WO2020153233A1 - 積層体、偏光板、積層体の製造方法、偏光板の製造方法及び表示装置の製造方法 - Google Patents

積層体、偏光板、積層体の製造方法、偏光板の製造方法及び表示装置の製造方法 Download PDF

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Publication number
WO2020153233A1
WO2020153233A1 PCT/JP2020/001372 JP2020001372W WO2020153233A1 WO 2020153233 A1 WO2020153233 A1 WO 2020153233A1 JP 2020001372 W JP2020001372 W JP 2020001372W WO 2020153233 A1 WO2020153233 A1 WO 2020153233A1
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Prior art keywords
laminate
polarizing plate
film
stretching
material film
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PCT/JP2020/001372
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English (en)
French (fr)
Japanese (ja)
Inventor
啓 眞島
貴道 猪股
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日本ゼオン株式会社
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Application filed by 日本ゼオン株式会社 filed Critical 日本ゼオン株式会社
Priority to KR1020217021796A priority Critical patent/KR20210118823A/ko
Priority to CN202080008644.9A priority patent/CN113272114B/zh
Priority to JP2020568109A priority patent/JP7484728B2/ja
Publication of WO2020153233A1 publication Critical patent/WO2020153233A1/ja

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/02—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by a sequence of laminating steps, e.g. by adding new layers at consecutive laminating stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • 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
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources

Definitions

  • the present invention relates to a laminate, a polarizing plate, a method for producing a laminate, a method for producing a polarizing plate, and a method for producing a display device.
  • a display device such as a liquid crystal display device and an organic electroluminescence (EL) display device
  • a display device having a large display area, a light weight, and a thin thickness has been conventionally required. Therefore, a thin panel has been conventionally required for the display device.
  • a polarizing plate including a polarizer and a protective film that protects the polarizer is generally used for a display device.
  • thinner polarizing plates are required.
  • the polarizer may shrink in a use environment of the display device, warpage due to such shrinkage may be a problem in a thin display device having a large area. Therefore, by adopting a thin polarizer having a thickness of 10 ⁇ m or less, it is possible to expect not only the reduction of the thickness of the polarizer itself but also the reduction of the warpage as described above.
  • Patent Document 1 an unstretched polyvinyl alcohol-based film is attached to a base film made of unstretched high-density polyethylene to form a laminate, and the laminate is stretched, and then the base film is peeled off to form a polyvinyl film.
  • a method for obtaining an alcohol-based film has been proposed.
  • the resin layer can also be used as a protective film, can be efficiently produced even if the thickness is thin, and a laminate and a method for producing the same, which prevents the generation of wrinkles and voids, It is an object of the present invention to provide a polarizing plate using a laminate, a method for manufacturing the same, and a method for manufacturing a display device using the polarizing plate.
  • the present inventor has a polarizer material film having a predetermined retardation and a predetermined thickness, and a resin layer provided directly on the polarizer material film.
  • the present invention was completed by finding that the above problems can be solved by using a laminate. Therefore, according to the present invention, the following [1] to [21] are provided.
  • [1] A laminate having a polarizer material film and a resin layer directly provided on the polarizer material film, The retardation Re1 in the in-plane direction of the polarizer material film is larger than 50 nm, A laminate in which the thickness T1 of the polarizer material film is 45 ⁇ m or less.
  • the cycloolefin resin contains a cycloolefin polymer
  • the cycloolefin polymer is a polymer block [A] containing a repeating unit [I] derived from an aromatic vinyl compound as a main component, A polymer block [B] containing a repeating unit [I] derived from an aromatic vinyl compound and a repeating unit [II] derived from a chain conjugated diene compound as a main component, or a repeating unit [II] derived from a chain conjugated diene compound
  • the laminate according to [7] which is a block copolymer hydride obtained by hydrogenating a block copolymer [D] consisting of a polymer block [C] as a main component.
  • the resin layer is a layer made of resin,
  • the resin has a melt flow rate of 1 g/10 minutes or more and a tensile modulus E of 50 MPa or more and 1200 MPa or less,
  • the plasticizer, the softening agent, or both of them are one or more selected from ester plasticizers and aliphatic hydrocarbon polymers.
  • a polarizing plate which is the uniaxially stretched product of the laminate according to any one of [1] to [12].
  • [16] The method for producing a laminate according to [14] or [15], including a fourth step of activating the surface of the polarizer material film before the second step.
  • a method for manufacturing a polarizing plate comprising: A step of preparing the laminate according to any one of [1] to [12], or a step of producing the laminate by the method for producing a laminate according to any one of [14] to [16] When, A fifth step of dyeing the laminate with a dichroic dye, A sixth step of uniaxially stretching the laminate, and a method for producing a polarizing plate.
  • the method for producing a polarizing plate according to [17] wherein the stretching ratio in the sixth step is Z and Z satisfies 1.2 ⁇ Z ⁇ 5.0.
  • a method of manufacturing a display device comprising: [17] to a step of manufacturing a polarizing plate by the method for manufacturing a polarizing plate according to any one of [20], and an eighth step of laminating the polarizing plate on a panel,
  • the panel is a panel selected from a liquid crystal panel, an organic electroluminescence panel, and a micro LED panel.
  • the resin layer can also be used as a protective film, can be efficiently produced even if the thickness is thin, and prevent the generation of wrinkles and voids, a laminate and a method for producing the same, A polarizing plate using the laminate and a method for manufacturing the same, and a method for manufacturing a display device using the polarizing plate can be provided.
  • FIG. 1 is a cross-sectional view schematically showing the laminated body according to the first embodiment.
  • FIG. 2 is a schematic diagram schematically showing an example of a manufacturing apparatus used in the method for manufacturing a laminated body according to the first embodiment.
  • FIG. 3 is a schematic view schematically showing an example of a manufacturing apparatus used in the method for manufacturing the polarizing plate according to the first embodiment.
  • FIG. 4 is a cross-sectional view schematically showing a polarizing plate manufactured using the laminated body according to the first embodiment.
  • FIG. 5 is a sectional view schematically showing a polarizing plate manufactured by the method for manufacturing a polarizing plate according to the second embodiment.
  • FIG. 6 is a sectional view schematically showing a display device manufactured by the method for manufacturing a display device according to the third embodiment.
  • FIG. 7 is a sectional view schematically showing a display device manufactured by the method for manufacturing a display device according to the fourth embodiment.
  • the “long film” means a film having a length of 5 times or more, preferably 10 times or more, specifically, a roll, with respect to the width of the film. It has a length that allows it to be wound up into a shape and stored or transported.
  • the upper limit of the ratio of the length to the width of the film is not particularly limited, but may be 100,000 times or less, for example.
  • the Nz coefficient of the film is a value represented by [(nx-nz)/(nx-ny)] and may be represented as [(Rth/Re)+0.5].
  • nx is a refractive index in the in-plane slow axis direction of the film (maximum in-plane refractive index)
  • ny is a refractive index in the in-plane direction perpendicular to the in-plane slow axis of the film.
  • nz is the refractive index in the thickness direction of the film
  • d is the thickness (nm) of the film.
  • the measurement wavelength is 550 nm which is a typical wavelength in the visible light region.
  • Embodiment 1 Laminate and its manufacturing method, polarizing plate and its manufacturing method
  • a laminated body and a manufacturing method thereof according to Embodiment 1 which is one embodiment of the present invention, and a polarizing plate using the laminated body and a manufacturing method thereof will be described with reference to FIGS. 1 to 4.
  • the laminate of the present invention has a polarizer material film and a resin layer directly provided on the polarizer material film.
  • the in-plane retardation Re1 of the polarizer material film is larger than 50 nm, and the thickness T1 of the polarizer material film is 45 ⁇ m or less.
