Oil-in-water emulsified cosmetics

Abstract

Provides an oil-in-water emulsified cosmetic with excellent emulsification stability and a disintegration feeling as a feeling of use. The oil-in-water emulsified cosmetic disclosed herein contains: a dispersion medium containing water; and oil droplets dispersed in the dispersion medium, the oil droplets containing oil, a straight-chain higher fatty acid having 16 or more carbon atoms, a monohydric higher alcohol, and a nonionic surfactant, the oil containing at least one selected from a polar oil having an IOB of 0.10 or more and an ultraviolet absorber having an IOB of 0.10 or more, and the viscosity (V) measured at 0.6 rpm using a B-type viscometer in an atmosphere of 30°C. 0.6rpm ) and the viscosity measured at 12 rpm (V 12rpm ) viscosity ratio (V 0.6rpm / V 12rpm ) is 7.9 or above.

Description

Technical Field

[0001] The present disclosure relates to an oil-in-water emulsified cosmetic. Background Art

[0002] In recent years, oil-in-water emulsified cosmetics have been developed that have emulsion stability and exhibit various sensations during use.

[0003] Patent Document 1 discloses an emulsified composition which is prepared by mixing (a) 0.01 to 5 wt % of a polysiloxane-polyoxyalkylene copolymer, (b) 0.05 to 1 wt % of a nonionic surfactant, (c) 10 to 30 wt % of a moisturizer, and (d) 1 to 50 wt % of urea, and which exhibits an excellent moisturizing effect while reducing the irritation of urea and has a very refreshing feeling during use.

[0004] Patent Document 2 discloses an emulsion composition comprising a poorly soluble drug, an oily component comprising two or more higher alcohols, water, and a surfactant, wherein one of the higher alcohols is behenyl alcohol. The emulsion composition has excellent usability and excellent dispersion stability and emulsification stability of the drug.

[0005] Patent Document 3 discloses an emulsified composition having excellent stability, no stickiness and a refreshing feel during use, wherein 0.01 to 5.0% by mass of (A) a polysiloxane-polyoxyalkylene copolymer and 0.05 to 1.0% by mass of (B) a nonionic surfactant or 0.05 to 5.0% by mass of a higher fatty acid having 12 or more carbon atoms are mixed into an emulsified composition containing 0.05 to 50.0% by mass of a glycoside of urea and / or ascorbic acid.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2001-247427

[0009] Patent Document 2: Japanese Patent Application Publication No. 2001-354548

[0010] Patent Document 3: Japanese Patent Application Publication No. 2002-249665 Summary of the invention

[0011] Problems to be solved by the invention

[0012] The emulsified composition constituting the cosmetic contains oil. Among the oil, polar oil has the properties of oil and, on the other hand, has polarity, and therefore has the property of being easily compatible with water compared to non-polar oil. Therefore, the emulsification balance between the water phase and the oil phase is easily destroyed, and it is difficult to improve the emulsification stability of the water-in-oil emulsified cosmetic mixed with the polar oil. Moreover, it is more difficult to adjust the use feeling of the water-in-oil emulsified cosmetic containing such polar oil.

[0013] Therefore, the subject of the present disclosure is to provide an oil-in-water emulsified cosmetic that is excellent in emulsification stability and can exhibit a disintegration feeling as a feeling during use.

[0014] Means for solving problems

[0015] <Scheme 1>

[0016] An oil-in-water emulsified cosmetic comprising:

[0017] a dispersion medium comprising water; and

[0018] Oil droplets dispersed in the above dispersion medium,

[0019] The oil droplets contain oil, a straight-chain higher fatty acid having 16 or more carbon atoms, a monovalent higher alcohol, and a nonionic surfactant.

[0020] The oil component contains at least one selected from polar oils having an IOB of 0.10 or more and ultraviolet absorbers having an IOB of 0.10 or more,

[0021] The viscosity (V 0.6rpm ) and the viscosity measured at 12 rpm (V 12rpm ) viscosity ratio (V 0.6rpm / V 12rpm ) is 7.9 or above.

[0022] <Scheme 2>

[0023] According to the cosmetic of embodiment 1, the mass ratio of the straight-chain higher fatty acid to the monohydric higher alcohol is 0.50 or more.

[0024] <Scheme 3>

[0025] In the cosmetic according to aspect 1 or 2, the straight-chain higher fatty acid, the higher alcohol, and the nonionic surfactant form an interfacial film of the oil droplets in an atmosphere at 25°C.

[0026] <Scheme 4>

[0027] The cosmetic according to any one of aspects 1 to 3, wherein the straight-chain higher fatty acid is at least one selected from stearic acid and behenic acid, and the higher alcohol is at least one selected from cetyl alcohol, isostearyl alcohol, stearyl alcohol, and behenyl alcohol.

[0028] <Scheme 5>

[0029] The cosmetic according to any one of aspects 1 to 4, wherein the at least one selected from the group consisting of a polar oil having an IOB of 0.10 or more and an ultraviolet absorber having an IOB of 0.10 or more is contained in the oil component in an amount of 50% by mass or more.

[0030] <Scheme 6>

[0031] The cosmetic according to any one of aspects 1 to 5, further comprising a dihydric higher alcohol.

[0032] <Scheme 7>

[0033] The cosmetic according to any one of aspects 1 to 6, wherein the oil component further contains a volatile acyclic silicone oil.

[0034] <Scheme 8>

[0035] The cosmetic according to any one of aspects 1 to 7, further comprising at least one selected from a whitening agent and an anti-inflammatory agent.

[0036] <Scheme 9>

[0037] The cosmetic according to any one of aspects 1 to 8, wherein the content of the thickener is 1% by mass or less.

[0038] Effects of the Invention

[0039] According to the present disclosure, it is possible to provide an oil-in-water emulsified cosmetic that is excellent in emulsification stability and can exhibit a disintegration feeling as a feeling during use. DETAILED DESCRIPTION

[0040] Hereinafter, embodiments of the present disclosure will be described in detail. The present disclosure is not limited to the following embodiments, and various modifications can be made within the scope of the gist of the invention.

