Shampoo and washing method

Abstract

To provide: a shampoo that allows smooth finger combing of the hair after rinsing and exhibits excellent cleansing ability; and a washing method using the shampoo.SOLUTION: Provided is a shampoo that comprises (A) an anionic surfactant excluding sulfates, and (B) an amphoteric surfactant. The mass ratio of the (A) anionic surfactant excluding sulfates to the (B) amphoteric surfactant is from 0.5 to 2.5. The amphoteric surfactant (B) comprises at least one selected from the group consisting of (B1) an amidoalkyl betaine-type amphoteric surfactant having a hydrocarbon chain with 14 or more carbon atoms in the molecule (excluding coconut fatty acid amido propyl betaine), and (B2) an imidazoline-type amphoteric surfactant. Also provided is a washing method using the shampoo.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a shampoo that allows the hair to be easily combed with fingers after rinsing and has excellent detergency, and to a washing method using said shampoo. [Background technology]

[0002] 2. Description of the Related Art In shampoos for washing hair, anionic surfactants, which are sulfates such as sodium polyoxyethylene lauryl sulfate, have conventionally been widely used as components for ensuring foaming and cleaning power.

[0003] For example, Patent Document 1 discloses a shampoo composition that contains (A) 18% by mass or less of polyoxyethylene alkyl ether sulfate, (B) coconut oil fatty acid N-methylethanolamide, (C) cyclohexane-1,4-dicarboxylate bisethoxydiglycol, and (D) 1-menthol 1% by mass or more, and that can thoroughly remove dirt during hair washing. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-064939 A Summary of the Invention [Problem to be solved by the invention]

[0005] Anionic surfactants, which are sulfates such as sodium polyoxyethylene lauryl sulfate, widely used in shampoos, have excellent detergency, but have the problem that when a shampoo containing such surfactant is applied to hair and then the fingers are run through the wet hair after rinsing, the hair becomes difficult to run through because the fingers get caught in the hair, making it difficult to run the fingers through the hair. For this reason, attempts have recently been made to develop shampoos that contain reduced amounts of or no sulfate anionic surfactants.

[0006] However, shampoos containing reduced amounts of or no sulfate anionic surfactants have been found to have inferior cleansing power for sebum stains on hair and scalp compared to shampoos containing the sulfate anionic surfactant as the main anionic surfactant.

[0007] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a shampoo that allows smooth finger-combing of hair after rinsing and has excellent detergency, and to provide a washing method using said shampoo. [Means for solving the problem]

[0008] The shampoo of the present invention contains (A) at least one anionic surfactant other than sulfates, and (B) an amphoteric surfactant, the blending amount of the (A) anionic surfactant other than sulfate salt relative to the blending amount of the (B) amphoteric surfactant is, in terms of mass ratio, 0.5 or more and 2.5 or less; As the (B) amphoteric surfactant, at least one selected from the group consisting of (B1) amidoalkyl betaine type amphoteric surfactants having a hydrocarbon chain with 14 or more carbon atoms in the molecule (excluding coconut oil fatty acid amidopropyl betaine) and (B2) imidazoline type amphoteric surfactants is blended.

[0009] The washing method of the present invention is a washing method using the shampoo of the present invention. Effect of the Invention

[0010] According to the shampoo of the present invention, it is possible to provide a shampoo which allows the hair to be easily combed with fingers after rinsing and has excellent detergency.

[0011] Furthermore, according to the washing method of the present invention, a method for washing hair and / or scalp using a shampoo that allows the hair to be easily run through after rinsing and has excellent cleaning power can be provided. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, the present invention will be described based on an embodiment of the present invention (hereinafter, referred to as the present embodiment).

[0013] <Shampoo> The shampoo of the present embodiment is formulated with at least one type of (A) anionic surfactant excluding sulfates, and (B) an amphoteric surfactant, wherein the blending amount of the (A) anionic surfactant excluding sulfates relative to the blending amount of the (B) amphoteric surfactant is, in mass ratio, 0.5 or more and 2.5 or less, and the (B) amphoteric surfactant is at least one type selected from the group consisting of (B1) amidoalkyl betaine-type amphoteric surfactants having a hydrocarbon chain with 14 or more carbon atoms in the molecule (excluding coconut oil fatty acid amidopropyl betaine), and (B2) imidazoline-type amphoteric surfactant.

[0014] As described above, when a shampoo is prepared by reducing or not incorporating an anionic surfactant that is a sulfate, the smoothness of finger-combing after rinsing is improved but the cleaning power tends to be inferior compared to when an anionic surfactant that is a sulfate is incorporated as the main surfactant. However, the present inventors have found that when the above-mentioned (A) anionic surfactant other than sulfate and (B) amphoteric surfactant are incorporated as the surfactant, and the ratio of these is within a specific range, and further, a specific type of amphoteric surfactant is incorporated as the amphoteric surfactant (B), it is possible to ensure smooth finger-combing after rinsing and excellent cleaning power.

