Hair Cleansing Agent

Abstract

To provide a hair washing agent that improves the feel of hair after rinsing.SOLUTION: A hair washing agent is adopted that contains component (A): an anionic surfactant, component (B): an ampholytic surfactant, component (C): a polyglyceryl fatty acid ester with an HLB of 8 or more, and component (P): an acrylic polymer compound having a functional group represented by general formula (am) and an amide bond in a side chain. In the formula (am), Ra and Rb independently represent an alkyl group or a hydrogen atom. Rc may be an alkyl group or a hydrogen atom, or may be an alkylene group and bound to the polymer main chain. Z- is a counter anion. * is a bond.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a hair cleansing agent. [Background technology]

[0002] Hair cleansing agents are required to have not only cleaning power to remove dirt from the hair and scalp, but also rinsing performance. In particular, women with long hair prefer a feel that makes it easy to run fingers through their hair and prevents tangling during rinsing.

[0003] Hair cleansing agents generally contain a cleansing component and a conditioning component. As cleaning components, for example, anionic surfactants such as polyoxyalkylene alkyl ether sulfates and amphoteric surfactants such as lauric acid amidopropyl betaine are used, while as conditioning components, cationic polymer compounds such as cationic cellulose and cationic guar gum are used. By appropriately combining these cleaning components and conditioning components, it is possible to achieve a balance between cleaning power and rinsing performance.

[0004] For example, a transparent gel-like composition has been proposed as a hair cleanser that emphasizes cleansing power, which contains a polyoxyalkylene alkyl ether sulfate, a betaine-type amphoteric surfactant, a cationic polymer having a sugar skeleton, an inorganic salt, and a polyglycerol fatty acid ester having an HLB of 12 or more (see Patent Document 1). It is said that the composition described in Patent Document 1 can effectively remove excess sebum and dirt from the scalp. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2008-081415 A Summary of the Invention [Problem to be solved by the invention]

[0006] Conventional hair cleansing agents that contain a cationic polymer having a sugar skeleton as a conditioning component, such as the composition described in Patent Document 1, can exhibit rinsing performance that allows easy running of fingers through damaged hair, such as long hair that has been colored. On the other hand, when conventional hair cleansers are used on short hair or hair that is not significantly damaged (hereinafter collectively referred to as "normal hair"), components derived from the hair cleanser remain in excess on the hair after rinsing, causing problems such as a poor feel to the touch.

[0007] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a hair cleansing agent that provides an improved feel after rinsing. [Means for solving the problem]

[0008] A hair cleanser containing a cleaning component and a conditioning component is diluted with water by lathering on wet hair. During this process, a complex is formed between the cleaning component and the conditioning component (coacervation). This complex is what gives the hair cleaner its rinsing performance. Through investigation, the present inventors have found that by combining a specific acrylic polymer compound, instead of general-purpose cationic cellulose or cationic guar gum, with a cleansing component that has enhanced sebum removal properties from the scalp, the combing force on hair in both a wet and dry state after rinsing is reduced, thereby completing the present invention. That is, in order to solve the above problems, the present invention employs the following configuration.

[0009] [1] A hair cleansing agent comprising: component (A): an anionic surfactant; component (B): an amphoteric surfactant; component (C): a polyglycerol fatty acid ester having an HLB value of 8 or more; and component (P): an acrylic polymer compound having a functional group represented by the following general formula (am) and an amide bond in the side chain.

[0010] [ka] [In the formula, R a and R b R each independently represents an alkyl group or a hydrogen atom. c Z may be an alkyl group or a hydrogen atom, or an alkylene group bonded to the polymer backbone. - represents a counter anion. * represents a bond.]

[0011] [2] The hair cleansing agent according to [1], wherein the component (P) contains a polymeric compound (P1) having a structural unit (u1) represented by the following general formula (u1):

[0012] [ka] [In the formula, R 00 represents -NH- or -O-. 01 R represents a methyl group or a hydrogen atom. 02 R represents an alkylene group having 1 to 6 carbon atoms. 03 , R 04 and R 05 each independently represents an alkyl group having 1 to 5 carbon atoms or a hydrogen atom. - represents a counter anion.

[0013] [3] The hair cleansing agent according to [2], wherein the polymer compound (P1) is a copolymer further having a structural unit (u2) represented by the following general formula (u2):

[0014] [ka] [In the formula, R 06 R represents a methyl group or a hydrogen atom. 07 and R 08 each independently represents an alkyl group having 1 to 5 carbon atoms or a hydrogen atom.]

