Hair cosmetic composition

Abstract

To provide a hair cosmetic composition that exhibits excellent tensile strength and softness of hair after drying, and also has excellent hair frizz suppression effects in high humidity environments. [Solution] A hair cosmetic composition comprising (A) isoprene glycol, and (B) one or more selected from polyoxyethylene phytosterol having an average number of moles of ethylene oxide added of 10 or more and 40 or less, and branched polyoxyethylene alkyl ether or branched polyoxyethylene alkenyl ether having 14 or more carbon atoms and an average number of moles of ethylene oxide added of 10 or more and 40 or less, wherein the content of component (A) is 21% by mass or more and 60% by mass or less of the total amount of the hair cosmetic composition, and the mass ratio of the content of component (A) to the content of component (B) [(A) / (B)] is 1.5 or more and 40 or less.

Description

Technical Field

[0001] The present invention relates to a hair cosmetic composition. Background Art

[0002] It is known that when hair undergoes chemical treatment such as hair coloring or bleaching, physical treatment such as combing, and thermal damage from hair dryers, hair straighteners and the like, not only the cuticle on the hair surface peels off, but also hair components (proteins, amino acids, lipids, etc.) are eluted, resulting in heterogeneous localization of hydrophobic substances and hydrophilic substances inside the hair. When the balance between hydrophobic substances and hydrophilic substances inside the hair is disrupted, when a large amount of moisture enters and exits, such as after drying with a hair dryer or in a high-humidity environment, the localization of moisture inside the hair becomes more heterogeneous, which causes waving and makes the hair spread out and difficult to manage.

[0003] Conventionally, as one means for solving such problems, compositions have been proposed in which cationic polymers having high adsorptivity to hair surfaces and oily agents such as highly polymerized and amino-modified silicones are blended into shampoos and conditioners for in-bath use, treatments for out-bath use, and the like (see, for example, Patent Documents 1 to 2). However, conventional hair cosmetic compositions including the compositions described in Patent Documents 1 to 2 can temporarily suppress hair spreading, but the effect of suppressing hair spreading when a large amount of moisture enters and exits is not sufficient, leaving room for improvement.

[0004] Furthermore, it is known that hair with an impaired balance between hydrophobic substances and hydrophilic substances inside the hair has reduced strength and is prone to hair breakage and split ends. In order to prevent and repair these problems, hair repair agent compositions that repair the surface and interior of hair with proteins and protein hydrolysates, hair cosmetics that repair the interior with organic acids, and the like have been proposed (see, for example, Patent Documents 3 to 4). However, in conventional hair cosmetic compositions including those described in Patent Documents 3-4, the hair becomes hard and stiff after drying, making it difficult to achieve both a soft feel and improved hair strength.

[0005] Therefore, a hair cosmetic composition that exhibits excellent tensile strength and softness of hair after drying, as well as excellent hair frizz suppression in high-humidity environments, has not yet been provided, and its rapid development is strongly desired. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2007-031379 [Patent Document 2] Japanese Patent Publication No. 2013-136565 [Patent Document 3] Japanese Patent Application Publication No. 10-175824 [Patent Document 4] Japanese Patent Publication No. 2002-029938 [Overview of the project] [Problems that the invention aims to solve]

[0007] This embodiment aims to solve the aforementioned problems of the conventional approach and achieve the following objectives. Specifically, it aims to provide a hair cosmetic composition that exhibits excellent tensile strength and softness of hair after drying, and also has an excellent effect in suppressing hair frizz in high-humidity environments. [Means for solving the problem]

[0008] The present inventors have conducted extensive research to achieve the above objectives and have found that the hair cosmetic composition of this embodiment contains (A) isoprene glycol, (B) polyoxyethylene phytosterol having an average number of moles of ethylene oxide added of 10 to 40, and one or more branched polyoxyethylene alkyl ethers or branched polyoxyethylene alkenyl ethers having 14 to 20 carbon atoms and an average number of moles of ethylene oxide added of 10 to 40, wherein the content of component (A) is 21% to 60% by mass of the total amount of the hair cosmetic composition, and the mass ratio of the content of component (A) to the content of component (B) [(A) / (B)] is 1.5 to 40, resulting in excellent tensile strength and softness of hair after drying, and excellent effect in suppressing hair frizz in high humidity environments.

