JPH0698298B2 - Gel composition and nail polish - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a gel composition and a nail enamel, and in particular to an improvement in the stability thereof over time.

[Background Art] Nail enamels, paints, etc. are formed by dispersing powders of pigments, pearlescent agents, etc. in a solvent, but such powders do not have very good solubility and may separate from the solvent and settle in the container after long-term storage. Therefore, in the past, when forming nail enamels, paints, etc. by dispersing powders in a solvent, a gel composition containing an organically modified clay mineral, in which a clay mineral is modified with an organic solvent to make it swellable, and an organic solvent was produced, and a pigment, etc. was blended into this gel composition.

That is, the clay mineral gel composition is easily changed into a fluid sol by stirring, and when left standing, it returns to a gel again, which is known as thixotropy.

Therefore, by utilizing the excellent thixotropy inherent in clay minerals, the product is gelled during storage to prevent the settling of powders such as pigments, and when in use, the container is shaken to gel the product, resulting in good usability.

However, simply adding an organically modified clay mineral to a nail enamel or the like does not provide sufficient stability, and powder settling and viscosity changes may occur.

Furthermore, the viscosity of the composition changes significantly due to evaporation of the solvent, making it unsuitable for use as a nail polish, paint, etc.

The present invention has been made in view of the above-mentioned problems of the prior art, and its object is to provide a gel composition and a nail enamel that are thixotropic and have good stability over time.

[Disclosure of the Invention] As a result of extensive research conducted by the present inventors to achieve the above-mentioned object, it was discovered that a specific cationic surfactant can impart good dispersion and viscosity stability without impairing the thixotropy inherent in the organically modified clay mineral, and this led to the completion of the present invention.

That is, the gel composition according to claim 1 of the present application comprises one or more cationic surfactants having a propylene oxide chain (hereinafter referred to as a PO chain) and/or an ethylene oxide chain (hereinafter referred to as an EO chain), an organically modified clay mineral,
and a solvent.

The gel composition according to claim 2 is characterized in that it further contains powder.

The gel composition according to claim 3 is characterized in that it further contains an anionic surfactant.

The gel composition according to claim 4 is characterized by containing nitrocellulose.

The nail enamel described in claim 5 is characterized by comprising one or more cationic surfactants having a propylene oxide chain and/or an ethylene oxide chain, an organically modified clay mineral, a solvent, and a pigment.

The configuration of the present invention will be described in more detail below.

Cationic Surfactants Having a PO Chain and/or an EO Chain Examples of cationic surfactants having a PO chain or an EO chain that can be used in the present invention include those having the following general formula:

(wherein X is nitrogen or phosphorus, Y is sulfur, ^M- is chloride, bromide, iodide, nitrite, hydroxyl, acetate, methylsulfate or a combination thereof, _R1 is a hydrocarbon group having 1 to 30 carbon atoms which may or may not have a substituent, at least one of _R2 , _R3 and _R4 has a PO chain and/or an EO chain and has a hydrocarbon group having 1 to 30 carbon atoms which may or may not have hydrogen or a substituent at its terminal, and the remaining Rs are hydrocarbon groups having 1 to 30 carbon atoms which may or may not have the same or different substituent.) The number of moles of PO chains and/or EO chains added is preferably 1 to 50, more preferably 9 to 40.

The content of the cationic surfactant having a PO chain and/or an EO chain used in the present invention is 0.01 to 40% by weight, more preferably 0.05 to 100% by weight, based on the total amount of the gel composition of claim 1.
If it is less than 0.01% by weight, the dispersibility of the clay mineral is poor and good thixotropy cannot be obtained.
If the temperature exceeds this range, the clay minerals will be more likely to aggregate over a long period of time.

When the gel composition according to any one of claims 2 to 5 is a nail enamel, the content of the cationic surfactant having a PO chain and/or an EO chain used in the present invention is 0.01 to 10% of the total amount of the nail enamel.
% by weight, more preferably 0.05 to 5% by weight.

