Manicure composition

Abstract

Provided is a manicure composition that has more improved usability including a feeling during application and stringiness as a manicure composition that has a superior odor compared with conventional ethyl acetate-containing manicure compositions and contains a lower alcohol having 5 or less carbon atoms such as ethanol.　A manicure composition according to the present disclosure is characterized by containing a lower alcohol having 5 or less carbon atoms as a solvent and one or more components (A) including an acrylic resin and an acrylic resin or nitrocellulose. The manicure composition is also characterized in that: the coating film glossiness is 70% or more when the glossiness is measured using an applicator having a thickness of 0.2 mm; and when the content of the acrylic resin of the component (A) is 1, the (acrylic resin):(nitrocellulose) mixing ratio by mass is in the range of 1:10 to 1:0.　The manicure composition is mounted on a manicure composition applicator A shown in Fig. 1 upon use.

Description

Beautiful nail composition

[0001] This specification relates to a beautiful nail composition that has no stringing and is excellent in controllability during application, and is also excellent in gloss, finish, etc.

[0002] As a film-forming agent used in conventional beautiful nail compositions (nail enamels), nitrocellulose is considered optimal and is generally used. In addition, since it is necessary to dissolve nitrocellulose when using it as a beautiful nail composition, generally, acetic esters such as ethyl acetate and butyl acetate are often used as solvents (for example, see Patent Document 1).

[0003] Generally, solvent-based beautiful nail compositions are composed of organic solvents such as acetic esters, film-forming resins such as nitrocellulose, anti-fading agents, colored powders, etc., and various studies have been conducted for the purposes of improving makeup retention, stability, and glossiness. For example, by using a specific silicone resin and nitrocellulose in combination as a film-forming agent, a solvent-based beautiful nail material with a fast drying speed and excellent ease of application to nails can be obtained (for example, see Patent Document 2), or by using powders surface-treated with a compound having a fluoroalkyl group, a beautiful nail material excellent in stability and makeup retention can be obtained (for example, see Patent Document 3), and also, by using a specific siloxy group-containing acrylic copolymer and a film-forming agent in combination, a solvent-based beautiful nail material with less occlusion feeling on nails, excellent smoothness and glossiness of the coating film can be obtained (for example, see Patent Document 4), etc. are known.

[0004] However, in the organic solvent systems such as acetic esters listed in Patent Documents 2 to 4 above, there are some users who are concerned about their characteristic odors, so ethanol systems have sometimes been considered as alternatives to solvents. (For example, see Patent Document 5). The beautiful nail composition of this Patent Document 5 is a French nail type beautiful nail material, and its viscosity was relatively low. Therefore, when combined with a bottle or a forced ejection container as a nail enamel liquid, it cannot be applied to the nails in a large amount, and there may be cases where the finish is not satisfactory, and there are also some problems such as dripping from the nails when trying to apply a large amount.

[0005] Japanese Patent Publication No. 2015-182976 (Claims, etc.), Japanese Patent Publication No. Hei 3-279320 (Claims, etc.), Japanese Patent Publication No. Hei 4-208213 (Claims, etc.), Japanese Patent Publication No. 2006-306867 (Claims, etc.), Japanese Patent Publication No. 2012-72123 (Claims, etc.)

[0006] This disclosure aims to resolve the above-mentioned conventional problems and provides a nail care composition that is superior to general nail care compositions in terms of odor, contains a lower alcohol with 5 or fewer carbon atoms such as ethanol, and offers improved usability in terms of application feel, stringiness, controllability during application, drying properties after application, gloss, and finish.

[0007] As a result of diligent research into the above-mentioned conventional problems, the Disclosers have found that a nail beautifying composition for the above purpose can be obtained by using a lower alcohol having 5 or fewer carbon atoms as a solvent, and one or more resins consisting of (A) acrylic resin and acrylic resin or nitrocellulose, and by setting the gloss of the coating film to a predetermined value or higher when the gloss is measured using a 0.2 mm thick applicator, and by setting the mass mixing ratio of acrylic resin to nitrocellulose within a predetermined range when the content of acrylic resin in component (A) is set to 1, and have completed this disclosure.

