Oxidative hair dye composition

Abstract

This invention relates to an oxidative hair dye composition and a hair dye comprising the oxidative hair dye composition, the oxidative hair dye composition comprising: a first agent containing an oil and an oxidative dye; and a second agent containing an oxidant. The hair dye composition of this invention contains an oil in the first agent to prevent the oxidative dye from contacting oxygen, thereby inhibiting oxidation and providing excellent color retention, conditioning, and scalp protection effects.

Description

Technical Field

[0001] The present invention relates to an oxidative hair dye composition and a hair dye comprising the oxidative hair dye composition, the oxidative hair dye composition comprising: a first agent containing an oil and an oxidative dye; and a second agent containing an oxidant. Background Technology

[0002] Recently, with the improvement of living standards, people's interest in beauty has grown stronger, and hair dyeing, which can express individuality, has become more and more popular.

[0003] In hair dyes used for coloring hair, oxidative hair dye compositions typically contain one or more oxidative dye intermediates and one or more coupling agents (first agent), and are mixed with an oxidizing agent (second agent) such as hydrogen peroxide solution before being applied to the hair to carry out the coloring. The purpose of using this type of hair dye is to color the hair as thoroughly as possible and to maintain the coloring effect for a long time.

[0004] Existing hair dye compositions are generally formed in a single dosage form such as gel, cream, or liquid. However, cream formulations are inconvenient to use because they require a separate tool such as a brush to apply evenly to the hair, while liquid formulations are also inconvenient to use because the liquid may drip onto the skin or contaminate the surrounding area during the dyeing process.

[0005] Oxidative hair dye compositions typically involve mixing a first agent and a second agent before applying the mixture to the hair for coloring. The first agent contains one or more oxidative dye precursors and one or more coupling agents, alkaline agents, antioxidants, and reducing agents, while the second agent contains hydrogen peroxide, etc. However, the first agent contains an oxidative dye, which oxidizes rapidly, and the alkaline agent in the first agent and the hydrogen peroxide in the second agent can cause scalp irritation and hair damage. Research to address these issues is actively underway. For example, methods using silicones and cationic polymers to enhance hair care effects have been investigated. However, silicones can harm the environment and biodiversity and can accumulate on the scalp, potentially damaging scalp health. Cationic polymers can also cause scalp itching and irritation. Therefore, there is an urgent need to develop a novel hair dye that can maintain the coloring effect while preventing hair damage.

[0006] Korean Patent Publication No. 10-2020-0011674 discloses a hair dye additive composition containing coconut flower sugar, shrimp powder and kelp powder, but does not disclose separately the composition for preventing the oxidation of the first agent itself.

[0007] Against this backdrop, the inventors devoted themselves to research and development of a hair dye that can care for hair, prevent damage, and protect the scalp. Ultimately, they proved that when a hair dye composition is prepared using a first agent containing oil and consisting of two layers, oxidation can be inhibited, and scalp irritation can be alleviated when the hair dye composition is used for dyeing, thus completing the present invention. Summary of the Invention

[0008] Technical issues The purpose of this invention is to solve the above-mentioned problems and other related problems.

[0009] An exemplary object of the present invention is to provide an oxidative hair dye composition comprising: a first agent comprising an oil and an oxidative dye; and a second agent comprising an oxidant.

[0010] Another exemplary object of the present invention is to provide a hair dye comprising the said oxidative hair dye composition.

[0011] Based on the inventive concept disclosed in this specification, the technical problem to be solved is not limited to the problem mentioned above. Other unmentioned problems can be clearly understood by those skilled in the art from the following description.

[0012] Technical solutions The specific description of the present invention is as follows. Furthermore, the various descriptions and embodiments disclosed in this application are also applicable to every other description and embodiment. That is, all combinations of the various elements disclosed in this application fall within the scope of this application. Moreover, the scope of this application should not be considered limited to the specific descriptions described below.

