Hair deformation treatment agent

Abstract

To provide a hair deformation treatment agent which can achieve a good hair deformation effect while reducing damage to the hair, and which realizes uniform hair deformation in both damaged and less damaged areas of the hair.SOLUTION: A hair deformation treatment agent contains a reducing agent and isopropanol, where the content of isopropanol is 1-40 mass%, and where the alkalinity defined by the consumption of 0.1 N hydrochloric acid standard solution is 0.4-3.0 mL / g.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a hair deformation treatment agent used in hair deformation treatments such as waving and hair straightening, the first agent containing a reducing agent. [Background technology]

[0002] In hair transformation treatments involving reduction treatment of hair, such as permanent wave treatment and straight perm treatment, the hair is oxidized after the reduction treatment to fix the transformation.

[0003] In addition to the above-mentioned permanent wave treatment and straight perm treatment, hair is known to be damaged by treatments such as washing, brushing, using a hair dryer, hair coloring, and bleaching, as well as environmental stresses such as dryness and ultraviolet rays. There is a problem in that if such damaged hair is treated with a permanent wave treatment or a straight perm treatment in a normal highly alkaline state, the damage will progress.

[0004] Therefore, a hair transformation treatment agent has been proposed to avoid such inconvenience. More specifically, a hair transformation treatment agent has been proposed that contains a reducing agent and an alkaline agent, contains 0.0001% by weight or more and 0.005% by weight or less of iron chlorophyllin sodium, and contains 0.0025% by weight or more and 0.01% by weight or less of copper chlorophyllin sodium. It is described that the use of such a hair transformation treatment agent can increase the wave forming power (wave efficiency) of hair, thereby reducing the amount of alkaline agent used and suppressing damage to hair (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 4182101 Summary of the Invention [Problem to be solved by the invention]

[0006] However, although the above-mentioned Patent Document 1 contains porphyrins (iron chlorophyllin sodium and copper chlorophyllin sodium), these porphyrins have an insufficient hair transforming effect, and therefore there is a problem that hair damage is not sufficiently reduced.

[0007] Furthermore, when a hair deformation treatment is performed on damaged hair, the penetration of the hair deformation treatment agent into the damaged areas is excessively promoted, resulting in greater hair deformation and making it difficult to deform the hair evenly between the damaged areas, which are often found at the ends of the hair, and the less damaged areas near the roots of the hair. However, in the above-mentioned Patent Document 1, there was a problem in that it was difficult to deform the hair evenly between the damaged areas and the less damaged areas of the hair.

[0008] Therefore, the present invention has been made in consideration of the above problems, and aims to provide a hair deformation treatment agent that can obtain a good hair deformation effect while suppressing damage to the hair during the hair deformation treatment, and can uniformly deform the hair in damaged parts and less damaged parts of the hair. [Means for solving the problem]

[0009] In order to achieve the above object, the hair transformation treatment of the present invention is characterized in that it contains a reducing agent and isopropanol, the isopropanol content is 1 to 40 mass %, and the alkalinity defined by the consumption of 0.1 N hydrochloric acid standard solution is 0.4 to 3.0 mL / g. Effect of the Invention

[0010] According to the present invention, it is possible to obtain a good hair deformation effect while suppressing damage to the hair during the hair deformation process, and it is possible to uniformly deform the hair in damaged and less damaged parts of the hair. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Preferred embodiments of the present invention will be described below. Note that the present invention is not limited to the following embodiments, and can be modified as appropriate within the scope of the present invention.

[0012] The hair transformation treatment agent of the present invention is used as a first agent containing a reducing agent in hair transformation treatment. Here, "hair transformation treatment" refers to treatment involving reduction of cystine bonds in hair, such as permanent wave treatment and straight perm treatment.

[0013] (reducing agent) The hair transformation treatment of the present invention contains a reducing agent as a main component. This reducing agent is for breaking disulfide bonds in the keratin protein of hair, thereby transforming the hair.

