WO2023042518A1 - 光学積層体 - Google Patents

光学積層体 Download PDF

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WO2023042518A1
WO2023042518A1 PCT/JP2022/025644 JP2022025644W WO2023042518A1 WO 2023042518 A1 WO2023042518 A1 WO 2023042518A1 JP 2022025644 W JP2022025644 W JP 2022025644W WO 2023042518 A1 WO2023042518 A1 WO 2023042518A1
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group
layer
thickness
polarizer
meth
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PCT/JP2022/025644
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English (en)
French (fr)
Japanese (ja)
Inventor
政俊 朝永
大輔 林
周作 後藤
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日東電工株式会社
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • 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

Definitions

  • the present invention relates to an optical laminate.
  • An image display device typically uses an optical laminate including a polarizing plate and a retardation layer.
  • an alignment fixed layer of a liquid crystal compound may be used as the retardation layer.
  • a polarizing plate with a retardation layer is known, which is obtained by laminating an alignment solidified layer of a liquid crystal compound to a polarizing plate via an ultraviolet curable adhesive (for example, Patent Document 1). .
  • Patent Document 1 an ultraviolet curable adhesive
  • the present invention has been made to solve the conventional problems described above, and its main purpose is to provide an optical layered body capable of suppressing a change in reflection hue depending on the usage environment.
  • An optical laminate comprises a polarizing plate containing a polarizer, and a retardation layer bonded to the opposite side of the polarizing plate from a viewing side via an adhesive layer, wherein the retardation layer is an alignment fixed layer of a liquid crystal compound, and the shear storage elastic modulus G' of the pressure-sensitive adhesive layer at 23°C is 0.2 MPa or less.
  • the adhesive layer has a thickness of 5 ⁇ m or more.
  • the thickness of the retardation layer is less than the thickness of the polarizer.
  • the shear storage modulus G' of the pressure-sensitive adhesive layer at 23°C is 0.1 MPa or less.
  • the thickness of the polarizer is 8 ⁇ m or less.
  • the retardation layer exhibits reverse dispersion wavelength characteristics and functions as a ⁇ /4 plate, and the angle formed by the slow axis of the retardation layer and the absorption axis of the polarizer is , 42° to 48°.
  • FIG. 1 is a schematic cross-sectional view of an optical stack according to one embodiment of the invention.
  • refractive index (nx, ny, nz) is the refractive index in the direction in which the in-plane refractive index is maximum (i.e., slow axis direction), and "ny” is the in-plane direction orthogonal to the slow axis (i.e., fast axis direction) and "nz” is the refractive index in the thickness direction.
  • In-plane retardation (Re) “Re( ⁇ )” is the in-plane retardation of the film measured at 23° C. with light of wavelength ⁇ nm.
  • Re(450) is the in-plane retardation of a film measured with light having a wavelength of 450 nm at 23°C.
  • Thickness direction retardation (Rth) is the retardation in the thickness direction of the film measured at 23° C. with light having a wavelength of ⁇ nm.
  • Rth(450) is the retardation in the thickness direction of the film measured at 23°C with light having a wavelength of 450 nm.
  • FIG. 1 is a schematic cross-sectional view of an optical layered body according to one embodiment of the present invention.
  • the optical layered body 1 of the illustrated example includes a polarizing plate 2 including a polarizer 21 and a retardation layer 3 attached to the opposite side of the polarizing plate 2 from the viewing side with an adhesive layer 4 interposed therebetween.
  • the optical layered body 1 includes the polarizing plate 2 , the adhesive layer 4 , and the retardation layer 3 in this order from the viewing side of the optical layered body 1 .
  • the retardation layer 3 is an alignment fixed layer of a liquid crystal compound.
  • the term "fixed alignment layer” refers to a layer in which a liquid crystal compound is aligned in a predetermined direction and the alignment state is fixed.
  • the "alignment fixed layer” is a concept including an alignment cured layer obtained by curing a liquid crystal monomer.
  • the shear storage modulus G′ of the adhesive layer 4 at 23° C. is 0.20 MPa or less, preferably 0.15 MPa or less, more preferably 0.10 MPa or less, typically 0.01 MPa or more, preferably is 0.05 MPa or more.
  • the shear storage modulus G' of the pressure-sensitive adhesive layer can be measured in accordance with the method described in Examples below.
  • the retardation layer is an alignment fixed layer of a liquid crystal compound
  • the difference between nx and ny of the retardation layer can be significantly increased compared to a non-liquid crystal material.
  • the thickness of the retardation layer can be significantly reduced. As a result, the thickness of the optical layered body (and consequently the image display device) can be reduced.
  • the dimensional change of the polarizing plate occurs due to the use environment of the optical layered body. In some cases, the reflection hue change of the optical layered body becomes large.
  • the shear storage elastic modulus G′ of the pressure-sensitive adhesive layer positioned between the polarizing plate and the retardation layer is equal to or less than the above upper limit, the dimensional change of the polarizing plate does not occur. Affecting the retardation layer can be reduced, and a change in reflection hue of the optical layered body can be suppressed.
  • the optical laminate 1 includes an adhesive layer 5 located on the side opposite to the viewing side of the retardation layer 3 .
  • the adhesive layer 4 located between the polarizing plate 2 and the retardation layer 3 is referred to as the first adhesive layer 4, and the retardation layer 3 is placed on the opposite side of the first adhesive layer 4.
  • the located adhesive layer 5 is distinguished as the second adhesive layer 5 .
  • the optical laminate 1 can be attached to an image display panel with the second adhesive layer 5 .
  • a release film (not shown) is preferably temporarily attached to the surface of the second pressure-sensitive adhesive layer 5 opposite to the retardation layer 3 until the optical layered body 1 is used. Temporarily attaching the release film protects the second pressure-sensitive adhesive layer and enables roll formation of the optical layered body.
  • the polarizing plate 2 includes a polarizer 21, a first protective layer 22 disposed on the viewing side of the polarizer 21, and a layer disposed on the side opposite to the viewing side of the polarizer 21. and a second protective layer 23 .
  • Each of the first protective layer 22 and the second protective layer 23 is typically attached to the polarizer 21 via any suitable adhesive layer (adhesive layer, adhesive layer: not shown). ing.
