KR20180092730A - Resin composition for polarizing plate - Google Patents

Abstract

The present invention relates to a resin composition for a polarizing plate, a method for manufacturing a polarizing plate, a polarizing plate manufactured by the method, and uses thereof. The resin composition for a polarizing plate of the present invention is thin and easy to bend since the composition is not broken, has excellent durability, is very low in shrinkage force and can suppress light leakage, and can be manufactured as a polarizing plate having excellent dichroic ratio. The polarizing plate made of the resin composition can be applied to various display devices, and particularly applicable to organic light emitting display devices.

Description

[0001] RESIN COMPOSITION FOR POLARIZING PLATE [0002]

The present invention relates to a resin composition for a polarizing plate, a method for producing a polarizing plate, a polarizing plate produced by the method, and uses thereof.

Conventional polarizers used in various display devices such as a liquid crystal display (LCD), an electroluminescence (EL) display, a plasma display (PDP), a field emission display (FED) and an organic light emitting diode (OLED) (PVA, polyvinyl alcohol) as the main component, followed by stretching it in the longitudinal direction (MD, Machine Direction) by 5 times or more. In the conventional polarizer, the iodine ion species was oriented between the PVA stretched in the MD direction, and the polarization performance was realized. This polarization performance can be expressed as an internal dichroic ratio. The conventional PVA polarizer has a dichroic ratio of 130.

However, the conventional polarizer has a problem in terms of durability. First, the conventional polarizing plate is stretched a lot in the MD direction and is very fragile, so a protective film is required on the upper and lower sides. Therefore, since the thickness of the PVA is in the range of 10 탆 to 20 탆 and the thickness of the upper and lower protective films is in the range of 25 탆 to 80 탆, the thickness of the protective film combined with the upper and lower portions of the PVA reaches 60 탆 to 180 탆. Further, in order to produce the final polarizing plate, a thicker thickness is obtained by further including an adhesive, a pressure-sensitive adhesive, a coating layer, a PE protective film and the like.

In addition to physical durability as described above, the durability includes heat resistance and heat and humidity resistance. Conventional PVA polarizers have a property of melting water because PVA has a property of dissolving in water, and the highly oriented PVA is strong in elasticity to return to its original size, and thus has a large shrinking force. Therefore, the polarizing plate is bent in a heat-resistant state due to a high shrinkage force, resulting in a problem that the light leakage phenomenon does not cease.

Due to such a problem, application of conventional PVA polarizers has been limited. Thus, it has been difficult to apply them to applications such as smarter shades and OLED antireflection films, which have recently required polarizer application. Therefore, a polarizing plate for solving such a problem is required.

Korean Patent Registration No. 1632134

The present invention provides a resin composition for a polarizing plate for producing a polarizing plate having a thin thickness, a small thickness, an excellent durability and a low durability, a very low shrinkage force, And a use thereof.

The present application relates to a resin composition for a polarizing plate. Exemplary resin compositions for a polarizing plate include a polymer resin and a dichroic dye. The polymer resin may be a polymer resin having a degree of crystallinity of more than 50% to 99%. The crystallinity was elevated from 30 占 폚 to 200 占 폚 at a rate of 10 占 폚 / min using a differential scanning calorimeter (DSC, Mettler Toledo), and further lowered to 30 占 폚 and then 200 占 폚 The temperature can be measured through a two-step scanning process.

Since the resin composition for a polarizing plate of the present application contains a polymer resin having a degree of crystallinity of more than 50% to 99% and a dichroic dye, it can be easily bent because it is thin and does not break so that it has excellent durability and suppresses light leakage And can be produced as a polarizing plate excellent in dichroic ratio.

The polymer resin may be a polymer resin having a degree of crystallinity of more than 50% to 99%. The polymer resin may be, for example, 51% to 90%, 52% to 80%, or 53% to 70%, and preferably 54% to 70%, insofar as the polymer resin is a polymer resin having a crystallinity within the above- 60%. ≪ / RTI > By using a polymer resin having a crystallinity within the above-mentioned range as a base film of a polarizing plate, the effect of orienting the dye in the course of stretching can be improved compared to the case of using a polymer resin having a crystallinity lower than the above- And can be made into a polarizing plate excellent in dichroic ratio. In addition, since the dichroic dye exists in the amorphous region and does not exist in the crystal region, when a polymer resin having a crystallinity of 100% is used as a base film of a polarizing plate, the dichroic dye has a crystallinity of 100% It may not be adhered to the polymer resin.