[0008] In other words, the nail beautifying composition of the present disclosure contains a lower alcohol having 5 or fewer carbon atoms as a solvent, and one or more resins consisting of (A) acrylic resin and acrylic resin or nitrocellulose, and the gloss of the coating film measured using a 0.2 mm thick applicator is 70% or more, and the mass mixing ratio of acrylic resin to nitrocellulose is in the range of 1:10 to 1:0 when the content of acrylic resin in component (A) is set to 1. The nail beautifying composition preferably further contains at least (B) a plasticizer. The nail beautifying composition has a shear rate of 3.83 (s) at 25°C. －１ The viscosity at ) is 50 to 1,000 mPa·s, and the shear rate is 192 (s －１The viscosity of the solvent is preferably 50 to 1,000 mPa·s. The lower alcohol included as the solvent is preferably the main solvent and is preferably selected from one or more of ethanol, isopropanol, and t-butanol. The plasticizer of component (B) is preferably at least one selected from diisobutyl adipate, sucrose benzoate, sucrose acetate isobutyrate, acetyl triethyl citrate, acetyl tributyl citrate, triethyl citrate, tributyl citrate, and diisopropyl sebacate.

[0009] According to this disclosure, a nail care composition is provided that is superior to general nail care compositions in terms of odor, and as a nail care composition containing a lower alcohol with 5 or fewer carbon atoms such as ethanol, it offers improved usability in terms of application feel and stringiness, as well as superior controllability during application, drying speed after application, gloss, and finish. The purpose and effects of this disclosure are recognized and obtained by using the components and combinations pointed out in particular in the claims. Both the general description above and the detailed description below are illustrative and descriptive, and do not limit the disclosure as described in the claims.

[0010] (a), (b), and (c) are a front view, a longitudinal section, and a transverse section along line C-C, showing an example of a nail polish applicator containing the nail polish composition of this disclosure. (a) to (d) are explanatory diagrams of each operating process of the valve mechanism of the nail polish applicator of Figure 1.

[0011] The embodiments of this disclosure are described in detail below. However, it should be noted that the technical scope of this disclosure is not limited to the embodiments described below, but extends to the inventions described in the claims and their equivalents. Furthermore, this disclosure can be implemented based on the contents disclosed herein and common technical knowledge in the art (including design matters and obvious matters).

[0012] The nail beautifying composition of this disclosure contains a lower alcohol having 5 or fewer carbon atoms as a solvent, and one or more resins consisting of (A) acrylic resin and acrylic resin or nitrocellulose, and is characterized in that the gloss of the coating film measured using a 0.2 mm thick applicator is 70% or more, and when the content of acrylic resin in component (A) is set to 1, the mass blending ratio of acrylic resin:nitrocellulose is in the range of 1:10 to 1:0.

[0013] The solvent used in this disclosure is a lower alcohol having 5 or fewer carbon atoms, and the type of lower alcohol is not particularly limited as long as it does not inhibit the solubility of acrylic resins or nitrocellulose, as described later. Specifically, at least one of the following can be used as a lower alcohol having 5 or fewer carbon atoms: methyl alcohol (methanol), ethyl alcohol (ethanol), n-propyl alcohol, isopropyl alcohol (isopropanol), n-butyl alcohol, sec-butyl alcohol, tert-butyl alcohol (t-butanol), isobutyl alcohol, pentyl alcohol, ethylene glycol, propylene glycol, or propylene glycol monomethyl ether (1-methoxy-2-propanol). Preferably, from the viewpoint of drying properties, as described later, it is desirable to use one or more of ethanol, isopropanol, and t-butanol as the main solvent. The content of these lower alcohols having 5 or fewer carbon atoms is not particularly limited, but in this disclosure, a mass blending ratio of 30% to 90% by mass, and particularly 40% to 75% by mass, based on the total amount of the nail care composition is desirable. If the content is less than 30% by mass, the drying properties will be poor, while if the content is more than 90% by mass, the gloss properties will be poor.

[0014] As a solvent, there are no restrictions on the use of materials and ranges that do not hinder compatibility with lower alcohols having 5 or fewer carbon atoms, such as ethanol, or the solubility of the acrylic resin described later, from the viewpoint of adjusting drying properties. Furthermore, from the viewpoint of adjusting drying properties, it is preferable to include propylene glycol monomethyl ether as one of the lower alcohols having 5 or fewer carbon atoms. The content of this propylene glycol monomethyl ether is not particularly limited, but it is preferable to be 40% by mass or less, and more preferably 35% by mass or less, relative to the total amount of the nail care composition. By setting the content of this propylene glycol monomethyl ether to 40% by mass or less, a desirable composition can be maintained without reducing drying properties. In this disclosure, a lower alcohol having 5 or fewer carbon atoms is used as a solvent, rather than containing acetate esters or water, resulting in superior odor compared to general nail care compositions that use acetate esters.

