Water-in-oil emulsified cosmetic

Abstract

To provide a water-in-oil emulsified cosmetic having a rich feeling and providing firmness to the skin upon application.SOLUTION: The water-in-oil emulsified cosmetic of the present invention is characterized by comprising the following components (A) to (E): Component (A): hydrogenated castor oil hydroxystearate, Component (B): petrolatum, Component (C): water-soluble polymer, Component (D): oily component liquid at 25°C and Component (E): water.SELECTED DRAWING: None

Description

[Technical Field]

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

[0002] Skin cosmetics that impart a moisturizing feeling and firmness to the skin (a feeling that the skin is moderately taut and not loose) have been known for some time now, with the aim of making wrinkles less noticeable, etc. Known emulsion cosmetics that impart a firming feeling to the skin include those that contain polyethylene glycol (PEG) or higher alcohols (Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-197253 [Patent Document 2] Japanese Patent Application Laid-Open No. 2005-53879 Summary of the Invention [Problem to be solved by the invention]

[0004] However, skin care products containing PEG tend to run off the skin, making it difficult to provide sufficient firmness to the skin. Also, skin care products containing higher alcohols penetrate the skin and improve skin quality, but do not provide a sufficiently high firmness immediately after application.

[0005] Furthermore, skin cosmetics such as those described above are required to have a certain degree of weight when applied and a texture that gives the feeling of a high concentration (a "rich" texture, also known as "fullness"). The richness felt when applying cosmetics to the skin gives the user the feeling of using a rich agent, a sense of luxury, and anticipation of further effects, and these combined can increase satisfaction and enhance purchasing desire.

[0006] Therefore, an object of the present invention is to provide a cosmetic that has a rich texture and can impart firmness to the skin when applied to the skin. [Means for solving the problem]

[0007] As a result of extensive efforts to solve the above problems, the present inventors have discovered that an oil-in-water emulsion cosmetic obtained by using a combination of specific components (A) and (B) and further using components (C) to (E) has a rich texture and can impart firmness to the skin when applied to the skin. The present invention was completed based on these findings.

[0008] That is, the present invention provides an oil-in-water emulsion cosmetic containing the following component (A), component (B), component (C), component (D), and component (E): Ingredient (A): Hydrogenated castor oil hydroxystearic acid Ingredient (B): Vaseline Component (C): Water-soluble polymer Ingredient (D): An oily ingredient that is liquid at 25°C Ingredient (E): Water

[0009] The oil-in-water emulsion cosmetic preferably contains 0.3 to 1.5% by mass of component (A), 0.3 to 1.5% by mass of component (B), 0.2 to 2.0% by mass of component (C), and 1.0 to 10.0% by mass of component (D).

[0010] The oil-in-water emulsion cosmetic preferably contains the following component (F): By containing the following component (F), the cosmetic can be preferably used for wrinkle improvement and whitening. Ingredient (F): Niacinamide [Effects of the Invention]

[0011] The oil-in-water emulsion cosmetic of the present invention has a rich texture and can impart firmness to the skin when applied to the skin. DETAILED DESCRIPTION OF THE INVENTION

[0012] Unless otherwise specified in this specification, "X to Y" representing a numerical range means "at least X and at most Y." Furthermore, unless otherwise specified in this specification, the mass % representing the content ratio of a component is a value where the mass of the entire oil-in-water emulsion cosmetic is 100 mass %.

[0013] In this specification, "solid" at 25°C means a solid or semi-solid (paste-like) state at 25°C, and is not a "liquid" state. Furthermore, "liquid" at 25°C means that when 50 g of a sample is placed in a glass bottle with a radius of 2 cm and a height of 7 cm, and the glass bottle is inverted at 25°C, the sample drips from the glass bottle within 5 minutes of being inverted.

[0014] [Oil-in-water emulsion cosmetics] The oil-in-water emulsion cosmetic of the present invention contains at least hydrogenated castor oil hydroxystearate, petrolatum, a water-soluble polymer, an oily component that is liquid at 25° C., and water. Hereinafter, the above oil-in-water emulsion cosmetic may be referred to as the "oil-in-water emulsion cosmetic of the present invention."