If the content is less than 0.01% by weight, the clay mineral will not disperse well and good thixotropy will not be obtained, whereas if the content exceeds 10% by weight, the clay mineral will be prone to agglomeration over a long period of time.

When the gel composition according to any one of claims 2 to 4 is used as a paint, the content of the cationic surfactant having a PO chain and/or an EO chain used in the present invention is preferably 0.01 to 10% by weight, more preferably 0.02 to 3% by weight, based on the total amount of the paint. If the content is less than 0.01% by weight, the dispersibility of the clay mineral is poor,
Good thixotropy cannot be obtained, and if it exceeds 10% by weight, the clay minerals tend to aggregate over a long period of time.

Organically Modified Clay Minerals Clay minerals that can be used as raw materials for the organically modified clay minerals used in the present invention include water-swelling clay minerals, which are a type of colloidal hydrous aluminum silicate having a three-layer structure, such as natural or synthetic smectite clay minerals such as montmorillonite, saponite, and hectorite.These clay minerals are then substituted with exchangeable cations present between the crystalline layers of these clay minerals, such as organic polar compounds or organic cations, to form organically modified clay minerals.Examples of organic cations include quaternary ammonium salt-type cationic surfactants.Quaternary ammonium salt-type cationic surfactants include those represented by the following general formula: (wherein R ₁ is an alkyl group having 10 to 22 carbon atoms or a benzyl group, R ₂ is a methyl group or an alkyl group having 10 to 22 carbon atoms, R ₃
and _R4 represents an alkyl group or a hydroxyalkyl group having 1 to 3 carbon atoms, and M represents a halogen atom or a methyl sulfate residue, etc.), and examples thereof include dodecyltrimethylammonium chloride, tetradecyltrimethylammonium chloride, hexadecyltrimethylammonium chloride, octadecyltrimethylammonium chloride, arakyltrimethylammonium chloride,
Examples thereof include tetradecyldimethylethylammonium chloride, hexadecyldimethylethylammonium chloride, octadecyldimethylethylammonium chloride, arachidyldimethylethylammonium chloride, ditetradecyldimethylammonium chloride, dihexadecyldimethylammonium chloride, dioctadecyldimethylammonium chloride, benzyltetradecyldimethylammonium chloride, benzylhexadecyldimethylammonium chloride, benzyloctadecyldimethylammonium chloride, and the corresponding bromides, as well as dihexadecylpropylethylammonium methyl sulfate.

Any one or more of these organic cations may be selected as required.

The organically modified clay mineral can be produced, for example, by dissolving the cationic surfactant in ion-exchanged water, adding the clay mineral to the aqueous solution, dispersing it, and then filtering and drying it.

Among these, dioctadecyldimethylammonium salt-modified montmorillonite, benzyloctadecyldimethylammonium salt-modified montmorillonite, and dihexadecyldimethylammonium salt-modified montmorillonite are preferred. Commercially available products include Bentone 27 and 38 (manufactured by National Red Co.). One or more of these organically modified clay minerals can be selected as needed.

The content of the organically modified clay mineral used in the present invention is preferably 1 to 20% by weight, more preferably 4 to 15% by weight, of the total amount of the gel composition according to claim 1.
If the amount is less than 20% by weight, good thixotropy cannot be obtained.
If the temperature exceeds this range, it becomes difficult to perform homodisperse stirring during the production of the gel composition.

Here, the blending ratio of the organically modified clay mineral and the cationic surfactant having a PO chain or an EO chain is closely related to the effect of the present invention.
It is preferable to blend a cationic surfactant having a PO chain or an EO chain in a ratio of about 1/15 to 2. If it is less than 1/15, good stability over time cannot be maintained, and if it exceeds 2, not only will good stability over time not be achieved, but problems such as the surfactant easily peeling off from the nail when used as a nail enamel, for example, will occur.

