Anti-dazzle film as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of optical thin films, and relates to an anti-dazzle film and a preparation method and application thereof. The anti-dazzle film comprises a polyester base material and an anti-dazzle layer arranged on the surface of one side of the polyester base material, the thickness of the polyester base material is smaller than or equal to 45 micrometers, the in-plane retardation value R0 is smaller than or equal to 75 nm, the retardation value Rth in the thickness direction is larger than or equal to 5000 nm, the surface of the anti-dazzle layer is provided with a concave-convex structure, and in the surface roughness test of the anti-dazzle layer with the concave-convex structure, the thickness of the anti-dazzle layer is larger than or equal to 50 micrometers. The arithmetic mean curvature Spc of the peak point is 50-150 mm <-1 >, and the average length Rsm of the profile curve element is 15-60 [mu] m, and by making the limitation on the structures of the polyester base material and the anti-dazzle layer, the obtained anti-dazzle film can have good anti-dazzle performance and has no rainbow lines on the premise that the polyester base material is thickened to improve the delay parameter to inhibit the rainbow lines, and the anti-dazzle film has good anti-dazzle performance and good anti-dazzle performance. And the device is light and thin.

Description

Technical Field

[0001] This invention belongs to the field of optical thin film technology, and relates to an anti-glare film, its preparation method and application. Background Technology

[0002] Polyester film, with its excellent optical transparency, mechanical strength, heat resistance, and electrical stability, has become an important choice for base films in the optoelectronic field. Polyester films used in optoelectronics often have a functional layer coated on the surface as a base film to achieve properties such as anti-glare, anti-reflection, and abrasion resistance.

[0003] Currently, when anti-glare layers are coated onto the surface of polyester films as anti-glare films, the resulting anti-glare films are prone to exhibiting reflected light interference, i.e., rainbow patterns, due to factors such as differences in the stretching process of the polyester film, differences in film and coating thickness, deviations in coating composition, and mismatches in refractive index. This affects the transparency and visual effect of the product. Existing technology CN103376479A discloses an anti-glare film, a polarizer, and an image display device. It suppresses rainbow patterns in the displayed image by selecting a polyester substrate with a specific retardation value (≥3000 nm) and combining this with the distribution of particles in the anti-glare layer. However, this invention relies on the high thickness of the substrate (approximately 100 μm), which cannot meet the requirements for thinner and lighter modern display devices.

[0004] Therefore, in order to address the above problems, there is an urgent need to develop a thin and lightweight anti-glare film that can suppress rainbow patterns and has good anti-glare properties. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide an anti-glare film, its preparation method, and its application. The anti-glare film can have good anti-glare properties and no rainbow pattern without relying on thickening the polyester substrate to increase the delay parameter to suppress rainbow patterns, and it also has the advantage of being lightweight and thin.

[0006] To achieve this objective, the present invention adopts the following technical solution: In a first aspect, the present invention provides an anti-glare film, the anti-glare film comprising a polyester substrate and an anti-glare layer disposed on one side surface of the polyester substrate; The polyester substrate has a thickness ≤ 45 μm (e.g., 44 μm, 43 μm, 42 μm, 41 μm, 40 μm, 39 μm, 38 μm, 37 μm, 36 μm or 35 μm, etc.), an in-plane retardation value R0 ≤ 75 nm (e.g., 74 nm, 73 nm, 72 nm, 71 nm, 70 nm, 69 nm, 68 nm, 67 nm, 66 nm, 65 nm, 60 nm or 55 nm, etc.), and a thickness direction retardation value Rth ≥ 5000 nm (e.g., 5000 nm, 5200 nm, 5400 nm, 5600 nm, 5800 nm, 6000 nm, 6500 nm, 7000 nm, 7500 nm, 8000 nm, 8500 nm, 9000 nm, 9500 nm or 10000 nm, etc.). The anti-glare layer has an uneven surface. In a surface roughness test of the anti-glare layer with this uneven surface, the arithmetic mean curvature Spc at the peak vertices is 50~150 mm. -1 (e.g., 50 mm) -1 60 mm -1 70 mm -1 80 mm -1 90mm -1 100 mm -1 110 mm -1 120 mm -1 130 mm -1 140 mm -1 Or 150 mm -1 (etc.), and the average length Rsm of the contour curve elements is 15~60 μm (e.g. 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, 55μm or 60μm, etc.).

