KR20140021260A - Reflective polarizer having dispered polymer - Google Patents

Abstract

A reflective polarizer of the present invention does not include a core layer nor a separate adhesive layer and/or a protective layer (PBL) that are installed between the core layer and a skin layer because a plurality of groups of different average optical thickness are integrally formed. This allows production cost to be reduced remarkably as well as to maximize an optical property within the limited thickness. Also, a plurality of groups of different average optical thickness is formed so that the visible light wavelength region of an S wave can be reflected. Furthermore, because a polymer inside a substrate has a plate-shaped polarizer, excellent optical properties can be achieved even though it has a very small number of double reflective polymers compared with a same area containing the reflective polarizer with original double reflective polymers. Also, the reflective polarizer of the present invention can maximize antistatic performance without having to smear an antistatic agent or dust on the surface in order not to result in luminance degradation and color deviation. In addition, the invention can improve scratch resistance and maintain transparency without any color deviation which also result in having a high UV absorbing ability.

Description

Reflective polarizer having dispered polymer

The present invention relates to a reflective polarizer in which a polymer is dispersed, and more particularly, to provide a reflective polarizer in which a polymer having high antistatic ability and in which luminance is not lowered is dispersed.

Flat panel display technology is mainly composed of liquid crystal display (LCD), projection display, and plasma display (PDP), which have already secured a market in the TV field. In addition, field emission display (FED) and electroluminescence display (ELD) And it is expected to occupy the field according to each characteristic. Liquid crystal displays are currently being used in a wide range of applications such as notebook computers, personal computer monitors, liquid crystal TVs, automobiles, and aircrafts, accounting for 80% of the flat panel market, and booming demand for LCDs worldwide.

Conventional liquid crystal displays place a liquid crystal and an electrode matrix between a pair of light absorbing optical films. In liquid crystal displays, the liquid crystal portion has an optical state that changes accordingly by moving the liquid crystal portion by an electric field generated by applying a voltage to the two electrodes. This process displays an image by using a polarized light in a specific direction as a 'pixel' containing information. For this reason, liquid crystal displays include a front optical film and a rear optical film that induce polarization.

  The optical film used in such a liquid crystal display does not necessarily have a high utilization efficiency of light emitted from the backlight. This is because 50% or more of the light emitted from the backlight is absorbed by the back side optical film (absorption type polarizing film). Therefore, in order to improve the utilization efficiency of the backlight in the liquid crystal display, a reflection type polarizer is provided between the optical cavity and the liquid crystal assembly.

  1 is a view showing the optical principle of a conventional reflective polarizer. Specifically, the P polarized light from the optical cavity toward the liquid crystal assembly is transmitted through the reflective polarizer to the liquid crystal assembly. The S polarized light is reflected from the reflective polarizer into the optical cavity, Direction is reflected in a randomized state and is then transmitted to the reflective polarizer so that the S polarized light is converted into P polarized light that can pass through the polarizer of the liquid crystal assembly and is transmitted to the liquid crystal assembly after passing through the reflective polarizer.

The selective reflection of the S polarized light and the transmission of the P polarized light with respect to the incident light of the reflective polarizer are performed in such a manner that the refractive index of each optical layer in the state of alternately stacking the flat optical layer having the anisotropic refractive index and the flat optical layer having the isotropic refractive index The optical thickness of each of the optical layers in accordance with the difference and the elongation process of the laminated optical layer, and the change of the refractive index of the optical layer.

  That is, the light incident on the reflective polarizer repeats the reflection of the S polarized light and the transmission of the P polarized light while passing through each optical layer, and finally, only the P polarized light of the incident polarized light is transmitted to the liquid crystal assembly. On the other hand, as described above, the reflected S polarized light is reflected in the polarization state of the diffused reflection plane of the optical cavity in a randomized state and then transmitted to the reflective polarizer. As a result, it is possible to reduce the waste of power with loss of light generated from the light source.

 However, the conventional reflective polarizer has an optical thickness and a refractive index between the optical layers that can be optimized for selective reflection and transmission of incident polarization by alternately stacking isotropic optical layers and anisotropic optical layers having different refractive indices. Since it is manufactured to have, there was a problem that the manufacturing process of the reflective polarizer is complicated. In particular, since each optical layer of the reflective polarizer has a flat plate structure, the P polarized light and the S polarized light must be separated in accordance with a wide incident angle range of incident polarized light, so that the number of layers of the optical layer is excessively increased and the production cost exponentially There was an increasing problem. Further, there is a problem that optical performance is deteriorated due to optical loss due to the structure in which the number of layers of the optical layer is excessively formed.

2 is a cross-sectional view of a conventional multilayer reflective polarizer (DBEF). Specifically, in the multilayer reflective polarizer, the skin layers 9 and 10 are formed on both sides of the core layer 8. The core layer 8 is divided into four groups (1, 2, 3, 4), in which each of the isotropic layers and the anisotropic layers are alternately stacked to form approximately 200 layers. Separate adhesive layers 5, 6, and 7 are formed between the four groups 1, 2, 3, and 4 forming the core layer 8. In addition, since each group has a very thin thickness of about 200 layers, these groups often contain a protective layer (PBL) since individual groups can be damaged if they are individually pneumatically shipped. In this case, there is a problem that the thickness of the core layer becomes thick and the manufacturing cost rises. In addition, since the reflective polarizer included in the display panel is limited in the thickness of the core layer for slimming, if the adhesive layer is formed on the core layer and / or the skin layer, the core layer is reduced by the thickness thereof, There was no problem. Further, since the inside of the core layer and the core layer and the skin layer are bonded by the adhesive layer, there is a problem that when the external force is applied, the elapse of time elapses, or the storage place is poor, delamination occurs. In addition, not only the defect rate is excessively increased in the process of adhering the adhesive layer, but also the destructive interference to the light source occurs due to the formation of the adhesive layer.

Skin layers 9 and 10 are formed on both sides of the core layer 8 and separate adhesive layers 11 and 12 are formed between the core layer 8 and the skin layers 9 and 10 for bonding them. do. When the conventional skin layer of polycarbonate and PEN-coPEN are integrated with the alternately laminated core layer by co-extrusion, peeling may occur due to the compatibility member and the crystallization degree is about 15% There is a high risk of occurrence of birefringence. Accordingly, in order to apply the polycarbonate sheet of the non-smelting process, an adhesive layer has to be formed. As a result, the yield decreases due to external foreign matters and process defects due to the addition of the adhesive layer process. Generally, in producing a polycarbonate-free sheet of the skin layer, birefringence occurs due to uneven shear pressure due to the winding process, It is necessary to control the molecular structure of the polymer and speed control of the extrusion line in order to compensate for the deterioration of productivity.

The method of producing the conventional multilayer reflective polarizer described above will be briefly described. After four co-extruded groups having different average optical thicknesses forming the core layer are separately co-extruded, the four co-extruded four groups are stretched, And then the four layers are adhered with an adhesive to form a core layer. This is because the peeling phenomenon occurs when the core layer is stretched after bonding the adhesive. Thereafter, the skin layers are bonded to both sides of the core layer. As a result, in order to construct a multi-layer structure, a two-layer structure is folded to form a four-layer structure, and a group (209-layer) is formed through a process of forming a multi-layer structure in a continuous folding manner. It was difficult to form a group in the multilayer in the process. As a result, four groups having different average optical thicknesses have to be separately co-extruded and bonded.

Since the above-described process is intermittently performed, a remarkable increase in the manufacturing cost has been brought about. As a result, the cost of all the optical films included in the backlight unit is the most expensive. As a result, there has been a serious problem that liquid crystal displays other than the reflective polarizer are frequently released even when the decrease in luminance is reduced in terms of cost reduction.

Accordingly, a reflective polarizer in which a polymer capable of achieving the function of the reflective polarizer by dispersing a birefringent polymer extending in the longitudinal direction inside the substrate rather than the multilayer reflective polarizer has been proposed. 3 is a perspective view of a reflective polarizer 20 including a rod-shaped polymer, in which birefringent polymers 22 stretched in the longitudinal direction are arranged in one direction inside the base material 21. Fig. The birefringent interface between the base material 21 and the birefringent polymer 22 causes a light modulation effect to perform the function of the reflection type polarizer. However, as compared with the above-mentioned alternately stacked reflective polarizer, it is difficult to reflect light in the entire wavelength range of visible light, resulting in a problem that the light modulation efficiency is too low. Accordingly, in order to have a transmittance and a reflectance similar to those of the alternately stacked reflective polarizer, an excessively large number of birefringent polymers 22 must be disposed inside the substrate. Specifically, in order to have optical properties similar to those of the above-described laminate-type reflective polarizer in the substrate 21 having a width of 1580 mm and a height (thickness) of 400 μm or less when a horizontal 32-inch display panel is manufactured on the basis of the vertical cross section of the reflective polarizer, At least 100% of circular or elliptical birefringent polymer 22 having a cross-sectional diameter in the longitudinal direction of 0.1 to 0.3 탆 must be contained. In this case, not only the production cost is excessively increased but also the facilities are excessively complicated, There is a problem that it is difficult to produce the facility itself and thus it is difficult to commercialize it. Further, since it is difficult to make various optical thicknesses of the birefringent polymer 22 contained in the sheet, it is difficult to reflect light in the entire visible light region, and there is a problem that the physical properties are reduced.

In order to overcome this problem, a technical idea including a birefringent sea chart was proposed in the substrate. FIG. 4 is a cross-sectional view of a birefringent chart paper included in the inside of the base material. The birefringent chart paper can generate a light modulation effect at the light modulation interface of the internal part and the dissolution part, The optical properties can be achieved without arranging chart marks. However, since the fiber is a birefringent graphite sheet, compatibility with a base material such as a polymer, ease of handling, and adhesiveness have been encountered. Furthermore, the light-scattering is induced by the circular shape, and the reflection polarizing efficiency against the light wavelength in the visible light region is lowered. As a result, the polarizing characteristic is lowered compared with the existing product and the luminance improvement is limited. In addition, As the area is subdivided, due to the occurrence of pores, light leakage, that is, light loss phenomenon, has been caused. In addition, due to the structure of the fabric in the form of a structure, there is a problem that limitations are imposed on improvement of reflection and polarization characteristics due to limitations of the layer structure.

 SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a first object of the present invention is to provide a reflective polarizer in which a polymer capable of achieving various target properties is dispersed.

The second object of the present invention is to disperse a polymer employing a reflective polarizing film in which a novel polymer is dispersed, which can enhance luminance as compared to a reflecting polarizer in which a polymer employing a reflective polarizing film in which a conventional polymer is dispersed. To provide a reflective polarizer.

In order to solve the above problems, the reflective polarizer in which the polymer of the present invention is dispersed includes a plurality of plate-shaped polymers dispersed in the substrate in order to transmit the first polarized light irradiated from the outside and reflect the second polarized light. The plate-shaped polymer of has a refractive index different from the substrate in at least one axial direction, the substrate is elongated in at least one axial direction, The plurality of plate-shaped polymers each form a group to reflect the transverse wave (S wave) of a desired wavelength, the plurality of groups are formed, the core layer having a different average optical thickness of the plate-shaped polymer between groups; And a skin layer which is integrally formed on at least one surface of the core layer and includes, alone or in combination, an inorganic fine particle and a surfactant having an antistatic ability.

