TWI692501B - Acryl film - Google Patents

Abstract

The present disclosure is an acryl film formed from main dope solution including an acryl resin shown in the following formula 1 and particles of polymethyl methacrylate (PMMA) material, has dynamic friction coefficient 0.7 or less, has excellent roll winding quality and can maintain quality as time passed.

m, n and l are an integer and 1 or more; MMA-PMI-MA wherein, MMA is methyl methacrylate unit, PMI is phenyl male imide unit, and MA is methyl acrylate unit.

Description

Acrylic film

The present invention relates to an acrylic resin film with excellent winding quality, and its film slip characteristics and barrier characteristics in solvent casting.

Recently, a liquid crystal display (LCD) with low power consumption operates at a low voltage and has a light weight. The display is widely used in information display devices such as mobile phones, monitors of personal digital assistant computers, televisions, and the like. The information display device needs to be reliable in harsh environments due to the conditions of use. For example, the liquid crystal display of a car navigation system is compared with the display of a traditional television or a personal computer. Because the temperature and humidity of a car may be very high, strict temperature and humidity conditions are required. Moreover, in the liquid crystal display, it is possible to use a polarizer to indicate, and since the liquid crystal display requires strict temperature and humidity conditions, the polarizer including it needs to have high durability.

The polarizer usually has a laminated structure of a transparent protective film on both sides or one side of a polarizer film that contains a polyvinyl alcohol-based resin having a dichroic pigment adsorbed and oriented. In addition, triacetyl cellulose (TAC) is generally used in the protective film, and the protective film is adhered to the polarizer film via an adhesive containing an aqueous solution of a polyvinyl alcohol-based resin. However, the polarizer lamination protective film containing triacetyl cellulose has high water vapor permeability, and when used in a high humidity and high temperature environment for a long time, the performance of the polarizer will decrease or the protective film will appear. Peeling from polarizer film. In order to solve this problem, it is attempted to use an acrylic resin film having a lower water vapor permeability than the triacetyl cellulose film as the protective film of the polarizer.

The existing acrylic protective film has been manufactured by the melt casting method. When manufactured by the solvent casting method, the thin film resin has advantages in mass production, recycling, and other environmental aspects. The solvent casting method is to dissolve the solvent in an acrylic resin film, press it to a T-die, and dry the solvent in a belt to make a film. Although it is necessary to add better particles, increase the pulse intensity, and ensure slippage to carry the film, the above process is possible. In addition, in this example, the added particles should not melt or deform in the solvent.

Korean Patent No. 1265007 discloses an adhesive polarizer that does not cause light leakage of the image display unit when the usage environment is changed. The acrylic polymer containing the adhesive layer contains (meth)acrylate monomer units. The acrylate monomer unit has a desired amount of bidirectional ring structure, the content of which is determined according to the photoelastic coefficient X of the transparent protective film, and in the case where the phase difference of the transparent protective film changes due to changes in the environment such as heating, the adhesive The layer is suggested to be adjusted to produce a change in phase difference with the opposite code of the transparent protective film.

Korean Patent No. 1114354 discloses a protective film for an optical element, which has a photopolymerizable acrylic polymer, an antistatic agent, and an adhesive layer containing a polymerization initiator. Introducing a photopolymerizable acrylic polymer capable of undergoing a cross-linking reaction between the initiator and the radicals containing the desired proportion of the polymerization initiator, an appropriate amount of antistatic agent can be mixed in The aging process during hardening is omitted, and a protective film is disclosed that can simplify the manufacturing process, and its antistatic property is excellent during peeling or use.

Korean Patent Publication No. 2015-0061591 discloses a technique for manufacturing a polarizer protective film, which has excellent interlayer adhesion and uneven wind resistance, and it has a compound containing a cyclic aliphatic hydrocarbon and an ethylenically unsaturated double coupling agent. The formed first functional layer, and on top of it, a second functional layer formed using a composition containing urethane acrylate, and via the use of a fluorinated aliphatic copolymer having a specific structure on the first functional layer.