[0041] The oil-in-water emulsion cosmetic disclosed herein (sometimes referred to simply as "cosmetic") comprises: a dispersion medium comprising water; and oil droplets dispersed in the dispersion medium, wherein the oil droplets contain an oil component, a linear higher fatty acid having 16 or more carbon atoms, a monohydric higher alcohol, and a nonionic surfactant, and further, the oil component in the oil droplets contains at least one selected from a polar oil having an IOB of 0.10 or more and an ultraviolet absorber, and further, the viscosity (V) measured at 0.6 rpm using a B-type viscometer in an atmosphere at 30°C is 0.6rpm) and the viscosity measured at 12 rpm (V 12rpm ) viscosity ratio (V 0.6rpm / V 12rpm ) is 7.9 or above.

[0042] Although not limited by the principle, it is considered that the mechanism of the excellent emulsification stability of such an oil-in-water emulsified cosmetic and the sense of disintegration, that is, the ability to achieve a specific viscosity ratio is as follows.

[0043] When a polar oil having an IOB of 0.10 or more or an ultraviolet absorber having an IOB of 0.10 or more that can be equivalent to such a polar oil is included as the oil component, generally, the emulsification balance is broken, and therefore the emulsification stability of the cosmetic is expected to decrease. Therefore, even if various documents disclose an oil-in-water emulsion composition containing a non-polar oil, a linear higher fatty acid having 16 or more carbon atoms, a monohydric higher alcohol, and a nonionic surfactant, those skilled in the art generally do not think of changing the non-polar oil in such a composition to a polar oil.

[0044] The present inventors have found that, unexpectedly, emulsified particles (oil droplets) prepared using specific materials, namely, a linear higher fatty acid having 16 or more carbon atoms, a monohydric higher alcohol, and a nonionic surfactant, have excellent emulsification stability even when polar oil is used as the oil component.

[0045] It can be considered that the main reason for the manifestation of such emulsion stability is that, for example, straight-chain higher fatty acids having 16 or more carbon atoms, monohydric higher alcohols, and nonionic surfactants form an interfacial film such as a gel film or a liquid crystal film based on lamellar liquid crystals that is relatively strong compared to the micelle structure around the emulsified particles at room temperature, for example, in an atmosphere of 25°C or 30°C, and enclose polar oils that are likely to collapse the emulsification balance.

[0046] Furthermore, it is believed that the presence of such an interface film also affects the disintegration feeling in the cosmetic of the present disclosure. That is, it is believed that the emulsified particles having an interface film are different from particles having a micelle structure, and if a load exceeding the limit value is applied, the interface film will suddenly break, thus presenting a disintegration feeling.

[0047] Definitions of terms in this disclosure are as follows.

[0048] The so-called "disintegration feeling" in the present disclosure refers to the feeling of use when the viscosity of the cosmetic material suddenly decreases when a load is applied to the cosmetic material. Specifically, in the present disclosure, the "disintegration feeling" refers to the state of high viscosity and low fluidity when the cosmetic material is placed on the skin, etc., but when the cosmetic material is applied on the skin, etc. by rubbing each other, the viscosity decreases and becomes a dry and high-fluidity state. The disintegration feeling can be determined by the viscosity (V) measured at 0.6 rpm using a B-type viscometer (TVB-type viscometer TVB-10, manufactured by Toki Sangyo Co., Ltd., rotor number L3) in an atmosphere of 30°C. 0.6rpm ) and the viscosity measured at 12 rpm (V 12rpm ) viscosity ratio (V 0.6rpm / V 12rpm ) stipulates that it refers to the state where the viscosity ratio is greater than 7.9.

[0049] Oil-in-water emulsified cosmetics

[0050] The oil-in-water emulsion cosmetic disclosed herein has excellent emulsion stability. Here, the so-called emulsion stability may refer to, for example, a state in which no separation occurs at 0°C to 37°C for 4 weeks, preferably at 50°C for 4 weeks, and preferably a state in which the size of the emulsion particles (oil droplets) changes little or not at all.

[0051] In addition, the oil-in-water emulsified cosmetic of the present disclosure can exhibit a disintegration feeling. Such a disintegration feeling can be determined by the viscosity ratio (V 0.6rpm / V 12rpm ). The viscosity ratio may be 7.9 or more, 8.0 or more, 8.1 or more, 8.3 or more, 8.5 or more, 8.7 or more, 9.0 or more, 9.5 or more, or 10.0 or more. There is no particular limitation on the upper limit of the viscosity ratio, and for example, it may be 30.0 or less, 25.0 or less, 20.0 or less, or 15.0 or less.

[0052] The viscosity ratio of the oil-in-water emulsion cosmetic can be controlled, for example, by adjusting at least one of the following conditions (a) to (c):

[0053] (a) Mass ratio of straight-chain higher fatty acid to monohydric higher alcohol.

[0054] (b) Types of oil components (eg, polar oils, volatile acyclic silicone oils), linear higher fatty acids having 16 or more carbon atoms, monohydric higher alcohols, and nonionic surfactants, and combinations thereof.

[0055] (c) The proportion of polar oil and / or volatile acyclic silicone oil in the oil component.

[0056] The viscosity (V) of the oil-in-water emulsified cosmetic of the present disclosure measured at 12 rpm is12rpm ), there are no particular restrictions, and it can be appropriately specified in consideration of the application performance and feel of the cosmetic. For example, the viscosity (V) measured at 30°C using a B-type viscometer (TVB-type viscometer TVB-10, manufactured by Toki Sangyo Co., Ltd., rotor number L3) is 12rpm ), can be 20,000 mPa·s or less, 18,000 mPa·s or less, 15,000 mPa·s or less, 12,000 mPa·s or less, 10,000 mPa·s or less, 8,000 mPa·s or less, 6,000 mPa·s or less, or 5,000 mPa·s or less, and can be 2,000 mPa·s or more, 2,200 mPa·s or more, 2,500 mPa·s or more, 2,700 mPa·s or more, or 3,000 mPa·s or more.

[0057] 〈Dispersion Medium〉

[0058] The oil-in-water emulsified cosmetic of the present disclosure contains water as a dispersion medium.

[0059] (water)

[0060] There is no particular limitation on the amount of water to be blended, but from the viewpoints of emulsification stability, disintegration feeling, etc., it may be 50% by mass or more, 60% by mass or more, 70% by mass or more, or 80% by mass or more relative to the total amount of the cosmetic material, and may be 95% by mass or less, 90% by mass or less, or 85% by mass or less.

[0061] The water that can be used in the oil-in-water emulsified cosmetic of the present disclosure is not particularly limited, and water that can be used for cosmetics, quasi-drugs, etc. can be used. For example, ion-exchanged water, distilled water, ultrapure water, tap water, etc. can be used.

