Multi-component hair dye and hair dyeing method using the same

Abstract

To provide a multi-component hair dye which can enhance hair dyeing power without continuous use, can suppress damage to hair, has strong resistance to washing, and excels in preventing fading, even when using direct dyes such as HC dyes and basic dyes which are considered to remain in the outer layer and surface of hair, and a hair dyeing method using the same. [Solution] This multi-component hair dye is composed of an introduction treatment agent containing 0.5 to 8.0% by weight of a reducing agent to be applied to the hair, a hair dye containing a basic dye, an HC dye, an oil, a surfactant, and a moisturizer to be applied to the hair, and a finishing treatment agent containing 0.5% by weight or more of an oxidizing agent to be applied to the hair.

Description

[Technical Field]

[0001] The present invention relates to a multi-component hair dye using a direct dye such as an HC dye or a basic dye, and a hair dyeing method using the same. [Background technology]

[0002] Hair coloring agents can be broadly divided into two types: oxidative hair dyes, also known as permanent hair dyes, and semi-permanent hair dyes. Oxidative hair dyes use an alkaline agent to open the cuticle, the outermost layer of the hair, allowing the oxidative dye to penetrate into the cortex inside the hair, while the oxidizing agent breaks down the melanin pigment present in the cortex, allowing the oxidative dye to develop color in the hair.

[0003] On the other hand, hair dyes are dyed by direct dyes such as HC dyes and basic dyes that penetrate or adsorb into the hair. The former, HC dyes, have small molecules that penetrate into the gaps in the cuticle on the surface of the hair, penetrating and fixing to the surface of the hair. The latter, basic dyes, bind to the negative ions in the hair and dye the hair by adsorbing to the surface of the hair.

[0004] Hair dyeing with such direct dyes dyes the outer layer and surface of the hair, which has the advantage of causing less damage to the hair compared to oxidative hair dyes that dye the deeper layers of the hair. On the other hand, hair dyes tend to have weak dyeing power, are relatively ineffective in terms of color durability and color retention, and are less resistant to washing with shampoos and the like.

[0005] Conventional techniques for improving the weak dyeing power of hair dyes are disclosed in Patent Document 1 and Patent Document 2. Patent Document 1 discloses a hair dye that is said to have improved dyeing power and wash resistance by cleaving disulfide bonds in the hair with a specific reducing agent and promoting diffusion of the dye deep into the hair. Patent Document 2 also discloses a hair dye that contains a specific reducing agent with weak reducing power, such as thioglycolic acid, and a specific basic dye in a certain ratio, which does not cause cleavage of disulfide bonds and is said to have high dye accumulation in hair after continuous use. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2015-166378 [Patent Document 2] Patent Publication No. 2022-018304 Summary of the Invention [Problem to be solved by the invention]

[0007] The object of the present invention is to provide a multi-component hair dye that can increase hair dyeing power without continuous use, while using direct dyes such as HC dyes and basic dyes, which are thought to remain in the outer layer and surface of the hair, and that can reduce damage to the hair, and that is highly resistant to washing and excellent at preventing fading, as well as a hair dyeing method using the same. [Means for solving the problem]

[0008] After extensive investigations, the inventors focused on the disulfide bonds in hair, particularly the disulfide bonds between the scale-like overlapping cuticles, and on the effect that the dissociation and recombination of these disulfide bonds have on the dyeing power of direct dyes, leading to the invention of the present invention.

[0009] That is, the present invention is a multi-component hair dye for dyeing hair, which is composed of an introduction treatment agent that contains 0.5 to 8.0% by weight of a reducing agent and is applied to the hair, a hair dye that contains a basic dye, an HC dye, an oil, a surfactant, and a moisturizer and is applied to the hair, and a finishing treatment agent that contains 0.5% by weight or more of an oxidizing agent and is applied to the hair.