[0007] On the one hand, this invention limits the thickness of the polyester substrate to ≤45 μm, ensuring that the resulting anti-glare film is thin and lightweight, meeting the thin and lightweight requirements of modern display devices. Simultaneously, it limits the in-plane retardation value R0 of the polyester substrate to ≤75 nm and the thickness retardation value Rth to ≥5000 nm. Under these conditions, the polyester substrate will only exhibit slight rainbow patterns in the rainbow pattern test, rather than severe rainbow patterns. This is because when natural light passes through the polyester substrate located at the extinction position between the crossed polarizers, the light intensity I... sin 2 ( R / ), where R is the delay value, For the wavelength of light, when When within the visible light wavelength range (380~780 nm), the light intensity I fluctuates with the retardation value of the polyester substrate, and the sin at different retardation values... 2 ( R / (The curve is as follows) Figure 1 As shown, from Figure 1 It can be seen that when the in-plane retardation value R0 of the polyester substrate is ≤75 nm, sin 2 ( R / The curve is in =The fluctuation is small in the range of 380~780 nm, and the transmitted light in the red, green, and blue bands is almost uniform. Therefore, only a slight rainbow pattern will appear. When the in-plane retardation value R0 of the polyester substrate is greater than 75 nm, sin 2 ( R / The curve is in =The transmittance fluctuates greatly within the range of 380~780 nm, with some wavelengths having higher transmittance and others lower transmittance. For white light sources, this will produce severe rainbow patterns when the transmittance is high. When the thickness retardation value Rth of the polyester substrate is ≥5000 nm, sin 2 ( R / The curve is in =In the range of 380~780nm, it exhibits dense periodic oscillations. Although some wavelengths of light cannot pass through, the transmitted light in the red, green, and blue bands is almost uniform. Therefore, the transmitted light is still white overall, with only slight rainbow patterns. On the other hand, the present invention specifies that the surface of the anti-glare layer has an uneven structure, and in the surface roughness test of the anti-glare layer with the uneven structure, the arithmetic mean curvature Spc of the peak is 50~150 mm. -1 Furthermore, the average length Rsm of the contour curve elements is 15~60 μm; where, the arithmetic mean curvature Spc of the peak vertices represents the average principal curvature of the surface peak vertices, which can characterize the sharpness of the convex parts in the concave-convex structure (the larger the value, the steeper the convex part, and vice versa), and the Spc is limited to 50~150 mm. -1 The range corresponds to a "medium steepness" convex section, which allows reflected light to be "diffusely reflected at multiple angles," ensuring the light scattering required for anti-glare, while avoiding stray light reflection caused by excessive steepness, thus affecting contrast. If the value of Spc is too large (>150 mm), -1 If the convex portion is too steep, its side angle is large, approaching a straight line rather than an arc, thus generating strong directional reflected light. This can easily cause local interference with the reflected light at the polyester substrate interface, leaving behind rainbow-like patterns. If the value of Spc is too small (<50 mm), -1If the convex portion is too flat, the surface of the anti-glare layer 2 will be nearly flat, the diffuse reflection ability will be weakened, and the anti-glare performance will be reduced. The average length Rsm of the contour curve element represents the arithmetic mean of the lengths of the contour curve elements over a reference length ("contour curve" is a general term for curves such as cross-sectional curves, roughness curves, and waviness curves; "reference length" is the roughness parameter such as the arithmetic mean roughness obtained by extracting a certain length from the contour curve). The average length Rsm can be directly related to the "roughness scale" of the micro-texture of the anti-glare layer surface. Limiting the average length Rsm of the contour curve element to between 15 and 60 μm means that the anti-glare layer surface forms a medium-scale continuous unevenness, which can achieve anti-glare through scattering, and the scattering can further "homogenize" the light transmitted through the anti-glare layer. Even if there are slight wavelength differences remaining in the substrate, they will be dispersed in different directions by the uneven structure, suppressing the generation of rainbow patterns. If Rsm is too large (>60 μm), the unevenness spacing is close to the resolution limit of the human eye, which is prone to "local light spot aggregation", resulting in residual slight rainbow patterns. If Rsm is too small (<15 μm), the unevenness spacing is close to the visible light wavelength (380~780 nm). (nm), which is prone to new interference due to the resonance effect between structure and wavelength, thus destroying the rainbow ripple suppression effect; In summary, the anti-glare film provided by this invention does not rely on thickening the polyester substrate to increase the retardation parameter to suppress rainbow patterns. Instead, it controls the thickness of the polyester substrate to ≤45 μm, the in-plane retardation value R0 ≤75 nm, and the thickness direction retardation value Rth ≥5000 nm. This results in minimal intensity fluctuations of polarized light transmitted through the polyester substrate in the visible light band, thus initially reducing rainbow patterns. Furthermore, in surface roughness tests on the anti-glare layer with its uneven structure, the arithmetic mean curvature Spc at the peak is limited to 50~150 mm. -1 Furthermore, the average length Rsm of the contour curve elements is 15~60 μm, which discretizes the optical path difference of reflected / transmitted light, disrupts stable interference, and uniformly disperses wavelength differences, further eliminating rainbow patterns and optimizing the reflection state. The smooth convex part avoids strong directional reflection, further reducing the intensity of coherent light while ensuring anti-glare performance. Ultimately, the resulting anti-glare film has good anti-glare properties, no rainbow patterns, and the advantage of being lightweight and thin.

[0008] In this invention, the thickness of the polyester substrate can be measured using a digital micrometer (manufactured by Anritsu Corporation, product name "KC-351C").

[0009] In this invention, the in-plane retardation value R0 of the polyester substrate is calculated according to the following formula: R0=△N xy ×d0; Where d0 is the thickness of the polyester substrate in the opposite direction of light propagation; △N xy For in-plane refractive index anisotropy, according to ΔN xy =|N x -N y |Calculated, N y N represents the refractive index of the polyester substrate in the slow-axis direction (determined by a MOA-6004 molecular orientation meter). x The refractive index of the polyester substrate in the direction orthogonal to the slow axis was obtained by measuring with an Abbe refractometer (NAR-4T, 589 nm wavelength).

[0010] In this invention, the thickness retardation value Rth of the polyester substrate is calculated according to the following formula: Rth=[(△N xz ×d)+(△N yz ×d)] / 2; Where d is the physical thickness of the polyester substrate in the thickness direction (usually the z-direction); △N xz and △N yz Both are birefringences in the thickness direction of polyester substrates, where ΔN xz =|N x -N z |,△N yz =|N y -N z |,N y N represents the refractive index of the polyester substrate in the slow-axis direction (determined by a MOA-6004 molecular orientation meter). x N represents the refractive index of the polyester substrate in the direction orthogonal to the slow axis. z The refractive index in the thickness direction was obtained by measuring the Abbe refractometer (NAR-4T, 589 nm wavelength).

[0011] In this invention, the surface roughness test of the anti-glare layer with its uneven structure refers to the surface roughness test based on the ISO25178 standard. If necessary, a white light interferometric laser microscope system (Keyence, VK-X3000) can be used for measurement. The specific test steps are as follows: The sample surface was cleaned and dried, and then scanned using the objective lens of a scanning white interference microscope (magnification 20x). The scanning area was typically 703.12 × 937.42 μm. During the scanning process, the system automatically generated digital data of the surface morphology, including the arithmetic mean curvature of the peaks (Spc) of 50–150 mm. -1 The average length Rsm of the contour curve elements is 15~60 μm.

[0012] Preferably, the polyester substrate comprises polyethylene terephthalate (PET) substrate.

[0013] In this invention, the source of the PET substrate is not particularly limited, as long as its in-plane retardation value R0 and thickness direction retardation value Rth meet the defined range. Commercially available products can be purchased directly and prepared according to existing methods. However, in order to ensure that the performance of the obtained anti-glare film is superior, the following method is preferred for preparing the PET substrate: The method for preparing the PET substrate includes: extruding polyethylene terephthalate resin (SKC) through an extruder at 275~285℃ (e.g., 275℃, 277℃, 279℃, 281℃, 283℃, or 285℃, etc.) to obtain an extrudate; then die-casting it through a casting roll at 28~33℃ (e.g., 28℃, 29℃, 30℃, 31℃, 32℃, or 33℃, etc.) to obtain an unstretched sheet; and then preheating it at 75~80℃ (e.g., 75℃, 76℃, 77℃, 78℃, 79℃, or 80℃, etc.) for 20~30 min (e.g., 20 min, 22 min, 24 min, 26 min, 28 min, or 30 min, etc.). After (e.g., min), it is then stretched longitudinally (MD) by 3.0 to 3.5 times (e.g., 3 times, 3.1 times, 3.15 times, 3.2 times, 3.25 times, 3.3 times, 3.35 times, 3.4 times, 3.45 times, or 3.5 times) and transversely (TD) by 123~130℃ (e.g., 123℃, 124℃, 125℃, 126℃, 127℃, 128℃, 129℃, or 130℃). The PET substrate is obtained by thermosetting the material at 3.0 to 3.5 times the concentration (e.g., 3 times, 3.05 times, 3.1 times, 3.15 times, 3.2 times, 3.25 times, 3.3 times, 3.35 times, 3.4 times, 3.45 times, or 3.5 times, etc.) and then thermosetting it at 180 to 200°C (e.g., 180°C, 182°C, 184°C, 186°C, 188°C, 190°C, 192°C, 194°C, 196°C, 198°C, or 200°C, etc.) for 28 to 33 seconds (e.g., 28 s, 28.5 s, 29 s, 29.5 s, 30 s, 30.5 s, 31 s, 31.5 s, 32 s, 32.5 s, or 33 s, etc.).

