Liquid skin cleansing composition

Abstract

To provide a liquid skin detergent composition having high moisturizing power to the skin after towel drying.SOLUTION: (A) at least one selected from the group consisting of hydrolyzed collagen and hydrolyzed silk.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a liquid skin cleanser composition. [Background technology]

[0002] Conventionally, skin cleansing compositions such as body soaps have tended to be required to have good foaming properties and a refreshing feeling after cleansing. However, in recent years, there has been growing demand and interest in high moisturizing power for the skin after towel drying.

[0003] As a conventional technique, for example, a skin cleanser composition containing a higher fatty acid has been proposed for the purpose of providing a skin cleanser composition that provides sufficient foaming during cleansing and leaves the skin feeling moisturized after cleansing (see Patent Document 1).

[0004] However, when an oil-soluble component is added to improve the moisturizing power of the skin after towel drying, there is a problem in that the quality of the foam during cleansing deteriorates.

[0005] Therefore, there is a need for a skin cleanser composition that can provide both high moisturizing power to the skin after towel drying and excellent foam quality during cleansing. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2021-75481 Summary of the Invention [Problem to be solved by the invention]

[0007] An object of one aspect of the present invention is to solve the above-mentioned problems of the prior art and to achieve the following object: That is, an object of one aspect of the present invention is to provide a liquid skin cleanser composition that has high moisturizing power for the skin after towel drying. [Means for solving the problem]

[0008] One aspect of the present invention is based on the findings of the present inventors, and means for solving the problems are as follows, for example. <1> (A) A liquid skin cleansing composition containing at least one selected from hydrolyzed collagen and hydrolyzed silk. <2> (B) an anionic surfactant; (C) at least one cationic polymer selected from a dimethyldiallylammonium chloride polymer and a dimethyldiallylammonium chloride-acrylic acid copolymer; containing <1> The liquid skin cleanser composition according to claim 1. [Effects of the Invention]

[0009] According to one aspect of the present invention, a liquid skin cleanser composition having high moisturizing power for the skin after towel drying can be provided. DETAILED DESCRIPTION OF THE INVENTION

[0010] (Liquid skin cleanser composition) A liquid skin cleanser composition according to one embodiment of the present invention preferably contains (A) at least one selected from hydrolyzed collagen and hydrolyzed silk, (B) an anionic surfactant, and (C) at least one cationic polymer selected from dimethyldiallylammonium chloride polymer and dimethyldiallylammonium chloride-acrylic acid copolymer, and may contain other components as necessary.

[0011] In this specification, "(A) at least one selected from hydrolyzed collagen and hydrolyzed silk" may be referred to as "(A)" or "(A) component," "(B) anionic surfactant" may be referred to as "(B)" or "(B) component," and "(C) at least one cationic polymer selected from dimethyldiallylammonium chloride polymer and dimethyldiallylammonium chloride-acrylic acid copolymer" may be referred to as "(C)" or "(C) component."

[0012] <Component (A)> Component (A) imparts to the liquid skin cleanser composition a high moisturizing effect to the skin after towel drying.

[0013] The component (A) is at least one selected from hydrolyzed collagen and hydrolyzed silk. These may be used alone or in combination of two or more. It is preferable to use hydrolyzed collagen and hydrolyzed silk in combination, as this provides a more excellent moisturizing feeling to the skin after towel drying.

[0014] The content of component (A) is not particularly limited and can be selected appropriately depending on the purpose, but is preferably from 0.001% to 5% by mass, and more preferably from 0.002% to 2% by mass, from the viewpoint of providing an excellent moisturizing feel to the skin after towel drying and smoothness during rinsing. A content of component (A) of 0.001% by mass or more provides an excellent moisturizing feel to the skin after towel drying, and a content of 5% by mass or less provides an excellent smoothness during rinsing.

[0015] The component (A) may be either a synthetic product or a commercially available product, such as Promois WU-32R (Seiwa Kasei Co., Ltd., hydrolyzed collagen with a solid content of 30% by mass) or Silkgen G Soluble S30B(N) (Ichimaru Pharcos Co., Ltd., hydrolyzed silk with a solid content of 5.5% by mass).

