Multi-layer separated cosmetic

Abstract

To provide a novel three-phase cosmetic having a water layer and an oil layer as liquid layers while allowing superior redispersion of a sedimented layer (powder) following shaking.SOLUTION: A three-layer cosmetic comprises the following components (a) to (e), separates into three layers: a water layer, an oil layer, and a sedimented layer, from top to bottom under stationary conditions, and is employed with shaking dispersion upon use. (a) A water-swellable clay mineral. (b) An aqueous solvent containing 15 mass% or more of ethanol. (c) A hydrophobically treated metal oxide. (d) A silylated anhydrous silica. (e) An oil agent.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a three-layer type cosmetic that separates into three layers, an aqueous layer, an oil layer, and a sediment layer from the upper layer when standing, and is used by shaking and dispersing during use.

Background Art

[0002] As one of the dosage forms of cosmetics containing powder, there is a two-layer type in which a liquid layer and a powder layer are separated, and it is used after gently shaking during use. Such a two-layer separation type cosmetic has the advantages of easy aesthetic appearance and a smooth feeling of the powder, and has been used as a astringent lotion, a sunscreen cosmetic, etc. (for example, see Patent Documents 1 to 3). However, when using a powder with high aggregability such as fine particle metal oxide, there is a problem that the sedimented powder aggregates and hardens during standing storage, making it difficult to redisperse. Therefore, many studies have been made on the redispersibility of powder in multi-layer type cosmetics.

[0003] On the other hand, in cosmetics, from the viewpoints of solubility of active ingredients and usability, although there is a great advantage in containing both an aqueous component and an oily component in the liquid layer, as a multi-layer separation type cosmetic in which a powder layer separates, it has been difficult to control the layer separation state after shaking and has not been realized.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention provides a novel three-layer cosmetic that has an aqueous layer and an oil layer as liquid layers and is excellent in the redispersibility of the sediment layer (powder) after shaking. **Means for Solving the Problems**

[0006] As a result of intensive research to solve the above problems, the present inventor has found that by combining an aqueous layer containing a water-swellable clay mineral and an oil layer containing a hydrophobized metal oxide and a silylated anhydrous silicic acid to form a multi-layer composition, the sediment layer containing powder has excellent redispersibility, and thus completed the present invention.

[0007] That is, the present invention provides the following. A three-layer cosmetic containing the following components (a) to (e), which separates into three layers of an aqueous layer, an oil layer, and a sediment layer from the upper layer when standing, and is used by shaking and dispersing during use. (a) Water-swellable clay mineral (b) An aqueous solvent containing 15% by mass or more of ethanol (c) Hydrophobized metal oxide (d) Silylated anhydrous silicic acid (e) Oil agent **Effects of the Invention**

[0008] The three-layer cosmetic of the present invention separates into three layers: a transparent two-layer liquid layer and a sediment layer containing powder, and has aesthetic appearance. In addition, it is excellent in the redispersibility of the sediment layer containing the metal oxide, and has an excellent smooth feeling in use. Furthermore, even when using fine particle metal oxide, the sediment layer has high redispersibility and excellent ultraviolet ray protection effect. Therefore, it is useful as an ultraviolet ray protection cosmetic. **Modes for Carrying Out the Invention**

[0009] Hereinafter, the present invention will be specifically described. In this specification, "~" means a range including the numerical values before and after it.

[0010] Component (a), the water-swellable clay mineral used in the present invention, is a clay mineral that has cations between its layers and has the property of swelling in water by expanding the interlayer spacing of the clay mineral due to the interaction between water and cations. It is not particularly limited as long as it is usually used in cosmetics. Specifically, smectite-type clay minerals such as bentonite, montmorillonite, heidellite, hectorite, saponite, and stibnite, kaolin, and swelling mica introduced with fluorine can be mentioned. It may be either naturally derived or synthetic, and one or more of these can be used. In the present invention, component (a), together with component (c) and component (d) described later, forms a sediment layer containing a small amount of water in the oil layer, thereby preventing the aggregation of powders and contributing to the improvement of the redispersibility of the sediment layer. Therefore, among these, from the viewpoint of the redispersibility of the sediment layer, bentonite and silicic acid (Al / Mg) are preferably used. Examples of commercially available products include Kunipia G-4, Kunipia G-10, and Smecton-SA (all manufactured by Kunimine Industries Co., Ltd.).