[0014] In the above preparation method, the thickness, in-plane retardation value R0, and thickness retardation value Rth of the obtained PET substrate can be changed by adjusting the stretching ratio in the MD direction and / or the stretching ratio in the TD direction during the stretching step.

[0015] Preferably, the thickness of the anti-glare layer is 4~6 μm, such as 4 μm, 4.2 μm, 4.4 μm, 4.6 μm, 4.8 μm, 5 μm, 5.2 μm, 5.4 μm, 5.6 μm, 5.8 μm or 6 μm.

[0016] Preferably, the anti-glare layer is made of adhesive resin, modified needle-like inorganic particles, and organic particles.

[0017] Preferably, the anti-glare layer comprises the following components by weight: 75-95 parts by weight of adhesive resin; 3-5 parts by weight of modified needle-shaped inorganic particles; 8-12 parts by weight of organic particles.

[0018] In this invention, by synergistically combining the above-mentioned components within a specific dosage range, it is possible to achieve an arithmetic mean curvature (Spc) of 50~150 mm at the peak in a surface roughness test of the anti-glare layer with an uneven structure. -1 Furthermore, the average length Rsm of the contour curve elements is 15~60 μm, which results in the final anti-glare film having good anti-glare properties and no rainbow pattern.

[0019] The content of the adhesive resin can be 75 parts by weight, 77 parts by weight, 79 parts by weight, 81 parts by weight, 83 parts by weight, 85 parts by weight, 87 parts by weight, 89 parts by weight, 91 parts by weight, 93 parts by weight, or 95 parts by weight, etc.

[0020] The content of the modified needle-shaped inorganic particles can be 3 parts by weight, 3.2 parts by weight, 3.4 parts by weight, 3.6 parts by weight, 3.8 parts by weight, 4 parts by weight, 4.2 parts by weight, 4.4 parts by weight, 4.6 parts by weight, 4.8 parts by weight, or 5 parts by weight, etc.

[0021] The content of the organic particles can be 8 parts by weight, 8.5 parts by weight, 9 parts by weight, 9.5 parts by weight, 10 parts by weight, 10.5 parts by weight, 11 parts by weight, 11.5 parts by weight, or 12 parts by weight, etc.

[0022] Preferably, the modified needle-like inorganic particles are prepared by the following method, which includes the following steps: (A1) Unmodified needle-shaped inorganic particles are reacted with an aminosilane coupling agent to obtain amino-modified needle-shaped inorganic particles. (A2) The amino-modified needle-shaped inorganic particles obtained in step (A1) are reacted with glycidyl methacrylate to obtain the modified needle-shaped inorganic particles.

[0023] As a preferred embodiment of the present invention, modified needle-shaped inorganic particles, modified by the above-described method, are preferably added to the material of the anti-glare layer. These modified needle-shaped inorganic particles naturally possess a needle-like micro / nano structure, containing potential for light scattering. However, before modification, they have two problems: first, their surface is hydrophilic (containing a large number of hydroxyl groups), easily agglomerating into "lumps," which masks the anisotropy of the needle-like structure and results in uneven light diffusion; second, without a modified layer, the refractive index difference between the surface and the resin matrix is ​​large, easily causing localized strong reflections and color shift. In the modification method provided by the present invention, an aminosilane coupling agent is first used to pretreat the needle-shaped inorganic particles, initially improving their dispersibility in the resin matrix. The subsequent grafting of glycidyl methacrylate (containing double bonds, which can polymerize with the resin matrix) weakens the refractive index difference with the resin matrix, avoiding color shift and rainbow patterns. Simultaneously, it improves compatibility with the resin matrix and ensures uniform dispersion within the anti-glare layer. This guarantees stable average length Rsm of the contour curve elements during surface roughness testing of the anti-glare layer with its uneven structure, preventing insufficient local diffusion due to structural inhomogeneity. Furthermore, the modified needle-like inorganic particles can synergistically distribute with organic particles, forming moderately sized protrusions. This allows for better control of the arithmetic mean curvature Spc of the protrusion peaks to reach a defined range, breaking the regularity of a single structure and enhancing the anti-glare effect.

[0024] Preferably, before step (A1), a pretreatment step of the unmodified needle-shaped inorganic particles is included. The pretreatment method includes: vacuum drying the unmodified needle-shaped inorganic particles at 100~120℃ (e.g., 100℃, 102℃, 104℃, 106℃, 108℃, 110℃, 112℃, 114℃, 116℃, 118℃ or 120℃, etc.) for 2~4 h (e.g., 2 h, 2.2 h, 2.4 h, 2.6 h, 2.8 h, 3 h, 3.2 h, 3.4 h, 3.6 h, 3.8 h or 4 h, etc.) to complete the pretreatment. The pretreatment step can effectively remove free water and some bound water from the needle-shaped inorganic particles, thereby improving their dispersibility in the coating solution.

[0025] Preferably, the pretreatment further includes a step of dispersing the dried unmodified needle-shaped inorganic particles for 10-30 minutes using a high-speed mixer (1000-2000 rpm) or a planetary ball mill (equipped with inert grinding media, such as alumina balls).

[0026] Preferably, the unmodified needle-shaped inorganic particles in step (A1) comprise wollastonite.

[0027] Preferably, the aminosilane coupling agent in step (A1) includes any one or a combination of at least two of γ-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, or 3-aminopropylmethyldiethoxysilane.

[0028] Preferably, the mass ratio of the unmodified needle-shaped inorganic particles to the aminosilane coupling agent in step (A1) is (5~20):1, for example, 5:1, 7:1, 9:1, 11:1, 13:1, 15:1, 17:1, 19:1 or 20:1.

[0029] Preferably, the reaction in step (A1) is carried out in a mixed solvent of ethanol and water.

[0030] Preferably, the volume ratio of ethanol to water is (9~12):1, for example, 9:1, 9.5:1, 10:1, 10.5:1, 11:1, 11.5:1 or 12:1, etc.

[0031] Preferably, the reaction temperature in step (A1) is 60~70℃ (e.g., 60℃, 61℃, 62℃, 63℃, 64℃, 65℃, 66℃, 67℃, 68℃, 69℃ or 70℃, etc.), and the time is 2~3 h (e.g., 2 h, 2.1 h, 2.2 h, 2.3 h, 2.4 h, 2.5 h, 2.6 h, 2.7 h, 2.8 h, 2.9 h or 3 h, etc.).

