Cosmetic composition

Abstract

To provide a cosmetic composition which is finely visible from any direction and is used for sites other than the face.SOLUTION: One aspect of the present invention is a cosmetic composition for fine vision for the body (excluding the face) containing a substance A having blue reflected interference light. The content of the substance A is 5 to 50% by mass when the cosmetic composition is 100% by mass. Furthermore, the cosmetic composition has an L * value of 75 or more and less than 95 in the JISZ8781 * a * b * color space measured in accordance with CIE1976L 4:2013.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a cosmetic composition. [Background technology]

[0002] In recent years, a method of creating shadows on the face using highlighting and shading to make the face appear smaller has become popular. Specifically, shadows can be created by using cosmetics that are darker than the skin color on the sides of the face and along the jawline, and cosmetics that are lighter than the skin color or have a reflective effect on the T-zone and cheeks. Patent Document 1 discloses cosmetics that contain aluminum powder and a film-forming agent and have excellent concealing properties due to light reflection. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2-304015 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the slimming effect of conventional highlighting and shading was limited to one direction, making it difficult to use on areas other than the face. Also, uneven skin tone could prevent the slimming effect from being achieved.

[0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cosmetic composition that makes the wearer look slimmer from any direction and that can be used on areas other than the face. [Means for solving the problem]

[0006] As a result of extensive research, the present inventors have found that the above-mentioned problems can be solved by using a substance that has specific reflected interference light and further adjusting the brightness of the cosmetic composition, and have thus completed the present invention.

[0007] According to the present invention, the following is provided: [1] A cosmetic composition comprising: Contains substance A that has blue reflected interference light, the content of the substance A is 5 to 50% by mass when the cosmetic composition is taken as 100% by mass, CIE1976L measured in accordance with JIS Z 8781-4:2013 of the above cosmetic composition * a * b * L in color space * A cosmetic composition for slimming use on the body (excluding the face) having a value of 75 or more but less than 95. [2] A cosmetic composition comprising: Contains substance A that has blue reflected interference light, CIE1976L measured in accordance with JIS Z 8781-4:2013 of the above cosmetic composition * a * b * L in color space * A cosmetic composition for slimming use on the body (excluding the face) having a value of 75 or more and less than 87. [3] The cosmetic composition according to [2], wherein the content of the substance A is 5 to 50% by mass when the cosmetic composition is taken as 100% by mass. [4] The cosmetic composition according to any one of [1] to [3], wherein the reflected interference light has a maximum peak wavelength of 390 to 490 nm. [5] The cosmetic composition according to any one of [1] to [4], wherein the substance A is a titanium oxide-coated powder having an average particle size of 5 to 50 μm. [6] The cosmetic composition according to any one of [1] to [5], wherein the cosmetic composition is applied evenly to the curved surface of a semi-cylinder having one rectangular flat surface and the other curved surface, the semi-cylinder is placed on a flat surface so that the flat surface abuts the flat surface, and an LED light is irradiated onto the curved surface perpendicular to the flat surface. In an image of the semi-cylinder taken from above the top of the curved surface, the brightness of the RGB-decomposed blue image (count value per pixel) satisfies the following formula: (Brightness of the top of the head) / (Brightness of the periphery) ≥ 6.0 (Equation 1) [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a cosmetic composition that makes the wearer look slimmer from any direction and that can be used on areas other than the face. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram showing the principle of reflected interference light of the titanium oxide coated powder material according to this embodiment. [Figure 2] FIG. 2 is a schematic diagram illustrating the measurement of the ratio of brightness of the top of a semi-cylinder model to brightness of its periphery, according to this embodiment. [Figure 3] FIG. 3 is a diagram showing the top and peripheral areas of the head when measuring the ratio of brightness of the top to the brightness of the peripheral areas in a semi-cylinder model according to this embodiment. [Figure 4] FIG. 4 is a diagram showing the measurement results of the maximum peak wavelength of the reflected interference light of the substances used in the examples and comparative examples. [Figure 5] FIG. 5 shows photographs of a hemisphere without any cosmetic composition applied thereto and a hemisphere after the cosmetic composition of Example 1 has been applied thereto. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present invention will be described in detail below. The present invention is not limited to these descriptions. The features of the following embodiments can be combined with each other. Furthermore, each feature can be an invention independently. Furthermore, elements of the following embodiments that are not defined in the claims are optional elements and can be omitted.

