Oil-in-water cosmetics

Abstract

To provide an oil-in-water cosmetic that offers excellent storage stability, provides a feeling of thickness when applied in environments ranging from low temperature and low humidity to high temperature and high humidity, and also offers excellent rinseability. [Solution] An oil-in-water cosmetic comprising: component (A), which is at least one oil that is liquid at 25°C and selected from the group consisting of hydrocarbon oils, ester oils, and silicone oils; component (B), which is an ester wax EW consisting of a tetraester TE and a partial ester PE having a specific structure, wherein the TE and PE are in a specific mass ratio; and component (C), which is a surfactant, wherein the total content of component (A) and component (B) is 5 to 50% by mass of 100% by mass of the oil-in-water cosmetic, the mass ratio of component (A) to component (B) ((A):(B)) is 70:30 to 95:5, and the content of component (C) is 1 to 10% by mass.

Description

[Technical Field]

[0001] This invention relates to an oil-in-water cosmetic. [Background technology]

[0002] Oil-in-water cosmetics are characterized by their ability to moisturize the skin and provide a refreshing feel. They are widely used in skincare products such as lotions and moisturizing creams, as well as sunscreens. Given the widespread use of oil-in-water cosmetics, consumer needs are becoming increasingly diverse. For example, in recent years, there has been a growing demand for products that offer a noticeable effect upon application and have a thick, luxurious feel to encourage continued use by consumers. In response to this, Patent Document 1 describes an oil-in-water emulsion composition that combines a volatile oil, a high-melting-point oil, and a liquid higher alcohol, in which the skin-softening effect of the volatile oil and the skin-firming effect of the high-melting-point oil are made more effective by the liquid higher alcohol.

[0003] On the other hand, cosmetics that have a thick texture when applied may have poor rinseability. In contrast, Patent Document 2 describes an oil-in-water cosmetic manufactured by adding an oil to a water-soluble solvent to which an ethylene oxide-additive type hydrophilic nonionic surfactant has been added, and adding water in which a polysaccharide-based thickener has been dissolved either before or after the addition of the oil, which has a superior feel when used and can be easily washed off with water. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2012-214448 [Patent Document 2] Japanese Patent Publication No. 2013-224268 [Overview of the Initiative] Problems to be Solved by the Invention

[0005] In recent years, opportunities to use cosmetics have been increasing even in low-temperature environments such as those for winter sports, and high-temperature environments under scorching summer sun. However, Patent Documents 1 and 2 do not examine whether the thickness of the cosmetic at the time of application can be obtained even in low-temperature low-humidity environments or high-temperature high-humidity environments. In addition, oil-in-water cosmetics are prone to problems such as separation and generation of precipitates during storage, particularly during storage under low-temperature or high-temperature environments.

[0006] An object of the present invention is to provide an oil-in-water cosmetic that has excellent storage stability, allows a user to feel thickness at the time of application in environments ranging from low-temperature low-humidity to high-temperature high-humidity, and has excellent rinsability. Means for Solving the Problems

[0007] The present inventors have found that an oil-in-water cosmetic containing a specific ester wax in a specific ratio has excellent storage stability, allows a user to feel thickness at the time of application in environments ranging from low-temperature low-humidity to high-temperature high-humidity, and also has excellent rinsability, and have completed the present invention.

[0008] That is, the present invention is as follows. [1] An oil-in-water cosmetic comprising the following components (A), (B) and (C), The oil-in-water cosmetic is characterized in that, in 100 mass% of the oil-in-water cosmetic, the total content of the component (A) and the component (B) is 5 to 50 mass%, the mass ratio of the component (A) to the component (B) ((A):(B)) is 70:30 to 95:5, and the content of the component (C) is 1 to 10 mass%. Component (A): At least one oil that is liquid at 25°C selected from the group consisting of hydrocarbon oils, ester oils and silicone oils Component (B): Ester wax EW, comprising a tetraester TE of a linear saturated fatty acid having 14 to 26 carbon atoms and pentaerythritol, and a partial ester PE of a linear saturated fatty acid having 14 to 26 carbon atoms and pentaerythritol, wherein the mass ratio (TE:PE) of the tetraester TE to the partial ester PE is 80:20 to 98:2. Ingredient (C): Surfactant [Effects of the Invention]

[0009] The oil-in-water cosmetic composition of the present invention has excellent storage stability, provides a feeling of thickness when applied in environments ranging from low temperature and low humidity to high temperature and high humidity, and also exhibits excellent rinseability. [Modes for carrying out the invention]

[0010] The embodiments of the present invention will be described below, but the present invention is not limited to the embodiments described herein and can be modified in various ways without departing from the spirit of the invention. Furthermore, the oil-in-water cosmetic composition of the present invention refers to a cosmetic composition in which an oil phase is dispersed within a continuous aqueous component (aqueous phase). In this invention, a low-temperature environment refers to an environment below 5°C, a normal temperature environment refers to an environment between 5°C and 35°C, and a high-temperature environment refers to an environment above 35°C. Furthermore, a low-humidity environment refers to an environment with a relative humidity of less than 45%, a normal humidity environment refers to an environment with a relative humidity of 45°C and 85%, and a high-humidity environment refers to an environment with a relative humidity exceeding 85%. Furthermore, in this invention, a numerical range defined using the symbol "~" includes the numerical values ​​at both ends (upper and lower limits) of "~". For example, "2~10" represents the range of 2 to 10. Furthermore, within the numerical range described in the present invention, the upper or lower limit of that numerical range can be replaced with the values ​​shown in the examples or values ​​uniquely derived from the examples. Furthermore, among the numerical values ​​described to explain the present invention, the numerical values ​​that may include decimal places are, unless otherwise specified, obtained by rounding a digit that was one place smaller than the smallest digit included in the numerical value. Furthermore, in this invention, the number of carbon atoms in a compound or substituent may be expressed as C1, C2, C3, etc. In this case, C1, C2, and C3 mean one carbon atom, two carbon atoms, and three carbon atoms, respectively.

[0011] The oil-in-water cosmetic composition of the present invention contains, as component (A), at least one oil that is liquid at 25°C selected from the group consisting of hydrocarbon oils, ester oils, and silicone oils; as component (B), an ester mixture consisting of a tetraester TE of a linear saturated fatty acid having 14 to 26 carbon atoms and pentaerythritol, and a partial ester PE of a linear saturated fatty acid having 14 to 26 carbon atoms and pentaerythritol, wherein the mass ratio (TE:PE) of the tetraester TE to the partial ester PE is 80:20 to 98:2, and as component (C), a surfactant.

