Oil-based emulsions in water

Abstract

To provide an oil-in-water type emulsion composition using a polar oil having an organic value of 700 or more and an IOB value of 0.07 or more as an oil solution, which has excellent stability over time and is further excellent in gloss and non-stickiness during application.SOLUTION: There is provided an oil-in-water type emulsion composition which comprises the following components (A) to (D), wherein the component (B) emulsified with the component (A) is dispersed in an aqueous solvent containing the components (C) and the component (D) and the emulsified particles have an average particle diameter of 200 nm or more. (A) A nonionic surfactant having a weighted average HLB value of 9 or more and 11 or less, which contains at least one polyoxyethylene hydrogenated castor oil. (B) An oily component containing a polar oil having an organic value of 700 or more and an IOB value of 0.07 or more. (C) One or two or more selected from the group consisting of a polyhydric alcohol excluding dipropylene glycol and an alkylene oxide derivative. (D) Water.SELECTED DRAWING: None

Description

Technical Field

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

Background Art

[0002] Generally, in an oil-in-water type emulsion composition, since the continuous phase is composed of an aqueous component, when used as a cosmetic, it has characteristics such as ease of production, resistance to temperature effects, a light and smooth spread, a refreshing feeling of use, and the ability to adjust a wide range of textures and properties depending on the type and amount of oil. Among them, by miniaturizing the emulsion droplets, it becomes possible to obtain an oil-in-water type emulsion composition with good stability over time, and there has been proposed a lotion or the like that exhibits a semi-transparent to transparent appearance while containing an oily component. Incidentally, as a method for miniaturizing emulsion droplets, the use of a high-pressure emulsifier and a phase inversion temperature emulsification method are known.

[0003] Among oil-in-water type emulsion compositions, polar oil may be used as an oily component. So far, attempts have been made to reduce the particle size of emulsion droplets and obtain a composition with excellent stability in an oil-in-water type emulsion composition using polar oil or the like. For example, in Patent Document 1, a lotion is disclosed in which heated water is added to heated oil, polyoxyethylene hydrogenated castor oil, and polyhydric alcohol and emulsified, and the average particle size is 50 to 200 nm, and 50% or more of the oil component is jojoba oil (see Patent Document 1).

[0004] Among polar oils, polar oils having an organic value of 700 or more and an IOB value of 0.07 or more, such as acylamino acid sterols and fatty acid sterols, can impart effects such as gloss upon application. So far, many cosmetics or external skin preparations containing polar oils having an organic value of 700 or more and an IOB value of 0.07 or more have been developed, and for further product development, the development of a technique for stably and simply microemulsifying such polar oils is required.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2007-63183 [Overview of the project] [Problems that the invention aims to solve]

[0006] However, even in the technology disclosed in Patent Document 1, the stability of the oil-in-water emulsion composition was not sufficient, and there was room for improvement. Furthermore, the fine emulsification of polar oils with an organic value of 700 or more and an IOB value of 0.07 or more was not considered. In addition, Patent Document 1 requires heating of the oil, and there was room for improvement in terms of energy costs, productivity, and environmental considerations.

[0007] Therefore, the present invention has been made in view of the above circumstances, and aims to provide an oil-in-water emulsion composition that has excellent long-term stability, using a polar oil with an organic value of 700 or more and an IOB value of 0.07 or more.

[0008] Another object of the present invention is to provide an oil-in-water emulsion composition that can impart shine to skin and hair without leaving a sticky residue. [Means for solving the problem]

[0009] The inventors of the present invention conducted intensive research to solve the above problems and have found that by emulsifying an oily component containing a polar oil with an organic value of 700 or more and an IOB value of 0.07 or more in one or more aqueous solvents selected from the group consisting of polyhydric alcohols excluding dipropylene glycol and alkylene oxide derivatives, with a nonionic surfactant exhibiting a specific HLB including polyoxyethylene hydrogenated castor oil, the polar oil can be stably and finely emulsified to the extent that it maintains a transparent to translucent appearance, and a superior gloss effect can be obtained without stickiness when applied to skin or hair, thus completing the present invention.

[0010] In other words, the present invention is as follows. [1] The present invention relates to an oil-in-water emulsion composition containing the following components (A) to (D), This is an oil-in-water emulsion composition in which component (B), emulsified by component (A), is dispersed in an aqueous solvent containing component (C) and component (D), and the average particle size of the emulsion particles is 200 nm or less. (A) A nonionic surfactant comprising at least one type of polyoxyethylene hydrogenated castor oil, with a weighted average HLB of 9 or more and 11 or less. (B) Oily components containing polar oils with an organic value of 700 or higher and an IOB value of 0.07 or higher for at least one type. (C) One or more selected from the group consisting of polyhydric alcohols and alkylene oxide derivatives, excluding dipropylene glycol. (D)Water [2] The polyoxyethylene hydrogenated castor oil of component (A) may be polyoxyethylene hydrogenated castor oil having an average number of ethylene oxide addition moles of 20. [3] A polar oil having an organic value of 700 or more for component (B) and an IOB value of 0.07 or more, It may be one or more selected from the group consisting of fatty acid sterol esters that exhibit a paste-like state at 25°C, N-acyl amino acid esters that exhibit one of the properties of a highly viscous liquid, paste, or solid state at 25°C, vegetable oils and fats that exhibit a paste-like or solid state at 25°C, polyglycerol fatty acid esters that exhibit a highly viscous liquid or paste-like state at 25°C, and dimer acid derivatives that exhibit a highly viscous liquid or paste-like state at 25°C. [4] The aforementioned component (C) may be an alkylene oxide derivative. [5] The alkylene oxide derivative of component (C) may be one or more selected from the group consisting of polyoxyethylene glycerin, polyoxypropylene diglyceryl ether, polyoxyethylene methyl glucoside, polyoxypropylene methyl glucoside, and polyoxybutylene polyoxyethylene polyoxypropylene glyceryl ether. [6] The mass ratio (B) / (A) of the above-mentioned components (A) and (B) may be 3 or less. [7] The polar oil having an organic value of 700 or more and an IOB value of 0.07 or more of component (B) may be one or more selected from the group consisting of shea butter, phytosteryl oleate, di(phytosteryl / octyldodecyl) lauroyl glutamate, di(octyldodecyl / phytosteryl / behenyl) lauroyl glutamate, polyglyceryl-10 decaisostearate, dimer dilinoleyl bisisostearyl dimer dilinoleate, and hydrogenated rosin condensate of dimer dilinoleyl. [8] The content of polar oil with an organic value of 700 or more and an IOB value of 0.07 or more relative to the above component (B) may be 50% by mass or more. [9] The mass ratio of the components (A) to (C) (A) / {(A)+(B)+(C)} may be 0.1 or greater.

[10] The aforementioned oil-in-water emulsion composition may be used in cosmetics or topical skin preparations.

[0011] Furthermore, the present invention may also be a method for producing an oil-in-water emulsion composition with an average particle size of 200 nm or less, characterized by mixing component (A) a nonionic surfactant containing at least one polyoxyethylene hydrogenated castor oil and having a weighted average HLB of 9 or more and 11 or less, component (B) an oily component containing at least one polar oil with an organic value of 700 or more and an IOB value of 0.07 or more, and component (C) one or more water-soluble solvents selected from the group consisting of polyhydric alcohols and alkylene oxide derivatives excluding dipropylene glycol, then adding a portion of component (D) water, and then adding the remaining component (D) water. [Effects of the Invention]

[0012] The present invention can stably microemulsify polar oils with an organic value of 700 or higher and an IOB value of 0.07 or higher, and exhibits excellent stability over time. Furthermore, the present invention also exhibits excellent gloss and non-stickiness when applied using polar oils with an organic value of 700 or higher and an IOB value of 0.07 or higher. [Modes for carrying out the invention]

[0013] The following describes preferred embodiments for carrying out the present invention. The embodiments described below are merely examples of representative embodiments of the present invention and should not be interpreted as narrowing the scope of the invention. Furthermore, the present invention is not limited to the embodiments described below. In this specification, "X~Y" indicating a range includes X and Y and means "X or greater and Y or less".

