WO2020115977A1 - 位相差層付偏光板およびそれを用いた画像表示装置 - Google Patents

位相差層付偏光板およびそれを用いた画像表示装置 Download PDF

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Publication number
WO2020115977A1
WO2020115977A1 PCT/JP2019/034990 JP2019034990W WO2020115977A1 WO 2020115977 A1 WO2020115977 A1 WO 2020115977A1 JP 2019034990 W JP2019034990 W JP 2019034990W WO 2020115977 A1 WO2020115977 A1 WO 2020115977A1
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Prior art keywords
layer
polarizing plate
liquid crystal
retardation
retardation layer
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PCT/JP2019/034990
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English (en)
French (fr)
Japanese (ja)
Inventor
由紀 長谷川
山崎　達也
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Nitto Denko Corp
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Nitto Denko Corp
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Priority to SG11202105120QA priority Critical patent/SG11202105120QA/en
Priority to CN201980079442.0A priority patent/CN113167958A/zh
Priority to KR1020217016804A priority patent/KR102873163B1/ko
Publication of WO2020115977A1 publication Critical patent/WO2020115977A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/08—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of polarising materials
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • 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
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3016—Polarising elements involving passive liquid crystal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • 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
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional [2D] radiating surfaces
    • H05B33/14—Light sources with substantially two-dimensional [2D] radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
    • 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
    • H10K59/50—OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements

Definitions

  • the present invention relates to a polarizing plate with a retardation layer and an image display device using the same.
  • the present invention has been made to solve the above-mentioned conventional problems, and its main purpose is to have an alignment solidified layer of a liquid crystal compound, with a retardation layer in which peeling of the alignment solidified layer of the liquid crystal compound is suppressed. It is to provide a polarizing plate.
  • the polarizing plate with a retardation layer of the present invention is a polarizing plate comprising a polarizer and a protective layer on at least one side of the polarizer; and a retardation laminated on the polarizing plate via a first adhesive layer. And layers.
  • the retardation layer is an alignment and solidification layer of a liquid crystal compound, and includes a permeation layer formed by permeation of the adhesive of the first adhesive layer in the vicinity of the interface with the first adhesive layer.
  • the polarizing plate includes the polarizer and a protective layer disposed on the side of the polarizer opposite to the retardation layer.
  • the polarizing plate includes the polarizer and protective layers disposed on both sides of the polarizer.
  • the protective layer disposed on the retardation layer side of the polarizer is formed by permeation of the adhesive of the first adhesive layer in the vicinity of the interface with the first adhesive layer. It may include layers.
  • the retardation layer is a single layer of an alignment-fixed layer of a liquid crystal compound, Re(550) of the retardation layer is 100 nm to 190 nm, and the retardation axis of the retardation layer is The angle formed by the absorption axis of the polarizer is 40° to 50°.
  • the retardation layer is a second alignment layer of the first liquid crystal compound, and a second alignment layer of the first liquid crystal compound is laminated on the alignment solidification layer of the first liquid crystal compound via a second adhesive layer.
  • An alignment solidification layer of a liquid crystal compound; the alignment solidification layer of the first liquid crystal compound and the alignment solidification layer of the second liquid crystal compound are respectively provided in the vicinity of an interface with the second adhesive layer, And an adhesive layer of the adhesive layer of (1).
  • the Re(550) of the alignment-solidified layer of the first liquid crystal compound is 200 nm to 300 nm, and the angle formed by the slow axis thereof and the absorption axis of the polarizer is 10° to 20°;
  • the Re(550) of the alignment-solidified layer of the liquid crystal compound is 100 nm to 190 nm, and the angle formed between its slow axis and the absorption axis of the polarizer is 70° to 80°.
  • the adhesives of the first and second adhesive layers each include acryloylmorpholine.
  • an image display device is provided. This image display device includes the above polarizing plate with a retardation layer.
  • the adhesive of the adhesive layer permeates in the vicinity of the interface with the adjacent adhesive layer in the alignment fixed layer of the liquid crystal compound.
  • FIG. 1 is a schematic cross-sectional view of a polarizing plate with a retardation layer according to one embodiment of the present invention.
  • FIG. 6 is a schematic cross-sectional view of a polarizing plate with a retardation layer according to another embodiment of the present invention. It is a schematic sectional drawing of the polarizing plate with a retardation layer by another embodiment of this invention.
  • 3 is a transmission electron microscope (TEM) image showing the state of the interface between the adhesive layer and the retardation layer in the polarizing plate with a retardation layer of Example 1.
  • 7 is a TEM image showing a state of an interface between an adhesive layer and a retardation layer in a polarizing plate with a retardation layer of Comparative Example 1.
  • TEM transmission electron microscope
  • Refractive index (nx, ny, nz) “Nx” is the refractive index in the direction in which the in-plane refractive index is maximum (that is, the slow axis direction), and “ny” is the direction in the plane that is orthogonal to the slow axis (that is, the fast axis direction).
  • nz is the refractive index in the thickness direction.
  • In-plane retardation (Re) “Re( ⁇ )” is an in-plane retardation measured with light having a wavelength of ⁇ nm at 23° C.
  • Re(550) is an in-plane retardation measured with light having a wavelength of 550 nm at 23° C.
  • Phase difference (Rth) in the thickness direction is a phase difference in the thickness direction measured with light having a wavelength of ⁇ nm at 23° C.
  • “Rth(550)” is the phase difference in the thickness direction measured with light having a wavelength of 550 nm at 23° C.
