JP2020169133A - Base for hair treatment, hair cosmetic and hair treatment method - Google Patents

Abstract

To provide a base for hair treatment which can be used to form a film on the surface of hair in which the film can easily obtain water resistance.SOLUTION: There is provided a base for hair treatment which contains a copolymer of an unsaturated monomer (M) including a tertiary cationic unsaturated monomer (A), an anionic unsaturated monomer (B) and a hydrophobic ethylenic unsaturated monomer (C). The amount of the tertiary cationic unsaturated monomer (A) is 3 pts.mass or more and 20 pts.mass or less based on 100 pts.mass of the unsaturated monomer (M). The amount of the anionic unsaturated monomer (B) is 1 pt.mass or more and 5 pts.mass or less based on 100 pts.mass of the unsaturated monomer (M). The amount of the ethylenic unsaturated monomer (C) is 35 pts.mass or more and 60 pts.mass or less based on 100 pts.mass of the unsaturated monomer (M).SELECTED DRAWING: None

Description

The present invention relates to a hair treatment base, a hair cosmetic, and a hair treatment method.

Conventionally, hair cosmetics for the purpose of improving hair quality have been known. For example, Patent Document 1 discloses a pre-hair rinse type hair treatment agent composition (hair cosmetic) containing an anionic polymer.

JP-A-63-154610

However, in the case of a hair cosmetic as in Patent Document 1, although the texture of the hair can be temporarily improved, it is difficult to maintain the texture of the hair because the anionic polymer is easily washed away by one washing of the hair. .. That is, even if a film made of an anionic polymer is temporarily formed on the surface of the hair, this film is easily dissolved and washed away during hair washing.

An object of the present invention is to provide a hair treatment base, a hair cosmetic, and a hair treatment method that can be used to form a film on the surface of hair and the film can easily obtain water resistance.

The base for hair treatment according to one aspect of the present invention is a tertiary cationic unsaturated monomer (A), an anionic unsaturated monomer (B), and a hydrophobic ethylenically unsaturated monomer. It is a copolymer of an unsaturated monomer (M) containing (C). The amount of the tertiary cationic unsaturated monomer (A) is 3 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the unsaturated monomer (M). The amount of the anionic unsaturated monomer (B) is 1 part by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the unsaturated monomer (M). The amount of the ethylenically unsaturated monomer (C) is 35 parts by mass or more and 60 parts by mass or less with respect to 100 parts by mass of the unsaturated monomer (M).

The hair cosmetic according to one aspect of the present invention contains the hair treatment base.

The hair treatment method according to one aspect of the present invention includes forming a film containing the hair treatment base on the surface of dyed hair.

According to the present invention, a film containing a hair treatment base can be formed on the surface of the hair, and the film can easily obtain water resistance.

Hereinafter, modes for carrying out the present invention will be described. In addition, the following "(meta) acrylic" means that one or both of "acry" and "methacry" are included.

<Base for hair treatment>
The base for hair treatment according to this embodiment is a copolymer of unsaturated monomer (M). The unsaturated monomer (M) includes a tertiary cationic unsaturated monomer (A), an anionic unsaturated monomer (B), and a hydrophobic ethylenically unsaturated monomer (C). including. Specifically, the copolymer is a product obtained by polymerizing an unsaturated monomer (M).

In such a hair treatment base, since the hair treatment base contains a functional group derived from the tertiary cationic unsaturated monomer (A), it is easy to obtain a film having adhesion to the hair. That is, the film can be prevented from falling off from the hair. Further, when the hair treatment base contains a functional group derived from the hydrophobic ethylenically unsaturated monomer (C), the film can obtain water resistance. In addition, since one molecule contains a functional group derived from a tertiary cationic unsaturated monomer (A) and an anionic unsaturated monomer (B), due to the electrostatic interaction thereof, The film can obtain even better water resistance. Moreover, when a film containing a hair treatment base is formed on the dyed hair, discoloration of the dyed hair can be less likely to occur due to this film.

The tertiary cationic unsaturated monomer (A) is a compound containing a cationic group and a polymerizable unsaturated group. An example of a cationic group is a tertiary amine group. The tertiary cationic unsaturated monomer (A) has, for example, a structure represented by the following formula (1).