[0062] Oil Drop

[0063] The oil droplets as the oil phase or dispersed phase in the water-in-oil emulsified cosmetic contain oil, a straight-chain higher fatty acid having 16 or more carbon atoms, a monohydric higher alcohol, and a nonionic surfactant. Among these components, the straight-chain higher fatty acid having 16 or more carbon atoms, the monohydric higher alcohol, and the nonionic surfactant can form an interfacial film of the oil droplets. Such an interfacial film can be confirmed, for example, using an optical microscope.

[0064] The present inventors have found that, for example, by preparing a solution by mixing a linear higher fatty acid having 16 or more carbon atoms, a monohydric higher alcohol, and a nonionic surfactant together with an oil component having high polarity while heating, and then adding the solution to heated water to prepare an oil-in-water emulsion composition by a liquid crystal emulsification method, oil droplets (emulsified particles) having such an interface film can be obtained.

[0065] There is no particular restriction on the average particle size of the oil droplets as the dispersed phase. For example, the average particle size of such oil droplets immediately after production may be 10 μm or less, 7 μm or less, 5 μm or less, or 3 μm or less. The lower limit of the average particle size is not particularly limited, and may be, for example, 500 nm or more, 700 nm or more, or 1 μm or more. Here, the average particle size of the oil droplets may be defined as the average value of the equivalent circular diameters of the projected areas of 10 or more, preferably 100 or more, oil droplets observed with an optical microscope.

[0066] (oil content)

[0067] The content of the oil in the oil-in-water emulsified cosmetic of the present invention is not particularly limited, and for example, it may be 0.5% by mass or more, 1% by mass or more, 3% by mass or more, 5% by mass or more, 7% by mass or more, 10% by mass or more, 13% by mass or more, or 15% by mass or more, and may be 50% by mass or less, 40% by mass or less, 30% by mass or less, 25% by mass or less, or 20% by mass or less, relative to the total amount of the cosmetic.

[0068] As an oil component, at least one of a polar oil having an IOB of 0.10 or more and an ultraviolet absorber having an IOB of 0.10 or more is included. The cosmetic disclosed herein can improve the emulsification stability of oil droplets by using a straight-chain higher fatty acid, a monovalent higher alcohol, and a nonionic surfactant having a carbon number of 16 or more, so polar oils and ultraviolet absorbers having an IOB of 0.10 or more can be highly mixed. These oil components can include more than 50% by mass, more than 60% by mass, more than 65% by mass, more than 70% by mass, or more than 75% by mass relative to the entire oil component. There is no particular restriction on the upper limit of these oil components, for example, it can be less than 100% by mass, less than 95% by mass, less than 90% by mass, less than 85% by mass, less than 80% by mass, or less than 75% by mass. Here, an organic ultraviolet absorber having an IOB of more than 0.10 can be regarded as an oil component.

[0069] The IOB value of the polar oil and the ultraviolet absorber can be, for example, 0.10 or more, 0.11 or more, 0.12 or more, or 0.13 or less, 0.50 or less, 0.45 or less, or 0.40 or less. Here, the so-called IOB value is an abbreviation of Inorganic / Organic Balance, which is a value indicating the ratio of the inorganic value to the organic value, and is an index showing the degree of polarity of the organic compound. Specifically, the IOB value is expressed as IOB value = inorganic value / organic value. Regarding the "inorganic value" and "organic value", for example, the "inorganic value" of a carbon atom in a molecule is 20, and the "inorganic value" of a hydroxyl group is 100, the "inorganic value" and "organic value" corresponding to various atoms or functional groups are set, and the "inorganic value" and "organic value" of all atoms and functional groups in the organic compound are accumulated to calculate the IOB value of the organic compound (see, for example, Yoshio Koda, "Organic Concept Map - Basics and Applications", pp. 11-17, Sankyo Publishing, 1984).

[0070] a. Polar oil with IOB of 0.10 or above

[0071] Examples of polar oils that satisfy such conditions include isopropyl myristate (IOB value = 0.18), octyl palmitate (IOB value = 0.13), isopropyl palmitate (IOB value = 0.16), butyl stearate (IOB value = 0.14), hexyl laurate (IOB value = 0.17), myristyl myristate (IOB value = 0.11), decyl oleate (IOB value = 0.11), isononyl isononanoate (IOB value = 0.20), and 1,1,2-dimethoxy-1,1-dimethoxy-1,1-dodecanol (IOB value = 0.21). ), isotridecyl isononanoate (IOB value = 0.15), cetyl ethylhexanoate (IOB value = 0.13), pentaerythritol tetraethylhexanoate (IOB value = 0.35), diethylhexyl succinate (IOB value = 0.32), dioctyl succinate (IOB value = 0.36), ethylene glycol distearate (IOB value = 0.16), glyceryl diisostearate (IOB value = 0.29), neopentyl glycol dicaprate (IOB value = 0.25 ), diisostearyl malate (IOB value = 0.28), trimethylolpropane triisostearate (IOB value = 0.16), tri-2-ethylhexanoin (triisooctanoin) (IOB value = 0.35), trimethylolpropane trioctanoate (IOB value = 0.33), trimethylolpropane triisostearate (IOB value = 0.16), diisobutyl adipate (IOB value = 0.46), 2-octyldodecyl N-lauroyl-L-glutamate (IOB value = 0.29), 2-hexyldecyl adipate (IOB value = 0.16), diisopropyl sebacate (IOB value = 0.40), 2-ethylhexyl palmitate (IOB value = 0.13), 2-ethylhexyl ethylhexanoate (IOB value = 0.2), triisostearin (IOB value = 0.16), PPG-3 dineopentanoate (IOB value = 0.52), tri(caprylic acid / capric acid)glyceryl (IOB value = 0.33), etc. These may be used alone or in combination of two or more.

[0072] b. Ultraviolet absorber with IOB of 0.10 or more

[0073] Examples of ultraviolet absorbers that satisfy such conditions include organic ultraviolet absorbers such as ethylhexyl methoxycinnamate, octocrylene, polysilicone-15, tert-butyl methoxydibenzoylmethane, ethylhexyl triazone, bis-ethylhexyloxyphenol methoxyphenyl triazine, diethylaminohydroxybenzoyl hexyl benzoate, benzophenone-3, methylene bisbenzotriazolyl tetramethylbutylphenol, homosalate, and ethylhexyl salicylate. These ultraviolet absorbers may be used alone or in combination of two or more.