[0032] Preferably, the mass ratio of the amino-modified needle-shaped inorganic particles to glycidyl methacrylate in step (A2) is (5~20):1, for example, 5:1, 7:1, 9:1, 11:1, 13:1, 15:1, 17:1, 19:1 or 20:1.

[0033] Preferably, the reaction in step (A2) is carried out under nitrogen protection.

[0034] Preferably, the reaction in step (A2) is carried out at a temperature of 70-80°C (e.g., 70°C, 71°C, 72°C, 73°C, 74°C, 75°C, 76°C, 77°C, 78°C, 79°C, or 80°C) for 5-7 hours (e.g., 5 hours, 5.2 hours, 5.4 hours, 5.6 hours, 5.8 hours, 6 hours, 6.2 hours, 6.4 hours, 6.6 hours, 6.8 hours, or 7 hours).

[0035] As a preferred embodiment of the present invention, the method for preparing the modified needle-like inorganic particles includes the following steps: (1) Pretreatment: The unmodified needle-shaped inorganic particles were vacuum dried at 100~120℃ for 2~4 h, and the dried unmodified needle-shaped inorganic particles were dispersed for 10~30 min using a high-speed mixer or planetary ball mill. (2) Introduction of amino groups: Anhydrous ethanol and deionized water are mixed, and an aminosilane coupling agent is added. The mixture is magnetically stirred for 15-20 minutes (e.g., 15 min, 16 min, 17 min, 18 min, 19 min, or 20 min) at a speed of 300-350 rpm (e.g., 300 rpm, 305 rpm, 310 rpm, 315 rpm, 320 rpm, 325 rpm, 330 rpm, 335 rpm, 340 rpm, 345 rpm, or 350 rpm, etc.) to fully hydrolyze the aminosilane coupling agent to generate silanol groups -Si-OH. Then, pretreated unmodified needle-shaped inorganic particles are added. The mixture is then stirred in a constant temperature water bath at 60-70℃ at a speed of 800-1000 rpm (e.g., 800 rpm, 820 rpm, 840 rpm, 860 rpm, 880 rpm, 900 rpm, 920 rpm, etc.). The mixture was reacted under mechanical stirring at 940 rpm, 960 rpm, 980 rpm, or 1000 rpm for 2-3 h, then filtered, washed with anhydrous ethanol, and vacuum dried at 105-110℃ (e.g., 105℃, 106℃, 107℃, 108℃, 109℃, or 110℃) for 4-5 h (e.g., 4 h, 4.2 h, 4.4 h, 4.6 h, 4.8 h, or 5 h) to obtain amino-modified needle-like inorganic particles. (3) Introduction of glycidyl methacrylate: Amino-modified needle-like inorganic particles and glycidyl methacrylate are added to toluene and ultrasonically dispersed for 15-20 min (e.g., 300 W, 310 W, 320 W, 330 W, 340 W, 350 W, 360 W, 370 W, 380 W, 390 W or 400 W, etc.) at a power of 300-400 W to form a uniform suspension. After deoxygenation by purging with nitrogen (N2) for 10-15 min, the suspension is then maintained at 70-80℃ and 600-800 rpm (e.g., 600 rpm, 620 rpm, 640 rpm, 660 rpm, 680 rpm, 700 rpm, 720 rpm, 740 rpm, 760 rpm, 780 rpm or 800 rpm). After reacting under mechanical stirring (e.g., rpm) for 4-6 h, the product was separated by centrifugation, washed 3-4 times with acetone, and dried under vacuum at 80-85℃ for 5-7 h to obtain the modified needle-shaped inorganic particles.

[0036] Preferably, the organic particles comprise methyl methacrylate-styrene copolymer.

[0037] Preferably, the adhesive resin comprises urethane acrylate and polyfunctional acrylate.

[0038] Preferably, a base coating layer is further provided between the polyester substrate and the anti-glare layer. The presence of the base coating layer can further improve the adhesion between the polyester substrate and the anti-glare layer. The present invention does not particularly limit the material of the base coating layer, and can select base coating materials known in the art, such as thermosetting polyester resin, thermoplastic polyester resin, urethane resin, acrylic resin and their modified forms.

[0039] In addition, depending on actual needs, functional layers, such as low-refractive layers, anti-fouling layers, and antistatic layers, can be further superimposed on the anti-glare layer.

[0040] In a second aspect, the present invention provides a method for preparing an anti-glare film as described in the first aspect, the method comprising: coating an anti-glare layer coating liquid onto one side surface of a polyester substrate, and subjecting it to a curing treatment to obtain the anti-glare film.

[0041] Preferably, the coating liquid comprises the following components in parts by weight: 40-50 parts by weight of urethane acrylate; 35-45 parts by weight of multifunctional acrylate; 20-30 parts by weight of methyl isobutyl ketone; 3-5 parts by weight of modified needle-shaped inorganic particles; 8-12 parts by weight of organic particles; Photoinitiator 0.1~2 parts by weight.

[0042] The content of the urethane acrylate can be 40 parts by weight, 42 parts by weight, 44 parts by weight, 46 parts by weight, 48 parts by weight, 50 parts by weight, 52 parts by weight, 54 parts by weight, 56 parts by weight, 58 parts by weight, or 60 parts by weight, etc.

[0043] The content of the polyfunctional acrylate can be 35 parts by weight, 37 parts by weight, 39 parts by weight, 41 parts by weight, 43 parts by weight, or 45 parts by weight, etc.

[0044] The content of the methyl isobutyl ketone can be 20 parts by weight, 22 parts by weight, 24 parts by weight, 26 parts by weight, 28 parts by weight, or 30 parts by weight, etc.

[0045] The content of the modified needle-shaped inorganic particles can be 3 parts by weight, 3.2 parts by weight, 3.4 parts by weight, 3.6 parts by weight, 3.8 parts by weight, 4 parts by weight, 4.2 parts by weight, 4.4 parts by weight, 4.6 parts by weight, 4.8 parts by weight, or 5 parts by weight, etc.

[0046] The content of the organic particles can be 8 parts by weight, 8.5 parts by weight, 9 parts by weight, 9.5 parts by weight, 10 parts by weight, 10.5 parts by weight, 11 parts by weight, 11.5 parts by weight, or 12 parts by weight, etc.

[0047] The content of the photoinitiator can be 0.1 parts by weight, 0.2 parts by weight, 0.4 parts by weight, 0.6 parts by weight, 0.8 parts by weight, 1 part by weight, 1.2 parts by weight, 1.4 parts by weight, 1.6 parts by weight, 1.8 parts by weight, or 2 parts by weight, etc.

[0048] Preferably, the photoinitiator comprises any one or a combination of at least two of 1-hydroxycyclohexylphenyl ketone, benzyl dimethyl ketal, hydroxydimethyl acetophenone, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, or benzoin butyl ether.

