Oil-based solid cosmetic

Abstract

To provide an oil-based solid cosmetic that has excellent cleansing performance and gives a refresh feeling after rinsing, and is suitable for oily skin, especially for males.SOLUTION: An oil-based solid cleansing cosmetic contains (A) 1-20 mass% of solid oil that has a melting point of 50-120°C and includes a hydrocarbon-based wax, (B) 50-90 mass% of liquid oil, (C) 15-40 mass% of a non-ionic surfactant with an HLB value of 6-13, (D) 0.1-20 mass% of powder having a volume average particle diameter of 1-200 μm, and (E) 0.1-10 mass% of a fumed silica metal oxide having a primary particle diameter of 1-50 nm, the proportions being based on the total amount of the cosmetic, wherein the mass ratio of the component (C) to the component (A), (C) / (A), is 2-10.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to an oily solid cleansing cosmetic.

Background Art

[0002] In recent years, in makeup cosmetics such as lipsticks, foundations, eyeshadows, and mascaras, products with excellent water resistance and oil resistance have been developed, and the durability of makeup has been significantly improved. Therefore, when removing the makeup film formed by makeup cosmetics, an oily cleansing cosmetic that is compatible with makeup (the makeup film on the skin) and has excellent performance in removing dirt such as keratin and sebum (dirt removal property) is used. Specific examples of oily cleansing cosmetics include cleansing oils, gel状 cleansing agents, cleansing creams, etc. Among them, oily cleansing cosmetics in a solid state at normal temperature have the characteristics of no dripping during use and being easy to massage when making them compatible with makeup, and their development is being actively promoted.

[0003] Patent Document 1 describes that when an oily solid cleansing cosmetic excellent in ease of rinsing and a refreshing feeling after rinsing can be obtained by blending (A) 1 to 30% by mass of a solid oil component having a melting point of 50 to 120°C, (B) 50 to 97% by mass of a liquid oil component, (C) 3 to 30% by mass of a nonionic surfactant having an HLB value of 5 to 13, (D) 0.1 to 20% by mass of a powder having a volume average particle diameter of 1 to 200 μm, and (E) 0.01 to 10% by mass of fumed silica (based on the total cosmetic). However, when this cosmetic is used by women with oily skin or men with a higher amount of sebum than women in general, they may still feel a sticky feeling during use, and a higher refreshing feeling after rinsing is required.

[0004] Furthermore, studies have also been conducted on solid oils used as ingredients in oily cleansing cosmetics. Patent document 2 describes a solid oil that combines Fischer-Tropsch wax, a hydrocarbon wax, and behenyl behenate, an ester-based solid oil, which has a low melting point while possessing high oil solidification ability. However, our own studies have revealed that when this cosmetic is used by women or men with oily skin, it still leaves a sticky feeling.

[0005] [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2020-026420 [Patent Document 2] Japanese Patent Publication No. 2021-143133 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] This invention was completed based on the aforementioned background technology, and its purpose is to provide an oil-based solid cleansing cosmetic that does not feel sticky even when used by men or women with oily skin, and leaves a refreshing feeling after rinsing. [Means for solving the problem]

[0008] Therefore, the inventors diligently conducted research to solve these problems and found that the above requirements can be met by using a solid oil containing hydrocarbon wax and controlling the mass ratio of a nonionic surfactant with a specific HLB value to the solid oil, thus completing the present invention.

