JP6956487B2 - Hair deformation pretreatment agent and hair deformation treatment method - Google Patents

Description

The present invention is a pretreatment agent for hair deformation used by applying it to hair before the hair deformation treatment for deforming the hair shape with a reducing agent such as thioglycolic acid, and a hair deformation treatment method using the pretreatment agent. Regarding.

In the hair deformation treatment that makes the hair shape closer to a wavy or straight line, the first agent for hair deformation containing a reducing agent is used, and the cutting of the cystine bond in the hair by the reducing agent makes it possible to deform the hair shape. do. Prior to such hair deformation treatment, a pretreatment agent may be applied. The purpose of the application is to suppress the reaction of the reducing agent on the hair, to suppress further damage to the hair, and to improve the uniformity of the hair shape. Generally, the tip of the hair is easily penetrated by the first agent for hair deformation because of its large size.

Patent Document 1 contains 0.005 to 1.0% by weight of at least one selected from the group consisting of inorganic acids and salts thereof as an example of a pretreatment agent for hair deformation, and has a pH of 1.0 to 7.0. The pretreatment agent is disclosed (claim 1). It is described in Patent Document 1 that the pretreatment agent can suppress hair damage caused by the alkaline first agent for hair deformation (see paragraphs 0003 and 0007).

Japanese Unexamined Patent Publication No. 2002-145473

By the way, when an acidic pretreatment agent for hair deformation is used, when the pretreatment agent and the first agent are mixed in the hair, the pH of the first agent for hair deformation is higher than the pH of the first agent for hair deformation, which is generally alkaline. (Hereinafter, the pH may be referred to as "mixed pH") tends to decrease. As a result, the reaction of the reducing agent contained in the first agent can be suppressed, but since the alkalinity and pH of the known first agent are various, the pretreatment agent is highly adapted to the various alkalinity and the like. Sex is desired. In addition to this adaptability, a technique for increasing the viscosity of the pretreatment agent for hair deformation is desired in order to make it easy to adjust the ratio with the first agent for hair deformation mixed in the hair.

In view of the above circumstances, the present invention uses a highly viscous pretreatment agent for hair deformation and the pretreatment agent, in addition to having high adaptability to various alkalinity and pH of the first agent for hair deformation. An object of the present invention is to provide a method for treating hair deformation.

As a result of diligent studies by the present inventors, various first agents for hair deformation can be obtained by increasing the amount of salt in the acidic pretreatment agent for hair deformation containing a cationic surfactant and a higher alcohol. It has become possible to adapt to alkalinity and the like, and it has been found that the low viscosity generated by increasing the blending amount can be improved by blending a predetermined polyoxyethylene hydrogenated castor oil, and the present invention has been completed.

That is, the pretreatment agent for hair deformation according to the present invention is a mixture of a cationic surfactant, a higher alcohol, an acid, a nonionic surfactant, and a salt of an acid and an alkali, and the nonionic surfactant. As an agent, polyoxyethylene hydrogenated castor oil having an average number of moles of ethylene oxide added of 50 or more is blended, and the blending amount of the salt of the acid and alkali is 1.0% by mass or more, which is characteristic of being acidic. And.

The dosage form of the pretreatment agent for hair deformation according to the present invention is preferably creamy. The viscosity of the pretreatment agent for hair deformation of the present invention is preferably 6000 mPa · s or more and 30,000 mPa · s or less. With this creamy dosage form or viscosity, it is easy to apply it to hair, and it is easy to adjust the mixing ratio with the first agent for hair deformation.

In the pretreatment agent for hair deformation according to the present invention, the blending amount of the salt of the acid and the alkali may be 2.0% by mass or more. Although there is a decrease in viscosity with this blending amount setting, the viscosity can be improved by blending a predetermined polyoxyethylene hydrogenated castor oil.

In the pretreatment agent for hair deformation according to the present invention, the blending amount of the acid is, for example, 0.5% by mass or more, preferably 1.0% by mass or more. When the amount of the acid blended is 0.5% by mass or more, a buffering action suitable for suppressing hair damage is generated. In addition, the viscosity of the acid is also reduced by the addition of the predetermined polyoxyethylene cured castor oil, although the degree of viscosity is smaller than that of the salt of the acid and the alkali. The decline can be improved.

