WO2007145111A1 - 偏光板、画像表示装置および偏光板の製造方法 - Google Patents
偏光板、画像表示装置および偏光板の製造方法 Download PDFInfo
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- WO2007145111A1 WO2007145111A1 PCT/JP2007/061437 JP2007061437W WO2007145111A1 WO 2007145111 A1 WO2007145111 A1 WO 2007145111A1 JP 2007061437 W JP2007061437 W JP 2007061437W WO 2007145111 A1 WO2007145111 A1 WO 2007145111A1
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- Prior art keywords
- polarizing plate
- polarizer
- cured resin
- resin layer
- layer
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/50—Protective arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
- Y10T428/264—Up to 3 mils
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
- Y10T428/264—Up to 3 mils
- Y10T428/265—1 mil or less
Definitions
- Polarizing plate image display device, and manufacturing method of polarizing plate
- the present invention relates to a polarizing plate, an image display device, and a method for manufacturing a polarizing plate.
- An LCD is a device that displays characters, images, etc. by utilizing the electro-optical properties of liquid crystal molecules.
- an LCD includes a liquid crystal cell and two polarizing plates arranged on both sides of the liquid crystal cell.
- the polarizing plate generally has a configuration in which a protective film is attached to both sides of a polarizer with an adhesive.
- a triacetyl cellulose (TAC) film has been widely used as the protective film.
- the polarizing plate may be subjected to a hard coat (hardening) treatment.
- the hard coat treatment is performed by forming a hard coat layer on a TAC film using a photocurable resin.
- the hard coat treatment is generally applied to one of the TAC films on both sides of the polarizer (see, for example, Patent Document 1).
- Patent Document 1 Japanese Patent Laid-Open No. 2005-338550
- Patent Document 2 Japanese Unexamined Patent Publication No. 2005-10329
- an object of the present invention is to provide a polarizing plate that can be thinned with high hardness and that has excellent polarization characteristics.
- the polarizing plate of the present invention comprises:
- a polarizing plate comprising a polarizer, an adhesive layer, and a cured resin layer
- the adhesive layer is laminated on at least one surface of the polarizer
- the cured resin layer is laminated on the surface of the adhesive layer opposite to the polarizer, and the thickness of the adhesive layer is in the range of 0.1 111 to 10 111,
- the cured resin layer is a cured resin layer formed from a solventless photocurable composition containing the following components (A) and (B).
- the image display device of the present invention is an image display device equipped with a polarizing plate, wherein the polarizing plate is the polarizing plate of the present invention.
- the inventors of the present invention have made a series of studies on deterioration of characteristics of a conventional polarizing plate in which a protective layer is directly formed on a polarizer using a photopolymerizable compound.
- a solvent for forming the protective layer since the conventional polarizing plate uses a solvent for forming the protective layer, it has been found that the characteristics are deteriorated when the solvent erodes the polarizer.
- a cured resin layer is formed on at least one surface of the polarizer, and an adhesive layer having a thickness in the range of 0.1 ⁇ m to 10 m.
- the polarizing plate of this invention is excellent in the adhesiveness of a polarizer and a cured resin layer, and its surface hardness is high because the thickness of the said adhesive bond layer exists in the said range. That is, when the thickness of the adhesive layer is within the above range, peeling of the polarizer and the cured resin layer can be prevented, the hardness of the cured resin layer can be improved, and the curing can be performed. It is possible to prevent the occurrence of cracks on the surface of the resin layer.
- the polarizing plate of the present invention can be thinned because the protective layer can be omitted.
- FIG. 1 (a) is a schematic cross-sectional view showing an example of the constitution of the polarizing plate of the present invention
- FIG. FIG. 5 is a schematic cross-sectional view showing another example of the configuration of the polarizing plate of the present invention.
- FIG. 2 is a schematic view showing an example of production of a polarizer.
- FIG. 3 is a schematic view showing an example of the production of the polarizing plate of the present invention.
- the composite elastic modulus of the polarizer is preferably 6 GPa or more.
- the adhesive layer is a cured layer of a polyurethane resin composition.
- the polyurethane resin composition may be a one-component moisture-curable polyurethane resin composition.
- the polyurethane resin composition may be an aqueous polyurethane dispersion.
- the thickness of the cured resin layer is in the range of 10 ⁇ to 30 / ⁇ m.
- the polyfunctional acrylic monomer or polyfunctional methacrylic monomer component (A) has at least four allyloyl groups or methacrylic groups in the molecular structure.
- the polyfunctional acrylic monomer and polyfunctional methacrylic monomer power of the component (A) are preferably monomers represented by the following general formula (I).
- Rl, R2, R3, R4, R5 and R6 are each independently a hydrogen atom, an attalyloyl group or a methacrylyl group, and Rl, R2, R3, R4, R5 and R6 In the formula, at least four are an taliloyl group or a methacryl group.
- the photocurable prepolymer of the component (B) is preferably at least one of polyurethane acrylate and polyurethane metatalylate.
- the solventless photocurable composition further contains the following component (D).
- the solventless photocurable composition further contains the following component (C).
- the photopolymerization initiator of the component (C) is a acetophenone-based initiator.
- the polarizer includes iodine and a polyvinyl alcohol-based resin.
- the cured resin layer also serves as both a hard coat layer and a protective layer.
- the method for producing a polarizing plate of the present invention is, for example, a production method including the following steps [1] to [6].
- the coating film is cured to form a cured resin layer, whereby the first laminate (R1) is obtained.
- the polarizing plate of the present invention includes a polarizer, an adhesive layer, and a cured resin layer.
- the adhesive layer is laminated on at least one surface of the polarizer.
- the cured resin layer is laminated on the surface of the adhesive layer opposite to the polarizer. That is, in the present invention, a cured resin layer is laminated on at least one surface of the polarizer via an adhesive layer.
- the adhesive layer and the cured resin layer may be laminated on one side of the polarizer, or may be laminated on both sides of the polarizer.
- the planar shape of the polarizing plate is, for example, a rectangle, a square or a rectangle, but is preferably a rectangle.
- the planar shape of each constituent member such as the polarizer, the adhesive layer, and the cured resin layer may be a square or a rectangle that is preferably rectangular. Preferably, it is a rectangle that matches the planar shape of the polarizing plate.
- the polarizing plate can be thinned if the cured resin layer preferably has both a hard coat layer and a protective layer.
- the ratio (dlZd2) of the thickness (dl) of the cured resin layer to the thickness (d2) of the polarizer is preferably 0.3 to 1. It is in the range of 2, more preferably in the range of 0.4 to 1.0, and still more preferably in the range of 0.5 to 0.8.
- the ratio of the thickness (dl) of the cured resin layer to the thickness (d3) of the adhesive layer (dlZd3) is preferably in the range of 2 to 40, more preferably in the range of 5 to 35, and still more preferably in the range of 7 to 20.