[0009] Thus, the present invention provides an oily solid cleansing cosmetic containing (A) 1 to 20% by mass of a solid oil having a melting point of 50 to 120°C and containing a hydrocarbon wax, (B) 50 to 90% by mass of a liquid oil, (C) 15 to 40% by mass of a nonionic surfactant having an HLB value of 6 to 13, (D) 0.1 to 20% by mass of a powder having a volume average particle diameter of 1 to 200 μm, and (E) 0.1 to 10% by mass of fuzzy silica having a primary particle diameter of 1 to 50 nm (percentage of the total amount of the cosmetic), wherein the mass ratio of component (C) to component (A) [(C) / (A)] is 2 to 10. [Effects of the Invention]

[0010] The oil-based solid cleansing cosmetic of the present invention offers a non-greasy feel and excellent cleansing power, as well as superior ease of rinsing and a refreshing feeling after rinsing. [Modes for carrying out the invention]

[0011] (A: Solid oil content) In the present invention, component (A) is a solid oil that is solid at room temperature (25°C) and contains hydrocarbon wax as at least some of its components. The hydrocarbon wax content in the solid oil is preferably 5% by mass or more, more preferably 20 to 95% by mass, and even more preferably 30 to 90% by mass. Because the hydrocarbon wax content is within this range, a small amount of solid oil can solidify the liquid oil, thus reducing the amount of solid oil that can be used. As a result, less solid oil remains on the skin, and a refreshing feeling after rinsing is obtained.

[0012] The melting point of the solid oil is 50 to 120°C, preferably 55 to 105°C, and more preferably 60 to 100°C. The melting point of the solid oil can be measured by the second melting point measurement method, which is a general test method of the Quasi-Drug Raw Material Standards. If the melting point is excessively low, the liquid oil of component (B) cannot be solidified uniformly, and the oily solid cleansing cosmetic may liquefy due to vibration or impact during transportation or carrying, or it may have poor shape retention and cannot maintain its solid form. Conversely, if the melting point is excessively high, the composition becomes hard, making it difficult to pick up when used as a cleansing cosmetic, and high-temperature operation is required to melt it, which can easily cause oxidative degradation of components (B) and (C).

[0013] Examples of hydrocarbon waxes that are essential components of solid oil include paraffin wax, polyethylene, ethylene-propylene copolymer, microcrystalline wax, ceresin, ozokerite, and Fischer-Tropsch wax. Among these, Fischer-Tropsch wax and polyethylene are preferable because they have a high ability to solidify liquid oil even in small amounts. Commercially available hydrocarbon waxes include paraffin waxes such as Paraffin Wax 135, Paraffin Wax 140, Paraffin Wax 150, and HNP-11 from Nippon Seiro Co., Ltd.; microcrystalline waxes such as HNP-9, Hi-Mic-2065, Hi-Mic-1070, Hi-Mic-1080, Hi-Mic-1090, and HNP-0190 from Nippon Seiro Co., Ltd., and Multiwax W-445 from Sonneborn; polyethylene waxes such as PERFORMALENE 400, PERFORMALENE 500, and PERFORMALENE 655 from NEW PHASE TECHNOLOGIES; and synthetic waxes (Fischer-Tropsch waxes) such as CIREBELLE 108 and CIREBELLE 305 from CIREBELLE.

[0014] The solid oil component may consist solely of hydrocarbon waxes, but other solid oils may be included as desired. Examples of solid oil components that can be used in combination with hydrocarbon waxes include waxes such as Japanese wax, carnauba wax, candelilla wax, rice wax, and beeswax, as well as hydrogenated jojoba oil, behenyl behenate, hydrogenated castor oil, hydrogenated oils, higher alcohols, and silicone waxes. Commercially available examples of these include refined candelilla wax No. 1 and Candelilla NC1630 from Cerarica NODA, refined candelilla wax CG-7 and refined candelilla wax SR-3 from Yokozeki Oil & Fat Industry Co., Ltd., refined candelilla wax CG-7 and refined candelilla wax SR-3 from Nippon Natural Products Co., Ltd., and high-melting-point candelilla wax FR100 from Nippon Natural Products Co., Ltd.; and behenyl behenate from Riken Vitamin Co., Ltd.