  • FIG. 1 is a schematic sectional view of a polarizing plate with a retardation layer according to one embodiment of the present invention.
  • the polarizing plate 100 with a retardation layer in the illustrated example includes a polarizing plate 10 and a retardation layer 20 laminated on the polarizing plate 10 via a first adhesive layer 31.
  • the polarizing plate typically includes a polarizer and a protective layer disposed on at least one side of the polarizer.
  • the polarizing plate 10 in the illustrated example includes a polarizer 11 and a first protective layer 12 arranged on one side of the polarizer 11 (on the side opposite to the retardation layer).
  • the retardation layer 20 is an alignment and solidification layer of a liquid crystal compound, and is formed by penetrating the adhesive of the first adhesive layer 31 near the interface with the first adhesive layer 31. Including a permeation layer 20a.
  • peeling of the retardation layer (alignment solidification layer of the liquid crystal compound) can be significantly suppressed.
  • peeling of the retardation layer can be suppressed particularly remarkably.
  • the peeling strength between the first adhesive layer and the alignment-solidified layer of the liquid crystal compound becomes very large, and the alignment between the first adhesive layer and the liquid crystal compound is increased in a normal peeling operation. It is possible to prevent peeling from the solidified layer and also to prevent peeling between other layers (for example, peeling between the polarizer and the first adhesive layer).
  • FIG. 2 is a schematic sectional view of a polarizing plate with a retardation layer according to another embodiment of the present invention.
  • the polarizing plate 10 includes a polarizer 11 and a first protective layer 12 disposed on one side of the polarizer 11 (on the side opposite to the retardation layer).
  • the second protective layer 13 disposed on the other side (the retardation layer side) of the polarizer 11 is included.
  • the second protective layer 13 includes a permeation layer 13a formed by permeating the adhesive of the first adhesive layer 31 near the interface with the first adhesive layer 31. Good.
  • the permeation layer 13a for example, peeling between the first adhesive layer and the alignment-fixed layer of the liquid crystal compound is prevented, and peel strength between the first adhesive layer and the second protective layer is increased. can do.
  • the permeation layer 13a is optional and may or may not be formed in the second protective layer 13.
  • the retardation layer 20 is an alignment solidified layer of a liquid crystal compound as described above.
  • the retardation layer 20 may be a single layer of the orientation solidified layer as shown in FIG. 1 and FIG. 2, or a laminated layer of the first orientation solidified layer 21 and the second orientation solidified layer 22 as shown in FIG. It may have a structure.
  • the first alignment solidified layer 21 and the second alignment solidified layer 22 are laminated via the second adhesive layer 32.
  • the first alignment solidified layer 21 includes a permeation layer 21a formed by permeating the adhesive of the second adhesive layer 32 in the vicinity of the interface with the second adhesive layer 32;
  • the orientation solidification layer 22 includes a permeation layer 22a formed by permeation of the adhesive of the second adhesive layer 32 in the vicinity of the interface with the second adhesive layer 32.
  • peeling between the second adhesive layer and the first alignment solidified layer 21 and the second alignment solidified layer 22 can be suppressed significantly.
  • the second adhesive layer is not peeled from the first alignment solidified layer 21 and the second alignment solidified layer 22, and cohesive failure of the second adhesive layer may occur.
  • the permeation layer 20a formed by permeating the adhesive of the first adhesive layer 31 near the interface of the retardation layer 20 with the first adhesive layer 31 may be formed. Therefore, the first alignment solidified layer 21 and the second alignment solidified layer 22 may be laminated via, for example, an adhesive layer.
  • the permeation layer is formed by permeation of the adhesive of the adhesive layer.
  • the permeation layers 20a, 21a, and 22a are the portions in which the adhesive component is present in the alignment-solidified layers 20, 21 and 22 of the liquid crystal compound respectively;
  • the permeation layer 13a is the second protective layer 13.
  • the permeation of the adhesive substantially, the curing component before curing
  • the thickness of the permeation layer is preferably 5 nm to 100 nm, more preferably 10 nm to 50 nm.
  • the ratio of the thickness of the permeation layer to the thickness of the alignment/solidification layer of the liquid crystal compound (permeation layer/alignment/solidification layer) is preferably 0.2% to 20%, more preferably 0.2% to 10%.
  • peeling can be suppressed well and display unevenness can be suppressed well.
  • the thickness of the permeation layer is too large, the permeation layer and/or the adhesive layer may become brittle and may be easily peeled.
  • the thickness of the permeation layer can be measured from a transmission electron microscope (TEM) image of a cross section of the polarizing plate with a retardation layer.
  • TEM transmission electron microscope
  • the peel strength between the first adhesive layer 31 and the alignment-solidified layer 20 of the liquid crystal compound is preferably 0.7 N/15 mm or more, more preferably 1.0 N/15 mm or more, and further preferably 1.5 N. /15 mm or more. It is difficult to specify the upper limit of the peel strength. Before the first adhesive layer 31 and the alignment-fixed layer 20 of the liquid crystal compound are separated, cohesive failure of the first adhesive layer or the first adhesive layer and the polarizing plate (typically, the second adhesive layer). This is because delamination from the protective layer) occurs.
  • the peel strength between the second adhesive layer 32 and the first alignment solidified layer 21 and the second alignment solidified layer 22 is also the same. The peel strength can be measured, for example, at a peel angle of 90° and a peel speed of 300 mm/min.
  • the polarizing plate of the polarizing plate with retardation layer of FIG. 3 may be provided with a second protective layer as shown in FIG. 2; the retardation layer of the polarizing plate with retardation layer of FIG. 3 may have a laminated structure of a first alignment solidified layer 21 and a second alignment solidified layer 22; the retardation layer of the polarizing plate with a retardation layer of FIGS.
