Liquid skin cleansing agent composition

Abstract

To provide a liquid skin cleansing agent composition that avoids skin irritation, gives a moist feel to the skin after towel drying without causing tightness or stickiness, and offers a good balance between dense foam and easy foam breaking.SOLUTION: A liquid skin cleansing agent composition includes (A) an amino acid-based surfactant, (B) a cationic polymer containing 40 mol% or more of a dimethyldiallylammonium chloride-derived structural unit, (C) a cationized polysaccharide, and (D) at least one dextrin of hydroxyalkylated cyclodextrin and highly branched cyclic dextrin.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 required to have good foaming performance, such as the density of the foam. In recent years, there has been a growing demand for products that provide a moist feeling to the skin after towel drying, prevent tightness or stickiness after towel drying, and are non-irritating to the skin.

[0003] For example, cleansing compositions have been disclosed that use amino acid-based surfactants as the main cleansing component and contain N-acyl amino acid salts with reduced skin irritation, various surfactants, cationic polymers, and water-soluble polymers (see Patent Document 1); skin cleansing compositions that contain N-acyl amino acid salts, solid or semi-solid oils, and cationized polysaccharides (see Patent Document 2); and skin cleansing compositions that contain amino acid-based surfactants, cationic polymers, and amidosulfobetaine-type amphoteric surfactants (see Patent Document 3). However, these skin cleansing compositions have not been sufficiently satisfactory in terms of foam density, skin moisture after towel drying, lack of stickiness after towel drying, rinsing speed, and foam breakage.

[0004] Furthermore, in order to solve the global challenges we will face in the future and to build a sustainable future, there is a growing awareness at the consumer level of reducing environmental impact. However, liquid skin cleansing compositions with good foaming performance have poor foam-breaking properties, which means that rinsing time to wash away the foam is long, requiring the use of large amounts of water, and thus they are not suitable from the perspective of efforts to reduce environmental impact.

[0005] Therefore, there is a need for a liquid skin cleansing agent composition that is non-irritating to the skin, leaves the skin feeling moisturized after towel drying, prevents tightness and stickiness after towel drying, and achieves both good foaming performance, such as dense foam, and excellent foam-breaking properties. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2019-1724 [Patent Document 2] Japanese Patent Publication No. 2013-163658 [Patent Document 3] Japanese Patent Publication No. 2020-117469 [Overview of the project] [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 is non-irritating to the skin, provides a moist feeling to the skin after towel drying, eliminates tightness and stickiness to the skin after towel drying, and achieves both dense foam and excellent foam-breaking properties. [Means for solving the problem]

[0008] The present inventors conducted diligent studies to achieve the above objectives and found that a liquid skin cleansing composition containing (A) an amino acid-based surfactant, (B) a cationic polymer containing 40 mol% or more of structural units derived from dimethyldiallylammonium chloride, (C) a cationized polysaccharide, and (D) at least one of hydroxyalkylated cyclodextrin and highly branched cyclic dextrin is non-irritating to the skin, provides a moist feeling to the skin after towel drying, eliminates tightness and stickiness after towel drying, and achieves both dense foam and excellent foam-breaking properties, 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) Amino acid-based surfactants, (B) A cationic polymer containing 40 mol% or more of structural units derived from dimethyldiallylammonium chloride, (C) Cationized polysaccharides and, (D) A dextrin that is at least one of hydroxyalkylated cyclodextrin and a highly branched cyclic dextrin, This is a liquid skin cleansing composition characterized by containing [a specific ingredient]. <2> The mass ratio [(D) / (A)] of the content of at least one of the dextrins (D) hydroxyalkylated cyclodextrin and highly branched cyclic dextrin to the content of the amino acid-based surfactant is 0.005 to 0.15. <1> This is a liquid skin cleansing composition as described above. <3> (E) The above further contains at least one amphoteric surfactant selected from aminopropionic acid-based amphoteric surfactants and betaine-based amphoteric surfactants. <1> or <2> This is a liquid skin cleansing composition as described above. <4> The content of component (A) is 1% to 10% by mass, the content of component (B) is 0.1% to 0.8% by mass, the content of component (C) is 0.1% to 0.8% by mass, and the content of component (D) is 0.05% to 0.09% by mass, <1> from <3> This is a liquid skin cleansing composition as described in any of the above. <5> The content of component (E) is 3% by mass to 15% by mass, <3> from <4> This is a liquid skin cleansing composition as described in any of the above. <6> The former container is filled with the above <1> from <5> 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 of the conventional method and achieve the aforementioned objectives, and to provide a liquid skin cleansing composition that is non-irritating to the skin, provides a moist feeling to the skin after towel drying, eliminates tightness and stickiness to the skin after towel drying, and achieves both dense foam and excellent foam-breaking properties. [Modes for carrying out the invention]

[0011] (Liquid skin cleansing agent composition) The liquid skin cleansing composition of the present invention contains (A) an amino acid-based surfactant, (B) a cationic polymer containing 40 mol% or more of structural units derived from dimethyldiallylammonium chloride, (C) a cationized polysaccharide, and (D) at least one dextrin from hydroxyalkylated cyclodextrin and highly branched cyclic dextrin, and preferably further contains (E) at least one amphoteric surfactant selected from aminopropionic acid-based amphoteric surfactants and betaine-based amphoteric surfactants, and may further contain other components as needed.

[0012] <(A) Amino acid-based surfactants> The amino acid-based surfactant as component (A) is included primarily to suppress skin irritation and to improve the density of the foam and the moist feeling of the skin after towel drying. In this specification, "density of foam" means that the foam has a firm rebound when pressed between both hands, and that the foam that adheres to the hands does not easily drip even when the hands are turned upside down.

