KR20160049943A - Method for manufacturing polarizer, polarizer manufactured by the same and polarizing plate comprising the same - Google Patents

Abstract

The present specification relates to a manufacturing method of a polarizer, a polarizer manufactured by the same method, and a polarizing plate comprising the same. More specifically, the present invention relates to the manufacturing method of a polarizer with improved smoothness, the polarizer manufactured by the same method, and the polarizing plate comprising the same. According to the present invention, the method comprises: a step of dyeing a dye; a step of cross-linking a polyvinyl alcohol film and the dye; a step of starching the polyvinyl alcohol film; a step of cleaning and drying the polyvinyl alcohol film; and a step of planarizing the polyvinyl alcohol film.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarizer, a method of manufacturing the polarizer, a polarizer manufactured using the polarizer, and a polarizer including the same. BACKGROUND ART [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a polarizer, a polarizer manufactured using the polarizer, and a polarizing plate including the polarizer.

The polarizing plate is applied to various display devices such as a liquid crystal display device, an organic electroluminescence device, and the like. Currently used polarizing plates are used in the form of functional layers such as protective films and hard coating layers by applying an adhesive to polyvinyl alcohol (PVA) polarizers.

The occurrence of defects in the step of applying an adhesive or the like and / or the step of laminating the functional layers in the polarizer manufacturing process is often caused by the smoothness of the polarizer. In addition, the occurrence of defects in the coating and / or lamination step may cause degradation of the performance of the polarizing plate as a final product.

Therefore, research for improving the smoothness of the polarizer is needed.

Japanese Laid-Open Publication No. 2003-121644

The present invention provides a method for producing a polarizer, a polarizer manufactured using the polarizer, and a polarizer including the polarizer. More specifically, it is an object of the present invention to provide a polarizer having improved smoothness, a polarizer manufactured using the polarizer, and a polarizing plate including the polarizer.

One embodiment of the present disclosure

Dyes at least one dye of iodine and dichroic dye onto an unstretched polyvinyl alcohol-based film;

Crosslinking the polyvinyl alcohol-based film with the dye;

Stretching the polyvinyl alcohol-based film;

Washing and drying the polyvinyl alcohol-based film; And

And planarizing the polyvinyl alcohol-based film using a heating roll after the cleaning and drying step,

And the temperature of the heating roll is 40 ° C to 80 ° C.

An embodiment of the present disclosure also provides a polarizer manufactured according to the above-described manufacturing method.

In addition, one embodiment of the present invention provides a polarizing plate comprising the polarizer.

In addition, one embodiment of the present specification relates to a display panel, And the polarizing plate attached to one surface or both surfaces of the display panel.

A polarizer manufacturing method according to one embodiment of the present disclosure provides a polarizer with improved smoothness.

In addition, the polarizer manufactured by the polarizer manufacturing method according to one embodiment of the present invention has an advantage that the optical characteristics of the entire polarizer including the polarizer are uniformized due to the improvement in smoothness.

The polarizer according to one embodiment of the present disclosure can reduce the incidence of defects due to nonuniform lamination on new layer stacking on at least one side of the polarizer.

1 is a flowchart illustrating a method of manufacturing a polarizer according to an embodiment of the present invention.
2 is a view for explaining a planarization step in a polarizer manufacturing method according to an embodiment of the present invention.
FIGS. 3 and 4 illustrate the stacking order of the respective components of the polarizing plate according to one embodiment of the present disclosure.

Hereinafter, the present specification will be described in more detail.

In the case of conventional polarizers, thickness deviation and smoothness in the width direction are often not good due to various factors such as drying speed, initial roll thickness deviation, and stretching uniformity. In the case of a polarizer having poor smoothness, bubbles and adhesive bridges may be generated due to non-uniform application of the adhesive in a process of laminating using a protective film and an adhesive, which may cause a problem that the optical properties of the polarizer are not uniform . Accordingly, the present invention provides a method of manufacturing a polarizer capable of improving the smoothness of a polarizer and a polarizer improved in smoothness.

