JPH10218735A - Nail cosmetic preparation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a nail coating with sufficient hardness, excellent gloss and luster. SOLUTION: This nail cosmetic preparation is a blend of a film forming agent, a solvent and ultra-fine powder of an inorganic compound with the mean particle size of 1 to 100nm. As the ultra-fine powder of inorganic compound, ultra-fine silica powder or ultra-fine powder of inorganic compound with the refractive index of 1.8 or more is blended. Ultra-fine powder of inorganic oxides including titanium oxide is preferable as the ultra-fine powder of inorganic compound with the refractive index of 1.8 or more. The ultra-fine inorganic powder is preferably blended in an amount of 2 to 80wt.% based on the weight of the coating film component including the ultra-fine powder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cosmetic for nails which protects nails, and which can form a film having excellent hardness, gloss and gloss on the nails.

[0002]

2. Description of the Related Art Nail cosmetics are a series of cosmetics for applying a film-forming solution to nails to form a resin film, protecting the nails, and imparting gloss, gloss, or color to the nails to beautifully dress the nails. The base coat and the top coat are known in addition to typical nail lacquers.

[0003] Nail lacquers are generally used as film-forming components, such as film-forming agents such as nitrocellulose, alkyd resins and acrylic resins, and plasticizers such as phthalic acid esters.
It is composed of a coloring material such as an inorganic or organic pigment, and a solvent such as ethyl acetate, butyl acetate, ethanol, toluene, or an aliphatic hydrocarbon as an evaporating component. In recent years, non-organic solvents obtained by emulsifying an acrylic resin or the like in water are also used from the viewpoint of safety.

[0004] Nail lacquers have conventionally been improved in decorative properties such as gloss and color by adjusting the molecular weight and composition of nitrocellulose or the like as a film-forming component. For example, the gloss of a film is greatly affected by the refractive index of the film, and the greater the difference between the refractive index of the film and the refractive index of air, the higher the light reflectance on the film surface and the higher the gloss. However, since the refractive index of these resins is generally about 1.46 to 1.53, there is a limit to the improvement of decorative properties such as gloss and color only by adjusting or improving the resin components.

JP-A-8-40820 discloses a colloidal suspension of inorganic oxides such as TiO ₂ , Al ₂ O ₃ , SiO ₂ and water and / or alcohol produced by a sol-gel method. Sprays on hair and nails to form a film,
A method for imparting properties such as gloss, shine, and gloss is disclosed. If a colloidal suspension containing a metal oxide having a refractive index of 1.9 or more, such as TiO ₂ , is used, the gloss of hair and the like can be reduced. It is disclosed that it can be increased.

However, in the above-described method, a film is formed by spraying a colloidal suspension of an inorganic oxide using water and / or alcohol as a medium on a nail or the like. In addition, aggregation of the inorganic oxide is likely to occur at the time of formation, so that the resulting film may be non-uniform and gloss may not be obtained. Further, since the components are different from those of ordinary nail lacquers, the feeling of use when applied to nails is completely different.

On the other hand, in order to improve the film hardness, it is conceivable to first harden the resin itself. However, when the resin is hardened, the film becomes brittle and the adhesion to the nails also decreases.
Furthermore, there is a method in which a resin having good adhesion to the nail and a hard resin having high friction are combined and mixed. However, there is a limit in improving the hardness, and in reality, sufficient film hardness is not obtained.

[0008]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, and improves the film hardness and glossiness by blending specific fine particles into a nail cosmetic so that the hardness is improved. It is an object of the present invention to provide a nail cosmetic capable of forming a film excellent in gloss and gloss on a nail.

[0009]

Means for Solving the Problems The nail cosmetic of the present invention is characterized in that fine particles of an inorganic compound having an average particle diameter of 1 to 100 nm are blended as a film component. The inorganic compound fine particles are preferably silica fine particles or inorganic compound fine particles having a refractive index of 1.8 or more, and the inorganic compound fine particles having a refractive index of 1.8 or more are preferably inorganic oxide fine particles containing titanium oxide. Further, it is preferable that the inorganic oxide fine particles are blended in an amount of 2 to 80% by weight based on the film component containing these fine particles.

