WO2018066199A1 - Stratifié optique et dispositif d'affichage d'image - Google Patents

Stratifié optique et dispositif d'affichage d'image Download PDF

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Publication number
WO2018066199A1
WO2018066199A1 PCT/JP2017/025528 JP2017025528W WO2018066199A1 WO 2018066199 A1 WO2018066199 A1 WO 2018066199A1 JP 2017025528 W JP2017025528 W JP 2017025528W WO 2018066199 A1 WO2018066199 A1 WO 2018066199A1
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layer
retardation layer
retardation
film
liquid crystal
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PCT/JP2017/025528
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English (en)
Japanese (ja)
Inventor
明憲 西村
丈治 喜多川
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日東電工株式会社
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Priority to CN201780061146.9A priority Critical patent/CN109791246B/zh
Priority to KR1020197008826A priority patent/KR101978802B1/ko
Publication of WO2018066199A1 publication Critical patent/WO2018066199A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B23/00—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose
    • B32B23/04—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B23/08—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B23/00—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose
    • B32B23/20—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising esters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/325—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polycycloolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/20—Inorganic coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/55—Liquid crystals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/42—Polarizing, birefringent, filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7246—Water vapor barrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B32B2307/734—Dimensional stability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • 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

Definitions

  • the present invention relates to an optical laminate and an image display device using the same.
  • the polarizing plate (or circularly polarizing plate) for the inner touch panel type input display device the polarizing plate (or circularly polarizing plate) and the conductivity for the touch sensor are used from the viewpoints of thinning, prevention of variation in quality, and improvement of manufacturing efficiency. Integration with film is under consideration.
  • the polarizing plate in which the conductive film for the touch sensor is integrated has a problem that cracks are easily generated in the conductive layer of the conductive film under high temperature and high humidity.
  • the present invention has been made to solve the above-described conventional problems, and a main object thereof is to provide an optical laminate in which cracking of a conductive layer under high temperature and high humidity is suppressed.
  • the optical layered body of the present invention includes a polarizer, a polarizing plate including a protective layer on at least one side of the polarizer, a first retardation layer, a second retardation layer, a conductive layer, And a base material closely laminated on the conductive layer in this order.
  • the substrate has a moisture permeability of 5 mg / m 2 ⁇ 24 h to 10 mg / m 2 ⁇ 24 h, a dimensional change rate of 0.3% or less, and a linear expansion coefficient of 5 ( ⁇ 10 ⁇ 6 / ° C.) to 10 ( ⁇ 10 ⁇ 6 / ° C.).
  • the angle formed by the absorption axis of the polarizer and the slow axis of the first retardation layer is 10 ° to 20 °, and the absorption axis and the second retardation layer are The angle formed with the slow axis is 65 ° to 85 °.
  • the 1st phase contrast layer and the 2nd phase contrast layer are constituted by cyclic olefin system resin film.
  • the dimensional change rate of the second retardation layer is, for example, 1% or less.
  • the first retardation layer and the second retardation layer are alignment solidified layers of a liquid crystal compound.
  • an image display device includes the optical laminate described above.
  • the moisture permeability, dimensional change rate, and linear expansion coefficient of the substrate laminated in close contact with the conductive layer are optimized.
  • the occurrence of cracks in the conductive layer under high temperature and high humidity can be significantly suppressed.
  • Refractive index (nx, ny, nz) “Nx” is the refractive index in the direction in which the in-plane refractive index is maximum (ie, the slow axis direction), and “ny” is the direction orthogonal to the slow axis in the plane (ie, the fast axis direction). “Nz” is the refractive index in the thickness direction.
  • Refractive index (nx, ny, nz) “Nx” is the refractive index in the direction in which the in-plane refractive index is maximum (ie, the slow axis direction), and “ny” is the direction orthogonal to the slow axis in the plane (ie, 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.
  • Thickness direction retardation (Rth) is a retardation in the thickness direction measured with light having a wavelength of ⁇ nm at 23 ° C.
