Cosmetics

Abstract

To provide a cosmetic having excellent sebum solidifying effect and excellent freshness.SOLUTION: A cosmetic includes dextrin fatty acid-treated zinc oxide, a hydrocarbon-based nonionic surfactant with an HLB of 10 or more, and water, the dextrin fatty acid-treated zinc oxide being dispersed in an aqueous phase.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a cosmetic preparation comprising zinc oxide. [Background technology]

[0002] Excessive sebum secretion causes shine and stickiness. Furthermore, mixing of the excess sebum with makeup cosmetic ingredients can cause makeup to break down over time. To prevent these problems, it is known to incorporate zinc oxide or the like to solidify sebum and suppress shine and sebum breakdown. For this purpose, zinc oxide is generally incorporated into a powder or is incorporated into an oil phase in a hydrophobic state. Under these circumstances, there is a demand for cosmetics that have a high sebum solidification effect and also have a refreshing feel.

[0003] Zinc oxide is also known as a sunscreen. Patent Document 1 proposes that zinc oxide can be stably incorporated into an aqueous phase by combining an inorganic powder such as zinc oxide with a specific surfactant having an HLB of 9.5 or less. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-74660 A Summary of the Invention

[0005] Dextrin fatty acid-treated zinc oxide is known to have a sebum solidifying effect, but it has been found that when it is added to an aqueous phase, it causes aggregation. The present inventors have surprisingly found that by combining dextrin fatty acid-treated zinc oxide with a hydrocarbon nonionic surfactant having an HLB of 10 or more and dispersing zinc oxide in an aqueous phase, it is possible to obtain a cosmetic composition having a high sebum solidification effect and a good moisturizing feeling. The present invention is based on these findings.

[0006] According to the present invention, the following inventions are provided. (1) A cosmetic comprising (A) dextrin fatty acid-treated zinc oxide, (B) a hydrocarbon-based nonionic surfactant having an HLB of 10 or more, and (C) water, (A) A cosmetic preparation in which dextrin fatty acid-treated zinc oxide is dispersed in an aqueous phase. (2) (B) The cosmetic according to (1), wherein the hydrocarbon-based nonionic surfactant having an HLB of 10 or more is selected from the group consisting of polyglycerin fatty acid esters, fatty acid polyoxyethylene glyceryl esters, sorbitan fatty acid esters, and polyoxyethylene alkyl ethers. (3) A cosmetic according to (1) or (2), in which (A) the dextrin fatty acid-treated zinc oxide is dextrin palmitate-treated zinc oxide. (4) The cosmetic preparation according to any one of (1) to (3), further comprising (D) an anionic surfactant. (5) The cosmetic according to any one of (1) to (4), wherein the blending amount of (A) dextrin fatty acid-treated zinc oxide is 1 to 20 mass % relative to the total amount of the cosmetic. (6) A cosmetic according to any one of (1) to (5), in which the blending amount of (B) the hydrocarbon-based nonionic surfactant with an HLB of 10 or more is 0.1 to 5 mass % relative to the total amount of the cosmetic. (7) A cosmetic preparation according to any one of (1) to (6), in which the mass ratio of (A) dextrin fatty acid-treated zinc oxide to (B) a hydrocarbon-based nonionic surfactant having an HLB of 10 or higher is 1:0.05 to 1:0.3. (8) The cosmetic according to (4), wherein the blending amount of (D) anionic surfactant is 0.05 to 2% by mass relative to the total amount of the cosmetic. (9) The cosmetic according to any one of (1) to (8), which is an oil-in-water cosmetic.

[0007] The cosmetic composition according to the present invention has an excellent sebum solidification effect, can effectively suppress shine and makeup smearing, and can also achieve a good feeling of freshness.

[0008] The present invention relates to a cosmetic preparation comprising (A) dextrin-treated zinc oxide with a fatty acid, (B) a hydrocarbon-based nonionic surfactant having an HLB of 10 or more, and (C) water, in which (A) dextrin-treated zinc oxide with a fatty acid is dispersed in the aqueous phase (hereinafter, this may be referred to as the cosmetic preparation).