  • Any alignment-fixed layer of a liquid crystal compound may be replaced with an optically equivalent configuration.
  • the polarizing plate with retardation layer may further include other optical functional layers.
  • the polarizing plate with a retardation layer may further have another retardation layer and/or a conductive layer or an isotropic substrate with a conductive layer (none of which is shown).
  • Another retardation layer and a conductive layer or an isotropic substrate with a conductive layer are typically provided outside the retardation layer 20 (on the side opposite to the polarizing plate 10).
  • Such another retardation layer may be provided, for example, when the retardation layer 20 is a single layer of the orientation solidified layer.
  • the polarizing plate with a retardation layer is a so-called inner layer in which a touch sensor is incorporated between an image display cell (for example, an organic EL cell) and the polarizing plate. It can be applied to a touch panel type input display device.
  • the type, characteristics, number, combination, arrangement position and the like of the optical functional layers that can be provided in the polarizing plate with a retardation layer can be appropriately set according to the purpose.
  • the polarizing plate with a retardation layer of the present invention may have a sheet-like shape or a long shape.
  • “long shape” means an elongated shape having a length sufficiently longer than the width, and for example, an elongated shape having a length 10 times or more, preferably 20 times or more the width. Including.
  • the long polarizing plate with a retardation layer is typically rollable.
  • an adhesive layer (not shown) is provided as the outermost layer on the opposite side of the retardation layer from the polarizing plate, and the polarizing plate with retardation layer can be attached to the image display cell. Further, it is preferable that a release film is temporarily attached to the surface of the pressure-sensitive adhesive layer until the polarizing plate with a retardation layer is used. By temporarily attaching the release film, the pressure-sensitive adhesive layer can be protected and the roll of the polarizing plate with the retardation layer can be formed.
  • the total thickness of the polarizing plate with a retardation layer is preferably 100 ⁇ m or less, more preferably 80 ⁇ m or less, further preferably 60 ⁇ m or less, and particularly preferably 55 ⁇ m or less.
  • the lower limit of the total thickness can be, for example, 28 ⁇ m.
  • an extremely thin polarizing plate with a retardation layer can be realized as described above.
  • Such a polarizing plate with a retardation layer can have extremely excellent flexibility and bending durability.
  • Such a polarizing plate with a retardation layer can be particularly preferably applied to a curved image display device and/or a bendable or bendable image display device.
  • the total thickness of the polarizing plate with a retardation layer means the total thickness of all layers constituting the polarizing plate with a retardation layer, excluding the pressure-sensitive adhesive layer.
  • Polarizing plate B-1 Polarizer Any appropriate polarizer can be adopted as the polarizer 11.
  • the resin film forming the polarizer may be a single-layer resin film or a laminate of two or more layers.
  • the polarizer composed of a single layer resin film include hydrophilic polymer films such as polyvinyl alcohol (PVA) film, partially formalized PVA film, and ethylene/vinyl acetate copolymer partially saponified film.
  • hydrophilic polymer films such as polyvinyl alcohol (PVA) film, partially formalized PVA film, and ethylene/vinyl acetate copolymer partially saponified film.
  • PVA polyvinyl alcohol
  • partially formalized PVA film partially formalized PVA film
  • ethylene/vinyl acetate copolymer partially saponified film examples thereof include polyene oriented films such as those subjected to dyeing treatment and stretching treatment with a dichroic substance such as iodine or dichroic dye, PVA dehydration-treated products and polyvinyl chloride dehydrochlorination products.
  • a polarizer obtained by dyeing a PVA-based film with iodine and uniaxially stretching it is used because it has excellent optical properties
  • the above dyeing with iodine is performed, for example, by immersing the PVA film in an aqueous iodine solution.
  • the stretching ratio of the uniaxial stretching is preferably 3 to 7 times. Stretching may be performed after the dyeing treatment or may be performed while dyeing. Further, it may be stretched and then dyed.
  • the PVA film is subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment and the like. For example, by dipping the PVA-based film in water and washing it with water before dyeing, not only the stains on the surface of the PVA-based film and the antiblocking agent can be washed, but also the PVA-based film is swollen to prevent uneven dyeing. Can be prevented.
  • the polarizer obtained using the laminate include a laminate of a resin base material and a PVA-based resin layer (PVA-based resin film) laminated on the resin base material, or a resin base material and the resin.
  • a polarizer obtained by using a laminate with a PVA-based resin layer formed by coating on a base material examples include a polarizer obtained by using a laminate with a PVA-based resin layer formed by coating on a base material.
  • 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, for example, a resin base material obtained by applying a PVA-based resin solution to the resin base material and drying the solution.
  • a PVA-based resin layer is formed thereon to obtain a laminate of a resin base material and a PVA-based resin layer; the laminate is stretched and dyed to form the PVA-based resin layer as a polarizer; obtain.
  • the stretching typically includes dipping the laminate in a boric acid aqueous solution and stretching. Further, the stretching may further include optionally stretching the laminate in air at a high temperature (for example, 95° C. or higher) before stretching in the aqueous boric acid solution.
  • the resin base material/polarizer laminate thus obtained may be used as it is (that is, the resin base material may be used as a protective layer of the polarizer), or the resin base material is peeled from the resin base material/polarizer laminate.
  • any appropriate protective layer may be laminated and used on the peeled surface depending on the purpose. Details of the method for manufacturing such a polarizer are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580. The entire description of the publication is incorporated herein by reference.
