JP2011046614A - Alternate two-step type hair dye comprising basic dye and acidic dye and dyeing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an alternate two-step type hair dye which is good in hair-dyeing power for keratin fibers such as human hair, little changes color, and is excellent in shampoo resistance and treatment resistance, and to provide an alternate two-step type hair-dyeing method using the same. <P>SOLUTION: There are provided the alternate two-step type hair dye comprising the first hair-dyeing agent containing a basic dye and adjusted to pH 5 to 8, and the second hair-dyeing agent containing an acidic dye and adjusted to pH 2 to 4, wherein one of the first agent and the second agent is used for top dyeing and the other is used for post dyeing, and a dyeing method therefor. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

INDUSTRIAL APPLICABILITY The present invention provides an alternating two-stage hair dye having excellent hair dyeing power, little color change, and excellent shampoo / treatment properties, and an alternating two-stage hair dye using the same for keratin fibers such as human hair. Provide a hair dyeing method.

Conventionally, semi-permanent hair dyes using basic dyes or acid dyes are less damaging to hair compared to oxidative hair dyes using oxidative dyes, and are excellent in safety and convenience. These basic and acidic hair dyes contain a basic dye or acid dye, an organic solvent such as an aromatic alcohol, an acid or alkali as a pH adjusting agent, and a thickening agent that prevents dripping during use. Most are one-step hair dyeing methods in which basic dyes or acid dyes are used as dyes. However, in the first step, hair is directly dyed and in the second step, dye precursors such as hydrogen peroxide are used. A hair dyeing method using an oxidative dye using an oxidant, so-called permanent hair dye, is described (see Patent Document 1). However, in this method using an oxidation dye, the use of an oxidizing agent cannot be avoided, and the irritation to the skin cannot be reduced.

Special table 2003-508418 gazette

In the conventional one-step hair dyeing method using a basic dye or an acid dye alone, even if it is used at twice the dye concentration of each of the two-step hair dyes of the present invention, it is repeatedly washed with shampoo and treatment. The dye that has been dyed is gradually desorbed, resulting in a problem of large density reduction and hue change.

The present invention has been made in view of the above problems, and has an alternate two-stage system that has good hair dyeing power and superior shampoo treatment resistance compared to the case where a basic dye or an acid dye is used alone. An object of the present invention is to provide a hair dye and an alternate two-stage hair dyeing method using the same.

That is, the present invention comprises a first agent for hair dyeing containing a basic dye and adjusted to pH 5 to 8, and a second agent for hair dyeing containing an acid dye and adjusted to pH 2 to 4. A hair dye, which is an alternating two-stage hair dye, characterized in that either the first agent or the second agent is used for pre-dying, and the other one is used for post-dying.
Further, a hair dye comprising a basic dye and a first agent for hair dyeing adjusted to pH 5 to 8 and an acid dye and a second agent for hair dyeing adjusted to pH 2 to 4 Use the first step of dyeing hair with either the first agent or the second agent and washing with water, and dyeing the other one with hair and washing with water. It is an alternate two-stage hair dyeing method characterized by having two stages.

The reason why the alternate two-stage hair dye of the present invention has good hair dyeing power and excellent shampoo treatment resistance is as follows. (1) First use the first agent in the first stage, When the second agent is used, the basic dye in the first agent is dyed by ionic bonding with the carboxyanion group of the keratin fiber at pH 5 to 8, and the second agent is layered to dye the hair as the second step. The acidic dye in the second agent is dyed by ionic bonding with the amino cation of the keratin fiber at an optimum pH value of pH 2-4. (2) When the second agent is used in the first step and the first agent is used in the second step, the acidic dye in the second agent has an optimum pH value of pH 2 to 4, and the amino cation and ion of the keratin fiber Then, the basic dye in the first agent is ion-bonded to the carboxy anion group of the keratin fiber at pH 5 to 8 and dyed. In both methods, it is considered that at the same time, a part of the binding occurs between the basic dye or the acid dye that is dyed in the first stage, thereby improving the shampoo treatment resistance.
When both the basic dye and the acid dye are contained in the bath and dyeing is performed in only one stage, there is a defect that the binding force between the two dyes is strong and a complex is formed, and the keratin fiber is not dyed strongly.

According to the present invention, there are provided an alternating two-stage hair dye and a hair dyeing method thereof that have good hair dyeing power, little color change, and excellent shampoo and treatment resistance to keratin fibers such as human hair. There is an effect that it is provided.

Hereinafter, the present invention will be described in detail.