[0010] In addition, the hair dyeing method using the multi-component hair dye of the present invention includes the steps of applying the introduction treatment agent to the hair and leaving it to stand, applying the hair dye to the hair and leaving it to stand, and then rinsing with water, and applying the finishing treatment agent to the hair and leaving it to stand, and then rinsing with water. [Effects of the Invention]

[0011] According to the multi-component hair dye of the present invention, when the introduction treatment agent is applied to hair, the reducing agent contained in the introduction treatment agent dissociates disulfide bonds in the hair, particularly those between the cuticles that overlap like scales on the surface of the hair, allowing the direct dyes contained in the hair dye, such as HC dyes and basic dyes, to penetrate deep into the gaps in the cuticle and further promote penetration into the surface layer of the cortex located inside the cuticle. This improves hair dyeing power. Furthermore, the oxidizing agent contained in the finishing treatment agent reconstructs disulfide bonds, preventing the direct dyes that have penetrated deep into the gaps in the cuticle from leaking out, effectively suppressing fading due to washing, such as washing the hair.

[0012] On the other hand, the present invention contains a reducing agent in the introduction treatment agent and an oxidizing agent in the finishing treatment agent with the aim of strengthening the hair dyeing power, but since it is intended to dissociate and recombine disulfide bonds between the cuticles that are layered like scales on the surface of the hair, the concentrations of these reducing agents and oxidizing agents can be lower than those of perm agents, which must penetrate deep into the hair, making it possible to reduce damage to the hair while increasing the hair dyeing power. DETAILED DESCRIPTION OF THE INVENTION

[0013] The multi-component hair dye of the present invention and the hair dyeing method using the same will be described in detail below.

[0014] First, the multi-component hair dye of the present invention is composed of an introduction treatment agent as the first agent, a hair dye agent as the second agent, and a finishing treatment agent as the third agent. By applying these to the hair in this order, the penetration of the direct dye contained in the second agent into the interior of the hair can be promoted, thereby increasing the hair dyeing power.

[0015] Among direct dyes, dyes with relatively small molecular weights, such as HC dyes, penetrate into the gaps in the cuticle, which is the scale-like layer that forms the epidermis of the hair, and adhere to the hair, thereby coloring it. However, dyes that easily penetrate into the gaps in the cuticle tend to easily flow out of the gaps when washed with shampoo, etc., resulting in weak dyeing power and a short-lasting dyeing effect.

[0016] Here, the overlapping cuticles, like scales, are bonded together by a cell membrane complex (CMC), and disulfide bonds exist within this CMC. The multi-component hair dye of the present invention focuses on the disulfide bonds in this region, dissociating the disulfide bonds with the introduction treatment agent, weakening the adhesion between the cuticles and allowing the direct dye contained in the hair dye to penetrate deep into the gaps in the cuticles. Furthermore, after dyeing with the direct dye, the dissociated disulfide bonds are rebonded with the finishing treatment agent, thereby preventing the direct dye that has penetrated into the gaps in the cuticles from leaking out, improving the dyeing power and prolonging the dyeing effect.

[0017] The introduction treatment agent contains a reducing agent for dissociating disulfide bonds in hair in water as a solvent, and examples of the reducing agent that can be used include thioglycolates, sulfites, sodium thiosulfate, cysteine ​​or its salts, acetylcysteine, cysteamine or its salts, and butyrolactone thiol.

[0018] The content of the reducing agent is 0.5 to 8.0 wt. % of the total amount of the introduction treatment agent, preferably 2.0 to 6.0 wt. As shown in the experimental results described below, when the content of the reducing agent is less than 0.5 wt. %, the hair dyeing effect is reduced. This is thought to be because the amount of disulfide bonds present in the gaps of the cuticle is reduced, preventing the direct dye, such as the HC dye, contained in the hair dye from penetrating deeply into the gaps of the cuticle, which are like overlapping scales. Furthermore, when the content of the reducing agent exceeds 8.0 wt. %, hair damage becomes significant, resulting in increased breakage and split ends after dyeing. This is thought to be due to the reducing agent acting on the cortex present inside the cuticle, causing hair damage.