[0014] The reducing agent is not particularly limited, and may be any reducing agent that is normally used in hair transformation treatments. Examples of the thioglycolic acid include thioglycolic acid, sodium thioglycolate, ammonium thioglycolate, diammonium dithioglycolate, and esters of thioglycolic acid and glycerin; cysteines such as L-cysteine, DL-cysteine, cysteine ​​salts (L-cysteine ​​hydrochloride, DL-cysteine ​​hydrochloride, etc.), acetylcysteine ​​(N-acetyl-L-cysteine, etc.), cysteine ​​alkyl esters (L-cysteine ​​methyl ester, L-cysteine ​​ethyl ester, etc.), and amidinocysteine; mercaptopropionic acid or a salt thereof, cysteamine or a salt thereof, thiolactic acid or a salt thereof, thiomalic acid or a salt thereof, butyrolactone thiol, ascorbic acid or a salt thereof, erythorbic acid or a salt thereof, sulfurous acid, sulfites (ammonium sulfite, potassium sulfite, sodium sulfite, etc.), hydrogen sulfites (sodium hydrogen sulfite, ammonium hydrogen sulfite, etc.), and thiosulfuric acid or a salt thereof. These may be used alone or in combination of two or more.

[0015] Furthermore, the above-mentioned "salts thereof" include, for example, hydrochloride, ammonium salt, sodium salt, and the like.

[0016] Among these reducing agents, it is preferable to use thioglycolic acids because they have an excellent hair transformation effect. These reducing agents can be used alone or in combination of two or more kinds.

[0017] In the present invention, the amount of the reducing agent relative to the total amount of the hair transformation treatment agent (i.e., 100% by mass of the hair transformation treatment agent) is not particularly limited, and can be, for example, 1 to 20% by mass, and preferably 3 to 8% by mass.

[0018] (solvent) The solvent (dispersion medium) used in the hair transformation treatment of the present invention includes water (e.g., ion-exchanged water) and isopropanol.

[0019] The hair transformation treatment agent of the present invention is characterized in that the content of isopropanol in the entire hair transformation treatment agent is 1 to 40 mass %.

[0020] This is because if the content of isopropanol is less than 1% by mass, the penetration power of the reducing agent into the hair is reduced, and it is not possible to obtain a good hair transformation effect, particularly in the less damaged part near the root of the hair, and it is not possible to uniformly deform the hair. On the other hand, if the content of isopropanol is more than 40% by mass, the penetration power of the reducing agent into the hair becomes excessive, and it is not possible to obtain a good hair transformation effect, particularly in the damaged part at the tip of the hair, and it is not possible to uniformly deform the hair.

[0021] That is, in the hair transformation treatment agent of the present invention, by using a reducing agent and isopropanol in combination and setting the content of isopropanol in the entire hair transformation treatment agent to 1 to 40 mass%, the penetration power of the reducing agent into the hair can be improved, making it possible to obtain a good hair transformation effect and to uniformly deform the hair in the damaged areas often seen at the tips and in the less damaged areas near the roots of the hair.

[0022] From the viewpoint of further improving the penetration power of the reducing agent into the hair, thereby obtaining an excellent hair transformation effect, and deforming the hair more uniformly, it is preferable that the content of isopropanol in the entire hair transformation treatment agent is 5 to 15 mass%.

[0023] Furthermore, if the content of isopropanol in the entire hair transformation treatment agent is more than 40 mass %, this is not preferred because it may damage the hair during the hair transformation treatment.

[0024] (Alkaline agent) The hair transformation treatment agent of the present invention may also contain an alkaline agent. The alkaline agent is not particularly limited, and for example, monoethanolamine, ammonia, guanidine carbonate, sodium hydroxide, and potassium hydroxide are used. These may be used alone or in combination of two or more kinds.

