Hair cosmetic

Abstract

To provide a hair cosmetic that exhibits favorable applicability, improved finger combability upon rinsing, and stable emulsification.SOLUTION: A hair cosmetic applied to hair whose pH becomes 8 or more after treatment with a permanent-wave agent contains (A) at least one selected from citric acid, glycolic acid, and levulinic acid, (B) a higher alcohol having an alkyl chain of 14-22 carbon atoms, and (C) at least one selected from stearyltrimethylammonium chloride and behenyltrimethylammonium chloride, wherein a content of the component (A) is 1-5 mass% and a viscosity at 20°C is 20,000-60,000 mPa s.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a hair cosmetic composition that has good application properties, finger-combability when rinsed off, and emulsion stability. [Background technology]

[0002] In modern times, perm agents are widely used as a method for permanent waving and hair straightening. Perm agents that are widely used include a first agent containing an alkaline agent and a reducing agent, and a second agent containing an oxidizing agent. The alkaline agent contained in the first agent of such perm agents raises the pH inside the hair, opening the cuticle on the surface of the hair and allowing the reducing agent to penetrate into the hair.

[0003] However, the alkaline agent contained in the first agent of a perm solution raises the pH of the hair and opens the cuticle on the surface of the hair, damaging the surface and inner surface of the hair. The alkaline agent contained in the first agent of a perm solution often remains in the hair even after treatment with the second agent, which contains an oxidizing agent. This further damages the surface and inner surface of the hair after perming, making it difficult to run your fingers through. To care for this type of hair, hair cosmetics that can tighten the cuticle after perming are commonly used (Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-119143 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in conventional techniques, the function of lowering the pH in hair after treatment with a perm agent has not been fully investigated, and damage reduction is still insufficient. As a result, the hair cuticle is left open, making it difficult to run your fingers through when rinsing, leaving room for improvement. Furthermore, when a hair cosmetic contains a large amount of acidic substances in order to lower the pH in hair that has increased after treatment with a perm agent, the emulsion stability of the hair cosmetic cannot be maintained, and separation of the hair cosmetic or water spillage may occur. Furthermore, the alkaline agent contained in the first agent of the perm agent opens and damages the cuticle, causing internal substances to leak out and increasing water absorption. Therefore, even if a hair cosmetic intended to reduce damage is applied, this high water absorption makes it difficult to apply evenly and without unevenness. As a result, it is difficult for the hair cosmetic to fully exert its function. As a result, the function of lowering the pH in hair after treatment with a perm agent is insufficient, and damage reduction may still be insufficient.

[0006] Specifically, the object of the present invention is to provide a hair cosmetic composition and its use that lowers the pH of hair that has reached 8 or higher after treatment with a perm agent, thereby improving the combability of the hair when rinsed off. Another object of the present invention is to provide a hair cosmetic composition that has good emulsion stability and easy application. [Means for solving the problem]

[0007] As a result of extensive research into solving the above problems, the present inventors have discovered a hair cosmetic composition to be applied to hair whose pH has reached 8 or higher after treatment with a perm agent, which comprises: (A) one or more selected from citric acid, glycolic acid, and levulinic acid; (B) a higher alcohol having an alkyl chain containing 14 to 22 carbon atoms; (C) one or more selected from stearyltrimethylammonium chloride and behenyltrimethylammonium chloride Contains The content of the component (A) is 1 to 5 mass %, The present inventors have found that a hair cosmetic having a viscosity of 20,000 to 60,000 mPa·s at 20°C can solve the above problems, and have completed the present invention. [Effects of the Invention]

[0008] The present invention provides a hair cosmetic that has good application properties, finger-combability when rinsed off, and emulsion stability. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention will be described in detail below. Note that the units indicating the contents are all % by mass unless otherwise specified.

[0010] The present invention provides a hair cosmetic composition to be applied to hair whose pH has reached 8 or more after treatment with a perm agent, comprising: (A) one or more selected from citric acid, glycolic acid, and levulinic acid; (B) a higher alcohol having an alkyl chain containing 14 to 22 carbon atoms; (C) one or more selected from stearyltrimethylammonium chloride and behenyltrimethylammonium chloride Contains The content of the component (A) is 1 to 5%, The hair cosmetic is characterized by having a viscosity at 20°C of 20,000 to 60,000 mPa·s.

[0011] The hair cosmetic composition of the present invention has a viscosity of 20,000 to 60,000 mPa·s at 20°C, which allows it to be applied evenly to the hair and has good hold so that it does not drip off the hair.Since the composition is firmly held on the hair, the pH in the hair can be further reduced.

[0012] The hair cosmetic composition of the present invention lowers the pH in hair that has reached 8 or higher after treatment with a perm agent, thereby smoothing the open cuticles on the hair surface and making the hair easier to run your fingers through when rinsing.

