JP3101517B2 - Aerosol hairdressing base - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base for aerosol hair styling. More specifically, an aerosol with excellent adhesion to hair, strong setting under high humidity, less flaking, excellent hair washability, and excellent flexibility while maintaining excellent water resistance The present invention relates to a hairdressing base.

[0002]

2. Description of the Related Art Conventionally, there are anionic, cationic and amphoteric bases for aerosol hair styling agents.
No. 8 and Japanese Patent Publication No. 50-6538 are known.

However, these resins are difficult to remove by shampooing because of their poor water solubility, and because they exhibit anionic properties, they have poor adhesion to hair and the resin is peeled off on the hair. A so-called flaking phenomenon, which became powdery, occurred.

[0004] Japanese Patent Publication No. 58-46482 discloses a hair fixing composition. It is known that the resin used in such a hair fixing composition has high water solubility and setting power. Have been.

[0005] However, such a resin has the disadvantage that the setting force is reduced under high humidity and the resin film formed on the hair is hard, so that a flaking phenomenon occurs.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above prior art, and is excellent in water solubility and detergency, has good adhesion, does not cause flaking, and has high humidity. Offers a base for aerosol hair styling products that has excellent set power, transparency, glossiness, compatibility with ethanol and liquefied petroleum gas, and excellent flexibility while maintaining excellent water resistance. It is intended to do so.

[0007]

The present invention provides (A) a compound represented by the following general formula (I):

[0008]

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(Wherein, R ¹ represents a hydrogen atom or a methyl group).
5% by weight, (B) general formula (II):

[0010]

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Wherein X is an imino group or an oxygen atom;
¹ represents a hydrogen atom or a methyl group, R ² represents an alkylene group having 1 to 3 carbon atoms, and R ³ , R ⁴ , R ⁵ and R ⁶ each independently represent a methyl group or an ethyl group. 1) to 25% by weight, (C) the general formula (II)
I):

[0012]

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(Wherein R ¹ is a hydrogen atom or a methyl group,
R ⁷ represents an alkyl group having 2 to 8 carbon atoms) or a monomer (C-1)
1) and general formula (IV):

[0014]

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(Wherein R ¹ is a hydrogen atom or a methyl group,
Monomer R ⁸ is a monomer represented by an alkyl group having 1 to 18 carbon atoms) (C-2) (C ) 35~85
% By weight, and (D) a general formula (V):

[0016]

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(Wherein R ¹ is a hydrogen atom or a methyl group,
R ⁹ represents a methyl group or an ethyl group, and n represents an integer of 1 to 23). (A) An aerosol hair styling comprising a copolymer obtained by polymerizing a monomer component containing 1 to 20% by weight of a monomer (D) The present invention relates to a pharmaceutical base.

[0018]

Action and Examples As described above, the base for hair styling of the present invention comprises (A) the general formula (I):

[0019]

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(Wherein, R ¹ represents a hydrogen atom or a methyl group).
5% by weight, (B) general formula (II):

[0021]

Embedded image

(Wherein, X is an imino group or an oxygen atom;
¹ represents a hydrogen atom or a methyl group, R ² represents an alkylene group having 1 to 3 carbon atoms, and R ³ , R ⁴ , R ⁵ and R ⁶ each independently represent a methyl group or an ethyl group. 1) to 25% by weight, (C) the general formula (II)
I):

[0023]

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(Wherein R ¹ is a hydrogen atom or a methyl group,
R ⁷ represents an alkyl group having 2 to 8 carbon atoms) or a monomer (C-1)
1) and general formula (IV):

[0025]

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(Wherein R ¹ is a hydrogen atom or a methyl group,
Monomer R ⁸ is a monomer represented by an alkyl group having 1 to 18 carbon atoms) (C-2) (C ) 35~85
% By weight, and (D) a general formula (V):

[0027]

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(Wherein R ¹ is a hydrogen atom or a methyl group,
R ⁹ represents a methyl group or an ethyl group, and n represents an integer of 1 to 23). A copolymer obtained by polymerizing a monomer component containing 1 to 20% by weight of a monomer (D) represented by the formula: > of that it is also of the.