  • Rth (550) is a retardation in the thickness direction measured with light having a wavelength of 550 nm at 23 ° C.
  • FIG. 1 is a schematic cross-sectional view of an optical laminate according to one embodiment of the present invention.
  • the optical laminated body 100 of this embodiment has the polarizing plate 10, the 1st phase difference layer 20, the 2nd phase difference layer 30, the conductive layer 41, and the base material 42 in this order.
  • the polarizing plate 10 includes a polarizer 11, a first protective layer 12 disposed on one side of the polarizer 11, and a second protective layer 13 disposed on the other side of the polarizer 11. .
  • one of the first protective layer 12 and the second protective layer 13 may be omitted.
  • the first retardation layer 20 can also function as a protective layer for the polarizer 11
  • the second protective layer 13 may be omitted.
  • the base material 42 is closely adhered to the conductive layer 41.
  • adhered to the conductive layer 41 “adhesion lamination” means that two layers are directly and firmly laminated without an adhesive layer (for example, an adhesive layer or an adhesive layer).
  • Each of the conductive layer 41 and the base material 42 may be a component of the optical laminate 100 as a single layer, or may be introduced into the optical laminate 100 as a laminate of the base material 42 and the conductive layer 41.
  • the ratio of the thickness of each layer in drawing differs from actual.
  • the moisture permeability of the base material 42 is 5 mg / m 2 ⁇ 24 h to 10 mg / m 2 ⁇ 24 h, preferably 6 mg / m 2 ⁇ 24 h to 9 mg / m 2 ⁇ 24 h, More preferably, it is 7 mg / m 2 ⁇ 24 h to 8 mg / m 2 ⁇ 24 h.
  • the dimensional change rate of the base material 42 is 0.3% or less, preferably 0.1% or less, and more preferably 0.05% or less.
  • the linear expansion coefficient of the base material 42 is 5 ( ⁇ 10 ⁇ 6 / ° C.) to 10 ( ⁇ 10 ⁇ 6 / ° C.), preferably 6 ( ⁇ 10 ⁇ 6 / ° C.) to 9 ( ⁇ 10 ⁇ 6 / ° C.), more preferably 7 ( ⁇ 10 ⁇ 6 / ° C.) to 8 ( ⁇ 10 ⁇ 6 / ° C.).
  • the moisture permeability can be determined based on the moisture permeability test (cup method) of JIS Z0208.
  • the dimensional change rate refers to the dimensional change rate when placed in an environment of a temperature of 85 ° C. and a relative humidity of 85% for 240 hours.
  • the linear expansion coefficient can be determined by TMA measurement according to JIS K 7197.
  • first retardation layer 20 and the second retardation layer 30 are each made of a resin film.
  • first retardation layer 20 and the second retardation layer 30 may each be an alignment solidified layer of a liquid crystal compound.
  • the resin film will be described in detail in the sections C-2 and D-2, and the alignment solidified layer of the liquid crystal compound will be described in detail in the sections C-3 and D-3.
  • Each layer constituting the optical laminate other than the adhesion lamination of the conductive layer 41 and the substrate 42 may be laminated via any appropriate adhesive layer (adhesive layer or pressure-sensitive adhesive layer: not shown).
  • adhesive layer adhesive layer or pressure-sensitive adhesive layer: not shown.
  • they may be closely stacked.
  • the optical layered body preferably has a dimensional change rate of 1% or less, more preferably 0.95% or less.
  • the lower limit of the dimensional change rate of the optical laminated body is, for example, 0.01%. If the dimensional change rate of the optical laminate is in such a range, the occurrence of cracks in the conductive layer under high temperature and high humidity can be remarkably suppressed.
  • the total thickness of the optical laminated body is preferably 220 ⁇ m or less, more preferably 80 ⁇ m to 190 ⁇ m.