The pH of the pretreatment agent for hair deformation according to the present invention is preferably 6.0 or less. Within this pH range, even when a first agent for hair deformation having a high alkalinity or pH is used, it is suitable for suppressing the reduction reaction by the first agent.

The pretreatment agent for hair deformation according to the present invention preferably contains malic acid or phosphoric acid as the acid. The combination of malic acid or phosphoric acid enhances the thermal stability of the pretreatment agent.

The pretreatment agent for hair deformation according to the present invention may contain polyoxyethylene oleyl ether having an average addition mole number of ethylene oxide of 5 or less. By blending this polyoxyethylene oleyl ether, the pretreatment agent can be easily left on the hair surface, and the mixing ratio with the first agent for hair deformation to be applied later can be easily adjusted.

The pretreatment agent for hair deformation according to the present invention is preferably used by applying it to the hair before applying the first agent for straightening creamy curly hair. When the first agent for straightening creamy hair is applied to hair, the pretreatment agent for hair deformation according to the present invention, which is easy to adjust the mixing ratio with the first agent that easily stays on the hair, is suitable.

The hair deformation treatment method according to the present invention includes a pretreatment step of applying the hair deformation pretreatment agent according to the present invention to the hair, and a reduction method of applying an alkaline first agent for hair deformation containing a reducing agent to the hair. It is characterized by having a process.

According to the cationic surfactant, higher alcohol, acid, nonionic surfactant according to the present invention, and the acidic pretreatment agent for hair deformation containing a salt of acid and alkali, the salt of acid and alkali By setting the blending amount to 1.0% by mass or more, it becomes possible to adapt to various alkalinities of the first agent for hair deformation. Further, according to the pretreatment agent for hair deformation according to the present invention, since a predetermined polyoxyethylene hydrogenated castor oil is blended, the reduced viscosity is improved by blending the salt in an amount of 1.0% by mass or more. can.

Further, according to the hair deformation treatment method according to the present invention, the first agent for hair deformation according to the present invention is applied to the hair before the first agent for hair deformation is applied to the hair. The mixing ratio of the agent and the first agent for hair deformation can be easily adjusted, and the reaction by the reducing agent contained in the first agent can be easily suppressed.

The present invention will be described below based on embodiments of the present invention.
(Pretreatment agent for hair deformation)
The hair deformation pretreatment agent of the present embodiment (hereinafter, "hair deformation pretreatment agent" may be referred to as "pretreatment agent") is a cationic surfactant, a higher alcohol, an acid, or a nonionic surfactant. , A salt of an acid and an alkali, and water (the amount of water blended is, for example, 60% by mass or more and 85% by mass or less). Further, the pretreatment agent of the present embodiment may contain a raw material contained in a known pretreatment agent as an optional raw material.

The pretreatment agent of the present embodiment may contain one or more selected from known cationic surfactants. Examples of the cationic surfactant include dilong-chain alkyldimethylammonium salts such as distearyldimethylammonium chloride, disetyldimethylammonium chloride, and dicocoyldimethylammonium chloride; behenyltrimethylammonium chloride, behenyltrimethylammonium metosulfate, and stearyl chloride. Examples thereof include mono-long-chain alkyltrimethylammonium salts such as trimethylammonium, stearyltrimethylammonium bromide and cetyltrimethylammonium bromide; and long-chain alkoxyalkyltrimethylammonium salts such as stearoxypropyltrimethylammonium chloride. The blending amount of the cationic surfactant in the pretreatment agent of the present embodiment is, for example, 0.5% by mass or more and 4% by mass or less.

The pretreatment agent of the present embodiment may contain one or more selected from known higher alcohols. The higher alcohol preferably has 14 or more and 22 or less carbon atoms, and is, for example, a linear saturated alcohol such as myristyl alcohol, cetyl alcohol, stearyl alcohol, araquil alcohol, and behenyl alcohol; and a linear non-alcohol such as oleyl alcohol. Saturated alcohols; branched saturated alcohols such as hexyldecanol, octyldodecanol, isosetyl alcohol, isostearyl alcohol; The blending amount of the higher alcohol in the pretreatment agent of the present embodiment is, for example, 3% by mass or more and 8% by mass or less.

