WO2015046765A1 - Method for manufacturing one-sided thin polarizing plate - Google Patents

Abstract

The present invention relates to a method for manufacturing a one-sided thin polarizing plate, the method comprising the steps of: supplying a process film to one side of a polarizer having a thickness of 50μm or less; supplying a protection film to the other side of the polarizer; forming an adhesive layer by supplying an adhesive composition between the polarizer and the protection film; arranging a pair of pressing means on each surface of the process film and the protection film, and pressing a laminate of the process film/the polarizer/the protection film; and peeling off the process film, wherein peeling strength between the polarizer and the process film is 1.0N or less.

Description

Method of manufacturing single-sided thin polarizing plate

The present invention relates to a method for producing a single-sided thin polarizing plate.

Polarizers are optical elements for making natural light or arbitrary polarization into polarized light in a specific direction, and are widely used in display devices such as liquid crystal display devices and organic light emitting devices (OLEDs). Currently, the polarizing plate used in the display device has been used as a structure in which a protective film is laminated on both sides of a polarizer made of a polyvinyl alcohol (hereinafter referred to as 'PVA') resin, which is usually dyed with a dichroic dye or iodine. .

However, according to the recent trend of thinning of display devices, the polarizer also needs to have a thinner thickness. Accordingly, a technique of manufacturing a single-sided polarizing plate which attaches a protective film only to one surface of the polarizer, or a technique of forming a thin film of polyvinyl alcohol (hereinafter referred to as PVA) as a polarizer thinly to 50 μm or less It is proposed.

However, the manufacturing method of the conventional single-sided polarizing plate manufactured by the method of supplying a protective film to one side of PVA, apply | coating an adhesive composition in between, and pressurizing using a pressure roll, had difficulty in manufacturing. Because, in the process of applying the adhesive composition, when the width to which the adhesive composition is applied is narrower than the width of the polarizer, a non-adhesive surface is generated on the polarizer, the PVA-based film having such an unbonded surface is peeled off during the post-processing process have. Therefore, in order to prevent this, when the adhesive composition is applied wider than the width of the polarizer, a problem such that the adhesive applied to the wider than the polarizer contaminates the pressure roll in the pressing process occurs.

On the other hand, it is most preferable to manufacture a single-sided polarizing plate using a thin PVA film from a thinning viewpoint. However, when the conventional single-sided polarizing plate manufacturing method is applied to a thin PVA film having a low stiffness in the TD direction due to stretching, as it is, the breakage occurs easily due to the modulus difference applied to both sides of the PVA film. There is a problem.

Therefore, a thin polarizer having a thickness of 50 μm or less may be used in the process of manufacturing the single-sided polarizing plate, and even if the width of the adhesive composition is slightly wider than the width of the polarizer, contamination may be easily and simply prevented from occurring in the manufacturing process. Development of technology is required.

The present invention is to solve the above problems, using a thin polarizer with a thickness of 50㎛ or less, the thickness is remarkably thin, can easily prevent the occurrence of contamination in the manufacturing process, excellent workability, economical and An object of the present invention is to provide a method for manufacturing a highly productive one-sided thin polarizing plate.

In one aspect, the present invention, the step of supplying a process film to one surface of the polarizer having a thickness of 50㎛ or less; Supplying a protective film to the other surface of the polarizer; Supplying an adhesive composition between the polarizer and the protective film to form an adhesive layer; Arranging a pair of pressing means on each surface of the process film and the protective film to press the laminate of the process film / polarizer / protective film; And peeling the process film, and a peeling force between the polarizer and the process film is 1.0 N or less.

In addition, the method of manufacturing a single-sided thin polarizing plate of the present invention may further include forming a protective layer on a surface from which the process film is peeled off after the process film is peeled off.

On the other hand, in the method for producing a single-sided thin polarizing plate of the present invention, the adhesive composition may be formed using a radical curable composition or a cation curable composition.

In addition, in the method of manufacturing a single-sided thin polarizing plate of the present invention, the protective layer may be formed using a radical curable composition or a cation curable composition.

In this case, the modulus of the protective layer may be 500MPa to 6000MPa, the thickness may be 0.5㎛ to 10㎛.