[0013] There are no particular restrictions on the amino acid-based surfactant of component (A) and it can be appropriately selected depending on the purpose, but amino acid-based surfactants having an amino acid structure such as glycine, glutamic acid, methylalanine, aspartic acid, or methyltaurine in the hydrophilic part and an acyl group with an alkyl chain length of 8 to 18 in the hydrophobic part are preferred, and N-acylglycine salts are more preferred. These may be used individually or in combination of two or more.

[0014] The acyl group is not particularly limited and can be appropriately selected according to the purpose. For example, lauroyl group, myristoyl group, coconut fatty acid acyl group (cocoyl group), octanoyl group, decanoyl group, palmitoyl group, stearoyl group, oleoyl group, linoleoyl group, etc. can be mentioned.

[0015] Specific examples of the amino acid-based surfactant of the component (A) include N-lauroyl-N-methyl-β-alanine salt, N-myristoyl-N-methyl-β-alanine salt, N-cocoyl-N-methyl-β-alanine salt, N-lauroyl glutamate salt, N-myristoyl glutamate salt, N-cocoyl glutamate salt, N-cocoyl glycine salt, N-lauroyl glycine salt, N-myristoyl glycine salt, N-lauroyl aspartate salt, N-cocoyl methyltaurine salt, etc. Among these, as the amino acid-based surfactant of the component (A), N-cocoyl glycine salt is preferable.

[0016] The counter ion of the amino acid-based surfactant of the component (A) is not particularly limited and can be appropriately selected according to the purpose. For example, alkali metal ions such as sodium ion and potassium ion; ammonium ion; alkanolamines such as monoethanolamine, diethanolamine, and triethanolamine, etc. can be mentioned.

[0017] Specific examples of the N-cocoyl glycine salt include N-cocoyl glycine potassium, N-cocoyl glycine sodium, N-cocoyl glycine triethanolamine, etc.

[0018] For the amino acid-based surfactant of the component (A), those synthesized appropriately may be used, or commercially available products may be used. Examples of commercially available amino acid-based surfactants of component (A) include, by trade name, Alanon® ALE (N-lauroyl-N-methyl-β-alanine sodium), Alanon® AME (N-myristoyl-N-methyl-β-alanine sodium), Alanon® ACE (N-cocoyl-N-methyl-β-alanine sodium) (all manufactured by Kawaken Fine Chemical Co., Ltd.), AminoSurfact® ALMS-P1 (N-lauroyl glutamate sodium), AminoSurfact® AMMS- Examples include P1 (N-myristoyl glutamate sodium) (manufactured by Asahi Kasei Finechem Corporation), AminoSurfact® ACDS-L (N-cocoyl glutamate sodium), Aminoformer® FLDS-L (N-lauroyl aspartate sodium) (manufactured by Asahi Kasei Finechem Corporation), Amilite® GCK-12K (N-cocoyl glycine potassium, manufactured by Ajinomoto Co., Inc.), and Diapon® K-SF (N-cocoyl methyl taurate sodium, manufactured by NOF Corporation).

[0019] There are no particular restrictions on the content of the amino acid-based surfactant in component (A) above, and it can be appropriately selected depending on the purpose. However, from the viewpoint of foam density, the moist feeling of the skin after towel drying, and suppression of skin irritation, it is preferably 0.5% to 15% by mass, and more preferably 1% to 10% by mass, based on the total amount of the liquid skin cleansing composition. When the content of component (A) is 0.5% by mass or more, the foam density and the moist feeling of the skin after towel drying are good, and when it is 15% by mass or less, skin irritation can be suitably suppressed.

[0020] <(B) Cationic polymer containing 40 mol% or more of structural units derived from dimethyldiallylammonium chloride> The cationic polymer containing 40 mol% or more of structural units derived from dimethyldiallylammonium chloride as component (B) is mainly included to improve the moisturizing effect on the skin after towel drying.

[0021] The cationic polymer of component (B) 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 copolymers and dimethyldiallylammonium chloride-acrylic acid copolymers. These may be used individually or in combination of two or more.

[0022] 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.

[0023] 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 moist feeling of the skin after towel drying, 65 mol% or more is preferred, and 95 mol% or more is more preferred. The dimethyldiallylammonium chloride-acrylic acid copolymer may be used alone or two or more may be used in combination.

[0024] 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.)

[0025] There are no particular restrictions on the weight-average molecular weight of the cationic polymer of component (B) above, and it can be appropriately selected depending on the purpose. However, from the viewpoint of the moist feeling of the skin after towel drying, 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).

[0026] The viscosity of a solution of the cationic polymer of component (B) with a solid content of 30% to 44% by mass at 25°C is not particularly limited and can be appropriately selected depending on the purpose, but 10 mPa·s to 15,000 mPa·s is preferred, and 20 mPa·s to 12,000 mPa·s is more preferred. The viscosity can be measured, for example, using a Brookfield viscometer LVF (manufactured by Brookfield).

[0027] 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.

[0028] MERQUAT 100 (Ingredients: Dimethyldiallylammonium chloride copolymer, 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.

[0029] Marquardt 106 (Ingredient name: Dimethyldiallylammonium chloride copolymer, 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 at a rate of 60 revolutions per minute.

[0030] Marcoat 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 (B1), 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.

[0031] 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 (B1), 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, with a rotor of spindle No. 4, and under conditions of 30 revolutions per minute.

[0032] Among these, as the cationic polymer of component (B), Mercoat 100, Mercoat 295, and Mercoat 280 are preferred in terms of the moist feeling of the skin after towel drying.

[0033] There are no particular restrictions on the content of the cationic polymer in component (B) and it can be appropriately selected depending on the purpose. However, from the viewpoint of providing a moist feeling to the skin after towel drying and suppressing the feeling of tightness in the skin after towel drying, it is preferably 0.1% to 1% by mass, and more preferably 0.1% to 0.8% by mass, based on the total amount of the liquid skin cleansing composition. When the content of component (B) is 0.1% by mass or more, the moist feeling of the skin after towel drying is good, and when it is 1% by mass or less, the feeling of tightness in the skin after towel drying can be suitably suppressed.