In formula (1), R is H or CH ₃ , A is O or NH, k is an integer in the range 1-4, m is an integer in the range 1-4, and n. Is an integer in the range 1-4.

Examples of the tertiary cationic unsaturated monomer (A) include dimethylaminoethyl acrylate, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, dimethylaminopropylacrylamide, and dimethylaminopropylmethacrylamide. The tertiary cationic unsaturated monomer (A) contains, for example, at least one selected from the group consisting of the above compounds.

The amount of the tertiary cationic unsaturated monomer (A) is 3 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the unsaturated monomer (M). In this case, it is possible to obtain a film having excellent water resistance and hair wash resistance while enhancing the affinity and adhesion of the film to the hair and making flaking less likely to occur. When the amount of the tertiary cationic unsaturated monomer (A) is 3 parts by mass or more, the affinity and adhesion to the hair are improved, and good flaking resistance can be easily obtained. On the other hand, when the amount of the tertiary cationic unsaturated monomer (A) is 20 parts by mass or less, the hydrophobicity of the film tends to be high, and the water resistance and hair wash resistance are likely to be improved. The molecular weight of the tertiary cationic unsaturated monomer (A) is preferably 100 or more and 250 or less.

The anionic unsaturated monomer (B) is a compound containing an anionic group and a polymerizable unsaturated group. Therefore, when the film is formed on the surface of the hair, the molecules of the hair treatment base can be bonded to each other in a matrix by the electrostatic interaction between the anionic group and the cationic group. The anionic unsaturated monomer (B) is an unsaturated monocarboxylic acid such as (meth) acrylic acid, crotonic acid, and ω-carboxy-polycaprolactone monoacrylate; itaconic acid, maleic acid, fumaric acid, anhydrous. Unsaturated dicarboxylic acids such as maleic acid and citraconic acid; 2- (meth) acryloyloxyethyl tetrahydrophthalic acid, 2- (meth) acryloyloxyethyl hexahydrophthalic acid, vinyl sulfonic acid, (meth) allyl sulfonic acid, etc. Examples include aromatic vinyl group-containing sulfonic acids such as alkene sulfonic acid and α-methylstyrene sulfonic acid; and (meth) acryloyloxyalkyl phosphate monoesters such as (meth) acryloyloxyethyl phosphate. The anionic unsaturated monomer (B) contains, for example, at least one selected from the group consisting of the above compounds.

The amount of the anionic unsaturated monomer (B) is 1 part by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the unsaturated monomer (M). In this case, the hair treatment bases are strongly bonded to each other by the bonding between the anionic group and the cationic group, so that flaking is less likely to occur, and a film having excellent water resistance and hair washing resistance can be obtained. .. When the amount of the anionic unsaturated monomer (B) is 1 part by mass or more, the anionic group and the cationic group are likely to be bonded, and the water resistance and hair washing resistance are likely to be improved. On the other hand, when the amount of the anionic unsaturated monomer (B) is 5 parts by mass or less, the hydrophobicity of the film tends to be high, and the water resistance and hair wash resistance are likely to be improved. The molecular weight of the anionic unsaturated monomer (B) is preferably 50 or more and 500 or less.

The molar percentage of the tertiary cationic unsaturated monomer (A) with respect to the anionic unsaturated monomer (B) is preferably 50 mol% or more and 350 mol% or less. In this case, the molecules of the hair treatment base are strongly bonded to each other by the interaction between the anionic group and the cationic group without impairing the adhesion of the cationic group to the hair, resulting in water resistance and hair wash resistance. An excellent film can be obtained.

The ethylenically unsaturated monomer (C) is a hydrophobic compound and contains an ethylenically unsaturated group. As a result, hydrophobicity can be imparted to the hair treatment base, so that the water resistance and hair wash resistance of the film can be easily improved. The solubility of the ethylenically unsaturated monomer (C) in water at 20 ° C. is preferably less than 5 g / L.