[0015] [4] The hair cleanser according to any one of [1] to [3], wherein the content of the component (P) is 0.10 to 1.5 mass % based on the total mass of the hair cleanser.

[0016] [5] The hair cleanser according to any one of [1] to [4], wherein the content of the component (C) is 0.5 to 15 mass % based on the total mass of the hair cleanser. Effect of the Invention

[0017] According to the present invention, it is possible to provide a hair cleansing agent that provides an improved feel after rinsing.

[0018] Furthermore, the hair cleansing agent of the present invention can effectively remove excess sebum and dirt from the scalp, and also provides a pleasant feel after rinsing, particularly when used on normal hair, as it allows fingers to easily run through the hair. [Brief description of the drawings]

[0019] [Figure 1] 1 is a graph showing the results of measuring the combing force of normal hair bundles in a wet and dry state after rinsing. [Diagram 2] 1 is a graph showing the results of measuring the combing force of hair in a wet state and a dry state after rinsing, performed on a hair bundle for damaged hair. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] (Hair cleanser) A hair cleansing agent according to one embodiment of the present invention contains: component (A): an anionic surfactant; component (B): an amphoteric surfactant; component (C): a polyglycerol fatty acid ester having an HLB value of 8 or more; component (P): an acrylic polymer compound having a functional group represented by general formula (am) and an amide bond in its side chain; and other components, as required.

[0021] In the present invention, the "hair cleanser" refers to a so-called shampoo, which is used for cleaning the hair and scalp.

[0022] <Component (A): Anionic surfactant> Examples of component (A) include alkyl sulfonates, alkyl sulfates, polyoxyalkylene alkyl ether sulfates, alkylbenzene sulfonates, α-olefin sulfonates, higher fatty acid ester sulfonates, acylated amino acid salts, N-acyl-N-methyl taurine salts, alkyl ether acetates, polyoxyalkylene alkyl ether acetates, fatty acid soaps, alkyl phosphate ester salts, N-lauroyl glutamate, N-palmitoyl glutamate, N-lauroyl-N-ethyl glycine salt, N-lauroyl sarcosine salt, and N-myristoyl-β-alanine salt. Examples of the salt include sodium salts, ammonium salts, and triethanolamine salts.

[0023] The component (A) can use either a single type alone or an appropriate combination of two or more types. The content of component (A) in the hair cleanser of the present embodiment is preferably 4 to 20 mass %, more preferably 5 to 15 mass %, and even more preferably 5 to 10 mass %, relative to the total mass (100 mass %) of the hair cleanser. When the content of component (A) is at least the lower limit of the preferred range, better foaming is achieved, and when it is at most the upper limit of the preferred range, it is easier to prevent the viscosity of the hair cleanser from becoming too high.

[0024] <Component (B): Amphoteric surfactant> Examples of the component (B) include alkyl betaine surfactants, amido betaine surfactants, sulfo betaine surfactants, hydroxy sulfo betaine surfactants, imidazolinium betaine surfactants, amido sulfo betaine surfactants, and phospho betaine surfactants.

[0025] Examples of alkyl betaine surfactants include N-decyl betaine, cetyl betaine, stearyl betaine, coconut oil alkyl betaine, and lauryl dimethylaminoacetate betaine. Examples of amidobetaine surfactants include coconut oil fatty acid amidopropyl betaine, lauric acid amidopropyl betaine, lauric acid amidomethyl betaine, myristic acid amidomethyl betaine, palmitic acid amidomethyl betaine, and stearic acid amidomethyl betaine. Examples of sulfobetaine surfactants include coconut oil alkyl dimethyl sulfopropyl betaine, stearyl dimethyl sulfopropyl betaine, coconut oil alkyl aminomethyl sulfopropyl betaine, stearyl aminomethyl dimethyl sulfopropyl betaine, and myristyl aminomethyl dimethyl sulfopropyl betaine. Examples of hydroxysulfobetaine surfactants include lauryl hydroxysulfobetaine, lauryl aminomethyl-bis-(2-hydroxyethyl)-sulfopropyl betaine, and the like. Examples of the imidazolinium betaine surfactant include 2-coconut oil alkyl-N-carboxyethyl-N-hydroxyethyl imidazolinium betaine, 2-lauryl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine, and the like.

