Powdered cosmetics

Abstract

To provide a powder cosmetic that does not cause dullness of the skin and does not become shiny even after time has passed. [Solution] The following components (A), (B), and (C): (A) Titanium dioxide 11% by mass or more, (B) Plate-shaped powder coated with at least zinc oxide, (C) Spherical inorganic powder A powder cosmetic containing [a specific ingredient].

Description

Technical Field

[0001] The present invention relates to powdered cosmetics.

Background Art

[0002] Makeup cosmetics contain titanium oxide, which is one of the coloring pigments, at a high concentration, thereby obtaining the effect of hiding skin dullness and color unevenness. However, there is a problem that a thick coating feeling appears and the color becomes bluish white. Therefore, conventionally, as a means for achieving excellent aesthetics and giving a natural impression, which is the role of makeup, spherical silicone resin, nylon powder, etc. have been used to control the usability and finish on the skin (for example, Patent Document 1, etc.).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, it has been found that the combined use of these has a problem that shininess can be seen due to skin dullness or over time.

Means for Solving the Problems

[0005] Therefore, the present inventor has conducted various studies and found that when titanium oxide is blended at 11% by mass or more, by containing at least plate-like powder coated with zinc oxide and spherical inorganic powder, a powdered cosmetic can be obtained that maintains high covering power and has a bright finish without dullness, suppresses unevenness, suppresses powder floating, and is less likely to become shiny even over time.

[0006] That is, one aspect of the present invention is the following components (A), (B), and (C): (A) 11% by mass or more of titanium oxide, (B) Plate-shaped powder coated with at least zinc oxide, (C) Spherical inorganic powder This invention provides a powder cosmetic containing [a specific ingredient / component]. [Effects of the Invention]

[0007] The powder cosmetic composition of the present invention has coverage after application, a finish that is free from dullness after application, a smooth finish, and a finish that is free from powderiness, even without incorporating the aforementioned spherical silicone resin or other organic resin powders, and furthermore, it can suppress shine even after a long period of time. [Modes for carrying out the invention]

[0008] Terms used herein shall be used in the sense commonly used in the art unless otherwise specified.

[0009] The cosmetic composition of the present invention is a powder cosmetic composition containing a large amount of titanium dioxide in addition to a plurality of inorganic powders, and one embodiment of the present invention is the following components (A), (B) and (C): (A) Titanium dioxide 11% by mass or more, (B) Plate-shaped powder coated with at least zinc oxide, (C) Spherical inorganic powder It is a powdered cosmetic containing [a specific ingredient].

[0010] The titanium dioxide component (A) used in this invention is not limited as long as it is the type commonly used in cosmetics. The titanium dioxide in component (A) may be in anatase, rutile, or amorphous form, with anatase and rutile forms being preferred. The shape may also be spherical, plate-like, needle-like, etc. Specifically, commercially available products such as CR-50 (manufactured by Ishihara Sangyo Co., Ltd.), MP-18, MP-25 (manufactured by Teika Co., Ltd.), and ST-710 (manufactured by Titanium Industry Co., Ltd.) can be used.

[0011] Ingredient (A), titanium dioxide, is preferable to have a number average particle size of 0.01 to 0.5 μm, more preferably 0.05 to 0.4 μm, more preferably 0.1 to 0.35 μm, and even more preferably 0.18 to 0.3 μm, from the viewpoint of improving coverage of uneven skin tone and irregularities, providing a makeup-like appearance, and preventing shine even after a long period of time. The number-average particle size of titanium dioxide is measured using a particle size distribution analyzer based on the laser diffraction / scattering method. Specifically, it is measured using a laser diffraction / scattering particle size distribution analyzer (for example, LA-920, manufactured by Horiba, Ltd.). In this invention, the number-average particle size refers to the arithmetic mean of the particle size of each individual particle. The number-average particle size of other powders contained in this invention is also measured using the same method.

