Liquid skin cleansing agent composition

Abstract

To provide a liquid skin cleansing agent composition that is excellent in terms of foam density, the absence of skin stiffness after rinsing, and ease of discharge from the container. [Solution] A liquid skin cleansing composition comprising: (A) a higher fatty acid salt having 12 to 20 carbon atoms; (B) one or more selected from alkyl sulfosuccinate, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan fatty acid ester, sorbitan fatty acid ester, and N-acyl glutamic acid or a salt thereof; and (C) a polyhydric alcohol with an IOB value of 3 to 5, wherein the content of component (A) is 18% to 25% by mass of the total amount of the liquid skin cleansing composition, component (A) contains stearate, and the content of stearate is 0.8% to 2% by mass of the total amount of the liquid skin cleansing composition, and the composition is characterized by being filled into a foaming container.

Description

Technical Field

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

Background Art

[0002] Conventionally, for liquid skin cleansing compositions such as body soap, there has been a demand for a liquid skin cleansing composition that has excellent foaming performance and leaves the skin in a good state after use.

[0003] As a conventional technique, for example, when used in a foam ejection pump container, in order to produce foam having finer cell structure and excellent retention after ejection, a foaming detergent containing 5 to 30% by weight of a surfactant, 1 to 7% by weight of a monohydric alcohol, and 3 to 20% by weight of a polyhydric alcohol has been proposed (see Patent Document 1). However, there has been a concern that as the blending amount of the polyhydric alcohol increases, a feeling of skin roughness occurs during rinsing. In addition, when increasing the blending amount of fatty acid salt for the purpose of achieving good foaming performance, there has also been a concern that the skin cleansing composition gels in the container and the dischargeability decreases under high temperature or low humidity conditions.

[0004] Therefore, it is desired to provide a liquid skin cleansing composition that is excellent in foam density, absence of skin roughness after rinsing, and dischargeability from the container.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present invention aims to solve the aforementioned problems of the conventional approach and achieve the following objectives. Specifically, the present invention aims to provide a liquid skin cleansing composition that is excellent in terms of foam density, the absence of skin stiffness after rinsing, and ease of discharge from the container. [Means for solving the problem]

[0007] The present invention relates to a liquid skin cleansing composition comprising (A) a higher fatty acid salt having 12 to 20 carbon atoms, (B) one or more selected from alkyl sulfosuccinate, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan fatty acid ester, sorbitan fatty acid ester, and N-acyl glutamic acid or a salt thereof, and (C) a polyhydric alcohol with an IOB value of 3 to 5, wherein the content of component (A) is 18% to 25% by mass of the total amount of the liquid skin cleansing composition, and component (A) contains stearate, and the content of stearate is 0.8% to 2% by mass of the total amount of the liquid skin cleansing composition, and is filled into a foaming container.

[0008] This invention is based on the inventors' findings, and the means for solving the aforementioned problems are as follows: <1> (A) A higher fatty acid salt with 12 to 20 carbon atoms, (B) One or more selected from alkyl sulfosuccinates, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan fatty acid esters, sorbitan fatty acid esters, and N-acyl glutamic acid or its salts, (C) Polyhydric alcohols with an IOB value of 3 or more and 5 or less, A liquid skin cleansing composition containing, The content of component (A) is 18% by mass or more and 25% by mass or less based on the total amount of the liquid skin cleansing composition. The aforementioned component (A) contains stearate, and the amount of stearate is 0.8% by mass or more and 2% by mass or less based on the total amount of the liquid skin cleansing composition. This is a liquid skin cleansing composition characterized by being filled into a foaming container. <2> The ratio of the content of component (C) to the content of component (B) {(C) / (B)} is between 2.7 and 28. <1> This is a liquid skin cleansing composition as described above. <3> The content of component (B) is 0.5% by mass or more and 3% by mass or less based on the total amount of the liquid skin cleansing composition. The content of component (C) is 8% by mass or more and 14% by mass or less based on the total amount of the liquid skin cleansing composition. <1> or <2> This is a liquid skin cleansing composition as described above. <4> (D) Contains a cationic polymer containing 40 mol% or more of structural units derived from dimethyldiallylammonium chloride. <1> from <3> This is a liquid skin cleansing composition as described in any of the above. <5> The content of component (D) is 0.2% by mass or more and 0.8% by mass or less based on the total amount of the liquid skin cleansing composition. <4> This is a liquid skin cleansing composition as described above. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a liquid skin cleansing agent composition that is excellent in terms of foam density, the absence of skin stiffness after rinsing, and ease of discharge from the container. [Modes for carrying out the invention]

[0010] (Liquid skin cleansing agent composition) The liquid skin cleansing composition of the present invention contains (A) a higher fatty acid salt having 12 to 20 carbon atoms, (B) one or more selected from alkyl sulfosuccinates, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan fatty acid esters, sorbitan fatty acid esters, and N-acyl glutamic acid or salts thereof, and (C) a polyhydric alcohol with an IOB value of 3 to 5. Optionally, it may also contain (D) a cationic polymer containing 40 mol% or more structural units derived from dimethyldiallylammonium chloride, and other components. In this specification, "(A) higher fatty acid salts having 12 to 20 carbon atoms" may be referred to as "(A)" or "component (A)", "(B) one or more selected from alkyl sulfosuccinates, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan fatty acid esters, sorbitan fatty acid esters, and N-acyl glutamic acid or salts thereof" may be referred to as "(B)" or "component (B)", "(C) polyhydric alcohols with an IOB value of 3 to 5 may be referred to as "(C)" or "component (C)", and "(D) cationic polymers containing 40 mol% or more of structural units derived from dimethyldiallylammonium chloride" may be referred to as "(D)" or "component (D)".