However, there are still some unknowns regarding the interaction between these two
It is thought that cationic surfactants with PO or EO chains act on the surface of the organically modified clay mineral, and that some of the quaternary ammonium salt-type cationic surfactants between the layers of the organically modified clay mineral are replaced by cationic surfactants with PO or EO chains.

Therefore, in the present invention, the organically modified clay mineral is a PO chain or
This concept also includes those in which a cationic surfactant having an EO chain is trapped between layers.

When the gel composition according to claims 2 to 5 is used as a nail enamel, the content of the organically modified clay mineral used in the present invention is preferably 0.05 to 10% by weight, more preferably 0.1 to 5% by weight, based on the total amount of the nail enamel. If it is less than 0.05% by weight, good thixotropy cannot be obtained, and if it exceeds 10% by weight,
The gloss and durability over time (peeling) will deteriorate.

When the gel composition of any one of claims 2 to 4 is used as a paint, the content of the organically modified clay mineral used in this invention is preferably 0.05 to 10% by weight, more preferably 0.1 to 3% by weight, of the total amount of paint. If it is less than 0.05% by weight, good thixotropy cannot be obtained, and if it exceeds 10% by weight, gloss and durability over time (peeling) become poor.

Examples of the solvent used in the present invention include toluene, xylene, benzene, acetates such as n-butyl acetate, isobutyl acetate, and ethyl acetate, ketones such as methyl ethyl ketone and acetone, alcohols such as n-butanol, isopropyl alcohol, and ethyl alcohol, cellosolves such as methyl cellosolve, butyl cellosolve, phenyl cellosolve, and benzyl cellosolve, and carbitols such as methyl carbitol and butyl carbitol. Any one or more of these solvents may be selected as necessary.

The content of the solvent used in the present invention is preferably 30 to 99% by weight, more preferably 60 to 96% by weight, of the total amount of the gel composition according to claim 1. If the content is less than 30% by weight, the solids concentration of the gel composition will be too high, resulting in poor dispersion and making it impossible to obtain a good gel composition.

The content of the solvent used in the present invention is as follows:
When the gel composition described above is a nail enamel, the total amount of the nail enamel is:
The content is preferably 50 to 90% by weight, more preferably 60 to 80% by weight. If it is less than 50% by weight, the usability is poor, and if it is 90% by weight,
If it exceeds this value, the gloss and durability over time (peeling) will deteriorate.

The content of the solvent used in the present invention is as follows:
When the gel composition is a paint, it accounts for 30 to 100% of the total amount of paint.
The content is preferably 70% by weight, and more preferably 40 to 65% by weight. If it is less than 30% by weight, the usability is poor, and if it exceeds 70% by weight, the gloss and durability over time (peeling) during actual use are poor.

