Liquid skin cleansing composition

Abstract

To provide a liquid skin cleanser composition having excellent foam sustainability and sufficiently satisfying the sustainability of all of skin moisture feeling after drying with towel, no stickiness of skin after drying with towel, skin dry feeling after drying with towel.SOLUTION: There is provided a liquid skin cleanser composition which comprises (A) an anionic surfactant, (B) at least one cationic polymer selected from a dimethyldiallylammonium chloride polymer and a dimethyldiallylammonium chloride-acrylic acid copolymer, (C) a quaternary ammonium salt containing a long-chain alkyl group and (D) at least one selected from dimethicone and dimethiconol, wherein the molar ratio of a structural unit derived from the dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer of the component (B) is 40 mol% or more and the mass ratio [{(B)+(C)} / (A)] of the total content of the component (B) and the component (C) to the content of the component (A) is 0.005 to 0.08.SELECTED DRAWING: None

Description

[Technical field]

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

[0002] It has been desired that liquid skin cleansing compositions such as hand soaps and body soaps have good foaming performance such as foam retention and provide a moist feeling to the skin after cleansing. In addition, in hot summer climates, there is a demand for a liquid skin cleansing composition that can provide a dry feeling to the skin without stickiness for a long time after cleansing and has high moisturizing properties.

[0003] In order to improve the condition of the skin after washing, for example, a liquid skin cleanser composition containing a fatty acid salt and a cationic polymer having a structural unit derived from dimethyldiallylammonium chloride has been proposed (see, for example, Patent Document 1). However, the proposed liquid skin cleanser composition was not satisfactory in terms of the moist feeling of the skin after towel drying and the durability of the dry feeling of the skin after towel drying.

[0004] Also, a liquid skin cleanser composition containing a fatty acid salt, a cationic polymer, an oil, a silicone, and a polyhydric alcohol has been proposed (see, for example, Patent Document 2). However, the proposed liquid skin cleanser composition was not fully satisfactory in terms of moist feeling of the skin after towel drying, non-stickiness of the skin after towel drying, and durability of the dry feeling of the skin after towel drying.

[0005] Therefore, there is a demand for a liquid skin cleanser composition that has excellent foam retention and satisfactorily satisfies all of the following requirements: moist feeling of skin after towel drying, non-stickiness of skin after towel drying, and sustained dry feeling of skin after towel drying. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2004-262838 A [Patent Document 2] JP 2009-67734 A Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention aims to solve the above-mentioned problems in the prior art and to achieve the following object: That is, the present invention aims to provide a liquid skin cleansing composition that has excellent foam retention and satisfactorily satisfies all of the following requirements: moist feeling of skin after towel drying, non-stickiness of skin after towel drying, and sustained dry feeling of skin after towel drying. [Means for solving the problem]

[0008] As a result of intensive research to achieve the above-mentioned object, the present inventors have found that a liquid skin cleansing composition comprising (A) an anionic surfactant, (B) at least one cationic polymer selected from a dimethyldiallylammonium chloride polymer and a dimethyldiallylammonium chloride-acrylic acid copolymer, (C) a long-chain alkyl group-containing quaternary ammonium salt, and (D) at least one selected from dimethicone and dimethiconol, wherein the molar ratio of structural units derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer of the component (B) is 40 mol % or more, and the mass ratio of the total content of the components (B) and (C) to the content of the component (A), [{(B)+(C)} / (A)], is 0.005 to 0.08, provides excellent foam retention, prevents stickiness on the skin after towel drying even in hot summer weather, provides a dry feeling on the skin for a long time after towel drying, and provides an excellent moist feeling on the skin 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 anionic surfactant; (B) at least one cationic polymer selected from a dimethyldiallylammonium chloride polymer and a dimethyldiallylammonium chloride-acrylic acid copolymer; (C) a long-chain alkyl group-containing quaternary ammonium salt; (D) at least one selected from dimethicone and dimethiconol; Contains the molar ratio of structural units derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer of the component (B) is 40 mol % or more; The liquid skin cleansing composition is characterized in that the mass ratio of the total content of the component (B) and the component (C) to the content of the component (A), [{(B)+(C)} / (A)], is 0.005 to 0.08. <2> The content of the component (A) is 10% by mass to 20% by mass, The content of the (B) component is 0.2% by mass to 0.8% by mass, The content of the component (C) is 0.005% by mass to 0.04% by mass, The content of the component (D) is 0.02% by mass to 0.4% by mass. <1> The liquid skin cleansing composition according to claim 1, <3> The above-mentioned composition is filled in a former container. <1> from <2> 1. The liquid skin cleansing composition according to claim 1 , Effect of the Invention

[0010] According to the present invention, the above-mentioned conventional problems can be solved, the above-mentioned objects can be achieved, and a liquid skin cleanser composition can be provided which has excellent foam retention and satisfactorily satisfies all of the following requirements: moist feeling of skin after towel drying, non-stickiness of skin after towel drying, and sustained dry feeling of skin after towel drying. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] (Liquid skin cleansing composition) The liquid skin cleanser composition of the present invention contains (A) an anionic surfactant, (B) at least one cationic polymer selected from a dimethyldiallylammonium chloride polymer and a dimethyldiallylammonium chloride-acrylic acid copolymer, (C) a long-chain alkyl group-containing quaternary ammonium salt, and (D) at least one selected from dimethicone and dimethiconol, and further contains other components as necessary.

[0012] <(A) Anionic Surfactant> The anionic surfactant as component (A) is mainly contained to improve foam retention. In this specification, "foam retention" means that the foam is maintained without disappearing.

[0013] The anionic surfactant of the component (A) is not particularly limited and can be appropriately selected according to the purpose, and examples thereof include higher fatty acid salts, polyoxyethylene (POE) alkyl ether sulfates, ether carboxylates, amino acid surfactants, etc. These may be used alone or in combination of two or more. Among these, higher fatty acid salts are preferred from the viewpoints of foam retention, moist feeling of skin after towel drying, and sustained dry feeling of skin after towel drying.

