Anti-glare film

Abstract

This invention discloses an anti-glare film comprising a recycled PET substrate and an anti-glare coating disposed on the recycled PET substrate, wherein the recycled PET contains at least 50% recycled PET resin, and the anti-glare coating comprises an acrylic binder resin and a plurality of amorphous inorganic microparticles. The anti-glare film of this invention forms an uneven surface on the surface of the anti-glare coating by the amorphous inorganic microparticles, which can effectively shield impurity particles and / or microbubbles in the recycled PET film material for application in displays.

Description

[Technical Field]

[0001] The present invention relates to an anti-glare film that can be used in image display devices, and more particularly to an anti-glare film using recycled polyethylene terephthalate (PET) substrate. [Previous Technology]

[0002] Polyethylene terephthalate (PET) is a versatile plastic widely used in various applications, including packaging, textiles, and films. With the increasing demand for environmental sustainability and advancements in recycling technologies, recycled PET reduces reliance on virgin PET and minimizes waste, contributing to sustainability and supporting the circular economy.

[0003] In recent years, PET recycling has become a mature process. However, due to the complex origins of recycled PET, the crushing, melting, and reprocessing process always results in a large number of unmelted, complex fragments, such as residual dyes, adhesives, or other contaminants. These impurities and contaminants may create inclusions or microbubbles in the recycled PET, leading to defects in its performance. Currently, recycled PET is widely used in industries such as packaging, textiles, automotive parts, and construction, but there are still shortcomings and challenges to be addressed in the optical industry.

[0004] Based on the importance of recycled PET for environmental protection, resource conservation, energy reduction and promotion of sustainable circular economy, the present invention provides an optical-grade anti-glare film made of recycled PET substrate that can be used in displays to expand the application fields of recycled PET. [Summary of the Invention]

[0005] The present invention provides an anti-glare film prepared using recycled polyethylene terephthalate (recycled PET) film as a substrate, wherein the anti-glare coating disposed on the recycled PET substrate can effectively shield impurity particles or microbubbles in the recycled PET substrate for use in displays.

[0006] The anti-glare film of the present invention comprises a recycled PET substrate and an anti-glare coating disposed on the recycled PET substrate, wherein the recycled PET substrate comprises at least 50% recycled PET resin, and the anti-glare coating comprises an acrylic binder resin and a plurality of amorphous inorganic microparticles, such as, but not limited to, amorphous silica microparticles, and the amount of such amorphous inorganic microparticles used is between 0.5 parts by weight and 20.0 parts by weight per 100 parts by weight of acrylic binder resin.

[0007] In the anti-glare film of the present invention, the recycled PET substrate has a haze between 0.1% and 3% and a light transmittance of at least 88%, and a thickness between 40 µm and 80 µm.

[0008] The anti-glare film of the present invention has a total haze greater than 15% and a surface haze greater than 12%.

[0009] In the anti-glare film of the present invention, the average particle size of the amorphous inorganic microparticles is between 2.0 µm and 10 µm, the BET specific surface area is between 60 m² / g and 300 m² / g, and the particle size distribution measured by laser method is between 0.2 µm and 25.0 µm.

[0010] In the anti-glare film of the present invention, the amorphous inorganic microparticles form a rough surface with a plurality of irregular protrusions on the surface of the anti-glare coating. The maximum height (Sz) of the surface roughness of the rough surface is between 5.0 µm and 20.0 µm, the arithmetic mean height (Sa) is between 0.10 µm and 1.0 µm, the root mean square gradient (S∆q) is between 0.10° and 1.5°, and the unfolded surface area ratio (Sdr) is between 1.0% and 45.0%.

[0011] In the anti-glare film of the present invention, the thickness of the anti-glare coating is between 2 µm and 10 µm, and preferably between 3 µm and 8 µm.

[0012] In the anti-glare film of the present invention, the recycled PET substrate contains at least 80% recycled PET resin.