[0074] (Straight-chain higher fatty acid with 16 or more carbon atoms)

[0075] The content of the straight-chain higher fatty acid having 16 or more carbon atoms in the oil-in-water emulsified cosmetic of the present invention is not particularly limited, and for example, it may be 0.10% by mass or more, 0.15% by mass or more, 0.20% by mass or more, 0.25% by mass or more, or 0.30% by mass or more, and may be 5.0% by mass or less, 3.0% by mass or less, or 1.0% by mass or less, relative to the total amount of the cosmetic.

[0076] The oil-in-water emulsified cosmetic of the present invention may contain higher fatty acids other than straight-chain higher fatty acids having 16 or more carbon atoms, for example, straight-chain or branched higher fatty acids having less than 16 carbon atoms, or branched higher fatty acids having 16 or more carbon atoms, within a range that does not affect the effects of the present invention. However, from the viewpoint of disintegration feeling and emulsion stability, these other higher fatty acids are preferably contained in a range of, for example, less than 0.10 mass %, less than 0.05 mass %, or less than 0.01 mass % relative to the total amount of the cosmetic. Furthermore, these other higher fatty acids are more preferably not contained in the cosmetic.

[0077] The number of carbon atoms in the straight-chain higher fatty acid may be 16 or more, or 18 or more, and may be 25 or less, 24 or less, or 22 or less.

[0078] As such straight-chain higher fatty acids, for example, saturated fatty acids such as palmitic acid, stearic acid, arachidic acid, behenic acid (n-docosanoic acid), and lignoceric acid, and unsaturated fatty acids such as palmitoleic acid, oleic acid, linoleic acid, α-linolenic acid, γ-linolenic acid, arachidonic acid, eicosapentaenoic acid, and docosahexaenoic acid can be cited. Among them, from the viewpoint of disintegration, saturated fatty acids are preferred, stearic acid and behenic acid are more preferred, and behenic acid is particularly preferred. These straight-chain higher fatty acids can be used alone or in combination of two or more.

[0079] (Monohydric higher alcohol)

[0080] The content of the monohydric higher alcohol in the oil-in-water emulsified cosmetic of the present invention is not particularly limited, and for example, it may be 0.1% by mass or more, 0.3% by mass or more, 0.5% by mass or more, 0.7% by mass or more, or 1.0% by mass or more, relative to the total amount of the cosmetic, and may be 5.0% by mass or less, 4.0% by mass or less, or 3.0% by mass or less.

[0081] As the monohydric higher alcohol, there is no particular limitation, and for example, saturated or unsaturated monohydric aliphatic alcohols can be used, which may be either linear or branched, but are preferably linear. From the viewpoint of emulsification stability and disintegration feeling, it is preferred that the monohydric higher alcohol is a solid at room temperature, for example, a gel film or liquid crystal film based on lamellar liquid crystals is easily formed at room temperature or above together with a linear higher fatty acid and a nonionic surfactant. Here, the so-called "normal temperature" in the present disclosure refers to the range of 5°C to 35°C.

[0082] As such a monohydric higher alcohol, there can be mentioned a higher alcohol having a melting point of 40°C or more, for example, a monohydric aliphatic alcohol having 10 to 30 carbon atoms. Specifically, for example, stearyl alcohol, isostearyl alcohol, oleyl alcohol, octyldodecanol, cholesterol, sitosterol, cetyl alcohol (hexadecanol), a mixture of cetostearyl alcohol, decyltetradecyl alcohol, phytosterol, hexyldecyl alcohol, behenyl alcohol, lauryl alcohol, lanolin alcohol, hydrogenated lanolin alcohol, etc. Among them, from the viewpoint of emulsification stability and disintegration feeling, cetyl alcohol, isostearyl alcohol, stearyl alcohol, and behenyl alcohol are preferred, and behenyl alcohol is more preferred. These higher alcohols can be used alone or in combination of two or more.

[0083] a. Mass ratio of higher alcohols to straight-chain higher fatty acids

[0084] As the mass ratio of the straight-chain higher fatty acid having 16 or more carbon atoms to the monovalent higher alcohol, from the viewpoints of emulsification stability, disintegration feeling, etc., it is preferably 0.50 or more, 0.55 or more, 0.60 or more, or 0.65 or more, and it is preferably 2.0 or less, 1.7 or less, 1.5 or less, or 1.3 or less. In some embodiments, when the water-in-oil emulsified cosmetic of the present disclosure contains the volatile non-cyclic silicone oil described later as the oil component, such a mass ratio may be 0.30 or more, 0.35 or more, 0.40 or more, 0.45 or more, 0.50 or more, 0.55 or more, 0.60 or more, or 0.65 or more, and it may be 2.0 or less, 1.7 or less, 1.5 or less, or 1.3 or less.

[0085] (Nonionic surfactant)

[0086] The content of the nonionic surfactant in the oil-in-water emulsified cosmetic of the present invention is not particularly limited, and for example, it may be 0.1% by mass or more, 0.3% by mass or more, or 0.5% by mass or more, and may be 5.0% by mass or less, 4.0% by mass or less, 3.0% by mass or less, or 2.0% by mass or less, relative to the total amount of the cosmetic.

[0087] The nonionic surfactant is not particularly limited, and examples thereof include polyoxyalkylene alkyl ethers, polyalkylene glycol fatty acid esters, POE alkyl ethers, POE / POP alkyl ethers, PEG fatty acid esters, polyglycerol fatty acid esters, POE glycerol fatty acid esters, isostearic acid PEG glyceryl esters, and silicone surfactants. These may be used alone or in combination of two or more.

[0088] Examples of the polyoxyalkylene alkyl ether include polyoxyethylene behenyl ether and polyoxyethylene stearyl ether.

[0089] Examples of the polyalkylene glycol fatty acid esters include polyethylene glycol monostearate and polyethylene glycol monooleate.

