Cosmetic laminate, covering coating layer, method for manufacturing artificial nail

Abstract

Provided is a cosmetic laminate which can be firmly adhered to a part of a living body and which can be easily peeled off from the living body at any timing. A cosmetic laminate (100) according to the present disclosure is provided with a cosmetic layer (101) that adheres to a part of a living body (1), and a coating layer (102). The cosmetic layer (101) and the coating layer (102) are disposed such that the cosmetic layer (101) is located between the living body (1) and the coating layer (102). The cosmetic layer (101) contains a cosmetic resin composition containing a stimuli-responsive material that causes a volume change by an external stimulus, and is adhered to a part of the living body (1) by a cured product of the cosmetic resin composition. The contact angle of the water with respect to the surface of a cured product of the cosmetic resin composition is 30-110 degrees (inclusive). The adhesive strength of the cosmetic layer (101) to a part of the living body (1) is reduced by a change in the volume of a cured product caused by imparting an external stimulus to the cured product of the cosmetic resin composition. The cover coating layer (102) has an opening ratio of 40% or less.

Description

Technical Field

[0001] The present disclosure relates to a cosmetic laminate, a covering coating, a method of making an artificial nail, and a method of removing an artificial nail. Background Art

[0002] In recent years, many people have used cosmetics such as gel artificial nails and eyelash extensions that can be worn continuously on a living body for a period of several days to several weeks. In the prior art, nail cosmetics such as gel artificial nails are firmly bonded to the body's nails using light-curing resins or the like. In addition, hair cosmetics such as eyelash extensions are firmly bonded to eyelashes or the like using moisture-curing resins or the like. When these cosmetics are peeled off from a living body, solvents such as acetone are generally used. When peeling off nail cosmetics from a living body, grinding is often performed before or after using the solvent.

[0003] Patent Document 1 discloses an artificial nail composition that uses radical polymerization to firmly bond an artificial nail to a natural nail.

[0004] Patent Document 2 discloses an artificial nail raw material composition comprising a radical polymerizable compound, a polyfunctional thiol compound having a mercapto group, and a photopolymerization initiator. By using the artificial nail raw material composition, the adhesion between the artificial nail and the self-nail can be maintained for a long time without using an adhesive and a primer. When removing the artificial nail obtained by curing the artificial nail raw material composition, the following method is used: first, the artificial nail is shaved to cause damage, and then cotton soaked in acetone is placed on the artificial nail for about 10 minutes, and then the artificial nail is peeled off from the self-nail using a stick or the like.

[0005] Patent Document 3 discloses an artificial nail composition containing an ionic monomer that can be polymerized by ultraviolet irradiation. The artificial nail obtained by curing the artificial nail composition can be removed from the natural nail by an acid having a pH of 3.5 or less.

[0006] Patent Document 4 discloses a method and a kit for treating a nail surface, which can remove a covering (such as a gel artificial nail or an artificial nail) applied to the nail surface by solvent immersion for less than 20 minutes, peeling, or a combination thereof.

[0007] As adhesives for eyelash extensions, cyanoacrylates and the like are generally used. Cyanoacrylates are adhesives with strong adhesive strength that are cured and bonded by polymerization using moderate humidity in the air. Cyanoacrylates are known as instant adhesives and are widely used not only in industrial and medical applications but also in general households. For eyelash extensions, etc., by using cyanoacrylate adhesives to firmly bond hair to artificial hair, artificial hair can also be bonded to eyelashes over a period of several weeks. Patent document 5 discloses a cyanoacrylate-containing composition comprising cyanoacrylate and fullerene. The cyanoacrylate-containing composition can be used as an adhesive composition for eyelash extensions, etc., and has excellent storage stability.

[0008] Prior art literature

[0009] Patent Literature

[0010] Patent Document 1: Japanese Patent Application Publication No. 2010-53097

[0011] Patent Document 2: Japanese Patent Application Publication No. 2014-5260

[0012] Patent Document 3: Japanese Patent Application Publication No. 2009-5260

[0013] Patent Document 4: Japanese Patent Application No. 2019-512000

[0014] Patent Document 5: Japanese Patent Application Publication No. 2016-121299 Summary of the invention

[0015] Problem that the invention aims to solve

[0016] Cosmetic resin compositions such as cyanoacrylates, which are light-curing resins used in gel artificial nails and humidity-curing resins used in eyelash extensions, can be bonded to living bodies such as nails and hair with high strength. However, in order to peel them from the living body, grinding is required, or solvents such as acetone, acids, etc. are used, and the peeling process places a heavy burden on living bodies such as nails and hair. On the other hand, in the case where the adhesiveness of the cosmetic resin composition to the living body is reduced in order to facilitate the peeling process, the problem of not being able to continuously wear the cosmetics on the living body for a desired period of time arises.

[0017] The present disclosure provides a cosmetic layered product that can be firmly adhered to a part of a living body and can be easily peeled off from the living body at an arbitrary timing.

[0018] Solutions for solving problems

[0019] The present disclosure provides a cosmetic laminate, which comprises:

[0020] A cosmetic layer bonded to a part of a living body, and

[0021] Covering coating,

[0022] The cosmetic layer and the covering coating are arranged such that the cosmetic layer is located between the living body and the covering coating when the cosmetic layered product is bonded to the living body.

[0023] The cosmetic layer comprises a cosmetic resin composition containing a stimuli-responsive material, and is bonded to the part of the living body via a cured product of the cosmetic resin composition, wherein the stimuli-responsive material changes in volume due to an external stimulus (excluding an external stimulus due to contact with a solvent and an external stimulus due to contact with a solution).

[0024] The contact angle of water on the surface of the cured product of the cosmetic resin composition is 30° or more and 110° or less,

[0025] The adhesive strength of the cosmetic layer to the part of the living body is reduced due to a volume change of the cured product of the cosmetic resin composition caused by applying the external stimulus to the cured product,

[0026] The aforementioned covering coating has an open porosity of 40% or less.

[0027] In another aspect, the present disclosure provides a cosmetic laminate comprising:

[0028] A cosmetic layer bonded to a part of a living body, and

[0029] Covering coating,

[0030] The cosmetic layer and the covering coating are arranged such that the cosmetic layer is located between the living body and the covering coating when the cosmetic layered product is bonded to the living body.

[0031] The cosmetic layer comprises a cosmetic resin composition containing a stimuli-responsive material, and is bonded to the part of the living body via a cured product of the cosmetic resin composition, wherein the stimuli-responsive material changes in volume by generating gas in response to an external stimulus (excluding an external stimulus caused by contact with a solvent and an external stimulus caused by contact with a solution).

[0032] The adhesive strength of the cosmetic layer to the part of the living body is reduced due to a volume change of the cured product of the cosmetic resin composition caused by applying the external stimulus to the cured product,

[0033] The aforementioned covering coating has a 1.5×10 8 cc / m2 Gas permeability below 24hr·atm.

[0034] In another aspect, the present disclosure provides a covering coating covering at least a portion of a cosmetic layer that causes a volume change by an external stimulus (wherein an external stimulus caused by contact with a solvent and an external stimulus caused by contact with a solution are excluded),

[0035] The aforementioned covering coating has an open porosity of 40% or less and a tensile modulus of 5 MPa or more.

[0036] In another aspect, the present disclosure provides a method for manufacturing an artificial nail, comprising:

[0037] Applying a resin composition for an artificial nail containing a stimuli-responsive material to a nail, and curing the resin composition for an artificial nail to form a first artificial nail layer bonded to the nail, wherein the stimuli-responsive material changes in volume due to an external stimulus (excluding an external stimulus due to contact with a solvent and an external stimulus due to contact with a solution); and

[0038] A cover coat layer having an opening ratio of 40% or less is formed on the first artificial nail layer.

[0039] In another aspect, the present disclosure provides a method for removing an artificial nail, which is a method for removing an artificial nail adhered to a nail.

[0040] The artificial nail comprises a first artificial nail layer, wherein the first artificial nail layer is formed by curing an artificial nail resin composition containing a stimuli-responsive material, wherein the stimuli-responsive material changes in volume in response to an external stimulus (excluding an external stimulus caused by contact with a solvent and an external stimulus caused by contact with a solution).

[0041] The aforementioned method includes:

[0042] forming a cover coating layer having an opening rate of 40% or less on the surface of the exposed first artificial nail layer; and

[0043] The external stimulus is applied to the first artificial nail layer, and the first artificial nail layer and the cover coat layer are removed from the nail.

[0044] In another aspect, the present disclosure provides a method for removing an artificial nail, which is a method for removing an artificial nail adhered to a nail.

[0045] The artificial nail comprises a first artificial nail layer and a cover coating layer disposed on the first artificial nail layer and having an opening rate of 40% or less, wherein the first artificial nail layer is formed by curing a resin composition for an artificial nail containing a stimuli-responsive material, wherein the stimuli-responsive material changes in volume in response to an external stimulus (excluding an external stimulus caused by contact with a solvent and an external stimulus caused by contact with a solution).

[0046] The method includes applying the external stimulus to the first artificial nail layer, and removing the first artificial nail layer and the cover coat layer from the nail.

[0047] Effects of the Invention

[0048] The cosmetic layered product of the present disclosure can be firmly adhered to a part of a living body and can be easily peeled off from the living body at an arbitrary timing. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a schematic cross-sectional view showing a state where the cosmetic layered product according to the first embodiment is adhered to a living body.

[0050] Figure 2 This is a schematic cross-sectional view showing a first example of a state in which the cosmetic layered product in the first embodiment is adhered to a nail.

[0051] Figure 3 This is a schematic cross-sectional view showing a second example of a state in which the cosmetic layered product in the first embodiment is adhered to a nail.

[0052] Figure 4 This is a schematic cross-sectional view showing a third example of a state in which the cosmetic layered product in the first embodiment is adhered to a nail.

[0053] Figure 5 This is a schematic cross-sectional view for explaining an example of the principle of reduction in the adhesive strength between the cosmetic laminate and the nail when the cosmetic layer of the cosmetic laminate in Embodiment 1 is used as a primer layer for gel artificial nails.

[0054] Figure 6 This is a schematic cross-sectional view for explaining an example of the artificial nail removal method in the first embodiment.

[0055] Figure 7 This is a cross-sectional view showing a cover coating layer in the second embodiment.

[0056] Figure 8 This is a schematic cross-sectional view for explaining an example of a method for removing an artificial nail in another embodiment.

[0057] Fig. 9This is a graph showing the evaluation results of the adhesive strength ratios before and after ultraviolet light irradiation of Samples 1 to 3 and Samples 21 to 24.

[0058] Fig.10 It is a graph showing the bubble area ratio of Samples 4, 5, 6, 7, 9, 11, and 12 relative to the case of Sample 25 without a covering coating layer with respect to the ultraviolet light transmittance at a wavelength of 340 nm.

[0059] Fig.11 This is a graph showing the cell area ratio of samples 4, 5, 7, 8, 10, 11, and 12 relative to the case of sample 25 without a coating layer versus the elastic modulus. DETAILED DESCRIPTION

[0060] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings. However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of known matters or repeated descriptions of substantially the same structures may be omitted. This is to avoid the following description being too lengthy and to make it easy for those skilled in the art to understand.

[0061] It should be noted that the drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0062] (Implementation Method 1)

[0063] Below, use Figure 1 to Figure 6 Implementation method 1 will be described.

[0064] [1-1. Structure]

[0065] Figure 1: is a cross-sectional view showing a state where the cosmetic laminate 100 in Embodiment 1 is bonded to a living body 1. The cosmetic laminate 100 in Embodiment 1 is used as a cosmetic to be bonded to a part of a living body 1. The cosmetic laminate 100 in Embodiment 1 includes a cosmetic layer 101 and a cover coating layer 102 to be bonded to a part of a living body 1. The cosmetic layer 101 and the cover coating layer 102 are arranged such that the cosmetic layer 101 is located between the living body 1 and the cover coating layer 102 when the cosmetic laminate 100 is bonded to the living body 1. The cosmetic layer 101 includes a cosmetic resin composition containing a stimuli-responsive material that changes volume due to an external stimulus, and is bonded to a part of a living body 1 via a cured product of the cosmetic resin composition. The contact angle of water on the surface of the cured product of the cosmetic resin composition is 30° or more and 110° or less. The adhesive strength of the cosmetic layer 101 to the part of the living body 1 is reduced by the volume change of the cured product of the cosmetic resin composition caused by applying an external stimulus to the cured product of the cosmetic resin composition. The cover coating 102 has an open porosity of 40% or less. It should be noted that the external stimulus here refers to an external stimulus other than the external stimulus caused by contact with the solvent and the external stimulus caused by contact with the solution. In addition, multiple stimuli may be combined as the external stimulus.

[0066] The cosmetic layered product 100 in Embodiment 1 includes the cosmetic layer 101 having the above-described structure, and can be firmly adhered to a part of the living body, and can be easily peeled off from the living body at an arbitrary timing by applying an external stimulus.

[0067] In the cosmetic laminate 100 in the first embodiment, the cosmetic layer 101 bonded to a part of the living body may be a cosmetic directly bonded to the part of the living body, or may be a cosmetic indirectly bonded to the living body via another layer such as a film. For example, when the cosmetic is a nail cosmetic, the film as another layer may be at least one selected from the group consisting of a primer, a base gel, and a base coat.

[0068] The cosmetic laminate 100 in the first embodiment further includes a covering coating 102. The covering coating 102 is arranged so that the cosmetic layer 101 is located between the covering coating 102 and the living body 1. The covering coating 102 has an opening ratio of 40% or less. In the cosmetic laminate 100 in the first embodiment, when the cosmetic layer 101 undergoes a volume change due to an external stimulus being applied to the cosmetic layer 101, the covering coating 102 is provided so that the volume change is not easily caused on the surface of the cosmetic layer 101 on the covering coating 102 side, that is, the surface on the opposite side to the living body 1. As a result, the force of the volume change of the cosmetic layer 101 effectively acts on the surface on the living body 1 side, and the cosmetic laminate 100 can be efficiently peeled off from the living body 1. In other words, the force of the volume change generated in the cosmetic layer 101 is enclosed by the covering coating 102 (that is, pressed from above), so that the force of the volume change of the cosmetic layer 101 can be efficiently used for the interface peeling of the living body 1 and the cosmetic laminate 100. Therefore, the cosmetic laminate 100 in Embodiment 1 can effectively reduce the adhesive force to the living body 1. Therefore, the cosmetic laminate 100 in Embodiment 1 can be easily peeled from the living body if an external stimulus is applied at any timing when the cosmetic laminate 100 is to be peeled from the living body. It should be noted that, hereinafter, the effect of efficiently acting the force of the volume change of the cosmetic layer 101 by the cover coating 102 on the surface on the living body 1 side as described above may be referred to as "encapsulation effect".

[0069] The opening ratio of the covering coating 102 is 40% or less. By setting the opening ratio to 40% or less, the following effect is obtained: the stress caused by the volume change of the cosmetic layer 101 acts on the surface opposite to the living body 1, and the stress acting on the surface on the living body 1 side is relaxed and reduced. Therefore, the cosmetic laminate 100 is easily peeled off from the living body 1. In particular, when the volume change of the cosmetic layer 101 is a volume expansion caused by gas, liquid, etc., the cosmetic laminate 100 is more easily peeled off from the living body 1 due to the sealing effect achieved by the covering coating 102. Hereinafter, the relaxation of the stress caused by the volume change of the cosmetic layer 101 on the surface on the living body 1 side is sometimes referred to as "stress relaxation".

[0070] The opening ratio of the cover coating 102 may be 5% or less. If the opening ratio of the cover coating 102 is 5% or less, the relaxation of stress is further suppressed, and the effect of sealing the gas or the like that causes the volume change of the cosmetic layer 101 into the inside of the cosmetic layer 101 is obtained. Therefore, it is easier to peel the cosmetic laminate 100 from the living body 1. The opening ratio of the cover coating 102 may be 1% or less. If the opening ratio of the cover coating 102 is 1% or less, the relaxation of stress is further suppressed, and the sealing effect is further improved, so it is easier to peel the cosmetic laminate 100 from the living body 1.

[0071] The holes in the cover coating may not be arranged regularly like meshes and punching holes. For example, the holes may be formed by etching, or holes may be formed at random positions and in random shapes due to the process conditions when forming the cover coating. In the present disclosure, the holes in the cover coating may have any shape as long as they penetrate the cover coating at any position.

[0072] The opening ratio of the overcoat layer 102 can be obtained by calculating the area ratio of the openings in the total area using area analysis of an image such as an optical microscope or a microscope photograph of the main surface of the overcoat layer 102 .

[0073] The cosmetic layer 101 and the cover coating 102 may be Figure 1 As an example, in this case, the cosmetic layer 101 and the cover coating 102 are physically and directly in contact with each other. By providing the cover coating 102 in contact with the cosmetic layer 101, the sealing effect achieved by the cover coating 102 can be more effectively exerted. Therefore, it is easier to peel the cosmetic laminate 100 from the living body 1.

[0074] The cosmetic layer 101 and the cover coating 102 may not be in contact with each other. For example, another layer may be provided between the cosmetic layer 101 and the cover coating 102. In such a configuration, the sealing effect achieved by the cover coating 102 can be obtained, so that the cosmetic laminate 100 can be easily peeled off from the living body 1.

[0075] The covering coating layer 102 can obtain the sealing effect as long as it covers at least a portion of the cosmetic layer 101. However, in order to more effectively exert the sealing effect by the covering coating layer 102, the covering coating layer 102 preferably covers 50% or more of the surface area of ​​the cosmetic layer 101, more preferably covers 80% or more of the surface area of ​​the cosmetic layer 101, and particularly preferably covers the entire surface of the cosmetic layer 101.

[0076] Hereinafter, the cosmetic layer 101 and the cover coating layer 102 will be described in more detail.

