WO2020137409A1 - Stratifié optiquement anisotrope, procédé de production de celui-ci, plaque de polarisation circulaire et dispositif d'affichage d'image - Google Patents

Stratifié optiquement anisotrope, procédé de production de celui-ci, plaque de polarisation circulaire et dispositif d'affichage d'image Download PDF

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WO2020137409A1
WO2020137409A1 PCT/JP2019/047519 JP2019047519W WO2020137409A1 WO 2020137409 A1 WO2020137409 A1 WO 2020137409A1 JP 2019047519 W JP2019047519 W JP 2019047519W WO 2020137409 A1 WO2020137409 A1 WO 2020137409A1
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optically anisotropic
anisotropic layer
layer
resin
laminate
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PCT/JP2019/047519
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English (en)
Japanese (ja)
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和弘 大里
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日本ゼオン株式会社
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Priority to KR1020217017868A priority Critical patent/KR20210107650A/ko
Priority to CN201980083873.4A priority patent/CN113196876A/zh
Priority to JP2020562994A priority patent/JP7452436B2/ja
Publication of WO2020137409A1 publication Critical patent/WO2020137409A1/fr

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • 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
    • 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
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • 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
    • 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

Definitions

  • the present invention relates to an optically anisotropic laminate, a method for manufacturing the same, a circularly polarizing plate, and an image display device.
  • Image display devices such as organic electroluminescence image display devices may reduce the quality of image display by reflecting external light.
  • organic electroluminescence may be referred to as “organic EL”.
  • organic EL organic electroluminescence
  • a circularly polarizing plate may be provided on the display surface of the image display device (for example, see Patent Document 1).
  • External light is converted into circularly polarized light in a certain direction by the circularly polarizing plate, and becomes circularly polarized light in the opposite direction when reflected by the image display device. Since the reflected light that has become circularly polarized light in the opposite direction does not pass through the circularly polarizing plate, reflection is suppressed.
  • the circularly polarizing plate includes a linear polarizer, a ⁇ /2 plate having a slow axis in a direction forming a predetermined angle with respect to the absorption axis of the linear polarizer, and an absorption axis of the linear polarizer. And a ⁇ /4 plate having a slow axis in a direction forming a predetermined angle with respect to the ⁇ /2 plate, the wavelength dispersion of the ⁇ /2 plate and the wavelength dispersion of the ⁇ /4 plate are different, and the NZ of the ⁇ /4 plate is It is described that reflection can be effectively suppressed by providing a configuration in which the coefficient is a predetermined value. However, even when such a circularly polarizing plate is provided on the display surface of the image display device, when the display surface is observed from the tilt direction, the light reflected by the display surface is visually recognized, and thus the display surface is colored. I could see it.
  • a circularly polarizing plate is a ⁇ /4 plate produced by laminating a linear polarizer and two stretched films in parallel with their slow axes in parallel, and by setting the NZ coefficient to a predetermined value, It is described that reflection can be suppressed.
  • the reflection suppressing effect is insufficient when the display surface is observed from the front direction and the tilt direction, and the display surface looks colored. There was something.
  • the optical anisotropy including a first optical anisotropic layer satisfying a predetermined optical condition and a second optical anisotropic layer satisfying a predetermined optical condition.
  • the sum of the NZ coefficient NZ1 of the first optically anisotropic layer and the NZ coefficient NZ2 of the second optically anisotropic layer is within a predetermined range, and the slow axis of the first optically anisotropic layer is
  • the present invention has been completed by finding that the above problems can be solved by adopting a mode in which the slow axis of the second optically anisotropic layer is orthogonal to the above. That is, the present invention provides the following.
  • An optically anisotropic laminate including a first optically anisotropic layer and a second optically anisotropic layer,
  • the first optically anisotropic layer satisfies the following formula (1)
  • the second optically anisotropic layer satisfies the following formula (2)
  • the optically anisotropic laminate satisfies the following formula (3)
  • the NZ coefficient NZ1 of the first optically anisotropic layer and the NZ coefficient NZ2 of the second optically anisotropic layer satisfy the following formula (4)
  • An optically anisotropic laminate, wherein an angle formed by the slow axis of the first optically anisotropic layer and the slow axis of the second optically anisotropic layer is 85° to 95°.
  • nx1 represents the in-plane direction of the first optically anisotropic layer and represents the refractive index in the direction that gives the maximum refractive index
  • ny1 represents the in-plane direction of the first optically anisotropic layer
  • nx1 represents the refractive index in the direction orthogonal to the direction
  • nz1 represents the refractive index in the thickness direction of the first optical anisotropic layer
  • nx2 represents an in-plane direction of the second optically anisotropic layer and represents a refractive index in a direction that gives the maximum refractive index
  • ny2 represents an in-plane direction of the second optically anisotropic layer
  • nx2 represents the refractive index in the direction orthogonal to
  • the first optically anisotropic layer is a stretched film of a first resin film, The optically anisotropic laminate according to any one of [1] to [3], wherein the first resin film contains a resin having a positive intrinsic birefringence value.
  • the second optically anisotropic layer is a stretched film of a second resin film, The optically anisotropic laminate according to any one of [1] to [5], wherein the second resin film contains a resin having a negative intrinsic birefringence value.
  • the second optically anisotropic layer is a stretched film obtained by stretching the second resin film in two directions, and the NZ2 is ⁇ 2.0 or more and ⁇ 0.2 or less. Optically anisotropic laminate.
  • a linear polarizer, A circularly polarizing plate comprising: the optically anisotropic laminate according to any one of [1] to [7].
  • the angle between the absorption axis of the linear polarizer or the transmission axis of the linear polarizer and the slow axis of the first optically anisotropic layer is 40° to 50°. Circular polarizing plate.
  • the linear polarizer, the first optically anisotropic layer, and the second optically anisotropic layer are provided in this order, or The circularly polarizing plate according to [8] or [9], which includes the linear polarizer, the second optically anisotropic layer, and the first optically anisotropic layer in this order.
  • An image display device comprising the circularly polarizing plate according to any one of [8] to [10] and an organic electroluminescence element, An image display device comprising: the linear polarizer, the optically anisotropic laminate, and the organic electroluminescent element in this order.
  • the image display apparatus which suppressed the coloring of the display surface seen from the inclination direction can be implement
  • FIG. 1 is an exploded perspective view schematically showing the circularly polarizing plate according to the first embodiment.
  • FIG. 2 is an exploded perspective view schematically showing the circularly polarizing plate according to the second embodiment.
  • FIG. 3 is a perspective view schematically showing a state of the evaluation model set when the chromaticity is calculated in the simulations of the example and the comparative example.
  • the “long” film means a film having a length of 5 times or more with respect to the width, preferably having a length of 10 times or more, and specifically, a roll.
  • a film having a length such that the film is wound into a shape and stored or transported.
  • the upper limit of the length of the long film is not particularly limited and may be, for example, 100,000 times or less the width.
  • nx represents the refractive index in the direction perpendicular to the thickness direction of the layer (in-plane direction) and giving the maximum refractive index (slow axis direction), and ny represents the in-plane direction of the layer.
  • nz represents the refractive index in the thickness direction of the layer, and d represents the thickness of the layer.
  • the measurement wavelength is 590 nm unless otherwise specified.
  • the slow axis of a layer indicates the in-plane slow axis of the layer unless otherwise specified.
  • the frontal direction of a surface means the normal direction of the surface unless specifically stated otherwise, and specifically refers to the direction with the polar angle of 0° and the azimuth angle of 0°.
  • the inclination direction of a surface means a direction that is neither parallel nor perpendicular to the surface unless specifically stated otherwise, and specifically, a range in which the polar angle of the surface is larger than 0° and smaller than 90°. Point in the direction of.
  • the terms “parallel”, “vertical”, and “orthogonal” of the directions of elements include an error within a range that does not impair the effects of the present invention, for example, a range of ⁇ 5°, unless otherwise specified. You can leave.
  • the longitudinal direction of the long film is usually parallel to the film flow direction in the production line.
  • polarizing plate “circular polarizing plate”, “plate”, and “ ⁇ /2 plate” and “ ⁇ /4 plate” are not limited to rigid members, for example, unless otherwise specified. It also includes a flexible member such as a resin film.
  • the angle formed by the optical axis (absorption axis, transmission axis, slow axis, etc.) of each layer in a member including a plurality of layers is the angle when the layer is viewed from the thickness direction unless otherwise specified. Represents.
  • polymer having a positive intrinsic birefringence value and “resin having a positive intrinsic birefringence value” means “the refractive index in the stretching direction is more than the refractive index in the direction orthogonal to the stretching direction. It means a “polymer which becomes larger” and “a resin whose refractive index in the stretching direction is larger than that in the direction orthogonal to the stretching direction", respectively.
  • a polymer having a negative intrinsic birefringence value and “a resin having a negative intrinsic birefringence value” mean that a polymer having a refractive index in the stretching direction smaller than that in the direction orthogonal to the stretching direction. It means “combined” and “resin whose refractive index in the stretching direction is smaller than that in the direction orthogonal to the stretching direction", respectively.
  • the intrinsic birefringence value can be calculated from the dielectric constant distribution.
  • the adhesive includes not only an adhesive in a narrow sense, but also an adhesive having a shear storage elastic modulus at 23° C. of less than 1 MPa.
  • the adhesive in a narrow sense means an adhesive having a shear storage elastic modulus at 23° C. of 1 MPa to 500 MPa after irradiation with energy rays or after heat treatment.
  • FIG. 1 is an exploded perspective view schematically showing the circularly polarizing plate according to the first embodiment.
  • the circularly polarizing plate 500 of this embodiment includes a linear polarizer 130 and the optically anisotropic laminate 100 of this embodiment.
  • the optically anisotropic layered product 100 of this embodiment includes a first optically anisotropic layer 110 and a second optically anisotropic layer 120.
  • the optically anisotropic layered product 100 may include any layer (not shown) as necessary.
