Transparent UV-blocking patch

Abstract

Disclosed in the present invention is a transparent UV-blocking patch that is transparently attached to the skin, and effectively blocks ultraviolet rays and can be used for skin care at the same time.

Description

UV protection transparent patch

[0001] Cross-citation with related application(s)

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0044359, filed April 1, 2024, the entire contents of which are incorporated herein by reference.

[0003] The present invention relates to a transparent patch that blocks ultraviolet rays.

[0004] Exposure to UV rays during daily life or prolonged outdoor activities can cause skin redness, and in severe cases, blisters and other burns. Therefore, various cosmetic products, such as sunscreens, sun sprays, and sun sticks, are commercially available to block UV rays. Conventional cosmetic formulations, applied to the skin, are easily removed by sweat or water, requiring repeated reapplication. This can lead to skin irritation, skin problems, and whitening. As an alternative, interest in UV-blocking patches is growing.

[0005] UV protection patches are made by processing UV protection into a film form and attaching it to the skin. They have the advantage of maintaining UV protection for a long time before the film is removed from the skin.

[0006] Most existing UV protection patches feature a hydrogel applied to a flesh-colored fabric, offering the advantage of UV protection along with moisturizing and soothing effects. However, the UV protection agent contained within the hydrogel comes into direct contact with the skin, causing skin irritation. Furthermore, sweat and other factors can easily detach the patch, necessitating a separate adhesive layer. Furthermore, the thicker hydrogel layer increases the thickness and weight of the UV protection patch, causing a foreign body sensation on the skin. Furthermore, the flesh-colored fabric can be visually noticeable.

[0007] To overcome these shortcomings, transparent UV-blocking patches have recently been developed.

[0008] Patent Document 1 discloses a UV-blocking patch comprising a film containing a hydrophobic resin and a UV-blocking agent. The film is transparent, offering excellent visibility. However, it requires an additional layer for adhesion to the skin, which increases the thickness of the UV-blocking patch. Furthermore, this additional layer can also reduce transparency, making transparency control difficult.

[0009] [Prior Art Literature]

[0010] [Patent Document]

[0011] KR Patent Publication No. 10-2020-0053432 (Published on May 18, 2020)

[0012] The present invention has been researched on a transparent UV-blocking patch manufactured as a thin film with excellent adhesion to the skin, while also preventing direct contact of the UV-blocking agent with the skin. As a result, a UV-blocking film was manufactured by impregnating a cosmetic composition into a breathable nanofiber web, but incorporating the UV-blocking agent into the nanofiber web itself, rather than the cosmetic composition.

[0013] The purpose of the present invention is to provide a transparent patch that blocks ultraviolet rays.

[0014] The present invention provides a UV-blocking transparent patch in which a UV-blocking film is formed on a substrate sheet, and the UV-blocking film is a nanofiber web made of a plurality of nanofibers including a UV-blocking agent and a polymer resin, and a cosmetic composition is impregnated therein.

[0015] The UV-blocking transparent patch of the present invention is thin and transparent, so it does not cause any foreign body sensation when applied to the skin. It effectively blocks UV rays and simultaneously provides skin care. Furthermore, it adheres lightly to the skin, allows for the application of makeup, and its excellent breathability helps maintain a comfortable environment.

[0016] Fig. 1 is a cross-sectional view showing the laminated structure of a UV-blocking transparent patch according to the present invention.

[0017] Figure 2 is a perspective view showing the laminated structure of a UV-blocking transparent patch according to one embodiment.

[0018] Figure 3 is a photograph showing (a) a nanofiber web and (b) a UV-blocking film manufactured in Example 1.

[0019] According to one embodiment of the present invention, a UV-blocking film is formed on a substrate sheet, and the UV-blocking film comprises a UV-blocking agent and a polymer resin, and a nanofiber web formed of a plurality of nanofibers is impregnated with a cosmetic composition, thereby providing a UV-blocking transparent patch.

[0020] The present invention will be described with reference to the drawings below.

[0021] The ultraviolet ray blocking transparent patch (10) of the present invention includes a base sheet (1) and an ultraviolet ray blocking film (3) formed on the base sheet (1).

[0022] The substrate sheet (1) may be a porous member for supporting the ultraviolet ray blocking film (3), and may be, for example, a nonwoven fabric, woven fabric, knitted fabric or film including natural materials such as cotton or silk, synthetic materials such as polyethylene, polypropylene, polyester, elastomer, polyurethane, biocellulose, etc.

