Oil-in-water emulsion composition and method for treating hair and / or skin

Abstract

To provide an oil-in-water emulsion composition excellent in dispersion stability of an oily component and also provide a method for treating hair and / or skin using the oil-in-water emulsion composition having excellent oily component dispersibility.SOLUTION: Provided is an oil-in-water emulsion composition, which is a mixture of: an oily component; polyoxyethylene sorbitol tetraoleate with an average addition mole number of ethylene oxide of 10 or more and / or polyoxyethylene sorbitol tetraisostearate having an average addition mole number of ethylene oxide of 10 or more; and one or two or more selected from polyoxyethylene polyoxypropylene decyltetradecyl ether, polyoxyethylene phytosterol, polyoxyethylene hydrogenated castor oil with an average addition mole number of ethylene oxide of 10 or more, polyglyceryl decaoleate, polyoxyethylene glyceryl triisostearate, and polyoxyethylene cetyl ether. Also provided is a method for treating hair and / or skin, which uses this oil-in-water emulsion composition.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an oil-in-water emulsion composition and a method for treating hair and / or skin. [Background technology]

[0002] Oil-in-water emulsion compositions containing oily ingredients such as ester oils, fats and oils, hydrocarbons, higher alcohols, and silicones are used in methods for treating hair and skin. The oily ingredients are emulsified and dispersed in water, and a technique for improving the stability of this dispersion is desirable from the viewpoint of the quality stability of the oil-in-water emulsion compositions.

[0003] Patent Document 1 discloses an oil-in-water emulsion composition that contains a polyoxyethylene sorbite fatty acid ester with an HLB value of 10 to 15 and polyoxyethylene hydrogenated castor oil with an HLB value of 3 to 6, with the main oil component being an oil commonly used in cosmetics, in order to improve the emulsion dispersion stability of this oil component (see claim 1, paragraph 0006, etc.).As disclosed in Patent Document 1, improvement in the dispersion stability of oil components is desired. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-92021 Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above circumstances, an object of the present invention is to provide an oil-in-water emulsion composition that exhibits excellent dispersion stability of an oily component, and a method for treating hair and / or skin that uses the oil-in-water emulsion composition that exhibits excellent dispersibility of an oily component. [Means for solving the problem]

[0006] As a result of extensive research, the present inventors have found that the use of two or more specific nonionic surfactants in combination provides excellent dispersion stability of oily components in oil-in-water emulsion compositions, and have completed the present invention.

[0007] That is, the oil-in-water emulsion composition according to the present invention comprises the following components (A), (B), (C), and (D): (A) Oily component (B) Polyoxyethylene sorbitol tetraoleate having an average number of moles of ethylene oxide added of 10 or more and / or polyoxyethylene sorbitol tetraisostearate having an average number of moles of ethylene oxide added of 10 or more (C) one or more selected from polyoxyethylene polyoxypropylene decyl tetradecyl ether, polyoxyethylene phytosterol, polyoxyethylene hydrogenated castor oil having an average number of moles of ethylene oxide added of 10 or more, polyglyceryl decaoleate, polyoxyethylene glyceryl triisostearate, and polyoxyethylene cetyl ether (D)Water

[0008] The oil-in-water emulsion composition of the present invention preferably has a viscosity of 500 mPa·s or less. By setting the viscosity at 500 mPa·s or less, the composition becomes more easily absorbed into hair and skin. Furthermore, the decrease in dispersibility of component (A) that accompanies a lower viscosity can be suppressed by incorporating components (B) and (C).

[0009] In the oil-in-water emulsion composition of the present invention, it is preferable that the volume average particle diameter of the dispersed component (A) is 500 nm or less. This volume average particle diameter can be achieved by blending components (B) and (C), and is suitable for the dispersion stability of component (A).

[0010] The oil-in-water emulsion composition according to the present invention preferably contains the component (A) in an amount of 20% by mass or less, which is favorable for the dispersion stability of the component (A).

[0011] The oil-in-water emulsion composition according to the present invention is preferably used by applying it to hair and / or skin, similar to known oil-in-water emulsion compositions in which an oily component is dispersed.