  • the first optically anisotropic layer 110 satisfies the following formula (1)
  • the second optically anisotropic layer 120 satisfies the following formula (2)
  • the optically anisotropic laminate 100 is Formula (3) is satisfied
  • the first optical anisotropic layer and the second optical anisotropic layer satisfy the following formula (4)
  • the slow axis 111 of the first optical anisotropic layer 110 and the second optical anisotropic layer 110 The angle formed by the slow axis 121 of the anisotropic layer 120 is 85° to 95°.
  • Angles formed by the slow axis 111 of the first optically anisotropic layer 110 and the slow axis 121 of the second optically anisotropic layer 120 which have optical characteristics satisfying the equations (1) to (4).
  • the circularly polarizing plate 500 obtained by combining the optically anisotropic laminate 100 having an angle of 85° to 95° with the linear polarizer 130 in the image display device, the display surface of the image display device is tilted from the tilt direction. When viewed, the reflection of external light can be suppressed, and coloring can be effectively suppressed.
  • nx1 represents a refractive index in the in-plane direction of the first optically anisotropic layer, which gives the maximum refractive index
  • ny1 represents in-plane of the first optically anisotropic layer.
  • Direction which is the refractive index in the direction orthogonal to the direction that gives nx1
  • nz1 represents the refractive index in the thickness direction of the first optically anisotropic layer.
  • the above formula (1) shows that the first optically anisotropic layer can function as a so-called positive A plate or negative B plate.
  • the color of the display surface after the heating test is It is possible to easily realize an image display device in which the change in taste is suppressed.
  • nx2 represents the refractive index in the in-plane direction of the second optically anisotropic layer, which gives the maximum refractive index
  • ny2 represents the in-plane direction of the second optically anisotropic layer.
  • Direction which is the refractive index in the direction orthogonal to the direction that gives nx2
  • nz2 represents the refractive index in the thickness direction of the second optically anisotropic layer.
  • the above formula (2) shows that the second optically anisotropic layer can function as a so-called positive B plate.
  • the second optically anisotropic layer satisfies the expression (2), it is possible to realize an image display device that can effectively suppress coloring due to reflected light.
  • Formula (2) indicates that the second optically anisotropic layer is a layer having different refractive indices (nx2, ny2, and nz2) in three directions, that is, a layer having biaxiality.
  • Re(450), Re(550) and Re(650) represent the in-plane retardation of the optically anisotropic laminate at wavelengths of 450 nm, 550 nm and 650 nm, respectively.
  • the above formula (3) shows that the in-plane retardation of the optically anisotropic laminate has inverse wavelength dispersion.
  • the optically anisotropic laminate can uniformly convert the polarization state of light transmitted through the optically anisotropic laminate in a wide wavelength range. Therefore, it is possible to realize an image display device capable of effectively suppressing coloring due to reflected light in a wide wavelength range.
  • NZ1 represents the NZ coefficient of the first optically anisotropic layer
  • NZ2 represents the NZ coefficient of the second optically anisotropic layer.
  • the sum of NZ1 and NZ2 is ⁇ 0.3 or more, preferably 0 or more, more preferably 0.15 or more, and 0.8 or less, preferably 0.75 or less, more preferably 0.65 or less. Is.
  • NZ1 is a value calculated by (nx1-nz1)/(nx1-ny1), and from equation (1), NZ1 is a positive value.
  • NZ1 is preferably 1.0 or more, more preferably 1.05 or more, preferably 1.3 or less, more preferably 1.2 or less.
  • NZ2 is a value calculated by (nx2-nz2)/(nx2-ny2), and from equation (2), NZ2 is a negative value.
  • NZ2 is preferably ⁇ 2.0 or more, more preferably ⁇ 1.5 or more, preferably ⁇ 0.2 or less, more preferably ⁇ 0.4 or less.
  • the first optically anisotropic layer and the second optically anisotropic layer have optical characteristics that satisfy the following formulas (5) and (6).
  • Re1 (550) represents the in-plane retardation of the first optically anisotropic layer at a wavelength of 550 nm
  • Re1 (450) is the in-plane position of the first optically anisotropic layer at a wavelength of 450 nm
  • Re2 (550) represents the in-plane retardation of the second optically anisotropic layer at a wavelength of 550 nm
  • Re2 (450) represents the in-plane retardation of the second optically anisotropic layer at a wavelength of 450 nm. ..
  • the above formula (5) shows that the wavelength dispersion of the second optically anisotropic layer is larger than that of the first optically anisotropic layer.
  • Re1 (550) represents the in-plane retardation of the first optically anisotropic layer at a wavelength of 550 nm
  • Re2 (550) is the in-plane retardation of the second optically anisotropic layer at a wavelength of 550 nm.
  • Formula (6) shows that Re1 (550) of the first optically anisotropic layer is larger than Re2 (550) of the second optically anisotropic layer.
  • the difference between Re1 (550) and Re2 (550) is preferably 100 nm or more, more preferably 110 nm or more, preferably 180 nm or less, more preferably 160 nm or less.
  • the in-plane retardation Re1 (590) of the first optically anisotropic layer at a wavelength of 590 nm is preferably 240 nm or more, more preferably 260 nm or more, preferably 320 nm or less, more preferably 300 nm or less.
  • an image display device capable of more effectively suppressing coloring of reflected light when the display surface is viewed from the tilt direction is provided. realizable.
  • the in-plane retardation Re2 (590) of the second optically anisotropic layer at a wavelength of 590 nm is preferably 100 nm or more, more preferably 120 nm or more, preferably 190 nm or less, more preferably 170 nm or less.
  • an image display device that can more effectively suppress coloring due to reflected light when the display surface is viewed from the tilt direction is realized. it can.
  • the total light transmittance of the first optically anisotropic layer is preferably 80% or more, more preferably 85% or more, and particularly preferably 90% or more.
  • the total light transmittance of the second optically anisotropic layer is preferably 80% or more, more preferably 85% or more, and particularly preferably 90% or more.
  • the haze of the first optically anisotropic layer is preferably 5% or less, more preferably 3% or less, particularly preferably 1% or less, and ideally 0%.
  • the haze of the second optically anisotropic layer is preferably 5% or less, more preferably 3% or less, particularly preferably 1% or less, and ideally 0%.
  • the thickness of the first optically anisotropic layer and the thickness of the second optically anisotropic layer can be arbitrarily adjusted within the range having the above optical characteristics.
  • the thickness of the first optically anisotropic layer is preferably 0.5 ⁇ m or more, more preferably 1 ⁇ m or more, preferably 150 ⁇ m or less, more preferably 100 ⁇ m or less.
  • the thickness of the second optically anisotropic layer is preferably 0.5 ⁇ m or more, more preferably 1 ⁇ m or more, preferably 150 ⁇ m or less, more preferably 100 ⁇ m or less.
  • the total light transmittance of the optically anisotropic laminate is preferably 80% or more, more preferably 85% or more, and particularly preferably 90% or more.
  • the haze of the optically anisotropic laminate is preferably 5% or less, more preferably 3% or less, particularly preferably 1% or less, and ideally 0%.
  • the thickness of the optically anisotropic laminate can be arbitrarily adjusted within the range having the above optical characteristics.
  • the specific thickness is preferably 5 ⁇ m or more, more preferably 10 ⁇ m or more, particularly preferably 15 ⁇ m or more, preferably 200 ⁇ m or less, more preferably 150 ⁇ m or less, particularly preferably 100 ⁇ m or less.
  • a resin can be mentioned, and among them, a thermoplastic resin is preferable.
  • a resin containing a polymer having a positive intrinsic birefringence value has a negative intrinsic birefringence value. It may be a resin containing a polymer, or a resin containing a polymer having a positive intrinsic birefringence value and a polymer having a negative intrinsic birefringence value.
  • the polymer having a positive intrinsic birefringence value is not particularly limited, but examples thereof include polyolefins such as polyethylene and polypropylene; polyesters such as polyethylene terephthalate and polybutylene terephthalate; polyarylene sulfides such as polyphenylene sulfide; polyvinyl alcohol; polycarbonate; Polyarylate; cellulose ester, polyether sulfone, polysulfone, polyaryl sulfone, polyvinyl chloride, alicyclic structure-containing polymers such as cyclic olefin polymers and norbornene polymers, and rod-shaped liquid crystal polymers.
  • polyolefins such as polyethylene and polypropylene
  • polyesters such as polyethylene terephthalate and polybutylene terephthalate
  • polyarylene sulfides such as polyphenylene sulfide
  • polyvinyl alcohol polycarbonate
  • Polyarylate cellulose ester
  • the polymer having a negative intrinsic birefringence value is not particularly limited, but for example, a homopolymer of a styrene compound, and a polystyrene polymer including a copolymer of a styrene compound and an arbitrary monomer; Examples thereof include an acrylonitrile polymer; a polymethylmethacrylate polymer; or a polycopolymer of these.
  • Examples of the arbitrary monomer copolymerizable with the styrene compound include acrylonitrile, maleic anhydride, methyl methacrylate, and butadiene, and one selected from acrylonitrile, maleic anhydride, methyl methacrylate, and butadiene. The above is preferable.
  • the above-mentioned polymer may be a homopolymer or a copolymer. Moreover, the said polymer may be used individually by 1 type, and may be used in combination of 2 or more types in arbitrary ratios.
  • the resin for forming the first optically anisotropic layer and the second optically anisotropic layer may contain an optional compounding agent in addition to the polymer.
  • the compounding agent include stabilizers such as antioxidants, heat stabilizers, light stabilizers, weather resistance stabilizers, ultraviolet absorbers and near infrared absorbers; plasticizers and the like.
  • the compounding agent one kind may be used, or two or more kinds may be used in combination at an arbitrary ratio.
  • the first optically anisotropic layer may be a layer including a liquid crystal alignment layer.
  • the liquid crystal alignment layer will be described in [1-3-2].
  • the first optically anisotropic layer may be a stretched film of the first resin film.
  • the first resin film preferably contains a resin having a positive intrinsic birefringence value.