[0011] The content of component (a) in the present invention is not particularly limited. However, from the viewpoint of the redispersibility of the sediment layer, as the lower limit, 0.05% by mass (hereinafter simply referred to as “%”) or more in the total amount of the cosmetic is preferably used, more preferably 0.1% or more, and even more preferably 0.2% or more. As the upper limit, from the viewpoint of the feeling of use, 2% or less is preferably used, more preferably 1% or less, and even more preferably 0.5% or less. Further, 0.05 to 2% is preferably used, 0.1 to 1% is more preferably used, and it is particularly preferably in the range of 0.2 to 0.5%. Within this range, the sediment layer does not aggregate and has good redispersibility, which is preferable.

[0012] Component (b) used in the present invention is an aqueous solvent containing 15% or more of ethanol in the total aqueous solvent. The aqueous solvent is not particularly limited as long as it is usually used in cosmetics, and any water and solvent components soluble in water may be used. In the present invention, ethanol imparts an appropriate sense of coolness and a smooth feeling on the back of the skin, and by containing it in a specific ratio in the aqueous solvent, an aqueous layer can be prepared to be the upper layer. The content of ethanol in the aqueous solvent is 15% or more as the lower limit, preferably 30% or more, more preferably 45% or more, and preferably 85% or less, more preferably 75% or less, still more preferably 65% or less as the upper limit. The range is preferably 15 to 85%, more preferably 30 to 75%, and still more preferably 45 to 65%. Examples of water include raw water, pure water, tap water, tap water, natural water, hydrogen water, deep ocean water, hot spring water, lavender water, orange flower water, and other plant-derived steam-distilled water, and one or more of these can be used. Examples of the solvent component soluble in water include glycols such as propylene glycol, 1,3-butylene glycol, dipropylene glycol, and polyethylene glycol, and glycerols such as glycerin, diglycerin, and polyglycerin. Among these aqueous solvents, water is preferred. For example, it is preferable to contain water and ethanol in the aqueous solvent in a mass ratio (water:ethanol) in the range of 1:0.2 to 3, more preferably 1:0.5 to 2, and still more preferably 1:1 to 1.5.

[0013] The content of component (b) in the present invention is not particularly limited, but from the viewpoint of usability and the like, 25 to 40% in the total amount of the cosmetic is preferred.

[0014] Component (c) hydrophobically treated metal oxide used in the present invention is obtained by hydrophobically treating the surface of metal oxide particles by a known technique. The metal oxide is not particularly limited as long as it is usually used in cosmetics, and may be any shape such as spherical, plate-like, needle-like, spindle-like, etc., particle diameter such as fine particles, pigment grade, particle structure such as porous or non-porous, etc., and any of them may be used. The metal oxide has an action of coloring the skin, imparting hiding power, or imparting ultraviolet shielding ability in cosmetics. Specific components include, for example, zinc oxide, titanium oxide, cerium oxide, iron oxide, chromium oxide, zirconium oxide, aluminum oxide, etc., and one or more of these can be used. Among these, from the viewpoint of ultraviolet protection effect, it is preferably one or more selected from the group consisting of zinc oxide, titanium oxide, and cerium oxide. Further, the metal oxides may be used in combination by complexing them with each other, and metal elements of divalent or higher trace elements, for example, iron, zirconium, calcium, manganese, magnesium, yttrium, etc., can be contained in the metal oxide alone or in an appropriate combination of two or more and used.