[0023] Nonwoven fabrics are fabrics that do not have longitudinal and transverse directionality in their fibers. They may be dry-processed nonwoven fabrics such as chemical bonding nonwoven fabrics, thermal bonding nonwoven fabrics, and air-lay nonwoven fabrics, or known nonwoven fabrics manufactured by various methods such as wet-processed nonwoven fabrics, spandex nonwoven fabrics, needle-punched nonwoven fabrics, or melt-blown fabrics, but are not limited thereto. Woven fabrics refer to fabrics in which fibers contained in the fabric have longitudinal and transverse directionality, and specific structures may be plain weaves, twill weaves, etc., and the densities of warp and weft yarns are not particularly limited. In addition, the knitted fabric may be a known knit structure, and may be a weft knit fabric, a warp knit fabric, etc., and for example, may be a tricot in which yarns are warp-knitted. In addition, the film may be processed into a thin film.

[0024] The ultraviolet ray blocking film (3) of the present invention has a structure in which a cosmetic composition is impregnated into a nanofiber web composed of a plurality of nanofibers, including an ultraviolet ray blocking agent and a polymer resin.

[0025] The nanofiber web of the present invention refers to a sheet in which nanofibers having an average diameter of 50 nm to 1000 nm, preferably 100 nm to 800 nm, form a porous three-dimensional structure.

[0026] The UV-blocking film (3) of the present invention is manufactured with nanofibers containing a UV-blocking agent, thereby containing a higher content of UV-blocking agent than conventional UV-blocking films, thereby ensuring UV-blocking effects for a long period of time. Furthermore, by manufacturing the film so that the UV-blocking agent is incorporated into the nanofibers, it can effectively prevent skin problems caused by direct contact between the UV-blocking agent and the skin.

[0027] Specifically, the sunscreen may be included in an amount of 100 to 150 parts by weight, preferably 100 to 130 parts by weight, relative to 100 parts by weight of the polymer resin. The sunscreen may be used in a high amount of 1:1 or more by weight relative to the polymer resin, thereby maximizing the sunscreen effect.

[0028] The UV-blocking film (3) of the present invention is manufactured to a very thin thickness that adheres closely to the skin without causing a foreign body sensation (thickness). It also has excellent flexibility, providing excellent adhesion to curved skin. Accordingly, it adheres thinly to the skin and, after attachment, does not easily detach even during sweat or exercise, and maintains excellent adhesion even underwater.

[0029] The nanofiber web in a dry state may have a thickness of 3 µm to 20 µm, preferably 4 µm to 20 µm, or 5 µm to 18 µm. If the thickness is less than the above range, it may be difficult to incorporate a sufficient amount of UV blocking agent, which may result in a reduction in UV blocking performance. Conversely, if the thickness exceeds the above range, flexibility may be reduced, making it difficult to adhere to the skin or may easily fall off, and a foreign body sensation may be felt.

[0030] The amount of impregnation of the cosmetic composition varies depending on the basis weight of the nanofiber web, but the nanofiber web impregnates the cosmetic composition at 5 g / m 2 100 g / m 2 , preferably 10 g / m 2 60 g / m 2It is impregnated with an amount of . The above cosmetic composition contains an effective ingredient for skin activation and must maintain a wet state until the UV-blocking film (3) is attached to the skin and removed. Therefore, if the content is below the above range, the wet state cannot be maintained, and the UV-blocking film (3) may increase in opacity or be removed from the skin. On the other hand, if the cosmetic composition is used excessively, the UV-blocking film (3) may be removed from the skin due to the cosmetic composition remaining on the surface of the nanofiber web, etc. after being impregnated into the nanofiber web.

[0031] The amount of the above cosmetic composition impregnated is related to the basis weight and air permeability of the nanofiber web.

[0032] The nanofiber web of the present invention has a basis weight of 1 g / m 2 20 g / m 2 , preferably 2 g / m 2 15 g / m 2 It can be. If the above thickness is satisfied but the basis weight is less than the above range, the pores of the nanofiber web may be formed too large during use, so that the cosmetic composition may not be impregnated and leakage may occur. Conversely, if the above thickness is satisfied but the basis weight exceeds the above range, the pores of the nanofiber web may be formed too small, so that the content of the cosmetic composition to be impregnated may be reduced.

[0033] The nanofiber web of the present invention has an air permeability of 0.5 to 20 CFM (125 Pa), preferably 1 to 8 CFM (125 Pa). If the above thickness is satisfied, but the air permeability is below the above range, the porosity formed in the nanofiber web is too low, making it difficult to sufficiently impregnate the cosmetic composition. Conversely, if the above range is exceeded, the porosity formed in the nanofiber web is too high, preventing the cosmetic composition from being impregnated and causing leakage.

