Oily solid cleansing cosmetic

Abstract

To provide an oily solid cleansing cosmetic which has excellent skin-friendliness while being improved in cleansing performance, and has no problem with stability, such as discoloration, while exhibiting a brilliant color derived from natural raw materials.SOLUTION: An oily solid cleansing cosmetic to be used is characterized by comprising (A) a solid oil component having a melting point of 50 to 120°C, (B) a liquid oil component, (C) a nonionic surfactant having an HLB value of 5 to 13, and (D) a tea leaf powder, where the content of water (per the whole amount of the cosmetic) is 1 mass% or less.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a solid oil-based cleansing cosmetic preparation. [Background technology]

[0002] In recent years, makeup cosmetics such as lipstick, foundation, eye shadow, and mascara have been developed with excellent water resistance and oil resistance, and the makeup durability has been significantly improved. Therefore, when removing makeup cosmetics, oil-based cleansing cosmetics are used, which have good compatibility with makeup (cosmetic film on the skin) and excellent performance (stain removal) in removing dirt such as keratin and sebum. Specific examples of oil-based cleansing cosmetics include cleansing oil, gel-type cleansing agents, and cleansing creams. Among them, oil-based cleansing cosmetics that are solid at room temperature have the characteristic that they do not drip when used and are easy to massage when blending with makeup. In order to further improve the stain removal ability of oil-based cleansing cosmetics, the incorporation of scrubbing agents such as powders has also been considered, but on the other hand, gentleness to the skin is also required, and a combination of high stain removal ability and skin moisturization is required.

[0003] Patent Document 1 discloses a soap composition containing matcha, and states that matcha is suitable as a scrubbing agent because it is not hard and has a moderate texture (paragraph 0004). The document also describes that there is no discoloration even one month after production, but since a soap composition formulation inevitably comes into contact with water during use, it is inevitable that the matcha will react with moisture and discolor or fade after even one use.

[0004] Patent Document 2 describes that an oil-based solid cleansing cosmetic product that is easy to wash off and leaves a refreshing feeling after washing off can be obtained by blending (A) 1 to 30% by mass of a solid oil with a melting point of 50 to 120°C, (B) 50 to 97% by mass of a liquid oil, (C) 3 to 30% by mass of a nonionic surfactant with an HLB value of 5 to 13, (D) 0.1 to 20% by mass of a powder with a volume average particle size of 1 to 200 μm, and (E) 0.01 to 10% by mass of aerosolized silica (based on the total cosmetic product). It also describes that a cleansing cosmetic product that is excellent in dirt removal and refreshing feeling can be obtained by using clay minerals or charcoal powder as the powder of component (D) (paragraph 0006). However, when such inorganic powder is used, although the dirt removal property is improved, there is a problem that the skin is hard to the touch and removes sebum and oil too much, which easily leads to dry skin. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2014-125556 A [Patent Document 2] JP 2020-26420 A Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention was completed against the background of the above-mentioned technology, and an object of the present invention is to provide an oil-based solid cleansing cosmetic composition which has improved cleansing performance while being gentle to the skin, exhibits vivid color tones due to naturally derived raw materials, and is free from stability problems such as discoloration. [Means for solving the problem]

[0007] Therefore, the inventors conducted extensive research to solve these problems and discovered that an oil-based solid cleansing cosmetic composition containing a high-melting point solid oil, liquid oil, a nonionic surfactant having a specific HLB value, as well as green tea powder and fumed silica, and having a water content of 0.5 mass% or less, satisfies the above requirements, thereby completing the present invention.

[0008] Thus, according to the present invention, there is provided an oil-based solid cleansing cosmetic composition which contains (A) a solid oil component having a melting point of 50 to 120°C, (B) a liquid oil component, (C) a nonionic surfactant having an HLB value of 5 to 13, and (D) green tea powder, and has a water content of 0.5 mass% or less (standard for all cosmetics). Effect of the Invention

