Coating film comprising frist coating layer and second coating layer, method of producing coating film and display apparatus comprising the same

Abstract

The invention discloses a coating film, a method for manufacturing the coating film, and a display device including the coating film, the coating film comprising a base film, a first coating layer on the base film, a second coating layer on the first coating layer, and an interlayer bonding polymer disposed across the first coating layer and the second coating layer.

Description

Coating film including first coating layer and second coating layer and display device including the same The present disclosure relates to a coating film comprising a first coating layer and a second coating layer, a method for manufacturing the coating film, and a display device comprising the coating film. Light-transmitting films are a core material for optical and flexible displays, and their importance is growing. In particular, they are being used as a glass alternative in the display industry due to their lightweight, processability, and flexibility. However, light-transmitting films are generally considered to have inferior mechanical properties to glass, such as poorer surface hardness and wear resistance. Therefore, research is underway to improve their wear resistance in order to facilitate their application in the display industry. In a method of improving the mechanical or optical properties of a light-transmitting film, a coating layer may be disposed on the surface of the light-transmitting film. A light-transmitting film having a coating layer is also referred to as a "coating film." [Technical Issues] Therefore, the present disclosure is made in view of the above problems, and one aspect of the present disclosure is to provide a coating film with excellent adhesion. Another aspect of the present disclosure is to provide a coating film including a first coating layer and a second coating layer, wherein the coating film has excellent adhesion strength between the first coating layer and the second coating layer. Another aspect of the present disclosure is to provide a coating film having excellent hardness, wear resistance, and adhesion. Another aspect of the present disclosure is to provide a method for manufacturing a coating film. Another aspect of the present disclosure is to provide a display device including a coating film. [Technical Solution] According to one aspect of the present disclosure, the above and other objects can be achieved by providing a coating film comprising a base film, a first coating layer on the base film, a second coating layer on the first coating layer, and an interlayer bonding polymer configured across the first coating layer and the second coating layer, wherein the coating film has a grid pattern peelability of 1 or less. One end of the interlayer bonding polymer may be disposed in the first coating layer, and the other end of the interlayer bonding polymer may be disposed in the second coating layer. The interlayer bonding polymer may be formed by polymerization of photopolymerizable monomers. The interlayer bonding polymer may contain an acrylic polymer. The second coating layer may contain an acrylic polymer resin. The first coating may contain a silicone resin. The first coating layer may be formed from a first coating composition containing an epoxy-based silicone binder and an acrylic silicone binder. The epoxy silicone adhesive may contain epoxy silicone monomers, and the acrylic silicone adhesive may contain acrylic silicone monomers. The epoxy-based siloxane monomer can be polymerized by heat treatment, and the acrylic-based siloxane monomer can be polymerized by light irradiation. The silicone resin may include epoxy silicone resin and acrylic silicone resin. The epoxy silicone resin may include epoxy silicone repeating units, the acrylic silicone resin may include acrylic silicone repeating units, and the number of the epoxy silicone repeating units may be greater than the number of the acrylic silicone repeating units. The first coating layer may contain an acrylic siloxane monomer. The second coating layer can be formed by photopolymerization of an acrylic composition. The interlayer bonding polymer can be formed by photopolymerization of the acrylic siloxane monomer contained in the first coating composition and the acrylic composition used to form the second coating layer. The refractive index difference between the base film and the first coating layer may be 0.1 to 0.3, and the refractive index difference between the first coating layer and the second coating layer may be less than 0.1. The coating film may have a light transmittance of 90% or higher. The second coating layer may have a pencil hardness of 5H or higher. According to another aspect of the present disclosure, a method for manufacturing a coating film is provided, comprising applying a first coating composition to a base film, applying heat to the first coating composition to form a first coating layer, applying a second coating composition to the first coating layer, and irradiating the second coating composition with light to form a second coating layer, wherein the first coating composition contains an epoxy siloxane monomer and an acrylic siloxane monomer, and the second coating composition contains an acrylic monomer, and based on the total weight of the monomers contained in the first coating composition, the epoxy siloxane monomer is present in an amount of 30% to 70% by weight, and the acrylic siloxane monomer is present in an amount of 30% to 70% by weight. The epoxy silicone adhesive may contain an epoxy silicone monomer, and the acrylic silicone adhesive may contain an acrylic silicone monomer. In the step of forming the second coating layer, the acrylic silicone monomer contained in the first coating layer and the acrylic monomer contained in the second coating composition are polymerized by light irradiation to form an interlayer polymer spanning the first coating layer and the second coating layer. The epoxy-based siloxane monomer may be polymerized by applying heat to the first coating composition, while the acrylic-based siloxane monomer may not be polymerized by applying heat to the first coating composition. The acrylic silicone binder contained in the first coating layer and the acrylic monomer contained in the second coating composition can be polymerized by irradiating the second coating composition with light. In the step of forming the second coating layer, the acrylic silicone binder contained in the first coating layer and the acrylic monomer contained in the second coating composition may be polymerized to form an interlayer bonding polymer spanning the first coating layer and the second coating layer. The interlayer bonding polymer may be disposed across the interface between the first coating and the second coating. According to another aspect of the present disclosure, a display device is provided, comprising a display panel and a coating film disposed on the display panel. [Beneficial Effects] The coating film according to one embodiment of the present disclosure may have excellent adhesion because it includes an interlayer bonding polymer disposed across the first coating layer and the second coating layer. The coating film according to one embodiment of the present disclosure may have excellent adhesion stability, wear resistance and hardness. According to one embodiment of the present disclosure, by controlling the composition and curing conditions of the first coating layer and the second coating layer during the coating film production process, an interlayer polymer configured to span the first coating layer and the second coating layer can be formed. The coating film according to one embodiment of the present disclosure can be attached to the display surface of a display device. The display device including the coating film can have excellent hardness, surface wear resistance and coating stability. Hereinafter, the present disclosure will be described in detail with reference to examples. However, the following examples are only provided for a better understanding of the present disclosure and are not intended to limit the scope of the present disclosure. When the terms "including," "having," or "containing" are used herein, other parts may also be present unless "only" is used at the same time. Terms in the singular form may include plural meanings unless otherwise specified. Furthermore, when interpreting