JP2007302677A - Hair dye - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hair dye which is held in an applicator provided with at least a reservoir to store the hair dye and a core composed of a pad having capillary force, does not require shampooing immediately after application and is a hair manicure-type hair dye having progressive dyeing ability and dyes the hair gradually by using it repeatedly as a temporary colorant. <P>SOLUTION: The hair dye is held in an applicator provided with at least a reservoir to store the hair dye and a core composed of a pad having capillary force, contains 0.1-3 wt.% of at least one kind of water-soluble dye (except for Black No. 401), 0.03-2.4 wt.% of an amphoteric acrylic resin, 2-20 wt.% of a dyeing auxiliary and 20-80 wt.% of a lower alcohol and has viscosity adjusted at 2.6-15 mPa s and a pH adjusted at 2-5. The hair dye has excellent progressive dyeing ability, usability and water resistance against sweat during a high temperature and humidity season such as the summer, rain or the like. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hair dye of a cumulative hair-dyeing type, in which hair is dyed gradually by repeated use as a temporary colorant without having to wash the hair immediately after use.

Conventionally, permanent hair dyes (oxidative hair dyes) and semi-permanent hair dyes (acid dyes), which are generally used in general, are complicated and troublesome in use, and the surroundings, clothes, and skin of the subject. Has a major drawback such as being dyed.
For this reason, in general, the user has to be treated at a hairdressing salon, or he / she has to perform self-treatment when taking a bath so that it can be washed away immediately even if it gets dirty.

  As a hair manicure that reduces these burdens and can be used for cumulative hair dyeing by repeated repeated use even if the amount dyed at one time is small, for example, an acid dye is used as a colorant by the present applicant. 1% by weight, 1.5 to 10% by weight of nonionic or anionic silicone resin, 3 to 20% by weight of hair dyeing assistant, 30 to 80% by weight of lower alcohol, and 5 to 50% by weight of water. A cumulative hair-dyeing temporary hair dye characterized by having a pH of 2 to 5 and a viscosity of 100 mPa · s or less is known (see Patent Document 1), and a specific amphoteric polymer resin and an acid It contains a dye and a pigment, and the blending amount of the amphoteric polymer resin is 0.01 or more and less than 1% by weight with respect to the total amount of the hair cosmetic, and the blending amount of the acidic dye with respect to 1 part by weight of the amphoteric polymer resin is 0.01. Parts by weight or more and less than 0.1 parts by weight, A color hair cosmetic (see Patent Document 2) characterized in that the amount of the pigment added is 0.0005 parts by weight or more and less than 1 part by weight based on 1 part by weight of the total of the functional polymer resin and the acid dye. .

However, although the hair dye of the above-mentioned patent document 1 is excellent as a hair that can be cumulatively dyed, it has insufficient water resistance, and in the summer when the prescription is increased with an emphasis on temporary colorability. There are problems such as secondary adhesion to the skin with sweat during the hot and humid period and soiling the skin, and rain and the like to stain the clothes. Because of this problem, the actual situation is that the use is limited to the hairline.
In addition, the color hair cosmetic of Patent Document 2 improves coloring power, secondary adhesion, cleanability and feeling of use, and completely removes the color tone imparted to the hair by shampoo washing. In order to obtain a soft and natural finish, the pigment is essential, the blending amount of the acidic dye is less than 0.1 parts by weight, and the blending amount of the amphoteric polymer resin is also less than 1% by weight. It is an amount, and the object, technical idea, and the like are completely different from those of the present invention in which hair is cumulatively dyed.

On the other hand, blending dark color, especially black No. 401, was an essential component in the formulation of the temporary colorant for gray hair. However, according to the knowledge of the present inventors, when a certain amount or more of amphoteric acrylic resin and black No. 401 dye are used in a hydroalcoholic vehicle, it is difficult to formulate due to coagulation sedimentation. There is a problem.
JP 2001-172141 A (Claims etc.) JP-A-10-273431 (Claims etc.)

  The present invention has been made in view of the above-mentioned problems of the prior art, and is intended to solve this problem. It is excellent in cumulative hair dyeability and usability, and excellent in sweat, rain, and the like due to a hot and humid period such as summer. Another object of the present invention is to provide a hair removal agent having water resistance.

