KR100831517B1 - Antiglare Film Manufacturing Method - Google Patents

Abstract

The present invention is coated with a light diffusing layer having a light diffusing function on the outer side of the transparent support for supporting the polarizer, the light diffusion degree (Haze), transparency, diffuse reflection effect, etc. than the polarizing film containing the light diffusing fine particles in the adhesive composition As a method for producing this excellent polarizing film, a polarizing film is manufactured by coating a light diffusion composition on a transparent support using a spray coating head. The present invention adopts a spray coating method through a spray spray head instead of the conventional coating method, and can evenly coat the light diffusing layer, and together with this, it is possible to obtain the effect of preventing the reflection.

Anti-glare film, light diffusion prevention layer, spray coating

Description

Anti-glare Film Manufacturing Method {MANUFACTURING METHOD OF GLARE REDUCING FILM}

1 is a structural diagram of a coating method used in the present invention.

* Explanation of symbols for main parts of the drawings

100: spray coating machine 200: transparent support film

The present invention relates to a method of manufacturing a polarizing film including a light diffusing layer and a polarizing film produced by the above method, and more specifically, by coating an optical diffusion composition containing organic particles or inorganic particles on the outside of the transparent support, It is a method for producing an anti-glare polarizing film excellent in the degree of light diffusion (Haze), transparency (Clarity), diffuse reflection effect and the like than the anti-reflective polarizing film. The present invention relates to a method for manufacturing a polarizing film by coating the light diffusion composition on the transparent support using a coating head in order to more effectively apply a solution in which the particles are dispersed on a transparent support, and a polarizing film using the same.

In a CRT display or a liquid crystal display, the accelerated electrons collide with the phosphor inside the front glass to emit energy, and the phosphor emits light, and red, green, and blue light are emitted to the front side. When the display is used indoors, when a light such as a fluorescent light is incident on the display surface and the light is reflected, the screen is blinded and the screen is difficult to recognize.

On the transparent substrate film, an anti-glare film formed by applying a resin coating material containing silica to form a light diffusing layer is disposed on the front surface of the display, and a method of reducing glare of the screen by diffusing external light, which is a cause of glare, is commonly used. Doing.

Conventionally, there has been a case of dispersing a light diffusing material in a transparent or translucent resin body (Japanese Patent Laid-Open Publication No. 55-46707), and a method of securing light diffusivity using reflection on a pearl pigment surface by dispersing a pearl pigment in a transparent material. (Japanese Patent Laid-Open No. 55-84975). However, this conventional technology has a problem of reducing the concentration effect of the lens sheet used to improve the front brightness of the transmissive liquid crystal display device because the reflection performance is secured by backscattering.

In addition, when coating using light diffusing fine particles, in the case of using a conventional coating method such as cap, lip, die, micro gravure, there is a problem that the light diffusing layer coated on the polarizing film is uneven and irregular light diffusion effect. In addition, when the light diffusion layer is present between the polarizing film and the LCD film, it is difficult to secure a light diffusion effect of a predetermined level or more due to the generation of fine voids.

The present invention has been made to solve the problems of the prior art, it adopted a spray coating method through the spray spray head instead of the conventional coating method. It is an object of the present invention to spray-coated a light diffusing composition obtained by mixing organic particles of metal or polymer beads such as inorganic oxides with a hard coating resin through a coating head to uniformly coat a light diffusing layer on a transparent support. In addition, the coated light diffusing layer allows the use of the same light diffusing fine particles as compared with the light diffusing layer existing inside the liquid crystal display device, thereby achieving a larger diffusion effect and viewing angle improvement. In addition, an object of the present invention is to obtain an anti-reflective effect through the light diffusion layer.

An object of the present invention is to prepare a light-diffusion composition comprising a mixture of inorganic particles or polymer organic particles, such as hard coating resin; A light diffusing layer coating step of forming a light diffusing layer by coating the light diffusing composition on the polarizer protective layer by using a coating head portion capable of adjusting spray pressure and spray amount; Adhering the polarizer protective layer including the polarizer and the light diffusion layer; And a curing step of curing the polarizing film including the light diffusing layer by thermal curing or photocuring, and the polarizing film manufacturing method comprising the light diffusing layer and the polarizing film using the same.

Hereinafter, the technical configuration of the present invention will be described in detail.

The present invention relates to a polarizing film manufacturing method comprising a light diffusing layer and a polarizing film manufactured using the same. The polarizing film manufacturing method according to the present invention comprises a manufacturing step, a light diffusing layer coating step, an adhesive step, and a curing step of the light diffusion composition in which inorganic particles or polymer organic particles are mixed with a hard coating resin. Each step is described below.