[0009] The oil-based solid cleansing cosmetic composition of the present invention is excellent in cleansing performance and gentleness to the skin, and exhibits vivid colors due to the use of naturally derived raw materials, while also exhibiting excellent stability. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (A: solid oil content) In the present invention, the solid oil of component (A) is a solid oil at room temperature (25°C), and its melting point 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 melting point measurement method 2, which is a general test method in the Quasi-Drug Raw Materials Standards. As the melting point becomes lower, the composition becomes softer and easier to remove with fingers when used as a cleansing cosmetic, and the operation at room temperature when melting is easier, so that oxidative deterioration of components (B) and (C) is less likely to occur. Conversely, as the melting point becomes higher, it becomes easier to uniformly solidify the liquid oil of component (B), and the oil-based solid cleansing cosmetic is less likely to liquefy due to vibration or impact during transportation or carrying, and has good shape retention and can maintain its solid shape.

[0011] Specific examples of such solid oils include hydrocarbon waxes such as paraffin wax, polyethylene wax, ethylene-propylene copolymer, microcrystalline wax, ceresin, ozokerite, and Fischer-Tropsch wax, as well as Japan wax, carnauba wax, candelilla wax, rice wax, beeswax (beeswax), hydrogenated jojoba oil, behenyl behenate, hardened oil, higher alcohol, and silicone wax.

[0012] Commercially available products of these solid oils include paraffin waxes such as Paraffin Wax 135, Paraffin Wax 140, Paraffin Wax 150, and HNP-11 manufactured by 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 manufactured by Nippon Seiro Co., Ltd., and Multiwax W-445 manufactured by Sonneborn Co., Ltd.; polyethylene waxes such as PERFORMALENE 400, PERFORMALENE 500, and PERFORMALENE 655 manufactured by NEW PHASE TECHNOLOGIES Co., Ltd.; and synthetic waxes (Fischer-Tropsch waxes) such as CIREBELLE 108 and CIREBELLE 305; Candelilla waxes include refined candelilla wax NO.1 and Candelilla NC1630 from Cerarica NODA, refined candelilla wax CG-7 and refined candelilla wax SR-3 from Yokoseki Oil Industry Co., Ltd., refined candelilla wax CG-7 and refined candelilla wax SR-3 from Japan Natural Products, high melting point candelilla wax FR100 from Japan Natural Products, and behenyl behenate from Riken Vitamin Co., Ltd.

[0013] Oil-based solid cleansing cosmetics are significantly different from oil-based solid cosmetics in makeup cosmetics such as lipstick in that they are large-volume, and it is necessary to maintain the composition in a molten state for a long time during the process of filling into a specified container.Therefore, as the solid oil, wax that is excellent in stability against oxidation when heated is preferred, and specifically, hydrocarbon wax, especially polyethylene wax and Fischer-Tropsch wax are preferably used.In addition, behenyl behenate, which is a synthetic wax ester, is also preferably used.

[0014] The above-mentioned (A) component may be a single compound, or two or more compounds may be used in combination. The content of the (A) component is preferably 1 to 30% by mass, more preferably 2 to 20% by mass, and particularly preferably 3 to 15% by mass, based on the total oil-based solid cosmetic. As the (A) component decreases, the cosmetic is easier to remove from the fingers, spreads well when used, and is easier to massage, but is more likely to become liquefied due to vibration or impact. On the other hand, as the (A) component increases, the shape retention improves, making it easier to produce an oil-based solid cleansing cosmetic in a stick form. When the cosmetic is in a stick form, the content of the (A) component is preferably 5 to 30% by mass based on the total cosmetic, which allows particularly good shape retention to be obtained.

[0015] (B: Liquid oil) In the oil-based solid cleansing cosmetic of the present invention, a liquid oil (B) is used from the viewpoints of compatibility with makeup on the skin and ease of spreading when applied to the skin. Here, "liquid oil" refers to oil that has fluidity at room temperature (25°C) and semi-solid oil with a melting point of less than 50°C, and also includes volatile oil with a boiling point of less than 260°C.