（５） 染毛助剤がベンジルアルコール、フェニルエチルアルコール、炭酸プロピレン、フェノキシエタノール、プロピレングリコール、Ｎ−メチルピロリドン、グルコン酸ラクトン、レブリン酸、尿素、エチレンカーボネート、Ｎ−メチル−２−ピロリドン、α−ケトグルタール酸、γ−ブチルラクトン、プロピオンアミド、酢酸アミドの中から選ばれる少なくとも１種である上記（１）〜（４）の何れか一つに記載の染毛料。 As a result of intensive studies on the above-mentioned problems of the prior art, the present inventors set the contents of water-soluble dyes, amphoteric acrylic resins, hair dyeing assistants and lower alcohols to specific ranges and specify the pH. It was found that the above-mentioned hair dyes and the like can be obtained by setting the above range, and the present invention has been completed.
That is, the present invention resides in the following (1) to (5).
(1) A hair dye that is provided in an applicator that includes at least a storage part that stores a hair dye, and the application body is a core body having a capillary force, and is at least one of water-soluble dyes (excluding black 401). Contains 0.1 to 3% by weight of seed, 0.03 to 2.4% by weight of amphoteric acrylic resin, 2 to 20% by weight of hair dyeing assistant, and 20 to 80% by weight of lower alcohol, and has a viscosity of 2 A hair dye characterized by being adjusted to 6 to 15 mPa · s and pH 2 to 5.
(2) At least one kind of water-soluble dye (excluding black 401), which is provided with a storage unit that contains at least a hair dye, and is applied to an applicator whose application body is a brush body. Containing 3 to 3% by weight, amphoteric acrylic resin 0.03 to 2.4% by weight, hair dyeing assistant 2 to 20% by weight, lower alcohol 20 to 80% by weight, and a viscosity of 2.6 to 15 mPa -Hair dye characterized by adjusting s and pH to 2-5.
(3) The hair dye according to (1) or (2), wherein the water-soluble dye is an acid dye or a direct dye.
(4) The above (1) to (1), wherein the amphoteric acrylic resin is an N-methacryloyloxyethyl N, N-dimethylammonium-α-N-methylcarboxybetaine / methacrylic acid alkyl ester copolymer represented by the following formula (I): The hair dye as described in any one of (3).

(5) Hair dyeing assistant is benzyl alcohol, phenylethyl alcohol, propylene carbonate, phenoxyethanol, propylene glycol, N-methylpyrrolidone, gluconic acid lactone, levulinic acid, urea, ethylene carbonate, N-methyl-2-pyrrolidone, α- The hair dye according to any one of (1) to (4) above, which is at least one selected from ketoglutaric acid, γ-butyllactone, propionamide, and acetic acid amide.

  ADVANTAGE OF THE INVENTION According to this invention, while being excellent in cumulative hair dyeing property and usability, the hair dye which has the outstanding water resistance with respect to sweat, rain, etc. by the hot and humid period of summer etc. is provided.

Embodiments of the present invention will be described below.
The hair dye of the present invention is a hair dye accommodated in a specific applicator, and is 0.1 to 3% by weight of at least one water-soluble dye (excluding black 401) and 0.03 to 2 of an amphoteric acrylic resin. 4 wt%, hair dyeing assistant 2 to 20 wt%, lower alcohol 20 to 80 wt%, viscosity adjusted to 2.6 to 15 mPa · s and pH adjusted to 2 to 5 It is characterized by.

The water-soluble dye used in the present invention is not particularly limited as long as it is a water-soluble dye usually used for temporary hair dyes and semi-permanent hair dyes. Preferably, it is desirable to use an acid dye or a direct dye from the viewpoint of excellent hair dyeability.
Specifically, “Ministerial ordinance for determining tar pigments that can be used for pharmaceuticals” that is permitted to be used for coloring pharmaceuticals, quasi-drugs, and cosmetics that do not have harmful effects on the human body. It can be used as one kind or a mixture of two or more kinds selected from those determined by (1960 announcement, Ministry of Health and Welfare).