The pretreatment agent of the present embodiment may contain one or more selected from known acids. The viscosity generated by the combination of the cationic surfactant and the higher alcohol tends to decrease by increasing the amount of the acid compounded. However, since the pretreatment agent of the present embodiment contains the predetermined polyoxyethylene hydrogenated castor oil described later, the decrease in viscosity can be improved.

The acid may be either an organic acid or an inorganic acid. Examples of the organic acid include malic acid, lactic acid, tartaric acid, citric acid, succinic acid and glycolic acid. Examples of the inorganic acid include phosphoric acid, sulfuric acid, and hydrochloric acid. When malic acid or phosphoric acid is selected as the acid, the dosage form of the pretreatment agent of the present embodiment is excellent in thermal stability.

The blending amount of the acid in the pretreatment agent of the present embodiment is an amount that can set the pretreatment agent to be acidic. The blending amount is preferably 0.5% by mass or more, preferably 1.0% by mass or more, and more preferably 2.0% by mass or more in order to generate a buffering action suitable for suppressing hair damage. On the other hand, the upper limit of the amount of the acid compounded is, for example, 4.0% by mass.

The pretreatment agent of the present embodiment contains one or more selected from known nonionic surfactants. Examples of the nonionic surfactant include polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene fatty acid ester, polyoxyethylene sorbitan fatty acid ester, and polyoxyethylene sorbitol tetra. Examples thereof include fatty acid esters, glycerin fatty acid esters, alkyl glucosides, sorbitan fatty acid esters, polyglycerin fatty acid esters, polyoxyethylene glycerin fatty acid esters, sucrose fatty acid esters, and alkyl alkanolamides. The blending amount of the nonionic surfactant in the pretreatment agent of the present embodiment is, for example, 0.1% by mass or more and 4.0% by mass or less.

A predetermined nonionic surfactant is blended as an essential component in the pretreatment agent of the present embodiment. The predetermined nonionic surfactant is one or more selected from polyoxyethylene hydrogenated castor oil having an average addition mole number of ethylene oxide of 50 or more. By blending the predetermined surfactant, the viscosity that is lowered by the blending of the salt of the acid and the alkali described later can be improved.

The polyoxyethylene hydrogenated castor oil having an average added mole number of ethylene oxide of 50 or more is preferably having an average added mole number of 50 or more and 150 or less, and a larger average added mole number is more suitable for improving viscosity. be. Examples of the polyoxyethylene cured castor oil include polyoxyethylene cured castor oil (50EO), polyoxyethylene cured castor oil (55EO), and polyoxyethylene cured castor oil (60EO). ), Polyoxyethylene cured castor oil (70EO), polyoxyethylene cured castor oil (80EO), polyoxyethylene cured castor oil (90EO), polyoxyethylene cured castor oil (100E) O.), polyoxyethylene hydrogenated castor oil (120EO), polyoxyethylene cured castor oil (150EO) (the integer attached immediately before the above "EO" is Represents the average number of moles of ethylene oxide added.). In the pretreatment agent of the present embodiment, the blending amount of the polyoxyethylene cured castor oil having an average number of moles of ethylene oxide added of 50 or more is preferably 0.1% by mass or more and 1.0% by mass or less, and is 0.2. It is preferably mass% or more and 0.5 mass% or less. When it is 0.1% by mass or more, it is preferable to improve the decrease in viscosity due to the addition of salt, and when it is 1.0% by mass or less, the handleability when the pretreatment agent is brushed onto the hair is excellent.

The pretreatment agent of the present embodiment may contain polyoxyethylene oleyl ether having an average number of moles of ethylene oxide added of 5 or less. By blending this polyoxyethylene oleyl ether, it becomes easy to leave the pretreatment agent that is usually brushed on the hair surface, and it is possible to easily adjust the mixing ratio with the first agent for hair deformation to be applied later.

Examples of the polyoxyethylene oleyl ether in which the average number of moles of ethylene oxide added is 5 or less include polyoxyethylene oleyl ether (2EO), polyoxyethylene oleyl ether (3EO), and polyoxyethylene oleyl. Examples include ether (4EO) and polyoxyethylene oleyl ether (5EO) (the integer attached immediately before the above "EO" represents the average number of moles of ethylene oxide added). In the pretreatment agent of the present embodiment, the blending amount of polyoxyethylene oleyl ether having an average addition mole number of ethylene oxide of 5 or less is preferably 0.2% by mass or more, preferably 0.5% by mass or more. On the other hand, the upper limit of the blending amount is, for example, 2.0% by mass.

