JPH10306016A - Water-based manicure and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a water-based manicure having excellent gloss, adhesivity, scratch resistance, feeling and water-resistance by including an aqueous emulsion containing a self-emulsifiable vinyl polymer and a cellulose derivative. SOLUTION: This manicure contains (A) 100 pts.wt. of a self-emulsifiable vinyl polymer preferably having a glass transition temperature of -10 to +70 deg.C [e.g. a copolymer of a non-functional monomer for emulsification (e.g. an acrylate) and a functional monomer (e.g. vinylpyridine)] and (B) 10-200 pts.wt. of a cellulose derivative preferably having a weight-average molecular weight of 10,000-200,000 (e.g. acetyl cellulose). The objective manicure preferably has a solid concentration of >=20 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aqueous nail varnish, and more particularly to an aqueous nail varnish which does not contain a low-boiling organic solvent and which is used in conventional nail varnishes. It relates to an aqueous nail polish having excellent properties and the like. The nail polish in the present invention includes a nail enamel, a nail enamel base coat, a nail enamel overcoat, and the like.

[0002]

2. Description of the Related Art Nail polish such as a nail enamel, a nail enamel base coat and a nail enamel overcoat can be applied to nails and limbs to protect the limbs and nails, and can be applied to nails and polishes. It is used for the purpose of giving beautiful decorations and coloring beautifully. As the above-mentioned nail polish, an organic solvent solution type using a nitrocellulose, an alkyd resin or the like as a film-forming material is currently mainstream. The above-mentioned organic solvent solution type nail polish has a high drying rate and excellent nail coating performance, but uses an organic solvent, so there is a high risk of ignition and burning, and absorption and evaporative gas suction from nails. There are problems such as adverse effects on the human body. It is considered that all of these serious problems can be solved by changing the medium from an organic solvent to water. Based on this idea, various aqueous nail varnishes without using an organic solvent have been proposed in recent years. As such aqueous nail varnishes, for example, Japanese Patent Application Laid-Open No. 54-28836 and Japanese Patent Publication No. 55-43445 disclose nail polishes based on acrylic polymer emulsions.
JP-A-6-131513 and JP-A-57-56410 disclose a nail polish based on a microemulsion of an acrylic polymer.

[0003] Since the aqueous nail varnish disclosed in the above publication does not contain an organic solvent, the problem of the above-mentioned adverse effects on the human body due to absorption from nails and suction of vaporized gas is solved. However, since the aqueous nail polish disclosed in the above publication uses a polymer emulsion produced by emulsion polymerization using an emulsifier or a water-soluble polymer, a small amount of film is formed so as not to lose the characteristics of an aqueous nail polish. With the use of the auxiliary agent, it has been difficult to give a hard and hard film that can sufficiently withstand use. Further, the film obtained by the aqueous nail varnish disclosed in the above publication has poor water resistance, and thus has a disadvantage that it is easily peeled off during use in daily life, and cannot be said to be sufficiently practical. In order to solve the above problem, Japanese Patent Application Laid-Open No. 4-103513 proposes an aqueous nail varnish using a mixture of two or more acrylic polymer emulsions having a difference in glass transition temperature of 10 ° C. or more. This aqueous nail varnish is somewhat improved in gloss, adhesion, water resistance and coating strength as compared with an aqueous nail varnish using a mere acrylic polymer emulsion, but an aqueous nail varnish with further improved coating performance is obtained. Is desired. Therefore, the object of the present invention is to
An object of the present invention is to provide an aqueous nail varnish having excellent gloss, adhesion, scratch resistance, tactile sensation and water resistance.

[0004]

