Liquid skin cleanser composition

Abstract

To provide a liquid skin cleansing composition that does not cause skin irritation, gives dense foam, and renders the skin moist after towel dry, but does not render the skin tight after the towel dry.SOLUTION: A liquid skin cleansing composition comprises (A) an amino acid-based surfactant, (B) a cationic polymer that comprises dimethyldiallylammonium chloride as a monomer unit, the molar ratio of the dimethyldiallylammonium chloride being 40 mol% or more, and (C) cationized polysaccharides, wherein the mass ratio of the content of the component (B) to the content of the component (C) [(B) / (C)] is 1.0-4.0.SELECTED DRAWING: None

Description

[Technical Field]

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

[0002] Conventionally, higher fatty acid salts have often been used as the main cleansing ingredient in liquid skin cleanser compositions such as hand soaps and body soaps from the viewpoint of foam density and cleansing power (see, for example, Patent Document 1). However, liquid skin cleanser compositions using higher fatty acid salts have had problems such as skin irritation and a tight feeling after towel drying.

[0003] In recent years, the number of consumers concerned about sensitive skin has increased, leading to a growing demand for products that are non-irritating, leave skin feeling moisturized after towel drying, and do not leave skin feeling tight after towel drying. In response to this demand, mild skin cleansing compositions using amino acid surfactants as the main cleansing ingredient have been proposed. For example, a composition containing an N-acylamino acid salt, a solid oil, and a cationized polysaccharide (see Patent Document 2), a composition containing an amino acid surfactant, a cationic polymer, and an amidosulfobetaine-type amphoteric surfactant (see Patent Document 3), a composition containing an N-acylamino acid salt, a cationized cellulose, and a dialkyldiallyl quaternary ammonium salt-acrylamide copolymer (see Patent Document 4), and a composition containing an N-acylamino acid salt, an aminopropionic acid-based amphoteric surfactant, a betaine-based amphoteric surfactant, and a sugar compound (see Patent Document 5) have been proposed. However, even with these compositions, the moisturizing feeling of the skin after towel drying remains unsatisfactory.

[0004] Furthermore, a composition containing an N-acylamino acid salt, various surfactants, a cationic polymer, and a water-soluble polymer has also been proposed (see Patent Document 6) as a composition that has good foaming power, foam elasticity, foam stability, and foam texture without incorporating a fatty acid soap. However, the foam produced by this composition is less dense than skin cleansing compositions that use higher fatty acid salts.

[0005] Therefore, there is a need for a liquid skin cleanser composition that is non-irritating to the skin, produces dense foam, and satisfies both the moist feeling of the skin after towel drying and the tight feeling of the skin after towel drying. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2021-91641 [Patent Document 2] Japanese Patent Application Laid-Open No. 2013-163658 [Patent Document 3] Japanese Patent Application Publication No. 2020-117469 [Patent Document 4] Japanese Patent Application Laid-Open No. 2005-306843 [Patent Document 5] Japanese Patent Application Laid-Open No. 2011-148772 [Patent Document 6] Japanese Patent Application Publication No. 2019-1724 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention aims to solve the above-mentioned problems of the prior art and to achieve the following object: That is, the present invention aims to provide a liquid skin cleanser composition that is non-irritating to the skin, produces dense foam, and leaves the skin feeling moisturized and free of tightness after towel drying. [Means for solving the problem]

[0008] As a result of intensive research into achieving the above-mentioned object, the present inventors have found that a liquid skin cleanser composition comprising (A) an amino acid-derived surfactant, (B) a cationic polymer containing dimethyldiallylammonium chloride as a monomer unit, in which the molar ratio of the dimethyldiallylammonium chloride is 40 mol % or more, and (C) a cationized polysaccharide, and in which the mass ratio of the content of the component (B) to the content of the component (C) [(B) / (C)] is 1.0 to 4.0, is non-skin irritating, produces dense foam, and leaves the skin feeling moisturized and free of tightness after towel drying.

[0009] The present invention is based on the above findings by the present inventors, and the means for solving the above problems are as follows: <1> (A) an amino acid-based surfactant; (B) a cationic polymer containing dimethyldiallylammonium chloride as a monomer unit, in which the molar ratio of the dimethyldiallylammonium chloride is 40 mol % or more; (C) a cationized polysaccharide; Contains The liquid skin cleansing composition is characterized in that the mass ratio of the content of the component (B) to the content of the component (C) [(B) / (C)] is 1.0 to 4.0. <2> The composition further contains (D) at least one amphoteric surfactant selected from the group consisting of aminopropionic acid-based amphoteric surfactants and betaine-based amphoteric surfactants. <1> The liquid skin cleanser composition according to claim 1. <3> Furthermore, (E) the above-mentioned composition containing an anti-inflammatory component <1> from <2> The liquid skin cleanser composition according to any one of the preceding claims. <4> the mass ratio [(A) / (B+C)] of the content of the component (A) to the sum of the content of the component (B) and the content of the component (C) is 4.0 to 20.0; <1> from <3> The liquid skin cleanser composition according to any one of the preceding claims. <5> The content of the (A) component is 1% by mass to 10% by mass, the content of the (B) component is 0.1% by mass to 0.8% by mass, and the content of the (C) component is 0.1% by mass to 0.8% by mass. <1> from <4> The liquid skin cleanser composition according to any one of the preceding claims. <6> The content of the component (D) is 3% by mass to 15% by mass. <2> from <5> The liquid skin cleanser composition according to any one of the preceding claims. <7> The above-mentioned composition is filled in a former container. <1> from <6> The liquid skin cleanser composition according to any one of the preceding claims. [Effects of the Invention]

[0010] The present invention can solve the above-mentioned conventional problems and achieve the above-mentioned object, and can provide a liquid skin cleanser composition that is non-irritating to the skin, produces dense foam, and leaves the skin feeling moisturized and free from tightness after towel drying. DETAILED DESCRIPTION OF THE INVENTION

[0011] (Liquid skin cleanser composition) The liquid skin cleanser composition of the present invention contains (A) an amino acid-based surfactant, (B) a cationic polymer containing dimethyldiallylammonium chloride as a monomer unit in which the molar ratio of the dimethyldiallylammonium chloride is 40 mol % or more, and (C) a cationized polysaccharide, and preferably further contains (D) at least one amphoteric surfactant selected from aminopropionic acid-based amphoteric surfactants and betaine-based amphoteric surfactants, and (E) an anti-inflammatory component, and may further contain other components as necessary. The mass ratio of the content of the component (B) to the content of the component (C) in the liquid skin cleanser composition [(B) / (C)] is 1.0 to 4.0.

