JP7349473B2 - liquid skin cleanser composition - Google Patents

Description

TECHNICAL FIELD This invention relates to liquid skin cleanser compositions.

Conventionally, liquid skin cleansing compositions such as hand soaps and body soaps have been required to have good foam performance such as foam retention, to provide smoothness to the skin during rinsing, and to provide smoothness to the skin after towel drying. It is desired that the product has a good feeling of use, such as imparting elasticity and not feeling tight on the skin after towel drying. However, while the majority of consumers wash their clothes using cleaning tools such as nylon towels and cotton towels, it is difficult to use foaming body soaps, which have been in increasing demand in recent years, with cleaning tools. However, there was a problem in that both foam retention and low-temperature stability were not satisfactory.

In order to provide a good feeling of use, for example, a liquid skin cleansing composition containing a fatty acid salt and a cationic polymer having a structural unit derived from dimethyldiallylammonium chloride has been proposed (for example, Patent Document 1 , 2, etc.). However, the proposed liquid skin cleansing composition is not satisfactory in terms of foam retention when lathered with a cleaning tool such as a nylon towel or cotton towel, skin elasticity after towel drying, and low temperature stability. There was a problem.

Furthermore, in order to improve the foam retention of liquid skin cleansing compositions, liquid skin cleansing compositions containing nonionic surfactants such as polyoxyethylene alkyl ether and fatty acid monoethanolamide have been proposed ( For example, see Patent Document 3). However, the proposed liquid skin cleansing composition has a problem in that the skin elasticity and low temperature stability after towel drying are not satisfactory.

In order to improve the foam retention of liquid skin cleansing compositions, it is generally known to add more long-chain fatty acids such as palmitic acid and stearic acid. When the ratio of long-chain fatty acids is increased, the fatty acids precipitate at low temperatures, resulting in problems such as an inability to maintain a transparent appearance and a decrease in skin elasticity after towel drying.

Therefore, when lathered with cleaning tools such as nylon towels or cotton towels, the lather is excellent, the skin does not feel tight after towel drying, the skin is smooth when rinsing, and the elasticity of the skin after towel drying is excellent. There is currently a strong desire to provide a liquid skin cleansing composition filled in a foam container that has good properties and can prevent fatty acid precipitation and maintain a transparent appearance even under low temperature conditions. It is.

JP2004-262838A Japanese Patent Application Publication No. 2014-208633 International Publication No. 2019/97950 specification

The present invention aims to solve the above-mentioned conventional problems and achieve the following objects. That is, the present invention provides a liquid that has excellent foam retention, does not feel tight on the skin after towel drying, has good skin smoothness during rinsing and good skin elasticity after towel drying, and has excellent low temperature stability. An object of the present invention is to provide a skin cleansing composition.

As a result of extensive studies, the present inventors found that (A) an anionic surfactant containing at least one selected from (a1) palmitate and (a2) stearate; and (B) dimethyl chloride. at least one cationic polymer selected from diallylammonium polymer and dimethyldiallylammonium chloride-acrylic acid copolymer; and (C) polyethylene glycol having an average molecular weight of 190 to 630; ) component is 10% by mass to 25% by mass, and the molar ratio of structural units derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer of component (B) is 40% by mole. The mass ratio [(A)/(C)] of the content of the component (A) to the content of the component (C) is from 15 to 100, and the product is filled in a former container. The liquid skin cleansing composition has excellent foam retention, does not feel tight on the skin after towel drying, has good skin smoothness during rinsing and good skin elasticity after towel drying, and is stable at low temperatures. I found it to be excellent.

The present invention is based on the above findings by the inventors, and means for solving the above problems are as follows. That is,
<1> (A) an anionic surfactant containing at least one selected from (a1) palmitate and (a2) stearate;
(B) at least one cationic polymer selected from dimethyldiallylammonium chloride polymer and dimethyldiallylammonium chloride-acrylic acid copolymer;
(C) polyethylene glycol having an average molecular weight of 190 to 630;
Contains
The content of the component (A) is 10% by mass to 25% by mass,
The molar ratio of structural units derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer of component (B) is 40 mol% or more,
The mass ratio [(A)/(C)] of the content of the component (A) to the content of the component (C) is 15 to 100,
A liquid skin cleansing composition characterized in that it is filled into a foamer container.
<2> The liquid skin cleansing composition according to <1> above, further comprising (D) a copolymer represented by the following general formula (1).
However, in the general formula (1), n, m, and z represent the molar ratio (mol%) of each structural unit, and n+m+z=100, where n is 0 to 34, m is 24 to 31, The above z is from 35 to 76.
<3> Mass ratio of the total content of the (a1) palmitate and the (a2) stearate to the content of the component (A) [((a1)+(a2))/(A)] The liquid skin cleansing composition according to any one of <1> to <2> above, wherein is 0.1 to 0.5.
<4> The content of the component (B) is 0.2% by mass to 0.8% by mass,
The content of the component (C) is 0.2% by mass to 0.8% by mass,
The content of the component (D) is 0.05% by mass to 0.3% by mass.
The liquid skin cleansing composition according to any one of <1> to <3> above.

According to the present invention, the above-mentioned problems in the conventional art can be solved and the above-mentioned objects can be achieved.The present invention has excellent foam retention, does not feel tight on the skin after towel-drying, provides smooth skin during rinsing, and achieves the above-mentioned objectives. It is possible to provide a liquid skin cleansing composition that has good skin elasticity and excellent low-temperature stability.

(Liquid skin cleansing composition)
The liquid skin cleansing composition of the present invention contains (A) an anionic surfactant, (B) a cationic polymer, (C) polyethylene glycol, and further contains (D) a copolymer. It is preferable that the composition further contains other components as necessary.

