JP7601504B2 - Liquid skin cleansing composition - Google Patents

Description

The present invention relates to a liquid skin cleansing composition.

Conventionally, liquid skin cleansing compositions such as hand soaps and body soaps are expected to have good foaming performance, such as foam retention, and to provide a moist feeling to the skin after cleansing. In addition, in hot summer climates, there is a demand for liquid skin cleansing compositions that can provide a dry feeling to the skin without making it sticky for a long time after cleansing and have high moisturizing properties.

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 structural units 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.

A liquid skin cleanser composition containing a fatty acid salt, a cationic polymer, an oil, silicone, and a polyhydric alcohol has also been proposed (see, for example, Patent Document 2). However, the proposed liquid skin cleanser composition was not fully satisfactory in terms of moisturizing 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.

Therefore, there is a need for a liquid skin cleansing composition that has excellent foam retention, leaves the skin feeling moisturized after towel drying, is non-sticky after towel drying, and maintains a smooth feeling after towel drying.

JP 2004-262838 A JP 2009-67734 A

The present invention aims to solve the above-mentioned problems of the prior art and to achieve the following objectives. 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.

As a result of intensive research conducted by the present inventors to achieve the above object, the present inventors have found that a liquid skin cleansing composition containing (A) an anionic surfactant, (B) at least one cationic polymer selected from dimethyldiallylammonium chloride polymer and 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, in which the molar ratio of structural units derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer of the (B) component is 40 mol% or more, and the mass ratio [{(B)+(C)}/(A)] of the total content of the (B) component and the (C) component to the content of the (A) component 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.

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 (C) component is 0.005% by mass to 0.04% by mass,
The liquid skin cleanser composition according to <1>, wherein the content of the component (D) is 0.02% by mass to 0.4% by mass.
<3> The liquid skin cleansing composition according to any one of <1> to <2>, which is filled in a former container.

The present invention can solve the above-mentioned problems of the prior art and achieve the above-mentioned objective, and can provide a liquid skin cleansing composition that has excellent foam retention, leaves the skin feeling moist after towel drying, is non-sticky after towel drying, and maintains a smooth feeling after towel drying.

(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.

<(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.

The anionic surfactant of component (A) is not particularly limited and may be appropriately selected depending on the purpose. Examples 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 standpoint of foam retention, moist feeling of skin after towel drying, and sustained dry feeling of skin after towel drying.

- 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.

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.

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.).

The higher fatty acid salt can be blended as a higher fatty acid salt, but the higher fatty acid and the counter ion salt, such as potassium hydroxide, can also be added separately to a blending tank and neutralized to form the higher fatty acid salt.

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).

The content of the laurate salt is not particularly limited and can be selected appropriately 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.

The content of the myristate salt is not particularly limited and can be selected appropriately 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 cleanser composition.

The content of the palmitate is not particularly limited and can be selected appropriately 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.

The content of the stearate salt is not particularly limited and can be selected appropriately 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 cleanser composition.

-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.

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

In the general formula (A1), n represents the average number of moles of ethylene oxide (E.O.) added, and the average number of moles of ethylene oxide added is preferably 1 to 5.

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.

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 numbers in the parentheses indicate the average number of moles (n) of ethylene oxide (E.O.) added.

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, by trade name, 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).

-Ether carboxylate-
The ether carboxylate 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 (A2) or (A3). The ether carboxylate may be used alone or in combination of two or more kinds.

In the general formulae (A2) and (A3), ^R8 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. The number of carbon atoms in the ^R8 moiety is preferably 10 to 14.

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

In the general formula (A2), o represents the average number of moles of alkylene oxide added, which is 1 to 20, and the average number of moles of alkylene oxide added is preferably 1 to 5.

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

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.

The ether carboxylate may be an appropriately synthesized product or a commercially available product.
Examples of commercially available ether carboxylates include, by trade name, ENERGICOLE EC-30 (manufactured by Lion Specialty Chemicals Co., Ltd., polyoxyethylene (3) lauryl ether sodium acetate), VIEWRITE LCA-25F (polyoxyethylene (3) lauryl ether sodium acetate), VIEWRITE LCA-30D (polyoxyethylene (3) lauryl ether sodium acetate), VIEWRITE LCA-H (polyoxyethylene (4) lauryl ether acetic acid), VIEWRITE LCA-25NH (laureth-4 carboxylic acid), VIEWRITE SHAA (sodium lauryl glycol carboxylate), VIEWRITE 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.