According to a preferred embodiment of the present invention, the reflective polarizer includes an adhesive layer and a protective film on at least one surface, the adhesive layer may include a surfactant having an antistatic ability.

According to another preferred embodiment of the present invention, the surfactant having an antistatic ability is alkyl sulfate ester, alkyl aryl sulfonic acid or alkyl phosphate ester, quaternary ammonium salt or imidazoline, alkylbetaine, alkylimidazoline, At least one selected from the group consisting of alkylalanine, sorbitan fatty acid ester, glycerol fatty acid ester, poly (oxyethylene) alkylamine and poly (oxyethylene) alkyl ether.

According to another preferred embodiment of the present invention, the surfactant having an antistatic ability may include 1 to 20% by weight based on 100% by weight of the skin layer.

According to another preferred embodiment of the present invention, the inorganic fine particles may be colloidal silica or UV-resistant agent.

According to another preferred embodiment of the present invention, the colloidal fine particles may be colloidal silica having an average diameter of 1 ~ 200nm.

According to another preferred embodiment of the present invention, the UV-resistant agent is composed of hydroxybenzophenone, hydroxyphenyl benzotriazole, cyanoacrylate, oxanilide, hydroxyphenyl triazine and benzoxazinone It may be any one or more selected from the group.

According to another preferred embodiment of the present invention, the inorganic fine particles may be silica particles of 1 to 5㎛ size for improving scratch resistance.

According to a preferred embodiment of the present invention, the first polarization may be longitudinal, and the second polarization may be transverse.

According to another preferred embodiment of the present invention, the substrate is polyethylene naphthalate (PEN), copolyethylene naphthalate (co-PEN), polyethylene terephthalate (PET), polycarbonate (PC), polycarbonate (PC) Earl Roy, polystyrene (PS), heat-resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene styrene (ABS) , Polyurethane (PU), polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), polyamide (PA), polyacetal (POM), phenol And at least one of epoxy (EP), urea (UF), melanin (MF), unsaturated polyester (UP), silicone (SI), elastomer and cycloolefin polymer.

According to another preferred embodiment of the present invention, the polymer is polyethylene naphthalate (PEN), copolyethylene naphthalate (co-PEN), polyethylene terephthalate (PET), polycarbonate (PC), polycarbonate (PC) Alloy, polystyrene (PS), heat-resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene styrene (ABS ), Polyurethane (PU), polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), polyamide (PA), polyacetal (POM), It may be one or more of phenol, epoxy (EP), urea (UF), melanin (MF), unsaturated polyester (UP), silicone (SI), elastomer and cycloolefin polymer.

According to another preferred embodiment of the present invention, the difference in the refractive index of the substrate and the polymer may be greater than the difference in the refractive index of the extended axial direction of the other axial refractive index.

According to another preferred embodiment of the present invention, the refractive index of the substrate and the polymer may have a difference in refractive index of 0.05 or less in two axial directions and a difference in refractive index of the other one axial direction of 0.1 or more.

According to another preferred embodiment of the present invention, the polymer may be elongated in the longitudinal direction.

According to another preferred embodiment of the present invention, the plurality of polymers may form three groups to reflect light of three wavelength bands.

According to another preferred embodiment of the present invention, the plurality of polymers may form four groups to reflect light in four wavelength bands.

According to another preferred embodiment of the present invention, the optical thickness of the polymer may be 1/4 of the desired light wavelength (λ).

According to another preferred embodiment of the present invention, the desired wavelength may include a visible light band.

According to another preferred embodiment of the present invention, the optical thickness of the polymers included in the same group may have a thickness deviation within 30% of the average optical thickness.

According to another preferred embodiment of the present invention, the optical thickness of the polymers included in the same group may have a thickness deviation within 20% of the average optical thickness.

According to another preferred embodiment of the present invention, the optical thickness of the polymers included in the same group may have a thickness deviation within 15% of the average optical thickness.

According to another preferred embodiment of the present invention, the three reflection bands may include a wavelength band of 450nm, 550nm and 650nm.

According to another preferred embodiment of the present invention, the four reflection bands may include a wavelength band of 350nm, 450nm, 550nm and 650nm.

According to another preferred embodiment of the present invention, the plurality of groups may have an average optical thickness of at least 5%, more preferably at least 10%.

According to another preferred embodiment of the present invention, the plurality of groups may form a plurality of spaced apart layers based on the longitudinal cross section of the polymer.

According to another preferred embodiment of the present invention, the plurality of polymers included in one group are arranged spaced apart from each other and at least 25 or more and more preferably 50 or more spaced layers based on the longitudinal cross section of the polymer. Can be formed.

According to another preferred embodiment of the present invention, the plate-shaped polymer has an aspect ratio of the short axis length to the long axis length based on the vertical section in the longitudinal direction of 1/1000 or less, 1/2000 or less, 1/3000 or less, 1 / It may be 5000 or less, 1/10000 or less, 1/20000 or 1/30000 or less.

According to another preferred embodiment of the present invention, a birefringent interface may be formed on the polymer and the substrate �.

According to another preferred embodiment of the present invention, the polymer has optical birefringence, and the substrate may be optically isotropic.

According to another preferred embodiment of the present invention, an adhesive layer may not be formed between the group and the group and / or between the core layer and the skin layer.

Hereinafter, terms used in this specification will be briefly described.

'Polymer has birefringence' means that when light is irradiated to fibers of different refractive index along the direction, the light incident on the polymer is refracted into two light beams with different directions.

'Isotropic' means that the refractive index is constant regardless of direction when light passes through the object.

'Anisotropy' means that the optical properties of an object are different according to the direction of light, and anisotropic objects have birefringence and correspond to isotropy.

'Light modulation' means that the irradiated light reflects, refracts, scatters, changes the intensity of the light, the period of the wave or the nature of the light.

The 'aspect ratio' means the ratio of the shortening length to the longest length based on the vertical section in the longitudinal direction of the elongated body.

Since the reflective polarizer of the present invention is formed integrally with a plurality of groups having different average optical thicknesses, a separate adhesive layer and / or protective layer PBL is not included in the core layer and between the core layer and the skin layer. This makes it possible to remarkably reduce the manufacturing cost and to maximize optical properties at a limited thickness. In addition, since a plurality of groups having different average optical thicknesses are formed, all S waves in the visible light wavelength region can be reflected. Furthermore, since the polymer inside the substrate has a plate-like shape, it is possible to achieve very excellent optical properties even when the bipolar birefringent polymer contains a very small number of the same area compared to the reflective polarizer including the conventional birefringent polymer.

In addition, the reflective polarizer of the present invention can maximize the antistatic performance without generating a decrease in brightness and color deviation without the antistatic agent on the surface. In addition, scratch resistance is improved, transparency is maintained, and it has high UV absorption ability without color deviation.

1 is a schematic view for explaining the principle of a conventional reflective polarizer.
2 is a cross-sectional view of a currently used multi-layer reflective polarizer (DBEF).
3 is a perspective view of a reflection type polarizer including a bar-shaped polymer.
4A is a cross-sectional view showing a path of light incident on a birefringent island-in-the-sea yarn used in a reflective polarizer.
Figure 4b is a cross-sectional view of a reflective polarizer including a protective film according to an embodiment of the present invention.
5 is a cross-sectional view of a reflective polarizer according to an exemplary embodiment of the present invention.
6 is a cross-sectional view of a reflective polarizer according to another exemplary embodiment of the present invention.
7 is a cross-sectional view of a reflective polarizer according to another preferred embodiment of the present invention.
8 is a perspective view of a reflective polarizer according to an exemplary embodiment of the present invention.
9 is a cross-sectional view of a plate-like polymer according to an embodiment of the present invention.
10 and 11 are perspective views showing the coupling structure of the distribution plate of the sea-island extrusion mold that can be used in the present invention.
12 is a cross-sectional view of the distribution plate according to another preferred embodiment of the present invention.
13 and 14 are cross-sectional views showing in detail the arrangement of the island component supply path of the detention distribution plate according to an embodiment of the present invention.
15 and 16 are perspective views showing the coupling structure of the distribution plate of the sea-island type extrusion mold that can be used in the present invention.
17 is a view showing a plurality of islands-in-the-sea extrusion molds according to an embodiment of the present invention.
18 is a schematic view including first pressurizing means to form two islands-in-the-sea composite flows in accordance with one preferred embodiment of the present invention.
19 is a schematic diagram comprising two second pressurizing means to form two islands-in-the-sea composite flow according to one preferred embodiment of the present invention.
20 is a schematic view including one second pressurizing means to form two islands-in-the-sea composite flow according to one preferred embodiment of the present invention.
21 is a schematic view showing the lamination of the island-in-the-sea composite products according to one preferred embodiment of the present invention.
Figure 22 is a cross sectional view of a coat-hanger die in accordance with a preferred embodiment of the present invention, and Figure 23 is a side view.
24 is a schematic diagram of an apparatus for manufacturing a reflective polarizer in which a polymer is dispersed according to a preferred embodiment of the present invention.
25 is a schematic diagram of an apparatus for manufacturing a reflective polarizer in which a polymer is dispersed according to another exemplary embodiment of the present invention.
26 is a schematic diagram of an apparatus for manufacturing a reflective polarizer in which a polymer is dispersed according to another preferred embodiment of the present invention.
27 is an exploded perspective view of a reflective polarizer in which a polymer including a reflective polarizer of the present invention is dispersed according to another preferred embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail with reference to the accompanying drawings.

The reflective polarizer in which the polymer of the present invention is dispersed includes a plurality of plate-shaped polymers dispersed inside the substrate, in order to transmit the first polarized light irradiated from the outside and reflect the second polarized light, wherein the plurality of plate-shaped polymers are formed on the substrate. The refractive index differs in at least one axial direction, and the substrate extends in at least one axial direction, The plurality of plate-shaped polymers each form a group to reflect the transverse wave (S wave) of a desired wavelength, the plurality of groups are formed, the core layer having a different average optical thickness of the plate-shaped polymer between groups; And a skin layer which is integrally formed on at least one surface of the core layer and includes, alone or in combination, inorganic fine particles and a surfactant having an antistatic ability.

As a result, the reflective polarizer of the present invention does not include a separate adhesive layer and / or protective layer (PBL) inside the core layer and between the core layer and the skin layer because a plurality of groups having different average optical thicknesses are integrally formed. This makes it possible to remarkably reduce the manufacturing cost and to maximize optical properties at a limited thickness. In addition, since a plurality of groups having different average optical thicknesses are formed, all S waves in the visible light wavelength region can be reflected. Furthermore, since the polymer inside the substrate has a plate-like shape, it is possible to achieve very excellent optical properties even when the bipolar birefringent polymer contains a very small number of the same area compared to the reflective polarizer including the conventional birefringent polymer.

