Skin cleansing agent composition

Abstract

To provide a skin cleansing agent composition that has very high detergency and is able to adequately cleanse even strong stains, including mineral oil, animal and vegetable oils, and plant-derived scum, adhering to hands, fingers, or the like.SOLUTION: A skin cleansing agent composition according to the present disclosure is characterized by including a solvent (A), a surfactant (B), and an abrasive (C).SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a skin cleanser composition. [Background technology]

[0002] The market for skin cleanser compositions such as hand soaps and body soaps has been expanding in recent years. Here, it is desired that skin cleanser compositions can sufficiently clean even difficult-to-remove stains such as mineral oils, animal and vegetable oils, and plant-derived scum that adhere to the tips of the fingers and the grooves of fingerprints of people engaged in industry, agriculture, etc.

[0003] As a skin cleanser, for example, a skin cleanser characterized by dispersing water-floating inorganic hollow particles in an aqueous solution containing a surfactant, an oil remover, and an acrylic acid-methacrylic acid copolymer has been disclosed (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5756946 specification Summary of the Invention [Problem to be solved by the invention]

[0005] As described above, there is a demand for a skin cleanser composition that has an extremely excellent detergency and can sufficiently cleanse even stubborn stains such as mineral oil, animal and vegetable oils, and plant-derived scum that have stuck to hands and fingers.

[0006] The present invention has been made in view of the above-mentioned current situation, and an object of the present invention is to provide a skin cleanser composition that has an extremely excellent detergency and can sufficiently cleanse even stubborn stains such as mineral oil, animal and vegetable oils, and plant-derived scum that have stuck to hands and fingers. [Means for solving the problem]

[0007] As a result of intensive research into solving the above-mentioned problems, the present inventors have found that the above-mentioned problems can be successfully solved by a skin cleanser composition containing a solvent (A), a surfactant (B), and an abrasive (C), and have thus completed the present invention.

[0008] That is, the present invention (1) is a skin cleanser composition characterized by containing a solvent (A), a surfactant (B), and an abrasive (C).

[0009] The skin cleanser composition of the present invention has an excellent detergency due to the synergistic effect of the above three components, and can sufficiently cleanse even stubborn stains such as mineral oil, animal and vegetable oils, and plant-derived scum that have stuck to hands and fingers.

[0010] The present invention (2) is the skin cleansing composition of the present invention (1), in which the abrasive (C) is an organic abrasive.

[0011] When the abrasive (C) is an organic abrasive, the organic abrasive has a certain degree of biodegradability, which reduces the burden on the environment and, for example, sufficiently prevents the abrasive from accumulating in gutters and clogging drainage channels after use of the skin cleanser composition.

[0012] The present invention (3) is the skin cleanser composition of the present invention (1) or (2), wherein the content of the solvent (A) is 0.5 to 20 mass%, the content of the surfactant (B) is 0.5 to 20 mass%, and the content of the abrasive (C) is 0.1 to 15 mass%, based on 100 mass% of the composition.

[0013] The skin cleanser composition of the present invention (3) contains relatively small amounts of the solvent (A), surfactant (B), and abrasive (C), and therefore has low skin irritation and less of these substances are discharged into rivers, etc., thereby reducing the environmental impact. Furthermore, despite the low contents and economical nature of the composition, it has very high detergency and can sufficiently clean even stubborn stains such as mineral oil, animal and vegetable oils, and plant-derived scum.

[0014] The present invention (4) is the skin cleanser composition of any one of the present inventions (1) to (3), further comprising a thickener (D). The thickener (D) can increase the viscosity of the skin cleanser composition, prevent precipitation of the abrasive (C), and stabilize the skin cleanser composition.

[0015] The present invention (5) is a skin cleanser composition according to any one of the present inventions (1) to (4), which is a hand cleanser composition. The skin cleanser composition of any one of the present inventions (1) to (4) has excellent detergency and can more effectively clean stubborn stains such as mineral oil, animal and vegetable oils, and plant-derived scum that have stuck to hands and fingers, and is therefore highly suitable as a hand cleanser composition. [Effects of the Invention]

[0016] The skin cleanser composition of the present invention has an extremely excellent detergency and can sufficiently clean even stubborn stains such as mineral oil, animal and vegetable oils, and plant-derived scum adhering to hands and fingers.