Means for Solving the Problems As a result of extensive studies, the present inventors have found that by using an aqueous emulsion containing a specific polymer and a cellulose derivative as an aqueous nail polish,
It has been found that the above object can be achieved. The present invention has been made based on the above findings, and provides an aqueous nail varnish comprising an aqueous emulsion containing a self-emulsifiable vinyl polymer and a cellulose derivative. Further, the present invention provides a method for producing an aqueous nail varnish, comprising dispersing an organic solvent solution containing a self-emulsifiable vinyl polymer and a cellulose derivative in water, and then removing the organic solvent. is there.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION First, the aqueous nail polish of the present invention will be described in detail. The aqueous nail polish of the present invention contains an aqueous emulsion containing a self-emulsifiable vinyl polymer and a cellulose derivative. In addition, in this specification, "self-emulsifiable" means that emulsification is possible even in the absence of an emulsifier. In this specification,
"Aqueous" means that the polymer is dispersed in water. The self-emulsifiable vinyl polymer contained in the aqueous emulsion includes a vinyl monomer having no strong hydrophilic side chain that contributes to emulsification (hereinafter, referred to as a “non-functional monomer”) and a emulsification. It is preferable to use a polymer obtained by copolymerization with a vinyl monomer having a strongly hydrophilic side chain (hereinafter, referred to as “functional monomer”). Examples of the non-functional monomer include (meth) acrylates (acrylates), vinyl esters, and vinyl ethers. As the (meth) acrylate, for example, the alkyl group has 1 to 1 carbon atoms.
Preferred are 12 (preferably 1 to 8) alkyl (meth) acrylates, specifically, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate and octyl ( (Meth) acrylate and the like. As the vinyl ester, for example, a vinyl ester of a carboxylic acid having 2 to 14 (preferably 3 to 12) carbon atoms is preferable, and specific examples thereof include vinyl acetate, vinyl propionate, vinyl caprate and vinyl versatate. No. As the vinyl ether, for example, an alkyl vinyl ether having an alkyl group having 1 to 12 (preferably 1 to 8) carbon atoms is preferable, and specific examples include methyl vinyl ether, ethyl vinyl ether, propyl vinyl ether, and butyl vinyl ether. Other non-functional monomers include, for example, styrene, acrylonitrile, methacrylonitrile, vinyl chloride, vinylidene chloride, dibutyl maleate and dioctyl maleate. In order to obtain the self-emulsifiable vinyl polymer, the non-functional monomer may be used alone or in combination of two or more.

As the above-mentioned functional monomer, any of anionic functional monomers, nonionic functional monomers and cationic functional monomers can be used.
As the anionic functional monomer, a monomer having a carboxyl group or a sulfonic acid group in the molecule or a salt thereof can be used. Examples of the monomer having a carboxyl group in the molecule include, for example, those having 3 to 12 carbon atoms.
(Preferably 3 to 8) unsaturated carboxylic acids or salts thereof are preferable, and specific examples thereof include (meth) acrylic acid, fumaric acid, maleic acid, and itaconic acid, and salts thereof. As the monomer having a sulfonic acid group in the molecule, an unsaturated sulfonic acid having 3 to 12 (preferably 3 to 8) carbon atoms or a salt thereof is preferable. Specifically, styrene sulfonic acid, allyl sulfonic acid, sulfo Propyl acrylate and sulfopropyl methacrylate and salts thereof. As the cationic functional monomer, for example, a monomer having a vinyl group in the molecule is preferable. Specifically, N, N′-dimethylaminoethyl (meth) acrylate, N, N′-dimethylaminopropyl ( (Meth) acrylamide, vinylpyridine and N, N'-dimethylaminomethylstyrene. Examples of the nonionic functional monomer include acrylamide, hydroxyethyl acrylate, hydroxyethyl methacrylate, various polyethylene glycol methacrylates having different ethylene oxide chain lengths, and acrylates. In order to obtain the above-mentioned self-emulsifiable vinyl polymer, the above-mentioned functional monomers may be used alone or in combination of two or more.

