Release agent and method for releasing gel nails after treatment using release agent

Abstract

The purpose of the present invention is to provide a release agent capable of achieving a removal property (releasability) in a short time with respect to gel nails treated therewith without using aluminum foil or cotton for preventing volatilization of solvents.　The present invention provides a release agent comprising components (A) through (D).　Component (A): a carbonate-based solvent Component (B): a polyether-based solvent that does not contain a hydroxyl group in the molecule Component (C): an unsaturated fatty acid as an oil Component (D): a thickener

Description

Remover and method for removing gel nails after application using the same

[0001] The present invention relates to a remover and a method for removing gel nails after application using the same.

[0002] So-called gel nails are created by applying a photocurable composition directly or indirectly to a human nail and curing it with light irradiation, resulting in a nail cosmetic film with high adhesion and a beautiful luster. The photocurable composition used in gel nails typically employs a photocurable (meth)acrylate resin composition. After application, gel nails deteriorate through daily use, such as peeling and partial loss, so they are periodically redone to maintain their aesthetic appearance. To do this, old gel nails must be removed. Known methods for removing gel nails include applying solvent-impregnated cotton to the nail and covering it with aluminum foil to swell the gel nail with the solvent and facilitate removal. However, this method also results in continued contact of the solvent with the skin. Japanese Patent Application Laid-Open No. 2014-200468 describes a gel nail removal sheet in which a gel containing acetone as a solvent is formed on a substrate sheet and then cut into the shape of a nail.

[0003] However, even when the technology described in JP 2014-200468 A is used, it has been found that sufficient peeling properties cannot be obtained by simply soaking the gel agent in acetone, and that a long time or multiple peeling operations are required to achieve peeling.

[0004] Therefore, in the past, it was difficult to achieve quick removal (peelability) of applied gel nails without using aluminum foil or cotton to suppress the evaporation of the solvent.

[0005] Therefore, the present invention aims to provide a remover that can remove (peel) applied gel nails in a short time without using aluminum foil or cotton to suppress solvent evaporation.

[0006] As a result of intensive research to achieve the above object, the inventors discovered a means for removing applied gel nails that can solve the above problems, and thus completed the present invention.

[0007] The gist of the present invention is explained below. A first aspect of the present invention is a release agent comprising the following components (A) to (D): Component (A): a carbonate-based solvent, Component (B): a polyether-based solvent not containing a hydroxyl group in the molecule, Component (C): an unsaturated fatty acid as an oil, and Component (D): a thickener.

[0008] A second aspect of the present invention is the release agent according to the first aspect, wherein the ratio of the content of the component (A) to the total content of the components (A) to (C) is less than 50 mass %, and the ratio of the content of oils other than the component (C) to the total content of the components (A) to (C) is less than 15 mass %.

[0009] A third aspect of the present invention is the stripping agent according to the first or second aspect, which does not contain an alcohol-based solvent having 1 to 6 carbon atoms in the molecule.

[0010] A fourth aspect of the present invention is the stripping agent according to any one of the first to third aspects, wherein the component (B) is one or more selected from the group consisting of dimethoxymethane, 1,2-diethoxyethane, and diethylene glycol dimethyl ether.

[0011] A fifth aspect of the present invention is the stripping agent according to any one of the first to fourth aspects, wherein the unsaturated fatty acid of component (C) is an unsaturated fatty acid having 10 to 25 carbon atoms per molecule.

[0012] A sixth aspect of the present invention is the stripping agent according to any one of the first to fifth aspects, wherein the component (D) is hydrophobically treated fumed silica powder and / or hydroxypropyl cellulose.

[0013] A seventh aspect of the present invention is a method for removing gel nails after application, which comprises applying a remover described in any of the first to sixth aspects to the gel nail after application, and which does not use either a sheet that suppresses solvent evaporation or a material that is impregnated with the solvent.