The hair dye of the present invention comprises a first agent and a second agent, the first agent contains a basic dye, adjusted to pH 5-8, the second agent contains an acid dye, and has a pH of 2 It is adjusted to 4. An organic solvent is contained in at least one of the first agent and the second agent. In a more preferred embodiment, at least one of the first agent and the second agent contains a polymer thickener. In a further preferred embodiment, an activator is contained.

A 1st agent is adjusted to pH 5-8 by mix | blending an organic acid, an inorganic acid, and / or its salt, and an alkaline agent. When the pH is lower than 5, the dyeing effect and fastness are lowered. Above pH 8, the contamination on the skin increases. More preferably, the pH is 6-7. Examples of pH adjusters include citric acid, trisodium citrate, hydrochloric acid, phosphoric acid, disodium phosphate, monopotassium phosphate, sodium carbonate, sodium bicarbonate, sodium hydroxide, aqueous ammonia, monoethanolamine, triethanolamine, Adjust and use histidine, arginine, etc. The compounding quantity is 0.1-10 mass%.

The second agent is adjusted to pH 2-4. When the pH is lower than 2, there is irritation to the skin, and when the pH is higher than 4, the dyeing effect and fastness are lowered. More preferably, the pH is 2.5 to 3.5. As a pH adjuster for adjusting the pH to the above range, an organic acid, an inorganic acid, an alkaline agent, or the like is used. Organic acids, inorganic acids and salts thereof, and alkali agents are the same as the first agent. These organic acid, inorganic acid, alkaline agent and other pH adjusters can be used alone or in combination of two or more. The compounding quantity is 0.1-10 mass%.

The blending amount of the basic dye contained as an essential component in the first agent of the alternating two-stage hair dye of the present invention is preferably 0.01 to 5% by mass in the first agent, more preferably. 0.05 to 2% by mass.

The basic dye is not particularly limited as long as it is a basic dye that can be usually used in hair dyes. For example, Basic Blue 75, Basic Red 51, Basic Red 76, Basic Blue 99, Basic Brown 16, Basic Brown 17, Basic Yellow 57, Basic Yellow 87, Basic Orange 31 and the like. These basic dyes can be used alone or in combination of two or more.

The blending amount of the acidic dye contained as an essential component in the second agent of the alternating two-stage hair dye of the present invention is preferably 0.01 to 5% by weight in the second agent, more preferably 0. 0.05 to 2% by mass.

The acid dye is not particularly limited as long as it is an acid dye that can be usually used in hair dyes. For example, Red No. 2, Red No. 3, Red No. 102, Red No. 104, Red No. 105, Red No. 106, Yellow No. 4, Yellow No. 5, Green No. 3, Blue No. 1, Blue No. 2, Red No. 201, Red No. 227, Red No. 220, Red No. 230, Red No. 231, Red No. 232, Orange No. 205, Orange 207, Yellow 202, Yellow 203, Green 201, Green 204, Green 206, Blue 202, Blue 203, Blue 205, Red 401, Red 502, Red 503, Red 504 Red 506, orange 402, yellow 402, yellow 403, yellow 406, yellow 407, brown 201, green 401, green 402, purple 401, black 401, etc. It is. These acidic dyes can be used alone or in combination of two or more.

Examples of the organic solvent contained in the first agent and the second agent of the present invention include aliphatic alcohols that are sparingly soluble in water such as n-butyl alcohol, sec-butyl alcohol, cyclohexane, and butyl cellosolve; benzyl alcohol, 2- Aromatic alcohols such as phenoxyethanol, phenylethanol, benzyloxyethanol; cyclic ketones and ethers such as tetrahydrofurfuryl alcohol, N-methylpyrrolidone, ethylene carbonate; glycerin, propylene glycol, 1,3-butylene glycol, dipropylene glycol , Isoprene glycol, sorbitol, xylitol, ethylene glycol, diethylene glycol, diglycerin, polyethylene glycol, polyglycerin, ethylene glycol monoethyl ether, diethylene glycol Monoethyl ether, polyhydric alcohols such as ethylene glycol dimethyl ether; ethanol, butanol, propanol, lower alcohol such as isopropanol, and the like. These organic solvents can be used alone or in combination of two or more. Among these, aromatic alcohols such as benzyl alcohol, 2-phenoxyethanol, and benzyloxyethanol are preferably used from the viewpoint of hair dyeing power. Furthermore, it is more preferable from the point of hair dyeing power to use the aromatic alcohol and any one or more selected from lower alcohols and polyhydric alcohols as the organic solvent.