On the other hand, the thickness of the process film may be 20㎛ to 100㎛, the width of the process film may be larger than the width of the polarizer. In addition, the surface roughness (Ra) of the process film may be 0.5nm to 60nm.

Meanwhile, the polarizer preferably has a thickness of 50 μm or less after stretching, and the stretching may be wet stretching or dry stretching, and the stretching ratio may be 4 times or more.

In addition, the thickness of the single-sided thin polarizing plate manufactured according to the present invention may be 30㎛ to 140㎛.

According to the manufacturing method of the present invention, a thin polarizer having a significantly thin thickness can be manufactured by using a thin polarizer having a thickness of 50 μm or less, and it is possible to easily prevent contamination from occurring in the manufacturing process, thereby providing excellent workability in the process. There is an advantage.

In addition, when using the manufacturing method of the single-sided thin polarizing plate according to the present invention, since it can be performed in a continuous process using a roll to roll (roll to roll) process, the production yield is high, very economical.

1 schematically shows one embodiment of a method of manufacturing a single-sided thin polarizing plate according to the present invention.

2 schematically shows another embodiment of the method for manufacturing a single-sided thin polarizing plate according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. In addition, the embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. Shape and size of the elements in the drawings may be exaggerated for more clear description.

The inventors of the present invention have been studied to reduce the breakage rate of the polarizer, and to develop a method for manufacturing a single-sided thin polarizer that prevents contamination of the roll in the pressing process, the result of the polarizer surface without a protective film The present invention was completed by finding out that the above object can be achieved by supplying a process film to the upper part and then performing a pressurization process.

More specifically, the manufacturing method of the single-sided thin polarizing plate according to the present invention comprises the steps of: supplying a process film to one surface of a polarizer having a thickness of 50 μm or less; Supplying a protective film to the other surface of the polarizer; Supplying an adhesive composition between the polarizer and the protective film to form an adhesive layer; Arranging a pair of pressing means on each surface of the process film and the protective film to press the laminate of the process film / polarizer / protective film; And peeling the process film, wherein the peel force between the polarizer and the process film is 1.0 N or less.

That is, the manufacturing method of the single-sided thin polarizer according to the present invention may include a film supply process, a pressing process and a peeling process. Hereinafter, an embodiment of a method for manufacturing a single-sided thin polarizing plate according to the present invention will be described with reference to FIG. 1. 1 is a schematic cross-sectional view showing a method for manufacturing a single-sided thin polarizing plate according to the present invention.

In the method for manufacturing a single-sided thin polarizer according to the present invention, the film supplying process includes supplying a process film to one surface of the polarizer having a thickness of 50 μm or less and supplying a protective film to the other surface of the polarizer. do. More specifically, for example, as shown in FIG. 1, the process film 200 is supplied to one surface of the polarizer 100 made of a polyvinyl alcohol-based resin film having a thickness of 50 μm or less, and at the same time, It may be performed by a method of supplying the protective film 300.

Here, the method of supplying the polarizer 100, the process film 200, and the protective film 300 may be performed using a method well known in the art. For example, as shown in FIG. 1, the polarizer 100, the process film 200, and the protective film 300 may be supplied in a form in which each film is wound on the rolls 110, 210, and 310. However, the present invention is not limited thereto.

In particular, in the method for manufacturing a single-sided thin polarizing plate according to the present invention, when the process film 200 is used as described above, the process film 200 absorbs the pressure applied by the pressing means and acts on the polarizer. There is an advantage that the stress can be reduced to effectively reduce the breakage.

In addition, as described above, since the pressing means is located directly on the upper surface of the polarizer, there is a problem that the adhesive contaminates the pressing means, that is, the roll in the pressing process. However, in the manufacturing method of the thin polarizing plate according to the present invention, since the process film 200 exists on the upper part of the polarizer, the contamination of the pressing means due to the adhesive used when the protective film 300 is adhered to the polarizer 100 is relative. It has the advantage of being less.

On the other hand, the feed rate of each of the films may be determined and supplied at an appropriate value for the manufacturing process, and is not particularly limited. Do.

In addition, the supply direction of the polarizer 100, the process film 200, and the protective film 300 may be supplied in an oblique direction as shown in FIG. 1, but is not limited thereto. Therefore, there may be a portion that is supplied vertically or in parallel.