[0009] (A) Dextrin fatty acid treated zinc oxide The cosmetic preparation according to the present invention comprises dextrin fatty acid-treated zinc oxide (hereinafter sometimes referred to as component (A), and the same applies to other components). One of the characteristics of the present invention is that component (A) is dispersed in an aqueous phase.

[0010] Component (A) is formed by treating the surface of zinc oxide with dextrin and fatty acid. By treating the surface with dextrin and fatty acid, the sebum solidifying effect is significantly improved. The fatty acid of the dextrin and fatty acid-treated zinc oxide is preferably a fatty acid having 12 to 18 carbon atoms. Component (A) is more preferably zinc oxide treated with dextrin palmitate. The treatment method is not particularly limited, but for example, zinc oxide treated with dextrin and fatty acid can be produced by mixing and stirring zinc oxide in fatty acid dextrin for a certain period of time and then filtering the mixture.

[0011] The average particle size of component (A) is not particularly limited, but is preferably 1 to 5,000 nm. Note that the average particle size in the present invention refers to the average primary particle size, and can be determined, for example, from image analysis using a transmission electron microscope as the arithmetic mean of the major and minor axes of the particles. There are no particular limitations on the particle shape of component (A), and it may be spherical, plate-like, crushed, or the like.

[0012] The blending amount of dextrin-fatty acid-treated zinc oxide is preferably 1 to 20 mass %, more preferably 2 to 10 mass %, relative to the total amount of the cosmetic.

[0013] (B) Hydrocarbon-based nonionic surfactants with an HLB of 10 or higher The cosmetic composition according to the present invention comprises a hydrocarbon-based nonionic surfactant having an HLB of 10 or more. The HLB of component (B) is 10 or more, preferably 11 to 19, and more preferably 12 to 18. In the present invention, the HLB (Hydrophile-Lipophile Balance) of component (B) can be determined by the Griffin method.

[0014] Since it tends to be difficult to stably incorporate component (A) into an aqueous phase, it has conventionally been incorporated into an oil phase. The present inventors have surprisingly discovered that by combining component (A) and component (B), component (A) can be stably incorporated into an aqueous phase. In order to fully exert these effects, it is preferable from the viewpoint of dispersion uniformity and dispersion stability to prepare the cosmetic of the present invention by first dispersing component (A), component (B), and, if desired, component (D), which will be described later, in water to produce a dispersion, and then combining this dispersion with optional components to prepare the cosmetic.

[0015] Component (B) is preferably selected from the group consisting of polyglycerin fatty acid esters, fatty acid polyoxyethylene glyceryl, sorbitan fatty acid esters, and polyoxyethylene alkyl ethers.

[0016] Examples of polyglycerol fatty acid esters include polyglyceryl-10 isostearate, polyglyceryl-10 oleate, polyglyceryl-6 oleate, polyglyceryl-6 caprylate, polyglyceryl-10 diisostearate, polyglyceryl-10 dioleate, polyglyceryl-6 dicaprate, polyglyceryl-10 distearate, polyglyceryl-10 stearate, polyglyceryl-10 myristate, polyglyceryl-4 laurate, polyglyceryl-6 laurate, and polyglyceryl-10 laurate.

[0017] Examples of fatty acid polyoxyethylene glyceryl include PEG-10 glyceryl stearate, PEG-15 glyceryl stearate, PEG-20 glyceryl stearate, PEG-30 glyceryl stearate, PEG-40 glyceryl stearate, PEG-8 glyceryl isostearate, PEG-10 glyceryl isostearate, PEG-15 glyceryl isostearate, PEG-20 glyceryl isostearate, PEG-25 glyceryl isostearate, PEG-30 glyceryl isostearate, PEG-40 glyceryl isostearate, and PEG-50 glyceryl isostearate. PEG-60 glyceryl isostearate, PEG-20 glyceryl diisostearate, PEG-30 glyceryl diisostearate, PEG-60 glyceryl diisostearate, PEG-30 glyceryl trioleate, PEG-40 glyceryl trioleate, PEG-50 glyceryl trioleate, PEG-60 glyceryl trioleate, PEG-30 glyceryl triisostearate, PEG-40 glyceryl triisostearate, PEG-50 glyceryl triisostearate, PEG-60 glyceryl triisostearate, PEG-9 glyceryl laurate, and the like.