[0015] The above component (A) may consist of a single compound, or it may be composed of two or more compounds in appropriate combination. In particular, when hydrocarbon waxes, especially Fischer-Tropsch wax and behenyl behenate are used in combination, the melting point of the solid oil is lowered and high oil solidification ability is exhibited. When Fischer-Tropsch wax and behenyl behenate are used in combination, the ratio of behenyl behenate (b) to Fischer-Tropsch wax (f) [(b):(f)]] is preferably 10:90 to 90:10 by mass ratio, and especially preferably 20:80 to 90:10.

[0016] (A) The content of component (A) is 1 to 20% by mass of the total oil-based solid cosmetic composition, preferably 2 to 15% by mass, and more preferably 3 to 10% by mass. If component (A) is too little, the shape retention will be insufficient, and the product will be too soft, reducing the massage effect. Conversely, if it is too much, it will feel sticky, be difficult to wash off, and reduce the refreshing feeling after rinsing.

[0017] (B) Liquid oil The liquid oil (B) used in this invention is an oil that is semi-solid to liquid at room temperature with a melting point of less than 50°C. It is not particularly limited as long as it is an oil commonly used in cosmetics, and may be an animal oil, vegetable oil, or synthetic oil. Specific examples of liquid oils include ethylhexyl palmitate, caprylic / capric triglyceride, triethylhexanoin, dicaprylyl carbonate, diisostearyl malate, diglyceryl triisostearate, decaglyceryl decaisostearate, oligomer esters of dimer acid and dimerol, pentaerythritol tetraisostearate, diglyceryl tetraisostearate, cetyl ethylhexanoate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, neopentyl glycol dioctanoate, cholesterol fatty acid esters, jojoba oil, and other esters; volatile isoparaffins, polybutene, polyisobutylene, heavy liquid isoparaffins, liquid paraffins, α-olefin oligomers, squalane, petrolatum, and other hydrocarbons; oils and fats such as olive oil, castor oil, mink oil, and macadamia nut oil; and fatty acids such as isostearic acid and oleic acid. Examples include higher alcohols such as oleyl alcohol and isostearyl alcohol; silicone oils such as low-molecular-weight dimethylpolysiloxane, cyclic silicone, high-molecular-weight dimethylpolysiloxane, methylphenylpolysiloxane, methyl trimethicone, caprylyl trimethicone, cross-linked organopolysiloxane, and fluorine-modified polysiloxane; fluorinated oils such as perfluoropolyethers; and lanolin derivatives such as lanolin, lanolin acetate, isopropyl lanolin fatty acid, and lanolin alcohol.

[0018] From the viewpoint of makeup removal and ease of rinsing, the use of esters is preferred, and ethylhexyl palmitate, caprylic / capric triglyceride, triethylhexanoin, and dicaprylyl carbonate are preferably used.

[0019] In the total amount of the oily solid cleansing cosmetic, the content of (B) liquid oil is 50 to 97% by mass, preferably 55 to 95% by mass, more preferably 60 to 92% by mass. By having the content of the liquid oil within this range, good cleansing performance (good makeup removal) can be achieved.

[0020] (C) Nonionic surfactant In the oily solid cleansing cosmetic of the present invention, a nonionic surfactant having an HLB value in the range of 6 to 13 is used as the component (C). Here, the "nonionic surfactant having an HLB value in the range of 6 to 13" means either one nonionic surfactant having an HLB value in the range of 6 to 13 or a combination of a plurality of nonionic surfactants having HLB values within that range. In the present invention, a nonionic surfactant having an HLB value outside this range may be included, but from the viewpoint of the refreshing feeling after rinsing, the content of the nonionic surfactant having an HLB value less than 6 is preferably 1% by mass or less based on the whole cosmetic.