Here, the polarizer 100 may use a thickness of 50㎛ or less, the thickness of the polarizer means the thickness after stretching. That is, in the present invention, the polarizer preferably has a thickness of 50 µm or less after stretching, more preferably 4 µm to 30 µm or 4 µm to 25 µm. This is because, when the thickness of the polarizer after stretching satisfies the numerical range, the thinner single-sided thin polarizing plate can be easily manufactured.

On the other hand, as the polarizer 100, a polyvinyl alcohol-based resin film in which molecular chains containing an iodine compound or a dichroic dye is oriented in a predetermined direction is generally used. The polarizer 100 may be prepared by dyeing an iodine or a dichroic dye in a polyvinyl alcohol-based resin film, and then stretching and crosslinking in a predetermined direction. In this case, the stretching process may be performed by wet stretching performed on a solution such as aqueous boric acid solution or iodine solution, or dry stretching performed in the air, and the stretching ratio is 4 times or more, more specifically 4 to 15 times or 4 times. It is preferable that it is 10 times to 13 times, and the stretching direction is preferably performed in the longitudinal direction (Machine Direction, MD direction) of the polyvinyl alcohol-based resin film. In addition, the degree of polymerization of the polyvinyl alcohol is not particularly limited, but considering the freedom of molecular movement and flexible mixing with the containing material, the polymerization degree is preferably about 1,000 to 10,000, more preferably about 1,500 to 5,000. good. In the present invention, the polarizer 100 may use a commercially available product, for example, products such as Kuraray Co. or Japan Synthetic Co. may be used.

In addition, the film which can be used as the said process film 200 in this invention will not be specifically limited if the peeling force between the polarizer 100 and the process film 200 is 1.0N or less. Usually, since the adhesive force between the polarizer and the substrate is at a level of about 1.01N to 4N, when the peeling force between the polarizer and the process film exceeds 1.0N, the process film does not peel well or damages the polarizer in the peeling process described later. There is a problem that can be done.

In this specification, the peel force between a polarizer and a process film means the value measured by the method of peeling 90 degrees at 300 m / min speed using the single-sided polarizing plate of width 20mm and length 100mm. In this case, the surface to be peeled off may be an interface between the process film and the PVA-based film or an interface between the process film and the adhesive layer.

Meanwhile, specific examples of the process film 200 may include at least one selected from the group consisting of polyethylene terephthalate film, polyethylene film, polycarbonate film, triacetylcellulose film, cycloolefin polymer film, and acrylic film. It is not limited. In this case, in the case of using a substrate having a high adhesive strength with a PVA-based film such as an acrylic film as the process film 200, a separate surface in order to satisfy the peel force condition between the polarizer 100 and the process film 200. Processing can be performed.

The surface treatment may be performed by a method well known in the art, for example, may be performed by a method such as silicone coating.

On the other hand, the thickness of the process film 200 is not particularly limited, but, for example, having a thickness of 20 μm to 100 μm or 25 μm to 75 μm is preferable in terms of running stability. When the thickness of the process film satisfies the above numerical range, the film may expand and / or shrink due to heat generated during ultraviolet curing to prevent wrinkles, and ultraviolet rays may well reach the adhesive layer during ultraviolet curing. There is an advantage that can solve the problem of the uncured portion.

Furthermore, in the present invention, the width of the process film 200 is preferably larger than the width of the polarizer 100. When the width of the process film 200 is greater than the width of the polarizer 100, contamination of the pressing means due to the adhesive may be more effectively reduced.

In addition, it is preferable that the surface roughness Ra of the process film 200 is, for example, 0.5 nm to 60 nm, 1 nm to 55 nm, or 2 nm to 50 nm.

Here, the surface roughness means a fine concavo-convex shape formed on the surface of the process film. In the present invention, since the process film has a fine surface irregularities of the same size on the entire surface thereof, the surface area is significantly increased so that adhesion with the polarizer is effectively performed without forming a separate adhesive layer or the like. . In particular, in the present invention, when using a process film having a surface roughness value in the range as described above is very advantageous because it can prevent the occurrence of the orange peel (roughness peel) is generated by the irregularities on the surface of the polarizer.