[0013] The hair cosmetic composition of the present invention will now be described.

[0014] The hair cosmetic composition of the present invention contains (A) one or more acids selected from citric acid, glycolic acid, and levulinic acid, from the viewpoint of smoothness of running fingers through the hair when rinsing.

[0015] The component (A) used in the hair cosmetic composition of the present invention is preferably citric acid, from the viewpoint of improving the ease of running fingers through the hair when rinsing.

[0016] The content of the component (A) used in the hair cosmetic composition of the present invention is 1 to 5%, preferably 1.5 to 5%, and more preferably 2 to 4%. If the component (A) is less than 1%, the hair will not run smoothly through the hair after rinsing. If the component (A) is more than 5%, the emulsion stability will be poor.

[0017] The hair cosmetic composition of the present invention contains (B) a higher alcohol having an alkyl chain with 14 to 22 carbon atoms from the viewpoint of emulsion stability.

[0018] The component (B) used in the hair cosmetic composition of the present invention is not particularly limited, but examples thereof include myristyl alcohol, cetanol, stearyl alcohol, arachyl alcohol, behenyl alcohol, 2-decyltetradecanol, etc., and the hair cosmetic composition may contain one or more of these.

[0019] Of the components (B) used in the hair cosmetic composition of the present invention, cetanol and stearyl alcohol are preferred from the viewpoint of improving emulsion stability.

[0020] The content of component (B) in the hair cosmetic composition of the present invention is not particularly limited, but is preferably 3.5 to 6%, more preferably 5 to 6%. If the content of component (B) is less than 3.5%, emulsion stability may be impaired. If the content of component (B) is more than 6%, the viscosity of the hair cosmetic composition may increase, making it difficult to lower the pH in the hair, and making it difficult to run your fingers through the hair when rinsing.

[0021] The hair cosmetic composition of the present invention contains (C) one or more compounds selected from stearyltrimethylammonium chloride and behenyltrimethylammonium chloride from the viewpoint of emulsion stability.

[0022] The content of the component (C) used in the hair cosmetic composition of the present invention is not particularly limited, but is preferably 0.8 to 4.8%, more preferably 1.6 to 3.2%. If the content of the component (C) is less than 0.8% or more than 4.8%, emulsion stability may be impaired.

[0023] In addition to the essential components, the hair cosmetic of the present invention may contain at least one or more components selected from various components used in ordinary cosmetics, quasi-drugs, pharmaceuticals, etc., such as oily components other than component (B), surfactants other than component (C), water-soluble polymers, moisturizers, chelating agents, protein derivatives, hydrolyzed proteins, stabilizers, antioxidants, plant extracts, vitamins, preservatives, coloring materials, pigments, powders, ultraviolet absorbers, fragrances, etc., within a range that does not impair the effects, although the components are not limited to these examples.

[0024] The viscosity of the hair cosmetic composition of the present invention at 20°C is 20,000 to 60,000 mPa·s. If the viscosity is less than 20,000 mPa·s, emulsion stability will be poor. If the viscosity is more than 60,000 mPa·s, the hair will not easily run its fingers through it when rinsing.

[0025] The viscosity of the hair cosmetic composition of the present invention at 20°C was measured by filling 120 g of the hair cosmetic composition prepared by a conventional method into a 140 g sample bottle (Food 140: manufactured by Daiichi Glass Co., Ltd.), leaving it to stand at 20°C for 1 day to adjust the temperature, and then using a B-type viscometer (model: digital viscometer TVB-10M, manufactured by Toki Sangyo Co., Ltd.) with a No. 4 rotor for 2 minutes at a rotation speed of 3 rpm.

[0026] The pH of the hair cosmetic composition of the present invention at 20°C is not particularly limited, but is preferably 1.5 to 5.

[0027] The pH of the hair cosmetic composition of the present invention at 20°C was measured using a glass electrode hydrogen ion concentration indicator (F-71, manufactured by Horiba, Ltd.) after allowing the hair cosmetic composition prepared by a conventional method to stand at 20°C for one day and adjusting the temperature.

[0028] The hair cosmetic composition of the present invention may be in the form of, for example, a cream, emulsion, or gel.

[0029] In the present invention, the pH inside the hair was measured by freeze-pulverizing 1 g of dry hair to 1 mm or less using liquid nitrogen, immersing it in 100 ml of distilled water at 50°C for 10 minutes, and then cooling it to 25°C, and measuring the pH of the resulting aqueous solution.