[0013] As part of achieving the stated purpose, the present invention provides an oxidative hair dye composition comprising: a first agent comprising an oil and an oxidative dye; and a second agent comprising an oxidant.

[0014] In this invention, the first agent may be formed of multiple layers, including an upper layer containing the oil and a lower layer formed below the upper layer and containing the oxidizing dye.

[0015] As an embodiment of the present invention, the first agent may be formed of two layers, the two layers including an upper layer containing the oil and a lower layer containing the aqueous phase of the oxidizing dye.

[0016] Traditional hair dyes contain oxidizing dyes that are easily oxidized in air, thus requiring the inclusion of antioxidants and / or reducing agents to prevent this. Furthermore, conventional hair dyes are not only complex but also costly because nitrogen is required to fill the container with the dye. In contrast, this invention places an oil above the aqueous phase of the first agent. This oil prevents oxygen from contacting the oxidizing dye, thereby inhibiting oxidation and eliminating the need for a separate nitrogen filling process, resulting in a simpler and more economical preparation process.

[0017] In this invention, the oil may be one or more selected from the group consisting of ester oils, hydrocarbon oils, silicone oils and vegetable oils.

[0018] In this invention, the ester oil may be cetyl ethylhexanoate, dioctyl carbonate, isopropyl myristate, isopropyl palmitate, caprylic / capric triglyceride, triethylhexanoate, coconut caprylate / capric ester, isoamyl laurate, C 12-15 Alkyl benzoate, trivalerate, neovalerate, neopentyl glycol diheptate, PEG-7 glyceryl cocoate, PEG-7 caprylic / capric glyceride, ethylhexyl palmitate, cetyl palmitate, dioctyl carbonate or cetyl ethylhexyl ester.

[0019] In this invention, the hydrocarbon oil may be mineral oil, squalane, hydrogenated polydecene, undecane, tridecane, polybutene, hydrogenated polybutene, or C. 13-15 Alkanes.

[0020] In this invention, the silicone oil may be polydimethylsiloxane, cyclopentasiloxane, cyclohexylsiloxane, diphenylsiloxyphenyltrimethylsiloxane, phenyltrimethylsiloxane, or octylpolymethylsiloxane.

[0021] In this invention, the vegetable oil may be sweet almond oil, corn oil, soybean oil, rapeseed oil, cottonseed oil, coconut oil, apricot kernel oil, castor oil, meadowfoam seed oil, grape seed oil, macadamia seed oil, olive oil, sunflower seed oil, jojoba seed oil, argan oil, avocado oil, green tea seed oil, evening primrose oil, camellia seed oil, baobab seed oil, orange seed oil, flaxseed oil, or Brazil nut seed oil.

[0022] In this invention, based on a total of 100 parts by weight of the first agent, the oil may contain 5 or more parts by weight, specifically 8 or more parts by weight, and more specifically 10 or more parts by weight.

[0023] As an embodiment of the present invention, based on a total of 100 parts by weight of the first agent, the oil may contain 5 parts by weight to less than 30 parts by weight, specifically 5 parts by weight to 25 parts by weight, and more specifically 5 parts by weight to 20 parts by weight.

[0024] If the oil content is less than 5 parts by weight relative to the total 100 parts by weight of the first agent, it cannot completely block air contact and thus cannot prevent oxidation. If the oil content is more than 30 parts by weight, the proportion of oil is too high, and the separation speed of the first agent may be very slow.

[0025] Specifically, in the embodiments of the present invention, it was confirmed that when the first agent containing 30% or 40% oil was left for 24 hours, the stratification did not proceed smoothly; however, when the oil content was less than 30%, the stratification proceeded smoothly.

[0026] In this invention, the first agent may comprise a surfactant.

[0027] In this invention, the HLB value (Hydrophile-Lipophile Balance) of the surfactant can be 10 to 30, more specifically 10 to 25, and even more specifically 10 to 21.

