JP2024061324A - Oil-in-water emulsion composition and emulsion cosmetic - Google Patents

Abstract

[Problem] To provide an oil-in-water emulsion composition that is transparent and has excellent stability over time, and an oil-in-water emulsion cosmetic. [Solution] The present invention relates to a transparent or translucent oil-in-water emulsion composition that contains (A) sodium surfactin, (B) a liquid oil, (C) 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, (D) an anionic surfactant, and (E) a polyhydric alcohol, as well as a method for producing the same, and an oil-in-water emulsion cosmetic. [Selected Figures] None

Description

The present invention relates to a transparent or translucent oil-in-water emulsion composition, a method for producing the same, and an oil-in-water emulsion cosmetic using the same.

Since oil-in-water emulsion compositions and oil-in-water emulsion cosmetics are made by dispersing oil in water as an emulsion, they are often cloudy and opaque, but for certain applications and purposes, transparent or translucent oil-in-water emulsion compositions and emulsion cosmetics may be required. In particular, transparent or translucent oil-in-water emulsion cosmetics can give a refreshing impression and feel when used.

As an example of a translucent oil-in-water emulsion cosmetic, Patent Document 1 discloses a translucent emulsion cosmetic containing squalane, phospholipids, polyhydric alcohol, and difatty acid acyl glutamic acid lysine salt in specific amounts. Patent Document 2 discloses a transparent aqueous cosmetic containing mannosylerythritol lipid, one or more selected from polyoxyethylene hydrogenated castor oil and polyoxyethylene fatty acid sorbitan, polyalkylene glycol having a number average molecular weight of 200 to 200,000, water, and an oil agent under specific conditions (amounts and ratios).

However, according to the invention of Patent Document 1, the oil is limited to squalane, and it is expected that when an oil other than squalane is blended, the transparency will be insufficient and the oil phase will separate, which will likely lead to poor emulsion stability. Also, according to the invention of Patent Document 2, it is expected that when the oil content is relatively high (especially exceeding 3 mass%), the transparency will likely be insufficient, the dispersibility of the oil will be poor, and stability will likely decrease.

Patent No. 4659810 JP 2017-14135 A

The present invention aims to provide an oil-in-water emulsion composition that is transparent and has excellent stability over time, and an emulsion cosmetic that uses the emulsion composition.

The present invention includes, but is not limited to, the embodiments listed below.
[1] The following components (A) to (E):
(A) sodium surfactin,
(B) a liquid oil agent;
(C) 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,
(D) an anionic surfactant, and
(E) a polyhydric alcohol,
(Hereinafter, the oil-in-water emulsion composition of the present invention will be referred to as "the present emulsion composition").
[2] The oil-in-water emulsion composition according to [1], having a light transmittance of 50% or more at a wavelength of 700 nm.
[2-1] The oil-in-water emulsion composition according to [1] or [2], wherein the emulsion particles have a particle size of 200 nm or less.
[3] The oil-in-water emulsion composition according to [1], [2] or [2-1], wherein the content of component (A) is 0.0001 to 1 mass % based on the total amount of the composition.
[4] The oil-in-water emulsion composition according to any one of [1] to [3], wherein the content of component (B) is 0.001 to 15 mass% based on the total amount of the composition.
[5] The oil-in-water emulsion composition according to any one of [1] to [4], wherein the ratio of the contents of component (C) to component (D) ((C)/(D)) is, in mass ratio, 0.5 to 50.
[6] The oil-in-water emulsion composition according to any one of [1] to [5], wherein the total content of component (C) and component (D) is 5 mass% or less based on the total amount of the composition.
[7] The oil-in-water emulsion composition according to any one of [1] to [6], wherein component (C) is a polyoxyalkylene alkyl ether.
[8] The oil-in-water emulsion composition according to any one of [1] to [7], wherein component (D) is one or more selected from sodium stearoyl glutamate and sodium methyl stearoyl taurate.
[9] The oil-in-water emulsion composition according to any one of [1] to [8], wherein component (E) is one or more selected from glycerin and 1,3-butylene glycol.
[10] The oil-in-water emulsion composition according to any one of [1] to [9], wherein the composition comprising components (A) to (E) has emulsion particles emulsified by pressurizing in the range of 20 to 100° C.
[11] An oil-in-water emulsion cosmetic comprising the oil-in-water emulsion composition according to any one of [1] to [10] (hereinafter, the oil-in-water emulsion cosmetic of the present invention is referred to as the "present emulsion cosmetic").
[12] A method for producing the oil-in-water emulsion composition according to any one of [1] to [11], comprising the step of emulsifying a composition containing components (A) to (E) under pressure within the range of 20 to 100°C.

The present invention provides an oil-in-water emulsion composition that is transparent and has excellent stability over time, and an emulsion cosmetic that uses the emulsion composition.

The oil-in-water emulsion composition of the present invention comprises the following components (A) to (E):
(A) sodium surfactin,
(B) a liquid oil agent;
(C) 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,
(D) an anionic surfactant, and
(E) a polyhydric alcohol,
and is transparent or translucent.
In this specification, (A) to (E) are symbolic symbols of components, and hereinafter may be referred to as component (A), etc.

The present emulsion composition has transparency and excellent stability over time. In this specification, transparency means that when an object (emulsion composition) is viewed from a certain direction, the opposite side of the object (emulsion composition) can be clearly seen through, and translucency means that the opposite side of the object (emulsion composition) can be seen through, even though it is cloudy or distorted. In this specification, transparency means a measure of physical properties that indicate a state closer to transparency between opaque and transparent. Therefore, "having transparency" does not mean only complete transparency, except for opacity, but may also include translucency. In addition, when it is said to have "excellent transparency", it means a higher level of transparency and may also include the case of translucency. Transparent or opaque may be judged in a state in which the present emulsion composition or the present emulsion cosmetic is normally used, and may be visually transparent or opaque when placed in a transparent container. Specifically, in this specification, translucent means that when the transmittance of visible light (hereinafter sometimes simply referred to as "light") passing through the composition, for example, in a cell with a light path length of 1 cm, is measured with a spectrophotometer, the transmittance of light at a wavelength of 700 nm is at least 50%. Transparent also means that the transmittance of light is higher than translucent, and therefore the transmittance of light at a wavelength of 700 nm is greater than the above value. In the spectrophotometer measurement, a sample of the composition may be compared with the transmittance of water, for example, as a control. Stability over time means that emulsion stability and transparency are sustained.

Component (A)
Component (A) is sodium surfactin. Sodium surfactin (also written as surfactin Na) is a naturally derived surfactant (biosurfactant) obtained from surfactin, a component contained in natto, and is a component that can function as an emulsifier. Sodium surfactin has a cyclic peptide structure consisting of amino acids and fatty acids, and is obtained by fermentation of Bacillus subtilis. The chemical structure of sodium surfactin can be confirmed under the name "Sodium surfactin" on the Internet site PubChem (https://pubchem.ncbi.nlm.nih.gov/) provided by the National Institutes of Health (NIH). 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.

