WO2024027859A1

WO2024027859A1 - Double-agent-form hair dye and use method therefor

Info

Publication number: WO2024027859A1
Application number: PCT/CN2023/130807
Authority: WO
Inventors: 李宗圣; 郭荣耀; 孟力峰
Original assignee: 北京芙洛迪科技有限公司
Priority date: 2023-09-11
Filing date: 2023-11-09
Publication date: 2024-02-08

Abstract

A double-agent-form hair dye and a use method therefor. The hair dye takes a melanin precursor as a dye intermediate, and the double-agent-form hair dye comprises: an agent I and an agent II, wherein the agent I comprises a melanin precursor and an aqueous medium; and the agent II comprises an alkaline agent and an aqueous medium, and the pH of the agent II is 8-14. The double-agent-form hair dye further comprises a surfactant and a thickening agent, and the surfactant and the thickening agent are at least present in the agent I. The alkaline agent and the dye intermediate, which mainly takes the role of dyeing the hair, are divided into two agents in the double-agent-form hair dye. The agent I containing the dye intermediate is firstly used during the hair dyeing process, and the agent II containing the alkaline agent is then used. Compared with a single-agent-form hair dye, the double-agent-form hair dye has stronger coloring effects, a better dyeing uniformity and easy product storage.

Description

A kind of double-dose hair dye and its use method

Technical field

The present invention relates to the technical field of hair dyes, and in particular to a double-dose hair dye and a method of using the same.

Background technique

As people's requirements for quality of life and personal image improve, the demand for dyeing white hair into black hair or natural hair color continues to increase. More and more people with white hair want to use healthy hair dyes. According to the length of attachment time, hair dyes are divided into temporary hair dyes, semi-permanent hair dyes and permanent hair dyes. Permanent hair dyes are highly sought after because of their long-lasting color properties.

The effective blackening ingredients in existing permanent hair dyes are mainly paraphenylenediamine and its derivatives. Paraphenylenediamine hair dyes are also called oxidative hair dyes. The specific dyeing mechanism of this hair dye is to make low molecular weight hair dyes Oxidation dye intermediates and other ingredients penetrate into the inner layer of the hair, undergo oxidative polymerization in the hair to form macromolecular dyes, and are locked in the hair. Oxidative hair dyes are almost always composed of three main reactive compounds: dye intermediates, coupling agents and oxidants. Most p-phenylenediamine hair dyes are double-dose hair dyes, which divide the dye intermediates and oxidants into two parts for storage. Mix the two ingredients before dyeing your hair and apply them uniformly to your hair. The use of p-phenylenediamine hair dyes often causes allergic reactions and causes the hair to become dry and deteriorated. The dyed black hair looks abrupt and unnatural. Modern scientific research also shows that phenylenediamine and some of its derivatives are cumulative, rusty, and mutagenic, and can cause adverse effects such as keratitis, nephritis, and leukemia.

5,6-Dihydroxyindole and its derivatives are important intermediates in the process of synthesizing melanin from tyrosine. They quickly oxidize and polymerize in the air under alkaline conditions to generate melanin, which is good for dyeing keratin fibers. It has no irritating effects on human skin and is very suitable as an active ingredient in hair dyes. Since the hair dyeing effect comes from the melanin generated after the oxidative polymerization of dihydroxyindole, it is very close to natural black hair, and the dyed hair looks very natural. This type of hair dye is currently only available as a single-dose hair dye from Kao Co., Ltd. Listed. Since 5,6-dihydroxyindole and its derivatives need to be rapidly oxidized by air under alkaline conditions, To form melanin, single-dose hair dyes need to contain dihydroxyindole and alkali at the same time, which leads to the following problems: 1. Since single-dose hair dyes contain dihydroxyindole and alkali at the same time, single-dose hair dyes are very easy to deteriorate and require the use of special Packaging can solve the stability problem to a certain extent, thus increasing the cost of single-dose hair dye. 2. Due to the large molecular weight of melanin, it cannot be firmly combined with hair and has minimal coloring activity on human hair. As a result, the dyeing effect of single-dose hair dye is not ideal, and hair dyeing needs to be repeated continuously to achieve better dyeing effects.

Therefore, continuously improving the hair dyeing effect of 5,6-dihydroxyindole hair dyes is a goal pursued by the industry.

Contents of the invention

In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide a double-dose hair dye and a method of using the same, so as to solve the problems of poor coloring effect, uniformity deviation and stability of single-dose hair dye.