an element, even if not explicitly described, the element should be interpreted as including a range of errors. When describing a positional relationship, for example, when using “on,” “above,” “below,” or “next to,” this may include situations where there is no contact between them, unless “immediately” or “directly” is used. When describing temporal relationships, for example, when using “after,” “subsequent,” “next,” or “before” to describe a temporal sequence, this may include cases of non-sequential relationships unless “immediately” or “directly” is used. It should be understood that although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are merely used to distinguish between the elements. Therefore, within the scope of the technical concept of this disclosure, a first element may be referred to as a second element. It should be understood that the term "at least one" includes all combinations of one or more items. For example, "at least one of a first element, a second element, and a third element" may include all combinations of two or more elements selected from the first element, the second element, and the third element, as well as each of the first element, the second element, and the third element. The features of the various embodiments of the present disclosure may be partially or completely integrated or combined with each other, and may interoperate and drive each other in various ways. The embodiments of the present disclosure may be performed independently of each other, or may be performed together in an interrelated manner. FIG. 1 is a schematic diagram illustrating a coating film 100 according to an embodiment of the present disclosure. 1 , a coating film 100 according to an embodiment of the present disclosure includes a base film 110 , a first coating layer 120 on the base film 110 , and a second coating layer 130 on the first coating layer 120 . A light-transmitting film may be used as the base film 110. A polyimide-based (PI) film may be used as the light-transmitting film. The polyimide-based (PI) film may be a polyimide film or a polyamide-imide film. According to one embodiment of the present disclosure, a polyimide film can be prepared from monomer components including a dicarbonyl-based compound and a diamine-based monomer. More specifically, according to another embodiment of the present disclosure, a polyimide film can include imide repeating units formed from a dianhydride and a diamine. Furthermore, the polyimide film can be prepared from monomer components including dicarbonyl compounds other than dianhydrides and diamines. Therefore, the polyimide film according to one embodiment of the present disclosure can have both imide repeating units and amide repeating units. For example, the polyimide film having both imide repeating units and amide repeating units can be a polyamide-imide resin. However, an embodiment of the present disclosure is not limited thereto, and the base film 110 may be a polycarbonate (PC) film, a polyacrylic film, a polyethylene terephthalate film, a cellulose film, or the like. According to an embodiment of the present disclosure, the thickness of the base film 110 is not particularly limited. The base film 110 may have a thickness sufficient to allow the coating film 100 to protect the display panel. For example, the base film 110 may have a thickness of 10 μm to 100 μm. According to an embodiment of the present disclosure, the first coating layer 120 is disposed on the base film 110 . The first coating layer 120 serves as an interface layer between the two layers. It has excellent adhesion to the base film 110 and excellent adhesion to the second coating layer 130. The first coating layer 120 serves as an interface layer between the base film 110 and the second coating layer 130. Therefore, the first coating layer 120 can be referred to as an "interface layer," an "adhesion-promoting layer," or even a "primer layer." The first coating layer 120 may function to improve the adhesive strength between the base film 110 and the second coating layer 130. The second coating layer 130 may be stably attached to the base film 110 through the first coating layer 120. In order for the second coating layer 130 to be stably attached to the base film 110 , the first coating layer 120 may have a thickness of 0.05 μm to 1.0 μm. When the thickness of the first coating layer 120 is less than 0.05 μm, it may be difficult to stably attach the second coating layer 130 to the base film 110. As a result, adhesive strength and adhesion between the base film 110 and the second coating layer 130 may be reduced. On the other hand, when the thickness of the first coating layer 120 exceeds 1.0 μm, the thickness of the coating film 100 may become greater than necessary, and the flexibility and foldability of the coating film 100 may deteriorate, and the optical properties may also deteriorate. According to one embodiment of the present disclosure, the first coating layer 120 may include a silicone resin. More specifically, the first coating layer 120 may be formed of a first coating composition containing a silicone binder. For example, the first coating layer 120 may be formed of a first coating composition containing an epoxy-based silicone adhesive and an acrylic silicone adhesive. The epoxy-based silicone adhesive may contain an epoxy-based silicone monomer, and the acrylic silicone adhesive may contain an acrylic silicone monomer. According to one embodiment of the present disclosure, the first coating composition containing the epoxy-silicone adhesive can be polymerized or cured by thermal polymerization. Therefore, according to one embodiment of the present disclosure, the first coating layer 120 can be formed by thermal polymerization of the first coating composition. The epoxy siloxane monomer may be, for example, 3-glycidoxypropyl trimethoxysilane. 3-glycidoxypropyl trimethoxysilane may be, for example, KBM-403 produced by ShinEtsu Chemical Co., Ltd. However, the present disclosure is not limited thereto, and other known epoxy siloxane monomers may be used. The epoxy siloxane monomer may be, for example, 2-(3,4-epoxycyclohexyl)ethyl trimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, or the like. The acrylic siloxane monomer may be, for example, 3-methacryloxypropyl trimethoxysilane. According to one embodiment of the present disclosure, 3-methacryloxypropyl trimethoxysilane may be used. For example, 3-methacryloxypropyl trimethoxysilane may be KBM-503 from ShinEtsu Chemical Co., Ltd. However, the present disclosure is not limited thereto, and other known acrylic siloxane monomers may be used. The acrylic siloxane monomers may include, for example, 3-acryloxypropyl trimethoxysilane, 3-methacryloxypropyl methyldimethoxysilane, and the like. According to one embodiment of the present disclosure, the content of the epoxy siloxane monomer in the first coating composition used to form the first coating layer 120 may be greater or less than the content of the acrylic siloxane monomer. Relative to the total weight of the monomers contained in the first coating composition, the content of the epoxy siloxane monomer may be 30 to 70 weight percent, and the content of the acrylic siloxane monomer may be 30 to 70 weight percent. Specifically, relative to the total weight of the monomers contained in the first coating composition, the content of the epoxy siloxane monomer may be 40 to 60 weight percent, and the content of the acrylic siloxane monomer may be 40 to 60 weight percent. More specifically, the content of the epoxy siloxane monomer may be 45 to 55 weight percent, and the content of the acrylic siloxane monomer may be 45 to 55 weight percent. However, one embodiment of the present disclosure is not limited thereto, and relative to the total molar amount of monomers contained in the first coating composition, the content of the epoxy siloxane monomer may be 40 to 60 mol %, and the content of the acrylic siloxane monomer may be 40 to 60 mol %. According to one embodiment of the present disclosure, the epoxy siloxane monomer can be polymerized by heat treatment, and the acrylic siloxane monomer can be polymerized by light irradiation. Furthermore, according to an embodiment of the present disclosure, the silicone resin of the first coating layer 120 may include epoxy silicone resin and acrylic silicone resin. The epoxy silicone resin may include epoxy silicone repeating units, and the acrylic silicone resin may include acrylic silicone repeating