Skin Patches and Methods for Using Skin Patches

Abstract

SUMMARY OF THE DERMATOLOGY The present invention relates to a skin patch and a method of using a skin patch. The present invention includes a base sheet and a film disposed on the base sheet, the film being reduced in thickness by an activator.

Description

[Technical Field]

[0001] The present invention relates to a patch that adheres to the skin and a method for using the patch. [Background technology]

[0002] Skin patches are generally used for beauty purposes such as UV protection and moisturizing. They are made by impregnating ordinary nonwoven fabric with various essences or other preparations and attaching them to the skin, or by attaching them to the skin in a hydrogel state.

[0003] Gel-type patches using materials such as agar seaweed and starch are also used as skin patches. However, when ordinary nonwoven fabric is impregnated with various essences and other preparations and applied to the skin of the face, etc., as described above, a large amount of the preparation evaporates into the air, causing the patch to dry out completely within 15 to 20 minutes, resulting in a deterioration in adhesiveness and causing the patch to fall off the skin or causing problems such as a deterioration in the transdermal absorption of the preparation.

[0004] Furthermore, in the case of hydrogel-type patches, adhesion to the skin is reduced, and the adhesive formulation that provides adhesion often causes chemical skin troubles. Also, the product can be produced using only limited formulations, and the manufacturing process is complicated and requires a long time for aging, etc., which increases the manufacturing cost.

[0005] Furthermore, in the case of gel-type patches using agar seaweed or starch, mesh or the like is used as a support for the gel, and the support cannot completely support the gel, so the gel may lose its shape or be damaged while it is attached to the user's skin. After drying, the residue turns into powder, making it difficult to maintain cleanliness.

[0006] Recently, as leisure industries such as golf, mountain climbing and hiking have become more active, there has been a demand for patches that can be used not only indoors but also outdoors. Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention aims to provide a skin patch having high skin adhesion and transparency, and a method for using the same, but these objectives are merely examples and are not intended to limit the scope of the present invention. [Means for solving the problem]

[0008] One aspect of the present invention provides a skin patch that includes a base sheet and a film disposed on the base, the film having a reduced thickness due to an active substance. [Effects of the Invention]

[0009] The skin patch and its method of use according to one embodiment of the present invention can improve adhesion to the area to which it is attached, improving the comfort of use. The skin patch has a reduced film thickness and improved softness. The softer film eliminates gaps between the skin surface and the film, improving adhesion.

[0010] The skin patch and its method of use according to one embodiment of the present invention can improve the transparency of the film in the area where it is attached, thereby improving the cosmetic effect and increasing comfort when attached. The skin patch has a reduced film thickness and improved transparency. The skin can be clearly seen through the transparent area, increasing user satisfaction.

[0011] The skin patch and its method of use according to one embodiment of the present invention can improve functionality. The active ingredient delivered to the skin is contained in the portion that comes into contact with the skin, so it can enhance cosmetic effects without causing skin trouble. Furthermore, the film containing the UV-blocking material can have high waterproofing properties, waterproof retention, and high UV-blocking properties. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 shows a skin patch according to one embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1 and an enlarged view. [Figure 3] FIG. 3 is an enlarged view showing a modification of FIG. [Figure 4] 4 to 9 are diagrams showing how to use the skin patch of FIG. [Figure 5] 4 to 9 are diagrams showing how to use the skin patch of FIG. [Figure 6] 4 to 9 are diagrams showing how to use the skin patch of FIG. [Figure 7] 4 to 9 are diagrams showing how to use the skin patch of FIG. [Figure 8] 4 to 9 are diagrams showing how to use the skin patch of FIG. [Figure 9] 4 to 9 are diagrams showing how to use the skin patch of FIG. [Figure 10] 10 and 11 are flow charts illustrating a method of using the skin patch of FIG. [Figure 11] 10 and 11 are flow charts illustrating a method of using the skin patch of FIG. [Figure 12] 12 and 13 are graphs showing the UV blocking effect of the skin patch of FIG. [Figure 13] 12 and 13 are graphs showing the UV blocking effect of the skin patch of FIG. [Figure 14] FIG. 14 is a photograph showing the skin patch of FIG. 1 in use. DETAILED DESCRIPTION OF THE INVENTION

[0013] One aspect of the present invention provides a skin patch that includes a base sheet and a film disposed on the base sheet, the film having a reduced thickness due to an activator.