Japanese Patent Publication No. 2014-240905 discloses a technique for manufacturing a polarizer, which has excellent adhesion, redo, flatness, and visibility, and the film thickness and elastic modulus are in a specific range, and its protective film A A retardation film B having an acrylic resin as a main component and a cellulose derivative, which is combined with an ether substitute in a polarizer, and a glucose skeleton as a main component, is laminated in sequence, and both films A and B They are connected via an ultraviolet curing adhesive.

At the same time, since the acrylic resin protective film has strong stacking characteristics, if insufficient slip characteristics and barrier characteristics are ensured, the winding quality will be degraded and problems such as bending will occur, thereby maintaining the quality of the film, and therefore it is possible to provide a solution to the problems Of the solution.

Related technical literature

Patent Literature

(Patent Document 1) Korean Patent No. 1265007

(Patent Document 2) Korean Patent No. 1114354

(Patent Document 3) Korean Patent Publication No. 2015-0061591

(Patent Document 4) Japanese Patent Publication No. 2014-240905

The present invention is to solve the technical problems of the related art.

The object of the present invention is to provide an acrylic resin film made by a solvent casting method, which has excellent slip characteristics, barrier characteristics and improved winding quality.

m、n及l是整數且等於或大於1；MMA-PMI-MA其中MMA為甲基丙烯酸甲酯單元，PMI為苯基順丁烯二醯亞胺單元，而MA為丙烯酸甲酯單元。 The present invention provides an acrylic resin film formed by a main doping solution including acrylic resin and polymethyl methacrylate (PMMA) material particles represented by the following formula 1 by a solvent casting method, wherein 100 parts of acrylic acid is used Based on the weight of the resin, the acrylic resin includes 73 to 95 parts by weight of methyl methacrylate units, 3 to 7 parts by weight of phenyl maleimide units and 2 to 20 parts by weight of methyl acrylate units, and The dynamic friction coefficient of the acrylic resin film is 0.7 or lower;

m, n and l are integers and are equal to or greater than 1; MMA-PMI-MA where MMA is a methyl methacrylate unit, PMI is a phenyl maleimide unit, and MA is a methyl acrylate unit.

In addition, the particle size of the polymethyl methacrylate (PMMA) material is 1 to 2.0 μm, and the content of the particles in the main doping solution is preferably 100 to 1000 pm.

In addition, the molecular weight of the acrylic resin of the present invention is preferably 50,000 grams/mole (g/mol) to 2,500,000 grams/mole.

The solvent cast by the solvent is preferably used to mix halogenated hydrocarbon and alcohol.

Furthermore, the present invention provides a method for manufacturing an acrylic resin film, which includes a step of stretching an acrylic resin film. The acrylic resin film is composed of an acrylic resin and polymethyl methacrylate represented by the following formula 1 by a solvent casting method. PMMA) material particles are formed by the main doping solution, wherein based on 100 parts by weight of acrylic resin, the acrylic resin includes 73 to 95 parts by weight of methyl methacrylate units, 3 to 7 parts by weight of phenyl maleate Acetylene imine unit and 2 to 20 parts by weight of methyl acrylate unit, wherein the step of stretching the acrylic resin film is a 30%/min to 90%/min stretching at a stretching temperature of 100°C to 200°C Rate, the acrylic resin film is stretched to a stretch ratio of 120% to 140%, wherein the residual solvent weight ratio before stretching is 5% to 20%.

m、n及l為整數且等於或大於1；MMA-PMI-MA其中MMA為甲基丙烯酸甲酯單元，PMI為苯基順丁烯二醯亞胺單元，而MA為丙烯酸甲酯單元。

m, n and l are integers and are equal to or greater than 1; MMA-PMI-MA where MMA is a methyl methacrylate unit, PMI is a phenyl maleimide unit, and MA is a methyl acrylate unit.