(1) step of preparing the light diffusion composition

Metal particles such as inorganic particles or polymer organic particles are mixed with an ultraviolet curable resin which is commonly used to prevent light from being reflected from the surface of the polarizing film to cause glare. Examples of the inorganic particles include SiO ₂ and TiO ₂ , and organic particles may include styrene beads, melamine beads, acryl beads, acrylic-styrene beads, polycarbonate beads, polyethylene beads, polyvinyl chloride beads, and the like. Styrene beads are preferred. Since the fine particles are all non-aggregated, effective scattering is obtained by the difference in refractive index with the translucent resin, thereby preventing surface light emission. Each material included in the light diffusion composition will be described in detail below.

(2) light diffusion layer coating step

In order to coat the light diffusion layer, the present invention uses a spray coating method.

Spray coating method used to form the light diffusion layer in the present invention is as shown in FIG. 1 is a structural diagram illustrating a method in which a light diffusing layer is coated on a polarizing film 200 using spray coating and inline coating. As shown in FIG. 1, when using two or more coating heads 100, the thickness and durability of the light diffusion layer may be adjusted by adjusting the spray amount or spray pressure of the light diffusion composition. In addition, by using the in-line coating method, while the film is continuously moving in the same direction and speed, a method in which the mixed solution is sprayed and coated in the coating head on the top of the film was adopted.

The spray coating method of the present invention is a general air orbit wet coating (wet coating), for example, fine pores generated in the knife (Knife), comma (Die), micro gravure, gravure, nip (nip) method, etc. Eliminate or minimize ignition. In addition, air filling the voids can cause a change in the refractive index and scatter the light to reduce the overall transmittance.

In the case of using the spray coating method, two or more coating heads may be disposed on the film at regular intervals to uniformly form a coating layer. The coating head is configured to eject the coating composition through the porous membrane, and has a control unit for controlling the amount of the composition ejection on the front of the coating head. Therefore, it is configured to eject a certain amount of the coating composition for a certain area. This is very advantageous to control the amount of coating composition and the coating layer thickness because it has a different configuration from the sprays commonly used. In addition, the coating head is used as the coating head when the coating composition is introduced, it may be used to dry the coating layer by adjusting the air flow rate and wind speed after the coating is completed by flowing out the wind.

When two or more coating heads are used, the coating composition sprayed through the coating head is preferably the same composition, but it is also possible to use different compositions. In the case of sequentially performing the first coating, the second coating, etc. using the same composition, it is possible to more effectively eliminate the micro-pore phenomenon by the conventional method. For example, primary coating may be performed using an inorganic bead coating composition, and secondary coating may be performed using an acrylic or styrene coating composition.

The coating layer of the antiglare film includes a plurality of inorganic particles and organic particles, and a predetermined region of the antiglare film is preferably disposed to have particles that are symmetric to each other. When the particles of the coating layer have mutual symmetry, an excellent reflection characteristic is obtained, so that the antiglare function is effectively obtained, and an antiglare film which sufficiently prevents the visibility deterioration due to diffusing or diffraction of light can be obtained. Moreover, since the anti-glare film looks rainbow-colored by the diffraction of the light which reflected the distribution of the distance between the peaks and protrusions caused by the particle | grains, visibility tends to fall. Therefore, it is important to appropriately adjust the distance distribution between the irregularities of the coating layer containing the inorganic particles and the organic particles. In the present invention, it is most preferable to arrange the particles so that the particles are symmetrical with each other in a period of 50 to 300 μm.

The light diffusing composition used in the present invention comprises a curable resin, a curing agent and light diffusing fine particles. Look at each component of the light diffusion composition used in the coating step.

<Curable resin>

The curable resin used in the present invention uses at least one of a thermosetting resin or a photocurable resin.

Thermosetting resins and photocurable resins generally use known resins. Among the thermosetting resins, polycondensation type resins include phenol resins, urea resins, melamine resins, and the like, and epoxy resins, polyester resins, and the like. In this invention, these can be used individually or in mixture. As the photocurable resin, UV curable resin is generally used. As a photocurable resin, unsaturated polyester resin, a polyfunctional acrylate resin, an epoxy acrylic resin, an epoxy acrylate resin, etc. can be used individually or in mixture. Although the urethane-acrylate resin was used in the present invention, usable curable resins are not limited to the listed resins as long as they exhibit the same effect.