[0009] This embodiment is based on the aforementioned findings by the inventors, and the means for solving the aforementioned problems are as follows. <1> (A) Isoprene glycol and (B) One or more selected from polyoxyethylene phytosterols having an average number of ethylene oxide additions of 10 or more and 40 or less, and branched polyoxyethylene alkyl ethers or branched polyoxyethylene alkenyl ethers having 14 or more carbon atoms and an average number of ethylene oxide additions of 10 or more and 40 or less, A hair cosmetic composition containing, The content of component (A) is 21% by mass or more and 60% by mass or less based on the total amount of the hair cosmetic composition. The hair cosmetic composition is characterized in that the mass ratio of the content of component (A) to the content of component (B) [(A) / (B)] is 1.5 or more and 40 or less. <2> The content of component (A) is 30% by mass or more and 50% by mass or less based on the total amount of the hair cosmetic composition. The content of component (B) is 3% by mass or more and 10% by mass or less based on the total amount of the hair cosmetic composition. <1> This is the hair cosmetic composition described in [reference]. [Effects of the Invention]

[0010] According to this embodiment, the aforementioned problems of the conventional method can be solved, the aforementioned objectives can be achieved, and a hair cosmetic composition can be provided that exhibits excellent tensile strength and softness of hair after drying, and excellent hair frizz suppression effect in high humidity environments. [Modes for carrying out the invention]

[0011] (Hair cosmetic composition) The hair cosmetic composition of this embodiment contains (A) isoprene glycol, (B) polyoxyethylene phytosterol having an average number of ethylene oxide additions of 10 to 40, and one or more branched polyoxyethylene alkyl ethers or branched polyoxyethylene alkenyl ethers having 14 to 20 carbon atoms and an average number of ethylene oxide additions of 10 to 40, and may contain other components as needed.

[0012] In this specification, (A) isoprene glycol may be referred to as "(A)" or "component (A)", and (B) one or more selected from polyoxyethylene phytosterols having an average number of ethylene oxide additions of 10 or more and 40 or less, and branched polyoxyethylene alkyl ethers or branched polyoxyethylene alkenyl ethers having 14 or more carbon atoms and an average number of ethylene oxide additions of 10 or more and 40 or less, may be referred to as "(B)" or "component (B)".

[0013] A hair cosmetic composition containing component (A) and component (B) can efficiently penetrate various components into the hair, thereby increasing the strength of damaged hair while maintaining its softness, and improving frizz in high-humidity environments.

[0014] <(A) Isoprene Glycol> The component (A) is contained in the hair cosmetic composition to impart an effect of improving hair tensile strength after drying and an effect of suppressing hair spreading under high humidity environments.

[0015] As the isoprene glycol of component (A), an appropriately synthesized product may be used, or a commercially available product may be used. Examples of commercially available isoprene glycol include Isoprene Glycol-S (manufactured by Kuraray Co., Ltd.) under the trade name.

[0016] The content of component (A), from the viewpoint of obtaining favorable effects of improving hair tensile strength after drying and suppressing hair spreading under high humidity environments, is 21% by mass or more and 60% by mass or less based on the total amount of the hair cosmetic composition, and preferably 30% by mass or more and 50% by mass or less.

[0017] When the content of component (A) is 21% by mass or more based on the total amount of the hair cosmetic composition, the effect of improving hair tensile strength after drying and the effect of suppressing hair spreading under high humidity environments become favorable.

[0018] When the content of component (A) is 60% by mass or less based on the total amount of the hair cosmetic composition, the effect of improving hair tensile strength after drying and the effect of suppressing hair spreading under high humidity environments become favorable.

[0019] <(B) One or more selected from polyoxyethylene phytosterols having an average addition mole number of ethylene oxide of 10 or more and 40 or less, and branched polyoxyethylene alkyl ethers or branched polyoxyethylene alkenyl ethers having 14 to 20 carbon atoms and an average addition mole number of ethylene oxide of 10 or more and 40 or less> The component (B) is contained in the hair cosmetic composition to impart an effect of improving hair tensile strength after drying and an effect of suppressing hair spreading under high humidity environments.

