CN112826758A - Set for depigmenting hair - Google Patents

Set for depigmenting hair Download PDF

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Publication number
CN112826758A
CN112826758A CN202011340186.7A CN202011340186A CN112826758A CN 112826758 A CN112826758 A CN 112826758A CN 202011340186 A CN202011340186 A CN 202011340186A CN 112826758 A CN112826758 A CN 112826758A
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agent
hair
acid
kit
depigmenting
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Granted
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CN112826758B (en
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朴宰正
文孝丞
金种夹
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Amorepacific Corp
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Amorepacific Corp
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/40—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing nitrogen
    • A61K8/44—Aminocarboxylic acids or derivatives thereof, e.g. aminocarboxylic acids containing sulfur; Salts; Esters or N-acylated derivatives thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
    • A61K8/23—Sulfur; Selenium; Tellurium; Compounds thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
    • A61K8/34—Alcohols
    • A61K8/347—Phenols
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/40—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing nitrogen
    • A61K8/44—Aminocarboxylic acids or derivatives thereof, e.g. aminocarboxylic acids containing sulfur; Salts; Esters or N-acylated derivatives thereof
    • A61K8/447—Aminocarboxylic acids or derivatives thereof, e.g. aminocarboxylic acids containing sulfur; Salts; Esters or N-acylated derivatives thereof containing sulfur
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/46—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing sulfur
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
    • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
    • A61K8/67—Vitamins
    • A61K8/676—Ascorbic acid, i.e. vitamin C
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q5/00—Preparations for care of the hair
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q5/00—Preparations for care of the hair
    • A61Q5/06—Preparations for styling the hair, e.g. by temporary shaping or colouring
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q5/00—Preparations for care of the hair
    • A61Q5/10—Preparations for permanently dyeing the hair
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D2200/00—Details not otherwise provided for in A45D
    • A45D2200/25—Kits
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
    • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
    • A61K2800/42—Colour properties
    • A61K2800/43—Pigments; Dyes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
    • A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
    • A61K2800/51—Chelating agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
    • A61K2800/80—Process related aspects concerning the preparation of the cosmetic composition or the storage or application thereof
    • A61K2800/88—Two- or multipart kits
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
    • A61K2800/80—Process related aspects concerning the preparation of the cosmetic composition or the storage or application thereof
    • A61K2800/88—Two- or multipart kits
    • A61K2800/882—Mixing prior to application

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Birds (AREA)
  • Epidemiology (AREA)
  • Emergency Medicine (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Cosmetics (AREA)

Abstract

The present invention relates to a kit for depigmenting hair, said kit comprising a first agent and a second agent, said first agent comprising a reducing agent and a coupler, at least one of said first agent and said second agent comprising a chelating agent, said coupler comprising C1‑C6An alkylresorcinol or a salt thereof, the chelating agent comprising ethylenediamine-N, N' -disuccinic acid or a salt thereof. The set for dyeing hair has not only an excellent dyeing effect to brighten dyed hair but also to prevent the dyed hair from darkening again.