  • the “resin layer” is a layer different from the polarizer material film.
  • the “resin layer directly provided on the polarizer material film” is provided on the surface of the layer of the material forming the polarizer material film, and as a result, directly on the surface of the polarizer material film.
  • the resin layer is in contact with the resin layer.
  • FIG. 1 is an example of a cross-sectional view schematically showing a laminated body 10 of Embodiment 1 according to the present invention.
  • the laminated body 10 of the present embodiment includes a polarizer material film 11 and a resin layer 12 provided on one surface (the upper side surface in the drawing) of the polarizer material film 11.
  • the laminated body 10 of the present invention is a material for producing a polarizer and a polarizing plate including the polarizer.
  • the polarizer material film is a film for producing a polarizer (film for a polarizer).
  • the polarizer material film is a film having a retardation Re1 in the in-plane direction of more than 50 nm and a thickness T1 of 45 ⁇ m or less.
  • the polarizer material film can be obtained by subjecting an unstretched film containing a polarizer material to a stretching treatment such that the in-plane retardation Re1 is larger than 50 nm and the thickness T1 is 45 ⁇ m or less.
  • the polarizer material film is a (stretched) film containing the material of the polarizer.
  • a film for obtaining a polarizer material film which has not been subjected to a stretching treatment for obtaining a predetermined retardation and thickness (an unstretched film containing a polarizer material), The original film”.
  • the raw film includes a material for the polarizer.
  • the raw film is not necessarily limited as long as it can achieve the object of the present invention, but a polyvinyl alcohol resin film is preferable from the viewpoint of high cost performance.
  • the polyvinyl alcohol resin film (hereinafter sometimes referred to as “PVA resin film”) that can be used as the raw film is not necessarily limited, but polyacetic acid obtained by polymerizing vinyl acetate due to availability and the like. It is preferable to use the one produced by saponifying vinyl.
  • the polyvinyl alcohol contained in the PVA resin film (hereinafter sometimes referred to as “PVA”) has a degree of polymerization of 500 to 8000 from the viewpoint of excellent stretchability and polarization performance of the obtained polarizer.
  • the degree of saponification is preferably 90 mol% or more.
  • the degree of polymerization is an average degree of polymerization measured according to the description of JIS K6726-1994, and the degree of saponification is a value measured according to the description of JIS K6726-1994.
  • the more preferable range of the degree of polymerization is 1000 to 6000, and more preferably 1500 to 4000.
  • the more preferable range of the degree of saponification is 95 mol% or more, and more preferably 99 mol% or more.
  • PVA may be a copolymer with another monomer copolymerizable with vinyl acetate, or a graft polymer.
  • the method for producing the PVA resin film that can be used as the raw film is not particularly limited, and the PVA resin film can be produced by any method such as a known method.
  • the manufacturing method include a casting film-forming method, a wet film-forming method (discharging into a poor solvent), a dry-wet film-forming method, and a gel film-forming method, in which a PVA solution obtained by dissolving PVA in a solvent is used as a film-forming stock solution.
  • the method (a method in which the PVA aqueous solution is once cooled and gelled, and then the solvent is extracted and removed to obtain a PVA resin film), and a method using a combination thereof are included.
  • a further example of the manufacturing method is a melt extrusion film forming method in which a PVA containing a solvent is melted and used as a film forming stock solution.
  • the cast film forming method and the melt extrusion film forming method are preferable because a PVA resin film having high transparency and little coloring can be obtained, and the melt extrusion film forming method is preferable because a high film forming rate can be obtained. More preferable.
  • the PVA resin film that can be used as the raw film is a PVA containing a plasticizer such as polyhydric alcohol such as glycerin in order to improve mechanical properties and process passability during secondary processing. It is preferable to contain 0.01 to 30% by weight, and in order to improve the handling property and the film appearance, a surfactant such as an anionic surfactant or a nonionic surfactant is added to PVA in an amount of 0.01 to 30% by weight. It is preferably contained in an amount of up to 1% by weight.
  • a plasticizer such as polyhydric alcohol such as glycerin
  • a surfactant such as an anionic surfactant or a nonionic surfactant is added to PVA in an amount of 0.01 to 30% by weight. It is preferably contained in an amount of up to 1% by weight.
  • the PVA resin film that can be used as the raw film is, if necessary, an antioxidant, an ultraviolet absorber, a lubricant, a pH adjusting agent, inorganic fine particles, a coloring agent, an antiseptic agent, a fungicide, and other than the above-mentioned components. It may further contain an optional component such as a polymer compound and water.
  • the PVA resin film may include one or more of the above optional components.
  • the thickness of the raw film is preferably 60 ⁇ m or less, more preferably 45 ⁇ m or less, further preferably 30 ⁇ m or less, preferably 10 ⁇ m or more, more preferably 15 ⁇ m or more, still more preferably 20 ⁇ m or more.
  • the thickness of the original film can obtain a polarizing plate having a sufficiently high degree of polarization when it is at least the lower limit of the above range, and when it is at most the upper limit of the above range, the resistance to bending of the polarizing plate is effective. Can be increased.
  • the polarizer material film may be a film obtained by stretching.
  • the polarizer material film can be obtained by subjecting the original film to a stretching treatment.
  • the stretching method include dry stretching and wet stretching. Since equipment and processes for dry stretching are simpler than those for wet stretching, the polarizer material film is preferably one obtained by dry stretching.
  • stretching methods such as tenter stretching, float stretching and hot roll stretching can be used.
  • the dry stretching refers to a stretching treatment method of stretching in a gas atmosphere at a high temperature (for example, 100° C. or higher). Air is mentioned as a gas used in the dry stretching.
  • the stretching conditions when the raw film is stretched to form a polarizer material film can be appropriately selected so as to obtain a desired polarizer material film.
  • the stretching mode when the raw film is stretched into a polarizer material film may be any mode such as uniaxial stretching and biaxial stretching.
  • the stretching direction is the longitudinal direction (direction parallel to the longitudinal direction of the long film) and the transverse direction (parallel to the width direction of the long film).
  • Direction and an oblique direction (direction not vertical or horizontal).
  • the polarizer material film may be a film stretched at a draw ratio of X times. It is preferable that X satisfies 1.5 ⁇ X ⁇ 5.5. Such a polarizer material film can be obtained by stretching a raw film at a stretching ratio of X times.
  • X is preferably 1.5 or more, more preferably 2.0 or more, even more preferably 2.5 or more, preferably 5.5 or less, more preferably 4.5 or less, and further preferably It is 3.5 or less. That is, the polarizer material film is preferably a film stretched at a draw ratio of 1.5 times or more and 5.5 times or less, and a film stretched at a draw ratio of 2.0 times or more and 4.5 times or less.
  • the film is stretched at a stretch ratio of 2.5 to 3.5.
  • X is not more than the upper limit of the above range, it is possible to prevent breakage when the raw film is stretched to obtain a polarizer material film.
  • X is not less than the lower limit of the above range, the stretching ratio when stretching the laminate to obtain a polarizing plate can be lowered.
  • the stretching ratio X is the product of the respective stretching ratios.
  • the stretching temperature when dry-stretching the raw fabric film to form a polarizer material film is preferably 100° C. or higher, more preferably 110° C. or higher, while preferably 150° C. or lower, more preferably 140° C. or lower. ..
  • a polarizer material film having a uniform thickness can be obtained.
  • the polarizer material film is preferably a PVA resin film.
  • a film having a transmittance of light having a wavelength of 550 nm (hereinafter, “the transmittance of light having a wavelength of 550 nm” is also referred to as “light transmittance”) is 50% or more is preferable. ..
  • An uncolored film can be used as the PVA resin film.