- Amino acid-based surfactants -
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.

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. The number of carbon atoms in the R ¹⁰ portion is preferably 8 to 18.

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

In the general formula (A4), R ¹² and R ¹³ may be the same or different and each represents a hydrogen atom or —(CH ₂ ) _m ^—COOM2 .

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

In the general formula (A4), M ¹ and M ² may be the same or different and each represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium, or a basic amino acid.

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.

Specific examples of amino acid surfactants represented by the general formula (A4) include N-acyl-glycine and its salts, such as N-cocoyl-glycine potassium (N-coconut fatty acid acylglycine potassium); N-acyl-N-carboxyethyl-glycine and its salts, such as N-myristoyl-N-carboxyethyl-glycine sodium; N-acylglutamic acid and its salts, 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.

The amino acid-based surfactant may be appropriately synthesized or may be a commercially available product.
Commercially available amino acid surfactants include, for example, trade names such as 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) 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-sodium glutamate), Amisoft (registered trademark) HS-11P (N-stearoyl-L-sodium glutamate), Amisoft (registered trademark) HS-11P(F) (N-stearoyl-L-sodium glutamate), Amisoft (registered trademark) HS21 (N-stearoyl-L-disodium glutamate), Amirite (registered trademark) ACS-12 (sodium cocoyl alanine) (all manufactured by Ajinomoto Healthy Supply Co., Ltd.), Aminosurfact (registered trademark) AMMS-P1 (N-myristoyl-L-sodium glutamate) (manufactured by Asahi Kasei Chemicals Corporation), NIKKOL Examples of the active ingredient include Sarcosinate MN (sodium myristoyl methylaminoacetate), NIKKOL Alaninate LN-30 (sodium lauroyl methyl-β-alanine) (all manufactured by Nikko Chemicals Co., Ltd.), Alanone ACE (sodium coconut oil fatty acid methylalanine), Alanone AME (sodium myristoyl methyl-β-alanine), Alanone 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).

The content of the anionic surfactant in the component (A) is not particularly limited and may be appropriately selected depending on the purpose, but from the viewpoints of foam retention and moist feeling of the skin after towel drying, it is preferably 8% to 30% by mass, and more preferably 10% 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, 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.

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

The dimethyldiallylammonium chloride-acrylic acid copolymer in the component (B) is represented by the following general formula (B1).
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.

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 on skin after towel drying.
The dimethyldiallylammonium chloride-acrylic acid copolymer may be used alone or in combination of two or more kinds.

The molar ratio of each structural unit in the dimethyldiallylammonium chloride-acrylic acid copolymer in the component (B) can be determined by measuring by nuclear magnetic resonance (NMR) under the following measurement conditions.
[Measurement conditions]
Solvent: heavy water ( _D2O )
Measuring instrument: JNM-LA300 (300MHz, manufactured by JEOL Ltd.)

The weight average molecular weight of the cationic polymer of the component (B) is not particularly limited and may be appropriately selected depending on the purpose. From the viewpoint of moist feeling of the skin after towel drying, however, 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).

The viscosity of a solution of the cationic polymer (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).

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

MERQUAT 100 (component name: dimethyldiallylammonium chloride polymer, manufactured by Lubrizol Japan, solid content 39% by mass 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.

Mercoat 106 (component name: dimethyldiallylammonium chloride polymer, manufactured by Lubrizol Japan, solid content 30% by mass 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 rpm.

Mercoat 280 (component name: dimethyldiallylammonium chloride-acrylic acid copolymer, manufactured by Lubrizol Nippon 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. and a rotor with spindle No. 4 at 60 rpm.

Mercoat 295 (component name: dimethyldiallylammonium chloride-acrylic acid copolymer, manufactured by Lubrizol Nippon 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 in the general formula (1) = 5:95 (molar ratio), 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 rpm.

Among these, the cationic polymers of component (B) are preferably Marcoat 100, Marcoat 280, and Marcoat 295 in terms of foam retention and moisturizing feeling on the skin after towel drying.

The content of the cationic polymer in 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 content of the (B) component 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.

<(C) Long-Chain Alkyl-Containing Quaternary Ammonium Salt>
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.

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

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

Specific examples of the long-chain alkyl group-containing quaternary ammonium salt having one long-chain alkyl group among 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 among the component (C) include tricetylmethylammonium salt, tristearylmethylammonium salt, tribehenylmethylammonium salt, and the like.
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.