[0012] [Ingredient (A)] The component (A) used in the present invention is at least one oil that is liquid at 25°C, selected from the group consisting of hydrocarbon oils, ester oils, and silicone oils.

[0013] Examples of hydrocarbon oils, though not particularly limited, include saturated or unsaturated hydrocarbons such as liquid paraffin, polybutene, hydrogenated polyisobutene, hydrogenated polydecene, squalane, squalene, pristane, light isoparaffin, light liquid isoparaffin, heavy liquid isoparaffin, tetradecene, isohexadecane, isododecane, α-olefin oligomers, nonane, decane, dodecane, undecane, tridecane, tetradecane, and pentadecane.

[0014] The ester oils are not particularly limited, but examples include vegetable oils such as olive oil, sunflower oil, palm oil, jojoba oil, rapeseed oil, and macadamia nut oil; glycerin and fatty acid esters such as caprylic / capric triglyceride and glyceryl triethylhexanoate (triethylhexanoin); isononyl isononanoate, cetyl ethylhexanoate, ethylhexyl palmitate, isopropyl myristate, octyldodecyl myristate, hexyl laurate, isotridecyl isononanoate, and ethyl oleate. Examples include esters of fatty acids and monohydric aliphatic alcohols such as isopropyl palmitate, esters of fatty acids and polyhydric alcohols such as di(caprylic / capric acid) propylene glycol, propylene glycol diisostearate, polyglyceryl isostearate, pentaerythrityl tetraethylhexanoate, triethyl citrate, diisopropyl sebacate, diisostearyl malate, esters of polyhydric carboxylic acids and hydroxycarboxylic acids with alcohols, and oligoesters such as polyhydroxystearic acid. Other examples of ester oils include homosalate, ethylhexyl salicylate, cinoxate, and ethylhexyl methoxycinnamate.

[0015] Examples of silicone oils are not particularly limited, but include dimethyl silicone oils such as methylpolysiloxane (sometimes called dimethylpolysiloxane or dimethicone), highly polymerized methylpolysiloxane, methylphenyl silicone oils such as methylphenylpolysiloxane, cyclic silicone oils such as methylcyclopolysiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane (cyclopentasiloxane), dodecamethylcyclohexasiloxane, aminopropylmethylsiloxane-dimethylsiloxane copolymer, aminoethylaminopropylsiloxane-dimethylsiloxane copolymer, aminoethylaminopropylmethylsiloxane-dimethylsiloxane copolymer, amodimethicone, and other amino-modified silicones, carboxy-modified silicones, fatty acid-modified silicones, alcohol-modified silicones, aliphatic alcohol-modified silicones, epoxy-modified silicones, fluorine-modified silicones, alkyl-modified silicones, and other modified silicones, as well as methylhydrogenpolysiloxane and dimethiconol.

[0016] The above component (A) can be appropriately selected depending on the application of the oil-in-water cosmetic composition of the present invention and is not particularly limited, but it is preferable to include either a hydrocarbon oil or an ester oil, and more preferably both a hydrocarbon oil and an ester oil, in order to more significantly exhibit the effects of the present invention. Furthermore, in the oil-in-water cosmetic composition of the present invention, the total content of hydrocarbon oil and ester oil in 100 parts by mass of component (A) is not particularly limited, but is preferably 50 to 99 parts by mass, and more preferably 60 to 95 parts by mass, in order to more significantly exhibit the effects of the present invention.

[0017] [Component (B)] The ester wax EW, component (B) used in the present invention, is an ester mixture consisting of a tetraester TE of a linear saturated fatty acid having 14 to 26 carbon atoms and pentaerythritol, and a partial ester PE of a linear saturated fatty acid having 14 to 26 carbon atoms and pentaerythritol, with a mass ratio (TE:PE) of the tetraester TE to the partial ester PE being 80:20 to 98:2.

[0018] (tetraester TE) The tetraester TE contained in the above ester wax EW is a pentaerythritol tetraester represented by the following structural formula (I).

[0019]

Chemical Formula

[0020] The above ester wax EW may contain only one type of compound as the above tetraester TE, or may contain a combination of two or more types of compounds. Note that in the present invention, R 1 CO, R 2 CO, R 3 CO and R 4 CO are not distinguished from each other, and stereoisomers of the compound represented by the above structural formula (I) are regarded as the same tetraester TE. For example, when the carbon numbers of R 1 CO, R 2 CO, R 3 CO and R 4 CO in the above structural formula (I) are denoted as C1, C2, C3 and C4 respectively, the tetraester TE of the following Example (1) and the tetraester TE of the following Example (2) are regarded as the same in the present invention. Example (1): C1=18, C2=20, C3=22, C4=24 Example (2): C1=18, C2=22, C3=20, C4=24

[0021] R in the above structural formula (I) 1 CO, R 2 CO, R 3 CO and R 4CO are each independently linear saturated acyl groups having 14 to 26 carbon atoms, and are residues of linear saturated fatty acids having 14 to 26 carbon atoms used as raw materials. In order to more significantly demonstrate the effects of the present invention, R 1 CO, R 2 CO, R 3 CO and R 4 CO is preferably a linear saturated acyl group with 16 to 24 carbon atoms, independently of each other. 1 CO, R 2 CO, R 3 CO and R 4 It is preferable that the linear saturated acyl group represented by CO contains at least one linear saturated acyl group having 18 to 22 carbon atoms.

[0022] Specific examples of the above-mentioned tetraester TE include pentaerythritol tetrastearate, pentaerythritol tetrabehenate, pentaerythritol tetrapalmitate, pentaerythritol tetraarachidate, pentaerythritol tetralignocellate, pentaerythritol monostearate tribehenate, pentaerythritol monoarachidate tribehenate, pentaerythritol monolignocellate tribehenate, pentaerythritol monopalmitate tristearate, and pentaerythritol monostearate tripalmitate. In particular, to more significantly demonstrate the effects of the present invention, at least one selected from the group consisting of pentaerythritol tetrastearate, pentaerythritol tetrabehenate, pentaerythritol tetrapalmitate, pentaerythritol tetraarachidate, pentaerythritol monostearate tribehenate, and pentaerythritol monoarachidate tribehenate is preferably used, at least one selected from the group consisting of pentaerythritol tetrastearate, pentaerythritol tetrabehenate, pentaerythritol monostearate tribehenate, and pentaerythritol monoarachidate tribehenate is more preferably used, and at least one selected from the group consisting of pentaerythritol tetrastearate and pentaerythritol tetrabehenate is particularly preferably used.