[0011] <(A) Higher fatty acid salts with 12 to 20 carbon atoms> The aforementioned (A) higher fatty acid salts with 12 to 20 carbon atoms impart good foam density to the liquid skin cleansing composition.

[0012] The aforementioned component (A) contains stearate. There are no particular restrictions on the aforementioned component (A), and it can be appropriately selected depending on the purpose. However, from the viewpoint of achieving good foam density, saturated fatty acid salts with 12 to 16 carbon atoms are preferred among fatty acid salts other than stearate.

[0013] Specific examples of component (A) include laurate, myristic acid, palmitate, and stearate. These can be used individually or in combination of two or more.

[0014] The counter ion in the higher fatty acid salt is not particularly limited and can be appropriately selected according to the purpose. Examples include alkali metal salts, amine salts, amino acid salts, etc. The alkali metal salt is not particularly limited and can be appropriately selected according to the purpose. Examples include sodium salts, potassium salts, etc. The amine salt is not particularly limited and can be appropriately selected according to the purpose. Examples include ammonium salts; alkanolamine salts such as monoethanolamine salts, diethanolamine salts, triethanolamine salts, 2-amino-2-methylpropanol, 2-amino-2-methylpropanediol, etc. The amino acid salt is not particularly limited and can be appropriately selected according to the purpose. Examples include lysine salts, arginine salts, etc. Among these, alkali metal salts are preferred, and potassium salts are more preferred.

[0015] The higher fatty acid salt can be blended as a fatty acid salt, or the fatty acid and the salt serving as the counter ion can be separately added to the blending tank and subjected to a neutralization reaction to form a fatty acid salt.

[0016] For the fatty acid used in the preparation of the higher fatty acid salt, those synthesized as appropriate may be used, or commercially available products may be used. Examples of commercially available products of the fatty acid include, for example, under the trade name, NAA (registered trademark)-122 (lauric acid, manufactured by NOF Corporation), NAA (registered trademark)-142 (myristic acid, manufactured by NOF Corporation), NAA (registered trademark)-160 (palmitic acid, manufactured by NOF Corporation), NAA (registered trademark)-180 (stearic acid, manufactured by NOF Corporation), etc.

[0017] The aforementioned component (A) may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available products of component (A) include, by trade name, KORTACID 1299 (LAURIC ACID) / RSPO MB (manufactured by PACIFIC OLEO), KORTACID 1499 (MYRISTIC ACID) / RSPO MB (manufactured by PACIFIC OLEO), PALMITIC ACID (POFAC 1695)RSPO-MB (manufactured by SOUTHERN ACIDS INDUSTRIES SDN.BHD.), and EDENOR C18-98 (RSPO MB) (manufactured by Edenor Technology).

[0018] From the viewpoint of improving foam density and discharge performance, the stearate content is 0.8% by mass or more and 2% by mass or less, and preferably 0.8% by mass or more and 1.5% by mass or less, relative to the total amount of the liquid skin cleansing agent composition. When the content of component (A) is 0.8% by mass or more relative to the total amount of the liquid skin cleansing agent composition, the foam density is good. When the content of component (A) is 2% by mass or less relative to the total amount of the liquid skin cleansing agent composition, the discharge properties are good.

[0019] The content of component (A) is 18% by mass or more and 25% by mass or less, and preferably 18% by mass or more and 23% by mass or less, based on the total amount of the liquid skin cleansing agent composition, from the viewpoint of improving the density of the foam and the moist feeling of the skin after rinsing. When the content of component (A) is 18% by mass or more of the total amount of the liquid skin cleansing composition, the density of the foam and the moist feeling of the skin after rinsing are improved. When the content of component (A) is 25% by mass or less relative to the total amount of the liquid skin cleansing composition, the discharge properties are good.

[0020] <(B) One or more selected from alkyl sulfosuccinates, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan fatty acid esters, sorbitan fatty acid esters, and N-acyl glutamic acid or its salts> The above (B) one or more selected from alkyl sulfosuccinate, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan fatty acid ester, sorbitan fatty acid ester, and N-acyl glutamic acid or its salts imparts to the liquid skin cleansing composition a lack of skin stiffness after rinsing and good drainage properties.

[0021] —Alkyl sulfosuccinate— There are no particular restrictions on the alkyl sulfosuccinate, and it can be appropriately selected depending on the purpose. However, from the viewpoint of improving the lack of skin stiffness after rinsing and the ease of excretion, alkyl sulfosuccinates in which the alkyl group has 10 to 18 carbon atoms and the average number of ethylene oxide added is 0 to 10 are preferred, and alkyl sulfosuccinates in which the alkyl group has 12 to 15 carbon atoms and the average number of ethylene oxide added is 0 to 5 are more preferred.

[0022] There are no particular restrictions on the alkyl sulfosuccinates, and they can be appropriately selected depending on the purpose. However, from the viewpoint of improving the lack of skin stiffness after rinsing and the ease of excretion, diethylhexyl sulfosuccinate, lauryl sulfosuccinate, polyoxyethylene (1) alkyl(C12-15) sulfosuccinate, polyoxyethylene (average number of moles of ethylene oxide added: 2) alkyl(C12-15) sulfosuccinate, polyoxyethylene (average number of moles of ethylene oxide added: 3) alkyl(C12-15) sulfosuccinate, polyoxyethylene ( Dialkyl(C12-14) sulfosuccinate (average number of moles of ethylene oxide added: 5), dialkyl(C12-14) sulfosuccinate (average number of moles of ethylene oxide added: 6), dialkyl(C12-14) sulfosuccinate (average number of moles of ethylene oxide added: 7), dialkyl(C12-14) sulfosuccinate (average number of moles of ethylene oxide added: 8), and dialkyl(C12-14) sulfosuccinate (average number of moles of ethylene oxide added: 9) are preferred. Among these, diethylhexyl sulfosuccinate, lauryl sulfosuccinate, polyoxyethylene (average number of moles of ethylene oxide added: 1) alkyl(C12-15) sulfosuccinate, polyoxyethylene (average number of moles of ethylene oxide added: 2) alkyl(C12-15) sulfosuccinate, and polyoxyethylene (average number of moles of ethylene oxide added: 3) alkyl(C12-15) sulfosuccinate are more preferred from the viewpoint of reducing skin stiffness after rinsing and improving drainage. These can be used individually or in combination of two or more.

