KR20090072354A - Prism Shape Control Method and Controlled Optical Film - Google Patents

Abstract

A control method of a prism shape on an optical film and the optical film controlled by the same are offer excellent forming property such as height or sharpness of prism by forming the prism shape correctly corresponding to a carving shape. A control method of a prism shape on an optical film comprises the following steps of: fusing and emitting polymer resin on the film; molding the extruded film with the prism shape on one side; molding the polymer resin with MI of 50 ~ 90 to insert the film into an end part of a carving pattern(251); and cooling the film in which the prism shape is formed.

Description

Control Method of Prism Shape and Controlled Optical Films {CONTROLLING PRISM SHAPE AND OPTICAL FILM THEREOF}

The present invention relates to a control method of a prism shape and an optical film through the control method, and more particularly, to a control method and an optical film which can be manufactured through the prism shape in an optical film for display.

In information display technology, the display device has occupied the CRT position for more than half a century. However, in the rapidly developing information age, various types of display technologies are required. Not only small measuring instruments but also portable computers are becoming popular, and existing CRT methods such as monitors and TVs are being coped with by flat paneling.

Flat panel display technology is mainly made up of liquid crystal display (LCD), projection display, and plasma display (PDP), which have already secured market in the TV field, and related technologies such as field emission display (FED) and electroluminescent display (ELD). Is being proposed.

Among them, LCD injects liquid crystal between two sheets of glass and applies power to the electrodes installed on the upper and lower glass plates so that the liquid crystal molecular array changes in each pixel and displays an image. Such an LCD display device is usually composed of an LCD panel unit, a driver, and a backlight unit. The LCD panel does not emit light by itself and has only a function of transmitting light on the rear surface. Therefore, in the absence of light, that is, at night or indoors, it is impossible to show an image without the help of a back light. The backlight unit refers to a system for implementing the backlight of the LCD.

The backlight unit is largely composed of a lamp, sheets, a mechanism part, and a driving circuit. Since the lamp alone cannot produce uniform light over the entire area, the light guide plate, diffuser plate, reflector plate, prism, frame, etc., sheets and mechanisms are provided.

There are various methods for the backlight unit. Currently, the most widely used method is a cold cathode fluorescent lamp (CCFT) having a light guiding panel (LGP) printed with a reflection pattern in the middle of the side light method. The cold cathode fluorescent lamp is placed on the edge. At this time, the reflective pattern printed on the light guide plate is printed in a structure to reduce the phenomenon that the brightness difference occurs depending on the position of the lamp is located at the edge of the panel. Although the method of printing the reflective pattern on the light guide plate is high in productivity, the light loss caused by the printing pattern material itself is inferior in efficiency, and the larger the LCD, the worse the uniformity of the overall brightness.

Since the light guide plate method does not provide sufficient brightness, a direct method in which a plurality of lamps are arranged at regular intervals under the diffusion plate is used. In this method, several fluorescent lamps are arranged in a row on the rear surface of the diffusion sheet to improve luminance and improve uniformity than the photometric type. In order to display a bright screen, the backlight light source must be very bright. This is because the light from the light source goes through several steps before reaching the LCD, and loses its original brightness in the process. In addition, the uniformity of light throughout the screen is lost because of the scattering effect.

One way to overcome this problem is to increase the size of the light source, but this is expensive installation cost, high power consumption, and also has a problem of increasing the weight a lot. Thus, several attempts have been made to improve the light source brightness without loss as much as possible during the transmission process.

In flat panel display devices such as LCDs and projection TVs, a diffuser is an optical element that plays an important role in reaching light from the light source to the viewer's eyes. The diffuser plate uniformly distributes the light from the light source and plays an important role in the direct type than in the case of LCD. Structural metering is a structure where light guided by a light guide can be uniformly distributed throughout the screen, but in the case of a direct type, several light sources are distributed below the screen, so that the point just above the light source and the point between the light source and the light source Because there is a difference in the light intensity, you have to offset it.

The most important optical properties of the optical film used to improve visibility in the backlight unit are light transmittance and haze, which require more than 90% total light emission and more than 85% blur for visible light. .

Optical structures for dispersing or diffusing light are generally performed in two ways. First, there are a surface diffuser plate method of refraction or dispersion in a number of directions using surface roughness, and a bulk diffuser plate method having a flat surface and an inherent light dispersing element.