In the present invention, a monomer component containing the (meth) acrylic acid (A), the monomer (B), the monomer (C) and the monomer (D) in a specific ratio is used. A base for an aerosol hair styling agent which can simultaneously satisfy the above excellent physical properties can be obtained.

The (meth) acrylic acid (A) (hereinafter referred to as monomer (A)) used in the present invention is represented by the general formula (I) as described above.

In the present invention, since the monomer (A) is used, the base for aerosol hair styling expresses excellent water solubility and enables hair removal. These can be used alone or as a mixture of two types.

The amount of the monomer (A) used is at least 10% by weight, preferably at least 12% by weight, more preferably at least 15% by weight, based on the monomer component to be subjected to polymerization. If the amount of the monomer (A) is too small, the resulting film formed from the base for aerosol hair styling exhibits poor water solubility, making it difficult to wash and remove the hair. The amount of the monomer (A) used is 45% by weight based on the amount of the monomer component used for polymerization.
Or less, preferably 40% by weight or less, more preferably 3% by weight or less.
5% by weight or less. If the amount of the monomer (A) used is too large, the obtained aerosol hairdressing base will have high hygroscopicity, and will be sticky or have a reduced setting power under high humidity.

In the present invention, one of the great features of using the monomer (B) is that the film formed from the base for aerosol hair styling obtained by using the monomer (B) has flexibility. Such a monomer (B) is a useful component for the base for the aerosol hair styling agent, because it has high adhesion to hair and no flaking.

Representative examples of the monomer (B) include, for example, N- (meth) acryloxyethyl-N-ethyl-
N, N-dimethylammonium ethyl sulfate, N
-(Meth) acryloxyethyl-N, N, N-trimethylammonium methyl sulfate, N- (meth) acryloxyethyl-N, N, N-triethylammonium ethyl sulfate, N- (meth) acryloxyethyl-N, N-diethyl-N-methylammonium methyl sulfate, N- (meth) acryloxypropyl-N-
Ethyl-N, N-dimethylammonium ethyl sulfate, N- (meth) acryloxypropyl-N, N, N
-Trimethyl ammonium methyl sulfate, N-
(Meth) acrylamidopropyl-N-ethyl-N, N
-Dimethylammonium ethyl sulfate, N- (meth) acrylamidopropyl-N, N, N-trimethylammonium methyl sulfate and the like, and these can be used alone or in combination of two or more.

The amount of the monomer (B) used is at least 1% by weight, preferably at least 3% by weight, more preferably at least 5% by weight, based on the monomer component to be subjected to polymerization. If the amount of the monomer (B) is too small, the flexibility of the obtained film formed from the base for aerosol hairdressing decreases, the adhesion to hair decreases, and the flaking phenomenon occurs. It will happen. The amount of the monomer (B) used is not more than 25% by weight, preferably not more than 20% by weight, more preferably not more than 18% by weight, based on the monomer component used for the polymerization. If the amount of the monomer (B) is too large, the flexibility of the obtained film formed from the base for aerosol hair styling becomes high, and the film becomes sticky or has a setting power under high humidity. Will decrease.

In the present invention, the compound represented by the general formula (III)
Or the monomer (C-1) represented by
A monomer (C) which is a monomer (C-1) and a monomer (C-2) represented by the general formula (IV) is used, and a base for an aerosol hairdressing agent obtained by using the monomer (C) is used. Has moderate hardness and water resistance.

The monomer (C-1) used as the monomer (C) is a component mainly for imparting appropriate hardness to a film formed from a base for an aerosol hairdressing agent.

Representative examples of the monomer (C-1) include, for example, N-ethyl (meth) acrylamide,
(meth) acrylamides such as n-butyl (meth) acrylamide, Nt-butyl (meth) acrylamide, Nn-octyl (meth) acrylamide, Nt-octyl (meth) acrylamide and N-dodecylacrylamide These can be used alone or in combination of two or more.

The monomer (C-2) used as the monomer (C) is a component that mainly imparts appropriate water resistance to a film formed from the base for an aerosol hairdressing agent.

