JP7316805B2 - skin cleanser composition - Google Patents

Description

The present invention relates to skin cleanser compositions.

Conventionally, skin cleansing compositions such as body soaps and hand soaps are required to have both sufficient foam quality and moisturizing properties after cleansing. In recent years, in addition to these, needs for various functions and effects are increasing.

For example, it does not run off when applied, has good usability, quickly absorbs oil stains containing a large amount of solid fat, has excellent detergency, and has good dissolution and crumbling properties during rinsing. A skin cleanser that has excellent rinsability and an excellent feeling of removing dirt without leaving a feeling of residue on the skin after washing (see, for example, Patent Document 1), has a quick killing activity, and provides a large amount of stable foam, A foaming antimicrobial skin cleanser exhibiting enhanced tissue (e.g., skin) compatibility (see, e.g., Patent Document 2), excellent foaming during use, quickly disappearing sliminess during rinsing, and strong stop feeling. In addition, there have been proposed cleansing compositions that are also excellent in feeling on the skin after drying (see, for example, Patent Document 3).

On the other hand, the demands for skin cleansing compositions vary depending on the region, etc., and the development of various skin cleansing compositions that can meet the above demands is also required. There is a demand for a skin cleanser composition that not only satisfies both the properties of the skin and the properties of the skin, but also provides a smooth and smooth feel after drying with a towel and improves the glossiness of the skin. However, a satisfactory one has not yet been provided, and prompt provision thereof is strongly desired.

JP 2018-145118 A Japanese Patent Publication No. 2017-522356 JP 2012-232941 A

An object of the present invention is to solve the above-mentioned conventional problems and to achieve the following objects. That is, it is an object of the present invention to provide a skin cleanser composition which is excellent in all of foaming properties, moisturizing properties after cleansing, smooth skin feeling after towel-drying, and improved skin gloss. .

As a result of extensive studies by the present inventors to solve the above problems, (A) polyoxyethylene alkyl ether sulfate, (B) amphoteric surfactant, (C) cationic polymer, and (D) fatty acid By containing the sorbitan ester and (E) the polyoxyethylene alkyl ether, it is easy to foam during cleansing, has excellent moisturizing properties after cleansing, and improves the smoothness of the skin and the glossiness of the skin after use. I have found that I feel better.

The present invention is based on the findings of the present inventors, and means for solving the above problems are as follows. Namely
<1> (A) a polyoxyethylene alkyl ether sulfate;
(B) an amphoteric surfactant;
(C) a cationic polymer;
(D) a fatty acid sorbitan ester;
(E) A skin cleanser composition characterized by containing a polyoxyethylene alkyl ether.
<2> The mass ratio {(D)+(E)}/(A) of the content of the component (A) to the total content of the components (D) and (E) is 0.03. The skin cleanser composition according to <1> above, wherein the ratio is ~7.0.
<3> The skin cleanser composition according to any one of <1> to <2>, wherein the component (B) is an alkylhydroxysultaine.
<4> The skin cleanser composition according to any one of <1> to <3>, wherein the component (C) is cationic guar gum.
<5> The skin cleanser composition according to any one of <1> to <4>, wherein the pH at 25°C is in the range of 3.0 to 6.5.
<6> The content of the component (A) is 6% by mass to 10% by mass,
The content of the component (B) is 1% by mass to 5% by mass,
The content of the component (C) is 0.1% by mass to 2% by mass,
The content of the component (D) is 0.3% by mass to 2% by mass,
The skin cleanser composition according to any one of <1> to <5>, wherein the content of component (E) is 0.5% by mass to 5% by mass.

According to the present invention, the above-mentioned problems in the conventional art can be solved and the above-mentioned objects can be achieved. A good skin cleanser composition can be provided.

(Skin cleanser composition)
The skin cleanser composition of the present invention comprises (A) component polyoxyethylene alkyl ether sulfate, (B) component amphoteric surfactant, (C) component cationic polymer, and (D) component It contains at least a fatty acid sorbitan ester and a polyoxyethylene alkyl ether as component (E), and if necessary further contains other components.

<(A) Polyoxyethylene alkyl ether sulfate>
The polyoxyethylene alkyl ether sulfate of component (A) is mainly contained to improve foamability.