[0023] In this invention, among the one or more tetraesters TE contained in the ester wax EW, the tetraester TE with the highest content is referred to as "tetraester TE A It is referred to as ". In order to more significantly demonstrate the effects of the present invention, the above-mentioned preferred tetraester TE is used. A It is preferable that this be the case. Tetraester TE A The content of is preferably 15 to 95% by mass, more preferably 17 to 80% by mass, and even more preferably 30 to 70% by mass, when the total amount of tetraester TE is 100% by mass, in order to more significantly exhibit the effects of the present invention. Furthermore, the above tetraester TE contained in the ester wax EW of the present invention A This may consist of only one type or two or more types. The above tetraester TE contained in ester wax EW A If there are multiple types, the above tetraester TE A The content of various tetraesters TE A The content shall be such that if the ester wax EW contains only one type of tetraester TE, then the content of that one type of tetraester TE shall be such that the content of tetraester TE A That is the case. In addition, in the present invention, the above tetraester TE A A different tetraester TE is called "tetraester TE B It is sometimes referred to as "[...]."

[0024] (Partial ester) The partial ester PE contained in the above ester wax EW is the R of the compound shown in the above structural formula (I). 2 CO, R 3 CO and R 4This is a compound in which one to three groups selected from the group consisting of CO are replaced with hydrogen atoms (H). The above partial ester PE may be a monoester, diester, or triester. Furthermore, the above ester wax EW may contain only one compound as the partial ester PE, or it may contain a combination of two or more compounds.

[0025] (Linear saturated fatty acids) Examples of linear saturated fatty acids having 14 to 26 carbon atoms used in the above-mentioned tetraester TE and partial ester PE include myristic acid, palmitic acid, margaric acid, stearic acid, arachidic acid, behenic acid, lignoceric acid, and cerotic acid. Among these, at least one selected from the group consisting of palmitic acid, stearic acid, arachidic acid, behenic acid, and lignoceric acid is preferably used, and at least one selected from the group consisting of stearic acid, arachidic acid, and behenic acid is more preferably used, in order to more significantly exhibit the effects of the present invention. From a similar viewpoint, it is preferable that the above-mentioned linear saturated fatty acids having 14 to 26 carbon atoms contain linear saturated fatty acids having 18 to 22 carbon atoms in a proportion of 90% by mass or more, and more preferably 95% by mass or more.

[0026] Furthermore, in order to more significantly demonstrate the effects of the present invention, it is more preferable that the straight-chain saturated fatty acid having 14 to 26 carbon atoms is only a straight-chain saturated fatty acid having 16 to 24 carbon atoms. The above-mentioned linear saturated fatty acids having 14 to 26 carbon atoms may consist of only one type of fatty acid, or may contain a combination of two or more types of fatty acids. The amount of the fatty acid with the highest content among the fatty acids contained in the above-mentioned linear saturated fatty acids having 14 to 26 carbon atoms is not particularly limited, but in order to more significantly demonstrate the effects of the present invention, it is preferable that it be 60% by mass or more, more preferably 70% by mass or more, and even more preferably 80% by mass or more, when the total amount of linear saturated fatty acids having 14 to 26 carbon atoms is taken as 100% by mass. Similarly, it is preferable that it be 99% by mass or less, more preferably 94% by mass or less, and even more preferably 92% by mass or less. In order to more significantly demonstrate the effects of the present invention, it is preferable that the above-mentioned preferred fatty acid is the fatty acid with the highest content.

[0027] (Mass ratio of tetraesters to partial esters) In the above-mentioned ester wax EW, the mass ratio of tetraester TE to partial ester PE (TE:PE) is 80:20 to 98:2. Therefore, when the mass of the above-mentioned ester wax EW is taken as 100% by mass, the content of tetraester TE is 80 to 98% by mass, and the content of partial ester PE is 2 to 20% by mass. To more significantly enhance the effects of the present invention, the above mass ratio (TE:PE) is preferably 90:10 to 96:4. When the ester wax EW contains two or more types of tetraester TE, the tetraester TE content is the total content of the multiple types of tetraester TE. When the ester wax EW contains two or more types of partial ester PE, the partial ester PE content is the total content of the multiple types of partial ester PE. The content of each component constituting the ester wax EW can be calculated, for example, from the amount of raw materials added during manufacturing, or it can be measured by analyzing the ester wax EW using gas chromatography (GC).

[0028] (Wax composition W) Component (B), which is the ester wax EW described above, is used, for example, by melting and mixing it with component (A) etc. during the production of the oil-in-water cosmetic composition of the present invention. During the production of the oil-in-water cosmetic composition of the present invention, a wax composition W containing the tetraester TE and the partial ester PE described above, and a different component (which may be referred to as "component X" in the present invention) may be mixed with component (A) etc. to produce an ester wax EW consisting of a predetermined tetraester TE and partial ester PE. Examples of component X include linear saturated fatty acids having 14 to 26 carbon atoms and pentaerythritol derived from the raw materials of the tetraester TE and partial ester PE, as well as esters of pentaerythritol with fatty acids different from the linear saturated fatty acids having 14 to 26 carbon atoms that were contained in the raw material fatty acids. In this way, when the wax composition W is formulated to satisfy the conditions for ester wax EW as component (B) during the production of the oil-in-water cosmetic composition of the present invention, component X contained in the wax composition W is treated as a different component from the above components (A) and (B) of the oil-in-water cosmetic composition of the present invention, as well as component (C) described later, and is treated as a different component described later.

[0029] Furthermore, the ester wax EW or wax composition W before being added to the oil-in-water cosmetic composition of the present invention may be a composition obtained by uniformly melting and mixing the components beforehand, or a composition obtained by physically mixing finely ground materials of each component.

[0030] In the above wax composition W, the content of the ester wax EW is not particularly limited, but may be, for example, 90 to 100% by mass, or 95 to 99% by mass. In the above wax composition W, the content of component X is not particularly limited, but may be, for example, 0 to 10% by mass, or 1 to 5% by mass.

[0031] (Method for manufacturing wax composition W) Examples of methods for producing the above-mentioned wax composition W include adjusting the composition of the raw materials, fatty acids and pentaerythritol, so that the mass ratio (TE:PE) of the tetraester TE and the partial ester PE contained in the wax composition W is 80:20 to 98:2, and then carrying out the esterification reaction.