[0023] Examples of counterions for the alkyl sulfosuccinate include alkali metal ions, alkaline earth metal ions, ammonium ions, amine-derived cations, and amino acid-derived cations. Examples of alkali metal ions include sodium ions and potassium ions. Examples of alkaline earth metal ions include calcium ions. Among these, sodium ions are preferred.

[0024] The alkyl sulfosuccinate may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available alkyl sulfosuccinates include ViewLite ESS (polyoxyethylene (average number of moles of ethylene oxide added: 2) alkyl(C12-14) sulfosuccinate disodium, manufactured by Sanyo Chemical Industries, Ltd.).

[0025] —Polyoxyethylene hydrogenated castor oil— There are no particular restrictions on the polyoxyethylene hydrogenated castor oil, and it can be appropriately selected depending on the purpose. However, from the viewpoint of preventing skin stiffness after rinsing and improving the ease of removal, polyoxyethylene hydrogenated castor oil (average number of moles of ethylene oxide added: 50) is preferred.

[0026] The aforementioned polyoxyethylene hydrogenated castor oil may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available polyoxyethylene hydrogenated castor oil include NIKKOL HCO-50 (polyoxyethylene hydrogenated castor oil, average number of moles of ethylene oxide added: 50, manufactured by Nikko Chemicals Co., Ltd.) under the trade name.

[0027] —Polyoxyethylene sorbitan fatty acid ester— There are no particular restrictions on the polyoxyethylene sorbitan fatty acid ester, and it can be appropriately selected depending on the purpose. However, from the viewpoint of improving the lack of skin stiffness after rinsing and the ease of excretion, a polyoxyethylene sorbitan fatty acid ester having 12 to 22 carbon atoms derived from the fatty acid and an average number of ethylene oxide additions of 5 to 25 is preferred, and a polyoxyethylene sorbitan fatty acid ester having 12 to 20 carbon atoms derived from the fatty acid and an average number of ethylene oxide additions of 15 to 25 is more preferred.

[0028] There are no particular restrictions on the polyoxyethylene sorbitan fatty acid esters mentioned above, and they can be appropriately selected depending on the purpose. However, from the viewpoint of improving the absence of skin stiffness after rinsing and the ease of excretion, polyoxyethylene sorbitan monoisostearate (average number of moles of ethylene oxide added: 20), polyoxyethylene sorbitan monostearate (average number of moles of ethylene oxide added: 6), polyoxyethylene sorbitan monooleate (average number of moles of ethylene oxide added: 6), polyoxyethylene sorbitan monolaurate (average number of moles of ethylene oxide added: 20), polyoxyethylene sorbitan monostearate (average number of moles of ethylene oxide added: 20), and polyoxyethylene sorbitan monooleate (average number of moles of ethylene oxide added: 20) are preferred. Among these, polyoxyethylene sorbitan monoisostearate (average number of moles of ethylene oxide added: 20), polyoxyethylene sorbitan monolaurate (average number of moles of ethylene oxide added: 20), polyoxyethylene sorbitan monostearate (average number of moles of ethylene oxide added: 20), and polyoxyethylene sorbitan monooleate (average number of moles of ethylene oxide added: 20) are more preferred from the viewpoint of reducing skin stiffness after rinsing and improving drainage.

[0029] The aforementioned polyoxyethylene sorbitan fatty acid ester may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available polyoxyethylene sorbitan fatty acid esters include, by trade name, NIKKOL TS-106V (polyoxyethylene sorbitan monostearate, average number of moles of ethylene oxide added: 6, manufactured by Nikko Chemicals Co., Ltd.), NIKKOL TO-106V (polyoxyethylene sorbitan monooleate, average number of moles of ethylene oxide added: 6, manufactured by Nikko Chemicals Co., Ltd.), Nonion LT-20 (polyoxyethylene sorbitan monolaurate, average number of moles of ethylene oxide added: 20, manufactured by NOF Corporation), NIKKOL TS-10V (polyoxyethylene sorbitan monostearate, average number of moles of ethylene oxide added: 20, manufactured by Nikko Chemicals Co., Ltd.), and NIKKOL TO-10V (polyoxyethylene sorbitan monooleate, average number of moles of ethylene oxide added: 20, manufactured by Nikko Chemicals Co., Ltd.).

[0030] —Sorbitan fatty acid ester— There are no particular restrictions on the sorbitan fatty acid ester, and it can be appropriately selected depending on the purpose. However, from the viewpoint of improving the lack of skin stiffness after rinsing and the ease of excretion, a sorbitan fatty acid ester having 12 to 18 carbon atoms derived from the fatty acid is preferred, and a sorbitan fatty acid ester having 14 to 18 carbon atoms derived from the fatty acid is more preferred.