[0026] The component (B) can use either a single type alone or an appropriate combination of two or more types. Among the components (B), alkyl betaine surfactants and amido betaine surfactants are preferred, amido betaine surfactants are more preferred, and coconut oil fatty acid amidopropyl betaine and lauric acid amidopropyl betaine are particularly preferred. The content of component (B) in the hair cleanser of the present embodiment is preferably 3 to 15 mass %, more preferably 4 to 12 mass %, and even more preferably 5 to 10 mass %, relative to the total mass (100 mass %) of the hair cleanser. When the content of component (B) is at least the lower limit of the aforementioned preferred range, the cleaning power and foaming will be better, and when it is no more than the upper limit of the aforementioned preferred range, rinsing performance will be improved and the viscosity of the hair cleanser will be prevented from becoming too high.

[0027] The ratio of component (A) to component (B) in the hair cleanser of this embodiment, expressed as a mass ratio (A) / (B), is preferably from 1 / 2 to 4 / 1, more preferably from 1 / 2 to 2 / 1. If the mass ratio is within this range, the viscosity of the hair cleanser can be easily increased, and the cleaning power and foaming can be further improved.

[0028] <Component (C): Polyglycerol fatty acid ester with HLB of 8 or higher> The HLB value of the component (C) is 8 or more, preferably 8-18, more preferably 10-16, and even more preferably 11-16. When the HLB value of component (C) is equal to or higher than the lower limit, the cleaning power for removing dirt from the hair and scalp is enhanced, whereas when it is equal to or lower than the preferred upper limit, the ability to remove sebum dirt is improved.

[0029] The "HLB" here is expressed as IOB x 10 in the organic conceptual diagram. The IOB in the organic conceptual diagram is the ratio of the inorganic value (IV) to the organic value (OV) in the organic conceptual diagram, that is, "inorganic value (IV) / organic value (OV)". The origin of all organic compounds is methane (CH4), and all other compounds are considered to be derivatives of methane. A certain value is set for each of the carbon number, substituents, transformation parts, rings, etc., and the organic value and inorganic value are calculated by adding up the scores. These values ​​are then plotted on a diagram with the organic value on the X axis and the inorganic value on the Y axis.

[0030] Examples of component (C) include tetraglyceryl monolaurate (HLB 10.4), hexaglyceryl monolaurate (HLB 14.1), decaglyceryl monolaurate (HLB 15.2), decaglyceryl monomyristate (HLB 14.9 to 16.7), decaglyceryl monostearate (HLB 17.5), decaglyceryl monooleate (HLB 13.0 to 15.9), and hexaglyceryl monocaprate (HLB 14.6).

[0031] The component (C) can use either a single compound, or a suitable combination of two or more different compounds. Of the (C) components, decaglyceryl monolaurate, decaglyceryl monomyristate, decaglyceryl monostearate, and decaglyceryl monooleate are preferred from the standpoint of removability and solubility of sebum stains, and decaglyceryl monolaurate is particularly preferred from the standpoint of improved preservative power. The content of component (C) in the hair cleanser of this embodiment is preferably 0.5 to 15 mass%, more preferably 1 to 10 mass%, and even more preferably 1 to 5 mass%, relative to the total mass (100 mass%) of the hair cleanser. When the content of the (C) component is equal to or more than the lower limit of the preferred range, the cleansing power for removing dirt from the hair and scalp is likely to be improved, and when the content is equal to or less than the upper limit of the preferred range, the rinsing performance is likely to be improved.

[0032] The ratio of the (A) component, the (B) component, and the (C) component in the hair cleansing agent of this embodiment, for example, expressed as a mass ratio of the total content of the (A) component and the (B) component to the content of the (C) component, expressed as ((A)+(B)) / (C), is preferably from 3 to 10, more preferably from 3.5 to 8, and even more preferably from 4 to 6. If the mass ratio is within this range, when combined with component (P), better detergency and post-rinsing feel are more likely to be achieved.

[0033] <Component (P): Acrylic polymer compound> The component (P) in this embodiment is an acrylic polymer compound having a functional group represented by the following general formula (am) and an amide bond in the side chain.

[0034] The term "acrylic polymer compound" as used herein broadly includes polymers having structural units derived from monomers containing the structure H2C=CR-C(=O)-* [R represents, for example, a methyl group or a hydrogen atom. * represents a bond.] in addition to polyacrylic acid esters and polymethacrylic acid esters. An "amide bond" refers to the bond between a carbonyl group and the nitrogen.

[0035] [ka] [In the formula, R a and R b R each independently represents an alkyl group or a hydrogen atom. c Z may be an alkyl group or a hydrogen atom, or an alkylene group bonded to the polymer backbone. - represents a counter anion. * represents a bond.]