[0090] Examples of the POE alkyl ethers include POE (2) lauryl ether, POE (4.2) lauryl ether, POE (9) lauryl ether, POE (5.5) cetyl ether, POE (7) cetyl ether, POE (10) cetyl ether, POE (15) cetyl ether, POE (20) cetyl ether, POE (23) cetyl ether, POE (4) stearyl ether, POE (20) stearyl ether, POE (7) oleyl ether, POE (10) oleyl ether, POE (15) oleyl ether, POE (20) oleyl ether, POE (50) oleyl ether, POE (10) behenyl ether, POE (20) behenyl ether, POE (30) behenyl ether, POE (2) (C12-15) alkyl ether, POE (4) (C12-15) alkyl ether, POE (10) (C12-15) alkyl ether, POE (5) secondary alkyl ether, POE (7) secondary alkyl ether, POE (9) alkyl ether, POE (12) alkyl ether, etc.

[0091] Examples of POE / POP alkyl ethers include POE(1) polyoxypropylene (POP)(4) cetyl ether, POE(10) POP(4) cetyl ether, POE(20) POP(8) cetyl ether, POE(20) POP(6) decyltetradecyl ether, and POE(30) POP(6) decyltetradecyl ether.

[0092] Examples of PEG fatty acid esters include polyethylene glycol monolaurate (hereinafter abbreviated as PEG) (10), PEG monostearate (10), PEG monostearate (25), PEG monostearate (40), PEG monostearate (45), PEG monostearate (55), PEG monostearate (100), PEG monooleate (10), PEG distearate, PEG diisostearate, PEG (40) hydrogenated castor oil, PEG (50) hydrogenated castor oil, PEG (60) hydrogenated castor oil, and PEG (100) hydrogenated castor oil.

[0093] Examples of the polyglycerol fatty acid esters include hexaglyceryl monolaurate, hexaglyceryl monomyristicate, hexaglyceryl monostearate, hexaglyceryl monooleate, decaglyceryl monolaurate, decaglyceryl monomyristicate, decaglyceryl monostearate, decaglyceryl monoisostearate, decaglyceryl monooleate, decaglyceryl distearate, and decaglyceryl diisostearate.

[0094] Examples of the POE glyceryl fatty acid esters include polyoxyethylene (POE) (5) glyceryl monostearate, POE (15) glyceryl monostearate, POE (5) glyceryl monooleate, and POE (15) glyceryl monooleate.

[0095] Examples of the isostearic acid PEG glyceryl esters include isostearic acid PEG (8) glyceryl, isostearic acid PEG (10) glyceryl, isostearic acid PEG (15) glyceryl, isostearic acid PEG (20) glyceryl, isostearic acid PEG (25) glyceryl, isostearic acid PEG glyceryl (30), isostearic acid PEG (40) glyceryl, isostearic acid PEG (50) glyceryl, and isostearic acid PEG (60) glyceryl.

[0096] Examples of the silicone-based surfactants include PEG (7) polydimethylsiloxane and PEG (10) polydimethylsiloxane.

[0097] Among them, from the viewpoints of emulsification stability, disintegration feeling, etc., PEG fatty acid esters, isostearic acid PEG glyceryl esters and silicone surfactants are preferred, and PEG (60) hydrogenated castor oil, isostearic acid PEG (60) glyceryl ester and PEG (10) polydimethylsiloxane are more preferred. They can be used alone, but are preferably used in combination.

[0098] 〈Optional Ingredients〉

[0099] The oil-in-water emulsified cosmetic of the present disclosure may be appropriately blended with various components within a range that does not affect the effects of the present invention. Examples of the various components include additives that can be generally blended in cosmetics. For example, humectants such as 1,3-butylene glycol, propylene glycol, and glycerin for explosives, anionic surfactants, cationic surfactants, amphoteric surfactants, water-soluble polymers, oil-soluble polymers, film-forming agents such as organosiliconized polysaccharides, sequestering agents, lower alcohols such as ethanol, polyols such as PEG6000 and dipropylene glycol, higher alcohols other than the above, various extracts, sugars, amino acids, organic amines, polymer emulsions, chelating agents, ultraviolet absorbers other than the above ultraviolet absorbers, ultraviolet scattering agents such as zinc oxide, pH adjusters, skin nutrients, vitamins, water-soluble drugs that can be used in drugs, quasi-drugs, cosmetics, etc., whitening agents, anti-inflammatory agents, antioxidants, buffers, preservatives, antioxidant aids, thickeners, dispersants, propellants, organic powders, clay minerals, pigments, dyes, pigments, fragrances, acid components, alkaline components, non-polar oil components such as polydimethylsiloxane, etc. These optional components may be used alone or in combination of two or more, and may be appropriately blended in the oil phase and / or the water phase.

[0100] Among these additives, higher alcohols other than the above are preferably used from the viewpoints of suppressing crystallization of the interface film, disintegration feeling, etc. As such higher alcohols, divalent higher alcohols are preferred, and batyl alcohol is particularly preferred.

[0101] In addition, it is generally difficult to improve the emulsification stability of oil-in-water emulsion cosmetics using polar oils, and therefore a thickener, particularly a water-soluble thickener, is usually used to ensure the emulsification stability of such cosmetics. However, the addition of a thickener may improve the emulsification stability, but may have an adverse effect on the disintegration feeling, that is, the achievement of a specific viscosity ratio, and may also easily give rise to a sticky feeling.

[0102] On the other hand, the emulsified particles (oil droplets) in the oil-in-water emulsified cosmetic of the present disclosure are prepared using specific materials, i.e., a linear higher fatty acid having 16 or more carbon atoms, a monovalent higher alcohol, and a nonionic surfactant, and the emulsification stability is excellent, so the cosmetic of the present disclosure may not substantially contain a thickener. That is, the thickener may be mixed at a ratio of 1% by mass or less, 0.5% by mass or less, 0.1% by mass or less, 0.01% by mass or less, or 0.001% by mass or less relative to the total amount of the cosmetic, but from the viewpoint of disintegration, etc., it is advantageous not to use a thickener.

[0103] In some embodiments, the water-in-oil emulsified cosmetic disclosed in the present invention can be mixed with a non-polar oil such as polydimethylsiloxane as an oil component. Among them, if a volatile non-cyclic silicone oil is mixed, the film strength of the interface film such as the gel film or liquid crystal film formed around the oil droplets can be further improved, so whitening agents, anti-inflammatory agents and other drugs that are easy to deteriorate the emulsification stability can also be mixed. In addition, the use of volatile non-cyclic silicone oil that can improve the film strength of the interface film can also increase the static viscosity while suppressing the increase in the dynamic viscosity of the cosmetic, so it is easy to increase the viscosity ratio, that is, the disintegration feeling is more expressed. Here, the so-called "volatility" refers to the volatile component that is more than 5% when placed at 105°C for 3 hours under atmospheric pressure. From the viewpoint of obtaining excellent film strength and disintegration feeling, the volatile component that serves as an indicator of volatility is preferably 10% or more, 20% or more, 40% or more, 50% or more, 60% or more, 80% or more, or 100%. Alternatively, as an indicator of volatility, the boiling point under 1 atmosphere (101.325 kPa) can be used. From the viewpoint of obtaining excellent film strength and disintegration feeling, the boiling point is preferably 250°C or less, 240°C or less, or 230°C or less, and preferably 80°C or more, 100°C or more, 120°C or more, 150°C or more, or 160°C or more. In addition, the term "non-volatile" in the present disclosure means that the volatile component is 5% or less when left at 105°C for 3 hours.