  • the light transmittance of such a PVA resin film is preferably 55% or more, more preferably 60% or more, preferably 99% or less, more preferably 97% or less.
  • the thickness T1 of the polarizer material film is preferably 45 ⁇ m or less, more preferably 35 ⁇ m or less, further preferably 25 ⁇ m or less, preferably 5 ⁇ m or more, more preferably 7 ⁇ m or more, still more preferably 10 ⁇ m or more.
  • the thickness of the polarizer material film can effectively reduce the shrinkage force of the polarizing plate by being equal to or less than the upper limit of the above range, and the polarizing plate having a sufficiently high degree of polarization by being equal to or more than the lower limit of the above range.
  • the board can be obtained.
  • the retardation Re1 in the in-plane direction of the polarizer material film is preferably 50 nm or more, more preferably more than 50 nm, even more preferably 100 nm or more, particularly preferably 150 nm or more, preferably 1500 nm or less, more preferably 1000 nm or less. Is.
  • the retardation Re1 in the in-plane direction of the polarizer material film is not less than the lower limit value of the above range, the stretching ratio when the laminate is stretched to form a polarizing plate is kept low, and the resin layer after the stretching treatment is performed. The phase difference can be kept low.
  • the shape and dimensions of the polarizer material film can be appropriately adjusted according to the desired application. From the viewpoint of production efficiency, the polarizer material film is preferably a long film.
  • the resin layer is a layer made of resin.
  • the resin layer may be a resin layer provided by applying a resin to the polarizer material film.
  • the resin layer may be provided by directly thermocompressing a film-shaped resin on the polarizer material film. “Direct thermocompression bonding” on the polarizer material film means that a film material that becomes the polarizer material film and the resin layer is formed between the polarizer material film and the resin layer without interposing an adhesive or an adhesive. It means to press-bond with resin.
  • the resin forming the resin layer is preferably a resin having flexibility that allows it to be stretched at a low stretching temperature (for example, 50 to 120° C.) and a high stretching ratio (for example, 6.0 times).
  • a resin include a cycloolefin-based resin containing a cycloolefin-based polymer, and a resin having a melt flow rate of 1 g/10 minutes or more and a tensile elastic modulus E of 50 MPa or more and 1200 MPa or less.
  • the melt flow rate here is a value measured at 190° C. and a load of 2.16 kg.
  • the “melt flow rate measured at 190° C. and a load of 2.16 kg” is also simply referred to as “MFR”.
  • the cycloolefin-based resin is a resin containing a cycloolefin-based polymer.
  • the cycloolefin-based polymer contained in the cycloolefin-based resin includes a polymer block [A] containing a repeating unit [I] derived from an aromatic vinyl compound as a main component and a repeating unit [I] derived from an aromatic vinyl compound.
  • a block copolymer hydride obtained by hydrogenating the block copolymer [D] consisting of Examples of such block copolymer hydrides include WO2000/32646, WO2001/081957, JP2002-105151A, JP2006-195242A, JP2011-13378A, and WO2015/002020. Nos., and the like.
  • the cycloolefin-based resin preferably has an MFR of 1 g/10 minutes or more and a tensile elastic modulus E of 50 MPa or more and 1200 MPa or less, but the MFR, the tensile elastic modulus E, or both are out of the above range. May be.
  • the “polymer block [A] containing a repeating unit [I] derived from an aromatic vinyl compound as a main component” is a polymer block containing more than 60% by mass of a repeating unit derived from an aromatic vinyl compound. It may be a united block [A]”.
  • “Polymer block [B] containing a repeating unit [I] derived from an aromatic vinyl compound and a repeating unit [II] derived from a chain conjugated diene compound as a main component” is a repeating unit [I] derived from an aromatic vinyl compound.
  • a polymer block [B]” in which the total of repeating units [II] derived from a chain conjugated diene compound is more than 60% by mass.
  • a polymer block [C] having a repeating unit [II] derived from a chain conjugated diene compound as a main component] is a polymer block [C] containing a repeating unit derived from a chain conjugated diene compound in an amount of more than 60% by mass. Can be said.
  • the resin constituting the resin layer is preferably a resin having a melt flow rate of 1 g/10 minutes or more and a tensile elastic modulus E of 50 MPa or more and 1200 MPa or less.
  • the resin having an MFR of 1 g/10 minutes or more and a tensile elastic modulus E of 50 MPa or more and 1200 MPa or less is preferably a cycloolefin resin, but may be a resin other than the cycloolefin resin. ..
  • the MFR of the resin is preferably 1 g/10 minutes or more, more preferably 3 g/10 minutes or more, further preferably 5 g/10 minutes or more, preferably 300 g/10 minutes or less, more preferably 100 g/10 minutes or less. is there.
  • the retardation can be suppressed to be small when it is used as a polarizing plate, and by setting the MFR to the upper limit value or less, heat resistance can be improved.
  • the MFR of resin can be measured based on JIS-K-7210 using a melt indexer at a temperature of 190° C. and a load of 2.16 kg.
  • the tensile elastic modulus E of the resin constituting the resin layer is preferably 50 MPa or more, more preferably 100 MPa or more, further preferably 200 MPa or more, preferably 1200 MPa or less, more preferably 1000 MPa or less, further preferably It is 800 MPa or less.
  • the retardation of the resin layer is reduced when the laminate is stretched to form a polarizing plate, and the laminate is stretched to the upper limit or less. At this time, it is possible to prevent breakage of the resin layer.
  • the tensile modulus can be measured using a tensile tester (manufactured by Instron Japan Company Limited, product name "Electric Mechanical Universal Material Tester (5564)") based on JIS K7127.
  • the resin forming the resin layer preferably contains a plasticizer, a softening agent, or both of them.
  • a plasticizer By containing the plasticizer, the softening agent, or both of them, the retardation generated in the resin layer when the laminate is stretched to obtain a polarizing plate can be reduced.
  • plasticizers and softeners those which can be uniformly dissolved or dispersed in the resin constituting the resin layer can be used.
  • plasticizers and softeners include ester-based plasticizers composed of polyhydric alcohols and monovalent carboxylic acids (hereinafter referred to as “polyhydric alcohol ester-based plasticizers”), and polyvalent carboxylic acids and monovalent carboxylic acids.
  • Ester plasticizers hereinafter referred to as "polyvalent carboxylic acid ester plasticizers" consisting of the above alcohols, and phosphoric acid ester plasticizers, carbohydrate ester plasticizers, and other polymer softeners Are listed.
  • the polyhydric alcohol which is a raw material of the ester plasticizer preferably used in the present invention, is not particularly limited, but ethylene glycol, glycerin, and trimethylolpropane are preferable.
  • polyhydric alcohol ester plasticizers examples include ethylene glycol ester plasticizers, glycerin ester plasticizers, and other polyhydric alcohol ester plasticizers.
  • polyvalent carboxylic acid ester plasticizers examples include dicarboxylic acid ester plasticizers and other polycarboxylic acid ester plasticizers.
  • phosphoric acid ester-based plasticizers include phosphoric acid alkyl esters such as triacetyl phosphate and tributyl phosphate; phosphoric acid cycloalkyl esters such as tricyclopentyl phosphate and cyclohexyl phosphate; triphenyl phosphate and tricresyl phosphate. And phosphoric acid aryl esters.
  • carbohydrate ester-based plasticizer examples include glucose pentaacetate, glucose pentapropionate, glucose pentabutyrate, sucrose octaacetate, and sucrose octabenzoate. Among them, sucrose octaacetate is more preferable. preferable.
  • polymer softening agent examples include aliphatic hydrocarbon polymers, alicyclic hydrocarbon polymers, ethyl polyacrylate, polymethyl methacrylate, methyl methacrylate and 2-hydroxyethyl methacrylate.