[0028] Specifically, in the embodiments of the present invention, it has been confirmed that when the HLB value of the surfactant contained in the first agent is 10 or above, the layering of the first agent can proceed smoothly at an appropriate speed; however, when the HLB value is 3.7, 4.9 or 8, the layering is slow or the water-soluble dye decomposes, and the layer ratio is uneven.

[0029] In this invention, the surfactant may contain 0.1 to 1.5 parts by weight relative to the total 100 parts by weight of the first agent, specifically 0.3 to 1.5 parts by weight.

[0030] Specifically, in the embodiments of the present invention, the following results were confirmed: when the first agent contained 0.3%, 0.8%, 0.5%, and 1% surfactant, respectively, the stratification proceeded smoothly; however, when no surfactant was contained, problems of uneven interface and rough surface occurred; and when 2% surfactant was contained, no stratification occurred.

[0031] In this invention, the surfactant may be selected from any one or more of anionic surfactants, nonionic surfactants, cationic surfactants and amphoteric surfactants.

[0032] In this invention, the anionic surfactant may be selected from any one or more of the following: sodium lauryl ether sulfate, sodium lauryl sulfate, ammonium lauryl ether sulfate, ammonium lauryl sulfate, isopropanolamine (MIPA)-lauryl ether sulfate, potassium cocoyl glycinate, disodium lauryl ether sulfosuccinate, sodium cocoyl hydroxyethyl sulfonate, C 14-16 Sodium olefin sulfonate, sodium cocoyl glycinate, sodium lauroyl glutamate, sodium cocoyl alanine, sodium methyl cocoyl taurate, and sodium lauroyl methyl aminopropionate.

[0033] In this invention, the nonionic surfactant may be selected from any one or more of the following: sorbitan sesquioleate, cocoeth-7, polypropylene glycol (PPG)-1-polyethylene glycol (PEG)-9-lauryl glycol ether, PEG-40 hydrogenated castor oil, PEG-60 hydrogenated castor oil, polysorbate 20, polysorbate 60, polysorbate 80, octyldodecyl polyether-5, octyldodecyl polyether-25, decyl glucoside, oleyl alcohol polyether-2, oleyl alcohol polyether-5, and oleyl alcohol polyether-10.

[0034] In this invention, the cationic surfactant may be selected from any one or more of the following: hexadecyltrimethylammonium chloride, lauryltrimethylammonium chloride, behenyltrimethylammonium chloride, dicosyldimethylammonium chloride, hexadecyltrimethylammonium methyl sulfate, behenyltrimethylammonium methyl sulfate, and stearyltrimethylammonium chloride.

[0035] In this invention, the amphoteric surfactant may be selected from any one or more of the following: coco-betaine, disodium cocoamphodiacetate, cocamidopropyl betaine, lauryl betaine, cocamidopropyl hydroxysulfonate betaine, and cocamide MIPA.

[0036] In this invention, the oxidizing dye may be selected from any one or more of the following: p-nitro-o-phenylenediamine, 2-amino-4-nitrophenol, 2-amino-5-nitrophenol, 2-amino-3-hydroxypyridine, 5-amino-o-cresol, m-aminophenol, o-aminophenol, p-aminophenol, 2,4-diaminophenoxyethanol hydrochloride, toluene-2,5-diamine hydrochloride, m-phenylenediamine hydrochloride, p-phenylenediamine hydrochloride, hydroxypropyl bis(N-hydroxyethyl-p-phenylenediamine) hydrochloride, toluene-2,5-diamine, p-phenylenediamine, N-phenyl-p-phenylenediamine, picric acid, p-nitro-o-phenylenediamine sulfate, p-methylaminophenol sulfate, 5- Amino-o-cresol sulfate, m-aminophenol sulfate, o-aminophenol sulfate, p-aminophenol sulfate, toluene-2,5-diamine sulfate, m-phenylenediamine sulfate, p-phenylenediamine sulfate, N,N-bis(2-hydroxyethyl)-p-phenylenediamine sulfate, 2,6-diaminopyridine, 2,4-diaminophenol hydrochloride, 1,5-dihydroxynaphthalene, sodium pyrogallol, 2-amino-5-nitrophenol sulfate, o-chloro-p-phenylenediamine sulfate, 1-hydroxyethyl-4,5-diaminopyrazole sulfate, hydroxybenzomorpholine, 6-hydroxyindole, α-naphthol, resorcinol, 2-methylresorcinol, gallic acid, catechol, and pyrogallol.