On the other hand, in the method for manufacturing a single-sided thin polarizing plate according to the present invention, the protective film 300 is not particularly limited as long as it is a transparent base film. More specifically, for example, it may include one or more selected from the group consisting of polyethylene terephthalate film, polyethylene film, polycarbonate film, triacetylcellulose film, cycloolefin polymer film and acrylic film, but is not limited thereto. no.

Next, the film supply process includes supplying an adhesive composition between the polarizer 100 and the protective film 300 to form an adhesive layer.

Here, the step of forming the adhesive layer may be performed by a method of applying the adhesive composition to at least one of the bonding surface of the polarizer 100 and the bonding surface of the protective film 300 in any step of the film supply process. Can be. In FIG. 1, although the adhesive composition is apply | coated to the bonding surface of the protective film 300 using the adhesive agent application apparatus 50, the surface which apply | coats an adhesive composition is not limited to this. For example, you may apply an adhesive composition to the bonding surface of the said polarizer 100 instead of the said protective film 300.

In this case, a surface activation treatment such as corona treatment, plasma treatment, ultraviolet irradiation treatment, or electron beam irradiation treatment may be performed on the adhesive surface of the protective film 300 to which the adhesive composition is applied, before the adhesive composition is applied.

In the present invention, the adhesive composition is for bonding the polarizer 100 and the protective film 300 is not particularly limited as long as it is cured by irradiation of active energy rays. More specifically, for example, it may be a cation-curable composition containing a glycidyl ether epoxy compound, an alicyclic epoxy compound and / or an oxetane compound, or may be a radical curable composition containing an acrylic compound and the like.

In addition, the method of apply | coating such an adhesive composition will not be specifically limited if a required amount of adhesive composition can be apply | coated uniformly. More specifically, for example, a doctor blade, a wire bar, a die coating, a comma coating, a gravure coating, or the like may be performed using various coating methods, but is not limited thereto.

Meanwhile, as shown in FIG. 1, the adhesive layer formed as described above may harden the adhesive layer by irradiating the active energy ray using the active energy ray irradiation means 60. In this case, the active energy rays include ultraviolet rays, electron beams, microwaves, infrared rays (IR), X-rays and gamma rays, as well as alpha-particle beams, proton beams, and Neutron beams. Particle beams such as neutron beams may be included, and typically ultraviolet rays or electron beams may be used.

* At this time, the amount of light of the active energy ray irradiated on the adhesive layer may be 500mJ / cm ² to 3000mJ / cm ² , the irradiation time may be 0.1s to 20s. When the light quantity and irradiation time of an active energy ray satisfy | fill the said numerical range, the hardening rate of an adhesive agent is fast and it does not reduce the external appearance characteristic and optical characteristic of a film, and is excellent in productivity. In addition, the irradiation direction of the active energy ray may be performed on the surface of the process film 200, may be performed on the surface of the protective film 300, the adhesive layer is formed, as shown in Figure 1, may be performed on both sides.

The thickness of the adhesive layer cured as described above is preferably 0.1㎛ to 10㎛, 0.3㎛ to 5㎛ or 0.5㎛ to 4.0㎛ in terms of processability. That is, when the thickness of the adhesive layer is 0.1 μm or more, the coating property is excellent, and when the thickness is 10 μm or less, it may have excellent durability.

Next, in the pressing step, a pair of pressing means is disposed on each surface of the process film 200 and the protective film 300, and the process film 200 / the polarizer 100 / the protective film And pressing the stack of 300. More specifically, for example, as shown in FIG. 1, a pair of pressing means sandwiched between the laminate forming the structure of the process film 200 / the polarizer 100 / the protective film 100 is provided. It can be carried out by the method of pressurizing using. Under the present circumstances, although the said press means is not specifically limited, For example, bonding machines, such as the laminate of roll shape 10 and 20, can be used.

In this case, the pressing may be performed at, for example, a pressure of 0.5 MPa to 6 MPa or 1 MPa to 5 MPa. When pressing the laminate of the process film 200 / the polarizer 100 / the protective film 300 at the above pressure, it ensures stable running without damaging the polarizer and at the same time the bubble entering the film bonding Can be removed effectively.

Next, the peeling process may include the step of peeling the process film 200, for example, as shown in FIG. 1, the process film peeled off by peeling the process film 200 ( At the same time as the 200 wound on the film winding roll 220, it may be performed by a method of winding the formed one-sided thin polarizing plate on the polarizing plate winding roll 400.