  • a second protective layer 23 is positioned between the polarizer 21 and the first adhesive layer 4 and pressure-sensitively adhered to the first adhesive layer 4 .
  • the polarizing plate 2 does not have to include the second protective layer 23 . In this case, the polarizer 21 is pressure-sensitively adhered to the first adhesive layer 4 .
  • the thickness of the polarizer 21 is typically 1 ⁇ m or more, preferably 3 ⁇ m or more, typically 15 ⁇ m or less, preferably 12 ⁇ m or less, more preferably 10 ⁇ m or less, and particularly preferably 8 ⁇ m or less. If the thickness of the polarizer is equal to or less than the above upper limit, it is possible to suppress the dimensional change of the polarizing plate according to the usage environment while reducing the thickness of the optical layered body, and it is possible to stably suppress the reflection hue change of the optical layered body. .
  • the thickness of the first adhesive layer 4 is typically 2 ⁇ m or more, preferably 5 ⁇ m or more, more preferably 8 ⁇ m or more, still more preferably 10 ⁇ m or more, and typically 20 ⁇ m or less, preferably 15 ⁇ m or less. .
  • the thickness of the first pressure-sensitive adhesive layer 4 may be less than the thickness of the polarizer 21 or may be greater than or equal to the thickness of the polarizer 21 .
  • the thickness of the first adhesive layer 4 with respect to the thickness of the polarizer 21 (thickness of the first adhesive layer 4/thickness of the polarizer 21) is typically 0.3 or more, preferably 0.4 or more, It is more preferably 0.8 or more, typically 2.0 or less, preferably 1.5 or less.
  • the thickness of the first pressure-sensitive adhesive layer is at least the above lower limit, it is possible to stably suppress the influence of the dimensional change of the polarizing plate on the retardation layer. If the thickness of the first pressure-sensitive adhesive layer is equal to or less than the above upper limit, the thickness of the optical layered body can be reduced.
  • the retardation layer 3 can typically function as a ⁇ /4 plate.
  • the thickness of the retardation layer 3 can be set so as to have an appropriate function as a ⁇ /4 plate.
  • the thickness of the retardation layer 3 may be less than the thickness of the polarizer 21 or may be greater than or equal to the thickness of the polarizer 21 .
  • the thickness of the retardation layer 3 is preferably less than the thickness of the polarizer 21 . If the thickness of the retardation layer 3 is less than the thickness of the polarizer 21, the thickness of the optical laminate can be further reduced.
  • the thickness of the retardation layer 3 is typically 1 ⁇ m to 5 ⁇ m, preferably 3 ⁇ m or less.
  • the thickness of the retardation layer 3 with respect to the thickness of the polarizer 21 is typically 0.1 or more, preferably 0.2 or more, and is typically It is 1.5 or less, preferably less than 1.0, more preferably 0.8 or less.
  • Polarizing plate B-1 Polarizer Any appropriate polarizer can be employed as the polarizer 21 .
  • the resin film forming the polarizing plate 2 may be a single-layer resin film or a laminate of two or more layers.
  • a resin film forming the polarizer 21 contains a dichroic substance.
  • Dichroic substances include, for example, iodine and organic dyes. Dichroic substances can be used alone or in combination. Among the dichroic substances, iodine is preferred.
  • a specific example of a polarizer composed of a single-layer resin film is a PVA-based resin film that has been dyed with iodine and stretched (typically, uniaxially stretched).
  • the dyeing with iodine is performed by, for example, immersing the PVA-based film in an aqueous iodine solution.
  • the draw ratio of the uniaxial drawing is preferably 3 to 7 times. Stretching may be performed after the dyeing treatment, or may be performed while dyeing. Moreover, you may dye after extending
  • the polarizer obtained using a laminate include a laminate of a resin substrate and a PVA-based resin layer (PVA-based resin film) laminated on the resin substrate, or a resin substrate and the resin
  • a polarizer obtained by using a laminate with a PVA-based resin layer formed by coating on a substrate can be mentioned.
  • a polarizer obtained by using a laminate of a resin base material and a PVA-based resin layer formed by coating on the resin base material is obtained, for example, by applying a PVA-based resin solution to the resin base material and drying the resin base material.
  • a PVA-based resin layer thereon to obtain a laminate of a resin substrate and a PVA-based resin layer; stretching and dyeing the laminate to use the PVA-based resin layer as a polarizer; obtain.
  • a polyvinyl alcohol-based resin layer containing a halide and a polyvinyl alcohol-based resin is formed on one side of the resin substrate.
  • Stretching typically includes immersing the laminate in an aqueous boric acid solution for stretching.
  • stretching may further include stretching the laminate in air at a high temperature (eg, 95° C. or higher) before stretching in an aqueous boric acid solution, if necessary.
  • the laminate is preferably subjected to drying shrinkage treatment to shrink the laminate by 2% or more in the width direction by heating while conveying in the longitudinal direction.
  • the manufacturing method of the present embodiment includes subjecting the laminate to an in-air auxiliary stretching treatment, a dyeing treatment, an underwater stretching treatment, and a drying shrinkage treatment in this order.
  • auxiliary stretching it is possible to improve the crystallinity of PVA and achieve high optical properties even when PVA is coated on a thermoplastic resin.
  • by increasing the orientation of PVA in advance it is possible to prevent problems such as deterioration of orientation and dissolution of PVA when immersed in water in the subsequent dyeing process or stretching process, resulting in high optical properties.
  • the PVA-based resin layer when the PVA-based resin layer is immersed in a liquid, disturbance of the orientation of the polyvinyl alcohol molecules and deterioration of the orientation can be suppressed as compared with the case where the PVA-based resin layer does not contain a halide.
  • This can improve the optical properties of the polarizer obtained through treatment steps such as dyeing treatment and underwater stretching treatment in which the laminate is immersed in a liquid.
  • the optical properties can be improved by shrinking the laminate in the width direction by drying shrinkage treatment.
  • the obtained resin substrate/polarizer laminate may be used as it is (that is, the resin substrate may be used as a protective layer for the polarizer), or the resin substrate may be peeled off from the resin substrate/polarizer laminate.
  • any appropriate protective layer may be laminated on the release surface according to the purpose. Details of the method for manufacturing such a polarizer are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580 and Japanese Patent No. 6470455. These publications are incorporated herein by reference in their entirety.