Specific examples of acid dyes include red No. 3 (erythrosin), red 102 (new coxin), orange (orange II), yellow No. 4 (tartrazine), yellow No. 402 (Pola Yellow 5G), yellow No. 403 (1) ) (Naphthol Yellow S), Green No. 3 (First Green FCF), Green No. 204 (Pyranin Conch), Blue No. 1 (Brilliant Blue FCF), Blue No. 202 (Patent Blue NA), Purple No. 401 (Alizol Purple), Examples include brown 201 (Resorcin Brown), but are not limited thereto.
Specific examples of the direct dye include Direct Black 51, Direct Red 23, Direct Red 80, Direct Violet 48, Direct Yellow 12, and Direct Red 81, but are not limited thereto.
The content of these water-soluble dyes should be 0.1 to 3% by weight (hereinafter simply referred to as “%”) with respect to the total amount of the hair dye, and preferably 0.1 to 1%. Is desirable.
If the content of the water-soluble dye is less than 0.1%, the hair dyeing effect is not sufficiently exhibited, and if it exceeds 3%, contamination of the skin and the like tends to occur, which is not preferable.

The amphoteric acrylic resin used in the present invention improves the sweat resistance and water resistance during use of all heads without impairing the temporary colorability and cumulative hair dyeing properties, and is likely to occur in a hot and humid period such as summer. In order to further prevent contamination due to secondary adhesion to clothing, it is included.
As the amphoteric acrylic resin used in the present invention, an N-methacryloyloxyethyl N, N-dimethylammonium-α-N-methylcarboxybetaine / methacrylic acid alkyl ester copolymer represented by the following formula (I) may be used. Further, from the viewpoints of usability and handleability, it is desirable to use a solution of the above copolymer water, ethanol, denatured alcohol or a mixture thereof.

The copolymer represented by the above formula (I) is composed of N-methacryloyloxyethyl N, N-dimethylammonium-α-N-methylcarboxybetaine and alkyl methacrylate (C1-C4, C6, C8, C12, C13). , C18 etc.).
Specific examples of amphoteric acrylic resins that can be used include commercially available Yucaformer SM (solid content 30%, average molecular weight 130,000, ethanol 70% solution), Yucaformer 202 (solid content 30%, average molecular weight 80,000, ethanol 70%). Liquid), Yuka Former 301 (solid content 30%, average molecular weight 100,000 or less, ethanol 70% liquid) (above, manufactured by Mitsubishi Chemical Corporation), and the like.

The content of the amphoteric acrylic resin in the present invention is required to be 0.03 to 2.4% based on the total amount of the hair dye in terms of solid content, preferably 0.1 to 0.9. %, More preferably 0.1 to 0.45%.
If the content of the amphoteric acrylic resin is less than 0.03%, the water resistance is weak, and if it exceeds 2.4%, the viscosity increases and aggregation at low temperatures tends to occur, which is not preferable. .

Examples of the hair dyeing assistant used in the present invention include benzyl alcohol, phenylethyl alcohol, phenoxyethanol, propylene glycol, N-methylpyrrolidone, gluconic acid lactone, levulinic acid, urea, ethylene carbonate, N-methyl-2-pyrrolidone, α-ketoglutaric acid, γ-butyrolactone, propionamide, n-acetamide, etc., which are used in general acidic hair dyes (semi-permanent hair dyes) are used alone or in combination of two or more. Of these, benzyl alcohol and phenylethyl alcohol are preferred in view of the hair dyeing effect and the stability of the prescription system.
The content of these hair dyeing assistants is required to be 2 to 20%, preferably 5 to 15%, based on the total amount of the hair dye.
If the content of the hair dyeing assistant is less than 2%, the hair dyeing effect is not sufficiently exhibited, and if it exceeds 20%, the drying property is lowered, which is not preferable.

As the lower alcohol used in the present invention, for example, one or more of ethyl alcohol (ethanol), propanol, butanol, isopropanol, isobutanol and the like are used, but ethyl alcohol is used from the viewpoint of safety, drying property, smell and the like. desirable.
The content of the lower alcohol is required to be 20 to 80%, preferably 40 to 70%, based on the total amount of the hair dye.
If the content of the lower alcohol is less than 20%, the drying property is lowered, and if it exceeds 80%, the hair dyeing effect is not sufficiently exhibited, which is not preferable.

The remainder of the hair dye in the present invention is adjusted with water, for example, purified water, ion-exchanged water, pure water, distilled water, deep sea water, etc. can be used, and the content thereof is based on the total amount of the hair dye, It is desirable to set it as 5 to 50%, More preferably, it is desirable to set it as 10 to 35%.
If the water content is less than 5%, the hair cannot be sufficiently swollen and the hair dyeing effect is lowered. If it exceeds 50%, the drying property is lowered, which is not preferable.
In addition, the hair dye of this invention can contain suitably other arbitrary components in the range which does not impair the effect of this invention and the stability of a system. Examples include various surfactants, preservatives, antioxidants, anti-reduction agents, chelating agents, ultraviolet absorbers, viscosity modifiers, oily components, silicone derivatives, fragrances, animal and plant extracts, and known polymer components.

