Hair cleansing composition

Abstract

To provide a hair detergent composition which is excellent in storage stability while containing an oily component, has good foaming properties during shampooing, and is excellent in smoothness during rinsing.SOLUTION: A hair cleansing composition comprising the following components (A) to (E): (A) a sulfuric acid-based anionic surfactant, (B) a glyceryl monofatty acid, (C) a fatty acid, (D) a higher alcohol, and (E) an oily component that is liquid at 25 °C.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a hair wash composition. [Background technology]

[0002] In addition to the basic function of removing dirt from hair, hair wash compositions are also required to have good foaming properties during hair washing, excellent smoothness during rinsing, and good storage stability. For example, Patent Document 1 describes a hair conditioning shampoo containing a cleansing surfactant such as an anionic surfactant, a fatty compound selected from the group consisting of a fatty alcohol, a fatty acid, a fatty alcohol derivative, a fatty acid derivative, and a mixture thereof, a hair conditioning agent, and water, and discloses that the single composition can both cleanse and condition hair. Patent Document 2 describes a thick cleansing composition containing a surfactant such as an anionic surfactant, an aliphatic compound selected from a long-chain fatty acid acyl acidic amino acid ester, a fatty acid, a fatty alcohol, a fatty alcohol ether, and a polyhydric fatty acid ester, and a solvent such as water, and discloses that the viscosity of the formulation can be stably maintained, and when used, the composition is easy to spread, foams quickly, and produces excellent foam quality. Patent Document 3 describes a silicone-free composition for keratin fibers, which is an O / W emulsion type composition in which oil droplets are dispersed in an aqueous phase, and which contains a surfactant such as an anionic surfactant and a non-silicone oil, and discloses that the composition not only has a transparent or translucent appearance but also can impart a good feel to hair. Patent Document 4 describes a cleanser containing an oily ingredient, an anionic surfactant, and a specific monoglycerin fatty acid ester, with the anionic surfactant and monoglycerin fatty acid ester blended in a specific mass ratio, and discloses that the cleanser can give hair a moist feel, manageability, and smooth combability. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 11-513687 [Patent Document 2] Special Publication No. 2013-544246 [Patent Document 3] Japanese Patent Application Publication No. 2019-014679 [Patent Document 4] Japanese Patent Publication No. 2022-058282 Summary of the Invention [Problem to be solved by the invention]

[0004] In addition to surfactants that impart cleansing properties, hair wash compositions may contain oily components that provide hair care effects and a favorable impression, such as smoothness during hair washing and rinsing. However, simply adding an oily component usually results in the liquid oily component separating from other components, reducing the product's storage stability and possibly reducing its foaming ability during hair washing. Patent Documents 1 to 4 attempt to solve these problems by incorporating various components, but are still insufficient in terms of maintaining high levels of both storage stability and foaming ability. Therefore, there is a need for hair wash compositions that have excellent storage stability and maintain good properties such as foaming ability even when incorporating liquid oily components that provide hair care.

[0005] Therefore, an object of the present invention is to provide a hair wash composition that contains an oily component but has excellent storage stability, good foaming properties during hair washing, and excellent smoothness during rinsing. [Means for solving the problem]

[0006] The present inventors have discovered that the above-mentioned problems can be solved by blending a mono-fatty acid glyceryl, a fatty acid, and a higher alcohol into a hair wash composition containing a sulfate-based anionic surfactant and an oily component that is liquid at 25°C. That is, the present invention provides the following components (A) to (E): (A) a sulfate-based anionic surfactant, (B) monoglycerides of fatty acids, (C) fatty acid, (D) higher alcohols, and (E) An oily component that is liquid at 25°C, The present invention relates to a hair cleansing composition comprising: [Effects of the Invention]

[0007] The hair wash composition of the present invention can provide a hair wash composition that contains an oily component but has excellent storage stability, good foaming properties, and excellent smoothness during rinsing. DETAILED DESCRIPTION OF THE INVENTION

[0008] [Hair cleansing composition] The hair wash composition of the present invention comprises the following components (A) to (E): (A) a sulfate-based anionic surfactant, (B) monoglycerides of fatty acids, (C) fatty acid, (D) higher alcohols, and (E) An oily component that is liquid at 25°C, The hair cleansing composition comprises: The hair wash composition of the present invention, having the above-described configuration, is a hair wash composition that, despite containing an oily component, has excellent storage stability, good foaming properties, and excellent smoothness during rinsing.