[0025] In the hair transformation treatment agent of the present invention, the alkalinity, defined by the consumption amount of 0.1 N hydrochloric acid standard solution, is adjusted to 0.4 to 3.0 mL / g by using the above-mentioned alkaline agent.

[0026] Note that the "alkalinity determined by the amount of 0.1 N hydrochloric acid standard solution consumed" referred to here is the amount of 0.1 N hydrochloric acid standard solution required to reach a pH of 5.5 in 1 g or 1 mL of sample.

[0027] Therefore, in the hair transformation treatment agent of the present invention, there is no need to make the hair highly alkaline in order to improve the penetration power of the reducing agent into the hair, and the hair is in a low alkaline state (i.e., the alkalinity defined by the consumption of 0.1 N hydrochloric acid standard solution is a low value of 0.4 to 3.0 mL / g), so that the above-mentioned good hair transformation effect can be obtained while suppressing damage to the hair during the hair transformation treatment, and it becomes possible to uniformly deform the hair in damaged and less damaged areas.

[0028] (pH adjuster) The hair transformation treatment agent of the present invention may also contain a pH adjuster. The pH adjuster is not particularly limited, and may be any that is generally used in hair cosmetics. Examples of the pH adjuster include tartaric acid, sodium dihydrogen phosphate, trisodium phosphate, sesquicarbonate, arginine, sodium bicarbonate, sodium carbonate, 2-amino-2-methyl-1-propanol, tripotassium citrate, trisodium citrate, and diammonium hydrogen phosphate.

[0029] (pH) The hair transformation treatment agent of the present invention has a pH adjusted to 7 to 8.5 by using the above-mentioned pH adjuster.

[0030] This is because if the pH is less than 7, the penetration into the hair will decrease and sufficient hair deforming force may not be obtained, whereas if the pH is more than 8.5, the hair will be in a highly alkaline state, which may cause significant damage to the hair during the hair deforming treatment.

[0031] (chelating agent) The hair transformation treatment agent of the present invention may also contain a chelating agent from the viewpoint of improving the stability of the agent.

[0032] The chelating agent is at least one selected from the group consisting of ethylenediaminetetraacetic acid (EDTA), hydroxyethylethylenediaminetriacetic acid (HEDTA), dihydroxyethylethylenediaminediacetic acid (DHEDDA), diethylenetriaminepentaacetic acid (DTPA), and salts thereof. Examples of the salts include disodium ethylenediaminetetraacetic acid (EDTA·2Na), trisodium hydroxyethylethylenediaminetriacetic acid (HEDTA·3Na), disodium dihydroxyethylethylenediaminediacetic acid (DHEDDA·2Na), and pentasodium diethylenetriaminepentaacetic acid (DTPA·5Na). These may be used alone or in combination of two or more.

[0033] The content of the chelating agent in the entire hair transformation treatment of the present invention is preferably 0.05% by mass or more and 1.0% by mass or less, based on 100% by mass of the hair transformation treatment.

