JP7749360B2 - Liquid skin cleanser composition - Google Patents

Description

The present invention relates to a liquid skin cleanser composition.

Conventionally, liquid skin cleansing compositions such as hand soaps and body soaps are desired to have good foaming properties such as foam retention, and to provide a moist feeling to the skin after washing. While the majority of consumers have used liquid body soap impregnated into cleaning implements such as nylon towels or cotton towels to wash their bodies, in recent years there has been an increasing demand for applications in which foam body soap dispensed from a foamer container is impregnated into cleaning implements to wash the body. When dispensed foam body soap is impregnated into cleaning implements to wash the body, the foaming properties ( speed of foaming and foam density) and the moist feeling of the skin after washing have not been fully satisfactory.

For the purpose of imparting a good skin feel (such as moistness and smoothness) after cleansing and good foaming performance, 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 unsatisfactory in terms of the speed of lathering and the density of the foam when lathered using a cleansing tool such as a nylon towel or a cotton towel, the moistness of the skin after towel drying, and the dischargeability from a foamer container.

It is generally known that in order to improve the foam performance ( the speed of foaming and the density of the foam), it is necessary to add more fatty acids such as lauric acid, myristic acid, palmitic acid, and stearic acid. However, increasing the blending ratio of the fatty acids causes problems such as poor discharge from the foamer container and a decrease in the moist feeling on the skin after towel drying.

Therefore, a liquid skin cleanser composition that provides moist feeling on the skin after towel drying, non-stickiness on the skin after towel drying, and excellent dischargeability from a foamer container, as well as quick foaming and dense foam when used for washing with a body wash towel, has not yet been provided, and there is currently a strong demand for its prompt development.

International Publication No. 2019/097950

The present invention aims to solve the above-mentioned problems of the prior art and to achieve the following object: to provide a liquid skin cleanser composition that leaves the skin feeling moisturized after towel drying, is non-sticky after towel drying, is easy to dispense from a foamer container, and foams quickly and densely when used with a body wash towel.

As a result of intensive research into achieving the above-mentioned object, the present inventors have found that a liquid skin cleanser composition of the present invention comprises (A) an anionic surfactant, (B) at least one cationic polymer selected from a dimethyldiallylammonium chloride polymer and a dimethyldiallylammonium chloride-acrylic acid copolymer, and (C) a potassium phosphate salt, wherein the molar ratio of structural units derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer is 40% or more, and the mass ratio of the content of the component (B) to the content of the component (C) [(B)/(C)] is 0.2 or more and 8.0 or less, and when filled into a former container, the liquid skin cleanser composition provides a moist feeling on the skin after towel drying, non-stickiness on the skin after towel drying, and is easy to discharge from the former container, as well as excellent foaming speed and foam density when used for washing with a body wash towel.

The present invention is based on the above findings of the present inventors, and the means for solving the above problems are as follows.
<1> A liquid skin cleanser 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; and (C) a potassium phosphate salt; wherein the dimethyldiallylammonium chloride-acrylic acid copolymer has a molar ratio of structural units derived from dimethyldiallylammonium chloride of 40% or more; and the mass ratio of the content of the component (B) to the content of the component (C) [(B)/(C)] is 0.2 or more and 8.0 or less; and wherein the composition is filled in a former container.
<2> The liquid skin cleanser composition according to <1>, wherein the content of the component (A) is from 10% by mass to 25% by mass, the content of the component (B) is from 0.2% by mass to 0.8% by mass, and the content of the component (C) is from 0.1% by mass to 1.0% by mass, based on the total amount of the liquid skin cleanser composition.
<3> The liquid skin cleanser composition according to any one of <1> and <2>, wherein the (C) potassium phosphate salt is at least one selected from potassium dihydrogen phosphate, dipotassium hydrogen phosphate, potassium tripolyphosphate, and potassium polyphosphate.
<4> The liquid skin cleanser composition according to any one of <1> to <3>, wherein the viscosity at 25°C is 5 mPa·s or more and 30 mPa·s or less.

The present invention can solve the above-mentioned conventional problems and achieve the above-mentioned object, thereby providing a liquid skin cleanser composition that leaves the skin feeling moisturized after towel drying, is non-sticky after towel drying, is easy to discharge from a foamer container, and foams quickly and densely when used for washing with a body wash towel.

(Liquid skin cleanser 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, and (C) a potassium phosphate salt, and may further contain other components as necessary.
In this specification, (A) anionic surfactant may be referred to as "component (A)", (B) at least one cationic polymer selected from dimethyldiallylammonium chloride polymer and dimethyldiallylammonium chloride-acrylic acid copolymer may be referred to as "component (B)" or "cationic polymer (B)", and (C) potassium phosphate may be referred to as "component (C)".