[0034] <(C) Cationized polysaccharides> The cationized polysaccharide as component (C) is included primarily to improve the density of the foam and to suppress the feeling of tightness in the skin after towel drying.

[0035] There are no particular restrictions on the cationized polysaccharide of component (C) and it can be appropriately selected depending on the purpose. Examples include cationized cellulose, cationized guar gum, cationized xanthan gum, and cationized locust bean gum. These may be used individually or in combination of two or more. Among these, cationized cellulose is preferred as the cationized polysaccharide of component (C) because it produces a dense foam and suppresses the feeling of tightness in the skin after towel drying.

[0036] The cationized polysaccharide of component (C) may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available cationized polysaccharides of component (C) mentioned above include, by trade name, Catinal HC-100 (cationized cellulose, manufactured by Toho Chemical Industry Co., Ltd.), Labor Gum (registered trademark) CG-M (cationized guar gum, manufactured by Sumitomo Pharma Food & Chemical Co., Ltd.), Labor Gum (registered trademark) CX (cationized xanthan gum, manufactured by Sumitomo Pharma Food & Chemical Co., Ltd.), and Catinal CLB-100 (cationized locust bean gum, manufactured by Toho Chemical Industry Co., Ltd.).

[0037] There are no particular restrictions on the content of the cationized polysaccharide in component (C) above, and it can be appropriately selected depending on the purpose. However, from the viewpoint of foam density, the moist feeling of the skin after towel drying, and suppression of tightness of the skin after towel drying, it is preferable that the content be 0.1% to 1% by mass, and more preferably 0.1% to 0.8% by mass, relative to the total amount of the liquid skin cleansing composition. When the content of component (C) is 0.1% by mass or more, the foam density is good and the tightness of the skin after towel drying can be suitably suppressed, and when it is 1% by mass or less, the moist feeling of the skin after towel drying is good.

[0038] <(D) At least one dextrin from hydroxyalkylated cyclodextrin and highly branched cyclic dextrin> At least one of the hydroxyalkylated cyclodextrin and highly branched cyclic dextrin as component (D) is included primarily to improve foam-breaking properties. In this specification, "foam-breaking property" means the property of the foam that is formed to disappear. In particular, the foam-breaking property of the liquid skin cleansing agent composition means the property of the foam that is formed by the liquid skin cleansing agent composition to disappear when water is added, and can be evaluated by the method described in the examples below.

[0039] <<Hydroxyalkylated cyclodextrin>> The hydroxyalkylated cyclodextrin is a compound in which glucose is linked cyclically by α-1,4-glucosidic bonds, and in which a hydroxyalkyl group is introduced to some of the hydroxyl groups of the cyclodextrin. Examples include compounds represented by the following general formula (D1).

[0040] [ka] In the above general formula (D1), R 1 , R 2 , and R 3each independently represents a hydrogen atom, a hydroxymethyl group, a hydroxyethyl group, a hydroxypropyl group, or a hydroxybutyl group; n represents an integer from 6 to 8, with 7 being preferred. However, the said R 1 the said R 2 and the said R 3 will not simultaneously become hydrogen atoms.

[0041] By subjecting at least one of the said R 1 the said R 2 and the said R 3 to a substitution reaction, hydroxyalkylated cyclodextrins such as hydroxypropyl cyclodextrin can be obtained.

[0042] Regarding the substitution degree of the hydroxyalkyl group of the said hydroxyalkylated cyclodextrin, from the perspective of defoaming properties, 1 to 14 per cyclodextrin is preferred. When the substitution degree is 1 to 14 per cyclodextrin, the defoaming properties are good.

[0043] There are no particular restrictions on the cyclodextrin part of the said hydroxyalkylated cyclodextrin, and it can be appropriately selected according to the purpose. For example, α-cyclodextrin in which 6 glucose molecules are cyclically bonded, β-cyclodextrin in which 7 glucose molecules are cyclically bonded, γ-cyclodextrin in which 8 glucose molecules are cyclically bonded, etc. can be mentioned. Among these, β-cyclodextrin is preferred.

[0044] The hydroxyalkylated cyclodextrin is not particularly limited and can be appropriately selected depending on the purpose. Examples include hydroxymethyl-α-cyclodextrin, hydroxymethyl-β-cyclodextrin, hydroxymethyl-γ-cyclodextrin, hydroxyethyl-α-cyclodextrin, hydroxyethyl-β-cyclodextrin, hydroxyethyl-γ-cyclodextrin, hydroxypropyl-α-cyclodextrin, hydroxypropyl-β-cyclodextrin, hydroxypropyl-γ-cyclodextrin, hydroxybutyl-α-cyclodextrin, hydroxybutyl-β-cyclodextrin, and hydroxybutyl-γ-cyclodextrin. These may be used individually or in combination of two or more. Among these, hydroxypropyl-β-cyclodextrin is preferred as the hydroxyalkylated cyclodextrin from the viewpoint of antifoaming properties.

[0045] The hydroxyalkylated cyclodextrin may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available hydroxyalkylated cyclodextrins include, for example, Celldex® HP-β-CD (hydroxypropyl-β-cyclodextrin, manufactured by Nippon Shokuhin Kako Co., Ltd.) under the trade name.

[0046] <<Highly branched cyclic dextrin>> The aforementioned highly branched cyclic dextrin is also called "cluster dextrin" (a registered trademark of Glico Nutrition Foods Co., Ltd.)

[0047] The highly branched cyclic dextrin refers to a glucan having an internally branched cyclic structure and an externally branched structure, with a weight-average degree of polymerization in the range of 50 to 10,000. Here, the internally branched cyclic structure portion refers to the cyclic structure portion formed by α-1,4-glucosidic bonds and α-1,6-glucosidic bonds. The aforementioned external branched structure portion refers to the glucan, which is an annular structure portion bonded to the internal branched annular structure portion.

