Antiglare optical film and antiglare antiglare optical film for pmma substrate

Abstract

The application relates to an anti-glare coating composition suitable for a PMMA substrate and an anti-glare optical film, the coating composition comprising the following components in parts by weight: 10-50 parts by weight of multifunctional polyurethane acrylate; 10-30 parts by weight of acrylate monomer; 3-20 parts by weight of anti-glare particles; 10-20 parts by weight of surface-activated hollow silica particles; 2-10 parts by weight of photoinitiator; 40-80 parts by weight of a solvent system; and 1-3 parts by weight of functional additives. The anti-glare optical film prepared from the coating composition has a surface roughness Ra of less than 0.2 mu m, extremely low surface reflectivity and good anti-glare effect.

Description

Technical Field

[0002] This application belongs to the technical field of anti-glare coating composition, and particularly relates to an anti-glare coating composition, an anti-glare optical film, and an anti-glare polarizer. Background Technology

[0004] With the rapid development of display technology, displays (such as OLED and LCD displays) have been widely used in mobile phones, tablets, monitors, and wearable devices. Existing displays typically have a polarizer on their outermost layer to suppress ambient light reflection and improve display contrast. A polarizer, also known as a light polarizer, allows specific polarized light waves to pass through while blocking other polarized light waves. It is a composite thin-film structure composed of multiple layers. The polarizer is the core optical film material of the display panel, controlling the polarization direction of a specific light beam to convert natural light into linearly or circularly polarized light, enabling the screen to display images and improving image clarity.

[0005] However, in real-world usage environments, monitors are inevitably exposed to external light sources. This external light reflects off the monitor surface, easily creating glare or reflected images, significantly reducing the readability and visual appeal of the displayed image. Especially in strong light environments, surface reflections can severely impact the viewing experience, causing glare and reducing image contrast. Current technologies typically address glare issues by adding a separate anti-glare (AG) film.

[0006] Anti-glare film is typically laminated onto the surface of a display screen. Its finely textured surface causes diffuse reflection of incident light, thus eliminating glare. However, this configuration increases the number of film layers in the display panel, increasing its thickness, which contradicts the trend towards thinner display panels. Furthermore, the addition of anti-glare film makes it difficult to adjust its compatibility with other layers, such as polarizers. Current customer feedback indicates that existing technologies often result in high reflectivity and poor color uniformity, potentially leading to localized blurring in the final display.

[0007] Therefore, it is of great significance to develop a coating composition and optical film that can bond well with PMMA substrates, add anti-glare properties to the function of polarizers, and serve as a substrate film coating for polarizers. Currently, no effective solution has been provided in the prior art to address the above-mentioned problems, hence this invention. Summary of the Invention

[0009] This application provides an anti-glare coating composition, which solves the technical problems in the prior art, such as the display panel generating reflections, which easily form glare or reflected images, as well as the problems in the prior art, such as the anti-glare film increasing the thickness of the display panel, difficulty in matching with existing film layers, poor adhesion between the anti-glare coating and the PMMA substrate, and difficulty in balancing hardness and anti-glare effect.

[0010] In a first aspect, embodiments of this application provide an anti-glare coating composition suitable for PMMA substrates, the coating composition comprising, by weight parts: Multifunctional polyurethane acrylate, 10-50 parts by weight; 10-30 parts by weight of acrylate monomer; Anti-glare particles: 3-20 parts by weight; 10-20 parts by weight of surface-activated hollow silica particles; Photoinitiator 2-10 parts by weight; Solvent system: 40-80 parts by weight; Functional additives, 1-3 parts by weight.

[0011] In a preferred embodiment, the multifunctional polyurethane acrylate in the anti-glare coating composition has a functionality greater than 5, and the coating composition comprises, by weight parts: 10-40 parts by weight of multifunctional polyurethane acrylate; 10-30 parts by weight of acrylate monomer; Anti-glare particles: 3-10 parts by weight; 10-15 parts by weight of surface-activated hollow silica particles; Photoinitiator 2-10 parts by weight; Solvent system: 40-80 parts by weight; Functional additives, 1-3 parts by weight.

[0012] Preferably, the coating composition comprises, by weight parts: Multifunctional polyurethane acrylate, 10-30 parts by weight; 10-20 parts by weight of acrylate monomer; Anti-glare particles: 3-15 parts by weight; 10-15 parts by weight of surface-activated hollow silica particles; Photoinitiator 2-8 parts by weight; Solvent system: 40-80 parts by weight; Functional additives, 1-3 parts by weight; Preferably, the coating composition comprises, by weight parts: Multifunctional polyurethane acrylate, 10-30 parts by weight; 20-30 parts by weight of acrylate monomer; Anti-glare particles: 3-10 parts by weight; 10-15 parts by weight of surface-activated hollow silica particles; Photoinitiator 2-8 parts by weight; Solvent system 50-80 parts by weight; Functional additives, 1-3 parts by weight.

[0013] The anti-glare particles are at least one of silica inorganic particles, PMMA particles, PS particles, and melamine particles.

[0014] Preferably, the average particle size of the anti-glare particles is 2-8 μm.

[0015] Preferably, the average particle size of the hollow silica particles is 50nm-500nm.

[0016] Preferably, the hollow silica particles are activated by plasma for 30 minutes before being added to the anti-glare coating composition; the surface energy of the hollow silica particles is 40 mN / m - 70 mN / m.