[0014] When performing oil-in-water emulsification using an oily component containing at least one polar oil with an organic value of 700 or more and an IOB value of 0.07 or more as component (B), since the polar oil of component (B) has a large molecular weight and a complex structure, it is difficult to obtain fine emulsion droplets, and the formulation stability tends to be unstable. However, by combining component (A) and component (C), fine emulsion droplets with an average particle diameter of 200 nm or less can be obtained, and the formulation stability (initial stability and stability over time) can be ensured. This is considered to be due to the fact that components (A), (B), and (C) form a bicontinuous phase, resulting in a low interfacial tension state, and forming fine emulsion droplets without depending on mechanical force. Although the emulsification stability of an oil agent for oil-in-water emulsification is often examined based on the balance of HLB of surfactants, the inventors have found that in the fine emulsification of polar oils and the like, the emulsification stability cannot be ensured only by the balance of the HLB of surfactants. As a result of the study, it was found that it is important for the stability of the fine emulsion to contain components (A) and (B) in the solvent containing component (C). That is, the present invention has found that in the fine emulsification of component (B), the combination of component (A) and component (C) is extremely important among various components present. Furthermore, by setting the average particle diameter of the emulsion particles to 200 nm or less, when applied to the skin or hair, component (B) is uniformly applied, and the effect of the oil agent is more likely to be exhibited. Also, by adopting the configuration of the present embodiment, gloss can be imparted when applied to the skin or hair.

[0015] The oil-in-water emulsion composition of the present embodiment is preferably liquid at 25°C. Generally, it is more difficult to ensure the formulation stability of a liquid oil-in-water emulsion composition than that of a viscous one. By being the present embodiment, the stability over time is ensured even though it is liquid at 25°C. Here, in this specification, being liquid at 25°C means being in a state having fluidity at 25°C. Specifically, at 25°C, it refers to the viscosity measured using a Brookfield type rotational viscometer being 10,000 mPa·s or less, preferably 5,000 mPa·s or less, and more preferably 2,000 mPa·s or less.

[0016] In addition, the oil-in-water type emulsion composition of the present embodiment preferably exhibits a transparent to semi-transparent appearance, and more preferably a transparent appearance.

[0017] From the perspective of stability over time, the average particle diameter of the emulsion particles in the oil-in-water type emulsion composition is 200 nm or less, preferably 100 nm or less, and more preferably 50 nm or less. The lower limit of the average particle diameter of the emulsion particles in the oil-in-water type emulsion composition is not particularly limited because the smaller the diameter, the better the formulation stability. Usually, it is 20 nm or more. Such fine emulsion particles can be obtained by a method described later, although not particularly limited.

[0018] The average particle diameter of the emulsion particles is the value measured by the examples.

[0019] (Component (A): A nonionic surfactant containing at least one polyoxyethylene hydrogenated castor oil and having a weight-average HLB of 9 or more and 11 or less)

[0020] Component (A) used in the present invention is a nonionic surfactant containing at least one polyoxyethylene hydrogenated castor oil and having a weight-average HLB of 9 or more and 11 or less. The nonionic surfactant is obtained by adding a hydrophilic group such as a polyhydric alcohol to a lipophilic group such as an alkyl group, and is included for the purpose of forming a bicontinuous phase with components (B) and (C) and forming emulsion droplets.

[0021] Nonionic surfactants are not particularly limited as long as they are commonly used in cosmetics, etc., but polyoxyethylene hydrogenated castor oil, polyoxyethylene fatty acid sorbitan, fatty acid sorbitan, fatty acid polyglycerol ester, fatty acid glycerol ester, polyoxyethylene fatty acid glyceryl, polyoxyethylene sterol ether, etc. can be used. For example, polyoxyethylene hydrogenated castor oil such as PEG-10 hydrogenated castor oil, PEG-20 hydrogenated castor oil, PEG-30 hydrogenated castor oil, PEG-40 hydrogenated castor oil, PEG-60 hydrogenated castor oil, PEG-80 hydrogenated castor oil, PEG-50 hydrogenated castor oil isostearate, etc.; monococonut fatty acid polyoxyethylene sorbitan (20 E.O.), monolaurate polyoxyethylene sorbitan (20 E.O.), monolaurate polyoxyethylene sorbitan (80 E.O.), monopalmitate polyoxyethylene sorbitan (20 E.O.), mo Polyoxyethylene sorbitan nostearate (6 E.O.), polyoxyethylene sorbitan monostearate (20 E.O.), polyoxyethylene sorbitan monooleate (6 E.O.), polyoxyethylene sorbitan monooleate (20 E.O.), polyoxyethylene sorbitan monoisostearate (20 E.O.), polyoxyethylene sorbitan tristearate (20 E.O.), polyoxyethylene sorbitan trioleate (20 E.O.), polyoxyethylene sorbitan tetraoleate (60 E.O.)) and other polyoxyethylene fatty acid sorbitan; sorbitan fatty acids such as sorbitan coconut fatty acid, sorbitan laurate, sorbitan palmitate, sorbitan stearate, sorbitan isostearate, sorbitan oleate, sorbitan sesquistearate, sorbitan sesquioleate, sorbitan trioleate, etc.; polyglyceryl-10 monolaurate, polyglyceryl-10 monostearate, polyglyceryl-10 monoisostearate, monoole Polyglyceryl-10 iodate, polyglyceryl-6 dicaprate, polyglyceryl-2 diisostearate, polyglyceryl-6 diisostearate, polyglyceryl-10 diisostearate, polyglyceryl-10 dioleate, polyglyceryl-10 tristearate, polyglyceryl-2 triisostearate, polyglyceryl-5 trioleate, polyglyceryl-10 trioleate, polyglyceryl-2 tetraisostearate, pentastearyl Examples include fatty acid polyglycerol esters such as polyglyceryl-10 iodide, polyglyceryl-10 pentaisostearate, and polyglyceryl-10 pentaoleate; fatty acid glycerol esters such as hydrogenated coconut fatty acid glyceryl, glyceryl laurate, glyceryl palmitate, glyceryl stearate, glyceryl isostearate, and glyceryl oleate; polyoxyethylene fatty acid glyceryls such as polyoxyethylene glyceryl monoisostearate (8 E.O.), polyoxyethylene glyceryl monoisostearate (20 E.O.), and polyoxyethylene glyceryl triisostearate (20 E.O.); and polyoxyethylene sterol ethers such as PEG-5 cholesterol, PEG-10 cholesterol, PEG-20 cholesterol, PEG-30 cholesterol, PEG-5 phytosterol, PEG-10 phytosterol, PEG-20 phytosterol, and PEG-30 phytosterol. As nonionic surfactants, one or more of these can be appropriately selected and used. In the present invention, as component (A), it is preferable to select and use one or more selected from the group consisting of PEG-10 hydrogenated castor oil, PEG-20 hydrogenated castor oil, PEG-30 hydrogenated castor oil, PEG-40 hydrogenated castor oil, PEG-60 hydrogenated castor oil, PEG-80 hydrogenated castor oil, PEG-50 hydrogenated castor oil isostearate, polyoxyethylene sorbitan monooleate (20 E.O.), sorbitan sesquistearate, and PEG-5 phytosterols, from the viewpoint of long-term stability.

[0022] Component (A) of this composition contains at least one type of polyoxyethylene hydrogenated castor oil. Polyoxyethylene hydrogenated castor oil is obtained by adding ethylene oxide to hydrogenated castor oil.

[0023] Examples of hydrogenated polyoxyethylene castor oil include PEG-10 hydrogenated castor oil, PEG-20 hydrogenated castor oil, PEG-30 hydrogenated castor oil, PEG-40 hydrogenated castor oil, PEG-60 hydrogenated castor oil, PEG-80 hydrogenated castor oil, and PEG-50 hydrogenated castor oil isostearate. In the present invention, from the viewpoint of long-term stability, it is preferable to use hydrogenated polyoxyethylene castor oil (PEG-20 hydrogenated castor oil) in which the average number of moles of ethylene oxide added is 20.

[0024] In the present invention, from the viewpoint of long-term stability, component (A) contains polyoxyethylene hydrogenated castor oil, more preferably contains at least PEG-20 hydrogenated castor oil, and is particularly preferred to contain PEG-20 hydrogenated castor oil.

[0025] Component (A) has a weighted average HLB of 9 or more and 11 or less. When the weighted average HLB is this value, it forms a bicontinuous phase with components (B) and (C), and an emulsion composition can be obtained in which the emulsion droplets are fine and have excellent stability. In the present invention, the weighted average HLB is calculated by weighting the individual HLB values ​​of the contained component (A) based on the content mass ratio (see (Equation 1) below). Weighted average HLB of component (A) = [(A1: Content (mass %) x HLB) + (A2: Content (mass %) x HLB) + (A3: Content (mass %) x HLB) + / (A1 + A2 + A3 +: Content (mass %))] (Formula 1)

[0026] Here, HLB (Hydphile-Lipophile Balance) in this invention is an index that indicates the balance between hydrophilicity and lipophilicity, and is calculated by the following formula (Equation 2) by Oda, Teramura et al. HLB = "Inorganic value (IV) / Organic value (OV)" × 10 ... (Equation 2) (See Yoshio Koda, "Organic Concept Diagrams - Fundamentals and Applications," pp. 11-17, Sankyo Publishing, 1984)

[0027] The content of component (A) is not particularly limited, but is preferably 0.1 to 30% by mass (hereinafter sometimes simply abbreviated as "%"), more preferably 0.5 to 15%, and even more preferably 1 to 5% in the oil-in-water emulsion composition. Within this range, it is more preferable because it provides better stability over time and gloss when applied. Furthermore, the content of polyoxyethylene hydrogenated castor oil in component (A) is preferably 20% or more, and more preferably 50% or more. Within this range, it is more preferable because it allows for the acquisition of finer emulsion droplets and provides better stability over time.