[0007] The vinyl polymer obtained by copolymerization of the non-functional monomer and the functional monomer is capable of self-emulsification. The self-emulsifiability of the polymer is governed by the copolymerization rate of the functional monomer.
However, since the self-emulsifiability is affected by the self-emulsifiability of the functional monomer, the hydrophobic level of the non-functional monomer, the molecular weight of the obtained polymer, etc., it is not possible to uniformly define the required copolymerization rate. Although it is difficult, as a rough guide, the molar copolymerization ratio of the functional monomer is preferably in the range of 1 to 30%, more preferably 3 to 10%. If the molar copolymerization ratio of the functional monomer exceeds 30%, the water resistance of the nail polish coating film may decrease, so that it is preferably within the above range. The glass transition temperature (Tg) of the self-emulsifiable vinyl polymer is preferably from -10 to 70 ° C, more preferably from 5 to 70 ° C.
60 ° C. The glass transition temperature increases when a cellulose derivative is added to the self-emulsifiable vinyl polymer, and the glass transition temperature decreases when a plasticizer is added. The glass transition temperature of the aqueous nail varnish of the present invention can be controlled by the glass transition temperature of the self-emulsifiable vinyl polymer and the amount of the cellulose derivative and the plasticizer to be added. If the glass transition temperature of the system polymer is lower than the above range, the abrasion resistance and tactile sensation of the obtained aqueous nail varnish may decrease, and when the glass transition temperature exceeds the above range,
Since the adhesiveness and gloss of the obtained aqueous nail varnish may decrease, it is preferable to be within the above range. The glass transition temperature (° K) of the copolymerized vinyl polymer is
It is determined by the following equation. 1 / Tg = w ₁ / Tg ₁ + w ₂ / Tg ₂ + w ₃ / Tg ₃ + {w ₁ , w ₂ , w ₃ }: weight fraction of each component monomer Tg ₁ , Tg ₂ , Tg ₃ ───: Glass transition temperature of homopolymer from each component monomer

[0008] The self-emulsifiable vinyl polymer is
It can be produced by ordinary solution polymerization. This is because it is desirable to include a high proportion of hydrophilic functional monomers and to obtain the polymer in an organic solvent solution. As the organic solvent, those having a boiling point of 120 ° C. or less are suitable in consideration of the ease of removing the solvent later. Examples of the organic solvent having a boiling point of 120 ° C. or lower include acetone, methyl ethyl ketone, ethyl alcohol, propyl alcohol, benzene, toluene, ethyl acetate, and propyl acetate. In the present invention, a self-emulsifiable vinyl polymer may be used alone, or two or more vinyl polymers may be used in combination.

As the cellulose derivative contained in the aqueous emulsion, it is preferable to use an esterified product of cellulose such as a diester or triester derivative of cellulose. The cellulose derivative is preferably soluble in the above-described organic solvent.Examples of such a cellulose derivative include acetyl cellulose, cellulose propionate, cellulose butyrate, cellulose acetate butyrate, nitrocellulose, cellulose nitrate acetate, Cellulose sulfate, cellulose phosphate and the like can be mentioned, and among these, it is preferable to use mass-produced nitrocellulose, acetylcellulose and cellulose acetate butyrate from the viewpoint of easy availability. In the present invention,
The above cellulose derivatives may be used alone or in combination of two or more. The cellulose derivative has a weight average molecular weight of 10,000 to 200,
000 is preferable, and 20,000 to 100,00
0 is more preferred. When the weight average molecular weight is less than the above range, the effect of improving the mechanical strength of the nail polish coating film may be small, and when the weight average molecular weight exceeds the above range, the viscosity of the obtained nail polish may increase and it may be difficult to handle. , Within the above range. The cellulose derivative is preferably contained in an amount of 10 to 200 parts by weight, more preferably 20 to 100 parts by weight, based on 100 parts by weight of the self-emulsifiable vinyl polymer. When the content is less than 10 parts by weight, the effect of improving the mechanical strength of the nail polish coating film is poor,
If the amount exceeds 200 parts by weight, the amount of the film-forming aid and / or the plasticizer required to enable film formation may be extremely large, so that the content is preferably within the above range.

In order to add the cellulose derivative to the self-emulsifiable vinyl polymer, the cellulose derivative may be directly dissolved in the self-emulsifiable vinyl polymer solution or an organic solvent solution of the cellulose derivative. May be added to the self-emulsifiable vinyl polymer solution. In addition, during the solution polymerization of the self-emulsifiable vinyl polymer, the cellulose derivative may be allowed to coexist. As described above, when the above-mentioned cellulose derivative coexists during the solution polymerization, a vinyl-based monomer capable of self-emulsification is graft-polymerized to a part of the cellulose derivative in the course of polymerization to form a self-emulsifiable vinyl-based polymer with the cellulose derivative. Significantly improves the compatibility. The aqueous nail polish of the present invention preferably has a solid content concentration of 20% by weight or more, more preferably 30% by weight or more. In addition, the aqueous nail varnish of the present invention can be produced by the method for producing an aqueous nail varnish of the present invention described later.