[0037] In this invention, the oxidizing dye may be 0.001 parts by weight to 5 parts by weight relative to the total 100 parts by weight of the first agent.

[0038] In this invention, the first agent may further include a coupling agent.

[0039] The coupling agent may be selected from any one or more of the following: 2-methyl-5-hydroxyethylaminophenol, p-amino-o-cresol, m-aminophenol, 2,4-diaminophenoxyethanol hydrochloride, m-phenylenediamine hydrochloride, m-phenylenediamine, N-methyl-p-phenylenediamine, p-amino-o-cresol sulfate, 4-ethoxy-m-phenylenediamine sulfate, m-phenylenediamine sulfate, α-naphthol, resorcinol, and 2-methylresorcinol.

[0040] In this invention, the coupling agent may be 0.001 parts by weight to 5 parts by weight relative to the total 100 parts by weight of the first agent.

[0041] In this invention, the first agent may further include an alkaline agent.

[0042] The alkaline agent may be selected from any one or more of the following: ammonia, monoethanolamine, triethanolamine, arginine, aminomethylpropanol, sodium hydroxide, potassium hydroxide, ammonium bicarbonate, sodium bicarbonate, and sodium carbonate.

[0043] In this invention, the alkaline agent may be 0.01 to 20 parts by weight relative to the total 100 parts by weight of the first agent.

[0044] In this invention, the first agent may further comprise a metal ion chelating agent, an antioxidant, and / or a care agent.

[0045] In this invention, the metal ion chelating agent may be selected from any one or more of the following: ethylenediaminetetraacetic acid (EDTA), disodium ethylenediaminetetraacetic acid (EDTA-2NA), trisodium ethylenediaminetetraacetic acid (EDTA-3NA), tetrasodium ethylenediaminetetraacetic acid (EDTA-4NA), tetrasodium hydroxyethylidene diphosphonate, hydroxyethylidene diphosphonic acid, pentasodium diethylenetriaminepentaacetic acid, sodium stannate, and tetrasodium pyrophosphate.

[0046] In this invention, the metal ion chelating agent may be 0.01 to 1 part by weight relative to the total 100 parts by weight of the first agent.

[0047] In this invention, the antioxidant may be one or more selected from ascorbic acid, isoascorbic acid, sodium sulfite, cysteine, cysteine ​​hydrochloride, thioglycolate, and thioglycolic acid.

[0048] In this invention, the antioxidant may be 0.01 to 2 parts by weight relative to the total 100 parts by weight of the first agent.

[0049] In this invention, the care agent may be one or more selected from cellulose-based thickeners, cationic polymers, and polyols.

[0050] In this invention, the second agent may further include solvents, thickeners, pH adjusters, oxidants, conditioning agents and / or metal ion chelating agents.

[0051] In this invention, the thickener may be selected from carbomer, acrylate / behenol polyether-25 methacrylate copolymer, acrylate / cetyl alcohol polyether-20 itaconic acid copolymer, and acrylate / C 10 - 30 Any one or more of the alkyl acrylate crosslinking polymers.

[0052] In this invention, the thickener may be 1 to 10 parts by weight relative to the total 100 parts by weight of the second agent.

[0053] In this invention, the pH adjuster may be one or more selected from disodium hydrogen phosphate, phosphoric acid, and salicylic acid.

[0054] In this invention, the pH adjuster may be 0.01 to 5 parts by weight relative to the total 100 parts by weight of the second agent.