The pretreatment agent of the present embodiment contains one or more selected from known salts of acids and alkalis. The buffering action of the combination of the above acids such as salt and phosphoric acid lowers the alkalinity and mixed pH when the pretreatment agent and the first agent are mixed, as compared with the first agent for hair deformation. Further, the addition of the above-mentioned salts and the like and the above-mentioned acids such as phosphoric acid lowers the viscosity of the pretreatment agent, but the addition of a predetermined polyoxyethylene hydrogenated castor oil can improve the viscosity.

The salt is an organic acid salt such as an alkali metal salt of an organic acid or an ammonium salt of an organic acid; an inorganic acid salt such as an alkali metal salt of an inorganic acid or an ammonium salt of an inorganic acid; and the like. Examples of the organic acid salt and the inorganic acid salt include sodium malate, sodium lactate, ammonium lactate, disodium tartrate, potassium tartrate, sodium citrate, monosodium citrate, potassium citrate, diammonium citrate, and sodium phosphate. , Disodium phosphate, Trisodium phosphate, Potassium phosphate, Dipotassium phosphate, Tripotassium phosphate, Ammonium phosphate, Diammonium phosphate, Sodium sulfate, Sodium hydrochloride, Potassium hydrochloride, Ammonium hydrochloride, Sodium carbonate, Carbonate Examples include sodium hydrogen hydrogen and ammonium hydrogen carbonate.

The blending amount of the salt in the pretreatment agent of the present embodiment is 1.0% by mass or more, preferably 2.0% by mass or more and 5.0% by mass or less, and 2.5% by mass or more and 4.5% by mass. The following is preferable, and more preferably 3.0% by mass or more and 4.0% by mass or less. When it is 1.0% by mass, a buffering action suitable for suppressing hair damage is generated. Further, when it is 5.0% by mass or less, the salt can be easily dissolved in the pretreatment agent.

The optional raw material to be blended in the pretreatment agent of the present embodiment is appropriately selected from the raw materials to be blended in the known pretreatment agent. The raw materials are polyhydric alcohols, sugars, ester oils, fats and oils, fatty acids, hydrocarbons, waxes, silicones, polymer compounds, amino acids, animal and plant extracts, microbial derivatives, inorganic compounds, fragrances, preservatives, and metal ion sequestering agents. And so on.

The dosage form when the pretreatment agent of the present embodiment is used is not particularly limited, and examples thereof include liquid, cream, gel, foam (foam), and mist. A creamy dosage form is preferable from the viewpoint of ease of application to the hair using a brush or the like and suppression of dripping from the hair. With this cream-like dosage form, when the dosage form of the first agent for hair deformation is cream-like or gel-like, it is easy to adjust the mixing ratio with the pretreatment agent.

The viscosity of the pretreatment agent of the present embodiment is preferably 6000 mPa · s or more and 30,000 mPa · s or less, preferably 8000 mPa · s or more and 20000 mPa · s or less, and more preferably 9000 mPa · s or more and 12000 mPa · s or less. When it is 6000 mPa · s or more, it is possible to suppress the run-off from the hair, and when it is 30,000 mPa · s or less, it is easy to apply it to the hair surface. For the viscosity, a value after 60 seconds measured at 25 ° C. using a rotor selected according to the viscosity with a B-type viscometer (B-type viscometer "VISCOMETER TV-20" manufactured by TOKIMEC, etc.) is adopted.

The pretreatment agent of the present embodiment is acidic, and the pH at 25 ° C. is preferably 2.5 or more and 6.0 or less, preferably 2.5 or more and 5.0 or less, and 2.5 or more and 4.0 or less. Is more preferable. When the pH is 2.5 or more, the influence on the skin can be reduced, and when the pH is 6.0 or less, the mixed pH can be easily adjusted to neutral or acidic.

(First agent for hair deformation)
The first agent for hair deformation of the present embodiment (hereinafter, "the first agent for hair deformation" may be referred to as "first agent") is an alkaline one in which a reducing agent and water are mixed (hereinafter, the first agent for hair deformation may be referred to as "first agent"). The blending amount of water is, for example, 60% by mass). Further, the first agent of the present embodiment may contain a raw material contained in a known first agent as an optional raw material.

