JP5404152B2 - Hair dyeing pretreatment composition and hair dyeing pretreatment method - Google Patents

Description

  The present invention relates to a hair dyeing pretreatment composition and a hair dyeing pretreatment method. More specifically, the present invention relates to a pre-dyeing agent composition and a hair dye which can prevent a problem on hair dyeing due to the residual metal in performing hair dyeing treatment on hair in which metal remains. It relates to a pretreatment method.

  As well-known hair dyes for white hair dyeing, as is well known, oxidative hair dyes containing oxidative dyes, hair dyes containing direct dyes such as acid dyes and basic dyes, and metal hair using metal coloring Agents and the like are known. Since each of these hair dyes has advantages and disadvantages, the user selects and uses them as necessary.

  Among the above-mentioned hair dyes, as a metal hair dye, a “tooth-black” type hair dye that forms a colored complex compound by the reaction of iron salt and polyphenols such as tannin, and silver, Silver hair dyes that dye hair by utilizing the interaction of hair proteins are known. These metal hair dyes are generally advantageous in that they can be easily dyed. Therefore, for example, when the color tone of hair dyed with an oxidative hair dye is slightly faded, a metal hair dye is often used as a connection until the next oxidative hair dyeing treatment is performed.

JP-T-2004-524333. This patent document 1 relates to an oxidizing composition containing a chelating agent and a conditioning agent, and a hair treatment method. Specifically, the composition containing a high concentration of chelating agent removes metal ions on the hair surface before oxidative hair dyeing treatment, thereby suppressing the generation of free radicals from hydrogen peroxide during oxidative hair dyeing treatment. And the technique of reducing the damage of hair is disclosed.

JP-A-5-78229. This patent document 2 relates to a hair bleaching agent. Specifically, it discloses a hair bleaching agent that uses the reducing action of ascorbic acid or a derivative thereof without using an oxidizing agent to decolorize hair.

  However, when the hair dyed with a metal hair dye is subjected to the next oxidation hair dyeing treatment as described above, there is a problem of hair dye inhibition that the oxidation hair dye does not develop a color and tone as designed. It was. Specifically, for example, a phenomenon in which the hair color tone that should be dark brown hardly feels brownish and becomes greenish is recognized. The reason is considered as follows.

  That is, the metal hair dye has a high persistence in the hair, and the metal component remains in the hair for a long time. Oxidative hair dyes, on the other hand, are designed to color by oxidizing and polymerizing a dye base such as paraphenylenediamine and a coupler such as resorcin in the presence of an oxidizing agent such as hydrogen peroxide in the hair as is well known. Has been. And when an oxidation hair dye is applied in the state in which the metal component remained in the hair, the metal component promotes the decomposition of the oxidant. As a result, (1) Oxidation / polymerization of the dye in the hair is uneven, and the color development polymerization is not as expected. (2) Oxidation agent penetration into the hair is insufficient. The performance is insufficient, greatly affecting the color of hair dyeing. (3) According to the color tone designed from the viewpoint that the metal component itself remaining on the hair exhibits a so-called structural color on the appearance due to light interference. It is thought that it does not develop color.

  Such a problem of hair dye inhibition itself has been recognized for some time, not a novel finding of the present inventors. However, the inventor of the present application does not know a case in which this problem has been solved in the past as a technical problem.

  Furthermore, although the reason is not clear, when the hair dyed with a metal hair dye is subjected to the next oxidative hair treatment as it is, the strength and feel of the hair after the oxidative hair treatment tends to be impaired.

  However, in the above-mentioned Patent Document 1, although “removes metal ions on the hair surface”, the metal ions in this case are trace amounts of heavy metal ions originally present on the hair surface, and after use of the metal hair dye. Much less than the metal component remaining in the hair, and the chelating agent captures metal ions, but cannot capture non-ionic metal components (metal fine particles) remaining after using the metal hair dye. . Therefore, as can be seen from the evaluation as a comparative example in the example column described later, the invention of Patent Document 1 cannot solve the problem of hair dye inhibition.