[0014] Additionally, the film can become more transparent when activated by the activator.

[0015] Additionally, the active agent may be sprayed onto the film, painted onto the film, or secreted through the skin to which the film is applied.

[0016] Furthermore, the film can become more flexible upon activation.

[0017] The activator can also dissolve the film.

[0018] Additionally, the film may include a first layer adjacent to the base sheet and a second layer disposed on one side of the first layer and including an active ingredient to be delivered to the skin.

[0019] In addition, an intermediate layer having a lower adhesive strength than the second layer may be disposed between the first layer and the base sheet.

[0020] The intermediate layer can also be contacted with a solution to reduce the adhesive strength.

[0021] Another aspect of the present invention provides a method for using a skin patch having a base sheet and a film, the method comprising the steps of attaching the film to the skin and thinning the thickness of the film with an activating substance.

[0022] The step of attaching the film may also include a step of allowing the base sheet to absorb a solution, thereby reducing the adhesive strength between the base sheet and the film, a step of attaching the base sheet and the film to the skin, and a step of separating the base sheet from the film.

[0023] The step of thinning the film may also include thinning the film when the activator contacts the film.

[0024] Additionally, the film thinning process may involve secreting the active substance from the skin to which the film is attached.

[0025] The step of thinning the film may also involve the activator melting the film.

[0026] Since the present invention can be modified in various ways and can have various embodiments, specific embodiments are shown in the drawings and will be described in detail in the detailed description of the invention. The advantages and features of the present invention, as well as methods for achieving them, will become apparent by referring to the embodiments described in detail below together with the drawings. However, the present invention is not limited to the embodiments disclosed below, and can be implemented in various forms.

[0027] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. When describing with reference to the drawings, the same or corresponding components will be given the same reference numerals, and duplicate descriptions thereof will be omitted.

[0028] In the following embodiments, terms such as "first" and "second" are not used in a limiting sense but are used to distinguish one component from another.

[0029] In the following embodiments, singular expressions include plural expressions unless the context clearly indicates otherwise.

[0030] In the following embodiments, terms such as "comprise" or "have" mean the presence of features or components described in this specification, and do not preclude the possibility that one or more other features or components may be added.

[0031] In the following embodiments, when a film, region, component, or other part is said to be "on" or "above" another part, this includes not only when it is directly on top of the other part, but also when there is another film, region, component, or the like interposed therebetween.

[0032] In the drawings, the size of components may be exaggerated or reduced for the sake of convenience of explanation. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for the sake of convenience of explanation, and the present invention is not necessarily limited to those shown in the drawings.

[0033] FIG. 1 is a diagram showing a skin patch according to one embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1 and an enlarged view.

[0034] 1 and 2, the skin patch 1 has a film 100 attached to the skin, and can deliver an active ingredient to the skin or protect the skin from the external environment depending on the function of the film 100.

[0035] The skin patch 1 may be flexible to improve adhesion to the skin, and may be elastic to allow it to be attached to various positions on the body.

[0036] The skin patch 1 can have various shapes and sizes depending on the location where it is attached and the purpose of use. For example, the skin patch 1 can have various shapes such as a polygonal, circular, or elliptical shape. The skin patch 1 can also have various sizes depending on the area to be covered. However, for the sake of convenience, the following description will focus on an embodiment in which the skin patch 1 has a rectangular shape as shown in FIG. 1.

[0037] The skin patch 1 can have a base sheet 10 and a film 100 .

[0038] The base sheet 10 supports the film 100 , and one side of the base sheet 10 is exposed to the outside, while the other side of the base sheet 10 faces the film 100 .