[0021] Note that HLB is an index indicating the balance between hydrophilicity and lipophilicity with values ranging from 0 to 20, showing that the closer to 0, the higher the lipophilicity, and the closer to 20, the higher the hydrophilicity. As methods for calculating the HLB value, various calculation methods are known, and in addition, the value is described in catalogs etc. provided by manufacturers. In this specification, for the HLB value of a nonionic surfactant, when the nonionic surfactant is a commercially available product, the HLB value described in the manufacturer's catalog is adopted, and when it is not a commercially available product, the value calculated by the Griffin method (HLB value = 20 × sum of the formula weights of the hydrophilic parts / molecular weight) described on page 307 of "Surfactant Handbook" (published by Sangyo Tosho Co., Ltd., issued in 1960) is adopted.

[0022] If the HLB value of the nonionic surfactant is less than 6, even if you try to rinse off the makeup with water or lukewarm water after applying the cleansing cosmetic to the skin, it will not rinse off cleanly due to poor compatibility with water, and you will not get the refreshing feeling after rinsing. Conversely, if the HLB value exceeds 13, hydrophobic makeup will not be able to be applied to the cleansing cosmetic, resulting in insufficient makeup removal. Among these, an HLB value in the range of 7 to 11 provides good makeup removal and ease of rinsing. The nonionic surfactant in component (C) may be in solid or liquid form, but using a liquid nonionic surfactant at 25°C will provide better performance in terms of makeup removal and ease of rinsing.

[0023] Specific examples of the nonionic surfactant having an HLB value of 6 to 13 used as the (C) component include polyglycerol fatty acid esters such as polyglyceryl-4 stearate, polyglyceryl-2 oleate, polyglyceryl-2 isostearate, and polyglyceryl-10 distearate; polyoxyethylene hydrogenated castor oils such as PEG-10 hydrogenated castor oil and PEG-20 hydrogenated castor oil; polyoxyethylene fatty acid esters such as PEG-5 stearate; polyoxyethylene alkyl ethers such as Oleth-3 and Steareth-6; fatty acid polyoxyethylene alkyl ethers such as Laureth-8 isostearate and Steareth-12 stearate; polyoxyethylene fatty acid glyceryls such as PEG-15 glyceryl tristearate, PEG-5 glyceryl triisostearate, PEG-10 glyceryl triisostearate, PEG-20 glyceryl triisostearate, and PEG-20 glyceryl tristearate; fatty acid polyoxyethylene hydrogenated castor oils such as PEG-15 hydrogenated castor oil isostearate and PEG-20 hydrogenated castor oil triisostearate; etc. Other examples include sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene polyoxypropylene copolymers, ethers of polyoxyethylene polyoxypropylene copolymers and long-chain alcohols, ethers of polybutylene glycol polyglycerol copolymers and long-chain alcohols, etc. Among them, polyoxyethylene fatty acid esters, polyoxyethylene fatty acid glyceryls, fatty acid polyoxyethylene hydrogenated castor oils, and fatty acid polyoxyethylene alkyl ethers are preferably used from the viewpoints of makeup removal and ease of washing off.

[0024] When the nonionic surfactant used as the (C) component has a fatty acid residue in the molecule, the fatty acid residue is preferably a residue of a higher fatty acid having 10 to 22 carbon atoms such as myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, etc. Among them, it is preferably a residue of a branched higher fatty acid in which the properties of the nonionic surfactant become liquid and the oxidation resistance stability is excellent, and particularly preferably an isostearic acid residue.

[0025] (C) Examples of commercially available nonionic surfactants that are liquid at 25°C and can be used as an ingredient include Emarex RWIS-320 (PEG-20 hydrogenated castor oil triisostearate; manufactured by Nippon Emulsion Co., Ltd.; HLB value 6) and Uniox GT-20IS (PEG-20 glyceryl triisostearate; manufactured by NOF Corporation; HLB value 10.4). Examples of commercially available solid surfactants that are solid at 25°C include Emarex GWS-320 (PEG-20 glyceryl tristearate; manufactured by Nippon Emulsion Co., Ltd.; HLB value 8), Emarex SWS-12 (Steareth-12 stearate; manufactured by Nippon Emulsion Co., Ltd.; HLB value 8), and Emarex 608 (Steareth-8; manufactured by Nippon Emulsion Co., Ltd.; HLB value 9).