In addition, the prism sheet serves to raise the luminance by collecting light emitted by vertically refracting the light passing through the diffuser plate. Recently, development of a sheet that simultaneously functions as a diffuser plate and a prism sheet has been promoted. .

Various techniques have been proposed for forming the prism shape, which can be divided into injection molding and extrusion molding. International Patent Application WO2005-031446 discloses a method for manufacturing a diffusion plate provided in a liquid crystal display device and provided in a backlight for illuminating a liquid crystal display device, the method comprising: a first injection step of injecting a first resin into a first cylinder; A second injection step of injecting the first resin mixed with a second resin different from the first resin into a second cylinder, the first cylinder into which the first resin is injected by the processing of the first injection step, and The first resin and the second resin are mixed by multi-layer extrusion using the second cylinder into which the first resin into which the second resin is mixed by the second injection step is injected; 1st molding step which shape | molds two sheets of sheet | seats by 1 resin, and surface roll shaping | molding is performed with respect to the surface of the said 1st resin among the said sheets shape | molded by the process of the said 1st molding step, and the prism shape is Second molding The method of manufacturing a diffuser, comprising the tab has been proposed.

According to the extrusion method as described above, a problem arises in the control of the prism shape. As shown in FIG. 1, the shape of the prism should be maintained in the shape of the surface roll during extrusion. After extrusion extrusion, the shape of the hypotenuse swells due to the swelling phenomenon, which is a polymer property, and thus the vertex is not maintained. (See FIG. 1B) The sharp angle of the prism is maintained due to the swelling phenomenon. If not, there is a problem that the brightness is also not controlled due to the distortion of the incident light.

In addition, as shown in FIGS. 3 and 4, the polymer resin or the film cannot be drawn to the inside of the pre-patterned indentation during molding, so that the height of the prism is formed to be lower than the designed value, resulting in deterioration of overall physical properties as an optical material such as luminance. There was this.

Therefore, the development trend of the display device, which has been enlarged in recent years, and the development of the optical film without distortion of the prism shape is desired.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a prism shape control method and an optical film in an optical film in which the shape distortion of the prism is reduced.

Another object of the present invention is to provide a prism shape control method and an optical film that can control the height of the prism.

Another object of the present invention is to provide a prism shape control method and an optical film with improved sharpness of a prism.

Still another object of the present invention is to provide a prism shape control method and an optical film in which residual stress of a polymer, which is a material of an optical film, is controlled.

Still another object of the present invention is to provide a prism shape control method and an optical film having improved physical properties as optical films such as brightness, transparency, and blur.

In order to achieve the above object, the present invention provides a method of controlling a prism shape of an optical film, comprising: melt-extruding a polymer resin into a film; Forming one surface of the extruded film into a prism shape before curing, while maintaining the MI of the polymer resin to 50 to 90 so that the melt-extruded film can be introduced to the distal end of the engraving pattern, and the prism shape It provides a method of controlling the prism shape of the optical film comprising the step of cooling the expressed film.

In another aspect, the present invention provides a control method of the surface temperature of the pattern roll to express the prism shape in the molding step is ± 20 ℃ of the Tg of the polymer resin.

In another aspect, the present invention provides a method of controlling a prism shape of an optical film, comprising: melt-extruding a polymer resin into a film; The extruded film is molded into one prism shape before curing, and the surface temperature of the pattern roll expressing the prism shape is ± 20 ° C. of the Tg of the polymer resin, and the prism shape is cooled. It provides a method of controlling the prism shape of the optical film comprising the step of.

In another aspect, the present invention provides a control method further comprises forming the shape of the hypotenuse of the prism so that the shape of the curvature is formed inside the prism so that the sharpness of the prism vertex is improved in the forming step.

In addition, the present invention is the ratio (Rs) of the half-area area (Fs) of the triangle formed by connecting the vertices of the prism and the bottom end of the prism in a straight line with each other and the half-area area (Rs) of the triangle formed by connecting the vertices and the end with curvature. / Fs) is 0.01 to 10% to provide a control method.

In another aspect, the present invention provides a control method wherein the Rs / Fs is 2 to 4%.

