Hair dyeing composition containing natural ingredients

Abstract

The present invention relates to a hair dyeing composition containing natural ingredients, and more specifically, to a hair dyeing composition comprising a first agent containing a complex extract of Centella asiatica and Chaga mushroom and plant-based polyphenols, and a second agent containing silver sulfate, which exhibits excellent dyeing properties without scalp irritation or hair damage.

Description

Technology Field

[0001] The present invention relates to a hair dyeing composition containing natural ingredients, and more specifically, to a hair dyeing composition comprising a first agent containing a complex extract of Centella asiatica and Chaga mushroom and plant-based polyphenols, and a second agent containing silver sulfate, which exhibits excellent dyeing properties without scalp irritation or hair damage. Background Technology

[0002] Hair plays a crucial role in protecting the scalp while regulating humidity to maintain body temperature. The structure of hair consists of an outermost cuticle layer, a cortex layer inside the cuticle, and a Medela layer at the very center, located inside the cortex layer. The raw material for hair is red blood cells; the hair root transforms into hair matrix cells, elongates, and keratinizes, protruding from the skin at a rate of about 0.3 to 0.4 mm per day to become hair. This hair is not a dead body that has finished growing, but rather a living organism connected to the hair papilla located underneath, undergoing constant changes involving nerves and blood vessels. Cell division occurs within the hair matrix cells present in the hair papilla of the scalp follicle, pushing the hair upward to grow. Therefore, the area above the hair matrix cells, where cell division does not occur, cannot be considered living cells; consequently, if the hair that has grown above the scalp is damaged, it cannot regenerate on its own.

[0003] Among the synthetic dyes used for hair dyeing, the most widely commercialized oxidative hair dye currently consists of a first component and a second component. The method involves measuring and mixing the first and second components in equal proportions, applying them to the hair, leaving it on for 30 minutes, and then rinsing with water. While the oxidative dyes used in the first component have excellent dyeing power and durability, they have the disadvantage of containing dyes that can cause scalp allergies, such as p-phenylenediamine, m-aminophenol, resorcinol, and toluene-2,5-diamine sulfate. When hair dye comes into contact with the scalp during a dyeing procedure, quinonediamine and quinoneimine, which are produced by the metabolic oxidation of oxidative dyes, bind to amino acids and proteins, triggering a sensitization reaction. Additionally, p-nitrosoaniline, an oxidation product of the dye, and Bandrowski's bases undergo a strong cross-reaction, causing a sensitization reaction on the scalp. These allergic symptoms vary widely, ranging from mild symptoms such as itching and redness to severe ones including erythema, swelling, and blisters. Even if symptoms are mild immediately after the procedure, they often intensify after 2-3 days, causing damage to the scalp. Furthermore, since the second component of oxidative hair dyes uses hydrogen peroxide, a powerful oxidizing agent, it oxidizes the hair and scalp during the process, inevitably leading to damage and premature aging.

[0004] Oxidative hair dyes have a pH of 9.5–12.5 for the first component and 2.5–4.0 for the second component; however, when mixed in equal amounts, the resulting pH is a strong alkaline range of 9.0–11.5, which causes swelling of the scalp and hair, thereby accelerating damage to the hair as well as the scalp. Such damage can occur with just a single treatment, and if treatments are performed every few months, irritant contact dermatitis of the scalp and allergic symptoms caused by sensitization reactions progress rapidly. Furthermore, because the damage extends not only to the outermost cuticle layer of the hair but also to the middle cortex layer, there is a problem in that it is difficult to restore the hair even if treatments are performed to alleviate and repair the damage.

[0005] Since damaged hair consists of dead cells that cannot regenerate on their own, it is crucial to minimize hair damage during dyeing. At the same time, it is important to enhance dyeability and color longevity. Recently, consumer demands in the hair dyeing field have expanded beyond mere low irritation, color retention, and damage minimization to include strong color development, ease of the dyeing process, and formulas containing the maximum possible amount of natural ingredients.