These organic solvents are preferably contained in at least one of the first agent and the second agent, but most preferably, by adding an organic solvent to both the first agent and the second agent, It can be dyed uniformly and at a high concentration and has excellent shampoo and treatment resistance. The blending amount of the organic solvent is preferably 2 to 40% by mass for both the first agent and the second agent from the viewpoint of hair dyeing power, and more preferably 5 to 20% by mass.

Examples of the thickener contained in the first agent and the second agent of the present invention include cellulosic polymer compounds such as methyl cellulose, hydroxypropyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, guar gum, xanthan gum, tragacanth gum, gum arabic, and gucci gum. , Gum polymer such as Karaya gum, starch polymer such as dextrin, natural polymer such as sodium alginate, polyvinylpyrrolidone, carboxyvinyl polymer, polyacrylic acid, sodium polyacrylate, polyacrylamide, Synthetic polymer compounds such as acrylic acid and methacrylic acid copolymers are listed. Among these, cellulose-based polymer compounds and gum-based polymer compounds are preferable in order to obtain a good hair feel when flowing after treatment. These thickeners can be used alone or in combination of two or more.

The thickener is contained in at least one of the first agent and the second agent, but is preferably contained in both the first agent and the second agent from the viewpoint of preventing dripping onto the skin. The blending amount of these thickeners is not particularly limited as long as the effect of the present invention is obtained, but is preferably 0.1 to 20% by mass in the blended agent, and more preferably. Is 0.5 to 10% by mass.

In the first agent and the second agent, an oily component, a surfactant, and the like can be blended as desired to improve the feel and the hair dyeing power, respectively.

Examples of oil components include avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, persic oil, wheat germ oil, sasanqua oil, castor oil, flaxseed oil, Safflower oil, cottonseed oil, eno oil, soybean oil, peanut oil, teaseed oil, kaya oil, rice bran oil, cinnagari oil, Japanese kiri oil, jojoba oil, germ oil, triglycerin, trioctanoic acid glycerin, tetraoctanoic acid pentaerythronium Liquid oils such as slit and glycerin triisopalmitate; hydrocarbon oils such as liquid paraffin, ozokerite, squalene, pristane, paraffin, ceresin, squalane, petrolatum, microcrystalline wax; isopropyl myristate, cetyl octanoate, octyldodecyl myristate , Palmitic Isopropyl, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyl decyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearylate, di- Ethylene glycol 2-ethylhexylate, dipentaerythritol fatty acid ester, monoisostearic acid-N-alkyl glycol, neopentyl glycol dicaprate, diisostearyl malate, glycerin di-2-heptylundecanoate, tri-2-ethylhexyl tris Methylolpropane, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexylate, triethyl-2-ethylhexyl Glycerin, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glycerin trimyristate, tri-2-heptylundecanoic acid glyceride, castor oil fatty acid methyl ester, oleic oil, cetostearyl alcohol Acetoglyceride, 2-heptylundecyl palmitate, N-lauroyl-L-glutamic acid-2-octyldodecyl ester, ethyl laurate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, ethyl acetate, butyl acetate, Synthetic ester oils such as amyl acetate and triethyl citrate; chain polysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane, and methylhydrogenpolysiloxane; octamethyl Examples include cyclic silicones such as cyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexanesiloxane. These oily components can be used alone or in combination of two or more.

The compounding amount of the oil component is preferably 0.01 to 10% by mass, more preferably 0.1 to 5% by mass for both the first agent and the second agent.

As the surfactant, a nonionic surfactant, an anionic surfactant, a cationic surfactant, an amphoteric surfactant, and the like can be arbitrarily selected.

Examples of the lipophilic nonionic surfactant include sorbitan monooleate, sorbitan monoisostearate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan sesquioleate, sorbitan trioleate, penta-2-ethylhexyl Sorbitan fatty acid esters such as diglycerol sorbitan acid, diglycerol sorbitan tetra-2-ethylhexylate; mono-cotton oil fatty acid glycerin, mono-erucic acid glycerin, glyceryl sesquioleate, glyceryl monostearate, diglycerin diisostearate, α, α ' -Glycerol polyglycerin fatty acids such as glyceryl oleate and glyceryl monostearate and malic acid monostearate; propylene glycol monostearate and the like Propylene glycol fatty acid esters; hydrogenated castor oil 誘体, and glycerin alkyl ether.