One embodiment of the present invention relates to a process for dyeing at least one of iodine and dichroic dye (hereinafter referred to as " dyeing step ") to an unstretched polyvinyl alcohol-based film; Crosslinking the polyvinyl alcohol-based film with the dye (hereinafter referred to as " crosslinking step "); Stretching the polyvinyl alcohol-based film (hereinafter referred to as a " stretching step "); Washing and drying the polyvinyl alcohol-based film (hereinafter referred to as " cleaning and stretching step "); And a step of planarizing the polyvinyl alcohol-based film using a heating roll after the cleaning and drying step (hereinafter referred to as a 'planarizing step'), wherein the temperature of the heating roll is 40 ° C to 80 ° C ≪ / RTI >

When the temperature of the heating roll is 40 ° C or higher, the effect of improving smoothness is sufficiently exhibited. When the temperature of the heating roll is 80 ° C or lower, there is an advantage that an effective smoothness improving effect is obtained without decreasing the degree of polarization. On the other hand, when the temperature of the heating roll exceeds 80 캜, the glass transition temperature (Tg) of the polyvinyl alcohol (PVA) -based polarizing element may be exceeded, and the polarizing element may be shrunk or deformed.

FIG. 1 schematically shows the procedure of the polarizer manufacturing method. Referring to FIG. 1, the manufacturing method according to one embodiment of the present disclosure can be performed in the order of a sequencing step, a crosslinking step, a stretching step, a cleaning and drying step, and a planarizing step. However, the order is not necessarily limited to the above-described order other than the flattening step.

The polarizer manufacturing method according to one embodiment of the present disclosure includes a planarization step to improve the smoothness of the polarizer. Specifically, the method includes a planarizing step of planarizing the polyvinyl alcohol-based film using a heating roll after the cleaning and drying step. In the case of applying a heating roll to the polyvinyl alcohol film before the washing and drying step, more specifically, before the drying step, the polyvinyl alcohol orientation may be influenced and the polarization degree may be lowered. There is a drawback.

According to one embodiment of the present invention, the planarizing step further comprises a step of pressing the polyvinyl alcohol-based film on the opposite side of the surface contacting with the heating roll, using a nipping roll.

According to one embodiment of the present disclosure, the pressure applied by the nipping roll is 200 Kgf to 500 Kgf. Specifically, according to one embodiment of the present invention, the planarizing step further comprises a step of pressing the polyvinyl alcohol-based film by using a nipping roll on a side opposite to a side in contact with the heating roll, The pressure applied by the roll is 200 Kgf to 500 Kgf.

The pressure applied by the nipping roll can be measured by checking the pressure gauge in the equipment during the manufacturing process.

The nipping roll acts to apply pressure. Specifically, the pressure is applied to the polyvinyl alcohol film to increase the adhesion between the heating roll and the polyvinyl alcohol film, thereby allowing the planarization step to proceed more efficiently. When the pressure applied by the nipping roll is within the above numerical range, the above-mentioned effect is efficiently exhibited. FIG. 2 shows a case where both the heating roll and the nipping roll are applied in the flattening step.

According to an embodiment of the present disclosure, the polarizer manufacturing method may further include removing water contained in the polarizer, and the step of pressing using the nipping roll may include removing the water Process) and then after the drying process. At this time, the step of removing the water may use a nipping roll, but the purpose and effect of using the nipping roll in the planarizing step are different from those of using the nipping roll.

According to one embodiment of the present disclosure, the temperature of the heating roll may be between 60 캜 and 80 캜. The smoothness improvement effect of the polarizer was changed according to the temperature of the heating roll. When the temperature of the heating roll satisfied the above range, the smoothness of the polarizer was more effectively corrected.

Hereinafter, each step of the polarizer manufacturing method of the present specification will be described in more detail.

The iodine molecule and / or the dichroic dye molecule absorbs light oscillating in the stretching direction of the polarizer, and the iodine molecule and / or the dichroic dye molecule absorbs light in the vertical direction It is possible to obtain polarized light having a specific vibration direction. At this time, the dyeing can be performed, for example, by impregnating a polyvinyl alcohol-based film into a treatment bath containing a solution containing an iodine solution and / or a dichroic dye.

At this time, water is generally used as a solvent for the solution in the step of saponification, but an appropriate amount of an organic solvent having compatibility with water may be added. On the other hand, the iodine and / or dichroic dye may be used in an amount of 0.06 part by weight to 0.25 part by weight based on 100 parts by weight of the solvent. When the dichroic substance such as iodine is within the above range, the transmittance of the polarizer produced after stretching may satisfy the range of 40.0% to 47.0%.

On the other hand, when iodine is used as the dichroic substance, it is preferable to add an auxiliary agent such as iodide compound for improving the efficiency of the dyeing. The auxiliary agent is added in an amount of 0.3 to 2.5 parts by weight per 100 parts by weight of the solvent Can be used. At this time, the additive such as the iodide compound is added in order to increase the solubility of iodine in water because the solubility of iodine in water is low. On the other hand, the compounding ratio of iodine to iodide is preferably 1: 5 to 1:10 by weight.