[0012] <(A) Amino acid surfactant> The amino acid-derived surfactant as component (A) is blended mainly to improve the lack of skin irritation, the denseness of the foam, and the moist feeling of the skin after towel drying. In this specification, "thick foam" means that the foam feels firm when it bounces back when pressed together with both hands, and that the foam attached to the hands does not drip even when the hands are turned upside down.

[0013] The amino acid surfactant of component (A) is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include compounds represented by the following general formula (A1): The amino acid surfactants may be used alone or in combination of two or more. [ka]

[0014] In the general formula (A1), R 1 is a hydrophobic group, and represents a saturated or unsaturated, straight-chain or branched-chain hydrocarbon group having 5 to 23 carbon atoms, and is preferably a straight-chain or branched-chain alkyl or alkenyl group having 5 to 23 carbon atoms, or a phenyl group substituted with a straight-chain or branched-chain alkyl or alkenyl group having 5 to 23 carbon atoms. 1 The number of carbon atoms is preferably 8 to 18 in terms of non-irritation to the skin, dense foam, and moist feeling of the skin after towel drying.

[0015] In the general formula (A1), R 2 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.

[0016] In the general formula (A1), R 3 and R 4 may be the same or different and are a hydrogen atom or -(CH2) m -COOM 2 Shows.

[0017] In the general formula (A1), m and n may be the same or different and represent a number of 0 to 20.

[0018] In the general formula (A1), M 1 and M 2 may be the same or different and represent a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium, or a basic amino acid.

[0019] The amino acid structure of the hydrophilic portion of the amino acid-based surfactant of component (A) is not particularly limited and can be selected appropriately depending on the purpose. However, from the viewpoints of non-irritation to the skin, dense foam, and moist feeling of the skin after towel drying, it is preferable that the hydrophilic group is at least one selected from glycine, glutamic acid, methylalanine, aspartic acid, and methyltaurine.

[0020] The amino acid surfactant of component (A) is more preferably an N-acylamino acid salt having a fatty acid of 8 to 18 carbon atoms in the hydrophobic group, and even more preferably an N-acylglycine salt having a fatty acid of 8 to 18 carbon atoms in the hydrophobic group.

[0021] Specific examples of the amino acid surfactant of component (A) include N-cocoyl glycine salt (N-coconut oil fatty acid acyl glycine salt), N-lauroyl glutamate, N-myristoyl glutamate, N-cocoyl glutamate (N-coconut oil fatty acid acyl glutamate), N-lauroyl-N-methyl-β-alanine salt, N-myristyl-N-methyl-β-alanine salt, N-cocoyl-N-methyl-β-alanine salt (N-coconut oil fatty acid-N-methyl-β-alanine salt), N-lauroyl aspartate, N-cocoyl methyl taurine salt, etc. These may be used alone or in combination of two or more.

[0022] The counter ion of the N-acylglycine salt is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include alkali metal salts and amine salts. The alkali metal salt is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include sodium salts and potassium salts. The amine salt is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include ammonium salts; monoethanolamine salts, diethanolamine salts, triethanolamine salts, and alkanolamine salts such as 2-amino-2-methylpropanol and 2-amino-2-methylpropanediol. Among these, alkali metal salts are preferred, and potassium salts are particularly preferred.

[0023] Specific examples of the amino acid surfactant of component (A) include potassium cocoyl glycinate, sodium cocoyl glycinate, and triethanolamine cocoyl glycinate.

[0024] The amino acid surfactant of the component (A) may be suitably synthesized or may be a commercially available product. Commercially available amino acid surfactants of component (A) include, for example, trade names such as Alanon (registered trademark) ALE (N-lauroyl-N-methyl-β-alanine sodium), Alanon (registered trademark) AME (N-myristyl-N-methyl-β-alanine sodium), and Alanon (registered trademark) ACE (N-cocoyl-N-methyl-β-alanine sodium) (all manufactured by Kawaken Fine Chemicals Co., Ltd.), Aminosurfact (registered trademark) ALMS-P1 (N-lauroyl glutamate sodium), Aminosurfact (registered trademark) AMMS-P1 (N-myristoyl glutamate sodium), and Aminosurfact (registered trademark) ACDS-L (N-cocoyl glutamate sodium) (all manufactured by Asahi Kasei Finechem Co., Ltd.), and Amirite (registered trademark). Examples include GCK-12K (potassium N-cocoylglycine, manufactured by Ajinomoto Healthy Supply Co., Ltd.), Aminoformer (registered trademark) FLDS-L (sodium N-lauroyl aspartate, manufactured by Asahi Kasei Finechem Co., Ltd.), and Diapon (registered trademark) K-SF (sodium N-cocoyl methyl taurate, manufactured by NOF Corporation).

[0025] The content of the amino acid surfactant in component (A) is not particularly limited and can be selected appropriately depending on the purpose. For example, the lower limit, relative to the total amount of the liquid skin cleanser composition, can be 0.5% by mass or more or 1% by mass or more, and the upper limit can be 15% by mass or less or 10% by mass or less. The lower and upper limits of the content of the amino acid surfactant in component (A) can be appropriately combined. From the viewpoints of foam density, moist feeling of skin after towel drying, and non-irritation to skin, the content is preferably 0.5% by mass to 15% by mass, and more preferably 1% by mass to 10% by mass, relative to the total amount of the liquid skin cleanser composition. When the content of the amino acid surfactant in component (A) is 0.5% by mass or more, foam density and moist feeling of skin after towel drying are good, and when it is 15% by mass or less, non-irritation to skin is good.

[0026] <(B) Cationic Polymer> The cationic polymer as the component (B) contains dimethyldiallylammonium chloride as a monomer unit, and the molar ratio of the dimethyldiallylammonium chloride is 40 mol % or more. The cationic polymer as component (B) is contained mainly to improve the moist feeling of the skin after towel drying.

[0027] The cationic polymer of component (B) is not particularly limited and can be appropriately selected depending on the purpose as long as it contains dimethyldiallylammonium chloride as a monomer unit and the molar ratio of dimethyldiallylammonium chloride is 40 mol% or more, and examples thereof include dimethyldiallylammonium chloride polymer, dimethyldiallylammonium chloride-acrylic acid copolymer, etc. These may be used alone or in combination of two or more.

