Water-in-oil emulsion cosmetic

Abstract

The purpose of the present invention is to provide a water-in-oil type emulsion cosmetic which, despite containing tranexamic acid, has little stickiness, excellent workability such as fit and smoothness, and excellent gloss and uniformity of makeup. A water-in-oil type emulsion cosmetic according to the present invention is characterized by containing (A) tranexamic acid, (B) 3-9 mass% of hydrophobized mica, and (C) an organic modified clay mineral.

Description

Technical Field

[0001] The present invention relates to a water-in-oil emulsified cosmetic that has excellent usability and good makeup appearance despite containing tranexamic acid that easily causes stickiness. Background Art

[0002] Stimulation by ultraviolet rays from sunlight promotes the production of melanin in the skin, and when it abnormally accumulates in the skin, it causes spots and freckles. To prevent such spots / freckles caused by sunburn, tranexamic acid has been widely used as a whitening agent.

[0003] However, tranexamic acid easily causes a sticky feeling. When incorporated into cosmetics, not only does the smoothness and fit (moderate spreadability) during application deteriorate, but there are also problems such as poor gloss and uniformity of the makeup appearance. Moreover, such problems tend to be particularly significant in oil-in-water emulsified cosmetics rich in oil. That is, compared with aqueous or water-in-oil emulsified cosmetics, oil-in-water emulsified cosmetics have excellent advantages such as smoothness, moistness, and long-lasting makeup, but lack a refreshing feeling and often cause a sticky and greasy feeling during use. Therefore, if tranexamic acid is incorporated into oil-in-water emulsified cosmetics, the stickiness becomes more significant, and there is a tendency for the usability to deteriorate significantly. Therefore, cosmetics containing tranexamic acid are usually of a type with an aqueous component as the continuous phase and relatively less oil, such as aqueous cosmetics as disclosed in Patent Document 1 or water-in-oil emulsified cosmetics as described in Patent Documents 2 and 3.

[0004] On the other hand, although there are few proposals for oil-in-water emulsified cosmetics containing tranexamic acid. For example, Patent Document 4 discloses an oil-in-water emulsified composition containing tranexamic acid, a specific polyoxyalkylene-modified silicone, and a specific linear silicone, and it is considered that this composition does not feel sticky and can give a moist feeling during use.

[0005] However, it still cannot be said that the suppression of stickiness has reached a sufficient level, and further improvement is required in terms of usability and makeup appearance.

[0006] Prior Art Documents

[0007] Patent Documents

[0008] Patent Document 1: Japanese Patent Application Laid-Open No. 2021-161077

[0009] Patent Document 2: Japanese Patent Application Laid-Open No. 2019-178125

[0010] Patent Document 3: Japanese Patent Application Laid-Open No. 2022-063613

[0011] Patent Document 4: Japanese Patent Application Laid-Open No. 2020-083763 Summary of the Invention

[0012] Problems to be Solved by the Invention

[0013] The present invention has been completed in view of the above actual situation, and an object thereof is to provide a water-in-oil emulsion cosmetic that contains tranexamic acid, has little stickiness, and has excellent usability and makeup effects.

[0014] Solutions to the Problems

[0015] The inventors of the present invention conducted in-depth research to solve the above problems, and as a result, found that by blending a specified amount of hydrophobized mica and organically modified clay minerals in a water-in-oil emulsion cosmetic containing tranexamic acid, the above problems can be solved, and thus the present invention was completed.

[0016] That is, the gist of the present invention is to provide a water-in-oil emulsion cosmetic containing (A) tranexamic acid, (B) 3 to 9% by mass of hydrophobized mica, and (C) organically modified clay minerals.

[0017] Effects of the Invention

[0018] By adopting the above configuration, the water-in-oil emulsion cosmetic of the present invention can provide a water-in-oil emulsion cosmetic that can suppress the stickiness resulting from the blending of tranexamic acid, has excellent usability such as fit and smoothness, and achieves sufficient gloss and uniform makeup.

