WO2019172651A1 - Plaque de polarisation, et dispositif d'affichage d'image comprenant cette plaque de polarisation - Google Patents

Plaque de polarisation, et dispositif d'affichage d'image comprenant cette plaque de polarisation Download PDF

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Publication number
WO2019172651A1
WO2019172651A1 PCT/KR2019/002606 KR2019002606W WO2019172651A1 WO 2019172651 A1 WO2019172651 A1 WO 2019172651A1 KR 2019002606 W KR2019002606 W KR 2019002606W WO 2019172651 A1 WO2019172651 A1 WO 2019172651A1
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WIPO (PCT)
Prior art keywords
polarizing plate
polarizer
layer
hard coat
coat layer
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PCT/KR2019/002606
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English (en)
Korean (ko)
Inventor
서정현
홍경기
장영래
박진영
Original Assignee
주식회사 엘지화학
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Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to JP2020519739A priority Critical patent/JP7330469B2/ja
Priority to CN201980005100.4A priority patent/CN111213078A/zh
Priority to EP19763725.9A priority patent/EP3677935B1/fr
Priority to US16/760,528 priority patent/US20210223453A1/en
Priority claimed from KR1020190025662A external-priority patent/KR102181559B1/ko
Publication of WO2019172651A1 publication Critical patent/WO2019172651A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements

Definitions

  • the present invention relates to a polarizing plate constituting an image display device and an image display device including the same.
  • the substrate for display As a material for the display window or the front plate of the mobile device, glass or tempered glass having excellent mechanical properties such as strength and tensile strength and excellent shock absorption against external shock is generally used.
  • the glass has a high reflectance and thus lowers the visibility of the display, the weight of the glass itself increases the weight of the mobile device, and there is a problem of breakage due to external impact.
  • plastic resin is being researched as a substitute material for glass.
  • Plastic resin films are lightweight and less prone to break, making them suitable for the trend toward lighter mobile devices.
  • a film coated with a hard coat layer on a supporting substrate has been proposed.
  • a method using a polarizer protective film for protecting the polarizer disposed on the image display surface side of the display is known.
  • the polarizer protective film generally consists of a light transmissive base film, and the light transmissive base film is triacetyl cellulose. Cellulose ester-based film represented by the most widely used.
  • Such a cellulose ester-based film has advantages such as excellent transparency and optical isotropy, little retardation in the plane, no interference fringe, and almost no adverse effect on the display quality of the display device. 2019/172651 1 »(: 1 ⁇ 1 ⁇ 2019/002606
  • the cellulose ester-based film is not only a material having a disadvantage in terms of cost, but also has disadvantages of high moisture permeability and poor water resistance. Due to this high moisture permeability and poor water resistance, a considerable amount of water permeation can occur continuously during use, causing the phenomenon of lifting from the polarizer, which can cause light leakage.
  • polyester-based film such as polyethylene terephthalate seedling film as a base film of the polarizer protective film.
  • Such a polyester-based film is inexpensive, has excellent water resistance, hardly causes light leakage, and has excellent mechanical properties.
  • such a polyester-based film includes an aromatic ring having a high refractive index in the structure, and has a disadvantage of generating a refractive index difference (in-plane birefringence) and an in-plane retardation caused by a difference in elongation in the 3 ⁇ 4 ⁇ / 10 direction during the film forming process. .
  • a refractive index difference in-plane birefringence
  • the present invention effectively suppresses the occurrence of the rainbow phenomenon derived from the polyester-based substrate film, excellent visibility and mechanical properties of the polarizing plate that can be appropriately applied to the window or front plate of the image display device and an image display device comprising the same It is to provide.
  • a polarizer According to an embodiment of the present invention, a polarizer
  • a light-transmitting substrate on the first hard coating layer having a retardation # 3 3 011) of 3000 ⁇ 1 or more, and having a birefringence in plane; And a binder resin positioned on the light transmissive substrate; And a second hard coat layer including; and solid inorganic nanoparticles dispersed in the binder resin.
  • a polarizing plate having an angle between the slow axis of the light transmissive substrate and the absorption axis of the polarizer may be 5 to 85 ° .
  • an image display device including the polarizing plate may be provided.
  • first and second are used to describe various components, and the terms are used only for the purpose of distinguishing one component from other components.
  • (meth) acryl [(meth) acryl] is meant to include both acryl and methacryl.
  • the inorganic nanoparticles of the hollow structure refers to particles having a form in which an empty space exists on the surface and / or inside of the inorganic nanoparticles.
  • a (co) polymer is meant to include both copolymers and homopolymers.
  • the present inventors use a light-transmissive substrate having a birefringence in-plane as a supporting substrate, and in the light-transmissive substrate having a birefringence in the plane, an acute angle formed between a slow axis having the largest refractive index and an absorption axis of the polarizer is formed.
  • the retardation of the light-transmitting substrate having a birefringence in the plane to at least 3, 000nm, 4,000 to 10,000nm, or 5,000 to 8,000nm, the rainbow phenomenon due to destructive interference is suppressed, It was confirmed that the visibility of the image display device can be improved based on the cellulose ester-based film.