[0012] Furthermore, the method for treating hair and / or skin according to the present invention uses the oil-in-water emulsion composition according to the present invention, which is applied to hair and / or skin. [Effects of the Invention]

[0013] The oil-in-water emulsion composition of the present invention contains a specific nonionic surfactant in addition to polyoxyethylene sorbitol tetraoleate having an average number of added moles of ethylene oxide of 10 or more and / or polyoxyethylene sorbitol tetraisostearate having an average number of added moles of ethylene oxide of 10 or more, and therefore exhibits excellent dispersion stability of oily components.

[0014] Furthermore, the hair and / or skin treatment method according to the present invention uses an oil-in-water emulsion composition containing polyoxyethylene sorbitol tetraoleate and / or polyoxyethylene sorbitol tetraisostearate having an average number of added moles of ethylene oxide of 10 or more, as well as a specific nonionic surfactant, and therefore can treat hair and / or skin using a composition that has excellent dispersion stability of oily components. DETAILED DESCRIPTION OF THE INVENTION

[0015] The present invention will be described below based on the embodiments of the present invention. The composition according to this embodiment is an oil-in-water emulsion composition containing an oily component (A), specific nonionic surfactants (B) and (C) described below, and water (D). The composition may optionally contain components contained in known hair or skin compositions.

[0016] (Component (A)) In order to realize an oil-in-water emulsion composition, the composition of this embodiment contains an oily component as component (A) that is dispersed in water together with components (B) and (C).

[0017] In this embodiment, component (A) is one or more selected from hydrocarbons, waxes, ester oils, fats and oils, higher alcohols, and silicones. Component (A) is preferably selected from known oily components.

[0018] When a hydrocarbon is blended as component (A), one or more types selected from known hydrocarbons can be blended. Also, hydrocarbons that are liquid at 25° C. and / or hydrocarbons that are solid at 25° C. can be blended as component (A). Examples of such hydrocarbons include hydrogenated polyisobutene, isododecane, (C13-15) alkanes, liquid paraffin, squalane, pristane, ozokerite, paraffin, ceresin, petrolatum, and microcrystalline wax.

[0019] Waxes are classified as esters derived from natural products, and generally correspond to esters of fatty acids and water-insoluble higher monohydric or dihydric alcohols. When wax is used as component (A), one or more types of known waxes can be used. Examples of such waxes include beeswax, Japan wax, jojoba oil, candelilla wax, rice bran wax, and carnauba wax.

[0020] Ester oils are classified as synthetic esters. When ester oils are used as component (A), one or more types of known ester oils can be used. Also, ester oils that are liquid at 25°C and / or ester oils that are solid at 25°C can be used as component (A). These ester oils include ethyl oleate, isopropyl myristate, isopropyl palmitate, butyl stearate, cetyl palmitate, myristyl myristate, octyldodecyl myristate, isopropyl isostearate, ethyl isostearate, cetyl 2-ethylhexanoate, hexyl isostearate, ethylene glycol di-2-ethylhexanoate, ethylene glycol dioleate, propylene glycol dicaprylate-dicaprate, propylene glycol dioleate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexanoate, isocetyl isostearate, 2-octyldodecyl dimethyloctanoate, myristyl lactate, trioctyldodecyl citrate, diisostearyl malate, di-2-ethylhexyl succinate, diisobutyl adipate, cholesteryl stearate, isotridecyl isononanoate, and coco-caprylate / caprate.

[0021] The oil or fat is one whose main component is a triester of fatty acid and glycerin. When an oil or fat is blended as component (A), one or more types selected from known oils or fats can be blended. Furthermore, an oil or fat that is liquid at 25°C and / or an oil or fat that is solid at 25°C can be blended as component (A). Examples of such oils or fats include almond oil, avocado oil, olive oil, shea butter, shea butter oil, evening primrose oil, passionflower seed oil, camellia oil, babassu oil, peanut oil, sunflower seed oil, and rosehip oil.

[0022] The higher alcohol is a monohydric alcohol having 12 or more carbon atoms. When a higher alcohol is blended as component (A), one or more types selected from known higher alcohols can be blended. Furthermore, a higher alcohol that is liquid at 25°C and / or a higher alcohol that is solid at 25°C can be blended as component (A). Examples of such higher alcohols include lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, octyldodecanol, isostearyl alcohol, and oleyl alcohol.