In this emulsion composition, by blending sodium surfactin, it is possible to obtain an oil-in-water emulsion composition with high transparency, excellent emulsification dispersibility, and excellent stability over time due to the high surface activity of sodium surfactin. In addition, it has been confirmed that sodium surfactin provides superior transparency and stability to compositions containing it in a system (blended composition) such as this emulsion composition, compared to other surfactants that are considered to have high surface activity (see Examples). Sodium surfactin is commercially available. Although not limited to theory, sodium surfactin has a larger molecular size than general surfactants and is likely to line up on the surface of water, so it is thought that it has the property of requiring a low concentration for micelle formation. Therefore, it is presumed that sodium surfactin preferentially covers the surface of water and becomes saturated, promoting micelle formation, and that even when used in combination with other surfactants, the concentrations required for micelle formation of those surfactants can be significantly reduced. However, the present invention is not limited to the above speculation.

The content of component (A) in the present emulsion composition is not limited to this, but from the viewpoint of obtaining high transparency and stability, it can be, for example, 0.000001 to 1 mass% relative to the total amount (100 mass%) of the present emulsion composition, preferably 0.00001 to 0.8 mass%, and more preferably 0.0001 to 0.5 mass%. Furthermore, the content of sodium surfactin in component (A) is even more preferably 0.001 to 0.1 mass%.

Component (B)
Component (B) is a liquid oil. By containing a liquid oil, an emulsion composition having good skin affinity and excellent usability can be obtained. The liquid oil is liquid at the normal use temperature of the 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.

Examples of oils for component (B) include natural or synthetic hydrocarbon oils, ester oils, vegetable oils, silicone oils, etc. Specific examples of oils include, but are not limited to, hydrocarbon oils such as squalane, liquid paraffin (also called mineral oil), isohexadecane, isododecane, and hydrogenated polyisobutene. Examples of ester oils include cetyl 2-ethylhexanoate, isotridecyl isononanoate, ethyl oleate, di-2-ethylhexyl succinate, ethylhexyl methoxycinnamate, tritridecyl trimellitate, pentaerythritol tetraisostearate, ascorbyl tetrahexyldecanoate, pentaerythrityl tetraethylhexanoate, propylene glycol dicaprate, glyceryl tri-2-ethylhexanoate, glyceryl tri(caprylic acid/capric acid), trimethylolpropane triisostearate, and triethylhexanoin. Examples of vegetable oils include jojoba seed oil, macadamia seed oil, meadowfoam oil, hydrogenated coconut oil, olive oil, etc. Examples of silicone oils include dimethicone, methylphenylpolysiloxane, diphenylsiloxyphenyltrimethicone, etc.

As component (B), squalane, jojoba seed oil, meadowfoam oil, dimethicone, macadamia seed oil, cetyl ethylhexanoate, trimethylolpropane triisostearate, pentaerythrityl tetraethylhexanoate, ethyl oleate, propylene glycol dicaprate, triethylhexanoin, hydrogenated polyisobutene, and isotridecyl isononanoate are more preferred. In this case, it becomes easier to obtain an emulsion composition with a better feel when used.

Component (B) blended in this emulsion composition may be one or more of the above components.

The content of component (B) (the total amount when there are multiple components) is preferably 0.0001 to 20% by mass relative to the total amount of the composition (100% by mass). This makes it possible to obtain an emulsion composition that is compatible with the skin and does not leave a sticky feeling on the skin after application. The content of the liquid oil is more preferably 0.0005 to 18% by mass, and even more preferably 0.001 to 15% by mass, relative to the total amount of the composition. Furthermore, the content of the oil may be 10% by mass or less, for example, 0.01 to 10% by mass, or even 0.1 to 10% by mass. When the amount of the liquid oil is increased, it becomes easier to obtain an emulsion composition that is compatible with the skin and has an excellent feel when used, and when the amount of the liquid oil is decreased, it becomes easier to obtain an emulsion composition that is not sticky and leaves a good finish on the skin after application.

Component (C)
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. By blending component (C), the stability of the present emulsion composition can be further improved. All of the compounds of component (C) are substances classified as nonionic surfactants.

Component (C) may be one, two, three or four of the above components. When component (C) is two or more of the above components, the combination may be any combination. For example, when component (C) is two of the above components, it may be a combination of polyoxyethylene hydrogenated castor oil and fatty acid polyoxyethylene hydrogenated castor oil, a combination of polyoxyethylene hydrogenated castor oil and polyoxyethylene fatty acid sorbitan, a combination of polyoxyethylene hydrogenated castor oil and polyoxyalkylene alkyl ether, or a combination of polyoxyethylene fatty acid sorbitan and polyoxyalkylene alkyl ether. Also, when component (C) is three of the above components, it may be a combination of polyoxyethylene hydrogenated castor oil, polyoxyethylene fatty acid sorbitan, and polyoxyalkylene alkyl ether.

Polyoxyethylene hydrogenated castor oils exist with different average moles of ethylene oxide added (represented by "E.O."), but for example, those with an E.O. of 5 to 100 can be used, with those with an E.O. of 10 to 60 being preferred, and those with an E.O. of 10 to 40 being more preferred. 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.

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. Fatty acid polyoxyethylene hydrogenated castor oils differ in the average number of moles of ethylene oxide added (represented by "E.O."), and for example, those with an E.O. of 5 to 100 can be used, those with an E.O. of 10 to 70 are preferred, and those with an E.O. of 20 to 60 are more preferred. Examples of fatty acid polyoxyethylene hydrogenated castor oil include polyoxyethylene isostearate (50 EO) hydrogenated castor oil.

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 preferably has 8 to 24 carbon atoms, more preferably 9 to 22 carbon atoms, and even more preferably 10 to 20 carbon atoms. 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 "E.O."). For example, one with an E.O. of 5 to 100 can be used, one with an E.O. of 10 to 60 is preferred, and one with an E.O. of 20 to 40 is more preferred.

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 E.O. of 20, for example.

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 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 may be, for example, an ether compound formed from a higher alcohol and an alkylene oxide.

Specific examples of polyoxyalkylene alkyl ethers include polyoxyethylene polyoxypropylene decyl tetradecyl ether, polyoxyethylene polyoxypropylene cetyl ether, polyoxyethylene polyoxypropylene decyl ether, and polyoxyethylene polyoxypropylene butyl ether. As component (C), polyoxyalkylene alkyl ethers are more preferred than polyoxyethylene hydrogenated castor oil and polyoxyethylene fatty acid sorbitan. That is, in one embodiment, component (C) is preferably a polyoxyalkylene alkyl ether.

Component (C) blended in the present emulsion composition may be one or more of the above components. For example, there are multiple types of polyoxyalkylene alkyl ethers and polyoxyethylene fatty acid sorbitan that differ in the number of carbon atoms, and multiple of these different components may be blended.

The content of component (C) (the total amount when there are multiple components) is not limited to the above, but from the viewpoint of obtaining high transparency and emulsion stability, it is preferably 0.1 to 4.5% by mass, more preferably 0.2 to 4% by mass, and even more preferably 0.5 to 3% by mass, relative to the total amount (100% by mass) of the emulsion composition. In particular, it is preferable that the content of component (C) is 3% by mass or less.

