Skin cleanser composition

Abstract

The present invention relates to a skin cleansing composition containing the following components (A) and (B): Component (A): one or more selected from N-acylamino acids represented by formula (1) or salts thereof (A1), N-acyltaurines represented by formula (2) or salts thereof (A2), and fatty acids having 8 to 20 carbon atoms or salts thereof (A3). Component (B): one or more selected from TRIS, AMP, AMPD, and MEA JPEG2025536753000024.jpg48170 (in the formula, R 1 is a C5-24 linear or branched alkyl or alkenyl group, and R 2 is hydrogen or a C1-4 alkyl group, and R 3 , R 4 are each hydrogen, a C1-4 alkyl group, a C1-4 hydroxyalkyl group, or -(CH2) m1 -COOM 2 where m1 and n1 are numbers between 0 and 20, and M 1 , M 2 are each hydrogen, an alkali metal, an alkaline earth metal, a basic amino acid, ammonium, or an alkanolamine, R1 is a C8-20 linear or branched alkyl or alkenyl group, R2 is hydrogen or a C1-3 alkyl group, and M is hydrogen, an alkali metal, an alkaline earth metal, a basic amino acid, ammonium, or an alkanolamine.

Description

[Technical Field]

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

[0002] Dirt in pores is one of the main targets of skin cleansing. Dirt in pores mainly consists of oily dirt, makeup residue, and blackheads. Among these, blackheads are found in pores in areas where sebum is secreted in large amounts, such as around the nose, and are dirt that clogs pores like plugs, and are mainly composed of proteins and lipids. If such keratin plugs are left unremoved, the skin will become rough, and the keratin plugs will physically push the pores open, causing them to become larger, and the surface of the keratin plugs will also become dark due to oxidation, damaging the beauty of the skin. Furthermore, these can cause acne and other skin problems such as rashes and pimples. For these reasons, keratin plugs are one of the causes of noticeable pores and are a source of concern for many women. Therefore, various techniques are needed to remove dirt from pores, especially keratin plugs.

[0003] For example, Patent Document 1 discloses a method for removing keratin plugs that can fully exert excellent keratin plug removal effects without causing pain or irritation to the skin. This method removes keratin plugs using a composition containing one or more selected from 2-amino-2-hydroxymethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, and 2-amino-2-methyl-1,3-propanediol. Patent Document 1 also discloses that the composition further contains an anionic surfactant to improve foaming properties. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. WO2018 / 190301 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the composition of Patent Document 1, when a component having a keratin plug removing effect, such as 2-amino-2-hydroxymethyl-1,3-propanediol, is used in combination with a large amount of any ionic surfactant, there is a problem that it is not possible to achieve both foaming properties and keratin plug cleansing power. Furthermore, when the cleanser composition of Patent Document 1 is used in a foam-dispensing container, the component having a keratin plug removing effect, such as 2-amino-2-hydroxymethyl-1,3-propanediol, is prone to crystallization and precipitation, causing the nozzle of the foam-dispensing container to clog, resulting in the problem that foam cannot be stably discharged from the foam-dispensing container for a long period of time. [Means for solving the problem]

[0006] In view of the problems existing in the prior art, the present inventors have conducted extensive research and have found that by using a specific anionic surfactant in combination with a component having a keratin plug removing effect, it is possible to obtain a skin cleanser composition that combines excellent pore cleansing power, particularly keratin plug cleansing power, with excellent foaming properties, and have completed the present invention.

[0007] The present invention provides a skin cleanser composition comprising the following component (A) and component (B): Component (A): An anionic surfactant that is one or more of the following components (A1), (A2), and (A3): Component (A1): N-acylamino acid or a salt thereof represented by the following general formula (1):

[0008] [ka]

[0009] (In formula (1), R 1 represents a linear or branched alkyl or alkenyl group having 5 to 24 carbon atoms, and R 2 represents hydrogen or an alkyl group having 1 to 4 carbon atoms, and R 3 and R 4are the same or different and are hydrogen, an alkyl group having 1 to 4 carbon atoms, a hydroxyalkyl group having 1 to 4 carbon atoms, or -(CH2) m1 -COOM 2 where m1 and n1 are numbers from 0 to 20, and M 1 , M 2 are the same or different and represent hydrogen, an alkali metal, an alkaline earth metal, a basic amino acid, ammonium, or an alkanolamine. Component (A2): N-acyltaurine or its salt represented by the following general formula (2): [ka] (In formula (2), R1 represents a linear or branched alkyl or alkenyl group having 8 to 20 carbon atoms, R2 represents hydrogen or an alkyl group having 1 to 3 carbon atoms, and M represents hydrogen, an alkali metal, an alkaline earth metal, a basic amino acid, ammonium, or an alkanolamine.) Component (A3): fatty acid having 8 to 20 carbon atoms or its salt Component (B): One or more selected from 2-amino-2-hydroxymethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, and monoethanolamine

[0010] Furthermore, the inventors have discovered that by including a specific amount of polyol in the above skin cleanser composition, it is possible to achieve excellent pore cleansing power, excellent foaming properties and foam quality, while also suppressing crystallization of components that have the effect of removing keratin plugs, and preventing clogging of the foam-dispensing container.

[0011] The present invention also provides a foam-discharging container-packaged detergent composition comprising the above-mentioned component (A), component (B), and a polyol. [Effects of the Invention]

[0012] According to the present invention, a skin cleanser composition can be provided that has both excellent pore cleansing power, particularly keratin plug cleansing power, and excellent foaming properties.Furthermore, the present invention provides a skin cleanser composition in a foam-discharging container that has both excellent pore cleansing power, particularly keratin plug cleansing power, excellent foaming properties, and foam quality, and that can prevent clogging of the foam-discharging container. DETAILED DESCRIPTION OF THE INVENTION

[0013] In this specification, keratinous plug means a substance that physiologically forms in the pores of human skin and blocks the pores in a plug-like manner.The main components of such keratinous plugs are proteins derived from the stratum corneum and hair follicles, and keratinous plugs are formed from a mixture of these main components and proteins including proteins derived from Propionibacterium acnes and Staphylococcus aureus, proteins derived from intracellular organelles such as lysosomes, and lipids including triglycerides, free fatty acids, and lipid peroxides.

[0014] Each component contained in the skin cleanser composition of the present invention will be described in detail below.

[0015] <Component (A)> As component (A), one or more anionic surfactants selected from components (A1), (A2), and (A3) can be used. From the viewpoint of achieving excellent pore cleansing power, keratin plug cleansing power, and excellent foaming properties, the component (A) is preferably one or more anionic surfactants selected from component (A1) and component (A2), and more preferably one or more anionic surfactants selected from component (A1). Components (A1) to (A3) will be explained below.

[0016] (Component (A1)) The component (A1) used in the skin cleansing composition of the present invention is an N-acylamino acid represented by the following general formula (1) or a salt thereof.

[0017] [ka]

[0018] (In formula (1), R 1 represents a linear or branched alkyl or alkenyl group having 5 to 24 carbon atoms, and R 2 represents hydrogen or an alkyl group having 1 to 4 carbon atoms, and R 3 and R 4 are the same or different and are hydrogen, an alkyl group having 1 to 4 carbon atoms, a hydroxyalkyl group having 1 to 4 carbon atoms, or -(CH2) m1 -COOM 2 where m1 and n1 are numbers from 0 to 20, and M 1 , M 2 are the same or different and represent hydrogen, an alkali metal, an alkaline earth metal, a basic amino acid, ammonium, or an alkanolamine.