The polyoxyethylene alkyl ether sulfate of component (A) is not particularly limited and can be appropriately selected depending on the intended purpose. Examples thereof include compounds represented by the following general formula (1). The polyoxyethylene alkyl ether sulfate of component (A) may be used singly or in combination of two or more.
R ¹ —O—(CH ₂ —CH ₂ O) _n —SO ₃ X General formula (1)

In general formula (1), R ¹ represents an alkyl group, and the alkyl group is preferably a linear or branched alkyl group having 6 to 24 carbon atoms, and 10 to 16 carbon atoms, from the viewpoint of foamability. A straight or branched chain alkyl group of is more preferred.

In the general formula (1), n represents the average number of added moles of the polyoxyethylene group, and the average number of added moles of the polyoxyethylene group is preferably 1 to 6 from the viewpoint of foamability, and 1 to 3 is more preferred.

In the general formula (1), X represents an alkali metal, ammonium, or organic ammonium.
The alkali metal is not particularly limited and can be appropriately selected depending on the intended purpose. Examples thereof include sodium and potassium.
The organic ammonium is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include organic ammonium derived from alkanolamine such as monoethanolamine, diethanolamine and triethanolamine.
Among these, X is preferably an alkali metal, more preferably sodium, from the viewpoint of foamability.

Specific examples of the polyoxyethylene alkyl ether sulfate of component (A) include polyoxyethylene (1) sodium lauryl ether sulfate and polyoxyethylene (2) sodium lauryl ether sulfate (also known as POE (2) sodium laureth sulfate). ), polyoxyethylene (3) sodium lauryl ether sulfate (also known as POE (3) sodium laureth sulfate), polyoxyethylene (4) sodium lauryl ether sulfate, polyoxyethylene (5) sodium lauryl ether sulfate, polyoxyethylene ( 3) sodium alkyl (C12,13) ether sulfate, polyoxyethylene (2) ammonium lauryl ether sulfate, polyoxyethylene (3) ammonium lauryl ether sulfate, and the like.
In addition, the numerical value in said () represents the average added mole number (n) of a polyoxyethylene group.

A commercially available product can also be used as the polyoxyethylene alkyl ether sulfate of the component (A).
Examples of commercially available polyoxyethylene alkyl ether sulfates of component (A) include Texapon N28AS 270N (manufactured by BASF), Emal 270J, Emal 20C (manufactured by Kao Corporation), Nissan Trax, Persoft ( (manufactured by NOF Corporation) and the like.

The content of the polyoxyethylene alkyl ether sulfate of component (A) is not particularly limited and can be appropriately selected according to the purpose. Therefore, it is preferably 3% by mass or more and less than 12% by mass, more preferably 6% by mass to 10% by mass, based on the total amount of the skin cleanser composition. When the content is 3% by mass or more, the foamability is good, and when the content is less than 12% by mass, retention of the stratum corneum moisture content after washing and improvement in skin gloss are good.

<(B) Amphoteric Surfactant>
The amphoteric surfactant of component (B) is mainly contained to improve foamability.

The amphoteric surfactant of component (B) is not particularly limited and can be appropriately selected depending on the intended purpose. type (alkylbetaine, alkylamidobetaine), sulfobetaine type (alkylsulfobetaine, alkylhydroxysulfobetaine), phosphobetaine type, amine oxide, phosphonoxide are preferred, and alkylhydroxysulfobetaine (hereinafter referred to as "alkylhydroxysultaine" ) is more preferable. These may be used individually by 1 type, and may use 2 or more types together.

The imidazoline type amphoteric surfactant is not particularly limited and can be appropriately selected depending on the intended purpose. fatty acid acyl-N'-carboxymethyl-N'-hydroxyethylethylenediamine sodium;

The carbobetaine-type amphoteric surfactant is not particularly limited and can be appropriately selected depending on the intended purpose. Examples include amphoteric surfactants, alkylamidobetaine type amphoteric surfactants such as lauramidopropyl betaine, coconut oil fatty acid amidopropyl betaine, and palm kernel oil fatty acid amidopropyl betaine.

The sulfobetaine-type amphoteric surfactant is not particularly limited and can be appropriately selected depending on the intended purpose. is mentioned. These may be used individually by 1 type, and may use 2 or more types together.