  • the polarizer 21 is preferably composed of a laminate of two or more layers, and more preferably composed of a laminate of a resin base material and a PVA-based resin layer formed by coating on the resin base material.
  • the polarizer 21 preferably exhibits absorption dichroism at any wavelength of 380 nm to 780 nm.
  • the single transmittance of the polarizer 21 is, for example, 41.5% to 46.0%, preferably 43.0% to 46.0%, more preferably 44.5% to 46.0%. .
  • the degree of polarization of the polarizer 21 is preferably 97.0% or higher, more preferably 99.0% or higher, still more preferably 99.9% or higher.
  • first protective layer 22 and second protective layer 23 are formed of any suitable film that can be used as a protective layer of polarizer 21 .
  • the material that is the main component of the film include cellulose-based resins such as triacetyl cellulose (TAC), polyester-based, polyvinyl alcohol-based, polycarbonate-based, polyamide-based, polyimide-based, polyethersulfone-based, and polysulfone-based resins. , polystyrene-based, polynorbornene-based cycloolefin-based resins, polyolefin-based, (meth)acrylic-based, and acetate-based transparent resins.
  • TAC triacetyl cellulose
  • Thermosetting resins such as (meth)acrylic, urethane, (meth)acrylic urethane, epoxy, and silicone, or ultraviolet curable resins may also be used.
  • (meth)acrylic resin refers to acrylic resin and/or methacrylic resin.
  • a glassy polymer such as a siloxane-based polymer can also be used.
  • polymer films described in JP-A-2001-343529 (WO01/37007) can also be used.
  • Materials for this film include, for example, a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in a side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and nitrile group in a side chain.
  • a resin composition comprising an alternating copolymer of isobutene and N-methylmaleimide and an acrylonitrile-styrene copolymer.
  • the polymer film can be, for example, an extrudate of the resin composition.
  • the first protective layer 22 and the second protective layer 23 may contain a (meth)acrylic resin.
  • a (meth)acrylic resin having a glutarimide structure is used as the (meth)acrylic resin.
  • (Meth)acrylic resins having a glutarimide structure for example, JP-A-2006-309033, JP-A-2006-317560, JP-A-2006-328329, JP-A-2006-328334, JP-A-2006 -337491, JP 2006-337492, JP 2006-337493, JP 2006-337569, JP 2007-009182, JP 2009-161744, JP 2010-284840 It is described in the publication. These descriptions are incorporated herein by reference.
  • the first protective layer 22 preferably contains a cycloolefin-based resin, more preferably a polynorbornene-based resin.
  • the second protective layer 23 preferably contains a cellulose-based resin, more preferably a triacetylcellulose-based resin.
  • each of the first protective layer 22 and the second protective layer 23 is typically 300 ⁇ m or less, preferably 100 ⁇ m or less, more preferably 5 ⁇ m to 80 ⁇ m, still more preferably 10 ⁇ m to 60 ⁇ m.
  • each thickness of the 1st protective layer 22 and the 2nd protective layer 23 is thickness including the thickness of a surface treatment layer.
  • the retardation layer 3 is provided to impart antireflection properties to an image display device (typically an organic EL display device).
  • the retardation layer 3 is located on the side opposite to the polarizing plate 2 with respect to the first adhesive layer 4 .
  • the retardation layer 3 is pressure-sensitively adhered to the first adhesive layer 4 .
  • the in-plane retardation Re(550) of the retardation layer 3 is preferably 100 nm to 190 nm, more preferably 110 nm to 170 nm, still more preferably 120 nm to 160 nm.
  • the Nz coefficient of the retardation layer 3 is preferably 0.9 to 1.5, more preferably 0.9 to 1.3. By satisfying such a relationship, it is possible to obtain an image display device having a very excellent reflective hue.
  • the retardation layer 3 exhibits reverse dispersion wavelength characteristics in which the retardation value increases according to the wavelength of the measurement light.
  • Re(450)/Re(550) of the retardation layer 3 is preferably 0.8 or more and less than 1, more preferably 0.8 or more and 0.95 or less. With such a configuration, very excellent antireflection properties can be achieved.
  • the angle formed by the slow axis of the retardation layer 3 and the absorption axis of the polarizer 21 is preferably 40° to 50°, more preferably 42° to 48°, still more preferably about 45°. . If the angle is within such a range, an image display device having extremely excellent antireflection properties can be obtained by using a ⁇ /4 plate as the retardation layer as described above.
  • the retardation layer 3 is an alignment and solidification layer of a liquid crystal compound, as described above.
  • the retardation layer 3 contains a rod-shaped liquid crystal compound.
  • the rod-shaped liquid crystal compounds are aligned in the slow axis direction of the retardation layer 3 (homogeneous alignment).
  • Rod-shaped liquid crystal compounds include, for example, liquid crystal polymers and liquid crystal monomers.
  • the liquid crystal compound is preferably polymerizable. When the liquid crystal compound is polymerizable, the alignment state of the liquid crystal compound can be fixed by polymerizing after aligning the liquid crystal compound.
  • the retardation layer 3 which is an alignment fixed layer of a liquid crystal compound, can be formed using a composition containing a polymerizable liquid crystal compound (polymerizable liquid crystal compound).
  • the polymerizable liquid crystal compound contained in the composition as used herein refers to a compound having a polymerizable group and liquid crystallinity.
  • a polymerizable group means a group involved in a polymerization reaction, preferably a photopolymerizable group.
  • the photopolymerizable group refers to a group that can participate in a polymerization reaction by an active radical generated from a photopolymerization initiator, an acid, or the like.
  • liquid crystallinity may be thermotropic or lyotropic.
  • the structure of the liquid crystal phase may be nematic liquid crystal or smectic liquid crystal. Thermotropic nematic liquid crystals are preferred from the standpoint of ease of production.
  • the retardation layer 3 is formed using a composition containing a liquid crystal compound represented by the following formula (1).
  • L 1 and L 2 each independently represent a monovalent organic group, and at least one of L 1 and L 2 represents a polymerizable group.
  • Monovalent organic groups include any suitable groups.
  • the polymerizable group represented by at least one of L 1 and L 2 includes a radically polymerizable group (group capable of radical polymerization). Any appropriate radically polymerizable group can be used as the radically polymerizable group.