<(A) Anionic surfactant>
The anionic surfactant as the component (A) is mainly included to improve foam retention.
In addition, in this specification, "foam retention" means that the foam is maintained without disappearing when the cleaning tool is used. The cleaning tool is not particularly limited as long as it is used for cleaning the skin, and can be appropriately selected depending on the purpose. Examples include nylon towels, cotton towels, and the like.

The anionic surfactants of the component (A) include (a1) palmitate (hereinafter sometimes referred to as "component (a1)") and (a2) stearate (hereinafter "component (a2)"). contains at least one selected from the following.
The anionic surfactant as the component (A) is not particularly limited as long as it contains at least one selected from the above (a1) palmitate and the above (a2) stearate, and may be used as appropriate depending on the purpose. For example, higher fatty acid salts other than the component (a1) and the component (a2), 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 and POE alkyl ether sulfates are preferred, and higher fatty acid salts are more preferred.

-Higher fatty acid salt-
The higher fatty acid salt in the component (A) is not particularly limited as long as it contains at least one selected from the above (a1) palmitate and the above (a2) stearate, and may be used depending on the purpose. Examples thereof include laurate, myristate, and the like. These may be used alone or in combination of two or more. Among these, higher fatty acid salts containing palmitate, stearate, laurate, and myristate are preferred from the viewpoint of foam retention and skin elasticity after towel drying.

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

The higher fatty acid salt may be appropriately synthesized or a commercially available product.
Commercially available products of the higher fatty acid salts include, for example, the trade names Nonsal PK-1 (potassium palmitate, manufactured by NOF Corporation), Nonsal SK-1 (potassium stearate, manufactured by NOF Corporation), and NIKKOL Laurin. Potassium acid LK-120 (potassium laurate, manufactured by Nikko Chemicals Co., Ltd.), NIKKOL Potassium myristate MK-140 (potassium myristate, manufactured by Nikko Chemicals Co., Ltd.), Tysoap MNK-40 (contains potassium coconut oil fatty acid and potassium myristate) liquid, manufactured by Nikko Chemicals Co., Ltd.), etc.

The higher fatty acid salt can be blended as a higher fatty acid salt, but it is also possible to add the higher fatty acid and a salt serving as the counter ion such as potassium hydroxide separately into a blending tank and cause a neutralization reaction. It may also be used as a higher fatty acid salt.

The higher fatty acid used in the preparation of the higher fatty acid salt may be appropriately synthesized or a commercially available product.
Commercially available products of the higher fatty acids include, for example, the trade names NAA (registered trademark) -160 (palmitic acid, manufactured by NOF Corporation) and NAA (registered trademark) -180 (stearic acid, manufactured by NOF Corporation). , NAA (registered trademark)-122 (lauric acid, manufactured by NOF Corporation), NAA (registered trademark) -142 (myristic acid, manufactured by NOF Corporation), and the like.

The content of the palmitate salt (a1) is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 1% by mass to 10% by mass based on the total amount of the liquid skin cleansing composition. , more preferably 3% by mass to 9% by mass.

The content of the stearate salt (a2) is not particularly limited and can be selected as appropriate depending on the purpose, but it is 0.1% by mass to 3% by mass based on the total amount of the liquid skin cleansing composition. is preferred, and 0.2% by mass to 1% by mass is more preferred.

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

The content of the myristate is not particularly limited and can be appropriately selected depending on the purpose, but it is preferably 3% by mass to 14% by mass, and 8% by mass based on the total amount of the liquid skin cleanser composition. % to 14% by mass is more preferable.

-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, for example, a compound represented by the following general formula (A1), etc. Can be mentioned. The polyoxyethylene alkyl ether sulfate may be used alone or in combination of two or more.

In the general formula (A1), R ¹ represents an alkyl group, and the number of carbon atoms in the alkyl group portion is preferably 10 to 14.

In the general formula (A1), n represents the average number of added moles of ethylene oxide (E.O.), and the average number of added moles of ethylene oxide 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, and examples thereof 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), and polyoxyethylene (2) sodium lauryl ether sulfate. (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) alkyl (C12) , 13) sodium ether sulfate, polyoxyethylene (2) ammonium lauryl ether sulfate, polyoxyethylene (3) ammonium lauryl ether sulfate, and the like.
The numerical value in parentheses above represents the average number of added moles (n) of ethylene oxide (E.O.).

The polyoxyethylene alkyl ether sulfate may be appropriately synthesized or a commercially available product.
Commercially available products of the polyoxyethylene alkyl ether sulfate include, for example, trade names such as Texapon (registered trademark) N70 (manufactured by BASF, sodium polyoxyethylene (2) lauryl ether sulfate), and Shinoline SPE-1250. (manufactured by Shin Nippon Chemical Co., Ltd., polyoxyethylene (2) sodium lauryl ether sulfate), etc.

-Ether carboxylate-
The ether carboxylate in the component (A) is not particularly limited and can be appropriately selected depending on the purpose, for example, a compound represented by the following general formula (A2) or (A3), etc. can be mentioned. The ether carboxylates may be used alone or in combination of two or more.

In the general formulas (A2) and (A3), R ² is a straight-chain or branched alkyl group or alkenyl group having 5 to 23 carbon atoms, or a straight-chain or branched alkyl group or alkenyl having 5 to 23 carbon atoms. The number of carbon atoms in the R ² moiety, which represents a phenyl group substituted with a group, is preferably 10 to 14.

In the general formula (A2), R ³ 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 an 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 formulas (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. Examples include.
Note that the numerical value in parentheses above represents the average number of added moles (o) of alkylene oxide.