[0009] <Definition> In the present invention, "hair" primarily refers to human head hair, but also includes hair that has been cut off from the human head. In the present invention, "comprises component X" or "contains component X" also means "composed of component X." In the present invention, the storage stability at −5° C., room temperature (RT: 25° C.), and 50° C. is used as an index of "storage stability." If the storage stability satisfies all of the conditions, the composition can be suitably used as a hair wash composition under various usage environments, such as low and high temperatures, and environments with temperature changes.

[0010] The reason why the hair wash composition of the present invention having the above-described structure exhibits the effects of the present invention is not clear, but is presumed to be as follows. The hair wash composition of the present invention contains a sulfate-based anionic surfactant as component (A), a monoglyceryl fatty acid as component (B), a fatty acid as component (C), a higher alcohol as component (D), and an oily component that is liquid at 25°C as component (E). While it is usually difficult to incorporate a large amount of component (E) into a hair wash composition due to concerns about product storage stability, it has been found that incorporating components (A), (B), (C), and (D) results in the formation of a stable dispersion within the system, which is thought to result in the stable emulsification of component (E). It has also been found that component (B) in the composition stabilizes the foam film formed during hair washing, and it is presumed that component (D) forms a hydrate on the hair surface during rinsing, resulting in good foaming and smooth hair during rinsing.

[0011] <Sulfate-based anionic surfactant (A)> The hair wash composition of the present invention contains a sulfate anionic surfactant (A) from the viewpoint of improving foaming properties. The sulfate anionic surfactant is an anionic surfactant having a sulfate ester structure containing an alkyl group or an alkenyl group, and any known anionic surfactant can be used without particular limitation. The inclusion of a sulfate anionic surfactant generally improves both foaming properties and cleansing properties, and also reduces production costs.

[0012] Examples of the sulfate-based anionic surfactant include polyoxyethylene alkyl ether sulfates and alkyl sulfates. These may be used alone or in combination of two or more. The hydrocarbon group such as an alkyl group contained in the sulfate-based anionic surfactant preferably has 8 to 22 carbon atoms, more preferably 8 to 18 carbon atoms, and even more preferably 10 to 18 carbon atoms. Counter ions of the anionic group of the anionic surfactant include alkali metal ions, ammonium ions, alkanolammonium, basic amino acids, etc. Here, examples of alkali metal ions include sodium ions and potassium ions, examples of alkanolammonium include alkanolammoniums having 1 to 3 alkanol groups with 2 or 3 carbon atoms (e.g., monoethanolammonium, diethanolammonium, triethanolammonium, triisopropanolammonium), etc., and examples of basic amino acids include lysine, hydroxylysine, histidine, arginine, etc.

[0013] Examples of polyoxyethylene alkyl ether sulfate ester salts include sulfate-based anionic surfactants represented by the following general formula (1), and examples of alkyl sulfate ester salts include sulfate-based anionic surfactants represented by the following general formula (2). R 1 (OCH2CH2) m -OSO3M (1) R 2 OSO3M (2) (In the formula, R 1 represents an alkyl group having 10 to 18 carbon atoms, and R 2 represents an alkyl group having 10 to 18 carbon atoms, M represents an alkali metal, ammonium, alkanolammonium or basic amino acid cation, and m represents the average number of moles added, which is a number of 1 to 5. From the viewpoint of improving storage stability, foaming properties, and smoothness during rinsing, the sulfate-based anionic surfactant represented by general formula (1) is preferably laureth sulfate, and the sulfate-based anionic surfactant represented by general formula (2) is preferably lauryl sulfate, more preferably laureth sulfate. Specific examples of laureth sulfate include sodium laureth sulfate and ammonium laureth sulfate, and specific examples of lauryl sulfate include sodium lauryl sulfate and ammonium lauryl sulfate.

[0014] The content of this component (A) in the hair wash composition is preferably 1.0% by mass or more, more preferably 5.0% by mass or more, and even more preferably 8.0% by mass or more from the viewpoint of good foaming and cleansing properties, and is preferably 20% by mass or less, more preferably 17.5% by mass or less, and even more preferably 15% by mass or less from the viewpoints of storage stability, freedom of formulation, and economy. Also, from the same viewpoints, the content is preferably 1% by mass or more and 20% by mass or less, more preferably 5.0% by mass or more and 17.5% by mass or less, and even more preferably 8.0% by mass or more and 15% by mass or less.