[0034] (Other Ingredients) The hair transformation treatment agent of the present invention may contain, within a range that does not impair the effects of the present invention, oily components (e.g., sphingolipids, ceramides, cholesterol derivatives, phytosterol derivatives, phospholipids, lanolin, lanolin fatty acid derivatives, perfluoropolyether, etc.), vegetable oils (e.g., olive oil, shea butter, macadamia nut oil, etc.), waxes (e.g., jojoba seed oil, carnauba wax, candelilla wax, beeswax, etc.), hydrocarbons (e.g., liquid paraffin, light liquid isoparaffin, paraffin, microcrystalline wax, squalane, petrolatum, isododecane, isohexadecane, etc.), higher fatty acids (e.g., myristic acid, oleic acid, stearic acid, isostearic acid, branched fatty acids (C(number of carbons)14-28), hydroxystearic acid, etc.), alcohols (e.g., cetanol, isostearyl alcohol, oleyl alcohol, hydrogenated rapeseed oil alcohol, cholesterol, sitosterol, 1,3-butylene glycol, propylene glycol, dipropylene glycol, glycerin, diglycerin, 1,2-hexanediol, etc.), sugars and their derivatives (e.g., glucose, sucrose, D-sorbitol, maltose, etc.), tose, trehalose, polyoxypropylene methyl glucoside, glyceryl glucoside, etc.), esters (e.g., isopropyl myristate, cetyl palmitate, octyldodecyl oleate, glyceryl triisostearate, diethoxyethyl succinate, cetyl lactate, octyldodecyl lanolin fatty acid, etc.), silicones (e.g., dimethyl silicone, methylphenyl silicone, cyclic dimethyl silicone, polyether modified silicone, alkyl modified silicone, amino modified silicone, dimethiconol, PCA dimethicone, etc.), amino acids, and its derivatives (e.g., glutamic acid, aspartic acid, glycine, serine, methionine, trimethylglycine, sodium polyaspartate, N-lauroyl-L-lysine, etc.), PPT and proteins (e.g., hydrolyzed silk, hydrolyzed wheat, hydrolyzed soybean, hydrolyzed collagen, hydrolyzed keratin, silylated hydrolyzed silk, silylated hydrolyzed wheat, cationized hydrolyzed silk, cationized hydrolyzed collagen, keratin, etc.), natural polymers (e.g., alginate, mannan, gum arabic, tamarind gum, chitosan, carrageenan,Mucin, shellac, hyaluronate, cationized hyaluronic acid, xanthan gum, dextrin, hydroxyethyl cellulose, cationized cellulose, guar gum, cationized guar gum, honey, etc.), synthetic polymers (e.g., anionic polymers, cationic polymers, nonionic polymers, amphoteric polymers, polyethylene glycol, polypropylene glycol, polyoxypropylene diglyceryl ether, polyquaternium-22, polyquaternium-39, etc.), anionic surfactants (e.g., alkyl ether carboxylates, N-acyl glutamine, etc.), phosphate, N-acylmethyltaurine salts, alkyl sulfosuccinates, alkyl ether sulfates, polyoxyethylene alkyl ether phosphate, dicetyl phosphate, etc.), other cationic surfactants (e.g., alkylamine salts, fatty acid amidoamine salts, etc.), amphoteric surfactants (e.g., glycine-type amphoteric surfactants, aminopropionic acid-type amphoteric surfactants, aminoacetate betaine-type amphoteric surfactants, sulfobetaine-type amphoteric surfactants, etc.), nonionic surfactants (e.g., polyoxyethylene alkyl ethers, polyoxyethylene sorbitan fatty acid esters, poly Oxyethylene hydrogenated castor oil, alkyl glucoside, new oil type glyceryl monostearate, etc.), dyes (e.g., tar dyes, natural dyes, etc.), plant extracts (e.g., chamomile extract, comfrey extract, sage extract, rosemary extract, persimmon tannin, tea distillate, copper chlorophyllin sodium, etc.), vitamins (e.g., L-ascorbic acid, DL-α-tocopherol, D-panthenol, natural vitamin E, etc.), ultraviolet absorbers (e.g., para-aminobenzoic acid, octyl salicylate, 2-ethylhexyl para-methoxycinnamate, ferulic acid, etc.) , preservatives other than those mentioned above (e.g., benzoic acid, sodium benzoate, salicylic acid, dehydroacetic acid, sodium dehydroacetate, parabens, phenoxyethanol, etc.), antioxidants (e.g., sodium hydrogen sulfite, dibutylhydroxytoluene, etc.), sequestering agents, other inorganic compounds (e.g., titanium oxide, silver, platinum, iron chloride, iron oxide, sodium bromate, hydrogen peroxide, etc.), other organic compounds (e.g., urea, hydroxyethyl urea, sodium dl-pyrrolidone carboxylate, copper gluconate, etc.), solvents (e.g., benzyl alcohol, etc.), propellants (e.g.,It is possible to blend various known cosmetic ingredients such as LPG (liquefied petroleum gas), DME (dimethyl ether), nitrogen gas, carbon dioxide gas, etc., and fragrances.

