Powdered hair dye compositions

Abstract

The present invention is a powder hair dye composition comprising an oxidizing agent, an intermediate, and a coupler, which is mixed with water and used, characterized by comprising: a thickening agent included in an amount of 55 to 60 parts by weight per 100 parts by weight of the oxidizing agent; and a hygroscopic agent included in an amount of 153 to 333 parts by weight per 100 parts by weight of the oxidizing agent, having a molecular weight of 1200 to 10000 Da and having a straight-chain or branched oligomeric carbohydrate having a hydroxyl group.

Description

Technology Field

[0001] The present invention relates to a hair dye composition in powder form, and in particular to a hair dye composition with improved viscosity stability. Background Technology

[0002] In general, hair dyes are used to change the color of hair, and two-part oxidative hair dyes are widely used. Two-part oxidative hair dyes are used by mixing a first part containing an oxidative dye and an alkali agent and a second part containing an oxidizing agent immediately before use, and have the advantage of ensuring stability for an average of three years at room temperature.

[0003] However, powder-form hair dyes are in the powder state of the first formulation, and the dyeing method involves mixing them with water in a specific ratio immediately before use, applying them to the hair, leaving them for a certain period of time, and then washing them off with water.

[0004] These powder hair dyes utilize the principle that oxygen generated when mixed with water oxidizes the melanin pigment in the hair to bleach it, while simultaneously causing the dye's intermediate and coupler components to undergo a condensation reaction to develop color. In particular, it is important to effectively control the reactivity of the perate components, and contact with moisture must be minimized so that the powder itself does not discolor or deteriorate even after long-term storage.

[0005] However, existing powder hair dyes are highly sensitive to moisture due to their powder form, leading to problems such as easy deterioration depending on temperature and humidity during storage or a loss of viscosity during use causing them to drip off the hair. These issues cause inconvenience for consumers and result in quality claims, so there is a need to improve them. Prior art literature

[0006] Korean Registered Patent 1023054010000 The problem to be solved

[0007] The present invention aims to solve the problem of conventional powder hair dyes easily deteriorating or losing viscosity due to moisture and environmental factors, which leads to poor usability when applied to hair. Specifically, the invention aims to significantly improve consumer convenience by effectively blocking moisture penetration even during long-term storage to prevent discoloration, deterioration, and clumping of the powder hair dye composition, and by continuously maintaining an appropriate viscosity even after mixing with water to prevent dripping or uneven application on the hair. means of solving the problem

[0008] A powder hair dye composition according to one aspect of the present invention comprises an oxidizing agent, an intermediate, and a coupler, and is a powder hair dye composition used by mixing with water, characterized by comprising: a thickening agent included in an amount of 55 to 60 parts by weight per 100 parts by weight of the oxidizing agent; and a hygroscopic agent included in an amount of 153 to 333 parts by weight per 100 parts by weight of the oxidizing agent, having a molecular weight of 1200 to 10000 Da and having a linear or branched oligomer carbohydrate having a hydroxyl group.

[0009] At this time, it is preferable that the moisture-repellent agent be dextrin and / or maltodextrin.

[0010] In addition, it is preferable that the above moisture-repellent agent has a DE value of 7.0 to 9.5.

[0011] In addition, the surface of the above moisture-repellent agent may be hydrolyzed using enzymes.

[0012] In addition, it is preferable that the above moisture-repellent agent be coated with one selected from the group consisting of glycerin, polyethylene glycol (PEG), trehalose, and maltose.

[0013] At this time, it is preferable that the above-mentioned thickening agent includes a first thickening agent having a linear polymer structure that swells and provides viscosity when combined with water.

[0014] In this case, the above-mentioned thickener may further include a second thickener that provides viscosity by forming a three-dimensional network structure when combined with water.

[0015] At this time, it is preferable that the first thickening agent and the second thickening agent be included in a ratio of 1:1 to 2:1.

[0016] In addition, it is preferable that the oxidizing agent includes sodium percarbonate (Na₂CO₃·1.5H₂O₂).