[0028] The dimethyldiallylammonium chloride-acrylic acid copolymer serving as the cationic polymer of the component (B) is a polymer compound having a structure represented by the following general formula (B1). [ka] In the general formula (B1), n ​​and m represent the molar ratio (mol %) of each structural unit, n+m=100, and m is 40 mol % or more.

[0029] The molar ratio of structural units derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer of component (B) is not particularly limited as long as it is 40 mol %, and can be selected appropriately depending on the purpose. However, from the viewpoint of moist feeling of the skin after towel drying, 65 mol % or more is preferable, and 96 mol % or more is more preferable. The dimethyldiallylammonium chloride-acrylic acid copolymer may be used alone or in combination of two or more kinds.

[0030] The molar ratio of structural units in the dimethyldiallylammonium chloride-acrylic acid copolymer of the component (B) can be determined by measuring by nuclear magnetic resonance (NMR) under the following measurement conditions. [Measurement conditions] Solvent: Deuterium oxide (DO) Measuring instrument: JNM-LA300 (300MHz, manufactured by JEOL Ltd.)

[0031] 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 from the viewpoint of moist feeling of the skin after towel drying, it is preferably 10,000 to 1,000,000, more preferably 15,000 to 450,000. The weight average molecular weight of the cationic polymer of component (B) can be measured, for example, using a SEC-MALLS-RI system (measurement conditions: column: TSKgel α series α-M column 30 cm manufactured by Tosoh Corporation, solvent: 0.3 M aqueous sodium nitrate solution).

[0032] The viscosity at 25° C. of a solution of the cationic polymer of the component (B) having a solids content of 30% by mass to 44% by mass 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).

[0033] The cationic polymer of component (B) may be either an appropriately synthesized product or a commercially available product, such as the following commercial products:

[0034] MERQUAT 100 (component name: dimethyldiallylammonium chloride polymer, manufactured by Lubrizol Japan, solids content 39% to 44% by mass, viscosity at 25°C: 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) at 25° C. with a spindle No. 3 rotor at 6 revolutions per minute.

[0035] Marcote 106 (component name: dimethyldiallylammonium chloride polymer, manufactured by Lubrizol Japan, solid content 30% to 36% by mass, viscosity at 25°C: 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) at 25° C. with a rotor of spindle No. 1 at 60 rpm.

[0036] Merquat 280 (component name: dimethyldiallylammonium chloride-acrylic acid copolymer, manufactured by Lubrizol Japan Corporation, solid content 39% by mass 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 general formula (B1), molar ratio of structural units derived from dimethyldiallylammonium chloride 65% by mole). The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25° C. with a spindle No. 4 rotor at 60 rpm.

[0037] Merquat 295 (component name: dimethyldiallylammonium chloride-acrylic acid copolymer, manufactured by Lubrizol Japan Corporation, solid content 35% by mass to 40% by mass, viscosity at 25°C: 3,500 mPa s to 9,000 mPa s, weight-average molecular weight 190,000, n:m = 5:95 (molar ratio) in general formula (B1), molar ratio of structural units derived from dimethyldiallylammonium chloride 95% by mole). The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25° C. with a rotor of spindle No. 4 at 30 revolutions per minute.

[0038] Among these, Marquart 100, Marquart 280, and Marquart 295 are preferred as the cationic polymer of component (B) from the viewpoint of moist feeling on the skin after towel drying.

[0039] The content of the cationic polymer in component (B) is not particularly limited and can be selected appropriately depending on the purpose. For example, the lower limit, relative to the total amount of the liquid skin cleanser composition, can be 0.1% by mass or more, and the upper limit, relative to the total amount of the liquid skin cleanser composition, can be 1% by mass or less, or 0.8% by mass or less. The lower and upper limits of the content of the cationic polymer in component (B) can be appropriately combined. From the viewpoints of moist feeling of skin after towel drying and non-tight feeling of skin after towel drying, the content is preferably 0.1% by mass to 1% by mass, and more preferably 0.1% by mass to 0.8% by mass, relative to the total amount of the liquid skin cleanser composition. When the content of the cationic polymer in component (B) is 0.1% by mass or more, the moist feeling of skin after towel drying is good, and when it is 1% by mass or less, the non-tight feeling of skin after towel drying is good.

[0040] <(C) Cationized Polysaccharides> The cationized polysaccharide as component (C) is blended mainly to improve the density of the foam and to prevent the skin from feeling tight after towel drying.

[0041] The cationized polysaccharide of component (C) is not particularly limited and 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 alone or in combination of two or more. Among these, cationized cellulose (O-[2-hydroxy-3-(trimethylammonio)propyl]hydroxyethyl cellulose chloride) is preferred from the viewpoints of foam density and the lack of tightness on the skin after towel drying.

[0042] The cationized polysaccharide of the component (C) may be suitably synthesized or may be a commercially available product. Examples of commercially available cationized polysaccharides of component (C) include, by trade name, Catinal HC-100 (cationized cellulose), Catinal CLB-100 (cationized locust bean gum) (both manufactured by Toho Chemical Industry Co., Ltd.), Labolgum CG-M (cationized guar gum, manufactured by DSP Gokyo Food & Chemical Co., Ltd.), and Labolgum CX (cationized xanthan gum, manufactured by DSP Gokyo Food & Chemical Co., Ltd.).

[0043] The content of the cationized polysaccharide in component (C) is not particularly limited and can be appropriately selected depending on the purpose. For example, the lower limit can be 0.1% by mass or more, and the upper limit can be 1% by mass or less or 0.8% by mass or less, relative to the total amount of the liquid skin cleanser composition. The lower and upper limits of the content of the cationized polysaccharide in component (C) can be appropriately combined. From the viewpoints of foam density, moist feeling of skin after towel drying, and non-tight feeling of skin after towel drying, the content is preferably 0.1% by mass to 1% by mass, and more preferably 0.1% by mass to 0.8% by mass, relative to the total amount of the liquid skin cleanser composition. When the content of the cationized polysaccharide in component (C) is 0.1% by mass or more, foam density and non-tight feeling of skin after towel drying are good, and when it is 1% by mass or less, the moist feeling of skin after towel drying is good.