[0020] There are no particular restrictions on the aforementioned component (B), and it can be appropriately selected according to the purpose. However, from the viewpoint of improving the tensile strength of hair after drying and suppressing hair spreading in a high humidity environment, polyoxyethylene phytosterol with an average number of moles of ethylene oxide added of 10 to 40 is preferred, and branched polyoxyethylene alkyl ethers with 16 to 20 carbon atoms and an average number of moles of ethylene oxide added of 10 to 40 are preferred. Polyoxyethylene phytosterol with an average number of moles of ethylene oxide added of 15 to 35 is preferred, and branched polyoxyethylene alkyl ethers with 17 to 19 carbon atoms and an average number of moles of ethylene oxide added of 15 to 35 are more preferred.

[0021] A specific example of a branched polyoxyethylene alkyl ether having 16 to 20 carbon atoms and an average number of ethylene oxide additions of 10 to 40 is polyoxyethylene isostearyl. ether Examples include polyoxyethylene 2-hexyldecyl ether (average number of moles of ethylene oxide added is 10 to 40), polyoxyethylene octyldodecyl ether (average number of moles of ethylene oxide added is 10 to 40), and polyoxyethylene octyldodecyl ether (average number of moles of ethylene oxide added is 10 to 40).

[0022] A specific example of a branched polyoxyethylene alkyl ether having 17 to 19 carbon atoms and an average number of ethylene oxide addition moles of 15 to 35 is polyoxyethylene isostearyl. ether Examples include (an average number of moles of ethylene oxide added is 15-35).

[0023] The aforementioned component (B) may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available products of component (B) include, by trade name, EMALEX PS-30 (polyoxyethylene phytosterol, average number of moles of ethylene oxide added: 30, manufactured by Nippon Emulsion Co., Ltd.), NIKKOL BPS-30 (polyoxyethylene phytosterol, average number of moles of ethylene oxide added: 30, manufactured by Nikko Chemicals Co., Ltd.), and EMALEX 1820 (polyoxyethylene isostearyl). ether Examples include, ethylene oxide average number of added moles: 20 (manufactured by Nippon Emulsion Co., Ltd.).

[0024] There are no particular restrictions on the content of component (B) and it can be appropriately selected depending on the purpose, but from the viewpoint of having a good effect on improving the tensile strength of hair after drying and suppressing hair spreading in a high humidity environment, it is preferable that it be 1% by mass or more and 15% by mass or less, and more preferably 3% by mass or more and 10% by mass or less, based on the total amount of the hair cosmetic composition.

[0025] When the content of component (B) is 1% by mass or more relative to the total amount of the hair cosmetic composition, the effect of improving the tensile strength of the hair after drying and the effect of suppressing hair spreading in a high humidity environment are good.

[0026] When the content of component (B) is 15% by mass or less of the total amount of the hair cosmetic composition, the effect of improving the tensile strength of the hair after drying and the effect of suppressing hair spreading in a high humidity environment are good.

[0027] <Mass ratio [(A) / (B)]> The mass ratio of the content of component (A) to the content of component (B) [(A) / (B)] is 1.5 or more and 40 or less, preferably 3 or more and 16 or less.

[0028] When the mass ratio [(A) / (B)] is 1.5 or higher, the effects of improving the tensile strength of the hair after drying, suppressing hair spreading in high humidity environments, and improving the softness of the hair after drying are achieved.

[0029] When the mass ratio [(A) / (B)] is 40 or less, the effects of improving the tensile strength of the hair after drying, suppressing hair spreading in high humidity environments, and improving the softness of the hair after drying are achieved.

[0030] <Other ingredients> In addition to the components (A) to (B) described above, the hair cosmetic composition of this embodiment may also contain other components, as long as they do not impair the effects of this embodiment.

[0031] The aforementioned other components are not particularly limited and can be appropriately selected according to the purpose. Examples include surfactants other than component (B), lower alcohols, higher alcohols, fatty acids, oils, silicones, humectants such as polyhydric alcohols and sugar alcohols other than component (A), thickeners, gelling agents, powders, water-soluble polymers, film-forming agents, resins, UV absorbers, antibacterial agents, fragrances, pigments, opacifiers, preservatives, deodorants, salts, pH adjusters, cooling agents, animal and microbial extracts, plant extracts, blood circulation promoters, astringents, anti-dandruff agents, anti-seborrheic agents, whitening agents, anti-inflammatory agents, cell activators, chelating agents, keratolytic agents, enzymes, hormones, and vitamins. These can be used individually or in combination of two or more.

