Heated adhesive for eyelash extensions

Abstract

We provide a heated adhesive specifically for eyelash extensions that solves the problems of cyanoacrylate adhesives, which are vulnerable to moisture and friction, easily become brittle, and are irritating to the eyes and skin. [Solution] The adhesive used in eyelash extension procedures is a thermoplastic resin adhesive 1 containing ethylene vinyl acetate copolymer (EVA) as its main component, with added hydrocarbon resin and coloring pigment. It is a rectangular parallelepiped adhesive measuring 0.5 mm thick, 5 mm long, and 1 mm wide, with multiple pieces arranged in an array on a release sheet 2 so that they can be peeled off one by one for use. It softens and melts when heated and hardens when cooled, but does not melt at temperatures below 70°C. It eliminates weakness to moisture and friction, brittleness, and eye and skin irritation, and maintains a good adhesive state for a long time. It softens and melts when heated in the range of 70°C to 120°C, and returns to a solid state when cooled.

Description

[Technical Field]

[0001] This invention relates to an adhesive used in eyelash extension procedures, and in particular to an adhesive specifically for heated eyelash extensions that softens and melts at temperatures between 70 and 120°C, but does not melt at temperatures below 70°C. [Background technology]

[0002] Eyelash extensions are a makeup technique in which any number of extension eyelashes are attached to each natural eyelash using adhesive. The extension eyelashes and adhesive have the effect of changing the impression of the eyes in the same way as mascara or eyeliner, and are also thought to be effective in protecting against UV rays, making them popular with many people.

[0003] Conventionally, cyanoacrylate adhesives have been used primarily as adhesives for eyelash extension procedures.

[0004] Cyanoacrylate adhesives harden by reacting with moisture in the air, allowing for instant adhesion, but they are vulnerable to water and hot water, and become brittle when rubbed with fingers against the eyelids or base of the eyelashes. This means they are unable to follow the movement of the eyelashes, which require flexibility, causing discomfort and causing the extension eyelashes to fall off, and they have the disadvantage of not lasting long after treatment.

[0005] Furthermore, cyanoacrylate adhesives can emit formaldehyde when they harden, which can be very irritating to the eyes and skin, causing allergic reactions in both the person receiving the extensions and the person applying them, which can sometimes force a technician (beautician) to give up their career as an eyelash extension technician.

[0006] Furthermore, unlike the adhesive of the present invention, there has never been an adhesive that does not melt at temperatures below 70°C and is provided specifically for eyelash extensions. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 4981983 [Patent Document 2] Patent No. 6676310

[0008] Patent Document 1 is an invention by the applicant of the present invention, but it is different from the present invention in that it relates to eyelash extensions and a method for attaching eyelash extensions that do not use adhesive.

[0009] The problem with Patent Document 1 is that when you pull with your fingers, only the extension eyelashes come out, causing most of the extension eyelashes to come out in a short period of time. To solve this problem, a new invention was needed that would improve adhesive strength and cohesive force.

[0010] Patent Document 1 does not teach what components or composition the resin for fixing eyelashes for extensions should have in order to maintain the eyelashes for extensions in a good fixed state for a long period of time.

[0011] The invention of Patent Document 2 is an eyelash extension that does not use adhesive but has a specially shaped fixing part. When external energy is applied to the protruding member at the fixing part, the eyelash extension bends, contracting and fixing the human eyelash, and does not use adhesive.

[0012] The invention of Patent Document 2 does not teach what components or composition the resin used to fix the eyelashes for extensions should have in order to maintain the eyelashes for extensions in a good fixed state for a long period of time.

[0013] According to the contents of paragraph

[0096] of Patent Document 2, it is instructed that the resin part is heated and fixed using tweezers heated to a high temperature of 200°C. However, performing treatment at a high temperature of 200°C not only increases the risk of burns to the treatment recipient, but also raises concerns about the burden on the practitioner due to the repetitive work.