[0016] <(B) component> Component (B) imparts good foam density to the liquid skin cleanser composition. Note that a combination of components (A) and (B) is preferred because it can achieve both high moisturizing power for the skin after towel drying and excellent foam quality during cleansing.

[0017] Component (B) is an anionic surfactant, and there are no particular limitations on the anionic surfactant, which can be selected appropriately depending on the purpose, but from the viewpoint of achieving good foam density, fatty acid salts including laurate, alkyl sulfates, and polyoxyethylene (POE) alkyl ether sulfates are preferred, and fatty acid salts including laurate are more preferred. These may be used alone or in combination of two or more.

[0018] -Fatty acid salts- The fatty acid salt is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include laurate, myristate, palmitate, and stearate. These may be used alone or in combination of two or more. When two or more are used in combination, it is preferable to contain at least a laurate salt from the viewpoint of improving foam density. In other words, it is preferable that the fatty acid contains a laurate salt and one or more selected from a myristate salt, a palmitate salt, and a stearate salt. It is preferable that the fatty acid salt does not contain an unsaturated fatty acid or a salt thereof.

[0019] The counter ion in the fatty acid salt is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include alkali metal salts, amine salts, and amino acid salts. The alkali metal salt is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include sodium salts and potassium salts. The amine salt is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include ammonium salts; monoethanolamine salts, diethanolamine salts, triethanolamine salts, and alkanolamine salts such as 2-amino-2-methylpropanol and 2-amino-2-methylpropanediol. The amino acid salt is not particularly limited and can be appropriately selected depending on the purpose. Examples include lysine salt and arginine salt. Among these, alkali metal salts are preferred, and potassium salts are more preferred.

[0020] The fatty acid salt can be blended as a fatty acid salt, but the fatty acid and a salt serving as a counter ion may be added separately to a blending tank and subjected to a neutralization reaction to form the fatty acid salt.

[0021] The fatty acids used to prepare the fatty acid salts may be appropriately synthesized or commercially available products. Examples of commercially available fatty acids include NAA (registered trademark)-122 (lauric acid, manufactured by NOF Corporation), NAA (registered trademark)-142 (myristic acid, manufactured by NOF Corporation), NAA (registered trademark)-160 (palmitic acid, manufactured by NOF Corporation), and NAA (registered trademark)-180 (stearic acid, manufactured by NOF Corporation).

[0022] The fatty acid salt may be appropriately synthesized or may be a commercially available product. Examples of commercially available fatty acid salts include, by trade name, NIKKOL potassium laurate LK-120 (potassium laurate, manufactured by Nikko Chemicals Co., Ltd.), NIKKOL potassium myristate MK-140 (potassium myristate, manufactured by Nikko Chemicals Co., Ltd.), NON-SAL PK-1 (potassium palmitate, manufactured by NOF Corporation), NON-SAL SK-1 (potassium stearate, manufactured by NOF Corporation), and TYSOAP MNK-40 (liquid blend of potassium coconut oil fatty acid and potassium myristate, manufactured by Nikko Chemicals Co., Ltd.).

[0023] -Alkyl sulfate- The alkyl sulfate is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include compounds represented by the following general formula (A2). R2OSO3M2...General formula (A2) (In the general formula (A2), R2 represents an alkyl group having 10 to 18 carbon atoms, and M2 represents any one of an alkali metal, ammonium, and alkanolamine.)

[0024] Specific examples of alkyl sulfates include lauryl sulfate and coco alkyl sulfate.

[0025] The alkyl sulfate may be suitably synthesized or may be a commercially available product, such as Texapon ALS 70 (ammonium lauryl sulfate, manufactured by BASF) or Texapon K12 (sodium lauryl sulfate, manufactured by BASF).

[0026] -Polyoxyethylene (POE) alkyl ether sulfate- The polyoxyethylene alkyl ether sulfate is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include compounds represented by the following general formula (A1): The polyoxyethylene alkyl ether sulfate may be used alone or in combination of two or more.