The ether carboxylate may be appropriately synthesized or a commercially available product.
Commercially available products of the ether carboxylate include, for example, Enadicol EC-30 (manufactured by Lion Specialty Chemicals Co., Ltd., sodium polyoxyethylene (3) lauryl ether acetate), Viewlite LCA-25F (polyoxyethylene (3) sodium lauryl ether acetate), oxyethylene (3) sodium lauryl ether acetate), Viewrite LCA-30D (polyoxyethylene (3) sodium lauryl ether acetate), Viewrite LCA-H (polyoxyethylene (4) lauryl ether acetate), Viewrite LCA- 25NH (laureth-4 carboxylic acid), Viewlite SHAA (sodium lauryl glycol carboxylate), Viewlite LCA (polyoxyethylene (3) sodium lauryl ether acetate) (manufactured by Sanyo Chemical Industries, Ltd.), Kaohakipo RLM-45NV (polyoxyethylene (4.5) sodium lauryl ether acetate), Kaohakipo RLM-100NV (polyoxyethylene (10) sodium lauryl ether acetate) (manufactured by Kao Corporation), and the like.
Note that the numerical value in parentheses above represents the average number of added moles (o) of alkylene oxide.

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

In the general formula (A4), R ⁴ is substituted with a straight chain or branched alkyl group or alkenyl group having 5 to 23 carbon atoms, or a straight chain or branched alkyl group or alkenyl group having 5 to 23 carbon atoms. represents a phenyl group. The number of carbon atoms in the R ⁴ portion is preferably 8 to 18.

In the general formula (A4), R ⁵ represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.

In the general formula (A4), R ⁶ and R ⁷ 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 part 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 the amino acid surfactant represented by the general formula (A4) include N-acyl-glycine and its salts such as N-cocoyl-glycine potassium (N-coconut oil fatty acid acylglycine potassium); N-acyl-N-carboxyethyl-glycine and its salts such as sodium myristoyl-N-carboxyethyl-glycine; sodium N-myristoyl-L-glutamate, potassium N-myristoyl-L-glutamate, N-coco fatty acid acyl- N-acylglutamic acid and its salts such as potassium L-glutamate, sodium N-palm fatty acyl-L-glutamate, and sodium N-stearoyl-L-glutamate; examples include potassium N-lauroyl-N-methyl-β-alanine. .

The amino acid surfactant may be appropriately synthesized or a commercially available product.
Commercially available amino acid surfactants include, for example, the trade names AMILYT (registered trademark) GCK-11 (N-coconut oil fatty acid acylglycine potassium), AMILYT (registered trademark) GCK-12K (N-coconut oil fatty acid acylglycine potassium), fatty acid acylglycine potassium), amirite (registered trademark) GCS-12K (N-coconut oil fatty acid acylglycine sodium), amirite (registered trademark) GCS-11 (N-coconut oil fatty acid acylglycine sodium), Amisoft (registered trademark) CS -11 (sodium N-myristoyl-L-glutamate), Amisoft (registered trademark) CS-22 (sodium N-coco fatty acid acyl-L-glutamate), Amisoft (registered trademark) LS-11 (N-lauroyl-L- Amisoft (registered trademark) MS-11 (sodium N-myristoyl-L-glutamate), Amisoft (registered trademark) HS-11P (sodium N-stearoyl-L-glutamate), Amisoft (registered trademark) HS-11P (F) (sodium N-stearoyl-L-glutamate), Amisoft (registered trademark) HS21 (disodium N-stearoyl-L-glutamate), amirite (registered trademark) ACS-12 (sodium cocoylalanine) (above, Ajinomoto Healthy Supply Co., Ltd.), Aminosurfact (registered trademark) AMMS-P1 (sodium N-myristoyl-L-glutamate) (manufactured by Asahi Kasei Chemicals Co., Ltd.), NIKKOL Sarcosinate MN (sodium myristoylmethylaminoacetate), NIKKOL Alaninate LN-30 (sodium lauroylmethyl-β-alanine) (manufactured by Nikko Chemicals Co., Ltd.), Alanone ACE (sodium coconut oil fatty acid methylalanine), Alanone AME (sodium myristoylmethyl-β-alanine), Alanone ALE (sodium lauroylmethyl-β-alanine) Sodium alanine) (manufactured by Kawaken Fine Chemicals Co., Ltd.), Enadicol L-30AN (sodium lauroylmethyl-β-alanine) (manufactured by Lion Specialty Chemicals Co., Ltd.), Softilt AT-L (sodium lauroylmethyl-β-alanine) ) (manufactured by NOF Corporation).

The content of the anionic surfactant as the component (A) is 10% by mass to 10% by mass based on the total amount of the liquid skin cleansing composition in terms of foam retention, skin elasticity after towel drying, and low temperature stability. 25% by weight, preferably 12% to 20% by weight. If the content of the component (A) is less than 10% by mass, the foam retention will be insufficient, and if it exceeds 25% by mass, the elasticity and low-temperature stability of the skin after towel drying will be insufficient.

Furthermore, as the mass ratio of the total content of the (a1) palmitate and the (a2) stearate to the content of the component (A) [((a1)+(a2))/(A)] is not particularly limited and can be selected appropriately depending on the purpose, but from the viewpoint of foam retention, skin elasticity after towel drying, and low temperature stability, it is preferably 0.1 to 0.5, and 0. More preferably 15 to 0.3. When the [((a1)+(a2))/(A)] is 0.1 or more, the foam retention is good, and when it is 0.5 or less, the skin elasticity and low temperature after towel drying are good. Good stability.

