Hair cosmetics

Abstract

To provide a hair cosmetic that has thick, rich and moist feeling when applied under a high-temperature condition, satisfactory permeation into hair under a low-temperature condition, excellent non-stickiness of scalp after packing for a long time and rinsing.SOLUTION: A hair cosmetic contains: (a) monohydric alcohol having a hydrocarbon group having a carbon number which is an even number of 16 to 22 by 1 to 20 mass%; (b) monohydric alcohol having a hydrocarbon group having a carbon number which is an odd number of 15 to 23 by 0.0005 to 0.1 mass%; (c) cationic surfactant having an alkyl group having a carbon number of 18 to 22 by 0.5 to 10 mass%; and (d) polyethylene glycol monostearate by 0.1 to 2 mass%.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a hair cosmetic that has thickness and richness when applied under high temperature conditions, blends well with hair under low temperature conditions, can be left on for a long time, and leaves the scalp feeling non-greasy after rinsing. [Background technology]

[0002] Hair is damaged daily by factors such as exposure to ultraviolet rays, chemicals in the air, heat from hair dryers and irons, friction from shampooing and brushing, and stress in daily life, resulting in poor manageability and loss of shine. Therefore, hair cosmetics such as hair conditioners and hair treatments are used to provide conditioning effects such as improved manageability, shine, and moisture, thereby maintaining healthy hair.

[0003] The functions required of hair cosmetics are diverse, and while the finishing effect that is imparted to the hair as mentioned above is important, the feel during application, such as how well it blends into the hair and the thickness and richness that allows it to cling to the hair, is also important in order to apply the hair cosmetic evenly to the ends of the hair. In addition, the absence of stickiness after rinsing is also important for stress-free use (Patent Document 1: Japanese Unexamined Patent Publication No. 2009-084172 and Patent Document 2: Japanese Unexamined Patent Publication No. 2012-097047).

[0004] Furthermore, hair cosmetics are expected to be stored and used under various environmental conditions. For example, when using the drying function of a bathroom heater / dryer, which has become widespread in recent years, the bathroom temperature rises to an average of 40-45°C, and hair cosmetics stored in the bathroom also become hot. In such cases, the hair cosmetics may be used before they return to room temperature. Although hair cosmetics with excellent high-temperature stability have been developed, as mentioned above, if used at high temperatures without returning to room temperature, the thickness and richness of the hair cosmetics may be insufficient. On the other hand, bathrooms in winter can be as cold as 10°C or below. And, similarly, hair cosmetics may be used before they return to room temperature. Hair cosmetics with excellent low-temperature stability have been developed (Patent Document 3: JP 2019-172584). [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2009-084172 [Patent Document 2] Japanese Patent Publication No. 2012-097047 [Patent Document 3] Japanese Patent Publication No. 2019-172584 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] However, even hair cosmetics with excellent low-temperature stability sometimes exhibited insufficient absorption into the hair when used at low temperatures without being allowed to return to room temperature. Furthermore, a hair cosmetic that excelled in both thickness and richness at high temperatures and absorption at low temperatures had not yet been developed.

[0007] Furthermore, consumers concerned about hair damage sometimes leave hair care products on for longer than usual before rinsing, but this can sometimes result in stickiness. In addition, hair care products that offer excellent thickness and richness, as described above, have the problem of making the scalp even stickier after rinsing if left on for a certain amount of time before rinsing.

[0008] The object of the present invention is to provide a hair cosmetic that has thickness and richness when applied under high temperature conditions, blends well with hair under low temperature conditions, can be left on for a long time, and leaves the scalp feeling non-greasy after rinsing. [Means for solving the problem]

[0009] The inventors of the present invention have found that the above problems can be solved by blending the components (a) to (d) described below in specific proportions, and have completed the present invention. In other words, the present invention is as follows: (a) The number of carbon atoms is an even number between 16 and 22. saturation A monohydric alcohol having a hydrocarbon group in an amount of 1 to 20% by mass, (b) The number of carbon atoms is an odd number between 15 and 23. saturation A monohydric alcohol having a hydrocarbon group is added in a concentration of 0.0005 to 0.1% by mass. (c) 0.5 to 10% by mass of a cationic surfactant having an alkyl group with 18 to 22 carbon atoms, and (d) 0.1-2% by mass of polyethylene glycol monostearate A hair cosmetic characterized by containing [a certain ingredient]. [Effects of the Invention]

[0010] The hair cosmetic of the present invention is superior in that it has a thick, rich texture when applied under high temperature conditions, blends well with the hair under low temperature conditions, can be left on for a long time, and leaves the scalp feeling non-greasy after rinsing. [Modes for carrying out the invention]

[0011] Hereinafter, embodiments of the present invention will be described. The hair cosmetic of the present invention contains the following components (a), (b), (c), and (d). Hereinafter, each component will be described.