The inorganic oxide fine particles containing titanium oxide are made into a homogeneous aqueous solution by adding hydrogen peroxide to a dispersion containing titanium oxide hydrate, and the fine particles obtained by heating this aqueous solution, Fine particles are preferably obtained by adding hydrogen peroxide to a dispersion containing titanium hydrate to form a uniform aqueous solution, and heating the aqueous solution in the presence of an inorganic compound of an element other than titanium.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a typical nail lacquer as a cosmetic for nails will be described. However, the present invention is applicable to a base coat, a top coat and the like in addition to the nail lacquer.

A nail lacquer generally comprises a film component and an evaporating component. The film component includes, in addition to a film forming agent, coloring materials such as inorganic pigments, organic pigments and dyes, and plasticizers such as camphor and phthalate. Is included. As the film forming agent, nitrocellulose, alkyd resin, acrylic resin, polyester resin, polyurethane resin and the like,
As long as a film is formed after the solvent evaporates, it can be used in principle. Further, as the evaporation component, ethyl acetate, butyl acetate, acetone, methyl ethyl ketone, isopropanol, organic solvents such as butanol, and,
If necessary, toluene, xylene, aliphatic hydrocarbon or the like is used as a diluent.

In the nail cosmetic of the present invention, inorganic compound fine particles are blended as one of the above-mentioned film components. The average particle diameter of the inorganic compound fine particles is desirably 1 to 100 nm, preferably 2 to 80 nm. 100nm
If it exceeds 300, the scattering of light by the fine particles is increased, the transparency of the obtained film is reduced, and the color tone of the film is also affected. Further, the effect of improving the film hardness is reduced. On the other hand, if it is less than 1 nm, the stability of the fine particles themselves is reduced, and the dispersibility in the cosmetic may be poor.

The inorganic compound used in the present invention is not particularly limited as long as it improves the hardness or the gloss of the film together with the hardness of the film. Examples of the inorganic compound include silica, titanium oxide, zinc oxide, and the like.
Inorganic oxides such as zirconium oxide, cerium oxide, tin oxide, antimony oxide, alumina or tantalum oxide, or fluorides such as MgF ₂ , CaF _2, and a mixture or a composite compound of two or more of the above inorganic oxides are preferable. Used.

Among the inorganic compound fine particles, silica fine particles have a remarkable effect of improving the hardness of the film. When the purpose is to improve the gloss and gloss of the film in addition to the improvement in hardness, fine particles of an inorganic compound having a refractive index of 1.8 or more, preferably 2.0 or more are used. As the fine particles, fine particles made of an inorganic oxide such as titanium oxide, zinc oxide, zirconium oxide, cerium oxide, tin oxide, antimony oxide, alumina or tantalum oxide are used.

Further, if the fine particles are composed of fine particles or a mixture of composite oxides containing one or more inorganic oxides having a refractive index of 1.8 or more and have a refractive index of 1.8 or more, Used as a coating component of the present invention. Here, the composite oxide is a composite compound in which two or more oxides including at least an oxide having a refractive index of 1.8 or more are chemically bonded, or the surface of appropriate fine particles has a refractive index of 1.8. Fine particles coated with one or more of the above inorganic oxides.

In the present invention, titanium oxide is particularly preferred as the inorganic oxide having a refractive index of 1.8 or more. Further, as the composite oxide containing titanium oxide, TiO ₂ —Si
O ₂ , TiO ₂ —Al ₂ O ₃ , TiO ₂ —ZrO ₂ , T
_{iO 2 -SiO 2 -ZrO 2, TiO} 2 -SiO 2 -A
l ₂ O _{3 and the} like, and fine particles in which the surface of a silica fine particle is coated with an inorganic oxide such as TiO ₂ or TiO ₂ -ZrO ₂ . In the composite oxide fine particles, an oxide other than titanium oxide has a refractive index of less than 1.8,
For example, in the case of silica or the like, the content of titanium oxide is preferably 40% by weight or more. In the case of such fine particles made of titanium oxide or a composite oxide containing titanium oxide, in order to suppress the photoactivity of titanium oxide, the surface of these fine particles is coated with silica or the like to such an extent that the refractive index does not decrease. Can also. In addition, barium titanate,
Fine particles containing a perovskite-type composite oxide such as calcium titanate and strontium titanate can also be used as the coating component of the present invention.