  • the resin having such a positive intrinsic birefringence value include a resin containing an alicyclic structure-containing polymer, a resin containing cellulose ester, and a resin containing polycarbonate.
  • the first resin film more preferably contains at least one selected from a resin containing an alicyclic structure-containing polymer, a resin containing a cellulose ester, and a resin containing a polycarbonate.
  • the first optically anisotropic layer may be a layer formed by stretching a film (first resin film) made of a resin having a positive intrinsic birefringence value.
  • the first resin film refers to a resin film that has not yet been stretched to form the first optically anisotropic layer.
  • the alicyclic structure-containing polymer is a polymer having an alicyclic structure in the repeating unit, and is usually an amorphous polymer.
  • As the alicyclic structure-containing polymer both a polymer having an alicyclic structure in its main chain and a polymer having an alicyclic structure in its side chain can be used.
  • Examples of the alicyclic structure include a cycloalkane structure and a cycloalkene structure, and the cycloalkane structure is preferable from the viewpoint of thermal stability and the like.
  • the number of carbon atoms constituting one repeating unit of the alicyclic structure is not particularly limited, but preferably 4 or more, more preferably 5 or more, particularly preferably 6 or more, preferably 30 or less, The number is more preferably 20 or less, and particularly preferably 15 or less.
  • the proportion of repeating units having an alicyclic structure in the alicyclic structure-containing polymer may be appropriately selected according to the purpose of use, but is preferably 50% by weight or more, more preferably 70% by weight or more, particularly preferably It is 90% by weight or more.
  • Examples of the alicyclic structure-containing polymer include (1) norbornene polymer, (2) monocyclic cycloolefin polymer, (3) cyclic conjugated diene polymer, (4) vinyl alicyclic hydrocarbon polymer, And hydrogenated products thereof.
  • a cyclic olefin polymer and a norbornene polymer are more preferable.
  • Examples of the norbornene polymer include ring-opening polymers of norbornene monomers, ring-opening copolymers of norbornene monomers with other monomers capable of ring-opening copolymerization, and hydrogenated products thereof; addition polymers of norbornene monomers, Examples thereof include addition copolymers of norbornene monomers and other monomers copolymerizable therewith.
  • a hydrogenated product of a ring-opening polymer of a norbornene monomer is particularly preferable from the viewpoint of transparency.
  • the alicyclic structure-containing polymer is selected from known polymers disclosed in, for example, JP-A-2002-321302.
  • a lower fatty acid ester of cellulose eg, cellulose acetate, cellulose acetate butyrate and cellulose acetate propionate
  • the lower fatty acid means a fatty acid having 6 or less carbon atoms per molecule.
  • Cellulose acetate includes triacetyl cellulose (TAC) and cellulose diacetate (DAC).
  • the total acyl group substitution degree of the cellulose ester is preferably 2.20 or more and 2.70 or less, and more preferably 2.40 or more and 2.60 or less.
  • the total acyl group can be measured according to ASTM D817-91.
  • the weight average degree of polymerization of the cellulose ester is preferably 350 or more and 800 or less, more preferably 370 or more and 600 or less.
  • the number average molecular weight of the cellulose ester is preferably 60,000 or more and 230,000 or less, more preferably 70,000 or more and 230,000 or less.
  • polycarbonate examples include polymers having a structural unit derived from a dihydroxy compound and a carbonate structure (a structure represented by —O—(C ⁇ O)—O—).
  • dihydroxy compound examples include bisphenol A.
  • the constitutional unit derived from the dihydroxy compound contained in the polycarbonate may be one type or two or more types.
  • the first optically anisotropic layer contains a resin containing triacetyl cellulose. Since the retardation of a film formed of a resin containing triacetyl cellulose generally has a reverse wavelength dispersibility, it is possible to realize an image display device that can more effectively suppress coloring due to reflected light in a wide wavelength range.
  • the first optically anisotropic layer is made of a resin containing triacetyl cellulose
  • the first optically anisotropic layer is preferably a layer formed by a solution casting method. Thereby, the first optically anisotropic layer satisfying the formula (1) can be easily manufactured.
  • the first optically anisotropic layer may be a layer including a liquid crystal alignment layer.
  • the liquid crystal alignment layer is a cured product layer obtained by curing a layer of a liquid crystal composition containing an aligned liquid crystal compound. Therefore, since the liquid crystal alignment layer is formed of the cured product of the liquid crystal composition, it contains molecules of the liquid crystal compound.
  • the liquid crystal compound preferably has polymerizability. Therefore, the liquid crystal compound preferably has a molecule containing a polymerizable group such as an acryloyl group, a methacryloyl group, and an epoxy group.
  • the number of polymerizable groups per molecule of the liquid crystal compound may be one, but is preferably two or more.
  • the polymerizable liquid crystal compound can be polymerized in a state of exhibiting a liquid crystal phase so as not to change the direction of the maximum refractive index in the refractive index ellipsoid of the molecules in the liquid crystal phase. Therefore, it is possible to fix the alignment state of the liquid crystal compound in the liquid crystal alignment layer or increase the polymerization degree of the liquid crystal compound to enhance the mechanical strength of the liquid crystal alignment layer.
  • the molecular weight of the liquid crystal compound is preferably 300 or more, more preferably 500 or more, particularly preferably 800 or more, preferably 2000 or less, more preferably 1700 or less, and particularly preferably 1500 or less.
  • a liquid crystal compound having a molecular weight in such a range is used, the coatability of the liquid crystal composition can be made particularly good.
  • the birefringence ⁇ n of the liquid crystal compound at a measurement wavelength of 590 nm is preferably 0.01 or more, more preferably 0.03 or more, preferably 0.15 or less, more preferably 0.10.
  • a liquid crystal compound having a birefringence ⁇ n in such a range is used, it is easy to obtain a liquid crystal cured layer with few alignment defects.
  • the liquid crystal compound may be used alone or in combination of two or more kinds at an arbitrary ratio.
  • liquid crystal compounds examples include liquid crystal compounds represented by the following formula (I).
  • Ar has at least one of an aromatic heterocycle, a heterocycle, and an aromatic hydrocarbon ring, and is an optionally substituted divalent organic group having 6 to 67 carbon atoms.
  • aromatic heterocycle include 1H-isoindole-1,3(2H)-dione ring, 1-benzofuran ring, 2-benzofuran ring, acridine ring, isoquinoline ring, imidazole ring, indole ring, oxadiazole ring.
  • a 1 , A 2 , B 1 and B 2 are each independently a cyclic aliphatic group which may have a substituent, and an aromatic group which may have a substituent.
  • the number of carbon atoms of the group represented by A 1 , A 2 , B 1 and B 2 (including the number of carbon atoms of the substituent) is usually 3 to 100 each independently.
  • a 1 , A 2 , B 1 and B 2 each independently have a cycloaliphatic group having 5 to 20 carbon atoms which may have a substituent, or a substituent.
  • Aromatic groups having 2 to 20 carbon atoms are preferable.
  • Examples of the cycloaliphatic group for A 1 , A 2 , B 1 and B 2 include a cyclopentane-1,3-diyl group, a cyclohexane-1,4-diyl group, a cycloheptane-1,4-diyl group, Cycloalkanediyl group having 5 to 20 carbon atoms such as cyclooctane-1,5-diyl group; carbon atom such as decahydronaphthalene-1,5-diyl group, decahydronaphthalene-2,6-diyl group A bicycloalkanediyl group of the number 5 to 20; and the like.
  • an optionally substituted cycloalkanediyl group having 5 to 20 carbon atoms is preferable, a cyclohexanediyl group is more preferable, and a cyclohexane-1,4-diyl group is particularly preferable.
  • the cycloaliphatic group may be in trans form, cis form, or a mixture of cis form and trans form. Among them, the trans form is more preferable.
  • Examples of the substituent that the cycloaliphatic group in A 1 , A 2 , B 1 and B 2 may have include a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, Examples thereof include a nitro group and a cyano group.
  • the number of substituents may be one or more. Further, the plurality of substituents may be the same as or different from each other.
  • Examples of the aromatic group for A 1 , A 2 , B 1 and B 2 include 1,2-phenylene group, 1,3-phenylene group, 1,4-phenylene group, 1,4-naphthylene group, 1, Aromatic hydrocarbon ring group having 6 to 20 carbon atoms such as 5-naphthylene group, 2,6-naphthylene group, 4,4'-biphenylene group; furan-2,5-diyl group, thiophene-2,5 -Diyl group, pyridine-2,5-diyl group, pyrazine-2,5-diyl group and the like; aromatic heterocyclic group having 2 to 20 carbon atoms; and the like.
  • an aromatic hydrocarbon ring group having 6 to 20 carbon atoms is preferable, a phenylene group is more preferable, and a 1,4-phenylene group is particularly preferable.
  • the substituent which the aromatic group in A 1 , A 2 , B 1 and B 2 may have is, for example, the same as the substituent which the cyclic aliphatic group in A 1 , A 2 , B 1 and B 2 may have.
  • An example is given.
  • the number of substituents may be one or more. Further, the plurality of substituents may be the same as or different from each other.
  • R 22 and R 23 each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
  • G 1 and G 2 are each independently an aliphatic hydrocarbon group having 1 to 20 carbon atoms; and a methylene group contained in the aliphatic hydrocarbon group having 3 to 20 carbon atoms.
  • the hydrogen atom contained in the organic group of G 1 and G 2 may be substituted with an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, or a halogen atom.
  • the methylene groups (—CH 2 —) at both ends of G 1 and G 2 are not replaced with —O— or —C( ⁇ O)—.
  • Specific examples of the aliphatic hydrocarbon group having 1 to 20 carbon atoms in G 1 and G 2 include an alkylene group having 1 to 20 carbon atoms.
  • Specific examples of the aliphatic hydrocarbon group having 3 to 20 carbon atoms in G 1 and G 2 include an alkylene group having 3 to 20 carbon atoms.
  • P 1 and P 2 each independently represent a polymerizable group.