  • any of the angle and the retardation of the light transmissive substrate is not controlled to an appropriate range, the mechanical properties may be deteriorated, the rainbow phenomenon may occur due to the birefringence of the light transmissive substrate, and the visibility of the image display apparatus may be degraded. .
  • the polarizing plate including the polarizer and the laminate formed on the polarizer can be suitably applied to the window or the front plate of the image labeling device because of excellent visibility and mechanical properties.
  • the polarizing plate of the embodiment includes a polarizer.
  • the polarizer may be a film made of polyvinyl alcohol (1/1) including a polarizer well known in the art, for example, iodine or a dichroic dye.
  • the polarizer may be prepared by dyeing and stretching an iodine or a dichroic dye on a polyvinyl alcohol film, but a method of manufacturing the same is not particularly limited.
  • the polyvinyl alcohol film may be used without particular limitation as long as it includes a polyvinyl alcohol resin or a derivative thereof.
  • examples of the derivative of the polyvinyl alcohol resin include, but are not limited to, polyvinyl formal resin, polyvinyl acetal resin, and the like.
  • the polyvinyl alcohol film is a commercially available polyvinyl alcohol film generally used in the manufacture of polarizers in the art, for example,? 30,? £ 30,? £ 60 by Gurere, 3000, 3 ⁇ 46000 etc. can be used. '
  • the polyvinyl alcohol film is not limited thereto, but the polymerization degree may be 1000 to 10000 or 1500 to 5000. When the degree of polymerization satisfies the above range, the molecular motion is free and can be mixed flexibly with iodine or dichroic dye.
  • the polarizer may have a thickness of 30 m 1 or less, 20 m or less, 1 to 20 / mm, or 1 to 10 m. In this case, the polarizer Thin weight reduction of devices, such as a polarizing plate and an image display apparatus, is included.
  • the first hard coating layer on one surface of the polarizer, a light transmissive substrate having a birefringence in the surface, and a laminate in which the second hard coating layer is sequentially laminated may be bonded.
  • the light transmissive substrate there is little possibility of causing light leakage due to excellent water resistance, and a polyethylene terephthalate (PET) film having excellent mechanical properties may be used.
  • PET polyethylene terephthalate
  • the first and second hard coating layers are formed on both sides of the light transmissive substrate, respectively, mechanical properties capable of replacing a glass material are provided. Accordingly, the polarizing plate on which the laminate is formed may be a window or front surface of the image display device. Applicable to the edition as appropriate.
  • a quarter wave plate may be bonded to the other surface of the polarizer facing the first hard coating layer.
  • the quarterwave plate has a wave plate that changes the polarization direction of light by 45 °.
  • the incident polarization which is linearly polarized light
  • the incident polarization may be converted into circularly polarized light.
  • the outgoing polarization may be right circularly polarized light (ri ght handed ci rcu l ar po i ar i za t i on).
  • a method of bonding a laminate including the first hard coating layer to one surface of the polarizer and a quarter wave plate to the other surface may include, for example, a roll coater, a gravure coater, a bar coater, a knife coater, or a capillary.
  • After coating the adhesive on the surface of the polarizer, the first hard coating layer or the quarter wave plate using a coater or the like they may be carried out by heating or laminating them with a lamination roll, or laminating by pressing at room temperature, or laminating or UV irradiation.
  • various polarizing plate adhesives used in the art for example, polyvinyl alcohol-based adhesives, polyurethane-based adhesives, acrylic adhesives, cationic or radical-based adhesives, and the like may be used without limitation.
  • the branch includes a first hard coat layer located between the light transmissive substrates.
  • the first hard coating certificate may include a binder resin including a (meth) acrylate-based (co) polymer.
  • the (meth) acrylate type (co) polymer contained in the said binder resin is a monofunctional or polyfunctional (meth) acrylate type repeating unit, and a urethane.
  • Including a (meth) acrylate type repeating unit, high hardness, flexibility, and impact resistance can be imparted to the first hard coat layer.
  • the monofunctional or polyfunctional (meth) acrylate-based repeating unit is derived from a monofunctional or polyfunctional (meth) acrylate-based compound, and the urethane (meth) acrylate-based repeating unit is a urethane (meth) acrylate-based It is derived from a compound. Therefore, the said (meth) acrylate type (co) polymer is the said monofunctional or polyfunctional (meth) acrylate type compound, and urethane.
  • the (meth) acrylate compound may be formed by crosslinking polymerization.
  • the monofunctional or polyfunctional (meth) acrylate-based compound is a compound containing at least one (meth) acrylate structure in the molecule capable of curing the coating film by the cross-linking reaction proceeds by ultraviolet rays, infrared rays, seedlings and heat.
  • the urethane (meth) acrylate compound is a (meth) acrylate compound is bonded through a urethane bond, may be in the form of a monomer or oligomer.
  • the average molecular weight of the urethane (meth) acrylate monomer or oligomer may be 500 to 200, 000, 700 to 150, 000, 1, 000 to 120, 000, or 2,000 to 100, 000.
  • the polarizing plate according to the embodiment includes a light transmissive substrate having a birefringence in the plane located on the first hard coat layer.