Examples of the hydrophilic nonionic surfactant include POE sorbitan fatty acid esters such as polyoxyethylene (POE) sorbitan monolaurate, POE sorbitan monostearate, POE sorbitan monooleate, and POE sorbitan tetraoleate; POE sorbite fatty acid esters such as rate, POE sorbite monooate, POE sorbite pentaoleate, POE sorbite monostearate; POE fatty acid esters such as POE monooleate and ethylene glycol distearate; POE lauryl ether, POE oleyl ether, POE POE alkyl ethers such as stearyl ether, POE behenyl ether, POE-2-octyldodecyl ether, POE cholestanol ether POE alkyl phenyl ethers such as POE octyl phenyl ether, POE nonyl phenyl ether, POE dinonyl phenyl ether; Pluronic types such as polyoxyethylene / polyoxypropylene (POP) glycol; POE / POP cetyl ether, POE / POP Monobutyl ether, POE / POP-2-decyltetradecyl ether, POE / POP monobutyl ether, POE / POP hydrogenated lanolin, POE / POP alkyl ethers, tetratronic POE / tetraPOP ethylenediamine condensates such as Tetronic; POE castor Oil, POE hydrogenated castor oil, POE hydrogenated castor oil monoisostearate, POE hydrogenated castor oil triisostearate, POE hydrogenated castor oil monopyroglutamic acid diester, POE hard POE castor oil derivatives such as castor oil maleic acid; POE beeswax and lanolin derivatives such as POE sorbite beeswax; alkanolamides such as coconut oil fatty acid diethanolamide, lauric acid monoethanolamide, fatty acid isopropanolamide; POE fatty acid amide, sucrose fatty acid ester , POE nonylphenyl formaldehyde condensate, alkylethoxydimethylamine oxide, trioleyl phosphoric acid and the like.

Examples of anionic surfactants include alkyl sulfate salts such as sodium lauryl sulfate, lauryl sulfate triethanolamine, ammonium lauryl sulfate, sodium cetyl sulfate, and sodium stearyl sulfate; POE lauryl ether sulfate, POE lauryl ether sulfate triethanolamine, Alkyl and alkylallyl ether sulfates such as POE lauryl ether ammonium sulfate, POE alkyl ether sodium sulfate, POE alkyl ether sulfate triethanolamine, POE alkyl ether sulfate diethanolamine, POE alkyl ether ammonium sulfate; hardened coconut oil fatty acid sodium glyceryl sulfate, higher fatty acid Sulfuric acid ester salt of alkylolamide, sulfated oil sulfated castor oil, POE laur Phosphorous such as ruether phosphoric acid, POE oleyl ether phosphoric acid, POE cetyl ether phosphoric acid, POE stearyl ether phosphoric acid, POE alkyl ether phosphoric acid, POE alkyl phenyl ether phosphoric acid, and salts thereof (sodium salt, triethanolamine salt) Acid ester salts; α-olefin sulfonates; sulfonates of higher fatty acid amides such as coconut oil fatty acid methyl taurine sodium and lauroyl rotyl taurine sodium; alkylbenzene sulfonate dodecyl benzene sulfonate triethanolamine, sodium sulfosuccinate, sulfosuccinate Disodium lauryl acid, disodium POE sulfosuccinate, disodium lauryl POE sulfosuccinate, disodium POE lauroyl ethanolamide ester sulfosuccinate, Sulfosuccinates such as undecylenoylamidoethylsulfosuccinate disodium, condensates of higher fatty acids and amino acids N-acyl sarcosine salts such as sodium lauroyl sarcosine, sodium N-lauroyl-L-glutamate, disodium N-stearoyl-L-glutamate Examples thereof include N-acyl glutamates such as sodium and sodium N-myristoyl-L-glutamate, sodium salts such as oleic acid, stearic acid, lauric acid and palmitic acid, potassium salts, triethanolamine salts and ammonium salts.

Examples of cationic surfactants include alkyl trimethyl ammonium chloride, lauryl trimethyl ammonium chloride, cetyl trimethyl ammonium chloride, cetyl trimethyl ammonium bromide, stearyl trimethyl ammonium chloride, stearyl trimethyl ammonium bromide, lauryl trimethyl ammonium bromide, dialkyl dimethyl ammonium chloride. , Dicetyldimethylammonium chloride, distearyldimethylammonium chloride, dicocoyldimethylammonium chloride, myristyldimethylbenzylammonium chloride, stearyldimethylbenzylammonium chloride, POE alkylamine, alkylamine salts, polyamine fatty acid derivatives, amyl alcohol fatty acid derivatives, benzal chloride Luconium, benzethonium chloride, etc. That.