In the general formula (IV) representing the monomer (C-2), R ⁸ represents an alkyl group having 1 to 18 carbon atoms. If the set force of the aerosol hairdressing base decreases and the film formed from the base for aerosol hairdressing becomes hard and a flaking phenomenon may occur, and if the carbon number is too large, the It is preferable that the alkyl group has 2 to 12 carbon atoms, since the resulting film tends to have poor water solubility, which may make it difficult to remove hair.

Representative examples of the monomer (C-2) include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n
-Butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylate, hexyl (meth) acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, tridecyl (meth) And (meth) acrylic acid alkyl esters such as acrylate, cetyl (meth) acrylate and stearyl (meth) acrylate, and these can be used alone or in combination of two or more.

The amount of the monomer (C) used is at least 35% by weight, preferably at least 40% by weight, more preferably at least 45% by weight, based on the monomer component to be subjected to polymerization. When the amount of the monomer (C) used is too small, the water resistance of the film formed from the obtained aerosol hairdressing base decreases, the setting force under high humidity decreases, and the hardness decreases. Becomes insufficient.
The amount of the monomer (C) used is not more than 85% by weight, preferably 8% by weight, based on the monomer component used for the polymerization.
0% by weight or less, more preferably 75% by weight or less. If the amount of the monomer (C) used is too large, the film formed from the obtained base for aerosol hair styling becomes brittle, causing a flaking phenomenon or exhibiting poor water solubility, making it difficult to remove hair. This can be difficult.

In the present invention, as described above, the monomer (C) may be the monomer (C-1),
Is a monomer (C-1) and a monomer (C-2 ) , and the monomer (C-1) and the monomer (C-
When 2) is used in combination, the resulting film formed from the base for an aerosol hair styling agent becomes too hard and brittle, causing a flaking phenomenon or an excessive increase in water resistance, thus making it difficult to remove hair. In addition to being extremely difficult, there is an advantage that there is no possibility that inconveniences such as a decrease in smoothness will occur.

The monomer (C-1) and the monomer (C-
The proportion of both monomers used in combination with 2) is not particularly limited, but considering the balance of physical properties such as water resistance and hardness imparted to the film, the monomer (C)
-1) / Monomer (C-2) (weight ratio) is 30 / 70-
It is preferable to adjust so as to be about 70/30.

In the present invention, the use of the monomer (D) also has one of the major features.
A film formed from a base for an aerosol hair styling agent obtained by using a monomer (D), which has flexibility while maintaining excellent water resistance and has no flaking.
Is a particularly useful component for the aerosol hairdressing base.

Examples of the monomer (D) include methoxyethyl (meth) acrylate, ethoxyethyl (meth) acrylate, methoxypolyethylene glycol mono (meth) acrylate, ethoxypolyethylene glycol mono (meth) acrylate, and the like. Or a mixture of two or more.

In the general formula (V) representing the monomer (D), n is an integer of from 1 to 23. If n is too large, it is formed from the obtained aerosol hair styling base. Since the moisture resistance of the resulting film tends to be reduced and sticky, or the compatibility with the propellant tends to be reduced when an aerosol hairdressing agent is prepared from the base for an aerosol hairdressing agent, the n is 1 It is preferably an integer of from 9 to 9.

The amount of the monomer (D) used is at least 1% by weight, preferably at least 3% by weight, more preferably at least 5% by weight, based on the monomer components to be subjected to polymerization. If the amount of the monomer (D) is too small, the resulting film formed from the base for aerosol hair styling may be too hard and cause flaking. The amount of the monomer (D) used is 20% by weight based on the amount of the monomer component used for the polymerization.
Or less, preferably 18% by weight or less, more preferably 1% by weight or less.
5% by weight or less. If the amount of the monomer (D) is too large, the film formed from the base for the aerosol hairdressing agent becomes too soft to maintain the setting force for a long time, or the aerosol injection The compatibility with the agent may be reduced.