<(B) Cationic polymer>
The cationic polymer as the component (B) is at least one selected from dimethyldiallylammonium chloride polymer and dimethyldiallylammonium chloride-acrylic acid copolymer, and is mainly used to improve the elasticity of the skin after towel drying. It is also contained to improve the smoothness of the skin during rinsing.

The dimethyldiallylammonium chloride-acrylic acid copolymer in the component (B) is represented by the following general formula (B1).
However, in the general formula (B1), n and m indicate 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 component (B) is 65 mol% or more, from the viewpoint of skin elasticity after towel drying. Preferably, 96 mol% or more is more preferable.
The dimethyldiallylammonium chloride-acrylic acid copolymer may be used alone or in combination of two or more.

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

The weight average molecular weight of the cationic polymer of component (B) is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 10,000 to 1,000,000, and 15,000 to 450. ,000 is more preferable.
The weight average molecular weight of the cationic polymer of the component (B) can be determined using, for example, the SEC-MALLS-RI system (measurement conditions: column: Tosoh Corporation TSK gel α series α-M column 30 cm, solvent: 0.3M aqueous sodium nitrate solution). It can be measured by

The viscosity at 25° C. of a solution of the cationic polymer of component (B) with a solid content of 30% to 44% by mass is preferably 10 mPa·s to 15,000 mPa·s, and preferably 20 mPa·s to 12,000 mPa·s. is more preferable.
The viscosity can be measured using, for example, Brookfield Viscometer LVF (manufactured by Brookfield Corporation).

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

MERQUAT 100 (component name: dimethyldiallylammonium chloride polymer, manufactured by Japan Lubrizol Co., Ltd., solid content 39% to 44% by mass, viscosity at 25°C: 8,000mPa・s to 12,000mPa・s , weight average molecular weight: 150,000).
The viscosity was measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25°C with spindle No. The measurement can be performed using a rotor of 3 and under the condition of 6 revolutions/minute.

Marquat 106 (component name: dimethyldiallylammonium chloride polymer, manufactured by Nippon Lubrizol Co., Ltd., solid content 30% to 36% by mass, viscosity at 25°C: 20mPa・s to 65mPa・s, weight average molecular weight 15,000 ).
The viscosity was measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25°C with spindle No. The measurement can be performed using one rotor at 60 revolutions/minute.

Marquat 280 (component name: dimethyldiallylammonium chloride-acrylic acid copolymer, manufactured by Nippon Lubrizol Co., Ltd., solid content 39% to 43% by mass, viscosity at 25°C: 3,000mPa・s to 6,000mPa・s, weight average molecular weight 450,000, n:m=35:65 (mole ratio) in the general formula (1), molar ratio of structural units derived from dimethyldiallylammonium chloride is 65 mol%).
The viscosity was measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25°C with spindle No. The measurement can be performed using a No. 4 rotor at 60 revolutions/minute.

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

Among these, Marquat 100, Marquat 280, and Marquat 295 are preferable as the cationic polymer of the component (B) from the viewpoint of the elasticity of the skin after towel drying.

The content of the cationic polymer, component (B), is not particularly limited and can be selected as appropriate depending on the purpose, but it is important for foam retention, skin elasticity after towel drying, and skin smoothness during rinsing. From this point of view, the amount is preferably 0.1% by mass to 1% by mass, 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 component (B) is 0.1% by mass or more, the elasticity of the skin after towel drying is good, and when it is 1% by mass or less, the skin feels tight after towel drying. It is in good condition.

<(C) Polyethylene glycol>
The polyethylene glycol as the component (C) has an average molecular weight of 190 to 630, and is mainly contained to improve the elasticity and low-temperature stability of the skin after towel drying.

When the average molecular weight of the component (C) exceeds 630, the elasticity of the skin after towel drying decreases. Note that there is no commercially available polyethylene glycol having an average molecular weight of less than 190.
The average molecular weight can be measured by the average molecular weight test described in the Quasi-drug Ingredients Standards 2006.

Examples of the polyethylene glycol of component (C) include polyethylene glycol 200 (average molecular weight 190 to 210), polyethylene glycol 300 (average molecular weight 280 to 320), polyethylene glycol 400 (average molecular weight 380 to 420), and polyethylene glycol 600 (average molecular weight 380 to 420). average molecular weight of 570 to 630). These may be used alone or in combination of two or more. Among these, polyethylene glycol 400 (average molecular weight 380 to 420) is preferred as the component (C) from the viewpoint of skin elasticity after towel drying and low temperature stability.
Note that depending on the product, a # may be added between the polyethylene glycol and the numerical value, such as polyethylene glycol #200 for polyethylene glycol 200.

The content of polyethylene glycol, component (C), is not particularly limited and can be selected appropriately depending on the purpose, but from the viewpoint of skin elasticity and low temperature stability after towel drying, liquid skin cleansers It is preferably 0.1% by mass to 1.0% by mass, more preferably 0.2% by mass to 0.8% by mass, based on the total amount of the composition. When the content of component (C) is 0.1% by mass or more, the elasticity and low temperature stability of the skin after towel drying are good, and when the content is 1.0% by mass or less, low temperature stability is good. In good condition.

<Mass ratio [(A)/(C)]>
The mass ratio [(A)/(C)] of the content of the component (A) to the content of the component (C) is determined from the viewpoint of foam retention, skin elasticity after towel drying, and low temperature stability. , 15-100, preferably 20-40. If the mass ratio [(A)/(C)] is less than 15, foam retention will be insufficient, and if it exceeds 100, the elasticity and low-temperature stability of the skin after towel drying will be insufficient.

<(D) Copolymer represented by the following general formula (1)>
The copolymer of component (D) is preferably contained in order to improve the smoothness of the skin during rinsing.