[0017] The skin cleansing composition of the present invention is characterized by containing a solvent (A), a surfactant (B), and an abrasive (C).

[0018] The solvent (A), surfactant (B), and abrasive (C) that constitute the skin cleansing composition of the present invention will be described below.

[0019] The solvent (A) is usually an organic solvent, and examples thereof include alcohol-based solvents, paraffin-based solvents, glycol-based solvents, glycol ether-based solvents, and terpene-based solvents, and one or more of these can be used. For example, from the viewpoint of achieving better detergency, the solvent (A) is preferably an alcohol-based solvent, a paraffin-based solvent, a glycol ether-based solvent, or a terpene-based solvent, and more preferably a terpene-based solvent. Furthermore, from the viewpoint of further reducing skin irritation, the solvent (A) is preferably an alcohol-based solvent, a paraffin-based solvent, a glycol-based solvent, or a glycol ether-based solvent. Furthermore, from the viewpoint of achieving a good balance between excellent cleansing properties and low skin irritation, the solvent (A) is preferably an alcohol-based solvent, a paraffin-based solvent, or a glycol ether-based solvent.

[0020] Examples of alcohol solvents include benzyl alcohol, methanol, ethanol, 1-propanol, isopropanol, butanol, and the like, and one or more of these can be used.

[0021] Examples of the paraffin-based solvent include n-paraffins having 6 to 24 carbon atoms (preferably 8 to 24 carbon atoms), isoparaffins having 6 to 24 carbon atoms (preferably 8 to 24 carbon atoms), and liquid paraffins, and one or more of these can be used.

[0022] Examples of glycol solvents include ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, glycerin, butanediol, and hexanediol, and one or more of these can be used.

[0023] Examples of glycol ether solvents include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monopropyl ether, and diethylene glycol monobutyl ether, and one or more of these may be used.

[0024] Examples of terpene solvents include limonene, geraniol, nerol, linalool, α-terpineol, β-citronellol, etc., and one or more of these can be used.

[0025] The solvent (A) generally has 1 or more carbon atoms, preferably 4 or more carbon atoms, more preferably 5 or more carbon atoms, and even more preferably 6 or more carbon atoms. The solvent (A) preferably has 50 or less carbon atoms, more preferably 35 or less, and even more preferably 24 or less. In addition, liquid paraffin, a paraffin-based solvent, is also commonly found to have a carbon number of around 50.

[0026] The solvent (A) preferably has an SP value (solubility parameter) of 6 or more and 18 or less, more preferably 7 or more and 17 or less, and even more preferably 8 or more and 16 or less. From the viewpoint of further enhancing the detergency, the SP value is preferably 12.5 or less, and more preferably 12.0 or less.

[0027] The SP value (δ) is an index of the hydrophilicity of a solvent, and in this specification, is a value expressed as the square root of the molecular cohesive energy density as shown in the following formula. δ=[ΣE coh / ΣV] 1 / 2 ΣE coh represents the cohesive energy (cal / mol), and ΣV represents the molar volume (cm 3 / mol). The unit of SP value is (cal / cm 3 ) 1 / 2 All values ​​refer to values ​​at 25°C. The SP value is calculated according to the method described in RF Fedors, "A method for estimating both the solubility parameters and molar volumes of liquids," Polymer Engineering and Science, 14, p. 147 (1974) and Ueda et al. and two others, "Considerations on the solubility parameters of additives," Research on Paints, No. 152, October 2010.

[0028] The content of the solvent (A) is preferably 0.5 to 20% by mass in 100% by mass of the skin cleansing composition of the present invention. The content of the solvent (A) is more preferably 0.8% by mass or more from the viewpoint of further improving cleansing properties, and more preferably 15% by mass or less, and even more preferably 12% by mass or less, from the viewpoint of further reducing skin irritation. When a plurality of types of solvent (A) are contained, the content of the solvent (A) is defined as the total amount thereof.