The aqueous nail varnish of the present invention may contain a plasticizer and a film-forming auxiliary which are usually used for nail varnish. While the plasticizer plasticizes the polymer almost permanently, the film-forming auxiliary functions as a plasticizer only at the time of film formation, and is quickly released from the system after the film formation. Examples of the plasticizer include dibutyl phthalate, di-2-ethylhexyl phthalate, di-n-octyl phthalate, diisodecyl phthalate, diisononyl phthalate, butyl benzyl phthalate, dibutyl adipate, di-2-ethylhexyl adipate, dibutyl glycol adipate, dibutyl Sebacate and J
2-ethylhexyl sebacate and the like. The plasticizer stays in the nail polish coating almost permanently and plasticizes it, so its role is basically the same as the internal plasticizing monomer, which lowers the glass transition temperature of the polymer by copolymerization, so it can be It is important to lower the glass transition temperature by the operation, and there is no restriction on the addition amount except for this point, but preferably the total amount of the self-emulsifiable vinyl polymer and the cellulose derivative is 100 parts by weight. 0 to 150 parts by weight. On the other hand, examples of the film-forming auxiliary include cellosolve, cellosolve acetate, carbitol, butyl carbitol, carbitol acetate, butyl carbitol acetate, hexylene glycol, benzyl alcohol, and texanol. Unlike the plasticizer, the film-forming auxiliary is required to escape from the system immediately after the film is formed. The addition amount of the film forming aid is preferably 0 to 100 parts by weight of the total amount of the self-emulsifiable vinyl polymer and the cellulose derivative.
It is 50 parts by weight, more preferably 5 to 30 parts by weight. The above-mentioned plasticizer and the above-mentioned film-forming auxiliary may be added by such a post-addition method, but they may be made to coexist at the time of solution polymerization to serve as a solvent, or may be added to a polymer solution. The co-existence during the solution polymerization in advance increases the utility value of the plasticizer and the film-forming auxiliary rather than the post-addition, and there is no concern about the dispersion stability destruction due to the post-addition.

The aqueous nail varnish of the present invention can be used as it is, but can be used as an enamel by further adding a pigment. As the pigment, for example,
Red No. 202, Red No. 206, Red No. 220, Red No. 22
Organic pigments such as No. 1, orange No. 203, blue No. 201 and yellow No. 204, lake pigments such as red No. 2, red No. 102, green No. 2, blue No. 1 and purple No. 1, yellow iron oxide, carbon black, And inorganic pigments such as ultramarine blue and titanium oxide. The amount of the pigment to be added is preferably 3 to 20 parts by weight based on 100 parts by weight of the total of the self-emulsifiable vinyl polymer and the cellulose derivative. The aqueous nail polish of the present invention may further contain additives such as a thickener, a dye, a preservative, and a fragrance, if necessary.

Next, a method for producing the aqueous nail varnish of the present invention will be described. The method for producing an aqueous nail varnish of the present invention comprises dispersing an organic solvent solution containing a self-emulsifiable vinyl polymer and cellulose in water, and then removing the organic solvent. As the self-emulsifiable vinyl polymer, cellulose derivative and organic solvent,
The same ones as those used for the aqueous nail polish of the present invention described above are used. The proportions of the respective components may be the same as those of the aqueous nail varnish of the present invention. Further, the pigments and additives used in the above-mentioned aqueous nail polish of the present invention can be added, and the mixing ratio in this case is also as described above, and the description of the other aqueous nail polish shows that the aqueous nail polish of the present invention is used. Applied to the manufacturing method.