[0077] (Cosmetic layer)

[0078] The cosmetic resin composition contained in the cosmetic layer 101 of the cosmetic laminate 100 in Embodiment 1 (hereinafter referred to as "the cosmetic resin composition in Embodiment 1") has a contact angle with water of 30° or more and 110° or less in a cured state. The contact angle can be measured using a contact angle meter. The contact angle with water is measured by a drop method. Specifically, it is obtained by measuring the angle between the surface of the cured product and water when, for example, 5 μL of water is dropped on the flat surface of the cured product of the cosmetic resin composition using a contact angle meter. The contact angle of water can generally represent the order of the hydrophilicity and hydrophobicity characteristics of the material, and is also correlated to a certain extent with material properties such as solubility parameters (hereinafter referred to as "SP values"). It is generally known that at least one material selected from the group consisting of materials having similar hydrophilicity and hydrophobicity characteristics and materials having similar SP values ​​has a tendency to have good compatibility between materials and stronger adhesion. Materials having a contact angle of water of 30° or more and 110° or less are close to the contact angle characteristics of organisms such as nails and hair. Therefore, the cosmetic laminate 100 in Embodiment 1 has high adhesive force to the living body in the state where the cosmetic resin composition is cured, and can be stably adhered to the living body for a long time. When the contact angle of water on the surface of the cured product of the cosmetic resin composition in Embodiment 1 is 40° or more and 110° or less, the cosmetic laminate 100 in Embodiment 1 can be more strongly adhered to the living body. When the contact angle of water on the surface of the cured product of the cosmetic resin composition in Embodiment 1 is 60° or more and 100° or less, the cosmetic laminate 100 in Embodiment 1 can be more strongly adhered to the living body.

[0079] In addition, as described above, the cosmetic resin composition in Embodiment 1 includes a stimulus-responsive material that causes a volume change due to an external stimulus. By including such a stimulus-responsive material, the cured product of the cosmetic resin composition in Embodiment 1 causes a volume change by being given an external stimulus, thereby reducing the bonding strength with a part of the organism. With such a configuration, the cosmetic resin composition in Embodiment 1 can be easily peeled off from the organism as long as an external stimulus is given at any timing when the composition is to be peeled off from the organism. That is, the cosmetic layer 101 of the cosmetic laminate 100 in Embodiment 1 can be easily peeled off from the organism by being given an external stimulus. The stimulus-responsive material can be a material that causes at least one selected from the group consisting of a physical property change and a chemical reaction by an external stimulus. As physical property changes, gasification, sublimation, changes in density, liquefaction, changes in viscoelasticity, etc. can be listed. As chemical reactions, reactions accompanied by changes in molecular structure, decomposition reactions, etc. can be listed. The stimulus-responsive material can also be a material that generates gas due to a chemical reaction or sublimation caused by an external stimulus. The volume change is caused by the generation of gas.

[0080] The cured product of the cosmetic resin composition in Embodiment 1 refers to a solid product such as a coating obtained by volatilizing the solvent of the cosmetic resin composition, for example, when the cosmetic resin composition contains a solvent and is a resin composition capable of forming a solid product such as a coating by volatilizing the solvent. In addition, when the cosmetic resin composition in Embodiment 1 is a curable resin composition that contains a polymerizable compound and can be cured by light or heat, for example, the cured product of the cosmetic resin composition in Embodiment 1 refers to a cured product of the cosmetic resin composition that is cured by irradiation with light or heat.

[0081] The external stimulus is, for example, at least one selected from the group consisting of light, heat, magnetism, electricity and external force. According to these external stimuli, it is possible to perform a simpler peeling, and it is not easy to cause direct damage to the organism. As described above, a variety of stimuli can be combined as external stimuli. Therefore, for example, light and heat can be used as external stimuli at the same time, or a variety of lights with mutually different wavelengths can be used. In the case of using light as the external stimulus, for example, ultraviolet light, visible light, near infrared light, infrared light or far infrared light can be used. In the case of using heat as the external stimulus, as a means of imparting heat, for example, a heat source, warm air, near infrared light, infrared light, far infrared light or microwaves can be used. The external force is, for example, an impact.

[0082] The degree of the external stimulus applied is not particularly limited. The degree of the external stimulus applied to the cosmetic laminate 100 can be appropriately adjusted according to at least one selected from the group consisting of the type of stimulus-responsive material contained in the cosmetic resin composition in Embodiment 1 and the content ratio of the stimulus-responsive material. In addition, the degree of the external stimulus applied to the cosmetic laminate 100 can be changed according to the contact angle of water on the surface of the cured product of the cosmetic resin composition in Embodiment 1.

[0083] The external stimulus may be at least one selected from the group consisting of light and heat. Light and heat can be easily applied by simple equipment. In addition, light can ensure high safety for the organism by appropriately selecting the wavelength. For example, light with a wavelength of 280 nm or more has high safety for the organism. In addition, heat can ensure high safety for the organism by appropriately selecting the temperature. The temperature range of heat that can be applied as an external stimulus can be appropriately determined according to the part of the organism to which the cosmetic is bonded. For example, in the case where the cosmetic is bonded to hair, for example, the safety for the organism is high at a temperature below 250°C. In addition, at a temperature below 100°C, the safety is higher not only for hair but also for organisms such as nails and skin, so a variety of cosmetic resin compositions bonded to the organism can be safely used as external stimuli. Therefore, in the case where the external stimulus is at least one selected from the group consisting of light and heat, the process of peeling the cosmetic laminate 100 from the organism becomes simpler, and direct damage to the organism can be further suppressed.

[0084] As an external stimulus, for example, light having a wavelength within a range of less than 400nm can be used. Here, in this specification, "light having a wavelength within a certain specific range" refers to light containing light with wavelengths within the specific range. That is, in the case where the light contains light of multiple wavelengths (that is, in the case of light with a spectral distribution), as long as it is light containing at least light with wavelengths within the specific range, it may also contain light with wavelengths outside the range. Light having a wavelength within a range of less than 400nm can be used as an external stimulus, which can prevent the adhesive strength between the cosmetic laminate 100 and the organism from being reduced in normal life such as under general visible light illumination.

[0085] As an external stimulus, for example, light having a wavelength in the range of 280 nm or more and less than 400 nm can be used. That is, the light used as an external stimulus can, for example, include light having a wavelength in the range of 280 nm or more and less than 400 nm. The external stimulus can, for example, mainly include wavelengths in the range of 280 nm or more and less than 400 nm. For example, wavelengths in the range of 280 nm or more and less than 400 nm that account for more than 50% of the total light amount can be included. Light can be easily imparted by simple equipment. In addition, light having a wavelength of 280 nm or more is highly safe for organisms. In addition, light having a wavelength of less than 400 nm can be used as an external stimulus, that is, the stimulus-responsive material contained in the resin composition for cosmetics in Embodiment 1 is a substance that causes a volume change by light having a wavelength of less than 400 nm, and can be regarded as a substance that is not easy to cause a volume change to the extent that the bonding strength with the organism is reduced when using light having a wavelength of more than 400 nm. Therefore, in this case, the imparting of a high-energy stimulus having a wavelength of about 400 nm can be achieved, and the reduction of bonding strength can be prevented in ordinary life such as general visible light illumination. In this way, when light having a wavelength in the range of greater than 280 nm and less than 400 nm is used as an external stimulus, it is possible to prevent the adhesive strength between the cosmetic laminate 100 and the living body from being reduced in normal life, and efficient peeling at any time can be achieved in a simpler method, and damage to the living body can be further suppressed.

[0086] As an external stimulus, light having a peak wavelength in the range of 280 nm or more and less than 400 nm may be used. In this case, it is possible to further prevent the adhesive strength between the cosmetic laminate 100 and the living body from decreasing in normal life, and to achieve efficient peeling at any time with a simpler method, and further suppress damage to the living body.

[0087] When light having a wavelength in the range of 280 nm to less than 400 nm is used as an external stimulus, the cured product of the cosmetic resin composition in Embodiment 1 may have a transmittance of, for example, 10% or more for light having any wavelength in the range of 280 nm to less than 400 nm. By making the cured product of the cosmetic resin composition in Embodiment 1 have such a transmittance, the external stimulus efficiently causes a volume change of the stimulus-responsive material, and as a result, the adhesive strength between the cosmetic laminate 100 and a part of the living body is efficiently reduced. That is, according to this configuration, the cosmetic laminate 100 in Embodiment 1 can be efficiently peeled off from the living body. The cured product of the cosmetic resin composition in Embodiment 1 may have a transmittance of 30% or more for light having any wavelength in the range of 280 nm to less than 400 nm, or may have a transmittance of 50% or more. When the transmittance is 30% or more, the external stimulus more efficiently causes a volume change of the stimulus-responsive material, and thus the adhesive strength between the cosmetic laminate 100 and a part of the living body is more efficiently reduced. When the transmittance is 50% or more, the external stimulus causes the volume change of the stimuli-responsive material more efficiently, so the bonding strength between the cosmetic laminate 100 and a part of the biological body is further effectively reduced. The higher the transmittance, the more efficiently the external stimulus causes the volume change of the stimuli-responsive material, so the maximum value of the transmittance is 100%. In addition, by making the cured product of the cosmetic resin composition in Embodiment 1 have a high transmittance, the effects of high transparency and improved design are also obtained.

[0088] The light used as an external stimulus can be, for example, light with a wavelength in the range of 280 nm or more and 380 nm or less. By making the wavelength of the light given as an external stimulus less than 380 nm, it is possible to achieve a stimulus with a high energy of about 380 nm, and in ordinary life such as general lighting, it is possible to more reliably prevent the bonding strength from decreasing. That is, in the case of using light with a wavelength in the range of 280 nm or more and 380 nm or less as an external stimulus, it is possible to more reliably prevent the bonding strength of the cosmetic laminate 100 from decreasing with the organism in ordinary life, and it is possible to achieve efficient peeling at any time with a simpler method, and it is also possible to further suppress damage to the organism. Furthermore, by using light with a wavelength of less than 380 nm as an external stimulus, for example, in the case of using the resin composition for cosmetics in Embodiment 1 as a primer for gel artificial nails, it is also possible to obtain an effect of preventing the bonding strength of the primer from decreasing when the gel artificial nails are cured. At this time, the cured product of the cosmetic resin composition in Embodiment 1 may have a transmittance of, for example, 10% or more, 30% or more, or 50% or more for light of any wavelength within the range of 280 nm or more and 380 nm or less. Since the cured product of the cosmetic resin composition in Embodiment 1 has the above transmittance for the wavelength of light used as an external stimulus, the cosmetic laminate 100 in Embodiment 1 can be efficiently peeled off from the living body by applying the external stimulus.

[0089] As an external stimulus, light having a peak wavelength in the range of 280 nm to 380 nm may be used. In this case, it is possible to further reliably prevent the adhesive strength between the cosmetic laminate 100 and the living body from decreasing in normal life, and to achieve efficient peeling at any time with a simpler method, and further suppress damage to the living body.

[0090] The light used as an external stimulus may be, for example, light having a wavelength in the range of 280 nm to 370 nm or light having a wavelength in the range of 280 nm to 365 nm. In addition, the light used as an external stimulus may be, for example, light having a peak wavelength in the range of 280 nm to 370 nm or light having a peak wavelength in the range of 280 nm to 365 nm. By making the peak wavelength of the light used as an external stimulus 370 nm or less or 365 nm or less, it is possible to further reliably prevent the adhesive strength between the cosmetic laminate 100 and the organism from being reduced in normal life, and to achieve efficient peeling at any time in a simpler method, and further suppress damage to the organism.

[0091] The light used as the external stimulus may be, for example, light having a peak wavelength in the range of 280 nm to 350 nm. When the peak wavelength of the light used as the external stimulus is 350 nm or less, higher energy is irradiated, thereby causing a greater volume change. As a result, the cosmetic laminate 100 in Embodiment 1 can be more efficiently peeled off from the living body.

[0092] As an example, when the cosmetic resin composition in Embodiment 1 is cured by light irradiation, the light used as the external stimulus (i.e., the light used to reduce the adhesion between the cured product of the cosmetic resin composition and the organism) may be, for example, light having a peak wavelength in the range of 280 nm to less than 390 nm. In this case, the light used when curing the cosmetic resin composition in this embodiment by light irradiation may be, for example, 390 nm to 450 nm.

[0093] The stimuli-responsive material contained in the cosmetic resin composition in Embodiment 1 can be any material that causes a volume change by an applied external stimulus, and can be appropriately selected according to the external stimulus used. However, considering contact with a living body, the stimuli-responsive material is required to have high biocompatibility.

[0094] As a stimuli-responsive material that causes a volume change by applying at least one light selected from the group consisting of ultraviolet light and visible light as an external stimulus, there can be cited azide compounds such as glycidyl azide polymers and azo compounds. Azide compounds are organic or inorganic compounds having an azide group, which decompose to generate nitrogen gas. In addition, azo compounds are organic or inorganic compounds having an azo group, which decompose to generate nitrogen gas.

[0095] Examples of stimuli-responsive materials that change in volume when heat is applied include:

[0096] (I) low boiling point materials such as petroleum ether, pentane, hexane, heptane, fatty acid hydrocarbons, methyl silane and halogenated hydrocarbons; and

[0097] (II) Thermally decomposable foaming materials such as azo compounds, hydrazine derivatives, nitroso compounds, azide compounds, tetrazole compounds, semicarbazide compounds, carbonates and bicarbonates. In order to prevent the stimuli-responsive material from volatilizing at room temperature and to stably disperse it in the resin composition for cosmetics, for example, the foaming material can be encapsulated with thermoplastic resins such as (meth)acrylates, acrylonitrile and vinylidene chloride. In addition, as a stimuli-responsive material that causes a volume change, a shape memory polymer having a characteristic of different volumes above and below the glass transition temperature can also be used. For example, polyurethane shape memory polymers that expand in volume by heating above the glass transition temperature can be listed.

[0098] The stimuli-responsive material may use at least one selected from the group consisting of near-infrared light and infrared light as an external stimulus, and cause a volume change by applying these lights. It is also possible to use at least one selected from the group consisting of near-infrared light and infrared light to increase the temperature of the cosmetic laminate 100, specifically the cosmetic layer 101, thereby causing the volume change of the stimuli-responsive material by the heat. For example, a material that easily absorbs at least one selected from the group consisting of near-infrared light and infrared light may be added to the cosmetic resin composition. Thus, by applying at least one selected from the group consisting of near-infrared light and infrared light, the effect of further increasing the temperature of the cosmetic laminate 100 may be obtained.

[0099] Examples of materials that increase the temperature by absorbing at least one selected from the group consisting of near-infrared light and infrared light include cyanine compounds, phthalocyanine compounds, naphthalocyanine compounds, porphyrin derivatives, naphthoquinone compounds, anthraquinone compounds, squarylium compounds, iminium compounds, diiminium compounds, triallylmethane compounds, azo compounds, dithiol metal complexes, and nanoparticles of carbon or gold.

[0100] The content ratio of the stimulus-responsive material in the cosmetic resin composition in Embodiment 1 can be appropriately selected so that when an external stimulus is applied, a volume change that can effectively reduce the bonding strength between the cosmetic laminate 100 and the organism can be caused. For example, the cosmetic resin composition in Embodiment 1 can contain 0.5% by volume or more of the stimulus-responsive material. By containing 0.5% by volume or more of the stimulus-responsive material, for example, the stimulus-responsive material can be present in an area of ​​0.5% or more of the bonding portion between the cosmetic laminate 100, specifically, the cosmetic layer 101 and the organism. As a result, when an external stimulus is applied, the cosmetic layer 101 can cause a volume change in an area of ​​0.5% or more of the bonding portion between the cosmetic layer 101 and the organism. Therefore, when an external stimulus is applied, the bonding strength between the cosmetic laminate 100 and the organism can be effectively reduced, and the cosmetic laminate 100 can be more easily peeled off from the organism. The cosmetic resin composition in Embodiment 1 can contain 1% by volume or more of the stimulus-responsive material. By including 1% by volume or more of the stimulus-responsive material, when an external stimulus is applied, the cosmetic layer 101 can cause a volume change in an area of ​​1% or more of the adhesion portion between the cosmetic layer 101 and the living body. Therefore, when an external stimulus is applied, the adhesion strength between the cosmetic layer 100 and the living body can be more effectively reduced, and the cosmetic layer 100 can be more easily peeled from the living body.

[0101] The cosmetic resin composition in Embodiment 1 may be composed only of a stimuli-responsive material. That is, the cosmetic resin composition in Embodiment 1 may contain the stimuli-responsive material at a ratio of 100% by volume. The cosmetic resin composition in Embodiment 1 may also contain the stimuli-responsive material at a ratio of less than 100% by volume, or may contain the stimuli-responsive material at a ratio of less than 50% by volume.

[0102] The content ratio of the stimulus-responsive material in the cosmetic resin composition can be confirmed, for example, by nuclear magnetic resonance (hereinafter referred to as "NMR"), infrared spectroscopy (hereinafter referred to as "IR"), mass spectrometry (hereinafter referred to as "MS"), secondary ion mass spectrometry (hereinafter referred to as "SIMS"), inductively coupled plasma mass spectrometry (hereinafter referred to as "ICP-MS"), scanning electron microscopy (hereinafter referred to as "SEM"), scanning electron microscope-energy dispersive X-ray analysis (hereinafter referred to as "SEM-EDX"), liquid chromatography, spectrophotometry, etc. In addition, whether the stimulus-responsive material is dissolved or uniformly dispersed in the cosmetic resin composition can be confirmed by the uniformity of light transmission. Whether the stimulus-responsive material is dissolved or uniformly dispersed in the cosmetic resin composition can also be confirmed using the refractive index. In the case where the stimulus-responsive material is a material having a crystal structure, X-ray diffraction (hereinafter referred to as "XRD") can also be used. Furthermore, the permeability or viscosity of the filter can also be used to evaluate the solubility.

[0103] The cosmetic resin composition in Embodiment 1 may contain other materials besides the stimulus-responsive material. For example, the cosmetic resin composition in Embodiment 1 may contain a polymer material that serves as a substrate as other materials. The other materials contained in the cosmetic resin composition in Embodiment 1 are selected, for example, from materials with high biocompatibility. For example, as a polymer material that serves as a substrate, acrylic materials, cyanoacrylate materials, silicone materials, urethane materials, urethane (meth) acrylate materials, styrene materials, epoxy materials, elastomers, etc. with high biocompatibility may be included. One of these materials may be included, or a plurality of them may be mixed. In particular, urethane (meth) acrylate materials are the main material of SOAK OFF GEL artificial nails, and are more excellent from the perspective of adhesion, safety, and softness to nails. In addition, cyanoacrylate materials have high biological safety, and further have high adhesion to hair, etc. Therefore, when the cosmetic resin composition in Embodiment 1 is used for cosmetics that adhere to hair, cyanoacrylate materials may be preferably used.

