Powder solid cosmetic

Abstract

[Problem] The purpose of the present invention is to provide a powder solid cosmetic which suppresses the occurrence of odor in a powder solid cosmetic in which tranexamic acid is blended. The purpose of the present invention is also to provide a powder solid cosmetic having excellent impact resistance and feeling of use, and having a high ultraviolet protection effect. [Solution] This powder solid cosmetic is characterized by containing (A) tranexamic acid or a derivative thereof or a salt thereof, (B) a fatty acid or a salt thereof, and (C) particulate zinc oxide.

Description

Technical Field

[0001] The present invention relates to a powdered solid cosmetic which suppresses the deodorization of a powdered solid cosmetic containing tranexamic acid and has an excellent feeling during use. Background Art

[0002] Tranexamic acid is incorporated into cosmetics to impart whitening effects and improve skin roughness. However, depending on the combination of other ingredients incorporated into the cosmetic, the inclusion of tranexamic acid can sometimes lead to issues related to stability over time, such as discoloration and odor.

[0003] For example, Patent Document 1 describes that the addition of a specific acetophenone derivative can suppress discoloration caused by heat or time due to the combined use of tranexamic acid derivatives and sugars. Furthermore, Patent Document 2 describes that the addition of nicotinamide can suppress the sulfur odor that is exacerbated by the combined use of tranexamic acid and sulfur-containing compounds.

[0004] During the research and development process of the present inventors, it was discovered that powdered solid cosmetics using tranexamic acid in combination with fatty acids or their salts would develop odor when stored in an environment exposed to light, such as a display case. This became a problem.

[0005] Furthermore, when a suitable amount of UV absorber is added to powdered solid cosmetics to achieve a high UV protection effect, there arise usability issues such as insufficient impact resistance and a reduced dry feeling after application to the skin.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Laid-Open No. 2022-158539

[0009] Patent Document 2: Japanese Patent Application Laid-Open No. 2022-51529 Summary of the Invention

[0010] Problems to be solved by the invention

[0011] An object of the present invention is to provide a powdered solid cosmetic which can suppress the deodorization caused by a powdered solid cosmetic comprising tranexamic acid and a fatty acid or a salt thereof in combination and has an excellent feeling during use.

[0012] The inventors have conducted intensive studies to solve the aforementioned problems and have found that by adding zinc oxide to a powdered solid cosmetic containing tranexamic acid in combination with a fatty acid or a salt thereof, odor generation caused by the combination of tranexamic acid and a fatty acid or a salt thereof can be suppressed, thereby completing the present invention.

[0013] That is, the present invention provides a powdered solid cosmetic comprising:

[0014] (A) tranexamic acid or its derivatives or salts thereof,

[0015] (B) fatty acids or their salts, and

[0016] (C) Microparticle zinc oxide.

[0017] Effects of the Invention

[0018] By adopting the above-mentioned configuration, the present invention achieves excellent temporal stability in a powdered solid cosmetic containing tranexamic acid and a fatty acid or a salt thereof. According to the present invention, titanium dioxide surface-treated with a fatty acid or a salt thereof can be incorporated, thereby providing a powdered solid cosmetic that achieves a high UV protection effect without incorporating a large amount of a UV absorber, and exhibits excellent impact resistance and feel during use. DETAILED DESCRIPTION

[0019] The cosmetic of the present invention is characterized by comprising: (A) tranexamic acid or a derivative or salt thereof, (B) a fatty acid or a salt thereof, and (C) fine-particle zinc oxide. The components constituting the powdered solid cosmetic of the present invention are described in detail below.