The ethylenically unsaturated monomer (C) can be changed to, for example, n-butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylic rate, puguchi pill (meth) acrylic rate, or 2-ethyl. Xyl (meth) acrylic rate, n-hexyl (meth) acrylate, n-octyl (meth) acrylate, cyclohexyl (meth) acrylate, decyl (meth) acrylate, undecyl (meth) acrylate, lauryl (meth) acrylate, Tridecyl (meth) acrylate, myristyl (meth) acrylate, pentadecyl (meth) acrylate, palmityl (meth) acrylate, heptadecyl (meth) acrylate, stearyl (meth) acrylate, isostearyl (meth) acrylate, oleyl (meth) acrylate, Examples include behenyl (meth) acrylate and ethyl methacrylate. The ethylenically unsaturated monomer (C) contains, for example, at least one selected from the group consisting of the above compounds.

The amount of the ethylenically unsaturated monomer (C) is 35 parts by mass or more and 60 parts by mass or less with respect to 100 parts by mass of the unsaturated monomer (M). In this case, the hydrophobicity of the film becomes stronger, and the water resistance and hair wash resistance of the film can be easily improved.

The unsaturated monomer (M) may further contain an ethylenically unsaturated monomer (D). The ethylenically unsaturated monomer (D) is other than the tertiary cationic unsaturated monomer (A), the anionic unsaturated monomer (B) and the hydrophobic ethylenically unsaturated monomer (C). It is a copolymerizable ethylenically unsaturated monomer and is used to adjust various properties such as the flexibility of the film. The ethylenically unsaturated monomer (D) is, for example, esters of (meth) acrylic acid such as methyl (meth) acrylate and ethyl acrylate; (meth) acrylic acid alkoxyalkyl ester such as methoxyethyl (meth) acrylate; (Meta) acrylic acid hydroxyalkyl esters such as hydroxyethyl (meth) acrylate; monoesters of polyalkylene glycol and (meth) acrylic acid such as polyethylene glycol mono (meth) acrylate and polypropylene glycol mono (meth) acrylate; Examples thereof include those in which the hydroxyl end of the monoester of the polyalkylene glycol and (meth) acrylic acid is alkyl etherified, such as methoxypolyethylene glycol mono (meth) acrylate.

The weight average molecular weight (Mw) of the hair treatment base is preferably 5000 or more and 70,000 or less. In this case, a film having good texture, water resistance, hair washing resistance, and flaking resistance can be obtained. The weight average molecular weight (Mw) is more preferably 5,000 or more and 50,000 or less.

The weight average molecular weight (Mw) is calculated from the result of molecular weight measurement by gel permeation chromatography. The molecular weight measurement by gel permeation chromatography can be performed under the following conditions, for example.

GPC device: Showa Denko SHODEX SYSTEM 11,
Column: 4 series of SHODEX KF-800P, KF-005, KF-003, KF-001,
Mobile phase: THF,
Flow rate: 1 ml / min,
Column temperature: 45 ° C,
Detector: RI,
Conversion: Polystyrene.

The glass transition temperature (Tg) of the hair treatment base is preferably −20 ° C. or higher and 40 ° C. or lower. In this case, in the hair on which the film is formed, a good firmness can be easily obtained, adhesion to the hair can be obtained, and good flaking resistance can be easily obtained. In particular, when the weight average molecular weight (Mw) is 5,000 or more and 50,000 or less and the glass transition temperature (Tg) is -20 ° C or more and 40 ° C or less, the firmness of the hair on which the film is formed can be further improved. it can.

The glass transition temperature (Tg) indicates a value theoretically calculated from the composition ratio of the unsaturated monomer (M), and is a value calculated by the following Fox formula.

1 / Tg = W1 / Tg1 + W2 / Tg2 + ... + Wn / Tgn
Here, the above formula is a calculation formula when a base for hair treatment is obtained by polymerizing n kinds of monomers (n is an integer of 1 or more). W1, W2, ... Wn each indicate the mass fraction of each of the n types of monomers, and Tg1, Tg2, ... Tgn are the glass transition temperatures of the n types of monomers, respectively. The unit of the glass transition temperature in the Fox equation is the absolute temperature "K". However, the above Fox formula is applied only to monofunctional monomers, and does not include polyfunctional monomers. That is, when the unsaturated monomer (M) contains a polyfunctional monomer, only the mass fraction of the monofunctional monomer and each glass transition temperature are applied to the Fox equation to obtain the glass transition temperature ( Tg) shall be calculated.