[0014] -Higher fatty acid salts- The higher fatty acid salt in the component (A) is not particularly limited and can be appropriately selected according to the purpose, and examples thereof include laurate, myristate, palmitate, stearate, etc. These may be used alone or in combination of two or more. Among these, from the viewpoints of foam retention, moist feeling of skin after towel drying, and sustained dry feeling of skin after towel drying, higher fatty acid salts containing both laurate and myristate are preferred.

[0015] The counter ion of the higher fatty acid salt is not particularly limited and can be appropriately selected depending on the purpose. Examples of the counter ion include alkali metal salts, amine salts, and amino acid salts. The alkali metal salt is not particularly limited and can be appropriately selected depending on the purpose. Examples of the alkali metal salt include sodium salts and potassium salts. The amine salt is not particularly limited and can be appropriately selected depending on the purpose. Examples of the amine salt include ammonium salts; monoethanolamine salts, diethanolamine salts, triethanolamine salts, and alkanolamine salts such as 2-amino-2-methylpropanol and 2-amino-2-methylpropanediol. The amino acid salt is not particularly limited and can be appropriately selected depending on the purpose. Examples of the amino acid salt include lysine salt and arginine salt. Among these, the alkali metal salts are preferred, and the potassium salts are particularly preferred, in terms of excellent foam retention.

[0016] The higher fatty acid salt may be appropriately synthesized or may be a commercially available product. Examples of commercially available higher fatty acid salts include, by trade name, NIKKOL potassium laurate LK-120 (potassium laurate, manufactured by Nikko Chemicals Co., Ltd.), NIKKOL potassium myristate MK-140 (potassium myristate, manufactured by Nikko Chemicals Co., Ltd.), and Tysoap MNK-40 (liquid blend of potassium coconut oil fatty acid and potassium myristate, manufactured by Nikko Chemicals Co., Ltd.).

[0017] The higher fatty acid salt can be blended as a higher fatty acid salt, but a higher fatty acid and a salt serving as the counter ion, such as potassium hydroxide, may be added separately to a blending tank and subjected to a neutralization reaction to form a higher fatty acid salt.

[0018] The higher fatty acid used in the preparation of the higher fatty acid salt may be an appropriately synthesized product or a commercially available product. Examples of commercially available higher fatty acid salts include, by trade name, NAA (registered trademark)-122 (lauric acid, manufactured by NOF Corporation), NAA (registered trademark)-142 (myristic acid, manufactured by NOF Corporation), NAA (registered trademark)-160 (palmitic acid, manufactured by NOF Corporation), and NAA (registered trademark)-180 (stearic acid, manufactured by NOF Corporation).

[0019] The content of the laurate salt is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 3% by mass to 12% by mass, and more preferably 7% by mass to 10% by mass, based on the total amount of the liquid skin cleanser composition.

[0020] The content of the myristate salt is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 4% by mass to 14% by mass, and more preferably 8% by mass to 14% by mass, based on the total amount of the liquid skin cleansing composition.

[0021] The content of the palmitate is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 1% by mass to 9% by mass, and more preferably 3% by mass to 9% by mass, based on the total amount of the liquid skin cleansing composition.

[0022] The content of the stearate is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 0.1% by mass to 3% by mass, and more preferably 0.2% by mass to 1% by mass, based on the total amount of the liquid skin cleansing composition.

[0023] -Polyoxyethylene alkyl ether sulfate- The polyoxyethylene alkyl ether sulfate in the 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 polyoxyethylene alkyl ether sulfate may be used alone or in combination of two or more kinds. [ka]

[0024] In the general formula (A1), R 7 represents an alkyl group, and the alkyl group moiety preferably has 10 to 14 carbon atoms.

[0025] In the general formula (A1), n ​​represents the average number of moles of ethylene oxide (EO) added, and the average number of moles of ethylene oxide added is preferably 1 to 5.

[0026] In the general formula (A1), X represents an alkali metal or ammonium. The alkali metal is not particularly limited and can be appropriately selected depending on the purpose. Examples of the alkali metal include sodium and potassium.

[0027] Specific examples of the polyoxyethylene alkyl ether sulfate include polyoxyethylene (1) sodium lauryl ether sulfate, polyoxyethylene (2) sodium lauryl ether sulfate (also known as POE (2) sodium laureth sulfate), polyoxyethylene (3) sodium lauryl ether sulfate (also known as POE (3) sodium laureth sulfate), polyoxyethylene (4) sodium lauryl ether sulfate, polyoxyethylene (5) sodium lauryl ether sulfate, polyoxyethylene (3) sodium alkyl (C12,13) ​​ether sulfate, polyoxyethylene (2) lauryl ether ammonium sulfate, and polyoxyethylene (3) lauryl ether ammonium sulfate. The numerical value in the parentheses indicates the average number of moles (n) of ethylene oxide (EO) added.

[0028] The polyoxyethylene alkyl ether sulfate may be a suitably synthesized product or a commercially available product. Examples of commercially available polyoxyethylene alkyl ether sulfates include Texapon (registered trademark) N70 (manufactured by BASF, sodium polyoxyethylene (2) lauryl ether sulfate) and Shinorin SPE-1250 (manufactured by New Japan Chemical Co., Ltd., sodium polyoxyethylene (2) lauryl ether sulfate).

[0029] -Ether carboxylate- The ether carboxylate in the component (A) is not particularly limited and may be appropriately selected depending on the purpose, and examples thereof include compounds represented by the following general formula (A2) or (A3): The ether carboxylate may be used alone or in combination of two or more kinds. [ka]

[0030] In the general formulas (A2) and (A3), R 8 represents a linear or branched alkyl or alkenyl group having 5 to 23 carbon atoms, or a phenyl group substituted with a linear or branched alkyl or alkenyl group having 5 to 23 carbon atoms; 8 The moiety preferably has 10 to 14 carbon atoms.

[0031] In the general formula (A2), R 9 may be the same or different and represent an alkylene group having 2 to 4 carbon atoms, preferably 2 carbon atoms.

[0032] In the general formula (A2), o represents an average added mole number of 1 to 20 of alkylene oxide, and the average added mole number of alkylene oxide is preferably 1 to 5.

[0033] In the general formulas (A2) and (A3), M 1 represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium, or a basic amino acid.

