Multilayer cosmetic

Abstract

To provide a multilayer cosmetic which prevents foaming when shaken, enables the layer interfaces to remain transparent and free of turbidity after standing, and exhibits a fresh feeling and good compatibility to the skin when applied to the skin.SOLUTION: A multilayer cosmetic comprises the following components (A) to (E): (A) a silicone-based surfactant having an HLB of 10 or more and 20 or less, (B) a surfactant having an HLB of 2 or more and less than 10, (C) an oily agent that is liquid at 25°C, (D) an electrolyte, and (E) water.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a multi-layer cosmetic.

Background Art

[0002] There is known a multi-layer cosmetic that separates into a plurality of layers when standing still, and is applied to the skin after shaking it into a uniform dispersion state during use. For example, Patent Document 1 describes that a two-layer separation type cosmetic containing PEG-9 polydimethylsiloxyethyl dimethicone and / or lauryl PEG-9 polydimethylsiloxyethyl dimethicone and an alkyl glyceryl ether having 12 to 24 carbon atoms in the alkyl group can form a stable high internal phase emulsion form and has a moist feel. Patent Document 2 describes that a cosmetic containing dextran having a number average molecular weight of 50,000 to 300,000, polyethylene glycol having a number average molecular weight of 4,000 to 30,000, an electrolyte, an ionic surfactant, water, and an oily component has two stable water layers and an oil layer, is excellent in aesthetic properties, and also has excellent usability. Patent Document 3 describes that a multi-layer cosmetic containing a nonionic surfactant having an HLB of 2 to 9, a polyhydric alcohol, a branched hydrocarbon and / or a phenyl-modified silicone that is liquid at 25°C, dimethylpolysiloxane and / or methyltrimethicone, and an ester oil having an IOB value of more than 0 and 0.18 or less becomes easily uniformly dispersed during shaking, and when standing still, the interface of each layer separates into two or more layers with clear interfaces, is excellent in the aesthetic properties of the cosmetic appearance, and also has good usability.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

[0004] Conventional multi-layer cosmetics have problems in that when shaken during use, they easily foam, and when a high proportion of water is contained, turbidity occurs at the oil-water interface, resulting in poor aesthetic properties. Also, the freshness when applied to the skin and the compatibility with the skin were not fully satisfactory. [Means for Solving the Problems]

[0005] The present inventors have found that by using a combination of an electrolyte with two surfactants having specific HLB values, a multi-layer cosmetic containing an oil layer and a water layer can be obtained, in which foaming is suppressed during shaking, and after standing, the interface of each layer is transparent without turbidity, and when applied to the skin, it is fresh and has good compatibility with the skin.

[0006] The present invention relates to a multi-layer cosmetic containing the following components (A) to (E): (A) A silicone surfactant having an HLB of 10 or more and 20 or less, (B) A surfactant having an HLB of 2 or more and less than 10, (C) An oil agent that is liquid at 25°C, (D) An electrolyte, (E) Water and relates to a multi-layer cosmetic containing the same. [Effects of the Invention]

[0007] The multi-layer cosmetic of the present invention is excellent in aesthetic properties in that foaming is suppressed during shaking, and after standing, the interface of each layer is transparent without turbidity. Also, when applied to the skin, it is fresh, has good compatibility with the skin, and quickly penetrates into the skin. [Modes for Carrying Out the Invention]

[0008] Component (A) used in the present invention is a silicone surfactant having an HLB of 10 or more and 20 or less. Here, the HLB (Hydrophilic-Lipophilic Balance) indicates the molecular weight of the hydrophilic group portion in the total molecular weight of the surfactant. In the present invention, for nonionic surfactants, it is determined by the Griffin's formula. From the viewpoint of suppressing foaming during shaking and suppressing cloudiness at the interface of each layer and making it transparent after standing following shaking, the HLB of component (A) is preferably from 12 to 16, more preferably from 13 to 15.

[0009] Examples of the silicone surfactant as component (A) include polyether-modified silicones. For example, polyether-modified silicones with a linear silicone chain such as PEG-10 dimethicone, PEG-12 dimethicone, and PEG-11 methyl ether dimethicone can be mentioned.