[0016] The liquid oil (B) used in the present invention is not particularly limited as long as it is one that is commonly used in cosmetics, and may be any of animal oils, vegetable oils, and synthetic oils. Specific examples of liquid oils include esters such as triethylhexanoin, diisostearyl malate, diglyceryl triisostearate, decaglyceryl decaisostearate, oligomer esters of dimer acid and dimer diol, pentaerythritol tetraisostearate, diglyceryl tetraisostearate, cetyl isooctanoate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, neopentyl glycol dioctanoate, cholesterol fatty acid esters, and jojoba oil; hydrocarbons such as volatile isoparaffin, polybutene, polyisobutylene, heavy liquid isoparaffin, liquid paraffin, α-olefin oligomer, squalane, and petrolatum; oils and fats such as olive oil, castor oil, mink oil, and macadamia nut oil; fatty acids such as isostearic acid and oleic acid; higher alcohols such as oleyl alcohol and isostearyl alcohol; Examples of suitable oils include silicone oils such as low polymerization degree dimethylpolysiloxane, cyclic silicone, high polymerization degree dimethylpolysiloxane, methylphenylpolysiloxane, methyltrimethicone, caprylyl trimethicone, crosslinked organopolysiloxane, and fluorine-modified polysiloxane; fluorine-based oils such as perfluoropolyether; lanolin derivatives such as lanolin, lanolin acetate, lanolin fatty acid isopropyl, and lanolin alcohol; and the like.

[0017] The content of the (B) liquid oil is preferably 50 to 97% by mass, more preferably 55 to 95% by mass, and even more preferably 60 to 90% by mass, based on the total amount of the oil-based solid cosmetic. The more the (B) component is present, the better it blends with makeup, and the longer it spreads, making it easier to massage. Conversely, the less the (B) component is present, the better the shape retention and the greater the massage effect.

[0018] (C: Surfactant) In the present invention, a nonionic surfactant having an HLB value in the range of 5 to 13 is used as component (C). Here, "a nonionic surfactant having an HLB value in the range of 5 to 13" means one type of nonionic surfactant having an HLB value in the range of 5 to 13, a combination of multiple nonionic surfactants having HLB values ​​in that range, or a combination of multiple nonionic surfactants in which two or more types of nonionic surfactants with different HLB values ​​are combined to result in a weighted average HLB value in the range of 5 to 13.

[0019] The HLB is an index showing the balance between hydrophilicity and lipophilicity with a value ranging from 0 to 20, and the closer to 0, the higher the lipophilicity, and the closer to 20, the higher the hydrophilicity. Various calculation methods are known for calculating the HLB value, and the values ​​are described in catalogs provided by manufacturers. In this specification, the HLB value of a nonionic surfactant is the HLB value described in the manufacturer's catalog if the nonionic surfactant is a commercially available product, and if the nonionic surfactant is not a commercially available product, the value calculated by the Griffin method (HLB value = 20 x sum of formula weights of hydrophilic parts / molecular weight) described on page 307 of "Surfactant Handbook" (published by Sangyo Tosho Co., Ltd., 1960) is used.

[0020] If the HLB value of the nonionic surfactant is less than 5, even if makeup is applied to the skin with the cleansing cosmetic and then rinsed off with water or lukewarm water, it will not be thoroughly rinsed off due to poor compatibility with water, and no refreshing feeling will be obtained after rinsing. Conversely, if the HLB value exceeds 13, hydrophobic makeup will not be compatible with the cleansing cosmetic, and makeup removal will be insufficient. In particular, if the HLB value is in the range of 6 to 11, makeup removal and ease of rinsing are good. The nonionic surfactant of component (C) may be either solid or liquid, but the use of a nonionic surfactant that is liquid at 25°C will provide better performance in terms of makeup removal and ease of rinsing off.

[0021] Specific examples of nonionic surfactants having an HLB value of 5 to 13 used as component (C), and nonionic surfactants whose HLB value falls within the above range when used in combination, include polyglycerin 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-2 stearate and PEG-5 stearate; polyoxyethylene alkyl ethers such as ceteth-2, oleth-3, and steareth-6; fatty acid polyoxyethylene alkyl ethers such as steareth-6 stearate, laureth-8 isostearate, and steareth-12 stearate; Polyoxyethylene fatty acid glyceryl such as PEG-3 glyceryl isostearate, 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 oil such as PEG-15 hydrogenated castor oil isostearate and PEG-20 hydrogenated castor oil triisostearate; and the like. Other examples include sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene polyoxypropylene copolymer, ether of polyoxyethylene polyoxypropylene copolymer and long-chain alcohol, ether of polybutylene glycol polyglycerin copolymer and long-chain alcohol, and the like. Among them, polyoxyethylene fatty acid ester, polyoxyethylene fatty acid glyceryl, fatty acid polyoxyethylene hydrogenated castor oil, and fatty acid polyoxyethylene alkyl ether are preferably used from the viewpoint of makeup removal and ease of rinsing.