[0015] The resin used in this disclosure contains (A) an acrylic resin, and one or more of the acrylic resin or nitrocellulose. Depending on the blending ratio described below, the acrylic resin can be used alone or in combination with the acrylic resin and nitrocellulose. The acrylic resin of component (A) that can be used functions as a film-forming agent and a dispersion stabilizer. Specifically, at least one selected from acrylates copolymer, acrylates copolymer ammonium, (acrylates / methylstyrene / styrene) copolymer ammonium, and (ethylhexyl acrylate / methyl methacrylate) copolymer is used. Preferably, from the viewpoint of dispersion stability and film performance, it is desirable to use the above acrylic resin which has excellent solubility in the solvent of this formulation, such as a lower alcohol with 5 or fewer carbon atoms. The content of these acrylic resins of component (A) is preferably 1% by mass or more and 50% by mass or less, and particularly preferably 10% by mass or more and 35% by mass or less, based on the total amount of the nail beautifying composition. If the content is less than 1% by mass, problems with gloss and finish may occur, while if it is more than 50% by mass, the viscosity may increase, making it difficult to spread on the nail.

[0016] Furthermore, the nitrocellulose of component (A) used functions as a coating (film) forming agent, and is not particularly limited as long as it is nitrocellulose used in nail beautifying compositions. However, it is preferable to use nitrocellulose that has excellent solubility in the solvent of this formulation, which is a lower alcohol with 5 or fewer carbon atoms, or preferably propylene glycol monomethyl ether. The content of this nitrocellulose is preferably 50% by mass or less, and particularly preferably 30% by mass or less, based on the total amount of the nail beautifying composition. On the one hand, if the nitrocellulose content is less than 1%, problems may arise with the strength of the coating after application and drying, while on the other hand, if it is more than 50%, it may become difficult to spread on the nail due to increased viscosity.

[0017] In this disclosure, when using acrylic resin and nitrocellulose in combination as described above, it is preferable that the mass ratio of acrylic resin to nitrocellulose is in the range of 1:10 to 1:0, with the acrylic resin content of component (A) being 1. By suitably changing this mixing ratio within the above range, the degree of stringing during application changes, which is desirable to obtain uniform application properties and prevent fingers or clothes from getting dirty during application. Furthermore, since this mixing ratio also affects the gloss of the coating film, it is desirable that the mixing ratio of acrylic resin to nitrocellulose be about 1:2 to 1:0 by mass ratio, especially in order to maximize the effects of this disclosure.

[0018] In this disclosure, it is preferable to further include a plasticizer as component (B) in order to obtain a suitable coating feel. The plasticizer that can be used is preferably at least one selected from diisobutyl adipate, sucrose benzoate, sucrose acetate isobutyrate, acetyl triethyl citrate, acetyl tributyl citrate, triethyl citrate, tributyl citrate, and diisopropyl sebacate, but there are no restrictions on the use of any additive that has a plasticizing effect. The content of this plasticizer is preferably 0.5% by mass or more and preferably 25% by mass or less, and particularly preferably 1% by mass or more and 10% by mass or less, based on the total amount of the nail beautifying composition. By setting the content to 0.5% by mass or more, the durability of the coating after drying can be further improved, while by setting it to 25% by mass or less, there will be no adverse effect on drying properties and film-forming properties.

[0019] In the nail care composition disclosed herein, the colorants used to color nails, etc., are not particularly limited as long as they are colorants that have been conventionally used in nail care compositions. For example, inorganic and organic pigments such as Red No. 201, 202, 220, Yellow No. 4 Lake, Ultramarine, Red Iron Oxide, Carbon Black, Titanium Dioxide, pearl pigments, and other luminous pigments can be used. In addition, pigments necessary for color changes can be appropriately included to the extent that they do not impair the effects of the disclosure, and various surfactants and resins acting as dispersants can be appropriately included separately to the extent that they do not impair the effects of the disclosure, as needed.

