Skin cosmetics

Abstract

To provide a skin cleansing agent that contains a scrubbing agent to provide a highly effective massage with minimal irritation, excellent skin cleansing properties, and leaves the skin feeling moisturized and smooth after rinsing. [Solution] Components (A) to (D): (A) Liquid oil at 25°C, 20% to 70% by mass, (B) Fatty acids having 10 to 22 carbon atoms or salts thereof, (C) Anionic surfactants (excluding fatty acids with 10 to 22 carbon atoms or their salts), and (D) Cellulose 3% to 10% by mass A skin cleansing product containing [a specific ingredient / component].

Description

Technical Field

[0001] The present invention relates to a skin cleansing agent.

Background Art

[0002] Scrubbing agents have been incorporated into skin cleansing agents for the purpose of removing dirt on the skin and moderately massaging the skin to make it smooth. In order to enhance the effect of making the skin smooth, hard scrubbing agents such as polyethylene beads and walnut shell particles were required. However, when using hard scrubbing agents, the irritation was likely to increase and it was difficult to continue using them. On the other hand, when using soft scrubbing agents such as glucomannan, the irritation was less likely to be felt, but it was difficult to obtain a feeling of smooth skin.

[0003] When rinsing off the scrubbing agent, a dosage form with a high content of anionic surfactants such as fatty acid salts with high detergency is advantageous. Although a refreshing feeling can be easily obtained after rinsing, the skin tends to be dry (Patent Documents 1 and 2). In order to enhance the moisturizing effect, it is desirable to incorporate an oil agent, but when an oil agent is incorporated, the detergency decreases (Patent Document 3).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present invention is to provide a skin cleansing agent that contains a scrubbing agent, has a high massaging property with little irritation, is excellent in skin detergency, and is excellent in the moist feeling and smoothness of the skin after rinsing. [Means for solving the problem]

[0006] Therefore, the inventors have discovered that by incorporating a large amount of cellulose as a scrubbing agent, using a fatty acid or its salt in combination with an anionic surfactant, and incorporating a large amount of liquid oil, a skin cleanser can be obtained that provides high massage properties with minimal irritation, excellent skin cleansing properties, and leaves the skin moisturized after rinsing, thus completing the present invention.

[0007] In other words, one aspect of the present invention comprises the following components (A) to (D): (A) Liquid oil at 25°C, 20% to 70% by mass, (B) Fatty acids having 10 to 22 carbon atoms or salts thereof, (C) Anionic surfactants (excluding fatty acids with 10 to 22 carbon atoms or their salts), and (D) Cellulose 3% to 10% by mass This is a skin cleansing product containing [ingredient name]. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a skin cleansing agent that offers high massage properties with minimal irritation, excellent skin cleansing properties, and superior moisturizing and smoothing effects on the skin after rinsing. [Modes for carrying out the invention]

[0009] Terms used herein shall be used in the sense commonly used in the art unless otherwise specified.

[0010] One aspect of the present invention is the following components (A) to (D): (A) Liquid oil at 25°C, 20% to 70% by mass, (B) Fatty acids having 10 to 22 carbon atoms or salts thereof, (C) Anionic surfactants (excluding fatty acids with 10 to 22 carbon atoms or their salts), and (D) Cellulose 3% to 10% by mass This is a skin cleansing product containing [ingredient name].

[0011] The component (A) of the present invention, a liquid oil at 25°C, is added to the skin cleansing composition of the present invention to improve the moisturizing effect and smoothness of the skin after rinsing. The liquid oil at 25°C is not particularly limited as long as it is an oil commonly used in cosmetics and has fluidity at room temperature (25°C), and examples include one or more selected from ester oils, hydrocarbon oils, ether oils, silicone oils, and higher alcohols. Examples of ester oils include synthetic ester oils such as isononyl isononanoate, isodecyl isononanoate, isotridecyl isononanoate, isopropyl isostearate, cetyl 2-ethylhexanoate, isopropyl myristate, isocetyl myristate, octyldodecyl myristate, isostearyl myristate, isopropyl palmitate, octyl palmitate, isostearyl palmitate, caprylic / capric triglyceride, glyceryl tri-2-ethylhexanoate, cholesteryl isostearate, neopentyl glycol dicaprate, and neopentyl glycol dioctanoate, as well as vegetable oils such as castor oil, jojoba oil, sunflower oil, and olive oil, and animal oils. Examples of hydrocarbon oils include liquid paraffin, squalane, vegetable squalane, volatile isoparaffin, and α-olefin oligomers. Examples of ether oils include cetyl-1,3-dimethylbutyl ether, dicapryl ether, dilauryl ether, and diisostearyl ether. Examples of silicone oils include volatile and non-volatile linear dimethylpolysiloxanes such as dimethylpolysiloxane (1cs), dimethylpolysiloxane (1.5cs), dimethylpolysiloxane (2cs), and dimethylpolysiloxane (6cs); branched siloxanes such as methyl trimethicone and tris(trimethylsilyl)methylsilane; cyclic dimethylsiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane; and methylphenylpolysiloxanes such as diphenylsiloxyphenyl trimethicone. Examples of higher alcohols include branched or unsaturated higher alcohols with 12 to 24 carbon atoms, such as 2-octyldodecanol, isostearyl alcohol, and oleyl alcohol. In the present invention, one or more of these liquid oils at 25°C can be used.

