JP2014227413A - Topcoat composition and method for use thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that in recent years, artificial nails used for coating or adding length to nails comprises a reactive or non-reactive polymer or a mixture composition thereof and do not have electrical conductivity and consequently when one wears the artificial nails on the one's own nails, it is impossible for the one to perform touch event operation by the one's own nail or the artificial nail in a portable terminal, a portable music reproducing apparatus, a digital camera, a portable display device, and a personal computer that deal with touch events.SOLUTION: In one embodiment of the present invention, topcoat, in which a novel effect and function are created, is provided. In the present invention, topcoat that makes a keratinous matter surface of human function as a conductor by containing at least one particle in a composition of the topcoat and by making content of the particle be equal to or more than a certain critical point.

Description

      The present invention relates to a composition for topcoat, and particularly relates to a composition having conductivity, but is not limited thereto.

      In recent years, artificial nails used for coating or adding length are composed of a 100% solid reactive or non-reactive polymer or a composition in which they are mixed. It is typically colored and has opacity, and the main function of these colored layers is beauty. In addition, the appearance of fingernails or toenails has become a particularly important point for many fashion conscious people. In addition to cosmetics, the possibility of artificial nails is highly evaluated, including strengthening in a thin or brittle state where the nail is split into layers.

      Artificial nails are usually composed of chemically reactive monomers, oligomers or mixtures of these organic substances combined with polymers. Therefore, the artificial nail itself does not have electrical conductivity. Therefore, if you apply artificial nails to your own nails, you can not operate with nails in portable terminals, portable music players, digital cameras, portable display devices, personal computers that support touch events, There has been a significant problem in operating the device, such as using the belly of a finger, which significantly limits operability.

      On the other hand, the so-called top coat used for self-nail coating, artificial nail coating, or the like is used for both fingers and feet and has quick-drying, transparency, fastness, gloss, and ultraviolet attenuation. However, the top coat is composed of a combination of ethyl acetate, N-butyl acetate, cellulose acetate butyrate ester, and other organic substances, and the top coat itself does not have electrical conductivity like an artificial nail. For this reason, as with artificial nails, nails with a topcoat applied can be used with nails when operating portable terminals, portable music players, digital cameras, portable display devices, and personal computers that support touch events. Inappropriate, the user needs to devise operational methods such as using the belly of the finger when operating these devices.

      In particular, when nail lengthening is performed with an artificial nail, the touch from the vertical direction of the screen is obstructed by the artificial nail, and there is a problem that it is very difficult to touch with the finger pad. In that case, it is necessary for the user to touch and operate the skin at the tip of the fingertip that is not obstructed by the artificial nail while maintaining a unique posture of the finger. However, the non-inhibitory region is narrow and the degree of freedom in operability is extremely poor.

Special table 2012-531940 gazette (A) WO / 2008/047022 WO / 2008/130431

      As a measure for improving the operability, a touch-type device can be operated with an artificial nail by mounting a capacitor chip inside the artificial nail. However, this method requires a relatively expensive chip to be mounted on the artificial nail each time, which places a high financial burden on the user, and since the capacitor is mounted, the artificial nail is transparent from a cosmetic point of view. It has a low degree of freedom in terms of beauty, and artificial nail treatment has a heavy load on the nail and is not suitable for users who have a weak nail, and is not a solution for everyone. There was a problem.

      As one aspect of the present invention, a top coat capable of producing new effects and functions is proposed.

      The present invention comprises a topcoat composition comprising at least one particle in a topcoat composition, wherein the content of the particle is the same as or higher than a certain critical point, thereby allowing the surface of a human keratinous substance to function as a conductor. This is a court proposal.

      As an embodiment of the present invention, the particles are conductive.

      In one embodiment of the present invention, a top coat composition is characterized in that conductive particles are used as a medium and an organic solvent, an inorganic solvent, or a mixture thereof.

      The conductive particles have electrical conduction properties and can move charge from any first location to a second location. That is, it is possible to conduct electricity.

      Examples of the conductive particles that can be used include carbon nanotubes (CNT), graphene, graphite, fullerene, carbon black (CB), graphite, carbon fibers, or a conductive medium in which a plurality of them are mixed. It is characterized by things.

      As one embodiment of the present invention, the dispersion is, for example, ethyl acetate, N-butyl acetate, benzylbutyl phthalate, isopropyl alcohol, or an organic solvent obtained by mixing them.

      One aspect of the present invention is characterized in that the medium is one of cellulose ester, cellulose acetate butyrate ester, benzophenone, or a mixture thereof, which has the effect of protecting human keratinous substances from UV. .

      As one aspect of the present invention, a medium for maintaining the smoothness of the surface of the stratum corneum is included. The medium is, for example, any one of silicone polymer, copolymer, polyamide, polyacrylamide, polycarboxylic acid and the like, or a medium obtained by mixing a plurality of them.

      As one aspect of the present invention, the surface of the stratum corneum contains a medium that enhances adhesion with a pre-applied coating. The medium is characterized in that, for example, one of sucrose acetate isobutyrate, aminoalkoxysilane, aminomethoxysilane, or the like, or a mixture of a plurality of them is used.

      As one embodiment of the present invention, the topcoat composition is characterized in that the concentration of the conductive particles mixed in the dispersion is Pc × 100% or more.

      As one aspect of the present invention, the Pc is a percolation threshold.

      Percolation conduction is a phenomenon in which when a conductive substance is added to an insulator, a three-dimensional conductive network is built above a certain threshold value, and the resistance value rapidly decreases. The threshold is called a percolation threshold.

