Oil-based solid cosmetics

Abstract

To provide a novel oily solid cosmetic that does not cause makeup fading even under a high-humidity environment such as when wearing a mask, and does not cause deterioration in cosmetic properties such as pore-masking effect.SOLUTION: An oily solid cosmetic contains water-absorbing polymer (A), oil component (B), and oil gelling agent and / or wax (C), where the oil component (B) contains 3 to 45 mass% of volatile oil component (b1) with respect to the total amount of cosmetic.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an oil-based solid cosmetic preparation, and more particularly to an oil-based cosmetic preparation that does not come off even under high humidity conditions and that actually improves the effect of concealing pores. [Background technology]

[0002] Makeup cosmetics can become "smudged" due to sweat, sebum, or the external environment. This tendency is particularly pronounced in high-humidity environments. As makeup becomes smudged, the expected properties of the cosmetics, such as pore-concealing properties, often decrease. Oil-based cosmetics generally have excellent water resistance (water repellency), but prolonged exposure to high-humidity environments inevitably leads to a certain degree of deterioration in their cosmetic properties.

[0003] Conventionally, in order to prevent makeup from coming off, for example, a makeup-preventing lotion that is applied on top of makeup cosmetics applied to the skin (Patent Document 1) and a makeup cosmetic that contains a highly water-absorbent polymer compound made of self-crosslinking sodium polyacrylate to prevent makeup from coming off due to sweat (Patent Document 2) have been proposed.

[0004] Recent cosmetics containing the highly water-absorbent polymer compound (water-absorbent polymer) used in Patent Document 2 include emulsion cosmetics that have a fresh feel or a mousse-like texture, which are made by allowing the water-absorbent polymer to retain a relatively large amount of water (Patent Documents 3 and 4). However, no study has been conducted on these cosmetics in terms of makeup breakdown or changes in cosmetic properties in high-humidity environments.

[0005] Not only the high temperature and humidity of the external environment from the rainy season to summer, but also the high humidity caused by wearing a mask for long periods of time can cause makeup to run or become shiny due to sweat and sebum. Therefore, from winter to early spring, when masks are worn more frequently to prevent influenza, colds, and hay fever, and in recent years, when masks are required to be worn at all times to prevent novel coronavirus disease (COVID-19), there is a demand for cosmetics that do not run makeup and maintain their cosmetic properties even in the high humidity environment inside a mask, regardless of the season. For example, the makeup cosmetics described in Patent Document 2 can prevent makeup from running due to sweat, but have the problem of reducing their pore-concealing effect when used in a high humidity environment. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 4-149111 [Patent Document 2] Japanese Patent Application Publication No. 5-72362 [Patent Document 3] WO2018 / 061181 publication [Patent Document 4] Japanese Patent Application Laid-Open No. 2011-256154 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention aims to provide a new oily solid cosmetic that does not come off even in a high humidity environment and does not reduce cosmetic properties such as pore-concealing effect. [Means for solving the problem]

[0008] As a result of extensive research into solving the above-mentioned problems, the present inventors discovered that by blending a water-absorbing polymer into an oil-based solid cosmetic and also blending a predetermined amount of volatile oil as the oil component, the makeup does not come off even in a high humidity environment, and the cosmetic properties such as pore-concealing effect are actually improved, which led to the completion of the present invention.

[0009] That is, the present invention provides: (A) water-absorbing polymer; (B) oil; and (C) Oil gelling agent and / or wax An oily solid cosmetic comprising: The present invention provides an oil-based solid cosmetic, wherein the (B) oil component contains 3 to 45 mass % of (b1) a volatile oil component relative to the total mass of the cosmetic. [Effects of the Invention]

[0010] The cosmetic of the present invention not only prevents makeup from coming off, does not become shiny, and does not lose its pore-concealing effect even in a high-humidity environment, but also has a unique effect that could not be predicted from conventional technology: the above-mentioned effects are actually improved compared to before being placed in a high-humidity environment. DETAILED DESCRIPTION OF THE INVENTION

[0011] (A) Water-absorbent polymer The oil-based solid cosmetic preparation of the present invention (hereinafter also referred to as "cosmetic preparation") contains a water-absorbent polymer (also referred to as "component A") as an essential component. In the present invention, "water-absorbent polymer" refers to a polymer that has a water-absorption capacity of 20 times or more, preferably 100 times or more, and more preferably 200 times or more its own weight.