In order to achieve the technical effects, the technical solutions adopted by the present invention are as follows:

The invention provides a two-part hair dye, which uses a melanin precursor as a dye intermediate. The two-part hair dye includes: Agent I and Agent II, where the I agent contains a melanin precursor and an aqueous medium; the II agent The agent includes an alkaline agent and an aqueous medium, and the pH of the II agent is 8-14;

The two-part hair dye further includes a surfactant and a thickening agent, which are at least present in the first agent;

The melanin precursor includes at least one of the compounds having the structure shown in Formula I below:

In the formula, R ¹ represents a hydroxyl group or an acetoxy group, R ² represents a hydrogen atom, -COOR or -COO ^- X ⁺ , where R is a hydrogen atom, methyl or ethyl group, X ⁺ is a cation, and R ³ represents a hydrogen atom, Acetyl, methyl or ethyl.

In the above two-part hair dye, as an optional method, the melanin precursor is 5,6-dihydroxyindole and/or 5,6-dihydroxyindole-2-carboxylic acid;

In the above two-part hair dye, as an optional method, the weight percentage of the dye intermediate in Part I is 0.1-5%;

In the above two-part hair dye, as an optional method, the alkali agent is an organic alkali, an inorganic alkali or a mixture of an organic alkali and an inorganic alkali;

In the above two-part hair dye, as an optional method, the pH of the II agent is 9-14;

In the above two-part hair dye, as an optional method, the aqueous medium as the solvent is water, or a mixture of water and alcohol;

In the above two-part hair dye, as an optional mode, the surfactant is at least one of a nonionic surfactant, an anionic surfactant, and an amphoteric surfactant.

In the above two-part hair dye, as an optional method, the surfactant is present in the I agent and the II agent at the same time. In the I agent, the mass percentage content of the surfactant is preferably 5- 33%. In Agent II, the mass percentage content of the surfactant is preferably 2-35%.

In the above two-part hair dye, as an optional method, the non-ionic surfactant is selected from the group consisting of steareth-20, cetearyl-25, and cetearyl-25. -30, ceteareth-40, any one or more of glyceryl monostearate, PEG-100 stearate, oleth-30, oleth-40 ;

The anionic surfactant is selected from the group consisting of sodium laureth sulfate, potassium cocoyl glycinate, sodium cocoyl glycinate, TEA salt of cocoyl glutamate, sodium C14-16 olefin sulfonate, and lauroyl glutamate. Disodium, alkyl glucosides, sodium lauroyl sarcosinate, sodium methyl cocoyl taurate, sodium lauroyl glutamate, sodium methyl lauroyl taurate, cocoyl isethionate Any one or more of sodium, potassium cocoylglycinate, and sodium diethylhexyl sulfosuccinate;

The zwitterionic surfactant is selected from the group consisting of cocamidopropyl betaine, disodium cocamodiacetate, lauroamphodiacetate, cocamidopropyl hydroxysulfobetaine, and lauroamphoacetic acid. Any one or two or more types of sodium.

In the above two-part hair dye, as an optional method, in the I agent, the mass percentage of non-ionic surfactant is 2-5%, the mass percentage of anionic surfactant is 3-19%, and the mass percentage of zwitterionic surfactant is 2-5%. The mass percentage of surfactants is 3-9%; in II agent, the mass percentage of non-ionic surfactants is 1-6%, the mass percentage of anionic surfactants is 0.5-19%, and the mass percentage of zwitterionic surfactants The mass percentage is 1-9%.

In the above two-part hair dye, as an optional method, the thickener is a polymer thickener or/and an alcohol thickener.

In the above two-part hair dye, as an optional method, the thickener is present in the I at the same time. In agent I and agent II; preferably, the thickener is present in agent I and agent II at the same time. In agent I, the mass percentage of the thickener is greater than 0 and less than or equal to 25%; in agent II , the mass percentage of the thickener is greater than 0 and less than or equal to 25%.

In the above two-part hair dye, as an optional mode, the two-part hair dye further includes an antioxidant;

In the above two-part hair dye, as an optional method, the two-part hair dye further includes a conditioning agent;

In the above two-part hair dye, as an optional method, the two-part hair dye further includes essence.

In the above two-part hair dye, as an optional method, the antioxidant is present in the I agent; the conditioning agent is present in the I agent and II agent at the same time.

In the above two-part hair dye, as an optional mode, the antioxidant is ascorbic acid and/or sodium sulfite; or/and, in the first agent, the mass percentage of the antioxidant is 0.5-15%;

In the above two-part hair dye, as an optional method, the conditioning agent is at least one of silicone substances, polyquaternium-7, and anti-hair loss care agents.