In another aspect, the present invention provides a control method wherein the cooling step is quenched, consisting of 4 to 20 ℃ cooling air.

In another aspect, the present invention provides a control method in which the hypotenuse is formed in the curvature is swelled during the cooling process to deform in a straight line.

In another aspect, the present invention provides a control method in which the curvature is the largest in the section about 20 to 40% from the vertex of the hypotenuse to the base.

The present invention also provides a control method wherein the polymer resin comprises 10 to 90% by weight of copolyester and 10 to 90% by weight of polycarbonate as a blend or composition of copolyester and polycarbonate.

In the present invention, the film is methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, normal butyl methacrylate, normal butyl methyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydride Monomer selected from oxypropyl methacrylate, hydroxyethyl acrylate, acrylamide, metalolacrylamide, glycidyl methacrylate, ethyl acrylate, isobutyl acrylate, normal butyl acrylate and 2-ethylhexyl acrylate It provides a control method further comprising one or more light-diffusing particles selected from the group consisting of bead and silicon-based spherical particles made of homopolymer, copolymer or terpolymer, polyethylene, polystyrene, polypropylene, acryl and olefin copolymer. do.

In another aspect, the present invention provides an optical film produced through the control method.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in the drawings, the same components or parts denote the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

As used herein, the terms "about", "substantially", and the like, are used at, or in close proximity to, numerical values when manufacturing and material tolerances inherent in the meanings indicated are intended to aid the understanding of the invention. Accurate or absolute figures are used to assist in the prevention of unfair use by unscrupulous infringers.

As used herein, the term "film" is used to mean a film, sheet, plate, or the like having a predetermined width and thickness.

In describing the present invention, the prism shape control method by the extrusion method will be described, but the prism shape control method is not limited thereto.

Figure 2 shows a manufacturing process of the optical film according to an embodiment of the present invention.

The film 200 extruded from the T-die 210 may have a prism shape through the engraving pattern 251 of the pattern roll 250. The material of the optical film may be made of a blend or composition of copolyester and polycarbonate, and may specifically include 10 to 90% by weight of copolyester and 10 to 90% by weight of polycarbonate. However, the present specification is described as the material, but is not limited thereto.

The copolyester may be terephthalic acid, naphthalenedicarboxylic acid, cyclohexanedicarboxylic acid or a mixture thereof as the acid component, and ethylene glycol and 1,4-cyclohexanedimethanol (CHDM) may be used as the glycol component. . Non-limiting examples of suitable copolyesters include poly (1,4-cyclohexylenedimethylene terephthalate) (PCT), poly (1,4-cyclohexylenedimethylene naphthalenedicarboxylate) (PCN), poly (1,4-cyclohexylenedimethylene 1,4-cyclohexanedicarboxylate) (PCC) can be used.

Meanwhile, the polycarbonate-based non-limiting example is preferably an aromatic polycarbonate and more preferably may be a polycarbonate containing bisphenol-A [2,2-bis (4-hydroxyphenyl) propane].

The resin made of the material may be extruded to form a prism shape while passing between the first roller and the pattern roller. In the method for shape control of a prism, a means for improving the height of the prism and at the same time improving the sharpness of the vertex shape of the prism is proposed.

2 is a process diagram according to a preferred embodiment of the present invention as the polymer material melted in the T-die 210 is passed between the first roller 230 and the pattern roll 250 while being extruded and then the pattern roll ( It is cooled between 250 and the second roller 270. The prism shape may be indented between the first roller 230 and the pattern roll 250 (region A).

3, the polymer resin is precisely drawn into the pattern of the pattern roll 250 to form a prism shape. However, in the actual process, the resin is stamped of the pattern roll 250 as shown in FIG. You will not be able to enter the pattern correctly. When the problem as shown in FIG. 4 occurs, the height of the vertex in the prism shape is lowered and the sharpness cannot be secured. Therefore, there is a problem that the physical properties of the optical film are reduced.

In order to control the above problems, various factors should be considered, such as the flowability of the polymer resin (in the present specification, the flowability is expressed by the melt index (MI, Melting INDEX)), the temperature of the pattern roll, and the like. Can be separated by arguments.