[0039] In an optional embodiment, an intermediate layer 15 can be disposed between the base sheet 10 and the film 100. The intermediate layer 15 can have adhesive properties so that the film 100 is attached to the base sheet 10. The film 100 can be supported on the base sheet 10 by the intermediate layer 15.

[0040] The adhesive strength of the intermediate layer 15 can be changed by adding a substance. The adhesive strength of the intermediate layer 15 can be reduced so that the base sheet 10 can be easily removed from the film 100 after the film 100 is attached to the skin. For example, the adhesive strength of the intermediate layer 15 can be reduced by contacting it with a solution, and once the adhesive strength of the intermediate layer 15 is reduced, the base sheet 10 can be easily separated from the film 100.

[0041] In one embodiment, the intermediate layer 15 has degradable properties and can be decomposed by liquid. For example, the intermediate layer 15 can be dissolved by water, and when the base sheet 10 is sufficiently immersed in water, a portion of the intermediate layer 15 can be decomposed. When the intermediate layer 15 is decomposed, the adhesive force between the base sheet 10 and the film 100 can be reduced, and the base sheet 10 can be easily separated from the film 100.

[0042] In other embodiments, intermediate layer 15 can have a lower adhesive strength than second layer 120 of film 100. When base sheet 10 is removed after second layer 120 of film 100 has adhered to the skin, base sheet 10 can be easily separated because the adhesive strength between second layer 120 and the skin is lower than the adhesive strength between base sheet 10 or first layer 110 and intermediate layer 15.

[0043] In any embodiment, the skin patch 1 may further include a liner sheet 20. The liner sheet 20 may cover one side of the film 100 and protect the surface of the film 100 that is to be attached to the skin. The liner sheet 20 may be separated from the film 100 when the film 100 is to be attached to the skin.

[0044] The film 100 can be disposed on the base sheet 10. The film 100 can be disposed between the base sheet 10 and the liner sheet 20. The film 100 can be flexible and elastic so as to adhere closely to the skin to which it is attached, and can be made of a biocompatible material.

[0045] Hereinafter, activation of the film 100 is defined as a change in the state of the film 100 due to contact of an activating substance AM with the film 100 (see FIG. 7). For example, when the film 100 is activated, the film 100 may become thinner, more closely adhere to the skin, or more transparent so that the area of ​​the skin to which it is attached appears transparent from the outside. Furthermore, when the film 100 is activated, the film 100 may become more flexible and softer.

[0046] An activator AM can be defined as a substance that changes the state of the film 100 to an active state. The activator AM can react with the film 100 to change the state of the film 100.

[0047] The activator AM may be in the form of a liquid, gel, or the like that is applied or sprayed onto the film 100. For example, it may be water that is applied or sprayed onto the surface of the film 100, or it may be a cosmetic product such as a lotion or cream.

[0048] The activator AM may be a secretion secreted from the skin, and when secretions are produced in the area where the film 100 is attached, the film 100 can absorb and activate the secretions.

[0049] In one embodiment, once the film 100 is attached to the skin as in FIG. 7, an activator AM can be sprayed onto the outside of the film 100 with an implement such as a spray SP.

[0050] In other embodiments, before applying film 100 to the skin, the user can pre-apply an activator AM to the skin and then apply film 100 onto the skin. Over time, the activator can dissolve film 100, activating it.

[0051] The film 100 may have a multi-layer structure; as an example, the film 100 may comprise a first layer 110 and a second layer 120 .

[0052] The first layer 110 may be disposed adjacent to the base sheet 10. The first layer 110 may be formed of a biocompatible material and may be activated with an activator AM.

[0053] The first layer 110 may be partially dissolved by the activator AM and become thinner. As the thickness of the first layer 110 becomes thinner, the film 100 may adhere more closely to the skin S, increasing its transparency. Therefore, even when the film 100 is attached to the skin, the skin can be exposed to the outside without feeling strange.