[0012] Generally, the amount of water absorption (water absorption rate) of a water-absorbent polymer is often specified by the expression "how many times its own weight in water it can absorb" (water absorption ratio) as described above, but in this specification, the "water absorption rate (X)" of a water-absorbent polymer is defined as follows. (1) A predetermined amount of water-absorbing polymer is weighed, and a predetermined amount of water is gradually added while stirring. (2) Use a disperser to mix at 2000 rpm for at least 2 minutes until the mixture is homogenous. (3) Stop stirring and let stand for at least 12 hours. (4) After adjusting to 30°C, the viscosity is measured using a B-type viscometer (VISCOMETER TVB-10: TOKI SANGYO). (5) If the viscosity is less than 4900 mPa·s (30°C), reduce the amount of water added in step (1) and repeat the above steps (1) to (4). If the viscosity exceeds 5100 mPa·s (30°C), increase the amount of water added in step (1) and repeat the above steps (1) to (4). The amount of water added when the viscosity in step (4) falls within the range of 5000±100 mPa·s (30°C) is defined as the water absorption rate (X) of the water-absorbing polymer.

[0013] The water-absorbing polymer preferably used in the cosmetic of the present invention is not particularly limited, but is preferably at least one selected from the group consisting of sodium acrylate grafted starch and acrylates crosspolymer-2-Na.

[0014] Sodium acrylate grafted starch (cosmetic ingredient name) is the sodium salt of starch grafted with acrylic acid (INCI name: Sodium Polyacrylate Starch; water absorption rate = 600-700). The sodium acrylate-grafted starch used in the present invention may be commercially available products, such as MAKIMOUSSE7 (average particle size: approximately 7 μm), MAKIMOUSSE12 (average particle size: approximately 12 μm), MAKIMOUSSE25 (average particle size: approximately 25 μm), and MAKIMOUSSE400 (average particle size: approximately 400 μm) (all manufactured by Daito Chemical Industry Co., Ltd.), and Sanflesh ST-100C, ST100MC, and IM-300MC (all manufactured by Sanyo Chemical Industries, Ltd.).

[0015] The term "sodium acrylate-grafted starch" as used herein also encompasses superabsorbent polymers with a starch backbone and acrylic polymers grafted thereto. Commercially available products of such polymers (labeled as starch / acrylamide / sodium acrylate copolymers) include Water Lock A-240, A-180, B-204, D-223, A-100, C-200, and D-223 (manufactured by Grain Processing).

[0016] Acrylates crosspolymer-2-Na (cosmetic ingredient name) is the sodium salt of a copolymer of acrylic acid, methacrylic acid, or one or more of their simple esters crosslinked with ethylene glycol diglycidyl ether. Acrylates crosspolymer-2-Na (INCI name: Sodium Acrylates Crosspolymer-2) can be a commercially available product. For example, "ARON NT-Z (manufactured by Toagosei Co., Ltd.)" (water absorption rate: 20 to 22%) and "AQUAKEEP 10SH-NFC (manufactured by Sumitomo Seika Chemicals Co., Ltd.)" (water absorption rate: approximately 200 to 300%) are preferably used.

[0017] The blending amount of the water-absorbent polymer (component A) in the cosmetic of the present invention is 0.3 to 20%, preferably 0.5 to 18%, and more preferably 1 to 15%, based on the total amount of the cosmetic.

[0018] (B) Oil content The (B) oil component (also referred to as "component B") in the cosmetic of the present invention necessarily contains (b1) a volatile oil component. In the present invention, "volatile oil component" refers to an oil component that is volatile at room temperature and normal pressure and has a boiling point at normal pressure in the range of approximately 60 to 260°C.