Component (D)
Component (D) is an anionic surfactant. The incorporation of an anionic surfactant improves transparency and improves stability over time. Specific examples of the anionic surfactant include, but are not limited to, N-acyl glutamate such as sodium stearoyl glutamate, acyl methyl taurine salts of higher fatty acids such as sodium stearoyl methyl taurine, and acyl lactate such as sodium stearoyl lactate, fatty acid soaps such as sodium distearoyl glutamate lysine, sodium dilauroyl glutamate lysine, and sodium laurate, higher alkyl sulfates such as sodium lauryl sulfate, alkyl ether sulfates such as POE-triethanolamine lauryl sulfate, and phosphates such as sodium POE-oleyl ether phosphate.

Component (D) is preferably an N-acyl glutamate or an acyl methyl taurate salt of a higher fatty acid, and more preferably at least one selected from sodium stearoyl glutamate and sodium stearoyl methyl taurate. This further improves the transparency and stability of the emulsion composition.

Component (D) blended in this emulsion composition may be one or more of the above anionic surfactants.

The content of component (D) (the total amount when there are multiple components) is not limited to the above, but from the viewpoint of obtaining transparency and stability, it is preferably 0.01 to 2.8% by mass, more preferably 0.02 to 2.5% by mass, and even more preferably 0.05 to 2% by mass, relative to the total amount (100% by mass) of the emulsion composition.

Here, the ratio of the contents of components (C) and (D) ((C)/(D)) is preferably 0.2 to 100 by mass, and more preferably 0.5 to 50 by mass. The ratio of the content of component (C) to the content of component (D) as described above improves transparency, provides excellent stability, and makes it easier to obtain an emulsion composition with excellent usability. In particular, it is preferable that the ratio of the contents of components (C) and (D) ((C)/(D)) is 0.5 to 50 by mass, and the content of component (C) is 3% by mass or less of the total amount of the composition.

In addition, the total content of components (C) and (D) is preferably 5% by mass or less relative to the total amount of the composition (100% by mass). When the contents of components (C) and (D) are reduced, excellent stability is obtained and it becomes easier to obtain an emulsion composition with excellent usability. The total content of components (C) and (D) is preferably 4.5% by mass or less, more preferably 4% by mass or less. The lower limit of the total content of components (C) and (D) is not particularly limited, but the total content can be, for example, 0.01% or more. In this emulsion composition, it is particularly preferable that the ratio of the contents of components (C) and (D) ((C)/(D)) is 0.5 to 50 by mass, and the total content of components (C) and (D) is 5% by mass or less, more preferably 4.5% by mass or less, or even 4% by mass or less relative to the total amount of the composition.

Component (E)
Component (E) 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 improves stability. 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 it 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 (E) may be one type of polyhydric alcohol or a combination of two or more types. Component (E) is more preferably one or more types selected from glycerin and 1,3-butylene glycol. In that case, stability is further improved.

The content of component (E) (the total amount when there are multiple components) is not limited to the above, but from the viewpoint of obtaining a stable emulsion composition, it can be 1 to 40% by mass, preferably 2 to 30% by mass, and more preferably 5 to 20% by mass, relative to the total amount (100% by mass) of the emulsion composition.

Other components than the above: Water The emulsion composition may contain water. In the oil-in-water emulsion composition, the emulsion form is oil-in-water (O/W), the water phase is the outer phase, and the oil phase is the inner phase. The water phase may contain water-soluble substances and hydrophilic substances. The water is not limited to this, but purified water is preferably used.

The water content in the present oil-in-water emulsion composition is not limited to this amount, but can be 1 to 99% by mass, preferably 10 to 98% by mass, more preferably 20 to 95% by mass, and even more preferably 30 to 90% by mass. Depending on the form of the formulation, the water content may be 50% by mass or more, or 60% by mass or more.

[0043] 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 other than component (C), cationic surfactants, amphoteric surfactants, monohydric alcohols, moisturizers, thickeners, polymers, pigments, film-forming agents, pH adjusters, anti-fading agents, antioxidants, defoamers, powders, cosmetic ingredients, plant extracts, preservatives, and fragrances.

Examples of non-liquid oils include semi-solid or solid oils. Here, the properties of the oil (semi-solid or solid) refer to the properties 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. However, from the viewpoint of stability, it is preferable that the emulsion composition does not contain a solid oil, and it is more preferable that the emulsion composition does not contain both a semi-solid oil and a solid oil.

Nonionic surfactants other than component (C) include sorbitan fatty acid esters such as sorbion sesquiisostearate, sorbion palmitate, and sorbitan oleate, sucrose fatty acid esters, etc. 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. 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.

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), component (D), 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.

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

The emulsion composition may contain a preservative. Examples of preservatives include, but are not limited to, methyl paraoxybenzoate (also known as methylparaben) and phenoxyethanol.

The emulsion composition is transparent or translucent. When the emulsion composition is transparent or translucent, it is possible to give a refreshing impression and feeling of use. The emulsion composition may be colorless and transparent. Alternatively, the emulsion composition may be, for example, cloudy white and translucent. In addition, if the emulsion composition is translucent or transparent, it may be colored (for example, red, blue, green, yellow, etc.). The emulsion composition may be colored, for example, by using a soluble colorant. The degree of transparency or opacity, i.e., transparency, can be quantified by the transmittance of light (particularly visible light).

The present emulsion composition preferably has a light transmittance of 50% or more at a wavelength of 700 nm. This allows the emulsion composition to be reliably transparent or translucent. The light transmittance can be measured with a spectrophotometer. The light transmittance is preferably 60% or more, more preferably 70% or more, and even more preferably 80% or more. For example, when the light transmittance is 50% or more, it may be visually slightly cloudy when placed in a glass container (e.g., a 100 mL glass sample bottle), but transparent when picked up. Furthermore, when the light transmittance is 80% or more, it may be visually transparent even when placed in a glass container (e.g., a 100 mL glass sample bottle). There is no particular upper limit for the light transmittance, but the upper limit is 100%, which is completely transparent. As a spectrophotometer device, for example, GeneQuant 1300 (manufactured by BioChrom) can be used.

In the present emulsion composition, the light transmittance is preferably such that the light transmittance is maintained at the above value not only immediately after production but also over time. In other words, it is preferable that the composition has stable transparency. Specifically, in the present emulsion composition, the light transmittance at a wavelength of 700 nm after being left at 40°C for one month is preferably 50% or more, more preferably 60% or more, more preferably 70% or more, and even more preferably 80% or more. Alternatively, in the present emulsion composition, the light transmittance at a wavelength of 700 nm after being left at room temperature for one year is preferably 50% or more, more preferably 60% or more, more preferably 70% or more, and even more preferably 80% or more.

The emulsion composition is emulsified and has emulsion particles. For the emulsion composition to have transparency, 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 potential meter and performing cumulant analysis.

The present emulsion composition preferably has emulsion particles emulsified by pressurizing a composition containing components (A) to (E) in the range of 20 to 100 ° C. Emulsion particles emulsified by pressurization tend to be stabilized by having a smaller particle size. In addition, the smaller particle size of the emulsion tends to increase transparency. 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. The transmittance may be a parameter that is somewhat correlated with the particle size, and when the transmittance is 50% or more, 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 heated high-pressure emulsification are described in the manufacturing method below, but all descriptions in the explanation of the manufacturing method are incorporated herein as explanations of the emulsion composition.

