Liquid skin cleansing agent composition

Abstract

To provide a liquid skin cleanser composition which can improve the lack of tight feeling of the skin after towel-drying and its persistence and the texture of the skin after towel-drying and furthermore has excellent discharge properties from a foamer container and can discharge a foam having excellent quality.SOLUTION: There is provided a liquid skin cleanser composition filled in a foamer container which comprises (A) an anionic surfactant, (B) a cationic polymer containing 40 mol% or more of a structural unit derived from dimethyldiallylammonium chloride and (C) lanolin alcohol, wherein the mass ratio [{(A)+(B)} / (C)] of the total content of the component (A) and the component (B) to the content of the component (C) is 40 to 1050.SELECTED DRAWING: None

Description

[Technical Field]

[0001] This invention relates to a liquid skin cleansing composition. [Background technology]

[0002] Traditionally, liquid skin cleansing compositions such as hand soaps and body soaps have been desired to have good foam quality, including the texture of the foam, and to prevent skin from feeling tight after towel drying. One of the causes of skin tightness is dry skin.

[0003] To provide a moisturizing effect to the skin after washing, liquid skin cleansing compositions have been proposed that contain, for example, a fatty acid salt and a cationic polymer having a structural unit derived from dimethyldiallylammonium chloride (see, for example, Patent Document 1). However, these proposals were not satisfactory in terms of foam quality, the absence and persistence of tightness in the skin after towel drying, the texture of the skin after towel drying, and the dispensing from the foaming container.

[0004] Generally, it is known that adding more fatty acids such as lauric acid, myristic acid, palmitic acid, and stearic acid improves foam quality. However, increasing the proportion of fatty acids can lead to poor dispensing from the foaming container, reduced skin tightness after towel drying and its duration, and a decrease in skin texture after towel drying.

[0005] Therefore, there is a need for a liquid skin cleansing composition that can reduce and maintain the feeling of tightness in the skin after towel drying, improve the texture of the skin after towel drying, and further dispense foam of good quality from a foaming container. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2004-262838 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] The present invention aims to solve the aforementioned problems of the conventional approach and achieve the following objectives. Specifically, the present invention aims to provide a liquid skin cleansing composition that can reduce and maintain the feeling of tightness in the skin after towel drying, improve the texture of the skin after towel drying, and furthermore, has excellent dispensability from a foaming container and can dispense foam of good quality. [Means for solving the problem]

[0008] The inventors have conducted diligent studies to achieve the above objectives and have found that a liquid skin cleansing composition containing (A) an anionic surfactant, (B) a cationic polymer containing 40 mol% or more of structural units derived from dimethyldiallylammonium chloride, and (C) lanolin alcohol, wherein the mass ratio of the total content of components (A) and (B) to the content of component (C) [{(A)+(B)} / (C)] is 40 to 1,050, and which is filled into a foaming container, can improve the feeling of tightness in the skin after towel drying and the persistence of this feeling, as well as the texture of the skin after towel drying, and furthermore, it has excellent dispensability from the foaming container and can dispense foam of good quality, thus completing the present invention.

[0009] The present invention is based on the aforementioned findings by the inventors, and the means for solving the aforementioned problems are as follows: <1> (A) Anionic surfactants, (B) A cationic polymer containing 40 mol% or more of structural units derived from dimethyldiallylammonium chloride, (C) Lanolin alcohol and, It contains, The mass ratio of the total content of components (A) and (B) to the content of component (C) [{(A)+(B)} / (C)] is between 40 and 1,050. This is a liquid skin cleansing composition characterized by being filled into a foaming container. <2> The mass ratio of the content of component (A) to the content of component (B) [(A) / (B)] is 24 to 80. <1> This is a liquid skin cleansing composition as described above. <3> The content of component (A) is 12% to 20% by mass, the content of component (B) is 0.2% to 0.8% by mass, and the content of component (C) is 0.002% to 0.4% by mass, <1> from <2> This is a liquid skin cleansing composition as described in any of the above. <4> The viscosity at 25°C is 5 mPa·s to 30 mPa·s, <1> from <3> This is a liquid skin cleansing composition as described in any of the above. [Effects of the Invention]

[0010] According to the present invention, it is possible to solve the aforementioned problems in the conventional method and achieve the aforementioned objectives, providing a liquid skin cleansing composition that eliminates and maintains the feeling of tightness in the skin after towel drying, improves the texture of the skin after towel drying, and furthermore, has excellent dispensability from a foaming container and can dispense foam of good quality. [Modes for carrying out the invention]

[0011] (Liquid skin cleansing agent composition) The liquid skin cleansing composition of the present invention contains (A) an anionic surfactant, (B) a cationic polymer containing 40 mol% or more of structural units derived from dimethyldiallylammonium chloride, and (C) lanolin alcohol, and further contains other components as needed. The liquid skin cleansing composition of the present invention has a mass ratio [{(A)+(B)} / (C)] of the total content of component (A) and component (B) to the content of component (C) of 40 to 1,050, and is filled into a foaming container.

[0012] As a result, the liquid skin cleansing composition of the present invention can improve the tight feeling and its persistence of the skin after towel drying, and the texture of the skin after towel drying. Furthermore, it has excellent dischargeability from the former container and can discharge foam with good foam quality.

[0013] Generally, when the skin texture (grain, texture) is in a good state, substantially triangular mesh-like grooves can be seen on the surface of the skin. On the contrary, when the skin texture is in a bad state, the grooves become unclear, the shape of the mesh collapses, the grooves cannot be seen well, or the part without grooves becomes rough. Therefore, the skin texture is an important factor in skin beauty. The "grooves" are called skin grooves, and the flat part on the substantially triangle surrounded by these skin grooves is called a skin mound. Also, pores can be seen where the skin grooves intersect. When the skin texture is in a good state, the pores are small and not noticeable, while when the skin texture is in a bad state, the pores become large and noticeable. Thus, it is said that the skin texture is good when the width and depth of the skin grooves, the size and height of the skin mounds, and the size of the pores are uniformly aligned. It is widely known that the state of the skin texture reflects various influences such as the water content of the skin, metabolism, and dermal state in a complex manner.

[0014] The liquid skin cleansing composition can improve such skin texture. The skin texture can be confirmed, for example, by observing with a microscope. In this specification, if the maximum depth (μm) of the maximum wrinkle increases after use of the liquid skin cleansing composition compared to before use of the liquid skin cleansing composition, it can be determined that the skin texture has been improved by the liquid skin cleansing composition.