[0014] An eighth aspect of the present invention is a method for removing gel nails after application, which comprises applying the remover according to any one of the first to sixth aspects to the applied gel nail and then leaving it for a specific period of time to remove the gel nail.

[0015] The remover of the present invention is used as a remover for gel nails, and enables applied gel nails to exhibit removability in a short period of time without using aluminum foil or cotton to suppress the evaporation of the solvent.

[0016] One aspect of the present invention is a release agent comprising the following components (A) to (D): component (A): a carbonate-based solvent; component (B): a polyether-based solvent not containing a hydroxyl group in the molecule; component (C): an unsaturated fatty acid as an oil; and component (D): a thickener.

[0017] The details of the present invention will now be described.

[0018] <Component (A): Carbonate-Based Solvent> Component (A) that can be used in the present invention is a carbonate-based solvent. Specific examples of component (A) include, but are not limited to, dialkyl carbonates such as dimethyl carbonate, ethyl methyl carbonate, and diethyl carbonate, diphenyl carbonate, ethylene carbonate, propylene carbonate, and butylene carbonate. Component (A) may be used alone or in combination. Because of its low volatility, component (A) remains on the surface of the gel nail after application. Therefore, the boiling point of component (A) at 1 atmosphere is preferably 150 to 350°C, more preferably 200 to 350°C, and most preferably 200 to 300°C. When multiple components (A) are combined, the boiling point refers to the boiling point of the combined components. When used in combination with component (B), component (A) has the effect of swelling the gel nail after application and peeling it from the natural nail.

[0019] To avoid separation in appearance, the release agent of this embodiment preferably has a content of component (A) relative to the total content of component (A), the component (B) described below, and the component (C) described below, of less than 50% by mass. This percentage is more preferably 45% by mass or less. From the viewpoint of improving releasability, the release agent of this embodiment preferably has a content of component (A) relative to the total content of component (A), the component (B) described below, and the component (C) described below of 10% by mass or more, more preferably 20% by mass or more, and even more preferably 25% by mass or more. When the release agent contains two or more types of component (A), the content of component (A) refers to the total amount of these. Similarly, when the release agent contains two or more types of component (B) and / or component (C), the content of component (B) and / or component (C) refers to the total amount of these, respectively.

[0020] <Component (B): Polyether-Based Solvent Containing No Hydroxyl Groups in the Molecule> The component (B) that can be used in the present invention is a polyether-based solvent containing no hydroxyl groups in the molecule. Specific examples include dimethoxymethane, 1,2-diethoxyethane, diethylene glycol dimethyl ether, and diethylene glycol dibutyl ether. Of these, one or more selected from the group consisting of dimethoxymethane, 1,2-diethoxyethane, and diethylene glycol dimethyl ether are preferred. In particular, when the molecular weight of component (B) is 300 or less, the effect of component (B) in swelling the gel nail after application is more excellent. The lower limit of the molecular weight of component (B) is not particularly limited, but is, for example, 76 or more. Component (B) may be used alone or in combination. Note that component (B) does not include component (A) described above.

[0021] From the viewpoint of releasability, the content of component (B) in the release agent is preferably 50 to 150 parts by mass, more preferably 70 to 150 parts by mass, even more preferably 90 to 140 parts by mass, and particularly preferably 100 to 134 parts by mass, per 100 parts by mass of component (A). Furthermore, in order to avoid separation in appearance, the content of component (B) relative to the total content of component (A), component (B), and component (C) described below is preferably 35 to 45% by mass.