[0011] <Terminology> In this specification, for example, the description "X to Y" means equal to or greater than X and equal to or less than Y. In this specification, any number of "0"s (for example, one or two) may be added to the end of a numerical value. For example, one or two "0"s may be added after "1.4" to make it "1.40" or "1.400."

[0012] 1. Cosmetic compositions The cosmetic composition according to the present embodiment contains a substance A having blue reflected interference light (hereinafter, simply referred to as "substance A"). Note that "blue reflected interference light" in this specification includes blue to blue-purple reflected interference light (e.g., wavelengths of 390 to 490 nm). Furthermore, "having blue reflected interference light" in this specification means having primarily blue reflected interference light, and can be one that appears blue in color. That is, substance A may have reflected interference light of colors other than blue as long as it appears blue, and the intensity of the blue reflected interference light can be relatively stronger than the intensity of the reflected interference light of colors other than blue. By having reflected interference light of colors other than blue, substance A can be excluded from substances that do not have a blue color. When a cosmetic composition containing such substance A is used, when the skin is viewed from any direction, the front portion of the skin appears bright and the side portions of the skin appear dark, providing an appropriate contrast between the front and side portions of the skin, resulting in an excellent slimming effect. Substance A according to the present embodiment will be described in detail below.

[0013] 1.1 Substance A The maximum peak wavelength of the reflected interference light of substance A according to this embodiment is preferably 390 to 490 nm, more preferably 390 to 470 nm. The maximum peak wavelength of the reflected interference light of substance A is, for example, 390, 400, 410, 420, 430, 440, 450, 460, 470, 480, or 490 nm, and may be within a range between any two of the values ​​exemplified herein. The reflected interference light can be measured, for example, by the method described in JP 2022-007124 A. Specifically, a sample is prepared by attaching double-sided tape to black paper, and then uniformly applying substance A to be measured thereon with a cosmetic brush. The wavelength at the peak of the spectral reflectance (%) measured in the range of 350 to 700 nm using a spectrophotometer can be used. If there are multiple peaks, the wavelength at which the spectral reflectance (%) at each peak is maximum can be used. When the maximum peak wavelength of the reflected interference light is within this range, the difference in brightness between the front and side of the skin when the cosmetic composition is used becomes appropriate, and further, glare is reduced, the skin tone becomes a natural skin color, and the effect of making the skin look slimmer is excellent.

[0014] Substance A according to this embodiment is not particularly limited as long as it has blue reflected interference light, and an example of substance A according to this embodiment is a titanium oxide-coated powder material. FIG. 1 is a schematic diagram illustrating the principle of reflected interference light of a titanium oxide-coated powder material. As shown in FIG. 1, the color tone of the reflected interference light of the titanium oxide-coated powder material can be adjusted by changing the film thickness of the titanium oxide. Examples of substrates for titanium oxide-coated powder materials include natural mica, synthetic mica, alumina, silica, borosilicate glass, bismuth oxychloride, and boron nitride, and titanium oxide-coated mica is particularly preferred as substance A according to this embodiment. Examples of substance A in this embodiment include Ronastar (registered trademark) Blue Lights (manufactured by Merck), Timiron (registered trademark) Silk Blue (manufactured by Merck), Helios (registered trademark) R10B (manufactured by Topy Industries, Ltd.), COVERLEAF PC-2035BS (Ikeda Bussan Co., Ltd.), Chione HD Graphic Blue S630V (manufactured by DIC Corporation), Flamenco Silk Blue 630M (manufactured by DIC Corporation), Flamenco Summit Blue B30D (manufactured by DIC Corporation), Flamenco Super Blue 630Z (manufactured by DIC Corporation), Flamenco Blue 620C (manufactured by DIC Corporation), and Flamenco Summit Aqua A80H (manufactured by DIC Corporation).