[0015] <(A) Anionic surfactant>(Liquid skin cleansing composition) <(A) Anionic surfactant> The anionic surfactant as the component (A) is mainly contained to improve the persistence of the lack of tight feeling after towel drying. [[ID=​​The anionic surfactant of the component (A) is not particularly limited and can be appropriately selected according to the purpose. For example, higher fatty acid salts, polyoxyethylene (POE) alkyl ether sulfates, ether carboxylates, amino acid-based surfactants, etc. can be mentioned. These may be used alone or in combination of two or more. Among these, higher fatty acid salts are preferred from the viewpoint of the persistence of the lack of stiffness after towel drying.

[0017] - Higher fatty acid salts - The higher fatty acid salt in the component (A) is not particularly limited and can be appropriately selected according to the purpose. For example, laurate, myristate, palmitate, stearate, etc. can be mentioned. These may be used alone or in combination of two or more.

[0018] The counter ion of the higher fatty acid salt is not particularly limited and can be appropriately selected according to the purpose. For example, alkali metal salts, amine salts, amino acid salts, etc. can be mentioned. The alkali metal salt is not particularly limited and can be appropriately selected according to the purpose. For example, sodium salt, potassium salt, etc. can be mentioned. The amine salt is not particularly limited and can be appropriately selected according to the purpose. For example, ammonium salt, monoethanolamine salt, diethanolamine salt, triethanolamine salt, alkanolamine salts such as 2-amino-2-methylpropanol, 2-amino-2-methylpropanediol, etc. can be mentioned. The amino acid salt is not particularly limited and can be appropriately selected according to the purpose. For example, lysine salt, arginine salt, etc. can be mentioned. Among these, alkali metal salts are preferred in terms of excellent foam retention, and potassium salts are particularly preferred.

[0019] The higher fatty acid salt may be a synthetic one used as appropriate or a commercially available product. Examples of commercially available higher fatty acid salts include, by trade name, NIKKOL Potassium Laurate LK-120 (potassium laurate, manufactured by Nikko Chemicals Co., Ltd.), NIKKOL Potassium Myristate MK-140 (potassium myristate, manufactured by Nikko Chemicals Co., Ltd.), Nonsal PK-1 (potassium palmitate, manufactured by NOF Corporation), Nonsal SK-1 (potassium stearate, manufactured by NOF Corporation), and Thai Soap MNK-40 (liquid containing potassium coconut oil fatty acid and potassium myristate, manufactured by Nikko Chemicals Co., Ltd.).

[0020] The aforementioned higher fatty acid salt can be formulated as a higher fatty acid salt, or it may be formed by adding the higher fatty acid and the aforementioned counterion salt, such as potassium hydroxide, separately to the blending tank and undergoing a neutralization reaction.

[0021] The higher fatty acid used in the preparation of the higher fatty acid salt may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available higher fatty acid salts include, by trade name, NAA(registered trademark)-122 (lauric acid, manufactured by NOF Corporation), NAA(registered trademark)-142 (myristic acid, manufactured by NOF Corporation), NAA(registered trademark)-160 (palmitic acid, manufactured by NOF Corporation), and NAA(registered trademark)-180 (stearic acid, manufactured by NOF Corporation).

[0022] There are no particular restrictions on the content of the aforementioned laurate salt, and it can be appropriately selected depending on the purpose, but it is preferably 4% to 10% by mass, and more preferably 6% to 9% by mass, based on the total amount of the liquid skin cleansing composition.

[0023] There are no particular restrictions on the content of the myristic acid salt, and it can be appropriately selected depending on the purpose, but it is preferably 3% to 12% by mass, and more preferably 4% to 8% by mass, based on the total amount of the liquid skin cleansing agent composition.

[0024] There are no particular restrictions on the content of the palmitate, and it can be appropriately selected depending on the purpose, but it is preferably 0.5% to 5% by mass, and more preferably 1.5% to 3.5% by mass, based on the total amount of the liquid skin cleansing composition.

[0025] There are no particular restrictions on the content of the stearate, and it can be appropriately selected depending on the purpose, but it is preferably 0.1% to 0.5% by mass, and more preferably 0.1% to 0.4% by mass, relative to the total amount of the liquid skin cleansing composition.

[0026] -Polyoxyethylene alkyl ether sulfate- The polyoxyethylene alkyl ether sulfate in component (A) is not particularly limited and can be appropriately selected depending on the purpose. For example, a compound represented by the following general formula (A1) can be used. The polyoxyethylene alkyl ether sulfate may be used alone or in combination of two or more types. [ka]

[0027] In the above general formula (A1), R 1 This represents an alkyl group. The number of carbon atoms in the alkyl group portion is preferably 10 to 14.

[0028] In the general formula (A1) above, n represents the average number of moles of ethylene oxide (EO) added. The average number of moles of ethylene oxide added is preferably 1 to 5.

[0029] In the general formula (A1) above, X represents an alkali metal or ammonium. The alkali metal is not particularly limited and can be appropriately selected depending on the purpose; for example, sodium and potassium are examples.

[0030] Specific examples of the aforementioned polyoxyethylene alkyl ether sulfates include polyoxyethylene(1) lauryl ether sodium sulfate, polyoxyethylene(2) lauryl ether sodium sulfate (also known as POE(2) laureth sulfate sodium), polyoxyethylene(3) lauryl ether sodium sulfate (also known as POE(3) laureth sulfate sodium), polyoxyethylene(4) lauryl ether sodium sulfate, polyoxyethylene(5) lauryl ether sodium sulfate, polyoxyethylene(3) alkyl(C12,13) ​​ether sodium sulfate, polyoxyethylene(2) lauryl ether ammonium sulfate, and polyoxyethylene(3) lauryl ether ammonium sulfate. The numbers in parentheses above represent the average number of moles (n) of ethylene oxide (EO) added.

[0031] The polyoxyethylene alkyl ether sulfate may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available polyoxyethylene alkyl ether sulfates include, by trade name, Texapon (registered trademark) N70 (manufactured by BASF, polyoxyethylene(2) lauryl ether sulfate sodium) and Synorin SPE-1250 (manufactured by Shin Nippon Rika Co., Ltd., polyoxyethylene(2) lauryl ether sulfate sodium).

[0032] -Ether carboxylate- The ether carboxylate in component (A) is not particularly limited and can be appropriately selected depending on the purpose. Examples include compounds represented by the following general formulas (A2) or (A3). The ether carboxylate may be used alone or in combination of two or more. [ka]

[0033] In the general formulas (A2) and (A3), R 2R represents a linear or branched alkyl or alkenyl group having 5 to 23 carbon atoms, or a phenyl group substituted with a linear or branched alkyl or alkenyl group having 5 to 23 carbon atoms. 2 The carbon number of the portion is preferably 10 to 14.

[0034] In the general formula (A2), R 3 These may be the same or different, and represent an alkylene group having 2 to 4 carbon atoms, with 2 carbon atoms being preferred.