[0015] In this specification, the above-mentioned "hydrogenated castor oil hydroxystearate" may be referred to as "component (A)," the above-mentioned "petrolatum" as "component (B)," the above-mentioned "water-soluble polymer" as "component (C)," the above-mentioned "oil-based component that is liquid at 25°C" as "component (D)," and the above-mentioned "water" as "component (E)." In other words, the oil-in-water emulsion cosmetic of the present invention contains at least component (A), component (B), component (C), component (D), and component (E).

[0016] The oil-in-water emulsion cosmetic of the present invention preferably contains niacinamide. Furthermore, the oil-in-water emulsion cosmetic of the present invention may contain an oily component that is solid at 25°C other than components (A) and (B), may contain a nonionic surfactant, and may contain a polyhydric alcohol. In this specification, the above-mentioned "niacinamide" may be referred to as "component (F)," the above-mentioned "oily component that is solid at 25°C other than components (A) and (B)" may be referred to as "component (G)," the above-mentioned "nonionic surfactant" may be referred to as "component (H)," and the above-mentioned "polyhydric alcohol" may be referred to as "component (I)." In other words, the oil-in-water emulsion cosmetic may contain components (F), (G), (H), and (I), and may contain components other than components (A) and (I).

[0017] <Component (A)> Component (A) is hydrogenated castor oil hydroxystearate. Component (A) is a highly polar ester oil that is solid at 25°C. It has the effect of imparting a rich feeling to the cosmetic when applied, and can also impart a firming effect by forming a film on the skin. Furthermore, when used in combination with component (B), it is possible to achieve both an excellent firming feeling and a rich feeling. Only one type of component (A) may be used, or two or more types may be used.

[0018] The hydrogenated castor oil contained in component (A) is not particularly limited, but may be obtained, for example, by hydrogenating castor oil extracted from castor bean seeds.

[0019] Commercially available products can be used as component (A), such as "Technol MH" (manufactured by Yokoseki Yushi Kogyo Co., Ltd.).

[0020] The content of component (A) in the total amount (100% by mass) of the oil-in-water emulsion cosmetic of the present invention is preferably 0.3 to 1.5% by mass, more preferably 0.5 to 1.0% by mass. When the content is 0.3% by mass or more, the cosmetic can be imparted with a more sufficient rich feeling upon application. Furthermore, when the content is 1.5% by mass or less, stickiness can be further suppressed, resulting in a good feeling of penetration into the skin.

[0021] <Ingredient (B)> Component (B) is petrolatum. Component (B) can impart a rich feeling to the oil-in-water emulsion cosmetic, and when used in combination with component (A), it can achieve both an excellent firmness and a rich feeling. Only one type of component (B) may be used, or two or more types may be used.

[0022] Component (B) is a mixture of hydrocarbons with a melting point of 38 to 60° C., and is solid at 25° C. Specific examples of component (B) include white petrolatum and yellow petrolatum.

[0023] The content of component (B) in the total amount (100% by mass) of the oil-in-water emulsion cosmetic of the present invention is preferably 0.3 to 1.5% by mass, more preferably 0.5 to 1.0% by mass. When the content is 0.3% by mass or more, the cosmetic can be imparted with a more sufficient rich feeling upon application. Furthermore, when the content is 1.5% by mass or less, stickiness can be further suppressed.

[0024] <Ingredient (C)> Component (C) is a water-soluble polymer. Component (C) thickens the cosmetic preparation, giving it a gel, cream, or gel-cream formulation. Because the oil-in-water emulsion cosmetic preparation of the present invention contains component (C), it can suppress dripping and is excellent in usability. Furthermore, when applied to the skin, it can be selectively applied to desired areas to impart a firming feeling. Furthermore, as component (C), only one type may be used, or two or more types may be used.

[0025] Component (C) is preferably a water-soluble acrylic polymer. Examples of the water-soluble acrylic polymer include, but are not limited to, carboxyvinyl polymer, alkyl-modified carboxyvinyl polymer, alkyl acrylate copolymer, (acrylates / steareth-20 methacrylate) copolymer, (acrylates / steareth-20 methacrylate) crosspolymer, (acrylates / beheneth-25 methacrylate) copolymer, (acrylates / vinyl neodecanoate) crosspolymer, (sodium acrylate / sodium acryloyldimethyltaurate) copolymer, and (hydroxyethyl acrylate / sodium acryloyldimethyltaurate) copolymer.