[0006] In line with this trend, many self-dyeing products containing natural ingredients and shampoo-type hair dyes have recently been released, but they still have the disadvantage of being quite cumbersome because they use allergenic ingredients and hydrogen peroxide, and require the process of mixing the first and second dyes, applying them to the hair, leaving them on for at least 30 minutes, and then rinsing with water.

[0007] Therefore, there is an urgent need to develop natural hair dyeing products that do not contain allergy-causing ingredients by not adding artificial pigments or dyes to the first solution, and do not damage hair or scalp by not adding hydrogen peroxide to the second solution. Furthermore, there is a need for a hair dyeing technology that allows for the application of the first and second solutions by mixing them, and provides excellent dyeability and color retention even when applied without rinsing with water, thereby ensuring ease of the dyeing process.

[0008] Accordingly, the inventors of the present invention have endeavored to develop such a hair dyeing composition. As a result, the present invention was completed by confirming that a hair dyeing composition comprising a first agent containing a complex extract of Centella asiatica and Chaga mushroom, which are natural ingredients, and plant-based polyphenols, and a second agent containing silver sulfate, possesses excellent dyeability and dye retention without scalp irritation or hair damage, as well as ease of dyeing. Prior art literature

[0009] (0001) Republic of Korea Published Patent No. 10-2010-0079278 (2010.07.08) (0002) Republic of Korea Published Patent No. 10-2022-0162961 (2022.12.09) The problem to be solved

[0010] The present invention aims to provide a hair dyeing composition containing natural ingredients that exhibits excellent dyeability and dye retention without scalp irritation or hair damage. means of solving the problem

[0011] To achieve the above objective, according to the present invention, a cosmetic composition for hair dyeing is provided, comprising a first agent containing a complex extract of Centella asiatica and Chaga mushroom and a plant polyphenol, and a second agent containing silver sulfate.

[0012] Preferably, the plant polyphenol is characterized by being at least one selected from the group consisting of epigallocatechin gallate (EGCG), gallic acid, and tannic acid.

[0013] The first formulation above may further contain at least one selected from the group consisting of eggplant fruit extract, persimmon extract, guava leaf extract, strawberry extract, blackberry extract, raspberry extract, quince extract, chestnut extract, black cumin seed extract, blueberry extract, salvia leaf extract, shea butter extract, lotus leaf extract, cucumber root extract, quinoa seed extract, grape extract, white willow extract, feverfew extract, bamboo extract, acorn extract, and Cornus fruit extract.

[0014] The above-mentioned complex extract of Centella asiatica and Chaga mushroom is characterized by being prepared by mixing Centella asiatica and Chaga mushroom in a weight ratio of 1 to 3:1 to 3, respectively, and more preferably by mixing in a weight ratio of 1:1, respectively.

[0015] In the preparation of the above extract, at least one solvent selected from the group consisting of water, anhydrous alcohol having 1 to 4 carbon atoms, ethyl acetate, acetone, glycerin, ethylene glycol, propylene glycol, butylene glycol, caprylic / capric triglyceride, dimethicone, mineral oil, cyclomethicone, octyldodecanol, cetyl ethylhexanoate, trilethylhexanoin, isopropyl myristate, and vegetable oil may be used.

[0016] The above Centella asiatica and Chaga mushroom complex extract is contained in a ratio of 5 to 20 weight percent based on the total weight of the first agent.

[0017] The above first and second agents may further contain polyacrylate, surfactant, pH adjuster, additive, preservative, and fragrance.

[0018] The above silver sulfate is contained in a ratio of 0.01 to 10.0 weight% relative to the total weight of the second agent.

[0019] Preferably, the pH of the first agent is 3.0-6.0 and the pH of the second agent is 2.5-5.0.