[0035] In the general formula (A2) above, o represents the average number of moles of alkylene oxide added, ranging from 1 to 20. The average number of moles of alkylene oxide added is preferably 1 to 5.

[0036] In the general formulas (A2) and (A3), M 1 This represents a hydrogen atom, alkali metal, alkaline earth metal, ammonium, or basic amino acid.

[0037] Specific examples of ether carboxylate salts represented by the general formula (A2) or (A3) include polyoxyethylene (3) lauryl ether sodium acetate, polyoxyethylene (4) lauryl ether potassium acetate, and lauryl glycol sodium acetate. The numbers in parentheses above represent the average number of added moles (o) of alkylene oxide.

[0038] The aforementioned ether carboxylate may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available ether carboxylates include, by trade name, Energikol EC-30 (manufactured by Lion Specialty Chemicals Co., Ltd., sodium polyoxyethylene (3) lauryl ether acetate), Viewlight LCA-25F (sodium polyoxyethylene (3) lauryl ether acetate), Viewlight LCA-30D (sodium polyoxyethylene (3) lauryl ether acetate), Viewlight LCA-H (polyoxyethylene (4) lauryl ether acetate), Viewlight LCA-25NH (laureth-4 carboxylic acid), Viewlight SHAA (sodium lauryl glycol carboxylate), Viewlight LCA (sodium polyoxyethylene (3) lauryl ether acetate) (all manufactured by Sanyo Chemical Industries, Ltd.), Kao Akipo RLM-45NV (sodium polyoxyethylene (4.5) lauryl ether acetate), and Kao Akipo RLM-100NV (sodium polyoxyethylene (10) lauryl ether acetate) (all manufactured by Kao Corporation). The numbers in parentheses above represent the average number of added moles (o) of alkylene oxide.

[0039] - Amino acid-based surfactants - The amino acid-based surfactant in component (A) is not particularly limited and can be appropriately selected depending on the purpose. For example, a compound represented by the following general formula (A4) can be used. The amino acid-based surfactant may be used alone or in combination of two or more types. [ka]

[0040] In the above general formula (A4), R 4 R represents a linear or branched alkyl or alkenyl group having 5 to 23 carbon atoms, or a phenyl group substituted with a linear or branched alkyl or alkenyl group having 5 to 23 carbon atoms. 4 The carbon number of the portion is preferably 8 to 18.

[0041] In the above general formula (A4), R5 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.

[0042] In the general formula (A4), R 6 and R 7 may be the same or different, and represent a hydrogen atom or -(CH2) m -COOM 3 .

[0043] In the general formula (A4), m and n may be the same or different, and represent numbers from 0 to 20.

[0044] In the general formula (A4), M 2 and M 3 may be the same or different, and represent a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium, or a basic amino acid.

[0045] The amino acid structure of the hydrophilic part of the amino acid-based surfactant is not particularly limited and can be appropriately selected according to the purpose. However, glycine, glutamic acid, and methylalanine are preferred.

[0046] Specific examples of the amino acid-based surfactant represented by the general formula (A4) include N-acyl-glycine such as N-cocoyl-glycine potassium (N-coconut oil fatty acid acyl glycine potassium) and its salts; N-acyl-N-carboxyethyl-glycine such as N-myristoyl-N-carboxyethyl-glycine sodium and its salts; N-acylglutamic acid such as sodium N-myristoyl-L-glutamate, potassium N-myristoyl-L-glutamate, potassium N-coconut oil fatty acid acyl-L-glutamate, sodium N-palm fatty acid acyl-L-glutamate, sodium N-stearoyl-L-glutamate and its salts; potassium N-lauroyl-N-methyl-β-alanine, etc.

[0047] The amino acid-based surfactant may be one synthesized appropriately or a commercially available product. Examples of commercially available amino acid-based surfactants include, by trade name, Amilite (registered trademark) GCK-11 (N-coconut oil fatty acid acylglycine potassium), Amilite (registered trademark) GCK-12K (N-coconut oil fatty acid acylglycine potassium), Amilite (registered trademark) GCS-12K (N-coconut oil fatty acid acylglycine sodium), Amilite (registered trademark) GCS-11 (N-coconut oil fatty acid acylglycine sodium), Amisoft (registered trademark) CS-11 (N-myristoyl-L-glutamate sodium), Amisoft (registered trademark) CS-22 (N-coconut oil fatty acid acyl-L-glutamate sodium), and Amisoft (registered trademark) LS-11 (N-lauroyl-L-g Sodium glutamate), Amisoft® MS-11 (N-myristoyl-L-sodium glutamate), Amisoft® HS-11P (N-stearoyl-L-sodium glutamate), Amisoft® HS-11P(F) (N-stearoyl-L-sodium glutamate), Amisoft® HS21 (N-stearoyl-L-sodium glutamate), Amilight® ACS-12 (cocoyl alanine sodium) (all manufactured by Ajinomoto Healthy Supply Co., Ltd.), AminoSurfact® AMMS-P1 (N-myristoyl-L-sodium glutamate) (manufactured by Asahi Kasei Chemicals Corporation), NIKKOL Examples include Sarcosinate MN (sodium myristoylmethylaminoacetate), NIKKOL Alaninate LN-30 (sodium lauroylmethyl-β-alanine) (both manufactured by Nikko Chemicals Co., Ltd.), Alanone ACE (sodium coconut oil fatty acid methylalanine), Alanone AME (sodium myristoylmethyl-β-alanine), Alanone ALE (sodium lauroylmethyl-β-alanine) (all manufactured by Kawaken Fine Chemicals Co., Ltd.), Energicol L-30AN (sodium lauroylmethyl-β-alanine) (manufactured by Lion Specialty Chemicals Co., Ltd.), and Softilt AT-L (sodium lauroylmethyl-β-alanine) (manufactured by NOF Corporation).

[0048] There are no particular restrictions on the content of the anionic surfactant in component (A) above, and it can be appropriately selected depending on the purpose. However, from the viewpoint of the absence of tightness after towel drying and its persistence, as well as the dispensing from the foaming container and foam quality, it is preferably 10% to 25% by mass, and more preferably 12% to 20% by mass, based on the total amount of the liquid skin cleansing composition. When the content of component (A) is 10% by mass or more, the persistence of the absence of tightness after towel drying is good, and when it is 25% by mass or less, the absence of tightness after towel drying, the dispensing from the foaming container, and the foam quality are good.

[0049] <(B) Cationic polymers> The cationic polymer as component (B) is a cationic polymer containing 40 mol% or more of structural units derived from dimethyldiallylammonium chloride, and is included primarily to improve the texture of the skin after towel drying and to maintain the feeling of tightness after towel drying.