In the present invention, as the silica fine particles, silica sol or silica gel obtained by removing alkali from alkali silicate, or silica fine particles obtained by hydrolyzing an organic silicon compound such as tetraethoxysilane are used. Can be produced by a known method.

The method for producing the inorganic oxide fine particles is not particularly limited, and a known method can be employed. For example, hydrated oxides obtained by hydrolyzing one or a mixture of two or more of the above metal salts, metal salts or metal alkoxides and / or fine particles containing oxides are used.

A preferable method for producing fine particles containing titanium oxide is disclosed in JP-A-63-229 by the applicant of the present invention.
No. 139, a titanium oxide sol or a composite titanium oxide sol produced based on the method disclosed in JP-A-139-139.
For example, an aqueous solution in which titanium oxide hydrate is dissolved by adding hydrogen peroxide to a gel or sol of titanium oxide hydrate obtained by a known method or a mixture thereof is prepared. Next, the obtained aqueous solution is heated to 60 ° C. or higher to obtain a sol in which titanium oxide fine particles are dispersed. Further, in the case of composite oxide fine particles with titanium oxide, after adding a metal compound such as a salt of a metal, an oxide, or a hydrate to be composited with the above aqueous solution, and heating the mixture, the desired titanium oxide can be obtained. A sol in which the composite oxide fine particles are dispersed is obtained. In this case, the metal compound to be complexed may be first added to the titanium oxide hydrate gel or sol, and then hydrogen peroxide may be added.

Furthermore, a mixed gel or a mixed sol obtained by hydrolyzing a mixture of a titanium salt and another metal salt can be used as a starting material. Further, composite oxide fine particles coated with an inorganic oxide containing titanium oxide, for example, a titanium salt such as titanium tetrachloride is added to a dispersion liquid of fine particles such as silica and hydrolyzed, and the surface of the silica fine particles is coated with titanium. It can also be obtained by a known method such as a method of precipitating a hydrolyzate.

In the present invention, the inorganic compound fine particles may be mixed with nail cosmetics in any form such as gel, sol, or powder. The amount of the inorganic compound fine particles to be added to the nail cosmetic is 2 to 80% by weight based on the film component containing these fine particles.
Is preferred. If the amount is less than 2% by weight, there is no effect of the compounding, and if it exceeds 80% by weight, the film becomes brittle. A more preferred amount is 5 to 60% by weight. When the fine particles are blended within the above range, the film hardness is improved, and a film excellent in durability such as abrasion resistance, scratch resistance and impact resistance can be obtained. In particular, those containing inorganic oxide fine particles having a refractive index of 1.8 or more provide a film excellent in gloss as well as improved hardness.

The method for producing the nail cosmetic according to the present invention is not particularly limited, and is produced according to a conventional method. That is, using a suitable stirrer, the film forming agent is dissolved in the evaporating component, and the fine particles and, if necessary, the coloring material are added thereto and uniformly dispersed.

When these fine particles are blended, for example, in the case of an organic solvent type nail cosmetic based on a resin such as nitrocellulose, the surface of the fine particles is previously subjected to a hydrophobic treatment by a known method. Later, it is preferred to mix.

In addition to the organic solvent type, the nail cosmetics include water-type nail cosmetics in which an acrylic resin, urethane resin, polyvinyl alcohol, or the like as a film-forming agent is emulsified and dispersed in water. However, it is also possible to blend the above-mentioned fine particles into the composition and apply it to a water-type nail cosmetic.