[0029] The surfactant (B) is not particularly limited, but examples thereof include anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants.

[0030] Suitable anionic surfactants include alkyl ether carboxylates, alkanesulfonates, α-olefin sulfonates, α-sulfofatty acid methyl ester salts, alkylbenzenesulfonates, alkylsuccinates, alkyl sulfates, and alkyl ether sulfates.

[0031] The cationic surfactant is preferably a quaternary ammonium compound, and more preferably at least one selected from the group consisting of tetraalkylammonium salts, didecylmethylpolyoxyethylammonium salts, alkylbenzyldimethylammonium salts, cetylpyridinium salts, benzethonium salts, and alkyldimethylhydroxyethylammonium salts.

[0032] Examples of amphoteric surfactants include alkyl betaines, alkylamido betaines, alkyl sulfobetaines, imidazolinium betaines, and alkylamido sulfobetaines.

[0033] Examples of nonionic surfactants include polyoxyalkylene alkyl ethers, polyoxyalkylene alkylphenyl ethers, polyoxyalkylene fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, polyglycerin fatty acid esters, sorbitan fatty acid esters, sucrose fatty acid esters, alkyl polyglucosides, polyoxyethylene methyl ether fatty acid esters, fatty acid alkanolamides, polyoxyalkylene alkylamines, alkylamine oxides, and alkylamidoamine oxides.

[0034] When the surfactant is a salt, the salt is not particularly limited, but preferred examples include sodium salts, potassium salts, magnesium salts, calcium salts, and the like. These surfactants may be used in combination of two or more. Among these, from the viewpoint of achieving superior detergency, the surfactant (B) is preferably the above-mentioned anionic surfactant, amphoteric surfactant, or nonionic surfactant, more preferably anionic surfactant or nonionic surfactant, and from the viewpoint of increasing the viscosity and stabilizing the skin cleanser composition of the present invention, even more preferably a nonionic surfactant.

[0035] The content of the surfactant (B) in 100% by mass of the skin cleanser composition of the present invention is preferably 0.5 to 20% by mass. From the viewpoint of further improving the cleaning properties, the content of the surfactant (B) is more preferably 0.7% by mass or more. From the viewpoint of further reducing skin irritation, the content of the surfactant (B) is more preferably 15% by mass or less, even more preferably 12% by mass or less, and particularly preferably 10% by mass or less. When a plurality of types of surfactants (B) are contained, the content of the surfactants (B) is defined as the total amount thereof.

[0036] The mass ratio (B / A) of the surfactant (B) to the solvent (A) is preferably 0.05-20, more preferably 0.1-10.

[0037] The material of the abrasive (C) is not particularly limited, and abrasives of various materials such as organic abrasives such as natural polymers and resins, and inorganic abrasives can be used.

[0038] Examples of materials for the abrasive (C) include natural polymer abrasives such as glucomannan, cellulose, cellulose acetate, crystalline cellulose, starch (corn starch, potato starch, wheat starch, rice starch, tapioca starch, etc.), chitin, chitosan, and other polysaccharide particles; plant seed powders such as apricot kernels, peach kernels, olive kernels, and soybean flour (kinako); plant husk powders such as walnuts, peanuts, and sesame; protein powders such as casein; plant waxes such as carnauba wax and rice bran wax; corn cob powder; wood flour; and bamboo powder. Resin abrasives include particles of polylactic acid, polyethylene, polypropylene, polyvinyl chloride, polyester, polystyrene, polyurethane, ABS resin, urea resin, polycarbonate, polyamide, phenolic resin, epoxy resin, and wax. Inorganic abrasives include inorganic particles such as talc, silica, zeolite, pumice, and corundum. The abrasive (C) may be used alone or in combination of two or more kinds.