[0019] In addition, by blending tranexamic acid, it has the effects of whitening the skin and improving skin roughness, and in addition, by blending hydrophobized mica, it also has excellent effects of covering uneven skin color / unevenness, etc. Detailed Description of the Invention

[0020] The water-in-oil emulsion cosmetic of the present invention is characterized by containing (A) tranexamic acid, (B) hydrophobized mica, and (C) organically modified clay minerals. Hereinafter, each component constituting the water-in-oil emulsion cosmetic of the present invention will be described in detail.

[0021] <(A) Tranexamic Acid>

[0022] The (A) tranexamic acid in the present invention includes tranexamic acid (trans-4-aminomethylcyclohexane-1-carboxylic acid) and its derivatives or salts.

[0023] Examples of derivatives of tranexamic acid include esters, amides, etc. Examples of esters of tranexamic acid include lauryl tranexamate, cetyl tranexamate, cetyldecyl tranexamate, etc., and examples of amides of tranexamic acid include methyl tranexamate, etc.

[0024] Examples of salts of tranexamic acid or its derivatives include alkali metal salts such as sodium salt and potassium salt; alkaline earth metal salts such as calcium salt and magnesium salt; zinc salt; iron salt; ammonium salt; salts with basic amino acids such as arginine, histidine, lysine, and ornithine; salts with amines such as monoethanolamine, diethanolamine, and triethanolamine, etc.

[0025] The blending amount of (A) tranexamic acid in the water-in-oil emulsion cosmetic of the present invention is preferably 0.1% by mass or more, more preferably 2% by mass or more, based on the total amount of the cosmetic. Additionally, it is preferably 5% by mass or less, more preferably 3% by mass or less. Therefore, as the blending amount range, 0.1% by mass to 5% by mass, 2% by mass to 3% by mass, etc. can be cited. If it is within this range, it is easy to exhibit the skin whitening effect and the skin roughness improving effect of tranexamic acid. On the other hand, it is also not easy to cause a reduction in usability due to stickiness.

[0026] <(B) Hydrophobically Treated Mica>

[0027] The mica used in (B) hydrophobically treated mica can be either natural or synthetic, and examples include muscovite, biotite, phlogopite, synthetic mica, etc.

[0028] Examples of the hydrophobization treatment of the mica surface include treatment with dialkyldimethylammonium salts such as distearyldimethylammonium chloride, silicone treatment with methylpolysiloxane, methylhydrogenpolysiloxane, triethoxysilylethylpolydimethylsiloxane, etc., amino-modified silicone treatment with aminoterminated polydimethylsiloxane, aminopropyltriethoxysilane, etc., fatty acid treatment with stearic acid, etc., metal soap treatment with magnesium stearate, aluminum stearate, magnesium myristate, etc., dextrin fatty acid ester treatment with dextrin palmitate, etc., silane coupling treatment with octyltriethoxysilane, etc., fluorine compound treatment with perfluorohexylethyltriethoxysilane, etc., amino acid treatment with N-acylglutamic acid, etc., and one or more of them can be used. Among them, one or more selected from the group consisting of distearyldimethylammonium chloride, aminoterminated polydimethylsiloxane, magnesium stearate, and triethoxysilylethylpolydimethylsiloxane are particularly preferred. The treatment method is not particularly limited, and the treatment can be carried out using a method known for each treatment agent.

[0029] The average primary particle size of (B) hydrophobically treated mica is usually preferably 30 μm or less, more preferably 20 μm or less. Additionally, it is preferably 1 μm or more, more preferably 5 μm or more. The average primary particle size is measured by conventional methods such as the number average diameter based on image analysis of electron microscope photographs, for example.

[0030] In the water-in-oil emulsion cosmetic of the present invention, the compounding amount of (B) hydrophobized mica is 3% by mass or more, more preferably 5% by mass or more, and further, 9% by mass or less, more preferably 7% by mass or less, based on the total amount of the cosmetic. Therefore, as the compounding amount range, 3% by mass to 9% by mass, 5% by mass to 7% by mass, etc. can be cited. If it is within this range, in addition to being able to sufficiently suppress the stickiness caused by the compounding of tranexamic acid, it can also sufficiently exhibit the effect of covering skin color unevenness, unevenness, etc.