[0020] <(A) Tranexamic acid or its derivative or salt>

[0021] The (A) tranexamic acid or its derivative or salt thereof (hereinafter sometimes referred to as "component (A)") of the present invention is not particularly limited as long as it is a substance that can be conventionally formulated in cosmetics. Examples of tranexamic acid include trans-4-aminomethylcyclohexane-1-carboxylic acid, and examples of tranexamic acid derivatives include dimers of tranexamic acid (e.g., trans-4-(trans-aminomethylcyclohexanecarbonyl)aminomethylcyclohexanecarboxylic acid hydrochloride, etc.), esters of tranexamic acid (e.g., tranexamic acid cetyl ester), esters of tranexamic acid and hydroquinone (e.g., 4-(trans-aminomethylcyclohexanecarboxylic acid 4'-hydroxyphenyl ester, etc.), esters of tranexamic acid and gentisic acid (e.g., 2-(trans-4-aminomethylcyclohexanecarbonyloxy)-5-hydroxybenzoic acid, etc.). Examples of the salts thereof include tranexamic acid and vitamin esters (e.g., vitamin A ester, vitamin E ester, vitamin C ester, and vitamin D ester), tranexamic acid amides (e.g., trans-4-aminomethylcyclohexanecarboxylic acid amide, trans-4-(p-methoxybenzoyl)aminomethylcyclohexanecarboxylic acid, and trans-4-guanidinomethylcyclohexanecarboxylic acid), and the like. Examples of salts thereof include metal salts such as magnesium salts, calcium salts, sodium salts, and potassium salts; and inorganic salts such as phosphates, hydrochlorides, hydrobromides, and sulfates. Among these, tranexamic acid and tranexamic acid cetyl ester hydrochloride are preferably used.

[0022] The amount of component (A) blended is not particularly limited as long as the intended effect is achieved, but is generally 0.5 to 5.0% by mass, preferably 0.55 to 4.0% by mass, and more preferably 0.6 to 3.0% by mass, relative to the total amount of the cosmetic.

[0023] <(B) Fatty acid or its salt>

[0024] The fatty acid (B) or its salt (hereinafter sometimes referred to as "component (B)") of the present invention is not particularly limited as long as it is a substance that can be conventionally incorporated into cosmetics. In the present invention, a saturated fatty acid having 12 to 22 carbon atoms is preferred. Specific examples include lauric acid, myristic acid, palmitic acid, stearic acid, and behenic acid. Salts of these fatty acids include calcium salts, magnesium salts, and aluminum salts thereof.

[0025] The fatty acid (B) or its salt of the present invention can be used as a surface treatment agent for powders. For example, aluminum salts of myristic acid, aluminum salts of stearic acid, and aluminum salts of behenic acid are commonly used as hydrophobic surface treatment agents for powders. The cosmetic product of the present invention may also contain component (B) as a surface treatment agent for titanium dioxide (D), described below.

[0026] The amount of component (B) incorporated is not particularly limited, as long as it is an amount that causes odor over time when incorporated with tranexamic acid in the cosmetic. The inventors have confirmed that odor occurs when the amount of component (B) incorporated reaches 0.1% by mass or greater relative to the total amount of the cosmetic. Therefore, as an example, the amount of component (B) incorporated can range from 0.1 to 3% by mass relative to the total amount of the cosmetic.

[0027] When component (B) is used as a surface treatment agent for a powder and incorporated into a cosmetic, the ingredients of the cosmetic may be indicated as the total amount of component (B) and the powder relative to the total amount of the cosmetic. For example, the total amount of component (B) and the powder is preferably 1.5 to 15% by mass, more preferably 2 to 10% by mass, relative to the total amount of the cosmetic. If the total amount of component (B) and the powder exceeds 15% by mass, the deodorization-inhibiting effect may be reduced.

[0028] In the present invention, component (B) may be added as a hydrophobic surface treatment agent for titanium dioxide (D) described later. In Examples 1 to 7 and Comparative Examples 1 to 6 of this application, which contain component (B) as a surface treatment agent for component (D), the total amount of component (B) and component (D) is expressed.

[0029] <(C) Micronized zinc oxide>

[0030] The (C) fine-particle zinc oxide of the present invention (hereinafter sometimes referred to as "component (C)") can be used without particular limitation as long as it is a substance commonly incorporated in cosmetics, including untreated zinc oxide and zinc oxide with a hydrophobic surface treatment.

[0031] Examples of substances used for the hydrophobic treatment of the fine-particle zinc oxide (C) include silicones such as methyl hydrogen polysiloxane, dimethyl polysiloxane, and alkyl-modified silicone resins, dextrin fatty acid esters, higher fatty acids, fatty acid esters, metal soaps, amino acids, alkyl phosphate ethers, alkyl ether phosphates, and fluorine compounds. Among them, dextrin fatty acid esters such as dextrin palmitate and higher fatty acids such as isostearic acid are preferably used.