  • the total thickness of the optical laminate is preferably 175 ⁇ m or less, more preferably 80 ⁇ m to 140 ⁇ m. is there.
  • the optical layered body may have a long shape (for example, a roll shape) or a single wafer shape.
  • Polarizing plate B-1 Polarizer Any appropriate polarizer may 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.
  • polarizers composed of a single-layer resin film include hydrophilic polymer films such as polyvinyl alcohol (PVA) films, partially formalized PVA films, and ethylene / vinyl acetate copolymer partially saponified films.
  • PVA polyvinyl alcohol
  • polyene-based oriented films such as those subjected to dyeing treatment and stretching treatment with dichroic substances such as iodine and dichroic dyes, PVA dehydrated products and polyvinyl chloride dehydrochlorinated products.
  • a polarizer obtained by dyeing a PVA film with iodine and uniaxially stretching is used because of excellent optical properties.
  • the dyeing with iodine is performed, for example, by immersing a PVA film in an aqueous iodine solution.
  • the stretching ratio of the uniaxial stretching is preferably 3 to 7 times.
  • the stretching may be performed after the dyeing treatment or may be performed while dyeing. Moreover, you may dye
  • the PVA film is subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment and the like. For example, by immersing the PVA film in water and washing it before dyeing, not only can the surface of the PVA film be cleaned of dirt and anti-blocking agents, but the PVA film can be swollen to cause uneven staining. Can be prevented.
  • a polarizer obtained by using a laminate a laminate of a resin substrate and a PVA resin layer (PVA resin film) laminated on the resin substrate, or a resin substrate and the resin
  • a polarizer obtained by using a laminate with a PVA resin layer applied and formed on a substrate examples thereof include a polarizer obtained by using a laminate with a PVA resin layer applied and formed on a substrate.
  • a polarizer obtained by using a laminate of a resin base material and a PVA resin layer applied and formed on the resin base material may be obtained by, for example, applying a PVA resin solution to a resin base material and drying it.
  • 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 make the PVA-based resin layer a polarizer; obtain.
  • stretching typically includes immersing the laminate in an aqueous boric acid solution and stretching. Further, the stretching may further include, if necessary, stretching the laminate in the air at a high temperature (for example, 95 ° C. or higher) before stretching in the boric acid aqueous solution.
  • the obtained resin base material / polarizer laminate may be used as it is (that is, the resin base material may be used as a protective layer of the polarizer), and the resin base material is peeled from the resin base material / polarizer laminate.
  • Any appropriate protective layer according to the purpose may be laminated on the release surface. Details of a method for manufacturing such a polarizer are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580. This publication is incorporated herein by reference in its entirety.
  • the thickness of the polarizer is preferably 18 ⁇ m or less, more preferably 1 ⁇ m to 12 ⁇ m, still more preferably 3 ⁇ m to 12 ⁇ m, and particularly preferably 5 ⁇ m to 12 ⁇ m.
  • the boric acid content of the polarizer is preferably 18% by weight or more, more preferably 18% by weight to 25% by weight. If the content of boric acid in the polarizer is in such a range, the ease of curling adjustment at the time of bonding is well maintained and the curling at the time of heating is achieved by a synergistic effect with the iodine content described later. It is possible to improve the appearance durability during heating while satisfactorily suppressing.
  • the boric acid content can be calculated as the amount of boric acid contained in the polarizer per unit weight using, for example, the following formula from the neutralization method.
  • the iodine content of the polarizer is preferably 2.1% by weight or more, more preferably 2.1% by weight to 3.5% by weight. If the iodine content of the polarizer is in this range, the curl adjustment at the time of bonding is well maintained and the curl at the time of heating is maintained by a synergistic effect with the boric acid content. It is possible to improve the appearance durability during heating while satisfactorily suppressing.
  • iodine content means the amount of all iodine contained in a polarizer (PVA resin film).
  • iodine exists in the form of iodine ions (I ⁇ ), iodine molecules (I 2 ), polyiodine ions (I 3 ⁇ , I 5 ⁇ ), etc. in the polarizer.