[0026] The amount of ingredient (C) used is 15 to 40% by mass, preferably 15 to 35% by mass, and more preferably 18 to 30% by mass, of the total amount of the oil-based solid cleansing cosmetic. If this amount is too low, the ease of rinsing and the refreshing feeling after rinsing will decrease, and if it is too high, there is a concern that it may irritate the skin.

[0027] In the oil-based solid cleansing cosmetic composition of the present invention, the mass ratio [(C) / (A)] of the nonionic surfactant of component (C) to the solid oil of component (A) is 2 to 10, preferably 2.2.5 to 8, and more preferably 3 to 7. If the value of [(C) / (A)] is excessively small, the solid oil tends to remain on the skin even after rinsing, and a refreshing feeling after rinsing is not obtained. If it is excessively large, there is a concern that it may cause dryness or skin irritation.

[0028] (D: Powder) In this invention, in addition to the above components (A) to (C), a powder is used as component (D). The powder used in this invention has a volume average particle size of 1 to 200 μm, preferably 2 to 100 μm, and more preferably 5 to 50 μm. By incorporating an appropriate amount of powder with such an average particle size, it contributes to the adsorption of makeup residue and the provision of appropriate friction during massage, as well as improving makeup removal and massage effects. It also adsorbs excess sebum, thus particularly improving the refreshing feeling after rinsing. If the volume average particle size of the powder is excessively small, the effects of improving makeup removal and ease of massage cannot be obtained. Conversely, if it is excessively large, irritation may be felt during massage, and sedimentation of the powder is more likely to occur when manufacturing cosmetics. As a result, the dispersion of the powder becomes uneven, impairing the appearance and quality stability of the product.

[0029] In this invention, the volume-average particle diameter is measured using a laser diffraction / scattering particle size distribution analyzer (e.g., LA-950 manufactured by Horiba, Ltd.) with 95% ethanol as the solvent and ultrasonic dispersion for 5 minutes (Honda Electronics Co., Ltd. ultrasonic cleaner W-113, 28kHz), and does not refer to the primary particle diameter.

[0030] The amount of ingredient (D) is 0.1 to 20% by mass, preferably 0.2 to 15% by mass, and more preferably 1 to 10% by mass, relative to the total cosmetic composition. Including ingredient (D) within this range improves makeup removal and massage effect.

[0031] The powder of component (D) is not particularly limited as long as it is suitable for use in cosmetics, and any powder can be used regardless of its material (organic, inorganic, etc.), shape (spherical, needle-shaped, plate-shaped, etc.) or particle structure (porous, non-porous, etc.). Among these, powders that are porous or have a large specific surface area are preferred because they have excellent ability to adsorb makeup residue and excess sebum.

[0032] Examples of the powders in component (D) include clay minerals such as talc, muscovite, synthetic mica, phlogopite, synthetic fluorinated phlogopite, sericite, zeolite, kaolin, bentonite, saponite, hectorite, natural clay, sea mud, and activated clay; inorganic oxides or crystalline salts such as silicic acid, anhydrous silicic acid (silica), magnesium silicate, aluminum magnesium silicate, calcium silicate, barium sulfate, magnesium carbonate, boron nitride, bismuth oxychloride, alumina, zirconium oxide, and hydroxyapatite; organic powders such as silicone powder, silicone elastic powder, polyurethane powder, cellulose powder, nylon powder, silk powder, PMMA powder, starch, polyethylene powder, lauroyl lysine, metal soap, and plant powders (apricot kernel granules, walnut kernel granules, glucomannan powder, etc.); carbon powders such as activated carbon, medicinal charcoal, and bamboo charcoal; and composites and granules thereof.