[0017] Preferably, the photoinitiator is one or a combination of 2-hydroxy-2-methyl-1-phenyl ketone (1173), 1-hydroxycyclohexyl-phenyl ketone (184), 2-methyl-1-{(4-methylthio)phenyl}-2-morpholino-1-propanone (907), 2,4,6-trimethylbenzoylbenzene-diphenylphosphine oxide (TPO), bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide (819), and 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-1-butanone (369).

[0018] Preferably, the solvent system is one or more combinations of n-hexane, n-heptane, cyclohexane, petroleum ether, ethylene glycol, deionized water, and propylene glycol methyl ether.

[0019] Preferably, the functional additives include leveling agents, wetting and dispersing agents, defoamers, and light stabilizers; the leveling agent is an organic modified siloxane; the wetting and dispersing agent is an alkynyl alcohol; the defoamer is a polyether-modified polydimethylsiloxane; and the light stabilizer is a benzotriazole or triazine.

[0020] Secondly, embodiments of this application provide an anti-glare optical film, comprising a PMMA substrate layer and an anti-glare coating attached to one side surface of the PMMA substrate layer. The anti-glare coating is formed by coating the PMMA substrate with an anti-glare coating composition, wherein the anti-glare coating composition is the anti-glare coating composition described above, the thickness of the substrate is 20-150 μm, and the thickness of the anti-glare coating is 2.0-10.0 μm.

[0021] Preferably, the thickness of the PMMA substrate layer is 35-95 μm, or 40 μm, 60 μm, 80 μm, or 90 μm; Preferably, the thickness of the anti-glare coating is 2-6 μm, or 2.0 μm, 3.0 μm, 4.0 μm, 5.0 μm, or 6.0 μm.

[0022] Preferably, the reflectivity of the anti-glare optical film is less than 2.0%; more preferably, the reflectivity is less than 1.5% or less than 1.2%.

[0023] Preferably, the warpage of the anti-glare optical film is less than 3.5 μm; preferably, the warpage of the anti-glare optical film is less than 3.0 μm, or less than 2.0 μm or 2.5 μm. Preferably, the surface hardness of the anti-glare optical film on one side of the anti-glare coating is not less than 3H; preferably, the surface hardness of the anti-glare optical film on one side of the anti-glare coating is not less than 4H or 5H.

[0024] Preferably, the cross-cut adhesion test result of the anti-glare optical film on one side surface of the anti-glare coating is not less than 4B.

[0025] Thirdly, embodiments of this application provide a method for preparing an anti-glare optical film, the method comprising the following steps: (S1) Apply the above-described anti-glare coating composition to the PMMA substrate using a slot coating, roller coating, spray coating or scraping method to form a PMMA substrate wet film adhesion intermediate; (S2) The PMMA substrate wet film attachment intermediate is moved into a cavity with an electric field for particle migration and curing treatment. (S3) The cured PMMA substrate wet film attachment intermediate is subjected to ultraviolet curing to obtain the anti-glare optical film.

[0026] Fourthly, embodiments of this application provide an anti-glare polarizer, the polarizer comprising: First optical film; Second optical film; A PVA core layer is disposed between the first optical film and the second optical film, and at least one of the first optical film and the second optical film is the anti-glare optical film described above, wherein the PVA core layer is attached to the surface of the anti-glare optical film away from the anti-glare coating.

[0027] This invention provides an anti-glare coating composition and its preparation method. The resulting anti-glare optical film and anti-glare polarizer, prepared by using a specific ratio of multifunctional polyurethane acrylate, acrylate monomers, anti-glare particles, and surface-activated hollow silica particles, exhibit a surface roughness Ra of less than 0.2 μm, extremely low reflectivity, and excellent anti-glare effect. Tests demonstrate that the prepared anti-glare optical film coating composition has excellent adhesion to PMMA substrates, achieving a cross-cut adhesion test result of 4B or higher.

[0028] The technical solution of this invention introduces surface-activated hollow silica particles, which not only reduces the density and refractive index of the coating and effectively reduces the reflectivity of the optical film (to less than 1.2%), but also helps to improve the anti-glare effect and hardness of the coating due to its unique hollow structure and hollow characteristics.

[0029] The anti-glare optical film of the present invention achieves excellent anti-glare performance, with a surface hardness of 5H or higher, low warpage (less than 2.0 μm), and good dimensional stability.

[0030] In the preparation method of the present invention, the particle migration step assisted by the electric field can make the anti-glare particles and hollow silica particles more uniformly distributed in the coating. Furthermore, the hollow silica particles on the side of the coating away from the PMMA substrate have the effect of reducing reflection and increasing light transmission. While avoiding glare, they also reduce light reflection, further optimizing optical performance and surface morphology, and improving user experience. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the display panel structure using the anti-glare coating composition according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the anti-glare optical film according to an embodiment of the present invention; Figure 3 This is another structural schematic diagram of the anti-glare optical film provided in the embodiments of this application; Figure 4A flowchart illustrating the specific process for preparing an anti-glare optical film from the anti-glare coating composition provided in this application embodiment.

[0034] Figure 5 A schematic diagram of the cross-sectional structure of the polarizer prepared by the anti-glare optical film according to an embodiment of the present invention; Figure 6 Another schematic diagram of the structure of the polarizer prepared from the anti-glare optical film provided in the embodiments of this application. Detailed Implementation

[0036] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0037] like Figure 1 As shown, common display panels in the prior art include OLED displays, LCD displays, and MicroLED displays, all of which are generally equipped with polarizers. OLED panels consist of a TFT substrate, an OLED, and a cathode electrode. The electrodes typically use highly conductive metal materials, which have very high reflectivity. Therefore, under direct sunlight outdoors, the panel struggles to display a clear image. Using polarizers can significantly improve the outdoor visibility of OLED displays and is currently a standard feature. However, in practical applications, especially for high-resolution display panels, visibility issues still exist under strong outdoor light.