[0020] The above cosmetic composition for hair dyeing can be used for gray hair coverage. Effects of the invention

[0021] The hair dyeing composition of the present invention does not use oxidative hair dyes or hydrogen peroxide, and contains natural ingredients, exhibiting excellent dyeability and dye retention without scalp irritation or hair damage. In addition, it is convenient because there is no need to rinse with water after dyeing. Brief explanation of the drawing

[0022] Figure 1 is a photograph showing the color development of a hair dyeing composition prepared according to an embodiment of the present invention. Figure 2 is a photograph showing the immediate color development of a hair dyeing composition prepared according to an embodiment of the present invention. Figure 3 is a photograph showing the gray hair coverage power of a hair dyeing composition prepared according to an embodiment of the present invention. Figure 4 is a photograph of a scalp damage evaluation experiment of a hair dyeing composition prepared according to an embodiment of the present invention. Specific details for implementing the invention

[0023] The present invention will be described in detail below.

[0024] The present invention relates to a hair dyeing composition comprising a first agent containing a complex extract of natural ingredients Centella asiatica and Chaga mushroom and plant-based polyphenols, and a second agent containing silver sulfate.

[0025] The above-mentioned complex extract of Centella asiatica and Chaga mushroom is prepared by mixing Centella asiatica and Chaga mushroom in a weight ratio of 1 to 3:1 to 3, respectively. The above-mentioned complex extract of Centella asiatica and Chaga mushroom is contained in a ratio of 5 to 20 weight percent relative to the total weight of the first agent. By containing the above-mentioned complex extract of Centella asiatica and Chaga mushroom, not only are dyeability and dye retention improved, but hair damage and scalp irritation are also suppressed.

[0026] The above plant polyphenol is at least one selected from the group consisting of epigallocatechin gallate (EGCG), gallic acid, and tannic acid, and it is more preferable to use gallic acid and tannic acid together as they exhibit superior color development. The above plant polyphenol is contained in an amount of 1 to 5 weight percent based on the total weight of the first agent.

[0027] In addition, in the hair dyeing composition of the present invention, the first agent may further include extracts containing plant-based polyphenols. According to one embodiment of the present invention, at least one selected from the group consisting of eggplant fruit extract, persimmon extract, guava leaf extract, strawberry extract, blackberry extract, raspberry extract, quince extract, chestnut extract, black cumin seed extract, blueberry extract, salvia leaf extract, shea butter extract, lotus leaf extract, cucumber root extract, quinoa seed extract, grape extract, white willow extract, feverfew extract, bamboo extract, acorn extract, and Cornus fruit extract may be further included.

[0028] The hair dyeing composition of the present invention is characterized by containing silver sulfate (Ag2SO4) in the second agent. The silver sulfate forms a complex compound through coordination bonding with plant polyphenols contained in the first agent, thereby dyeing the hair black. At this time, the silver sulfate is contained in a ratio of 0.01 to 10.0 weight% relative to the total weight of the second agent.

[0029] According to one embodiment of the present invention, silver sulfate reacts with the epigallocatechin gallate (EGCG) of the first agent to form a black complex.

[0030]

[0031]

[0032] In addition, according to another embodiment of the present invention, a black complex is formed by reacting with the gallic acid of the first agent.

[0033]

[0034]

[0035] It does not contain hydrogen peroxide or oxidative dyes that damage hair, and since it dyes hair using plant-based polyphenols, there is absolutely no scalp allergy or irritation. In addition, it offers the convenience of dyeing as gray hair is automatically dyed after just 1-2 weeks without rinsing with water.

[0036] Preferably, the pH of the first agent is 3.0-6.0, and the pH of the second agent is adjusted to 2.5-5.0. When mixed, the pH is 3.0-6.0, which is similar to the isoelectric point of hair (pH 4.5-5.5). Since this does not damage the cuticle of the outermost layer of the hair or the cortex layer of the middle layer, and does not irritate the scalp, there is no damage to the hair or scalp even if the treatment is performed repeatedly multiple times.

[0037] In the hair dyeing composition of the present invention, the first and second agents may further contain polyacrylate, a surfactant, a pH adjuster, an additive, a preservative, and a fragrance.