The hair treatment base can be obtained by copolymerizing an unsaturated monomer (M) in a hydrophilic solvent or in a mixed solvent of water and a hydrophilic solvent. Examples of the method for polymerizing the unsaturated monomer (M) include a solution copolymerization method using a hydrophilic solvent or a mixed solvent of water and a hydrophilic solvent. In the solution polymerization method, an unsaturated monomer (M) is dissolved in a hydrophilic solvent or a mixed solvent, and a radical polymerization initiator is added to prepare a reaction solution, and the reaction solution is subjected to a solvent under a nitrogen stream. Stir at or near the boiling point of. As a result, the unsaturated monomer (M) can be polymerized.

All the monomers may be added to the reaction solvent from the beginning of the polymerization reaction, but depending on the type and amount of the monomers, a single amount may be added to the reaction solution while proceeding with the polymerization reaction. The body may be divided and added. Alternatively, the monomer may be continuously contained in the reaction solution while the polymerization reaction is allowed to proceed. The amount of the hydrophilic solvent is preferably adjusted so that the concentration of the unsaturated monomer (M) present in the solution at the start of the polymerization reaction is 30% by mass or more and 80% by mass or less.

Examples of the hydrophilic solvent include fatty alcohols such as methanol, ethanol, 2-propanol, and butanol; acetone; methyl cellosolve; ethyl cellosolve; dioxane; methyl acetate; ethyl acetate; dimethylformamide. The hydrophilic solvent contains, for example, at least one selected from the group consisting of the above compounds.

In addition, the reaction solution further contains a polymerization initiator. As a result, the unsaturated monomer (M) is polymerized to form a hair treatment base.

The polymerization initiator is not particularly limited and may be appropriately selected. The polymerization initiator is, for example, a radical polymerization initiator. The radical polymerization initiators are, for example, peroxides such as benzoyl peroxide and lauroyl peroxide; and 2,2'-azobisisobutyronitrile, 2,2'-azobis-2-methylbutyronitrile, 2 , 2'-azobis-2,4-dimethylvaleronitrile, 1,1'-azobis-1-cyclohexanecarbonitrile, 4,4'-azobis-4-cyanovaleric acid, and 2,2'-azobis- (2-) Examples thereof include azo compounds such as amidinopropane) -dihydrochloride. The radical polymerization initiator contains, for example, at least one selected from the group consisting of the above compounds.

The amount of the radical polymerization initiator is appropriately selected so that the weight average molecular weight of the hair treatment base and the glass transition temperature become predetermined values. The amount of the radical polymerization initiator may be, for example, 0.1 part by mass or more and 5 parts by mass or less, or 0.2 parts by mass or more and 2 parts by mass or less, based on 100 parts by mass of the total amount of the reactants. May be good.

In addition, a chain transfer agent may be added to the reaction solution as needed to adjust the molecular weight. The chain transfer agent is not particularly limited, and examples thereof include compounds having a mercaptan group such as lauryl mercaptan, dodecyl mercaptan, and thioglycerol; and inorganic salts such as sodium hypophosphite and sodium hydrogen sulfite. The amount of the chain transfer agent is appropriately selected so that the weight average molecular weight (Mw) of the hair treatment base is within a desired range, but usually 0.01 parts by mass with respect to 100 parts by mass of the total amount of the reactants. It is preferably 10 parts by mass or less.

In the present embodiment, when the polymerization reaction is carried out in a mixed solvent of water and a hydrophilic solvent, the amount of the hydrophilic solvent is preferably larger than that of water. In this case, the mass ratio of water to the hydrophilic solvent (water: hydrophilic solvent) is preferably in the range of 1:99 to 30:70.

Further, the polymerization method of the unsaturated monomer (M) is not limited to the solution copolymerization method. For example, a base for hair treatment may be synthesized by subjecting an unsaturated monomer (M) to a polymerization reaction by a living radical polymerization method or an emulsion polymerization method. When an unsaturated monomer (M) is polymerized by a living radical polymerization method to synthesize a base for hair treatment, the weight average molecular weight (Mw) can be easily adjusted and a chain transfer agent is used. A base for hair treatment having a narrower molecular weight distribution is produced.

The conditions of the polymerization reaction such as the reaction temperature and the reaction time are appropriately set according to the type of the unsaturated monomer (M) and the polymerization initiator so that the polymerization reaction proceeds at a high reaction rate. .. The polymerization reaction may be carried out in an atmosphere of an inert gas such as nitrogen gas or argon gas. It is preferable that the amount of unreacted monomer remaining at the end of the polymerization reaction is small.