[0031] There are no particular restrictions on the sorbitan fatty acid esters mentioned above, and they can be appropriately selected depending on the purpose. However, from the viewpoint of preventing skin stiffness after rinsing and improving the ability to remove the sorbitan fatty acid ester, sorbitan laurate, sorbitan palmitate, sorbitan stearate, and sorbitan isostearate are preferred. Among these, sorbitan palmitate, sorbitan stearate, and sorbitan isostearate are more preferred from the viewpoint of reducing skin stiffness after rinsing and improving drainage.

[0032] The sorbitan fatty acid ester may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available sorbitan fatty acid esters include NIKKOL SP-10V (sorbitan palmitate, manufactured by Nikko Chemicals Co., Ltd.) under the trade name.

[0033] —N-acyl glutamic acid or its salts— There are no particular restrictions on the N-acyl glutamic acid or its salt, and it can be appropriately selected depending on the purpose. However, from the viewpoint of improving the lack of skin stiffness after rinsing and the ease of excretion, N-acyl glutamic acid or its salt derived from fatty acids with 8 to 18 carbon atoms is preferred. Specific examples of the N-acyl glutamic acid or its salt include cocoyl glutamate and lauroyl glutamate.

[0034] The N-acyl glutamic acid or its salt may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available N-acyl glutamic acid or its salt include, for example, AminoSurfact ACDS-L (sodium lauroyl glutamate, manufactured by Asahi Kasei Finechem Co., Ltd.) under the trade name.

[0035] From the viewpoint of improving excretion, the content of component (B) is preferably 0.1% by mass or more and 5% by mass or less, and more preferably 0.5% by mass or more and 3% by mass or less, relative to the total amount of the liquid skin cleansing agent composition. When the content of component (B) is 0.1% by mass or more relative to the total amount of the liquid skin cleansing agent composition, the discharge properties are good. When the content of component (B) is 5% by mass or less relative to the total amount of the liquid skin cleansing agent composition, the discharge properties are good.

[0036] <(C)Polyhydric alcohols with an IOB value between 3 and 5> The aforementioned (C) polyhydric alcohol with an IOB value of 3 to 5 imparts good discharge properties to the liquid skin cleansing composition.

[0037] Here, the IOB value is an index that indicates the degree of polarity of an organic compound as a balance between inorganic and organic components, and is calculated by dividing the inorganic value by the organic value. The IOB value of component (C) is preferably 3.3 or more and 5 or less from the viewpoint of good excretion performance.

[0038] There are no particular restrictions on the aforementioned (C) component, and it can be appropriately selected depending on the purpose. However, from the viewpoint of good excretion, propylene glycol (IOB value: 3.3), ethylene glycol (IOB value: 5.0), diethylene glycol (IOB value: 3.44), glycerin (IOB value: 5.0), diglycerin (IOB value: 3.5), sorbitol (IOB value: 5.0), mannitol (IOB value: 5.0), sucrose (IOB value: 3.67), and glucose (IOB value: 4.42) are preferred. Among these, propylene glycol (IOB value: 3.3), ethylene glycol (IOB value: 5.0), diethylene glycol (IOB value: 3.44), glycerin (IOB value: 5.0), and diglycerin (IOB value: 3.5) are more preferred from the viewpoint of having better discharge properties.

[0039] The aforementioned component (C) may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available products of component (C) include cosmetic glycerin (glycerin, manufactured by Miyoshi Oil & Fat Co., Ltd.) and cosmetic propylene glycol (propylene glycol, manufactured by ADEKA Corporation).

[0040] From the viewpoint of improving the absence of skin stiffness after rinsing and the ease of removal, the content of component (C) is preferably 8% by mass or more and 16% by mass or less, and more preferably 8% by mass or more and 14% by mass or less, relative to the total amount of the liquid skin cleansing agent composition. When the content of component (C) is 8% by mass or more of the total amount of the liquid skin cleansing composition, the skin does not feel squeaky after rinsing and the drainage is good. When the content of component (C) is 16% by mass or less relative to the total amount of the liquid skin cleansing agent composition, the lack of skin stiffness after rinsing is improved.

[0041] <(D) Cationic polymer containing 40 mol% or more of structural units derived from dimethyldiallylammonium chloride> The cationic polymer containing 40 mol% or more of structural units derived from (D) dimethyldiallylammonium chloride imparts a moist feeling to the liquid skin cleansing composition after rinsing.

[0042] There are no particular restrictions on the aforementioned component (D), and it can be appropriately selected depending on the purpose. Examples include dimethyldiallylammonium chloride polymer and dimethyldiallylammonium chloride-acrylic acid copolymer. Specific examples of component (D) include compounds represented by the following general formula (B1).

[0043] [ka] However, in the general formula (B1) above, n and m represent the molar ratio (mol%) of each structural unit, where n + m = 100, and it is preferable that m is 40 mol% or more.

[0044] In the dimethyldiallylammonium chloride-acrylic acid copolymer, the molar ratio of structural units derived from dimethyldiallylammonium chloride is preferably 40 mol% or more, more preferably 65 mol% or more, and even more preferably 90 mol% or more, from the viewpoint of providing a good moisturizing effect on the skin after rinsing. The dimethyldiallylammonium chloride-acrylic acid copolymer may be used alone or in combination of two or more types.

[0045] The molar ratio of each structural unit in the dimethyldiallylammonium chloride-acrylic acid copolymer can be determined by measuring it under the following measurement conditions using nuclear magnetic resonance (NMR). [Measurement conditions] Solvent: Deuterium water (D2O) Measuring instrument: JNM-LA300 (300MHz, manufactured by JEOL Ltd.)