[0050] The cationic polymer is not particularly limited as long as it contains 40 mol% or more of structural units derived from dimethyldiallylammonium chloride, and can be appropriately selected depending on the purpose. Examples include dimethyldiallylammonium chloride polymers and dimethyldiallylammonium chloride-acrylic acid copolymers. These may be used individually or in combination of two or more.

[0051] The dimethyldiallylammonium chloride-acrylic acid copolymer in component (B) is a compound represented by the following general formula (B1). [ka] However, in the general formula (B1) above, n and m represent the molar ratio (mol%) of each structural unit, where n + m = 100 and m is 40 mol% or more. If m is less than 40 mol%, the persistence of the lack of tightness after towel drying, the dispensing from the foaming container, and the foam quality will be insufficient.

[0052] The molar ratio of structural units derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer of component (B) is 40 mol%, but from the viewpoint of the persistence of the lack of tightness after towel drying, the dischargeability from the foaming container, and the quality of the foam, it is preferable to have 65 mol% or more, and more preferably 96 mol% or more. The dimethyldiallylammonium chloride-acrylic acid copolymer may be used alone or two or more may be used in combination.

[0053] The molar ratio of each structural unit in the dimethyldiallylammonium chloride-acrylic acid copolymer in component (B) can be determined by measuring under the following measurement conditions using nuclear magnetic resonance (NMR). [Measurement conditions] Solvent: Deuterium water (D2O) Measuring instrument: JNM-LA300 (300MHz, manufactured by JEOL Ltd.)

[0054] The weight-average molecular weight of the cationic polymer of component (B) is not particularly limited and can be appropriately selected depending on the purpose, but 10,000 to 1,000,000 is preferred, and 15,000 to 450,000 is more preferred. The weight-average molecular weight of the cationic polymer of component (B) can be measured, for example, using the SEC-MALLS-RI system (measurement conditions: column: TSKgel α series α-M column 30 cm manufactured by Tosoh Corporation, solvent: 0.3 M aqueous solution of sodium nitrate).

[0055] The viscosity at 25°C of a solution containing 30% to 44% by mass of the cationic polymer of component (B) is preferably 10 mPa·s to 15,000 mPa·s, and more preferably 20 mPa·s to 12,000 mPa·s. The viscosity can be measured, for example, using a Brookfield viscometer LVF (manufactured by Brookfield).

[0056] The cationic polymer of component (B) may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available cationic polymers of component (B) include the following, by trade name.

[0057] MERQUAT 100 (Ingredient name: Dimethyldiallylammonium chloride polymer, manufactured by Lubrizol Nippon Co., Ltd., Viscosity at 25°C with solids content of 39% to 44% by mass: 8,000 mPa·s to 12,000 mPa·s, Weight-average molecular weight: 150,000). The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield Corporation) at 25°C, with a rotor of spindle No. 3, and under conditions of 6 revolutions per minute.

[0058] Marquardt 106 (Ingredient name: Dimethyldiallylammonium chloride polymer, manufactured by Lubrizol Nippon Co., Ltd., Viscosity at 25°C with solids content of 30% to 36% by mass: 20 mPa·s to 65 mPa·s, weight-average molecular weight 15,000). The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield Corporation) at 25°C, using rotor No. 1 spindle, and operating at 60 revolutions per minute.

[0059] Marquardt 280 (component name: dimethyldiallylammonium chloride-acrylic acid copolymer, manufactured by Lubrizol Nippon Co., Ltd., solid content 39% to 43% by mass, viscosity at 25°C: 3,000 mPa·s to 6,000 mPa·s, weight-average molecular weight 450,000, n:m = 35:65 (molar ratio) in the above general formula (1), molar ratio of structural units derived from dimethyldiallylammonium chloride is 65 mol). The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield Corporation) at 25°C, using a rotor with spindle No. 4, and operating at 60 revolutions per minute.

[0060] Marquardt 295 (component name: dimethyldiallylammonium chloride-acrylic acid copolymer, manufactured by Lubrizol Nippon Co., Ltd., viscosity at 25°C with solid content of 35% to 40% by mass: 3,500 mPa·s to 9,000 mPa·s, weight-average molecular weight 190,000, n:m = 5:95 (molar ratio) in the above general formula (1), molar ratio of structural units derived from dimethyldiallylammonium chloride is 95 mol). The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield Corporation) at 25°C, using a rotor with spindle No. 4, and at a rate of 30 revolutions per minute.

[0061] Among these, Marcoat 100 and Marcoat 295 are preferred as the cationic polymer of component (B) above, in terms of the persistence of the absence of tightness after towel drying, the ease of dispensing from the foaming container, and the quality of the foam.

[0062] There are no particular restrictions on the content of the cationic polymer in component (B) above, and it can be appropriately selected depending on the purpose. However, from the viewpoint of skin texture after towel drying, the persistence of the absence of tightness after towel drying, the ability to dispense from a foaming container, and the quality of the foam, it is preferable that the content be 0.1% to 1% by mass, and more preferably 0.2% to 0.8% by mass, relative to the total amount of the liquid skin cleansing composition. When the content of component (B) is 0.1% by mass or more, the skin texture after towel drying and the persistence of the absence of tightness after towel drying are good, and when it is 1% by mass or less, the ability to dispense from a foaming container and the quality of the foam are good.

[0063] (C) Lanolin Alcohol Lanolin alcohol, as component (C) mentioned above, is included primarily to improve the feeling of tightness after towel-drying.

[0064] The aforementioned lanolin alcohol is obtained by hydrolysis of lanolin and is a mixture containing cholesterol, which is an aliphatic alcohol, and contains 30% by mass or more of cholesterol.

[0065] There are no particular restrictions on the method for hydrolyzing lanolin to obtain the aforementioned lanolin alcohol, and a suitable method can be selected from among known methods.

[0066] There are no particular restrictions on the degree of purification of the lanolin alcohol, and various types of lanolin with different degrees of purification can be used.

[0067] The aforementioned lanolin alcohol may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available lanolin alcohol products include, by trade name, Ecolano AL E (manufactured by Nippon Seika Co., Ltd.), Lanolin Alcohol A (manufactured by Nippon Seika Co., Ltd.), and Super Heartrun (manufactured by Croda Japan Co., Ltd.).

[0068] There are no particular restrictions on the content of lanolin alcohol in component (C) above, and it can be appropriately selected depending on the purpose. However, from the viewpoint of not feeling tight after towel drying, dispensing from a foaming container, and foam quality, it is preferable that the content is 0.01% to 0.5% by mass, and more preferably 0.02% to 0.4% by mass, relative to the total amount of the liquid skin cleansing composition. When the content of component (C) is 0.01% by mass or more, there is good relief from feeling tight after towel drying, and when it is 0.5% by mass or less, the dispensing from a foaming container and foam quality are good.