  • the light transmissive substrate is a retardation More than 3, 00011111, from 4, 000 2019/172651 1 »(: 1 ⁇ 1 ⁇ 2019/002606
  • the rainbow by arranging on the first hard coating layer so that the acute angle between the slow axis of the light transmissive substrate and the absorption axis of the polarizer is 5 to 85 ° It is possible to exhibit the effect of excellent visibility and excellent mechanical properties without the phenomenon.
  • the retardation is a refractive index in the slow axis direction (3 ⁇ 4), which is the direction of the largest refractive index in the plane of the light transmissive substrate, a refractive index in the fast axis direction (), which is orthogonal to the slow axis direction, and the thickness of the light transmissive substrate.
  • (1 (unit: 11111) 1- may be calculated by substituting into Equation 1 below).
  • the retardation can also be obtained by the following method.
  • two axial refractive indices (3 ⁇ 4,%) which are provided in the alignment axis direction of the light-transmitting substrate using two polarizing plates and orthogonal to the orientation axis direction are obtained by Shore 6 Refractive Index Function-4.
  • Shore 6 Refractive Index Function-4 the axis showing a larger refractive index is defined as the slow axis.
  • the thickness of the light transmissive substrate is measured using an electric micrometer, for example, and the refractive index using the refractive index obtained above Calculation is referred to as bus 11) and can be determined by the product between the thickness of the retardation (1 (ä) of the refractive index difference between switch 11 and the light-transmitting substrate.
  • the refractive index difference (s11) is less than 0.05, the light transmissive substrate required to obtain the retardation value described above is on the other hand, if the refractive index difference 11 exceeds 0.20, it is necessary to excessively increase the draw ratio, so that the light-transmissive substrate is likely to be torn and broken, which may significantly reduce the practicality as an industrial material. And damp-heat resistance may be lowered.
  • the refractive index (3 ⁇ 4) in the slow axis direction of the light transmissive substrate is 1.60 to 2019/172651 1 »(: 1 ⁇ 1 ⁇ 2019/002606
  • the refractive index (%) in the fast axis direction of the light transmissive substrate having the birefringence in the plane may be 1.50 to 1.70, or 1.55 to 1.65.
  • the thickness of the light transmissive substrate having the birefringence in the plane is not limited thereto, but may be 10 to 500 // III, 30 to 400, or 50 to 350 /.
  • the thickness of the light transmissive substrate is less than 10 / thickness, the thickness of the hard coating layer is too thin, so that warpage may occur, and the flexibility of the light transmissive substrate may be difficult to control the process.
  • the thickness is greater than 500, the transmittance of the light transmissive substrate is reduced. Optical properties may decrease, and it is difficult to thin an image display device including the same.
  • the light-transmitting base material is excellent in water resistance and hardly cause a light leakage phenomenon, it is possible to use a polyethylene terephthalate seed film excellent mechanical properties.
  • the polarizing plate of the embodiment includes a second hard coat layer positioned on the light transmissive substrate having a birefringence in the plane.
  • the second hard coat layer is a binder resin; And solid-type inorganic nanoparticles dispersed in the binder resin, to impart high hardness, flexibility, and impact resistance to the second hard coating layer.
  • the binder resin of the second hard coat layer may include a photocurable resin and a (co) polymer (hereinafter, referred to as a high molecular weight (co) polymer) having a weight average molecular weight of 10, 001 ⁇ 2 /
  • the photocurable resin is a polymer of a photopolymerizable compound which can cause a polymerization reaction when light such as ultraviolet rays is irradiated, such as urethane acrylate oligomer, epoxide acrylate oligomer, polyester acrylate and polyether acrylate.
  • One or more kinds selected from the group consisting of polyfunctional acrylate monomers made may be used.
  • the high molecular weight (co) polymer is, for example, at least one polymer selected from the group consisting of cellulose depolymers, acrylic polymers, styrene polymers, epoxide polymers, nylon polymers, urethane polymers and polyolefin polymers. It may include.
  • Solid-type inorganic nanoparticles dispersed in the binder resin of the second hard coating layer refers to particles having a maximum diameter of less than 100 11111 and no empty space therein.
  • the solid inorganic nanoparticles may have a diameter of 0.5 to 100, or 1 to 30
  • the solid inorganic nanoparticles may have a density of 2.00 yaw / to 5.01 ⁇ 2 / 01 sec.
  • the solid inorganic nanoparticles may contain at least one reactive functional group selected from the group consisting of a (meth) acrylate group, an epoxide group, a vinyl group (1) and a thiol group (3 ⁇ 4 ratio1) on the surface.
  • a reactive functional group selected from the group consisting of a (meth) acrylate group, an epoxide group, a vinyl group (1) and a thiol group (3 ⁇ 4 ratio1) on the surface.
  • the thickness ratio of the first hard coat layer and the second hard coat layer may be 1: 0.5 to 1: 1.5, 1: 0.6 to 1.4, or 1: 0.8 to 1.3.
  • the thickness ratio of the first hard coat layer and the second hard coat layer is less than 1: 0.5 or more than 1: 1.5, the whip of the film is generated and it is difficult to maintain a flat film form and cannot be used as an optical film.