[0054] The first layer 110 can be formed of a material that is dissolved by the activator AM. The first layer 110 can be formed of a material that decomposes on contact with the activator AM.

[0055] In one embodiment, the first layer 110 can be made from polyurethane. The activating material AM can react with the polyurethane to reduce the thickness of the first layer 110. The activating material AM can dissolve the polyolefin in the polyurethane to reduce the thickness of the first layer 110.

[0056] The first layer 110 may additionally contain beneficial substances (not shown) depending on the intended use of the skin patch 1 .

[0057] In one embodiment, the first layer 110 can include an ultraviolet blocking material, so that the skin patch 1 can block ultraviolet light in the area where the film 100 is attached.

[0058] When the film 100 is activated, the transparency of the film 100 increases, so that the skin patch 1 can have a UV blocking effect without becoming cloudy. Also, when the film 100 is activated, the film 100 becomes thinner, so that it can be attached to the area where it is attached without any foreign feeling.

[0059] In another embodiment, the first layer 110 may have a mark or symbol (not shown) printed therein. When the film 100 is activated after being attached to the skin, the first layer 110 thins, increasing the transparency of the first layer 100 and making the mark or symbol more visible.

[0060] The second layer 120 contacts the skin and may be adhesive. The second layer 120 may be supported by the liner sheet 20 and may secure the first layer 110 to the skin S.

[0061] In any embodiment, the second layer 120 may include an active ingredient (EM). The active ingredient (EM) may be defined as a substance that is delivered into the body through the skin to which the film 100 is attached, and may be variously set as a drug, cosmetic, functional substance, or the like.

[0062] The first layer 110 can have a first thickness T1, and the second layer 120 can have a second thickness T2 that is thinner than the first layer 110. Referring to Figure 9, when the film 100 is activated, the first layer 110 can thin from the first thickness T1 to a first thickness T1'.

[0063] The intermediate layer 15 has a third thickness T3, which may be thinner than the second thickness T2. The intermediate layer 15 is disposed between the first layer 110 and the base sheet 10 and may have a lower adhesive strength than the second layer 120.

[0064] The adhesive strength of the intermediate layer 15 can be changed by adding an additive. When the additive is absorbed into the intermediate layer 15, the adhesive strength of the intermediate layer 15 may decrease. For example, when a liquid additive is absorbed into the intermediate layer 15, the intermediate layer 15 changes shape to a gel or liquid, allowing the base sheet 10 to slide easily within the film 100.

[0065] Fig. 3 is an enlarged view showing a modified example of Fig. 2. Fig. 3 is an enlarged view of region A of Fig. 2.

[0066] 3, the skin patch can include a film 100A disposed between a base sheet 10 and a liner sheet 20. An intermediate layer 15 can be disposed between the base sheet 10 and the film 100A.

[0067] The film 100A may have a single layer structure, with the area adjacent to the liner sheet 20 having adhesive properties and capable of adhering to the skin.

[0068] The film 100A can be made of a material that is dissolvable by the activator AM, and portions of the film 100A can dissolve, allowing the film 100A to better adhere to the skin and increase transparency. In one example, the film 100A can be made of polyurethane, like the first layer 110 described above.

[0069] In any embodiment, the film 100A may include an active ingredient EM. In one example, the active ingredient EM may be a drug, cosmetic, functional substance, or the like that can be delivered into the body through the skin S.

[0070] In another example, the active ingredient EM may include a substance that protects the skin S. In one example, the active ingredient EM is not delivered to the skin S, and can be set to a substance that can protect the skin from the external environment, such as an ultraviolet blocking agent.

[0071] 4 to 9 are diagrams showing how to use the skin patch of FIG. 1, and FIGS. 10 and 11 are flow charts showing how to use the skin patch of FIG.

[0072] 4 to 11, a method of using the skin patch 1 can include a step S10 of attaching the film to the skin and a step S20 of reducing the thickness of the film with an activating substance.