[0015] <Monoglyceryl fatty acids (B)> The hair wash composition of the present invention contains a mono-fatty acid glyceryl as component (B) from the viewpoints of improving storage stability, foaming ability, and smoothness during rinsing. The mono-fatty acid glyceryl is a mono-fatty acid ester of glycerin. Component (B) is considered to be a component that particularly contributes to improving the foaming ability of the hair wash composition. The hydrocarbon chain of component (B) may be a linear hydrocarbon chain or a branched hydrocarbon chain, and from the viewpoints of improving storage stability, foaming ability, foam retention, and smoothness during rinsing, it is preferably a linear hydrocarbon chain. Furthermore, this hydrocarbon chain may be a saturated hydrocarbon chain or an unsaturated hydrocarbon chain, and from the viewpoints of improving storage stability, foaming ability, foam retention, and smoothness during rinsing, it is preferably a saturated hydrocarbon chain. These may be used alone or in combination of two or more.

[0016] The number of carbon atoms in the acyl group of component (B) is preferably 8 or more from the viewpoints of improving storage stability, foaming ability, foam retention, and smoothness during rinsing, and from the viewpoints of irritation and odor, and from the viewpoints of improving foaming ability, foam retention, and smoothness during rinsing, and of achieving an appropriate formulation viscosity, it is preferably 22 or less, more preferably 18 or less, even more preferably 16 or less, still more preferably 14 or less, still more preferably 12 or less, and still more preferably 10 or less. Also, from the same viewpoints, it is preferably 8 or more and 22 or less, more preferably 8 or more and 18 or less, even more preferably 8 or more and 16 or less, still more preferably 8 or more and 14 or less, still more preferably 8 or more and 12 or less, still more preferably 8 or more and 10 or less, and still more preferably 10. Specific examples of mono-fatty acid glyceryl as component (B) include glyceryl caprylate, glyceryl caprate, glyceryl laurate, glyceryl myristate, and glyceryl palmitate. From the same viewpoint as above, glyceryl caprylate and glyceryl caprate are preferred, with glyceryl caprate being more preferred.

[0017] <Fatty acid (C)> The hair wash composition of the present invention contains a fatty acid as component (C) from the viewpoint of improving foaming properties. The fatty acid is a monocarboxylic acid having a carboxy group on the hydrocarbon chain. Component (C) is considered to be a component that contributes to improving the foaming properties of the hair wash composition and, together with component (D), to improving the storage stability of the hair wash composition. The hydrocarbon chain of component (C) may be a linear or branched hydrocarbon chain, and is preferably a linear hydrocarbon chain from the viewpoint of improving storage stability, foaming properties, foam retention, and smoothness during rinsing. Furthermore, this hydrocarbon chain may be a saturated or unsaturated hydrocarbon chain, and is preferably a linear saturated hydrocarbon chain from the viewpoint of improving storage stability, foaming properties, foam retention, and smoothness during rinsing. These may be used alone or in combination of two or more.

[0018] From the viewpoints of improving storage stability, foaming ability, foam retention, and smoothness during rinsing, and from the viewpoints of preventing irritating odors and bad smells, the number of carbon atoms in this component (C) is preferably 8 or more, more preferably 10 or more, and even more preferably 12 or more, and from the viewpoints of improving foaming ability, foam retention, and smoothness during rinsing, and of achieving an appropriate formulation viscosity, the number of carbon atoms in component (C) is preferably 22 or less, more preferably 18 or less, even more preferably 16 or less, and still more preferably 14 or less. From the same viewpoints, the number of carbon atoms in component (C) is preferably 8 or more and 22 or less, more preferably 8 or more and 18 or less, even more preferably 10 or more and 16 or less, still more preferably 10 or more and 14 or less, and still more preferably 12 or more and 14 or less. Specific examples of this component (C) include saturated fatty acids such as caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, 2-ethylhexanoic acid, and isostearic acid, and unsaturated fatty acids such as palmitoleic acid, oleic acid, linoleic acid, linolenic acid, and erucic acid, and of these, lauric acid and myristic acid are preferred from the same viewpoint as above.

[0019] <Higher alcohol (D)> The hair wash composition of the present invention contains a higher alcohol as component (D) from the viewpoint of improving smoothness during rinsing. The higher alcohol is a monohydric alcohol having an aliphatic group with 6 or more carbon atoms. Component (D) is considered to be a component that contributes to improving the smoothness of the hair wash composition during rinsing and, together with component (C), to improving the storage stability of the hair wash composition. The aliphatic group of component (D) may be a straight-chain aliphatic group or a branched-chain aliphatic group, with a straight-chain aliphatic group being preferred from the viewpoints of improving storage stability, foaming ability, foam retention, and smoothness during rinsing. The aliphatic group may be a saturated aliphatic group or an unsaturated aliphatic group, with a saturated aliphatic group being preferred from the viewpoints of improving storage stability, foaming ability, foam retention, and smoothness during rinsing. These may be used alone or in combination of two or more.