The pH of the hair dye of the present invention needs to be adjusted to 2 to 5, preferably 2 to 4.
If the pH of the hair dye is less than 2, there may be irritation to the skin, and if the pH exceeds 5, the hair dyeing effect is lowered, which is not preferable.
In the present invention, the pH can be adjusted using formic acid, acetic acid, lactic acid, tartaric acid, malic acid, citric acid, glycolic acid and other organic acids, inorganic acids or salts thereof, and optionally alkalis.

The viscosity of the hair dye of the present invention is 2.6 mPa · s or more and 15 mPa · s or less, preferably 2.6 mPa · s or more and 10 mPa · s or less, more preferably from the viewpoint of easy application to hair. 3 to 8 mPa · s is desirable.
When the viscosity of this hair dye exceeds 15 mPa · s, it is difficult to apply it thinly and uniformly to the hair, which is not preferable.

The hair dye in the present invention can be produced by blending each component such as the above water-soluble dye, amphoteric acrylic resin, hair dyeing assistant, lower alcohol and the like within the above ranges and stirring and mixing uniformly. it can.
The hair dye of the present invention configured as described above is excellent in temporary colorability and cumulative hair dyeability, and has excellent water resistance against sweat, rain, and the like due to a hot and humid period such as summer. It will be.

  The hair dye of the present invention can be suitably used as a temporary colorant for black hair, a temporary colorant for gray hair, and the like.

In using the hair dye of the present invention thus configured, a hair applicator is used, but the shape, structure, etc. of the hair applicator to be used are not particularly limited.
In the present invention, as a hair applicator that can be used, preferably, the applicability to hair, the controllability of the amount of liquid contained in the application site, the occurrence of less fouling of clothes, skin, furniture, etc. From the viewpoint of usability, an applicator main body having the hair dye reservoir of the present invention inside, and an applicator provided at the tip of the applicator main body, the applicator from the hair dye reservoir And a hair applicator for applying the hair dye to the hair by allowing the hair dye of the present invention to flow out.

Examples of the hair applicator configured as described above include, for example, a hair applicator A shown in FIGS. 1 to 3, a hair applicator B shown in FIG. 4, and a hair applicator C shown in FIG. Is mentioned. Below, these applicators AC for hair are demonstrated concretely.
The hair applicator A is a so-called batting type (occlusion body) applicator, and, as shown in FIGS. 1 to 3, occludes the hair dye having the above-described configuration in the shaft body 10 constituting the applicator main body. The occlusion body 11 is accommodated in the hair dye storage part 10a, and a core body 12 which is a comb-like coating for application having a plurality of capillary actions is fixed to the tip of the shaft body 10 in a linear row arrangement, 12 is connected to the occlusion body 11, and the tip end of the core body 12 is projected forward of the shaft body 10. A comb portion 13 is provided on the side of the core body 12, The cap body 20 is made detachable by screwing, and a core tip receiving member 21 such as a felt that contacts the tip of the core body 12 is attached, and a concave portion 22 that accommodates the tip of the comb portion 13 is provided on the side thereof. The provided inner cap 23 is movable in the axial direction inside the cap body 20 and is circular. By disposing freely rotatable in the directions, in which the middle cap 23 was energized by the spring member 24 toward the opening of the cap body 20.
In the hair applicator A having such a configuration, the necessary hair dye is provided from the occlusion body 11 in which the hair dye having the above-described configuration of the present invention is occluded to the storage portion 10a to the tip of the core body 12 serving as the application portion. While being supplied, it does not cause dripping or unintentional liquid discharge, and is excellent in carrying and handling properties, and can be used as a hair applicator excellent in usability, water resistance and cumulative hair dyeing properties. .

  When using the hair dye of the present invention using this hair applicator A, since it has the core 12 as the tip application body, it is possible to avoid contamination to the scalp as much as possible, The hair dye can be easily applied to the hair near the scalp (the hairline), making the best use of the properties of the hair dye of the present invention and temporarily holding the hair dye in the occlusion body, making it ideal for hair through the application part An amount of hair dye can be applied.

