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

Abstract

This invention provides a multi-component hair dye and a hair dyeing method using the same, which allows for enhanced dyeing power without repeated use, while using direct dyes such as HC dyes and basic dyes that are thought to remain on the surface and outer layer of the hair, and also minimizes hair damage, has strong resistance to washing, and is excellent at preventing fading. [Solution] A multi-component hair dye for coloring hair, comprising: an introductory treatment agent containing 0.5 to 8.0% by weight of a reducing agent and applied to the hair; a hair dye containing a basic dye, an HC dye, an oil, a surfactant, and a moisturizer and applied to the hair; and a finishing treatment agent containing 0.5% by weight or more of an oxidizing agent and applied to the hair.

Description

Technical Field

[0001] The present invention relates to a multi-agent hair dyeing material using direct dyes such as HC dyes and basic dyes, and a hair dyeing method using the same.

Background Art

[0002] Hair coloring agents are roughly divided into oxidative hair dyes called permanent hair dyes and hair dyeing materials called semi-permanent hair dyes. Oxidative hair dyes open the cuticle located on the outermost side of the hair by the action of an alkaline agent, penetrate the oxidative dye into the cortex inside the hair, decompose the melanin pigment present in the cortex by the action of an oxidizing agent, and color the hair by the development of color of the oxidative dye.

[0003] On the other hand, hair dyeing materials are those in which direct dyes such as HC dyes and basic dyes penetrate or adsorb onto the hair to dye the hair. Since the former HC dye has a small molecule, it enters the gaps of the cuticle on the hair surface, penetrates into the surface layer portion of the hair, and fixes. The latter basic dye binds to the negative ions of the hair and dyes the hair by adsorbing onto the surface of the hair.

[0004] In hair dyeing with such direct dyes, since the surface layer portion and the surface of the hair are dyed, there is an advantage that damage to the hair can be suppressed as compared with oxidative hair dyes that dye the deep part of the hair. On the other hand, hair dyeing materials have weak hair dyeing power, relatively weak effects in terms of color persistence and dyeing condition, and tend to have low resistance to washing such as shampooing.

[0005] Conventional technologies to improve the weak dyeing power of such hair dyes are disclosed in Patent Document 1 and Patent Document 2. Patent Document 1 discloses a hair dye that is said to improve dyeing power and wash resistance by cleaving disulfide bonds in the hair with a specific reducing agent and promoting the diffusion of dye to the deeper parts of the hair. Patent Document 2 discloses a hair dye that contains a specific reducing agent such as thioglycolic acid, which has weak reducing power, and a specific basic dye in a certain ratio, and is said to have high dye accumulation in the hair without causing disulfide bond cleavage. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2015-166378 [Patent Document 2] Japanese Patent Publication No. 2022-018304 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] The object of the present invention is to provide a multi-component hair dye and a hair dyeing method using the same, which can enhance hair dyeing power without repeated use, while using direct dyes such as HC dyes and basic dyes, which are thought to remain in the surface and outer layer of the hair, and which can also suppress damage to the hair, have strong resistance to washing, and have excellent resistance to fading. [Means for solving the problem]

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

[0009] In other words, the present invention is a multi-component hair dye for dyeing hair, comprising: an introductory treatment agent containing 0.5 to 8.0% by weight of a reducing agent and applied to the hair; a hair dye containing a basic dye, an HC dye, an oil, a surfactant, and a moisturizer and applied to the hair; and a finishing treatment agent containing 0.5% by weight or more of an oxidizing agent and applied to the hair.

[0010] Furthermore, the hair dyeing method using the multi-component hair dye of the present invention includes the steps of applying the introductory treatment agent to the hair and letting it stand, applying the hair dye to the hair and letting it stand, followed by rinsing with water, and applying the finishing treatment agent to the hair and letting it stand, followed by rinsing with water. [Effects of the Invention]

[0011] According to the multi-component hair dye of the present invention, by applying the introductory treatment agent to the hair, the reducing agent contained in the introductory treatment agent dissociates the disulfide bonds in the hair, particularly the disulfide bonds between the cuticles that overlap in a scale-like manner on the surface of the hair. This allows the direct dyes, such as HC dyes and basic dyes contained in the hair dye, to penetrate deeply into the gaps in the cuticles and further promote penetration into the surface layer of the cortex located inside the cuticles. This makes it possible to improve the hair dyeing power. In addition, since the oxidizing agent contained in the finishing treatment agent reconstructs the disulfide bonds, it is possible to prevent the direct dyes that have penetrated deeply into the gaps in the cuticles from flowing out of the gaps in the cuticles, and thus effectively suppress fading due to washing such as shampooing.

