Anti-glare coating, anti-glare film, method for manufacturing the same, and display device

Abstract

The application relates to an anti-glare coating, an anti-glare film and a preparation method thereof and a display device. The anti-glare coating comprises a main resin, an auxiliary resin, a solvent, a reactive toughening agent, a leveling agent and a photoinitiator, the main resin comprises a high-density polyethylene grafted modified polyurethane acrylate resin, the auxiliary resin comprises a high-density polyethylene grafted modified polyester acrylate resin, and the reactive toughening agent contains a non-polar segment and a polar reactive group. During a coating and drying process, the reactive toughening agent is phase-separated due to the volatilization of the solvent and the change of the compatibility, and an island structure for anti-glare is formed on the surface of the coating after UV curing. The anti-glare coating can form an anti-glare film on a transparent substrate, does not take silica particles, organic microspheres or a pressing mold as a necessary condition for forming an anti-glare concave-convex structure, and is used on the light-emitting side of a display panel.

Description

Technical Field

[0001] This application relates to the field of optical functional coating technology, and in particular to an anti-glare coating, an anti-glare film, a method for preparing the same, and a display device thereof. Background Technology

[0002] With the expanding application of display terminals, touch screens, automotive displays, and other electronic display products, glare reflected from ambient light on the screen surface can affect the readability of the displayed content. For relatively smooth display covers or optical films, incident light tends to be concentrated and reflected towards the observer in a near-specular manner, forming localized bright spots and thus reducing the contrast of the displayed image and viewing comfort. To reduce this type of reflected glare, an anti-glare layer is typically applied to the display surface. This anti-glare layer often features a micro-uneven structure or an "island" structure, causing incident light to scatter to a certain extent on the surface, thereby reducing concentrated reflected light.

[0003] In existing technologies, a common method for preparing anti-glare films involves adding micron- or submicron-sized particles such as silica particles or organic microspheres to the resin system. These particles form microscopic protrusions on the coating surface, causing diffuse reflection of light. This method is relatively straightforward and suitable for coating production. Besides the particle method, existing technologies have also developed phase separation routes without adding anti-glare particles. For example, by designing solvent evaporation gradients, resin compatibility, and oven temperature changes, phase separation is induced in the resin system during coating curing, thereby forming an anti-glare structure on the coating surface. Other technologies utilize anti-glare molds with micro / nano grid grooves or spherical protrusions to imprint UV adhesive layers before curing to obtain a predetermined surface structure. Furthermore, there are schemes that form anti-glare coatings by causing wet cycloid decomposition or phase separation of two or more polymers that are incompatible near the processing temperature.

[0004] For particle methods, particles may settle over time in the coating solution, affecting the storage stability and service life of the coating. Particle aggregation can also cause appearance defects such as white spots and white lines on the film surface. Furthermore, some particle materials used for optical coatings are expensive. For phase separation methods relying on solvent evaporation gradients and temperature control, the formation of surface microstructures is related to baking temperature, evaporation rate, and resin compatibility changes, resulting in a narrow process window and placing high demands on oven temperature uniformity in large-area continuous production. For die-imprinting methods, die processing and maintenance costs are high, and maintaining uniform imprinting pressure in large-area production is difficult. The viscosity of the wet coating also needs to be controlled within a range suitable for imprinting and maintaining morphology. For schemes using direct phase separation of immiscible polymers, although anti-glare structures can be formed without relying on added particles, it is difficult to simultaneously achieve phase separation scale and surface structure uniformity, potentially leading to a decrease in the clarity of the resulting anti-glare coating.

[0005] Therefore, it is necessary to develop a new anti-glare coating system to address the issues of particle dispersion stability, coating appearance defects, process control difficulty, and the balance between anti-glare performance, clarity, and abrasion resistance in existing anti-glare coatings. This system should be able to utilize the compatibility changes of the coating components during the coating and drying process to form an anti-glare surface structure, and then use the subsequent curing process to solidify this surface structure, thus making it suitable for the preparation of anti-glare films for displays. Summary of the Invention

[0006] The purpose of this application is to provide an anti-glare coating, an anti-glare film, and a method for preparing the same. During the coating and drying process, the reactive toughening agent undergoes phase separation due to solvent evaporation and changes in system compatibility, thereby forming an island-like structure on the coating surface for anti-glare purposes. This reduces reliance on anti-glare particles such as silica particles and organic microspheres, as well as imprinting molds, and improves issues such as particle sedimentation, agglomeration defects, and narrow process control windows. Furthermore, while achieving anti-glare effects, it also considers the coating's transmittance, clarity, adhesion, and abrasion resistance. This objective is achieved through the following technical solutions: The anti-glare coating of this application includes a main resin, an auxiliary resin, a solvent, a reactive toughening agent, a leveling agent, and a photoinitiator. The main resin includes high-density polyethylene grafted and modified polyurethane acrylate resin, and the auxiliary resin includes high-density polyethylene grafted and modified polyester acrylate resin. The reactive toughening agent contains nonpolar segments and polar reactive groups. The nonpolar segments are compatible with the high-density polyethylene graft portion in the main resin and / or the auxiliary resin, and the polar reactive groups are compatible with the polyurethane acrylate resin and / or the polyester acrylate resin. The reactive toughening agent undergoes phase separation due to reduced compatibility with the oligomers formed by the reaction with the main resin and / or the auxiliary resin, thereby forming an island structure on the surface of the cured coating for anti-glare purposes.