[0028] (Component (B): Oily component containing at least one polar oil with an organic value of 700 or higher and an IOB value of 0.07 or higher)

[0029] Component (B) used in the present invention is an oily component containing at least one polar oil with an organic value of 700 or more and an IOB value of 0.07 or more, and forms a bicontinuous phase with components (A) and (C), and is dispersed in an aqueous solvent as an emulsion droplet. The polar oil of component (B) with at least one organic value of 700 or more and an IOB value of 0.07 or more (hereinafter sometimes simply referred to as "polar oil") refers to an oily component mainly consisting of a hydrocarbon skeleton and having polar groups, mainly including ester oils. The polar oil of component (B) has an excellent effect of imparting shine when applied to skin or hair.

[0030] Here, the IOB value is a value determined based on the Organic Concept Diagram (Takashi Fujita, Prediction of Organic Compounds and the Organic Concept Diagram, Chemistry Vol. 11, No. 10 (1957) 719-715). More specifically, in this Organic Concept Diagram, the physicochemical properties of a compound are expressed by defining the degree of properties mainly due to van der Waals forces as "organic" and the degree of properties mainly due to electrical affinity as "inorganic." The IOB value is an index that shows the balance between inorganic and organic properties, and is expressed as IOB value = inorganic value / organic value.

[0031] The polar oil of component (B) can be used in any form—liquid, paste, or solid—at 25°C, but from the viewpoint of gloss during application, it is more preferable to use a highly viscous liquid, paste, or solid. In this invention, a liquid oil refers to one with a melting point of 25°C or lower, and a highly viscous liquid refers to one with a viscosity of 200 mPa·s or higher at 25°C as measured by a Brookfield rotational viscometer. A paste-like oil refers to an oil with a melting point of 25°C or higher but that has not completely solidified at 25°C. A solid oil refers to an oil with a melting point of 25°C or higher that has completely solidified at 25°C.

[0032] The polar oil of component (B) can be either a natural oil or a synthetic oil, as long as it has an organic value of 700 or more and an IOB value of 0.07 or more. In this invention, a synthetic oil is defined as one that contains some synthetic oil. One or more of these natural oils and synthetic oils can be used.

[0033] Natural oils with an organic content value of 700 or higher and an IOB value of 0.07 or higher can be used, such as fatty acid monoglycerides and vegetable oils. Examples of natural oils that are liquid at 25°C include olive fruit oil, macadamia nut oil, meadowfoam oil, avocado oil, castor oil, safflower oil, sunflower oil, canola oil, apricot kernel oil, moringa seed oil, camellia oil, rice germ oil, rice bran oil, orange roughy oil, vegetable oils such as oryzanol, and fatty acid monoglycerides such as jojoba oil. Examples of natural oils that are paste-like or solid at 25°C include shea butter, aristocium murumuru seed oil, and cocoa butter. Examples of natural oils that are solid at 25°C include beeswax. In the present invention, from the viewpoint of gloss when applied, a vegetable oil that exhibits a paste-like or solid form at 25°C is preferred, and shea butter (organic value: 1140, IOB value: 0.16) is more preferred.

[0034] Furthermore, while the natural oil is not particularly limited as long as its organic content value is 700 or higher and its IOB value is 0.07 or higher, from the viewpoint of the average particle size of the emulsion droplets, stability over time, and gloss when applied, it is preferable that the organic content value is 800 or higher, more preferably 1000 or higher, and that its IOB value is preferably 0.07 to 0.3, and more preferably 0.1 to 0.2. The upper limit of the organic content value is not particularly limited, as a higher value results in better gloss when applied, but it is generally preferable that it is 1500 or lower, and more preferably 1300 or lower.

[0035] As synthetic oils with an organic value of 700 or more and an IOB value of 0.07 or more, fatty acid and alcohol esters, fatty acid triglycerides, fatty acid sterol esters, N-acyl amino acid esters, fatty acid polyglycerol esters, dimer acid derivatives, etc., can be used. In the present invention, the polar oil of component (B) is preferably a synthetic oil that exhibits a high viscosity liquid, paste, or solid form at 25°C from the viewpoint of gloss when applied.

[0036] The ester of fatty acid and alcohol is an esterified product of fatty acid and alcohol. From the viewpoint of gloss when applied, etc., in the present invention, an ester that exhibits a paste-like or solid form at 25°C is preferred.

[0037] In the aforementioned ester, there are no particular limitations as long as the organicity value is 700 or more and the IOB value is 0.07 or more, but from the viewpoint of the average particle size of the emulsion droplets, stability over time, and gloss during application, the IOB value is preferably 0.07 to 0.3, and more preferably 0.1 to 0.2. The upper limit of the organicity value is not particularly limited, as a higher value results in better gloss during application, but it is usually preferably 1000 or less, and more preferably 900 or less.

[0038] The fatty acids constituting the ester portion of the aforementioned ester are not particularly limited, but their hydrocarbons may be saturated or unsaturated, and may be branched or cyclic. Specifically, examples include acetic acid, lactic acid, malic acid, citric acid, butyric acid, caproic acid, caprylic acid, lauric acid, myristic acid, pentadecanoic acid, palmitic acid, palmitoleic acid, stearic acid, oleic acid, linoleic acid, arachidonic acid, behenic acid, and triacontanoic acid. In addition to single-component fatty acids, mixed fatty acids obtained from natural sources such as coconut oil fatty acids, castor oil fatty acids, olive oil fatty acids, palm oil fatty acids, and macadamia nut oil fatty acids, or fatty acids obtained by synthesis (including branched fatty acids), may also be used. Furthermore, the alcohol constituting the ester portion of the ester is not particularly limited, but its hydrocarbon may be saturated or unsaturated, and may be branched or cyclic. Specifically, examples include ethylene glycol, propylene glycol, glycerin, trimethylolpropane, pentaerythritol, sorbitol, oleyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, isostearyl alcohol, arachidyl alcohol, octyldodecyl alcohol, and the like. Among these, in the present invention, it is more preferable that one or both of the fatty acid and / or alcohol be unsaturated or branched from the viewpoint of long-term stability and gloss during application. Specifically, examples include oleyl oleate (organic value: 720, IOB value: 0.09), arachidyl behenate (organic value: 840, IOB value: 0.07), octyldodecyl oleate (organic value: 720, IOB value: 0.09), isostearyl isostearate (organic value: 700, IOB value: 0.09), etc. In the present invention, from the viewpoint of gloss during application, etc., it is more preferable that the ester is oleyl oleate.

[0039] The fatty acid triglyceride is a triester compound of a fatty acid and glycerin. In the present invention, from the viewpoint of gloss when applied, a fatty acid triglyceride that exhibits one of the following properties at 25°C is preferred: a highly viscous liquid, a paste, or a solid.

[0040] In the aforementioned fatty acid triglycerides, there are no particular limitations as long as the organicity value is 700 or higher and the IOB value is 0.07 or higher. However, from the viewpoint of the average particle size of the emulsion droplets, stability over time, and gloss during application, it is preferable that the organicity value is 800 or higher and the IOB value is 0.07 to 0.3. The upper limit of the aforementioned organicity value is not particularly limited, as a higher value results in better gloss during application, but it is generally preferable to be 1500 or lower, and more preferably 1300 or lower.

[0041] The fatty acid constituting the ester portion of the fatty acid triglyceride is not particularly limited, but a monocarboxylic acid is preferred, and its hydrocarbon may be saturated or unsaturated, and may be branched or cyclic. Specific fatty acids are as described above. In particular, in the present invention, fatty acids having an unsaturated or branched structure are preferred from the viewpoint of long-term stability and gloss during application. Specifically, examples include triisostearate glyceride (organic value: 1110, IOB value: 0.16), trioleate glyceride (organic value: 1140, IOB value: 0.16), and tribehenate glyceride (organic value: 1380, IOB value: 0.13).