[0039] The abrasive (C) is preferably an organic abrasive in view of its low environmental impact. Organic abrasives are highly degradable when released into the environment, and can effectively prevent, for example, accumulation in drainage channels and clogging. More preferred organic abrasives include the aforementioned polysaccharide particles, plant seed powder, plant husk powder, protein powder, plant wax, corncob powder, wood flour, bamboo powder, and polylactic acid particles. These organic abrasives are particularly biodegradable. In other words, one preferred embodiment of the present invention is that the abrasive (C) is at least one selected from the group consisting of polysaccharide particles, plant seed powder, plant husk powder, protein powder, plant wax, corncob powder, wood flour, bamboo powder, and polylactic acid particles. The abrasive (C) may or may not be water-floating, but it is preferably not water-floating. Water floatability is determined by the true specific gravity and hygroscopicity, and is determined by whether or not the material floats when placed in water at room temperature.

[0040] A preferred embodiment of the present invention is one in which the abrasive (C) is a natural polymer-based abrasive. Another preferred embodiment of the present invention is one in which the abrasive (C) is a plant-derived abrasive or a food (including waste parts)-derived abrasive. In other words, another preferred embodiment of the present invention is one in which the abrasive (C) is a plant powder or a food (including waste parts) powder. Another preferred embodiment of the present invention is one in which the abrasive (C) is a biodegradable abrasive.

[0041] The abrasive (C) is usually used in the form of particles without being dissolved in the skin cleansing composition of the present invention. The average particle size of the abrasive (C) is preferably 20 to 600 μm. From the viewpoint of achieving superior detergency, the average particle size is more preferably 125 to 600 μm, and even more preferably 125 to 355 μm. The abrasive (C) is preferably one that has been rounded, which can sufficiently reduce physical irritation when used on the skin of fingers, etc. In terms of shape, the abrasive (C) is most preferably one having an average particle size of 125 to 355 μm and having been processed to remove corners.

[0042] The average particle size is determined by placing 100 g of sample on the top sieve (a standard sieve according to JIS Z 8801-1 [a combination of sieves with openings of 2000 to 20 μm]) and classifying it for 10 minutes using a sieving measuring device (AS200BASIC, Retsch). The weight of the sample remaining on each sieve is measured and plotted on normal probability paper. The particle size at which the ratio (cumulative weight%) of the cumulative weight to the total sample weight (100 g) is 50% is defined as the average particle size.

[0043] In 100% by mass of the skin cleanser composition of the present invention, the content of the abrasive (C) is preferably 0.1 to 15% by mass, more preferably 0.5 to 10% by mass, and even more preferably 0.5 to 8% by mass, based on the mass of the cleanser. By keeping the content of the abrasive (C) within this range, there is a tendency for the cleansing power to be further improved while suppressing physical irritation when used on the body. When multiple types of abrasives (C) are contained, the content of the abrasives (C) is defined as the total amount.

[0044] The mass ratio (C / A) of the abrasive (C) to the solvent (A) is preferably 0.01-20, more preferably 0.05-10.

[0045] The skin cleanser composition of the present invention preferably further contains a thickener (D). The thickener (D) is not particularly limited as long as it does not fall under the category of the above-mentioned solvent (A), surfactant (B), or abrasive (C) and has a thickening effect, and examples thereof include sodium chloride, carboxyvinyl polymer, acrylic acid / alkyl methacrylate copolymer, polyacrylic acid (salt), xanthan gum, carrageenan, guar gum, pectin, diutan gum, welan gum, glucomannan, etc. The polyacrylic acid (salt) is polyacrylic acid and / or a polyacrylic acid salt, and the salt is not particularly limited, but preferred examples include sodium salt, potassium salt, magnesium salt, etc. Among these, carboxyvinyl polymer, xanthan gum, polyacrylic acid (salt), carrageenan, guar gum, pectin, diutan gum, welan gum, glucomannan, etc. are preferred, and carboxyvinyl polymer is more preferred. The thickener (D) is usually dissolved in the skin cleansing composition of the present invention before use. Note that the thickener (D) does not include substances that correspond to the above-mentioned solvent (A), surfactant (B), and abrasive (C). Furthermore, glucomannan that is not dissolved in the skin cleanser composition of the present invention and is in particulate form is an abrasive (C), while glucomannan that is dissolved in the skin cleanser composition of the present invention is a thickener (D).