[0038] It should be noted that the length direction of the display panel is designated as the first direction DR1, the height direction as the second direction DR2, and the width direction as the third direction DR3. The third direction DR3 is the normal direction of the plane defined by the first direction DR1 and the second direction DR2. The directions indicated by the first to third directions DR1, DR2, and DR3 described in this specification are relative concepts and can be changed to other directions.

[0039] Taking the S-area of ​​a display panel as an example, this invention illustrates the application scenarios of the anti-glare optical film provided in specific embodiments. Figure 2As shown in the illustration, a specific embodiment of the present invention provides an anti-glare optical film, comprising a PMMA substrate layer 10 and an anti-glare coating 20 attached to one side surface of the PMMA substrate layer. The anti-glare coating 20 is formed by coating an anti-glare paint composition onto the PMMA substrate, the substrate having a thickness of 20-150 μm; and the anti-glare coating having a thickness of 2.0-10.0 μm. Experiments have confirmed that the anti-glare optical film formed by coating the PMMA substrate with the anti-glare paint composition has a surface reflectance of less than 2.0%; preferably, the reflectance is less than 1.5%, or less than 1.2%. This anti-glare optical film offers superior anti-glare performance and extremely low reflectance compared to ordinary anti-glare films, reducing ambient light interference under strong light and high-definition resolutions, especially 1080p and above, resulting in excellent display performance. When ambient light interference is reduced, screen contrast is improved, and dark details such as text edges and object highlights become sharper. This visual "transparency" makes the image appear clearer to the user.

[0040] The specific technical solution of this invention is as follows: Figure 3 As shown, the anti-glare optical film includes a PMMA substrate layer 10 and an anti-glare coating 20 attached to one side surface of the PMMA substrate layer. The anti-glare coating 20 includes a first sub-layer 21 and a second sub-layer 22. The first sub-layer is an anti-reflection coating, and the second sub-layer is disposed on the side of the first sub-layer close to the PMMA substrate layer. The first sub-layer is mainly an anti-reflection coating of hollow silica particles; the second sub-layer is mainly an intermediate coating of anti-glare particles. The anti-glare coating of the present invention includes a first sub-layer and a second sub-layer, in which hollow silica (SiO2) nanoparticles are used as functional fillers and uniformly dispersed in a photocurable coating (adhesive). These nanoparticles form the first sub-layer on the surface of the cured film. Due to the matching relationship between the low refractive index and high refractive index of the hollow silica (SiO2) nanoparticles and the surrounding adhesive, the reflected light will interfere destructively when incident light enters the first sub-layer, thereby directly canceling out most of the reflected light on the side surface of the first sub-layer away from the PMMA substrate layer at a physical level, thus greatly improving the anti-reflection effect of the display panel. The use of anti-glare particles in the second sub-layer can reduce reflected glare inside the display panel and interface reflections between different film layers far from the anti-glare coating, making the overall display effect more outstanding, especially suitable for OLED display panels.

[0041] In the specific technical solution of this invention, the thickness of the PMMA substrate layer is preferably 35-95 μm, or 40 μm, 60 μm, 80 μm, or 90 μm. The thickness of the PMMA substrate layer can be selected according to customer needs, and a thinner or thicker substrate can be chosen.

[0042] In the specific technical solution of the present invention, the thickness of the anti-glare coating is preferably 2-6 μm, or 2.0 μm, 3.0 μm, 4.0 μm, 5.0 μm, or 6.0 μm.

[0043] In the specific technical solution of the present invention, the reflectivity of the anti-glare optical film on the anti-glare coating side is less than 2.0%; preferably, the reflectivity of the anti-glare optical film on the anti-glare coating side is less than 1.5% or less than 1.2%; thus, the reflectivity can be adjusted according to the specific needs of the customer.

[0044] In the specific technical solution of the present invention, the warpage of the anti-glare optical film is less than 3.5 μm; preferably, the warpage of the anti-glare optical film is less than 3.0 μm, or less than 2.0 μm or 2.5 μm. In the specific technical solution of the present invention, the surface hardness of the anti-glare optical film on one side of the anti-glare coating is not less than 3H; preferably, the surface hardness of the anti-glare optical film on one side of the anti-glare coating is not less than 4H or 5H.

[0045] In the specific technical solution of the present invention, the cross-cut test result of the anti-glare optical film on one side surface of the anti-glare coating is not less than 4B.

[0046] like Figure 4 As shown, the preparation process of the anti-glare optical film of the present invention specifically includes the following steps: (S1) Apply the anti-glare coating composition to the PMMA substrate using a slot coating, roller coating, spray coating or scraping method to form a PMMA substrate wet film adhesion intermediate; (S2) The PMMA substrate wet film attachment intermediate is moved into a cavity with an electric field for particle migration and curing treatment. (S3) The cured PMMA substrate wet film attachment intermediate is subjected to ultraviolet curing to obtain the anti-glare optical film.

[0047] The specific (S2) steps include: (S21) The PMMA substrate wet film is operated at a preset speed and preset temperature so that the anti-glare particles in the wet film settle to the side of the wet film close to the PMMA substrate. (S22) Based on the surface activity of the surface-activated hollow silica particles in the PMMA substrate wet film, an electric field environment is added during the running stroke of the PMMA substrate wet film, so that the surface-activated hollow silica particles migrate away from the PMMA substrate.