[0020] From the viewpoints of improving foaming ability, foam retention, and smoothness during rinsing, and from the viewpoints of irritation and odor, the number of carbon atoms in this component (D) is preferably 8 or more, more preferably 10 or more, and even more preferably 12 or more, and from the viewpoints of improving foaming ability, foam retention, and smoothness during rinsing, and of achieving an appropriate formulation viscosity, the number of carbon atoms is preferably 22 or less, more preferably 18 or less, even more preferably 16 or less, and still more preferably 14 or less. Also, from the same viewpoints, the number of carbon atoms is preferably 8 or more and 22 or less, more preferably 10 or more and 18 or less, even more preferably 10 or more and 16 or less, still more preferably 10 or more and 14 or less, and still more preferably 12 or more and 14 or less. Specific examples of component (D) include saturated linear aliphatic alcohols such as 1-octanol, 1-nonanol, 1-decanol, lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, 1-eicosanol, and behenyl alcohol, saturated branched aliphatic alcohols such as 2-ethylhexanol and isostearyl alcohol, and unsaturated aliphatic alcohols such as palmitoleic alcohol, oleyl alcohol, linoleyl alcohol, linolenyl alcohol, and erucyl alcohol. Of these, lauryl alcohol and myristyl alcohol are preferred from the same viewpoints as above.

[0021] In the present invention, by including each of the components (B) to (D), a hair wash composition having excellent properties in all of storage stability, foaming ability, foam retention, and smoothness upon rinsing can be obtained. To ensure that all of these properties are excellent, the total amount of components (B) to (D) in the hair wash composition is preferably 3.0% by mass or more, more preferably 3.5% by mass or more, even more preferably 4.0% by mass or more, still more preferably 5.0% by mass or more, and even more preferably 6.0% by mass or more. From the viewpoints of storage stability, formulation flexibility, and cost efficiency, the total amount is preferably 15% by mass or less, more preferably 12% by mass or less, even more preferably 10% by mass or less, still more preferably 9.0% by mass or less, and even more preferably 8.0% by mass or less. Furthermore, from the same viewpoint as above, the total amount of components (B) to (D) is preferably 3.0 mass% or more and 15 mass% or less, more preferably 3.0 mass% or more and 12 mass% or less, even more preferably 3.0 mass% or more and 10 mass% or less, still more preferably 4.0 mass% or more and 10 mass% or less, still more preferably 5.0 mass% or more and 9.0 mass% or less, and still more preferably 6.0 mass% or more and 8.0 mass% or less.

[0022] The preferred content of each of the components (B) to (D) relative to the total amount of the components (B) to (D) is as follows.

[0023] From the viewpoints of improving storage stability, lathering ability, and smoothness during rinsing, the content of component (B) is preferably 30% by mass or more, more preferably 40% by mass or more, even more preferably 50% by mass or more, and preferably 95% by mass or less, more preferably 85% by mass or less, and even more preferably 75% by mass or less, when the total amount of components (B) to (D) is taken as 100% by mass. Also, from the same viewpoints as above, the content of component (B) is preferably 30% by mass or more and 95% by mass or less, more preferably 40% by mass or more and 85% by mass or less, and even more preferably 50% by mass or more and 75% by mass or less, when the total amount of components (B) to (D) is taken as 100% by mass.

[0024] From the viewpoints of improving storage stability, lathering ability, and smoothness during rinsing, the content of component (C) is preferably 3.0% by mass or more, more preferably 5.0% by mass or more, and preferably 60% by mass or less, more preferably 55% by mass or less, even more preferably 50% by mass or less, or 45% by mass or less, when the total amount of components (B) to (D) is taken as 100% by mass. Also, from the same viewpoints as above, the content of component (C) is preferably 3.0% by mass or more and 60% by mass or less, more preferably 3.0% by mass or more and 55% by mass or less, even more preferably 5.0% by mass or more and 50% by mass or less, even more preferably 5.0% by mass or more and 45% by mass or less.

[0025] From the viewpoints of improving storage stability, lathering ability, and smoothness during rinsing, the content of component (D) is preferably 3.0% by mass or more, more preferably 5.0% by mass or more, even more preferably 10% by mass or more, still more preferably 12% by mass or more, and preferably 60% by mass or less, more preferably 55% by mass or less, even more preferably 50% by mass or less, and still more preferably 45% by mass or less, when the total amount of components (B) to (D) is taken as 100% by mass. Also, from the same viewpoints as above, the content of component (D) is preferably 3.0% by mass or more and 60% by mass or less, more preferably 3.0% by mass or more and 55% by mass or less, even more preferably 5.0% by mass or more and 50% by mass or less, and still more preferably 5.0% by mass or more and 45% by mass or less, when the total amount of components (B) to (D) is taken as 100% by mass.