[0019] In the above formula (1), from the viewpoint of achieving both excellent pore cleansing power, particularly keratin plug cleansing power, and excellent foaming property, R 1 is preferably a straight or branched chain alkyl or alkenyl group having 8 to 20 carbon atoms, more preferably a straight or branched chain alkyl group having 8 to 20 carbon atoms, and even more preferably a straight or branched chain alkyl group having 8 to 18 carbon atoms. In addition, from the viewpoint of combining superior pore cleansing power, especially blackhead cleansing power, with excellent foaming properties, R 2 is preferably an alkyl group having 1 to 3 carbon atoms, more preferably a methyl group or an ethyl group, and even more preferably a methyl group. In addition, from the viewpoint of combining superior pore cleansing power, especially blackhead cleansing power, with excellent foaming properties, R 3 , R 4 are each preferably an alkyl group having 1 to 4 carbon atoms, a hydroxyalkyl group having 1 to 4 carbon atoms, or -(CH2) m1 -COOM 2 More preferably, an alkyl group having 1 to 4 carbon atoms, -(CH2) m1 -COOM 2 , more preferably -(CH2) m1 -COOM 2 is. Also, M 1 , M 2Examples of the cation include hydrogen; alkali metals such as sodium and potassium; alkaline earth metals such as calcium and magnesium; ammonium; alkanolamines such as monoethanolamine, diethanolamine, and triethanolamine; and cations derived from basic amino acids such as arginine and lysine. The acyl group of the N-acylamino acid or its salt used in the present invention may be derived from fatty acids such as caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, and behenic acid. Among these fatty acids, from the viewpoint of achieving a more excellent pore cleansing power, particularly a keratin plug cleansing power, and a more excellent foaming property, one or more selected from lauric acid, myristic acid, palmitic acid, and oleic acid are preferred, and lauric acid is more preferred. The acyl group of the N-acylamino acid or its salt may also be derived from a mixed fatty acid of the above-mentioned fatty acids, for example, a mixed fatty acid obtained from coconut oil, palm kernel oil, etc. as a raw material. Among these, the acyl group obtained from coconut oil fatty acid or palm kernel fatty acid as a raw material is preferred, and the acyl group obtained from coconut oil fatty acid as a raw material is more preferred.

[0020] Examples of N-acylamino acids or salts thereof used in the present invention include N-acylglycine or salts thereof, N-acylalanine or salts thereof, N-acylthreonine or salts thereof, N-acylserine or salts thereof, N-acylsarcosine or salts thereof, N-acylglutamic acid or salts thereof, and N-acylaspartic acid or salts thereof. Among these, from the viewpoint of combining even better pore cleansing power, particularly keratin plug cleansing power, with excellent foaming properties, N-acylamino acids or salts thereof having a branched chain structure are preferred, N-acylalanine or salts thereof, N-acylglutamic acid or salts thereof, N-acylthreonine or salts thereof, N-acylserine or salts thereof, and N-acylaspartic acid or salts thereof are more preferred, and N-acylglutamic acid or salts thereof and N-acylaspartic acid or salts thereof are even more preferred. As the salt of the N-acylamino acid or a salt thereof, from the viewpoint of reducing irritation to the skin or easy availability, one or more salts selected from alkali metal salts, triethanolamine salts, and arginine salts are preferred, one or more salts selected from sodium salts, potassium salts, arginine salts, and triethanolamine salts are more preferred, one or more salts selected from sodium salts and potassium salts are even more preferred, and sodium salts are particularly preferred. The above-mentioned N-acylamino acids or salts thereof can be used singly or in combination of two or more.

[0021] When the skin cleanser composition of the present invention contains component (A1), from the viewpoint of achieving both excellent pore cleansing power, particularly keratin plug cleansing power, and excellent foaming properties, the content of component (A1) in the skin cleanser composition, calculated as acid, is preferably 0.5% by mass or more, more preferably 0.8% by mass or more, and even more preferably 1% by mass or more. Furthermore, from the viewpoint of preventing an increase in the burden on the skin and achieving both excellent pore cleansing power, particularly keratin plug cleansing power, and excellent foaming properties, the content of component (A1) in the skin cleanser composition, calculated as acid, is preferably 15% by mass or less, more preferably 7.5% by mass or less, even more preferably 5% by mass or less, and particularly preferably 4% by mass or less.

[0022] (Component (A2) The component (A2) used in the skin cleansing composition of the present invention is an N-acyltaurine represented by the following general formula (2) or a salt thereof.

[0023] [ka]

[0024] (In formula (2), R1 represents a linear or branched alkyl or alkenyl group having 8 to 20 carbon atoms, R2 represents hydrogen or an alkyl group having 1 to 3 carbon atoms, and M represents hydrogen, an alkali metal, an alkaline earth metal, a basic amino acid, ammonium, or an alkanolamine.)

[0025] In the above formula (2), from the viewpoint of achieving both superior pore cleansing power, particularly keratin plug cleansing power, and superior foaming properties, R1 is preferably a linear or branched alkyl group or alkenyl group having 8 to 18 carbon atoms, and more preferably a linear or branched alkyl group having 10 to 18 carbon atoms. Furthermore, from the viewpoint of achieving both superior pore cleansing power, particularly keratin plug cleansing power, and superior foaming properties, R2 is preferably an alkyl group having 1 to 3 carbon atoms, more preferably a methyl group or an ethyl group, and even more preferably a methyl group. Examples of M include hydrogen; alkali metals such as sodium and potassium; alkaline earth metals such as calcium and magnesium; ammonium; alkanolamines such as monoethanolamine, diethanolamine, and triethanolamine; and cations derived from basic amino acids such as arginine and lysine, and among these, sodium and potassium are preferred.

[0026] Specific examples of such N-acyltaurines or salts thereof include, but are not limited to, N-lauroyl-N-methyltaurine or salts thereof, N-myristoyl-N-methyltaurine or salts thereof, N-cocoyl-N-methyltaurine or salts thereof, N-lauroyl-N-ethyltaurine or salts thereof, N-myristoyl-N-ethyltaurine or salts thereof, N-cocoyl-N-ethyltaurine or salts thereof, N-lauroyltaurine or salts thereof, and N-cocoyltaurine salts. The above-mentioned N-acyltaurines or salts thereof can be used alone or in combination of two or more.

[0027] When the skin cleanser composition of the present invention contains component (A2), from the viewpoint of achieving both excellent pore cleansing power, particularly keratin plug cleansing power, and excellent foaming properties, the content of component (A2) in the skin cleanser composition, calculated as acid, is preferably 0.1% by mass or more, more preferably 0.4% by mass or more, even more preferably 1.5% by mass or more, and more preferably 1.8% by mass or more. Furthermore, from the viewpoint of preventing an increase in the burden on the skin and achieving both excellent pore cleansing power, particularly keratin plug cleansing power, and excellent foaming properties, the content of component (A2) in the skin cleanser composition, calculated as acid, is preferably 25% by mass or less, more preferably 15% by mass or less, and even more preferably 6% by mass or less.

[0028] (Component (A3)) The component (A3) used in the skin cleansing composition of the present invention is a fatty acid having 8 to 20 carbon atoms or a salt thereof. From the viewpoint of achieving both superior pore cleansing power and keratin plug cleansing power and superior foaming properties, the fatty acid or salt thereof that can be used as component (A3) is preferably a fatty acid or salt thereof having a linear or branched alkyl group having 10 to 20 carbon atoms, more preferably a fatty acid or salt thereof having a linear or branched alkyl group having 10 to 18 carbon atoms, even more preferably a fatty acid or salt thereof having a linear alkyl group having 12 to 16 carbon atoms, and particularly preferably a fatty acid or salt thereof having a linear alkyl group having 12 to 14 carbon atoms. Specific examples include one or more acids selected from lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, and salts thereof. Among these, from the viewpoint similar to the above, it is preferable to contain one or more acids selected from lauric acid or a salt thereof, myristic acid or a salt thereof, and palmitic acid or a salt thereof, and more preferably one or two acids selected from lauric acid or a salt thereof, and myristic acid or a salt thereof. Examples of salts that constitute the fatty acid salt of component (A3) include alkali metals such as sodium and potassium; ammonium; and basic amino acids such as arginine and lysine, with sodium and potassium being preferred. The above fatty acids or salts thereof can be used alone or in combination of two or more.

[0029] When the skin cleanser composition of the present invention contains component (A3), from the viewpoint of achieving both excellent pore cleansing power and keratin plug cleansing power as well as excellent foaming properties, the content of component (A3) in the skin cleanser composition, calculated as acid, is preferably 1% by mass or more, more preferably 2% by mass or more. Furthermore, from the viewpoint of preventing an increase in the burden on the skin and exhibiting excellent pore cleansing power, the content of component (A3) in the skin cleanser composition, calculated as acid, is preferably 8% by mass or less, more preferably 6% by mass or less, and even more preferably 4% by mass or less.