The copolymer of component (D) is a copolymer represented by the following general formula (1).
However, in the general formula (1), n, m, and z represent the molar ratio (mol%) of each structural unit, and n+m+z=100.
The above n is preferably 0 to 34, the above m is preferably 24 to 31, and the above z is preferably 35 to 76.
Among these, n:m:z=0:24:76 in the general formula (1) is preferred from the viewpoint of smoothness of the skin during rinsing.

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

The weight average molecular weight of the copolymer of component (D) is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 100,000 to 3,000,000, and 100,000 to 1 ,600,000 is more preferred. The weight average molecular weight of the copolymer of component (D) can be determined, for example, by SEC-MALLS-RI system (measurement conditions: column: Tosoh Corporation TSK gel α series α-M column 30 cm, solvent: 0.3M aqueous sodium nitrate solution). It can be measured by

The viscosity at 25°C of the copolymer solution of the component (D) having a solid content of 8% by mass to 45% by mass is not particularly limited and can be appropriately selected depending on the purpose. , 1,500 mPa·s to 16,000 mPa·s are preferable.
The viscosity can be measured using, for example, Brookfield Viscometer LVF (manufactured by Brookfield Corporation).

As the copolymer of component (D), a suitably synthesized copolymer or a commercially available product may be used. Examples of the commercially available products include the following.

Marquat 550PR (component name: dimethylallylammonium chloride-acrylamide copolymer, manufactured by Lubrizol, solid content 8.8% to 9.8% by mass, viscosity at 25°C: 7,500mPa・s to 15,000mPa -s, weight average molecular weight: 1,600,000, n:m:z=0:30:70 in the general formula (1)). The viscosity was measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25°C with spindle No. The measurement can be performed using a No. 4 rotor at 10 revolutions/minute.

Marquat 740 (component name: dimethylallylammonium chloride-acrylamide copolymer, manufactured by Lubrizol, solid content 41% to 45% by mass, viscosity at 25°C: 2,000mPa・s to 12,000mPa・s, weight Average molecular weight: 120,000, n:m:z=0:24:76 in the general formula (1)). The viscosity was measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25°C with spindle No. The measurement can be performed using a No. 4 rotor at 10 revolutions/minute.

Marquat 3330PR (component name: acrylic acid-dimethyldiallylammonium chloride-acrylamide copolymer, manufactured by Lubrizol, solid content 10.2% to 11.5% by mass, viscosity at 25°C: 1,000 mPa・s to 6,000 mPa·s, weight average molecular weight: 1,500,000, n:m:z=34:31:35 in the general formula (1)). The viscosity was measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25°C with spindle No. The measurement can be performed using a No. 4 rotor at 30 revolutions/minute.

Marquat 3331PR (component name: acrylic acid-dimethyldiallylammonium chloride-acrylamide copolymer, manufactured by Lubrizol, solid content 9.7% by mass to 10.7% by mass, viscosity at 25°C: 2,000 mPa・s to 12,000 mPa·s, weight average molecular weight: 1,600,000, n:m:z=22.5:26.5:51 in the general formula (1)). The viscosity was measured using a Brookfield viscometer LVF (manufactured by Brookfield).
At 25°C spindle no. The measurement can be performed using a No. 5 rotor at 30 revolutions/minute.

Marquat 3940 (component name: acrylic acid-dimethyldiallylammonium chloride-acrylamide copolymer, manufactured by Lubrizol, solid content 41% to 45% by mass, viscosity at 25°C: 1,500mPa・s to 4,500mPa・s, weight average molecular weight: 150,000, n:m:z=31:29:40 in the general formula (1)). The viscosity was measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25°C with spindle No. The measurement can be performed using a No. 3 rotor at 10 revolutions/minute.

Among these, Marquat 740 is preferred as the copolymer of component (D) from the viewpoint of smoothness of the skin during rinsing.

The content of the copolymer of component (D) is 0.01% based on the total amount of the liquid skin cleansing composition, from the viewpoint of smoothness of the skin during rinsing and firmness of the skin after towel drying. It is preferably from 0.5% by weight, more preferably from 0.05% to 0.3% by weight. If the content of the component (D) is 0.01% by mass or more, the skin will have good smoothness during rinsing, and if it is 0.5% by mass or less, the skin will feel tight after towel drying. is in good condition.

<Other ingredients>
In addition to the components (A), (B), (C), and (D), the liquid skin cleanser composition may also contain other ingredients as long as they do not impair the effects of the present invention. Other ingredients can be added depending on the situation.
Examples of the other components include surfactants other than the component (A), water-soluble polymers other than the component (B) and the component (D), oils, silicones, alcohols, lanolin derivatives, and proteins. Derivatives, drugs (e.g. vitamins, etc.), humectants, bactericides, preservatives, pH adjusters, antioxidants, sequestering agents, ultraviolet absorbing/scattering agents, animal and plant extracts or their derivatives, chelating agents , amino acids Examples include acids, dyes, fragrances, pigments, inorganic powders, clay minerals, and water-insoluble polymer compound powders. These may be used alone or in combination of two or more.

Examples of the oil include vegetable oils and fats such as castor oil, olive oil, cacao oil, hydrogenated palm oil, camellia oil, coconut oil, wood wax, jojoba oil, grapeseed oil, and avocado oil, and their ester compounds; mink oil; Animal oils and fats such as egg yolk oil; Waxes such as beeswax, spermaceti 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; glycerol tri-2-ethylhexanoate, 2-ethylhexyl stearate, butyl stearate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, Examples include esters such as octyldodecyl oleate and cholesterol oleate. These may be used alone or in combination of two or more.
The content of the oil is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose, but 0.1 mass based on the total amount of the liquid skin cleanser composition % to 3% by mass is preferred.