[0013] In the anti-glare film of the present invention, the amount of such amorphous inorganic microparticles used is preferably between 1.0 parts by weight and 13.0 parts by weight per 100 parts by weight of acrylic adhesive resin.

[0014] In the anti-glare film of the present invention, the anti-glare coating may further comprise a plurality of spherical organic microparticles, the average particle size of which is between 1.0 µm and 5.0 µm. In the anti-glare coating of the anti-glare film of the present invention, the amount of which is used is between 1.0 parts by weight and 15.0 parts by weight per 100 parts by weight of the acrylic adhesive resin.

[0015] In the anti-glare film of the present invention, the amorphous inorganic microparticles are a plurality of amorphous silicon dioxide microparticles.

[0016] The above-described invention content is intended to provide a simplified summary of this disclosure, enabling the reader to have a basic understanding of it. This invention content is not a complete overview of this disclosure, and its purpose is not to point out important / key elements of the embodiments of the invention or to define the scope of the invention. After referring to the following embodiments, those skilled in the art will easily understand the basic spirit of the invention and the technical means and implementation methods adopted by the invention.

Implementation Method

[0017] To make the description of the present invention more detailed and complete, illustrative descriptions of embodiments and specific examples of the present invention are provided below; however, this is not the only form of implementing or using the specific examples of the present invention. The various embodiments disclosed below can be combined or substituted with each other where advantageous, and other embodiments can be added to one embodiment without further description or explanation.

[0018] The advantages, features and technical methods of the present invention will be more readily understood by referring to exemplary embodiments, and the present invention may be implemented in different forms. Therefore, it should not be understood as limited to the embodiments set forth herein. Rather, the embodiments provided will make this disclosure more thorough, complete and fully convey the scope of the invention to those skilled in the art, and the invention will be defined only by the appended claims.

[0019] Unless otherwise defined, all terms (including technical and scientific terms) and proper nouns used below are substantially the same as those commonly understood by one of ordinary skill in the art to which this invention pertains, and those terms as defined in commonly used dictionaries shall be understood to have meanings consistent with the relevant field, and shall not be interpreted in an overly idealized or overly formal sense unless explicitly defined below.

[0020] In this paper, the maximum height (Sz) of the surface roughness parameter is the sum of the maximum peak height (Sp) and the maximum valley depth (Sv); the arithmetic mean height (Sa) represents the arithmetic mean of the absolute coordinates Z(x, y) within a defined region; the root mean square gradient (S∆q) represents the average magnitude of the local gradient (slope) of the surface; and the unfolded surface area ratio (Sdr) represents the rate of increase of the surface area, which is calculated from the surface area derived from the projected area.

[0021] Furthermore, in this article, the term "(meth)acrylate" refers to methacrylate and acrylate.

[0022] This invention provides an anti-glare film comprising a recycled PET substrate and an anti-glare coating disposed on the recycled PET substrate, wherein the recycled PET substrate comprises at least 50% recycled PET resin, and the anti-glare coating comprises an acrylic binder resin and a plurality of amorphous silica microparticles. The anti-glare film of this invention forms an uneven surface on the surface of the anti-glare coating by the amorphous silica microparticles, which can effectively shield impurity particles and / or microbubbles in the recycled PET substrate for use in displays.

[0023] The anti-glare film of the present invention comprises a recycled PET substrate containing at least 50% recycled PET resin, having a haze between 0.1% and 3% (as described in JISK 7361) and a light transmittance of at least 88% (as described in JISK 7361), and a thickness between 40 µm and 80 µm. The recycled PET substrate used in the anti-glare film of the present invention can be a commercially available product, such as the RESHINE™ series of recycled PET films from Toyobo Co., Ltd. of Japan.