  Regarding the above-mentioned Patent Document 2, in relation to the above-mentioned problem, the destaining agent is a substance that decomposes the dye polymer formed inside the hair. There is no direct contact with ensuring hair color. Therefore, as can be seen from the evaluation as a comparative example in the Examples section described later, the problem of hair dye inhibition cannot be solved by the reducing action of ascorbic acid.

  Furthermore, although not presented as a prior art document, metal hair dyes using silver are commercially available, and in the sale, "If an oxidative hair dye is used after use of the metal hair dye, the hair turns green. In such a case, it is recommended to treat the hair with a bath containing sulfur.

  However, in this case, it is not a prevention against hair dyeing inhibition that the hair turns green, but a post-treatment proposal, and as can be seen from the evaluation as a comparative example in the example column described later, such a sulfur-containing agent is dyed. Even if used to prevent hair inhibition, no effect can be expected. In addition, sulfur-containing agents are impractical because they smell and are expected to cause considerable damage to the hair.

  Therefore, the present invention solves the problem of hair inhibition that the coloring and color tone in the oxidative hair treatment does not develop as designed due to the metal remaining in the hair. It is a technical problem to be solved to provide means capable of maintaining good strength and feel.

  In the process of pursuing the means for solving such technical problems, the present inventor applied a composition containing cystine and a certain alkaline substance to hair as a pretreatment for the oxidative hair dyeing treatment as described above. Effectiveness was found and the present invention was completed.

(First invention)
The configuration of the first invention of the present application for solving the above-mentioned problems is a composition for pretreatment when performing oxidative hair dyeing treatment on hair in which metal remains, and comprises the following (A) component and (B) It is a hair dyeing pretreatment composition containing a component.

  (A) Component: Cystine.

  Component (B): One or more selected from aqueous ammonia and primary to tertiary amines.

(Second invention)
The structure of the second invention of the present application for solving the above problem is that the mass ratio of the component (A) to the component (B) in the first invention [28% ammonia water when the component (B) is ammonia water] The hair dye pretreatment composition is calculated as the mass of [A] / (B) = 0.2 to 0.5.

(Third invention)
The structure of the third invention of the present application for solving the above problem is that the primary to tertiary amine in the first invention or the second invention corresponds to any one of the following (1) to (4). It is a pretreatment agent composition.

(1) General formula NR ₁ R ₂ R ₃ (In the general formula, each of R _{1 to} R ₃ represents a hydrogen atom or a linear or branched, saturated or unsaturated hydrocarbon group having 1 to 6 carbon atoms. Any hydrogen atom in the hydrocarbon group may be substituted with a hydroxyl group, and not all of R _{1 to} R ₃ are hydrogen atoms).

  (2) The molecular weight is 200 or less.

  (3) It is liquid at 25 ° C.

  (4) Any of monoethanolamine, monoisopropanolamine, diethanolamine, triethanolamine, 2-amino-2-methyl-1-propanol.

(Fourth invention)
The composition of the fourth invention of the present application for solving the above-mentioned problems is that the hair dye pretreatment composition described in any one of the first invention to the third invention is used for performing the oxidative hair dyeing treatment on the hair in which the metal remains. This is a hair dyeing pretreatment method in which pretreatment is performed using a product.

(Fifth invention)
The configuration of the fifth invention of the present application for solving the above problem is a hair dyeing pretreatment method in which the metal remaining on the hair is silver in the fourth invention.

  Due to the metal remaining in the hair, as described in the section “Problems to be Solved by the Invention”, during the subsequent oxidation hair treatment, the oxidation hair dye does not color as designed. There is a problem of hair inhibition. The cause is that the metal component decomposes the oxidant in the oxidative hair dye (1) lack of oxidation and polymerization of the dye in the hair, (2) lack of penetration of the oxidant into the hair, Furthermore, (3) expression of a structural color based on light interference of a metal component remaining on the hair can be considered.

  According to the hair dyeing pretreatment composition and the hair dyeing pretreatment method according to the present invention, the above-described problem of hair dyeing inhibition can be solved. The reason why such an effect is obtained is not clearly understood, but the cystine (Component (A)) is swollen by the component (B). As a result, it is presumed that the decomposition of the oxidant in the oxidative hair dye is suppressed, and the structural color based on the light interference of the metal is also suppressed.