The phosphobetaine-type amphoteric surfactant is not particularly limited and can be appropriately selected depending on the intended purpose. Examples thereof include lauryl hydroxyphosphobetaine.

The amine oxide is not particularly limited and can be appropriately selected depending on the intended purpose. Examples thereof include acyl tertiary amine oxides such as lauryldimethylamine oxide.

The phosphone oxide is not particularly limited and can be appropriately selected depending on the intended purpose. Examples thereof include acyl tertiary phosphone oxides such as lauryldimethyl phosphone oxide.

Among the amphoteric surfactants, lauryl hydroxysulfobetaine (sometimes referred to as "lauryl hydroxysultaine"), betaine lauryldimethylaminoacetate, and aminopropyl betaine laurate are more preferable from the viewpoint of foaming properties.

A commercially available product can also be used as the amphoteric surfactant of component (B).
Commercially available amphoteric surfactants of component (B) include, for example, alkylhydroxysulfobetaines such as Amphithol 20HD (manufactured by Kao Corporation), Softazolin LSB (manufactured by Kawaken Fine Chemicals Co., Ltd.), and alkyldimethylaminoacetic acid betaine. As, Amphitol 24B (manufactured by Kao Corporation), Nissan Anon BL (manufactured by NOF Corporation), NIKKOL AM-301 (manufactured by Nikko Chemicals Co., Ltd.), Amogen S (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), Obazolin LB ( Toho Chemical Industry Co., Ltd.), Likavion A-100 (manufactured by New Japan Chemical Co., Ltd.), Amipol N (manufactured by Nicca Chemical Co., Ltd.), Bister ML (manufactured by Matsumoto Yushi Pharmaceutical Co., Ltd.), Amphitol 86B (manufactured by Kao Corporation) ), Rikavion A-700 (manufactured by New Japan Chemical Co., Ltd.), Nissan Anon BF (manufactured by NOF Corporation), and the like.

The content of the amphoteric surfactant as component (B) is not particularly limited and can be appropriately selected according to the intended purpose. 0.1% by mass to 30% by mass is preferable, and 1% by mass to 5% by mass is more preferable. Foaming property is favorable in the said content being in the said preferable range.

<(C) cationic polymer>
The cationic polymer of component (C) is mainly contained to impart a smooth feel to the skin after towel-drying.

The cationic polymer of component (C) is a polymer having a cationic group or a group capable of being ionized into a cationic group. The cationic polymers also include amphoteric polymers that are cationic as a whole.

The cationic polymer of component (C) is not particularly limited and can be appropriately selected according to the purpose. cationized guar gum, cationized cellulose, cationized starch, dimethyldiallylammonium chloride polymer, dimethyldiallylammonium chloride-acrylamide copolymer, and nitrogen-containing polymethacrylate are preferred, and cationized guar gum is more preferred. These may be used individually by 1 type, and may use 2 or more types together.

The cationic guar gum is obtained by adding a cationic functional group to guar gum, and examples thereof include hydroxypropyl guar hydroxypropyltrimonium chloride represented by the following general formula (2).
In the general formula (2), R ' represents a hydrogen atom or a group represented by the following general formula (i) or the following general formula (ii), and at least general formula (i) and general formula (ii) in the molecule It has a group represented by m is 8 to 10,000.

前記一般式（ｉ）中、Ｚ^－は陰イオンであり、Ｃｌ^－が好ましい。

In the above general formula (i), Z ^- is an anion, preferably Cl ^- .

The degree of cationicity of the cationic guar gum depends on the degree of addition of cationic groups. The cation degree of the cationized guar gum is not particularly limited and may be appropriately selected depending on the intended purpose. 0.5 meq/g is more preferred.

The weight-average molecular weight of the cationized guar gum is not particularly limited and can be appropriately selected depending on the intended purpose.

前記一般式（３）中、Ｒ’’、Ｒ’’’、Ｒ’’’’は水素原子又は下記一般式（ｉ）で表される基を示し、分子中に少なくとも一般式（ｉ）で表される基を有する。ｐ、ｑ、ｒは０～５の数であり、ｓは５００～２０，０００である。 The cationic cellulose is obtained by adding a cationic functional group to cellulose. For example, O-[2-hydroxy-3-(trimethylammonio)propyl]hydroxyethyl cellulose chloride represented by the following general formula (3) ( Display name: polyquaternium-10).