[0030] <Ionic surfactants other than component (A)> From the viewpoint of improving the sebum cleansing ability and further improving the foaming ability, foam retention, and foam quality, the skin cleanser composition of the present invention may contain an ionic surfactant other than the above-mentioned component (A). Examples of the ionic surfactant other than the above-mentioned component (A) include anionic surfactants other than the component (A) and amphoteric surfactants, and preferably one or more selected from anionic surfactants other than the component (A) and amphoteric surfactants. Examples of anionic surfactants other than component (A) include anionic surfactants having a sulfonic acid group or a sulfate ester group, and phosphate ester-type anionic surfactants. Specifically, examples of anionic surfactants having a sulfonic acid group or a sulfate ester group include alkylbenzenesulfonic acid, alkanesulfonic acid, alkenylsulfonic acid, alkylsulfonic acid, acylhydroxyethylsulfonic acid, alkyl sulfate ester, alkyl ether sulfate ester, alkylsulfosuccinic acid, sulfo fatty acid methyl ester, fatty acid alkanolamide sulfate ester, and monoacylglycerol sulfate ester. Examples of phosphate ester-type anionic surfactants include alkyl phosphate ester salts, polyoxyethylene alkyl ether phosphate salts, alkylaryl ether phosphate salts, and fatty acid amide ether phosphate salts. Examples of the amphoteric surfactant include betaine surfactants, such as carbonyl betaine, amido betaine, amido sulfobetaine, and sulfobetaine.

[0031] Ionic surfactants other than the above-mentioned component (A) can further improve foaming properties, foam retention, and foam quality, but may have a negative effect on the cleansing power for pores, particularly the cleansing power for keratin plugs. Therefore, when the skin cleanser composition of the present invention contains an ionic surfactant other than component (A), the content of anionic surfactants other than component (A), or the total content of anionic surfactants other than component (A) and amphoteric surfactants, calculated as acid, is preferably less than 1.5% by mass, more preferably 1.4% by mass or less, even more preferably 1% by mass or less, and most preferably, the composition is substantially free of ionic surfactants other than component (A). The term "substantially free" means that the substance is not added intentionally, and may be contained within a range that does not impair the effects of the present invention. For example, the content in the composition is 0.5% by mass or less, preferably 0.1% by mass or less, more preferably 0.05% by mass or less, and even more preferably 0% by mass. From the viewpoint of obtaining good pore cleansing power and keratin plug cleansing power, as well as further improving foaming ability, foam retention, and foam quality, the content of the anionic surfactant other than component (A), or the total content of the anionic surfactant other than component (A) and the amphoteric surfactant, in terms of acid, is higher than 0. From the same viewpoint, the mass ratio of the acid-equivalent content of the anionic surfactant other than component (A), or the total acid-equivalent content of the anionic surfactant other than component (A) and the amphoteric surfactant, to the acid-equivalent content of component (A), expressed as the content of the anionic surfactant other than component (A) (in terms of acid) or the total acid-equivalent content of the anionic surfactant other than component (A) and the amphoteric surfactant (in terms of acid) / the content of component (A) (in terms of acid), is greater than 0 and less than 1, preferably 0.9 or less, more preferably 0.8 or less, and even more preferably 0.7 or less.

[0032] <Ingredient (B)> Component (B) is a component having a keratin plug removing effect, and is one or more selected from 2-amino-2-hydroxymethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol and monoethanolamine. 2-Amino-2-hydroxymethyl-1,3-propanediol is a component represented by the following structural formula (x1) and is also known as "tris(hydroxymethyl)aminomethane" or "TRIS".

[0033] [ka]

[0034] TRIS has a molecular weight of 121.14, a melting point of 169 to 173°C, a boiling point of 219 to 220°C (10 mmHg), and a pKa of 8.03 at 25°C, making it a weak base that is easily soluble in water. 2-Amino-2-methyl-1-propanol is a component represented by the following structural formula (x2) and is also simply called "AMP."

[0035] [ka]

[0036] AMP has a molecular weight of 89.14, a melting point of 30 to 31°C, a boiling point of 165.5°C (10 mmHg), and a pKa of 9.72 at 25°C, making it a component that is easily soluble in water. 2-Amino-2-methyl-1,3-propanediol is a component represented by the following structural formula (x3) and is also simply called "AMPD."

[0037] [ka]

[0038] AMPD has a molecular weight of 105.14, a melting point of 107 to 112°C, a boiling point of 151°C (10 mmHg), and a pKa of 8.76 at 25°C, making it a component that is easily soluble in water. Monoethanolamine is a component represented by the following structural formula (x4) and is also simply called "MEA."

[0039] [ka]

[0040] MEA has a molecular weight of 61.08, a melting point of 10 to 11°C, a boiling point of 170.9°C (760 mmHg), and is a component that is easily soluble in water. From the viewpoint of obtaining better pore cleansing power and keratin plug cleansing power, component (B) is preferably one or more selected from 2-amino-2-hydroxymethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, and 2-amino-2-methyl-1,3-propanediol, and 2-amino-2-hydroxymethyl-1,3-propanediol is more preferred.

[0041] From the viewpoint of obtaining good keratin plug detergency, the total content of component (B) in the skin cleanser composition is preferably 0.08% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.3% by mass or more, even more preferably 0.5% by mass or more, even more preferably 0.8% by mass or more, even more preferably 1% by mass or more, even more preferably 2% by mass or more, even more preferably 3% by mass or more, even more preferably 4% by mass or more, and even more preferably 5% by mass or more. Also, from the viewpoint of providing good keratin plug detergency and suppressing crystallization of the skin cleanser composition to prevent clogging of a foam-discharging container, the total content of component (B) in the skin cleanser composition is preferably 35% by mass or less, more preferably 30% by mass or less, even more preferably 25% by mass or less, even more preferably 20% by mass or less, even more preferably 15% by mass or less, even more preferably 12% by mass or less, even more preferably 11% by mass or less, and even more preferably 10% by mass or less.

[0042] When the skin cleanser composition of the present invention contains component (A1), from the viewpoint of achieving both excellent pore cleansing power, particularly keratin plug cleansing power, and excellent foaming property, the mass ratio (B) / (A1) of the content of component (B) to the content of component (A1) calculated as acid, is 0.5 or more, preferably 0.8 or more, more preferably 1.5 or more, even more preferably 1.7 or more, still more preferably 3 or more, particularly preferably 3.4 or more, and is 10 or less, preferably 7 or less, more preferably 5 or less, and even more preferably 4.5 or less. When the skin cleanser composition of the present invention contains component (A2), from the viewpoint of achieving both excellent foaming properties and excellent pore cleansing power, particularly keratin plug cleansing power, the mass ratio (B) / (A2) of the content of component (B) to the content of component (A2) calculated as acid, is 0.3 or more, preferably 0.4 or more, more preferably 1 or more, even more preferably 6 or more, and is preferably 43 or less, preferably 20 or less, more preferably 13 or less, even more preferably 3.5 or less, and particularly preferably 3.2 or less. When the skin cleanser composition of the present invention contains component (A3), from the viewpoint of achieving both excellent foaming properties and excellent pore cleansing power, particularly excellent keratin plug cleansing power, the mass ratio (B) / (A3) of the content of component (B) to the content of component (A3) converted to acid is preferably 1.5 or more and preferably 7 or less, more preferably 6 or less.