[0015] The average particle size of substance A according to this embodiment is preferably 5 to 50 μm, and more preferably 10 to 40 μm. The average particle size of substance A is, for example, 5, 10, 15, 20, 25, 30, 35, 40, 45, or 50 μm, and may be within a range between any two of the values ​​exemplified herein. The average particle size of substance A can be, for example, the particle size at 50% of the cumulative value in the volume-based particle size distribution determined by laser diffraction / scattering. When the average particle size of substance A is equal to or greater than the lower limit, structure retention is enhanced, improving production efficiency. When the average particle size of substance A is equal to or less than the upper limit, scattered particles are less visible when applied to the skin, resulting in a more uniform skin surface. Furthermore, the cosmetic composition reduces glare and provides a natural skin tone, resulting in an excellent slimming effect.

[0016] The shape of substance A according to this embodiment is not particularly limited, and examples thereof include spherical, approximately spherical, layered, and plate-like shapes. Plate-like shapes are particularly preferred as the shape of substance A according to this embodiment. When substance A has a plate-like shape, the orientation of the cosmetic composition upon application to the skin is improved, resulting in a more excellent slimming effect. The aspect ratio of substance A according to this embodiment may be 10 to 200, and may be, for example, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, or 200, or may be within a range between any two of the values ​​exemplified here. The aspect ratio may be the major axis / thickness of substance A.

[0017] The content of substance A according to this embodiment is preferably 5 to 50% by mass, and more preferably 5 to 30% by mass, when the cosmetic composition is taken as 100% by mass. The content of substance A is, for example, 5, 10, 15, 20, 25, 30, 35, 40, 45, or 50% by mass, and may be within a range between any two of the values ​​exemplified here. When the content of substance A is equal to or greater than the lower limit, the contrast between the front and side of the skin when the cosmetic composition is used is appropriate, resulting in a more excellent slimming effect. When the content of substance A is equal to or less than the upper limit, the glare when the cosmetic composition is used is reduced, the skin tone becomes more natural, the contrast between the front and side is not excessive, and ultimately, the slimming effect is more excellent.

[0018] 1.2 Base powder The cosmetic composition according to this embodiment preferably further comprises a base powder. The base powder is a substance that does not have blue reflected interference light and does not have a blue color tone, and is preferably a substance whose reflected interference light has a maximum peak wavelength of less than 390 nm or more than 490 nm. In other words, the above-mentioned substance A is excluded as the base powder. By using the base powder, uneven skin tone can be reduced. The base powder according to this embodiment is a powder having a CIE1976L (Chemical Integrity Element) measured in accordance with JIS Z 8781-4:2013. * a * b * L in color space * The L value of the base powder is preferably 75 to 95, and more preferably 80 to 90. * The value is, for example, 75, 80, 82, 83, 84, 86, 88, 90, or 95, and may be within a range between any two of the values ​​exemplified here. Here, the base powder may be a mixture of two or more types of powder, and the mixture of two or more types is the above-mentioned L * It is preferable that the L value of the base powder is satisfied. * When the value is equal to or greater than the lower limit, uneven skin tone can be appropriately reduced when the cosmetic composition is used, and furthermore, the effect of making the skin look slimmer can be excellent. * When the value is equal to or less than the upper limit, the skin tone does not become too uniform when the cosmetic composition is used, and as a result, the skin appears slimmer.* The value can be adjusted by the amount of impurities, etc.

[0019] Examples of the base powder according to this embodiment include mica, talc, and silica, with mica being particularly preferred. The shape of the base powder according to this embodiment may be, for example, spherical, approximately spherical, layered, or plate-like, with high aspect ratio shapes such as plate-like being particularly preferred. The aspect ratio of the base powder according to this embodiment may be 50 to 200, preferably 75 to 200, and more preferably 80 to 200. The aspect ratio of the base powder according to this embodiment may be, for example, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, or 200, or may be within a range between any two of the values ​​exemplified here. The aspect ratio may be the ratio of the major axis to the thickness of the base powder. When the aspect ratio of the base powder is high, the orientation of the cosmetic composition when applied to the skin improves, the effect of substance A is more easily obtained, and the slimming effect is more excellent.

[0020] 1.3 Other additives The cosmetic composition according to this embodiment may contain other additives such as inorganic pigments, organic pigments, surfactants, water-soluble components, oils, medicines, moisturizers, preservatives, and UV absorbers, provided that the effects of the present invention are not impaired. The content of the other additives according to this embodiment is preferably 10% by mass or less, and more preferably 5% by mass or less, when the cosmetic composition is taken as 100% by mass.