[0031] <(C) Organically modified clay mineral>

[0032] (C) The organically modified clay mineral is a kind of colloidal hydrous aluminum silicate having a three-layer structure, and is obtained by modifying the clay mineral represented by the following general formula (I) with a quaternary ammonium salt type cationic surfactant.

[0033] (X,Y) 2-3 (Si,Al) 4 O 10 (OH) 2 Z 1 / 3 ·nH 2 O(I)

[0034] (wherein, X = Al, Fe(III), Mn(III), Cr(III), Y = Mg, Fe(II), Ni, Zn, Li, Z = K, Na, Ca)

[0035] As specific examples of (C) the organically modified clay mineral, dimethyldistearylammonium lithium montmorillonite (dimethyldistearylammonium lithium montmorillonite), dimethylalkylammonium lithium montmorillonite, benzyldimethyldistearylammonium lithium montmorillonite, dimethyldistearylammonium chloride-treated magnesium aluminum silicate, etc. can be cited. Among them, dimethyldistearylammonium lithium montmorillonite is particularly preferred.

[0036] As commercially available products, Bentone 27 (lithium montmorillonite treated with benzyldimethyldistearylammonium chloride, manufactured by Elementis Japan Co., Ltd.) and Bentone 38 (lithium montmorillonite treated with dimethyldistearylammonium chloride, manufactured by Elementis Japan Co., Ltd.) can be cited.

[0037] In the water-in-oil emulsion cosmetic of the present invention, the compounding amount of (C) the organically modified clay mineral is 0.1% by mass or more, more preferably 0.5% by mass or more, and further, 5% by mass or less, more preferably 2% by mass or less, based on the total amount of the cosmetic. Therefore, as the compounding amount range, 0.1% by mass to 5% by mass, 0.5% by mass to 2% by mass, etc. can be cited. If it is within this range, it can suppress the stickiness caused by tranexamic acid and achieve excellent smoothness and fit.

[0038] <Optional ingredient>

[0039] In the water-in-oil emulsion cosmetic of the present invention, in addition to the above components (A) to (C), components commonly used in cosmetics, such as oily components, ultraviolet ray protectants, surfactants, polyhydric alcohols, powder components, etc., can be appropriately blended as needed.

[0040] Examples of the oily component include camellia seed oil, macadamia (MACADAMIA INTEGRIFOLIA) seed oil, olive (OLEAE EUROPAEA) fruit oil, castor oil, safflower oil, soybean oil, tea seed oil, cocoa butter, coconut oil, hydrogenated coconut oil, oil palm (ELAEIS GUINEENSIS) oil, Japanese lacquer (RHUS SUCCEDANEA) fruit wax, hydrogenated castor oil, beeswax, candelilla wax, carnauba wax, lanolin, lanolin oil, jojoba wax, anhydrous lanolin, polyoxyethylene lanolin alcohol ether, polyoxyethylene cholesteryl ether and other oils and fats; liquid paraffin, ozokerite, squalene, paraffin, ceresin, petrolatum, microcrystalline wax and other hydrocarbon oils; isopropyl myristate, octyldodecyl myristate, isopropyl palmitate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, pentaerythritol tetra-2-ethylhexanoate, glyceryl tri-2-ethylhexanoate, trimethylolpropane triisostearate, cetyl alcohol ethylhexanoate, methyl ricinoleate and other synthetic oily components; linear polysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane; cyclic polysiloxanes such as decamethylpolysiloxane, dodecamethylpolysiloxane, tetramethyltetrahydrocyclosiloxane.