Examples of the alcohols include lower or higher alcohols, and specific examples include natural and synthetic higher alcohols such as cetyl alcohol, oleyl alcohol, stearyl alcohol, hexyldecanol, octyldodecanol, and lauryl alcohol. Can be mentioned. These may be used alone or in combination of two or more.
The content of the alcohol is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose. Preferably, the amount is from % by mass to 3% by mass.

Examples of the humectant 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, and the like. can be mentioned. These may be used alone or in combination of two or more.
The content of the moisturizing agent is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose. Preferably, the amount is from % by mass to 10% by mass.

Examples of the preservative include benzoate, sorbate, dehydroacetate, paraoxybenzoic acid ester, 2,4,4'-trichloro-2'-hydroxydiphenyl ether, 3,4,4'-trichlorocarbani Lido, benzalkonium chloride, hinokitiol, resorcinol, methylchloroisothiazolinone/methylisothiazolinone liquid (product name: Caisson CG, manufactured by Rohm & Haas Japan), salicylic acid, pentanediol, phenoxyethanol, ethanol, etc. Can be mentioned. These may be used alone or in combination of two or more.
The content of the preservative is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose. Preferably, the amount is from % by mass to 1% by mass.

Examples of the antioxidant include dibutylhydroxytoluene, butylhydroxyanisole, ascorbic acid, and the like. These may be used alone or in combination of two or more.
The content of the antioxidant is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose. 1% by mass to 1% by mass is preferred.

Examples of the chelating agent include edetate disodium, ethylenediaminetetraacetate, hexametaphosphate, gluconic acid, and the like. These may be used alone or in combination of two or more.
The content of the chelating agent is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose. Preferably, the amount is from % by mass to 1% by mass.

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

Examples of the ultraviolet absorbing/scattering agent include 2-hydroxy-4-methoxybenzophenone, octyl dimethyl para-aminobenzoate, ethylhexyl para-methoxycynamate, titanium oxide, kaolin, and talc. These may be used alone or in combination of two or more.

Examples of the vitamins 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, Examples include orotic acid and its derivatives. These may be used alone or in combination of two or more.
The content of the vitamins is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose. It is preferably from % by mass to 0.5% by mass.

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 content of the amino acids is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose. It is preferably from % by mass to 0.5% by mass.

Examples of the water-insoluble polymer compound powder include nylon and polyethylene. These may be used alone or in combination of two or more.

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

-viscosity-
The viscosity at 25° C. of the liquid skin cleansing composition is not particularly limited and can be appropriately selected depending on the container used, etc., but is preferably 4 mPa·s to 40 mPa·s, and 8 mPa·s to 30 mPa·s. -s is more preferable.
For example, when using a pump former container capable of discharging foam by pressing down the nozzle part, and one each of 305 mesh and 200 mesh porous membranes, the liquid skin cleanser composition The viscosity of the product is preferably 30 mPa·s or less, more preferably 25 mPa·s or less.
The viscosity is measured, for example, using a BM type viscometer (manufactured by Tokyo Keiki Co., Ltd.) at a sample temperature of 25°C, a rotation speed of 60 rpm, and a No. The viscosity can be measured by measuring the viscosity after 1 minute using the rotor No. 1.

-container-
The liquid skin cleansing composition is of a type that is filled into a foamer container and discharged in the form of a foam.
The foamer container is not particularly limited and can be appropriately selected from known foamer containers, such as non-gas foam discharge containers, aerosol containers using a propellant and a pressure-resistant container, and the like. Among these, non-gas type foam discharge containers are preferred.

The non-gas type foam discharge container is not particularly limited as long as it can mix the liquid skin cleansing composition with air and discharge it in a foamed state, and can be appropriately selected depending on the purpose. , a squeeze foamer container that can discharge foam by manually squeezing the bottle body, and a pump foamer container that can discharge foam by pressing down on a nozzle. As such a former container, those manufactured by Daiwa Seikan Co., Ltd., Yoshino Kogyo Co., Ltd., etc. can be used. More specifically, as the former container, former containers described in JP-A-7-315463, JP-A-8-230961, JP-A-2005-193972, etc. can be used.

The non-gas type foam discharge container has a foam forming member, specifically, a porous membrane body (preferably made of a plastic material such as nylon, polyester, or polyolefin) for forming foam. , bubbles are formed when the liquid skin cleansing composition passes through the porous membrane.

The mesh of the porous membrane body is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 100 mesh or more, more preferably 100 mesh to 400 mesh, and particularly preferably 200 mesh to 305 mesh. .
Further, the number of porous membranes is not particularly limited and can be appropriately selected depending on the purpose, but from the viewpoint of improving foaming performance, 2 to 4 is preferable.

-Production method-
The method for producing the liquid skin cleansing composition is not particularly limited and can be appropriately selected depending on the purpose, for example, the (A) component, the (B) component, and the (C) component, Furthermore, if necessary, it can be obtained by mixing the component (D), the other components, and purified water (the remaining amount is blended so that the total liquid skin cleansing composition is 100% by mass).
Specifically, the (A) component is dissolved in purified water heated to 70°C to 80°C, cooled to 40°C or less, and then the (B) component, the (C) component, and the necessary The above-mentioned (D) component and the above-mentioned other components can be added and manufactured according to the requirements.

The liquid skin cleanser composition may be prepared using an apparatus. The device is not particularly limited and can be appropriately selected depending on the purpose, such as a stirring device equipped with stirring blades that have shearing force and can mix the whole.
The stirring blade is not particularly limited and can be appropriately selected depending on the purpose, and includes, for example, a propeller, a turbine, a disper, and the like.

