Oil-in-water type emulsion cosmetic

Abstract

Provided is an oil-in-water type emulsion cosmetic wherein an oil agent that is solid at 25°C and has an IOB value of 0.2-0.8 can be stably mixed with the liquid oil-in-water type emulsion cosmetic, and which has excellent use feelings such as non-stickiness, a resilient feeling, and a penetrating feeling. This oil-in-water type emulsion cosmetic comprises (A) an oil agent that is solid at 25°C and has an IOB value of 0.2-0.8, (B) an oil agent that is liquid at 25°C and has an HSP distance Ra from the component (A) of 7.0 or less, (C) one or more lipids selected from the group consisting of phospholipids and lysophospholipids, and (D) one or more alcohols selected from among ethanol and polyhydric alcohols having IOB values of 1.5-5. Emulsified droplets of the oil-in-water type emulsion cosmetic have an average droplet diameter of 400 nm or less.

Description

Oil-in-water emulsion cosmetics

[0001] The present invention relates to an oil-in-water emulsion cosmetic.

[0002]

[0003] Technologies relating to cosmetics containing various solid oils stably blended as solid oil active ingredients for cosmetics or topical skin preparations, or to impart a firming feeling, have been disclosed. However, when solid oils are blended into oil-in-water emulsion cosmetics or aqueous cosmetics, precipitation of the solid oils and creaming of the emulsions are likely to occur, posing problems in terms of stabilization. Furthermore, the solid oils are likely to become sticky, posing problems in terms of usability. In response to these problems, technologies have been disclosed that stably blend glycyrrhetinic acid derivatives into emulsion compositions by combining fatty acid esters having 10 to 18 carbon atoms with water-soluble surfactants, etc. (see, for example, Patent Document 1); that stably blend solid oils such as cholesterol, phytosterols, and stearyl glycyrrhetinate into cosmetics by incorporating them into liposomes (see, for example, Patent Document 2); and that stably blend stearyl glycyrrhetinate into emulsion compositions with excellent usability by combining a specific ester oil with an alkyl-modified carboxyvinyl polymer (see, for example, Patent Document 3).

[0003] JP 2013-224290 A JP 2023-32103 A JP 2013-173728 A

[0004] However, the technology relating to emulsion compositions in Patent Document 1 requires a surfactant, resulting in stickiness. In addition, cosmetics are obtained by preparing an emulsion composition that can ensure stability over time only at a low temperature of 4°C, and then blending only a small amount of this emulsion composition. This is insufficient from the perspective of high-temperature stability for the stable blending of solid oils such as stearyl glycyrrhetinate. The technology relating to cosmetic compositions in Patent Document 2 targets liposomes, and therefore has the problem of being unable to blend oily ingredients sufficiently. The technology relating to emulsion compositions in Patent Document 3, while excellent in terms of usability, such as non-stickiness and firmness, requires a water-soluble polymer as a viscosity modifier, and has not previously focused on stable blending in low-viscosity liquids such as lotions, which have better penetration. In particular, when blending amphiphilic solid oils such as stearyl glycyrrhetinate, cholesterol, or ceramide into oil-in-water emulsion compositions, the solid oils tend to orient at the emulsion interface, resulting in poor stability, such as gelation, making stable blending even more difficult.

[0005] The main object of the present invention is to obtain an oil-in-water emulsion cosmetic that can be stably blended with a liquid oil-in-water emulsion cosmetic that has an IOB value of 0.2 to 0.8 and is solid at 25°C, and that has an excellent feel when used, such as non-stickiness, firmness, and penetration.

[0006] As a result of extensive research, the present inventors have found that by preparing an oil-in-water emulsion cosmetic by selecting an oil based on the Hansen solubility parameter (HSP) and emulsifying it, it is possible to obtain a cosmetic that has an IOB value of 0.2 to 0.8, is remarkably excellent in terms of the stable blending of an oil that is solid at 25°C, and has a good feel when used, such as non-stickiness, firmness, and penetration.

[0007] That is, the present invention is as described below. [1] Provided is an oil-in-water emulsion cosmetic comprising: (A) an oily agent that is solid at 25°C and has an IOB value of 0.2 to 0.8; (B) an oily agent that is liquid at 25°C and has an HSP distance Ra from component (A) of 7.0 or less; (C) one or more members selected from the group consisting of phospholipids and lysophospholipids; and (D) one or more members selected from the group consisting of ethanol and polyhydric alcohols having an IOB value of 1.5 to 5, wherein the average particle size of the emulsion droplets is 400 nm or less. [2] Provided is the oil-in-water emulsion cosmetic according to [1], wherein component (C) comprises a lysophospholipid. [3] The oil-in-water emulsion cosmetic according to [1] or [2], wherein the mass ratio (C) / {(A) + (B)} of the content of component (C) to the total content of component (A) and component (B) is 0.03 to 1.0. [4] The oil-in-water emulsion cosmetic according to [1] or [2], wherein the content of component (D) is 5 to 40 mass% with respect to the total amount of the oil-in-water emulsion cosmetic. [5] The oil-in-water emulsion cosmetic according to [1] or [2], further comprising component (E) erythritol. [6] The oil-in-water emulsion cosmetic according to [1] or [2], wherein the viscosity at 30°C is 1 to 4,000 mPa s. [7] The oil-in-water emulsion cosmetic according to [1] or [2], wherein the sheet material is coated with or impregnated with the oil-in-water emulsion cosmetic.

[0008] The oil-in-water emulsion cosmetic of the present invention is capable of stably containing an oil agent that has an IOB value of 0.2 to 0.8 and is solid at 25°C, and therefore has an excellent firmness, and because fine emulsion droplets can be prepared, it has a penetrating feel and a non-sticky feel when used, and has excellent stability over time.

[0009] Preferred embodiments of the present invention will be described in detail. However, the present invention is not limited to the following preferred embodiments and can be freely modified within the scope of the present invention. In this specification, percentages are expressed on a mass basis unless otherwise specified. In addition, in this specification, when a numerical range is expressed using "to" the range includes both ends of the numerical range.

[0010] Component (A) used in the present invention is an oil agent that has an IOB value of 0.2 to 0.8 and is solid at 25° C. Here, "solid at 25° C." means that it has no fluidity at 25° C. and atmospheric pressure, and includes not only a solid state at 25° C. and atmospheric pressure, but also a semi-solid state that has no fluidity at 25° C. and atmospheric pressure but becomes fluid when a certain force or more is applied.

[0011] The component (A) used in the present invention may be a single component or a combination of two or more components in any ratio. When two or more components (A) are used, each component must have an IOB value of 0.2 to 0.8 and be solid at 25°C.

[0012] Component (A) used in the present invention is not particularly limited as long as it is an oily agent that has an IOB value of 0.2 to 0.8 and is solid at 25° C. Examples of such oily agents include ultraviolet absorbers such as bisethylhexyloxyphenol methoxyphenyl triazine (IOB value=0.43), diethylaminohydroxybenzoyl hexyl benzoate (IOB value=0.68), and t-butylmethoxydibenzoylmethane (IOB value=0.47), as well as stearyl glycyrrhetinate (IOB value=0.33), ceramide NG (IOB value=0.46), ceramide NP (IOB value=0.70), cholesterol (IOB value=0.35), and phytosterols (IOB value=0.30 to 0.35). Examples of commercially available products include TINOSORB S (manufactured by BASF), Phytosterol QI (manufactured by Tama Biochemical Co., Ltd.), Nissui Marine Cholesterol (manufactured by Nippon Suisan Co., Ltd.), CERAMIDE 2 (manufactured by Croda Japan Co., Ltd.), and CERAMIDE 3 (manufactured by Cosmopharm Co., Ltd.). Here, the IOB value refers to the ratio of the inorganic value (IV) to the organic value (OV) in the organic conceptual diagram, i.e., "inorganic value (IV) / organic value (OV)" (see Atsushi Fujita's Organic Conceptual Diagram: "The Domain of Chemistry," Vol. 11, No. 10 (1957), pp. 719-725).

