KR19990022913A - Water Soluble Nail Lacquer - Google Patents

Abstract

A water soluble nail lacquer comprising an alcohol soluble nitrocellulose, a plasticizer, an active solvent for dissolving nitrocellulose, a soluble crosslinkable solvent with nitrocellulose, and an active solvent to form a water soluble lacquer solution.

Description

Water Soluble Nail Lacquer

The present invention relates to a nail lacquer, more specifically a lacquer based on water soluble nitrocellulose.

Known nail lacquers used nitrocellulose film formers which dissolve in esters in solvent systems based on very high activity esters. Generally, the active solvent system is oily and incompatible with water. Water can only be incorporated into the lacquer using an emulsifier. In fact, the presence of water in known nail lacquers has generally been considered an impurity because it becomes a cloudy or opaque lacquer.

Water soluble impurities are typically present at levels of about 1% moisture content. If the water as an impurity is in a higher level, for example, in the range of 10%, it cannot be used as a nail lacquer, and the drying time is also delayed. Therefore, in standard fingernail varnish formulations, it is not desirable if water is present in trace amounts or more.

US-A-5284885 describes a water soluble nitrocellulose emulsion composed of water and lacquer phases. In addition, US-A-5102654 describes an emulsion composition based on nitrocellulose composed of a water phase and a lacquer phase.

US-A-4402935 describes a nail lacquer consisting of a combination of nitrocellulose and polyvinyl butyryl resin, water and urea to improve the wettability of the lacquer.

US-A-4158053 describes nail lacquers composed of water-soluble emulsion polymers on behalf of nitrocellulose.

Compositions based on the water soluble emulsions of the prior art document are unsatisfactory because of the undesirable and poor product due to the possibility of phase separation over time.

In general, color nail lacquers require antisettling agents or thickeners to suspend solid components. The most widely used nail lacquer known in the art uses a clay thickener such as benton (trade name of montmorinite) which is dispersed in water such as toluene in an insoluble volatile solvent.

Toluene is one of the most toxic solvents in nail lacquer formulations in recent years, and the solvent specification defines it as a toxic solvent. However, bentonite antisettling agents are preferred because of their high compatibility with highly active ester solvent systems.

Nevertheless, bentonite has some drawbacks, not their coating, which is disgusting to some users as they are derived from animals.

Thus, standard nail lacquers require significant amounts of organic components that are volatile and toxic. In general, organic components are used as solubilizers to dissolve nitrocellulose and clays in lacquers.

In the known nail lacquer, due to the high proportion of organic components, the manufacturing process is difficult and high production cost in consideration of safety. Moreover, the lacquer obtained is flammable and highly toxic. In addition, because of the use of volatile organic components, nail lacquer formulations may allow the user to release an unpleasant odor.

Since the lacquers in the prior art are not compatible with ordinary water, it is possible to incorporate oily organic enhancers in very small amounts, especially without replacing all or functionally the same amount of nail enhancers which are soluble in water without emulsifiers. . For example, lacquers that frequently appear in prior art data include non-volatile organic ingredients that give off unpleasant side effects such as formaldehyde used as a strength enhancer for nails.

Briefly, many studies have been conducted to prepare water-soluble nail lacquers to overcome the above-mentioned disadvantages of water-insoluble formulations, but the resulting emulsions have poor rheological properties and, as noted above, separate lacquers Is obtained.

It is an object of the present invention to provide a water-soluble nail lacquer composed of a high content of water and a base solution which reduces the amount of volatile organic components and reduces animal components.

Another object of the present invention is to provide a lacquer for nails containing a suspension system that does not contain a suitable clay in an aqueous solution.

The above objects can be achieved by providing a nail lacquer based on cellulose having a water content of 1 to 20%. Cellulose consists of nitrocellulose dissolved in alcohol.

Preferably the water content is 8-20%. Suitably the composition consists of one or more alcohols. Preferred compositions consist of 8-50% ethanol, more preferably 10% or more ethanol.