units. The first coating layer 120 may include an acrylic siloxane monomer. The acrylic siloxane monomer contained in the first coating layer 120 corresponds to an unreacted acrylic monomer. According to one embodiment of the present disclosure, the second coating layer 130 is disposed on the first coating layer 120. According to one embodiment of the present disclosure, the second coating layer 130 may contain an acrylic polymer resin. The second coating layer 130 may be formed of a second coating composition that may contain a polymerizable monomer. According to one embodiment of the present disclosure, the second coating composition may contain an acrylic monomer. Acrylic monomers are polymerizable monomers. The second coating composition containing acrylic monomers may be referred to as an "acrylic composition." The second coating composition containing acrylic monomers can be cured by thermal polymerization. Therefore, according to one embodiment of the present disclosure, the second coating layer 130 can be formed by thermal polymerization of the acrylic composition serving as the second coating composition. According to one embodiment of the present disclosure, dipentaerythritol hexaacrylate (DPHA) may be used as an acrylic monomer for forming the second coating layer 130 . However, the present disclosure is not limited thereto, and other known acrylic monomers may be used as monomers for forming the second coating layer 130. The acrylic monomers may include, for example, pentaerythritol triacrylate (PETA) and hexanediol diacrylate (HDDA). According to one embodiment of the present disclosure, the second coating composition may further contain a silane compound and a polymeric curing agent in addition to the acrylic monomer. The polymeric curing agent may include glycol and water (H 2O). According to an embodiment of the present disclosure, siloxane can be formed from a silane compound. Specifically, the second coating layer 130 can be formed by polymerizing and curing the silane compound, thereby forming a coating composition. The coating composition according to an embodiment of the present disclosure may further contain at least one additive selected from the group consisting of a polymerization initiator, an antioxidant, a leveling agent, and a coating aid. According to one embodiment of the present disclosure, the polymerization initiator may include, for example, a photopolymerization initiator such as an organic metal salt or a thermal polymerization initiator such as an amine or imidazole. The polymerization initiator may be used in an amount of about 0.01 to 2 parts by weight based on 100 parts by weight of the polymerizable monomer. According to one embodiment of the present disclosure, an organic solvent can be used to form the second coating layer 130. The viscosity of the second coating composition can be controlled by the organic solvent. Therefore, the processability of the coating composition can be controlled, and the thickness of the second coating layer 130 can be easily adjusted. For example, the organic solvent may include at least one selected from the group consisting of ketones such as acetone, methyl ethyl ketone, methyl butyl ketone and cyclohexanone, glycol ethers such as methyl glycol ether and butyl glycol ether, ethers such as diethyl ether and dioxane, alcohols such as isobutanol, isopropanol, butanol and methanol, halogenated hydrocarbons such as dichloromethane, chloroform and trichloroethylene, and hydrocarbons such as n-hexane, benzene and toluene. According to one embodiment of the present disclosure, the second coating layer 130 may be formed by polymerization and curing of the second coating composition. For example, the second coating composition is pre-polymerized to form a paste prepolymer, an organic solvent is added to the prepolymer to prepare a paste second coating composition with adjusted viscosity, and then the second coating composition is applied to the first coating layer 120 on the base film 110, followed by curing and polymerization to form the second coating layer 130. More specifically, when the first coating layer 120 is coated with the second coating composition, the first coating layer 120 may contain a polymer obtained by polymerizing an epoxy-based siloxane monomer and may contain an acrylic-based siloxane monomer. According to an embodiment of the present disclosure, the second coating layer 130 can be formed by coating or molding the first coating layer 120 with the second coating composition using a method such as coating, casting, or molding according to an embodiment of the present disclosure, followed by thermal polymerization. When the second coating composition is polymerized, the light intensity suitable for photopolymerization is 50 mJ / cm 2 or higher and 20,000 mJ / cm 2 To obtain a uniform surface before light irradiation, heat treatment may be performed at a temperature of 40°C or higher and about 200°C or lower. For example, the first coating layer 120 on the base film 110 may be coated with the second coating composition and dried at 80° C. for 5 minutes, and then the first coating layer 120 coated with the second coating composition may be irradiated with 120 mW / cm 2 and 2 J / cm 2 The UV_A performs thermal polymerization. The coating film 100 according to an embodiment of the present disclosure may include an interlayer bonding polymer 140 disposed across the first coating layer 120 and the second coating layer 130 . One end of the interlayer bonding polymer 140 may be disposed on the first coating layer 120, and the other end of the interlayer bonding polymer 140 may be disposed on the second coating layer 130. For example, the interlayer bonding polymer 140 may be disposed across the interface between the first coating layer 120 and the second coating layer 130. FIG. 1 illustrates an interlayer coating polymer 140 disposed across the interface between a first coating layer 120 and a second coating layer 130 . FIG. 2 is a schematic diagram illustrating a process of forming an interlayer bonding polymer 140 according to an embodiment of the present disclosure. Referring to Figure 2 , the interlayer bonding polymer 140 can be formed by polymerizing a photopolymerizable monomer. Specifically, the interlayer bonding polymer 140 can be formed by light irradiation. According to one embodiment of the present disclosure, when the second coating composition is applied to the first coating layer 120, the epoxy siloxane monomers in the first coating layer 120 polymerize while the acrylic siloxane monomers do not. According to one embodiment of the present disclosure, the acrylic siloxane monomer contained in the first coating composition for forming the first coating layer 120 corresponds to a photopolymerizable monomer. In addition, the acrylic monomer used to form the second coating layer 130 corresponds to a photopolymerizable monomer. Specifically, the monomer contained in the first coating 120 in FIG2 refers to an acrylic siloxane monomer. 1 may be a hydrocarbon group including a siloxy group. In addition, the monomer contained in the second coating layer 130 in FIG2 may be an acrylic monomer. 2 may be a substituted or unsubstituted hydrocarbon group. According to one embodiment of the present disclosure, the interlayer bonding polymer 140 may be formed by photopolymerization of the acrylic siloxane monomer contained in the first coating composition for forming the first coating layer 120 and the acrylic monomer for forming the second coating layer 130 . The interlayer bonding polymer 140 may include, for example, an acrylic polymer. The interlayer bonding polymer 140 may include an acrylic repeating unit formed from an acrylic siloxane monomer and a repeating unit formed from an acrylic monomer. According to one embodiment of the present disclosure, the epoxy repeating units formed from acrylic siloxane monomers in the first coating layer 120 may be linked to the repeating units formed from acrylic monomers in the second coating layer 130 to form an interlayer bonding polymer 140 (see FIG. 2 ). More specifically, the interlayer bonding polymer 140 may be formed by photopolymerization of the acrylic silicone binder contained in the first coating composition for forming the first coating layer 120 and the acrylic composition for forming the second coating layer 130 . FIG3A illustrates the interlayer interlayer polymer 140 formed by the process for producing the interlayer interlayer polymer 140 shown in FIG2. In FIG3A, R 1 may be a hydrocarbon group including a siloxane group, R 2 may be a substituted or unsubstituted hydrocarbon group, and R 3 can be hydrogen, a hydrocarbon group, a polymerizable reaction group, a free radical, or a substituted hydrocarbon group. In FIG3A , “n” is a natural number. FIG3B illustrates another embodiment of the interlayer bonding polymer 140. The interlayer bonding polymer 140 shown in FIG3B is an acrylate. In FIG3B, R 11 It can be a hydrocarbon group containing a siloxy group, R 21 may be a substituted or unsubstituted hydrocarbon group, and R 31 It can be hydrogen, a hydrocarbon group, a polymerizable group, a free radical, or a substituted hydrocarbon group. In FIG3B , “m” is a natural number. Figure 4 is a schematic diagram illustrating a process for producing an interlayer polymer according to another embodiment of the present disclosure. Figures 5A and 5B are schematic diagrams illustrating an interlayer polymer structure according to another embodiment of the present disclosure. In Figures 4 and 5A, R 12 It can be a hydrocarbon group containing a siloxy group, R 22 may be a substituted or unsubstituted hydrocarbon group, and R 32 It can be hydrogen, hydrocarbon group, polymerizable group, free radical or substituted hydrocarbon group. 