[0015] The shampoo of the present embodiment, which was completed based on such findings, is capable of ensuring excellent cleaning power even if it does not contain an anionic surfactant that is a sulfate, or even if the amount of such surfactant is reduced, and also makes the hair easier to run your fingers through after rinsing, which tends to be impaired by the inclusion of an anionic surfactant that is a sulfate.

[0016] The shampoo of this embodiment is expected to have better foaming and smoother finger-combing properties than shampoos containing a sulfate anionic surfactant as the main anionic surfactant. Here, "containing a sulfate anionic surfactant as the main anionic surfactant" means that the amount of the sulfate anionic surfactant blended in the shampoo is the largest.

[0017] (A) Anionic surfactants other than sulfates The shampoo of the present embodiment contains one or more anionic surfactants other than sulfates (sometimes referred to as component (A)). The "anionic surfactant other than sulfates" in component (A) refers to any anionic surfactant other than a sulfate anionic surfactant among known anionic surfactants used in shampoos.

[0018] In addition, the "anionic surfactant which is a sulfate" excluded from the component (A) refers to an anionic surfactant which has a sulfate group (SO4) in the molecule and is in the form of a salt. Examples of salt forms include sodium salt, potassium salt, magnesium salt, zinc salt, monoethanolamine salt, triethanolamine salt, diethanolamine salt, triisopropanolamine salt, monoisopropanolamine salt, ammonium salt, and arginine salt. Examples of anionic surfactants which are sulfate salts include alkyl sulfates (sodium lauryl sulfate, potassium lauryl sulfate, sodium cocoalkyl sulfate, sodium cetyl sulfate, etc.), alkylene sulfates (sodium oleyl sulfate, etc.), alkylglyceryl sulfates (sodium cocoglyceryl sulfate, etc.), polyoxyalkylene alkyl ether sulfates (sodium laureth sulfate, etc.), polyoxyalkylene alkylene ether sulfates (sodium oleth sulfate, etc.), and polyoxyalkylene alkyl fatty acid monoethanolamide sulfates (sodium PEG-3 coconut fatty acid amide MEA sulfate, etc.). The component names exemplified in the parentheses above are cosmetic display names.

[0019] Examples of component (A) include acylamino acids or salts thereof (lauroyl-L-aspartic acid, coconut oil fatty acid-L-glutamic acid, lauroyl-L-glutamic acid, myristoyl-L-glutamic acid, stearoyl-L-glutamic acid, coconut oil fatty acid methylalanine, lauroyl methylalanine, myristoyl methylalanine, coconut oil fatty acid acylglycine, coconut oil fatty acid methyltaurine, lauroyl methyltaurine, coconut oil fatty acid sarcosine, lauroyl sarcosine, or salts thereof (sodium salt, potassium salt, triethanolamine salt, etc.)), sodium coconut oil fatty acid, potassium coconut oil fatty acid, cocoyl isethionic acid or salts thereof (sodium salt, potassium salt, etc.), polyoxyethylene lauryl ether acetic acid or salts thereof (sodium salt, potassium salt, etc.), and the like. , potassium salts, etc.), alkyl sulfosuccinic acid or its salts (such as disodium lauryl sulfosuccinate), polyoxyethylene alkyl sulfosuccinic acid or its salts (disodium lauryl polyoxyethylene sulfosuccinate, disodium polyoxyethylene alkyl (12-14) sulfosuccinate, etc.), sodium lauroyl hydrolyzed silk, isostearic acid hydrolyzed silk AMP (2-amino-2-methyl-1-propanol salt of a condensate of isostearic acid and hydrolyzed silk), potassium cocoyl hydrolyzed soy protein, salts of cocoyl hydrolyzed collagen (sodium salt, potassium salt, etc.), sodium tetradecene sulfonate, polyoxyethylene lauryl ether phosphate or its salts (sodium salt, potassium salt, etc.).

[0020] Among the anionic surfactants other than sulfates, polyoxyethylene alkyl sulfosuccinic acid or its salt (preferably polyoxyethylene lauryl disodium sulfosuccinate) is more preferred from the viewpoint of smooth hair combing after rinsing and excellent cleaning power. Polyoxyethylene alkyl sulfosuccinic acid or its salt has a small effect of increasing the viscoelasticity of shampoo, and it is difficult to adjust the viscosity of a shampoo containing it to a relatively high level. However, when a specific amphoteric surfactant (at least one selected from the components (B1) and (B2) described below) is added to the (B) component together with polyoxyethylene alkyl sulfosuccinic acid or its salt, and the amount of the (A) component relative to the amount of the (B) component is set to 0.5 to 2.5, the viscosity of the shampoo can be increased by increasing the viscoelasticity of the shampoo. For example, polyoxyethylene alkyl sulfosuccinic acid or its salt may be one having an alkyl chain length of 12 to 20 carbon atoms and an average number of moles of ethylene oxide added of more than 0 and 10 or less.