[0019] The volatile oil component (also referred to as "b1 component") is at least one selected from volatile silicone oils and volatile hydrocarbon oils. Examples of volatile silicone oils include linear, branched, and cyclic silicone oils with a viscosity of 5 cs (or cSt) or less, more preferably 3 cs or less, and even more preferably 2 cs or 1.5 cs. Examples of volatile hydrocarbon oils include isodecane, isododecane, and isohexadecane.

[0020] As component b1 in the cosmetic of the present invention, it is preferable to use a volatile silicone oil, and among these, it is particularly preferable to use a non-cyclic (straight-chain or branched-chain) silicone oil (dimethicone).

[0021] The cosmetic of the present invention contains a volatile oil (component b1) in an amount of 3 to 45% by mass, preferably 5 to 40% by mass, based on the total amount of the cosmetic. If the amount of volatile oil is less than 3% by mass or more than 45% by mass, the pore-concealing effect under high humidity conditions will be insufficient.

[0022] The oil component (component B) in the cosmetic of the present invention preferably contains (b2) a non-volatile oil component in addition to (b1) a volatile oil component. The non-volatile oil component (also referred to as "component b2") preferably contains (b2a) a non-volatile, non-silicone oil component.

[0023] In the present invention, "non-silicone oil" refers to an oil component that is liquid at room temperature and does not have a siloxane structure in its molecule, and includes polar oils and non-polar oils. Specific examples include hydrocarbon oils, fats and oils, higher fatty acids, higher alcohols, and ester oils. The incorporation of (b2a) non-volatile non-silicone oils improves the solubility of (C) the oil gelling agent and / or wax described below, further improving the stability and usability of the cosmetic preparation.

[0024] Examples of polar oils include oils having an IOB (Inorganic Organic Balance) value of 0.05 to 0.80, particularly ester oils. Specific examples include isostearic acid, isopropyl myristate, cetyl octanoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyldecyl dimethyloctanoate, isononyl isononanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cetyl ethylhexanoate, cholesteryl 12-hydroxystearate, and ethyl di-2-ethylhexanoate. Glycol, Dipentaerythritol Fatty Acid Ester, N-Alkyl Glycol Monoisostearate, Neopentyl Glycol Dicaprate, Diisostearyl Malate, Di-2-Heptylundecanoate Glycerin, Trimethylolpropane Tri-2-Ethylhexanoate, Trimethylolpropane Triisostearate, Pentaerythrityl Tetra-2-Ethylhexanoate, Glyceryl Tri-2-Ethylhexanoate (Triethylhexanoin), Cetyl Isooctanoate, Cetyl 2-Ethylhexanoate, 2- Ethylhexyl palmitate, C12-15 alkyl benzoate, cetearyl isononanoate, caprylic / capric triglyceride, butylene glycol dicaprylic / capric acid, glycerin trimyristate, 2-heptylundecanoic triglyceride, castor oil fatty acid methyl ester, oleyl oleate, cetostearyl alcohol, acetoglyceride, 2-heptylundecyl palmitate, diisobutyl adipate, 2-octyl N-lauroyl-L-glutamate Decyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, di-2-ethylhexyl succinate, ethyl acetate, butyl acetate, amyl acetate, triethyl citrate, 2-ethylhexyl paramethoxycinnamate, tripropylene glycol dipivalate, 2-ethylhexyl 2-cyano-3,3-diphenylacrylate, and the like.

[0025] Specific examples of non-polar hydrocarbon oils include mineral oil, liquid paraffin, isohexadecane, isododecane, squalane, squalene, pristane, isoparaffin, petrolatum, hydrogenated polyisobutene, and olefin oligomers.

[0026] In the cosmetic of the present invention, the blending amount of (b2a) non-volatile non-silicone oil is preferably 5 to 40 mass %, more preferably 10 to 35 mass %, and even more preferably 15 to 30 mass %, based on the total amount of the cosmetic. If the blending amount of (b2a) non-volatile non-silicone oil, especially non-polar oil, exceeds 40 mass %, shine may occur.