  • the thickness of the polarizer is preferably 15 ⁇ m or less, more preferably 1 ⁇ m to 12 ⁇ m, further preferably 3 ⁇ m to 12 ⁇ m, and particularly preferably 3 ⁇ m to 8 ⁇ m.
  • the thickness of the polarizer is in such a range, curling at the time of heating can be favorably suppressed, and good appearance durability at the time of heating can be obtained.
  • the polarizer preferably exhibits absorption dichroism at any wavelength of 380 nm to 780 nm.
  • the single transmittance of the polarizer is 43.0% to 46.0%, and preferably 44.5% to 46.0%.
  • the polarization degree of the polarizer is preferably 97.0% or more, more preferably 99.0% or more, and further preferably 99.9% or more.
  • the first protective layer 12 and the second protective layer 13 are each formed of any suitable film that can be used as a protective layer of a polarizer.
  • the material that is the main component of the film include cellulose resins such as triacetyl cellulose (TAC), polyester resins, polyvinyl alcohol resins, polycarbonate resins, polyamide resins, polyimide resins, polyether sulfone resins, and polysulfone resins.
  • TAC triacetyl cellulose
  • polyester resins polyvinyl alcohol resins
  • polycarbonate resins polyamide resins
  • polyimide resins polyether sulfone resins
  • polysulfone resins polysulfone resins.
  • thermosetting resin such as a (meth)acrylic resin, a urethane resin, a (meth)acrylic urethane resin, an epoxy resin, a silicone resin, or an ultraviolet curable resin
  • a glassy polymer such as a siloxane polymer may be used.
  • the polymer film described in JP 2001-343529 A (WO 01/37007) can also be used.
  • the polymer film can be, for example, an extruded product of the resin composition.
  • the polarizing plate with a retardation layer is typically disposed on the viewing side of the image display device, and the first protective layer 12 is typically disposed on the viewing side as described later. It Therefore, the first protective layer 12 may be subjected to surface treatment such as hard coat treatment, antireflection treatment, sticking prevention treatment, and antiglare treatment, if necessary. Further/or, if necessary, the first protective layer 12 is processed to improve the visibility when viewed through polarized sunglasses (typically, a (elliptical) circular polarization function is added, (Giving an ultrahigh phase difference) may be applied. By performing such processing, excellent visibility can be realized even when the display screen is viewed through a polarizing lens such as polarized sunglasses. Therefore, the polarizing plate with a retardation layer can be suitably applied to an image display device that can be used outdoors.
  • polarized sunglasses typically, a (elliptical) circular polarization function is added, (Giving an ultrahigh phase difference
  • the thickness of the first protective layer 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.
  • the thickness of the outer protective layer is the thickness including the thickness of the surface treated layer.
  • the second protective layer 13 is, in one embodiment, preferably optically isotropic.
  • “optically isotropic” means that the in-plane retardation Re(550) is 0 nm to 10 nm and the thickness direction retardation Rth(550) is ⁇ 10 nm to +10 nm.
  • the second protective layer 13 may be a retardation layer having any appropriate retardation value in one embodiment.
  • the in-plane retardation Re(550) of the retardation layer is, for example, 110 nm to 150 nm.
  • the thickness of the second protective layer is preferably 5 ⁇ m to 200 ⁇ m, more preferably 10 ⁇ m to 100 ⁇ m, still more preferably 10 ⁇ m to 60 ⁇ m.
  • the retardation layer 20 is an alignment-fixed layer of a liquid crystal compound.
  • the difference between nx and ny of the obtained retardation layer can be made significantly larger than that of the non-liquid crystal material. Therefore, the thickness of the retardation layer for obtaining a desired in-plane retardation. Can be significantly reduced. As a result, it is possible to realize a thinner polarizing plate with a retardation layer.
  • rod-shaped liquid crystal compounds are aligned in a state of being aligned in the slow axis direction of the retardation layer (homogeneous alignment).
  • liquid crystal compounds include liquid crystal compounds in which the liquid crystal phase is a nematic phase (nematic liquid crystal).
  • a liquid crystal compound for example, a liquid crystal polymer or a liquid crystal monomer can be used.
  • the liquid crystallinity of the liquid crystal compound may be lyotropic or thermotropic.
  • the liquid crystal polymer and the liquid crystal monomer may be used alone or in combination.
  • the liquid crystal monomer is preferably a polymerizable monomer and a crosslinkable monomer.
  • the alignment state of the liquid crystal monomer can be fixed by polymerizing or crosslinking (that is, curing) the liquid crystal monomer.
  • the alignment state can be fixed.
  • a polymer is formed by polymerization and a three-dimensional network structure is formed by crosslinking, but these are non-liquid crystalline. Therefore, in the formed retardation layer, for example, the transition to the liquid crystal phase, the glass phase, or the crystal phase due to the temperature change peculiar to the liquid crystal compound does not occur. As a result, the retardation layer becomes an extremely stable retardation layer which is not affected by temperature change.
  • the temperature range in which the liquid crystal monomer exhibits liquid crystallinity varies depending on its type. Specifically, the temperature range is preferably 40°C to 120°C, more preferably 50°C to 100°C, and most preferably 60°C to 90°C.
  • any suitable liquid crystal monomer may be adopted as the liquid crystal monomer.
  • the polymerizable mesogenic compounds described in JP-B-2002-533742 WO00/37585
  • EP358208 US5211877
  • EP66137 US4388453
  • WO93/22397 EP0261712, DE195504224, DE4408171, GB2280445 and the like
  • Specific examples of such a polymerizable mesogen compound include trade name LC242 of BASF, trade name E7 of Merck, and trade name LC-Silicon-CC3767 of Wacker-Chem.