[0069] <<Mass ratio [{(A)+(B)} / (C)]>> The mass ratio [{(A)+(B)} / (C)] of the total content (mass%) of components (A) and (B) to the content (mass%) of component (C) is preferably 40 to 1,050 from the viewpoint of the persistence of the absence of tightness after towel drying, and preferably 60 to 700 from the viewpoint of the skin texture after towel drying, the absence of tightness after towel drying, and its persistence. If the mass ratio [{(A)+(B)} / (C)] is less than 40, the persistence of the absence of tightness after towel drying is insufficient, and if it exceeds 1,050, the skin texture after towel drying, the absence of tightness after towel drying, and its persistence are insufficient.

[0070] <<Mass ratio [(A) / (B)]>> There are no particular restrictions on the mass ratio [(A) / (B)] of the content (mass%) of component (A) to the content (mass%) of component (B), and it can be appropriately selected depending on the purpose. However, from the viewpoint of the texture of the skin after towel drying and the persistence of the absence of tightness after towel drying, 24 to 80 is preferred, and 30 to 60 is more preferred. When the mass ratio [(A) / (B)] is 24 or more, the persistence of the absence of tightness after towel drying is good, and when it is 80 or less, the texture of the skin after towel drying, the absence of tightness after towel drying, and their persistence are good.

[0071] <Other ingredients> In addition to the components (A), (B), and (C) described above, the liquid skin cleansing composition may also contain other components commonly used in liquid skin cleansing compositions, as necessary, to the extent that it does not impair the present invention.

[0072] The aforementioned other components are not particularly limited and can be appropriately selected depending on the purpose. Examples include surfactants other than component (A), water-soluble polymers other than component (B), alcohols other than component (C), lanolin derivatives other than component (C), oils, silicones, protein derivatives, humectants, bactericides, preservatives, antioxidants, chelating agents, pH adjusters, metal sequestering agents, UV absorbers or scatterers, vitamins and other drugs, animal and plant extracts or derivatives thereof, thickeners, amino acids, dyes, fragrances, pigments, inorganic powders, clay minerals, water-insoluble polymer compound powders, and the like. These may be used individually or in combination of two or more. The other components mentioned above may be synthesized as appropriate, or commercially available products may be used.

[0073] -(A) Surfactants other than component- Other surfactants besides component (A) are not particularly limited and can be appropriately selected depending on the purpose. Examples include nonionic surfactants, cationic surfactants, and amphoteric surfactants. These may be used individually or in combination of two or more.

[0074] The nonionic surfactant is not particularly limited and examples include sorbitan fatty acid esters, glycerin fatty acid esters, alkylene oxide adducts of sorbitan fatty acid esters, alkylene oxide adducts of glycerin fatty acid esters, polyoxyalkylene alkyl ethers, polyoxyalkylene fatty acid esters, polyoxyalkylene alkylphenols, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene alkylphenyl formaldehyde condensates, polyoxyethylene sterols and their derivatives, polyoxyethylene lanolin and its derivatives, polyoxyethylene beeswax derivatives, sugar esters, polyoxyethylene hydrogenated castor oil, and polyoxyethylene castor oil.

[0075] The cationic surfactant is not particularly limited and includes alkyltrimethylammonium salts such as stearyltrimethylammonium chloride and lauryltrimethylammonium chloride, alkylpyridinium salts such as cetylpyridinium chloride, distearyldimethylammonium chloride dialkyldimethylammonium salt, poly(N,N'-dimethyl-3,5-methylenepiperidinium) chloride, alkylquaternary ammonium salt, alkyldimethylbenzylammonium salt, alkylisoquinolinium salt, dialkylmolyphonium salt, POE-alkylamine, alkylamine salt, polyamine fatty acid derivatives, amyl alcohol fatty acid derivatives, benzalkonium chloride, and benzethonium chloride.

[0076] There are no particular restrictions on the two surfactants mentioned above, and they can be appropriately selected depending on the purpose. Examples include betaine-type amphoteric surfactants and amino acid-type amphoteric surfactants.

[0077] There are no particular limitations on the betaine-type amphoteric surfactant, and it can be appropriately selected depending on the purpose. Examples include alkylbetaine-type amphoteric surfactants such as lauryldimethylaminoacetic acid betaine, coconut oil alkyl betaine, and stearyldimethylaminoacetic acid betaine; amidebetaine-type amphoteric surfactants such as lauric acid amidopropyl betaine, coconut oil fatty acid amidopropyl betaine, and palm kernel oil fatty acid amidopropyl betaine; sulfobetaine-type amphoteric surfactants such as lauryl hydroxysulfobetaine, lauramidopropyl hydroxysultaine, coconut oil fatty acid dimethylamino hydroxysulfobetaine, and lauryldimethylamino hydroxysulfobetaine; and imidazolinium betaine-type amphoteric surfactants such as N-lauroyl-N'-carboxymethyl-N'-hydroxyethylethylenediamine sodium, N-coconut oil fatty acid acyl-N'-carboxymethyl-N'-hydroxyethylethylenediamine sodium, and 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine.

[0078] The aforementioned amino acid-type amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include sodium β-laurylaminopropionate, sodium laurylaminodipropionate, sodium N-lauroyl-N'-carboxymethyl-N'-hydroxyethylethylenediamine, sodium coconut oil alkylaminopropionate, N-lauryl β-alanine, and N-stearyl β-alanine.

[0079] The content of surfactants other than component (A) is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose.

[0080] -(B) Water-soluble polymers other than component - Other than component (B), there are no particular restrictions on the water-soluble polymers, and they can be appropriately selected depending on the purpose. Examples include hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, polyethylene glycol, highly polymerized polyethylene glycol, polyvinyl alcohol, polyglutamic acid, carboxyvinyl polymer, acrylic acid / alkyl methacrylate copolymer, alkyl acrylate copolymer, O-[2-hydroxy-3-(trimethylammonio)propyl]hydroxyethylcellulose chloride, and O-[2-hydroxy-3-(trimethylammonio)propyl]guar gum chloride. These may be used individually or in combination of two or more.

[0081] The content of water-soluble polymers other than component (B) is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose.

[0082] -(C) Alcohols other than component- There are no particular restrictions on the alcohols other than component (C) mentioned above, and they can be appropriately selected depending on the purpose. They may be lower alcohols or higher alcohols. Specific examples of alcohols other than component (C) mentioned above include natural and synthetic higher alcohols such as cetyl alcohol, oleyl alcohol, stearyl alcohol, hexyldecanol, octyldodecanol, and lauryl alcohol. These may be used individually or in combination of two or more.