[0026]

Preferred embodiments of the present invention will be described below.

Example 1 A dispersion liquid composed of 85% by weight of titanium oxide and 15% by weight of silica and having a hydrophobized complex oxide fine particle monodispersed in butyl acetate (manufactured by Catalyst Chemical Industry Co., Ltd. Lake 6240: average particle size 10 nm, solid content concentration 40
% By weight) to prepare a nail lacquer having the composition shown in Table 1.

[0028]

(1) Nitrocellulose 15.0% by weight (2) Alkyd resin 12.0 (3) Camphor 6.0 (4) Optrake 6240 32.0 (5) Ethyl acetate 24.0 (6) Ethanol 6.0 (7) Toluene 5.0 (8) Colorant appropriate amount

First, nitrocellulose and an alkyd resin were added to the mixture of the solvent and diluent (5) to (7), and then camphor and Optrake 6240 were added with stirring, and finally, a coloring material was added. .

The obtained nail lacquer was applied on an acrylic plate with a 10 mil doctor blade,
The sample was left standing for a while to evaporate the solvent and diluent to prepare a measurement sample, and the gloss (gloss) and pencil hardness of the sample were measured.
The pencil hardness was measured according to JIS K5400.

The gloss (gloss, G) was calculated by the following equation using a digital variable-angle gloss meter (manufactured by Suga Test Instruments Co., Ltd.). G = [(I ₄₅ −I ₁₀ ) / I ₄₅ ] × 100 where I ₄₅ : reflection intensity at a reflection angle of 45 ° at an incident angle of 45 ° I ₁₀ : reflection intensity at a reflection angle of 10 ° at an incident angle of 45 ° Reflection intensity

Table 5 shows the measurement results. Further, as a result of actually applying the nail lacquer to the nail and observing it, a beautiful glossy film was obtained. Even after 3 days from the application, the surface had no scratches and no change.

Example 2 Titanium oxide 5 in which the surface of titanium oxide / silica composite oxide fine particles was coated with zirconium oxide / silica composite oxide
0% by weight, 40% by weight of silica, and 10% by weight of zirconium oxide are composite oxide fine particles, and the other dispersions are the same as in Example 1 (manufactured by Catalyst Chemical Industry Co., Ltd., Optics 6).
240Z) to prepare the same nail lacquer as in Example 1. The obtained nail lacquer was measured and evaluated in the same manner as in Example 1, and the results shown in Table 5 were obtained.

Example 3 Dispersion composed of 85% by weight of titanium oxide and 15% by weight of silica and having a surface of which hydrophobized composite oxide fine particles are monodispersed in butyl acetate (Queen, manufactured by Catalyst Chemical Industry Co., Ltd. Titanic 62-4040: average particle size 40 nm,
The same nail lacquer as in Example 1 was prepared using the solid content concentration of 40% by weight). The obtained nail lacquer was measured and evaluated in the same manner as in Example 1, and the results shown in Table 5 were obtained.

Example 4 Composite oxide fine particles composed of 95% by weight of titanium oxide and 5% by weight of alumina (TTO-55, manufactured by Ishihara Sangyo Co., Ltd.)
(A): average particle size of 50 nm) to prepare a nail lacquer having the composition shown in Table 2.

[0036]

(1) Nitrocellulose 15.0% by weight (2) Alkyd resin 12.0 (3) Camphor 6.0 (4) Composite titanium oxide fine particles 13.0 (5) Butyl acetate 19.0 (6) Ethyl acetate 24.0 (7) Ethanol 6.0 (8) Toluene 5.0 (9) Colorant appropriate amount

First, nitrocellulose and an alkyd resin were added to a mixture of the solvent and diluent (5) to (8), and then camphor and a coloring material were added with stirring. The composite oxide fine particles were added thereto, and the mixture was thoroughly kneaded with three rolls until the fine particles were uniformly dispersed. The obtained nail lacquer was measured and evaluated in the same manner as in Example 1,
The results in Table 5 were obtained.