[0046] When the skin cleanser composition of the present invention contains a thickener (D), the content of the thickener (D) is preferably 0.01 to 10 mass%, more preferably 0.05 to 5 mass%, and even more preferably 0.1 to 3 mass%, relative to 100 mass% of the skin cleanser composition of the present invention. When the content of the thickener (D) is within the above range, the viscosity of the detergent composition is adjusted to an appropriate range. When a plurality of types of thickeners (D) are contained, the content of the thickeners (D) is defined as the total amount thereof.

[0047] The mass ratio (D / A) of the thickener (D) to the solvent (A) is preferably 0.01-5, more preferably 0.02-2.

[0048] The skin cleanser composition of the present invention may further contain a pH adjuster. Examples of pH adjusters include bases such as sodium hydroxide, potassium hydroxide, and ammonia; organic acids such as citric acid, succinic acid, and acetic acid; and inorganic acids such as hydrochloric acid and sulfuric acid. Note that the pH adjusters do not include the above-mentioned solvents (A), surfactants (B), abrasives (C), and thickeners (D).

[0049] The skin cleanser composition of the present invention preferably further contains water. The water is not particularly limited, but examples thereof include tap water, distilled water, purified water, pure water, ion-exchanged water, etc. In the cleanser composition of the present invention, the mass concentration of water is preferably 10 to 99.9 mass%, more preferably 40 to 99.5 mass%, even more preferably 70 to 99 mass%, and particularly preferably 80 to 98.5 mass%.

[0050] The skin cleanser composition of the present invention may contain, as other components, various additives such as chelating agents, antioxidants, colorants, fragrances, enzymes, and preservatives, in addition to the above-mentioned components.

[0051] The skin cleanser composition of the present invention preferably has a viscosity at 25°C of 10 mPa·s or more. From the viewpoint of more fully dispersing abrasives and the like, the viscosity is more preferably 100 mPa·s or more, even more preferably 1000 mPa·s or more, even more preferably 5000 mPa·s or more, even more preferably 10000 mPa·s or more, and particularly preferably 20000 mPa·s or more. The skin cleanser composition of the present invention is a liquid cleanser composition, but as described above, it includes a high-viscosity one. When the skin cleanser composition of the present invention has a high viscosity, the abrasives and the like can be more fully dispersed, and the effects of the present invention become more pronounced. From the viewpoint of facilitating the preparation of the skin cleansing composition of the present invention, the viscosity is preferably 70,000 mPa·s or less, and more preferably 50,000 mPa·s or less. The viscosity of the skin cleanser composition of the present invention can be measured at 25°C by the method described in the Examples.

[0052] The skin cleanser composition of the present invention preferably has a pH at 25°C of 2 or higher, more preferably 3 or higher, and even more preferably 4 or higher. The skin cleanser composition of the present invention preferably has a pH of 11 or less, more preferably 10 or less, and even more preferably 9 or less. The pH of the skin cleansing composition of the present invention is measured at 25°C by the method described in the examples.

[0053] The skin cleansing composition of the present invention can be produced by any method. For example, the solvent (A), surfactant (B), abrasive (C), and optionally thickener (D), and other ingredients may be added to a container and stirred to mix. Water is usually added to adjust the pH and viscosity of the skin cleanser composition.

[0054] The skin cleanser composition of the present invention is preferably used for cleansing human skin, and is preferably a hand cleanser composition, since it can sufficiently cleanse stubborn stains such as black oil stains that have become embedded in the tips of fingernails or in the grooves of fingerprints. Furthermore, the skin cleanser composition of the present invention can sufficiently cleanse even mineral oils, animal and vegetable oils, plant-derived scum, etc., and is therefore suitable for, for example, agricultural use (for agricultural workers) and industrial use (for factory workers). [Example]

[0055] The present invention will be specifically described based on examples, but the present invention is not limited to these examples. In the examples, "%" means "% by mass" unless otherwise specified.