The present invention provides an acrylic resin film having excellent winding quality and ensuring slip characteristics and barrier characteristics.

Fig. 1 is a picture showing the evaluation of the barrier property according to Example 1 of the present invention.

Fig. 2 is a graph showing the evaluation of the barrier property of Comparative Example 1 according to the present invention.

Fig. 3 is a picture showing the evaluation of the barrier property of Comparative Example 2 according to the present invention.

Fig. 4 is a picture showing the evaluation of the barrier property of Comparative Example 3 according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail. However, the description provided herein is for better understanding of the present invention, and the scope of the present invention is not limited thereto.

The inventors of the present invention have conducted thorough research and various experiments to develop an acrylic resin film with excellent film peel strength using a solvent casting method, and found that the molecular weight of the acrylic resin is in the range of 50,000 to 2,500,000 g/mol (g/ Within the range of mol), an acrylic resin film having a specific component is obtained to obtain an acrylic resin film having excellent slip characteristics, barrier characteristics, and improved winding quality, thereby completing the present invention.

m、n及l為整數且等於或大於1； MMA-PMI-MA其中MMA為甲基丙烯酸甲酯單元，PMI為苯基順丁烯二醯亞胺單元，而MA為丙烯酸甲酯單元。 In addition, the acrylic resin film according to the present invention is formed of a main doping solution including acrylic resin and polymethyl methacrylate (PMMA) material particles shown in Formula 1 below, and its dynamic friction coefficient is 0.7 or lower;

m, n and l are integers and are equal to or greater than 1; MMA-PMI-MA where MMA is a methyl methacrylate unit, PMI is a phenyl maleimide unit, and MA is a methyl acrylate unit.

First, the acrylic resin of the present invention will be described. The acrylic resin of the present invention includes methyl methacrylate units, phenyl maleimide units and methyl acrylate units. The acrylic resin is a terpolymer in which the monomer units contained therein are in the form of repeating units .

In terms of optical properties, transparency, activity, machinability, and productivity, it preferably includes 73 to 95 parts by weight of methyl methacrylate units, 3 to 7 parts by weight, based on 100 parts by weight of acrylic resin Phenyl maleimide diimide units and 2 to 20 parts by weight of methyl acrylate units. When the content of the methyl methacrylate unit is within this range, excellent phase difference and optical properties can be obtained. When the content of the methyl methacrylate unit is less than 73 parts by weight, the optical performance of the protective film decreases, and when it exceeds 95 parts by weight, the uniformity of the thickness of the protective film decreases.

In addition, the phenyl maleic diimide unit provides a suitable phase difference and activity between methyl methacrylate and methyl acrylate. Based on 100 parts by weight of acrylic resin, phenyl maleic diacetyl The imine unit is preferably 3 to 7 parts by weight. When the content of the phenyl maleimide diimide unit is within this range, a better phase difference can be obtained.

And, based on 100 parts by weight of acrylic resin, the content of the methyl acrylate unit is preferably 2 to 20 parts by weight. When the content of the methyl acrylate unit is within this range, better thickness uniformity can be obtained.

According to the present invention, by adding silica particles (EVOKIN R812) and additionally adding PMMA material particles as a slip material, slip characteristics and barrier characteristics can be obtained. In this example, the diameter of the PMMA particles is preferably 1 to 2.0 μm. When the diameter of this particle is less than 1 m, the effect of the invention cannot be sufficiently exhibited, and when the diameter of this particle is more than 2 m, the quality of the thin film deteriorates. And, the content of the particles is preferably 100 to 1000 ppm relative to the particles of the main doping solution. When the particle content of the PMMA material of the present invention is less than 100 ppm, the barrier properties between the films are insufficient, and the stacked acrylic resin films may be stuck. When the content of PMMA material particles is higher than 1000 ppm, the surface is too rough, so scratches may occur.

