JP2938326B2 - 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 hairdressing base. More specifically, it is soluble in water and hydrophilic organic solvents, has excellent compatibility with aerosol propellants, imparts excellent combability, gloss and supple feel to hair, and has good setting power. The present invention relates to a cationic hairdressing base exhibiting the following.

[0002]

2. Description of the Related Art Conventionally, hair styling agents have a degree of polymerization of 1 to 5 such as volatile cyclic polysiloxane and dimethyl polysiloxane.
Polysiloxane with a low degree of polymerization of about 0 is used because of its good compatibility with other raw materials, but recently, the combability of silicone oil is improved as the degree of polymerization of the silicone oil increases. Is recognized,
Expectations for silicone oils with a high degree of polymerization are increasing.

[0003] However, the silicone oil has a drawback that when the degree of polymerization exceeds about 50, the compatibility with other raw materials such as alcohol becomes poor and the silicone oil is easily separated.

[0004] Therefore, various types of silicone oils have been improved, and attempts have been made to improve water solubility and adhesion to hair by modifying the functional groups thereof. Such techniques include, for example, polyether-modified silicones (JP-A-60-126209, JP-A-61-164209).
No. 6) or amino-modified silicone (JP-A-1-203)
314, JP-A-2-111712) are known.

[0005] However, these silicones are all based on silicone oil, and have various characteristics when used as a hair styling agent while having characteristics unique to silicone. For example, if the film is modified to increase its hardness, impart water solubility, or improve adhesion to hair, it tends to be expensive, and a low molecular weight silicone oil is used for hair spray. When blended with hair styling products such as hair, mousse, gel, etc., part of the hair elutes after use on the hair. There are drawbacks such as increased feeling and greasy.

[0006] In order to facilitate setting of the hair and maintain the set hairstyle, resins such as anionic and cationic resins are used. However, the hair styling agent using these resins causes the hair to be hard,
The disadvantage is that the resin on the hair peels off, causing a flaking phenomenon that appears like dandruff, and the detergency is poor when used repeatedly, so it accumulates on the hair and loses the desired luster and smoothness. is there.

[0007]

SUMMARY OF THE INVENTION Accordingly, the present inventors
In view of the prior art, stably dissolve or disperse in an extremely wide range of solvents from aqueous solvents to non-aqueous hydrocarbon organic solvents, imparting an excellent fixing setting force and excellent flexibility to hair, In addition, as a result of intensive studies to develop a base for hairdressing agents that can impart excellent gloss, excellent smoothness and excellent combability to hair, which are the characteristics of silicone oil, hairdressing that satisfies these properties at the same time Finally, the present inventors have found an agent base and completed the present invention.

[0008]

That is, the present invention provides a compound represented by the general formula (I):

[0009]

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(Wherein R ¹ is a hydrogen atom or a methyl group,
R ² represents an alkyl group having 1 to 4 carbon atoms) 30 to 70% by weight of a monomer (A) represented by the following general formula (II):

[0011]

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(Wherein, R ¹ is the same as above, and X is —NH—
A group or an oxygen atom, R ³ and R ⁴ each independently represent a methyl group or an ethyl group, and n represents 2 or 3) 20 to 50% by weight of a monomer (B) represented by the general formula (I
II):

[0013]

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(Wherein R ¹ is as defined above) 0.1 to 10% by weight of a monomer (C) represented by the general formula (IV):

[0015]

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The present invention relates to a hairdressing base obtained by polymerizing a monomer component containing 1 to 20% by weight of a monomer (D) represented by the formula (wherein R ¹ is the same as described above).

[0017]

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

[0018]

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(Wherein R ¹ is a hydrogen atom or a methyl group,
R ² represents an alkyl group having 1 to 4 carbon atoms) 30 to 70% by weight of a monomer (A) represented by the following general formula (II):

[0020]

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(Wherein, R ¹ is the same as above, and X is —NH—
A group or an oxygen atom, R ³ and R ⁴ each independently represent a methyl group or an ethyl group, and n represents 2 or 3) 20 to 50% by weight of a monomer (B) represented by the general formula (I
II):

[0022]

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(Wherein R ¹ is as defined above) 0.1 to 10% by weight of a monomer (C) represented by the following general formula (IV):

[0024]

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(Wherein R ¹ is the same as described above) is obtained by polymerizing a monomer component containing 1 to 20% by weight of a monomer (D) represented by the following formula:

The monomer (A) used in the present invention is, as described above, a (meth) acrylate of ethylene glycol monoalkyl ether represented by the general formula (I).