[0034] The UV-blocking film (3) impregnated with the cosmetic composition is in a wet state, and the thickness, basis weight, and air permeability are different from those of the nanofiber web in a dry state due to the cosmetic composition. Specifically, the UV-blocking film (3) has a thickness of 3.1 ㎛ to 26 ㎛, preferably 4.1 ㎛ to 21 ㎛, and a basis weight of 3 g / m. 2 40 g / m 2 , preferably 5 g / m 2 30 g / m 2 , and the air permeability is 0.01 to 4 CFM (2500Pa), preferably 0.04 to 3 CFM (2500Pa). Each of the above properties varies depending on the amount of impregnation of the cosmetic composition.

[0035] When the thickness, basis weight, air permeability, and impregnation amount of the above nanofiber web are appropriately controlled, a comfortable feeling of use can be provided when the UV-blocking film (3) is attached to the skin.

[0036] In addition, the ultraviolet ray blocking film (3) of the present invention is transparent, so that no foreign body sensation is felt after being attached to the skin, the user's skin tone is maintained as is, and color makeup can be applied after the ultraviolet ray blocking film (3) is attached.

[0037] The nanofiber web is opaque in a dry state, and when impregnated with a cosmetic composition, it becomes transparent, and as a result, the UV-blocking film (3) remains transparent. Specifically, the UV-blocking film (3) has a light transmittance of 50% or more, 55% or more, 60% or more, 65% or more, 70% or more, or 75% or more in the visible light range, and the visibility of the adhered portion does not decrease after being attached to the skin. As a result, the user's skin tone can be maintained as is when the UV-blocking film (3) is attached.

[0038] Compared to existing UV-blocking patches that apply a separate essence after attaching the UV-blocking patch, the UV-blocking film (3) of the present invention maintains transparency itself and has a structure in which a cosmetic composition is impregnated, thereby increasing convenience in use.

[0039] That is, the ultraviolet ray blocking transparent patch of the present invention does not have an additional layer for skin attachment other than the ultraviolet ray blocking film, thereby preventing the thickness of the ultraviolet ray patch from increasing and preventing the transparency from decreasing.

[0040] The ultraviolet ray blocking agent that can be used in the ultraviolet ray blocking film (3) of the present invention is not particularly limited, and known organic ultraviolet ray blocking agents and inorganic ultraviolet ray blocking agents can be used.

[0041] The organic sunscreen may be at least one selected from the group consisting of oxybenzone, avobenzone, ethylhexyl methoxycinnamate, isoamyl-p-methoxycinnamate, ethylhexyl salicylate, bisethylhexyloxyphenol methoxyphenyl triazine, diethylaminohydroxybenzoyl hexyl benzoate, octyl methoxycinnamate, octocrylene, homosalate, octyltriazone, ethylhexyl triazone, menthyl anthranilate, phenylbenzimidazole sulfonic acid, and 3,4-methylbenzylidene camphor.

[0042] The inorganic UV blocker may be at least one selected from the group consisting of titanium dioxide, zinc oxide, iron oxide, zirconium oxide, silicon dioxide, manganese oxide, aluminum oxide, cerium oxide, and mica.

[0043] Sunscreens can be used as organic sunscreens, inorganic sunscreens, or as a composite of both.

[0044] Meanwhile, the polymer resin usable in the UV-blocking film (3) of the present invention may be a hydrophobic resin. If it is a hydrophilic resin, the shape of the nanofiber web may be deformed or damaged by the cosmetic composition to be impregnated. The hydrophobic resin may be at least one selected from the group consisting of polyvinylidene fluoride (PVDF), polyurethane, polyacrylonitrile, nylon, polyethersulfone, polyetherimide, polycaprolactone, polylactic acid (PLA), polylactic acid glycolic acid (PLGA), polyhydroxybutyrate, polypropylene, polystyrene, polybutylene terephthalate, polyethylene naphthalate, polyvinyl butyral, polyvinylacetate, and polycarbonate, and preferably polyvinylidene fluoride, polyurethane, etc.

[0045] The cosmetic composition of the present invention is not particularly limited, and is an aqueous composition. Known skin-active ingredients, natural extracts, etc. having effects such as skin moisturizing, wrinkle improvement, skin whitening, UV protection, anti-aging, hydration, elasticity increase, and skin soothing can be used. However, to facilitate impregnation into the nanofiber web, it is preferable to use a high-viscosity formulation having a viscosity of 5,000 to 200,000 cps. When a high-viscosity formulation is used, the cosmetic composition does not flow out of the nanofiber web during distribution or use of the UV-blocking transparent patch, thereby enhancing convenience in use.