[0013] Component (A) used in the present invention can be suitably used in the present invention, even if it would be difficult to incorporate it into an oil-in-water emulsion cosmetic having an average emulsion droplet size of 400 nm or less using conventional techniques. The component (A) used in the present invention preferably has an IOB value of 0.25 or more, more preferably 0.3 or more, from the viewpoints of a good firmness and lack of stickiness, and preferably 0.5 or less, more preferably 0.4 or less, from the viewpoint of lack of gelation or precipitation. In this case, the IOB value refers to the IOB value of that component (A) when there is only one component (A), and refers to the IOB value of each component (A) when there are two or more components (A).

[0014] As component (A) used in the present invention, solid oils having a steroid skeleton (cholesterol, phytosterol) such as cholesterol, phytosterol, or stearyl glycyrrhetinate, or a triterpene skeleton (stearyl glycyrrhetinate) are preferred, with stearyl glycyrrhetinate being particularly preferred. These components can exhibit superior effects in terms of preventing gelation or precipitation. Here, stearyl glycyrrhetinate is a compound obtained by esterifying stearic acid to the hydroxyl group of glycyrrhetinic acid obtained by hydrolysis of glycyrrhetinic acid contained in licorice, etc. The systematic name is octadecyl (20S)-3β-hydroxy-11-oxo-5α-olean-12-en-29-oate, and the molecular formula is C ４８ H ８２ O ４ The molecular structure of glycyrrhetinic acid is planar, and the 3- and 11-positions are similar to cortisone, so it has an anti-inflammatory effect. Stearyl glycyrrhetinate is a compound with stearic acid added, and can be used as an anti-inflammatory ingredient in technical fields such as external skin preparations and cosmetics, where safety is required.

[0015] The content of component (A) used in the present invention is not particularly limited, but the lower limit is preferably 0.001% by mass (hereinafter referred to as %) or more, more preferably 0.01% or more, and even more preferably 0.1% or more, relative to the total amount of the oil-in-water emulsion cosmetic. The upper limit is preferably 10% or less, more preferably 5% or less, and even more preferably 3% or less. The range is preferably 0.001 to 10%, more preferably 0.01 to 5%, and even more preferably 0.1 to 3%. This range is more preferable in terms of the absence of gelation or precipitation, a good firmness, and a lack of stickiness.

[0016] Component (B) used in the present invention is not particularly limited as long as it is an oily agent that has a Hansen Solubility Parameter (HSP) distance Ra from component (A) of 7.0 or less and is liquid at 25° C. Here, liquid at 25° C. means that it has fluidity at 25° C. and atmospheric pressure.

[0017] Here, the Hansen solubility parameter (also referred to as "HSP") is a value used to predict the solubility of a substance, which was published by Charles M. Hansen in 1967, and is a parameter based on the idea that "two substances with similar intermolecular interactions are likely to dissolve in each other." HSP is a parameter that is calculated by the following three parameters (unit: MPa １／２) δd: Energy due to intermolecular dispersion forces δp: Energy due to intermolecular dipole interactions δh: Energy due to intermolecular hydrogen bonds These three parameters can be considered as coordinates in a three-dimensional space (Hansen space). When the HSPs of two substances are placed in Hansen space, the closer the distance between the two points, the more easily they dissolve in each other. In other words, HSP can be used as an indicator of affinity. HSPs are explained in detail in the March 2010 issue of Kagaku Kogyo (Kagaku Kogyosha), and the HSPs of various substances can be obtained using the computer software "HSPiP: Hansen Solubility Parameters in Practice" or the like. The present disclosure uses HSPs obtained using this computer software "HSPiP: Hansen Solubility Parameters in Practice" version 5.3.02.

[0018] Furthermore, the Hansen solubility parameter (HSP) distance Ra can be calculated using the Ra calculation function of "HSPiP: Hansen Solubility Parameters in Practice" and can also be expressed as follows: That is, when the coordinates of the HSP of component X are (δdX, δpX, δhX), the HSP distance Ra (unit: MPa) between the coordinates of the HSP of component Y (δdY, δpY, δhY) is: １／２ ) can be calculated by the following formula:

[0019] In the component (B) used in the present invention, when the coordinates of the HSP of the component (A) are (δda, δpa, δha), the coordinates of the HSP of the component (B) (δdb, δpb, δhb) satisfy the following formula:

[0020] The component (B) used in the present invention may be one type, or two or more types may be used in combination in any ratio. When two or more types of component (B) are used, each of them must have an HSP distance Ra of 7.0 or less with respect to component (A) and be a liquid oil at 25°C. When two or more types of component (A) are used, it is sufficient that the HSP distance Ra with respect to any of the components (A) is 7.0 or less.

[0021] The oil agent that is liquid at 25°C is not particularly limited, and any oil agent that is used in ordinary cosmetics may be used. When the HSP distance Ra between the oil agent and component (A) is calculated, one that is 7.0 or less can be used as component (B).

[0022] Examples of oils that are liquid at 25° C. include hydrocarbon oils, ester oils, silicone oils, natural animal and vegetable oils, and semi-synthetic oils.

[0023] The hydrocarbon oil may be either linear or branched, and may be either volatile or non-volatile. Examples of the hydrocarbon oil include isododecane, squalane, synthetic squalane, vegetable squalane, mineral oil (liquid paraffin), isoparaffin, and hydrogenated polyisobutene.

[0024] Ester oils include isobutyl isostearate, decyl isostearate, methylheptyl isostearate, tricyclodecanemethyl isononanoate, heptyl undecylenate, behenyl erucate, cetyl octanoate, stearyl caprylate, polyglyceryl-3 diisostearate, neopentyl glycol diisononanoate, neopentyl glycol diethylhexanoate, octyl stearate, octyldodecyl stearate, diethylhexyl sebacate, dibutyloctyl sebacate, glyceryl tribehenate, and ethylhexyl palmitate. Syl, methylheptyl palmitate, dipentaerythrityl hexaisononanoate, myreth-3 myristate, methylheptyl myristate, caprylyl laurate, methylheptyl laurate, trioleyl phosphate, tricetyl phosphate, diethylhexyl carbonate, oleyl erucate, isostearyl isostearate, hexyldecyl isostearate, oleyl oleate, isocetyl stearate, isostearyl palmitate, octyldodecyl myristate, isostearyl myristate, isocetyl myristate, isodecyl oleate, oleic acid, Decyl stearate, Octyldodecyl stearoyl stearate, Cetearyl isononanoate, Cetyl caprate, Ethylhexyl stearate, Stearyl heptanoate, Cetyl ethylhexanoate, Hexyldecyl ethylhexanoate, Octyldodecyl neopentanoate, Octyl palmitate, Butyl stearate, Isostearyl neopentanoate, Isopropyl isostearate, Ethyl isostearate, Isotridecyl isononanoate, PG distearate, Isocetyl stearoyl stearate, PG diisostearate, Dioleic acid PG, glycol dioleate, glycol distearate, pentaerythrityl tetraisostearate, trimethylolpropane triisostearate, isopropyl palmitate, polyglyceryl-2 tetraisostearate, hexyl laurate, cetyl acetate, isodecyl isononanoate, ethylhexyl isononanoate, PEG-3 trimethylolpropane tristearate, tridecyl neopentanoate, isopropyl myristate, isoamyl laurate, PEG-3 trimethylolpropane triisostearate, isononyl isononanoate,PEG-3 glyceryl triisostearate, isodecyl neopentanoate, PEG-2 distearate, PEG-4 glyceryl tristearate, cetyl ricinoleate, dicaprylyl carbonate, PEG-2 diisostearate, PEG-2 dioleate, neopentyl glycol dicaprate, dioctyldodecyl stearoyl glutamate, polyglyceryl-2 triisostearate, diisostearyl malate, glyceryl diisostearate, ceteth-3 stearate, Examples of such glyceryl triisostearate include PEG-4 sorbitan triisostearate, PEG-5 glyceryl triisostearate, PEG-3 distearate, PEG-3 diisostearate, PEG-6 glyceryl tristearate, PEG-5 trimethylolpropane trimyristate, steareth-4 stearate, PEG-3 dipalmitate, PEG-4 distearate, pentaerythrityl tetraethylhexanoate, and triethylhexanoin.