  • the liquid crystal monomer for example, a nematic liquid crystal monomer is preferable.
  • the alignment-fixed layer of the liquid crystal compound is subjected to an alignment treatment on the surface of a predetermined base material, and a coating liquid containing a liquid crystal compound is applied to the surface to align the liquid crystal compound in a direction corresponding to the alignment treatment, It can be formed by fixing the orientation state.
  • the substrate is any suitable resin film, and the alignment-fixed layer formed on the substrate can be transferred to the surface of the polarizing plate 10.
  • the substrate can be the second protective layer 13. In this case, the transfer step can be omitted, and the roll-to-roll lamination can be performed continuously from the formation of the alignment solidified layer (retardation layer), so that the productivity is further improved.
  • orientation treatment Any suitable orientation treatment can be adopted as the orientation treatment.
  • mechanical orientation treatment include rubbing treatment and stretching treatment.
  • physical orientation treatment include magnetic field orientation treatment and electric field orientation treatment.
  • chemical alignment treatment include an oblique vapor deposition method and a photo-alignment treatment.
  • processing conditions for various alignment treatments any appropriate conditions can be adopted depending on the purpose.
  • Alignment of the liquid crystal compound is performed by processing at a temperature at which the liquid crystal compound exhibits a liquid crystal phase depending on the type of the liquid crystal compound. By performing such a temperature treatment, the liquid crystal compound takes a liquid crystal state, and the liquid crystal compound is aligned according to the alignment treatment direction on the surface of the base material.
  • the fixing of the alignment state is performed by cooling the liquid crystal compound aligned as described above in one embodiment.
  • the alignment state is fixed by subjecting the liquid crystal compound aligned as described above to a polymerization treatment or a crosslinking treatment.
  • liquid crystal compound and details of the method for forming the alignment fixed layer are described in, for example, JP-A-2006-163343. The description of the publication is incorporated herein by reference.
  • the retardation layer 20 is a single layer of an alignment-fixed layer of a liquid crystal compound, as shown in FIGS. 1 and 2.
  • the retardation layer 20 is composed of a single layer of an alignment-fixed layer of a liquid crystal compound, its thickness is preferably 0.5 ⁇ m to 7 ⁇ m, more preferably 1 ⁇ m to 5 ⁇ m.
  • the retardation layer is typically provided to impart antireflection properties to the polarizing plate, and can function as a ⁇ /4 plate when the retardation layer is a single layer of the orientation-fixed layer.
  • the in-plane retardation Re(550) of the retardation layer is preferably 100 nm to 190 nm, more preferably 110 nm to 170 nm, still more preferably 130 nm to 160 nm.
  • the Nz coefficient of the retardation layer is preferably 0.9 to 1.5, more preferably 0.9 to 1.3.
  • the retardation layer may exhibit an inverse dispersion wavelength characteristic in which the retardation value increases according to the wavelength of the measurement light, or may exhibit a positive wavelength dispersion characteristic in which the retardation value decreases according to the wavelength of the measurement light. It may well exhibit a flat wavelength dispersion characteristic in which the phase difference value hardly changes depending on the wavelength of the measurement light.
  • the retardation layer exhibits an inverse dispersion wavelength characteristic.
  • Re(450)/Re(550) of the retardation layer is preferably 0.8 or more and less than 1, and more preferably 0.8 or more and 0.95 or less. With such a configuration, it is possible to realize extremely excellent antireflection characteristics.
  • the angle ⁇ formed by the slow axis of the retardation layer 20 and the absorption axis of the polarizer 11 is preferably 40° to 50°, more preferably 42° to 48°, and further preferably about 45°. is there.
  • the angle ⁇ is in such a range, by using the ⁇ /4 plate as the retardation layer as described above, it is possible to obtain an excellent circular polarization property (as a result, an extremely excellent antireflection property).
  • a polarizing plate with a retardation layer can be obtained.
  • the retardation layer 20 may have a laminated structure of a first alignment fixed layer 21 and a second alignment fixed layer 22 as shown in FIG.
  • one of the first alignment solidified layer 21 and the second alignment solidified layer 22 can function as a ⁇ /4 plate, and the other can function as a ⁇ /2 plate. Therefore, the thicknesses of the first alignment solidified layer 21 and the second alignment solidified layer 22 can be adjusted so as to obtain a desired in-plane retardation of the ⁇ /4 plate or the ⁇ /2 plate.
  • the thickness of the first alignment solidification layer 21 is, for example, 2.0 ⁇ m to
  • the thickness of the second alignment solidified layer 22 is, for example, 1.0 ⁇ m to 2.0 ⁇ m.
  • the in-plane retardation Re(550) of the first alignment solidified layer is preferably 200 nm to 300 nm, more preferably 230 nm to 290 nm, and further preferably 250 nm to 280 nm.
  • the in-plane retardation Re(550) of the second alignment fixed layer is as described above for the single-layer alignment fixed layer.
  • the angle formed by the slow axis of the first alignment solidified layer and the absorption axis of the polarizer is preferably 10° to 20°, more preferably 12° to 18°, and further preferably about 15°. is there.
  • the angle formed by the slow axis of the second alignment solidified layer and the absorption axis of the polarizer is preferably 70° to 80°, more preferably 72° to 78°, and further preferably about 75°. is there.