  • the polymerizable group for P 1 and P 2 include a group represented by CH 2 ⁇ CR 31 —C( ⁇ O)—O— such as an acryloyloxy group and a methacryloyloxy group; a vinyl group; a vinyl ether group; p-stilbene group; acryloyl group; methacryloyl group; carboxyl group; methylcarbonyl group; hydroxyl group; amide group; alkylamino group having 1 to 4 carbon atoms; amino group; epoxy group; oxetanyl group; aldehyde group; isocyanate group; thio Isocyanate group; and the like.
  • R 31 represents a hydrogen atom, a methyl group, or a chlorine atom.
  • the liquid crystal compound represented by the formula (I) can be produced, for example, by the reaction of a hydrazine compound and a carbonyl compound described in WO2012/147904.
  • liquid crystal compound represented by the formula (I) include compounds represented by the following formulas.
  • the liquid crystal composition may further contain an optional component in combination with the liquid crystal compound, if necessary.
  • an optional component in combination with the liquid crystal compound, if necessary.
  • the arbitrary component one type may be used alone, or two or more types may be used in combination at an arbitrary ratio.
  • the liquid crystal composition may contain a polymerization initiator as an optional component.
  • a polymerization initiator either a thermal polymerization initiator or a photopolymerization initiator may be used.
  • the liquid crystal composition may include a surfactant as an optional component.
  • the surfactant is preferably a surfactant containing a fluorine atom in the molecule.
  • the liquid crystal composition may include, for example, an antioxidant as an optional component.
  • an antioxidant By using an antioxidant, gelation of the liquid crystal composition can be suppressed, so that the pot life of the liquid crystal composition can be extended.
  • the antioxidant one kind may be used alone, and two kinds may be used in combination at an arbitrary ratio.
  • the liquid crystal composition may include a solvent as an optional component.
  • a solvent those capable of dissolving the reverse dispersion liquid crystal compound are preferable.
  • An organic solvent is usually used as such a solvent.
  • liquid crystal composition may include include metals; metal complexes; metal oxides such as titanium oxide; coloring agents such as dyes and pigments; luminescent materials such as fluorescent materials and phosphorescent materials; leveling agents; Examples include thixotropic agents, gelling agents, polysaccharides, ultraviolet absorbers, infrared absorbers, antioxidants, ion exchange resins, and the like. The amount of each of these components may be 0.1 to 20 parts by weight based on 100 parts by weight of the liquid crystal compound.
  • the curing of the liquid crystal composition is usually achieved by polymerizing the polymerizable compound contained in the liquid crystal composition. Therefore, the liquid crystal alignment layer usually contains a polymer of a part or all of the components included in the liquid crystal composition. Therefore, when the liquid crystal compound is polymerizable, the liquid crystal alignment layer may be a layer containing a polymer of the liquid crystal compound. Usually, the liquid crystallinity of the liquid crystal compound is lost by polymerization, but in the present application, the liquid crystal compound thus polymerized is also included in the term “liquid crystal compound contained in the liquid crystal alignment layer”.
  • liquid crystal alignment layer In the liquid crystal alignment layer, the fluidity of the liquid crystal composition is lost. Therefore, usually, in the liquid crystal alignment layer, the alignment state of the liquid crystal compound can be fixed.
  • liquid crystal compound having a fixed alignment state includes a polymer of the above liquid crystal compound.
  • the liquid crystal alignment layer may include molecules of the liquid crystal compound in which the alignment state is not fixed by combining with molecules of the liquid crystal compound in which the alignment state is fixed, but all of the molecules of the liquid crystal compound included in the liquid crystal alignment layer are included. It is preferable that the orientation state is fixed.
  • the method for forming the liquid crystal alignment layer is not particularly limited, for example, a film serving as a base material, a step of forming a layer of a liquid crystal composition containing a liquid crystal compound, a step of aligning the liquid crystal compound contained in the layer of the liquid crystal composition, Alternatively, it can be formed by performing a step of curing the layer of the liquid crystal composition.
  • the second optically anisotropic layer may be a stretched film of the second resin film.
  • the second resin film preferably contains a resin having a negative intrinsic birefringence value.
  • the second resin film formed of the resin can be stretched to easily produce the second optically anisotropic layer satisfying the formula (2). Therefore, the second optically anisotropic layer may be a layer formed by stretching a film (second resin film) made of a resin having a negative intrinsic birefringence value.
  • the second resin film refers to the resin film that has not yet been stretched to form the second optically anisotropic layer.
  • the resin having a negative intrinsic birefringence value includes a polymer having a negative intrinsic birefringence value.
  • a polystyrene polymer is preferable, and in terms of high heat resistance, styrene or a styrene derivative and maleic anhydride Copolymers are particularly preferred.
  • the amount of the maleic anhydride unit is preferably 5 parts by weight or more, more preferably 10 parts by weight or more, particularly preferably 15 parts by weight or more, and preferably 30 parts by weight with respect to 100 parts by weight of the polystyrene polymer. It is not more than 28 parts by weight, more preferably not more than 28 parts by weight, particularly preferably not more than 26 parts by weight.
  • the maleic anhydride unit is a structural unit having a structure formed by polymerizing maleic anhydride.
  • the proportion of the polymer in the resin having a negative intrinsic birefringence value is preferably 50% by weight to 100% by weight, more preferably 70% by weight to 100% by weight, and particularly preferably 90% by weight to 100% by weight.
  • the second optically anisotropic layer can exhibit appropriate optical characteristics.
  • the glass transition temperature of the resin having a negative intrinsic birefringence value is preferably 80° C. or higher, more preferably 90° C. or higher, further preferably 100° C. or higher, especially 110° C. or higher, particularly preferably 120° C. or higher. ..
  • Such a high glass transition temperature of the resin having a negative intrinsic birefringence value can reduce orientation relaxation of the resin having a negative intrinsic birefringence value.
  • the upper limit of the glass transition temperature of the resin having a negative intrinsic birefringence value is not particularly limited, but is usually 200° C. or lower.
  • the glass transition temperature can be measured by using a differential scanning calorimeter at a temperature rising rate of 10° C./min based on JIS K6911.
  • the second optically anisotropic layer including a layer made of a resin having a negative intrinsic birefringence value is combined with a layer containing a resin having a negative intrinsic birefringence value to obtain a resin having a negative intrinsic birefringence value. It is preferable to provide a protective layer capable of protecting the layer containing.
  • the protective layer is not particularly limited, but for example, a layer made of a resin having a positive intrinsic birefringence value can be used.
  • the in-plane retardation and the retardation in the thickness direction of the protective layer are preferably close to zero.
  • the glass transition temperature of the resin contained in the protective layer is set to the glass transition temperature of the resin having a negative intrinsic birefringence value. There is a method of lowering it.
  • the protective layer may be provided on only one side of the layer made of a resin having a negative intrinsic birefringence value, or may be provided on both sides.
  • one of the first optically anisotropic layer and the second optically anisotropic layer is composed of a ⁇ /2 plate, and the other is composed of a ⁇ /4 plate.
  • the ⁇ /2 plate is an optical member having an in-plane retardation of usually 200 nm or more and usually 300 nm or less at a measurement wavelength of 590 nm.
  • the ⁇ /4 plate is an optical member having an in-plane retardation of usually 75 nm or more and usually 154 nm or less at a measurement wavelength of 590 nm.
  • a broadband ⁇ /4 plate can be realized by combining the ⁇ /2 plate and the ⁇ /4 plate.
  • the circularly polarizing plate according to the present embodiment can exhibit a function of absorbing one of right circularly polarized light and left circularly polarized light and transmitting the remaining light in a wide wavelength range. Therefore, the circularly polarizing plate provided with the optically anisotropic laminate of such an aspect makes it possible to reduce reflection of light in a wide wavelength range in both the front direction and the tilt direction.
  • the optically anisotropic laminate of the present embodiment has a step 1 of stretching a first resin film containing a resin having a positive intrinsic birefringence value to obtain a first optically anisotropic layer, and a negative intrinsic birefringence value.
  • Step 1 is a step of stretching a first resin film containing a resin having a positive intrinsic birefringence value to obtain a first optically anisotropic layer.
  • the first resin film containing a resin having a positive intrinsic birefringence value used in step 1 can be produced by a melt molding method or a solution casting method, and the melt molding method is preferable. Further, among the melt molding methods, the extrusion molding method, the inflation molding method or the press molding method is preferable, and the extrusion molding method is particularly preferable.
  • the first resin film is obtained as a long resin film.
  • the first resin film is obtained as a long resin film.
  • the stretching method of the first resin film an appropriate method can be arbitrarily adopted depending on the optical characteristics to be expressed by stretching.
  • the stretching method of the first resin film is not particularly limited, but unidirectional stretching (uniaxial stretching) is preferable.
  • unidirectional stretching By unidirectionally stretching the first resin film, the uniaxiality of the layer containing the resin having a positive intrinsic birefringence value can be enhanced, and NZ1 can be brought close to 1.0.
  • Unidirectional stretching includes, for example, free-end uniaxial stretching and fixed-end uniaxial stretching.
  • the first resin film may be stretched once in one direction or two directions.
  • the stretching direction of the first resin film is not particularly limited. Stretching of the first resin film may include stretching in an oblique direction.
  • the first optically anisotropic layer as an obliquely stretched film can be obtained by a production method including stretching in an oblique direction.
  • the obliquely stretched film means a film produced by a production method including stretching in an oblique direction.
  • the obliquely stretched film develops a slow axis that is neither parallel nor perpendicular to the width direction. Therefore, in the first optically anisotropic layer as the obliquely stretched film, a slow axis forming a predetermined angle with respect to the width direction can be easily expressed.
  • the first optically anisotropic layer as the obliquely stretched film is laminated with the polarizing film having the transmission axis in the width direction and the second optically anisotropic layer by roll-to-roll to easily manufacture a circularly polarizing plate. it can.
  • the stretch ratio of the first resin film is preferably 1.1 times or more, more preferably 1.3 times or more, particularly preferably 1.5 times or more, preferably 4 times or less, more preferably 3 times or less, It is particularly preferably 2.5 times or less.