[0041] As the ultraviolet ray protectant, ultraviolet absorbers and ultraviolet scatterers commonly used in cosmetics can be used. Examples of the ultraviolet absorber include ethylhexyl methoxycinnamate, octocrylene, poly dimethylsiloxane diethylhexyl benzylidenemalonate, polysiloxane-15, tert-butyl methoxydibenzoylmethane, ethylhexyl triazone, diethylamino hydroxybenzoyl hexyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, benzophenone-3, methylene bis-benzotriazolyl tetramethylbutylphenol, phenylbenzimidazole sulfonic acid, homosalate, ethylhexyl salicylate, etc. In addition, as the ultraviolet scatterer, particulate metal oxides such as zinc oxide, titanium dioxide, iron oxides, cerium oxide, tungsten oxide, or substances obtained by subjecting them to a hydrophobized surface treatment can be cited.

[0042] In order to achieve a water-in-oil emulsion form, there is no particular limitation on the surfactant as long as it has an HLB value less than 8, and a silicone-based surfactant is particularly preferred. Examples of such silicone-based surfactants include polyoxyalkylene-modified silicone, polyoxyalkylene / alkyl co-modified silicone, polyglycerol-modified silicone, and / or polyglycerol / alkyl co-modified silicone.

[0043] Examples of the polyol include ethylene glycol, propylene glycol, dipropylene glycol, 1,3-butanediol, glycerol, erythritol, trimethylolpropane, pentaerythritol, sorbitol, maltitol, diglycerol, polyethylene glycol, and the like.

[0044] Examples of the powder component include inorganic powders such as talc, kaolin, magnesium carbonate, calcium carbonate, aluminum silicate, silica, zeolite, barium sulfate, calcined calcium sulfate (gypsum), calcium phosphate, fluorapatite, hydroxyapatite, ceramic powder, metal soaps (zinc myristate, calcium palmitate, aluminum stearate, etc.), boron nitride, etc.; organic powders such as polyamide resin powder (nylon powder), polyethylene powder, polymethyl methacrylate powder, polystyrene powder, copolymer resin powder of styrene and acrylic acid, polymethylsilsesquioxane powder, cellulose powder, etc.; inorganic pigments such as titanium dioxide, iron oxide (iron oxide red), iron titanate, iron oxide yellow, iron oxide black, carbon black, lower titanium oxide, manganese violet, cobalt violet, chromium oxide, ultramarine, Prussian blue, etc.; pearlescent pigments such as titanium dioxide-coated mica, titanium dioxide-coated bismuth oxychloride, colored titanium dioxide-coated mica, bismuth oxychloride, fish scale foil, etc.; metal powder pigments such as aluminum powder; zirconium lakes such as Red No. 201, Red No. 202, Orange No. 203, Yellow No. 205, Yellow No. 401, Blue No. 404, Red No. 3, Yellow No. 4, Green No. 3, Blue No. 1, etc.; organic pigments such as barium lakes, aluminum lakes, etc.; natural pigments such as chlorophyll, β-carotene, etc.

[0045] The water-in-oil emulsion cosmetic of the present invention can be made into a low-viscosity product form such as an emulsion or a lotion. For example, it is preferably provided as a skin care lotion having effects such as whitening effect, skin texture improvement effect, skin correction effect, sunscreen effect, and the like.

[0046] Examples

[0047] Examples are listed below to further elaborate the present invention, but the present invention is not limited by any of these examples. Unless otherwise specified, the blending amounts are expressed in mass % based on the water-in-oil emulsion cosmetic. Before specifically describing each example, the evaluation method used is described.

[0048] <Usability>

[0049] Regarding (1) non-stickiness and (2) smoothness when applied to the skin, professional reviewers actually used the prepared cosmetics and evaluated them on a 5-point scale.

[0050] A+: Extremely excellent

[0051] A: Excellent

[0052] B: Slightly poor

[0053] C: Poor

[0054] D: Significantly poor

[0055] Regarding (3) conformability when applied to the skin, professional reviewers actually used the prepared cosmetics and evaluated them on a 3-point scale.