[0015] The average particle size of the metal oxide is not particularly limited, but preferably 1 nm or more, more preferably 3 nm or more, still more preferably 5 nm or more as the lower limit, and preferably 1 μm or less, more preferably 500 nm or less, still more preferably 300 nm or less as the upper limit. Among these, from the viewpoints of redispersibility, coloring on the skin, imparting hiding power, etc., as the lower limit, 10 nm or more is preferable, 20 nm or more is more preferable, 30 nm or more is even more preferable, and the range is preferably 10 nm to 1 μm, more preferably 20 nm to 500 nm, and even more preferably 30 to 300 nm. Commercially available products of such metal oxides with an average particle size include, in the case of titanium oxide, TIPAQUE CR-50 (manufactured by Ishihara Sangyo Co., Ltd., average particle size 0.25 μm), TIPAQUE PFC 407 (manufactured by Ishihara Sangyo Co., Ltd., average particle size 0.25 μm), FTL-100 (manufactured by Ishihara Sangyo Co., Ltd., needle-shaped, fiber length 0.168 μm, fiber diameter 0.13 μm), MT-700B (average particle size 0.8 μm), MP-1133 (average particle size 0.25 μm), MP-40 (average particle size 0.4 μm), MP-100 (average particle size 1 μm), etc. (above, manufactured by Tayca Corporation), ST-705SA (manufactured by Titanium Industry Co., Ltd., sea urchin-shaped, average particle size 0.25 μm), SOLAVEIL XTP-1 (manufactured by Clariant Corporation, average particle size 0.14 μm), etc. In the case of zinc oxide, XZ-300F (manufactured by Sakai Chemical Industry Co., Ltd., hexagonal plate-shaped, average particle size 300 nm), XZ-1000F (manufactured by Sakai Chemical Industry Co., Ltd., hexagonal plate-shaped, average particle size 1000 nm), etc. In the case of cerium oxide, CERIGUARD W-500 (manufactured by Daito Kasei Co., Ltd., average particle size 1800 nm), etc. In the case of iron oxide, TAROX series (manufactured by Titanium Industry Co., Ltd., various P or HP or CS grades: R-516P, YP1200P, BL-100P, R-516CS, LL-100CS, ABL-205CS, etc. or their composite powders), FESOIE series (manufactured by Titanium Industry Co., Ltd.), SUN PURO series (C33-8001, C33-9001, C33-7001 (manufactured by Sun Chemical Corporation)), UNIPURE series (manufactured by Sensient Corporation), etc.

[0016] Also, from the viewpoints of redispersibility and ultraviolet ray shielding effect, it is preferably a fine particle metal oxide, and the upper limit value of its average particle diameter is preferably 100 nm or less, more preferably 50 nm or less, and even more preferably 30 nm or less. As the range, it is preferably 1 nm to 100 nm, more preferably 3 nm to 50 nm, and even more preferably 5 nm to 30 nm. The average particle diameter means a value measured by volume average particle diameter (D50) using a laser scattering type particle size distribution analyzer (manufactured by HORIBA, Ltd.). In the case of an asymmetric shape, in the present invention, D50 obtained from the largest particle diameter distribution is defined as the average particle diameter.

[0017] As commercially available products of fine particle metal oxides having such an average particle diameter range, examples of zinc oxide include FINEX-25, FINEX-50, FINEX-75 (manufactured by Sakai Chemical Co., Ltd.), MZ500 series, MZ700 series (manufactured by Teika Co., Ltd.), ZnO-350 (manufactured by Sumitomo Osaka Cement Co., Ltd.), and the like. As titanium oxide, TTO-55 series, TTO-51 series (manufactured by Ishihara Sangyo Co., Ltd.), JR series, JA series (manufactured by Teika Co., Ltd.), and the like are commercially available. Examples of cerium oxide include high-purity cerium sold by Nitsuki Co., Ltd. or Seimi Chemical Co., Ltd.

[0018] The hydrophobizing agent for performing the hydrophobizing treatment of the component (c) used in the present invention is not particularly limited as long as it can impart hydrophobicity to the surface of the metal oxide particles. Examples thereof include silicone treating agents, fluorine treating agents, organic titanate treating agents, fatty acid treating agents, lecithin treating agents, amino acid treating agents, acylated amino acid treating agents, and the like, and one or more of these can be used. Among these, from the viewpoint of redispersibility, one or more selected from silicone treating agents, organic titanate treating agents, fatty acid treating agents, and acylated amino acid treating agents are preferable, and one or more selected from silicone treating agents, organic titanate treating agents, and fatty acid treating agents are particularly preferable.