[0034] Specific examples of the ether carboxylate represented by the general formula (A2) or (A3) include polyoxyethylene (3) sodium lauryl ether acetate, polyoxyethylene (4) potassium lauryl ether acetate, and sodium lauryl glycol acetate. The numerical value in the parentheses indicates the average number of moles (o) of alkylene oxide added.

[0035] The ether carboxylate may be an appropriately synthesized product or a commercially available product. Examples of commercially available ether carboxylates include, by trade name, Energyl EC-30 (manufactured by Lion Specialty Chemicals Co., Ltd., polyoxyethylene (3) lauryl ether sodium acetate), Viewlite LCA-25F (polyoxyethylene (3) lauryl ether sodium acetate), Viewlite LCA-30D (polyoxyethylene (3) lauryl ether sodium acetate), Viewlite LCA-H (polyoxyethylene (4) lauryl ether acetic acid), Viewlite LCA-25NH (laureth-4 carboxylic acid), Viewlite SHAA (sodium lauryl glycol carboxylate), Viewlite LCA (polyoxyethylene (3) lauryl ether sodium acetate) (all manufactured by Sanyo Chemical Industries, Ltd.), Kao Akipo RLM-45NV (polyoxyethylene (4.5) lauryl ether sodium acetate), and Kao Akipo RLM-100NV (polyoxyethylene (10) lauryl ether sodium acetate) (all manufactured by Kao Corporation). The numerical value in the parentheses indicates the average number of moles (o) of alkylene oxide added.

[0036] -Amino acid surfactant- The amino acid surfactant in the 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 (A4): The amino acid surfactant may be used alone or in combination of two or more kinds. [ka]

[0037] In the general formula (A4), R 10 represents a linear or branched alkyl or alkenyl group having 5 to 23 carbon atoms, or a phenyl group substituted with a linear or branched alkyl or alkenyl group having 5 to 23 carbon atoms. 10 The moiety preferably has 8 to 18 carbon atoms.

[0038] In the general formula (A4), R 11 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.

[0039] In the general formula (A4), R 12 and R 13 may be the same or different, and each represents a hydrogen atom or -(CH2) m -COOM 2 Shows.

[0040] In the general formula (A4), m and n may be the same or different and represent a number of 0 to 20.

[0041] In the general formula (A4), 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.

[0042] The amino acid structure of the hydrophilic portion of the amino acid surfactant is not particularly limited and can be appropriately selected depending on the purpose, but glycine, glutamic acid, and methylalanine are preferred.

[0043] Specific examples of the amino acid surfactant represented by the general formula (A4) include N-acylglycines and salts thereof, such as N-cocoylglycine potassium (N-coconut fatty acid acylglycine potassium); N-acyl-N-carboxyethyl-glycines and salts thereof, such as N-myristoyl-N-carboxyethyl-glycine sodium; N-acylglutamic acids and salts thereof, such as sodium N-myristoyl-L-glutamate, potassium N-myristoyl-L-glutamate, potassium N-coconut fatty acid acyl-L-glutamate, sodium N-palm fatty acid acyl-L-glutamate, and sodium N-stearoyl-L-glutamate; and N-lauroyl-N-methyl-β-alanine potassium.

[0044] The amino acid-based surfactant may be appropriately synthesized or may be a commercially available product. Examples of commercially available amino acid surfactants include Amirite (registered trademark) GCK-11 (potassium N-coconut oil fatty acid acylglycine), Amirite (registered trademark) GCK-12K (potassium N-coconut oil fatty acid acylglycine), Amirite (registered trademark) GCS-12K (sodium N-coconut oil fatty acid acylglycine), Amirite (registered trademark) GCS-11 (sodium N-coconut oil fatty acid acylglycine), Amisoft (registered trademark) CS-11 (sodium N-myristoyl-L-glutamate), Amisoft (registered trademark) CS-22 (sodium N-coconut oil fatty acid acyl-L-glutamate), Amisoft (registered trademark) LS-11 (N-lauroyl-L-glutamate), Amisoft (registered trademark) CS-22 (sodium N-coconut oil fatty acid acyl-L-glutamate), Amisoft (registered trademark) LS ... sodium glutamate), Amisoft (registered trademark) MS-11 (N-myristoyl-L-glutamate sodium), Amisoft (registered trademark) HS-11P (N-stearoyl-L-glutamate sodium), Amisoft (registered trademark) HS-11P(F) (N-stearoyl-L-glutamate sodium), Amisoft (registered trademark) HS21 (N-stearoyl-L-glutamate disodium), Amirite (registered trademark) ACS-12 (cocoyl alanine sodium) (all manufactured by Ajinomoto Healthy Supply Co., Ltd.), Aminosurfact (registered trademark) AMMS-P1 (N-myristoyl-L-glutamate sodium) (manufactured by Asahi Kasei Chemicals Corporation), NIKKOL Examples of such compounds include Sarcosinate MN (sodium myristoyl methylaminoacetate), NIKKOL Alaninate LN-30 (sodium lauroyl methyl-β-alanine) (all manufactured by Nikko Chemicals Co., Ltd.), Alanon ACE (sodium coconut oil methylalanine), Alanon AME (sodium myristoyl methyl-β-alanine), Alanon ALE (sodium lauroyl methyl-β-alanine) (all manufactured by Kawaken Fine Chemicals Co., Ltd.), Energicol L-30AN (sodium lauroyl methyl-β-alanine) (manufactured by Lion Specialty Chemicals Co., Ltd.), and Softilt AT-L (sodium lauroyl methyl-β-alanine) (manufactured by NOF Corporation).

[0045] The content of the anionic surfactant of the component (A) is not particularly limited and can be appropriately selected depending on the purpose, but from the viewpoint of foam retention and moist feeling of the skin after towel drying, it is preferably 8% by mass to 30% by mass, and more preferably 10% by mass to 20% by mass, based on the total amount of the liquid skin cleanser composition. When the content of the component (A) is 8% by mass or more, the foam retention and moist feeling of the skin after towel drying are good, and when it is 30% by mass or less, the moist feeling of the skin after towel drying is good.