[0032] The content of the other components mentioned above is not particularly limited, as long as it does not impair the effects of this embodiment, and can be set appropriately according to the purpose.

[0033] The other components mentioned above may be synthesized as appropriate, or commercially available products may be used.

[0034] <<Surfactants>> Examples of the aforementioned surfactants include anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants.

[0035] <<<Cational surfactants>>> The cationic surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include alkylamine salts, fatty acid amideamine salts, alkyltrimethylammonium salts, dialkyldimethylammonium salts, and alkyldimethylbenzylammonium salts.

[0036] <<<Amphoteric surfactants>>> The aforementioned amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include betaine-type amphoteric surfactants and amino acid-type amphoteric surfactants. Among these, betaine-type amphoteric surfactants are preferred. These can be used individually or in combination of two or more.

[0037] The betaine-type amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include alkylbetaine-type amphoteric surfactants, amidebetaine-type amphoteric surfactants, sulfobetaine-type amphoteric surfactants, and imidazoline-type amphoteric surfactants. These may be used individually or in combination of two or more types.

[0038] The alkylbetaine-type amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include lauryldimethylaminoacetic acid betaine, coconut oil alkyl betaine, and stearyldimethylaminoacetic acid betaine. These can be used individually or in combination of two or more.

[0039] The aforementioned amidobetaine-type amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include lauric acid amidopropyl betaine, coconut oil fatty acid amidopropyl betaine, and palm kernel oil fatty acid amidopropyl betaine. These can be used individually or in combination of two or more.

[0040] The sulfobetaine-type amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include lauryl hydroxysulfobetaine, lauramidopropyl hydroxysultaine, coconut oil fatty acid dimethylamino hydroxysulfobetaine, and lauryl dimethylamino hydroxysulfobetaine. These can be used individually or in combination of two or more.

[0041] The imidazoline-type amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include sodium N-lauroyl-N'-carboxymethyl-N'-hydroxyethylethylenediamine, sodium N-coconut oil fatty acid acyl-N'-carboxymethyl-N'-hydroxyethylethylenediamine, and 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine. These can be used individually or in combination of two or more.

[0042] The aforementioned amphoteric surfactant may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available amphoteric surfactants include, for example, alkyl betaine-type amphoteric surfactants such as Amhitol 24B (lauryldimethylaminoacetic acid betaine, manufactured by Kao Corporation), Nissan Anon® BL (lauryldimethylaminoacetic acid betaine, manufactured by NOF Corporation), NIKKOL AM-301 (lauryldimethylaminoacetic acid betaine, manufactured by Nikko Chemicals Co., Ltd.), Amogen® S (lauryldimethylaminoacetic acid betaine, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), and Amogen SH (lauryldimethylaminoacetic acid betaine, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.); amide betaine-type amphoteric surfactants such as Enerdicol L-30B (lauric acid amidopropyl betaine, manufactured by Lion Specialty Chemicals Corporation), Nissan Anon BDF-SF (coconut oil fatty acid amidopropyl betaine, manufactured by NOF Corporation), and Obazolin CAG-30 (coconut oil fatty acid amidopropyl betaine, manufactured by Toho Chemical Industry Co., Ltd.); and Amhitol Examples include sulfobetaine-type amphoteric surfactants such as 20HD (lauryl hydroxysulfobetaine, manufactured by Kao Corporation) and softazoline LSB (lauramidopropyl hydroxysultaine, manufactured by Kawaken Fine Chemicals Co., Ltd.); and imidazoline-type amphoteric surfactants such as NIKKOL AM-101 (2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, manufactured by Nikko Chemicals Co., Ltd.) and Nissan Anon GLM-R-LV (2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, manufactured by NOF Corporation).

[0043] In addition to those mentioned above, alkylamine oxide compounds can also be used as the aforementioned amphoteric surfactant.

[0044] The alkylamine oxide compound is not particularly limited and can be appropriately selected depending on the purpose. Examples include alkyldimethylamine oxide and dihydroxyethyl laurylamine oxide.

[0045] Examples of the alkyldimethylamine oxides include lauryldimethylamine oxide, myristyldimethylamine oxide, coconut alkyldimethylamine oxide, and oleyldimethylamine oxide. These may be used individually or in combination of two or more types.