[0010] Examples of commercially available products of the silicone surfactant as component (A) include DOWSIL SS-2804 (manufactured by Dow Corning Toray Co., Ltd., HLB: 13.5) which is PEG-12 dimethicone, silicone KF6043 (manufactured by Shin-Etsu Chemical Co., Ltd., HLB: 14.5) which is PEG-10 dimethicone, and silicone KF6011 (manufactured by Shin-Etsu Chemical Co., Ltd., HLB: 14.5) which is PEG-11 methyl ether dimethicone.

[0011] From the viewpoint of suppressing foaming during shaking and suppressing cloudiness at the interface of each layer and making it transparent after standing following shaking, component (A) preferably contains one or more selected from polyether-modified silicones with a linear silicone chain. More preferably, it contains one or two or more selected from PEG-12 dimethicone, PEG-10 dimethicone, and PEG-11 methyl ether dimethicone. Even more preferably, it contains one or more selected from PEG-12 dimethicone and PEG-11 methyl ether dimethicone. Even more preferably, it contains PEG-12 dimethicone.

[0012] Component (A) can be used alone or in combination of two or more. From the viewpoints of suppressing foaming during shaking, suppressing cloudiness at the interface of each layer and making it transparent after standing still after shaking, improving the freshness when applied to the skin, and improving the affinity when applied to the skin, the content is preferably 0.00005 to 0.04% by mass, more preferably 0.00015 to 0.03% by mass, and even more preferably 0.001 to 0.01% by mass in the total composition.

[0013] Component (B) is a surfactant with an HLB of 2 or more and less than 10, and a nonionic surfactant is preferred. From the viewpoints of suppressing foaming during shaking and suppressing cloudiness at the interface of each layer and making it transparent after standing still after shaking, the HLB of component (B) is preferably 3 to 8, and more preferably 4 to 6. The surfactant of component (B) is not limited as long as it is commonly used in cosmetics. For example, polyoxyethylene fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene sorbitol fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyoxyethylene propylene glycol fatty acid ester, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, polyoxyethylene hydrogenated castor oil fatty acid ester, polyoxyethylene phytostanol ether, polyoxyethylene phytosterol ether, polyoxyethylene cholestanol ether, polyoxyethylene cholesteryl ether, silicone-based surfactants such as polyether-modified silicone, sucrose fatty acid ester, glycerin fatty acid ester, alkyl saccharide, alkyl glyceryl ether such as isostearyl glyceryl ether, sorbitan fatty acid esters such as isostearic acid sorbitan and stearic acid sorbitan, etc. can be mentioned.

[0014] As the surfactant of component (B), from the viewpoint of improving the affinity when applied to the skin, and suppressing the cloudiness at the interface of each layer and making it transparent after standing still after shaking, it preferably contains one or more selected from polyether-modified silicone, glycerin fatty acid ester, alkyl glyceryl ether, and sorbitan fatty acid ester. More preferably, it contains one or more selected from alkyl glyceryl ether, glycerin fatty acid ester, and sorbitan fatty acid ester. Even more preferably, it contains one or more selected from alkyl glyceryl ether and sorbitan fatty acid ester. Even more preferably, it contains one or more selected from isostearyl glyceryl ether and sorbitan isostearate. Even more preferably, it contains sorbitan isostearate.

[0015] Component (B) can be used in combination of one or more. From the viewpoints of suppressing foaming during shaking, improving the freshness when applied to the skin, improving the affinity when applied to the skin, and suppressing the cloudiness at the interface of each layer and making it transparent after standing still after shaking, the content is preferably 0.001 to 0.5% by mass in the total composition, more preferably 0.003 to 0.3% by mass, even more preferably 0.008 to 0.12% by mass, and even more preferably 0.015 to 0.03% by mass.

[0016] In the present invention, the mass ratio (A) / (B) of component (A) to component (B) is preferably 0.001 to 10, more preferably 0.004 to 5, even more preferably 0.03 to 2, and even more preferably 0.07 to 0.7, from the viewpoints of suppressing foaming during shaking, suppressing the cloudiness at the interface of each layer and making it transparent after standing still after shaking, improving the freshness when applied to the skin, and improving the affinity when applied to the skin.