[0021] Examples of inorganic pigments that can be used in this embodiment include kaolin, calcium carbonate, red iron oxide, yellow iron oxide, black iron oxide, ultramarine, red iron oxide, sintered pigment, ultramarine pink, chromium hydroxide, yellow iron oxide, chromium oxide, aluminum cobalt oxide, Prussian blue, black iron oxide, carbon black, silicic anhydride, magnesium silicate, bentonite, zirconium oxide, magnesium oxide, zinc oxide, tin oxide, light calcium carbonate, heavy calcium carbonate, light magnesium carbonate, heavy magnesium carbonate, calamine, nylon powder, polymer resin powder, and natural polymer powder. These pigments may be hydrophobized. Examples of hydrophobizing agents include silicone, higher fatty acids, higher alcohols, fatty acid esters, metal soaps, amino acids, and alkyl phosphates.

[0022] Examples of the surfactant according to the present embodiment include nonionic surfactants such as sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, glycerin fatty acid esters, polyglycerin fatty acid esters, ethylene oxide derivatives of glycerin fatty acid esters, ethylene oxide derivatives of propylene glycol fatty acid esters, propylene glycol fatty acid esters, polyethylene glycol fatty acid esters, sucrose esters, polyoxyethylene alkyl ethers, polyoxypropylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene castor oil derivatives, polyoxyethylene hydrogenated castor oil derivatives, polyoxyethylene phytostanol ethers, polyoxyethylene phytosterol ethers, polyoxyethylene cholestanol ethers, polyoxyethylene cholesteryl ethers, and polyoxyalkylene-modified organopolysiloxanes; fatty acid soaps, anionic surfactants such as ether carboxylic acids and their salts, carboxylates such as condensates of amino acids and fatty acids, alkyl sulfonates, alkene sulfonates, sulfonates of fatty acid esters, sulfonates of fatty acid amides, sulfonates such as alkyl sulfonates and their formalin condensates, alkyl sulfate salts, secondary higher alcohol sulfate salts, alkyl and allyl sulfate salts, sulfate salts of fatty acid esters, sulfate salts of fatty acid alkylolamides, sulfate salts such as turpentine oil, alkyl phosphates, ether phosphates, alkyl allyl ether phosphates, and amide phosphates; cationic surfactants such as alkyl amine salts, amine salts such as alkyl amine salts, polyamines, and amino alcohol fatty acid derivatives, alkyl quaternary ammonium salts, aromatic quaternary ammonium salts, pyridium salts, and imidazolium salts; and amphoteric surfactants such as betaine, aminocarboxylates, and imidazoline derivatives.

[0023] Examples of the water-soluble component according to this embodiment include monoalcohols such as methanol, ethanol, propanol, isopropanol, and benzyl alcohol, and polyhydric alcohols such as glycerin, ethylene glycol, diethylene glycol, triethylene glycol, hexanediol, butylene glycol, heptanediol, 2,4 hexylene glycol, 1,5 pentanediol, 1,4 butanediol, propylene glycol, 1,3 butylene glycol, dipropylene glycol, polyethylene glycol, and polyglycerin, as well as derivatives thereof. Further examples of the water-soluble component according to this embodiment include organic acids and organic salts (amino acids, amino acid salts, and oxyacid salts).

[0024] As the oil component according to the present embodiment, almost all commonly used oil categories such as hydrocarbon oil, ester oil, silicone oil, etc. can be used. Specific examples include hydrocarbon oil waxes such as squalane, paraffin oil, paraffin wax, microcrystalline wax, ozokerite, and ceresin; waxes such as beeswax, spermaceti, carnauba wax, and candelilla wax; natural animal fats and oils such as olive oil, camellia oil, and lanolin; fatty acids having 10 to 20 carbon atoms, higher alcohols having 10 to 20 carbon atoms, and their esters; silicone oils such as dialkyl polysiloxanes such as dimethyl polysiloxane, dimethyl cyclo polysiloxane, and diethyl polysiloxane; alkylaryl polysiloxanes such as methyl phenyl polysiloxane; diaryl polysiloxanes, fatty acid-modified polysiloxanes, higher alcohol-modified polysiloxanes, and amino-modified polysiloxanes; silicone resins such as trimethylsiloxysilicate; and silicone rubber.

[0025] Examples of the drug according to this embodiment include disinfectants, anti-inflammatory agents, vitamin preparations, and the like.