[0056] (Examples 1 to 59, Comparative Examples 1 to 3) Cleaning compositions according to Examples 1 to 59 and Comparative Examples 1 to 3 were prepared according to the formulations shown in Tables 1 to 4. The manufacturers of the compounds in Tables 1 to 4 are as follows:

[0057] <(A) Solvent> Benzyl alcohol: Tokyo Ohka Kogyo Co., Ltd., benzyl alcohol S, SP value 12.0 Liquid paraffin: Liquid paraffin manufactured by Yoneyama Pharmaceutical Co., Ltd., SP value 8.0-8.1 Propylene glycol: ADEKA Cosmetic Propylene Glycol, SP value 15.9 Diethylene glycol monoethyl ether: CARBITOL manufactured by Dow Chemical Japan Co., Ltd. TM Solvent JSQI Personal Care Grade, SP value 10.9 Limonene: D-limonene manufactured by Nippon Terpene Chemical Co., Ltd., SP value 8.6 Geraniol: Fujifilm Wako Pure Chemical Industries, Ltd., geraniol, SP value 10.2 Nerol: Nerol manufactured by Tokyo Chemical Industry Co., Ltd., SP value 10.2 Linalool: Linalool manufactured by Tokyo Chemical Industry Co., Ltd., SP value 10.0 β-Citronellol: β-Citronellol manufactured by Tokyo Chemical Industry Co., Ltd., SP value 10.0

[0058] <(B) Surfactant> Polyoxyethylene lauryl ether: Brownon EL-1509P, EO 9 mol, manufactured by Aoki Oil & Fat Industries Co., Ltd. Polyoxyethylene tridecyl ether: Finesurf TD-100, manufactured by Aoki Oil & Fat Industries Co., Ltd., EO 10 mol Polyoxyethylene cetyl ether: Brownon CH-315L, EO 15 mol, manufactured by Aoki Oil & Fat Industries Co., Ltd. Polyoxyethylene stearyl ether: Brownon SR-711, manufactured by Aoki Oil & Fat Industries Co., Ltd., EO 11 mol Alkyl glucoside: GLUCOPON 650EC manufactured by BASF Japan Ltd. Coconut oil fatty acid N-methylethanolamide: Aminone C-11S manufactured by Kao Corporation Polyoxyethylene alkyl ether acetate sodium: Kao Akipo RLM-100NV manufactured by Kao Corporation Polyoxyethylene alkyl ether sodium sulfate: Teikapol NE1230 manufactured by Teika Corporation Sodium α-olefin sulfonate: Liporan LJ-441 manufactured by Lion Specialty Chemicals Co., Ltd. Sodium alkanesulfonate: HOSTAPUR SAS 30SB manufactured by Clariant Japan Coconut oil fatty acid amidopropyl betaine: GENAGEN CAB-818J manufactured by Clariant Japan Lauryl hydroxysulfobetaine: Kao Corporation, Amphitol 20HD Benzalkonium Chloride: Highamine 3500J manufactured by Arcsoda Japan Co., Ltd. Dimethyldioctylammonium Chloride: Bardac LF80 manufactured by Arcsoda Japan Co., Ltd. Didodecyldimethylammonium Methosulfate: Lipocard 210 - 80MSPG manufactured by Lion Specialty Chemicals Co., Ltd.