[0012] [(a) component] The (a) component used in the present invention is a monohydric alcohol having a hydrocarbon group with an even number of carbon atoms from 16 to 22. Such monohydric alcohols are solid and have no fluidity at 25°C. The hydrocarbon group with an even number of carbon atoms from 16 to 22 may be a straight-chain or branched-chain hydrocarbon group, and may also be a saturated or unsaturated hydrocarbon group. Particularly preferably, component (a) is a monohydric alcohol having a straight-chain saturated hydrocarbon group without branches or unsaturated bonds.

[0013] Specific examples of component (a) include, for example, cetyl alcohol, stearyl alcohol, behenyl alcohol, and the like. Also, as component (a), one selected from the above monohydric alcohols can be used alone or in combination of two or more. Particularly, from the viewpoint of achieving both the thickness and richness during application under high-temperature conditions and the adaptability to hair under low-temperature conditions, it is preferable to use a combination of two or more selected from the above monohydric alcohols, and a combination of cetyl alcohol, stearyl alcohol, and behenyl alcohol is particularly preferable.

[0014] In the present invention, the content of component (a) is from 1 to 20% by mass, preferably from 2 to 15% by mass, and more preferably from 3 to 10% by mass, based on the total amount of the hair cosmetic. When the content of component (a) is less than 1% by mass, the thickness and richness during application under high-temperature conditions become insufficient. When the content of component (a) exceeds 20% by mass, the adaptability to hair under low-temperature conditions, the lack of stickiness of the scalp after long-term packing and rinsing become insufficient.

[0015] [(b) component] Component (b) used in the present invention is a monohydric alcohol having an odd number of carbon atoms of 15 to 23. Such monohydric alcohols are solids that do not have fluidity at 25°C. The hydrocarbon group having an odd number of carbon atoms of 15 to 23 may be a linear or branched hydrocarbon group, and may also be a saturated or unsaturated hydrocarbon group. Particularly preferably, component (a) is preferably a monohydric alcohol having a linear saturated hydrocarbon group without branches or unsaturated bonds.

[0016] Specific examples of component (b) include, for example, pentadecanol, heptadecanol, tricosanol, etc. As component (b), one selected from the above monohydric alcohols can be used alone, or two or more can be used in combination. Particularly from the viewpoints of compatibility with hair under low-temperature conditions, long-term packing, and lack of stickiness of the scalp after rinsing, it is preferable to use two or more selected from the above monohydric alcohols in combination, and a combination of two or three selected from pentadecanol, heptadecanol, and tricosanol is particularly preferable.

[0017] In the present invention, the content of component (b) is 0.0005 to 0.1% by mass based on the total amount of the hair cosmetic, preferably 0.001 to 0.08% by mass, and more preferably 0.005 to 0.05% by mass. When the content of component (b) is less than 0.0005% by mass, the compatibility with hair under low-temperature conditions, long-term packing, and lack of stickiness of the scalp after rinsing become insufficient. When the content of component (b) exceeds 0.1% by mass, the effect commensurate with the blending amount may not be seen, and it may be economically disadvantageous.

[0018] [(c) component] Component (c) used in the present invention is a cationic surfactant having an alkyl group with 18 to 22 carbon atoms. For example, a surfactant represented by the following general formula (1) is preferable

[0019]

Chemical formula

[0020] 〔In formula (1), R 2 , 4 , 3 represents an alkyl group having 18 to 22 carbon atoms, R 2 represents an alkyl group having 18 to 22 carbon atoms or an alkyl group having 1 to 3 carbon atoms which may be substituted by a hydroxy group, R 3 and R 4 each independently represent an alkyl group having 1 to 3 carbon atoms which may be substituted by a hydroxy group, and X - represents an anion.〕

[0021] The alkyl group having 18 to 22 carbon atoms in the above R 1 and R 2 is preferably a linear alkyl group, and specific examples thereof include a stearyl group, a behenyl group and the like. Specific examples of the alkyl group having 1 to 3 carbon atoms which may be substituted by a hydroxy group in the above R 2 , R 3 , R 4 include a methyl group, an ethyl group, a propyl group, a hydroxymethyl group, a hydroxyethyl group and the like.