[0012] The content of component (A) in the skin cleansing composition of the present invention is preferably 20% by mass or more and 70% by mass or less in the total composition, from the viewpoint of enhancing smoothness during application, lack of irritation during application, and massage effect when spread on the skin, as well as improving the moisturizing effect and smoothness of the skin after rinsing. From the same viewpoint, the content of component (A) is more preferably 25% by mass or more, even more preferably 30% by mass or more, even more preferably 35% by mass or more, even more preferably 40% by mass or more, more preferably 65% ​​by mass or less, and even more preferably 60% by mass or less. Specifically, it is more preferably 25% by mass or more and 65% by mass or less, more preferably 30% by mass or more and 65% by mass or less, even more preferably 35% by mass or more and 60% by mass or less, and even more preferably 40% by mass or more and 60% by mass or less.

[0013] Component (B) of the present invention, a fatty acid having 10 to 22 carbon atoms or a salt thereof, is incorporated in the skin cleansing composition of the present invention as a component to improve the stability of the emulsion and to provide a refreshing feeling to the skin after rinsing. (B) Fatty acids having 10 to 22 carbon atoms or salts thereof are preferred, and fatty acids having linear or branched alkyl or alkenyl groups with 9 to 21 carbon atoms or salts thereof are preferred. Examples of these fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, arachidic acid, and behenic acid, and it is preferable to include at least one selected from lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, behenic acid and salts thereof, and it is more preferable to include at least one selected from myristic acid, palmitic acid, stearic acid, behenic acid and salts thereof. Examples of these salts include alkali metals such as sodium and potassium; ammonium; ammonium derived from alkanolamines such as monoethanolamine, diethanolamine, and triethanolamine; and basic amino acids such as arginine and lysine. Among these, it is preferable to include at least one selected from sodium, potassium, ammonium, and arginine.

[0014] The content of component (B) in the skin cleansing composition of the present invention is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, even more preferably 0.3% by mass or more, and even more preferably 0.5% by mass or more, from the viewpoint of improving the stability of the emulsion and improving the cleansing properties of the skin. Also, from the same viewpoint, it is preferably 2% by mass or less, more preferably 1.8% by mass or less, even more preferably 1.5% by mass or less, and even more preferably 1.2% by mass or less. Specifically, it is preferably 0.1% by mass or more and 2% by mass or less, more preferably 0.2% by mass or more and 1.8% by mass or less, even more preferably 0.3% by mass or more and 1.5% by mass or less, and even more preferably 0.5% by mass or more and 1.2% by mass or less. Furthermore, the mass ratio (A / B) of component (A) to component (B) is preferably between 10 and 700, from the viewpoint of improving the moisturizing effect and smoothness of the skin after rinsing. This mass ratio is more preferably 12 or higher, even more preferably 13 or higher, even more preferably 15 or higher, even more preferably 250 or lower, even more preferably 200 or lower, and even more preferably 150 or lower. Specifically, it is preferably 12 to 250, more preferably 13 to 200, even more preferably 14 to 150, and even more preferably 15 to 100.