[0055] In this invention, the oxidant may be hydrogen peroxide, but is not limited thereto.

[0056] In this invention, the oxidant may be 2.5 to 12 parts by weight relative to the total 100 parts by weight of the second agent.

[0057] In this invention, the care agent may be one or more selected from cellulose-based thickeners, cationic polymers, and polyols.

[0058] In this invention, the metal ion chelating agent may be selected from one or more of the following: EDTA, EDTA-2NA, EDTA-3NA, EDTA-4NA, tetrasodium hydroxyethylidene diphosphonate, hydroxyethylidene diphosphonic acid, pentasodium diethylenetriaminepentaacetate, sodium stannate, and tetrasodium pyrophosphate.

[0059] In this invention, the metal ion chelating agent may be 0.01 to 1 part by weight relative to the total 100 parts by weight of the second agent.

[0060] As another aspect for achieving the stated purpose, the present invention provides a hair dye comprising the oxidative hair dye composition.

[0061] In this invention, the hair dye may be one or more dosage forms selected from the group consisting of creams, gels, liquids, powders, aerosols and emulsions.

[0062] The effects of the invention The hair dye composition of the present invention contains oil in the first agent to prevent the oxidizing dye from coming into contact with oxygen, thereby inhibiting oxidation and providing excellent color retention, conditioning and scalp protection effects. Attached Figure Description

[0063] Figure 1 The results of the stratification caused by the presence or absence of oil were confirmed by visual observation after 24 hours and 7 days following the preparation of the first agent of the present invention (Comparative Example 3 and Example 1).

[0064] Figure 2 The results were obtained by visual observation after 0 hours, 0.5 hours, and 12 hours following the preparation of the first agent of the present invention (Comparative Examples 4 to 6, Example 10, Example 12, and Example 13), to confirm the stratification rate corresponding to the HLB value of the surfactant.

[0065] Figure 3 The results of the stratification rate corresponding to the surfactant content were confirmed by visual observation 24 hours after the preparation of the first agent of the present invention (Comparative Example 1, Comparative Example 2, Example 1, Example 8, Example 9, Example 10).

[0066] Figure 4 The result was obtained by visual observation 24 hours after the preparation of the first agent of the present invention (Comparative Example 3, Example 1, Example 2, Example 3, Example 11) to confirm the stratification rate corresponding to the type of oil.

[0067] Figure 5 The results of visual observation were obtained 24 hours after the preparation of the first agent of the present invention (Comparative Example 3, Example 1, Example 4 to Example 7) to confirm the stratification rate corresponding to the oil content.

[0068] Figure 6 This confirms the scalp protection effect of hair dye compositions prepared by respectively containing the first agent of the present invention (Comparative Example 3, Example 1). Detailed Implementation

[0069] The present invention will be described in more detail below through the following embodiments. However, these embodiments are for illustrative purposes only, and the scope of the present invention is not limited to these embodiments.

[0070] Example 1: Preparation of hair dye composition.

[0071] 1-1. Preparation of the first agent.

[0072] The first agent containing oil was prepared according to the composition ratios in Tables 1 and 2 below (Examples 1 to 13). As a surfactant, PEG-40 hydrogenated castor oil (cocoyl alcohol polyether-7, PPG-1-PEG-9-lauryl glycol ether, PEG-40 hydrogenated castor oil), cetyltrimethylammonium chloride, sodium lauryl ether sulfate, disodium cocoamphodiacetate, sorbitan sesquioleate, or oleyl alcohol polyether-2 was used; as an oil, mineral oil, cetyl ethylhexanoate, sweet almond oil, or polydimethylsiloxane was used.

[0073] Table 1

[0074] * Indicates weight relative to 100 parts by weight of the first dose.

[0075] Table 2

[0076] * Indicates weight relative to 100 parts by weight of the first dose.

[0077] In addition, Comparative Examples 1 to 6 were prepared by changing the composition ratio as shown in Table 3 below.