Suitable compositions contain antisettling agents, preferably silicate antisettling agents, more preferably hydrophobic silicates. In particular, the composition of the present invention is free of clay by removing animal raw materials. Thus, the composition is free of toluene by minimizing the content of harmful organic components.

The composition of the present invention contains 1 to 20% water and a high content of ethanol.

In particular, the present invention seeks to provide a water-soluble nail lacquer comprising an alcohol soluble nitrocellulose, a plasticizer, an active solvent that dissolves nitrocellulose, a crosslinking solvent that dissolves with nitrocellulose, and water to form an active solvent and a water-soluble nail lacquer solution. . Preferably the active solvent is an ester, more preferred is an acetate ester selected from the group consisting of ethyl acetate and butyl acetate or mixtures thereof.

Suitably, the crosslinking solvent consists of an alcohol. Advantageously are alcohols selected from isopropyl alcohol, methoxypropanol, ethanol and mixtures thereof. Alternatively or additionally, the crosslinking solvent consists of propylene glycol monopropyl ether. Preferred nail lacquers further contain anti-settling agents based on the substrate, not clay. More preferred antisettling agent is hydrophobic fumed silica. Suitably, the nail lacquer contains an additional nail enhancer.

The invention also relates to 7-25% alcohol soluble nitrocellulose, plasticizer for nitrocellulose, 20-40% active solvent for dissolving nitrocellulose, 10-50% crosslinking solvent and at least 1% water, nitrocellulose It is to provide a water-soluble nail lacquer consisting of a crosslinking solvent, an active solvent and water. Suitably the lacquer consists of 20-40% of the crosslinking solvent. Preferably, the lacquer for nails consists of 1 to 20% of water.

Nitrocellulose must have a viscosity to form a primary film, to produce a cosmetic nail lacquer composition that is easy to flow, and to form a film that is sufficiently glossy. Nitrocellulose should be completely neutral. Nitrocellulose compositions, which are not specific, can damage nails and destroy pigments used in lacquers of colored nails.

The solubility properties of nitrocellulose are determined by their nitrogen content. Alcohol soluble nitrocellulose is used in the nail lacquer of the present invention. The alcohol soluble nitrocellulose preferably contains 10.9 to 11.7% nitrogen.

Particularly preferred alcohol soluble nitrocelluloses are AH25 / IPA from Hagedorn and DHL8 / 13 from ICI.

The alcohol soluble nitrocellulose used in the nail lacquer of the present invention is to provide a nail lacquer that is flexible, glossy, and has good plastic properties.

Alcohol soluble nitrocellulose of the nail lacquer of the present invention utilizes a lower concentration of active solvent than ester soluble nitrocellulose is available. The amount of alcohol crosslinking solvent used is measured in one part by the content of nitrogen in nitrocellulose, and the solubility of the alcohol decreases as the level of active solvent required increases.

The combined use of the crosslinkable solvent system and alcohol soluble nitrocellulose of the present invention results in a nail lacquer that reduces the active organic solvent content and improves film forming properties.

The active solvent system of the present invention constitutes an ester solvent. Suitable esters include ethyl acetate and butyl acetate. In general, esters represent 20-40% of the composition.

The plasticizer is suitably present in the composition by weight of about 5-10% by weight. Suitable plasticizers are dibutyl phthalate, kempfer, sucrose acetate, isobutylate and castor oil.

Preferred crosslinkable solvents are alcohols. Suitable alcohols used in the present invention are alcohols that are compatible with alcohol soluble nitrocellulose. for example. Such alcohols are methoxypropanol, ethanol and isopropyl alcohol and mixtures thereof. Alternatively or additionally, propylene glycol monopropyl ethers may also be used.

Alcohols obtained from natural sources such as sugar cane can also be used in the water-soluble nail lacquers of the present invention. Fermented alcohols obtained from natural sources are often preferred over alcohols obtained from crude oil sources that are not environmentally friendly.