[0021] It is more preferable to use polyoxyethylene lauryl ether acetic acid or a salt thereof (preferably sodium polyoxyethylene lauryl ether acetate, etc.) together with polyoxyethylene alkyl sulfosuccinic acid or a salt thereof as component (A), in which case the hair becomes easier to comb after rinsing with shampoo and more excellent cleaning power can be achieved. The polyoxyethylene lauryl ether acetic acid or a salt thereof may have an average number of moles of ethylene oxide added of more than 0 and not more than 11.

[0022] The blending amount of the (A) component in the shampoo of this embodiment is preferably 5.0% by mass or more, more preferably 7.0% by mass or more, from the viewpoint of increasing the amount of foam during hair washing to make washing easier. Also, the blending amount of the (A) component in the shampoo of this embodiment is preferably 18.0% by mass or less, more preferably 14.0% by mass or less, from the viewpoint of reducing costs.

[0023] (B) Amphoteric surfactant The shampoo of the present embodiment contains one or more amphoteric surfactants (sometimes referred to as component (B)), and as the amphoteric surfactant, at least one selected from the group consisting of (B1) amidoalkyl betaine type amphoteric surfactants having a hydrocarbon chain with 14 or more carbon atoms in the molecule (excluding coconut oil fatty acid amidopropyl betaine), and (B2) imidazoline type amphoteric surfactants.

[0024] The (B1) amidoalkyl betaine amphoteric surfactant having a hydrocarbon chain with 14 or more carbon atoms in the molecule (excluding coconut oil fatty acid amidopropyl betaine) is sometimes referred to as component (B1). Also, the (B2) imidazoline amphoteric surfactant is sometimes referred to as component (B2).

[0025] Examples of the component (B1) include those represented by the following general formula (1) (excluding coconut oil fatty acid amidopropyl betaine).

[0026] [ka]

[0027] In the above general formula (1), R 1 R is a hydrocarbon group having 14 or more carbon atoms. 1 The carbon number of is usually 22 or less.

[0028] Examples of the component (B1) include myristic acid amidopropyl betaine, isostearic acid amidopropyl betaine, stearic acid amidopropyl betaine, and ricinoleic acid amidopropyl betaine.

[0029] Moreover, examples of the component (B2) include those represented by the following general formula (2).

[0030] [ka]

[0031] In the above general formula (2), R 2 is a hydrocarbon group having 10 to 22 carbon atoms.

[0032] Examples of the (B2) component satisfying the above general formula (2) include 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, undecyl-N-hydroxyethyl-N-carboxymethylimidazolinium betaine, and N-coconut oil fatty acid acyl-N'-carboxyethyl-N'-hydroxyethylethylenediamine sodium.

[0033] Examples of the cosmetic name of the component (B2) include sodium lauroamphoacetate, sodium cocoamphoacetate, sodium argan amphoacetate, sodium olive amphoacetate, sodium oleoamphoacetate, sodium cacao butter amphoacetate, sodium caproamphoacetate, sodium rice bran amphoacetate, sodium sesame amphoacetate, sodium shea butter amphoacetate, sodium sweet almond amphoacetate, sodium stearoamphoacetate, sodium babassu amphoacetate, sodium palm amphoacetate, sodium sunflower seed amphoacetate, sodium peanut amphoacetate, sodium grape seed amphoacetate, sodium mango amphoacetate, and sodium cottonseed amphoacetate.

[0034] The shampoo of the present embodiment contains, for example, one or more components selected from myristate amidopropyl betaine, isostearate amidopropyl betaine, and 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine as component (B).

[0035] The shampoo of the present embodiment contains, as the component (B), at least one selected from the group consisting of the components (B1) and (B2), and may further contain, as the component (B), one or more amphoteric surfactants other than the components (B1) and (B2) (sometimes referred to as the component (B3)).

[0036] Examples of the component (B3) include amidoalkyl betaine type amphoteric surfactants other than the component (B1) (e.g., lauric acid amidopropyl betaine, coconut oil fatty acid amidopropyl betaine, etc.), alkyl dimethyl amino acetate betaines (e.g., lauryl dimethyl amino acetate betaine, coconut oil alkyl dimethyl amino acetate betaine), sulfobetaine type amphoteric surfactants (e.g., lauryl hydroxysulfobetaine), and amidoamine oxide type amphoteric surfactants (e.g., lauric acid amidopropyl dimethylamine oxide).