[0012] While titanium dioxide in component (A) can be used as is, it is preferable to include a form that has been hydrophobized to improve the dispersibility of titanium dioxide in cosmetics, the uniformity of the coating film, and to suppress uneven application during coating. Hydrophobic treatments include silicone treatment, alkylsilane treatment, metal soap treatment, and N-acyl amino acid treatment. Silicone treatments include methylhydrogenpolysiloxane treatment and dimethylpolysiloxane treatment, alkylsilane treatments include alkylalkoxysilane treatment, metal soap treatments include zinc stearate treatment and zinc myristate treatment, and N-acyl amino acid treatments include lauroyl lysine treatment, dilauroyl glutamate lysine sodium treatment, stearoyl glutamate disodium treatment, and lauroyl aspartate sodium treatment.

[0013] As for the hydrophobic treatment, at least silicone treatment is preferred, and at least dimethylpolysiloxane treatment is more preferred. Hydrophobic treatment can be carried out by conventional methods. The amount of hydrophobic treatment is preferably 1 to 35% by mass, and more preferably 2 to 7% by mass, relative to the mass of titanium dioxide before hydrophobic treatment, in order to improve the dispersibility of the hydrophobic treated titanium dioxide in the cosmetic, the uniformity of the coating film, and suppress uneven application during coating. Furthermore, when titanium dioxide is subjected to surface treatment such as hydrophobic treatment, the content and number-average particle size of component (A) refer to the content and number-average particle size including the surface-treated agent.

[0014] Component (A) can be one or more types, and from the viewpoint of obtaining coverage after application, a finish without dullness after application, a finish without unevenness, a finish without powderiness, and a finish that does not become shiny even after a long period of time, the content is preferably 11% by mass or more, more preferably 13% by mass or more, even more preferably 15% by mass or more, and even more preferably 19% by mass or more in the total composition. Also from the same viewpoint, 40% by mass or less is preferred, 35% by mass or less is more preferred, 30% by mass or less is even more preferred, and 26% by mass or less is even more preferred. Specifically, 11% by mass or more and 40% by mass or less is preferred, 13% by mass or more and 35% by mass or less is more preferred, 15% by mass or more and 30% by mass or less is even more preferred, and 19% by mass or more and 26% by mass or less is even more preferred.

[0015] The component (B) used in this invention is a plate-like powder coated with at least zinc oxide. Examples of plate-shaped powders include inorganic pigments such as boron nitride, silicic acid, anhydrous silicic acid, magnesium silicate, sericite, talc, mica, kaolin, clay, bentonite, synthetic mica, synthetic fluorphlogopite, titanium mica, bismuth oxychloride, zirconium oxide, magnesium oxide, aluminum oxide, calcium sulfate, barium sulfate, magnesium sulfate, calcium carbonate, and magnesium carbonate. The plate-shaped powder preferably contains one or more selected from mica, synthetic mica, sericite, and talc, with mica being more preferred. Component (B) used in the present invention only needs to have these plate-like powders coated with at least zinc oxide, and may be further hydrophobically treated. Examples of the hydrophobizing agent used here include silicone, alkyl silane, metal soap, N-acyl amino acid, etc. Among these, from the viewpoint of obtaining a non-cloudy finish and a non-powdery finish after coating, metal soap is preferred, zinc fatty acid is more preferred, zinc stearate and zinc myristate are even more preferred, and zinc myristate treatment is even more preferred.

[0016] The coating rate of zinc oxide in the plate-like powder coated with at least zinc oxide is preferably 25% by mass or more, more preferably 40% by mass or more, and even more preferably 49% by mass or more, based on the total powder mass of component (B), from the viewpoints of obtaining a non-cloudy finish and a non-powdery finish after coating, and not causing glare even after a long time. Also, the coating rate is preferably 70% by mass or less, more preferably 60% by mass or less, based on the total powder mass of component (B).

[0017] The coating rate of the hydrophobizing agent in the hydrophobically treated plate-like powder is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and even more preferably 1% by mass or more, based on the total powder mass of component (B), from the viewpoint of obtaining a non-cloudy finish and a non-powdery finish after coating. Also, the coating rate is preferably 10% by mass or less, more preferably 5% by mass or less, and even more preferably 3% by mass or less, based on the total powder mass of component (B).