Example 5 A butyl acetate dispersion of spherical silica fine particles having an average particle diameter of 12 nm (Oscar 6242, manufactured by Katsushi Kasei Kogyo Co., Ltd., solid content concentration: 40% by weight) was used instead of the composite oxide fine particles of Example 1. A nail lacquer was prepared in the same manner as in Example 1 except that it was used. The obtained nail lacquer was measured and evaluated in the same manner as in Example 1, and the results shown in Table 5 were obtained. Also,
As a result of actually applying the nail lacquer to the nail and observing it, the gloss did not change, but even after 3 days from the application, the surface had no scratches and no change.

Example 6 A dispersion in which composite oxide fine particles composed of 85% by weight of titanium oxide and 15% by weight of silica were monodispersed in water (manufactured by Kasei Kasei Kogyo Co., Ltd., Neosanvale PW-3030: average particle size) 30 nm, solid content concentration 30% by weight).
A water-type nail lacquer having the composition shown in Table 1 was prepared.

[0040]

[Table 3] (1) Acrylic resin emulsion 50% by weight (concentration 50% by weight) (2) Neosanvale PW-3030 50 (3) Colorant appropriate amount

The acrylic resin emulsion was mixed with neosan veil and a coloring material, and sufficiently stirred to obtain a nail lacquer. The nail lacquer was measured and evaluated in the same manner as in Example 1.
Was obtained. The nail lacquer was actually applied to nails and observed. As a result, a beautiful glossy film was obtained. Even after 3 days from the application, the surface was not scratched and remained unchanged.

Comparative Example A nail lacquer having the composition shown in Table 4 was prepared.

[0043]

(1) Nitrocellulose 15.0% by weight (2) Alkyd resin 12.0 (3) Camphor 6.0 (4) Butyl acetate 32.0 (5) Ethyl acetate 24.0 (6) Ethanol 6 0.0 (7) Toluene 5.0 (8) Colorant appropriate amount

First, nitrocellulose and an alkyd resin were added to a mixture of the solvents and diluents (4) to (7) to dissolve the resin components, and then camphor and a coloring material were added with stirring. The obtained nail lacquer was measured and evaluated in the same manner as in Example 1, and the results shown in Table 5 were obtained. Also, as a result of actually applying this nail lacquer to the nail and observing it, a slightly cloudy film with poor gloss was obtained.
Many days later, many fine scratches were observed on the nail surface.

[0045]

[Table 5]

[0046]

According to the present invention, by adding an appropriate amount of specific fine particles to a nail cosmetic, the film hardness is improved and the durability such as abrasion resistance, scratch resistance and impact resistance is excellent. A film is obtained. In addition, a nail cosmetic containing inorganic oxide fine particles having a refractive index of 1.8 or more can obtain a film having excellent gloss as well as improved hardness.

Claims (6)

[Claims] 1. A film-forming agent, a solvent and an average particle size of 1 to 1.
A cosmetic for nails, comprising fine particles of an inorganic compound of 00 nm. 2. The nail cosmetic according to claim 1, wherein the inorganic compound fine particles are silica fine particles. 3. The inorganic compound fine particles have a refractive index of 1.8.
The nail cosmetic according to claim 1, characterized in that: 4. The nail cosmetic according to claim 3, wherein the inorganic compound fine particles are inorganic oxide fine particles containing titanium oxide. 5. The inorganic oxide fine particles containing titanium oxide are fine particles obtained by adding hydrogen peroxide to a dispersion containing titanium oxide hydrate to form a uniform aqueous solution, and heating the aqueous solution. The nail cosmetic according to claim 4, characterized in that: 6. The inorganic oxide fine particles containing titanium oxide are made into a homogeneous aqueous solution by adding hydrogen peroxide to a dispersion containing titanium oxide hydrate, and the aqueous solution is mixed with an inorganic compound of an element other than titanium. The cosmetic for nails according to claim 4, wherein the cosmetic is fine particles obtained by heating at a temperature of (5).