[0025] Examples of silicone oils include methylphenylpolysiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, methyltrimethicone, polyether-modified methylpolysiloxane, oleyl-modified methylpolysiloxane, polyvinylpyrrolidone-modified methylpolysiloxane, octamethylcyclotetrasiloxane, dodecamethylcyclohexasiloxane, hexamethyldisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, caprylyl trimethicone, methylphenylpolysiloxane, and dimethiconol.

[0026] Examples of natural animal and vegetable oils and semi-synthetic oils include rapeseed oil, meadowfoam oil, and jojoba seed oil.

[0027] As described above, the substance corresponding to component (B) varies depending on component (A). For example, when component (A) is stearyl glycyrrhetinate, examples of component (B) include pentaerythrityl tetraethylhexanoate (Ra=2.81), squalane (Ra=5.28), mineral oil (Ra=3.80), triethylhexanoin (Ra=3.69), isostearic acid (Ra=5.20), ethylhexyl methoxycinnamate (Ra=3.59), jojoba seed oil (Ra=4.05), hydrogenated polydecene (Ra=4.9), ethyl oleate (Ra=4.15), olive fruit oil (Ra=3.57), etc. When component (A) is phytosterol, examples of component (B) include pentaerythrityl tetraethylhexanoate (Ra=1.89), squalane (Ra=4.53), mineral oil (Ra=2.88), triethylhexanoin (Ra=1.54), isostearic acid (Ra=2.50), ethylhexyl methoxycinnamate (Ra=2.33), octyldodecanol (Ra=4.59), jojoba seed oil (Ra=2.60), hydrogenated polydecene (Ra=4.29), ethyl oleate (Ra=2.16), and olive fruit oil (Ra=1.61). When component (A) is cholesterol, examples of component (B) include pentaerythrityl tetraethylhexanoate (Ra=2.36), squalane (Ra=5.00), mineral oil (Ra=3.37), triethylhexanoin (Ra=1.69), isostearic acid (Ra=2.43), ethylhexyl methoxycinnamate (Ra=1.88), octyldodecanol (Ra=4.22), jojoba seed oil (Ra=3.03), hydrogenated polydecene (Ra=4.77), ethyl oleate (Ra=2.33), and olive fruit oil (Ra=1.97). When component (A) is ceramide NG, examples of component (B) include triethylhexanoin (Ra=5.49), isostearic acid (Ra=4.98), ethylhexyl methoxycinnamate (Ra=4.13), octyldodecanol (Ra=3.22), ethyl oleate (Ra=5.71), and olive fruit oil (Ra=6.34).When component (A) is ceramide NP, examples of component (B) include triethylhexanoin (Ra = 6.17), isostearic acid (Ra = 5.73), ethylhexyl methoxycinnamate (Ra = 4.56), octyldodecanol (Ra = 3.92), and ethyl oleate (Ra = 6.40). When component (A) is bisethylhexyloxyphenol methoxyphenyl triazine, examples of component (B) include ethylhexyl methoxycinnamate (Ra = 6.31), octyldodecanol (Ra = 6.40), and the like. When component (A) is diethylaminohydroxybenzoyl hexyl benzoate, examples of component (B) include ethylhexyl methoxycinnamate (Ra = 5.06), octyldodecanol (Ra = 6.27), and the like. When component (A) is t-butyl methoxydibenzoylmethane, component (B) may be ethylhexyl methoxycinnamate (Ra=4.88), etc.

[0028] The component (B) used in the present invention has an HSP distance Ra of 7.0 or less with respect to the component (A). From the viewpoint of preventing gelation and precipitation, Ra is preferably 4.5 or less, more preferably 3.0 or less. The lower limit of the HSP distance Ra is not particularly limited and may be 0. When two or more components (B) are used in the present invention, it is preferable that any one of the components (B) satisfies the preferred range for the HSP distance Ra, and it is more preferable that all of the components (B) satisfies the preferred range for the HSP distance Ra. When two or more components (A) are used in the present invention, it is preferable that any one of the components (A) has a component (B) that satisfies the preferred range for the HSP distance Ra, and it is more preferable that all of the components (A) have a component (B) that satisfies the preferred range for the HSP distance Ra.

[0029] Table 1 shows the HSP distance Ra between each component (A) and an oil that is liquid at 25°C.

[0030]

[0031] The content (mass) of component (B) used in the present invention is not particularly limited, but the lower limit is preferably 0.1% or more, more preferably 1% or more, and even more preferably 2% or more, relative to the total amount of the oil-in-water emulsion cosmetic. The upper limit is preferably 15% or less, more preferably 10% or less, and even more preferably 5% or less. The range is preferably 0.1 to 15%, more preferably 1 to 10%, and even more preferably 2 to 5%. This range is preferable in terms of the absence of gelation or precipitation, the absence of creaminess, the absence of stickiness, and the feeling of penetration.

[0032] The mass ratio of the content of any one of the components (A) used in the present invention (hereinafter referred to as "specific component (A)") to the content of component (B) (hereinafter referred to as "specific component (B)") having an HSP distance Ra of 7.0 or less relative to the specific component (A) [content of specific component (A) / content of specific component (B)] is not particularly limited, but the lower limit is preferably 0.001 or more, more preferably 0.01 or more. The upper limit is preferably 1.0 or less, more preferably 0.7 or less, and even more preferably 0.5 or less. The range is preferably 0.001 to 1.0, more preferably 0.01 to 0.7, and even more preferably 0.01 to 0.5. This range is more preferable in terms of the absence of gelation or precipitation, the absence of stickiness, and the firmness.

[0033] In calculating the mass proportions, when the present invention uses one type of component (A) and one type of component (B), the content of the specific component (A) is the content of that one type of component (A), and the content of the specific component (B) is the content of that one type of component (B). Also, when the present invention uses one type of component (A) and two or more types of components (B), the HSP distance Ra of any of the components (B) to that one type of component (A) is 7.0 or less, so the content of the specific component (A) is the content of that one type of component (A), and the content of the specific component (B) is the total content of all of the components (B).

[0034] When two or more types of component (A) are used in the present invention, it is preferable that at least one type of component (A) satisfies the above-mentioned preferred conditions regarding the lower limit, upper limit and range for the mass ratio between this component (A) and a component (B) (specific component (B)) having an HSP distance Ra of 7.0 or less relative to this component (A), and it is even more preferable that all of the components (A) satisfy the above-mentioned preferred conditions regarding the lower limit, upper limit and range for the mass ratio between each of the components (A) and a component (B) (specific component (B)) having an HSP distance Ra of 7.0 or less relative to the respective component (A).

[0035] The component (C) used in the present invention is one or more selected from the group consisting of phospholipids and lysophospholipids. Here, the phospholipid refers to a substance having a structure in which a fatty acid and a phosphoric acid are bonded to a central skeleton of glycerin or sphingosine, and an alcohol is further ester-bonded to the phosphoric acid, and the lysophospholipid refers to a phospholipid from which one fatty acid group has been removed. Both the phospholipid and the lysophospholipid may be hydrogenated.

[0036] The component (C) used in the present invention may be one type or two or more types in combination in any ratio.

[0037] Fatty acids constituting phospholipids and lysophospholipids include saturated and unsaturated carboxylic acids having 7 to 22 carbon atoms, preferably 14 to 20 carbon atoms. Furthermore, alcohols constituting phospholipids and lysophospholipids often contain nitrogen, and examples of such alcohols include choline, ethanolamine, inositol, and serine.