Powder The powder used in the gel composition according to claims 2 to 5 of the present invention may be any powder that is usually blended into nail enamels or paints, and specifically, inorganic powders such as talc, kaolin, sericite, muscovite, synthetic mica, phlogopite, lepidolite, biotite, lepidolite, vermiculite, magnesium carbonate, calcium carbonate, diatomaceous earth, magnesium silicate, calcium silicate, aluminum silicate, barium silicate, barium sulfate, strontium silicate, metal tungstate, silica, hydroxyapatite, zeolite, boron nitride, ceramic powder, etc.; nylon powder, polyethylene powder, benzoguanamine powder, ethylene tetrafluoride powder, styrene-divinylbenzene copolymer powder, distyrenic benzene pinhole polymer powder, microcrystalline cellulosic powder, etc. Organic powders such as rosin, inorganic white pigments such as titanium oxide and zinc oxide, inorganic red pigments such as iron oxide (red ochre) and iron titanate, inorganic brown pigments such as γ-iron oxide, inorganic yellow pigments such as yellow iron oxide and ochre, inorganic black pigments such as black iron oxide and carbon black, inorganic purple pigments such as mango violet and cobalt violet, inorganic green pigments such as chromium oxide, chromium hydroxide and cobalt titanate, inorganic blue pigments such as ultramarine and Prussian blue, pearl pigments such as titanium dioxide-coated bismuth oxychloride, bismuth oxychloride, titanium dioxide-coated talc, fish scale foil, and colored titanium dioxide-coated mica, clay minerals such as bentone, metal powder pigments such as aluminum powder and copper powder, Red No. 201, Red No. 202, Red No. 204, Red No. 205, Red No. 220, Red No. 226, and Red No. 228
Organic pigments such as Red No. 405, Orange No. 203, Orange No. 204, Yellow No. 205, Yellow No. 401 and Blue No. 404, Red No. 3, Red No. 10
No. 4, Red No. 106, Red No. 227, Red No. 230, Red No. 401,
Red No. 505, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow 202
Examples of suitable pigments include organic pigments such as zirconium, barium or aluminum lakes of No. 1, Yellow No. 203, Green No. 3 and Blue No. 1, natural pigments such as chlorophyll and β-carotene, magnesium oxide, magnesium hydroxide, calcium oxide, calcium hydroxide, aluminum oxide, aluminum hydroxide, silica, iron hydroxide, titanium dioxide, low-order titanium oxide, zirconium oxide, chromium oxide, chromium hydroxide, manganese oxide, cobalt oxide, nickel oxide, iron titanate, cobalt titanate, cobalt aluminate, etc., and one or more of these may be selected. The content varies depending on the application of the gel composition, but is usually in the range of 1 to 20% of the total amount of the gel composition.
0.01 to 30% by weight.

Anionic Surfactants: Adding an anionic surfactant to the gel composition of the present invention dramatically improves stability over time. These anionic surfactants can be selected from a wide range of substances as long as they are soluble or dispersible in organic solvents. Typical anionic surfactants include phosphate esters, carboxylic acids, sulfonic acids, and sulfate esters.

Examples of the phosphate esters include those represented by the following formulas (3) to (5).

(In the formula, _R1 , _R2 , and _R3 are the same or different hydrocarbon groups having 1 to 30 carbon atoms, with or without a substituent, or the same or different hydrocarbon groups having at least one PO chain and/or EO chain, with or without hydrogen or a substituent at the end, and having 1 to 30 carbon atoms.) When the PO chain has an EO chain, the number of moles added is preferably 1 to 50, and more preferably 1 to 20.

Examples of carboxylic acids include the following:

Examples include ether carboxylic acids such as polyoxyethylene myristyl ether carboxylic acid and polyoxyethylene cetyl ether carboxylic acid, and N-acyl sarcosinic acids such as lauroyl sarcosinic acid and palmitoyl sarcosinic acid.

Examples of sulfonic acids include the following:

Examples include dialkyl sulfosuccinic acids such as dioctyl sulfosuccinic acid, di-2-ethylhexyl sulfosuccinic acid, and di-n-hexyl sulfosuccinic acid; and alkyl aryl sulfonic acids such as lauryl benzene sulfonic acid and myristyl benzene sulfonic acid.

Examples of sulfate esters include alkyl sulfate esters such as myristyl sulfate and cetyl sulfate, POE cetyl ether sulfate, and POE
Nonylphenyl ether sulfate, etc., can be used in the form of an acid or a salt. The salt is selected from alkali metal salts, alkaline earth metal salts, ammonium salts, and organic amine salts. These salts include, for example, hydrogen,
These include salts with lithium, sodium, potassium, magnesium, calcium, barium, ammonia, and organic amines such as ethanolamine, diethanolamine, triethanolamine, etc., or combinations thereof. The anionic surfactants used in the present invention are selected from the above-listed salts by one or more suitable means.