[0104] In addition, the cosmetic resin composition in the first embodiment is a resin composition that does not substantially contain additives that are highly toxic to living organisms. Examples of materials that are highly toxic to living organisms include benzene, dichloroethylene, dichloroacetylene, monochlorobenzene, ethylbenzene, styrene, lead, mercury, and arsenic. The content of these materials in the cosmetic resin composition in the first embodiment is, for example, 10 ppm or less, or less than the detection limit.

[0105] The cosmetic resin composition in Embodiment 1 may have a glass transition temperature of, for example, 150° C. or less. When the volume of the cured product changes, the cosmetic resin composition having a glass transition temperature of 150° C. or less and being somewhat soft reduces cracking of the cured product, thereby achieving an effect that the cosmetic laminate 100 is easily peeled off from the living body.

[0106] The cosmetic resin composition in Embodiment 1 can reduce the bonding strength between the cured product of the cosmetic resin composition and a part of a living body to, for example, 50% or less relative to the bonding strength before the external stimulus is given, by applying an external stimulus. That is, the cosmetic laminate 100 in Embodiment 1 can reduce the bonding strength to a part of a living body to, for example, 50% or less relative to the bonding strength before the external stimulus is given, by applying an external stimulus. By reducing the bonding strength to less than 50%, the cosmetic laminate 100 can be more easily peeled off from the living body by applying an external stimulus. The bonding strength can be reduced to less than 30%, or to less than 10%. The lower the bonding strength obtained by applying an external stimulus is relative to the bonding strength before the external stimulus is given, that is, the initial bonding strength, the more it is possible to achieve both strong adhesion to the living body before the external stimulus is given and easy peeling after the external stimulus is given.

[0107] The cured product of the cosmetic resin composition in Embodiment 1 changes in volume by being given an external stimulus, thereby reducing the bonding strength with a part of the organism. The volume change of such a cured product of the cosmetic resin composition is caused by the stimulus-responsive material causing a volume change due to the external stimulus. The mechanism by which the stimulus-responsive material causes a volume change by giving an external stimulus is not particularly limited. The stimulus-responsive material causes a volume change, for example, by causing at least one selected from the group consisting of a physical property change and a chemical reaction by an external stimulus. As a physical property change, as described above, gasification, sublimation, a change in density, liquefaction, a change in viscoelasticity, etc. can be listed. As a chemical reaction, as described above, reactions accompanied by changes in molecular structure, decomposition reactions, etc. can be listed. For example, the stimulus-responsive material can also cause a volume change by a chemical reaction caused by an external stimulus or by the generation of a gas generated by sublimation, etc. The volume change of the stimulus-responsive material caused by an external stimulus can be, for example, a volume change of more than 10%, a volume change of more than 20%, or a volume change of more than 50%. By causing a volume change of more than 10%, the bonding strength is easily reduced when an external stimulus is given. By causing a volume change of 20% or more, the adhesive strength is more likely to decrease when an external stimulus is applied. By causing a volume change of 50% or more, the adhesive strength decreases more stably even with a small stimulus.

[0108] For example, the stimulus-responsive material can also generate gas by applying an external stimulus, thereby causing a volume change of the stimulus-responsive material. The gas generation of the stimulus-responsive material caused by applying an external stimulus can be, for example, gas generation generated by chemical reactions such as decomposition of the stimulus-responsive material due to applying an external stimulus, or gas generation generated by sublimation of the stimulus-responsive material. Through the generation of such gas, the volume change of the cured product of the cosmetic resin composition is caused. Specifically, bubbles are generated in the cured product of the cosmetic resin composition by the generated gas, thereby causing a volume change of the cured product. The volume change of the cured product caused by the generation of bubbles is also caused at the bonding interface with the organism, so the bonding area between the cured product and the organism is reduced and the bonding strength is reduced.

[0109] In the case of volume change caused by gas generation, the volume change rate is large. Therefore, stripping by applying external stimulation becomes easier. Examples of generated gases include nitrogen, oxygen, hydrogen, carbon dioxide, water, ammonia, carbon monoxide, nitric acid, formaldehyde, etc. In particular, in the case of nitrogen, carbon dioxide, and water, they are excellent in biological safety and are not flammable, so they are safer.

[0110] In addition, the stimuli-responsive material expands by applying an external stimulus, and as a result, the cured product of the cosmetic resin composition may change in volume. Such a volume change caused by the expansion of the cured product may also reduce the bonding strength between the cured product and the living body.

[0111] When the cosmetic layer 101 in Embodiment 1 is provided on a living body, the thickness of the cosmetic layer 101 may be, for example, 10 μm or more. By setting the thickness of the cosmetic layer 101 to 10 μm or more, sufficient bonding strength with the living body can be obtained, and when gas is generated by applying an external stimulus, the gas is less likely to escape in the surface direction, and more gas can be retained between the living body and the cured product of the cosmetic resin composition.

[0112] In the case where the volume change of the cured product of the cosmetic resin composition is generated by the gas generation realized by the stimulus responsive material in the cosmetic resin composition in embodiment 1, the cured product of the cosmetic resin composition may have a void inside. For example, it is believed that if there are a plurality of fine voids in the cured product of the cosmetic resin composition, when the gas is generated when the external stimulus is given, the void portion has a smaller movement resistance than the main portion (i.e., the portion other than the void portion of the cosmetic resin composition), so the gas is easy to gather. By gathering a large amount of gas in the void portion, a greater volume change is generated, and the effect that the cured product of the cosmetic resin composition is easily peeled off from the organism is obtained. The diameter of the void can be, for example, less than 50 μm. There can be multiple voids in the cured product of the cosmetic resin composition. By having many smaller voids (for example, voids with a diameter of less than 10 μm), many voids can be maintained, and a larger bonding area with the organism can also be achieved. Therefore, by having such a structure, both a stronger bonding to the organism before the external stimulus is given and an easier peeling property after the external stimulus is given can be achieved. As a method for providing voids in a cured product of a cosmetic resin composition, there can be cited a method of allowing a gas such as air, nitrogen or carbon dioxide to be contained in the cosmetic resin composition; or a method of allowing the cosmetic resin composition to contain a porous material having at least one selected from the group consisting of nanopores and micropores in a state where a gas such as air is contained in the pores, etc. In addition, voids can also be provided by generating gas when the cosmetic resin composition is cured on a living body.

[0113] The cosmetic resin composition in Embodiment 1 has a glass transition temperature of, for example, 150° C. or less, so that when gas is generated by external stimulation, the cosmetic resin composition easily expands and causes a greater volume change, thereby enabling easier peeling.

[0114] In the case where the volume change of the cured product of the cosmetic layer 101 is generated by the generation of gas by the stimuli-responsive material in the cosmetic resin composition in Embodiment 1, the stimuli-responsive material in the cosmetic resin composition in Embodiment 1 may include an azide compound. The azide compound may be a glycidyl azide polymer. The glycidyl azide polymer has the property of decomposing and releasing nitrogen gas when irradiated with light in a wavelength region of, for example, about 400 nm or less. Therefore, in the case where the cosmetic resin composition in Embodiment 1 includes a glycidyl azide polymer, the peeling property when the stimulus is given is high. In addition, as an external stimulus, light having a wavelength in the range of 280 nm or more and 380 nm or less may be used. Light in such a wavelength range is excellent in safety to the organism. In addition, the stimuli-responsive material that responds to light in such a wavelength range can prevent the adhesive strength of the cosmetic laminate 100 from decreasing with the organism in normal life. Furthermore, since light in such a wavelength range can be used as an external stimulus, efficient peeling at any time can be achieved in a simpler method.

[0115] In the case where the stimulus-responsive material includes a glycidyl azide polymer, the cosmetic resin composition in Embodiment 1 may include the glycidyl azide polymer in a range of, for example, 0.5% by mass or more and 55% by mass or less. By containing 0.5% by mass or more of the glycidyl azide polymer, the cosmetic laminate 100 in Embodiment 1 can improve the peelability from the organism when an external stimulus is applied. By containing 55% by mass or less of the glycidyl azide polymer, the effect of easily maintaining the physical properties of the polymer material, etc., which becomes the base material in the cosmetic resin composition, is obtained. Therefore, for example, the effect of improving the bonding strength between the cosmetic laminate 100 and the organism before applying the external stimulus is obtained. The concentration of the glycidyl azide polymer in the cosmetic resin composition may be 1% by mass or more or 2% by mass or more. By making the concentration of the glycidyl azide polymer in the cosmetic resin composition 1% by mass or more or 2% by mass or more, the cosmetic laminate 100 in Embodiment 1 can further improve the peelability from the organism when an external stimulus is applied. In addition, the concentration of the glycidyl azide polymer in the cosmetic resin composition may be 35% by mass or less. By setting the concentration of the glycidyl azide polymer in the cosmetic resin composition to 35% by mass or less, the cosmetic laminate 100 in Embodiment 1 can obtain both high adhesion before external stimulation and excellent peelability when external stimulation is applied.

[0116] (cover coating)

[0117] As described above, the covering coating 102 is arranged so that the cosmetic layer 101 is located between the covering coating 102 and the biological body 1. The covering coating 102 has an open porosity of 40% or less.

[0118] The tensile modulus of the cover coating 102 of the cosmetic laminate 100 in the first embodiment is preferably 5 MPa or more. By setting the tensile modulus of the cover coating 102 to 5 MPa or more, for example, when the volume of the cosmetic layer 101 increases due to the application of external stimulation, the cosmetic layer 101 is less likely to expand toward the surface opposite to the living body 1. As a result, the effect of the cosmetic laminate 100 being easily peeled off at the interface with the living body 1 is obtained. In particular, it is considered that when gas is generated by applying external stimulation, the effect of gas being easily diffused in the surface direction of the interface between the cosmetic laminate 100 and the living body 1 is obtained. Therefore, the effect of the cosmetic laminate 100 being more easily peeled off at the interface with the living body 1 is obtained. The tensile modulus of the cover coating 102 can be obtained, for example, by a method based on Japanese Industrial Standard K 7113. Here, under the conditions of the test piece specified in Japanese Industrial Standard K 7113, there should be no holes on the surface and edge of the test piece. However, the tensile modulus of the coating layer in this specification has nothing to do with the porosity of the coating layer, that is, even when the test piece is provided with holes, the tensile modulus is obtained by the method in accordance with Japanese Industrial Standard K 7113, and this value is expressed as the tensile modulus of the coating layer. Hereinafter, Japanese Industrial Standards are referred to as "JIS".

[0119] In order to make the cosmetic laminate 100 more easily peelable at the interface with the living body 1, the tensile modulus of the cover coating 102 of the cosmetic laminate 100 in Embodiment 1 may be 50 MPa or more.

[0120] Furthermore, the tensile modulus of the cover coating layer 102 of the cosmetic layered product 100 in Embodiment 1 is more preferably 100 MPa or more. When the tensile modulus is 100 MPa or more, force is more easily transmitted in the surface direction, thereby achieving an effect of facilitating peeling.

[0121] The tensile modulus of the cover coating 102 is, for example, 400 GPa or less.

[0122] In the cosmetic laminate 100 of the first embodiment, the bonding strength between the cosmetic layer 101 and the cover coating layer 102 is preferably 0.05 N / cm 2 By making the bonding strength between the cosmetic layer 101 and the cover coating layer 102 0.05 N / cm 2As described above, even when the cosmetic layer 101 changes volume due to external stimulation, the adhesion or bonding between the covering coating 102 and the cosmetic layer 101 is easily maintained. As a result, stress caused by the volume change of the cosmetic layer 101 can be efficiently applied to the interface between the cosmetic laminate 100 and the organism 1. Therefore, the cosmetic laminate 100 is more easily peeled off at the interface with the organism 1. Regarding the bonding strength in the surface direction between the cosmetic layer 101 and the covering coating 102 in Embodiment 1, the bonding strength is 1 cm / s. 2 The cosmetic layer 101 and the covering coating 102 are bonded to each other over an area of ​​100 mm, and the bonding surface is stretched at 60 mm / min using a tensile tester or the like in a direction perpendicular to the bonding surface, and the maximum load when peeled off is expressed as the bonding strength. The stronger the bonding force between the cosmetic layer 101 and the covering coating 102, the more preferred. When the bonding strength between the cosmetic layer 101 and the covering coating 102 is, for example, 0.5 N / cm 2 In the above case, stress caused by the volume change of the cosmetic layer 101 can be more efficiently applied to the interface between the cosmetic laminate 100 and the living body 1. Therefore, the cosmetic laminate 100 is more easily peeled off at the interface with the living body 1. The bonding strength between the cosmetic layer 101 and the cover coating 102 is, for example, 100 kN / cm 2 the following.

[0123] In the case where the cured product of the cosmetic resin composition generates a volume change by generating gas due to an external stimulus, that is, in the case where the volume change of the cosmetic layer 101 is caused by generating gas due to an external stimulus, the coating layer 102 preferably has a volume of 1.5×10 8 cc / m 2 · Gas permeability of less than 24 hr·atm. The gas permeability can be measured, for example, by the isobaric method (JIS K7126-2) or the differential pressure method (JIS K7126-1). By setting the gas permeability of the cover coating 102 to 1.5×10 8 cc / m 2 ·24hr·atm or less, the gas generated by external stimulation is not easily released to the outside. As a result, the cosmetic laminate 100 is more easily peeled off from the living body 1. Furthermore, if the gas permeability of the cover coating is 1000cc / m 2 ·24hr·atm or less, it is more difficult to release the gas generated by external stimulation to the outside. As a result, the cosmetic laminate 100 is more easily peeled off from the organism 1. The covering coating 102 may also be completely impermeable to gas. Therefore, the gas permeability of the covering coating 102 is, for example, 0cc / m 2 ·24hr·atm or more.

[0124] The covering coating 102 in the first embodiment may include a polymer material and the like. The material of the covering coating 102 is selected, for example, from materials with high biocompatibility. For example, as the polymer material that becomes the base material of the covering coating 102, acrylic materials, cyanoacrylate materials, silicone materials, urethane materials, urethane (meth) acrylate materials, styrene materials, epoxy materials, elastomers, etc. with high biocompatibility may be included. One of these materials may be included in the covering coating 102, or a plurality of materials may be mixed and included in the covering coating 102. In particular, urethane (meth) acrylate materials are the main material of SOAK OFF GEL artificial nails, and are excellent from the viewpoints of adhesion, safety, etc. In addition, the covering coating 102 may also be formed using a film of polyethylene terephthalate (PET), polyethylene, polypropylene, polycarbonate, nylon, cellulose, cellulose derivatives, Teflon (registered trademark), polyimide, acrylic acid, etc., or a membrane filter with an opening rate of 40% or less, a nonwoven fabric, a cloth, a mesh-like object, etc. In addition, the cover coating 102 may be formed of a ceramic material or a metal material. In addition, the cover coating 102 may be a single layer or may be composed of two or more layers.

[0125] When light having a wavelength in the range of 280 nm to less than 400 nm is used as an external stimulus, the cover coating 102 may have a transmittance of, for example, 10% or more for light having any wavelength in the range of 280 nm to less than 400 nm. Since the cover coating 102 in Embodiment 1 has such a transmittance, the external stimulus efficiently causes a volume change of the stimulus-responsive material in the cosmetic resin composition, and as a result, the adhesive strength between the cosmetic laminate 100 and a part of the living body 1 is efficiently reduced. That is, according to this configuration, the cosmetic laminate 100 in Embodiment 1 can be efficiently peeled off from the living body 1. The cover coating 102 in Embodiment 1 may have a transmittance of 30% or more for light having any wavelength in the range of 280 nm to less than 400 nm, or may have a transmittance of 50% or more. When the transmittance is 30% or more, the external stimulus more efficiently causes a volume change of the stimulus-responsive material, and thus the adhesive strength between the cosmetic laminate 100 and a part of the living body 1 is more efficiently reduced. When the transmittance is 50% or more, the external stimulus causes the volume change of the stimuli-responsive material more efficiently, and thus the bonding strength between the cosmetic laminate 100 and a portion of the biological body 1 is further efficiently reduced. The higher the transmittance, the more efficiently the external stimulus causes the volume change of the stimuli-responsive material, and thus the maximum value of the transmittance is 100%.

[0126] The cover coating 102 in the first embodiment is formed of a material that does not substantially contain an additive that is highly toxic to a living body, for example. Examples of materials that are highly toxic to a living body include benzene, dichloroethylene, dichloroacetylene, monochlorobenzene, ethylbenzene, styrene, lead, mercury, and arsenic. The content of these materials in the cover coating 102 is, for example, 10 ppm or less or less than the detection limit.

[0127] The part of the living body to which the cosmetic layered product 100 in Embodiment 1 is adhered may be at least one selected from the group consisting of nails, hair, and skin.

[0128] The part of the organism to which the cosmetic laminate 100 in Embodiment 1 is adhered may be at least one selected from the group consisting of nails and hair. Nails or hair do not have a thin layer of stratum corneum structure that is easily peeled off like skin. Therefore, after the surface is degreased, by setting the cosmetic laminate 100 in Embodiment 1, it is possible to obtain a strong adhesive strength that allows the artificial nail formed using the cosmetic laminate 100 in Embodiment 1 or the cosmetics such as eyelash extensions adhered to the organism using the cosmetic laminate 100 in Embodiment 1 to be set on the organism for several weeks. That is, the cosmetic laminate 100 in Embodiment 1 is suitable as a cosmetic laminate for artificial nails or eyelash extensions.

[0129] In the case where the part of the living body to which the cosmetic laminate 100 in Embodiment 1 is bonded is an artificial nail, the cosmetic resin composition contained in the cosmetic layer 101 in Embodiment 1 may be, for example, a primer for artificial nails such as a primer for gel artificial nails, an adhesive for bonding an artificial nail sheet to a self-nail, or an artificial nail agent such as a gel artificial nail agent. In other words, the artificial nail resin composition in the present disclosure may be composed of the cosmetic resin composition in Embodiment 1. In this case, the artificial nail resin composition in the present disclosure may contain a material contained in a known artificial nail resin composition as a material other than the stimuli-responsive material, which is appropriately selected according to the application.