[0024] In the field of known functional optical films, the transparent substrate selected for functional optical films is preferably a film material with a light transmittance of more than 90% and a haze of 0% to meet optical requirements. The anti-glare film of the present invention uses a recycled PET film material containing at least 50% recycled PET resin as the substrate, which has a haze between 0.1% and 3.0% (detected according to the description in JISK 7136) and a light transmittance of at least 88% (detected according to the description in JISK 7361). An anti-glare coating formed by coating with an acrylic binder resin containing amorphous silica microparticles is applied to form an anti-glare film with a total haze greater than 15% and a surface haze greater than 12%. The anti-glare coating of the anti-glare film of the present invention can effectively shield impurity particles and / or microbubbles in the recycled PET film material as the substrate, and can be used in displays.

[0025] In a preferred embodiment of the anti-glare film of the present invention, the recycled PET substrate preferably contains at least 80% recycled PET resin.

[0026] The anti-glare coating of the anti-glare film of the present invention comprises an acrylic adhesive resin and a plurality of amorphous inorganic microparticles, such as, but not limited to, a plurality of amorphous silica microparticles. The amount of such amorphous inorganic microparticles used is between 0.5 parts by weight and 20.0 parts by weight per 100 parts by weight of acrylic adhesive resin, preferably between 1.0 parts by weight and 18.0 parts by weight.

[0027] In the anti-glare film of the present invention, the average particle size of the amorphous inorganic microparticles of the anti-glare coating is between 2.0 µm and 10.0 µm, particularly between 2.0 µm and 8.0 µm, and the BET specific surface area is between 60 m² / g and 100 m² / g. Furthermore, the amorphous inorganic microparticles used in the present invention are preferably microparticles with a wide particle size distribution, for example, a particle size distribution measured by laser method between 0.2 µm and 25.0 µm, and more preferably between 0.3 µm and 20.0 µm. The amorphous inorganic microparticles can be, for example, amorphous silicon dioxide microparticles, such as commercially available Nipsil® SS-50B from Tosoh Silicon Chemicals Co., Ltd., but are not limited thereto. In other embodiments of the present invention, those skilled in the art may also select other amorphous inorganic microparticles as needed.

[0028] In the anti-glare film of the present invention, the amorphous inorganic microparticles of the anti-glare coating form a surface with a plurality of irregular protrusions on the surface of the anti-glare coating. The surface roughness of the surface roughness has a maximum height (Sz) between 5.0 µm and 20.0 µm, an arithmetic mean height (Sa) between 0.10 µm and 1.0 µm, a root mean square gradient (S∆q) between 0.10° and 1.5°, and an unfolded surface area ratio (Sdr) between 1.0% and 45.0%.

[0029] In a preferred embodiment of the anti-glare film of the present invention, the maximum height (Sz) of the surface roughness of the uneven surface formed by the amorphous inorganic microparticles of the anti-glare coating on the surface of the anti-glare coating is between 7.0 µm and 18.0 µm, the arithmetic mean height (Sa) is between 0.20 µm and 0.8 µm, the root mean square gradient (S∆q) is between 0.15° and 1.2°, and the unfolded surface area ratio (Sdr) is between 1.5% and 42.0%.

[0030] In the anti-glare film of the present invention, the thickness of the anti-glare coating on the recycled PET substrate is between 2.0 µm and 10 µm, and preferably between 3.0 µm and 8.0 µm.

[0031] In the anti-glare film of the present invention, the acrylic adhesive resin used in the anti-glare coating comprises a (meth)acrylate composition and an initiator, wherein the (meth)acrylate composition in the acrylic adhesive resin may comprise 35 to 50 parts by weight of a polyurethane (meth)acrylate oligomer with a functionality of 6 to 15, 12 to 20 parts by weight of a (meth)acrylate monomer with a functionality of 3 to 6, and 1.5 to 12 parts by weight of a (meth)acrylate monomer with a functionality of less than 3.

[0032] In one preferred embodiment of the present invention, the polyurethane (meth)acrylate oligomer with a functionality of 6 to 15 is preferably an aliphatic polyurethane (meth)acrylate oligomer with a molecular weight between 1,500 and 4,500.