[0046] There are no particular restrictions on the weight-average molecular weight of component (D) and it can be appropriately selected according to the purpose, but from the viewpoint of providing a good moist feeling to the skin after towel drying, it is preferably 10,000 to 1,000,000 and more preferably 15,000 to 450,000. The weight-average molecular weight of component (D) can be measured, for example, using the SEC-MALLS-RI system (measurement conditions: column: TSKgel α series α-M column 30 cm manufactured by Tosoh Corporation, solvent: 0.3 M aqueous solution of sodium nitrate).

[0047] The viscosity at 25°C of a solution containing 30% to 44% by mass of component (D) is preferably 10 mPa·s to 15,000 mPa·s, and more preferably 20 mPa·s to 12,000 mPa·s. The viscosity can be measured, for example, using a Brookfield viscometer LVF (manufactured by Brookfield).

[0048] The aforementioned component (D) may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available products of component (D) include the following, by trade name:

[0049] MERQUAT 100 (Ingredient name: Dimethyldiallylammonium chloride polymer, manufactured by Lubrizol Nippon Co., Ltd., Viscosity at 25°C with solids content of 39% to 44% by mass: 8,000 mPa·s to 12,000 mPa·s, Weight-average molecular weight: 150,000). The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield Corporation) at 25°C, with a rotor of spindle No. 3, and under conditions of 6 revolutions per minute.

[0050] Marquardt 106 (Ingredient name: Dimethyldiallylammonium chloride polymer, manufactured by Lubrizol Nippon Co., Ltd., Viscosity at 25°C with solids content of 30% to 36% by mass: 20 mPa·s to 65 mPa·s, weight-average molecular weight 15,000). The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield Corporation) at 25°C, using rotor No. 1 spindle, and at a rate of 60 revolutions per minute.

[0051] Marquardt 280 (component name: dimethyldiallylammonium chloride-acrylic acid copolymer, manufactured by Lubrizol Nippon Co., Ltd., solid content 39% to 43% by mass, viscosity at 25°C: 3,000 mPa·s to 6,000 mPa·s, weight-average molecular weight 450,000, n:m = 35:65 (molar ratio) in the above general formula (B1), molar ratio of structural units derived from dimethyldiallylammonium chloride is 65 mol). The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield Corporation) at 25°C, using a rotor with spindle No. 4, and operating at 60 revolutions per minute.

[0052] Marquardt 295 (component name: dimethyldiallylammonium chloride-acrylic acid copolymer, manufactured by Lubrizol Nippon Co., Ltd., viscosity at 25°C with solid content of 35% to 40% by mass: 3,500 mPa·s to 9,000 mPa·s, weight-average molecular weight 190,000, n:m = 5:95 (molar ratio) in the above general formula (B1), molar ratio of structural units derived from dimethyldiallylammonium chloride is 95 mol). The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield Corporation) at 25°C, with a rotor of spindle No. 4, and under conditions of 30 revolutions per minute.

[0053] There are no particular restrictions on the content of component (D) and it can be appropriately selected depending on the purpose, but from the viewpoint of preventing skin from feeling stiff after rinsing, keeping the skin moist after rinsing, and ensuring good drainage, it is preferably 0.1% by mass or more and 1% by mass or less, and more preferably 0.2% by mass or more and 0.8% by mass or less, relative to the total amount of the liquid skin cleansing agent composition. When the content of component (D) is 0.1% by mass or more relative to the total amount of the liquid skin cleansing composition, the skin feels moisturized after rinsing. When the content of component (D) is 1% by mass or less relative to the total amount of the liquid skin cleansing agent composition, the skin does not feel squeaky after rinsing and the cleansing properties are good.

[0054] <Mass ratio {(C) / (B)}> There are no particular restrictions on the ratio {(C) / (B)} of the content of component (C) to the content of component (B), and it can be appropriately selected according to the purpose. However, from the viewpoint of preventing skin from feeling stiff after rinsing and ensuring good drainage, a ratio of 1.6 to 34 is preferred, 1.6 to 32 is more preferred, and 2.7 to 28 is even more preferred. When the ratio of the content {(C) / (B)} is 1.6 or higher, the discharge performance is good. When the ratio of the contents {(C) / (B)} is 34 or less, the skin does not feel squeaky after rinsing and the excretion rate is good.

[0055] <Other ingredients> In addition to the components (A), (B), (C), and (D) described above, the liquid skin cleansing composition may contain other components as needed, provided that they do not impair the effects of the present invention. Examples of the aforementioned other components include surfactants other than component (A) and component (B), water-soluble polymers other than component (D), oils, silicones, alcohols such as lower or higher alcohols, lanolin derivatives, protein derivatives, amino acids, vitamins and other drugs, disinfectants, humectants, preservatives, pH adjusters such as potassium hydroxide, citric acid, and hydrochloric acid, antioxidants, chelating agents, ultraviolet absorbers, ultraviolet scattering agents, plant and animal extracts or derivatives thereof, chelating agents such as EDTA, dyes, fragrances, pigments, inorganic powders, clay minerals, and water-insoluble polymer compound powders such as nylon and polyethylene. These may be used individually or in combination of two or more types. The other components may be synthesized as appropriate, or commercially available products may be used. There are no particular restrictions on the content of the other components in the aforementioned liquid skin cleansing composition, and they can be appropriately selected depending on the purpose.