  • the thickness ratio of the light transmissive substrate and the second hard coat layer may be 1: 0.1 to 1: 1, 1: 0.2 to 0.9, or 1: 0.3 to 0.8.
  • the light transmissive substrate and the second hard coating layer have a thickness ratio of less than 1: 0.1, the hardness and scratch resistance of the film may be lowered to protect the polarizing plate from external impact. In the bonding process and the first hard coating layer cotang process, the film may be broken without bending.
  • the composition for forming the first and second hard coating layers on the face of the light transmissive substrate respectively, roll coater, gravure Coater, Bar Coater, 2019/172651 1 »(: 1 ⁇ 1 ⁇ 2019/002606
  • the solvent may be volatilized, and then heat / photocured to prepare a laminate including the first and second hard coat layers.
  • the polarizer or the laminate is coated with an adhesive using a roll coater, a gravure coater, a bar coater, a knife coater or a capillary coater, and then laminating them with a lamination roll, or laminating by pressing at room temperature or laminating. It may be carried out by a method such as irradiation.
  • the adhesive various polarizing plate adhesives used in the art, for example, polyvinyl alcohol-based adhesives, polyurethane-based adhesives, acrylic adhesives, cationic or radical-based adhesives and the like can be used without limitation.
  • the polarizing plate It can manufacture.
  • the polarizing plate of the embodiment may further include a low reflection layer positioned on the second hard coating layer.
  • a low reflection layer is a binder resin; And inorganic nanoparticles dispersed in the binder resin.
  • the inorganic nanoparticles may be hollow inorganic nanoparticles, solid inorganic nanoparticles, or a mixture thereof.
  • the binder resin includes a (co) polymer containing a polyfunctional (meth) acrylate-based repeating unit, and the repeating unit is, for example, trimethylolpropane triacrylamide Trimethylolpropaneethoxy triacrylic
  • It may be derived from a polyfunctional (meth) acrylate-based compound such as glycerin propoxylated triacrylate 1 ⁇ 2 ⁇ / ⁇ ), pentaerythritol tetraacrylate oxy, or dipentaerythritol nuxaacrylate ( ⁇ ). .
  • a polyfunctional (meth) acrylate-based compound such as glycerin propoxylated triacrylate 1 ⁇ 2 ⁇ / ⁇ ), pentaerythritol tetraacrylate oxy, or dipentaerythritol nuxaacrylate ( ⁇ ).
  • the low reflection layer may further include a fluorine-containing compound having a photoreactive functional group and / or a silicon-based compound having a photoreactive functional group.
  • the photoreactive functional group contained in the compound or silicone compound may include one or more functional groups selected from the group consisting of (meth) acrylate groups, epoxide groups, vinyl groups (1 1) and thiol groups (1 ⁇ 01). .
  • the fluorine-containing compound including the photoreactive functional group may include 1) an aliphatic compound or an aliphatic ring compound in which one or more photoreactive functional groups are substituted and at least one fluorine is substituted for at least one carbon; ) A hetero near aliphatic compound substituted with one or more photoreactive functional groups, at least one hydrogen substituted with fluorine, and one or more carbons substituted with silicon; or a hetero (11 li-0) aliphatic ring compound; 1 1 1) polydialkylsiloxane polymers in which at least one photoreactive functional group is substituted and at least one fluorine is substituted in at least one silicon; And a polyether compound substituted with at least one photoreactive functional group and at least one hydrogen is replaced with fluorine.
  • the hollow inorganic nanoparticles refer to particles having a maximum diameter of less than 200 L and have a void space on the surface and / or inside thereof.
  • the hollow inorganic nanoparticles may include one or more selected from the group consisting of solid inorganic fine particles having a number average particle diameter of 1 to 200 11111, or 10 to 100 11111.
  • the hollow inorganic nanoparticles may have a density of 1.5 ⁇ / 011 1 to 3.50 ⁇ / (.
  • the hollow inorganic nanoparticles may contain at least one reactive functional group selected from the group consisting of a (meth) acrylate group, an epoxide group, a vinyl group (1), and a thiol group (3 ⁇ 4 ratio1) on the surface.
  • a reactive functional group selected from the group consisting of a (meth) acrylate group, an epoxide group, a vinyl group (1), and a thiol group (3 ⁇ 4 ratio1) on the surface.
  • the solid inorganic nanoparticles may include at least one member selected from the group consisting of solid inorganic fine particles having a number average particle diameter of 0.5 to 100 ⁇ .
  • the low reflection layer is 10 to 400 parts by weight of the inorganic nanoparticles relative to 100 parts by weight of an additive (co) polymer; And 20 to 300 parts by weight of a fluorine-containing compound and / or a silicon-based compound including the photoreactive functional group.
  • the polarizer includes such a low reflection layer, the first 2019/172651 1 »(: 1 ⁇ 1 ⁇ 2019/002606
  • the reflection itself in the transparent substrate positioned on the hard coating layer can be reduced, and as a result, it is possible to effectively suppress the occurrence of the rainbow phenomenon in the polarizing plate of one embodiment. In addition, it is possible to further improve the resolution and visibility by reducing the diffuse reflection on the display surface of the image display device including the low reflection layer.