<(A) Anionic Surfactant>
The anionic surfactant (A) is contained to improve the speed of lathering and the density of the lather when washing with the body wash towel.
In this specification, the " speed of foaming when washing with a body wash towel" may be referred to as " speed of foaming," and the "thickness of foam when washing with a body wash towel" may be referred to as "thickness of foam."

The anionic surfactant of the component (A) is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include higher fatty acid salts, polyoxyethylene (POE) alkyl ether sulfates, ether carboxylates, amino acid surfactants, etc. Among these, higher fatty acid salts are preferred from the viewpoint of improving the speed of foaming and the density of the foam.
These may be used alone or in combination of two or more.

- Higher fatty acid salts -
The higher fatty acid salt is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include laurate, myristate, palmitate, stearate, etc. Among these, from the viewpoint of improving the speed of foaming and the density of foam, higher fatty acid salts containing all of laurate, myristate, palmitate, and stearate are preferred.
These may be used alone or in combination of two or more.

The salt in the higher fatty acid salt is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof 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 thereof include sodium salts and potassium salts.
The amine salt is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include ammonium salts, monoethanolamine salts, diethanolamine salts, triethanolamine salts, and alkanolamine salts such as 2-amino-2-methylpropanol and 2-amino-2-methylpropanediol.
The amino acid salt is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include lysine salt and arginine salt.
Among these, alkali metal salts are preferred, and potassium salts are more preferred.

The higher fatty acid salt may be suitably synthesized or may be a commercially available product.
The method for synthesizing the higher fatty acid salt is not particularly limited and can be appropriately selected depending on the purpose. For example, a fatty acid salt obtained by a conventional method may be blended as is, or the higher fatty acid salt may be synthesized by neutralizing a higher fatty acid with an alkali such as potassium hydroxide in a blending tank during the blending process of the liquid skin cleanser composition.

Commercially available higher fatty acid salts include, for example, NIKKOL potassium laurate LK-120 (potassium laurate), NIKKOL potassium myristate MK-140 (potassium myristate), and TYSORP MNK-40 (potassium coconut oil fatty acid) (all manufactured by Nikko Chemicals Co., Ltd.), Nonsal PK-1 (potassium palmitate), and Nonsal SK-1 (potassium stearate) (all manufactured by NOF Corporation).

-Polyoxyethylene (POE) alkyl ether sulfate-
The polyoxyethylene alkyl ether sulfate is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include compounds represented by the following general formula (A1).
The polyoxyethylene alkyl ether sulfates may be used alone or in combination of two or more.

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 (EO) 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 thereof include sodium and potassium.

Specific examples of the polyoxyethylene alkyl ether sulfates include polyoxyethylene (1) lauryl ether sodium sulfate, polyoxyethylene (2) lauryl ether sodium sulfate (also known as POE (2) sodium laureth sulfate), polyoxyethylene (3) lauryl ether sodium sulfate (also known as POE (3) sodium laureth sulfate), polyoxyethylene (4) lauryl ether sodium sulfate, polyoxyethylene (5) lauryl ether sodium sulfate, polyoxyethylene (3) alkyl (C12,13) ether sodium sulfate, polyoxyethylene (2) lauryl ether ammonium sulfate, and polyoxyethylene (3) lauryl ether ammonium sulfate.
The numbers in the parentheses indicate the average number of moles (n) of ethylene oxide (E.O.) added.

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

-Ether carboxylate-
The ether carboxylate is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include compounds represented by the following general formula (A2) or (A3).
The ether carboxylates may be used alone or in combination of two or more.

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, and 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 of 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 salt represented by the general formula (A2) or (A3) include polyoxyethylene (3) lauryl ether sodium acetate, polyoxyethylene (4) lauryl ether potassium acetate, and sodium lauryl glycol acetate.
The numbers in the parentheses indicate 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, Energicol EC-30 (polyoxyethylene (3) lauryl ether sodium acetate) (manufactured by Lion Specialty Chemicals Co., Ltd.), 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.), Kaoakipo RLM-45NV (polyoxyethylene (4.5) lauryl ether sodium acetate), and Kaoakipo RLM-100NV (polyoxyethylene (10) lauryl ether sodium acetate) (all manufactured by Kao Corporation).
The numbers in the parentheses indicate the average number of moles (o) of alkylene oxide added.

- Amino acid-based surfactants -
The amino acid-based surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include compounds represented by the following general formula (A4).
The amino acid-derived surfactants may be used alone or in combination of two or more.