According to the present invention, by adding nanoparticles that are not fused in acrylic resin and solvent and do not deform, the impact strength of the film can be enhanced and the film formation and film portability can be promoted. For the impact strength modifier of the present invention, preferably, core-shell rubber (CSR) particles or silica particles can be used. Also, the diameter of the CSR is preferably 100 to 300 nm. When the CSR diameter is less than 100 nm, the effect of the invention cannot be fully exhibited, and when it is greater than 300 nm, the quality of the protective film will deteriorate.

In addition, the content of the silica particles is preferably 0.005 parts by weight to 0.1 parts by weight (based on 100 parts by weight of the main doping solution), and the content of the core-shell rubber (CSR) particles is preferably 2 parts by weight or more And 10 parts by weight or less (based on 100 parts by weight of the main doping solution). When the nanoparticle content of the present invention is within this range, a protective film excellent in hardness and possibility can be provided.

Furthermore, the core-shell rubber preferably includes a core selected from one or two or more of the group of styrene butadiene rubber, polybutadiene (PBD), and acrylate, and preferably includes A graft copolymer selected from one or two or more of the group consisting of methyl methacrylate (MMA), styrene and acrylate.

In addition, the molecular weight of the acrylic resin of the present invention is preferably 50,000 to 2,500,000 g/mol. When the molecular weight is less than 50,000 g/mol, the productivity of the thin film decreases, and when the molecular weight is greater than 2,500,000 g/mol, the film formation process is not easy. In addition, the acrylic resin of the present invention preferably has a glass transition temperature (Tg) of 120°C or higher. When the glass transition temperature is lower than this range, handleability is lowered and undesirable.

According to the acrylic resin film of the present invention, the film thickness is preferably 10 to 60 micrometers (μm). When the thickness of the acrylic resin film is less than 10 microns, the phase difference characteristic cannot be fully exhibited, and when the thickness of the acrylic resin film is greater than 60 microns, it is not suitable for thin film polarizers.

In addition, the acrylic resin film of the present invention defined by Equation 1 below, the retardation Ro in the plane and the retardation Rth in the thickness direction are measured under the conditions of 23° C. and 55% RH, and it is preferably 10 nm or less .

Equation 1 Ro=(nx-ny)*d Rth={(nx+ny)/2-nz}*d

In Equation 1, d is the thickness of the film (nm), nx is the maximum refractive index of the film in the horizontal direction in the plane, ny is the maximum refractive index in the vertical direction of the plane, and nz is the maximum thickness of the film in the thickness direction Refractive index. When the retardation in the plane and in the thickness direction is greater than 10 nm, the performance of the isotropic optical film deteriorates.

In addition, the acrylic resin of the present invention preferably has a coefficient of dynamic friction of 0.7 or lower. When the coefficient of dynamic friction is greater than 0.7, the slip characteristics of the film will deteriorate.

In the following, the preferred preparation method of the present invention is described in detail.

Preparation of acrylic resin

First, in order to prepare the acrylic resin film of the present invention, a copolymer resin solution containing methyl methacrylate monomer, phenyl maleimide diimide monomer and butyl methacrylate monomer is prepared. In the method for preparing the copolymer monomer, a method for preparing a copolymer resin known in the art, such as suspension polymerization, emulsification polymerization, bulk polymerization, or solution polymerization, can be used.

Preparation of main doping solution containing main coating solution containing acrylic resin and nanometer nanometer particles

According to the present invention, the film is prepared via a solvent casting method (solution film forming method). In the solvent casting method, the film is prepared by dissolving acrylic resin in the casting solvent to obtain the main doping solution, then casting the main doping solution on a support, and evaporating the solvent. In addition, the preparation of the main doping solution is based on mixing acrylic resin and auxiliary additives in the casting solvent.