[0046] Effective skin ingredients for skin whitening may include arbutin, ethyl ascorbyl ether, licorice extract, ascorbyl glucoside, paper mulberry extract, magnesium ascorbyl phosphate, niacinamide, alpha-bisabolol, glutathione, ascorbyl tetraisopalmitate, nicotine phlorin, nevatalactone, phlorotannins, catechin, fucosterol, lutein, lycopene, fibroin, sericin, curcumin, ginsenoside, ellagic acid, and vitamins.

[0047] Effective skin ingredients for improving wrinkles may include retinol, retinyl palmitate, adenosine, polyethoxylated retinamide, coumarin, borpinin, collagen, elastin, keratin, ergosterol, saponins, chondroitin, trehalose, etc.

[0048] Effective skin ingredients for improving the skin barrier may include ceramide, betulinic acid, chlorogenic acid, and caffeic acid.

[0049] Effective skin ingredients for relieving acne-prone skin may include salicylic acid.

[0050] Compositions known in the art can be used together with the above skin effective ingredients.

[0051] Meanwhile, the nanofiber web used in the ultraviolet ray blocking film (3) of the present invention is opaque in a dry state, but becomes transparent when the nanofiber web is impregnated with a cosmetic composition. The transparency can be achieved through the use of a solubilizing agent.

[0052] In particular, in the present invention, the transparency of the ultraviolet ray blocking film (3) changes immediately from the moment the cosmetic composition comes into contact with the nanofiber web.

[0053] A solubilizer is a substance that makes water-insoluble substances transparent, and is used to convert an opaque nanofiber web into a transparent state. The solubilizer may be used in at least one of the nanofiber web and / or the cosmetic composition. Preferably, when manufactured by including the solubilizer in the nanofiber web, the solubilizer can be evenly dispersed throughout the nanofiber web, thereby maintaining uniform transparency throughout the entire UV-blocking film (3).

[0054] The available solubilizing agent may be a fluorinated surfactant.

[0055] Fluorinated surfactants refer to hydrocarbon surfactants containing a perfluoroalkyl group in the main chain or side chain of a compound containing hydrophilic and hydrophobic groups. In particular, those in which all hydrogens bonded to carbons in the hydrophobic group are replaced with fluorine are more preferably used.

[0056] Examples of the above fluorinated surfactants include anionic fluorinated surfactants including perfluoroalkyl carboxylates, perfluoroalkyl sulfates, and perfluoroalkyl phosphates; cationic fluorinated surfactants including perfluoroalkyl amine salts and perfluoroalkyl quaternary ammonium salts; zwitterionic fluorinated surfactants including perfluoroalkyl carboxybetaines and perfluoroalkyl sulfobetaines; and nonionic fluorinated surfactants such as perfluoroalkyl polyoxyethylenes and fluorinated alkyl esters, and these may be used alone or in combination of two or more. In particular, among these, fluorinated carbon compounds composed of nonionic perfluoroalkyl polyoxyethylenes and perfluoroalkyl esters can be preferably used. In the above, 'perfluoroalkyl' means a C1-C10 straight-chain or branched-chain alkyl group in which all hydrogens bonded to carbon atoms are replaced with fluorine.

[0057] The content of the solubilizer is adjusted to a level that can uniformly achieve transparency across the entire UV-blocking film (3). To ensure that the UV-blocking film (3) has a light transmittance of 50% or more, the solubilizer is used in an amount of 3 to 40 parts by weight, preferably 6 to 30 parts by weight, per 100 parts by weight of the polymer resin. Excessive use of the solubilizer reduces stability during the spinning process for producing a nanofiber web, making it difficult to produce nanofibers with a uniform diameter.

[0058] Meanwhile, the heteromorphic film (5) of the present invention is positioned on one side of the base sheet (1) on which the ultraviolet ray blocking film (3) is not formed, and prevents contamination and evaporation of the cosmetic composition impregnated in the ultraviolet ray blocking transparent patch (10) until it is attached to the skin.

[0059] The material of the above-mentioned release film (5) is not particularly limited, and any material known in the art to be usable as a release film can be used without limitation. In particular, PET film, embossed PET film, PP film, etc. are preferred.

[0060] The cover sheet (7) of the present invention is positioned on the ultraviolet ray blocking film (3) and is used to protect the ultraviolet ray blocking film (3) until it is attached to the skin. The cover sheet (7) may be made of the same material as the base sheet (1) or may be made of the material mentioned in the base sheet (1).