In the general formula (A4), R ¹⁰ represents a linear or branched alkyl group or alkenyl group having 5 to 23 carbon atoms, or a phenyl group substituted with a linear or branched alkyl group or alkenyl group having 5 to 23 carbon atoms, and the number of carbon atoms in the R ¹⁰ moiety is preferably 8 to 18.
In the 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 represent a hydrogen atom or —(CH ₂ ) _m —COOM ² .
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 represent 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 selected appropriately depending on the purpose, but glycine, glutamic acid, and methylalanine are preferred.

Specific examples of amino acid surfactants represented by general formula (A4) include N-acylglycines and salts thereof, such as N-cocoylglycine potassium (N-cocoylglycine potassium); N-acylN-carboxyethylglycines and salts thereof, such as N-myristoylN-carboxyethylglycine sodium; N-acylglutamic acid and salts thereof, such as N-myristoylL-glutamate sodium, N-myristoylL-glutamate potassium, N-cocoylL-glutamate potassium, N-palmacylL-glutamate sodium, and N-stearoylL-glutamate sodium; and N-lauroylN-methyl-β-alanine potassium.

The amino acid-based surfactant may be suitably 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-cocoylglycine), Amirite (registered trademark) GCK-12K (potassium N-cocoylglycine), Amirite (registered trademark) GCS-12K (sodium N-cocoylglycine), Amirite (registered trademark) GCS-11 (sodium N-cocoylglycine), Amisoft (registered trademark) CS-11 (sodium N-myristoyl-L-glutamate), Amisoft (registered trademark) CS-22 (sodium N-cocoyl-L-glutamate), Amisoft (registered trademark) LS-11 (sodium N-lauro ...CS-22 (sodium N-cocoyl-L-glutamate), Amisoft (registered trademark) CS-22 (sodium N-cocoyl-L-glutamate), Amisoft (registered trademark) CS-22 (sodium N-cocoyl-L-glutamate), Amisoft (registered trademark) CS-22 (s Sodium glutamate), Amisoft® MS-11 (N-myristoyl-L-glutamate), Amisoft® HS-11P (N-stearoyl-L-glutamate), Amisoft® HS-11P(F) (N-stearoyl-L-glutamate), Amisoft® HS21 (N-stearoyl-L-glutamate disodium), Amirite® ACS-12 (cocoyl alanine sodium) (all manufactured by Ajinomoto Healthy Supply Co., Ltd.), AminoSurfact® AMMS-P1 (N-myristoyl-L-glutamate) (manufactured by Asahi Kasei Chemicals Corporation), NIKKOL Examples of such an active ingredient include Sarcosinate MN (sodium myristoylmethylaminoacetate), NIKKOL Alaninate LN-30 (sodium lauroylmethyl-β-alanine) (all manufactured by Nikko Chemicals Co., Ltd.), Alanon ACE (sodium coconut oil fatty acid methylalanine), Alanon AME (sodium myristoylmethyl-β-alanine), Alanon ALE (sodium lauroylmethyl-β-alanine) (all manufactured by Kawaken Fine Chemicals Co., Ltd.), Enerdicol L-30AN (sodium lauroylmethyl-β-alanine) (manufactured by Lion Specialty Chemicals Co., Ltd.), and Softilt AT-L (sodium lauroylmethyl-β-alanine) (manufactured by NOF Corporation).

The total content of the anionic surfactants of the component (A) contained in the liquid skin cleanser composition of the present invention is not particularly limited and can be appropriately selected depending on the purpose. However, from the viewpoint of improving the foaming speed and foam density, as well as improving the dischargeability from a foamer container, the total content is preferably 8% by mass or more and 30% by mass or less, and more preferably 10% by mass or more and 25% by mass or less, of the total amount of the liquid skin cleanser composition.
When the total content of the anionic surfactants of the component (A) is 8% by mass or more, based on the total amount of the liquid skin cleanser composition, a liquid skin cleanser composition having excellent foaming speed and foam density can be obtained.When the total content of the anionic surfactants of the component (A) is 30% by mass or less, based on the total amount of the liquid skin cleanser composition, a liquid skin cleanser composition having excellent dischargeability from a foamer container can be obtained.

<(B) Cationic Polymer>
The cationic polymer (B) is at least one selected from a dimethyldiallylammonium chloride polymer and a dimethyldiallylammonium chloride-acrylic acid copolymer, and can improve the moist feeling on the skin after towel drying.
The component (B) may be used alone or in combination of two or more.
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.
In the general formula (B1), m is 40 or more, and n and m satisfy the following formula (I):
n+m=100...Formula (I)

In the present invention, the molar ratio of structural units derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer is 40 mol % or more. By having the molar ratio of structural units derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer be 40 mol % or more, a liquid skin cleanser composition that provides an excellent moist feeling on the skin after towel drying can be obtained.
Furthermore, the molar ratio of structural units derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer is preferably 65 mol% or more, and more preferably 95 mol% or more, from the viewpoint of improving the moist feeling on the skin after towel drying.
The dimethyldiallylammonium chloride-acrylic acid copolymer may be used alone or in combination of two or more kinds.