[0026] Examples of the moisturizing agent according to this embodiment include mannitol, sorbitan, sorbitol, maltitol, maltotriose, mucopolysaccharides, sodium lactate, pantethine, and sodium pyrrolidone carboxylate.

[0027] Examples of preservatives according to this embodiment include methyl parahydroxybenzoate, ethyl parahydroxybenzoate, propyl parahydroxybenzoate, butyl parahydroxybenzoate, benzoic acid, sodium benzoate, sorbic acid, potassium sorbate, and phenoxyethanol.

[0028] Examples of the ultraviolet absorber according to this embodiment include benzoic acid-based ultraviolet absorbers such as para-aminobenzoic acid, para-aminobenzoic acid monoglycerin ester, N,N-dipropoxypara-aminobenzoic acid ethyl ester, N,N-diethoxypara-aminobenzoic acid ethyl ester, N,N-dimethylpara-aminobenzoic acid ethyl ester, and N,N-dimethylpara-aminobenzoic acid butyl ester; anthranilic acid-based ultraviolet absorbers such as homomenthyl-N-acetylanthranilate; amyl salicylate, menthyl salicylate, homomenthyl salicylate, salicylic acid-based ultraviolet absorbers such as octyl salicylate, octyl salicylate, phenyl salicylate, benzyl salicylate, and p-isopropanol phenyl salicylate; octyl cinnamate, ethyl 4-isopropyl cinnamate, methyl 2,5-diisopropyl cinnamate, ethyl 2,4-diisopropyl cinnamate, methyl 2,4-diisopropyl cinnamate, propyl p-methoxycinnamate, isopropyl p-methoxycinnamate, isoamyl p-methoxycinnamate, octyl p-methoxycinnamate, Cinnamic acid-based UV absorbers such as cyclohexyl cinnamate (2-ethylhexyl-p-methoxycinnamate), 2-ethoxyethyl-p-methoxycinnamate, cyclohexyl-p-methoxycinnamate, ethyl-α-cyano-β-phenylcinnamate, 2-ethylhexyl-α-cyano-β-phenylcinnamate, and glyceryl mono-2-ethylhexanoyl-di-para-methoxycinnamate; 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, and 2,2'-dihydroxy-4,4' benzophenone-based ultraviolet absorbers such as dimethoxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-4'-methylbenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonate, 4-phenylbenzophenone, 2-ethylhexyl-4-phenylbenzophenone-2-carboxylate, 2-hydroxy-4-n-octoxybenzophenone, and 4-hydroxy-3-carboxybenzophenone;Examples include 3-(4'-methylbenzylidene)-d,1-camphor, 3-benzylidene-d,1-camphor, urocanic acid, urocanic acid ethyl ester, 2-phenyl-5-methylbenzoxazole, 2,2'-hydroxy-5-methylphenylbenzotriazole, 2-(2'-hydroxy-5'-t-octylphenyl)benzotriazole, 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, dibenzalazine, dianisoylmethane, 4-methoxy-4'-t-butyldibenzoylmethane, 5-(3,3-dimethyl-2-norbornylidene)-3-pentan-2-one, and the like;

[0029] 1.4 Properties of the cosmetic composition 1.4.1 L of cosmetic compositions * value The cosmetic composition according to this embodiment has a CIE1976L * a * b * L in color space * The L value of the cosmetic composition is preferably 75 or more and less than 95, and more preferably 75 or more and less than 87. * The value may be, for example, 75, 80, 82, 83, 84, 85, 86, 86.9, 88, 90, 92, or 94.9, or may be within a range between any two of the values ​​exemplified herein. * When the value is equal to or greater than the lower limit, uneven skin tone can be appropriately reduced when used, and the cosmetic composition has an excellent slimming effect. * When the value is equal to or less than the upper limit, the skin tone does not become too uniform when used, and the effect of making the skin look slimmer is excellent. * The value is the L * This can be adjusted by the value of the reflection wavelength and the color of the reflected interference light of substance A (more specifically, the maximum peak wavelength of the reflected interference light).