Examples of amphoteric surfactants include glycine type amphoteric surfactants, aminopropionic acid type amphoteric surfactants, aminoacetic acid type surfactants, and sulfobetaine type amphoteric surfactants. For example, 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine, lauryl dimethylaminoacetic acid betaine, undecinoyl-carboxymethoxyethyl carboxymethyl imidazolinium betaine sodium, undecyl hydroxyethyl imidazolinium betaine sodium, undecyl -N-hydroxyethyl-N-carboxymethylimidazolinium betaine, alkyldiaminoethylglycine hydrochloride, stearyldihydroxyethylbetaine, stearyldimethylaminoacetate betaine, sodium stearyldimethylbetaine, bis (stearyl-N-hydroxyethylimidazoline) chlor Acetic acid complex, palm oil alkyl-N-carboxyethyl-N-hydroxyethylimidazolinium betaine Coconut oil alkyl-N-carboxyethoxyethyl-N-carboxyethyl imidazolinium disodium hydroxide, coconut oil alkyl-N-carboxymethoxyethyl-N-carboxyethyl imidazolinium disodium hydroxide, coconut oil alkyl- N-carboxymethoxyethyl-N-carboxyethyl imidazolinium disodium lauryl sulfate, coconut oil alkyl betaine, coconut oil fatty acid amidopropyl betaine, coconut oil fatty acid-N-carboxymethoxyethyl-N-carboxyethyl imidazolinium betaine sodium, Laurylaminopropionate triethanolamine, β-laurylaminopropionate sodium, lauryl N-carboxymethoxyethyl-N-carboxymethylimidazolinium dinatriau Examples include mudodecanoyl sarcosine, sodium lauryldiaminoethylglycine, amidopropyl betaine laurate solution, and the like.

The surfactant is used as a dispersant, a solubilizer, an emulsifier, and a touch improver, and the blending amount of both the first agent and the second agent is preferably about 0.01 to 10% by mass.

The hair dye of the present invention is other components usually used in hair dyes and hair dyes, for example, sequestering agents, protein hydrolysates, preservatives, perfumes, and pigments, as long as the effects of the present invention are not impaired. , Fatty acids, esters and the like can be appropriately blended.

The hair dyeing method of the present invention is a hair dyeing method characterized in that the first agent and the second agent are separately dyed on the hair using the basic hair dye and the acidic hair dye. It consists of a first stage for dyeing the second agent on the hair and a second stage for dyeing the remaining second agent or first agent different from the first stage on the hair, and the second stage after the first stage. In this method, the hair is dyed by washing, and the hair can be washed away and dried or heated between the first stage and the second stage. Hair dyeing is preferably performed at 30 ° C. to 50 ° C. and allowed to penetrate into the hair over 5 to 30 minutes. After dyeing, the extra first and second agents are removed from the hair by means such as washing away. It is preferable to remove.

Hereinafter, the present invention will be described in detail based on examples, but the present invention is not limited thereto. In addition, a compounding quantity shows the mass%. The ratio between the first agent and the second agent was changed, and the two-stage dyeing was alternately performed in Examples 1 to 7, only the basic dye, and the acid dye alone in Comparative Examples 1 and 2, and the basic dye and A dyed acid dye in the same bath is shown in Comparative Example 3.

About Example 1-7 of Table 1, and Comparative Examples 1-3, each component was adjusted and the 1st agent and the 2nd agent were obtained, respectively. Comparative Example 3 is a preparation containing a basic dye and an acid dye. Subsequently, Examples 1 to 3 and 7 take 10 parts by mass of the first agent with respect to 1 part by mass of hair as the first stage, dye it at 45 ° C. for 20 minutes, and after washing with water, 1 mass of hair as the second stage. 10 parts by mass of the second agent was taken for each part, dyed at 45 ° C. for 20 minutes, washed with water and dried to obtain a specimen. In Examples 4 to 6, specimens were obtained in the same manner as in Examples 1 to 3, except that the second agent was used as the first step and the first agent was used as the second step. In Comparative Example 1, 10 parts by mass of the first agent was taken per 1 part by mass of hair, dyed at 45 ° C. for 20 minutes, washed with water and dried to obtain a specimen. In Comparative Example 2, 10 parts by mass of the second agent was taken per 1 part by mass of the hair, dyed at 45 ° C. for 20 minutes, washed with water, and dried to obtain a specimen. In Comparative Example 3, 10 parts by mass of the preparation was taken for 1 part by mass of the hair, dyed at 45 ° C. for 20 minutes, washed with water and dried to obtain a specimen. Subsequently, hair dyeing power and shampoo / treatment resistance were evaluated by the following evaluation methods. The results are shown in Table 1. The hair used was 100% BM-W white hair manufactured by Beaulux Co., Ltd.