Specific examples of the iodide compound that may be added include potassium iodide, lithium iodide, zinc iodide, aluminum iodide, lead iodide, copper iodide, barium iodide, calcium iodide, tin iodide, titanium iodide, , But is not limited thereto.

On the other hand, the temperature of the treatment bath is preferably maintained at about 25 캜 to 40 캜. If the temperature of the treatment bath is lower than 25 ° C, the efficiency of the dyeing may be lowered. If the temperature is higher than 40 ° C, iodine sublimation may occur to increase the amount of iodine.

The time for immersing the polyvinyl alcohol film in the treatment bath is preferably about 30 to 120 seconds. If the immersion time is less than 30 seconds, the polyvinyl alcohol film may not be uniformly dyed. If the immersion time is longer than 120 seconds, the dyeing is saturated and it is not necessary to further immerse the film.

On the other hand, the crosslinking step is a step for allowing the iodine and / or dichroic dye to be adsorbed to the polyvinyl alcohol polymer matrix, and a deposition method in which the polyvinyl alcohol film is immersed in a crosslinking bath containing an aqueous solution of boric acid or the like is generally used However, it is not limited to this, and may be carried out by a coating method or a spraying method in which a solution containing a crosslinking agent is applied or sprayed onto a polyvinyl alcohol-based film.

At this time, although water is generally used as a solvent used in the solution of the crosslinking bath, an appropriate amount of an organic solvent having compatibility with water may be added, and the crosslinking agent may be added in an amount of 0.5 to 5.0 wt. . When the crosslinking agent is contained in an amount of less than 0.5 part by weight, the crosslinking in the polyvinyl alcohol film may be insufficient and the strength of the polyvinyl alcohol film may be lowered in water. When the crosslinking agent is more than 5.0 parts by weight, And the stretching property of the polyvinyl alcohol-based film can be lowered. Specific examples of the crosslinking agent include boron compounds such as boric acid and borax, glyoxal, and glutaraldehyde, which may be used alone or in combination. However, the present invention is not limited thereto.

On the other hand, the temperature of the crosslinking bath varies depending on the amount of the crosslinking agent and the stretching ratio, but is not limited thereto, but it is generally preferably 45 ° C to 60 ° C. In general, when the amount of the crosslinking agent is increased, the temperature of the crosslinking bath is controlled at a high temperature condition in order to improve the mobility of the polyvinyl alcohol film chain. When the amount of the crosslinking agent is small, Adjust the temperature. However, since the polarizing plate manufacturing method according to one embodiment of the present invention is a process of stretching 5 times or more, the temperature of the crosslinking bath should be maintained at 45 ° C or more in order to improve the stretchability of the polyvinyl alcohol film. On the other hand, the time for immersing the polyvinyl alcohol film in the crosslinking bath is preferably about 30 to 120 seconds. If the immersion time is less than 30 seconds, the crosslinking may not be uniformly performed on the polyvinyl alcohol film. If the immersion time is longer than 120 seconds, the crosslinking is saturated and there is no need to further immerse.

On the other hand, the stretching in the stretching step is for orienting the polymer chain of the polyvinyl alcohol-based film in a certain direction. The stretching method can be classified into a wet stretching method and a dry stretching method. The dry stretching method is also called inter- A heating roll stretching method, a compression stretching method, a tenter stretching method and the like. The wet stretching method is classified into a tenter stretching method and a roll-to-roll stretching method.

In the present specification, the stretching method is not particularly limited, but in the case of the dry stretching method, it is preferable to use a tenter stretching method, and it is more preferable to perform the wet stretching method. When performed by the wet stretching method, the smoothing degree improvement effect of the polarizer by the planarizing step appears more efficiently.

According to one embodiment of the present invention, the stretching step may be performed by a wet stretching method. The problem that the thickness deviation in the width direction and the smoothness of the polarizer are not good due to various causes such as the above-mentioned drying speed is more frequently seen in the polarizer after wet stretching.

At this time, it is preferable that the stretching step stretches the polyvinyl alcohol film at a stretching ratio of 4 to 10 times. In order to impart a polarization performance to the polyvinyl alcohol film, the polymer chain of the polyvinyl alcohol-based film must be oriented. In the stretching ratio of less than 4 times, the chain may not be aligned sufficiently. This is because the vinyl alcohol-based film chain can be cut.