[0042] The aforementioned fatty acid sterol ester is an ester of a fatty acid and a sterol. In the present invention, from the viewpoint of gloss during application, a fatty acid sterol ester that exhibits a highly viscous liquid or paste-like state at 25°C is preferred, and a fatty acid sterol ester that exhibits a paste-like state is more preferred.

[0043] In the aforementioned fatty acid sterol ester, there are no particular limitations as long as the organic value is 700 or more and the IOB value is 0.07 or more. However, from the viewpoint of the average particle size of the emulsion droplets, stability over time, and gloss during application, it is preferable that the organic value is 800 or more, more preferably 900 or more, and that the IOB value is 0.1 to 0.3, and more preferably 0.1 to 0.2. The upper limit of the aforementioned organic value is not particularly limited, as a higher value results in better gloss during application, but it is generally preferable to have a value of 1200 or less, and more preferably 1000 or less.

[0044] The fatty acid constituting the ester portion of the fatty acid sterol ester is not particularly limited, but monocarboxylic acids are preferred, and the hydrocarbon may be saturated or unsaturated, and may be branched or cyclic. Specifically, examples include acetic acid, lactic acid, malic acid, citric acid, butyric acid, caproic acid, caprylic acid, lauric acid, myristic acid, pentadecanoic acid, palmitic acid, palmitoleic acid, stearic acid, oleic acid, linoleic acid, arachidonic acid, behenic acid, and triacontanoic acid. In addition to single-component fatty acids, mixed fatty acids obtained from natural sources such as coconut oil fatty acids, castor oil fatty acids, olive oil fatty acids, palm oil fatty acids, and macadamia nut oil fatty acids, or fatty acids obtained by synthesis (including branched fatty acids), may also be used. Among these, in the present invention, fatty acids having an unsaturated or branched structure are preferred from the viewpoint of long-term stability and gloss when applied. Furthermore, the sterol constituting the ester portion of the fatty acid sterol ester is not particularly limited, but is preferably cholesterol or phytosterol, and more preferably phytosterol. Specifically, examples include phytosteryl oleate (organic value: 920, IOB value: 0.16), phytosteryl isostearate (organic value: 900, IOB value: 0.16), cholesteryl oleate (organic value: 980, IOB value: 0.16), and cholesteryl isostearate (organic value: 870, IOB value: 0.16). In the present invention, from the viewpoint of providing a glossy effect, etc., it is more preferable that the fatty acid sterol ester is phytosteryl oleate.

[0045] The N-acyl amino acid ester is not particularly limited as long as it is commonly used in cosmetics and the like. In the present invention, from the viewpoint of gloss when applied, an N-acyl amino acid ester that exhibits any of the following properties at 25°C is preferred: a highly viscous liquid, a paste, or a solid.

[0046] In the above-mentioned N-acyl amino acid ester, there are no particular limitations as long as the organic value is 700 or more and the IOB value is 0.07 or more. However, from the viewpoint of the average particle size of the emulsion droplets, stability over time, and gloss during application, it is preferable that the organic value is 1000 or more, more preferably 1100 or more, and that the IOB value is 0.1 to 0.6, and more preferably 0.2 to 0.4. The upper limit of the above-mentioned organic value is not particularly limited, as a higher value results in better gloss during application, but it is generally preferable to have an organic value of 1500 or less, and more preferably 1300 or less.

[0047] The aforementioned N-acyl amino acid is preferably N-acyl aspartic acid, N-acyl glutamic acid, etc., and as the acyl group, an acyl group derived from saturated or unsaturated fatty acids having 8 to 22 carbon atoms is preferably used. Examples include dioctyldodecyl lauroyl glutamate, diisostearyl lauroyl glutamate, di(phytosteryl / octyldodecyl) lauroyl glutamate, di(phytosteryl / octyldodecyl / behenyl) lauroyl glutamate, di(cholesteryl / octyldodecyl) lauroyl glutamate, di(cholesteryl / octyldodecyl / behenyl) myristoylmethyl-β-alanine(phytosteryl / decyltetradecyl), etc. Among these, it is more preferable that the N-acyl amino acid portion is lauroyl glutamic acid and that the ester has a sterol skeleton, such as lauroyl glutamic acid di(octyldodecyl / phytosteryl / behenyl) (organic value: 1236, IOB value: 0.3), lauroyl glutamic acid di(cholesteryl / behenyl / octyldodecyl) (organic value: 1218, IOB value: 0.3), lauroyl glutamic acid di(phytosteryl / octyldodecyl) (organic value: 1214, IOB value: 0.3). In the present invention, from the viewpoint of gloss during application, it is more preferable that the N-acyl amino acid ester is lauroyl glutamic acid di(phytosteryl / octyldodecyl) and / or lauroyl glutamic acid di(octyldodecyl / phytosteryl / behenyl).

[0048] The fatty acid polyglycerol ester is an ester of a fatty acid and polyglycerol. In the present invention, from the viewpoint of gloss when applied, a fatty acid polyglycerol ester that exhibits a highly viscous liquid or paste-like state at 25°C is preferred.

[0049] In the fatty acid polyglycerol ester, there are no particular limitations as long as the organic value is 700 or more and the IOB value is 0.07 or more. However, from the viewpoint of the average particle size of the emulsion droplets, stability over time, and gloss during application, it is preferable that the organic value is 1000 or more, more preferably 2000 or more, and that the IOB value is 0.1 to 0.5, and more preferably 0.2 to 0.4. The upper limit of the organic value is not particularly limited, as a higher value results in better gloss during application, but it is generally preferable to have an organic value of 6000 or less, and more preferably 5000 or less.

[0050] The fatty acids constituting the ester portion of the fatty acid polyglycerol ester are not particularly limited, but monocarboxylic acids are preferred, and the hydrocarbons may be saturated or unsaturated, and may be branched or cyclic. Specific fatty acids are as described above. In particular, in the present invention, fatty acids having an unsaturated or branched structure are preferred from the viewpoint of long-term stability and gloss during application. Furthermore, the polyglycerin constituting the ester portion of the fatty acid polyglycerin ester is not particularly limited, but it is more preferably a 2-10 mer of glycerin, and even more preferably diglycerin, triglycerin (polyglycerin-3), polyglycerin-4, polyglycerin-6, or polyglycerin-10. Specifically, examples include polyglyceryl-2 tetraisostearate (organic value: 1520, IOB value: 0.17), polyglyceryl-4 pentaoleate (organic value: 2040, IOB value: 0.23), polyglyceryl-6 pentaoleate (organic value: 2160, IOB value: 0.33), polyglyceryl-10 decaoleate (organic value: 4200, IOB value: 0.24), and polyglyceryl-10 decaisostearate (organic value: 4100, IOB value: 0.25). In the present invention, it is more preferable that the fatty acid polyglycerol ester is polyglyceryl-10 decaisostearate.

[0051] The dimer acid derivative is a diester of a dibasic acid obtained by polymerization of two molecules of unsaturated fatty acids. In the present invention, from the viewpoint of gloss during application, a dimer acid derivative that exhibits a highly viscous liquid or paste-like state at 25°C is preferred.

[0052] In the dimer acid derivative, there are no particular limitations as long as the organicity value is 700 or more and the IOB value is 0.07 or more. However, from the viewpoint of the average particle size of the emulsion droplets, stability over time, and gloss during application, it is preferable that the organicity value is 1000 or more, more preferably 1500 or more, and that the IOB value is preferably 0.08 to 0.3, and more preferably 0.09 to 0.2. The upper limit of the organicity value is not particularly limited, as a higher value results in better gloss during application, but it is usually preferably 6000 or less, and more preferably 4500 or less.

[0053] The dimer acid constituting the ester portion of the dimer acid derivative is not particularly limited, but a dimer of an unsaturated fatty acid having 11 to 22 carbon atoms is preferred. Specifically, examples include dimer dilinoleic acid, dimer dilinolenic acid, dimer oleic acid, or hydrogenated versions thereof. Furthermore, the alcohol constituting the ester portion of the dimer acid derivative is not particularly limited, but examples include saturated or unsaturated linear or branched monohydric alcohols with 12 to 34 carbon atoms, and ring-containing or cyclic sterols. Specifically, examples include dimer dilinoleyl diisostearate (organic value: 1420, IOB value: 0.09), dimer dilinoleyl bisisostearyl dimer dilinoleate (organic value: 4300, IOB value: 0.1), dimer dilinoleic acid (phytosteryl / isostearyl / cetyl / stearyl / behenyl) (organic value: 1610, IOB value: 0.11), dimer dilinoleyl hydrogenated rosin condensate (organic value: 1500, IOB value: 0.17), and di(isostearyl / phytosteryl) dimer dilinoleate (organic value: 1620, IOB value: 0.12). In the present invention, it is more preferable that the dimer acid derivative is dimer dilinoleyl bisisostearyl dimer dilinoleate and / or dimer dilinoleyl hydrogenated rosin condensate.