[0048] The aforementioned highly branched cyclic dextrin preferably has a weight-average molecular weight of 30,000 to 1,000,000, and more preferably mainly comprises dextrin with a weight-average degree of polymerization of about 2,500, having one cyclic structure within the molecule, to which numerous glucan chains are further bonded. The weight-average molecular weight of the aforementioned highly branched cyclic dextrin can be measured using gel filtration chromatography-multi-angle light scattering (GPC-MALLS) analysis under the following conditions. [Measurement conditions] Measurement device: Gel Permeation Chromatography System (manufactured by Shimadzu Corporation) Measurement sample solution: The pure concentration of component (D) above is approximately 1,000 ppm (diluted with mobile phase). Column: Column for polar organic solvents (TSK-GELα column, manufactured by Tosoh Corporation) Mobile phase: 0.5 mol / L sodium perchlorate solution Measurement wavelength: approx. 633nm Detector: Multi-angle light scattering detector (MALLS) Standard product: Polyethylene glycol with known molecular weight

[0049] The aforementioned highly branched cyclic dextrin can be produced, for example, by using starch as a raw material and reacting it with an enzyme called a branching enzyme. The raw material, starch, consists of amylose, in which glucose is linked in a linear chain by α-1,4-glucosidic bonds, and amylopectin, which has a structure that is intricately branched by α-1,6-glucosidic bonds. The amylopectin is a macromolecule in which many cluster structures are linked together. The branching enzyme used is a glucan transferase widely distributed in plants, animals, and microorganisms, and it acts on the junctions of the amylopectin cluster structure, catalyzing the reaction that cyclicizes it. More specifically, the highly branched cyclic dextrin can be, for example, a glucan having an internally branched cyclic structure portion and an externally branched structure portion, as described in Japanese Patent Publication No. 8-134104, with a weight-average degree of polymerization in the range of 50 to 10,000. In this specification, the highly branched cyclic dextrin can be understood with reference to the description in Japanese Patent Publication No. 8-134104.

[0050] The aforementioned highly branched cyclic dextrin has a specific structure as described above and a large weight-average degree of polymerization (molecular weight), and is different from general cyclodextrins such as α-cyclodextrin (6 glucose units), β-cyclodextrin (7 glucose units), and γ-cyclodextrin (8 glucose units), which have 6 to 8 glucose units linked together. Furthermore, hydroxyalkylated cyclodextrin is a cyclodextrin in which a hydroxyalkyl group is introduced to some of the hydroxyl groups, and is different from the highly branched cyclic dextrin mentioned above.

[0051] The aforementioned highly branched cyclic dextrin may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available highly branched cyclic dextrins include, for example, Cluster Dextrin (a registered trademark of Glico Nutrition Foods Co., Ltd., manufactured by Glico Nutrition Foods Co., Ltd.) under the trade name.

[0052] Among these, hydroxyalkylated cyclodextrin is preferred as component (D) from the viewpoint of antifoaming properties, and hydroxypropyl-β-cyclodextrin is more preferred.

[0053] There are no particular restrictions on the content of at least one of the hydroxyalkylated cyclodextrin and highly branched cyclic dextrin as component (D), and it can be appropriately selected depending on the purpose. However, from the viewpoint of good foam density and foam-breaking properties, it is preferably 0.01% to 0.09% by mass, and more preferably 0.05% to 0.09% by mass, based on the total amount of the liquid skin cleansing composition. When the content of component (D) is 0.01% by mass or more, foam-breaking properties are good, and when it is 0.09% by mass or less, foam density is good.

[0054] <<Mass ratio [(D) / (A)]>> The mass ratio [(D) / (A)] of the content (mass%) of at least one of hydroxyalkylated cyclodextrin and highly branched cyclic dextrin in component (D) to the content (mass%) of amino acid-based surfactant in component (A) is not particularly limited and can be appropriately selected depending on the purpose, but from the viewpoint of rinsing speed and suppression of stickiness after towel drying, 0.005 to 0.15 is preferred and 0.01 to 0.09 is more preferred. When the mass ratio [(D) / (A)] is 0.005 or more, rinsing is fast, and when it is 0.15 or less, stickiness after towel drying can be suitably suppressed.

[0055] <(E) At least one amphoteric surfactant selected from aminopropionic acid-based amphoteric surfactants and betaine-based amphoteric surfactants> It is preferable that at least one amphoteric surfactant selected from aminopropionic acid-based amphoteric surfactants and betaine-based amphoteric surfactants be included as component (E) in order to further improve the density of the foam.

[0056] <<Aminopropionic acid-based amphoteric surfactant>> The aminopropionic acid-based amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include laurylaminopropionate, laurylaminodipropionate, and N-coconut oil fatty acid acyl-N'-carboxyethyl-N'-hydroxyethylethylenediamine salt. These may be used individually or in combination of two or more.

[0057] There are no particular restrictions on the counterion of the aminopropionic acid-based amphoteric surfactant, and it can be appropriately selected depending on the purpose. Examples include alkali metal ions such as sodium ions and potassium ions; ammonium ions; and alkanolamines such as monoethanolamine, diethanolamine, and triethanolamine. Among these, sodium ions are preferred as the counterion of the aminopropionic acid-based amphoteric surfactant.

[0058] <<Betaine-based amphoteric surfactant>> The betaine-based amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include imidazoline-type amphoteric surfactants, carbobetine-type amphoteric surfactants, and sulfobetaine-type amphoteric surfactants. These may be used individually or in combination of two or more.

[0059] -Imidazolin-type amphoteric surfactant- The imidazoline-type amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include amidoamine-type amphoteric surfactants.

[0060] Examples of the amidoamine-type amphoteric surfactants include coconut oil alkyl-N-hydroxyethylimidazolinium betaine and 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine.