As described above, in the present invention, the amount of alcohol is largely measured by the alcohol solubility of nitrocellulose, but the amount of the active organic solvent system is reduced. Suitably alcohol is at least 10%, preferably 10-50%, more preferably 20-40%. In general, the amount of crosslinkable solvent can also be determined by the flow characteristics of the final nail lacquer.

Nail lacquer solution of the present invention is composed of a high content of water. In general, for nail lacquers, the total content of water is 1 to 20%, preferably 4 to 12%, and most preferably 7.5 to 8.5% by weight of the composition. Water may be added separately to the composition or may be present as impurities or solvent in other components of the lacquer. Alcohols, for example.

The optimum amount of water added to the nail lacquer solution can again be measured in part by the alcohol solubility of the nitrocellulose and the amount of the individual active and crosslinked solvents.

Plasticizers are also generally included in nail lacquers based on nitrocellulose. Suitable plasticizers are castor oil, kempfer, crude castor oil, dibutyl phthalate and tricresyl phosphate. The plasticizers can be used alone or in combination with each other.

Generally, the nail lacquer of the present invention is clear or transparent.

Nail lacquers of the present invention may also contain anti-settling agents, not clays, to suspend solid components in the lacquer solution.

Suitable antisettling agents include silicates such as hydrophobic or fumed silica. Preferred silicate settling agents have a surface area of 110 to 260 m ³ / g, preferably 110 +/- 20 m ³ / g. The particle size is in the range of 7-18 nm, preferably 12-18 nm, and most preferably 16 nm. An example of a suitable antisettling agent is Aerosil R872 under the trade name produced by Degussa.

Hydrophilic silicates are preferred as hydrophobic silicates because this function is a deglossant, which inhibits dispersion and reduces gloss.

In the nail lacquer compositions of the prior art, silica anti-settling agents exhibit a degloss effect and are not preferred, and are difficult to disperse due to the insoluble solvent for water of recent water-insoluble nail lacquer formulations. Thus, it was found that the suspension effect of silica was undesirable and the clay system was used for the nail lacquer formulation.

However, the water-soluble nail lacquer of the present invention uses a low viscosity viscosity silicate incorporating a greater amount of solids in the nail lacquer composition as compared to the nail lacquer compositions of the prior art. Clay anti-settling agents appear in high viscosity products that require low solids such as, for example, low content nitrocellulose, plasticizers or pigments.

Thus, the suspension system used in the nail lacquer of the present invention uses high concentrations of nitrocellulose to enhance gloss and thicken the film of the nail.

The nail lacquer of the present invention also contains a second resin. Suitable secondary resins compatible with nitrocellulose are mostly resins based on benzoin, Damar (trade name), ester gum, Pontianac Sandara, shellac and alkyl, acrylates and methacrylates as natural resins. And synthetic resins such as polyester resins. Polyester resins are preferred as secondary resins. Other secondary resins include nylon acrylate copolymers and nylon / acrylate / acrylonitrile copolymers.

Nail enhancers include, for example, soluble additives suitable for water, such as ingredients that promote nail growth such as panthenol, fortifying nails such as glyoxal and other nail enhancers such as calcium, UV absorbers, vitamins and wetting agents. It can be easily incorporated into the lacquer. Nail enhancers can generally be incorporated into nail lacquers at very low concentrations, typically 0.0001 to 1%.

Water soluble dyes may also be added to the nail lacquer formulations of the present invention to improve the color of the lacquer.

In the present invention, the advantage of the solvent system of the nail lacquer is that of the prior art opaque emulsions, i.e. transparent solutions which do not occur even after standing for a long time compared to the solutions in which the active solvent system, the crosslinkable solvent and water are produced. It is done.

The solvent system of the present invention is compatible with alcohol soluble nitrocellulose when compared with nitrocellulose dissolved in esters of the prior art.

Moreover, alcohol soluble nitrocellulose exhibits high flexibility, plasticity and gloss in the final product.

An exemplary advantage of the present invention is to provide a nail lacquer which contains a high concentration of water and is a solvent in the form of a solution. Crosslinked solvents or solutions are provided as alcohols in water and the active solvent for nitrocellulose. Thus, the nail lacquer of the present invention is not in the form of an emulsion and does not separate during standing.