[0018] The average particle diameter of the plate-like powder of component (B) coated with at least zinc oxide is preferably 1 to 80 μm, more preferably 3 to 50 μm, and even more preferably 5 to 30 μm, from the viewpoints of obtaining a non-cloudy finish and a non-powdery finish after coating. Also, the aspect ratio of the plate-like powder of component (B) coated with at least zinc oxide is preferably 20 to 100, more preferably 30 to 80, from the viewpoint of enhancing the adhesion to the skin. The average particle diameter is the value measured by a laser diffraction scattering type particle size distribution analyzer (manufactured by Seishin Enterprise Co., Ltd., LMS-350) using ethanol as the dispersion medium. The average particle diameter is the volume-based average particle diameter and is taken as the 50% median diameter. The average thickness of the particles is measured using an electron microscope, and the value obtained by dividing the total value by the number of measurements. The aspect ratio is the value obtained by dividing the particle diameter by the average thickness of the particles.

[0019] Component (B) can be used singly or in combination of two or more. From the viewpoints of obtaining good covering power after coating, a non-cloudy finish after coating, a uniform finish, and a non-flaky finish, and not causing shine even after a long time, the content is preferably 1% by mass or more, more preferably 3% by mass or more, still more preferably 5% by mass or more, and even more preferably 8% by mass or more in the total composition. Also, from the same viewpoints, it is preferably 35% by mass or less, more preferably 20% by mass or less, still more preferably 14% by mass or less, and even more preferably 13% by mass or less. Specifically, it is preferably 1% by mass or more and 35% by mass or less, more preferably 3% by mass or more and 20% by mass or less, still more preferably 5% by mass or more and 14% by mass or less, and even more preferably 8% by mass or more and 13% by mass or less. The mass ratio of component (A) to component (B) ((A) / (B)) in the powdered cosmetic of the present invention is preferably 1.2 or more, more preferably 1.3 or more, still more preferably 1.5 or more, and even more preferably 1.8 or more from the viewpoints of obtaining good covering power after coating, a non-cloudy finish after coating, a uniform finish, and a non-flaky finish, and not causing shine even after a long time. Also, from the same viewpoints, the mass ratio ((A) / (B)) is preferably 10 or less, more preferably 7 or less, still more preferably 6 or less, and even more preferably 4 or less. The specific mass ratio ((A) / (B)) is preferably 1.2 or more and 10 or less, more preferably 1.3 or more and 7 or less, still more preferably 1.5 or more and 6 or less, and even more preferably 1.8 or more and 4 or less.

[0020] Component (C) used in the present invention is a spherical inorganic powder other than component (A). The spherical shape includes a perfect sphere, a substantially spherical shape, and an ellipsoid of revolution, and may be a spherical powder with irregularities on the surface. Examples of spherical inorganic powders include anhydrous silicic acid, calcium silicate, and magnesium silicate, but it is preferable that they contain at least anhydrous silicic acid. The anhydrous silicic acid may be a composite powder with a metal oxide, and examples include a composite powder of anhydrous silicic acid containing one or more metal oxides selected from titanium dioxide and zinc oxide. The average particle size of the spherical inorganic powder of component (C) is preferably 1 to 50 μm, more preferably 1 to 35 μm, even more preferably 2 to 25 μm, and even more preferably 3 to 10 μm, from the viewpoint of obtaining coverage after application, a finish without dullness after application, a finish without unevenness, a finish without powder lifting, and a finish that does not become glossy even after a long period of time. The average particle size was measured using a laser diffraction scattering particle size analyzer (Seishin Corporation, LMS-350) with ethanol as the dispersion medium. The average particle size is the volume-based average particle size and is defined as the 50% median diameter.