- the pencil hardness on the surface of the cured resin layer is preferably 6H or more, more preferably 7H to 9H, and further preferably 9H.
- the pencil hardness is a pencil drawing value measured according to JIS K 5400 (1990 edition). None of the conventional hard-coated polarizing plates showed a hardness of 6H or higher. The reason is guessed as follows.
- the hard coating layer of the conventional polarizing plate that could not achieve a high hardness of V, 6H or higher was a TAC film on both sides of the polarizer. It is surmised that this was because a protective resin layer was disposed and a cured resin layer was formed on the surface of the protective layer.
- a solvent-free photocurable composition is used to cure the cured film through an adhesive layer having a thickness in the range of 0.1 ⁇ m to 10 m on the surface of the polarizer. It is inferred that by laminating the oil layer, a high surface hardness of 6H or more can be obtained. In this way, it has been found that a high hardness of 6H or more can be realized by laminating a cured resin layer on the surface of the polarizer through an adhesive layer having a thickness of 0 .: m to LO / zm. This is the first time the present inventors have made this, and it can be said that this is an excellent effect that cannot be expected by those skilled in the art. The inference does not limit or limit the present invention.
- FIG. 1 (a) The configuration of an example of the polarizing plate of the present invention is shown in the sectional view of Fig. 1 (a).
- the size and ratio of each component are different from actual ones in order to make it easier to distribute the configuration of the polarizing plate of the present invention, and other configuration diagrams (Fig. 1 (b)) are also shown. It is the same.
- the first adhesive layer 2 is laminated on one surface of the polarizer 1 (the upper surface in the figure).
- a first cured resin layer 3 is laminated on the surface of the first adhesive layer 2 opposite to the polarizer 1 (the upper surface in the figure).
- a second adhesive layer 4 is laminated on the other surface of the polarizer 1 (the lower surface in the figure).
- a second cured resin layer 5 is laminated on the surface of the second adhesive layer 4 opposite to the polarizer 1 (the lower surface in the figure).
- the first cured resin layer 3 and the second cured resin layer 5 may be the same or different.
- the first adhesive layer 2 and the second adhesive layer 4 may be the same as or different from each other.
- each of the first cured resin layer 2 and the second cured resin layer 4 serves as both a hard coat layer and a protective layer. Thinner.
- each of the cured resin layer and the adhesive layer may have a single layer structure or a laminated structure of two or more layers.
- FIG. 1 (b) Another example of the polarizing plate of the present invention is shown in the sectional view of FIG. 1 (b).
- the same parts as those in FIG. 1 (a) are denoted by the same reference numerals.
- the adhesive layer 2 is laminated on one surface of the polarizer 1 (the upper surface in the figure).
- An adhesive layer 6 is laminated on the other surface of the polarizer 1 (the lower surface in the figure).
- a protective layer 7 is laminated on the surface of the adhesive layer 6 opposite to the polarizer 1 (the lower surface in the figure).
- the cured resin layer 2 serves as both a hard coat layer and a protective layer.
- the polarizing plate 10 is thinned.
- a hard coat layer may be laminated on the surface of the protective layer 7 opposite to the adhesive layer 6 (the lower surface in the figure).
- each of the adhesive layer and the protective layer may have a single layer structure or a laminated structure of two or more layers.
- the polarizing plate of the present invention may have a pressure-sensitive adhesive layer for adhering to another member on at least one surface thereof.
- the surface structure of the cured resin layer may be an uneven structure. If the surface of the cured resin layer is an uneven structure, it has an antiglare (antiglare) function.
- an antireflection layer (low refractive index layer) may be further laminated on the surface of the cured resin layer.
- the thickness of the polarizing plate of the present invention is, for example, in the range of ⁇ to 250 / ⁇ m, preferably in the range of 40 ⁇ m to 200 ⁇ m, and more preferably in the range of 60 ⁇ m to 180 ⁇ m. m range.
- the single transmittance (T) is preferably in the range of 38% to 45%, and the degree of polarization (P) is preferably 98% or more.
- the single transmittance (T) is more preferably in the range of 39% to 44%, and the degree of polarization (P) is more preferably 99% or more.
- the parallel transmittance (HO) is a transmittance value of a parallel laminated polarizing plate produced by superposing two identical polarizing plates so that their absorption axes are parallel to each other.
- the orthogonal transmittance (H90) is a value of the transmittance of an orthogonal laminated polarizing plate produced by superposing two identical polarizing plates so that their absorption axes are orthogonal to each other. Note that these transmittances are Y values obtained by correcting the visibility using the 2 degree field of view (C light source) of J1S Z 8701 (1982 edition).
- the hue a value (single a value) is preferably 2.0 or more.
- the hue b value (single b value) is preferably 4.2 or less.
- the ideal value of the hue a value (single a value) and the hue b value (single b value) is 0.
- the hue a value (single a value) and the hue b value (single b value) are close to 0 and set to numerical values. Vivid display images can be obtained
- the polarizer used in the present invention any appropriate one can be selected as long as the object of the present invention can be achieved.
- the polarizer include, for example, a film obtained by adsorbing a dichroic substance such as iodine or a dichroic dye on a hydrophilic polymer film and uniaxially stretching, a dehydrated polyvinyl alcohol product or a dehydrochlorinated polyvinyl chloride product. And the like, and the like.
- the hydrophilic polymer film include a polybulal alcohol film, a partially formalized polybulal alcohol film, and an ethylene / vinyl acetate copolymer partial ken film.
- a polarizer in which iodine is adsorbed on a poly (vinyl alcohol) film is preferable.
- the thickness of the polarizer is, for example, in the range of 5 ⁇ m to 50 ⁇ m, preferably in the range of 10 to 40 ⁇ m, and more preferably in the range of 20 ⁇ m to 40 ⁇ m. It is.
- the composite elastic modulus (Er) of the polarizer is preferably 6 GPa or more.
- the composite elastic modulus (Er) of the polarizer is more preferably in the range of 8 GPa to 15 GPa, and still more preferably in the range of 9 GPa to 14 GPa.
- the composite elastic modulus (Er) of the polarizer can be appropriately adjusted, for example, by adjusting the moisture content, crosslink density, etc. of the polarizer.
- the content of iodine is, for example, in the range of 2.0 wt% to 5.0 wt% in consideration of optical characteristics. Preferably, it is in the range of 2.0% by weight to 4.0% by weight.
- the polarizer preferably further contains at least one of potassium and boron.
- the potassium content of the polarizer is preferably in the range of 0.2 wt% to 1.0 wt%, and more preferably in the range of 0.3 wt% to 0.9 wt%.
- the boron content of the polarizer is preferably in the range of 0.5 wt% to 3.0 wt%, more preferably 1.0 wt%. The range is from% to 2.8% by weight.
- a film which is a material for forming a polarizer may be immersed in at least one solution of potassium and boron.
- the solution may also serve as a solution containing iodine.