[0038] According to one embodiment of the present invention, the polyacrylate may be composed of a copolymer of acrylic acid, acrylamide, sodium acrylate, and sodium acryloyldimethyltaurate monomers, and is contained in a ratio of 0.01 to 20.0 weight% based on the total weight.

[0039] As the above surfactant, one or more selected from the group consisting of nonionic surfactants and cationic surfactants may be used, and according to one embodiment of the present invention, polysorbate and sorbitan isostearate are used in a ratio of 0.01 to 30 weight%.

[0040] The hair dyeing composition of the present invention may further include additives. The additives are not particularly limited, and specifically, polyquaternium, conditioning agents, moisturizers, preservatives, fragrances, thickeners, softeners, extracts, and oils may be used. Polyquaternium is a cationic polymer that, together with conditioning agents, softeners, and oils, nourishes damaged and negatively charged hair, prevents static electricity, and makes the hair smooth.

[0041] According to one embodiment of the present invention, the hair dyeing composition is prepared as follows.

[0042] i) a step of adding a complex extract of Centella asiatica and Chaga mushroom and a plant-based polyphenol to purified water, heating to a temperature of 70°C to 80°C, and stirring at a speed of 2,000 to 3,000 rpm for 20 to 30 minutes; ii) a step of cooling to 40°C, adding a surfactant and a polyacrylate to the solution, and stirring at a speed of 2,000 to 3,000 rpm for 20 to 30 minutes; and iii) a step of adding an additive and a pH adjuster to the solution and stirring at a speed of 2,000 to 3,000 rpm for 20 to 30 minutes to prepare a first agent.

[0043] In addition, a second agent is prepared by including the following steps: i) adding silver sulfate to purified water, heating to a temperature of 70°C to 80°C, and stirring at a speed of 2,000 to 3,000 rpm for 20 to 30 minutes; ii) cooling to 40°C, adding a surfactant and a polyacrylate to the solution, and stirring at a speed of 2,000 to 3,000 rpm for 20 to 30 minutes; iii) adding a mordant to the solution and stirring at a speed of 2,000 to 3,000 rpm for 20 to 30 minutes; and iv) adding an additive and a pH adjuster to the solution and stirring at a speed of 2,000 to 3,000 rpm for 20 to 30 minutes.

[0044] The hair dyeing composition of the present invention can be applied in a conventional formulation. According to one embodiment of the present invention, the first component and the second component can be filled into separate containers in the form of an essence and mixed for use, or alternatively, the first component and the second component can each be filled into an aluminum can along with LPG gas and discharged in the form of a mousse for mixed use.

[0045] [Example]

[0046] The present invention will be explained in more detail below through examples and test examples.

[0048] Preparation Example 1: Preparation of a complex extract of Centella asiatica and Chaga mushroom

[0049] 50g of dried Centella asiatica and 50g of Chaga mushroom were mixed, 10 times the weight of water was added as the extraction solvent, and the mixture was heated to 50°C for 3 hours in an extractor equipped with a condenser (Cosmos-660, Kyungseo Machinery). The obtained supernatant was filtered twice using an Advantec No. 5 filter paper and a Whatman GFC 150 mm filter paper to prepare an extract.

[0051] Example 1: Preparation of a hair dyeing composition

[0052] Gray hair care hair essences were prepared according to the compositions of Table 1 and Table 2 below, respectively.

[0053] Gray Hair Care Hair Essence Part 1 　 division Ingredient Name Content (weight%) 1 purified water purified water To 100 2 antioxidants Epigallocatechin gallate 2.600 3 antioxidants tannic acid 0.050 4 Film-forming agent Polyacrylate-13 0.780 5 emulsifier Polysorbate 20 0.065 6 emulsifier Sorbitan isostearate 0.052 7 pH adjuster Citric acid 0.020 8 oil Polyisobutene 0.364 9 oil Cetylethylhexanoate 1.000 10 antiseptic 1,2-hexanediol 0.175 11 antiseptic Butylene glycol 0.175 12 antiseptic Caprylyl glycol 0.146 13 antiseptic Star anise extract 0.005 14 moisturizer glycerin 2.000 15 incense spices 0.100