[0037] The blending amount of component (B) in the shampoo of this embodiment is preferably 2.0% by mass or more, more preferably 2.5% by mass or more, from the viewpoint of increasing the viscoelasticity of the shampoo and thereby increasing the viscosity of the shampoo. Also, the blending amount of component (B) in the shampoo of this embodiment is preferably 15.0% by mass or less, more preferably 10.0% by mass or less, from the viewpoint of preventing the viscosity of the shampoo from becoming too high due to the increased viscoelasticity of the shampoo.

[0038] The total amount of the (B1) and (B2) components in the shampoo of this embodiment (when only the (B1) component is used as the (B) component, it is the amount of the (B1) component, when only the (B2) component is used, it is the amount of the (B2) component, and when both the (B1) and (B2) components are used, it means the total amount of the (B1) and (B2) components. The same meaning is used below.) is preferably 0.5% by mass or more, more preferably 1% by mass or more, from the viewpoint of improving the smoothness of running fingers through the hair after rinsing, and even more preferably 1.5% by mass or more, from the viewpoint of improving the smoothness of running fingers through the hair after rinsing and achieving even better cleaning power. The total amount of the (B1) and (B2) components is, for example, 15.0% by mass or less.

[0039] The mass ratio of the total amount of the (B1) and (B2) components to the amount of the (B) component in the shampoo of this embodiment (the total amount of the (B1) and (B2) components when the amount of the (B) component is 1 by mass. Hereinafter, this may be referred to as the {(B1)+(B2)} / (B) ratio.) is preferably 0.05 or more, more preferably 0.10 or more, even more preferably 0.20 or more, and even more preferably 0.25 or more, from the viewpoint of improving the combing of the hair after rinsing and achieving superior cleaning power. The {(B1)+(B2)} / (B) ratio in the shampoo of this embodiment is, for example, 1 or less.

[0040] When the shampoo of this embodiment contains the component (B3), the amount contained is, for example, from 1% by mass to 8% by mass.

[0041] Mass ratio of the amount of component (A) to the amount of component (B) In the shampoo of this embodiment, the mass ratio of the blended amount ...

[0042] The (A) / (B) ratio of the shampoo of the present embodiment is preferably 0.7 or more, and more preferably 0.9 or more, from the viewpoint of superior cleansing power, and is even more preferably 1.0 or more, from the viewpoint of improving the combing of hair after rinsing and enabling the realization of even superior cleansing power.

[0043] The (A) / (B) ratio of the shampoo of the present embodiment is preferably 2.0 or less, more preferably 1.8 or less, even more preferably 1.6 or less, and even more preferably 1.5 or less, from the viewpoint of improving the combing ability of the hair after rinsing.

[0044] From the above-mentioned viewpoints, the (A) / (B) ratio of the shampoo of this embodiment is preferably 0.7 or more and 2.0 or less, more preferably 0.9 or more and 1.8 or less, even more preferably 1.0 or more and 1.6 or less, and even more preferably 1.0 or more and 1.5 or less.

[0045] solvent The shampoo of the present embodiment can use water as a solvent, similar to ordinary shampoos. The blending amount of water in the shampoo is, for example, 25% by mass or more and 90% by mass or less.

[0046] Compatible ingredients In addition to the above-mentioned components, the shampoo of the present embodiment may contain various components that are contained in ordinary hair cosmetics such as shampoos, if necessary. Examples of such components that can be contained include nonionic surfactants, cationic polymers, preservatives, moisturizing agents, anti-inflammatory agents, and pH adjusters.

[0047] Specific examples of nonionic surfactants include alkyl alkanol type nonionic surfactants such as coconut oil fatty acid N-methylethanolamide, lauric acid diethanolamide, palm kernel oil fatty acid diethanolamide, stearic acid monoethanolamide, and lauric acid monoisopropanolamide, polyoxyethylene glycerin fatty acid ester, polyoxyethylene sorbitol fatty acid ester, polyglycerin fatty acid ester, polyethylene glycol derivatives of monoglycerides or diglycerides obtained from vegetable oils, polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene polyoxypropylene alkylene ethers, polyoxyethylene alkyl ethers, polyoxyethylene alkylene ethers, polyoxypropylene alkyl ethers, polyoxypropylene alkylene ethers, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, and polyoxyethylene hydrogenated castor oil. When a nonionic surfactant is blended in the shampoo of this embodiment, the blending amount is, for example, 0.1% by mass or more and 5% by mass or less.