4 and R 5 can each be hydrogen or a hydrocarbon group. In FIG5A , “p” is a natural number. In Figure 5B, R 1 may be a hydrocarbon group including a siloxy group, R 23 may be a substituted or unsubstituted hydrocarbon group, and R 33 It can be hydrogen, hydrocarbon group, polymerization reaction group, free radical or substituted hydrocarbon group. 41 and R 51 Each may be hydrogen or a hydrocarbon group. In FIG5B , “q” is a natural number. As can be seen from Figures 2, 3A, 3B, 4, 5A, and 5B, one end of the interlayer bonding polymer 140 is disposed on the first coating layer 120, and the other end of the interlayer bonding polymer 140 is disposed on the second coating layer 130. Due to the interlayer bonding polymer 140, the first coating layer 120 and the second coating layer 130 can have excellent adhesion, tack, and adhesion stability. In addition, the first coating layer 120 and the second coating layer 130 have excellent adhesion, tack, and adhesion stability, so that the coating film 100 can have excellent hardness. According to one embodiment of the present disclosure, the second coating layer 130 can have excellent hardness, light transmittance, wear resistance, and scratch resistance. Therefore, the coating film 100 including the second coating layer 130 can have excellent hardness, light transmittance, wear resistance, and scratch resistance. According to one embodiment of the present disclosure, the second coating layer 130 may have a thickness of 2 to 10 μm. When the thickness of the second coating layer 130 is less than 2 μm, the hardness, wear resistance, and scratch resistance imparted by the second coating layer 130 to the coating film 100 may not be sufficiently achieved. When the thickness of the second coating layer 130 is greater than 10 μm, the thickness of the coating film 100 may increase and the elasticity of the coating film 100 may decrease. According to one embodiment of the present disclosure, the difference in refractive index between the base film 110 and the first coating layer 120 may be 0.1 to 0.3. Furthermore, the difference in refractive index between the first coating layer 120 and the second coating layer 130 may be less than 0.1. The first coating layer 120 may have a similar refractive index to that of the second coating layer 130. Furthermore, according to one embodiment of the present disclosure, the difference in refractive index between the base film 110 and the second coating layer 130 may be in the range of 0.1 to 0.3. With the difference in refractive index between the base film 110 and the second coating layer 130 adjusted to the range of 0.1 to 0.3, the coating film 100 may have excellent light transmittance. According to one embodiment of the present disclosure, due to the difference between the materials constituting the base film 110 and the materials constituting the second coating layer 130, it is not easy to adjust the refractive index difference between the base film 110 and the second coating layer 130 to 0.1 or less. At the same time, because the refractive index difference between the base film 110 and the second coating layer 130 is adjusted to 0.3 or less, excessive reflection does not occur between the base film 110 and the second coating layer 130. Therefore, the coating film 100 can have excellent light transmittance. The base film 110 may have a refractive index of, for example, 1.6 to 1.7, and the second coating layer 130 may have a refractive index of 1.4 to 1.55. In addition, the first coating layer 120 may have a refractive index of 1.4 to 1.53. According to one embodiment of the present disclosure, the coating film 100 may have a light transmittance of 90% or higher. The light transmittance can be measured using a spectrophotometer in a wavelength range of 360 to 740 nm according to JIS K 7361. The spectrophotometer may be, for example, a haze meter HM-150 / Murakami Color Laboratory. According to one embodiment of the present disclosure, the second coating layer 130 has a pencil hardness of 4H or higher. Therefore, the coating film 100 has a pencil hardness of 4H or higher. Pencil hardness can be measured using a pencil hardness tester from IMOTO (Japan) according to the measurement conditions of ASTM D3363 at a speed of 180 mm / min and a load of 750 gf. According to one embodiment of the present disclosure, the coating film 100 has a grid pattern peelability of 1 or less. The grid pattern peelability is obtained by forming 100 grid patterns (10 x 10) (1 mm x 1 mm in size) on the second coating layer 130 of the coating film 100 using a cutter, attaching a transparent 3M Scotch tape (48 mm, #3650) to the surface of the second coating layer, removing the tape from the surface, and measuring the number of grid patterns on the second coating layer 130 that separated from the coating film 100 and adhered to the tape within 0.1 seconds after removal. When forming the grid pattern on the second coating layer 130 using a cutter, only the second coating layer 130 is cut without cutting the base film 110. The first coating layer 120 may be partially cut or not cut due to its small thickness. The grid pattern can be formed, for example, by the method shown in FIG. 9 . FIG. 9 is a schematic cross-sectional view illustrating a process of forming a mesh pattern 130 p to measure peelability of the mesh pattern. 9 , the mesh pattern 130p may be formed by cutting from the surface of the second coating layer 130 to the first coating layer 120 based on the thickness direction of the coating film 100. In the process of forming the mesh pattern 130p, the second coating layer 130 may be cut by a cutter K. The cutting groove 130s is formed by cutting with a cutter K. The cutting groove 130s may penetrate the second coating layer 130 and partially penetrate the first coating layer 120. Each mesh pattern 130p may be defined by the cutting groove 130s. In the coating film 100 according to an embodiment of the present disclosure, since the second coating layer 130 has excellent adhesion strength to the first coating layer 120, the second coating layer 130 is not easily separated from the first coating layer 120. Therefore, the coating film 100 according to an embodiment of the present disclosure can have a grid pattern peelability of 1 or less. Furthermore, the coating film 100 according to an embodiment of the present disclosure can have a grid pattern peelability of 1 or less after heat treatment at 230 degrees Celsius for 1 hour. Specifically, even when the grid pattern peelability of the coating film 100 according to an embodiment of the present disclosure is measured after heat treatment at 230 degrees Celsius for 1 hour, the coating film 100 according to an embodiment of the present disclosure can still have a grid pattern peelability of 1 or less. The coating film 100 according to an embodiment of the present disclosure may have a yellowness index of 3.0 or less. More specifically, the coating film 100 according to an embodiment of the present disclosure may have a yellowness index of 2.5 or less. Furthermore, the coating film 100 according to an embodiment of the present disclosure may have a yellowness index of 3.0 or less, more specifically, a yellowness index of 2.5 or less, after heat treatment at 230 degrees Celsius for 1 hour. Another embodiment of the present disclosure provides a method for producing a coating film 100 . 