[0055] Gray Hair Care Hair Essence Part 2 　 division Ingredient Name Content (weight%) 1 purified water purified water To 100 2 Inorganic salts Silver sulfate 0.400 3 Film-forming agent Polyacrylate-13 2.160 4 emulsifier Polysorbate 20 0.180 5 emulsifier Sorbitan isostearate 0.144 6 pH adjuster Citric acid 0.250 7 oil Polyisobutene 　0.008 8 oil Cetylethylhexanoate 1.000 9 antiseptic 1,2-hexanediol 0.175 10 antiseptic Butylene glycol 0.175 11 antiseptic Caprylyl glycol 0.146 12 antiseptic Star anise extract 0.005 13 moisturizer glycerin 2.000 14 incense spices 0.100

[0057] Example 2: Preparation of a hair dyeing composition

[0058] Gray hair care hair essences were prepared according to the compositions of Tables 3 and 4 below, respectively.

[0059] Gray Hair Care Hair Essence Part 1 　 division Ingredient Name Content (weight%) 1 purified water purified water To 100 2 antioxidants gallic acid 2.600 3 antioxidants tannic acid 0.05 4 Film-forming agent Polyacrylate-13 0.780 5 emulsifier Polysorbate 20 0.065 6 emulsifier Sorbitan isostearate 0.052 7 pH adjuster Citric acid 0.020 8 oil Polyisobutene 0.364 9 oil Cetylethylhexanoate 1.000 10 antiseptic 1,2-hexanediol 0.175 11 antiseptic Butylene glycol 0.175 12 antiseptic Caprylyl glycol 0.146 13 antiseptic Star anise extract 0.005 14 moisturizer glycerin 2.000 15 incense spices 0.100

[0061] Gray Hair Care Hair Essence Part 2 　 division Ingredient Name Content (weight%) 1 purified water purified water To 100 2 Inorganic salts Silver sulfate 0.400 3 Film-forming agent Polyacrylate-13 2.160 4 emulsifier Polysorbate 20 0.180 5 emulsifier Sorbitan isostearate 0.144 6 pH adjuster Citric acid 0.250 7 oil Polyisobutene 　0.008 8 oil Cetylethylhexanoate 1.000 9 antiseptic 1,2-hexanediol 0.175 10 antiseptic Butylene glycol 0.175 11 antiseptic Caprylyl glycol 0.146 12 antiseptic Star anise extract 0.005 13 moisturizer glycerin 2.000 14 incense spices 0.100

[0063] Example 3: Preparation of a hair dyeing composition

[0064] Gray hair care hair essences were prepared according to the compositions of Tables 5 and 6 below, respectively.

[0065] Gray Hair Care Hair Essence Part 1 　 division Ingredient Name Content (weight%) 1 purified water purified water To 100 2 antioxidants Epigallocatechin gallate 2.600 3 extract Complex extract of Centella asiatica and Chaga mushroom (Preparation Example 1) 10.000 4 antioxidants tannic acid 0.050 5 Film-forming agent Polyacrylate-13 0.780 6 emulsifier Polysorbate 20 0.065 7 emulsifier Sorbitan isostearate 0.052 8 pH adjuster Citric acid 0.020 9 oil Polyisobutene 0.364 10 oil Cetylethylhexanoate 1.000 11 antiseptic 1,2-hexanediol 0.175 12 antiseptic Butylene glycol 0.175 13 antiseptic Caprylyl glycol 0.146 14 antiseptic Star anise extract 0.005 15 moisturizer glycerin 2.000 16 incense spices 0.100