The present invention also provides a method for using the above-mentioned double-dose hair dye, which includes: firstly applying agent I evenly to the hair, and then applying agent II evenly to the hair dyed with agent I, and then leaving it for 5-60 minutes. Rinse hair to complete coloring.

In the above method of using the two-part hair dye, as an optional method, the residence time is 5 to 30 minutes, preferably 15 minutes;

In the use method of the above two-part hair dye, as an optional method, according to the mass ratio, the dosage ratio of the I agent and II agent is 1:0.5~1.5;

In the above method of using the two-part hair dye, as an optional method, wait for 0-1 minute after evenly applying Part I, and then apply Part II.

Compared with the prior art, the present invention at least has the following beneficial effects:

1. The double-agent hair dye of the present invention divides the alkali agent and the dye intermediate that mainly plays a hair dyeing role into two agents. During the hair dyeing process, the I agent containing the dye intermediate is first used, and then the II agent containing the alkali agent is used. Double-dose hair dye has stronger coloring effect and better dyeing uniformity than single-dose hair dye with the same components.

2. The double-dose hair dye of the present invention has a short hair dyeing time. After applying agent I and agent II, it can stay for at least 5 minutes to achieve good coloring effect and dyeing uniformity.

3. Further, in the double-dose hair dye containing antioxidants of the present invention, the antioxidant and the dye intermediate are present in at least the first agent. On the one hand, it can increase the stability of the shelf life of the hair dye and avoid the oxidative failure of the dye intermediate. It can improve the dyeing ability of hair dye.

4. Furthermore, when the double-dose hair dye of the present invention contains a conditioner, after the dyeing is completed, the hair is smooth and supple, and there is no need to use shampoo and conditioner. That is, the hair dye of the present invention can save the need for washing after dyeing. Hair and hair care steps.

Description of the drawings

Figure 1 is a diagram showing the effect of using the hair dye obtained in Example 1 and Comparative Example 1 of the present invention to dye hair using the method of the use example of the present invention and the method of the comparative use example 1 respectively;

Figure 2 is a diagram showing the effect of the hair dye obtained in Example 1 of the present invention after being dyed using the method of the use example of the present invention and the method of comparative use example 2;

Figure 3 is a diagram showing the effect of using the hair dye obtained in Example 1 of the present invention and the hair dye obtained in Example 5 of the present invention after using the method of the use example of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Those skilled in the art should understand that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

The embodiments of the present invention are implemented on the premise of the technical solution of the present invention, and detailed implementation modes and processes are given. However, the protection scope of the present invention is not limited to the following examples. No specific details are specified in the following examples. The process parameters of the conditions are usually in accordance with conventional conditions.

The endpoints of ranges and any values disclosed in this disclosure are not limited to the precise range or value, but these ranges or values are to be understood to include values approximating those ranges or values. For numerical ranges, the endpoint values of each range, the endpoint values of each range and individual point values, and the individual point values can be combined with each other to obtain one or more new numerical ranges. These values Ranges should be considered to be specifically disclosed in this disclosure.

In the present invention, unless otherwise specified and/or stated, all references to % are "mass percentages" throughout.

Specific techniques or conditions not specified in the examples should be carried out in accordance with the techniques or conditions described in literature in the field, or in accordance with product instructions. If the manufacturer of the reagents or instruments used is not indicated, they are all conventional products that can be purchased through regular channels.

During the development process of melanin precursors such as dihydroxyindole hair dyes, the inventor accidentally discovered that single-dose hair dyes are mixed with dihydroxyindole and alkali, and because in the presence of alkali, dihydroxyindole will It is rapidly oxidized and polymerized by oxygen in the air to form melanin. That is to say, when the mixture of dihydroxyindole and alkali is applied to the hair, most of the dihydroxyindole has not yet had time to combine with the hair and is rapidly oxidized and polymerized. Melanin is generated, so that the melanin stays on the surface of the hair for a short time, and its combination with the hair is not strong enough, resulting in poor dyeing effect. Therefore, the inventor thought of fully combining dihydroxyindole with the hair, and then oxidizing it with air under alkaline conditions to polymerize the melanin. Only in this way can the melanin be firmly bound to the hair, thereby improving the dyeing effect. To this end, the present invention proposes a two-part hair dye, which is to divide the alkali agent and dye intermediate used to open the hair cuticle and provide oxidizing conditions into two parts, and first use the I agent containing the dye intermediate and then use the II agent containing the alkali agent. Compared with the single-dose hair dye in which a dye intermediate and an alkali agent are mixed together, the double-dose hair dye of the present invention has better coloring effect, uniform dyeing, and better stability.