[0032] Furthermore, as an example of a method for producing the wax composition W, a method can be given that includes the steps of obtaining a crude ester product of a linear saturated fatty acid having 14 to 26 carbon atoms and pentaerythritol, and purifying the crude product. The process of obtaining a crude ester product of a linear saturated fatty acid having 14 to 26 carbon atoms and pentaerythritol is carried out, for example, by dehydration condensation reaction between a raw material fatty acid containing a linear saturated fatty acid having 14 to 26 carbon atoms and pentaerythritol. The above raw material fatty acids mainly consist of straight-chain saturated fatty acids having 14 to 26 carbon atoms, and their purity may be less than 100% by mass. Preferably, the main component is a straight-chain saturated fatty acid having 18 to 22 carbon atoms. In the present invention, the purity of the raw material fatty acids is the content of the most abundant fatty acid when the total amount of raw material fatty acids is 100% by mass. Furthermore, the above raw material fatty acids may consist only of straight-chain saturated fatty acids having 14 to 26 carbon atoms, or only of straight-chain saturated fatty acids having 16 to 24 carbon atoms. Alternatively, the above raw material fatty acids may contain components other than straight-chain saturated fatty acids having 14 to 26 carbon atoms. Although not particularly limited, in order to more significantly demonstrate the effects of the present invention, the content of straight-chain saturated fatty acids having 14 to 26 carbon atoms in 100% by mass of the total amount of the above raw material fatty acids is preferably 95% by mass or more, and more preferably 99% by mass or more. The crude ester product of straight-chain saturated fatty acids with 14-26 carbon atoms and pentaerythritol is tetraester TE, which has the highest content. A It contains at least a partial ester PE. When a raw material fatty acid containing two or more straight-chain saturated fatty acids with 14 to 26 carbon atoms is used, the crude product is usually tetraester TE as the main product. A It contains tetraester TE as a by-product. BThe product also contains partial ester PE. The amount of partial ester PE produced can be adjusted by the ratio of raw materials and reaction conditions. In the step of purifying the crude product, it is preferable to reduce the content of unreacted raw material fatty acids contained in the crude product. Examples of purification methods include distillation, recrystallization, and liquid-liquid treatment using a basic aqueous solution. It is particularly preferable to reduce the content of unreacted fatty acids by liquid-liquid treatment using a basic aqueous solution. In the step of purifying the crude product, the wax composition W may be obtained by purifying the crude product. Alternatively, the wax composition W may be obtained by purifying the crude product to obtain the purified ester, and then mixing the purified ester with an ester of a separately prepared linear saturated fatty acid having 14 to 26 carbon atoms and pentaerythritol.

[0033] [Component (C)] The oil-in-water cosmetic composition of the present invention contains a surfactant as component (C). This allows for the easy formation of an oil-in-water emulsion. The surfactant may be at least one selected from the group consisting of nonionic surfactants and ionic surfactants, and among these, it is preferable to include a nonionic surfactant, more preferably a nonionic surfactant with an HLB value of 4 or higher, and even more preferably a nonionic surfactant with an HLB value of 8 to 18. The HLB value of nonionic surfactants can be determined by the ATLAS method, and specifically, it can be calculated using the following formula (1). HLB value = 20 × [1 - (S / A)] (1) In formula (1) above, S is the saponification value (mgKOH / g) of the nonionic surfactant, and A is the acid value (mgKOH / g) of the fatty acid constituting the nonionic surfactant.

[0034] Specific examples of nonionic surfactants are not limited to these, but include, for example, nonionic surfactants having a polyoxyethylene group in the hydrophilic group, such as polyoxyethylene phytosterols such as PEG-5 phytosterol and PEG-30 phytosterol; polyoxyethylene cholesteryl ethers such as Choleth-10; polyoxyethylene saturated fatty acid esters such as PEG-150 stearate, PEG-75 stearate, PEG-55 stearate, PEG-40 stearate, PEG-10 laurate, and PEG-30 glyceryl diisostearate; and ole Examples include polyoxyethylene unsaturated fatty acid esters such as PEG-10 oleate; polyoxyethylene sorbitan fatty acid esters such as polysorbate 80 (also known as polyoxyethylene sorbitan monooleate (20 E.O.)) and polyoxyethylene sorbitan monostearate (20 E.O.) (polysorbate 60); polyoxyethylene sorbitan fatty acid esters such as PEG-40 sorbitan oleate; and polyoxyethylene hydrogenated castor oils such as PEG-80 hydrogenated castor oil, PEG-60 hydrogenated castor oil, and PEG-40 hydrogenated castor oil. Furthermore, examples of nonionic surfactants having a polyglyceryl group in the hydrophilic group include polyglyceryl fatty acid esters such as polyglyceryl-5 stearate, polyglyceryl-10 stearate, polyglyceryl-5 laurate, polyglyceryl-10 laurate, polyglyceryl-10 oleate, and polyglyceryl-10 diisostearate.

[0035] Furthermore, examples of nonionic surfactants include glyceryl fatty acid esters such as glyceryl stearate, glyceryl isostearate, glyceryl oleate, and glyceryl behenate; polyoxyethylene alkyl ethers such as steareth-25; and sorbitan fatty acid esters such as sorbitan sesquioleate. In this invention, an ester that is liquid at 25°C may be used as component (C). Among esters that are liquid at 25°C, those with an HLB value of 4 or higher are used as component (C), and those with an HLB value of less than 4 are used as component (A). Here, the HLB value is an integer value obtained by rounding to the first decimal place.

[0036] Examples of anionic surfactants include N-acyl amino acids such as N-lauroyl-L-glutamic acid, N-stearoyl-L-glutamic acid, N-myristoyl-L-glutamic acid, and other N-acyl glutamic acids; fatty acids, alkyl ether carboxylic acids, polyoxyethylene alkyl ether carboxylic acids, acyl lactic acid, N-acylmethylalanine, N-acyl sarcosine, diacyl amino acids and their salts, and other carboxylate salts; alkanesulfonic acids, α-olefin sulfonic acids, α-sulfo fatty acid methyl esters, and acyl isethic acid. Examples include sulfonates such as onic acid, alkyl sulfosuccinate, N-acylmethyltaurine such as N-myristoyl-N-methyltaurine, N-lauroyl-N-methyltaurine, and N-stearoyl-N-methyltaurine, and their salts; sulfates such as alkyl sulfates, polyoxyethylene alkyl sulfates, alkyl ether sulfates, polyoxyethylene alkyl ether sulfates, fatty acid alkanolamide sulfates, and their salts; and phosphates such as alkyl phosphates, polyoxyethylene alkyl ether phosphates, and their salts.