[0022] <Component (C): Unsaturated Fatty Acid as Oil> Component (C) that can be used in the present invention is an unsaturated fatty acid as an oil. Here, oil refers to a hydrophobic chemical substance extracted from animals, plants, minerals, etc. that phase separates from water, and includes mixtures of multiple components. Specific examples of oils include, but are not limited to, almond oil, olive oil, sunflower oil, medium-chain fatty acid triglycerides, saturated fatty acids, and unsaturated fatty acids that are fluid at 25°C. Component (C) refers to oils that fall under the category of unsaturated fatty acids, and oils other than component (C) refer to all oils excluding component (C). In the release agent of this embodiment, the content of oils other than component (C) is preferably less than 15% by mass, more preferably less than 10% by mass (lower limit: 0% by mass), relative to the total content of components (A) to (C). Furthermore, the number of carbon atoms per molecule of the unsaturated fatty acid is preferably 10 to 25. Specific examples include, but are not limited to, oleic acid (18 carbon atoms), palmitoleic acid (16 carbon atoms), linoleic acid (18 carbon atoms), arachidonic acid (20 carbon atoms), α-linolenic acid (18 carbon atoms), eicosapentaenoic acid (EPA, 20 carbon atoms), and docosahexaenoic acid (DHA, 22 carbon atoms). Oleic acid and linoleic acid are preferred. Component (C) may be used alone or in combination. Component (C) has the effect of improving peelability.

[0023] From the viewpoint of releasability, the content of component (C) in the release agent is preferably 10 to 150 parts by mass, more preferably 20 to 120 parts by mass, and even more preferably 30 to 110 parts by mass, per 100 parts by mass of component (A). Furthermore, in order to avoid separation in appearance, the content of component (C) relative to the total content of components (A), (B), and (C) is preferably 10 to 40% by mass, more preferably 12 to 35% by mass.

[0024] <Component (D): Thickener> The component (D) that can be used in the present invention is a thickener. Use of component (D) allows for appropriate control of the flowability of the release agent. Examples of the thickener for component (D) include, but are not limited to, powdered fillers and organic thickeners that are solid at 25°C. As the powdered filler, fumed silica powder is preferred, and hydrophobically treated fumed silica powder is more preferred. Examples of hydrophobic treatments include, but are not limited to, hydrophobic treatments using alkylsilyl groups, dimethylsilyl groups, polydimethylsiloxane, and the like. The primary particle size of the hydrophobically treated fumed silica powder is not particularly limited, but is preferably 1 to 100 nm, and more preferably 10 to 20 nm. Here, the primary particle size refers to the average particle size, which is the arithmetic mean of particle sizes confirmed by observation with an electron microscope. Organic thickeners that are solid at 25°C impart viscosity when dissolved in a solvent, thereby improving the handleability of the release agent during application from the viewpoint of suppressing flowability. Examples of organic thickeners that are solid at 25°C include thermoplastic resins, polymers, and elastomers, and specifically, (meth)acrylic resins and / or celluloses are preferred. As the (meth)acrylic resin, a resin containing a structural unit derived from a (meth)acrylic acid ester is used, and examples thereof include polymethyl methacrylate (PMMA). Examples of celluloses include methyl cellulose, ethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropylmethyl cellulose, and carboxymethyl cellulose. Among these, as organic thickeners that are solid at 25°C, (meth)acrylic resins and / or hydroxypropyl cellulose are particularly preferred. The (D) component may be used alone or in combination.

[0025] The content of component (D) in the release agent of this embodiment is not particularly limited, but from the viewpoint of controlling flowability, it is preferably 1 to 30 parts by mass, and more preferably 5 to 27.5 parts by mass, per 100 parts by mass of component (A).

[0026] The release agent of the present invention may contain additives such as a pH adjuster, a solvent other than components (A) and (B), and a surfactant in appropriate amounts, as long as the additives do not impair the properties of the present invention. The addition of these additives can adjust the appearance, flowability, and release properties.

[0027] The pH adjuster is not particularly limited, but is preferably one that can make the pH of the stripping agent higher than 7. Specific examples of the pH adjuster include, but are not limited to, ammonia water with a solid content of 28 mass %, alkaline electrolyzed water, aqueous sodium hydroxide solution, and aqueous potassium hydroxide solution.