  • the stretch ratio of the first resin film is preferably 1.1 times or more, more preferably 1.3 times or more, particularly preferably 1.5 times or more, preferably 4 times or less, more preferably 3 times or less, It is particularly preferably 2.5 times or less.
  • the stretching temperature of the first resin film is preferably Tg 1 °C or higher, more preferably “Tg 1 +2 °C” or higher, particularly preferably “Tg 1 +5 °C” or higher, preferably “Tg 1 +40 °C” or lower, It is more preferably “Tg 1 +35°C” or lower, and particularly preferably "Tg 1 +30°C” or lower.
  • Tg 1 represents the glass transition temperature of the resin having a positive intrinsic birefringence value.
  • step 1 method for producing the first optically anisotropic layer
  • any step other than the steps described above may be further performed.
  • a trimming step of cutting out the first optically anisotropic layer into a desired shape may be performed. ..
  • a single-wafer first optically anisotropic layer having a desired shape is obtained.
  • a step of providing a protective layer on the first optically anisotropic layer may be performed.
  • Step 2 is a step of stretching a second resin film containing a resin having a negative intrinsic birefringence value to obtain a second optically anisotropic layer.
  • the second resin film containing a resin having a negative intrinsic birefringence value used in step 2 can be produced by a melt molding method or a solution casting method, and the melt molding method is preferable. Further, among the melt molding methods, the extrusion molding method, the inflation molding method or the press molding method is preferable, and the extrusion molding method is particularly preferable.
  • the second resin film is, for example, a multilayer film including a layer made of a resin having a negative intrinsic birefringence value and a protective layer, coextrusion T-die method, coextrusion inflation method, coextrusion lamination method, or other coextrusion method.
  • a method such as a molding method; a film lamination method such as dry lamination; a coating molding method in which a certain layer is coated with a resin solution forming the other layer can be used.
  • the coextrusion molding method is preferable from the viewpoint of good production efficiency and preventing volatile components such as a solvent from remaining in the second optically anisotropic layer.
  • the coextrusion molding methods the coextrusion T-die method is preferable.
  • the co-extrusion T-die method includes a feed block method and a multi-manifold method, but the multi-manifold method is more preferable in that the variation in layer thickness can be reduced.
  • the second resin film is obtained as a long resin film.
  • some or all of the steps can be performed in-line when the second optically anisotropic layer is manufactured, so that the manufacturing is simple and easy. It can be done efficiently.
  • bidirectional stretching includes, for example, sequential biaxial stretching and simultaneous biaxial stretching.
  • the stretching direction of the second resin film is not particularly limited. Stretching of the second resin film preferably includes stretching in an oblique direction.
  • the second optically anisotropic layer as an obliquely stretched film can be obtained by a production method including stretching in an oblique direction. Usually, the obliquely stretched film develops a slow axis that is neither parallel nor perpendicular to the width direction. Therefore, in the second optically anisotropic layer as the obliquely stretched film, a slow axis forming a predetermined angle with respect to the width direction can be easily expressed.
  • the second optically anisotropic layer as the obliquely stretched film is laminated with the polarizing film having the transmission axis in the width direction and the first optically anisotropic layer by roll-to-roll to easily manufacture the circularly polarizing plate. it can.
  • the draw ratio of the second resin film is preferably 1.1 times or more, more preferably 1.2 times or more, particularly preferably 1.3 times or more, preferably 4 times or less, more preferably 3 times or less, It is particularly preferably 2.5 times or less.
  • the draw ratio of the second resin film is preferably 1.1 times or more, more preferably 1.2 times or more, particularly preferably 1.3 times or more, preferably 4 times or less, more preferably 3 times or less, It is particularly preferably 2.5 times or less.
  • the stretching temperature of the second resin film is preferably Tg 2 °C or higher, more preferably “Tg 2 +2 °C” or higher, particularly preferably “Tg 2 +5 °C” or higher, preferably “Tg 2 +40 °C” or lower, It is more preferably “Tg 2 +35°C” or lower, and particularly preferably "Tg 2 +30°C” or lower.
  • Tg 2 represents the glass transition temperature of a resin having a negative intrinsic birefringence value.
  • Step 2 may be performed at the same time as step 1, or may be performed before step 1. Further, in the step 2 (method for producing the second optically anisotropic layer), any step may be further performed in addition to the steps described above. For example, the same steps as the arbitrary steps exemplified in Step 1 (method for producing first optically anisotropic layer) may be performed.
  • Step 3 is a step of stacking the first optically anisotropic layer and the second optically anisotropic layer.
  • the first optically anisotropic layer and the second optically anisotropic layer are formed by the slow axis of the first optically anisotropic layer and the slow axis of the second optically anisotropic layer. Stack so that the angle is 85° to 95°. That is, the slow axis of the first optically anisotropic layer and the slow axis of the second optically anisotropic layer are stacked so as to be orthogonal to each other.
  • the angle formed by the slow axis of the first optically anisotropic layer and the slow axis of the second optically anisotropic layer is preferably 90°, for example ⁇ 5°, ⁇ 3°, ⁇ 2° or An error within a range of ⁇ 1° may be included. Therefore, the angle formed by the slow axis of the first optically anisotropic layer and the slow axis of the second optically anisotropic layer is, for example, 85° to 95°, 87° to 93°, 88° to 92°. , Or 89° to 91°.
  • An optical anisotropic laminate can be manufactured by stacking the first optical anisotropic layer and the second optical anisotropic layer and then bonding the two layers together.
  • a suitable adhesive may be used for bonding.
  • the adhesive for example, an adhesive similar to the adhesive that can be used for manufacturing the polarizing plate described below can be used. This laminating step is an optional step.
  • the circularly polarizing plate 500 of the present embodiment includes the linear polarizer 130 and the above-mentioned optically anisotropic laminate 100.
  • the circularly polarizing plate 500 of this embodiment By providing the circularly polarizing plate 500 of this embodiment on the display surface of the image display device, reflection of external light can be suppressed.
  • the circularly polarizing plate 500 of the present embodiment including the optically anisotropic layered product 100 of the present embodiment when the display surface is viewed from the tilt direction, reflection of external light is suppressed and coloring is effectively performed. Can be suppressed.
  • the circularly polarizing plate 500 of the present embodiment includes a linear polarizer 130, a first optical anisotropic layer 110, and the second optical anisotropic layer 120 in this order.
  • 132 is an axis obtained by projecting the transmission axis 131 of the linear polarizer 130 onto the first optical anisotropic layer 110
  • 133 is the transmission axis 131 of the linear polarizer 130 to the second optical anisotropic layer 120.
  • the angle ⁇ A1 is an angle formed by the slow axis 111 of the first optically anisotropic layer 110 clockwise with respect to the transmission axis 131 of the linear polarizer 130.
  • the angle ⁇ B1 is an angle formed by the slow axis 121 of the second optically anisotropic layer 120 clockwise with respect to the transmission axis 131 of the linear polarizer 130.
  • the angle ⁇ A1 formed by the transmission axis 131 of the linear polarizer 130 and the slow axis 111 of the first optically anisotropic layer 110 is preferably close to 45°.
  • the angle ⁇ A1 is specifically preferably 45° ⁇ 5° (ie, preferably 40°-50°), more preferably 45° ⁇ 4° (ie, more preferably 41°-49°), particularly It is preferably 45° ⁇ 3° (that is, particularly preferably 42° to 48°).
  • the slow axis 111 of the first optical anisotropic layer 110 makes the angle ⁇ A1 clockwise with respect to the transmission axis 131 of the linear polarizer 130, the transmission of the linear polarizer 130 is shown.
  • the direction in which the slow axis 111 of the first optical anisotropic layer 110 forms the angle ⁇ A1 with respect to the axis 131 may be clockwise or counterclockwise. Furthermore, the direction in which the slow axis 121 of the second optical anisotropic layer 120 forms the angle ⁇ B1 with respect to the transmission axis 131 of the linear polarizer 130 may be clockwise or counterclockwise.
  • the angle between the absorption axis (not shown) of the linear polarizer 130 and the slow axis 111 of the first optically anisotropic layer 110 is preferably close to 45°.
  • the angle between the absorption axis of the linear polarizer 130 and the slow axis 111 of the first optical anisotropic layer 110 is specifically 45° ⁇ 5° (that is, preferably 40°-50°). More preferably 45° ⁇ 4° (ie, more preferably 41° to 49°), particularly preferably 45° ⁇ 3° (ie, particularly preferably 42° to 48°).
  • the direction in which the slow axis 111 of the first optical anisotropic layer 110 forms the angle with respect to the absorption axis of the linear polarizer 130 may be clockwise or counterclockwise.
  • any linear polarizer can be used as the linear polarizer 130.
  • the linear polarizer a film obtained by adsorbing iodine or a dichroic dye on a polyvinyl alcohol film and then unidirectionally stretching it in a boric acid bath; A film obtained by adsorbing and stretching, and further modifying a part of polyvinyl alcohol units in the molecular chain into polyvinylene units.
  • the linear polarizer include a polarizer having a function of separating polarized light into reflected light and transmitted light, such as a grid polarizer and a multilayer polarizer.
  • the linear polarizer 130 is preferably a polarizer containing polyvinyl alcohol.
  • the degree of polarization of the linear polarizer 130 is not particularly limited, but is preferably 98% or more, more preferably 99% or more.
  • the thickness of the linear polarizer 130 is preferably 5 ⁇ m to 80 ⁇ m.
  • the circularly polarizing plate may further include an adhesive layer for bonding the linear polarizer and the optically anisotropic laminate.
  • an adhesive layer made of an adhesive adhesive may be used, or a layer formed by curing a curable adhesive may be used.
  • a thermosetting adhesive may be used as the curable adhesive, but a photocurable adhesive is preferably used.
  • the photocurable adhesive one containing a polymer or a reactive monomer can be used. Further, the adhesive may contain a solvent, a photopolymerization initiator, other additives, etc., if necessary.