[0021] Component (C) can be one or more types, and from the viewpoint of obtaining coverage after application, a finish without dullness after application, a finish without unevenness, a finish without powderiness, and a finish that does not become shiny even after a long period of time, the content is preferably 1% by mass or more, more preferably 5% by mass or more, even more preferably 10% by mass or more, and even more preferably 12% by mass or more in the total composition. Also from the same viewpoint, 35% by mass or less is preferred, 30% by mass or less is more preferred, 25% by mass or less is even more preferred, and 20% by mass or less is even more preferred. Specifically, 1% by mass or more and 35% by mass or less is preferred, 5% by mass or more and 30% by mass or less is more preferred, 10% by mass or more and 25% by mass or less is even more preferred, and 12% by mass or more and 20% by mass or less is even more preferred. The mass ratio of component (A) to the total amount of components (B) and (C) in the powder cosmetic composition of the present invention ((A) / ((B)+(C))) is preferably 0.4 or higher, more preferably 0.5 or higher, and even more preferably 0.6 or higher, from the viewpoint of obtaining coverage after application, a finish without dullness after application, a finish without unevenness, a finish without powder lifting, and a finish that does not become shiny even after a long period of time. Also, from the same viewpoint, the mass ratio ((A) / ((B)+(C))) is preferably 2.2 or lower, more preferably 2.1 or lower, and even more preferably 1.9 or lower. Specifically, the mass ratio ((A) / ((B)+(C))) is preferably 0.4 or higher and 2.2 or lower, more preferably 0.5 or higher and 2.1 or lower, and even more preferably 0.6 or higher and 1.9 or lower.

[0022] The powder cosmetic composition of the present invention may also contain (D) an oil that is liquid at 25°C, in addition to the above components. Liquid means having fluidity, and includes paste form. Any liquid oil at 25°C that is commonly used in cosmetics can be used, such as hydrocarbon oils, ester oils, ether oils, silicone oils, and higher alcohols.

[0023] More specifically, examples of hydrocarbon oils include straight-chain or branched-chain hydrocarbon oils such as squalane, liquid paraffin, liquid isoparaffin, polybutene, hydrogenated polyisobutene, hydrogenated polydecene, and petrolatum.

[0024] Examples of ester oils include monoester oils, diester oils, triester oils, and tetraester oils. Examples of monoester oils include monoesters of aliphatic or aromatic monocarboxylic acids or dicarboxylic acids having 2 to 24 carbon atoms. Specific examples include cetyl 2-ethylhexanoate, cetyl octanoate, isononyl isononanoate, isotridecyl isononanoate, hexyl laurate, isopropyl myristate, octyldodecyl myristate, myristyl myristate, 2-hexyldecyl myristate, isopropyl palmitate, octyl palmitate, 2-hexyldecyl butyl palmitate, isocetyl stearate, isocetyl isostearate, decyl oleate, isodecyl benzoate, octyl methoxycinnamate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, 2-ethylhexyl succinate, 2-hexyldecyl adipate, and alkyl benzoates (C12-C15). Examples of diester oils include diesters of dicarboxylic acids having 3 to 18 carbon atoms, and di-fatty acid esters of polyhydric alcohols. Specific examples include propylene glycol dicaprylate, neopentyl glycol dicaprate, glycol distearate, propylene glycol diisostearate, glyceryl diisostearate, glyceryl monomyristate monoisostearate, glyceryl di2-heptylundecanoate, di2-ethylhexyl succinate, diisopropyl sebacate, diisostearyl malate, ethylene glycol di2-ethylhexanoate, diisobutyl adipate, di-2-heptylundecyl adipate, and di-2-ethylhexyl sebacate. Examples of triester oils include tri-fatty acid esters of polyhydric alcohols with a valency of 3 or higher. Specifically, these include glycerin trimyristate, glycerin triisopalmitate, glycerin tri-2-heptylundecanoate, trimethylolpropane triethylhexanoate, trimethylolpropane trioctanoate, tri(caprylic / capric acid)glycerin, glycerin trioleate, glycerin tri-2-ethylhexanoate, glycerin triisostearate, olive oil, jojoba oil, and the like. Examples of tetraester oils include tetra fatty acid esters of polyhydric alcohols with four or more valencies, specifically tetra(behenic acid / benzoic acid / ethylhexanoic acid) pentaerythritol, tetraethylhexanoate pentaerythritol, tetraoctanoate pentaerythritol, and tetra-2-ethylhexanoate pentaerythritol.

[0025] Examples of ether oils include dialkyl ethers, specifically dihexyl ether, dicaprylyl ether, and cetyl-1,3-dimethylbutyl ether.