As one example, the polymer resin having the degree of crystallinity within the aforementioned range may be a non-liquid crystalline compound. The term " non-liquid crystalline compound " in the present application means a compound which does not contain a moiety capable of exhibiting liquid crystallinity, for example, a mesogen skeleton.

As the kind of the polymer resin, for example, a thermoplastic polymer resin can be used. Specifically, a thermoplastic polymer resin such as polyimide, polyallylate, polyamide, polyamideimide, polyester, polyaryletherketone, polyetherketone, But is not limited to, polypropylene, polypropylene, polyether sulfone, polyether sulfone, polysulfone, polycarbonate, and polypropylene. The above-mentioned kind of polymer resin has an ultraviolet blocking function, and by applying the polarizing plate including the polymer resin to a display device, it can play a role of protecting from ultraviolet rays.

The resin composition for a polarizing plate of the present application includes a dichroic dye. The term " dichroic dye " in the present application means a molecule which exhibits anisotropic absorption behavior of an electron beam in a range of a predetermined wavelength, for example, a molecule capable of absorbing more light in a specific direction than in another direction. Specifically, it absorbs light that vibrates in a stretching direction of a polarizing plate described later, and allows light that oscillates in a vertical direction to pass therethrough, so that polarized light having a specific vibration direction can be obtained.

The resin composition for a polarizing plate including the dichroic dye is thin, easily bendable because it is not broken, has excellent durability, and has a very low shrinkage force to suppress light leakage and can be manufactured as a polarizer having a high dichroic ratio.

The dichroic dye may be present in the amorphous region and not in the crystalline region.

As one example, the dichroic dye may include a repeating unit represented by the following formula (1).

[Chemical Formula 1]

Wherein R ₁ is an alkyl group having 1 to 10 carbon atoms, a phenyl group having an alkyl group having 0 to 10 carbon atoms, a halogen group or RX, R is an organic group, X is F, Cl, Br or I, R _2, R _3, R ₅ , and R ₆ are each hydrogen or an alkyl group having 1 to 5 carbon atoms, or R ₂ and R ₃ or R ₅ and R ₆ are groups in which two adjacent functional groups are linked to each other, R ₄ is an amine group, a heterocyclic compound group or an alkoxy group having 1 to 10 carbon atoms, and n is an integer of 2 or more.

The dichroic dye may be contained in the resin composition for a polarizing plate in an amount of 0.1 part by weight to 1 part by weight based on 100 parts by weight of the polymer resin. For example, the dichroic dye may be added in an amount of 0.2 part by weight to 0.9 part by weight, 0.3 part by weight to 0.8 part by weight, 0.4 part by weight to 0.7 part by weight or 0.5 part by weight to 0.6 part by weight based on 100 parts by weight of the polymer resin, But is not limited to. The resin composition for a polarizing plate containing a dichroic dye in the above-mentioned range is thin, easily bends because it is not broken, has excellent durability, and has a very low shrinkage force to suppress the light leakage phenomenon and can be manufactured as a polarizer excellent in dichroic ratio have.

The present application also relates to a method for producing a polarizing plate. An exemplary method for producing a polarizing plate relates to a method for producing the above-mentioned resin composition for a polarizing plate from a polarizing plate. Therefore, details of the resin composition for a polarizing plate described later can be similarly applied to those described in the resin composition for a polarizing plate, and therefore will not be described.

The method for producing a polarizing plate of the present application includes a step of extruding and stretching a resin composition comprising a polymer resin and a dichroic dye.

The step of extruding is a step for extruding a resin composition containing a polymer resin having a crystallinity of more than 50% to 99% and a dichroic dye into a film, the resin composition being mixed using a mixer, And can be extruded into a single film.