[0033] Among these, using clay minerals or charcoal powder can yield a cleansing cosmetic that is even better at removing makeup and leaving a refreshing feeling after rinsing. Natural clays and sea muds, which are clay minerals, do not necessarily have the same composition or hue depending on the place of origin, but they are all mixtures of kaolin, montmorillonite, mica, etc. Specific examples of natural clays and sea muds include Moroccan lava clay, Tanakura clay, Palauan white clay, Sparclay (trade name) and Tersil (trade name) from Brazil, and Claargile (trade name) from France.

[0034] In this invention, the present invention further contains fuzzy silica as component (E). To manufacture a cleansing cosmetic with a formulation containing solid oil, it is necessary to fill a predetermined container with a uniformly mixed molten formulation and then cool and solidify it. In the case of a formulation containing the powder component (D), if the formulation filled in the container solidifies quickly, the dispersion of the powder can be maintained uniformly. For example, makeup cosmetics such as lipstick generally weigh only a few grams, so the time from filling to solidification is extremely short, and there is little risk of the dispersibility of the powder contained in the formulation being impaired. However, in the case of cleansing cosmetics, the weight per product is generally around 100 grams or more, so even if the container filled with the formulation is cooled from the outside with cold air, the time required for solidification is long, and sedimentation of the powder component may occur during that time. When the powder component settles, the dispersion of the powder component becomes uneven, and an imbalance in the content of the powder component occurs in the vertical direction of the cosmetic. As a result, the appearance of the cosmetic is impaired, and the stability of its quality is also compromised.

[0035] Component (E), fumed silica, is a fine amorphous silica also known as fumed silica, and its appearance is that of a fluffy, light, white powder. Fumed silica can be obtained, for example, by high-temperature hydrolysis of a raw material such as silicon tetrachloride in an oxyhydrogen flame. The primary particle size of fumed silica is 1 to 50 nm, preferably 3 to 25 nm, and particularly preferably 5 to 15 nm. If the primary particle size is excessively large, the settling of component (D) cannot be effectively suppressed when the formulation is melted and filled during the manufacturing process of the cleansing cosmetic. The primary particle size can be determined as the average value of 30 to 50 particles measured by transmission electron microscopy or electro-emission scanning electron microscopy, or the value may be listed in a catalog provided by the manufacturer. In this specification, the primary particle size of fumed silica is the value listed in the manufacturer's catalog. The specific surface area of ​​fumed silica is preferably 30 m². 2 It is 1 / g or more, and more preferably 50-400m 2 The value is / g, and is particularly preferably 100-400m 2The value is / g. If the specific surface area is excessively small, the settling of component (D) cannot be effectively suppressed when melting and filling the formulation during the manufacturing process of the cleansing cosmetic.

[0036] The amount of component (E) is 0.01 to 10% by mass, preferably 0.1 to 5% by mass, and more preferably 0.2 to 3% by mass, relative to the total cosmetic composition. The ratio of component (E) to component (D) (E / D) is preferably 0.01 to 10, and more preferably 0.05 to 5. When the amount of component (E) is within the above range, the dispersion state of component (D) contained in the cosmetic material is improved, and the settling of component (D) can be effectively suppressed when the formulation is melted and filled during the manufacturing process of the cleansing cosmetic composition.

[0037] Component (E) may be untreated fuzzy silica exhibiting hydrophilicity, or fuzzy silica that has undergone hydrophobic treatment. Specific examples of hydrophobic treatments include dimethyldichlorosilane treatment, trimethylsiloxy treatment with trimethylsilyl chloride or hexamethyldisilazane, octylsilanation treatment, dimethyl silicone oil treatment, coating and baking treatment using methylhydrogenpolysiloxane, and coating with metal soap. Among these fuzzy silicas, untreated silica is preferred from the viewpoint of ease of washing.