The content of the (B) cationic polymer is not particularly limited and can be appropriately selected depending on the purpose. However, from the viewpoint of improving the moist feeling of the skin after towel drying, the content is preferably 0.1% by mass or more and 1% by mass or less, and more preferably 0.2% by mass or more and 0.8% by mass or less, based on the total amount of the liquid skin cleanser composition.
When the content of the component (B) is 0.1% by mass or more relative to the total amount of the liquid skin cleanser composition, a liquid skin cleanser composition that provides an excellent moist feeling on the skin after towel drying can be obtained.When the content of the component (B) is 1% by mass or less relative to the total amount of the liquid skin cleanser composition, a liquid skin cleanser composition that provides an excellent moist feeling on the skin after towel drying can be obtained.

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 (300 MHz, manufactured by JEOL Ltd.)

The weight average molecular weight of the (B) cationic polymer is not particularly limited and can be appropriately selected depending on the purpose. From the viewpoint of moist feeling on the skin after towel drying, the weight average molecular weight is preferably 10,000 to 1,000,000, and more preferably 15,000 to 450,000.
The weight average molecular weight of the (B) cationic polymer 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 (B) cationic polymer having a solids 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 using, for example, a Brookfield viscometer LVF (manufactured by Brookfield).

The cationic polymer (B) may be one that has been appropriately synthesized or a commercially available product.
Commercially available cationic polymers (B) include, for example, MERQUAT 100, MERQUAT 106, MERQUAT 280, and MERQUAT 295 (all manufactured by Lubrizol Corporation).
The composition and physical properties of each commercially available product are shown below.
-Marquardt 100-
Composition (molar ratio) acrylic acid: dimethyldiallylammonium chloride = 0:100
・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) at 25° C. with a spindle No. 3 rotor at 6 revolutions per minute.
-Marquardt 106-
Composition (molar ratio) acrylic acid: dimethyldiallylammonium chloride = 0:100
・Solid content 30% to 36% by mass
Viscosity at 25°C: 20 mPa·s to 65 mPa·s
・Weight average molecular weight 15,000
The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25° C. with a spindle No. 3 rotor at 60 rpm.
-Marquardt 280-
Composition (molar ratio) acrylic acid: dimethyldiallylammonium chloride = 35:65
・Solid content: 39% by mass to 43% by mass
・Viscosity at 25℃: 3,000mPa・s to 6,000mPa・s
・Weight average molecular weight 450,000
The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25° C. with a spindle No. 4 rotor at 30 rpm.
-Marquardt 295-
Composition (molar ratio) acrylic acid: dimethyldiallylammonium chloride = 5:95
・Solid content 35% to 40% by mass
・Viscosity at 25℃: 3,500mPa・s to 9,000mPa・s
・Weight average molecular weight 150,000
The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25° C. with a spindle No. 4 rotor at 30 rpm.

<(C) Potassium Phosphate>
The potassium phosphate salt of component (C) is contained to improve the speed of foaming.

The potassium phosphate salt of component (C) is not particularly limited and can be appropriately selected depending on the purpose, and examples include potassium dihydrogen phosphate, dipotassium hydrogen phosphate, potassium tripolyphosphate, potassium polyphosphate, etc. Among these, potassium dihydrogen phosphate is preferred because it improves the foaming speed .
The component (C) may be used alone or in combination of two or more.

The content of the potassium phosphate salt of the component (C) is preferably from 0.05% by mass to 2.0% by mass, and more preferably from 0.1% by mass to 1.0% by mass, relative to the total amount of the liquid skin cleanser composition, from the viewpoint of improving the foaming speed and improving the moist feeling on the skin after towel drying.
When the content of the component (C) is 0.05% by mass or more relative to the total amount of the liquid skin cleanser composition, a liquid skin cleanser composition with excellent foaming speed can be obtained.When the content of the component (C) is 2.0% by mass or less relative to the total amount of the liquid skin cleanser composition, a liquid skin cleanser composition with good moist feeling on the skin after towel drying can be obtained.

The potassium phosphate salt of the component (C) may be either an appropriately synthesized product or a commercially available product.
The method for synthesizing the potassium phosphate salt of component (C) is not particularly limited and can be appropriately selected depending on the purpose. For example, a method of synthesizing the potassium phosphate salt by neutralizing phosphoric acid with potassium hydroxide or the like can be mentioned.
Commercially available potassium phosphate salts of the component (C) include, for example, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, potassium tripolyphosphate, and potassium polyphosphate (all manufactured by Pacific Chemical Industries Co., Ltd.).
These may be used alone or in combination of two or more.