[0017] At this time, the first thickening agent may be one or more selected from the group consisting of sodium carboxymethylcellulose (CMC-Na), guar gum, and sodium polyacrylate.

[0018] In addition, it is preferable that the second thickening agent is xanthan gum and / or gelatin.

[0019] The powder hair dye composition according to the present invention may further include a pH adjuster that provides a pH in the range of 6.5 to 7.5.

[0020] In addition, the powder hair dye composition according to the present invention preferably further comprises at least one skin protectant selected from the group consisting of yeast extract, seaweed extract, aloe vera extract, glycerin, and vegetable oil.

[0021] At this time, when the above powder hair dye composition is used in water, it is preferable that the viscosity be 1,500 to 2,000 cps. Effects of the invention

[0022] The powder hair dye according to the present invention comprises 50 to 60 parts by weight of a thickening agent and 153 to 333 parts by weight of an anti-moisture agent based on 100 parts by weight of an oxidizing agent, and by configuring the first thickening agent and the second thickening agent in a ratio of 1:1 to 2:1, the anti-moisture agent is included in an appropriate amount to effectively control moisture penetration from the outside and changes in environmental humidity, thereby significantly improving long-term storage stability in powder form.

[0023] In addition, by optimizing the composition ratio and particle size range of the thickener, it immediately and stably forms an appropriate viscosity when mixed with water, preventing dripping from the hair and enabling uniform application, thereby increasing user convenience. Specific details for implementing the invention

[0024] Before describing the invention in detail below, it should be understood that the terms used in this specification are intended to describe specific embodiments only and are not intended to limit the scope of the invention, which is defined solely by the appended claims. Unless otherwise noted, all technical and scientific terms used in this specification have the same meaning as generally understood by those skilled in the art. Throughout this specification and claims, unless otherwise noted, the terms "comprise," "comprising," and "comprising" mean including the mentioned object, step, or group of objects and steps, and are not used to exclude any other object, step, or group of objects or groups of steps. Furthermore, in the drawings, the width, length, thickness, angle, etc., of components may be exaggerated for convenience. The drawings are described from the perspective of an observer, and when one component is described as being "above / below" or "on / under" another component, this includes not only the case where it is "immediately above / immediately below" the other component, but also the case where there is another component in between. Meanwhile, various embodiments of the present invention may be combined with any other embodiments unless explicitly stated otherwise. Any feature indicated as particularly desirable or advantageous may be combined with any other features and features indicated as desirable or advantageous. The present invention will be described in more detail below with reference to the drawings.

[0025] Powder hair dyes contain an oxidizing agent, an intermediate, a coupler, a thickening agent, a dispersant, an antihypertensive agent, and additives.

[0026] Oxidizers are key components that induce oxidation reactions during the dyeing process. Specifically, during dyeing, oxidizers are activated by contact with moisture to generate oxygen; this generated oxygen selectively oxidizes the melanin pigments present within the hair, thereby causing bleaching. At the same time, oxidizers facilitate the penetration of precursors—intermediates of the dye—and couplers into the hair fibers, promoting oxidative condensation reactions and enabling the color development effect to occur efficiently.

[0027] Oxidizing agents must satisfy requirements such as reaction activity, solubility, storage stability, and human safety. A representative substance that meets these conditions is sodium percarbonate (Na₂CO₃·1.5H₂O₂), which exhibits excellent oxidizing power by rapidly releasing hydrogen peroxide (H₂O₂) upon contact with water. Sodium percarbonate is considered the most suitable oxidizing agent from an engineering perspective because it simultaneously provides relatively high solubility, excellent oxidizing ability, and safety of byproducts.

[0028] In addition, sodium perborate, potassium persulfate (K₂S₂O₅), sodium persulfate (Na₂S₂O₅), and hydrogen peroxide (H₂O₂) can be used as oxidizing agents as metal peroxide salts, but their use is limited due to issues such as solubility and storage stability in powder formulations.