[0037] Examples of cationic surfactants, which are ionic surfactants, include monoalkyltrimethylammonium salts such as octyltrimethylammonium chloride, decyltrimethylammonium chloride, lauryltrimethylammonium chloride, tetradecyltrimethylammonium chloride, hexadecyltrimethylammonium chloride, hexadecyltrimethylammonium bromide, stearyltrimethylammonium chloride (steartrimonium chloride), and behenyltrimethylammonium chloride (behentrimonium chloride); dialkyldimethylammonium salts such as didecyldimethylammonium chloride and distearyldimethylammonium chloride; and trialkylmethylammonium salts.

[0038] [Content of ingredients (A), (B), and (C)] In the oil-in-water cosmetic composition of the present invention, the content of component (A) in 100% by mass of the oil-in-water cosmetic composition is not particularly limited, but in order to more significantly exhibit the effects of the present invention, it may be, for example, 5 to 30% by mass or 5 to 20% by mass. In this invention, component (A) can be one of the liquid oils described above, or a combination of two or more.

[0039] In the oil-in-water cosmetic composition of the present invention, the content of component (B), which is the ester wax EW, in 100% by mass of the oil-in-water cosmetic composition is not particularly limited, but it may be, for example, 1 to 5% by mass, in order to more significantly exhibit the effects of the present invention.

[0040] In the oil-in-water cosmetic composition of the present invention, the total content of component (A) and component (B) is 5 to 50% by mass of 100% by mass of the oil-in-water cosmetic composition, and the mass ratio of component (A) to component (B) ((A):(B)) is 70:30 to 95:5. While not particularly limited, the total content of component (A) and component (B) is preferably 8 to 45% by mass, more preferably 10 to 45% by mass, even more preferably 10 to 30% by mass, and even more preferably 10 to 20% by mass, in order to more significantly achieve the effects of the present invention. Furthermore, in order to more significantly achieve the effects of the present invention, the mass ratio ((A):(B)) of component (A):(B) is preferably 80:20 to 90:10.

[0041] In 100% by mass of the oil-in-water cosmetic composition of the present invention, the content of component (C) is 1 to 10% by mass, and preferably 2 to 8% by mass, in order to more significantly exhibit the effects of the present invention. Furthermore, in order to more significantly demonstrate the effects of the present invention, the total content of component (A), component (B), and component (C) in 100% by mass of the oil-in-water cosmetic composition is 6 to 60% by mass.

[0042] In this invention, when the numerical values ​​representing the content of each component (A), component (B), and component (C), the total content of two or more of these, and the mass ratios of (A):(B) and TE:PE are integer values, these integer values ​​are obtained by rounding to the first decimal place. When determining the total content of two or more components, the numerical values ​​for the content of each component are rounded to the first decimal place by rounding to the second decimal place. When determining the mass ratio, the numerical values ​​for the mass of each component are rounded to the first decimal place by rounding to the second decimal place.

[0043] [Other ingredients] The oil-in-water cosmetic composition of the present invention may further contain other optional components (other components) different from those described above, as long as they do not impair its effects.

[0044] The oil-in-water cosmetic composition of the present invention contains water as another component. Examples of water include purified water such as distilled water and deionized water, as well as tap water and industrial water. To more clearly demonstrate the effects of the present invention, the water content in 100% by mass of the oil-in-water cosmetic composition of the present invention is preferably 30 to 94% by mass, more preferably 40 to 90% by mass, and even more preferably 50 to 85% by mass.

[0045] The oil-in-water cosmetic composition of the present invention may, in addition to the above-mentioned components (A), (B), (C) and water, contain other components, such as fatty acids and pentaerythritol derived from the raw materials used in the preparation of component (B), or may contain fatty acids and pentaerythritol added separately from the unreacted raw materials, as long as their effects are not impaired.

[0046] Other ingredients may include those commonly found in cosmetics, such as waxes, colorants, moisturizers, thickeners, preservatives, antibacterial agents, UV scattering agents, UV absorbing agents, antioxidants, beauty ingredients, organic solvents, etc., which are different from ingredient (B) mentioned above.

[0047] Examples of waxes different from component (B) above include solid oils and fats such as hydrogenated castor oil, hydrogenated palm oil, and hydrolyzed rapeseed oil; hydrocarbon waxes such as polyethylene wax, Fischer-Tropsch wax, and microcrystalline wax; synthetic ester waxes different from the ester wax EW of the present invention, such as behenyl behenate and arachidyl behenate; and natural waxes such as sunflower seed wax, carnauba wax, candelilla wax, hydrogenated jojoba oil, and rice bran wax.

[0048] As colorants, those commonly used in cosmetics may be used, for example, metal oxides such as titanium dioxide, zinc oxide, cerium oxide, aluminum oxide, yellow iron oxide, black iron oxide, red iron oxide, Prussian blue, ultramarine blue, chromium oxide, and chromium hydroxide; metal complexes such as manganese violet and cobalt titanate; and inorganic pigments such as carbon black; synthetic organic pigments such as Red No. 3, Red No. 104, Red No. 106, Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 226, Red No. 227, Red No. 228, Red No. 230, Red No. 401, Red No. 405, Red No. 505, Orange No. 203, Orange No. 204, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow No. 401, Blue No. 1, and Blue No. 404; and natural organic pigments such as β-carotene, caramel, and paprika pigment.

[0049] Examples of thickeners include partially cross-linked organopolysiloxanes such as dimethicone crosspolymer, (dimethicone / vinyl dimethicone) crosspolymer, (dimethicone / phenyl vinyl dimethicone) crosspolymer, (vinyl dimethicone / lauryl dimethicone) crosspolymer, (dimethicone / vinyl trimethylsiloxysilicate) crosspolymer, and (dimethicone / vinyl dimethicone) crosspolymer; dextrin palmitate, (palmitic acid / ethylhexanoic acid) dextrin, dextrin stearate, (palmitic acid / Examples include dextrin fatty acid esters such as dextrin stearic acid, dextrin oleate, dextrin isopalmitate, and dextrin isostearate; sucrose fatty acid esters such as sucrose stearate and sucrose stearate acetate; inulin stearate; starch fatty acid esters; and metal soaps such as aluminum isostearate, hydroxystearic acid, calcium stearate, aluminum stearate, magnesium stearate, aluminum myristate, and magnesium myristate.

[0050] Examples of antioxidants include tocopherol and ascorbic acid. Examples of beauty ingredients include vitamins, anti-inflammatory agents, and herbal medicines. Examples of preservatives include paraoxybenzoic acid esters, phenoxyethanol, and the like.