  • Iodine content means the amount of iodine encompassing all these forms.
  • the iodine content can be calculated, for example, by a calibration curve method of fluorescent X-ray analysis.
  • the polyiodine ion exists in a state where a PVA-iodine complex is formed in the polarizer. By forming such a complex, absorption dichroism can be developed in the wavelength range of visible light.
  • the complex of PVA and triiodide ions (PVA ⁇ I 3 ⁇ ) has an absorption peak around 470 nm, and the complex of PVA and pentaiodide ions (PVA ⁇ I 5 ⁇ ) is around 600 nm. Have an absorption peak.
  • polyiodine ions can absorb light in a wide range of visible light depending on their form.
  • iodine ion (I ⁇ ) has an absorption peak near 230 nm and is not substantially involved in the absorption of visible light. Therefore, polyiodine ions present in a complex state with PVA can be mainly involved in the absorption performance of the polarizer.
  • the polarizer preferably exhibits absorption dichroism at any wavelength between 380 nm and 780 nm.
  • the single transmittance of the polarizer is 43.0% to 46.0%, 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 is formed of any suitable film that can be used as a protective layer for a polarizer.
  • the material as the main component of the film include cellulose resins such as triacetyl cellulose (TAC), polyester-based, polyvinyl alcohol-based, polycarbonate-based, polyamide-based, polyimide-based, polyethersulfone-based, and polysulfone-based materials.
  • transparent resins such as polystyrene, polynorbornene, polyolefin, (meth) acryl, and acetate.
  • thermosetting resins such as (meth) acrylic, urethane-based, (meth) acrylurethane-based, epoxy-based, and silicone-based or ultraviolet curable resins are also included.
  • a glassy polymer such as a siloxane polymer is also included.
  • a polymer film described in JP-A-2001-343529 (WO01 / 37007) can also be used.
  • a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in the side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and nitrile group in the side chain for example, a resin composition having an alternating copolymer of isobutene and N-methylmaleimide and an acrylonitrile / styrene copolymer can be mentioned.
  • the polymer film can be, for example, an extruded product of the resin composition.
  • the optical layered body of the present invention 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. Therefore, the first protective layer 12 may be subjected to a surface treatment such as a hard coat treatment, an antireflection treatment, an antisticking treatment, and an antiglare treatment as necessary. Further / or, if necessary, the first protective layer 12 is provided with a treatment for improving visibility when viewed through polarized sunglasses (typically, imparting an (elliptical) circular polarization function, (Giving an ultrahigh phase difference) may be applied. By performing such processing, excellent visibility can be achieved even when the display screen is viewed through a polarizing lens such as polarized sunglasses. Therefore, the optical laminate can be suitably applied to an image display device that can be used outdoors.
  • polarized sunglasses typically, imparting an (elliptical) circular polarization function, (Giving an ultrahigh phase difference
  • the thickness of the first protective layer any appropriate thickness can be adopted as long as the difference between the thickness of the desired polarizing plate and the thickness of the second protective layer can be obtained.
  • the thickness of the first protective layer is, for example, 10 ⁇ m to 50 ⁇ m, preferably 15 ⁇ m to 40 ⁇ m.
  • the thickness of the first protective layer is a thickness including the thickness of the surface treatment layer.
  • the second protective layer 13 is also formed of any suitable film that can be used as a protective layer for the polarizer.
  • the material constituting the main component of the film is as described in the section B-2 regarding the first protective layer.
  • the second protective layer 13 is 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 thickness of the second protective layer is, for example, 15 ⁇ m to 35 ⁇ m, preferably 20 ⁇ m to 30 ⁇ m.
  • the difference between the thickness of the first protective layer and the thickness of the second protective layer is preferably 15 ⁇ m or less, more preferably 10 ⁇ m or less. If the difference in thickness is within such a range, curling at the time of bonding can be satisfactorily suppressed.