[0049] Preferably, the coating liquid further includes 1 to 5 parts by weight (e.g., 1 part by weight, 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, 3 parts by weight, 3.5 parts by weight, 4 parts by weight, 4.5 parts by weight, or 5 parts by weight, etc.) of leveling agent.

[0050] Preferably, the preparation method of the coating liquid includes: mixing urethane acrylate with polyfunctional acrylate, adding methyl isobutyl ketone, stirring at 30-40°C (e.g., 30°C, 32°C, 34°C, 36°C, 38°C, or 40°C, etc.) for 10-15 min (e.g., 10 min, 11 min, 12 min, 13 min, 14 min, or 15 min, etc.), adding modified needle-shaped inorganic particles, continuing to stir for 10-15 min (e.g., 10 min, 11 min, 12 min, 13 min, 14 min, or 15 min, etc.), then adding organic particles, and stirring for 5-10 min (e.g., 5 min, 6 min, 7 min, 8 min, 9 min, or 10 min, etc.). After stirring for 20-30 minutes (e.g., 20 min, 21 min, 22 min, 23 min, 24 min, 25 min, 26 min, 27 min, 28 min, 29 min, or 30 min) at 40-60°C (e.g., 40°C, 42°C, 44°C, 46°C, 48°C, 50°C, 52°C, 54°C, 56°C, 58°C, or 60°C, etc.), the coating solution is obtained.

[0051] Preferably, the coating method is roller coating.

[0052] Preferably, the curing process is a UV curing process.

[0053] Thirdly, the present invention provides a polarizing plate, wherein the polarizing plate includes an anti-glare film as described in the first aspect.

[0054] Fourthly, the present invention provides a display device, the display device including the anti-glare film as described in the first aspect.

[0055] Compared with the prior art, the present invention has the following beneficial effects: The anti-glare film provided by this invention includes a polyester substrate and an anti-glare layer disposed on one side surface of the polyester substrate. The polyester substrate has a thickness ≤45 μm, an in-plane retardation value R0 ≤75 nm, and a thickness direction retardation value Rth ≥5000 nm. The surface of the anti-glare layer has an uneven structure. In the surface roughness test of the anti-glare layer with the uneven structure, the arithmetic mean curvature Spc of the peak is 50~150 mm. -1 Furthermore, the average length Rsm of the contour curve element is 15~60 μm. By making the above-mentioned limitations on the structure of the polyester substrate and the anti-glare layer, the resulting anti-glare film can have good anti-glare performance and no rainbow pattern without relying on thickening the polyester substrate to increase the delay parameter to suppress rainbow patterns. It also has the advantage of being lightweight and thin. Attached Figure Description

[0056] Figure 1 sin under different delay values 2 ( R / (Curve graph) Detailed Implementation

[0057] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0058] The "range" disclosed in this invention can be defined in the form of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of the specific range. This type of range definition can include or exclude endpoints; any endpoint can be independently included or excluded, and they can be arbitrarily combined, meaning any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60~120 and 80~110 are listed for specific parameters, it is understood that ranges of 60~110 and 80~120 are also expected. Furthermore, if minimum range values ​​1 and 2 are listed, and maximum range values ​​3, 4, and 5 are also listed, then the following ranges are all expected: 1~3, 1~4, 1~5, 2~3, 2~4, and 2~5. In this invention, unless otherwise stated, the numerical range "a~b" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0~5" indicates that all real numbers between "0" and "5" have been listed in this article; "0~5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is described as an integer ≥2, it is equivalent to listing integers such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc. For instance, when a parameter is described as an integer selected from "2~10", it is equivalent to listing the integers 2, 3, 4, 5, 6, 7, 8, 9, and 10.

[0059] In this invention, "a combination of at least two" refers to a quantity greater than or equal to two, unless otherwise specified. For example, "any combination of one or at least two" means one or more or more items. It can be understood that when referring to "a combination of at least two," it refers to any suitable combination of multiple items, that is, a combination of "at least two" items carried out in a manner that does not conflict with and enables the implementation of this invention.

[0060] The term "embodiment" as used in this invention means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment or implementation of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention can be combined with other embodiments.

[0061] In this invention, open-ended technical features or solutions described using terms such as "comprising" do not exclude additional members beyond those listed unless otherwise specified. They can be considered as providing both closed-ended features or solutions comprised of the listed members and open-ended features or solutions that include additional members beyond the listed members. For example, A includes a1, a2, and a3. Unless otherwise specified, it may also include other members or exclude additional members. This can be considered as providing both technical features or solutions where "A is composed of a1, a2, and a3" or "A is selected from a1, a2, and a3," and technical features or solutions where "A includes not only a1, a2, and a3, but also other members."

[0062] In this invention, unless otherwise specified, the features or solutions corresponding to "and / or" include any one of two or more of the related listed items, as well as any and all combinations of the related listed items. These arbitrary and all combinations include any two related listed items, any more related listed items, or a combination of all related listed items. For example, "A and / or B" represents a group consisting of A, B, and "a combination of A and B". "Containing A and / or B" can mean "containing A, containing B, and containing A and B", or "containing A, containing B, or containing A and B", and can be appropriately understood according to the context.

[0063] In this invention, the terms "first aspect," "second aspect," "third aspect," "fourth aspect," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or quantity, nor should they be construed as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first," "second," "third," "fourth," etc., serve only as a non-exhaustive enumeration and should be understood not to constitute a closed limitation on the quantity.

[0064] Example 1 An anti-glare film includes a polyester substrate and an anti-glare layer disposed on one side surface of the polyester substrate; The polyester substrate is made of PET resin (TN8065S polyester chips from Teijin Corporation, Japan), with a thickness of 45 μm, an in-plane retardation value R0 of 41.53 nm, and a thickness direction retardation value Rth of 5521 nm. The anti-glare layer has a thickness of 4 μm and a surface with an uneven structure. In the surface roughness test of the anti-glare layer with the uneven structure, the arithmetic mean curvature Spc of the peak is 149.25 mm. -1 The average length Rsm of the contour curve elements is 59.66 μm. The method for preparing the anti-glare film includes the following steps: (1) Preparation of polyester substrate: PET resin is extruded through an extruder at 275°C to obtain an extruded material. Then, it is die-cast through a casting roll at 28°C to obtain an unstretched sheet. After preheating at 75°C for 20 min, it is stretched 3.0 times in the longitudinal direction (MD) and 3.1 times in the transverse direction (TD) at 123°C. Finally, it is thermocured at 180°C for 28 s to obtain the PET substrate. (2) Preparation of modified wollastonite: S1 Pretreatment: Unmodified wollastonite was vacuum dried at 100℃ for 2 h, and the dried unmodified wollastonite was dispersed at 1000 rpm using a high-speed mixer for 10 min. S2 Introduction of amino groups: Anhydrous ethanol and deionized water were mixed at a volume ratio of 9:1, and aminosilane coupling agent KH550 was added. The mixture was magnetically stirred at 300 rpm for 15 min to allow the aminosilane coupling agent KH550 to be fully hydrolyzed to generate silanol groups -Si-OH. Then, pretreated unmodified wollastonite (the mass ratio of aminosilane coupling agent KH550 to unmodified wollastonite was 1:10) was added. The mixture was reacted in a constant temperature water bath at 60℃ with mechanical stirring at 800 rpm for 2 h. After filtration, washing with anhydrous ethanol, and vacuum drying at 105℃ for 4 h, amino-modified wollastonite was obtained. S3 Introduction of glycidyl methacrylate: Amino-modified wollastonite and glycidyl methacrylate were added to toluene (the mass ratio of amino-modified wollastonite to glycidyl methacrylate was 10:1). The mixture was ultrasonically dispersed at 300 W for 15 min to form a uniform suspension. After purging with nitrogen for 10 min to remove oxygen, the mixture was reacted at 70 °C and 600 rpm for 4 h with mechanical stirring. The product was then centrifuged, washed three times with acetone, and vacuum dried at 80 °C for 5 h to obtain the modified wollastonite.