[0019] The introduction treatment agent contains sodium hydroxide as a pH adjuster and is adjusted to an alkaline pH of 7.0 to 10.0. By maintaining the pH of the introduction treatment agent at this value, the hair is softened and swelled, thereby facilitating the penetration of the reducing agent into the hair. Examples of pH adjusters that can be used include potassium hydroxide, ammonia, triethanolamine, diethanolamine, monoethanolamine, carbonates, bicarbonates, arginine, and aminomethylpropanol.

[0020] The introduction treatment agent may be an amphoteric surfactant for the purposes of foaming, conditioning, penetration promotion, and emulsification, such as cocamidopropyl betaine, lauramidopropyl betaine, sodium cocoamphoacetate, sodium lauroamphoacetate, disodium cocoamphodiacetate, myristamidopropyl betaine, palm kernel fatty acid amidopropyl betaine, lauryl betaine, cocobetaine, lauryl hydroxysultaine, and lauramidopropyl hydroxysultaine, or anionic surfactants, such as carboxylates, alkyl ether carboxylates, alkyl sulfates, alkyl ether sulfates, acyl isethionates, alkyl sulfonates, and acyl peptide salts. These surfactants include α-olefin sulfonates, acyl sarcosine salts, acyl methyl alanine salts, acyl glutamates, acylaspartates, acyl glycine salts, acylalanine salts, acyl methyl taurine salts, and acyl lactates; cationic surfactants such as quaternary ammonium salts, tertiary ammonium salts, imidazolinium salts, pyridinium salts, and benzyl ammonium salts; and nonionic surfactants such as polyoxyethylene surfactants, glycerin derivatives, sorbitan fatty acid esters, sucrose fatty acid esters, fatty acid alkanolamides, alkyl glucosides, and propylene glycol derivatives.

[0021] Furthermore, the introduction treatment agent contains polyhydric alcohols such as propylene glycol, butylene glycol, dipropylene glycol, pentylene glycol, ethylhexylglycerin, and glycerin, and alcohols such as ethanol and benzyl alcohol, for the purposes of conditioning and penetration promotion. Furthermore, it contains urea for the purposes of conditioning and penetration promotion. Furthermore, it contains polyquaternium-10, cationized guar gum, cationized cellulose, xanthan gum, hydroxyethyl cellulose, and carbomer for the purposes of conditioning and thickening.

[0022] Furthermore, the introduction treatment agent contains as an oil agent higher alcohols such as cetyl alcohol, stearyl alcohol, behenyl alcohol, lauryl alcohol, myristyl alcohol, and oleyl alcohol; fatty acids such as lauric acid, myristic acid, palmitic acid, and stearic acid; mineral oils such as liquid paraffin, squalene, and isododecane; waxes such as carnauba wax, candelilla wax, beeswax (beeswax), microcrystalline wax, and paraffin; and ester oils such as isopropyl palmitate, cetyl ethylhexanoate, coconut (caprylate / caprate), octyldodecyl myristate, and isopropyl myristate.

[0023] Furthermore, the introduction treatment agent may be used for conditioning and hair repair purposes with vegetable oils such as olive oil, jojoba oil, almond oil, macadamia nut oil, coconut oil, argan oil, shea butter, cocoa butter, camellia oil, safflower oil, sesame oil, rosehip oil, avocado oil, grape seed oil, sunflower oil, peanut oil, rice bran oil, baobab oil, moringa oil, palm oil, camellia oil, kukui nut oil, hazelnut oil, castor oil (castor oil), evening primrose oil, blackcurrant oil, echinacea oil, apricot kernel oil, mongongo oil, Brazil nut oil, pistachio oil, passion fruit seed oil, kalanga oil, sesame oil, and the like. These may contain: olive oil, autumn olive oil, rosemary oil, babassu oil, moringa oil, candelilla oil, prune seed oil, papaya seed oil, kiwi seed oil, pineapple seed oil, lotus seed oil, mango butter, pistachio seed oil, cottonseed oil, chia seed oil, acai oil, guava seed oil, flaxseed oil, karanja oil, perilla seed oil, apricot kernel oil, meadowfoam oil, chamomile seed oil, black seed oil, pumpkin seed oil, animal oils such as lanolin, mink oil, squalane, horse oil, mutton tallow, fish oil, and plant extracts. For hair repair purposes, they may also contain hydrolyzed keratin, hydrolyzed collagen, ceramide, and hyaluronic acid.