[0073] Step S10 of attaching the film can include step S11 in which the base sheet absorbs the solution to reduce the adhesive force between the base sheet and the film, step S12 in which the base sheet and the film are attached to the skin, and step S13 in which the base sheet is separated from the film.

[0074] Referring to FIG. 4, in step S11, in which the base sheet absorbs the solution to reduce the adhesive force between the base sheet and the film, the adhesive force of the intermediate layer 15 of the skin patch 1 can be reduced.

[0075] In the skin patch 1, the additive substance may be absorbed into the intermediate layer 15, which may reduce the adhesive strength of the intermediate layer 15. The additive substance, which is a solution, can be absorbed into the intermediate layer 15 in various ways.

[0076] For example, when the skin patch 1 is immersed in the solution DW stored in the container B as shown in Figure 4, the solution DW is absorbed into the base sheet 10 and penetrates into the intermediate layer 15. The intermediate layer 15 may have a reduced adhesive strength due to the solution DW.

[0077] In another example, the solution DW can be sprayed from the top or side of the base sheet 10, allowing the solution DW to penetrate the intermediate layer 15. The intermediate layer 15 may have low adhesive strength due to the solution DW.

[0078] Although the figure shows that the liner sheet 20 is removed after the solution DW has been absorbed into the skin patch 1, this is not limiting. The solution DW may be absorbed into the skin patch 1 before the liner sheet 20 is removed from the skin patch 1 and the film 100 is attached to the skin S.

[0079] 5, in step S12 of attaching the base sheet and film to the skin, the liner sheet 20 is removed and then the skin patch 1 can be attached to the skin S. The skin patch 1 can be fixed to the skin S by the adhesive force of the second layer 120.

[0080] 6, in step 13 of separating the base sheet from the film, the base sheet 10 can be removed. Since the adhesive strength of the intermediate layer 15 has been reduced by the solution DW, the user can easily separate the base sheet 10 from the film 100.

[0081] In other embodiments, step S10 of attaching the film can include step S12 of attaching the base sheet and film to the skin and step S13 of separating the base sheet from the film. Step S11 of forming an intermediate layer 15 with lower adhesive strength than the second layer 120, in which the base sheet absorbs the solution and reduces the adhesive strength between the base sheet and the film, can be omitted.

[0082] The intermediate layer 15 may have a lower adhesive strength than the second layer 120 of the film 100. When the base sheet 10 is removed after the second layer 120 of the film 100 has been attached to the skin, the adhesive strength between the second layer 120 and the skin is lower than the adhesive strength between the base sheet 10 or the first layer 110 and the intermediate layer 15, so the base sheet 10 can be easily separated.

[0083] Referring to FIG. 7, an activator AM can be applied or sprayed onto the film 100 in step 20 where the activator reduces the thickness of the film.

[0084] 7, an activator AM can be sprayed onto the first layer 110 of the film 100 by a spray SP. When the activator AM reacts with the first layer 110, the thickness of the first layer 110 can be reduced and the flexibility of the first layer 110 can be increased.

[0085] In an optional embodiment, to enhance the reaction between the first layer 110 and the activator AM, the user can apply pressure to the film 100 using a puff or the like to the first layer 110 to which the activator AM has been applied. The pressure allows the activator AM to penetrate into the first layer 110.

[0086] 8, when the skin patch 1 is attached to the skin S, a gap VO is formed between the film 100 and the skin S due to the uneven surface. The gap VO formed between the film 100 and the skin S can reflect or distort visible light incident from the outside. Therefore, the film does not appear transparent when viewed from the outside, and wrinkles may easily occur.

[0087] 9, when the film 100 is activated by the activating substance AM, the first layer 110 reduces in thickness from the first thickness T1 to a first thickness T1', becoming softer and more adhesive to the skin. That is, the first layer 110 adheres to the uneven surface of the skin S, eliminating voids VO. Furthermore, the thickness of the first layer 110 is reduced, increasing transparency.