  • Acrylic polymers such as copolymers, copolymers of methyl methacrylate, methyl acrylate and 2-hydroxyethyl methacrylate; vinyl polymers such as polyvinyl isobutyl ether and poly N-vinylpyrrolidone; polystyrene, poly 4 -Styrene-based polymers such as hydroxystyrene; polyesters such as polybutylene succinate, polyethylene terephthalate and polyethylene naphthalate; polyethers such as polyethylene oxide and polypropylene oxide; polyamides, polyurethanes and polyureas.
  • the aliphatic hydrocarbon polymer examples include low molecular weight compounds such as polyisobutylene, polybutene, poly-4-methylpentene, poly-1-octene, ethylene/ ⁇ -olefin copolymer and hydrides thereof; polyisoprene , Low molecular weight compounds such as polyisoprene-butadiene copolymer, and hydrides thereof.
  • the aliphatic hydrocarbon polymer preferably has a number average molecular weight of 300 to 5,000 from the viewpoint of being easily uniformly dissolved or dispersed in the cycloolefin resin.
  • the polymer softener may be a homopolymer composed of one type of repeating unit or a copolymer having a plurality of repeating structures. Further, two or more kinds of the above polymers may be used in combination.
  • plasticizer a softening agent, or both of them (hereinafter, also referred to as “plasticizer etc.”), an ester plasticizer and an aliphatic carbonizer are particularly preferable because of their excellent compatibility with the resin constituting the resin layer. It is preferably one or more selected from hydrogen polymers.
  • the proportion of the plasticizer and the like in the resin layer is preferably 0.2 parts by weight or more, more preferably 0.5 parts by weight or more, and even more preferably 1.0 part by weight with respect to 100 parts by weight of the resin constituting the resin layer. It is at least 50 parts by weight, preferably at most 50 parts by weight, more preferably at most 40 parts by weight.
  • the resin layer preferably contains an organometallic compound.
  • the inclusion of the organometallic compound makes it possible to more effectively suppress the occurrence of peeling of the resin layer when the laminate is stretched at a high stretch ratio (for example, wet stretch at a stretch ratio of 6.0).
  • Organometallic compounds are compounds containing at least one of a chemical bond between metal and carbon and a chemical bond between metal and oxygen, and are metal compounds having an organic group.
  • organometallic compound examples include organosilicon compounds, organotitanium compounds, organoaluminum compounds, organozirconium compounds and the like. Of these, organosilicon compounds, organotitanium compounds and organozirconium compounds are preferred, and organosilicon compounds are more preferred, because they have excellent reactivity with polyvinyl alcohol.
  • the organometallic compounds may be used alone or in combination of two or more.
  • organometallic compound examples include, but are not limited to, organosilicon compounds represented by the following formula (1).
  • R 1 a Si(OR 2 ) 4-a (1)
  • R 1 and R 2 are each independently a hydrogen atom, a halogen atom, a hydrocarbon group having 1 to 10 carbon atoms, an epoxy group, an amino group, a thiol group, an isocyanate group, and a carbon atom.
  • a group represents a group selected from the group consisting of organic groups having 1 to 10 atoms, and a represents an integer of 0 to 4.
  • R 1 examples include epoxy group, amino group, thiol group, isocyanate group, vinyl group, acryl group, aryl group, —CH 2 OC n H 2n+1 (n is 1 to 4). Represents an integer.) An alkyl group having 1 to 8 carbon atoms and the like can be mentioned. Further, in the formula (1), preferred examples of R 2 include a hydrogen atom, a vinyl group, an aryl group, an acryl group, an alkyl group having 1 to 8 carbon atoms, and —CH 2 OC n H 2n+1 (n is 1 Represents an integer of 4 to 4) and the like.
  • organosilicon compound examples include epoxy-based organosilicon compounds such as 3-glycidoxypropyltrimethoxysilane and 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-aminopropyltrimethoxysilane, N- Amino-based organosilicon compounds such as 2-(aminoethyl)-3-aminopropyltrimethoxysilane, isocyanurate-based organosilicon compounds such as tris-(trimethoxysilylpropyl)isocyanurate, and 3-mercaptopropyltrimethoxysilane Examples thereof include mercapto-based organosilicon compounds and isocyanate-based organosilicon compounds such as 3-isocyanatepropyltriethoxysilane.
  • organic titanium compounds examples include titanium alkoxides such as tetraisopropyl titanate, titanium chelates such as titanium acetylacetonate, and titanium acylates such as titanium isostearate.
  • organic zirconium compounds include zirconium alkoxides such as normal propyl zirconate, zirconium chelates such as zirconium tetraacetylacetonate, and zirconium acylates such as zirconium stearate.
  • organic aluminum compounds examples include aluminum alkoxides such as aluminum secondary butoxide, and aluminum chelates such as aluminum trisacetylacetonate.
  • the proportion of the organometallic compound in the resin layer is preferably 0.005 parts by weight or more, more preferably 0.01 parts by weight or more, and even more preferably 0.03 parts by weight with respect to 100 parts by weight of the resin forming the resin layer.
  • the amount is at least 1.0 part by weight, and preferably at most 1.0 part by weight, more preferably at most 0.5 part by weight.
  • the resin layer may contain an optional component in addition to the resin, the plasticizer, the organometallic compound, and the like.
  • optional components include stabilizers such as antioxidants, ultraviolet absorbers and light stabilizers; resin modifiers such as lubricants; coloring agents such as dyes and pigments; and antistatic agents. These compounding agents can be used alone or in combination of two or more, and the compounding amount thereof is appropriately selected.
  • the thickness of the resin layer in the laminate is preferably 3 ⁇ m or more, more preferably 5 ⁇ m or more, preferably 60 ⁇ m or less, and more preferably 20 ⁇ m or less.
  • the thickness of the resin layer is equal to or more than the lower limit value of the above range, it is possible to effectively prevent melting of the polarizer in the polarization step, and when the thickness is equal to or less than the upper limit value of the above range, the laminate is stretched. The retardation generated in the resin layer when the polarizing plate is obtained can be reduced.
  • Re2 of resin layer is preferably 0 nm or more and 20 nm or less. Re2 is more preferably 0 nm or more, more preferably 10 nm or less, and particularly preferably 5 nm or less. When Re2 is equal to or less than the upper limit value, the retardation developed in the resin layer when the laminate 10 is stretched to form a polarizing plate can be reduced. Re2 is a stretched laminated body in which the laminated body 10 is uniaxially stretched 6.0 times at a free end under a temperature condition of 50° C. to 120° C.
  • a resin layer in the laminated body is a stretched resin layer, that is, a stretched product of the resin layer Is the retardation in the in-plane direction of the stretched resin layer. That is, Re2 is not the retardation of the resin layer itself in the laminate, but the retardation generated in the stretched product of the resin layer after the laminate is subjected to the specific stretching treatment.
  • the stretching temperature for obtaining such a stretched product may be any temperature within the range of 50°C to 120°C. Therefore, a plurality of operating conditions for stretching to obtain a stretched product are conceivable.
  • the stretched product When the stretched product exhibits a retardation of 0 nm or more and 20 nm or less by any one of the plurality of operating conditions, the laminate satisfies the above requirements. However, it is preferable that the stretched product exhibits a retardation of 0 nm or more and 20 nm or less under all of the plurality of possible operating conditions. In that case, in the production of a polarizing plate using the polarizing plate laminate of the present invention, a high degree of freedom in setting stretching conditions can be obtained. In general, in the temperature range, a larger retardation appears when the stretching temperature is lower. Therefore, if both the retardation of the stretched product by stretching at 50° C. and the retardation of the stretched product by stretching at 120° C. are in the range of 0 nm or more and 20 nm or less, the stretched product has 0 nm by all of the plurality of operating conditions. It can be determined that a phase difference of not less than 20 nm is exhibited.
