JPH0769833A - Water-based maincuring agent - Google Patents

Abstract

PURPOSE:To obtain a new type of water-based manicuring agents which can replace existing manicuring agents dispersed in an organic sol-vent because of their high gloss, adhesion to nails, resistance to water, strength of coated films with no flammability and solvent odor. CONSTITUTION:This manicuring agent contains two polymers of less than 40,000 weight-average molecular weight and of more than 50,000 weight-average molecular weight so that the total amount may reach 5 to 60wt.% in the solid basis in the form of a water-based polymer emulsion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-based nail enamel, and more specifically, a gloss, adhesion, water resistance, and a coating mainly composed of water instead of an organic solvent which has been conventionally used for nail enamel. The present invention relates to a water-based nail enamel which has excellent film strength and is free from flammability and solvent odor.

In the present invention, the nail enamel includes nail enamel, nail enamel base coat, nail enamel overcoat and the like.

[0003]

2. Description of the Related Art Nail enamel, nail enamel base coat, nail enamel overcoat, etc.
It is widely used for the purpose of coloring or decorating nails and preventing scratches on nails.

The conventional nail enamel includes a resin such as nitrocellulose as a film forming agent and an alkyd resin, a plasticizer,
The mainstream is made of organic solvents as the main base.
However, although these organic solvent-based nail polishes are excellent in various properties as a coating film forming agent, they use an organic solvent, so that flammability, solvent odor, adverse effects on the human body, etc. It is problematic and has serious drawbacks, especially in terms of adverse effects on the nail itself.

In order to solve these drawbacks, in recent years, an aqueous nail enamel which does not use an organic solvent has been developed and proposed. For example, JP-A-54-28836 and JP-B-5
Japanese Patent Application Laid-Open No. 5-43445 discloses a nail enamel comprising an acrylic polymer emulsion, but as far as the inventors of the present invention have made additional trials, these are a brushing property, a film-forming property (especially low-temperature film-forming property), It is inferior in terms of the gloss of the coating film.

Further, Japanese Patent Application Laid-Open No. 56-131513 and Japanese Patent Application Laid-Open No. 57-56410 disclose nail enamel comprising an acrylic polymer microemulsion, which can be obtained by these nail enamel. Coatings have the disadvantage that they are quite brittle against mechanical abrasion.

Further, JP-A-56-131513 and JP-A-62-63507 disclose peelable water-based nail enamel, which are also easily peeled off in daily use. It has the drawback that it is not practical.

[0008]

Therefore, it has been desired to develop a water-based nail enamel which is mainly composed of water, has a glossy coating film, is excellent in adhesion and water resistance, and has high coating film strength.

[0009]

In view of the above situation, the present inventors have conducted extensive studies to solve the above problems, and as a result,
By combining a polymer having a weight average molecular weight of 40,000 or less and a polymer having a weight average molecular weight of 50,000 or more,
It was found that a water-based nail enamel having advantages such as gloss, adhesion, water resistance, coating strength, flammability, and no solvent odor can be obtained by blending it as an aqueous polymer emulsion, and the present invention is obtained. completed.

That is, the present invention has a weight average molecular weight of 40,
000 or less polymer (hereinafter sometimes abbreviated as "low molecular weight polymer") and weight average molecular weight 50,000
The total amount of the above polymers (hereinafter, may be abbreviated as "high molecular weight polymer") in terms of solid content is 5 to 60% by weight.
The present invention provides a water-based nail enamel characterized by containing it as an aqueous polymer emulsion.

In the present invention, the "aqueous polymer emulsion" refers to an emulsion prepared by dispersing a polymer in a solvent mainly containing water.

Such an aqueous polymer emulsion comprises a low molecular weight polymer and a high molecular weight polymer obtained by polymerizing one or more monomers having a polymerizable double bond by a known polymerization method in water. Method of dispersing, method of mixing aqueous emulsion of low molecular weight polymer and aqueous emulsion of high molecular weight polymer obtained by emulsion polymerization of the monomer, dispersion of high molecular weight polymer in aqueous emulsion of low molecular weight polymer Or a method of dispersing a low molecular weight polymer in an aqueous emulsion of a high molecular weight polymer.