[0026] In particular, component (C) preferably contains the following component (C1) and / or component (C2), from the viewpoint of being able to give the cosmetic a fresh, gel-like formulation and an excellent feeling of penetration. Furthermore, from the viewpoint of further improving the feeling of richness, it is more preferable to contain component (C1) and component (C2). Component (C1): A polymer containing a structural unit derived from acryloyldimethyltaurate Component (C2): At least one polymer selected from the group consisting of a polymer containing at least a structural unit derived from (meth)acrylic acid and / or a (meth)acrylic acid alkyl ester and a structural unit derived from a (meth)acrylic acid polyoxyethylene alkyl ether (hereinafter, sometimes referred to as "polymer (C2-1)"), a carboxyvinyl polymer (hereinafter, sometimes referred to as "polymer (C2-2)"), and an alkyl-modified carboxyvinyl polymer (hereinafter, sometimes referred to as "polymer (C2-3)").

[0027] Component (C1) is a polymer containing at least a structural unit derived from an acryloyldimethyltaurate, such as sodium acryloyldimethyltaurate.

[0028] Component (C1) may contain a structural unit derived from a monomer component other than acryloyldimethyltaurate. Examples of the monomer component other than acryloyldimethyltaurate include (meth)acrylic acid such as acrylic acid, (meth)acrylates such as sodium acrylate, hydroxyl group-containing acrylic monomers such as hydroxyethyl acrylate, and amide group-containing acrylic monomers such as acrylic acid amide.

[0029] Examples of the component (C1) include a copolymer of acrylic acid and acryloyldimethyl taurate, a copolymer of hydroxyethyl acrylate and acryloyldimethyl taurate, and a copolymer of acrylic acid, an acrylate, an acrylamide and acryloyldimethyl taurate.

[0030] As component (C1), compounds having the INCI name "Sodium Acrylate / Sodium Acryloyldimethyl Taurate Copolymer" and compounds having the INCI name "Hydroxyethyl Acrylate / Sodium Acryloyldimethyl Taurate Copolymer" are preferred. Of the above, (Sodium Acrylate / Sodium Acryloyldimethyl Taurate) Copolymer is preferred.

[0031] As the component (C1), commercially available products can be used, such as those under the trade names "SIMULGEL EG" and "SIMULGEL NS" (both manufactured by SEPPIC SA).

[0032] The polymer (C2-1) is a polymer containing at least a structural unit derived from (meth)acrylic acid and / or a (meth)acrylic acid alkyl ester (monomer component (C2a)) and a structural unit derived from a (meth)acrylic acid polyoxyethylene alkyl ether (monomer component (C2b)).

[0033] Examples of the monomer component (C2b) include polyoxyethylene stearyl ether methacrylate and polyoxyethylene behenyl ether methacrylate. The average number of moles of oxyethylene added in the monomer component (C2b) is preferably 15 to 30. Only one type of the monomer component (C2a) and one type of the monomer component (C2b) may be used, or two or more types may be used. The component (C2) may contain structural units derived from monomer components other than the monomer component (C2a) and the monomer component (C2b).

[0034] Examples of the polymer (C2-1) include copolymers of (meth)acrylic acid and / or (meth)acrylic acid alkyl esters with polyoxyethylene stearyl ether methacrylate, and copolymers of (meth)acrylic acid and / or (meth)acrylic acid alkyl esters with polyoxyethylene behenyl ether methacrylate.

[0035] Preferred examples of polymer (C2-1) include compounds represented by the INCI names "ACRYLATES / STEARETH-20 METHACRYLATE COPOLYMER," "ACRYLATES / STEARETH-20 METHACRYLATE CROSSPOLYMER," and "ACRYLATES / BEHENETH-25 METHACRYLATE COPOLYMER." Of the above, acrylates / steareth-20 methacrylate copolymer and acrylates / beheneth-25 methacrylate copolymer are preferred from the viewpoint of cosmetic stability.

[0036] As the polymer (C2-1), commercially available products can be used, such as those under the trade names "Accurin 22," "Accurin 88," and "Accurin 28" (all manufactured by Dow-Toray Industries, Inc.).

[0037] The polymer (C2-2) is a water-soluble vinyl polymer mainly composed of acrylic acid or methacrylic acid having a carboxyl group. The polymer (C2-2) is designated, for example, by the INCI name "Carbomer."

[0038] As the polymer (C2-2), commercially available products can be used, such as those under the trade names "Carbopol 940," "Carbopol 941," "Carbopol 934," "Carbopol 980," and "Carbopol 981" (all manufactured by The Lubrizol Corporation).