[0032] (C) The average particle size of the fine-particle zinc oxide is preferably 100 nm or less, more preferably 10 to 100 nm. The average particle size is a value measured by the number average diameter method through image analysis of transmission electron micrographs.

[0033] The amount of component (C) is preferably 0.5 to 10% by mass, more preferably 1 to 7% by mass, relative to the total amount of the cosmetic. If it is less than 0.5% by mass, the deodorization suppressing effect may not be sufficiently achieved, while if it exceeds 10% by mass, the feel may be deteriorated, such as a feeling of astringency during application.

[0034] From the viewpoint of simultaneously imparting a dry feel after application and high UV protection, the powdered solid cosmetic of the present invention may further contain (D) titanium dioxide in addition to the aforementioned components (A) to (C).

[0035] The titanium dioxide (D) of the present invention (hereinafter sometimes referred to as "component (D)") can be used without particular limitation as long as it is a substance commonly incorporated in cosmetics, including untreated titanium dioxide and titanium dioxide with a hydrophobic surface treatment.

[0036] The size of the titanium dioxide (D) is not particularly limited and may be pigment grade, microparticles, or the like. "Pigment grade" refers to particles with an average particle size of 200 to 400 nm, while "microparticles" refers to particles with an average particle size of 100 nm or less, specifically 10 to 100 nm. The average particle size herein is the value measured by the number average diameter method using image analysis of transmission electron micrographs.

[0037] The powdered solid cosmetic of the present invention preferably uses fine-particle titanium dioxide having a hydrophobic surface and an average particle size of 100 nm or less, preferably 5 to 50 nm.

[0038] The titanium dioxide (D) of the present invention may be subjected to a hydrophobic treatment using a surface treatment agent containing the aforementioned (B) fatty acid or a salt thereof.

[0039] The powdered solid cosmetic of the present invention may contain, in addition to the titanium dioxide (D) hydrophobized by a surface treatment agent containing the aforementioned fatty acid or a salt thereof (B), titanium dioxide (D) hydrophobized by an arbitrary surface treatment agent other than the component (B).

[0040] As substances other than the aforementioned (B) fatty acid or its salt used for the hydrophobic treatment of (D) titanium dioxide, silicones such as methyl hydrogen polysiloxane, dimethyl polysiloxane, and alkyl-modified silicone resins, dextrin fatty acid esters, higher fatty acids other than the aforementioned (B) component, fatty acid esters, metal soaps other than the aforementioned (B) component, amino acids, alkyl phosphate ethers, alkyl ether phosphates, fluorine compounds, etc. can be mentioned.

[0041] From the perspective of improving the UV protection effect and feel during use, the amount of component (D) is preferably 0.5 to 15% by mass, more preferably 2 to 10% by mass, relative to the total amount of the cosmetic. If it is less than 0.5% by mass, it may be difficult to achieve an improved feel during use and sufficient UV protection. If it exceeds 15% by mass, the odor suppression effect may be reduced when component (D) is surface-treated with component (B).

[0042] As the cause of the smell of the powdered solid cosmetics of the present invention, it is believed that the amino group of tranexamic acid reacts with fatty acids, and the deterioration odor of fatty acids increases due to light irradiation, resulting in smell. On the other hand, in emulsified cosmetics, even if tranexamic acid and fatty acids coexist, they are not easily affected by light irradiation due to the presence of emulsified particles. Therefore, the smell of powdered solid cosmetics will be more obvious than that of emulsified cosmetics. In addition, in addition to tranexamic acid, the smell confirmed this time will also occur in powdered solid cosmetics that use an amino acid derivative having an amino group in combination with a fatty acid or its salt. In this case, the smell can also be suppressed by zinc oxide. In this specification, "smelling" refers to the unpleasant odor in odor, especially the unpleasant deterioration odor of fatty acids.