The content of the anionic surfactant used in the present invention is
When the gel composition according to claim 3 is a nail enamel, the content of the gel composition is preferably 0.01 to 5% by weight of the total amount of the nail enamel. If the content is less than 0.001% by weight, the long-term stability tends to be poor.
If the content exceeds 100% by weight, the durability (peeling) over time will be poor.

The amount of this anionic surfactant is closely related to the cationic surfactant having a PO chain or EO chain, and a good effect cannot be obtained without the presence of the cationic surfactant. The anionic surfactant is preferably blended in an amount of about 1/10 to 1/2 the amount of the cationic surfactant.

The content of the anionic surfactant used in the present invention is
When the gel composition according to claim 3 is a paint, it is preferably contained in an amount of 0.001 to 5% by weight, more preferably 0.001 to 5% by weight, based on the total amount of the paint.
If the content is less than 0.001% by weight, the long-term stability tends to be poor, and if it exceeds 5% by weight, the retention (peeling) over time becomes poor.

Other Components The gel composition of the present invention can be used as a nail polish or paint as it is, or can be used by adding other components to form nail polish or paint. Other components include film-forming agents such as nitrocellulose 1/2 second, nitrocellulose 1/4 second, nitrocellulose 1/8 second, and nitrocellulose 1/16 second, alkyd resins, acrylic resins, polyester resins, sucrose resins, sulfonamide resins,
Examples include resins such as rosin resins, phenolic resins, amino resins, and epoxy resins, plasticizers such as dibutyl phthalate, dioctyl phthalate, tributyl citrate, acetyl tributyl citrate, acetyl triethyl citrate, and camphor, other solvents, ultraviolet absorbers, moisturizers, drugs, fragrances, water-soluble ingredients, etc. Of course, these must be used under qualitative and quantitative conditions that do not impair the object of the present invention.

By being configured as described above, the gel compositions according to claims 1 and 2 of the present invention can reliably prevent deterioration over time, such as settling of powder.

The gel composition according to claim 3 of the present invention has the advantage that it is more stable over time due to the addition of an anionic surfactant.

Here, a method for producing a gel composition can be used, for example, by rolling a mixture of an organically modified clay mineral, soluble nitrocellulose, and a plasticizer through a two-stage heated roll, immersing the resulting chips in a solvent to swell and thoroughly disperse them, and then blending a specific amount of a cationic surfactant having a PO chain and/or an EO chain to produce a gel composition, and then mixing and stirring the resulting composition with powder, or powder and other ingredients.
The chips obtained by passing through the stepped heated rolls are immersed in a solvent to swell and thoroughly disperse the chips to produce a gel composition;
There is also a method in which the composition is mixed with a powder of a cationic surfactant having a PO chain and/or an EO chain, or with other ingredients, and stirred.

The nail enamel of the fourth aspect of the present invention has the advantage of being stable over time, similar to the gel compositions of the first to third aspects. The manufacturing method may be the same as that of the second aspect.

The gel compositions according to claims 1 to 4 of the present invention can be used as nail enamel or paint as they are, or can be used as nail enamel or paint by adding other ingredients, and have the advantage of being stable over time.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an explanatory diagram of the structure of an organic clay mineral, Fig. 2 is an explanatory diagram of the viscosity changes in various states of a nail enamel of the present invention and a conventional nail enamel, and Fig. 3 is an explanatory diagram of the viscosity changes over time of a conventional nail enamel and a nail enamel of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to examples, but the present invention is not limited to these. The blending amounts are expressed in weight percent.

Before going into the examples, the effectiveness test method will be described.

Thixotropy or gel properties Generally, the thixotropy or gel properties of this type of composition are evaluated by measuring the interlayer distance of the clay mineral with X-rays. In this test method, the interlayer distance was also measured with X-rays.
(In the case of quaternary ammonium salt organically modified montmorillonite clay, the interlayer distance in powder form is approximately 18.4 Å, and a gel composition of 40 Å or more is considered good.) Stability over time: Fill the nail polish or paint into a container and observe with the naked eye for precipitation and separation over time.