In the case of preparing a thin film by a solvent casting method, in order to prepare a main doping solution, an organic solvent is preferable for the solvent. For organic solvents, halogenated hydrocarbons are preferably used. For halogenated hydrocarbons, chlorinated hydrocarbons, dichloromethane and chloroform, dichloromethane is best used.

In addition, organic solvents other than halogenated hydrocarbons may be mixed and used. Organic solvents include esters, ketones, ethers, alcohols, and hydrocarbons. For the ester, methyl formate, ethyl formate, propyl formate, pentyl formate, methyl acrylate, ethyl acrylate, pentyl acrylate, etc. can be used. For the ketone, acetone, methyl ethyl ketone, diethyl ketone, diisobutyl ketone, cyclohexanone, methyl cyclohexanone and the like can be used. For ether, diisopropyl ether, dimethoxymethane, dimethoxyethane, 1,4-dioxane, 1,3-dioxolane, tetrahydrofuran, anisole, phenethyl ether, etc. can be used . For alcohol, methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, tert-butanol, 1-pentanol, 2-pentanol, 2-methyl-2 -Butanol, cyclohexanol, 2-fluoroethanol, 2,2,2-trifluoroethanol, 2,2,3,3-tetrafluoro-1-propanol, etc.

More preferably, dichloromethane is used as the main solvent, and alcohol can be used as the secondary solvent. Specifically, the mixed solvent is preferably mixed at a mixing ratio of dichloromethane and alcohol in a weight ratio of 80:20 to 95:5. Furthermore, the mixed solvent is more preferably mixed at a mixing ratio of 85:15 dichloromethane and methanol.

In the preparation method of the acrylic resin film, more auxiliary additives can be used. In the main doping solution, in each preparation process, auxiliary additives may be added according to the use of auxiliary additives such as ultraviolet inhibitors, microparticles, infrared light absorbers, mold release agents, and the like. The specific type of additives is not limited to those commonly used in the art, and its content is preferably used within a range that does not degrade film performance. In addition, the time for adding additives is determined according to the type of additives. The process of finally adding additives to the doping preparation may be carried out.

For the additives of the present invention, PMMA material particles can be used.

The main doping solution obtained through the above method can be prepared by a room temperature dissolution method, a high temperature dissolution method, or a low temperature dissolution method.

Film formation process

In the solvent casting method of the present invention, the main doping solution is cast on the metal support from the nozzle of the pressurized mold, leaving at a predetermined time, and a semi-dry film is formed. The film is then peeled from the metal support, sent to a drying system, and the solvent is removed via drying. Furthermore, the film in a dry state is subjected to the first-axis stretching treatment or the second stretching treatment. By performing the stretching step, the film uniformity and phase difference of the protective film can be increased.

Specifically, the obtained main doping solution is cast on a support via a casting mold to form an acrylic resin sheet. The supporting body can be adapted to evaporate the solvent present in the casting solution to form an acrylic resin film, and at the same time can convey the sheet casting solution extruded from the mold. The support or its surface is made of metal, so the surface is preferably polished. For the support, a steel belt such as a stainless steel belt is preferably used. In addition, regarding the surface temperature of the metal support, if the temperature is higher, the evaporation rate of the solvent present in the undiluted casting solution is faster, but if the temperature is too high, there will be blistering or flatness of the undiluted casting solution The problem of deterioration, although there are different temperatures depending on the solvent, it is preferably 0°C to 75°C, more preferably 5°C to 45°C. For the support, a metal support in the form of a flat conveyor belt can be used.

Furthermore, the acrylic resin sheet formed in the above method undergoes a mild stretching step, and during the preheating process, the glass transition temperature (Tg) of the acrylic resin sheet is 100°C or higher. The acrylic resin film of the present invention undergoes a mild stretching step under the above conditions, and the left and right ends of the film surface damaged by the clip or pin can be carefully removed, and the film can be prepared through the drying step.