[0048] <Anti-glare coating composition section> The specific technical solution of this invention provides an anti-glare coating composition suitable for PMMA substrates, characterized in that the coating composition comprises, by weight parts: 10-50 parts by weight of multifunctional polyurethane acrylate; 10-30 parts by weight of acrylate monomer; 3-20 parts by weight of anti-glare particles; 10-20 parts by weight of surface-activated hollow silica particles; 2-10 parts by weight of photoinitiator; 40-80 parts by weight of solvent system; and 1-3 parts by weight of functional additives.

[0049] This invention uses micron-sized anti-glare particles and nano-sized surface-activated hollow silica particles as an anti-glare coating composition. The micron-sized and nano-sized particles work synergistically, allowing the nano-sized particles to accumulate on the surface of the adhesive layer to form a first sublayer, thus increasing light transmittance, while the micron-sized particles settle to form a second sublayer, thus reducing glare. The first sublayer, due to the low refractive index of the hollow silica particles, is assembled into a low-refractive-index structure, while the adhesive layer has a high refractive index, reducing surface reflection of the anti-glare optical film. Furthermore, the second sublayer prevents the formation of bright or dark spots, or streaks, moiré patterns, or other particle patterns on the surface of the anti-glare optical film. This improves the surface clarity of the anti-glare film and enhances the visibility of images on displays equipped with the anti-glare film.

[0050] In the specific technical solution of this invention, the multifunctional polyurethane acrylate in the anti-glare coating composition has a functionality greater than 5, and the coating composition comprises, by weight parts: 10-40 parts by weight of multifunctional polyurethane acrylate; 10-30 parts by weight of acrylate monomer; 3-10 parts by weight of anti-glare particles; 10-15 parts by weight of surface-activated hollow silica particles; 2-10 parts by weight of photoinitiator; 40-80 parts by weight of solvent system; and 1-3 parts by weight of functional additives.

[0051] In the specific technical solution of this invention, the average particle size of the hollow silica particles is 50nm-500nm. The refractive index of the hollow silica particles is between 1.15 and 1.30, and the refractive index of the particle-free adhesive layer is between 1.40 and 1.65. Due to the formation of a structure with a matching low and high refractive index in the first sublayer, its reflectivity is less than 2.0%. The refractive index of the adhesive can be adjusted according to the user's needs, so that the reflectivity of the anti-glare optical film on the anti-glare coating side is less than 1.5% or less than 1.2%.

[0052] In this invention, unless otherwise specified, "refractive index" refers to the refractive index at a wavelength of 550 nm. Furthermore, the method for measuring the refractive index is not particularly limited in this invention; however, in the case of the refractive index of minute substances such as particles, the Beck method can be used, for example, for measurement.

[0053] In the specific technical solution of this invention, the coating composition comprises, by weight parts: 10-30 parts by weight of multifunctional polyurethane acrylate; 10-20 parts by weight of acrylate monomer; 3-15 parts by weight of anti-glare particles; 10-15 parts by weight of surface-activated hollow silica particles; 2-8 parts by weight of photoinitiator; 40-80 parts by weight of solvent system; and 1-3 parts by weight of functional additives.

[0054] In the specific technical solution of this invention, the average particle size of the anti-glare particles is 2-8 μm. The ratio of the standard deviation of the particle size distribution to the particle size is ≤ 0.1 to prevent the formation of special bright and dark spots due to individual large particles. In the specific technical solution of this invention, the anti-glare particles are at least one of silica inorganic particles, PMMA particles, PS particles, and melamine particles. The refractive index difference between the anti-glare particles and the resin matrix is ​​controlled within 0.3 to avoid excessive haze caused by interface scattering due to excessive refractive index difference. The surface haze of the anti-glare optical film on one side of the anti-glare coating is in the range of 1%-5%; preferably, the surface haze of the anti-glare optical film on one side of the anti-glare coating is in the range of 1%-4%, and more preferably, the surface haze of the anti-glare optical film on one side of the anti-glare coating is in the range of 1%-3%. Preferably, the surface haze of the anti-glare optical film on one side of the anti-glare coating is 1%, 2%, 3%, 4%, or 5%.

[0055] In the specific technical solution of this invention, the coating composition comprises, by weight parts: 10-30 parts by weight of multifunctional polyurethane acrylate; 20-30 parts by weight of acrylate monomer; 3-10 parts by weight of anti-glare particles; 10-15 parts by weight of surface-activated hollow silica particles; 2-8 parts by weight of photoinitiator; 50-80 parts by weight of solvent system; and 1-3 parts by weight of functional additives.

[0056] In the specific technical solution of the present invention, the hollow silica particles are activated by plasma for 30 minutes and then added to the anti-glare coating composition; the surface energy of the hollow silica particles is 40 mN / m - 70 mN / m.

[0057] Specifically, the technical solution of the present invention activates the surface of hollow silica particles (SiO2) with plasma, mainly by introducing highly active functional groups (such as hydroxyl-OH, amino-NH2, etc.) to enhance the negative charge or make them positively charged, thereby providing a technical basis for the formation of the first sublayer of hollow silica particles (SiO2) on the surface of the adhesive layer.

[0058] The specific activation steps include: (S11) Disperse the hollow silica particles evenly or place them in the vacuum chamber of the plasma processing equipment. Introduce the working gas, preferably pure oxygen (O2).