[0061] If necessary, the cover sheet (7) may have a waterproof function to prevent the cosmetic composition from being impregnated or absorbed, and may be surface-treated to prevent external foreign matter water droplets from penetrating.

[0062] The above-mentioned heteromorphic film (5) and cover sheet (7) have a handle formed on one side to enable easy removal when using the UV-blocking transparent patch (10).

[0063] The UV-blocking transparent patch (10) of the present invention can be cut into a shape suitable for attachment to the skin. It can be provided in a shape suitable for attachment to the face, for example, in the form of an under-eye protection patch.

[0064] Figure 2 is a perspective view showing a UV-blocking transparent patch (10) according to one embodiment of the present invention.

[0065] As shown in Fig. 2, the UV-blocking transparent patch has a structure in which a release film (5), a substrate sheet (1), a UV-blocking film (3), and a cover sheet (7) are laminated in that order from the bottom.

[0066] The substrate sheet (1) and the UV-blocking film (3) are manufactured in the same size and shape, and the release film (5) and the cover sheet (7) are manufactured in the same shape as the substrate sheet (1) and the UV-blocking film (3) to protect them, but in a slightly larger size.

[0067] When in use, separate the release film (5) and cover sheet (7) using the handles (51, 71), attach the base sheet (1) and the UV-blocking film (3) so that the UV-blocking film (3) is in contact with the skin, and then separate the base sheet (1) so that only the UV-blocking film (3) is attached to the skin. If necessary, straighten the UV-blocking film (3) so that it can be attached according to the curves of the skin.

[0068] The UV-blocking transparent patch (10) according to the present invention is produced by the steps of: laminating a nanofiber web on a base sheet (1); impregnating the nanofiber web with a cosmetic composition; and laminating it with a cover sheet (7) and a release film (5).

[0069] Nanofiber webs are manufactured using an electrospinning process. Electrospinning refers to a process for manufacturing nanofiber webs using a jet of electrically charged polymer solutions and melts.

[0070] The radiation solution contains a UV blocker, a polymer resin, a solubilizer for transparency, additives, and a solvent. Each composition is as mentioned above.

[0071] The spinning solution is prepared at a concentration of 20 to 60 wt%. For the above concentration, solvents such as dimethylformamide, dimethylacetamide, methyl ethyl ketone, tetrahydrofuran, acetone, chloroform, dimethyl sulfoxide, dichloromethane, alcohol, acetic acid, formic acid, N-methylpyrrolidone, and water can be used. The solvent may vary depending on the type of polymer resin used, and may be used alone or in combination of two or more.

[0072] Electrospinning is preferably performed at a voltage of 10–55 kV and a spacing of 2–10 cm. Electrospinning voltages below 10 kV can hinder the formation of nanofibers with uniform particle sizes, while voltages exceeding 55 kV can result in excessive energy consumption without any further effects. Furthermore, an electrospinning spacing of less than 2 cm may result in poor nanofiber web properties, while spacings exceeding 10 cm may not ensure uniform thickness.

[0073] The nanofiber web manufactured after electrospinning is fixed by methods such as pressing, rolling, thermal bonding, and ultrasonic bonding to manufacture the nanofiber web in the form of a porous film, and at this time, physical properties such as thickness, basis weight, and air permeability are controlled.

[0074] First, a nanofiber web is laminated on a substrate sheet (1), and then a cosmetic composition is impregnated into the nanofiber web to manufacture a UV-blocking film (3).

[0075] At this time, the impregnation method is not particularly limited in the present invention, and for example, methods such as comma coating, reverse coating, slot die coating, spray coating, and doctor blade can be used.

[0076] Next, a cover sheet (7) and a release film (5) are laminated on each side of the substrate sheet (1) and the UV-blocking film (3) to manufacture a UV-blocking transparent patch.

[0077] [Example]

[0078] Hereinafter, the present invention will be described in more detail through examples. These examples are intended to explain the present invention more specifically, and the scope of the present invention is not limited to these examples.

[0079] [Examples 1-7]

[0080] (1) Manufacturing of nanofiber web

[0081] A nanofiber web was manufactured using the composition shown in Table 1 below. A spinning solution was manufactured by adding a polymer resin, solvent, UV blocker, and solubilizer to a mixer. The obtained spinning solution was transferred to a spinning pack and electrospinning was performed under the conditions of an applied voltage of 35 kV, a distance between the spinning nozzle and the collector of 20 cm, an output of 0.55 cc / g / hole per minute, a temperature of 25°C, and a relative humidity of 40% to manufacture a web-shaped substrate. Then, heat treatment was performed in a hot air furnace at 60°C for 30 minutes to remove the residual solvent, thereby manufacturing a nanofiber web. At this time, PFEO (perfluoroalkylpolyoxyethylene, nonionic) and PFAC (perfluorobutylcarboxylate, anionic) were used as solubilizers.