[0043] <Ingredient (C)> When the skin cleanser composition of the present invention is a cleanser composition contained in a foam-discharging container, from the viewpoints of suppressing crystallization of the skin cleanser composition, preventing clogging of the nozzle of the foam-discharging container, and further improving foam quality, it is preferable that the skin cleanser composition of the present invention further contains a polyol as component (C), and it is more preferable that it contains a polyol that is liquid at 25°C. The polyol of component (C) may be a dihydric to octahydric alcohol, preferably a dihydric to hexahydric alcohol. Examples of such polyols include ethylene glycol, diethylene glycol, polyethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, dipropylene glycol, polypropylene glycol, 1,3-butanediol, isoprene glycol, glycerol, diglycerol, triglycerol, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, polyoxyalkylene glyceryl ether, polyoxyalkylene diglyceryl ether, polyoxyalkylene methyl glucoside, polyoxyalkylene ethyl glucoside, erythritol, xylitol, and sorbitol. The polyoxyalkylene may be a homopolymer or copolymer. Examples of such copolymers include polyoxyethylene-polyoxypropylene-polyoxybutylene copolymers and polyoxyethylene-polyoxypropylene copolymers. In the skin cleansing composition of the present invention, the polyols can be used alone or in combination of two or more. From the viewpoint of further suppressing crystallization of the skin cleanser composition and preventing clogging of the nozzle of the foam-discharging container, component (C) is preferably one or more selected from 1,2-propylene glycol, 1,3-propylene glycol, dipropylene glycol, polypropylene glycol, 1,3-butanediol, glycerol, diethylene glycol monoethyl ether, polyoxyalkylene glyceryl ether, polyoxyalkylene diglyceryl ether, polyoxyalkylene methyl glucoside, and sorbitol, and more preferably 1,2-propylene glycol, 1, The surfactant is at least one selected from 3-propylene glycol, dipropylene glycol, polypropylene glycol, glycerol, diethylene glycol monoethyl ether, polyoxyalkylene glyceryl ether, and polyoxyalkylene diglyceryl ether, and from the viewpoints of combining excellent foam quality and excellent pore cleansing power, particularly keratin plug cleansing power, further suppressing crystallization of the skin cleanser composition, and preventing clogging of the nozzle of the foam-dispensing container, it is more preferably at least one selected from 1,2-propylene glycol, 1,3-propylene glycol, dipropylene glycol, and glycerol.

[0044] From the viewpoints of further suppressing crystallization of the skin cleanser composition, preventing clogging of the nozzle of the foam-discharging container, and further improving foam quality, the total content of component (C) in the skin cleanser composition is preferably 3% by mass or more, more preferably 4% by mass or more, even more preferably 7% by mass or more, even more preferably 12.5% ​​by mass or more, and preferably 60% by mass or less, more preferably 50% by mass or less. Moreover, from the viewpoints of achieving both even better foam quality and even better pore cleansing power, particularly even better keratin plug cleansing power, the total content is preferably 35% by mass or less, more preferably 30% by mass or less, even more preferably 25% by mass or less. From the viewpoints of further suppressing crystallization of the skin cleanser composition, preventing clogging of the nozzle of the foam-dispensing container, and further improving foam quality, the mass ratio (C) / (B) of the content of component (C) to the content of component (B) is preferably 0.7 or more, more preferably 1.3 or more, even more preferably 1.5 or more, and even more preferably 2.5 or more, and from the viewpoint of also achieving even better pore cleansing power, in particular keratin plug cleansing power, it is preferably 60 or less, more preferably 50 or less, and even more preferably 45 or less. Furthermore, from the viewpoints of further suppressing crystallization of the skin cleanser composition, preventing clogging of the nozzle of the foam-dispensing container, and further improving foam quality, the content of component (B) and the total content of component (C) is preferably 10% by mass or more, more preferably 13% by mass or more, even more preferably 16% by mass or more, even more preferably 18% by mass or more, and even more preferably 20% by mass or more.

[0045] <Ingredient (D)> From the viewpoint of further improving foaming properties, the skin cleanser composition of the present invention preferably further contains a nonionic surfactant as component (D). From the viewpoint of further improving foaming properties, component (D) preferably contains a nonionic surfactant (D1) having an HLB of at least 11. The HLB of component (D1) is at least 11, preferably at least 12, more preferably at least 13, and is preferably at most 20, more preferably at most 19, and even more preferably at most 18. The HLB of component (D1) is also at least 11, preferably 11 to 20, more preferably 12 to 19, and even more preferably 13 to 18. Here, the HLB (hydrophilic-lipophilic balance) of the nonionic surfactant<Hydrophilic-Lypophilic Balance> ) indicates the molecular weight of the hydrophilic group portion in the total molecular weight of the nonionic surfactant, and is calculated using the following Griffin formula. HLB = 20 × (molecular weight of the hydrophilic group in the surfactant molecule / molecular weight of the surfactant) Examples of the nonionic surfactant of component (D1) include polyglycerin fatty acid esters, polyethylene glycol fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyoxyethylene polyoxypropylene glycol, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbit fatty acid esters, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, polyoxyethylene hydrogenated castor oil fatty acid esters, polyoxyethylene alkyl ethers, polyoxyethylene alkyl ether fatty acid esters, sucrose fatty acid esters, alkyl polyglucosides, and (poly)alkyl glyceryl ethers. Among these, from the viewpoint of improving sebum cleansing properties, rinsing properties, and foaming properties, it is preferable to contain one or more types selected from polyglycerin fatty acid esters, polyethylene glycol fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene hydrogenated castor oil fatty acid esters, polyoxyethylene alkyl ethers, and alkyl polyglucosides, and it is more preferable to contain one or more types selected from polyethylene glycol fatty acid esters, polyoxyethylene alkyl ethers, polyoxyethylene sorbitan fatty acid esters, and alkyl polyglucosides.

[0046] From the viewpoint of achieving better makeup removal, it is preferable to contain, as component (D), a nonionic surfactant (D2) having an HLB of less than 11. The HLB of component (D2) is less than 11, preferably 10 or less, more preferably 9 or less, preferably 4 or more, more preferably 5 or more, and even more preferably 6 or more, and the HLB of component (C2) is less than 11, preferably 4 to 10, more preferably 5 to 10, and even more preferably 6 to 9. Examples of the nonionic surfactant of component (D2) include polyethylene glycol surfactants such as ethylene glycol fatty acid esters such as ethylene glycol monostearate, polyethylene glycol fatty acid esters such as polyethylene glycol (2) monostearate, polyethylene glycol alkyl ethers such as polyethylene glycol (5) decyl pentadecyl ether, and polyethylene glycol hydrogenated castor oils such as polyethylene glycol (5) hydrogenated castor oil monoisolaurate; propylene glycol surfactants such as propylene glycol fatty acid esters, polypropylene glycol fatty acid esters, propylene glycol alkyl ethers, polypropylene glycol alkyl ethers, and ethylene oxide derivatives of propylene glycol alkyl ethers; glycerin fatty acid esters such as glycerin monoisostearate; glycerin alkyl ethers such as glycerin monoisostearyl ether; sorbitan fatty acid esters such as sorbitan monostearate; and polyglycerin fatty acid esters such as polyglyceryl monoisostearate. Among these, it is preferable to contain one or more selected from polyoxyethylene alkyl ethers and polyglycerin fatty acid esters. Although the inclusion of a nonionic surfactant in the skin cleanser composition of the present invention can improve foaming properties, too much nonionic surfactant content can adversely affect pore cleansing power. Therefore, the total amount of component (D) is preferably 10% by mass or less, more preferably 8% by mass or less.

[0047] <Other ingredients> The skin cleanser composition of the present invention may contain, in addition to the above-mentioned components, components commonly used in skin cleanser compositions, such as oils such as hydrocarbon oils, ester oils, ether oils, and vegetable oils; moisturizers such as sodium lactate, urea, and sodium pyrrolidonecarboxylate; pH adjusters such as sodium hydroxide, potassium hydroxide, sodium carbonate, sodium citrate, hydrochloric acid, and malic acid; antioxidants; disinfectants; extracts; fragrances; and colorants, within the scope of the effects of the present invention. From the viewpoint of improving pore cleansing power, particularly keratin plug cleansing power, the pH value of the skin cleanser composition of the present invention at 25°C is preferably 8.5 or more, more preferably 8.8 or more, even more preferably 9.0 or more, even more preferably 9.2 or more, even more preferably 9.3 or more, even more preferably 9.5 or more, even more preferably 9.8 or more, and even more preferably 10.0 or more. Furthermore, from the viewpoint of suppressing excessive burden on the skin, the pH value of the skin cleanser composition of the present invention at 25°C is preferably 12.5 or less, more preferably 12.2 or less, even more preferably 12 or less, even more preferably 11.8 or less, even more preferably 11.5 or less, even more preferably 11.2 or less, even more preferably 11 or less, and even more preferably 10.5 or less.