[0007] In one embodiment, the main resin is a high-density polyethylene grafted with polyurethane acrylate resin with ≥hexafunctionality, and the refractive index of the main resin is in the range of 1.48 to 1.50. The auxiliary resin is a high-density polyethylene grafted and modified polyester acrylate resin with ≤trifunctionality, and the refractive index of the auxiliary resin is in the range of 1.45 to 1.47.

[0008] In one embodiment, the mass ratio of the main resin, the auxiliary resin, and the reactive toughening agent is (5-7):(0.5-2.5):(0.5-1.5).

[0009] In one embodiment, the reactive toughening agent comprises an elastomer toughening agent containing at least one polar reactive group selected from epoxy, anhydride, ester, and carboxyl groups.

[0010] In one embodiment, the reactive toughening agent includes one or more of the following: ethylene-butyl acrylate-glycidyl methacrylate copolymer, polyolefin elastomer grafted with glycidyl methacrylate, polyolefin elastomer grafted with maleic anhydride, ethylene-methacrylate-glycidyl methacrylate copolymer, epoxy-based polyolefin elastomer, thermoplastic polyester elastomer, and maleic anhydride grafted with styrene-ethylene-butene-styrene block copolymer.

[0011] In one embodiment, the solvent is a good solvent or a mixed solvent that can dissolve the reactive toughening agent under heating conditions and prevent the reactive toughening agent from crystallizing after cooling to room temperature; And / or, the anti-glare coating does not contain silica particles or organic microspheres used to form the anti-glare textured structure.

[0012] This application further provides a method for preparing the aforementioned anti-glare coating, comprising: A reactive toughening agent is added to a solvent and heated and stirred to obtain a toughening agent solution. After cooling the toughening agent solution, add the leveling agent and photoinitiator and stir. Add the auxiliary resin and stir; Add the main resin and stir to obtain the anti-glare coating.

[0013] This application also provides a method for preparing an anti-glare film, comprising: Provide the aforementioned anti-glare coating, or prepare the anti-glare coating using the aforementioned preparation method; The anti-glare coating is applied to the surface of a transparent substrate to form a wet coating. The wet coating is baked to evaporate the solvent and induce phase separation of the reactive toughening agent to form an island structure on the coating surface. The coating after baking is UV cured to fix the island structure and obtain an anti-glare film.

[0014] This application also provides an anti-glare film, which includes a transparent substrate and an anti-glare coating disposed on one side of the transparent substrate. The anti-glare coating is formed by curing the aforementioned anti-glare paint; The surface of the anti-glare coating has an island structure formed by phase separation of the reactive toughening agent, and the thickness of the anti-glare coating is in the range of 3μm to 6μm.

[0015] This application also provides a display device, which includes a display panel and the aforementioned anti-glare film disposed on the light-emitting side of the display panel.

[0016] Compared with the prior art, this application has the following beneficial effects: This application employs high-density polyethylene grafted modified polyurethane acrylate resin as the main resin and high-density polyethylene grafted modified polyester acrylate resin as the auxiliary resin, combined with a reactive toughening agent containing non-polar segments and polar reactive groups. This allows the reactive toughening agent to remain compatible with the main and auxiliary resins in the initial state of the coating. During the coating and drying process, phase separation occurs due to solvent evaporation and changes in the compatibility of the oligomers resulting from the reaction between the toughening agent and the main and / or auxiliary resins. This forms an island structure on the coating surface for scattering incident light. This method does not rely on silica particles, organic microspheres, or other anti-glare particles to form an uneven structure, which helps reduce problems such as white spots or lines on the film surface caused by particle sedimentation and agglomeration over time. At the same time, it does not require anti-glare mold imprinting to form the surface structure, which helps reduce dependence on mold precision, imprinting pressure uniformity, and wet coating viscosity window.

[0017] The main resin provides curing support and abrasion resistance for the coating, while the auxiliary resin adjusts the coating haze and improves the adhesion between the coating and the substrate. The adjustment of the reactive toughening agent content can affect the degree of formation of the surface island structure, thereby controlling the coating haze and gloss. According to the test results of the example, the transmittance of the obtained anti-glare coating can be maintained above 92%, the clarity is 98%, and different anti-glare effects with different haze and gloss can be obtained under different ratios of main resin, auxiliary resin and reactive toughening agent, while taking into account cross-cut adhesion and steel wool resistance. Attached Figure Description

[0018] Figure 1 This is a flowchart of a method for preparing an anti-glare film according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of an anti-glare film provided in one embodiment of this application.