[0044] <<Mass ratio [(B) / (C)]>> The mass ratio [(B) / (C)] of the content (% by mass) of the component (B) to the content (% by mass) of the component (C) is 1.0 to 4.0, but is preferably 1.3 to 3 from the viewpoints of moist feeling after towel drying, lack of skin tightness after towel drying, dense foam, and skin retention of the anti-inflammatory component. If the mass ratio [(B) / (C)] is less than 1.0, the skin moist feeling after towel drying will be insufficient, and if the liquid skin cleanser composition contains the anti-inflammatory component (E), the skin retention of the anti-inflammatory component will be insufficient. If the mass ratio [(B) / (C)] is more than 4.0, the skin tight feeling after towel drying and dense foam will be insufficient, and if the liquid skin cleanser composition contains the anti-inflammatory component (E), the skin retention of the anti-inflammatory component will be insufficient. On the other hand, when the mass ratio [(B) / (C)] is 1.0 to 4.0, the skin feels moist after towel drying, the skin does not feel tight after towel drying, the foam is dense, and the anti-inflammatory ingredient remains well on the skin.

[0045] <<Mass ratio [(A) / (B+C)]>> The mass ratio [(A) / (B+C)] of the content (% by mass) of the component (A) to the sum of the content (% by mass) of the component (B) and the content (% by mass) of the component (C) is not particularly limited and can be appropriately selected depending on the purpose. Examples of the lower limit include 2.5 or more and 4.0 or more, and the upper limit includes 26.7 or less and 20.0 or less. The lower and upper limits of the mass ratio [(A) / (B+C)] can be appropriately combined. From the viewpoint of the skin retention of the anti-inflammatory component, a range of 2.5 to 26.7 is preferred, and 4.0 to 20.0 is more preferred. When the liquid skin cleanser composition contains the anti-inflammatory component (E), a mass ratio [(A) / (B+C)] of 2.5 or more or 26.7 or less ensures good skin retention of the anti-inflammatory component.

[0046] <(D) Amphoteric surfactant> The liquid skin cleanser composition preferably further contains an amphoteric surfactant as the component (D), in that the density of the foam can be further improved. The amphoteric surfactant as the component (D) is at least one selected from aminopropionic acid-based amphoteric surfactants and betaine-based amphoteric surfactants.

[0047] <<Aminopropionic acid-based amphoteric surfactants>> The aminopropionic acid-based amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include β-laurylaminopropionate, laurylaminodipropionate, N-coconut oil fatty acid acyl-N'-carboxyethyl-N'-hydroxyethylethylenediamine salt, etc. These may be used alone or in combination of two or more.

[0048] The counter ion of the aminopropionic acid-based amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include alkali metal salts and amine salts. The alkali metal salt is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include sodium salts and potassium salts. The amine salt is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include ammonium salts; monoethanolamine salts, diethanolamine salts, triethanolamine salts, and alkanolamine salts such as 2-amino-2-methylpropanol and 2-amino-2-methylpropanediol. Of these, alkali metal salts are preferred, with sodium salts being particularly preferred.

[0049] Specific examples of the aminopropionic acid-based amphoteric surfactant include sodium β-laurylaminopropionate, sodium laurylaminodipropionate, and coconut oil fatty acid acyl-N-carboxyethyl-N-hydroxyethylethylenediamine sodium.

[0050] The aminopropionic acid-based amphoteric surfactant may be suitably synthesized or may be a commercially available product. Examples of commercially available aminopropionic acid-based amphoteric surfactants include, by trade name, Levon APL (sodium β-laurylaminopropionate, manufactured by Sanyo Chemical Industries, Ltd.), Taipol Soft LDP-30 (sodium laurylaminodipropionate, manufactured by Taiko Yushi Kagaku Kogyo Co., Ltd.), and Softazoline (registered trademark) NS (N-coconut oil fatty acid acyl-N'-carboxyethyl-N'-hydroxyethylethylenediamine sodium, manufactured by Kawaken Fine Chemicals Co., Ltd.).

[0051] <<Betaine-based amphoteric surfactants>> The betaine-based amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include imidazoline-based amphoteric surfactants, carbobetaine-based amphoteric surfactants, sulfobetaine-based amphoteric surfactants, etc. These may be used alone or in combination of two or more.

[0052] -Imidazoline-type amphoteric surfactant- The imidazoline-type amphoteric surfactants include amidoamine-type amphoteric surfactants. Examples of the imidazoline-type amphoteric surfactant include 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine.

[0053] The imidazoline-type amphoteric surfactant may be suitably synthesized or may be a commercially available product. Examples of commercially available imidazoline-type amphoteric surfactants include Softazoline (registered trademark) CH (2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine, manufactured by Kawaken Fine Chemicals Co., Ltd.).

[0054] -Carbobetaine-type amphoteric surfactant- The carbobetaine type amphoteric surfactants include alkylbetaine type amphoteric surfactants, alkylamidobetaine alkylbetaine type amphoteric surfactants, and the like. Examples of the alkyl betaine type amphoteric surfactant include alkyl betaines such as lauryl dimethyl amino acetic acid betaine and stearyl dimethyl amino acetic acid betaine. Examples of the alkylamidobetaine alkylbetaine type amphoteric surfactant include coconut oil fatty acid amidopropyl betaine and lauric acid amidopropyl betaine.

[0055] The carbobetaine-type amphoteric surfactant may be suitably synthesized or may be a commercially available product. Commercially available alkylbetaine amphoteric surfactants include, for example, trade names such as Amphitol 24B (lauryldimethylaminoacetic acid betaine) and Amphitol 86B (stearyldimethylaminoacetic acid betaine) (both manufactured by Kao Corporation). Commercially available alkylamidobetaine alkylbetaine amphoteric surfactants include, for example, Softazoline (registered trademark) CPB-R (coconut oil fatty acid amidopropyl betaine, manufactured by Kawaken Fine Chemicals Co., Ltd.) and Amphitol 20AB (lauric acid amidopropyl betaine, manufactured by Kao Corporation).

[0056] -Sulfobetaine-type amphoteric surfactant- The sulfobetaine type amphoteric surfactants include alkyl sulfobetaine alkyl betaine type amphoteric surfactants, alkyl hydroxy sulfobetaine alkyl betaine type amphoteric surfactants, and the like. Examples of the alkyl sulfobetaine alkyl betaine type amphoteric surfactants include coconut oil fatty acid dimethyl sulfopropyl betaine (lauramidopropyl hydroxysultaine). Examples of the alkylhydroxysulfobetaine alkylbetaine type amphoteric surfactants include laurylhydroxysulfobetaine.