[0048] Specific examples of cationic polymers include cationic cellulose (O-[2-hydroxy-3-(trimethylammonio)propyl]hydroxyethylcellulose chloride, hydroxyethylcellulose-dimethyldiallylammonium chloride copolymer, etc.), cationic starch, cationic xanthan gum, cationic fenugreek gum, cationic guar gum, cationic tara gum, cationic locust bean gum, diallyl quaternary ammonium salt-acrylamide copolymer, vinylimidazolium trichloride-vinylpyrrolidone copolymer, vinylpyrrolidone-quaternary dimethylaminoethyl methacrylate copolymer. copolymer, vinylpyrrolidone-alkylaminoacrylate copolymer, vinylpyrrolidone-alkylaminoacrylate-vinylcaprolactam copolymer, vinylpyrrolidone-methacrylamidopropyl trimethylammonium chloride copolymer, alkylacrylamide-acrylate-alkylaminoalkylacrylamide-polyethylene glycol methacrylate copolymer, N,N-dimethylaminoethyl diethyl methacrylate sulfate-N,N-dimethylacrylamide-polyethylene glycol dimethacrylate copolymer adipic acid-dimethylaminohydroxypropyl ethylenetriamine copolymer. When a cationic polymer is blended in the shampoo of the present embodiment, the blending amount is, for example, 0.1% by mass or more and 3% by mass or less.

[0049] Specific examples of preservatives include benzoic acid and its salts (such as the sodium salt); parahydroxybenzoic acid esters such as methyl parahydroxybenzoate, propyl parahydroxybenzoate, and butyl parahydroxybenzoate and their salts (such as the sodium salt); salicylic acid and its salts (such as the sodium salt); sorbic acid and its salts; phenoxyethanol; methylchloroisothiazolinone and methylisothiazolinone.

[0050] Specific examples of the humectant include polyhydric alcohols such as propylene glycol, dipropylene glycol, glycerin, and butylene glycol; and sugars such as honey.

[0051] Specific examples of anti-inflammatory agents include glycyrrhizinic acid, glycyrrhetinic acid, carbenoxolone and their salts (sodium salt, potassium salt, ammonium salt, etc.); 3-succinyloxyglycyrrhetinic acid and its salts (sodium salt, potassium salt, ammonium salt, etc.); allantoin; guaiazulene; and various plant extracts having anti-inflammatory effects (chamomile extract, gentian extract, Scutellaria root extract, perilla extract, horse chestnut extract, etc.).

[0052] Specific examples of pH adjusters include acids such as citric acid, phosphoric acid, malic acid, tartaric acid, and lactic acid; and alkalis such as sodium hydroxide, potassium hydroxide, triethanolamine, and arginine.

[0053] The shampoo of this embodiment has, for example, a pH of 3 or more and 8 or less. When a pH adjuster is used in the shampoo, it is advisable to use it in an amount that brings the pH of the shampoo to a value within the above range.

[0054] Furthermore, in addition to the components listed above, the shampoo of this embodiment may contain oils such as lanolin derivatives, liquid paraffin, higher fatty acids, higher alcohols, esters, and silicone oils; thickeners; conditioning agents (conditioning agents other than the above-mentioned components); antioxidants and chelating agents for preventing discoloration and oxidation; anti-dandruff agents; bactericides; ultraviolet absorbers; and fragrances.

[0055] In the shampoo of this embodiment, the amount of the anionic surfactant that is a sulfate is preferably limited, and more preferably not used, from the viewpoint of suppressing the tendency for the shampoo to have poor finger-combing after rinsing. The amount of the anionic surfactant that is a sulfate in the shampoo is, for example, 1% by mass or less, but from the above-mentioned viewpoint, it is preferably 0.5% by mass or less, more preferably 0.3% by mass or less, even more preferably 0.1% by mass or less, even more preferably 0.05% by mass or less, and particularly preferably 0% by mass.

[0056] The shampoo of the present embodiment contains, for example, an anionic surfactant that is a sulfate in an amount of 1% by mass or less, or does not contain an anionic surfactant that is a sulfate.

[0057] others The shampoo of the present embodiment may be in a liquid form, similar to ordinary shampoos.

[0058] The value of viscoelasticity, which is an index of viscosity in the shampoo of this embodiment, is measured, for example, using a rheometer (e.g., a stress-controlled rheometer "Rheo Stress 6000" (product name) manufactured by HAAKE Co., Ltd.) under the conditions of a measurement temperature of 25°C, a diameter of a cone-plate sensor of 35 mm, an inclination angle of the cone-plate sensor of 2°, a steady flow curve mode, and a waiting time of 1 minute, at a shear rate of 36 s -1 The viscoelasticity measured is between 50 mPa s and 5,000 mPa s.

[0059] When the shampoo of this embodiment is in a liquid form, the viscoelasticity measured under the above conditions is 5000 mPa·s or less.

[0060] The shampoo of the present embodiment can be used to cleanse the hair and / or scalp in the same manner as a normal shampoo (a shampoo used to clean wet hair). In this specification, "and / or" means either one or both.

[0061] The method for producing the shampoo of this embodiment may be any method for producing a known shampoo.

