Scalp protection composition

Abstract

To provide a composition for scalp protection that has excellent usability during application, has reduced irritation to the scalp during the use of a hair coloring agent or a permanent agent, does not impair the effect of the hair coloring agent or permanent agent, and has excellent stability over time.SOLUTION: A composition for scalp protection is used before the use of a hair coloring agent or a permanent agent, the composition for scalp protection containing (A) a cationic thickener, (B) a nonionic thickener, (C) a polyhydric alcohol, (D) ethanol, and (E) organic acid.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a scalp protecting composition. [Background technology]

[0002] Nowadays, it is not uncommon to change hair color using hair coloring agents such as oxidative hair dyes and bleaches, or to change hairstyles using perm agents such as permanent wave agents and hair straighteners at home using commercially available products rather than at a beauty salon.

[0003] Commercially available hair coloring or perming products for home use are designed to have a consistent effect regardless of hair type, so depending on the individual's constitution, the amount of alkaline or oxidizing agent used as an active ingredient may be slightly excessive. As a result, scalp irritation may be felt while using the hair coloring or perming product.

[0004] In light of this, pretreatment agents have been developed to protect the scalp before using hair coloring agents or perm agents. For example, there is an oily pretreatment agent containing hydrocarbons and hydrophobic silica that reduces or prevents scalp irritation and prevents discoloration or staining of the scalp (Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2017-43583 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the oily pretreatment agent described in Patent Document 1 spreads poorly on the scalp when applied, potentially failing to reach the entire scalp. Patent Document 1 also does not provide any specific details regarding scalp irritation during use of a hair coloring agent or perm, leaving its effectiveness uncertain. Furthermore, the oily pretreatment agent creates a film on the hair, inhibiting the effects of the hair coloring agent or perm, leaving the hair in a state that is not fully satisfactory after application. Furthermore, the stability of the oily pretreatment agent over time under low-temperature and high-temperature conditions is also uncertain, leaving room for improvement. [Means for solving the problem]

[0007] As a result of intensive research into solving the above problems, the present inventors discovered that the above problems can be solved by providing a scalp protection composition to be used before the use of a hair coloring agent or a perm agent, the scalp protection composition being characterized by containing (A) a cationic thickener, (B) a nonionic thickener, (C) a polyhydric alcohol, (D) ethanol, and (E) an organic acid, and thus completed the present invention. [Effects of the Invention]

[0008] The present invention provides a scalp protecting composition that is easy to use when applied, suppresses irritation to the scalp during use of a hair coloring agent or a perm agent, does not impair the effects of the hair coloring agent or the perm agent, and has excellent stability over time. 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 scalp protecting composition according to the present invention contains (A) a cationic thickener from the viewpoint of ease of application.

[0011] The component (A) used in the present invention is not particularly limited, and examples thereof include O-[2-hydroxy-3-(trimethylammonio)propyl]hydroxyethylcellulose chloride, O-[2-hydroxy-3-(trimethylammonio)propyl]guar gum chloride, locust bean hydroxypropyltrimonium chloride, polydimethyldimethylenepyrrolidinium chloride, dimethyldiallylammonium chloride-acrylamide copolymer, and dimethyldiallylammonium chloride-acrylic acid copolymer, and one or more selected from these may be contained. Among these, from the viewpoint of improving usability during application, O-[2-hydroxy-3-(trimethylammonio)propyl]hydroxyethylcellulose chloride and O-[2-hydroxy-3-(trimethylammonio)propyl]guar gum chloride are preferred, and O-[2-hydroxy-3-(trimethylammonio)propyl]hydroxyethylcellulose chloride is more preferred.

[0012] The scalp protecting composition according to the present invention contains (B) a nonionic thickener from the viewpoint of ease of application.

[0013] The component (B) used in the present invention is not particularly limited, and examples thereof include hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropylmethyl cellulose, polyvinyl alcohol, polyvinylpyrrolidone, dextrin, etc., and one or more selected from these may be contained. Among these, from the viewpoint of improving usability during application, hydroxyethyl cellulose and hydroxypropyl cellulose are preferred, and hydroxyethyl cellulose is more preferred.