[0020] Furthermore, the nail care composition disclosed herein may contain other optional components as appropriate, provided that they do not impair the effects of the disclosed invention or the stability of the system. Examples include various surfactants other than those used as dispersants, preservatives, antioxidants, reduction inhibitors, chelating agents, UV absorbers, viscosity modifiers, oily components, silicone derivatives, fragrances, plant and animal extracts, known polymer components, etc.

[0021] The nail care composition disclosed herein, when measured using a cone-plate viscometer at a temperature of 25°C, exhibits a shear rate of 3.83 (s). －１The viscosity of the solution is 50-1000 (mPa·s), and the shear rate is 192 (s －１ The viscosity of the (A) component is preferably 50 to 1000 (mPa·s). If the viscosity falls below the lower limit of the viscosity range at the predetermined shear rate, it will run after application, resulting in uneven coating and insufficient gloss due to insufficient film thickness. Conversely, if the viscosity exceeds the upper limit of the viscosity range, it will be difficult to spread on a fingernail, and defects such as streaks may occur in the coating film. The viscosity range can be adjusted by combining the acrylic resin, nitrocellulose, plasticizer, and solvent of component (A) to achieve a suitable content.

[0022] The nail beautifying composition of this disclosure is prepared by mixing and dispersing each of the above-mentioned components in the above-mentioned content ranges using a mixing and dispersing machine, such as a bead mill, homomixer, disper, attritor, ball mill, sand grinder, etc.

[0023] The nail polish composition disclosed herein can achieve a suitable gloss when actually applied to the nail by measuring the gloss of the coating film with a 0.2 mm applicator to a gloss of 70% or more. This gloss of 70% or more can be adjusted by combining the acrylic resin, nitrocellulose, plasticizer, and solvent of component (A) to a suitable content, and further by suitably combining the above-mentioned mixing and dispersing apparatus. In this disclosure, "gloss" refers to the gloss of the coating film when tested according to the general test method for paints in JIS 5600-4-7.

[0024] The nail care composition of this disclosure, configured in this manner, is used in a nail care applicator equipped with a container. The container for containing the nail care composition of this disclosure is not limited to a general bottle type or a pen type with a forced dispensing mechanism, but can be used in various container forms depending on the purpose of use. For example, it can be suitably used in a nail care applicator comprising a bottle (container body) containing the nail care composition of the above composition and a brush attached to the cap that serves as an applicator, or in a nail care applicator comprising at least a liquid storage space containing the nail care composition of the above composition and a so-called pen-core type applicator made of fibers solidified with resin or the like, or fibers fused together, or a brush-shaped applicator made of bundled fibers, wherein the nail care composition is transported from the liquid storage space to the applicator by capillary force or by a valve member.

[0025] An example of a nail polish application tool that can be used is the nail polish application tool A shown in Figure 1, which contains the nail polish composition having the above configuration. Figures 1(a), (b), and (c) are an external view, a longitudinal section view, and a cross-sectional view along the line C-C of the nail polish application tool A, and Figures 2(a) to (d) are explanatory diagrams of each operating process of the valve mechanism of the nail polish application tool A shown in Figure 1. As shown in Figures 1 and 2, the nail polish application tool A has a tank-shaped inner shaft 12 that can move back and forth within a generally cylindrical outer shaft 10 with an open rear end 10b, and when the user knocks the rear end 12b of the inner shaft 12 the inner shaft moves forward relative to the outer shaft 10, activating the valve mechanism 14 described later, which supplies the nail polish composition H of this disclosure to an applicator 16 provided at the tip 10a of the outer shaft 10. The tip 10a of the outer shaft 10 is tapered in a stepped shape, and the outer circumference (flared) of the bowl-shaped tip 18a of the nail polish introduction tube 18 (a conduit for circulating the nail polish composition H from the valve mechanism 14 to the applicator 16 side) is in contact with the front surface of the tip 10a. The rear part of the applicator 16 is inserted into the tip 18a of the nail polish introduction tube 18 via a seal ring 20. The seal ring 20 and the tip 18a of the nail polish introduction tube 18 are passed through the hollow part of the hollow, tapered cylindrical tip shaft 22 from the center of the applicator 16, and the tip shaft 22 is fitted onto the tip 10a of the outer shaft, thereby fixing the applicator 16, the seal ring 20, and the tip 18a of the nail polish introduction tube to the outer shaft 10. Furthermore, a cap 24 that covers and protects the coating body 16 is detachably fitted to the tip 10a of the outer shaft, and the cap 24 is biased so that the inner cap 24a inside presses against the tip shaft 22 by a spring 24b.