In the case of using a flexible stretching device, it is preferable to use a flexible left and right clamping tool to control the clamping length of the film from left to right.

In the case of using the flexible stretching device, the stretching operation can be performed in multiple stages, and it is also preferable to perform biaxial stretching in the casting direction and the width direction. In addition, biaxial stretching can be performed simultaneously or gradually. In the case of "gradual", stretching can be performed in different directions in succession, or stretching in one direction can be divided into multiple stages, and stretching in different directions can be applied at any stage. Simultaneous biaxial stretching involves stretching in one direction and relaxing tension in other directions to be contracted. The stretching ratio of simultaneous biaxial stretching is preferably 1.01 to 2.0 times in both the width direction and the length direction.

Drying devices usually blow hot air onto both surfaces of the net, but microwave heating devices can also be used instead of hot air. However, drying too quickly may easily damage the flatness of the finished film.

The dynamic friction coefficient of the acrylic resin film prepared by the above method in the present invention can be lower than 0.7.

Hereinafter, the present invention will be described in detail with reference to the following examples. However, the examples provided herein are used to illustrate the present invention, and the scope of the present invention is not limited thereto.

Example 1 <Step 1> Preparation of acrylic resin

The acrylic resin shown in Formula 1 below is used.

In this example, it uses 90 parts by weight of MMA units, 5 parts by weight of PMI units, and 5 parts by weight of MA units.

m、n及l為整數且等於或大於1。 Formula 1

m, n and l are integers and are equal to or greater than 1.

<Step 2> Preparation of main doping solution including nanoparticles

Preparation 1 includes 65.19 parts by weight of methylene chloride, 14.31 parts by weight of methanol, 16.45 parts by weight of acrylic resin, 3.69 parts by weight of CSR, 0.33 parts by weight of Tinvuin 928 (BASF company, which is an ultraviolet absorber), 0.03 parts by weight Parts of silicon dioxide (EVOKIN, R812), and 0.01 parts by weight of the main doping solution of PMMA material (SOKEN, MX150).

<Step 3> Film formation process

The main doping solution was cast uniformly on a stainless steel belt support with a width of 2000 mm using a belt flexible device. After the solvent on the stainless steel belt support evaporates, the acrylic resin net is peeled from the stainless steel belt support. Next, grasp the both sides of the acrylic resin web with a tenter, and stretch the acrylic resin web to a stretch ratio of 1.5 times in the TD direction at 130°C. After stretching, the width was maintained for a few seconds. After relaxing the tension in the width direction, let it loosen in the width direction. The acrylic resin web was dried in a drying section set at 90°C for 35 minutes so that the acrylic resin film had a film thickness of 40 μm and had knurling, a width of 1900 mm, an end width of 10 mm, and a height of 8 μm.

Comparative example 1

The acrylic resin film is manufactured in the same manner as in Example 1, except that the PMI and MA content in the acrylic resin film is 0% by weight, while the slip material only adds silica particles (EVOKIN, R812) and does not use PMMA material Particles.

Comparative example 2

The acrylic resin film was manufactured in the same manner as in Example 1, while the slip material only added silica particles (EVOKIN Corporation, R812) and no PMMA material particles were used.

Comparative Example 3

The acrylic resin film was manufactured in the same manner as in Example 1, except that the PMI and MA contents in the acrylic resin film were 0% by weight.

1. Haze measurement

The haze of the acrylic resin films of Example 1 and Comparative Examples 1 to 3 was measured, and the results are shown in Table 1.

2. Dynamic friction coefficient measurement

The dynamic friction coefficients of the acrylic resin films of Example 1 and Comparative Examples 1 to 3 were measured, and the results are shown in Table 1.

3. Barrier measurement

The barrier properties of the acrylic resin films of Example 1 and Comparative Examples 1 to 3 were measured according to the following methods. The results are shown in Table 1 and Figures 1 to 4.