[0015] The component (C) of the present invention, an anionic surfactant (excluding fatty acids having 10 to 22 carbon atoms or their salts), is incorporated into the skin cleansing composition of the present invention to enhance the cleansing properties of the skin and the ease of rinsing during cleansing. The anionic surfactant of component (C) is other than the salt of component (B) and may be any one used in ordinary skin cleansers. For example, alkylbenzene sulfonates, alkane sulfonates, alkenyl sulfonates, alkyl sulfonates, acyl isethionates, alkyl sulfate esters, alkyl ether sulfate esters, alkyl sulfosuccinates, sulfofatty acid methyl ester salts, fatty acid alkanolamide sulfate esters, monoacyl glycerin sulfate esters, alkyl phosphate esters, polyoxyethylene alkyl ether phosphates, alkyl aryl ether phosphates, fatty acid amide ether phosphates, ether carboxylic acids or their salts, N-acyl amino acid salts, etc. may be mentioned. Among these, from the viewpoints of enhancing the rinsing property during washing and improving the smoothness of the skin, it is preferable to contain at least one selected from alkyl sulfate esters, alkyl ether sulfate esters, ether carboxylic acids or their salts, N-acyl amino acid salts, and sulfonate-type anionic surfactants, and it is preferable to contain at least one selected from ether carboxylic acids or their salts, N-acyl amino acid salts, and sulfonate-type anionic surfactants.

[0016] Examples of the ether carboxylic acid or its salt include polyoxyethylene carboxylic acids or their salts having an alkyl group or alkenyl group with 10 to 22 carbon atoms. Specifically, it is preferable to contain one or more selected from polyoxyethylene lauryl ether carboxylic acid or its salt, polyoxyethylene myristyl ether carboxylic acid or its salt, and polyoxyethylene palmityl ether carboxylic acid or its salt. It is preferable to contain one or two selected from polyoxyethylene lauryl ether carboxylic acid or its salt and polyoxyethylene myristyl ether carboxylic acid or its salt, and it is more preferable to contain polyoxyethylene lauryl ether carboxylic acid or its salt. Moreover, as commercially available products of such ether carboxylic acids or their salts, for example, AKY PO RLM 45CA (manufactured by Kao Corporation) and the like may be mentioned.

[0017] As the N-acyl amino acid salt, an N-acyl amino acid salt having an acyl group with 10 to 22 carbon atoms, more preferably 12 to 18 carbon atoms, is preferred. The acyl amino acid salt contributes to the stabilization of the emulsion system and particularly acts effectively in suppressing curing at low temperatures. It also imparts excellent rinsing properties. Specifically, N-acyl glutamate salts such as sodium N-lauroyl glutamate, triethanolamine N-lauroyl glutamate, sodium N-myristoyl glutamate, triethanolamine N-myristoyl glutamate, sodium N-palmitoyl glutamate, triethanolamine N-palmitoyl glutamate, sodium N-stearoyl glutamate, sodium N-oleoyl glutamate, disodium N-palmitoyl glutamate; N-acyl aspartate salts such as sodium N-lauroyl aspartate, triethanolamine N-lauroyl aspartate, sodium N-myristoyl aspartate, triethanolamine N-myristoyl aspartate, triethanolamine N-acyl (coconut oil fatty acid) aspartate; N-acyl glycine salts such as sodium N-lauroyl glycine, triethanolamine N-lauroyl glycine, sodium N-myristoyl glycine, triethanolamine N-myristoyl glycine, potassium N-acyl (coconut oil fatty acid) glycine, specifically potassium N-coconut oil fatty acid acyl glycine; other N-acyl methyl taurine salts, specifically sodium N-stearoyl-L-methyl taurine, N-acyl methyl alanine salts, N-acyl sarcosine salts, etc. Among these, N-acyl glutamate salts are preferred because they further contribute to the stabilization of the emulsion system. Such N-acyl glutamate salts can be commercially available products, for example, Amisoft HS-11P, Amisoft LK-11, Amisoft LS-11, Amisoft LT-12, Amisoft CT-12 (all manufactured by Ajinomoto Co., Inc.), etc.

[0018] Examples of the sulfonate type anionic surfactant include alkylbenzene sulfonate, α-olefin sulfonate, alkyl sulfosuccinate, alkyl allyl sulfosuccinate, and the like.