[0019] Examples of silicone treating agents include linear silicones such as low-polymerization-degree dimethylpolysiloxane, high-polymerization-degree dimethylpolysiloxane, and methylphenylpolysiloxane; modified silicones such as amino-modified silicone, alkyl-modified silicone, and alkoxy-modified silicone; silicone resins such as trimethylsiloxysilicic acid and acrylic-silicone graft copolymers; silicone rubbers; partially or fully crosslinked organopolysiloxanes; silylating agents; silane coupling agents; etc. One or more of these can be used. The silane coupling agent is not particularly limited, but trialkoxyalkylsilane is preferred. Trialkoxyalkylsilane is a compound in which three alkoxy groups and one alkyl group are bonded to a silicon atom, and it is a compound that chemically modifies the powder surface by the reaction of the alkoxy group with a hydroxyl group or the like on the powder surface. In the trialkoxyalkylsilane, the alkoxy group is preferably methoxy, ethoxy, propoxy, etc., which are alkoxy groups having 1 to 3 carbon atoms. Also, in the trialkoxyalkylsilane, the alkyl group is preferably a hexyl group, octyl group, decyl group, octadecyl group, etc., which are alkyl groups having 6 to 18 carbon atoms. Such trialkoxyalkylsilanes include, for example, trimethoxyhexylsilane, trimethoxyoctylsilane, trimethoxydecylsilane, trimethoxyoctadecylsilane, triethoxyhexylsilane, triethoxyoctylsilane (OTS), triethoxydecylsilane, triethoxyoctadecylsilane, etc. Among these, one or more selected from the group consisting of trimethoxyoctylsilane and triethoxyoctylsilane (OTS) are more preferred.

[0020] Examples of the organic titanate treating agent include alkyl titanates such as long-chain carboxylic acid type, pyrophosphoric acid type, phosphorous acid type, and amino acid type, and alkyl titanates having an alkyl group with 8 to 24 carbon atoms are preferred. Specifically, examples of the alkyl titanate include isopropyltriisostearoyl titanate (ITT), isopropyltrioctanoyl titanate, isopropyldimethacrylisostearoyl titanate, isopropylisostearoyldiacryl titanate, and diisostearoylethylene titanate as long-chain carboxylic acid type alkyl titanates; tetraisopropylbis(dioctyl phosphite) titanate, tetraoctylbis(ditridecyl phosphite) titanate, and tetra(2,2-diallyloxymethyl-1-butyl)bis(ditridecyl phosphite) titanate as pyrophosphoric acid type alkyl titanates; isopropyltri(dioctyl pyrophosphate) titanate, bis(dioctyl pyrophosphate)oxyacetate titanate, and bis(dioctyl pyrophosphate)ethylene titanate as phosphorous acid type alkyl titanates; and isopropyltri(N-amidoethyl·aminoethyl) titanate as amino acid type alkyl titanates. In the present invention, among these alkyl titanates, long-chain carboxylic acid type alkyl titanates are preferred, and isopropyltriisostearoyl titanate (ITT) is more preferred.

[0021] Examples of the fatty acid treating agent include fatty acids and their metal salts. Among them, those having 12 to 18 carbon atoms in the fatty acid are preferred from the viewpoint of redispersibility and the like. Examples of the salts include calcium, magnesium, zinc, aluminum, etc., and aluminum salts are preferred. Among these, myristic acid and its metal salts are particularly preferred.

[0022] The method for hydrophobizing the component (c) is not particularly limited and can be carried out by a generally known method. For example, the hydrophobizing agent and the metal oxide to be treated are added to a solvent, stirred with a ball mill or the like, dried if necessary, washed with water and filtered repeatedly to remove impurities, and then dried and pulverized to obtain the target hydrophobized metal oxide. Also, several types of compounds that are hydrophobizing agents can be surface-treated simultaneously, or surface-treatment can be performed with one of the compounds first and then with other compounds. The treatment amount of the hydrophobizing agent with respect to the metal oxide is not particularly limited, but 1 to 20% is preferable, and 3 to 15% is more preferable.