Specific examples of the monomer having a polymerizable double bond used herein include ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid and crotonic acid. Aromatic mono- and divinyl compounds such as styrene, methylstyrene, chlorostyrene, alkylstyrene, divinylbenzene; methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl Acrylate, 2-
Acrylic esters such as ethylhexyl methacrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, glycidyl acrylate, glycidyl methacrylate, ethylene glycol diacrylate, ethylene glycol dimethacrylate, tertiary butyl acrylate, tertiary butyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate and methacrylic acid. Ester; acrylonitrile,
Vinyl cyanide compounds such as methacrylonitrile; ethylenic amides such as acrylamide, methacrylamide, N-methylolacrylamide, N-methylolmethacrylamide; vinyl esters such as vinyl acetate; vinyl halides such as vinyl chloride and vinylidene chloride; amino Ethylenic amines such as ethyl acrylate, aminoethyl methacrylate, dimethylaminoethyl acrylate, dimethylaminoethyl methacrylate, diethylaminoethyl acrylate, diethylaminoethyl methacrylate; trifluoroethyl methacrylate, 2, 2, 3,
3-tetrafluoropropyl methacrylate, 2,2
Fluorine-based monomers such as 3,3,4,4-hexafluorobutyl methacrylate, perfluorooctyl methacrylate, and perfluorooctyl acrylate; silicone macromonomers represented by the following general formulas (1) to (5) Is mentioned.

[0014]

[Chemical 1]

[In the above formula, R ¹ represents a hydrogen atom or a methyl group, R ^{2 to} R ¹⁰ each represent a lower alkyl group, a lower alkoxy group or a phenyl group, and X represents the following formula;

[0016]

[Chemical 2]

The group represented by: and n is a number from 1 to 500] These monomers may be used alone or in combination of two or more.

The polymerization can be carried out by a known polymerization method such as emulsion polymerization or non-emulsion polymerization. However, from the viewpoint of convenience of operation, emulsion polymerization carried out in the presence of a plasticizer or a film-forming auxiliary directly gives a direct low molecular weight. It is preferred to prepare an aqueous emulsion of the polymer or an aqueous emulsion of the high molecular weight polymer.

Specific examples of the plasticizer or film forming aid used in such polymerization include cellosolves such as cellosolve, methyl cellosolve and butyl cellosolve; carbitol, dimethyl carbitol, diethyl carbitol, butyl carbitol, dibutyl carbitol. Carbitols such as tolls; Carbonates such as ethylene carbonate and propylene carbonate; Acetates such as cellosolve acetate, butyl cellosolve acetate, butyl carbitol acetate, sucrose acetate; Alcohols such as hexanol, benzyl alcohol, phenethyl alcohol; Hexylene glycol , Diols such as ethylene glycol and propylene glycol; phthalic acid diesters, adipic acid diesters, succinic acid diesters, sebacine Diesters, abietic acid esters, caprylic acid esters, caproic acid esters, acetic acid esters, enanthate esters, myristic acid esters, esters such as citric acid esters;
Benzoic acid esters such as sucrose benzoate; diethylbenzene and the like.

The amount of the plasticizer added is from the viewpoint of polymerization stability, storage stability, water resistance of the coating film, durability, etc.
1 to 50 parts by weight, preferably 5 to 30 parts by weight, relative to 00 parts by weight
More preferably parts by weight. Further, a plasticizer or a film-forming aid may be further added to the obtained aqueous polymer emulsion, if necessary.

The polymerization initiator used in the polymerization reaction is not particularly limited, but for example, hydroperoxides such as cumene hydroperoxide, diisopropylbenzene hydroperoxide, paramenthane hydroperoxide, benzoyl peroxide and lauroyl peroxide. Peroxides such as oxides, organic polymerization initiators such as azo compounds such as azobisisobutyronitrile, and inorganic polymerization initiators such as persulfates such as potassium persulfate, sodium persulfate, ammonium persulfate, etc. Is mentioned. Further, a so-called redox-based polymerization initiator, which uses a reducing agent such as sodium bisulfite, ascorbic acid and a salt thereof in combination with the polymerization initiator, can also be used.