[0048] The formulation of the skin cleanser composition of the present invention is not particularly limited, and is preferably in the form of a foam, liquid, paste, cream, etc., and from the viewpoints of convenience of use and improving penetration into keratin plugs in pores, a foam or liquid is more preferred. The skin cleanser composition of the present invention can be suitably used as a face wash, cleansing cosmetic, body wash, etc. When the skin cleanser composition of the present invention is placed in a foam-dispensing container and applied in the form of foam, the foam-dispensing container filled with the skin cleanser composition of the present invention is not particularly limited, and may be any foam-dispensing container commonly used in this field. From the viewpoint of obtaining good foam quality, the gas-liquid mixing ratio, in terms of the volume ratio of air to cleanser composition (air / cleaner composition), is 10 / 1 or more, preferably 12 / 1 or more, more preferably 13 / 1 or more, even more preferably 16 / 1 or more, even more preferably 17 / 1 or more, and even more preferably 20 / 1 or more. From the viewpoint of miniaturizing the foam-dispensing container, the gas-liquid mixing ratio is 38 / 1 or less, preferably 30 / 1 or less, more preferably 29 / 1 or less, and even more preferably 26 / 1 or less.

[0049] The skin cleanser composition of the present invention can be prepared, for example, by sequentially adding component (A), component (B), and optionally component (C), component (D), and other components to water, followed by mixing and stirring. Alternatively, if necessary, water can be preheated to 60 to 80°C, and then components (A), (B), and the like can be added sequentially to the water, followed by mixing and stirring, and then the resulting mixture can be cooled to 20 to 35°C.

[0050] The method for using the skin cleanser composition of the present invention includes applying the skin cleanser composition of the present invention to the skin of the body, preferably the skin of the face, neck, limbs, or trunk excluding the scalp, more preferably the pore area on such skin, more preferably the pore area on the skin from the forehead to the tip of the nose, and leaving it on for typically 10 seconds to 30 minutes, followed by rinsing with water or wiping with a wiper such as tissue, nonwoven fabric, or woven fabric, preferably rinsing with water. After applying the skin cleanser composition of the present invention, massage is not required, or the application site can be massaged for 10 seconds to 10 minutes, followed by rinsing with water or wiping with a wiper such as tissue, nonwoven fabric, or woven fabric, preferably rinsing with water. The skin cleanser composition of the present invention can also be applied to the pore area on the skin using a tool such as hands, nonwoven fabric, woven fabric, or a brush.

[0051] In the above embodiment, the present invention further discloses the following skin cleanser composition.

[0052] <1> Contains the following components (A) and (B): Component (A) is an anionic surfactant, which is one or more selected from the following components (A1), (A2), and (A3): Component (A1) is an N-acylamino acid or a salt thereof represented by the following general formula (1):

[0053] [ka]

[0054] (In formula (1), R 1represents a linear or branched alkyl or alkenyl group having 5 to 24 carbon atoms, and R 2 represents hydrogen or an alkyl group having 1 to 4 carbon atoms, and R 3 and R 4 are the same or different and are hydrogen, an alkyl group having 1 to 4 carbon atoms, a hydroxyalkyl group having 1 to 4 carbon atoms, or -(CH2) m1 -COOM 2 where m1 and n1 are numbers from 0 to 20, and M 1 , M 2 are the same or different and represent hydrogen, an alkali metal, an alkaline earth metal, a basic amino acid, ammonium, or an alkanolamine. Component (A2) is an N-acyltaurine represented by the following general formula (2) or a salt thereof:

[0055] [ka]

[0056] (In formula (2), R1 represents a linear or branched alkyl or alkenyl group having 8 to 20 carbon atoms, R2 represents hydrogen or an alkyl group having 1 to 3 carbon atoms, and M represents hydrogen, an alkali metal, an alkaline earth metal, a basic amino acid, ammonium, or an alkanolamine.) Component (A3) is a fatty acid having 8 to 20 carbon atoms or a salt thereof, A skin cleanser composition, wherein component (B) is one or more selected from 2-amino-2-hydroxymethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, and monoethanolamine.