[0082] (2) Cosmetic composition for skin whitening

[0083] A skin whitening composition was prepared by mixing arbutin, ethyl ascorbyl ether, soluble licorice extract, ascorbyl glucoside, mulberry extract, magnesium ascorbyl phosphate, niacinamide, alpha-bisabolol, glutathione, ascorbyl tetraisopalmitate, nicotine phlorin, nevatalactone, phlorotannin, catechin fucosterol, lutein, lycopene, fibroin, sericin, curcumin, ginsenoside, ellagic acid, and vitamins in a mixer.

[0084] (3) UV blocking film

[0085] The cosmetic composition is gravure coated on the surface of the nanofiber web so that the impregnation amount is 40 g / m 2 A UV-blocking film was manufactured.

[0086] (4) Evaluation

[0087] The physical properties of the nanofiber web and UV-blocking film manufactured above were measured, and the results are shown in the table below.

[0088] [Analysis Method]

[0089] - Diameter: The diameter of the fibers was visually determined in scanning electron microscope images, and the number of nanofibers with a certain diameter within a certain group was counted to measure the diameter distribution.

[0090] - Thickness: The thickness was measured using the thickness measurement method specified in KS K 0506 or ISO 4593 and ISO 9073-2.

[0091] - Weight: Measured using ASTM D 3776.

[0092] - Air permeability: Measured under the conditions of an area of ​​38 ㎠ and a static pressure of 125 Pa using the ASTM D 737 method. At this time, ㎤ / ㎠ / s was converted to ft3 / ft2 / min (CFM).

[0093] - UV Protection Factor: The UV protection factor (SPF) and UVA protection factor (PFA) of UV-blocking patches were measured according to the UV-blocking functionality test method in the "Functional Cosmetics Standards and Test Methods" announced by the Ministry of Food and Drug Safety. The UV-blocking patches were attached to Transpore tape, left on for 15 minutes, and then measured using an SPF 290 analyzer. The UV-blocking factor was calculated as the average of three tests.

[0094] - UV-A, UV-B transmittance: Using a UV-visible spectrophotometer (Shimadzu UV-VIS spectrophotometer 1240), the ultraviolet protection factor (UPF), UV-A transmittance (315-400 nm), and UV-B transmittance (290-315 nm) were measured at a wavelength interval of 5 nm.

[0095] - Visible light transmittance: The transmittance at 550 nm was measured using a UV-Visible spectrophotometer (Shimadzu UV-VIS spectrophotometer 1240).

[0096] Composition (weight part) Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Polymer resin PVDF 100 100-100 100 100 100 PU-100 ---- UV blocker Oxybenzone 120 120 120 80 80 40 Titanium dioxide -- 40 120-120 Solubilizer PFEO 8-88 --- PFAC-8 -- 88 8 Solvent DMF 300 300 300 300 300 300 Nanofiber web Nanofiber diameter 520 nm 500 nm 480 nm 510 nm 530 nm 470 nm 530 nm Thickness 10 ㎛ 10 ㎛ 10 ㎛ 10 ㎛ 10 ㎛ 10 ㎛ 13 ㎛ Basis weight (g / m 2 )5.55.55.55.55.55.45.6 Breathability CFM (125Pa)2.52.52.52.62.72.62.2 UV blocking film thickness12㎛12㎛12㎛12㎛12㎛11㎛13㎛Basis weight (g / m 2 )12121212121015 Breathability CFM (2500Pa)0.10.20.20.080.30.20.3 UV protection factor 50 or more 50 or more 50 or more 50 or more 50 or more Less than 50 or more UV-A transmittance (%) 2.22.32.32.32.02.51.9 UV-B transmittance (%) 0.20.20.20.20.10.30.1 Visible light transmittance (%) 75% 72% 73% 71% 69% 49% 45%

[0097] As shown in the table above, the nanofiber web is composed of nanofibers with a diameter of approximately 500 nm, and the thickness and air permeability of the UV-blocking film slightly increased after the cosmetic composition was impregnated.

[0098] It can be seen that the UV-blocking films manufactured in Examples 1 to 5 have a high transparency of at least 69%. In addition, it can be seen that the UV-blocking index and visible light transmittance change depending on the content of the UV-blocking agent of Examples 6 and 7.