[0033] In one preferred embodiment of the present invention, the (meth)acrylate monomer with a functionality of 3 to 6 is a (meth)acrylate monomer with a molecular weight of less than 800. Suitable (meth)acrylate monomers with a functionality of 3 to 6 for use in the present invention may be one or a combination of pentaerythritol triacrylate (PETA), dipentaerythritol hexaacrylate (DPHA), or dipentaerythritol pentaacrylate (DPPA), but are not limited thereto.

[0034] In a preferred embodiment of the present invention, the (meth)acrylate monomer with a functionality of less than 3 may be a (meth)acrylate monomer with a functionality of 1 or 2 and a molecular weight of less than 500. This (meth)acrylate monomer with a functionality of less than 3 may preferably be one or a combination of 1,6-hexanediol diacrylate (HDDA), cyclotrihydromethylpropane methyl acetal acrylate (CTFA), 2-phenoxyethyl acrylate (PHEA), or isobornyl acrylate (IBOA), but is not limited thereto.

[0035] Suitable initiators for the acrylate-based binder resin of the present invention can be those widely known and applicable in this art, and there are no particular limitations. For example, acetophenone initiators, diphenyl ketone initiators, phenylacetone initiators, benzoyl initiators, dibenzoxyl initiators, bifunctional α-hydroxy ketone initiators, or acetophosphine oxide initiators can be used. The aforementioned initiators can be used alone or in combination.

[0036] A leveling agent may be added to the anti-glare coating of the anti-glare film of the present invention to improve the coating surface coverage or smoothness. A recoatable leveling agent may also be selectively added to the anti-glare coating of the anti-glare film of the present invention to facilitate the coating of other optical functional layers on the film surface. Fluorine-based, (meth)acrylate-based, or organosilicone-based leveling agents may be used in the anti-glare coating of the anti-glare film of the present invention.

[0037] In the anti-glare film of the present invention, the anti-glare coating may further include a plurality of spherical organic microparticles to adjust the haze. The spherical organic microparticles that can be used in the anti-glare coating of the anti-glare film of the present invention are spherical organic microparticles with an average particle size between 1.0 µm and 5.0 µm. In the anti-glare film of the present invention, the amount of these spherical organic microparticles used is between 1.0 parts by weight and 15.0 parts by weight per 100 parts by weight of the acrylic binder resin, particularly between 2.0 parts by weight and 10.0 parts by weight.

[0038] The spherical organic microparticles suitable for the anti-glare coating of the present invention may be polymethyl methacrylate resin microparticles, polystyrene resin microparticles, styrene-methyl methacrylate copolymer microparticles, melamine microparticles, polyethylene resin microparticles, epoxy resin microparticles, polysiloxane resin microparticles, polyvinylidene fluoride resin, or polyvinyl fluoride resin microparticles.

[0039] Another object of the present invention is to provide a method for preparing an anti-glare film. The method for preparing the anti-glare film of the present invention includes mixing a polyurethane (meth)acrylate oligomer with a functionality of 6 to 15, at least one (meth)acrylate monomer with a functionality of 3 to 6, at least one (meth)acrylate monomer with a functionality of less than 3, and an initiator with a suitable solvent to form an acrylic adhesive resin solution; adding amorphous silica microparticles, a leveling agent, and an organic solvent to the acrylic adhesive resin solution and mixing them to form an anti-glare solution; coating the anti-glare solution onto a recycled PET substrate, drying the recycled PET substrate coated with the anti-glare solution, and then curing it by radiation or electron beam to form an anti-glare coating on the recycled PET substrate to obtain an anti-glare film.

[0040] The solvent used in the preparation method of the anti-glare film of the present invention can be an organic solvent commonly used in this technical field, such as ketones, aliphatic or cycloaliphatic hydrocarbons, aromatic hydrocarbons, ethers, esters or alcohols, etc.