<Mass ratio [(B)/(C)]>
In the present invention, the mass ratio of the content of the component (B) to the content of the component (C) [(B)/(C)] is 0.2 or more and 8.0 or less.
When the mass ratio [(B)/(C)] of the contents is 0.2 or more, a liquid skin cleanser composition that provides an excellent moist feeling on the skin after towel drying can be obtained.When the mass ratio [(B)/(C)] of the contents is 8.0 or less, a liquid skin cleanser composition that provides an excellent non-sticky feeling on the skin after towel drying and an excellent foaming speed can be obtained.
The mass ratio [(B)/(C)] of the content of the component (B) to the content of the component (C) is preferably 0.4 or more and 4.0 or less, and more preferably 0.4 or more and 1.4 or less, in order to improve the moist feeling on the skin after towel drying, the non-stickiness on the skin after towel drying, and the speed of lathering.

<Other ingredients>
In addition to the component (A), the component (B), and the component (C), the liquid skin cleanser composition of the present invention may contain other components as needed, provided that the effects of the present invention are not impaired.
Examples of the other components include surfactants other than component (A), water-soluble polymers other than component (B), oils, silicones, alcohols such as lower or higher alcohols, lanolin derivatives, protein derivatives, amino acids, medicines such as vitamins, disinfectants, moisturizers, preservatives, pH adjusters such as potassium hydroxide, citric acid, and hydrochloric acid, antioxidants, sequestering agents, UV absorbers, UV scattering agents, animal and plant extracts or derivatives thereof, chelating agents such as edetic acid, colorants, fragrances, pigments, inorganic powders, clay minerals, water-insoluble polymer compound powders such as nylon and polyethylene, and the like.
These may be used alone or in combination of two or more.
The other components may be appropriately synthesized or commercially available.
The content of the other components in the liquid skin cleanser composition is not particularly limited and can be appropriately selected depending on the purpose.

The oil is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include vegetable oils and fats such as castor oil, olive oil, cacao oil, hardened palm oil, camellia oil, coconut oil, Japan 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, spermaceti, lanolin, hydrogenated lanolin, carnauba wax, and candelilla wax; hydrocarbons such as liquid paraffin, squalane, microcrystalline wax, ceresin wax, paraffin wax, and petrolatum; natural and synthetic fatty acids such as oleic acid, isostearic acid, and behenic acid; and esters such as glycerol tri-2-ethylhexanoate, 2-ethylhexyl stearate, butyl stearate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, octyldodecyl oleate, and cholesterol oleate.
The concentration of the oil is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 0.1% or more and 3% or less.

The alcohols are not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include natural and synthetic higher alcohols such as cetyl alcohol, oleyl alcohol, stearyl alcohol, hexyldecanol, octyldodecanol, and lauryl alcohol.
The concentration of the alcohols is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 0.1% or more and 10% or less.

The humectant is not particularly limited and can be selected appropriately depending on the purpose. Examples include isoprene glycol, 1,2-pentanediol, diethylene glycol, diethylene glycol monoalkyl ether, polypropylene glycol, hydrogenated castor oil (30 E.O.), diglycerin, triglycerin, and polyglycerins.

The preservative is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include benzoates, sorbates, dehydroacetates, parahydroxybenzoates, 2,4,4'-trichloro-2'-hydroxydiphenyl ether, 3,4,4'-trichlorocarbanilide, benzalkonium chloride, hinokitiol, resorcinol, methylchloroisothiazolinone-methylisothiazolinone solution (trade name: Cason CG, manufactured by Rohm and Haas Japan), salicylic acid, pentanediol, phenoxyethanol, ethanol, and the like.
The concentration of the preservative is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 0.1% or more and 1% or less.

The antioxidant is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include dibutylhydroxytoluene, butylhydroxyanisole, and ascorbic acid.
The concentration of the antioxidant is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 0.1% or more and 1% or less.

The chelating agent is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include disodium edetate, ethylenediaminetetraacetate, hexametaphosphate, and gluconic acid.
The concentration of the chelating agent is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 0.1% or more and 1% or less.

The pH adjuster is not particularly limited and can be selected appropriately depending on the purpose. Examples include sodium hydroxide, potassium hydroxide, citric acid, succinic acid, triethanolamine, aqueous ammonia, triisopropanolamine, phosphoric acid, glycolic acid, etc.

The ultraviolet absorber and ultraviolet scattering agent are not particularly limited and can be selected appropriately depending on the purpose. Examples include 2-hydroxy-4-methoxybenzophenone, octyl dimethyl para-aminobenzoate, ethylhexyl para-methoxycinnamate, titanium oxide, kaolin, and talc.