[0038] The component (C) used in the present invention is not particularly limited, and components commonly used in ordinary cosmetics can be used. Examples include phospholipids (including hydrogenated phospholipids) such as soybean phospholipids, hydrogenated soybean phospholipids, egg yolk phospholipids, hydrogenated egg yolk phospholipids, sunflower phospholipids, and hydrogenated sunflower phospholipids. Component (C) may also be a lysophospholipid (including hydrogenated lysophospholipids). From the viewpoints of the absence of gelation or precipitation, the absence of creaminess, and the feeling of penetration, phospholipids (unhydrogenated), hydrogenated phospholipids, and hydrogenated lysophospholipids are preferred, and a combination of a phospholipid (unhydrogenated) and a hydrogenated lysophospholipid, or a combination of a hydrogenated phospholipid and a hydrogenated lysophospholipid, is more preferred.

[0039] Examples of commercially available phospholipids (non-hydrogenated) include J-Lecithin CLO (manufactured by J-Oil Mills Co., Ltd.), etc. Examples of commercially available hydrogenated phospholipids include Resinol S-10, Resinol S-10EZ, Resinol S-10M, Resinol S-10EX, Resinol S-PIE (all manufactured by Nikko Chemicals Co., Ltd.), COATSOME NC-21 (manufactured by NOF Co., Ltd.), Phospholipon 100H, Phospholipon 90H, Phospholipon 80H, Phospholipon 90G (all manufactured by Phospholipid Co., Ltd.), etc. Examples of commercially available hydrogenated lysophospholipids include LP70H (manufactured by Nippon Fine Chemicals), SLP-White Lyso H, and SLP-LPC 70H (all manufactured by Tsuji Oil Mills).

[0040] A mixture of phospholipids with phytosterol or cholesterol may be used as component (C) in the present invention. Commercially available products of such mixtures include PHYTOCOMPO-PP (a mixture of hydrogenated soybean phospholipids and phytosterols) (manufactured by Nippon Fine Chemicals Co., Ltd.) and COMPOSITE-PC (a mixture of hydrogenated soybean phospholipids and cholesterol) (manufactured by Nippon Fine Chemicals Co., Ltd.).

[0041] The content (mass) of component (C) used in the present invention is not particularly limited, but the lower limit of the total amount of the oil-in-water emulsion cosmetic is preferably 0.05% or more, more preferably 0.1% or more, and even more preferably 0.2% or more. The upper limit is preferably 10% or less, more preferably 5% or less, and even more preferably 3% or less. The range is preferably 0.05 to 10%, more preferably 0.1 to 5%, and even more preferably 0.2 to 3%. This range is preferable in terms of the absence of gelation or precipitation, the absence of creaminess, the absence of stickiness, and the feeling of penetration.

[0042] The mass ratio (C) / {(A)+(B)} of the content of component (C) used in the present invention to the total content of component (A) used in the present invention and component (B) used in the present invention is not particularly limited, but the lower limit is preferably 0.03 or more, more preferably 0.05 or more, and even more preferably 0.1 or more. The upper limit is preferably 1.0 or less, more preferably 0.7 or less, and even more preferably 0.3 or less. The range is 0.03 to 1.0, more preferably 0.05 to 0.7, and even more preferably 0.1 to 0.3. This range is preferable in terms of lack of creaminess, lack of stickiness, and penetration feeling. In calculating the mass ratio, when two or more types of component (A) are used in the present invention, the content of component (A) is the total of those; when two or more types of component (B) are used in the present invention, the content of component (B) is the total of those; and when two or more types of component (C) are used in the present invention, the content of component (C) is the total of those.

[0043] Component (D) used in the present invention is one or more selected from the group consisting of ethanol and polyhydric alcohols having an IOB value of 1.5 to 5. Here, the IOB value of ethanol is 2.5. Component (D) used in the present invention may be one type, or two or more types may be used in combination in any ratio. When two or more types of polyhydric alcohols are used, each polyhydric alcohol has an IOB value of 1.5 to 5.

[0044] Examples of polyhydric alcohols having an IOB value of 1.5 to 5 include propylene glycol (IOB value=3.3), dipropylene glycol (IOB value=1.8), 1,3-butylene glycol (IOB value=2.5), 1,2-pentanediol (IOB value=2.0), glycerin (IOB value=5.0), diglycerin (IOB value=3.5), and PEG-8 (MW400) (IOB value=2.3).

[0045] In view of the absence of gelation or precipitation and stickiness, ethanol, 1,3-butylene glycol, dipropylene glycol, glycerin, and diglycerin are preferred, and ethanol, 1,3-butylene glycol, and glycerin are more preferred.

[0046] The content (mass) of component (D) used in the present invention is not particularly limited, but the lower limit of the total amount of the oil-in-water emulsion cosmetic is preferably 5% or more, more preferably 10% or more, and even more preferably 15% or more. The upper limit is preferably 40% or less, more preferably 30% or less, and even more preferably 25% or less. The range is preferably 5 to 40%, more preferably 10 to 30%, and even more preferably 15 to 25%. This range is preferable in terms of the absence of gelation or precipitation, the absence of creaminess, and the feeling of penetration.

[0047] The oil-in-water emulsion cosmetic of the present invention preferably further contains component (E) erythritol. Erythritol is a type of sugar alcohol that has traditionally been used as a moisturizing agent in cosmetics, and commercially available products include Erythritol (manufactured by Bussan Food Science Co., Ltd.) and Erythritol (manufactured by Bussan Food Science Co., Ltd.).

[0048] The content (mass) of component (E) used in the present invention, relative to the total amount of the oil-in-water emulsion cosmetic, is preferably 0.01% or more, more preferably 0.1% or more, and even more preferably 0.5% or more, as a lower limit. The upper limit is preferably 15% or less, more preferably 10% or less, and even more preferably 5% or less. The range is preferably 0.01 to 15%, more preferably 0.1 to 10%, and even more preferably 0.5 to 5%. This range is more preferable in terms of non-sticky feel during use, etc.

[0049] The oil-in-water emulsion cosmetic of the present invention may contain water as a component constituting the aqueous phase (aqueous component). Examples of water include purified water, hot spring water, ion-exchanged water, deep sea water, tap water, and steam-distilled water from plants, and these may be used alone or in combination of two or more types in any ratio. The water content (mass) is not particularly limited and can be set depending on the content of other components. For example, it can be 50% or more and 90% or less of the total amount of the oil-in-water emulsion cosmetic. The aqueous component may contain a component soluble in water. The water-soluble component may be component (D).

[0050] In addition to the above-mentioned components (A) to (D), optional component (E), and water, the oil-in-water emulsion cosmetic of the present invention may contain other components within a range that does not impair the effects of the present invention. Examples of other components include components typically used in cosmetics, such as oily components as base materials or emollient components, powders, surfactants for powder dispersion or for adjusting texture, UV absorbers, moisturizers, anti-fading agents, antioxidants, antifoaming agents, cosmetic ingredients (e.g., vitamins), anti-inflammatory agents, herbal medicines, preservatives (e.g., parahydroxybenzoates, phenoxyethanol, etc.), fragrances, etc., and these may be appropriately contained within a range that does not impair the effects of the present invention.

[0051] The oily component is not particularly limited as long as it is a component other than component (A) and component (B), and components typically used in cosmetics can be used. The oily component can be of any origin and nature, and may be any of animal oil, vegetable oil, synthetic oil, etc., and may be any of solid oil, semi-solid oil, liquid oil, etc. Examples of the oily component include higher alcohols, fluorine-based oils, oily gelling agents, etc. Specific examples include silicones such as decamethylcyclopentasiloxane and fluorine-modified organopolysiloxane, fluorine-based oils such as perfluorodecane, perfluorooctane, and perfluoropolyether, and oily gelling agents such as starch fatty acid esters, 12-hydroxystearic acid, and calcium stearate.