[0027] [ka]

[0028] In general formula (A1), R 7 represents an alkyl group. The alkyl group preferably has 10 to 14 carbon atoms. In the general formula (A1), n ​​represents the average number of moles of ethylene oxide (EO) added, and the average number of moles of ethylene oxide added is preferably 1 to 5. In the general formula (A1), X represents an alkali metal or ammonium. The alkali metal is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include sodium and potassium.

[0029] Specific examples of polyoxyethylene alkyl ether sulfates include polyoxyethylene capryl ether sulfates (EO: 1-3), polyoxyethylene lauryl ether sulfates (EO: 1-3), polyoxyethylene myristyl ether sulfates (EO: 1-3), polyoxyethylene palmityl ether sulfates (EO: 1-3), and polyoxyethylene stearyl ether sulfates (EO: 1-3).

[0030] The polyoxyethylene alkyl ether sulfate may be suitably synthesized or may be a commercially available product. Commercially available polyoxyethylene alkyl ether sulfates include, for example, trade names such as Emal 170J (polyoxyethylene lauryl ether sodium sulfate, EO:1, manufactured by Kao Corporation), Shinorine SPE-1250 (polyoxyethylene lauryl ether sodium sulfate, EO:2, manufactured by New Japan Chemical Co., Ltd.), Emal 20T (polyoxyethylene lauryl ether triethanolamine sulfate, EO:3, manufactured by Kao Corporation), and Teikapol NE1270 (polyoxyethylene lauryl ether ammonium sulfate, EO:3, manufactured by Teika Corporation).

[0031] The content of component (B) is not particularly limited and can be selected appropriately depending on the purpose, but from the viewpoint of achieving good foam density and smoothness during rinsing, it is preferably from 5 to 25% by mass, and more preferably from 10 to 25% by mass, relative to the total amount of the liquid skin cleanser composition. A content of component (B) of 5% by mass or more will result in excellent foam density, and a content of 25% by mass or less will result in excellent smoothness during rinsing.

[0032] <(C) component> Component (C) imparts to the liquid skin cleanser composition a high moisturizing effect to the skin after towel drying.

[0033] The component (C) is not particularly limited and can be appropriately selected depending on the purpose. Examples include cationic polymers containing 40 mol% or more of structural units derived from dimethyldiallylammonium chloride. Among these, dimethyldiallylammonium chloride polymers and dimethyldiallylammonium chloride-acrylic acid copolymers are mentioned. Specific examples of the component (C) include compounds represented by the following general formula (B1):

[0034] [ka] In general formula (B1), n ​​and m represent the molar ratio (mol %) of each structural unit, and it is preferable that n+m=100, and m is 40 mol % or more.

[0035] The molar ratio of structural units derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer 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 feeling to the skin after towel drying. The dimethyldiallylammonium chloride-acrylic acid copolymer may be used alone or in combination of two or more kinds.

[0036] The molar ratio of each structural unit in the dimethyldiallylammonium chloride-acrylic acid copolymer can be determined by measuring by nuclear magnetic resonance (NMR) under the following measurement conditions. [Measurement conditions] Solvent: Deuterium oxide (DO) Measuring instrument: JNM-LA300 (300MHz, manufactured by JEOL Ltd.)

[0037] The weight average molecular weight of component (C) is not particularly limited and can be selected appropriately depending on the purpose, but from the viewpoint of providing a good moist feeling on the skin after towel drying, it is preferably 10,000 or more and 1,000,000 or less, and more preferably 15,000 or more and 450,000 or less. The weight average molecular weight of component (C) can be measured, for example, using a SEC-MALLS-RI system (measurement conditions: column: TSKgel α series α-M column 30 cm manufactured by Tosoh Corporation, solvent: 0.3 M aqueous sodium nitrate solution).

[0038] The viscosity of a solution of component (C) with a solids content of 30 to 44% by mass at 25°C is preferably 10 to 15,000 mPa·s, more preferably 20 to 12,000 mPa·s. The viscosity can be measured, for example, using a Brookfield viscometer LVF (manufactured by Brookfield).