At this time, the stretching is preferably performed at a stretching temperature of 45 ° C to 60 ° C. The stretching temperature may vary depending on the content of the crosslinking agent. When the temperature is lower than 45 ° C, the flowability of the polyvinyl alcohol-based film chain is lowered and the stretching efficiency may be decreased. When the stretching temperature is higher than 60 ° C, Is softened and the strength can be weakened. Meanwhile, the stretching step may be carried out simultaneously with or separately from the step of solidifying or crosslinking.

On the other hand, the stretching may be performed by a polyvinyl alcohol film alone, or may be performed by laminating a base film on a polyvinyl alcohol film, followed by stretching the polyvinyl alcohol film and the base film together. When the latter polyvinyl alcohol film (for example, a PVA film having a thickness of 60 탆 or less) is stretched, it is used to prevent the polyvinyl alcohol film from breaking in the stretching process. Can be used to produce thin PVA polarizers.

The base film may be a polymer film having a maximum draw ratio of 5 times or more at a temperature of 20 ° C to 85 ° C. For example, a high density polyethylene film, a polyurethane film, a polypropylene film, a polyolefin film, Based film, a low-density polyethylene film, a high-density polyethylene and a low-density polyethylene coextruded film, a copolymer resin film containing ethylene vinyl acetate in high-density polyethylene, an acrylic film, a polyethylene terephthalate film, a polyvinyl alcohol film and a cellulose film . On the other hand, the maximum drawing magnification means a drawing magnification immediately before a break occurs.

The method of laminating the base film and the polyvinyl alcohol film is not particularly limited. For example, the base film and the polyvinyl alcohol-based film may be laminated via an adhesive or a pressure-sensitive adhesive, or may be laminated in such a manner that a polyvinyl alcohol film is placed on a base film without any other medium. In addition, the resin forming the base film and the resin forming the polyvinyl alcohol film may be pneumatically delivered, or may be carried out by coating a polyvinyl alcohol resin on the base film.

On the other hand, the base film may be removed from the polarizer after the stretching is completed, but the base film may proceed to the next step without being removed. In this case, the base film can be used as a polarizer protective film or the like to be described later.

Next, the polyvinyl alcohol film is washed and dried.

The cleaning and drying step is performed to clean the crosslinking solution remaining in the polarizer and to correct the external strain caused by residual boric acid and iodine of the polarizer and can be carried out by a cleaning and drying method of a polarizer known in the art For example, the cleaning and drying step may be performed in such a manner that the polarizer is passed through the cleaning roll and the heating roll.

Next, the planarization step is performed. The description of the leveling step is applied as it is.

According to an embodiment of the present invention, it is possible to further include the step of providing an optical layer on at least one side of the polyvinyl alcohol-based film after the planarizing step. At this time, the optical layer may be a polymer film such as a protective film or a retardation film, or may be a functional film layer such as a brightness enhancement film, or a functional layer such as a hard coating layer, an antireflection layer and an adhesive layer.

The optical layer may be a post-cured type layer.

According to one embodiment of the present invention, the optical layer may be a protective film, a retardation film, a brightness enhancement film, a hard coating layer, an antireflection layer, an adhesive layer, an adhesive layer, or a combination thereof.

The adhesive layer includes an adhesive, and may be specifically a thermosetting adhesive and / or an ultraviolet curable adhesive, but is not limited thereto.

In the case of a hard coating layer or an ultraviolet (UV) curing type adhesive, the frequency of polarizer appearance defects is high and the polarizer manufacturing method according to one embodiment of the present invention can be efficiently applied.

According to another embodiment, the polarizer manufacturing method may be a thin polarizer manufacturing method, specifically, a polarizer manufacturing method with a thickness of 10 탆 or less.

An embodiment of the present disclosure also provides a polarizer manufactured according to the polarizer manufacturing method according to one of the above-described embodiments.

According to one embodiment of the present disclosure, the polarizer may be a thin polarizer, specifically, a polarizer having a thickness of 10 mu m or less.

In addition, one embodiment of the present invention provides a polarizing plate comprising the polarizer.

The polarizing plate is excellent in the degree of polarization and high in uniformity of transmittance and degree of polarization. In the case of group transmittance, the deviation can be within ± 0.5% at ± 1% of the original deviation, and the deviation can be reduced from ± 0.01% to ± 0.005%.

The polarizer may have components and stacking sequence known in the art, except for including a polarizer manufactured according to the method of making the polarizer according to one embodiment of the present disclosure.