A specific embodiment of the present invention provides a two-part hair dye, which uses a melanin precursor as a dye intermediate. The two-part hair dye includes: Agent I and Agent II, where the I agent contains a melanin precursor and an aqueous medium, The II agent includes an alkaline agent and an aqueous medium, and the pH of the II agent is 8-14 (such as pH 8.5, 9, 9.5, 10, 10.5, 11, 12, 12.5, 13, or 13.5); the double agent The dosage form hair dye also includes a surfactant and a thickener, which are present in at least the first agent;

The melanin precursor includes at least one of the compounds having the structure shown in the following formula I:

The compound represented by Formula I is a melanin precursor that can be converted into melanin through air oxidation. As an example, the melanin precursor can be 5,6-dihydroxyindole, 5,6-dihydroxyindole-2-carboxylic acid. , 5,6-dihydroxyindoline, 5,6-dihydroxyindoline-2-carboxylic acid, etc. For dyeing hair to a natural black color, the melanin precursor is preferably 5,6-dihydroxyindole and/or 5,6-dihydroxyindole-2-carboxylic acid.

The content of the dye intermediate in the first agent can be the conventional dosage of indole hair dyes. In specific embodiments of the present invention, the weight percentage of the dye intermediate in the first agent is 0.1-5% (such as 0.2%, 0.5%, 1%, 2%, 2.5%, 3%, 3.5%, 4%, or 4.5%).

The alkali agent can swell the hair and open the hair cuticles, allowing dye intermediates to penetrate into the interior of the hair, and provide conditions for the oxidative polymerization of the dye intermediates in the hair. The alkali agent of the present invention can be any of the common hair dyes. The alkaline agent used is not particularly limited. The alkaline agent may be an organic base, an inorganic base or a mixture of an organic base and an inorganic base. For example, it can be ammonia; alkanolamines such as monomethanolamine, dimethanolamine or trimethanolamine, monoethanolamine, diethanolamine or triethanolamine; methylamine, dimethylamine, ethylamine, diethylamine, N-methylethyl Alkali agents such as alkylamines such as amine, propylamine and butylamine; aralkylamines such as benzylamine; inorganic alkali compounds such as sodium hydroxide, potassium hydroxide, sodium carbonate and potassium carbonate can be one of these bases. Or 2 or more types. From the viewpoint of water solubility, the number of carbon atoms of the alkanolamine, alkylamine or aralkylamine is preferably 10 or less, and more preferably 8 or less. In certain embodiments of the present invention, the alkaline agent is an alkanolamine, an inorganic base or a mixture of an alkanolamine and an inorganic base; the alkaline agent is preferably a combination of ethanolamine and potassium hydroxide.

The alkaline agent preferably maintains the pH of the II agent at 9-14 (for example: pH is 9.5, 10, 10.5, or 11).

The aqueous medium is water, or a mixture of water and alcohol. The aqueous medium is used as a solvent. The alcohol can be lower alcohols such as ethanol and isopropyl alcohol, or it can be 1,3-butanediol, glycerol, or ethylene glycol. , propylene glycol and other diols or triols with less than 6 carbon atoms. The amount of aqueous medium used in Agent I is the balance, and the sum of the mass percentages of the aqueous medium and other components in Agent I is 100%. The amount of aqueous medium used in Agent II is the balance, and the sum of the mass percentages of the aqueous medium and other components in Agent II is 100%.

The surfactant used in the present invention can be a conventional surfactant used in ordinary hair dyes, for example, it can be at least one of nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants. The main function of the surfactant of the present invention is to emulsify, disperse dye intermediates, and auxiliary dye intermediates to penetrate into the hair. In addition, some surfactants with cleaning effects can also be added to the hair dye of the present invention, so that no need to Also use shampoo to clean your hair and scalp.

The non-ionic surfactant is typically selected from the group consisting of steareth-20 and cetearyl alcohol. Polyether-25, Cetearyl-30, Cetearyl-40, Glyceryl monostearate, PEG-100 stearate, Oleyl-30, Oleyl Any one or two or more types of ether-40. These nonionic surfactants are mild, low-irritation, and can emulsify.

The anionic surfactant is typically selected from the group consisting of sodium laureth sulfate, potassium cocoyl glycinate, sodium cocoyl glycinate, cocoyl glutamate TEA salt, sodium C14-16 olefin sulfonate, Disodium lauroyl glutamate, alkyl glucosides, sodium lauroyl sarcosinate, sodium methyl cocoyl taurate, sodium lauroyl glutamate, sodium methyl lauroyl taurate, cocoyl Any one or two or more of sodium isethionate, potassium cocoylglycinate, and sodium diethylhexyl sulfosuccinate. These anionic surfactants can function as emulsifiers, dye intermediate dispersants, dye intermediate penetrants, and detergents.