  • the method for producing a laminate may include a fourth step of activating the surface of the polarizer material film before the second step.
  • FIG. 2 is a schematic view schematically showing an example of a manufacturing apparatus 200 used in the method for manufacturing a laminated body according to this embodiment.
  • the manufacturing apparatus 200 includes a feeding device 201, a coating device 202, a winding device 203, a stretching device 204, a processing device 205 that performs an activation process, and a drying device 206.
  • A1 is the transport direction.
  • the raw material film 1 fed from the feeding device 201 is conveyed to the stretching device 204, and is stretched by the stretching device 204 to obtain the polarizer material film 11 (first step). ).
  • the polarizer material film 11 is conveyed to the processing device 205, and after the activation processing (fourth step) is performed in the processing device 205, a coating layer is formed in the coating device 202 (second step),
  • the laminate 10 is obtained through the step of drying in the drying device 206 (third step).
  • the manufactured laminated body 10 is wound by the winding device 203 into a roll shape, and can be subjected to a further step. Each step will be described below.
  • the first step is a step of stretching a raw film containing a polarizer material to obtain a polarizer material film.
  • the stretching process of the original film in the first step is [1. It is preferable to carry out under the conditions and methods (method of stretching treatment, aspect of stretching, stretching ratio, stretching temperature) described in the section of [Polarizer material film] of [Laminate]. Specifically, in the first step, it is preferable that the stretching ratio for stretching the raw film is X, and X satisfies 1.5 ⁇ X ⁇ 5.5. A more preferable range of X is [1. It is as described in the section of [Polarizer material film] of [Laminate].
  • the second step is a step of applying a resin to one surface of the polarizer material film 11 to form a coating layer.
  • the method for applying the resin to the polarizer material film 11 is not particularly limited, but for example, it is preferably one or more methods selected from solution coating, emulsion coating, and melt extrusion coating. Solution coating is more preferable because a resin layer having a uniform and uniform thickness can be obtained.
  • the coating layer is formed by solution coating
  • the resin used for forming the coating layer and components added as necessary are dissolved in a solvent to form a resin composition, and the resin composition is applied to the polarizer material film 11. That is, the phrase “applying a resin” includes both the case of applying a resin only and the case of applying a resin composition containing a resin and other components.
  • the third step is a step of drying the coating layer formed in the second step.
  • the resin layer 12 is formed on one surface of the polarizer material film 11.
  • the coating layer is preferably dried in a dryer at a temperature of 50° C. to 120° C. for 0.5 minutes to 10 minutes.
  • the drying temperature of the coating layer is more preferably 60°C or higher, further preferably 70°C or higher, more preferably 100°C or lower, and further preferably 90°C or lower.
  • the fourth step is a step of activating the surface of the polarizer material film before the second step.
  • the fourth step is an optional step, and the production method of the present invention may or may not include the fourth step.
  • the fourth step by activating the surface of the polarizer material film, the plasticizer and the like bleeding on the surface of the polarizer material film are removed, and the adhesiveness of the resin layer is oxidized by oxidizing the surface of the polarizer material film. It is possible to prevent the resin layer from peeling off when the resin layer is provided.
  • Examples of the activation method include corona treatment, plasma treatment, saponification treatment, primer treatment, anchor coating treatment and the like.
  • the timing of performing the fourth step is not limited as long as it is before the second step, and when performing the heat treatment step described later, before the heat treatment step, after the heat treatment step, and at the same time as the heat treatment step. You may go at any time. It is particularly preferable to perform the fourth step after the heat treatment step because the plasticizer contained in the polarizer material film may bleed to the surface of the polarizer material film due to the heat treatment step.
  • the heat treatment step is a step of heat-treating the polarizer material film before the second step.
  • the heat treatment step is an optional step, and the production method of the present invention may or may not include the heat treatment step.
  • the heating temperature of the polarizer material film is preferably 50° C. or higher, more preferably 60° C. or higher, preferably 100° C. or lower, more preferably 90° C. or lower.
  • the laminate 10 of the present invention is a material for manufacturing a polarizing plate.
  • the laminate can be made into a polarizing plate after being subjected to treatments such as stretching treatment and dyeing treatment.
  • the laminated body 10 When the laminated body 10 is used as the material of the polarizing plate, the laminated body wound by the winding device 203 shown in FIG. 2 may be used as it is, or the resin layer 12 of the laminated body wound by the winding device 203.
  • You may laminate
  • the polarizing plate of the present embodiment using the laminated body 10 of the present embodiment will be described.
  • FIG. 3 is a schematic view schematically showing an example of a manufacturing apparatus for manufacturing a polarizing plate using the laminate according to this embodiment.
  • FIG. 4 is a cross-sectional view schematically showing a polarizing plate manufactured using the laminated body according to this embodiment.
  • the polarizing plate 100 of this embodiment is a polarizing plate obtained by uniaxially stretching the laminate of this embodiment. As shown in FIG. 4, in the polarizing plate 100, the resin layer 112 is laminated on one surface (upper side surface in the drawing) of the polarizer material film 111.
  • the thickness of the polarizer material film 111 in the polarizing plate 100 is preferably 30 ⁇ m or less, more preferably 20 ⁇ m or less, preferably 3 ⁇ m or more, and more preferably 5 ⁇ m or more.
  • the thickness is not more than the upper limit, the thickness of the polarizing plate can be reduced, and when the thickness is not less than the lower limit, a polarizing plate having a sufficiently high degree of polarization can be obtained.
  • the retardation in the in-plane direction of the resin layer in the polarizing plate is preferably 20 nm or less, more preferably 15 nm or less, further preferably 10 nm or less, and more preferably 0 nm or more.
  • the retardation in the in-plane direction of the resin layer in the polarizing plate is within the above range, black color shift when the polarizing plate is mounted on the liquid crystal display device can be suppressed.
  • the method for producing a polarizing plate of the present invention is a method for producing a polarizing plate using the laminate of the present invention or the laminate obtained by the method of producing a laminate of the present invention.
  • the method for producing a polarizing plate of the present invention includes a fifth step of dyeing the laminate with a dichroic dye, and a sixth step of uniaxially stretching the laminate. That is, the method for producing a polarizing plate of the present invention includes a step of producing the laminate of the present invention by any method, or a step of producing a laminate by the method of producing the laminate of the present invention, and It includes a fifth step of dyeing with a color dye and a sixth step of uniaxially stretching the laminate.
  • the manufacturing method of the polarizing plate of the present invention after the fifth step, the sixth step or both of these, one of the surface of the laminate material side of the polarizer material film and the surface of the resin layer, or You may include the 7th process of sticking a protective film on both surfaces.
  • the seventh step is an optional step, and in this embodiment, an example of manufacturing a polarizing plate by a manufacturing method that does not include the seventh step will be described.
  • a manufacturing device 300 for manufacturing a polarizing plate includes feeding devices 301 and 307, processing devices 302 to 305, a drying device 306, a laminating device 308, and a winding device 310.
  • the laminate 10 delivered from the delivery device 301 is conveyed to the processing devices 302 to 305 to dye the laminate 10 with a dichroic dye (fifth step) and the laminate. Is stretched uniaxially (sixth step).
  • the polarizing plate 100 is obtained by performing a process (drying process) of drying the laminated body after the above processes by the drying device 306.
  • drying process drying the laminated body after the above processes by the drying device 306.
  • the fifth step is a step of dyeing the laminate 10 with a dichroic dye.
  • the polarizer material film of the laminate is dyed.
  • the polarizer material film included in the laminate for performing the fifth step is preferably undyed, but the dyeing of the polarizer material film is performed on the polarizer material film before forming the laminate. You can go.