[0036] In the above formula (am), R a and R b R each independently represents an alkyl group or a hydrogen atom. a and R b The alkyl group in each of the above is preferably an alkyl group having 1 to 5 carbon atoms, more preferably an alkyl group having 1 to 3 carbon atoms, and further preferably a methyl group.

[0037] In the above formula (am), R c may be an alkyl group or a hydrogen atom, or an alkylene group bonded to the polymer backbone. R c The alkyl group in is preferably an alkyl group having 1 to 5 carbon atoms, more preferably an alkyl group having 1 to 3 carbon atoms, and further preferably a methyl group. Also, R c may be an alkylene group and may be bonded to the polymer main chain. In this case, R cis the polymer main chain and N + may form a ring structure together with

[0038] In the above formula (am), Z - represents a counter anion. Z - Examples of the counter anion in the above formula include bromide ion, chloride ion, acetate ion, borate ion, citrate ion, tartrate ion, hydrogen sulfate ion, hydrogen sulfite ion, sulfate ion, and phosphate ion.

[0039] ≪High molecular compound (P1)≫ A preferred example of the component (P) is a polymeric compound (P1) (hereinafter also referred to as “component (P1)”) having a structural unit (u1) represented by the following general formula (u1):

[0040] [ka] [In the formula, R 00 represents -NH- or -O-. 01 R represents a methyl group or a hydrogen atom. 02 R represents an alkylene group having 1 to 6 carbon atoms. 03 , R 04 and R 05 each independently represents an alkyl group having 1 to 5 carbon atoms or a hydrogen atom. - represents a counter anion.

[0041] [Unit of Construction (u1)] In the formula (u1), R 00 represents -NH- or -O-. In the formula (u1), R 01 represents a methyl group or a hydrogen atom. In the formula (u1), R 02 R represents an alkylene group having 1 to 6 carbon atoms. 02 The alkylene group in the formula (I) is preferably an alkylene group having 2 to 4 carbon atoms, and more preferably an alkylene group having 3 carbon atoms. In the formula (u1), R 03 , R 04 and R 05R each independently represents an alkyl group having 1 to 5 carbon atoms or a hydrogen atom. 03 , R 04 and R 05 The alkyl group in each of the above is an alkyl group having 1 to 5 carbon atoms, preferably an alkyl group having 1 to 3 carbon atoms, and more preferably a methyl group.

[0042] In the formula (u1), Z - represents a counter anion. Z - Examples of the counter anion in the formula (I) include bromide ion, chloride ion, acetate ion, borate ion, citrate ion, tartrate ion, hydrogen sulfate ion, hydrogen sulfite ion, sulfate ion, and phosphate ion, and chloride ion is preferred.

[0043] Specific examples of the structural unit (u1) are shown below. In each of the following formulas, R 01 represents a methyl group or a hydrogen atom.

[0044] [ka]

[0045] The structural unit (u1) contained in the component (P1) may be of one type alone, or may be of two or more types. The proportion of the structural unit (u1) in the component (P1) is preferably 20 mol % or more, and more preferably 30 mol % or more, relative to the total (100 mol %) of all structural units constituting the component (P1), and may be 100 mol % (i.e., a homopolymer).

[0046] When the component (P1) is a copolymer having the structural unit (u1), the proportion of the structural unit (u1) in the component (P1) is preferably 20 to 80 mol %, more preferably 30 to 75 mol %, and even more preferably 35 to 70 mol %, relative to the total (100 mol %) of all structural units constituting the component (P1).

[0047] When the proportion of the structural unit (u1) in the component (P1) is within the above preferred range, the post-rinse feel is more easily improved.

[0048] [Unit of Construction (u2)] When the component (P1) is a copolymer having the structural unit (u1), the component (P1) is preferably a copolymer having, in addition to the structural unit (u1), a structural unit (u2) represented by the following general formula (u2):

[0049] [ka] [In the formula, R 06 R represents a methyl group or a hydrogen atom. 07 and R 08 each independently represents an alkyl group having 1 to 5 carbon atoms or a hydrogen atom.]

[0050] In the formula (u2), R 06 represents a methyl group or a hydrogen atom. In the formula (u2), R 07 and R 08 each independently represents an alkyl group having 1 to 5 carbon atoms or a hydrogen atom. R 07 and R 08 The alkyl group in each of the above is an alkyl group having 1 to 5 carbon atoms, preferably an alkyl group having 1 to 3 carbon atoms, and more preferably a methyl group.