[0014] In addition, the material used to manufacture eyelash extensions is polybutylene terephthalate (PBT), the same material used in toothbrushes, cut into pieces about 5 cm long and tapered at the tips (hair tips) using a solvent.The fibers are then cut even shorter (about 5 to 18 mm) to resemble human eyelashes, and then wrapped around an aluminum pipe or similar before being heated in an oven or similar to memorize the curl (angle) shape.However, the temperature of the heat applied in this process is around 160°C, so there is a concern that if heat exceeding 200°C is applied during the treatment, the fibers will deform and become unusable.

[0015] When a thermoplastic resin that melts at a low temperature of 50°C, as described in paragraph

[0090] of Patent Document 2, is used, the surface temperature of human eyelashes can exceed 50°C when exposed to direct sunlight in summer, and similarly, it is thought that the temperature inside a vehicle can also exceed 50°C. Therefore, if the thermoplastic resin deforms or melts at such a low temperature, there is a concern that the deformed or melted thermoplastic resin may injure the eyelids or eyes. Summary of the Invention [Problem to be solved by the invention]

[0016] The adhesive of this invention overcomes the drawbacks of conventional cyanoacrylate adhesives, such as their weakness to friction and impact. Furthermore, it is less irritating to the eyes and skin, preventing those undergoing or performing treatment from suffering from allergies or irritant contact dermatitis caused by the use of cyanoacrylate adhesives, and provides a heat-sensitive adhesive that maintains good adhesion for approximately one month after treatment. [Means for solving the problem]

[0017] To solve the above problems, the adhesive of the present invention uses a thermoplastic resin as the main component. As an example, we provide a thermoplastic resin adhesive containing ethylene vinyl acetate copolymer (EVA) and further containing a hydrocarbon resin and a coloring pigment (carbon black, etc.).

[0018] The adhesive of this invention has the property of softening and melting when heated for 1 to 5 seconds at a temperature between 70°C and 120°C, and returning to a solid state when cooled (left to stand) for 1 to 5 seconds. By adding approximately 39 to 49 wt% of a hydrocarbon resin to ethylene vinyl acetate copolymer (EVA), one example of a component, the softening and melting temperature is adjusted to a range of approximately 70 to 120°C, and a physical structure is formed that promotes recrystallization after cooling. As a result, the adhesive does not exceed its glass transition temperature after cooling, and has the property of not remelting at room temperature or below 70°C. This structure is achieved only through the synergistic effect of the composite composition. [Effects of the Invention]

[0019] The adhesive of this invention will not melt in environments where temperatures reach 50°C, so even if you are exposed to direct sunlight in the summer or inside a hot vehicle, the adhesive will not melt and get into your eyes.

[0020] The adhesive of this invention melts and adheres even at temperatures similar to those of commercially available hot eyelash curlers (around 90°C), so it can be used with tools at temperatures that will not burn the eyelashes or cause any damage such as burns to the skin.

[0021] Because this device is an adhesive, the type of extension eyelashes used in the procedure (thickness, length, shape, color, number, material) can be selected according to the preferences of the person receiving the procedure and the person performing the procedure.

[0022] The adhesive of this invention is primarily composed of a water-resistant and flexible thermoplastic resin. For example, ethylene vinyl acetate copolymer (EVA) is used, and by compounding it with a hydrocarbon resin to improve tack and impact resistance, it achieves impact resistance and flexible conformability not available with conventional cyanoacrylate adhesives. Furthermore, the addition of a small amount of coloring pigment (e.g., carbon black) ensures uniform heat absorption during heating and prevents uneven melting during application.

[0023] Unlike cyanoacrylate adhesives, the adhesive of this invention is highly flexible and does not interfere with the natural movement of the eyelashes, so good adhesion lasts for a long time.

[0024] Unlike cyanoacrylate adhesives, the adhesive of this invention does not require time-consuming dissolution with a solvent (such as propylene carbonate) when removing it; it can be removed simply by heating it, eliminating the need for a solvent. It also eliminates the risk of solvent getting into the eyes, improving work efficiency and saving time.