[0028] Examples of solvents other than component (A) and component (B) include, but are not limited to, ethylcyclohexane, cyclohexane, hexane, isohexane, methanol, ethanol, ethylene glycol, isopropyl alcohol, and acetone. To prevent the release agent from becoming non-uniform, it is preferable that the release agent does not contain an alcohol-based solvent having 1 to 6 carbon atoms in the molecule, such as methanol, ethanol, ethylene glycol, propylene glycol, 1,3-butylene glycol, n-propanol, isopropyl alcohol, sec-propanol, n-butanol, n-pentanol, or n-hexanol. It is most preferable that the release agent does not contain any solvents other than component (A) and component (B). It is particularly preferable that the release agent does not contain any organic solvents other than component (A) and component (B).

[0029] The surfactant has -SO ３ Na, -SO ３ NH ４ Examples of such surfactants include anionic surfactants having the formula (I), nonionic surfactants containing no ions in the molecule, cationic surfactants containing a quaternary ammonium salt in the molecule, and amphoteric surfactants containing both anions and cations in the molecule. In the present invention, nonionic surfactants are preferred as surfactants, and higher alcohol-based nonionic surfactants are more preferred. It is preferable to add 0.1 to 1.0 parts by mass of the surfactant per 100 parts by mass of component (A).

[0030] The remover of the present invention can be used on applied gel nails. In other words, one aspect of the present invention is the use of the remover of the present invention for removing applied gel nails. A commonly known method for removing applied gel nails involves using a solvent-suppressing sheet, such as aluminum foil, to suppress solvent evaporation, and extending the time for immersion in the solvent by using a solvent-impregnated material, such as cotton or a rag. However, this method also results in continued contact with the skin. The use of the remover of the present invention makes it possible to remove applied gel nails without using a solvent-suppressing sheet and / or a solvent-impregnated material. In other words, one aspect of the present invention is a method for removing applied gel nails, which includes applying the remover of the present invention to the applied gel nails, but does not use either a solvent-suppressing sheet or a solvent-impregnated material. Preferably, the method does not include a step of holding a solvent-impregnated material, such as cotton or tissue, on the nail with the gel nail after applying the remover to the applied gel nail. The solvent contained in the material is not limited to the solvent contained in the remover. Preferably, the method does not include a step of placing a sheet that suppresses solvent evaporation, such as aluminum foil, on the nail having the gel nail after applying the remover to the gel nail after the application. Preferably, the method does not include a step of placing a sheet that suppresses solvent evaporation, such as aluminum foil, on the material.

[0031] In this case, the remover according to the present invention can be applied to the gel nail after application and then left for a specific period of time to remove the gel nail. Here, the specific period refers to 5 minutes to 1 hour. The specific period is preferably 5 to 15 minutes. The remover may be applied once or multiple times.

[0032] The release agent according to the present invention can be applied directly from a container filled with the release agent or by taking it out with a dropper, a brush, a cotton swab or the like.

[0033] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples. Hereinafter, the release agent may also be simply referred to as a composition.