[0056] The aforementioned oils are not particularly limited and can be appropriately selected according to the purpose. Examples include vegetable oils and fats such as olive oil, cocoa oil, hydrogenated palm oil, camellia oil, coconut oil, wood wax, jojoba oil, grapeseed oil, and avocado oil, and their ester compounds; animal oils and fats such as mink oil and egg yolk oil; waxes such as beeswax, whale wax, lanolin, hydrogenated lanolin, carnauba wax, and candelilla wax; hydrocarbons such as liquid paraffin, squalane, microcrystalline wax, ceresin wax, paraffin wax, and petrolatum; natural and synthetic fatty acids such as oleic acid, isostearic acid, and behenic acid; and esters such as glycerol tri-2-ethylhexanoate, 2-ethylhexyl stearate, butyl stearate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, octyldodecyl oleate, and cholesterol oleate. These may be used individually or in combination of two or more types. The oil content is not particularly limited as long as it does not impair the effects of the present invention and can be appropriately selected according to the purpose, but it is preferably 0.1% by mass or more and 3% by mass or less based on the total amount of the liquid skin cleansing composition.

[0057] There are no particular restrictions on the alcohols mentioned above, and they can be appropriately selected depending on the purpose. Examples include natural and synthetic higher alcohols such as cetyl alcohol, oleyl alcohol, stearyl alcohol, hexyldecanol, octyldodecanol, and lauryl alcohol. These may be used individually or in combination of two or more types. The amount of alcohols can be selected as appropriate depending on the purpose, as long as it does not impair the effects of the present invention, but it is preferably 0.1% by mass or more and 10% by mass or less based on the total amount of the liquid skin cleansing composition.

[0058] There are no particular restrictions on the preservatives mentioned above, and they can be appropriately selected depending on the purpose. Examples include benzoates, sorbates, dehydroacetates, parahydroxybenzoates, 2,4,4′-trichloro-2′-hydroxydiphenyl ether, 3,4,4′-trichlorocarbanilide, benzalkonium chloride, hinokitiol, resorcinol, methylchloroisothiazolinone / methylisothiazolinone solution (product name: Kayson CG, manufactured by Rohm & Haas Japan), salicylic acid, pentanediol, phenoxyethanol, and ethanol. These may be used individually or in combination of two or more types. The amount 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 according to the purpose, but it is preferably 0.1% by mass or more and 1% by mass or less based on the total amount of the liquid skin cleansing composition.

[0059] The aforementioned antioxidant is not particularly limited and can be appropriately selected depending on the purpose. Examples include dibutylhydroxytoluene, butylhydroxyanisole, and ascorbic acid. These may be used individually or in combination of two or more types. 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 according to the purpose, but it is preferably 0.1% by mass or more and 1% by mass or less based on the total amount of the liquid skin cleansing composition.

[0060] The chelating agent is not particularly limited and can be appropriately selected depending on the purpose. Examples include disodium edetate, ethylenediaminetetraacetate, hexametaphosphate, and gluconic acid. These may be used individually or in combination of two or more types. 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 according to the purpose, but it is preferably 0.1% by mass or more and 1% by mass or less based on the total amount of the liquid skin cleansing composition.

[0061] The pH adjusting agent is not particularly limited and can be appropriately selected depending on the purpose. Examples include sodium hydroxide, potassium hydroxide, citric acid, succinic acid, triethanolamine, aqueous ammonia, triisopropanolamine, phosphoric acid, and glycolic acid. These may be used individually or in combination of two or more types.

[0062] The UV absorber and UV scatterer are not particularly limited and can be appropriately selected depending on the purpose. Examples include 2-hydroxy-4-methoxybenzophenone, octyldimethyl para-aminobenzoate, ethylhexyl para-methoxycinnamate, titanium dioxide, kaolin, and talc. These may be used individually or in combination of two or more types.

[0063] There are no particular restrictions on the vitamins mentioned above, and they can be appropriately selected according to the purpose. Examples include vitamin A, B vitamins, vitamin C, vitamin D, vitamin E, vitamin F, vitamin K, vitamin P, vitamin U, carnitine, ferulic acid, γ-oryzanol, α-lipoic acid, orotic acid, and their derivatives. These may be used individually or in combination of two or more types. The amount of vitamins can be appropriately selected according to the purpose, as long as it does not impair the effects of the present invention, but it is preferably 0.001% by mass or more and 0.5% by mass or less based on the total amount of the liquid skin cleansing composition.

[0064] Examples of the aforementioned amino acids include glycine, alanine, valine, leucine, isoleucine, phenylalanine, tryptophan, cystine, cysteine, methionine, proline, hydroxyproline, aspartic acid, glutamic acid, arginine, histidine, lysine, and their derivatives. These may be used individually or in combination of two or more types. 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 according to the purpose, but it is preferably 0.001% by mass or more and 0.5% by mass or less based on the total amount of the liquid skin cleansing composition.

[0065] There are no particular restrictions on the aforementioned fragrances, and they can be appropriately selected according to the purpose. For example, fragrance compositions A to D described in paragraphs

[0065] to

[0071] of Japanese Patent Publication No. 2002-128658, fragrance compositions A to E described in paragraphs

[0076] to

[0088] of Japanese Patent Publication No. 2003-73249, or blended fragrance compositions 1 to 4 described in paragraphs

[0016] to

[0023] of Japanese Patent Publication No. 2020-132680 can be used.

[0066] -pH- The pH of the liquid skin cleansing composition at 25°C is not particularly limited and can be appropriately selected depending on the purpose, but it is preferably 9.5 to 11.0 and more preferably 9.8 to 10.6. The aforementioned pH can be measured, for example, using a glass electrode color hydrogen ion concentration indicator HM-30R (electrode type GST-5721, manufactured by Toa DKK Co., Ltd.).

[0067] -viscosity- The viscosity of the liquid skin cleansing composition at 25°C is not particularly limited and can be appropriately selected depending on the purpose. However, from the viewpoint of good foam density and dispensing performance, a viscosity of 5 mPa·s to 30 mPa·s is preferred, and a viscosity of 15 mPa·s to 25 mPa·s is more preferred. There are no particular restrictions on the method for measuring the viscosity, but one example is to use a BM-type viscometer (manufactured by Tokyo Keiki Co., Ltd.) and measure the viscosity after 1 minute with a sample temperature of 25°C, a rotation speed of 60 rpm, and rotor No. 1.