  • An acryloyl group or a methacryloyl group is preferred.
  • An acryloyl group is preferred because it has a high polymerization rate and improves productivity.
  • a methacryloyl group can also be used as a polymerizable group for highly birefringent liquid crystals.
  • SP 1 and SP 2 each independently constitute a single bond, a linear or branched alkylene group, or a linear or branched alkylene group having 1 to 14 carbon atoms —CH 2 represents a divalent linking group in which one or more of - are substituted with -O-;
  • the linear or branched alkylene group having 1 to 14 carbon atoms preferably includes methylene group, ethylene group, propylene group, butylene group, pentylene group and hexylene group.
  • a 1 and A 2 each independently represent an alicyclic hydrocarbon group or an aromatic ring substituent.
  • a 1 and A 2 are preferably aromatic ring substituents having 6 or more carbon atoms or cycloalkylene rings having 6 or more carbon atoms.
  • D 1 , D 2 , D 3 and D 4 each independently represent a single bond or a divalent linking group.
  • D 3 is preferably -O-CO-, and D 3 and D 4 are more preferably -O-CO-.
  • D 1 and D 2 are preferably single bonds.
  • R 1 , R 2 , R 3 and R 4 each independently represent a hydrogen atom, a fluorine atom, or an alkyl group having 1 to 4 carbon atoms.
  • G 1 and G 2 each independently represent a single bond or an alicyclic hydrocarbon group.
  • G 1 and G 2 may represent an unsubstituted or substituted divalent alicyclic hydrocarbon group having 5 to 8 carbon atoms.
  • one or more —CH 2 — constituting the alicyclic hydrocarbon group may be substituted with —O—, —S— or —NH—.
  • G 1 and G 2 preferably represent a single bond.
  • Ar represents an aromatic hydrocarbon ring or an aromatic heterocycle.
  • Ar represents, for example, an aromatic ring selected from the group consisting of groups represented by the following formulas (Ar-1) to (Ar-6).
  • *1 represents the bonding position with D1
  • *2 represents the bonding position with D2 .
  • Q 1 represents N or CH
  • Q 2 represents -S-, -O-, or -N(R 5 )-.
  • R 5 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
  • Y 1 represents an unsubstituted or substituted aromatic hydrocarbon group having 6 to 12 carbon atoms or an aromatic heterocyclic group having 3 to 12 carbon atoms.
  • Z 1 , Z 2 and Z 3 each independently represents a hydrogen atom, a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms, and 3 carbon atoms. represents a monovalent alicyclic hydrocarbon group of up to 20, a monovalent aromatic hydrocarbon group of 6 to 20 carbon atoms, a halogen atom, a cyano group, a nitro group, -NR 6 R 7 or -SR 8 .
  • R 6 to R 8 each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and Z 1 and Z 2 may combine with each other to form a ring.
  • the ring may be an alicyclic, heterocyclic or aromatic ring, preferably an aromatic ring.
  • the formed ring may be substituted with a substituent.
  • a 3 and A 4 are each independently a group consisting of -O-, -N(R 9 )-, -S- and -CO- represents a group selected from the above, and R 9 represents a hydrogen atom or a substituent.
  • R 9 represents a hydrogen atom or a substituent. Examples of the substituent represented by R 9 include the same substituents that Y 1 in the above formula (Ar-1) may have.
  • X represents a hydrogen atom or an unsubstituted or substituted group 14-16 nonmetallic atom.
  • group 14 to group 16 nonmetallic atoms represented by X include an oxygen atom, a sulfur atom, an unsubstituted or substituted nitrogen atom, and an unsubstituted or substituted carbon atom.
  • substituent include the same substituents that Y 1 in the above formula (Ar-1) may have.
  • R 1 , R 2 , R 3 and R 4 are as described above.
  • SP 3 and SP 4 are each independently a single bond, a linear or branched alkylene group having 1 to 12 carbon atoms, or a linear chain having 1 to 12 carbon atoms. divalent in which one or more —CH 2 — constituting a straight or branched alkylene group is substituted with —O—, —S—, —NH—, —N(Q)—, or —CO— and Q represents a polymerizable group.
  • L 3 and L 4 each independently represent a monovalent organic group, and at least one of L 3 and L 4 and L 1 and L 2 in formula (1) above is represents a polymerizable group.
  • Ax is an organic group having 2 to 30 carbon atoms and having at least one aromatic ring selected from the group consisting of aromatic hydrocarbon rings and aromatic heterocyclic rings. represents In formulas (Ar-4) to (Ar-6), Ax preferably has an aromatic heterocyclic ring, more preferably a benzothiazole ring.
  • Ay is a hydrogen atom, an unsubstituted or optionally substituted alkyl group having 1 to 6 carbon atoms, or an aromatic hydrocarbon ring and aromatic represents an organic group having 2 to 30 carbon atoms and having at least one aromatic ring selected from the group consisting of heterocyclic rings. In formulas (Ar-4) to (Ar-6), Ay preferably represents a hydrogen atom.
  • Q 3 represents a hydrogen atom or an unsubstituted or optionally substituted alkyl group having 1 to 6 carbon atoms. In formulas (Ar-4) to (Ar-6), Q3 preferably represents a hydrogen atom.
  • Ar a group (atomic group) represented by the above formula (Ar-4) or the above formula (Ar-6) is preferable.
  • liquid crystal polymer and liquid crystal monomer may be used alone or in combination.
  • Specific examples of liquid crystal compounds are described, for example, in JP-A-2006-163343, JP-A-2006-178389, and International Publication No. 2018/123551. The descriptions of these publications are incorporated herein by reference.
  • the retardation layer 3 can be formed, for example, by the following procedure.
  • a coating liquid for forming an alignment film is applied onto an arbitrary suitable substrate and dried to form a coating film.
  • the coating film is subjected to rubbing treatment to form an alignment film on the substrate.
  • Typical alignment treatments include rubbing treatments and photo-alignment treatments.
  • the alignment film generally contains a polymer material as a main component. Representative examples of polymeric materials include polyvinyl alcohol, polyimide, and derivatives thereof.
  • the alignment film is coated with a solution containing a polymerizable liquid crystal compound and heated. Heating removes the solvent and advances the orientation of the liquid crystal compound. At this time, the heating may be performed in one stage, or in multiple stages by changing the temperature.