[0038] (E) Commercially available products of component (E) include, as untreated fuzzy silica, AEROSIL 50, AEROSIL 130, AEROSIL 200, AEROSIL 200V, AEROSIL 200CF, AEROSIL 200FAD, AEROSIL 300, AEROSIL 300CF, AEROSIL 380, AEROSIL 380S (all manufactured by Nippon Aerosil Co., Ltd.); as hydrophobically treated products, AEROSIL R972, AEROSIL R972V, AEROSIL R972CF, AEROSIL R974, AEROSIL R976S, AEROSIL RX200, AEROSIL RX300, AEROSIL RY200, AEROSIL R202, AEROSIL R805, AEROSIL R812, AEROSIL Examples include the RA200H (manufactured by Nippon Aerosil Co., Ltd.) and the CAB-O-SIL TS530 (manufactured by Cabot Corporation).

[0039] The oil-based solid cleansing cosmetic composition of the present invention may contain a small amount of water as component (F). Preferably, the water content is 5% by mass or less of the total cosmetic composition. Within this range, the nonionic surfactant of component (C) and water are in a solubilized state, that is, the oily component is present as a dispersion medium, and component (C) and water form reverse micelles. As a result, the nonionic surfactant of component (C) becomes more easily soluble in the oil, and separation or precipitation of component (C) does not occur even during long-term storage, improving storage stability. In particular, this effect is significant when the water content is 0.02 to 3% by mass.

[0040] The oil-based solid cleansing cosmetic composition of the present invention may contain additives such as powders other than component (D), dyes, oil-based gelling agents, oil-soluble resins, polyhydric alcohols, lower alcohols, UV absorbers, UV scattering agents, humectants, fragrances, antioxidants, preservatives, defoaming agents, beauty ingredients, and various extracts, to the extent that they do not impair the effects of the present invention.

[0041] The oil-based solid cleansing cosmetic of the present invention does not exhibit fluidity at room temperature (25°C) and atmospheric pressure (1 atm), and its shape is not particularly limited. Specific examples of shapes include stick-shaped, rod-shaped, plate-shaped, and those formed by pouring into a container. These various cleansing cosmetic compositions can be prepared according to conventional methods. For example, all raw materials can be heated above their melting point, mixed uniformly, poured into a container or mold while still molten, and then cooled or allowed to cool to obtain an oil-based solid cleansing cosmetic.

[0042] The oil-based solid cleansing cosmetic of the present invention is non-greasy and provides a refreshing feeling after rinsing, making it suitable for use as a cleansing cosmetic for oily skin, and especially for men. In addition to its makeup-removing function, the oil-based solid cleansing cosmetic of the present invention possesses the characteristics required for massage cosmetics, namely, appropriate viscosity, slipperiness, and sustained slipperiness. Therefore, it can be used as a massage cosmetic in addition to its function as an oil-based solid cleansing cosmetic of the present invention. When using the oil-based solid cleansing cosmetic of the present invention, makeup can be removed by applying the cosmetic to the makeup and then rinsing it off with water or lukewarm water. Therefore, it is possible to omit the facial cleansing step with soap or other facial wash, which was considered necessary after using conventional oil-based solid cleansing cosmetics. [Examples]

[0043] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to these examples. Unless otherwise specified, the amounts of ingredients in the formulations described below are in mass percent of the total amount. Furthermore, the evaluation method for the oil-based solid cleansing cosmetic composition of the present invention in the following examples and comparative examples is as follows.

[0044] (Non-sticky, removes makeup well, easy to rinse off, leaves a refreshing feeling after rinsing) Ten male evaluators aged 20-40 applied commercially available skin-toned sunscreen cream (ACRO, Fiveism by Three FF Control UV Tool) to their skin, then cleansed with an evaluation sample. For each item, they scored it on a 5-point scale from 1 to 5 based on the evaluation criteria shown in (1) below. The average score of the 10 evaluators was calculated, and the performance as a cleansing cosmetic was determined according to the 4-point evaluation criteria shown in (2) below.