[0039] Polymer (C2-3) is a polymer in which at least a portion of the carboxyl groups of the carboxyvinyl polymer have been esterified (for example, esterified with an alkyl group having 10 to 30 carbon atoms). Polymer (C2-3) is expressed, for example, by the INCI name "Acrylates / C10-30 Alkyl Acrylate Crosspolymer."

[0040] The polymer (C2-3) may be a commercially available product, such as those sold under the trade names "Pemulen TR-1," "Pemulen TR-2," "Carbopol 1382," "Carbopol 1342," "Carbopol ETD2020," "Carbopol Ultrez20," and "Carbopol Ultrez21" (all manufactured by The Lubrizol Corporation).

[0041] Component (C2) is preferably neutralized with a basic substance or is used after being neutralized with a basic substance. Examples of basic substances in this case include alkanolamines such as triethanolamine and monoethanolamine; inorganic bases such as ammonia, sodium hydroxide, and potassium hydroxide; and basic amino acids such as arginine. The amount of basic substance added is an amount sufficient to neutralize component (C2), and may be adjusted appropriately depending on the types of component (C2) and the basic substance and the amount of component (C2) used.

[0042] The content of component (C) in the total amount (100% by mass) of the oil-in-water emulsion cosmetic of the present invention is preferably 0.2 to 2.0% by mass, more preferably 0.25 to 1.7% by mass, even more preferably 0.5 to 1.5% by mass, and particularly preferably 0.6 to 1.2% by mass. When the content is 0.2% by mass or more, the cosmetic is appropriately thickened, improving usability and the feeling of penetration tends to be improved. Furthermore, when the content is 2.0% by mass or less, stickiness after application is suppressed, resulting in a smooth feeling in use. Furthermore, the cosmetic tends to be excellent in the effect of imparting a feeling of firmness.

[0043] The total mass proportion of components (C1) and (C2) relative to the total mass proportion of component (C) (100 mass%) is preferably 95.0 mass% or more, and more preferably 100 mass%. Furthermore, the total mass proportion of components (C1) and (C2) relative to the total mass (100 mass%) of the oil-in-water emulsion cosmetic of the present invention is preferably 0.25 to 1.7 mass%, more preferably 0.5 to 1.5 mass%, and particularly preferably 0.6 to 1.2 mass%.

[0044] The content of component (C1) in the total amount (100% by mass) of the oil-in-water emulsion cosmetic of the present invention is, for example, preferably 0.15 to 1.2% by mass, and more preferably 0.2 to 1.0% by mass. When component (C1) is contained in the above range, the penetration feeling can be further improved and the richness can be further improved.

[0045] The content of component (C2) in the total amount (100% by mass) of the oil-in-water emulsion cosmetic of the present invention is, for example, preferably 0.05 to 1.0% by mass, and more preferably 0.1 to 0.6% by mass. When component (C2) is contained in the above range, the penetration feeling can be further improved.

[0046] <Ingredient (D)> Component (D) is an oily component that is liquid at 25°C. By including component (D), it is possible to dissolve components (A) and (B) and to impart a moisturizing effect when the oil-in-water emulsion cosmetic is applied. Only one type of component (D) may be used, or two or more types may be used.

[0047] Component (D) is not particularly limited, but examples thereof include hydrocarbon oils, vegetable oils, ester oils, higher fatty acids, dimethylpolysiloxanes, and the like that are liquid at 25°C.

[0048] Examples of the hydrocarbon oil that is liquid at 25°C include α-olefin oligomer, mineral oil, hydrogenated polyisobutene, isododecane, isohexadecane, light isoparaffin, light liquid isoparaffin, squalane, synthetic squalane, vegetable squalane, liquid paraffin, and liquid isoparaffin.

[0049] Examples of the vegetable oil that is liquid at 25°C include jojoba seed oil, olive oil, camellia oil, macadamia nut oil, avocado oil, argan oil, and rice germ oil.