5 is a cross-sectional view of a reflective polarizer according to an exemplary embodiment of the present invention. Specifically, skin layers 186 and 187 are formed on both surfaces of the core layer 180, and the core layer 180 is divided into two groups A and B. In the drawing, a dotted line dividing groups A and B means a virtual line. The average optical thicknesses of the first components contained in the group A are different from the average optical thicknesses of the first and second polymer components 181 and 182 and the first component included in the group B, This makes it possible to reflect different wavelengths of light.

In addition, the optical thickness of the plate-shaped polymers 181 and 182 as the first component included in the group A is within 30%, preferably within 20%, more preferably within 15% based on the average optical thickness of the group A. It may have an optical thickness deviation. In this case, the optical thickness means n (refractive index) x d (physical thickness). On the other hand, the wavelength of light and the optical thickness are defined by the following relational expression (1).

[Relation 1]

λ = 4nd

Where? Is the wavelength of light (nm), n is the refractive index, d is the physical thickness (nm)

Therefore, if the average optical thickness of the group A is 100 nm, the transverse wave (S wave) of 400 nm wavelength can be reflected by the relational formula (1). In this case, if the thickness deviation is 20%, the wavelength band of about 320 to 480 nm can be covered. If the average optical thickness of the group B plate-like polymers 233 and 234 is 130 nm, the transverse wave (S wave) of 520 nm wavelength can be reflected by Relation 1, and if the thickness deviation is 20% It is possible to cover the wavelength band and partially overlap the wavelength band of the group A, thereby maximizing the light modulation effect. In addition, when the plate-like polymer, which is the first component, has optical birefringence, P waves must be transmitted and S waves must be reflected, so that the refractive index n is set based on the thickness direction (z-axis refractive index) through which light passes, and the average optical thickness is calculated. can do.

On the other hand, the maximum value of the distance between the polymers in the groups A and B may be smaller than the maximum value of the distance between the plate-shaped polymers between the groups A and B. Specifically, the maximum value d ₁ of the distance between the plate-shaped polymers of group A and the maximum value d ₂ of the distance between polymers of group B are smaller than the maximum value d _{3 of the} distance between polymers of groups A and B. In other words, the spacing between the plate-shaped polymers in the same group may be smaller than the distance between polymers between adjacent groups, and thus may be integrally formed between groups even without forming an adhesive layer between groups.

In addition, the polymers dispersed in the core layer form a plurality of layers having a space between them. In this case, the number of layers formed by the plate-shaped polymers in one group may be 25 or more, preferably 50 or more, more preferably 100 or more, and most preferably 150 or more.

On the other hand, there is no adhesive layer between the group and the group is formed integrally. It is also integrally formed between the core layer and the skin layer. As a result, the deterioration of the optical properties due to the adhesive layer can be prevented, and more layers can be added to the limited thickness, thereby significantly improving the optical properties. Furthermore, since the skin layer is manufactured at the same time as the core layer and then the stretching process is performed, the skin layer of the present invention can be stretched in at least one axial direction, unlike the conventional core layer stretching, after the stretching with the unstretched skin layer. As a result, the surface hardness is improved compared to the unstretched skin layer, thereby improving scratch resistance and heat resistance.

On the other hand, the skin layer of this invention contains an inorganic fine particle and surfactant which has antistatic ability individually or in mixture.

First, the surfactant which has antistatic ability is demonstrated. Conductive polymers and / or metal salts, which are used as antistatic agents in conventional optical films, may improve antistatic performance, but may cause luminance deterioration and color deviation. Accordingly, the present invention minimizes the occurrence of luminance degradation and color deviation while maximizing the antistatic performance by using a surfactant having an antistatic ability. Furthermore, since the antistatic agent is not included in the adhesive layer and the antistatic agent is included in the skin layer from the manufacturing stage of the reflective polarizer, the surface of the reflective polarizer may be prevented from getting defects such as stains or the like.

Surfactants having antistatic properties usable herein include poly (oxyethylene) alkylamines, poly (oxyethylene) alkylamides, poly (oxyethylene) alkyl ethers, poly (oxyethylene) alkyl phenyl ethers, glycerol fatty acid esters or Nonionic agents such as sorbitan fatty acid esters, anionic agents such as alkylsulfonates, alkyl benzene sulfonates, alkyl sulfates or alkyl phosphates, quaternary ammonium chlorides, quaternary ammonium sulfates or quaternary ammonium nitrates Sex agents or amphoteric agents such as alkylbetaine type, alkylimidazoline type or alkylalanine type can be used. Amphoteric agents such as alkylbetaine type, alkylimidazoline type or alkylalanine type are preferred.

In addition, the amount of the surfactant having an antistatic ability may include 1 to 20% by weight based on 100% by weight of the total skin layer. If the content of the surfactant is less than 1% by weight, the antistatic effect is insignificant, and if it contains 20% by weight, the luminance may be lowered.

According to another preferred embodiment of the present invention, at least one surface of the skin layer An adhesive layer may be formed and formed on the protective film on the adhesive layer.

Specifically, Figure 4b is a cross-sectional view of a reflective polarizer including a protective film according to an embodiment of the present invention. In the reflective polarizer 30 including the protective film, an adhesive layer 32 is formed on at least one surface of the multilayer reflective polarizer 31, and a protective film 33 is formed on the adhesive layer.

First, the adhesive layer that can be used in the present invention will be described. The adhesive layer that can be used in the present invention can be used without limitation as long as it can be used for the adhesion of the optical film, preferably may include a copolymer, an antistatic agent, a crosslinking agent and the like.

The copolymer which is a main component of the pressure-sensitive adhesive can be used conventionally, for example, nitrogen, oxygen, or halogen-containing monomers may be used alone or in combination of two or more thereof.

Specifically, examples of the nitrogen-containing monomer include dialkylaminoalkyl (meth) acrylate, N- (meth) acryloylmorpholine, (meth) acrylamide, n-alkyl (meth) acrylamide, N, N'-di Alkyl (meth) acrylamide, phenyl (meth) acrylamide, n-alkoxyalkyl (meth) acrylamide, n-hydroxyalkyl (meth) acrylamide, n- (1-hydroxy-2,2- dialkoxyalkyl ) (Meth) acrylamide, N-vinylpyridine, N-vinylpyrrolidone, or N-vinyl caprolactam, or a combination of two or more kinds thereof. Examples of the oxygen-containing monomer include alkoxydialkylene glycol (meth). Acrylate, alkoxytriethylene glycol (meth) acrylate, phenoxydialkylene glycol (meth) acrylate, phenoxytrialkylene glycol (meth) acrylate, 2-alkoxyalkyl (meth) acrylate or alkylalkoxy (meth) ) Acrylates, halogen-containing Examples of the monomers include halogenated alkyl (meth) acrylates or halogen-substituted hydroxyalkyl (meth) acrylates.

In the above monomers, alkyl may represent alkyl having 1 to 12 carbon atoms, preferably 1 to 8 carbon atoms, for example methyl, ethyl, isopropyl or butyl. In addition, alkoxy may represent alkoxy having 1 to 12 carbon atoms, preferably 1 to 8 carbon atoms, and for example, methoxy, ethoxy, propoxy or butoxy. In addition, halogen may represent fluorine or chlorine, for example.

More specific examples of the nitrogen-containing monomers described above include dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, N-acryloylmodporin, acrylamide, n-methyl (meth) acrylamide, n-ethyl (meth) acrylamide, n-isopropylacrylamide, n-isopropyl (meth) acrylamide, n-butyl (meth) acrylamide, N, N-dimethyl (meth) acrylamide, phenylacrylamide, n-butoxymethylacrylamide, n-isobutoxymethylacrylamide, n-hydroxymethyl (meth) acrylamide, n- (1-hydroxy-2,2-dimethoxyethyl) acrylamide, N-vinyl pyridine , N-vinylpyrrolidone or N-vinyl caprolactam, and the like, specific examples of the oxygen-containing monomer, methoxy diethylene glycol (meth) acrylate, methoxy triethylene glycol (Meth) acrylate, ethoxydiethylene glycol (Meth) acrylate, ethoxy triethylene glycol (meth) acrylate, butoxydiethylene glycol (meth) acrylate, butoxy triethylene glycol (meth) acrylate, phenoxydiethylene glycol Lycol (meth) acrylate, ethoxytriethylene glycol (meth) acrylate, methoxydipropylene glycol (meth) acrylate, 2-ethoxyethyl acrylate, 2-ethoxyethyl (meth) Acrylate, ethyl-3-ethoxy acrylate or methoxyethyl acrylate, and the like, and specific examples of the halogen-containing monomer include 2,2,2-trifluoroethyl acrylate, 2,2,2-tri Fluoroethyl (meth) acrylate, 2,2,3,3-tetrafluoropropylacrylate, 2,2,3,3-tetrafluoropropyl (meth) acrylate or 3-chloro-2-hydroxypropylacrylate Etc., but is not limited thereto. It is not.

Said nitrogen, oxygen, or halogen containing monomer can be used individually or in mixture of 2 or more types.

Next, the adhesive layer 32 includes a surfactant having an antistatic ability therein. As described above, the conductive polymer and / or the metal salt used as the antistatic agent of the conventional optical film may have improved antistatic ability, but luminance and color deviation may occur. Accordingly, the present invention minimizes the occurrence of luminance degradation and color deviation while maximizing the antistatic performance by using a surfactant having an antistatic ability.

Surfactants having antistatic properties usable herein include poly (oxyethylene) alkylamines, poly (oxyethylene) alkylamides, poly (oxyethylene) alkyl ethers, poly (oxyethylene) alkyl phenyl ethers, glycerol fatty acid esters or Nonionic agents such as sorbitan fatty acid esters, anionic agents such as alkylsulfonates, alkyl benzene sulfonates, alkyl sulfates or alkyl phosphates, quaternary ammonium chlorides, quaternary ammonium sulfates or quaternary ammonium nitrates Sex agents or amphoteric agents such as alkylbetaine type, alkylimidazoline type or alkylalanine type can be used. Amphoteric agents such as alkylbetaine type, alkylimidazoline type or alkylalanine type are preferred.

In addition, the amount of the surfactant having an antistatic ability may include 1 to 20% by weight based on 100% by weight of the total adhesive layer. If the content of the surfactant is less than 1% by weight, the antistatic effect is insignificant, and if it contains 20% by weight, the luminance may be lowered.

Next, the adhesive 32 of the present invention may further include a multifunctional crosslinking agent as necessary. The multifunctional crosslinking agent reacts with a carboxyl group, a hydroxyl group, or the like to increase the cohesive force of the adhesive. The polyfunctional crosslinking agent may be an isocyanate compound, an epoxy compound, an aziridine compound, a metal chelate compound, or the like, and particularly preferably an isocyanate crosslinking agent.