[0039] The component (C) may be either an appropriately synthesized product or a commercially available product. Examples of commercially available products of the component (C) include the following products under their trade names:

[0040] MERQUAT 100 (component name: dimethyldiallylammonium chloride polymer, manufactured by Lubrizol Japan, solids content 39% to 44% by mass, viscosity at 25°C: 8,000 mPa·s to 12,000 mPa·s, weight average molecular weight: 150,000). The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25° C. with a spindle No. 3 rotor at 6 revolutions per minute.

[0041] Marcote 106 (component name: dimethyldiallylammonium chloride polymer, manufactured by Lubrizol Japan, solid content 30% to 36% by mass, viscosity at 25°C: 20 mPa·s to 65 mPa·s, weight average molecular weight: 15,000). The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25° C. with a rotor of spindle No. 1 at 60 rpm.

[0042] Merquat 280 (component name: dimethyldiallylammonium chloride-acrylic acid copolymer, manufactured by Lubrizol Japan Corporation, 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 general formula (B1), molar ratio of structural units derived from dimethyldiallylammonium chloride 65% by mole). The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25° C. with a spindle No. 4 rotor at 60 rpm.

[0043] Merquat 295 (component name: dimethyldiallylammonium chloride-acrylic acid copolymer, manufactured by Lubrizol Japan Corporation, solid content 35% to 40% by mass, viscosity at 25°C: 3,500 mPa·s to 9,000 mPa·s, weight-average molecular weight: 190,000, n:m = 5:95 (molar ratio) in general formula (B1), molar ratio of structural units derived from dimethyldiallylammonium chloride 95% by mole). The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield) at 25° C. with a spindle No. 4 rotor at 30 rpm.

[0044] The content of component (C) is not particularly limited and can be selected appropriately depending on the purpose, but from the viewpoint of improving the moisturizing feeling of the skin after towel drying and improving smoothness during rinsing, it is preferably from 0.1 to 1% by mass, and more preferably from 0.1 to 0.8% by mass, based on the total amount of the liquid skin cleanser composition. A content of component (C) of 0.1% by mass or more improves the moisturizing feeling of the skin after towel drying, and a content of 1% by mass or less improves smoothness during rinsing.

[0045] <Other ingredients> In addition to the components (A), (B), and (C), the liquid skin cleanser composition may contain other components as needed, provided that the effects of the liquid skin cleanser composition according to one embodiment of the present invention are not impaired. Examples of other components include surfactants other than component (B), water-soluble polymers other than components (A) and (C), oils, silicones, alcohols such as lower or higher alcohols, lanolin derivatives, protein derivatives, amino acids, vitamins and other pharmaceuticals, disinfectants, moisturizers, preservatives, pH adjusters such as potassium hydroxide, citric acid, hydrochloric acid and the like, antioxidants, sequestering agents, UV absorbers, UV scattering agents, animal and plant extracts or derivatives thereof, chelating agents such as edetic acid, colorants, fragrances, pigments, inorganic powders, clay minerals, water-insoluble polymer compound powders such as nylon and polyethylene, and the like. These may be used alone or in combination of two or more. The other components may be appropriately synthesized or commercially available. The content of other components in the liquid skin cleanser composition is not particularly limited and can be appropriately selected depending on the purpose.

[0046] The oil is not particularly limited and can be appropriately selected depending on the purpose. Examples include vegetable oils and fats such as castor oil, olive oil, cacao oil, hardened palm oil, camellia oil, coconut oil, Japan wax, jojoba oil, grapeseed oil, and avocado oil, and ester compounds thereof; animal oils and fats such as mink oil and egg yolk oil; waxes such as beeswax, spermaceti, lanolin, hydrogenated lanolin, carnauba wax, and candelilla wax; hydrocarbons such as liquid paraffin, squalane, microcrystalline wax, ceresin wax, paraffin wax, and petrolatum; natural and synthetic fatty acids such as oleic acid, isostearic acid, and behenic acid; and esters such as glycerol tri-2-ethylhexanoate, 2-ethylhexyl stearate, butyl stearate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, octyldodecyl oleate, and cholesterol oleate. These may be used alone or in combination of two or more. The oil content is not particularly limited and can be selected appropriately 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 3% by mass or less based on the total amount of the liquid skin cleanser composition.

[0047] The alcohols are not particularly limited and 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 alone or in combination of two or more. The content of alcohols is not particularly limited and can be selected appropriately 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 cleanser composition.