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, under the 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 trimethylammonium chloride, manufactured by Toho Chemical Industry Co., Ltd.), CATION AB-250AQ (stearyl trimethylammonium chloride, manufactured by NOF Corporation), Lipocard C-50 (coconut alkyl trimethylammonium chloride), Lipocard T-28 (alkyl (C _16-18 ) trimethylammonium chloride), Lipocard T-30 (alkyl (C _14-18 ) trimethylammonium chloride), Lipocard T-50 (alkyl (C _14-18 ) trimethylammonium chloride), Lipocard T-800 (alkyl (C _16-18 ) trimethylammonium chloride), Lipocard 16-29 (cetyl trimethylammonium chloride), Lipocard 16-50E (cetyl trimethylammonium chloride), Lipocard 18-63 (alkyl (C _16-18 ) trimethylammonium), Lipocard 22-80 (behenyltrimethylammonium chloride), Lipocard CB-50 (alkyl(C _8-18 ) dimethylbenzylammonium chloride) (all manufactured by Lion Specialty Chemicals Co., Ltd.).

The content of the long-chain alkyl group-containing quaternary ammonium salt in component (C) is not particularly limited and may be appropriately selected depending on the purpose, but from the viewpoints 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% to 0.05% by mass, and more preferably 0.005% to 0.04% by mass, based on the total amount of the liquid skin cleanser composition. When the content of 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.

<Mass ratio [{(B)+(C)}/(A)]>
The mass ratio of the total content (mass%) of the (B) component and the (C) component to the content (mass%) of the (A) component [{(B)+(C)}/(A ) is from 0.005 to 0.08, preferably from 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 moist feeling of the skin after towel drying and the dry feeling of the skin after towel drying will not last long enough. If the value exceeds 0.08, the skin will not feel sticky enough after towel drying.

<(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.

Examples of dimethicone in the component (D) include those represented by the following general formula (D1).
In the above general formula (D1), a represents the molar ratio (mol %) of the structural unit and is from 3 to 20,000.

The kinetic viscosity at 25°C of at least one selected from dimethicone and dimethiconol of the 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 is prepared, and the specific viscosity η _sp (25°C) is calculated by the following formula (1). Next, the specific viscosity is substituted into the Huggins relational equation shown in the following formula (2) to calculate the intrinsic viscosity [η]. 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. U.S.S.R. 89 65. 1953) to calculate the molecular weight M. Finally, M is calculated by the formula of A. J. The kinetic viscosity η of dimethicone can be calculated by substituting the above into Barry's equation (see J. Appl. physics. 17. 1020. 1946).
η _sp = (η/η ₀ )-1... Formula (1)
η _sp = [η] + K' [η]2 ... Formula (2)
[η]=2.15×10 ⁻⁴ M ^0.65 ... Formula (3)
logη=1.00+0.0123M ^0.5 ... Formula (4)
In the formula (1), "η ₀ " represents the viscosity of toluene, and "η" represents the viscosity of the solution. The "η ₀ " and "η" are measured in accordance with the Viscosity Measurement Method 1 of the General Testing Methods of the Cosmetic Raw Materials Standards.

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, KF-96L series, KF-96A series, KF-6011, KF-615A, KF-945A (all manufactured by Shin-Etsu Chemical Co., Ltd.), TSF451 series, SILSOFT series, SF3802A (all manufactured by Momentive Corporation), 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.

The component (D) may be a silicone emulsion. Examples of silicone emulsions include, but are 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.).

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% to 0.5% by mass, and more preferably 0.02% 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 moist feeling of the skin after towel drying and the durability of the dry feeling of the skin after towel drying are good, and when it is 0.5% by mass or less, the skin after towel drying is not sticky.

<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.

The other components are not particularly limited and may be appropriately selected depending on the purpose. Examples of the other components include surfactants other than the components (A) and (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, metal sequestering agents, animal and plant extracts or derivatives thereof, chelating agents, moisturizing agents, thickeners, ultraviolet absorbing agents or scattering agents, dyes, fragrances, pigments, water-insoluble polymer compound powders, etc.

The oils are not particularly limited and can be selected appropriately depending on the purpose. Examples of the oils 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 their ester compounds; animal oils and fats such as mink oil and egg yolk oil; waxes such as beeswax, whale wax, lanolin, hydrogenated lanolin, carnauba wax, and candelilla wax; hydrocarbons such as liquid paraffin, squalane, microcrystalline wax, ceresin wax, paraffin wax, and petrolatum; natural and synthetic fatty acids such as oleic acid, isostearic acid, and behenic acid; and esters such as glycerol tri-2-ethylhexanoate, 2-ethylhexyl stearate, butyl stearate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, octyldodecyl oleate, and cholesterol oleate. These may be used alone or in combination of two or more.