[0054] Among the above components, it is particularly preferable that one or more are selected from the group consisting of shea butter, phytosteryl oleate, di(phytosteryl / octyldodecyl) lauroyl glutamate, di(octyldodecyl / phytosteryl / behenyl) lauroyl glutamate, polyglyceryl-10 decaisostearate, dimer dilinoleyl bisisostearyl dimer dilinoleate, and dimer dilinoleyl hydrogenated rosin condensate, from the viewpoint of gloss when applied.

[0055] The content of component (B) in the present invention is not particularly limited, but is preferably 0.1 to 20%, more preferably 0.5 to 15%, and even more preferably 1 to 10% in the oil-in-water emulsion composition. Within this range, it is more preferable because it provides superior stability over time, gloss and non-stickiness upon application.

[0056] Furthermore, the content of polar oil having an organic value of 700 or more and an IOB value of 0.07 or more relative to the total amount of component (B) is preferably 40% or more, more preferably 50% or more, even more preferably 80% or more, and particularly preferably 100% (where all of component (B) in the oil-in-water emulsion composition is polar oil with an organic value of 700 or more and an IOB value of 0.07 or more). This range is preferable because it allows for a composition with better long-term stability and higher gloss when applied.

[0057] In the present invention, the ratio of component (A) and component (B) can be appropriately set to obtain a composition with superior stability. The mass ratio of component (A) to component (B) (B) / (A) is not particularly limited, but is preferably 5 or less, and more preferably 3 or less. This range is preferable because it allows for the acquisition of a composition with superior stability over time. The lower limit of the mass ratio of component (B) / (A) in an oil-in-water emulsion composition is not particularly limited because the amount of nonionic surfactant relative to the oily component becomes excessive, improving stability, but is usually preferably 0.1 or more.

[0058] (Component (C): One or more selected from the group consisting of polyhydric alcohols and alkylene oxide derivatives, excluding dipropylene glycol)

[0059] Component (C) used in the present invention is one or more selected from the group consisting of polyhydric alcohols other than dipropylene glycol and alkylene oxide derivatives. Component (C) forms a continuous phase with components (A) and (B) and is used as a dispersion medium for emulsion droplets.

[0060] The aforementioned polyhydric alcohol is a compound having two or more hydroxyl groups in its molecule. Specifically, examples include glycerin, diglycerin, triglycerin, 1,3-butylene glycol, 1,2-pentanediol, 1,2-hexanediol, tripropylene glycol, and PEG-8. Furthermore, the alkylene oxide derivative is a compound in which polyoxyalkylene is bonded to a monohydric alcohol or polyhydric alcohol, and examples include polyoxyalkylene glycerin, polyoxyalkylene alkyl glucoside, polyoxypropylene alkyl ether, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene polyoxypropylene oxybutylene alkyl ether, polyoxyalkylene sorbitol, polyoxyalkylene erythritol ether, polyoxyalkylene pentaerythritol ether, polyoxyalkylene diglyceryl ether, polyoxyalkylene trimethylolpropane, polyoxypropylene glycol, polyoxyethylene polyoxypropylene glycol, polyoxybutylene polyoxyethylene polyoxypropylene glyceryl ether, polyoxyalkylene xylitol, polyoxyalkylene dipentaerythritol, polyoxyalkylene inositol, polyoxyalkylene sucrose ether, polyoxyalkylene trehalose ether, and polyoxyalkylene maltitol ether. In the present invention, component (C) is preferably an alkylene oxide derivative from the viewpoint of non-stickiness during application, more preferably one or more selected from the group consisting of polyoxyalkylene glycerin, polyoxyalkylene alkyl glucoside, and polyoxyalkylene diglyceryl ether, and even more preferably one or more selected from the group consisting of polyoxyethylene glycerin, polyoxypropylene diglyceryl ether, polyoxyethylene methyl glucoside, polyoxypropylene methyl glucoside, and polyoxybutylene polyoxyethylene polyoxypropylene glyceryl ether. It is more preferable that the substance be one or more selected from the group consisting of polyoxyethylene glycerin (26 E.O.), polyoxybutylene polyoxyethylene polyoxypropylene glyceryl ether (3 B.O.) (8 E.O.) (5 P.O.), polyoxyethylene methyl glucoside (10 E.O.), polyoxyethylene methyl glucoside (20 E.O.), polyoxypropylene methyl glucoside (10 E.O.), polyoxypropylene methyl methyl glucoside (20 E.O.), and polyoxypropylene diglyceryl ether (9 E.O.), and it is particularly preferable that the substance be polyoxyethylene glycerin (26 E.O.) from the viewpoint of superior gloss during application.

[0061] The content of component (C) in the present invention is not particularly limited, but is preferably 0.5 to 30%, more preferably 1 to 20%, and even more preferably 2 to 15% in the oil-in-water emulsion composition. Within this range, it is more preferable because it provides superior stability over time and a lack of stickiness when applied.

[0062] Furthermore, as described above, component (C) in the present invention functions as a solvent, and the solvent may contain other aqueous components. The content of component (C) relative to the solvent containing component (C) is not particularly limited, but 60% or more is preferred, 80% or more is more preferred, and 100% (the solvent is entirely component (C)) is particularly preferred. This range is preferred because it improves stability and provides excellent non-stickiness. Here, the solvent is a water-soluble component other than water, and examples include polyhydric alcohols other than component (C), such as dipropylene glycol, and lower alcohols such as ethanol.

[0063] Although the present invention can be obtained by appropriately including components (A) to (D), it is preferable to specify the mass ratio of components (A) to (C) so that higher effects can be expected in terms of stability over time and usability such as non-stickiness. The mass ratio of (A) / {(A)+(B)+(C)} is not particularly limited, but it is preferably 0.1 or more, and more preferably 0.2 or more. The upper limit of the mass ratio of (A) / {(A)+(B)+(C)} in an oil-in-water emulsion composition is not particularly limited because the ratio of components (B) and (C) to component (A), which is a surfactant, decreases, and the composition becomes more stable, but it is usually preferably 0.8 or less.

[0064] (Component (D): water) This embodiment is an oil-in-water emulsion composition, which contains water. The water is used as a dispersion medium and is not particularly limited, but examples include purified water, distilled water, ion-exchanged water, tap water, hot spring water, and deep-sea water.

[0065] The content of component (D) is not particularly limited, but it is preferably 40% or more in the oil-in-water emulsion composition.

[0066] In addition to the essential components described above, other additives may be added to the oil-in-water emulsion composition of the present invention. Other additives may include, for example, surfactants other than component (A), oily components, water-soluble polymers, lower alcohols, polyhydric alcohols other than component (C), amino acids, preservatives, chelating agents, cosmetic ingredients, etc., as appropriate, within limits that do not impair the effects of the present invention.

[0067] The oily components are not particularly limited, but include any non-polar oils with an organic content value of 700 or more and an IOB value of 0.07 or more in component (B). Specifically, regardless of their origin (animal oils, vegetable oils, synthetic oils, etc.) or their properties (solid oils, semi-solid oils, liquid oils, volatile oils, etc.), examples include hydrocarbons, fats and oils, waxes, hydrogenated oils, ester oils, fatty acids, higher alcohols, silicone oils, fluorinated oils, lanolin derivatives, oily gelling agents, oil-soluble cosmetic ingredients, etc.

[0068] The oil-in-water emulsion composition of this embodiment may be used as is as a final cosmetic or topical skin preparation, or it may be mixed with other components to form a cosmetic. That is, the second embodiment is a cosmetic containing the oil-in-water emulsion composition of the first embodiment. The cosmetic of the second embodiment is more likely to exhibit the effects of the oil-in-water emulsion composition, such as gloss upon application, lack of stickiness, and improved stability over time. Furthermore, it is preferable that the cosmetic is also of the oil-in-water type. Examples of oil-in-water emulsion cosmetics include a form in which an aqueous additive is added to the oil-in-water emulsion composition of the first embodiment to form an oil-in-water emulsion cosmetic (a cosmetic containing the oil-in-water emulsion composition of the first embodiment and an aqueous additive), and a form in which another oil-in-water emulsion composition is added to the oil-in-water emulsion composition of the first embodiment to form an oil-in-water emulsion cosmetic.

[0069] Examples of cosmetics include lotions, emulsions, creams, serums, massage cosmetics, face masks, hand creams, body lotions, body creams, makeup cosmetics, makeup bases, eye creams, sunscreens, hair creams, hair waxes, and hair mists. Examples of topical skin preparations include dispersions, ointments, lotions, aerosols, patches, poultices, and liniments. Among these, lotions, emulsions, creams, serums, massage cosmetics, face masks, body lotions, and hair mists are preferred because they can be stably micro-emulsified to maintain a transparent to translucent appearance, and when applied to the skin or hair, they do not feel sticky and provide a superior glossy finish. Methods of use include application by hand, fingers, or cotton, application by impregnation with non-woven fabric, or application by spraying onto hair. Furthermore, cosmetic substances can take the form of liquid, gel, emulsion, cream, semi-solid, or solid.

[0070] The content of the oil-in-water emulsion composition in the cosmetic is not particularly limited, but is preferably 10-100%.

[0071] Other ingredients added to cosmetics (especially aqueous additives) include water-soluble polymers, preservatives, antioxidants, lower alcohols, and cosmetic ingredients.

[0072] Examples of water-soluble polymers include carrageenan, xanthan gum, methylcellulose, hydroxyethylcellulose, carboxymethylcellulose, carboxyvinyl polymer, carbomer, alkyl-modified carboxyvinyl polymer, polyvinyl alcohol, polyvinylpyrrolidone, (sodium acrylate / sodium acryloyldimethyl taurate) copolymer, (PEG-240 / decyltetradeceth-20 / HDI) copolymer, polyquaternium-7, polyquaternium-10, polyquaternium-51, and phosphorylcholine glycol polyacrylate.

[0073] (Manufacturing method) The oil-in-water emulsion composition of this embodiment can be obtained by mixing components (A) to (D), for example, by mixing components (A) to (C) and then adding and mixing component (D). In the present invention, it is more preferable to mix components (A) to (C), then add and mix a portion of component (D), and then add component (D) further. Heating is not required at this time, but may be done if necessary. In other words, in this embodiment, component (D) can be added in one or two stages, but it is more preferable to add it in two stages, as components (A), (B), and (C) form two continuous phases with low interfacial tension, and fine emulsion droplets can be obtained without applying strong mechanical force. When adding component (D) in two stages, the content of some of the components (D) added first is appropriately adjusted according to components (A) to (C). In the present invention, it is preferable to add and mix until the appearance becomes semi-transparent, and more preferably, the content of components (A) to (C) is 30 to 500% of the total content (A) + (B) + (C). This range is preferable because it allows for the formation of fine emulsion droplets with an average particle size of 200 nm or less, resulting in an oil-in-water emulsion composition with superior stability over time. Various aqueous additives may be added to and mixed with the oil-in-water emulsion composition obtained in this way to make a cosmetic. Here, "semi-transparent" in the above-mentioned addition until the appearance becomes semi-transparent is not particularly limited as long as it can be judged to be semi-transparent by visual inspection, but it is preferable that the transmittance measured by a spectrophotometer (optical path length of cell: 10 mm, wavelength of light: 700 nm) is 30% or more. While not particularly limited, a spectrophotometer such as the "UV-2500PC UV-VIS REDCORDING SPECTROPHOTOMETER" (manufactured by SHIMADZU) can be used. [Examples]

[0074] The effects of the present invention will be explained using the following examples and comparative examples. However, the technical scope of the present invention is not limited to the following examples. Unless otherwise specified, each operation is performed at room temperature (25°C). In the examples, the units "parts" or "%" may be used, but unless otherwise specified, they represent "parts by mass" or "mass%". In the table, "polar oil" refers to a polar oil in which the organic value of component (B) is 700 or more and the IOB value is 0.07 or more.

[0075] Examples 1-29 and Comparative Examples 1-9: Oil-in-water emulsion compositions (lotions) Oil-in-water emulsion compositions were prepared according to the formulations shown in Tables 1-3 below, and their average particle size, long-term stability (room temperature / 14 days), gloss upon application, and non-stickiness upon application were evaluated using the methods described below. The results are also shown in Tables 1-3.

[0076] Table 1 JPEG0007870161000001.jpg141170

[0077] Table 2 JPEG0007870161000002.jpg145170

[0078] Table 3 JPEG0007870161000003.jpg130170 Note 1: Eldew PS-203 (manufactured by Ajinomoto Co., Inc.) Note 2: Eldew PS-304 (manufactured by Ajinomoto Co., Inc.) Note 3: LUSPLAN DA-DD-IS (manufactured by Nippon Seika Co., Ltd.) Note 4: LUSPLAN DD-DHR (manufactured by Nippon Seika Co., Ltd.) Note 5: S-Face IS-1009P (manufactured by Sakamoto Pharmaceutical Co., Ltd.) Note 6: Rice sterol ester (manufactured by Tsukuno Rice Fine Chemicals Co., Ltd.) Note 7: Lipex Shear (manufactured by Aarhus Karlshamn Sweden AB) Note 8: Refined jojoba oil (manufactured by Higher Alcohol Industry Co., Ltd.) Note 9: Olive oil RX (manufactured by NOF Corporation) Note 10: SUPER REFINED CRODAMOL OO (manufactured by CRODA) Note 11: NIKKOL EOO (manufactured by Japan Surfactant Industry Co., Ltd.) Note 12: Silicone KF-56 (manufactured by Shin-Etsu Chemical Co., Ltd.) Note 13: LIPONIC EG-1 (manufactured by LIPO CHEMICALS INC.) Note 14: Wilbride S-753D (manufactured by NOF Corporation) Note 15: MacBioBride MG-10E (manufactured by NOF Corporation) Note 16: MacBioBride MG-10P (manufactured by NOF Corporation) Note 17: SY-DP9 (manufactured by Sakamoto Pharmaceutical Co., Ltd.)

[0079] (Manufacturing method) A. Mix ingredients (1) to (31) uniformly. A portion of component (32) was added to BA and mixed until the appearance became semi-transparent, and then the remaining component (32) was further added and emulsified to obtain an oil-in-water emulsion composition.

[0080] (Evaluation method 1: Average particle size) For the average particle size, each sample was packed into a plastic cuvette UVette 220-1600 nm (manufactured by Eppendorf), and the average particle size immediately after manufacturing was measured using a real-time nanoparticle size analyzer DelsaMax CORE (manufactured by Beckman Coulter, Inc.). The results were then evaluated according to the following four-stage criteria. 4-level evaluation criteria (Judgment) :(Judgment criteria) ◎(Excellent): Average particle size is 50 nm or less ○ (Good): Average particle size is greater than 50 nm and less than or equal to 200 nm. △ (Somewhat unacceptable): Average particle size is greater than 200 nm and less than or equal to 1000 nm. × (Not acceptable): Average particle diameter is greater than 1000 nm

[0081] (Evaluation method 2: Stability over time) For long-term stability, each prepared sample was filled into a 30g standard size 8 bottle and stored at room temperature for 14 days. The stability was then evaluated according to the following four-stage criteria. 4-level evaluation criteria (Judgment) :(Judgment criteria) ◎(Excellent): No oil separation and uniform texture. 〇 (Good): A slight oily layer is visible, but it returns to a uniform consistency with gentle shaking. △ (Somewhat unacceptable): Oil separation is observed, and the mixture does not become uniform with gentle shaking. × (Not acceptable): The oil layer is separated.

[0082] (Evaluation method 3: Gloss upon application) Ten women in their 20s to 40s, trained in sensory evaluation and capable of evaluating according to a set standard, were selected as a cosmetics expert evaluation panel. For each sample, the cosmetics expert evaluation panel members evaluated the perceived shine when applied to the skin on a 5-point scale using the absolute evaluation method described below, assigning a score. The average score was calculated from the sum of the scores from all panel members for each sample, and the final evaluation was made according to the 4-point evaluation criteria described below. Absolute evaluation criteria (Rating) : (Evaluation) 5 points: I feel it makes my skin look very radiant. 4 points: I feel my skin has a nice glow. 3 points: I feel the skin has a slight glow. 2 points: I don't feel like my skin has much radiance. 1 point: I don't feel like my skin has any radiance. 4-level evaluation criteria (Judgment): (Average score of the ratings) ◎ (Excellent): Above 4 points: Very good ○ (Good): 3 points or more, 4 points or less: Good △ (Slightly unacceptable): Over 2 points but 3 points or less: Slightly poor × (not possible): 2 points or less: defective

[0083] (Evaluation method 4: Absence of stickiness during application) Ten women in their 20s to 40s, trained in sensory evaluation and capable of evaluating according to a set standard, were selected as a cosmetics expert evaluation panel. For each sample, the cosmetics expert evaluation panel members evaluated the lack of stickiness felt when applied to the skin on a 5-point scale using the absolute evaluation method described below, and assigned a score. The average score was calculated from the sum of the scores of all panel members for each sample, and the evaluation was made according to the 4-point judgment criteria described below. Absolute evaluation criteria (Rating) : (Evaluation) 5 points: No stickiness. 4 points: Almost no stickiness. 3 points: Feels slightly sticky. 2 points: Feels sticky. 1 point: It feels very sticky. 4-level evaluation criteria (Judgment): (Average score of the ratings) ◎ (Excellent): Above 4 points: Very good ○ (Good): 3 points or more, 4 points or less: Good △ (Slightly unacceptable): Over 2 points but 3 points or less: Slightly poor × (not possible): 2 points or less: defective

[0084] As is clear from the results in Tables 1-3, the oil-in-water emulsion compositions of Examples 1-29 were superior to the oil-in-water emulsion compositions of Comparative Examples 1-9 in all aspects, including average particle size, stability over time, gloss during application, and lack of stickiness during application.