[0046] <(B) At least one cationic polymer selected from dimethyldiallylammonium chloride polymers and dimethyldiallylammonium chloride-acrylic acid copolymers> The cationic polymer as component (B) is at least one selected from a dimethyldiallylammonium chloride polymer and a dimethyldiallylammonium chloride-acrylic acid copolymer, and is contained primarily to improve foam retention and moist feeling of the skin after towel drying.

[0047] The dimethyldiallylammonium chloride-acrylic acid copolymer in the component (B) is 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.

[0048] The molar ratio of structural units derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer of the component (B) is preferably 65 mol% or more, and more preferably 90 mol% or more, from the viewpoints of foam retention and moist feeling of skin after towel drying. The dimethyldiallylammonium chloride-acrylic acid copolymer may be used alone or in combination of two or more kinds.

[0049] The molar ratio of each structural unit in the dimethyldiallylammonium chloride-acrylic acid copolymer in the component (B) can be determined by measuring using nuclear magnetic resonance (NMR) under the following measurement conditions. [Measurement conditions] Solvent: Deuterium oxide (DO) Measuring instrument: JNM-LA300 (300MHz, manufactured by JEOL Ltd.)

[0050] The weight average molecular weight of the cationic polymer of the 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 the component (B) can be measured, for example, by 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).

[0051] The viscosity of a solution of the cationic polymer of the component (B) having a solid content of 30% by mass to 44% by mass at 25° C. 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, by using a Brookfield viscometer LVF (manufactured by Brookfield Corporation).

[0052] The cationic polymer of the component (B) may be appropriately synthesized or may be a commercially available product. Examples of commercially available cationic polymers of the component (B) include the following products under their trade names.

[0053] MERQUAT 100 (ingredient name: dimethyldiallylammonium chloride polymer, manufactured by Lubrizol Japan, solid 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 Corporation) at 25° C. with a rotor of spindle No. 3 at 6 revolutions per minute.

[0054] Mercoat 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 Corporation) at 25° C. with a rotor of spindle No. 1 at 60 revolutions per minute.

[0055] Mercoat 280 (component name: dimethyldiallylammonium chloride-acrylic acid copolymer, manufactured by Lubrizol Japan Corporation, solid content of 39% by mass to 43% by mass, viscosity at 25°C: 3,000 mPa s to 6,000 mPa s, weight average molecular weight of 450,000, n:m in the general formula (1) = 35:65 (molar ratio), 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. with a rotor of spindle No. 4 at 60 rpm.

[0056] Mercoat 295 (component name: dimethyldiallylammonium chloride-acrylic acid copolymer, manufactured by Lubrizol Japan Corporation, solid content of 35% by mass to 40% by mass, viscosity at 25°C: 3,500 mPa s to 9,000 mPa s, weight average molecular weight of 190,000, n:m = 5:95 (molar ratio) in the general formula (1), molar ratio of structural units derived from dimethyldiallylammonium chloride is 95 mol%). The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield Corporation) at 25° C. with a rotor of spindle No. 4 at 30 revolutions per minute.

[0057] Among these, as the cationic polymer of the component (B), Merquard 100, Merquard 280, and Merquard 295 are preferred from the viewpoints of foam retention and moist feeling on the skin after towel drying.

[0058] The content of the cationic polymer of the (B) component is not particularly limited and can be appropriately selected depending on the purpose, but from the viewpoints of foam retention, moist feeling of the skin after towel drying, and non-stickiness of the skin after towel drying, it is preferably 0.1% by mass to 1% by mass, and more preferably 0.2% by mass to 0.8% by mass, based on the total amount of the liquid skin cleanser composition. When the (B) component content is 0.1% by mass or more, foam retention and moist feeling of the skin after towel drying are good, and when it is 1% by mass or less, non-stickiness of the skin after towel drying is good.

[0059] <(C) Quaternary ammonium salt containing a long-chain alkyl group> The long-chain alkyl group-containing quaternary ammonium salt as component (C) is contained mainly to improve the durability of the dry feeling on the skin after towel drying.

[0060] The number of carbon atoms in the long-chain alkyl group in the long-chain alkyl group-containing quaternary ammonium salt of the component (C) is not particularly limited and can be appropriately selected depending on the purpose, but 6 to 24 is preferable.

[0061] The number of long-chain alkyl groups in the long-chain alkyl group-containing quaternary ammonium salt of the component (C) is not particularly limited and can be appropriately selected depending on the purpose, but one or two are preferable, and one is more preferable.

[0062] Specific examples of the long-chain alkyl group-containing quaternary ammonium salt having one long-chain alkyl group in the component (C) include lauryl trimethyl ammonium salt, cetyl trimethyl ammonium salt, stearyl trimethyl ammonium salt, behenyl trimethyl ammonium salt, cetyl dimethyl benzyl ammonium salt, stearyl dimethyl benzyl ammonium salt, and behenyl dimethyl benzyl ammonium salt. Specific examples of the long-chain alkyl group-containing quaternary ammonium salt having two long-chain alkyl groups among the component (C) include dicetyldimethylammonium salt, distearyldimethylammonium salt, dibehenyldimethylammonium salt, dicetylmethylbenzylammonium salt, distearylmethylbenzylammonium salt, and dibehenylmethylbenzylammonium salt. Specific examples of the long-chain alkyl group-containing quaternary ammonium salt having three long-chain alkyl groups in the component (C) include tricetylmethylammonium salt, tristearylmethylammonium salt, and tribehenylmethylammonium salt. These may be used alone or in combination of two or more. Among these, cetyltrimethylammonium salt, stearyltrimethylammonium salt, behenyltrimethylammonium salt, and lauryltrimethylammonium salt are preferred from the viewpoint of the durability of the dry feeling on the skin after towel drying.