6A to 6C are schematic cross-sectional views illustrating a process for producing a coating film 100 according to one embodiment of the present disclosure. A method for producing a coating film 100 according to another embodiment of the present disclosure will be described in detail with reference to FIG. According to another embodiment of the present disclosure, a method for producing a coating film 100 includes applying a first coating composition 121 to a base film 110, applying heat to the first coating composition 121 to form a first coating layer 120, applying a second coating composition 131 to the first coating layer 120, and irradiating the second coating composition 131 with light to form a second coating layer 130. 6A , a first coating composition 121 is applied onto the base film 110 . A light-transmitting film may be used as the base film 110. A polyimide-based (PI) film may be used as the light-transmitting film. Examples of the polyimide-based (PI) film include a polyimide film and a polyamide-imide film. The first coating composition 121 may contain epoxy-based silicone adhesive and acrylic-based silicone adhesive. According to one embodiment of the present disclosure, the epoxy silicone adhesive may contain epoxy silicone monomers. Furthermore, the acrylic silicone adhesive may contain acrylic silicone monomers. On a molar basis, the epoxy silicone monomer content may be greater than the acrylic silicone monomer content. Then, heat (HEAT) is applied to the first coating composition 121. Applying heat to the first coating composition 121 is also referred to as "heat treatment." 6A , a first coating layer 120 is formed on a base film 110. The first coating layer 120 is formed by applying heat (HEAT) to a first coating composition 121. Specifically, the epoxy-based siloxane monomer is polymerized by applying heat (HEAT) to the first coating composition 121. As a result, an epoxy-based siloxane polymer is formed in the first coating layer 120. The first coating composition 121 contains an acrylic siloxane monomer in addition to the epoxy siloxane monomer. However, the acrylic siloxane monomer is not polymerized by applying heat (HEAT) to the first coating composition 121 . Even after the heat treatment according to FIG. 6A , the acrylic silicone monomer serving as the acrylic silicone binder remains in the first coating layer 120 . 6B , a second coating composition 131 is applied onto the first coating layer 120. The second coating composition 131 contains an acrylic monomer. When the second coating composition is applied onto the first coating layer 120, the epoxy siloxane monomer contained in the first coating composition 121 has been polymerized, while most of the acrylic siloxane monomer has not yet been polymerized. Next, the second coating composition 131 is irradiated with light (LIGHT), and as a result, the second coating layer 130 is formed as shown in FIG6C . The acrylic monomer contained in the second coating composition 131 is polymerized by light (LIGHT) irradiated onto the second coating composition 131 . As a result, an acrylic polymer 135 is formed. The acrylic polymer 135 is formed on the second coating layer 130 . Furthermore, the acrylic silicone binder contained in first coating layer 120 is polymerized by light (light) irradiating second coating composition 131. Specifically, the acrylic silicone monomer contained in the acrylic silicone binder is polymerized by light (light). As a result, acrylic silicone polymer may also be formed in first coating layer 120, forming interlayer bonding polymer 140 in this process (see Figures 2 and 4). According to one embodiment of the present disclosure, in the step of forming the second coating layer 130 , the acrylic silicone binder contained in the first coating layer 120 as a primer layer and the acrylic monomer contained in the second coating composition 131 are polymerized to form an interlayer bonding polymer 140 spanning the first coating layer 120 and the second coating layer 130 . An interlayer bonding polymer 140 is formed at the interface between the first coating layer 120 and the second coating layer 130 . The interlayer coating polymer 140 may include an acrylic repeating unit formed from an acrylic siloxane monomer included in the first coating composition 121 and a repeating unit formed from an acrylic monomer included in the second coating composition 131 . FIG7 is a cross-sectional view illustrating a portion of a display device 200 according to another embodiment of the present disclosure. FIG8 is an enlarged cross-sectional view illustrating portion “P” in FIG7 . 7 , a display device 200 according to another embodiment of the present disclosure includes a display panel 501 and a coating film 100 on the display panel 501. In FIG7 , the display device 200 including the coating film 100 of FIG1 is disclosed. 7 and 8 , a display panel 501 includes a substrate 510, a thin film transistor (TFT) on the substrate 510, and an organic light-emitting device 570 connected to the thin film transistor (TFT). The organic light-emitting device 570 includes a first electrode 571, an organic light-emitting layer 572 on the first electrode 571, and a second electrode 573 on the organic light-emitting layer 572. The display device 200 shown in FIG. 5 and FIG. 6 is an organic light-emitting display device. The substrate 510 may be made of glass or plastic. Specifically, the substrate 510 may be made of plastic such as polyimide resin or coating. Although not shown, a buffer layer may be disposed on the substrate 510. The thin film transistor (TFT) is disposed on the substrate 510 . The thin film transistor TFT includes a semiconductor layer 520 , a gate electrode 530 insulated from and at least partially overlapping the semiconductor layer 520 , a source electrode 541 connected to the semiconductor layer 520 , and a drain electrode 542 spaced apart from the source electrode 541 and connected to the semiconductor layer 520 . 8 , a gate insulating layer 535 is disposed between the gate electrode 530 and the semiconductor layer 520 . An interlayer insulating layer 551 may be disposed on the gate electrode 530 , and a source electrode 541 and a drain electrode 542 may be disposed on the interlayer insulating layer 551 . The planarization layer 552 is disposed on the thin film transistor TFT to planarize the top of the thin film transistor TFT. The first electrode 571 is disposed on the planarization layer 552. The first electrode 571 is connected to the thin film transistor TFT through a contact hole in the planarization layer 552. The bank layer 580 is disposed on a portion of the first electrode 571 on the planarization layer 552 to define a pixel region or a light emitting region. For example, the bank layer 580 is disposed in a matrix at boundaries between a plurality of pixels to define each pixel region. The organic light-emitting layer 572 is disposed on the first electrode 571. The organic light-emitting layer 572 may also be disposed on the bank layer 580. The organic light-emitting layer 572 may include a single light-emitting layer or two or more light-emitting layers stacked in a vertical direction. The organic light-emitting layer 572 may emit light of any of red, green, and blue colors, or may emit white light. The second electrode 573 is disposed on the organic light emitting layer 572 . The first electrode 571 , the organic light emitting layer 572 , and the second electrode 573 may be stacked to constitute the organic light emitting device 570 . Although not shown, when the organic light emitting layer 572 emits white light, each pixel may include a color filter for filtering the white light emitted from the organic light emitting layer 572 based on a specific wavelength. The color filter is formed on the light path. The thin film encapsulation layer 590 may be disposed on the second electrode 573. The thin film encapsulation layer 590 may include at least one organic layer and at least one inorganic layer, and the at least one organic layer and the at least one inorganic layer may be alternately disposed. The coating film 100 is disposed on the display panel 501 having the stacked structure. The coating film 100 can be used as a protective window to cover and protect the light emitting surface of the display panel 501. Hereinafter, the present disclosure will be described in more detail with reference to specific examples and comparative examples. However, these examples and comparative examples are provided only for a better understanding of the present disclosure and should not be construed as limiting the present disclosure. <Example 1> (1) Formation of the first coating layer 120 An epoxy-silicone adhesive was prepared by mixing 100 mmol (23.63 g) of 3-glycidyloxypropyltrimethoxysilane (KBM-403 from Shin-Etsu Chemical) as an epoxy-silicone monomer, 150 mmol (2.7 g) of distilled water, and 0.1 g of sodium hydroxide in a 50 ml flask, followed by stirring at 60°C for 4 hours. Mixing and stirring were performed in an open system. An acrylic silicone adhesive was prepared by mixing 100 mmol (24.84 g) of 3-methacryloyloxypropyltrimethoxysilane (KBM-503 from Shin-Etsu Chemical) as an acrylic silicone monomer, 150 mmol (2.7 g) of distilled water, and 0.1 g of sodium hydroxide in a 50 ml flask, followed by stirring at 60°C for 4 hours. Mixing and stirring were performed in an open system. 