[0019] Explanation of reference numerals in the attached drawings: 100, transparent substrate; 200, anti-glare coating. Detailed Implementation

[0020] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0021] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0022] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] Given that existing anti-glare coatings using silica particles, organic microspheres, or other anti-glare particles are easily affected by factors such as particle dispersion stability, sedimentation over time, and agglomeration defects, while using mold imprinting or relying on direct phase separation of polymers to form the anti-glare structure may have problems such as high mold precision requirements, narrow process control window, or difficulty in simultaneously achieving anti-glare effect and clarity, this application provides an anti-glare coating, an anti-glare film, and a method for preparing the same. This anti-glare coating achieves compatibility through the combination of a high-density polyethylene grafted modified polyurethane acrylate main resin, a high-density polyethylene grafted modified polyester acrylate auxiliary resin, and a reactive toughening agent containing non-polar segments and polar reactive groups. This allows the reactive toughening agent to be relatively uniformly dispersed in the resin system in the initial state of the coating. During the drying process after coating, phase separation occurs due to solvent evaporation and changes in the compatibility of the toughening agent with the oligomers of the main resin and / or auxiliary resin, thereby forming an island structure on the coating surface for anti-glare purposes. Furthermore, the island structure is shaped by subsequent UV curing, so that the resulting anti-glare film can reduce the dependence on external anti-glare particles and imprinting molds while taking into account transmittance, clarity, adhesion and wear resistance. The technical solution of this application will be described below with reference to the accompanying drawings and specific embodiments.

[0024] Anti-glare coatings are used to form anti-glare coatings 200 for display applications. The anti-glare coating 200 typically requires the formation of a microscopic surface structure on the surface of a transparent substrate 100 capable of scattering incident light, thereby reducing concentrated reflection of ambient light from the smooth display surface. In the prior art, anti-glare structures can be formed by adding microparticles to the coating. Existing anti-reflective and anti-glare coating compositions utilize microparticles with an average particle size of 1 μm to 10 μm to participate in the formation of the anti-glare structure. There are also anti-glare coating liquids that use alkenyl-containing organic anti-glare particles and are coated, baked, dried, and UV-cured to form an anti-glare film. Furthermore, there are schemes that utilize molds with micro / nano-scale mesh grooves and spherical micro / nano-scale protrusions to imprint a UV adhesive layer to form an anti-glare structural layer. Unlike the methods described above, the anti-glare coating of this application does not use silica particles or organic microspheres as necessary components to form the anti-glare uneven structure. Instead, through the compatibility design between the main resin, auxiliary resin, solvent and reactive toughening agent, the reactive toughening agent undergoes phase separation during the coating and drying process, and forms an island structure on the coating surface after subsequent curing, thereby providing a surface scattering structure for the anti-glare film.

[0025] The anti-glare coating comprises a main resin, an auxiliary resin, a solvent, a reactive toughening agent, a leveling agent, and a photoinitiator. The main resin forms the primary curing network of the anti-glare coating 200, providing film-forming properties, mechanical support, and abrasion resistance. The auxiliary resin, together with the main resin, forms the curing resin phase and adjusts the coating haze and adhesion between the coating and the transparent substrate 100. The solvent dissolves or disperses the reactive toughening agent and resin components, and gradually evaporates during the drying process after coating. The leveling agent improves the spreading and leveling of the wet coating on the substrate surface. The photoinitiator initiates the cross-linking and curing of the acrylate resin system under UV irradiation. Specifically, a coating can be formulated using a leveling agent, photoinitiator, main resin, auxiliary resin, solvent, and toughening agent, and then coated, baked at 95°C for 1 minute, and irradiated with 30 mW / cm² UV light for 10 seconds to obtain an anti-glare coating 200 with a thickness of 3 μm to 6 μm.

[0026] The main resin includes a high-density polyethylene (HDPE) graft-modified polyurethane acrylate resin. HDPE graft modification here can be understood as introducing HDPE graft portions or HDPE compatible segments into the polyurethane acrylate resin system. This gives the resin, in addition to the UV-curable properties of acrylate systems, a non-polar structural basis capable of compatibility with the non-polar segments in reactive toughening agents. This application limits the main resin to HDPE graft-modified polyurethane acrylate resin, enabling it not only to participate in UV curing to form a continuous phase but also to cooperate with the compatibility-phase separation process of reactive toughening agents, providing a resin matrix environment for the formation of island structures by the reactive toughening agents during the drying stage. The main resin can be a ≥hexafunctional HDPE graft-modified polyurethane acrylate resin with a refractive index of approximately 1.49, its main function being to provide overall support and wear resistance for the coating.