[0024] The above-described components can be selected as desired depending on the dosage form of the introduction treatment agent, such as cream, emulsion, foam, etc.

[0025] Next, the hair dye will be described. This hair dye is applied to hair after the required time has elapsed since the application of the introduction treatment agent, and is used for the purpose of allowing an HC dye or a basic dye as a direct dye to penetrate the hair and dye the hair. The hair dye is basically applied to hair after the application of the introduction treatment agent, but it may also be applied to hair in a state where it is mixed with the introduction treatment agent. However, if the hair dye is applied in a mixed state, there is a concern that the concentration of the direct dye will be diluted by the moisture in the introduction treatment agent, resulting in a decrease in the hair dyeing effect.

[0026] The dye contained in the hair dye may be any combination of HC dyes such as HC Blue 2, HC Blue 16, HC Blue 15, HC Yellow 4, HC Yellow 2, and HC Red 3, and basic dyes such as Basic Brown 16, Basic Brown 17, Basic Blue 99, Basic Yellow 57, Basic Yellow 87, Basic Orange 31, Basic Blue 124, Basic Blue 75, Basic Red 51, Basic Red 76, and Basic Purple 2. The dye is mixed with water, a surfactant, an oil, etc., and the formulation is a cream.

[0027] The hair dye is adjusted to an alkaline pH of 7.0 to 10.0 using a pH adjuster such as ammonium carbonate, which allows the hair to swell with the introduction treatment agent, maintaining an open cuticle, and facilitating the penetration of the dye in the hair dye into the inside of the cuticle.

[0028] Furthermore, the hair dye contains a cationic surfactant, which neutralizes negatively charged static electricity in hair due to its weak alkalinity, thereby suppressing dryness of the hair. Examples of the cationic surfactant include steartrimonium chloride, behentrimonium chloride, and stearamidopropyldimethylamine.

[0029] Furthermore, the hair dye may contain hair repair ingredients such as hydrolyzed keratin and hydrolyzed collagen, moisturizing ingredients such as glycerin, etc., in order to care for hair damaged by the reducing agent contained in the introduction treatment agent, and may also contain fragrances.

[0030] Next, the finishing agent will be described. This finishing agent is applied to hair that has been dyed with the hair dye, with the aim of enhancing the durability of the hair dyeing effect. The durability of the hair dyeing effect after hair dyeing by the method of the present invention varies depending on whether or not this finishing agent is applied.

[0031] The finishing agent is a cream base containing an oxidizing agent for the purpose of recombining disulfide bonds in the hair, and examples of the oxidizing agent that can be used include potassium bromate, sodium bromate, sodium perborate, sodium percarbonate, and hydrogen peroxide.

[0032] The content of the oxidizing agent is 0.5 wt % or more, preferably 1.5 to 3.5 wt %, based on the total amount of the finishing agent. As will be shown in the experimental results described below, when the oxidizing agent content is less than 0.5 wt %, differences in color durability occur when the finishing agent is applied to hair and then washed with shampoo. This is thought to be because the disulfide bonds within the CMC that bond the cuticles together do not recombine sufficiently, causing the dye that has entered the gaps in the cuticle to be washed out by washing.