[0048] The moisturizer is not particularly limited and can be appropriately selected depending on the purpose. Examples include isoprene glycol, 1,2-pentanediol, diethylene glycol, diethylene glycol monoalkyl ether, polypropylene glycol, hydrogenated castor oil (30 E.O.), diglycerin, triglycerin, and polyglycerins. These may be used alone or in combination of two or more.

[0049] The preservative is not particularly limited and can be selected appropriately 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 (trade name: Cason CG, manufactured by Rohm and Haas Japan), salicylic acid, pentanediol, phenoxyethanol, and ethanol. These may be used alone or in combination of two or more. The content of the preservative is not particularly limited and can be selected appropriately 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 1% by mass or less based on the total amount of the liquid skin cleanser composition.

[0050] The antioxidant is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include dibutylhydroxytoluene, butylhydroxyanisole, and ascorbic acid. These may be used alone or in combination of two or more. The content of the antioxidant is not particularly limited and can be selected appropriately 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 1% by mass or less based on the total amount of the liquid skin cleanser composition.

[0051] The chelating agent is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include disodium edetate, 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 and can be selected appropriately 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 1% by mass or less based on the total amount of the liquid skin cleanser composition.

[0052] The pH adjuster 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, glycolic acid, etc. These may be used alone or in combination of two or more.

[0053] The ultraviolet absorber and ultraviolet scattering agent are not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include 2-hydroxy-4-methoxybenzophenone, octyl dimethyl paraaminobenzoate, ethylhexyl paramethoxycinnamate, titanium oxide, kaolin, and talc. These may be used alone or in combination of two or more.

[0054] The vitamins are not particularly limited and can be appropriately selected depending on the purpose. Examples of vitamins include vitamin A, B vitamins, vitamin C, vitamin D, vitamin E, vitamin F, vitamin K, vitamin P, vitamin U, carnitine, ferulic acid, γ-oryzanol, α-lipoic acid, orotic acid, and derivatives thereof. These may be used alone or in combination of two or more. The content of vitamins is not particularly limited and can be selected appropriately depending on 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 relative to the total amount of the liquid skin cleanser composition.

[0055] Examples of 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 amino acids is not particularly limited and can be selected appropriately depending on 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 relative to the total amount of the liquid skin cleanser composition.

[0056] The fragrance is not particularly limited and can be selected appropriately depending on the purpose. For example, fragrance compositions A to D described in paragraphs

[0065] to

[0071] of JP 2002-128658 A, fragrance compositions A to E described in paragraphs

[0076] to

[0088] of JP 2003-73249 A, or blended fragrance compositions 1 to 4 described in paragraphs

[0016] to

[0023] of JP 2020-132680 A can be used.

[0057] -pH- The pH of the liquid skin cleanser composition at 25°C is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 9.5 or more and 11.0 or less, more preferably 9.8 or more and 10.6 or less. The pH can be measured, for example, using a glass electrode color hydrogen ion concentration indicator HM-30R (manufactured by DKK-TOA Corporation, electrode type GST-5721).

[0058] -viscosity- The viscosity of the liquid skin cleanser composition at 25°C is not particularly limited and can be appropriately selected depending on the purpose. From the viewpoints of foam density and good dischargeability from the container, the viscosity is preferably from 5 mPa·s to 30 mPa·s, and more preferably from 15 mPa·s to 25 mPa·s. There are no particular limitations on the method for measuring viscosity, but examples include a method in which the viscosity is measured after 1 minute using a BM type viscometer (manufactured by Tokyo Keiki Co., Ltd.) at a sample temperature of 25°C, a rotation speed of 60 rpm, and a No. 1 rotor.

[0059] -Former container- The liquid skin cleanser composition is filled in a former container and discharged from the former container in the form of foam. In this specification, the "former container" may be simply referred to as the "container." The foamer container is not particularly limited and can be appropriately selected from known foamer containers, for example, non-gas foamer containers, aerosol containers using a propellant and a pressure-resistant container, etc. Among these, non-gas foamer containers are preferred.