[0062] <Cleaning method> The washing method of the present embodiment uses the shampoo of the present embodiment described above. The washing method of the present embodiment can be used to wash hair and / or scalp in the same manner as a normal shampoo (a shampoo used to wash wet hair). EXAMPLES

[0063] The present invention will be described in detail below based on examples. However, the following examples do not limit the present invention. In the following Tables 1 to 4 and 6, the blending amount of each component is shown in % so that the total shampoo amount is 100%, but the % is always mass %, and the % is omitted in these tables, and only the numerical value indicating the blending amount is shown.

[0064] Examples 1 to 13 and Comparative Examples 1 to 5 Disodium lauryl polyoxyethylene sulfosuccinate (ingredient (A)), sodium polyoxyethylene lauryl ether acetate (4.5EO) (ingredient (A)), sodium coconut oil fatty acid methyl taurate (ingredient (A)), sodium polyoxyethylene lauryl ether sulfate, myristate amidopropyl betaine (ingredient (B1)), isostearate amidopropyl betaine (ingredient (B1)), 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine (ingredient (B1)), Shampoos (liquid formulations) of Examples 1 to 13 and Comparative Examples 1 to 5 were prepared by mixing in a conventional manner the compositions shown in Tables 1 to 4 using the following ingredients: lauric acid amidopropyl betaine (component (B3)), coconut oil fatty acid amidopropyl betaine (component (B3)), coconut oil fatty acid N-methylethanolamide, O-[2-hydroxy-3-(trimethylammonio)propyl]hydroxyethylcellulose chloride, sodium benzoate, citric acid, fragrance, and purified water, and were then subjected to the following evaluations.

[0065] The viscoelasticity values ​​of the shampoos of Examples 1 to 13 and Comparative Examples 1 to 5 were 5000 mPa·s or less when measured under the following conditions. (Measurement conditions) Using a stress-controlled rheometer "Rheo Stress6000" (product name) manufactured by HAAKE, the measurement temperature was 25°C, the diameter of the cone-plate sensor was 35 mm, the inclination angle of the cone-plate sensor was 2°, the steady flow curve mode was used, and the waiting time was 1 minute. The shear rate was 36 s -1 The values ​​were measured at .

[0066] <Evaluation of hair feel after rinsing> A number of black hair bundles (20 cm long human hair bundles, 5 g per bundle) were prepared from the same Japanese female, and one bundle was assigned to each of five evaluators who routinely evaluate shampoos. Each evaluator took 0.4 g of one of the shampoos from the Examples and Comparative Examples in their hands, applied it to the hair bundle wet with water, lathered it for 30 seconds, and then rinsed it with water. After rinsing, the hair was evaluated for finger-running ability (when fingers were run from the middle to the ends of the hair, the hair was easy to run without getting caught).

[0067] The evaluation of the ease of running fingers through the hair was carried out according to the following procedure. First, each evaluator assigned a score according to the following criteria. (Evaluation standard for hair smoothness) 5 points: Much better than when using the shampoo of Comparative Example 2 (when running fingers through wet hair from the middle to the ends after rinsing, the hair does not get caught and is much easier to run fingers through than with Comparative Example 2). 4 points: Better than using the shampoo of Comparative Example 2 (when running fingers through wet hair from the middle to the ends after rinsing, the hair does not get caught and it is easier to run fingers through than with Comparative Example 2). 3 points: Same as when using the shampoo of Comparative Example 2 (when running fingers through wet hair from the middle to the ends after rinsing, the hair gets caught and is difficult to run fingers through, similar to Comparative Example 2). 2 points: Worse than when using the shampoo of Comparative Example 2 (when running fingers through wet hair from the middle to the ends after rinsing, the hair gets caught and is more difficult to run fingers through than with Comparative Example 2). 1 point: Very bad compared to the shampoo of Comparative Example 2 (when running fingers through wet hair from the middle to the ends after rinsing, the hair gets caught and is much more difficult to run fingers through than with Comparative Example 2).

[0068] The sum of the scores given by each evaluator was then divided by 5 (total number of evaluators) to obtain an average score, which was then ranked according to the following criteria to evaluate the shampoos of the Examples and Comparative Examples. (Ranking in evaluation of hair smoothness) ◎: Average score is 4 points or higher. ○: Average score is between 3.2 and 4 points. Equivalent: Mean score is 2.8 or more but less than 3.2. △: Average score is between 2 and 2.8 points. ×: Average score is less than 2 points.