The first agent of the present embodiment may contain one or more selected from the reducing agents contained in the known first agent. Examples of the reducing agent include known reducing agents having a thiol group, and examples thereof include thioglycolic acid, thioglycolate (ammonium thioglycolate, monoethanolamine thioglycolate, etc.), cysteamine, and cysteamine salt (cysteamine hydrochloride). Salt, etc.), Cysteine (L-Cysteine, DL-Cysteine, etc.), Cysteine Salt (L-Cysteine Hydrochloride, DL-Cysteine Hydrochloride, etc.), Acetylcysteine (N-Acetyl-L-Cysteine, etc.), Glyceryl Thiolglycolate , Thiolactic acid, thiolate, butyrolactone thiol. The blending amount of the reducing agent in the first agent of the present embodiment may be appropriately set, and is, for example, 2% by mass or more and 15% by mass or less.

The first agent of the present embodiment contains one or more alkaline agents for adjusting the pH to the alkaline side. Examples of this alkaline agent include ammonia and amino alcohols (monoethanolamine, triethanolamine, isopropanolamine, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol. , Etc.), basic amino acids (arginine, etc.), morpholine, carbonates (ammonium carbonate, ammonium hydrogencarbonate, sodium carbonate, sodium hydrogencarbonate, etc.), phosphates (ammonium monohydrogen phosphate, sodium monohydrogen phosphate, etc.), And caustic alkalis (potassium hydroxide, sodium hydroxide).

As described above, the first agent of the present embodiment is optionally blended with a material appropriately selected from known raw materials for the first agent. This optional raw material includes nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants, polymer compounds, silicones, hydrocarbons, waxes, higher alcohols, polyhydric alcohols, fatty acids, fats and oils, ester oils, Proteins, amino acids, anti-inflammatory agents, preservatives, chelating agents, fragrances, etc.

The dosage form of the first agent of the present embodiment is not particularly limited as described later, but it is preferably creamy by blending a higher alcohol and a cationic surfactant.

The higher alcohol preferably has 14 or more and 22 or less carbon atoms, and is, for example, a linear saturated alcohol such as myristyl alcohol, cetyl alcohol, stearyl alcohol, araquil alcohol, and behenyl alcohol; and a linear non-alcohol such as oleyl alcohol. Saturated alcohols; branched saturated alcohols such as hexyldecanol, octyldodecanol, isosetyl alcohol, isostearyl alcohol; It is preferable to blend one or more kinds of higher alcohols, and the blending amount of the higher alcohol in the first agent of the present embodiment is, for example, 3% by mass or more and 8% by mass or less.

Examples of the above-mentioned cationic surfactant include dilong-chain alkyldimethylammonium salts such as distearyldimethylammonium chloride, disetyldimethylammonium chloride, and dicocoyldimethylammonium chloride; behenyltrimethylammonium chloride, behenyltrimethylammonium metosulfate, and chloride. Examples thereof include mono-long-chain alkyltrimethylammonium salts such as stearyltrimethylammonium, stearyltrimethylammonium bromide, and cetyltrimethylammonium bromide; and long-chain alkoxyalkyltrimethylammonium salts such as stearoxypropyltrimethylammonium chloride. It is preferable to blend one or more kinds of cationic surfactants, and the blending amount of the cationic surfactant in the first agent of the present embodiment is, for example, 0.5% by mass or more and 4% by mass or less.

The dosage form when the first agent of the present embodiment is used is not particularly limited, and examples thereof include liquid, cream, and gel. In order to prevent the first agent applied to the hair from running off, a cream or gel is preferable.

The viscosity of the first agent of the present embodiment is not particularly limited. The viscosity is preferably 2000 mPa · s or more, preferably 4000 mPa · s or more, more preferably 8000 mPa · s or more, still more preferably 10,000 mPa · s or more, in order to suppress the run-off from the hair. Further, in order to enhance the permeability of the first agent into the hair, the viscosity thereof is preferably 30,000 mPa · s or less, preferably 25,000 mPa · s or less, and more preferably 20,000 mPa · s or less. For the viscosity, a value after 60 seconds measured at 25 ° C. using a rotor selected according to the viscosity with a B-type viscometer (B-type viscometer "VISCOMETER TV-20" manufactured by TOKIMEC, etc.) is adopted.