The isocyanate compound is a polyol such as toluene diisocyanate, xylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isoform diisocyanate, tetramethyl xylene diisocyanate, naphthalene diisocyanate, or trimethylolpropane thereof. Reactants and the like can be used. The said epoxy compound is ethylene glycol diglycidyl ether, triglycidyl ether, trimethylol propane triglycidyl ether, N, N, N ', N'- tetraglycidyl ethylenediamine, or glycerin diglycidyl ether, etc. Can be used. The aziridine-based compound is N, N'-toluene-2,4-bis (1-aziridinecarboxide), N, N'-diphenylmethane-4,4'-bis (1-aziridinecarboxide) ), Triethylene melamine, or tri-1-aziridinylphosphine oxide. The metal chelate compound may be a compound in which a polyvalent metal such as aluminum, iron, zinc, tin, titanium, antimony, magnesium, or vanadium is coordinated with acetylacetone or ethyl acetoacetate. Such a multifunctional crosslinking agent may be uniformly coated only when the functional group crosslinking reaction of the crosslinking agent is hardly generated in the compounding process for forming the adhesive layer. After the coating operation is completed and the drying and aging process to form a cross-linked structure can be obtained an adhesive layer having a strong and cohesive strength. At this time, the strong cohesive force of the pressure-sensitive adhesive improves the adhesive properties such as durability and cutting properties of the pressure-sensitive adhesive product.

The multifunctional crosslinking agent as described above is preferably included in 0.01 to 10% by weight relative to 100% by weight of the adhesive layer. When the content is within the above range, the cohesive force of the pressure-sensitive adhesive is excellent, there is no problem in pressure-resistance, such as bubbles or peeling, there is no lifting, etc., there is an effect that the durability is excellent.

The thickness of the pressure-sensitive adhesive layer of the present invention may be preferably 1 ~ 100㎛.

Next, the protective film 33 of the present invention will be described. The protective film 33 used in the present invention is intended to protect the multilayer reflective polarizer 31 from external impacts and the like, and can be used without limitation as long as it can be generally used in the protective film of the optical film. Sterter, PET, TAC, polypropylene and the like can be used. The thickness of the protective film may be preferably 10 ~ 1000㎛.

According to another embodiment of the present invention, the inorganic fine particles may be colloidal particles. The colloidal particles may be colloidal silica in order to improve antistatic properties, scratch resistance, and sparkling. In general, when the organic silicate having four alkyl groups is cured, a glass-like -SiO- bond is formed through the intermediate to have an inorganic property. In this case, the reaction is performed in advance, not as a perfect polymer, but as a precursor. This is called colloidal silica. This compound is not completely crosslinked like glass and the reaction is moderately stopped by external conditions. On the other hand, when the colloidal fine particles are included in the skin layer (particularly the surface layer), antistatic property, scratch resistance improvement and glitter phenomenon may be simultaneously improved. Therefore, in the related art, various objects can be achieved at a time as compared with the case of coating bead particles for improving scratch resistance and adding an additional antistatic agent to improve antistatic properties. The colloidal fine particles may be colloidal silica having an average diameter of 1 to 200 nm in order to reduce glitter.

In addition, according to a preferred embodiment of the present invention, the colloidal fine particles contained in the skin layer may be included 0.1 to 5% by weight based on 100% by weight of the skin layer.

According to another preferred embodiment of the present invention, the inorganic fine particles may include 0.1 to 5% by weight of silica particles having an average particle diameter of 1 to 5㎛ to improve scratch resistance.

According to another preferred embodiment of the present invention, the inorganic fine particles may be UV-resistant. Typically, the spectral distribution of the light source used in the backlight display has several peaks in the ultraviolet (UV) region of the spectrum (less than about 400 nm). For example, most cold cathode fluorescent lamps (CCFLs) emit some energy with weak near ultraviolet as well as 313 and 365 nm mercury lines. Aromatic polycarbonates are particularly sensitive to wavelengths smaller than 350 nm. To prevent denaturation and discoloration of the film used in the backlight display, the polycarbonate must be protected from UV light. Transparent films should not be protected by preventing the transmission of visible light. One or more techniques can be used to protect transparent products. These techniques include applying a coating layer of UV stable materials and bulk adding additives such as UV absorbers (UVAs), quenchers or antioxidants. For thin parts, the addition of UV additives in bulk is a very efficient method. In a preferred embodiment of the invention, the skin layer is

0.01 to 10% by weight, preferably 0.05 to 5% by weight of UV resistant agent may be included. In order to prevent evaporation through the large surface area of the film during the processing process, the UV resistant agent is preferably low volatility, preferably higher than 240 ° C., more preferably higher than 300 ° C. and most preferably 350 ° C. At a higher temperature has a weight loss of 10%. To reduce the effect on brightness, the UV resistant agent should have a minimum absorbance in the spectral visible region, preferably with a cut off wavelength of less than 400 nm, more preferably less than 380 nm. The UV resistant agent is preferably selected from the group consisting of hydroxybenzophenone, hydroxyphenyl benzotriazole, cyanoacrylate, oxanilide, hydroxyphenyl triazine and benzoxazinone. More preferably, the UV resistant agent may be selected from the group consisting of hydroxyphenyl benzotriazole and benzoxazinone, having very low absorbance in visible color and slightly yellow.

6 is a cross-sectional view of a reflective polarizer according to another exemplary embodiment of the present invention. Referring to the difference from FIG. 5, three groups A, B, and C having different average optical thicknesses are formed inside the core layer, and the maximum value of the distance between the plate-shaped polymers within the groups A, B, and C is formed. This may be less than the maximum value of the interpolymer distance between groups A, B and C.

7 is a cross-sectional view of a reflective polarizer according to another preferred embodiment of the present invention. Specifically, the core layer is formed of four groups, and each of the groups can be adjusted in the average optical thickness to cover the light wavelength band of 350 nm, 450 nm, 550 nm and 650 nm, respectively. In this case, the outer layer of the core layer is formed with groups having a large average optical thickness, and groups having a small average optical thickness in the inner layer can be formed. Meanwhile, in order to cover the entire visible light region, the average optical thickness of the polymers must be determined to correspond to various light wavelengths. To set the average optical thickness of the first component of each group within the core layer to correspond to the optical wavelength bands of 350 nm, 450 nm, 550 nm and 650 nm, the average optical thickness of the polymers between the groups may differ by at least 5% or more. More preferably, it may differ by 10% or more. This allows reflection of the S wave in the entire visible region.

On the other hand, the area of the plate-like polymers within a certain area within the same group may be larger than the area of the plate-like polymers within a certain area between the groups. Specifically, the density of the polymers in a certain area S ₁ inside the group A and the certain area S ₂ inside the group B is larger than a certain area S ₃ between the group A and the group B. In other words, the area occupied by the (쨉 m ² ) plate-shaped polymer within the same group is larger than the area occupied by the plate-shaped polymer per unit area (쨉 m ² ) between the group and the group.

8 is a perspective view of a reflective polarizer according to an exemplary embodiment of the present invention, in which a plurality of plate-like polymers 211 are elongated in the longitudinal direction and the cross-section is plate-shaped in the second component 210. In this case, each of the plate-like polymers 211 can be elongated in various directions, but it is preferable to elongate them in parallel in any one direction, more preferably, in a direction perpendicular to the light irradiated from the external light source, Is effective in maximizing the light modulation effect.

According to one preferred embodiment of the present invention, an aspect ratio whose vertical cross section in the longitudinal direction of the plate-shaped polymer is a short axis length with respect to a long axis length may be 1/1000 or less. 9 is a vertical cross section in the longitudinal direction of a plate-like polymer that can be used in the present invention, wherein the ratio of the relative length of the major axis length (a) and the minor axis length (b) when the major axis length is a and the minor axis length is b (aspect ratio) ) Should be less than 1/1000. In other words, when the long axis length (a) is 1000, the short axis length (b) should be less than or equal to 1, which is 1/1000. If the ratio of the short axis length to the long axis length is larger than 1/1000, it is difficult to achieve the desired optical properties. The aspect ratio can be appropriately adjusted through the induction and stretching of the first component in the above-described manufacturing step. On the other hand, although the cross section of the polymer is shown as the ratio of the minor axis length to the major axis length of the present invention is larger than 1/1000, this is only a problem of the method expressed in the drawings for the sake of understanding, The long axis direction is longer and the shorter axis direction is shorter than that of the polymer.

More specifically, in the case of a display having a size of 1580 mm and a height of 400 μm based on a vertical section of the reflective polarizer based on a 32-inch standard display, a conventional reflective polarizer should contain more than 100 million birefringent polymers to achieve desired optical properties. In contrast, the reflective polarizer of the present invention can achieve an optical property that the transmittance of the reflective polarizer in the transmission axis direction is 90% or more and the transmittance in the reflective axis direction is 30% or less even when the number of the plate- More preferably, the optical transmittance in the transmission axis direction is not less than 87% and the transmittance in the reflection axis direction is not more than 10%, and most preferably, the transmittance transmittance is not less than 85% The transmittance may be 7% or less. In this case, preferably, the reflection type polarizer of the present invention may contain not more than 500,000 of the above-mentioned plate-like polymer, and most preferably not more than 300,000 of the above-mentioned plate-like polymer. To this end, according to a preferred embodiment of the present invention, the ratio of the short axis length to the long axis length of the polymer is preferably 1/1000 or less, more preferably 1/1500 or less, even more preferably 1/2000 or less, further Preferably less than 1/3000, more preferably less than 1/5000, more preferably less than 1/10000 or less than 1/20000, more preferably less than 1/30000, more preferably less than 1/50000, most Preferably, it may be 1/70000 to 1/170000.

As a result, the smaller the ratio of the minor axis length to the major axis length is, the more desirable the desired optical properties can be attained even if a smaller number of the plate-like polymer is contained in the substrate.

However, when the aspect ratio of the plate-like polymer becomes very small, the spacing space between the plate-like plane forming polymers forming the same layer can be extremely small. However, in the reflection type polarizer of the present invention, at least one spacing space necessarily exists between the plate-like polymers forming the same layer.

According to a preferred embodiment of the present invention, the reflective polarizer comprises a plurality of plate-shaped polymers satisfying the above-mentioned aspect ratio condition among all the plate-like polymers contained in the substrate, , Preferably not less than 60%, more preferably not less than 70%, more preferably not less than 80%, and most preferably not less than 90%.

According to a preferred embodiment of the present invention, a birefringent interface may be formed between the plate-like polymer (first component) and the substrate (second component) forming the core layer. Specifically, in a reflection type polarizing element including a polymer in a substrate, the magnitude of the substantial agreement or inconsistency of the refractive index along the X, Y, and Z axes in space between the substrate and the plate-like polymer depends on the scattering degree of the polarized light ray along the axis . Generally, the scattering ability changes in proportion to the square of the refractive index mismatch. Thus, the greater the degree of discrepancy in refractive index along a particular axis, the more scattered light rays are polarized along that axis. Conversely, when the inconsistency along a particular axis is small, the polarized light rays along the axis are scattered to a lesser degree. If the refractive index of the substrate along an axis is substantially coincident with the refractive index of the sheet-like polymer, the incident light polarized with an electric field parallel to this axis will pass through the polymer without scattering, regardless of the size, shape and density of the portion of the polymer . Also, when the refractive index along the axis is substantially coincident, the light rays pass through the object without being substantially scattered. More specifically, the first polarized light (P wave) is transmitted without being influenced by the birefringent interface formed at the interface between the base and the polymer, while the second polarized light (S wave) is transmitted through the birefringent interface Modulation of light is affected by this effect. As a result, the P wave is transmitted and the S wave is modulated by light such as scattering and reflection of light, resulting in separation of polarized light.