[0065] (3) Preparation of coating solution: 40 parts by weight of urethane acrylate (purchased from Arakawa Chemical Industry Co., Ltd., brand name BEAMSET580) and 35 parts by weight of polyfunctional acrylate (purchased from Osaka Organic Chemical Co., Ltd., brand name Viscoat #300) were mixed, 20 parts by weight of methyl isobutyl ketone were added, and the mixture was stirred at 30°C for 10 min. Then, 3 parts by weight of the modified wollastonite obtained in step (2) were added, and the mixture was stirred for another 10 min. Then, 8 parts by weight of PMMA-PS copolymer (purchased from Sekisui Chemicals Co., Ltd., brand name SSX-103DXE) were added, and the mixture was stirred for 5 min. Then, 0.1 parts by weight of 1-hydroxycyclohexylphenyl ketone and 1 part by weight of leveling agent (purchased from DIC Co., Ltd., brand name GRANDIC PC 4100) were added, and the mixture was stirred at 40°C for 20 min to obtain the coating liquid. (4) Preparation of anti-glare film: The coating liquid obtained in step (3) is roller-coated onto the surface of the polyester substrate obtained in step (1), and subjected to a coating of 280 mJ / cm. 2 The anti-glare film is obtained by UV curing.

[0066] Example 2 An anti-glare film, having the same structure as in Example 1, includes a polyester substrate and an anti-glare layer disposed on one side surface of the polyester substrate; The polyester substrate is made of PET resin (TN8065S polyester chips from Teijin Corporation, Japan), with a thickness of 42 μm, an in-plane retardation value R0 of 55.69 nm, and a thickness direction retardation value Rth of 5847 nm. The anti-glare layer has a thickness of 5 μm and a surface with an uneven structure. In the surface roughness test of the anti-glare layer with the uneven structure, the arithmetic mean curvature of the peak, Spc, is 70.34 mm. -1 The average length Rsm of the contour curve elements is 31.22 μm; The method for preparing the anti-glare film includes the following steps: (1) Preparation of polyester substrate: PET resin is extruded through an extruder at 275°C to obtain an extruded material. Then, it is die-cast through a casting roll at 30°C to obtain an unstretched sheet. After preheating at 78°C for 25 min, it is stretched 3.3 times in the longitudinal direction (MD) and 3.3 times in the transverse direction (TD) at 123°C. Finally, it is thermocured at 190°C for 30 s to obtain the PET substrate.

[0067] (2) Preparation of modified wollastonite: S1 Pretreatment: Unmodified wollastonite was vacuum dried at 110℃ for 3 h, and then dispersed in a high-speed mixer at 1500 rpm for 20 min to obtain pretreated unmodified wollastonite. S2 Introduction of amino groups: Anhydrous ethanol and deionized water were mixed at a volume ratio of 10:1, aminosilane coupling agent KH550 was added, and the mixture was magnetically stirred at 320 rpm for 18 min. Then, pretreated unmodified wollastonite (the mass ratio of aminosilane coupling agent KH550 to unmodified wollastonite was 1:13) was added, and the mixture was reacted in a constant temperature water bath at 65℃ and mechanically stirred at 900 rpm for 2.5 h. After filtration, washing with anhydrous ethanol, and vacuum drying at 108℃ for 4.5 h, amino-modified wollastonite was obtained. S3 Introduction of glycidyl methacrylate: Amino-modified wollastonite and glycidyl methacrylate were added to toluene (the mass ratio of amino-modified wollastonite to glycidyl methacrylate was 13:1). The mixture was ultrasonically dispersed at 350 W for 18 min to form a uniform suspension. After purging with nitrogen for 13 min to remove oxygen, the mixture was reacted at 75 °C and 700 rpm for 5 h. The product was then centrifuged, washed four times with acetone, and vacuum dried at 82 °C for 6 h to obtain the modified wollastonite.

[0068] (3) Preparation of coating solution: 45 parts by weight of urethane acrylate (purchased from Arakawa Chemical Industry Co., Ltd., brand name BEAMSET580) and 40 parts by weight of polyfunctional acrylate (purchased from Osaka Organic Chemical Co., Ltd., brand name Viscoat #300) were mixed, 25 parts by weight of methyl isobutyl ketone were added, and the mixture was stirred at 35°C for 13 min. Then, 4 parts by weight of the modified wollastonite obtained in step (2) were added and the mixture was stirred for 12 min. Then, 10 parts by weight of PMMA-PS copolymer (purchased from Sekisui Chemicals Co., Ltd., brand name SSX-103DXE) were added and the mixture was stirred for 7 min. Then, 1 part by weight of benzyl dimethyl ketal and 3 parts by weight of leveling agent (purchased from DIC Co., Ltd., brand name GRANDIC PC 4100) were added and the mixture was stirred at 50°C for 25 min to obtain the coating liquid. (4) Preparation of anti-glare film: The coating liquid obtained in step (3) is roller-coated onto the surface of the polyester substrate obtained in step (1), and subjected to a coating of 280 mJ / cm. 2 The anti-glare film is obtained by UV curing.