◎ No precipitation or separation is observed.

○ Slight precipitation and separation are observed.

□ Precipitation and separation are observed.

△ Precipitation and separation are very noticeable.

Gloss of the coating film: Sensory evaluation of the actual use of nail polish or paint.

◎ Very shiny.

○ Slightly glossy.

□ Slightly dull.

△ No gloss.

× No gloss at all.

Durability over time (peeling) (1) In the case of nail beautifiers, the product was evaluated by sensory evaluation after actually applying it to the nails (for 3 days).

◎ Very sticky.

○ Slightly chewy.

□ It doesn't last very long.

△ It doesn't last long.

× It doesn't last very long.

(2) For paints: Sensory evaluation after actual use (6 months).

◎ Very sticky.

○ Slightly chewy.

□ It doesn't last very long.

△ It doesn't last long.

× It doesn't last very long.

Examples 1 to 8 First, the effect of a cationic surfactant on the layer spacing of an organically modified clay mineral was investigated.

That is, clay minerals have a layer structure, and the spaces between each Si-Al layer are charged due to isomorphous substitution, etc. Therefore, in this state, polar solvents can penetrate between the layers, but it is extremely difficult for non-polar solvents such as organic solvents to penetrate.
As shown in Figure 1(A), the exchangeable cations between these layers are replaced with a quaternary ammonium salt-type cationic surfactant. As a result, organic solvents can penetrate between the Si-Al layers. In the case of organically modified clay minerals substituted with the quaternary ammonium salt-type cationic surfactant, the layer spacing is approximately 18.4 Å in the absence of a solvent, and when dispersed in a solvent such as toluene, the layer spacing is 40 Å, as shown in Figure 1(B).
It has been observed to spread further.

Thus, the thixotropy of organically modified clay minerals is caused by the penetration and swelling of organic solvents between the layers.

However, cationic surfactants with propylene oxide or ethylene oxide chains tend to be too non-polar to be used for the organic modification of clay minerals. Furthermore, even if they were treated with organic solvents such as toluene, no expansion of the layer spacing was observed.

Therefore, the present inventors investigated the effect on the layer spacing when a cationic surfactant having a propylene oxide chain or the like is allowed to coexist with an organically modified clay mineral.

That is, the gel composition of claim 1 was produced by a conventional method using a two-stage roll mill with the composition shown in Table 1, and the interlayer distance of the organically modified clay mineral was determined.

The gel composition of claim 1 of the present invention has an interlayer distance of the organically modified clay mineral of 43 to 46 Å, as shown in Table 1, and can sufficiently widen the interlayer distance of the organically modified clay mineral even in the presence of a cationic surfactant having a propylene oxide chain, which makes it difficult to organically modify the clay mineral.

Thus, even in the presence of a cationic surfactant having a PO chain or an EO chain, the organically modified clay mineral is able to maintain sufficient interlayer spacing, suggesting that it has good thixotropy or gel properties.

Examples 9 to 24 Gel compositions were prepared as intermediates for nail enamel or paints according to the formulations shown in Table 2.

The production was carried out by a conventional method using a two-stage roll.

The cationic surfactants in Table 2 are as follows:

The cationic surfactant benzyl octadecyl dimethyl ammonium chloride used as a comparative example has the following structure:

In all of the gel compositions produced in the above Examples, the interlayer spacing of the organic clay mineral was 40 Å or more, and good thixotropy was confirmed.

In addition, Comparative Examples I and II show examples in which benzyl octadecyl dimethyl ammonium chloride was used as the cationic surfactant. These nail enamels of Comparative Examples I and II also had no major problems at the time of production.

Furthermore, when the addition of nitrocellulose is required, such as in nail enamel, it is preferable in terms of dispersibility, etc., to prepare the nitrocellulose at the time of producing the gel composition, as in Examples 9 and 10, rather than adding it at the final product manufacturing stage.