The vitamins are not particularly limited and can be appropriately selected depending on the purpose. 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.
The concentration of the vitamins is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 0.001% or more and 0.5% or less.

The amino acids are not particularly limited and can be appropriately selected depending on the purpose. 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.
The concentration of the amino acids is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 0.001% or more and 0.5% or less.

<pH>
The pH of the liquid skin cleanser composition at 25° C. is preferably 9.5 to 11.0, and more preferably 9.8 to 10.6.
The method for measuring the pH is not particularly limited, and examples thereof include a method using a glass electrode color hydrogen ion concentration indicator HM-30R (manufactured by DKK-TOA 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 purpose. However, from the viewpoint of improving foam density and dischargeability from a foamer container, the viscosity is preferably from 5 mPa·s to 30 mPa·s, and more preferably from 15 mPa·s to 25 mPa·s.
The method for measuring the viscosity is not particularly limited, and examples thereof include a method in which the viscosity is measured after 1 minute 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.

<Former container>
The liquid skin cleanser composition of the present invention is filled in a former container and is discharged from the former container in the form of foam.
The foamer container is not particularly limited as long as it can discharge the liquid skin cleanser composition in foam form, and can be appropriately selected depending on the purpose, and examples include a non-gas type foam dispenser, an aerosol container using a propellant and a pressure-resistant container, etc. Among these, a non-gas type foam dispenser is preferred.

-Non-gas foam dispenser-
The non-gas type foam dispenser is not particularly limited as long as it can mix the liquid skin cleanser composition with air and dispense it in a foamed state, and can be appropriately selected depending on the purpose. Examples include a squeeze foamer container that can dispense foam by manually squeezing the bottle body, and a pump foamer container that can dispense foam by pressing down the nozzle.
As the squeeze former container and the pump former container, for example, a former container manufactured by Yamato Seikan Co., Ltd. or a former container manufactured by Yoshino Kogyosho Co., Ltd. can be used. More specifically, former 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 usually has a porous membrane for forming foam, and foam is formed when the liquid skin cleanser composition passes through the porous membrane.
The material of the porous membrane is not particularly limited and can be appropriately selected depending on the purpose, but plastic materials such as nylon, polyester, polyolefin, etc. are preferred.

The mesh of the porous membrane body is not particularly limited and can be appropriately selected depending on the purpose. For example, it is preferably 100 mesh or more, more preferably 100 mesh or more and 400 mesh or less, and even more preferably 200 mesh or more and 305 mesh or less.
The number of porous membrane bodies is not particularly limited and can be appropriately selected depending on the purpose, but from the viewpoint of improving foam performance, it is preferably 2 to 4. More specifically, foamer containers described in JP-A-7-315463, JP-A-8-230961, and JP-A-2005-193972 can be suitably used.
For example, when the liquid skin cleanser composition is used using the pump former container having one 305 mesh porous membrane and one 200 mesh porous membrane, the viscosity of the liquid skin cleanser composition at room temperature of 25°C is preferably 30 mPa·s or less, and more preferably 25 mPa·s or less.

<Manufacturing method>
The method for producing the liquid skin cleanser composition of the present invention is not particularly limited and can be appropriately selected depending on the purpose. The composition can be obtained by mixing the (A), (B), and (C) components, as well as the other components as necessary, and purified water (blended as the remainder so that the total liquid skin cleanser composition becomes 100% by mass).
Specifically, it can be produced as follows: the components (A) and (C) are dissolved in purified water heated to 70 to 80°C, the mixture is cooled to 40°C or less, and then the component (B) is added.

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

<Application>
The area and method of application of the liquid skin cleanser composition are not particularly limited and can be appropriately selected depending on the purpose. For example, the liquid skin cleanser composition can be applied to the whole body, face, hands, etc. in a usual manner.
The use of the liquid skin cleanser composition is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include body shampoo, body soap, facial cleanser, hand soap, foam hand soap cleansing foam, and makeup remover.

The present invention will be explained in more detail below based on examples and comparative examples, but the present invention is not limited to these examples.
The content of each component in the examples and comparative examples is shown in "% by mass" and is a value converted into a pure content.