[0034] Examples 1 to 19, Comparative Examples 1 to 14 The following components were prepared to prepare compositions: Component (A): Carbonate-based solvent Propylene carbonate (boiling point: approximately 240°C) (reagent) Component (B): Polyether-based solvent not containing a hydroxyl group in the molecule Methylal (dimethoxymethane) (molecular weight: 76) (reagent) Diethylene glycol dimethyl ether (molecular weight: 134) (diglyme, manufactured by Sankyo Chemical Co., Ltd.) 1,2-diethoxyethane (molecular weight: 118) (reagent) Component (B'): Solvent other than component (B) Isopropyl alcohol (reagent) (hereinafter referred to as IPA) Component (C): Unsaturated fatty acid as oil Oleic acid (NAA (registered trademark)-34, manufactured by NOF Corporation) Linoleic acid (reagent) Component (C'): Oil other than component (C) Medium-chain fatty acid triglyceride (Panacete (registered trademark) 810 (manufactured by NOF Corporation) Component (D): thickener - fumed silica powder hydrophobically treated with alkylsilyl (primary particle diameter: 12 nm) (AEROSIL (registered trademark, the same applies hereinafter) R805 manufactured by Nippon Aerosil Co., Ltd.) - fumed silica powder hydrophobically treated with dimethylsilyl (primary particle diameter: 16 nm) (AEROSIL R972 manufactured by Nippon Aerosil Co., Ltd.) - fumed silica powder hydrophobically treated with polydimethylsiloxane (primary particle diameter: 12 nm) (CAB-O-SIL (registered trademark) TS-720 manufactured by Cabot Corporation) - hydroxypropyl cellulose (HPC-M manufactured by Nippon Soda Co., Ltd.) Other components: surfactant - higher alcohol-based nonionic surfactant (NAROACTY CL-40 manufactured by Sanyo Chemical Industries, Ltd.) Other components: pH adjuster - potassium hydroxide aqueous solution (8 mol / l) (reagent).

[0035] Compositions of Examples 1 to 19 and Comparative Examples 1 to 14 were prepared. The compositions of each Example and Comparative Example were prepared by weighing component (A), component (B) (or component (B')), component (C) (or component (C')), component (D), and other components into a beaker and stirring for 10 minutes. Detailed amounts prepared are shown in Table 1, with all values ​​expressed in parts by mass. Table 1 also shows the total amount of components (A) to (C) in the composition, i.e., "total of components (A) to (C)," the ratio of component (A) to the total amount of components (A) to (C) ("component (A) / total of components (A) to (C) (% by mass)"), and the ratio of component (C') to the total amount of components (A) to (C) ("component (C') / total of components (A) to (C) (% by mass)"), respectively.

[0036]

[0037]

[0038]

[0039] The appearance, flowability, and peelability of the compositions prepared in Examples 1 to 19 and Comparative Examples 1 to 14 were checked. The results are summarized in Table 2.

[0040] [Appearance Check] After preparation, the composition was placed in a glass bottle, and after 1 hour had passed, the composition was visually checked according to the following evaluation criteria to determine its "appearance." The appearance was not checked for transparency or opacity, but for the presence or absence of separation of the components. It is preferable that the appearance be rated "A." Evaluation criteria: A: Uniform; C: Non-uniform.

[0041] [Confirmation of flowability] PREGEL (registered trademark) base manufactured by Prianfa Co., Ltd. was applied as a base coat, and the composition was dropped onto the entire surface of a person's hardened nail. The state after 5 seconds was visually confirmed according to the following evaluation criteria to determine "flowability." If the flowability is "C," the peelability check described below is not performed and the result is recorded as "-." Considering the effect on the skin, the flowability is preferably "A": Evaluation criteria A: Does not flow after dropping C: Flows after dropping

[0042] [Removability Verification] Gel nails were applied to ten fingernails of one person. Specifically, the nails were sanded and then cleaned of dust and oil with a nail solvent (main ingredient: ethanol). Next, PREGEL® Base (manufactured by Prianfa Co., Ltd.) was applied wet to a thickness of approximately 100 μm as a base coat. Application was performed with a brush. The base coat was then cured by irradiating it with a nail LED lamp (rated voltage: 100-110 V, 50-60 Hz, power consumption: 36 W, wavelength: 350-400 nm) for 30 seconds. The color coat and top coat were then applied to the surface of the base coat in this order using the same method and cured under the same conditions (i.e., the color coat was applied to the surface of the base coat under the same conditions and cured under the same conditions, and then the top coat was applied thereon under the same conditions and cured under the same conditions). The color coat used was PREGEL (registered trademark) Super Color EX (color: pastel peach) manufactured by Prianfa Co., Ltd., and the top coat used was PREGEL (registered trademark) Cangel EX manufactured by Prianfa Co., Ltd. After one week had passed, the top coat and color coat were scraped off with a 100-grit nail file, exposing the base coat, and a release agent was applied to the entire surface. The release agent was then checked by touch with a metal pusher according to the following evaluation criteria to determine "removability." However, if the flowability was rated "C," a "-" was recorded without conducting a removability test. Considering the working time, an "A" rating is preferable: Evaluation criteria A: The gel nail lifted from the interface with the natural nail within 15 minutes and peeled easily. B: The gel nail lifted from the interface with the natural nail within 15 minutes, but was difficult to peel. C: The gel nail did not lift from the interface with the natural nail within 15 minutes.