A. Evaluation methods and conditions

The thermal gradient test sample holder is placed on the acrylic resin film air side/belt side laminate (10ea), the bar pressure (approximately 20 X 1cm) at a predetermined pressure (6kg/cm ² ), and the degree of stamping is evaluated (in the room) Press for 10 minutes at warm temperature).

-Measurement environment: temperature 24±2℃, humidity 30±2%

B. Measuring device

-Thermal gradient tester (stick type, pressure 6kg/cm ² )

As described in Table 1, when the acrylic casting resin and PMMA particles are used to prepare a film by the solvent casting method according to the present invention, the haze, dynamic friction coefficient, and barrier properties of the film are all excellent.

Among them, the sliding material EVONIK's R812 is a silicon dioxide material with a small particle size, which plays a key role in sliding characteristics, while SOKEN's MX150 is a PMMA material with a large particle size, which plays a key role in barrier properties Character. In the case of the acrylic resin film, it is very stackable, but its stacking performance is reduced because it is partially composed of BMA with a long molecular chain.

Therefore, after combining these components, the acrylic resin film according to the present invention has excellent slip characteristics, barrier characteristics, and winding quality, and can maintain the quality over time.

Claims (4)

An acrylic resin film consisting of acrylic resin, polymethyl methacrylate (PMMA) material particles as shown in Formula 1 below, and core-shell rubber (CSR) with a diameter of 100 to 300 nm by a solvent casting method It is formed by the main doping solution of nanoparticles of particles or silicon dioxide particles, wherein the acrylic resin includes 73 to 95 parts by weight of methyl methacrylate units and 3 to 7 parts by weight based on 100 parts by weight of acrylic resin Phenyl-butadiene diimide unit and 2 to 20 parts by weight of methyl acrylate unit, wherein the dynamic friction coefficient of the acrylic resin film is 0.7 or lower; wherein the particles of the polymethyl methacrylate (PMMA) material The particle size is 1 to 2.0 μm, and relative to the main doping solution, the content of the PMMA material particles is 100 to 1000 ppm, the content of the silicon dioxide particles is 0.005 to 0.1 parts by weight, and the core-shell rubber (CSR) The content of particles is 2 parts by weight or more and 10 parts by weight or less;

m, n and 1 are integers and are equal to or greater than 1; MMA-PMI-MA where MMA is a methyl methacrylate unit, PMI is a phenyl maleimide unit, and MA is a methyl acrylate unit. The acrylic resin film as described in item 1 of the patent application range, wherein the molecular weight of the acrylic resin is 50,000 g/mol (g/mol) to 2,500,000 g/mol. The acrylic resin film as described in item 1 of the patent application scope, wherein the solvent of the solvent casting method is used to mix halogenated hydrocarbon and alcohol. A method for manufacturing an acrylic resin film, which includes a step of stretching an acrylic resin film, the acrylic resin film is composed of a polymer including an acrylic resin represented by the following formula 1 and having a particle diameter of 1 to 2.0 μm by a solvent casting method It is formed by the main doping solution of PMMA material particles and nano-particles including core-shell rubber (CSR) particles with a diameter of 100 to 300 nm and silica particles, of which 100 parts are acrylic resin By weight, the acrylic resin includes 73 to 95 parts by weight of methyl methacrylate units, 3 to 7 parts by weight of phenyl maleimide units and 2 to 20 parts by weight of methyl acrylate units, wherein The step of stretching the acrylic resin film is to stretch the acrylic resin film to a stretching ratio of 120% to 140% at a stretching temperature of 100°C to 200°C at a stretching rate of 30%/min to 90%/min , Where the residual solvent weight ratio before stretching is 5% to 20%; Formula 1

m, n and 1 are integers and are equal to or greater than 1; MMA-PMI-MA where MMA is a methyl methacrylate unit, PMI is a phenyl maleimide unit, and MA is a methyl acrylate unit.

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