[0069] <Cleaning test> A plurality of glass plates were prepared with approximately 0.10g of model sebum soil weighed, and the weight was measured and then left to stand in a room at 25°C for 1 hour. Then, solutions were prepared by diluting each of the shampoos of the Examples and Comparative Examples with water to a concentration of 10% by mass, and approximately 0.06g of each of these was applied to the model sebum soil on separate glass plates, and rubbed with a hand wearing a nitrile glove for 30 seconds without applying force. A plurality of 50mL beakers containing 30g of tap water were prepared, and each glass plate was immersed in tap water in each separate beaker for 30 seconds to rinse. Then, each glass plate was removed from the beaker, naturally dried under 25°C conditions, and the weight was measured. Then, the cleaning rate of each shampoo was calculated according to the following formula. This measurement was performed three times (N=3) for each shampoo of the Examples and Comparative Examples, and the average values ​​are shown in Tables 1 to 4. Here, it can be said that the higher the cleaning rate value of a shampoo, the better the cleaning power. For the above model sebum stain, an oily substance prepared according to the composition shown in Table 5 was used.

[0070] Cleaning rate (%) = 100 × {(bc) / (ba)}

[0071] In the above formula for calculating the cleaning rate, a: weight of the glass plate (g), b: weight of the glass plate (g) before the model sebum stains are weighed and cleaned, and c: weight of the glass plate (g) after washing with shampoo and drying.

[0072] <Foaming evaluation> A number of 100mL screw-top bottles ("SV-100" manufactured by Nichiden Rika Glass Co., Ltd.) were prepared. Each of these screw-top bottles was filled with about 2g of the shampoo of the embodiment or the comparative example, about 12g of tap water, and about 0.1g of oleic acid, and then sealed with a cap for the screw-top bottle. The screw-top bottle was held by hand and shaken up and down 10 times at a width of about 50 cm, and the foam height (mm) was measured after the contents were mixed and left to stand for 30 seconds. Here, it can be said that the higher the foam height (mm) of the shampoo, the better the foaming.

[0073] The above evaluation results are shown in Tables 1 to 4. The "appropriate amount" of "citric acid" in Tables 1 to 4 means the amount at which the shampoo pH becomes 5.6 (the same applies to Table 6 below). In addition, the "4.5EO" in parentheses after "sodium polyoxyethylene lauryl ether acetate" in Tables 1 to 4 means that the average number of moles of ethylene oxide added is 4.5. Furthermore, the "total of 100" in the purified water column in Tables 1 to 4 means that the total amount of each component other than purified water constituting the shampoo is added to the amount of purified water to make up 100% (the same applies to Table 6 below).

[0074] [Table 1]

[0075] [Table 2]

[0076] [Table 3]

[0077] [Table 4]

[0078] [Table 5]

[0079] As shown in Table 1, the shampoos of Examples 1 to 6, which were prepared by blending the (A) component and the (B1) component in a ratio such that the (A) / (B) ratio was in the range of 0.5 to 2.5, had good hair combability after rinsing, high cleaning rates in the cleaning test, excellent cleaning power, and also had excellent foaming. In contrast, the shampoo of Comparative Example 1 ((A) / (B) ratio was 0.2), which had an (A) / (B) ratio smaller than the range of 0.5 to 2.5, had poor hair combability after rinsing, a low cleaning rate in the cleaning test, and poor foaming. Furthermore, the shampoo of Comparative Example 2 ((A) / (B) ratio was 3.7), which had an (A) / (B) ratio larger than the range of 0.5 to 2.5, had poor hair combability after rinsing.

[0080] In addition, when comparing the ease of running hair after rinsing in each of the shampoos of Examples 1, 2, 5, and 6 shown in Table 1, the shampoos of Examples 1, 2, and 5 (with (A) / (B) ratios of 0.5, 0.8, and 1, respectively) had better hair-running properties after rinsing than Example 6 (with (A) / (B) ratio of 2.5). In addition, when comparing the ease of running hair after rinsing in the shampoos of Examples 1 and 2, the shampoo of Example 2 (with (A) / (B) ratios of 0.8, respectively) had better hair-running properties after rinsing than Example 1 (with (A) / (B) ratio of 0.5). Therefore, it can be seen that when the (A) / (B) ratio of a shampoo is in the range of more than 0.5 and less than 2.5, the hair tends to run more smoothly after rinsing.

[0081] As shown in Table 2, the shampoos of Examples 3 and 7 to 9 had the same or higher cleaning rates and better combability after rinsing than the shampoo of Comparative Example 3 (an example in which an anionic surfactant (sodium polyoxyethylene lauryl ether sulfate), a sulfate commonly used in conventional shampoos, was used instead of component (A).

[0082] As shown in Table 2, the shampoos of Examples 3 and 7, which used polyoxyethylene lauryl disodium sulfosuccinate as component (A), had higher cleaning rates and better cleaning power in the cleaning test than the shampoos of Examples 8 and 9, which did not use this ingredient. In addition, when comparing the shampoos of Examples 3 and 7, the shampoo of Example 3, which used polyoxyethylene lauryl ether sodium acetate in addition to polyoxyethylene lauryl disodium sulfosuccinate as component (A), had even better cleaning power.