As the type of the mixer, any suitable mixer such as an omni mixer can be used, and the resin composition can be prepared by pre-blending the polymeric resin having the crystallinity of more than 50% to 99% and the dichroic dye.

As the type of the extruder for extruding the resin composition, for example, an extruder such as a uniaxial extruder, a biaxial extruder, or a pressurized kneader can be used, but not limited thereto, preferably a twin-screw extruder.

The details of the polymer resin and the dichroic dye are the same as those described in the polarizing plate, and therefore, the description thereof will be omitted.

As a method for molding the resin composition after it is extruded into a film form, for example, a melt extrusion method, a calender method, a compression molding method and the like can be used, and a melt extrusion method can be preferably used.

When the film is formed by the melt extrusion method, a polymer filter and a T die are sequentially mounted on the tip of a known single-screw extruder or a twin-screw extruder, the resin composition is extruded from the extruder, Filtered through a polymer filter to remove impurities from the resin composition, and the resin composition from which the impurities have been removed is extruded into a film through a T-die to take up a film to obtain a roll-shaped film.

The uniaxial stretching can be achieved by stretching in the extrusion direction by suitably adjusting the temperature of the T die to 130 to 230 캜. Further, simultaneous biaxial stretching and sequential biaxial stretching may be performed by stretching the film in a direction perpendicular to the extrusion direction.

At this time, in the extruding step, the extrusion temperature may be 150 ° C to 200 ° C. For example, the extrusion temperature may be from 160 캜 to 200 캜, from 170 캜 to 200 캜, from 180 캜 to 200 캜, or from 190 캜 to 200 캜. By extruding the resin composition to a temperature within the above-mentioned range, the dichroic dye contained in the resin composition can be extruded without decomposition. Specifically, when the resin composition is extruded at a temperature lower than the above-mentioned range, when the resin composition is not melted and can not be extruded and the resin composition is extruded at a temperature exceeding the above-mentioned range, There may be a problem of flowing out.

The polymer filter may be a known polymer filter, for example, a leaf disk type polymer filter, a pack disk filter, a cylindrical filter, a candle type filter, and the like. The polymer filter may have pores of 5 to 10 탆 and the temperature of the polymer filter may be controlled to be 150 캜 to 250 캜 so that the extruded resin composition can pass through the pores of the polymer filter.

Further, in the extruding step, the thickness of the extruded film, that is, the wound roll-shaped film may be 10 탆 to 200 탆. For example, it may be 30 탆 to 180 탆, 50 탆 to 160 탆, 70 탆 to 140 탆, 90 탆 to 120 탆, or 95 탆 to 105 탆, but is not limited thereto. When the film has a thickness within the above-mentioned range, the thickness of the polarizing plate can be adjusted to be thin in the stretching step to be described later, and thus a polarizing plate having high transmittance can be provided.

The manufacturing method of the polarizing plate of the present application includes a step of stretching. Wherein the stretching step is a step for orienting the film in a predetermined direction, and in the stretching step, the film produced in the extrusion step is stretched by a stretching machine so that the polymeric resin is stretched while the dichroic dye is stretched The polarizing plate produced by orienting can exhibit a high dichroic ratio that is high enough to perform an antireflection function when applied to an organic light emitting device described later.

As the stretching method of the film, a dry stretching method may be used. Specifically, the dry stretching method can be classified into a roll-to-roll stretching method, a heating roll stretching method, a compression stretching method, and a tenter stretching method.

In one example, the stretching may be 5 to 20 times uniaxially stretching. Specifically, the stretching may be performed by stretching the extruded film in the extruding direction, and stretching the extruded film by 5 to 20 times (MD, Machine Direction) or transverse direction (TD, Uniaxial stretching can be performed.

The stretching temperature in the stretching step may be in the vicinity of the glass transition temperature of the polymer resin as the raw material of the film and is preferably (glass transition temperature-30 占 폚) to (glass transition temperature + 100 占 폚) (Glass transition temperature-20 占 폚) to (glass transition temperature + 80 占 폚). If the stretching temperature is lower than (glass transition temperature - 30 占 폚), a sufficient stretching magnification may not be obtained. On the contrary, if the stretching temperature exceeds (glass transition temperature + 100 占 폚) And there is a fear that stable stretching can not be performed.