[0050] Examples of the ester oils that are liquid at 25°C include ethyl oleate, isopropyl myristate, isopropyl palmitate, myristyl myristate, 2-ethylhexyl palmitate, oleyl oleate, octyldodecyl myristate, octyldodecyl oleate, ethyl isostearate, isopropyl isostearate, propylene glycol isostearate, cetyl 2-ethylhexanoate, cetostearyl 2-ethylhexanoate, tri-2-ethylhexanoate, and propylene glycol isostearate. Examples of suitable oleic acid surfactants include glyceryl phosphate, caprylic / capric triglyceride, glyceryl triisopalmitate, pentaerythritol tetra-2-ethylhexanoate, diisopropyl adipate, isocetyl octanoate, isostearyl octanoate, isocetyl isostearate, octyldodecyl isostearate, octyldodecyl dimethyloctanoate, isononyl isononanoate, pentaerythrityl tetraoctanoate, and pentaerythrityl tetraisostearate.

[0051] Examples of the higher fatty acids that are liquid at 25° C. (for example, fatty acids having 8 to 22 carbon atoms) include isostearic acid and oleic acid.

[0052] As the dimethylpolysiloxane that is liquid at 25°C, a commercially available product can be used. For example, a commercially available product such as "KF-96H-30,000cs" (kinematic viscosity at 25°C: 30,000mm 2 / s), product name "KF-96H-50,000cs" (kinematic viscosity at 25°C: 50,000mm 2 / s), product name "KF-96H-60,000cs" (kinematic viscosity at 25°C: 60,000mm 2 / s), product name "KF-96H-100,000cs" (kinematic viscosity at 25°C: 100,000mm 2 / s) (both manufactured by Shin-Etsu Chemical Co., Ltd.); product name "DOWSIL SH200 FLUID 30,000 cSt" (kinematic viscosity at 25°C: 30,000 mm 2 / s), "DOWSIL SH200 FLUID 60,000cSt" (kinematic viscosity at 25°C: 60,000mm 2 / s), "DOWSIL SH200 FLUID 100,000cSt" (kinematic viscosity at 25°C: 100,000mm 2 / s), product name "DOWSIL SH200C FLUID 1000cSt" (kinematic viscosity at 25°C: 1000mm 2 / s), product name "DOWSIL SH200C FLUID 350cSt" (Kinematic viscosity at 25℃: mm 2 / s), product name "DOWSIL SH200C FLUID 100cSt" (kinematic viscosity at 25°C: 100mm 2 / s) Product name "DOWSIL SH200C FLUID 3000cSt" (Kinematic viscosity at 25℃: 3000mm 2 / s), product name "DOWSIL SH200C FLUID 5000cSt" (Kinematic viscosity at 25℃: 5000mm 2 / s), "DOWSIL SH200 FLUID 10000cSt" (kinematic viscosity at 25°C: 10000mm 2 / s), "DOWSIL SH200 FLUID 12500cSt" (kinematic viscosity at 25°C: 12500mm 2 / s) (all manufactured by Dow Toray Industries, Inc.)

[0053] The content of component (D) in the total amount (100% by mass) of the oil-in-water emulsion cosmetic of the present invention is preferably 1.0 to 10.0% by mass, and more preferably 2.0 to 8.0% by mass. When the content is 1.0% by mass or more, components (A) and (B) are dissolved, making it easier to impart a moisturizing effect. Furthermore, when the content is 10.0% by mass or less, stickiness after application can be suppressed.

[0054] <Ingredient (E)> Component (E) is water. Water is a medium that forms the continuous phase of the oil-in-water emulsion cosmetic. There are no particular limitations on the water, but purified water is preferred.

[0055] The content of component (E) in the total amount (100% by mass) of the oil-in-water emulsion cosmetic is not particularly limited, but is preferably, for example, 60.0 to 90.0% by mass, and more preferably 70.0 to 85.0% by mass.

[0056] <Component (F)> Component (F) is niacinamide. Niacinamide is an amide compound of nicotinic acid (niacin). The inclusion of component (F) can provide wrinkle improvement and whitening effects. Component (F) can be extracted from natural products (e.g., rice bran) or synthesized by known methods. Specifically, those listed in the 18th edition of the Japanese Pharmacopoeia can be used. Component (F) may be used alone or in combination of two or more types.

[0057] The content of component (F) in the total amount (100% by mass) of the oil-in-water emulsion cosmetic is not particularly limited, but is preferably 0.05 to 10.0% by mass, and more preferably 0.1 to 8.0% by mass. When the content is 0.05% by mass or more, wrinkle improvement effects and whitening effects are more easily exhibited.

[0058] <Ingredients (G)> Component (G) is an oily component that is solid at 25°C other than components (A) and (B). By containing an oily component that is solid at 25°C other than components (A) and (B), the oil-in-water emulsion cosmetic can impart an appropriate resistance to the cosmetic. Only one type of component (G) may be used, or two or more types may be used.