In the general formula (3), R'', R''', R'''' represent a hydrogen atom or a group represented by the following general formula (i), and at least general formula (i) in the molecule have the groups represented. p, q, r are numbers from 0 to 5, and s is from 500 to 20,000.

前記一般式（ｉ）中、Ｚ^－は陰イオンであり、Ｃｌ^－が好ましい。

In the above general formula (i), Z ^- is an anion, preferably Cl ^- .

The cationic degree of the cationic cellulose varies depending on the degree of addition of cationic groups. The cationic degree of the cationized cellulose is not particularly limited and can be appropriately selected depending on the purpose. .7 meq/g is more preferred.

The weight-average molecular weight of the cationized cellulose is not particularly limited and can be appropriately selected depending on the intended purpose.

The cationic starch is a starch to which a cationic functional group has been added, and examples thereof include hydroxypropyltrimonium chloride starch, which is a quaternary ammonium compound composed of starch and glycidylpropyltrimethylammonium chloride.

The cationic degree of the cationic starch depends on the degree of addition of the cationic groups. The cationic degree of the cationic starch is not particularly limited and can be appropriately selected depending on the purpose, but is preferably in the range of 0.1 meq/g to 3.0 meq/g, more preferably 0.5 meq/g to 1 .7 meq/g is more preferred.

The weight-average molecular weight of the cationized starch is not particularly limited and can be appropriately selected depending on the intended purpose.

The cationic degree of the cationic guar gum, cationic cellulose, and cationic starch can be easily calculated if the chemical structure is clear, but even if the structure such as the monomer ratio is unknown, the Kjeldahl method is used. can be calculated from measurements of N content such as The above-described cationic degree is calculated based on the value measured by Nitrogen Quantitative Method 2, which is the Kjeldahl method, which is a general test method based on standards for cosmetic raw materials. Note that meq/g, which is a unit of cationic degree, indicates the number of milliequivalents of N cationic groups per 1 g of the sample.

The weight-average molecular weights of the cationized guar gum, cationized cellulose, and cationized starch can be measured by liquid chromatography using a general GPC column and comparing with polymers having known molecular weights. The weight average molecular weight described above is a value measured using GPC-MALLS (gel permeation chromatograph/multi-angle laser light scattering detector), and a sample diluted with a mobile phase having a polymer concentration of about 1000 ppm. The solution was measured using a TSK-GELα column (manufactured by Tosoh Corporation) with a 0.5 mol/L sodium perchlorate solution as a mobile phase and a wavelength of about 633 nm with a multi-angle light scattering detector. Polyethylene glycol with a known molecular weight was used as a standard.

A commercial item can also be used for the cationic polymer of the said (C) component.
Commercial products of the cationic polymer of the component (C) include, for example, cationic guar gum such as JAGUAR C-14S, JAGUAR C-17, JAGUAR-EXCEL, JAGUAR C-162, JAGUAR LS, JAGUAR C-500STD, JAGUAR-Optima (manufactured by Rhone-Poulenc), ball gum CG-M, labor gum CG-M6L, labor gum CG-M8M (manufactured by Dainippon Pharmaceutical Co., Ltd.), cationized celluloses such as Leogard LP, Leogard GP and Leogard MGP, Leoguard KGP, Leoguard XE-511K (manufactured by Lion Corporation), UCARE LR-30M, UCARE JR-400, UCARE JR-30M (manufactured by Dow Chemical Japan Co., Ltd.), Cathinal HC-100 (Toho Chemical Kogyo Co., Ltd.), and cationized starches include Sensomer CI-50 (manufactured by Nalco Company), Amylomer 25L, Amylomer 50M (manufactured by Graefe Chemie), Pharma MS5940 (manufactured by Corn Products International), and the like. .

The content of the cationic polymer of component (C) is not particularly limited and can be appropriately selected according to the purpose. , and foaming properties, it is preferably 0.01% by mass to 5% by mass, more preferably 0.1% by mass to 2% by mass, based on the total amount of the skin cleanser composition. When the content is 0.01% by mass or more, it gives a smooth feel to the skin after drying with a towel and improves the glossiness of the skin. is good.