Then, by the copolymerization reaction of the unsaturated monomer (M), a solution (dispersion liquid) in which the hair treatment base is mixed with the solvent is obtained. A solvent may be appropriately added to the obtained solution (dispersion solution). In this solvent solution, the hair treatment base may be dissolved or dispersed. The solvent solution may further contain additives such as a polymerization inhibitor, a light stabilizer, and a diluting solvent.

The base-containing composition according to the present embodiment is a composition containing a base for hair treatment. The base-containing composition is, for example, a dispersion in which the above-mentioned hair treatment base is mixed with a solvent. The base-containing composition may further contain any additive such as a preservative. Alternatively, the base-containing composition may be a mixture of a hair treatment base obtained by purifying the dispersion and an additive.

<Hair cosmetics>
Next, the hair cosmetic according to this embodiment will be described.

The hair cosmetic contains the above-mentioned base for hair treatment. For this reason, a film containing a hair treatment base is likely to be formed on the surface of the hair, and it is easy to obtain a firm feeling of the hair. Further, when a film is formed on the dyed hair, the film can prevent the dyed hair from fading.

The hair cosmetic contains, for example, only the above-mentioned base-containing composition. In addition to the hair treatment base, the hair cosmetic may further contain cosmetic ingredients other than the hair treatment base. Such cosmetic ingredients include, for example, dyes, pigments, surfactants, moisturizers, UV protection agents, pH regulators, preservatives, antioxidants, chelating agents, thickeners, film-forming agents, and oily ingredients. , Polymer compounds, propellants and the like. The cosmetic ingredient contains, for example, at least one selected from the group consisting of the above compounds.

In the present embodiment, the amount of the base for hair treatment is preferably 2 parts by mass or more and 6 parts by mass or less with respect to 100 parts by mass of the hair cosmetic. As a result, a film is likely to be formed on the surface of the hair to the extent that the hair is not stiff, and it is easy to obtain an appropriate elasticity of the hair. Further, when a film is formed on the dyed hair, the film can prevent the dyed hair from fading.

The dosage form of the hair cosmetic is not particularly limited because it is appropriately selected according to the purpose. Dosage forms of hair cosmetics include, for example, liquid, milky, creamy, gelled, mist, spray, aerosol and mousse.

When the dosage form of the hair cosmetic is a spray, the spray is produced by pressure-sealing the hair cosmetic and the propellant in a pressure-resistant container. The propellant is, for example, liquefied petroleum gas (LPG) such as propane, butane, and isobutane; trichloromonofluoromethane (chlorofluorocarbon 11), dichlorodifluoromethane (chlorofluorocarbon 12), dichlorotetrafluoroethane (chlorofluorocarbon 114), methylene chloride, and the like. And halogenated hydrocarbons such as hydrofluorocarbons (HFC152a, etc.); dimethyl ether; carbon dioxide gas; and nitrogen gas. The propellant contains, for example, at least one selected from the group consisting of, for example, the above compounds.

Further, in the present embodiment, the hair cosmetic may be a hair coloring product. Hair coloring products are, for example, hair dyes or hair dyes. Hair dyes and hair dyes are based on the regulations of the Japan Hair Color Industry Association. The hair dye is, for example, an oxidative hair dye. The hair dye is, for example, one of a hair manicure, a hair color treatment, and a temporary hair dye.

In addition, the hair cosmetic may be an out bath treatment or a hair treatment. Here, since the out bath treatment is used outside the bathroom, it is also generally called as a hair treatment that does not wash away.

Hair cosmetics can be suitably used to form a film on dyed hair (dyed hair). It is generally known that hair damaged by a perm treatment or a coloring treatment is negatively charged. When the hair cosmetic is a hair coloring product, the hair is dyed and a hair treatment base having a cationic functional group adheres to the hair to form a film, and the film is water resistant and wash resistant. Therefore, the film is less likely to come off and the dyed hair is less likely to be discolored. On the other hand, when the hair cosmetic is an out bath treatment or a hair treatment, a hair treatment base having a cationic functional group adheres to the hair to form a film, and the film has water resistance and hair wash resistance. , The film is less likely to come off, and a good firmness can be easily obtained on the treated hair. Further, when a hair cosmetic is used for dyed hair, the film has water resistance and hair wash resistance, so that the dyed hair is less likely to discolor.