The pH of the first agent of the present embodiment is preferably 8.0 or more and 10.0 or less at 25 ° C.

The alkalinity of the first agent of the present embodiment is, for example, 2.5 or more and 6.5 or less. Here, "alkalinity" is the volume of 0.1 mol / L hydrochloric acid required to neutralize 1 g of the first agent (unit of alkalinity: ml). The alkalinity may be adjusted by blending the above alkaline agent.

(Second agent for hair deformation)
In the hair deformation treatment using the pretreatment agent and the first agent of the present embodiment, the second agent for hair deformation containing an oxidizing agent (hereinafter, the "second agent for hair deformation" is referred to as the "second agent". It is preferable to use). The second agent of the present embodiment is preferably a known second agent according to the hair deformation treatment.

The second agent of the present embodiment is a mixture of an oxidizing agent and water (a typical second agent of the present embodiment contains 75% by mass or more of water). .. Further, the second agent of the present embodiment may contain a raw material contained in a known second agent as an optional raw material.

The oxidizing agent to be blended in the second agent of the present embodiment is preferably bromate (sodium bromate, potassium bromate, etc.) or hydrogen peroxide, as in the known second agent.

As described above, the second agent of the present embodiment is optionally blended with a material appropriately selected from known raw materials for the second agent. This optional raw material includes nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants, polymer compounds, silicones, hydrocarbons, waxes, higher alcohols, polyhydric alcohols, fatty acids, fats and oils, ester oils, Proteins, amino acids, chelating agents, anti-inflammatory agents, preservatives, fragrances, etc.

The dosage form when the second agent of the present embodiment is used is not particularly limited, and examples thereof include liquid, cream, and foam (foam).

The pH of the second agent of the present embodiment is, for example, 5.0 or more and 7.5 or less at 25 ° C. when a bromate is blended. Further, the pH of the second agent of the present embodiment is, for example, 2.5 or more and 3.5 or less at 25 ° C. when hydrogen peroxide is blended.

(Hair deformation treatment method)
The hair deformation treatment method of the present embodiment includes a pretreatment step of applying the pretreatment agent of the present embodiment to the hair and a reduction step of applying the first agent to the hair to which the pretreatment agent has been applied. It has a processing process. In the hair deformation treatment step, as in the known perm treatment, a wave treatment for modifying the hair using a rod or the like or a straightening treatment for straightening the hair shape is performed. In these treatments, the first agent of the present embodiment or the first and second agents of the present embodiment may be used. Further, as the same treatment, for example, (a) a first agent is used and a cold type one-agent wave treatment without heating is used, and (b) a first agent and a second agent are used and heating is accompanied. No cold two-agent wave treatment, (c) warming two-agent wave treatment with first and second agents and heating below 60 ° C, (d) first and second agents Cold type two-agent hair straightening treatment using two agents without heating, (e) Heating type two-agent hair straightening treatment using the first and second agents with heating at 60 ° C or lower Hair straightening treatment, (f) two-agent hair straightening treatment using a first agent and a second agent and using a high-temperature curling iron device. In the treatment shown above, the hair shape is fixed by air oxidation without using the second agent, but if the second agent is used, the immobilization can be promoted.

The above "(f) Two-agent hair straightening treatment using the first agent and the second agent and using a high-temperature curling iron device (hereinafter, may be referred to as" hair straightening treatment (f) "). Will be described more specifically below. The hair straightening treatment (f) includes a pretreatment step, a reduction step after the pretreatment step, a heating step after the reduction step, and an oxidation step after the heating step.

In the pretreatment step in the hair straightening treatment (f), the pretreatment agent of the present embodiment is applied to the hair.

In the reduction step in the hair straightening treatment (f), the first agent of the present embodiment is applied to the hair to which the pretreatment agent has been applied. At this time, since the pretreatment agent is applied before the application of the first agent, the pretreatment agent having a buffering action lowers the mixed pH as compared with the first agent. The mixed pH is, for example, 5.0 or more and 7.0 or less, and this pH setting can be performed by appropriately adjusting the mixing ratio of the pretreatment agent and the first agent.

