Cosmetics

Abstract

To provide a cosmetic preparation having excellent sebum solidification effect.SOLUTION: A cosmetic preparation is used which includes hydrophobic zinc oxide and non-hydrophobic zinc oxide.SELECTED DRAWING: None

Description

[Technical Field]

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

[0002] Sebum secreted from the skin mixes with ingredients in makeup cosmetics, causing makeup to break down over time. When a large amount of sebum is secreted, the sebum floats to the surface of the face, causing sebum breakdown. As a countermeasure against sebum breakdown, it is known to incorporate powder containing zinc oxide, which solidifies sebum, to solidify the sebum and prevent sebum breakdown (for example, Patent Document 1).

[0003] The zinc oxide blended into the oil of cosmetics is often hydrophobized zinc oxide because it has excellent dispersibility.

[0004] Users are highly conscious of preventing sebum-induced breakdown, and there is a demand for the development of cosmetics that can further prevent sebum-induced breakdown. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2020-33274 Summary of the Invention

[0006] The present inventors have surprisingly found that a cosmetic comprising hydrophobic zinc oxide and non-hydrophobic zinc oxide can achieve a cosmetic that has an excellent sebum solidifying effect and can prevent makeup from coming off. The present invention is based on these findings.

[0007] Accordingly, the present invention discloses a cosmetic composition comprising hydrophobic zinc oxide and non-hydrophobic zinc oxide.

[0008] According to the present invention, the following inventions are provided. (1) A cosmetic comprising hydrophobic zinc oxide and non-hydrophobic zinc oxide. (2) The cosmetic according to (1), wherein the hydrophobic zinc oxide is zinc oxide whose surface has been treated with an alkylalkoxysilane. (3) A cosmetic according to (1) or (2), wherein the hydrophobic zinc oxide is zinc oxide whose surface has been treated with octyltriethoxysilane. (4) The cosmetic preparation according to any one of (1) to (3), wherein the hydrophobic zinc oxide has an average particle size of 20 to 60 nm. (5) The cosmetic according to any one of (1) to (4), wherein the average particle size of the hydrophobic zinc oxide is 30 to 55 nm. (6) The cosmetic preparation according to any one of (1) to (5), wherein the non-hydrophobic zinc oxide is a plate-like crystal. (7) The cosmetic preparation according to any one of (1) to (6), wherein the non-hydrophobic zinc oxide has an average aspect ratio of 4 or more. (8) The cosmetic according to any one of (1) to (7), wherein the blending amount of the non-hydrophobic zinc oxide is 1 to 80 mass % relative to the total amount of the non-hydrophobic zinc oxide and the hydrophobic zinc oxide. (9) The cosmetic preparation according to any one of (1) to (8), further comprising a dispersant. (10) The cosmetic according to any one of (1) to (9), which is a water-in-oil or oil-in-water emulsion cosmetic. (11) The cosmetic preparation according to (10), wherein the hydrophobic zinc oxide and the non-hydrophobic zinc oxide are present in an oil phase.

[0009] The cosmetic composition according to the present invention has an excellent sebum solidifying effect and can prevent makeup from coming off.

[0010] The present invention relates to a cosmetic preparation comprising hydrophobic zinc oxide and non-hydrophobic zinc oxide.

[0011] [Hydrophobic zinc oxide] The hydrophobic zinc oxide to be blended in the cosmetic composition according to the present invention is not particularly limited as long as it is a hydrophobic zinc oxide that is generally used in cosmetics. Hydrophobic zinc oxide is formed by subjecting the surface to hydrophobic treatment. By subjecting the surface to hydrophobic treatment, water resistance and dispersibility in oil are improved. As a method for hydrophobic treatment, the surface is preferably treated with alkylalkoxysilane. Examples of alkylalkoxysilane include octyltriethoxysilane and octyltrimethoxysilane, with octyltriethoxysilane treatment being preferred. The hydrophobic zinc oxide may be a combination of two or more types.

[0012] The average particle size of the hydrophobic zinc oxide is preferably 20 to 60 nm, more preferably 30 to 55 nm. Note that the average particle size in the present invention means 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.