[0130] In the case where the part of the living body to which the cosmetic laminate 100 is adhered in the first embodiment is a nail, the cosmetic laminate 100 constitutes an artificial nail such as a gel artificial nail provided on the nail. In this case, for example, the cosmetic layer 101 is a first artificial nail layer adhered to the nail, and the cover coating 102 is arranged so that the first artificial nail layer is located between the cover coating 102 and the nail.

[0131] The cosmetic resin composition in the first embodiment is particularly suitable for use as a primer for gel artificial nails. That is, the cosmetic laminate 100 in the first embodiment can function as a primer for gel artificial nails as a whole, or the cosmetic layer 101 of the cosmetic laminate 100 can function as a primer for gel artificial nails. As described in the background art column, gel artificial nails are firmly bonded to the self-nail using a photocurable resin or the like, so when the gel artificial nail is peeled off from the nail, at least one of the group consisting of a solvent and abrasion needs to be selected, and the damage to the self-nail is very large. However, by using the cosmetic laminate 100 in the first embodiment for the primer for gel artificial nails, the gel artificial nail can be firmly bonded to the self-nail during the necessary period, and by applying external stimulation when it is desired to peel off, the gel artificial nail and the primer can be peeled off from the self-nail simply and while suppressing the damage to the self-nail.

[0132] Hereinafter, an example in which the resin composition for cosmetics according to the first embodiment is used as a primer for gel artificial nails will be described.

[0133] Figure 2 1 is a schematic cross-sectional view showing a first example of a state where the cosmetic layered product 100 in the first embodiment is adhered to the nail 2. Figure 2 In the example shown, the cosmetic laminate 100 is formed by laminating a cover coat 102 on a cosmetic layer 101. In this case, for example, the cosmetic layer 101 constitutes a base coat for gel artificial nails as a first artificial nail layer. The cover coat 102 may also serve as a color nail or a top nail.

[0134] Figure 3 2 is a schematic cross-sectional view showing a second example of a state where the cosmetic laminate 100 in the first embodiment is adhered to the nail 2. Figure 3 In the example shown, the cosmetic laminate 100 is formed by providing the cover coating 102 so as to cover the entire surface of the cosmetic layer 101. By providing the cover coating 102 so as to cover the entire surface of the cosmetic layer 101, when gas is generated due to external stimulation, the gas is not easy to escape from the cosmetic layer 101. Therefore, according to this configuration, the cosmetic laminate 100 can be more efficiently peeled from the nail 2. In this case, for example, the cosmetic layer 101 constitutes a base coat for gel artificial nails as the first artificial nail layer. The cover coating 102 can also serve as a color artificial nail or a top artificial nail.

[0135] Figure 4 2 is a schematic cross-sectional view showing a third example of a state where the cosmetic layered product 100 in the first embodiment is adhered to the nail 2. Figure 4In the cosmetic laminate 100 of the example shown, the cosmetic laminate 100, that is, the cosmetic layer 101 and the cover coat 102 constitute a base coat for gel artificial nails. The cosmetic laminate 100 as a base coat is adhered to the nail 2, and the gel artificial nail having the colored artificial nail 200 and the top artificial nail 300 is provided on the cosmetic laminate 100. When light such as ultraviolet light is used as an external stimulus, the light transmittance of the colored artificial nail is low, and sometimes the light cannot reach the nail 2 even if the light is irradiated. In this case, after the colored artificial nail 200 and the top artificial nail 300 are removed by grinding or the like to expose the cosmetic laminate 100, the stimulus such as ultraviolet light may be applied.

[0136] As mentioned above Figure 2 to Figure 4 As in the example shown, when the cosmetic layered product 100 in the first embodiment constitutes an artificial nail such as a gel artificial nail provided on a nail, the artificial nail can be manufactured by the following manufacturing method, for example.

[0137] The method for manufacturing an artificial nail in the first embodiment includes, for example:

[0138] Applying a resin composition for an artificial nail containing a stimuli-responsive material to a nail, and curing the resin composition for an artificial nail to form a first artificial nail layer bonded to the nail, wherein the stimuli-responsive material changes in volume due to an external stimulus (excluding an external stimulus due to contact with a solvent and an external stimulus due to contact with a solution); and

[0139] A cover coat layer having an opening ratio of 40% or less is formed on the first artificial nail layer.

[0140] The resin composition for artificial nails containing the stimuli-responsive material corresponds to the resin composition for cosmetics in the above-described embodiment 1. The details of the material of the cover coat layer and the like are also as described above.

[0141] like Figure 4 In the case of manufacturing an artificial nail having a further artificial nail layer such as a colored artificial nail on the cosmetic laminate 100, as in the example shown in FIG. 1 , the above-mentioned manufacturing method may also further include forming a second artificial nail layer on the cover coating. The second artificial nail layer is a colored artificial nail or a top artificial nail. A third artificial nail layer may also be formed on the second artificial nail layer. Figure 4 In the example shown, the second artificial nail layer corresponds to the colored artificial nail 200 , and the third artificial nail layer corresponds to the top artificial nail 300 .

[0142] [1-2. Operation]

[0143] In the cosmetic laminate 100 in the first embodiment that is bonded to a part of the living body, an external stimulus is applied to the cured product of the cosmetic resin composition contained in the cosmetic layer 101, causing the cured product to change in volume. Due to this volume change, the adhesive strength between the cosmetic layer 101 and the part of the living body 1 is reduced. In this way, the cosmetic laminate 100 can be easily peeled off from the living body at any timing by reducing the adhesive strength due to the application of the external stimulus. In addition, since the cosmetic laminate 100 in the first embodiment is provided with the cover coating 102, the force of the volume change of the cosmetic layer 101 effectively acts on the surface on the side of the living body 1, and the cosmetic laminate 100 can be efficiently peeled off from the living body 1.

[0144] Details of examples of stimuli that can be used as external stimuli are as described above.

[0145] Hereinafter, an example of the principle of a decrease in the adhesive strength between the cosmetic laminate 100 and the nail 2 when the cosmetic layer 101 of the cosmetic laminate 100 in the first embodiment is used as a primer layer for a gel artificial nail will be described.

[0146] Figure 5 Is the description Figure 2 1 is a schematic cross-sectional view showing an example of the principle of reducing the bonding strength between the cosmetic laminate 100 and the nail 2 when the cosmetic layer 101 of the cosmetic laminate 100 in Embodiment 1 is used as a base coat for gel artificial nails. Here, the case where the stimuli-responsive material contained in the cosmetic resin composition is a material that generates gas by external stimulation is described as an example. Figure 5 As shown in (a), before applying external stimulation, the cosmetic layer 101 firmly adheres the cosmetic laminate 100 to the surface of the nail 2. Figure 5 As shown in (b), when an external stimulus is applied to the cosmetic laminate 100 by the stimulus generator 10, the stimulus-responsive material contained in the cosmetic layer 101 generates gas, and bubbles 1011 are generated in the cosmetic layer 101, causing a volume change in the cosmetic layer 101. The bubbles 1011 are also generated at the interface 3 between the cosmetic layer 101 and the nail 2, and also cause a volume change in the cosmetic layer 101 at the bonding portion with the nail 2, resulting in a reduction in the actual contact area between the cosmetic layer 101 and the nail 2. When the cosmetic layer 101 causes a volume change due to the application of an external stimulus to the cosmetic layer 101, by providing a covering coating 102, the surface of the cosmetic layer 101 on the covering coating 102 side, that is, the surface 4 on the opposite side to the nail 2, is less likely to cause a volume change. As a result, the force of the volume change of the cosmetic layer 101 effectively acts on the surface 3 on the nail 2 side, as shown in FIG. Figure 5 As shown in (c) , the cosmetic layered product 100 is efficiently peeled off from the nail 2 .

[0147] exist Figure 4 In the case of the example shown, i.e., the example of the structure of the gel artificial nail having the color artificial nail 200 and the top artificial nail 300 provided on the cosmetic laminate 100, when using light such as ultraviolet light as an external stimulus, the light transmittance of the color artificial nail is low, and sometimes the light cannot fully reach the nail 2 even if it is irradiated. In this case, when the cosmetic laminate 100 is peeled off from the living body, after removing a part of the color artificial nail 200 and the top artificial nail 300 by grinding or the like to expose the cosmetic laminate 100, the stimulus such as ultraviolet light may be applied. The removal of the color artificial nail and the top artificial nail may be performed on the entire surface, or more than 80% of the area may be removed, more than 50% of the area may be removed, or more than 20% of the area may be removed. That is, the method of removing the artificial nail in this case is as follows, for example.

[0148] An example of an artificial nail removal method in embodiment 1 is a method for removing an artificial nail adhered to a nail, the artificial nail comprising a first artificial nail layer and a covering coating layer having an opening rate of 40% or less and disposed on the first artificial nail layer, the first artificial nail layer being formed by curing a resin composition for artificial nails containing a stimuli-responsive material, the stimuli-responsive material causing a volume change by an external stimulus (excluding an external stimulus caused by contact with a solvent and an external stimulus caused by contact with a solution), the method comprising applying an external stimulus to the first artificial nail layer, and removing the first artificial nail layer and the covering coating layer from the aforementioned nail.

[0149] The above-mentioned artificial nail also includes at least one other artificial nail layer (for example, a layer of colored artificial nail 200 and top artificial nail 300) stacked on the first artificial nail layer and the covering coating, and the above-mentioned method may also include: before applying external stimulation to the first artificial nail layer, removing at least a portion of the other artificial nail layers except the first artificial nail layer and the covering coating.

[0150] According to the artificial nail removal method described above, even when other artificial nail layers such as colored artificial nails are provided on the cosmetic laminate 100 , the cosmetic laminate 100 can be easily peeled off from the nail.

[0151] Figure 6 This is a schematic cross-sectional view for explaining an example of the artificial nail removal method in the first embodiment. Figure 6 The example shown is Figure 4 The example shown is a method for removing an artificial nail of a gel artificial nail having a colored artificial nail 200 and a top artificial nail 300 provided on a cosmetic laminate 100.

[0152] A cosmetic laminate 100 as a base coat is bonded to the nail 2, and a gel artificial nail 200 and a top artificial nail 300 are provided on the cosmetic laminate 100 (see Figure 6 (a)). The cosmetic laminate 100 includes a cosmetic layer 101 as a first artificial nail layer and a cover coating 102. Here, the case where the stimuli-responsive material contained in the cosmetic layer 101 is a material that generates gas by external stimulation is described as an example. Next, at least a portion of the color artificial nail 200 and the top artificial nail 300 is removed by grinding, for example, to expose the surface of the cosmetic laminate 100, that is, at least a portion of the cover coating 102 (see Figure 6 Next, the cosmetic layer 101 of the cosmetic layered product 100 is given an external stimulus by the stimulus generator 10 (see Figure 6 (c)). As a result, the stimuli-responsive material contained in the cosmetic layer 101 generates gas, and bubbles 1011 are generated in the cosmetic layer 101, resulting in a volume change of the cosmetic layer 101. As a result, the actual contact area between the cosmetic layer 101 and the nail 2 is reduced. As a result, the adhesive strength between the cosmetic layer 101 and the nail 2 is reduced, and the cosmetic laminate 100 is easily removed from the nail 2 (see Figure 6 (d)). The removal of colored artificial nails and top artificial nails can be as follows Figure 6 The removal may be performed on the entire surface as in the example shown in (b), but more than 80% of the area may be removed, more than 50% of the area may be removed, or more than 20% of the area may be removed.

[0153] [1-3. Effects, etc.]

[0154] As described above, the cosmetic laminate 100 in the first embodiment includes the cosmetic layer 101 and the covering coating 102 which are bonded to a part of the living body 1. The cosmetic layer 101 and the covering coating 102 are arranged so that the cosmetic layer 101 is located between the living body 1 and the covering coating 102 when the cosmetic laminate 100 is bonded to the living body 1. The cosmetic layer 101 includes a cosmetic resin composition containing a stimuli-responsive material, and is bonded to the part of the living body 1 through a cured product of the cosmetic resin composition, wherein the stimuli-responsive material changes in volume due to an external stimulus (excluding an external stimulus caused by contact with a solvent and an external stimulus caused by contact with a solution). The contact angle of water on the surface of the cured product of the cosmetic resin composition is 30° or more and 110° or less. The cosmetic layer 101 reduces the bonding strength to the part of the living body 1 through the volume change of the cured product of the cosmetic resin composition caused by applying an external stimulus to the cured product of the cosmetic resin composition. The covering coating 102 has an open porosity of 40% or less.

[0155] According to such a configuration, the cosmetic laminate in the first embodiment can be firmly adhered to a part of the living body and can be easily peeled off from the living body at any timing. The cosmetic laminate 100 in the first embodiment is provided with the cover coating 102 having an opening rate of 40% or less, so that the volume change of the surface of the cosmetic layer 101 on the cover coating 102 side, that is, the surface on the opposite side to the living body 1, is not likely to occur. As a result, the force of the volume change of the cosmetic layer 101 effectively acts on the surface on the living body 1 side, and the cosmetic laminate 100 can be efficiently peeled off from the living body 1.

[0156] In the first embodiment, the cover coating layer 102 may have a tensile modulus of 5 MPa or more. By setting the tensile modulus to 5 MPa or more, for example, when the volume of the cosmetic layer 101 increases due to an external stimulus, the cosmetic layer 101 is less likely to expand toward the surface opposite to the organism 1. As a result, the cosmetic laminate 100 is easily peeled off at the interface with the organism 1. In particular, it is believed that when gas is generated due to an external stimulus, the gas is easily diffused in the surface direction of the interface between the cosmetic laminate 100 and the organism 1. Therefore, the cosmetic laminate 100 is more easily peeled off at the interface with the organism 1.

[0157] In the first embodiment, the bonding strength between the cosmetic layer 101 and the cover coating 102 may be 0.05 N / cm 2 By making the bonding strength between the cosmetic layer 101 and the cover coating layer 102 0.05 N / cm 2 As described above, even when the cosmetic layer 101 changes in volume due to an external stimulus, the adhesion or bonding between the cover coating layer 102 and the cosmetic layer 101 is easily maintained. Thus, stress caused by the volume change of the cosmetic layer 101 can be efficiently applied to the interface between the cosmetic laminate 100 and the living body 1. Therefore, the effect of making the cosmetic laminate 100 more easily peelable at the interface with the living body 1 is obtained.

[0158] In the first embodiment, when the cured product of the cosmetic resin composition generates gas due to external stimulation and causes a volume change, that is, when the cosmetic layer 101 generates gas due to external stimulation, the cover coating layer 102 may have a volume of 1.5×10 8 cc / m 2 · Gas permeability of less than 24 hr·atm. By making the gas permeability of the cover coating 102 1.5×10 8 cc / m 2 At 24 hr·atm or less, the gas generated by external stimulation is not easily released to the outside of the cosmetic layer 101. This makes it easier to peel the cosmetic layer 100 from the living body 1.

[0159] In Embodiment 1, the external stimulus may be at least one selected from the group consisting of light, heat, magnetism, electricity, and external force. According to such a configuration, the cosmetic layered product 100 in Embodiment 1 is easier to peel off from the organism 1, and is less likely to cause direct damage to the organism 1 during peeling.

[0160] In Embodiment 1, the external stimulus may be light having a wavelength in the range of 280 nm or more and less than 400 nm. According to such a configuration, it is possible to prevent the adhesive strength between the cosmetic laminate 100 and the living body 1 from decreasing in normal life, and to achieve efficient peeling at any time with a simpler method, and further suppress damage to the living body.

[0161] In the first embodiment, the cover coating 102 may have a transmittance of 10% or more for light of any wavelength within the range of 280 nm or more and less than 400 nm. According to such a configuration, the external stimulus efficiently causes a volume change of the stimulus-responsive material in the cosmetic resin composition, and as a result, the adhesive strength between the cosmetic laminate 100 and a part of the living body 1 is efficiently reduced. That is, according to this configuration, the cosmetic laminate 100 in the first embodiment can be efficiently peeled off from the living body 1.

[0162] In Embodiment 1, the stimuli-responsive material may include an azide compound. With such a configuration, the cosmetic laminate 100 can have high releasability when a stimulus is applied and can also have excellent safety.

[0163] In Embodiment 1, the stimulus responsive material may include a glycidyl azide polymer. With such a configuration, the cosmetic laminate 100 can have high releasability when a stimulus is applied and can also have excellent safety.

[0164] In Embodiment 1, the cosmetic laminate 100 may contain the glycidyl azide polymer in an amount ranging from 0.5 mass % to 55 mass %. With such a configuration, the cosmetic laminate 100 can improve the releasability from the living body when an external stimulus is applied.

[0165] In Embodiment 1, the cosmetic layer 101 and the cover coating 102 may be in contact with each other. By providing the cover coating 102 in contact with the cosmetic layer 101, the sealing effect by the cover coating 102 can be more effectively exerted. Therefore, it is easier to peel the cosmetic laminate 100 from the living body 1.

[0166] In Embodiment 1, the cosmetic laminate 100 can be used for artificial nails or eyelash extensions. According to this configuration, it is possible to provide artificial nails or eyelash extensions having strong adhesive strength that can be continuously installed on a living body for several weeks.

[0167] An example of the method for manufacturing an artificial nail in Embodiment 1 includes:

[0168] Applying a resin composition for an artificial nail containing a stimuli-responsive material to a nail, and curing the resin composition for an artificial nail to form a first artificial nail layer bonded to the nail, wherein the stimuli-responsive material changes in volume due to an external stimulus (excluding an external stimulus due to contact with a solvent and an external stimulus due to contact with a solution); and

[0169] A cover coat layer having an opening ratio of 40% or less is formed on the first artificial nail layer.

[0170] According to this manufacturing method, it is possible to provide an artificial nail that can be firmly adhered to the nail and can be easily peeled off from the nail at any timing.