[0026] <Oil component (E) that is liquid at 25°C> The hair wash composition of the present invention contains, as component (E), an oily component that is liquid at 25°C other than components (B) to (D), from the viewpoints of improving emulsion stability, improving smoothness during rinsing, imparting conditioning properties, and improving foaming properties. Here, "liquid at 25°C" means that the material has fluidity at 25°C and normal pressure, and is determined to be liquid in a liquid-solid determination test according to the American Society for Testing and Materials standard "ASTM D 4359-90: Standard Test Method for Determining Whether a Material is a Liquid or Solid."

[0027] Examples of oily components that are liquid at 25°C include hydrocarbons, glycerides, esters, silicones, fluorines, isostearyl glyceryl ether, and polyoxypropylene butyl ether. These may be used alone or in combination of two or more. Examples of hydrocarbons include straight-chain or branched-chain hydrocarbons, such as squalene, squalane, liquid paraffin, liquid isoparaffin, and cycloparaffin. Examples of glycerides include castor oil, cocoa oil, mink oil, avocado oil, and olive oil. Examples of esters include isopropyl palmitate, isopalmityl palmitate, isopropyl myristate, octyldodecyl myristate, hexyl laurate, cetyl lactate, propylene glycol monostearate, oleyl oleate, hexadecyl 2-ethylhexanoate, isononyl isononanoate, tridecyl isononanoate, and jojoba oil. Examples of silicones include dimethylpolysiloxane, methylphenylpolysiloxane, and dimethylcyclopolysiloxane. Examples of fluorine compounds include perfluoropolyethers.

[0028] The content of component (E) in the hair wash composition is preferably 0.5% by mass or more, more preferably 1.0% by mass or more, and even more preferably 1.5% by mass or more from the viewpoint of hair care, particularly improving smoothness during rinsing, and is preferably 15% by mass or less, more preferably 10% by mass or less, even more preferably 7.0% by mass or less, and still more preferably 5.0% by mass or less from the viewpoint of foaming ability and storage stability. Also, the content of the oily agent is, from the same viewpoint, preferably 0.5% to 15% by mass, more preferably 0.5% to 10% by mass, even more preferably 0.5% to 7.0% by mass, still more preferably 1.0% to 7.0% by mass, and still more preferably 1.5% to 5.0% by mass. The hair wash composition of the present invention, even when containing component (E), can suppress separation of components and has good storage stability, and therefore the content of oily components can be made higher than in conventionally known hair wash compositions of the same type.

[0029] The above-mentioned components (A) to (E) are essential components in the hair wash composition of the present invention. From the viewpoints of improving storage stability, foaming properties, and smoothness during rinsing, the total amount of these components (A) to (E) in the hair wash composition is preferably 10% by mass or more, more preferably 15% by mass or more, and preferably 50% by mass or less, more preferably 40% by mass or less, even more preferably 30% by mass or less, and even more preferably 25% by mass or less. From the same viewpoints, the total amount of components (A) to (E) is preferably 10% by mass or more and 50% by mass or less, more preferably 10% by mass or more and 40% by mass or less, even more preferably 10% by mass or more and 30% by mass or less, and even more preferably 15% by mass or more and 25% by mass or less. The hair wash composition of the present invention, even when containing component (E), can suppress separation of components and have good storage stability, and therefore the content of oily components can be made higher than in conventionally known hair wash compositions of the same type.