[0014] The total amount of the components (A) and (B) in the scalp protection composition of the present invention is not particularly limited, but is preferably 0.8 to 2.4%, more preferably 1.2 to 2%. If the total amount of the components (A) and (B) is less than 0.8%, the ease of application may be impaired and scalp irritation caused by the hair color or perm agent may not be suppressed. If the total amount of the components (A) and (B) exceeds 2.4%, the ease of application may be impaired and the effectiveness of the hair color or perm agent may be impaired.

[0015] The mass ratio (A) / (B) of the contents of the component (A) and the component (B) used in the present invention is not particularly limited, but from the viewpoint of improving usability during application, it is preferably in the range of 0.6 to 1.67, more preferably 0.78 to 1.29.

[0016] The scalp protecting composition according to the present invention contains (C) a polyhydric alcohol in order to reduce irritation to the scalp during use of a hair coloring agent or a perm agent.

[0017] The component (C) used in the present invention is not particularly limited, and examples thereof include 1,3-butylene glycol, glycerin, ethylene glycol, dipropylene glycol, 1,2-pentanediol, 1,2-hexanediol, propylene glycol, diethylene glycol, polyethylene glycol, etc., and the component (C) may contain one or more selected from these. Among these, (C1) 1,3-butylene glycol and (C2) glycerin and ethylene glycol are preferred from the viewpoint of reducing irritation to the scalp during use of a hair coloring agent or perm agent.

[0018] The combined use of the components (C1) and (C2) used in the present invention can reduce irritation to the scalp during use of a hair coloring agent or a perm agent and improve the effectiveness of the hair coloring agent or the perm agent.

[0019] The content of the component (C) used in the present invention is not particularly limited, but is preferably 5 to 15%, more preferably 7.5 to 12.5%. If the component (C) is less than 5%, it may not be possible to prevent scalp irritation during use of a hair coloring agent or perm agent. If the component (C) is more than 15%, the effectiveness of the hair coloring agent or perm agent may be impaired.

[0020] When the component (C1) and the component (C2) are used in combination in the present invention, the mass ratio (C1) / (C2) of their contents is not particularly limited, but from the viewpoint of suppressing irritation to the scalp during use of a hair coloring agent or a perm agent and from the viewpoint of improving the effects of the hair coloring agent or the perm agent, it is preferably in the range of 1 to 2.13, more preferably 1.22 to 1.86.

[0021] The scalp protecting composition according to the present invention contains (D) ethanol in order to enhance the effectiveness of the hair coloring agent or perm agent.

[0022] The content of the component (D) used in the present invention is not particularly limited, but is preferably 15 to 45%, more preferably 20 to 40%. If the component (D) is less than 15%, the ease of application and the effectiveness of the hair coloring agent or perm agent may be impaired. If the component (D) is more than 45%, the ease of application and the effectiveness of the hair coloring agent or perm agent may be impaired, and irritation to the scalp during use of the hair coloring agent or perm agent may not be suppressed.

[0023] The scalp protecting composition according to the present invention contains an organic acid (E) from the viewpoint of stability over time.

[0024] The component (E) used in the present invention is not particularly limited, and examples thereof include lactic acid, citric acid, oxalic acid, malic acid, succinic acid, etc., and one or more selected from these may be contained. Among these, from the viewpoint of improving stability over time, lactic acid and malic acid are preferred, and lactic acid is more preferred.

[0025] The content of the component (E) used in the present invention is not particularly limited, but is preferably 0.01 to 0.1%, more preferably 0.02 to 0.08%. If the content of the component (E) is less than 0.01% or more than 0.1%, the stability over time may be reduced.

[0026] The appearance of the scalp protecting composition according to the present invention is not particularly limited, but from the viewpoint of stability over time, it is preferably transparent.

[0027] In addition to the above-mentioned ingredients, the scalp protecting composition of the present invention may contain ingredients commonly used in cosmetics, provided that the effects of the present invention are not impaired. For example, oils such as higher alcohols and higher fatty acids, surfactants, moisturizers, antioxidants, UV absorbers, chelating agents, preservatives, antibacterial agents, protein derivatives, hydrolyzed proteins, amino acids, stabilizers, fragrances, animal and vegetable oils, vitamins, plant extracts, inorganic salts, etc., and one or more of these may be contained depending on the purpose.