In this invention, 35 weight% of ultraviolet curable resins are mixed and used with respect to 65 weight% of xylene.

<Hardener>

The curing agent in the present invention can be selected and mixed as appropriate depending on the form of the functional group present in the thermosetting resin or photocurable resin, preferably isocyanate compound, epoxy compound, aziridine compound, metal chelate compound, metal alkoxide Metal salts, amine compounds, hydrazine compounds and the like are used alone or in combination.

The isocyanate compound in the present invention is an aliphatic diisocyanate compound such as aromatic diisocyanate compound such as diphenylmethane isocyanate, xylene diisocyanate, and hexamethyl diisocyanate. ) May be used alone or in combination.

In addition, the epoxy compound in the present invention is a polyethylene glycol diglycidyl ether (diglycidyl ether), diglycidyl ether (diglycidyl ether), trimethylol propane triglycidyl ether (trimethylol propane triglycidyl ether) and the like alone Or mixed.

It is preferable to use 0.3 to 5.0 weight% of hardening | curing agents in this invention with respect to 100 weight% of light-diffusion compositions. In the present invention, the curing agent is an additive used to control the molecular weight or chain structure of the light-diffusion composition, and when the curing agent is used in the above-described range, the effect of suppressing phase separation and the like is prominent.

<Light Diffusion Particles>

The light diffusing fine particles in the present invention are inorganic particles such as silica, calcium carbonate, aluminum hydroxide, magnesium hydroxide, clay, talc, titanium dioxide, cesium oxide, organic particles such as acrylic resin, styrene resin, epoxy resin, silicone resin, or the like. Organic white pigments are used. In addition, when the acrylic polymer is the main component of the adhesive composition, polymer beads satisfying the refractive index and the degree of diffusion required for light diffusion are preferable. The polymer beads include melamine beads (refractive index: 1.57), acrylic beads (refractive index: 1.47), acrylic-styrene beads (refractive index: 1.54), polycarbonate beads, polyethylene beads, vinyl chloride beads, and the like.

It is preferable to use the light-diffusion microparticles | fine-particles suitable for the spray-coating system, and, as for the light-diffusion microparticles | fine-particles used by this invention, it is more preferable to use acryl-type beads or styrene beads. In the present invention, it is also preferable to use inorganic beads as light diffusing fine particles. The acrylic beads, styrene beads or inorganic beads may be used alone or in combination.

Acrylic beads used in the present invention are ethyl acrylate, butyl acrylate, amyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, cyclohexyl acrylate, benzyl acrylate, butyl methacrylate, 2-ethylhexyl meta Acrylate, cyclohexyl methacrylate, benzyl hexyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, methyl acrylate, methyl methacrylate, benzyl methacrylate, vinyl acetate, styrene, acrylonitrile, acrylic acid , Methacrylic acid, maleic anhydride, itaconic acid, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, N-methylol acrylamide, acrylamide, methacrylamide, glycidyl Amide, lauryl acrylate, ethoxydiethylene glycol acrylate, methoxy triethylene glycol Acrylate, phenoxyethyl acrylate, tetrahydrofuryl acrylate, isobornyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxy-3-phenoxy acrylate, neopentyl Glycol diacrylate, 1,6-hexanediol diacrylate, trimethylol propane triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, trimethylolpropane acrylate benzoate , 2-ethylhexyl methacrylate, n-stearyl methacrylate, cyclohexyl methacrylate, tetrahydrofurfuryl methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxybutyl methacrylate, 1 , 6-hexanediol dimethacrylate, trimethylolpropane trimethacrylate, glycerin dimethacrylate Agent, glycerin dimethacrylate acrylate hexamethylene diisocyanate, pentaerythritol triacrylate is preferably a monomer or oligomer of hexamethylene diisocyanate used alone or in combination.

In addition, the styrene beads used in the present invention may be used alone or in combination with styrene, α-methylstyrene, α-ethylstyrene, o-ethylstyrene, p-ethylstyrene, 2,4-dimethylstyrene or vinyl toluene. desirable.

In addition, the inorganic particles used in the present invention are silica (SiO ₂ ), titanium oxide (TiO ₂ ), zirconium oxide (ZrO ₂ ), manganese oxide (MnO ₂ ), cobalt oxide (CoO), iron oxide (Fe ₂ O ₃ ) It is preferable to use etc. individually or in mixture. In particular, in the present invention, it is preferable to use iron oxide.