In the present invention, the monomer (A), the monomer (B) and the monomer (C) may be used, if necessary, in order to change the feel and feel of the film formed from the obtained aerosol hairdressing base. Further, an ethylenically unsaturated monomer (E) copolymerizable with the monomer (D) (hereinafter, referred to as a monomer (E)) may be contained in a monomer component to be subjected to polymerization.

Representative examples of the monomer (E) include, for example, maleic acid, itaconic acid, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, polyethylene glycol mono (meth) acrylate, Polypropylene glycol mono (meth) acrylate, methoxypolypropylene glycol mono (meth) acrylate, vinylpyrrolidone, (meth) acrylamide, diacetoneacrylamide, vinyl acetate, styrene, etc., and these can be used alone or as a mixture of two or more. Can be used.

The amount of the monomer (E) used is desirably 1% by weight or more, preferably 3% by weight or more, more preferably 5% by weight or more, based on the monomer components to be subjected to polymerization. When the amount of the monomer (E) is too small, the obtained base for aerosol hair styling tends to be less likely to exhibit a desired texture and feel. The amount of the monomer (E) used is desirably 30% by weight or less, preferably 25% by weight or less, and more preferably 20% by weight or less, based on the monomer components to be subjected to polymerization. If the amount of the monomer (E) is too large, there is a tendency that the obtained base for aerosol hair styling may impair physical properties such as setting power under high humidity and water resistance.

The base for the aerosol hairdressing composition of the present invention is prepared by adjusting the desired amount using the monomers (A) to (D) and, if necessary, the monomer (E), and polymerizing in a hydrophilic solvent. Obtained by

As used herein, the term "hydrophilic solvent" refers to an organic solvent having a solubility in water of at least 3.5 g / 100 g of water (25 ° C.), preferably at least 10 g / 100 g of water (25 ° C.). Representative examples of such a hydrophilic solvent include, for example, aliphatic mono- to tetra-hydric alcohols having 1 to 4 carbon atoms, ethyl cellosolve, butyl cellosolve, dioxane, ethyl acetate, dimethylformamide, tetrahydrofuran and the like. Mixtures of more than one species can be used, and among these, aliphatic monohydric alcohols are particularly preferred for handling as cosmetic raw materials.

Specific examples of the aliphatic monohydric alcohol include, for example, methanol, ethanol, n-propanol, isopropanol, n-butanol, s-butanol and t-butanol. Further, specific examples of the aliphatic dihydric alcohol include, for example, ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol and the like. Further, specific examples of the aliphatic trihydric alcohol include, for example, glycerin and trimethylolpropane. Specific examples of the aliphatic tetrahydric alcohol include, for example, pentaerythritol.

In addition, the base for aerosol hair styling of the present invention may adhere to the skin of a human body. Therefore, in consideration of such safety, among the hydrophilic solvents, ethanol, isopropanol, n-butanol are preferable. Is particularly preferred.

The hydrophilic solvent can be used as a mixed solvent with water. When used as a mixed solvent with such water, if the amount of water is too large, during polymerization,
The amount of water should be 50% by weight or less based on the total amount of the solvent, since blocking or agglomeration occurs, and the copolymer constituting the target aerosol hairdressing base material tends to be difficult to obtain. Is preferred.

In the polymerization, the monomers (A) to (D)
If necessary, a monomer component comprising the monomer (E) is dissolved in the hydrophilic solvent, a polymerization initiator is added, and the mixture is stirred while heating in an inert gas atmosphere such as nitrogen gas. It is.

The polymerization initiator is not particularly limited as long as it is generally used, and typical examples thereof include benzoyl peroxide, lauroyl peroxide, di-t-butyl peroxide, t-t-butyl peroxide and t-butyl peroxide.
Peroxides such as butylcumyl peroxide, t-butylperoxyneodecanate, t-hexylperoxyneodecanate, t-butylperoxyisopropylcarbonate, azobisisobutyronitrile, azobisdimethylvaleronitrile, dimethyl Examples include azo compounds such as azobisisobutyrate and azobis-2-methylbutyronitrile.