[0029] The average diameter of the oxidizing agent is preferably 0.2 mm to 1.0 mm, and the oxidizing agent may be composed of micro beads comprising a core containing a peracid metal salt; and at least one shell surrounding the core, wherein the shell contains a moisture-blocking agent for drying or blocking moisture.

[0030] Intermediates serve as precursors for forming the final pigment during the dyeing process and are key components of the dyeing reaction. While intermediates do not directly produce a coloring effect on the hair on their own, they react with another dye component called a coupler in the presence of an oxidizing agent to ultimately realize the desired color within the hair.

[0031] Intermediates used in oxidative hair dyes are generally derivatives of aromatic amines, typically aromatic compounds such as p-phenylenediamine and amino phenol derivatives. After being applied to the hair, these intermediates form an activated intermediate through an oxidation reaction with active oxygen species generated from an oxidizing agent (e.g., sodium percarbonate or hydrogen peroxide).

[0032] The active intermediate formed in this way forms a final color-developing compound through an oxidative coupling reaction with the coupler molecule, which will be described later and is additionally present in the hair dye. As the molecular weight of this color-developing compound increases, it binds tightly to the inside of the hair and does not easily leak out, thereby providing a continuous dyeing effect.

[0033] In this process, the chemical structure and type of the intermediate can determine the diversity and stability of the final color achieved. Additionally, the intermediate is designed to have a low molecular weight and appropriate hydrophilicity to efficiently penetrate the hair and enable bonding with the coupler.

[0034] A coupler is a key component that forms the final color-developing substance through an oxidation reaction together with an intermediate. Couplers do not exhibit color on their own and are characterized by developing color through an oxidative bonding reaction only when present together with an intermediate.

[0035] Specifically, the coupler reacts with an active intermediate generated when an intermediate (a dye precursor) within an oxidative hair dye is activated by an oxidizing agent (e.g., sodium percarbonate or hydrogen peroxide), forming pigment molecules with high molecular weight within the hair. These pigment molecules bind strongly to the interior of the hair and do not wash out easily, resulting in a permanent dyeing effect.

[0036] Representative compounds used as couplers generally consist of phenol derivatives, resorcinol derivatives, m-aminophenol derivatives, and naphthol derivatives that have aromatic structures. Representative examples include resorcinol, meta-phenylenediamine, and diaminophenol derivatives, which each have the characteristic of developing a specific color when reacting with an active intermediate.

[0037] The selection and combination of couplers determine the molecular structure and size of the pigments produced during the condensation reaction with intermediates, which in turn influences the type, depth, and stability of the final color realized. For example, resorcinol is suitable for producing primarily brown colors, metaaminophenol for reddish-brown colors, and diaminophenol for dark brown or black colors.

[0038] The coupler is also designed so that the combination of molecular weight and polarity is appropriate to effectively penetrate into the hair, and under optimized conditions, the binding reaction with the intermediate takes place deep inside the hair.

[0039] At this time, the average diameter of the intermediate and the coupler is preferably 0.1 mm to 0.7 mm. If it is less than the above range, the particles become light and fly away, and if it exceeds the above range, the particles get tangled with the thickener and the color development power decreases.

[0040] Thickeners are functional additives that maintain the appropriate viscosity of hair dyes, helping the product adhere evenly to the hair without dripping when applied. During the application process, thickeners play a key role in controlling the flow characteristics of the composition and enhancing ease of use and product performance stability.

[0041] Specifically, since powder hair dyes are mixed with water for use, a rapid decrease in viscosity immediately after mixing can cause the product to run off the user's hair. To prevent this, a thickening agent is added to maintain a consistent viscosity; this effectively controls the decrease in viscosity and flowability that may occur during use, thereby minimizing consumer inconvenience.

[0042] The present invention includes a first thickening agent and a second thickening agent. The first thickening agent is a linear polymeric thickening agent that swells and provides viscosity when combined with water, and hydrophilic polymeric compounds such as carboxymethyl cellulose sodium (CMC-Na), guar gum, and sodium polyacrylate are mainly used.