The use of the monomer (A) is a major feature of the present invention. When the monomer (A) is used in combination with a monomer having a siloxy group, the monomer (A) has an excellent phase with respect to water and a hydrophilic solvent. A soluble film is formed, and on the hair, a moderately wettable and flexible film is formed, the stiffness, the blocking phenomenon and the flaking phenomenon are suppressed, and the setting power is improved.

Specific examples of the monomer (A) include, for example, methoxyethyl (meth) acrylate, ethoxyethyl (meth) acrylate and the like. These monomers are used alone or as a mixture of two or more.

The amount of the monomer (A) used is from 30 to 70% by weight, preferably from 35 to 60% by weight, more preferably from 40 to 55% by weight, based on the monomer component to be subjected to the polymerization.
% By weight. When the amount of the monomer (A) used is less than 30% by weight, the dispersibility of the obtained hair styling preparation base in water is reduced, and precipitation and coagulation and sedimentation occur when used as an aqueous solution. If the film formed by the obtained hairdressing preparation base loses wettability and flexibility, it may have a stiff feeling or a flaking phenomenon. The moisture resistance of the film formed by the base for formulation decreases, and the setting force decreases.

As described above, the monomer (B) used in the present invention is a monomer composed of a derivative of (meth) acrylic acid or (meth) acrylamide containing an amino group represented by the general formula (II).

In the present invention, there is another great feature in using the monomer (B). Monomer (B)
Imparts water solubility and detergency to the obtained hairdressing base,
Moreover, it is a component that gives excellent adhesion to hair.

Specific examples of the monomer (B) include, for example, 2-dimethylaminoethyl (meth) acrylate, 2-diethylaminoethyl (meth) acrylate,
3-dimethylaminopropyl (meth) acrylamide,
2-dimethylaminopropyl (meth) acrylate, 2
-Diethylaminopropyl (meth) acrylate, 2-
Examples thereof include dimethylaminoethyl (meth) acrylamide and 3-diethylaminopropyl (meth) acrylamide, and these monomers are used alone or in combination of two or more.

The amount of the monomer (B) is from 20 to 50% by weight, preferably from 30 to 48% by weight, more preferably from 35 to 45% by weight, based on the monomer component to be subjected to polymerization.
% By weight. When the amount of the monomer (B) used is less than 20% by weight, the water solubility of the obtained hair styling preparation base decreases, and when it is used as an aqueous solution, precipitation and coagulation sedimentation may occur. In addition, it is difficult to remove the hair from the obtained hairdressing base, and if the amount exceeds 50% by weight, the moisture resistance of the film formed by the obtained hairdressing base is reduced, and stickiness may occur. , And the set force is reduced.

The monomer (C) used in the present invention is a siloxy group-containing (meth) acrylic acid derivative represented by the general formula (III).

In the present invention, the use of the monomer (C) has another significant feature. The monomer (C) has the property of improving the smoothness and the setting power while giving the obtained base for a shampoo an excellent luster, which is a characteristic of silicone oil. Also, unlike the conventional silicone oil blend, the siloxy group is fixed as a single polymer chain in the hairdressing base, so that part of the silicone oil is eluted. There is no squeaky feeling or greasy feeling on the hair even after long use.

Specific examples of the monomer (C) include acryloxypropyltris (trimethylsiloxy) silane and methacryloxypropyltris (trimethylsiloxy) silane, and these monomers may be used alone or as a mixture.

The amount of the monomer (C) used is from 0.1 to 10% by weight, preferably from 0.5 to 5% by weight, more preferably from 1 to 3% by weight, based on the monomer component to be subjected to the polymerization. is there. When the amount of the monomer (C) is less than 0.1% by weight, smoothness such as silicone oil is not provided, gloss is not recognized, and when the amount exceeds 10% by weight, However, since the hardness of a film formed using the obtained base for hairdressing preparations is reduced and silicone rubber-like properties begin to appear, the hair may become white when applied to hair by means such as spraying.

The monomer (D) used in the present invention is an acrylic acid or a methacrylic acid represented by the general formula (IV), which increases the hydrogen bonding force between the obtained hairdressing base and the hair, It is a component that enhances set power.