<(D) Fatty acid sorbitan ester>
The fatty acid sorbitan ester of component (D) is mainly contained to impart a smooth feel to the skin after towel-drying.

The alkyl chain of the fatty acid of the fatty acid sorbitan ester of component (D) is not particularly limited and can be appropriately selected according to the purpose. From the viewpoint of gloss improvement, a straight chain (saturated or unsaturated) or branched chain with a carbon chain length of 6 to 22 is preferable, and a straight chain (saturated or unsaturated) or branched chain with a carbon chain length of 6 to 12 is more preferable. preferable.

The fatty acid sorbitan ester of component (D) is preferably monoester, diester, triester, or sesquiester from the viewpoints of imparting a smooth feeling to the skin after towel-drying and improving the glossiness of the skin. , monoesters, diesters, and sesquiesters are more preferred.

The fatty acid sorbitan ester of component (D) may be used singly or in combination of two or more.

Specific examples of the fatty acid sorbitan ester include sorbitan caprylate, sorbitan caprate, sorbitan laurate, sorbitan myristate, sorbitan palmitate, sorbitan stearate, sorbitan distearate, sorbitan tristearate, sorbitan isostearate, and sorbitan diisostearate. , sorbitan triisostearate, sorbitan oleate, sorbitan dioleate, sorbitan trioleate, sorbitan behenate, sorbitan olive oil fatty acid, sorbitan coconut fatty acid, sorbitan sesquicaprylate, sorbitan sesquicaprate, sorbitan sesquistearate, sorbitan sesquiisostearate , sorbitan sesquioleate, etc., and sorbitan sesquicaprylate is preferred.

A commercial item can also be used for fatty acid sorbitan ester of the said (D) component.
Examples of commercially available fatty acid sorbitan esters as component (D) include ANTIL Soft SC (manufactured by Evonik), Poem C-250 (manufactured by Riken Vitamin Co., Ltd.), and Sorbon S-10E (manufactured by Toho Chemical Industry Co., Ltd.). etc.

The content of the fatty acid sorbitan ester of component (D) is not particularly limited and can be appropriately selected according to the purpose. , and foamability, it is preferably 0.1% by mass to 10% by mass, more preferably 0.3% by mass to 2% by mass, based on the total amount of the skin cleanser composition. When the content is 0.1% by mass or more, a smooth feeling is imparted to the skin after drying with a towel, and the feeling of improving the glossiness of the skin is good. is good.

<(E) Polyoxyethylene alkyl ether>
The polyoxyethylene alkyl ether of component (E) is mainly contained to impart a smooth feel to the skin after towel-drying.

The polyoxyethylene alkyl ether of component (E) is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include compounds represented by the following general formula (4). The polyoxyethylene alkyl ether of component (E) may be used alone or in combination of two or more.
R ⁴ —O—(CH ₂ —CH ₂ O) _y —H General formula (4)

In the general formula (4), R ⁴ represents a straight-chain or branched-chain alkyl or alkenyl group having 8 to 22 carbon atoms, and imparts a smooth feel to the skin after drying with a towel and improves the gloss of the skin. , a straight or branched chain alkyl group having 13 to 21 carbon atoms is preferred, and a straight or branched chain alkyl group having 17 to 20 carbon atoms is more preferred.

In the general formula (4), y represents the average number of added moles of 1 to 80 polyoxyethylene groups, and from the viewpoint of imparting a smooth feel to the skin after drying with a towel and improving the glossiness of the skin, The average number of added moles of the polyoxyethylene group is preferably 1-40, more preferably 2-12.

Specific examples of the polyoxyethylene alkyl ether of component (E) include polyoxyethylene tridecyl ether, polyoxyethylene myristyl ether, polyoxyethylene pentadecyl ether, polyoxyethylene cetyl ether, polyoxyethylene heptadecyl ether, Polyoxyethylene stearyl ether, polyoxyethylene isostearyl ether, polyoxyethylene nonadecyl ether, polyoxyethylene arachidyl ether, polyoxyethylene heneicosyl ether and the like.

A commercial item can also be used for the polyoxyethylene alkyl ether of the said (E) component.
Examples of commercially available polyoxyethylene alkyl ethers for component (E) include Braunon SR-711 (manufactured by Aoki Yushi Kogyo Co., Ltd.) and Emarex 611 (manufactured by Nippon Emulsion Co., Ltd.).