[0043] Powdered solid cosmetics often use fatty acids or their salts as a hydrophobicizing agent for the powder surface. To achieve high UV protection, the use of ultraviolet scattering agents, such as microparticles of titanium dioxide, is preferred. However, microparticles of titanium dioxide have a larger surface area than pigment-grade titanium dioxide. Therefore, when such microparticles of titanium dioxide are hydrophobized using a surface treatment agent containing fatty acids or their salts, their contact with tranexamic acid increases, leading to more pronounced odor. Therefore, the present invention is particularly useful in formulating powdered solid cosmetics containing tranexamic acid with microparticles of titanium dioxide hydrophobized using a surface treatment agent containing fatty acids or their salts.

[0044] In addition to the aforementioned components (A) to (D), the cosmetics of the present invention may also contain other cosmetic ingredients commonly used in powdered or solid cosmetics. Examples of these other cosmetic ingredients include powders other than the aforementioned components (C) and (D), oily ingredients, surfactants, moisturizers, thickeners, flavorings, antioxidants, and various pharmaceutical agents.

[0045] Specific examples of powders other than the aforementioned components (C) and (D) include: organic pigments (e.g., Red No. 104, Red No. 202, Red No. 226, Yellow No. 4, Yellow No. 5, Blue No. 1, Black No. 401, etc.); lake pigments (e.g., Yellow No. 4 aluminum lake, Blue No. 1 aluminum lake, etc.); inorganic coloring pigments (e.g., iron oxide yellow, iron oxide red (red iron), iron oxide black, chromium oxide, chromium hydroxide, carbon black, ultramarine, Prussian blue, manganese violet, etc.); extender pigments (e.g., yellow iron oxide, red iron oxide (red iron), black iron oxide, chromium oxide, chromium hydroxide, carbon black, ultramarine, Prussian blue, manganese violet, etc.); For example, talc, mica, sericite, kaolin, etc.); other inorganic pigments (for example, barium sulfate, calcium carbonate, magnesium carbonate, aluminum silicate, magnesium silicate, silica, aluminum oxide, boron nitride, synthetic phlogopite, etc.); spherical resin powders (for example, polyethylene powder, polypropylene powder, polymethyl methacrylate powder, nylon powder, polytetrafluoroethylene powder, silicone powder (for example, vinyl polydimethylsiloxane / polymethylsiloxane silsesquioxane cross-linked polymer, etc.), silicone rubber powder, silk powder, polyurethane powder, cellulose powder, polyvinyl fluoride, etc.); metal soap powder, etc.

[0046] The size, shape, etc. of these powders are not particularly limited and can be used alone or in combination of two or more. In addition, these powders can also be appropriately hydrophobized on the surface. As hydrophobized surface treating agents, the hydrophobized surface treating agents described for the aforementioned (C) fine zinc oxide and (D) titanium dioxide can be cited.

[0047] The oily component is not particularly limited as long as it is an ingredient that can be used in general cosmetics, and examples thereof include: linseed oil, camellia seed oil, macadamia nut oil, corn oil, mink oil, olive oil, avocado oil, camellia oil, castor oil, safflower seed oil, jojoba seed oil, sunflower seed oil, almond oil, rapeseed oil, sesame seed oil, soybean oil, peanut oil, triglycerol, triethylhexanoin, glyceryl triisopalmitate and other liquid oils; cocoa seed butter, coconut oil, hydrogenated coconut oil, oil Palm oil, sumac kernel oil, hydrogenated castor oil, horse fat and other solid oils; beeswax, candelilla wax, carnauba wax, bran wax, lanolin, jojoba wax, hard lanolin, POE cholesterol ether and other waxes; liquid paraffin, squalane, squalene, paraffin, isoparaffin, pure wax and other hydrocarbon oils; isostearic acid, linoleic acid, linolenic acid, eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA) and other higher fatty acids other than the above-mentioned (B) component; straight-chain alcohols (for example, lauryl alcohol, cetyl alcohol, stearyl alcohol, methyl paraffin, methyl dapoxetine ... higher alcohols such as stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, cetearyl alcohol, etc.); branched alcohols (e.g., monostearyl glyceryl ether (batyl alcohol), 2-decyltetradecyl alcohol, lanolin alcohol, cholesterol, phytosterol, hexyldodecanol, isostearyl alcohol, octyldodecanol, etc.); cetyl ethylhexanoate, triethylhexanoin, cetyl ethylhexanoate, hexyl laurate, isopropyl myristate, ethylhexyl palmitate, isocetyl stearate, isopropyl isostearate, ethylhexyl isopalmitate, oil Ester oils such as isodecyl succinate, tri-2-ethylhexanoin, pentaerythritol tetra(ethylhexanoate), diethylhexyl succinate, and diethyl sebacate; silicone oils such as chain silicones such as dimethylpolysiloxane, methylphenylpolysiloxane, and methylhydrogenpolysiloxane, and cyclic silicones such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane; oily UV absorbers that are liquid at room temperature such as ethylhexyl methoxycinnamate; oily agents that are liquid at room temperature such as tocopherol (vitamin E), etc.