The present emulsion cosmetic contains the present emulsion composition. This can provide a transparent or translucent oil-in-water emulsion cosmetic. The present emulsion composition can provide a cosmetic that is transparent, has excellent stability, blends well with the skin, and is less sticky and feels good when used. The present emulsion cosmetic can contain the components of the present emulsion composition described above, and the content and content ratio of each component is preferably the same as that described for the present emulsion composition. Specifically, the content of component (A) in the present emulsion cosmetic is preferably 0.0001 to 1 mass% based on the total amount of the present emulsion cosmetic. The content of component (B) is preferably 0.001 to 15 mass% based on the total amount of the present emulsion cosmetic. The ratio of the content of component (C) to component (D) ((C)/(D)) is preferably 0.5 to 50 by mass. The total content of component (C) and component (D) is preferably 5 mass% or less based on the total amount of the present emulsion cosmetic.

In addition to the present emulsion composition, the present emulsion cosmetic may contain various raw material components that can be used as raw materials for cosmetics. For example, the present emulsion cosmetic may contain a powder. Examples of powder 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 an oil such as a solid oil or a semi-solid oil. The present emulsion cosmetic may also be obtained by mixing the above-mentioned emulsion composition with another emulsion composition. The present emulsion cosmetic may become opaque due to additional blending components. However, even if the present emulsion cosmetic is opaque, by forming it with the transparent or translucent present emulsion composition described above, an emulsion with a small emulsion particle size is present, and an emulsion cosmetic that has a good feel when used and is stable over time can be obtained.

The present emulsion cosmetic can be a skin cosmetic or a hair cosmetic. It is particularly preferable that the present emulsion cosmetic is a skin cosmetic (oil-in-water emulsion cosmetic for skin). In addition, the present emulsion cosmetic can be used as an emulsion cosmetic for all purposes, including skin care products and makeup products.

As long as the skin cosmetic is in the form of an oil-in-water emulsion, it can be used as a cosmetic for various purposes without any particular limitation. Examples include lotions, beauty essences, milky lotions, creams, hand creams, eye creams, body creams, makeup cosmetics, eye shadows (eye colors), makeup bases, gels, cleansers, sunscreens, and other cosmetics. Methods for using skin cosmetics include applying them to hands or fingers, using cotton, impregnating nonwoven fabric, and spraying or misting them.

There are no particular limitations on the hair cosmetic product, so long as it is in the form of an oil-in-water emulsion, and it can be used as a cosmetic product for a variety of purposes. Examples include cosmetics such as hair cream, hair wax, hair rinse, hair mask, hair treatment, sunscreen for hair, shampoo, and conditioner. Methods for using hair cosmetics include applying it to the hands or fingers, or spraying it with a spray or mist.

The present emulsion composition can be produced by mixing the above-mentioned components. For example, a method can be used in which, as in the production of a normal emulsion composition, an aqueous component that has been heated and mixed in advance is mixed with an oily component that has been heated and mixed in advance, emulsified, and then cooled. 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.

Here, it has been confirmed that in the present emulsion composition, a transparent or translucent emulsion composition may not be obtained by simply mixing the above-mentioned components. This is because the composition contains an oil agent as a component, and emulsification may cause cloudiness. Therefore, it is preferable to carry out high-pressure emulsification treatment. High-pressure emulsification treatment makes it easier to obtain a transparent or translucent composition. However, if a transparent or translucent composition can be obtained by mixing the above-mentioned components, high-pressure emulsification treatment is not necessary.

In one aspect, the present invention relates to a method for producing an oil-in-water emulsion composition, which includes a step of emulsifying a composition containing components (A) to (E) by pressurizing it at a temperature in the range of 20 to 100°C. As a result, as described above, the emulsion composition can have emulsion particles in which a composition containing components (A) to (E) is emulsified by pressurizing it at a temperature in the range of 20 to 100°C. As a result, it is possible to obtain an emulsion composition that is not only significantly improved in transparency and emulsion stability, but also has good compatibility with the skin and a good feel when used without stickiness.

In the production of the present emulsion composition, for example, the components (A) to (E) are heated and mixed to prepare a composition (primary composition), and the composition is then subjected to high-pressure treatment at room temperature or after heating to form the emulsion composition. This makes it possible to obtain a stable emulsion composition with transparency. Preferably, the heated composition is subjected to high-pressure treatment, and then cooled while stirring, so that emulsification proceeds to obtain an emulsion composition. The cooling temperature is preferably room temperature (e.g., 20°C) or lower, and 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.

Specifically, the primary composition is obtained by, for example, mixing components (A) to (E) and other appropriate components with water and heating to prepare a solution. The heating temperature can be, for example, 50 to 95°C, preferably 60 to 90°C, and more preferably 70 to 90°C. At this time, the water-soluble components and oil-soluble components are mixed, and if they are in a heated state in the presence of a surfactant, a homogeneous solution is likely to be 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, heating and high pressure processing can be performed efficiently.

Then, the primary composition is subjected to a normal temperature high pressure treatment or a heated high pressure treatment. The components in the composition are more dispersed by the high pressure treatment, and it becomes easier to obtain a transparent emulsion composition. 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 70 to 150 MPa. When the emulsion composition is heated and high pressure treated, the temperature can be in the range of 20 to 100°C, and specifically, although not limited to this, for example, it is preferably 40 to 90°C, more preferably 50 to 90°C, and even more preferably 60 to 85°C. Furthermore, the temperature and pressure conditions in the heated high pressure treatment are, for example, preferably temperature: 40 to 90°C, pressure: 50 to 250 MPa, and more preferably temperature: 50 to 90°C, pressure: 50 to 150 MPa. As an apparatus for 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, but not limited to, a fluid (composition) may be pressurized and passed through a homogenizing valve, whereby particles are ejected from fine gaps and collide with each other or with an impact ring, or the like, and homogenized by shear forces due to pressure differences. The treatment with a high-pressure homogenizer may be performed, for example, in a continuous manner, rather than in a batch manner. By passing the composition through a high-pressure homogenizer, for example, the particle size of 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 transparent or translucent emulsion composition with excellent emulsion stability.

The composition emulsified by the above-mentioned high-pressure treatment has finer emulsion particles than the composition before the high-pressure treatment. This results in an emulsion composition that is transparent and stable over time.

The emulsion composition obtained above can be used as it is as an emulsion cosmetic, or can be used to obtain a final emulsion cosmetic by adding appropriate components. The emulsion composition is stabilized, and the emulsion does not easily collapse even when appropriate components are added. The emulsion composition can also maintain transparency even when other components are added. Examples of the components to be added include the components described above, and may be, for example, oil-based components, aqueous components, powders, etc. The emulsion particles present in the emulsion composition can continue to exist in the final emulsion cosmetic. The final emulsion cosmetic contains the present emulsion composition. When components 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. The emulsion composition and emulsion cosmetic obtained in this way can be excellent in stability and transparency.

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.

Examples 1 to 19, Comparative Examples 1 to 9
Tables 1 and 2 show the components of the emulsion cosmetics (specifically, lotions) of Examples 1 to 19 and Comparative Examples 1 to 9, as well as the amounts (mass%) of the components, and the evaluation results of transparency (light transmittance), emulsion stability, usability, etc.

The examples and comparative examples shown in Tables 1 and 2 were produced by the following methods.
Production Method of Examples 1 to 19 A. Components (A), (B), (C), (D), and (E) were dissolved in water with heating 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 immediately before pressurization was set to 70°C (Examples 1 to 17), 25°C (Example 18), or 50°C (Example 19), 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 an emulsion cosmetic of each example.

Manufacturing Methods of Comparative Examples 1 to 9 Comparative Example 1 was manufactured in the same manner as Example 1, except that component (A) was not blended (the same amount was replaced with purified water), to obtain an emulsion cosmetic.
In Comparative Example 2, an emulsion cosmetic was obtained in the same manner as in Example 1, except that sodium dilauroyl glutamate lysine was blended instead of component (A). Note that sodium dilauroyl glutamate lysine is a gemini type surfactant, and is known to have high surface activity.
In Comparative Example 3, an emulsion cosmetic was obtained in the same manner as in Example 1, except that component (B) was not added (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 emulsion cosmetic 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 polyglyceryl-10 laurate was used instead of component (C).
In Comparative Example 7, an emulsion cosmetic was obtained in the same manner as in Example 1, except that component (D) was not added (the same amount was replaced with purified water).
In Comparative Example 8, an emulsion cosmetic was obtained by producing in the same manner as in Example 1, except that component (E) was not blended (the same amount was replaced with purified water).
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. The emulsion cosmetic of Comparative Example 9 was cloudy and opaque (neither translucent nor transparent).

Evaluation The emulsion cosmetics of Examples 1 to 19 and Comparative Examples 1 to 9 shown in Tables 1 and 2 were evaluated by the following methods.

Transparency: Light transmittance during manufacture The transmittance of each sample of the Examples and Comparative Examples was measured using a spectrophotometer (GeneQuant 1300, manufactured by BioChrom) with light having a wavelength of 700 nm, and evaluated according to the following criteria.
◎: Light transmittance is 80% or more and 100% or less. ○: Light transmittance is 50% or more and less than 80%. ×: Light transmittance is less than 50%.

Light transmittance after storage 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 sample was measured for transmittance at a wavelength of 700 nm using a spectrophotometer (GeneQuant 1300, manufactured by BioChrom) and evaluated according to the following criteria.
◎: Light transmittance is 80% or more and 100% or less. ○: Light transmittance is 50% or more and less than 80%. ×: Light transmittance is less than 50%.

Emulsion stability (stability of the formulation over time)
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, but does not disappear when mixed ×: Significant separation

Usability (skin compatibility, no stickiness after application)
A panel of 20 experts conducted a usage test on each sample of the Examples and Comparative Examples, and evaluated the usability of the sample. Specifically, the cosmetic was applied to the forearm, and two items (skin compatibility and non-stickiness of the skin after application) were evaluated based on the questionnaire results (select one of good, normal, slightly bad, and bad) according to the following criteria.
◎: 15 or more out of 20 people answered that it was good. ○: 10 to 14 out of 20 people answered that it was good. △: 5 to 9 out of 20 people answered that it was good. ×: 0 to 4 out of 20 people answered that it was good.

Results Examples 1 to 19 containing components (A) to (E) were excellent in transparency, good in stability, and good in usability (skin compatibility, non-stickiness on the skin after use). On the other hand, Comparative Examples 1 to 9 were rated x in at least one evaluation item. In particular, the results of Comparative Example 2 suggested that a transparent or translucent emulsion cosmetic is not obtained simply by using a surfactant with high surface activity, and that sodium surfactin of component (A) is advantageous. Furthermore, the results of Comparative Example 9 suggested that a transparent or translucent emulsion cosmetic may not be obtained even if components (A) to (E) are blended, and that the dispersibility of emulsion particles is important. When the particle sizes of the emulsions of Example 1 and Comparative Example 9 were measured and compared, the particle size of Example 1 was 200 nm or less, whereas the particle size of Comparative Example 9 was 1 μm (1000 nm) or more.

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 (mass%), and the "remaining amount" refers to the amount that makes the total amount 100 mass%. The light transmittance was measured using a spectrophotometer (GeneQuant 1300, manufactured by BioChrom) with light of a wavelength of 700 nm.

Formulation Example 1: Oil-in-water lotion (Ingredients) (Content)
1. Sodium surfactin (ingredient A) 0.08%
2. Squalane (ingredient B) 1.0%
3. Polyoxyethylene polyoxypropylene decyl tetradecyl ether (Component C)
0.4%
4. Polyoxyethylene polyoxypropylene cetyl ether (ingredient C) 0.4%
5. Sodium stearoyl glutamate (ingredient D) 0.1%
6. Glycerin (ingredient E) 20.0%
7. 1,3-butylene glycol (ingredient E) 10.0%
8. EDTA-2Na 0.1%
9. Purified water remaining 10. L-ascorbic acid 2-glucoside 2.0%
11. Phenoxyethanol 0.2%
12. Ethylhexylglycerin (*1) 0.1%
13. Jasmine flower extract, edelweiss extract, mallow extract, vitamin E acetate, theanine, organic peppermint extract mixture (beauty ingredient mixture)
1.0%
14. Ethanol 2.0%
15. Fragrance: 0.1%
(*1) ADEKA NOL GE-RF (manufactured by ADEKA Chemical Supply Co., Ltd.)

(Production method)
A. Composition 1 was obtained by heating and dissolving components 1 to 8 and 50.0% of component 9 (of the total amount in 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 50°C to 80°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 mixture was cooled to a temperature of 15° C. or lower to obtain emulsion composition 2 as a transparent or translucent emulsion composition.
D. The remainder of component 9 and components 10 to 15 were mixed into the above emulsion composition 2.
E. The above mixture was defoamed to obtain an oil-in-water lotion.

The cosmetic of formulation example 1 was transparent or translucent. In addition, in the above-mentioned emulsion composition 2, when this emulsion composition 2 is taken as the total amount (100%), the content of component (A) was 0.10%, the content of component (B) was 1.22%, (C)/(D) = 8.0 (mass ratio), (C) + (D) = 1.10%.

Formulation Example 2: Oil-in-water serum 1
(Ingredients) (Content)
1. Sodium surfactin (ingredient A) 0.08%
2. Jojoba seed oil (ingredient B) 3.5%
3. Meadowfoam oil (ingredient B) 1.0%
4. Macadamia seed oil (ingredient B) 0.5%
5. Cetyl ethylhexanoate (ingredient B) 1.5%
6. Polyoxyethylene polyoxypropylene cetyl ether (ingredient C) 2.0%
7. Polyoxyethylene (20EO) hydrogenated castor oil (ingredient C) 1.0%
8. Sodium stearoyl glutamate (ingredient D) 0.08%
9. Glycerin (ingredient E) 15.0%
10. 1,3-butylene glycol (ingredient E) 10.0%
11. EDTA-2Na 0.1%
12. Sodium phosphate 0.1%
13. Disodium phosphate 0.1%
14. Sodium hydroxide 0.005%
15. Purified water remaining 16. Tranexamic acid 2.0%
17. Phenoxyethanol 0.3%
18. Mixture of jasmine flower extract, grape leaf extract, peppermint leaf extract, bifidobacterium culture lysate, prunus satoensis flower extract, polyquaternium-51, rosa multiflora fruit extract, rugosa rose 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, maltose aceroides fruit extract, acetyl glutamic acid, theanine, glycine, hydrolyzed hyaluronic acid, and sodium hyaluronate (mixture of beauty ingredients)
1.0%
19. Ethanol 1.0%
20. Fragrance: 0.4%

(Production method)
A. Composition 1 was obtained by dissolving 50.0% (of the total amount in the formulation example) of components 1 to 10 and component 15 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 50°C to 80°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 mixture was cooled to a temperature of 15° C. or lower to obtain emulsion composition 2 as a transparent or translucent emulsion composition.
D. Components 11 to 14, the remainder of component 15, and components 16 to 20 were mixed into the above emulsion composition 2.
E. The above mixture was degassed to obtain oil-in-water cosmetic serum 1.

The cosmetic of formulation example 2 was transparent or translucent. In addition, in the above emulsion composition 2, when this emulsion composition 2 is taken as the total amount (100%), the content of component (A) was 0.09%, the content of component (B) was 7.68%, (C)/(D) = 37.5 (mass ratio), (C) + (D) = 3.64%.

Formulation Example 3: Oil-in-water serum 2
(Ingredients) (Content)
1. Sodium surfactin (ingredient A) 0.08%
2. Squalane (ingredient B) 2.0%
3. Trimethylolpropane triisostearate (component B) 1.0%
4. Pentaerythrityl tetraethylhexanoate (component B) 1.0%
5. Polyoxyethylene polyoxypropylene cetyl ether (ingredient C) 1.0%
6. Polyoxyethylene isostearate (50 EO) hydrogenated castor oil (component C)
1.0%
7. Sodium stearoyl methyl taurate (ingredient D) 0.04%
8. Glycerin (ingredient E) 10.0%
9. 1,3-butylene glycol (ingredient E) 10.0%
10. Purified water remaining 11. Phenoxyethanol 0.3%
12. Xanthan gum 0.02%
13. (Acrylates/C10-30 alkyl acrylate) crosspolymer
0.02%
14. Sodium hydroxide 0.06%
15. Caramel 0.02%
16. Mixture of hydrolyzed conchiolin solution, gentiana 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, Hitori Shizu extract, Asparagus extract, Artemia extract, Guava extract, Coffee extract, Taiso extract, Grape leaf extract, and Sanguisorba officinalis extract (mixture of beauty ingredients)
1.0%
17. Ethanol 5.0%
18. L-Menthol 0.01%
19. Fragrance: 0.2%

(Production method)
A. Composition 1 was obtained by heating and dissolving components 1 to 8, 5.0% of component 9 (of the total amount of the formulation example), and 50.0% 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 50°C to 80°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 mixture was cooled to a temperature of 15° C. or lower to obtain emulsion composition 2 as a transparent or translucent emulsion composition.
D. The remainder of component 9, the remainder of component 10, and components 11 to 19 were mixed into the above emulsion composition 2.
E. The above mixture was degassed to obtain oil-in-water cosmetic serum 2.

The cosmetic of formulation example 3 was transparent or translucent. In addition, in the above-mentioned emulsion composition 2, when this emulsion composition 2 is taken as the total amount (100%), the content of component (A) was 0.11%, the content of component (B) was 5.62%, (C)/(D) was 50.0 (mass ratio), and (C)+(D) was 2.87%.

Formulation Example 4: Oil-in-water emulsion (Components) (Contents)
1. Sodium surfactin (ingredient A) 0.08%
2. Propylene glycol dicaprylate (ingredient B) 3.0%
3. Trimethylolpropane triisostearate (component B) 2.0%
4. Pentaerythrityl tetraethylhexanoate (component B) 2.0%
5. Ethyl oleate (ingredient B) 0.5%
6. Polyoxyethylene polyoxypropylene decyl tetradecyl ether (component C)
1.0%
7. Polyoxyethylene isostearate (50 EO) hydrogenated castor oil (component C)
1.5%
8. Polysorbate 80 (ingredient C) 0.05%
9. Sodium stearoyl methyl taurate (ingredient D) 0.1%
10. Glycerin (ingredient E) 10.0%
11. 1,3-butylene glycol (ingredient E) 15.0%
12. Purified water remaining 13. Stearic acid 0.8%
14. Glyceryl stearate 0.2%
15. Sorbitan oleate 0.02%
16. Cetearyl alcohol 0.4%
17. Behenyl alcohol 0.2%
18. Isohexadecane 0.2%
19. (Sodium acrylate/sodium acryloyldimethyltaurate) copolymer
0.4%
20. TEA 0.6%
21. Carbomer 0.02%
22. Silica (*2) 2.0%
23. Phenoxyethanol 0.3%
24. Mixture of Elderberry Flower Extract, Tea Leaf Extract, Tea Extract, Jasminum Sambac Flower Extract, Polyquaternium-51, Rosa Multiflora Fruit Extract, Rugosa Rusca 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. Caramel 0.02%
26. Ethanol 5.0%
27. Fragrance: 0.2%
(*2) God Ball D-11 796C (manufactured by Suzuki Oil Industries Co., Ltd.)

(Production method)
A. Composition 1 was obtained by heating and dissolving components 1 to 10, 10.0% of component 11 (of the total amount of the formulation example), and 40.0% of component 12 (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 50°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 mixture was cooled to a temperature of 15° C. or lower to obtain emulsion composition 2 as a transparent or translucent emulsion composition.
D. Ingredients 13 to 19 and 22 were heated to 80° C. and mixed to obtain mixture 1.
E. Ingredients 20 and 21, the remainder of ingredient 11, and the remainder of ingredient 12 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 and ingredients 23-27 at room temperature.
H. The above mixture was defoamed to obtain an oil-in-water emulsion.

In Formulation Example 4, when the total amount of emulsion composition 2 is taken as 100%, the content of component (A) is 0.11%, the content of component (B) is 10.7%, (C)/(D) is 25.5 (mass ratio), and (C)+(D) is 3.77%.

Formulation Example 5: Oil-in-water cream (Ingredients) (Content)
1. Sodium surfactin (ingredient A) 0.08%
2. Propylene glycol dicaprylate (ingredient B) 3.0%
3. Triethylhexanoin (ingredient B) 3.0%
4. Hydrogenated polyisobutene (component B) (*3) 3.0%
5. Polyoxyethylene polyoxypropylene decyl tetradecyl ether (Component C)
1.5%
6. Polyoxyethylene sorbitan monooleate (20EO) (Component C)
1.5%
7. Sodium stearoyl methyl taurate (ingredient D) 0.1%
8. Glycerin (ingredient E) 10.0%
9. 1,3-butylene glycol (ingredient E) 15.0%
10. Purified water remaining 11. Glyceryl stearate 0.2%
12. Cetearyl alcohol 2.0%
13. Behenyl alcohol 2.0%
14. Tocopherol 0.001%
15. Xanthan gum 0.02%
16. Carbomer 0.02%
17. Boron nitride (*4) 1.0%
18. Titanium oxide/silica-coated mica (*5) 1.0%
19. Titanium oxide/iron oxide coated mica (*6) 1.0%
20. Silica (*7) 1.0%
21. Nylon-12 (*8) 0.1%
22. Nicotinamide 5.0%
23. EDTA-2Na 0.04%
24. Phenoxyethanol 0.3%
25. Licorice flavonoid, rosemary leaf extract, apricot kernel oil, rosehip fruit extract, almond oil, and corn oil mixture (mixture of beauty ingredients) 0.3%
26. Sodium hydroxide 0.06%
27. Caramel 0.02%
28. Ethanol 5.0%
29. Fragrance: 0.2%
(*3) Pearleem 6 (manufactured by NOF Corp.)
(*4) CCS102-JA BORON NITRIDE POWDER (manufactured by Momentive Performance Materials Japan, Inc.)
(*5) TIMIRON SPLEMDID RED (Merck)
(*6) TIMICA RADIANT GOLD 222G (Engelhard)
(*7) Sunsphere NP-200 (AGC Si-Tech Co., Ltd.)
(*8) Ganzpearl GM-2800 (manufactured by Nihon Koken Kogyo Co., Ltd.)

(Production method)
A. Composition 1 was obtained by heating and dissolving components 1 to 8, 10.0% of component 9 (of the total amount of the formulation), and 30.0% 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 50°C to 80°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 mixture was cooled to a temperature of 15° C. or lower to obtain emulsion composition 2 as a transparent or translucent emulsion composition.
D. Ingredients 11 to 14 and ingredients 17 to 21 were heated to 80° C. and mixed to obtain mixture 1.
E. Ingredients 15, 16, 26, the remainder of ingredient 9, and the remainder of ingredient 10 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. The above emulsion composition 2 was mixed with composition 3, ingredients 22 to 25, and ingredients 27 to 29 at room temperature.
H. The above mixture was defoamed to obtain an oil-in-water cream.

In Formulation Example 5, when the total amount of emulsion composition 2 is taken as 100%, the content of component (A) is 0.13%, the content of component (B) is 14.5%, (C)/(D) is 30.0 (mass ratio), and (C)+(D) is 4.99%.

Formulation Example 6: Oil-in-water base (Ingredients) (Content)
1. Sodium surfactin (ingredient A) 0.08%
2. Pentaerythrityl tetraethylhexanoate (ingredient B) 0.5%
3. Trimethylolpropane triisostearate (component B) 0.5%
4. Dimethicone (viscosity 6 cs) (ingredient B) 0.5%
5. Polyoxyethylene polyoxypropylene decyl tetradecyl ether (Component C)
1.0%
6. Polyoxyethylene polyoxypropylene cetyl ether (ingredient C) 0.5%
7. Sodium stearoyl glutamate (ingredient D) 0.1%
8. Glycerin (ingredient E) 10.0%
9. 1,3-butylene glycol (ingredient E) 10.0%
10. Purified water remaining 11. Ethylhexyl methoxycinnamate 2.0%
12. Bis-ethylhexyl hexyl benzoate 1.0%
13. Ceterial alcohol 0.5%
14. Polyglyceryl-10 myristate 0.5%
15. Polyglyceryl stearate-10 0.5%
16. Sorbitan sesquistearate 0.3%
17. Propylene glycol di(caprylate/caprate) 3.0%
18. (Acrylates/C10-30 alkyl acrylate) crosspolymer
0.1%
19. Sodium hydroxide 0.1%
20. Xanthan gum 0.1%
21. Mixture of water-soluble collagen, rose centifolia flower extract, royal jelly extract, and orange flower water (mixture of beauty ingredients) 0.3%
22. Ethanol 5.0%
23. Methylparaben 0.1%
24. Titanium oxide treated with 3% aluminum hydroxide (average particle size 0.25 μm) (*9)
1.0%
25. Alumina/stearic acid treated titanium oxide (70.0%)/Nylon-12 (30.0%) (*10) 1.0%
26. Barium sulfate 0.1%
27. Polymethylsilsesquioxane 0.1%
28. Silica (*11) 1.0%
29. Fragrance: 0.2%
(*9) MP-1133 (manufactured by Teika Co., Ltd.)
(*10) MTXO-70NL (Hayate Material Co., Ltd.)
(*11) Silica Microbeads P-1505 (manufactured by JGC Catalysts and Chemicals)

(Production method)
A. Composition 1 was obtained by heating and dissolving components 1 to 8, 5.0% of component 9 (of the total amount of the formulation example), and 50.0% 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 50°C to 80°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 mixture was cooled to a temperature of 15° C. or lower to obtain emulsion composition 2 as a transparent or translucent emulsion composition.
D. Components 11 to 17 and components 24 to 28 were heated and dissolved at 80°C to obtain mixture 1.
E. Ingredients 18 to 20 were mixed with the remainder of ingredient 9 and the remainder of ingredient 10 to obtain mixture 2.
F. Mixture 1 and Mixture 2 were mixed at 75° C. to obtain Composition 3.
G. The above emulsion composition 2 was mixed with composition 3, components 21 to 23, and component 29 at room temperature.
H. The above mixture was degassed to obtain an oil-in-water base.

In Formulation Example 6, when the total amount of emulsion composition 2 is taken as 100%, the content of component (A) is 0.12%, the content of component (B) is 2.20%, (C)/(D) is 15.0 (mass ratio), and (C)+(D) is 2.35%.

Formulation Example 7: Oil-in-water sunscreen 1
(Ingredients) (Content)
1. Sodium surfactin (ingredient A) 0.08%
2. Isotridecyl isononanoate (component B) 0.5%
3. Dimethicone (viscosity 6 cs) (ingredient B) 1.5%
4. Polyoxyethylene polyoxypropylene cetyl ether (ingredient C) 2.0%
5. Polyoxyethylene (20EO) hydrogenated castor oil (ingredient C) 0.1%
6. Polysorbate 60 (ingredient C) 0.3%
7. Polysorbate 80 (ingredient C) 0.1%
8. Sodium stearoyl glutamate (ingredient D) 0.2%
9. Glycerin (ingredient E) 10.0%
10. 1,3-butylene glycol (ingredient E) 10.0%
11. Purified water remaining 12. Ethylhexyl methoxycinnamate 4.0%
13. Polysilicone-15 0.5%
14. Methylene bisbenzotriazolyl tetrabutylphenol 1.0%
15. Neopentyl glycol dicaprylate 0.5%
16. Diphenylsiloxyphenyl trimethicone 0.5%
17. Cyclopentasiloxane 1.0%
18. Acrylates/Dimethicone Copolymer 0.1%
19. Ceterial alcohol 0.5%
20. Stearic acid 0.5%
21. PEG-30 Phytosterol 0.3%
22. Sorbitan oleate 0.1%
23. Methyl glucose sesquistearate 0.2%
24. Glyceryl stearate 0.2%
25. (Sodium acrylate/sodium acryloyldimethyltaurate) copolymer
0.4%
26. Isohexadecane 0.1%
27. (Acrylates/C10-30 alkyl acrylate) crosspolymer
0.1%
28. Carbomer 0.01%
29. Xanthan gum 0.1%
30. TEA 1.0%
31. EDTA-2Na 0.01%
32. Mixture of licorice flavonoids, rosemary leaf extract, apricot kernel oil, rosehip fruit extract, almond oil, and corn oil (mixture of beauty ingredients) 0.3%
33. DL-α-tocopherol acetate 0.01%
34. Ethanol 3.0%
35. Phenoxyethanol 0.2%
36. 0.5% lecithin-treated and 3% aluminum hydroxide-treated titanium dioxide (0.25 μm) 0.5%
37. Dimethicone, aluminum hydroxide, hydrated silica-treated titanium dioxide (average particle size: 0.030 μm) (* 12) 1.0%
38. Titanium oxide/tin oxide coated borosilicate (Ca/Al) (*13)
0.1%
39. Fragrance: 0.4%
(*12) SMT-500SAM (manufactured by Teika Co., Ltd.)
(*13) Microglass Metashine MT1080RS (manufactured by Nippon Sheet Glass Co., Ltd.)