[0059] <(C) Abrasive> Anzu Seeds: AP Grid <spherical> G #60 - 80 manufactured by Ichimaru Pharcos Co., Ltd. Corn Cobs: CR Grid G #60 - 80 manufactured by Ichimaru Pharcos Co., Ltd. Peach Stones: PS Grid G #40 - 60 manufactured by Ichimaru Pharcos Co., Ltd. Teuchi Glume Grains: WN Grid G #40 - 60 manufactured by Ichimaru Pharcos Co., Ltd. Crystalline Cellulose: CELLULOBEADS MC200 manufactured by Daito Kasei Kogyo Co., Ltd. Olive Seeds: SCRUBAMI OLIVE200 / 300 manufactured by ALBAN MULLER INTERNATIONAL Pumice Stone: Rhyolite Exfoliator 200 manufactured by Lessonia Rice Powder: Rice Exfoliator 500 manufactured by Lessonia Cellulose Acetate: Celluloscrub manufactured by Lessonia TM 300 PE Powder: Microscrub 35PC manufactured by Prospector, polyethylene beads with an average particle diameter of 350μm

[0060] <(D) Thickening Agent> Carboxyvinyl Polymer: AQUPECHV - 505ED manufactured by Sumitomo Seika Chemicals Co., Ltd. Sodium Polyacrylate: Aqualic FH - S manufactured by Nippon Shokubai Co., Ltd. Xanthan Gum: Kelzan AR manufactured by Sankyo Co., Ltd. Cationized Guar Gum: JAGUAR C162 manufactured by Sankyo Co., Ltd.

[0061] <pH Adjusting Agent> Tosoh Pearl (granular caustic soda) manufactured by Tosoh Corporation The composition values ​​in Tables 1 to 4 represent the proportion of the pure content of each component in the detergent composition.

[0062] [Table 1]

[0063] [Table 2]

[0064] [Table 3]

[0065] [Table 4]

[0066] <ph> The pH of the undiluted solution of each of the skin cleanser compositions according to the Examples and Comparative Examples was measured at 25°C using a pH meter F-53 (manufactured by Horiba, Ltd.) in accordance with JIS Z-8802:2011 "pH measurement method."

[0067] <Viscosity> The viscosity of the undiluted solution of each of the skin cleansing compositions according to the Examples and Comparative Examples was measured using a viscometer VISCOMETER TV-10 (manufactured by Toki Sangyo Co., Ltd.) at 25° C., rotor No. 4, and a rotation speed of 5 rpm.

[0068] <Cleaning power against mineral oil> (Test Method) (1) White petrolatum (reagent grade, manufactured by Yoneyama Pharmaceutical Co., Ltd.):carbon black (reagent grade, manufactured by Yoneyama Pharmaceutical Co., Ltd.) are mixed in a weight ratio of 10:1 to prepare artificial dirt. (2) After washing and drying the hands of the subject, 0.2 g of artificial dirt is applied to the hands and spread evenly over both palms. (3) Wet your hands with water and place 3 g of each skin cleanser composition of the Examples and Comparative Examples on them, then massage your hands for 15 seconds (rubbing back and forth until your fingertips are between the first and second joints of your fingers, 2 times per second). (4) Rinse with running water for 15 seconds and visually evaluate the degree of removal of artificial dirt.

[0069] The evaluation criteria were as follows: The results are shown in Tables 1 to 4. ◎: Particularly good at removing dirt ○: Good dirt removal △: Slightly good at removing dirt ×: Poor stain removal Furthermore, if the rating is ◎, ○, or △, the cleaning power is good.

[0070] <Cleaning power against vegetable oil> (Test Method) (1) Nisshin refined soybean oil (manufactured by Nisshin Oillio Group, Ltd.): Nisshin canola oil (manufactured by Nisshin Oillio Group, Ltd.): carbon black (manufactured by Yoneyama Pharmaceutical Industry Co., Ltd., reagent grade) were mixed in a weight ratio of 12:12:1 to prepare artificial soiling. (2) After washing and drying the hands of the subject, 0.2 g of artificial dirt is applied to the hands and spread evenly over both palms. (3) Wet your hands with water and place 3 g of each skin cleanser composition of the Examples and Comparative Examples on them, then massage your hands for 15 seconds (rubbing back and forth until your fingertips are between the first and second joints of your fingers, 2 times per second). (4) Rinse with running water for 15 seconds and visually evaluate the degree of removal of artificial dirt.