First, the flowability of the polymer resin has the advantage that the higher the flowability, the easier the prism shape control. In the case of high flowability, since the polymer resin may be introduced to the distal end of the engraving pattern, the prism shape may be accurately reproduced. As a result of many experiments of the present inventors, the MI is preferably 50 to 90. If it is less than the above range, there is a problem that the flowability of the resin is lowered so that the resin cannot be drawn to the distal end of the engraving pattern, and if it exceeds the above range, it is not preferable in that a change of melting conditions is required. On the other hand, MI refers to the melt index of the resin at the point where the first roller 250 and the pattern roll 270 contact.

In addition, the factor to be considered is the temperature of the pattern roll 270, which also means the pattern roll surface temperature at the point where the first roller 250 and the pattern roll 270 contact. The temperature of the pattern roll is preferably ± 20 ° C of Tg of the polymer resin. Since the range is related to the fluidization region of the resin, if it is less than the range, the flowability of the resin will eventually be low, and if the range is exceeded, a temperature to be controlled may be increased, which may cause problems in process control.

On the other hand, Figure 5 shows a prism shape according to an embodiment of the present invention, the line denoted by the reference numeral 300 is a conventional prism engraving line, the identification code 130 is a prism engraving line according to an embodiment of the present invention.

The engraved line according to the present invention may be engraved inwardly as compared to the engraved line of the conventional prism so that a constant curvature is formed in the shape of the hypotenuse 130. The curvature may be designed such that the vicinity of the vertex 110 of the hypotenuse 130 is larger, and more specifically, the curvature may be greatest in a section of about 20 to 40% from the vertex to the base.

The curvature in the engraving line in the optical film according to the present invention is due to the swelling phenomenon caused by the residual stress of the polymer. As shown in FIG. 1B, the shape of the vertex portion of the prism shape of the optical film does not maintain sharpness and finally forms a smoothly rounded shape as the residual resin (residual stress) as the polymer resin crystallizes after extrusion. It is judged to be due to the property to form an entropy stable amorphous state. This is believed to be caused by the polymer chain moving in search of entropy stable holes. As a result, the prism shape of the stamped film after extrusion is affected by the residual stress in the cooling process, and the residual stress is determined to change without maintaining sharpness of the vertex shape.

Therefore, the present inventors have conducted a number of studies to form sharpness of the vertex shape of the prism, and thus, when curvature is formed in the indentation line of the film, it is possible to maintain a considerable degree of sharpness despite the influence of residual stress. I learned. As shown in FIG. 7, when the swelling phenomenon is considered in the cooling process after forming and forming a certain curvature, the hypotenuse of the prism is deformed linearly, and thus the sharpness of the vertices of the prism is maintained to a considerable extent. .

 Meanwhile, the degree of curvature may vary depending on the glass transition temperature, viscosity, extrusion rate, cooling temperature, and the like of the material. Therefore, the degree of curvature is the ratio of the half area (Fs) of the triangle formed by connecting the vertices of the prism and the end of the base in a straight line to each other, and the ratio (Rs / Fs) of the half area (Rs) of the triangle formed by the curvature of the vertices and the end. ) Is preferably 0.01 to 10%. More preferably 2 to 4% (see FIG. 4).

If it is less than the above range, the shape change after residual stress deformation is not significantly different from the conventional prism phenomenon, so it is difficult to secure sharpness of the vertex, and if the above range is exceeded, it is difficult to control the basic shape of the prism.

In addition, in the control of the prism shape, cooling conditions may also be considered between the pattern roll 250 and the second roller 270 (region B) (see FIG. 2). In the region B, as described above, a swelling phenomenon may occur, and thus a sharpness of the prism may be reduced. To this end, the present inventors formed a quenching condition in the region B so that the surface temperature of the film is rapidly lowered. This limits the fluidity of the polymer chain before the polymer chain is swelled due to residual stress as the film is cured, thereby eliminating the possibility of shape change. In addition, even if swelling occurs, the degree of swelling can be controlled by changing the quenching condition. Therefore, it can be used as a control factor with the above drawing conditions.

Specifically, the surface of the embossed shape is further provided with a cooling means such as an air knife to fix the shape expressed on the film. At this time, the cooling temperature is preferably 4 to 20 ℃, more preferably 4 to 10 ℃.