[0023] The content of the component (c) in the present invention is not particularly limited, but from the viewpoints of usability and UV protection effect, as the lower limit, 0.5% or more, more preferably 5% or more, and still more preferably 10% or more in the total amount of the cosmetic is preferable. As the upper limit, 30% or less is preferable, 25% or less is more preferable, and 20% or less is still more preferable. Also, 0.5 to 30% is preferable, 5 to 25% is more preferable, and it is preferably in the range of 10 to 20%.

[0024] The component (d), silylated anhydrous silicic acid used in the present invention, is obtained by subjecting anhydrous silicic acid usually used in cosmetics to dimethylsilylation treatment with dimethyldichlorosilane, trimethylsilylation treatment with trimethylchlorosilane or hexamethyldisilazane, octylsilylation treatment with octyltrichlorosilane, etc. In the present invention, the component (d), together with the components (a) and (c), forms a sediment layer holding a small amount of water in the oil layer, thereby preventing aggregation of the powder and contributing to improvement of the redispersibility of the sediment layer.

[0025] The specific surface area of the component (d) is not particularly limited, but in terms of redispersibility and the like, 50 to 380 m 2 / g is preferable, and 90 to 200 m 2 / g is more preferable. The method for measuring the specific surface area is not particularly limited, and it can be measured according to a known method such as the BET method. The average particle diameter of component (d) is not particularly limited, but is preferably 5 to 50 nm, and more preferably 5 to 20 nm. The average particle diameter herein refers to the volume average particle diameter, and is obtained by spherical conversion of the average value of the projected areas of transmission electron microscope (TEM) photographs (obtained for at least 100 particles or more). Commercially available products of component (d) include AEROSIL R972, AEROSIL R974, AEROSIL R976S (manufactured by Nippon Aerosil Co., Ltd.), and the like.

[0026] The content of component (d) in the present invention is not particularly limited, but from the viewpoint of redispersibility and the like, the lower limit is preferably 0.1% or more, and more preferably 0.5% or more. The upper limit is preferably 5% or less, and more preferably 3% or less. Further, 0.1 to 5% is preferable, and the range of 0.5 to 3% is more preferable. Within this range, the sedimentation layer does not aggregate and has good redispersibility, which is preferable.

[0027] The component (e) oil agent used in the present invention can be used without particular limitation as long as it is an oil agent commonly used in cosmetics, regardless of the origin such as animal oil, vegetable oil, synthetic oil, etc. or the properties such as semi-solid oil, liquid oil, volatile oil, etc., and hydrocarbons, fats and oils, ester oils, silicone oils, fatty acids, higher alcohols, fluorine-based oils, etc. can be used. Specifically, hydrocarbon oils such as liquid paraffin, squalane, petrolatum, polyisobutylene, light liquid isoparaffin, isododecane; vegetable fats and oils such as olive oil, castor oil, mink oil, macadamia nut oil, avocado oil, meduform oil;Jojoba oil, propylene glycol dicaprate, isocetyl isostearate, trimethylolpropane triisostearate, alkyl benzoate, ethylene glycol di-2-ethylhexanoate, neopentyl glycol di-2-ethylhexanoate, pentaerythritol tetra-2-ethylhexanoate, cetyl 2-ethylhexanoate, oleyl oleate, octyldodecyl oleate, decyl oleate, neopentyl glycol dicaprate, triethyl citrate, 2-ethylhexyl succinate, isocetyl stearate, butyl stearate, diisopropyl sebacate, di-2-ethylhexyl sebacate, cetyl lactate, myristyl lactate, isopropyl palmitate, 2-ethylhexyl palmitate, 2-hexyldecyl palmitate, 2-heptylundecyl palmitate, dipentaerythritol fatty acid ester, isononyl isononanoate, isotridecyl isononanoate, isopropyl myristate, isopropyl palmitate, 2-octyldodecyl myristate, 2-hexyldecyl myristate, myristyl myristate, hexyldecyl dimethyloctanoate, ethyl laurate, hexyl laurate, 2-ethylhexyl methoxycinnamate, diisostearyl malate, glyceryl tri-2-ethylhexanoate, glyceryl tri(caprylic / capric)ate, glyceryl tricaprate, glyceryl triisostearate, diglyceryl diisostearate, diglyceryl triisostearate, diglyceryl tetraisostearate, decaglyceryl decaisostearate, glyceryl triisopalmitate, glyceryl trimyristate, diglyceryl myristate isostearate, tritridecyl trimellitate, phytosteryl oleate, N-lauroyl-L-glutamic acid 2-octyldodecyl ester, N-lauroyl-L-glutamic acid di(phytostearyl·2-octyldodecyl), and other ester oils; silicone oils such as low-polymerization-degree dimethylpolysiloxane, high-polymerization-degree dimethylpolysiloxane, methylphenylpolysiloxane, decamethylcyclopentasiloxane, octamethylcyclotetrasiloxane, and fluorine-modified organopolysiloxane; fatty acids such as stearic acid, lauric acid, myristic acid, isostearic acid, and oleic acid;Higher alcohols such as oleyl alcohol, isostearyl alcohol, octyldodecanol, and decyltetradecanol; fluorinated oil agents such as perfluorodecane, perfluorooctane, and perfluoropolyether; lanolin derivatives such as lanolin acetate, isopropyl lanolin fatty acid, and lanolin alcohol; and the like. One or more of these can be used, but from the viewpoints of redispersibility and feel in use, it is preferable to contain one or more selected from the group consisting of isononyl isononanoate, isotridecyl isononanoate, propylene glycol dicaprate, alkyl benzoate, cetyl 2-ethylhexanoate, dimethylpolysiloxane with a low degree of polymerization, and phytosteryl oleate.;