Further, a polymerization chain transfer agent may be added during the polymerization reaction. Specific examples of the polymerization chain transfer agent used include, for example, octyl mercaptan, n-dodecyl mercaptan, t-dodecyl mercaptan, n-hexadecyl mercaptan, n-tetradecyl mercaptan,
mercaptans such as t-tetradecyl mercaptan;
Xanthogen disulfides such as dimethylxanthogen disulfide, diethylxanthogen disulfide, and diisopropylxanthogen disulfide; thiuram disulfides such as tetramethylthiuram disulfide, tetraethylthiuram disulfide, and tetrabutylthiuram disulfide; halogenated hydrocarbons such as carbon tetrachloride and ethylene bromide Hydrocarbons such as pentaphenylethane; and acrolein, methacrolein, allyl alcohol, 2-ethylhexyl thioglycolate, terbinolene, α-terpinene, γ-terpinene, dipentene, α-methylstyrene dimer (2-4-diphenyl- It is preferable that 4-methyl-1-pentene is 30 parts by weight or more), and further 9,10-dihydroanthracene and 1,4-dihydro. Futaren, indene, 1,4
Unsaturated cyclic hydrocarbon compounds such as cyclohexadiene; unsaturated heterocyclic compounds such as xanthene and 2,5-dihydrofuran. These may be used alone or in combination of two or more.

At the time of polymerization, it is preferable to add a surfactant for stabilizing dispersion. The surfactant used is not particularly limited, and examples thereof include general anionic, cationic or nonionic surfactants. Further, two or more kinds may be used in combination such as a combination of an anion type and a nonion type and a combination of a cation type and a nonion type.

Nonionic surfactants include, for example, polyethylene oxide alkyl ether, polyethylene oxide alkylphenyl ether, polyethylene oxide-polypropylene oxide block copolymer, and anionic surfactants include, for example, alkylbenzene sulfonate, alkylnaphthalene-sulfonate, polyethylene. Examples thereof include oxide alkyl ether sulfate. The cationic surfactants include primary, secondary, and tertiary having an aliphatic hydrocarbon group.
Examples thereof include secondary amine salts and quaternary ammonium salts.

The amount of the surfactant added is 100
The amount is preferably 5 parts by weight or less, more preferably 3 parts by weight or less with respect to parts by weight. If it exceeds 5 parts by weight, the physical properties and adhesiveness of the film deteriorate.

The weight average molecular weight of the low molecular weight polymer obtained by the polymerization is 40,000 or less, 5,000 to
30,000 is more preferable. Further, the weight average molecular weight of the high molecular weight polymer is 50,000 or more,
More preferably, it is from 00 to 300,000. Even if a polymer having a weight average molecular weight outside the range of the present invention is used, the effect of the present invention cannot be obtained. In the present invention, the weight average molecular weight is a value obtained by measurement by gel filtration chromatography (GPC).

In the water-based nail enamel of the present invention, the low molecular weight polymer and the high molecular weight polymer are used as a film-forming base, and one kind of each may be mixed, but two or more kinds are mixed and mixed. May be. Further, these are 5 to 60 in terms of solid content as a total of both in the aqueous nail varnish of the present invention.
It is blended as an aqueous polymer emulsion so as to be weight% (hereinafter simply referred to as%). If the content is less than 5%, several repeated coatings are required to obtain a practically necessary coating film, and if it exceeds 60%, the viscosity of the nail enamel becomes too high, and the coating properties such as brush release properties deteriorate. Can be seen.

Further, the mixing ratio of the high molecular weight polymer and the low molecular weight polymer varies depending on the type and blending amount of each polymer used, but preferably the low molecular weight polymer: high molecular weight polymer = as a solid content weight ratio after mixing. 99.5:
0.5 to 50:50, particularly preferably 90:10
~ 70: 30.

The water-based nail varnish of the present invention contains, in a range that does not impair the effects of the present invention, components other than the above-mentioned components that are generally used as water-based nail varnish ingredients such as oil, moisturizer, and ultraviolet absorber. Agents, chelating agents, pH adjusters, preservatives, thickeners, dyes, pigments, fragrances and the like can be appropriately added.

Here, as the pigment, R-221,
Known organic pigments such as R-226, B-404, and Y-401, and inorganic pigments such as titanium dioxide, brown iron oxide, red iron oxide, titanium mica, and bismuth oxychloride can be used, but are not limited thereto. Not a thing.