[0022] Alternatively, component (c) is preferably a tertiary amide amine type surfactant represented by general formula (2) which is usually used in the form of a salt by being neutralized by the addition of an acid. [Chemical formula]

[0023] 〔In formula (2), R​​​​​​​​​​​​- Examples include halide ions such as chloride ions and bromide ions; C1-C3 alkyl sulfate ions such as methosulfate ions and ethosulfate ions; C1-C3 alkyl phosphate ions such as methophosphate ions and ethophosphate ions; C1-C3 alkyl carbonate ions such as methocarbonate ions; acylate ions such as acetate ions, citrate ions, lactate ions, and glycolate ions; nitrate ions; and sulfate ions. Among these, chloride ions, bromide ions, methosulfate ions, ethosulfate ions, methophosphate ions, ethophosphate ions, or methocarbonate ions are preferred, and chloride ions or bromide ions are more preferred.

[0025] Examples of surfactants represented by general formula (1) or general formula (2) include stearyltrimethylammonium chloride, behenyltrimethylammonium chloride, stearyltrimethylammonium bromide, behenyltrimethylammonium bromide, distearyldimethylammonium chloride, stearamidopropyldimethylamine, behenamidopropyldimethylamine, stearamidoethyldiethylamine, and behenamidoethyldiethylamine. Among these, stearyltrimethylammonium chloride and behenyltrimethylammonium chloride are preferred in terms of thickness when applied. The cationic surfactant represented by the above general formula (1) or general formula (2) can be manufactured by known methods. Alternatively, commercially available products may be used.

[0026] (c) Component can be used alone or in combination of two or more types. In the present invention, the content of component (c) is 0.5 to 10% by mass, preferably 0.7 to 5% by mass, and more preferably 1 to 4% by mass, based on the total amount of hair cosmetic. If the content of component (c) is less than 0.5% by mass, the thickness and richness when applied under high temperature conditions, and the lack of stickiness on the scalp after rinsing after prolonged packing may be insufficient. If the content of component (c) exceeds 10% by mass, the absorption into the hair under low temperature conditions, and the lack of stickiness on the scalp after rinsing after prolonged packing may be insufficient.

[0027] [(d) component] The component (d) used in the present invention is polyethylene glycol monostearate, and the number of moles of ethylene oxide added to polyethylene glycol stearate is preferably 5 to 40. Specifically, examples include PEG-5 stearate (5 moles added), PEG-30 stearate (30 moles added), PEG-40 stearate (40 moles added), etc.

[0028] In the present invention, the content of component (d) is 0.1 to 2% by mass, preferably 0.2 to 1.5% by mass, and more preferably 0.4 to 1% by mass, based on the total amount of cosmetic. If the content of component (d) is less than 0.1% by mass, the thickness and richness when applied under high temperature conditions, and the lack of stickiness on the scalp after rinsing after prolonged packing, will be insufficient. If the content of component (d) exceeds 2% by mass, the absorption into the hair will be insufficient under low temperature conditions.

[0029] The hair cosmetic composition of the present invention may contain other components other than those listed above (a) to (d), as long as they do not impair the effects of the present invention. These other components are commonly used in cosmetics and include, for example, higher fatty acids and their triglycerides, ester oils, animal and vegetable oils and fats, vitamins, metal ion chelating agents, thickeners, dyes, pigments, fragrances, etc. As solvents, water, ethanol, 1,3-butylene glycol, dipropylene glycol, propylene glycol, glycerin, etc., can be used.

[0030] Examples of ester oils include ester oils with a total of 8 to 40 carbon atoms, preferably esters of fatty acids with a total of 8 to 20 carbon atoms and alcohols with 1 to 20 carbon atoms, with isopropyl palmitate and isopropyl myristate being preferred. Examples of animal and vegetable oils include horse oil, peony oil, deer fat, olive oil, camellia oil, shea butter, almond oil, safflower oil, sunflower oil, soybean oil, cottonseed oil, sesame oil, corn oil, rapeseed oil, rice bran oil, rice germ oil, grape seed oil, avocado oil, macadamia nut oil, castor oil, coconut oil, evening primrose oil, and cocoa butter.