[0030] The hair treatment method using the hair cosmetic composition of the present invention includes the following steps: (A) one or more selected from citric acid, glycolic acid, and levulinic acid; (B) a higher alcohol having an alkyl chain containing 14 to 22 carbon atoms; (C) one or more selected from stearyltrimethylammonium chloride and behenyltrimethylammonium chloride Contains The content of the component (A) is 1 to 5 mass %, The viscosity at 20°C is 20,000 to 60,000 mPa·s, The method for treating hair with a hair cosmetic comprises a step of applying the hair cosmetic to the hair in a wet state after treatment with a perm agent, a step of rinsing the hair cosmetic after application, and a step of drying the hair.

[0031] In the hair treatment method of the present invention, the perm treatment means applying a first agent containing an alkaline agent and a reducing agent to the hair, leaving it to stand, and rinsing it off, and then applying a second agent containing an oxidizing agent, leaving it to stand, and rinsing it off.

[0032] Drying in the hair treatment method of the present invention means drying the hair with a hair dryer, natural drying, or the like.

[0033] The alkaline agent contained in the first agent of the perm agent of the present invention is not particularly limited, but examples thereof include ammonia; alkanolamines such as triethanolamine, diethanolamine, monoethanolamine, isopropanolamine, diisopropanolamine, and 2-amino-2-methyl-1-propanol; organic amines such as 2-amino-2-methyl-1,3-propanediol and guanidine; inorganic alkalis such as sodium hydroxide and potassium hydroxide; carbonates such as ammonium carbonate, ammonium bicarbonate, sodium carbonate, sodium bicarbonate, and guanidine carbonate; and basic amino acids and salts thereof such as arginine and lysine.

[0034] The alkaline agent preferably contains one or more selected from ammonia, monoethanolamine, arginine, and guanidine carbonate, from the viewpoint of achieving better hair transformation.

[0035] The reducing agent contained in the first agent of the perm agent of the present invention is not particularly limited, and examples thereof include thioglycolic acids, mercaptopropionic acid or a salt thereof, cysteamine or a salt thereof, thiolactic acid or a salt thereof, thiomalic acid or a salt thereof, butyrolactone thiol, ascorbic acid or a salt thereof, erythorbic acid or a salt thereof, sulfites, thiosulfuric acid or a salt thereof, etc. Examples of the "salts" of mercaptopropionic acid, cysteamine, thiolactic acid, thiomalic acid, ascorbic acid, erythorbic acid, and thiosulfuric acid include hydrochloride, ammonium salt, monoethanolamine salt, and sodium salt.

[0036] Examples of the thioglycolic acids include thioglycolic acid, sodium thioglycolate, ammonium thioglycolate, monoethanolamine thioglycolate, and esters of thioglycolic acid and glycerin.

[0037] Examples of the cysteines include L-cysteine, DL-cysteine, cysteine ​​salts (L-cysteine ​​hydrochloride, DL-cysteine ​​hydrochloride, etc.), acetylcysteine ​​(N-acetyl-L-cysteine, etc.), cysteine ​​alkyl esters (L-cysteine ​​methyl ester, L-cysteine ​​ethyl ester, etc.), and amidinocysteine.

[0038] Examples of the sulfites include sulfurous acid, sulfite salts (ammonium sulfite, potassium sulfite, monoethanolamine sulfite, sodium sulfite, etc.), and hydrogen sulfite salts (sodium hydrogen sulfite, ammonium hydrogen sulfite, etc.).

[0039] The reducing agent contained in the first agent of the perm agent preferably contains one or more types selected from thioglycolic acids and cysteines, from the viewpoint of achieving better hair transformation.

[0040] The oxidizing agent contained in the second agent of the perm agent of the present invention is not particularly limited, but examples thereof include hydrogen peroxide, potassium bromate, sodium bromate, and sodium perborate. [Example]

[0041] The present invention will be described in more detail below with reference to examples, but these examples are not intended to limit the present invention in any way.

[0042] In the evaluation tests described herein, the components and their contents in the hair cosmetics were varied. The units used to indicate the contents of each component are % by mass, and the compositions were prepared using conventional methods.

[0043] In the evaluation test methods shown in this specification, "applicability" and "fingers' ease of running through when rinsing off" were evaluated by the following methods.

[0044] 100 g of the first agent of the perm agent listed in Table 1 was evenly applied to a wig (100% human black hair, Queen Cut No. 775N, manufactured by Beaulux Co., Ltd.), brushed to straighten the waves, left for 15 minutes, and then thoroughly rinsed with hot water set at 40°C. Next, 100 g of the second agent of the perm agent was evenly applied in the same manner as the first agent, combed, left for 15 minutes, and then thoroughly rinsed with hot water set at 40°C. 15 g of the hair cosmetics obtained in the Examples and Comparative Examples were evenly applied to wet hair after washing, and the "applicability" and "feel for running fingers through the hair when rinsing" were evaluated sensorily according to the following evaluation criteria. The pH of the wig hair after treatment with the perm agent was 8.4.