For example, as shown in FIG. 3, a protective film 102 may be laminated on one side of the polyvinyl alcohol polarizer 100 through an adhesive layer or an adhesive layer 101. [ 4, a protective film 102 may be laminated on one side of a polyvinyl alcohol polarizer 100 through an adhesive layer or an adhesive layer 101, and a protective film of a polarizer may be laminated And the hard coating layer 103 may be provided on the other surface. However, the constituent elements of the polarizer according to one embodiment of the present specification and the order of lamination are not limited to those shown in FIGS. 3 and 4. FIG.

An embodiment of the present disclosure also includes a display panel; And a polarizing plate attached to one surface or both surfaces of the display panel according to the above-described embodiment.

The display panel may be a liquid crystal panel, a plasma panel, and an organic light emitting panel. Accordingly, the image display device may be a liquid crystal display (LCD), a plasma display device (PDP), and an organic light emitting display .

More specifically, the image display device may be a liquid crystal display device including a liquid crystal panel and polarizing plates respectively provided on both surfaces of the liquid crystal panel, wherein at least one of the polarizing plates is a liquid crystal display device according to an embodiment of the present invention And may be a polarizing plate including a polarizer.

At this time, the type of the liquid crystal panel included in the liquid crystal display device is not particularly limited. A passive matrix type panel such as a twisted nematic (TN) type, a super twisted nematic (STN) type, a ferroelectic (F) type or a polymer dispersed (PD) type; An active matrix type panel such as a two terminal or a three terminal; A known panel such as an in-plane switching (IPS) panel and a vertical alignment (VA) panel may be used. Further, the other constituent elements constituting the liquid crystal display device, for example, the types of the upper and lower substrates (for example, a color filter substrate or an array substrate) are not particularly limited and the structures known in this field are not limited Can be employed.

Hereinafter, the present invention will be described in more detail by way of examples. However, the following embodiments are intended to illustrate the present disclosure, and thus the scope of the present specification is not limited thereto.

≪ Example 1 >

After swelling 60 占 퐉 of a polyvinyl alcohol (PVA) film (M6000 manufactured by Japan Synthetic Company) in a room temperature water bath for 30 seconds, the aqueous solution containing 4% by weight of a dichroic dye (iodine: potassium iodide = 1:10) The polyvinyl alcohol film thus obtained was immersed and subjected to a dying treatment. Then, the film was subjected to wet stretching at a stretching magnification of 5 times in the machine direction (MD) by free end stretching in an aqueous solution containing 60% of boric acid at a temperature of 60 캜. Thereafter, the film was dipped in an aqueous solution containing 5% by weight of potassium iodide to perform complementary treatment.

Next, the stretched film was dried in an oven at 80 DEG C for 60 seconds to prepare a polarizer. The prepared polarizer was passed through a 40 ° C heating roll to improve the smoothness. Thereafter, an ultraviolet curable adhesive was applied to the prepared polarizer and triacetylcellulose (TAC) film, followed by laminating, followed by ultraviolet curing to prepare a polarizing plate sample.

≪ Example 2 >

The stretching and drying were carried out in the same manner as in Example 1, except that the step of applying a nipping roll having a pressure of 300 Kgf by a nipping roll was carried out.

≪ Example 3 >

The stretching and drying were carried out in the same manner as in Example 1, except that the temperature of the heating roll was changed to 80 캜 and the pressure applied by the nip roll was 300 Kgf.

<Example 4>

The procedure of Example 1 was repeated except that the temperature of the heating roll after stretching and drying was set to 80 캜, and a nipping roll having a pressure of 400 Kgf applied by a nipping roll was applied.

&Lt; Example 5 >

Polyvinyl alcohol film (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., NH-26, Tg = 80 占 폚) was dissolved in water to prepare a polyvinyl alcohol aqueous solution. The polyvinyl alcohol aqueous solution was coated on a polyethylene terephthalate film (Mitsubishi Suzuki SG-007, Tg = 80 캜, 150 탆) and dried to obtain a polarizer having a polyvinyl alcohol coating film having a thickness of 10 탆 .

The polarizer was dry-drawn at a stretching magnification of 5 times in the longitudinal direction (MD) by uniaxial free-end drawing at a temperature of 100 ° C. The thickness of the polyvinyl alcohol film after stretching was 5 占 퐉.

And the stretched film was immersed in an aqueous solution containing 4% by weight of a dichroic dye (iodine: potassium iodide = 1: 10). Thereafter, the film was immersed in an aqueous solution containing 1% by weight of boric acid and crosslinked. Thereafter, the film was dipped in an aqueous solution containing 5% by weight of potassium iodide to perform complementary treatment.