[0057] The sulfobetaine-type amphoteric surfactant may be suitably synthesized or may be a commercially available product. Commercially available alkyl sulfobetaine alkyl betaine type amphoteric surfactants include, for example, Softazoline (registered trademark) LSB (coconut oil fatty acid dimethyl sulfopropyl betaine, manufactured by Kawaken Fine Chemicals Co., Ltd.). Commercially available alkylhydroxysulfobetaine alkylbetaine type amphoteric surfactants include, for example, Amphitol 20HD (laurylhydroxysulfobetaine liquid, manufactured by Kao Corporation).

[0058] Among these, as the amphoteric surfactant of component (D), β-laurylaminopropionate, laurylaminodipropionate, lauric acid amidopropyl betaine (lauramidopropyl betaine), and coconut oil fatty acid amidopropyl betaine (cocamidopropyl betaine) are preferred from the viewpoint of foam density, and sodium β-laurylaminopropionate and lauric acid amidopropyl betaine (lauramidopropyl betaine) are more preferred.

[0059] The content of the amphoteric surfactant of component (D) is not particularly limited and can be selected appropriately depending on the purpose. For example, the lower limit, relative to the total amount of the liquid skin cleanser composition, can be 1% by mass or more or 3% by mass or more, and the upper limit can be 20% by mass or less or 15% by mass or less. The lower and upper limits of the content of the amphoteric surfactant of component (D) can be appropriately combined. From the viewpoints of foam density and moist feeling of skin after towel drying, the content is preferably 1% by mass to 20% by mass, and more preferably 3% by mass to 15% by mass, relative to the total amount of the liquid skin cleanser composition. When the content of the amphoteric surfactant of component (D) is 1% by mass or more, foam density is good, and when it is 20% by mass or less, moist feeling of skin after towel drying is good.

[0060] <(E) Anti-inflammatory component> The liquid skin cleanser composition preferably further contains an anti-inflammatory component as the component (E) in that it can impart an effect of improving rough skin. The liquid skin cleanser composition contains the components (A), (B), and (C), and preferably further contains the component (D), thereby providing excellent skin retention of the anti-inflammatory component. Therefore, by containing the anti-inflammatory component as the component (E), the effect of improving rough skin can be sustained.

[0061] The anti-inflammatory component of component (E) is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include dipotassium glycyrrhizinate, allantoin, stearyl glycyrrhetinate, etc. These may be used alone or in combination of two or more.

[0062] The anti-inflammatory component of the component (E) may be an appropriately synthesized product or a commercially available product. Examples of commercially available anti-inflammatory ingredients for component (E) include, by trade name, dipotassium glycyrrhizinate (dipotassium glycyrrhizinate, manufactured by Maruzen Pharmaceuticals Co., Ltd.), allantoin (manufactured by Kawaken Fine Chemicals Co., Ltd.), and C-O-gletinol (stearyl glycyrrhetinate, manufactured by Maruzen Pharmaceuticals Co., Ltd.).

[0063] The content of the anti-inflammatory component of the component (E) is not particularly limited and can be selected appropriately depending on the purpose. The content of the dipotassium glycyrrhizinate is preferably 0.05% by mass to 0.3% by mass relative to the total amount of the liquid skin cleanser composition. The content of the allantoin is preferably 0.05% by mass to 0.1% by mass relative to the total amount of the liquid skin cleanser composition. The content of the stearyl glycyrrhetinate is preferably 0.05% by mass to 0.3% by mass relative to the total amount of the liquid skin cleanser composition.

[0064] <Other ingredients> In addition to the components (A), (B), (C), (D), and (E), other components may be blended into the liquid skin cleanser composition as needed, provided that the effects of the present invention are not impaired.

[0065] Examples of the other components include surfactants other than the components (A) and (D), water-soluble polymers other than the components (B) and (C), oils, silicones, alcohols, lanolin derivatives, protein derivatives, drugs (e.g., vitamins), moisturizers, disinfectants, preservatives, pH adjusters, antioxidants, sequestering agents, UV absorbers or UV scattering agents, animal and plant extracts or derivatives thereof, chelating agents, amino acids, coloring materials, fragrances, pigments, inorganic powders, clay minerals, water-insoluble polymer compound powders, etc. These may be used alone or in combination of two or more.

[0066] <<Oil content>> Examples of the oils include vegetable oils and fats such as castor oil, olive oil, cocoa oil, hardened palm oil, camellia oil, coconut oil, Japan 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, spermaceti, 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 alone or in combination of two or more.

[0067] The content of the oil is not particularly limited as long as it does not impair the effects of the present invention and can be selected appropriately depending on the purpose, but is preferably 0.1% by mass to 3% by mass relative to the total amount of the liquid skin cleanser composition.

[0068] <<Alcoholic beverages>> Examples of the alcohols include lower or higher alcohols, and specific examples thereof include natural and synthetic higher alcohols such as cetyl alcohol, oleyl alcohol, stearyl alcohol, hexyldecanol, octyldodecanol, lauryl alcohol, etc. These may be used alone or in combination of two or more.

[0069] The content of the 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 is preferably 0.1% by mass to 3% by mass relative to the total amount of the liquid skin cleanser composition.

[0070] <<Vitamins>> Examples of the vitamins 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, and derivatives thereof. These may be used alone or in combination of two or more.

[0071] The content of the vitamins 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 0.001% by mass to 0.5% by mass relative to the total amount of the liquid skin cleanser composition.

[0072] <<Moisturizer>> Examples of the moisturizing agent include isoprene glycol, 1,2-pentanediol, diethylene glycol, diethylene glycol monoalkyl ether, propylene glycol, polypropylene glycol, hydrogenated castor oil (30 E.O.), diglycerin, triglycerin, polyglycerin, etc. These may be used alone or in combination of two or more. In this specification, "EO" represents the average unreacted moles of ethylene oxide.

[0073] The content of the alcohols is not particularly limited as long as the effects of the present invention are not impaired, and it can be appropriately selected according to the purpose. However, it is preferably 0.1% by mass to 10% by mass based on the total amount of the liquid skin cleansing agent composition.