The amount of the monomer (D) is from 1 to 20% by weight, preferably from 2 to 15% by weight, more preferably from 4 to 13% by weight, based on the monomer component to be subjected to polymerization.
It is. When the amount of the monomer (D) is less than 1% by weight, the adhesiveness to hair is reduced, a flaking phenomenon occurs, the setting force is reduced, and 20% by weight.
When the amount exceeds the above range, the film formed by the obtained base for a hairdressing agent becomes hard, causing a stiff feeling and a flaking phenomenon.

In the present invention, the film formed by the obtained hairdressing base is imparted with flexibility and moderate hardness, changes the feel, and when used in the form of an aerosol, for example, the aerosol propellant Alternatively, an ethylenically unsaturated monomer (E) may be used, if necessary, to further improve the compatibility with the hydrophilic solvent used in the aerosol.

Specific examples of the ethylenically unsaturated monomer (E) include, for example, 2-ethylhexyl acrylate, dodecyl acrylate, tridecyl acrylate,
Stearyl acrylate, cyclohexyl acrylate, 2-ethylhexyl methacrylate, dodecyl methacrylate, tridecyl methacrylate, stearyl methacrylate, cyclohexyl methacrylate, N-tert-octyl (meth) acrylamide, tert-butyl (meth) acrylamide, n-propyl (meth) acrylate, Isopropyl (meth) acrylate, n-butyl (meth) acrylate, tertiary butyl (meth) acrylate, acrylonitrile, styrene, methylstyrene, chlorostyrene, vinyltoluene, vinylpyrrolidone, vinyl acetate, methyl vinyl ether, (meth) acrylamide, hydroxy Ethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxybutyl (Meth) acrylate, polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, diacetone acrylamide, ethyl (meth) acrylate,
Methyl (meth) acrylate and the like can be mentioned, and these monomers can be used alone or in combination of two or more.

The amount of the ethylenically unsaturated monomer (E) to be used may be adjusted in accordance with the desired physical properties of the base for a hairdressing agent.
When the amount is less than 20% by weight, it is difficult to impart desired physical properties to the base for a hairdressing agent, and when the amount exceeds 20% by weight, the base is formed using the obtained base for a hairdressing agent. Since blocking may occur in the film or the smoothness and transparency of the film may be deteriorated, the content is preferably in the range of 1 to 20% by weight, especially 5 to 15% by weight.

The base for a hairdressing composition of the present invention is obtained by adjusting the desired amount of the monomers (A) to (D) and, if necessary, the monomer (E) and copolymerizing the same in a hydrophilic solvent.

Here, the hydrophilic solvent is an organic solvent having a solubility in water of 10 g / 100 g of water (25 ° C.) or more. Specific examples of such a hydrophilic solvent include, for example, aliphatic C1 to C4 aliphatic alcohols, ethyl cellosolve, butyl cellosolve, dioxane, methyl acetate,
Dimethylformamide and the like can be mentioned, and among them, aliphatic monohydric alcohol is particularly preferable in handling as a cosmetic raw material.

Specific examples of the aliphatic monohydric alcohol include, for example, methanol, ethanol, isopropanol and the like. Specific examples of the aliphatic dihydric alcohol include, for example, propylene glycol.

In addition, the base for a hairdressing composition of the present invention may adhere to the skin of the human body.
Among the hydrophilic solvents, ethanol and isopropanol are particularly preferred.

In the polymerization, a monomer component comprising the monomers (A) to (D) and, if necessary, an ethylenically unsaturated monomer (E) is dissolved in the hydrophilic solvent, and a polymerization initiator is added. This is performed by stirring while heating in an inert gas stream such as a raw gas.

The polymerization initiator is not particularly limited as long as it is generally used in a solution polymerization method. Specific examples thereof include peroxides such as benzoyl peroxide and lauroyl peroxide, azobis Examples include azo compounds such as isobutyronitrile. When an acrylate-based monomer is selected from monomers to be subjected to polymerization, an azo-based compound may be used because a cross-linking gelation may occur when a peroxide is used as a polymerization initiator. preferable.