The content of the light diffusing fine particles is preferably 1% by weight to 5% by weight with respect to 100% by weight of the light diffusion composition, and more preferably 2% by weight to 3% by weight. When the content of the light diffusing fine particles is less than 1% by weight, it is difficult to expect a light diffusing effect, and when the content of the light diffusing fine particles is larger than 5% by weight, the light diffusing fine particles may be excessively reduced to reduce transmittance.

Through the light diffusing fine particles used in the present invention, a polarizing film having excellent dispersibility and uniformity and high light diffusivity can be obtained. In addition, the shape of the light diffusing fine particles is preferably spherical or acicular.

The particle diameter of the light-diffusion fine particles is preferably 1 µm to 4 µm, more preferably 2 µm to 3 µm. If the particle diameter of the light-diffusion fine particles is smaller than 1 μm, it is difficult to obtain a satisfactory light-diffusion effect, and the light-diffusion is lowered, so that the image is discolored to aluminum color. In addition, when the particle diameter of the light-diffusion fine particles is larger than 4 μm, the background of the screen tends to be rough due to the light-diffusion fine particles in the adhesive composition, and the image contrast is deteriorated.

In the present invention, the refractive index of the light diffusing fine particles preferably has a difference of 0.01 to 0.4 with respect to the refractive index of the light diffusing composition. More preferable refractive index difference is 0.07-0.3. If the difference in refractive index is less than 0.01, light diffusion does not occur and if the difference in refractive index is greater than 0.4, the internal scattering is excessively large and the total light transmittance is weakened. In addition, the refractive index of the light diffusing fine particles must be lower than the refractive index of the light diffusing composition to easily adjust the refractive index and improve productivity.

<Dispersant>

In the present invention, an organic solvent that is a dispersant is used to apply the hard coating layer to the compensation film. In the present invention, it is preferable to use an organic solvent in which the hard coat layer composition can be evenly dispersed. The organic solvent is selected in consideration of the improvement of the coating property, adhesion, and hardness strengthening function of the hard coating layer.

The organic solvent used in the present invention is a C1-8 saturated hydrocarbon alcohol, such as alcohol-based methanol, isopropanol, butanol, t-butanol, isobutanol, acetone of ketones, methyl ethyl ketone, methyl isobutyl ketone or the like. Saturated hydrocarbon-based diketones having 1 to 8 carbon atoms, such as saturated hydrocarbon ketones of 1 to 8 and acetyl acetone, ethyl acetate of esters, and ethyl cellosolves of 1 to 8 saturated hydrocarbon-based esters such as butyl acetate and ether alcohols. , Methyl cellosolve, butyl cellosolve, 1-methoxy-2-propanol, and other N-methyl pyrrolidone, ethyl cellosolve acetate, diacetone alcohol and the like are used alone or in combination. Moreover, benzene, toluene, xylene, ethylbenzene, etc. which correspond to an aromatic hydrocarbon can also be used individually or in mixture.

The organic solvent is preferably 20 parts by weight to 110 parts by weight with respect to 100 parts by weight of the hard coating layer composition, and more preferably 30 parts by weight to 80 parts by weight. When the content of the organic solvent is less than 20 parts by weight with respect to 100 parts by weight of the hard coat layer composition, the viscosity is low, so that applicability and adhesion with the compensation film are lowered. When the content of the organic solvent is greater than 110 parts by weight, the amount of the organic solvent is greater than that of the hard coating layer composition. Profitability is inferior by using

It is preferable that the thickness of the hard-coated compensation film prepared by mixing the composition as described above is 30 to 60 μm, more preferably 45 to 55 μm, and the thickness of the hard coating layer is 3 to 15 μm. More preferably, it is 5-10 micrometers. When the thickness of the hard coating layer is less than 3㎛ is too thin, it is difficult to secure scratch resistance and chemical resistance, when larger than 15㎛ has a disadvantage in that the economic efficiency during spin coating. The above thickness is advantageous for scratching and chemical resistance and the surface hardness is most suitable.

Additionally, the hard coating composition may contain an antifoaming agent, a coating improver, a thickener, an organic lubricant, organic polymer particles, an antioxidant, an ultraviolet absorber, a blowing agent dye, and the like.

It is prepared by the in-line method using the spray coating method as described above.

<Leveling agent>

In the present invention, to level the surface of the hard coating layer, a leveling agent is mixed and used in the hard coating layer composition. The leveling agent can be used by mixing a ketone or an ester solvent with a silicone resin. As a leveling agent by this invention, it is preferable to use a silicone diacrylate and a silicone polyacrylate compound individually or in mixture.