[0045] (1) Evaluation Criteria 5 points: Good 4 points: Fairly good 3 points: Can't say either way. 2 points: Slightly bad 1 point: Bad

[0046] (2) Four-stage evaluation criteria A: Average score between 4 and 5 B: Average score between 3 and 4 C: Average score between 2 and 3 D: Average score is less than 2

[0047] Examples 1-3 and Comparative Examples 1-4 (Oil-based solid cleansing cosmetic) Oil-based solid cleansing cosmetics with the formulations shown in Table 1 were prepared according to the following manufacturing procedure. The obtained oil-based solid cleansing cosmetics were evaluated for non-stickiness, makeup removal effectiveness, ease of rinsing, and refreshing feeling after rinsing using the method described above. The evaluation results are shown in Table 3.

[0048] (Manufacturing procedure) (1) Heat the ingredients 1 to 13 shown in Table 1 to 82°C and mix them uniformly. (2) Fill the mixture prepared in (1) above into a jar container at 70°C while still in a molten state, and then allow it to cool to obtain an oil-based solid cleansing cosmetic.

[0049] [Table 1]

[0050] As shown in Table 1, the oil-based solid cleansing cosmetics of Examples 1 and 2 were excellent in terms of non-stickiness, effective makeup removal, ease of rinsing, and refreshing feeling after rinsing. The oil-based solid cleansing cosmetic of Example 3 was also excellent in terms of non-stickiness, effective makeup removal, and ease of rinsing, and provided a good refreshing feeling after rinsing. In contrast, oil-based solid cleansing cosmetics with a low content of component (C) and a [(C) / (A)] ratio of less than 2 were inferior in terms of ease of rinsing and refreshing feeling after rinsing (Comparative Example 1). Furthermore, the oil-based solid cleansing cosmetic (Comparative Example 2) that did not contain components (D) and (E) was significantly inferior in terms of ease of rinsing and the refreshing feeling after rinsing. In addition, the oil-based solid cleansing cosmetic (Comparative Example 3) which had a higher content of component (A) and a [(C) / (A)] ratio of less than 2 compared to Example 1, and the oil-based solid cleansing cosmetic (Comparative Example 4) which had a higher content of component (A) and a lower content of component (C) compared to Example 3, were inferior in terms of ease of rinsing and the refreshing feeling after rinsing. [Industrial applicability]

[0051] The present invention provides an oil-based solid cosmetic product that offers excellent cleansing performance and a refreshing feeling after rinsing, making it suitable for oily skin, and especially for men.

Claims

1. An oil-based solid cleansing cosmetic comprising: (A) 1 to 20 mass% of a solid oil having a melting point of 50 to 120°C and composed of 20 to 95 mass% of a hydrocarbon wax and 80 to 5 mass% of other solid oils; (B) 50 to 97 mass% of a liquid oil; (C) 15 to 40 mass% of a nonionic surfactant having an HLB value of 6 to 13; (D) 0.1 to 20 mass% of a powder having a volume average particle size of 1 to 200 μm; and (E) 0.01 to 10 mass% of fumed silica having a primary particle size of 1 to 50 nm (proportion relative to the total amount of the cosmetic); and wherein the mass ratio of component (C) to component (A) [(C) / (A)] is 2 to 10.

2. 2. The oil-based solid cleansing cosmetic according to claim 1, wherein the hydrocarbon wax is a Fischer-Tropsch wax.

3. 3. The oil-based solid cleansing cosmetic according to claim 1, wherein the other solid oil is at least one selected from the group consisting of waxes, hydrogenated jojoba oil, behenyl behenate, hydrogenated castor oil, hardened oil, higher alcohols, and silicone waxes.

4. 3. The oil-based solid cleansing cosmetic according to claim 2, wherein the other solid oil is behenyl behenate.

5. An oil-based solid cleansing cosmetic composition as described in claim 4, wherein the mass ratio of behenyl behenate (b) to Fischer-Tropsch wax (f) [(b):(f)]] is 10:90 to 90:10.