[0030] 1.4.2 Brightness ratio between the top and periphery of the head in the semi-cylindrical model The cosmetic composition according to this embodiment preferably has a ratio of the brightness of the crown to the brightness of the periphery when applied to a semi-cylinder of 6.0 or greater. Figures 2 and 3 show schematic diagrams illustrating the measurement of the ratio of the brightness of the crown to the brightness of the periphery. As shown in Figures 2 and 3, a semi-cylinder (semi-cylinder model) having one rectangular flat surface and the other curved surface is placed on a flat surface so that the flat surfaces abut against each other. The diameter of the semi-cylinder can be, for example, 5 to 10 cm or 7 to 9 cm. Black paper is attached to the curved surface of the semi-cylinder so as to cover at least a portion of the circumferential direction of the curved surface, and double-sided tape is further attached to the black paper. The circumferential direction of the size of the black paper and double-sided tape can be the length of the semi-circumference of the semi-cylinder. Furthermore, the lengthwise dimensions of the black paper and double-sided tape can be such that (black paper) ≧ (double-sided tape) (in FIG. 2, (black paper) = (double-sided tape)), and the lengthwise dimension of the double-sided tape can be, for example, 1 to 3 cm. Furthermore, the cosmetic composition according to the present embodiment is uniformly applied to the entire surface of the double-sided tape (the area where the cosmetic composition is applied). An LED light is irradiated onto the curved surface perpendicular to the plane. The center of the LED light and the center of the camera used for photographing are positioned on a line passing through the center (vertex) of the area where the cosmetic composition is applied and perpendicular to the plane. In an image taken with a camera, the semi-cylinder is positioned above the vertex of the curved surface (specifically, on a line passing through the center (vertex) of the area where the cosmetic composition is applied and perpendicular to the plane) so that the entire area where the cosmetic composition is applied is included, and it is preferable that the brightness (count value per pixel) of the RGB-decomposed blue image satisfies the following formula: ImageJ, for example, can be used as image analysis software. (Brightness of the top of the head) / (Brightness of the periphery) ≥ 6.0 (Equation 1) Here, "top of the head" refers to the two central rectangular portions of the semi-cylinder where the cosmetic composition is applied, divided into 20 equal parts in the circumferential direction when viewed from above. "Periphery" refers to the two rectangular portions at the ends of the semi-cylinder where the cosmetic composition is applied, divided into 20 equal parts in the circumferential direction when viewed from above. (The top of the head and peripheral portion are illustrated in Figure 3.) The "brightness of the top of the head" and the "brightness of the peripheral portion" can be the average values ​​of the brightness (count value per pixel) at the top of the head and peripheral portion, respectively. Furthermore, in an image of the semi-cylinder photographed from above the top of the curved surface, it is preferable that the brightness of the blue image obtained by RGB decomposition further satisfies the following formula: (Brightness of the top of the head) / (Brightness of the periphery)≦7.0 (Equation 2) In other words, when (brightness of the top of the head) / (brightness of the peripheral area) is S, the value of S is preferably 6.0 to 7.0, and more preferably 6.2 to 6.9. The value of S may be, for example, 6.0, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, or 7.0, and may be within a range between any two of the values ​​exemplified here. When the value of S is equal to or greater than the lower limit, the contrast between the front and side of the skin when the cosmetic composition is used becomes appropriate, resulting in a more excellent slimming effect. When the value of S is equal to or less than the upper limit, the balance of shadows between the center and peripheral area is maintained, resulting in a more excellent slimming effect.

[0031] 1.5 Implementation A cosmetic composition according to one embodiment (first aspect) of the present invention contains a substance A that exhibits blue reflected interference light, the content of the substance A being 5 to 50% by mass when the cosmetic composition is taken as 100% by mass, and the cosmetic composition has a CIE1976L (Chemical Integrity Effect) measured in accordance with JIS Z 8781-4:2013. * a * b * L in color space *The cosmetic composition according to the first aspect is a cosmetic composition for the body (excluding the face) that makes the skin look slimmer, having a value of 75 or more and less than 95. The cosmetic composition according to the first aspect uses a specific amount of substance A that has blue reflected interference light, and further adjusts the brightness of the cosmetic composition by adjusting the types and amounts of the ingredients, thereby making the cosmetic composition slimmer from any direction when used on parts of the body other than the face. Furthermore, a cosmetic composition according to another embodiment (second aspect) of the present invention contains a substance A that exhibits blue reflected interference light, and has a CIE1976L (Chemical Integrity Effect) of the cosmetic composition measured in accordance with JIS Z 8781-4:2013. * a * b * L in color space * The cosmetic composition according to the second aspect is a cosmetic composition for the body (excluding the face) that makes the skin look slimmer, having a value of 75 or more and less than 87. The cosmetic composition according to the second aspect uses substance A that has blue reflected interference light, and further adjusts the lightness of the cosmetic composition to a high degree by adjusting the types and amounts of the ingredients containing substance A, thereby making the cosmetic composition slimmer from any direction when used on parts of the body other than the face.