[0022] When the nonionic surfactant used as component (C) 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., and among these, a residue of a branched higher fatty acid that makes the nonionic surfactant liquid and has excellent oxidation stability is preferred, and an isostearic acid residue is particularly preferred.

[0023] Commercially available liquid nonionic surfactants for use as component (C) include, for example, Emalex RWIS-320 (PEG-20 hydrogenated castor oil triisostearate; manufactured by Nippon Emulsion Co., Ltd.; HLB 6), Emalex GWIS-305 (PEG-5 glyceryl triisostearate; manufactured by Nippon Emulsion Co., Ltd.; HLB 3), and Uniox GT-20IS (PEG-20 glyceryl triisostearate; manufactured by NOF Corporation; HLB 10.4), and commercially available products which are solid at 25°C include, for example, Emalex GWS-320 (PEG-20 glyceryl triisostearate; manufactured by Nippon Emulsion Co., Ltd.; HLB 8), Emalex SWS-12 (steareth-12 stearate; manufactured by Nippon Emulsion Co., Ltd.; HLB 8), and Emalex 608 (steareth-8; manufactured by Nippon Emulsion Co., Ltd.; HLB 9).

[0024] The amount of component (C) used is preferably 3 to 40% by mass, more preferably 4 to 35% by mass, even more preferably 5 to 30% by mass, and particularly preferably 7 to 25% by mass, of the total composition. The lower this amount is, the less irritation to the skin will be. Conversely, the higher the amount is, the easier it will be to remove makeup and wash off.

[0025] (D: Green tea powder) In the present invention, in addition to the above components (A) to (C), green tea powder (D) is used. When the component (D) is contained, the product feels soft on the skin and has a scrubbing effect that improves cleansing performance such as makeup removal and dirt removal. In addition, a vivid green color can be imparted to the cosmetic product without using synthetic dyes. Green tea is a type of tea made from tea plant leaves, and is produced by heat-treating picked tea leaves to prevent enzyme reactions in the tea leaves (called "fermentation" in the tea industry), and has a green (yellow-green to blue-green) color. In the present invention, green tea is not particularly limited as long as it is tea leaves produced by such a method, and includes, but is not limited to, sencha, gyokuro, kabusecha, bancha, tencha, matcha, etc. In the present invention, green tea powder refers to green tea in a powder form, and can be produced by using green tea as is or by pulverizing it. The volume average particle size is preferably 0.01 to 100 μm, more preferably 0.1 to 80 μm, and particularly preferably 1 to 50 μm. The green tea powder is preferably matcha, and commercially available matcha can be used as is or after pulverization and classification. Examples of commercially available matcha include Fukujuen Matcha (for cosmetics) sold by Fukujuen Co., Ltd. and Uji no Gocha M sold by Dai Nippon Kasei Co., Ltd. Here, the volume average particle size is measured using a laser diffraction / scattering particle size distribution measuring device (e.g., LA-950 manufactured by Horiba, Ltd.) and a sample that has been ultrasonically dispersed for 5 minutes using tri(caprylic / capric acid)glyceryl as a solvent, and does not refer to the primary particle size. The ultrasonic dispersion treatment is performed using an ultrasonic cleaner W-113 (manufactured by Honda Electronics Co., Ltd.) at a vibration frequency of 28 kHz.

[0026] The blending amount of component (D) is preferably 0.01 to 20 mass% of the total cosmetic, more preferably 0.1 to 15 mass%, and even more preferably 1 to 10 mass%. When component (D) is contained in this range, the dirt removal property and massage effect are improved, and the burden on the skin is reduced.