[0061] -Carbobetaine-type amphoteric surfactant- The aforementioned carbobetaine-type amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include alkylbetaine-type amphoteric surfactants and alkylamidebetaine-type amphoteric surfactants.

[0062] Examples of the alkylbetaine-type amphoteric surfactants include lauryldimethylaminoacetic acid betaine and stearyldimethylaminoacetic acid betaine.

[0063] Examples of the alkylamide betaine type amphoteric surfactants include coconut oil fatty acid amidopropyl betaine, lauric acid amidopropyl betaine, and lauric acid amidopropyl dimethylaminoacetic acid betaine.

[0064] -Sulfobetaine-type amphoteric surfactant- The sulfobetaine-type amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include alkyl sulfobetaine-type amphoteric surfactants and alkyl hydroxy sulfobetaine-type amphoteric surfactants.

[0065] Examples of the alkyl sulfobetaine-type amphoteric surfactants include coconut oil fatty acid dimethyl sulfopropyl betaine and lauramidopropyl hydroxysultaine.

[0066] Examples of the alkylhydroxysulfobetaine-type amphoteric surfactant include laurylhydroxysulfobetaine.

[0067] Among these, as the at least one amphoteric surfactant selected from the aminopropionic acid-based amphoteric surfactants and betaine-based amphoteric surfactants of component (E), laurylaminopropionate, laurylaminodipropionate, coconut oil fatty acid amidopropyl betaine, lauric acid amidopropyl betaine, and lauric acid amidopropyl dimethylaminoacetic acid betaine are preferred in terms of foam density, and laurylaminopropionate and lauric acid amidopropyl dimethylaminoacetic acid betaine are more preferred.

[0068] The amphoteric surfactant of component (E) above, selected from aminopropionic acid-based amphoteric surfactants and betaine-based amphoteric surfactants, may be synthesized as appropriate or a commercially available product may be used. Examples of commercially available amphoteric surfactants selected from aminopropionic acid-based amphoteric surfactants and betaine-based amphoteric surfactants of component (E) include, by trade name, Levon APL (β-sodium laurylaminopropionate, manufactured by Sanyo Chemical Industries, Ltd.), Taipol Soft LDP-30 (sodium laurylaminodipropionate, manufactured by Taiko Oil & Fat Chemical Industry Co., Ltd.), Softazolin (registered trademark) NS (N-coconut oil fatty acid acyl-N'-carboxyethyl-N'-hydroxyethylethylenediamine sodium, manufactured by Kawaken Fine Chemical Co., Ltd.), Softazolin (registered trademark) CH (2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, manufactured by Kawaken Fine Chemical Co., Ltd.), and Examples include Amhitol 24B (lauryldimethylaminoacetic acid betaine, manufactured by Kao Corporation), Amhitol 86B (stearyldimethylaminoacetic acid betaine, manufactured by Kao Corporation), Softazolin® CPB-R (lauramidopropyl betaine, manufactured by Kawaken Fine Chemicals Co., Ltd.), Amhitol 20AB (lauramidopropyl betaine, manufactured by Kao Corporation), Enerdicol L-30B (lauramidopropyl dimethylaminoacetic acid betaine, manufactured by Lion Specialty Chemicals Co., Ltd.), Softazolin® LSB (lauramidopropyl hydroxysultaine, manufactured by Kawaken Fine Chemicals Co., Ltd.), and Amhitol 20HD (lauryl hydroxysulfobetaine, manufactured by Kao Corporation).

[0069] The content of at least one of the aminopropionic acid-based amphoteric surfactants and betaine-based amphoteric surfactants of component (E) is not particularly limited and can be appropriately selected depending on the purpose. However, from the viewpoint of good foam density and a moist feeling of the skin after towel drying, it is preferably 1% to 20% by mass, and more preferably 3% to 15% by mass, based on the total amount of the liquid skin cleansing composition. When the content of component (E) is 1% by mass or more, the foam density is good, and when it is 20% by mass or less, the moist feeling of the skin after towel drying is good.

[0070] <Other ingredients> In addition to components (A), (B), (C), (D), and (E) described above, the liquid skin cleansing composition may contain other components as needed, provided that they do not impair the effects of the present invention.

[0071] The aforementioned other components are not particularly limited and can be appropriately selected depending on the purpose. Examples include surfactants other than components (A) and (E), water-soluble polymer compounds other than components (B) and (C), oils, silicones, alcohols, lanolin derivatives, protein derivatives, drugs (e.g., vitamins, anti-inflammatory agents, etc.), humectants, bactericides, preservatives, pH adjusters, antioxidants, chelating agents, UV absorbers or scatterers, plant and animal extracts or derivatives thereof, chelating agents, 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.

[0072] -Surfactants other than component (A) and component (E)- There are no particular restrictions on surfactants other than component (A) and component (E), and they can be appropriately selected depending on the purpose. Examples include anionic surfactants other than component (A), amphoteric surfactants other than component (E), nonionic surfactants, cationic surfactants, etc. These may be used individually or in combination of two or more.

[0073] Other than component (A), there are no particular limitations on the anionic surfactants, and examples include ether carboxylic acid type anionic surfactants such as polyoxyethylene alkyl ether carboxylic acid or its salt, polyoxyethylene hydroxy ether carboxylic acid or its salt, and polyoxyethylene alkylamide ether carboxylic acid or its salt. 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 examples include 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] The content of surfactants other than component (A) and component (E) 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.

[0077] -Water-soluble polymer compounds other than component (C)- Other than component (C) mentioned above, there are no particular restrictions on the water-soluble polymer compounds, and they can be appropriately selected depending on the purpose. Examples include polyethylene glycol, highly polymerized polyethylene glycol, polyvinyl alcohol, polyglutamic acid, carboxyvinyl polymer, acrylic acid / alkyl methacrylate copolymer, and alkyl acrylate copolymer. These may be used individually or in combination of two or more.