In one example, the uniaxial stretching may be a step of uniaxially stretching the film 5 to 20 times. For example, the stretching may be performed at 8 to 19 times, 10 to 18 times, 12 to 17 times, or 14 to 16 times, but is not limited thereto. The stretching magnification means the area ratio of the polarizing plate after stretching to the film before stretching. By performing uniaxial stretching at a magnification within the above-mentioned range, the thickness of the polarizing plate can be adjusted to be thin and high transmittance can be obtained.

The thickness of the polarizing plate measured after uniaxially stretching at a stretching magnification within the above-mentioned range may be 10 to 30 占 퐉. For example, the thickness may be from 15 占 퐉 to 29 占 퐉, from 20 占 퐉 to 28 占 퐉, or from 25 占 퐉 to 27 占 퐉, but is not limited thereto. The polarizing plate can have a high transmittance by having a thickness within the above-mentioned range.

The present application also relates to a polarizing plate. An exemplary polarizing plate is manufactured by the above-described method for producing a polarizing plate. Therefore, details of the resin composition for a polarizing plate and the production method of a polarizing plate described later are the same as those described in the resin composition for a polarizing plate and the manufacturing method of a polarizing plate, and therefore, will not be described here.

In one example, the dichroic dye may be included in the polarizing plate in a state aligned in one direction. The term " one-way " in this application means a longitudinal direction (MD) or a transverse direction (TD), and the state of alignment of the dichroic dye in one direction can be determined through the direction in which the polymer resin is stretched in the polarizing plate .

The thickness of the polarizing plate produced through the above-described method for producing a polarizing plate may be 10 탆 to 30 탆. For example, the thickness of the polarizing plate may be 15 탆 to 29 탆, 20 탆 to 28 탆, or 25 탆 to 27 탆, but is not limited thereto. The thickness of the polarizing plate means the thickness after stretching. The polarizing plate can have a high transmittance by adjusting the thickness within the above-mentioned range in order to improve the transmittance which is lowered by the high-crystallinity polymer resin. In addition, since the polarizing plate of the present application does not include the upper and lower protective films like the conventional PVA polarizing plate, a high dichroic ratio can be exhibited even at a thin thickness.

In one embodiment, the polarizing plate may have a unitary transmittance (Ts) measured from one polarizing plate to 35% to 55%. For example, the transmissivity of the polarizing plate may be 37% to 53%, 39% to 51%, or 42% to 49%, and may be adjusted according to purposes or purposes.

In another embodiment, the polarizing plate may have a perpendicular transmittance (Tc) of 3% to 20% measured after orthogonally crossing two polarizing plates so that the absorption axis is 90 °. For example, the orthogonal transmittance of the polarizing plate may be 4% to 18%, 5% to 16%, or 6% to 15%, and may be adjusted according to purposes or purposes.

In another embodiment, the polarizing plate may have a parallel transmittance (Tp) of 20% to 40% measured after arranging the absorption axes parallel to the two polarizing plates. For example, the parallel permeability Tp may be from 25% to 37%, from 30% to 35%, or from 31% to 33%, and may be adjusted depending on the application or purpose.

The polarizing plate may have a high dichroic ratio. The dichroic ratio of the polarizing plate may be, for example, 5 to 30, and specifically 7 to 27, 9 to 25, or 10 to 23. The dichroic ratio can be calculated by the orthogonal transmittance (Tc) and the parallel transmittance (Tp).

 The polarizing plate preferably has an average of values measured in the wavelength range of the visible light region, for example, from 380 nm to 850 nm, more specifically from 400 nm to 850 nm, more specifically from 400 nm to 850 nm The above dichroic ratio can be satisfied. The polarizing plate satisfies the dichroic ratio within the above-mentioned range, and thus can appropriately perform the antireflection function in the organic light emitting element. Further, the polarizing plate satisfying the dichroic ratio within the above-mentioned range exhibits excellent polarization degree and is applicable to various fields or applications .

The polarizing plate has an excellent polarization degree when the dichroic ratio within the above-mentioned range is satisfied. For example, the degree of polarization may be from 53% to 93%, from 56% to 91%, from 59% to 89%, or from 62% to 95% To 88%.