[0019] The content of component (C) in the skin cleansing composition of the present invention is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, even more preferably 0.5% by mass or more, and even more preferably 0.7% by mass or more, from the viewpoint of improving rinsability during cleansing and improving skin smoothness. Also, from the same viewpoint, it is preferably 2% by mass or less, more preferably 1.8% by mass or less, even more preferably 1.5% by mass or less, and even more preferably 1.2% by mass or less. Specifically, it is preferably 0.1% by mass or more and 2% by mass or less, more preferably 0.3% by mass or more and 1.8% by mass or less, even more preferably 0.5% by mass or more and 1.5% by mass or less, and even more preferably 0.7% by mass or more and 1.2% by mass or less. Furthermore, the mass ratio (A / C) of component (A) to component (C) is preferably between 10 and 700, from the viewpoint of improving the cleansing properties of the skin, the moisturizing effect on the skin after rinsing, and the smoothness of the skin. This mass ratio is more preferably 11 or higher, even more preferably 12 or higher, even more preferably 13 or higher, even more preferably 700 or lower, even more preferably 250 or lower, and even more preferably 100 or lower. Specifically, it is preferably 11 to 250, more preferably 12 to 200, even more preferably 13 to 100, and even more preferably 16 to 90.

[0020] Component (D) cellulose of the present invention is incorporated as a scrubbing agent in the skin cleansing product of the present invention. Because it is less irritating to the skin, even when incorporated in large quantities, it does not cause irritation during massage, and allows for the efficient removal of old dead skin cells. By efficiently removing old dead skin cells, the skin becomes smooth and soft. Both powdered cellulose and crystalline cellulose can be used as cellulose. It is desirable that the cellulose be in a scrub-like form to enhance its effect during massage, and furthermore, a scrub-like form that disintegrates is preferable from the standpoint of being gentle on the skin. A scrub-like form refers to a state in which the substance has a certain particle size due to aggregation and is in a state of water-insoluble particles. It can also refer to granulated particles in which water-insoluble particles are used as primary particles and multiple particles are bound together with a binder. Examples of binders include synthetic products such as polyvinyl alcohol and / or its derivatives, alkali salts of poly(meth)acrylate, alkali salts of (meth)acrylate ester copolymers, alkali salts of acrylic acid / maleic acid copolymers, alkali salts of maleic acid / vinyl alcohol copolymers, and polyvinylpyrrolidone; semi-synthetic products such as methylcellulose, ethylcellulose, carboxymethylcellulose, hydroxyalkylcellulose, and starch derivatives; and natural polymers such as starch, seaweed, plant mucilage, and protein. Among these, it is preferable to use starch, an alkali salt of maleic acid / vinyl alcohol copolymer, and polyvinyl alcohol and / or its derivatives as binders, from the viewpoint of reducing skin irritation and improving storage stability at high temperatures. Furthermore, the particle size of the cellulose scrub used is preferably between 100 μm and 700 μm, as this allows for a non-irritating massage and efficient removal of old dead skin cells. More preferably, the particle size is 110 μm or larger, even more preferably 120 μm or larger, even more preferably 150 μm or larger, even more preferably 700 μm or smaller, even more preferably 600 μm or smaller, even more preferably 550 μm or smaller, and particularly preferably 500 μm or smaller. Specifically, 110 μm to 600 μm is preferred, 120 μm to 550 μm is more preferred, and 150 μm to 500 μm is even more preferred.

[0021] In the skin cleansing composition of the present invention, the content of component (D) cellulose is preferably 3% by mass or more and 10% by mass or less in the total composition, from the viewpoint of improving massage properties, reducing irritation, efficient removal of old keratin, and improving skin smoothness. From the same viewpoint, the content of component (D) is more preferably 3.5% by mass or more, even more preferably 4% by mass or more, even more preferably 4.5% by mass or more, even more preferably 5% by mass or more, more preferably 9% by mass or less, and even more preferably 8% by mass or less. Specifically, 3.5% by mass or more and 9% by mass or less is more preferable, 4% by mass or more and 8% by mass or less is more preferable, 4.5% by mass or more and 8% by mass or less is even preferable, and 5% by mass or more and 8% by mass or less is even more preferable. Furthermore, the mass ratio (A / D) of component (A) to component (D) is preferably between 2 and 23, from the viewpoint of improving massageability, reducing irritation, efficient removal of old dead skin cells, and improving the moisturizing and smooth feeling of the skin after rinsing. This mass ratio is more preferably 3 or higher, even more preferably 4 or higher, even more preferably 5 or higher, even more preferably 23 or lower, even more preferably 22 or lower, and even more preferably 20 or lower. Specifically, it is preferably 2 to 23, more preferably 3 to 23, even more preferably 4 to 22, and even more preferably 5 to 20.