- the polybula alcohol-based resin can be obtained by, for example, squeezing a bull ester-based polymer obtained by polymerizing a bull ester-based monomer.
- the degree of kenning of the polyvinyl alcohol-based resin is preferably in the range of 95 mol% to 99.9 mol% in view of the durability of the polarizer.
- the saponification degree can be determined according to, for example, JIS K 672 6 (1994 edition).
- the average degree of polymerization of the polyvinyl alcohol-based resin is a force that allows an appropriate value to be appropriately selected according to the purpose, and is preferably in the range of 1200 to 3600.
- the average degree of polymerization can be determined according to, for example, JIS K 6726 (1994 edition).
- the polyvinyl alcohol film preferably contains at least one of a plasticizer and a surfactant.
- a plasticizer include polyhydric alcohols such as ethylene glycol and dariserine.
- the surfactant include nonionic surfactants.
- any appropriate forming method may be employed.
- a conventionally known method can be applied as the molding method.
- a commercially available film may be used as it is as the polybulal alcohol film.
- a polymer film (raw film) 301 containing polyvinyl alcohol-based resin as a main component (raw film) 301 is fed from a feeding unit 300, and a swelling bath 310 containing pure water, and a dye containing an aqueous iodine solution.
- Rolls 311, 312, 321 and 322 with different speed ratios are immersed in bath 320. Swelling treatment and dyeing treatment are performed while tension is applied in the longitudinal direction of the lumen.
- the swelled and dyed films are immersed in the first crosslinking bath 330 and the second crosslinking bath 340 containing potassium iodide, and rolls 331, 332, 341 and 342 having different speed ratios are immersed.
- a cross-linking treatment and a final stretching treatment are performed while tension is applied in the longitudinal direction of the film.
- the film subjected to crosslinking treatment is immersed in a washing bath 350 containing pure water by rolls 351 and 352 and subjected to washing treatment.
- the water-washed film is dried by the drying means 360 so that the moisture content is adjusted to, for example, 10% to 30% and wound up by the winding unit 380.
- the polarizer 370 can be obtained by stretching the original film to, for example, 5 to 7 times the original length in these series of steps.
- the polarizer may be subjected to any surface modification treatment in order to improve the adhesion to the adhesive layer.
- the surface modification treatment include corona treatment, plasma treatment, glow discharge treatment, flame treatment, ozone treatment, UV ozone treatment, and ultraviolet treatment. These treatments may be used alone or in combination of two or more.
- the adhesive layer of the present invention has a thickness in the range of 0.1 ⁇ m to 10 m.
- a polarizing plate having excellent adhesion between the polarizer and the cured resin layer and high surface hardness can be obtained.
- the single layer structure may be sufficient as the said adhesive bond layer, and the multilayer structure of two or more layers may be sufficient as it.
- the thickness of the adhesive layer is preferably in the range of 0.1 m to 8 ⁇ m, more preferably in the range of 0.5 m to 6 ⁇ m, and even more preferably 1 ⁇ m to 5 ⁇ m. It is in the range of ⁇ m.
- the composite elastic modulus (Er) of the adhesive layer is preferably 0.05 GPa or more, more preferably in the range of 0.05 GPa to 0.5 GPa, and still more preferably 0. It is in the range of lGPa to 0.3 GPa.
- the adhesive layer can be obtained, for example, by curing an adhesive composition.
- the adhesive composition is a polyurethane resin composition
- the adhesive layer is a cured layer of the polyurethane resin composition.
- the polyurethane resin composition may be a one-component type that cures alone, or is cured into the polyurethane resin composition. It may be a two-component type that is further cured by adding an agent.
- the polyurethane resin composition may be a moisture-curable polyurethane resin composition.
- the adhesive layer using the moisture-curable polyurethane resin composition exhibits good adhesive force to the polarizer surface and the cured resin layer surface. For this reason, if the said moisture hardening type polyurethane resin composition is used for the said adhesive bond layer, peeling of a polarizer and a hardening resin layer can be prevented more suitably.
- the moisture-curable polyurethane resin composition is preferably a one-component type.
- the moisture-curable polyurethane resin composition contains at least polyurethane resin (U1), and preferably contains polyurethane resin (U1) and a solvent.
- the polyurethane resin (U1) can be obtained, for example, by reacting a polyol (a) having a hydroxyl group at the molecular end with a polyisocyanate (b) having an isocyanate group at the molecular end.
- the weight average molecular weight (Mw) of the polyurethane resin (U 1) is preferably 2000 or more, more preferably in the range of 2000 to 15000.
- the moisture curable polyurethane resin composition may contain any additive such as water, solvent, adhesion-imparting agent, antistatic agent, leveling agent, silane coupling agent, and antioxidant depending on the purpose. May be included.
- the amount of the additive is preferably 1 to 10 parts by weight with respect to 100 parts by weight of the total solid content of the moisture-curable polyurethane resin composition.
- the total solid content concentration of the moisture curable polyurethane resin composition is, for example, a heating residue determined according to JIS K 5407.
- the total solid content concentration of the moisture-curable polyurethane resin composition is preferably in the range of 10 wt% to 80 wt%.
- polyol (a) examples include polyester polyol, polyether polyol, polyether polyester polyol, polyester amide polyol, acrylic polyol, polycarbonate polyol, polyhydroxyalkane, and polyurethane polyol. These may be used alone or in combination of two or more.
- Examples of the polyisocyanate (b) include 2, 4 tolylene diisocyanate, 2, 6 Tolylene diisocyanate, 4,4'-dimethanemethane isocyanate, 2,4'-dimethanemethane isocyanate, 1,4 phenolic diisocyanate, 1,5 naphthalene diisocyanate, ethylene
- Examples include diisocyanate, propylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and xylylene diisocyanate. These may be used alone or in combination of two or more.
- the polyurethane resin (U1) preferably has at least a burette group in the molecular structure, and more preferably has at least a hexamethylene diisocyanate 'burette group in the molecular structure.
- the polyurethane resin (U1) having at least the hexamethylene diisocyanate 'burette group is obtained by, for example, modifying a part of hexamethylene diisocyanate with polyamine or water, and It can be obtained by a method in which the reaction is stopped by reacting in the presence and adding a catalyst poison when a predetermined reaction rate is reached.
- the polyurethane resin composition may be an aqueous polyurethane resin composition!
- the “water-based polyurethane resin composition” refers to a resin composition that floats and disperses in water with fine particles of urethane polymer.
- the adhesive layer using the water-based polyurethane resin composition exhibits good adhesion to the polarizer surface and the cured resin surface. For this reason, if the said water-based polyurethane resin composition is used for the said adhesive bond layer, peeling of a polarizer and a hardening resin layer can be prevented more suitably.
- the aqueous polyurethane resin composition is preferably a two-component type used together with a curing agent.
- the aqueous polyurethane resin composition contains at least water and polyurethane resin (U2).