Next, the film was dried in an oven at 80 DEG C for 60 seconds to prepare a polarizer. The polarizing element was passed through a nip roll having a pressure of 400 kgf applied by a heating roll at 80 ° C and a nip roll to produce a final polarizer. The prepared polarizer and triacetylcellulose (TAC) film were laminated using a UV-curable adhesive, and cured by irradiating ultraviolet rays. After curing, the TAC film and the PVA film were peeled off to produce a final polarizing plate.

&Lt; Comparative Example 1 &

Except that the temperature of the heating roll after stretching and drying was changed to 25 占 폚.

&Lt; Comparative Example 2 &

The procedure of Example 1 was repeated except that the temperature of the heating roll was changed to 40 캜 and the pressure applied by the nip roll was 300 Kgf before the drying step.

Examples 1 to 5 and Comparative Examples 1 to 2 are collectively shown in Table 1 below.

When the planarization step is performed Heating roll
Temperature
(° C) The pressure exerted by the nipping roll Thickness deviation asperity
(Ra) Number of line defective Polarizer thickness Ts
(%) PE
(%) Comparative Example 1 After Polarizer Drying 25
0 1 탆 353 nm 4 22 탆 42.6 99.9 Comparative Example 2 Before polarizer drying 40 300Kgf 1 탆 470 nm 5 22 탆 43.1 99.5 Example 1 After Polarizer Drying 40 0 0.6 탆 403 nm 4 22 탆 42.6 99.9 Example 2 After Polarizer Drying 40 300Kgf 0.6 탆 83nm 2 22 탆 42.6 99.9 Example 3 After Polarizer Drying 80 300Kgf 0.5 탆 53nm 0 22 탆 42.5 99.9 Example 4 After Polarizer Drying 80 400Kgf 0.5 탆 45nm 0 15 탆 42.2 99.9 Example 5 After Polarizer Drying 80 400Kgf 0.4 탆 43 nm 0 5 탆 42.5 99.9

As can be seen from Table 1, the polarizer manufactured by the manufacturing method according to one embodiment of the present invention has an improved smoothness and a low defect rate. Specifically, when the temperature of the heating roll and / or the pressure of the nipping roll satisfy the numerical value range according to one embodiment of the present invention, the comparison of Comparative Example 1 with Examples 1 to 5 shows that the smoothness improving effect is excellent Comparing Comparative Example 2 with Examples 1 to 5, it can be seen that the smoothness improving effect is effectively exhibited by performing the planarization step after the cleaning and drying steps.

In comparison between Example 1 and Examples 2 to 5, it is understood that the effect of improving smoothness is maximized when the heating roll and the nipping roll are simultaneously applied.

On the other hand, as shown in Example 5, the polarizer manufactured by the manufacturing method according to one embodiment of the present disclosure can be a thin polarizer. Specifically, the polarizer included in the polarizing plate produced according to Embodiment 5 has a thickness of about 5 탆.

100: Polarizer
101: adhesive layer or adhesive layer
102: protective film
103: Hard coating layer

Claims (9)

Dyes at least one dye of iodine and dichroic dye onto an unstretched polyvinyl alcohol-based film;
Crosslinking the polyvinyl alcohol-based film with the dye;
Stretching the polyvinyl alcohol-based film;
Washing and drying the polyvinyl alcohol-based film; And
And planarizing the polyvinyl alcohol-based film using a heating roll after the cleaning and drying step,
Wherein the temperature of the heating roll is 40 占 폚 to 80 占 폚. The method of claim 1, wherein the planarizing step further comprises the step of pressing a polyvinyl alcohol-based film using a nipping roll on the opposite side of the side contacting the heating roll. The polarizer manufacturing method according to claim 2, wherein the pressure applied by the nip roll by the nip roll is 200 Kgf to 500 Kgf. The method according to claim 1, wherein the stretching step is performed by a wet stretching method. The method of claim 1, further comprising the step of providing an optical layer on at least one side of the polyvinyl alcohol-based film after the planarizing step. The polarizer manufacturing method according to claim 5, wherein the optical layer is a protective film, a retardation film, a brightness enhancement film, a hard coating layer, an antireflection layer, a pressure sensitive adhesive layer, an adhesive layer or a combination thereof. A polarizer produced according to any one of claims 1 to 6. A polarizer comprising a polarizer according to claim 7. Display panel; And
And the polarizing plate according to claim 8 attached to one or both surfaces of the display panel.

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