[0026] The inner shaft 12 has a closed rear end 12b, which forms a liquid storage space 12c that houses the coating body 16 (sometimes housing a stirring ball 12d), while the front end (tip of the inner shaft) 12a houses the valve mechanism 14 and is fixed by the inner tip shaft 26. Specifically, with the valve mechanism 14 housed in the front end 12a, which is tapered towards the front of the inner shaft 12, the rear end 18b of the nail polish introduction pipe 18 is slidably connected to the valve mechanism 14, and a packing 28 is interposed at the front end of the valve mechanism 14 to fix the inner tip shaft 26 to the front end 12a of the inner shaft by screwing or the like. Here, the valve mechanism 14 allows or stops the supply of the nail polish composition H to the coating body 16 by the relative axial movement of the valve seat 30 and valve stem 38 in the passage between the liquid storage space 12c that houses the nail polish composition H and the coating body 16. The valve seat 30 of the valve mechanism 14 is a substantially cylindrical body with openings at both ends in the axial direction. Liquid-tight portions that slide against the valve stem are formed on the front side (front valve member 32) and rear side (rear valve member 34) of the interior. The rear opening faces the liquid containment space 12c, and the front opening faces the coating body 16. As shown in Figure 1(b), guide columns 34c are formed in a rib shape on the inner wall of the rear valve member 34 of the valve seat 30, extending from approximately the center in the longitudinal direction to the rear, to guide the valve stem 38 which protrudes radially from the inner wall. These guide columns 34c prevent the valve stem 38 from tilting due to impact when the outer shaft 10 is dropped, causing it to ride up onto the end face of the front valve member 32 and resulting in knock failure. Specifically, the front valve member 32 has a flange 32a that expands in diameter at the front end and a rear inner circumferential surface that expands in diameter more than the front inner circumferential surface, giving it a roughly cylindrical shape overall. This rear inner circumferential surface corresponds to the front liquid-tight portion 32b shown in Figures 2(a) and (b). The rear valve member 34 has a flange 34a that expands in diameter at the front end and a rear end that narrows in diameter in a stepped manner, giving it a roughly cylindrical shape. This narrowed portion's inner circumferential surface corresponds to the rear liquid-tight portion 34b. The front valve member 32 is inserted concentrically into the rear valve member 34 from the front side, and the flanges 32a and 34a are stacked on top of each other. The packing 28 is then stacked on the front end, and the assembly is covered with the inner front shaft 26 and screwed into the front end 12a of the inner shaft to fix it in place. The front surface of the narrowed portion at the rear end of the rear valve member 34 is the part that receives the spring member 36, which will be described later.The valve stem 38 is housed within the hollow space of the front valve member 32 and the rear valve member 34 so as to be movable back and forth. The outer circumference of the valve stem 38 is provided with a front piston portion 38a that slides in a liquid-tight manner against the front liquid-tight portion 32b of the front valve member 32 in the valve seat 30, and a rear piston portion 38b that slides in a liquid-tight manner against the rear liquid-tight portion 34b of the rear valve member 34 in the valve seat 30. A space 40 for the flow of the nail polish composition H is provided between the outer circumference of the approximately central part of the valve stem 38 and the inner surface of the valve seat 30. Specifically, the front piston portion 38a of the valve stem 38 is formed by a flexible, enlarged umbrella-shaped flange. Furthermore, the rear piston portion 38b is formed with a smooth outer surface that tapers towards the rear, so that when the valve stem 38 moves backward, the smaller diameter rear end passes through the opening of the rear valve member 34, and then the larger diameter central portion comes into close contact and sliding contact with the rear liquid-tight portion 34b of the rear valve member 34.