In the polymerization, the hydrophilic solvent is preferably used by adjusting the concentration of the monomer component to about 30 to 70% by weight. When the concentration of the monomer component is more than 50% by weight, the polymerization is carried out by dividing and gradually adding the monomer component to avoid rapid generation of polymerization heat and to carry out the polymerization safely. Is preferred.

The polymerization temperature depends on the type of the 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 polymerization with higher reproducibility can be performed.

If the polymerization time is shorter than 8 hours, the polymerization may be incomplete and unreacted monomers may remain, so that the polymerization time is 8 hours or more, preferably 12 to 36 hours.
It is desirable to set it to about time.

It should be noted that whether or not the residual monomer exists is determined by
It can be confirmed by confirming whether or not a double bond exists by a general method, for example, the PSDB method.

The base for a hairdressing composition of the present invention thus obtained is one in which the copolymer has a weight-average molecular weight of about 10,000 to 150,000 and can be used usually as it is or after removing the solvent. However, in order to further impart water solubility, it is preferable to neutralize the base for hair styling by adding, for example, a water-soluble acidic substance. In this case, the neutralization ratio is preferably from 40 to 90 mol%, more preferably from 60 to 80 mol%. When the neutralization ratio is less than 40 mol%, the water solubility tends to decrease, and the detergency tends to decrease. When the neutralization ratio exceeds 90 mol%, the obtained hair dressing base is obtained. There is a tendency that the water resistance of the film formed by using the method is reduced.

Examples of the water-soluble acidic substance include hydrochloric acid, sulfuric acid, acetic acid, lactic acid, succinic acid, tartaric acid, citric acid,
Phosphoric acid, malonic acid, aspartic acid and the like can be mentioned, and these compounds are usually used alone or in combination of two or more.

When the hairdressing preparation base of the present invention is used as an aerosol, the hairdressing preparation base dissolved in, for example, the hydrophilic solvent used as the polymerization solvent is mixed with natural gas. A propellant for aerosol such as dimethyl ether, other additives, auxiliary agents and the like may be filled under pressure into an aerosol container and sealed. In this case, it is desirable that the mixing ratio of the various components to be filled in the aerosol container is appropriately adjusted in general according to the intended use.

Next, the base for a 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 500 ml five-necked flask equipped with a reflux condenser, a thermometer, a nitrogen gas inlet tube, a dropping funnel and a stirrer was charged with 55 parts of ethoxyethyl methacrylate (parts by weight, hereinafter the same). Dimethylaminoethyl methacrylate 3
5 parts, 1 part of methacryloxypropyltris (trimethylsiloxy) silane, 9 parts of methacrylic acid and 100 parts of ethanol were added, and 0.3 part of α, α′-azobisisobutyronitrile was added thereto. The mixture was heated and refluxed at 80 ° C. in a stream of air. 6 hours after the start of polymerization, α, α
0.3 parts of '-azobisisobutyronitrile was added thereto, and the mixture was further polymerized for 6 hours to complete the reaction.

The obtained resin composition was cooled to 50 ° C. or less, and 32.1 parts of a 50% by weight ethanol solution of lactic acid was added to adjust the amino group neutralization rate to 80 mol%.

The resin solid content of the obtained hairdressing preparation base is 50
% By weight, and the resin had a weight average molecular weight of 72,000.

The physical properties of the obtained hairdressing preparation base were appearance, water solubility, compatibility with ethanol, and a propellant (mixed gas of 70 parts of liquefied petroleum gas and 30 parts of dimethyl ether: hereinafter referred to as LPG / DME). Was examined according to the following method. Table 1 shows the results.

(A) Appearance The appearance (color tone) of the hairdressing preparation base was visually observed.

(B) Water-solubility To 5 g of a 50% by weight ethanol solution of a hair styling base was added 45 parts of water.
g was added and evaluated based on the following evaluation criteria.

(Evaluation Criteria) ：: Completely dissolved within 5 minutes. Δ: Dissolves completely within 15 minutes. X: Turbidity occurs.

(C) Compatibility with ethanol To 5 g of a 50% by weight ethanol solution of a base material for a hairdressing agent, 245 g of ethanol was added while maintaining the solution temperature at 5 to 10 ° C., and the change in the dilution state was evaluated according to the following evaluation criteria. Was evaluated based on

(Evaluation Criteria) ：: Uniform dilution. Δ: Turbidity occurs when ethanol is added. ×: Polymer is coagulated and precipitated when ethanol is added.