  • Such a low reflection layer is, for example, 1.3 to 1.5, 1.35 to 1.45, or 1.38 to 1, in order to effectively suppress reflection on a light transmissive substrate having a birefringence in the surface, or diffuse reflection on a display surface of an image display device. It has a refractive index of 1.43 and may have a thickness of 1 to 300ä, 5 to 200ä, or 50 to 150ä.
  • the polarizing plate of the embodiment may further include a fouling resistant layer positioned on the second hard coating layer.
  • the stain resistant layer is a binder resin; Solid inorganic nanoparticles dispersed in the binder resin; And fluorine-based compounds.
  • the binder resin of the fouling resistant layer may include a copolymer containing a (meth) acrylate-based repeating unit.
  • the (meth) acrylate-based repeating unit is, for example, trimethylolpropane triacrylamide
  • Trimethylolpropaneethoxy triacrylic It may be derived from polyfunctional (meth) acrylate-based compounds such as glycerin propoxylated triacrylate 1 ⁇ 2-70, pentaerythritol triacrylate ⁇ / ⁇ ), or dipentaerythritol nuxaacrylate ().
  • the binder resin of the fouling resistant layer may be used by mixing two or more kinds in order to maintain appropriate dispersibility and crosslinking degree when mixed with solid inorganic nanoparticles.
  • the solid inorganic nanoparticles may have a diameter of 0.5 to 100 11 microns, or 1 to 30 1ä.
  • the solid inorganic nanoparticles may have a density of 2.00 ⁇ / 011 1 to kr /.
  • the solid inorganic nanoparticles may contain at least one reactive functional group selected from the group consisting of (meth) acrylate groups, epoxide groups, vinyl groups (1) and thiol groups (1 ⁇ 01) on the surface. . By including the reactive functional group described above on the surface of the solid inorganic nanoparticles, it may have a higher degree of crosslinking, thereby ensuring more improved antifouling properties.
  • the fluorine-based compound is at least one fluorine element of the compound 2019/172651 1 »(: 1 ⁇ 1 ⁇ 2019/002606
  • the fouling resistant layer may include a fluorine-based compound, or may include a crosslinked (co) polymer between the fluorine-based compounds.
  • the fluorine-based compound has a weight average molecular weight of 2,000, 200, 000, or 5, 000 to 100, 000
  • the weight average molecular weight of polystyrene conversion measured by " can be used.
  • the weight average molecular weight of the fluorine-based compound is less than 2,000, the fluorine-based compounds may not be uniformly and effectively arranged, and the stain resistance of the fouling-resistant layer may be lowered, and when it exceeds 200, 000, compatibility with other components may be lowered.
  • the polarizing plate may further include an adhesive layer formed on the other surface of the quarterwave plate to face the polarizer.
  • the polarizer may be positioned on one surface of the quarterwave plate, and the adhesive layer may be positioned on the opposite surface of the quarter wave plate of the polarizer.
  • the adhesive layer may enable attachment of the polarizing plate of the embodiment and the image panel of the image display device.
  • the adhesive layer may be formed using various adhesives well known in the art, and the kind thereof is not particularly limited.
  • the pressure-sensitive adhesive layer may be a rubber pressure sensitive adhesive, an acrylic pressure sensitive adhesive, a silicone pressure sensitive adhesive, a urethane pressure sensitive adhesive, a polyvinyl alcohol pressure sensitive adhesive, a polyvinylpyrrolidone pressure sensitive adhesive, a polyacrylamide pressure sensitive adhesive, a cellulose pressure sensitive adhesive, a vinyl alkyl ether pressure sensitive adhesive, or the like. It can be formed using.
  • the pressure-sensitive adhesive layer may be formed by applying a pressure-sensitive adhesive on the upper portion of the quarter wave plate, or may be formed by attaching a pressure-sensitive adhesive sheet prepared by applying an adhesive on a release sheet and then drying the pressure-sensitive adhesive sheet on the upper portion of the quarter wave plate. .
  • the laminate including the light-transmitting substrate having a birefringence in the surface and the first and second hard coating layers formed on both sides of the light-transmissive substrate is bonded, hardness, etc. Its mechanical properties are very good.
  • the polarizer may have a pencil hardness greater than or equal to, 9 to 9, or even at 500 ⁇ load.
  • the polarizing plate may include a structure excluding the polarizer, that is, the first hard coating layer, the light transmissive substrate, and the second hard motor layer.
  • the pencil hardness under load may be greater than or equal to, or less than, or less than. Further, it may be a laminate, and the laminate of the low reflection layer formed on (or stain layer) over the anti-reflection film has a pencil hardness ⁇ from lkg load, including, 7H to 9H, or 8H to 9H.
  • the light transmissive substrate having a birefringence in the plane included in the polarizing plate since the acute angle between the slow axis of the light transmissive substrate and the absorption axis of the polarizer is arranged to be 5 to 85 °, the rainbow phenomenon is There is an advantage that is suppressed.