- the polyurethane resin (U2) includes, for example, a polyol (a) having a hydroxyl group at the molecular end, a polyisocyanate (b) having an isocyanate group at the molecular end, an active hydrogen group and a hydrophilic group in the molecular structure. It can be obtained by reacting a compound (c) having a functional group.
- the weight average molecular weight (Mw) of the polyurethane resin (U2) is preferably 3000 or more, and more preferably in the range of 3000-20000.
- the aqueous polyurethane resin composition may contain any additive such as an emulsifier, a surfactant, an adhesive agent, an antistatic agent, a leveling agent, a silane coupling agent, and an antioxidant. Additives may be included.
- the total solid content concentration of the aqueous polyurethane resin composition is, for example, a heating residue determined according to JIS K 5407.
- the total solid content concentration of the aqueous polyurethane resin composition is preferably in the range of 10 wt% to 80 wt%.
- any appropriate compound can be selected as long as it has an active hydrogen group and a hydrophilic group in its molecular structure.
- the active hydrogen group is an active hydrogen group that reacts with an isocyanate group and is, for example, an amino group, a hydroxyl group, a mercapto group, or the like.
- the hydrophilic group is, for example, a ionic group such as a carboxyl group, a sulfonic acid group, a phosphoric acid group, a sulfonate group, an epoxy group, or a polyoxyalkylene group.
- Examples of the compound (c) include 2-oxyethanesulfonic acid, phenolsulfonic acid, sulfobenzoic acid, 5-sulfoisophthalic acid, 2,2-dimethylollactic acid, 2,2-dimethylolacetic acid, dimethylolbutanoic acid, Examples include aminobutane sulfonic acid and 2,3-dihydroxypropyl phenol phosphate. These may be used alone or in combination of two or more.
- the aqueous polyurethane resin composition is a two-component type used together with a curing agent
- any appropriate curing agent can be selected depending on the purpose.
- the curing agent include isocyanate curing agents, epoxy curing agents, melamine curing agents, strong rubodiimide curing agents, oxazoline curing agents, and aziridine curing agents.
- the amount of the curing agent is preferably in the range of 1 to 30 parts by weight with respect to 100 parts by weight of the polyurethane resin (U2).
- the polyurethane resin composition may be an aqueous polyurethane dispersion in which the polyurethane resin composition is dispersed in water.
- the aqueous polyurethane dispersion may be of an external emulsion type in which a polyurethane resin composition is dispersed in water using an external emulsifier.
- a self-emulsifying type in which the polyurethane resin composition is dispersed in water may be used.
- the aqueous polyurethane pasteurgy is of the self-emulsifying type.
- the adhesive layer using the aqueous polyurethane dispersion exhibits good adhesion to the polarizer surface and the cured resin surface. Therefore, if the aqueous polyurethane dispersion is used for the adhesive layer, it is possible to more suitably prevent the polarizer and the cured resin layer from peeling off.
- the method of synthesizing the polyurethane dispersion is not particularly limited, and examples thereof include a solution method, Prebolimer zionomer mixing method, hot melt method, ketimine Z ketazine method and the like.
- the cured resin layer used in the present invention is formed from a photocurable composition containing the component (A) and the component (B).
- the polyfunctional acrylic monomer or polyfunctional methacrylic monomer as the component (A) refers to an acrylic monomer or methacrylic monomer having two or more allyloyl groups or methacrylic groups in the molecular structure.
- the photocurable prepolymer of the component (B) refers to a polymer having a photoreactive functional group in the molecular structure and having 2 or more repeating structural units. The number of repeating structural units is, for example, in the range of 2-20.
- the component (A) and the component (B) may or may not contain unreacted substances remaining without reacting. However, in order to obtain a high surface hardness, it is ideally preferable that the amount of unreacted substances contained in the cured resin layer is smaller.
- the thickness of the cured resin layer increases as the thickness increases. However, if it is too thick, the cured resin layer wrinkles may occur. From the viewpoint of high hardness and crack prevention, it is preferable to set the thickness of the cured resin layer as appropriate.
- the thickness of the cured resin layer is preferably in the range of 10 / ⁇ ⁇ to 40 / ⁇ ⁇ , more preferably in the range of 14 m to 38 ⁇ m, and still more preferably in the range of 18 ⁇ m to The range is 36 ⁇ m.
- the composite elastic modulus (Er) is preferably 4 GPa or more, and the hardness (H) is preferably 400 MPa or more.
- the composite elastic modulus (Er) and the hardness (H) are more preferably in the range of 4 GPa to 8 GPa, still more preferably in the range of 5 GPa to 7 GPa, and the hardness (H) is more preferably in the range of 400 MPa to 800 MPa. More preferably, it is in the range of 500 MPa to 700 MPa.
- the photocurable composition used in the present invention contains a solvent and is of a solventless type. If solvent-free photocurable composition is used, it does not contain solvent, so the base material to be coated It is possible to use a material having a low solvent resistance as a material for the base material without deteriorating the material. In addition, when a hardened resin layer is formed, a solvent drying step is not required, and various problems (whitening, cracking, insufficient curing, etc.) caused by the solvent do not occur. In addition, since the solvent does not evaporate into the atmosphere when the hardened resin layer is formed, there is no environmental pollution caused by the solvent or health problems for workers.
- the polyfunctional acrylic monomer or polyfunctional methanol monomer of the component (A) used in the present invention is used to increase the crosslinking density of the cured resin layer.
- the polyfunctional acrylic monomer or methacrylic monomer is preferably one having 4 to 6 allyloyl groups or methacrylic groups in the molecular structure, and more preferably the allyl monomer or methacrylic monomer of the general formula (I).
- Preferable examples of the general formula (I) include those represented by the following structural formula ( ⁇ ).
- the weight average molecular weight (Mw) of the polyfunctional acrylic monomer or polyfunctional methacrylic monomer is preferably in the range of 250 to 800. By setting the weight average molecular weight (Mw) within the above range, a cured resin layer having excellent surface hardness and small curing shrinkage can be obtained.
- the weight average molecular weight (Mw) is more preferably in the range of 320 to 700, and even more preferably in the range of 400 to 650.
- the polyfunctional acrylic monomer other than those described above may be, for example, dipentaerythritol hexaatalylate, dipentaerythritol pentatalylate, ditrimethylolpropane tetraattalylate, tris (atari mouth kischetil) ) Isocyanurate and the like.
- polyfunctional methacrylic monomers other than those described above include, for example, dipentaerythritol hexamethacrylate, dipentaerythritol pentamethacrylate, ditrimethylolpropane tetramethacrylate, tris (methacryloxychetyl) isocyanurate, etc. Is mentioned.
- These polyfunctional acrylic monomers or polyfunctional meta One kind of kryl monomer may be used alone, or two or more kinds may be used in combination.