[0085] In contrast, Comparative Example 1, in which the weighted average HLB of component (A) was greater than 11, had a large average particle size of 1000 nm or more, resulting in inferior performance in terms of long-term stability and lack of stickiness during application. Similarly, Comparative Examples 2 and 3, which did not contain polyoxyethylene hydrogenated castor oil as component (A), also had a large average particle size of 1000 nm or more, resulting in inferior performance in terms of long-term stability and lack of stickiness during application. Comparative Examples 4 and 5, in which the polar oil of component (B) had an organic value of less than 700, had an average particle size greater than 200 nm, resulting in inferior performance in terms of long-term stability, gloss during application, and lack of stickiness during application. Furthermore, Comparative Examples 6 and 7, which contained silicone oil or hydrocarbon oil instead of the polar oil of component (B), had a large average particle size of 1000 nm or more, resulting in inferior performance in terms of long-term stability and gloss during application. Furthermore, in Comparative Examples 8 and 9, where dipropylene glycol or ethanol was used instead of component (C), the average particle size was large (over 1000 nm), resulting in inferior performance in terms of long-term stability, gloss during application, and lack of stickiness during application.

[0086] Example 30: Lotion (component) (mass%) (1) Lauroyl glutamate di(phytosteryl / octyldodecyl) (Component (B)) 2 (2) PEG-20 Hydrogenated Castor Oil (Component (A)) 2 (3) Di(C12-15)pareth-8-phosphate 0.05 (4) Polyoxyethylene glycerin (26 E.O.) (Component (C)) 4 (5) Astaxanthin (Component (B)) 0.002 (6) Isopropylmethylphenol (Component (B)) 0.01 (7) Vitamin E (Component (B)) 0.03 (8) Purified water (component (D)) 50 (9) Glycerin 5 (10) Dipropylene glycol 5 (11) 1,3-Butylene glycol 5 (12) Purified water remaining amount (13) Ethanol 8 (14) Phenoxyethanol 0.2 (15) Niacinamide 3 (16) Betaine 1 (17) Sodium lactate 1 (18) Polyquaternium-51 Note 18 0.01 (19) Cyclohexane-1,4-dicarboxylic acid bisethoxydiglycol Note 19 1 (20) Alcaligenes-derived polysaccharides Note 20 0.01 Note 18: LIPIDURE PMB(BG) (manufactured by NOF Corporation) Note 19: NEOSOLUE-AQULIO (manufactured by Nippon Seika Co., Ltd.) Note 20: Alkasiran (manufactured by Hakuto Co., Ltd.).

[0087] (Manufacturing method) A. Mix ingredients (1) to (7) uniformly. A portion of component (8) was added to BA and mixed until the appearance became semi-transparent, and then the remaining portion of component (8) was added and emulsified to obtain an oil-in-water emulsion composition. This oil-in-water emulsion composition was liquid at 25°C and had an average particle size of 200 nm or less. It also exhibited excellent long-term stability, gloss upon application, and lack of stickiness. Mix components (9) to (20) with CB. The DC was filled into a container to obtain a lotion. The lotion obtained in this manner provided a high level of gloss immediately after application to the skin, was non-sticky, and exhibited excellent stability over time.

[0088] Example 31: Lotion (component) (mass%) (1) Lauroyl glutamate di(phytosteryl / octyldodecyl) (Component (B)) 1 (2) PEG-20 Hydrogenated Castor Oil (Component (A)) 2 (3) Polyoxyethylene methyl glucoside (10E.O.) (Component (C)) 3 (4) Cholesterol (component (B)) 0.01 (5) Ceramide 3 (Component (B)) 0.01 (6) Vitamin E (Component (B)) 0.01 (7) Purified water (component (D)) 40 (8) Glycerin 5 (9) 1,3-Butylene glycol 10 (10) Methyl parahydroxybenzoate 0.1 (11) Purified water remaining amount (12) Ethanol 5 (13) Ascorbic acid glucoside 3 (14) Arbutin 1 (15) Sodium lactate 2 (16) Phosphorylcholine glycol polyacrylate Note 21 0.01 (17) Sodium hydroxide 0.13 (18) Sodium monohydrogen phosphate 0.1 (19) Sodium dihydrogen phosphate 0.1 (20) Xanthan gum 0.05 Note 21: LIPIDURE HM-600 (manufactured by NOF Corporation)

[0089] (Manufacturing method) A. Heat ingredients (1) to (6) to approximately 80°C and mix them uniformly. An oil-in-water emulsion composition was obtained by gradually adding component (7), heated to approximately 80°C, to BA and emulsifying it, followed by cooling. This oil-in-water emulsion composition was liquid at 25°C and had an average particle size of 200 nm or less. It also exhibited excellent stability over time, gloss upon application, and lack of stickiness. Mix components (8) to (20) with CB. The DC was filled into a container to obtain a lotion. The lotion obtained in this manner provided a high level of gloss immediately after application to the skin, was non-sticky, and exhibited excellent stability over time.

[0090] Example 32: Impregnated Sheet Cosmetic (component) (mass%) (1) Shea butter (ingredient (B)) 0.5 (2) Rice bran oil (component (B)) 0.5 (3) Squalane (Component (B)) 0.5 (4) PEG-10 Hydrogenated Castor Oil (Component (A)) 0.5 (5) Polyoxyethylene sorbitan monooleate (20 E.O.) (Component (A)) 0.5 (6) PEG / PPG / Polybutylene Glycol-8 / 5 / 3 Glycerin (Component (C)) 2 (7) Purified water (component (D)) 50 (8) Purified water remaining amount (9) Glycerin 6 (10) Diglycerin 1 (11) 1,3-Butylene glycol 5 (12) Ethanol 2 (13) Phenoxyethanol 0.3 (14) Sodium hydroxide 0.15 (15) Hyaluronic acid 0.01 (16) Hydrolyzed collagen 0.01 (17) Sodium edetone 0.02 (18) Sodium carboxymethylcellulose 0.1 (19) Acrylic acid / alkyl methacrylate copolymer 0.2 (20) Carboxyvinyl polymer 0.12

[0091] (Manufacturing method) A. Mix ingredients (1) to (6) uniformly. An oil-in-water emulsion composition was obtained by gradually adding component (7) to BA and emulsifying it. This oil-in-water emulsion composition was liquid at 25°C and had an average particle size of 200 nm or less. It also exhibited excellent stability over time, gloss and non-stickiness upon application. Components (8) to (20) are mixed into the oil-in-water emulsion composition obtained by CB. DC was sealed and filled into an aluminum laminate bag-shaped container to obtain an impregnated sheet cosmetic. The impregnated sheet cosmetic obtained as described above provided high gloss immediately after application to the skin, was non-sticky, and exhibited excellent stability over time.

[0092] Example 33: Hair Mist (component) (mass%) (1) Lauroyl glutamate di(phytosteryl / octyldodecyl) (Component (B)) 1 (2) Diphenylsiloxyphenyl trimethicone (component (B)) 1 (3) PEG-20 Hydrogenated Castor Oil (Component (A)) 1 (4) Quaternium-33 0.1 (5) Polyoxyethylene glycerin (26 E.O.) (Component (C)) 2 (6) Ethyl olive fatty acid (component (B)) 0.2 (7) Purified water (component (D)) 40 (8) Purified water remaining amount (9) Ethanol 10 (10) Phenoxyethanol 0.2 (11) Tremella fuciformis Note 22 0.01 (12) Betaine 1 (13) Citric acid 0.02 (14) Polyquaternium-51 0.01 Note 22: TREMOIST-TP (manufactured by Nippon Seika Co., Ltd.)