[0078] The content of water-soluble polymer compounds 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.

[0079] -Oil- There are no particular restrictions on the oils mentioned above, and they 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; natural and synthetic fatty acids such as oleic acid, isostearic acid, and behenic acid; 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 types.

[0080] 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.

[0081] -Alcoholic beverages- There are no particular restrictions on the alcohols mentioned above; they can be selected as appropriate depending on the purpose, and may be lower alcohols or higher alcohols. Specific examples of the aforementioned alcohols 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.

[0082] The amount of alcohols 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.

[0083] -Lanolin derivatives- The lanolin derivative is not particularly limited and can be appropriately selected depending on the purpose. Examples include lanolin alcohol, lanolin alcohol fatty acid ester, lanolin alcohol polyethylene glycol ether, and lanolin alcohol polypropylene glycol ether. These may be used individually or in combination of two or more.

[0084] The content of the lanolin derivative 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.

[0085] -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, γ-oryzanol, α-lipoic acid, orotic acid, or derivatives thereof. These may be used individually or in combination of two or more.

[0086] 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.

[0087] -Anti-inflammatory drugs- There are no particular restrictions on the anti-inflammatory agent, and it can be appropriately selected depending on the purpose. Examples include dipotassium glycyrrhizinate, stearyl glycyrrhetinate, allantoin, monoammonium glycyrrhizinate, and glycyrrhetinic acid. These may be used individually or in combination of two or more.

[0088] The content of the anti-inflammatory component 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 0.01% to 0.5% by mass relative to the total amount of the liquid skin cleansing composition.

[0089] -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.

[0090] 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.

[0091] - 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.

[0092] 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.

[0093] - pH adjuster - The pH adjusting agent is not particularly limited and can be appropriately selected depending on the purpose. Examples include sodium hydroxide, potassium hydroxide, citric acid, hydrochloric acid, succinic acid, triethanolamine, aqueous ammonia, triisopropanolamine, monoethanolamine, phosphoric acid, and glycolic acid. These may be used individually or in combination of two or more.

[0094] 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.

[0095] -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.

[0096] 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.

[0097] -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.

[0098] 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.

[0099] -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.

[0100] 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.

[0101] - 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, or derivatives thereof. These may be used individually or in combination of two or more.

[0102] 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.

[0103] -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 powder and polyethylene powder. These may be used individually or in combination of two or more.

[0104] 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.

[0105] --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 8.0 to 10.0 is preferred, and 8.8 to 9.8 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 Co., Ltd.).

[0106] --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. When the viscosity of the liquid skin cleansing composition at 25°C is 4 mPa·s to 40 mPa·s, it can be suitably used in foaming containers. 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.

[0107] --container-- There are no particular restrictions on the container for containing the liquid skin cleansing composition, and it can be appropriately selected depending on the purpose. For example, a foaming container can be used. By filling the foaming container with the liquid skin cleansing composition, the liquid skin cleansing composition can be dispensed in a foamy form.

[0108] 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.

[0109] 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.

[0110] The non-gas foam dispensing container has a foam-forming member, specifically a porous membrane for forming foam, and foam is formed when the liquid skin cleansing composition passes through the porous membrane.

[0111] There are no particular restrictions on the material of the porous membrane, and it can be appropriately selected depending on the purpose, but plastic materials such as nylon, polyester, and polyolefin are preferred.

[0112] There are no particular restrictions on the mesh of the porous membrane, and it can be appropriately selected depending on 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.

[0113] 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.

[0114] In the non-gas type foam dispensing container, there are no particular restrictions on the mixing ratio of the liquid skin cleansing agent composition with air, and it can be appropriately selected depending on the purpose. However, a liquid skin cleansing agent composition:air (volume ratio) of 1:8 to 1:15 is preferred, and 1:10 to 1:13 is particularly preferred.

[0115] --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), component (C), and component (D), preferably further component (E), and optionally the other components and purified water (added as a remainder so that the entire liquid skin cleansing composition is 100% by mass).

[0116] Specifically, it can be produced by separately heating and dissolving the components (A), (B), (C), and (D) with purified water in purified water, preferably further adding component (E), and any other components as needed, and mixing them together.

[0117] 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.

[0118] --Applications-- 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.

[0119] 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 is non-irritating to the skin, provides a moist feeling to the skin after towel drying, does not leave the skin feeling tight or sticky after towel drying, and achieves both dense foam and excellent foam-breaking properties, and also rinses off quickly, it can be used, for example, in body shampoos, body soaps, facial cleansing foams, hand soaps, foaming hand soaps, cleansing foams, and makeup removers. In particular, it can be suitably used in body soaps that are lathered using cleansing tools such as nylon towels or cotton towels, or in body soaps that are filled in foaming containers and dispensed as foam. [Examples]

[0120] 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 content of component (D) to the content of component (A) [(D) / (A)] is rounded to the third decimal place by rounding to the fourth decimal place.

[0121] (Examples 1-24 and Comparative Examples 1-10) Liquid skin cleansing compositions with the compositions and contents shown in Tables 1 to 4, 6, and 7 below were prepared according to the following methods.

[0122] Solution I was prepared by preheating and dissolving at least one of the hydroxyalkylated cyclodextrin and highly branched cyclic dextrin of component (D), or cyclodextrin as a comparative component of component (D) and purified water.

[0123] Solution II was prepared by dissolving the amino acid-based surfactant of component (A) or an anionic surfactant as a comparative component of component (A) in purified water.

[0124] Next, solution III was prepared by adding solution I, which contains 40 mol% or more of structural units derived from dimethyldiallylammonium chloride (component B) or less than 40 mol% of structural units derived from dimethyldiallylammonium chloride as a comparative component of component B, a cationized polysaccharide (component C) or a methacryloylethyldimethylbetaine-methacryloylethyltrimethylammonium chloride-2-hydroxyethyl methacrylate copolymer as a comparative component of component C, and component D or a comparative component of component D, to solution II.