- polyfunctional acrylic monomer or polyfunctional methacrylate monomer a commercially available product may be used. Commercial products may be used alone or in combination of two or more commercial products. Examples of the commercially available polyfunctional acrylic monomer or polyfunctional methacrylate monomer include, for example, the product name “ALONIX” series manufactured by Toagosei Co., Ltd., the product name “ALOXETAN” series manufactured by the same company, Nippon Gyaku ( Product name “KAYA RADJ series” manufactured by Co., Ltd.
- the photocurable prepolymer also referred to as photocurable oligomer
- the component (B) is used mainly for improving the film physical properties of the cured resin layer.
- the cured resin layer can be provided with appropriate flexibility, has a hard surface hardness, and excellent adhesion to a polarizer or the like. A hardened resin layer can be obtained.
- the photo-curable prepolymer is not particularly limited, and examples thereof include polyester acrylate, polyester methacrylate, epoxy acrylate, epoxy methacrylate, polyurethane acrylate, and polyurethane methacrylate. . These prepolymers may be used alone or in combination of two or more. Among these prepolymers, polyurethane acrylate and polyurethane metatalylate. Polyurethane acrylate and polyurethane metatalylate have a large molecular weight, so if they are used, the cross-linking density per unit volume of the cured resin layer will be lower, and the curing shrinkage of the cured resin layer will be further suppressed. Can do. As a result, cracks and warpage of the polarizing plate due to the curing shrinkage can be further reduced.
- the weight average molecular weight (Mw) of the photocurable prepolymer is preferably in the range of 250 to 5000, more preferably from the viewpoint of improving the surface hardness of the cured resin layer and preventing curing shrinkage. Is in the range of 300-4000, more preferably in the range of 400-3000.
- the polyurethane attalylate or the polyurethane metatalylate has a urethane bond (one NHCO-) and at least one group of an allyloyl group and a methacrylate group in the molecular structure.
- the polyurethane acrylate or the polyurethane methacrylate can be synthesized, for example, by the following method (a) or (b).
- (a) a polyisocyanate having two or more isocyanate groups, a polyol having two or more hydroxyl groups, a hydroxy acrylate having one or more hydroxyl groups, and a hydroxy having one or more hydroxyl groups React with at least one of the metatalates.
- a polyisocyanate having two or more isocyanate groups is reacted with at least one of a hydroxyatalylate having two or more hydroxyl groups and a hydroxymetatalylate having two or more hydroxyl groups.
- Examples of the polyisocyanate include tetramethylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, 2, 4 tolylene diisocyanate, 4, 4, and diphenyl- Examples include rudiisocyanate, 1,5 naphthalene diisocyanate, and xylene diisocyanate.
- Examples of the polyol include 1,3 butanediol, 1,4 butanediol, trimethylolethane, trimethylolpropane, ditrimethylolethane, dipentaerythritol, and diglycerol.
- hydroxytalylate examples include 2-hydroxyethyl atylate, 4-hydroxycyclohexyl acrylate, 5-hydroxycyclohexyl acrylate, pentaerythritol triacrylate.
- hydroxymetatalylate examples include 2-hydroxyethenoremetatalylate, 4-hydroxycyclohexenoremetatalylate, 5-hydroxycyclooctyl metatalylate, pentaerythritol trimetatalylate, and the like.
- polyurethane acrylate and polyurethane metatalylate may be used as the polyurethane acrylate and polyurethane metatalylate.
- the said commercial item may be used individually by 1 type, and may be used combining two or more types of commercial items.
- Examples of commercially available polyurethane acrylate or polyurethane methacrylate include the product name “Shikou” series manufactured by Nippon Synthetic Chemical Industry Co., Ltd., and the aliphatic urethane acrylate manufactured by Daicel Cytec Co., Ltd. .
- the photocurable composition preferably further contains a reactive diluent which is the component (D).
- a reactive diluent which is the component (D).
- the viscosity of the photocurable composition is applied.
- the cured resin layer having excellent surface uniformity can be obtained by adjusting to a range suitable for the surface.
- a monofunctional to trifunctional low functional group monomer is used as the reactive diluent.
- the low functional group monomer include trimethylolpropane tritalylate, trimethylolpropane trimetatalylate, 1,3 butanediol diatalate, 1,3 butanediol dimetatalylate, 1,4 butanediol diataliate.
- These reactive diluents may be used alone or in combination of two or more.
- the photocurable composition preferably further contains a photopolymerization initiator as the component (C).
- the photopolymerization initiator is preferably used when the cured resin layer is cured by ultraviolet rays, and may be omitted when the cured resin layer is cured by an electron beam.
- the photopolymerization initiator is not particularly limited, and examples thereof include acetophenone-based initiators, benzoin ether-based initiators, benzophenone-based initiators, thixanthone-based initiators, and the like. From the viewpoints of preventing coloring during curing and curing speed, the photopolymerization initiator is preferably a acetophenone-based initiator. Examples of the acetophenone-based initiator include diethoxyacetophenone, benzyl dimethyl ketal, and 1-hydroxycyclohexane.
- a commercial product may be used as the photopolymerization initiator.
- the said commercial item may be used individually by 1 type, and may be used in combination of 2 or more types of commercial items.
- Examples of the commercially available photopolymerization initiator include trade name “IR GACURE” series manufactured by Ciba “Specialty” Chemicals.
- various commercial products of Tokyo Chemical Industry Co., Ltd. can be used as the photopolymerization initiator.
- the blending amount of the photopolymerization initiator is the sum of the components (A) and (B) (A + B) when the component (D) is not used in the photocurable composition.
- it is in the range of 1 to: L0 parts by weight, and more preferably in the range of 2 to 8 parts by weight with respect to 100 parts by weight.
- the total amount of the component (A), the component (B), and the component (D) (A + B + D) is preferably 100 parts by weight. It is the range of L0 weight part, More preferably, it is the range of 2-8 weight part.
- the photocurable composition may contain any appropriate additive!
- the additive include a leveling agent, a matting agent, a sensitizer, an antistatic agent, an antioxidant, a thermal polymerization inhibitor, an adhesion imparting agent, a plasticizer, and a nonreactive polymer.
- the amount of the additive is preferably in the range of more than 0 and not more than 5 parts by weight with respect to 100 parts by weight of the sum of the components (A) and (B) (A + B). .
- the method for producing a polarizing plate of the present invention will be described with examples.
- the polarizing plate of the present invention may be manufactured by a method other than the following example.
- the method for producing the polarizing plate of this example includes the following steps [1] to [6].
- the adhesive composition is applied to the surface of the cured resin layer of the first laminate (R1) to form an adhesive layer having a thickness in the range of 0.1 to 10; ⁇ ⁇ . And obtaining the second laminate (R2)
- the base material is fed out from the first feeding unit 401, and the first coater unit 402 is coated with a solvent-free photocurable composition on the surface of the base material. Is formed (step [1]).
- the base material on which the coating film is formed is sent to an ultraviolet irradiation means 403 provided with a light source 404 and an irradiator 405, where the coating film is irradiated with ultraviolet light and is applied to the surface of the base material.