In the polymerization, it is preferable to adjust the hydrophilic solvent so that the concentration of the monomer component used for the polymerization is about 30 to 70% by weight. When the concentration of the monomer component is more than 50% by weight, the polymerization is performed while dividing the monomer component and gradually adding the monomer component, thereby avoiding rapid generation of polymerization heat and safely polymerizing. It is preferable for performing.

The polymerization temperature depends on the type of polymerization initiator used and cannot be unconditionally determined. However, it is usually preferable to set the polymerization initiator to a 10-hour half-life temperature. It is preferable that the temperature is close to the reflux temperature because the polymerization can be carried out with high reproducibility.

If the polymerization time is too short,
The polymerization may be incomplete and unreacted monomer components may remain.
Preferably, it is time.

The presence or absence of the residual monomer component can be confirmed by examining whether or not a double bond exists by a general method, for example, the PSDB method.

The aerosol hairdressing base of the present invention comprising the copolymer thus obtained can be used in the state of a polymer solution or in the state where the solvent has been removed, but it further imparts water solubility. Therefore, it is preferable to add a water-soluble basic substance to the base for aerosol hair styling and neutralize the base.

In this case, the degree of neutralization of the carboxyl groups in the obtained copolymer is 40 mol% or more, preferably 50 mol% or more.
Desirably, it is at least 60 mol%, more preferably at least 60 mol%. If the neutralization ratio is too low, the resulting aerosol hairdressing base tends to have low water solubility, resulting in poor cleaning properties. Also,
The neutralization rate is 95 mol% or less, preferably 90 mol%.
Below, it is more desirable to be 85 mol% or less. If the neutralization rate is too high,
There is a tendency that the water resistance of the film formed from the base for the aerosol hair styling agent is reduced.

Representative examples of the water-soluble basic substance include:
For example, aqueous ammonia, monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, morpholine, aminomethylpropanol, aminomethylpropanediol, aminoethylpropanediol, and the like can be mentioned alone. Alternatively, two or more kinds can be used as a mixture.

When the aerosol hairdressing base of the present invention is used in an aerosol product, for example, the aerosol hairdressing base is dissolved in the hydrophilic solvent used as a polymerization solvent, and liquefied petroleum gas ( Hereinafter, referred to as LPG),
The aerosol container may be pressurized and filled together with an aerosol propellant such as natural gas, butane, or dimethyl ether, other additives, and auxiliary agents, and then sealed. In this case, it is usually desirable that the mixing ratio of the various components to be filled in the aerosol container is appropriately adjusted according to the intended use or the like.

Next, the base for an aerosol hairdressing composition of the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

Example 1 A five-necked flask equipped with a reflux condenser, a dropping funnel, a thermometer, a nitrogen inlet tube and a stirrer was charged with 15 parts of acrylic acid (parts by weight, hereinafter the same), N-acryloxyethyl- N-
11.8 parts of an ethanol solution of ethyl-N, N-dimethylammonium ethyl sulfate (concentration: 85% by weight),
40 parts of Nt-butylacrylamide, 30 parts of ethyl acrylate, 5 parts of 2-methoxyethyl acrylate and 98.2 parts of absolute ethanol were added, and heated to 80 ° C. in a stream of nitrogen while stirring. When the reflux started, 0.1 part of 2,2'-azobisisobutyronitrile was added to initiate polymerization. Six hours after the start of the polymerization, 0.1 part of 2,2'-azobisisobutyronitrile was added,
The polymerization was completed for 2 hours to complete the reaction.

Next, 27.8 parts of an ethanol solution of aminomethylpropanol (concentration: 50% by weight) was added to neutralize. The obtained aerosol hairdressing base is an ethanol solution having a carboxyl group neutralization ratio of 75 mol% and a resin solid content of 50% by weight. The obtained aerosol hairdressing base has a viscosity average molecular weight of 39000.

The appearance, water solubility, compatibility with ethanol and compatibility with LPG as a representative of the propellant for aerosol were determined by the following methods as physical properties of the obtained base for aerosol hair styling. Examined. Table 1 shows the results.

(A) Appearance An ethanol solution containing 30% by weight of the obtained base for aerosol hair styling was prepared, and its appearance (color tone) was visually observed.