The provision of crosslinkable solvents and the use of alcohol soluble nitrocellulose reduce the volatile organic components of the common active solvent systems required for the compositions, for example, for nail lacquer compositions.

The hydrocarbon component is replaced by a high content of alcohol that functions as a crosslinkable solvent in the nail lacquer of the present invention.

The nail lacquer produced in the present invention is transparent with high concentrations of water which does not result in sagging in the case of emulsions in the prior art.

Nail lacquer compositions in the prior art utilize nitrocellulose which is dissolved in a high concentration of ester for elution. However, the combination of alcohol soluble nitrocellulose and alcohol crosslinked solvents in the present invention significantly reduces the amount of organic solvent required.

Compared to the nail lacquer in the prior art, the nail lacquer of the present invention reduces the amount of volatile organic components required by 20%. Therefore, the nail lacquer of the present invention, in addition to the aesthetic aspect, is to provide consumers and production profits in a more environmental aspect than the formulation of the prior art.

The crosslinkable solvent system of the present invention uses a suspension system that is not based on clay.

An advantage of the preferred silica based suspending agent is a low viscosity suspending agent which can be incorporated in higher content than bentonite or hectorite in nail lacquer compositions.

Moreover, the use of the silica based suspension system eliminates the need to use the toluene type solvents required for the clay, and thus, the nail lacquer of the present invention further increases the environmentally beneficial advantages.

A solution that does not contain a clay is a low viscosity which indicates a solid content of more than 30%, preferably 33 to 38%, as opposed to containing 25-30% solids in known nail lacquers. The total solvent content combined with higher solids with higher solids in the new system of the present invention is about 58%, although it is 72% in known nail lacquers.

Water is insoluble in the lacquers of the prior art, so the drying time in such a system proceeds slowly.

Surprisingly, the addition of water to the nail lacquer of the present invention revealed that, as expected in the formulation of the known art, it does not irreversibly affect the drying time.

It has been found that the nail lacquer of the present invention does not reduce moisture loss from the nail, and improves the flexibility of the nail and also the strength of the nail. The effect of moisture is believed to maintain flexibility and reduce shedding in the nail structure.

High concentrations of water in the nail lacquer are believed to degrade the water soluble nail enhancer in nail lacquer such as glyoxal.

The present inventors do not wish to be bound by any theory, but propose to be an influence by moisture present in the nail lacquer of the present invention due to the blocking of water molecules in the film lattice by alcohol soluble nitrocellulose.

Blocked moisture molecules show the effect of moisture. Moreover, it is believed that blocked water molecules can migrate to nails effectively through a nail enhancer, such as a water solubility enhancer such as glyoxal.

In addition, the high degree of flexibility exhibited by the nail lacquer of the present invention is also the result obtained from the lattice produced in drying.

The nail lacquer of this invention does not contain formaldehyde. Formaldehyde causes unwanted side effects such as inflammation, lumps around the skin, or hardening. Moreover, formaldehyde has dangerous toxic effects, especially on nerve cells and capillaries of the skin.

The present invention, consisting of an alcohol / water soluble nail varnish formulation, uses a high concentration of glyoxal, which increases the strength of the nail, unlike formaldehyde. It has been found that glyoxal in the cosmetic composition of the present invention improves the strength of nails by adding about 0.0001 to 1% to the preparation of nail lacquers based on water-soluble nitrocellulose. Thus, the use of high content of glyoxal in an aqueous solvent system achieves the desired effect of glyoxal in the formulation.

The technical features of the present invention will be described in the following examples.

Examples

A typical nail lacquer composition based on the known nitrocellulose comprises the following ingredients.

Nitrocellulose: (7-25%, more preferably 10-18%, most preferably 12-16%)

Secondary resin: (2 to 8%) such as toluene sulfonamide, formaldehyde resin, acrylate copolymer, polyester.