[0012] On the other hand, the present invention contains a reducing agent in the introductory treatment agent and an oxidizing agent in the finishing treatment agent for the purpose of enhancing hair dyeing power. However, since the intention is to dissociate and reform the disulfide bonds between the cuticles that overlap in a scale-like manner on the surface of the hair, the concentrations of these reducing and oxidizing agents can be lower than those of perming agents, which require penetration into the deeper layers of the hair. This makes it possible to enhance hair dyeing power while minimizing damage to the hair. [Modes for carrying out the invention]

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

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

[0015] Among direct dyes, those with relatively small molecular weights, such as HC dyes, penetrate the gaps in the cuticles, which are the scale-like layers that make up the surface of the hair, and adhere to the hair, thereby coloring it. However, dyes that easily penetrate the gaps in the cuticles are also easily washed away through these gaps by shampooing, resulting in weak coloring power and a short-lasting coloring effect.

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

[0017] The aforementioned introductory treatment agent contains a reducing agent intended to dissociate disulfide bonds in hair in water as a solvent. Examples of the reducing agent include thioglycolates, sulfites, sodium thiosulfate, cysteine ​​or its salts, acetylcysteine, cysteamine or its salts, butyrolactone thiol, and the like.

[0018] Furthermore, the reducing agent content is 0.5 to 8.0% by weight of the total amount of the introductory treatment agent, preferably 2.0 to 6.0% by weight. As will be shown in the experimental results described later, if the reducing agent content is less than 0.5% by weight, a decrease in the hair dyeing effect is observed. This is thought to be because the amount of dissociation of disulfide bonds present in the gaps of the cuticle decreases, preventing direct dyes such as HC dyes contained in the hair dye from penetrating deeply into the gaps of the overlapping cuticles. Also, if the reducing agent content exceeds 8.0% by weight, hair damage becomes significant, resulting in more breakage and split ends after dyeing. This is thought to be because the reducing agent acts on the cortex present inside the cuticle, causing further hair damage.

[0019] The aforementioned introductory treatment agent contains sodium hydroxide as a pH adjuster and is adjusted to an alkaline pH of 7.0 to 10.0. Maintaining the introductory treatment agent at this pH level softens and swells the hair, thereby promoting the penetration of the reducing agent into the hair. Potassium hydroxide, ammonia, triethanolamine, diethanolamine, monoethanolamine, carbonate, bicarbonate, arginine, aminomethylpropanol, etc., can be used as the pH adjuster.

[0020] Furthermore, the aforementioned introductory treatment agent contains amphoteric surfactants, 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, lauramidopropyl hydroxysultaine, and anionic surfactants, such as carboxylates, alkyl ether carboxylates, alkyl sulfates, alkyl ether sulfates, acyl isethionates, alkyl sulfons, and acyl peptides, for the purpose of foaming, conditioning, penetration promotion, and emulsification. It contains α-olefin sulfonates, acyl sarcosine salts, acyl methylalanine salts, acyl glutamates, acyl aspartates, acyl glycines, acyl alanines, acyl methyl taurates, acyl lactates, cationic surfactants such as quaternary ammonium salts, tertiary ammonium salts, imidazolinium salts, pyridinium salts, and benzyl ammonium salts, as well as 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 aforementioned introductory treatment agent contains polyhydric alcohols, such as propylene glycol, butylene glycol, dipropylene glycol, pentylene glycol, ethylhexylglycerin, glycerin, and alcohols, such as ethanol and benzyl alcohol, for the purpose of conditioning and promoting penetration. Furthermore, it contains urea for the purpose of conditioning and promoting penetration. In addition, it contains polyquaternium-10, cationized guar gum, cationized cellulose, xanthan gum, hydroxyethylcellulose, and carbomer for the purpose of conditioning and thickening.