  • the method for forming the first alignment solidified layer and the second alignment solidified layer, the optical characteristics, etc., with respect to the single layer alignment solidified layer, the above is described. As described in.
  • the first adhesive layer and the second adhesive layer are collectively described as an adhesive layer.
  • the first adhesive layer and the second adhesive layer may have the same structure or different structures.
  • any suitable adhesive capable of penetrating into the alignment-fixed layer of the liquid crystal compound to form a permeation layer can be adopted.
  • an active energy ray-curable adhesive is typically mentioned. Examples of the active energy ray curable adhesive include an ultraviolet ray curable adhesive and an electron beam curable adhesive.
  • examples of the active energy ray-curable adhesive include a radical-curable type, a cation-curable type, an anion-curable type, and a hybrid of a radical-curable type and a cation-curable type.
  • a radical curable ultraviolet curable adhesive can be used. This is because it is excellent in versatility and the characteristics (configuration) can be easily adjusted.
  • the adhesive typically contains a curing component and a photopolymerization initiator.
  • the curing component typically includes a monomer and/or oligomer having a functional group such as a (meth)acrylate group and a (meth)acrylamide group.
  • Specific examples of the curing component include tripropylene glycol diacrylate, 1,9-nonanediol diacrylate, tricyclodecane dimethanol diacrylate, phenoxydiethylene glycol acrylate, cyclic trimethylolpropane formal acrylate, dioxane glycol diacrylate, and EO-modified.
  • the adhesive contains a curing component having a heterocycle.
  • the curing component having a heterocycle include acryloylmorpholine, ⁇ -butyrolactone acrylate, unsaturated fatty acid hydroxyalkyl ester-modified ⁇ -caprolactone, and N-methylpyrrolidone. More preferred curing components are unsaturated fatty acid hydroxyalkyl ester modified ⁇ -caprolactone and acryloylmorpholine, and particularly preferred curing components are acryloylmorpholine.
  • the curing component having a heterocycle is preferably 50 parts by weight or more, more preferably 60 parts by weight, relative to 100 parts by weight of the curing component (the total of the curing component and the oligomer component when the oligomer component described below is present). Above, more preferably 70 to 95 parts by weight can be contained in the adhesive.
  • Acryloylmorpholine is preferably 5 parts by weight to 60 parts by weight, more preferably 10 parts by weight to 50 parts by weight, relative to 100 parts by weight of the curing component (the total of the curing component and the oligomer component when an oligomer component is present). It may be contained in the adhesive in parts.
  • the adhesive may further contain an oligomer component in addition to the above curing component.
  • an oligomer component By using the oligomer component, the viscosity of the adhesive before curing can be reduced and the operability can be improved.
  • Typical examples of the oligomer component include (meth)acrylic oligomers.
  • Examples of the (meth)acrylic monomer constituting the (meth)acrylic oligomer include (meth)acrylic acid (C 1 to C 20) alkyl esters, cycloalkyl (meth)acrylates (eg, cyclohexyl (meth)acrylate, Cyclopentyl (meth)acrylate, etc., aralkyl (meth)acrylate (eg, benzyl (meth)acrylate), polycyclic (meth)acrylate (eg, 2-isobornyl (meth)acrylate, 2-norbornylmethyl (meth) ) Acrylate, 5-norbornen-2-yl-methyl(meth)acrylate, 3-methyl-2-norbornylmethyl(meth)acrylate, etc., hydroxyl group-containing (meth)acrylic acid esters (eg hydroxyethyl( (Meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2,3-dihydroxypropylmethyl-but
  • (meth)acrylic acid (having 1 to 20 carbon atoms) alkyl esters include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, and 2-methyl.
  • photopolymerization initiator a well-known photopolymerization initiator in the industry can be used in a compounding amount well known in the industry, and thus detailed description thereof will be omitted.
  • the thickness of the adhesive layer (after curing the adhesive) is preferably 0.1 ⁇ m to 3.0 ⁇ m. By applying the adhesive so as to have such a thickness, the permeation layer having an appropriate thickness can be formed.
  • the retardation Rth(550) in the thickness direction of another retardation layer is preferably ⁇ 50 nm to ⁇ 300 nm, more preferably ⁇ 70 nm to ⁇ 250 nm, further preferably ⁇ 90 nm to ⁇ 200 nm, and particularly preferably ⁇ It is 100 nm to -180 nm.
  • the another retardation layer preferably comprises a film containing a liquid crystal material fixed in homeotropic alignment.
  • the liquid crystal material (liquid crystal compound) capable of homeotropic alignment may be a liquid crystal monomer or a liquid crystal polymer.
  • Specific examples of the method of forming the liquid crystal compound and the retardation layer include the liquid crystal compound and the method of forming the retardation layer described in JP-A No. 2002-333642, [0020] to [0028].
  • the thickness of another retardation layer is preferably 0.5 ⁇ m to 10 ⁇ m, more preferably 0.5 ⁇ m to 8 ⁇ m, and further preferably 0.5 ⁇ m to 5 ⁇ m.
  • the conductive layer is formed by any appropriate base material by any suitable film forming method (eg, vacuum deposition method, sputtering method, CVD method, ion plating method, spray method, etc.). It may be formed by depositing a metal oxide film thereon.
  • suitable film forming method eg, vacuum deposition method, sputtering method, CVD method, ion plating method, spray method, etc.
  • the metal oxide include indium oxide, tin oxide, zinc oxide, indium-tin composite oxide, tin-antimony composite oxide, zinc-aluminum composite oxide, and indium-zinc composite oxide. Of these, indium-tin composite oxide (ITO) is preferable.