[0018] Examples of sorbitan fatty acid esters include coconut fatty acid sorbitan, monococonut fatty acid POE(20) sorbitan, and monostearate POE(20) sorbitan.

[0019] Examples of polyoxyethylene alkyl ethers include ceteth-7, ceteth-10, ceteth-12, ceteth-15, ceteth-17, ceteth-20, ceteth-25, ceteth-30, steareth-10, steareth-11, steareth-12, steareth-15, steareth-20, steareth-25, steareth-30, steareth-40, laureth-5, laureth-7, laureth-9, laureth-10, laureth-12, laureth-15, laureth-20, laureth-25, laureth-30, laureth-50, and beheneth-20. Examples of such phytosterols include beheneth-30, PEG-10 phytosterol, PEG-20 phytosterol, PEG-25 phytosterol, PEG-30 phytosterol, cholestrol-10, cholestrol-15, cholestrol-20, cholestrol-24, cholestrol-30, isoceteth-10, isoceteth-15, isoceteth-20, isoceteth-25, isosteareth-10, isosteareth-15, isosteareth-20, isosteareth-25, octyldodeceth-10, octyldodeceth-16, octyldodeceth-20, and octyldodeceth-25.

[0020] Component (B) is more preferably selected from the group consisting of fatty acid polyoxyethylene glyceryl and polyoxyethylene alkyl ether, and among these, those having an average number of moles of ethylene oxide added of 5 to 80 are more preferred, and those having an average number of moles of ethylene oxide added of 10 to 60 are even more preferred.

[0021] The blending amount of component (B) is preferably 0.1 to 5 mass %, more preferably 0.2 to 2 mass %, relative to the total amount of the cosmetic.

[0022] The mass ratio of the component (A) to the component (B) (component (A):component (B)) is preferably 1:0.05 to 1:0.3, and more preferably 1:0.075 to 1:0.25.

[0023] (C)Water The cosmetic preparation according to the present invention contains water. As the water, water used in cosmetics, quasi-drugs, etc., such as purified water, ion-exchanged water, tap water, etc., can be used. The blending amount of water is preferably 40 to 90 mass %, more preferably 50 to 80 mass %, based on the total amount of the cosmetic according to the present invention.

[0024] (D) Anionic surfactants The cosmetic composition according to the present invention preferably further comprises an anionic surfactant. By combining component (D) with components (A) and (B), component (A) can be more stably dispersed in the aqueous phase.

[0025] Examples of component (D) include fatty acid soaps (examples include laurates, myristates, palmitates, etc., and salts include sodium and potassium), long-chain acyl sulfonates, N-acyl glutamates, carboxylate types such as alkyl ether acetates and sodium lauryl glycol acetate, sulfonic acid types such as α-olefin sulfonates, alkanesulfonates, and alkylbenzene sulfonates, sulfate ester salts such as higher alcohol sulfates, and phosphate ester salts, with N-acyl glutamates being preferred.

[0026] The blend amount of component (D) is preferably 0.05 to 2 mass %, more preferably 0.05 to 1 mass %, and even more preferably 0.1 to 1 mass %, relative to the total amount of the cosmetic.

[0027] The cosmetic preparation according to the present invention may contain other ingredients commonly used in cosmetics, as long as the ingredients do not impair the effects of the present invention. These ingredients include, for example, moisturizers, alcohols, oils, thickeners, pharmaceuticals (e.g., arbutin, ascorbic acid glucoside, tranexamic acid, 4-methoxysalicylate, etc.), UV absorbers, chelating agents, pH adjusters, preservatives, pigments, dyes, surfactants other than those mentioned above, powder components, etc.

[0028] The cosmetic composition according to the present invention may be in any form, but is preferably an oil-in-water emulsion cosmetic composition. Specific uses include skin care cosmetics such as lotions, gels, emulsions, creams, and packs, makeup cosmetics such as makeup bases and foundations, base cosmetics, and sunscreen cosmetics.