[0028] The viscosity of the scalp protecting composition according to the present invention at 20°C is not particularly limited, but is preferably 2,000 to 10,000 mPa·s.

[0029] In the present invention, the viscosity is measured by preparing the scalp protection composition in a conventional manner, filling 120 g of the resulting composition into a sample bottle (Food 140: manufactured by Daiichi Glass Co., Ltd.), and measuring the viscosity using a B-type viscometer (model: digital viscometer TVB-10M, manufactured by Toki Sangyo Co., Ltd.) with an M4 rotor for 1 minute at a rotation speed of 30 rpm and at 20°C.

[0030] The pH of the scalp protecting composition according to the present invention at 20°C is not particularly limited, but is preferably 4.0 to 6.0.

[0031] In the present invention, the pH is adjusted by a conventional method, and 120 g of the obtained scalp protection composition is filled into a sample bottle (Food 140: manufactured by Daiichi Glass Co., Ltd.), and the pH is measured at 20°C using a glass electrode hydrogen ion concentration indicator (F-71: manufactured by Horiba Ltd.).

[0032] The formulation of the scalp protecting composition according to the present invention is not particularly limited, but is preferably a viscous liquid.

[0033] The method of using the scalp protection composition according to the present invention is preferably to apply it to the entire dry scalp and hair, and then immediately thereafter use a hair colorant or perm agent according to the prescribed dosage and administration without rinsing off the scalp protection composition. [Example]

[0034] 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.

[0035] In the evaluation tests shown in this specification, the components contained in the scalp protecting composition and their contents were varied. The units showing the contents of each component are all % by mass, and these were prepared by conventional methods, and the evaluation tests were carried out using the obtained scalp protecting composition.

[0036] In the invention described herein, the following were evaluated: "ease of use during application," "irritation to the scalp during use of the hair coloring agent or perm agent," "effect of the hair coloring agent or perm agent," and "stability over time."

[0037] In the evaluation tests shown in this specification, "usability during application" was evaluated by a comparative evaluation conducted by 20 expert panelists who applied 20 g of the obtained scalp protection composition to dry scalp and all over the hair.

[0038] In the evaluation tests shown in this specification, "scalp irritation during use of a hair coloring agent or perm agent" was evaluated by applying 20 g of the obtained scalp protection composition to the entire dry scalp and hair, and then immediately using a hair coloring agent or perm agent according to the prescribed usage and dosage without rinsing off the scalp protection composition. A total of 20 expert panelists, 10 each, performed this process, and each test was compared and evaluated.

[0039] In the evaluation tests shown in this specification, the "effects of hair coloring or perming agents" were evaluated by applying 10 g of the obtained scalp protection composition to half of the dry hair of a hair test doll ("Cutting Mannequin No. 775N" manufactured by Beaulux Co., Ltd.), and then immediately thereafter applying a hair coloring or perming agent to the entire hair in accordance with the prescribed usage and dosage without rinsing off the scalp protection composition. This process was carried out by a total of 20 expert panelists, 10 each, and each was compared and evaluated.

[0040] The hair coloring agent is prepared by mixing the first and second hair coloring agents described in Formulation Example 1 in a 1:1 ratio, applying a total of 100g to the hair, leaving it for 20 minutes, rinsing with lukewarm water at 40°C, washing thoroughly with shampoo, wiping off the water with a towel, and drying with a hair dryer. The perm agent is prepared by applying 100g of the first perm agent described in Formulation Example 2 to the hair, leaving it for 15 minutes, rinsing with lukewarm water at 40°C, applying 100g of the second perm agent to the hair, leaving it for 15 minutes, rinsing with lukewarm water at 40°C, wiping off the water with a towel, and drying with a hair dryer.

[0041] In the evaluation tests shown in this specification, "stability over time" was evaluated by filling 120 g of the obtained scalp protection composition into a sample bottle (Food 140: manufactured by Daiichi Glass Co., Ltd.) and visually inspecting the appearance after leaving it undisturbed in a thermostatic bath at 5°C and 50°C for 3 months.