[0059] (S12) The gas in the cavity is excited by a high-frequency electric field through a radio frequency power supply (such as 40kHz or 13.56MHz frequency), causing the gas molecules to ionize and generate a plasma containing high-energy electrons, positive and negative ions, excited-state molecules and a large number of highly active free radicals.

[0060] (S13) Under the influence of an electric field or concentration gradient, high-energy particles in the plasma accelerate and collide with the surface of hollow silica particles.

[0061] (S14) causes the original chemical bonds (such as Si-O, Si-Si, etc.) on the silicon dioxide surface to break under the bombardment of high-energy particles in the plasma, generating unstable "dangling bonds". The highly reactive free radicals in the plasma will react chemically with these dangling bonds, and oxygen plasma activation: oxygen free radicals react with hydrocarbon contaminants on the surface to generate CO2 and H2O, which volatilize, while a large number of silanol groups (Si-OH) are generated on the surface.

[0062] (S15) After physical etching and chemical reaction, the decomposed volatile products will be promptly removed from the reaction chamber by the vacuum system to ensure that the surface of the activated hollow silica particles remains clean and highly active.

[0063] Through the above steps, the surface of the hollow silica particles can be efficiently activated, and the surface energy of the hollow silica particles is measured to be 40 mN / m - 70 mN / m.

[0064] In the specific technical solution of this invention, the photoinitiator is one or a combination of 2-hydroxy-2-methyl-1-phenyl ketone (1173), 1-hydroxycyclohexyl-phenyl ketone (184), 2-methyl-1-{(4-methylthio)phenyl}-2-morpholino-1-propanone (907), 2,4,6-trimethylbenzoylbenzene-diphenylphosphine oxide (TPO), bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide (819), and 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-1-butanone (369).

[0065] In the specific technical solution of this invention, the solvent system is one or more combinations of n-hexane, n-heptane, cyclohexane, petroleum ether, ethylene glycol, deionized water, and propylene glycol methyl ether.

[0066] In the specific technical solution of this invention, the functional additives include leveling agents, wetting and dispersing agents, defoamers, and light stabilizers; the leveling agent is an organic modified siloxane; the wetting and dispersing agent is an alkynyl alcohol; the defoamer uses polyether-modified polydimethylsiloxane; and the light stabilizer is selected from benzotriazoles and triazines.

[0067] In the specific technical solution of this invention, the preparation process of the anti-glare coating composition includes: (1) Activate hollow silica particles to obtain surface-activated hollow silica particles; (2) The resin, particles, additives and solvent in the anti-glare coating composition are thoroughly stirred and mixed evenly to obtain the anti-glare coating composition.

[0068] <Polarizing Film Section> like Figure 5 As shown in the figure, a specific embodiment of the present invention provides an anti-glare polarizer, the polarizer comprising: a first optical film; a second optical film; and a PVA core layer 30 (Polyvinyl Alcohol, abbreviated as PVA), which is disposed between the first optical film and the second optical film, and at least one of the first optical film and the second optical film is the anti-glare optical film described above, and the PVA core layer 30 is attached to the surface of the anti-glare optical film away from the anti-glare coating.

[0069] The anti-glare polarizer of the present invention is a multilayer composite polymer optical film. The PVA core layer 30 serves as the core functional layer and is the first optical film. The second optical film serves as a protective layer, providing support and preventing the stretched PVA film from shrinking. The first and second optical films have high transparency, acid and alkali resistance, ultraviolet resistance, and good water-blocking properties, which can effectively protect the fragile PVA film from water vapor, ultraviolet rays, and external substances, ensuring the environmental weather resistance of the polarizer.

[0070] In the specific technical solution of this invention, such as Figure 6 As shown, the anti-glare polarizer further includes an adhesive layer 40, which is coated on the side of the first or second optical film away from the PVA core layer. The wet film thickness of the adhesive layer can be 1-20 μm, used to firmly and smoothly attach the polarizer to the glass substrate of the LCD or OLED panel. It requires high transparency, excellent resistance to moisture and heat, and appropriate adhesion, which determines the polarizer's surface mount processing performance. A typical adhesive layer 40 can be a pressure-sensitive adhesive (PSA).

[0071] In the specific technical solution of this invention, such as Figure 6As shown, the anti-glare polarizer further includes a release layer 50, which is disposed on the side of the adhesive layer away from the PVA core layer. It covers the surface of the adhesive layer and is responsible for protecting the pressure-sensitive adhesive layer from damage and preventing bonding bubbles before the polarizer is bonded to the LCD or OLED display panel. It must be peeled off before use.

[0072] In the specific technical solution of this invention, such as Figure 6 As shown, the anti-glare polarizer also includes a protective film 60, which is laminated on the outer side of the polarizer (typically 10-100μm thick, such as 50μm). It has high strength and anti-static properties, protecting the internal anti-glare polarizer from scratches or damage during processing and transportation.

[0073] The manufacturing process of the anti-glare polarizer of the present invention includes bonding a dyed and stretched PVA film with a first optical film or a second optical film together with an adhesive to form a polarizer main structure of "first optical film + PVA core layer + second optical film".