[0088] 12 and 13 are graphs showing the UV blocking effect of the skin patch of FIG.

[0089] The skin patches of Figures 12 and 13 contain a UV-blocking material in the film, and have UV-blocking properties, water resistance (Figure 12), and blocking retention (Figure 13). In the graphs, the x-axis represents wavelength, and the y-axis is defined as the blocking rate.

[0090] The 25-μm-thick skin patch film had a measured ultraviolet protection factor (UPF) of 343, blocking 99.9% of UV-B and 95.8% of UV-A.

[0091] The skin patch film is 35 μm thick and the film's ultraviolet protection factor (UPF) was measured to be 429, blocking 99.9% of UV-B and 97.4% of UV-A.

[0092] In the water resistance test, the skin patch was fixed to a 96-well plate, and the experimental environment was configured so that both the inner and outer surfaces of the film of the skin patch were immersed in water. Water immersion (20 minutes) and drying (20 minutes) were repeated.

[0093] In the graph of Figure 12, the skin patch was immersed in water and dried 8 times over 160 minutes, immersed in water and dried 16 times over 320 minutes, immersed in water and dried 24 times over 480 minutes, and immersed in water and dried 32 times over 640 minutes. The UV blocking effect of the skin patch did not decrease even after repeated immersion in water and drying. In particular, it was confirmed that the skin patch maintained nearly 100% blocking effect in the UV-B wavelength band and the UV-A wavelength band below 390 nm, even after repeated immersion in water and drying.

[0094] Furthermore, the UV blocking effect does not decrease even when physical stimulation is applied to the skin patch using ultrasound.

[0095] In the test for UV protection retention, the skin patch was attached to the skin and the UV protection effect was measured at the initial time and after 12 hours. The UV protection effect did not decrease even after 12 hours of attachment of the skin patch to the skin.

[0096] To maintain UV protection, topical UV protection products must be applied continuously at two-hour intervals. This is because even if cream-type UV protection products are applied, the blocking rate decreases due to sweat, physical contact, a decrease in the effectiveness of the UV protection agent, and absorption of the agent into the skin.

[0097] The skin patch of the present invention maintains its water resistance and blocking power even after the patch is attached to the skin and the film is activated. Unlike conventional cream-type UV screeners, the skin patch of the present invention can continuously block UV rays after being attached without losing its UV blocking effect due to external environments such as underwater.

[0098] Table 1 below shows the results of an experiment in which the skin patch of the present invention was exposed to water and an activating substance for 24 hours, and then it was confirmed whether the following test items were detected.

[0099] The skin patch of the present invention can be selected from ingredients that have UV absorption / blocking functions. This test targeted multiple skin patches containing at least one of the ingredients in Table 1, and in each test, the following ingredients were not detected even after prolonged exposure to water or activating substances.

[0100] [Table 1]

[0101] The skin patch of the present invention has no detectable components even when exposed to water or an activating substance for a long period of time. It has been confirmed that the components are contained within the film and do not leak out. In particular, it has been confirmed that even when exposed to an activating substance, the activating substance simply dissolves the base material, and the components contained within do not leak out.

[0102] The skin patch of the present invention prevents leakage of ingredients even when exposed to the external environment, thereby reducing skin troubles. In particular, when the skin patch is activated, only the base material dissolves and the thickness decreases, preventing leakage of the ingredients contained therein and ensuring stability.

[0103] FIG. 14 is a photograph showing the skin patch of FIG. 1 in use.

[0104] Figure 14(A) is a photograph of the skin patch after it was attached to the skin but before the film was activated. As shown in (A), the area where the film was attached is glossy, making it easy to distinguish between the glossy area where the film was attached and the matte area where the film was not attached.

[0105] Figure 14(B) is divided into an upper and lower section. The upper section is the area where the film is not activated, and the lower section is the area where the film is activated. The upper section of (B) maintains its glossiness, while the lower section can change to a matte finish upon activation. The glossy upper section and the matte lower section can be easily distinguished.