[0042] Evaluation criteria for "ease of use when applying" ◎: More than 16 out of 20 people answered that it can be applied to the entire scalp and hair without dripping from the hands. 〇: Between 6 and 15 out of 20 people answered that it can be applied to the entire scalp and hair without dripping from the hands. ×: Less than 5 out of 20 people answered that they could apply it to the entire scalp and hair without it dripping from their hands.

[0043] Evaluation criteria for "scalp irritation during use of hair coloring or perming agents" ◎: More than 8 out of 10 people answered that they did not feel any irritation to the scalp. 〇: 3 to 7 out of 10 people answered that they did not feel any irritation on their scalp. ×: Less than 2 out of 10 people answered that they did not feel any irritation to the scalp

[0044] Evaluation criteria for "effects of hair coloring or perming agents" ◎: More than 8 out of 10 people answered that they felt a clear effect 〇: 3 to 7 out of 10 people answered that they felt a clear effect. ×: Less than 2 out of 10 people answered that they felt a clear effect

[0045] Evaluation criteria for "stability over time" ◎: No layer separation and no cloudiness at all ◯: No layer separation, slight cloudiness ×: Layer separation or cloudy

[0046] First evaluation test In the first evaluation test, scalp protecting compositions containing various types and amounts of (A) cationic thickener and (B) nonionic thickener were evaluated. Table 1 shows the ingredients, amounts, and evaluation results of the scalp protecting compositions.

[0047] [Table 1]

[0048] In Examples 1 to 11, good results were obtained even when the types and contents of the (A) cationic thickener and the (B) nonionic thickener were changed in various ways.

[0049] Second evaluation test In the second evaluation test, scalp protecting compositions containing various types and amounts of (C) polyhydric alcohol were evaluated. Table 2 shows the ingredients, amounts, and evaluation results of the scalp protecting compositions.

[0050] [Table 2]

[0051] In Examples 12 to 23, good results were obtained even when the type and content of the polyhydric alcohol (C) was changed in various ways.

[0052] Third evaluation test In the third evaluation test, scalp protecting compositions with various contents of (D) ethanol were evaluated. Table 3 shows the ingredients, contents, and evaluation results of the scalp protecting compositions.

[0053] [Table 3]

[0054] In Examples 24 to 28, good results were obtained even when the content of (D) ethanol was changed in various ways.

[0055] 4th evaluation test In the fourth evaluation test, scalp protecting compositions containing various types and amounts of (E) organic acid were evaluated. Table 4 shows the ingredients, amounts, and evaluation results of the scalp protecting compositions.

[0056] [Table 4]

[0057] In Examples 29 to 34, good results were obtained even when the type and content of the (E) organic acid was changed in various ways.

[0058] Examples 35 and 36 are shown below. The scalp protecting compositions obtained in Examples 35 and 36 gave good results in terms of "usability during application," "irritation to the scalp during use of a hair coloring agent or perm," "effects of the hair coloring agent or perm," and "stability over time."

[0059] Example 35 <Scalp protection composition> Element Content (%) (A) O-[2-hydroxy-3-(trimethylammonio) chloride Propyl]hydroxyethyl cellulose 0.80 (B) Hydroxyethyl cellulose 0.80 (C) 1,3-butylene glycol 6.00 (C) Glycerin 4.00 (D) Ethanol 30.00 (E) Lactic acid 0.05 Potassium hydroxide 0.02 Methyl parahydroxybenzoate 0.10 Disodium edetate 0.02 Hydrolyzed silk liquid 0.01 Seaweed extract (1) 0.01 Purified water 58.19 Total 100.00 Viscosity (20℃): 4,900mPa·s pH(20℃):5.07