[0023] When silicone is used as component (A), one or more types selected from known silicones can be used, such as dimethyl silicone (methyl polysiloxane, highly polymerized methyl polysiloxane, etc.), methyl phenyl silicone, cyclic silicone (octamethyl cyclotetrasiloxane, decamethyl cyclopentasiloxane, etc.), amino-modified silicone (aminoethyl aminopropyl siloxane-dimethyl siloxane copolymer, aminoethyl aminopropyl methyl siloxane-dimethyl siloxane copolymer, etc.), long-chain alkyl-modified silicone, and dimethiconol.

[0024] The amount of component (A) in the composition of this embodiment is preferably from 1 to 20% by mass, more preferably from 2 to 15% by mass, more preferably from 3 to 10% by mass, and even more preferably from 3 to 8% by mass. A blending amount of 1% by mass or more is suitable for imparting a tactile feel to hair and skin with component (A), and a blending amount of 20% by mass or less is suitable for preventing a decrease in dispersibility of component (A) even when the viscosity of the composition of this embodiment is set low.

[0025] Furthermore, in the composition of this embodiment, in order to further improve the dispersion stability of component (A), the ratio (a / (b+c)) of the amount of component (A) to the total amount of components (B) and (C) is preferably no greater than 8, more preferably no greater than 6, more preferably no greater than 4, and even more preferably no greater than 3. The lower limit of a / (b+c) is not particularly limited, but is, for example, 0.3.

[0026] ((B) component) In order to enhance the dispersion stability of component (A), the composition of this embodiment contains component (C) and component (B), which are polyoxyethylene sorbit tetraoleate having an average number of added moles of ethylene oxide of 10 or more, polyoxyethylene sorbit tetraisostearate having an average number of added moles of ethylene oxide of 10 or more, or polyoxyethylene sorbit tetraoleate having an average number of added moles of ethylene oxide of 10 or more and polyoxyethylene sorbit tetraisostearate having an average number of added moles of ethylene oxide of 10 or more (hereinafter, "polyoxyethylene" may be referred to as "POE").

[0027] The POE sorbitol tetraoleate, component (B), is a tetraester of oleic acid and sorbitol obtained by addition polymerization of ethylene oxide, and examples thereof include POE sorbitol tetraoleate (30 E.O.), POE sorbitol tetraoleate (40 E.O.), and POE sorbitol tetraoleate (60 E.O.) (the number before "EO" represents the average added moles of ethylene oxide; the same applies below.) The average added moles of ethylene oxide in this POE sorbitol tetraoleate is 10 or more, preferably 20 or more, and more preferably 30 or more. The upper limit of the average added moles is, for example, 60.

[0028] The POE sorbitol tetraisostearate, component (B), is a tetraester of sorbitol obtained by addition polymerization of isostearic acid and ethylene oxide, and examples thereof include POE sorbitol tetraisostearate (20 E.O.), POE sorbitol tetraisostearate (30 E.O.), POE sorbitol tetraisostearate (40 E.O.), and POE sorbitol tetraisostearate (50 E.O.). The average number of moles of ethylene oxide added in this POE sorbitol tetraisostearate is 10 or more, preferably 20 or more, and more preferably 30 or more. The upper limit of the average number of moles added is, for example, 60.

[0029] The amount of component (B) in the composition of this embodiment is preferably 0.5% by mass to 10% by mass, more preferably 1.0% by mass to 5% by mass, and even more preferably 1.5% by mass to 4% by mass. An amount of 0.5% by mass or more is favorable for the dispersion stability of component (A), and an amount of 10% by mass or less is favorable for preventing stickiness of hair and skin to which the composition of this embodiment is applied.

[0030] ((C) component) To enhance the dispersion stability of component (A), the composition of this embodiment contains component (B) and one or more selected from the group consisting of polyoxyethylene polyoxypropylene decyl tetradecyl ether (hereinafter, "polyoxyethylene polyoxypropylene" may be referred to as "POE·POP"), POE phytosterol, POE hydrogenated castor oil having an average number of ethylene oxide moles added of 10 or more, polyglyceryl decaoleate, POE glyceryl triisostearate, and POE cetyl ether. The amount of component (C) in the composition of this embodiment is preferably 0.3% to 7% by mass, more preferably 0.5% to 5% by mass, and even more preferably 1.0% to 3% by mass. A content of 0.3% by mass or more is favorable for improving the dispersion stability of component (A), and a content of 10% by mass or less is favorable for suppressing stickiness on the hair and skin to which the composition of this embodiment is applied.