[0017] Component (C) is an oily agent that is liquid at 25°C. Here, "liquid" means that the viscosity at 25°C is 10,000 mPa·s or less. The viscosity is measured with a B-type viscometer (VISCOMETER TVB-10, manufactured by Toki Sangyo Co., Ltd.), rotor No. 4, 12 rpm, for 1 minute. Such a liquid oily agent is not limited as long as it is usually used in cosmetics, and examples include hydrocarbon oils, ester oils, ether oils, silicone oils, higher fatty acids, etc. Note that the component (C) does not contain perfume. More specifically, examples of the hydrocarbon oil include liquid paraffin, light liquid isoparaffin, liquid isoparaffin, squalane, squalene, etc. The hydrocarbon oil preferably contains one or more selected from squalane, liquid paraffin, liquid isoparaffin, and light liquid isoparaffin, more preferably contains one or more selected from squalane, liquid paraffin, and liquid isoparaffin, still more preferably contains one or more selected from squalane and liquid isoparaffin, and even more preferably contains liquid isoparaffin.

[0018] Examples of the ester oil include monoester oil, diester oil, triester oil, and tetraester oil. Examples of the monoester oil include monoesters of aliphatic or aromatic monocarboxylic acids or dicarboxylic acids having 2 to 24 carbon atoms. Specific examples include cetyl 2-ethylhexanoate, cetyl octanoate, isononyl isononanoate, isotridecyl isononanoate, hexyl laurate, isopropyl myristate, isocetyl myristate, octyldodecyl myristate, myristyl myristate, 2-hexyldecyl myristate, isopropyl palmitate, octyl palmitate, 2-hexyldecyl palmitate, butyl stearate, isocetyl stearate, isocetyl isostearate, decyl oleate, isodecyl benzoate, octyl methoxycinnamate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, 2-ethylhexyl succinate, 2-hexyldecyl adipate, alkyl (C12-C15) benzoate, and the like. The monoester oil preferably contains one or more selected from isononyl isononanoate, isotridecyl isononanoate, and isocetyl myristate, more preferably contains one or more selected from isononyl isononanoate and isocetyl myristate, and even more preferably contains isocetyl myristate.

[0019] Examples of the diester oil include diesters of dicarboxylic acids having 3 to 18 carbon atoms, di-fatty acid esters of polyhydric alcohols, and the like. Specific examples include propylene glycol dicaprylate, neopentyl glycol dicaprylate, glycol distearate, propylene glycol diisostearate, glyceryl diisostearate, glyceryl monoisostearate monomyristate, glycerin di-2-heptylundecanoate, di-2-ethylhexyl succinate, diisopropyl sebacate, diisostearyl malate, ethylene glycol di-2-ethylhexanoate, diisobutyl adipate, di-2-heptylundecyl adipate, di-2-ethylhexyl sebacate, and the like. The diester oil preferably contains one or more selected from propylene glycol dicaprylate and neopentyl glycol dicaprylate, and more preferably contains neopentyl glycol dicaprylate.

[0020] Examples of triester oils include triglycerides of polyhydric alcohols with three or more hydroxyl groups, specifically, glyceryl trimyristate, glyceryl triisopalmitate, glyceryl tri(2-heptylundecanoate), trimethylolpropane triethylhexanoate, trimethylolpropane trioctanoate, glyceryl tri(caprylic / capric acid), glyceryl trioleate, glyceryl tri(2-ethylhexanoate), glyceryl triisostearate, and further, vegetable oils such as olive oil, grape seed oil, macadamia nut oil, meadowfoam oil, castor oil, safflower oil, sunflower oil, avocado oil, canola oil, sesame oil, rice germ oil, and rice bran oil. The triester oil preferably contains one or more selected from glyceryl tri(caprylic / capric acid), glyceryl tri(2-ethylhexanoate), and vegetable oils, more preferably contains one or more selected from glyceryl tri(caprylic / capric acid), glyceryl tri(2-ethylhexanoate), olive oil, grape seed oil, macadamia nut oil, and meadowfoam oil, still more preferably contains one or more selected from glyceryl tri(caprylic / capric acid), macadamia nut oil, and olive oil, and even more preferably contains olive oil.

[0021] Examples of tetraester oils include tetra-fatty acid esters of polyhydric alcohols with four or more hydroxyl groups, specifically, pentaerythritol tetra(behenate / benzoate / ethylhexanoate), pentaerythritol tetraethylhexanoate, pentaerythritol tetraoctanoate, pentaerythritol tetra(2-ethylhexanoate), and ascorbyl tetrahexyldecanoate.