  • the reflectance of the polarizing plate is measured, and the difference between the average reflectance and the maximum reflectance and the minimum reflectance is measured from the measured reflectance data, and then substituted into the following Equation 1
  • the rainbow variable ratio can be checked regularly.
  • the reflectance measurement of the polarizing plate using Shimadzu's UV-VIS spectrometer (UV-VIS spectrometer, model name: UV2550), 5 ° reflection mode, the slit width (siit width) 2imi, and the analysis wavelength range of 380 to 780 nni
  • UV-VIS spectrometer model name: UV2550
  • the slit width (siit width) 2imi
  • the analysis wavelength range 380 to 780 nni
  • the difference between the reflectance average and the maximum reflectance and the minimum reflectance at 450 to 650iim was calculated and substituted into the following Equation 1 for the variation ratio of the rainbow: (A Rb) can be calculated.
  • the rainbow variable ratio may be 10% or less, or 1% to 10%.
  • ARb (maximum reflectance at 450 to 650 nm-minimum reflectance at 450 to 650 nm) ⁇ (reflection average at 450 to 650 nm) x 100
  • an image display device including the polarizing plate.
  • the image display device includes a display panel; And the polarizing plate disposed on at least one surface of the display panel.
  • the display panel may be a liquid crystal panel, a plasma panel, and an organic light emitting panel.
  • the image display device may be a liquid crystal display (LCD), a plasma display device) and an organic light emitting display device (0LED).
  • the image display device may be a liquid crystal display device including a liquid crystal panel and a light laminated body provided on both surfaces of the liquid crystal panel, wherein at least one of the polarizing plates described above It may be a polarizing plate including a polarizer according to the embodiment.
  • the type of liquid crystal panel included in the liquid crystal display device is not particularly limited, but, for example, TN (twi sted nematic) type, STN (super twisted nematic) type, F (ferroelectic) type or PD (polymer dispersed) Passive matrix panels such as type; Active matrix panels such as two terminal or three terminal; All known panels, such as an In Plane Switching (IPS) panel and a Vertical Alignment (VA) panel, can be applied.
  • TN twi sted nematic
  • STN super twisted nematic
  • F ferrroelectic
  • PD polymer dispersed
  • Passive matrix panels such as type
  • Active matrix panels such as two terminal or three terminal
  • All known panels such as an In Plane Switching (IPS) panel and a Vertical Alignment (VA) panel, can be applied.
  • IPS In Plane Switching
  • VA Vertical Alignment
  • the polarizing plate and the image display including the same which can be preferably applied to the window or the front plate of the image display device while including a polyester-based film, but the rainbow phenomenon does not appear, and excellent visibility and mechanical properties
  • An apparatus may be provided.
  • Aekyung Chemical's DN980S which is an HDI-based trimer, is used as a polyethylene glycol-modified (meth) acrylate compound, and includes different repeating numbers of polyethylene glycol repeating units with different number average molecular weights.
  • PMMA Polymethylmethacrylate
  • PBA polybutylacrylate
  • a high molecular weight copolymer (PMMA-PBA block copolymer) was prepared by RAFT polymerization (Reversible addition fragment chain transfer polymerization). At this time, the volume ratio of PMMA and PBA was about 1: 1, and the number average molecular weight was about 30,000 g / mol. In addition, the average particle diameter of the micelle structure formed by self-assembly of PMMA-PBA block copolymer was about 15 nm.
  • TMPTA trimethylpropyl triacrylate
  • MMPTA trimethylpropyl triacrylate
  • MIBK methyl isobutyl ketone
  • Pentaerythritol triacrylate (PETA) 12.48 g, C165 (solid silica nanoparticles with an average diameter of 12 nni and pentaerythritol triacrylate in a 1: 1 weight ratio product) 49.90 g, Synthesis Example 2 4.80 g of high molecular weight copolymer, 2.69 g of TP0 (Ciba photocuring initiator), 0.13 g of T270 (Tego leveling agent), 20 g of ethyl methyl ketone (MEX) as a solvent, and methyl isobutyl ketone (MIBK)
  • Dipentaerythritol nucleoacrylate 4.12 g, C165 (average size) 12 nm hollow nanoparticles and pentaerythritol triacrylate in a 1: 1 weight ratio.
  • NanoResin 51.49 g, 6.18 g of the high molecular weight copolymer prepared in Synthesis Example 2, 3.09 g of TP0 (Initiator for Ciba photocuring), 0.12 g of T270 (Tego leveling agent), ethyl methyl ketone solvent (MEIO 23.33 g and methyl isobutyl ketone (MIBK) are mixed to form a coating solution for forming a second hard coat layer (B-
  • TMPTA trimethylolpropane triacrylate
  • hollow silica nanoparticles hollow silica nanoparticles (diameter range: about 42 nm to 66 nni, manufactured by JSC catalyst and chemicals) 283 g
  • solid silica nanoparticles solid silica nanoparticles (diameter range: about 12 nni) 19 nm) 59 g
  • 1st fluorine-containing compound X-71-1203M, ShinEtsu
  • 2nd fluorine-containing compound RS-537, DIC) 15.5g
  • initiator Irgacure 127, Ciba
  • MIBK A coating solution (C) for forming a low reflection layer was prepared by diluting the solvent to (methyl isobutyl ketone) to a solid content concentration of 3% by weight.