Further, known thickeners can be used, and organic thickeners such as polyvinyl alcohol, polyvinylpyrrolidone, polyacrylamide, polyethylene oxide, methylcellulose, hydroxyethylcellulose and hydroxypropylmethylcellulose, and inorganic bentonites can be used. Thickeners and hydrous oxides such as boehmite can be used.

The water-based nail enamel of the present invention can be manufactured according to a conventional method according to each application.

[0033]

The aqueous polymer emulsion used in the present invention, when used as a film-forming component of a water-based nail enamel, can give a film particularly excellent in water resistance. Therefore, the water-based nail enamel of the present invention using this water-based polymer emulsion is excellent in gloss, adhesion, water resistance, coating strength, etc., and has excellent properties such as flammability and no solvent odor. Therefore, it can be used as a new water-based nail enamel replacing the conventional organic solvent-based nail enamel.

[0034]

EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited thereto. still,
In the following, "parts" and "%" are "parts by weight",
"% By weight" is shown.

Synthesis Example 1 Synthesis of polymer emulsion A: stirrer, reflux condenser,
A reactor equipped with a dropping funnel, a thermometer, and a nitrogen inlet tube was charged with 50 parts of methyl ethyl ketone, and nitrogen gas was flowed to remove dissolved oxygen. On the other hand, 35 parts of methyl ethyl ketone, 71.7 parts of methyl methacrylate, 20.1 parts of n-butyl acrylate, 8.2 parts of N, N-dimethylaminoethyl methacrylate, 0.2 part of azobisisobutyronitrile and n were added to the dropping funnel. -0.5 parts of dodecyl mercaptan were charged. The temperature in the reactor was raised to 80 ° C. with stirring, and a methyl ethyl ketone solution of the above monomer and radical initiator was added dropwise from a dropping funnel over 2.5 hours. 2 hours after the end of dropping, 0.2 part of azobisisobutyronitrile, n
-A solution of 0.5 parts of dodecyl mercaptan dissolved in 10 parts of methyl ethyl ketone was added. After aging at the same temperature for 3 hours, 0.1 parts of azobisisobutyronitrile and 0.3 parts of n-dodecyl mercaptan dissolved in 5 parts of methyl ethyl ketone were added again, and the reaction was continued for another 5 hours to give a copolymer. Obtained. A part of the obtained copolymer was isolated and the molecular weight was measured by gel filtration chromatography (GPC). The weight average molecular weight (Mw) was 30,000. The calibration curve for gel filtration chromatography was prepared using polystyrene as a standard substance (solvent: tetrahydrofuran). After completion of the reaction, the copolymer solution was cooled to room temperature, 4.5 parts of lactic acid was added to neutralize the solution, and further 300 rpm
At 300 ° C., 300 parts of ion-exchanged water was added, and then methyl ethyl ketone was distilled off at 40 ° C. under reduced pressure.
(Solid content 35%) was obtained.

Synthesis Example 2 Synthesis of Polymer Emulsion B: In the same manner as in Synthesis Example 1, 71.7 parts of methyl methacrylate as a monomer,
20.1 parts of n-butyl acrylate, 8.2 parts of N, N-dimethylaminoethyl methacrylate and 0.2 part of azobisisobutyronitrile were used and copolymerized in methyl ethyl ketone. Next, 4.5 parts of lactic acid was added to this copolymer for neutralization, and the phase was inverted to water in the same manner as in Synthesis Example 1 to obtain an emulsion having a solid content of 35%. The weight average molecular weight (Mw) of the copolymer in the obtained emulsion was 75,000.

Synthesis Example 3 Synthesis of polymer emulsion C: stirrer, reflux condenser,
150 parts of water, 3 parts of sodium lauryl sulfate and 0.5 part of potassium persulfate were charged into a reaction vessel equipped with a dropping funnel, a thermometer, and a nitrogen introducing tube, and nitrogen gas was passed to remove dissolved oxygen. On the other hand, 78 parts of styrene, 22 parts of 2-ethylhexyl acrylate and 10 parts of dibutyl phthalate were added to the dropping funnel.
, 8.9 parts of n-dodecyl mercaptan. The temperature of the reaction vessel was raised to 70 ° C. with stirring, and the above monomer was dropped from the dropping funnel over 3 hours. After completion of the dropping, aging was carried out for 3 hours to remove some agglomerates, and to obtain a solid content of 4
A 5% emulsion was obtained. The weight average molecular weight (Mw) of the copolymer in the obtained emulsion was 11,000 as measured by GPC (polystyrene standard).
4 parts of butyl carbitol was added to 100 parts of the above emulsion, and the mixture was stirred for 30 minutes using a homodisper to obtain a polymer emulsion C (solid content 43%).