[0059] Examples of component (G) include waxes, higher alcohols, hydrocarbon oils, higher fatty acids, and fatty acid triglycerides that are solid at 25°C.

[0060] Examples of the wax that is solid at 25°C include carnauba wax, candelilla wax, beeswax, rice bran wax, shellac wax, and spermaceti wax.

[0061] Examples of the higher alcohols that are solid at 25°C include lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, cetostearyl alcohol, isostearyl alcohol, 2-octyldodecanol, oleyl alcohol, arachidyl alcohol, behenyl alcohol, and batyl alcohol.

[0062] Examples of the hydrocarbon oil that is solid at 25°C include ceresin, paraffin, microcrystalline wax, polyethylene wax, and the like.

[0063] Examples of the higher fatty acids that are solid at 25° C. (for example, fatty acids having 8 to 22 carbon atoms) include lauric acid, myristic acid, palmitic acid, and stearic acid.

[0064] Examples of the fatty acid triglyceride that is solid at 25°C include glyceryl tristearate, glyceryl tribehenate, glyceryl trimyristate, and glyceryl tri(behenate / isostearate / eicosanedioate).

[0065] The content of component (G) in the total amount (100% by mass) of the oil-in-water emulsion cosmetic is not particularly limited, but is preferably 0.1 to 2.0% by mass, and more preferably 0.2 to 1.5% by mass. When the content is 0.1% by mass or more, it is possible to impart an appropriate resistance feeling upon application. When the content is 2.0% by mass or less, it is possible to suppress stickiness after application.

[0066] <Component (H)> Component (H) is a nonionic surfactant, an emulsifier for emulsifying water and oil. Component (H) is preferably a fatty acid ester-type nonionic surfactant, such as monoglycerin fatty acid ester, polyglycerin fatty acid ester, sorbitan fatty acid ester, polyoxyethylene fatty acid ester, polyoxyethylene glycerin fatty acid ester, or polyoxyethylene sorbitan fatty acid ester. Component (H) may be used alone or in combination of two or more.

[0067] Examples of the monoglycerin fatty acid esters include glyceryl monocaprylate, glyceryl monocaprate, glyceryl monolaurate, glyceryl monomyristate, glyceryl monopalmitate, glyceryl monostearate, glyceryl distearate, glyceryl monoisostearate, glyceryl diisostearate, glyceryl monohydroxystearate, glyceryl monooleate, glyceryl monobehenate, and glyceryl dibehenate.

[0068] Examples of the polyglycerol fatty acid esters include polyglycerol fatty acid monoesters such as diglyceryl monostearate, diglyceryl monooleate, diglyceryl monoisostearate, tetraglyceryl monostearate, tetraglyceryl monooleate, hexaglyceryl monolaurate, hexaglyceryl monomyristate, hexaglyceryl monostearate, hexaglyceryl monooleate, decaglyceryl monolaurate, decaglyceryl monomyristate, decaglyceryl monostearate, and decaglyceryl monooleate. Esters; polyglycerol fatty acid diesters such as diglyceryl dioleate, decaglyceryl distearate, and decaglyceryl diisostearate; polyglycerol fatty acid triesters such as tetraglyceryl tristearate, hexaglyceryl tristearate, decaglyceryl tristearate, and decaglyceryl trioleate; and polyglycerol fatty acid pentaesters such as tetraglyceryl pentastearate, tetraglyceryl pentaoleate, hexaglyceryl pentastearate, and hexaglyceryl pentaoleate.

[0069] The average degree of polymerization of the polyglycerol in the polyglycerol fatty acid ester is preferably 2 to 10 from the viewpoint of enhancing emulsion stability.

[0070] The fatty acid in the polyglycerol fatty acid ester is preferably a fatty acid having 8 to 24 carbon atoms, more preferably a fatty acid having 10 to 20 carbon atoms, and even more preferably a fatty acid having 12 to 18 carbon atoms, from the viewpoint of enhancing emulsion stability.

[0071] Examples of the sorbitan fatty acid esters include sorbitan monocaprate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan distearate, sorbitan sesquistearate, sorbitan tristearate, sorbitan trioleate, sorbitan monoisostearate, sorbitan sesquiisostearate, sorbitan monooleate, sorbitan sesquioleate, and sorbitan coconut oil fatty acid.