The alcohols are not particularly limited and may be appropriately selected depending on the purpose, and may be lower alcohols or higher alcohols. Specific examples of the alcohols include natural and synthetic higher alcohols such as cetyl alcohol, oleyl alcohol, stearyl alcohol, hexyldecanol, octyldodecanol, and lauryl alcohol. These may be used alone or in combination of two or more.

The moisturizer is not particularly limited and can be appropriately selected depending on the purpose. Examples 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.

The thickener is not particularly limited and may be appropriately selected depending on the purpose. Examples of the thickener 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 copolymers. These may be used alone or in combination of two or more.

The preservative is not particularly limited and can be appropriately selected depending on the purpose. Examples of the preservative include benzoates, sorbates, dehydroacetates, paraoxybenzoic acid esters, 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), salicylic acid, pentanediol, phenoxyethanol, and ethanol. These may be used alone or in combination of two or more.

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

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

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

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

The vitamins are not particularly limited and can be appropriately selected depending on the purpose. Examples include vitamin A, vitamin B group, 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.

The amino acids are not particularly limited and can be appropriately selected depending on the purpose. 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.

The water-insoluble polymer compound powder is not particularly limited and can be appropriately selected depending on the purpose. Examples of the water-insoluble polymer compound powder include inorganic powder, clay mineral, nylon, and polyethylene. These may be used alone or in combination of two or more kinds.

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.

-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 (TOA DKK Corporation, electrode type GST-5721).

-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 to be used, etc., but is preferably 4 mPa·s to 40 mPa·s, more preferably 8 mPa·s to 30 mPa·s.
For example, when using a pump foamer container capable of ejecting 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., a rotation speed of 60 rpm, and a No. 1 rotor to measure the viscosity after 1 minute.

-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.

The foamer container is not particularly limited and can be appropriately selected from known foamer containers, examples of which include non-gas type foamer containers and aerosol containers using a propellant and a pressure-resistant container. Among these, non-gas type foamer containers are preferred.

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 depending on the purpose. For example, squeeze foamer containers that can discharge foam by squeezing the bottle body by hand, and pump foamer containers that can discharge foam by pushing down the nozzle part can be mentioned. Such foamer containers can be manufactured by Yamato Can Co., Ltd., Yoshino Kogyosho Co., Ltd., etc. More specifically, foamer containers described in JP-A-7-315463, JP-A-8-230961, and JP-A-2005-193972 can be used.

The non-gas type foam dispenser container has a foam-forming member, specifically, a porous membrane (preferably made of a plastic material such as nylon, polyester, or polyolefin) for forming foam, and foam is formed by passing the liquid skin cleanser composition through the porous membrane.

The mesh of the porous membrane is not particularly limited and may 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.

- 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) and purified water are separately mixed while heating to 70°C to dissolve the component. The silicone emulsion can be produced by adding a mixture containing the component (C) to a mixture containing the component (D), and cooling to 30°C.

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.

--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.

The liquid skin cleansing composition has excellent foam retention and satisfactorily satisfies all of the following requirements: moisturizing the skin after towel drying, non-stickiness of the skin after towel drying, and sustained smoothness of the skin after towel drying. Therefore, it can be used, for example, in body shampoos, body soaps, facial cleansers, hand soaps, foaming hand soaps, cleansing foams, makeup removers, and the like, and is particularly suitable for use in body soaps.

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.

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 converted to pure content. In addition, the mass ratio of the content (mass %) of component (A) to the total content (mass %) of components (B) and (C) [(B) + (C) / (A)] was rounded off to the fourth decimal place and calculated to the third decimal place.

(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. Separately, component (C) was mixed with purified water while heating to 70° C. to dissolve, to obtain mixture 2. Mixture 2 was added to mixture 1, 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 cleanser composition was heated to 70° C. to 80° C., component (A) was added and dissolved therein, and the mixture was cooled to 40° C. or less, 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 cleanser 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 Industry Co., Ltd.) The pH was measured at 25° C. using a pH meter (HM-30R, manufactured by TOA DKK Corporation).
Each of the obtained liquid skin cleansing compositions of Examples 1 to 33 and Comparative Examples 1 to 11 was filled into a container equipped with a foamer pump dispenser [discharge volume 3 mL, manufactured by Yoshino Kogyosho Co., Ltd.] and used for the following evaluations.