[0027] As described above, the valve mechanism 14 has a spring member 36 interposed between the valve seat 30 and the valve stem 38. The spring member 36 contacts the piston portion 38a on the front side of the valve stem 38 from the rear, biasing it to be positioned at the front end relative to the valve seat 30. Therefore, unless the rear end of the inner shaft 12 is knocked to apply pressing force, the spring member 36 positions the piston portion 38a on the front side in contact with the tip of the front liquid-tight portion 32b, as shown in Figures 1(b) and 2(a). Furthermore, the inner front shaft 26 contacts the annular projection 42 inside the outer shaft 10 to prevent the inner shaft 12 from moving further rearward and coming out. Furthermore, the rear end portion 18b of a nail polish introduction pipe (pipe) 18, which connects the front opening of the valve seat body 30 (the tip opening of the front valve member 32), is inserted into the front opening and connected to the applicator 16. Inside this nail polish introduction pipe 18 is a guide rod 44 that guides the nail polish composition H toward the applicator 16. The gap between the guide rod 44 and the inner surface of the nail polish introduction pipe 18 is sized to guide the nail polish composition H. Regarding the positional relationship between the guide rod 44 and the nail polish introduction pipe 18, the guide rod 44 is supported by multiple ribs (not shown) that protrude from the inside of the tip portion 18a of the introduction pipe 18, so that the guide rod 44 is positioned at the radial center of the nail polish introduction pipe 18, thereby eliminating radial play. The tip portion of the guide rod 44 is inserted into the rear part of the applicator 16. In the valve mechanism 14 of this type of nail polish applicator A, the distance between the front piston portion 38a and the rear piston portion 38b of the valve stem 38 is set to be shorter than the distance between the front liquid-tight portion 32b and the rear liquid-tight portion 34b within the valve seat 30. That is, the valve seat 30 and the valve stem 38 are formed to be able to take on three states by relative movement between them: a first state in which the front piston portion 38a of the valve stem 38 slides against the front liquid-tight portion 32b within the valve seat 30; a second state in which the front piston portion 38a and the rear piston portion 38b of the valve stem 38 do not slide against either of the liquid-tight portions within the valve seat 30; and a third state in which the rear piston portion 38b of the valve stem 38 slides against the rear liquid-tight portion 34b within the valve seat 30.

[0028] In the nail polish applicator A configured in this way, in the normal state (non-knock) when the user does not knock the rear end 12b of the inner shaft, as shown in Figure 2(a), the spring member 36 is in contact with the piston portion 38a on the front side of the valve stem 38 from the rear, biasing it to be positioned at the front end relative to the valve seat 30. When knocking of the rear end 12b of the inner shaft is initiated, first, as shown in Figure 2(b), the valve stem 38 moves less than a first distance rearward from the position of the front end relative to the valve seat 30, as in the first state described above, and the piston portion 38a on the front side of the valve stem 38 slides in close contact with the front liquid-tight portion 32b of the valve seat 30, and the piston portion 38b on the rear side of the valve stem 38 is separated from the rear liquid-tight portion 34b of the valve seat 30, creating a state of pressurization on the liquid containment space 12c side. In this state, the piston portion 38b on the rear side of the valve stem 38 is separated from the rear liquid-tight portion 34b of the valve seat 30, but the piston portion 38a on the front side of the valve stem 38 is in close contact with the front liquid-tight portion 32b of the valve seat 30, so even if the internal pressure of the liquid containment space 12c increases, the nail polish composition H will not be blown out. Furthermore, as the knocking of the rear end portion 12b of the inner shaft continues, as shown in Figure 2(c), the valve stem 38 moves rearward relative to the valve seat 30 by a distance greater than the first distance but less than the second distance, as in the second state, and the piston portion 38a on the front side of the valve stem 38 separates from the front liquid-tight portion 32b of the valve seat 30. At that time, the piston portion 38b on the rear side of the valve stem 38 is separated from the rear liquid-tight portion 34b of the valve seat 30, and the front opening and rear opening are in communication through the inside of the valve seat 30. Because it is in communication with the atmosphere in this way, if the internal pressure rises, the nail polish composition H will try to flow out towards the applicator. However, due to the pressing operation, this state occurs only for a moment, and there is no blowout of the nail polish composition H. In addition, the air displacement of the liquid containment space 12c is improved. Furthermore, the nail polish composition H flows out towards the applicator 16 side via the guide rod 44.If the knocking of the inner shaft rear end 12b continues, as shown in Figure 2(d), the valve stem 38 moves more than the second distance to the rear of the valve seat 30, as in the third state described above. At this point, the piston portion 38a on the front side of the valve stem 38 separates from the front liquid-tight portion 32b of the valve seat 30, and the piston portion 38b on the rear side of the valve stem 38 slides in close contact with the rear liquid-tight portion 34b of the valve seat 30, guiding the nail polish composition H to the applicator 16. In this case, the space 40 through which the nail polish composition H flows is completely isolated from the liquid containment space, so the nail polish composition H accumulated in the valve mechanism 14 flows smoothly through the nail polish introduction pipe 18 to the applicator 16. In this case, when the valve stem 38 and valve seat 30 move relative to each other in the axial direction, the distance required to reach the second state is much smaller than the distance required to reach the first and third states, and is a short distance (a distance that can be passed through in an instant) that allows the pressure in the liquid containment space 12c to escape to the outside without dripping the nail polish composition H. When the valve mechanism 14 is operated with the forward side facing downward to move the valve seat 30 and valve stem 38 relative to each other, in the first state, the forward piston portion 38a closes the side of the applicator 16, allowing the nail polish composition H to flow into the space between it and the inner surface of the valve seat. Then, in the second state, the liquid containment space 12c is opened to the atmosphere from the applicator 16 through the space between it and the inner surface of the valve seat. Furthermore, in the third state, the rear piston portion 38b closes the side of the applicator 16, allowing the nail polish composition H between it and the inner surface of the valve seat to flow into the applicator 16, thus performing a pumping action.