-Applications-
The application site of the liquid skin cleansing composition is not particularly limited and can be appropriately selected depending on the purpose. For example, it can be used on the whole body, face, hands, etc.

The use of the liquid skin cleansing composition is not particularly limited and can be selected as appropriate depending on the purpose, but it has excellent foam retention, does not feel tight on the skin after towel drying, and does not leave the skin feeling tight during rinsing. It has good smoothness and elasticity of the skin after towel drying, and has excellent low-temperature stability, so it is used, for example, in body shampoo, body soap, facial cleansing foam, hand soap, foaming hand soap, cleansing foam, makeup remover, etc. In particular, it can be suitably used in body soaps that are lathered using cleaning tools such as nylon towels or cotton towels.

EXAMPLES The present invention will be specifically explained below with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples in any way.

The content of each component described in Examples and Comparative Examples is shown in "mass%", the total amount is 100% by mass, and all values are converted into pure content. In addition, the mass ratio [( A )/( C )] of the content (mass%) of component (A) to the content (mass%) of component (C) is rounded to the second decimal place. I have found and listed the top rankings. Mass ratio of the total content (mass%) of component (a1) (potassium palmitate) and component (a2) (potassium stearate) to the content of component (A) [((a1)+(a2))/ (A)] was rounded off to the third decimal place and calculated and written to the second decimal place.

(Examples 1 to 11 and 19 to 32, and Comparative Examples 1 to 10)
Liquid skin cleansing compositions having the compositions and contents shown in Tables 1 to 5 below were prepared according to the following method.
Purified water is heated to 70°C to 80°C to dissolve the anionic surfactant (A), cooled to below 40°C, and then heated to 70°C to 80°C, cooled to below 40°C, and then added to the cationic polymer (B) or the anionic surfactant (A). Cationized cellulose as a comparative component and polyethylene glycol as a comparative component of component (C) or component (C) were added. The amount of the purified water was 95% by mass of the final liquid skin cleansing composition. After that, if the predetermined pH (pH 10.0) is not reached, potassium hydroxide, which is a common ingredient, is added to adjust the predetermined pH to 10.0. , and perfume were added, and purified water was added so that the total amount was 100% by mass to obtain each liquid skin cleansing composition of Examples 1 to 11 and 19 to 32 and Comparative Examples 1 to 10.
In addition, when preparing each of the liquid skin cleansing compositions, a propeller was used as a stirring blade, and stirring was performed using a three-one motor (HEIDON BL1200, manufactured by Shinto Kagaku Co., Ltd.). Further, the pH was measured at 25° C. using a pH meter (HM-30R, manufactured by TOA DKK).

(Examples 12 to 18)
Liquid skin cleansing compositions having the compositions and contents shown in Tables 2 and 3 below were prepared according to the following method.
In preparing the liquid skin cleansing compositions of Examples 1 to 11 and 19 to 32, the anionic surfactant as the component (A) was dissolved, and the cationic polymer as the component (B) and the polyethylene glycol as the component (C) were dissolved. Examples 12 to 18 were prepared in the same manner as the liquid skin cleansing compositions of Examples 1 to 10 and 16 to 29, except that the copolymer of component (D) was also added when adding . Each liquid skin cleansing composition was obtained.

Each of the obtained liquid skin cleansing compositions of Examples 1 to 32 and Comparative Examples 1 to 10 was filled into a container equipped with a former pump dispenser [discharge volume 3 mL, manufactured by Yoshino Kogyo Co., Ltd.], and subjected to the following evaluation. Using.

For each of the liquid skin cleansing compositions of Examples 1 to 32 and Comparative Examples 1 to 10, "foam retention", "skin smoothness during rinsing", and "skin elasticity after towel drying" were evaluated as follows. ”, “Skin tightness after towel drying”, and “Low temperature stability” were evaluated and judged. The results are shown in Tables 1 to 5 below.

<Foam retention>
Ten expert evaluators took two pumps (approximately 6 g) of each of the liquid skin cleansing compositions of Examples 1 to 32 and Comparative Examples 1 to 10 onto a nylon towel (Awaster Body Towel, soft, manufactured by Kikron), and After washing the whole body, "foam retention" was observed and evaluated based on the following evaluation criteria. The results were determined by calculating the average score of the 10 professional evaluators, and making judgments based on the following criteria for determining the average score.
-Evaluation criteria for "foam retention"-
4 points: By the time you finish washing your body, most of the foam you put on your body at the beginning of washing remains. 3 points: By the time you finish washing your body, about 80% to 50% of the foam you put on your body at the beginning of washing remains. Yes 2 points: By the time I finish washing my body, about 20% to 40% of the foam I put on my body at the beginning of washing remains. 1 point: By the time I finish washing my body, most of the foam I put on my body at the beginning of washing remains. No - Judgment criteria for "foam retention" -
◎: Average score is 3.5 points or more and 4.0 points or less ○: Average score is 3.0 points or more and less than 3.5 points △: Average score is 2.0 points or more and less than 3.0 points Less than ×: Average score is less than 2.0 points

<Smooth skin after rinsing>
Ten expert evaluators took 5 pumps (approximately 15 g) of each of the liquid skin cleansing compositions of Examples 1 to 32 and Comparative Examples 1 to 10, washed their entire bodies with their hands, and then rinsed with warm water at 40°C. The "smoothness of the skin after rinsing" was evaluated based on the following evaluation criteria. The results were determined by calculating the average score of the 10 professional evaluators, and making judgments based on the following criteria for determining the average score.
-Evaluation criteria for "smoothness of skin after rinsing"-
4 points: The skin feels very smooth 3 points: The skin feels smooth 2 points: The skin feels a little smooth 1 point: The skin does not feel smooth - "Skin smoothness when rinsing" Judgment criteria-
◎: Average score is 3.5 points or more and 4.0 points or less ○: Average score is 3.0 points or more and less than 3.5 points △: Average score is 2.0 points or more and less than 3.0 points Less than ×: Average score is less than 2.0 points