[0083] The content of alcohols other than component (C) is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose, but it is preferably 0.1% to 3% by mass relative to the total amount of the liquid skin cleansing composition.

[0084] -Lanolin derivatives other than component (C)- Other than component (C) mentioned above, there are no particular restrictions on the lanolin derivatives, and they can be appropriately selected depending on the purpose. Examples include lanolin alcohol fatty acid esters, lanolin alcohol polyethylene glycol ethers, and lanolin alcohol polypropylene glycol ethers. These may be used individually or in combination of two or more.

[0085] The content of lanolin derivatives other than component (C) is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose.

[0086] -Oil- The oils mentioned above are not particularly limited and can be appropriately selected depending on the purpose. Examples include vegetable oils and fats such as castor oil, olive oil, cocoa oil, hydrogenated palm oil, camellia oil, coconut oil, wood wax, jojoba oil, grapeseed oil, and avocado oil, and their ester compounds; animal oils and fats such as mink oil and egg yolk oil; waxes such as beeswax, whale wax, lanolin, hydrogenated lanolin, carnauba wax, and candelilla wax; hydrocarbons such as liquid paraffin, squalane, microcrystalline wax, ceresin wax, paraffin wax, and petrolatum; and esters such as glycerol tri-2-ethylhexanoate, 2-ethylhexyl stearate, butyl stearate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, octyldodecyl oleate, and cholesterol oleate. These may be used individually or in combination of two or more.

[0087] The oil content is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose, but is preferably 0.1% to 3% by mass relative to the total amount of the liquid skin cleansing composition.

[0088] -Moisturizer- There are no particular restrictions on the humectant, and it can be appropriately selected depending on the purpose. Examples include isoprene glycol, 1,2-pentanediol, diethylene glycol, diethylene glycol monoalkyl ether, propylene glycol, polypropylene glycol, polypropylene glycol, hydrogenated castor oil (30 E.O.), diglycerin, triglycerin, and polyglycerin. These may be used individually or in combination of two or more.

[0089] The amount of the humectant is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose, but is preferably 0.1% to 10% by mass relative to the total amount of the liquid skin cleansing composition.

[0090] - Preservatives - There are no particular restrictions on the preservatives mentioned above, and they can be appropriately selected depending on the purpose. Examples include benzoates, sorbates, dehydroacetates, parahydroxybenzoates, 2,4,4'-trichloro-2'-hydroxydiphenyl ether, 3,4,4'-trichlorocarbanilide, benzalkonium chloride, hinokitiol, resorcinol, methylchloroisothiazolinone / methylisothiazolinone solution (product name: Kayson CG, manufactured by Rohm & Haas Japan), salicylic acid, pentanediol, phenoxyethanol, and ethanol. These may be used individually or in combination of two or more.

[0091] The amount of the preservative is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose, but it is preferably 0.1% to 1% by mass relative to the total amount of the liquid skin cleansing composition.

[0092] -Antioxidant- The aforementioned antioxidant is not particularly limited and can be appropriately selected depending on the purpose. Examples include dibutylhydroxytoluene, butylhydroxyanisole, and ascorbic acid. These may be used individually or in combination of two or more.

[0093] The content of the antioxidant is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose, but it is preferably 0.1% to 1% by mass relative to the total amount of the liquid skin cleansing composition.

[0094] -Chelating agent- There are no particular restrictions on the chelating agent, and it can be appropriately selected depending on the purpose. Examples include disodium edetate, ethylenediaminetetraacetate, hexametaphosphate, and gluconic acid. These may be used individually or in combination of two or more.

[0095] The content of the chelating agent is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose, but it is preferably 0.1% to 1% by mass relative to the total amount of the liquid skin cleansing composition.

[0096] - pH adjuster - There are no particular restrictions on the pH adjusting agent, and it can be appropriately selected depending on the purpose. Examples include sodium hydroxide, potassium hydroxide, citric acid, hydrochloric acid, succinic acid, triethanolamine, aqueous ammonia, triisopropanolamine, phosphoric acid, and glycolic acid. These may be used individually or in combination of two or more.

[0097] The content of the pH adjusting agent is not particularly limited as long as it can adjust the liquid skin cleansing composition to the desired pH, and can be appropriately selected depending on the purpose.

[0098] -UV absorber or scattering agent- The aforementioned ultraviolet absorber or scattering agent is not particularly limited and can be appropriately selected depending on the purpose. Examples include 2-hydroxy-4-methoxybenzophenone, octyldimethyl para-aminobenzoate, ethylhexyl para-methoxycinnamate, titanium dioxide, kaolin, and talc. These may be used individually or in combination of two or more.

[0099] The content of the ultraviolet absorber or scattering agent is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose.

[0100] -Vitamins- There are no particular restrictions on the vitamins mentioned above, and they can be appropriately selected depending on the purpose. Examples include vitamin A, B vitamins, vitamin C, vitamin D, vitamin E, vitamin F, vitamin K, vitamin P, vitamin U, carnitine, ferulic acid, gamma-oryzanol, alpha-lipoic acid, orotic acid, or their derivatives. These may be used individually or in combination of two or more.

[0101] The amount of vitamins mentioned above is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose, but it is preferably 0.001% to 0.5% by mass relative to the total amount of the liquid skin cleansing composition.

[0102] - Amino acids - The aforementioned amino acids are not particularly limited and can be appropriately selected depending on the purpose. Examples include glycine, alanine, valine, leucine, isoleucine, phenylalanine, tryptophan, cystine, cysteine, methionine, proline, hydroxyproline, aspartic acid, glutamic acid, arginine, histidine, lysine, and their derivatives. These may be used individually or in combination of two or more.

[0103] The content of the amino acids is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose, but it is preferably 0.001% to 0.5% by mass relative to the total amount of the liquid skin cleansing composition.

[0104] -Water-insoluble polymer compound powder- The water-insoluble polymer compound powder is not particularly limited and can be appropriately selected depending on the purpose. Examples include nylon and polyethylene. These may be used individually or in combination of two or more types.

[0105] The content of the water-insoluble polymer compound powder is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose.

[0106] < <ph>> The pH of the liquid skin cleansing composition at 25°C is not particularly limited and can be appropriately selected depending on the purpose, but 9.5 to 11.0 is preferred, and 9.8 to 10.6 is more preferred. The aforementioned pH can be measured, for example, using a glass electrode color hydrogen ion concentration indicator HM-30R (electrode type GST-5721, manufactured by TOA DKK).