[0029] The cosmetic of the present invention can be produced by a conventional method. When the cosmetic of the present invention is an oil-in-water emulsion cosmetic, the production method is not particularly limited. When the cosmetic according to the present invention is an oil-in-water emulsion cosmetic, the method for producing the cosmetic according to the present invention includes the steps of: forming a dispersion of components (A), (B), and optionally (D) in water; and Mixing the dispersion with an emulsion containing other necessary ingredients. This emulsion can contain the above-mentioned ingredients that are usually used in cosmetics. [Example]

[0030] The present invention will be specifically described based on the following examples, but the present invention is not limited to these examples.

[0031] [Examples 1 to 5 and Comparative Examples 1 to 4] Cosmetics of Examples 1 to 5 and Comparative Examples 1 to 4 were prepared according to the formulations shown in Table 1. In the table, the numerical values ​​for the compositions indicate the amounts (g) of the components. [Table 1] In the table, Zinc oxide treated with dextrin palmitate: "WSX-MZ-500" (Teika Co., Ltd.), Triethoxycaprylylsilane-treated zinc oxide: "OTS FZO 50" (Daito Chemical Industry Co., Ltd.).

[0032] [Dispersibility] The cosmetic compositions prepared above were visually observed, and the dispersion state of zinc oxide was evaluated according to the following criteria. A: It was uniformly dispersed. B: Some aggregation was observed. C: Aggregation was observed in most areas.

[0033] [Sebum solidification effect] 2 g of the cosmetic material prepared above was placed in a 50 ml vial, and 5 g of oleic acid was added thereto and stirred to mix uniformly. The mixture was then allowed to stand, and the state of the mixture was observed and evaluated according to the following criteria. A: The mixture solidified within 10 minutes of standing (it did not flow even when the vial was tilted). B: The mixture solidified after being left to stand for 10 minutes or more and less than 120 minutes. C: The mixture was left standing for 120 minutes and still retained fluidity without solidifying.

[0034] [Stability] The state of the cosmetic material prepared above immediately after preparation was visually observed, and the stability of the cosmetic material was evaluated according to the following criteria. A: The entire cosmetic was in a uniform state. B: Some aggregation was observed. C: Aggregation was observed in most areas.

[0035] Tables 2 to 4 show Examples 11 to 13, which are oil-in-water cosmetics according to the present invention. The values ​​in Tables 2 to 4 indicate mass %. These cosmetics had excellent dispersibility and stability, and also had excellent sebum-suppressing effects. These were produced by mixing an aqueous dispersion containing zinc oxide treated with dextrin palmitate, PEG-30 phytosterol, and sodium stearoyl glutamate with an emulsion containing other ingredients. [Table 2] [Table 3] [Table 4]

Claims

1. (A) dextrin fatty acid-treated zinc oxide, (B) a hydrocarbon-based nonionic surfactant with an HLB of 10 or more, and (C) Water A cosmetic comprising: (A) Dextrin fatty acid-treated zinc oxide is dispersed in an aqueous phase, (A) The blending amount of dextrin fatty acid-treated zinc oxide is 1 to 20 mass% relative to the total amount of the cosmetic, and A cosmetic preparation, comprising (A) dextrin fatty acid-treated zinc oxide and (B) a hydrocarbon-based nonionic surfactant having an HLB of 10 or more, in a mass ratio of 1:0.05 to 1:0.

3.

2. 2. The cosmetic preparation according to claim 1, wherein (B) the hydrocarbon-based nonionic surfactant having an HLB of 10 or more is selected from the group consisting of polyglycerin fatty acid esters, fatty acid polyoxyethylene glyceryl esters, sorbitan fatty acid esters, and polyoxyethylene alkyl ethers.

3. 3. The cosmetic preparation according to claim 1, wherein the dextrin fatty acid-treated zinc oxide (A) is dextrin palmitate-treated zinc oxide.

4. The cosmetic preparation according to any one of claims 1 to 3, further comprising (D) an anionic surfactant.

5. The cosmetic according to any one of claims 1 to 4, wherein the blending amount of (B) the hydrocarbon-based nonionic surfactant having an HLB of 10 or more is 0.1 to 5 mass% relative to the total amount of the cosmetic.

6. The cosmetic according to claim 4, wherein the blending amount of (D) the anionic surfactant is 0.05 to 2 mass % relative to the total amount of the cosmetic.

7. The cosmetic according to any one of claims 1 to 6, which is an oil-in-water cosmetic.

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