(Examples 1 to 25 and Comparative Examples 1 to 7)
Liquid skin cleansing compositions having the compositions and contents shown in Tables 1 to 6 below were prepared by the following method.
Purified water in an amount equivalent to 95% by mass of the total amount of the final liquid skin cleanser composition was heated to 70°C to 80°C, and the anionic surfactant (component (A)) and the potassium phosphate salt (component (C)) or the comparative component (component (C)) were dissolved therein. The mixture was then cooled to 40°C or below, and the cationic polymer (component (B)) or the comparative component (component (B)) and other components were added to prepare a liquid skin cleanser composition. If the pH did not reach the predetermined value, potassium hydroxide, a common component, was added to adjust the pH to 10.0, and purified water was added to bring the total amount to 100% by mass, thereby obtaining the liquid skin cleanser compositions of Examples 1 to 25 and Comparative Examples 1 to 7. Agitation was performed using a Three-One Motor (HEIDON BL1200, manufactured by Shinto Chemical Co., Ltd.), and a propeller was used as the stirring blade.
The pH of the resulting liquid skin cleanser compositions of Examples 1 to 25 and Comparative Examples 1 to 7 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 25 and Comparative Examples 1 to 7 were filled into a container equipped with a foamer pump dispenser (discharge volume 3 mL, manufactured by Yoshino Kogyosho Co., Ltd.).

The obtained liquid skin cleanser compositions of Examples 1 to 25 and Comparative Examples 1 to 7 were evaluated and judged for " speed of foaming,""denseness of foam,""moist feeling on skin after towel drying,""non-stickiness on skin after towel drying," and "dischargeability from a foamer container." The results are shown in Tables 1 to 6 below.

<Evaluation of foaming speed >
Ten expert evaluators applied two pumps (approximately 6 g) of the liquid skin cleanser compositions of Examples 1 to 25 and Comparative Examples 1 to 7 contained in foamer containers to a nylon towel (Awastar Soft Body Towel, manufactured by Kikuron Co., Ltd.), observed the speed of foaming while washing the whole body, and evaluated the results based on the following evaluation criteria. The average scores of the 10 expert evaluators were calculated and evaluated based on the following criteria.
[Evaluation criteria for foaming speed ]
4 points: foams very quickly 3 points: foams quickly 2 points: foams somewhat quickly 1 point: does not foam quickly [Evaluation criteria for foaming speed ]
◎: 3.5 points or more and 4.0 points or less ○: 3.0 points or more and less than 3.5 points △: 2.0 points or more and less than 3.0 points ×: Less than 2.0 points

<Evaluation of foam density>
Ten expert evaluators dispensed two pumps (approximately 6 g) of the liquid skin cleanser compositions of Examples 1 to 25 and Comparative Examples 1 to 7 in foamer containers onto a nylon towel (Awastar Soft Body Towel, manufactured by Kikuron Co., Ltd.), washed the whole body, and then took the foam in their hands and observed the feel of the foam bouncing back when pressed together with both hands, as well as the resistance to dripping when the hands were turned upside down, and evaluated the results based on the following evaluation criteria. The average scores of the 10 expert evaluators were calculated and judged based on the following criteria.
[Evaluation criteria for foam density]
4 points: The foam is hard and does not drip even when the hand is turned upside down. 3 points: The foam is somewhat hard and does not drip even when the hand is turned upside down. 2 points: The foam is somewhat soft and drips slightly when the hand is turned upside down. 1 point: The foam is soft and drips when the hand is turned upside down. [Criteria for assessing foam density]
◎: 3.5 points or more and 4.0 points or less ○: 3.0 points or more and less than 3.5 points △: 2.0 points or more and less than 3.0 points ×: Less than 2.0 points

<Evaluation of moist feeling on skin after towel drying>
Ten expert evaluators applied two pumps (approximately 6 g) of the liquid skin cleanser compositions of Examples 1 to 25 and Comparative Examples 1 to 7 contained in former containers to nylon towels (Awastar Soft Body Towel, manufactured by Kikuron Co., Ltd.) and washed the entire body. After rinsing with 40°C warm water and towel drying, the skin was left to rest for 30 minutes in a thermostatic chamber at 38°C, and the "skin moisturizing feeling" was evaluated based on the following evaluation criteria. The average scores of the 10 expert evaluators were calculated and evaluated based on the following evaluation criteria.
[Evaluation criteria for moist feeling on skin after towel drying]
4 points: Very moist feeling 3 points: Moist feeling 2 points: Slightly moist feeling 1 point: Not very moist feeling [Criteria for assessing moist feeling on skin after towel drying]
◎: 3.5 points or more and 4.0 points or less ○: 3.0 points or more and less than 3.5 points △: 2.0 points or more and less than 3.0 points ×: Less than 2.0 points