  • the polymerizable liquid crystal compound is polymerized by ultraviolet irradiation, and the orientation of the liquid crystal compound is fixed.
  • the retardation layer 3 made of the oriented solidified layer of the liquid crystal compound is formed on the substrate (substantially on the orientation film).
  • the retardation layer 3 is transferred via the first adhesive layer 4 so that the angle formed by the absorption axis of the polarizer 21 and the slow axis of the retardation layer 3 is within the above range.
  • Methods for aligning rod-like liquid crystal compounds are described in, for example, JP-A-2006-163343 and JP-A-2006-178389. The descriptions of these publications are incorporated herein by reference.
  • the first adhesive layer 4 is formed from an adhesive (pressure-sensitive adhesive).
  • the first pressure-sensitive adhesive layer 4 is formed, for example, by coating a pressure-sensitive adhesive on the second protective layer of the polarizing plate so as to have the thickness described above.
  • the adhesive typically contains a (meth)acrylic polymer, urethane polymer, silicone polymer or rubber polymer as a base polymer.
  • a (meth)acrylic polymer is used as the base polymer
  • the adhesive layer is formed from, for example, an adhesive containing the (meth)acrylic polymer.
  • (Meth)acrylic polymer contains a polymer of monomer components (raw material monomers) having alkyl (meth)acrylate as a main component.
  • the (meth)acrylic polymer contains structural units derived from alkyl (meth)acrylates.
  • Alkyl (meth)acrylate is preferably 50% by weight or more in all monomer components that are raw materials of the (meth)acrylic polymer, and can be arbitrarily set as the balance of monomers other than the alkyl (meth)acrylate.
  • (Meth)acrylate refers to acrylate and/or methacrylate.
  • alkyl (meth)acrylates constituting the main skeleton of the (meth)acrylic polymer include straight-chain or branched-chain alkyl groups having 1 to 18 carbon atoms.
  • alkyl groups include methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, amyl group, hexyl group, cyclohexyl group, heptyl group, 2-ethylhexyl group, isooctyl group, nonyl group and decyl group.
  • Alkyl (meth)acrylates can be used alone or in combination.
  • the average carbon number of the alkyl group is preferably 3-10.
  • the (meth)acrylic polymer may contain a structural unit derived from a copolymerizable monomer capable of polymerizing with the alkyl (meth)acrylate, in addition to the structural unit derived from the alkyl (meth)acrylate. That is, the monomer component that is the raw material of the (meth)acrylic polymer can further contain a copolymerizable monomer in addition to the alkyl (meth)acrylate.
  • copolymerizable monomers examples include carboxyl group-containing monomers, hydroxyl group-containing monomers, amino group-containing monomers, amide group-containing monomers, cyclization polymerizable monomers, epoxy group-containing monomers, sulfonic acid group-containing monomers, phosphoric acid group-containing monomers, Polyfunctional acrylates, (meth)acrylic acid esters having an alicyclic hydrocarbon group, (meth)acrylic acid esters having an aromatic hydrocarbon group, vinyl esters, aromatic vinyl compounds, dienes, vinyl ethers, vinyl chloride etc. Comonomers can be used alone or in combination.
  • reactive group-containing monomers containing a reactive group capable of reacting with the cross-linking agent described later, and more preferred are carboxyl group-containing monomers and hydroxyl group-containing monomers. mentioned.
  • the reactive group-containing monomer becomes a reaction point with the cross-linking agent when the pressure-sensitive adhesive contains the cross-linking agent described below.
  • Carboxyl group-containing monomers and hydroxyl group-containing monomers are highly reactive with intermolecular cross-linking agents, and are therefore preferably used to improve cohesiveness and heat resistance of the pressure-sensitive adhesive layer to be obtained.
  • a carboxyl group-containing monomer is preferable in terms of achieving both durability and reworkability, and a hydroxyl group-containing monomer is preferable in terms of improving reworkability.
  • the copolymerizable monomers can be used singly or in combination as raw material monomers for the (meth)acrylic polymer.
  • a carboxyl group-containing monomer is a compound that contains a carboxyl group in its structure and a polymerizable unsaturated double bond such as a (meth)acryloyl group or vinyl group.
  • carboxyl group-containing monomers include (meth)acrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid, and crotonic acid. Among these, acrylic acid is preferred.
  • the (meth)acrylic polymer may preferably contain a structural unit derived from a carboxyl group-containing monomer, more preferably a structural unit derived from (meth)acrylic acid. When the (meth)acrylic polymer contains a structural unit derived from a carboxyl group-containing monomer, the adhesive properties of the adhesive layer can be improved.
  • the content of the carboxyl group-containing monomer is usually 0.01% by weight or more and 10% by weight or less in all monomer components that are raw materials for the (meth)acrylic polymer.
  • a hydroxyl group-containing monomer is a compound that contains a hydroxyl group in its structure and a polymerizable unsaturated double bond such as a (meth)acryloyl group or vinyl group.
  • hydroxyl group-containing monomers include 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl ( hydroxyalkyl (meth)acrylates such as meth)acrylate, 10-hydroxydecyl (meth)acrylate, 12-hydroxylauryl (meth)acrylate; (4-hydroxymethylcyclohexyl)-methyl acrylate and the like.
  • the (meth)acrylic polymer may preferably contain structural units derived from hydroxyl group-containing monomers, more preferably structural units derived from 2-hydroxyethyl (meth)acrylate and/or 4-hydroxybutyl (meth)acrylate.
  • the (meth)acrylic polymer contains a structural unit derived from a hydroxyl group-containing monomer, the durability of the pressure-sensitive adhesive layer can be improved.
  • the content of the hydroxyl group-containing monomer is usually 0.01% by weight or more and 10% by weight or less in all monomer components that are raw materials for the (meth)acrylic polymer.
  • the monomer component more preferably contains a (meth)acrylic acid ester having an aromatic hydrocarbon group as a copolymerizable monomer.
  • (meth)acrylic acid esters having an aromatic hydrocarbon group include benzyl (meth)acrylate.
  • the (meth)acrylic polymer may more preferably contain structural units derived from (meth)acrylic acid esters having an aromatic hydrocarbon group, particularly preferably structural units derived from benzyl (meth)acrylate.