  • Photo-curable adhesives are adhesives that can be cured by irradiation with light such as visible light, ultraviolet rays, and infrared rays. Among them, an adhesive that can be cured by ultraviolet rays is preferable because it is easy to operate.
  • the thickness of the adhesive layer is preferably 0.5 ⁇ m or more, more preferably 1 ⁇ m or more, preferably 30 ⁇ m or less, more preferably 20 ⁇ m or less, still more preferably 10 ⁇ m or less.
  • the above-mentioned circularly polarizing plate may further include an optional layer.
  • the optional layer include a polarizer protective film layer, a hard coat layer such as an impact-resistant polymethacrylate resin layer, a mat layer that improves the slipperiness of the film, a reflection suppressing layer, an antifouling layer, and an antistatic layer. Can be mentioned. These optional layers may be provided in only one layer or in two or more layers.
  • the circularly polarizing plate of this embodiment can be used for an image display device.
  • the image display device of the present embodiment includes the circularly polarizing plate of the present embodiment and an organic electroluminescence element (hereinafter, also referred to as “organic EL element” as appropriate).
  • This image display device usually comprises a linear polarizer, an optically anisotropic laminate and an organic EL element in this order.
  • the image display device may include a linear polarizer, a first optical anisotropic layer, a second optical anisotropic layer and an organic EL element in this order.
  • the organic EL element includes a transparent electrode layer, a light emitting layer, and an electrode layer in this order, and the light emitting layer may generate light when a voltage is applied from the transparent electrode layer and the electrode layer.
  • materials forming the organic light emitting layer include polyparaphenylene vinylene-based materials, polyfluorene-based materials, and polyvinylcarbazole-based materials.
  • the light emitting layer may have a laminated body of a plurality of layers having different emission colors or a mixed layer in which a certain dye layer is doped with different dyes.
  • the organic EL element may include functional layers such as a hole injection layer, a hole transport layer, an electron injection layer, an electron transport layer, an equipotential surface forming layer, and a charge generation layer.
  • the above image display device can suppress reflection of external light on the display surface. Specifically, the light incident from the outside of the device becomes circularly polarized light because only part of the linearly polarized light passes through the linear polarizer and then it passes through the optically anisotropic laminate. The circularly polarized light is reflected by a constituent element (a reflective electrode (not shown) in the organic EL element, etc.) that reflects light in the display device, and again passes through the optically anisotropic laminated body to make incident linearly polarized light.
  • the linearly polarized light has a vibration direction orthogonal to the vibration direction of, and does not pass through the linear polarizer.
  • the direction of vibration of linearly polarized light means the direction of vibration of the electric field of linearly polarized light. Thereby, the function of suppressing reflection is achieved.
  • the image display device since the optically anisotropic laminate has predetermined optical characteristics, the reflection suppressing function can be exerted not only in the front direction of the display surface but also in the tilt direction. And thereby, the coloring of the display surface due to the reflected light can be suppressed. Therefore, the image display device can effectively suppress reflection of external light and suppress coloring in both the front direction and the tilt direction of the display surface.
  • the degree of coloring can be evaluated by the color difference ⁇ E * ab between the chromaticity measured by observing the display surface from the tilt direction and the chromaticity of the black display surface without reflection.
  • the chromaticity is obtained by measuring the spectrum of the light reflected on the display surface and multiplying the spectral sensitivity (color matching function) corresponding to the human eye from this spectrum to obtain the tristimulus values X, Y, and Z. It can be obtained by calculating the degree (a * , b * , L * ).
  • the color difference ⁇ E * ab is the chromaticity (a0 * , b0 * , L0 * ) when the display surface is not illuminated by external light and the chromaticity (a1 when illuminated by external light. * , b1 * , L1 * ) can be obtained from the following formula (X).
  • the coloring of the display surface due to the reflected light may differ depending on the azimuth angle in the viewing direction. Therefore, when observed from the tilt direction of the display surface, the measured chromaticity may differ depending on the azimuth angle of the observation direction, and thus the color difference ⁇ E * ab may also differ. Therefore, as described above, when evaluating the degree of coloring when observed from the tilt direction of the display surface, the evaluation of coloring is performed by the average value of the color difference ⁇ E * ab obtained by observing from a plurality of azimuth directions. It is preferable to carry out. Specifically, in 5 ° increments in azimuth, the azimuth angle phi (see FIG.
  • FIG. 2 is an exploded perspective view schematically showing the circularly polarizing plate 600 according to the second embodiment.
  • the optically anisotropic laminate 200 of the present embodiment is provided in the same manner as in the first embodiment except that the arrangement of the second optically anisotropic layer 120 and the first optically anisotropic layer 110 is different from that of the first embodiment. Has been.
  • the same components as those in the first embodiment are designated by the same reference numerals, and the duplicated description will be omitted.
  • the circularly polarizing plate 600 of the present embodiment includes a linear polarizer 130 and the optically anisotropic laminated body 200 of the present embodiment. As shown in FIG. 2, the circularly polarizing plate 600 of the present embodiment includes a linear polarizer 130, the second optically anisotropic layer 120, and the first optically anisotropic layer 110 in this order.
  • 132 is an axis obtained by projecting the transmission axis of the linear polarizer onto the first optically anisotropic layer 110
  • 133 is an axis obtained by projecting the transmission axis of the linear polarizer onto the second optically anisotropic layer 120.
  • the angle ⁇ A2 is an angle formed by the slow axis 111 of the first optically anisotropic layer 110 clockwise with respect to the transmission axis 131 of the linear polarizer 130.
  • the angle ⁇ B2 is an angle formed by the slow axis 121 of the second optically anisotropic layer 120 clockwise with respect to the transmission axis 131 of the linear polarizer 130.
  • the angles ⁇ A2 and ⁇ B2 are preferably in the same ranges as the angles ⁇ A1 and ⁇ B1 described in the first embodiment, respectively.
  • the circularly polarizing plate of this embodiment can be used in an image display device.
  • An image display device usually includes a linear polarizer, an optically anisotropic laminate and an organic EL element in this order. Therefore, the image display device including the circularly polarizing plate of the present embodiment may include the linear polarizer, the second optical anisotropic layer, the first optical anisotropic layer, and the organic EL element in this order.
  • the optically anisotropic laminate 200 has optical characteristics satisfying the above formulas (1) to (4), and has the slow axis 111 of the first optically anisotropic layer 110 and the first axis. 2
  • the angle formed by the slow axis 121 of the optically anisotropic layer 120 is 85° to 95°. Therefore, by providing the image display device with the circularly polarizing plate 600 obtained by combining such an optically anisotropic laminate 200 with the linear polarizer 130, when the display surface of the image display device is viewed from the tilt direction. Coloring can be effectively suppressed by suppressing reflection of external light.
  • the in-plane retardations Re1(450), Re1(550), Re1(590), Re1(650), and wavelength 590 nm at wavelengths of 450 nm, 550 nm, 590 nm, and 650 nm are used.
  • the retardation Rth1 (590) in the thickness direction and the slow axis direction were measured.
  • the in-plane retardations Re2(450), Re2(550), Re2(590), Re2(650), and wavelength at wavelengths of 450 nm, 550 nm, 590 nm, and 650 nm are used.
  • the retardation Rth2 (590) in the thickness direction at 590 nm and the slow axis direction were measured.
  • Re1(450)/Re1(550) and Re1(450)/Re1(550) were calculated using the obtained in-plane retardation.
  • the NZ coefficient (NZ1, NZ2) was calculated from the obtained ratio of the in-plane retardation and the thickness direction retardation.
  • the in-plane retardations Re(450), Re(550), and Re(650) at the wavelengths of 450 nm, 550 nm, and 650 nm of the optically anisotropic laminate are the first optically anisotropic layer and the second optically anisotropic layer. It was calculated from the optical characteristic values of the optically anisotropic layer.
  • a circularly polarizing plate having a second optically anisotropic layer, a first optically anisotropic layer and a polarizing film on the reflecting surface of a mirror having a planar reflecting surface in this order from the reflecting surface side. was set up.
  • the first optically anisotropic layer and the second optically anisotropic layer those used in each Example and Comparative Example were set.
  • the polarizing film a generally used polarizing plate having a polarization degree of 99.99% was set.
  • the mirror an ideal mirror capable of specularly reflecting the incident light with a reflectance of 100% was set.
  • FIG. 3 is a perspective view schematically showing a state of the evaluation model set when the color space coordinates are calculated in the simulations of the example and the comparative example.
  • the calculation of the color difference ⁇ E * ab was performed in the observation direction 20 in which the polar angle ⁇ with respect to the reflecting surface 10 was 0°, and the color difference ⁇ E * ab in the front direction was obtained.
  • the polar angle ⁇ represents an angle formed with respect to the normal direction 11 of the reflecting surface 10.
  • the calculation of the color difference ⁇ E * ab was performed in the observation direction 20 in which the polar angle ⁇ with respect to the reflecting surface 10 was 60°.
  • the azimuth angle ⁇ represents an angle formed by a direction parallel to the reflecting surface 10 with respect to a certain reference direction 12 parallel to the reflecting surface 10.
  • Example and Comparative Example A large number of people conducted the above observations, and calculated the total points given for each Example and Comparative Example. Examples and comparative examples were arranged in the order of the above total points, and the range of the total points was divided into 5 equal parts and evaluated in the order of A, B, C, D and E from the upper group.
  • the stretching treatment in the width direction was performed by stretching the first optically anisotropic layer of Example 1 in Table 1 below at a stretching temperature of 120° C. to 150° C. and a stretching ratio of 2.0 times to 5.0 times. It was set so that a ⁇ /2 plate having the physical property values (Re1, Rth1) described in the column could be obtained. In this way, a long ⁇ /2 plate A was obtained. The film thickness of this ⁇ /2 plate A was 50 ⁇ m. The in-plane retardation and the thickness direction retardation of this ⁇ /2 plate A were measured by the above-described methods.