[0057] <2> When the component (A) contains the component (A1), the content of the component (A1) is 0.5 to 15 mass% in terms of acid, and the mass ratio (B) / (A1) of the content of the component (B) to the content of the component (A1) in terms of acid is 0.5 to 10; when the component (A) contains the component (A2), the content of the component (A2) is 0.1 to 25 mass% in terms of acid, and the mass ratio (B) / (A2) of the content of the component (B) to the content of the component (A2) in terms of acid is 0.3 to 43; When the component (A) contains the component (A3), the content of the component (A3) is 1 to 8 mass% in terms of acid, and the mass ratio (B) / (A3) of the content of the component (B) to the content of the component (A3) in terms of acid is 1.5 to 7; The composition may contain an ionic surfactant other than component (A), and the content of the anionic surfactant other than component (A) or the total content of the anionic surfactant other than component (A) and the amphoteric surfactant is less than 1.5 mass% in terms of acid. <1> The skin cleanser composition according to claim 1. <3> In formula (1), R 3 , R 4 are each an alkyl group having 1 to 4 carbon atoms, a hydroxyalkyl group having 1 to 4 carbon atoms, or -(CH2) m1 -COOM 2 , preferably an alkyl group having 1 to 4 carbon atoms, -(CH2) m1 -COOM 2 , more preferably -(CH2) m1 -COOM 2 The above <1> or <2> The skin cleanser composition according to claim 1. <4> Component (A1) is one or more selected from N-acylglycine or a salt thereof, N-acylalanine or a salt thereof, N-acylthreonine or a salt thereof, N-acylserine or a salt thereof, N-acylsarcosine or a salt thereof, N-acylglutamic acid or a salt thereof, and N-acylaspartic acid or a salt thereof, preferably one or more selected from N-acylamino acids having a branched chain structure or salts thereof, more preferably one or more selected from N-acylalanine or a salt thereof, N-acylglutamic acid or a salt thereof, N-acylthreonine or a salt thereof, N-acylserine or a salt thereof, and N-acylaspartic acid or a salt thereof, and even more preferably one or more selected from N-acylglutamic acid or a salt thereof, and N-acylaspartic acid or a salt thereof, <1> ~ <3> The skin cleanser composition according to any one of the preceding claims. <5> When the skin cleanser composition contains component (A1), the content of component (A1), calculated as acid, is 0.5% by mass or more, preferably 0.8% by mass or more, more preferably 1% by mass or more, and 15% by mass or less, preferably 7.5% by mass or less, more preferably 5% by mass or less, and even more preferably 4% by mass or less. <1> ~ <4> The skin cleanser composition according to any one of the preceding claims. <6> When the skin cleanser composition contains component (A1), the mass ratio (B) / (A1) of the content of component (B) to the content of component (A1) calculated as acid is 0.5 or more, preferably 0.8 or more, more preferably 1.5 or more, even more preferably 1.7 or more, still more preferably 3 or more, particularly preferably 3.4 or more, and is 10 or less, preferably 7 or less, more preferably 5 or less, and even more preferably 4.5 or less. <1> ~ <5> The skin cleanser composition according to any one of the preceding claims. <7> The component (A2) is one or more selected from N-lauroyl-N-methyltaurine or a salt thereof, N-myristoyl-N-methyltaurine or a salt thereof, N-cocoyl-N-methyltaurine or a salt thereof, N-lauroyl-N-ethyltaurine or a salt thereof, N-myristoyl-N-ethyltaurine or a salt thereof, N-cocoyl-N-ethyltaurine or a salt thereof, N-lauroyltaurine or a salt thereof, and N-cocoyltaurine salts. <1> ~ <6> The skin cleanser composition according to any one of the preceding claims. <8> When the skin cleanser composition contains component (A2), the content of component (A2), calculated as acid, is 0.1% by mass or more, preferably 0.4% by mass or more, more preferably 1.5% by mass or more, even more preferably 1.8% by mass or more, and is 25% by mass or less, preferably 23% by mass or less, more preferably 15% by mass or less, even more preferably 6% by mass or less. <1> ~ <7> The skin cleanser composition according to any one of the preceding claims. <9> When the skin cleanser composition contains component (A2), the mass ratio (B) / (A2) of the content of component (B) to the content of component (A2) calculated as an acid, is 0.3 or more, preferably 0.4 or more, more preferably 1 or more, even more preferably 6 or more, and is preferably 43 or less, preferably 20 or less, more preferably 13 or less, even more preferably 3.5 or less, particularly preferably 3.2 or less. <1> ~ <8> The skin cleanser composition according to any one of the preceding claims. <10> The component (A3) is one or more selected from lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, and salts thereof. <1> ~ <9> The skin cleanser composition according to any one of the preceding claims. <11> When the skin cleanser composition contains component (A3), the content of component (A3), calculated as acid, is 1% by mass or more, preferably 2% by mass or more, and 8% by mass or less, preferably 6% by mass or less, more preferably 4% by mass or less. <1> ~ <10> The skin cleanser composition according to any one of the preceding claims. <12> When the skin cleanser composition contains component (A3), the mass ratio (B) / (A3) of the content of component (B) to the content of component (A3) converted to acid is 1.5 or more and 7 or less, preferably 6 or less. <1> ~ <11> The skin cleanser composition according to any one of the preceding claims. <13> The content of ionic surfactants other than component (A), or the total content of anionic surfactants other than component (A) and amphoteric surfactants, is preferably 1.4% by mass or less, more preferably 1% by mass or less, calculated as acid, and most preferably substantially free of ionic surfactants other than component (A). <1> ~ <12> The skin cleanser composition according to any one of the preceding claims. <14> The content of anionic surfactants other than component (A), or the total content of anionic surfactants other than component (A) and amphoteric surfactants, exceeds 0 mass% in terms of acid, The mass ratio of the content of anionic surfactants other than component (A) in terms of acid, or the total content of anionic surfactants other than component (A) and amphoteric surfactants in terms of acid, to the content of component (A) in terms of acid, expressed as the content of anionic surfactants other than component (A) (in terms of acid) or the total content of anionic surfactants other than component (A) and amphoteric surfactants (in terms of acid) / the content of component (A) (in terms of acid), is greater than 0 and less than 1, preferably 0.9 or less, more preferably 0.8 or less, and even more preferably 0.7 or less. <1> ~ <13> 1. The skin cleanser composition according to any one of the above. <15> The component (B) is one or more selected from the group consisting of 2-amino-2-hydroxymethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, and 2-amino-2-methyl-1,3-propanediol, and is preferably 2-amino-2-hydroxymethyl-1,3-propanediol. <1> ~ <14> The skin cleanser composition according to any one of the preceding claims. <16> In the skin cleanser composition, the total content of component (B) is 0.08% by mass or more, preferably 0.1% by mass or more, more preferably 0.3% by mass or more, even more preferably 0.5% by mass or more, even more preferably 0.8% by mass or more, even more preferably 1% by mass or more, even more preferably 2% by mass or more, even more preferably 3% by mass or more, even more preferably 4% by mass or more, even more preferably 5% by mass or more, and is 35% by mass or less, preferably 30% by mass or less, more preferably 25% by mass or less, even more preferably 20% by mass or less, even more preferably 15% by mass or less, even more preferably 12% by mass or less, even more preferably 11% by mass or less, and even more preferably 10% by mass or less. <1> ~ <15> The skin cleanser composition according to any one of the preceding claims. <17> When the skin cleanser composition is a skin cleanser composition in a foam-discharging container, the skin cleanser composition further contains a component (C) polyol. <1> ~ <16> The skin cleanser composition according to any one of the preceding claims. <18> Component (C) is a polyol that is liquid at 25°C, and is preferably one or more selected from 1,2-propylene glycol, 1,3-propylene glycol, dipropylene glycol, polypropylene glycol, 1,3-butanediol, glycerol, diethylene glycol monoethyl ether, polyoxyalkylene glyceryl ether, polyoxyalkylene diglyceryl ether, polyoxyalkylene methyl glucoside, and sorbitol, more preferably one or more selected from 1,2-propylene glycol, 1,3-propylene glycol, dipropylene glycol, polypropylene glycol, glycerol, diethylene glycol monoethyl ether, polyoxyalkylene glyceryl ether, and polyoxyalkylene diglyceryl ether, and even more preferably one or more selected from 1,2-propylene glycol, 1,3-propylene glycol, dipropylene glycol, and glycerol. <17> The skin cleanser composition according to claim 1. <19> The total content of component (C) is preferably 3% by mass or more, more preferably 4% by mass or more, even more preferably 7% by mass or more, even more preferably 12.5% ​​by mass or more, and is preferably 60% by mass or less, more preferably 50% by mass or less, even more preferably 35% by mass or less, even more preferably 30% by mass or less, even more preferably 25% by mass or less. <17> or <18> The skin cleanser composition according to claim 1. <20> The mass ratio (C) / (B) of the content of component (C) to the content of component (B) is preferably 0.7 or more, more preferably 1.3 or more, even more preferably 1.5 or more, even more preferably 2.5 or more, and is preferably 60 or less, more preferably 50 or less, even more preferably 45 or less. <17> ~ <19> The skin cleanser composition according to any one of the preceding claims. <21> The total content of component (B) and component (C) is 10% by mass or more, preferably 13% by mass or more, more preferably 16% by mass or more, even more preferably 18% by mass or more, and even more preferably 20% by mass or more. <17> ~ <20> The skin cleanser composition according to any one of the preceding claims. <22> The above composition further containing a nonionic surfactant as component (D). <1> ~ <21> The skin cleanser composition according to any one of the preceding claims. <23> The component (D) contains a nonionic surfactant having an HLB value of 11 or more as component (D1). <22> The skin cleanser composition according to claim 1. <24> The component (D1) comprises one or more selected from polyglycerin fatty acid esters, polyethylene glycol fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene hydrogenated castor oil fatty acid esters, polyoxyethylene alkyl ethers, and alkyl polyglucosides, and preferably comprises one or more selected from polyethylene glycol fatty acid esters, polyoxyethylene alkyl ethers, polyoxyethylene sorbitan fatty acid esters, and alkyl polyglucosides. <23> The skin cleanser composition according to claim 1. <25> The above, wherein the component (D) contains a nonionic surfactant having an HLB of less than 11 as the component (D2). <22> The skin cleanser composition according to claim 1. <26> The above, wherein the component (D2) comprises one or more selected from polyoxyethylene alkyl ethers and polyglycerin fatty acid esters. <25> The skin cleanser composition according to claim 1. <27> The total content of component (D) is 10% by mass or less, preferably 8% by mass or less. <22> ~ <26> The skin cleanser composition according to any one of the preceding claims. <28> The pH value of the skin cleanser composition at 25°C is 8.5 or higher, preferably 8.8 or higher, more preferably 9 or higher, even more preferably 9.2 or higher, even more preferably 9.3 or higher, even more preferably 9.5 or higher, even more preferably 9.8 or higher, even more preferably 10 or higher, and is 12.5 or lower, preferably 12.2 or lower, more preferably 12 or lower, even more preferably 11.8 or lower, even more preferably 11.5 or lower, even more preferably 11.2 or lower, even more preferably 11 or lower, even more preferably 10.5 or lower. <1> ~ <27> The skin cleanser composition according to any one of the preceding claims.

[0058] <29> The skin of the body, preferably the skin of the face, neck, limbs, trunk, etc., excluding the scalp, more preferably the pore area on these skins, and even more preferably the pore area on the skin from the forehead to the tip of the nose, <1> ~ <28> A method for removing keratin plugs, comprising applying the skin cleanser composition according to any one of the above items and, after a certain period of time, rinsing it off with water or wiping it off with a wiping material such as tissue, nonwoven fabric, or woven fabric. [Example]

[0059] The present invention will be described in more detail below with reference to examples. However, the following examples are merely illustrative of the present invention and are not intended to limit the present invention. Each of the cleaning compositions of the Examples and Comparative Examples was obtained using each component shown in the table below. Unless otherwise specified in the table, the content of each component is expressed in mass%.