- a cured resin layer is formed.
- the first laminate (R1) is produced (step [2]).
- an adhesive composition is applied to the surface of the cured resin layer of the first laminate (R1) by the second coater unit 406. Thereafter, it is dried by a drying means 407, an adhesive layer is formed, and a second laminate (R2) is produced (step [3]).
- a separately prepared polarizer is fed out from the second feeding unit 408 (step [4]).
- the polarizer and the second laminate (R2) are laminated such that the adhesive layer of the second laminate (R2) is on the polarizer side, and the third laminate (R3) Is produced (step [5]).
- the base material is peeled off by the third laminated body (R3) (step [6]) and wound up by the first winding unit 409.
- the third laminate (R3) force The polarizing plate obtained by peeling the base material is wound up by the second winding unit 410.
- a manufacturing example of a polarizing plate in which a cured resin layer is laminated on one side of a polarizer is shown.
- the polarizing plate having the configuration shown in FIG. 1A in which the cured resin layer is formed on both surfaces of the polarizer can be produced by, for example, repeating the above method twice. That is, the polarizing plate obtained by the method described above is used so that the second laminate is laminated on the polarizer side.
- the polarizing plate having the configuration shown in FIG. 1 (a) can be obtained by feeding from the second feeding unit 408.
- the polarizing plate 1 (b) has, for example, an arbitrary adhesive layer on the surface opposite to the side where the cured resin layer of the polarizing plate obtained by the above method is laminated. Further, it can be manufactured by laminating a protective layer.
- an electron beam irradiation means may be used instead of the ultraviolet irradiation means.
- the coating film is cured on the substrate. Therefore, even if the coating film is cured and contracted, for example, by selecting a base material that does not generate wrinkles or undulations, a cured resin layer having excellent surface uniformity can be formed. it can.
- the cured resin layer is transferred from the substrate to the polarizer. Therefore, the cured resin surface cured in contact with the surface of the substrate (that is, without being subjected to oxygen inhibition) can be laminated so as to face the outside of the polarizing plate. As a result, a polarizing plate having higher surface hardness can be obtained.
- Examples of the coating method of the solventless photocurable composition and the adhesive composition include a coating method using a coater.
- the coater include, for example, a reverse roll coater, a forward rotary roll coater, a gravure coater, a knife coater, a rod coater, a slot die coater, a slot orifice coater, a curtain coater, a fountain coater, an air doctor coater, a kiss coater, a dip coater, a bead coater, and a blade coater.
- the coater is preferably a reverse roll coater, a forward rotation roll coater, a gravure coater, a rod coater, a slot die coater, a slot orifice coater, a curtain coater, and a fountain coater.
- the coater is preferably a coater head using a closed applicator in order to prevent changes in the concentration of the coating solution. If it is the coating system using the said coater, a cured resin layer with small thickness variation can be obtained and it is preferable.
- Examples of the substrate include a metal belt, a glass plate, a polyethylene terephthalate film, a polycarbonate film, a triacetyl cellulose film, a norbornene film, a polyester film, and a polystyrene film.
- the surface of the substrate on which the solventless photocurable composition is applied may be subjected to a peeling treatment.
- the ultraviolet irradiation means includes, for example, a light source, an irradiator, a cooling device, and a power supply device.
- Examples of the light source include a high-pressure mercury lamp, an ozone-less mercury lamp, a xenon lamp, a fusion lamp, and a metal halide lamp.
- the wavelength of the light source can be appropriately selected in consideration of the curing time, the penetration depth of ultraviolet rays, and the like.
- the wavelength of the light source is, for example, in the range of 100 nm to 400 nm, and preferably in the range of 210 nm to 380 nm.
- the cumulative amount of irradiation light is preferably in the range of 50 mjZcm 2 to 1000 mjZcm 2.
- the irradiator preferably includes a filter (for example, a heat ray cut filter) for cutting off wavelengths of infrared rays and visible rays in order to reduce thermal damage to the polarizer.
- the cooling device and the power supply device are used for keeping the temperature of the light source and the entire irradiator constant and lighting the light source stably. Examples of the cooling device include cooling devices such as an air cooling (exhaust air or air supply / exhaust) method and a water cooling method.
- Examples of the electron beam irradiation means include various electron beam irradiation means such as a scanning method, an area beam method, and a self-shielding method.
- the electron beam irradiation means preferably includes an electron beam irradiation tube, an irradiation head, and a power supply device.
- the output of the electron beam irradiation means is, for example, in the range of 50 kV to: LOOOkV.
- the “protective layer” is formed separately from the cured resin layer.
- the cured resin layer of the polarizer is formed. It is formed through an optional adhesive layer on the opposite surface and the opposite surface, and is an optional component.
- cellulose-based resin such as TAC or norbornene-based resin is preferably used.
- Commercially available products of these resin films include, for example, the product name “Fujitac” manufactured by Fuji Photo Film Co., Ltd., the product name “Zeonor” manufactured by Nippon Zeon Co., Ltd., and the product name manufactured by JSR Co., Ltd. “Arton” and so on.
- the thickness of the protective layer can be determined as appropriate, but from the viewpoint of workability such as strength and handleability, and viewpoints such as thinning, it is in the range of 1 ⁇ m to 500 ⁇ m. Preferably, it is in the range of 5 ⁇ m to 200 ⁇ m, more preferably in the range of 10 ⁇ m to 150 ⁇ m.
- Phase of the protective layer As the difference value, the in-plane retardation value (Re) ⁇ Preferably, ⁇ ! It is in the range of ⁇ 5 nm, more preferably in the range of Onm to 3 nm, further preferably in the range of Onm to 1 nm, and the retardation value (Rth) force in the thickness direction, preferably ⁇ ⁇ ! It is in the range of ⁇ 15 nm, more preferably in the range of 0 nm to 12 nm, further preferably in the range of Onm to 5 nm, and most preferably in the range of Onm to 3 nm.
- Examples of the adhesive used for the adhesive layer include an adhesive made of an acrylic polymer or a vinyl alcohol polymer.
- the adhesive is preferably an adhesive having a bull alcohol-based polymer strength from the viewpoint of adhesive strength with a polarizer.
- the adhesive may contain a water-soluble crosslinking agent of a butyl alcohol polymer such as boric acid, borax, dartalaldehyde, melamine, or oxalic acid.
- the adhesive can exhibit sufficient adhesive force even as a thin layer having excellent transparency and low birefringence.
- an adhesive for dry lamination, a styrene butadiene rubber adhesive, an epoxy two-component curable adhesive (a mixture of a polyurethane resin solution and a polyisocyanate resin solution (for example, epoxy resin and polythiol can be used as a two-component, epoxy resin and polyamide can be used as a two-component, and solvent type adhesives and epoxy two-part curable adhesives are particularly suitable. I like it.