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

[0023] In addition, the introduction treatment agent may contain 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, karanja oil, sesame 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, anise seed oil, meadowfoam oil, chamomile seed oil, black seed oil, pumpkin seed oil, animal oils such as lanolin, mink oil, squalene, squalene, horse oil, mutton fat, fish oil, plant extracts for the purpose of conditioning and hair repair. Further, for the purpose of hair repair, it may contain hydrolyzed keratin, hydrolyzed collagen, ceramide, and hyaluronic acid.

[0024] The components described above can be arbitrarily selected and used according to 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 the hair after the required time has elapsed since the introduction treatment agent was applied, and is used for the purpose of permeating HC dyes and basic dyes as direct dyes into the hair to dye the hair. The hair dye is basically applied to the hair after the introduction treatment agent has been applied, but it can also be applied to the hair in a state of being mixed with the introduction treatment agent. However, when applied in a mixed state, there is a concern that the concentration of the direct dye will be diluted by the moisture of the introduction treatment agent, resulting in a decrease in the hair dyeing effect.

[0026] <{ As the dyes contained in the hair dye, for example, HC dyes such as HC Blue 2, HC Blue 16, HC Blue 15, HC Yellow 4, HC Yellow 2, HC Red 3, etc., 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, Basic Violet 2, etc. can be arbitrarily combined and used. The dyes are mixed with water, surfactants, oils, etc., and the dosage form is in a cream state.

[0027] Also, the hair dye is adjusted to an alkaline pH of 7.0 to 10.0 with a pH adjuster such as ammonium carbonate. Thereby, it is possible to maintain the state of the hair that has swelled and the cuticle has opened due to the introduction treatment agent, and it is possible to promote the penetration of the dyes in the hair dye inside the cuticle.

[0028] Furthermore, the hair dye contains a cationic surfactant, which exhibits the function of neutralizing the static electricity of the hair negatively charged by weak alkalinity and suppressing the frizz of the hair. As this cationic surfactant, steartrimonium chloride, behentrimonium chloride, stearamidopropyldimethylamine, etc. can be used.

[0029] Furthermore, the hair dye may also contain hair repair components such as hydrolyzed keratin and hydrolyzed collagen, and moisturizing components such as glycerin, in order to care for hair damaged by the reducing agent contained in the introductory treatment agent. Fragrances may also be included.

[0030] Next, the finishing agent will be described. This finishing agent is applied to hair that has been dyed with the hair dye, and is used to enhance the duration of the dyeing effect. Whether or not this finishing agent is applied makes a difference in the duration of the dyeing effect after dyeing by the method of the present invention.

[0031] The aforementioned finishing agent contains an oxidizing agent intended to recombine disulfide bonds in the hair, in addition to a cream base. Potassium bromate, sodium bromate, sodium perborate, sodium percarbonate, hydrogen peroxide, etc., can be used as the oxidizing agent.

[0032] Furthermore, the content of the oxidizing agent is 0.5% by weight or more, preferably 1.5 to 3.5% by weight, relative to the total amount of the finishing treatment agent. As will be shown in the experimental results described later, when the content of the oxidizing agent was less than 0.5% by weight, there was a difference in the persistence of the color when the hair was washed with shampoo after the application of the finishing treatment agent. This is thought to be because the disulfide bonds inside the CMC that bond the cuticles together were not sufficiently reformed, and the dye that had entered the gaps in the cuticles was washed out by the washing process.

[0033] Furthermore, the concentration of the oxidizing agent in the finishing treatment agent is preferably 25-50% of the concentration of the reducing agent in the introductory treatment agent. As will be shown in the experimental results described later, if the concentration of the oxidizing agent relative to the concentration of the reducing agent is less than 25%, the recombination of disulfide bonds inside the CMC that have been dissociated by the reducing agent is not sufficiently performed, and it is thought that the ability to retain the dye that has entered the gaps in the cuticle decreases. On the other hand, if the concentration of the oxidizing agent relative to the concentration of the reducing agent exceeds 50%, the hair dyeing effect is maintained to some extent, but the oxidizing agent is excessive compared to the reducing agent, and the hair is damaged by the oxidizing agent, resulting in a decrease in the hair dyeing effect.

[0034] The aforementioned finishing agent may also contain garlic iodide extract for the purpose of activating hair papilla cells and epidermal keratinocytes, as well as protecting the scalp from oxidizing agents.