[0043] In particular, sodium carboxymethylcellulose forms a highly viscous gel when dissolved in water, increasing the viscosity of the mixture, while guar gum or xanthan gum swells upon contact with water, maintaining a stable viscosity.

[0044] The second thickener is a thickener that increases viscosity by forming a network structure within the composition through intermolecular or intramolecular bonding when dissolved in water. Xanthan gum or / and gelatin may be used as the second thickener.

[0045] The average particle size of the first thickening agent is preferably 30 μm to 120 μm, and is preferably larger than that of the anti-moisture agent described later. If the above range is exceeded, there is a problem of uneven application to the hair and a decrease in product quality due to uneven application when used, and if the above range is below, it is difficult to apply uniformly due to an excessive increase in initial viscosity, and there is a problem of increased turbidity during the manufacturing process.

[0046] The average particle size of the second thickening agent is preferably 75 μm to 180 μm, and is preferably larger than that of the antihygroscopic agent described later. If the above range is exceeded, it is difficult to achieve uniform viscosity due to the slow dissolution rate when mixed with water, and if the above range is below, there is a possibility of excessive viscosity formation due to rapid initial swelling.

[0047] A dispersant is an additive that improves the performance and usability of a hair dye by ensuring that its components are uniformly mixed and evenly distributed in water. Since hair dyes generally contain various solid components, these ingredients may easily aggregate or clump together when mixed with water immediately before use. In particular, oxidizers, dye precursors, and couplers have limited solubility in water, which can lead to uneven distribution during the mixing process. This can result in uneven color development or a decrease in the product's usability.

[0048] To solve this problem, a dispersant is added. The dispersant adsorbs to the surface of the component particles, preventing aggregation between them and uniformly dispersing the component particles in water. This improves the overall uniformity of the hair dye mixture, increases the spreadability and applicability of the dye, and enables a uniform dyeing effect on the hair.

[0049] Exemplary dispersants primarily utilize solid surface treatment agents such as magnesium stearate. Magnesium stearate imparts hydrophobic properties to the surface of solid particles, thereby preventing them from sticking together and enabling them to disperse stably in water. In addition, various substances such as surfactants can be used as dispersants, and nonionic or anionic surfactants are particularly widely used.

[0050] Moisture-preventing agents are substances added to prevent quality degradation caused by moisture absorption. Since powder hair dyes are stored in powder form, they are sensitive to changes in external humidity and temperature; under these conditions, moisture absorption can easily lead to quality degradation issues such as discoloration, reduced viscosity, and decreased performance. Therefore, moisture-preventing agents play a role in significantly improving storage stability in powder form by protecting key components from the penetration of external moisture through their high hydrophilicity and hygroscopicity, and by minimizing discoloration and the reduction of component reactivity.

[0051] As such antihygroscopic agents, carbohydrate antihygroscopic agents having a molecular weight of 1200 to 10000 Da and being linear or branched oligomers having hydroxyl groups may be used.

[0052] The hydroxyl groups (-OH) present in the molecules of antihygroscopic agents are strong hydrophilic functional groups that can form strong hydrogen bonds with moisture in the surrounding environment. By adsorbing moisture onto the molecular surface and retaining it internally, they play a role in inhibiting additional moisture penetration or movement from the outside. As a result, dextrin controls moisture, thereby minimizing the deterioration or damage to other components caused by moisture.

[0053] Furthermore, because these antihygroscopic agents consist of glucose units continuously linked along with numerous hydroxyl groups, they form a moisture barrier between particles in powder form. This barrier prevents internal components from coming into direct contact with moisture even during rapid changes in external humidity, thereby exhibiting a stabilizing effect that minimizes chemical reactions, discoloration, and deterioration of the components.

[0054] In addition, anti-moisture agents exhibit a certain level of viscosity when in contact with water, because dextrin molecules provide viscosity while stably retaining moisture. Due to this viscosity, dextrin inhibits the free movement of moisture and prevents excessive moisture absorption or release while maintaining the overall viscosity of the product, thereby enhancing the storage stability of the product.