In the method for producing an aqueous nail varnish of the present invention, an organic solvent solution containing a self-emulsifiable vinyl polymer and cellulose is dispersed and emulsified. At this time, it is not a problem to add an auxiliary surfactant so as not to impair the water resistance of the nail polish coating film.
When the self-emulsifiable vinyl polymer and the cellulose derivative are emulsified, the self-emulsifiable vinyl polymer solution can be emulsified as it is if it is nonionic, but dissociated by neutralization if it is ionic. Need. If anionic, neutralization with an alkali is performed. Examples of the alkali used for the neutralization include inorganic alkalis such as ammonia, sodium hydroxide and potassium hydroxide, and organic alkalis such as diethanolamine, triethanolamine, dimethylamine and diethylamine. In the case of cationic properties, neutralization with an acid is performed. Examples of the acid used for the neutralization include inorganic acids such as hydrochloric acid, sulfuric acid and phosphoric acid, and organic acids such as acetic acid, propionic acid and lactic acid. As the alkali or acid used for the above neutralization, it is preferable to use an alkali or an acid which is easy to volatilize since the water resistance is improved by evaporating and evaporating the neutralizing agent after the formation of the nail polish coating film. The amount of the alkali or acid used for the neutralization is preferably equal to or less than the equivalent of the functional group. It is meaningless to use beyond this, and the smaller the amount used, the less the problem of odor is. In general, the higher the functional group concentration, the more emulsification is possible with the addition of less neutralizing agent. The addition may be made directly to the polymer solution or to water as a dispersion medium. After emulsifying and dispersing the alkali or acid in water, the organic solvent is removed from the emulsion under reduced pressure. If the polymer concentration is low, it is preferable to further remove water so that the polymer concentration is at least 20% by weight, more preferably at least 30% by weight. What should be noted in this operation is a change in pH. If the residual amount of the acid or alkali greatly deviates from the neutralization equivalent, there is a problem in dispersion stability. If there is a risk of falling into such a situation, adjust the pH by adding an acid or alkali. There is a need to. The method for removing the organic solvent is not particularly limited, and the method can be carried out by, for example, removal under reduced pressure or steam stripping.

In the method for producing an aqueous nail varnish of the present invention, when a pigment is contained, the pigment is added to an organic solvent solution containing a self-emulsifiable vinyl polymer and cellulose, dispersed and then emulsified. Well,
An organic solvent solution containing a self-emulsifiable vinyl polymer and cellulose may be dispersed and emulsified before addition. Further, as the pigment, those used in the above-mentioned aqueous nail varnish of the present invention can be used. The pigment can be added by adding an aqueous emulsion of the pigment to an aqueous nail varnish, or the pigment may be added before emulsification and dispersion. In the former case,
It is necessary to add a water-soluble dispersant and a wetting agent, but when a pigment is added during emulsification and dispersion, such an additive is not required.

[0016]

EXAMPLES The present invention will be specifically described with reference to the following examples, but the present invention is not limited to the following examples. In the following description, unless otherwise indicated.
Parts mean parts by weight. Example 1 methyl methacrylate 60 parts, butyl acrylate 30
Parts, 10 parts of methacrylic acid and 120 of methyl ethyl ketone
The part was charged into a reactor having a stirrer, a reflux condenser, a dropping funnel, a thermometer, and a nitrogen gas inlet tube. The reactor was heated while introducing nitrogen gas, and the temperature inside the reactor was maintained at 70 ° C. Next, 1/2 part of a solution of 2 parts of azobisisobutyronitrile dissolved in 30 parts of methyl ethyl ketone was added to the reactor to initiate polymerization. After reacting for 2 hours, the remaining azobisisobutyronitrile solution was added,
The polymerization reaction was further continued for 3 hours to obtain a self-emulsifiable vinyl polymer solution. The glass transition temperature of the self-emulsifiable vinyl polymer thus obtained was 44 ° C. Next, nitrocellulose having a molecular weight of 80,000 (HIG1 / 2, manufactured by Asahi Kasei Corporation) was dissolved in methyl ethyl ketone so that the concentration of nitrocellulose was 25% by weight. Next, the nitrocellulose solution is added to and dispersed in the self-emulsifiable vinyl polymer solution such that the amount of the nitrocellulose is 50 parts based on 100 parts of the self-emulsifiable vinyl polymer,
A mixed solution was obtained. Then, to 100 parts of the mixed solution, 33 parts of 1% aqueous ammonia was added to neutralize about 75% of the carboxyl groups, and then 67 parts of water were added to obtain a vinyl polymer / methyl ethyl ketone of nitrocellulose. After emulsifying the solution, methyl ethyl ketone was removed under reduced pressure, and then water was removed so that the solid content concentration was 35% by weight, to obtain a vinyl polymer / nitrocellulose aqueous emulsion (aqueous nail polish).