[0022] In addition to the above-mentioned components, the skin cleansing composition of the present invention may contain water, solid oil (solid oil other than component (B)), nonionic surfactant, polyhydric alcohol, thickener, scrubbing agent other than component (D), chelating agent such as EDTA, whitening agent, blood circulation promoter, anti-inflammatory agent, bactericide, UV absorber, texture enhancer, colorant, preservative, antioxidant, fragrance, plant or animal extract, etc.

[0023] Examples of solid oils include oils that do not have fluidity at room temperature (25°C), such as semi-solid oils, waxes, and higher alcohols. Examples of semi-solid oils include petrolactam, cholesterol derivatives, phytosterol derivatives, hydrogenated castor oil derivatives, and erythritol fatty acid esters. More specifically, examples include petrolatum, long-chain branched fatty acid (12-31) cholesteryl, macadamia nut oil fatty acid phytosteryl, hydrogenated castor oil isostearate, hydrogenated castor oil monohydroxystearate, and dipentaerythritol hexaoxystearate. Examples of waxes include animal waxes, vegetable waxes, mineral waxes, and synthetic waxes. More specifically, examples of ester waxes include rice bran wax, carnauba wax, candelilla wax, beeswax, and gypsum wax, while examples of hydrocarbon waxes include ceresin, paraffin wax, microcrystalline wax, polyethylene wax, and polyolefin wax. Examples of higher alcohols include myristyl alcohol, cetyl alcohol, stearyl alcohol, cetostearyl alcohol, behenyl alcohol, cholesterol, and phytosterols. Cetyl alcohol, stearyl alcohol, and cetostearyl alcohol are more preferred in terms of smoothness during application. These solid oils can be contained in the total composition of the skin cleanser of the present invention at a concentration of 0.01% to 10% by mass.

[0024] Examples of nonionic surfactants include monoglyceryl fatty acids such as glyceryl monostearate, hydrogenated castor oil monohydroxystearate, and sorbitan fatty acids such as polyoxyethylene sorbitan tristearate. These nonionic surfactants can be included in the total composition of the skin cleanser of the present invention at an amount of 0.01% to 10% by mass in order to provide good emulsification and dispersion and easy rinsing.

[0025] Examples of polyhydric alcohols include glycerin, ethylene glycol, polyethylene glycol (average molecular weight of 10,000 or less), propylene glycol, polypropylene glycol, isoprene glycol, propanediol, 1,3-butylene glycol, dipropylene glycol, diglycerin, polyglycerin, trehalose, glucosyltrehalose, xylitol, fructose, lactose, trimethylglycine, sorbitol, and maltitol. These polyhydric alcohols are effective in providing high cleansing efficacy, excellent rinsability, and a moisturizing effect on the skin after rinsing. They can be contained in the total composition of the skin cleanser of the present invention at a concentration of 0.01% to 20% by mass.

[0026] Examples of thickening agents include carrageenan, dextrin, methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, polyvinyl alcohol, polyacrylic acid, sodium polyacrylate, methacrylic acid, carboxyvinyl polymer, xanthan gum, carboxymethyl chitin, chitosan, cationized cellulose and other polymer compounds, as well as inorganic compounds such as magnesium aluminum silicate and bentonite.

[0027] The dosage form of the skin cleansing agent of the present invention is preferably an emulsion, and a creamy form is preferable from the viewpoint of smoothness during application, lack of irritation during application, and massage effect when spread on the skin. From a similar viewpoint, the creamy skin cleansing agent of the present invention preferably has a viscosity at 20°C of 18,000 mPa·s to 200,000 mPa·s, more preferably 19,000 mPa·s to 190,000 mPa·s, and even more preferably 20,000 mPa·s to 180,000 mPa·s. Here, "creamy" refers to a viscous, emulsified form, and it is preferable that the viscosity at 20°C is between 18,000 mPa·s and 200,000 mPa·s. Furthermore, the skin cleansing agent of the present invention is intended for the cleansing of the skin, and is preferably intended for the cleansing of the face, hands, body, and feet. The skin cleansing composition of the present invention can be obtained by appropriately mixing predetermined components according to conventional methods, and can be manufactured by uniformly mixing and dispersing all components regardless of the order in which they are mixed. The skin cleansing composition of the present invention is preferably used by applying it to the face, hands, body, feet, etc., and then rinsing it off.