[0043]

[0044] Table 2 shows that the removers of Examples 1 to 19 all exhibit excellent flowability and releasability. Therefore, all of the removers of Examples 1 to 19 can remove gel nails in a short time without using aluminum foil or cotton to suppress solvent evaporation. In particular, as in Examples 1 to 17, when the content of component (A) relative to the total content of components (A) to (C) is less than 50% by mass and the content of oil other than component (C) (component (C')) relative to the total content of components (A) to (C) is less than 15% by mass, the appearance is excellent. On the other hand, as in Comparative Examples 1 and 2, when component (A) is not included, the flowability may be graded "C" depending on the amount of component (D). It can be seen that even when the flowability is graded "A," the releasability is graded "B." Compared to Examples 1 to 19, Comparative Example 3, which uses IPA as a comparative component (component (B')) for component (B), exhibits a flowability grade of "C." Comparative Example 4, which does not include component (B), exhibits a releasability grade of "C." Comparative Example 5 and Comparative Examples 6, which do not include component (C), exhibit a releasability grade of "C." In Comparative Example 6, the ratio of the content of oil other than component (C) (component (C')) to the total content of components (A) to (C) was 15 mass% or more, and the appearance was rated as "C." Compared with Examples 1 to 19, Comparative Examples 7 to 14 did not contain component (D), and the flowability was rated as "C."

[0045] In order to maintain the beauty of gel nails, a gel nail removal process is essential as a pretreatment for reapplication. By using the remover according to the present invention, it is possible to reduce the time and number of steps.

[0046] This application is based on Japanese Patent Application No. 2023-159969, filed on September 25, 2023, the disclosure of which is incorporated herein by reference in its entirety.

Claims

1. A stripping agent comprising the following components (A) to (D): Component (A): a carbonate-based solvent; Component (B): a polyether-based solvent not containing a hydroxyl group in the molecule; Component (C): an unsaturated fatty acid as an oil; Component (D): a thickener.

2. The stripping agent according to claim 1, wherein the ratio of the content of said component (A) to the total content of said components (A) to (C) is less than 50 mass% and the ratio of the content of oil other than said component (C) to the total content of said components (A) to (C) is less than 15 mass%.

3. The stripping agent according to claim 1, which does not contain an alcohol-based solvent having 1 to 6 carbon atoms in the molecule.

4. The stripping agent according to claim 1, wherein said component (B) is one or more selected from the group consisting of dimethoxymethane, 1,2-diethoxyethane and diethylene glycol dimethyl ether.

5. The stripping agent according to claim 1, wherein the unsaturated fatty acid of component (C) is an unsaturated fatty acid having 10 to 25 carbon atoms per molecule.

6. The stripping agent according to claim 1, wherein the component (D) is hydrophobically treated fumed silica powder and / or hydroxypropyl cellulose.

7. A method for removing gel nails after application, comprising applying the remover according to any one of claims 1 to 6 to the gel nail after application, said method not using a sheet for suppressing the evaporation of the solvent or a material for impregnating the solvent.

8. A method for removing a gel nail after application, comprising applying the remover according to any one of claims 1 to 6 to the applied gel nail and then leaving it for a specific period of time to remove the gel nail.

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