[0055] As a moisture-repellent agent, for example, dextrin or maltodextrin may be preferably used. Dextrin is a low-molecular-weight carbohydrate obtained by enzymatically or thermally hydrolyzing starch.

[0056] These low molecular weight carbohydrate-free moisture-repellent agents initially perform the function of a moisture stabilizer by adsorbing moisture and forming a moisture barrier, but when a large amount of moisture enters, they combine with the moisture to form a viscous solution, enabling them to function as an auxiliary thickener, and it is preferable that the dextrin equivalent (DE) of the moisture-repellent agent be 7.0 to 9.5.

[0057] The antihygroscopic agent has a pass rate of 98% or higher through a 200 mesh, and the average particle size is 20 μm to 75 μm, preferably 20 μm to 75 μm. If the above range is exceeded, the total surface area of ​​the antihygroscopic agent decreases, leading to a decrease in moisture adsorption rate and efficiency. Additionally, the gaps between particles increase, making it difficult to form a uniform moisture barrier, which results in reduced long-term storage stability. If the above range is below, the excessive fine particles cause aggregation between particles to intensify, leading to reduced mixability and increased particle scattering during the manufacturing process.

[0058] Meanwhile, if the surface of the antihypertensive agent is further hydrolyzed using an enzyme such as glucoamylase, the number of hydroxyl groups (-OH) exposed on the surface increases, thereby increasing the interaction (hydrogen bonding) with water. It is desirable to induce faster and more effective moisture adsorption by increasing the density of hydrophilic groups (-OH) on the surface through this treatment.

[0059] In addition, glycerin, polyethylene glycol (PEG), or low molecular weight sugars (trehalose, maltose, etc.) can be thinly coated on the surface of dextrin to enable rapid initial moisture adsorption on the surface and to minimize the gaps between particles, thereby providing a more uniform moisture barrier formation effect.

[0060] Additives may include pH adjusters, skin protectants, excipients, and nutrients.

[0061] pH adjusting agents are additives that play an important role in the chemical stability of hair dyes, dyeing effectiveness, and minimizing scalp irritation during use by adjusting the acidity or alkalinity of the product to a desired level.

[0062] The dyeing reaction of hair dyes generally occurs most efficiently under specific pH conditions; in the case of oxidative hair dyes, the reactivity of dye intermediates and couplers is significantly affected by pH. If the pH is too high or too low, the dye polymerization reaction becomes incomplete, which can reduce the dyeing effect, while excessively alkaline or acidic environments can lead to hair damage or scalp irritation. Therefore, it is essential to establish optimal pH conditions and maintain them stably when manufacturing hair dyes.

[0063] Powdered hair dyes are typically designed to maintain a neutral pH of around 7.0 to minimize irritation to the hair and scalp, and to maintain an optimal balance between dyeing performance and storage stability. Various substances, such as sodium carbonate, sodium bicarbonate, citric acid, phosphoric acid, sodium hydroxide, and hydrochloric acid, are commonly used to adjust this pH.

[0064] In particular, sodium carbonate and sodium bicarbonate are weakly alkaline and are widely used to maintain a slightly alkaline pH, which is effective in enhancing dyeing reactivity while minimizing scalp irritation. On the other hand, weakly acidic substances such as citric acid and phosphoric acid are effectively utilized to maintain an optimal pH range by neutralizing excessively high alkalinity.

[0065] Skin conditioners are functional additives that minimize skin irritation and damage (especially to the scalp) during the dyeing process and protect skin health by maintaining moisture and supplying nutrients.

[0066] Hair dyes contain ingredients that cause strong oxidizing reactions (e.g., oxidizing agents such as sodium percarbonate) for dyeing purposes; when these chemical components come into contact with the scalp, they can cause discomfort or side effects such as skin irritation, dryness, inflammation, and itching. Therefore, it is necessary to add skin-protecting ingredients to hair dye products to minimize such irritation and damage and to protect the skin.