[0041] In other embodiments of the present invention, additives such as antistatic agents, colorants, flame retardants, ultraviolet absorbers, antioxidants, surface modifiers, antibacterial agents, hydrophobic modified silicon dioxide nanoparticles, or defoamers may be added to the prepared anti-glare solution as needed to provide different functional properties.

[0042] The aforementioned method for applying the anti-glare solution can be, for example, roller coating, doctor blade coating, dip coating, roller coating, spin coating, spray coating, slot coating and other coating methods commonly used in this technical field.

[0043] The anti-glare film of the present invention can be further coated with a low refractive index layer on the anti-glare coating to provide anti-reflection function and improve transmittance, so as to improve the contrast of the dark room, but still maintain the original anti-glare performance.

[0044] The following embodiments are used to further illustrate the present invention, but the content of the present invention is not limited thereto.

[0045] Example

[0046] Preparation Example 1: Preparation of Acrylic Adhesive Resin

[0047] An acrylic adhesive resin is formed by mixing and stirring 42 parts by weight of polyurethane acrylate oligomer (functionality 6, molecular weight about 1,600, viscosity about 36,000 cps (25°C), purchased from IGM Resins, Netherlands), 4.5 parts by weight of pentaerythritol triacrylate (PETA), 12 parts by weight of dipentaerythritol hexaacrylate (DPHA), 3 parts by weight of cyclotrimethylolpropane methyl acetal acrylate (CTFA), 4 parts by weight of photoinitiator (Chemcure-481, purchased from Heng Chiao Industry, Taiwan), 24.5 parts by weight of ethyl acetate (EAC) and 10 parts by weight of n-butyl acetate (nBAC) for 1 hour.

[0048] Example 1: Preparation of anti-glare film

[0049] 100 parts by weight of acrylic adhesive resin, 1.5 parts by weight of amorphous silica microparticles (Nipsil® SS-50B, average particle size 4.0 μm, BET specific surface area between 80 m² / g, particle size distribution between 0.7 µm and 15.0 µm as measured by laser method, purchased from Tosoh Silicon Chemicals Co., Ltd., Japan), 0.28 parts by weight of wet dispersion (DisperBYK-2150, solid content 5%, solvent of ethyl acetate and propylene glycol methyl ether acetate, purchased from BYK, Germany), 20 parts by weight of polyether modified acrylate copolymer leveling agent (BYK-UV3535, solid content 10%, solvent of ethyl acetate, purchased from BYK, Germany), 4.5 A silicon dioxide nanoparticle dispersion sol (NanoBYK-3650, average particle size 20nm, solid content 31%, solvent propylene glycol methyl ether acetate / propylene glycol methyl ether, purchased from BYK, Germany), 16.6 parts by weight of ethyl acetate (EAC) and 70 parts by weight of n-butyl acetate (nBAC) were mixed and stirred for 1 hour to achieve uniform dispersion, thus forming an anti-glare coating solution.

[0050] This anti-glare coating liquid was applied to a 50μm recycled PET substrate (RESHINE™, purchased from Toyobo Co., Ltd., Japan) with a haze of 1.9% and a light transmittance of 89%. After drying, it was photocured in a nitrogen atmosphere with a UV lamp with a radiation dose of 298 mJ / cm2 to form an anti-glare coating with a thickness of 4.0μm on the recycled PET substrate.

[0051] The obtained anti-glare film was subjected to the following optical and physical property analyses, and the results are listed in Table 1.

[0052] Thickness measurement: The thickness of the anti-glare film was evaluated using an electronic comparator Extramess 2001 (Mahr Inc., Germany) according to the description in JIS K5600-1-7:2014.

[0053] Measurement of transmittance: The transmittance was evaluated using NDH-2000 (Nippon Denshoku Corp.) according to the description in JIS K7361.