[0028] Next, preferred embodiments of the present invention will be illustrated. <1> The following ingredients (A) to (D): (A) Liquid oil at 25°C, 20% to 70% by mass, (B) Fatty acids having 10 to 22 carbon atoms or salts thereof, (C) Anionic surfactants (excluding fatty acids with 10 to 22 carbon atoms or their salts), and (D) Cellulose 3% to 10% by mass A skin cleansing product containing [a specific ingredient / component]. <2> Component (A) is one or more selected from ester oils, hydrocarbon oils, ether oils, silicone oils, and higher alcohols. <1> The skin cleansing product described. <3> The content of component (A) is preferably 25% by mass or more and 65% by mass or less in the total composition, more preferably 30% by mass or more and 65% by mass or less, even more preferably 35% by mass or more and 60% by mass or less, and even more preferably 40% by mass or more and 60% by mass or less. <1> or <2> A skin cleansing agent as described in any of the following. <4> Component (B) includes lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, arachidic acid, and behenic acid, and is one or more selected from lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, behenic acid, and their salts. <1> ~ <3> A skin cleansing agent as described in any of the following. <5> The content of component (B) is preferably 0.1% by mass or more and 2% by mass or less, more preferably 0.2% by mass or more and 1.8% by mass or less, even more preferably 0.3% by mass or more and 1.5% by mass or less, and even more preferably 0.5% by mass or more and 1.2% by mass or less. <1> ~ <4> A skin cleansing agent as described in any of the following. <6> The mass ratio (A / B) of component (A) to component (B) is preferably 12 or more and 250 or less, more preferably 13 or more and 200 or less, even more preferably 14 or more and 150 or less, and even more preferably 15 or more and 100 or less. <1> ~ <5> A skin cleansing agent as described in any of the following. <7> Component (C) is preferably one or more selected from alkylbenzene sulfonates, alkane sulfonates, alkenyl sulfonates, alkyl sulfonates, acyl isethionates, alkyl sulfates, alkyl ether sulfates, alkyl sulfosuccinates, sulfo fatty acid methyl esters, fatty acid alkanolamide sulfates, monoacylglycerin sulfates, alkyl phosphates, polyoxyethylene alkyl ether phosphates, alkylaryl ether phosphates, fatty acid amide ether phosphates, ether carboxylic acids or their salts, and N-acyl amino acid salts; more preferably, it contains at least one selected from alkyl sulfates, alkyl ether sulfates, ether carboxylic acids or their salts, N-acyl amino acid salts, and sulfonate-type anionic surfactants; and even more preferably, it contains at least one selected from ether carboxylic acids or their salts, N-acyl amino acid salts, and sulfonate-type anionic surfactants. <1> ~ <6> A skin cleansing agent as described in any of the following. <8> The content of component (C) is preferably 0.1% to 2% by mass in the total composition, more preferably 0.3% to 1.8% by mass, even more preferably 0.5% to 1.5% by mass, and even more preferably 0.7% to 1.2% by mass. <1> ~ <7> A skin cleansing agent as described in any of the following. <9> The mass ratio (A / C) of component (A) to component (C) is preferably 11 to 250, more preferably 12 to 200, even more preferably 13 to 100, and even more preferably 16 to 90. <1> ~ <8> A skin cleansing agent as described in any of the following. <10> Component (D) is selected from powdered cellulose and crystalline cellulose. <1> ~ <9> A skin cleansing agent as described in any of the following. <11> The particle size of the cellulose scrub is preferably 110 μm to 600 μm, more preferably 120 μm to 550 μm, and even more preferably 150 μm to 500 μm. <1> ~ <10> A skin cleansing agent as described in any of the following. <12> The content of component (D) is more preferably 3.5% by mass or more and 9% by mass or less in the total composition, more preferably 4% by mass or more and 8% by mass or less, even more preferably 4.5% by mass or more and 8% by mass or less, and even more preferably 5% by mass or more and 8% by mass or less. <1> ~ <11> A skin cleansing agent as described in any of the following. <13> The mass ratio (A / D) of component (A) to component (D) is preferably 2 or more and 23 or less, more preferably 3 or more and 23 or less, even more preferably 4 or more and 22 or less, and even more preferably 5 or more and 20 or less. <1> ~ <12> A skin cleansing agent as described in any of the following. <14> Furthermore, it contains an ingredient selected from water, solid oil, nonionic surfactant, polyhydric alcohol, and thickener. <1> ~ <13> A skin cleansing agent as described in any of the following. <15> It is a cream-type skin cleanser. <1> ~ <14> A skin cleansing agent as described in any of the following. <16> The viscosity at 20°C is preferably 18,000 mPa·s to 200,000 mPa·s, more preferably 19,000 mPa·s to 190,000 mPa·s, and even more preferably 20,000 mPa·s to 180,000 mPa·s. <1> ~ <15> A skin cleansing agent as described in any of the following. [Examples]