[0125] The total amount of purified water used in the aforementioned dissolving solution I and dissolving solution II was such that the mass of dissolving solution III was 95% by mass of the mass of the liquid skin cleansing agent composition that would ultimately be obtained.

[0126] Subsequently, the common components propylene glycol, phenoxyethanol, monoethanolamine, and fragrance were added. If the pH was below the predetermined pH (pH 9.4), citric acid, another common component, was added to adjust the pH to 9.4. Then, purified water was added to bring the total volume to 100% by mass, thereby obtaining the liquid skin cleansing compositions of Examples 1-24 and Comparative Examples 1-10.

[0127] When preparing each of the liquid skin cleansing compositions, 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).

[0128] (Examples 25-28) Liquid skin cleansing compositions with the composition and content shown in Table 5 below were prepared according to the following method. In the preparation methods for each liquid skin cleansing composition of Examples 1 to 24 and Comparative Examples 1 to 10, the liquid skin cleansing compositions of Examples 25 to 28 were obtained by the same method as in the preparation methods for each liquid skin cleansing composition of Examples 1 to 24 and Comparative Examples 1 to 10, except that when preparing the solvent III, one or more amphoteric surfactants selected from aminopropionic acid-based amphoteric surfactants and betaine-based amphoteric surfactants of component (E) were added.

[0129] <Rating> The liquid skin cleansing compositions obtained in Examples 1-28 and Comparative Examples 1-10 were filled into containers with foam pump dispensers [discharge volume 3 mL, manufactured by Yoshino Kogyosho Co., Ltd.] and used for the following evaluations.

[0130] For each liquid skin cleansing composition of Examples 1-28 and Comparative Examples 1-10, the following were evaluated and determined regarding "skin irritation," "foam density," "skin moisture after towel drying," "skin stickiness after towel drying," "skin tightness after towel drying," "foaming ability," and "rinsing speed." The results are shown in Tables 1-7 below.

[0131] <<Skin irritation>> Ten expert evaluators each dispensed two pumps (approximately 6g) of each liquid skin cleansing composition from Examples 1-28 and Comparative Examples 1-10 into their palms, 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 "skin irritation" based on the evaluation criteria below. The results were determined by calculating the average score of the ten evaluators and judging based on the evaluation criteria for the average score below. - Criteria for evaluating "skin irritation" - 4 points: No skin irritation felt. 3 points: Slightly irritating to the skin. 2 points: Skin irritation felt 1 point: I feel a strong skin irritation. - Criteria for determining "skin irritation" - ◎: 3.5 points or more and 4.0 points or less ○: 3.0 points or higher, less than 3.5 points △: 2.0 points or more, less than 3.0 points

[0132] <<Denseness of the foam>> Ten expert evaluators took two pumps (approximately 6g) of each liquid skin cleansing composition from Examples 1-28 and Comparative Examples 1-10 into their palms, washed their entire bodies, and then took the foam back into their palms. They observed the feel of the foam bouncing back when pressed between their hands and how easily it dripped when their hands were turned upside down, and evaluated the "density of the foam" based on the evaluation criteria below. The results were determined by calculating the average score of the ten evaluators and judging based on the evaluation criteria for the average score below. -Evaluation criteria for "bubble density"- 4 points: The foam is firm and doesn't drip even when you turn your hand upside down. 3 points: The foam is slightly firm and doesn't drip even when you turn your hand upside down. Points 2: The foam is a little soft and tends to drip slightly when you turn your hand upside down. 1 point: The foam is soft and drips when you turn your hand upside down. - Criteria for judging "foam density" - ◎◎: 3.5 points or more and 4.0 points or less ◎: 3.0 points or higher, less than 3.5 points ○: 2.5 points or more, less than 3.0 points △: 2.0 points or higher, less than 2.5 points ×: Less than 2.0 points

[0133] <<The moist feeling of skin after towel-drying>> Ten expert evaluators each dispensed two pumps (approximately 6g) of each liquid skin cleansing composition from Examples 1-28 and Comparative Examples 1-10 into their palms, 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 "moisture level of 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 evaluation criteria for the average score below. -Evaluation criteria for "skin's moisturizing effect after towel-drying"- 4 points: I feel a strong moisturizing effect. 3 points: Feels moisturizing. 2 points: Slightly moisturizing. 1 point: Does not feel moisturizing. - Criteria for judging "skin's moisture level after towel-drying" - ◎: 3.5 points or more and 4.0 points or less ○: 3.0 points or higher, less than 3.5 points △: 2.0 points or more, less than 3.0 points ×: Less than 2.0 points

[0134] <<Skin feels sticky after towel-drying>> Ten expert evaluators each dispensed two pumps (approximately 6g) of the liquid skin cleansing compositions from Examples 1-28 and Comparative Examples 1-10 into their palms, 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 "stickiness of 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 evaluation criteria for the average score below. -Evaluation criteria for "stickiness of the skin after towel drying"- 4 points: No sticky feeling. 3 points: Slightly sticky feeling. 2 points: I feel a sticky sensation. 1 point: I feel a strong sticky sensation. - Criteria for determining "stickiness of the skin after towel drying" - ◎: 3.5 points or more and 4.0 points or less ○: 3.0 points or higher, less than 3.5 points △: 2.0 points or more, less than 3.0 points ×: Less than 2.0 points

[0135] <<Skin tightness after towel-drying>> Ten expert evaluators each dispensed two pumps (approximately 6g) of each liquid skin cleansing composition from Examples 1-28 and Comparative Examples 1-10 into their palms, 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 "tightness of 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 evaluation criteria for the average score below. -Evaluation criteria for "skin tightness after towel drying"- 4 points: No feeling of tightness. 3 points: I feel a slight tightness. 2 points: I feel a tightness. 1 point: I feel a strong sense of tightness. - Criteria for determining "tightness of the skin after towel-drying" - ◎: 3.5 points or more and 4.0 points or less ○: 3.0 points or higher, less than 3.5 points △: 2.0 points or more, less than 3.0 points ×: Less than 2.0 points