<Hair treatment method>
Next, the hair treatment method according to the present embodiment will be described.

The hair treatment method includes applying a hair cosmetic to the hair to form a film containing a hair treatment base on the surface of the hair. As a result, it is easy to obtain a good firmness in the treated hair. Further, when the hair after applying the hair cosmetic is dyed hair, the film has good water resistance and washing resistance, so that it is possible to prevent the dyed hair from fading over time.

The dyed hair is formed by dyeing the hair with a hair dye or a hair dye.

When the hair cosmetic is a hair coloring product such as a hair dye, the hair is dyed and a hair treatment base having a cationic functional group adheres to the hair to form a film, and the film is water resistant. -Because it has hair wash resistance, the film is less likely to come off and the dyed hair is less likely to fade.

In the present embodiment, when applying the hair cosmetic, it is preferable that the amount of the hair cosmetic applied at the root is larger than that at the tip of the hair. In this case, the thickness of the film tends to be larger at the root than at the tip of the hair. As a result, the effect of increasing the volume of the entire hair can be easily obtained.

The hair cosmetic may be brushed or sprayed on the hair. In this case, the hair cosmetic can be applied to the entire hair, and the amount of application at the root can be easily increased as compared with the tip of the hair.

Hereinafter, the present invention will be specifically described with reference to Examples.

Unless otherwise specified, the following "parts" and "%" are all based on mass, and the amounts of each component shown in the table below are all expressed in "parts by mass".

<Base for hair treatment>
[Example 1]
In a 4-neck flask with a capacity of 1 liter equipped with a reflux condenser, a thermometer, a nitrogen blow tube and a stirrer, 200 parts of ethanol and the components shown in Table 1 below were mixed and a mixed solution was charged. .. Then, the temperature of the mixed solution was raised under a nitrogen stream, and when the inside of the four-necked flask reached a reflux state (about 80 ° C.), the polymerization initiator 2,2'-azobisisobutyronitrile was added to the mixed solution by 2. Partially added to prepare a reaction solution. Then, the reaction solution was left in a reflux state for 6 hours to allow the polymerization reaction to proceed. Next, the solvent was distilled off from the solution in the four-necked flask. After distilling off the solvent, ethanol and light isoparaffin were added to adjust the amount of solvent in the four-necked flask. As a result, a solution (base solution) containing a base for hair treatment having a solid content of 40% was obtained.

[Examples 2 to 10, Comparative Examples 1 to 5]
A solution (base solution) containing a hair treatment base having a solid content of 40% shown in Tables 1 and 2 below was obtained by a method according to Example 1.

[Evaluation]
By diluting the base solutions of each Example and Comparative Example with ethanol, a diluted solution containing 10% solid content was prepared. The following evaluation test was conducted using this diluted solution.

{Film water resistance (water resistance of film)}
Diluted solutions (10 g) of each Example and Comparative Example were poured onto a 10 cm × 10 cm boat-shaped PET film. Then, the diluted solution on the PET film was dried to prepare a film. 0.2 mL of purified water was dropped onto this film, the properties of the film were visually observed, and the water resistance was evaluated according to the following criteria.
A: The film does not change at all,
B: The film is swollen or whitened,
C: The film was dissolved.

[Prescription Examples 1 to 16 and Comparative Formulation Examples 1 to 5]
In the evaluation of each formulation example and comparative formulation example, the following model shampoo and model oxidative hair dye were used.

・ Model shampoo

・ Model oxidative hair dye:

<Temporary hair dye>
Using the base solution (solid content concentration 40%) of each Example and Comparative Example, a temporary hair dye having the composition shown in Table 6 below (Prescription Examples 1 to 5 and Comparative Formulation Examples 1 to 2) was prepared. did.

[Evaluation]
{Texture}
To a hair bundle having a length of 10 cm and a mass of about 1 g, 0.3 g of a temporary hair dye of each formulation example and a comparative formulation example was applied and dried. The presence or absence of firmness, elasticity, and stiffness of this hair bundle was evaluated according to the following criteria by touch.
A: I feel a sense of elasticity,
B: I feel a little firmness,
C: I don't feel the elasticity
D: I feel stiff.