The aqueous emulsion obtained as described above was enameled with the following composition to obtain an aqueous nail polish. Emulsified liquid (solid content 35% by weight) 100 parts Red disperse pigment (Riofast, solid content 33%, manufactured by Toyo Ink Mfg. Co., Ltd.) 11 parts Dibutyl phthalate 7 parts Butyl cellosolve 10 parts 2.5% aqueous hydroxyethyl cellulose solution (HEC Daicel SP900, manufactured by Daicel Chemical Industries, Ltd.) 8 parts The aqueous nail varnish thus obtained was evaluated according to the following [Evaluation criteria for aqueous nail varnish]. The results are shown in [Table 1].

[Evaluation Criteria for Aqueous Nail Polish] (1) Measurement of Hardness The aqueous nail varnish obtained in Example 1 was uniformly applied to a glass plate using a nail enamel brush (application amount: 60 g / m 2).
² ) After drying for one week under the conditions of a temperature of 25 ° C. and a humidity of 60%, the hardness was measured using a micro hardness meter (model MVKC-C, manufactured by Akashi Seisakusho Co., Ltd.). (2) Adhesiveness As a pseudo nail material, a nylon 66 plate having a thickness of 5 mm and a size of 25 × 40 mm was used by smoothing the surface thereof with nail polish sandpaper. Temperature 25 ° C, relative humidity 60
%, The aqueous nail varnish obtained in Example 1 was applied with a nail enamel brush to a thickness suitable for ordinary use to obtain a nail varnish coating. Thirty minutes after the application, the nail polish coating film was peeled off from the nylon plate using a microspatula. The adhesion was evaluated according to the following evaluation criteria. ：: The nail polish coating film is scratched but not peeled off. Δ: The nail polish coating is scratched, and the area around the scratch is slightly peeled off. X: The nail polish coating film is scratched, and the area around the scratch is largely peeled off. (3) Abrasion resistance In the same manner as in (2), the aqueous nail varnish obtained in Example 1 was applied to a nylon plate to obtain a nail varnish coating. Apply 3
After 0 minute, the surface of the nail polish coating film was rubbed 50 times with a 40th cotton broad, and the condition of the scratches was visually observed. The scratch resistance was evaluated according to the following evaluation criteria. ：: The nail polish coating film was not damaged and no decrease in gloss was observed. C: Slight scratches are observed on the nail polish coating film, but no significant decrease in gloss occurs. X: Numerous scratches were made on the nail polish coating film, and a significant decrease in gloss was observed.

(4) Water resistance In the same manner as in (2), the aqueous nail varnish obtained in Example 1 was applied to a nylon plate to obtain a nail varnish coating. Apply 1
After a lapse of time, it was immersed in water at 35 ° C. for 1 hour, and swelling, whitening, softening and peeling were comprehensively evaluated for water resistance according to the following evaluation criteria. ：: No swelling, whitening, softening or peeling was observed. Δ: Expansion, whitening and softening are observed, but no peeling occurs. ×: Swelling, whitening, softening and peeling occur. (5) Drying property The aqueous nail varnish obtained in Example 1 was applied to the fingernails of five female panelists using a nail enamel brush at a thickness used in a usual manner, and the touch drying time was measured. The evaluation was performed based on the evaluation criteria. In the evaluation, the average value of five panelists was used. ：: Touch dry time is less than 3 minutes. Δ: Touch dry time is 3 minutes or more and less than 6 minutes. X: Touch dry time is 6 minutes or more. (6) Gloss The nail polish obtained in Example 1 was applied to fingernails of five female panelists using a nail enamel brush to a thickness normally used, dried for 30 minutes, and visually observed. The gloss was evaluated by using a commercially available organic solvent solution type nail polish coating film as a comparative sample, and evaluated according to the following evaluation criteria. In the evaluation, the average value of five panelists was used. ：: The gloss is at the same level as a commercially available nail polish coating. Δ: The gloss is slightly inferior to a commercially available nail polish coating film. X: The gloss is significantly inferior to a commercially available nail polish coating.