[0099] In addition, among the fluorinated surfactants, the use of the nonionic fluorinated surfactant of Example 1 showed improved results compared to the use of the anionic fluorinated surfactant of Example 2.

[0100] Figure 3 is a photograph showing (a) a nanofiber web and (b) a UV-blocking film manufactured in Example 1. As can be seen from Figure 3, the nanofiber web has a white, opaque film shape, and the UV-blocking film has a transparency sufficient to allow the back of the hand to be seen.

[0101] [Example 1]

[0102] The transparency of UV-blocking films was measured according to the type and content of the solubilizing agent.

[0103] A UV-blocking film was manufactured in the same manner as in Example 1, but using different types of solubilizers as shown in Table 2 below.

[0104] Solubilizer type PFEOPFAC Polysorbate 20 Polysorbate 80 PEG 60 Hydrogenated Castor Oil Visible Light Transmittance (%) Nanofiber Web 0.7 0.8 0.3 0.3 0.4 UV Blocking Film 75% 72% 35% 37% 40%

[0105] As shown in the table above, all manufactured nanofiber webs exhibited opaque characteristics. However, when manufactured into UV-blocking films by impregnating them with cosmetic compositions, all exhibited a tendency for increased transparency.

[0106] In particular, it can be seen that the transparency of the UV-blocking film varies depending on the type of solubilizing agent, and when the fluorinated surfactant according to the present invention is used, high transparency can be achieved.

[0107] In addition to the type of solubilizer, the content of the solubilizer also affects the transparency of the UV-blocking film. Therefore, UV-blocking films were manufactured using the same method as Example 1, varying the content of the solubilizer. Visible light transmittance was measured, and the results are shown in the table below.

[0108] Solubilizer content 2 parts by weight 4 parts by weight 8 parts by weight 16 parts by weight 32 parts by weight 45 parts by weight Visible light transmittance (%) Nanofiber web 0.5 0.7 0.7 0.8 0.6 Not measurable UV blocking film 48% 62% 75% 81% 84% Not measurable

[0109] The table above shows that the nanofiber web exhibits opacity, and its transparency increases with the addition of the cosmetic composition. Specifically, as the content of the solubilizer increased, the transparency of the UV-blocking film also tended to increase. However, when using 45 parts by weight of solubilizer, the nanofiber web could not be manufactured due to low radiation stability.

[0110] [Example 2]

[0111] The same procedure as Example 1 was followed, but three nanofiber webs were produced as follows.

[0112] Nanofiber web A: thickness 10㎛, basis weight 5.5 g / m 2

[0113] Nanofiber web B: thickness 22㎛, basis weight 1.1 g / m 2

[0114] Nanofiber web C: thickness 55㎛, basis weight 34.7 g / m 2

[0115] Each of the above nanofiber webs was impregnated with the cosmetic composition of Example 1 to produce a UV-blocking film, which was then attached to the face and back of the hand for 8 hours to evaluate transparency, adhesion, and breathability. The evaluation criteria are as follows.

[0116] (1) Transparency

[0117] ◎: High transparency

[0118] ○: Transparent

[0119] △: Slightly low transparency

[0120] X: Opaque

[0121] (2) Maintain transparency

[0122] ◎: Transparency remains high even after 8 hours

[0123] ○: Maintain transparency

[0124] △: Slight decrease in transparency

[0125] X: Some opaque areas occur

[0126] (3) Adhesion

[0127] ◎: High adhesion

[0128] ○: Adhesive

[0129] △: Slightly low adhesion

[0130] X: Easily peeled off

[0131] (4) Attachment persistence

[0132] ◎: High adhesion persistence even after 8 hours

[0133] ○: Has long-lasting attachment

[0134] △: Drying at both ends

[0135] X: Easily peeled off

[0136] (5) Breathability

[0137] ◎: Highly breathable

[0138] ○: Breathable

[0139] △: Slightly less breathable

[0140] X: Feeling stuffy

[0141] Cosmetic composition impregnation amount transparency transparency retention adhesiveness adhesion persistence breathability nanofiber web A10 g / m 2 ○△○△○40 g / m 2 ◎◎◎◎◎60 g / m 2 ◎◎○△○Nano fiber web B10 g / m 2 △Х○Х○40 g / m 2 ◎◎○△Х60 g / m 2 -----Nano fiber web C10 g / m 2 △Х○Х◎40 g / m 2 ◎◎○△○60 g / m2 ◎○△△Х

[0142] As shown in the table above, the UV-blocking film using nanofiber web A with an appropriate thickness and basis weight had excellent transparency, adhesion, and breathability. However, when the cosmetic composition was used at 60 g / m 2 When the cosmetic composition was impregnated in excess, the transparency was excellent, but a slipping phenomenon occurred when attached to the skin. In comparison, the UV-blocking film using nanofiber web B, which was manufactured very thinly, had a low basis weight, so the amount of cosmetic composition impregnated could not help but be low, and as a result, the transparency decreased over time. When the cosmetic composition was impregnated in an amount of 60 g / m 2 If the UV blocking film was excessively impregnated, it was inconvenient to use as it would stick together or slip, and it was difficult to attach to the skin, making measurement impossible.