[0063] The long-chain alkyl group-containing quaternary ammonium salt of the component (C) may be an appropriately synthesized product or a commercially available product. Commercially available products of the long-chain alkyl group-containing quaternary ammonium salt of the component (C) include, for example, the following trade names: KOTAMIN 60W (cetyltrimethylammonium chloride), KOTAMIN 24P (lauryltrimethylammonium chloride), KOTAMIN 86P Conc. (stearyltrimethylammonium chloride), KOTAMIN 86W (stearyltrimethylammonium chloride) (all manufactured by Kao Corporation), VARISOFT BT85 PELLETS (behentrimonium chloride isopropanol, manufactured by Evonik), NIKKOL CA-2450 (stearyltrimethylammonium chloride solution), NIKKOL CA-2330 (cetyltrimethylammonium chloride aqueous solution), NIKKOL CA-2580 (behenyltrimethylammonium chloride solution) (all manufactured by Nikko Chemicals Co., Ltd.), and Catinal. STC-25W (stearyl trimethyl ammonium chloride, manufactured by Toho Chemical Industry Co., Ltd.), Cation AB-250AQ (stearyl trimethyl ammonium chloride, manufactured by NOF Corporation), Lipocard C-50 (coconut alkyl trimethyl ammonium chloride), Lipocard T-28 (alkyl chloride (C 16-18 )trimethylammonium), Lipocard T-30 (alkyl chloride (C 14-18 )trimethylammonium), Lipocard T-50 (alkyl chloride (C 14-18 )trimethylammonium), Lipocard T-800 (alkyl chloride (C 16-18 )trimethylammonium), Lipocard 16-29 (cetyltrimethylammonium chloride), Lipocard 16-50E (cetyltrimethylammonium chloride), Lipocard 18-63 (alkyl chloride (C 16-18 )trimethylammonium), Lipocard 22-80 (behenyltrimethylammonium chloride), Lipocard CB-50 (alkyl chloride (C 8-18 ) dimethylbenzylammonium) (all manufactured by Lion Specialty Chemicals Co., Ltd.).

[0064] The content of the long-chain alkyl group-containing quaternary ammonium salt of the component (C) is not particularly limited and can be appropriately selected depending on the purpose, but from the viewpoint of non-stickiness of the skin after towel drying and the durability of the dry feeling of the skin after towel drying, it is preferably 0.001% by mass to 0.05% by mass, and more preferably 0.005% by mass to 0.04% by mass, based on the total amount of the liquid skin cleanser composition. When the content of the component (C) is 0.001% by mass or more, the dry feeling of the skin after towel drying is good, and when it is 0.05% by mass or less, the dry feeling of the skin after towel drying is good.

[0065] <Mass ratio [{(B)+(C)} / (A)]> The mass ratio [{(B)+(C)} / (A)] of the total content (mass%) of the (B) and (C) components to the content (mass%) of the (A) component is 0.005 to 0.08, preferably 0.01 to 0.06, from the viewpoint of the moist feeling of the skin after towel drying and the durability of the dry feeling of the skin after towel drying. If the mass ratio [{(B)+(C)} / (A)] is less than 0.005, the durability of the moist feeling of the skin after towel drying and the dry feeling of the skin after towel drying becomes insufficient, and if it exceeds 0.08, the lack of stickiness of the skin after towel drying becomes insufficient.

[0066] <(D) At least one selected from dimethicone and dimethiconol> At least one member selected from dimethicone and dimethiconol as the component (D) is contained mainly to improve the durability of the dry feeling on the skin after towel drying.

[0067] The dimethicone in the component (D) includes, for example, those represented by the following general formula (D1). [ka] In the general formula (D1), a represents the molar ratio (mol %) of the structural units and is from 3 to 20,000.

[0068] The kinetic viscosity at 25°C of at least one of dimethicone and dimethiconol, component (D), is not particularly limited and may be appropriately selected depending on the purpose. From the viewpoint of sustained dry feeling on the skin after towel drying, however, it is preferably 1.5 cSt to 100,000 cSt, more preferably 2 cSt to 1,000 cSt. The kinetic viscosity can be measured, for example, by the method shown below. Note that, in the following measurement method, the kinetic viscosity of dimethicone will be described, but the kinetic viscosity of dimethiconol can also be measured in the same manner. A toluene solution of dimethicone with a concentration of 1 g / 100 mL was prepared, and the specific viscosity η was calculated according to the following formula (1). sp (25°C) is calculated. Next, the intrinsic viscosity [η] is calculated by substituting it into the Huggins relational equation shown in the following formula (2). The Huggins constant K' is that described in Nakamuta, Nikka, 77,588,1956. Next, [η] is substituted into the formula of A. Kolorlov et al. shown in the following formula (3) (see Doklady Akad. Nauk. USSR 89 65. 1953) to calculate the molecular weight M. Finally, M is substituted into the formula of AJ Barry shown in the following formula (4) (see J.Appl.physics. 17. 1020. 1946) to calculate the kinetic viscosity η of dimethicone. η sp =(η / η0)-1 Equation (1) η sp =[η]+K'[η]2 ··· Equation (2) [η] = 2.15 × 10 -4 M 0.65 ··· Equation (3) logη=1.00+0.0123M 0.5 ··· Equation (4) In the formula (1), "η0" represents the viscosity of toluene, and "η" represents the viscosity of the solution. The "η0" and "η" are measured in accordance with the Viscosity Measurement Method 1 of the General Testing Methods of the Cosmetic Raw Materials Standards.

[0069] The component (D) may be an appropriately synthesized product or a commercially available product. Examples of commercially available products of the component (D) include, by trade name, the KF-96L series, KF-96A series, KF-6011, KF-615A, KF-945A (all manufactured by Shin-Etsu Chemical Co., Ltd.), the TSF451 series, the SILSOFT series, SF3802A (all manufactured by Momentive Corporation), the DOWSIL SH200 series, DOWSIL BY11-007, DOWSIL BY11-026, DOWSIL BY25-320, XIAMETER 1503Fluid, DOWSIL SS-2804, DOWSIL FZ-2222, DOWSIL FZ-2250 (all manufactured by Dow Corning Toray Co., Ltd.), and the like.

[0070] The component (D) may be in the form of a silicone emulsion, such as, but not limited to, trade names such as DOWSIL BY22-068, DOWSIL BY22-080, DOWSIL BY22-034, DOWSIL BY22-050, and DOWSIL BY22-060 (all manufactured by Dow Corning Toray Co., Ltd.).