Description

Set for depigmenting hair
Technical Field
The present invention relates to a kit for depigmenting hair.
Background
Generally, as one of the methods for artificially coloring hair, hair is colored with an oxidative hair dye. The oxidative hair dye develops color by allowing the dye to penetrate into the hair and to bind to the hair by an oxidation reaction.
When trying to color-change or make brighter hair colored as described above, a dye-release agent is needed. The dye remover does not remove natural melanin from hair like a bleaching remover, but removes artificial dye from artificially dyed hair by a reducing action, thereby brightening the hair.
After the dye-releasing agent is treated on the dyed hair, the dye loses color due to the reduction of the dye to exhibit a seemingly good dyeing effect, but the reduced dye remaining inside the hair is naturally oxidized with the lapse of time to darken the hair again. To solve these problems, a dye remover containing a stronger reducing agent may be used, but the irritation to the scalp and the damage to the hair may be aggravated. In this regard, there is a need to develop a hair dye remover that can prevent the hair from becoming darker again by inhibiting the natural oxidation of the dye after the dye is removed.
[ Prior art documents ]
[ patent document ]
(patent document 1) korean patent laid-open publication No. 10-2012-0081240.
Disclosure of Invention
Technical problem
In one aspect, the present invention aims to provide a kit for dyeing hair, which has an excellent dyeing effect, makes dyed hair bright and also prevents the dyed hair from darkening again.
Technical scheme
In one aspect, the present invention provides a kit for depigmenting hair, said kit comprising a first agent and a second agent, said first agent comprising a reducing agent and a color-former, at least one of said first agent and said second agent comprising a chelating agent, said color-former comprising C1-C6An alkylresorcinol or a salt thereof, the chelating agent comprising ethylenediamine-N, N' -disuccinic acid (EDDS) or a salt thereof.
In one exemplary embodiment, the depigmentation may be a depigmentation of an artificial dye dyeing the hair, which may include an aromatic amine.
In one exemplary embodiment, the reducing agent may include one or more substances selected from cysteine or a salt thereof, erythorbic acid or a salt thereof, ascorbic acid or a salt thereof, thioglycolic acid or a salt thereof, a sulfite, a bisulfite, a thiosulfate, sodium formaldehyde sulfoxylate (sodium oxymethylene sulfoxylate), and a sulfoxylate (hydrosilate).
In one exemplary embodiment, the reducing agent may comprise Ethanolamine thioglycolic acid (ethanolamide thioglycolic acid).
In an exemplary embodiment, the reducing agent may be included in an amount of 3 to 15 wt% based on the total weight of the first agent.
In an exemplary embodiment, said C1-C6The alkylresorcinol may comprise methylresorcinol, and preferably, the methylresorcinol may be 2-methylresorcinol.
In one exemplary embodiment, the color former may be included in an amount of 0.06 wt% to 0.9 wt% based on the total weight of the first dose.
In an exemplary embodiment, the chelating agent may be present in an amount of 0.06 to 4.5 wt% based on the total weight of the first or second agent.
In an exemplary embodiment, in use, the first and second agents may be present in a ratio of 1: mixing the first agent and the second agent in a weight ratio of 0.5 to 2.
In one exemplary embodiment, the weight ratio of the color former to the chelating agent in the first agent may be 1: 1 to 10.
In an exemplary embodiment, at least one of the first agent and the second agent may further comprise one or more selected from the group consisting of an antioxidant, a surfactant, a thickener, and a care agent.
Advantageous effects
On the one hand, the kit for dyeing hair according to the present invention not only has excellent dyeing effect such that dyed hair becomes bright, but also can prevent the dyed hair from darkening again.
Detailed Description
Hereinafter, the present invention will be described in detail.
In one aspect, the present invention provides a kit for depigmenting hair, said kit comprising a first agent and a second agent, said first agent comprising a reducing agent and a color-forming agent, at least one of said first agent and said second agent comprising a chelating agent.
In one embodiment, the reducing agent functions to depigment the dye dyeing the hair by reduction, and may include one or more selected from cysteine or a salt thereof, erythorbic acid or a salt thereof, ascorbic acid or a salt thereof, thioglycolic acid or a salt thereof, a sulfite, a bisulfite, a thiosulfate, sodium oxymethylene sulfoxylate, and a hydrosulfite, but is not limited thereto. Preferably, the reducing agent may comprise ethanolamine thioglycolic acid.
In one embodiment, the reducing agent may be present in an amount of 3 to 15 wt%, based on the total weight of the first agent. When the content of the reducing agent is less than 3% by weight, the dye dyeing the hair cannot be sufficiently reduced, and when the content of the reducing agent is more than 15% by weight, irritation to the scalp and damage to the hair may be increased. Specifically, the content of the reducing agent may be 3 wt% or more, 3.5 wt% or more, 4 wt% or more, 4.5 wt% or more, 5 wt% or more, 5.5 wt% or more, 6 wt% or more, 6.5 wt% or more, or 7 wt% or more, and 15 wt% or less, 14.5 wt% or less, 14 wt% or less, 13.5 wt% or less, 13 wt% or less, 12.5 wt% or less, 12 wt% or less, 11.5 wt% or less, or 11 wt% or less, based on the total weight of the first agent.