The zwitterionic surfactant is typically selected from the group consisting of cocamidopropyl betaine, disodium cocoamphodiacetate, laurolamidopropyl betaine, cocamidopropyl hydroxysulfobetaine, Any one or two or more types of sodium lauroamphoacetate. These zwitterionic surfactants can reduce system irritation and function as emulsifiers, dye intermediate dispersion, dye intermediate penetration, and detergents.

The cationic surfactant is typically, but not limited to, selected from at least one of quaternary ammonium salts, pyridinium salts, and the like. It can enhance the penetration of dye intermediates into the hair.

From the perspective of use effect, the surfactant is preferably present in the I agent and II agent at the same time, and the mass percentage of the surfactant in the I agent is 5-33% (such as 6%, 10% , 15%, 20%, 22%, 24% or 26%), the mass percentage of the surfactant in the II agent is 2-35% (such as 3%, 6%, 10%, 15%, 20%, 22%, 24% or 26%).

In the preferred embodiment of the present invention, the surfactants include nonionic surfactants, anionic surfactants and zwitterionic surfactants. Preferably, in agent I, the mass percentage of nonionic surfactants is 2 to 5% (such as 3%, 3.5%, 4% or 4.5%), the mass percentage of anionic surfactant is 3 to 19% (such as 5%, 8%, 10%, 12%, 14%, 16% or 18%), the mass percentage of zwitterionic surfactants is 3 to 9% (such as 4%, 5%, 6%, 7%, 8% or 8.5%); in II agent, nonionic surfactant The mass percentage of anionic surfactant is 1 to 6% (such as 2%, 4% or 5%), and the mass percentage of anionic surfactant is 0.5 to 19% (such as 1%, 3%, 5%, 8%, 10%, 12 %, 14%, 16% or 18%), the mass percentage of zwitterionic surfactant is 1 to 9% (such as 2%, 4%, 5%, 6%, 7%, 8% or 8.5%).

The stability of hair dye will vary slightly depending on the content of non-ionic surfactant. If the content is too low, the emulsification effect will be insufficient. If the content is too high, the cost will be high and it will cause irritation, which is unnecessary. anionic surface Active agents can be used as emulsifiers and detergents to make dyes disperse and penetrate well. However, if its content is too low, it will affect the emulsification effect, dye dispersion and permeability, and the cleaning effect. If its content is too high, the system viscosity will be affected and it will be too irritating. Amphoteric surfactants can be used as emulsifiers and detergents to make dyes disperse and penetrate well, and can reduce the irritation of hair dye systems. However, if their content is too low, it will affect the emulsification effect, dye dispersion and penetration, and the cleaning effect will also be affected. Affected, the content is too high, the viscosity of the system is affected, and the irritation is too great.

As an example of the present invention, the nonionic surfactant is steareth-20, the anionic surfactant is sodium laureth sulfate, and the amphoteric surfactant is cocamidopropyl beet Alkali.

The thickener added to the double-dose hair dye of the present invention can facilitate the actual operation of the hair dye so that it can be evenly coated and attached to the hair. The thickener of the present invention can be a thickener commonly used in ordinary cream hair dyes. , for example, it can be a nonionic or ionic polymer thickener, or an alcohol thickener. The nonionic thickener can be hydroxyethyl cellulose, sodium carboxymethyl cellulose, or hydroxyethyl cellulose. Sodium hydroxypropyl stearyl ether hydroxypropyl sulfonate, hydroxypropyl methylcellulose, guar gum, pullulan, hydroxypropyl chitosan, etc. Ionic polymer thickeners can be carrageenan, xanthan gum, polyacrylic acid, cationized cellulose derivatives, etc. Alcohol thickeners can be cetearyl alcohol, C12-14 alcohol, etc.

The thickener is present alone in the I agent or in both the I agent and II agent. The amount of thickener can ensure that the material adheres to the hair and can be combed and dyed smoothly. For some surfactants that also have a thickening effect, if such surfactants are added, the amount may be reduced depending on the situation. Other thickeners added. Illustratively, the thickener is present in both agent I and agent II. In agent I, the mass percentage of the thickener is greater than 0 and less than or equal to 25%; in agent II, the thickener is The mass percentage of the thickener is greater than 0 and less than or equal to 25%.

As examples of the present invention, the thickeners are hydroxyethyl cellulose, cetearyl alcohol and C12-14 alcohol.