[0027] In the present invention, it is preferable that the composition further contains fumed silica as component (E). In order to manufacture a cleansing cosmetic from a composition containing solid oil, a process is required in which the composition in a uniformly mixed molten state is filled into a specified container, and then cooled and solidified. In the case of a composition containing green tea powder as component (D), if the composition filled into the container is solidified quickly, the dispersion state of the powder can be maintained uniformly. For example, makeup cosmetics such as lipstick generally weigh a few grams, so the time from filling to solidification is extremely short, and there is little risk of the dispersibility of the powders contained in the composition being impaired. However, in the case of cleansing cosmetics, the weight per product is generally about 100 grams or more, so even if the container filled with the composition is cooled from the outside with cold air or the like, it takes a long time to solidify, and during that time, the powders may settle or aggregate. In the case of green tea powder, it is easy to aggregate when dispersed in oil, so that it is easy to have a non-uniform appearance. By incorporating component (E), it is possible to obtain a cosmetic with a more uniform appearance.

[0028] The blending amount of component (E) is preferably 0.01 to 10 mass% of the total cosmetic, more preferably 0.1 to 5 mass%, and even more preferably 0.2 to 3 mass%. The mass ratio of component (E) to the green tea powder of component (D) [(E) / (D)] is preferably 0.01 to 10, more preferably 0.05 to 5. When the blending amount of component (E) is within the above range, the dispersion state of component (D) in the cosmetic material is improved, and aggregation of component (D) can be effectively suppressed when the blend is melt-filled in the manufacturing process of the cleansing cosmetic.

[0029] The fumed silica of component (E) is a fine amorphous silica also called fumed silica, and has a fluffy, light, white powder appearance. Fumed silica can be obtained, for example, by high-temperature hydrolysis of a raw material such as silicon tetrachloride in an oxyhydrogen flame. The specific surface area of ​​the fumed silica is preferably 30 m2 / g or more, more preferably 50 to 400 m2 / g, and particularly preferably 100 to 400 m2 / g. If the specific surface area is too small, it is not possible to effectively suppress the precipitation of component (D) when the blend is melt-filled in the manufacturing process of the cleansing cosmetic.

[0030] The primary particle size of these fumed silica particles is preferably 1 to 50 nm, and more preferably 2 to 30 nm. The primary particle size can be determined as the average value of 3,000 to 5,000 particles measured by an electron microscope photograph, and can be confirmed by a catalog of a fumed silica manufacturer. The component (E) may be untreated fumed silica exhibiting hydrophilicity, or may be fumed silica subjected to hydrophobic treatment. Specific examples of hydrophobic treatment include dimethyldichlorosilane treatment, trimethylsiloxy treatment with trimethylsilyl chloride or hexamethyldisilazane, octylsilane treatment, dimethylsilicone oil treatment, coating baking treatment using methylhydrogenpolysiloxane, and coating with metal soap. In order to suppress aggregation of component (D) and facilitate obtaining a more uniform appearance, it is preferable to contain both untreated and hydrophobized fumed silica, and the mass ratio of untreated fumed silica to hydrophobized fumed silica (untreated / hydrophobized ratio) is preferably 1 / 9 to 9 / 1.

[0031] Commercially available products of component (E) include untreated fumed silica such as AEROSIL 50, AEROSIL 130, AEROSIL 200, AEROSIL 200V, AEROSIL 200CF, AEROSIL 200FAD, AEROSIL 300, AEROSIL 300CF, AEROSIL 380, and AEROSIL 380S (all manufactured by Nippon Aerosil Co., Ltd.); and hydrophobically treated products such as AEROSIL R972, AEROSIL R972V, AEROSIL R972CF, AEROSIL R974, AEROSIL R976S, AEROSIL RX200, AEROSIL RX300, AEROSIL RY200, AEROSIL R202, AEROSIL R805, AEROSIL R812, and AEROSIL Examples include RA200H (both manufactured by Nippon Aerosil Co., Ltd.) and CAB-O-SIL TS530 (manufactured by Cabot Corporation).

[0032] In the oil-based solid cleansing cosmetic of the present invention, the water content is 1% by mass or less, preferably 0.5% by mass or less, and more preferably 0.3% by mass or less. If the water content falls within this range, the color tone of the (D) green tea powder will remain vivid and will not easily discolor.