  • the thickness of the first protective layer and the thickness of the second protective layer may be the same, the first protective layer may be thicker, and the second protective layer may be thicker. . Typically, the first protective layer is thicker than the second protective layer.
  • the first retardation layer 20 may have any appropriate optical and / or mechanical characteristics depending on the purpose.
  • the first retardation layer 20 typically has a slow axis.
  • the angle formed by the slow axis of the first retardation layer 20 and the absorption axis of the polarizer 11 is preferably 10 ° to 20 °, more preferably 13 ° to 17 °. More preferably about 15 °. If the angle formed by the slow axis of the first retardation layer 20 and the absorption axis of the polarizer 11 is within such a range, the surfaces of the first retardation layer and the second retardation layer will be described later.
  • the circular polarization characteristics excellent in a wide band ( As a result, an optical laminate having very excellent antireflection properties can be obtained.
  • the first retardation layer preferably has a relationship in which the refractive index characteristic is nx> ny ⁇ nz.
  • the in-plane retardation Re (550) of the first retardation layer is preferably 180 nm to 320 nm, more preferably 200 nm to 290 nm, and further preferably 230 nm to 280 nm.
  • the Nz coefficient of the first retardation layer is preferably 0.9 to 3, more preferably 0.9 to 2.5, still more preferably 0.9 to 1.5, and particularly preferably 0.9 to 1. 3. By satisfying such a relationship, a very excellent reflection hue can be achieved when the obtained optical laminate is used in an image display device.
  • the first retardation layer may exhibit a reverse dispersion wavelength characteristic in which the retardation value increases according to the wavelength of the measurement light, and has a positive chromatic dispersion characteristic in which the retardation value decreases according to the wavelength of the measurement light. It may also be possible to show a flat chromatic dispersion characteristic in which the phase difference value hardly changes depending on the wavelength of the measurement light. In one embodiment, the first retardation layer exhibits a flat wavelength dispersion characteristic in which the retardation value hardly changes depending on the wavelength of the measurement light.
  • Re (450) / Re (550) of the retardation layer is preferably from 0.99 to 1.03
  • Re (650) / Re (550) is preferably from 0.98 to 1.02. is there.
  • a first retardation layer having a flat chromatic dispersion characteristic and having a predetermined in-plane retardation and a second retardation layer having a flat chromatic dispersion characteristic and having a predetermined in-plane retardation have a predetermined slow axis.
  • the absolute value of the photoelastic coefficient of the first retardation layer is preferably 2 ⁇ 10 ⁇ 11 m 2 / N or less, more preferably 2.0 ⁇ 10 ⁇ 13 m 2 / N to 1.5 ⁇ 10 ⁇ 11. m 2 / N, more preferably from 1.0 ⁇ 10 -12 m 2 /N ⁇ 1.2 ⁇ 10 -11 m 2 / N resin.
  • the thickness is preferably 60 ⁇ m or less, and preferably 30 ⁇ m to 50 ⁇ m. If the thickness of the first retardation layer is in such a range, a desired in-plane retardation can be obtained.
  • the first retardation layer 20 can be composed of any appropriate resin film that can satisfy the characteristics described in the above section C-1.
  • Typical examples of such resins include cyclic olefin resins, polycarbonate resins, cellulose resins, polyester resins, polyvinyl alcohol resins, polyamide resins, polyimide resins, polyether resins, polystyrene resins, acrylic resins. Based resins.
  • a cyclic olefin-based resin can be suitably used.
  • the cyclic olefin-based resin is a general term for resins that are polymerized using a cyclic olefin as a polymerization unit, and is described in, for example, JP-A-1-240517, JP-A-3-14882, JP-A-3-122137, and the like. Resin. Specific examples include ring-opening (co) polymers of cyclic olefins, addition polymers of cyclic olefins, copolymers of cyclic olefins and ⁇ -olefins such as ethylene and propylene (typically random copolymers).