[0072] Examples of the polyoxyethylene fatty acid esters include polyethylene glycol monolaurate, polyethylene glycol monopalmitate, polyethylene glycol monostearate, polyethylene glycol monoisostearate, polyethylene glycol distearate, polyethylene glycol monooleate, and polyethylene glycol dioleate.

[0073] Examples of the polyoxyethylene glycerin fatty acid esters include polyoxyethylene (caprylic / capric) glyceryl, polyoxyethylene coconut oil fatty acid glycerin, polyoxyethylene glyceryl monooleate, polyoxyethylene glyceryl monomyristate, polyoxyethylene glyceryl monostearate, polyoxyethylene glyceryl monoisostearate, polyoxyethylene glyceryl triisostearate, etc. The number of moles of ethylene oxide added is not particularly limited, but is preferably 2 to 100, more preferably 4 to 90, from the viewpoint of enhancing emulsion stability.

[0074] Examples of the polyoxyethylene sorbitan fatty acid ester include polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan tristearate, polyoxyethylene sorbitan oleate, polyoxyethylene sorbitan trioleate, etc. The number of moles of ethylene oxide added is not particularly limited, but is preferably 5 to 50, more preferably 10 to 30, from the viewpoint of enhancing emulsion stability.

[0075] The content of component (H) in the total amount (100% by mass) of the oil-in-water emulsion cosmetic is preferably 0.5 to 3.0% by mass, more preferably 0.7 to 2.5% by mass, and even more preferably 1.0 to 2.0% by mass. When the content is 0.5% by mass or more, good emulsion stability is achieved. Furthermore, when the content is 3.0% by mass or less, stickiness after application is suppressed, resulting in a smooth feel when used.

[0076] <Component (I)> Component (I) is a polyhydric alcohol. The oil-in-water emulsion cosmetic may contain a polyhydric alcohol to improve the moisturizing effect and provide a firming feeling. Component (I) may be used alone or in combination of two or more types.

[0077] Examples of component (I) include glycols such as ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, isoprene glycol, 1,3-butylene glycol, 1,2-butanediol, 1,2-pentanediol, 1,2-hexanediol, 1,2-octanediol, and 1,2-decanediol; glycerins such as glycerin, diglycerin, and polyglycerin; and sugar alcohols such as xylitol, trehalose, maltitol, mannitol, sorbitol, erythritol, arabitol, ribitol, galactitol, glucitol, and erythritol.

[0078] The content of component (I) in the total amount (100% by mass) of the oil-in-water emulsion cosmetic is not particularly limited, but is preferably 0.1 to 30.0% by mass, more preferably 5.0 to 27.5% by mass, and particularly preferably 10.0 to 25.0% by mass. When the content is 0.1% by mass or more, the moisturizing effect is further improved and a firm feeling is easily achieved. Furthermore, when the content is 30.0% by mass or less, the stickiness suppression effect is excellent.

[0079] [Other ingredients] The oil-in-water emulsion cosmetic of the present invention may contain ethanol from the viewpoint of improving the dispersibility of each component and the feel of the cosmetic penetrating into the skin. The content of ethanol in the oil-in-water emulsion cosmetic of the present invention is not particularly limited, but is preferably 0.1 to 30.0 mass% of the total amount (100 mass%) of the oil-in-water emulsion cosmetic, for example, preferably 0.5 to 25.0 mass%, more preferably 1.0 to 10.0 mass%. A content of 0.1 mass% or more provides the effect of further improving the dispersibility of each component and the feel of the cosmetic penetrating into the skin. Furthermore, a content of 30.0 mass% or less provides an excellent effect of suppressing the destabilization of the cosmetic due to irritation or decreased viscosity.

[0080] The oil-in-water emulsion cosmetic of the present invention may contain other ingredients depending on the intended use, as long as the effects of the present invention are not impaired. Examples of other ingredients include those commonly used in cosmetics other than those mentioned above (e.g., scrubbing agents such as crystalline cellulose, cellulose particles, silica, and calcium carbonate; cooling agents such as menthol and menthyl glyceryl ether; moisturizing agents; preservatives and disinfectants such as parahydroxybenzoates and phenoxyethanol; whitening agents; fragrances; powders; and coloring materials). These ingredients may be used alone or in combination of two or more.