[0031] Examples of vitamins include vitamin A or its derivatives, vitamin B6 hydrochloride, vitamin B6 tripalmitate, vitamin B6 dioctanoate, vitamin B2 or its derivatives, vitamin B12, vitamin B15 or its derivatives, vitamin E derivatives such as α-tocopherol, β-tocopherol, γ-tocopherol, and vitamin E acetate, vitamin D derivatives, vitamin H, pantothenic acid, pantethine, and pyrroloquinoline quinone. Examples of metal ion chelating agents include ethylenediaminetetraacetic acid (EDTA) and its salts, hydroxyethylethylenediaminetriacetic acid (HEDTA) and its salts, diethylenetriaminepentaacetic acid and its salts, and hydroxyethanediphosphonic acid (HEDP) and its salts.

[0032] Examples of thickening agents include guar gum, quince seed, carrageenan, galactan, gum arabic, pectin, mannan, starch, xanthan gum, curdlan, methylcellulose, hydroxyethylcellulose, carboxymethylcellulose, methylhydroxypropylcellulose, chondroitin sulfate, dermatan sulfate, glycogen, heparan sulfate, hyaluronic acid, sodium hyaluronate, tragacanth gum, keratan sulfate, chondroitin, mucoitin sulfate, hydroxyethyl guar gum, carboxymethyl guar gum, dextran, locust bean gum, succinoglucan, carotenic acid, chitin, chitosan, carboxymethyl chitin, agar, polyvinyl alcohol, polyvinylpyrrolidone, carboxyvinyl polymer, sodium polyacrylate, polyethylene glycol, and bentonite.

[0033] The hair cosmetic composition of the present invention preferably has a pH of 4 to 7. In this case, a higher effect can be obtained, and the composition can also have excellent stability over time.

[0034] The hair cosmetic composition of the present invention can be used in hair conditioners, hair treatments, hair rinses, hair packs, hair milks, hair creams, etc., and each can be manufactured according to conventional methods. [Examples]

[0035] The present invention will be described in more detail below with reference to examples and comparative examples. [Examples 1-12, Comparative Examples 1-3] Each of the hair cosmetic compositions in Examples 1-12 and Comparative Examples 1-3 was prepared by blending each component in the parts by mass shown in Tables 1-3. The values ​​in Tables 1-3 are in mass percent. The "common additives" listed in Tables 1-3 are shown in Table 4. Each hair cosmetic product was evaluated using the following evaluation method.

[0036] <Evaluation Method> (1) Evaluation of thickness and richness when applied under high temperature conditions Twenty women (ages 22-40) participated as panelists. After washing their hair, they applied 5g of each hair conditioner, taken from a 40°C constant temperature bath, to their wet hair. They evaluated the thickness of the conditioner applied to the hair as follows and assigned scores. Based on the total scores, they were evaluated on a four-point scale from "◎" to "×," with products scoring 30 points or higher being judged as hair cosmetics with superior thickness and richness upon application. 2. When you feel that the thickness applied to the hair is sufficient. 1 point: If you feel that the thickness applied to the hair is slightly insufficient. 0 points: If you felt that the thickness applied to the hair was insufficient. <5-point rating based on total score> ◎: Total score of 35 points or higher ○: Total score of 30 points or more, and 34 points or less. △: Total score is between 20 and 29 points. ×: Total score of 19 points or less

[0037] (2) Evaluation of compatibility with hair under low temperature conditions Twenty women (ages 22-40) participated as panelists. After washing their hair, they applied 5g of each hair conditioner, taken from a 5°C constant temperature bath, to their wet hair and evaluated the feel of the conditioner as described below, assigning a score. Based on the total score, they were evaluated on a four-point scale from "◎" to "×," with products scoring 30 points or higher being judged as hair cosmetics with excellent hair absorption. 2. If you find it blends easily with your hair. 1 point: If you find it slightly difficult to blend into your hair. 0 points: If you found it difficult to blend with your hair. <5-point rating based on total score> ◎: Total score of 35 points or higher ○: Total score of 30 points or more, and 34 points or less. △: Total score is between 20 and 29 points. ×: Total score of 19 points or less