  • the thickness of the conductive layer is preferably 50 nm or less, more preferably 35 nm or less.
  • the lower limit of the thickness of the conductive layer is preferably 10 nm.
  • the conductive layer may be transferred from the above base material to the retardation layer (or another retardation layer if present) and the conductive layer may be the constituent layer of the polarizing plate with the retardation layer alone. It may be laminated on the retardation layer (or another retardation layer when present) as a laminate (substrate with conductive layer).
  • the base material is optically isotropic, and therefore the conductive layer can be used as the isotropic base material with a conductive layer in a polarizing plate with a retardation layer.
  • any suitable isotropic base material can be adopted.
  • the material forming the isotropic base material include materials having a resin having no conjugated system such as norbornene-based resin and olefin-based resin as a main skeleton, and cyclic structures such as lactone ring and glutarimide ring of acrylic resin. The material etc. which have in a main chain are mentioned. When such a material is used, it is possible to suppress the development of retardation due to the orientation of the molecular chains when forming the isotropic substrate.
  • the thickness of the isotropic substrate is preferably 50 ⁇ m or less, more preferably 35 ⁇ m or less.
  • the lower limit of the thickness of the isotropic substrate is, for example, 20 ⁇ m.
  • the conductive layer and/or the conductive layer of the isotropic substrate with the conductive layer may be patterned as required. By patterning, conductive parts and insulating parts can be formed. As a result, electrodes can be formed.
  • the electrodes may function as touch sensor electrodes that sense a touch on the touch panel. Any appropriate method can be adopted as the patterning method. Specific examples of the patterning method include a wet etching method and a screen printing method.
  • the present invention includes an image display device using such a polarizing plate with a retardation layer.
  • Typical examples of the image display device include a liquid crystal display device and an electroluminescence (EL) display device (for example, an organic EL display device, an inorganic EL display device (for example, a quantum dot display device)).
  • the image display device according to the embodiment of the present invention includes the polarizing plate with a retardation layer described in the items A to F on the viewing side.
  • the retardation layer-attached polarizing plate is laminated such that the retardation layer is on the image display cell (for example, liquid crystal cell, organic EL cell, inorganic EL cell) side (the polarizer is on the viewing side).
  • the image display device has a curved shape (substantially a curved display screen) and/or is bendable or foldable. In such an image display device, the effect of the polarizing plate with a retardation layer of the present invention becomes remarkable.
  • Example 1 Preparation of Polarizing Plate A-PET (amorphous-polyethylene terephthalate) film (manufactured by Mitsubishi Plastics, Inc., trade name: Novaclear SH046, thickness 200 ⁇ m) was prepared as a base material, and corona treatment (58 W/m 2 /min) was applied to the surface. did. On the other hand, 1 wt% of acetoacetyl-modified PVA (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name: Gocefimer Z200, polymerization degree 1200, saponification degree 99.0% or more, acetoacetyl modification degree 4.6%) was added.
  • PVA acetoacetyl-modified PVA
  • PVA polymerization degree 4200, saponification degree 99.2%
  • a laminate having a PVA-based resin layer provided on the material was produced.
  • this laminate was first stretched in air at 130° C. to 2.0 times to obtain a stretched laminate.
  • the boric acid insolubilized aqueous solution in this step had a boric acid content of 3% by weight with respect to 100% by weight of water.
  • a colored laminate was produced by dyeing this stretched laminate.
  • the colored laminate is obtained by immersing the stretched laminate in a dyeing solution containing iodine and potassium iodide at a liquid temperature of 30° C. to adsorb iodine to the PVA-based resin layer contained in the stretched laminate.
  • the iodine concentration and the immersion time were adjusted so that the obtained polarizer had a single transmittance of 44.5%.
  • the dyeing solution used water as a solvent and had an iodine concentration in the range of 0.08 to 0.25% by weight and a potassium iodide concentration in the range of 0.56 to 1.75% by weight. ..
  • the ratio of the concentrations of iodine and potassium iodide was 1:7.
  • a step of subjecting the PVA molecules of the PVA-based resin layer having adsorbed iodine to a crosslinking treatment by immersing the colored laminate in a boric acid crosslinking aqueous solution at 30° C. for 60 seconds was performed.
  • the boric acid cross-linking aqueous solution in this step had a boric acid content of 3% by weight with respect to 100% by weight of water, and a potassium iodide content of 3% by weight with respect to 100% by weight of water. Furthermore, the obtained colored laminate was stretched in a boric acid aqueous solution at a stretching temperature of 70° C. in the same direction as in the above-mentioned stretching in the air by a factor of 2.7 to give a final stretching ratio of 5.4. As a doubling, a substrate/polarizer laminate was obtained. The thickness of the polarizer was 5 ⁇ m.
  • the boric acid cross-linking aqueous solution in this step had a boric acid content of 6.5 wt% with respect to 100 wt% of water, and a potassium iodide content of 5 wt% with respect to 100 wt% of water.
  • the obtained laminate was taken out from the aqueous boric acid solution, and the boric acid adhering to the surface of the polarizer was washed with an aqueous solution having a potassium iodide content of 2% by weight with respect to 100% by weight of water.
  • the washed laminate was dried with hot air at 60°C.
  • a 40 ⁇ m thick triacetyl cellulose (TAC) film was attached to the polarizer surface of the substrate/polarizer laminate obtained above through a PVA-based adhesive to form a protective layer (TAC film)/polarizer.