Plasticizer: (2-8%) such as dibutyl phthalate, camphor, sucrose acetate, isobutylate, castor oil.

Solvent: (55-80%, more preferably 65-80%) For example, toluene, butyl acetate, ethyl acetate, isopropyl alcohol.

Other components optionally include the following.

Thickeners and Suspending Agents: (0.05-5%) such as organically modified smectite hectoride, bentonite, montmorinite clays.

UV absorbers: for example, dromethazole, benzophenone.

Color: for example, iron oxide, titanium oxide, ferric ferrocyanide and D C Yellow No. 5 Aluminum Lake and D C Red No. Organic rakes like 6 barium lake.

Decorative materials: for example titanium coated with mica, bismuth oxychloride, Mylar Giltters.

A typical embodiment is as follows.

Comparative Example 1

(Glossy Blend for Nails in Advanced Technology)

Butyl Acetate 24-40%

Toluene 16-30%

Ethyl acetate 4-12%

Isopropyl alcohol 2-6%

Butanol 2-6%

Dibutyl phthalate 4-12%

Nitrocellulose 8-20%

Toluene Sulfonamide Formaldehyde Resin 4-12%

Acrylate copolymer 0.05-1%

UV absorber 0.1% or less

Kemper 0.4-1.5%

Stearalconium hectorite 0.4-1.5%

Titanium Coated Mica 1.5-2.5%

D C Yellow No. 5 Aluminum Lake 0.02 to 0.1%

D C Red No. 6 barium lake 0.01-0.1%

Viscosity (cps): Initial 3000 to 3600

High shear 800 to 1000

Recovery period 1500-2000

Moisture content: 0.5% or less

Solid content: 26 to 28%

The components were mixed together in a known manner to form a standard nail varnish with a low moisture content, a high volatility organic content and a low solids content.

Example 2

Color nail lacquer of the present invention

ingredient weight(%) function Ethyl alcohol 20-40 menstruum Ethyl acetate 10 to 20 menstruum Nitrocellulose 10 to 20 Primary film former Butyl acetate 10 to 20 menstruum Dibutyl phthalate 5 to 10 Plasticizer Polyester resin 5 to 10 Secondary resin Deionized distilled water 5 to 10 Isopropyl Alcohol 5 to 10 menstruum Silicon oxide 1 to 5 Suspension Kemper 0.1 to 1 Plasticizer Di-isopropyl adipate 0.1 to 1 Plasticizer Polysorbate 20 0.1 to 1 Silicate actives 2,4-dihydroxybenzophenone <0.1 UV absorbers Titanium coated with mica 1 to 2 D C Yellow 5 Aluminum Rake 0.01 to 1 D C Red 6 Barium Lake 0.01 to 1 Iron oxide 0.01 to 1 Water solubility Glyoxal 0.01 to 1 Water solubility D Panthenol 0.01 to 1 Water solubility Lactic acid 0.01 to 1 Water solubility Tocopheryl acetate 0.01 to 1 activation Silk hydrolysate 0.01 to 1 Water solubility Calcium Panthenoate 0.01 to 1 Water solubility Viscosity: Initial 1000-1400 (cps) Viscosity: High Shear 400 to 600 (cps) Viscosity: Recovery Period 900 to 1200 (cps) Moisture content 7-10 Solid content 32 to 38

The above components were mixed as follows.

1. Dibutyl phthalate, butyl acetate, ethyl acetate, half of ethanol, polyester resin and isopropyl adipate were added to a mixing vessel made of stainless steel. The mixing was started and the following ingredients were added with proper mixing.

Nitrocellulose, kempfer, ultraviolet absorbers.

The mixture was stirred until completely dissolved.

Silica was added for optimum dispersion or to obtain optimum gloss in high speed shear mixing or closed bead mill systems.

2. The remaining alcohol, deionized distilled water and polysorbate 20 were blended and slowly added to face 1 with mixing so that no water was immersed in nitrocellulose.