[0027] The auxiliary resin includes a high-density polyethylene grafted and modified polyester acrylate resin. The auxiliary resin also possesses a curable acrylate structure and maintains compatibility with the non-polar segments in the reactive toughening agent through the high-density polyethylene graft portion. Compared to the main resin, the auxiliary resin can be selected with relatively low functionality and a refractive index that differs from the main resin, used to adjust coating haze, adhesion, and the crosslinking density of the cured coating. The auxiliary resin is a ≤trifunctional high-density polyethylene grafted and modified polyester acrylate resin with a refractive index of approximately 1.46, primarily used to adjust coating haze and increase coating adhesion to the substrate. When the total mass of the main resin and auxiliary resin is constant, changes in the auxiliary resin content affect haze, adhesion, and abrasion resistance. Too low an auxiliary resin ratio results in decreased adhesion, while too high an auxiliary resin ratio may negatively impact abrasion resistance. Therefore, limiting the main resin and auxiliary resin to high-density polyethylene grafted modified polyurethane acrylate resin and high-density polyethylene grafted modified polyester acrylate resin, respectively, is beneficial to define their respective roles in film formation, curing, compatibility control and optical performance adjustment from the material system level.

[0028] The mass ratio of main resin, auxiliary resin, and reactive toughening agent was (5-7):(0.5-2.5):(0.5-1.5). From a mechanistic perspective, the content of reactive toughening agent affects the degree of island-like structure formation on the coating surface, thus influencing haze and gloss; the content of main resin affects the curing network support and wear-resistant base, and also the phase separation environment of the toughening agent during the drying stage; the content of auxiliary resin affects the coating's refractive index matching, haze adjustment, and adhesion performance. Tests showed that the transmittance was above 92%, and the clarity was 98%. Different haze, gloss, cross-cut adhesion, and steel wool resistance were obtained under different toughening agent contents and main / auxiliary resin ratios.

[0029] Reactive toughening agents contain nonpolar segments and polar reactive groups. The nonpolar segments can be polyolefin segments, nonpolar segments from styrene-ethylene-butene-styrene blocks, ethylene copolymer segments, or other segments compatible with the grafted portion of high-density polyethylene. The polar reactive groups can include at least one of epoxy groups, acid anhydride groups, ester groups, and carboxyl groups, or other polar functional groups that can improve the compatibility of the toughening agent with the polyurethane acrylate structure or polyester acrylate structure. Reactive toughening agents include EBA-GMA, POE-GMA, POE-MAH, EMA-GMA, ABS, PTW, TPEE, and SEBS-MAH. GMA-type materials contain glycidyl ester structures, and MAH-type materials contain maleic anhydride structures; both can serve as examples of elastomer toughening agents with polar or reactive functional groups. In this application, the reactive toughening agent does not directly provide particle protrusions as conventional anti-glare particles. Instead, in the initial state of the coating, it relies on non-polar segments and polar reactive groups to maintain compatibility with the main and auxiliary resins grafted with high-density polyethylene. During the drying process after coating, phase separation occurs due to solvent evaporation and changes in system compatibility, forming a dispersed phase island structure.

[0030] The reactive toughening agent can be selected from one or more of the following: ethylene-butyl acrylate-glycidyl methacrylate copolymer, polyolefin elastomer grafted with glycidyl methacrylate, polyolefin elastomer grafted with maleic anhydride, ethylene-methacrylate-glycidyl methacrylate copolymer, epoxy-based polyolefin elastomer, thermoplastic polyester elastomer, and maleic anhydride grafted with styrene-ethylene-butene-styrene block copolymer. The above materials can be understood as lower-level examples; their higher-level technical features lie in containing elastomer segments compatible with the non-polar portion of the resin system, and polar or reactive functional groups that can improve their compatibility with the polar portion of the acrylate resin. The reactive toughening agent of this application does not refer to all thermoplastic resins or rubbers in general, but rather to toughening materials that, based on segment compatibility and functional group compatibility, maintain dispersion compatibility in the initial mixing stage and undergo phase separation induced by solvent evaporation and changes in the resin system during the drying stage.

[0031] The solvent is a good solvent or mixed solvent capable of dissolving the reactive toughening agent under heating conditions and preventing it from crystallizing after cooling to room temperature. The role of this solvent is not limited to reducing the viscosity of the coating; it also includes providing a dissolving and dispersing environment for the reactive toughening agent in the initial stage of formulation, enabling it to form a relatively homogeneous initial coating system with the main and auxiliary resins. During the drying process after coating, solvent evaporation causes the reactive toughening agent to lose its good solvent carrier and reduces its compatibility with the resin system, thereby inducing phase separation. Solvents include one or more of propylene glycol methyl ether acetate, butyl acetate, butanone, n-butanol, n-hexane, n-heptane, N,N-dimethylformamide, N-methylpyrrolidone, and cyclohexane. These solvents are used to prevent the toughening agent from crystallizing after dissolving upon heating and cooling to room temperature.