[0029] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples.

[0030] Examples 1-16 and Comparative Examples 1-7 Skin cleansing agents with the compositions shown in Tables 1 and 2 were manufactured, and their smoothness upon application, irritation upon application, massage effect when spread on the skin, skin moisture after rinsing, skin smoothness after rinsing, skin softness after rinsing, skin cleansing ability, stability, and viscosity were evaluated. The results are shown in Tables 1 and 2.

[0031] (Manufacturing method) Ingredients (A), (B), (C), solid oil, nonionic surfactant, polyhydric alcohol, thickener, and chelating agent were heated to 80°C and uniformly mixed in a homomixer (Primix TK Robomix RM, 7000 rpm). Ingredient (D) or other scrubbing agents and preservatives were added at 50°C and uniformly mixed in a homomixer (Primix TK Robomix RM, 3000 rpm) to produce a cream-type skin cleanser.

[0032] (Evaluation method) (1) Smoothness when applied Three cosmetic evaluation specialists applied 1g of the formulation to the back of their hand and rubbed it in with the palm of their other hand, then evaluated it on a 5-point scale based on the following criteria. The results are shown as the average score of the three judges. 5: It is very smooth. 4: Smooth 3: Slightly smooth 2: Slightly not smooth 1: Not smooth

[0033] (2) Irritation when applied Three cosmetic evaluation specialists applied 1g of the formulation to the back of their hand and rubbed it in with the palm of their other hand, then evaluated it on a 5-point scale based on the following criteria. The results are shown as the average score of the three judges. 5: No irritation to the skin 4: Less irritating to the skin 3: There is a slight irritation to the skin. 2: It causes a slight irritation to the skin. 1: It causes skin irritation.

[0034] (3) Massage effect when applied to the skin Three cosmetic evaluation specialists applied 1g of the formulation to the back of their hand and rubbed it in with the palm of their other hand, then evaluated it on a 5-point scale based on the following criteria. The results are shown as the average score of the three judges. 5: You can really feel the massage effect on your skin. 4: You can feel the massage effect on your skin. 3: You can feel a slight massage effect on your skin. 2: I don't feel much of a massage effect on my skin. 1: I don't feel any massage effect on my skin.

[0035] (4) Moisturizing feeling after rinsing Three cosmetic evaluation panelists applied 1g of the formulation to the back of their hand, rubbed it in with the palm of their other hand, and then rinsed it off with tap water. They then evaluated the product on a 5-point scale based on the following criteria. The results are shown as the average score of the three panelists. 5: My skin feels very moisturized. 4: Leaves skin feeling moisturized 3: Skin becomes slightly moisturized 2: My skin feels a little dry. 1: My skin doesn't feel moisturized.

[0036] (5) Smoothness of the skin after rinsing Three cosmetic evaluation panelists applied 1g of the formulation to the back of their hand, rubbed it in with the palm of their other hand, and then rinsed it off with tap water. They then evaluated the product on a 5-point scale based on the following criteria. The results are shown as the average score of the three panelists. 5: It is very smooth. 4: Smooth 3: Slightly smooth 2: Slightly not smooth 1: Not smooth

[0037] (6) Softness of the skin after rinsing Three cosmetic evaluation panelists applied 1g of the formulation to the back of their hand, rubbed it in with the palm of their other hand, and then rinsed it off with tap water. They then evaluated the product on a 5-point scale based on the following criteria. The results are shown as the average score of the three panelists. 5: Very soft skin 4: Soft skin 3: Slightly soft skin 2: Skin is not very soft 1: My skin is not soft.