[0104] As the volatile non-cyclic silicone oil, for example, volatile linear silicone oil and volatile branched silicone oil can be used. Among them, volatile linear silicone oil is preferred. The volatile non-cyclic silicone oil can be used alone or in combination of two or more.

[0105] Examples of volatile linear silicone oils include low molecular weight linear dimethylpolysiloxanes such as dimethylpolysiloxane with a viscosity of 0.65 cSt (sometimes referred to as "polydimethylsiloxane"), dimethylpolysiloxane with a viscosity of 1 cSt, dimethylpolysiloxane with a viscosity of 1.5 cSt, and dimethylpolysiloxane with a viscosity of 2 cSt. Here, these viscosities refer to the kinematic viscosities at 25°C.

[0106] Examples of the volatile branched silicone oil include low molecular weight branched siloxanes such as methyl polytrimethylsiloxane, tris(trimethylsilyl)methylsilane and tetrakis(trimethylsilyl)silane.

[0107] The content of the volatile non-cyclic silicone oil in the water-in-oil emulsified cosmetic disclosed herein is not particularly limited, and for example, it may be 0.1% by mass or more, 0.3% by mass or more, 0.5% by mass or more, 0.7% by mass or more, or 1.0% by mass or more relative to the total amount of the cosmetic, and may be less than 20.0% by mass, 15.0% by mass or less, 10.0% by mass or less, 9.0% by mass or less, 8.0% by mass or less, 7.0% by mass or less, 6.0% by mass or less, 5.0% by mass or less, 4.0% by mass or less, or 3.0% by mass or less. Alternatively, the content of the volatile non-cyclic silicone oil may be 15% by mass or more, 17% by mass or more, or 20% by mass or more relative to the total amount of the oil, and may be about 50% by mass or less, about 40% by mass or less, or about 30% by mass or less.

[0108] In some embodiments, the water-in-oil emulsified cosmetic disclosed herein can be mixed with volatile cyclic silicone oil and non-volatile non-cyclic silicone oil as oil. However, in the case where the film strength of the interfacial film is further improved by mixing volatile non-cyclic silicone oil, the content of volatile cyclic silicone oil and non-volatile non-cyclic silicone oil is independently relative to the total amount of cosmetics, preferably less than 20.0 mass%, less than 15.0 mass%, less than 10.0 mass%, less than 7.0 mass%, less than 5.0 mass%, less than 3.0 mass% or less than 1.0 mass%. Alternatively, the content of volatile cyclic silicone oil and non-volatile non-cyclic silicone oil is independently relative to the total amount of oil and preferably less than 10.0 mass%, less than 7.0 mass%, less than 5.0 mass%, less than 3.0 mass% or less than 1.0 mass%. Furthermore, it is more preferred that the volatile cyclic silicone oil and / or the nonvolatile acyclic silicone oil is not mixed in the oil component, and it is particularly preferred that the volatile cyclic silicone oil is not mixed in the oil component.

[0109] In some embodiments, the water-in-oil emulsified cosmetic of the present disclosure may be mixed with at least one selected from whitening agents and anti-inflammatory agents. Whitening agents and anti-inflammatory agents, especially acid-type whitening agents and anti-inflammatory agents, salt-type whitening agents and anti-inflammatory agents are generally easy to deteriorate the emulsification stability. However, the water-in-oil emulsified cosmetic of the present disclosure, which is mixed with volatile non-cyclic silicone oil to further improve the film strength of the interface film, can also show good emulsification stability even if such whitening agents and anti-inflammatory agents are mixed.

[0110] As a whitening agent, there is no particular limitation as long as it is an agent that exhibits a whitening effect. As examples thereof, at least one acid-type whitening agent selected from ascorbic acid (L-ascorbic acid), tranexamic acid, glycyrrhizic acid, nicotinic acid, kojic acid, ellagic acid, 1-piperidine propionic acid, 3-O-ethyl-L-ascorbic acid, and alkoxy salicylic acid (e.g., 4-methoxy salicylic acid); at least one salt-type whitening agent selected from ascorbate, tranexamic acid, glycyrrhizic acid, nicotinic acid, kojic acid, ellagic acid, 1-piperidine propionic acid, 3-O-ethyl-L-ascorbic acid, and alkoxy salicylic acid (e.g., 4-methoxy salicylic acid); and the like. As salts of salt-type whitening agents, alkali metal salts such as sodium salts and potassium salts; alkaline earth metal salts such as calcium salts and magnesium salts; zinc salts; iron salts; ammonium salts; salts with basic amino acids such as arginine, lysine, histidine, ornithine; salts with amines such as monoethanolamine, diethanolamine, triethanolamine, etc. As other whitening agents, for example, ascorbic acid derivatives (such as ascorbyl glucoside), tranexamic acid derivatives, glycyrrhizic acid derivatives, nicotinic acid derivatives, kojic acid derivatives (such as kojic acid dipalmitate), ellagic acid derivatives, alkoxysalicylic acid derivatives, hydroquinone, α-arbutin, β-arbutin, nicotinamide, astaxanthin, dimercapryloyl histidine (Na / zinc), chamomile extract, licorice extract, placenta extract, rosemary extract, 4-n-butylresorcinol, magnolia lignan, etc. can be mentioned. Whitening agents can be used alone or in combination of two or more.

[0111] As an anti-inflammatory agent, there is no particular limitation as long as it is an agent that exhibits an anti-inflammatory effect. However, an agent that exhibits both whitening and anti-inflammatory effects is treated as a whitening agent in the present disclosure. Examples of anti-inflammatory agents include L-ascorbyl magnesium phosphate, glycyrrhizin, dipotassium glycyrrhizinate, ammonium glycyrrhizinate, allantoin, and the like.