Synthesis Example 4 Synthesis of polymer emulsion D: stirrer, reflux condenser,
150 parts of water, 3 parts of sodium lauryl sulfate and 0.5 part of potassium persulfate were charged into a reaction vessel equipped with a dropping funnel, a thermometer, and a nitrogen introducing tube, and nitrogen gas was passed to remove dissolved oxygen. On the other hand, 78 parts of styrene, 22 parts of 2-ethylhexyl acrylate and 10 parts of dibutyl phthalate were added to the dropping funnel.
Parts, 2.5 parts of n-dodecyl mercaptan. The temperature of the reaction vessel was raised to 70 ° C. with stirring, and the above monomer was dropped from the dropping funnel over 3 hours. After completion of the dropping, aging was carried out for 3 hours to remove some agglomerates, and to obtain a solid content of 4
A 5% emulsion was obtained. The weight average molecular weight (Mw) of the copolymer in the obtained emulsion was 28,000 as measured by GPC (polystyrene standard).
4 parts of butyl carbitol was added to 100 parts of the above emulsion, and the mixture was stirred for 30 minutes using a homodisper to obtain a polymer emulsion D (solid content: 43%).

Synthesis Example 5 Synthesis of polymer emulsion E: stirrer, reflux condenser,
150 parts of water, 3 parts of sodium lauryl sulfate and 0.5 part of potassium persulfate were charged into a reaction vessel equipped with a dropping funnel, a thermometer, and a nitrogen introducing tube, and nitrogen gas was passed to remove dissolved oxygen. On the other hand, 78 parts of styrene, 22 parts of 2-ethylhexyl acrylate and 10 parts of dibutyl phthalate were added to the dropping funnel.
Parts, 1.2 parts of n-dodecyl mercaptan. The temperature of the reaction vessel was raised to 70 ° C. with stirring, and the above monomer was dropped from the dropping funnel over 3 hours. After completion of the dropping, aging was carried out for 3 hours to remove some agglomerates, and to obtain a solid content of 4
A 5% emulsion was obtained. The weight average molecular weight (Mw) of the copolymer in the obtained emulsion was 58,000 as measured by GPC (polystyrene standard).
4 parts of butyl carbitol was added to 100 parts of the above emulsion, and stirred for 30 minutes using a homodisper to obtain a polymer emulsion E (solid content 43%).

Synthesis Example 6 Synthesis of polymer emulsion F: stirrer, reflux condenser,
150 parts of water, 3 parts of sodium lauryl sulfate and 0.5 part of potassium persulfate were charged into a reaction vessel equipped with a dropping funnel, a thermometer, and a nitrogen introducing tube, and nitrogen gas was passed to remove dissolved oxygen. On the other hand, 78 parts of styrene, 22 parts of 2-ethylhexyl acrylate and 10 parts of dibutyl phthalate were added to the dropping funnel.
Parts, 0.03 parts of n-dodecyl mercaptan.
The temperature of the reaction vessel was raised to 70 ° C. with stirring, and the above monomer was dropped from the dropping funnel over 3 hours. After dropping, 3
Aging was carried out for a while to remove some aggregates, and an emulsion having a solid content of 45% was obtained. The weight average molecular weight (Mw) of the copolymer in the obtained emulsion was 200,000 as measured by GPC (polystyrene standard). Butyl carbitol 4 in 100 parts of the above emulsion
Parts were added, and the mixture was stirred for 30 minutes using a homodisper to obtain a polymer emulsion F (solid content 43%).

Example 1 An aqueous nail enamel having the following formulation was prepared.