[0060] The non-gas foam-dispensing container is not particularly limited and can be appropriately selected depending on the purpose, as long as it can mix the liquid skin cleanser composition with air and dispense it in a foamed state. Examples include a squeeze foamer container that can dispense foam by manually squeezing the bottle body, and a pump foamer container that can dispense foam by pressing down the nozzle. Examples of such foamer containers that can be used include those manufactured by Yamato Seikan Co., Ltd. and Yoshino Kogyosho Co., Ltd. More specifically, examples of foamer containers that can be used include those described in JP-A-7-315463, JP-A-8-230961, JP-A-2005-193972, etc.

[0061] Non-gas type foam-discharging containers usually have a porous membrane for forming foam, and foam is formed when the liquid skin cleanser composition passes through the porous membrane. The material of the porous membrane is not particularly limited and can be appropriately selected depending on the purpose, but plastic materials such as nylon, polyester, polyolefin, etc. are preferred.

[0062] The mesh of the porous membrane 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 even more preferably 200 mesh to 305 mesh. The number of porous membrane bodies is not particularly limited and can be appropriately selected depending on the purpose, but from the viewpoint of improving foam performance, it is preferably 2 to 4. More specifically, the foamer containers described in JP-A-7-315463, JP-A-8-230961, and JP-A-2005-193972 can be suitably used. For example, when the liquid skin cleanser composition is used using a pump former container having one 305-mesh porous membrane and one 200-mesh porous membrane, the viscosity of the liquid skin cleanser composition at room temperature of 25°C is preferably 30 mPa·s or less, and more preferably 25 mPa·s or less.

[0063] -Manufacturing method- The method for producing the liquid skin cleanser composition of the present invention is not particularly limited and can be appropriately selected depending on the purpose. The composition can be obtained by mixing component (A), component (B), and component (C), as well as other components as necessary, and purified water (blended as the remainder so that the total liquid skin cleanser composition is 100% by mass). Specifically, it can be produced as follows: Component (A) is dissolved in purified water heated to 70 to 80°C, and then the mixture is cooled to 40°C or below, and then components (B) and (C) are added.

[0064] The liquid skin cleanser composition may be prepared using an apparatus that is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include a stirring apparatus equipped with stirring blades that exert shear force and can mix the entire composition. The stirring blade is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include a propeller, a turbine, and a disperser.

[0065] -Applications- The area and method of application of the liquid skin cleanser composition are not particularly limited and can be appropriately selected depending on the purpose. For example, it can be used on the whole body, face, hands, etc. in the usual manner.

[0066] The use of the liquid skin cleanser composition is not particularly limited and can be appropriately selected depending on the purpose. Examples include body shampoo, body soap, facial cleanser, hand soap, foaming hand soap, cleansing foam, and makeup remover. [Example]

[0067] The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to these examples. The content of each component described in the examples and comparative examples is shown in "% by mass", the total amount is 100% by mass, and all values ​​are converted to pure contents.

[0068] (Examples 1 to 16) In Examples 1 to 16, liquid skin cleanser compositions having the compositions and contents shown in Tables 1 to 4 were prepared according to the following method. Specifically, purified water containing 95% by mass of the final liquid skin cleanser composition was heated to 70 to 80°C, component (B) was dissolved, and the mixture was cooled to 40°C or below, followed by the addition of components (A), (C), and other components. If the pH was not sufficient, potassium hydroxide, another component, was added to adjust the pH to 10.0, and purified water was added to bring the total volume to 100% by mass, thereby obtaining each liquid skin cleanser composition. A propeller was used as the stirring blade, and stirring was carried out 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). The obtained liquid skin cleansing compositions of Examples 1 to 16 were filled into a container equipped with a foamer pump dispenser [discharge volume 3 mL, manufactured by Yoshino Kogyosho Co., Ltd.].

[0069] Each liquid skin cleanser composition was evaluated and judged for "skin moisturizing feeling after towel drying," "lather density," and "smoothness during rinsing" as follows. The results are shown in Tables 1 to 4 below.