  • the dichroic dye (dichroic substance) for dyeing the laminate in the fifth step iodine, organic dyes and the like can be mentioned.
  • the dyeing method using these dichroic dyes is arbitrary.
  • dyeing may be performed by immersing the layer of the polarizer material film in a dyeing solution containing a dichroic dye.
  • the dyeing solution may contain an iodide such as potassium iodide from the viewpoint of enhancing the dyeing efficiency.
  • the dichroic dye is not particularly limited, but when the polarizing plate is used in a vehicle-mounted display device, an organic dye is preferable as the dichroic dye.
  • the sixth step is a step of uniaxially stretching the laminate.
  • the method for stretching the laminate is not particularly limited, but wet stretching is preferable.
  • the sixth step may be performed at any time before the fifth step, after the fifth step, and at the same time as the fifth step.
  • the sixth step may be divided into a plurality of times before the fifth step, after the fifth step, and at any time simultaneously with the fifth step.
  • the stretching step may be performed once or twice or more.
  • the stretching ratio of the laminate is Z times, and Z can be 1.2 ⁇ Z ⁇ 5.0.
  • Z is preferably 1.2 or more, more preferably 1.5 or more, preferably 5.0 or less, more preferably 4.0 or less.
  • the stretching ratio of the laminate is equal to or lower than the upper limit value of the above range, the retardation of the resin layer is prevented from being expressed even after the polarizing plate manufacturing process including the stretching treatment, and the occurrence of breakage of the polarizing plate is prevented.
  • the stretching ratio is not less than the lower limit value of the above range, a polarizing plate having sufficient polarization performance can be obtained.
  • the total stretching ratio which is represented by the product of the stretching ratios of each time, falls within the above range.
  • the stretch ratio X of the original film in the first step and the stretch ratio Z of the laminate in the sixth step preferably satisfy 5.1 ⁇ X*Y ⁇ 9.0.
  • X*Y is the product of X and Y (product of stretching ratio).
  • X*Y is preferably 5.1 or more, more preferably 5.5 or more, preferably 9.0 or less, more preferably 7.0 or less.
  • X*Y is equal to or less than the upper limit value of the above range, the retardation of the resin layer is prevented from being expressed and the breakage of the polarizing plate is prevented even after the manufacturing process of the polarizing plate including the stretching treatment. You can When X*Y is at least the lower limit value of the above range, a polarizing plate having sufficient polarization performance can be obtained.
  • the stretching temperature of the laminate is not particularly limited, but is preferably 30° C. or higher, more preferably 40° C. or higher, particularly preferably 50° C. or higher, preferably 140° C. or lower, more preferably 90° C. or lower, especially It is preferably 70°C or lower.
  • the stretching temperature is preferably in the range of either dry stretching or wet stretching, but is particularly preferable in the case of wet stretching.
  • the stretching treatment of the laminate is either a longitudinal stretching treatment for stretching in the film longitudinal direction, a lateral stretching treatment for stretching in the film width direction, or an oblique stretching treatment for stretching in an oblique direction that is neither parallel nor perpendicular to the film width direction. You may go.
  • the stretching treatment of the laminate is preferably free-end uniaxial stretching, and more preferably longitudinal free-end uniaxial stretching.
  • the drying step is a step of drying the laminated body that has undergone the fifth step and the sixth step.
  • the drying step is an optional step.
  • the laminate is preferably dried in a dryer at a temperature of 50°C to 100°C for 0.5 minutes to 10 minutes.
  • the drying temperature of the laminate is more preferably 60°C or higher, and more preferably 90°C or lower.
  • the drying time of the laminate is more preferably 1 minute or more, and more preferably 5 minutes or less.
  • the polarizing plate of the present embodiment was directly laminated on the polarizer material film and the polarizer material film. Since it is manufactured using a laminate having a resin layer, it is possible to suppress cracking of the polarizer even after the drying step.
  • a polarizing plate laminate that can also be used as a protective film and can be efficiently produced even if it is thin, a method for producing the same, a polarizing plate using the laminate, a method for producing the same, and the polarizing plate A method for manufacturing the used display device can be provided.
  • the resin layer 12 is directly provided on the polarizer material film 11 without an adhesive or the like, so that the generation of wrinkles and voids due to the infiltration of the adhesive or the like is prevented. can do.
  • the effect of suppressing fracture is excellent, and the prevention of environmental pollution due to other substances in the production environment and the product It is possible to prevent contamination (contamination of foreign matter) with the.
  • polarizing plate 120 Polarizing plate and manufacturing method thereof
  • the polarizing plate 120 according to the second embodiment and a method for manufacturing the same will be described with reference to FIGS. 3 and 5.
  • the polarizing plate 120 according to this embodiment is manufactured by using the polarizing plate 100 according to the first embodiment.
  • the same components and aspects as those in the first embodiment are designated by the same reference numerals, and the duplicated description will be omitted.
  • FIG. 5 is a sectional view schematically showing the polarizing plate 120 according to the second embodiment of the present invention.
  • a resin layer 112 is laminated on one surface (upper side surface in the drawing) of a polarizer material film 111, and the other surface side (illustrated in the drawing) of the polarizer material film 111.
  • the protective film 115 is laminated on the lower surface.
  • the manufacturing method of the polarizing plate 120 of the present embodiment includes a seventh step of laminating a protective film on the surface of the laminate, which faces the polarizer material film, after the fifth step and the sixth step. This will be described in detail below.
  • the polarizing plate 120 of the present embodiment after the dyeing treatment (fifth step) for dyeing the polarizer material film 11 of the laminate 10 and the stretching treatment (sixth step) for uniaxially stretching the laminate.
  • a polarizing plate 100 obtained by drying with a drying device 306 is used.
  • the polarizing plate 120 conveys the polarizing plate 100 obtained through the dyeing treatment (fifth step) and the stretching treatment (sixth step) to the laminating apparatus 308 to form a laminate. It is obtained by bonding the protective film 115 fed from the feeding device 307 to the surface of the polarizer material film side (seventh step).
  • the obtained polarizing plate 120 is wound by the winding device 310 to be in the shape of a roll, which can be subjected to a further step.
  • the protective film 115 used in the seventh step may be a film made of one or more resins selected from cycloolefin resin, acrylic resin, polyethylene terephthalate resin, and triacetyl cellulose resin.
  • Adhesion of the protective film 115 to the polarizing plate 100 is not particularly limited and may be performed by a method such as thermocompression bonding (see FIG. 5).
  • the protective film 115 may be attached to the polarizing plate 100 via an adhesive or a pressure sensitive adhesive.
  • adhesives and pressure-sensitive adhesives used for bonding the protective film and the polarizing plate include acrylic adhesives, epoxy adhesives, urethane adhesives, polyester adhesives, polyvinyl alcohol adhesives, and polyolefin adhesives.
  • modified polyolefin adhesive polyvinyl alkyl ether adhesive, rubber adhesive, vinyl chloride-vinyl acetate adhesive, SEBS (styrene-ethylene-butylene-styrene copolymer) adhesive, ethylene-styrene
  • ethylene-based adhesives such as polymers, acrylate-based adhesives such as ethylene-(meth)acrylate acrylate copolymers and ethylene-(meth)acrylate acrylate copolymers.
  • the polarizing plate 120 of the present embodiment also polarizes a polarized material by stretching a laminate having a polarizer material film and a resin layer directly laminated on the surface of the polarizer material film. Since the plate is manufactured, the same effects as those of the first embodiment are obtained.
  • the protective film 115 is provided on the surface of the polarizer material film 111 on the side where the resin layer 112 is not laminated, the surface of the polarizer material film 111 is prevented from being scratched or the like. Also effective.