Therefore, when the substrate is optically isotropic, the plate-like polymer may have birefringence, and conversely, when the substrate is optically birefringent, the plate-like polymer may have birefringence The polymer may have optical isotropy. Specifically, when the refractive index of the polymer in the x-axis direction is nX1, the refractive index in the y-axis direction is nY1, the refractive index in the z-axis direction is nZ1, and the refractive index of the base is nX2, nY2 and nZ2, Can occur. More preferably, at least one of the X, Y, and Z axis refractive indexes of the substrate and the polymer may be different, and more preferably, when the elongation axis is the X axis, the difference in refractive index between the Y axis and the Z axis direction is 0.05 or less , And the difference in refractive index with respect to the X-axis direction may be 0.1 or more. On the other hand, when the difference in the refractive index is 0.05 or less, it is interpreted as matching.

According to a preferred embodiment of the present invention, the total number of layers of the plate-like polymer may be 50 to 3000, the number of the plate-like polymers forming one layer is 30 to 1,000, Lt; / RTI > And the separation distance between adjacent plate-like polymers forming one layer may be at most 0.01 to 1.0 mu m. In addition, the short axis length of the vertical cross section of the plate-like polymer in the longitudinal direction may be 0.01 to 1.0 탆, and the long axis length of the vertical cross section of the elongate in the length direction may be 100 to 17,000 탆. Meanwhile, the layer spacing, the number of layers, the spacing distance, the short axis length, etc. of the present invention can be appropriately adjusted according to the aspect ratio and the desired wavelength of light of the present invention.

Meanwhile, in the present invention, the thickness of the core layer is 20 to 180 μm, and the thickness of the skin layer may be 50 to 300 μm, but is not limited thereto.

Next, the manufacturing method of the reflective polarizer in which the polymer of this invention is disperse | distributed is demonstrated.

First, in step (1), the first component, the second component, and the skin layer component are supplied to the extruding portions, respectively. The first component may be used without limitation as long as the polymer is dispersed in the second component forming the substrate and used in a reflective polarizer in which a conventional polymer is dispersed. Preferably, polyethylene naphthalate (PEN), copolyethylene, Phthalate (co-PEN), Polyethylene terephthalate (PET), Polycarbonate (PC), Polycarbonate (PC) alloy, Polystyrene (PS), Heat-resistant polystyrene (PS), Polymethylmethacrylate (PMMA), Polybutyl Rent Terephthalate (PBT), Polypropylene (PP), Polyethylene (PE), Acrylonitrile Butadiene Styrene (ABS), Polyurethane (PU), Polyimide (PI), Polyvinyl Chloride (PVC), Styrene Acrylic Nitrile Blend (SAN), Ethylene Vinyl Acetate (EVA), Polyamide (PA), Polyacetal (POM), Phenolic, Epoxy (EP), Urea (UF), Melanin (MF), Unsaturated Polyester (UP), Silicone (SI) and cycloolefin polymers are used Number and may be more preferably PEN.

The second component may be used without limitation as long as the second component is used as a material of the substrate in the reflective polarizer in which the polymer is dispersed, and preferably, polyethylene naphthalate (PEN) or copolyethylene naphthalate (co-PEN). ), Polyethylene terephthalate (PET), polycarbonate (PC), polycarbonate (PC) alloy, polystyrene (PS), heat-resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT) ), Polypropylene (PP), polyethylene (PE), acrylonitrile butadiene styrene (ABS), polyurethane (PU), polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN) Ethylene vinyl acetate (EVA), polyamide (PA), polyacetal (POM), phenol, epoxy (EP), urea (UF), melanin (MF), unsaturated polyester (UP), silicone (SI) and cyclic Alone or mixed with a low-olefin polymer Can be used and may be more preferably, dimethyl 2,6-naphthalenedicarboxylate, dimethyl terephthalate and ethylene glycol, Im chroman-hexane dimethanol (CHDM), such as the monomers are suitably polymerized co-PEN.

The skin layer component may be used without limitation as long as it is typically used in a reflective polarizer in which a polymer is dispersed, and preferably, polyethylene terephthalate (PET), polycarbonate (PC), polycarbonate (PC) alloy, and polystyrene (PS). ), Heat-resistant polystyrene (PS), polymethyl methacrylate (PMMA), polybutylene terephthalate (PBT), polypropylene (PP), polyethylene (PE), acrylonitrile butadiene styrene (ABS), polyurethane (PU) ), Polyimide (PI), polyvinyl chloride (PVC), styrene acrylonitrile mixture (SAN), ethylene vinyl acetate (EVA), polyamide (PA), polyacetal (POM), phenol, epoxy (EP) , Urea (UF), melanin (MF), unsaturated polyester (UP), silicone (SI) and cycloolefin polymers can be used. The polycarbonate alloy is preferably made of a polycarbonate and a modified glycol polycyclohexylene dimethylene terephthalate (PCTG), more preferably a polycarbonate and a modified glycol polycyclohexane (PCTG) may be a polycarbonate alloy having a weight ratio of 5:95 to 95: 5. In the meantime, the skin layer of the present invention is preferably made of a material having a small change in refractive index in the spreading and stretching process, more preferably polycarbonate or polycarbonate glass.

On the other hand, the present invention includes a surfactant having the above-described antistatic ability as a skin layer component, in this case it can be added to the surfactant to be 3 to 20% by weight relative to the total skin layer components.

Meanwhile, the first component, the second component, and the skin layer component may be separately supplied to the independent extrusion units. In this case, the extrusion unit may be composed of three or more. It is also included in the present invention to feed one extruded portion including a separate supply path and a distribution port so that the polymers do not mix. The extruder may be an extruder, which may further include a heating means or the like to convert the supplied polymers in the solid phase into a liquid phase.

Next, (2) two or more sea-island complex streams in which a plurality of first components are dispersed in the second component are formed, and in order to reflect a transverse wave (S wave) of a desired wavelength, The first component and the second component transferred from the extrusion portion are introduced into a plurality of seawater extrusion orifices to form two or more sea-island composite streams having different first optical components of the first components. 10 and 11 are perspective views showing the coupling structure of the distribution plate of the island-in-the-sea extrusion mold which can be used in the present invention. The first pickling distribution plate S1 located at the upper end of the sea-island extrusion port can be constituted by the first component supply path 50 and the second component supply path 51 therein. So that the first component transferred through the extrusion portion can be supplied to the first component supply path 50 and the second component can be supplied to the second supply path 51. A plurality of such supply paths may be formed as the case may be. Polymers that have passed through the first receiving distribution plate S1 are transported to the second receiving distribution plate S2 located below. The first component injected through the first component supply path 50 is branched and transferred to the plurality of first component supply paths 52 and 53 along the flow path. In addition, the second component injected through the second component supply path (51) is branched and transferred to the plurality of second component supply paths (54, 55, 56) along the flow path. The polymers passing through the second separating distribution plate S2 are transported to the third separating distribution plate S3 located below. The first components injected through the first component supply paths 52 and 53 are branched along the flow path to the first component supply paths 59, 60, 63 and 64 formed in the third pickling distribution plate S3 Lt; / RTI > Likewise, the second components injected through the second component supply paths 54, 55 and 56 are respectively supplied to the second component supply paths 57, 58, 61, 62, 65, 66 ) Along the flow path. The polymers that have passed through the third separation distribution plate S3 are transferred to the fourth separation distribution plate S4 located below. The first components injected through the first component supply paths 59, 60, 63 and 64 are respectively spread over the first component supply paths 69 formed in the fourth separate distribution plate S4, The second component introduced through the component supply paths 57, 58, 61, 62, 65 and 66 is connected to the second component supply passages 67 and 68 formed at the upper and lower ends of the first component supply passages 69 along the flow path. ). At this time, the number of layers of the first component included in the sea-island complex flow is determined by the number of vertical layers (n) of the first component supply paths 69. For example, when the number of longitudinal direction layers is 50, the number of layers of the first component included in the first isolar compound current is 50. [ The number of component layers in the fourth corrugated distribution plate S4 may be at least 25, more preferably at least 50, more preferably at least 100, and most preferably at least 150. Thereafter, in the fifth separating plate S5, the first component seeps between the dispersed first components to form a sea-island complex stream in which the first component is dispersed in the second component, and then the sea- And discharged through the discharge port 70 of the sixth housing distribution plate S6. Meanwhile, FIGS. 10 and 11 are examples of island-in-the-sea detention distribution plates that may be used in the present invention, and the number, structure, and detention of detention distribution plates for manufacturing island-in-the-sea composites in which the first component is dispersed in the second component. It is obvious to those skilled in the art to appropriately design and use the size, shape and the like of the holes. Preferably, the diameter of the through-hole of the isometric-supply path may be 0.17 to 5 mm, but is not limited thereto.

On the other hand, as the number of layers of the island component supply passage in the fourth mold distribution plate increases, a degree of conduction between the island components (first component) may occur. In order to prevent this, the island component supply passage may be partitioned as shown in FIG. 12, and the sea component supply passages 71 and 72 may be formed on the partition passage so that the sea component may penetrate smoothly between the island components. As a result, even if the number of layers in the island component supply path increases, the degree of conduction between the island components (the first component) included in the final substrate may be minimized. On the other hand, it is also possible to form a separate island-in-the-sea composite composite flow path, which is interpreted as a plurality of integrated island-in-the-sea extrusion molds. As a result, the present invention includes not only a plurality of islands-in-the-sea extrusion molds, but also ones that are integrally formed to produce a plurality of islands-in-sea composites.

In addition, in FIG. 10, the arrangement of the island component supply paths of the fourth mold distribution plate may be arranged in a straight line as shown in FIG. 13. However, in order to minimize the bonding and to further disperse the island components in the substrate, FIGS. Likewise, the island component supply path can be arranged in a zigzag type.

 Specifically, Figures 15 and 16 is a view of the detention of the island-in-the-sea extrusion mold according to a preferred embodiment of the present invention. Specifically, there are six detention distribution plates of the island-in-the-sea reflective reflector, which are different from the detention distribution plate of FIG. 10 in the fourth detention distribution plate T4 and the fifth detention distribution plate T5. Referring to the difference from FIG. 10, the fourth detention distribution plate T4 of FIG. 15 includes a second component supply passage between the first component supply passage aggregation units 100, 101, and 102 similarly to FIG. 12. It is divided into a flow path. Thereby allowing the second component to evenly penetrate between the first components.

On the other hand, it is also possible to form a plurality of islands-in-the-sea composite flow through the fourth detention distribution plate (T4) and the fifth detention distribution plate (T5) of FIG. In other words, a separate sea-island complex flow is formed through the partitioned distribution ducts 100, 101, 102 of the fourth separation distribution plate T4 and three sea-like complex flows are formed in the interior After that, you can join together again. For this purpose, the design and modification of a separate distribution plate is obvious to a person skilled in the art, and is included in a plurality of integrated seawater extrusion apparatuses.