  • PETA pentaerythritol triacrylate
  • reactant of toluene diisocyanate and penta erythritol triacrylate as urethane acrylate U-306T, Kyoeisha
  • Coating solution for forming a first hard coat layer prepared in Preparation Example 1 on a polyethylene terephthalate film having a thickness of 250 II and 3000 ä retardation (coating the city with # 85 and drying at 80 ° (: 2 minutes, It hardened
  • the lamp was used for 0 ⁇ ⁇ , and the curing reaction was carried out under nitrogen atmosphere.
  • the amount of light irradiated during curing is 10001111/0111 2 .
  • the coating thickness was 71.
  • [IV curing of the second hard coating was a zero ratio lamp, which was cured under a nitrogen atmosphere. The amount of light irradiated upon curing is 1801111/011 2 . The thickness of the second hard coat layer was measured with a thickness gauge, and the coating thickness was 45.
  • the coating liquid for forming a low reflection layer prepared in Preparation Example 4 (0 to # 10 It was coated so as to have a thickness of about 100 ⁇ , dried for 1 minute in a 90 oven, and cured to form a low reflection layer. At the time of the curing, the coating dried under nitrogen purge was irradiated with ultraviolet light of 252 /.
  • Quarter wave plates were laminated to one side of the polyvinyl alcohol polarizer using a ⁇ curable adhesive and then bonded. On the other side of the polyvinyl alcohol polarizer to which the quarter wave plate film was not bonded, the surface of the first hard coat layer of the laminate was bonded with a curable adhesive. At this time, polyvinyl alcohol 2019/172651 1 »(: 1 ⁇ 1 ⁇ 2019/002606
  • a laminate was prepared in the same manner as in Example 1, except that the thickness of the first hard coat layer was 75, and the thickness of the second hard coat layer was 42 11.
  • the stain resistant layer prepared in Preparation Example 5 It was coated to a thickness of about 3 ⁇ 17)-, dried for 2 minutes in a 90 oven, and cured to form a fouling resistant layer. At the time of curing, the dried coating was irradiated with ultraviolet rays of 252111 ⁇ 1/01 / under nitrogen purge.
  • a polarizing plate was manufactured in the same manner as in Example 1 except that the angle formed between the absorption axis of the polyvinyl alcohol polarizer and the slow axis of the polyethylene terephthalate film was controlled to 50 ° .
  • Example 3
  • a second hard coat layer is formed by using the second hard coat layer forming coating liquid ⁇ -2) instead of the second hard coating layer forming coating liquid ⁇ -1), the thickness of the first hard coating layer is controlled to 100, and the second hard coating layer is formed.
  • a laminate was produced in the same manner as in Example 1, except that the thickness of was controlled to 70.
  • a fouling resistant layer was formed on the second hard coat layer in the same manner as in the fouling resistant layer forming method of Example 2.
  • a polarizing plate was manufactured in the same manner as in Example 1, except that the angle formed between the absorption axis of the polyvinyl alcohol polarizer and the slow axis of the polyethylene terephthalate film was controlled at 50 ° .
  • Example 4
  • a laminate was manufactured in the same manner as in Example 1, except that the polyethylene terephthalate film had a thickness of 80 ⁇ 1 , the thickness of the first hard coat layer was 22 / thickness, and the thickness of the second hard coat layer was 21. did.
  • the stain resistant layer was formed on the second hard coat layer in the same manner as the stain resistant layer forming method of Example 2, except that the thickness of the stain resistant layer was 2.8 1.
  • Example 2 The same method as in Example 1, except that a triacetyl cellulose film having a thickness of 80 is used instead of the polyethylene terephthalate film, the thickness of the first hard coating layer is 24, and the thickness of the second hard coating layer is 21 /.
  • the laminate was manufactured. 2019/172651 1 »(: 1 ⁇ 1 ⁇ 2019/002606
  • a fouling resistant layer was formed on the second hard coat layer in the same manner as in the fouling resistant layer forming method of Example 2.
  • the polarizing plate was manufactured in the same manner as in Example 1, but the triacetyl cellulose film was a non-stretched film, so the distinction between the slow axis and the fast axis was ambiguous. Comparative Example 2
  • a laminate was manufactured in the same manner as in Example 1, except that the thickness of the first hard coat layer was 73 ⁇ and the thickness of the second hard coat layer was 42.
  • the stain resistant layer was formed on the second hard coat layer in the same manner as the stain resistant layer forming method of Example 2, except that the thickness of the stain resistant layer was 2.7 //.
  • a polarizing plate was manufactured in the same manner as in Example 1 except that the angle formed between the absorption axis of the polyvinyl alcohol polarizer and the slow axis of the polyethylene terephthalate film was controlled to 0 ° . Comparative Example 3
  • a laminate was prepared in the same manner as in Example 1, except that the first hard coat layer was not formed. 2019/172651 1 »(: 1 ⁇ 1 ⁇ 2019/002606
  • the stain resistant layer was formed on the second hard coat layer in the same manner as the stain resistant layer forming method of Example 2, except that the thickness of the stain resistant layer was 2.8 /.