[0032] The slimming effect of the cosmetic composition according to this embodiment is thought to be due to the flip-flop effect. When a curved surface is applied with the cosmetic composition according to this embodiment, the front part to a third party observing it appears bright because it produces a large specular reflection of the incident light, whereas the side part appears dark because it only produces a small amount of diffuse reflection of the incident light. The cosmetic composition according to this embodiment has a L * By setting the value within a specific range, uneven skin tone is appropriately reduced, resulting in a more pronounced flip-flop effect. Furthermore, the cosmetic composition according to this embodiment contains substance A, which has a specific reflected interference light, and thus the color tone is adjusted, resulting in a more appropriate contrast between the front and side portions, thereby creating a slimming effect. Furthermore, in one embodiment, the cosmetic composition according to this embodiment contains substance A within a specific range, thereby reducing the glare felt when used, resulting in a natural skin tone, and creating a more appropriate contrast between the front and side portions, ultimately creating a slimming effect.

[0033] 2. Method for preparing cosmetic compositions A known method can be used to prepare the cosmetic composition according to this embodiment. The cosmetic composition according to this embodiment is typically a powder mixture. For example, a method for preparing the cosmetic composition according to this embodiment includes mixing a substance A having blue reflected interference light and a base powder (and optionally other additives).

[0034] 3. Method of using the cosmetic composition The cosmetic composition according to this embodiment can be used on the body (excluding the face), and is particularly suitable for use on cylindrical areas such as the arms, legs, and neck, which can be viewed from any direction. When the cosmetic composition according to this embodiment is used on these areas, when viewed from any direction, the front of the skin appears bright and the side of the skin appears dark, creating an appropriate contrast between the front and side of the skin, resulting in an excellent slimming effect. The cosmetic composition according to this embodiment is preferably applied to the skin surface at a thickness of 50 μm or less. This thickness facilitates the formation of a uniform coating film, which tends to produce a contrast between the front and side of the skin. [Example]

[0035] The present invention will be described in more detail below with reference to examples. Note that the examples described below are representative examples of the present invention and should not be construed as narrowing the scope of the present invention.

[0036] <Titanium oxide coated powder> The titanium oxide-coated powders (Substances 1-6) used in the Examples and Comparative Examples are listed in Table 1. The maximum peak wavelength of the reflected interference light for Substances 1-6 was determined by attaching double-sided tape to black paper, uniformly applying the substance to be measured with a cosmetic brush, and measuring the sample in the range of 350-700 nm using a spectrophotometer (Shimadzu Corporation, SolidSpec 3700DUV). When there were multiple peaks, the wavelength at which the spectral reflectance (%) of each peak was maximized was used. The measurement results for Substances 1-6 are shown in Figure 4 and Table 1.

[0037] [Table 1]

[0038] <Examples and Comparative Examples> Cosmetic compositions were prepared by mixing substances and base powders (note that the maximum peak wavelength of reflected interference light for all base powders was less than 390 nm or more than 490 nm) according to the compositions shown in Table 2. Table 2 shows the results of the tests and evaluations performed on each cosmetic composition, as described below. Figure 5 also shows images of a hemisphere without any cosmetic composition applied and a hemisphere after the cosmetic composition of Example 1 was applied.

[0039] (Base Powder and Cosmetic Composition L * value) For each base powder and each cosmetic composition, CIE1976L measured in accordance with JIS Z 8781-4:2013 * a * b * L in color space * The values ​​were measured using a color difference meter (SE6000 manufactured by Nippon Denshoku Industries Co., Ltd.).