3. Add the remaining ingredients and stir until homogenized.

Example 3

Transparent Nail Lacquer

ingredient weight(%) Ethyl alcohol 20-40 Ethyl acetate 10 to 20 Nitrocellulose 10 to 20 Butyl acetate 10 to 20 Dibutyl phthalate 5 to 10 Polyester resin 5 to 10 Deionized distilled water 5 to 10 Isopropyl Alcohol 5 to 10 Kemper 0.1 to 1 Di-isopropyl adipate 0.1 to 1 Polysorbate 20 0.1 to 1 2,4-dihydroxybenzophenone <0.1 Glyoxal 0.01 to 1 D Panthenol 0.01 to 1 Lactic acid 0.01 to 1 Tocopheryl acetate 0.01 to 1 Silk hydrolysate 0.01 to 1 Calcium Panthenoate 0.01 to 1 Viscosity 250-350 (cps) Moisture content 7-10 Solid content 32 to 38

The above components were mixed as follows.

1. Dibutyl phthalate, butyl acetate, ethyl acetate, half of ethanol, polyester resin and isopropyl adipate were added to a mixing vessel made of stainless steel. Start mixing and add the following ingredients with proper mixing.

Nitrocellulose, kempfer, ultraviolet absorbers.

The mixture was stirred until completely dissolved.

2. The remaining alcohol, deionized distilled water and polysorbate 20 were blended and slowly added to face 1 with mixing to prevent water immersion in nitrocellulose.

3. Add the remaining ingredients and stir until homogenized.

Example 4

A typical nail lacquer formulation of the present invention is as follows.

ingredient weight % Propylene Glycol Monopropyl Ether 27.00% Ethyl acetate 15.00% Nitrocellulose 14.00% Butyl acetate 15.00% Dibutyl phthalate 6.00% Deionized distilled water 8.00% Isopropyl Alcohol 5.5% Polyester resin 6.0% Normal-butanol 1.1% Kemper 1.0% Di-isopropyl adipate 0.5% Polyoxyethylene 20 Sorbitan Monolaurate 0.5% Various ingredients including glyoxal, tocopheryl acetate, 2,4-dihydroxybenzophenone 0.4% Potassium hydroxide 1/4 dyes 1/4 Solid content 31-34% moisture 6 to 8% importance 0.97-0.99 color Standard flash point 6 ℃ Viscosity 270 to 330 cps pH 6.5-6.8

Example 5 Nail Strengthening Enhancement Characteristics

In order to examine the nail strengthening characteristics, the lacquer of Example 4 was compared with the lacquer of Comparative Example 1, and the experiment described below was performed.

The purpose of this experiment is to measure the intensity before and after treating the lacquer of Example 4 and the lacquer of Comparative Example 1 to human nails.

The toughness of the human nail clipper was measured in vitro as an Instron Tensile Tester at adjusted temperature and relative humidity conditions.

Materials and methods

The product to be tested is the lacquer of Comparative Example 1 and the lacquer of Example 4.

Human nails were cut transversely into rectangular bar models 7 mm long and 3 mm wide. Each nail was provided with its own manipulation. The sample size is 15 nails per product.

The test method (Test Method TR-170) was applied to the universal testing machine (Instron Model 4501) to apply a load to deviation (stress / strain) curve for each nail. The method used is the Bjorksten Flexure Apparatus, which is essentially a small three-point refraction device [Maloney MJ, Paquetta EG and Shansky A, The physical properties of fingernails, 1. Apparatus for physical measurements, J. Sox. Cosmet. Chem., 28: 415-425 (August 19770). Data were collected and calculated by computer Toughness or strength of each nail was determined by measuring the slope of the stress / strain curves. The atmosphere and relative humidity were adjusted to 20%.

The strength of each nail was measured after paralleling the test conditions for 48 hours. One coat of each product was then applied to the upper and lower surfaces of each nail with a brush, dried for 18 hours and then measured for strength.