[0078] Table 3

[0079] * Indicates weight relative to 100 parts by weight of the first dose.

[0080] 1-2. Prepare the second agent.

[0081] The second agent was prepared according to the composition ratios in Table 4 below (Examples 14 to 16). Specifically, xanthan gum, carbomer, acrylate / cetyl ether-20 itaconic acid copolymer, and acrylate / C10-30 alkyl acrylate crosspolymer were added to purified water and stirred with an Agi stirrer. Then, propylene glycol, disodium ethylenediaminetetraacetate, hydroxyethylidene diphosphonic acid, disodium hydrogen phosphate, and phosphoric acid were added, and the mixture was heated to 78°C to dissolve. The mixture was then cooled to 40°C, hydrogen peroxide was added, and the mixture was stirred to prepare the second agent.

[0082] Table 4

[0083] * Indicates weight relative to 100 parts by weight of the second dose.

[0084] 1-3. Preparation of hair dye composition.

[0085] The first agent (Example 1) and the second agent (Examples 14 to 16) were mixed at a weight ratio of 1:1, and the viscosity was measured using a Brookfield LVDV-II+Pro viscometer (64 rotor, 12 rpm, 1 minute). The results are shown in Table 5.

[0086] Table 5

[0087] In addition, by changing the combination of the first agent (Examples 1 to 13) and the second agent (Examples 14 to 16) and mixing them at a weight ratio of 1:1, an oxidative hair dye composition was prepared and used to evaluate the following effects on color retention, conditioning, hair care and scalp protection.

[0088] Example 2: Evaluation of the oxidizing power and stratification of the first agent.

[0089] 2-1. Oxidizing power assessment.

[0090] The first-agent compositions of Example 1 and Comparative Example 3 were opened and left at room temperature for 24 hours or one week, respectively, and then the color intensity was visually confirmed. Example 1 contained mineral oil, while Comparative Example 3 was an oil-free first-agent composition.

[0091] The results confirmed that after one week, the color of Comparative Example 3 was darker than that of Example 1. Figure 1 This indicates that the oil layer in the composition of Example 1 is located above the aqueous phase containing the dye, thereby blocking oxygen from the air and preventing the dye from oxidizing. That is, the two-phase hair dye composition containing an oil phase (oil layer) above the aqueous phase was evaluated as having an oxidation-inhibiting effect on the dye even without nitrogen filling, and not only has long-term storage stability, but is also economical and practical because it does not require packaging.

[0092] 2-2. Evaluate the stratification rate corresponding to the HLB value of the surfactant.

[0093] Comparative Examples 4 to 6, Example 10, Example 12, and Example 13, each with different HLB values ​​(Hydrophile-Lipophile Balance), were placed at room temperature using different surfactants, and the stratification at different times (0 hours, 0.5 hours, and 12 hours) was observed visually.

[0094] Based on the difference in HLB values, the separation rate is compared. The suitable separation point for mass production is when gradual separation begins about 1 hour after manufacturing and complete separation and maintenance occur after 12 hours.

[0095] As a result, in Comparative Example 4, which used dehydrated sorbitan sesquioleate (HLB 3.7) as a surfactant, the separation rate was too slow; in Comparative Example 5, which used oleyl alcohol polyether-2 (HLB 4.9), the water-soluble dye decomposed when emulsified into the oil layer; and in Comparative Example 6, which used disodium cocoamphoacetate (HLB 8), separation began rapidly in less than 0.5 hours after standing, indicating that the interlayer ratio of the products may be uneven during the product filling process. On the other hand, in Example 10, which used PEG-40 hydrogenated castor oil (HLB 13.1) as a surfactant, Example 12, which used hexadecyltrimethylammonium chloride (HLB 21), and Example 13, which used sodium lauryl ether sulfate (HLB 10.4), suitable separation rates were observed. Figure 2 ).

[0096] 2-3. Evaluate the stratification rate corresponding to the surfactant content.