[0040] (Brightness ratio between the top and periphery of the head in a semi-cylindrical model) As shown in FIG. 2, black paper was attached to the curved surface of a semi-cylinder with a diameter of approximately 8 cm, one side of which was a rectangular flat surface and the other side a curved surface, so as to cover at least a portion of the circumferential direction of the curved surface. Furthermore, double-sided tape of the same size as the black paper was attached to the black paper. The size of the black paper and double-sided tape was approximately half the circumference of the semi-cylinder in the circumferential direction and approximately 2 cm in the longitudinal direction. Each cosmetic composition was then evenly applied to the entire surface of the double-sided tape using a cosmetic puff to create a semi-cylinder model. As shown in FIG. 3, the semi-cylinder model was placed on a flat surface so that the flat surface of the semi-cylinder model abutted against the flat surface. An LED light was irradiated perpendicular to the plane onto the area where the cosmetic composition had been applied, and the entire area where the cosmetic composition had been applied was photographed using a camera from above the vertex of the curved surface of the semi-cylinder (specifically, on a line passing through the center (vertex) of the area where the cosmetic composition had been applied and perpendicular to the plane). The center of the LED light and the center of the camera used for photographing were positioned on a line passing through the center of the area where the cosmetic composition was applied (top of the head) and perpendicular to the plane. In the photographed image, the average brightness (count value per pixel) of the RGB-decomposed blue image of the top and peripheral areas shown in Figure 3 was calculated using image analysis software (ImageJ).

[0041] (No glare on the skin) A sensory evaluation was carried out by 10 skilled experts to determine whether each cosmetic composition left a shiny feeling on the skin when applied. Evaluation was carried out according to the following evaluation criteria, and an average score was calculated. 5 points: No glare 4 points: Slightly no glare 3 points: Neither 2 points: Slight glare 1 point: Very glaring

[0042] (Looks slimmer) Each cosmetic composition was applied to the thigh and lower leg of one subject. Ten experts evaluated the appearance of the applied area from any direction as slimmer than when the composition was not applied, on a two-point scale, and the total score was calculated. 1 point: Looks slimmer 0 points: No change

[0043] [Table 2]

[0044] The results in Figure 5 show that when the cosmetic composition of Example 1 according to the present invention was used, an appropriate contrast was achieved compared to before application of the cosmetic composition. The results in Table 2 show that when the cosmetic compositions of Examples 1 to 3 according to the present invention were used, the effect of making the skin look slimmer from any direction was achieved. On the other hand, the results in Table 2 show that when the cosmetic compositions of Comparative Examples 1 to 9, which do not satisfy the configuration of the present invention, were used, the effect of making the skin look slimmer from any direction was not achieved.

Claims

1. 1. A cosmetic composition comprising: Contains a substance A having blue reflected interference light, the content of the substance A is 5 to 50% by mass when the cosmetic composition is taken as 100% by mass, CIE1976L measured in accordance with JIS Z 8781-4:2013 of the cosmetic composition ＊ a ＊ b ＊ L in color space ＊ A cosmetic composition for slimming use on the body (excluding the face) having a value of 75 or more but less than 95.

2. 1. A cosmetic composition comprising: Contains a substance A having blue reflected interference light, CIE1976L measured in accordance with JIS Z 8781-4:2013 of the cosmetic composition ＊ a ＊ b ＊ L in color space ＊ A cosmetic composition for slimming use on the body (excluding the face) having a value of 75 or more but less than 87.

3. 3. The cosmetic composition according to claim 2, wherein the content of said substance A is 5 to 50% by mass when the cosmetic composition is taken as 100% by mass.

4. 3. The cosmetic composition according to claim 1, wherein the maximum peak wavelength of the reflected interference light is 390 to 490 nm.

5. 3. The cosmetic composition according to claim 1, wherein said substance A is a titanium oxide-coated powder having an average particle size of 5 to 50 μm.

6. 3. The cosmetic composition according to claim 1 or 2, wherein the cosmetic composition is uniformly applied to the curved surface of a semicylinder having one rectangular flat surface and the other curved surface, the semicylinder is placed on a flat surface so that the flat surface abuts the flat surface, and an LED light is irradiated onto the curved surface perpendicular to the flat surface; in an image of the semicylinder photographed from above the top of the curved surface, the brightness (count value per pixel) of an RGB-decomposed blue image satisfies the following formula: (Brightness of the top of the head) / (Brightness of the periphery)≧6.0 (Equation 1)

Images