The method of manufacturing a single-sided thin polarizing plate according to the present invention as described above, since the film supply process, the pressing process and the peeling process can be carried out at the same time in a continuous process using a roll to roll process, production yield This is high and very economical.

If necessary, the manufacturing method of the present invention, as shown in Figure 2, after the step of peeling the process film 200 to form a protective layer on the surface on which the process film 200 is peeled off It may further include. When the protective layer is formed as described above, the polarizer 100 may be prevented from being discolored even in a moisture resistant environment, and the protective layer protects the shrinkage stress of the polarizer in a thermal shock environment to prevent cracks in the polarizer. Since it is possible, the single-sided thin polarizing plate according to the present invention has an advantage of ensuring excellent water resistance and thermal shock resistance.

Here, the forming of the protective layer may be performed by applying a composition for forming a protective layer on one surface of the polarizer 100 and then drying and / or curing the protective layer. For example, as shown in FIG. 2, a protective layer can be formed by apply | coating the composition for protective layer formation using the application | coating means 70, and hardening using the hardening means 80. FIG.

The application means 70 which apply | coats the composition for protective layer formation as mentioned above will not be specifically limited, if a necessary amount of composition for protective layer formation can be apply | coated uniformly. More specifically, for example, a doctor blade, a wire bar, a die coating, a comma coating, a gravure coating, or the like may be performed using various coating methods, but is not limited thereto.

In addition, as shown in FIG. 2, the protective layer formed as described above may harden the adhesive layer by irradiating the active energy ray using the active energy ray irradiation means 80. In this case, the type, the light amount, the irradiation time and the irradiation direction of the active energy ray is the same as described above in the step of forming the adhesive layer.

On the other hand, the thickness of the protective layer cured in the above manner may be, for example, 0.5㎛ to 10㎛ or 0.5㎛ to 7㎛. By preventing cracks from occurring in the polarizing plate in a thermal shock environment, in order to secure thermal shock properties of the thin polarizing plate according to the present invention, the modulus of the protective film and the protective layer is designed to be larger than the shrinkage stress of the polarizer. In this case, the modulus of the protective layer depends on the thickness of the protective layer. When the thickness of the protective layer satisfies the numerical range, the thermal shock resistance of the polarizing plate is increased by increasing the size of the protective film and the modulus of the protective layer rather than the shrinkage stress of the polarizer. There is an advantage that it is easy to secure.

In the present invention, the composition for forming the protective layer is not particularly limited, but considering the process convenience, it is preferable that the composition is cured by active energy ray cured by irradiation of active energy rays. More specifically, the protective layer-forming composition is, for example, a cation-curable composition containing a glycidyl ether epoxy compound, an alicyclic epoxy compound and / or an oxetane compound, or a radical containing an acrylic compound or the like. It may be a curable composition.

On the other hand, the modulus of the protective layer may be, for example, 500MPa to 6000MPa, 1000MPa to 5500MPa or 1500MPa to 5000MPa at 70 ℃. In the present invention, when the modulus of the protective layer has such a value, it is because it is possible to ensure the heat resistance and thermal shock characteristics of the polarizing plate.

Here, modulus is a measure of elastic properties of an arbitrary material and is defined as a proportional coefficient between stress and strain with respect to any spatial position and time in the material. That is, in the case of simple tensile, when sigma is a stress, strain is ε, and modulus is E, σ = E · ε can be defined. In addition, in the present specification, the modulus is a value obtained by measuring a change in frequency response according to stress applied using a DMA (dynamic mechanical analyzer) device of TA Instrument.

In addition, the glass transition temperature (Tg) of the protective layer may be, for example, 70 ℃ to 300 ℃.

Meanwhile, as shown in FIG. 2, the single-sided thin polarizing plate having the protective layer formed thereon may be wound on the polarizing plate winding roll 500 to be manufactured in a roll form.

The thickness of the single-sided thin polarizing plate manufactured according to the present invention may be, for example, 30 μm to 140 μm, 30 μm to 130 μm, or 30 μm to 120 μm.