[0030] <Component (F): Surfactant other than components (A) and (B)> The hair wash composition of the present invention may further contain a surfactant other than components (A) and (B) as component (F), for the purpose of enhancing the favorable properties of foaming during washing and smoothness during rinsing. Component (F) is an optional component. Examples of the component (F) used in the present invention include anionic surfactants other than component (A), nonionic surfactants other than component (B), amphoteric surfactants, and cationic surfactants. Component (F) can be used singly or in combination of two or more. From the same viewpoint as above, it is preferable that component (F) contains one or more surfactants selected from the group consisting of nonionic surfactants and amphoteric surfactants other than component (B). Examples of nonionic surfactants other than component (B) include alkyl polyglycosides, polyoxyalkylene alkyl ethers, polyoxyethylene hydrogenated castor oil, polyoxyethylene fatty acid glyceryls, sorbitan fatty acid esters, polyoxyalkylene sorbitol fatty acid esters, (poly)ethylene glycol fatty acid esters, polyoxyalkylene fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, monoalkyl glyceryl ethers, monoalkenyl glyceryl ethers, and fatty acid monoalkanolamides, with polyoxyethylene fatty acid glyceryls and fatty acid monoalkanolamides being preferred. Specific examples of polyoxyethylene fatty acid glyceryls include coconut oil fatty acid PEG-7 glyceryl, and specific examples of fatty acid monoalkanolamides include cocamide MEA. Examples of amphoteric surfactants include betaine surfactants, amine oxide surfactants, and amino acid surfactants, and are preferably betaine surfactants. Specific examples of betaine surfactants include lauryl hydroxysultaine and lauramidopropyl betaine. When component (F) is contained, its content in the hair wash composition is preferably 1.0% by mass or more, more preferably 3.0% by mass or more, more preferably 5.0% by mass or more, and preferably 15% by mass or less, more preferably 10% by mass or less.

[0031] <Aqueous medium> The hair wash composition of the present invention contains an aqueous medium. The aqueous medium is preferably composed mainly of water, and may further contain an aqueous medium other than water. Examples of the aqueous medium other than water include lower alcohols such as ethanol and isopropyl alcohol, and low-molecular-weight diols and triols having 6 or less carbon atoms, such as 1,3-butylene glycol, glycerin, ethylene glycol, propylene glycol, diethylene glycol, and dipropylene glycol. The water content in the aqueous medium is preferably 40% by mass or more, more preferably 50% by mass or more, even more preferably 55% by mass or more, and is preferably 100% by mass or less.

[0032] From the viewpoints of achieving appropriate viscosity properties of the hair wash composition and good solubility of other components, the content of the aqueous medium in the hair wash composition is preferably 30% by mass or more, more preferably 40% by mass or more, even more preferably 50% by mass or more, still more preferably 60% by mass or more, and preferably 90% by mass or less, more preferably 85% by mass or less, even more preferably 80% by mass or less, and still more preferably 75% by mass or less. From the same viewpoints, the content of the aqueous medium is preferably 30% by mass or more and 90% by mass or less, more preferably 40% by mass or more and 85% by mass or less, even more preferably 50% by mass or more and 80% by mass or less, and still more preferably 60% by mass or more and 75% by mass or less.

[0033] The hair wash composition of the present invention may contain other components in addition to the above-mentioned components as appropriate, provided that the purpose of the present invention is not impaired. Examples of such components include antioxidants, polymers, antidandruff agents, vitamins, bactericides, anti-inflammatory agents, preservatives, chelating agents, moisturizers, ceramides, fragrances, colorants, UV absorbers, pH adjusters, and other components typically contained in other hair wash compositions.

[0034] The form of the hair wash composition of the present invention is not particularly limited, and it may be in any form such as liquid, foam, gel, paste, or cream, but is preferably in liquid, gel, or cream form.

[0035] The hair wash composition of the present invention has a viscosity and pH suitable for its form and method of use. The viscosity of the hair wash composition of the present invention is preferably 200 mPa·s or more, more preferably 300 mPa·s or more, even more preferably 500 mPa·s or more, and still more preferably 600 mPa·s or more, from the viewpoint of storage stability, and is preferably 80,000 mPa·s or less, more preferably 70,000 mPa·s or less, and even more preferably 65,000 mPa·s or less, from the viewpoint of ease of handling as a hair wash composition. The viscosity of this hair wash composition is the viscosity at 30°C, and can be measured, for example, with a Brookfield viscometer, specifically by the method described in the examples.

[0036] From the viewpoints of antiseptic properties and storage stability, the pH of the hair wash composition of the present invention is preferably 3.0 to 8.0, more preferably 3.5 to 7.5, even more preferably 3.7 to 7.0, and even more preferably 3.8 to 6.5. The pH of this hair wash composition is the value at 25°C when diluted to 5% (20 times by mass) with ion-exchanged water, simulating the pH at the time of application to hair, and can be specifically measured by the method described in the Examples.