[0028] In the present invention, component (e) preferably contains an ultraviolet absorber. The ultraviolet absorber that can be contained in component (e) is an oil-soluble organic ultraviolet absorber. Specifically, it includes ethylhexyl methoxycinnamate, hexyl 2-[4-(diethylamino)-2-hydroxybenzoyl]benzoate, ethyl para-aminobenzoate, benzophenone-1, benzophenone-3, benzophenone-6, benzophenone-9, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, dioctyl butamide triazone, 4-tert-butyl-4'-methoxy-dibenzoylmethane, 2,4-bis{[4-(2-ethyl-hexyloxy)-2-hydroxy]-phenyl}-6-(4-methoxyphenyl)-(1,3,5)-triazine, 2,2'-methylenebis[6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol], polysilicone-15, and the like. One or more of these can be used.

[0029] Although the content of component (e) in the present invention is not particularly limited, from the viewpoint of usability and the like, 30 to 65% of the total amount of the cosmetic is preferable. From the viewpoint of the ultraviolet ray protection effect, it is preferable to contain 1 to 12% of an oil-soluble organic ultraviolet absorber as component (e) in the total amount of the cosmetic, and more preferably 3 to 10%. Even if about 10% of the oil-soluble organic ultraviolet absorber is blended in the cosmetic in this way, the ultraviolet ray protection effect can be further enhanced without impairing the redispersibility and the smooth usability.

[0030] In the present invention, further, component (f), zinc paraphenolsulfonate, can be contained. Component (f) is contained in the sediment layer of the three-layer cosmetic of the present invention together with components (c) and (d). Component (f) is generally a deodorant component used in the fields of cosmetics and pharmaceuticals, and has antibacterial action, bactericidal action, antiperspirant action and the like. Examples of commercially available products of component (f) include zinc sulfocarbolate (manufactured by Matsumoto Fine Chemical Co., Ltd.).

[0031] Although the content of component (f) in the present invention is not particularly limited, from the viewpoint of exerting the antiperspirant effect, as the lower limit, 0.1% or more, more preferably 0.3% or more, in the total amount of the cosmetic is preferable. As the upper limit, 2% or less, more preferably 1% or less, is preferable. Further, 0.1 to 2% is preferable, and 0.3 to 1% is more preferable.

[0032] In addition to the above components, the three-layer cosmetic of the present invention can contain components usually used in cosmetics within a range not impairing the effects of the present invention. For example, powders other than components (c) and (d), surfactants, water-soluble polymers, film formers, fragrances, moisturizers, antibacterial agents, deodorants, chelating agents, pH adjusters, cooling agents, plant extracts, vitamins, beauty components and the like can be contained.