[0071] The content of at least one selected from dimethicone and dimethiconol in the (D) component is not particularly limited and can be appropriately selected depending on the purpose, but from the viewpoint of the moist feeling of the skin after towel drying and the durability of the dry feeling of the skin after towel drying, it is preferably 0.01% by mass to 0.5% by mass, and more preferably 0.02% by mass to 0.4% by mass, based on the total amount of the liquid skin cleanser composition. When the content of the (D) component is 0.01% by mass or more, the durability of the moist feeling of the skin after towel drying and the dry feeling of the skin after towel drying is good, and when it is 0.5% by mass or less, the skin after towel drying is not sticky.

[0072] <Other ingredients> In addition to the components (A), (B), (C), and (D), the liquid skin cleanser composition of the present invention may contain other components that are typically used in liquid skin cleanser compositions, as necessary, within the scope of the present invention.

[0073] The other components are not particularly limited and can be appropriately selected depending on the purpose. Examples of the other components include surfactants other than the component (A) and the component (C), water-soluble polymers other than the component (B), oils, silicones other than the component (D), alcohols, lanolin derivatives, protein derivatives, amino acids, vitamins and other drugs, bactericides, preservatives, pH adjusters, antioxidants, sequestering agents, animal and plant extracts or derivatives thereof, chelating agents, moisturizers, thickeners, ultraviolet absorbing agents or scattering agents, colorants, fragrances, pigments, water-insoluble polymer compound powders, and the like.

[0074] The oil is not particularly limited and can be appropriately selected depending on the purpose. Examples of the oil include vegetable oils and fats such as castor oil, olive oil, cacao oil, hardened palm oil, camellia oil, coconut oil, wood wax, jojoba oil, grapeseed oil, and avocado oil, and ester compounds thereof; 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 alone or in combination of two or more.

[0075] The alcohol is not particularly limited and can be appropriately selected according to the purpose, and may be a lower alcohol or a higher alcohol.Specific examples of the alcohol include natural and synthetic higher alcohols such as cetyl alcohol, oleyl alcohol, stearyl alcohol, hexyl decanol, octyl dodecanol, and lauryl alcohol.These may be used alone or in combination of two or more.

[0076] The moisturizing agent is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include isoprene glycol, 1,2-pentanediol, diethylene glycol, diethylene glycol monoalkyl ether, polypropylene 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.

[0077] The thickener is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include natural polymers such as sodium alginate, xanthan gum, aluminum silicate, quince seed extract, tragacanth gum, and starch, semi-synthetic polymers such as methylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, carboxymethylcellulose, and soluble starch, and synthetic polymer compounds such as carboxyvinyl polymer, polyvinyl alcohol, polyvinylpyrrolidone, polyacrylic acid, and methacryloylethylbetaine-methacrylic acid ester copolymer. These may be used alone or in combination of two or more.

[0078] The preservative is not particularly limited and may be appropriately selected depending on the purpose, and examples thereof include benzoates, sorbates, dehydroacetates, paraoxybenzoates, 2,4,4'-trichloro-2'-hydroxydiphenyl ether, 3,4,4'-trichlorocarbanilide, benzalkonium chloride, hinokitiol, resorcin, methylchloroisothiazolinone-methylisothiazolinone solution (product name: Cason CG, manufactured by Rohm and Haas Japan Co., Ltd.), salicylic acid, pentanediol, phenoxyethanol, ethanol, etc. These may be used alone or in combination of two or more.

[0079] The antioxidant is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include dibutylhydroxytoluene, butylhydroxyanisole, ascorbic acid, etc. These may be used alone or in combination of two or more kinds.

[0080] The chelating agent is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include edetic acid, edetate disodium, ethylenediaminetetraacetate, hexametaphosphate, gluconic acid, etc. These may be used alone or in combination of two or more.

[0081] The pH adjuster is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include sodium hydroxide, potassium hydroxide, citric acid, succinic acid, triethanolamine, aqueous ammonia, triisopropanolamine, phosphoric acid, glycolic acid, hydrochloric acid, etc. These may be used alone or in combination of two or more.

[0082] The ultraviolet absorbing agent or scattering agent is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include 2-hydroxy-4-methoxybenzophenone, octyl dimethyl paraaminobenzoate, ethylhexyl paramethoxycyanamate, titanium oxide, kaolin, talc, etc. These may be used alone or in combination of two or more.

[0083] The vitamins are not particularly limited and can be appropriately selected depending on the purpose, and examples thereof 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, etc. These may be used alone or in combination of two or more kinds.

[0084] The amino acids are not particularly limited and can be appropriately selected depending on the purpose, and examples thereof 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 water-insoluble polymer compound powder is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include inorganic powder, clay mineral, nylon, polyethylene, etc. These may be used alone or in combination of two or more kinds.

[0086] The other components may be appropriately synthesized or commercially available products. The content of the other components relative to the total amount of the liquid skin cleansing composition is not particularly limited and may be appropriately selected depending on the purpose.

[0087] -pH- The pH of the liquid skin cleansing composition at 25° C. is not particularly limited and may be appropriately selected depending on the purpose, but is preferably 9.5 to 11.0, more preferably 9.8 to 10.6. The pH can be measured, for example, using a glass electrode color hydrogen ion concentration indicator HM-30R (manufactured by TOA DKK, electrode type GST-5721).

[0088] -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, 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 each of a 305 mesh and a 200 mesh porous membrane body, 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, by 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, and after 1 minute using a No. 1 rotor.

[0089] -container- The liquid skin cleansing composition of the present invention is not particularly limited, and is filled into a conventional container for use. The container is not particularly limited and may be appropriately selected depending on the purpose, and examples thereof include a pump dispenser container, a tube, a former container, a bag-shaped container, etc. Among these, a former container is preferable.

[0090] The foamer container is not particularly limited and can be appropriately selected from known foamer containers, for example, a non-gas type foamer container, an aerosol container using a propellant and a pressure-resistant container, etc. Among these, a non-gas type foamer container is preferred.

[0091] The non-gas type foam-discharging container is not particularly limited as long as it can mix the liquid skin cleanser composition with air and discharge it in a foamed state, and can be appropriately selected according to the purpose. For example, a squeeze foamer container that can discharge foam by squeezing the bottle body by hand, a pump foamer container that can discharge foam by pushing down the nozzle, etc. can be mentioned. Such a foamer container can be manufactured by Yamato Can Co., Ltd., Yoshino Kogyosho Co., Ltd., etc. More specifically, the foamer container can be described in JP-A-7-315463, JP-A-8-230961, and JP-A-2005-193972, etc.