[0032] Anti-glare coatings may not contain silica particles or organic microspheres used to form the anti-glare textured structure. "Not containing" here does not exclude the possibility of trace impurities or unavoidable process residues in the coating that are not intended for anti-glare purposes; rather, it means that this application does not use silica particles, organic microspheres, or other anti-glare particles as essential functional components for forming the island structure. Existing technologies have various anti-glare films that utilize silica diffusion particles, organic anti-glare particles, or microparticles to achieve a scattering structure. For example, silica nano-diffusion particles with an average particle size of 60 nm are used. Other methods use organic anti-glare particles, which are then baked, dried, and UV-cured to obtain the anti-glare film. This application forms a surface island structure through phase separation using a reactive toughening agent, reducing reliance on such externally added anti-glare particles and thus differentiating it from conventional particle-based anti-glare coatings. Conventional particle methods may suffer from problems such as particle sedimentation over time, particle agglomeration causing white spots or lines on the film surface, and high costs for particles used in optical coatings. This application, by not using anti-glare particles as an essential component, represents a new technological approach.

[0033] The leveling agent can be a polyacrylate leveling agent, which improves the leveling state of the film surface during the baking or coating drying stages of the main resin, reducing the impact of local pinholes, orange peel, or uneven coating on the formation of island structures and optical appearance. The leveling agent, being a polyacrylate leveling agent, is used to improve the overall leveling effect of the film surface after the molecular weight of the main resin increases during the baking stage. The photoinitiator can be a free radical photoinitiator, used to initiate cross-linking polymerization of acrylate groups in the main and auxiliary resins under UV irradiation, thereby shaping the overall morphology of the coating after the formation of the phase-separated structure. The photoinitiator, being a free radical photoinitiator, is mainly used for UV curing of the coating, initiating a rapid cross-linking polymerization reaction of the resin. Therefore, although the leveling agent and photoinitiator are not the dominant factors in the formation of island structures, they are used to ensure the quality of wet film coating and the curing and shaping effect, respectively.

[0034] The preparation method of anti-glare coating includes first adding a reactive toughening agent to a solvent and heating and stirring to obtain a toughening agent solution; then cooling the toughening agent solution and adding a leveling agent and a photoinitiator while stirring; subsequently adding an auxiliary resin and stirring; and finally adding the main resin and stirring to obtain the anti-glare coating. This preparation sequence matches the compatibility control approach: first, the reactive toughening agent forms a stable solution in a good solvent, which helps to avoid its existence as undissolved particles or agglomerates in the subsequent coating system; then adding the leveling agent and photoinitiator allows the auxiliary components to be distributed in the solution system first; subsequently adding the auxiliary resin and the main resin ensures that the reactive toughening agent maintains its initial compatibility in the resin system. Specifically, the toughening agent is first added to the solvent and stirred at 90℃ and 300rpm for 10min. After the solution returns to room temperature, 0.05g of leveling agent and 0.3g of photoinitiator are added and stirred at 200rpm for 10min. Then, the auxiliary resin is added and stirred, and finally, the main resin is added and stirred to obtain the anti-glare coating. The method for preparing the anti-glare film includes providing the aforementioned anti-glare coating, applying it to the surface of a transparent substrate 100 to form a wet coating, baking the wet coating to evaporate the solvent and induce phase separation of the reactive toughening agent to form an island structure on the coating surface, and then UV curing the baked coating to fix the island structure, thereby obtaining the anti-glare film. The coating step is used to form a wet film of a predetermined thickness on the surface of the transparent substrate 100; the baking process is used for solvent evaporation, changes in wet film viscosity and compatibility, and is a key step in inducing phase separation of the reactive toughening agent; UV curing is used to crosslink the main resin and auxiliary resin to form a film and fix the surface structure formed after phase separation. The difference between this application and typical coating and curing processes is that the baking process is not only used to remove the solvent, but also to trigger compatibility changes between the reactive toughening agent and the high-density polyethylene graft-modified main and auxiliary resins, causing them to form an anti-glare island structure; UV curing is not only used to form a hardened layer, but also to fix the already formed or forming island structure.

[0035] The transparent substrate 100 can be a PMMA substrate, or PET, PC, TAC, COP, glass, or other light-transmitting substrates can be selected according to the needs of the optical film for display. Specifically, a 40μm PMMA substrate is used, and OPS bar coating is used. The anti-glare coating is suitable for forming a thin anti-glare coating on the transparent optical substrate. The thickness of the anti-glare coating 200 can be 3μm to 6μm. Too thin a thickness may not be conducive to the formation of a complete cured coating and surface structure, while too thick a thickness may affect transmittance, haze, and coating drying uniformity.