[0026] Examples of silicone oils include dimethylpolysiloxane, methyl trimethicone, dimethylcyclopolysiloxane, phenyl trimethicone, diphenylsiloxyphenyl trimethicone, diphenyl dimethicone, trimethylpentaphenyltrisiloxysane, and dimethicone diethyl benzalmalonate. Examples of volatile silicone oils include linear dimethylpolysiloxanes such as dimethylpolysiloxane (1 cs), dimethylpolysiloxane (1.5 cs), and dimethylpolysiloxane (2 cs); branched siloxanes such as methyl trimethicone, tris(trimethylsilyl)methylsilane, and tetrakis(trimethylsilyl)silane; and cyclic dimethylsiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane.

[0027] Examples of higher alcohols include those having linear or branched alkyl or alkenyl groups with 10 to 24 carbon atoms, such as lauryl alcohol, myristyl alcohol, isocetyl alcohol, isostearyl alcohol, 2-octyldodecanol, and oleyl alcohol.

[0028] As for the oil component (D), it is preferable that it contains at least hydrocarbon oil, ester oil, and silicone oil, from the viewpoint of obtaining coverage after application, a finish that is not dull after application, a finish that is not uneven, and a finish that is not powdery, and furthermore, suppressing shine after 6 hours.

[0029] Component (D) can be used alone or in combination of two or more types. From the viewpoint of obtaining coverage after application, a finish without dullness after application, a finish without unevenness, and a finish without powderiness, and further suppressing shine after 6 hours, the content is preferably 0.1% by mass or more, more preferably 2% by mass or more, even more preferably 5% by mass or more, and even more preferably 7% by mass or more in the total composition. From a similar viewpoint, 20% by mass or less is preferred, 18% by mass or less is more preferred, 16% by mass or less is even more preferred, and 14% by mass or less is even more preferred. Specifically, 0.1% by mass or more and 20% by mass or less is preferred, 2% by mass or more and 18% by mass or less is more preferred, 5% by mass or more and 16% by mass or less is even more preferred, and 7% by mass or more and 14% by mass or less is even more preferred.

[0030] In addition to the above-mentioned components, the powder cosmetic composition of the present invention may contain components commonly used in cosmetics, such as other powders, other oily components, surfactants, thickeners, preservatives, fragrances, solid UV absorbers, humectants, salts, solvents, antioxidants, chelating agents, neutralizing agents, pH adjusters, blood circulation promoters, cooling agents, antiperspirants, bactericides, skin revitalizers, whitening agents, wrinkle-improving agents, and the like. Other powders include, for example, extender pigments such as talc, sericite, boron nitride, mica, synthetic mica, synthetic fluorphlogopite, kaolin, bentonite, and barium sulfate; other coloring pigments such as cerium oxide, aluminum oxide, yellow iron oxide, black iron oxide, red iron oxide, Prussian blue, and ultramarine; and lustrous pigments. However, from the viewpoint of environmental considerations and superior usability, the powder cosmetic composition of the present invention preferably contains 1% by mass or less of organic resin powder such as microplastics in the total composition, more preferably 0.1% by mass or less, and even more preferably substantially no organic resin powder. The organic resin powder referred to herein is an organic resin powder other than cellulose powder that has excellent biodegradability. Specifically, such organic resin powders refer to organic resin powders other than cellulose powder that have excellent biodegradability. Examples of organic resin powders include crosslinked or non-crosslinked organic resin powders such as powders of one or more polymers or copolymers selected from polyamide resin, nylon resin, polyester resin, polyethylene resin, polytetrafluoroethylene resin, polypropylene resin, polystyrene resin, benzoguanamine resin, polymethylbenzoguanamine resin, polyurethane resin, vinyl resin, fluororesin, acrylic resin, butyl acrylate / vinyl acetate copolymer, styrene / acrylic acid copolymer, silicone resin, and divinylbenzene / styrene copolymer.

[0031] The powdered cosmetic composition of the present invention can be manufactured according to conventional methods. For example, a powdered cosmetic can be produced by mixing and grinding all the powder components containing components (A), (B), and (C), then adding and mixing all the oil components containing component (D), and finally grinding the resulting mixture with a grinder.

[0032] The powdered cosmetic composition of the present invention is in powder form. Specifically, examples include makeup cosmetics such as powder foundation, face powder, face powder, blush, and eyeshadow; and body powders such as body powder and baby powder. Among these, face powder and face powder are preferred, and are suitable as foundation and face powder. [Examples]

[0033] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples.