- Some adhesives can improve the adhesive force by using an appropriate adhesive primer. When such an adhesive is used, the adhesive primer can be used. I like it!
- the polarizing plate of the present invention when used by being laminated on a liquid crystal cell, for example, it is preferable to provide an adhesive layer on the surface of the polarizing plate. This facilitates the lamination of the polarizing plate of the present invention on the liquid crystal cell.
- the pressure-sensitive adhesive is not particularly limited, and examples thereof include acrylic polymers, silicone-based polymers, polyesters, polyurethanes, polyamides, polybutyl ethers, and butyl acetates.
- Z-salt / bulb copolymer modified polyolefin, epoxy-based, fluorine-based, natural rubber, synthetic rubber, etc. Can do.
- an acrylic pressure-sensitive adhesive is preferably used because of its excellent optical transparency, moderate wettability, cohesiveness, and adhesiveness, and excellent weather resistance and heat resistance.
- the polarizing plate of the present invention can be preferably used for various image display devices such as a liquid crystal display device (LCD) and an EL display (ELD).
- the liquid crystal display device of the present invention has the same configuration as the conventional liquid crystal display device except that the polarizing plate of the present invention is used.
- the liquid crystal display device of the present invention includes, for example, a liquid crystal cell, an optical member such as a polarizing plate of the present invention, and each component such as an illumination system (backlight or the like) as needed, and incorporates a drive circuit. It can manufacture by.
- the configuration of the liquid crystal display device is not particularly limited, and the liquid crystal display device in which an optical member such as the polarizing plate of the present invention is disposed on one side or both sides of the liquid crystal cell, or an illumination system.
- examples thereof include a liquid crystal display device using a backlight or a reflector.
- optical members such as the polarizing plate of the present invention are arranged on both sides of the liquid crystal cell, they may be the same or different.
- optical members and optical components such as a diffusion plate, an anti-damper layer, an antireflection layer, a protective plate, a prism array, and a lens array sheet may be disposed.
- the image display device of the present invention is used for any appropriate application.
- Applications include, for example, OA devices such as desktop computers, notebook computers, and copy machines, mobile phones, watches, digital cameras, personal digital assistants (PDAs), portable devices such as portable game consoles, video cameras, televisions, and electronic devices.
- Household electrical equipment such as microwave ovens, knock monitors, monitors for car navigation systems, in-vehicle equipment such as car audio, display equipment such as information motors for commercial stores, security equipment such as surveillance monitors, nursing care monitors Medical monitors such as first-class nursing care devices.
- Thickness measurement method When the thickness was less than 10 m, the thickness of the cross section was determined by using FE SEM [manufactured by Hitachi, Ltd., product name “S-4000” (acceleration voltage: 3 kV)]. When the thickness was 10 / zm or more, measurement was performed using an Anritsu digital micrometer “KC-351C type”. The sample used for measuring the cross-sectional thickness was prepared by cutting a small piece of polarizing plate with an ultramicrotome.
- the content of each element was determined from a calibration curve prepared in advance using a standard sample from the X-ray intensity measured on a circular sample with a diameter of 10 mm under the following conditions by fluorescent X-ray analysis.
- the pencil pull value on the cured resin layer surface of the polarizing plate was determined by a test method according to JIS K 5400 (1990 edition).
- Polyethylene terephthalate film (thickness 75 m, manufactured by Toray Industries, Inc. 7-E "] was coated on one surface with a bar coater (No. 16) using a solvent-free photocurable composition of the following yarn and composition to form a coating film. Thereafter, the coating film was irradiated with ultraviolet light having a wavelength of 365 nm using a high-pressure mercury lamp so that the integrated light amount was 300 mjZcm 2 to form a cured resin layer having a thickness of 22 / zm. A laminate (R1) was produced.
- Component (B) Polyurethane acrylate (made by Nippon Synthetic Chemical Industry Co., Ltd., trade name “purple light UV-7600B”) 5 parts by weight
- Ingredient (C) 1 part by weight of 1 hydroxycyclohexyl phenol ketone (Ciba 'Specialty Chemicals, trade name “Irgacure 184”)
- Component (D) Tetrahydrofurfuryl attalylate (Wako Pure Chemical Industries, Ltd.) 21 parts by weight
- an adhesive composition having the following composition was applied to the surface of the cured resin layer of the first laminate (R1) with a bar coater (No. 3), and air circulation at 100 ° C was performed.
- An adhesive layer having a thickness of 0.7 m was formed by drying in a dry oven for 3 minutes. In this way, a second laminate (R2) was obtained.
- 1-component moisture-curing polyurethane resin composition (containing urethane resin containing a burette group in the molecular structure, manufactured by Mitsui Chemicals Polyurethanes Co., Ltd., trade name “MT—Orestar NM89-50 GJ”) Diluted solution diluted 2-fold with
- Dyeing bath An aqueous solution at 30 ° C. containing 0.03 parts by weight of iodine for 100 parts by weight of water and 0.2 parts by weight of potassium iodide for 100 parts by weight of water.
- First cross-linking bath 40 ° C. aqueous solution containing 3% by weight potassium iodide and 3% by weight boric acid.
- Second crosslinking bath 60 ° C. aqueous solution containing 5% by weight potassium iodide and 4% by weight boric acid.
- Washing bath 25 ° C aqueous solution containing 3% by weight potassium iodide.
- the second laminate (R2) and the polarizer were laminated so that the adhesive layer was on the polarizer side.
- a triacetyl cellulose film (trade name “ZRF80S” manufactured by Fuji Photo Film Co., Ltd.) having a thickness of 80 m is provided. It was laminated via a water-soluble adhesive (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name “GOHS Eimer Z200”) mainly composed of 1 ⁇ m polybulal alcoholic resin. In this way, a third laminate (R3) was produced.
- This polarizing plate had a single transmittance of 41.1% and a polarization degree of 99.9%.
- the hardness (H) of the cured resin layer of this polarizing plate was 5 41 MPa.
- Table 1 The properties of this polarizing plate are shown in Table 1 below.
- the polarizing plate of this example was prepared in the same manner as in Example 1 except that the adhesive composition was applied with a bar coater (No. 10) to form an adhesive layer having a thickness of 2 m. Produced.
- the characteristics of this polarizing plate are shown in Table 1 above.
- a polarizing plate of this example was produced in the same manner as in Example 1. The properties of this polarizing plate are shown in Table 1 above.
- Component (A) Acrylic monomer represented by the structural formula (ii) (Daicel Cytec Co., Ltd., trade name “DPHA”) 12 parts by weight
- Component (B) Aliphatic urethane acrylate (Daicel Cytec Co., Ltd., trade name “PETI A”) 16 parts by weight
- Component (C) Urethane acrylate (Nippon Synthetic Chemical Industry Co., Ltd., trade name “purple UV— 764 0B”) 24 parts by weight
- Component (D): Metatalylate polymer (manufactured by Toagosei Co., Ltd., trade name ⁇ ALONIX M9050J, Mw 3000) 14 parts by weight
- Aqueous polyurethane dispersion made by Daiichi Kogyo Seiyaku Co., Ltd., trade name "Superflex 4
- the polarizing plate of this example was prepared in the same manner as in Example 3 except that the adhesive composition was applied with a bar coater (No. 6) to form an adhesive layer having a thickness of 4 m. Produced.