[0036] The anti-glare film includes a transparent substrate 100 and an anti-glare coating 200 disposed on one side of the transparent substrate 100. The anti-glare coating 200 is formed by curing the aforementioned anti-glare coating, and its surface has an island structure formed by phase separation of a reactive toughening agent. This island structure can be understood as a microscopic surface structure composed of a continuous resin phase and a dispersed toughening agent phase, wherein the continuous resin phase is mainly formed by curing a main resin and a secondary resin, and the dispersed phase is mainly formed by phase separation of a reactive toughening agent during the drying process.

[0037] The resulting anti-glare film can be used in display devices, which include a display panel and an anti-glare film disposed on the light-emitting side of the display panel. The display panel can be a liquid crystal display panel, an organic light-emitting display panel, a Mini LED display panel, an automotive display, a touch display, or other display panels that require reduced ambient light reflection glare. The anti-glare film can be directly disposed on the light-emitting side of the display panel, or it can be disposed on the outside of a cover plate, polarizer, touch layer, or other optical layer. This application method corresponds to the technical purpose of using anti-glare films to reduce ambient light reflection glare on display surfaces. With the widespread use of electronic displays, the reflected glare from ambient light on the screen surface reduces image contrast and color saturation, and causes visual fatigue. The anti-glare layer uses a surface island structure to reflect light in different directions, thereby achieving an anti-glare effect. Therefore, the anti-glare film is disposed on the light-emitting side of the display panel. Specific Implementation The following will further introduce some specific implementation methods to provide a more detailed explanation of the technical solution of this application.

[0039] Example 1 First, add 1g of toughening agent to 17.5g of solvent and stir at 90℃ and 300rpm for 10min. After the solution returns to room temperature, add 0.05g of leveling agent and 0.3g of photoinitiator, and stir at 200rpm for 10min. Then add 1.5g of auxiliary resin and stir at 300rpm for 10min. Finally, add 6g of main resin and stir at 300rpm for 10min to obtain the anti-glare coating. Apply the coating to a 40μm PMMA substrate using an OPS bar. After curing the coated film at 95℃ for 1min, irradiate it with UV light at 30mW / cm² intensity for 10s to obtain the target anti-glare coating.

[0040] Example 2 First, add 0.5g of toughening agent to 17.5g of solvent and stir at 90℃ and 300rpm for 10min. After the solution returns to room temperature, add 0.05g of leveling agent and 0.3g of photoinitiator, and stir at 200rpm for 10min. Then add 1.5g of auxiliary resin and stir at 300rpm for 10min. Finally, add 6g of main resin and stir at 300rpm for 10min to obtain the anti-glare coating. Apply the coating to a 40μm PMMA substrate using an OPS bar. After curing the coated film at 95℃ for 1min, irradiate it with UV light at 30mW / cm² intensity for 10s to obtain the target anti-glare coating.

[0041] Example 3 First, 1.5g of toughening agent was added to 17.5g of solvent and stirred at 90℃ and 300rpm for 10min. After the solution returned to room temperature, 0.05g of leveling agent and 0.3g of photoinitiator were added and stirred at 200rpm for 10min. Then, 1.5g of auxiliary resin was added and stirred at 300rpm for 10min. Finally, 6g of main resin was added and stirred at 300rpm for 10min to obtain the anti-glare coating. This coating was applied to a 40μm PMMA substrate using an OPS bar. The coated film was cured at 95℃ for 1min and then irradiated with UV light at 30mW / cm² intensity for 10s to obtain the target anti-glare coating.

[0042] Example 4 First, add 1g of toughening agent to 17.5g of solvent and stir at 90℃ and 300rpm for 10min. After the solution returns to room temperature, add 0.05g of leveling agent and 0.3g of photoinitiator, and stir at 200rpm for 10min. Then add 2.5g of auxiliary resin and stir at 300rpm for 10min. Finally, add 5g of main resin and stir at 300rpm for 10min to obtain the anti-glare coating. Apply the coating to a 40μm PMMA substrate using an OPS bar. After curing the coated film at 95℃ for 1min, irradiate it with UV light at 30mW / cm² intensity for 10s to obtain the target anti-glare coating.

[0043] Example 5 First, add 1g of toughening agent to 17.5g of solvent and stir at 90℃ and 300rpm for 10min. After the solution returns to room temperature, add 0.05g of leveling agent and 0.3g of photoinitiator, and stir at 200rpm for 10min. Then add 0.5g of auxiliary resin and stir at 300rpm for 10min. Finally, add 7g of main resin and stir at 300rpm for 10min to obtain the anti-glare coating. Apply the coating to a 40μm PMMA substrate using an OPS bar. After curing the coated film at 95℃ for 1min, irradiate it with UV light at 30mW / cm² intensity for 10s to obtain the target anti-glare coating.

[0044] Comparative Example 1 Add 0.05g of leveling agent and 0.3g of photoinitiator to 17.5g of solvent, and stir at 200rpm for 10min. Then add 1.5g of auxiliary resin and stir at 300rpm for 10min. Finally, add 6g of main resin and stir at 300rpm for 10min to obtain an anti-glare coating. Apply the coating to a 40μm PMMA substrate using an OPS bar. After curing the coated film at 95℃ for 1min, irradiate with UV light at 30mW / cm² for 10s to obtain the target anti-glare coating.