  • graft modified products in which these are modified with an unsaturated carboxylic acid or a derivative thereof, and hydrides thereof.
  • the cyclic olefin include norbornene monomers.
  • the norbornene-based monomer include norbornene and alkyl and / or alkylidene substituted products thereof such as 5-methyl-2-norbornene, 5-dimethyl-2-norbornene, 5-ethyl-2-norbornene, 5-butyl- 2-Norbornene, 5-ethylidene-2-norbornene, etc.
  • Polar group substitution products such as halogens; dicyclopentadiene, 2,3-dihydrodicyclopentadiene, etc .; dimethanooctahydronaphthalene, alkyl and / or alkylidene substitution thereof
  • polar group substituents such as halogen, for example, 6-methyl-1,4: 5,8-dimethano-1,4,4a, 5,6,7,8,8a-octahydronaphthalene, 6-ethyl -1,4: 5,8-dimethano-1,4,4a, 5,6,7,8,8a-octahi Lonaphthalene, 6-ethylidene-1,4: 5,8-dimethano-1,4,4a, 5,6,7,8,8a-octahydronaphthalene, 6-chloro-1,4: 5,8-dimethano -1,4,4a, 5,6,7,8,8a-octahydronaphthalene, 6-cyano
  • cycloolefins capable of ring-opening polymerization can be used in combination as long as the object of the present invention is not impaired.
  • cycloolefins include compounds having one reactive double bond such as cyclopentene, cyclooctene, and 5,6-dihydrodicyclopentadiene.
  • the cyclic olefin resin preferably has a number average molecular weight (Mn) measured by a gel permeation chromatograph (GPC) method using a toluene solvent, preferably 25,000 to 200,000, more preferably 30,000 to 100,000. 000, most preferably 40,000 to 80,000.
  • Mn number average molecular weight measured by a gel permeation chromatograph (GPC) method using a toluene solvent, preferably 25,000 to 200,000, more preferably 30,000 to 100,000. 000, most preferably 40,000 to 80,000.
  • the hydrogenation rate is preferably 90% or more, more preferably 95% or more, Most preferably, it is 99% or more. Within such a range, the heat deterioration resistance and light deterioration resistance are excellent.
  • a commercially available film may be used as the cyclic olefin resin film.
  • Specific examples include trade names “ZEONEX” and “ZEONOR” manufactured by ZEON CORPORATION, “Arton” manufactured by JSR, “TOPAS” trade name manufactured by TICONA, and trade names manufactured by Mitsui Chemicals, Inc. “APEL” may be mentioned.
  • the first retardation layer 20 is obtained, for example, by stretching a film formed from the above cyclic olefin resin.
  • Any appropriate molding method can be adopted as a method of forming a film from a cyclic olefin-based resin. Specific examples include compression molding methods, transfer molding methods, injection molding methods, extrusion molding methods, blow molding methods, powder molding methods, FRP molding methods, cast coating methods (for example, casting methods), calendar molding methods, and hot presses. Law. Extrusion molding or cast coating is preferred. This is because the smoothness of the resulting film can be improved and good optical uniformity can be obtained.
  • the molding conditions can be appropriately set according to the composition and type of the resin used, the properties desired for the retardation layer, and the like. In addition, as above-mentioned, since many film products are marketed for cyclic olefin resin, you may use the said commercial film for an extending
  • the thickness of the resin film can be set to any appropriate value depending on the desired thickness of the first retardation layer, the desired optical properties, the stretching conditions described below, and the like.
  • the thickness is preferably 50 ⁇ m to 300 ⁇ m.
  • Any appropriate stretching method and stretching conditions may be employed for the stretching.
  • various stretching methods such as free end stretching, fixed end stretching, free end contraction, and fixed end contraction can be used singly or simultaneously or sequentially.
  • the stretching direction can also be performed in various directions and dimensions such as a length direction, a width direction, a thickness direction, and an oblique direction.