[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, polyolefin, etc.) for forming foam, and foam is formed by the liquid skin cleansing composition passing 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 to 400 mesh, and particularly preferably 200 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 sheets are preferable.

[0094] -Manufacturing method- The method for producing the liquid skin cleanser composition is not particularly limited and may be appropriately selected depending on the purpose. For example, the liquid skin cleanser composition may be obtained by mixing the component (A), the component (B), the component (C), and the component (D), and further, as necessary, the other components, and purified water (blended as the balance so that the entire liquid skin cleanser composition becomes 100% by mass). Specifically, the silicone emulsion can be produced by dissolving the component (A) in purified water heated to 70°C to 80°C, cooling to 40°C or less, and then adding the silicone emulsion containing the component (B) and the components (C) and (D). The silicone emulsion is produced by mixing the component (D) while heating to 70°C. The component (C) is also mixed with purified water separately while heating to 70°C to dissolve it. The mixture containing the component (C) is added to the mixture containing the component (D), and the mixture is cooled to 30°C to obtain the silicone emulsion.

[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 a shearing force and can mix the entire composition. The stirring blade is not particularly limited and can be appropriately selected depending on the purpose. Examples of the stirring blade include a propeller, a turbine, and a disperser.

[0096] -Applications- The area where the liquid skin cleansing composition is applied is not particularly limited and can be appropriately selected depending on the purpose. For example, the liquid skin cleansing composition can be applied to the whole body, face, hands, etc. The method of using the liquid skin cleansing composition is not particularly limited and may be appropriately selected depending on the purpose, but it is preferable to fill the composition in a foamer container and discharge it in the form of a foam.

[0097] The liquid skin cleanser composition has excellent foam retention and satisfactorily satisfies all of the requirements of moisturizing the skin after towel drying, non-stickiness of the skin after towel drying, and sustained dryness of the skin after towel drying, and 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, and is particularly suitable for use in body soaps. EXAMPLES

[0098] The present invention will be specifically described 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 shown in "mass %", the total amount is 100 mass %, and all values ​​are calculated as pure contents. The mass ratio of the total content (mass %) of components (B) and (C) to the content (mass %) of component (A) [(B) + (C) / (A)] was rounded off to the fourth decimal place and calculated to the third decimal place.

[0100] (Examples 1 to 33 and Comparative Examples 1 to 11) Liquid skin cleansing compositions having the compositions and contents shown in Tables 1 to 7 below were prepared according to the following method. Component (D) or a comparative component of component (D) was mixed with the common components polyoxyethylene (POE) (20) cetyl ether and propylene glycol while heating to 70°C to obtain mixture 1. Component (C) was also mixed with purified water while heating to 70°C to dissolve, to obtain mixture 2. Mixture 2 was added to mixture 1 and mixed with a homomixer, and then cooled to 30°C while stirring to prepare a silicone emulsion. Purified water in an amount equivalent to 45% by mass of the amount required for the final liquid skin cleansing composition was heated to 70°C to 80°C, component (A) was added and dissolved therein, and the temperature was cooled to 40°C or lower, after which component (B) and the silicone emulsion were added. If the pH did not reach the predetermined pH (pH 10.0), potassium hydroxide, a common component, was added to adjust the pH to 10.0, followed by addition of lauric acid amidopropyl betaine and a fragrance, and then adding purified water until the total amount reached 100% by mass, to obtain the liquid skin cleansing compositions of Examples 1 to 33 and Comparative Examples 1 to 11. When preparing each of the liquid skin cleansing compositions, a propeller was used as the stirring blade, and stirring was performed 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 Corporation). The obtained liquid skin cleansing compositions of Examples 1 to 33 and Comparative Examples 1 to 11 were each filled into a container equipped with a foamer pump dispenser [discharge volume 3 mL, manufactured by Yoshino Kogyosho Co., Ltd.] and used in the following evaluations.

[0101] The liquid skin cleansing compositions of Examples 1 to 33 and Comparative Examples 1 to 11 were evaluated and judged for "foam retention," "moist feeling of skin after towel drying," "non-stickiness of skin after towel drying," and "sustainability of dry feeling of skin after towel drying" as follows. The results are shown in Tables 1 to 7 below.

[0102] <Foam retention> Ten expert evaluators applied 5 pumps (about 15 g) of each of the liquid skin cleansing compositions of Examples 1 to 33 and Comparative Examples 1 to 11 onto the palm of their hands, washed the whole body with their hands, and then observed the "foam retention" and evaluated it based on the following evaluation criteria. The results were calculated by calculating the average score of the 10 expert evaluators, and judged based on the following judgment criteria for the average score. -Evaluation criteria for "foam retention"- 4 points: By the time you finish washing your body, most of the foam you applied at the beginning of the wash is still there. 3 points: By the time you finish washing your body, about 80% to 50% of the foam you applied at the beginning of the wash remains. 2 points: By the time you finish washing your body, about 20% to 40% of the foam you applied at the beginning of the wash remains. 1 point: By the time you finish washing your body, there is almost no foam left on your body that you applied at the beginning of the wash. -Criteria for determining "foam retention"- ◎: Average score is between 3.5 and 4.0 points ○: Average score is between 3.0 and 3.5 points △: Average score is between 2.0 and 3.0 points ×: Average score is less than 2.0 points

[0103] <Moisturized skin after towel drying> Ten expert evaluators took 5 pumps (about 15 g) of each of the liquid skin cleansing compositions of Examples 1 to 33 and Comparative Examples 1 to 11 into their hands, washed the whole body with their hands, rinsed with warm water at 40°C, and towel-dried. After that, they were allowed to rest for 30 minutes in a thermostatic room at 38°C, and evaluated the "moist feeling of skin after towel-drying" based on the following evaluation criteria. The results were calculated by calculating the average score of the 10 expert evaluators, and judged based on the following criteria for judging the average score. -Evaluation criteria for "moisturizing skin after towel drying"- 4 points: Strong feeling of moisture 3 points: Feels moist 2 points: Slightly moist feeling 1 point: No moist feeling - Criteria for judging "skin moisturizing after towel drying" - ◎: Average score is between 3.5 and 4.0 points ○: Average score is between 3.0 and 3.5 points △: Average score is between 2.0 and 3.0 points ×: Average score is less than 2.0 points