[0074] <<Preservative>> Examples of the preservative include benzoates, sorbates, dehydroacetates, paraoxybenzoic acid esters, 2,4, dichlorophene, 3,4,4'-trichlorocarbanilide, benzalkonium chloride, hinokitiol, resorcinol, methylchloroisothiazolinone·methylisothiazolinone solution (trade name: Kathon CG, manufactured by Rohm and Haas Japan Co., Ltd.), salicylic acid, pentanediol, phenoxyethanol, ethanol, monoethanolamine, and the like. These may be used alone or in combination of two or more.

[0075] The content of the preservative is not particularly limited as long as the effects of the present invention are not impaired, and it can be appropriately selected according to the purpose. However, it is preferably 0.1% by mass to 1% by mass based on the total amount of the liquid skin cleansing agent composition.

[0076] <<pH adjuster>> Examples of the pH adjuster include sodium hydroxide, potassium hydroxide, citric acid, hydrochloric acid, succinic acid, triethanolamine, aqueous ammonia, triisopropanolamine, phosphoric acid, glycolic acid, and the like. These may be used alone or in combination of two or more.

[0077] The content of the pH adjuster is not particularly limited as long as it can be adjusted to a desired pH, and it can be appropriately selected according to the purpose.

[0078] <<Antioxidant>> Examples of the antioxidant include dibutylhydroxytoluene, butylhydroxyanisole, ascorbic acid, and the like. These may be used alone or in combination of two or more.

[0079] 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 is preferably 0.1% by mass to 1% by mass relative to the total amount of the liquid skin cleanser composition.

[0080] <<UV absorber or UV scattering agent>> Examples of the ultraviolet absorber or ultraviolet scattering agent include 2-hydroxy-4-methoxybenzophenone, octyl dimethyl para-aminobenzoate, ethylhexyl para-methoxycinnamate, titanium oxide, kaolin, talc, etc. These may be used alone or in combination of two or more.

[0081] The content of the ultraviolet absorber or ultraviolet 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.

[0082] <<Chelating agent>> Examples of the chelating agent include disodium edetate, ethylenediaminetetraacetate, hexametaphosphate, gluconic acid, etc. These may be used alone or in combination of two or more.

[0083] 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% by mass to 1% by mass relative to the total amount of the liquid skin cleanser composition.

[0084] <<Amino acids>> Examples of the amino acids include glycine, alanine, valine, leucine, isoleucine, phenylalanine, tryptophan, cystine, cysteine, methionine, proline, hydroxyproline, aspartic acid, glutamic acid, arginine, histidine, lysine, and derivatives thereof. These may be used alone or in combination of two or more.

[0085] 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 is preferably 0.001% by mass to 0.5% by mass relative to the total amount of the liquid skin cleanser composition.

[0086] <<Water-insoluble polymer compound powder>> Examples of the water-insoluble polymer compound powder include nylon, polyethylene, etc. These may be used alone or in combination of two or more.

[0087] 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.

[0088] -pH- The pH of the liquid skin cleanser composition at 25° C. is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 8.0 to 10.0, more preferably 8.8 to 9.8. The pH can be measured, for example, using a glass electrode color hydrogen ion concentration indicator HM-30R (manufactured by DKK-TOA Corporation, electrode type GST-5721).

[0089] -viscosity- The viscosity of the liquid skin cleanser composition at 25°C is not particularly limited and can be appropriately selected depending on the container used, etc., but is preferably 4 mPa·s to 40 mPa·s, and more preferably 8 mPa·s to 30 mPa·s. For example, when using a pump foamer container capable of discharging foam by depressing the nozzle part and one 305 mesh and one 200 mesh porous membrane, the viscosity of the liquid skin cleanser composition under the temperature conditions used is preferably 30 mPa s or less, and more preferably 25 mPa s or less. 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., at a rotation speed of 60 rpm, using a No. 1 rotor, and measuring the viscosity after 1 minute.

[0090] -container- The liquid skin cleanser composition is preferably of the type that is filled in a foamer container and discharged in the form of foam. The former container is not particularly limited and can be appropriately selected from known former containers, for example, a non-gas type foam discharging container, an aerosol container using a propellant and a pressure-resistant container, etc. Among these, a non-gas type foam discharging container is preferred.

[0091] The non-gas foam-dispensing container is not particularly limited as long as it can mix the liquid skin cleanser composition with air and dispense it in a foamed state, and can be appropriately selected depending on the purpose. Examples include a squeeze foamer container that can dispense foam by manually squeezing the bottle body, and a pump foamer container that can dispense foam by depressing the nozzle. Such foamer containers can be manufactured by Yamato Seikan Co., Ltd., Yoshino Kogyosho Co., Ltd., etc. More specifically, foamer containers described in JP-A-7-315463, JP-A-8-230961, JP-A-2005-193972, etc. can be used.

[0092] The non-gas type foam-dispensing container has a foam-forming member, specifically a porous membrane body (preferably made of a plastic material such as nylon, polyester, or polyolefin) for forming foam, and foam is formed when the liquid skin cleanser composition passes through the porous membrane body.

[0093] The mesh of the porous membrane is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 100 mesh or more, more preferably 100 mesh to 400 mesh, and particularly preferably 200 mesh to 305 mesh. The number of the porous membrane bodies is not particularly limited and can be appropriately selected depending on the purpose, but from the viewpoint of improving foam performance, 2 to 4 membrane bodies are preferred.

[0094] -Manufacturing method- The method for producing the liquid skin cleanser composition is not particularly limited and can be appropriately selected depending on the purpose. For example, the liquid skin cleanser composition can be obtained by mixing the component (A), the component (B), and the component (C), and further, as necessary, the component (D), the component (E), the other components, and purified water (blended as the remainder so that the total liquid skin cleanser composition becomes 100% by mass). Specifically, the composition can be produced by separately heating and dissolving the components (A), (B), and (C) in purified water and the purified water, and then adding preferably the components (D) and (E), and further the other components as necessary.

[0095] The liquid skin cleanser composition may be prepared using an apparatus that is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include a stirring apparatus equipped with stirring blades that exert shear force and can mix the entire composition. The stirring blade is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include a propeller, a turbine, and a disperser.

[0096] -Applications- The area where the liquid skin cleanser composition is to be used is not particularly limited and can be appropriately selected depending on the purpose. For example, the liquid skin cleanser composition can be used on the whole body, face, hands, etc.