[0033] The oil-based solid cleansing cosmetic of the present invention contains (D) green tea powder, which provides a scrubbing effect that is pleasant to the skin, and also provides an aesthetic effect of a vivid green color without the use of synthetic dyes. The external color tone of the oil-based solid cleansing cosmetic of the present invention is preferably a hue (H) of 7.5Y to 5G and a chroma (C) of 3 or more, more preferably a hue (H) of 10Y to 2.5G and a chroma (C) of 4 or more, in the Munsell color system. The hue (H) and chroma (C) can be evaluated by comparison with a Munsell color chart, and can also be determined by color measurement values ​​using a color difference meter (e.g., a color whiteness meter NW-12 manufactured by Nippon Denshoku Industries Co., Ltd.).

[0034] The oil-based solid cleansing cosmetic of the present invention contains tea leaf extract in addition to (D) green tea powder, so that users can enjoy the bright green color of green tea and the physiologically active effects of tea leaves. The tea leaf extract is preferably a green tea extract. The extraction solvent is not particularly limited and may be water-soluble or oil-soluble. As the physiologically active effects, it is preferable that the extract has antioxidant and anti-aging effects. Examples of commercially available products of tea leaf extract derived from green tea include tea extract (B)-BG and tea extract (O)-SQ, manufactured by Maruzen Pharmaceutical Co., Ltd.

[0035] The oil-based solid cleansing cosmetic of the present invention can contain components used in ordinary cosmetics, for example, additives such as powders other than component (D), dyes, oil-based gelling agents, oil-soluble resins, polyhydric alcohols, lower alcohols, ultraviolet absorbers, ultraviolet scattering agents, moisturizers, fragrances, antioxidants, preservatives, antifoaming agents, and various extracts, within the range that does not impair the effects of the present invention.

[0036] The oil-based solid cleansing cosmetic of the present invention does not exhibit fluidity at room temperature (25°C) and normal pressure (1 atm), and its shape is not particularly limited. Specific examples of the shape include stick-shaped, rod-shaped, plate-shaped, and molded by pouring into a container. These various cleansing cosmetics can be prepared according to a conventional method. For example, all raw materials are heated to above their melting point and mixed uniformly, and then poured in a molten state into a specified container such as a jar container, a metal dish, or a resin dish, and cooled or allowed to cool to form an oil-based solid cleansing cosmetic. It can also be filled into a stick container to form a stick shape.

[0037] The oil-based solid cleansing cosmetic of the present invention has the properties required for a massage cosmetic, that is, appropriate viscosity, slipperiness, and slipperiness persistence, in addition to the function of removing makeup. Therefore, it can be used as a massage cosmetic in addition to the oil-based solid cleansing cosmetic of the present invention. When using the oil-based solid cleansing cosmetic of the present invention, the makeup can be removed by applying the cosmetic to the makeup and then rinsing it off with water or lukewarm water. Therefore, when using a conventional oil-based solid cleansing cosmetic, it is possible to omit the face washing operation with a face wash such as soap, which was considered necessary after use. Of course, it can also be used as a cleansing agent to remove dirt such as sebum accumulated on skin without makeup. EXAMPLES

[0038] 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. In the following description, the blending amounts in the formulations are expressed as mass % relative to the total amount unless otherwise specified. The oil-based solid cleansing cosmetic compositions of the present invention in the following examples and comparative examples were evaluated as follows.

[0039] (Good at removing makeup, refreshing feeling after rinsing, no irritation during massage) A panel of 10 female members with experience in makeup applied a commercially available powder foundation (CEZANNE UV Foundation EX Plus, manufactured by CEZANNE Cosmetics) to their skin, then cleansed with the evaluation sample, and rated each item on a 5-point scale from 1 to 5 based on the evaluation criteria shown in (1) below. The average scores of the 10 evaluators were calculated, and the performance as a cleansing cosmetic was judged according to the 4-point judging criteria shown in (2) below.

[0040] (1) Evaluation criteria 5 points: Good 4 points: Fairly good 3 points: Neither 2 points: slightly bad 1 point: Bad

[0041] (2) Four-level evaluation criteria A: Average score is 4~5 B: Average score is 3 or more but less than 4 C: Average score is between 2 and 3 D: Average score is less than 2

[0042] (Uniformity of appearance) The sample filled in the jar was visually observed for color uniformity, and the presence or absence of color unevenness was judged according to the following criteria.