  The hair dyeing pretreatment composition and hair dyeing pretreatment method of the present invention are preferably applied to hair in which metal remains, and a typical example thereof is a hair dyeing treatment with a metal hair dye. Although it is received hair, it is preferably applied to hair in which metal (metal fine particles) remains due to various other causes.

  As the component (B), one or more selected from aqueous ammonia and primary to tertiary amines can be preferably used, and the primary to tertiary amines are particularly (1) of the third invention. Those defined in any one of (4) are preferred.

  The mass ratio of the content of the component (A) and the component (B) in the hair dyeing pretreatment composition is not necessarily limited, but is within the range of (A) / (B) = 0.2 to 0.5. It is preferable. If the (A) / (B) value is less than 0.2, the effect of the present invention tends to be insufficient depending on the hair quality. If this value exceeds 0.5, the component (A) may be present depending on the preparation. There is a possibility that it cannot be stably blended.

  The hair dyeing pretreatment method of the present invention is particularly preferably applied when silver remains on the hair due to the use of a metal hair dye using silver.

  In addition, according to the hair dyeing pretreatment composition and hair dyeing pretreatment method of the present invention, the strength and feel of the hair after finishing in the oxidative hair dyeing treatment are also maintained well.

  Next, modes for carrying out the present invention will be described including the best mode.

[Hair dyeing pretreatment composition]
The hair dyeing pretreatment composition of the present invention is a composition for pretreatment when performing oxidative hair dyeing treatment on hair in which metal remains.

  Here, “hair in which metal remains” is typically exemplified by hair that has been subjected to hair dyeing treatment with a metal hair dye, but hair in which metal (metal fine particles) remains due to various other causes. Is also included. The type of the remaining metal is not necessarily limited. For example, when the residual metal is silver, such as hair dyed with a metal hair dye using silver, the hair dyeing pretreatment composition of the present invention is used. Particularly preferably applied. “Oxidative hair dyeing” refers to a process of dyeing hair using an oxidation process with an oxidizing agent, such as a hair coloring treatment with an oxidizing hair dye.

  The pH of the hair dyeing pretreatment composition can be arbitrarily set, for example, about pH 9-13. The pH adjustment method is not particularly limited, and may be adjusted with a generally used acid or alkali. It is also possible to give buffering ability to the hair dyeing pretreatment composition.

  The hair dyeing pretreatment composition can be in various dosage forms such as liquid, emulsion, cream, gel, paste, mist or aerosol foam.

  The hair dye pretreatment composition of the present invention contains at least the essential components described below, and may optionally contain other various components as long as the effects of the present invention of preventing hair dyeing are not hindered. it can.

[Essential component of hair dye pretreatment composition]
The hair dye pretreatment composition of the present invention contains the following components (A) and (B) as essential components.

  The component (A) is cystine. Incidentally, cystine is a disulfide bond of two molecules of cysteine, which is a sulfur-containing amino acid. However, as shown in the examples below, the effects of the present invention cannot be obtained even if cysteine is added instead of cystine.

  The component (B) is at least one selected from aqueous ammonia and primary to tertiary amines. Although the kind of primary to tertiary amine is not limited, it is preferably one of the following (1) to (3).

(1) General formula NR ₁ R ₂ R ₃ (In the general formula, each of R _{1 to} R ₃ represents a hydrogen atom or a linear or branched, saturated or unsaturated hydrocarbon group having 1 to 6 carbon atoms. Any hydrogen atom in the hydrocarbon group may be substituted with a hydroxyl group, and not all of R _{1 to} R ₃ are hydrogen atoms).

  (2) The molecular weight is 200 or less.

  (3) It is liquid at 25 ° C.

  (4) Any of monoethanolamine, monoisopropanolamine, diethanolamine, triethanolamine, 2-amino-2-methyl-1-propanol.

  The content of the component (A) in the hair dyeing pretreatment composition is not particularly limited, but is in the range of 0.1 to 5% by mass, particularly in the range of 0.5 to 2% by mass in the composition. It is preferable. If the content of the component (A) is less than 0.1% by mass, there is a possibility that a sufficient prevention effect against hair dyeing inhibition cannot be ensured due to the lack of active ingredients. And it is useless.

  The content of the component (B) in the hair dyeing pretreatment composition is not particularly limited, but may be in the range of 0.2 to 10% by mass, particularly in the range of 1 to 4% by mass in the composition. preferable. When the content of the component (B) is less than 0.2% by mass, there is a possibility that a sufficient prevention effect against hair dyeing inhibition cannot be ensured due to insufficient swelling of the hair, and conversely if it exceeds 10% by mass, the hair is damaged. Etc. tend to occur.

  The mass ratio of the component (A) and the component (B) in the hair dyeing pretreatment composition is not necessarily limited, but for the reason described in the “Effect of the invention” column, (A) / (B) It is preferable to be within the range of = 0.2 to 0.5. When the component (B) is ammonia water, the mass ratio of (A) / (B) is calculated as the mass of 28% ammonia water.

[Other components in hair dye pretreatment composition]
In the hair dyeing pretreatment composition of the present invention, various known components can be arbitrarily blended in appropriate blending amounts as long as the effects of the present invention are not hindered. For example, oily components, surfactants, polymer substances, polypeptides, protein hydrolysates, sequestering agents, antioxidants, fragrances, bactericides / preservatives, anti-inflammatory agents, UV absorbers, propellants, thickeners, A coloring agent etc. can be arbitrarily mix | blended. Moreover, water is mix | blended as a solvent or dispersion medium of each component of the hair dye pretreatment composition, and the concentration (mass percentage) of each component is adjusted. Some of these ingredients are described in detail below.

(Oil component)
Examples of the oil component include hydrocarbons, polyhydric alcohols, waxes, fats and oils, higher alcohols, higher fatty acids, alkyl glyceryl ethers, esters, silicones, and the like. One of these can be blended alone, or two or more can be blended together.

  Examples of the hydrocarbon include paraffin, polyethylene powder, microcrystalline wax, petrolatum and the like. Examples of hydrocarbons that are liquid at room temperature include α-olefin oligomers, light isoparaffins, light liquid isoparaffins, synthetic squalane, vegetable squalane, squalane, polybutene, liquid isoparaffin, and liquid paraffin.

  Examples of the polyhydric alcohol include glycols and glycerins. Examples of glycols include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, isoprene glycol, and 1,3-butylene glycol. Examples of glycerins include glycerin, diglycerin, and polyglycerin.

  Examples of waxes include beeswax, candelilla wax, carnauba wax, jojoba oil, lanolin, whale wax, rice bran wax, sugar cane wax, palm wax, montan wax, cotton wax, bayberry wax, ibota wax, kapok wax, shellac wax and the like. it can.

  Examples of the oils and fats include vegetable oils such as macadamia nut oil and animal oils.

  Higher alcohols include lauryl alcohol, myristyl alcohol, cetyl alcohol (cetanol), stearyl alcohol, cetostearyl alcohol, aralkyl alcohol, behenyl alcohol, 2-hexyldecanol, isostearyl alcohol, 2-octyldodecanol, decyltetradecanol, oleyl Alcohol, linoleyl alcohol, linolenyl alcohol, lanolin alcohol, etc. are mentioned.

  Examples of higher fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, isostearic acid, hydroxystearic acid, 12-hydroxystearic acid, oleic acid, undecylenic acid, linoleic acid, ricinoleic acid, and lanolin fatty acid. It is done.

  Examples of the alkyl glyceryl ether include batyl alcohol (monostearyl glyceryl ether), chimyl alcohol (monocetyl glyceryl ether), selachyl alcohol (monooleyl glyceryl ether), and isostearyl glyceryl ether.

  Esters include various glycerin-based vegetable oils such as soybean oil, olive oil, hydrogenated castor oil, polyhydric alcohol fatty acid esters such as pentaerythritol-based fatty acid esters, diisopropyl adipate, diisobutyl adipate, dioctyl adipate, and adipic acid 2-hexyldecyl, diisostearyl adipate, isopropyl myristate, cetyl octanoate, cetyl isooctanoate, isononyl isononanoate, isodecyl isononanoate, isotridecyl isononanoate, diisopropyl sebacate, octyldodecyl myristate, isopropyl palmitate, stearin Butyl acid, stearyl stearate, hexyl laurate, myristyl myristate, decyl oleate, hexyl decyl dimethyloctanoate, and myristic acid Isodecyl, isostearyl myristate, 2-ethylhexyl palmitate, octyldodecyl ricinoleate, fatty acid (C10-30) (cholesteryl / lanosteryl), lauryl lactate, cetyl lactate, myristyl lactate, octyldodecyl lactate, lanolin acetate, stearic acid Isocetyl, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexanoate, dipentaerythritol fatty acid ester, N-alkyl glycol monoisostearate, cetyl caprate, glyceryl tricaprylate, neopentyl glycol dicaprate , Diisostearyl malate, lanolin derivatives and the like.

  Examples of silicones include methylpolysiloxane, dimethylpolysiloxane, methylphenylpolysiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, highly polymerized silicone having an average polymerization degree of 650 to 10,000, amino-modified silicone, and polyether-modified silicone. , Betaine-modified silicone, alkyl-modified silicone, alkoxy-modified silicone, mercapto-modified silicone, carboxy-modified silicone, trimethylsiloxysilicic acid, methylhydrogenpolysiloxane and the like. Examples of amino-modified silicones include aminopropylmethylsiloxane / dimethylsiloxane copolymer (aminopropyldimethicone), aminoethylaminopropylsiloxane / dimethylsiloxane copolymer (amodimethicone), aminoethylaminopropylmethylsiloxane / dimethylsiloxane copolymer. (Trimethylsilylamodimethicone) and the like.

(Surfactant)
Examples of the surfactant include cationic surfactants, nonionic surfactants, anionic surfactants and amphoteric surfactants other than the above-described cured castor oil fatty acid ester derivatives. One of these can be blended alone, or two or more can be blended together.

  Cationic surfactants include lauryl trimethyl ammonium chloride, cetyl trimethyl ammonium chloride, stearyl trimethyl ammonium chloride, distearyl dimethyl ammonium chloride, behenyl trimethyl ammonium methyl sulfate, tri (polyoxyethylene) stearyl ammonium chloride, quaternium-91 (INCI). Name), behenyltrimethylammonium chloride, distearyldimethylammonium chloride, ethyl lanolin sulfate fatty acid amidopropylethyldimethylammonium bromide, cetyltrimethylammonium bromide, stearyltrimethylammonium bromide, stearyltrimethylammonium saccharin, cetyltrimethylammonium saccharin, N, N- Di (acyloxy), N- (hydroxyethyl), N-methyl Nmo methosulfate, and the like.

  Nonionic surfactants include various POE alkyl ethers such as polyoxyethylene (hereinafter referred to as POE) cetyl ether, POE alkylphenyl ethers, POE / polyoxypropylene alkyl ethers, POE sorbitan fatty acid esters, And aliphatic alkanolamides such as POE propylene glycol fatty acid ester and coconut oil fatty acid diethanolamide.

  Examples of anionic surfactants include alkyl sulfates such as sodium lauryl sulfate, POE alkyl sulfates such as sodium laureth sulfate, alkyl sulfate esters such as lauryl sulfate triethanolamine, stearoylmethyl taurine sodium, dodecylbenzenesulfonic acid triethanol Examples include amines, sodium tetradecene sulfonate, POE lauryl ether phosphoric acid and salts thereof, N-lauroyl glutamates, and N-lauroylmethyl-β-alanine salts.

  Examples of amphoteric surfactants include 2-undecyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine sodium, cocamidopropyl betaine, lauryldimethylaminoacetic acid betaine, and the like.

(Polymer substance)
Examples of the polymer substance include cationic polymers such as cationized cellulose, anionic polymers such as carboxyvinyl polymer, amphoteric polymers such as diallyl quaternary ammonium salt / acrylic acid copolymer, and various water-soluble polymers. . One of these can be blended alone, or two or more can be blended together.

  Specific examples of water-soluble polymers include vegetable polymers such as gum arabic, xanthan gum, carrageenan, pectin, agar, starch, microbial polymers such as dextran and pullulan, animal polymers such as collagen, casein and gelatin, methylcellulose, hydroxy Cellulose polymers such as ethyl cellulose are exemplified, and other examples include sodium alginate, polyoxyethylene polymer, sodium polyacrylate, polyacrylamide polydimethylmethylene piperidinium chloride and the like.

(Polypeptide, protein hydrolyzate)
Polypeptides include proteins such as collagen, keratin, elastin, fibroin, egg, silk, conchiolin, casein, gelatin, rice, wheat, barley, oats, soybeans, peas, almonds, Brazil nuts, potatoes and corn. Examples include the resulting protein. Examples of the protein hydrolyzate include protein hydrolysates obtained by hydrolyzing the above-mentioned various proteins with acid, alkali, enzyme, or the like.

[Dye pre-treatment method]
The hair dyeing pretreatment method of the present invention is a method of performing a pretreatment using any one of the hair dyeing pretreatment compositions prior to performing an oxidative hair dyeing treatment on hair in which metal remains. As a method for applying the hair dyeing pretreatment composition, there can be employed a method of uniformly applying to the hair as a pretreatment agent, leaving it for a while and drying it as it is, or washing it with water and drying it.

  The meaning of “hair where metal remains”, the type of metal remaining on hair, the meaning of “oxidative hair dyeing treatment” and the like are as described above in relation to the pre-dyeing agent composition.

  Examples of the present invention will be described below together with comparative examples. The technical scope of the present invention is not limited by the following examples and comparative examples.

[Metal hair dye treatment]
As a hair bundle sample for treatment, necessary number of 15 cm long hair bundles made of 100% human hair manufactured by Beaulux Co., Ltd. was prepared, and the composition shown in Table 1 at the end of these hair bundle samples was prepared. A metal hair dye was applied in an amount of 0.2 g per gram of hair bundle, and in that state, irradiation of an artificial sun lamp for 6 hours was repeated a total of 7 times. By the above treatment, each hair bundle sample was colored red and black.

  In Table 1 and other tables described later, the numerical values described in the column indicating the blending amounts of the components all represent “mass%”.

[Treatment for the first group of hair bundle samples]
A part of the hair bundle sample group that has been subjected to the above-described metal hair dye treatment is referred to as a “first group of hair bundle samples”, and the last group of hair bundle samples are shown in Tables 2 to 4 at the end. Each of the hair dyeing pretreatment agents having the compositions according to Examples 1 to 13 and Comparative Examples 1 to 7 shown in the drawings was applied in an amount of 0.2 g per 1 gram of hair bundle, and then pretreated to be naturally dried. .

  In Tables 2 to 4, “A” in the “component” column is the component (A) of the present invention, and “B” is the component (B) of the present invention. , "A" is a component for comparison with the component (A) of the present invention, and "b" is a component for comparison with the component (B) of the present invention. , Respectively.

  Next, “Vigen Cream Tone 4G” which is a commercially available oxidative hair dye manufactured by Hoyu Co., Ltd. is used for the first group of hair bundle samples according to each of the examples and comparative examples subjected to the above pretreatment. The oxidative hair dyeing was performed according to a conventional method.

[Treatment for the second group of hair bundle samples]
Another part of the hair bundle sample group that has been subjected to the metal hair dye treatment is referred to as a “second group of hair bundle samples”. For these second group of hair bundle samples, the first group of hair bundles Unlike the case of the sample, (1) The treatment with a two-component bleaching agent showing the composition as the first agent and the second agent is shown in Table 5 at the end according to a conventional method (shown as Comparative Example 8 in Table 4). Alternatively, (2) treatment with a two-component type decoloring agent having a composition as the first agent and the second agent in Table 6 at the end was performed according to a conventional method (shown as Comparative Example 9 in Table 4). The above-mentioned two-part bleaching agent is prepared by mixing so that the ratio of one part: two parts = 1: 3 in a mass ratio immediately before use, and the above-mentioned two-part type decoloring agent is used. Immediately before, the mixture is prepared so that the mass ratio is 1 agent: 2 agent = 10: 1.

  Next, in the same manner as in the case of the first group of hair bundle samples, the oxidation hair treatment using the oxidation hair dye “Vigen Cream Tone 4G” was performed according to a conventional method.

[Comparison hair sample]
Still another part of the hair bundle sample group that has been subjected to the metal hair dye treatment is referred to as a “comparison hair bundle sample”, and for these, the hair bundle sample of the first group and the hair bundle sample of the second group Without performing the pretreatment as in the case, the oxidative hair dyeing treatment using the oxidative hair dye “Vigen Cream Tone 4G” was carried out according to a conventional method.

[Evaluation]
About the hair bundle samples of the first group and the second group according to the respective examples and the comparative examples that have been subjected to the above treatment, the following “hair dyeing inhibition effect”, “strength of finished hair”, “finish” The “feel of the hair after” was evaluated, and the evaluation results are shown in the corresponding Examples and Comparative Examples columns.

(Hair dye inhibition prevention effect)
The hair dyeing degree and color tone of the hair bundle samples according to each example and each comparative example, in comparison with the hair bundle sample for comparison, two points when “the hair dyeing degree is good and the color tone is as designed”, One point was given when the hair dyeing degree was slightly better and the color tone was slightly different from the design, and 0 points were given when the hair dyeing degree and color tone are equivalent to the comparative hair bundle sample.

  Then, 10 expert panelists scored according to the above scoring criteria, and evaluated as “◯” if the total score of all panelists is 15 points or more, “△” if 7 to 14 points, and “×” if it is 6 points or less. The results are shown in Tables 2-4.

(Strength of finished hair)
Using a tensile tester “Tensilon UTM-II” manufactured by Toyo Baldwin, the break stress values of the hair bundle samples according to the respective examples and the comparative examples were measured in water. The measured value is high in comparison with the measured value of the comparative hair bundle sample, “○” when the strength is improved, “△” when the strength is equivalent, and “×” when the strength is decreased. The evaluation results are shown in Tables 2 to 4.

(Feeling of the hair after finishing)
About the hair | bristle bundle sample which concerns on each Example and each comparative example, ten expert panelists evaluated the touch by hand. In comparison with the comparative hair bundle sample, 2 points were given when “feel was good”, 1 point was given when “feel was not much changed”, and 0 point was given when “feel was poor”. The evaluation results are shown in Tables 2 to 4 as “◯” when the total score of 10 professional panelists is 15 or more, “Δ” when 7 to 14 points, and “X” when 6 points or less.

  According to the present invention, a hair dyeing pretreatment composition and a hair dyeing pretreatment method are provided that can prevent hair defects caused by residual metal when performing hair dyeing treatment on hair in which metal remains.

Claims (4)

A composition for pretreatment when performing oxidative hair treatment on hair in which silver remains, and comprises the following components (A) and (B): object.
(A) Component: Cystine.
Component (B): ammonia water and general formula NR ₁ R ₂ R ₃ (in the general formula, R _{1 to} R ₃ are each a hydrogen atom or a linear or branched, saturated hydrocarbon having 1 to 6 carbon atoms. 1 selected from primary to tertiary alkanolamines represented by the following formula: wherein at least one hydrocarbon group has a hydroxyl group, and R _{1 to} R ₃ are not all hydrogen atoms) More than seeds. The mass ratio of the component (A) to the component (B) [calculated as the mass of 28% ammonia water when the component (B) is ammonia water] is (A) / (B) = 0.2 to The hair dyeing pretreatment composition according to claim 1, wherein the composition is within a range of 0.5. Hair dye pretreatment agent composition according to claim 1 or claim 2 wherein the primary to tertiary alkanol amine is equal to or corresponding to the lower SL.
Any of monoethanolamine, monoisopropanolamine, diethanolamine, triethanolamine, 2-amino-2-methyl-1-propanol. When performing oxidative hair dyeing on the hair in which silver remains, the hair dyeing is characterized by performing pretreatment using the hair dyeing pretreatment composition according to any one of claims 1 to 3. Pre-processing method.