[0031] POE·POP decyl tetradecyl ether, the above-mentioned component (C), is obtained by addition polymerization of ethylene oxide and propylene oxide to decyltetradecanol, and examples thereof include POE·POP decyl tetradecyl ether (12 E.O.) (6 P.O.), POE·POP decyl tetradecyl ether (20 E.O.) (6 P.O.), POE·POP decyl tetradecyl ether (30 E.O.) (6 P.O.), POE·POP decyl tetradecyl ether (24 E.O.) (13 P.O.), and POE·POP decyl tetradecyl ether (10 E.O.) (20 P.O.) (The number before "EO" indicates the average number of moles of ethylene oxide added, and the number before "PO" indicates the average number of moles of propylene oxide added; the same applies below.). In this POE·POP decyl tetradecyl ether, the average number of moles of ethylene oxide added is preferably 10 or more, with the upper limit of the average number of moles of ethylene oxide being, for example, 30, and the average number of moles of propylene oxide added is preferably 5 or more, with the upper limit of the average number of moles of propylene oxide being, for example, 20.

[0032] The POE phytosterol, component (C), is a polyethylene glycol ether of a sterol obtained from a plant, and examples thereof include POE phytosterol (5 E.O.), POE phytosterol (10 E.O.), POE phytosterol (20 E.O.), and POE phytosterol (30 E.O.). In this POE phytosterol, the average number of moles of ethylene oxide added is preferably 5 or more, and the upper limit of the average number of moles added is, for example, 30.

[0033] The POE hydrogenated castor oil, component (C), is a polyethylene glycol ether of hydrogenated castor oil, and has an average number of moles of ethylene oxide added of 10 or more. Examples of this POE hydrogenated castor oil include POE hydrogenated castor oil (10 E.O.), POE hydrogenated castor oil (20 E.O.), POE hydrogenated castor oil (30 E.O.), POE hydrogenated castor oil (40 E.O.), Examples include POE hydrogenated castor oil (50 E.O.), POE hydrogenated castor oil (60 E.O.), and POE hydrogenated castor oil (80 E.O.). The upper limit of the average number of moles of ethylene oxide added in the POE hydrogenated castor oil is, for example, 80.

[0034] The polyglyceryl decaoleate, component (C), is a decaester of oleic acid and polyglycerin, such as polyglyceryl decaoleate-10. The average number of moles of glycerin added in this polyglyceryl decaoleate is, for example, 5 or more and 20 or less.

[0035] The POE glyceryl triisostearate, component (C), is a triester of isostearic acid and polyoxyethylene glycerin, and examples thereof include polyoxyethylene glyceryl triisostearate (10 E.O.), polyoxyethylene glyceryl triisostearate (15 E.O.), polyoxyethylene glyceryl triisostearate (20 E.O.), polyoxyethylene glyceryl triisostearate (30 E.O.), polyoxyethylene glyceryl triisostearate (40 E.O.), polyoxyethylene glyceryl triisostearate (50 E.O.), and polyoxyethylene glyceryl triisostearate (60 E.O.). In this POE glyceryl triisostearate, the average number of moles of ethylene oxide added is preferably 10 or more, and the upper limit of the average number of moles of ethylene oxide added is, for example, 30.

[0036] The POE cetyl ether, component (C), is a polyethylene glycol ether of cetanol, and examples thereof include POE cetyl ether (10 E.O.), POE cetyl ether (15 E.O.), POE cetyl ether (20 E.O.), POE cetyl ether (23 E.O.), POE cetyl ether (25 E.O.), POE cetyl ether (30 E.O.), and POE cetyl ether (40 E.O.). In this POE cetyl ether, the average number of moles of ethylene oxide added is preferably 10 or more, and the upper limit of the average number of moles of ethylene oxide added is, for example, 40.

[0037] The composition of this embodiment preferably contains, among the component (C), POE·POP decyl tetradecyl ether, POE phytosterol, or POE·POP decyl tetradecyl ether and POE phytosterol. This blending ratio ensures excellent dispersion stability of component (A) even when the composition of this embodiment is left at temperatures exceeding room temperature (25 to 30°C). When POE·POP decyl tetradecyl ether and / or POE phytosterol are blended, the total amount of POE·POP decyl tetradecyl ether and / or POE phytosterol blended is preferably 0.3% to 7% by mass, more preferably 0.5% to 5% by mass, and more preferably 1.0% to 3% by mass. A content of 0.3% by mass or more is favorable for maintaining dispersion stability of component (A), while a content of 10% by mass or less is favorable for suppressing stickiness of hair and skin to which the composition of this embodiment is applied.

[0038] ((D) component) The composition of this embodiment contains water as component (D) to achieve an oil-in-water emulsion composition. If it is desired to keep the viscosity of the composition low, the amount of component (D) in the composition of this embodiment is preferably 60% by mass or more, preferably 75% by mass or more, more preferably 70% by mass or more, and even more preferably 75% by mass or more.

[0039] (optional ingredient) The composition of the present embodiment may contain the above-described optional components, such as cationic surfactants, polyhydric alcohols, sugars, polymeric compounds, amino acids, animal and plant extracts, inorganic compounds, fragrances, preservatives, sequestering agents, and ultraviolet absorbers.

[0040] (Dosage form) The formulation of the composition of this embodiment is not particularly limited as long as it is an oil-in-water emulsion composition, but may be, for example, a liquid. Even if it is a liquid formulation, the dispersion stability of component (A) is excellent. When the composition of this embodiment is a liquid, it may be applied to hair or skin in the form of a mist when used.

[0041] A general property of liquid oil-in-water emulsion compositions is that the lower the viscosity, the lower the dispersion stability of the oily component. However, the composition of this embodiment achieves excellent dispersibility because the dispersibility of component (A) is enhanced by components (B) and (C). The viscosity of the composition of this embodiment may be 500 mPa·s or less, 100 mPa·s or less, 30 mPa·s or less, or 10 mPa·s or less. The viscosity was measured using a Thermo Scientific HAAKE MARS 40 rheometer manufactured by Thermo Fisher Scientific in steady flow curve mode at a shear rate (dγ / dt) of 50 s -1 The value of η (mPa·s) was adopted under the conditions of a cone-plate sensor (diameter 35 mm, tilt angle 2°) and a temperature of 25°C.

[0042] Furthermore, since the composition of this embodiment is an oil-in-water emulsion composition, component (A) is dispersed therein. The volume-average particle diameter of this dispersed component (A) is reduced by the incorporation of components (B) and (C). To enhance the dispersion stability of component (A), it is preferably 500 nm or less, more preferably 300 nm or less, and even more preferably 100 nm or less (the lower limit of the volume-average particle diameter is, for example, 30 nm). Here, the volume-average particle diameter is a value measured by dynamic light scattering, and can be measured using, for example, a measuring device "ELSZ-2000ZS" manufactured by Taiyo Denshi Co., Ltd. Note that, in order to reduce the volume-average particle diameter of component (A), for example, the amount of components (B) and (C) incorporated can be increased.

[0043] (pH) The pH of the composition of this embodiment is not particularly limited, but is, for example, 3.0 or more and 7.5 or less.

[0044] (Application) The composition of this embodiment is used by applying it to hair, skin, or both hair and skin. During use, the dispersion stability of component (A) is increased by the incorporation of components (B) and (C), and changes in particle size of component (A) after storage of the composition are suppressed, so the quality of the composition, such as its feel, is stable. [Example]

[0045] The present invention will be described in detail below based on examples, but the present invention should not be construed as being limited by the descriptions in these examples.

[0046] Liquid oil-in-water emulsion compositions of Examples and oil-in-water emulsion compositions of Comparative Examples were produced, and their viscosities and volume-average particle diameters were measured, and their stability was confirmed.