[0035] Furthermore, the finishing agent contains amphoteric surfactants, 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, lauramidopropyl hydroxysultaine, and anionic surfactants, such as carboxylates, alkyl ether carboxylates, alkyl sulfates, alkyl ether sulfates, acyl isethionates, alkyl sulfons, and acyl peptides, for the purpose of foaming, conditioning, penetration promotion, and emulsification. It contains α-olefin sulfonates, acyl sarcosine salts, acyl methylalanine salts, acyl glutamates, acyl aspartates, acyl glycines, acyl alanines, acyl methyl taurates, acyl lactates, cationic surfactants such as quaternary ammonium salts, tertiary ammonium salts, imidazolinium salts, pyridinium salts, and benzyl ammonium salts, as well as 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 conditioning and penetration enhancement, it contains polyhydric alcohols such as propylene glycol, butylene glycol, dipropylene glycol, pentylene glycol, ethylhexylglycerin, and glycerin, as well as alcohols such as ethanol and benzyl alcohol. It also contains polyquaternium-10, cationized guar gum, cationized cellulose, xanthan gum, hydroxyethylcellulose, and carbomer for conditioning and thickening purposes. Furthermore, it contains, as an oily 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 thearic acid; mineral oils such as liquid paraffin, squalene, and isododecane; waxes such as carnauba wax, candelilla wax, beeswax, microcrystalline wax, and paraffin; and ester oils such as isopropyl palmitate, cetyl ethylhexanoate, (caprylic / capric acid) coconut alkyl, octyldodecyl myristate, and isopropyl myristate.

[0037] Furthermore, the aforementioned finishing treatment agent is intended for conditioning and hair repair and contains 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, evening primrose oil, blackcurrant oil, echinacea oil, apricot kernel oil, mongongo oil, Brazil nut oil, pistachio oil, passion fruit seed oil, karanga oil, sesame oil. It is acceptable to include ingredients such as 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, cotton seed 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, squalene, horse oil, mutton fat, fish oil, and plant extracts. It is also acceptable to include hydrolyzed keratin, hydrolyzed collagen, ceramide, and hyaluronic acid for the purpose of hair repair.

[0038] The components described above can be arbitrarily selected and used depending on the dosage form of the finishing agent, such as cream, emulsion, or foam.

[0039] The finishing agent contains pH adjusters such as phosphoric acid, citric acid, lactic acid, glyoxylic acid, levulinic acid, maleic acid, and fumaric acid, and is adjusted to a weakly acidic pH of 3.0 to 7.0. By maintaining the finishing agent at this pH value, the hair cuticle is closed, and the retention of the dye, hair repair components, moisturizing components, etc., can be enhanced.

[0040] Next, we will describe the experimental results that confirmed the effectiveness of the present invention method.

[0041] [Experiment 1] In this experiment, multiple pre-treatment agents with different concentrations of reducing agent were prepared, and hair bundles were treated in the order of pre-treatment agent, hair dye, and finishing agent to confirm the differences in hair dyeing effect and the degree of hair damage at each concentration of 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 bundles in an introductory treatment agent containing ammonium thioglycolate as a reducing agent, and leave them standing for 15 minutes at 40°C. 2. Wipe off any moisture from the hair strands removed from the introductory treatment solution with a paper towel. 3. Apply the hair dye to the hair strands and leave it undisturbed for 15 minutes at a temperature of 40°C. 4. Rinse the hair strands with water. 5. Immerse the hair bundles in a finishing agent containing 1.5% by weight of sodium bromate as an oxidizing agent, and leave them standing for 15 minutes at 40°C. 6. After rinsing the hair strands with water, let them air dry. 7. Visually inspect the dyeing effect on the air-dried hair strands and evaluate it on a 5-point scale. 8. Comb the hair strands 30 times using a comb and measure the weight of the resulting breakage.

[0043] [Table 1]

[0044] As can be seen from these experimental results, a hair dyeing effect was obtained when the reducing agent concentration was 0.5% by weight or higher, and particularly good hair dyeing effects were obtained when it was between 2.0% and 6.0% by weight. Furthermore, it was confirmed that when the reducing agent concentration exceeded 6.0% by weight, the occurrence of hair breakage when combing with a comb increased, indicating significant hair damage.