[0045] Comparative Example 2 First, add 1g of toughening agent to 17.5g of solvent and stir at 90℃ and 300rpm for 10min. After the solution returns to room temperature, add 0.05g of leveling agent and 0.3g of photoinitiator, and stir at 200rpm for 10min. Then add 7.5g of main resin and stir at 300rpm for 10min to obtain an anti-glare coating. Apply the coating to a 40μm PMMA substrate using an OPS bar. After curing the coated film at 95℃ for 1min, irradiate it with UV light at 30mW / cm² intensity for 10s to obtain the target anti-glare coating.

[0046] Comparative Example 3 First, add 1g of toughening agent to 17.5g of solvent and stir at 90℃ and 300rpm for 10min. After the solution returns to room temperature, add 0.05g of leveling agent and 0.3g of photoinitiator, and stir at 200rpm for 10min. Then add 7.5g of auxiliary resin and stir at 300rpm for 10min to obtain an anti-glare coating. Apply the coating to a 40μm PMMA substrate using an OPS bar. After curing the coated film at 95℃ for 1min, irradiate it with UV light at 30mW / cm² intensity for 10s to obtain the target anti-glare coating.

[0047] Tests were conducted on various embodiments and comparative examples, including transmittance, haze, gloss, clarity, steel wool resistance, and cross-cut adhesion test. In this invention, the haze of the coating film was tested according to JIS K 7136:2000 "Determination of Haze in Plastics and Transparent Materials"; the transmittance of the coating film was tested according to JIS K7361-1 "Determination of Total Luminous Transmittance in Plastic Products and Transparent Materials"; the adhesion was tested according to GB 1720-1979 "Test Method for Adhesion of Paint Films"; the abrasion resistance of the coating film was tested according to HG / T 4303-2012 "Test Method for Abrasion Resistance of Surface-Hardened Polyester Films," using 0000# steel wool and a load of 500 gf / cm². The abrasion resistance was determined by detecting the number of scratches on the coating film surface; fewer scratches indicate better abrasion resistance. The gloss of the coating film at 60° was tested according to ASTM D2457-13 "Standard Test Method for Specular Gloss of Plastic Films and Solid Plastics." The clarity of the coating film was tested according to the standard JIS K 7374:2007 "Plastics, determination of image sharpness".

[0048] The test results are summarized in Table 1.

[0049] Table 1 shows the test results for each specific implementation method.

[0050] The test results of the embodiments and comparative examples of this application show that by adjusting the ratio of the main resin to the auxiliary resin and the amount of toughening agent added, anti-glare coatings with different haze and gloss can be obtained, which can be applied to the three anti-glare categories of AG1, AG2 and AG3.

[0051] Increasing the toughening agent content helps to form a surface "island" structure, which can slightly increase the coating haze and effectively reduce the coating gloss (Example 1, Example 2, Example 3, Comparative Example 1). However, since its own wear resistance is relatively weaker than that of the resin, adding too much will also lead to a decrease in the overall wear resistance of the coating (Example 1, Example 3).

[0052] When the total mass of the main resin and auxiliary resin is constant, increasing the content of auxiliary resin significantly improves the haze (Examples 1, 4, 5, Comparative Example 2, and Comparative Example 3). This is because the refractive indices of the PMMA substrate and the main resin are similar, and light passing through the interface after coating undergoes almost no refraction, resulting in very weak scattering and lower coating haze. Adding an auxiliary resin with a refractive index that deviates from that of the main resin creates a difference in the overall refractive index of the coating liquid, leading to increased scattering at the interface and an overall increase in haze. Furthermore, since the auxiliary resin bonds better to the substrate than the main resin, a low proportion of auxiliary resin will result in a poorer overall cross-linking of the coating. Simultaneously, because the functionality of the auxiliary resin is lower than that of the main resin, its cross-linking density after UV curing is lower, resulting in poorer abrasion resistance than the main resin. Increasing the proportion of auxiliary resin will worsen the overall abrasion resistance of the coating (Examples 1, 5, and Comparative Example 2). When the content of the main resin is too low, the main resin cannot provide good phase separation conditions for the toughening agent during the thermosetting stage, resulting in a decrease in the amount of toughening agent precipitated, a significant reduction in the "island" structure on the coating surface, and a significant increase in coating gloss (Example 1, Comparative Example 3).

[0053] As described above, this application relates to the formation of the anti-glare structure in an anti-glare film for displays, and provides an anti-glare coating, a method for preparing the anti-glare coating, an anti-glare film, and a display device. The anti-glare coating includes a main resin, an auxiliary resin, a solvent, a reactive toughening agent, a leveling agent, and a photoinitiator. The main resin is a high-density polyethylene grafted modified polyurethane acrylate resin, and the auxiliary resin is a high-density polyethylene grafted modified polyester acrylate resin. The reactive toughening agent contains non-polar segments and polar reactive groups, which enable it to remain compatible or dispersed with the resin system during the formulation stage, and to undergo phase separation during the drying process after coating due to solvent evaporation and changes in system compatibility, thereby forming an island structure on the coating surface for scattering incident light.