[0035] The hair transformation treatment agent of the present invention can be made into a formulation such as a liquid, milk, cream, foam (form when in use), mist (form when in use), etc. by known methods, and can also be made into an aerosol form.

[0036] For example, in the case of a cream-like hair transformation treatment agent, an emulsifier may be contained in addition to the various components mentioned above.

[0037] Examples of the emulsifier include cetostearyl alcohol, cationic surfactants (behenyltrimethylammonium chloride (behentrimonium chloride)), nonionic surfactants (such as laureth-25), and anionic surfactants (such as polyoxyethylene cetyl ether phosphate). These may be used alone or in combination of two or more.

[0038] Furthermore, by using an emulsifier, it is possible to prevent an increase in viscosity over time, and therefore it is possible to improve the ejection properties of the cream-like hair transformation treatment agent.

[0039] The content of the emulsifier in the entire hair transformation treatment of the present invention is preferably 0.1% by mass or more and 10.0% by mass or less, based on 100% by mass of the hair transformation treatment.

[0040] Furthermore, in the case of a hair transformation treatment agent in an aerosol form, a foaming agent may be contained in addition to the various components described above.

[0041] Examples of the foaming agent include PEG12-dimethicone, polyoxyethylene alkyl ether, polyoxyethylene hydrogenated castor oil ether, etc. These may be used alone or in combination of two or more kinds.

[0042] The content of the foaming agent in the entire hair transformation treatment of the present invention is preferably 1.0% by mass or more and 10.0% by mass or less, based on 100% by mass of the hair transformation treatment. EXAMPLES

[0043] The present invention will be described below based on examples. Note that the present invention is not limited to these examples, and these examples can be modified or changed based on the spirit of the present invention, and they are not excluded from the scope of the present invention.

[0044] (Examples 1 to 13 and Comparative Examples 1 to 4) <Production of hair transformation treatment agent> Water (ion-exchanged water) and the various raw materials were mixed to produce hair transformation treatment agents of Examples 1 to 13 and Comparative Examples 1 to 4 having the compositions (mass %) shown in Tables 1 to 5.

[0045] As liquid hair transformation treatment agents, hair transformation treatment agents of Examples 1 to 11 and Comparative Examples 1 to 4 were produced.

[0046] Furthermore, a cream-type hair transformation treatment agent, Example 12, was produced.

[0047] In addition, the hair deformation treatment agent of Example 13 was manufactured as a hair deformation treatment agent in aerosol form, and the hair deformation treatment agent of Example 13 (95% by mass) and the propellant LPG (0.45 MPa, 5% by mass) were filled into a pressure-resistant container and mixed to produce a hair deformation treatment agent in aerosol form.

[0048] In addition, in each of the hair transformation treatment agents of Examples 1 to 13 and Comparative Examples 1 to 4, monoethanolamine was used to adjust the alkalinity [mL / g], defined by the consumption amount of the above-mentioned 0.1 N hydrochloric acid standard solution, and tartaric acid was used to adjust the pH. The adjusted alkalinity and pH values ​​in each of the hair transformation treatment agents of Examples 1 to 13 and Comparative Examples 1 to 4 are shown in Tables 1 to 5.

[0049] [Table 1]

[0050] [Table 2]

[0051] [Table 3]

[0052] [Table 4]

[0053] [Table 5]

[0054] <Production of the second agent containing an oxidizing agent> Water (ion-exchanged water) and the respective raw materials were mixed to produce a second part having the composition (mass %) shown in Table 6.