[0033] The manufacturing method of the three - layer cosmetic of the present invention is not particularly limited and can be manufactured by mixing the above - mentioned essential components and optional components according to a conventional method. For example, powders such as components (c) and (d) are dispersed in a part of (e), and the remaining component (e) is added, followed by heating and mixing to prepare a dispersion. After mixing and heating a part of components (a) and (b) to uniformly dissolve (a), the dispersion is added thereto and dispersion treatment is carried out. After cooling, the remaining part of component (a) is added and further cooled, and then filled into a container and allowed to stand for a certain time. Then, the three - layer cosmetic of the present invention separated into three layers of an aqueous layer, an oil layer, and a sediment layer from the upper layer can be obtained.

[0034] The use of the three - layer cosmetic of the present invention is not particularly limited, but it can be suitably used as a cosmetic for ultraviolet protection, antiperspirant, etc.

[0035] This technology can appropriately adopt the following configurations or technical features. [1] A three - layer cosmetic containing the following components (a) to (e), which separates into three layers of an aqueous layer, an oil layer, and a sediment layer from the upper layer during standing and is used by shaking and dispersing during use. (a) Water - swellable clay mineral (b) An aqueous solvent containing 15% by mass or more of ethanol (c) Hydrophobically treated metal oxide (d) Silylated anhydrous silicic acid (e) Oil agent [2] The three - layer cosmetic according to [1], further containing component (f) zinc parahydroxybenzenesulfonate. [3] The three - layer cosmetic according to [1] or [2], wherein the component (e) contains an ultraviolet absorber. [4] The three - layer cosmetic according to any one of [1] to [3], wherein the content of component (a) in the total amount of the cosmetic is 0.05 - 2% by mass, and the content of component (d) is 0.1 - 5% by mass. [5] The three - layer cosmetic according to any one of [1] to [4], which is an ultraviolet - protecting cosmetic.

Example

[0036] Hereinafter, the present invention will be described more specifically with reference to examples and the like, but the present invention is not limited to the following examples and the like at all.

[0037] Examples 1 to 15 and Comparative Examples 1 to 5: Antiperspirant Cosmetics Antiperspirants of Examples and Comparative Examples were prepared by the composition shown in Table 1 and the production method shown below. For each of the obtained samples, evaluation and determination were carried out according to the evaluation methods and criteria shown below for each evaluation item of redispersibility of the sediment layer, UV protection effect, and smoothness, and the results are also shown in Table 1.

[0038]

Table 1

[0039] *1 Kunipia G-4 (manufactured by Kunimine Industries Co., Ltd.) *2: Smeton-SA (manufactured by Kunimine Industries Co., Ltd.) *3: ITT-3 SIRS-5 MZ-500 (average particle diameter 25 nm) (manufactured by Daito Kasei Kogyo Co., Ltd.) *4: MZX-300M (average particle diameter 35 nm) (manufactured by Teika Co., Ltd.) *5: SMT-500SAM (average particle diameter 35 nm) (manufactured by Teika Co., Ltd.) *6: MZY-508OTS (average particle diameter 25 nm) (manufactured by Teika Co., Ltd.) *7: SAMT-UFZO-450 / D5 (60%) MiBrid Dispersion (average particle diameter 50 nm) (manufactured by Miyoshi Kasei Kogyo Co., Ltd.) (content in the table is in terms of solid content) *8: MZ-500 (average particle diameter 25 nm) (manufactured by Teika Co., Ltd.) *9: AEROSIL R972 (BET specific surface area 90 - 130 m 2 / g) (manufactured by Nippon Aerosil Co., Ltd.) *10: AEROSIL 380S (BET specific surface area 350 - 410 m 2 / g) (manufactured by Nippon Aerosil Co., Ltd.)

[0040] (Production Method) A: Perform roller treatment on Components 6 to 13 and a part of Component 17 to prepare a dispersion. B: Add Component 14 - 16 and the remaining Component 17 to A, heat to 80°C, and disperse uniformly. C: Heat Components 1 - 3 and Component 5 to 80°C and dissolve uniformly. D: Add C to B and disperse at 3000 rpm using a disperser. E: Cool D to 45°C with stirring, add Component 4, and further cool to 28°C. F: Quickly fill E into a container, let it stand overnight to obtain a three - layer antiperspirant cosmetic.