The content of the leveling agent is preferably 0.1% to 3% by weight, more preferably 0.5% to 2% by weight in 100% by weight of the light diffusion composition. If the leveling agent is less than 0.1% by weight, it is difficult to expect the leveling effect, and when it is 3% by weight or more, the hardness may be weakened.

(4) drying and curing step

Drying according to the invention evaporates the solvent by wind or heating. As the solvent in the coating composition decreases, the light diffusing composition that has been dissolved begins to cause gelation. Therefore, the coating layer is made of lumps made of the light diffusing composition and the light transmitting resin. When gelling, the drying rate of the solvent in the coating composition is higher than that of the poor solvent, or the drying temperature is high, or the air volume is strong, the solvent decreases rapidly and agglomerates of the translucent resin and the light-diffusion composition are formed rapidly, resulting in a relatively large amount. Although unevenness is formed, the drying rate of the solvent in the coating composition is not greater than the poor solvent, or the gentler the drying conditions, the slower the rate of solvent reduction in the coating composition is to form a relatively small unevenness.

The curing step according to the present invention uses a curing method commonly used in the manufacturing process of the polarizing film.

In the light diffusion composition according to the present invention, since the thermosetting resin or the photocurable resin is included, the curing step is performed by thermosetting or UV curing. Thermal curing and UV curing may proceed sequentially or simultaneously. In addition, the curable resin and the curing agent may vary according to the difference in the curing method, the range is not limited to the curable resin and the curing agent specifically mentioned in the present invention.

The polarizing film made by the polarizing film manufacturing method by this invention also corresponds to the scope of the present invention. In addition, the image display device to which the polarizing film made by the polarizing film manufacturing method of the present invention is applied also falls within the scope of the present invention. The image display device according to the present invention is a cathode-ray tube (CRT), a liquid crystal display (LCD), a plasma display panel (PDP) and an organic light emitting display (OLED) at least one of the group consisting of organic light emitting diodes).

Hereinafter, the present invention will be described in more detail with reference to preferred examples of the present invention and comparative examples compared with the present invention.

Example 1

A mixed solution is prepared by mixing 65% by weight of xylene with 35% by weight of UV curable resin, 2% by weight of SiO ₂ (size: 1-4 μm), a leveling agent, and a dispersant. The prepared liquid mixture is coated on a transparent polarizer protective film by spray coating. After drying, the coated film is cured by irradiation with ultraviolet rays to prepare a 5 μm thick film.

Example 2

A mixed solution is prepared by mixing 65% by weight of xylene with 35% by weight of UV curable resin, 2% by weight of SiO ₂ (size: 1-4 μm), a leveling agent, and a dispersant. The prepared liquid mixture is coated on a transparent polarizer protective film by spray coating. After drying, the coated film is cured by irradiating with ultraviolet rays to prepare a 7 μm thick film.

Example 3

A mixed solution is prepared by mixing 65% by weight of xylene with 35% by weight of UV curable resin, 2% by weight of SiO ₂ (size: 1-4 μm), a leveling agent, and a dispersant. The prepared liquid mixture is coated on a transparent polarizer protective film by spray coating. The coated film is dried and then cured by irradiation with ultraviolet rays to prepare a 10 μm thick film.

Example 4

65 wt% of xylene, 35 wt% of ultraviolet curable resin, 3 wt% of SiO ₂ (size: 1-4 μm), a leveling agent, and a dispersant were mixed to prepare a mixed solution. The prepared liquid mixture is coated on a transparent polarizer protective film by spray coating. After drying, the coated film is cured by irradiation with ultraviolet rays to prepare a 5 μm thick film.

Example 5

65 wt% of xylene, 35 wt% of ultraviolet curable resin, 3 wt% of SiO ₂ (size: 1-4 μm), a leveling agent, and a dispersant were mixed to prepare a mixed solution. The prepared liquid mixture is coated on a transparent polarizer protective film by spray coating. After drying, the coated film is cured by irradiating with ultraviolet rays to prepare a 7 μm thick film.

Example 6

65 wt% of xylene, 35 wt% of ultraviolet curable resin, 3 wt% of SiO ₂ (size: 1-4 μm), a leveling agent, and a dispersant were mixed to prepare a mixed solution. The prepared liquid mixture is coated on a transparent polarizer protective film by spray coating. The coated film is dried and then cured by irradiation with ultraviolet rays to prepare a 10 μm thick film.