In addition, the polarizing plate may have a very low shrinking force. In one embodiment, the polarizing plate may have a shrinkage force of 0.1 N to 5.0 N measured at isothermal conditions at 80 ° C for 1 hour, for example, the shrinking force of the polarizer is 0.2 N to 4.0 N, 0.3 N to 3.0 N , 0.4 N to 2.0 N, 0.5 N to 1.8 N, 0.6 N to 1.5 N, 0.7 N to 1.2 N, or 0.8 N to 1.1 N. By having the polarizing plate having the shrinking force within the above-mentioned range, the light leakage phenomenon can be suppressed.

The present application also relates to the use of said polarizing plate. The polarizing plate may be applied to various display devices such as a liquid crystal display (LCD), an electroluminescence (EL) display, a plasma display (PDP), a field emission display (FED), an organic light emitting diode (OLED) Particularly, it can be usefully used for an organic light emitting display which requires moisture sensitive and flexible performance. An exemplary organic light emitting display includes the above-mentioned polarizing plate. Therefore, details of the polarizing plate described below can be applied to the polarizing plate described above, and thus will not be described here. The retardation film and the polarizing plate described later in the organic light emitting diode display may be disposed adjacent to the light emitting side of the organic light emitting diode.

When the polarizing plate is applied to the organic light emitting diode display of the present application, it is possible to prevent glare by intercepting reflected light reflected by the upper electrode or the lower electrode, which will be described later.

1 is a diagram illustrating an exemplary OLED display according to an embodiment of the present application. As shown in FIG. 1, the OLED display includes an OLED 10, a retardation film 20, and a polarizer 30. Specifically, the organic light emitting device 10 includes a base substrate, a lower electrode, an organic light emitting layer, an upper electrode, and an encapsulation substrate, although not shown in the drawing.

The base substrate may be a glass or plastic substrate. Preferably, a plastic substrate that is a flexible substrate may be particularly useful as the base substrate.

Either the lower electrode or the upper electrode may be an anode and the other may be a cathode. The anode is an electrode into which holes are injected. The anode may be made of a transparent conductive material having a high work function and emitted light to the outside. For example, the anode may be made of ITO Or IZO. The cathode may be made of a conductive material that has low work function and does not affect the organic material. For example, the cathode may be made of aluminum (Al), calcium Ca) and barium (Ba).

The organic light emitting layer includes an organic material capable of emitting light when a voltage is applied to the lower electrode and the upper electrode.

Between the lower electrode and the organic light emitting layer and between the upper electrode and the organic light emitting layer, a sub layer may be further included although not shown in the drawing. The sub-layer may include a hole transporting layer, a hole injecting layer, an electron injecting layer, or an electron transporting layer for balancing electrons and holes. The electron injection layer, the electron transport layer, the organic light emitting layer, the hole transport layer, the hole injection layer, and the anode in the case where the organic light emitting device is a top emission structure, When the device is a bottom emission structure, the anode, the hole injection layer, the hole transport layer, the organic light emitting layer, the electron transport layer, the electron injection layer, and the cathode may be stacked in this order.

The sealing substrate may be a substrate made of glass, metal, or polymer, and the lower electrode, the organic light emitting layer, and the upper electrode may be sealed to prevent moisture and / or oxygen from being introduced from the outside. The sealing substrate may be omitted in some cases.

The retardation film 20 may be a quarter wave plate. The retardation film 20 can circularly polarize light passing through the polarizing plate 30 to generate a retardation and affect reflection or absorption of light. The retardation film 20 may be omitted in some cases.

As described above, the polarizing plate 30 may be disposed adjacent to the light emitting side of the organic light emitting device. For example, in the case of a bottom emission structure in which light is emitted toward the base substrate, it may be disposed outside the base substrate. In the case of a top emission structure in which light is emitted toward the encapsulation substrate, .

As described above, the polarizing plate is made of a resin composition for a polarizing plate including a polymer resin having a degree of crystallinity of more than 50% to 99% and a dichroic dye, so that the light coming from the outside is reflected by the upper electrode or the lower electrode So that glare can be prevented.