[0043] (Judgment criteria) A: It has a uniform color tone. B: When observed with a 5x magnifying glass, fine color irregularities can be seen. C: Fine color unevenness is observed with the naked eye. D: Dark and light green areas are clearly visible.

[0044] (color tone) The color tone of the sample filled in the jar container was compared with the Munsell color chart to determine the hue (H) and chroma (C) values.

[0045] (color stability) The sample filled in a jar was stored in a thermostatic chamber at 40°C for one month, and the change in hue was visually observed and rated according to the following criteria.

[0046] (Judgment criteria) A: There is no change in color. B: The green color becomes slightly lighter. C: Green is yellowish D: It turns brown.

[0047] Examples 1 to 4 and Comparative Examples 1 to 3 (Oil-based solid cleansing cosmetic) Oil-based solid cleansing cosmetics having the formulations shown in Table 1 were prepared according to the following manufacturing procedure. In these formulations, two types of nonionic surfactants with different HLB values ​​were used in combination as component (C), and the weighted average HLB value of the combination was 8.8. The obtained oil-based solid cleansing cosmetics were evaluated by the above-mentioned methods for ease of makeup removal, refreshing feeling after rinsing, lack of irritation during massage, uniformity of appearance, hue and saturation, and color stability. The evaluation results are shown in Table 1.

[0048] (Manufacturing Procedure) (1) Heat ingredients 1 to 8 shown in Table 1 to about 90°C and mix uniformly. (2) Add ingredients 9 to 17 to the mixture prepared in (1) above and mix uniformly at 90°C. (3) The mixture prepared in (2) above is poured into a jar container at 70°C while still in the molten state, and then allowed to cool to give an oil-based solid cleansing cosmetic.

[0049] [Table 1]

[0050] From the results in Table 1, it was found that the oil-based solid cleansing cosmetic of the present invention is excellent in performance as a cleansing cosmetic, such as good makeup removal, refreshing feeling after rinsing, and no irritation during massage, and is also excellent in aesthetics due to its vivid color tone and excellent color stability (Examples 1 to 4). In contrast, when the composition did not contain the green tea powder of component (D), the makeup removal and refreshing feeling performance was insufficient (Comparative Example 1), and when 1.5 mass% of water was contained, the color stability was significantly inferior (Comparative Example 2). Furthermore, when the composition contained clay, an inorganic mineral, instead of green tea powder, a irritating feeling was felt during the massage action to blend the makeup (Comparative Example 3). [Industrial Applicability]

[0051] According to the present invention, there is provided an oil-based solid cleansing cosmetic which has excellent cleansing performance, is gentle on the skin, and exhibits a vivid color tone due to the use of natural materials.

Claims

1. The oil-based solid cleansing cosmetic contains (A) a solid oil having a melting point of 50 to 120°C, (B) a liquid oil, (C) a nonionic surfactant having an HLB value of 5 to 13, and (D) green tea powder, and has a water content of 1% by mass or less (proportion of the total amount of the cosmetic).

2. An oil-based solid cleansing cosmetic composition comprising 1 to 30% by mass of component (A), 50 to 95% by mass of component (B), 3 to 30% by mass of component (C), and 0.01 to 20% by mass of component (D) (proportions relative to the total amount of the cosmetic composition).

3. 3. The oil-based solid cleansing cosmetic according to claim 1, wherein the average particle size of the green tea powder (D) is 0.01 to 100 μm.

4. 3. The oil-based solid cleansing cosmetic composition according to claim 1, further comprising (E) fumed silica.

5. 5. The oil-based solid cleansing cosmetic according to claim 4, wherein component (E) is fumed silica having a primary particle size of 1 to 50 nm.

6. 5. The oil-based solid cleansing cosmetic composition according to claim 4, wherein component (E) consists of untreated fumed silica and hydrophobically treated fumed silica.

7. 3. The oil-based solid cleansing cosmetic according to claim 1, wherein the color tone of the cosmetic has a hue (H) of 7.5Y to 5G and a chroma (C) of 3 or more in the Munsell color system.

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