In one embodiment, the coupler is used to prevent darkening of hair caused by re-oxidation of the dye present in the hair after dyeing, and such coupler may comprise C1-C6Alkylresorcinols or the likeAnd (3) salt. Said C is1-C6The alkylresorcinol may preferably comprise methylresorcinol, more preferably may comprise 2-methylresorcinol. 2-MethylResorcinol exhibits a light color compared with other couplers, and therefore, even if the dye present in the hair is oxidized again after dyeing, the darkening of the color development can be effectively prevented.
In the present specification, "salt" refers to a salt according to an aspect of the present invention that is acceptable in cosmetics and has a desired activity of a parent compound (parent compound). The salts may include (1) those formed from inorganic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, and the like; or from compounds such as acetic acid, propionic acid, hexanoic acid, cyclopentanepropionic acid, glycolic acid, pyruvic acid, lactic acid, malonic acid, succinic acid, malic acid, maleic acid, fumaric acid, tartaric acid, citric acid, benzoic acid, 3- (4-hydroxybenzoyl) benzoic acid, cinnamic acid, mandelic acid, methanesulfonic acid, ethanesulfonic acid, acid addition salts (acid addition salts) formed with organic acids such as 1, 2-ethane-disulfonic acid, 2-hydroxyethanesulfonic acid, benzenesulfonic acid, 4-chlorobenzenesulfonic acid, 2-naphthalenesulfonic acid, 4-toluenesulfonic acid, camphorsulfonic acid, 4-methylbicyclo [2,2,2] -oct-2-ene-1-carboxylic acid, glucoheptonic acid, 3-phenylpropionic acid, trimethylacetic acid, t-butylacetic acid, dodecylsulfuric acid, gluconic acid, glutamic acid, hydroxynaphthoic acid, salicylic acid, stearic acid, muconic acid, and the like; or (2) a salt in which an acidic proton present in the parent compound is substituted.
In one embodiment, the color former may be included in an amount of 0.06 wt% to 0.9 wt%, based on the total weight of the first agent. When the content of the coupler is less than 0.06 wt%, the hair after dyeing becomes dark again, and when the content of the coupler is more than 0.9 wt%, the irritation to the scalp is increased. Specifically, the content of the color former may be 0.06 wt% or more, 0.1 wt% or more, 0.15 wt% or more, 0.18 wt% or more, 0.2 wt% or more, 0.23 wt% or more, 0.25 wt% or more, 0.28 wt% or more, or 0.3 wt% or more, and 0.9 wt% or less, 0.85 wt% or less, 0.8 wt% or less, 0.75 wt% or less, 0.7 wt% or less, 0.65 wt% or less, 0.6 wt% or less, 0.55 wt% or less, 0.5 wt% or less, 0.45 wt% or less, or 0.4 wt% or less, based on the total weight of the first agent.
In one embodiment, the chelating agent functions to inhibit reoxidation of the dye reduced by the reducing agent, and such chelating agent may comprise ethylenediamine-N, N' -disuccinic acid (EDDS) or a salt thereof.
In one embodiment, the chelating agent may be present in an amount of 0.06 to 4.5 wt% based on the total weight of the first or second agent. When the content of the chelating agent is less than 0.06 wt%, it is difficult to expect the effect of inhibiting the oxidation of the dye, and when the content of the chelating agent is more than 4.5 wt%, the irritation to the scalp may be increased. Specifically, the chelating agent may be contained in an amount of 0.06 wt% or more, 0.1 wt% or more, 0.15 wt% or more, 0.2 wt% or more, 0.3 wt% or more, 0.4 wt% or more, 0.5 wt% or more, 0.6 wt% or more, 0.7 wt% or more, 0.8 wt% or more, 0.9 wt% or more, 1 wt% or more, 1.1 wt% or more, 1.2 wt% or more, or 1.3 wt%, and 4.5 wt% or less, 4.4 wt% or less, 4.3 wt% or less, 4.2 wt% or less, 4.1 wt% or less, 4 wt% or less, 3.9 wt% or less, 3.8 wt% or less, 3.7 wt% or less, 3.6 wt% or less, 3.5 wt% or less, 3.3.5 wt% or less, 3.3.3 wt% or less, or 3.3.3.3.3 wt% or less, or 3.3.3.3 wt% or less, or 3.3.3.3.3.3 wt, 3.1 wt% or less, 3 wt% or less, 2.9 wt% or less, 2.8 wt% or less, 2.7 wt% or less, 2.6 wt% or less, 2.5 wt% or less, 2.4 wt% or less, 2.3 wt% or less, 2.2 wt% or less, 2.1 wt% or less, or 2 wt% or less.
In one embodiment, the weight ratio of the first agent and the second agent used in combination may be 1: 0.5 to 2, preferably 1: 1 to 1.5, more preferably 1: 1. if the weight ratio of the first agent to the second agent is outside the range, the effect of the dye removal is reduced due to the reduction in the amount of the reducing agent when the ratio of the first agent is reduced, and the irritation to the scalp is increased when the ratio of the first agent is increased.
In one embodiment, the weight ratio of the color former to the chelating agent in the first agent may be 1: 1 to 10, preferably 1: 1 to 6, more preferably 1: 1.5 to 5. When the weight ratio of the coloring agent to the chelating agent is out of the range, the effect of preventing the hair from darkening again after the dyeing is reduced.
In one embodiment, at least one of the first agent and the second agent may suitably contain, in addition to the components, components used in a conventional dye remover, for example, an antioxidant, a surfactant, a thickener, a perfume, a care agent, and the like, within a range not to impair the effects of the present invention.
In one embodiment, the surfactant may comprise one or more selected from the group consisting of a cationic surfactant, an anionic surfactant, and a nonionic surfactant. Further, as the thickener, a higher alcohol having 14 to 22 carbon atoms may be used alone or in combination, and nonionic polymers and anionic polymers, paraffin, light liquid isoparaffin, and the like may be used. The care agent may comprise one or more materials selected from cationic polymers, quaternary ammonium salts and silicon.
In one embodiment, the first and second agents may generally contain water in addition to the ingredients. As the water, purified water such as ion-exchanged water or distilled water is preferably used, and the content thereof is not particularly limited as long as the components of the dye remover composition can be sufficiently dissolved or dispersed.