[0083] As shown in Table 3, the shampoos of Examples 3, 10, and 11, which contained either the component (B1) or the component (B2) as the component (B), had better combability after rinsing than the shampoos of Comparative Examples 4 and 5, which did not contain the components (B1) and (B2).

[0084] As shown in Table 4, the shampoos of Examples 3, 12, and 13 containing the component (B1) had better hair-running properties after rinsing than the shampoo of Comparative Example 5 containing no component (B1). Furthermore, a comparison of the shampoos of Examples 3, 12, and 13 showed that an increase in the amount of component (B1) in the (B) component or the {(B1)+(B2)} / (B) ratio improved hair-running properties after rinsing, increased the cleaning rate in the cleaning test, and ensured better cleaning power and also resulted in better foaming. In addition, when the shampoos of Examples 12 and 13 shown in Table 4 were compared for their ease of running fingers through hair after rinsing, the shampoo of Example 12 (containing 1.5% by mass of the (B1) component and a {(B1)+(B2)} / (B) ratio of 0.21) had better hair-running ability after rinsing than the shampoo of Example 13 (containing 0.5% by mass of the (B1) component and a {(B1)+(B2)} / (B) ratio of 0.07). Therefore, it can be seen that the greater the amount of the (B1) component in the (B) component or the larger the {(B1)+(B2)} / (B) ratio, the easier it is to run fingers through hair after rinsing.

[0085] Comparative Example 6 The shampoo (liquid formulation) of Comparative Example 6 was prepared by mixing the components in a conventional manner so as to obtain the composition shown in Table 6.

[0086] The viscoelasticity of the shampoo of Comparative Example 6 and the shampoo of Example 7 was measured using a rheometer. The results are shown in Table 6. The viscoelasticity was measured using a stress-controlled rheometer "Rheo Stress6000" (product name) manufactured by HAAKE, at a shear rate of 36 s under the following conditions: measurement temperature: 25°C, diameter of the cone-plate sensor: 35 mm, inclination angle of the cone-plate sensor: 2°, in steady flow curve mode, and waiting time of 1 minute. -1 The values ​​were measured at .

[0087] [Table 6]

[0088] As described above, polyoxyethylene lauryl disodium sulfosuccinate has a small effect of increasing the viscoelasticity, which is an index of shampoo viscosity, and it is difficult to prepare a shampoo with a relatively high viscosity using it. As shown in Table 6, the shampoo of Comparative Example 6, in which the amount of polyoxyethylene lauryl disodium sulfosuccinate (A) was increased to increase the (A) / (B) ratio to 3.7, was significantly affected by the incorporation of polyoxyethylene lauryl disodium sulfosuccinate, and the viscoelasticity value was very low. In contrast, the shampoo of Example 7, in which the (A) / (B) ratio was set to 1, which is within the range of 0.5 to 2.5, used only polyoxyethylene lauryl disodium sulfosuccinate as the (A) component, but had a higher viscoelasticity value than Comparative Example 6 due to the action of the (B1) component, and had a relatively high viscosity as a shampoo.

Claims

1. (A) an anionic surfactant other than a sulfate, and (B) an amphoteric surfactant is added, the blending amount of the anionic surfactant (A) other than sulfate salts relative to the blending amount of the amphoteric surfactant (B) is, in terms of mass ratio, 0.5 or more and 2.5 or less; The shampoo contains, as the (B) amphoteric surfactant, at least one selected from the group consisting of (B1) amidoalkyl betaine amphoteric surfactants having a hydrocarbon chain having 14 or more carbon atoms in the molecule (excluding coconut oil fatty acid amidopropyl betaine) and (B2) imidazoline amphoteric surfactants.

2. 2. The shampoo according to claim 1, wherein (A) the anionic surfactant other than sulfates is polyoxyethylene alkyl sulfosuccinic acid or a salt thereof.

3. 3. The shampoo according to claim 2, further comprising polyoxyethylene alkyl ether acetic acid or a salt thereof as the anionic surfactant other than sulfates (A).

4. 3. The shampoo according to claim 1 or 2, wherein the combined amount of at least one surfactant selected from the group consisting of (B1) amidoalkyl betaine type amphoteric surfactants having a hydrocarbon chain containing 14 or more carbon atoms in the molecule (excluding coconut oil fatty acid amidopropyl betaine) and (B2) imidazoline type amphoteric surfactant is 0.5% by mass or more.

5. 3. The shampoo according to claim 1 or 2, further comprising, as the amphoteric surfactant (B), one or more selected from the group consisting of myristate amidopropyl betaine, isostearate amidopropyl betaine, and 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine.

6. 3. The shampoo according to claim 1, wherein the ratio by mass of the blended amount of the anionic surfactant excluding sulfates (A) to the blended amount of the amphoteric surfactant (B) is 0.7 or more and 2.0 or less.

7. A washing method using the shampoo according to claim 1 or 2.

Images