[0042]

(Table 1) (Formulation) Polymer emulsion A (Mw = 30,000) 80 parts Polymer emulsion B (Mw = 75,000) 20 parts Pigment (red pigment R-221) 3 parts Ion-exchanged water 10 parts Hydroxyethyl cellulose 0. 5 parts Perfume 0.1 part Preservative 0.1 part Silicone antifoam 0.1 part

(Manufacturing Method) A pigment slurry pulverized with a sand grinder, a polymer emulsion, a thickener and other components were added and uniformly mixed with stirring, and finally deaerated to prepare a water-based nail enamel.

Example 2 An aqueous nail enamel having the following formulation was prepared in the same manner as in Example 1.

[0045]

(Table 2) (Formulation) Polymer emulsion D (Mw = 28,000) 90 parts Polymer emulsion F (Mw = 200,000) 10 parts Pigment (red pigment R-221) 3 parts Ion-exchanged water 10 parts Bentonite 0.5 Part Perfume 0.1 part Preservative 0.1 part Silicone antifoam 0.1 part

Comparative Example 1 A water-based nail enamel having the following formulation was prepared in the same manner as in Example 1.

[0047]

(Table 3) (Formulation) Polymer emulsion F (Mw = 200,000) 100 parts Pigment (red pigment R-221) 3 parts Ion-exchanged water 10 parts Bentonite 0.5 parts Perfume 0.1 parts Preservatives 0.1 parts Silicone antifoaming agent 0.1 part

Comparative Example 2 An aqueous nail enamel having the following formulation was prepared in the same manner as in Example 1.

[0049]

(Table 4) (Formulation) Polymer emulsion C (Mw = 11,000) 90 parts Polymer emulsion D (Mw = 28,000) 10 parts Pigment (red pigment R-221) 3 parts Ion-exchanged water 10 parts Bentonite 0.5 Part Perfume 0.1 part Preservative 0.1 part Silicone antifoam 0.1 part

Comparative Example 3 An aqueous nail enamel having the following formulation was prepared in the same manner as in Example 1.

[0051]

(Table 5) (Formulation) Polymer emulsion E (Mw = 58,000) 90 parts Polymer emulsion F (Mw = 200,000) 10 parts Pigment (red pigment R-221) 3 parts Ion-exchanged water 10 parts Bentonite 0.5 Part Perfume 0.1 part Preservative 0.1 part Silicone antifoam 0.1 part

Test Example 1 The water-based nail enamel of Examples 1 and 2 and Comparative Examples 1 to 3 were evaluated for dryness, gloss, adhesiveness, water resistance, abrasion resistance and odor according to the following evaluation methods. . The results are shown in Table 6.

(Evaluation Method) (1) Dryability A sample is applied to a nail with a nail enamel brush under the conditions of a temperature of 25 ° C. and a relative humidity of 60%, and a finger touch and a drying time are measured. ◯: less than 3 minutes Δ: 3 minutes or more and less than 6 minutes x: 6 minutes or more

(2) Gloss In the dryness evaluation, the gloss of the dried coating film after 30 minutes is visually evaluated.

(3) Adhesiveness At the time of dryness evaluation, the adhesiveness to the nail after 30 minutes is evaluated by scraping off the film from the surface with a micro spatula.

(4) Water resistance A sample was uniformly applied to a nylon plate having a size of 0.5 × 15 × 40 mm with a nail enamel brush, and dried for 1 hour at a temperature of 25 ° C. and a relative humidity of 60%. The film is immersed in water at 35 ° C. for 1 hour and evaluated for deterioration of the coating film (white turbidity, swelling, softening, peeling, etc.).

(5) Abrasion resistance At the time of dryness evaluation, the state after 30 minutes of rubbing the dry coating film with a cotton cloth is observed.

(6) Smell Sensory evaluation of odor with the mouth of nail enamel bottle. still,
The evaluation items (2) to (6) were evaluated as follows. ◎: Very good ○: Good △: Normal ×: Poor

[0059]

[Table 6]

As is clear from these results, the water-based nail enamel of the present invention was superior to the conventional ones in terms of adhesion, water resistance, abrasion resistance and the like.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takehiro Tsutsumi 4-1 Kinryocho, Wakayama, Wakayama Kao Kiwa Dormitory

Claims (1)

[Claims] 1. A polymer having a weight average molecular weight of 40,000 or less and a polymer having a weight average molecular weight of 50,000 or more are contained as an aqueous polymer emulsion so that the total amount in terms of solid content is 5 to 60% by weight. A characteristic water-based nail polish.