[0046] <<<Nonionic surfactant>>> The nonionic surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include polyoxyethylene alkyl ethers other than component (B), polyoxyethylene alkylphenyl ethers, polyoxyethylene fatty acid esters, polyoxyethylene sorbitan fatty acid esters, glycerin fatty acid esters, sorbitan fatty acid esters, polyglycerin fatty acid esters, sucrose fatty acid esters, alkyl polyglycosides, polyoxyethylene polyoxypropylene glycol, and polyoxyethylene hydrogenated castor oil.

[0047] <<Oil-based ingredients>> There are no particular restrictions on the oils used, and they can be appropriately selected according to the purpose. Examples include vegetable oils and fats such as castor oil, olive oil, cocoa oil, hydrogenated palm oil, camellia oil, coconut oil, wood wax, jojoba oil, grapeseed oil, and avocado oil, and their ester compounds; animal oils and fats such as mink oil and egg yolk oil; waxes such as beeswax, whale wax, lanolin, hydrogenated lanolin, carnauba wax, and candelilla wax; hydrocarbons such as liquid paraffin, squalane, microcrystalline wax, ceresin wax, paraffin wax, and petrolatum; natural and synthetic fatty acids such as oleic acid, isostearic acid, and behenic acid; and esters such as glycerol tri-2-ethylhexanoate, 2-ethylhexyl stearate, butyl stearate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, octyldodecyl oleate, and cholesterol oleate. These can be used individually or in combination of two or more.

[0048] <<High-grade alcohol>> There are no particular restrictions on the alcohols mentioned above, and they can be appropriately selected depending on the purpose. Examples include natural and synthetic higher alcohols such as cetyl alcohol, oleyl alcohol, stearyl alcohol, hexyldecanol, octyldodecanol, and lauryl alcohol. These can be used individually or in combination of two or more.

[0049] <<Moisturizer>> The aforementioned humectant is not particularly limited and can be appropriately selected depending on the purpose. Examples include 1,2-pentanediol, diethylene glycol, diethylene glycol monoalkyl ether, polypropylene glycol, polypropylene glycol, hydrogenated castor oil (30 E.O.), diglycerin, triglycerin, and polyglycerin. These can be used individually or in combination of two or more.

[0050] <<Preservatives>> There are no particular restrictions on the preservatives mentioned above, and they can be appropriately selected depending on the purpose. Examples include benzoates, sorbates, dehydroacetates, parahydroxybenzoates, 2,4,4'-trichloro-2'-hydroxydiphenyl ether, 3,4,4'-trichlorocarbanilide, benzalkonium chloride, hinokitiol, resorcinol, methylchloroisothiazolinone / methylisothiazolinone solution (product name: Kayson CG, manufactured by Rohm & Haas Japan), salicylic acid, pentanediol, phenoxyethanol, and ethanol. These can be used individually or in combination of two or more.

[0051] <<Chelating agent>> The chelating agent is not particularly limited and can be appropriately selected depending on the purpose. Examples include disodium edetate, ethylenediaminetetraacetate, hexametaphosphate, and gluconic acid. These may be used alone as one kind, or two or more kinds may be used in combination.

[0052] <<pH adjuster>> The pH adjuster is not particularly limited and may be appropriately selected depending on the purpose, and examples thereof include sodium hydroxide, potassium hydroxide, citric acid, succinic acid, triethanolamine, aqueous ammonia, triisopropanolamine, phosphoric acid, and glycolic acid. These may be used alone as one kind, or two or more kinds may be used in combination.

[0053] <<Vitamins>> The vitamins are not particularly limited and may be appropriately selected depending on the purpose, and examples thereof include vitamin A, vitamin B group, vitamin C, vitamin D, vitamin E, vitamin F, vitamin K, vitamin P, vitamin U, carnitine, ferulic acid, γ-oryzanol, α-lipoic acid, orotic acid and derivatives thereof. These may be used alone as one kind, or two or more kinds may be used in combination.