The organic light emitting display may be manufactured by a conventional organic light emitting display device and a manufacturing method other than those described above.

The present application can provide a resin composition for a polarizing plate which can be produced by a thin polarizing plate having a small thickness, an excellent bendability because it does not break, an excellent durability, a very low shrinkage force, Can be applied to various display devices, and particularly applicable to organic light emitting display devices.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating an exemplary embodiment of an organic light emitting device according to an embodiment of the present invention. FIG.
Figs. 2 and 3 are graphs showing the results of measurement of the light intensity after measurement of the PVA polarizing plate of Comparative Example 1 and the PP polarizing plate of Example 1 in a liquid crystal cell after heating for 48 hours at a temperature of 60 DEG C and a moisture- to be.

Hereinafter, the present application will be described in more detail by way of examples according to the present application and comparative examples not complying with the present application, but the scope of the present application is not limited by the following examples.

Example  One

Production of Polarizer

(G-241, Hayashibara) represented by the following formula (2) to 100 parts by weight of a polypropylene resin having a crystallinity of 54.3% (HA748L, Polymira), and this was mixed with a twin screw extruder (PRISM TSE 16TC, Manufactured by Thermo Electron Corporation, L / D: 40, 16?) To form a film having a thickness of 100 占 퐉. Then, the film was uniaxially stretched 15 times by a uniaxial stretching machine (UTM Z010, Zwick Roell) to prepare a polarizing plate having a thickness of 26.6 탆.

(2)

Example  2

Production of Polarizer

A polarizing plate was prepared in the same manner as in Example 1, except that the dichroic dye was an X12 black dye of BASF, which was a mixture of three dyes represented by the following formulas (3), (4)

(3)

[Chemical Formula 4]

[Chemical Formula 5]

Comparative Example  One

Polarizer  Produce

A polyvinyl alcohol film (M2005, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) was dyed with iodine ions and stretched 5.5 times in the MD direction in the uniaxial stretching machine to prepare a 22.0 탆 thick polarizer.

Comparative Example  2

Production of Polarizer

0.5 parts by weight of a dichroic dye (G-241, Hayashibara) represented by the above formula (2) was mixed with 100 parts by weight of a polypropylene resin having a crystallinity of 39.5% (RM5300, Manufactured by Thermo Electron Corporation, L / D: 40, 16?) At a temperature of 200 占 폚 to form a film having a thickness of 100 占 퐉. Thereafter, the film was uniaxially stretched 9 times in a uniaxial stretching machine (UTM Z010, Zwick Roell Co.) to produce a polarizing plate having a thickness of 13.5 占 퐉.

Experimental Example  1. Optical Characterization

The polarizing plates prepared in the above Examples and Comparative Examples were cut into a size of 40 mm x 40 mm, and the specimens were fixed in a measurement holder. The polarizing plates were then measured for ultraviolet transmittance (V-7100, manufactured by JASCO Co., Ltd.) Ts, orthogonal transmission (Tc), polarization degree (PE) and dichroic ratio (DR) were measured. The orthogonal transmittance (Tc) is a measurement value measured after orthogonally crossing the two polarizing plates so that the absorption axes thereof are 90 degrees, and the orthogonal basis transmittance (Tc) The average values of the values measured for all the wavelengths of 450 nm to 850 nm are shown in Table 1 below.

Thickness (㎛) Ts (%) Tc (%) P.E (%) DR Example 1 26.6 42.8 6.6 87.5 22.6 Example 2 21.2 48.4 14.7 62.0 10.5 Comparative Example 1 22.0 42.1 0.0016 99.9 64 Comparative Example 2 13.5 40.3 11.0 64.3 4.8

Experimental Example  2. Evaluation of contractility

The polarizing plates prepared in Examples and Comparative Examples were measured for retraction force by DMA (Q800, TA) under an isothermal condition at 80 DEG C for 1 hour, and the results are shown in Table 2 below.

division Shrinkage (N) Example 1 0.9 Example 2 1.0 Comparative Example 1 6.5 Comparative Example 2 1.2

As shown in Table 1, it can be confirmed that the dichroic ratio of the PVA polarizer of Comparative Example 1 is higher than that of the PP polarizer of Examples 1 and 2. However, as shown in Table 2, the PVA polarizer of Comparative Example 1 It can be seen that the polarizer has a high elasticity to return the PVA to its original size after stretching, so that the shrinking force is much higher than that of the PP-based polarizing plates of Examples 1 and 2. That is, the PVA polarizer of Comparative Example 1 has a problem that the polarizing plate is bent in a heat-resistant state due to a high shrinkage force, and the light leakage phenomenon does not cease.