Comparative Example

In order to implement the anti-glare function in the polarizing film, to produce an anti-glare film formed with a hard coating layer between the polarizer and the protective film, in the comparative example was produced an anti-glare film using a contact coating head.

[Table 1] is a table showing the adhesion, transmittance, cloudiness, transparency and the like of the polarizing film corresponding to the embodiment made by the present invention and the polarizing film corresponding to the comparative example.

The adhesiveness of Examples 1-6 and a comparative example is all the same. In this case, the transmittances of Examples 1, 2, and 3 all have values smaller than those of Comparative Examples. In addition, Examples 1, 2, 3, 5, and 6 have a low cloudiness compared to the comparative example. The transparency according to the present invention was found to be generally higher than the comparative example. When comparing the transmittance, cloudiness, and transparency in Examples and Comparative Examples having the same degree of adhesion, the Examples according to the present invention was found to have a similar or higher efficiency than the Comparative Example.

Adhesive Transmittance (%) Cloudiness (%) Transparency (%) Gloss 20 ° 60 ° 85 ° Example 1 100/100 93.77 25.3 46.30 13.53 35.53 44.23 Example 2 100/100 93.90 13.8 57.23 23.16 48.52 60.98 Example 3 100/100 93.84 4.10 73.63 53.14 97.96 82.20 Example 4 100/100 93.90 30.53 35.90 6.40 25.67 30.70 Example 5 100/100 93.97 18.68 54.13 17.52 42.02 51.22 Example 6 100/100 93.97 8.57 58.33 27.06 58.42 62.18 Comparative example 100/100 94.06 26.50 45.00 14.24 36.82 42.20

In the above, this invention was demonstrated in detail with reference to an Example and a comparative example centering on a structure. However, the scope of the present invention is not limited to the above embodiments, but may be embodied in various forms of embodiments within the scope of the appended claims. Without departing from the gist of the invention as claimed in the claims, any person of ordinary skill in the art is considered to be within the scope of the claims described in the present invention to the extent possible to vary.

Through the above technical configuration, the present invention evenly coats the light-diffusion composition on the polarizer protective layer by using a coating head capable of controlling spray pressure and spray amount, and a method of manufacturing a polarizing film and an effect of providing a polarizing film manufactured by such a method. There is. In addition, through the light diffusion layer coated by the present invention it is also possible to obtain a diffuse reflection prevention and viewing angle improvement effect. In addition, the light diffusion layer (Haze), the transparency (Clarity), the viewing angle and the like than the light diffusion layer existing in the liquid crystal display device.

Claims (9)

2 wt% to 3 wt%, particle diameter of 2 μm to 3 μm, and refractive index of the light diffusing composition with respect to 100 wt% of the light diffusing composition including the hard coating resin, the curing agent, and the light diffusing fine particles. A step of preparing a light diffusing composition comprising light diffusing fine particles which are inorganic particles or polymer organic particles smaller than 0.07 to 0.4 and a curing agent comprising 0.3 wt% to 5.0 wt% with respect to 100 wt% of the light diffusing composition;  The light diffusion composition is dispersed in an organic solvent having a weight of 20 parts to 110 parts by weight based on 100 parts by weight of the light diffusion composition, and then the light diffusion composition is coated on the transparent support using two coating heads capable of controlling the spray pressure and the spray amount. A light diffusion layer coating step of forming a light diffusion layer at intervals of 50 μm to 300 μm between the uneven distance distribution of the coating layer; Bonding the transparent support including the light diffusing layer to the polarizer; And Method for producing a polarizing film comprising a light diffusing layer comprising a curing step of curing the polarizing film comprising the light diffusing layer with a curing agent using thermal curing or photocuring. delete delete delete The method of claim 1, The inorganic particles are at least one of silica (SiO ₂ ), titanium oxide (TiO ₂ ), zirconium oxide (ZrO ₂ ), manganese oxide (MnO ₂ ), cobalt oxide (CoO), and iron oxide (Fe ₂ O ₃ ). A polarizing film production method comprising a light diffusion layer to be. delete delete delete The method of claim 1, The organic solvent is alcohol methanol, isopropanol, butanol, t-butanol, isobutanol, acetone, methyl ethyl ketone, methyl isobutyl ketone, acetyl acetone, ethyl acetate, butyl acetate, ethyl cellosolve, methyl cellosolve, butyl At least one of cellosolve, 1-methoxy-2-propanol, N-methyl pyrrolidone, ethylcellosolve acetate, diacetone alcohol, benzene, toluene, xylene, ethylbenzene Polarizing film manufacturing method comprising a light diffusion layer.

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