From the perspective of improving shelf life and coloring effect, the two-part hair dye also includes antioxidants. The antioxidant is present alone in the I agent, alone in the II agent, or simultaneously in the I agent and II agent. More preferably, the antioxidant is only present in the first agent, and in the first agent, the mass percentage of the antioxidant is 0.5-15% (such as 1%, 1.5%, 2%, 3%, 5% , 7%, 10%, 12% or 14%).

The main function of the antioxidant is to prevent premature oxidation of dye intermediates in hair dyes and increase the shelf life. The antioxidants can be antioxidants commonly used in ordinary hair dyes, such as ascorbic acid, sodium metabisulfite, and sulfites.

As an example of the present invention, the antioxidants are ascorbic acid and sodium sulfite.

In a preferred embodiment of the present invention, the two-part hair dye also includes a conditioning agent, which can be a silicone substance that improves smoothness during drying, such as dimethylpolysiloxane, amino-modified silicone ( Amodimethicone); the conditioner can also be an antistatic softener that makes hair shiny, smooth and easy to comb, such as polyquaternium-7; the conditioner can also be an anti-hair loss care agent, such as dense Source plant extract; the conditioner can also be the hair care substance Totalcera ^TM T5. Miyuan plant extract is a natural plant raw material developed for hair loss. It mainly consists of Platycladus orientalis leaf extract, Zingiber officinale root extract, Trifolium pratense leaf extract and Artemisia argyi ) leaf extract compound.

The conditioning agent may be present in the I agent alone or in the II agent alone or in both the I agent and II agent. As a preferred way, the conditioning agent is present in both agent I and agent II; the amount of the conditioning agent can refer to the amount used in the shampoo or conditioner.

The two-part hair dye of the present invention can also include other auxiliaries used in ordinary hair dyes as needed, such as pH adjusters, anti-dandruff agents, bactericides, anti-inflammatory agents, preservatives, chelating agents, moisturizers, pearlescent agents, Fragrances, UV absorbers, etc.

In order to improve the convenience of use and dyeing ability, the I and II agents of the two-part hair dye of the present invention are preferably in the form of emulsion, which can be evenly coated and adhered to the hair, and can be combed and dyed smoothly without dripping.

In specific embodiments of the present invention, the components and weight % of the I agent include the following:

The components and weight % of the II agent include the following:

Agent I and agent II in the two-part hair dye of the present invention can be prepared by conventional methods. For example, preparation of agent I includes: preparation of oil phase, preparation of water phase, introduction of oil phase into water phase for homogenization and emulsification to obtain I. agent,.

Preparation of agent II includes: preparation of oil phase, preparation of water phase, introduction of oil phase into water phase for homogenization and emulsification to obtain agent II.

The following examples are all prepared by this method, and the details of the examples will not be repeated.

The present invention also provides a method for using the above-mentioned double-dose hair dye. First, apply agent I evenly on the hair, and then apply agent II evenly on the hair dyed with agent I. Leave it for 5-60 minutes and then rinse the hair. dyeing.

The hair refers to animal fur or human hair containing keratin fibers.

In the above usage method, as a preferred embodiment, the uniform coating method is a small amount of uniform combing and dyeing multiple times and/or multiple combing and dyeing in different directions.

In the above usage method, as a preferred embodiment, the residence time is 5 to 30 minutes, preferably 15 minutes.

When used, according to the mass ratio, the dosage ratio of the I agent and II agent is preferably 1:0.5~1.5 (for example: 1:0.7, 1:1, 1:1.2, or 1:1.4);

Normally, after evenly coating Agent I, wait 0-1 minute before applying Agent II. That is, there is no need to wait or apply Agent II immediately after applying Agent I.

After using the double-dose hair dye of the present invention and using the above-mentioned usage method to complete the dyeing, the hair will be smooth and supple, without the need to use shampoo and conditioner, that is, the hair dye of the present invention can save the steps of washing and conditioning the hair after dyeing.

The present invention will be described in further detail below with reference to specific embodiments.

Example 1

This embodiment provides a two-part hair dye, wherein:

The components and weight % of agent I include the following:

The components and weight % of agent II include the following:

The pH of Agent II is 12.79.

Example 2

This embodiment provides a two-part hair dye, wherein:

The components and weight % of agent I include the following:

The components and weight % of the II agent in this embodiment are the same as the formula of the II agent in Example 1.

Example 3

The components and weight % of the first agent in this embodiment are the same as the formula of the first agent in Example 1.

The components and weight % of the II agent in this embodiment include the following:

The pH of Agent II is 12.0.