[0070] <Evaluation of moisturizing sensation on skin after towel drying> Ten expert evaluators took one pump (approximately 3 g) of each liquid skin cleanser composition from the container into their hand and applied it to the skin on the inside of their forearm in a back-and-forth motion 10 times. The area where each liquid skin cleanser composition was applied was rinsed with warm water at 40°C, towel-dried, and then left to rest in a thermostatic chamber at 25°C for 8 hours, and the "moisturizing feeling of the skin after towel-drying" was evaluated based on the following evaluation criteria. The results were calculated by calculating the average score of the 10 expert evaluators, and judged based on the following evaluation criteria for the average score. -Evaluation criteria- 4 points: Very moist feeling 3 points: Feels moist 2 points: Slightly moist feeling 1 point: Not very moisturizing -Judgment criteria- ◎: 3.5 points or more and 4.0 points or less ○: 3.0 points or more and less than 3.5 points △: 2.0 points or more and less than 3.0 points ×: Less than 2.0 points

[0071] <Evaluation of foam density> Ten expert evaluators took one pump (approximately 3 g) of each liquid skin cleanser composition from the container into their hands, observed the foam elasticity when washing the inside of their forearms, and evaluated the results based on the following evaluation criteria. The results were calculated by calculating the average score of the 10 expert evaluators and judging based on the following criteria for judging the average score. -Evaluation criteria- 5 points: The foam is very elastic 4 points: The foam is elastic 3 points: The foam is somewhat elastic 2 points: The foam is not very elastic 1 point: The foam has almost no elasticity -Judgment criteria- ◎: 4.0 points or more and 5.0 points or less ○: 3.0 points or more and less than 4.0 points △: 2.0 points or more and less than 3.0 points ×: Less than 2.0 points

[0072] <Evaluation of smoothness during rinsing> Ten expert evaluators took one pump (approximately 3 g) of each liquid skin cleanser composition from the container into their hand, rubbed the inside of their forearm four times, and then when rinsing the liquid skin cleanser composition with warm water at 40° C., evaluated the smoothness during rinsing according to the following evaluation criteria. The results were calculated by calculating the average score of the 10 expert evaluators and judging based on the following criteria for judging the average score. -Evaluation criteria- 4 points: Very smooth 3 points: Quite smooth 2 points: Slightly smooth 1 point: Not smooth -Judgment criteria- ◎: 3.5 points or more and 4.0 points or less ○: 3.0 points or more and less than 3.5 points △: 2.0 points or more and less than 3.0 points ×: Less than 2.0 points

[0073] [Table 1]

[0074] [Table 2]

[0075] [Table 3]

[0076] [Table 4]

[0077] (Prescription Examples 1-16) Liquid skin cleansing compositions having the compositions and contents shown in Tables 5 to 8 below were prepared in the same manner as in Example 1.

[0078] [Table 5]

[0079] [Table 6]

[0080] [Table 7]

[0081] [Table 8]

[0082] Details of each component used in Examples 1 to 16 and Formulation Examples 1 to 16 are shown in Table 9 below.

[0083] [Table 9]

[0084] Although all of the requirements of the present invention are essential for solving the problems of the present invention with the solutions of the present invention, the description in this specification does not suggest that the requirements of the present invention are essential for solving problems other than the problems of the present invention or for solving the problems of the present invention with solutions other than the solutions of the present invention. For example, the description in this specification does not deny that a liquid skin cleanser composition excluding any of the requirements of the present invention as set forth in the claims solves problems other than the problems of the present invention or solves the problems of the present invention with solutions other than the solutions of the present invention. [Industrial Applicability]

[0085] The liquid skin cleanser composition has excellent foam density, high moisturizing power for the skin after towel drying, and smoothness during rinsing, and can be used, for example, in body shampoos, body soaps, facial cleansing foams, hand soaps, foaming hand soaps, cleansing foams, makeup removers, and the like, and is particularly suitable for use in body soaps.

Claims

1. (A) A liquid skin cleanser composition containing at least one selected from hydrolyzed collagen and hydrolyzed silk.

2. (B) an anionic surfactant; (C) at least one cationic polymer selected from a dimethyldiallylammonium chloride polymer and a dimethyldiallylammonium chloride-acrylic acid copolymer; The liquid skin cleanser composition according to claim 1, comprising:

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