In one embodiment, the depigmentation may be a depigmentation of an artificial dye that dyes hair. The artificial dye may include an aromatic amine, for example, the aromatic amine may include one or more selected from the group consisting of o-aminophenol, p-aminophenol, m-aminophenol, p-phenylenediamine, toluene-2, 5-diamine hydrochloride, p-phenylenediamine hydrochloride, toluene-2, 5-diamine, p-phenylenediamine sulfate, p-methylaminophenol sulfate, o-aminophenol sulfate, p-aminophenol sulfate, toluene-2, 5-diamine sulfate, and p-phenylenediamine sulfate, but is not limited thereto. Preferably, the artificial dye may comprise p-phenylenediamine.
In another aspect, the present invention provides a composition for depigmenting hair, said composition comprising a reducing agent, a coupler comprising C, and a chelating agent1-C6An alkylresorcinol or a salt thereof, the chelating agent comprising ethylenediamine-N, N' -disuccinic acid (EDDS) or a salt thereof, the depigmentation being of an artificial dye for dyeing hair. Such a composition for depigmenting hair may be in dosage form 1.
In one embodiment, the composition may include 3 to 15 wt% of a reducing agent, 0.06 to 0.9 wt% of a color former, and 0.06 to 4.5 wt% of a chelating agent, based on the total weight of the composition.
In one aspect, the present invention provides a use of the kit for depigmenting hair for the depigmentation of artificial dyes in dyed hair. This can be a depigmentation of artificial dyes that dye the hair.
In one aspect, the present invention provides the use of a combination of a reducing agent, a coupler and a chelating agent in the preparation of a composition for depigmenting hair. The color former may comprise C1-C6The chelating agent may include ethylenediamine-N, N' -disuccinic acid (EDDS) or a salt thereof, and the reducing agent may be contained in an amount of 3 to 15% by weight based on the total weight of the composition, and the dyeing may be a dyeing of an artificial dye dyeing the hair.
Hereinafter, the present invention will be described in more detail by way of examples. It should be understood by those skilled in the art that these examples are only for illustrating the present invention, and the scope of the present invention is not limited by these examples.
[ preparation example: preparation of Hair decolouring Agents
The hair depilating agents of examples 1 to 6 and comparative examples 1 to 8 were prepared in the compositions shown in tables 1 and 2 below (unit: wt%).
[ TABLE 1 ]
Figure BDA0002798388310000051
Figure BDA0002798388310000061
[ TABLE 2]
Figure BDA0002798388310000062
Figure BDA0002798388310000071
The ingredients were added to purified water at 75 ℃ in the composition ratios described in tables 1 and 2, and after uniformly mixing, cooling was performed to obtain a first dose and a second dose, which were then mixed at a ratio of 1: 1 to prepare a hair dye remover.
Experimental example 1: evaluation of Decanting Capacity ]
In order to evaluate the bleaching ability of the examples and comparative examples, the first and second hairdye agents having the compositions shown in the following table 3 were mixed and applied to bleached human hair and left at 25 c for 30 minutes. Then, after washing with shampoo and drying, it was left for 1 day to obtain dyed human hair.
[ TABLE 3 ]
Figure BDA0002798388310000072
Figure BDA0002798388310000081
The hair-setting agents of examples 1 to 6 and comparative examples 1 to 8 were applied to the dyed human hair, respectively, and after being left at 25 ℃ for 30 minutes, washed with shampoo and dried. After drying, the value of the color change dE1 due to the treatment with the stripping agent was determined using a colorimeter (Hunterlab Labscan XE). dE is calculated using the following mathematical formula.
dE＝[(dL)2+(da)2+(db)2]1/2
In the mathematical formula, dL is a change in brightness of the hair, da is a change in red value of the hair, and db is a change in yellow value of the hair.
The human hair treated with the dye remover was left in a thermostat at 40 ℃ for 24 hours, and then the color change value dE2 after 24 hours after the treatment of the dye remover was measured by a colorimeter, and the results are shown in table 4.
[ TABLE 4 ]
Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative example 1
dE1 27.11 27.42 29.87 31.39 29.93 31.32 25.5
dE2 7.74 7.62 7.58 6.81 7.60 6.76 8.93
Comparative example 2 Comparative example 3 Comparative example 4 Comparative example 5 Comparative example 6 Comparative example 7 Comparative example 8
dE1 2.18 25.82 26.1 29.37 29.18 30.18 25.3
dE2 1.09 8.68 8.52 9.01 9.18 8.57 7.61
dE1 is the color change value caused by the dye remover, and the larger the dE1 value is, the brighter the hair is, the better the dye removing effect is; dE2 is a color change value after 24 hours from the treatment of the dye remover, and a smaller dE2 value indicates a superior effect of preventing hair from becoming darker again.
As shown in table 4, examples 1 to 6 including EDDS have higher dE1 values than comparative examples 1 and 8 not including EDDS and comparative examples 3 and 4 including chelating agents other than EDDS, and thus it is understood that the effect of lightening hair is excellent. Further, examples 1 to 6 including 2-methylresorcinol have a lower dE2 value than comparative examples 5 and 6 including resorcinol or m-aminophenol as a coupler and comparative example 7 not including a coupler, and thus it is known that the effect of preventing hair from becoming dark again is excellent.
It was confirmed that comparative example 2 did not have a hair-lightening effect because the content of the reducing agent (ethanolamine thioglycolic acid) was too low.
From these results, it is understood that the examples have an excellent effect of lightening hair and, at the same time, have a remarkable effect of preventing hair from becoming darker again after the hair removal.