  • the polarizing plate manufactured using the laminate of the present invention can be a material for display devices such as liquid crystal display devices, organic EL display devices, inorganic EL display devices, and micro LED display devices.
  • the method for producing a display device of the present invention is a method for producing a display device using the polarizing plate obtained by the method for producing a polarizing plate of the present invention, and includes an eighth step of laminating the polarizing plate on a panel. ..
  • the panel is a panel selected from a liquid crystal panel, an organic EL panel and a micro LED panel.
  • the method for manufacturing the display device of the present embodiment includes a step of stacking the polarizing plate 100 shown in FIG. 4 on a panel (eighth step).
  • a step of stacking the polarizing plate 100 shown in FIG. 4 on a panel (eighth step).
  • an example of manufacturing a liquid crystal display device using a liquid crystal panel as a panel will be described.
  • a liquid crystal display device includes a light source, a light source side polarizing plate, a liquid crystal cell and a viewing side polarizing plate in this order.
  • the polarizing plate obtained by the present invention can be used as a light source side polarizing plate, a viewing side polarizing plate or both.
  • the liquid crystal display device is manufactured by stacking the polarizing plate 100 on the liquid crystal panel as the light source side polarizing plate and the viewing side polarizing plate, respectively.
  • FIG. 6 is a cross-sectional view schematically showing a display device manufactured by the display device manufacturing method according to the third embodiment of the present invention.
  • the display device 400 includes two substrates 410 and 420, a liquid crystal layer 430 located between them, and polarizing plates 100 and 100 arranged outside the two substrates 410 and 420, respectively.
  • the two polarizing plates 100 are the polarizing plates 100 manufactured using the laminated body 10 of the first embodiment.
  • the two polarizing plates 100 are laminated such that the resin layer 112 of the polarizing plate is disposed between the polarizer material film 111 of the polarizing plate and the liquid crystal layer 430. ..
  • the resin layer can be used also as a protective film, can be efficiently manufactured even if the thickness is thin, and a display device provided with a polarizing plate that prevents the generation of wrinkles and voids. Can be provided.
  • the method for manufacturing the display device of the present embodiment includes a step of stacking the polarizing plate 120 shown in FIG. 5 on a panel (eighth step).
  • a step of stacking the polarizing plate 120 shown in FIG. 5 on a panel (eighth step).
  • an example of manufacturing an organic EL display device using an organic EL panel as a panel will be described.
  • an organic EL display device includes a substrate, a transparent electrode, a light emitting layer, and a metal electrode layer in order from the light emitting side, but the polarizing plate obtained by the manufacturing method of the present invention is arranged on the light emitting side of the substrate. It Usually, an organic EL display device has two substrates, a light emitting layer located between them, and a polarizing plate arranged outside one of the two substrates. The organic EL display device can be manufactured by providing the polarizing plate of the present invention on the organic EL panel.
  • the polarizing plate 120 is laminated on the organic EL panel to manufacture the organic EL display device.
  • FIG. 7 is a sectional view schematically showing a display device manufactured by the method for manufacturing a display device according to the fourth embodiment of the present invention.
  • the display device 500 includes two substrates 510 and 520, a light emitting layer 530 located between them, and a polarizing plate 120 arranged outside the lower substrate 510 (lower side in the drawing).
  • the polarizing plate 120 is the polarizing plate 120 of Embodiment 2 manufactured using the laminated body 10.
  • the polarizing plate 120 is laminated so that the resin layer 112 of the polarizing plate is disposed between the polarizer material film 111 of the polarizing plate and the light emitting layer 530.
  • the resin layer can be used also as a protective film, can be efficiently manufactured even if the thickness is thin, and a display device provided with a polarizing plate that prevents the generation of wrinkles and voids. Can be provided.
  • Embodiments 3 and 4 an example in which the panel is a liquid crystal panel and an organic EL panel is shown, but the panel on which the polarizing plates are laminated may be a micro LED panel.
  • the manufacturing method of the liquid crystal display device in which the two polarizing plates 100 described in the first embodiment are laminated is shown, but the present invention is not limited to this.
  • Two polarizing plates 120 described in Embodiment 2 may be laminated, two kinds of polarizing plates may be laminated, or one polarizing plate may be laminated.
  • the manufacturing method of the organic EL display device in which the polarizing plate 120 of the second embodiment is laminated is shown, but the polarizing plate 100 may be used instead of the polarizing plate 120.
  • the hydrogenation rate of the hydride of the block copolymer was calculated by 1 H-NMR spectrum or GPC analysis.
  • the region with a hydrogenation rate of 99% or less was calculated by measuring the 1 H-NMR spectrum, and the region with a hydrogenation rate of more than 99% was calculated from the ratio of the peak areas by the UV detector and the RI detector by GPC analysis.
  • MFR was measured based on JIS K7210 using an extrusion type plastometer (manufactured by Tateyama Kagaku Kogyo Co., Ltd., trade name "Melt Indexer (L240)" at a temperature of 190°C and a load of 2.16 kg. ..
  • the tensile modulus was measured using a sample film prepared by the same method as the "sample film” described in the "MFR measurement” section.
  • the tensile modulus was measured by the following method using a tensile tester (manufactured by Instron Japan Company Limited, trade name “electromechanical universal material tester (5564)") based on JIS K7127.
  • the sample film was punched out into the shape of the test piece type 1B described in JIS K7127, and the stress when the test piece was stretched and distorted was measured.
  • the stress measurement conditions were a temperature of 23° C., a humidity of 60 ⁇ 5% RH, a chuck distance of 115 mm, and a pulling speed of 50 mm/min.
  • the stress was measured 5 times. From the measured stress and the measured strain data corresponding to that stress, four points of measured data (that is, strain 0.6%, 0.8%, 1.0%, and 1.2% of the measured data) is selected, and the least squares method is selected from the measured data of 4 points (total 20 points) of 5 times of measurement. Was used to calculate the tensile modulus.
  • the retardation Re1 and retardation Re2 in the in-plane direction of the polarizer material film and the retardation in the in-plane direction of the resin layer in the polarizing plate are measured by a retarder (Muller matrix polarimeter manufactured by Optoscience Co., Ltd., trade name “ Axo Scan”). At the time of measurement, the measurement wavelength was 550 nm.
  • the retardation Re2 is measured by measuring the stretched resin layer, that is, the in-plane retardation generated in the resin layer obtained by uniaxially stretching the laminate at a predetermined temperature (50° C. and 120° C.) by 6.0 times. Was measured.
  • the thickness of each film (polarizer material film and resin layer) contained in the laminate and the thickness of each film contained in the polarizing plate are measured by a thickness gauge (manufactured by Mitutoyo Co., Ltd., trade name “ABS Digimatic Thickness Gauge (547- 401)”) was used 5 times and the average value was used as the thickness of each film.
  • a thickness gauge manufactured by Mitutoyo Co., Ltd., trade name “ABS Digimatic Thickness Gauge (547- 401)
  • the liquid crystal display panel was removed from the liquid crystal display device (trade name “IPS panel monitor (23MP47)” manufactured by LG Electronics Japan), and the polarizing plate arranged on the viewing side was peeled off to prepare in Examples and Comparative Examples.
  • the above polarizing plate was attached so that the resin layer was on the panel side.
  • a polarizer alone without a protective film was attached next to the polarizing plate prepared in Examples and Comparative Examples, and the liquid crystal display device was reassembled.
  • the polarizing plates prepared in Examples and Comparative Examples and the polarizer alone without the protective film were laminated so that the absorption axes thereof were in the same direction as the absorption axes of the polarizing plates before peeling.
  • the panel When the absorption axis direction of the polarizing plate arranged on the viewing side is 0° in azimuth and the vertical direction of the panel is 0° in polar direction, the panel is in a black display state (that is, a black color is displayed on the entire display screen of the panel). In a state of azimuth angle of 45°, polar angle of 45° and visually observed from the azimuth angle of 45°. The one with a large change was judged to be C.