[0045] [Table 1]

[0046] "Applicability" <Evaluation criteria> ⊚: 11 or more out of 15 people felt that the application was good. ◯: Between 5 and 10 out of 15 people felt that the application was good. ×: 4 or less out of 15 people felt that the application was good.

[0047] "Smoothness when rinsing" <Evaluation criteria> ◎: More than 12 out of 15 people felt that the hair felt smooth to the touch when rinsing. Good: Between 8 and 11 out of 15 people felt that the hair felt smooth when rinsing. △: Between 4 and 7 out of 15 people felt that the hair felt smooth when rinsed off. ×: 3 or less out of 15 people felt that the hair felt smooth to the touch when rinsing.

[0048] In the evaluation test methods described herein, "emulsion stability" was evaluated by filling 120 g of the hair cosmetics obtained in the examples and comparative examples into a 140 g sample bottle (Food 140: manufactured by Daiichi Glass Co., Ltd.), leaving it in a thermostatic chamber at 40°C for 6 months, and then visually inspecting the appearance according to the following evaluation criteria.

[0049] "Emulsification stability" <Evaluation criteria> ◎: No changes were observed in the hair cosmetic after 6 months. Good: A slight amount of water bleeding was observed in the hair cosmetic after 6 months. ×: Obvious separation or water discharge was observed in the hair cosmetic within 6 months.

[0050] [Table 2]

[0051] [Table 3]

[0052] Examples 1 to 15 shown in Tables 2 and 3 showed good results in terms of "fingers running through when rinsing," "emulsion stability," and "applicability."

[0053] Hair cosmetics Examples 16 and 17 are described below.

[0054] The hair cosmetics obtained in Examples 16 and 17 were subjected to the same evaluation tests as in Examples 1 to 15, and good results were obtained in terms of "applicability," "fingers running through the hair when rinsing," and "emulsion stability."

[0055] Example 16 Component Content (mass%) (A) Citric acid 3.00 (B) Cetyl alcohol 2.00 (B) Stearyl alcohol 3.00 (C) Stearyltrimethylammonium chloride 0.70 (C) Behenyltrimethylammonium chloride 1.28 Methylpolysiloxane (10mm 2 / s) 4.00 Methylpolysiloxane (350mm 2 / s) 6.00 Highly polymerized methylpolysiloxane (1) (10,000mm 2 / s) 4.00 Squalane 0.01 Argania spinosa kernel oil 0.01 1,3-butylene glycol 7.00 Ethanol 0.62 Methyl parahydroxybenzoate 0.20 Fragrance 0.20 Purified water 67.98 Total 100.00 pH(20℃):2.00 Viscosity (20℃): 47,400mPa·s Example 17 Component Content (mass%) (A) Citric acid 3.00 (B) Cetyl alcohol 2.00 (B) Stearyl alcohol 3.00 (C) Stearyltrimethylammonium chloride 0.70 (C) Behenyltrimethylammonium chloride 1.28 Methylpolysiloxane (10mm 2 / s) 4.00 Methylpolysiloxane (350mm 2 / s) 6.00 Highly polymerized methylpolysiloxane (1) (10,000mm 2 / s) 4.00 Hydrolyzed silk 0.01 Hydrogenated lecithin 0.01 Fucus extract 0.01 Copper sulfate 0.10 1,3-butylene glycol 7.00 Ethanol 0.62 Methyl parahydroxybenzoate 0.20 Fragrance 0.20 Purified water 67.87 total pH(20℃):2.07 Viscosity (20℃): 49,200mPa·s [Industrial Applicability]

[0056] According to the present invention, a hair cosmetic composition having good application properties, good finger combability when rinsed off, and good emulsion stability can be obtained.

Claims

1. A hair cosmetic composition to be applied to hair whose pH has reached 8 or more after treatment with a perm agent, (A) one or more selected from citric acid, glycolic acid, and levulinic acid; (B) a higher alcohol having an alkyl chain containing 14 to 22 carbon atoms; (C) one or more selected from stearyltrimethylammonium chloride and behenyltrimethylammonium chloride Contains The content of the component (A) is 1 to 5 mass %, A hair cosmetic composition having a viscosity of 20,000 to 60,000 mPa·s.

2. (A) one or more selected from citric acid, glycolic acid, and levulinic acid; (B) a higher alcohol having an alkyl chain containing 14 to 22 carbon atoms; (C) one or more selected from stearyltrimethylammonium chloride and behenyltrimethylammonium chloride Contains The content of the component (A) is 1 to 5 mass %, The hair treatment method with the hair cosmetic has a viscosity of 20,000 to 60,000 mPa·s and comprises the steps of applying the hair cosmetic to the hair in a wet state after treatment with a perm agent, rinsing it off, and drying the hair.

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