Meanwhile, the optical film according to the present invention may further include light diffusing particles. Since the light diffusing particles should be compatible with a binder (resin) containing particles, organic particles having a similar refractive index to materials and spherical shapes having a low refractive index may be used. The silicon particles were examined and used, and inorganic particles having a material refractive index of 1.50-1.80 can also be used. Particularly, the particle selection to be used is advantageous for solving the problem such as showing the bright line due to the spherical particles having the refractive index difference of 0.1 to 0.2 from the material to improve the shielding, and to maximize the diffusion effect with a relatively small particle amount. It is very advantageous.

The refractive index of the diffusing agent particles used increases the light diffusing effect as the difference between the material and the refractive index is larger, but when the refractive index difference is too large, it is disadvantageous in terms of increasing the luminance, so that the proper refractive index difference is obtained and sometimes similar to the material-refractive index particles. It is preferable to use combining the particle | grains with a big refractive index difference.

Non-limiting examples of light diffusing particles that can be used in the present invention include methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, normal butyl methacrylate, normal butyl methyl methacrylate, acrylic acid, methacrylic acid, Hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxyethyl acrylate, acrylamide, metalolacrylamide, glycidyl methacrylate, ethyl acrylate, isobutyl acrylate, normal butyl acrylate and 2 Homopolymers, copolymers or terpolymers of monomers selected from ethylhexyl acrylate, beads made from copolymers of polyethylene, polystyrene, polypropylene, acrylics and olefins, and silicone-based spherical particles may be used. Preferably, the material is spherical particles between 1 micron and 10 microns having a refractive index difference of about 0.1 to about 0.2. Spherical organic particles having such a refractive index difference can be easily dispersed in the resin because they have densities similar to those of the material used in the present invention (about 1.10 to 1.30 g / cm < 3 >).

The light diffusing particles used in the present invention may use different ones in type and / or size. For example, light diffusion efficiency can be enhanced by mixing two or more kinds of particles having a difference in refractive index rather than a single type. In addition, light diffusing efficiency may be increased by using particles having similar refractive indices and different sizes, and by applying porous particles, the brightness may be increased while maximizing light diffusing efficiency after assembling the backlight unit.

Using particles of uniform particle size requires a large amount of particles to produce a predetermined light diffusing effect, which results in not only economic inefficiency, but also lowering the overall light transmittance. According to one embodiment of the present invention, the size of the light diffusing particles can be used to increase the light diffusion effect while reducing the content of particles by using particles of two sizes of 20 to 30 microns and 1-15 microns.

The light diffusing particles may be used at 0.5 to 30% by weight, preferably 1 to 15% by weight, based on the total weight of the binder. For example, when it is 0.5 weight% or less, a predetermined light-diffusion effect cannot be acquired. On the other hand, when it exceeds 30 weight%, light transmittance falls and particle dispersibility falls and uniform particle dispersion | distribution is not obtained.

As described above, the shape control method of the optical film according to the embodiment of the present invention has an advantage in that the shape of the prism is formed so as to exactly correspond to the shape of the prisms, and the shape reproducibility such as the height or sharpness of the prism is very excellent.

In addition, the control method according to an embodiment of the present invention has the advantage that the optical properties such as blur, brightness, etc. is improved by controlling the shape of the prism.

Hereinafter will be described through specific examples.

Example 1

A 1: 1 ratio of a polycarbonate resin containing a polyester resin mainly containing 1,4-cyclohexanedicarboxylic acid and bisphenol-A [2,2-bis (4-hydroxyphenyl) propane] The phosphate-based heat stabilizer was blended to 0.3 wt% based on the total content. Thereafter, the resin was prepared in a 1.0 mm thick film through a screw coextrusion facility at 270 ℃. Rs / Fs ratio was set to 4%. In addition, MI was set to 80.

Example 2

It was the same as Example 1 and made Rs / Fs ratio 0.01%.

Example 3

It was the same as Example 1 and made Rs / Fs ratio 2%.

Example 4

The same as in Example 1 and the Rs / Fs ratio was 6%.

Example 5

It was the same as Example 1 and made Rs / Fs ratio into 8%.

Example 6

It was the same as Example 1 and made Rs / Fs ratio 10%.

Example 7

As in Example 2, the MI of the extruded resin was 50.