[0060] Examples 1 to 32 and Comparative Example 1 Samples were prepared according to the formulations shown in Tables 1 to 4. Specifically, when component (A1) was used, the remaining components were added to water in order and mixed with stirring to obtain a sample. When component (A2) or component (A3) was used, water was heated to 70°C in advance, and the remaining components were added in order and mixed with stirring, and the resulting mixture was cooled to 20°C to obtain a sample. The pH of the obtained samples was measured at 25°C using a pH meter (Horiba, Ltd., Model F-22). Furthermore, the obtained samples were evaluated for pore cleansing power and foaming ability using the following methods. The results are shown in Tables 1 to 4.

[0061] <Evaluation of pore cleansing power> Using "Biore Nose Pack (manufactured by Kao Corporation)", keratin plugs were removed from the nose, and the resulting keratin plugs were carefully removed with tweezers. The resulting keratinocytes were placed on a glass slide (MATSUNAMI Glass Co., Ltd., 76 x 26 mm) and covered with a cover glass. 0.05 mL of the sample was then dropped onto the edge of the cover glass. This allowed the sample to penetrate into the gap between the slide and the cover glass by capillary action, bringing the keratinocytes into contact with the sample. The contact between the keratinocytes and the sample was recorded using a digital microscope (VHX-5000; Keyence Corporation, 150x magnification). After 1 minute of contact with the sample, the keratinocytes were washed with deionized water and evaluated for disintegration. The results of each evaluation are listed in the table as "pore cleansing power." Measurements were performed at 25°C. The pore cleansing power was evaluated on a six-level scale, with 1 being "almost no change in the appearance of the keratin plug" and 6 being "peeling and separation was observed from the surface layer of the keratin plug to its center (the appearance of the keratin plug was not maintained in its original shape)."

[0062] <Evaluation of foaming properties> Four expert panelists dropped 1 mL of the sample onto pre-wetted hands, rubbed their palms together for 10 seconds to create a lather, and evaluated the state of the lather according to the following criteria. The evaluation results are expressed as the average of the evaluations by the four expert panelists. (Judgment criteria) 5: Lots of foam 4: Slightly too much foam 3: There is some foam 2: Almost no bubbles 1: No foaming at all

[0063] The components used in the examples and comparative examples are shown below. <Component (A)> <Ingredient (A1)> (A1-1): Sodium cocoyl glutamate (trade name: AMISOFT CS-22B, manufacturer: Ajinomoto Co., Inc., contains 20% disodium cocoyl glutamate and 5% monosodium cocoyl glutamate) (A1-2): N-lauroyl-N-methyl-β-alanine sodium (trade name: ALANON ALE, manufacturer: Kawaken Seika Co., Ltd.) (A1-3): Potassium cocoyl glycinate (product name: AMILITE G12K, manufacturer: Ajinomoto Co., Inc., contains 30% potassium cocoyl glycinate) <Ingredient (A2)> (A2-1): N-lauroyl-N-methyltaurine sodium salt (trade name: NIKKOL LMT, manufacturer: NOF Corporation) <Ingredients (A3)> (A3-1): Lauric acid (trade name: LAURIC ACID, manufacturer: Malaysian Oxidation International) <Component (A')> [Ionic surfactants other than component (A)] (A'-1): Polyoxyethylene (5) lauryl ether carboxylic acid (product name: KAO AKYPO RLM-45, manufacturer: Kao Corporation) (containing 90% polyoxyethylene (5) lauryl ether carboxylic acid) (A'-2): Polyoxyethylene (2) alkyl (C10-16) ether sodium sulfate (trade name: Emal 227-PH11K, manufacturer: Kao Corporation) (A'-3): A mixture of sodium hexadecylhydroxysulfonate and sodium hexadecenylsulfonate (product name: PELEX DH-60, manufacturer: Kao Corporation)

[0064] <Ingredient (B)> (B-1): 2-amino-2-hydroxymethyl-1,3-propanediol (trade name: TRIS AMINO ULTRA PC(J) TROMETHAMINE, manufacturer: ANGUS Chemical Company) (B-2): 2-amino-2-methyl-1,3-propanediol (trade name: AMPD, manufacturer: Tokyo Chemical Industry Co., Ltd.) (B-3): 2-amino-2-methyl-1-propanol (trade name: AMP, manufacturer: Damas-beta) (B-4): Monoethanolamine (trade name: Monoethanolamine, manufacturer: Damas-beta) <Ingredient (C)> (C-1): 1,2-propylene glycol (product name: PROPYLENE GLYCOL (COSMETIC GRADE), manufacturer: ADEKA Corporation) (C-2): Polyoxypropylene diglyceryl ether (product name: SY-DP9, manufacturer: Sakamoto Pharmaceutical Co., Ltd.) (C-3): Diethylene glycol monoethyl ether (trade name: CARBITOL SOLVENT, manufacturer: Dow Chemical) (C-4): Dipropylene glycol (product name: DPG-RF, manufacturer: Adeka Corporation) (C-5): Polyoxyethylene (10) methyl glucoside (trade name: GLUCAM E-10, manufacturer: Lubrizol Corporation) (C-6) 1,3-Butanediol (trade name: 1,3-BUTYLENE GLYCOL-P, manufacturer: KH Neochem Co., Ltd.) (C-7): 1,3-propylene glycol (trade name: ZEMEA SELECT PROPANEDIOL, manufacturer: DuPont) (C-8): Glycerin (product name: GLYCERIN A (COSMETIC GRADE), manufacturer: Kao Corporation) (C-9): D-sorbitol (product name: SORBITOL #650, manufacturer: Mitsubishi Corporation Life Sciences Co., Ltd.) (C-10): Polypropylene glycol (7) (trade name: ADEKA CARPOL DL-30, manufacturer: Adeka Corporation, Mw = 400) (C-11): Polyoxyethylene (8) / Polyoxypropylene (5) / Polyoxybutylene copolymer glyceryl ether (trade name: WILBRIDE S-753, manufacturer: NOF Corporation) <Ingredient (D)> (D-1): Oligomeric D-glucopyranose C9-11 alkyl glycoside (product name: AG-10LK, manufacturer: Kao Corporation) (contains 40% oligomeric D-glucopyranose C9-11 alkyl glycoside)

[0065] [Table 1]

[0066] [Table 2]

[0067] [Table 3]

[0068] [Table 4]

[0069] As can be seen from Tables 1 to 4 above, the skin cleansing compositions obtained in the examples have both excellent pore cleansing power and excellent foaming properties. On the other hand, as can be seen from Comparative Example 1, when the specific anionic surfactant of the present invention is not used, it is not possible to achieve both pore cleansing power and foaming properties.

[0070] Examples 33 to 75 Samples were prepared according to the formulations shown in Tables 5 to 10. Specifically, when component (A1) was used, the remaining components were added sequentially to water, followed by mixing and stirring. When component (A2) and / or (A3) was used, the water was heated to 70°C in advance, the remaining components were added sequentially to water, followed by mixing and stirring, and the resulting mixture was cooled to 70°C. Each sample was then filled into a foam-dispensing container (manufacturer: Yoshino Kogyosho Co., Ltd., equipped with a pump-type device that is the gas-liquid mixing mechanism described in JP 2019-107644 A, with a gas-liquid mixing ratio of 20 / 1), to obtain skin cleanser compositions in foam-dispensing containers of Examples 33 to 75. Furthermore, the pH of the obtained compositions was measured using a pH meter (Horiba, Ltd., Model: F-22) at 25° C. As a result, it was found that the pH of the skin cleanser compositions in foam-discharging containers of Examples 33 to 75 was all in the range of 9.8 to 10.5. Furthermore, the pore cleansing power of the obtained samples was evaluated using the above method, and the foam quality of the foam discharged from the foam discharge container and the possibility of clogging the nozzle of the foam discharge container were evaluated using the following methods. The results obtained are shown in Tables 5 to 10.