[0067] Gray Hair Care Hair Essence Part 2 　 division Ingredient Name Content (weight%) 1 purified water purified water To 100 2 Inorganic salts Silver sulfate 0.400 3 Film-forming agent Polyacrylate-13 2.160 4 emulsifier Polysorbate 20 0.180 5 emulsifier Sorbitan isostearate 0.144 6 pH adjuster Citric acid 0.250 7 oil Polyisobutene 　0.008 8 oil Cetylethylhexanoate 1.000 9 antiseptic 1,2-hexanediol 0.175 10 antiseptic Butylene glycol 0.175 11 antiseptic Caprylyl glycol 0.146 12 antiseptic Star anise extract 0.005 13 moisturizer glycerin 2.000 14 incense spices 0.100

[0069] Example 4: Preparation of a hair dyeing composition

[0070] Gray hair care hair essences were prepared according to the compositions of Tables 7 and 8 below, respectively.

[0071] Gray Hair Care Hair Essence Part 1 　 division Ingredient Name Content (weight%) 1 purified water purified water To 100 2 antioxidants gallic acid 2.600 3 extract Complex extract of Centella asiatica and Chaga mushroom (Preparation Example 1) 10.000 4 antioxidants tannic acid 0.05 5 Film-forming agent Polyacrylate-13 0.780 6 emulsifier Polysorbate 20 0.065 7 emulsifier Sorbitan isostearate 0.052 8 pH adjuster Citric acid 0.020 9 oil Polyisobutene 0.364 10 oil Cetylethylhexanoate 1.000 11 antiseptic 1,2-hexanediol 0.175 12 antiseptic Butylene glycol 0.175 13 antiseptic Caprylyl glycol 0.146 14 antiseptic Star anise extract 0.005 15 moisturizer glycerin 2.000 16 incense spices 0.100

[0073] Gray Hair Care Hair Essence Part 2 　 division Ingredient Name Content (weight%) 1 purified water purified water To 100 2 Inorganic salts Silver sulfate 0.400 3 Film-forming agent Polyacrylate-13 2.160 4 emulsifier Polysorbate 20 0.180 5 emulsifier Sorbitan isostearate 0.144 6 pH adjuster Citric acid 0.250 7 oil Polyisobutene 　0.008 8 oil Cetylethylhexanoate 1.000 9 antiseptic 1,2-hexanediol 0.175 10 antiseptic Butylene glycol 0.175 11 antiseptic Caprylyl glycol 0.146 12 antiseptic Star anise extract 0.005 13 moisturizer glycerin 2.000 14 incense spices 0.100

[0075] Comparative Example 1: Preparation of a hair dyeing composition

[0076] Gray hair care essences containing oxidative dyes were prepared according to the compositions of Tables 9 and 10 below, respectively.

[0077] Oxidative hair dye Part 1 　 division Ingredient Name Content (weight%) 1 purified water purified water To 100 2　　 Oxidative dye p-phenylenediamine 1.450 Oxidative dye m-aminophenol 0.650 Oxidative dye Resorcinol 0.500 3 emulsifier Polyacrylate-13 0.780 4 emulsifier Polysorbate 20 0.065 5 emulsifier Sorbitan isostearate 0.052 6 pH adjuster ethanolamine 5.000 7 oil Polyisobutene 0.364 8 oil Cetylethylhexanoate 1.000 9 antiseptic 1,2-hexanediol 0.175 10 antiseptic Butylene glycol 0.175 11 antiseptic Caprylyl glycol 0.146 12 antiseptic Star anise extract 0.005 13 moisturizer glycerin 2.000 14 incense spices 0.100

[0079] Oxidative hair dye Part 2 　 division Ingredient Name Content (weight%) 1 purified water purified water To 100 2 Oxidizing agent hydrogen peroxide 6.000 3 emulsifier Polyacrylate-13 2.160 4 emulsifier Polysorbate 20 0.180 5 emulsifier Sorbitan isostearate 0.144 6 pH adjuster Citric acid 0.250 7 oil Polyisobutene 　 8 oil Cetylethylhexanoate 1.008 9 antiseptic 1,2-hexanediol 0.175 10 antiseptic Butylene glycol 0.175 11 antiseptic Caprylyl glycol 0.146 12 antiseptic Star anise extract 0.005 13 moisturizer glycerin 2.000 14 incense spices 0.100