[0074] <Specific Implementation Examples> Example 1 The anti-glare coating composition, by weight, is formulated as follows: Components Specific raw materials Number of weights Multifunctional polyurethane acrylate Functionality ≥6, CN-102 polyurethane acrylate 30 acrylate monomers Trimethylolpropane triacrylate 20 Anti-glare particles PMMA particles, 4μm in diameter 8 Surface-activated hollow silica particles Particle size 200nm, after plasma activation treatment 12 Photoinitiator 1173+184 in a 1:1 ratio 5 solvent system Cyclohexane / n-hexane = 3:2 65 Functional additives Organosilicon leveling agent + alkynol wetting and dispersing agent 2 Hollow silica particles were plasma-activated for 30 minutes, resulting in a surface energy of 55 mN / m and an average particle size of 200 nm. The above components were mixed under light-protected conditions, stirred for 2 hours, and filtered to obtain an anti-glare coating composition.

[0075] A PMMA substrate with a thickness of 50 μm was used, and the prepared anti-glare coating composition was continuously coated onto the surface of the PMMA substrate using a slot coater. The wet film thickness was controlled so that the dry film thickness was 6.0 μm.

[0076] The speed and curing temperature of the slot coater are controlled at 60℃. The coated wet film intermediate is placed in an electrostatic field chamber with a voltage of 5kV / cm for 3 minutes to cure the particles, causing them to migrate or settle and arrange.

[0077] The cured sample was cured in a UV curing machine under nitrogen protection using a high-pressure mercury lamp (120mW / cm²), with the cumulative light intensity controlled at 300mJ / cm², to obtain an anti-glare optical film.

[0078] Example 2 The anti-glare coating composition, by weight, is formulated as follows: Components Specific raw materials Number of weights Multifunctional polyurethane acrylate Functionality ≥ 8, U-6P polyurethane acrylate 40 acrylate monomers Dipentaerythritol hexaacrylate (DPHA) 15 Anti-glare particles Silica particles, 6μm in diameter 15 Surface-activated hollow silica particles 100nm particle size 15 Photoinitiator TPO, long-wavelength initiator 6 solvent system Propylene glycol methyl ether / petroleum ether = 1:1 50 Functional additives Polyether-modified siloxane defoamer + benzotriazole light stabilizer 3 Hollow silica particles, after being activated by plasma for 30 minutes, have a surface energy of 70 mN / m and an average particle size of 100 nm.

[0079] The above components were mixed under light-protected conditions, stirred for 2 hours, and filtered to obtain the anti-glare coating composition. The preparation of the anti-glare optical film was the same as in Example 1.

[0080] Example 3 The anti-glare coating composition, by weight, is formulated as follows: Components Specific raw materials Number of weights Multifunctional polyurethane acrylate Functionality ≥6, CN-102 polyurethane acrylate 20 acrylate monomers Isoborneol acrylate 25 Anti-glare particles PS particles, 3μm in diameter 5 Surface-activated hollow silica particles Average particle size 80nm 10 Photoinitiator 907 4 solvent system Ethylene glycol / n-heptane = 2:3 70 Functional additives Alkyne alcohol wetting and dispersing agent + triazine light stabilizer 2 Hollow silica particles, after being plasma activated for 30 minutes, have a surface energy of 68 mN / m and an average particle size of 80 nm.

[0081] The above components were mixed under light-protected conditions, stirred for 2 hours, and filtered to obtain the anti-glare coating composition. The preparation of the anti-glare optical film was the same as in Example 1.

[0082] Example 4 The anti-glare coating composition, by weight, is formulated as follows: Components Specific raw materials Number of weights Multifunctional polyurethane acrylate Functionality ≥6, CN-102 polyurethane acrylate 25 acrylate monomers Bisphenol A epoxy acrylate 18 Anti-glare particles Melamine particles, 5μm in diameter 10 Surface-activated hollow silica particles Average particle size 150nm 13 Photoinitiator 819 3 solvent system n-Hexane 60 Functional additives Organosilicon leveling agent + polydimethylsiloxane defoamer 3 Hollow silica particles, after being plasma activated for 30 minutes, have a surface energy of 60 mN / m and an average particle size of 150 nm.

[0083] The above components were mixed under light-protected conditions, stirred for 2 hours, and filtered to obtain the anti-glare coating composition. The preparation of the anti-glare optical film was the same as in Example 1.

[0084] Example 5 The anti-glare coating composition, by weight, is formulated as follows: Components Specific raw materials Number of weights Multifunctional polyurethane acrylate Functionality ≥ 8, U-6P polyurethane acrylate 15 acrylate monomers Butyl acrylate 28 Anti-glare particles Composite PMMA + silica particles 12 Surface-activated hollow silica particles Average particle size 150nm 12 Photoinitiator 369 8 solvent system Deionized water / propylene glycol methyl ether = 1:1 75 Functional additives Organosilicon leveling agent + polydimethylsiloxane defoamer 2 Hollow silica particles, after being plasma activated for 30 minutes, have a surface energy of 60 mN / m and an average particle size of 150 nm.

[0085] The above components were mixed under light-protected conditions, stirred for 2 hours, and filtered to obtain the anti-glare coating composition. The preparation of the anti-glare optical film was the same as in Example 1.

[0086] Example 6 The anti-glare coating composition, by weight, is formulated as follows: Components Specific raw materials Number of weights Multifunctional polyurethane acrylate Functionality ≥ 8, U-6P polyurethane acrylate 10 acrylate monomers Dipropylene glycol diacrylate 10 Anti-glare particles PS particles, 2μm in diameter 3 Surface-activated hollow silica particles Particle size 50nm 10 Photoinitiator 184 3 solvent system Cyclohexane 80 Functional additives Organosilicon leveling agent + polydimethylsiloxane defoamer 1 Hollow silica particles, after being plasma activated for 30 minutes, have a surface energy of 70 mN / m and an average particle size of 50 nm.