  • the content of the (meth)acrylic acid ester having an aromatic hydrocarbon group should In the monomer component, it is usually 1% by weight or more and 30% by weight or less.
  • the weight average molecular weight Mw of the (meth)acrylic polymer is, for example, 200,000 to 3,000,000, preferably 1,000,000 to 2,500,000, and more preferably 1,200,000 to 2,500,000. If the weight-average molecular weight Mw is within such a range, a pressure-sensitive adhesive layer with excellent durability (especially heat resistance) can be obtained. If the weight average molecular weight Mw exceeds 3,000,000, viscosity increase and/or gelation during polymer polymerization may occur.
  • the adhesive can contain a cross-linking agent.
  • a cross-linking agent an organic cross-linking agent, a polyfunctional metal chelate, or the like can be used.
  • organic cross-linking agents include isocyanate-based cross-linking agents, peroxide-based cross-linking agents, epoxy-based cross-linking agents, and imine-based cross-linking agents.
  • Polyfunctional metal chelates are those in which polyvalent metals are covalently or coordinately bonded to organic compounds.
  • a polyfunctional monomer can be used as a cross-linking agent.
  • Cross-linking agents can be used alone or in combination.
  • the cross-linking agent preferably contains an isocyanate-based cross-linking agent.
  • the amount of the cross-linking agent is usually 0.01 to 15 parts by weight with respect to 100 parts by weight of the (meth)acrylic polymer (base polymer).
  • the amount of the isocyanate-based cross-linking agent is usually 0.01 to 15 parts by weight, preferably 1 part by weight, per 100 parts by weight of the (meth)acrylic polymer. 0 to 10 parts by weight, more preferably 2.5 to 5 parts by weight.
  • the amount of the peroxide cross-linking agent is usually 0.01 to 2 parts by weight with respect to 100 parts by weight of the (meth)acrylic polymer. , preferably 0.1 to 0.5 parts by weight.
  • the blending ratio of the cross-linking agents is within the above range, when a reactive group-containing monomer is included in the raw material monomer component of the (meth)acrylic polymer, it will be described later.
  • the elastic modulus of the pressure-sensitive adhesive layer can be smoothly adjusted within a desired range.
  • the adhesive may contain a reactive functional group-containing silane coupling agent.
  • the reactive functional group is typically a functional group other than an acid anhydride group.
  • functional groups other than acid anhydride groups include epoxy group, mercapto group, amino group, isocyanate group, isocyanurate group, vinyl group, styryl group, acetoacetyl group, ureido group, thiourea group, and (meth)acrylic group. , heterocyclic groups, and combinations thereof.
  • Silane coupling agents containing reactive functional groups can be used alone or in combination.
  • the amount of the reactive functional group-containing silane coupling agent is usually 0.001 parts by weight with respect to 100 parts by weight of the (meth)acrylic polymer. 5 parts by weight or less.
  • the adhesive may contain a (meth)acrylic oligomer and/or an ionic compound. Moreover, the adhesive may contain an additive. Specific examples of additives include powders such as colorants and pigments, dyes, surfactants, plasticizers, tackifiers, surface lubricants, leveling agents, softeners, antioxidants, anti-aging agents, light Stabilizers, ultraviolet absorbers, polymerization inhibitors, inorganic or organic fillers, metal powders, particles, and foils can be used. Also, a redox system with a reducing agent added may be employed within a controllable range. Also, the adhesive may contain a polyether compound having a reactive group (for example, a reactive silyl group).
  • the type, number, combination, content, etc. of additives can be appropriately set according to the purpose.
  • the content of the additive is preferably 5 parts by weight or less, more preferably 3 parts by weight or less, and still more preferably 1 part by weight or less with respect to 100 parts by weight of the (meth)acrylic polymer.
  • the second adhesive layer 5 is arranged on the side opposite to the viewing side of the retardation layer 3 .
  • the thickness of the second adhesive layer 5 is typically 10 ⁇ m or more, preferably 14 ⁇ m or more, and typically 20 ⁇ m or less, preferably 17 ⁇ m or less.
  • the second adhesive layer 5 is formed from an adhesive (pressure-sensitive adhesive).
  • the second pressure-sensitive adhesive layer 5 is formed, for example, by applying the pressure-sensitive adhesive on any appropriate separator film to the thickness described above, and then transferred from the separator film to the retardation layer 3 .
  • the adhesive is as described in section D above regarding the first adhesive layer.
  • the second adhesive layer 5 may be formed from the same adhesive as the first adhesive layer 4, or may be formed from a different adhesive.
  • the optical laminate 1 may further include other optical functional layers.
  • the type, characteristics, number, combination, arrangement position, etc. of the optical function layers that can be provided in the optical layered body 1 can be appropriately set according to the purpose.
  • the optical laminate 1 may further have a conductive layer or an isotropic substrate with a conductive layer (neither is shown).
  • a conductive layer or an isotropic substrate with a conductive layer is typically provided between the retardation layer 3 and the second adhesive layer 5 .
  • the optical laminate can be applied to a so-called inner touch panel type input display device in which a touch sensor is incorporated between an image display cell and a polarizing plate.
  • the optical laminate 1 may further include other retardation layers.
  • Other optical properties of the retardation layer for example, refractive index properties, in-plane retardation, Nz coefficient, photoelastic coefficient), thickness, arrangement position, etc. can be appropriately set according to the purpose.
  • Image Display Device The optical layered body according to the above items A to F can be applied to an image display device. Therefore, one embodiment of the present invention also includes an image display device using such an optical laminate. Typical examples of image display devices include liquid crystal display devices and organic EL display devices. An image display device according to an embodiment of the present invention typically includes the optical layered body described in the above items A to F on its viewing side.
  • the image display device includes an image display panel.
  • the image display panel includes image display cells.
  • An image display device may be called an optical display device, an image display panel may be called an optical display panel, and an image display cell may be called an optical display cell.
  • the shear storage modulus (23°C) can be evaluated by the following method. First, a measurement sample (adhesive layer) made of an adhesive PSA1 or PSA2, which will be described later, is prepared. The shape of the measurement sample is disc-shaped. The measurement sample has a bottom diameter of 8 mm and a thickness of 2 mm. The sample for measurement may be obtained by punching a disc-shaped laminate from a laminate in which a plurality of pressure-sensitive adhesive layers are laminated. Next, a dynamic viscoelasticity measurement is performed on the measurement sample. For dynamic viscoelasticity measurement, for example, ARES-G2 manufactured by TA Instruments can be used.