Data is recorded in the table and shown in the attached graph. Table 1 shows the actual toughness or strength before and after treatment, while Table 2 and Figure 1 show the percent change as treatment function.

conclusion

When the lacquer of Comparative Example 1 was applied, the strength of the nail was increased by 15%. As a result of applying the lacquer of Example 4, the strength of the nails increased by almost two times, showing an intensity of 28.8%. The effect was statistically significant at the 90% confidence interval.

Enamel effect for manicure at nail strength gram / cm of 15 average nails apply Comparative Example 1 Example 4 I'm 11652.1 10739.6 after 12928.0 13276.2

Effect of nail polish enamel on change of% nail strength from mean + 90% confidence interval apply Comparative Example 1 Example 4 One + 15.0 ± 5.5 + 28.8 ± 5.1

Example 6 Influence of Humidity

The humidity characteristics of the formulations tested in Example 5 were compared and followed the experimental design as follows.

One hour before the experiment, the skin temperature (37 ° C.) of the human skin was adjusted to stand at 20% relative humidity. These conditions were kept constant during the test. Once the desired temperature was obtained, three glass beakers (250 ml) were filled with water (200 ml). Cover each beaker with water and the first beaker is a solvent without any substance (control) to be tested, the second beaker is covered with a solvent-resistant object cast with the nail polish enamel film to be tested. The beaker is covered with a cast enamel object with a thin layer of control enamel. Each beaker weighed. If the weight of the manicure enamel cast on the solvent-resistant object is heavier than the control, add a few drops of water to the control beaker until all beakers have the same weight. Three covered beakers were placed on a bench / desk and placed in a controlled laboratory for 24 hours. Covered beakers were evaluated gravimetrically at 0, 4, 8, 12, 16 and 24 hours.

The transfer rate of humidity through the enamel film for nail polish was confirmed as a result of water evaporation by weight reduction of the apparatus.

If the speed decreases by 20% as a solvent-resistant object cast with the nail polish enamel film, it can be determined that less humidity is lost from the nail.

The experiment was carried out at 37 ℃ and 30% relative humidity.

Vessel tare weight at t = 0 hours (g) t = tare weight at 24 hours (g) Humidity Loss Weight Due to Evaporation (g) 1 (control) 387.200 377.835 9.365 2 (Example 4) 386.475 384.675 1.8 3 (comparative example 1) 387.390 384.380 3.01

Table 3 shows a remarkable improvement in the humidity characteristics of the nail lacquer of the present invention.

Claims (12)

A water-soluble nail lacquer characterized by consisting of an alcohol soluble nitrocellulose, a plasticizer, an active solvent for dissolving nitrocellulose, a soluble crosslinkable solvent with nitrocellulose, and an active solvent to form a water-soluble nail lacquer solution. The water-soluble nail lacquer according to claim 1, wherein the active solvent is an ester. 3. The water-soluble nail lacquer according to claim 2, wherein the ester is an acetate ester selected from the group consisting of ethyl acetate and butyl acetate or mixtures thereof. The water-soluble nail lacquer according to any one of claims 1 to 3, wherein the crosslinking solvent consists of alcohol. The water-soluble nail lacquer according to claim 4 wherein the alcohol is selected from the group consisting of isopropyl alcohol, methoxypropanol, ethanol or mixtures thereof. The water-soluble nail lacquer according to any one of the preceding claims, which further comprises a non-clay based suspending agent. The water-soluble nail lacquer according to claim 6, wherein the suspending agent is hydrophobic fumed silica. The water-soluble nail lacquer according to any one of the preceding claims, further comprising a nail enhancer. 7% to 25% alcohol soluble nitrocellulose, plasticizer for nitrocellulose, 20% to 50% active solvent for dissolving nitrocellulose, 10% to 40% cross-linked solvent with 1% or more water, nitrocellulose Water-soluble nail lacquer, characterized in that consisting of a crosslinkable solvent, an active solvent and water. The nail lacquer according to claim 9, which contains 1% to 20% of water. The nail lacquer according to claim 9 or 10, which contains 20% to 40% of a crosslinking solvent. The nail lacquer according to claims 9 to 11, which contains 4% to 12% of water.