[0052] The powder is not particularly limited, and powders typically used in cosmetics can be used. The powder is not particularly limited by shape (e.g., plate-like, spindle-like, needle-like, etc.), particle size (e.g., fine particles, pigment-grade, etc.), particle structure (e.g., porous, non-porous, etc.), and examples thereof include inorganic powders, organic powders, composite powders, etc. Specific examples include inorganic powders (e.g., silica, metal oxides, talc, sericite, etc.), organic powders (e.g., magnesium stearate, zinc stearate, N-acyl lysine, polyethylene terephthalate, nylon, polymethyl methacrylate, methylsiloxane network polymer, etc.), and composite powders (e.g., fine particle titanium oxide-containing silicon dioxide, fine particle zinc oxide-containing silicon dioxide, etc.), and the like. These may be used alone or in combination of two or more types in any ratio. These powders may be the same type or a composite of two or more types, and may be surface-treated with a fluorine compound, metal soap, surfactant, oil, hydrocarbon, etc.

[0053] As the powder, from the viewpoint of adjusting the feel, for example, powders such as silicone powder, talc, sericite, silica, mica, kaolin, calcium carbonate, aluminum oxide, polyethylene powder, polymethyl methacrylate, nylon powder, etc. are preferably used. Furthermore, from the viewpoint of imparting an ultraviolet protection effect, for example, metal oxide powders are preferably used, such as zinc oxide, titanium oxide, and cerium oxide. These may be used alone or in combination of two or more kinds in any ratio.

[0054] When the powder is surface-treated, the surface treatment method is not particularly limited, and known surface treatment methods can be used, such as silica treatment, alumina treatment, aluminum hydroxide treatment, fluorine compound treatment, silicone treatment, silicone resin treatment, pendant treatment, silane coupling agent treatment, titanium coupling agent treatment, silane treatment, oil treatment, N-acylated lysine treatment, polyacrylic acid treatment, metal soap treatment, acrylic resin treatment, and metal oxide treatment. The powder content (mass) is preferably 5% or less, and more preferably 1% or less, of the total amount of the oil-in-water emulsion cosmetic. Within this range, it is possible to impart a desired effect to the oil-in-water emulsion cosmetic while avoiding an increased squeaky feeling of the oil-in-water emulsion cosmetic.

[0055] The surfactant is not particularly limited as long as it is other than component (C), and any surfactant commonly used in cosmetics can be used, including, for example, nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants.

[0056] The ultraviolet absorber is not particularly limited as long as it is other than component (A), and those typically used in cosmetics can be used. Examples include ultraviolet absorbers such as benzophenones, PABAs, cinnamates, salicylic acids, and oxybenzones. The moisturizer is not particularly limited, and those typically used in cosmetics can be used, such as proteins, mucopolysaccharides, collagen, elastin, and keratin. The antioxidant is not particularly limited, and those typically used in cosmetics can be used, such as α-tocopherol and ascorbic acid.

[0057] The method for producing the oil-in-water emulsion cosmetic of the present invention is not particularly limited, and the cosmetic can be prepared by known methods. For example, the oil-in-water emulsion cosmetic of the present invention can be obtained by adding water and an aqueous component containing the remainder of component (D) to an oil phase prepared by heating and dissolving some or all of components (A) to (C) and component (D), emulsifying and mixing the mixture, and then subjecting the mixture to a micronization treatment using a high-pressure emulsifying and dispersing device such as a Microfluidizer, or a wet-type micronization device such as an Ultimizer or Nanovater. The processing pressure during the micronization treatment is preferably 50 to 200 MPa. When component (E) or other components are used, they can be blended at an appropriate timing.

[0058] The average particle size of the emulsion droplets in the oil-in-water emulsion cosmetic of the present invention is 400 nm or less, preferably 300 nm or less, and more preferably 250 nm or less. If the average particle size of the emulsion droplets exceeds 400 nm, the absence of creaminess will be poor and a sense of penetration will not be achieved. The lower limit of the average particle size of the emulsion droplets is not particularly limited, as the smaller the particle size, the better the absence of creaminess and the sense of penetration will be. However, it is usually 20 nm or more.

[0059] The average particle size of the emulsified droplets of the oil-in-water emulsion cosmetic of the present invention is a value measured by dynamic light scattering using a Beckman Coulter N5 Particle Analyzer. For the measurement, a sample prepared by diluting the oil-in-water emulsion cosmetic composition with water can be used. Details of the measurement conditions are as described in the Examples.

[0060] The viscosity of the oil-in-water emulsion cosmetic of the present invention is the value measured using a Brookfield rotational viscometer after storing the prepared oil-in-water emulsion cosmetic for one day at 30° C. There are no particular restrictions on the viscosity of the oil-in-water emulsion cosmetic of the present invention, but a viscosity of 1 to 4,000 mPa·s at 30° C. is preferred in terms of excellent penetration sensation, and is more preferably 1 to 3,000 mPa·s.

[0061] The oil-in-water emulsion cosmetic of the present invention can be in a liquid form, or can be made into an emulsion, cream, or other form by imparting viscosity depending on the intended use. Specifically, it can be used in basic cosmetics such as serums, lotions, emulsions, creams, sheet masks, and sunscreens, as well as makeup cosmetics such as body cosmetics, foundations, primers, concealers, and lip cosmetics. It can also be used on the skin of the face, body, hands, feet, etc., as well as hair, and can also be used as a hair mist, hair milk, or hair gel. The effects of the present invention are exhibited in skin care cosmetics such as lotions, emulsions, and sheet masks, and a liquid form is preferred in the present invention because it provides a good penetration feeling, etc.

[0062] The liquid oil-in-water emulsion cosmetic can be filled into a non-aerosol spray container or an aerosol spray container and sprayed as a mist, or can be impregnated into a nonwoven fabric and used as a sheet-like cosmetic. The oil-in-water emulsion cosmetic of the present invention can be used by directly taking it into the hands in liquid form, but it is more preferable to impregnate it into a nonwoven fabric and use it as a sheet-like cosmetic, as this provides a more firm and permeable feel.

[0063] The present invention can also employ the following configurations. <1> An oil-in-water emulsion cosmetic comprising: (A) an oil agent that is solid at 25°C and has an IOB value of 0.2 to 0.8; (B) an oil agent that is liquid at 25°C and has an HSP distance Ra from component (A) of 7.0 or less; (C) one or more members selected from the group consisting of phospholipids and lysophospholipids; and (D) one or more members selected from the group consisting of ethanol and polyhydric alcohols having an IOB value of 1.5 to 5, wherein the average particle size of the emulsion droplets is 400 nm or less. <2> The oil-in-water emulsion cosmetic according to <1> above, wherein component (C) contains a lysophospholipid. <3> The oil-in-water emulsion cosmetic according to <1> or <2> above, wherein the mass ratio of the content of component (C) to the total content of component (A) and component (B) is 0.03 to 1.0. <4> The oil-in-water emulsion cosmetic according to any one of <1> to <3> above, wherein the content of component (D) is 5 to 40 mass% relative to the total amount of the oil-in-water emulsion cosmetic. <5> The oil-in-water emulsion cosmetic according to any one of <1> to <4> above, further comprising component (E) erythritol. <6> The oil-in-water emulsion cosmetic according to any one of <1> to <5> above, wherein the viscosity at 30°C is 1 to 4,000 mPa s. <7> The oil-in-water emulsion cosmetic according to any one of <1> to <6> above, which is formed by coating or impregnating a sheet material.

[0064] The present invention will be described in detail below with reference to examples, which should not be construed as limiting the scope of the present invention.

[0065] Examples 1 to 34 and Comparative Examples 1 and 2: Oil-in-water emulsion cosmetics Oil-in-water emulsion cosmetics were prepared according to the formulations shown in Table 2 below (the total of all components being 100% by mass), and were evaluated for the absence of gelation or precipitation, absence of creaming, firmness, absence of stickiness, and penetration sensation using the evaluation methods described below. The average particle size of the emulsion droplets was measured using the following method. The results are also shown in Tables 2 to 4.