[0027] (C) Oil gelling agent and / or wax The cosmetic of the present invention is an oily solid cosmetic that contains (A) a water-absorbing polymer and (B) an oil component, as well as (C) an oil gelling agent and / or wax (also referred to as "component C") as essential components.

[0028] The wax used in the present invention is not particularly limited as long as it is one that is commonly used in cosmetics. Specific examples include, but are not limited to, petroleum waxes such as paraffin wax and microcrystalline wax, and natural waxes such as carnauba wax, candelilla wax, ozokerite, and ceresin, which have a melting point of 50° C. or higher at normal pressure.

[0029] The oil gelling agent is not particularly limited as long as it is one commonly used in cosmetics. Examples include, but are not limited to, condensates of benzaldehydes such as dibenzylidene sorbitol, tribenzylidene sorbitol, dibenzylidene xylitol, and paramethoxybenzylidene sorbitol with pentavalent or higher alcohols; metal soaps such as calcium stearate, calcium palmitate, lithium 2-ethylhexanoate, and aluminum 12-hydroxystearate; derivatives of N-acylamino acids such as amides, esters, and amine salts, including lauroyl glutamic acid dibutylamide, lauroyl glutamic acid stearylamide, dicaproyl lysine laurylamine salt, dicaproyl lysine lauryl ester, and dicaproyl lysine lauroyl phenylalanine laurylamide; dextrin fatty acid esters; 12-hydroxystearic acid; and oligomers obtained by condensing glycerin with a mixed fatty acid consisting of behenic acid and eicosadioic acid. Among these, dextrin fatty acid esters, commercially available products such as the "Leopearl" series (manufactured by Chiba Flour Milling Co., Ltd.), etc. can be preferably used.

[0030] In the present invention, the term "solid cosmetic" refers to a cosmetic having a hardness of 70 or more, preferably 90 or more, as measured by a rheometer at 25°C (measurement conditions: needle diameter 1.5 mmφ, penetration speed 2 cm / min, penetration length 10 mm, load weight 2 kg, rheometer manufactured by Fudo Kogyo Co., Ltd.). The rheometer hardness (γ) is generally defined by the following formula: γ = {(G × L) / (l × a)}(10 μN / cm 2 ) (where G is the measured stress (gr) × 9800 μN, L is the thickness of the sample (mm), l is the compression distance (mm), and a is the cross-sectional area of ​​the needle (cm 2 ) indicates.

[0031] Although the cosmetic of the present invention is an "oily solid cosmetic," this does not preclude the incorporation of a small amount of water (for example, 5% by mass or less). However, the presence of a small amount of water may cause the (A) water-absorbing polymer to aggregate, making it difficult to uniformly disperse. Therefore, when water is incorporated into the cosmetic of the present invention, the amount of water incorporated is set to 5% by mass or less, preferably 3% by mass or less, and more preferably 1% by mass or less, and the cosmetic of the present invention also includes embodiments that are substantially free of water.

[0032] In addition to the above, the cosmetic of the present invention may contain other optional ingredients that are commonly used in oil-based cosmetics, provided that the effects of the present invention are not impaired. Examples of other optional ingredients include powders, surfactants, UV absorbers, antioxidants, fragrances, colorants, preservatives, disinfectants, various drugs, moisturizers, etc.

[0033] The powder includes pigment-grade powders including white pigments such as titanium oxide and zinc oxide, colored pigments such as iron oxide, fine particle powders such as ultraviolet scattering agents, and powders such as spherical silica and mica. When the cosmetic of the present invention is formulated as a makeup cosmetic containing pigment-grade titanium oxide or the like, the amount of pigment-grade titanium oxide blended is preferably 30% by mass or less. In particular, when formulated as a concealer, it can be prepared in a range of 10 to 30% by mass, or 15 to 30% by mass. On the other hand, when formulated as a skin care cosmetic, the amount of pigment-grade titanium oxide blended can be less than 0.1% by mass.