The hair dyeing power was evaluated by measuring the spectral reflectance with a spectrocolorimeter JS555 manufactured by Color Techno System Co., Ltd. and determining the optical density K / Sd by the following Kbeluka-Munk equation. A higher K / Sd value indicates a higher concentration and a higher hair dyeing power.
ΣK / S _λ = Σ (1−R _λ ) ² / 2R _λ
R _λ : reflectance (%) / 100
λ: 380~780nm of 10nm interval K / Sd = hair of ΣK / S _λ - white hair of ΣK / S _λ

The shampoo / treatment resistance was evaluated by determining the K / Sd ratio (residual rate%), color difference (ΔE *) and chroma difference (ΔH *) of the following shampoo / treatment resistance test specimens relative to the untested specimens. ΔE * and ΔH * were determined by the following formulas obtained by measuring L *, a *, and b * with a spectrocolorimeter JS555 manufactured by Color Techno System Co., Ltd. Smaller ΔE * indicates less discoloration, and smaller ΔH * indicates less hue change, indicating superior shampoo and treatment resistance.

Shampoo / treatment resistance test:
The sample was subjected to the following shampoo treatment, washed with water, further subjected to the following treatment treatment, washed with water, and this treatment was repeated 5 times.
<Shampoo treatment>
Shampoo solution 5% sodium lauryl sulfate aqueous solution Bath ratio 1:10 (10 parts by mass of shampoo solution per 1 part by mass of hair dye)
Temperature time 45 ℃ × 20min
<Treatment treatment>
Treatment solution 5% stearyltrimethylammonium chloride aqueous solution Bath ratio 1:10 (10 parts by mass of shampoo solution per 1 part by mass of hair dye)
Temperature time 45 ℃ × 20min

なお、Ｌ*、ａ*、ｂ*の添字０および１は、それぞれシャンプー・トリートメント処理前および処理後の測定値を表す。 Formula for calculating ΔE * and ΔH *:

Note that subscripts 0 and 1 of L *, a *, and b * represent measurement values before and after the shampoo treatment, respectively.

Table 1 shows the test results of Examples 1 to 7 and Comparative Examples 1 to 3.

The two-stage dyeing black of Examples 1 to 7 is more than the basic dye black of Comparative Example 1 alone, the acidic dye black of Comparative Example 2 and the basic dye / acid dye same bath dye black of Comparative Example 3, The residual rate% was high, and the color difference (ΔE *) and saturation difference (ΔH *) were also small, and an effect of improving shampoo treatment resistance was recognized.
It should be noted that the acid dye-containing second agent post-dyeing of Examples 1 to 3 and Example 7 had a smaller ΔH * than the basic dye-containing first agent post-dying of Examples 4 to 6, and the hue after the test. Less change and more effective.

The present invention provides an alternate two-stage hair dye and an alternate two-stage hair dyeing method that have good hair dyeing power, little color change and excellent shampoo treatment resistance to keratin fibers such as human hair. .

Claims (6)

A hair dye comprising a basic dye and a first agent for hair dyeing adjusted to pH 5 to 8 and an acid dye and a second agent for hair dyeing adjusted to pH 2 to 4. Any one of the first agent and the second agent is used for pre-dying, and the other one is used for post-dying. The alternating two-stage hair dye according to claim 1, wherein an organic solvent is contained in at least one of the first agent and the second agent. The alternating two-stage hair dye according to claim 1 or 2, wherein a polymer thickener is contained in at least one of the first agent and the second agent. The alternating two-stage hair dye according to any one of claims 1 to 3, comprising one or more aromatic alcohols as an organic solvent. The alternating 2 in any one of Claim 1 thru | or 4 formed by mix | blending 1 type, or 2 or more types chosen from an oil-based component and surfactant in at least one of said 1st agent and said 2nd agent. Stage hair dye. Using a hair dye comprising a basic dye and a first agent for hair dyeing adjusted to pH 5 to 8 and an acid dye and a second agent for hair dyeing adjusted to pH 2 to 4 The first step of dyeing the hair with one of the first agent and the second agent and washing with water, and the second step of dyeing after dyeing the other one with hair and washing with water An alternate two-stage hair dyeing method characterized by comprising: