 30. Silica (*17) 0.2% 31. Nylon-12(*18) 0.1% 32. Mixture of jasmine flower extract, grape leaf extract, peppermint leaf extract, bifidobacterium culture lysate, cherry blossom extract, polyquaternium-51, rose multiflora fruit extract, rosehip flower extract, rosa robur extract, tocopherol acetate, water-soluble collagen, royal jelly extract, angelica root extract, rosa centifolia flower extract, rosa damask flower water, rosemary leaf extract, acerola fruit extract, acetyl glutamic acid, theanine, glycine, hydrolyzed hyaluronic acid, and sodium hyaluronate (mixture of beauty ingredients) 1.0% 33. Ethanol 3.0% 34. Phenoxyethanol 0.2% 35.Fragrance 0.2% (*13) Dedraflow5 (CIT Sarl) (*14) SYMPHOLIGHT WW-E (manufactured by JGC Catalysts and Chemicals) (*15) TIPAQUE CR-50 (Ishihara Sangyo Kaisha) (*16) God Ball E-90C (manufactured by Suzuki Oil Industries Co., Ltd.) (*17) Sunsphere NP-200 (AGC Si-Tech) (*18) Ganz Pearl GM-2800 (manufactured by Nihon Koken Kogyo Co., Ltd.)

[0105] (Manufacturing method) A. Composition 1 was obtained by heating and dissolving components 1 to 8, 9.0% of component 9 (of the total amount of the formulation example), and 10.0% of component 10 (of the total amount of the formulation example) at 80°C. B. The above composition 1 was treated in a high-pressure emulsifier. At that time, the temperature immediately before pressurization was set to 60° C. to 100° C., and emulsification was performed by treating at the set temperature under a pressure of 70 MPa to 100 MPa. C. After the pressure treatment, the above mixture was cooled to a temperature of 15° C. or lower to obtain emulsion composition 2. D. Components 11 to 14, the remainder of component 9, and a portion of component 10 were heated to 80° C. and mixed to obtain mixture 1. E. Components 15 to 30 were heated to 80°C and mixed to obtain mixture 2. F. The above mixtures 1 and 2 were mixed at 80° C. to obtain composition 3. G. Emulsion composition 2 was mixed with composition 3, components 31 to 35, and the remainder of component 10 at room temperature. H. The above mixture was degassed to obtain an oil-in-water sunscreen.

[0106] In Formulation Example 8, when the emulsion composition 2 was taken as the total amount (100%), the content of component (B) was 47.98%, (C) / (A)=2.43 (mass ratio), and (A)+(C)=5.41%. Emulsion composition 2 was creamy and had a viscosity of 10,000 mPa s or more.

Claims

1. The following components (A) to (D): (A) two or more amide bond-containing anionic surfactants each having a different number of amide bonds; (B) a liquid oil agent in an amount of 20 to 60% by mass based on the total amount of the composition; (C) a nonionic surfactant having an HLB of 10 or more, and (D) a polyhydric alcohol, A creamy oil-in-water emulsion composition comprising:

2. 2. The oil-in-water emulsion composition according to claim 1, having a viscosity of 10,000 mPa·s or more.

3. 2. The oil-in-water emulsion composition according to claim 1, wherein at least one of the components (A) is an amino acid-derived surfactant.

4. 2. The oil-in-water emulsion composition according to claim 1, wherein at least one of the components (A) is sodium surfactin.

5. 2. The oil-in-water emulsion composition according to claim 1, wherein the ratio of the contents of component (C) to component (A) ((C) / (A)) is 0.1 to 5 in terms of mass ratio.

6. 2. The oil-in-water emulsion composition according to claim 1, wherein the total content of component (A) and component (C) is 6% by mass or less, based on the total amount of the composition.

7. 2. The oil-in-water emulsion composition according to claim 1, wherein component (B) is at least one oil selected from the group consisting of non-polar oils and polar oils having a molecular weight of 500 or more.

8. 2. The oil-in-water emulsion composition according to claim 1, wherein component (C) is at least one selected from the group consisting of polyoxyethylene hydrogenated castor oil, fatty acid polyoxyethylene hydrogenated castor oil, polyoxyethylene fatty acid sorbitan, and polyoxyalkylene alkyl ether.

9. 2. The oil-in-water emulsion composition according to claim 1, wherein component (D) is at least one selected from glycerin and 1,3-butylene glycol.

10. 2. The oil-in-water emulsion composition according to claim 1, wherein the composition comprising components (A) to (D) has emulsion particles emulsified by applying pressure at a temperature in the range of 60 to 100°C.

11. An oil-in-water emulsion cosmetic comprising the oil-in-water emulsion composition according to any one of claims 1 to 10.

12. A method for producing the oil-in-water emulsion composition according to any one of claims 1 to 10, comprising the step of emulsifying a composition comprising components (A) to (D) under pressure at a temperature in the range of 60 to 100°C.