[0069] Example 3 An anti-glare film, having the same structure as in Example 1, includes a polyester substrate and an anti-glare layer disposed on one side surface of the polyester substrate; The polyester substrate is made of PET resin (TN8065S polyester chips from Teijin Corporation, Japan), with a thickness of 38 μm, an in-plane retardation value R0 of 70.54 nm, and a thickness direction retardation value Rth of 6133 nm. The anti-glare layer has a thickness of 6 μm and a surface with an uneven structure. In the surface roughness test of the anti-glare layer with the uneven structure, the arithmetic mean curvature Spc at the peak is 50.41 mm. -1 The average length Rsm of the contour curve elements is 15.78 μm. The method for preparing the anti-glare film includes the following steps: (1) Preparation of polyester substrate: PET resin is extruded through an extruder at 285°C to obtain an extruded material. Then, it is die-cast through a casting roll at 33°C to obtain an unstretched sheet. After preheating at 80°C for 30 min, it is stretched 3.5 times in the longitudinal direction (MD) and 3.5 times in the transverse direction (TD) at 130°C. Finally, it is thermocured at 200°C for 33 s to obtain the PET substrate. (2) Preparation of modified wollastonite: S1 Pretreatment: Unmodified wollastonite was vacuum dried at 120℃ for 4 h, and then dispersed in a high-speed mixer at 2000 rpm for 30 min to obtain pretreated unmodified wollastonite. S2 Introduction of amino groups: Anhydrous ethanol and deionized water were mixed at a volume ratio of 12:1, aminosilane coupling agent KH550 was added, and the mixture was magnetically stirred at 350 rpm for 20 min. Then, pretreated unmodified wollastonite (the mass ratio of aminosilane coupling agent KH550 to unmodified wollastonite was 1:18) was added, and the mixture was reacted in a constant temperature water bath at 70℃ and mechanically stirred at 1000 rpm for 3 h. After filtration, washing with anhydrous ethanol, and vacuum drying at 110℃ for 5 h, amino-modified wollastonite was obtained. S3 Introduction of glycidyl methacrylate: Amino-modified wollastonite and glycidyl methacrylate were added to toluene (the mass ratio of amino-modified wollastonite to glycidyl methacrylate was 18:1). The mixture was ultrasonically dispersed at 400 W for 20 min to form a uniform suspension. After purging with nitrogen for 15 min to remove oxygen, the mixture was reacted at 80 °C and 800 rpm for 6 h. The product was then centrifuged, washed four times with acetone, and vacuum dried at 85 °C for 7 h to obtain the modified wollastonite.

[0070] (3) Preparation of coating solution: 50 parts by weight of urethane acrylate (purchased from Arakawa Chemical Industry Co., Ltd., brand name BEAMSET580) and 45 parts by weight of polyfunctional acrylate (purchased from Osaka Organic Chemical Co., Ltd., brand name Viscoat #300) were mixed, 30 parts by weight of methyl isobutyl ketone were added, and the mixture was stirred at 40°C for 15 min. Then, 5 parts by weight of the modified wollastonite obtained in step (2) were added and the mixture was stirred for another 15 min. Then, 12 parts by weight of PMMA-PS copolymer (purchased from Sekisui Chemicals Co., Ltd., brand name SSX-103DXE) were added and the mixture was stirred for 10 min. Then, 2 parts by weight of benzoin and 5 parts by weight of leveling agent (purchased from DIC Co., Ltd., brand name GRANDIC PC 4100) were added and the mixture was stirred at 60°C for 30 min to obtain the coating liquid. (4) Preparation of anti-glare film: The coating liquid obtained in step (3) is roller-coated onto the surface of the polyester substrate obtained in step (1), and subjected to a coating of 280 mJ / cm. 2 The anti-glare film is obtained by UV curing.

[0071] Comparative Example 1 An anti-glare film, which differs from Example 1 in that the longitudinal (MD) stretching ratio is adjusted to 3.7 times and the transverse (TD) stretching ratio is adjusted to 2.8 times during the preparation of the polyester substrate, so that the thickness of the obtained polyester substrate is 43 μm, the in-plane retardation value R0=102 nm, and the thickness direction retardation value Rth=4028 nm. Other materials, parameters and preparation methods are the same as in Example 1.

[0072] Comparative Example 2 An anti-glare film, which differs from Example 1 in that the longitudinal (MD) stretching ratio is adjusted to 2.9 times and the transverse (TD) stretching ratio is adjusted to 2.3 times during the preparation of the polyester substrate, so that the thickness of the obtained polyester substrate is 40 μm, the in-plane retardation value R0=63 nm, and the thickness direction retardation value Rth=3427 nm. Other materials, parameters and preparation methods are the same as in Example 1.

[0073] Comparative Example 3 An anti-glare film, which differs from Example 1 in that the longitudinal (MD) stretching ratio is adjusted to 3.2 times and the transverse (TD) stretching ratio is adjusted to 4.2 times during the preparation of the polyester substrate, so that the thickness of the obtained polyester substrate is 38 μm, the in-plane retardation value R0=1366 nm, and the thickness direction retardation value Rth=7963 nm. Other materials, parameters and preparation methods are the same as in Example 1.

[0074] Comparative Example 4 An anti-glare film differs from Example 1 in that, in the preparation of the coating liquid, the amount of modified wollastonite added is 1 part by weight, and the amount of PMMA-PS copolymer added is 5 parts by weight, so that in the surface roughness test of the anti-glare layer with the uneven structure, the arithmetic mean curvature Spc of the peak vertices is 15.88 mm. -1 The average length Rsm of the contour curve elements was 0.63 μm, and the other substances, parameters and preparation methods were the same as in Example 1.

[0075] Comparative Example 5 An anti-glare film, differing from Example 1, involves the addition of 8 parts by weight of modified wollastonite and 4 parts by weight of PMMA-PS copolymer in the preparation of the coating solution. In the surface roughness test of the anti-glare layer with its uneven structure, the arithmetic mean curvature (Spc) of the peak vertices is 19.34 mm. -1 The average length Rsm of the contour curve elements is 0.88 μm. Other substances, parameters and preparation methods are the same as in Example 1.

[0076] Comparative Example 6 An anti-glare film differs from Example 1 in that, in the preparation of the coating liquid, the amount of modified wollastonite added is 8 parts by weight, and the amount of PMMA-PS copolymer added is 15 parts by weight. In the surface roughness test of the anti-glare layer with its uneven structure, the arithmetic mean curvature Spc of the peak vertices is 256.36 mm. -1 The average length Rsm of the contour curve elements is 40.26 μm. Other substances, parameters and preparation methods are the same as in Example 1.

[0077] Comparative Example 7 An anti-glare film differs from Example 1 in that, in the preparation of the coating liquid, the amount of modified wollastonite added is 2 parts by weight, and the amount of PMMA-PS copolymer added is 16 parts by weight. In the surface roughness test of the anti-glare layer with its uneven structure, the arithmetic mean curvature of the peak vertices, Spc, is 190.75 mm. -1 The average length Rsm of the contour curve elements is 29.38 μm. Other substances, parameters and preparation methods are the same as in Example 1.

[0078] Comparative Example 8 An anti-glare film, differing from Example 1 in that no modified wollastonite was added during the preparation of the coating liquid, and the surface roughness test of the anti-glare layer with the uneven structure showed that the arithmetic mean curvature of the peak vertices, Spc, was 10.22 mm. -1 The average length Rsm of the contour curve elements is 0.52 μm, and other substances, parameters and preparation methods are the same as in Example 1.