[0097] The use of the liquid skin cleanser composition is not particularly limited and can be appropriately selected depending on the purpose, but since the liquid skin cleanser composition is non-irritating to the skin, produces dense foam, and is excellent in leaving the skin moist and not feeling tight after towel drying, and further has excellent retention of the anti-inflammatory ingredient on the skin, the liquid skin cleanser composition can be used, for example, in body shampoo, body soap, facial cleanser, hand soap, foam hand soap, cleansing foam, makeup remover, etc., and is preferably used in body soap. [Example]

[0098] EXAMPLES The present invention will be specifically explained below with reference to examples and comparative examples, but the present invention is not limited to these examples in any way.

[0099] The content of each component in the examples and comparative examples is expressed in "% by mass," with the total amount being 100% by mass, and all values ​​are calculated as pure contents. The mass ratio of the content (% by mass) of component (B) to the content (% by mass) of component (C) [(B) / (C)] was rounded to one decimal place and reported. The mass ratio of the content (% by mass) of component (A) to the sum of the content (% by mass) of component (B) and the content (% by mass) of component (C) [(A) / (B+C)] was rounded to one decimal place and reported.

[0100] (Examples 1 to 29 and Comparative Examples 1 to 9) Liquid skin cleansing compositions of Examples 1 to 29 and Comparative Examples 1 to 9 having the compositions and contents shown in Tables 1 to 4 below were prepared according to the following method.

[0101] A solution was prepared by dissolving component (A) or a comparative component (anionic surfactant) of component (A) in purified water. The purified water was used in an amount such that the total amount of the components before pH adjustment, after mixing, would be 95% by mass of the final liquid skin cleanser composition. Component (C) was separately dissolved in purified water with heating to prepare a solution. To the solution of component (A) or the comparative component of component (A), component (B) or the comparative component of component (B), the solution of component (C) or the comparative component of component (C) (cationic polymer), and component (E) were added. In Examples 17 to 19, component (D) was also added. Subsequently, the common components propylene glycol, phenoxyethanol, monoethanolamine, and fragrance were added. If the pH was below the predetermined value (pH 9.5), the common component citric acid was added to adjust the pH to the predetermined value, and purified water was added to make the total amount 100% by mass, thereby obtaining the liquid skin cleanser compositions of Examples 1 to 29 and Comparative Examples 1 to 9.

[0102] When preparing each of the liquid skin cleanser compositions of Examples 1 to 29 and Comparative Examples 1 to 9, a propeller was used as the stirring blade, and stirring was carried out using a Three-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).

[0103] The obtained liquid skin cleansing compositions of Examples 1 to 29 and Comparative Examples 1 to 9 were filled into a container with a foamer pump dispenser [discharge volume 3 mL, manufactured by Yoshino Kogyosho Co., Ltd.] and used in the following evaluations.

[0104] The liquid skin cleanser compositions of Examples 1 to 29 and Comparative Examples 1 to 9 were evaluated and judged for "lack of skin irritation," "denseness of foam," "moist feeling of skin after towel drying," "lack of tight feeling of skin after towel drying," and "skin retention of anti-inflammatory ingredient" as follows. The results are shown in Tables 1 to 4 below.

[0105] <No skin irritation> Ten expert evaluators dispensed two pumps (approximately 6 g) of each liquid skin cleanser composition of Examples 1 to 29 and Comparative Examples 1 to 9 into the palm of their hands, washed the entire body with their hands, rinsed with warm water at 40°C, towel-dried, and then rested in a thermostatic chamber at 25°C for 30 minutes, after which the "freedom of skin irritation" was evaluated based on the following evaluation criteria. The results were calculated by calculating the average score of the 10 expert evaluators and judging based on the following criteria for judging the average score. -Evaluation criteria for "non-skin irritation"- 4 points: No skin irritation 3 points: Slight skin irritation 2 points: Skin irritation 1 point: Strong skin irritation -Criteria for determining "non-skin irritation"- ◎: Average score is between 3.5 and 4.0 points ○: The average score is between 3.0 and 3.5 points △: Average score is less than 3.0 points

[0106] <Foam density> Ten expert evaluators dispensed two pumps (approximately 6 g) of each liquid skin cleanser composition of Examples 1 to 29 and Comparative Examples 1 to 9 into the palm of their hands, washed their entire bodies with their hands, and then took the foam from the whole body into their hands and observed the feel of the foam bouncing back when pressed together with both hands, and how easily it dripped when their hands were turned upside down, and evaluated the "foam density" based on the following evaluation criteria. The results were calculated by calculating the average score of the 10 expert evaluators and judging based on the following criteria for judging the average score. -Evaluation criteria for "foam density"- 4 points: The foam is firm and does not drip even when the hand is turned upside down. 3 points: The foam is slightly hard and does not drip even when the hand is turned upside down. 2 points: The foam is a little soft and tends to drip when you hold your hand upside down. 1 point: The foam is soft and drips when you hold your hand upside down - Criteria for determining "foam density" - ◎: Average score is between 3.5 and 4.0 points ○: The average score is between 3.0 and 3.5 points △: Average score is between 2.0 and 3.0 points ×: The average score is less than 2.0 points

[0107] <Moisturized skin after towel drying> Ten expert evaluators dispensed two pumps (approximately 6 g) of each liquid skin cleanser composition of Examples 1 to 29 and Comparative Examples 1 to 9 into the palm of their hands, washed the entire body with their hands, rinsed with warm water at 40°C, towel-dried, and then rested in a thermostatic chamber at 25°C for 30 minutes, after which the "moist feeling of skin after towel-drying" was evaluated based on the following evaluation criteria. The results were calculated by calculating the average score of the 10 expert evaluators and judging based on the following criteria for judging the average score. -Evaluation criteria for "moisturized skin after towel drying"- 4 points: Strong moist feeling 3 points: Feels moist 2 points: Slightly moist feeling 1 point: No moist feeling -Criteria for determining "moisturized skin after towel drying"- ◎: Average score is between 3.5 and 4.0 points ○: The average score is between 3.0 and 3.5 points △: Average score is between 2.0 and 3.0 points ×: The average score is less than 2.0 points