In the reduction step, the hair after applying the first agent is left at room temperature or 60 ° C. or lower. The longer the standing time at this time, the easier it is for the hair to soften, for example, 10 minutes or more and 30 minutes or less.

In the heating step in the hair straightening treatment (f), the first agent of the hair after being reduced in the reduction step is washed away, and then the heating element and the hair are brought into contact with each other. The contact uses a known curling iron to stretch the hair and bring its shape closer to a straight line. Examples of known curling irons include "ADST Premium DS" manufactured by Hakko Co., Ltd. and "VSI-1009 / PJ" manufactured by Koizumi Seiki Co., Ltd.

The curling iron includes a pair of opposing metal plate-like bodies as heating elements. Then, when using a curling iron, as is known, dried or almost dried hair is sandwiched between facing heating elements, and then the curling iron is moved and pinched while maintaining the state in which the hair is pinched. Sliding the hair.

The set temperature of the heating element of the hair iron is 70 ° C. or higher, preferably 80 ° C. or higher, preferably 100 ° C. or higher, more preferably 140 ° C. or higher, and 160 ° C. or higher in order to efficiently deform the shape of the hair. Is more preferable. On the other hand, the set temperature of the heating element is preferably 230 ° C. or lower, preferably 210 ° C. or lower, more preferably 200 ° C. or lower, still more preferably 190 ° C. or lower, in order to suppress damage to the hair.

In the oxidation step in the hair straightening treatment (f), the second agent of the present embodiment is applied to the hair and left to stand. The leaving time at this time is, for example, 3 minutes or more and 15 minutes or less. Hair after being left to stand should be washed and dried.

Hereinafter, the present invention will be described in detail based on Examples, but the present invention is not limitedly interpreted based on the description of this Example.

(Examples 1a to 1c, Comparative Examples 1a to 1f)
Stearyltrimethylammonium chloride, dicocoyldimethylammonium chloride, cetanol, sodium lactate, lactic acid, polyoxyethylene hydrogenated castor oil (100EO), polyoxyethylene hydrogenated castor oil (60EO), polyoxyethylene hydrogenated castor oil (40EO), polyoxyethylene hydrogenated castor oil (20EO), polyoxyethylene polyoxypropylene cetyl ether (20EO) (4PO), polyoxyethylene cetyl ether (30EO) ), Polyoxyethylene oleyl ether (2EO), glycerin stearate, polyoxyethylene cetyl ether (20EO), stearyl stearate, isopropanol, and diethylhexyl sebacate, as well as water. To produce the pretreatment agents of Examples 1a to 1c and Comparative Examples 1a to 1f having a pH of 2.5 to 3.5. The raw materials blended with water and the blending concentration (unit: mass%) thereof are as shown in Table 1 below.

The viscosities of the pretreatment agents of Examples 1a to 1c and Comparative Examples 1a to 1f were visually confirmed. Here, the viscosities of the pretreatment agents of the other Examples and Comparative Examples containing the additional nonionic surfactant were compared with reference to Comparative Example 1a. The viscosities of the pretreatment agents of Examples 1a to 1c were also visually confirmed. As a result, as shown in Table 1 below, polyoxyethylene hydrogenated castor oil (100EO) or polyoxyethylene hydrogenated castor oil (60E), which is a polyoxyethylene hydrogenated castor oil having an average addition molar number of 50 or more of ethylene oxide, is obtained. Examples 1a to 1c containing O.) had a viscosity higher than the standard.

(Examples 2a to 2b)
Stearyltrimethylammonium chloride, dicocoyldimethylammonium chloride, cetanol, sodium lactate, phosphoric acid, polyoxyethylene hydrogenated castor oil (100EO), polyoxyethylene oleyl ether (2EO), glycerin stearate, polyoxy Examples 2a to 2b in which a raw material selected from ethylene cetyl ether (20EO), stearyl stearate, isopropanol, and diethylhexyl sebacate, and water are blended and the pH is 2.5 to 3.5. Pretreatment agent was manufactured. The raw materials blended with water and the blending concentration (unit: mass%) thereof are as shown in Table 2 below.