[0087] The above components were mixed under light-protected conditions, stirred for 2 hours, and filtered to obtain the anti-glare coating composition. The preparation of the anti-glare optical film was the same as in Example 1.

[0088] Example 7 The anti-glare coating composition, by weight, is formulated as follows: Components Specific raw materials Number of weights Multifunctional polyurethane acrylate Functionality ≥ 8, U-6P polyurethane acrylate 35 acrylate monomers Cyclohexyl acrylate 20 Anti-glare particles Low-refractive-index PMMA particles 8 Surface-activated hollow silica particles 300nm particle size 10 Photoinitiator 1173 5 solvent system n-Heptane 62 Functional additives Organosilicon leveling agent + polydimethylsiloxane defoamer 2 Hollow silica particles, after being plasma activated for 30 minutes, have a surface energy of 40 mN / m and an average particle size of 300 nm.

[0089] The above components were mixed under light-protected conditions, stirred for 2 hours, and filtered to obtain the anti-glare coating composition. The preparation of the anti-glare optical film was the same as in Example 1.

[0090] Using the anti-glare coating compositions prepared in Examples 2-7 under the same conditions, anti-glare optical films 2-7 were obtained respectively. Commercially available anti-glare films were used as controls. Tests were conducted under the same conditions, and the specific performance parameter test conditions are as follows: (1) Haze test method: According to the standard ASTM D1003, the haze value of the anti-glare optical film is measured using a haze meter, and the measured value is taken as the haze value of the anti-glare optical film.

[0091] (2) Reflectance test method: Use a spectrophotometer to emit light of a specific wavelength (such as covering the visible light band of 380-780nm) to the sample and accurately measure the intensity of the reflected light.

[0092] (3) Adhesion test method: According to the standard ASTMD 3359, first draw a grid on the film surface with a grid cutter, then stick 3M 600 tape on the grid, and then quickly tear off the tape at a 180° angle to observe the grid peeling situation.

[0093] Judgment criteria: 5B: No coating peeling at all; 4B: Coating peeling area <5%; 3B: Coating peeling area 5%~15%; 2B: Coating peeling area 15%~35%; 1B: Coating peeling area 35%~65%; 0B: Coating peeling area >65%.

[0094] (4) Surface hardness test method: According to the standard ASTM D3363, a standard pencil of known hardness is used to plow the coating surface with the sharp edge of the pencil under the specified load and angle. The relative hardness of the coating is evaluated by observing whether the coating is damaged (scratched or indented).

[0095] (5) Anti-glare effect test method: The prepared anti-glare optical film was attached to a black acrylic plate with the wear-resistant layer facing up. After repeated inspections on three wavelength lamps, the clearer the outline of the lamp on the film, the worse the anti-glare performance; conversely, the clearer the outline, the better the anti-glare performance.

[0096] Judgment criteria: The lamp tube outline is uniformly diffused, with excellent anti-glare performance, marked as "◎"; the lamp tube outline is faintly visible, with average anti-glare performance, marked as "△"; the lamp tube outline is clearly visible, with poor anti-glare performance, marked as "×".

[0097] (6) Warpage test method: in accordance with standard GB / T 25257-2010.

[0098] Place the adjusted sample flat on the test platform or horizontal glass substrate and observe the bending direction of the film (such as transverse, longitudinal or diagonal warping). Place the sample with the warped side facing up and use a steel ruler with an accuracy of 0.5 mm to measure the height of warping on all four sides of the sample (unit: mm). Measure all samples in sequence and take the maximum value as the warping value of the sample.

[0099] (7) Surface roughness, which shall be determined in accordance with the standard JIS B 0601-1994.

[0100] The anti-glare optical films 1-7 and commercially available optical films were subjected to performance tests. The performance test results are shown in the table below: Test Project Haze (%) Anti-glare effect Reflectance (%) Adhesion (100-grid cross-section) Surface hardness Warpage (μm) Surface roughness (μm) Anti-glare optical film 1 5.0 ◎ 1.1 5B 5H 1.8 0.18 Anti-glare optical film 2 4.8 ◎ 1.3 5B 5H 1.9 0.15 Anti-glare optical film 3 4.2 ◎ 1.5 5B 5H 2.1 0.20 Anti-glare optical film 4 4.6 ◎ 1.8 5B 5H 1.7 0.05 Anti-glare optical film 5 3.7 ◎ 2.1 5B 4H 1.5 0.13 Anti-glare optical film 6 3.6 ◎ 1.6 5B 5H 3.2 0.12 Anti-glare optical film 7 5.1 ◎ 4.1 4B 3H 3.3 0.52 Commercially available anti-glare film 14.8 ◎ 4.1 3B 3H 4.2 0.64 As shown in the table above, the anti-glare optical film prepared in the embodiments of the present invention is significantly superior to the comparative examples and commercially available products in terms of anti-glare effect, reflectivity, hardness, adhesion, and warpage. This may indicate that the surface-activated hollow silica particles in the anti-glare coating composition of the present invention play a key role in achieving the synergistic effect of low reflectivity, high hardness, and high adhesion.

[0101] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. An anti-glare coating composition suitable for PMMA substrates, characterized in that, The coating composition comprises, by weight parts: Multifunctional polyurethane acrylate, 10-50 parts by weight; 10-30 parts by weight of acrylate monomer; Anti-glare particles: 3-20 parts by weight; 10-20 parts by weight of surface-activated hollow silica particles; Photoinitiator 2-10 parts by weight; Solvent system: 40-80 parts by weight; Functional additives, 1-3 parts by weight.