Example 4

This embodiment provides a two-part hair dye, wherein:

The components and weight % of agent I include the following:

The components and weight % of agent II include the following:

The pH of Agent II is 12.75.

Example 5

In the two-part hair dye provided in this embodiment, except that the weight percentage of 5,6 dihydroxyindole in Part I is 0.2% and the weight percentage of deionized water is 45.8%, the other ingredients and contents in Part I are the same as those in Example 1 The I dose is the same. The formula of Agent II in this embodiment is the same as that of Agent II in Example 1.

Example 6

This embodiment provides a two-part hair dye, wherein:

The components and weight % of agent I include the following:

The components and weight % of agent II include the following:

The pH of Agent II is 12.35.

Example 7

The components and weight % of agent I include the following:

The components and weight % of agent II include the following:

Comparative example 1

This comparative example provides a single-dose hair dye. In terms of mass percentage, the ingredients of the single-dose hair dye are as follows:

Hair dyeing effect test

Examples of use of the present invention

The hair dye obtained in Examples 1-7 is used for hair dyeing. The specific usage method is as follows:

Among them, the method of using double-agent hair dye is as follows:

(1) Squeeze 1g of Agent I onto a flat comb, comb and dye a small amount several times evenly on 5g of completely dry white hair bundles. After the I agent is evenly combed and dyed, immediately proceed with Agent II in the same way;

(2) Leave both Part I and Part II for 20 minutes after combing and dyeing, then rinse with water to complete hair dyeing.

Comparative use example 1

Comparative Example 1 The single-dose hair dye is used as follows:

(1) Squeeze 2g of the single-dose hair dye of Comparative Example 1 onto a flat comb, and comb and dye a small amount several times evenly on 5g of completely dry white hair bundles;

(2) After dyeing evenly, leave it on for 20 minutes, then rinse with water to complete the dyeing.

Comparative use case 2

Among them, the method of using double-agent hair dye is as follows:

(1) Squeeze 1g of Agent II onto a flat comb, comb and dye a small amount of it several times on 5g of completely dry white hair bundles. After combing and dyeing Agent II evenly, proceed with Agent I in the same way;

The hair dyeing effect of the hair dyes obtained in Examples 1-7 and Comparative Example 1 was evaluated. A white hair bundle without any hair dye was taken as a blank control. Its color is as shown in Figure 1. The evaluation standard was set to 0-10. , "0" means that the dyeing degree of the dyed hair bundle is no different from the blank control. The larger the number, the deeper the dyeing degree of the dyed hair bundle is compared with the blank control. The evaluation of the hair dyeing effect of each hair dye is made by a five-person expert panel by visually inspecting the dyed hair bundles and comparing them with the blank control. The average value is taken as the final evaluation result of the hair dye, as shown in Table 1, and The numerical ratings in Table 1 are the average of five ratings.

Table 1 Hair dyeing effect evaluation table of hair dyes obtained in Examples 1-7 and Comparative Example 1

In addition, the dyeing results of Example 1 (i.e., double agent) and Comparative Example 1 (i.e., single agent) are shown in Figure 1 . It can be seen from the figure that the color of the hair dyed using the double-dose hair dye of Example 1 is much darker, darker, and closer to the natural color than the color of the hair dyed using the single-dose hair dye of Comparative Example 1. It can be seen that the hair color of the present invention Double-dose hair dye has better hair coloring effect than single-dose hair dye.

Figure 2 is a diagram showing the effect of using the hair dye obtained in Example 1 to color white hair bundles using the method of Use Example 1 and Comparative Use Example 2 of the present invention respectively. As can be seen from Figure 2, using the method of Use Example 1 of the present invention The coloring effect is better, consistent with the results in Table 1.

Figure 3 is a diagram showing the effect of using the hair dye obtained in Example 1 and Example 5 to color white hair bundles using the method of Example 1 of the present invention. As can be seen from Figure 3, the dosage of the dye intermediate is adjusted to 1 When the agent contains only 0.2%, the coloring effect can reach the effect of the single-dose hair dye containing 1%. This once again shows that under the same dosage of active ingredients, the coloring effect of the two-dose hair dye of the present invention is better.

Although the present invention has been described in detail with general descriptions and specific embodiments above, it is obvious to those skilled in the art that some modifications or improvements can be made based on the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection claimed by the present invention.