[0097] The effect of the surfactant content in the first agent on the separation was confirmed. The separation results of the following samples were compared after 24 hours of incubation: i) Comparative Example 1 without surfactant, ii) Comparative Example 2 containing 2% surfactant, iii) Example 1 containing 0.5% surfactant, iv) Example 8 containing 0.3% surfactant, v) Example 9 containing 0.8% surfactant, and vi) Example 10 containing 1% surfactant. This confirmed that separation in Examples 1, 8, 9, and 10 proceeded smoothly. On the other hand, the following results were observed: Comparative Example 1 without surfactant immediately separated, resulting in an uneven interface and a rough surface; while Comparative Example 2 containing 2% surfactant showed almost no separation (Figure 3).

[0098] 2-4. Assess the stratification rate corresponding to the type and content of oil.

[0099] Comparative Example 3, Example 1 (using mineral oil), Example 2 (using cetyl ethylhexanoate), Example 3 (using sweet almond oil), and Example 11 (using polydimethylsiloxane), which contain different types of oils, were left at room temperature for 24 hours, and the degree of separation was observed visually.

[0100] As a result, Comparative Example 3, which did not contain oil, did not exhibit stratification, confirming that stratification was achieved in Examples 1, 2, 3, and 11. However, it was confirmed that in Example 3, the oil had slightly lower polarity, thus partially emulsifying in the aqueous phase and exhibiting turbidity. Figure 4 ).

[0101] In addition, the degree of separation was compared after Comparative Example 3, Example 4 (oil content 5%), Example 1 (oil content 10%), Example 5 (oil content 20%), Example 6 (oil content 30%), and Example 7 (oil content 40%), which had different oil contents, were placed at room temperature for 24 hours.

[0102] As a result, poor stratification was observed in Examples 6 and 7, which had high oil content. Figure 5 ).

[0103] Example 3: Evaluation of the color retention and hair protection effect of the oxidative hair dye composition.

[0104] 3-1. Color fastness (color retention) assessment.

[0105] The hair dye composition prepared using Comparative Example 3 (oil-free) as the first agent, the hair dye compositions prepared using Examples 1 to 7 and Example 11 (containing oil), and the second agent prepared using Example 14 were mixed at a 1:1 ratio and applied evenly to experimental hair samples. The mixtures were left for 30 minutes and then rinsed with shampoo and running water. Subsequently, the color of hair dried with a hairdryer and hair repeatedly washed with shampoo five times were measured using a spectrophotometer (Konica Minolta CM-5) to assess color retention (color fastness).

[0106] The results show that the larger the positive value of *a*, the closer the color is to red; the larger the negative value of *a*, the closer the color is to green. Similarly, the larger the positive value of *b*, the closer the color is to yellow; the larger the negative value of *b*, the closer the color is to blue. The ΔE*ab value is the standard deviation of the measured color from the standard color; a larger value indicates a greater color change, and a smaller value indicates a smaller color change.

[0107] Colorfastness was compared using ΔE*ab values ​​measured with a spectrophotometer (Konica Minolta CM-5). Hair that had been shampooed once and dried was used as the standard value. The ΔE*ab values ​​of hair that had been shampooed five times were measured three times to obtain the average ΔE*ab value.

[0108] The smaller the ΔE*ab value, the smaller the color change and the better the staining retention.

[0109] By comparing color fastness, it was confirmed that the color retention of Examples 1 to 7 and Example 11 was significantly superior (Table 6).

[0110] Table 6

[0111] 3-2. Nursing effectiveness assessment.

[0112] The conditioning effects of the hair dye compositions prepared using the first agent of Comparative Example 3, Examples 1 to 7, and Example 11 were measured. Specifically, the friction force of 1.5 grams of test hair with a length of 100 mm was measured using a coefficient of friction tester (Neo-Tribo (FCMS 170)). The hair dye compositions containing Comparative Example 3, Examples 1 to 7, and Example 11 were then evenly applied to the same hair. After drying the hair, the friction force was measured again using the coefficient of friction tester (Neo-Tribo (FCMS 170)). A lower average coefficient of friction indicates a better hair conditioning effect.