  • a laminate having a structure of /resin base material was obtained. Further, the resin base material is peeled from this laminate, and a TAC film having a thickness of 40 ⁇ m is attached to the peeled surface, and a laminate having a structure of protective layer (TAC film)/polarizer/protective layer (TAC film) ( A polarizing plate) was obtained.
  • the direction of the alignment treatment was set to be 45° with respect to the direction of the absorption axis of the polarizer when it was attached to the polarizing plate, as viewed from the viewing side.
  • the liquid crystal coating solution was applied to the surface of this alignment treatment by a bar coater, and the liquid crystal compound was aligned by heating and drying at 90° C. for 2 minutes.
  • the liquid crystal layer thus formed was irradiated with light of 1 mJ/cm 2 using a metal halide lamp to cure the liquid crystal layer, thereby forming a liquid crystal alignment solidified layer A on the PET film.
  • FIG. 4 shows a TEM image showing the state of the interface between the adhesive layer and the retardation layer (liquid crystal alignment solidified layer A).
  • the obtained polarizing plate with a retardation layer was evaluated for releasability. Specifically, it is as follows.
  • the obtained polarizing plate with a retardation layer was cut into a size of 200 mm parallel to the absorption axis direction of the polarizer and 15 mm in the orthogonal direction and attached to a glass plate.
  • a peeling test was performed in a 90° direction at a peeling speed of 300 mm/min using a Tensilon universal testing machine RTC manufactured by A&D Co., Ltd., and the peel strength at that time was measured. In the peeling test, peeling occurred at the interface between the TAC film and the adhesive layer, and the peeling strength was 0.8 N/15 mm.
  • a protective layer (TAC film)/polarizer/polarizer/polarizer/ A polarizing plate with a retardation layer having a structure of protective layer (COP film)/adhesive layer (adhesive A)/retardation layer (liquid crystal alignment fixed layer A, ⁇ /4 plate, slow axis 45° direction) is obtained. It was When the cross section of the obtained polarizing plate with a retardation layer was observed with a transmission electron microscope (TEM), a permeation layer formed by permeation of the adhesive A into the retardation layer (liquid crystal alignment fixed layer A) was confirmed.
  • TEM transmission electron microscope
  • Example 3 In the manufacture of a polarizing plate, a protective layer (TAC film)/polarizer/protective layer (acryl) was prepared in the same manner as in Example 1 except that an acrylic resin film was bonded to the release surface of the resin substrate instead of the TAC film.
  • a polarizing plate with a retardation layer having a constitution of (film)/adhesive layer (adhesive A)/retardation layer (liquid crystal alignment fixed layer A, ⁇ /4 plate, slow axis 45° direction) was obtained.
  • Example 4 A protective layer (TAC film)/polarizer/adhesive layer (adhesive A)/retardation was obtained in the same manner as in Example 1 except that the protective layer was not provided on the release surface of the resin substrate in the production of the polarizing plate.
  • a polarizing plate with a retardation layer having a constitution of layers (liquid crystal alignment fixed layer A, ⁇ /4 plate, slow axis direction of 45°) was obtained.
  • TEM transmission electron microscope
  • a permeation layer formed by permeation of the adhesive A into the retardation layer (liquid crystal alignment fixed layer A) was confirmed. It was Further, the releasability of the obtained polarizing plate with a retardation layer was evaluated in the same manner as in Example 1. No peeling occurred in the peeling test.
  • Example 5 A polarizing plate having a structure of protective layer (TAC film)/polarizer was obtained in the same manner as in Example 4. Here, the coating thickness was changed, and the alignment treatment was performed in the same manner as in Example 1 except that it was oriented at 15° with respect to the direction of the absorption axis of the polarizer when viewed from the viewing side. , A liquid crystal alignment fixed layer B was formed on the PET film. The thickness of the liquid crystal alignment fixed layer B was 2.5 ⁇ m, and the in-plane retardation Re(550) was 270 nm.
  • the liquid crystal alignment solidified layer B is transferred to the polarizer surface of the polarizing plate via the adhesive A (thickness after curing of 1.0 ⁇ m), and the alignment treatment direction is further viewed on the viewing side with respect to the absorption axis direction of the polarizer.
  • the liquid crystal alignment/solidification layer B prepared in the same manner as in Example 1 except that the direction was 75° as viewed from above, with the liquid crystal alignment/solidification layer B through the adhesive A (thickness after curing of 1.0 ⁇ m). Transferred to the surface of.
  • TAC film protective layer
  • the releasability of the obtained polarizing plate with a retardation layer was evaluated in the same manner as in Example 1.
  • the adhesive layer between the liquid crystal alignment solidified layer A and the liquid crystal alignment solidified layer B was cohesively broken.
  • the releasability of the obtained polarizing plate with a retardation layer was evaluated in the same manner as in Example 1.
  • peeling occurred at the interface between the liquid crystal alignment fixed layer A and the adhesive layer, and the peeling strength was 0.5 N/15 mm.
  • the example of the present invention can suppress peeling of the liquid crystal alignment/solidification layer.
  • the polarizing plate with a retardation layer of the present invention is suitably used as a circular polarizing plate for liquid crystal display devices, organic EL display devices and inorganic EL display devices.
  • Polarizing Plate 11 Polarizer 12 First Protective Layer 13 Second Protective Layer 20 Retardation Layer 20a Penetration Layer 21 First Alignment Solidification Layer 21a Penetration Layer 22 Second Orientation Solidification Layer 22a Penetration Layer 31 First Adhesion Agent layer 32 Second adhesive layer 100 Polarizing plate with retardation layer 101 Polarizing plate with retardation layer 102 Polarizing plate with retardation layer

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