[0054] By controlling the ratio of main resin, auxiliary resin, and reactive toughening agent, and through steps such as solvent dissolution and dispersion, baking-induced phase separation, and UV curing, an anti-glare coating with a thickness of 3μm to 6μm can be formed on the surface of a transparent substrate. This method does not require silica particles, organic microspheres, or imprinting molds as necessary conditions for forming the anti-glare uneven structure. It provides a structural formation path for anti-glare films based on resin compatibility control and reactive toughening agent phase separation, and is suitable for application on the light-emitting side of display panels to reduce ambient light reflection glare.

[0055] The above is only one specific implementation of this application, and any other improvements made based on the concept of this application shall be considered within the scope of protection of this application.

Claims

1. An anti-glare coating, characterized in that, Including main resin, auxiliary resin, solvent, reactive toughening agent, leveling agent and photoinitiator; The main resin includes high-density polyethylene grafted and modified polyurethane acrylate resin, and the auxiliary resin includes high-density polyethylene grafted and modified polyester acrylate resin. The reactive toughening agent contains nonpolar segments and polar reactive groups. The nonpolar segments are compatible with the high-density polyethylene graft portion in the main resin and / or the auxiliary resin, and the polar reactive groups are compatible with the polyurethane acrylate resin and / or the polyester acrylate resin. The reactive toughening agent undergoes phase separation due to reduced compatibility with the oligomers formed by the reaction with the main resin and / or the auxiliary resin, thereby forming an island structure on the surface of the cured coating for anti-glare purposes.

2. The anti-glare coating according to claim 1, characterized in that, The main resin is a high-density polyethylene grafted with polyurethane acrylate resin with ≥hexafunctionality, and the refractive index of the main resin is in the range of 1.48 to 1.

50. The auxiliary resin is a high-density polyethylene grafted and modified polyester acrylate resin with ≤trifunctionality, and the refractive index of the auxiliary resin is in the range of 1.45 to 1.

47.

3. The anti-glare coating according to claim 1, characterized in that, The mass ratio of the main resin, the auxiliary resin, and the reactive toughening agent is (5-7):(0.5-2.5):(0.5-1.5).

4. The anti-glare coating according to claim 1, characterized in that, The reactive toughening agent includes an elastomer toughening agent containing at least one polar reactive group selected from epoxy, acid anhydride, ester and carboxyl groups.

5. The anti-glare coating according to claim 4, characterized in that, The reactive toughening agent includes one or more of the following: ethylene-butyl acrylate-glycidyl methacrylate copolymer, polyolefin elastomer grafted with glycidyl methacrylate, polyolefin elastomer grafted with maleic anhydride, ethylene-methacrylate-glycidyl methacrylate copolymer, epoxy-based polyolefin elastomer, thermoplastic polyester elastomer, and maleic anhydride grafted with styrene-ethylene-butene-styrene block copolymer.

6. The anti-glare coating according to claim 1, characterized in that, The solvent is a good solvent or a mixed solvent that can dissolve the reactive toughening agent under heating conditions and prevent the reactive toughening agent from crystallizing after cooling to room temperature; And / or, the anti-glare coating does not contain silica particles or organic microspheres used to form the anti-glare textured structure.

7. A method for preparing an anti-glare coating according to any one of claims 1 to 6, characterized in that, include: A reactive toughening agent is added to a solvent and heated and stirred to obtain a toughening agent solution. After cooling the toughening agent solution, add the leveling agent and photoinitiator and stir. Add the auxiliary resin and stir; Add the main resin and stir to obtain the anti-glare coating.

8. A method for preparing an anti-glare film, characterized in that, include: Provide an anti-glare coating according to any one of claims 1 to 6, or prepare an anti-glare coating using the preparation method described in claim 7; The anti-glare coating is applied to the surface of a transparent substrate to form a wet coating. The wet coating is baked to evaporate the solvent and induce phase separation of the reactive toughening agent to form an island structure on the coating surface. The coating after baking is UV cured to fix the island structure and obtain an anti-glare film.

9. An anti-glare film, characterized in that, It includes a transparent substrate and an anti-glare coating disposed on one side of the transparent substrate, wherein the anti-glare coating is formed by curing the anti-glare coating according to any one of claims 1 to 6; The surface of the anti-glare coating has an island structure formed by phase separation of the reactive toughening agent, and the thickness of the anti-glare coating is in the range of 3μm to 6μm.

10. A display device, characterized in that, It includes a display panel and the anti-glare film of claim 9 disposed on the light-emitting side of the display panel.

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