Figs. 2 and 3 are graphs showing the results of measurement of the light intensity after measurement of the PVA polarizing plate of Comparative Example 1 and the PP polarizing plate of Example 1 in a liquid crystal cell after heating for 48 hours at a temperature of 60 DEG C and a moisture- to be. As shown in Fig. 2, the PVA polarizing plate of Comparative Example 1 was found to have a light leakage phenomenon at a corner part due to the heat and moisture resistance of the PVA. As shown in Fig. 3, Of the PP-based polarizer does not cause a light leakage phenomenon.

As shown in Table 1, the PP type polarizing plate of Comparative Example 2, which was made of a PP having a lower degree of crystallinity than the PP type polarizing plates of Examples 1 and 2, had a dichroic ratio It can be confirmed that it is low.

10: Organic light emitting device
20: retardation film
30: polarizer

Claims (16)

A resin composition for a polarizing plate, comprising a polymer resin having a crystallinity of more than 50% to 99% and a dichroic dye. The resin composition for a polarizing plate according to claim 1, wherein the polymer resin is a non-liquid crystalline compound. The method of claim 1, wherein the polymer resin is selected from the group consisting of polyimide, polyallylate, polyamide, polyamideimide, polyester, polyaryletherketone, polyetherketone, polyetherimide, polyfumarate ester, polyethersulfone, polysulfone , A polycarbonate, and a polypropylene. The resin composition for a polarizing plate according to claim 1, wherein the polymer resin is polypropylene. The resin composition for a polarizing plate according to claim 1, wherein the dichroic dye comprises a repeating unit represented by the following formula (1)
[Chemical Formula 1]

Wherein R ₁ is an alkyl group having 1 to 10 carbon atoms, a phenyl group having an alkyl group having 0 to 10 carbon atoms, a halogen group or RX, R is an organic group, X is F, Cl, Br or I, R _2, R _3, R ₅ , and R ₆ are each hydrogen or an alkyl group having 1 to 5 carbon atoms, or R ₂ and R ₃ or R ₅ and R ₆ are groups in which two adjacent functional groups are linked to each other, R ₄ is an amine group, a heterocyclic compound group or an alkoxy group having 1 to 10 carbon atoms, and n is an integer of 2 or more. The resin composition for a polarizing plate according to claim 1, wherein the dichroic dye is contained in an amount of 0.1 part by weight to 1 part by weight based on 100 parts by weight of the polymer resin. Extruding a resin composition comprising a polymeric resin having a crystallinity of more than 50% to 99% and a dichroic dye into a film; And
And stretching the film. The method of manufacturing a polarizing plate according to claim 7, wherein the extruding step has an extrusion temperature of from 150 캜 to 200 캜. The method for producing a polarizing plate according to claim 8, wherein the thickness of the film after extrusion is from 10 탆 to 200 탆. The method of producing a polarizing plate according to claim 7, wherein the stretching is 5 to 20 times uniaxially stretching. A polarizing plate produced by the method for producing a polarizing plate of claim 7. The polarizer according to claim 11, wherein the thickness of the polarizer is 10 占 퐉 to 30 占 퐉. 12. The polarizing plate according to claim 11, wherein the dichroic ratio is 5 to 30. 12. The polarizing plate according to claim 11, wherein the degree of polarization is 50% to 95%. 12. The polarizing plate according to claim 11, wherein the shrinkage force measured at isothermal conditions at 80 DEG C for 1 hour is 0.1 N to 5.0 N. An organic light emitting device, a retardation film disposed adjacent to the light emitting side of the organic light emitting device, and a polarizing plate according to claim 11.

Images