  • the stretching temperature is preferably Tg-30 ° C. to Tg + 60 ° C., more preferably Tg-10 ° C. to Tg + 50 ° C. with respect to the glass transition temperature (Tg) of the resin film.
  • a retardation film having the desired optical characteristics (for example, refractive index characteristics, in-plane retardation, Nz coefficient) can be obtained by appropriately selecting the stretching method and stretching conditions.
  • the retardation film is produced by uniaxially stretching a resin film or uniaxially stretching a fixed end.
  • the fixed end uniaxial stretching there is a method of stretching in the width direction (lateral direction) while running the resin film in the longitudinal direction.
  • the draw ratio is preferably 1.1 to 3.5 times.
  • the retardation film can be produced by continuously stretching a long resin film obliquely in a direction at a predetermined angle with respect to the longitudinal direction.
  • a long stretched film having an orientation angle of a predetermined angle with respect to the longitudinal direction of the film (slow axis in the direction of the angle) can be obtained.
  • lamination with a polarizer At this time, roll-to-roll is possible, and the manufacturing process can be simplified.
  • the angle may be an angle formed between the absorption axis of the polarizer and the slow axis of the first retardation layer in the optical layered body. As described above, the angle is preferably 10 ° to 20 °, more preferably 13 ° to 17 °, and further preferably about 15 °.
  • Examples of the stretching machine used for the oblique stretching include a tenter type stretching machine capable of adding feed forces, pulling forces, or pulling forces at different speeds in the lateral and / or longitudinal directions.
  • the tenter type stretching machine includes a horizontal uniaxial stretching machine, a simultaneous biaxial stretching machine, and the like, but any suitable stretching machine can be used as long as a long resin film can be continuously stretched obliquely.
  • the first retardation layer substantially having the desired in-plane retardation and having the slow axis in the desired direction.
  • a long retardation film can be obtained.
  • the stretching temperature of the film can vary depending on the in-plane retardation value and thickness desired for the first retardation layer, the type of resin used, the thickness of the film used, the stretching ratio, and the like. Specifically, the stretching temperature is preferably Tg-30 ° C to Tg + 30 ° C, more preferably Tg-15 ° C to Tg + 15 ° C, and most preferably Tg-10 ° C to Tg + 10 ° C. By extending
  • the first retardation layer 20 may be a liquid crystal compound alignment solidified layer.
  • the difference between nx and ny of the obtained retardation layer can be remarkably increased as compared with the non-liquid crystal material. Therefore, the first retardation for obtaining a desired in-plane retardation is obtained.
  • the thickness of the layer can be significantly reduced. As a result, the optical laminate can be further reduced in thickness.
  • the first retardation layer 20 is composed of an alignment solidified layer of a liquid crystal compound, the thickness is preferably 1 ⁇ m to 7 ⁇ m, more preferably 1.5 ⁇ m to 2.5 ⁇ m.
  • the “alignment solidified layer” refers to a layer in which a liquid crystal compound is aligned in a predetermined direction in the layer and the alignment state is fixed.
  • the “alignment solidified layer” is a concept including an alignment cured layer obtained by curing a liquid crystal monomer as described later.
  • rod-like liquid crystal compounds are aligned in a state where they are aligned in the slow axis direction of the first retardation layer (homogeneous alignment).
  • the liquid crystal compound include a liquid crystal compound (nematic liquid crystal) whose liquid crystal phase is a nematic phase.
  • a liquid crystal compound for example, a liquid crystal polymer or a liquid crystal monomer can be used.
  • the liquid crystal compound may exhibit liquid crystallinity either 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. This is because the alignment state of the liquid crystal monomer can be fixed by polymerizing or crosslinking (that is, curing) the liquid crystal monomer. After aligning the liquid crystal monomers, for example, if the liquid crystal monomers are polymerized or cross-linked, the alignment state can be fixed thereby.
  • a polymer is formed by polymerization and a three-dimensional network structure is formed by crosslinking, but these are non-liquid crystalline.