[0033] Furthermore, the concentration of the oxidizing agent contained in the finishing treatment agent is preferably 25 to 50% of the concentration of the reducing agent contained in the introduction treatment agent. As will be shown in the experimental results described below, if the concentration of the oxidizing agent relative to the reducing agent is less than 25%, the disulfide bonds inside the CMC that were dissociated by the reducing agent are not sufficiently recombined, and the ability to retain the dye that has penetrated into the gaps in the cuticle is thought to be reduced. On the other hand, if the concentration of the oxidizing agent relative to the reducing agent exceeds 50%, the hair dyeing effect is maintained to a certain extent, but the oxidizing agent becomes excessive compared to the reducing agent, and the oxidizing agent damages the hair, resulting in a decrease in the hair dyeing effect.

[0034] The finishing agent may contain iodized garlic extract for the purposes of activating hair papilla cells and epidermal keratinocytes and protecting the scalp from oxidizing agents.

[0035] The finishing agent may contain amphoteric surfactants for the purposes of foaming, conditioning, penetration promotion, and emulsification, such as cocamidopropyl betaine, lauramidopropyl betaine, sodium cocoamphoacetate, sodium lauroamphoacetate, disodium cocoamphodiacetate, myristamidopropyl betaine, palm kernel fatty acid amidopropyl betaine, lauryl betaine, cocobetaine, lauryl hydroxysultaine, and lauramidopropyl hydroxysultaine, or anionic surfactants, such as carboxylates, alkyl ether carboxylates, alkyl sulfates, alkyl ether sulfates, acyl isethionates, alkyl sulfonates, and acyl peptide salts. These surfactants include α-olefin sulfonates, acyl sarcosine salts, acyl methyl alanine salts, acyl glutamates, acylaspartates, acyl glycine salts, acylalanine salts, acyl methyl taurine salts, and acyl lactates; cationic surfactants such as quaternary ammonium salts, tertiary ammonium salts, imidazolinium salts, pyridinium salts, and benzyl ammonium salts; and nonionic surfactants such as polyoxyethylene surfactants, glycerin derivatives, sorbitan fatty acid esters, sucrose fatty acid esters, fatty acid alkanolamides, alkyl glucosides, and propylene glycol derivatives.

[0036] Furthermore, for the purposes of conditioning and penetration promotion, it contains polyhydric alcohols such as propylene glycol, butylene glycol, dipropylene glycol, pentylene glycol, ethylhexylglycerin, and glycerin, and alcohols such as ethanol and benzyl alcohol, and also contains polyquaternium-10, cationized guar gum, cationized cellulose, xanthan gum, hydroxyethyl cellulose, and carbomer for the purposes of conditioning and thickening. Oils include higher alcohols such as cetyl alcohol, stearyl alcohol, behenyl alcohol, lauryl alcohol, myristyl alcohol, and oleyl alcohol; fatty acids such as lauric acid, myristic acid, palmitic acid, and stearic acid; mineral oils such as liquid paraffin, squalene, and isododecane; waxes such as carnauba wax, candelilla wax, beeswax (beeswax), microcrystalline wax, and paraffin; and ester oils such as isopropyl palmitate, cetyl ethylhexanoate, coconut (caprylate / caprate), octyldodecyl myristate, and isopropyl myristate.