[0143] Furthermore, UV-blocking films using nanofiber web C, manufactured thickly and with high basis weight, exhibited reduced transparency when impregnated with a small amount of cosmetic composition, and stiffened over time, resulting in poor adhesion. Furthermore, while high impregnation yielded high transparency and skin adhesion, breathability was also reduced.

[0144] Consequently, various characteristics of UV-blocking films are related to the thickness and basis weight of the nanofiber web and the amount of cosmetic composition impregnated into it. Therefore, through appropriate adjustment of these factors, a UV-blocking film with optimized properties can be manufactured.

[0145] In addition, it was found that the nanofiber web impregnated with the cosmetic composition, which is a UV-blocking film according to the present invention, is attached to the skin alone and there is no additional layer for attachment, thereby preventing the thickness of the UV patch from increasing and preventing the transparency from decreasing.

[0146] Description of the symbol

[0147] 1: Description sheet

[0148] 3: UV protection film

[0149] 5: Heteromorphic film

[0150] 7: Cover sheet

[0151] 10: UV protection transparent patch

[0152] 51, 71: Handle

[0153] The present invention can be applied to a UV-blocking transparent patch.

Claims

1. A UV-blocking film is formed on the substrate sheet, The above UV-blocking film is a UV-blocking transparent patch in which a cosmetic composition is impregnated into a nanofiber web composed of a plurality of nanofibers, including a UV-blocking agent and a polymer resin.

2. In paragraph 1, The above UV-blocking film is a UV-blocking transparent patch having a light transmittance of 50% or more in the visible light range.

3. In paragraph 1, The above UV-blocking film has a thickness of 3.1 ㎛ to 26 ㎛ and a basis weight of 3 g / m 2 40 g / m 2 , a UV-blocking transparent patch having a breathability of 0.01 to 4 CFM (2500Pa).

4. In paragraph 1, The above nanofiber is a UV-blocking transparent patch having an average diameter of 50 nm to 1000 nm.

5. In paragraph 1, The above nanofiber web has a thickness of 3 to 20 μm and a basis weight of 1 to 20 g / m. 2 , a UV-blocking transparent patch having a breathability of 0.5 to 20 CFM (125Pa).

6. In paragraph 1, The above nanofiber web is a UV-blocking transparent patch containing 100 to 150 parts by weight of a UV blocking agent per 100 parts by weight of a polymer resin.

7. In paragraph 1, A UV-blocking transparent patch comprising at least one selected from the group consisting of organic UV-blockers including oxybenzone, avobenzone, ethylhexyl methoxycinnamate, isoamyl-P-methoxycinnamate, ethylhexyl salicylate, bis-ethylhexyloxyphenol methoxyphenyl triazine, diethylaminohydroxybenzoyl hexyl benzoate, octyl methoxycinnamate, octocrylene, homosalate, octyltriazone, ethylhexyl triazone, menthyl anthranilate, phenylbenzimidazole sulfonic acid, and 3,4-methylbenzylidene camphor; and inorganic UV-blockers including titanium dioxide, zinc oxide, iron oxide, zirconium oxide, silicon dioxide, manganese oxide, aluminum oxide, cerium oxide, and mica.

8. In paragraph 1, The above polymer resin is at least one selected from the group consisting of polyvinylidene fluoride, polyurethane, polyacrylonitrile, nylon, polyethersulfone, polyetherimide, polycaprolactone, polylactic acid, polylactic acid glycolic acid, polyhydroxybutyrate, polypropylene, polystyrene, polybutylene terephthalate, polyethylene naphthalate, polyvinyl butyral, polyvinylacetate, and polycarbonate, a UV-blocking transparent patch.

9. In paragraph 1, A UV-blocking transparent patch having a cover sheet formed on the above UV-blocking film.

10. In paragraph 1, A UV-blocking transparent patch having a release film on a substrate sheet on which the above UV-blocking film is not formed.

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