[0051] Specific examples of the structural unit (u2) are shown below. In each of the following formulas, R 06 represents a methyl group or a hydrogen atom.

[0052] [ka]

[0053] The structural unit (u2) contained in the component (P1) may be of one type alone, or may be of two or more types. The proportion of the structural unit (u2) in the component (P1) is preferably 20 to 80 mol %, more preferably 25 to 70 mol %, and even more preferably 30 to 65 mol %, based on the total (100 mol %) of all structural units constituting the component (P1).

[0054] When the proportion of the structural unit (u2) in the component (P1) is within the above-mentioned preferred range, the hair tends to feel smooth to the touch and resistant to tangling, particularly for normal hair, when rinsing.

[0055] In the hair cleansing agent of this embodiment, a suitable component (P1) is the above structural unit (u1) (R 00 is -NH-) repeating units; 00 is -NH-) and the above structural unit (u2) (R 07 and R 08 are both hydrogen atoms); 00 is -O-) and the above structural unit (u1) (R 00 is -NH-) and the above structural unit (u2) (R 07 and R 08 and (wherein each of the groups is a methyl group)

[0056] The weight average molecular weight (Mw) of the component (P1) (based on polystyrene conversion by gel permeation chromatography) is not particularly limited, but is preferably from 50,000 to 700,000, and more preferably from 100,000 to 500,000.

[0057] ≪High molecular compound (P2)≫ Furthermore, a preferred example of the (P) component is a polymeric compound (P2) (hereinafter also referred to as "component (P2)") having a structural unit derived from an allylammonium salt and a structural unit derived from a monomer having an amide bond. Examples of allyl ammonium salts include diallyl dimethyl ammonium chloride, tetraallyl ammonium chloride, etc. Among these, diallyl dimethyl ammonium chloride is preferred. Examples of monomers having an amide bond include acrylamide and methacrylamide.

[0058] The component (P2) may further contain other structural units in addition to the structural units derived from an allylammonium salt and the structural units derived from a monomer having an amide bond. Examples of other structural units include structural units derived from acrylic acid and structural units derived from methacrylic acid.

[0059] In the hair cleansing agent of this embodiment, suitable examples of the component (P2) include a binary copolymer having a structural unit derived from an allylammonium salt and a structural unit derived from a monomer having an amide bond; and a ternary copolymer having a structural unit derived from an allylammonium salt, a structural unit derived from a monomer having an amide bond, and a structural unit derived from acrylic acid or methacrylic acid.

[0060] The weight average molecular weight (Mw) of the component (P2) (based on polystyrene conversion by gel permeation chromatography) is not particularly limited, but is preferably from 250,000 to 1,000,000, and more preferably from 300,000 to 800,000.

[0061] In the hair cleansing agent of the present embodiment, the component (P) may be used alone or in appropriate combination of two or more types. Among the (P) components, the (P1) component is preferred because it provides a good feeling after rinsing, specifically, because components derived from the hair cleanser are less likely to remain on the hair, and it allows fingers to be easily run through the hair, particularly on normal hair.

[0062] The content of the component (P) in the hair cleanser of this embodiment is preferably 0.10 to 1.5 mass%, more preferably 0.20 to 1.0 mass%, and even more preferably 0.30 to 0.80 mass%, relative to the total mass (100 mass%) of the hair cleanser. When the content of the component (P) is at least as high as the lower limit of the preferred range, rinsing performance is more likely to be improved, whereas when the content is at most the upper limit of the preferred range, components derived from the hair cleanser are less likely to remain in excess on the hair after rinsing.

[0063] The ratio of component (P) to component (C) in the hair cleansing agent of the present embodiment, for example, expressed as the mass ratio (C) / (P) of the content of component (C) to the content of component (P), is preferably from 2 to 30, more preferably from 5 to 15, and even more preferably from 6 to 10. Within this mass ratio range, it becomes easier to achieve both better cleaning power and a good feel after rinsing.

[0064] <Other ingredients> The hair cleansing agent of the present embodiment may contain other components, in addition to the components (A), (B), (C) and (P), as necessary. As other components, those that are typically used in hair cleansers can be used as appropriate within the scope of the invention, such as solvents, cationic surfactants, nonionic surfactants other than component (C), polymers other than component (P), fragrances, moisturizers, pH adjusters, solubilizers, viscosity adjusters, bactericides, preservatives, colorants, and various appealing components.

[0065] The hair cleansing agent of the present embodiment can be produced, for example, by mixing components (A), (B), (C) and (P) with other components and the remaining solvent, and dissolving each component in the solvent.