As described above, in the case of using the method for manufacturing a single-sided thin polarizing plate according to the present invention, a thin polarizing plate having a significantly thin thickness can be manufactured using a thin polarizer having a thickness of 50 μm or less, and it is known that contamination occurs in the manufacturing process. It can be easily prevented and the workability is excellent. In addition, it can be carried out in a continuous process using a roll to roll (roll to roll) process, the production yield is high, there is a very economic advantage.

Example 1

While the polyvinyl alcohol film (manufactured by Nippon Synthetic) having a thickness of 20 µm was moved in a horizontal direction at a speed of 10 M / min under an atmosphere of 25 ° C, the upper surface had a thickness of 38 µm with a process film, and a peeling force with a polarizer. Is supplied with a PET film (manufactured by TSI) having a surface roughness (Ra) of 27 nm or less, and an acrylic film (manufactured by Nippon Catalytic Co., Ltd.) as a protective film on the lower surface thereof, and having a speed of 10 M / min and 2 MPa. Pressure was passed through a pair of rolls. At this time, the UV curable adhesive composition was applied between the polyvinyl alcohol-based film and the protective film to a thickness of 2 μm using a Mayer bar. Thereafter, 500 mJ / cm ² ultraviolet rays were irradiated and cured by using an arc lamp, and the process film was peeled off to prepare a single-sided thin polarizing plate having an acrylic film attached to only one side of the polyvinyl alcohol-based film as a protective film.

Example 2

After peeling off a protective film, the same composition as the ultraviolet curable adhesive composition was apply | coated to the surface from which the protective film was peeled off, and it hardened | cured under the same conditions and formed a protective layer further in the same way as Example 1 A thin polarizing plate was produced.

Comparative Example 1

A polyvinyl alcohol film (manufactured by Nippon Synthetic Co., Ltd.) having a thickness of 20 μm was moved in a horizontal direction at a speed of 10 M / min under an atmosphere of 25 ° C., while an acrylic film (manufactured by Nippon Catalyst Co., Ltd.) was supplied as a protective film to one surface thereof. A pair of rolls was passed at 10 M / min speed and 2 MPa pressure. At this time, the UV curable adhesive composition was applied between the polyvinyl alcohol-based film and the protective film to a thickness of 2 μm using a Mayer bar. After that the single-sided type thin polarizing plate attached to the arc lamp (Arc lamp) 500mJ / after irradiation of the curing ultraviolet ray cm ² polyvinyl alcohol-based film, an acrylic film, a protective film only on one side surface of using a was prepared.

Comparative Example 2

A single-sided thin polarizing plate was produced in the same manner as in Example 1 except that a PET film having a peeling force of 3N with a polarizer was used as the process film.

Comparative Example 3

A single-sided thin polarizing plate was manufactured in the same manner as in Example 1 except that a PET film having a surface roughness (Ra) of 65 nm was used as the process film.

Experimental Example 1-Roll contamination

With respect to the single-sided thin polarizing plates produced by Examples 1 to 2 and Comparative Examples 1 to 3, the presence of roll contamination in the manufacturing process was measured. The measurement was performed by visually confirming the degree of contamination of the area where both ends of the film of the roll press the other surface of the surface on which the protective film is attached. The results are shown in the following [Table 1]. In the case of no contaminated part, X is indicated.

Experimental Example 2-Polarizer Break

With respect to the single-sided thin polarizing plates produced by Examples 1 to 2 and Comparative Examples 1 to 3, the polarizer breakage in the manufacturing process was measured. The measurement was performed by visually checking whether the polarizer was broken in the course of traveling to the polarizing plate winding rolls 400 and 500 after UV curing. The results are shown in the following [Table 1]. In the case where no polarizer breakage occurred, x was shown, and breakage occurred.

Experimental Example 3-Evaluation of Appearance of Polarizer

Using the one-sided thin polarizing plates prepared in Examples 1 to 2 and Comparative Examples 1 to 3, it was visually measured whether or not a phytophytic phenomenon occurred in the polarizer. In the case where an orange peel was not generated due to roughness due to irregularities on the surface of the polarizer, x and a yellow peel were generated. The results are shown in Table 1 below.