[0051] Examples of ultraviolet scattering agents include fine particle metal oxides such as zinc oxide, titanium oxide, and cerium oxide, aggregates thereof, composite powders thereof, and the like. Examples of ultraviolet absorbers include hexyl diethylaminohydroxybenzoylbenzoate, oxybenzone-6, ethylhexyl triazone, bis-ethylhexyloxyphenol methoxyphenyl triazine, and the like.

[0052] The use of the oil-in-water type cosmetic of the present invention is not particularly limited, and examples thereof include cream cosmetics, milky lotions, oil-in-water type sunscreens, and the like. [Examples]

[0053] Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples. In addition, "parts" and "%" are based on mass unless otherwise specified.

[0054] In the following, the acid value was measured in accordance with JOCS (Japan Oil Chemists' Society) 2.3.1-1996.

[0055] In addition, the conditions for gas chromatography (GC) were set as follows. <GC Conditions> Gas chromatograph: manufactured by Shimadzu Corporation, Nexis GC-2030 Column: manufactured by RESTEK, MXT (registered trademark)-1HT Sim Dist Column temperature: The temperature was raised from an initial temperature of 100°C to 430°C at a rate of 10°C / min, and held at 430°C for 10 minutes. Injection temperature: 430°C Detection temperature: 430°C

[0056] [Synthesis of Wax Composition] Using the raw material fatty acids shown in Table 1 and pentaerythritol, wax compositions W-1 to W-12 shown in Table 2 were obtained by the method shown in the synthesis example below. Furthermore, the raw material fatty acids FA-1 to FA-7 contained multiple types of straight-chain saturated fatty acids with different numbers of carbon atoms, as shown in Table 1. In the raw material fatty acids shown in Table 1, the carbon atoms C12, C14, C16, C18, C20, C22, C24, C26, C28, and C30 represent the carbon atoms of the straight-chain saturated fatty acids, respectively. Table 1 also shows the mass percentage (mass%) of each straight-chain saturated fatty acid contained in each raw material fatty acid.

[0057] <Synthesis Example 1: Synthesis of Wax Composition W-1> In a 3 L four-necked flask equipped with a thermometer, nitrogen inlet tube, stirring blade, and condenser, 200 g (1.47 mol) of pentaerythritol and 2058.5 g (6.05 mol) of fatty acid FA-1 were added and reacted at 240 °C under a nitrogen stream. The resulting crude ester product was 2232.3 g with an acid value of 8.7 mg KOH / g. To the crude ester product, 900 g of toluene and 500 g of 2-propanol were added, and a 10% by mass potassium hydroxide aqueous solution containing an amount of potassium hydroxide equivalent to 2.0 times the residual acid value of the crude ester product was added. The mixture was stirred at 70°C for 30 minutes. After that, it was allowed to stand for 30 minutes to separate and remove the aqueous layer (lower layer). The mixture was washed with water four times until the pH of the wastewater became neutral. The solvent in the remaining ester layer was removed by distillation under reduced pressure of 1 kPa at 180°C, and the mixture was filtered to obtain 1800.7 g of wax composition W-1.

[0058] <Synthesis Example 2: Synthesis of Wax Composition W-2> In a 3 L four-necked flask equipped with a thermometer, nitrogen inlet tube, stirring blade, and condenser, 200 g (1.47 mol) of pentaerythritol and 2020.7 g (6.05 mol) of fatty acid FA-2 were added and reacted at 240 °C under a nitrogen stream. The resulting crude ester product was 2202.3 g with an acid value of 8.1 mg KOH / g. To the crude ester product, 900 g of toluene and 500 g of 2-propanol were added, and a 10% by mass potassium hydroxide aqueous solution containing an amount of potassium hydroxide equivalent to 2.0 times the residual acid value of the crude ester product was added. The mixture was stirred at 70°C for 30 minutes. After standing for 30 minutes, the aqueous layer (lower layer) was separated and removed. The mixture was washed with water four times until the pH of the wastewater became neutral. The solvent in the remaining ester layer was removed by distillation under reduced pressure of 1 kPa at 180°C, and the mixture was filtered to obtain 1785.7 g of wax composition W-2.

[0059] <Synthesis Example 3: Synthesis of Wax Composition W-3> Wax composition W-3 was obtained in the same manner as in Synthesis Example 2, except that the amount of fatty acid FA-2 added was changed to 1963.9 g (5.88 mol).

[0060] <Synthesis Example 4: Synthesis of Wax Composition W-4> Wax composition W-4 was obtained in the same manner as in Synthesis Example 1, except that fatty acid FA-3 was used instead of fatty acid FA-1.

[0061] <Synthesis Example 5: Synthesis of Wax Composition W-5> Wax composition W-5 was obtained in the same manner as in Synthesis Example 1, except that fatty acid FA-4 was used instead of fatty acid FA-1.

[0062] <Synthesis Example 6: Synthesis of Wax Composition W-6> Wax composition W-6 was obtained in the same manner as in Synthesis Example 1, except that fatty acid FA-5 was used instead of fatty acid FA-1.

[0063] <Synthesis Example 7: Synthesis of Wax Composition W-7> Wax composition W-7 was obtained in the same manner as in Synthesis Example 2, except that the amount of fatty acid FA-2 used was changed to 2158.0 g (6.46 mol).

[0064] <Synthesis Example 8: Synthesis of Wax Composition W-8> A crude ester product was obtained in the same manner as in Synthesis Example 2. The acid value of the crude product was 8.1 mg KOH / g. This was designated as wax composition W-8.

[0065] <Synthesis Example 9: Synthesis of Wax Composition W-9> Wax composition W-9 was obtained in the same manner as in Synthesis Example 2, except that the amount of fatty acid FA-2 added was changed to 2354.2 g (7.06 mol).

[0066] <Synthesis Example 10: Synthesis of Wax Composition W-10> Wax composition W-10 was obtained in the same manner as in Synthesis Example 2, except that the amount of fatty acid FA-2 used was changed to 1806.8 g (5.41 mol).

[0067] <Synthesis Example 11: Synthesis of Wax Composition W-11> Wax composition W-11 was obtained in the same manner as in Synthesis Example 1, except that fatty acid FA-6 was used instead of fatty acid FA-1.

[0068] <Synthesis Example 12: Synthesis of Wax Composition W-12> Wax composition W-12 was obtained in the same manner as in Synthesis Example 1, except that fatty acid FA-7 was used instead of fatty acid FA-1.