[0112] There is no particular limitation on the amount of the whitening agent and the anti-inflammatory agent mixed. For example, each independently relative to the total amount of the cosmetic material may be 0.01% by mass or more, 0.05% by mass or more, 0.1% by mass or more, 0.3% by mass or more, 0.5% by mass or more, 0.7% by mass or more, or 1.0% by mass or less; further, may be 15.0% by mass or less, 10.0% by mass or less, 8.0% by mass or less, or 5.0% by mass or less.

[0113] 《Application of oil-in-water emulsified cosmetics》

[0114] The oil-in-water emulsified cosmetic disclosed herein can exhibit a disintegration feeling such that the viscosity of the cosmetic suddenly decreases when a load is applied. Therefore, the cosmetic disclosed herein that exhibits such a feeling of use can be used as a cosmetic applied to the skin, etc. Here, the cosmetic applied to the skin may also include substances called skin external preparations.

[0115] The dosage form of the cosmetic of the present disclosure is not particularly limited, and examples thereof include liquid, emulsion, cream, gel, spray, mousse, etc. Here, the term "spray" in the present disclosure may include mist-type spray, aerosol-type spray, etc.

[0116] The product form of the cosmetic disclosed in the present invention is not particularly limited, and examples thereof include facial cosmetics such as lotions, beauty essences, emulsions, and facial masks; color makeup cosmetics such as foundations; sunscreen cosmetics (sunscreen agents); body cosmetics; skin cleansing materials such as makeup removers and body shampoos; hair cosmetics such as shampoos, hair tonics, conditioners, shampoos, rinse-off conditioners, and hair growth materials; ointments, etc.

[0117] "Method for producing oil-in-water emulsified cosmetics"

[0118] The oil-in-water emulsified cosmetic disclosed herein can be prepared by a known method such as a dispersion method or an aggregation method.

[0119] The so-called dispersion method is a method of finely dividing the mass of the dispersed phase by mechanical force. Specifically, it is a method of emulsifying by utilizing the crushing force of an emulsifier. Examples of such methods include a high-pressure emulsification method using a high-pressure homogenizer to apply a high shear force.

[0120] The so-called aggregation method is a colloid modulation method that utilizes the surface chemical characteristics. It is a method of making a dispersed phase substance appear by a certain means from a uniformly dissolved state to a supersaturated state. As specific methods, liquid crystal emulsification method, HLB temperature emulsification method, phase inversion emulsification method, non-aqueous emulsification method, D-phase emulsification method, etc. are known.

[0121] Among these methods, it is advantageous to prepare the oil-in-water emulsified cosmetic material disclosed herein by the liquid crystal emulsification method from the viewpoints of emulsification stability, disintegration feeling, etc. An interface film such as a gel film or a liquid crystal film based on lamellar liquid crystals or the like is easily formed near the interface of the emulsified particles prepared by the liquid crystal emulsification method. As a result, the aggregation and coalescence of the emulsified particles are suppressed, the emulsification stability is improved, and the disintegration feeling is more easily expressed by the firm interface film.

[0122] As a preparation method of the cosmetic material disclosed in the present invention using the liquid crystal emulsification method, for example, the following method can be adopted: It should be noted that the polar oil, the straight-chain higher fatty acid having 16 or more carbon atoms, the monohydric higher alcohol, the nonionic surfactant, the optional components, etc. can be the same as those mentioned above.

[0123] Polar oil, linear higher fatty acid having 16 or more carbon atoms, monohydric higher alcohol, nonionic surfactant, and optionally added oil-soluble optional component are mixed while heating to about 70 to 90° C. to prepare an oil phase solution. Then, water and optionally added water-soluble optional component are mixed while heating to about 70 to 90° C. to prepare an aqueous phase solution, and the oil phase solution is slowly added to the aqueous phase solution while stirring, followed by cooling to room temperature, thereby preparing the oil-in-water emulsified cosmetic of the present disclosure.

[0124] In the conventional liquid crystal emulsification method, since it has been confirmed that an interface film such as a gel film or a liquid crystal film based on lamellar liquid crystals is formed around the emulsified particles at the stage of being cooled to room temperature, it can be considered that the emulsified particles of the present invention also form such an interface film around the emulsified particles at the same stage.

[0125] Example

[0126] The present invention will be described in further detail below with reference to Examples, but the present invention is not limited thereto. It should be noted that, below, the blending amount is expressed in mass % unless otherwise specified.

[0127] 《Examples 1 to 7 and Comparative Examples 1 to 8》

[0128] The following evaluations were performed on the oil-in-water emulsified cosmetics obtained by the formulations shown in Tables 1 to 3 and the production methods shown below. The results are shown in Tables 1 to 3.

[0129] 〈Evaluation Method〉

[0130] (Evaluation of viscosity)

[0131] The viscosity of the cosmetic material was evaluated using a B-type viscometer (TVB-type viscometer TVB-10, manufactured by Toki Sangyo Co., Ltd.) under the conditions of rotor number L3, 30°C, 0.6 rpm and 12 rpm. The results and the viscosity ratio calculated from the obtained results are summarized in the table. Here, in the table, the viscosity measured at 0.6 rpm is marked as "V 0.6rpm ", the viscosity measured at 12 rpm is marked as "V 12rpm ”, and the viscosity ratio is marked as “V 0.6rpm / V 12rpm ”.

[0132] (Evaluation of emulsion stability)

[0133] The size of oil droplets within 1 hour after the preparation of the emulsified cosmetic and the size of oil droplets after storage at 50° C. for 4 weeks were observed using an optical microscope, and the emulsification stability was evaluated based on the following criteria:

[0134] A: There is almost no change in the oil droplet size.

[0135] B: The oil droplet size has increased slightly.

[0136] C: The oil droplet size has increased significantly, or the cosmetic material has separated.

[0137] <Method for producing cosmetics>

[0138] (Example 1)

[0139] The oil-in-water emulsified cosmetic was produced by the liquid crystal emulsification method shown below using the formulation shown in Table 1. Here, the numbers shown below correspond to the numbers showing the names of the ingredients on the left side of the formulation in Table 1.

[0140] While heating to 70 to 90° C., the oil components No. 10 to No. 13 and the ultraviolet absorbers No. 14 and No. 15 are uniformly mixed, and then the nonionic surfactants No. 1 and No. 2, the higher alcohols No. 3 and No. 4, and the behenic acid No. 5 which is a straight-chain higher fatty acid are further mixed to prepare an oil phase solution.