{Shampoo resistance}
To a hair bundle having a length of 10 cm and a mass of about 1 g, 0.3 g of a temporary hair dye of each formulation example and a comparative formulation example was applied and dried. The hair bundle was washed once with shampoo, and the hair bundle after washing was dried. Then, the presence or absence of firmness, elasticity, and stiffness of the dried hair bundle was evaluated by the following criteria by touch.
A: It has the same elasticity as before washing hair,
B: The elasticity is a little weaker than before washing the hair,
C: The elasticity is weaker than before washing the hair.

{Flaking resistance}
To a hair bundle having a length of 10 cm and a mass of about 1 g, 0.3 g of a temporary hair dye of each formulation example and a comparative formulation example was applied and dried. After combing the hair bundle three times, the amount of the film shed from the hair bundle was visually evaluated according to the following criteria.
A: I can't confirm the film that has fallen off.
B: The peeled film can be confirmed a little,
C: Many films have fallen off.

{Suppression of discoloration}
To a hair bundle having a length of 10 cm and a mass of about 1 g, 0.3 g of a temporary hair dye of each formulation example and a comparative formulation example was applied and dried. The hair bundle was washed once with shampoo, and the hair bundle after washing was dried. Then, the discoloration of the dried hair bundle was evaluated according to the following criteria.
A: It has the same color as before washing hair,
B: The color is slightly less than before washing the hair.
C: The color is less than before washing the hair.

<Hair manicure (acidic hair dye)>
Using the base solution (solid content concentration 40%) of each Example and Comparative Example, an acidic hair dye having the composition shown in Table 7 below (Prescription Examples 6 to 10 and Comparative Formulation Examples 3 to 4) was prepared. did.

[Evaluation]
{Texture}
The acidic hair dyes of each formulation example and comparative formulation example were evenly (uniformly) applied to a hair bundle having a length of 10 cm and a mass of about 1 g, and left to stand for 5 minutes. Then, the hair bundle was washed with water and then dried. The dry hair bundles were evaluated for firmness, elasticity, and stiffness by touch according to the following criteria.
A: I feel a sense of elasticity,
B: I feel a little firmness,
C: I don't feel the elasticity
D: I feel stiff.

{Shampoo resistance}
The acidic hair dyes of each formulation example and comparative formulation example were evenly (uniformly) applied to a hair bundle having a length of 10 cm and a mass of about 1 g, and left to stand for 5 minutes. Then, the hair bundle was washed with shampoo 10 times, and the hair bundle after washing was dried. Then, the presence or absence of firmness, elasticity, and stiffness of the dried hair bundle was evaluated by the following criteria by touch.
A: It has the same elasticity as before washing hair,
B: The elasticity is a little weaker than before washing the hair,
C: The elasticity is weaker than before washing the hair.

{Flaking resistance}
The acidic hair dyes of each formulation example and comparative formulation example were evenly (uniformly) applied to a hair bundle having a length of 10 cm and a mass of about 1 g, and left to stand for 5 minutes. Then, the hair bundle was washed with water and then dried. After combing the dried hair bundle three times, the amount of the film shed from the hair bundle was visually evaluated according to the following criteria.
A: I can't confirm the film that has fallen off.
B: The peeled film can be confirmed a little,
C: Many films have fallen off.

{Suppression of discoloration}
The acidic hair dyes of each formulation example and comparative formulation example were evenly (uniformly) applied to a hair bundle having a length of 10 cm and a mass of about 1 g, and left to stand for 5 minutes. Then, the hair bundle was washed with shampoo 10 times, and the hair bundle after washing was dried. Then, the discoloration of the dried hair bundle was evaluated according to the following criteria.
A: It has the same color as before washing hair,
B: The color is slightly less than before washing the hair.
C: The color is less than before washing the hair.

<Out bath treatment>
Using the base solution (solid content concentration 40%) of each Example and Comparative Example, out bath treatments (formulation examples 11 to 16 and comparative formulation examples 5 to 6) having the compositions shown in Table 8 below were prepared. did.