<Evaluation of non-stickiness of skin after towel drying>
Ten expert evaluators applied two pumps (approximately 6 g) of the liquid skin cleanser compositions of Examples 1 to 25 and Comparative Examples 1 to 7 contained in former containers to nylon towels (Awastar Soft Body Towel, manufactured by Kikuron Co., Ltd.) and washed the entire body. The towels were then rinsed with warm water at 40°C, towel-dried, and allowed to rest in a thermostatic chamber at 38°C for 30 minutes, after which the "non-stickiness of the skin" was evaluated based on the following evaluation criteria. The average scores of the 10 expert evaluators were calculated and evaluated based on the following criteria.
[Evaluation criteria for non-stickiness on skin after towel drying]
4 points: No stickiness felt 3 points: Slight stickiness felt 2 points: Stickiness felt 1 point: Very sticky felt [Criteria for assessing the lack of stickiness on the skin after towel drying]
◎: 3.5 points or more and 4.0 points or less ○: 3.0 points or more and less than 3.5 points △: 2.0 points or more and less than 3.0 points ×: Less than 2.0 points

<Evaluation of dischargeability from former container>
The liquid skin cleanser compositions of Examples 1 to 25 and Comparative Examples 1 to 7 were filled into containers with a foamer pump dispenser (discharge volume 3 mL, manufactured by Yoshino Kogyosho Co., Ltd.), and 10 expert evaluators evaluated the ease of discharge and the texture of the discharged foam at 25° C. The average scores of the 10 expert evaluators were calculated and judged based on the following criteria.
[Evaluation criteria for dischargeability from a former container]
4 points: The pump is easy to press and produces fine foam. 3 points: The pump is easy to press, but there are some large foam particles mixed in. 2 points: The pump is a little difficult to press and there are many large foam particles mixed in. 1 point: The pump is very difficult to press and only large foam particles are discharged. [Criteria for determining dischargeability from the foamer container]
◎: 3.5 points or more and 4.0 points or less ○: 3.0 points or more and less than 3.5 points △: 2.0 points or more and less than 3.0 points ×: Less than 2.0 points

(Prescription Examples 1 to 6)
A liquid skin cleanser composition having the composition and content shown in Table 7 below was prepared in the same manner as in Example 1.

Details of the ingredients used in Examples 1 to 25, Comparative Examples 1 to 7, and Formulation Examples 1 to 6 are shown in Table 8 below.

*1: Potassium laurate was prepared by neutralizing lauric acid (NAA-122, manufactured by NOF Corporation) with potassium hydroxide (liquid caustic potash, manufactured by Asahi Glass Co., Ltd.).
*2: Potassium myristate was prepared by neutralizing myristic acid (NAA-142, manufactured by NOF Corporation) with potassium hydroxide (liquid caustic potash, manufactured by Asahi Glass Co., Ltd.).
*3: Potassium palmitate was prepared by neutralizing palmitic acid (NAA-160, manufactured by NOF Corporation) with potassium hydroxide (liquid caustic potash, manufactured by Asahi Glass Co., Ltd.).
*4: Potassium stearate was prepared by neutralizing stearic acid (NAA-180, manufactured by NOF Corporation) with potassium hydroxide (liquid caustic potash, manufactured by Asahi Glass Co., Ltd.).
*5: Appropriately selected from fragrances A to D described in paragraphs [0065] to [0071] of JP 2002-128658 A, fragrances A to E described in paragraphs [0076] to [0088] of JP 2003-73249 A, or blended fragrance compositions 1 to 4 described in paragraphs [0016] to [0023] of JP 2020-132680 A.

The liquid skin cleanser composition of the present invention is excellent in moist feeling on the skin after towel drying, non-stickiness on the skin after towel drying, dischargeability from a foamer container, and quick foaming and dense foam when used for washing with a body wash towel, and therefore can be suitably used in, for example, body shampoo, body soap, facial cleanser foam, hand soap, foam hand soap cleansing foam, makeup remover, and the like.

Claims (3)

(A) an anionic surfactant;
(B) a cationic polymer represented by the following general formula (B1) ,
(C) a potassium phosphate salt,
The viscosity at 25°C is 5 mPa s or more and 30 mPa s or less,
a mass ratio [(B)/(C)] of the content of the component (B) to the content of the component (C) is 0.2 or more and 8.0 or less;
A liquid skin cleanser composition filled in a former container.
(In the general formula (B1), n and m represent the molar ratio (mol %) of each structural unit, and m is 40 or more, and n+m=100.) the content of the component (A) is 10% by mass or more and 25% by mass or less based on the total amount of the liquid skin cleanser composition,
the content of the component (B) is 0.2% by mass or more and 0.8% by mass or less based on the total amount of the liquid skin cleanser composition,
2. The liquid skin cleanser composition according to claim 1, wherein the content of the component (C) is 0.1% by mass or more and 1.0% by mass or less, based on the total amount of the liquid skin cleanser composition. The liquid skin cleanser composition according to any one of claims 1 and 2, wherein the (C) potassium phosphate salt is at least one selected from potassium dihydrogen phosphate, dipotassium hydrogen phosphate, potassium tripolyphosphate, and potassium polyphosphate.