[0066]

[0067]

[0068]

[0069] (Note 1) Resinol S-10EZ (Nikko Chemicals) (Note 2) LP70H (Nippon Fine Chemicals) (Note 3) J-Lecithin CLO (J-Oil Mills) (Note 4) Phytosterol QI (Tama Biochemicals) (Note 5) Nissui Marine Cholesterol (Nippon Suisan) (Note 6) CERAMIDE 2 (Croda Japan) (Note 7) TINOSORB S (BASF) (Note 8) Erythritol (Nikken Kasei)

[0070] (Production Method) The oil-in-water emulsion cosmetics of Examples 1 to 34 and Comparative Examples 1 and 2 were prepared using the following steps. A. Heat components (1) to (9) to 70°C and mix uniformly. B. Dissolve components (10) to (21) by heating at 70°C. C. Heat component (22) to 70°C. D. Gradually add B to A and mix and disperse using a Despa mixer. E. Gradually add C to D and mix and disperse using a Despa mixer. F. Cool E to room temperature and subject to high-pressure treatment using a microfluidizer. G. Mix components (23) to (28) with F to obtain an oil-in-water emulsion cosmetic.

[0071] (Evaluation Method 1: Absence of Gelling or Precipitation) The oil-in-water emulsion cosmetics of Examples 1 to 34 and Comparative Examples 1 and 2 were left at 5°C for one month, and then returned to 25°C, and the presence or absence of gelling or precipitation of the samples was visually confirmed. <Evaluation Criteria> (Judgment): (Evaluation) A: No gelling or precipitation was observed at all B: Almost no gelling or precipitation was observed C: Gelling or precipitation was observed in samples stored at 5°C

[0072] (Evaluation Method 2: Absence of Creaming) The oil-in-water emulsion cosmetics of Examples 1 to 34 and Comparative Examples 1 and 2 were left at 50°C for one month, and then returned to 25°C, and the presence or absence of creaming in the samples was visually confirmed. <Judgment Criteria> (Judgment): (Evaluation) A: No creaming was observed B: Almost no creaming was observed C: Creaming was observed

[0073] (Evaluation Method 3: "Firmness," "Non-stickiness," and "Penetration") Twenty expert cosmetic evaluators used the oil-in-water emulsion cosmetics of Examples 1 to 34 and Comparative Examples 1 to 3, and each evaluated "firmness," "non-stickiness," and "penetration" on a scale of 1 to 5 according to the following evaluation criteria, assigning a score to each sample. The average scores of all panelists were judged according to the following criteria. <Evaluation Criteria> (Score): (Results) 5 points: Very good 4 points: Good 3 points: Neither good nor slightly poor 2 points: Slightly poor 1 point: Poor <Evaluation Criteria> (Judgment): (Average score) A: Over 4.0 to 5.0 B: Over 3.0 to 4.0 or less C: 1.0 to 3.0 or less

[0074] (Measurement method: average particle size of emulsion droplets) The oil-in-water emulsion cosmetics of Examples 1 to 34 and Comparative Examples 1 and 2 were diluted approximately 500 times with purified water to prepare samples, and the average particle size of each sample was measured by dynamic light scattering using a Beckman Coulter N5 Particle Analyzer. The measurement was performed three times at room temperature, and the average value of the three measurements was used.

[0075] As is clear from the results in Tables 2 to 4, the oil-in-water emulsion cosmetics of Examples 1 to 34 of the present invention were superior in terms of lack of gelation or precipitation, lack of creaming, firmness, lack of stickiness, and penetration feel compared to the oil-in-water emulsion cosmetics of Comparative Examples 1 and 2. Furthermore, in Comparative Examples 1 (Ra = 12.92) and 2 (Ra = 7.17), in which the HSP distance Ra between the liquid oil and component (A) at 25°C was greater than 7.0, the emulsion droplets were greater than 400 nm, and were inferior in terms of lack of gelation or precipitation, lack of creaming, and penetration feel, and were unsatisfactory.

[0076] Example 35: Lotion (mass %) 1. Hydrogenated phospholipid (Note 1) (Note 9) 0.3 2. Hydrogenated lysophospholipid (Note 2) 0.3 3. Cholesterol (Note 9) 0.05 4. 1,3-butylene glycol 6 5. Glycerin 3 6. Polyglycerin-3 (IOB = 3.0) (Note 10) 1 7. Pentaerythritol tetraethylhexanoate 2 8. Mineral oil 2 9. Phenoxyethanol 0.3 10. Polysorbate 80 (Note 11) 0.1 11. Sorbitan sesquioleate (Note 12) 0.1 12. Stearyl glycyrrhetinate 1 13. Fragrance 0.05 14. Purified water 20 15. Purified water balance 16. 16. Sodium monohydrogen phosphate 0.02 17. Sodium dihydrogen phosphate 0.02 18. Disodium edetate 0.01 19. Ethanol 8 20. Erythritol (Note 8) 3 21. Glycereth-26 (IOB=1.9) (Note 13) 5 22. Sodium hyaluronate 0.1 23. Hydrolyzed collagen 0.1 (Note 9) COMPOSITE-PC (Nippon Fine Chemical Co., Ltd.) (Note 10) PGL-S (Sakamoto Pharmaceutical Industry Co., Ltd.) (Note 11) Rheodol TW-O120V (Kao Corporation) (Note 12) Rheodol AO-15V (Kao Corporation) (Note 13) LOPONIC EG-1 (Shima Trading Co., Ltd.)

[0077] (Production Method) A. Heat components (1) to (6) to 70°C and mix uniformly. B. Heat and dissolve components (7) to (13) at 70°C. C. Heat component (14) to 70°C. D. Gradually add B to A and mix and disperse using a Despa mixer. E. Gradually add B to D and mix and disperse using a Despa mixer. F. Cool E to room temperature and subject to high-pressure treatment at 100 MPa using a Nanovater. G. Mix components (15) to (23) with F to obtain a lotion. The lotion obtained in this manner was excellent in terms of lack of gelation or precipitation, lack of creaminess, firmness, non-stickiness, and penetration. For component (A) cholesterol, the liquid oils corresponding to component (B) were pentaerythritol tetraethylhexanoate (Ra = 2.36) and mineral oil (Ra = 3.37), and the mass ratio (A) / (B) of the content of component (A) to the content of component (B) was 0.0125. For component (A) stearyl glycyrrhetinate, the liquid oils corresponding to component (B) were pentaerythritol tetraethylhexanoate (Ra = 2.81) and mineral oil (Ra = 3.80), and the mass ratio (A) / (B) of the content of component (A) to the content of component (B) was 0.25. The mass ratio (C) / {(A) + (B)} of the content of all components (C) to the total content of all components (A) and all components (B) was 0.12. The content of component (D) relative to the total amount of the lotion was 18%, and the average particle size was approximately 200 nm.