[Evaluation]
{Texture}
A hair bundle having a length of 10 cm and a mass of about 1 g was dyed with an oxidative hair dye. Then, the dyed hair bundle was washed once with shampoo, and the hair bundle after washing was dried. Out bath treatments of each formulation example and comparative formulation example were applied to the hair bundles and dried. For the hair bundles to which the out bath treatment was applied, the presence or absence of firmness, elasticity and stiffness was evaluated by the following criteria by touch.
A: I feel a sense of elasticity,
B: I feel a little firmness,
C: I don't feel the elasticity
D: I feel stiff.

{Shampoo resistance}
A hair bundle having a length of 10 cm and a mass of about 1 g was dyed with an oxidative hair dye. Then, the dyed hair bundle was washed once with shampoo, and the hair bundle after washing was dried. Out bath treatments of each formulation example and comparative formulation example were applied to the hair bundles and dried. The hair bundle to which the out bath treatment was applied was washed 10 times with the above shampoo, and the hair bundle after washing was dried. Then, the presence or absence of firmness, elasticity, and stiffness of the dried hair bundle was evaluated by the following criteria by touch.
A: It has the same elasticity as before washing hair,
B: The elasticity is a little weaker than before washing the hair,
C: The elasticity is weaker than before washing the hair.

{Flaking resistance}
A hair bundle having a length of 10 cm and a mass of about 1 g was dyed with an oxidative hair dye. Then, the dyed hair bundle was washed once with shampoo, and the hair bundle after washing was dried. Out bath treatments of each formulation example and comparative formulation example were applied to the hair bundles and dried. After combing the hair bundle to which the out bath treatment was applied three times, the amount of the film shed from the hair bundle was visually evaluated according to the following criteria.
A: I can't confirm the film that has fallen off.
B: The peeled film can be confirmed a little,
C: Many films have fallen off.

{Suppression of discoloration}
Hair having a length of 10 cm and a mass of about 1 g was dyed with an oxidative hair dye. Then, the dyed hair bundle was washed once with shampoo, and the hair bundle after washing was dried. Out bath treatments of each formulation example and comparative formulation example were applied to the hair bundles and dried. The hair bundle to which the out bath treatment was applied was washed 10 times with the above shampoo, and the hair bundle after washing was dried. Then, the discoloration of the dried hair bundle was evaluated according to the following criteria.
A: It has the same color as before washing hair,
B: The color is slightly less than before washing the hair.
C: The color is less than before washing the hair.

Claims (10)

An unsaturated monomer (M) containing a tertiary cationic unsaturated monomer (A), an anionic unsaturated monomer (B), and a hydrophobic ethylenically unsaturated monomer (C). Is a copolymer of
The amount of the tertiary cationic unsaturated monomer (A) is 3 parts by mass or more and 20 parts by mass or less with respect to 100 parts by mass of the unsaturated monomer (M).
The amount of the anionic unsaturated monomer (B) is 1 part by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the unsaturated monomer (M).
The amount of the ethylenically unsaturated monomer (C) is 35 parts by mass or more and 60 parts by mass or less with respect to 100 parts by mass of the unsaturated monomer (M).
Base for hair treatment. The tertiary cationic unsaturated monomer (A) has a structure represented by the following formula (1).
The base for hair treatment according to claim 1,

In formula (1), R is H or CH ₃ , A is O or NH, k is an integer in the range 1-4, m is an integer in the range 1-4, and n. Is an integer in the range 1-4. The weight average molecular weight is 5,000 or more and 50,000 or less.
The base for hair treatment according to claim 1 or 2. The glass transition temperature is −20 ° C. or higher and 40 ° C. or lower.
The base for hair treatment according to any one of claims 1 to 3. The molar percentage of the tertiary cationic unsaturated monomer (A) with respect to the anionic unsaturated monomer (B) is 50 mol% or more and 350 mol% or less.
The base for hair treatment according to any one of claims 1 to 4. A hair cosmetic containing the base for hair treatment according to any one of claims 1 to 5. The hair cosmetic according to claim 6, which is a hair coloring product. The hair cosmetic according to claim 7, which is a hair dye or a hair dye. The hair cosmetic according to claim 6, which is an out bath treatment or a hair treatment. The present invention comprises forming a film containing the hair treatment base according to any one of claims 1 to 5 on the surface of the dyed hair.
Hair treatment method.