In the present invention, a plurality of sea-island complex streams including the first component dispersed in the second component are formed, and preferably the number of the sea-island complex streams is two or more, more preferably three or more , More preferably four or more. To this end, as shown in FIG. 17, a plurality of island-in-the-sea extrusion molds capable of forming respective islands-in-sea composite composites may be provided, and a plurality of islands-in-sea extrusion molds may be integrally formed. In this case, it is also possible to form the sea water supply path in a redundant manner, preferably between adjacent pushing-out ports.

It is also obvious to those skilled in the art that the sea-island extrusion orifices are individually or integrally arranged to form a plurality of sea-island complex streams, and that the number and structure of the appropriately distributed distribution plates are appropriately designed and arranged. For example, when four sea-island extrusion ports are integrally formed to form four sea-island complex streams, the first detachable distribution plate may be manufactured as four as the number of the fourth detachable distribution plates, And it is also possible to supply them in a branched manner to the four interrupted distribution distribution boards.

On the other hand, in order to cover different wavelength ranges of the light, the plurality of sea-island complex streams have optical thicknesses of the first component, the optical thickness of the second component, the number of layers of the first component, Can be different. For this purpose, the diameter, cross-sectional area, shape, and / or number of layers of the isotonic powder feed path and / or the seawater feed path formed in the respective seawater extrusion orifices may be different. This is because a plurality of groups are formed in the reflection type polarizer manufactured through the spreading and stretching process, and the plurality of groups have different average optical thicknesses. For this purpose, considering the spreading degree of the first components, The diameters of the above-described supply paths can be determined.

As described above, optical thickness means n (refractive index) x d (physical thickness). Therefore, if two sea-island complex streams are formed, the optical thickness is proportional to the physical thickness (d) if the first component in the sea-island complex stream is the same. Therefore, it is possible to derive the difference in optical thickness between the sea-island complex streams by varying the average value of the physical thickness (d) of the first component and / or the second component included in each sea-island complex stream. On the other hand, in order to cover the entire visible light region, the average optical thickness of the sea-island complex currents should be determined so as to correspond to various light wavelengths. For example, in order to set the average optical thickness of the first component of the sea-island complex type so as to correspond to 450 nm, 550 nm, and 650 nm of the wavelength range of each light, May be different by at least 5% or more, and more preferably by 10% or more. This allows reflection of the S wave in the entire visible region.

 In addition, the diameter, cross-sectional area, shape, and the like of the island component supply path and / or the sea component supply path may be the same or different in a sea-island extrusion port forming a single sea-type complex flow. Furthermore, the optical thicknesses of the first components forming the same sea-island complex stream may have a deviation of preferably within 20%, more preferably within 15% of the average optical thickness. For example, if the average optical thickness of the first components of the first sea current type complex stream is 100 nm, then the first components forming the same first sea current type complex stream have an optical thickness variation within about 20% . On the other hand, the wavelength of light and the optical thickness are defined by the following relational expression (1).

[Relation 1]

λ = 4nd

Where? Is the wavelength of light (nm), n is the refractive index, d is the physical thickness (nm)

Therefore, when the optical thickness (nd) deviates, it is possible to cover not only the wavelength of the target light but also the wavelength range of the light including the target, thereby greatly improving uniform optical properties. The deviation of the optical thickness described above can be achieved by imparting a deviation to the diameter, the cross-sectional area, and the like of the isometric feed path from one seawater extrusion or, if the feed path has the same diameter, the natural fine pressure distribution And the difference between them can be achieved naturally.

According to another preferred embodiment of the present invention, the first component transferred in the extruding part between steps (1) and (2) includes a plurality of particles having different discharge amounts in order to have different average optical thicknesses And then discharged through the first pressurizing means into different seawater extrusion orifices respectively. Specifically, FIG. 18 is a schematic view including a first pressurizing means to form two islands-in-the-sea composite flows, in which a first component conveyed from an extruder (not shown) includes the plurality of first pressurizing means 130 and 131. And supplied separately to the islands-in-the-sea type extrusion holes 132 and 133 in the respective first pressing means 130 and 131. At this time, the first pressurizing means 130 and 131 have discharge amounts different from each other, and through which the respective seawater extrusion / take-out ports 132 and 133 have the same specifications (when the shape diameters of the ingredient supply paths etc. are the same) May have different average optical thicknesses of the first component of the first sea-island-type complex stream and the second sea-island complex stream formed through the first sea-view complex stream. When the first pressurizing means 130, 131 have different discharge amounts, the area of the first composite flow and the first component formed in the second composite flow through the seawater extrusion orifices 132, 133 communicated therewith An area difference occurs due to a different discharge amount, resulting in a difference in optical thickness between the composite streams.

To this end, the discharge amount of the first pressurizing means 130 and 131 may be preferably 1 to 100 kg / hr, but is not limited thereto.

On the other hand, one first pressurizing means feeds the first component to the two seawater-shaped push-out mouths, and two sea-island-type composite streams formed by the two sea-island push- It is also possible that one group is formed. In this case, the final reflection type polarizer may be formed of four groups through four first component pressing means and eight chart type extrusion / detaching mechanisms. It is also possible that one of the first pressing means transports the first component to three or more sea-island extrusion orifices.

According to another preferred embodiment of the present invention, the second component transferred in the extrusion between the step (1) and step (2) comprises a plurality of particles having different discharge amounts in order to have different average optical thicknesses And can be discharged through the second pressurizing means into different seawater extrusion orifices respectively. Specifically, FIG. 19 is a schematic view of including two second pressing means to form two islands-in-the-sea composite flows, in which a second component conveyed from an extruder (not shown) includes the plurality of second pressing means 140, Branched to 141 and supplied separately to the islands-in-the-sea extrusion-type extrusion holes 142 and 143 in respective second pressurizing means 140 and 141. At this time, the second pressurizing means 140 and 141 have different discharge amounts, and through which the respective seawater extrusion orifices 142 and 143 have the same specifications (when the shape diameters of the ingredient supply paths etc. are the same) The average optical thickness or the thickness of the base material (core layer) of the second component of the first sea-island type complex stream and the second sea-view complex stream formed through the first sea-island complex stream may differ. For this, the discharge amount of the second pressurizing means 140 and 141 may be preferably 1 to 100 kg / hr, but is not limited thereto.

On the other hand, one second pressurizing means feeds the second component to the two seawater-shaped push-out mouths, and two sea-island composite streams formed by the two sea-island push-out seams are joined together to form a single sea- It is also possible that one group is formed. In this case, the final reflection type polarizer may be formed of four groups through four second component pressing means and eight chart type extrusion / detaching mechanisms. It is also possible that one second pressing means transports the second component to three or more sea-island extrusion orifices.

According to another preferred embodiment of the present invention, between the steps (1) and (2), the second component transferred from the extruding unit is discharged through the second pressurizing unit into the different seawater extrusion orifices . 20 is a schematic view including one second pressurizing means for forming two islands-in-the-sea composite flows, in which a second component conveyed from an extruder (not shown) is supplied to the second pressurizing means 150 and The plurality of islands-in-the-sea extrusion molds 151 and 152 are separately supplied. The average optical thickness of the second component of the first sea-island type complex stream and the second sea-type complex stream formed through the first sea-view complex stream and the thickness of the base material (core layer) may be the same. In this case, It is possible to arrange them in a plurality so that the average optical thicknesses of the first components included in the respective sea-island complex streams are different from each other.

In the next step (3), the two or more sea-island complex streams are combined to form a core layer. Specifically, FIG. 21 is a schematic view showing the lamination portion of the island-in-the-sea composites, and the core layer 165 by laminating the plurality of island-in-the-sea composites 161, 162, 163, and 164 manufactured through each island-in-the-sea extrusion mold. ) To form. On the other hand, the lapping step may be performed in a separate place, or in the case of using an integral type seaweed extrusion apparatus, it may be joined together through a separate collecting / distributing distribution plate. In addition, when the number of sea-island complex streams is large, it is also possible to perform a multi-stage sea-island structure in which some sea-island complex streams are first lapped and lapped again to facilitate linting. Meanwhile, the skin layer component may also be laminated simultaneously or sequentially with the core layer in the lamination portion.

Meanwhile, a separate preliminary spreading step may be further performed between the steps (2) and (3) or between the steps (3) and (4) to facilitate the spreading of the first component .

Next, in step (4), at least one side of the core layer laminated is joined with the skin layer component transferred from the extrusion part. Preferably, the skin layer component may be laminated on both sides of the core layer. When the skin layers are laminated on both sides, the material and the thickness of the skin layer may be the same or different from each other. Meanwhile, as described above, when the skin layer components are simultaneously laminated in the lamination part of step (3), this step may be omitted.

Next, in step (5), the first component of the core layer in which the skin layer is laminated induces spreading in the flow control unit to form a plate-like shape. Specifically, FIG. 22 is a cross-sectional view of a coat-hanger die, which is a kind of preferred flow control unit that may be applied to the present invention, and FIG. 23 is a side view. Accordingly, the degree of spreading of the core layer can be appropriately adjusted so that the vertical cross section of the first component in the longitudinal direction can be adjusted to have a plate-like shape. In FIG. 22, since the core layer in which the skin layer transferred through the flow path is laminated is widely spread from side to side in the coat-hanger die, the first component included therein is also widely spread from side to side. In addition, as shown in the side view of FIG. 23, the coat hanger die spreads from side to side, but has a structure of decreasing vertically, so that the skin layer is spread in the horizontal direction of the laminated core layer or reduced in the thickness direction. This is based on Pascal's principle, in which the fluid in the enclosure is guided to spread widely in the width direction by the principle that the pressure is transmitted to the fine portion by a certain pressure. Therefore, the outlet size is wider in the width direction than the die inlet size, and the thickness is reduced. This requires the use of the Pascal principle in which the molten liquid material can flow and shape controlled by pressure in a closed system, preferably a polymer flow rate and viscosity induction such that a flow of laminar flow of less than 2,500 Reynolds numbers is preferred. When the flow of the turbulent flow is 2,500 or more, the induction of the plate-like type becomes uneven, and there is a possibility that the optical characteristic is varied. The left and right die width of the outlet of the coat-hanger die may be between 800 and 2,500 mm and the fluid flow of the polymer is required to regulate the pressure so that the Reynolds number does not exceed 2,500. The reason is that the polymer flow becomes turbulent and the arrangement of the cores may be disturbed. Also, the internal temperature may be 265 to 310 ° C. On the other hand, the degree of spreading may be influenced by the compatibility of the first component and the second component, and in order to have excellent spreadability, PEN as the first component and CO-PEN as the second component may be used. Further, the degree of spreading can be controlled by appropriately polymerizing monomers constituting CO-PEN, for example, dimethyl-2,6-naphthalene dicarboxylate, dimethyl terephthalate, ethylene glycol and cyclohexane dimethanol (CHDM) have. The flow control part may be a T-die or a manifold type Coat-hanger die so that the first component can form a plate-like shape. However, the present invention is not limited to this, and it is possible to induce the spreading of the core layer to induce the first component into a plate- Anything that can be used can be used without limitation.