[0071] <Foam quality discharged from the foam dispenser> The foam dispenser dispensed 4 ml of foam onto a wet hand, and the other hand was immediately pressed against the foam dispensed. The foam quality felt by the other hand was evaluated based on the following criteria. The evaluation results were expressed as the average of the evaluations by four expert evaluators. 5: Very good foam quality 4: Good foam quality 3: Fairly good foam quality 2: The foam quality is not very good 1: Poor foam quality

[0072] <Possibility of clogging of the nozzle of the foam dispenser> 5 g of sample was dropped into a 10 cm diameter petri dish and left uncovered in an environment of 30°C and 20% humidity for 24 hours. After 24 hours, the condition of the sample was evaluated according to the following criteria. 1. The entire sample is fluid (no crystals have precipitated), and when the bottom of the dish is tilted vertically to the ground, the entire sample flows. 2. Fluid and crystalline parts are mixed together. If you tilt the bottom of the dish perpendicular to the floor, the fluid part will flow. 3. Fluid and crystalline parts are mixed together. If the bottom of the dish is tilted perpendicular to the floor, the fluid part does not flow out, but if cigarette paper is pressed against the sample surface, the fluid liquid adheres to the cigarette paper. 4. There is no fluidity in the sample. When the bottom of the dish is tilted vertically to the floor, the fluidity does not flow out. When cigarette paper is pressed against the sample surface, the fluidity does not adhere to the cigarette paper.

[0073] [Table 5]

[0074] [Table 6]

[0075] [Table 7]

[0076] [Table 8]

[0077] [Table 9]

[0078] [Table 10]

[0079] As can be seen from Tables 5 to 10 above, the skin cleansing compositions obtained in the above examples have both pore cleansing power and foam quality, and can prevent clogging of foam-dispensing containers, so they can be used in foam-dispensing containers. As described above, the skin cleanser composition of the present invention can combine excellent pore cleansing power, particularly keratin plug cleansing power, with good foaming properties and foam quality, and can also inhibit crystal precipitation and prevent clogging of foam-dispensing containers.

Claims

1. A skin cleanser composition comprising the following components (A) and (B): Component (A): An anionic surfactant, which is one or more of the following components (A1), (A2), and (A3): Component (A1): N-acylamino acid or a salt thereof represented by the following general formula (1): 【Chemistry 1】 (In formula (1), R 1 represents a linear or branched alkyl or alkenyl group having 5 to 24 carbon atoms; R 2 represents hydrogen or an alkyl group having 1 to 4 carbon atoms, and R 3 and R 4 are the same or different and are hydrogen, an alkyl group having 1 to 4 carbon atoms, a hydroxyalkyl group having 1 to 4 carbon atoms, or -(CH 2 ) m1 -COOM 2 where m1 and n1 are numbers from 0 to 20, and M 1 , M 2 are the same or different and represent hydrogen, an alkali metal, an alkaline earth metal, a basic amino acid, ammonium, or an alkanolamine. Component (A2): N-acyltaurine or its salt represented by the following general formula (2): 【Chemistry 2】 (In formula (2), R 1 represents a linear or branched alkyl or alkenyl group having 8 to 20 carbon atoms; R 2 represents hydrogen or an alkyl group having 1 to 3 carbon atoms, and M represents hydrogen, an alkali metal, an alkaline earth metal, a basic amino acid, ammonium, or an alkanolamine. Component (A3): fatty acid having 8 to 20 carbon atoms or its salt Component (B): One or more selected from 2-amino-2-hydroxymethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, and monoethanolamine

2. When the component (A) contains the component (A1), the content of the component (A1) is 0.5 to 15 mass% in terms of acid, and the mass ratio (B) / (A1) of the content of the component (B) to the content of the component (A1) in terms of acid is 0.5 to 10; when the component (A) contains the component (A2), the content of the component (A2) is 0.1 to 25 mass% in terms of acid, and the mass ratio (B) / (A2) of the content of the component (B) to the content of the component (A2) in terms of acid is 0.3 to 43; when the component (A) contains the component (A3), the content of the component (A3) is 1 to 8 mass% in terms of acid, and the mass ratio (B) / (A3) of the content of the component (B) to the content of the component (A3) in terms of acid is 1.5 to 7; 2. The skin cleanser composition according to claim 1, which may contain an ionic surfactant other than component (A), wherein the content of the anionic surfactant other than component (A) or the total content of the anionic surfactant other than component (A) and the amphoteric surfactant is less than 1.5 mass% in terms of acid.

3. the content of anionic surfactants other than component (A), or the total content of anionic surfactants other than component (A) and amphoteric surfactants, exceeds 0 mass% in terms of acid; 3. The skin cleanser composition according to claim 1, wherein the mass ratio of the content of the anionic surfactant other than component (A) in terms of acid, or the total content of the anionic surfactant other than component (A) and the amphoteric surfactant in terms of acid, to the content of the component (A) in terms of acid, expressed as the content of the anionic surfactant other than component (A) (in terms of acid) or the total content of the anionic surfactant other than component (A) and the amphoteric surfactant (in terms of acid) / the content of the component (A) (in terms of acid), is greater than 0 and less than 1.

4. 4. The skin cleanser composition according to claim 1, wherein the mass ratio (B) / (A1) of the content of component (B) to the content of component (A1) calculated as acid is 0.8 to 7.

5. The skin cleanser composition according to any one of claims 1 to 4, wherein the mass ratio (B) / (A1) of the content of component (B) to the content of component (A1) calculated as acid is 1.5 to 5.

6. 6. The skin cleanser composition according to any one of claims 1 to 5, wherein the mass ratio (B) / (A2) of the content of component (B) to the content of component (A2) calculated as acid is 0.4 to 43.

7. 7. The skin cleanser composition according to claim 1, wherein the mass ratio (B) / (A2) of the content of component (B) to the content of component (A2) calculated as acid is 0.3 to 13.

8. The skin cleanser composition according to any one of claims 1 to 7, wherein the content of component (B) is 0.08 to 35% by mass.

9. A skin cleanser composition in a foam-discharging container, Further containing component (C) polyol, component (B) is one or more selected from 2-amino-2-hydroxymethyl-1,3-propanediol, 2-amino-2-methyl-1-propanol, and 2-amino-2-methyl-1,3-propanediol; The skin cleanser composition according to any one of claims 1 to 8, wherein the mass ratio (C) / (B) of the content of component (C) to the content of component (B) is 0.7 to 60.

10. The skin cleanser composition according to claim 9, wherein the content of component (C) is 3 to 60 mass%.

11. The skin cleanser composition according to claim 9 or 10, wherein the content of component (B) is 0.3 to 20% by mass.

12. The skin cleanser composition according to any one of claims 9 to 11, wherein the total content of component (B) and component (C) is 10% by mass or more.

13. The skin cleanser composition according to any one of claims 9 to 12, wherein component (C) is a polyol that is liquid at 25°C.

14. The skin cleanser composition according to any one of claims 9 to 13, wherein component (C) is at least one selected from 1,2-propylene glycol, 1,3-propylene glycol, dipropylene glycol, polypropylene glycol, 1,3-butanediol, glycerol, diethylene glycol monoethyl ether, polyoxyalkylene glyceryl ether, polyoxyalkylene diglyceryl ether, polyoxyalkylene methyl glucoside, and sorbitol.

15. The skin cleanser composition according to any one of claims 9 to 14, wherein the gas-liquid mixing ratio of the foam-discharging container is 10 / 1 to 38 / 1.

16. The skin cleanser composition according to any one of claims 1 to 15, wherein the pH of the skin cleanser composition at 25°C is 8.5 to 12.

5.

17. The skin cleanser composition according to any one of claims 1 to 16, wherein component (A1) is one or more selected from N-acylglycine or a salt thereof, N-acylalanine or a salt thereof, N-acylthreonine or a salt thereof, N-acylserine or a salt thereof, N-acylsarcosine or a salt thereof, N-acylglutamic acid or a salt thereof, and N-acylaspartic acid or a salt thereof.

18. The skin cleanser composition according to any one of claims 1 to 17, wherein the content of the nonionic surfactant is 10% by mass or less.

19. A method for removing keratin plugs, comprising applying the skin cleanser composition according to any one of claims 1 to 18 to the skin, leaving it to stand, and then rinsing it off with water or wiping it off with a wipe.

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