[0037] Furthermore, the finishing agent may contain, for the purpose of conditioning and repairing hair, vegetable oils such as olive oil, jojoba oil, almond oil, macadamia nut oil, coconut oil, argan oil, shea butter, cocoa butter, camellia oil, safflower oil, sesame oil, rosehip oil, avocado oil, grape seed oil, sunflower oil, peanut oil, rice bran oil, baobab oil, moringa oil, palm oil, camellia oil, kukui nut oil, hazelnut oil, castor oil (castor oil), evening primrose oil, blackcurrant oil, echinacea oil, apricot kernel oil, mongongo oil, Brazil nut oil, pistachio oil, passion fruit seed oil, kalanga oil, sesame oil, and the like. These may contain: celery oil, autumn olive oil, rosemary oil, babassu oil, moringa oil, candelilla oil, prune seed oil, papaya seed oil, kiwi seed oil, pineapple seed oil, lotus seed oil, mango butter, pistachio seed oil, cottonseed oil, chia seed oil, acai oil, guava seed oil, flaxseed oil, karanja oil, perilla seed oil, apricot kernel oil, meadowfoam oil, chamomile seed oil, black seed oil, pumpkin seed oil, animal oils such as lanolin, mink oil, squalane, horse oil, mutton tallow, fish oil, and plant extracts. For hair repair purposes, they may also contain hydrolyzed keratin, hydrolyzed collagen, ceramide, and hyaluronic acid.

[0038] The above-described components can be selected as desired depending on the formulation of the finishing agent, such as cream, emulsion, foam, etc.

[0039] The finishing agent contains a pH adjuster such as phosphoric acid, citric acid, lactic acid, glyoxylic acid, levulinic acid, maleic acid, or fumaric acid, and is adjusted to a weak acidity of pH 3.0 to 7.0. Maintaining the finishing agent at such a pH value closes the hair cuticle, enhancing the retention of the dye, hair repair ingredients, moisturizing ingredients, and the like.

[0040] Next, the results of experiments confirming the effectiveness of the method of the present invention will be described.

[0041] [Experiment 1] In this experiment, several different concentrations of the reducing agent were prepared, and a hair bundle was treated with the introduction treatment, hair dye, and finishing treatment in that order to confirm the difference in hair dyeing effect and the degree of damage to the hair at each concentration of the reducing agent. Bleached human hair bundles (manufactured by Osaka Brush Co., Ltd. / product name: Bleach Hair L Brown) were used as the hair bundles.

[0042] The experimental procedure is shown below, and the experimental results are shown in Table 1. 1. Immerse the hair bundle in an introduction treatment agent containing ammonium thioglycolate as a reducing agent, and leave it at 40°C for 15 minutes. 2 After removing the hair strands from the treatment, wipe off the moisture with kitchen paper. 3 Apply the hair dye to the hair bundle and leave it at 40°C for 15 minutes. 4 Rinse the hair strands with water. 5. The hair bundle is immersed in a finishing treatment agent containing 1.5% by weight of sodium bromate as an oxidizing agent, and left to stand at 40°C for 15 minutes. 6 After rinsing the hair strands with water, let them dry naturally. 7 Visually check the dyeing effect on the naturally dried hair strands and rate it on a 5-point scale. 8. Comb the hair bundle 30 times using a comb and measure the weight of the broken hair.

[0043] [Table 1]

[0044] As can be seen from the results of this experiment, a hair dyeing effect was obtained when the reducing agent concentration was 0.5% by weight or more, and particularly good hair dyeing effects were obtained when the reducing agent concentration was 2.0 to 6.0% by weight. It was also confirmed that when the reducing agent concentration exceeded 6.0% by weight, hair breakage increased when combing with a comb, causing significant damage to the hair.

[0045] [Experiment 2] In this experiment, multiple finishing treatment agents with different oxidizing agent concentrations were prepared, and a hair strand was actually treated with the introduction treatment agent, hair dye, and finishing treatment agent in that order, and then the hair strand was washed with shampoo to confirm the difference in color durability at each oxidizing agent concentration. In addition, to examine the relationship between the concentration of the reducing agent contained in the introduction treatment agent and the concentration of the oxidizing agent contained in the finishing treatment agent, experiments were conducted for two types of introduction treatment agents with different concentrations of ammonium thioglycolate as the reducing agent. The hair strands used were the same as in Experiment 1.