[0067] Seaweed extracts (e.g., kelp powder, Laminaria Japonica Powder), Aloe Vera extract, Glycerin, vegetable oils (argan oil, jojoba oil, etc.), yeast extract, etc. may be used.

[0068] The powder hair dye according to the present invention preferably contains 50 to 60 parts by weight, preferably 55 to 60 parts by weight, of a thickening agent based on 100 parts by weight of an oxidizing agent. If the above range is exceeded, there are problems such as reduced fluidity of the mixture, difficulty in combing during the application process, and hindered uniform application, and if the above range is below, insufficient viscosity is formed, causing the composition to run off the hair during the application process or reduced uniform adhesion, resulting in reduced ease of use and product performance.

[0069] It is preferable that the antihygroscopic agent be included in an amount of 153 to 333 parts by weight based on 100 parts by weight of the oxidizing agent. If the above range is exceeded, the viscosity of the mixture increases rapidly, causing problems such as significantly reduced mixability and fluidity during use, and if the above range is below, long-term storage stability is reduced, and problems such as discoloration or aggregation occur in the powder state.

[0070] It is preferable that the surfactant be included in an amount of 10 to 20 parts by weight, the excipient in an amount of 55 to 400 parts by weight, the intermediate in an amount of 55 to 70 parts by weight, the coupler in an amount of 5 to 20 parts by weight, and the skin protectant in an amount of 10 to 20 parts by weight.

[0071] In particular, it is preferable that the first thickener and the second thickener have a ratio of 1:1 to 2:1. If the first thickener is smaller than the above range, the three-dimensional network structure of the second thickener is excessively formed, resulting in excessively high viscosity and a problem where the viscosity does not decrease appropriately when a shear force is applied, leading to reduced usability during application. If the first thickener is larger than the above range, the linear structural characteristics of the first thickener become dominant, slowing down the initial viscosity development speed and weakening the overall viscosity retention, resulting in a problem where the hair flows down after application or is not applied uniformly.

[0072] In addition, regarding the thickening agent and the moisture-repellent agent, the ratio range of the thickening agent and the moisture-repellent agent in the powder hair dye is 1:2.55 to 1:6.66. If the ratio range is exceeded (i.e., if the moisture-repellent agent is relatively excessive), the initial viscosity of the mixture becomes excessively high, and the fluidity and applicability of the product decrease, making it difficult to apply evenly to the hair and causing discomfort during use. If the ratio range is below the above range (i.e., if the moisture-repellent agent is relatively insufficient), the function of blocking external moisture and absorbing moisture is weakened, resulting in reduced long-term storage stability in the powder state and quality degradation issues such as discoloration or clumping over time.

[0073] When mixed with water, the viscosity varies depending on user preference and the degree of dyeing, but a value of 1,500 to 2,000 cps is desirable. (Based on a Brookfield viscometer measured at 25 ℃)

[0074] <Example>

[0075] Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Sodium percarbonate 15.00 15.00 15.00 15.00 15.00 15.00 15.00 DEXTRIN(particle size,um)(DE) 23.00(25)(8) 23.00(75)(8) 23.00(55)(8) 50.00(55)(8) 33.00(70)(8) 0.00 23.00(100)(8) Cellulose Gum 4.90 8.80 4.90 4.90 4.90 4.90 Xanthan Gum 3.40 8.80 3.40 3.40 3.40 3.40 Laminaria Japonica Powder 2.50 2.00 2.50 2.50 2.50 2.50 2.50 Magnesium Stearate 2.00 2.00 2.00 2.00 2.00 2.00 2.00 Disodium lauryl sulfosuccinate 2.50 2.50 2.50 2.50 2.50 2.50 2.50 Sodium sulfate anhydrous 35.44 35.44 34.94 8.44 25.44 58.44 35.44 Saccharomyces Cerevisiae Extract 0.00 0.00 0.00 0.00 0.00 0.00 0.00 m-Aminophenol Sulfate 1.12 1.12 1.12 1.12 1.12 1.12 1.12 p-Aminophenol Sulfate 0.28 0.28 0.28 0.28 0.28 0.28 0.28 Resorcinol 1.60 1.60 1.60 1.60 1.60 1.60 1.60 4-Amino-2-Hydroxytoluene 0.06 0.06 0.06 0.06 0.06 0.06 0.06 Toluene-2,5-diamine Sulfate 8.20 8.20 8.20 8.20 8.20 8.20 8.20 total 100.00 100.00 100.00 100.00 100.00 100.00 100.00