Table 1

division	Whether the roll is dirty	Polarizer breakage	Appearance evaluation
Example 1	×	×	×
Example 2	×	×	×
Comparative Example 1	○	○	×
Comparative Example 2	×	○	×
Comparative Example 3	×	×	○

As shown in Table 1, in the case of the single-sided thin plate of the light emitting plate of Example 1 manufactured using the process film and the protective layer after removing the process film, roll contamination and polarizer breakage during the manufacturing process This does not occur, and it can be seen that a polarizer having an excellent appearance can be easily produced without generating a physiological phenomenon.

On the other hand, in the case of the comparative example 1 which manufactured the thin polarizing plate without using a process film, roll contamination generate | occur | produced and the problem which a polarizer fracture generate | occur | produces in the manufacturing process generate | occur | produced. In addition, in the case of Comparative Example 2 using a process film but the peeling force between the polarizer and the process film is greater than 1.0N, the problem that the polarizer fracture occurs in the process of peeling the process film, the surface roughness of the present invention In Comparative Example 3, in which a polarizing plate was manufactured using a process film that deviated from the numerical range of, a problem occurred in that the appearance property was remarkably deteriorated due to the occurrence of a phytic peel phenomenon in the polarizer.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and variations can be made without departing from the technical spirit of the present invention described in the claims. It will be obvious to those who have ordinary knowledge of.

[Description of the code]

10, 20: press roll

30, 40: running roll

50: adhesive composition application means

60, 80: active energy ray irradiation means

70: composition application means for forming a protective layer

100: polarizer

110: polarizer roll

200: process film

210: film roll for process

220: film winding roll for stripped process

300: protective film

310: Protective Film Roll

400: single-sided thin polarizing plate winding roll

500: single-sided thin polarizing plate winding roll with protective layer

Claims (15)

1. Supplying a process film to one surface of a polarizer having a thickness of 50 μm or less;

   Supplying a protective film to the other surface of the polarizer;

   Supplying an adhesive composition between the polarizer and the protective film to form an adhesive layer;

   Arranging a pair of pressing means on each surface of the process film and the protective film to press the laminate of the process film / polarizer / protective film; And

   Peeling the process film,

   The manufacturing method of the single-sided thin polarizing plate whose peeling force between the said polarizer and a process film is 1.0 N or less.
2. The method of claim 1,

   After the step of peeling the process film, the method for producing a single-sided thin polarizing plate further comprising the step of forming a protective layer on the surface on which the process film is peeled off.
3. The method of claim 1,

   The adhesive composition is a method of producing a single-sided thin polarizing plate that is formed using a radical curable composition or a cationic curable composition.
4. The method of claim 2,

   The protective layer is a method of manufacturing a single-sided thin polarizing plate that is formed using a radical curable composition or a cationic curable composition.
5. The method of claim 2,

   The protective layer has a modulus of 500MPa to 6000MPa single-sided thin polarizing plate manufacturing method.
6. The method of claim 2,

   The protective layer has a thickness of 0.5 μm to 10 μm.
7. The method of claim 1,

   The pressing step is a method of manufacturing a single-sided thin polarizing plate that is performed at a pressure of 0.5MPa to 6MPa.
8. The method of claim 1,

   The thickness of the said process film is a manufacturing method of the single-sided thin polarizing plate of 20 micrometers-100 micrometers.
9. The method of claim 1,

   The width | variety of the said process film is a manufacturing method of the single-sided thin polarizing plate larger than the width of a polarizer.
10. The method of claim 1,

    The surface roughness (Ra) of the said process film is a manufacturing method of the single-sided thin polarizing plate of 0.5 nm-60 nm.
11. The method of claim 1,

    The process film is a polyethylene terephthalate film, polyethylene film, polycarbonate film, triacetyl cellulose film, cycloolefin polymer film and acrylic film comprising a one or more selected from the group consisting of acrylic film.
12. The method of claim 1,

    The protective film is a polyethylene terephthalate film, polyethylene film, polycarbonate film, triacetyl cellulose film, cycloolefin polymer film and acrylic film comprising one or more selected from the group consisting of acrylic film.
13. The method of claim 1,

    The polarizer is a method for producing a single-sided thin polarizing plate that is wet stretched or dry stretched.
14. The method of claim 13,

    The wet stretching or dry stretching is a method of manufacturing a single-sided thin polarizing plate that is performed at a draw ratio of 4 times or more.
15. The method of claim 1,

    The single-sided thin polarizing plate has a thickness of 30 μm to 140 μm.

Images