[0054] Measurement of fog: The fog was evaluated using an NDH-2000 (Nippon Denshoku Corp.) according to the description in JIS K7136.

[0055] Measurement of internal and surface haze: A 40μm thick TAC film (manufactured by Fujifilm, T40UZ) is applied to the surface of the anti-glare film using transparent optical adhesive to flatten the uneven surface of the anti-glare film. In this state, the haze is evaluated according to the description of JIS K7136 using NDH-2000 (Nippon Denshoku Corp.) to obtain the internal haze value. Then, the surface haze value is obtained by subtracting the internal haze value from the overall haze value.

[0056] Measurement of gloss: The anti-glare film was attached to the black acrylic plate with transparent optical adhesive. The gloss was measured using a BYK micro-gloss meter according to the description of JIS Z 8741, and gloss values ​​at 20, 60 and 85 degrees were selected.

[0057] Measurement of sharpness: The anti-glare film was cut into 5x8 cm 2 pieces and measured using a SUGA ICM-IT image sharpness meter according to the description of JIS K7374. The values ​​of the 0.125mm, 0.25mm, 0.50mm, 1.00mm and 2.00mm slit measurements were summed.

[0058] Anti-glare performance evaluation of the anti-glare film: The anti-glare film is adhered to a black acrylic board using transparent optical adhesive. Two fluorescent tubes are projected onto the surface of the anti-glare film, and the degree of diffusion of the fluorescent tubes is visually compared. The anti-glare performance of the anti-glare film is evaluated according to the following 5 levels. An anti-glare performance level of Lv.4 or higher is considered passing. Lv.1: The two separate fluorescent tubes are clearly visible, and their outlines are clearly distinguishable as straight lines. Lv.2: The two separate fluorescent tubes are clearly visible, but their outlines are slightly blurred. Lv.3: The two separate fluorescent tubes are visible, and their outlines are vaguely visible, but their shapes are discernible. Lv.4: Two fluorescent tubes are visible, but their shapes cannot be discerned. Lv.5: The two separate fluorescent tubes are neither visible nor their shapes can be discerned.

[0059] Measurement of surface roughness: The anti-glare film was attached to a black acrylic plate with transparent optical adhesive. Four 3D surface roughness images were taken of an area of ​​640x640µm² using an OLYMPUS LEXT OLS5000-SAF 3D laser conjugate microscope and an MPLAPON 20xLEXT objective lens. The arithmetic mean height (Sa), maximum height (Sz), root mean square gradient (tilt angle) (S∆q), and unfolded specific surface area (Sdr) were measured according to the surface roughness description of ISO 25178-2:2012. Each test was performed 5 times and the average value was taken.

[0060] Evaluation of the degree of foreign object obscuring on the panel: After the recycled PET substrate with the foreign object location marked is made into an anti-glare film, it is bonded to the SHARP AQOUS 8K LC-70X500T LCD display with the surface treatment layer removed by transparent optical adhesive. The foreign object is observed from a viewing angle of 0° to 60°. If the obscurity is 100%, it is rated as "extremely excellent" (◎). If the obscurity is 75% or more but less than 100%, it is rated as "excellent" (〇). If the obscurity is 50% or more but less than 75%, it is rated as "acceptable" (Δ). If the obscurity is less than 50%, it is rated as "poor" (×).

[0061] Example 2: Preparation of anti-glare film

[0062] Example 2: An anti-glare film was prepared using the same method as in Example 1, except that 3 parts by weight of amorphous silica microparticles and 0.55 parts by weight of a wetting and dispersing agent were used to prepare the anti-glare coating liquid. This anti-glare coating liquid was applied to a 50 μm recycled PET substrate (RESHINE™, purchased from Toyobo Co., Ltd., Japan) with a haze of 1.9% and a light transmittance of 89%. After drying and curing as in Example 1, an anti-glare coating with a thickness of 4.2 μm was formed on the recycled PET substrate. The obtained anti-glare film was subjected to optical and physical property analysis, and the results are listed in Table 1.