1.5 g of an epoxy silicone adhesive (3-glycidyl ether propyl trimethoxy silane; 1.341 g), 1.5 g of an acrylic silicone adhesive (3-methacryloxypropyl trimethoxy silane; 1.348 g), 97 g of butanone, and 0.03 g of ethyl-4-methylimidazole were mixed and then stirred in a flask to prepare a first coating composition. Preparation of polyimide film (CPI) with a thickness of 50 μm ® , KOLON) as the base film 110. The prepared first coating composition was applied to the base film 110 using a No. 8 Mayer rod, dried at 80° C. for 2 minutes, and then heat-treated at 120° C. for 5 minutes (thermal polymerization and photocuring) to form the first coating layer 120. During the process of forming the first coating layer 120, the epoxy-based siloxane monomer 3-glycidylpropyltrimethoxysilane contained in the first coating composition may be polymerized, while the acrylic siloxane monomer 3-methacryloyloxypropyltrimethoxysilane may remain unpolymerized. (2) Formation of the second coating layer 130 Dipentitol hexaacrylate (DPHA) is used as an acrylic monomer for forming the second coating layer 130 . Specifically, 3 g of DPHA and 0.15 g of 2,2-dimethoxy-2-phenylacetophenone were dissolved in 6 g of butanone to prepare a coating composition. The prepared coating composition was applied onto the formed first coating layer 120 using a No. 16 Mayer rod, dried at 80° C. for 5 minutes, and then heated at 120 mW / cm 2 and 2 J / cm 2 UV_A is irradiated under conditions of for photopolymerization and photocuring, thereby forming a second coating layer 130. Thus, the coating film 100 of Example 1 was prepared. <Example 2> A coating film was prepared in the same manner as in Example 1, except that 2 g of an epoxy silicone binder (3-glycidylpropyltrimethoxysilane; 1.788 g), 1 g of an acrylic silicone binder (3-methacrylatepropyltrimethoxysilane; 0.899 g), 97 g of butanone, and 0.03 g of 2-ethyl-4-methylimidazole were mixed and stirred in a flask to prepare a first coating composition. <Example 3> A coating film was prepared in the same manner as in Example 1, except that 1 g of an epoxy-based silicone binder (3-glycidylpropyltrimethoxysilane; 0.894 g), 2 g of an acrylic silicone binder (3-methacrylatepropyltrimethoxysilane; 1.797 g), 97 g of butanone, and 0.03 g of the 2-ethyl-4-methylimidazole prepared in Example 1 were mixed and stirred in a flask to prepare a first coating composition. <Example 4> The first coating layer 120 was formed in the same manner as in Example 1. Pentaerythritol triacrylate (PETA) is used as an acrylic monomer for forming the second coating layer 130 . Specifically, 3 g of PETA and 0.15 g of 2,2-dimethoxy-2-phenylacetophenone were dissolved in 6 g of butanone to prepare a second coating composition. The prepared coating composition was applied onto the formed first coating layer 120 using a No. 16 Mel rod and dried at 80° C. for 5 minutes. The coating composition was then irradiated with UV_A at 120 mW / cm2 and 2 J / cm2 for photopolymerization and photocuring, thereby forming a second coating layer 130. <Example 5> The first coating layer 120 was formed in the same manner as in Example 2, and the second coating layer 130 was formed in the same manner as in Example 4. <Example 6> The first coating layer 120 was formed in the same manner as in Example 3, and the second coating layer 130 was formed in the same manner as in Example 4. Comparative Example 1 A coating film was prepared in the same manner as in Example 1, except that 1 g of an epoxy-based silicone binder (3-glycidylpropyltrimethoxysilane; 0.894 g), 3 g of an acrylic silicone binder (3-methacrylatepropyltrimethoxysilane; 2.696 g), 129 g of butanone, and 0.03 g of the 2-ethyl-4-methylimidazole prepared in Example 1 were mixed and stirred in a flask to prepare a first coating composition. Comparative Example 2 A coating film was prepared in the same manner as in Example 1, except that the first coating layer 120 was not formed. Specifically, 3 g of DPHA and 0.15 g of 2,2-dimethoxy-2-phenylacetophenone were dissolved in 6 g of butanone to prepare a second coating composition. The prepared second coating composition was coated onto a polyimide film (CPI) with a thickness of 50 μm using a No. 16 Mayer rod. ® , KOLON) as the base film 110, and then dried at 80°C for 5 minutes, and then the second coating composition was irradiated with UV_A under the conditions of 120 mW / cm2 and 2 J / cm2 for photopolymerization and photocuring, thereby forming a second coating layer 130. Thus, a coating film of Comparative Example 2 was prepared. Comparative Example 3 A coating film was prepared in the same manner as in Example 1, except that 3 g of the epoxy silicone binder prepared in Example 1, 97 g of butanone, and 0.03 g of 2-ethyl-4-methylimidazole were mixed and stirred in a flask without adding the acrylic silicone binder to prepare a first coating composition. Comparative Example 4 A coating film was prepared in the same manner as in Example 1, except that 3 g of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate (Sigma Aldrich) as an epoxy monomer, 97 g of butanone, and 0.03 g of 2-ethyl-4-methylimidazole were mixed and stirred in a flask to prepare a first coating composition. <Comparative Example 5> A coating film was prepared in the same manner as in Example 1, except that 1.5 g of 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate (Sigma Aldrich) as an epoxy monomer, 1.5 g of DPHA as an acrylic monomer, 97 g of butanone, and 0.03 g of 2-ethyl-4-methylimidazole were mixed and stirred in a flask to prepare a first coating composition. <Comparative Example 6> A coating film was prepared in the same manner as in Example 1, except that 3 g of the acrylic silicone binder prepared in Example 1, 97 g of butanone, and 0.03 g of 2-ethyl-4-methylimidazole were mixed and stirred in a flask without adding the epoxy silicone binder used in Example 1 to prepare a first coating composition. <Comparative Example 7> A coating film was prepared in the same manner as in Example 1, except that 1.5 g of the acrylic silicone binder, 1.5 g of DPHA, 97 g of butanone, and 0.03 g of 2-ethyl-4-methylimidazole prepared in Example 1 were mixed and stirred in a flask without adding the epoxy silicone binder used in Example 1 to prepare a first coating composition. The types and contents of the components used in Examples 1 to 6 and Comparative Examples 1 to 7 are shown in Table 1. [Table 1] *Epoxy silicone adhesive: 3-glycidoxypropyl trimethoxysilane + distilled water + sodium hydroxide *Epoxy monomer: 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate Acrylic silicone adhesive: 3-methacryloxypropyl trimethoxysilane + distilled water + sodium hydroxide * Acrylic monomer: DPHA <Measurement Example> The physical properties of the coating films produced in Examples 1 to 6 and Comparative Examples 1 to 6 were measured according to the following methods. (1) Measurement of light transmittance (%) The light transmittance was measured using a spectrophotometer in the wavelength range of 360 to 740 nm in accordance with JIS K 7361. The spectrophotometer used here was a haze meter HM-150 manufactured by Murakami Color Research Laboratory. (2) Measurement of pencil hardness Pencil hardness was measured using an IMOTO pencil hardness tester at a speed of 180 mm / min and a load of 750 gf according to ASTM D3363. (3) Grid pattern peelability A cutter was used to form 100 grid patterns (10 x 10) each having a size of 1 mm x 1 mm on the second coating