[0048] The method for producing the powdered solid cosmetic of the present invention is not particularly limited, and a known method can be used. For example, a "dry method" can be used, in which a powder component and an oily component are mixed without using a solvent, filled into a container, and formed by compression or the like; a "wet method" can be used, in which a powder component and an oily component are added to a volatile dispersion medium to form a slurry, the slurry is filled into a container, the solvent is removed, and solidified by compression or the like; a manufacturing method (W&D method) in which the slurry is formed into fine droplets using mechanical shear force, a dry gas is blown into the fine droplets to dry them, and the obtained dry powder is subjected to conventional dry molding. The details of the W&D method are described, for example, in Japanese Patent Application Laid-Open No. 2007-55990. Through the W&D method, it can be expected that the usability of the powder, such as its pick-up property, smoothness, and fit, can be further improved.

[0049] The solvent used to prepare the slurry in the wet process or the W&D process is not particularly limited, but includes purified water, cyclic silicones, light liquid isoparaffins, lower alcohols, ethers, LPG, fluorocarbons, N-methylpyrrolidone, fluoroalcohols, and volatile linear silicones. Representative lower alcohols include ethanol and isopropyl alcohol. These solvents may be used alone or in combination of two or more, depending on the characteristics of the ingredients used.

[0050] The powdered solid cosmetics of the present invention may be in any of the powder cosmetic categories, specifically foundation, eye shadow, blush, body powder, loose powder, baby powder, pressed powder, deodorant powder, and scented powder.

[0051] Example

[0052] The present invention is further described in detail below with reference to the following examples, but the present invention is not limited to these embodiments. Unless otherwise specified, the amount of each ingredient is expressed as % by mass relative to the total cosmetic amount. Before describing each example in detail, the evaluation methods employed are described.

[0053] <Stability after light irradiation>

[0054] Powdered solid cosmetics were placed in a cosmetics compact and exposed to sunlight for 10 days. After exposure, the odor was evaluated according to the following evaluation criteria.

[0055] (Evaluation Criteria)

[0056] A: The smell has not changed at all.

[0057] B: It smells a little bit.

[0058] C: It feels smelly.

[0059] D: I feel a strong odor.

[0060] Impact resistance

[0061] Powdered solid cosmetics were placed in a cosmetics compact and dropped onto a metal plate from a height of 50 cm, cosmetic surface downward. The number of times the cosmetics broke was measured. The impact resistance of each cosmetic was evaluated based on the number of drops until it broke, according to the following evaluation criteria.

[0062] (Evaluation Criteria)

[0063] A: It was broken after being dropped more than 6 times.

[0064] B: Broken after being dropped 4-5 times.

[0065] C: Broken after being dropped 2-3 times.

[0066] D: Broken after being dropped once.

[0067] Usability

[0068] Ten professional evaluation panelists applied the prepared powdered solid cosmetics on the skin and evaluated the dry feel (dry feel) after application according to the following evaluation criteria.

[0069] (Evaluation Criteria)

[0070] A: More than 9 out of 10 panelists answered that it feels dry and refreshing.

[0071] B: 6 or more and less than 9 out of 10 panelists answered that the feeling was dry and refreshing.

[0072] C: 4 or more and less than 6 out of 10 panelists answered that the feeling was dry and refreshing.

[0073] D: Less than 4 out of 10 panelists answered that it felt dry and refreshing.

[0074] <UV protection effect>

[0075] The cosmetics (samples) of each example were placed at 2 mg / cm 2 The amount of the solution was applied to a measurement plate (S plate) (5×5 cm V-groove PMMA plate, SPF MASTER-PA01), and the SPF value was measured using SPF MASTER (registered trademark) (manufactured by Shiseido Irica Technology Co., Ltd.).