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

<Foam retention>
Ten expert evaluators applied 5 pumps (approximately 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 their entire bodies 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 criteria for judging 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 remains. 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, almost none of the foam you applied at the beginning of the wash remains. -Foam retention rating criteria-
◎: The average score is between 3.5 and 4.0 points. ○: The average score is between 3.0 and 3.5 points. △: The average score is between 2.0 and 3.0 points. ×: The average score is less than 2.0 points.

<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 "skin moisturization 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 feeling of skin after towel drying" -
4 points: Strong moist feeling 3 points: Moist feeling 2 points: Slight moist feeling 1 point: No moist feeling - Evaluation criteria for "Moist feeling of skin after towel drying" -
◎: The average score is between 3.5 and 4.0 points. ○: The average score is between 3.0 and 3.5 points. △: The average score is between 2.0 and 3.0 points. ×: The average score is less than 2.0 points.

<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 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: Not sticky at all 3 points: Slightly sticky 2 points: Quite sticky 1 point: Extremely sticky
- Criteria for judging "non-sticky skin after towel drying" -
◎: The average score is between 3.5 and 4.0 points. ○: The average score is between 3.0 and 3.5 points. △: The average score is between 2.0 and 3.0 points. ×: The average score is less than 2.0 points.

<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 entire 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 they evaluated "the durability of the dry feeling of the skin after towel-drying" according to the following evaluation criteria. The results were evaluated by calculating the average score of the 10 expert evaluators, and judging according to the following criteria for judging the average score.
- Evaluation criteria for "sustained smooth feeling of skin after towel drying" -
4 points: Strongly smooth feeling 3 points: Slightly smooth feeling 2 points: Slightly smooth feeling 1 point: No smooth feeling - Evaluation criteria for "sustaining smooth feeling of skin after towel drying" -
◎: The average score is between 3.5 and 4.0 points. ○: The average score is between 3.0 and 3.5 points. △: The average score is between 2.0 and 3.0 points. ×: The average score is less than 2.0 points.

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

※１：ミリスチン酸カリウムは、ミリスチン酸（ＮＡＡ－１４２、日油株式会社製）を水酸化カリウム（旭硝子株式会社製、液体苛性カリ）で中和させて調製したものを使用した。
※２：ラウリン酸カリウムは、ラウリン酸（ＮＡＡ－１２２、日油株式会社製）を水酸化カリウム（旭硝子株式会社製、液体苛性カリ）で中和させて調製したものを使用した。
※３：塩化ジメチルジアリルアンモニウム・アクリル酸共重合体（マーコート５５０ＰＲ、日本ルーブリゾール株式会社製）は、下記一般式（１）で表される構造を有する高分子化合物であり、下記一般式（１）中のｎが０であり、ｍが３０であり、ｚが７０である。
※４：アクリル酸・塩化ジメチルジアリルアンモニウム・アクリルアミド共重合体（マーコート３３３０ＰＲ、日本ルーブリゾール株式会社製）は、下記一般式（１）で表される構造を有する高分子化合物であり、下記一般式（１）中のｎが３４であり、ｍが３１であり、ｚが３５である。
ただし、前記一般式（１）中、ｎ、ｍ、及びｚは、各構造単位のモル比率（モル％）を示し、ｎ＋ｍ＝１００である。

*1: Potassium myristate was prepared by neutralizing myristic acid (NAA-142, NOF Corp.) with potassium hydroxide (liquid caustic potash, Asahi Glass Co., Ltd.).
*2: Potassium laurate was prepared by neutralizing lauric acid (NAA-122, NOF Corp.) 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), in which 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.
In the general formula (1), n, m, and z each represent a molar ratio (mol %) of each structural unit, and n+m=100.

The liquid skin cleansing composition can be suitably used in a foamer container, has excellent foam retention, and satisfactorily satisfies all of the following requirements: moisturizing the skin after towel drying, non-stickiness of the skin after towel drying, and sustained smoothness of the skin after towel drying. Therefore, it can be used, for example, in body shampoo, body soap, facial cleanser, hand soap, foam hand soap, cleansing foam, makeup remover, etc., and is particularly suitable for use in body soap.

Claims (4)

(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. 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. The liquid skin cleanser composition according to claim 1, 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. The liquid skin cleansing composition according to any one of claims 1 to 3, which is filled in a former container.