[0029] Therefore, in this form of nail polish applicator A, the valve mechanism 14 is operated to pressurize the liquid storage space 12c in the first state, release the pressure in the liquid storage space 12c in the second state, and smoothly flow the nail polish composition liquid H into the applicator 16 in the third state. As a result, the air exchange properties are extremely good, and even if the air in the liquid storage space 12c expands in volume due to rising temperature or the pressure in the liquid storage space 12c becomes too high, there is no accidental discharge of the nail polish composition H that causes dripping, and the nail polish composition H flows out smoothly, so that it can be applied to the tip of the nail or used to draw lines or patterns directly on the nail.

[0030] The nail polish composition of this disclosure, configured in this manner, contains a lower alcohol having 5 or fewer carbon atoms as a solvent, and one or more resins consisting of (A) acrylic resin and acrylic resin or nitrocellulose, and the gloss of the coating film measured using a 0.2 mm thick applicator is 70% or more, and when the content of acrylic resin in component (A) is set to 1, the mass blending ratio of acrylic resin:nitrocellulose is in the range of 1:10 to 1:0, and because ethyl acetate is not used compared to general nail polish compositions, it is superior in terms of odor, and as a nail polish composition containing a lower alcohol with 5 or fewer carbon atoms such as ethanol, it provides a nail polish composition that is superior in terms of controllability during application, drying properties, drying properties after application, gloss, and finish, with improved usability such as application feel and stringiness.

[0031] Next, the present disclosure will be further described by examples and comparative examples, but the present disclosure is not limited to the following examples.

[0032] [Examples 1-7 and Comparative Examples 1-4] Each nail beautifying composition was prepared by mixing and dispersing the formulations shown in Table 1 using a homomixer or disperser. Each nail beautifying composition obtained above in Examples 1-7 and Comparative Examples 1-4 was then subjected to the following method at a shear rate of 3.83 (s) －１ ), 192(s －１ The viscosity, gloss, stringiness, drying properties, odor, and finish were evaluated at 25°C in the following conditions. These results are shown in Table 1 below.

[0033] [Method for measuring viscosity] For each nail polish composition obtained, a predetermined shear rate [3.83 (s)] was measured at a temperature of 25°C using a cone-plate viscometer (TV-30 type viscometer, EMD type viscometer, standard cone plate, manufactured by Tokimec Co., Ltd.). －１ ), 192(s －１ The viscosity was measured in ).

[0034] [Method for Measuring Glossiness] For each nail polish composition obtained, the glossiness of the coating film was measured when tested according to the general test method for paints in JIS 5600-4-7 (only the film applicator used was one that resulted in a different liquid film thickness than that specified in JIS 5600-4-7). Specifically, glossiness was measured using a mirrored glass plate, a 0.2 mm film applicator, and a digital angle-bending gloss meter (UGV-5) manufactured by Suga Test Instruments Co., Ltd.