The percolation threshold depends on the concentration, P, of conductive particles as a medium. As one aspect of the present invention, the following formula is used. When the density of the medium, P, and the percolation threshold, Pc, are equal, the number of clusters, Ns, which is a mass of conductive particles, is expressed by the following formula (Formula 1).
LOG (N _S ) = − τLOG (s) + C ′
s is the size of the cluster, and τ is the index number.
For example, in the case of graphene, wt% of Functional Graphene Sheet (FGS) in PDMS (Poly (dimethylsiloxane)) in the dispersion is 2.5% or more, and the resistance value (reciprocal of conductivity) is 10 ¹⁴ Ωcm to 10 ^−1. In the case of CNT in Ωcm, it is known that the resistance value rapidly decreases from 10 ¹¹ Ωcm to 10 ⁴ Ωcm when the CNT wt% is 2.5% or more. Thus, in order to achieve good electrical conduction, it is necessary to appropriately design the ratio of the medium in the dispersion medium. When the percolation threshold is, for example, 2.5 wt%, it is possible to conduct percolation conduction by designing the ratio of the medium to 2.5 wt% or more.

      The shape of the conductive particles may be a circle or a square as long as the fluidity and transparency as a degree of freedom for beauty are not impaired. The particle size can be selected from nm to mm. The finer the size of the conductive particles, the higher fluidity is ensured, and the wettability of the topcoat is improved, which is convenient.

      In one embodiment of the present invention, the conductive particles can be mixed with either a nail polish type or UV gel type topcoat. At this time, a medium (conductive particles) equal to or higher than the percolation threshold may be mixed with the dispersion medium. The top coat has a nail polish type (air-drying) or a UV gel type. The nail polish type has characteristics of losing gloss relatively quickly (within 2 weeks) although it has quick drying. The nail polish type top coat has a merit that it can be easily removed by using a solvent, but has a demerit such as low scratch resistance and low solvent resistance. The UV gel type top coat is a photo-curing type and has high solvent resistance and scratch resistance, but it is cumbersome to use because it requires a special removing solution and treatment for removal. In one embodiment of the present invention, the user can selectively use the nail polish type and the UV gel type depending on the application.

As one embodiment of the present invention, the conductive top coat can be formed in the following configuration. When CNT is used, the percolation threshold is 2.5 wt%. Since the density of a general top coat is 0.6 g / ml (5 ml = 3.0 g), for example, if 2.5 wt% CNT is prepared for 10 ml of the top coat composition, the amount thereof Is 0.15 g. When 2.5 wt% CNT is contained, the resistance value is 10 ⁴ Ω, and in order to ensure sufficient conductivity and product reliability for the user, for example, when 4.0 wt% CNT is contained. 0.24 g of CNT is required. In that case, after containing 0.24g of CNT with respect to a topcoat composition, electroconductivity is acquired by fully stirring.

Claims (15)

As one aspect of the present invention, the topcoat composition to be applied to a human keratinous substance is characterized by containing at least one particle and a dispersion. The topcoat composition of claim 1, wherein the particles are conductive. The topcoat composition according to claim 1, wherein the dispersion is an organic solvent, an inorganic solvent, or a mixture thereof. The topcoat composition according to claim 1, wherein the dispersion is an organic solvent, an inorganic solvent, or a mixture thereof using conductive particles as a medium as one aspect of the present invention. The conductive particles are, for example, carbon nanotubes (CNT), graphene, graphite, fullerene, carbon black (CB), graphite, carbon fiber, or a medium in which a plurality of them are mixed. Item 1, 2 and 4 conductive particles. The dispersion is characterized by being ethyl acetate, N-butyl acetate, benzyl butyl phthalate, isopropyl alcohol, or a medium in which they are mixed. The dispersion is further characterized by being one of cellulose ester, cellulose acetate butyrate ester, benzophenone, or a mixture of a plurality thereof, which has an effect of protecting human keratinous substances from UV. The dispersion liquid further includes a medium for maintaining the smoothness of the surface of the stratum corneum. For example, it is a medium in which any one of silicone polymer, copolymer, polyamide, polyacrylamide, polycarboxylic acid or the like, or a mixture thereof is used. The dispersion liquid is characterized by containing a medium that enhances adhesion with a coating applied in advance to the surface of the stratum corneum. The medium is characterized in that, for example, one of sucrose acetate isobutyrate, aminoalkoxysilane, aminomethoxysilane, or the like, or a mixture of a plurality of them is used. The conductive particles have electrical conduction properties and can move charge from any first location to a second location. The topcoat composition according to claim 1, wherein the composition has electrical conductivity by containing the conductive particles. The topcoat composition according to claim 1, wherein the concentration of the conductive particles mixed in the dispersion is Pc × 100% or more as one aspect of the present invention. The topcoat composition according to claim 1, wherein the Pc is a percolation threshold. As one aspect of the present invention, the particle size of the conductive particles can be selected from nm to μm. The diameter of the particles is, for example, 1,10,100,1,000,10,000, 100,000, 1,000,000, 10,000,000, 999,000,000 nm, or any value in these ranges , Any intermediate value, any preceding value, and any combination of intermediate values. As one embodiment of the present invention, the conductive particles may have any shape. Any shape such as a circle, a square, a triangle, a star, a pentagon, and a hexagon may be used. The topcoat composition according to claim 1, wherein the conductive particles can function when mixed with any dispersion liquid, such as a nail polish type, a UV gel type, or the like.