The content of the polyoxyethylene alkyl ether of component (E) is not particularly limited and can be appropriately selected according to the purpose. From the point of view of improvement feeling and foamability, it is preferably 0.1% by mass to 20% by mass, more preferably 0.5% by mass to 5% by mass, based on the total amount of the skin cleanser composition. When the content is 0.1% by mass or more, it gives a smooth feel to the skin after drying with a towel and improves the glossiness of the skin. is good.

<Mass ratio {(D) + (E)}/(A)>
The mass ratio {(D)+(E)}/(A) of the content of the component (A) and the total content of the component (D) and the component (E) is not particularly limited, Although it can be appropriately selected depending on the purpose, it is preferably 0.03 to 7.0, more preferably 0.08 to 0.4. When the mass ratio is 0.03 or more, the glossiness of the skin is improved and the skin feels smooth after drying with a towel. is.

<Other ingredients>
In addition to the components (A) to (E), the skin cleanser composition of the present invention may optionally contain other components as long as the effects of the present invention are not impaired. .
Examples of the other components include pH adjusters, antioxidants, sequestering agents, preservatives, bactericides, wetting agents, viscosity modifiers, feel agents, solubilizers, dispersants, emulsifiers, and opacifiers. , dyes, pigments, fragrances, oils, animal and plant extracts or derivatives thereof, ultraviolet absorbers, inorganic powders, water-insoluble polymer powders, and medicinal ingredients. These may be used individually by 1 type, and may use 2 or more types together.
A commercial item can also be used for said other component.
The content of the other components in the skin cleanser composition is not particularly limited and can be appropriately selected depending on the purpose.

-pH-
The pH of the skin cleanser composition at 25°C is not particularly limited and can be appropriately selected according to the purpose. A range is preferred. When the pH is within the preferred range, the moisture content of the stratum corneum after washing is well retained.
The pH can be measured using the method specified in the general test method of Standards for Cosmetic Ingredients (2nd Edition). Specifically, it can be measured by inserting an electrode of a pH meter directly into the composition and reading the pH value after it stabilizes based on the general test method described above.

-Production method-
The method for producing the skin cleanser composition of the present invention is not particularly limited and can be appropriately selected according to the intended purpose.
The skin cleanser composition may be prepared using an apparatus. The device is not particularly limited and can be appropriately selected depending on the intended purpose.
The stirring blade is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include propellers, turbines, and dispersers.

-Applications-
The skin cleanser composition of the present invention has good foaming properties, good moisturizing properties after cleansing, and smooth skin feeling after drying with a towel. For example, it can be used for face wash, hand soap, body soap, cleansing foam, make-up remover and the like, and it can be used particularly preferably for body soap.

The present invention will be described in more detail below based on Examples, Comparative Examples, and Formulation Examples, but the present invention is not limited to the following Examples and Formulation Examples.

The content of each component described in Examples, Comparative Examples, and Formulation Examples is shown in mass %, and all values are converted to pure content.
In addition, the mass ratio of the content of component (A) to the total content of components (D) and (E) {(D) + (E)}/(A) is rounded to the third decimal place. and calculated to the second decimal place and recorded.

(Examples 1 to 25 and Comparative Examples 1 to 5)
A predetermined amount of each component was mixed so as to have the composition shown in Tables 1 to 6 below to produce a skin cleanser composition.
The pH was measured at 25°C using a pH meter (HM-30R, manufactured by TOA DKK), and the amount of citric acid added was such that the pH (25°C) of each composition was 5.5. adjusted.

<Evaluation>
[Foamability, smoothness of skin after towel-drying, improvement of skin gloss]
The prepared skin cleanser compositions of Examples 1 to 25 and Comparative Examples 1 to 5 were evaluated by 10 professional evaluators as "foamability" and "after drying with a towel" when the body parts other than the head were washed. Evaluation was made on each item of "smoothness of skin" and "feeling of improvement in skin gloss", and evaluation was made according to the following evaluation criteria. When the evaluation was "⊚" or "◯", it was determined that the performance was good. The results are shown in Tables 1-6.
-Evaluation criteria-
A: 9 to 10 professional evaluators answered that it was good.
○: 6 to 8 professional evaluators answered that it was good.
△: 3 to 5 professional evaluators answered that it was good.
x: 0 to 2 professional evaluators answered that the evaluation was good.