[0107] <<Viscosity>> The viscosity of the liquid skin cleansing composition at 25°C is not particularly limited and can be appropriately selected depending on the container used, but 4 mPa·s to 40 mPa·s is preferred, and 8 mPa·s to 30 mPa·s is more preferred. For example, when using a pump foamer container that can dispense foam by pressing down the nozzle, and one porous membrane each of 305 mesh and 200 mesh, the viscosity of the liquid skin cleansing agent composition is preferably 30 mPa·s or less, and more preferably 25 mPa·s or less, under the temperature conditions in which it is used. The viscosity can be measured, for example, using a BM-type viscometer (manufactured by Tokyo Keiki Co., Ltd.) at a sample temperature of 25°C, a rotation speed of 60 rpm, and by measuring the viscosity after 1 minute using rotor No. 1.

[0108] <<Container>> The aforementioned liquid skin cleansing composition is of the type that is filled into a foaming container and dispensed as a foam.

[0109] There are no particular restrictions on the foaming container, and it can be appropriately selected from known foaming containers, such as a non-gas foaming container and an aerosol container using a propellant and a pressure-resistant container. Among these, a non-gas foaming container is preferred.

[0110] The non-gas foam dispensing container is not particularly limited as long as it can dispense the liquid skin cleansing agent composition in a foamed state by mixing it with air, and can be appropriately selected according to the purpose. Examples include a squeeze foamer container that dispenses foam by squeezing the bottle body by hand, and a pump foamer container that dispenses foam by pressing down the nozzle. Such foamer containers can be manufactured by companies such as Yamato Seikan Co., Ltd. and Yoshino Kogyosho Co., Ltd. More specifically, foamer containers described in Japanese Patent Publication No. 7-315463, Japanese Patent Publication No. 8-230961, and Japanese Patent Publication No. 2005-193972 can be used.

[0111] The non-gas foam dispensing container has a foam-forming member, specifically a porous membrane for forming foam (preferably made of a plastic material such as nylon, polyester, or polyolefin), and foam is formed when the liquid skin cleansing composition passes through the porous membrane.

[0112] There are no particular restrictions on the mesh of the porous membrane, and it can be appropriately selected according to the purpose, but 100 mesh or more is preferred, 100 mesh to 400 mesh is more preferred, and 200 mesh to 305 mesh is particularly preferred. Furthermore, there are no particular restrictions on the number of porous membranes, and they can be appropriately selected according to the purpose, but from the viewpoint of improving foam performance, 2 to 4 membranes are preferred.

[0113] <<Manufacturing method>> There are no particular limitations on the method for producing the liquid skin cleansing composition, and it can be appropriately selected depending on the purpose. For example, it can be obtained by mixing component (A), component (B), and component (C), and optionally the other components, and purified water (added as a remainder so that the entire liquid skin cleansing composition is 100% by mass).

[0114] Specifically, it can be manufactured by dissolving component (A) and component (C) in purified water heated to 70°C to 80°C, then cooling it to 40°C or below, and finally adding component (B).

[0115] The liquid skin cleansing composition may be prepared using an apparatus. The apparatus is not particularly limited and can be appropriately selected depending on the purpose. Examples include a stirring device equipped with stirring blades that have shear force and can mix the entire mixture. There are no particular restrictions on the stirring blades, and they can be appropriately selected according to the purpose. Examples include propellers, turbines, and dispersers.

[0116] <<Application>> There are no particular restrictions on the area of ​​application of the liquid skin cleansing composition, and it can be appropriately selected according to the purpose. For example, it can be used on the whole body, face, hands, etc.

[0117] There are no particular restrictions on the use of the aforementioned liquid skin cleansing composition, and it can be appropriately selected according to the purpose. However, because it provides no tightness in the skin after towel drying and the persistence of this feeling, as well as good skin texture after towel drying, and has excellent dispensability from a foaming container, and can dispense foam of good quality, it can be used, for example, in body shampoos, body soaps, facial cleansing foams, hand soaps, foaming hand soaps, cleansing foams, and makeup removers. [Examples]

[0118] The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited in any way to these examples. In the following examples and comparative examples, unless otherwise specified, "%" indicates "mass%", the total amount is 100 mass%, and all components are values ​​converted to pure content. Furthermore, the mass ratio of the total content (mass%) of components (A) and (B) to the content (mass%) of component (C) [{(A)+(B)} / (C)], and the mass ratio of the content (mass%) of component (A) to the content (mass%) of component (B) [(A) / (B)], have been rounded to the first decimal place by two decimal places.

[0119] (Examples 1-23 and Comparative Examples 1-7) Liquid skin cleansing compositions of Examples 1-23 and Comparative Examples 1-7, with the compositions and content shown in Tables 1-4 below, were prepared according to the following methods. Purified water was heated to 70°C to 80°C, and the anionic surfactant (component A), lanolin alcohol (component C), and the common components polyoxyethylene cetyl ether and propylene glycol were added and dissolved. After cooling to below 40°C, the cationic polymer (component B) was added and mixed to obtain the mixture. The amount of purified water used initially was such that the mass of the mixture was 95% by mass of the mass of the liquid skin cleansing agent composition that would ultimately be obtained. Subsequently, if the pH was below a predetermined level, potassium hydroxide, a common component, was added to the mixture to adjust the pH to 7.5-10.1. Then, lauric acid amidopropyl betaine and fragrance, both common components, were added, and purified water was added to bring the total volume to 100% by mass to obtain the liquid skin cleansing compositions of Examples 1-23 and Comparative Examples 1-7.

[0120] When preparing the liquid skin cleansing agent composition, a propeller was used as the stirring blade, and the mixture was stirred using a 3-One motor (HEIDON BL1200, manufactured by Shinto Chemical Co., Ltd.). The pH was measured at 25°C using a pH meter (HM-30R, manufactured by TOA DKK).

[0121] The liquid skin cleansing compositions obtained in Examples 1-23 and Comparative Examples 1-7 were filled into containers with foam pump dispensers [discharge volume 3 mL, manufactured by Yoshino Kogyosho Co., Ltd.] and used for the following evaluations.

[0122] The liquid skin cleansing compositions of Examples 1-23 and Comparative Examples 1-7 were evaluated and judged as follows: "lack of tightness in the skin after towel drying," "duration of the lack of tightness in the skin after towel drying," "skin texture after towel drying," and "dispensing performance and foam quality from the pump." The results are shown in Tables 1-4 below.