[0041] 〔Evaluation Method 1〕Redispersibility Each sample was filled into a 60 - ml resin bottle (diameter 4 cm) and stored statically in a 50°C constant - temperature bath for 1 month. Then, each sample returned to room temperature was held in hand and shaken up and down using the forearm at a speed of about 2 reciprocations per second, and the number of reciprocations until the sediment layer was uniformly dispersed was measured. Then, the determination was made according to the following determination criteria (a).

[0042] (a) Determination Criteria [Determination]: [Evaluation] ◎: Dispersed within 10 shakes and became a uniform solution. ○: Dispersed within 11 - 30 shakes and became a uniform solution. ×: Did not disperse even after 30 shakes and did not become a uniform solution.

[0043] 〔Evaluation Method 2〕UV Protection Effect Each sample was applied to a PMMA plate (HELIOPLATE HD6 manufactured by Labsphere) at 2 mg / cm 2 After application and 20 - minute standing, SPF measurement was performed on the sample using an SPF analyzer (UV - 2000S manufactured by Labsphere). The sample was measured at 10 points, the average SPF value of each sample was calculated, and the determination was made according to the following determination criteria (b).

[0044] (b) Determination Criteria [Determination]: [Average SPF Value] ◎: 25 or more ○: 15 or more and less than 25 ×: Less than 15

[0045] 〔Evaluation Method 3〕Smooth feeling Sensory evaluation was conducted by 20 professional panelists for cosmetics evaluation. Each sample filled in a bottle container was shaken 5 times during use, and then about 5 ml (about one tablespoon) was taken in one hand and applied to the opposite forearm for use. The smooth feeling of the finish was evaluated according to the following evaluation criteria (a). Then, the average score of all panelists was calculated and judged according to the following judgment criteria (b). (a) Evaluation criteria [Score]: [Evaluation result] 5 points: Very good 4 points: Slightly good 3 points: Ordinary (can't say either way) 2 points: Slightly poor 1 point: Poor (b) Judgment criteria [Judgment]: [Average score of scores] ◎: 4.5 points or more ○: 3.5 points or more and less than 4.5 points △: 2.0 points or more and less than 3.5 points ×: Less than 2.0 points

[0046] The three-layer antiperspirant cosmetics obtained as Examples 1 to 15 were separated into three layers: two transparent liquid layers and a fluffy sediment layer, and were excellent in the aesthetic property of the appearance. Also, as is clear from the results in Table 1, the three-layer antiperspirant cosmetics of Examples 1 to 15 were excellent in the redispersibility of the sediment layer, ultraviolet protection effect, and smooth feeling. On the other hand, Comparative Example 1 that did not contain component (a) was not excellent in redispersibility, sunblock effect, and non-stickiness. Comparative Example 2 in which the ethanol content in the aqueous solvent of component (b) was less than 15%, Comparative Example 3 that contained untreated zinc oxide instead of component (C), Comparative Examples 4 and 5 that did not contain component (D) or were replaced with untreated anhydrous silicic acid were all inferior in redispersibility, sunblock effect, and non-stickiness.

Claims

Claim 1 A three-layered cosmetic containing the following components (a) to (e), which separates into three layers, an aqueous layer, an oil layer, and a sediment layer, from the upper layer when left standing, and is used by shaking and dispersing during use. (a) A water-swellable clay mineral (b) An aqueous solvent containing 15% by mass or more of ethanol (c) A hydrophobized metal oxide (d) Silylated anhydrous silicic acid (e) An oil agent Claim 2 The three-layered cosmetic according to Claim 1, further containing component (f) zinc paraphenolsulfonate. Claim 3 The three-layered cosmetic according to Claim 1 or 2, wherein the component (e) contains an ultraviolet absorber. Claim 4 The three-layered cosmetic according to Claim 1 or 2, wherein the content of the component (a) in the total amount of the cosmetic is 0.05 to 2% by mass, and the content of the component (d) is 0.1 to 5% by mass. Claim 5 The three-layered cosmetic according to Claim 1 or 2, which is an ultraviolet protection cosmetic.

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