[0108] <No tightness after towel drying> Ten expert evaluators dispensed two pumps (approximately 6 g) of each liquid skin cleanser composition of Examples 1 to 29 and Comparative Examples 1 to 9 into the palm of their hands, washed the entire body with their hands, rinsed with warm water at 40°C, towel-dried, and then rested in a thermostatic chamber at 25°C for 30 minutes, after which the "absence of tightness of skin after towel-drying" was evaluated based on the following evaluation criteria. The results were calculated by calculating the average score of the 10 expert evaluators and judging based on the following criteria for judging the average score. -Evaluation criteria for "no tightness of skin after towel drying"- 4 points: No tightness 3 points: Slight feeling of tightness 2 points: Feeling of tightness 1 point: Strong feeling of tension -Criteria for determining "the lack of tightness of skin after towel drying"- ◎: Average score is between 3.5 and 4.0 points ○: The average score is between 3.0 and 3.5 points △: Average score is between 2.0 and 3.0 points ×: The average score is less than 2.0 points

[0109] <Skin retention of anti-inflammatory ingredients> Ten expert evaluators applied one pump (approximately 3 g) of each liquid skin cleanser composition of Examples 1 to 29 and Comparative Examples 1 to 9 to the palm of their hand, washed the inside of their upper arm with their hands, rinsed with warm water at 40°C, towel-dried, and then allowed to rest for 30 minutes in a thermostatic chamber at 25°C, after which the inside of their upper arm was tape-stripped. The area on the inside of the upper arm to which the liquid skin cleanser composition was applied was a square measuring 3 cm in length and 3 cm in width (application area 9 cm). 2 The tape was a square measuring 3.5 cm in length and 3.5 cm in width (application area 12.25 cm). 2) was used to cover the entire applied area and tape stripping was performed. The tape was immersed in methanol and allowed to stand at room temperature (25°C ± 5°C) for 2 hours to extract the deposits. The resulting extract was used as a measurement sample, and the mass of each anti-inflammatory ingredient (Examples 1 to 27 and Comparative Examples 1 to 9: dipotassium glycyrrhizinate, Example 28: allantoin, Example 29: stearyl glycyrrhetinate) in the measurement sample was quantified under the following analytical conditions by analysis using an internal standard method with high performance liquid chromatography (HPLC). The results were averaged by 10 expert evaluators, and the adhesion rate to the skin relative to the blended amount of the anti-inflammatory ingredient in the liquid skin cleanser composition was calculated using the following formula, and the "skin retention of the anti-inflammatory ingredient" was evaluated based on the following criteria. [HPLC analysis conditions] Equipment: GL 7700 (GL Sciences Inc.) Detector: PD7752 (GL Sciences Inc.) Column: a column packed with octadecylsilylated silica gel for liquid chromatography (TSK (registered trademark) gel ODS-80™, inner diameter 4.6 mm, length 15 cm, particle size 5 μm, manufactured by Tosoh Corporation) Column temperature: 45℃ Eluent: methanol / water = 7 / 3 (V / V) mixture ·Injection volume: 20μL Standard products: Dipotassium glycyrrhizinate (External Dipotassium Glycyrrhizinate, Maruzen Pharmaceuticals Co., Ltd.), Allantoin (Kawaken Chemical Co., Ltd.), or Stearyl Glycyrrhetinate (C-O-Retinol, Maruzen Pharmaceuticals Co., Ltd.) [Calculation formula] Adhesion rate of anti-inflammatory ingredients to the skin (%) = X / Y x 100 (In formula (1), "X" represents the mass (mg) of each anti-inflammatory component determined by HPLC analysis, and "Y" represents the mass (mg) of each anti-inflammatory component contained in 3 g of the liquid skin cleanser composition.) -Criteria for determining "skin retention of anti-inflammatory ingredients"- ◎: The adhesion rate of anti-inflammatory ingredients to the skin is 0.1% or more ○: The adhesion rate of anti-inflammatory ingredients to the skin is 0.01% or more but less than 0.1% △: The adhesion rate of anti-inflammatory ingredients to the skin is 0.001% or more but less than 0.01% ×: The adhesion rate of the anti-inflammatory ingredient to the skin is less than 0.001%

[0110] [Table 1]

[0111] [Table 2]

[0112] [Table 3]

[0113] [Table 4]

[0114] Details of each component used in Examples 1 to 29 and Comparative Examples 1 to 9 are shown in Table 5 below.

[0115] [Table 5] *1: Potassium laurate, the comparative component of component (A), was prepared by neutralizing lauric acid (NAA-122, manufactured by NOF Corporation) with potassium hydroxide (liquid caustic potash, manufactured by Asahi Glass Co., Ltd.). *2: The comparative component of component (B), acrylamide-dimethyldiallylammonium chloride-acrylic acid copolymer (Marcoat 3330PR, manufactured by Lubrizol Japan Co., Ltd.), is a polymer compound having a structure represented by the following general formula (1), where n is 34, m is 31, and z is 35. [ka] In the general formula (1), n, m, and z represent the molar ratio (mol %) of each structural unit, and n+m=100. [Industrial Applicability]

[0116] The liquid skin cleanser composition can be suitably used in a foamer container, is non-irritating to the skin, produces dense foam, and is excellent in leaving the skin feeling moisturized and free of tightness after towel drying. Furthermore, the anti-inflammatory ingredient is excellent in retention on the skin. Therefore, the liquid skin cleanser composition can be used, for example, in body shampoos, body soaps, facial cleansing foams, hand soaps, foaming hand soaps, cleansing foams, makeup removers, and the like.

Claims

1. (A) an amino acid-based surfactant; (B) a cationic polymer containing dimethyldiallylammonium chloride as a monomer unit, in which the molar ratio of the dimethyldiallylammonium chloride is 40% or more; (C) a cationized polysaccharide; (E) an anti-inflammatory component; Contains the mass ratio of the content of the component (B) to the content of the component (C) [(B) / (C)] is 1.0 to 4.0; A liquid skin cleanser composition, wherein the mass ratio [(A) / (B+C)] of the content of the component (A) to the sum of the content of the component (B) and the content of the component (C) is 2.5 to 26.

7.

2. The liquid skin cleanser composition according to claim 1, further comprising (D) at least one amphoteric surfactant selected from the group consisting of aminopropionic acid-based amphoteric surfactants and betaine-based amphoteric surfactants.

3. 3. The liquid skin cleanser composition according to claim 1, wherein the mass ratio [(A) / (B+C)] of the content of the component (A) to the sum of the content of the component (B) and the content of the component (C) is 4.0 to 20.

0.

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

5. The liquid skin cleanser composition according to claim 2, wherein the content of the component (D) is 3% by mass to 15% by mass.

6. The liquid skin cleanser composition according to any one of claims 1 to 5, which is filled in a former container.

Images