[0104] <No stickiness after towel drying> Ten expert evaluators took 5 pumps (about 15 g) of each of the liquid skin cleansing compositions of Examples 1 to 33 and Comparative Examples 1 to 11 into their hands, washed the whole body with their hands, rinsed with warm water at 40°C, and towel-dried. After that, they were allowed to rest for 30 minutes in a thermostatic room at 38°C, and then evaluated "non-stickiness of skin after towel-drying" based on the following evaluation criteria. The results were calculated by calculating the average score of the 10 expert evaluators, and judged based on the following criteria for judging the average score. -Evaluation criteria for "non-sticky skin after towel drying"- 4 points: No stickiness at all 3 points: Feels slightly sticky 2 points: Feels quite sticky 1 point: Very sticky - Criteria for judging "non-sticky skin after towel drying" - ◎: Average score is between 3.5 and 4.0 points ○: Average score is between 3.0 and 3.5 points △: Average score is between 2.0 and 3.0 points ×: Average score is less than 2.0 points

[0105] <Maintains smooth skin feeling after towel drying> Ten expert evaluators took 5 pushes (about 15 g) of each of the liquid skin cleansing compositions of Examples 1 to 33 and Comparative Examples 1 to 11 into their hands, washed the whole body with their hands, rinsed with warm water at 40° C., towel-dried, and then rested for 8 hours in a room at 30° C., after which the “durability of the skin's smooth feeling after towel-drying” was evaluated according to the following evaluation criteria. The results were calculated by calculating the average score of the 10 expert evaluators, and judged according to the following criteria for judging the average score. -Evaluation criteria for "sustained dryness of skin after towel drying"- 4 points: Strongly smooth feeling 3 points: Feels smooth 2 points: Somewhat smooth feeling 1 point: No smooth feeling - Criteria for judging "sustained dryness of skin after towel drying" - ◎: Average score is between 3.5 and 4.0 points ○: Average score is between 3.0 and 3.5 points △: Average score is between 2.0 and 3.0 points ×: Average score is less than 2.0 points

[0106] [Table 1]

[0107] [Table 2]

[0108] [Table 3]

[0109] [Table 4]

[0110] [Table 5]

[0111] [Table 6]

[0112] [Table 7]

[0113] Details of each component used in Examples 1 to 33 and Comparative Examples 1 to 11 are shown in Table 8 below.

[0114] [Table 8] *1: Potassium myristate was prepared by neutralizing myristic acid (NAA-142, NOF Corporation) with potassium hydroxide (liquid caustic potash, Asahi Glass Co., Ltd.). *2: Potassium laurate was prepared by neutralizing lauric acid (NAA-122, NOF Corporation) with potassium hydroxide (liquid caustic potash, Asahi Glass Co., Ltd.). *3: Dimethyldiallylammonium chloride-acrylic acid copolymer (Marcoat 550PR, manufactured by Lubrizol Japan Corporation) is a polymeric compound having a structure represented by the following general formula (1), where n is 0, m is 30, and z is 70. *4: Acrylic acid-dimethyldiallylammonium chloride-acrylamide copolymer (Marcoat 3330PR, manufactured by Lubrizol Japan Corporation) is a polymeric compound having a structure represented by the following general formula (1), in which n is 34, m is 31, and z is 35. [ka] In the general formula (1), n, m, and z each represent a molar ratio (mol %) of each structural unit, and n+m=100. [Industrial Applicability]

[0115] The liquid skin cleanser composition can be suitably used in a foamer container, has excellent foam retention, and satisfactorily satisfies all of the requirements of moisturizing the skin after towel drying, non-stickiness of the skin after towel drying, and sustained dryness of the skin after towel drying. Therefore, 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, and the like, and is particularly suitable for use in body soap.

Claims

1. (A) an anionic surfactant; (B) at least one cationic polymer selected from a dimethyldiallylammonium chloride polymer and a dimethyldiallylammonium chloride-acrylic acid copolymer; (C) a long-chain alkyl group-containing quaternary ammonium salt; (D) at least one selected from dimethicone and dimethiconol having a kinematic viscosity at 25°C of 1.5 cSt to 100,000 cSt; Contains The component (A) is a higher fatty acid salt including both a laurate and a myristate, the molar ratio of structural units derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer of the component (B) is 90 mol % or more; The content of the component (A) is 10% by mass to 30% by mass, The content of the (B) component is 0.2% by mass to 1.0% by mass, A liquid skin cleansing composition, wherein a mass ratio of a total content of the component (B) and the component (C) to a content of the component (A), [{(B)+(C)} / (A)], is 0.01 to 0.

08.

2. The content of the (A) component is 10% by mass to 20% by mass, The content of the (B) component is 0.2% by mass to 0.8% by mass, The content of the (C) component is 0.005% by mass to 0.04% by mass, The liquid skin cleansing composition according to claim 1, wherein the content of the component (D) is 0.02% by mass to 0.4% by mass.

3. A liquid skin cleanser composition according to any one of claims 1 to 2, wherein the component (C) is at least one long-chain alkyl group-containing quaternary ammonium salt selected from lauryltrimethylammonium salt, cetyltrimethylammonium salt, stearyltrimethylammonium salt, behenyltrimethylammonium salt, cetyldimethylbenzylammonium salt, stearyldimethylbenzylammonium salt, behenyldimethylbenzylammonium salt, dicetyldimethylammonium salt, distearyldimethylammonium salt, dibehenyldimethylammonium salt, dicetylmethylbenzylammonium salt, distearylmethylbenzylammonium salt, dibehenylmethylbenzylammonium salt, tricetylmethylammonium salt, tristearylmethylammonium salt, and tribehenylmethylammonium salt.

4. A liquid skin cleansing composition described in any one of claims 1 to 3, which is filled into a former container.

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