[0078] Example 36: Beauty serum (mass %) 1. Hydrogenated phospholipid (Note 14) 0.3 2. Hydrogenated lysophospholipid (Note 2) 0.3 3. Phytosterol (Note 4) (Note 14) 0.05 4. Cholesterol (Note 5) 0.05 5. 1,3-butylene glycol 6 6. Glycerin 3 7. Olive fruit oil 3 8. Squalane 1 9. Mineral oil 1 10. Phenoxyethanol 0.3 11. Stearyl glycyrrhetinate 0.8 12. Fragrance 0.05 13. Purified water 20 14. Hydroxypropyl methylcellulose (Note 15) 0.1 15. 16. Tremella Fuciformis Polysaccharide (Note 17) 0.01 17. Purified Water Remaining 18. Sodium Monohydrogen Phosphate 0.02 19. Sodium Dihydrogen Phosphate 0.02 20. Disodium Edetate 0.01 21. Ethanol 8 22. Erythritol (Note 8) 2 23. PPG-9 Diglyceryl (Note 18) 2 24. Cyclohexane-1,4-Dicarboxylic acid bisethoxydiglycol (Note 19) 0.1 25. Hydrolyzed elastin 0.2 (Note 14) PHYTOCOMPO-PP (Nippon Fine Chemicals Co., Ltd.) (Note 15) METOLOSE 65SH-15000 (Shin-Etsu Chemical Co., Ltd.) (Note 16) ADEKA NOL GT-700 (ADEKA Corporation) (Note 17) TREMOIST-TP (Nippon Fine Chemicals Co., Ltd.) (Note 18) SY-DP9 (Sakamoto Pharmaceutical Industry Co., Ltd.) (Note 19) NEOSOLUE-AQURIO (Nippon Fine Chemicals Co., Ltd.),

[0079] (Production Method) A. Heat components (1) to (6) to 70°C and mix uniformly. B. Heat and dissolve components (7) to (12) at 70°C. C. Heat component (13) to 70°C. D. Gradually add B to A and mix and disperse using a Despa mixer. E. Gradually add C to D and mix and disperse using a Despa mixer. F. Cool E to room temperature and subject to high-pressure treatment at 50 MPa using an Ultimizer. G. Mix components (14) to (25) with F to obtain a beauty serum. The beauty serum obtained in this manner was excellent in terms of lack of gelation or precipitation, lack of creaminess, firmness, non-stickiness, and penetration. For component (A) phytosterol, the liquid oils corresponding to component (B) were olive fruit oil (Ra = 1.61), squalane (Ra = 4.53), and mineral oil (Ra = 2.88), and the mass ratio (A) / (B) of the content of component (A) to the content of component (B) was 0.01. For component (A) cholesterol, the liquid oils corresponding to component (B) were olive fruit oil (Ra = 1.97), squalane (Ra = 5.00), and mineral oil (Ra = 3.37), and the mass ratio (A) / (B) of the content of component (A) to the content of component (B) was 0.01. With respect to component (A) stearyl glycyrrhetinate, the liquid oils corresponding to component (B) were olive fruit oil (Ra = 3.57), squalane (Ra = 5.28), and mineral oil (Ra = 3.80), and the mass ratio (A) / (B) of the content of component (A) to the content of component (B) was 0.16. The mass ratio (C) / {(A) + (B)} of the content of all components (C) to the total content of all components (A) and all components (B) was 0.10. The content of component (D) relative to the total amount of the serum was 17%, and the average particle size was approximately 300 nm.

[0080] Example 37: Daytime serum (mass %) 1. Phospholipid (Note 3) 0.5 2. Hydrogenated lysophospholipid (Note 2) 0.2 3. Phytoterol (Note 4) 0.05 4. 1,3-butylene glycol 5 5. Glycerin 5 6. Jojoba seed oil 5 7. Hydrogenated boridecene 2 8. Ethyl oleate 0.5 9. Ethylhexyl methoxycinnamate 3 10. Phenoxyethanol 0.3 11. Stearyl glycyrrhetinate 1 12. Diethylamino hydroxybenzoyl hexyl benzoate (Note 20) 1 13. Fragrance 0.2 14. Purified water 40 15. Carboxyvinyl polymer (Note 21) 0.1 16. 16. Acrylic acid / alkyl methacrylate copolymer (Note 22) 0.05 17. Sodium alginate (Note 23) 0.01 18. Purified water balance 19. Sodium monohydrogen phosphate 0.01 20. Sodium dihydrogen phosphate 0.01 21. Disodium edetate 0.01 22. Sodium hydroxide 0.04 (Note 20) Uvinal A PLUS GRANULAR (manufactured by BASF) (Note 21) CARBOPOL 980 (manufactured by LUBRIZOL ADVANCED MATERIALS) (Note 22) CARBOPOL 980 (manufactured by LUBRIZOL ADVANCED MATERIALS) (Note 23) Snow Algin M (manufactured by Fuji Chemical Industry Co., Ltd.)

[0081] (Production Method) A. Heat components (1) to (5) to 70°C and mix uniformly. B. Dissolve components (6) to (13) by heating at 70°C. C. Heat component (14) to 70°C. D. Gradually add B to A and mix and disperse using a Despa mixer. E. Gradually add C to D and mix and disperse using a Despa mixer. F. Cool E to room temperature and subject to high-pressure treatment at 100 MPa using a microfluidizer. G. Mix F with components (15) to (22) to obtain a daytime serum. The daytime serum obtained in this manner was excellent in terms of lack of gelation or precipitation, lack of creaminess, firmness, non-stickiness, and penetration. For component (A) phytosterol, the liquid oils corresponding to component (B) were jojoba seed oil (Ra=2.6), hydrogenated polydecene (Ra=4.29), ethyl oleate (Ra=2.16), and ethylhexyl methoxycinnamate (Ra=2.33), and the mass ratio (A) / (B) of the content of component (A) to the content of component (B) was 0.0048. For component (A) stearyl glycyrrhetinate, the liquid oils corresponding to component (B) were jojoba seed oil (Ra=4.05), hydrogenated polydecene (Ra=4.90), ethyl oleate (Ra=4.15), and ethylhexyl methoxycinnamate (Ra=3.59), and the mass ratio (A) / (B) of the content of component (A) to the content of component (B) was 0.095. With respect to component (A) diethylaminohydroxybenzoyl hexyl benzoate, the liquid oil corresponding to component (B) was ethylhexyl methoxycinnamate (Ra = 5.06), and the mass ratio (A) / (B) of the content of component (A) to the content of component (B) was 0.33. The mass ratio (A) / (B) of the content of component (A) to the content of all components (B) was 0.20. The mass ratio (C) / {(A) + (B)} of the total content of component (C) to the total content of component (A) and component (B) was 0.056. The content of component (D) relative to the total amount of the daytime serum was 10%, and the average particle size was approximately 250 nm.

[0082] Example 38: Sheet-type cosmetic (% by mass) 1. Hydrogenated phospholipid (Note 1) 0.4 2. Hydrogenated lysophospholipid (Note 2) 0.1 3. Phytosterol (Note 4) 0.05 4. 1,3-butylene glycol 5 5. Glycerin 5 6. Olive fruit oil 2 7. Squalane 1 8. Dimethicone 0.5 9. Ethyl oleate 1 10. Ascorbyl tetrahexyldecanoate 0.2 11. Phenoxyethanol 0.3 12. Stearyl glycyrrhetinate 1 13. Ceramide NP (Note 24) 0.05 14. Fragrance 0.05 15. Purified water 20 16. Purified water balance 17. Sodium monohydrogen phosphate 0.02 18. 19. Sodium dihydrogen phosphate 0.02 20. Disodium edetate 0.01 21. Ethanol 5 22. Rice fermentation liquid 0.5 (Note 24) CERAMIDE 3 (Cosmo Farm Co., Ltd.)

[0083] (Manufacturing Method) A. Heat components (1) to (5) to 70°C and mix uniformly. B. Heat and dissolve components (6) to (14) at 70°C. C. Heat component (15) to 70°C. D. Gradually add B to A and mix and disperse using a Despa Mixer. E. Gradually add C to D and mix and disperse using a Despa Mixer. F. Cool E to room temperature and subject to high-pressure treatment at 200 MPa using an Ultimizer. G. Mix components (16) to (21) with F and impregnate a sheet material to obtain a sheet-type cosmetic. The lotion obtained in this manner was excellent in terms of lack of gelation or precipitation, lack of creaminess, firmness, non-stickiness, and penetration. For component (A) phytosterol, the liquid oils corresponding to component (B) were olive fruit oil (Ra=1.61), squalane (Ra=4.53), and ethyl oleate (Ra=2.16), and the mass ratio (A) / (B) of the content of component (A) to the content of component (B) was 0.0125. For component (A) stearyl glycyrrhetinate, the liquid oils corresponding to component (B) were olive fruit oil (Ra=3.57), squalane (Ra=5.28), and ethyl oleate (Ra=4.15), and the mass ratio (A) / (B) of the content of component (A) to the content of component (B) was 0.25. For component (A) ceramide NP, the liquid oil corresponding to component (B) was ethyl oleate (Ra = 6.4), and the mass ratio of the content of component (A) to the content of component (B) was (A) / (B) was 0.05. The mass ratio of the content of all components (C) to the total content of all components (A) and all components (B), (C) / {(A) + (B)}, was 0.089. The content of component (D) relative to the total amount of the sheet-type cosmetic (excluding the sheet substrate) was 15%, and the average particle size was approximately 100 nm.