Claims

A two-part hair dye, characterized in that it uses a melanin precursor as a dye intermediate. The two-part hair dye includes: I agent and II agent, the I agent contains a melanin precursor and an aqueous medium; the II agent The agent includes an alkaline agent and an aqueous medium, and the pH of the II agent is 8-14;

The two-part hair dye further includes a surfactant and a thickening agent, which are at least present in the first agent;

The melanin precursor includes at least one of the compounds having the structure shown in Formula I below:

In the formula, R 1 represents a hydroxyl group or an acetoxy group, R 2 represents a hydrogen atom, -COOR or -COO - X + , where R is a hydrogen atom, methyl or ethyl group, X + is a cation, and R 3 represents a hydrogen atom, Acetyl, methyl or ethyl.
The double-dose hair dye according to claim 1, characterized in that:

The melanin precursor is 5,6-dihydroxyindole and/or 5,6-dihydroxyindole-2-carboxylic acid;

And/or, the weight percentage of the dye intermediate in agent I is 0.1-5%;

And/or, the alkaline agent is an organic base, an inorganic base or a mixture of an organic base and an inorganic base;

And/or, the pH of the II agent is 9-14;

And/or, the aqueous medium as the solvent is water, or a mixture of water and alcohol;

And/or, the surfactant is at least one of a nonionic surfactant, an anionic surfactant, and an amphoteric surfactant.
The double-dose hair dye according to claim 2, characterized in that:

The surfactant is present in both the I agent and the II agent. In the I agent, the mass percentage content of the surfactant is preferably 5-33%. In the II agent, the mass percentage of the surfactant is The percentage content is preferably 2-35%.
The double-dose hair dye according to claim 3, characterized in that:

The non-ionic surfactant is selected from the group consisting of steareth-20, cetearyl-25, cetearyl-30, cetearyl-40, monohard Any one or two or more of glyceryl fatty acid, PEG-100 stearate, oleth-30, oleth-40;

The anionic surfactant is selected from the group consisting of sodium laureth sulfate, potassium cocoyl glycinate, sodium cocoyl glycinate, TEA salt of cocoyl glutamate, sodium C14-16 olefin sulfonate, and lauroyl glutamate. Disodium, alkyl glucosides, sodium lauroyl sarcosinate, sodium methyl cocoyl taurate, sodium lauroyl glutamate, sodium methyl lauroyl taurate, cocoyl isethionate Any one or more of sodium, potassium cocoylglycinate, and sodium diethylhexyl sulfosuccinate;

The zwitterionic surfactant is selected from the group consisting of cocamidopropyl betaine, disodium cocamodiacetate, lauroamphodiacetate, cocamidopropyl hydroxysulfobetaine, and lauroamphoacetic acid. Any one or two or more types of sodium;

And/or, in agent I, the mass percentage of nonionic surfactant is 2-5%, the mass percentage of anionic surfactant is 3-19%, and the mass percentage of zwitterionic surfactant is 3-9% ; In the II agent, the mass percentage of nonionic surfactants is 1-6%, the mass percentage of anionic surfactants is 0.5-19%, and the mass percentage of zwitterionic surfactants is 1-9%.
The double-dose hair dye according to any one of claims 1-4, characterized in that,

The thickener is a polymer thickener or/and an alcohol thickener;

Or/and, the thickening agent is present in the I agent and the II agent at the same time; preferably, the thickening agent is present in the I agent and the II agent at the same time, and in the I agent, the thickening agent The mass percentage of the thickener is greater than 0 and less than or equal to 25%; in the II agent, the mass percentage of the thickener is greater than 0 and less than or equal to 25%.
The double-dose hair dye according to any one of claims 1-4, characterized in that,

The two-dose hair dye also includes antioxidants;

Or/and, the two-part hair dye also includes a conditioner;

Or/and, the two-part hair dye further includes fragrance.
The double-dose hair dye according to claim 6, characterized in that:

The antioxidant is present in the first agent;

The conditioning agent is present in both Agent I and Agent II.
The double-dose hair dye according to claim 7, characterized in that:

The antioxidant is ascorbic acid and/or sodium sulfite;

Or/and, in agent I, the mass percentage of the antioxidant is 0.5-15%;

The conditioning agent is at least one of silicone substances, polyquaternium-7, and anti-hair loss care agents.
The method of using a double-dose hair dye according to any one of claims 1 to 8, characterized in that it includes: firstly applying agent I evenly to the hair, and then evenly applying agent II to the hair dyed with agent I. Apply, leave for 5-60 minutes, then rinse hair to complete dyeing.
The method of using the two-part hair dye according to claim 9, characterized in that:

The residence time is 5 to 30 minutes, preferably 15 minutes;

And/or, according to the mass ratio, the dosage ratio of the I agent and II agent is 1:0.5~1.5;

And/or, wait 0-1 minute after evenly coating Agent I, and then apply Agent II.