layer 130 of the coating film 100, transparent 3M Scotch box tape (48 mm, #3650) was attached to the surface of the second coating layer 130, the tape was removed from the surface, and the number of grid patterns on the second coating layer 130 that separated from the coating film 100 and adhered to the tape was measured within 0.1 seconds after removal. The grid pattern 130p can be formed using the method shown in FIG9 . The grid pattern 130p can be created by forming grid grooves 130s in the second coating layer 130 using a cutter K. When the grid pattern 130p is formed in the second coating layer 130 using the cutter K, only the second coating layer 130 is cut, and the base film 110 and the first coating layer 120 are not cut. The first coating layer 120 may be partially cut. The coating films produced in Examples and Comparative Examples were measured for their grid pattern releasability (measured before heat treatment), and their yellowness index was measured again after the coating films were heat treated at 230° C. for 1 hour. (4) Confirmation of interlayer polymer 140 Infrared spectroscopy was used to determine whether the interlayer linking polymer was disposed across the first coating layer 120 and the second coating layer 130. Specifically, infrared spectroscopy was used to determine whether unreacted acrylic groups (1,700 to 1,750 cm) were present in the first coating layer 120. -1 The interlayer conjugated polymer 140 is detected based on the presence of the surface reactive molecules. More specifically, according to the examples and comparative examples of the present disclosure, after forming the first coating layer 120 and before forming the second coating layer 130, the monomer remaining in the first coating layer 120 is an acrylic monomer, and unreacted acrylic monomer also exists on the surface of the first coating layer 120. Therefore, the acrylic monomer corresponds to a surface-reactive molecule. In the embodiment of the present disclosure, the acrylic siloxane monomer may correspond to the unreacted acrylic monomer. The presence of unreacted acrylic groups in the IR spectrum (1,700 to 1,750 cm -1 ) as surface-reactive molecules, indicating that unreacted acrylic monomers capable of participating in polymerization exist within and on the surface of the first coating layer 120 when the second coating layer 130 is formed. When the unreacted acrylic monomers present within and on the surface of the first coating layer 120 participate in polymerization, as shown in Figures 2 and 4, the unreacted acrylic monomers (acrylic siloxane monomers) of the first coating layer 120 and the acrylic monomers of the second coating composition 131 may react. As a result, an interlayer bonded polymer 140 may be formed. Therefore, the peak of the unreacted acrylic group exists in the infrared spectrum (1,700 to 1,750 cm -1 ), i.e., surface reactive molecules, means that interlayer bonding polymer 140 is formed. (5) Measurement of yellow index The yellowness index was measured using a spectrophotometer (CM-3600A, Konica Minolta, Inc) according to ASTM E313-73. The yellowness index of the coating films produced in Examples and Comparative Examples was measured (measured before heat treatment), and the yellowness index was measured again after the coating films were heat treated at 230° C. for 1 hour. The measurement results are shown in Table 2 below. [Table 2] In the item "Presence of Interlayer Interlayer Polymer" in Table 2, "Y" indicates the presence of an interlayer interlayer polymer, and "N" indicates the absence of an interlayer interlayer polymer. In the "surface-reactive molecule presence" item in Table 2, "Y" indicates the presence of a surface-reactive molecule, and "N" indicates the absence of a surface-reactive molecule. As can be seen from Table 2, the coating films 100 according to Examples 1 to 6 had a light transmittance of 90% or higher, a pencil hardness of 4H or higher, and a grid pattern peelability of 1 or lower. In Comparative Example 1, an excessive amount (over 70% by weight) of acrylic silicone binder was used in the first coating composition, resulting in an excessive amount (over 70% by weight) of acrylic silicone monomer present in the first coating composition. This confirmed that an excessive amount of unreacted acrylate was present in the first coating layer during the second coating layer formation step, resulting in reduced releasability of the grid pattern compared to the coating film produced in Comparative Example 1. It can be seen that in Comparative Example 2 which does not include the first coating layer 120 as an interface layer or an adhesion promoting layer, no interlayer bonding polymer is formed, the grid pattern is peeled off, and thus the pencil hardness is reduced. It can be seen that in Comparative Example 3 which does not include the acrylic silicone adhesive and the acrylic monomer, the interlayer bonding polymer is not formed, and the grid pattern peelability and pencil hardness are reduced. It can be seen that in Comparative Example 4, which did not include an acrylic silicone adhesive and an acrylic monomer, no interlayer polymer was formed. Comparative Example 4, which did not include a silicone monomer, had a relatively low light transmittance, deteriorated mesh pattern peelability and pencil hardness, and increased yellowness after high-temperature treatment, resulting in reduced heat resistance. Comparative Example 5, which does not include a silicone adhesive containing a silicone monomer, shows reduced light transmittance and grid pattern peelability despite the formation of an interlayer polymer. In Comparative Example 5, the pencil hardness remains unchanged, but the yellowness index increases after high-temperature treatment. In Comparative Examples 6 and 7, the first coating composition including an acrylic siloxane binder and an acrylic monomer without an epoxy monomer and an epoxy silicone binder was used. Due to the presence of a large amount of unreacted acrylic acid in the first coating layer, severe grid pattern peelability and reduced pencil hardness were observed. On the other hand, it can be seen that the coating films according to the embodiments of the present disclosure (Examples 1 to 6) have excellent surface properties and excellent adhesion. Thus, the coating film according to one embodiment of the present disclosure has excellent hardness, scratch resistance, and adhesion, and can therefore be used as a cover window or protective film for a display device. 100: Coating film 110: Base film 120: First coating layer 121: First coating composition 130: Second coating layer 130p: Grid pattern 130s: Cutting groove 131: Second coating composition 135: Acrylic polymer 140: Interlayer bonding polymer 200: Display device 501: Display panel 510: Substrate 520: Semiconductor layer 530: Gate electrode 535: Gate insulating layer 541: Source electrode 542: Drain electrode 551: Interlayer insulating layer 552: Planarization layer 570: Organic light-emitting device 571: First electrode 572: Organic light-emitting layer 573: Second electrode 580: Bank layer 590: Thin film encapsulation layer K: Cutter P: Part of TFT: Thin film transistor Figure 1 is a schematic diagram illustrating a coating film according to an embodiment of the present disclosure. Figure 2 is a schematic diagram illustrating a process for producing an interlayer-bonded polymer according to an embodiment of the present disclosure. Figures 3A and 3B are schematic diagrams illustrating an interlayer-bonded polymer structure according to an embodiment of the present disclosure. Figure 4 is a schematic diagram illustrating an interlayer-bonded polymer structure according to another embodiment of the present disclosure. Figures 5A to 5B are schematic diagrams illustrating an interlayer-bonded polymer structure according to an embodiment of the present disclosure. Figures 6A to 6C are schematic cross-sectional views illustrating a process for manufacturing a coating film according to an embodiment of the present disclosure. Figure 7 is a cross-sectional view illustrating a portion of a display device according to another embodiment of the present disclosure. Figure 8 is an enlarged cross-sectional view illustrating portion "P" in Figure 5. Figure 9 is a cross-sectional view illustrating a process for forming a grid pattern to measure the peelability of the grid pattern. 100: coating 110: basement membrane 120: First coating 130: Second coating 140: interlayer bonding polymer