[0025] Unlike cyanoacrylate adhesives, the adhesive of this invention does not use solvents, and therefore does not cause irritation from volatile substances, resulting in almost no eye or skin irritation, improving safety for both the person receiving the eyelash extension treatment and the person performing the treatment.

[0026] Cyanoacrylate adhesives used in eyelash extensions generally have a shelf life of approximately one to two months after opening, but cyanoacrylate adhesives that have deteriorated beyond the expiration date often do not fully harden, and using such deteriorated adhesives can cause problems such as irritant contact dermatitis. The adhesive of this invention was developed specifically for eyelash extensions and is characterized by its inability to melt at temperatures below 70 degrees, providing unprecedented safety and ease of use.

[0027] The cyanoacrylate adhesive used in eyelash extensions is liquid, so the amount applied to the object varies depending on the type of hair used and the practitioner's method of operation. However, the adhesive of this invention can be provided in a consistent amount, reducing poor adhesion due to insufficient application. [Brief explanation of the drawings]

[0028] [Figure 1] 1A, 1B, 1C, and 1D are a plan view, a side view, and a front view, respectively, showing an embodiment of an adhesive of the present invention. [Figure 2] FIG. 2 is a front view showing an embodiment in which a plurality of adhesives of the present invention are aligned on a release sheet. [Figure 3] 1 is a diagram illustrating how the adhesive of the present invention is attached to a person's eyelashes. [Figure 4] 1 is a diagram illustrating how the adhesive of the present invention is applied to a person's eyelashes and then eyelash extensions are attached on top of them. [Figure 5] This is a diagram illustrating how the adhesive of the present invention is sandwiched between a human eyelash and an extension eyelash, and the adhesive portion is heated and melted with heated Teflon-coated tweezers to bond them together. DETAILED DESCRIPTION OF THE INVENTION

[0029] The adhesive of the present invention may have the following composition, for example: (1) 49-59 wt% ethylene vinyl acetate copolymer (EVA), (2) 39-49 wt% hydrocarbon resin, and (3) 1-3 wt% color pigment (carbon black).

[0030] The adhesive of this invention requires thermoplastic resin as an essential component, but it is also possible to use modifiers such as acrylic resin, urethane resin, alicyclic hydrocarbon resin, aromatic hydrocarbon resin, olefin resin, and styrene resin in combination.

[0031] An embodiment of the adhesive of the present invention will be described with reference to Figures 1 and 2. Figure 1 shows an example of the specifications for one adhesive. The adhesive is a rectangular parallelepiped with a thickness (depth) of 0.5 mm, a length of 5 mm, and a width of 1 mm, and is removably placed on a release sheet as shown in Figure 2. One method for fixing the adhesive when placed on a release sheet as shown in Figure 2 is to apply an acrylic adhesive or the like to the adhesive or the release sheet.

[0032] Although an example of the adhesive of the present invention is shown in Figure 1, the size and shape can be changed as needed. For example, the shape of the adhesive is not limited to a rectangular parallelepiped, but may be polygonal, cylindrical, elliptical, etc., and may be hollow or grooved. [Example] Example 1: Example of adhesive compound materials

[0033] As an example, the adhesive of the present invention is composed of 49-59 wt% ethylene vinyl acetate copolymer (EVA) as described in claim 1, 39-49 wt% hydrocarbon resin, and 1-3 wt% black pigment (carbon black), and has the functionality of a hot melt adhesive as described in claim 2, which softens and melts when heated at 70-120°C, and cools and hardens in 1-5 seconds when removed from the heat. One of the reasons why the adhesive softens and melts at a low temperature and in a short time of about 1-5 seconds, and cools and hardens in about 1-5 seconds, is that the adhesive of the present invention is small, measuring less than 5mm square. Example 2: Treatment example