[0055] [Table 6]

[0056] <Preparing hair samples> A 30 cm long straight hair bundle (1 g for permanent wave treatment, 5 g for straight treatment) was used, and dyed twice using a commercially available hair color as a chemical treatment, and then permanently waving was performed using a commercially available perm solution. The treated hair was then immersed overnight in an aqueous solution of sodium polyoxyethylene lauryl sulfate (5% by mass) kept at 50°C, and thoroughly washed with water to obtain a sample hair.

[0057] <Permanent wave treatment> Next, the following treatments (A) to (J) were performed on the prepared hair. (A) First, the prepared hair bundle was wetted with water. (B) The hair was then wrapped around a rod. (C) Next, any one of the hair transformation treatment agents of Examples 1 to 11 and 13 and Comparative Examples 1 to 4 was applied, and a reduction treatment was carried out. (D) Next, the reduction-treated hair was placed in a container, sealed, and left at room temperature for 20 minutes. (E) Next, the hair was left at room temperature and then washed with water. (F) Next, a second agent containing an oxidizing agent was applied to the washed hair, and an oxidation treatment was carried out. (G) Next, the hair that had been oxidized with the second agent was left at room temperature for 5 minutes. (H) Next, the hair after being left at room temperature was subjected again to the above treatments (F) to (G). (I) The rods around the hair were then removed. (J) Then, the rods were removed and the hair was rinsed with water.

[0058] <Straight perm treatment> The prepared hair was subjected to the following treatments (a) to (g). (a) First, the prepared hair bundle was wetted with water. (b) Next, the hair transformation treatment agent of Example 12 was applied to the hair, and a reduction treatment was carried out. (c) Next, the reduction-treated hair was left at room temperature for 10 minutes. (d) Next, the hair was left at room temperature and then washed with water. (e) Next, the washed hair was dried with a hair dryer. (f) Next, the hair was treated with a hair straightening iron set at 180°C. (g) Next, a second agent containing an oxidizing agent was applied, and after an oxidation treatment, the resultant was left at room temperature for 5 minutes. (h) Next, the hair was washed with water. (i) Then, the washed hair was dried with a hair dryer.

[0059] <Evaluation criteria> Next, a sensory evaluation was conducted on hair that had been treated with the above (A) to (J) (permanent wave treatment) to determine the effect of the hair transformation agent used in the above (C) treatment on the finish feel of the permanent wave treatment. Specifically, 10 expert panelists evaluated the hair in three areas: (1) strength of hair transformation force, (2) uniformity of hair transformation, and (3) damage to hair. The evaluation criteria for each evaluation item are shown below.

[0060] (1) Strength of hair deformation Immediately after the final rinse of the permanent wave treatment, while the hair was still wet, the strength of the curl shape was compared and evaluated according to the following evaluation criteria.

[0061] Extremely high wave efficiency and very firm curl formation:◎ High wave efficiency and firm curl formation: ○ The wave efficiency is low and the curls are formed gently: △ The wave efficiency is very low and the curls are formed very loosely.

[0062] (2) Uniform deformability of hair Hair bundles were prepared by subjecting the middle to tip portion of the hair bundle to damage treatment, with less damage from the root to the middle portion and damage from the middle to the tip portion, and were evaluated according to the following evaluation criteria.

[0063] The curls are evenly formed from the tip of the hair to the root of the hair: Yes Curls are formed fairly evenly from the tip of the hair to near the root: △ The curls are uneven from the tip to the root of the hair: ×

[0064] (3) Damage to hair Immediately after the final rinse after the permanent wave treatment, the hair was wet and the texture (stiffness) was compared with that of untreated hair that had not been subjected to the permanent wave treatment, and evaluated according to the following evaluation criteria.

[0065] Compared to untreated hair, it is not stiff and has not progressed to damage: ◎ Compared to untreated hair, it is less stiff and the damage is almost not advanced: 〇 Compared to untreated hair, it is slightly stiff and slightly damaged: △ Compared to untreated hair, it is stiff and damaged: ×

[0066] In addition, a sensory evaluation was conducted on the hair that had been treated with the above (a) to (i) (straight perm treatment) to determine the effect of the hair deformation treatment agent used in the above (b) on the finish of the straight perm treatment. Specifically, the evaluation was conducted by 10 expert panelists on three items: (4) strength of hair deformation force, (5) uniformity of hair deformation, and (6) damage to hair. The evaluation criteria for each evaluation item are shown below.