[0060] Example 36 <Scalp protection composition> Element Content (%) (A) O-[2-hydroxy-3-(trimethylammonio) chloride Propyl]hydroxyethyl cellulose 0.80 (B) Hydroxyethyl cellulose 0.80 (C) 1,3-butylene glycol 6.00 (C) Glycerin 4.00 (D) Ethanol 30.00 (E) Lactic acid 0.05 Polyoxyethylene hydrogenated castor oil (60E.O.) 0.30 Potassium hydroxide 0.02 Methyl parahydroxybenzoate 0.10 Disodium edetate 0.02 Hydrolyzed silk liquid 0.01 Seaweed extract (1) 0.01 Fragrance 0.03 Purified water 57.86 Total 100.00 Viscosity (20℃): 4,780mPa·s pH(20℃):5.06

[0061] (Prescription Example 1) <Hair color 1st agent> Element Content (%) Paraaminophenol 0.2 Resorcinol 0.2 Cetyl alcohol 3.0 Stearyltrimethylammonium chloride 2.0 Polyoxyethylene cetyl ether (20E.O.) 3.0 Liquid Paraffin 2.0 L-ascorbic acid 0.5 Monoethanolamine liquid (80%) 8.0 Ammonia water (28%) 4.0 Purified water 77.1 Total 100.0 <Hair color second agent> Element Content (%) Cetyl alcohol 1.0 Stearyltrimethylammonium chloride 0.3 Polyoxyethylene stearyl ether (20E.O.) 0.5 Liquid paraffin 0.2 Hydroxyethanediphosphonic acid liquid 0.1 Hydrogen peroxide (35%) 17.0 Purified water 80.9 Total 100.0

[0062] (Prescription example 2) <Perm 1st Agent> Element Content (%) Cetyl alcohol 7.0 Stearyltrimethylammonium chloride 2.0 Polyoxyethylene cetyl ether (10E.O.) 2.0 Methylpolysiloxane 2.0 Concentrated glycerin 1.0 Hydroxyethanediphosphonic acid liquid 0.2 Diammonium hydrogen phosphate 1.5 Ammonium chloride 0.5 Urea 1.5 Guanidine carbonate 5.0 L-Cysteine ​​Hydrochloride 2.0 Monoethanolamine thioglycolate solution (50%) 17.0 40% Diammonium Dithiodiglycolate Solution 7.0 Monoethanolamine liquid (80%) 1.0 Purified water 50.3 Total 100.0 <Perm 2nd Agent> Element Content (%) Cetyl alcohol 8.0 Stearyltrimethylammonium chloride 2.0 Polyoxyethylene stearyl ether (20E.O.) 0.5 Liquid Paraffin 2.0 Hydroxyethanediphosphonic acid liquid 0.1 Hydrogen peroxide (35%) 7.0 Purified water 80.4 Total 100.0 [Industrial Applicability]

[0063] The present invention can provide a scalp protecting composition that is easy to use when applied, reduces irritation to the scalp during use of a hair coloring agent or a perm agent, does not impair the effects of the hair coloring agent or the perm agent, and has excellent stability over time.

Claims

1. A scalp protecting composition to be used before using a hair coloring agent or a perm agent, (A) one or more selected from O-[2-hydroxy-3-(trimethylammonio)propyl]hydroxyethylcellulose chloride and O-[2-hydroxy-3-(trimethylammonio)propyl]guar gum chloride; (B) one or more selected from hydroxyethyl cellulose and hydroxypropyl cellulose; (C) one or more selected from 1,3-butylene glycol, glycerin, and ethylene glycol; (D) ethanol, (E) one or more selected from lactic acid and malic acid; a total content of the component (A) and the component (B) of 0.8 to 2.4% by mass, a content of the component (C) of 5 to 15% by mass, a content of the component (D) of 15 to 45% by mass, a content of the component (E) of 0.01 to 0.1% by mass, and a mass ratio (A) / (B) of the contents of the component (A) and the component (B) of 0.6 to 1.

67.

2. The scalp protecting composition according to claim 1, characterized in that the component (C) contains (C1) 1,3-butylene glycol and (C2) glycerin, and the mass ratio (C1) / (C2) of the contents of the component (C1) and the component (C2) is 1 to 2.

13.

3. A method of applying the scalp protection composition described in claim 1 to the entire dry scalp and hair, and then using a hair colorant or perm agent immediately thereafter without rinsing off the scalp protection composition.

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