[0054] <<Perfume>> The perfume is not particularly limited and may be appropriately selected depending on the purpose. For example, perfume compositions A to D described in paragraphs

[0065] to

[0071] of Japanese Patent Application Laid-Open No. 2002-128658, perfume compositions A to E described in paragraphs

[0076] to

[0088] of Japanese Patent Application Laid-Open No. 2003-73249, or blended perfume compositions 1 to 4 described in paragraphs

[0016] to

[0023] of Japanese Patent Application Laid-Open No. 2020-132680 can be used.

[0055] pH The pH (at 25°C) of the hair cosmetic composition of the present embodiment is not particularly limited and may be appropriately selected depending on the purpose. From the viewpoint of stability, it is preferably 2 or more and 8 or less, and more preferably 3 or more and 6 or less. The pH can be measured in accordance with the pH measurement method, which is a general test method of the Japanese Standards for Quasi-drug Ingredients (Outer Ingredient Standards).

[0056] The pH of the aforementioned hair cosmetic composition can be adjusted by adding a pH adjuster such as citric acid after mixing all the components, while checking the pH. More specifically, the components other than the pH adjuster such as citric acid are mixed and stirred with purified water as a balance so that the total amount of these components is approximately 98% by mass. Heating may be added if necessary. While mixing and stirring, an aqueous solution of the pH adjuster such as citric acid is gradually added, and the pH of each component is measured as it is added until the target pH is reached. Once the target pH is reached, the remaining purified water is added last to bring the total amount of water to 100% by mass.

[0057] [viscosity] The viscosity (at 25°C) of the hair cosmetic composition of this embodiment is not particularly limited and can be appropriately selected depending on the purpose, but from the viewpoint of usability, it is preferably 10 mPs·s to 1,500 mPa·s and more preferably 200 mPs·s to 1,200 mPs·s. Viscosity can be measured at 25°C in accordance with Method 2 of the General Test Method for Viscosity Measurement in the External Standards for Standardization of Viscosity.

[0058] <Method for producing hair cosmetic composition> There are no particular limitations on the method for producing the hair cosmetic composition, and it can be appropriately selected depending on the purpose. For example, it can be prepared by mixing component (A), component (B), and the other components. Specifically, the water-soluble components including the other components can be mixed and dissolved in a 70°C water bath to form an aqueous phase, component (A) and component (B) can be uniformly mixed into this aqueous phase, and then the mixture can be cooled to room temperature while stirring to obtain the hair cosmetic composition.

[0059] There are no particular limitations on the apparatus for preparing the hair cosmetic composition, and an appropriate apparatus can be selected depending on the purpose. For example, an agitator equipped with multiple stirring blades (propellers, turbines, dispersers, etc.) capable of shearing and overall mixing can be used.

[0060] [Application] The hair cosmetic composition of this embodiment is suitably used as a hair treatment agent, such as a hair serum, hair rinse, hair conditioner, hair treatment, hair pack, or hair spray. The hair cosmetic composition of this embodiment may be a rinse-off type or a leave-in type, but it is preferably a rinse-off type. [Examples]

[0061] The embodiment will be described in more detail below based on examples and comparative examples, but the embodiment is not limited to these examples. Furthermore, the content of each component described in the examples and comparative examples is shown in "mass%", and all values ​​are calculated on a pure content basis.

[0062] (Examples 1-19 and Comparative Examples 1-8) Hair cosmetic compositions with the compositions and contents shown in Tables 1 to 5 below were prepared by the following method. Specifically, components (A) and (B) were uniformly mixed in 70°C water, then cooled to room temperature while stirring, and the fragrance was added. The pH was 4.0 to 4.8. The mixing of each component was carried out by using a propeller as an agitator and stirring with a Three One Motor (HEIDON BL1200, manufactured by Shinto Chemical Co., Ltd.).

[0063] For each hair cosmetic composition obtained, the following effects were evaluated: "effect on improving the tensile strength of hair after drying," "softness of hair after drying," and "effect on suppressing hair frizz in a high-humidity environment."