[0067] (4) Strength of hair deformation Immediately after the final water rinse of the hair treatment, the hair bundle was dried and then unraveled to determine the strength of the straight shape (freedom of curls) compared with the state before the hair treatment and evaluated according to the following evaluation criteria.

[0068] Almost no peculiar taste: ◎ Some quirks remain: ○ The habit remains: △ The curl is still there: ×

[0069] (5) Uniform deformability of hair Hair bundles were prepared by subjecting the middle to tip portion of the hair bundle to damage treatment, with less damage from the root to the middle portion and damage from the middle to the tip portion, and were evaluated according to the following evaluation criteria.

[0070] The curl is evenly smoothed from the tip to the root of the hair: Yes The curl is somewhat evenly smoothed from the tip to the root of the hair: △ The curl is unevenly reduced from the tip to the root of the hair: ×

[0071] (6) Damage to hair Immediately after the final rinse after the straight perm treatment, the hair was wet and the texture (stiffness) was compared with that of untreated hair that had not been subjected to the straight perm treatment, and evaluated according to the following evaluation criteria.

[0072] Compared to untreated hair, it is not stiff and has not progressed to damage: ◎ Compared to untreated hair, it is less stiff and the damage is almost not advanced: 〇 Compared to untreated hair, it is slightly stiff and slightly damaged: △ Compared to untreated hair, it is stiff and damaged: ×

[0073] In each of the evaluations (1) to (6) above, "◎" was evaluated as being particularly excellent, "○" was evaluated as being excellent, and "△" and "×" were evaluated as being insufficient. The results are shown in Tables 1 to 5.

[0074] As shown in Tables 1 to 5, in Examples 1 to 13, which used hair transformation treatment agents containing a reducing agent and isopropanol, with an isopropanol content of 1 to 40% by mass and an alkalinity, defined by the consumption of a 0.1 N hydrochloric acid standard solution, of 0.4 to 3.0 mL / g, it is clear that a good hair transformation effect can be obtained while suppressing damage to the hair, and the hair can be transformed uniformly in damaged and less damaged areas of the hair.

[0075] On the other hand, in Comparative Example 1, since isopropanol is not contained, the hair deformation effect is insufficient and the entire hair cannot be uniformly deformed.

[0076] Moreover, in Comparative Example 2, since the content of isopropanol is more than 40% by mass, it is found that the hair cannot be uniformly deformed as a whole, and damage to the hair cannot be suppressed.

[0077] Moreover, in Comparative Examples 3 and 4, since the alkalinity is greater than 3.0 mL / g, it is found that the hair cannot be uniformly deformed as a whole, and damage to the hair cannot be suppressed. [Industrial Applicability]

[0078] As explained above, the hair transformation treatment agent of the present invention is particularly useful as a first agent in hair transformation treatments such as permanent wave treatment and straight perm treatment.

Claims

1. containing a reducing agent and isopropanol, The content of the isopropanol is 1 to 40% by mass, A hair transformation treatment agent characterized in that the alkalinity, as determined by the consumption of a 0.1N hydrochloric acid standard solution, is 0.4 to 3.0 mL / g.

2. 2. The hair transformation treatment according to claim 1, wherein the content of isopropanol is 5 to 15% by mass.

3. 3. The hair transformation treatment agent according to claim 1, wherein the pH is 7.0 to 8.

5.

4. 4. The hair transformation treatment according to claim 3, further comprising at least one selected from the group consisting of tartaric acid, ammonia, monoethanolamine, guanidine carbonate, sodium hydroxide, and potassium hydroxide.

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