[0066] In the hair cleansing agent of this embodiment, the pH of a solution obtained by dissolving the components (A), (B), (C) and (P) in a solvent at 25°C is, for example, preferably in the range of 3.5 to 7.0, more preferably in the range of 4.0 to 6.0, and even more preferably in the range of 4.5 to 5.5. The pH of hair cleansers can be measured using the method specified in the general testing methods of the Standards for Cosmetic Ingredients (2nd Edition) by inserting the electrodes of a pH meter directly into the hair cleanser and reading the pH value after it has stabilized.

[0067] In the hair cleansing agent of this embodiment, the viscosity of a solution obtained by dissolving the components (A), (B), (C) and (P) in a solvent at 25°C is, for example, preferably in the range of 500 to 3000 mPa s, and more preferably in the range of 1000 to 2000 mPa s. The viscosity of the hair cleanser is calculated in accordance with the second method of the Cosmetic Raw Materials Standards using a BM type viscometer with rotor No. 4 (No. 3 for low viscosity products) from the reading after rotating the rotor at 6 rpm for 1 minute.

[0068] The hair cleansing agent of the present embodiment described above uses a combination of components (A), (B), and (C) as cleansing components, and employs a specific acrylic polymer compound as a conditioning component. In the hair cleansing agent of this embodiment, the ability to remove sebum from the scalp is enhanced by the cleansing components that are a combination of three components including component (C). In addition, the use of a specific acrylic polymer compound instead of the general-purpose cationic cellulose or cationic guar gum improves the rinsing performance, i.e., the components derived from the hair cleanser (complex of cleaning components and conditioning components) are less likely to remain on the hair after rinsing, improving the feel after rinsing.

[0069] Furthermore, by selecting a specific type of acrylic polymer compound, it becomes easier to achieve a feeling of hair that is easy to run your fingers through and less prone to tangling when rinsing with running water, and this feeling can be imparted particularly to normal hair.

[0070] The reason why the hair cleansing agent of the present embodiment has such an effect is not clear, but is presumed to be as follows. In the case of a complex containing a conventionally used cationic cellulose or cationic guar gum as a conditioning component, it is considered that the complex is adsorbed to the hair surface during rinsing in running water due to hydrophobic interaction between the complex and the hair surface. In addition, the complex formed is prone to aggregation and is relatively large in size compared to the complexes described below. In the case of the complex containing a specific acrylic polymer compound as a conditioning component, which is used in this embodiment, it is believed that the complex is adsorbed to the hair surface during rinsing in running water due to hydrophobic interaction and hydrogen bonding force between the complex and the hair surface. In addition, the complex formed is less likely to aggregate and is relatively smaller in size than the former. It is presumed that due to these differences between the two, the hair cleansing agent of this embodiment provides an improved feel after rinsing. EXAMPLES

[0071] The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to these examples.

[0072] <Ingredients used> In the examples and comparative examples, the components shown below were used.

[0073] Component (A): Anionic surfactant A-1: Sodium laureth sulfate (sodium polyoxyethylene lauryl ether sulfate), product name "EMAL E-27C", manufactured by Kao Corporation

[0074] (B) Component: amphoteric surfactant B-1: Lauramidopropyl betaine, product name "Softazoline LPB-R", manufactured by Kawaken Fine Chemicals Co., Ltd.

[0075] (C) Ingredient: Polyglycerol fatty acid ester with HLB of 8 or higher C-1: Polyglyceryl-10 laurate (polyglyceryl monolaurate), trade name "Glysurf S-10ML", manufactured by Aoki Oil & Fat Co., Ltd.; HLB 15.2

[0076] (P) Component: Acrylic polymer compound P-1: Polyquaternium-39 (acrylic acid / diallyldimethylammonium chloride / acrylic acid amide copolymer), product name "DOCQUAT 39H", manufactured by DOC Japan Co., Ltd.