(7) Tactile Sensation The aqueous nail varnish obtained in Example 1 was applied to fingernails of five female panelists using a nail enamel brush in a thickness generally used and dried for 1 hour. The nail was lightly touched with the belly of another finger, and the touch was evaluated according to the following evaluation criteria. In the evaluation, the average value of five panelists was used. ：: The same slippery feeling as a commercial nail polish coating film was felt. C: Felt slightly caught compared to a commercially available nail polish coating film. ×: A sticky feeling was felt. (8) Good durability The aqueous nail varnish obtained in Example 1 was applied to fingernails of five female panelists at 10:00 am using a nail enamel brush at a thickness normally used. After drying for 1 hour,
The hair was provided to a normal life, and the hair was washed once a day. The hair was used for three days, and then evaluated according to the following evaluation criteria. ：: The appearance was the same as before use. Δ: Slight peeling was observed at the tip of one part of the panel. ×: Peeling was observed in all panelists, although the degree was different.

Example 2 Example 1 was repeated except that the amount of methyl methacrylate used was 50 parts, the amount of butyl acrylate was 40 parts, and 10 parts of methacrylic acid was replaced with 10 parts of N, N'-dimethylaminoethyl methacrylate. The same operation was performed to obtain a self-emulsifiable vinyl polymer solution. The glass transition temperature of the self-emulsifiable vinyl polymer thus obtained was 13 ° C. Next, in the same manner as in Example 1, a nitrocellulose solution was added to the self-emulsifiable vinyl polymer solution to obtain a mixed solution. Then, 100 parts of a 1.3% by weight lactic acid aqueous solution was added to 100 parts of the liquid for mixing, emulsified in the same manner as in Example 1, and methyl ethyl ketone was removed under reduced pressure. The water was removed to obtain a vinyl polymer / nitrocellulose aqueous emulsion (aqueous nail polish). The aqueous emulsion obtained as described above was enameled with the following composition to obtain an aqueous nail polish. The above-mentioned emulsion (solid content 35% by weight) 100 parts Red dispersing pigment (EM Red BH, solid content 21%, manufactured by Toyo Ink Mfg. Co., Ltd.) 16 parts Dibutyl phthalate 7 parts Butyl cellosolve 10 parts 2.5% hydroxyethyl cellulose Aqueous solution (HEC Daicel SP900, manufactured by Daicel Chemical Industries, Ltd.) 8 parts The aqueous nail polish thus obtained was evaluated in the same manner as in Example 1. The results are shown in [Table 1].

Example 3 The nitrocellulose solution used in Example 1 was added to the self-emulsifiable vinyl polymer solution obtained in Example 1 with respect to 100 parts of the self-emulsifiable vinyl polymer. The mixture was added so that the amount became 50 parts to obtain a mixed solution. In the mixed solution, 3.2 parts of red No. 202 pigment and 6.6 parts of dibutyl phthalate were added to 100 parts of the mixed solution.
Was added and the mixture was sufficiently dispersed in a small sand grind mill to obtain a pigment dispersion. Next, 0.5% aqueous ammonia was added to the pigment dispersion and an equivalent amount of the pigment dispersion was added to emulsify. After the emulsification, methyl ethyl ketone contained in the emulsion was removed, and then water was removed so that the solid content concentration became 38% by weight to obtain a vinyl polymer / nitrocellulose emulsion (aqueous nail polish). Then, the emulsion 10
10 parts of butyl cellosolve and 10 parts of a 2.5% aqueous solution of hydroxyethylcellulose were added to 0 parts, and the mixture was enamelled to obtain an aqueous nail varnish. The aqueous nail varnish thus obtained was evaluated in the same manner as in Example 1. The results are shown in [Table 1].

Comparative Example 1 A vinyl polymer solution was obtained in the same manner as in Example 1 except that the amounts of methyl methacrylate and methacrylic acid were changed to 68 parts and 2 parts, respectively. The vinyl polymer thus obtained was not self-emulsifiable and had a glass transition temperature of 42 ° C.
Next, the same operation as in Example 1 was performed to obtain a mixed solution of a vinyl polymer and nitrocellulose. Next, 4 parts of sodium dodecylbenzenesulfonate was used as an emulsifier for 100 parts of the mixed solution, and emulsification was performed using a homomixer at a dispersion concentration of 50% as a solution.
After the emulsification, methyl ethyl ketone contained in the emulsion was removed, and then water was removed so that the solid content concentration became 35% by weight, to give a vinyl polymer / nitrocellulose emulsion (aqueous nail polish). Next, the same operation as in Example 1 was performed to enamel the emulsion to obtain an aqueous nail polish. About the aqueous nail polish thus obtained,
Evaluation was performed in the same manner as in Example 1. The results are shown in [Table 1]. Comparative Example 2 To the vinyl-based polymer solution obtained in Example 1, 33 parts of 1% aqueous ammonia was added to 100 parts of the vinyl-based polymer solution, and the same operation as in Example 1 was carried out to emulsify. Then, it was enamelled in the same manner as in Example 1 to obtain an aqueous nail polish. The aqueous nail varnish thus obtained was evaluated in the same manner as in Example 1. The results are shown in [Table 1].