[0034] Examples 1-7 and Comparative Examples 1-2 Solid powder cosmetics were prepared using the ingredients listed in Tables 1 and 2. Each solid powder cosmetic was applied to the skin, and its coverage after application, the absence of dullness after application, the even finish, the absence of powderiness, and the absence of shine after 6 hours were evaluated. The results are shown in Tables 1 and 2.

[0035] (Manufacturing method) After mixing and grinding all the powder components, including components (A), (B), (C), and (D), an oil was added and mixed, and the resulting mixture was further ground in a grinder. The ground material was filled into a container and molded at a molding pressure of 500 to 2000 kgf to obtain a solid powder cosmetic (foundation).

[0036] (Evaluation method) (1) Coverage after application: Five expert panelists conducted a sensory evaluation of the coverage effect of each solid powder cosmetic (powder foundation) when applied to the skin, using the following criteria. The results are shown as the total score from the five panelists. 5; It has pretty good coverage. 4; It has good coverage. 3; Has moderate coverage 2; Does not provide much coverage 1; Lacks coverage (2) A clear finish after application: Five expert panelists conducted a sensory evaluation of each solid powder cosmetic (powder foundation) after applying it to the skin, assessing its paleness and lack of dullness according to the following criteria. The results are shown as the total scores from the five panelists. 5; Not pale at all, and not dull at all. 4; Not pale or dull 3; Not too pale, and not too dull. 2; Slightly pale and slightly dull 1; pale and dull (3) Even finish: Five expert panelists conducted a sensory evaluation of the evenness of each solid powder cosmetic (powder foundation) when applied to the skin, using the following criteria. The results are shown as the total score from the five panelists. 5; Very uniform finish 4; uniform finish 3; A fairly uniform finish 2; Not a very uniform finish 1; Uneven finish (4) A finish without powderiness: Five expert panelists conducted a sensory evaluation of each solid powder cosmetic (powder foundation) six hours after application to the skin, assessing its resistance to shine according to the following criteria. The results are shown as the total score from the five panelists. 5; Powder doesn't look cakey. 4; The powder doesn't look too powdery. 3; Slightly powdery. 2; powderiness is noticeable. 1; The powderiness is quite noticeable. (5) Lack of shine after 6 hours: Five expert panelists conducted a sensory evaluation of each solid powder cosmetic (powder foundation) six hours after application to the skin, assessing its resistance to shine according to the following criteria. The results are shown as the total score from the five panelists. 5; No shine 4; Not very shiny 3; Slightly shiny 2; It's shiny. 1; It's quite shiny.

[0037] [Table 1]

[0038] [Table 2]

[0039] Tables 1 and 2 show that, when the powder cosmetic of the present invention contains 11% by mass or more of titanium dioxide, and includes at least plate-shaped powder coated with zinc oxide and spherical inorganic powder, it is possible to obtain a powder cosmetic that maintains high coverage while providing a bright finish without dullness, without uneven application or powderiness, and that does not become shiny over time.

Claims

1. The following components (A), (B), and (C): (A) Titanium dioxide 11% by mass or more, (B) Plate-shaped powder coated with at least zinc oxide, (C) Spherical inorganic powder A powder cosmetic containing [a specific ingredient].

2. The powder cosmetic composition according to claim 1, wherein component (C) contains at least anhydrous silicic acid.

3. The powder cosmetic composition according to claim 1, wherein the content of component (A) is 11% by mass or more and 40% by mass or less, the content of component (B) is 1% by mass or more and 35% by mass or less, and the content of component (C) is 1% by mass or more and 35% by mass or less.

4. The powder cosmetic composition according to claim 1, wherein the coating rate of zinc oxide in component (B) is 25% by mass or more.

5. (B) The powder cosmetic according to claim 1, wherein the plate-shaped powder coated with at least zinc oxide is further treated with fatty acid zinc.

6. The powder cosmetic composition according to claim 1, wherein the mass ratio of component (A) to component (B) ((A) / (B)) is 1.2 or more and 10 or less.

7. Furthermore, the powder cosmetic composition according to claim 1, further comprising (D) 0.1% by mass or more and 20% by mass or less of a liquid oil at 25°C.

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