  • the storage elastic modulus G' of the pressure-sensitive adhesive layer at 23°C can be specified.
  • the conditions for the dynamic viscoelasticity measurement are as follows. ⁇ Measurement conditions Frequency: 1Hz Deformation mode: Torsion Measurement temperature: -70°C to 150°C Heating rate: 5°C/min
  • Polarizing plate 1-1 Preparation of polarizing plate 1-1.
  • Polarizing plate P1 having a polarizer with a thickness of 12 ⁇ m
  • a long roll of polyvinyl alcohol (PVA) resin film (manufactured by Kuraray Co., Ltd., product name “PE3000”) having a thickness of 30 ⁇ m is uniaxially stretched in the longitudinal direction by a roll stretching machine so as to be 5.9 times the length.
  • swelling, dyeing, cross-linking, and washing treatments were performed, and finally, a drying treatment was performed to prepare a polarizer having a thickness of 12 ⁇ m.
  • the swelling treatment the film was stretched 2.2 times while being treated with pure water at 20°C.
  • the dyeing treatment is performed in an aqueous solution at 30° C. in which the weight ratio of iodine and potassium iodide is 1:7 and the iodine concentration is adjusted so that the single transmittance of the resulting polarizer is 45.0%. while stretching to 1.4 times.
  • the cross-linking treatment employed a two-step cross-linking treatment, and the first-step cross-linking treatment was performed by stretching the film 1.2 times while treating it in an aqueous solution of boric acid and potassium iodide at 40°C.
  • the boric acid content of the aqueous solution for the first-stage cross-linking treatment was 5.0% by weight, and the potassium iodide content was 3.0% by weight.
  • the film was stretched 1.6 times while being treated in an aqueous solution of boric acid and potassium iodide at 65°C.
  • the boric acid content of the aqueous solution for the second-stage cross-linking treatment was 4.3% by weight, and the potassium iodide content was 5.0% by weight.
  • the cleaning treatment was performed with an aqueous solution of potassium iodide at 20°C.
  • the potassium iodide content of the aqueous solution for the cleaning treatment was 2.6% by weight.
  • the drying treatment was performed at 70° C. for 5 minutes to obtain a polarizer.
  • a cycloolefin resin film (thickness: 25 ⁇ m) as a first protective layer was attached to the surface of the obtained polarizer via an ultraviolet curable adhesive.
  • the curable adhesive was applied so as to have a total thickness of about 1 ⁇ m, and was bonded using a roll machine. After that, UV rays were irradiated from the cycloolefin resin film side to cure the adhesive.
  • a triacetyl cellulose resin film (thickness: 25 ⁇ m) as a second protective layer was attached to the surface of the polarizer opposite to the first protective layer in the same manner as described above.
  • a polarizing plate P1 having a structure of cycloolefin resin film (first protective layer)/polarizer/triacetylcellulose resin film (second protective layer) was obtained.
  • Polarizing plate P2 having a polarizer with a thickness of 5 ⁇ m
  • a long amorphous isophthalic copolymerized polyethylene terephthalate film (thickness: 100 ⁇ m) having a Tg of about 75° C. was used as the thermoplastic resin substrate, and one side of the resin substrate was subjected to corona treatment.
  • Polyvinyl alcohol degree of polymerization: 4,200, degree of saponification: 99.2 mol
  • acetoacetyl-modified PVA manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOSEFIMER" were mixed at a ratio of 9:1, and 100 parts by weight of PVA-based resin.
  • aqueous PVA solution (coating solution).
  • the above PVA aqueous solution was applied to the corona-treated surface of the resin base material and dried at 60° C. to form a PVA-based resin layer having a thickness of 13 ⁇ m, thereby producing a laminate.
  • the resulting laminate was uniaxially stretched 2.4 times in the machine direction (longitudinal direction) in an oven at 130° C. (in-air auxiliary stretching treatment).
  • the laminate was immersed in an insolubilizing bath (an aqueous boric acid solution obtained by mixing 4 parts by weight of boric acid with 100 parts by weight of water) at a liquid temperature of 40° C.
  • the finally obtained polarizer is added to a dyeing bath (iodine aqueous solution obtained by blending iodine and potassium iodide at a weight ratio of 1:7 with respect to 100 parts by weight of water) at a liquid temperature of 30 ° C. It was immersed for 60 seconds while adjusting the concentration so that the single transmittance (Ts) was a desired value (dyeing treatment). Next, it was immersed for 30 seconds in a cross-linking bath at a liquid temperature of 40°C (an aqueous solution of boric acid obtained by blending 3 parts by weight of potassium iodide and 5 parts by weight of boric acid with respect to 100 parts by weight of water).
  • crosslinking treatment After that, while immersing the laminate in an aqueous solution of boric acid (boric acid concentration: 4% by weight, potassium iodide concentration: 5% by weight) at a liquid temperature of 70° C., the laminate was moved vertically (longitudinally) between rolls with different peripheral speeds. Uniaxial stretching was performed so that the stretching ratio was 5.5 times (underwater stretching treatment). After that, the laminate was immersed in a washing bath (aqueous solution obtained by blending 4 parts by weight of potassium iodide with 100 parts by weight of water) at a liquid temperature of 20° C. (washing treatment).
  • a washing bath aqueous solution obtained by blending 4 parts by weight of potassium iodide with 100 parts by weight of water
  • a polarizer having a thickness of about 5 ⁇ m was formed on the resin substrate.
  • a cycloolefin resin film (thickness: 25 ⁇ m) as a first protective layer was attached to the surface of the obtained polarizer (the surface opposite to the resin substrate) via an ultraviolet curable adhesive. .
  • the curable adhesive was applied so as to have a total thickness of about 1 ⁇ m, and was bonded using a roll machine. After that, UV rays were irradiated from the cycloolefin resin film side to cure the adhesive.
  • a polarizing plate P2 having a structure of cycloolefin resin film (first protective layer)/polarizer/triacetylcellulose resin film (second protective layer) was obtained.