[0034] The cosmetic of the present invention can be provided as makeup cosmetics such as a makeup base, foundation, concealer, blusher, eye shadow, mascara, eyeliner, eyebrow pencil, lipstick, etc., or as skin care cosmetics such as sunscreen, etc. In particular, it is suitable as makeup cosmetics, particularly foundations and concealers, taking advantage of its pore-concealing (pore-blurring) effect.

[0035] The cosmetic of the present invention can be used in a makeup method that includes applying the cosmetic to the face, and makeup applied in this manner will not come off even in a high-humidity environment caused by wearing a mask, etc., and its effect of blurring (concealing) pores will not be reduced. [Example]

[0036] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. Unless otherwise specified, the blending amounts are expressed in mass %.

[0037] Oil-based solid cosmetics were prepared using conventional methods according to the formulations shown in Tables 1 and 2 below. Each example cosmetic was applied to the face of a specialist panel, who then wore a mask. After two hours, the mask was removed. Immediately after removing the mask, the "pore-hiding effect (pore-blurring effect)," "non-glossiness," and "non-flaking" were evaluated according to the following criteria after exposure to a high humidity environment.

[0038] A+: Exceptionally good A: Excellent B: Excellent C: Normal D: Inferior

[0039] Furthermore, the cosmetic itself was evaluated under the heading of "stability and usability" based on the following criteria, from the viewpoint of whether a uniform and stable oily solid cosmetic could be prepared and whether it could be applied smoothly. A: Excellent B: Normal C: Inferior

[0040] [Table 1]

[0041] As shown in Table 1, Examples 1 to 5, which are oil-based solid cosmetics containing (A) water-absorbent polymer, (B) oil, and (C) oil gelling agent and / or wax, where the (B) oil contains (b1) volatile oil, exhibited excellent pore-concealing (pore-blurring) effects in high-humidity environments and did not cause shine or flakiness. Example 3, in which the (b1) volatile oil was cyclic silicone oil alone, showed a slightly reduced pore-concealing effect, but was still satisfactory for practical use. In contrast, Comparative Example 1, which did not contain (b1) volatile oil, exhibited insufficient pore-concealing effects and caused shine.

[0042] [Table 2]

[0043] From the results shown in Table 2, it was confirmed that when the blending amount of (b1) volatile oil in the cosmetic is adjusted to within the range of 3 to 45 mass%, the cosmetic has an excellent pore-concealing (pore-blurring) effect in a high humidity environment and does not cause shine or powdering, but when the blending amount is less than 3 mass% or more than 45 mass%, the pore-concealing effect is significantly reduced.

Claims

1. (A) a water-absorbing polymer consisting of sodium acrylate-grafted starch or acrylate crosspolymer-2-Na; (B) oil; and (C) Oil gelling agent and / or wax An oily solid cosmetic comprising: The (B) oil component contains 3 to 45 mass% of the (b1) volatile oil component relative to the total mass of the cosmetic, The (b1) volatile oil is an acyclic silicone oil, An oil-based solid cosmetic preparation, characterized in that the (B) oil component further contains (b2) a non-volatile oil component, and the (b2) non-volatile oil component contains (b2a) a non-volatile non-silicone oil in an amount of 5 to 40 mass% relative to the total mass of the cosmetic.

2. 2. The oily solid cosmetic according to claim 1, wherein the blending amount of the volatile oil component (b1) is 5 to 40% by mass based on the total amount of the cosmetic.

3. 2. The oily solid cosmetic according to claim 1, wherein the blending amount of the non-volatile non-silicone oil (b2a) is 10 to 35% by mass based on the total amount of the cosmetic.

4. The oily solid cosmetic preparation according to claim 1 , which is substantially free of water.

5. A makeup method for blurring pores in a high humidity environment, comprising applying an oily solid cosmetic composition described in any one of claims 1 to 4 to the face.

Images