[0079] Comparative Example 9 An anti-glare film, differing from Example 1, uses unmodified wollastonite instead of modified wollastonite in the preparation of the coating liquid. In the surface roughness test of the anti-glare layer with its uneven structure, the arithmetic mean curvature Spc at the peak vertices is 244.14 mm. -1 The average length Rsm of the contour curve elements is 28.87 μm. Other substances, parameters and preparation methods are the same as in Example 1.

[0080] Performance testing: (1) Rainbow pattern: The obtained anti-glare film is attached to the polarizing element on the observer side of the liquid crystal monitor (FLATORON IPS226V, LGEelectronics Japan), ensuring that the angle between the slow axis of the polyester substrate and the absorption axis of the polarizing element is 45°. Observation conditions: Environment: Dark area + bright area (illuminance around the monitor: 400 lux); Viewpoint: Frontal view + tilted at approximately 50°; Method: Direct visual inspection + through polarized light-shielding glass (the latter is a rigorous evaluation); Personnel: Ten people observe together, and the evaluation result of the majority is taken; Evaluation criteria (iris grading); ◎: No rainbow pattern; ○: Has rainbow patterns; ×: Has strong iris.

[0081] (2) Anti-glare performance: A black acrylic board was pasted on the reverse side of the anti-glare layer of the obtained anti-glare film, and a fluorescent lamp with an LED light source was shone into the surface of the film. The blurring effect of the reflected fluorescent lamp was evaluated. ◎: The outline of the fluorescent lamp is completely blurred, and the anti-glare effect is good; ○: The fluorescent light is blurry but retains its outline; its anti-glare performance is average. ×: The outline of the fluorescent lamp is clearly visible, but the anti-glare performance is poor.

[0082] (3) Haze: The haze value can be measured using an NDH2000N haze meter. After blank calibration of the haze meter, the sample is cut to an appropriate size and placed in the sample chamber.

[0083] The anti-glare films provided in Examples 1-3 and Comparative Examples 1-9 were tested according to the above test methods, and the test results are shown in Table 1. Table 1 According to the data in Table 1: The anti-glare films provided in Examples 1-3 all have good anti-glare properties, no rainbow patterns, and a haze of only 20.08-21.23%, and also have the advantage of being lightweight and thin.

[0084] Compared with Example 1, the anti-glare films provided in Comparative Examples 1 to 3 all showed stronger rainbow patterns due to the deviation of the delay parameters of the polyester substrate from the range defined by the present invention.

[0085] Compared with Example 1, the anti-glare films provided in Comparative Examples 4 to 7 have an imbalance in the ratio of modified wollastonite and organic particles in the anti-glare layer material. This results in Rsm and Spc being too large or too small in the formed anti-glare layer, making it impossible to form the required uneven structure. Consequently, the anti-glare performance of the final anti-glare film decreases, and the rainbow effect is weakened.

[0086] Compared with Example 1, the anti-glare film provided in Comparative Example 8 does not contain modified wollastonite in its anti-glare layer material. Organic particles alone cannot form a textured structure of suitable size, and can only form a very small surface texture. Therefore, its anti-glare ability is insufficient, and it cannot disperse coherent light, resulting in visible rainbow patterns.

[0087] Compared with Example 1, the anti-glare film provided in Comparative Example 9 uses unmodified wollastonite, which is hydrophilic and prone to agglomeration, and has a large difference in refractive index with the resin. This results in excessively large spacing between the concave and convex structures and excessively steep convex parts, leading to poor anti-glare effect. Furthermore, the strong local reflections cause rainbow patterns.

[0088] The above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. An anti-glare film, characterized in that, The anti-glare film includes a polyester substrate and an anti-glare layer disposed on one side surface of the polyester substrate; The thickness of the polyester substrate is ≤45 μm, the in-plane retardation value R0 is ≤75 nm, and the thickness direction retardation value Rth is ≥5000 nm. The anti-glare layer has an uneven surface. In a surface roughness test of the anti-glare layer with this uneven surface, the arithmetic mean curvature Spc at the peak vertices is 50~150 mm. -1 Furthermore, the average length Rsm of the contour curve elements is 15~60 μm.

2. The anti-glare film according to claim 1, characterized in that, The polyester substrate includes a polyethylene terephthalate substrate.

3. The anti-glare film according to claim 1 or 2, characterized in that, The thickness of the anti-glare layer is 4~6 μm.

4. The anti-glare film according to any one of claims 1 to 3, characterized in that, The anti-glare layer is made of adhesive resin, modified needle-like inorganic particles, and organic particles; Preferably, the anti-glare layer comprises the following components by weight: 75-95 parts by weight of adhesive resin; 3-5 parts by weight of modified needle-shaped inorganic particles; 8-12 parts by weight of organic particles.

5. The anti-glare film according to claim 4, characterized in that, The modified needle-like inorganic particles are prepared by the following method, which includes the following steps: (A1) Unmodified needle-shaped inorganic particles are reacted with an aminosilane coupling agent to obtain amino-modified needle-shaped inorganic particles. (A2) The amino-modified needle-shaped inorganic particles obtained in step (A1) are reacted with glycidyl methacrylate to obtain the modified needle-shaped inorganic particles. Preferably, the unmodified needle-like inorganic particles in step (A1) comprise unmodified wollastonite; Preferably, the aminosilane coupling agent in step (A1) includes any one or a combination of at least two of γ-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane or 3-aminopropylmethyldiethoxysilane. Preferably, the mass ratio of the unmodified needle-shaped inorganic particles to the aminosilane coupling agent in step (A1) is (5~20):1; Preferably, the reaction in step (A1) is carried out in a mixed solvent of ethanol and water; Preferably, the volume ratio of ethanol to water is (9~12):1; Preferably, the reaction in step (A1) is carried out at a temperature of 60-70°C for 2-3 hours. Preferably, the mass ratio of the amino-modified needle-shaped inorganic particles to glycidyl methacrylate in step (A2) is (5~20):1; Preferably, the reaction in step (A2) is carried out under nitrogen protection; Preferably, the reaction in step (A2) is carried out at a temperature of 70-80°C for 5-7 hours.

6. The anti-glare film according to claim 4 or 5, characterized in that, The organic particles include methyl methacrylate-styrene copolymer; Preferably, the adhesive resin comprises urethane acrylate and polyfunctional acrylate.

7. A method for preparing an anti-glare film as described in any one of claims 1 to 6, characterized in that, The preparation method includes: coating an anti-glare layer coating liquid onto one side surface of a polyester substrate, followed by curing treatment to obtain the anti-glare film.

8. The preparation method according to claim 7, characterized in that, The coating method is roller coating. Preferably, the curing process is a UV curing process.

9. A polarizing plate, characterized in that, The polarizer includes the anti-glare film as described in any one of claims 1 to 6.

10. A display device, characterized in that, The display device includes an anti-glare film as described in any one of claims 1 to 6.

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