[0171] The method for manufacturing the artificial nail may further include, for example, forming a second artificial nail layer on the cover coat. The second artificial nail layer may be, for example, a colored artificial nail or a top artificial nail. According to this method, an artificial nail having a further artificial nail layer such as a colored artificial nail provided on the cosmetic laminate 100 may be manufactured.

[0172] The artificial nail removal method in embodiment 1 is, for example, an example of a method for removing an artificial nail adhered to a nail, the artificial nail comprising a first artificial nail layer and a covering coating layer having an opening rate of less than 40% and arranged on the first artificial nail layer, the first artificial nail layer being formed by curing a resin composition for artificial nails containing a stimuli-responsive material, the stimuli-responsive material causing a volume change by an external stimulus (wherein an external stimulus caused by contact with a solvent and an external stimulus caused by contact with a solution are excluded), the method comprising applying an external stimulus to the first artificial nail layer, and removing the first artificial nail layer and the covering coating layer from the nail.

[0173] In addition, in the above-mentioned artificial nail removal method, the above-mentioned artificial nail may also include at least one other artificial nail layer stacked on the first artificial nail layer and the covering coating. In this case, the above-mentioned method may include removing the aforementioned other artificial nail layers except the first artificial nail layer and the covering coating before applying external stimulation to the first artificial nail layer.

[0174] According to the above-described artificial nail removal method, even when other artificial nail layers such as colored artificial nails are provided on the cosmetic layered product, the cosmetic layered product can be easily peeled off from the nail.

[0175] (Implementation Method 2)

[0176] Below, use Figure 7 Implementation method 2 is described.

[0177] [2-1. Structure]

[0178] Figure 7 : is a cross-sectional view showing a covering coating layer 103 in Embodiment 2. The covering coating layer 103 in Embodiment 2 is a covering coating layer that covers at least a portion of the cosmetic layer that undergoes a volume change due to an external stimulus (excluding an external stimulus due to contact with a solvent and an external stimulus due to contact with a solution). The covering coating layer 103 has an open porosity of 40% or less and a tensile modulus of 5 MPa or more.

[0179] The covering coating layer 103 having an opening ratio of 40% or less in the second embodiment is provided so as to cover at least a portion of the cosmetic layer that undergoes a volume change due to an external stimulus, thereby making it difficult for the surface of the cosmetic layer on the side of the covering coating layer 103, that is, the surface on the opposite side to the living body to undergo a volume change. As a result, the covering coating layer 103 in the second embodiment allows the force of the volume change of the cosmetic layer to act effectively on the surface on the living body side, and the cosmetic layer can be efficiently peeled off from the living body.

[0180] In the second embodiment, the cover coating 103 has a tensile modulus of 5 MPa or more. By setting the tensile modulus to 5 MPa or more, for example, when the volume of the cosmetic layer increases due to an external stimulus, the cover coating 103 can suppress the expansion of the cosmetic layer to the surface opposite to the living body. As a result, the effect of easily peeling the cosmetic layer at the interface with the living body is obtained. In particular, it is considered that when gas is generated by applying an external stimulus, the effect of easily diffusing the gas in the surface direction of the interface between the cosmetic layer 101 and the living body 1 is obtained. Therefore, the effect of easily peeling the cosmetic laminate 100 at the interface with the living body 1 is obtained.

[0181] In Embodiment 2, the cover coating 103 may have a transmittance of 10% or more for light of any wavelength within the range of 280 nm or more and less than 400 nm. By making the cover coating 103 in Embodiment 2 have such a transmittance, when provided in a manner covering at least a portion of the cosmetic layer that changes in volume due to an external stimulus, the volume change of the cosmetic layer can be efficiently caused. As a result, the cover coating 103 in Embodiment 2 can efficiently reduce the adhesive strength between the cosmetic layer and a portion of the living body. That is, the cover coating 103 can efficiently peel the cosmetic layer from the living body. The cover coating 103 in Embodiment 2 may have a transmittance of 30% or more for light of any wavelength within the range of 280 nm or more and may have a transmittance of 50% or more. In the case of a transmittance of 30% or more, the external stimulus causes the volume change of the cosmetic layer more efficiently, and thus the adhesive strength between the cosmetic layer and the portion of the living body is more efficiently reduced. In the case of a transmittance of 50% or more, the external stimulus causes the volume change of the cosmetic layer more efficiently, and thus the adhesive strength between the cosmetic layer and the portion of the living body is further efficiently reduced.

[0182] The cover coating layer 103 in the second embodiment corresponds to the cover coating layer 102 of the cosmetic laminate 100 in the first embodiment. Therefore, the description of the cover coating layer 102 in the first embodiment can also be applied to the cover coating layer 103 in the second embodiment.

[0183] [2-2. Operation]

[0184] The covering coating 103 in the second embodiment can be used to efficiently peel off the cosmetic layer which is firmly bonded to the living body and changes in volume due to external stimulation from the living body. The covering coating 103 in the second embodiment is provided, for example, in a manner covering at least a portion of the above-mentioned cosmetic layer. The covering coating 103 in the second embodiment can also be formed on the cosmetic layer immediately after the cosmetic layer is formed, and after a period of normal life in a state of bonding to the living body as in the first embodiment, the cosmetic layer is subjected to external stimulation when it is desired to peel off the cosmetic layer from the living body, and the cosmetic layer is peeled off from the living body together with the cosmetic layer. Alternatively, the covering coating 103 can be provided on the cosmetic layer when the cosmetic layer is peeled off from the living body, and the covering coating 103 can be used only to peel off the cosmetic layer from the living body.

[0185] [2-3. Effects, etc.]

[0186] As described above, the covering coating 103 in the second embodiment is a covering coating that covers at least a portion of the cosmetic layer that changes in volume due to external stimulation. The covering coating 103 has an open porosity of 40% or less and a tensile modulus of 5 MPa or more. By having such a configuration, the covering coating 103 in the second embodiment can effectively cause the force of the volume change of the cosmetic layer to act on the surface on the living body side, and efficiently peel the cosmetic layer from the living body.

[0187] In Embodiment 2, the cover coating 103 may have a transmittance of 10% or more for light of any wavelength in the range of 280 nm or more and less than 400 nm. With such a configuration, when the cover coating 103 in Embodiment 2 is provided so as to cover at least a portion of the cosmetic layer that undergoes a volume change due to an external stimulus, the cosmetic layer can be efficiently peeled off from the living body.

[0188] (Other embodiments)

[0189] As described above, the embodiments are described as examples of the technology disclosed in this application. However, the technology in the present disclosure is not limited thereto, and can also be applied to embodiments that have been changed, replaced, added, omitted, etc. In addition, the various constituent elements described in the above embodiments can also be combined as new embodiments.

[0190] Therefore, other embodiments are exemplified below.

[0191] In the first embodiment, as a method for removing artificial nails, it is described that the covering coating 102 is formed on the cosmetic layer 101 immediately after the cosmetic layer 101 is formed, and after a period of normal life, the covering coating 102 is peeled off from the living body 1 together with the cosmetic layer 101 when peeling off the cosmetic layer 101. However, the covering coating 102 may be formed immediately before the cosmetic layer 101 is removed.

[0192] When the cover coat layer 102 is formed immediately before the cosmetic layer 101 is removed, the method of removing the artificial nail adhered to the nail is as follows, for example.

[0193] In the method for removing an artificial nail, the artificial nail includes a first artificial nail layer, the first artificial nail layer is formed by curing an artificial nail resin composition containing a stimuli-responsive material, the stimuli-responsive material causing a volume change by an external stimulus, the method comprising: forming a covering coating having an opening rate of 40% or less on the surface of the exposed first artificial nail layer; and applying an external stimulus to the first artificial nail layer to remove the first artificial nail layer and the covering coating from the nail.

[0194] The artificial nail may further include at least one other artificial nail layer (e.g., a layer of a colored artificial nail 200 and a top artificial nail 300) stacked on the first artificial nail layer, and the method may further include removing the other artificial nail layers to expose at least a portion of the surface of the first artificial nail layer before forming the covering coating.

[0195] According to the artificial nail removal method described above, even when other artificial nail layers such as colored artificial nails are provided on the cosmetic laminate 100 , the cosmetic laminate 100 can be easily peeled off from the nail.

[0196] As in the above-mentioned artificial nail removal method, by providing a cover coating immediately before peeling the cosmetic layer from the living body, a cover coating dedicated to peeling properties can be provided without being affected by the properties required for use such as long-term adhesion. Therefore, it is easy to achieve both strong adhesion and peeling properties.

[0197] Figure 8 This is a schematic cross-sectional view for explaining an example of a method for removing an artificial nail in another embodiment.

[0198] A cosmetic layer 101 as a base coat is bonded to the nail 2, and a gel artificial nail 200 and a top artificial nail 300 are provided on the cosmetic layer 101 (see Figure 8 Here, the case where the stimuli-responsive material contained in the cosmetic layer 101 is a material that generates gas by external stimulation is described as an example. Next, for example, the colored artificial nail 200 and the top artificial nail 300 are removed by grinding to expose at least a portion of the surface of the cosmetic layer 101 (see Figure 8 Next, a covering coating 102 is formed on the exposed cosmetic layer 101 (see Figure 8 Next, the cosmetic layer 101 is given an external stimulus by the stimulus generator 10 (see Figure 8 (d)). As a result, the stimuli-responsive material contained in the cosmetic layer 101 generates gas, bubbles are generated in the cosmetic layer 101, and the volume of the cosmetic layer 101 changes. As a result, the actual contact area between the cosmetic layer 101 and the nail 2 is reduced. As a result, the adhesive strength between the cosmetic layer 101 and the nail 2 is reduced, and the cosmetic layer 101 and the cover coating 102 are easily removed from the nail 2 (see Figure 8 (e)). The removal of colored artificial nails and top artificial nails can be as follows Figure 8 The removal may be performed on the entire surface as in the example shown in (b), but more than 80% of the area may be removed, more than 50% of the area may be removed, or more than 20% of the area may be removed.

[0199] In Embodiment 1, the cosmetic laminate 100 is described as an example of the cosmetic laminate of the present disclosure. As described in Embodiment 1, the cosmetic laminate 100 in Embodiment 1 includes a cosmetic layer 101 and a cover coating 102 that are bonded to a portion of a living body 1. The cosmetic layer 101 and the cover coating 102 are arranged so that the cosmetic layer 101 is located between the living body 1 and the cover coating 102 when the cosmetic laminate 100 is bonded to the living body 1. The cosmetic layer 101 includes a cosmetic resin composition containing a stimuli-responsive material that changes volume due to an external stimulus, and is bonded to the portion of the living body 1 through a cured product of the cosmetic resin composition. The contact angle of water on the surface of the cured product of the cosmetic resin composition is 30° or more and 110° or less. The cosmetic layer 101 reduces the bonding strength to the portion of the living body 1 by the volume change of the cured product of the cosmetic resin composition caused by applying an external stimulus to the cured product of the cosmetic resin composition. The cover coating 102 has an open porosity of 40% or less.

[0200] The cosmetic laminate according to another embodiment of the present disclosure may be a cosmetic laminate having the following structure instead of the cosmetic laminate 100:

[0201] A cosmetic laminate, comprising: a cosmetic layer bonded to a part of a living body, and a covering coating, wherein the cosmetic layer and the covering coating are arranged such that the cosmetic layer is located between the living body and the covering coating when the cosmetic laminate is bonded to the living body, the cosmetic layer comprises a cosmetic resin composition containing a stimuli-responsive material, and is bonded to the part of the living body via a cured product of the cosmetic resin composition, the stimuli-responsive material generates gas due to an external stimulus (excluding external stimuli due to contact with a solvent and external stimuli due to contact with a solution), the adhesive strength of the cosmetic layer to the part of the living body is reduced due to the volume change of the cured product caused by the external stimulus applied to the cured product of the cosmetic resin composition, and the covering coating has a thickness of 1.5×10 8 cc / m 2 Gas permeability below 24hr·atm.

[0202] In the above-mentioned cosmetic laminate, the contact angle of water on the surface of the cured product of the cosmetic resin composition can be greater than 30° and less than 110°, thereby improving the adhesion between the cured product of the cosmetic resin composition and the organism, and the cured product can be stably adhered to the organism for a longer period of time.

[0203] The various structures of the cosmetic laminate 100, the cosmetic layer 101, and the cover coating layer 102 in Embodiment 1 and the description of these structures in Embodiment 1 described in Embodiment 1 can also be applied to the cosmetic laminate.

[0204] It should be noted that the above-described embodiments are provided to illustrate the technology in the present disclosure, and therefore various changes, substitutions, additions, omissions, etc. may be made within the scope of the claims or their equivalents.

[0205] (Note)

[0206] The following techniques are disclosed through the description of the above embodiments.

[0207] (Technology 1)

[0208] A cosmetic laminate comprising:

[0209] A cosmetic layer bonded to a part of a living body, and

[0210] Covering coating,

[0211] The cosmetic layer and the covering coating are arranged such that the cosmetic layer is located between the living body and the covering coating when the cosmetic layered product is bonded to the living body.

[0212] The cosmetic layer comprises a cosmetic resin composition containing a stimuli-responsive material, and is bonded to the part of the living body via a cured product of the cosmetic resin composition, wherein the stimuli-responsive material changes in volume due to an external stimulus (excluding an external stimulus due to contact with a solvent and an external stimulus due to contact with a solution).

[0213] The contact angle of water on the surface of the cured product of the cosmetic resin composition is 30° or more and 110° or less,

[0214] The adhesive strength of the cosmetic layer to the part of the living body is reduced due to a volume change of the cured product of the cosmetic resin composition caused by applying the external stimulus to the cured product,

[0215] The aforementioned covering coating has an open porosity of 40% or less.

[0216] With this configuration, the cosmetic laminate in the technique 1 can be firmly bonded to a part of the living body and can be easily peeled off from the living body at any timing. The cosmetic laminate in the technique 1 is provided with a covering coating having an opening ratio of 40% or less, so that the surface of the cosmetic layer on the covering coating side, that is, the surface on the opposite side to the living body, is less likely to cause a volume change. As a result, the force of the volume change of the cosmetic layer is effectively exerted on the surface on the living body side, and the cosmetic laminate can be efficiently peeled off from the living body.

[0217] (Technique 2)

[0218] The cosmetic laminate according to the first aspect, wherein the cured product of the cosmetic resin composition undergoes a volume change by generating gas due to the external stimulus, and the cover coating has a volume of 1.5×10 8 cc / m 2 Gas permeability below 24hr·atm.

[0219] With this configuration, the cosmetic layered product can be more easily peeled off from the living body.

[0220] (Technique 3)

[0221] A cosmetic laminate comprising:

[0222] A cosmetic layer bonded to a part of a living body, and

[0223] Covering coating,

[0224] The cosmetic layer and the covering coating are arranged such that the cosmetic layer is located between the living body and the covering coating when the cosmetic layered product is bonded to the living body.

[0225] The cosmetic layer comprises a cosmetic resin composition containing a stimuli-responsive material, and is bonded to the part of the living body via a cured product of the cosmetic resin composition, wherein the stimuli-responsive material changes in volume by generating gas in response to an external stimulus (excluding an external stimulus caused by contact with a solvent and an external stimulus caused by contact with a solution).

[0226] The adhesive strength of the cosmetic layer to the part of the living body is reduced due to a volume change of the cured product of the cosmetic resin composition caused by applying the external stimulus to the cured product,

[0227] The aforementioned covering coating has a 1.5×10 8 cc / m 2 Gas permeability below 24hr·atm.

[0228] With this configuration, the cosmetic laminate in the third technique can be firmly bonded to a part of the living body and can be easily peeled off from the living body at any timing. 8 cc / m 2 In a cover coating with a gas permeability of 24 hr·atm or less, the force of volume change of the cosmetic layer is effectively exerted on the surface on the living body side, and the cosmetic layered product can be efficiently peeled from the living body.

[0229] (Technique 4)

[0230] The cosmetic layered product according to technology 3, wherein a contact angle of water on the surface of the cured product of the cosmetic resin composition is 30° or more and 110° or less.

[0231] With this configuration, the cosmetic layered product in Technique 4 can be more firmly bonded to a part of the living body.

[0232] (Technique 5)

[0233] The cosmetic layered product according to any one of Techniques 1 to 4, wherein the cover coating layer has a tensile modulus of 5 MPa or more.

[0234] With this configuration, when the volume of the cosmetic layer increases due to external stimulation, for example, the cosmetic layer is less likely to expand toward the surface opposite to the living body. As a result, the cosmetic layered product is easily peeled off at the interface with the living body.

[0235] (Technique 6)

[0236] The cosmetic layered product according to any one of the techniques 1 to 5, wherein the bonding strength between the cosmetic layer and the cover coating layer is 0.05 N / cm 2 above.

[0237] With this configuration, stress caused by the volume change of the cosmetic layer can be efficiently applied to the interface between the cosmetic laminate and the living body. Therefore, the cosmetic laminate can be more easily peeled off at the interface with the living body.

[0238] (Technique 7)

[0239] The cosmetic layered product according to any one of Techniques 1 to 6, wherein the external stimulus is at least one selected from the group consisting of light, heat, magnetism, electricity, and external force.

[0240] With this configuration, the cosmetic layered product can be peeled off from the living body more easily, and is less likely to cause direct damage to the living body during peeling.

[0241] (Technology 8)

[0242] The cosmetic layered product according to technology 7, wherein the external stimulus is light having a wavelength in the range of 280 nm to less than 400 nm.

[0243] This configuration can prevent the adhesive strength between the cosmetic layered product and the living body from decreasing in normal life, and can achieve efficient peeling at an arbitrary timing by a simpler method, and can further suppress damage to the living body.

[0244] (Technique 9)

[0245] The cosmetic layered product according to technology 8, wherein the cover coating layer has a transmittance of 10% or more with respect to light of any wavelength within a range of 280 nm to less than 400 nm.

[0246] This configuration enables the cosmetic layered product to be efficiently peeled off from the living body.

[0247] (Technology 10)

[0248] The cosmetic layered product according to any one of Techniques 1 to 9, wherein the stimuli-responsive material comprises an azide compound.

[0249] With this configuration, the cosmetic layered product can have high releasability when stimulated and also have excellent safety.