[Stratum corneum moisture content retention rate]
First, for untreated skin, skin surface conductance, which correlates with water content, was measured using a commercially available device (Skicon-200) (conductance value before skin treatment).
Next, using tap water at 40°C, the inside of the forearm was washed with the prepared skin cleanser compositions of Examples 1 to 25 and Comparative Examples 1 to 5, followed by thorough rinsing with tap water and a towel. was used to remove moisture. The skin surface conductance of the treated skin was measured using Skicon-200 (conductance value after skin treatment).
The measurement was performed after acclimatization for 30 minutes in a constant temperature room at 22° C. and 40% relative humidity.
The stratum corneum water content retention rate was calculated using the following formula from the obtained measured values of skin conductance, and evaluated according to the following evaluation criteria. When the evaluation was "⊚" or "◯", it was determined that the performance was good. The results are shown in Tables 1-6.
Stratum corneum moisture content retention rate (%) = (conductance value after skin treatment/conductance value before skin treatment) x 100
-Evaluation criteria-
A: The moisture content retention rate of the stratum corneum is greater than 100%.
○: stratum corneum moisture content retention rate is 90% or more and 100% or less.
x: stratum corneum moisture content retention rate is less than 90%.

(Prescription Examples 1-3)
According to the composition shown in Table 7 below, skin cleansing compositions of Formulation Examples 1 to 3 were prepared in the same manner as in the above Examples and Comparative Examples, and each evaluation was performed.

Details of each component used in the above Examples, Comparative Examples, and Formulation Examples are shown in Tables 8 and 9 below.

The skin cleanser composition of the present invention has good foaming properties, good moisturizing properties after cleansing, and smooth skin feeling after drying with a towel. For example, it can be used for face wash, hand soap, body soap, cleansing foam, make-up remover and the like, and it can be used particularly preferably for body soap.

Claims (5)

(A) a polyoxyethylene alkyl ether sulfate;
(B) a sulfobetaine-type amphoteric surfactant;
(C) cationized guar gum ;
(D) a fatty acid sorbitan ester that is a sesquiester ;
(E) contains a polyoxyethylene alkyl ether,
The (A) polyoxyethylene alkyl ether sulfate is a compound represented by the following general formula (1),
R ¹ —O—(CH ₂ —CH ₂ O) _n —SO ₃ X General formula (1)
(In general formula (1) above, R ¹ is a straight-chain alkyl group having 10 to 16 carbon atoms, n is 1 to 3, and X represents an alkali metal, ammonium, or organic ammonium.)
(D) the fatty acid sorbitan ester, which is a sesquiester , has a saturated linear alkyl chain with a carbon chain length of 6 to 12 ;
The (E) polyoxyethylene alkyl ether is a compound represented by the following general formula (4),
R ⁴ —O—(CH ₂ —CH ₂ O) _y —H General formula (4)
(In general formula (4) above, R ⁴ is a straight-chain alkyl group having 17 to 20 carbon atoms, and y is 2 to 12.)
The content of the component (A) is 3% by mass or more and less than 12% by mass,
The content of the component (B) is 0.1% by mass to 30% by mass,
The content of the component (C) is 0.01% by mass to 5% by mass,
The content of the component (D) is 0.1% by mass to 10% by mass,
A skin cleanser composition characterized in that the content of component (E) is 0.1% by mass to 20% by mass . The mass ratio {(D)+(E)}/(A) of the content of component (A) to the total content of components (D) and (E) is 0.03 to 7.0. 0, the skin cleanser composition according to claim 1. 3. The skin cleanser composition according to any one of claims 1 and 2, wherein the component (B) is an alkylhydroxysultaine. 4. The skin cleanser composition according to any one of claims 1 to 3, which has a pH at 25°C in the range of 3.0 to 6.5. The content of the component (A) is 6% by mass to 10% by mass,
The content of the component (B) is 1% by mass to 5% by mass,
The content of the component (C) is 0.1% by mass to 2% by mass,
The content of the component (D) is 0.3% by mass to 2% by mass,
The skin cleanser composition according to any one of claims 1 to 4, wherein the content of component (E) is 0.5% by mass to 5% by mass.