[0141] Next, while heating to 70 to 90° C., materials No. 16 to No. 23 were added to ion exchange water No. 24 and uniformly mixed to prepare an aqueous phase solution.

[0142] The oil phase solution was slowly added to the aqueous phase solution while being heated to 70 to 90° C., and uniformly dispersed using a dispenser, followed by cooling to room temperature to obtain the oil-in-water emulsified cosmetic of Example 1.

[0143] (Example 2 and Comparative Examples 1 to 7)

[0144] Except having changed the components and compounding amounts of the oil phase solution and the water phase solution into the components and compounding amounts shown in Table 1, it carried out similarly to Example 1, and obtained the oil-in-water emulsified cosmetics of Example 2 and Comparative Examples 1-7.

[0145] (Examples 3 to 6)

[0146] Except having changed the components and compounding amounts of the oil phase solution and the water phase solution into the components and compounding amounts shown in Table 2, it carried out similarly to Example 1, and obtained the oil-in-water emulsified cosmetics of Examples 3 to 6.

[0147] (Example 7 and Comparative Example 8)

[0148] Except having changed the components and compounding amounts of the oil phase solution and the water phase solution into the components and compounding amounts shown in Table 3, it carried out similarly to Example 1, and obtained the oil-in-water emulsified cosmetics of Example 7 and Comparative Example 8.

[0149] [Table 1]

[0150]

[0151] <result>

[0152] As is clear from Table 1, since the emulsified cosmetics of Comparative Examples 1 to 7 have a viscosity ratio of less than 7.9, no disintegration is felt even when these cosmetics are applied to the skin and spread. In particular, it is known that the emulsified cosmetics of Comparative Examples 6 to 7 lack emulsification stability. On the other hand, since the emulsified cosmetics of Examples 1 to 2 have excellent emulsification stability and a viscosity ratio of 7.9 or more, it is confirmed that good disintegration is exhibited when these cosmetics are applied to the skin and spread.

[0153] [Table 2]

[0154] Table 2

[0155]

[0156] <result>

[0157] If Example 1 is compared with Example 3, it is clear that if cyclopentasiloxane, a volatile cyclic silicone oil, is replaced with polydimethylsiloxane (1.5 cst), a volatile non-cyclic silicone oil, the viscosity ratio of the emulsified cosmetic increases. Furthermore, if these cosmetics are applied to the skin and spread, it is confirmed that the cosmetic of Example 3 presents a better sense of disintegration. It can be considered that such performance is affected by the different compatibility of cyclic silicone oil and non-cyclic silicone oil to the components constituting the interface film. That is, non-cyclic silicone oil has a property that is not easy to be compatible with the components constituting the interface film compared with cyclic silicone oils such as cyclopentasiloxane. Therefore, if volatile non-cyclic silicone oil is used as an oil component, the interface film constituent components are easier to separate from the oil component than the case of easily compatible cyclic silicone oils. As a result, since more interface film constituent components move to the vicinity of the interface between the oil phase and the water phase, it can be considered that a more solid interface film is formed, which can exert the above-mentioned performance.

[0158] In addition, the emulsified cosmetics of Examples 4 to 6 are cosmetics in which various whitening agents are further blended into the cosmetics of the composition of Example 3. Such whitening agents are generally prone to deteriorate the emulsification stability, but in the case of cosmetics prepared using volatile acyclic silicone oils, it was confirmed that the emulsification stability was excellent even if a whitening agent was blended. In addition, although the emulsified cosmetics of Examples 4 to 6 contain whitening agents, they have a viscosity ratio of 7.9 or more, so when these cosmetics are applied to the skin and spread, it is confirmed that they show a good disintegration feeling.

[0159] [Table 3]

[0160] Table 3

[0161]

[0162] <result>

[0163] Comparing Comparative Example 8 with Example 7, it is clear that when volatile acyclic silicone oil is used as the oil component instead of nonvolatile acyclic silicone oil, good emulsion stability can be exhibited even when a whitening agent is mixed, and a viscosity ratio of 7.9 or more can be achieved.

[0164] Furthermore, it was confirmed that by changing the type of nonpolar oil to volatile non-cyclic silicone oil, even if the mass ratio of the linear higher fatty acid to the monohydric higher alcohol was less than 0.50, a viscosity ratio of 7.9 or more could be achieved.

Claims

1. An oil-in-water emulsified cosmetic comprising: a dispersion medium comprising water; and Oil droplets dispersed in the dispersion medium, The oil droplets contain oil, a straight-chain higher fatty acid having 16 or more carbon atoms, a monovalent higher alcohol, and a nonionic surfactant. The oil component includes at least one selected from polar oils having an IOB of 0.10 or more and ultraviolet absorbers having an IOB of 0.10 or more, and volatile acyclic silicone oil. The cosmetic contains at least one selected from a whitening agent and an anti-inflammatory agent, and the blending amount of the whitening agent and the anti-inflammatory agent is independently 0.3% by mass or more relative to the total amount of the cosmetic, and the viscosity V is measured at 0.6 rpm using a B-type viscometer at 30° C. 0.6rpm The viscosity V measured at 12 rpm 12rpm The viscosity ratio V 0.6rpm / V 12rpm It is above 7.

9. 2 . The cosmetic according to claim 1 , wherein the mass ratio of the straight-chain higher fatty acid to the monohydric higher alcohol is 0.50 or more. 3 . The cosmetic according to claim 1 , wherein the straight-chain higher fatty acid, the higher alcohol, and the nonionic surfactant form an interfacial film of the oil droplets under an atmosphere of 25° C.

4. The cosmetic according to claim 1 or 2, wherein the straight-chain higher fatty acid is at least one selected from stearic acid and behenic acid, and the higher alcohol is at least one selected from cetyl alcohol, isostearyl alcohol, stearyl alcohol, and behenyl alcohol.

5. The cosmetic according to claim 1 or 2, wherein at least one selected from the group consisting of a polar oil having an IOB of 0.10 or more and an ultraviolet absorber having an IOB of 0.10 or more is contained in the oil component in an amount of 50% by mass or more. The cosmetic according to claim 1 or 2, further comprising a dihydric higher alcohol.

7. The cosmetic according to claim 1 or 2, wherein the content of the thickener is 1% by mass or less.

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