[0063] Example 3: Preparation of anti-glare film

[0064] Example 3: An anti-glare film was prepared using the same method as in Example 1, except that 6 parts by weight of amorphous silica microparticles and 1.1 parts by weight of a wetting and dispersing agent were used to prepare the anti-glare coating liquid. This anti-glare coating liquid was applied to a 50 μm recycled PET substrate (RESHINE™, purchased from Toyobo Co., Ltd., Japan) with a haze of 1.9% and a light transmittance of 89%. After drying and curing as in Example 1, an anti-glare coating with a thickness of 4.2 μm was formed on the recycled PET substrate. The obtained anti-glare film was subjected to optical and physical property analysis, and the results are listed in Table 1.

[0065] Example 4: Preparation of anti-glare film

[0066] Example 4: An anti-glare film was prepared using the same method as in Example 1, except that 7.0 parts by weight of amorphous silica microparticles and 1.9 parts by weight of wetting and dispersing agent were used, and 3.1 parts by weight of spherical polystyrene microparticles (XX-40IK, average particle size 3 μm, purchased from Sekisui Chemicals Co., Ltd., Japan) were added to prepare an anti-glare coating. This anti-glare coating was applied to a 50 μm recycled PET substrate (RESHINE™, purchased from Toyobo Co., Ltd., Japan) with a haze of 1.9% and a light transmittance of 89%. After drying and curing as in Example 1, an anti-glare coating with a thickness of 5.8 μm was formed on the recycled PET substrate. The obtained anti-glare film was subjected to optical and physical property analysis, and the results are listed in Table 1.

[0067] Example 5: Preparation of anti-glare film

[0068] Example 5: An anti-glare film was prepared using the same method as in Example 1, except that 10.6 parts by weight of amorphous silica microparticles and 2.9 parts by weight of a wetting and dispersing agent were used, and 3.3 parts by weight of spherical polystyrene microparticles (XX-40IK, average particle size 3 μm, purchased from Sekisui Chemicals Co., Ltd., Japan) were added to prepare an anti-glare coating. This anti-glare coating was applied to a 50 μm recycled PET substrate (RESHINE™, purchased from Toyobo Co., Ltd., Japan) with a haze of 1.9% and a light transmittance of 89%. After drying and curing as in Example 1, an anti-glare coating with a thickness of 5.8 μm was formed on the recycled PET substrate. The obtained anti-glare film was subjected to optical and physical property analysis, and the results are listed in Table 1.

[0069] Example 6: Preparation of anti-glare film

[0070] Example 6: An anti-glare film was prepared using the same method as in Example 1, except that 3.9 parts by weight of amorphous silica microparticles and 1.1 parts by weight of wetting and dispersing agent were used, and 6.6 parts by weight of spherical polystyrene microparticles (XX-40IK, average particle size 3 μm, purchased from Sekisui Chemicals Co., Ltd., Japan) were added to prepare an anti-glare coating. This anti-glare coating was applied to a 50 μm recycled PET substrate (RESHINE™, purchased from Toyobo Co., Ltd., Japan) with a haze of 1.9% and a light transmittance of 89%. After drying and curing as in Example 1, an anti-glare coating with a thickness of 5.0 μm was formed on the recycled PET substrate. The obtained anti-glare film was subjected to optical and physical property analysis, and the results are listed in Table 1. Table 1: Physical properties of anti-glare films of Examples 1-6 Example 1 2 3 4 5 6 Penetration rate (%) 88.95 88.02 89.39 88.61 90.29 90.01 Total haze (%) 15.01 29.29 54.86 45.11 73.76 46.12 Surface haze (%) 12.48 26.85 51.04 25.99 52.77 15.24 Internal haze (%) 2.53 2.44 3.82 19.12 20.99 30.88 gloss 20 degrees 10.50 3.70 1.10 2.70 0.50 5.00 60 degrees 41.30 21.50 9.20 19.70 5.30 32.40 85 degrees 58.90 36.60 18.50 43.40 21.20 61.50 Clarity 0.125 mm 3.00 2.40 2.30 2.90 2.50 3.80 0.25 mm 1.60 1.20 0.90 1.10 1.60 2.50 0.5 mm 1.70 1.00 1.60 1.40 2.00 2.80 1 mm 3.60 2.90 3.00 3.00 3.90 3.70 2 mm 27.40 12.60 6.60 11.10 6.80 13.50 sum 37.30 20.10 14.40 19.5 16.80 36.30 Surface roughness Maximum height Sz [μm] 9.37 11.02 17.12 12.79 12.16 9.04 Arithmetic mean height Sa [µm] 0.33 0.37 0.42 0.37 0.58 0.30 Root mean square gradient S∆q [ o ] 0.20 0.29 0.51 0.31 0.81 0.22 Surface area ratio Sdr [%] 1.87 3.73 9.84 4.20 24.14 2.16 Anti-glare LV4 LV5 LV5 LV5 LV5 LV5 Foreign body covering ◎ ◎ ◎ ◎ ◎ ◎