  • the solution of the above compound is returned to room temperature, and the solution of the above compound is added with 3 parts by weight of Irgacure 907 (manufactured by BASF Japan), 0.2 parts by weight of Megafac F-554 (manufactured by DIC), and p -0.1 parts by weight of methoxyphenol (MEHQ) was added and further stirred.
  • the solution after stirring was transparent and uniform.
  • the resulting solution was filtered through a 0.20 ⁇ m membrane filter to obtain a polymerizable composition.
  • the polyimide solution for alignment film was applied to a glass substrate having a thickness of 0.7 mm by spin coating, dried at 100° C. for 10 minutes, and then baked at 200° C. for 60 minutes to obtain a coating film.
  • the resulting coating film was rubbed with a commercially available rubbing device to form an alignment film.
  • the polymerizable composition obtained above was applied to the substrate (substantially, the alignment film) by spin coating, and dried at 100° C. for 2 minutes. After cooling the obtained coating film to room temperature, it was irradiated with ultraviolet rays for 30 seconds at an intensity of 30 mW/cm 2 using a high-pressure mercury lamp to obtain an aligned solid layer R1 of a liquid crystal compound.
  • the in-plane retardation Re(550) of the alignment fixed layer R1 of the liquid crystal compound was 130 nm.
  • the Re(450)/Re(550) of the alignment fixed layer R1 of the liquid crystal compound was 0.851, indicating reverse dispersion wavelength characteristics.
  • the alignment fixed layer R1 of the liquid crystal compound can function as a ⁇ /4 plate.
  • polyester carbonate-based resin produced was extruded into water, and strands were cut to obtain pellets. After vacuum drying the obtained polyester carbonate resin (pellet) at 80 ° C.
  • the retardation film R2 can function as a ⁇ /4 plate.
  • the (meth)acrylic polymer (A) had a weight average molecular weight (Mw) of 2,200,000.
  • Adhesive (adhesive composition) PSA1 to PSA3 The solution of the (meth)acrylic polymer (A) was added with the cross-linking agent (B) (manufactured by Tosoh Corporation , trade name “Coronate L”) and a reactive functional group-containing silane coupling agent (manufactured by Shin-Etsu Chemical Co., Ltd., trade name “KBM-403”) are mixed to form a solvent-based adhesive (adhesive composition) PSA1.
  • B cross-linking agent
  • KBM-403 reactive functional group-containing silane coupling agent
  • each of the obtained adhesives PSA1 to PSA3 was applied to the release surface of a 38 ⁇ m thick PET film (MRF38, manufactured by Mitsubishi Chemical Polyester Film Co., Ltd.), which is a release film whose release surface was subjected to silicone treatment. was dried for a predetermined time in an air circulation type constant temperature oven set at a predetermined temperature to form an adhesive layer (adhesive sheet) having a thickness shown in Table 2.
  • the pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive PSA1 or PSA2 is the first pressure-sensitive adhesive layer
  • the pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive PSA3 is the second pressure-sensitive adhesive layer.
  • a fountain coater was used to apply the adhesive.
  • the drying conditions for forming the adhesive layer (adhesive sheet) were 155° C. and 80 seconds.
  • a retardation layer (orientation and solidification layer R1 of a liquid crystal compound) was attached to the polarizing plate P1 via a first adhesive layer formed from an adhesive PSA1.
  • a first pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive PSA1 and having the thickness shown in Table 2 was transferred from the release film to the surface of the second protective layer opposite to the viewing side.
  • the retardation layer (orientation fixed layer R1 of liquid crystal compound) was brought into contact with the first pressure-sensitive adhesive layer and attached to the polarizing plate P1.
  • the slow axis of the retardation layer (orientation fixed layer R1 of the liquid crystal compound) was adjusted to form an angle of 45° with respect to the absorption axis of the polarizer.
  • the second adhesive layer formed from the adhesive PSA3 was transferred from the release film to the retardation layer.
  • Table 2 shows the thickness of each layer included in the optical layered body and the shear storage elastic modulus G' of the pressure-sensitive adhesive forming the first pressure-sensitive adhesive layer. Further, the optical layered body was subjected to the above reflection hue change measurement. The results are shown in Table 2.
  • Example 3 An optical laminate was obtained in the same manner as in Example 2, except that the first adhesive layer formed from the adhesive PSA1 was changed to the first adhesive layer formed from the above-described adhesive PSA2. rice field.
  • Example 4 An optical laminate was obtained in the same manner as in Example 1, except that the polarizing plate P1 was changed to the polarizing plate P2 described above.
  • optical laminate of the present invention can be suitably used for image display devices (typically, liquid crystal display devices and organic EL display devices).

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Organic Chemistry (AREA)
  • Polarising Elements (AREA)
  • Laminated Bodies (AREA)
  • Liquid Crystal (AREA)
  • Electroluminescent Light Sources (AREA)
  • Adhesive Tapes (AREA)
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010044211A (ja) * 2008-08-12 2010-02-25 Sumitomo Chemical Co Ltd 偏光板及びそれを用いた画像表示装置
JP2017054093A (ja) * 2015-07-22 2017-03-16 日東電工株式会社 位相差層付偏光板および画像表示装置
WO2019131624A1 (ja) * 2017-12-28 2019-07-04 住友化学株式会社 偏光板
JP2020126226A (ja) * 2019-02-04 2020-08-20 住友化学株式会社 偏光板および表示装置
WO2021070525A1 (ja) * 2019-10-10 2021-04-15 日東電工株式会社 位相差層および粘着剤層付偏光板およびそれを用いた有機エレクトロルミネセンス表示装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010044211A (ja) * 2008-08-12 2010-02-25 Sumitomo Chemical Co Ltd 偏光板及びそれを用いた画像表示装置
JP2017054093A (ja) * 2015-07-22 2017-03-16 日東電工株式会社 位相差層付偏光板および画像表示装置
WO2019131624A1 (ja) * 2017-12-28 2019-07-04 住友化学株式会社 偏光板
JP2020126226A (ja) * 2019-02-04 2020-08-20 住友化学株式会社 偏光板および表示装置
WO2021070525A1 (ja) * 2019-10-10 2021-04-15 日東電工株式会社 位相差層および粘着剤層付偏光板およびそれを用いた有機エレクトロルミネセンス表示装置

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