[0068] - Foaming container - The aforementioned liquid skin cleansing composition is filled into a foaming container and is dispensed from the foaming container in a foamy form. In this specification, "foaming container" may be simply referred to as "container". There are no particular restrictions on the foaming container, and it can be appropriately selected from known foaming containers, such as a non-gas foaming container and an aerosol container using a propellant and a pressure-resistant container. Among these, a non-gas foaming container is preferred.

[0069] The non-gas foam dispensing container is not particularly limited as long as it can dispense the liquid skin cleansing agent composition in a foamed state by mixing it with air, and can be appropriately selected according to the purpose. Examples include a squeeze foamer container that dispenses foam by squeezing the bottle body by hand, and a pump foamer container that dispenses foam by pressing down the nozzle. Such foamer containers can be manufactured by companies such as Yamato Seikan Co., Ltd. and Yoshino Kogyosho Co., Ltd. More specifically, foamer containers described in Japanese Patent Publication No. 7-315463, Japanese Patent Publication No. 8-230961, Japanese Patent Publication No. 2005-193972, etc., can be used.

[0070] The non-gas foam dispensing container typically has a porous membrane for forming foam, and foam is formed when the liquid skin cleansing composition passes through the porous membrane. There are no particular restrictions on the material of the porous membrane, and it can be appropriately selected according to the purpose, but plastic materials such as nylon, polyester, and polyolefin are preferred.

[0071] There are no particular restrictions on the mesh of the porous membrane, and it can be appropriately selected according to the purpose, but 100 mesh or more is preferred, 100 mesh to 400 mesh is more preferred, and 200 mesh to 305 mesh is even more preferred. Furthermore, there are no particular restrictions on the number of porous membranes, and they can be appropriately selected according to the purpose, but from the viewpoint of improving foam performance, 2 to 4 membranes are preferred. More specifically, the foaming containers described in Japanese Patent Publication No. 7-315463, Japanese Patent Publication No. 8-230961, and Japanese Patent Publication No. 2005-193972 can be suitably used. For example, when using the liquid skin cleansing composition with a pump-former container having one 305-mesh porous membrane and one 200-mesh porous membrane, the viscosity of the liquid skin cleansing composition at room temperature of 25°C is preferably 30 mPa·s or less, and more preferably 25 mPa·s or less.

[0072] -Manufacturing method- There are no particular limitations on the method for producing the liquid skin cleansing composition of the present invention, and can be appropriately selected depending on the purpose. It can be obtained by mixing component (A), component (B), component (C), and component (D), the other components as needed, and purified water (added as a remainder so that the entire liquid skin cleansing composition is 100% by mass). Specifically, it can be manufactured as follows: After dissolving component (A) in purified water heated to 70°C to 80°C, it can be cooled to 40°C or below, and then components (B), (C), and (D) can be added.

[0073] The liquid skin cleansing composition may be prepared using an apparatus. The apparatus is not particularly limited and can be appropriately selected depending on the purpose. Examples include a stirring device equipped with stirring blades that have shear force and can mix the entire mixture. There are no particular restrictions on the stirring blades, and they can be appropriately selected according to the purpose. Examples include propellers, turbines, and dispersers.

[0074] -Applications- There are no particular restrictions on the site or method of use of the liquid skin cleansing composition, and it can be appropriately selected according to the purpose. For example, it can be used on the whole body, face, hands, etc., in the usual manner.

[0075] There are no particular restrictions on the use of the aforementioned liquid skin cleansing composition, and it can be appropriately selected according to the purpose. Examples include body shampoo, body soap, facial cleanser, hand soap, foaming hand soap, cleansing foam, and makeup remover. [Examples]

[0076] The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited in any way to these examples. The content of each component described in the examples and comparative examples is shown in "mass%", the total amount is 100 mass%, and all values ​​are calculated on a pure content basis.

[0077] (Examples 1-39 and Comparative Examples 1-9) Liquid skin cleansing compositions with the compositions and contents shown in Examples 1-39 and Comparative Examples 1-9 were prepared according to the following method. Specifically, 95% by mass of purified water of the final liquid skin cleansing composition was heated to 70°C-80°C to dissolve component (A), then cooled to below 40°C, and components (B), (C), and (D), and other components as needed were added. Then, purified water was added until the total volume reached 100% by mass to obtain each liquid skin cleansing composition. Furthermore, a propeller was used as the stirring blade, and stirring was performed using a Three One Motor (HEIDON BL1200, manufactured by Shinto Chemical Co., Ltd.). The pH was measured at 25°C using a pH meter (HM-30R, manufactured by TOA DKK). Furthermore, the liquid skin cleansing compositions obtained from Examples 1 to 39 and Comparative Examples 1 to 9 were filled into containers with foam pump dispensers [discharge volume 3 mL, manufactured by Yoshino Kogyosho Co., Ltd.].

[0078] For each liquid skin cleansing composition, the following were evaluated and judged: "density of foam," "lack of skin stiffness after rinsing," "ease of discharge," and "skin moisturizing effect after towel drying." The results are shown in Tables 1 to 8 below.