(B) Water solubility An ethanol solution containing 30% by weight of the obtained base for aerosol hair styling was prepared, water was added while maintaining the solution temperature at 25 ° C., and the water solubility was evaluated according to the following evaluation criteria. It was evaluated based on:

(Evaluation Criteria) A: Infinite dilution. B: Polymer is coagulated and precipitated when water is added.

(C) Compatibility with Ethanol An ethanol solution containing 10% by weight of the obtained base for aerosol hair styling was prepared, and the temperature of the solution was maintained at 10 to 20 ° C. The evaluation was based on the evaluation criteria.

(Evaluation Criteria) A: No change is observed. B: Turbidity occurs. C: The polymer is coagulated and precipitated.

(D) Compatibility with LPG An ethanol solution containing 10% by weight of the obtained base for an aerosol hairdressing agent was prepared, and 10 g of the ethanol solution was placed in a pressure-resistant aerosol glass bottle (full volume: 80 ml), and a valve was prepared. And the above glass bottle was filled with LPG as a propellant at room temperature (25 ° C.) at a pressure of 4 kg / cm ² .

The amount of LPG used when fogging occurred on the inner wall of the glass bottle was measured, and the compatibility (limit value (%)) with LPG was determined based on the following equation.

[0078]

(Equation 1)

Examples 2 to 15 and Comparative Examples 1 to 18 Example 1 was repeated except that the monomer components and the amounts used were changed as shown in Tables 3 and 4.
A base for an aerosol hairdressing agent was obtained in the same manner as described above.

The viscosity-average molecular weight and physical properties of the obtained aerosol hairdressing preparation were examined in the same manner as in Example 1. The results are shown in Tables 1 and 2.

Tables 3 and 4 also show the amount of aminomethylpropanol added to the ethanol solution and the carboxyl group neutralization ratio.

The abbreviations in Tables 3 and 4 mean the following substances.

AA: Acrylic acid MAA: Methacrylic acid DMADS: N-acryloxyethyl-N-ethyl-
N, N-dimethylammonium ethyl sulfate DMDS: N-methacryloxyethyl-N-ethyl-
N, N-dimethylammonium ethyl sulfate DMAPADS: N-acrylamidopropyl-N-ethyl-N, N-dimethylammonium ethyl sulfate t-BuAAm: Nt-butylacrylamide N-OAAm: Nt-octylacrylamide EA: ethyl acrylate TBA: t-butyl acrylate LA: lauryl acrylate STA: stearyl acrylate EMA: ethyl methacrylate TBMA: t-butyl methacrylate LMA: lauryl methacrylate IBMA: isobutyl methacrylate SMA: stearyl methacrylate click relay preparative M TA: 2-methoxyethyl acrylate MTMA: 2 -Methoxyethyl methacrylate ETMA: 2-ethoxyethyl methacrylate NEGMA: Methoxy nonaethylene Glycol methacrylate DAAM: diacetone acrylamide HPA: hydroxypropyl acrylate TBAMA: t-butylaminoethyl methacrylate AMP: aminomethylpropanol

[0084]

[Table 1]

[0085]

[Table 2]

[0086]

[Table 3]

[0087]

[Table 4]

From the results shown in Table 1, Examples 1 to 15 were obtained.
Each of the bases for aerosol hair styling obtained in the above
It can be seen that the compound is excellent in water solubility, compatibility with ethanol, and compatibility with LPG.

Formulation Examples 1 to 15 and Comparative Formulation Examples 1 to 18 10 g of an ethanol solution containing 10% by weight of the resin component of the aerosol hairdressing base obtained in Examples 1 to 15 and Comparative Examples 1 to 18 Then, 10 g of LPG as a propellant was filled in an aerosol container (full injection amount: 80 ml), and a valve was attached to the container to prepare an aerosol product for hairdressing.

Next, using the obtained aerosol product for hairdressing, the setting power and water resistance of the base for aerosol hairdressing under high humidity and the physical properties of the film were examined according to the following methods. The results are shown in Tables 5 and 6.