[0022] The ester oil preferably contains monoester oil.

[0023] Examples of ether oils include dialkyl ethers, specifically, dihexyl ether, dicaprylyl ether, cetyl-1,3-dimethylbutyl ether, and the like.

[0024] Examples of silicone oils include volatile and non-volatile linear dimethylpolysiloxanes such as dimethylpolysiloxane (1 cs), dimethylpolysiloxane (1.5 cs), dimethylpolysiloxane (2 cs), dimethylpolysiloxane (6 cs), dimethylpolysiloxane (10 cs), dimethylpolysiloxane (50 cs); branched siloxanes such as methyltrimethicone, tris(trimethylsilyl)methylsilane, tetrakis(trimethylsilyl)silane; cyclic dimethylsiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, crosslinked methylpolysiloxane, network methylpolysiloxane, methylphenylpolysiloxanes such as dimethylpolysiloxane, methyltrimethicone, dimethylcyclopolysiloxane, diphenylsiloxyphenyltrimethicone, and higher alcohol-modified organopolysiloxane. The silicone oil preferably contains one or more selected from linear dimethylpolysiloxanes and branched siloxanes, more preferably contains linear dimethylpolysiloxanes, and even more preferably contains non-volatile linear dimethylpolysiloxanes.

[0025] Examples of higher fatty acids include oleic acid, isostearic acid, undecylenic acid, etc.

[0026] From the viewpoints of improving the freshness when applied to the skin, improving the compatibility when applied to the skin, and suppressing foaming during shaking, the oil agent of component (C) preferably contains one or more selected from hydrocarbon oils, ester oils, and silicone oils, and more preferably contains one or more selected from hydrocarbon oils, monoester oils, and silicone oils.

[0027] Component (C) can be used alone or in combination of two or more. From the viewpoints of improving the freshness when applied to the skin, improving the affinity when applied to the skin, and suppressing foaming during shaking, the content is preferably 0.1 to 30% by mass, more preferably 0.5 to 25% by mass, and even more preferably 1.5 to 11% by mass in the total composition.

[0028] As the electrolyte of component (D), any electrolyte can be used as long as it is commonly used in ordinary cosmetics. Inorganic acids and their salts, organic acids having 6 or less carbon atoms and their salts are preferred. Examples of inorganic acids include hydrochloric acid, nitric acid, nitrous acid, sulfuric acid, sulfurous acid, phosphoric acid, phosphonic acid, phosphinic acid, etc. It is preferably included one or more selected from hydrochloric acid, sulfuric acid, and phosphoric acid. Examples of salts of inorganic acids include sodium chloride, potassium chloride, calcium chloride, magnesium chloride, aluminum chloride, potassium dihydrogen phosphate, disodium hydrogen phosphate, etc. It is preferably included one or more selected from sodium chloride, potassium chloride, potassium dihydrogen phosphate, and disodium hydrogen phosphate. More preferably, it is included one or more selected from sodium chloride, potassium dihydrogen phosphate, and disodium hydrogen phosphate. Even more preferably, it contains sodium chloride. Moreover, as the organic acids having 6 or less carbon atoms and their salts, water-soluble organic acids and their salts are preferred. Examples include fatty acids, hydroxy acids, dicarboxylic acids, acidic amino acids having 1 to 6 carbon atoms and their salts. Among these, it is preferably included one or more selected from malic acid, lactic acid, citric acid, succinic acid, acetic acid, tartaric acid, glutamic acid, aspartic acid, adipic acid and their salts. More preferably, it is included one or more selected from malic acid, lactic acid, citric acid, succinic acid and their salts. Even more preferably, it is included one or more selected from citric acid, succinic acid and their salts. Even more preferably, it contains succinic acid and its salts.

[0029] Component (D) can be used alone or in combination of two or more. From the viewpoints of improving the freshness when applied to the skin, improving the affinity when applied to the skin, suppressing foaming during shaking, suppressing turbidity at the interface of each layer and making it transparent after standing still after shaking, the content is preferably 0.1 to 1.5% by mass in the total composition, more preferably 0.19 to 1% by mass, and even more preferably 0.28 to 0.68% by mass.

[0030] In the present invention, the mass ratio (A) / (D) of component (A) to component (D) is preferably 0.0001 to 0.2, more preferably 0.0004 to 0.1, even more preferably 0.0016 to 0.022, and still even more preferably 0.004 to 0.009 from the viewpoints of improving the freshness when applied to the skin, improving the affinity when applied to the skin, suppressing foaming during shaking, suppressing turbidity at the interface of each layer and making it transparent after standing still after shaking.

[0031] From the viewpoint of improving the freshness when applied to the skin, the water content of component (E) is preferably 60 to 99% by mass in the total composition, more preferably 70 to 95% by mass, and even more preferably 75 to 90% by mass.

[0032] The multi-layer cosmetic of the present invention can further contain (F) polyol. Polyol is a compound having two or more hydroxyl groups in the molecule, and any polyol can be used as long as it is used in ordinary cosmetics. Examples of the dihydric alcohol include polyethylene glycols such as ethylene glycol, diethylene glycol, triethylene glycol, and polyethylene glycol 1540; propylene glycol, dipropylene glycol, tripropylene glycol, polypropylene glycol; 1,3-butylene glycol; propane diol; pentane diol; and the like. Examples of the trihydric alcohol include glycerin and trimethylolpropane. Examples of the tetrahydric alcohol include diglycerin and erythritol. Examples of the polyhydric alcohol having five or more valences include polyglycerins such as triglycerin; saccharides and sugar alcohols such as glucose, maltose, maltitol, sucrose, xylitol, sorbitol, maltitol, and polyoxyethylene methyl glucoside such as methyl gluceth-20, polyoxyethylene ethyl glucoside, and polyoxyethylene propylene glucoside.

[0033] As the polyol of the component (F), from the viewpoints of suppressing the cloudiness at the interface of each layer and making it transparent after standing after shaking, and improving the familiarity when applied to the skin, it preferably contains one or more selected from propylene glycol, dipropylene glycol, 1,3-butylene glycol, propane diol, polyethylene glycol, polypropylene glycol, glycerin, diglycerin, and polyoxyethylene methyl glucoside; more preferably contains one or more selected from propylene glycol, dipropylene glycol, 1,3-butylene glycol, propane diol, glycerin, diglycerin, and polyoxyethylene methyl glucoside; still more preferably contains one or more selected from propylene glycol, dipropylene glycol, 1,3-butylene glycol, propane diol, and glycerin, and polyoxyethylene methyl glucoside; even more preferably contains one or more selected from dipropylene glycol, 1,3-butylene glycol, propane diol, glycerin, and polyoxyethylene methyl glucoside; and most preferably contains one or more selected from propane diol, glycerin, and polyoxyethylene methyl glucoside.

[0034] Component (F) can be used alone or in combination of two or more. From the viewpoints of suppressing turbidity at the interface of each layer and making it transparent after standing still after shaking, and improving the affinity when applied to the skin, the content is preferably 2 to 25% by mass, more preferably 3 to 15% by mass, and still more preferably 5 to 12% by mass in the total composition.

[0035] In addition to the above components, the multi-layer cosmetic of the present invention can contain components used in ordinary cosmetics, for example, oily components other than the component (C), surfactants other than the components (A) and (B), humectants other than the component (F), ethanol, ultraviolet absorbers, ultraviolet scattering agents, thickeners, sequestering agents, antioxidants, antibacterial agents, preservatives, antiperspirants, drugs, powders, colorants, fragrances, animal and plant extracts, etc. These components are not limited to their uses as each agent, and can be diverted to other uses according to the purpose. For example, an antiperspirant can be used as a fragrance, or can be used in combination with other uses, for example, used as having the effects of an antiperspirant and a fragrance.

[0036] From the viewpoints of suppressing foaming during shaking, suppressing turbidity at the interface of each layer and making it transparent after standing still after shaking, improving the freshness when applied to the skin, and improving the affinity when applied to the skin, the content of the oil phase containing components (B) and (C) in the multi-layer cosmetic of the present invention is preferably 0.1 to 30% by mass, more preferably 0.5 to 25% by mass, still more preferably 1.5 to 10% by mass, and even more preferably 1.8 to 5% by mass in the total composition.

[0037] From the viewpoints of suppressing foaming during shaking, suppressing turbidity at the interface of each layer and making it transparent after standing still after shaking, improving the freshness when applied to the skin, and improving the affinity when applied to the skin, the content of the aqueous phase containing components (A), (D) and (E) in the multi-layer cosmetic of the present invention is preferably 70 to 99.9% by mass, more preferably 89 to 99.5% by mass, still more preferably 90 to 98.5% by mass in the total composition.

[0038] In the present invention, the mass ratio of the oil phase to the aqueous phase, (oil phase) / (aqueous phase), is preferably from 0.003 to 0.6, more preferably from 0.007 to 0.43, and even more preferably from 0.015 to 0.13, from the viewpoints of suppressing foaming during shaking, suppressing cloudiness at the interface of each layer and making it transparent after standing following shaking, improving the freshness when applied to the skin, and improving the compatibility when applied to the skin.

[0039] The multi-layer cosmetic of the present invention can be produced by appropriately mixing predetermined components. For example, an oil phase can be prepared by mixing all the oily components including components (B) and (C), an aqueous phase can be prepared by mixing all the aqueous components including components (A), (D) and (E), and it can be produced by mixing the oil phase and the aqueous phase at a predetermined ratio.

[0040] The multi-layer cosmetic of the present invention is preferably liquid, and preferably each layer is transparent when standing. Transparent means that when the multi-layer liquid cosmetic is placed in a transparent glass container and characters are placed on the back, the characters can be clearly seen when observed from the front.

[0041] The multi-layer cosmetic of the present invention has an oil phase containing at least components (B) and (C) and an aqueous phase containing at least components (A), (D) and (E) in a state of being immiscible with each other when standing, maintaining a multi-layer separation state of two or more layers, and can be made into a uniform dispersion state by shaking during use and gradually return to the original multi-layer separation state. For example, a two-layer cosmetic composed of an oil layer - an aqueous layer can be mentioned. The multi-layer cosmetic of the present invention has at least an oil layer and an aqueous layer. In this case, when standing, an oil layer is present on the opening side (upper side) of the container and an aqueous layer is present on the bottom side (lower side) of the container. The multi-layer cosmetic of the present invention is suitable as a skin cosmetic, and a lotion is more preferred.

Examples

[0042] Examples 1 to 10, Comparative Examples 1 to 4 A two-layer cosmetic having the composition shown in Table 1 was manufactured, and the freshness during application, the ease of spreading during application, the cloudiness at the oil-water interface, and the foaming were evaluated. The results are shown together with Table 1.

[0043] (Manufacturing method) All the aqueous components containing components (A), (D) and (E) were mixed at 25°C to obtain a transparent aqueous phase composition in which the components were uniformly dissolved. All the oily components containing components (B) and (C) were mixed at 25°C to obtain a transparent oil phase composition in which the components were uniformly dissolved. A two-layer cosmetic was manufactured by filling the obtained aqueous layer composition and oil layer composition in an arbitrary mass ratio into one container.

[0044] (Evaluation method) (1) Freshness during application: Three professional evaluators evaluated the freshness when applying 10 μL of each cosmetic to the back of the hand according to the following criteria. Freshness means that there is a refreshing feeling when applied to the skin and no stickiness or remaining feeling of the cosmetic is felt. The evaluation results were shown as the total score of the three people. 5: Clearly fresh. 4: Fresh. 3: Slightly fresh. 2: Not very fresh. 1: Not fresh.

[0045] (2) Ease of spreading during application: Three professional evaluators evaluated the ease of spreading when applying 10 μL of each cosmetic to the back of the hand according to the following criteria. Ease of spreading means that the contact angle when the cosmetic is placed on the skin is small and it spreads and penetrates quickly into the skin. The evaluation results were shown as the total score of the three people. 5: Clearly spreads well. 4: Spreads well. 3: Slightly spreads well. 2: Slightly spreads poorly. 1: Spreads poorly.

[0046] (3) Cloudiness at the oil-water interface: Each cosmetic material was filled into a transparent PET container (manufactured by Yoshino Kogyosha, B5754, 120 mL) so that the total amount was 100 g. Then, holding the PET container with one hand, it was firmly shaken up and down 15 times at a speed of one round trip per second, and then left standing for 24 hours. After that, when observing the PET container from an upper oblique 45-degree direction, the state of the oil-water interface was evaluated according to the following criteria. 4: Transparent. 3: Semi-transparent. 2: There is a mixture of a turbid part and a semi-transparent part. 1: Clearly turbid.