[0034] If silicones, such as those found in mascara or foundation, are present on the person's eyelashes, they should be removed first to prevent adhesiveness and prevent burns. A protective sheet should be applied around the eyelids to prevent the eyelids from feeling hot or getting burned, and a heat-resistant silicone sheet should then be placed over the protective sheet before beginning the procedure. Next, hold the tweezers shown in 4 of Figure 3(a) and apply the adhesive held with the tweezers shown in 1a of Figure 3(a) to the top (or side or bottom) of the person's eyelashes as shown in 1b of Figure 3. Next, grasp the eyelash extensions (approximately 5-18 mm long, 0.03-0.25 mm thick) shown in 5 of Figure 4(a) with the tweezers shown in 4 of Figure 2(a) and attach the eyelash extensions shown in 5 of Figure 4(a) to the person's eyelashes shown in 3 of Figure 4(b). Next, use heated Teflon-coated tweezers (7 in Figure 5(a)) to clamp the human eyelashes, adhesive, and extension eyelashes (6 in Figure 5(a)), and apply heat (8 in Figure 5(a)) for 1 to 5 seconds to soften and melt the adhesive. Then, release the heated Teflon-coated tweezers (7 in Figure 5) and leave it for 1 to 5 seconds to cool and harden, completing the first adhesion as shown in Figure 5(b).

[0035] When gluing the second lash, do not glue it to the eyelashes of the person immediately next to it, as touching the already glued and hardened part shown in 6 in Figure 5(b) may cause the adhesive to re-melt. Instead, leave a gap of at least one eyelash and glue it like the second extension eyelash shown in 9 in Figure 5(c). Repeat this process until you have attached the desired number of lashes (extension eyelashes). If the glued area is not smooth due to stringiness of the adhesive, adjust it with heated Teflon-coated tweezers shown in 7 in Figure 5(a).

[0036] Depending on the type of eyelashes (thickness, length, shape, color, number, material) used in the eyelash extension procedure, as shown in Figure 4(a) 5, multiple adhesives of the present invention may be used to adhere them. The adhesives may be used anywhere between the three eyelashes and the eyelashes for extension shown in Figure 4(a) 5, or in any position vertically or horizontally.

[0037] Depending on the type (thickness, length, shape, color, number, material) of the extension eyelashes shown in 5 of Figure 4(a) used in the eyelash extension procedure, the adhesive of the present invention may be adhered to the extension eyelashes shown in 5 of Figure 4(a) and then adhered to the person's eyelashes shown in 3 of Figure 4(a).

[0038] The heating tool for softening and melting the adhesive of the present invention may be a hot curler, hair iron, hot hair dryer, hot cutter, soldering iron, glue gun, etc.

[0039] To prevent the person's eyelids from feeling hot or being burned, it is recommended to apply a protective sheet around the eyelids, and then cover the protective sheet with a heat-resistant silicone sheet before removing it. Next, heat approximately 3 cm of the tip of the Teflon-coated tweezers to approximately 90°C using a hot warmer or other device. The Teflon-coated tweezers are then used to hold and melt the person's eyelashes and the extension eyelashes. The adhesive portion of the present invention, a rectangular parallelepiped 0.5 mm thick, 5 mm long, and 1 mm wide viscous material peeled from the A5-sized release sheet, is then heated to soften and melt, allowing it to be removed one by one. After removing each lash, return the Teflon-coated tweezers to the hot warmer or other device and use a spare Teflon-coated tweezers heated to 90°C. Repeat this process until all lashes have been removed.

[0040] If adhesive remains partially on a person's eyelashes, wrap a nonwoven fabric that easily absorbs moisture around a hot curler, heat the curler to 90°C, and stroke the adhesive toward the tip of the eyelashes. This will allow the adhesive to adhere to the nonwoven fabric, which has a higher coefficient of friction than human hair. Example 4: Durability Test Example

[0041] Using the adhesive of this invention (e.g., a rectangular parallelepiped shape measuring 0.5mm thick, 5mm long, and 1mm wide), 50 samples were made by bonding eyelash extensions (approximately 0.15mm thick and 12mm long) to human hair (approximately 0.08mm thick and 9mm long). Water was placed in a beaker and heated to 50°C using a hot water heater. 10g of oil cleansing cosmetics was added and stirred clockwise for 60 minutes. Not a single lash fell off. When the same test was performed with a cyanoacrylate adhesive, 32 fell off, while 18 remained. These results demonstrate that the adhesive of this invention is more resistant than cyanoacrylate adhesives to the "hot water, running water, and ingredients contained in oil cleansing cosmetics" used by people to remove cosmetics such as mascara and foundation.