- the characteristics of this polarizing plate are shown in Table 1 above.
- the polarizing plate of this example was prepared in the same manner as in Example 3 except that the adhesive composition was applied with a bar coater (# 10) to form an adhesive layer having a thickness of 8 m. Produced. The characteristics of this polarizing plate are shown in Table 1 above. [0130] (Example 6)
- Example 3 This example is the same as Example 3 except that the solventless photocurable composition was applied with a bar coater (No. 30) to form a cured resin layer having a thickness of 27 m.
- a polarizing plate was prepared. The properties of this polarizing plate are shown in Table 1 above.
- the solvent-free photocurable composition was applied with a bar coater (No. 30) to form a cured resin layer having a thickness of 27 m, and the adhesive composition was applied with a bar coater (No. 6).
- a polarizing plate of this example was produced in the same manner as in Example 3 except that an adhesive layer having a thickness of 4 m was formed.
- the properties of this polarizing plate are shown in Table 1 above.
- the solvent-free photocurable composition was applied with a bar coater (No. 30) to form a cured resin layer having a thickness of 27 m, and the adhesive composition was applied with a bar coater (No. 10).
- a polarizing plate of this example was produced in the same manner as in Example 3 except that an adhesive layer having a thickness of 8 m was formed.
- the properties of this polarizing plate are shown in Table 1 above.
- the present embodiment was carried out in the same manner as in Example 3 except that the solventless photocurable composition was applied with a bar coater (No. 40) to form a cured resin layer having a thickness of 35 ⁇ m.
- An example polarizing plate was produced. The properties of this polarizing plate are shown in Table 1 above.
- the solvent-free photocurable composition was coated with a bar coater (No. 40) to form a cured resin layer having a thickness of 35 ⁇ m, and the adhesive composition was coated with a bar coater (6
- the polarizing plate of this example was produced in the same manner as in Example 3 except that the adhesive layer having a thickness of 4 m was formed.
- the properties of this polarizing plate are shown in Table 1 above.
- the solvent-free photocurable composition was coated with a bar coater (No. 40) to form a cured resin layer having a thickness of 35 ⁇ m, and the adhesive composition was coated with a bar coater (10
- the polarizing plate of this example was produced in the same manner as in Example 3, except that an adhesive layer having a thickness of 8 m was formed. The properties of this polarizing plate are shown in Table 1 above. [0136] (Comparative Example 1)
- the one-component moisture-curable polyurethane resin composition was used without being diluted, and it was applied with a bar coater (No. 18) to form an adhesive layer having a thickness of 14 m.
- a polarizing plate of this comparative example was produced in the same manner as in Example 1 except that was formed. The properties of this polarizing plate are shown in Table 1 above.
- the one-component moisture-curable polyurethane resin composition was used without being diluted, and it was applied with a bar coater (No. 20) to form an adhesive layer having a thickness of 17 m.
- a polarizing plate of this comparative example was produced in the same manner as in Example 1 except that was formed. The properties of this polarizing plate are shown in Table 1 above.
- a polarizing plate of this example was produced in the same manner as in Example 3 except that the adhesive composition was applied with a bar coater (No. 20) to form an adhesive layer having a thickness of 15 m. did.
- the properties of this polarizing plate are shown in Table 1 above.
- the solvent-free photocurable composition was coated with a bar coater (# 30) to form a cured resin layer having a thickness of 27 m, and the adhesive composition was coated with a bar coater (# 20).
- a polarizing plate of this example was produced in the same manner as in Example 3 except that an adhesive layer having a thickness of 15 m was formed.
- the properties of this polarizing plate are shown in Table 1 above.
- the solvent-free photocurable composition was coated with a bar coater (No. 40) to form a cured resin layer having a thickness of 35 ⁇ m, and the adhesive composition was coated with a bar coater (20
- the polarizing plate of this example was produced in the same manner as in Example 3, except that the adhesive layer having a thickness of 15 m was formed.
- the properties of this polarizing plate are shown in Table 1 above. [0142] (Evaluation)
- the polarizing plates shown in Examples 1 to 11 were prepared by polarizing a cured resin layer formed from a solventless photocurable composition through an adhesive layer having a thickness in the range of 0.1 ⁇ m to 10 m. It is stacked on the child. These polarizing plates showed much higher surface hardness (pencil hardness: 9H) than conventional polarizing plates.
- the polarizing plates shown in Comparative Examples 1 to 6 are obtained by laminating a cured resin layer on a polarizer via an adhesive layer having a thickness exceeding 10 m. These polarizing plates had a considerably lower surface hardness than that of the examples (pencil hardness: H to 7H).
- the polarizing plate of the present invention is excellent in polarization characteristics, exhibits a significantly higher surface hardness than a conventional polarizing plate, and can be reduced in thickness. Therefore, if the polarizing plate of the present invention is used, it is extremely effective for preventing scratches at the time of assembling or using the liquid crystal display device, for example, and the image display device such as a liquid crystal display device can be thinned. Is also possible.
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Abstract
Description
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/294,539 US7911564B2 (en) | 2006-06-15 | 2007-06-06 | Polarizing plate, image display, and method of manufacturing polarizing plate |
CN2007800029898A CN101371173B (zh) | 2006-06-15 | 2007-06-06 | 偏振片、图象显示器、及制造偏振片的方法 |
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JP2006-166124 | 2006-06-15 | ||
JP2006166124 | 2006-06-15 | ||
JP2007148536A JP5009690B2 (ja) | 2006-06-15 | 2007-06-04 | 偏光板、画像表示装置および偏光板の製造方法 |
JP2007-148536 | 2007-06-04 |
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US (1) | US7911564B2 (ja) |
JP (1) | JP5009690B2 (ja) |
KR (1) | KR20080080528A (ja) |
CN (1) | CN101371173B (ja) |
TW (1) | TWI357989B (ja) |
WO (1) | WO2007145111A1 (ja) |
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- 2007-06-06 CN CN2007800029898A patent/CN101371173B/zh not_active Expired - Fee Related
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Also Published As
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CN101371173A (zh) | 2009-02-18 |
US7911564B2 (en) | 2011-03-22 |
KR20080080528A (ko) | 2008-09-04 |
US20100238383A1 (en) | 2010-09-23 |
TWI357989B (en) | 2012-02-11 |
TW200808545A (en) | 2008-02-16 |
JP5009690B2 (ja) | 2012-08-22 |
CN101371173B (zh) | 2011-04-13 |
JP2008020891A (ja) | 2008-01-31 |
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