With respect to the pretreatment agents of Examples 2a to 2b, the brush coating normally performed in the above-mentioned straightening treatment (f) was applied to the hair, and the ease of remaining on the hair surface was confirmed. Here, as a result of confirmation based on the pretreatment agent of Example 2a, as shown in Table 2 below, Example 2a containing polyoxyethylene oleyl ether having an average addition mole number of ethylene oxide of 5 or less is , Better than the standard.

(Reference Examples 1a to 1b, Reference Examples 2a to 2c)
Stearyltrimethylammonium chloride, dicocoyldimethylammonium chloride, behenyltrimethylammonium chloride, cetanol, octyldodecanol, behenyl alcohol, sodium lactate, sodium malate, phosphoric acid, lactic acid, malic acid, glycerin stearate, polyoxyethylene cetyl ether (20E) O.), polyoxyethylene cetyl ether (30EO), polyoxyethylene oleyl ether (2EO), stearyl stearate, isopropanol, diethylhexyl sebacate, and solves -60 tetraoleate. The raw materials and water were blended to produce pretreatment agents of Reference Examples 1a to 1b and 2a to 2c having a pH of 2.5 to 3.5. The raw materials blended with water and the blending concentration (unit: mass%) thereof are as shown in Tables 3 to 4 below.

The pretreatment agents of Reference Examples 1a to 1b were left in an atmosphere of 50 ° C., and their stability as agents was visually confirmed. As shown in Table 3 below, Reference Example 1a containing phosphoric acid showed no phase separation even after 1 month at 50 ° C. This result shows that in an acidic pretreatment agent containing a cationic surfactant, a higher alcohol, a nonionic surfactant, a salt and an acid, if phosphoric acid is added, the thermal stability is high.

The pretreatment agents of Reference Examples 2a to 2c were left in an atmosphere of 50 ° C., and their stability as agents was visually confirmed. As shown in Table 3 below, Reference Examples 2b and 2c containing malic acid showed no phase separation even after 1 month at 50 ° C. This result shows that in an acidic pretreatment agent containing a cationic surfactant, a higher alcohol, a nonionic surfactant, a salt and an acid, if malic acid is added, the thermal stability is high.

Claims (11)

A pretreatment agent for hair deformation containing a cationic surfactant, a higher alcohol, an acid, a nonionic surfactant, and a salt of an acid and an alkali.
Polyoxyethylene hydrogenated castor oil having an average number of moles of ethylene oxide added of 50 or more is blended as the nonionic surfactant.
The blending amount of the salt of the acid and the alkali is 1.0% by mass or more, and the amount is 1.0% by mass or more.
Are acidic, dosage form Ri creamy der,
A first agent for hair deformation alkaline reducing agent is blended, the treatment agent prior to a hair deformation, characterized in Rukoto are mixed on the hair. The pretreatment agent for hair deformation according to claim 1, wherein the blending amount of the salt of the acid and the alkali is 5.0% by mass or less. The pretreatment agent for hair deformation according to claim 1 or 2, wherein the viscosity is 6000 mPa · s or more and 30,000 mPa · s or less. The pretreatment agent for hair deformation according to any one of claims 1 to 3, wherein the blending amount of the salt of the acid and the alkali is 2.0% by mass or more. The pretreatment agent for hair deformation according to any one of claims 1 to 4, wherein the amount of the acid is 0.5% by mass or more. The pretreatment agent for hair deformation according to any one of claims 1 to 5, wherein the amount of the acid blended is 1.0% by mass or more. The pretreatment agent for hair deformation according to any one of claims 1 to 6, wherein the pH is 6.0 or less. The pretreatment agent for hair deformation according to any one of claims 1 to 7, wherein malic acid or phosphoric acid is blended as the acid. The pretreatment agent for hair deformation according to any one of claims 1 to 8, wherein a polyoxyethylene oleyl ether having an average number of moles of ethylene oxide added of 5 or less is blended as the nonionic surfactant. The first agent pretreatment agent for hair deformation according to any one of claims 1-9 Ru first agent der for creamy for straightening curly hair the hair deformation. A pretreatment step of applying the pretreatment agent for hair deformation according to any one of claims 1 to 10 to the hair, and a pretreatment step.
The hair pretreatment agents for the hair deformation has been applied, the first agent for hair deformation alkaline reducing agent is compounded coating cloth, a first agent for the hair deformation and the front for hair deformation treatment agent A hair deformation treatment method comprising a reduction step of mixing the hair on the hair.