[0250] (Technology 11)

[0251] The cosmetic laminate according to technique 10, wherein the stimuli-responsive material comprises a glycidyl azide polymer.

[0252] With this configuration, the cosmetic layered product can have high releasability when stimulated and also have excellent safety.

[0253] (Technology 12)

[0254] The cosmetic laminate according to technology 11, wherein the cosmetic resin composition contains the glycidyl azide polymer in a range of 0.5 mass % to 55 mass %.

[0255] With this configuration, the cosmetic layered product can be improved in its releasability from the living body when an external stimulus is applied.

[0256] (Technology 13)

[0257] The cosmetic layered product according to any one of Techniques 1 to 12, wherein the cosmetic layer and the cover coating layer are in contact with each other.

[0258] By providing the cover coat layer in contact with the cosmetic layer, the sealing effect of the cover coat layer can be more effectively exerted, thereby making it easier to peel the cosmetic layered product from the living body.

[0259] (Technology 14)

[0260] The cosmetic laminate according to any one of Techniques 1 to 13, wherein the cosmetic laminate is used for artificial nails or eyelash extensions.

[0261] With this configuration, it is possible to provide an artificial nail or eyelash extension having strong adhesive strength that allows it to be continuously installed on a living body for several weeks.

[0262] (Technology 15)

[0263] A covering coating layer covering at least a portion of a cosmetic layer that undergoes a volume change by an external stimulus (wherein an external stimulus caused by contact with a solvent and an external stimulus caused by contact with a solution are excluded),

[0264] The aforementioned covering coating has an open porosity of 40% or less and a tensile modulus of 5 MPa or more.

[0265] With this configuration, the cover coating layer allows the force of volume change of the cosmetic layer to act effectively on the surface on the living body side, and can efficiently peel the cosmetic layer from the living body.

[0266] (Technology 16)

[0267] The covering coating according to the fifth aspect has a transmittance of 10% or more with respect to light of any wavelength in the range of 280 nm to less than 400 nm.

[0268] According to this configuration, when the cover coating layer is provided so as to cover at least a portion of the cosmetic layer that changes in volume due to an external stimulus, the cosmetic layer can be efficiently peeled off from the living body.

[0269] (Technology 17)

[0270] A method for manufacturing an artificial nail, comprising:

[0271] Applying a resin composition for an artificial nail containing a stimuli-responsive material to a nail, and curing the resin composition for an artificial nail to form a first artificial nail layer bonded to the nail, wherein the stimuli-responsive material changes in volume due to an external stimulus (excluding an external stimulus due to contact with a solvent and an external stimulus due to contact with a solution); and

[0272] A cover coat layer having an opening ratio of 40% or less is formed on the first artificial nail layer.

[0273] According to this manufacturing method, it is possible to provide an artificial nail that can be firmly adhered to the nail and can be easily peeled off from the nail at any timing.

[0274] (Technology 18)

[0275] The method for manufacturing an artificial nail according to technology 17 further includes forming a second artificial nail layer on the aforementioned cover coating.

[0276] The second artificial nail layer is a colored artificial nail or a top artificial nail.

[0277] According to this method, it is possible to manufacture an artificial nail in which a further artificial nail layer such as a colored artificial nail is provided on the cosmetic layered product.

[0278] (Technology 19)

[0279] A method for removing artificial nails, which is a method for removing artificial nails adhered to the nails.

[0280] The artificial nail comprises a first artificial nail layer, wherein the first artificial nail layer is formed by curing an artificial nail resin composition containing a stimuli-responsive material, wherein the stimuli-responsive material changes in volume in response to an external stimulus (excluding an external stimulus caused by contact with a solvent and an external stimulus caused by contact with a solution).

[0281] The aforementioned method includes:

[0282] forming a cover coating layer having an opening rate of 40% or less on the surface of the exposed first artificial nail layer; and

[0283] The external stimulus is applied to the first artificial nail layer, and the first artificial nail layer and the cover coat layer are removed from the nail.

[0284] According to this method, even when other artificial nail layers such as colored artificial nails are provided on the cosmetic laminate, the cosmetic laminate 100 can be easily peeled off from the nail.

[0285] (Technology 20)

[0286] According to the artificial nail removal method of technology 19, the artificial nail further includes at least one other artificial nail layer stacked on the first artificial nail layer,

[0287] The method further includes removing at least a portion of the other artificial nail layer to expose at least a portion of the surface of the first artificial nail layer before forming the cover coat layer.

[0288] According to this method, even when other artificial nail layers such as colored artificial nails are provided on the cosmetic laminate, the cosmetic laminate 100 can be easily peeled off from the nail.

[0289] (Technology 21)

[0290] A method for removing artificial nails, which is a method for removing artificial nails adhered to the nails.

[0291] The artificial nail comprises a first artificial nail layer and a cover coating layer disposed on the first artificial nail layer and having an opening rate of 40% or less, wherein the first artificial nail layer is formed by curing a resin composition for an artificial nail containing a stimuli-responsive material, wherein the stimuli-responsive material changes in volume in response to an external stimulus (excluding an external stimulus caused by contact with a solvent and an external stimulus caused by contact with a solution).

[0292] The method includes applying the external stimulus to the first artificial nail layer, and removing the first artificial nail layer and the cover coat layer from the nail.

[0293] According to this method, even when other artificial nail layers such as colored artificial nails are provided on the cosmetic laminate, the cosmetic laminate can be easily peeled off from the nail.

[0294] (Technology 22)

[0295] The artificial nail removal method according to technique 21, wherein the artificial nail further comprises at least one other artificial nail layer stacked on the first artificial nail layer and the cover coating layer,

[0296] The method further includes removing at least a portion of the other artificial nail layers other than the first artificial nail layer and the cover coat layer before applying the external stimulus to the first artificial nail layer.

[0297] According to this method, even when other artificial nail layers such as colored artificial nails are provided on the cosmetic laminate, the cosmetic laminate can be easily peeled off from the nail.

[0298] Example

[0299] The cosmetic laminate of the present disclosure will be described in more detail by way of examples. The cosmetic laminate of the present disclosure is not limited to the following examples.

[0300] [Evaluation of the change rate of adhesive strength before and after ultraviolet light irradiation]

[0301] (Sample 1)

[0302] As a stimuli-responsive material that changes volume when ultraviolet light is applied, a glycidyl azide polymer (GAP manufactured by NOF Corporation) was used. The glycidyl azide polymer has the property of releasing nitrogen gas when irradiated with light in a wavelength range of about 400 nm or less.

[0303] A glycidyl azide polymer was added to a gel artificial nail obtained by mixing 99% by mass of a urethane methacrylate polymer (manufactured by Kyoeisha Chemical Co., Ltd.) and 1% by mass of diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide so as to have a solid content concentration of 20% by mass, and the mixture was mixed thoroughly to prepare a resin composition for cosmetics. The fact that the gel artificial nail and the glycidyl azide polymer were mixed thoroughly and uniformly with each other was confirmed by making the light transmission state uniform in the obtained resin composition for cosmetics. The density of the glycidyl azide polymer was 1.3 g / cm 3 The commercially available gel artificial nails used have a density of about 1.1 g / cm 3 , so the volume ratio of 20 wt % of the glycidyl azide polymer is 17.5 vol %.

[0304] The cosmetic resin composition of this sample is applied by gap coating with a thickness of 100 μm on the substrate. Using a lamp for curing gel artificial nails, the obtained coating film is irradiated with light emitting diode output light of a wavelength of 390 nm to 400 nm (hereinafter referred to as "LED output light") for 2 minutes. Thus, the coating film formed by the cosmetic resin composition on the substrate is cured. Thus, a cosmetic layer formed by the cosmetic resin composition is produced. As a substrate, a polyethylene terephthalate film is used. Hereinafter, polyethylene terephthalate is referred to as "PET". It should be noted that, in general, when artificial nails are applied to nails, nails are degreased in order to improve the adhesion between the nails and the artificial nails. The PET film has a contact angle close to the contact angle of the degreased nails, so it is believed that for the cosmetic laminate of this sample, an evaluation of the bonding strength close to the nails can be performed. Here, the contact angle of water on the surface of the nail when the nail is degreased is approximately 60° to 75°, while the contact angle of water on the PET film used for evaluation is 62°.

[0305] The covering coating is made using a gel artificial nail obtained by mixing 99% by mass of a urethane methacrylate polymer (manufactured by Kyoeisha Chemical Co., Ltd.) and 1% by mass of diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide. The above-mentioned gel artificial nail for the covering coating is applied on the cosmetic layer by gap coating with a thickness of 100 μm. Using a lamp for curing the gel artificial nail, the obtained coating film is irradiated with LED output light with a wavelength of 390nm to 400nm for 2 minutes. Thus, the coating film formed by the above-mentioned gel artificial nail on the cosmetic layer is cured. Thus, a covering coating formed by the above-mentioned gel artificial nail is prepared, and a cosmetic laminate bonded to the substrate is obtained. The covering coating covers the entire surface of the cosmetic layer, and the area analysis is performed using an image using an optical microscope photograph, and the result shows that the porosity is less than 1%. For subsequent samples, the porosity of the covering coating is also calculated using the same method as sample 1.

[0306] The cover coating prepared by the above method has an ultraviolet light transmittance of 93% at a wavelength of 340nm, an elastic modulus of 1153MPa, and a N2 gas transmittance of 2.7cc / m 2 ·24hr·atm. The bonding strength between the cosmetic layer and the cover coating is 20N / cm 2 It should be noted that the elastic modulus of the cover coating was measured by a method in accordance with JIS K 7113. In addition, the adhesive strength between the cosmetic layer and the cover coating was determined as follows: 2 The cosmetic layer and the covering coating are bonded to form a test sample with an area of ​​​​1000 square meters. The covering coating is stretched at a speed of 60 mm / min in a direction perpendicular to the bonding surface using a tensile tester (IMADA Co., Ltd., MX2-500N-FA), and the maximum load during peeling is measured using a digital dynamometer (IMADA Co., Ltd. ZTA), thereby determining the bonding strength between the cosmetic layer and the covering coating. The gas permeability of the covering coating is measured by a method based on the differential pressure method (JIS K7126-1). The ultraviolet transmittance is measured using a spectrophotometer (Jasco V-770). For subsequent samples, various measurements are also performed by the same method as sample 1.

[0307] The adhesive strength of the cosmetic laminate obtained from this sample was measured. As the measurement sample, a cosmetic laminate having a size of 10×15 mm and bonded to a substrate was used. The adhesive strength when the cosmetic laminate was peeled off from the substrate at a speed of 20 mm / min was measured using a digital dynamometer (ZTA manufactured by IMADA Co., Ltd.).

[0308] Furthermore, other measurement samples prepared in the same manner were irradiated with 5 J / cm 2Ultraviolet light. To irradiate ultraviolet light, an LED lamp (manufactured by DOWA) with a central peak at a wavelength of 340 nm was used. The intensity of ultraviolet light was measured using a UV LIGHT METER (manufactured by CUSTOM CORPORATION, UV-37SD), and the irradiation time was adjusted so that the irradiation amount of ultraviolet light was 5 J / cm 2 For irradiation of 5J / cm 2 The adhesive strength of the sample after UV irradiation was measured by the same method as the adhesive strength of the sample not irradiated with UV. 2 The bonding strength after ultraviolet light irradiation was 8.4% when the bonding strength before ultraviolet light irradiation was set as 100%.

[0309] (Sample 2)

[0310] As the cover coat, a gel artificial nail obtained by mixing 59 mass % of urethane methacrylate polymer (manufactured by Kyoeisha Chemical Co., Ltd.), 40 mass % of polyethylene glycol monomethyl ether methacrylate, and 1 mass % of diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide was used. Except for this, the cosmetic laminate of sample 2 was prepared in the same manner as sample 1. The cover coat had an ultraviolet light transmittance of 93% at a wavelength of 340 nm, an elastic modulus of 254 MPa, and a N2 gas transmittance of 81 cc / m 2 ·24hr·atm. The bonding strength between the cosmetic layer and the cover coating is 20N / cm 2 The gas permeability of the coating layer was measured by a method in accordance with the differential pressure method (JIS K7126-1).

[0311] The covering coating covers the entire surface of the cosmetic layer and has an open porosity of less than 1%.

[0312] The adhesive strength of the cosmetic laminate to the substrate before and after ultraviolet irradiation was evaluated by the same evaluation method as Sample 1. For the cosmetic laminate of Sample 2, the adhesive strength ratio after ultraviolet irradiation was 7.4%, with the ratio before ultraviolet irradiation being 100%.

[0313] (Sample 3)

[0314] As the covering coating, a polycarbonate membrane filter (TSTP14250 manufactured by Merck, with an opening rate of 23%) was used. After the polycarbonate membrane filter was placed on the cosmetic layer, a load of 1 kg was applied to make the membrane filter and the cosmetic layer close to each other. The cosmetic laminate of Sample 3 was prepared in the same manner as Sample 1 except for the above.

[0315] The cover coating formed using the polycarbonate membrane filter has an ultraviolet light transmittance of 41% at a wavelength of 340 nm, an elastic modulus of 602 MPa, and a N2 gas transmittance of 1.4×10 8 cc / m 2 ·24hr·atm. In addition, the bonding strength between the cosmetic layer and the cover coating is 0.6N / cm 2 The gas permeability of the coating layer was measured by an isobaric method (JIS K7126-2).

[0316] The adhesive strength of the cosmetic laminate to the substrate before and after ultraviolet irradiation was evaluated by the same evaluation method as Sample 1. The adhesive strength ratio after ultraviolet irradiation was 12% when the ratio before ultraviolet irradiation was 100%.

[0317] (Sample 21)

[0318] The cosmetic layer was prepared using the gel artificial nail used in Sample 1 without adding the glycidyl azide polymer. No cover coat was prepared. That is, in Sample 21, only the cosmetic layer was prepared using the gel artificial nail used in Sample 1.

[0319] The adhesive strength of the cosmetic layer made of the gel artificial nail base to the substrate before and after ultraviolet irradiation was evaluated by the same evaluation method as Sample 1. When the adhesive strength before ultraviolet irradiation was 100%, the adhesive strength ratio after ultraviolet irradiation was 103%.

[0320] (Sample 22)

[0321] A cosmetic layer was formed on the substrate by the same method as in Sample 1. However, no cover coat layer was formed. That is, in Sample 22, only the cosmetic layer of Sample 1 was formed on the substrate.

[0322] The adhesive strength of the cosmetic layer to the substrate before and after ultraviolet irradiation was evaluated by the same evaluation method as Sample 1. When the adhesive strength before ultraviolet irradiation was 100%, the adhesive strength ratio after ultraviolet irradiation was 30%.

[0323] (Sample 23)

[0324] A cosmetic laminate was prepared in the same manner as Sample 3 except that a polyethylene terephthalate mesh (manufactured by ASONE, with an opening ratio of 63%) was used as the cover coat. The adhesive strength between the cosmetic layer and the cover coat measured in the same manner as Sample 1 was 0.01 N / cm 2 The transmittance of ultraviolet light at a wavelength of 340 nm of the polyethylene terephthalate mesh is 64%, and the transmittance of N2 gas is 2.5×10 8 cc / m 2·24 hr·atm. The elastic modulus of the polyethylene terephthalate mesh is 126 MPa. The gas permeability of the coating layer is measured by a method based on the isobaric method (JIS K7126-2).

[0325] The adhesive strength of the cosmetic laminate to the substrate before and after ultraviolet irradiation was evaluated by the same evaluation method as Sample 1. For the cosmetic laminate of Sample 23, the adhesive strength ratio after ultraviolet irradiation was 31%, with the ratio before ultraviolet irradiation being 100%.

[0326] (Sample 24)

[0327] A cosmetic laminate was prepared in the same manner as Sample 3 except that a PTFE punching sheet (manufactured by ASONE, with an opening ratio of 41%) was used as the cover coat. The adhesive strength between the cosmetic layer and the cover coat measured in the same manner as Sample 1 was 0.03 N / cm 2 The transmittance of ultraviolet light of wavelength 340nm of the PTFE punching sheet is 24%. The elastic modulus of the covering coating is 91MPa.

[0328] The adhesive strength of the cosmetic laminate to the substrate before and after ultraviolet irradiation was evaluated by the same evaluation method as Sample 1. For the cosmetic laminate of Sample 24, the adhesive strength ratio after ultraviolet irradiation was 36%, with the ratio before ultraviolet irradiation being 100%.

[0329] Fig. 9 It is a graph showing the evaluation results of the bonding strength ratio before and after ultraviolet irradiation of samples 1 to 3 and samples 21 to 24. It can be seen that the bonding strength of sample 21, which made a cosmetic layer using a cosmetic resin composition that does not contain a glycidyl azide polymer, hardly changed before and after ultraviolet irradiation. The bonding strength of sample 22 decreased after ultraviolet irradiation. However, it can be seen that in the cosmetic laminates provided with a covering coating with an opening rate of less than 23% of samples 1 to 3, the bonding strength after ultraviolet irradiation is lower than that of sample 22. For a covering coating with an opening rate of 63% such as sample 23 and a covering coating with an opening rate of 41% such as sample 24, the effect of further reducing the bonding strength after ultraviolet irradiation is not obtained compared with sample 22 without a covering coating.

[0330] [Bubble Area Ratio Evaluation]

[0331] In a cosmetic layer formed using a resin composition for cosmetics containing a glycidyl azide polymer, the present inventors have confirmed a tendency that the more bubbles generated during ultraviolet irradiation spread in the surface direction of the cosmetic layer, the lower the peel strength after ultraviolet irradiation. Hereinafter, the extent to which bubbles spread in the surface direction of the cosmetic layer when a cover coating is provided is evaluated compared to a case where no cover coating is provided.