[0035] [Evaluation Method for Stringiness] Each nail care composition obtained was filled into a standard bottle container, and the presence or absence of stringiness was evaluated by five actual users according to the following evaluation criteria. Evaluation Criteria: S: No one out of five people observed stringiness. A: One or two out of five people observed stringiness. B: Three or four out of five people observed stringiness. C: Five out of five people observed stringiness.

[0036] [Method for Evaluating Drying Speed] Using a 0.2 mm film applicator, the film was applied to a smooth test plate in a constant temperature and humidity chamber (25°C, 65% RH), left for 120 seconds, and then scratched with a cotton swab to evaluate the drying speed according to the following criteria. Evaluation Criteria: A: Fast drying, good B: Somewhat slow, somewhat fast C: Too slow, too fast

[0037] [Odor Evaluation Method] Each nail care composition obtained was filled into a standard bottle container, and the degree to which five actual users perceived a solvent odor upon opening the container lid was evaluated according to the following criteria. Evaluation Criteria: A: None of the five people perceived a solvent odor. C: One or more people perceived a solvent odor.

[0038] [Evaluation Method for Finish Quality] The product was applied to transparent nail tips using a standard bottle container, and the finish quality was evaluated according to the following criteria. Evaluation Criteria: A: The coating film is even after drying. C: The coating film is uneven after drying.

[0039]

[0040] *1 to *5 in Table 1 above are as follows. *1: Nitrocellulose: DHX5-10, manufactured by Inaba Sangyo Co., Ltd. *2: Acrylates copolymer: Rubimer 100P, manufactured by BASF *3: Triethyl acetyl citrate: Citrofex A-2, manufactured by Morimura商事 *4: Terpene phenol resin: YS Polyster S145, manufactured by Yasuhara Chemical Co., Ltd. *5: Maleic acid resin: Markid No. 33, manufactured by Arakawa Chemical Industries, Ltd.

[0041] As is clear from the results in Table 1 above, Examples 1 to 7 within the scope of the present disclosure are superior in terms of odor compared to general nail cosmetic compositions containing ethyl acetate, have less stringing, and are nail cosmetic compositions excellent in glossiness, drying property, and finish performance compared to Comparative Examples 1 to 4 outside the scope of the present disclosure. Looking at the comparative examples individually, Comparative Example 1 is a formulation using ethyl acetate as a solvent without using ethanol or a plasticizer, Comparative Example 2 is a formulation not using the acrylic resin as component (A), and Comparative Examples 3 and 4 are formulations not using an acrylic resin or nitrocellulose. In the case of these nail cosmetic compositions of Comparative Examples 1 to 4, it was found that the effects of the present disclosure could not be exhibited.

[0042] It becomes a nail cosmetic composition suitable for nail enamel.

[0043] A Nail Cosmetic Applicator H Nail Cosmetic Composition 10 Outer Shaft 12 Inner Shaft 14 Valve Mechanism 16 Application Body

Claims

1. A nail care composition characterized by containing a lower alcohol having 5 or fewer carbon atoms as a solvent, and one or more resins consisting of (A) acrylic resin and acrylic resin or nitrocellulose, wherein the gloss of the coating film measured using a 0.2 mm thick applicator is 70% or more, and when the content of acrylic resin in component (A) is set to 1, the mass blending ratio of acrylic resin:nitrocellulose is in the range of 1:10 to 1:

0.

2. The nail beautifying composition according to claim 1, further comprising (B) a plasticizer at least.

3. The nail beautifying composition has a shear rate of 3.83 (s) at 25°C. －１ The viscosity at ) is 50 to 1,000 mPa·s, and the shear rate is 192 (s －１ The nail beautifying composition according to claim 1 or 2, characterized in that the viscosity of the ) is 50 to 1,000 mPa·s.

4. The nail care composition according to claim 1 or 2, wherein the lower alcohol contained as the solvent is the main solvent and is selected from one or more of ethanol, isopropanol, and t-butanol.

5. The nail care composition according to claim 2, characterized in that the plasticizer of component (B) is at least one selected from diisobutyl adipate, sucrose benzoate, sucrose acetate isobutyrate, acetyl triethyl citrate, acetyl tributyl citrate, triethyl citrate, tributyl citrate, and diisopropyl sebacate.

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