Examples 25 to 38 Next, the gel compositions of Examples 9 to 24 were used to prepare the gels of claims 2 or 3.
A gel composition (nail enamel) was produced and its stability over time was examined.

The formulation and effect data of the gel composition (nail enamel) obtained are shown in Table 3.

As is clear from Table 3, the gel composition (nail enamel) of claim 2 or 3 of the present invention does not cause sedimentation of pigments or pearlescent agents.
The gel compositions containing an anionic surfactant (Examples 26, 28, 30, 32, 34, 36, and 38) were particularly excellent in long-term stability.

On the other hand, nail enamels using Comparative Examples I and II (Comparative Examples III and IV)
The product has poor stability over time, and after about one month, a supernatant liquid begins to form above the gel-like portion. In addition, as the gel performance deteriorates, the sedimentation of pigments, pearlescent agents, etc. is also observed, and it has been recognized that the product value is significantly reduced.

Furthermore, when nail beautification was actually carried out using Comparative Examples III and IV, the gloss of the coating film was poor, and furthermore, the coating film easily peeled off from the nail, which meant that it had poor durability over time (resistance to peeling off from the nail).

Therefore, as is clear from Comparative Example III, benzyl octadecyl dimethyl ammonium chloride, which is also a cationic surfactant, not only has no effect of improving stability over time, but also significantly reduces usability. Therefore, it can be understood that the cationic surfactants used in the present invention do not all exhibit the same effect, but that cationic surfactants having a propylene oxide chain or an ethylene oxide chain specifically improve stability over time.

Furthermore, while Examples 26, 28, 30, 32, 34, 36, and 38 show that the presence of an anionic surfactant further improves the stability over time, it is understood that in Comparative Example IV, in which an anionic surfactant was merely blended, the stability over time and usability were significantly reduced, and in fact had a negative effect.

Therefore, it is suggested that the presence of a cationic surfactant having a PO chain or an EO chain is essential to obtain the effect of an anionic surfactant in improving stability over time.

Furthermore, a test to confirm usability over time was carried out as shown in Table 4 below.

That is, the nail enamel of Example 26 and a conventional general nail enamel were applied twice to 10 plastic nails, and this was counted as one application. The following changes in usability are shown as a result of applying the following number of times.

As is clear from Table 4, the number of times the conventional product is used is
The viscosity of the liquid increases and usability deteriorates after about 11 uses. In contrast, even after 15 uses in Example 26, usability remained almost the same as at the beginning of use.

Such improvement in usability is also supported by FIGS. 2 and 3.

2 shows the viscosity change in each aspect of the nail enamel of Example 26 and a conventional product, with (A) in the figure showing the viscosity of the nail enamel of Example 26 one hour after preparation, which is approximately 800 cps. In contrast, (B) in the figure shows the viscosity of the example product in which the solvent was evaporated so that the solid content increased by 3%, and it can be seen that although the viscosity increased, it was kept to around 1200 cps.

Furthermore, the viscosity of the example product after one week of trial production is shown in (C) of the same figure, and shows a viscosity that is almost the same as that of (B) above.

On the other hand, Figure 1(D) shows the viscosity of the conventional product one week after production, which is approximately 1200 cps. In contrast, Figure 1(E) shows the conventional product with solvent evaporation corresponding to (B) above, and it can be seen that the viscosity has risen to about 1500 cps. Furthermore, Figure 1(F) shows the viscosity of the prototype corresponding to (C) above one week after production, which has risen to about 3000 cps.

Furthermore, Figure 3 shows the change in viscosity over time of the example product and the conventional nail enamel product. The viscosity of the example product initially increases from about 800 cps to about 1200 cps after one week, but there is almost no change thereafter.

In contrast, the viscosity of the conventional product increases to more than twice its original value in about one day, and continues to increase for about two weeks. Moreover, after two weeks, the viscosity is more than three times the original value.