  • the measured Re1 (590) was 280 nm
  • Rth1 (590) was 168 nm
  • nx1 was 1.5339
  • ny1 was 1.5283
  • nz1 was 1.5278. From this result, the relationship between nx1, ny1 and nz1 was nx1>ny1>nz1, which satisfied the formula (1).
  • the stretching treatment in the width direction was performed by stretching the first optically anisotropic layer of Comparative Example 2 in Table 2 below at a stretching temperature of 120° C. to 150° C. and a stretching ratio of 2.0 times to 5.0 times. It was set so that a ⁇ /2 plate having the physical property values (Re1, Rth1) described in the column could be obtained. In this way, a long ⁇ /2 plate B was obtained. The film thickness of this ⁇ /2 plate B was 50 ⁇ m. The in-plane retardation and the thickness direction retardation of the ⁇ /2 plate B were measured by the above-described methods.
  • the measured Re1 (590) was 280 nm, Rth1 (590) was 190 nm, nx1 was 1.5341, ny1 was 1.5285, and nz1 was 1.5275. From this result, the relationship between nx1, ny1 and nz1 was nx1>ny1>nz1, which satisfied the formula (1).
  • the prepared styrene-maleic acid copolymer resin, acrylic resin and adhesive are co-extruded to form an acrylic resin layer, an adhesive layer, a styrene-maleic acid copolymer resin layer, an adhesive layer and an acrylic resin layer.
  • a long second resin film having layers in this order was obtained.
  • a long ⁇ /4 plate is obtained by subjecting the second resin film produced in (3-1-1) to a stretching treatment (bidirectional stretching treatment) in the width direction and the longitudinal direction of the second resin film.
  • a stretching treatment bidirectional stretching treatment
  • the conditions for the above-mentioned bidirectional stretching treatment are ⁇ /4 plates having physical properties (Re2, Rth2) described in the columns of the second optically anisotropic layer in Examples 1 to 4 and Comparative Example 3 in Table 1 below. I was set to be able to.
  • the stretching conditions in the width direction of the film are set such that the stretching temperature is 110° C. to 140° C. and the stretching ratio is 1.5 to 4.0.
  • the conditions for the stretching treatment in the longitudinal direction of the film were set at a stretching temperature of 110° C. to 140° C. and a stretching ratio of 1.5 to 4.0.
  • ⁇ /4 plates A to F were obtained.
  • the thickness of each of the obtained ⁇ /4 plates A to F was 40 ⁇ m.
  • the in-plane retardation and the retardation in the thickness direction of each of the obtained ⁇ /4 plates A to E were measured by the above method. No retardation was developed in the acrylic resin layer and the adhesive layer of each ⁇ /4 plate.
  • the measurement results of the ⁇ /4 plate A were Re2(590) of 147 nm, Rth2(590) of -132 nm, nx2 of 1.5582, ny2 of 1.5545, and nz2 of 1.5597.
  • the measurement results of the ⁇ /4 plate B were Re2(590) of 147 nm, Rth2(590) of -162 nm, nx2 of 1.5580, ny2 of 1.5543, and nz2 of 1.5602.
  • the measurement results of the ⁇ /4 plate C were Re2(590) of 147 nm, Rth2(590) of -191 nm, nx2 of 1.5577, ny2 of 1.5540, and nz2 of 1.5607.
  • the measurement results of the ⁇ /4 plate D were Re2(590) of 147 nm, Rth2(590) of ⁇ 220 nm, nx2 of 1.5575, ny2 of 1.5538, and nz2 of 1.5611.
  • the measurement results of the ⁇ /4 plate E were Re2(590) of 147 nm, Rth2(590) of -162 nm, nx2 of 1.5580, ny2 of 1.5543, and nz2 of 1.5602. From these results, in all of the ⁇ /4 plates A to E, the relationship of nx2, ny2, and nz2 was nz2>nx2>ny2, which satisfied the expression (2).
  • the in-plane retardation and the retardation in the thickness direction of the ⁇ /4 plate F were measured by the above method. No retardation was developed in the obtained ⁇ /4 plate acrylic resin layer and adhesive layer.
  • the measured Re2 (590) was 147 nm
  • Rth2 (590) was -88 nm
  • nx2 was 1.5586,
  • ny2 was 1.5549
  • nz2 was 1.5589. From this result, the relationship between nx2, ny2, and nz2 was nz2>nx2>ny2.
  • Example 1 A long polarizing film, a long .lamda./2 plate A and a long .lamda./4 plate A are respectively cut out to obtain a sheet of polarizing film, a sheet of .lamda./2 plate A and a sheet of .lamda./4 plate. I got A.
  • the sheet-shaped polarizing film, the sheet-shaped ⁇ /2 plate A and the sheet-shaped ⁇ /4 plate A are attached to each other using an adhesive (“CS9621” manufactured by Nitto Denko Corporation) to obtain a polarizing film and an adhesive layer.
  • a ⁇ /2 plate A (first optically anisotropic layer), an adhesive layer and a ⁇ /4 plate A (second optically anisotropic layer) were obtained in this order to obtain a circularly polarizing plate.
  • This circularly polarizing plate is a mode corresponding to the first embodiment (see FIG. 1).
  • the ⁇ /2 plate A is the first optically anisotropic layer and the ⁇ /4 plate A is the second optically anisotropic layer.
  • the above-mentioned bonding is such that when viewed from the polarizing film side, the angle ⁇ A1 formed by the slow axis of the ⁇ /2 plate A clockwise with respect to the transmission axis of the polarizing film is 45°, and the transmission axis of the polarizing film is Then, the angle ⁇ B1 formed by the slow axis of the ⁇ /4 plate A in the clockwise direction was set to 135°.
  • the obtained circularly polarizing plate was evaluated by the method described above. Re(450), Re(550) and Re(650) of the optically anisotropic layered product included in the circularly polarizing plate of this example satisfied the following formula (3).
  • Example 2 The same operation as in Example 1 was performed except that the long ⁇ /4 plate A was changed to the long ⁇ /4 plate B, and the polarizing film, the adhesive layer, the ⁇ /2 plate A, the adhesive layer and ⁇ / A circularly polarizing plate having 4 plates B in this order was obtained.
  • the ⁇ /2 plate A is the first optically anisotropic layer
  • the ⁇ /4 plate B is the second optically anisotropic layer.
  • the obtained circularly polarizing plate was evaluated by the above method.
  • Re(450), Re(550) and Re(650) of the optically anisotropic laminate contained in this circularly polarizing plate satisfied the above formula (3).
  • the first optically anisotropic layer satisfies the above formula (1)
  • the second optically anisotropic layer satisfies the above formula (2)
  • the sum of NZ1 and NZ2 is 0. It was 0.5.
  • Example 3 The same operation as in Example 1 was performed except that the long ⁇ /4 plate A was changed to the long ⁇ /4 plate C, and the polarizing film, the adhesive layer, the ⁇ /2 plate A, the adhesive layer and ⁇ / A circularly polarizing plate having 4 plates C in this order was obtained.
  • the ⁇ /2 plate A is the first optically anisotropic layer
  • the ⁇ /4 plate C is the second optically anisotropic layer.
  • the obtained circularly polarizing plate was evaluated by the above method.
  • Re(450), Re(550) and Re(650) of the optically anisotropic laminate contained in this circularly polarizing plate satisfied the above formula (3).
  • the first optically anisotropic layer satisfies the above formula (1)
  • the second optically anisotropic layer satisfies the above formula (2)
  • the sum of NZ1 and NZ2 is 0. It was .3.
  • Example 4 The same operation as in Example 1 was performed except that the long ⁇ /4 plate A was changed to the long ⁇ /4 plate D, and the polarizing film, the adhesive layer, the ⁇ /2 plate A, the adhesive layer and ⁇ / A circularly polarizing plate having 4 plates D in this order was obtained.
  • the ⁇ /2 plate A is the first optically anisotropic layer
  • the ⁇ /4 plate D is the second optically anisotropic layer.
  • the obtained circularly polarizing plate was evaluated by the above method. Re(450), Re(550) and Re(650) of the optically anisotropic laminate contained in this circularly polarizing plate satisfied the above formula (3).
  • the first optically anisotropic layer satisfies the above formula (1)
  • the second optically anisotropic layer satisfies the above formula (2)
  • the sum of NZ1 and NZ2 is 0. It was 1.
  • Example 1 The same operation as in Example 1 was performed except that the long ⁇ /4 plate A was changed to the long ⁇ /4 plate F, and the polarizing film, the adhesive layer, the ⁇ /2 plate A, the adhesive layer and ⁇ / A circularly polarizing plate having 4 plates F in this order was obtained.
  • the ⁇ /2 plate A is the first optically anisotropic layer
  • the ⁇ /4 plate F is the second optically anisotropic layer.
  • the obtained circularly polarizing plate was evaluated by the above method.
  • the Re(450), Re(550) and Re(650) of the optically anisotropic laminate contained in this circularly polarizing plate are Re(450) ⁇ Re(550) ⁇ Re(650) and are represented by the above formula ( 3) was satisfied.
  • the first optically anisotropic layer satisfies the above formula (1)
  • the second optically anisotropic layer satisfies the above formula (2)
  • the sum of NZ1 and NZ2 is 1.0. Met.
  • Example 2 The same operation as in Example 1 was performed except that the following points were changed to obtain a circularly polarizing plate having a polarizing film, an adhesive layer, a ⁇ /2 plate B, an adhesive layer and a ⁇ /4 plate F in this order. ..
  • the ⁇ /2 plate B is the first optically anisotropic layer
  • the ⁇ /4 plate F is the second optically anisotropic layer.
  • the obtained circularly polarizing plate was evaluated by the above method. Further, Re(450), Re(550) and Re(650) of the optically anisotropic laminate contained in this circularly polarizing plate are Re(450) ⁇ Re(550) ⁇ Re(650), It satisfied the formula (3).
  • the first optically anisotropic layer satisfies the above formula (1)
  • the second optically anisotropic layer satisfies the above formula (2)
  • the sum of NZ1 and NZ2 is 1.08.