[0079] <Evaluation of foam density> Ten expert evaluators took one pump (approximately 3g) of each liquid skin cleansing composition from its container, and observed the density (elasticity) of the foam when washing the inner part of their forearms. They evaluated the composition based on the evaluation criteria below. The results were determined by calculating the average score of the ten expert evaluators and judging the composition based on the evaluation criteria below. A score of "○" or higher was considered a pass. -Evaluation Criteria- 5 points: The foam has excellent elasticity. 4 points: The foam has elasticity. 3 points: The foam has a slight elasticity. 2 points; the foam has almost no elasticity. 1 point: The foam lacks elasticity. -Judgment criteria- ◎: 4.0 points or more and 5.0 points or less ○: 3.0 points or higher, less than 4.0 points △: 2.0 points or more, less than 3.0 points ×: Less than 2.0 points

[0080] <Evaluation of skin's lack of tightness after rinsing> Ten expert evaluators dispensed one pump (approximately 3g) of each liquid skin cleanser composition from its container into their hands and applied it to the skin on the inner side of their forearms with 10 back-and-forth strokes. The areas where each liquid skin cleanser composition was applied were rinsed with warm water at approximately 40°C, and the resulting skin tightness was evaluated based on the following criteria. The average of the ten expert evaluators' scores was calculated and judged according to the following criteria. A score of "○" or higher was considered a pass. -Evaluation Criteria- 5 points: My skin doesn't feel tight at all. 4 points: My skin hardly feels tight. 3 points: My skin feels a little tight. 2 points; skin feels tight. 1 point: My skin feels very tight. -Judgment criteria- ◎: 4.0 points or more and 5.0 points or less ○: 3.0 points or higher, less than 4.0 points △: 2.0 points or more, less than 3.0 points ×: Less than 2.0 points

[0081] <Evaluation of discharge capacity> One g of each liquid skin cleansing composition was measured out and placed in a plastic petri dish. After standing in a constant temperature bath at 40°C and 40% humidity for two hours, the gel state was evaluated according to the evaluation criteria below. The average score of 10 expert evaluators was calculated and judged according to the judgment criteria below. A score of "○" or higher was considered a pass. -Evaluation Criteria- 4 points: The gel is very soft. 3 points: The gel is soft. 2 points: The gel is a little hard. 1 point: The gel is hard. -Judgment criteria- ◎: 3.5 points or more and 4.0 points or less ○: 3.0 points or higher, less than 3.5 points △: 2.0 points or more, less than 3.0 points ×: Less than 2.0 points

[0082] <Evaluation of skin's moisture level after towel-drying> Ten expert evaluators dispensed one pump (approximately 3g) of each liquid skin cleanser composition from its container into their hands and applied it to the skin on the inner side of their forearms with 10 back-and-forth strokes. The areas where each liquid skin cleanser composition was applied were then rinsed with warm water at approximately 40°C. After towel-drying, the skin was left to rest for 8 hours in a 25°C constant temperature room. The "moisture level of the skin" was then evaluated based on the following evaluation criteria. The results were determined by calculating the average score of the ten expert evaluators and judging based on the following criteria for the average score. A score of "○" or higher was considered a pass. -Evaluation Criteria- 4 points: Very moisturizing. 3 points: Has a moist feel. 2 points: It has a slightly moist feel. 1 point: It doesn't feel moisturizing. -Judgment criteria- ◎: 3.5 points or more and 4.0 points or less ○: 3.0 points or higher, less than 3.5 points △: 2.0 points or more, less than 3.0 points ×: Less than 2.0 points

[0083] [Table 1]

[0084] [Table 2]

[0085] [Table 3]

[0086] [Table 4]

[0087] [Table 5]

[0088] [Table 6]

[0089] [Table 7]

[0090] [Table 8]

[0091] Details of each component used in Examples 1-39 and Comparative Examples 1-9 are shown in Table 9 below.

[0092] [Table 9] *Component (A) was prepared by neutralizing the above components with potassium hydroxide (liquid caustic potash, manufactured by Asahi Glass Co., Ltd.). [Industrial applicability]

[0093] The aforementioned liquid skin cleansing composition is excellent in terms of foam density, the absence of skin stiffness after rinsing, and ease of discharge from the container. Therefore, it can be used in products such as body shampoo, body soap, facial cleanser, hand soap, foaming hand soap, cleansing foam, and makeup remover, and is particularly suitable for use in body soap.

Claims

1. (A) A higher fatty acid salt with 12 to 20 carbon atoms, (B) One or more selected from alkyl sulfosuccinates, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan fatty acid esters, sorbitan fatty acid esters, and N-acyl glutamic acid or salts thereof, (C) Polyhydric alcohols with an IOB value of 3 or more and 5 or less, A liquid skin cleansing composition containing, The content of component (A) is 18% by mass or more and 25% by mass or less based on the total amount of the liquid skin cleansing composition. The aforementioned component (A) contains stearate, and the amount of stearate is 0.8% by mass or more and 2% by mass or less based on the total amount of the liquid skin cleansing composition. A liquid skin cleansing composition characterized by being filled into a foaming container.

2. The liquid skin cleansing composition according to claim 1, wherein the ratio of the content of component (C) to the content of component (B) {(C) / (B)} is 2.7 or more and 28 or less.

3. The content of component (B) is 0.5% by mass or more and 3% by mass or less based on the total amount of the liquid skin cleansing composition. The liquid skin cleansing composition according to claim 1 or 2, wherein the content of component (C) is 8% by mass or more and 14% by mass or less based on the total amount of the liquid skin cleansing composition.

4. (D) A liquid skin cleansing composition according to claim 1 or 2, comprising a cationic polymer containing 40 mol% or more of structural units derived from dimethyldiallylammonium chloride.

5. The liquid skin cleansing composition according to claim 4, wherein the content of component (D) is 0.2% by mass or more and 0.8% by mass or less based on the total amount of the liquid skin cleansing composition.

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