The hair applicator B is an applicator provided with a knock type valve device, and the base 31 is fixed to the distal end portion of the applicator main body 30 as shown in FIGS. 4 (a) to 4 (c). The pedestal 31 is provided with a coating portion 32 composed of brush bodies 32a, 32a. Further, a front shaft 33 is fixed to the outer periphery of the pedestal 31, and a comb body 35 having comb teeth portions 35a, 35a... Is detachably attached to the front shaft 33. An impregnated body 36 made of a sponge or the like that contacts the application portion 32 is fitted into the center hole of the base 31, and a hair dye guide tube 38 that communicates with the distal end of the valve device to be described later with an impregnated body stopper 37 sandwiched behind the base 31. Is provided.
The applicator main body 30 has a cylindrical inner shaft 40 serving as a hair dye storage portion, and a valve rod 41, a valve seat 42, a valve spring 43, and a spring receiver 44 at the tip thereof. The device 45 is attached and a knock body 46 is provided at the rear end.
In the hair applicator B having such a configuration, the hair dye is filled via the hair dye guide tube 38 by filling the storage section 40 with the hair dye having the above structure of the present invention and knocking the knock body 46. It flows out to the impregnating body 36 and is supplied to the application section 32 composed of the brush bodies 32a, 32a... For use.
The hair applicator B has a structure in which the hair dye is supplied from the impregnated body 36 to the application section 32 composed of the brush bodies 32a, 32a..., Thus causing “dripping” and unintentional liquid discharge. In addition, since it has the comb body 35, the hair coloring agent does not directly adhere to fingers, etc., and it is excellent in carrying and handling properties, and is excellent in usability, water resistance, and cumulative hair dyeing properties. can do.

Furthermore, the hair applicator C is a mascara type applicator, and as shown in FIG. 5, the applicator main body 50 having a bottomed cylindrical body and the upper end opening of the applicator main body 50 are screwed together. And a lid 55 for sealing.
The applicator main body 50 has a hair dye storage part 51 inside thereof, and a wiping part 52 is attached to the upper part of the storage part 51. An applicator bar 56 is fixed to the lid 55, and an applicator 57 having brush bodies 57a, 57a... Is provided at the tip of the applicator bar 56.
In the hair applicator C having such a configuration, when the lid 55 is unscrewed and the lid 55 is taken out from the applicator main body 50, the hair dye is applied to the tip of the lid 55. Since the part 57 appears, hair can be dyed by applying the application part 57 to the hair part to be dyed. This hair applicator C can be suitably applied to hairline parts, eyebrows, etc., and is excellent in portability and handling properties, and also has excellent usability, water resistance, and cumulative hair dyeing properties. Can do.

  EXAMPLES Next, although an Example and a comparative example demonstrate this invention further in full detail, this invention is not restrict | limited by the following Example.

[Examples 1 to 5 and Comparative Examples 1 to 3]
Each hair dye was obtained by uniformly stirring and mixing with a general-purpose propeller mixer with the composition shown in Table 1 below.
About each hair dye of Examples 1-5 and Comparative Examples 1-3 obtained above, it measured about pH, a viscosity, and low temperature temporal stability by the following method.
These results are shown in Table 1 below.

(Measurement method of pH)
The pH (25 ° C.) was measured by a conventional method using a glass electrode pH meter.
(Viscosity evaluation method)
Each viscosity at 25 ° C. was measured with an ELD viscometer (manufactured by Toki Sangyo Co., Ltd.).
(Evaluation method of low temperature stability over time)
The sample was allowed to stand at −20 ° C. for 1 week in a 100 ml sample bottle, and then visually evaluated according to the following evaluation criteria.
Evaluation criteria:
A: No change, all in a uniform state.
○: Some color separation is recognized on the bottle wall.
Δ: A thin precipitate is observed at the bottom of the bottle.
X: A clear aggregate is recognized.

Next, 10 ml of each hair dye obtained above is filled in a hair applicator having the following constitution shown in FIGS. 1 to 3, and water resistance, temporary colorability, cumulative hair dyeability, after application are as follows. The drying property was evaluated.
These results are shown in Table 1 below.