[0071] The evaluation criteria were as follows: The results are shown in Tables 1 to 4. ◎: Particularly good at removing dirt ○: Good dirt removal △: Slightly good at removing dirt ×: Poor stain removal Furthermore, if the rating is ◎, ○, or △, the cleaning power is good.

[0072] <Cleaning power against animal oils> (Test Method) (1) Chicken oil (manufactured by Sanukitori Honpo Co., Ltd.): beef tallow (manufactured by Yoneyama Pharmaceutical Co., Ltd.): carbon black (manufactured by Yoneyama Pharmaceutical Co., Ltd., reagent grade) were mixed in a weight ratio of 12:12:1 to prepare artificial soiling. (2) After washing and drying the hands of the subject, 0.2 g of artificial dirt is applied to the hands and spread evenly over both palms. (3) Wet your hands with water and place 3 g of each skin cleanser composition of the Examples and Comparative Examples on them, then massage your hands for 15 seconds (rubbing back and forth until your fingertips are between the first and second joints of your fingers, 2 times per second). (4) Rinse with running water for 15 seconds and visually evaluate the degree of removal of artificial dirt.

[0073] The evaluation criteria were as follows: The results are shown in Tables 1 to 4. ◎: Particularly good at removing dirt ○: Good dirt removal △: Slightly good at removing dirt ×: Poor stain removal Furthermore, if the rating is ◎, ○, or △, the cleaning power is good.

[0074] <Cleaning power against plant-derived scum> (Test Method) (1) Prepare cloth work gloves that are stained with scum from farm work in a tomato farm. The gloves are made of nylon and have a polyurethane non-slip surface on the palm. The tomato scum has accumulated and become sticky, turning the surface black. The palm side is cut into a 3cm x 3cm square to create a test cloth. (2) A test cloth is wetted with 0.5 g of water, and 0.3 g of each of the skin cleansing compositions according to the Examples and Comparative Examples is placed on the test cloth. (3) Rub from one edge to the other edge 10 times on each of the four sides, for a total of 40 scrubs, and then visually evaluate the cleaning power.

[0075] The evaluation criteria were as follows: The results are shown in Tables 1 to 4. ◎: Particularly good at removing dirt ○: Good dirt removal △: Slightly good at removing dirt ×: Poor stain removal Furthermore, if the rating is ◎, ○, or △, the cleaning power is good.

[0076] <Skin irritation> (Test Method) When testing the cleansing power against mineral oil, sensory evaluation was conducted on the feeling of tightness on the skin and irritation caused by the abrasive.

[0077] The evaluation criteria were as follows: The results are shown in Tables 1 to 4. ○: Almost no tightness, little irritation from abrasives △: Slight tightness, normal abrasive irritation ×: Feels tight and abrasive, irritating If the rating is ○ or △, the skin irritation is good.

[0078] From the results of the above-mentioned Examples, it was found that the skin cleanser compositions of the Examples can sufficiently clean even extremely difficult-to-remove stains such as mineral oil, animal and vegetable oils, and plant-derived scum, and have extremely excellent detergency. The skin cleanser compositions of Examples 11 and 26 to 34 had low viscosity, so the abrasive did not disperse sufficiently in the composition, and they were poor in stability. However, their cleaning power was sufficiently good, and they were able to exhibit the effects of the present invention.< / ph>

Claims

1. A solvent (A), a surfactant (B); A skin cleanser composition comprising an abrasive (C).

2. 2. The skin cleansing composition according to claim 1, wherein the abrasive (C) is an organic abrasive.

3. 3. The skin cleanser composition according to claim 1, wherein, based on 100% by mass of the composition, the content of the solvent (A) is 0.5 to 20% by mass, the content of the surfactant (B) is 0.5 to 20% by mass, and the content of the abrasive (C) is 0.1 to 15% by mass.

4. The skin cleanser composition according to claim 1 or 2, further comprising a thickener (D).

5. 3. The skin cleanser composition according to claim 1, which is a hand cleanser composition.

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