<Skin elasticity after towel drying>
Ten expert evaluators took 5 pumps (approximately 15 g) of each of the liquid skin cleansing compositions of Examples 1 to 32 and Comparative Examples 1 to 10, washed their entire bodies with their hands, and then rinsed with warm water at 40°C. Rinse and towel dry. Thereafter, after resting for 30 minutes in a constant temperature room at 24°C, "skin elasticity after towel drying" was evaluated based on the following evaluation criteria. The results were determined by calculating the average score of the 10 professional evaluators, and making judgments based on the following criteria for determining the average score.
-Evaluation criteria for "skin elasticity after towel drying"-
4 points: You can feel the skin moving when you press your forearm with your palm. 3 points: You can feel your skin moving when you press your forearm with your palm. 2 points: You can feel your skin moving when you press your forearm with your palm. 1 point: I don't feel the skin moving when I press my forearm with my palm - Criteria for determining "skin elasticity after towel drying" -
◎: Average score is 3.5 points or more and 4.0 points or less ○: Average score is 3.0 points or more and less than 3.5 points △: Average score is 2.0 points or more and less than 3.0 points Less than ×: Average score is less than 2.0 points

<Tight skin after towel drying>
Ten expert evaluators took 5 pumps (approximately 15 g) of each of the liquid skin cleansing compositions of Examples 1 to 32 and Comparative Examples 1 to 10, washed their entire bodies with their hands, and then rinsed with warm water at 40°C. Rinse and towel dry. Thereafter, after resting for 30 minutes in a constant temperature room at 24° C., the "tightness of the skin after towel drying" was evaluated based on the following evaluation criteria. The results were determined by calculating the average score of the 10 professional evaluators, and making judgments based on the following criteria for determining the average score.
-Evaluation criteria for "skin tightness after towel drying"-
4 points: I don't feel any tightness on my skin 3 points: I feel a slight tightness on my skin 2 points: I feel a lot of tightness on my skin 1 point: I feel very tight on my skin Criteria for determining “tightness”
◎: Average score is 3.5 points or more and 4.0 points or less ○: Average score is 3.0 points or more and less than 3.5 points △: Average score is 2.0 points or more and less than 3.0 points Less than ×: Average score is less than 2.0 points

<Low temperature stability>
Approximately 50 g of each of the liquid skin cleansing compositions of Examples 1 to 32 and Comparative Examples 1 to 10 was placed in a cylindrical transparent glass bottle (diameter 4 cm, height 7.5 cm) and kept in a -5°C constant temperature bath for 2 weeks. saved. A specialized panel visually observed the state of precipitate formation in the liquid skin cleansing composition after storage for two weeks, and evaluated it based on the following evaluation criteria.
-Judgment criteria for "low temperature stability"-
◎: No precipitation of crystals or solids observed within 2 weeks ○: Almost no precipitation of crystals or solids observed within 2 weeks (no problem in terms of commercial value)
×: A large amount of crystals or solids were observed to precipitate within 2 weeks.

Details of each component used in Examples 1 to 32 and Comparative Examples 1 to 10 are shown in Table 6 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.).

The liquid skin cleansing composition can be suitably used in a foamer container, has excellent foam retention, does not feel tight on the skin after being towel-dried, and provides smoothness of the skin during rinsing and smoothness of the skin after towel-drying. It has good elasticity and excellent low-temperature stability, so it can be used in body shampoos, body soaps, facial cleansing foams, hand soaps, foaming hand soaps, cleansing foams, makeup removers, etc. In particular, nylon towels and cotton It can be suitably used in body soaps that are lathered using a cleaning tool such as a towel.

Claims (4)

(A) an anionic surfactant containing at least one selected from (a1) palmitate and (a2) stearate;
(B) at least one cationic polymer selected from dimethyldiallylammonium chloride polymer and dimethyldiallylammonium chloride-acrylic acid copolymer;
(C) polyethylene glycol having an average molecular weight of 190 to 630;
Contains
The content of the component (A) is 10% by mass to 25% by mass,
The content of the component (B) is 0.1% by mass to 1% by mass,
The content of the component (C) is 0.1% by mass to 1.0% by mass,
The molar ratio of structural units derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer of component (B) is 40 mol% or more,
The mass ratio [(A)/(C)] of the content of the component (A) to the content of the component (C) is 15 to 100,
A liquid skin cleansing composition, characterized in that it is filled into a foamer container. The liquid skin cleansing composition according to claim 1, further comprising (D) a copolymer represented by the following general formula (1).
However, in the general formula (1), n, m, and z represent the molar ratio (mol%) of each structural unit, and n+m+z=100, where n is 0 to 34, m is 24 to 31, The above z is from 35 to 76. The mass ratio of the total content of the (a1) palmitate and the (a2) stearate to the content of the component (A) [((a1)+(a2))/(A)] is 0. The liquid skin cleansing composition according to any one of claims 1 to 2, which has a molecular weight of .1 to 0.5. The content of the component (B) is 0.2% by mass to 0.8% by mass,
The content of the component (C) is 0.2% by mass to 0.8% by mass,
The content of the component (D) is 0.05% by mass to 0.3% by mass ,
A liquid skin cleansing composition according to any one of claims 2 to 3.