[0056] A+: Extremely excellent

[0057] A: Excellent

[0058] B: Poor

[0059] <Makeup>

[0060] Regarding (4) glossiness and (5) uniformity after application to the skin, professional reviewers actually used the prepared cosmetics and evaluated them on a 5-point scale.

[0061] A+: Extremely excellent

[0062] A: Excellent

[0063] B: Slightly poor

[0064] C: Poor

[0065] D: Significantly poor

[0066] <Examples 1 to 4 and Comparative Examples 1 to 5>

[0067] Prepare a water-in-oil emulsion cosmetic having the composition described in Table 1 below, and evaluate its usability and makeup.

[0068] [Table 1]

[0069]

[0070] 1 Hydrophobically treated mica obtained by treating the surface of synthetic phlogopite with distearyldimethylammonium chloride

[0071] 2 Hydrophobically treated mica obtained by treating the surface of synthetic phlogopite with amino-terminated polydimethylsiloxane

[0072] 3 Hydrophobically treated mica obtained by treating the surface of synthetic phlogopite with magnesium stearate

[0073] Hydrophobically treated mica obtained by treating the surface of 4 pairs of synthetic phlogopite with triethoxysilylethyl polydimethylsiloxylethyl polydimethylsiloxane

[0074] Hydrophobically treated talc obtained by treating the surface of 5 pairs of talc with polydimethylsiloxane

[0075] Hydrophobically treated silica obtained by treating the surface of 6 pairs of silica with polydimethylsiloxane

[0076] As shown in Table 1 above, in the case of not blending (A) tranexamic acid, no particular problems were confirmed regarding usability and makeup (reference example). However, when (A) tranexamic acid was blended, a significant stickiness occurred, the smoothness of coating was impaired, and the uniformity of makeup was also insufficient (comparative example 1). In addition, even when untreated mica (synthetic phlogopite), hydrophobically treated talc, and hydrophobically treated silica were blended, the deterioration of usability and makeup caused by the blending of (A) tranexamic acid was not improved (comparative examples 2 to 4). On the other hand, when (B) hydrophobically treated mica was blended, the stickiness was significantly improved, and excellent results were also shown in all other evaluation items (Examples 1 to 4).

[0077] In addition, it was confirmed that in the case of not blending (C) organically modified clay mineral, the usability such as stickiness, fit, and smoothness was poor (comparative example 5).

[0078] <Examples 5 to 10 and Comparative Examples 6 to 8>

[0079] An oil-in-water type emulsified cosmetic having the composition described in Table 2 below was prepared, and the usability and makeup were evaluated.

[0080] [Table 2]

[0081]

[0082] As shown in Table 2 above, when the blending amount of (B) hydrophobically treated mica was less than 3% by mass, the stickiness caused by the blending of (A) tranexamic acid could not be sufficiently suppressed (comparative examples 6 to 7). In addition, it was confirmed that even when the blending amount of (B) hydrophobically treated mica exceeded 9% by mass, the stickiness could not be suppressed (comparative example 8).

[0083] On the other hand, when (B) hydrophobically treated mica was blended in the range of 3 to 9% by mass, excellent effects were shown in all evaluation items (Examples 5 to 10).

Claims

1. A water-in-oil emulsified cosmetic containing (A) tranexamic acid, (B) hydrophobized mica in an amount of 3 to 9% by mass, and (C) an organically modified clay mineral.

2. The water-in-oil emulsified cosmetic according to claim 1, wherein (B) the surface treatment agent of the hydrophobized mica is at least one selected from the group consisting of distearyldimethylammonium chloride, amino-terminated polydimethylsiloxane, magnesium stearate, and triethoxysilylethyl polydimethylsiloxylethyl polydimethylsiloxane.

3. The water-in-oil emulsified cosmetic according to claim 1, wherein (C) the organically modified clay mineral is dimethyldistearylammonium lithium montmorillonite.

4. The water-in-oil emulsified cosmetic according to claim 1, further comprising an ultraviolet light protectant.

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