[0013] The particle shape of the hydrophobic zinc oxide is not particularly limited, and the shape may be spherical, plate-like, crushed, or the like.

[0014] The blending amount of hydrophobic zinc oxide is preferably 1 to 50 mass %, more preferably 3 to 30 mass %, based on the total amount of the cosmetic of the present invention.

[0015] [Non-hydrophobic zinc oxide] The non-hydrophobic zinc oxide blended in the cosmetic composition according to the present invention refers to zinc oxide whose surface has not been subjected to a hydrophobic treatment, and is hydrophilic. Hydrophobic zinc oxide is generally used because of its good dispersibility in oil, but surprisingly, by combining non-hydrophobic zinc oxide with hydrophobic zinc oxide, the sebum solidifying effect is significantly improved compared to the case of hydrophobic zinc oxide alone. The amount of non-hydrophobic zinc oxide blended is preferably 1 to 80 mass %, more preferably 1 to 60 mass %, even more preferably 3 to 40 mass %, and still more preferably 10 to 30 mass %, based on the total amount of non-hydrophobic zinc oxide and hydrophobic zinc oxide.

[0016] The average particle size of the non-hydrophobic zinc oxide is not particularly limited, but is preferably 30 to 5000 nm, and more preferably 50 to 4000 nm. The particle shape of the non-hydrophobic zinc oxide is not particularly limited, but is preferably plate-like, more preferably hexagonal plate-like. The average aspect ratio of non-hydrophobic zinc oxide is not particularly limited, but is preferably 4 or more. In the present invention, the average aspect ratio represents (average particle diameter) / (average thickness). The average thickness can be determined, for example, from image analysis using a transmission electron microscope as the arithmetic mean of the thicknesses of 20 particles.

[0017] When the cosmetic according to the present invention is a water-in-oil or oil-in-water emulsion cosmetic, the non-hydrophobic zinc oxide and the hydrophobic zinc oxide are preferably present in the oil phase.

[0018] [Dispersant] The cosmetic preparation according to the present invention preferably further comprises a dispersant. The dispersant disperses the non-hydrophobic zinc oxide in the cosmetic preparation, preferably in the oil phase. Examples of dispersants include isostearic acid, bisbutyldimethicone polyglyceryl-3, and sorbitan sesquiisostearate. The blending amount of the dispersant is preferably 0.1 to 5 mass %, more preferably 0.3 to 3 mass %, relative to the total amount of the cosmetic.

[0019] [UV absorber] The cosmetic composition according to the present invention may contain an ultraviolet absorber, which may be at least one selected from ultraviolet absorbers that have conventionally been incorporated into sunscreen cosmetics.

[0020] Specific examples of UVA absorbers include methylene bisbenzotriazolyl tetramethylbutylphenol, t-butyl methoxydibenzoylmethane, diethylamino hydroxybenzoyl hexyl benzoate, 2-ethylhexyl dimethoxybenzylidene dioxoimidazolidine propionate, terephthalidenedicamphorsulfonic acid, and bisethylhexyloxyphenol methoxyphenyl triazine. Specific examples of UVB absorbers include ethylhexyl methoxycinnamate, ethylhexyl triazone, octocrylene, dimethicone diethyl benzalmalonate, polysilicone-15, oxybenzone-3, phenylbenzimidazole sulfonic acid, homosalate, drometrizole trisiloxane, and ethylhexyl salicylate.

[0021] [Surfactants] The cosmetic preparation according to the present invention may contain a surfactant, such as an anionic surfactant, a cationic surfactant, an amphoteric surfactant, or a nonionic surfactant.

[0022] [Metal salts] The cosmetic preparation according to the present invention may contain a metal salt selected from the group consisting of water-soluble aluminum compounds, water-soluble zirconium compounds, and zinc sulfonate compounds. Examples of the metal salt include aluminum chloride, aluminum sulfate, aluminum chlorohydrate, allantoin chlorohydrate aluminum, allantoin dihydroxyaluminum, bromohydroxyaluminum, aluminum acetate, aluminum lactate, aluminum zirconium chlorohydrate, zirconium chlorohydrate, aluminum potassium sulfate, and zinc paraphenolsulfonate, more preferably aluminum chlorohydrate or zinc paraphenolsulfonate, and more preferably aluminum chlorohydrate or zinc paraphenolsulfonate.