2. The anti-glare coating composition according to claim 1, characterized in that, The anti-glare coating composition contains a multifunctional polyurethane acrylate with a functionality greater than 5, and the coating composition comprises, by weight parts: 10-40 parts by weight of multifunctional polyurethane acrylate; 10-30 parts by weight of acrylate monomer; Anti-glare particles: 3-10 parts by weight; 10-15 parts by weight of surface-activated hollow silica particles; Photoinitiator 2-10 parts by weight; Solvent system: 40-80 parts by weight; Functional additives, 1-3 parts by weight; Preferably, the coating composition comprises, by weight parts: 10-30 parts by weight of multifunctional polyurethane acrylate; 10-20 parts by weight of acrylate monomer; Anti-glare particles: 3-15 parts by weight; 10-15 parts by weight of surface-activated hollow silica particles; Photoinitiator 2-8 parts by weight; Solvent system: 40-80 parts by weight; Functional additives, 1-3 parts by weight; Preferably, the coating composition comprises, by weight parts: Multifunctional polyurethane acrylate, 10-30 parts by weight; 20-30 parts by weight of acrylate monomer; Anti-glare particles: 3-10 parts by weight; 10-15 parts by weight of surface-activated hollow silica particles; Photoinitiator 2-8 parts by weight; Solvent system 50-80 parts by weight; Functional additives, 1-3 parts by weight.

3. The anti-glare coating composition according to claim 1, characterized in that, The anti-glare particles are at least one of silica inorganic particles, PMMA particles, PS particles, and melamine particles; Preferably, the average particle size of the anti-glare particles is 2-8 μm; Preferably, the average particle size of the hollow silica particles is 50nm-500nm; Preferably, the hollow silica particles are activated by plasma for 30 minutes before being added to the anti-glare coating composition; the surface energy of the hollow silica particles is 40 mN / m - 70 mN / m.

4. The anti-glare coating composition according to claim 1, characterized in that, The photoinitiator is one or a combination of 2-hydroxy-2-methyl-1-phenyl ketone (1173), 1-hydroxycyclohexyl-phenyl ketone (184), 2-methyl-1-{(4-methylthio)phenyl}-2-morpholino-1-propanone (907), 2,4,6-trimethylbenzoylbenzene-diphenylphosphine oxide (TPO), bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide (819), and 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-1-butanone (369).

5. The anti-glare coating composition according to claim 1, characterized in that, The solvent system is one or more combinations of n-hexane, n-heptane and cyclohexane, petroleum ether, ethylene glycol, deionized water and propylene glycol methyl ether.

6. The stain-resistant and anti-glare coating according to claim 1 or 2, characterized in that, The functional additives include leveling agents, wetting and dispersing agents, defoamers, and light stabilizers; the leveling agent is an organic modified siloxane; the wetting and dispersing agent is an alkynyl alcohol; the defoamer uses polyether-modified polydimethylsiloxane; and the light stabilizer is selected from benzotriazoles and triazines.

7. An anti-glare optical film comprising a PMMA substrate layer and an anti-glare coating attached to one side surface of the PMMA substrate layer, wherein the anti-glare coating is formed by coating the PMMA substrate with an anti-glare coating composition, wherein the anti-glare coating composition is the anti-glare coating composition according to any one of claims 1-6, the thickness of the substrate is 20-150 μm, and the thickness of the anti-glare coating is 2.0-10.0 μm.

8. The optical film according to claim 7, characterized in that, The thickness of the PMMA substrate layer is preferably 35-95 μm, or 40 μm, 60 μm, 80 μm, or 90 μm; The thickness of the anti-glare coating is preferably 2-6 μm, or 2.0 μm, 3.0 μm, 4.0 μm, 5.0 μm, or 6.0 μm; Preferably, the reflectivity of the anti-glare optical film is less than 2.0%; preferably, the reflectivity is less than 1.5% or less than 1.2%. Preferably, the warpage of the anti-glare optical film is less than 3.5 μm; preferably, the warpage of the anti-glare optical film is less than 3.0 μm, or less than 2.0 μm or 2.5 μm. Preferably, the surface hardness of the anti-glare optical film on one side of the anti-glare coating is not less than 3H; preferably, the surface hardness of the anti-glare optical film on one side of the anti-glare coating is not less than 4H or 5H. Preferably, the cross-cut adhesion test result of the anti-glare optical film on one side surface of the anti-glare coating is not less than 4B.

9. A method for preparing an anti-glare optical film, characterized in that, The method includes the following steps: (S1) Apply the anti-glare coating composition according to any one of claims 1-6 to the PMMA substrate using a slot coating, roller coating, spray coating or scraping method to form a PMMA substrate wet film adhesion intermediate; (S2) The PMMA substrate wet film attachment intermediate is moved into a cavity with an electric field for particle migration and curing treatment. (S3) The cured PMMA substrate wet film attachment intermediate is subjected to ultraviolet curing to obtain the anti-glare optical film.

10. An anti-glare polarizing film, characterized in that, The anti-glare polarizer includes: First optical film; Second optical film; A PVA core layer is disposed between the first optical film and the second optical film, and at least one of the first optical film and the second optical film is an anti-glare optical film as described in any one of claims 7 to 8, wherein the PVA core layer is attached to the surface of the anti-glare optical film away from the anti-glare coating.

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