[0077] <Experimental Example>

[0078] Usability (combing) upon application Mixability liquidity Hair texture after dyeing Long-term storage Example 1 5 5 5 5 5 Example 2 3 4 3 3 4 Example 3 4 4 4 4 4 Example 4 5 5 5 5 5 Example 5 5 5 4 5 5 Comparative Example 1 3 3 3 3 2 Comparative Example 2 5 5 5 5 2

[0079] Examples 1, 4, and 5 recorded high scores in coatability, mixability, fluidity, tactile feel after dyeing, and long-term storage, with 5 points being the highest score and 1 point the lowest. Examples 2 and 3 showed relatively lower scores in some categories due to the omission of one of the thickening agents, but still demonstrated generally good results. Comparative Example 1 received a low evaluation, particularly in long-term storage and usability, as it lacked an anti-moisture agent.

[0080] The features, structures, effects, etc. exemplified in each of the aforementioned embodiments may be combined or modified and implemented in other embodiments by a person skilled in the art to which the embodiments belong. Therefore, details regarding such combinations and modifications should be interpreted as being included within the scope of the present invention.

Claims

Claim 1 A powder hair dye composition comprising an oxidizing agent, an intermediate, and a coupler, and used by mixing with water, wherein the thickening agent is included in an amount of 55 to 60 parts by weight per 100 parts by weight of the oxidizing agent; and a hygroscopic agent is included in an amount of 153 to 333 parts by weight per 100 parts by weight of the oxidizing agent, has a molecular weight of 1200 to 10000 Da, and has a linear or branched oligomer carbohydrate having a hydroxyl group. Claim 2 A powder hair dye composition according to claim 1, wherein the moisture-repellent agent is dextrin and / or maltodextrin. Claim 3 In claim 1, the moisture-repellent agent is a powder hair dye composition having a DE value of 7.0 to 9.

5. Claim 4 In claim 1, the moisture-repellent agent is a powder hair dye composition whose surface is hydrolyzed using enzymes. Claim 5 In claim 1, the powder hair dye composition coated with one selected from the group consisting of glycerin, polyethylene glycol (PEG), trehalose, and maltose. Claim 6 A powder hair dye composition according to claim 1, wherein the thickener comprises a first thickener having a linear polymer structure that swells and provides viscosity when combined with water. Claim 7 A powder hair dye composition according to claim 6, further comprising a second thickening agent that provides viscosity by forming a three-dimensional network structure when combined with water. Claim 8 In claim 7, the powder hair dye composition wherein the first thickener and the second thickener are in a ratio of 1:1 to 2:

1. Claim 9 In claim 1, the oxidizing agent is a powder hair dye composition comprising sodium percarbonate (Na₂CO₃·1.5H₂O₂). Claim 10 In claim 6, the powder hair dye composition wherein the first thickening agent is one or more selected from the group consisting of sodium carboxymethylcellulose (CMC-Na), guar gum, and sodium polyacrylate. Claim 11 In claim 7, the powder hair dye composition wherein the second thickener is xanthan gum and / or gelatin. Claim 12 In claim 1, the powder hair dye composition further comprises a pH adjuster providing a pH in the range of 6.5 to 7.

5. Claim 13 The powder hair dye composition according to claim 1 further comprises at least one skin protectant selected from the group consisting of yeast extract, seaweed extract, aloe vera extract, glycerin, and vegetable oil. Claim 14 A powder hair dye composition according to claim 1, wherein the viscosity of the powder hair dye composition when used in water is 1,500 to 2,000 cps.