[0081] Test Example 1: Damage Test on Dyed Hair

[0082] A bleached human hair sample taken from the same person, with a length of 10 cm and a bundle cross-sectional diameter of 1 cm, was prepared. Equal amounts of 10 g of Part 1 and 10 g of Part 2 of the gray hair care hair essence prepared according to the above example were weighed and mixed, then dyed for 30 minutes, washed, and dried. Additionally, equal amounts of 10 g of Part 1 and 10 g of Part 2 of the oxidative hair dye prepared according to the above comparative example were weighed and mixed, then dyed for 30 minutes, washed, and dried. After the initial use, dyeing was repeated 5 times daily. The color development and hair damage of the example and comparative example were compared and are shown in Table 11.

[0083] Hair damage 1 time 2nd time 3 times 4th time 5th time Example 1 - - - * * Example 2 - - - * * Example 3 - - - - - Example 4 - - - - - Comparative Example 1 ** *** *** *** ***

[0084] (Hair damage level - rated as very severe(***) to good(-))

[0085] As confirmed in Table 11 above, the hair essences of Examples 1 and 2, prepared by adding only plant-based polyphenols to the first agent, caused very little damage to the hair. The hair essences of Examples 3 and 4, which contained a complex extract of Centella asiatica and Chaga mushroom along with plant-based polyphenols in the first agent, caused no damage to the cuticles at all, so the hair remained soft and smooth on the surface even after treatment, indicating that the complex extract of Centella asiatica and Chaga mushroom helps to inhibit hair damage.

[0086] It was found that the oxidative hair dye of Comparative Example 1 damaged the cuticle, causing the hair to become brittle and rough after treatment.

[0088] Test Example 2: Scalp Damage Test After Dyeing

[0089] On the skin and scalp of the same person, equal amounts of 10g of Part 1 and 10g of Part 2 of the gray hair care hair essence prepared according to Examples 1, 2, 3, and 4 were measured and mixed, left for 30 minutes, washed, and dried. In addition, equal amounts of 10g of Part 1 and 10g of Part 2 of the oxidative hair dye prepared according to Comparative Example 1 were measured and mixed, left for 30 minutes, washed, and dried (Fig. 4). The treatment was repeated 5 times daily after the initial use.

[0090] The degree of scalp damage of the examples and comparative examples was evaluated by observing the occurrence of rashes and allergic phenomena, and the results are shown in Table 12.

[0091] Scalp damage 1 time 2nd time 3 times 4th time 5th time Example 1 - - - - * Example 2 - - - - * Example 3 - - - - - Example 4 - - - - - Comparative Example 1 ** *** *** *** ***

[0092] (Scalp damage level - rated as very severe(***) to good(-))

[0093] As confirmed in Table 12, when the hair essence of the example containing plant-based polyphenols and silver sulfate was used, there was no irritation to the scalp at all, and there were almost no rashes or allergic reactions on the scalp even after treatment. In particular, when the hair essence of Example 3 and Example 4, which further contained a complex extract of Centella asiatica and Chaga mushroom, was used, there was no irritation to the scalp at all, and no rashes or allergic reactions appeared on the scalp even after treatment. Through this, it can be seen that the complex extract of Centella asiatica and Chaga mushroom helps to suppress scalp irritation.

[0094] It can be seen that when using the oxidative hair dye of Comparative Example 1, irritation to the scalp is present, and as the treatment progresses, itching, rash, and allergic symptoms worsen.

[0096] Test Example 3: Dyeing Experiment of Bleached Hair

[0097] A bleached human hair sample taken from the same person, with a length of 10 cm and a bundle cross-sectional diameter of 1 cm, was prepared. Equal amounts of 10 g of Part 1 and 10 g of Part 2 of the hair essence prepared according to the above example were weighed and mixed, then dyed for 30 minutes, washed, and dried. Additionally, equal amounts of 10 g of Part 1 and 10 g of Part 2 of the oxidative hair dye prepared according to the comparative example were weighed and mixed, then dyed for 30 minutes, washed, and dried. After the initial use, dyeing was repeated 5 times daily. Color development was compared and is shown in Table 13 and Figure 1.