(Configuration of hair applicator)
Core: Made of PET, vertical and horizontal distance between core and core: 3.4 mm, porosity: 80%
Comb: Made of PBT

(Water resistance evaluation method)
Apply about 0.1 ml to 2 g of hair, dry at room temperature for 120 minutes (hereinafter simply referred to as “applied to hair and dried”), and then press the filter paper moistened with water to add color to the filter paper. The condition was evaluated according to the following evaluation criteria.
Evaluation criteria:
A: No adhesion to the filter paper. O: Thin adhesion to the filter paper. Δ: A little adhesion to the filter paper.
X: It adheres darkly to the filter paper.

(Evaluation method of temporary colorability)
Performance evaluation as a primary hair dye after application and drying on hair was evaluated according to the following evaluation criteria.
Evaluation criteria:
A: Equivalent to a commercially available temporary colorant.
○: No practical problem.
Δ: Slightly difficult to dye
X: Not dyed.

(Evaluation method for cumulative hair dyeing)
After applying and drying the hair, the cumulative hair dyeability after repeated washing was evaluated three times according to the following evaluation criteria.
Evaluation criteria:
A: Equivalent to commercially available oxidative hair dye.
○: No practical problem.
Δ: Slightly difficult to dye
X: Not dyed.

(Evaluation method of dryness after application)
Under 25 ° C.-65 RH%, 0.2 g was applied to 1 g of human hair bundle, touched with a finger every 30 seconds, and the time when adhesion to the finger disappeared was measured and evaluated according to the following evaluation criteria.
Evaluation criteria:
◎: Within 1 minute ○: Within 3 minutes △: Within 5 minutes ×: Over 5 minutes

As is apparent from the results of Table 1 above, Examples 1 to 5 which are within the scope of the present invention are more stable at low temperatures, water resistance and temporary colorability than Comparative Examples 1 to 3 which are outside the scope of the present invention. It has been found that it is excellent in all aspects of cumulative hair dyeability, usability, and drying after application.
When the comparative examples are individually viewed, Comparative Example 1 is a case where no amphoteric acrylic resin is contained, and in this case, it has been found that the water resistance is remarkably inferior. Comparative Example 2 is a case where the content of the amphoteric acrylic resin exceeds 2.4% by weight. In this case, it was found that the cumulative hair dyeability and the drying property after application were inferior. Comparative Example 3 is a case where the content of the lower alcohol is small. In this case, it was found that the low temperature stability over time, the water resistance, and the drying property after coating were inferior.

It is a side view which shows an example of embodiment of this invention. It is a longitudinal cross-sectional view of the side aspect of FIG. It is a longitudinal cross-sectional view of the front aspect of FIG. (A) is a longitudinal cross-sectional view which shows the other example of embodiment of this invention, (b) is II sectional view taken on the line, (C) is a top view of a comb. It is a longitudinal cross-sectional view which shows the other example of embodiment of this invention.

Explanation of symbols

A hair applicator 10 applicator body

Claims (5)

  At least one kind of water-soluble dye (except black 401), which is stored in an applicator having at least a storage section for storing hair dye, and the application body is a core body having capillary force. 1 to 3% by weight, amphoteric acrylic resin 0.03 to 2.4% by weight, hair dyeing assistant 2 to 20% by weight, lower alcohol 20 to 80% by weight and a viscosity of 2.6 to A hair dye characterized by being adjusted to 15 to 5 mPa · s and pH 2 to 5.   It is a hair dye that is provided with a storage unit that contains at least a hair dye, and is applied to an applicator whose application body is a brush body, and is at least one type of water-soluble dye (except black 401) 0.1 to 3 weight %, Amphoteric acrylic resin 0.03 to 2.4% by weight, hair dyeing assistant 2 to 20% by weight, lower alcohol 20 to 80% by weight, and the viscosity to 2.6 to 15 mPa · s And the hair dye characterized by adjusting pH to 2-5.   The hair dye according to claim 1 or 2, wherein the water-soluble dye is an acid dye or a direct dye. The amphoteric acrylic resin is an N-methacryloyloxyethyl N, N-dimethylammonium-α-N-methylcarboxybetaine / methacrylic acid alkyl ester copolymer represented by the following formula (I): The hair dye described in one.

  Hair dyeing assistant is benzyl alcohol, phenylethyl alcohol, propylene carbonate, phenoxyethanol, propylene glycol, N-methylpyrrolidone, gluconic acid lactone, levulinic acid, urea, ethylene carbonate, N-methyl-2-pyrrolidone, α-ketoglutaric acid, The hair dye according to any one of claims 1 to 4, which is at least one selected from γ-butyllactone, propionamide, and acetic acid amide.

Images