[0064] [Method for evaluating the effect of improving the tensile strength of hair after drying] Ten strands of hair were selected from a 30cm hair bundle (10g) dyed with commercially available bleach. The maximum load (N) at which the hair broke was measured using a tensile testing machine (INSTRON), and the cross-sectional area (mm²) of the measured hair was then measured. 2 Divide by ) to obtain the tensile strength (N / mm²). 2The tensile strength (N / mm²) was calculated and used as the initial value. 1g of the sample was applied to the same hair bundle, combed 60 times, rinsed for 20 seconds, lightly squeezed out excess water, and air-dried at 25°C and 40% RH. The tensile strength (N / mm²) of the treated hair after drying was similarly calculated. 2 The tensile strength of the hair after drying was calculated and evaluated with the initial value set to 100%. The sample size was 10, and the average value of these samples was used as the measured value. The tensile strength of the hair after drying was evaluated based on the following criteria. -Judgment criteria- ◎: Tensile strength is 120% or more compared to the initial value. ○: Tensile strength is 110% or more but less than 120% of the initial value. △: Tensile strength is 100% or more but less than 110% of the initial value. ×: Tensile strength is less than 100% of the initial value.

[0065] [Method for evaluating the softness of hair after drying] A 30cm strand (10g) of hair dyed with a commercially available bleach was treated with 1g of the sample, combed 60 times, rinsed for 20 seconds, lightly squeezed to remove excess water, and air-dried at 25°C and 40% RH. Three expert panelists evaluated the softness of the dried hair based on the following criteria. -Judgment criteria- ◎: The softness of the hair after drying is significantly better than that of the untreated sample. ○: The softness of the hair after drying is better than that of the untreated sample. △: The softness of the hair after drying is slightly better than that of the untreated sample. ×: The softness of the hair after drying is equivalent to that of the untreated sample hair.

[0066] [Effect of suppressing hair frizz in high humidity environments] A 30cm hair bundle (10g) dyed with a commercially available bleach was washed with 1g of 27% AES (polyoxyethylene alkyl ether sulfate), air-dried at 25°C and 40% RH, combed three times, and the hair bundle width at 25cm from the root was measured to obtain the initial value. 1g of each hair cosmetic composition was applied to the same hair bundle, combed 60 times, rinsed for 20 seconds, lightly squeezed dry, and dried by running fingers through the hair once every 2 seconds while applying a hairdryer from a distance of 20cm. After drying, the hair bundle was left to stand at 20°C and 80% RH for 2 hours, combed three times, and the hair bundle width at 25cm from the root was measured. Note that there were 3 samples, and the average value was used as the measurement value. The effect of suppressing hair frizz in a high-humidity environment was evaluated based on the following criteria. -Judgment criteria- ◎: Hair bundle width is less than 90% of the initial value ○: Hair bundle width is 90% or more but less than 95% of the initial value. △: Hair bundle width is 95% or more but less than 100% of the initial value. ×: Hair bundle width is 100% or more of the initial value

[0067] [Table 1]

[0068] [Table 2]

[0069] [Table 3]

[0070] [Table 4]

[0071] [Table 5]

[0072] Hair cosmetic compositions for formulations 1 to 9 were prepared using the same method as in Example 1.

[0073] [Table 6]

[0074] [Table 7]

[0075] Details of each component used in Examples 1-19, Comparative Examples 1-8, and Formulation Examples 1-9 are shown in Tables 8-9 below.

[0076] [Table 8]

[0077] [Table 9] [Industrial applicability]

[0078] The hair cosmetic composition of this embodiment is excellent in terms of tensile strength and softness of hair after drying, and also excellent in suppressing hair frizz in high humidity environments. Therefore, it can be suitably used in hair treatment agents such as hair serums, hair rinses, hair conditioners, hair treatments, hair packs, and hair sprays.

Claims

1. (A) Isoprene glycol and (B) One or more selected from polyoxyethylene phytosterols having an average number of moles of ethylene oxide added of 10 or more and 40 or less, and branched polyoxyethylene alkyl ethers having 14 or more carbon atoms in the alkyl group and an average number of moles of ethylene oxide added of 10 or more and 40 or less, A hair cosmetic composition containing, The content of component (A) is 21% by mass or more and 60% by mass or less based on the total amount of the hair cosmetic composition. A hair cosmetic composition characterized in that the mass ratio of the content of component (A) to the content of component (B) [(A) / (B)] is 1.5 or more and 40 or less.

2. The content of component (A) is 30% by mass or more and 50% by mass or less based on the total amount of the hair cosmetic composition. The hair cosmetic composition according to claim 1, wherein the content of component (B) is 3% by mass or more and 10% by mass or less based on the total amount of the hair cosmetic composition.

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