Example 8

As in Example 7, the MI of the extruded resin was 60.

Example 9

As in Example 7, the MI of the extruded resin was 70.

Example 10

As in Example 7, the MI of the extruded resin was 90.

Example 11

The same as in Example 1 and quenched with air cooled on the surface of the film embossed shape.

* Test Methods

1. Transmittance (TT) and haze (Haze): Measured by ASTM D1003 method using NIPPON DENSHOKU 300A analytical equipment in Japan.

2. Luminance: The manufactured film is mounted on the unit (diffusion plate-diffusion film-prism-diffusion film) produced by Taishan LCD (backlight unit manufacturer), and the TOPFL under the condition of 16.5V, Dimming value 2.8V Measured on a stage equipped with BM-7.

3. Lifting efficiency: (height of formed prism / lifting height of pattern roll) * 100

Table 1 shows the results according to the conditions and test methods for each Example and Comparative Example.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

1A and 1B are schematic views of a prism shape according to the prior art.

Figure 2 is a schematic view of the manufacturing process of the optical film according to an embodiment of the present invention.

3 and 4 are schematic diagrams of prismatic engraving according to a preferred embodiment of the present invention.

5 to 7 is a cross-sectional view of the optical film according to an embodiment of the present invention.

<Description of Major Symbols in Drawing>

100: prism 110: vertex

130: hypotenuse 00: optical film

210: T-die 230: first roller

250: pattern roll 251: engraving pattern

270: second roller 300: conventional prism shape

Claims (13)

In the method of controlling the prism shape of the optical film, Melt-extruding the polymer resin into a film; Forming the surface of the extruded film into a prism shape before curing, while maintaining the MI of the polymer resin at 50 to 90 so that the melt-extruded film can be introduced to the distal end of the engraving pattern; The method of controlling the prism shape of the optical film comprising the step of cooling the film in which the prism shape is expressed. The method of claim 1, The surface temperature of the pattern roll to express the prism shape in the molding step is a control method of ± 20 ℃ of the Tg of the polymer resin. In the method of controlling the prism shape of the optical film, Melt-extruding the polymer resin into a film; Forming the surface of the extruded film into a prism shape before curing, wherein the surface temperature of the pattern roll expressing the prism shape is ± 20 ° C. of the Tg of the polymer resin; The method of controlling the prism shape of the optical film comprising the step of cooling the film in which the prism shape is expressed. The method according to any one of claims 1 to 3, And forming the shape of the hypotenuse of the prism to have a curvature shape inside the prism so that the sharpness of the prism vertex is improved in the forming step. The method of claim 4, wherein The curvature is the ratio (Rs / Fs) of the half area (Fs) of the triangle formed by connecting the vertices of the prism and the end of the base in a straight line to each other and the half area (Rs) of the triangle formed by the curvature of the vertices and the end. The control method is 0.01 to 10%. The method of claim 5, The control method of Rs / Fs is 2 to 4%. The method of claim 4, wherein The cooling step is quenched, but a control method consisting of 4 to 20 ℃ cooling air. The method according to any one of claims 1 to 3, The cooling step is quenched, but a control method consisting of 4 to 20 ℃ cooling air. The method of claim 4, wherein The hypotenuse with the curvature formed inwardly is swelled during the cooling process is deformed to a straight line. The method of claim 4, wherein The control method of the curvature is the largest in about 20 to 40% section from the vertex of the hypotenuse to the base. The method according to any one of claims 1 to 3, The polymer resin is a control method comprising 10 to 90% by weight of copolyester and 10 to 90% by weight of polycarbonate as a blend or composition of copolyester and polycarbonate. The method according to any one of claims 1 to 3, The film is methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, normal butyl methacrylate, normal butyl methyl methacrylate, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate Homopolymers of monomers selected from latex, hydroxyethyl acrylate, acrylamide, metalolacrylamide, glycidyl methacrylate, ethyl acrylate, isobutyl acrylate, normal butyl acrylate and 2-ethylhexyl acrylate And a copolymer or terpolymer, polyethylene, polystyrene, polypropylene, bead made of a copolymer of acryl and olefin-based and silicon-based spherical particles further comprising at least one light diffusing particle selected from the group. An optical film produced through the control method according to any one of claims 1 to 12.

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