[0045] [Experiment 2] In this experiment, multiple finishing agents with different concentrations of oxidizing agent were prepared. Hair strands were treated in the order of introductory agent, hair dye, and finishing agent, and then washed with shampoo to confirm the differences in color retention at each concentration of oxidizing agent. In addition, to investigate the relationship between the concentration of reducing agent in the introductory agent and the concentration of oxidizing agent in the finishing agent, experiments were conducted with two types of introductory 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, along with the experimental results in Table 2 (thioglycolic acid concentration of 2.0 wt%) and Table 3 (thioglycolic acid concentration of 6.0 wt%). 1. Immerse the hair bundles in an introductory treatment agent containing ammonium thioglycolate as a reducing agent, and leave them standing for 15 minutes at 40°C. 2. Wipe off any moisture from the hair strands removed from the introductory treatment solution with a paper towel. 3. Apply the hair dye to the hair strands and leave it undisturbed for 15 minutes at a temperature of 40°C. 4. Rinse the hair strands with water. 5. Immerse the hair bundles in a finishing agent containing sodium bromate as an oxidizing agent, and leave them to stand for 15 minutes at 40°C. 6. Wash the hair strands five times using shampoo, then dry them with a hairdryer. 7. Visually inspect the dyeing effect on the dried hair strands and evaluate it on a 5-point scale.

[0047] [Table 2]

[0048] [Table 3]

[0049] As can be seen from these experimental results, if the concentration of the oxidizing agent in the finishing treatment agent is 0.5% by weight or higher, a certain degree of color retention can be obtained, and it was also confirmed that it is resistant to washing with shampoo. However, as shown in Table 2, when the reducing agent concentration is 2.0% by weight and the oxidizing agent concentration exceeds 1.0% by weight, the color retention effect is slightly impaired. Upon examining the hair strands after the experiment, it was determined that this was because the concentration of the oxidizing agent was excessive relative to the concentration of the reducing agent, and the damage to the hair progressed due to the action of the oxidizing agent.

[0050] Furthermore, it was confirmed that the optimal concentration of the oxidizing agent for maximizing color retention varies depending on the concentration of the reducing agent in the introductory treatment agent. Based on these experimental results, it was found 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 in the finishing treatment agent is 25% or more of the concentration of the reducing agent in the introductory treatment agent. However, it was also found that if the concentration of the oxidizing agent exceeds 50% of the concentration of the reducing agent, the action of the oxidizing agent causes further damage to the hair, and the color retention effect is actually impaired.

[0051] As explained above, the multi-component hair dye of the present invention exhibits high dyeing power even when using direct dyes such as HC dyes and basic dyes, which are thought to remain on the surface and outer layer of the hair. Therefore, it is possible to obtain a high dyeing effect with a single use, and it has strong resistance to washing, so it is possible to maintain the dyeing effect and prevent fading even after repeated washing. In addition, since a high dyeing effect can be obtained with direct dyes while keeping the concentration of reducing agents that break disulfide bonds and oxidizing agents that recombine them low, it is possible to dye the hair while minimizing damage to the hair.

Claims

1. A multi-component hair dye for coloring hair, An introductory treatment agent containing 0.5 to 8.0% by weight of a reducing agent, which is applied to the hair, A hair dye containing basic dyes, HC dyes, oils, surfactants, and moisturizers, applied to the hair. A finishing treatment agent applied to hair containing 0.5% by weight or more of an oxidizing agent, A multi-component hair dye characterized by being composed of the following.

2. The multi-component hair dye according to claim 1, characterized in that the concentration of the reducing agent in the aforementioned introductory treatment agent is 2.0 to 6.0% by weight.

3. The multi-component hair dye according to claim 2, characterized in that the concentration of the oxidizing agent in the finishing agent is 1.5 to 3.5% by weight.

4. The multi-component hair dye according to claim 3, characterized in that the concentration of the oxidizing agent contained in the finishing agent is 25 to 50% of the concentration of the reducing agent contained in the introductory agent.

5. A hair dyeing method using the multi-component hair dye described in claim 1, The process involves applying the aforementioned treatment agent to the hair and letting it stand, The process involves applying the aforementioned hair dye to the hair, letting it stand, and then rinsing it with water. A hair dyeing method comprising the steps of applying the aforementioned finishing agent to the hair, letting it stand, and then rinsing it with water.

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