(D) Compatibility with propellant A 10 g ethanol solution of a hair styling base having a resin solid content of 10% by weight was added to a pressure-resistant glass container having a filling valve for liquefied petroleum gas (full filling amount: 100 ml). Thereafter, LPG / DME as a propellant was filled into the glass container at a pressure of 4 kg / cm ² , and the amount of LPG / DME used when clouding occurred on the inner wall of the glass container at room temperature (25 ° C.) was measured. The compatibility (limit value%) with the propellant was determined based on the following formula.

[0067]

(Equation 1)

[0068]

[Table 1]

Examples 2 to 18 and Comparative Examples 1 and 2
A hair dressing base was obtained in the same manner as in Example 1, except that the amount of the ethanol solution by weight and the neutralization rate were changed as shown in Table 2. However, in Comparative Example 2, 41.4 parts of a 50% by weight ethanol solution of 2-aminomethylpropanol, which is a basic substance, was used in place of the ethanol solution of lactic acid.

[0070]

[Table 2]

The weight average molecular weight and physical properties of the obtained hairdressing preparation base were examined in the same manner as in Example 1. Table 1 shows the results.

Each abbreviation in the table means the following components.

ETMA: ethoxyethyl methacrylate MTMA: methoxyethyl methacrylate MNEN: methoxynonaethylene glycol methacrylate MTA: methoxyethyl acrylate DM: 2-dimethylaminoethyl methacrylate DMA: 2-dimethylaminoethyl acrylate DMAPAA: 3-dimethylaminopropyl acrylamide DMAPMA : 3-dimethylaminopropyl methacrylamide MPTMS: methacryloxypropyl tris (trimethylsiloxy) silane MAA: methacrylic acid AA: acrylic acid TBM: tertiary butyl methacrylate LM: lauryl methacrylate SM: stearyl methacrylate TBA: tertiary butyl acrylate LA: lauryl Acrylate SA Stearyl acrylate DAAm: diacetone acrylamide NOAM: N-tertiary-octyl acrylamide TBAA: tertiary-butylacrylamide From the results shown in Table 1, the bases for hairdressing preparations obtained in Examples 1 to 18 each have the appearance and appearance. It can be seen that the compound is excellent in water solubility, compatibility with ethanol, and compatibility with the propellant. Therefore, the hair styling agent to which the base for a hair styling agent of the present invention is applied has an advantage that it can be spouted out of a spray container or an aerosol container in a homogeneous state.

Formulation Examples 1 to 18 and Comparative Formulation Examples 1 to 4 10 g of an ethanol solution containing 10% by weight of the resin component of the hairdressing preparation base obtained in Examples 1 to 18 and Comparative Examples 1 to 2 and injection An aerosol container (full injection amount: 100 ml) was filled with 10 g of LPG / DME as an agent, and a valve was attached thereto to produce an aerosol product for a hairdressing agent.

Further, methyl polysiloxane (n = 10) (manufactured by Nippon Unicar Co., Ltd.) was used based on the solid content of the hairdressing preparation base (solid content: 50% by weight) obtained in Comparative Examples 1 and 2.
-45) 5 parts were added, and 10 g of an ethanol solution adjusted to a solid content of 10% by weight with ethanol was used, and an aerosol product for a hair styling agent was prepared in the same manner as described above (Comparative prescription example). 3, 4).

Using the obtained aerosol product, the physical properties of the hair styling agent and the physical properties of the film were examined according to the following methods. Table 3 shows the results.

Physical properties of the hairdressing agent (a) Setting force After spraying the hairdressing agent onto 2 g of hair having a length of 25 cm from a distance of 20 cm for 10 seconds, the hair was wound around a curler having an outer diameter of 1.2 cm, and heated at 40 ° C. After drying in the wind for 60 minutes, remove the hair from the curlers, temperature 30 ℃,
The length (L ₁ cm) immediately after hanging vertically in an atmosphere with a relative humidity of 90% and the length after standing for 1 hour (L ₂ cm) were measured, and the curl retention was determined by the following formula:

[0078]

(Equation 2)

Calculated from

In addition, those having a curl retention of 60% or more were regarded as passing (indicated by A in the table), and those having less than 60% were rejected (indicated by B in the table).