[0037] [Method for producing hair cleanser composition] The method for producing the hair wash composition of the present invention is not particularly limited. For example, the composition can be produced by blending components (A) to (E), and optionally component (F) and other components, using a known method, and mixing them using a known stirring device or the like. In this process, the components may be mixed simultaneously, or a mixture of water-soluble components and a mixture of oil-soluble components may be prepared separately, and the blended components may be uniformly dissolved and then mixed to form the hair wash composition. For example, the hair wash composition is preferably prepared by the following procedure. First, a mixture of water-soluble components and a mixture of oil-soluble components are prepared separately. Specifically, a mixture of components (A), (F), and other water-soluble components, and a mixture of components (B) to (E) and other oil-soluble components are separately prepared. Next, these mixtures are heated to form homogeneous mixed solutions, and then gradually mixed while maintaining the temperature. After mixing, the mixture is cooled to room temperature (25°C) to prepare the hair wash composition. By preparing the composition in this manner, a hair wash composition can be obtained that has excellent storage stability, good foaming properties during hair washing, and excellent smoothness during rinsing. [Example]

[0038] The present invention will be described below with reference to examples and comparative examples, but the present invention is not limited to the scope of the examples. Measurements and evaluations in the examples were carried out by the following methods.

[0039] <Viscosity> Approximately 100 mL of the hair wash composition obtained in each example was filled into a 110 mL transparent glass container, sealed, and allowed to stand at 30°C for at least 1 hour. After this, the viscosity was measured using a Brookfield viscometer TVM (TV-10, manufactured by Toki Sangyo Co., Ltd.) (rotor No. 3, 12 rpm, 1 minute later). When the viscosity was too high to be measured using the above device, the viscosity was measured using a Brookfield viscometer TVR with a helical stand (TVB-10, manufactured by Toki Sangyo Co., Ltd.) (rotor TC, 10 rpm, 1 minute later).

[0040] <ph> The pH of the hair wash composition obtained in each example was measured at 25°C using a pH meter (F-51, manufactured by Horiba, Ltd.) For measuring the pH of the hair wash composition, an aqueous dispersion obtained by diluting the hair wash composition with purified water to 5% was used.

[0041] <Storage stability> Approximately 100 mL of the hair wash composition obtained in each example was filled into a 110 mL transparent glass bottle, sealed, and stored for one month at -5°C, room temperature (RT: 25°C), and 50°C. The appearance was then visually observed and evaluated according to the following evaluation criteria. The evaluation under each condition was considered to be a pass if it was rated A. In Tables 1 and 2, the overall evaluation of storage stability is shown as "pass" when two or more conditions were rated A, and as "fail" when one or less conditions were rated A. [Evaluation criteria] A: No separation B: Separation

[0042] <Foaming ability (foaming when washing hair)> A hair tress (prepared from chemically untreated hair of a Japanese woman) measuring approximately 20 g and 20 cm in length was wetted with tap water and then washed with hot water at 35 to 40°C using a plain shampoo of the following composition. 0.5 mL of each hair cleanser composition was applied to the washed hair tress. The tress was then lightly held between the palms of both hands and rubbed together, repeating this motion for 30 strokes to create a lather. The lather immediately after lathering was placed in a beaker, and the lather volume (mL) was calculated from the volume of the lather. This procedure was repeated three times, and the average lather volume is shown in Tables 1 and 2. Comparative Example 1 was used as a reference, and a lather ratio was calculated relative to this ratio, which is also shown in Tables 1 and 2 as the "lathering ratio." A lathering ratio of 1.0 or higher was considered good.

[0043] [Plain shampoo composition] *The amount of active ingredient is the amount of active ingredient (mass%). Polyoxyethylene (2.0) sodium lauryl ether sulfate (*C1): 47.2 Lauric acid diethanolamide (*C2): 2.5 Sodium benzoate: 1.1 Sodium chloride: 1.2 Ion-exchanged water: 86.6 Total:100.0 (*C1) 47.2% by mass of "Emeral 227" (active ingredient amount 27% by mass) manufactured by Kao Corporation (*C2) Aminone C-11S (Kao Corporation), active ingredient content 100% by mass

[0044] <Smoothness when rinsing> A hair tress (prepared from chemically untreated hair of a Japanese woman) measuring approximately 20 g and 25 cm in length was wetted with tap water and then washed with the plain shampoo of the above composition using hot water at 35-40°C. 0.5 mL of each example hair cleanser composition was applied to the washed hair tress. The tress was then gently held between the palms of both hands and rubbed together, repeating this motion for 30 strokes to create a lather. After lathering, the tress was rinsed for 30 seconds. After 20 strokes of combing to remove tangles, the tress was placed in a combing force measuring device (Utsunomiya Seiki Co., Ltd., "KOT-0303") and a comb (10 pins, 2 mm in diameter, spaced 4 mm apart in a straight line) was inserted into the top of the tress. The load (gf) applied when the comb was passed through the tress at a speed of 31.3 cm / s was measured. The load was calculated at 250 points at equal intervals (1 mm intervals) on a 25 cm long hair bundle, and the maximum value was taken as the "combing force." This operation was repeated 20 times, and the average value was taken as the "rinsing smoothness (combing force)." The smaller the "rinsing smoothness (combing force)," the smoother the combing. The result of Comparative Example 1 was used as the standard (reference), and a standard ratio to this was calculated and shown in Tables 1 and 2 as the "rinsing smoothness standard ratio." A rinsing smoothness standard ratio of 1.0 or less was considered good.