(A) Setting force under high humidity 20 g of the above-mentioned aerosol product was applied to 2 g of hair having a length of 25 cm.
After spraying from a distance of m for 10 seconds, the hair was wound around a curler having an outer diameter of 1.2 cm and dried with warm air at 40 ° C for 60 minutes. After this, the hair was removed from the curler, and the length immediately after hanging it vertically in an atmosphere at a temperature of 30 ° C. and a relative humidity of 80% (L ₁ (cm)) and the length after standing for 2 hours (L ₂ (cm)) ) Was measured, and the curl retention was calculated based on the following equation.

[0092]

(Equation 2)

In addition, those having a curl retention of 60% or more were judged as acceptable, and those having a curl retention of less than 60% were judged as unacceptable.
Less than B was designated as B, and less than 60% was designated as C.

(B) Water resistance The above-mentioned aerosol product is applied to 2 g of hair having a length of 25 cm by 20 c.
After spraying from a distance of 5 m for 5 seconds, the hair was given an outer diameter of 1.
It was wound around a 2 cm curler and dried with warm air at 40 ° C. for 60 minutes. After that, water was sprayed for 5 seconds by a pump spray and suspended vertically in an atmosphere of a temperature of 20 ° C. and a relative humidity of 50%, and the same curl as in (a) the setting force under high humidity was examined. Using the equation for determining retention, the time required for the curl retention to become 40% or less was measured and evaluated based on the following evaluation criteria.

(Evaluation Criteria) A: 7 minutes or more. B: 5 minutes or more and less than 7 minutes. C: Less than 5 minutes.

(C) Physical properties of the film (i) Detergency The aerosol product was sprayed onto a glass plate 2.5 cm long and 7.5 cm wide from a distance of 20 cm for 5 seconds.
Air-dried at 3 ° C. for 3 hours to form a film. This glass plate was immersed in warm water containing 0.2% shampoo at 40 ° C., and the change with time in the dissolution state of the film was examined and evaluated based on the following evaluation criteria.

(Evaluation Criteria) A: Completely dissolved within 10 minutes. B: Dissolve completely within 15 minutes. C: The film remains even after 15 minutes.

(Ii) Blocking resistance The above-mentioned aerosol product was applied to 2 g of hair having a length of 25 cm by 20 c.
m for 5 seconds and applied uniformly. The hair was dried with warm air at 40 ° C. for 60 minutes, and the state of the comb was evaluated using a commercially available comb based on the following evaluation criteria.

(Evaluation Criteria) A: There is no snagging and the comb passes smoothly. B: There is some binding, but combing is possible. C: Comb does not pass.

(Iii) Smoothness The aerosol product was sprayed onto a glass plate 2.5 cm long and 7.5 cm wide from a distance of 20 cm for 5 seconds.
Air-dried at 3 ° C. for 3 hours to form a film. Next, the feel of the formed film surface was examined with a finger, and the smoothness was evaluated based on the following evaluation criteria.

(Evaluation Criteria) A: Completely smooth. B: Somewhat smooth. C: There is roughness.

(Iv) Transparency The aerosol product was sprayed onto a glass plate 2.5 cm long and 7.5 cm wide from a distance of 20 cm for 5 seconds.
Air-dried at 3 ° C. for 3 hours to form a film. Next, the state of the formed film was visually observed and evaluated based on the following evaluation criteria.

(Evaluation Criteria) A: Completely transparent. B: Partially whitened. C: The entire surface is whitened.

(V) Glossiness The above-mentioned aerosol product was applied to 2 g of hair having a length of 25 cm by 20 c.
m for 5 seconds and applied uniformly. The hair was dried with warm air at 40 ° C. for 60 minutes, visually observed for glossiness, and evaluated based on the following evaluation criteria.

(Evaluation Criteria) A: Very glossy. B: There is some gloss. C: No gloss.

(Vi) Flexibility 20 g of the aerosol product is applied to 1 g of hair having a length of 10 cm.
After spraying for 5 seconds from a distance of m, bundle the hair neatly,
It was dried with warm air of 40 ° C. for 60 minutes. After this,
Under an atmosphere of a temperature of 20 ° C. and a relative humidity of 50%, the hair was folded in half from the center and creased. The peeled state of the resin film at the fold was visually observed, and evaluated based on the following evaluation criteria.