[0093] (Manufacturing method) A. Mix ingredients (1) to (6) uniformly. A portion of component (7) was added to BA and mixed until the appearance became semi-transparent, and then the remainder of component (7) was added and emulsified to obtain an oil-in-water emulsion composition. This oil-in-water emulsion composition was liquid at 25°C and had an average particle size of 200 nm or less. It also exhibited excellent stability over time, gloss and non-stickiness when applied. Components (8) to (14) are mixed into the oil-in-water emulsion composition obtained by CB. DC was filled into a mist container to obtain hair mist. The hair mist obtained in this manner provided high shine immediately after application to the hair, was non-sticky, and exhibited excellent stability over time.

[0094] Example 34: Emulsion (component) (mass%) (1) Squalane 5 (2) Cholesterol 3 (3) PEG-60 Hydrogenated Castor Oil 2 (4) Behenyl alcohol 0.5 (5) 1,3-Butylene glycol 7 (6) Glycerin 5 (7) Acrylic acid-alkyl methacrylate copolymer Note 23 0.2 (8) Xanthan gum 0.1 (9) Triethanolamine 0.2 (10) Disodium edetate 0.02 (11) Purified water remaining amount (12)Fragrance 0.05 (13) Phenoxyethanol 0.2 (14) Phytosteryl oleate (Component (B)) 1 (15) PEG-10 Hydrogenated Castor Oil (Component (A)) 0.45 (16) PEG-30 Hydrogenated Castor Oil (Component (A)) 0.6 (17) Polyoxyethylene methyl glucoside (10E.O.) (Component (C)) 3 (18) Purified water (component (D)) 15 Note 23: Pemulen TR-2 (manufactured by Noveon)

[0095] (Manufacturing method) A. Heat components (1) to (6) at 80°C until dissolved. B. Heat ingredients (7) to (13) at 80°C, then add them to A and emulsify. Cool the CB to room temperature. D. Mix ingredients (14) to (17) uniformly. An oil-in-water emulsion composition was obtained by gradually adding component (18) to ED and emulsifying it. This oil-in-water emulsion composition was liquid at 25°C and had an average particle size of 200 nm or less. It also exhibited excellent long-term stability, gloss upon application, and lack of stickiness. C was added to F:E and mixed to obtain an emulsion. The emulsion obtained in this manner provided a high level of gloss immediately after application to the skin, was non-sticky, and exhibited excellent stability over time.

[0096] Example 35: Lotion (component) (mass%) (1) Lauroyl glutamate di(phytosteryl / octyldodecyl) (Component (B)) 2 (2) Squalane (Component (B)) 1 (3) PEG-20 Hydrogenated Castor Oil (Component (A)) 2 (4) Polyoxyethylene glycerin (26 E.O.) (Component (C)) 4 (5) Purified water (component (D)) 35 (6) Purified water remaining amount (7) Glycerin 10 (8) 1,3-Butylene glycol 5 (9) Urea 5 (10) Dipotassium glycyrrhizinate 0.5 (11) Tocopherol acetate 0.5 (12) Phenoxyethanol 0.2 (13) Xanthan gum 0.1

[0097] (Manufacturing method) A. Mix ingredients (1) to (4) uniformly. A portion of component (5) was added to BA and mixed until the appearance became semi-transparent. The remaining component (5) was then added and emulsified to obtain an oil-in-water emulsion composition. This oil-in-water emulsion composition was liquid at 25°C and had an average particle size of 200 nm or less. It also exhibited excellent stability over time, gloss upon application, and lack of stickiness. Mix ingredients (6) to (13) with CB. DC was filled into a container to obtain a lotion. The lotion obtained in this manner provided a high level of gloss immediately after application to the skin, was non-sticky, and exhibited excellent stability over time.

Claims

1. An oil-in-water emulsion composition containing the following components (A) to (D), An oil-in-water emulsion composition in which component (B), emulsified by component (A), is dispersed in an aqueous solvent containing component (C) and component (D), and the average particle size of the emulsion particles is 200 nm or less. (A) A nonionic surfactant comprising at least one type of polyoxyethylene hydrogenated castor oil, having a weighted average HLB of 9 or more and 11 or less. (B) Oily component containing at least one polar oil selected from the group consisting of shea butter, phytosteryl oleate, phytosteryl / octyldodecyl lauroyl glutamate, octyldodecyl / phytosteryl / behenyl lauroyl glutamate, polyglyceryl-10 decaisostearate, dimer dilinoleyl bisisostearyl dimer dilinoleate, and dimer dilinoleyl hydrogenated rosin condensate, having an organic value of 700 or more and an IOB value of 0.07 or more. (C) One or more selected from the group consisting of polyhydric alcohols other than dipropylene glycol and alkylene oxide derivatives. (D) Water

2. The oil-in-water emulsion composition according to claim 1, wherein the polyoxyethylene hydrogenated castor oil of component (A) is polyoxyethylene hydrogenated castor oil having an average number of ethylene oxide addition moles of 20.

3. The oil-in-water emulsion composition according to claim 1 or 2, wherein the component (C) is an alkylene oxide derivative.

4. The oil-in-water emulsion composition according to any one of claims 1 to 3, wherein the alkylene oxide derivative of component (C) is one or more selected from the group consisting of polyoxyethylene glycerin, polyoxypropylene diglyceryl ether, polyoxyethylene methyl glucoside, polyoxypropylene methyl glucoside, and polyoxybutylene polyoxyethylene polyoxypropylene glyceryl ether.

5. The oil-in-water emulsion composition according to any one of claims 1 to 4, wherein the mass ratio of component (A) and component (B) (B) / (A) is 3 or less.

6. The oil-in-water emulsion composition according to any one of claims 1 to 5, wherein the content of at least one polar oil selected from the group consisting of shea butter, phytosteryl oleate, phytosteryl / octyldodecyl lauroyl glutamate, octyldodecyl / phytosteryl / behenyl lauroyl glutamate, polyglyceryl-10 decaisostearate, dimer dilinoleyl bisisostearyl dimer dilinoleate, and dimer dilinoleyl hydrogenated rosin condensate, having an organic value of 700 or more and an IOB value of 0.07 or more, is 50% by mass or more relative to the above component (B).

7. An oil-in-water emulsion composition according to any one of claims 1 to 6, wherein the mass content ratio (A) / {(A)+(B)+(C)} of the aforementioned components (A) to (C) is 0.1 or more.

8. A cosmetic or topical skin preparation comprising the oil-in-water emulsion composition described in claims 1 to 7.

9. Component (A) A nonionic surfactant comprising at least one polyoxyethylene hydrogenated castor oil and having a weighted average HLB of 9 to 11; Component (B) From the group consisting of shea butter, phytosteryl oleate, di(phytosteryl / octyldodecyl) lauroyl glutamate, di(octyldodecyl / phytosteryl / behenyl) lauroyl glutamate, polyglyceryl-10 decaisostearate, dimer dilinoleyl bisisostearyl dimer dilinoleate, and dimer dilinoleyl hydrogenated rosin condensate A method for producing an oil-in-water emulsion composition with an average particle size of 200 nm or less, characterized by mixing an oily component containing at least one polar oil with an organic value of 700 or more and an IOB value of 0.07 or more, and one or more water-soluble solvents selected from the group consisting of polyhydric alcohols and alkylene oxide derivatives excluding component (C) dipropylene glycol, then adding 30 to 500% by mass of component (D) water, which is the total amount of (A), (B), and (C), and then adding the remaining component (D) water.

10. (A) A nonionic surfactant comprising at least one polyoxyethylene hydrogenated castor oil, wherein the weighted average HLB is 9 or more and 11 or less. (B) Oily component containing at least one polar oil with an organic value of 700 or higher and an IOB value of 0.07 or higher (C) One or more water-soluble solvents selected from the group consisting of polyhydric alcohols and alkylene oxide derivatives, excluding dipropylene glycol. (D) Water The present invention contains, wherein component (A) is polyoxyethylene hydrogenated castor oil having an average number of moles of ethylene oxide added of 20, and component (C) contains an alkylene oxide derivative. An oil-in-water emulsion composition in which component (B), emulsified by component (A), is dispersed in an aqueous solvent containing component (C) and component (D), and the average particle size of the emulsion particles is 200 nm or less.

11. A method for producing an oil-in-water emulsion composition having an average particle size of 200 nm or less, characterized by mixing component (A) a nonionic surfactant containing polyoxyethylene hydrogenated castor oil having an average number of added moles of at least one ethylene oxide of 20 and having a weighted average HLB of 9 or more and 11 or less, component (B) an oily component containing at least one polar oil having an organic value of 700 or more and an IOB value of 0.07 or more, and component (C) a water-soluble solvent containing an alkylene oxide derivative, then adding component (D) water in an amount of 30 to 500% by mass of the total amount of (A), (B), and (C), and then adding the remaining component (D) water.

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