[0077] P-2: Polyacrylamide propyltrimonium chloride, trade name "N-DurHance A-1000", manufactured by Ashland; weight average molecular weight (Mw) 200,000, purity 21% by mass

[0078] P-3: Acrylamide propyltrimonium chloride / acrylamide copolymer, product name "AA-2000", manufactured by Ashland Corporation; weight average molecular weight (Mw) 250,000, purity 20% by mass

[0079] P-4: Polyquaternium-73, product name "Diasleek C-802", manufactured by Mitsubishi Chemical Corporation; weight average molecular weight (Mw) 400,000, purity 20% by mass

[0080] (P') component: Comparative component of (P) component P'-1: Polyquaternium-10 (cationized cellulose; O-[2-hydroxy-3-(trimethylammonio)propyl]hydroxyethyl cellulose chloride), trade name "Catinal HC-100", manufactured by Toho Chemical Industry Co., Ltd.; pure content 100% by mass

[0081] P'-2: Guar hydroxypropyltrimonium chloride (cationized guar gum), trade name "Jaguar C-13S", manufactured by Sansho Co., Ltd.; pure content 100% by mass

[0082] Other Ingredients Moisturizer: Butylene glycol, product name "1,3-butylene glycol UK", manufactured by Daicel Corporation Moisturizer: Propylene glycol, product name "Propylene Glycol", manufactured by Dow Chemical Japan Co., Ltd. Moisturizer: Sorbitol, product name "Sorbitol", manufactured by Kao Corporation pH adjuster: Citric acid, product name "Citric Acid", manufactured by Showa Kako Co., Ltd. Solubilizer: PEG-20 hydrogenated castor oil, product name "Pegnol HC-20", manufactured by Toho Chemical Industry Co., Ltd. Viscosity modifier: Sodium chloride, product name "Sodium Chloride", manufactured by Tomita Pharmaceutical Co., Ltd. Solvent: Water, product name "Purified Water (Pharmacopoeia)", manufactured by Kosakai Pharmaceutical Co., Ltd.

[0083] <Preparation of hair cleanser> (Examples 1 to 4, Comparative Examples 1 to 2) Each hair cleanser was prepared as follows so as to have the composition and content shown in Table 1 below. It should be noted that Example 1 is treated as a reference example. Specifically, component (P) or component (P') was dispersed in water as a solvent while heating, and component (A), component (B), component (C), and other components were added in sequence at 80°C while mixing and dissolving, thereby obtaining the hair cleansing agent of each example.

[0084] In Table 1, the numerical value of each component indicates the content of each component in the hair cleanser, and means the ratio to the total mass of the hair cleanser (mass %; pure content equivalent). The pH of the hair cleanser was measured using a pH meter (product name HM-30G, manufactured by DKK-TOA Corporation) by inserting the pH meter electrode directly into the hair cleanser adjusted to 25°C and reading the pH value after it had stabilized. The viscosity of the hair cleanser was measured using a BM type viscometer with rotor No. 4. The viscosity was calculated from the reading after rotating the rotor at 6 rpm for 1 minute for the hair cleanser adjusted to 25°C.

[0085] [Table 1]

[0086] <Evaluation> A bundle of hair was washed using the hair cleanser of each example, and the combing force of the hair in a wet state and in a dry state after rinsing was measured to evaluate the feel after rinsing.

[0087] [Preparing the hair bundle] A 10cm long bundle of hair (1g) that was purchased as an undamaged bundle of hair was used as the bundle for normal hair. In addition, 1 g of a 10 cm long hair bundle purchased as an undamaged hair bundle was treated with a commercially available bleach (manufactured by Mandom Corporation) for twice the treatment time specified in the instruction manual, rinsed with water, and then dried before being used as a hair bundle for damaged hair.

[0088] [Combing force measurement; after rinsing, in wet condition] Procedure (1): 1 g of hair bundles each having a length of 10 cm for normal hair and damaged hair were wetted with warm water at 40°C and lightly squeezed, and 0.1 g of the sample hair cleanser was applied to the entire wet hair bundle, spreading it evenly. Step (2): The hair bundle to which the sample had been applied was immersed in 10 mL of 40°C warm water and rinsed twice, after which it was lightly squeezed so that no water dripped off. Step (3): After lightly wringing the hair bundle, the hair bundle was combed five times, and then the measurement of the combing force was started. Step (4): The tensile strength was measured after at least eight combing passes. The tensile strength was measured using Imada's ZTA / ZTS series force gauge, model DST-2N. The tensile strength was measured by fixing the force gauge, suspending the hair bundle, and combing the hair bundle. That is, the maximum load was measured when the comb was held perpendicular to the length of the hair bundle and passed straight downward in the direction of gravity. In addition, the tensile strength was measured by excluding the average value of multiple measurements taken after the first one or two combing passes, as well as any abnormal values ​​that occurred when the comb happened to get caught on a strand of hair.