(B) Suppleness After spraying a hairdressing agent onto 2 g of hair 25 cm in length from a distance of 20 cm for 10 seconds, the hairs are lined up with a commercially available comb before drying, and the hair is heated with 40 ° C. warm air for 60 minutes. After the drying, the evaluation was performed according to the following evaluation criteria.

(Evaluation Criteria) A: There is no stiffness when touched by hand, and it is supple. B: There is slight stiffness when touched by hand. C: When touched by hand, stiffness is severe and there is a feeling of creaking.

(C) Combability A hair styling agent was sprayed onto 2 g of hair having a length of 25 cm from a distance of 20 cm for 10 seconds. 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: Although it is caught, it can pass through the comb. C: It is hard to catch and it is hard to pass through the comb. D: Comb does not pass.

(D) Gloss A hair styling agent was sprayed on 2 g of hair having a length of 25 cm from a distance of 20 cm for 10 seconds.

The hair was dried with warm air at 40 ° C. for 60 minutes, and the gloss was visually observed.

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

(E) Sensation over time A hairdressing agent was sprayed on 2 g of hair having a length of 25 cm from a distance of 20 cm for 10 seconds.

The hair was dried with warm air at 40 ° C. for 60 minutes, and the difference in feel between immediately after drying and after 12 hours was observed by applying pressure with a finger.

(Evaluation Criteria) A: No change after 12 hours. B: There is some stickiness after 12 hours. C: Sticky after 12 hours.

Physical Properties of Film (a) Detergency A hair styling agent was placed on a glass plate 2.5 cm long and 7.5 cm wide.
After spraying from a distance of 5 cm for 5 seconds, the film was air-dried at 20 ° C. for 3 hours to form a film. The glass plate was immersed in warm water containing 0.2% shampoo at 40 ° C., and the change with time in the dissolved state of the film was examined. The evaluation was performed according to the following evaluation criteria.

(Evaluation Criteria) A: Completely dissolved within 20 minutes. B: Dissolve completely within 40 minutes. C: The film remains even after 40 minutes.

(B) Smoothness A hair styling agent was placed on a glass plate 2.5 cm long and 7.5 cm wide.
After spraying from a distance of 5 cm for 5 seconds, the film was air-dried at 20 ° C. for 3 hours to form a film. Next, the tactile sensation 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: There is some roughness. C: There is considerable roughness.

(C) Transparency The hair styling agent was sprayed onto a glass plate of 2.5 cm in length and 7.5 cm in width from a distance of 20 cm for 5 seconds.
Air dried for 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.

[0097]

[Table 3]

From the results shown in Table 3, Formulation Examples 1 to 18
It can be seen that the obtained hair dressings are all excellent in the physical properties of the hair dressing and the physical properties of the film.

[0099]

The base for a hairdressing composition of the present invention is soluble in water and a hydrophilic organic solvent, and has excellent compatibility with LPG / DME used as an aerosol propellant. It can be ejected in a homogeneous state from a container or an aerosol container.

Further, the base for a hairdressing composition of the present invention exhibits a cationic property and therefore has an excellent affinity for hair.

Further, the base for a hairdressing composition of the present invention has excellent setting power, suppleness, combability, gloss,
It imparts various properties such as sensation over time, detergency, smoothness, and transparency.

Claims (3)

(57) [Claims] 1. A compound of the general formula (I): (Wherein R ¹ represents a hydrogen atom or a methyl group, and R ² represents an alkyl group having 1 to 4 carbon atoms) 30 to 70% by weight of a monomer (A) represented by the following general formula (II): Wherein R ¹ is the same as above, X is an —NH— group or an oxygen atom, R ³ and R ⁴ are each independently a methyl or ethyl group, and n is 2 or 3. B) 20 to 50% by weight, general formula (III): (Wherein R ¹ is the same as described above) 0.1 to 10% by weight of a monomer (C) represented by the following general formula (IV): (Wherein R ¹ is the same as described above). A hairdressing preparation base obtained by polymerizing a monomer component containing 1 to 20% by weight of a monomer (D) represented by the following formula: 2. The hairdressing composition according to claim 1, wherein the monomer component contains a copolymerizable ethylenically unsaturated monomer (E) in a range of 1 to 20% by weight. 3. The neutralization ratio of amino groups in the copolymer is from 40 to 40.
The base for a hairdressing composition according to claim 1 or 2, which is 90 mol%.