[0136] <<Bubbling property>> A specialist evaluator took two pumps (approximately 6g) of each liquid skin cleansing composition from Examples 1-28 and Comparative Examples 1-10 into their palm and spread it over the entire surface of a black board (40cm x 30cm). Then, from a distance of 20cm from the applied area of ​​the liquid skin cleansing composition, a spray bottle (Z-305 Compact Trigger Pump, manufactured by Mitani Valve Co., Ltd.) was used to spray water over the entire applied area in multiple sprays while changing the position. After 15 seconds had elapsed since spraying, the black board was photographed with a digital camera (magnification 1x). The captured image was processed to show the entire surface of the black board, and then binarized using image analysis software (WinRoof, manufactured by Mitani Corporation). The ratio of the area where the black board was not visible to the total area of ​​the black board was determined, and the "foaming ability" was evaluated based on the evaluation criteria below. This evaluation was repeated 10 times. The results were determined by calculating the average score of the 10 evaluations and judging based on the evaluation criteria for the average score below. - Evaluation criteria for "bubble-breaking properties" - 4 points: The percentage of the area where the black board is not visible relative to the total area of ​​the black board is less than 60%. 3. The percentage of the area where the black board is not visible relative to the total area of ​​the black board is between 60% and 70%. 2. The percentage of the area where the black board is not visible relative to the total area of ​​the black board is between 70% and 80%. 1 point: The percentage of the area where the black board is not visible relative to the total area of ​​the black board is 80% or more. - Criteria for determining "buoyancy" - ◎: 3.5 points or more and 4.0 points or less ○: 3.0 points or higher, less than 3.5 points △: 2.0 points or more, less than 3.0 points ×: Less than 2.0 points

[0137] <<Rinsing speed>> Ten expert evaluators took two pumps (approximately 6g) of each liquid skin cleansing composition from Examples 1-28 and Comparative Examples 1-10 into their palms, washed their entire bodies with it, and rinsed with 40°C warm water. They measured the time from the start to the end of rinsing with a stopwatch and evaluated the "speed of rinsing" based on the evaluation criteria below. The results were calculated by averaging the scores of the ten evaluators and then judging based on the evaluation criteria for the average score below. -Evaluation criteria for "rinsing speed"- 4 points: Rinsing is completed in 10 seconds or less. 3 points: Rinsing is completed in between 10 and 12 seconds. 2 points: Rinsing is completed in between 12 and 15 seconds. 1 point: Rinsing takes more than 15 seconds. - Criteria for judging "rinsing speed" - ◎: 3.5 points or more and 4.0 points or less ○: 3.0 points or higher, less than 3.5 points △: 2.0 points or more, less than 3.0 points ×: Less than 2.0 points

[0138] [Table 1]

[0139] [Table 2]

[0140] [Table 3]

[0141] [Table 4]

[0142] [Table 5]

[0143] [Table 6]

[0144] [Table 7]

[0145] (Prescription examples 1-6) In the preparation methods for each liquid skin cleansing composition of Examples 1 to 28 and Comparative Examples 1 to 10, the liquid skin cleansing compositions of Formulation Examples 1 to 6 were obtained by the same method as the preparation methods for each liquid skin cleansing composition of Examples 1 to 28 and Comparative Examples 1 to 10, except that the composition and content of components (A), (B), (C), (D), (E), and the common component were changed to the composition and content shown in Table 8 below.

[0146] [Table 8]

[0147] Details of each component used in Examples 1-28, Comparative Examples 1-10, and Formulation Examples 1-6 are shown in Table 9 below.

[0148] [Table 9]

[0149] *1: For component (A), the comparative component potassium laurate was prepared by neutralizing lauric acid (NAA-122, manufactured by NOF Corporation) with potassium hydroxide (manufactured by Asahi Glass Co., Ltd., liquid caustic potash). *2: The comparative component of component (B), acrylamide / dimethyldiallylammonium chloride / acrylic acid copolymer (Marcoat 3330PR, manufactured by Nippon Lubrizol Co., Ltd.), is a polymer compound having the structure represented by the following general formula (1), where n is 34, m is 31, and z is 35. [ka] However, in the general formula (1) above, n, m, and z represent the molar ratio (mol%) of each structural unit, and n + m + z = 100.

Claims

1. (A) Amino acid-based surfactants, (B) A cationic polymer containing 40 mol% or more of structural units derived from dimethyldiallylammonium chloride, (C) Cationized polysaccharides and (D) A dextrin which is at least one of hydroxyalkylated cyclodextrin and a highly branched cyclic dextrin, It contains, A liquid skin cleansing composition characterized in that the content of component (D) is 0.01% by mass to 0.09% by mass.

2. The liquid skin cleansing composition according to claim 1, wherein the mass ratio [(D) / (A)] of the content of at least one of the dextrins (D) hydroxyalkylated cyclodextrin and highly branched cyclic dextrin to the content of the amino acid-based surfactant (A) is 0.005 to 0.

15.

3. (E) The liquid skin cleansing composition according to claim 1 or 2, further comprising at least one amphoteric surfactant selected from aminopropionic acid-based amphoteric surfactants and betaine-based amphoteric surfactants.

4. The liquid skin cleansing composition according to claim 1 or 2, wherein the content of component (A) is 1% to 10% by mass, the content of component (B) is 0.1% to 0.8% by mass, the content of component (C) is 0.1% to 0.8% by mass, and the content of component (D) is 0.05% to 0.09% by mass.

5. The liquid skin cleansing composition according to claim 3, wherein the content of component (E) is 3% by mass to 15% by mass.

6. A liquid skin cleansing composition according to claim 1 or 2, which is filled into a foaming container.

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