[0071] As can be seen from Table 1, the anti-glare films made from recycled PET substrates obtained in Examples 1 to 6 exhibit excellent anti-glare properties and foreign matter coverage by forming a surface with multiple irregular protrusions through amorphous silica microparticles in the anti-glare coating.

[0072] Although the present invention has been disclosed above by way of embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An anti-glare film comprising: a recycled PET substrate containing at least 50% recycled PET resin, wherein the recycled PET substrate has a haze between 0.1% and 3% and a light transmittance of at least 88%; and an anti-glare coating disposed on the recycled PET substrate; wherein, The anti-glare coating comprises an acrylic binder resin and a plurality of amorphous inorganic microparticles, wherein the amount of the amorphous inorganic microparticles used is between 0.5 parts by weight and 20.0 parts by weight per 100 parts by weight of the acrylic binder resin; wherein the amorphous inorganic microparticles form a surface with a plurality of irregular protrusions on the surface of the anti-glare coating, and the unfolded surface area ratio (Sdr) of the surface with irregular protrusions is between 1.0% and 45.0%.

2. The anti-glare film as requested in item 1, wherein the total haze of the anti-glare film is greater than 15% and the surface haze is greater than 12%.

3. The anti-glare film of claim 1, wherein the average particle size of the amorphous inorganic microparticles is between 2.0 μm and 10 μm, the BET specific surface area is between 60 m² / g and 100 m² / g, and the particle size distribution measured by laser method is between 0.2 μm and 25.0 μm.

4. The anti-glare film of claim 1, wherein the maximum height (Sz) of the surface roughness of the uneven surface formed by the amorphous inorganic microparticles on the surface of the anti-glare coating is between 5.0 μm and 20.0 μm, the arithmetic mean height (Sa) is between 0.10 μm and 1.0 μm, and the root mean square gradient (SΔq) is between 0.10° and 1.5°.

5. The anti-glare film of claim 1, wherein the recycled PET substrate contains at least 80% recycled PET resin.

6. The anti-glare film of claim 1, wherein the amount of such amorphous inorganic microparticles used is between 1.0 parts by weight and 18.0 parts by weight per 100 parts by weight of the acrylic adhesive resin.

7. The anti-glare film of claim 1, wherein the anti-glare coating further comprises a plurality of spherical organic microparticles, the amount of which is between 1.0 parts by weight and 15.0 parts by weight per 100 parts by weight of the acrylic adhesive resin.

8. The anti-glare film of claim 7, wherein the average particle size of the spherical organic microparticles is between 1.0 μm and 5.0 μm.

9. The anti-glare film as described in any one of claims 1 to 8, wherein the amorphous inorganic microparticles are a plurality of amorphous silicon dioxide microparticles.