[0081] The method for producing the oil-in-water emulsion cosmetic of the present invention is not particularly limited, and the cosmetic can be produced, for example, by blending the above-mentioned components (A) to (E) and, if necessary, other components, and mixing them using a known, commonly used mixing device such as a disper mixer or a paddle mixer.

[0082] The form of the oil-in-water emulsion cosmetic is not particularly limited, but examples include cream, emulsion, gel, and the like.

[0083] The oil-in-water emulsion cosmetic can be filled into a container from which the cosmetic can be easily taken out, such as a dispenser container, a tube container, or a wide-mouth jar container, and then used.

[0084] The areas to which the oil-in-water emulsion cosmetic can be applied are not particularly limited, and examples include the face (forehead, eyes, corners of the eyes, cheeks, mouth, etc.), the body (arms, elbows, back of the hands, fingertips, feet, knees, heels, neck, armpits, back, etc.), etc.

[0085] The oil-in-water emulsion cosmetic can be used as a moisturizing cosmetic that provides a rich feeling during application and a firm feeling after application. Furthermore, because it has an excellent effect of making wrinkles less noticeable, it can also be used as a wrinkle-improving cosmetic that is applied to areas of the face or body where wrinkles are a concern. Furthermore, by including a whitening component such as component (F), it can also be used as a whitening cosmetic. [Example]

[0086] The present invention will be described in more detail below based on examples, but the present invention is not limited to these examples. Unless otherwise specified, the amounts listed in the tables are the amounts of each component (i.e., the amount of active ingredient in each raw material) and are expressed in "% by mass." Note that the amounts of the raw materials mixed below are shown as the amounts of the raw materials. Mixed material containing polyacrylate-13: Product name "SEPIPLUS 400", manufactured by SEPPIC SA Mixed raw materials containing (sodium acrylate / sodium acryloyldimethyltaurate) copolymer: Product name "SIMULGEL EG", manufactured by SEPPIC SA Mixed raw materials containing (hydroxyethyl acrylate / sodium acryloyldimethyltaurate) copolymer: Product name "SIMULGEL NS", manufactured by SEPPIC SA Mixed raw material containing glyceryl behenate and polyglyceryl-6 octastearate: Product name "TAISET-50", manufactured by Taiyo Kagaku Co., Ltd.

[0087] Examples 1 to 16, Comparative Examples 1 to 2 (Preparation of each sample) Each component was blended according to the formulation shown in Table 1, and oil-in-water emulsion cosmetics were prepared in a conventional manner, and subjected to the following evaluation tests.

[0088] (evaluation) Three expert evaluators evaluated the richness and firmness of the cream, and the results were determined by combining the evaluations of each evaluator.

[0089] <Richness during application> The cosmetics obtained in the Examples and Comparative Examples were applied to the inner part of the forearm and then rubbed back and forth over the applied area with the hand to blend in. After application, the "richness" was evaluated sensorily based on the feel of the skin up to three strokes, using the following evaluation criteria. The evaluation results are shown in Table 1. ○ (Good): When spreading on the skin, the weight is clearly felt and it feels highly concentrated. × (bad): When spreading on the skin, there is no feeling of weight or high concentration.

[0090] <Firmness after application> In the above evaluation, after the cosmetics obtained in the Examples and Comparative Examples felt familiar to the skin, the "firmness" of the applied area was evaluated based on the feel of the skin according to the following evaluation criteria. The evaluation results are shown in Table 1. ○ (Good): Firmness is clearly felt. × (bad): No firmness felt.

[0091] [Table 1]

[0092] Formulation examples (total amount 100% by mass) of the oil-in-water emulsion cosmetic of the present invention are shown below. [Table 2]

Claims

1. An oil-in-water emulsion cosmetic comprising the following components (A), (B), (C), (D), and (E): Component (A): Hydrogenated castor oil hydroxystearate Ingredient (B): Vaseline Component (C): Water-soluble polymer Component (D): an oily component that is liquid at 25°C Component (E): Water

2. 2. The oil-in-water emulsion cosmetic according to claim 1, wherein the content of component (A) is 0.3 to 1.5% by mass, the content of component (B) is 0.3 to 1.5% by mass, the content of component (C) is 0.2 to 2.0% by mass, and the content of component (D) is 1.0 to 10.0% by mass.

3. 3. The oil-in-water emulsion cosmetic according to claim 1, further comprising the following component (F): Ingredient (F): Niacinamide

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