[0047] (4) Foaming: Each cosmetic material was filled into a transparent PET container (manufactured by Yoshino Kogyosha, B5754, 120 mL) so that the total amount was 100 g. Then, holding the PET container with one hand, it was firmly shaken up and down 15 times at a speed of one round trip per second. Five minutes later, when observing the PET container from an upper oblique 45-degree direction, the state of the gas-liquid interface was evaluated according to the following criteria. 4: There are no bubbles, or there are a small amount of bubbles at the edge of the container. 3: There are thin bubbles, but there are also bubble-free regions mixed in. 2: The entire gas-liquid interface is covered with thin bubbles. 1: The entire gas-liquid interface is covered with thick bubbles.

[0048]

Table 1

[0049] *1 Sorbitan isostearate: Span 120-LQ-(RB) (manufactured by Croda Europe), HLB 4.7, *2 Dimethylpolysiloxane (6 cs): Silicone KF-96A-6CS (manufactured by Shin-Etsu Chemical Co., Ltd.), *3 Liquid isoparaffin: Pearl Rim EX (manufactured by NOF Corporation), *4 Isocetyl myristate: ICM-R (manufactured by Nippon Fine Chemical Co., Ltd.), *5 PEG-12 Dimethicone: DOWSIL SS-2804 (manufactured by Dow Chemical Company), HLB 13.0, *6 PEG-20 Glyceryl Isostearate: M Fine Oil ISG-20M (manufactured by Miyoshi Oil & Fat Co., Ltd.), *7 Sodium Chloride: Pharmaceutical Excipient Raw Material Standard Sodium Chloride (manufactured by Tomita Pharmaceutical Co., Ltd.), *8 Succinic Acid: Succinic Acid (manufactured by Nippon Shokubai Co., Ltd.), *9 Glycerin: RG·Co·K (manufactured by NOF Corporation), *10 Propanediol: ZEMEA SELECT Propanediol (manufactured by Primient Covation LLC), *11 Methylgluceth-20: Macbiobride MG-20E(MS) (manufactured by NOF Corporation)

[0050] Formulation Examples 1 - 6 In the same manner as in Examples 1 - 10, two-layer cosmetics having the compositions shown in Tables 2 - 7 were manufactured. All of the two-layer cosmetics of Formulation Examples 1 - 6 are such that foaming is suppressed upon shaking, and after standing, the interface between each layer is not turbid but transparent, and when applied to the skin, it is moist and has good skin affinity.

[0051]

Table 2

[0052]

Table 3

[0053]

Table 4

[0054]

Table 5

[0055]

Table 6

[0056]

Table 7

[0057] *1 Sorbitan isostearate: Span 120-LQ-(RB) (manufactured by Croda Europe), HLB 4.7, *12 PEG-11 methyl ether dimethicone: Silicone KF-6011 (manufactured by Shin-Etsu Chemical Co., Ltd.), HLB 14.5, *13 PEG-12 dimethicone: DOWSIL SS-2804 (manufactured by The Dow Chemical Company), *14 Isostearyl glyceryl ether: Penetol GE-IS (manufactured by Kao Corporation)

Claims

1. The following components (A) to (E): (A) A silicone surfactant having an HLB of 10 or more and 20 or less, (B) A surfactant having an HLB of 2 or more and less than 10, (C) An oil agent that is liquid at 25°C, (D) An electrolyte, (E) Water A multilayer cosmetic containing the same.

2. The multilayer cosmetic according to Claim 1, wherein the mass ratio (A) / (B) of component (A) to component (B) is 0.001 to 10.

3. The multilayer cosmetic according to Claim 1 or 2, wherein component (A) is contained in the total composition in an amount of 0.00005 to 0.04% by mass.

4. The multilayer cosmetic according to Claim 1 or 2, wherein component (B) is contained in the total composition in an amount of 0.001 to 0.5% by mass.

5. The multilayer cosmetic according to Claim 1, wherein the mass ratio (A) / (D) of component (A) to component (D) is 0.0001 to 0.2.

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