[0045] [Examples 1 to 17, Comparative Examples 1 to 8] (Preparation and Evaluation of Hair Cleansing Compositions) Component (A), cocamide MEA, and sodium benzoate listed in Tables 1 and 2 were added to water, heated to 80°C, and dissolved with stirring to obtain a mixture of water-soluble components. To the resulting mixture, succinic acid, potassium hydroxide, and lauryl hydroxysultaine were added, stirred, and cooled to below 50°C. Separately from this solution, components (B), (C), (D), and (E) and coconut oil fatty acid PEG-7 glyceryl were mixed, heated to 60°C, and stirred to obtain a mixture of oil-soluble components. The oil-soluble component mixture was added to the mixture of water-soluble components and stirred, and then lauramidopropyl betaine and a fragrance were added and stirred at below 40°C to obtain a hair wash composition.

[0046] The hair wash compositions obtained in each example were evaluated for storage stability, foaming ability, and smoothness during rinsing using the methods described above. The results are shown in Tables 1 and 2. The blending amount (mass %) of each component shown in the table is the amount of active ingredient.

[0047] [Table 1-1]

[0048] [Table 1-2]

[0049] [Table 2]

[0050] The ingredients listed in the table are as follows: *1: Emar 227-PH11 (Kao Corporation) *2: Emar 125A (Kao Corporation) *3: Sunsoft No. 760-C (Taiyo Kagaku Co., Ltd.) *4: Sunsoft o.707BS (manufactured by Taiyo Kagaku Co., Ltd.) *5: Lunac L-98 (Kao Corporation) *6: Lunac MY-98 (Kao Corporation) *7: Kalcol 4098 (Kao Corporation) *8: Kalcol 2098 (Kao Corporation) *9: NIKKOL Sugar Squalane (manufactured by Nippon Surfactant Kogyo Co., Ltd.) *10: Amizol CME (Kawaken Fine Chemicals Co., Ltd.) *11: Amphitheater 20HD (Kao Corporation) *12: Cetiol HE-JP (manufactured by BASF Japan Ltd.) *13: Amphitheater 20AB (Kao Corporation) *14: Sodium benzoate 35% (Aioi Chemisciences Co., Ltd.) *15: Succinic acid (manufactured by Nippon Shokubai Co., Ltd.) *16: Liquid caustic potash (48%) (Occidental Chemical Co., USA)

[0051] Tables 1 and 2 show that the hair wash compositions of the present invention (Examples 1 to 17) were good in storage stability, foaming ability, and smoothness during rinsing. On the other hand, the comparative examples that did not contain at least one of the essential components (B) to (E) of the present invention were insufficient in at least one of storage stability, foaming ability, and smoothness during rinsing. [Industrial Applicability]

[0052] According to the present invention, it is possible to provide a hair wash composition that has excellent storage stability, good foaming properties during hair washing, and excellent smoothness during rinsing.< / ph>

Claims

1. The following components (A) to (E): (A) a sulfate-based anionic surfactant, (B) monoglyceryl fatty acids, (C) fatty acid, (D) a higher alcohol, and (E) an oily component that is liquid at 25°C; A hair wash composition comprising:

2. the acyl group of component (B) has 8 to 10 carbon atoms; The component (C) has 12 or more and 14 or less carbon atoms, The hair wash composition according to claim 1, wherein the component (D) has 12 or more and 14 or less carbon atoms.

3. Relative to the total amount of the components (B) to (D), The content of the component (B) is 30% by mass or more and 95% by mass or less, The content of the component (C) is 3.0% by mass or more and 60% by mass or less, The hair wash composition according to claim 1, wherein the content of the component (D) is 3.0% by mass or more and 60% by mass or less.

4. The hair wash composition according to claim 1, wherein the total amount of the components (B) to (D) in the hair wash composition is 3.0% by mass or more and 15% by mass or less.

5. The hair wash composition according to claim 1, wherein the content of the component (E) is from 0.5% by mass to 15% by mass.

6. The hair wash composition according to claim 1, wherein the content of the component (A) is 1.0% by mass or more and 20% by mass or less.

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