[0076] (Evaluation Criteria)

[0077] A: Equivalent to SPF35 or above

[0078] B: Equivalent to SPF25-30

[0079] D: Equivalent to SPF15-20

[0080] D: Equivalent to SPF10 or below

[0081] <Comparative Examples 1 to 7 and Examples 1 to 8>

[0082] The powdered solid cosmetics listed in the comparative examples in Table 1 and the examples in Table 2 were prepared using a dry process. Specifically, the powdered ingredients listed in the formulations were mixed using a stirring mixer such as a Henschel mixer, and then the oily ingredients were added and uniformly mixed. The mixture was then pulverized using a pulper or other pulverizer, and then filled into a container. The mixture was then formed using dry pressing.

[0083] The obtained powdered solid cosmetics were evaluated for the above-mentioned items and their UV protection effects were measured. The evaluation results are shown in Tables 1 and 2.

[0084] [Table 1]

[0085]

[0086] [Table 2]

[0087]

[0088] Comparative Examples 1, 5, and 6 and Examples 1 to 7 are examples in which the component (B) of the present invention is used as a surface treatment agent for (D) titanium dioxide and is incorporated into cosmetics.

[0089] No odor was observed in the cosmetic of Comparative Example 1 that did not contain (A) tranexamic acid, a derivative thereof, or a salt thereof, or in the cosmetics of Comparative Examples 2 and 3 that did not contain (B) fatty acid or a salt thereof.

[0090] When a UV absorber (ethylhexyl methoxycinnamate) was added to a powdered solid cosmetic containing tranexamic acid in an attempt to improve the UV protection effect (SPF value), the impact resistance and the dry feeling after application were poor (Comparative Example 4).

[0091] The cosmetics of Comparative Examples 5 and 7, which did not contain the zinc oxide (C) of the present invention, all experienced odor induced by tranexamic acid and fatty acids, regardless of whether the component (B) was used as a surface treatment agent.

[0092] Sodium metabisulfite is known to inhibit discoloration and odor caused by fatty acids (Japanese Patent Application Publication No. 2012-36118). However, sodium metabisulfite was unable to inhibit the odor caused by the combined use of tranexamic acid and fatty acids observed during this research (Comparative Example 6).

[0093] On the other hand, comparisons between Comparative Example 5 and Examples 1 to 7, and between Comparative Example 7 and Example 8, show that the addition of the component (C) of the present invention suppresses the deodorization caused by tranexamic acid and fatty acids.

[0094] According to the comparison between Examples 1 to 6 and Example 7, the use of hydrophobized zinc oxide can provide a higher ultraviolet protection capability than that of untreated zinc oxide.

[0095] In addition, according to the comparison between Example 3 and Comparative Example 3, the use of hydrophobized zinc oxide and hydrophobized titanium dioxide improves the dry feeling after application to the skin and the UV protection effect.

Claims

1. A powder solid cosmetic comprising: (A) tranexamic acid or its derivatives or salts thereof, (B) fatty acids or their salts, and (C) Microparticle zinc oxide.

2. The powdered solid cosmetic according to claim 1, wherein: The component (C) is fine-particle zinc oxide having an average particle size of 100 nm or less.

3. The powdered solid cosmetic according to claim 1, further comprising (D) fine-particle titanium dioxide having an average particle size of 100 nm or less.

4. The powdered solid cosmetic according to claim 3, wherein: The component (D) is obtained by subjecting the component (B) to a hydrophobic treatment using a surface treatment agent.

5. The powdered solid cosmetic according to claim 1, wherein: The component (B) is a saturated fatty acid having 12 to 22 carbon atoms.

6. The powdered solid cosmetic according to claim 1, wherein: The amount of the component (C) is 0.5 to 10% by mass based on the total amount of the cosmetic.

7. The powdered solid cosmetic according to claim 3, wherein: The amount of the component (D) is 0.5 to 15% by mass based on the total amount of the cosmetic.

8. The powdered solid cosmetic according to claim 1, wherein: The component (C) is hydrophobized using a surface treatment agent containing a dextrin fatty acid ester.

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