[0113] As shown in Table 7, the coefficient of friction values ​​of Examples 1 to 7 and Example 11 containing oil were lower than those of Comparative Example 3 which did not contain oil, confirming that when the hair dye composition contains oil, it exhibits a superior care effect compared to the oil-free case.

[0114] Table 7

[0115] 3-3. Evaluation of hair care effects.

[0116] The hair-growth effects of Comparative Example 3, Example 1, Examples 3 to 5, and Example 7 (first application) were evaluated. Hair-growth effect refers to the indicator of thicker, healthier hair growth. The hair dye compositions prepared in each experimental group were applied to hair samples and allowed to dry. The samples were then exposed to constant light, and the gloss bands formed by light scattering on the hair surface were photographed and analyzed for evaluation. The gloss bands were extracted from the photographed images using an analysis program, and the pixel value of the gloss band area relative to the total area was calculated. This indicates that as the gloss band area increases, the gloss also increases.

[0117] The results, shown in Table 8, confirm that the gloss band area in Examples 1, 3, 5, and 7, which contain 10% to 40% oil, is significantly increased compared to Comparative Example 3, which does not contain oil. However, Example 4, with an oil content of 5%, exhibits a similar area value to Comparative Example 3.

[0118] Table 8

[0119] 3-4. Evaluation of scalp protection effect.

[0120] Ten adult men and women without skin diseases were selected as subjects. 20 µl of each of the hair dye composition of Comparative Example 3 and the hair dye composition of Example 1 were applied to the skin of the arm area, then fixed with an ECODERM IQ Ultra patch applicator and left for 8 hours.

[0121] The experimenters conducted a visual assessment based on the following criteria (Table 9) that reflect the guidelines of the Frosch & Kligman method and the Cosmetic, Toiletry, and Fragrance Association (CTFA) (* Four patients were excluded from the experiment due to contact dermatitis at the patch contact site).

[0122] Table 9

[0123] The results confirmed that when the first agent containing oil (Example 1) was used, its irritation level was lower than that of the first agent without oil (Comparative Example 3), and it was effective in relieving skin irritation. Figure 6 Based on the above description, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing its technical concept or essential features. In this regard, the embodiments described above should be understood in all respects as exemplary, not restrictive. The scope of the present invention should be interpreted as including all modifications or variations derived from the meaning and scope of the following claims and equivalent concepts, rather than the detailed description above.

Claims

1. An oxidative hair dye composition, comprising: The first agent containing oil and oxidizing dyes; as well as A second agent containing an oxidizing agent.

2. The oxidative hair dye composition according to claim 1, in, The first agent is formed of multiple layers, including an upper layer containing the oil and a lower layer formed below the upper layer and containing the oxidizing dye.

3. The oxidative hair dye composition according to claim 1, in, The oil is selected from one or more of the group consisting of ester oils, hydrocarbon oils, silicone oils, and vegetable oils.

4. The oxidative hair dye composition according to claim 1, in, Based on a total of 100 parts by weight of the first agent, the oil contains 5 parts by weight to less than 30 parts by weight.

5. The oxidative hair dye composition according to claim 1, in, The first agent contains a surfactant.

6. The oxidative hair dye composition according to claim 5, in, The surfactant has a hydrophilic-lipophilic balance (HLB value) of 10 to 30.

7. The oxidative hair dye composition according to claim 5, in, Based on a total of 100 parts by weight of the first agent, the surfactant comprises 0.1 to 1.5 parts by weight.

8. A hair dye comprising the oxidative hair dye composition as described in claim 1.

9. The hair dye according to claim 8, in, The hair dye is selected from one or more dosage forms of the group consisting of creams, gels, liquids, powders, aerosols and emulsions.

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