On the other hand, the plate-like shape has an aspect ratio of 1/200 or less, 1/300 or less, or 1/500 or less, which is the ratio of the minor axis length to the major axis length, 1/1000 or less, 1/2000 or less, 1/5000 or less, 1/10000 or less, or 1/20000 or less. If the aspect ratio is more than 1/200, it is difficult to achieve the desired optical properties even if the aspect ratio is reduced through the elongation of the polarizer thereafter. In particular, when the aspect ratio of the first component is adjusted by controlling the aspect ratio of the final first component through induction of spreading with an aspect ratio exceeding 1/200 and then by a high draw ratio of 6 times or more, the area of the first component is smaller than the area of the second component, Due to the light leakage phenomenon, there is a problem of deterioration of optical characteristics.

As a result, the smaller the ratio of the minor axis length to the major axis length is, the more desirable the desired optical properties can be attained even if a smaller number of the plate-like polymer is contained in the substrate.

The manufacturing method of the present invention is characterized in that a plurality of sea-island composite streams having different average optical thicknesses of the first component are produced by using a plurality of sea-island extrusion orifices and joined together in a molten state, so that a separate adhesive layer and / . Also, since the skin layer is formed on at least one surface of the core layer in a molten state, the skin layer is not subjected to a separate adhesion step. Thus, the manufacturing cost can be remarkably reduced. In addition, the reflection type polarizer manufactured through the manufacturing method of the present invention has a very small number of birefringent polymers in comparison with the conventional birefringent polymer-containing reflection type polarizer, It is possible not only to achieve extremely excellent optical properties but also to reflect all the S waves in the visible light wavelength region since a plurality of groups having different average optical thicknesses are formed.

According to a preferred embodiment of the present invention, after the step (5), (6) cooling and smoothing the polarizer induced by the spread transferred from the flow control unit, (7) stretching the polarizer after the smoothing step ; And (8) heat setting the stretched polarizer.

First, in step (6), cooling and smoothing of the polarizer transferred from the flow control unit may be performed by cooling used in the manufacture of a conventional reflective polarizer to solidify it, and then may be performed by a casting roll process or the like.

Thereafter, a step of stretching the polarizer through the smoothing step is performed. The stretching may be effected through a conventional process of stretching the reflective polarizer, thereby causing a refractive index difference between the first component and the second component to cause a light modulation phenomenon at the interface, and the spreading induced first component The aspect ratio is further reduced through stretching. Therefore, in order to adjust the optical thickness by deriving the desired aspect ratio of the plate-like first component in the final reflective polarizer, the optical thickness can be appropriately set in consideration of the diameter of the island component supply path, the spreading inducing condition, will be. For this purpose, the uniaxial stretching or biaxial stretching can be preferably performed in the stretching step, and more preferably uniaxial stretching can be performed. In the case of uniaxial stretching, the stretching direction may be performed in the longitudinal direction of the first component. The stretching ratio may be 3 to 12 times. On the other hand, a method of changing an isotropic material to birefringent is commonly known. For example, when stretching under appropriate temperature conditions, polymer molecules may be oriented so that the material becomes birefringent.

Next, the final reflective polarizer may be manufactured by performing heat setting of the stretched polarizer as (8). The thermal fixation may be heat-set through a conventional method, preferably at 180 to 200 ° C for 0.1 to 3 minutes through an IR heater.

On the other hand, in the present invention, if the average optical thickness and aspect ratio to be targeted between groups is determined, the reflective polarizer of the present invention can be manufactured by appropriately controlling the specifications of the island-in-the-sea extrusion mold, the flow control part, the drawing ratio, and the like. It is.

According to a preferred embodiment of the present invention, an apparatus for manufacturing a reflective polarizer in which a polymer is dispersed, comprising a core layer having a plurality of first components dispersed therein and a skin layer formed on at least one surface of the core layer. At least three extrusion parts into which the first component, the second component and the skin layer component are separately put; The extrusion component in which the first component is injected is formed to form a plurality of islands-in-the-sea composites in which the first component is dispersed inside the second component, and each island-in-the-sea composite compound reflects an S wave of a desired wavelength. And a plurality of islands-in-sea type extrusion molds in which two or more islands-in-sea type extrusion molds are formed by injecting the first component and the second component transferred from the extruded part into which the second component is injected to form two or more islands-in-sea composites having different average optical thicknesses of the first components. Block portion; A collection block unit that forms a core layer by combining two or more sea-island complex streams transferred from the spin block unit; A feed block portion in communication with the extruder into which the skin layer component is injected and laminating the skin layer on at least one surface of the core layer transferred from the collection block; And a flow control unit for inducing spreading so that the first component of the core layer on which the skin layer transferred from the feed block unit is laminated forms a plate shape.

24 is a schematic diagram of an apparatus for manufacturing a reflective polarizer in which a polymer is dispersed according to a preferred embodiment of the present invention. Specifically, the first extrusion part 220 to which the first component is injected, the second extrusion part 221 to which the second component is injected, and the third extrusion part 222 to which the skin layer component is injected are included. The first extruding portion 220 is connected to the spin block portion C including four chart type extrusion orifices 223, 224, 225, and 226. At this time, the first extruding unit 220 supplies the first component in the molten state to the four sea-island extrusion orifices 223, 224, 225, and 226. The second extruding portion 221 is also connected to the spin block portion C and supplies the second component to the four marginal type extrusion orifices 223, 224, 225, and 226 contained therein in a molten state. The first component is dispersed inside the second component through the four isometric extrusion ports 223, 224, 225, and 226 to produce four sea-island composite streams having different average optical thicknesses. The four islands-in-the-sea extrusion molds 223, 224, 225, and 226 may be the island-in-the-sea extrusion molds shown in FIG. 10 or 15. In addition, although four seawall-shaped extrusion seams are taken as an example, it is also within the scope of the present invention that an integrated seawater extrusion seam can be used. The four sea-island composite flows produced through the four sea-island extrusion ports 223, 224, 225 and 226 are joined together in the collection block portion 227 to form one core layer. In this case, the collection block unit 227 may be formed separately, or in the case of using a single integrated seawater extrusion orifice, the sea-like composite streams may be joined together in the form of a cantilever in the seawater extrusion orifice. The core layer laminated in the collection block portion 227 is transferred to the feed block portion 228 and then laminated with the skin layer component transferred from the third extrusion portion 222. Therefore, the third extrusion part 222 and the feed block portion 228 may be in communication with each other. Thereafter, the core layer in which the skin layer is laminated is transferred to the flow control unit 229, and the spread of the first component is induced to form a plate shape. Preferably, the flow control may be a T-die or a coat-hanger die. On the other hand, when the skin layer is laminated with the core layer at the same time, the third extruded portion 222 may be in communication with the collection block portion 227, in which case the feed block portion 228 may be omitted.

25 is a schematic diagram of an apparatus for manufacturing a reflective polarizer in which a polymer is dispersed according to another exemplary embodiment of the present invention. 24, the first extrusion part 220 transfers the first component to the four first pressing means 233, 234, 235, and 236. The first pressurizing means 233, 234, 235, and 236 have different discharge amounts, and discharge the first component to the plurality of island-in-the-sea type extrusion holes 241, 242, 243, and 244. The second extruding portion 221 feeds the second component to the four second pressing means 237, 238, 239, 240. The second pressurizing means 237, 238, 239, and 240 have different discharge amounts and discharge the second component into the plurality of island-in-the-sea type extrusion holes 241, 242, 243, and 244. On the other hand, there is only one second pressurizing means and it is also possible to discharge it to the plurality of islands-type extrusion mold (241, 242, 243, 244). Four islands-in-the-sea extrusion molds 241, 242, 243, and 244 produce four islands-in-the-sea composites with the first component dispersed within the second component and having different average optical thicknesses. The first pressing means, the second pressing means, and the plurality of island-in-the-sea extrusion molds form the spin block portion C.

26 is a schematic diagram of an apparatus for manufacturing a reflective polarizer in which a polymer is dispersed according to another preferred embodiment of the present invention. 25, the present invention is characterized in that, in order to manufacture a reflective polarizer having four groups, eight sea-island extrusion nozzles are used instead of four sea-island extrusion nozzles, and multi-stage laminating is performed. Specifically, the first pressing means 233 discharges the first component to the two seawater-shaped pushing-out portions 250, 251. The second pressurizing means 234 also discharges the first component to the two chart type extrusion orifices 250, 251. Since the first component and the second component are transferred through the same first pressurizing means and the second pressurizing means, the two isometric extrusion ports 250 and 251 have the same average optical thickness between the sea-island composite streams. In this way, eight sea-island complex streams are formed and the average optical thicknesses of the two sea-island complex streams are equal to each other. The two chart-type mixed streams having the same average optical thickness are laminated in the first leg portions 258, 259, 260, and 261 to form four sea-view composite streams, and the four sea- And a single core layer is formed by joining together in the branch portion 262. [

Meanwhile, in FIG. 26, one first pressing means transfers the first component to the two islands-in-the-sea extrusion molds, but it is apparent to those skilled in the art that the first component can be transferred to the two or more islands-in-sea extrusion molds. The same may be applied to the second pressing means.

Specifically, FIG. 27 is an example of a reflective polarizer in which a polymer employing the reflective polarizer of the present invention is dispersed, and a reflecting plate 280 is inserted into a frame 270, and cold cathode fluorescent light is disposed on an upper surface of the reflecting plate 280. Lamp 290 is located. An optical film 320 is disposed on the upper surface of the cold cathode fluorescent lamp 290. The optical film 320 includes a diffusion plate 321, a light diffusion film 322, a prism film 323, a reflection type polarizer 324 and the absorption polarizing film 325 are stacked in this order, but the order of lamination may be changed depending on the purpose, or a part of the constituent elements may be omitted or a plurality of them may be provided. For example, the diffusion plate 321, the light diffusion film 322, the prism film 323, and the like may be omitted from the overall configuration and may be changed in order or formed at different positions. Further, a phase difference film (not shown) or the like can also be inserted at an appropriate position in the liquid crystal display device. Meanwhile, the liquid crystal display panel 310 may be positioned on the upper surface of the optical film 320 by being inserted into the mold frame 300.

The light emitted from the cold cathode fluorescent lamp 290 reaches the diffuser plate 321 of the optical film 320. The light transmitted through the diffusion plate 321 passes through the light diffusion film 322 in order to advance the proceeding direction of the light perpendicularly to the optical film 320. The film having passed through the light diffusion film 322 reaches the reflection type polarizer 324 after passing through the prism film 323, thereby causing light modulation. Specifically, the P wave passes through the reflection type polarizer 324 without loss, but light modulation (reflection, scattering, refraction, etc.) occurs in the case of the S wave and is reflected again by the reflection plate 280, which is the back surface of the cold cathode fluorescent lamp 290 And the properties of the light are randomly changed into a P wave or an S wave, and then pass through the reflective polarizer 324 again. And then reaches the liquid crystal display panel 310 after passing through the absorption polarizing film 325. [ As a result, when the reflective polarizer of the present invention is inserted into a liquid crystal display device due to the above-described principle, remarkable improvement in luminance can be expected as compared with a general reflective polarizer. Meanwhile, the cold cathode fluorescent lamp 290 may be replaced with an LED.