(Evaluation Criteria) A: No peeling of the resin film occurred. B: The resin film is partially peeled. C: The resin film is totally peeled off, and white powder is generated.

[0108]

[Table 5]

[0109]

[Table 6]

From the results shown in Tables 5 and 6, the hair styling aerosol products obtained in Formulation Examples 1 to 15 were different from the hair styling aerosol products obtained in Comparative Formulation Examples 1 to 18. It also has the setting power and water resistance under high humidity required as a hairdressing agent, and the formed film combines washing property, blocking resistance, smoothness, transparency, gloss and flexibility at the same time. You can see that there is.

In particular, the aerosol products for hair styling of Formulation Examples 1 to 12 are composed of the monomer (C-1) and the monomer (C-
2) is obtained using the base for an aerosol hairdressing agent used in combination with the above, so that the formed film has more excellent detergency compared to the hairdressing aerosol products of Formulation Examples 13 to 15 . It can be seen that they have blocking resistance and smoothness.

[0112]

The base for aerosol hair styling of the present invention is excellent in water solubility and detergency, and can be suitably used for mist and mousse requiring an aqueous formulation, and has good adhesion to hair. It has good blocking resistance and good flaking resistance.

Further, the base for aerosol hair styling of the present invention is excellent in water resistance and has a strong setting force under high humidity, so that it can be set to an arbitrary hair style and held for a long time. It has the effect.

Further, the base for aerosol hair styling of the present invention has excellent transparency, gloss and smoothness, and excellent compatibility with ethanol and liquefied petroleum gas. When used for an aerosol product, it has an excellent effect that it can be ejected from the aerosol container in a uniform state and to the end.

Further, the base for an aerosol hair styling agent of the present invention has excellent flexibility in the formed film.
It has an excellent effect of setting a natural texture with less flaking and stiffness.

Continuation of front page (56) References JP-A-57-169413 (JP, A) JP-A-7-285831 (JP, A) JP-A-7-97308 (JP, A) JP-A-6-128337 (JP) JP-A-5-246828 (JP, A) JP-A-4-21623 (JP, A) JP-A-5-97636 (JP, A) JP-A-5-502891 (JP, A) JP-A-5-502891 6-508158 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A61K 7/06 A61K 7/00

Claims (3)

(57) [Claims] (A) General formula (I): (Wherein R ¹ represents a hydrogen atom or a methyl group) (A) 10-45% by weight of (A) acrylic acid (B) General formula (II): (Wherein X is an imino group or an oxygen atom, R ¹ is a hydrogen atom or a methyl group, R ² is an alkylene group having 1 to 3 carbon atoms,
R ³ , R ⁴ , R ⁵ and R ⁶ each independently represent a methyl group or an ethyl group).
(C) general formula (III): (Wherein, R ¹ is a hydrogen atom or a methyl group, R ⁷ is a carbon atom 2
(Indicating an alkyl group of 1 to 8) (C-
1) or the monomer (C-1) and the general formula (IV): (Wherein, R ¹ is a hydrogen atom or a methyl group, R ⁸ is a carbon atom 1
(Indicating an alkyl group of 18 to 18) (C
35% to 85% by weight of a monomer (C) which is -2), and (D) a general formula (V): (Wherein, R ¹ is a hydrogen atom or a methyl group, R ⁹ is a methyl group or an ethyl group, and n is an integer of 1 to 23). An aerosol hairdressing base comprising a copolymer obtained by polymerization. 2. A monomer component comprising 1 to 30% by weight of an ethylenically unsaturated monomer (E) copolymerizable with (meth) acrylic acid (A), monomer (B), monomer (C) and monomer (D). The base for an aerosol hairdressing composition according to claim 1, which is contained. 3. The base for an aerosol hairdressing composition according to claim 1, wherein the neutralization ratio of carboxyl groups in the copolymer is 40 to 95 mol%.