[0084] Example 39: Sheet-type beauty serum (mass %) 1. Hydrogenated phospholipid (Note 1) 0.3 2. Hydrogenated lysophospholipid (Note 2) 0.2 3. Cholesterol (Note 5) 0.1 4. Dipropylene glycol 5 5. Glycerin 5 6. Triethylhexanoin 3 7. Squalane 2 8. Isostearic acid 1 9. Phenoxyethanol 0.3 10. Stearyl glycyrrhetinate 1 11. Ceramide NG (Note 6) 0.05 12. Fragrance 0.05 13. Purified water 20 14. Cellulose gum (Note 25) 0.05 15. Tamarind gum (Note 26) 0.01 16. Carrageenan (Note 27) 0.05 17. Purified water remaining 18. Sodium monohydrogen phosphate 0.02 19. Sodium dihydrogen phosphate 0.02 20. Disodium edetate 0.01 21. Ethanol 3 22. Hydrolyzed hyaluronic acid 0.1 (Note 25) CMC Daicel 1170 (Daicel Corporation) (Note 26) Glyloid 6C (Sumitomo Dainippon Pharma Co., Ltd.) (Note 27) GENUVISCO TYPE PJ-JPE (CP Kelco)

[0085] (Manufacturing Method) A. Heat components (1) to (5) to 70°C and mix uniformly. B. Heat and dissolve components (6) to (12) at 70°C. C. Heat component (13) to 70°C. D. Gradually add B to A and mix and disperse using a Despa Mixer. E. Gradually add C to D and mix and disperse using a Despa Mixer. F. Cool E to room temperature and subject to high-pressure treatment at 50 MPa using a Nanovater. G. Mix components (14) to (22) with F and impregnate a sheet material to obtain a sheet-form beauty serum. For component (A) cholesterol, the liquid oils corresponding to component (B) were triethylhexanoin (Ra = 1.69), squalane (Ra = 5.00), and isostearic acid (Ra = 2.43), and the mass ratio (A) / (B) of the content of component (A) to the content of component (B) was 0.0167. For component (A) stearyl glycyrrhetinate, the liquid oils corresponding to component (B) were triethylhexanoin (Ra = 3.69), squalane (Ra = 5.28), and isostearic acid (Ra = 5.20), and the mass ratio (A) / (B) of the content of component (A) to the content of component (B) was 0.17. For component (A) ceramide NG, the liquid oil corresponding to component (B) was isostearic acid (Ra = 4.98), and the mass ratio (A) / (B) of the content of component (A) to the content of component (B) was 0.05. The mass ratio (C) / {(A) + (B)} of the content of all components (C) to the sum of the contents of all components (A) and all components (B) was 0.070. The content of component (D) relative to the total amount of the sheet-form cosmetic serum (excluding the sheet substrate) was 13%, and the average particle size was approximately 300 nm.

[0086] Example 40: Sunscreen Cosmetic (% by mass) 1. Hydrogenated phospholipid (Note 1) 0.8 2. Phytoterol (Note 4) 0.2 3. 1,3-butylene glycol 5 4. Glycerin 5 5. Behentrimonium chloride 0.1 6. Triethylhexanoin 5 7. Ethylhexyl methoxycinnamate 7 8. Ethyl oleate 0.5 9. Phenoxyethanol 0.3 10. Stearyl glycyrrhetinate 0.7 11. t-Butyl methoxydibenzoylmethane (Note 28) 2 12. Fragrance 0.05 13. Purified water 40 14. (Acrylates / Alkyl acrylate (C10-30)) Crosspolymer (Note 29) 0.05 15. 16. Hydroxyethylcellulose (Note 30) 0.2 16. Xanthan gum (Note 31) 0.1 17. Purified water balance 18. Triethanolamine 0.05 19. Sodium monohydrogen phosphate 0.02 20. Sodium dihydrogen phosphate 0.02 21. Disodium edetate 0.01 22. Ethanol 5 23. Zinc oxide 2 (Note 28) PARSOL 1789 (manufactured by L.C. United) (Note 29) PEMULEN TR-1 (manufactured by LUBRIZOL ADVANCED MATERIALS) (Note 30) NATROSOL 250 HHR (manufactured by ASHLAND) (Note 31) GRINSTED XANTHAN CLEAR 80 (manufactured by DANISCC)

[0087] (Manufacturing Method) A. Heat components (1) to (4) to 70°C and mix uniformly. B. Dissolve components (5) to (12) by heating at 70°C. C. Heat component (13) to 70°C. D. Gradually add B to A and mix and disperse using a Despa mixer. E. Gradually add C to D and mix and disperse using a Despa mixer. F. Cool E to room temperature and subject to high-pressure treatment at 50 MPa using a Nanovater. G. Mix components (14) to (23) with F to obtain a sunscreen cosmetic. For component (A) phytoterol, the liquid oils corresponding to component (B) were triethylhexanoin (Ra=1.54), ethylhexyl methoxycinnamate (Ra=2.33), and ethyl oleate (Ra=2.16), and the mass ratio (A) / (B) of the content of component (A) to the content of component (B) was 0.016. For component (A) stearyl glycyrrhetinate, the liquid oils corresponding to component (B) were triethylhexanoin (Ra=3.69), ethylhexyl methoxycinnamate (Ra=3.59), and ethyl oleate (Ra=4.15), and the mass ratio (A) / (B) of the content of component (A) to the content of component (B) was 0.056. For component (A) t-butyl methoxydibenzoylmethane, the liquid oil corresponding to component (B) was ethylhexyl methoxycinnamate (Ra = 4.88), and the mass ratio (A) / (B) of the content of component (A) to the content of component (B) was 0.29. The mass ratio (C) / {(A) + (B)} of the content of all components (C) to the sum of the contents of all components (A) and all components (B) was 0.052. The content of component (D) relative to the total amount of the sunscreen cosmetic was 15%, and the average particle size was approximately 200 nm.

Claims

1. An oil-in-water emulsion cosmetic comprising: (A) an oil solution which is solid at 25°C and has an IOB value of 0.2 to 0.8; (B) an oil solution which is liquid at 25°C and has an HSP distance Ra from component (A) of 7.0 or less; (C) one or more members selected from the group consisting of phospholipids and lysophospholipids; and (D) one or more members selected from the group consisting of ethanol and polyhydric alcohols having an IOB value of 1.5 to 5, and having an average particle size of emulsion droplets of 400 nm or less.

2. The oil-in-water emulsion cosmetic according to claim 1, wherein the component (C) contains a lysophospholipid.

3. The oil-in-water emulsion cosmetic according to claim 1 or 2, wherein the mass ratio (C) / {(A)+(B)} of the content of component (C) to the total content of component (A) and the content of component (B) is 0.03 to 1.

0.

4. The oil-in-water emulsion cosmetic according to claim 1 or 2, wherein the content of said component (D) is 5 to 40 mass% based on the total amount of said oil-in-water emulsion cosmetic.

5. The oil-in-water emulsion cosmetic according to claim 1 or 2, further comprising component (E) erythritol.

6. The oil-in-water emulsion cosmetic according to claim 1 or 2, which has a viscosity at 30° C. of 1 to 4,000 mPa·s.

7. The oil-in-water emulsion cosmetic according to claim 1 or 2, which is applied to or impregnated into a sheet material.

Images