  • Met. (change point) The long ⁇ /2 plate A was changed to the long ⁇ /2 plate B.
  • the long ⁇ /4 plate A was changed to the long ⁇ /4 plate F.
  • the layers are stuck together such that when viewed from the polarizing film side, the angle ⁇ A1 formed by the slow axis of the ⁇ /2 plate B in the clockwise direction with respect to the transmission axis of the polarizing film is 22.5°, and the transmission of the polarizing film.
  • the angle ⁇ B1 formed by the slow axis of the ⁇ /4 plate F clockwise with respect to the axis was set to 90°.
  • Example 3 The same operation as in Example 1 was performed except that the following points were changed to obtain a circularly polarizing plate including a polarizing film, an adhesive layer, a ⁇ /2 plate B, an adhesive layer and a ⁇ /4 plate E in this order. ..
  • the ⁇ /2 plate B is the first optically anisotropic layer
  • the ⁇ /4 plate E is the second optically anisotropic layer.
  • the obtained circularly polarizing plate was evaluated by the above method. Further, Re(450), Re(550) and Re(650) of the optically anisotropic laminate contained in this circularly polarizing plate are Re(450) ⁇ Re(550) ⁇ Re(650), It satisfied the formula (3).
  • the first optically anisotropic layer satisfies the above formula (1)
  • the second optically anisotropic layer satisfies the above formula (2)
  • the sum of NZ1 and NZ2 is 0. It was 0.58.
  • the long ⁇ /2 plate A was changed to the long ⁇ /2 plate B.
  • the long ⁇ /4 plate A was changed to the long ⁇ /4 plate E.
  • the layers are stuck together such that when viewed from the polarizing film side, the angle ⁇ A1 formed by the slow axis of the ⁇ /2 plate B in the clockwise direction with respect to the transmission axis of the polarizing film is 22.5°, and the transmission of the polarizing film.
  • the angle ⁇ B1 formed by the slow axis of the ⁇ /4 plate F clockwise with respect to the axis was set to 90°.
  • Comparative Example 4 The circularly polarizing plate of Comparative Example 4 was manufactured by the following method (the same method as Example 1 in JP 2010-266723 A).
  • C4-1) Production of Film C1 (a film containing a resin having a positive intrinsic birefringence value)
  • a first unstretched film made of a norbornene-based polymer (“ZEONOR1420” manufactured by Nippon Zeon Co., Ltd., glass transition temperature: 136° C.)
  • the roll-wound body was obtained by melt extrusion molding. Then, the roll-shaped body of the first unstretched film was stretched using a tenter stretching machine (see FIG.
  • the film was roll-formed into a roll C1 by obliquely stretching the film C1 in a direction of 45° with respect to the width direction.
  • the film C1 thus obtained had an Nz coefficient (NZ1) of 1.1, a Re1 (590) of 66 nm, an angle formed by the slow axis with respect to the width direction of 44.8°, and a thickness of 120 ⁇ m. It was
  • the unstretched laminate was pulled out from this roll-shaped body and stretched at a stretching temperature of 138° C., a stretching ratio of 1.7 times, and a stretching speed of 8 mm/min using the same tenter stretching machine as in (C4-1).
  • a roll wound body of the film C2 was obtained.
  • the obtained film C2 has an Nz coefficient (NZ2) of ⁇ 0.1, a Re2 (590) of 66 nm, an angle formed by the slow axis with respect to the width direction of ⁇ 45.2°, and a thickness of 130 ⁇ m. Met.
  • (C4-4) Production of Circularly Polarizing Plate The optically anisotropic laminate C3 obtained in (C4-3) and a polarizing film (manufactured by Sanritz Co., HLC2-5618S, thickness 180 ⁇ m) were combined with each other by a laminating device (special (See FIG. 4 of Kai 2010-266723) was laminated by a roll-to-roll method to produce a circularly polarizing film, which was cut into a predetermined size to obtain a circularly polarizing plate.
  • a laminating device special (See FIG. 4 of Kai 2010-266723) was laminated by a roll-to-roll method to produce a circularly polarizing film, which was cut into a predetermined size to obtain a circularly polarizing plate.
  • the obtained circularly polarizing plate was evaluated by the above-described evaluation method in the same manner as in Example 1.
  • the relationship of Re(450), Re(550) and Re(650) of the optically anisotropic laminate contained in the circularly polarizing plate of this example is Re(450)>Re(550)>Re(650). Yes, the formula (3) was not satisfied.
  • the first optically anisotropic layer satisfies the following formula (1)
  • the second optically anisotropic layer satisfies the following formula (2)
  • the sum of NZ1 and NZ2 is 1. It was 0.0.
  • Rth1 Phase difference in the thickness direction of the ⁇ /2 plate (first optically anisotropic layer) at a measurement wavelength of 590 nm.
  • ⁇ A1 An angle formed by the slow axis of the ⁇ /2 plate (first optically anisotropic layer) in the clockwise direction with respect to the transmission axis of the polarizing film when viewed from the polarizing film side.
  • NZ1 NZ coefficient of ⁇ /2 plate (first optical anisotropic layer).
  • Re2 In-plane retardation of a ⁇ /4 plate (second optically anisotropic layer) at a measurement wavelength of 590 nm.
  • Re2 (550) In-plane retardation of a ⁇ /4 plate (second optically anisotropic layer) at a measurement wavelength of 550 nm.
  • Re2 (450) In-plane retardation of a ⁇ /4 plate (second optically anisotropic layer) at a measurement wavelength of 4590 nm.
  • Rth2 (590) Phase difference in the thickness direction of the ⁇ /4 plate (second optically anisotropic layer) at a measurement wavelength of 590 nm.
  • ⁇ B1 An angle formed by the slow axis of the ⁇ /4 plate (second optically anisotropic layer) in the clockwise direction with respect to the transmission axis of the polarizing film as viewed from the polarizing film side.
  • NZ2 NZ coefficient of ⁇ /4 plate (second optically anisotropic layer).
  • Angle formed by the slow axis An angle formed by the slow axis of the first optically anisotropic layer and the slow axis of the second optically anisotropic layer.
  • the image display devices including the optically anisotropic laminates of Examples 1 to 4 were compared with the image display devices including the optically anisotropic laminates of Comparative Examples 1 to 4, It can be seen that the coloring of the display surface when viewed from the front direction is suppressed equally, and the coloring of the display surface when viewed from the tilt direction is suppressed. From the above results, according to Examples 1 to 4 including the optically anisotropic laminate of the present invention, it is possible to realize the image display device in which the coloring of the display surface when viewed from the front direction and the tilt direction is suppressed.
  • the angle ⁇ A1 formed by the slow axis of the ⁇ /2 plate (first optically anisotropic layer) in the clockwise direction with respect to the transmission axis of the linear polarizer (polarizing film) was Although an optically anisotropic laminate of 45° is shown, the present invention is not limited to this. It may be an optically anisotropic laminate having an angle of 45° between the absorption axis of the linear polarizer and the slow axis of the first optically anisotropic layer.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Optics & Photonics (AREA)
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  • Electroluminescent Light Sources (AREA)
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Abstract

Stratifié optiquement anisotrope comprenant une première couche optiquement anisotrope et une seconde couche optiquement anisotrope, la première couche optiquement anisotrope satisfaisant l'expression suivante (1), la seconde couche optiquement anisotrope satisfaisant l'expression suivante (2), le stratifié optiquement anisotrope satisfaisant l'expression suivante (3), un facteur NZ NZ1 de la première couche optiquement anisotrope et un facteur NZ NZ2 de la seconde couche optiquement anisotrope satisfaisant l'expression suivante (4) et l'angle formé par l'axe lent de la première couche optiquement anisotrope et l'axe lent de la seconde couche optiquement anisotrope sont de 90°. nx1 > ny1 ≥ nz1 expression (1), nz2 > nx2 > ny2 expression (2), Re(450) < Re(550) < Re(650) expression (3), -0,3 ≤ NZ1 + NZ2 ≤ 0,8 expression (4)
PCT/JP2019/047519 2018-12-27 2019-12-04 Stratifié optiquement anisotrope, procédé de production de celui-ci, plaque de polarisation circulaire et dispositif d'affichage d'image WO2020137409A1 (fr)

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CN201980083873.4A CN113196876A (zh) 2018-12-27 2019-12-04 光学各向异性层叠体及其制造方法、圆偏振片以及图像显示装置
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KR20230121748A (ko) 2020-12-28 2023-08-21 니폰 제온 가부시키가이샤 복굴절 필름, 그 제조 방법, 및 광학 필름의 제조 방법
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KR20220011530A (ko) * 2020-07-21 2022-01-28 삼성에스디아이 주식회사 편광판 및 이를 포함하는 광학표시장치
KR102657802B1 (ko) 2020-07-21 2024-04-15 삼성에스디아이 주식회사 편광판 및 이를 포함하는 광학표시장치
JP7439711B2 (ja) 2020-09-23 2024-02-28 日本ゼオン株式会社 長尺の広帯域波長フィルムの製造方法及び長尺の円偏光フィルムの製造方法
KR20230121743A (ko) 2020-12-28 2023-08-21 니폰 제온 가부시키가이샤 광학 필름 및 그 제조 방법, 그리고 편광판
KR20230121748A (ko) 2020-12-28 2023-08-21 니폰 제온 가부시키가이샤 복굴절 필름, 그 제조 방법, 및 광학 필름의 제조 방법
KR20230122006A (ko) 2020-12-28 2023-08-22 니폰 제온 가부시키가이샤 다층 필름 및 그 제조 방법
KR20230124554A (ko) 2020-12-28 2023-08-25 니폰 제온 가부시키가이샤 다층 필름, 광학 필름 및 제조 방법
WO2022163416A1 (fr) * 2021-01-29 2022-08-04 日本ゼオン株式会社 Film optique, son procédé de production et film polarisant

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TWI826618B (zh) 2023-12-21
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