(Production method)
A. Composition 1 was obtained by heating and dissolving components 1 to 9, 5.0% of component 10 (of the total amount of the formulation example), and 45.0% of component 11 (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 50°C to 80°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 mixture was cooled to a temperature of 15° C. or lower to obtain emulsion composition 2 as a transparent or translucent emulsion composition.
D. Ingredients 12 to 26, ingredient 33, and ingredients 36 to 38 were heated to 80° C. and mixed to obtain mixture 1.
E. Components 27 to 31, the remainder of component 10, and the remainder of component 11 were heated and dissolved at 80° C. to obtain mixture 2.
F. The above mixtures 1 and 2 were mixed at 80° C. to obtain composition 3.
G. The above emulsion composition 2 was mixed with composition 3 and ingredients 32, 34, 35, and 39 at room temperature.
H. The above mixture was degassed to give oil-in-water sunscreen 1.

In Formulation Example 7, when the total amount of emulsion composition 2 is taken as 100%, the content of component (A) is 0.12%, the content of component (B) is 3.09%, (C)/(D) is 12.5 (mass ratio), and (C)+(D) is 4.17%.

Formulation Example 8: Oil-in-water sunscreen 2
(Ingredients) (Content)
1. Sodium surfactin (ingredient A) 0.08%
2. Jojoba seed oil (ingredient B) 0.5%
3. Dimethicone (viscosity 6 cs) (ingredient B) 1.5%
4. Triethylhexanoin (ingredient B) 0.5%
5. Ethyl oleate (ingredient B) 0.1%
6. Polyoxyethylene polyoxypropylene decyl tetradecyl ether (component C)
1.2%
7. Polyoxyethylene (20EO) hydrogenated castor oil (ingredient C) 1.5%
8. Polysorbate 80 (ingredient C) 0.3%
9. Sodium stearoyl glutamate (ingredient D) 0.1%
10. Glycerin (ingredient E) 10.0%
11. 1,3-butylene glycol (ingredient E) 10.0%
12. Purified water remaining 13. Ethylhexyl methoxycinnamate 7.0%
14. Dibutyl adipate 1.0%
15. Isododecane 1.0%
16. Hydrogenated polyisobutene (*14) 1.0%
17. Ceterial alcohol 0.2%
18. Behenyl alcohol 0.2%
19. Sorbitan sesquioleate 0.3%
20. Di(C12-15)pareth-8 phosphate 0.1%
21. Polyglyceryl-2 isostearate 0.2%
22. (Acrylates/C10-30 alkyl acrylate) crosspolymer
0.1%
23. Carbomer 0.1%
24. Xanthan gum 0.1%
25. Sodium hydroxide 0.1%
26. Mixture of jasmine flower extract, grape leaf extract, peppermint leaf extract, bifidobacterium culture lysate, prunus satoensis flower extract, polyquaternium-51, rosa multiflora fruit extract, rugosa rose 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, maltophila oleracea fruit extract, acetyl glutamic acid, theanine, glycine, hydrolyzed hyaluronic acid, and sodium hyaluronate (mixture of beauty ingredients)
1.0%
27. Ethanol 3.0%
28. Phenoxyethanol 0.2%
29. Titanium oxide treated with 2% alumina/10% silica (average particle size 0.4 μm) (*15) 0.5%
30. Titanium oxide treated with 3% aluminum hydroxide (average particle size 0.25 μm) (*16)
0.3%
31. Silica (*17) 0.5%
32. Fragrance: 0.2%
(*14) Dedraflow5 (manufactured by CIT Sarl)
(*15) SYMPHOLIGHT WW-E (manufactured by JGC Catalysts and Chemicals)
(*16) TIPAQUE CR-50 (manufactured by Ishihara Sangyo Kaisha)
(*17) God Ball E-90C (manufactured by Suzuki Oil Industries Co., Ltd.)

(Production method)
A. Composition 1 was obtained by heating and dissolving components 1 to 10, 5.0% of component 11 (of the total amount of the formulation example), and 45.0% of component 12 (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 50°C to 80°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 mixture was cooled to a temperature of 15° C. or lower to obtain emulsion composition 2 as a transparent or translucent emulsion composition.
D. Components 13 to 21 and components 29 to 31 were heated and dissolved at 80°C to obtain mixture 1.
E. Ingredients 22-25, the remainder of ingredient 11, and the remainder of ingredient 12 were mixed together to obtain mixture 2.
F. Mixture 1 and Mixture 2 were mixed at 75° C. to obtain Composition 3.
G. The above emulsion composition 2 was mixed with composition 3 and ingredients 26 to 28 and 32 at room temperature.
H. The above mixture was degassed to give oil-in-water sunscreen 2.

In Formulation Example 8, when the total amount of emulsion composition 2 is taken as 100%, the content of component (A) is 0.12%, the content of component (B) is 3.95%, (C)/(D) is 30.0 (mass ratio), and (C)+(D) is 4.71%.

Claims (12)

The following components (A) to (E):
(A) sodium surfactin,
(B) a liquid oil agent;
(C) 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,
(D) an anionic surfactant, and
(E) a polyhydric alcohol,
1. A transparent or translucent oil-in-water emulsion composition comprising: The oil-in-water emulsion composition according to claim 1, which has a light transmittance of 50% or more at a wavelength of 700 nm. The oil-in-water emulsion composition according to claim 1 or 2, wherein the content of component (A) is 0.0001 to 1% by mass based on the total amount of the composition. The oil-in-water emulsion composition according to any one of claims 1 to 3, wherein the content of component (B) is 0.001 to 15 mass% based on the total amount of the composition. The oil-in-water emulsion composition according to any one of claims 1 to 4, wherein the ratio of the contents of component (C) and component (D) ((C)/(D)) is 0.5 to 50 by mass ratio. The oil-in-water emulsion composition according to any one of claims 1 to 5, wherein the total content of component (C) and component (D) is 5 mass% or less based on the total amount of the composition. The oil-in-water emulsion composition according to any one of claims 1 to 6, wherein component (C) is a polyoxyalkylene alkyl ether. The oil-in-water emulsion composition according to any one of claims 1 to 7, wherein component (D) is at least one selected from sodium stearoyl glutamate and sodium methyl stearoyl taurate. The oil-in-water emulsion composition according to any one of claims 1 to 8, wherein component (E) is one or more selected from glycerin and 1,3-butylene glycol. The oil-in-water emulsion composition according to any one of claims 1 to 9, wherein the composition containing components (A) to (E) has emulsion particles emulsified by pressurization in the range of 20 to 100°C. An oil-in-water emulsion cosmetic comprising the oil-in-water emulsion composition according to any one of claims 1 to 10. A method for producing the oil-in-water emulsion composition according to any one of claims 1 to 11, comprising the step of emulsifying a composition containing components (A) to (E) by pressurizing it in the range of 20 to 100°C.