[0023] [Pigment] The cosmetic composition according to the present invention may contain a pigment. Examples of the pigment include inorganic white pigments, inorganic red pigments, inorganic brown pigments, inorganic yellow pigments, inorganic black pigments, inorganic purple pigments, inorganic green pigments, inorganic blue pigments, pearl pigments, metal powder pigments, organic pigments, and natural colorants. Specific examples include talc, mica, and sericite.

[0024] [Fine particle metal oxide] The cosmetic composition according to the present invention may contain fine particle oxides other than those mentioned above, such as fine particle iron oxide, fine particle titanium oxide, and cerium oxide.

[0025] [Other powders] The cosmetic composition according to the present invention may contain powders other than pigments and finely divided metal oxides, such as silica, starch powder, and cellulose powder. The blending amount of other powders is preferably 10% by mass or less, and more preferably 5% by mass or less, relative to the total amount of the cosmetic. In one aspect of the present invention, the cosmetic according to the present invention does not contain other powders (0% by mass).

[0026] Optional components other than those described above include components commonly used in cosmetics, such as moisturizers, antioxidants, preservatives, alcohols, oil phase thickeners, aqueous phase thickeners, oily components such as silicone oils and ester oils, whitening agents, and extracts.

[0027] The cosmetic according to the present invention may contain water, and the blending amount of water is preferably 20 to 80% by mass, more preferably 30 to 60% by mass, relative to the total amount of the cosmetic.

[0028] The cosmetic composition according to the present invention can be preferably used as, for example, a makeup cosmetic composition such as a makeup base or foundation, a base cosmetic composition, or a sunscreen cosmetic composition. The formulation of the cosmetic according to the present invention is not particularly limited, but is preferably a water-in-oil or oil-in-water emulsion cosmetic, more preferably a water-in-oil emulsion cosmetic.

[0029] The cosmetic of the present invention can be produced by a conventional method. When the cosmetic of the present invention is a water-in-oil or oil-in-water emulsion cosmetic, the emulsification method is not particularly limited. [Example]

[0030] The present invention will be described in detail based on the following examples, but the present invention is not limited to these examples. Unless otherwise specified, the contents are expressed in mass % relative to the total amount.

[0031] [Examples 1 to 13 and Comparative Examples 1 and 2] Cosmetics of Examples 1 to 13 and Comparative Examples 1 and 2 were prepared with the formulations shown in Table 1, and the sebum solidifying effect was evaluated. [Table 1] In the table, Hydrophobic zinc oxide A: "MZX-304OTS" (manufactured by Teika Corporation), octyltriethoxysilane treated, amorphous, average particle size 35 nm, Hydrophobic zinc oxide B: "XZ-300F-LP" (Sakai Chemical Industry Co., Ltd.), hydrogen dimethicone treated, hexagonal plate shape, average particle size 300 nm, average aspect ratio 3, Hydrophobic zinc oxide C: "XZ-1000F-LP" (Sakai Chemical Industry Co., Ltd.), hydrogen dimethicone treated, hexagonal plate shape, average particle size 1000 nm, average aspect ratio 3.4, Non-hydrophobic zinc oxide A: "XZ 1000FST" (Sakai Chemical Industry Co., Ltd.), hexagonal plate-shaped, average particle size 1000 nm, average aspect ratio 10 to 12.5, Non-hydrophobic zinc oxide B: irregular shape, average particle size 40nm, Non-hydrophobic zinc oxide C: irregular shape, average particle size 500nm, Non-hydrophobic zinc oxide D: irregular shape, average particle size 200nm, Non-hydrophobic zinc oxide E: "Candy Zinc" (manufactured by Sakai Chemical Industry Co., Ltd.), spherical scale aggregates, average particle diameter 1000 nm, Non-hydrophobic zinc oxide F: "XZ-100F" (Sakai Chemical Industry Co., Ltd.), hexagonal plate shape, average particle size 100 nm, Non-hydrophobic zinc oxide G: "XZ-300F" (Sakai Chemical Industry Co., Ltd.), hexagonal plate shape, average particle size 300 nm, Non-hydrophobic zinc oxide H: "XZ-1000F" (Sakai Chemical Industry Co., Ltd.), hexagonal plate shape, average particle size 1000 nm, Non-hydrophobic zinc oxide I: "MZ-200" (manufactured by Teika Corporation), irregular shape, average particle size 50 nm, Non-hydrophobic zinc oxide J: "MZ-500" (manufactured by Teika Corporation), irregular shape, average particle size 25 nm.