  • a structure in which polarizers are not laminated that is, a laminate including (1) the first hard coat layer, the light-transmissive substrate, and the second hard coat layer, and (2) the stain resistant layer (or with respect to the low-hard coating film comprising a reflective layer), and then it scratched 5 times with a load angle, 45 ° for 1, 4.01, according to the measurement standard 1 (5400 using a pencil hardness tester to visually determine the maximum hardness without flaws It evaluated and the result was shown in following Table 1.
  • the polarizing plate was cut to a size of 4 cm X 4 cm, a black tape (Vinyl tape 472 Bl ack, manufactured by 3M) was attached to the second hard coating layer, and then a Shimadzu UV-VIS spectrometer (UV-VIS spectrometer, Model name: UV2550) was used to measure reflectance at 5 ° reflection mode, slit width 2nm, analysis wavelength range 380-780nm, and reflectance data between 450-650nni was derived.
  • a black tape Vinyl tape 472 Bl ack, manufactured by 3M
  • UV2550 Shimadzu UV-VIS spectrometer
  • ARb (maximum reflectance at 450 to 650 nm-minimum reflectance at 450 to 650 nm) ⁇ (reflection average at 450 to 650 nm) x 100
  • the stain resistant layer or the low reflection layer of the polarizing plates of Examples and Comparative Examples cut to the size of 10cm x 10cm face up, and pressed the middle part of the polarizing plate with a rod having a diameter of lcm or less so that the center part touches the bottom. At this time, the height of the four vertices was measured from the bottom surface, and then the average of the heights was calculated to obtain the warpage value. The warpage values thus obtained were expressed as positive numbers. If the film is bent in the direction of the first hard coating layer, the polarizing plate is inverted to bring the stain resistant layer or the low reflection layer to the bottom, and the warpage value is obtained by the same method, and the warpage value at this time is negatively expressed.
  • Examples 1 to 4 have excellent pencil hardness, no rainbow phenomenon, low rainbow fluctuation ratio and whip value was confirmed that the excellent optical and mechanical properties.
  • Comparative Example without using a light-transmitting substrate having a birefringence in plane
  • Comparative Example 1 shows low mechanical properties due to low pencil hardness
  • Comparative Example 2 having an angle of 0 ° formed by the slow axis of the light transmissive substrate and the absorption axis of the polarizer exhibits a rainbow phenomenon and a high rainbow fluctuation ratio, resulting in low optical characteristics.
  • Comparative Example 3 which does not include a hard coat layer, confirmed that the whip value was very high.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

L'invention concerne une plaque de polarisation et un dispositif d'affichage, la plaque de polarisation comprenant : un polariseur ; une première couche de revêtement dur qui est disposée sur le polariseur, et qui contient une résine liante incluant un (co)polymère à base de (méth)acrylate ; un matériau de base transmettant la lumière qui se situe sur la première couche de revêtement dur, qui présente un retard de 3 000 nm ou plus, et qui possède une biréfringence dans le plan ; ainsi qu'une seconde couche de revêtement dur qui se trouve sur le matériau de base transmettant la lumière, et qui comporte une résine liante et des nanoparticules inorganiques solides dispersées dans la résine liante, l'angle formé par un axe lent de ce matériau de base transmettant la lumière et un axe d'absorption du polariseur étant de 5 à 85 degrés.
PCT/KR2019/002606 2018-03-06 2019-03-06 Plaque de polarisation, et dispositif d'affichage d'image comprenant cette plaque de polarisation WO2019172651A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2020519739A JP7330469B2 (ja) 2018-03-06 2019-03-06 偏光板およびこれを含む画像表示装置
CN201980005100.4A CN111213078A (zh) 2018-03-06 2019-03-06 偏光板和包括其的图像显示装置
EP19763725.9A EP3677935B1 (fr) 2018-03-06 2019-03-06 Plaque de polarisation, et dispositif d'affichage d'image comprenant cette plaque de polarisation
US16/760,528 US20210223453A1 (en) 2018-03-06 2019-03-06 Polarizing plate and image display device comprising the same

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20180026390 2018-03-06
KR10-2018-0026390 2018-03-06
KR10-2019-0025662 2019-03-06
KR1020190025662A KR102181559B1 (ko) 2018-03-06 2019-03-06 편광판 및 이를 포함하는 화상 표시 장치

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KR20180026390A (ko) 2015-05-27 2018-03-12 파마케아, 인크. 오토탁신 억제제 및 이의 용도
KR20190025662A (ko) 2017-07-06 2019-03-11 프라마톰 게엠베하 원자력 발전소의 금속면을 제염하는 방법

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KR20180026390A (ko) 2015-05-27 2018-03-12 파마케아, 인크. 오토탁신 억제제 및 이의 용도
KR20190025662A (ko) 2017-07-06 2019-03-11 프라마톰 게엠베하 원자력 발전소의 금속면을 제염하는 방법

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