[0332] (Sample 25)

[0333] A glass slide was used as a substrate. A commercially available PREGEL base gel artificial nail made by PREANFA CO., LTD., which has a urethane acrylate oligomer as a main component, was used, and a glycidyl azide polymer was added thereto so that the solid content concentration was 20% by mass, and the mixture was fully mixed to prepare a resin composition for cosmetics. The base gel artificial nail and the glycidyl azide polymer were fully mixed with each other to become uniform, which was confirmed by making the light transmission state uniform in the obtained resin composition for cosmetics. The density of the glycidyl azide polymer is 1.3 g / cm 3 The commercially available base gel artificial nail used has a density of about 1.1 g / cm 3 , so the volume ratio of 20 wt % of the glycidyl azide polymer is 17.5 vol %. The cosmetic layer was prepared in the same manner as Sample 1 except that a 15 mm × 30 mm cosmetic layer was prepared by gap coating with a thickness of 200 μm on the substrate. However, no cover coating was prepared. That is, in Sample 25, only a cosmetic layer was formed on the substrate.

[0334] The cosmetic layer formed on the substrate is irradiated with UV light at 10 J / cm 2 The ultraviolet light was irradiated using an LED lamp (manufactured by DOWA) with a central peak at a wavelength of 340 nm. The intensity of the ultraviolet light was measured using a UV LIGHT METER (manufactured by CUSTOM CORPORATION, UV-37SD), and the irradiation time was adjusted to a value of 10 J / cm 2 After the ultraviolet light irradiation, it was confirmed that bubbles were generated in the cosmetic layer.

[0335] (Sample 4)

[0336] A glass slide was used as a substrate. A cosmetic layer of 15 mm × 30 mm was made on the substrate. Then, a covering coating was made on the cosmetic layer with a larger area than the cosmetic layer. The cosmetic layer was made in the same way as sample 25, and the covering coating was made in the same way as sample 1. The bonding strength between the cosmetic layer and the covering coating was 20 N / cm 2 above.

[0337] The cosmetic layer laminate consisting of the cosmetic layer and the cover coating layer prepared on the substrate was irradiated with ultraviolet light at 10 J / cm 2 For ultraviolet irradiation, an LED lamp with a central peak at a wavelength of 340 nm (manufactured by DOWA) was used. The intensity of ultraviolet light was measured using a UV LIGHT METER (manufactured by CUSTOM CORPORATION, UV-37SD), and the irradiation time was adjusted so that the irradiation amount of ultraviolet light was 10 J / cm 2 . After ultraviolet light irradiation, it was confirmed that bubbles were generated in the cosmetic layer. The value obtained by dividing the area of ​​bubbles generated in Sample 4 by the area of ​​bubbles generated in Sample 25, that is, the ratio of the bubble area of ​​Sample 4 with a covering coating to the bubble area without a covering coating is 3.8 times. Hereinafter, the ratio of the bubble area of ​​Sample 4 with a covering coating to the bubble area without a covering coating is defined as the bubble area ratio. It should be noted that, with respect to the area of ​​bubbles generated in the cosmetic layer, a photograph of the cosmetic layer is taken, and image analysis of the bubble generating area is performed, thereby determining the bubble area ratio.

[0338] (Sample 5)

[0339] A glass slide was used as a substrate. A cosmetic layer of 15 mm × 30 mm was made on the substrate. Then, a covering coating was made on the cosmetic layer with a larger area than the cosmetic layer. The method for making the cosmetic layer was the same as that of sample 25, and the method for making the covering coating was the same as that of sample 2. The bonding strength between the cosmetic layer and the covering coating was 20 N / cm 2 above.

[0340] The ratio of the bubble area of ​​Sample 5 with the coating to the bubble area of ​​Sample 25 without the coating (bubble area ratio) was determined by the same method as Sample 4. The bubble area ratio of Sample 5 was 4.1 times.

[0341] (Sample 6)

[0342] A glass slide was used as a substrate. A cosmetic layer of 15 mm × 30 mm was made on the substrate. Then, a covering coating was made on the cosmetic layer with a larger area than the cosmetic layer. The method for making the cosmetic layer was the same as that of sample 25, and the method for making the covering coating was the same as that of sample 3. The bonding strength between the cosmetic layer and the covering coating was 1.0 N / cm 2 .

[0343] The ratio of the bubble area of ​​Sample 6 with the coating to the bubble area of ​​Sample 25 without the coating (ie, the bubble area ratio) was determined by the same method as Sample 4. The bubble area ratio of Sample 6 was 1.9 times.

[0344] (Sample 7)

[0345] A cosmetic laminate was prepared in the same manner as Sample 4 except that a gel artificial nail prepared by mixing 20% ​​by mass of butyl methacrylate and 80% by mass of PRESTOTOPGEL manufactured by Nail Labo Corporation was used as the cover coat. The cover coat had an ultraviolet light transmittance of 87% at a wavelength of 340 nm, an elastic modulus of 329 MPa, and a N2 gas transmittance of 84 cc / m 2 ·24hr·atm. The bonding strength between the cosmetic layer and the cover coating is 20N / cm 2 The gas permeability of the coating layer was measured by a method based on a differential pressure method (JIS K7126-1) and an isobaric method (JIS K7126-2).

[0346] The covering coating covers the entire surface of the cosmetic layer and has an open porosity of less than 1%.

[0347] The ratio of the bubble area of ​​sample 7 with the coating to the bubble area of ​​sample 25 without the coating (ie, the bubble area ratio) was determined by the same method as sample 4. The bubble area ratio of sample 7 was 3.5 times.

[0348] (Sample 8)

[0349] A cosmetic laminate was prepared in the same manner as Sample 4 except that a gel artificial nail prepared by mixing 20% ​​by mass of polyethylene glycol monomethyl ether methacrylate and 80% by mass of PRESTOSOFTTOPGEL manufactured by Nail Labo Corporation was used as the cover coat. The cover coat had an ultraviolet light transmittance of 86% at a wavelength of 340 nm and an elastic modulus of 6.6 MPa. The bonding strength between the cosmetic layer and the cover coat was 20 N / cm 2 above.

[0350] The covering coating covers the entire surface of the cosmetic layer and has an open porosity of less than 1%.

[0351] The ratio of the bubble area of ​​Sample 8 with the coating to the bubble area of ​​Sample 25 without the coating (ie, the bubble area ratio) was determined by the same method as Sample 4. The bubble area ratio of Sample 8 was 1.8 times.

[0352] (Sample 9)

[0353] The cosmetic layer was prepared in the same manner as Sample 4 except that Paragel ClearGel manufactured by NAIL SELECT Co., Ltd. was used as the cover coat. The cover coat had an ultraviolet light transmittance of 35% at a wavelength of 340 nm and an elastic modulus of 953 MPa. The bonding strength between the cosmetic layer and the cover coat was 20 N / cm 2 above.

[0354] The covering coating covers the entire surface of the cosmetic layer and has an open porosity of less than 1%.

[0355] The ratio of the bubble area of ​​sample 9 with the coating to the bubble area of ​​sample 25 without the coating (ie, the bubble area ratio) was determined by the same method as sample 4. The bubble area ratio of sample 9 was 1.2 times.

[0356] (Sample 10)

[0357] A cosmetic laminate was prepared in the same manner as Sample 4 except that PRESTO SOFT TOPGEL manufactured by Nail Labo Corporation was used as the cover coat. The cover coat had an ultraviolet light transmittance of 82% at a wavelength of 340 nm and an elastic modulus of 89 MPa. The bonding strength between the cosmetic layer and the cover coat was 20 N / cm 2 The bonding strength between the cosmetic layer and the covering coating is 20N / cm 2 above.

[0358] The covering coating covers the entire surface of the cosmetic layer and has an open porosity of less than 1%.

[0359] The ratio of the bubble area of ​​sample 10 with the coating to the bubble area of ​​sample 25 without the coating (ie, the bubble area ratio) was determined by the same method as sample 4. The bubble area ratio of sample 10 was 1.7 times.

[0360] (Sample 11)

[0361] A cosmetic laminate was prepared in the same manner as Sample 6 except that a polyethylene membrane filter (GVS, Polyester Track Etched Membrane Disk, porosity 16%) was used as the cover coat. The cover coat had a UV transmittance of 65% at a wavelength of 340 nm, an elastic modulus of 1703 MPa, and a N2 gas transmittance of 8.2×10 7 cc / m 2 ·24hr·atm. In addition, the bonding strength between the cosmetic layer and the cover coating is 0.6N / cm 2The gas permeability of the coating layer was measured by an isobaric method (JIS K7126-2).

[0362] The ratio of the bubble area of ​​sample 11 with the coating to the bubble area of ​​sample 25 without the coating (ie, the bubble area ratio) was determined by the same method as sample 4. The bubble area ratio of sample 11 was 3.1 times.

[0363] (Sample 12)

[0364] The cosmetic laminate was prepared in the same manner as Sample 6 except that a polyethylene terephthalate film (manufactured by TORAY INDUSTRIES, INC., Lumirror S10) was used as the cover coat. The UV transmittance of the cover coat at a wavelength of 340 nm was 71%, and the elastic modulus was 2478 MPa. In addition, the bonding strength between the cosmetic layer and the cover coat was 0.9 N / cm 2 .

[0365] The covering coating covers the entire surface of the cosmetic layer and has an open porosity of less than 1%.

[0366] The ratio of the bubble area of ​​sample 12 with the coating to the bubble area of ​​sample 25 without the coating (ie, bubble area ratio) was determined by the same method as sample 4. The bubble area ratio of sample 12 was 3.2 times.

[0367] (Sample 13)

[0368] A glycidyl azide polymer was added to a gel artificial nail obtained by mixing 99% by mass of a urethane methacrylate polymer (manufactured by Kyoeisha Chemical Co., Ltd.) and 1% by mass of diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide so that the solid content concentration was 10% by mass, and the mixture was mixed thoroughly to prepare a cosmetic resin composition. In this way, a cosmetic laminate was prepared in the same manner as Sample 5 except that the cosmetic resin composition was different. The density of the glycidyl azide polymer was 1.3 g / cm 3 The density of gel artificial nails is about 1.1g / cm 3 , therefore, the volume ratio of 10% by weight of the glycidyl azide polymer is 8.6% by mass.

[0369] The bonding strength between the cosmetic layer and the cover coating is 20N / cm 2 above.

[0370] The covering coating covers the entire surface of the cosmetic layer and has an open porosity of less than 1%.

[0371] The ratio of the bubble area of ​​sample 13 with the coating to the bubble area of ​​sample 25 without the coating (ie, bubble area ratio) was determined by the same method as sample 4. The bubble area ratio of sample 13 was 1.6 times.

[0372] Fig.10 This is a graph showing the ratio of the bubble area of ​​Samples 4, 5, 6, 7, 9, 11, and 12 to the case of Sample 25 without a coating layer relative to the ultraviolet light transmittance at a wavelength of 340 nm. Samples 4, 5, 6, 7, 9, 11, and 12 are samples having an elastic modulus greater than 100 MPa among Samples 4 to 10 of the cosmetic resin composition having a solid content concentration of 20% by mass of a glycidyl azide polymer. In a coating layer having an elastic modulus of 100 MPa or more and being somewhat hard, it can be confirmed that the higher the ultraviolet light transmittance, the more bubbles tend to diffuse.

[0373] Fig.11 It is a graph showing the bubble area ratio of samples 4, 5, 7, 8, 10, 11, and 12 relative to the case of sample 25 without a coating layer relative to the elastic modulus. Samples 4, 5, 7, 8, 10, 11, and 12 are samples in which the ultraviolet light transmittance at a wavelength of 340 nm is higher than 50% in samples 4 to 10 of the cosmetic resin composition using a glycidyl azide polymer having a solid content concentration of 20% by mass. If the elastic modulus of the coating layer is high (i.e., the coating layer is hard), the tendency of bubble diffusion can be confirmed. As the main reason for this, it is believed that when the elastic modulus of the coating layer is low (i.e., soft), when gas (e.g., N2) is generated by ultraviolet light irradiation, the cosmetic layer causes deformation such as expansion in the opposite direction to the organism like a balloon, and the gas is difficult to diffuse in the surface direction. On the other hand, it is speculated that when the elastic modulus of the coating layer is high (i.e., the coating layer is hard), the gas diffuses efficiently in the surface direction.

[0374] [Evaluation of Adhesion to Nails]

[0375] (Sample 14)

[0376] The cosmetic resin composition made by the same method as sample 7 is applied to the entire surface of the nail of the hand of the person with a brush for artificial nails, and a coating film of the cosmetic resin composition is formed on the nail. The coating film is cured by the same method as sample 7. Thus, a cosmetic layer formed by the cosmetic resin composition is produced. Furthermore, the covering coating used in sample 7 is set on the cosmetic layer and cured, thereby bonding the cosmetic laminate to the nail. After curing, wipe the surface with ethanol and then directly carry out normal life. It was confirmed that the cosmetic laminate did not peel off from the nail for more than 24 hours.

[0377] In addition, a cosmetic resin composition was applied on a glass slide by gap coating, cured in the same manner as sample 7, and then the surface was wiped with ethanol to prepare a thin film. The contact angle of water on the surface of the film was evaluated. The contact angle was measured by the drop method using DROPMASTER DMO-501 manufactured by Kyowa Interface Science Co., Ltd. The contact angle was evaluated by dropping 5 μL of water. The analysis was performed by the θ / 2 method. The contact angle was measured 5 times and the average value was obtained. The contact angle of water on the surface of the film, that is, the surface of the cured product of the cosmetic resin composition, was 66.8°.

[0378] (Sample 15)

[0379] The cosmetic resin composition prepared by the same method as sample 13 is applied to the entire surface of the nail of the human hand with a brush for artificial nails to form a coating film of the cosmetic resin composition on the nail. The coating film is cured by the same method as sample 13. Thus, a cosmetic layer formed by the cosmetic resin composition is prepared. Furthermore, the covering coating used in sample 13 is set on the cosmetic layer and cured, thereby bonding the cosmetic laminate to the nail. After curing, wipe the surface with ethanol and then directly carry out normal life. It was confirmed that the cosmetic laminate did not peel off from the nail for more than 24 hours.

[0380] In addition, a thin film sheet was prepared by applying the cosmetic resin composition on a slide glass by gap coating, curing it in the same manner as Sample 13, and then wiping the surface with ethanol. The contact angle of water on the surface of the thin film sheet was evaluated in the same manner as Sample 14. The contact angle of water on the surface of the thin film sheet, that is, the surface of the cured product of the cosmetic resin composition, was 71.6°.

[0381] (Sample 16)

[0382] A cosmetic resin composition was obtained in the same manner as Sample 1 except that "INTEGRATE TOP & BASECOAT" (Shiseido Co., Ltd.), which is a commercially available artificial nail, was used and the glycidyl azide polymer was added so that the solid content concentration was 51.7% by mass. The fact that INTEGRATE TOP & BASECOAT and the glycidyl azide polymer were fully mixed with each other and became uniform was confirmed by making the light transmission state uniform in the obtained cosmetic resin composition. The main material of INTEGRATE TOP & BASECOAT is an acrylic resin, which generally has a density of 1.2 g / cm 3 Therefore, the volume ratio of the glycidyl azide polymer is 49.7 volume %.

[0383] The prepared cosmetic resin composition is applied to the entire surface of the nail of a person's hand with a brush for artificial nails to form a coating film of the cosmetic resin composition on the nail. By allowing the coating film to dry naturally, a cosmetic layer formed by the cosmetic resin composition is produced. Furthermore, the covering coating used in sample 7 is applied on the cosmetic layer, and a lamp for curing gel artificial nails is used to irradiate the LED output light with a wavelength of 390nm to 400nm for 2 minutes to cure the cosmetic resin composition on the nail, thereby bonding the cosmetic laminate to the nail. After curing, wipe the surface with ethanol and then carry out normal life directly. It was confirmed that the cosmetic laminate did not peel off from the nail for more than 24 hours.

[0384] In addition, a thin film sheet was prepared by applying the cosmetic resin composition on a slide glass by gap coating, allowing it to dry naturally, and then wiping the surface with ethanol. The contact angle of water on the surface of the thin film sheet was evaluated in the same manner as Sample 14. The contact angle of water on the surface of the thin film sheet, that is, the surface of the cured product of the cosmetic resin composition, was 100.5°.

[0385] (Sample 17)

[0386] A gel artificial nail prepared by mixing 79.0 mass % of a urethane methacrylate polymer, 20.0 mass % of a quaternary ammonium salt acrylic polymer, and 1.0 mass % of diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide was used, and a glycidyl azide polymer was added so as to have a solid content concentration of 0.65 mass %. The same operation as in Sample 1 was performed to obtain a cosmetic resin composition. The gel artificial nail and the glycidyl azide polymer were fully mixed and uniformly mixed with each other, and the light transmission state was uniform in the obtained cosmetic resin composition. The density of the prepared gel artificial nail was 1.0 g / cm 3 , therefore, the volume ratio of the glycidyl azide polymer was 0.5 volume %.

[0387] Using the prepared cosmetic resin composition, apply it to the entire surface of the nail of a person's hand with a brush for artificial nails, and set the cosmetic resin composition on the nail. The cosmetic resin composition on the nail is irradiated with LED output light with a wavelength of 390nm to 400nm for 2 minutes using light for curing gel artificial nails, thereby curing the cosmetic resin composition on the nail. Furthermore, the covering coating used in sample 7 is applied on the cosmetic layer and cured by the same method as the cosmetic resin composition, thereby bonding the cosmetic laminate to the nail. After curing, wipe the surface with ethanol and then carry out normal life directly. It was confirmed that the coated cosmetic laminate did not peel off from the nail for more than 24 hours.

[0388] Furthermore, the contact angle of water on the surface of the cured product of the resin composition for cosmetics of this example was measured in the same manner as in Sample 14. The contact angle of water was 39.6°.

[0389] (Sample 26)

[0390] A resin composition for cosmetics was obtained in the same manner as in Sample 1 except that a polyvinyl alcohol adhesive was used and a glycidyl azide polymer was added so as to be 0.54% by mass in terms of solid content concentration and the mixture was thoroughly mixed. The resin composition for cosmetics of Sample 26 was applied to the entire surface of a nail of a human hand using a brush for artificial nails, and the resin composition for cosmetics was provided on the nail. The resin composition for cosmetics on the nail was fully dried and cured at room temperature, and a film as a cured product of the resin composition for cosmetics was formed on the nail. Then, the normal life was carried out as it was, and the film was peeled off from the nail within 1 hour.