[0032] [Method for evaluating sebum solidification effect] The cosmetics of the Examples and Comparative Examples were applied to artificial leather ("Suprale", manufactured by Ideatex Japan Co., Ltd.) at a density of 1 mg / cm. 2 The gloss value at 60° was measured 15 minutes after application using a gloss meter "VG-2000" (manufactured by Nippon Denshoku Industries Co., Ltd.). 2 The amount of oleic acid was applied, and the gloss value was measured in the same manner 30 minutes after application of oleic acid. The artificial leather was left standing on a hot plate at 37°C until measurement 30 minutes after application of oleic acid. For each example and comparative example, the above measurement was performed three times, and the difference in gloss meter (gloss value after application of oleic acid - gloss value before application of oleic acid) was calculated using the average value of the three measurements. The results are shown in Table 1. When the same procedure was carried out as above except that no cosmetic material was applied to the artificial leather, the difference in gloss meter reading was 2.5.

[0033] The results in Table 1 show that cosmetics containing hydrophobic zinc oxide and non-hydrophobic zinc oxide have a high sebum solidifying effect.

Claims

1. comprising hydrophobic zinc oxide and non-hydrophobic zinc oxide; the hydrophobic zinc oxide and the non-hydrophobic zinc oxide are present in an oil phase; the blending amount of the non-hydrophobic zinc oxide is 3 to 40 mass % based on the total amount of the non-hydrophobic zinc oxide and the hydrophobic zinc oxide, It is a water-in-oil or oil-in-water emulsion cosmetic, Further comprising a dispersant, the dispersing agent is isostearic acid, bisbutyldimethicone polyglyceryl-3, or sorbitan sesquiisostearate; A cosmetic in which the blending amount of the dispersant is 0.1 to 5% by mass relative to the total amount of the cosmetic.

2. Comprising hydrophobic zinc oxide and non-hydrophobic zinc oxide, the hydrophobic zinc oxide and the non-hydrophobic zinc oxide are present in an oil phase; the blending amount of the non-hydrophobic zinc oxide is 3 to 40 mass % based on the total amount of the non-hydrophobic zinc oxide and the hydrophobic zinc oxide, It is a water-in-oil or oil-in-water emulsion cosmetic, A cosmetic preparation, wherein the hydrophobic zinc oxide is zinc oxide that has been surface-treated with an alkylalkoxysilane.

3. 3. The cosmetic preparation according to claim 1, wherein the hydrophobic zinc oxide is zinc oxide whose surface has been treated with octyltriethoxysilane.

4. The cosmetic preparation according to any one of claims 1 to 3, wherein the hydrophobic zinc oxide has an average particle size of 20 to 60 nm.

5. The cosmetic preparation according to any one of claims 1 to 4, wherein the hydrophobic zinc oxide has an average particle size of 30 to 55 nm.

6. The cosmetic preparation according to any one of claims 1 to 5, wherein the non-hydrophobic zinc oxide is in the form of a platelet crystal.

7. The cosmetic preparation according to any one of claims 1 to 6, wherein the non-hydrophobic zinc oxide has an average aspect ratio of 4 or more.

8. The cosmetic preparation according to claim 2, further comprising a dispersant.

Images