[0106] Although the present invention has been described with reference to the embodiments shown in the drawings, these are merely illustrative, and those skilled in the art will recognize that various modifications and equivalent embodiments are possible. Therefore, the true technical scope of protection of the present invention should be determined by the technical spirit of the appended claims. Some embodiments are given below. Item 1 A skin patch comprising a base sheet and a film disposed on the base sheet, the film having a reduced thickness due to an activating substance. Section 2 Item 1. The skin patch described in item 1, wherein the film becomes more transparent when activated by the activating substance. Section 3 The activator is Item 1. The skin patch according to item 1, wherein the agent is sprayed onto the film, painted onto the film, or secreted from the skin to which the film is attached. Section 4 The film is Item 1. The skin patch according to item 1, which becomes more flexible when activated. Section 5 Item 1. The skin patch described in item 1, wherein the activating substance dissolves the film. Section 6 The film is a first layer adjacent to the base sheet; Item 1, a skin patch according to item 1, comprising a second layer disposed on one side of the first layer and containing an active ingredient to be delivered to the skin. Section 7 Item 7. The skin patch according to item 6, wherein an intermediate layer having a lower adhesive strength than the second layer is disposed between the first layer and the base sheet. Section 8 The intermediate layer is Item 8. The skin patch according to item 7, which loses adhesive strength upon contact with a solution. Section 9 A method for using a skin patch having a base sheet and a film, comprising: applying the film to the skin; and reducing the thickness of said film with an activating agent. Item 10 The step of attaching the film comprises: allowing the base sheet to absorb a solution to reduce the adhesion between the base sheet and the film; adhering the base sheet and the film to the skin; Item 10. A method for using the skin patch described in item 9, comprising a step of separating the base sheet from the film. Section 11 The step of thinning the film comprises: Item 10. The method for using the skin patch according to item 9, wherein the thickness of the film is reduced when the active substance comes into contact with the film. Item 12 The step of thinning the film comprises: Item 10. A method for using a skin patch according to Item 9, wherein the active substance is secreted from the skin to which the film is attached. Item 13 The step of thinning the film comprises: Item 10. The method of using the skin patch according to item 9, wherein the activator dissolves the film.

Claims

1. A base sheet and a film disposed on the base sheet; A skin patch comprising: The film is a first layer adjacent to the base sheet and having a reduced thickness due to an activator sprayed onto the film; a second layer disposed on one side of the first layer and containing an active ingredient to be delivered to the skin; A skin patch comprising:

2. The skin patch of claim 1 , wherein the film becomes more transparent when activated by the activating substance.

3. The activator is The skin patch of claim 1 , which is sprayed onto the film or painted onto the film.

4. The film is 10. The skin patch of claim 1, which becomes more flexible upon activation.

5. The skin patch of claim 1 , wherein the activator dissolves the film.

6. The film is 10. The skin patch of claim 1, which changes from glossy to matte upon activation.

7. The skin patch of claim 1 , further comprising an intermediate layer disposed between the first layer and the base sheet, the intermediate layer having a lower adhesive strength than the second layer.

8. The intermediate layer is The skin patch of claim 7, which becomes less adhesive upon contact with a solution.

9. A method for using a skin patch having a base sheet and a film, comprising: applying the film to the skin, the film comprising a first layer adjacent to the base sheet and a second layer disposed on one side of the first layer and comprising an active ingredient to be delivered to the skin; applying or spraying an activator onto the film; and reducing the thickness of said first layer with an activating agent.

10. The step of attaching the film comprises: allowing the base sheet to absorb a solution to reduce the adhesion between the base sheet and the film; adhering the base sheet and the film to the skin; 10. A method of using the skin patch of claim 9, further comprising the step of separating the base sheet from the film.

11. The step of thinning the film comprises:

10. The method of claim 9, wherein the thickness of the film decreases when the activator contacts the film.

12. The step of thinning the film comprises:

10. The method of claim 9, wherein the activator dissolves the film.

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