[0391] In addition, the contact angle of water on the surface of the cured product of the cosmetic resin composition of Sample 26 was measured by the same method as that of Sample 14. The contact angle of water was 26.8°.

[0392] (Sample 27)

[0393] A cosmetic resin composition was obtained in the same manner as Sample 1 except that a silicone adhesive was used and a glycidyl azide polymer was added so as to be 0.65% by mass in terms of solid content concentration and the mixture was thoroughly mixed. The cosmetic resin composition of Sample 27 was applied to the entire surface of a nail of a human hand using a brush for artificial nails, and the cosmetic resin composition was provided on the nail. The cosmetic resin composition on the nail was fully dried and cured at room temperature, and a film as a cured product of the cosmetic resin composition was formed on the nail. Then, the normal life was carried out as it was, and the film peeled off from the nail within 1 hour.

[0394] In addition, the contact angle of water on the surface of the cured product of the cosmetic resin composition of Sample 27 was measured by the same method as that of Sample 14. The contact angle of water was 110.6°.

[0395] As an evaluation of the adhesiveness of the nail, after setting the cured product of the cosmetic resin composition on the nail, the nail was used for normal life, and the case of peeling within 1 hour was set as ×, the case of peeling within 1 to 24 hours was set as △, and the case of not peeling for more than 24 hours was set as 0. In addition, after setting the cosmetic resin composition on the nail, it was rubbed 100 times with a cotton swab to evaluate the number of times the cured product of the cosmetic resin composition peeled from the nail. The case of peeling within 10 times was set as ×, the case of peeling 10 to 100 times was set as △, and the case of not peeling even if rubbed 100 times was set as 0. The results of Sample 14, Sample 15, Sample 16, Sample 17, Sample 26 and Sample 27 are shown in Table 1 below.

[0396] [Table 1]

[0397]

[0398] As shown in Table 1, the cosmetic resin compositions of Samples 14, 15, 16, and 17 having a water contact angle in the range of 30° to 110° exhibited higher adhesion to nails than the cosmetic resin compositions of Samples 26 and 27 having a water contact angle outside the range of 30° to 110°.

[0399] [Evaluation of peeling time from nails]

[0400] (Sample 18)

[0401] A cosmetic resin composition was prepared by the same method as sample 7 except that the glycidyl azide polymer was 30% by mass, and the cosmetic resin composition was applied to the entire surface of a nail of a human hand using a brush for artificial nails to form a coating film of the cosmetic resin composition on the nail. The coating film was cured by the same method as sample 7 to form a cosmetic layer. Furthermore, the covering coating used in sample 7 was set on the cosmetic layer and cured. After curing, the surface was wiped with ethanol to produce a cosmetic laminate. The adhesion between the cosmetic layer and the covering coating was 20N / cm 2 above.

[0402] The density of glycidyl azide polymer is 1.3 g / cm 3 The commercially available base gel artificial nail used has a density of about 1.1 g / cm 3 , therefore, the volume ratio of the 30% by weight glycidyl azide polymer in the cosmetic resin composition is 26.6% by volume.

[0403] Then, the subjects continued their normal life for more than 6 hours, and it was confirmed that the cosmetic laminated material did not peel off from the nail.

[0404] Then, the cosmetic layer on the nail was treated with 15 J / cm 2 Irradiation with ultraviolet light. For irradiation with ultraviolet light, an LED lamp (manufactured by DOWA) with a central peak at a wavelength of 340 nm was used. The intensity of ultraviolet light was measured using a UV LIGHT METER (manufactured by CUSTOM CORPORATION, UV-37SD), and the irradiation time was adjusted so that the irradiation amount of ultraviolet light was 15 J / cm 2 It was confirmed that bubbles were generated in the cosmetic layer after ultraviolet light irradiation. The cosmetic laminate was peeled off using nail pliers and tweezers, and it was confirmed that it could be easily peeled off from the nail even without using an organic solvent such as acetone. The time for peeling the cosmetic laminate from the nail was 20 seconds.

[0405] (Sample 19)

[0406] The cosmetic resin composition prepared by the same method as Sample 18 was applied to the entire surface of the nail of a human hand using a brush for artificial nails to form a coating film of the cosmetic resin composition on the nail. The coating film was cured by the same method as Sample 18 to form a cosmetic layer. Furthermore, the cover coating used in Sample 18 was provided on the cosmetic layer and cured to prepare a cosmetic laminate.

[0407] On the cover coat, a color gel artificial nail (PREGEL COLOREXS903 manufactured by PREANFACO., LTD.) was applied to the entire surface of the nail and cured. Then, a top gel artificial nail (PRESTO TOPGEL manufactured by Nail Labo Corporation.) was applied to the entire surface of the nail and cured. The color gel artificial nail and the top gel artificial nail were cured in the same manner as in Sample 1. After the top gel artificial nail was cured, the surface of the cosmetic laminate was wiped with ethanol. The cosmetic laminate was confirmed to not peel off from the nail during normal life for more than 6 hours.

[0408] Then, the top gel artificial nail and the color gel artificial nail are removed by grinding. The removal is performed until the color of the color layer disappears and becomes transparent in more than 90% of the area. After this removal process, a cosmetic layered product with a slightly ground surface is provided on the nail.

[0409] At 15J / cm 2The cosmetic laminate on the nail (i.e., the cosmetic laminate with a slightly polished surface) was irradiated with ultraviolet light. For irradiation with ultraviolet light, an LED lamp (manufactured by DOWA) with a central peak at a wavelength of 340 nm was used. The intensity of ultraviolet light was measured using a UV LIGHT METER (manufactured by CUSTOM CORPORATION, UV-37SD), and the irradiation time was adjusted so that the irradiation amount of ultraviolet light was 15 J / cm 2 It was confirmed that bubbles were generated in the cosmetic layer after ultraviolet light irradiation. The cosmetic laminate was peeled off using nail pliers and tweezers, and it was confirmed that it could be easily peeled off from the nail even without using an organic solvent such as acetone. The time for peeling the cosmetic laminate from the nail was 14 seconds.

[0410] (Sample 20)

[0411] The cosmetic resin composition prepared by the same method as sample 18 was applied to the entire surface of the nail of the human hand with a brush for artificial nails to form a coating film of the cosmetic resin composition on the nail. The coating film was cured by the same method as sample 18 to form a cosmetic layer. Then, on the cosmetic layer, a color gel artificial nail (PREANFA CO., LTD., PREGELCOLOREX S903) was applied to the entire surface of the nail and cured, and then a top coat (Nail Labo Corporation., TOPGEL) was applied to the entire surface of the nail and cured. The curing of the color gel artificial nail and the top gel artificial nail was implemented in the same way as sample 1, and the surface of the top gel artificial nail was wiped with ethanol after curing. After more than 6 hours of normal life, it was confirmed that the laminate of the cosmetic layer, the color gel artificial nail and the top gel artificial nail did not peel off from the nail.

[0412] Then, the top gel artificial nail and the color gel artificial nail were removed by grinding. The removal was carried out until the color of the color layer disappeared and became transparent in more than 90% of the area. After this removal process, the cosmetic layer was roughly exposed on the nail. The surface of the exposed cosmetic layer was slightly ground. On such a cosmetic layer, a covering coating similar to Sample 7 was made by the same method as Sample 7. The bonding strength between the cosmetic layer and the covering coating was 20N / cm 2 above.

[0413] The covering coating covers the entire surface of the cosmetic layer and has an open porosity of less than 1%.

[0414] At this time, a cosmetic layered product composed of the cosmetic layer and the cover coat layer is formed on the nail.

[0415] 15J / cm2 for cosmetic layers on nails 2Irradiation with ultraviolet light. For irradiation with ultraviolet light, an LED lamp (manufactured by DOWA) with a central peak at a wavelength of 340 nm was used. The intensity of ultraviolet light was measured using a UV LIGHT METER (manufactured by CUSTOM CORPORATION, UV-37SD), and the irradiation time was adjusted so that the irradiation amount of ultraviolet light was 15 J / cm 2 It was confirmed that bubbles were generated in the cosmetic layer after ultraviolet light irradiation. The cosmetic laminate was peeled off using nail pliers and tweezers, and it was confirmed that it could be easily peeled off from the nail without using an organic solvent such as acetone. The time for peeling the cosmetic laminate from the nail was 25 seconds.

[0416] (Sample 28)

[0417] The cosmetic resin composition prepared by the same method as Sample 18 was applied to the entire surface of the nail of a human hand using a brush for artificial nails to form a coating film of the cosmetic resin composition on the nail. The coating film was cured by the same method as Sample 18 to form a cosmetic layer. The surface of the cosmetic layer was wiped with ethanol. No cover coating was provided.

[0418] 15J / cm2 for the cosmetic layer on the nails 2 Irradiation with ultraviolet light. For irradiation with ultraviolet light, an LED lamp (manufactured by DOWA) with a central peak at a wavelength of 340 nm was used. The intensity of ultraviolet light was measured using a UV LIGHT METER (manufactured by CUSTOM CORPORATION, UV-37SD), and the irradiation time was adjusted so that the irradiation amount of ultraviolet light was 15 J / cm 2 It was confirmed that bubbles were generated to a certain extent in the cosmetic layer after ultraviolet light irradiation. The cosmetic layer was peeled off using nail pliers and tweezers. It was confirmed that the cosmetic layer could be peeled off from the nail even without using organic solvents such as acetone, but it took more than 300 seconds to peel off the cosmetic layer from the nail.

[0419] (Sample 29)

[0420] The gel artificial nail base used in Sample 21 was applied to the entire surface of a human nail using an artificial nail brush, and the applied film was cured in the same manner as Sample 21 to prepare a cosmetic layer composed of the gel artificial nail base on the nail. The surface of the cosmetic layer was wiped with ethanol.

[0421] Then, the cosmetic layer on the nail was irradiated with ultraviolet light in the same manner as Sample 18. No bubbles were observed in the cosmetic layer after ultraviolet light irradiation, and the gel artificial nail as the cosmetic layer could not be peeled off from the nail without swelling by organic materials such as acetone.

[0422] Table 2 shows the results of the peelability of the cosmetic laminates or cosmetic layers after ultraviolet irradiation of Samples 18, 19, 20, 28, and 29. After ultraviolet irradiation, the case where the cosmetic laminates or cosmetic layers could be peeled off within 300 seconds without an organic solvent such as acetone was indicated by 0, the case where the cosmetic laminates or cosmetic layers could be peeled off without an organic solvent such as acetone but took more than 300 seconds was indicated by △, and the case where the cosmetic laminates or cosmetic layers could not be peeled off without an organic solvent such as acetone was indicated by ×.

[0423] According to Table 2, in samples 18, 19, and 20 provided with a cover coating, the cosmetic laminate can be easily peeled off from the nail in a relatively fast time of less than 30 seconds without using an organic solvent such as acetone. On the other hand, for sample 28 having a cosmetic layer formed of a cosmetic resin composition containing a stimuli-responsive material but not provided with a cover coating, although the cosmetic layer can be peeled off without an organic solvent, it takes more than 300 seconds. In addition, for sample 29 having a cosmetic layer formed of a composition not containing a stimuli-responsive material and not provided with a cover coating, it cannot be peeled off without an organic solvent.

[0424] [Table 2]

[0425]

[0426] Industrial Applicability

[0427] The cosmetic resin composition of the present disclosure can be used, for example, as a base coat of an artificial nail, etc. In addition, the cosmetic resin composition of the present disclosure can also be used as an adhesive for eyelash extensions and an adhesive for hair, etc.

[0428] Description of Reference Numerals

[0429] 1 Organism

[0430] 2. Nails

[0431] 100 Cosmetic Laminates

[0432] 101 Cosmetic Layer

[0433] 102, 103 Covering coating

[0434] 200 Color Artificial Nails

[0435] 300 Top Artificial Nails

Claims

1. A cosmetic laminate comprising: A cosmetic layer bonded to a part of a living body, and Covering coating, The cosmetic layer and the covering coating are arranged such that the cosmetic layer is located between the living body and the covering coating when the cosmetic layered product is bonded to the living body. The cosmetic layer comprises a cosmetic resin composition containing a stimuli-responsive material, and is bonded to a part of the living body via a cured product of the cosmetic resin composition, wherein the stimuli-responsive material changes in volume in response to an external stimulus, The external stimulus excludes the external stimulus caused by contact with a solvent and the external stimulus caused by contact with a solution, The contact angle of water on the surface of the cured product of the cosmetic resin composition is 30° or more and 110° or less, The adhesive strength of the cosmetic layer to the part of the living body is reduced due to a volume change of the cured product of the cosmetic resin composition caused by applying the external stimulus to the cured product. The covering coating has an open porosity of 40% or less.

2. The cosmetic laminate according to claim 1, wherein: The cured product of the cosmetic resin composition undergoes a volume change due to the generation of gas by applying the external stimulus, The covering coating has a 1.5×10 8 cc / m 2 Gas permeability below 24hr·atm.

3. A cosmetic laminate comprising: A cosmetic layer bonded to a part of a living body, and Covering coating, The cosmetic layer and the covering coating are arranged such that the cosmetic layer is located between the living body and the covering coating when the cosmetic layered product is bonded to the living body. The cosmetic layer comprises a cosmetic resin composition containing a stimuli-responsive material, and is bonded to a part of the living body via a cured product of the cosmetic resin composition, wherein the stimuli-responsive material changes in volume by generating gas in response to an external stimulus, wherein: The external stimulus excludes the external stimulus caused by contact with a solvent and the external stimulus caused by contact with a solution, The adhesive strength of the cosmetic layer to the part of the living body is reduced due to a volume change of the cured product of the cosmetic resin composition caused by applying the external stimulus to the cured product. The covering coating has a 1.5×10 8 cc / m 2 Gas permeability below 24hr·atm.

4. The cosmetic laminate according to claim 3, wherein: A contact angle of water on the surface of the cured product of the cosmetic resin composition is 30° or more and 110° or less.

5. The cosmetic laminate according to claim 1 or 3, wherein: The cover coating has a tensile modulus of 5 MPa or more.

6. The cosmetic laminate according to claim 1 or 3, wherein: The bonding strength between the cosmetic layer and the covering coating is 0.05 N / cm 2 above.

7. The cosmetic laminate according to claim 1 or 3, wherein: The external stimulus is at least one selected from the group consisting of light, heat, magnetism, electricity and external force.

8. The cosmetic laminate according to claim 7, wherein: The external stimulus is light having a wavelength in the range of 280 nm or more and less than 400 nm.

9. The cosmetic laminate according to claim 8, wherein: The cover coating has a transmittance of 10% or more with respect to light of any wavelength within a range of 280 nm to less than 400 nm.

10. The cosmetic laminate according to claim 1 or 3, wherein: The stimuli responsive material comprises an azide compound.

11. The cosmetic laminate according to claim 10, wherein: The stimuli responsive material comprises a glycidyl azide polymer.

12. The cosmetic laminate according to claim 11, wherein: The cosmetic resin composition contains a glycidyl azide polymer in a range of 0.5 mass % to 55 mass %.

13. The cosmetic laminate according to claim 1 or 3, wherein: The cosmetic layer and the cover coating are in contact with each other.

14. The cosmetic laminate according to claim 1 or 3, wherein: The cosmetic laminate is for artificial nails or eyelash extensions.

15. A covering coating covering at least a portion of a cosmetic layer that undergoes a volume change by external stimulation, wherein: The external stimulus excludes the external stimulus caused by contact with a solvent and the external stimulus caused by contact with a solution, The covering coating has an open porosity of 40% or less and a tensile modulus of 5 MPa or more. 16 . The cover coating according to claim 15 , which has a transmittance of 10% or more with respect to light of any wavelength within a range of 280 nm to less than 400 nm.

17. A method for manufacturing an artificial nail, comprising: Applying a resin composition for an artificial nail containing a stimuli-responsive material to a nail, curing the resin composition for an artificial nail, and forming a first artificial nail layer bonded to the nail, wherein the stimuli-responsive material changes in volume due to an external stimulus, wherein the external stimulus excludes an external stimulus caused by contact with a solvent and an external stimulus caused by contact with a solution; and A cover coating layer having an opening ratio of 40% or less is formed on the first artificial nail layer.

18. The method for manufacturing an artificial nail according to claim 17, further comprising forming a second artificial nail layer on the cover coat layer, The second artificial nail layer is a colored artificial nail or a top artificial nail.

19. A method for removing an artificial nail, which is a method for removing an artificial nail adhered to a nail, The artificial nail comprises a first artificial nail layer, wherein the first artificial nail layer is formed by curing a resin composition for an artificial nail containing a stimuli-responsive material, wherein the stimuli-responsive material changes in volume due to an external stimulus, wherein The external stimulus excludes the external stimulus caused by contact with a solvent and the external stimulus caused by contact with a solution, The method comprises: forming a covering coating layer having an opening rate of 40% or less on the surface of the exposed first artificial nail layer; and The external stimulus is applied to the first artificial nail layer, and the first artificial nail layer and the cover coat layer are removed from the nail.

20. The method for removing artificial nails according to claim 19, wherein: The artificial nail further comprises at least one other artificial nail layer stacked on the first artificial nail layer, The method further includes removing at least a portion of the other artificial nail layer to expose at least a portion of the surface of the first artificial nail layer before forming the cover coating layer.

21. A method for removing an artificial nail, which is a method for removing an artificial nail adhered to a nail, The artificial nail comprises a first artificial nail layer and a cover coating layer disposed on the first artificial nail layer and having an opening rate of 40% or less, wherein the first artificial nail layer is formed by curing a resin composition for artificial nails containing a stimuli-responsive material, wherein the stimuli-responsive material causes a volume change by an external stimulus, wherein: The external stimulus excludes the external stimulus caused by contact with a solvent and the external stimulus caused by contact with a solution, The method includes applying the external stimulus to the first artificial nail layer, and removing the first artificial nail layer and the cover coat layer from the nail.

22. The method for removing artificial nails according to claim 21, wherein: The artificial nail further comprises at least one other artificial nail layer stacked on the first artificial nail layer and the cover coat layer, The method further includes removing at least a portion of the other artificial nail layers other than the first artificial nail layer and the cover coat layer before applying the external stimulus to the first artificial nail layer.

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