[0042] Furthermore, 50 samples were made by bonding extension eyelashes (approximately 0.15 mm thick and 12 mm long) and human hair (approximately 0.08 mm thick and 9 mm long) using ethylene vinyl acetate copolymer (EVA) that had not been subjected to the durability test, and when each sample was grasped with tweezers on the left and right (the left eyelash extension and the right human hair) and pulled strongly, 47 human hairs broke and 3 extension eyelashes came off. Furthermore, a similar test was performed on 50 samples bonded using ethylene vinyl acetate copolymer (EVA) that did not contain coloring pigments. Of the 50 samples, only the extension eyelashes came off from the adhesive in 32 of the 50, only the human hair came off in 13 of the remaining 18, and both the extension eyelashes and the human hair came off in the remaining 5.

[0043] The reason why the adhesive of the present invention remained in greater quantity than the cyanoacrylate adhesive in the above test is that the adhesive of the present invention is inherently less likely to absorb moisture and is more flexible and impact resistant than cyanoacrylate adhesives, which harden to the consistency of glass.

[0044] The adhesive of this invention exhibits high peel resistance and durability because the flexible matrix structure of the thermoplastic resin ethylene vinyl acetate copolymer (EVA) conforms to the minute movements of the eyelashes, and the hydrocarbon resin blend improves adhesion and dynamic resistance. Furthermore, unlike conventional cyanoacrylate adhesives, this adhesive retains a certain degree of elasticity even after curing, preventing the adhesive interface from breaking due to impact or friction.

[0045] This invention is a heat-applied adhesive suitable for eyelash extensions that softens and melts in a short time of 1 to 5 seconds at low temperatures, hardens in a short time of 1 to 5 seconds after removal from heat, does not remelt at room temperature, and combines flexibility with high adhesive strength. These properties can only be achieved by optimizing structural elements, including the compounding ratio of thermoplastic resin, hydrocarbon resin, and color pigment, heating conditions, and shape design. [Industrial Applicability]

[0046] The heat-applied adhesive for eyelash extensions of this invention is an adhesive with unprecedented features and can be widely used in the beauty industry for eyelash extension procedures. This invention solves the problems of conventional cyanoacrylate adhesives, such as skin irritation and fall-off, and allows for safer and longer-lasting application, contributing to improved convenience for both the patient and the practitioner. Therefore, this invention is highly practical in the beauty industry and has industrial applicability. [Explanation of symbols]

[0047] 1. Adhesive 1a Adhesive held with tweezers 1b. Human eyelashes with adhesive applied 2 Peel-off sheet 3 people's eyelashes 4 tweezers 5. Eyelash extensions 6 Human Eyelashes, Adhesive and Extension Eyelashes 7. Heated Teflon-coated tweezers 8 fever 9. Second eyelash extension

Claims

1. A heat-applied adhesive used in eyelash extension procedures, which is primarily composed of ethylene vinyl acetate copolymer (EVA) and contains a hydrocarbon resin and a coloring pigment, and which is characterized in that the adhesive softens and melts when heated, hardens when cooled, and does not melt at temperatures below 70°C.

2. A heat-applied adhesive used in eyelash extension procedures, which is mainly composed of a thermoplastic resin and contains a hydrocarbon resin and a coloring pigment, and is characterized by softening and melting at 70 to 120°C.

3. The heat-applied adhesive for eyelash extensions is used in eyelash extension treatments and contains a thermoplastic resin as a main component and a hydrocarbon resin and a coloring pigment, the size of each adhesive being 5 mm square or less, and a plurality of adhesives being arranged in an array on a release sheet so that they can be peeled off one by one for use.

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