[0046] The experimental procedure is shown below, and the experimental results are shown in Table 2 (thioglycolic acid concentration: 2.0 wt %) and Table 3 (thioglycolic acid concentration: 6.0 wt %). 1. Immerse the hair bundle in an introduction treatment agent containing ammonium thioglycolate as a reducing agent, and leave it at 40°C for 15 minutes. 2 After removing the hair strands from the treatment, wipe off the moisture with kitchen paper. 3 Apply the hair dye to the hair bundle and leave it at 40°C for 15 minutes. 4 Rinse the hair strands with water. 5. Immerse the hair strand in a finishing treatment agent containing sodium bromate as an oxidizing agent and leave it at 40°C for 15 minutes. 6 Wash the hair bundle five times using shampoo, then dry it with a hair dryer. 7 Visually check the dyeing effect on the dried hair strand and rate it on a 5-point scale.

[0047] [Table 2]

[0048] [Table 3]

[0049] As can be seen from the results of this experiment, when the concentration of the oxidizing agent contained in the finishing treatment agent is 0.5 wt% or more, a certain degree of color retention effect can be obtained, and it was also confirmed that the finishing treatment agent is resistant to washing with shampoo. Furthermore, as shown in Table 2, when the reducing agent concentration is 2.0 wt%, when the oxidizing agent concentration exceeds 1.0 wt%, the color retention effect is slightly impaired. When the hair bundles were inspected after the experiment, it was determined that this was because the oxidizing agent concentration was excessive compared to the reducing agent concentration, and damage to the hair was accelerated by the action of the oxidizing agent.

[0050] Furthermore, it was confirmed that the concentration of the oxidizing agent that can maximize the color retention effect varies depending on the concentration of the reducing agent in the introduction treatment agent, and these experimental results showed that the color retention effect of the multi-component hair dye of the present invention can be maximized when the concentration of the oxidizing agent contained in the finishing treatment agent is 25% or more of the concentration of the reducing agent contained in the introduction treatment agent. However, it was also found that when the concentration of the oxidizing agent exceeds 50% of the concentration of the reducing agent, the action of the oxidizing agent accelerates hair damage, and the color retention effect is actually impaired.

[0051] As explained above, the multi-component hair dye of the present invention uses direct dyes such as HC dyes and basic dyes, which are thought to remain on the surface of the hair, but still exhibits high dyeing power, making it possible to obtain a high hair dyeing effect with just one use, and is also highly resistant to washing, making it possible to maintain the hair dyeing effect and prevent fading even after repeated washing.In addition, since a high hair dyeing effect can be obtained using direct dyes while suppressing the concentrations of reducing agents that dissociate disulfide bonds and oxidizing agents that recombine them, it is possible to dye hair while minimizing damage to the hair.

Claims

1. A multi-component hair dye for dyeing hair, an introduction treatment agent to be applied to hair, the introduction treatment agent containing 0.5 to 4.0 wt % of thioglycolates as a reducing agent; a hair dye containing a basic dye, an HC dye, an oil, a surfactant, and a moisturizer, and to be applied to hair; a finishing treatment agent to be applied to hair, the finishing treatment agent containing 0.5 to 2.5% by weight of potassium bromate or sodium bromate as an oxidizing agent; A multi-component hair dye characterized by comprising:

2. 2. The multi-component hair dye according to claim 1, wherein the concentration of the reducing agent in the introduction treatment agent is 2.0% by weight.

3. 2. The multi-component hair dye according to claim 1, wherein the concentration of the oxidizing agent in the finishing treatment agent is 0.5 to 1.0% by weight.

4. 2. The multi-component hair dye according to claim 1, wherein the concentration of the oxidizing agent contained in the finishing treatment agent is 25 to 50% of the concentration of the reducing agent contained in the introduction treatment agent.

5. A hair dyeing method using the multi-component hair dye according to claim 1, A step of applying the introduction treatment agent to hair and leaving it to stand; A step of applying the hair dye to hair, leaving it to stand, and then rinsing with water; applying the finishing treatment agent to the hair and leaving it to stand, and then rinsing with water.

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