[0038] (7) Skin cleanliness Three cosmetic evaluation panelists applied 1g of the formulation to the back of their hand, rubbed it in with the palm of their other hand, and then rinsed it off with tap water. They then evaluated the product on a 5-point scale based on the following criteria. The results are shown as the average score of the three panelists. 5: My skin became very clean. 4: My skin became clean. 3: My skin became a little cleaner. 2: Skin is not very clean 1: Skin is not clean

[0039] (8) Stability Each detergent composition was filled into a cream bottle (model number ED-40, manufactured by Asai Glass Co., Ltd.) at a temperature of 50°C for 1 month. The appearance of each detergent composition after storage was visually observed and evaluated according to the following criteria. ○: No change △: Slightly different ×: Separation

[0040] In this invention, viscosity was measured under the following conditions. A spindle viscometer (manufactured by Toki Sangyo Co., Ltd.) was used to measure viscosity under the following measurement conditions. Measurement fixtures: TC (for viscosity between 40,000 and 400,000 mPa·s), TB (for viscosity between 16,000 and 40,000 mPa·s), or TA (for viscosity between 8,000 and 16,000 mPa·s) Rotation speed: 5 rpm Measurement time: 60 seconds Measurement temperature: 20℃

[0041] [Table 1]

[0042] [Table 2]

[0043] *1: Medium Oil Company (Carnation 70) (Sonneborn, LLC) *2:SILKFLO 364 (Vantage Specialty Chemicals) *3: Coconard MT (Kao Corporation) *4: Vegetable-derived squalane (Kishimoto Special Cod Liver Oil Industry Co., Ltd.) *5: Clopure OL-LQ-(JP) (Croda Japan Co., Ltd.) *6: Amilight GCK-11 (Ajinomoto Co., Inc.) *7:VITACEL CS 250 G(J. Rettenmaier & Sohne GMBH+CO.KG) *8: BC Walnut Shell Granules 60 RSA60137 (Nagaoka Fragrance Co., Ltd.) *9: BIODIOS Scrub original (Shimizu Chemical Co., Ltd.) *10: Multi-wax W-445 S (Sonneborn, LLC) *11: Premium Deodorizing Beeswax (Miki) (Miki Chemical Industry Co., Ltd.) *12: CMH-KB (National Mimatsu Co., Ltd.) *13: Leodor TW-S320V (Kao Corporation) *14: Echo Gum (MP Gokyo Food & Chemical Co., Ltd.)

[0044] All of the skin cleansing materials of the present invention exhibited excellent effects in all aspects, including smoothness upon application, sensation upon application, massage effect when spread on the skin, moisturizing effect after rinsing, smoothness of the skin after rinsing, softness of the skin after rinsing, and cleansing properties, stability, and viscosity. In contrast, the skin cleansing agents of Comparative Examples 1-7 did not show sufficient efficacy in the first three evaluation items described above.

Claims

1. The following ingredients (A) to (D): (A) Liquid oil at 25°C, 20% by mass or more and 70% by mass or less. (B) Fatty acids having 10 to 22 carbon atoms or salts thereof, (C) Anionic surfactants (excluding fatty acids having 10 to 22 carbon atoms or their salts), and (D) Cellulose 3% by mass or more and 10% by mass or less, A skin cleansing product containing [a specific ingredient / component].

2. The skin cleansing composition according to claim 1, wherein the mass ratio (A / D) of component (A) to component (D) is 2 or more and 23 or less.

3. The skin cleansing composition according to claim 1 or 2, wherein component (A) is one or more selected from hydrocarbon oils, ester oils, ether oils, silicone oils, and higher alcohols.

4. A skin cleansing agent according to claim 1 or 2, wherein the content of component (B) is 0.1% by mass or more and 2% by mass or less.

5. The skin cleansing agent according to claim 1 or 2, wherein component (C) is at least one anionic surfactant selected from alkyl sulfate salts, alkyl ether sulfate salts, ether carboxylic acids or salts thereof, N-acyl amino acid salts, and sulfonate-type anionic surfactants.

6. A skin cleansing agent according to claim 1 or 2, wherein the content of component (C) is 0.1% by mass or more and 2% by mass or less.

7. The skin cleansing agent according to claim 1 or 2, wherein component (D) is at least one type of cellulose selected from powdered cellulose and crystalline cellulose.

8. A skin cleansing agent according to claim 1 or 2, which is a cream-type skin cleansing agent.

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