[0089] [Combing force measurement; after rinsing, in a dry state] The above steps (1) and (2) were carried out in the same manner. After step (2), the hair bundle was lightly squeezed and then allowed to dry naturally at room temperature (25°C) for 24 hours. After that, the naturally dried hair bundle was combed five times, and then the measurement of the combing load (combing force) was started. Then, the above procedure (4) was repeated to measure the tensile strength during combing.

[0090] For each example of the hair cleanser, the combing force of the hair in a wet state after rinsing and in a dry state was measured, and the results are shown in FIG. 1 and FIG. The vertical axis indicates the tensile strength (unit: N (Newton)) during combing.

[0091] FIG. 1 is a graph showing the results of measurements of combing force on normal hair bundles in a wet state after rinsing and in a dry state. FIG. 2 is a graph showing the results of measuring the combing force of hair in a wet state after rinsing and in a dry state, performed on a hair bundle for damaged hair.

[0092] From the results shown in FIG. 1, it can be seen that when the hair cleansers of Examples 1 to 4 according to the present invention were used, the combing load of hair in a dry state after rinsing was kept lower than when the hair cleansers of Comparative Examples 1 and 2 were used. This is thought to be because when the hair cleansers of Examples 1 to 4 were used, components derived from the hair cleanser were less likely to remain on the hair of a normal hair bundle after rinsing.

[0093] It can also be seen that when the hair cleansers of Examples 2 and 3 are used, the combing load on the hair in a wet state after rinsing is further reduced compared to when the hair cleansers of Comparative Examples 1 and 2 are used. It is considered that, when the hair cleansing agents of Examples 2 and 3 are used, the hair tends to have a feeling of being easy to run fingers through during rinsing and being less prone to tangling.

[0094] The results shown in FIG. 2 confirm that when the hair cleansers of Examples 1, 2, and 4 according to the present invention were used, the combing load on the hair in a dry state after rinsing was lower than when the hair cleansers of Comparative Examples 1 and 2 were used. This is thought to be because when the hair cleansers of Examples 1, 2, and 4 are used, in hair bundles for damaged hair, excess components derived from the hair cleansers are less likely to remain on the hair after rinsing.

Claims

1. Component (A): an anionic surfactant; Component (B): an amphoteric surfactant, (C) component: a polyglycerol fatty acid ester having an HLB of 8 or more; Component (P): an acrylic polymer compound having a functional group represented by the following general formula (am) and an amide bond in a side chain, A hair cleansing agent comprising: The ratio of the (A) component to the (B) component and the (C) component is such that the total content of the (A) component and the (B) component relative to the content of the (C) component is: the mass ratio represented by ((A)+(B)) / (C) is from 3 to 10; The content of the component (P) is 0.10 to 1.5% by mass based on the total mass of the hair cleanser, a ratio of the component (P) to the component (C), expressed as a mass ratio (C) / (P) of the content of the component (C) to the content of the component (P), is 5 to 10; The hair cleansing agent, wherein the component (P) contains a polymeric compound (P1) having a structural unit (u1) represented by the following general formula (u1): 【Chemistry 1】 [In the formula, R ａ and R ｂ R each independently represents an alkyl group or a hydrogen atom. ｃ Z may be an alkyl group or a hydrogen atom, or an alkylene group bonded to the polymer backbone. － represents a counter anion. * represents a bond. 【Chemistry 2】 [In the formula, R 00 represents —NH—. R 01 represents a methyl group or a hydrogen atom. R 02 represents an alkylene group having 1 to 6 carbon atoms. R 03 , R 04 and R 05 each independently represent an alkyl group having 1 to 5 carbon atoms or a hydrogen atom. Z − represents a counter anion.]

2. The hair cleansing agent according to claim 1 , wherein the polymer compound (P1) is a copolymer further having a structural unit (u2) represented by the following general formula (u2): 【Chemistry 3】 [In the formula, R ０６ R represents a methyl group or a hydrogen atom. ０７ and R ０８ each independently represents an alkyl group having 1 to 5 carbon atoms or a hydrogen atom.

3. The hair cleanser according to claim 1 or 2, wherein the content of the component (C) is 0.5 to 15% by mass based on the total mass of the hair cleanser.

4. A hair cleansing agent described in any one of claims 1 to 3, wherein the proportion of the structural unit (u1) in the polymer compound (P1) is 20 mol % or more relative to the total (100 mol %) of all structural units constituting the polymer compound (P1).

5. A hair cleansing agent described in any one of claims 1 to 4, wherein the ratio of the (A) component to the (B) component, expressed as a mass ratio (A) / (B), is 1 / 2 to 2 / 1.

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