[0098] Color development 1 time 2nd time 3 times 4th time 5th time Example 1 △ △ ○ ○ ◎ Example 2 △ ○ ○ ◎ ◎ Example 3 ○ ○ ○ ◎ ◎ Example 4 ○ ◎ ◎ ◎ ◎ Comparative Example 1 ○ ◎ ◎ ◎ ◎

[0099] (Color development evaluation - Excellent: ◎, Good: ○, Average: △, Poor: X, Very poor: XX)

[0100] As can be seen in Table 13 and Figure 1, when using the hair essences of Examples 1 and 2, which contain only plant-based polyphenols in the first agent, the color development was weak, but when using the hair essences of Examples 3 and 4, which contain a complex extract of Centella asiatica and Chaga mushroom together in the first agent, excellent color development was shown, and in the case of Example 4, excellent color development was shown to the same degree as the oxidative hair dye of Comparative Example 1.

[0102] Test Example 4: Immediate Gray Hair Coverage Test

[0103] The immediate color development of the gray hair care hair essences of Examples 1 to 4 above was evaluated to confirm the gray hair coverage ability. 10g each of the first agent and the second agent were weighed and mixed, and the color development was evaluated after 2 minutes. The results are shown in Figure 2.

[0104] As shown in Figure 2, it was confirmed that excellent color development was exhibited after 2 minutes of mixing.

[0106] Test Example 5: Gray Hair Coverage Test

[0107] 10g of the first component and 10g of the second component of the hair essence prepared according to the above example were weighed and mixed, then applied to an area with gray hair and dried. After 24 hours, a photograph was taken to compare the degree of improvement. The results are shown in Fig. 3.

[0108] As confirmed in Figure 3, when using a hair essence containing a complex extract of Centella asiatica and Chaga mushroom and plant-based polyphenols in the first agent, superior dyeing power was exhibited.

Claims

Claim 1 A cosmetic composition for hair dyeing comprising a complex extract of Centella asiatica and Chaga mushroom prepared by mixing Centella asiatica and Chaga mushroom in a weight ratio of 1 to 3:1 to 3, a first agent containing plant-derived polyphenols, and a second agent containing silver sulfate, wherein the plant-derived polyphenols are gallic acid and tannic acid, the pH of the first agent is 3.0-6.0, and the pH of the second agent is 2.5-5.

0. Claim 2 delete Claim 3 A cosmetic composition for hair dyeing according to claim 1, characterized in that the first component further contains at least one selected from the group consisting of eggplant fruit extract, persimmon extract, guava leaf extract, strawberry extract, blackberry extract, raspberry extract, quince extract, chestnut extract, black cumin seed extract, blueberry extract, salvia leaf extract, shea butter extract, lotus leaf extract, cucumber root extract, quinoa seed extract, grape extract, white willow extract, feverfew extract, bamboo extract, acorn extract, and Cornus fruit extract. Claim 4 delete Claim 5 A cosmetic composition for hair dyeing according to claim 1, characterized in that the complex extract of Centella asiatica and Chaga mushroom is contained in a ratio of 5 to 20 weight percent based on the total weight of the first agent. Claim 6 A cosmetic composition for hair dyeing according to claim 1, characterized in that the first and second agents further contain polyacrylate, a surfactant, a pH adjuster, an additive, a preservative, and a fragrance. Claim 7 A cosmetic composition for hair dyeing according to claim 1, characterized in that the silver sulfate is contained in a ratio of 0.01 to 10.0 weight% with respect to the total weight of the second agent. Claim 8 delete Claim 9 A cosmetic composition for dyeing hair according to claim 1, characterized in that the above-mentioned cosmetic composition for dyeing hair is for covering gray hair.

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