[0047] (Oil-in-water emulsion composition) Liquid oil-in-water emulsion compositions of the examples and oil-in-water emulsion compositions of the comparative examples were produced using POE sorbitol tetraoleate (30 E.O.), POE sorbitol tetraoleate (6 E.O.), POE·POP decyl tetradecyl ether (30 E.O.) (6 P.O.), POE·POP decyl tetradecyl ether (20 E.O.) (6 P.O.), POE phytosterol (10 E.O.), POE hydrogenated castor oil (30 E.O.), polyglyceryl-10 decaoleate, POE cetyl ether (10 E.O.), POE lauryl ether (5 E.O.), 2-ethylhexyl isononanoate, squalane, apricot kernel oil, 2-ethylhexyl palmitate, coco-caprylate / coco-caprate, phenoxyethanol, isopentyldiol, fragrance, and water. The components used and their amounts are shown in the following Tables 1-1, 1-2 and 2. In the following tables, "balance" means the amount that makes the total amount of the produced composition 100% by mass.

[0048] The oil-in-water emulsion compositions of the Examples and Comparative Examples were produced by adding a mixed solution of isopentyldiol and water at about 60°C to a mixed solution of components other than isopentyldiol and water at about 60°C while stirring, and then cooling to room temperature.

[0049] (viscosity) The viscosity of the oil-in-water emulsion compositions of the Examples and Comparative Examples was measured. In this measurement, a Thermo Scientific HAAKE MARS 40 rheometer manufactured by Thermo Fisher Scientific was used in a steady flow curve mode at a shear rate (dγ / dt) of 50 s -1 The value of η (mPa·s) was adopted under the conditions of a cone-plate sensor (diameter 35 mm, tilt angle 2°) and a temperature of 25°C.

[0050] (Volume average particle size) The volume average particle diameters of particles dispersed in the oil-in-water emulsion compositions of the Examples and Comparative Examples were measured by dynamic light scattering using a measuring device "ELSZ-2000ZS" manufactured by Taiyo Denshi Co., Ltd.

[0051] (stability) The oil-in-water emulsion compositions of the Examples and Comparative Examples were left to stand for 15 days at 25°C and 15 days at 50°C, and the dispersion stability of the oily component (A) was evaluated by visually checking for any changes and separation of the oil and water phases. When left to stand, the oil-in-water emulsion compositions were placed in transparent PET resin bottle containers (diameter: 40 mm, height: 114 mm).

[0052] Tables 1-1, 1-2 and 2 below show the components and the amounts of the components used in producing the oil-in-water emulsion compositions of the Examples and Comparative Examples, as well as the measurement results of viscosity and volume average particle size, and the evaluation results of stability.

[0053] [Table 1-1]

[0054] [Table 1-2]

[0055] In the stability tests carried out at 25°C in Tables 1-1 and 1-2, there was no change in Examples 1a to 1g, which contained components (B) and (C), while separation was observed in Comparative Examples 1a to 1i, which did not contain components (B) and / or (C). Furthermore, there was no change in the stability tests carried out at 50°C in Examples 1a to 1d, which contained POE·POP decyl tetradecyl ether or POE phytosterol as component (C), demonstrating superior stability.

[0056] [Table 2]

[0057] The stability results at 25°C and 50°C in Table 2 above confirm that there was no change regardless of the type of component (A).

Claims

1. An oil-in-water emulsion composition comprising the following components (A), (B), (C), and (D), which is applied to hair and / or skin: (A) Oily component (B) Polyoxyethylene sorbitol tetraoleate having an average number of moles of ethylene oxide added of 10 or more and / or polyoxyethylene sorbitol tetraisostearate having an average number of moles of ethylene oxide added of 10 or more (C) one or more selected from polyoxyethylene polyoxypropylene decyl tetradecyl ether, polyoxyethylene phytosterol, polyglyceryl decaoleate, polyoxyethylene glyceryl triisostearate, and polyoxyethylene cetyl ether (D) Water

2. 2. The oil-in-water emulsion composition according to claim 1, which has a viscosity of 500 mPa·s or less.

3. 3. The oil-in-water emulsion composition according to claim 1, wherein the dispersed component (A) has a volume average particle size of 500 nm or less.

4. 4. The oil-in-water emulsion composition according to claim 1, wherein the blending amount of the component (A) is 20% by mass or less.

5. The oil-in-water emulsion composition according to any one of claims 1 to 4, wherein the ratio (a / (b+c)) of the amount of component (A) to the total amount of component (B) and component (C) is 8 or less.

6. A method for treating hair and / or skin, which uses the oil-in-water emulsion composition according to claim 5.

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