  • Example 1 (1-1) Production of Polarizer Material Film
  • the thickness T1 of the polarizer material film was 16 ⁇ m, and Re1 was 320 nm.
  • the hydrogenated block copolymer [E1] had an Mw of 84,500, an Mw/Mn of 1.20, and the hydrogenation rates of the main chain and the aromatic ring were almost 100%.
  • Pentaerythrityl tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate] (Matsubara Sangyo Co., Ltd., product 0.1 part (name "Songnox 1010”) was melt-kneaded and blended, and then pelletized to obtain a polymer X for molding.
  • the obtained coating liquid A for film formation was applied to one surface of the polarizer material film produced in (1-1) using a die coater and dried. As a result, a long laminate including the polarizer material film and the resin layer containing the polymer X (width 600 mm, thickness 10 ⁇ m) was obtained. In the obtained laminate, the thickness of the resin layer, the thickness T1 of the polarizer material film, the retardation Re1 in the in-plane direction, and the retardation Re2 (temperature conditions of 50° C. and 120° C.) were measured. Further, the MFR and the tensile elastic modulus of the resin forming the resin layer were measured by the method described in the evaluation method. The results are shown in Table 1.
  • (1-4) Production of Polarizing Plate The following operation was performed while continuously transporting the laminated body produced in (1-3) in the longitudinal direction via a guide roll.
  • the above-mentioned laminate was subjected to a swelling treatment in which it was immersed in water, a dyeing treatment in which it was immersed in a dyeing solution containing iodine and potassium iodide, and a first stretching treatment in which the laminate after the dyeing treatment was stretched.
  • the laminate after the first stretching treatment was subjected to a second stretching treatment of stretching in a bath containing boric acid and potassium iodide.
  • the stretching temperature was 57°C.
  • the laminate after the second stretching treatment was dried in a dryer at 70°C for 5 minutes (drying step) to obtain a polarizing plate.
  • the adhesiveness was evaluated in the steps up to the second stretching treatment, the drying processability was evaluated in the drying process, and the resulting polarizing plate was evaluated for surface condition and black color shift.
  • the evaluation results are shown in Table 1. Further, the thickness and retardation of the resin layer and the thickness of the polarizer material film in the obtained polarizing plate were measured, and the measurement results are shown in Table 1.
  • the coating liquid B for film formation was prepared by the following method.
  • the polymer X produced in (1-2) of Example 1 was dissolved in cyclohexane, and then 0.1 part by weight of an organosilicon compound (3-aminopropyltriethoxysilane, KBM903) was added to 100 parts by weight of the polymer X. , Shin-Etsu Chemical Co., Ltd.) was added to prepare a film-forming coating solution B (resin composition B).
  • the coating liquid C for film formation was prepared by the following method. After dissolving the polymer X produced in (1-2) of Example 1 in cyclohexane, 40 parts by weight of polyisobutene (“Nisseki Polybutene HV-manufactured by JX Nikko Nisseki Energy Co., Ltd.” per 100 parts by weight of the polymer X is dissolved. 300", a number average molecular weight of 1,400), and 0.1 part by weight of an organic titanium compound (tetraisopropyl titanate, Organix TA-8, manufactured by Matsumoto Fine Chemical Co., Ltd.), and a coating liquid C (resin composition) for film formation. The product C) was produced.
  • the coating liquid D for film formation was prepared by the following method. After dissolving the polymer X produced in (1-2) of Example 1 in cyclohexane, 40 parts by weight of polyisobutene (“Nisseki Polybutene HV-manufactured by JX Nikko Nisseki Energy Co., Ltd.” per 100 parts by weight of the polymer X is dissolved. 300", number average molecular weight 1,400), and 0.1 part by weight of an organic zirconium compound (normal propyl zirconate, Organix ZA-45, manufactured by Matsumoto Fine Chemical Co., Ltd.), and a film-forming coating liquid D (resin). Composition D) was made.
  • Example 8 an unstretched polyvinyl alcohol film having a thickness of 45 ⁇ m (average polymerization degree of about 2400, saponification degree of 99.9 mol %, hereinafter also referred to as “PVA45”) was used as the original film.
  • a laminate and a polarizing plate were produced and evaluated in the same manner as in Example 1. The results are shown in Table 2.
  • Example 10 an unstretched polyvinyl alcohol film having a thickness of 60 ⁇ m (average polymerization degree of about 2400, saponification degree of 99.9 mol%, hereinafter also referred to as “PVA60”) was used as the original fabric film.
  • PVA60 average polymerization degree of about 2400, saponification degree of 99.9 mol%, hereinafter also referred to as “PVA60”.
  • a laminate and a polarizing plate were produced and evaluated in the same manner as in Example 1. The results are shown in Table 2.
  • a laminate and a polarizing plate were manufactured by performing the same operation as in Example 1 except that the value was set to 0.0, and evaluated in the same manner as in Example 1. The results are shown in Table 3.
  • the coating liquid E for film formation was prepared by the following method. After dissolving the polymer X produced in (1-2) of Example 1 in cyclohexane, 40 parts by weight of polyisobutene (“Nisseki Polybutene HV-manufactured by JX Nikko Nisseki Energy Co., Ltd.” per 100 parts by weight of the polymer X is dissolved. 300", number average molecular weight 1,400) was added to prepare coating solution E for film formation (resin composition E).
  • Example 1 [Comparative Example 1] (1-4) of Example 1 except that PVA20 (unstretched polyvinyl alcohol resin film) was used in place of the laminate produced in (1-3) in (1-4) of Example 1.
  • PVA20 unstretched polyvinyl alcohol resin film
  • This adhesive was applied to one surface of the above resin film, and the polarizer material film produced in (C2-1) was attached. In this state, the adhesive was heated and dried at 70° C. for 5 minutes to obtain a laminate. The obtained laminate was subjected to the same operations as in (1-4) of Example 1 to obtain a polarizing plate. The obtained laminate and polarizing plate were evaluated in the same manner as in Example 1. The results are shown in Table 3.
  • Re2 (50° C.) means the phase difference in the in-plane direction of the resin layer that occurs when the laminate is uniaxially stretched 6.0 times at the temperature condition of 50° C. at the free end.
  • Re2 (120° C.) means the retardation in the in-plane direction of the resin layer, which occurs when the laminate is uniaxially stretched 6.0 times at the temperature condition of 120° C. at the free end.
  • Re1 means the retardation in the in-plane direction of the polarizer material film in the laminate.
  • direct coating means that the resin layer is formed by directly coating the film forming coating liquid (resin composition) on the polarizer material film, and “bonding” is the resin film. Was bonded to the polarizer material film via an adhesive.
  • polarizer means a polarizer material film in a polarizing plate.
  • the retardation developed in the resin layer after the step of stretching the laminate can be reduced, and the adhesiveness, the drying processability and the optical physical properties are excellent. It can be seen that a polarizing plate can be obtained. Further, according to the present invention, it can be seen that the generation of wrinkles and voids can be prevented. Thereby, the resin layer can be used also as a protective film, can be efficiently produced even when the thickness is thin, and a laminate and a method for producing the same, in which wrinkles and voids are prevented, are used. It can be seen that a polarizing plate, a method for manufacturing the same, and a method for manufacturing a display device can be provided.

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  • Physics & Mathematics (AREA)
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  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
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  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Theoretical Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Polarising Elements (AREA)
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PCT/JP2020/001372 2019-01-23 2020-01-16 積層体、偏光板、積層体の製造方法、偏光板の製造方法及び表示装置の製造方法 WO2020153233A1 (ja)

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