Claims

1. A coating film, comprising: Base film; A first coating is applied to the base film; A second coating is applied over the first coating; And an interlayer polymer, configured across the first coating and the second coating, wherein the second coating comprises an acrylic polymer resin and the first coating comprises an acrylic silicone monomer, and wherein the coating has a grid pattern peelability of 1 or less, wherein the grid pattern peelability is obtained by forming 100 grid patterns (10 x 10) with a size of 1 mm x 1 mm on the second coating of the coating using a cutter, attaching a clear 3M Scotch box tape (48 mm, #3650) to the surface of the second coating, removing the tape from the surface within 0.1 seconds, and measuring the number of grid patterns on the second coating that have separated from the coating and adhered to the tape.

2. The coating as claimed in claim 1, wherein one end of the interlayer polymer is disposed in the first coating layer and the other end of the interlayer polymer is disposed in the second coating layer.

3. The coating as claimed in claim 1, wherein the interlayer polymer is formed by the polymerization of photopolymerizable monomers.

4. The coating as claimed in claim 1, wherein the interlayer bonding polymer comprises an acrylic polymer.

5. The coating as claimed in claim 1, wherein the first coating is formed from a first coating composition comprising an epoxy-based silicone monomer and an acrylic-based silicone monomer.

6. The coating as claimed in claim 5, wherein the second coating is formed by photopolymerization of an acrylic composition, and the interlayer bonding polymer is formed by photopolymerization of the acrylic silicate monomer contained in the first coating composition and the acrylic composition for forming the second coating.

7. The coating as claimed in claim 1, wherein the coating has a light transmittance of 90% or higher.

8. The coating as claimed in claim 1, wherein the second coating has a pencil hardness of 4H or higher.

9. A method for manufacturing a coating film, comprising: The first coating composition is applied to the base film; Heat is applied to the first coating composition to form a first coating, and a second coating composition is applied onto the first coating; The second coating composition is irradiated with light to form a second coating layer; And to form an interlayer composite polymer disposed between the first coating and the second coating; wherein the first coating composition comprises an epoxy silicate monomer and an acrylic silicate monomer, the second coating composition comprises an acrylic monomer, and the epoxy silicate monomer content is 30% to 70% by weight and the acrylic silicate monomer content is 30% to 70% by weight based on the total weight of the monomers contained in the first coating composition.

10. The method as described in claim 9, wherein, When the second coating is formed, the acrylic silicate monomer contained in the first coating composition and the acrylic monomer contained in the second coating composition are polymerized by light irradiation to form an interlayer polymer spanning the first coating and the second coating.

11. The method as described in claim 9, wherein, When the second coating composition is applied to the first coating, the epoxy silicate monomer is in a polymerized state, while the acrylic silicate monomer is in an unpolymerized state.

12. A display device, comprising: Display panel; And a coating as described in any one of claims 1 to 8, disposed on the display panel.

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