Comparative Example 3 The amounts of methyl methacrylate and butyl methacrylate were set to 50 parts and 48 parts, respectively.
A vinyl-based polymer solution was obtained in the same manner as in Example 1 except that 2 parts of N, N'-dimethylaminoethyl methacrylate was used instead of 0 parts. The vinyl polymer thus obtained was not self-emulsifiable and had a glass transition temperature of 15 ° C. Next, the same operation as in Example 1 was performed to obtain a mixed solution of a vinyl polymer and nitrocellulose. Next, the mixed solution 100
4 parts by weight of sodium dodecylbenzenesulfonate as an emulsifier and a dispersion concentration of 50% as a solution
Then, emulsification was performed using a homomixer. After the emulsification, methyl ethyl ketone contained in the emulsion was removed, and then water was removed so that the solid content concentration became 35% by weight, to give a vinyl polymer / nitrocellulose emulsion (aqueous nail polish). Next, the same operation as in Example 1 was performed to enamel the emulsion to obtain an aqueous nail polish. The aqueous nail varnish thus obtained was evaluated in the same manner as in Example 1. The results are shown in [Table 1].

[0025]

[Table 1] Example Comparative Example 1 2 3 1 2 3 Hardness 11 8 11 10 4 12 Adhesion ○ ○ ○ △ ○ × Scratch resistance ○ ○ ○ ○ × △ Water resistance ○ ○ ○ × △ △ Drying ○ ○ ○ △ △ △ Gloss ○ ○ ○ △ ○ △ Tactile feel ○ ○ ○ △ × △ Good holding ○ ○ ○ × △ △

[0026]

As described in detail above, the aqueous nail varnish of the present invention contains an aqueous emulsion containing a self-emulsifiable vinyl polymer and a cellulose derivative. It is excellent in abrasion resistance, water resistance, drying property and tactile sensation, can obtain good gloss, and has good durability. In addition, the nail polish of the present invention has less organic solvent content than conventional organic solvent-type nail polish, and therefore has no flammability and does not cause any adverse effect on the human body.

Claims (7)

[Claims] 1. An aqueous nail varnish comprising an aqueous emulsion containing a self-emulsifiable vinyl polymer and a cellulose derivative. 2. The self-emulsifiable vinyl polymer is obtained by copolymerizing a vinyl monomer having no strong hydrophilic side chain contributing to emulsification and a vinyl monomer having strong hydrophilic side chain contributing to emulsification. The aqueous nail polish according to claim 1, which is obtained. 3. The aqueous nail polish according to claim 1, wherein the self-emulsifiable vinyl polymer has a glass transition temperature of -10 to 70 ° C. 4. The cellulose derivative according to claim 1, wherein the cellulose derivative is a cellulose ester, and the cellulose derivative is contained in an amount of 10 to 200 parts by weight based on 100 parts by weight of the self-emulsifiable vinyl polymer. 4. The aqueous nail polish according to any one of the above items 3. 5. The aqueous nail polish according to claim 1, further comprising a pigment. 6. An organic solvent solution containing a self-emulsifiable vinyl polymer and a cellulose derivative is dispersed in water,
Next, a method for producing an aqueous nail varnish, comprising removing the organic solvent. 7. The self-emulsifiable vinyl polymer is obtained by copolymerizing a vinyl monomer having no strong hydrophilic side chain contributing to emulsification and a vinyl monomer having strong hydrophilic side chain contributing to emulsification. The method for producing an aqueous nail varnish according to claim 6, which is obtained.