[0123] <No feeling of tightness in the skin after towel-drying> Ten expert evaluators each took three pumps (approximately 9g) of the liquid skin cleansing compositions from Examples 1-23 and Comparative Examples 1-7 into their hands, washed their entire bodies, rinsed with 40°C warm water, and towel-dried. After resting for 30 minutes in a 25°C constant temperature room, they evaluated the "lack of tightness in the skin after towel-drying" based on the evaluation criteria below. The results were determined by calculating the average score of the ten evaluators and judging based on the judgment criteria below. -Evaluation criteria for "lack of tightness in the skin after towel drying"- 4 points: I don't feel any tightness at all. 3 points: No feeling of tightness. 2 points: I feel a slight tightness. 1 point: I felt a strong sense of tightness. - Criteria for determining "lack of tightness in the skin after towel-drying" - ◎: Average score is between 3.5 and 4.0 points. ○: Average score is 3.0 or higher but less than 3.5. △: Average score is between 2.0 and 3.0. ×: The average score is less than 2.0 points.

[0124] <Long-lasting feeling of no tightness in the skin after towel-drying> Ten expert evaluators took three pumps (approximately 9g) of the liquid skin cleansing compositions from Examples 1-23 and Comparative Examples 1-7 into their hands, washed their entire bodies, rinsed with 40°C warm water, and towel-dried. After resting for four hours in a 25°C constant temperature room, they evaluated the "persistence of the absence of skin tightness after towel-drying" based on the evaluation criteria below. The results were determined by calculating the average score of the ten evaluators and judging based on the judgment criteria below. -Evaluation criteria for "the duration of the feeling of skin tightness after towel-drying"- 4 points: I don't feel any tightness at all. 3 points: No feeling of tightness. 2 points: I feel a slight tightness. 1 point: I feel a strong sense of tightness. - Criteria for judging the "persistence of the feeling of tightness in the skin after towel-drying" - ◎: Average score is between 3.5 and 4.0 points. ○: Average score is 3.0 or higher but less than 3.5. △: Average score is between 2.0 and 3.0. ×: The average score is less than 2.0 points.

[0125] <Skin texture after towel-drying> Before using the liquid skin cleansing compositions of Examples 1-23 and Comparative Examples 1-7, skin replicas were taken from 10 subjects (men and women aged 25-39). The skin replicas were copies of the skin surface shape. The 10 subjects rested in a constant temperature room at 25°C for 30 minutes, then applied silicone rubber (product name: SILFLO, manufactured by Flexico) as a replica agent to a 1 cm x 1 cm area on the inner side of their forearm. After being left to dry for 15 minutes, the replicas were peeled off. The maximum depth (μm) of the maximum wrinkles was measured on the obtained skin replicas using a microscope (digital microscope VHX-900, manufactured by Keyence Corporation), and this value was defined as the "initial value".

[0126] Next, 10 subjects took 3 pumps (approximately 9g) of the liquid skin cleansing compositions of Examples 1-23 and Comparative Examples 1-7 into their hands once a day for 7 consecutive days, washed their entire bodies, rinsed with 40°C warm water, and towel-dried. On the 7th day (7th time) after towel-drying from the start of use of the liquid skin cleansing compositions of Examples 1-23 and Comparative Examples 1-7, they rested in a 25°C constant temperature room for 30 minutes, and then skin replicas were taken from the same area on the inner forearm where the initial values ​​were measured, using the same method as described above. The maximum depth (μm) of the maximum wrinkles was measured on the obtained skin replicas using a microscope (digital microscope VHX-900), and this value was defined as the "evaluation value".

[0127] The percentage change (%) was calculated from the initial value and the evaluation value based on the following formula (1), and the "skin texture after towel drying" was evaluated. The results were determined by calculating the average of the percentage change (%) for 10 people and judging based on the following criteria. Rate of change (%) = (Evaluation value - Initial value) / Initial value × 100 ... Equation (1) - Criteria for judging "skin texture after towel drying" - ◎: Rate of change is 120% or more ○: The rate of change is between 105% and less than 120%. △: The rate of change is between 95% and 105%. ×: The rate of change is less than 95%.

[0128] <Discharge properties and foam quality from the pump> Ten expert evaluators evaluated the "dispensing performance and foam quality" of the liquid skin cleansing compositions of Examples 1-23 and Comparative Examples 1-7, which were filled into a foam pump dispenser container [dispensing volume 3 mL, manufactured by Yoshino Kogyosho Co., Ltd.] and dispensed at 25°C, based on the ease of pressing the pump and the texture of the foam during dispensing, according to the evaluation criteria below. The results were determined by calculating the average score of the ten evaluators and judging according to the judgment criteria below. - Evaluation criteria for "discharge performance and foam quality from the pump" - 4 points: The pump is easy to press and dispenses fine bubbles. 3 points: The pump is easy to press, but there is a slight mixture of large foam particles. 2 points: The pump is a little difficult to press, and there are many large bubbles mixed in. 1. The pump is very difficult to press, and only large bubbles are dispensed. - Criteria for judging "discharge performance and foam quality from the pump" - ◎: Average score is between 3.5 and 4.0 points. ○: Average score is 3.0 or higher but less than 3.5. △: Average score is between 2.0 and 3.0. ×: The average score is less than 2.0 points.

[0129] [Table 1]

[0130] [Table 2]

[0131] [Table 3]

[0132] [Table 4]

[0133] Details of each component used in Examples 1-23 and Comparative Examples 1-7 are shown in Table 5 below.

[0134] [Table 5] *1: Potassium myristate was prepared by neutralizing myristic acid (NAA-142, manufactured by NOF Corporation) with potassium hydroxide (manufactured by AGC Inc., liquid caustic potash). *2: Potassium laurate was prepared by neutralizing lauric acid (NAA-122, manufactured by NOF Corporation) with potassium hydroxide (manufactured by AGC Inc., liquid caustic potash). *3: Potassium palmitate was prepared by neutralizing palmitic acid (NAA-160, manufactured by NOF Corporation) with potassium hydroxide (liquid caustic potash, manufactured by AGC Inc.). *4: Potassium stearate was prepared by neutralizing stearic acid (NAA-180, manufactured by NOF Corporation) with potassium hydroxide (liquid caustic potash, manufactured by AGC Inc.).< / ph>

Claims

1. (A) Anionic surfactants, (B) A cationic polymer containing 40 mol% or more of structural units derived from dimethyldiallylammonium chloride, (C) Lanolin alcohol and It contains, The mass ratio of the total content of component (A) and component (B) to the content of component (C) [{(A) + (B)} / (C)] is between 40 and 1,050. The mass ratio of the content of component (A) to the content of component (B) [(A) / (B)] is 24.2 to 80. A liquid skin cleansing composition characterized by being filled into a foaming container.

2. The liquid skin cleansing composition according to Claim 1, wherein the content of component (A) is 12% to 20% by mass, the content of component (B) is 0.2% to 0.8% by mass, and the content of component (C) is 0.002% to 0.4% by mass.

3. The liquid skin cleansing composition according to Claim 1, wherein the viscosity at 25°C is 4 mPa·s to 40 mPa·s.

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