[0069] Wax compositions W-1 to W-10 contained a mixture of esters of linear saturated fatty acids having 14 to 26 carbon atoms and pentaerythritol. The ester mixtures in wax compositions W-1 to W-10 were designated as ester waxes EW-1 to EW-10, respectively. Wax composition W-11 contained a mixture of esters of a straight-chain saturated fatty acid having 12 to 14 carbon atoms and pentaerythritol. The ester mixture in wax composition W-11 was designated as ester wax EW-11. Wax composition W-12 contained a mixture of esters of a straight-chain saturated fatty acid having 28 to 30 carbon atoms and pentaerythritol. The ester mixture in wax composition W-12 was designated as ester wax EW-12.

[0070] Furthermore, in each of the wax compositions W-1 to W-12, compounds different from the esters of the raw material fatty acid and pentaerythritol were designated as components X-1 to X-12. When the content of components X-1 to X-12 is expressed as an integer value rounded to the first decimal place, the content of components X-1 to X-7 and X-9 to X-12 in wax compositions W-1 to W-7 and W-9 to W-12 is all 0% by mass, and the content of component X-8 in wax composition W-8 is 5% by mass. Note that wax composition W-8 contained C20 linear saturated fatty acids and C22 linear saturated fatty acids contained in the raw material fatty acid FA-2 in amounts of 1% by mass and 4% by mass, respectively.

[0071] Table 2 shows the raw material fatty acids used in the synthesis of wax composition W, the numbers of the ester waxes EW contained in wax composition W, and their content P. EW (by mass%), and the number of component X contained in the wax composition W and its content P. X (Indicates mass %). Note that P EW and P X These values ​​represent the content of ester wax EW and component X, respectively, when the mass of wax composition W is taken as 100% by mass. Table 2 also shows the mass ratio (TE:PE) of tetraester TE and partial ester PE that constitute the ester wax EW.

[0072] Table 3 shows the composition of tetraester TE and partial ester PE contained in each of the ester waxes EW-1 to EW-12. For tetraester TE, A The content, i.e., the highest content tetraester TE when the total amount of tetraester TE is taken as 100% by mass. A The content (mass%) of each component is shown. For partially ester PE, the content (mass%) of monoester, diester, and triester is shown when the total amount of partially ester PE is taken as 100% by mass. Furthermore, TE has the highest content. AThe content of each tetraester TE was determined by calculating the content (mass%) of each tetraester TE when the total content of tetraester TE is set to 100 mass%, based on the ratio of peak areas of the GC chart obtained by gas chromatography (GC) under the above GC conditions and the total content of tetraester TE, and then identifying the maximum amount among them. The respective content of monoesters, diesters, and triesters constituting the partial ester PE was determined by calculating the content (mass%) of each monoester, diester, and triester when the total content of partial ester PE was set to 100 mass%, based on the ratio of peak areas of the GC chart obtained by gas chromatography (GC) under the above GC conditions and the total content of partial ester PE.

[0073] [Table 1]

[0074] [Table 2]

[0075] [Table 3]

[0076] <Preparation of oil-in-water cosmetic> Oil-in-water cosmetic compositions for Examples 1-23 and Comparative Examples 1-15 were prepared using the following model formulations.

[0077] [Model formulations of cream: Examples 1-12 and Comparative Examples 1-6] Model samples of cream cosmetics for the evaluation described below were prepared according to the formulations shown in Table 4. Specifically, component (A) and a wax composition W containing component (B) were melted and mixed at 90°C. Other components (excluding glycerin, butylene glycol, water, and component X) and component (C) were added and further melted and mixed. After confirming that the system was homogeneous, a mixed solvent of glycerin, butylene glycol, and water was added dropwise to the system to emulsify it. The resulting emulsion was poured into a cylindrical container and cooled to prepare model samples of the creams for Examples 1 to 12 and Comparative Examples 1 to 6 shown in Table 7. Note that "β" in Table 4 represents the amount of wax composition W added, and wax composition W containing ester wax EW as shown in Table 7 was used. Table 7 shows the number of ester wax EW contained as component (B) in the model sample and its content (β × P). EW This indicates ( / 100).

[0078] [Table 4]

[0079] [Model formulations of sunscreen agents: Examples 13-16 and Comparative Examples 7-10] Model samples of sunscreens for the evaluation described below were prepared according to the formulations shown in Table 5. Specifically, component (A) and a wax composition W containing component (B) were melted and mixed at 90°C. Other components (excluding glycerin, butylene glycol, water, and component X) and component (C) were added and further melted and mixed. After confirming that the system was homogeneous, a mixed solvent of glycerin, butylene glycol, and water was added dropwise to the system to emulsify it. The resulting emulsion was poured into a cylindrical container and cooled to prepare model samples of sunscreens for Examples 13-16 and Comparative Examples 7-10 shown in Table 8. Note that "β" in Table 5 represents the amount of wax composition W added, and wax composition W containing ester wax EW as shown in Table 8 was used. Table 8 shows the number of ester wax EW contained as component (B) in the model sample and its content (β × P). EW This indicates ( / 100).

[0080] [Table 5]

[0081] [Model formulations for emulsion: Examples 17-23 and Comparative Examples 11-15] Model samples of emulsion cosmetics for the evaluation described below were prepared according to the formulations shown in Table 6. Specifically, component (A) and a wax composition W containing component (B) were melted and mixed at 90°C. Other components (excluding glycerin, butylene glycol, water, and component X) and component (C) were added and further melted and mixed. After confirming that the system was homogeneous, a mixed solvent of glycerin, butylene glycol, and water was added dropwise to the system to emulsify it. The resulting emulsion was poured into a cylindrical container and cooled to prepare model samples of the emulsions for Examples 17-23 and Comparative Examples 11-15 shown in Table 9. The amount (α) of the C13-15 alkane ((C13-15) alkane) used as component (A) and the amount (α) of olive oil added were the same. The specific amounts added are shown in Table 9. "β" in Table 6 represents the amount of wax composition W added, and wax composition W containing ester wax EW as shown in Table 9 was used. Table 9 shows the number of the ester wax EW contained as component (B) in the model sample and its content (β × P). EW This indicates ( / 100). Also, "4.00-γ" shown in Table 6 is the amount of polyglyceryl-5 stearate, which is component (C), added, and the value of "γ" is shown in Table 9.

[0082] [Table 6]

[0083] [evaluation] The following evaluations were performed on the model samples of creams from Examples 1-12 and Comparative Examples 1-6 (Table 7), the model samples of sunscreens from Examples 13-16 and Comparative Examples 7-10 (Table 8), and the model samples of emulsions from Examples 17-23 and Comparative Examples 11-15 (Table 9).