In the present invention, the use of the reflective polarizer has been described based on the liquid crystal display, but the present invention is not limited thereto, and may be widely used in flat panel display technologies such as a projection display, a plasma display, a field emission display, and an electroluminescent display.

On the other hand, for the specific configuration and effects of the reflective polarizer in which the polymer is dispersed, the contents of Korean Patent Application Nos. 2011-0145746 and 2011-0145746 are incorporated by reference.

≪ Example 1 >

The process was performed as shown in FIG. Specifically, PEN having a refractive index of 1.65 as a first component and dimethyl terephthalate and dimethyl-2,6-naphthalene dicarboxylate as a second component in a molar ratio of 6: 4 are mixed with ethylene glycol (EG) and 1. : Refractive index polymerized to 90% by weight of polycarbonate and polycyclohexylene dimethylene terephthalate (PCTG) as a co-PEN and skin layer component having a refractive index of 1.64 reacted at a molar ratio of 2 90% by weight of polycarbonate alloy of 1.58 and 10% by weight of quaternary ammonium sulfate as the cationic surfactant were added to the first, second and third extrusion portions, respectively. The extrusion temperature of the first component and the second component was 295 ° C. and the Cap.Rheometer was confirmed to correct the polymer flow through IV adjustment. The skin layer was subjected to the extrusion process at a temperature level of 280 ° C. The first component was transferred to four first pressing means (Kawasaki gear pump) and the second component was also transferred to four second pressing means (Kawasaki gear pump). The discharge amounts of the first and second pressurizing means are 10.5 kg / h, 5.3 kg / h, 6.9 kg / h and 8.9 kg / , 6.9 kg / h, and 8.9 kg / h. Four composites having different average optical thicknesses were prepared using four island-in-the-sea extrusion molds as shown in FIG. 15. Specifically, the first component transferred from the first pressurizing means and the first component transferred from the second pressing means were introduced into the first isostatic pressing apparatus to produce the first composite flow. The fourth composite stream was prepared in this order. The number of layers of the fourth component distribution plate (T4) in the first to fourth isosceles extrusion ports is 96, the diameter of the hole of the component supply channel is 0.17 mm, and the number of the four component supply channels is Respectively. The diameter of the discharge port of the sixth prismatic distribution plate was 15 mm x 15 mm. The seabed extrusion detention uses the same detention. Four composites discharged through the four islands-in-the-sea extrusion molds were transferred through separate flow paths and then laminated in a collection block to form one core layer polymer. In the feed block having a three-layer structure, a skin layer component flowed through the flow path from the third extrusion part to form a skin layer on the upper and lower surfaces of the core layer polymer. The skin layer is formed such that the aspect ratio of the first composite flow is 1/13500, the aspect ratio of the second composite flow is 1/25000, and the aspect ratio of the third composite flow is 1/19500, and the aspect ratio of the fourth composite flow is 1/15900. The layered polymer was induced to spread in the coat hanger die of FIGS. 21 and 22 to correct for flow velocity and pressure gradient. Specifically, the width of the die inlet is 200 mm, the thickness is 20 mm, the width of the die outlet is 960 mm, the thickness is 2.4 mm, The flow rate is 1 m / min. Then, a smoothing process was performed on the cooling and casting rolls and stretched 6 times in the MD direction. As a result, the major axis length of the first component was not changed but the minor axis length was decreased. Thereafter, heat setting was performed through an IR heater at 180 ° C. for 2 minutes to prepare a reflective polarizer in which the polymer as shown in FIG. 7 was dispersed. The refractive index (nx: 1.88, ny: 1.64, nz: 1.64) of the first component of the produced reflective polarizer was 1.64 and the refractive index of the second component was 1.64. The aspect ratio of the A layer was 1/101000, the number of layers was 96, the minor axis length (thickness direction) was 100 nm, the major axis length was 10.1 mm, the average optical thickness was 164 nm, and the optical thickness variation was about 20%. The B layer had an aspect ratio of 1/184000 and a layer number of 96 layers. The minor axis length (thickness direction) was 54.9 nm, the major axis length was 10.1 mm, the average optical thickness was 90 nm, and the optical thickness variation was about 20%. C layer had an aspect ratio of 1/148000 and a number of layers of 96 layers. The minor axis length (thickness direction) was 68.3 nm, the major axis length was 10.1 mm, the average optical thickness was 112 nm, and the optical thickness variation was about 20%. The aspect ratio of the plate of the D layer was 1/120000 and the number of layers was 96 layers. The minor axis length (thickness direction) was 84 nm, the major axis length was 10.1 mm, the average optical thickness was 138 nm, and the optical thickness variation was about 20%. Core layer thickness is 60 micrometers, and skin layer thickness is 170.2 micrometers on upper and lower surfaces.

<Example 2>

A reflective polarizer was prepared in the same manner as in Example 1, except that 0.5 wt% of hydroxyphenyl benzotriazole (Ciba, Tinuvin 234) was further included in the skin layer.

&Lt; Comparative Example 1 &

A reflective polarizer was prepared in the same manner as in Example 1 except that polythiophene, a conductive polymer, was added to the skin layer instead of the quaternary ammonium sulfate.

<Experimental Example>

The following physical properties of the reflective polarizers prepared in Example 1 and Comparative Example 1 were evaluated, and the results are shown in Table 1.

1. Relative luminance

In order to measure the brightness of the produced reflective polarizer, the following procedure was performed. After assembling the panel on the 32 "direct backlight unit equipped with a diffuser plate and a reflective polarizer, the brightness of nine points was measured using Topcon's BM-7 measuring device. Uniformity is shown through the luminance deviation.

The relative luminance shows the relative values of the luminance of the other Example 1 and Comparative Example 1 when the luminance of the reflective polarizer of Example 1 is 100 (reference).

2. It was measured using a surface resistance meter (Monroe Electronics Resistivity Meter Model 272).

3. Color coordinates (CIE)

In order to measure the brightness of the produced reflective polarizer, the following procedure was performed. After assembling the panel on the 32 "direct type backlight unit equipped with a diffuser plate and a reflective polarizer, the color coordinates of 9 points were measured using Topcon's BM-7 measuring instrument, and the average value was shown. The x and y coordinates of the CIE color coordinates are based on 3/1000.

Relative luminance (%) Luminance uniformity Surface resistance (Ω / □) CIE x CIE y Example 1 100 88% E11 - - Example 2 100 88% E11 2/1000 2/1000 Comparative Example 1 90 80% E10 2/100 2/100

As can be seen from Table 1, it can be seen that the reflective polarizers of Examples 1 and 2 of the present invention have excellent optical properties as compared with Comparative Example 1 but hardly generate color deviation.

Since the reflective polarizer of the present invention has excellent light modulation performance, it can be widely used in fields where optical modulation is required. Specifically, it can be widely used in flat panel display technologies such as a liquid crystal display device, a projection display, a plasma display, a field emission display, and an electroluminescence display which require high brightness such as a mobile display, an LCD and an LED.

Claims (20)

A plurality of platelike polymers dispersed within the substrate to transmit a first polarized light externally irradiated and to reflect a second polarized light, wherein the plurality of platelike polymers are different in refractive index in at least one axial direction from the substrate , The substrate is elongated in at least one axial direction, The plurality of plate-shaped polymers each form a group to reflect the transverse wave (S wave) of a desired wavelength, the plurality of groups are formed, the core layer having a different average optical thickness of the plate-shaped polymer between groups; And
A reflective polarizer in which a polymer is integrally formed on at least one surface of the core layer and includes a skin layer including inorganic particles and a surfactant having an antistatic ability alone or in combination. The method of claim 1,
The reflective polarizer includes an adhesive layer and a protective film on at least one surface,
The adhesive layer is a reflective polarizer in which the polymer is dispersed, characterized in that it comprises a surfactant having an antistatic ability. 3. The method according to claim 1 or 2,
Surfactants having antistatic properties include alkyl sulfate esters, alkyl aryl sulfonic acids or alkyl phosphate esters, quaternary ammonium salts or imidazolines, alkylbetaines, alkylimidasolines, alkylalanines, sorbitan fatty acid esters, glycerol fatty acid esters. At least one selected from the group consisting of poly (oxyethylene) alkylamine and poly (oxyethylene) alkyl ether. The method of claim 1,
Surfactant having the antistatic ability is a reflective polarizer in which the polymer is dispersed, characterized in that it comprises 3 to 20% by weight based on 100% by weight of the skin layer. The method of claim 1,
The inorganic fine particles are colloidal silica or UV-resistant reflective polarizer in which the polymer is dispersed. The method of claim 5,
The colloidal fine particles are reflective polarizer in which the polymer is dispersed, characterized in that the colloidal silica having an average diameter of 1 ~ 200nm. The method of claim 5,
The UV-resistant polymer is any one or more selected from the group consisting of hydroxybenzophenone, hydroxyphenyl benzotriazole, cyanoacrylate, oxanilide, hydroxyphenyl triazine and benzoxazinone. Diffused reflective polarizer. The method of claim 1,
The inorganic fine particles are reflective polarizer in which the polymer is dispersed, characterized in that the silica particles of 1 to 5㎛ size for improving scratch resistance. The method of claim 1, wherein the refractive index of the substrate and the polymer has a difference in refractive index of 0.05 or less in two axial directions, the difference in refractive index of the other one axial direction is 0.1 or more reflective type dispersed Polarizer. The reflective polarizer of claim 1, wherein the plurality of plate-shaped polymers form four groups to reflect light in four wavelength bands. The reflective polarizer with dispersed polymer according to claim 1, wherein the optical thickness of said plate-shaped polymer is 1/3 to 1/5 of a desired light wavelength [lambda]. The method of claim 1,
Optically dispersed reflective polarizer of claim 1, wherein the optical thickness of the polymers included in the same group has a thickness deviation within 30% of the average optical thickness. 11. The reflective polarizer of claim 10, wherein the four reflection bands include wavelength bands of 350 nm, 450 nm, 550 nm, and 650 nm. The reflective polarizer of claim 1, wherein the plurality of groups form a plurality of spaced apart layers based on a longitudinal cross section of the polymer. 15. The method of claim 14,
The number of said layers is 50 or more reflective polarizer dispersed polymer. The reflective polarizer of claim 1, wherein the aspect ratio of the short axis length to the long axis length is 1/1000 or less based on the vertical cross section of the plate-shaped polymer. The reflective polarizer in which the polymer is dispersed according to claim 1, wherein an aspect ratio of the short axis length to the long axis length is 1/5000 or less based on the vertical cross section of the plate-shaped polymer. The reflective polarizer of claim 1, wherein an aspect ratio of the short axis length to the long axis length is 1/30000 or less based on the vertical cross section of the plate-shaped polymer. The method of claim 1,
And wherein the core layer has a maximum value of the spacing between adjacent polymers forming the same group less than a maximum value of the spacing between adjacent polymers between adjacent groups. The method of claim 1,
A reflective polarizer in which a polymer is dispersed, wherein an adhesive layer is not formed between the group and the group, and an adhesive layer is not formed between the core layer and the skin layer.

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