Claims (11)

1. A kit for depigmenting hair, comprising a first agent and a second agent, wherein,
the first agent comprisesA reducing agent and a color former, at least one of the first agent and the second agent comprising a chelating agent, the color former comprising C1-C6An alkylresorcinol or a salt thereof, the chelating agent comprising ethylenediamine-N, N' -disuccinic acid or a salt thereof.
2. Kit for depigmenting hair according to claim 1, characterized in that said depigmentation is a depigmentation of artificial dyes dyeing the hair.
3. Kit according to claim 1, characterized in that the reducing agent comprises one or more substances selected from cysteine or salts thereof, erythorbic acid or salts thereof, ascorbic acid or salts thereof, thioglycolic acid or salts thereof, sulfites, bisulfites, thiosulfates, sodium formaldehyde sulfoxylates and sulfoxylates.
4. Kit for bleaching hair according to claim 1, characterized in that the reducing agent is present in an amount of 3 to 15% by weight based on the total weight of the first agent.
5. Kit for depigmenting hair according to claim 1, wherein C is1-C6The alkylresorcinol comprises methylresorcinol.
6. Kit for bleaching hair according to claim 1, characterized in that the coupler is present in a quantity comprised between 0.06 and 0.9% by weight relative to the total weight of the first agent.
7. Kit for bleaching hair according to claim 1, characterized in that the content of said chelating agent is comprised between 0.06 and 4.5% by weight of the total weight of the first or second agent.
8. Kit for depigmenting hair according to claim 1, wherein, in use, said first and second doses are in the range of 1: mixing is carried out in a weight ratio of 0.5 to 2.
9. Kit according to any one of claims 1 to 8, characterized in that the weight ratio of coupler and chelant of the first agent is 1: 1 to 10.
10. A composition for depigmenting hair, wherein,
the composition comprises a reducing agent, a color former, and a chelating agent,
the color former comprises C1-C6An alkylresorcinol or a salt thereof, the chelating agent comprising ethylenediamine-N, N' -disuccinic acid or a salt thereof, the reducing agent being present in an amount of 3 to 15 wt% based on the total weight of the composition, the depigmenting being of an artificial dye for dyeing hair.
11. Use of a combination of a reducing agent, a coupler and a chelating agent in the preparation of a composition for depigmenting hair, wherein,
the color former comprises C1-C6An alkylresorcinol or a salt thereof, the chelating agent comprising ethylenediamine-N, N' -disuccinic acid or a salt thereof, the reducing agent being present in an amount of 3 to 15 wt% based on the total weight of the composition, the depigmenting being of an artificial dye for dyeing hair.
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