[0084] [Evaluation of storage stability] The condition of model samples was examined after static storage at 4°C and 40°C for one month, and their storage stability was determined as follows. The results are shown in Tables 7-9. <Judgment criteria> No separation or precipitates were observed in the model sample after storage at either 4°C or 40°C. ×: Separation or precipitation was observed in the model sample after storage at either 4°C or 40°C.

[0085] [Evaluation of rinsability] Twenty expert panelists evaluated the rinsability of model samples applied to skin. Specifically, each panelist spread 1g of the model sample on the skin of their forearm, then rinsed the area with tap water, and assessed the feel of the skin after rinsing and wiping off the water, assigning a score of 1 to 3 points based on the following criteria. (standard) 3 points: Easy to rinse off, and leaves skin feeling refreshed after rinsing. Points 2: It rinses off easily, but leaves a slightly oily feeling on the skin after rinsing. 1 point: It rinses off easily, but leaves an oily feeling on the skin after rinsing. 0 points: Difficult to rinse off, leaves a greasy, sticky feeling on the skin, and lingers with a strong oily sensation.

[0086] Furthermore, the rinsability of the model samples was evaluated using the average score of all panelists, according to the following criteria. Tables 7-9 show the evaluation results and the average scores. <Judgment criteria> (Judgment): (Average score) ◎: Exceeding 2.6 ○: 2.3 or more, 2.6 or less △: 2.0 or higher, less than 2.3 ×: Less than 2.0

[0087] [Evaluation of coating thickness] Twenty expert panelists evaluated the thickness of two model samples applied to the forearm under the same conditions: one after being left for one week in a low-temperature, low-humidity environment (4°C, 40% relative humidity) and another after being left for one week in a high-temperature, high-humidity environment (40°C, 90% relative humidity). Based on the thickness obtained under both conditions, each panelist assigned a score from 0 to 3 points according to the evaluation criteria below. <Evaluation Criteria> (Rating): (Evaluation result) 3 points: I felt that it was very thick in both environments (low temperature, low humidity and high temperature, high humidity). Two points: In one of two environments—low temperature and low humidity, and high temperature and high humidity—the thickness felt very high, but in the other, the thickness felt only moderate. 1 point: In both environments (low temperature, low humidity and high temperature, high humidity), I felt the thickness was only slightly above average. 0 points: The material felt thin in either a low-temperature, low-humidity environment or a high-temperature, high-humidity environment, or both.

[0088] Furthermore, using the average score of all panelists, the coating thickness of the model samples in low-temperature, low-humidity and high-temperature, high-humidity environments was judged according to the following criteria. Tables 7-9 show the judgment results and the average scores. <Judgment criteria> (Judgment): (Average score) ◎: Exceeding 2.6 ○: 2.3 or more, 2.6 or less △: 2.0 or higher, less than 2.3 ×: Less than 2.0

[0089] [Table 7]

[0090] [Table 8]

[0091] [Table 9]

[0092] The model samples of Examples 1 to 23 were oil-in-water cosmetic compositions of the present invention, containing component (A), which is at least one oil that is liquid at 25°C and selected from the group consisting of hydrocarbon oils, ester oils, and silicone oils; component (B), which is an ester wax EW consisting of tetraester TE and partial ester PE in a mass ratio (TE:PE) of 80:20 to 98:2; and component (C), which is a surfactant, wherein the total content of component (A) and component (B) is 5 to 50% by mass, the mass ratio of component (A) to component (B) is 70:30 to 95:5, and the content of component (C) is 1 to 10% by mass. The model samples of Examples 1 to 23 were oil-in-water cosmetic compositions of the present invention that exhibited excellent storage stability and rinseability, and provided a feeling of thickness upon application in both low-temperature, low-humidity and high-temperature, high-humidity environments. On the other hand, the model samples of Comparative Examples 1, 7, and 11 contained ester wax EW-9 with a low content of partial ester PE. The model samples of Comparative Examples 2, 8, and 12 contained ester wax EW-10 with a high content of partial ester PE. The model samples of Comparative Examples 3 and 13 contained ester wax EW-11, which consists of an ester of a linear saturated fatty acid with 12 to 14 carbon atoms and pentaerythritol. The model samples of Comparative Examples 4 and 9 contained ester wax EW-12, which consists of an ester of a linear saturated fatty acid with 28 to 30 carbon atoms and pentaerythritol. The model samples of Comparative Examples 5 and 10 had a large mass ratio of component (A). The model samples of Comparative Examples 6 and 15 had a large mass ratio of component (B). The model sample of Comparative Example 14 had a small total content of component (A) and component (B). The model samples in these comparative examples were inferior to the model samples in Examples 1-23 in at least one of the following aspects: storage stability, rinseability, and coating thickness.

[0093] Next, Tables 10 to 13 show model formulations of oil-in-water cosmetic compositions of the present invention, including hair treatment, hair milk, hair wax, and oil-in-water liquid foundation, respectively.

[0094] Model samples of the formulations shown in Tables 10 to 13 were prepared by melting and mixing component (A) and wax composition W-2, then adding other components (excluding the solvent) and component (C), melting and mixing them further, confirming that the system was homogeneous, then emulsifying by dropping the solvent into the system, pouring the resulting emulsion into a container, and cooling it.

[0095] The oil-in-water cosmetic formulations shown in Tables 10 to 13 are also, Excellent storage stability, It provided a noticeable thickness during application in environments ranging from low temperature and low humidity to high temperature and high humidity, while also exhibiting excellent rinsability.

[0096] [Table 10]

[0097] Table 11

[0098] Table 12

[0099] Table 13

Claims

1. This is an oil-in-water cosmetic containing the following ingredients (A), (B), and (C): An oil-in-water cosmetic characterized in that, in 100% by mass of the oil-in-water cosmetic, the total content of component (A) and component (B) is 5 to 50% by mass, the mass ratio of component (A) to component (B) ((A):(B)) is 70:30 to 95:5, and the content of component (C) is 1 to 10% by mass. Component (A): At least one oil selected from the group consisting of hydrocarbon oils, ester oils, and silicone oils that is liquid at 25°C. Component (B): Ester wax EW, comprising a tetraester TE of a linear saturated fatty acid having 14 to 26 carbon atoms and pentaerythritol, and a partial ester PE of a linear saturated fatty acid having 14 to 26 carbon atoms and pentaerythritol, wherein the mass ratio (TE:PE) of the tetraester TE to the partial ester PE is 80:20 to 98:

2. Ingredient (C): Surfactant

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