[0038] (3) No greasiness on the scalp after leaving the pack on for a long time and rinsing. Twenty women (ages 22-40) participated as panelists. After washing their hair, they applied 5g of each hair conditioner to their wet hair, left it on for 30 minutes, rinsed it off, and then dried their hair with a hairdryer. They evaluated the feel of the conditioner and assigned scores as follows. Based on the total scores, they were evaluated on a four-point scale from "◎" to "×," with products scoring 30 points or higher being judged as hair cosmetics with excellent compatibility with hair. 2. If you feel your scalp is not greasy. 1. If you feel your scalp is slightly greasy. 0 points: If you feel your scalp is greasy. The total scores of the 20 participants were calculated and judged as follows. <5-point rating based on total score> ◎: Total score of 35 points or higher ○: Total score of 30 points or more, and 34 points or less. △: Total score is between 20 and 29 points. ×: Total score of 19 points or less

[0039] [Table 1]

[0040] [Table 2]

[0041] [Table 3]

[0042] The following ingredients were used as shown in the table. [Ingredient (A)] • Cetanol (1-hexadecanol, a linear saturated alcohol with 16 carbon atoms): Reagent grade (manufactured by Tokyo Chemical Industry Co., Ltd.) • Stearyl alcohol (1-octadecanol, a linear saturated alcohol with 18 carbon atoms): Reagent grade (manufactured by Tokyo Chemical Industry Co., Ltd.) • Behenyl alcohol (1-docosanol, a linear saturated alcohol with 22 carbon atoms): Reagent grade (manufactured by Tokyo Chemical Industry Co., Ltd.) [Component (B)] • Pentadecanol (1-pentadecanol, a linear saturated alcohol with 15 carbon atoms): Reagent grade (manufactured by Tokyo Chemical Industry Co., Ltd.) • Heptadecanol (1-heptadecanol, a linear saturated alcohol with 17 carbon atoms): Reagent grade (manufactured by Tokyo Chemical Industry Co., Ltd.) • Tricosanol (1-tricosanol, a linear saturated alcohol with 23 carbon atoms): Reagent grade (manufactured by Tokyo Chemical Industry Co., Ltd.)

[0043] [Table 4]

[0044] As shown in Tables 1 and 2, each of the hair cosmetic products in Examples 1 to 12 was evaluated as a hair cosmetic product that excels in thickness and richness when applied under high temperature conditions, blendability with hair under low temperature conditions, and the absence of stickiness on the scalp after rinsing and prolonged pack application. In particular, the hair cosmetic composition of Example 3, which contains (a) cetanol, stearyl alcohol, and behenyl alcohol in combination, totaling 3% by mass; (b) pentadecanol and tricosanol in combination, totaling 0.01% by mass; (c) 1% by mass; and (d) 0.8% by mass, received very good evaluations in all evaluation items.

[0045] On the other hand, as shown in Table 3, none of the hair cosmetic products in Comparative Examples 1 to 3 demonstrated sufficient effectiveness in any of the evaluation items, as follows. For example, Comparative Example 1, which did not contain ingredient (a), was evaluated as having insufficient thickness and richness when applied under high-temperature conditions. Furthermore, Comparative Example 2, which did not contain ingredient (b), was evaluated as having insufficient absorption into the hair under low-temperature conditions, and lacking stickiness on the scalp after prolonged use and rinsing. (d) The hair cosmetic of Comparative Example 3, which did not contain ingredient (d), was evaluated as having insufficient thickness and richness when applied under high temperature conditions, and lack of stickiness on the scalp after being left on for a long time and rinsing. [Industrial applicability]

[0046] As described in detail above, the present invention provides a hair cosmetic that has thickness and richness when applied under high temperature conditions, blends well with hair under low temperature conditions, can be left on for a long time, and leaves the scalp feeling non-greasy after rinsing.

Claims

[Claim 1] (a) 1 to 20% by mass of a monohydric alcohol having a saturated hydrocarbon group with an even number of carbon atoms, (b) 0.0005 to 0.1% by mass of a monohydric alcohol having a saturated hydrocarbon group with an odd number of carbon atoms, (c) 0.5 to 10% by mass of a cationic surfactant having an alkyl group with 18 to 22 carbon atoms, and (d) 0.1 to 2% by mass of polyethylene glycol monostearate A hair cosmetic characterized by containing [a certain ingredient].

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