Therefore, when considering nail polish as a product, it is expected that the quality would change significantly depending on the time it is displayed, suggesting that it would be extremely difficult to control.

From the above, it can be seen that the example product and the conventional product have almost the same viscosity immediately after the prototype, but when the solvent is evaporated, the viscosity of the conventional product tends to increase slightly, and furthermore, one week after the prototype, the viscosity of the example product is almost the same, while the viscosity of the conventional product increases significantly, resulting in a significant deterioration in usability.

As shown in Table 4 and Figure 2 (B), the nail enamel of this example shows almost no change in viscosity even when the solvent is reduced (when the solid content is increased). Therefore, even when the solvent gradually evaporates during continued use, a nearly constant viscosity is maintained, ensuring good usability.

On the other hand, as shown in Figs. 2(C), (F) and 3,
With conventional products, the viscosity changes drastically just by being left alone, and for example, in the case of nail enamel, the usability can deteriorate because the time between production and actual use is uncertain. However, with the product of this embodiment, the viscosity hardly changes even one week after trial production, so it is possible to provide a nail enamel that always has consistent usability, even if the time between production and actual use changes significantly.

Examples 39 to 46 The gel compositions of Examples 9 to 24 were used to prepare gel compositions (paints) according to claims 2 and 3. The preparation method was conventional. The formulations and performance data of the obtained gel compositions (paints) are shown in Table 5.

As is clear from Table 5, the gel compositions (paints) of claims 2 and 3 of the present invention showed no sedimentation of the pigment or pearlescent agent, were excellent in stability over time, and had good coating film properties. In particular, gel compositions 40, 42, 44, and 46, which contained an anionic surfactant, showed excellent results.
Furthermore, it had excellent long-term stability.

Examples 47 and 48, Comparative Examples V and VI Table 6 shows examples and comparative examples of the gel compositions (nail enamel) according to claim 2 or 3 of the present invention. The gel composition numbers in the table are gel compositions obtained by the compositions and manufacturing methods shown in Table 7.

The mixture consisting of the above steps (1) to (5) was passed through a two-stage heated roll, and the chips obtained were immersed in the mixture to expand and disperse thoroughly to produce a gel composition.

In addition, in gel composition preparation No. 3, further additives were added and dispersed.

As is clear from Table 6, the gel compositions (nail enamel) of claims 2 and 3 of the present invention showed no sedimentation of pigments, excellent stability over time, and good coating properties. In particular, gel composition 48 of claim 3, which contains an anionic surfactant, showed even better long-term stability.

Example 46, Comparative Example VII Table 8 shows examples and comparative examples of the gel composition (paint) of claim 3 according to the present invention. Note that gel composition No.
is a gel composition obtained by the composition and production method shown in Table 7.

As is clear from Table 8, the gel composition (paint) of claim 3 of the present invention showed no sedimentation of pigments or the like for more than two years, exhibited excellent stability over time, and also had good coating film properties.

In contrast, in Comparative Example VII, precipitation was observed after one year, and the stability over time was not very good.

Continued from the front page (72) Inventor: Mikio Nakano 1-6-7 Misono, Sagamihara City, Kanagawa Prefecture (56) References: JP 58-144312 (JP, A) JP 61-286213 (JP, A) JP 59-48659 (JP, B2)

Claims (5)

[Claims] 1. A gel composition comprising one or more cationic surfactants having a propylene oxide chain and/or an ethylene oxide chain, an organically modified clay mineral, and a solvent. 2. A gel composition according to claim 1, further comprising a powder. 3. A gel composition according to claim 1 or 2, further comprising an anionic surfactant. 4. The gel composition according to claim 1, further comprising nitrocellulose. 5. A nail enamel comprising one or more cationic surfactants having a propylene oxide chain and/or an ethylene oxide chain, an organically modified clay mineral, a solvent, and a pigment.