  • the first retardation layer for example, transition to a liquid crystal phase, a glass phase, or a crystal phase due to a temperature change specific to the liquid crystal compound does not occur.
  • the first retardation layer is an extremely stable retardation layer that is not affected by temperature changes.
  • the temperature range in which the liquid crystal monomer exhibits liquid crystal properties 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.
  • liquid crystal monomer any appropriate liquid crystal monomer can be adopted as the liquid crystal monomer.
  • the polymerizable mesogenic compounds described in JP-T-2002-533742 WO00 / 37585
  • EP358208 US521118)
  • EP66137 US4388453
  • WO93 / 22397 EP0266172
  • DE195504224 DE44081171
  • GB2280445 Specific examples of such a polymerizable mesogenic compound include, for example, 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 solidified layer of the liquid crystal compound is subjected to an alignment treatment on the surface of a predetermined substrate, and a coating liquid containing the 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 alignment state.
  • the liquid crystal compound can be aligned in a predetermined direction with respect to the long direction of the long substrate, and as a result, the liquid crystal compound is delayed in the predetermined direction of the formed retardation layer.
  • a phase axis can be developed. For example, a retardation layer having a slow axis in a direction of 15 ° with respect to the longitudinal direction can be formed on a long substrate.
  • Such a retardation layer can be laminated using roll-to-roll even when it is desired to have a slow axis in an oblique direction, so the productivity of the optical laminate is greatly improved.
  • the substrate is any suitable resin film, and the alignment solidified 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 is omitted, and the lamination can be performed by roll-to-roll continuously from the formation of the alignment solidified layer (first retardation layer), so that the productivity is further improved.
  • any appropriate alignment treatment can be adopted as the alignment treatment.
  • a mechanical alignment process, a physical alignment process, and a chemical alignment process are mentioned.
  • Specific examples of the mechanical alignment treatment include rubbing treatment and stretching treatment.
  • Specific examples of the physical alignment process include a magnetic field alignment process and an electric field alignment process.
  • Specific examples of the chemical alignment treatment include oblique vapor deposition and photo-alignment treatment.
  • Arbitrary appropriate conditions may be employ
  • the alignment of the liquid crystal compound is performed by processing at a temperature showing a liquid crystal phase according to the type of the liquid crystal compound.
  • the liquid crystal compound takes a liquid crystal state, and the liquid crystal compound is oriented according to the orientation treatment direction of the substrate surface.
  • the alignment state is fixed by cooling the liquid crystal compound aligned as described above.
  • 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 of forming the alignment solidified layer are described in JP-A No. 2006-163343. The description in this publication is incorporated herein by reference.
  • the second retardation layer 30 may have any appropriate optical and / or mechanical characteristics depending on the purpose.
  • the second retardation layer 30 typically has a slow axis.
  • the angle formed by the slow axis of the second retardation layer 30 and the absorption axis of the polarizer 11 is preferably 65 ° to 85 °, more preferably 72 ° to 78 °. More preferably about 75 °.
  • the angle formed by the slow axis of the second retardation layer 30 and the slow axis of the first retardation layer 20 is preferably 52 ° to 68 °, more preferably 57 ° to 63 °. More preferably, it is about 60 °.
  • the in-plane retardation of the first retardation layer is set within a predetermined range as described above.
  • the slow axis of the first retardation layer is arranged at a predetermined angle with respect to the absorption axis of the polarizer, and the in-plane retardation of the second retardation layer is set within a predetermined range as will be described later.
  • the second retardation layer preferably has a relationship of refractive index characteristics of nx> ny ⁇ nz.
  • the in-plane retardation Re (550) of the second retardation layer is preferably 80 nm to 200 nm, more preferably 100 nm to 180 nm, and still more preferably 110 nm to 170 nm.
  • the thickness is preferably 40 ⁇ m or less, and preferably 25 ⁇ m to 35 ⁇ m. If the thickness of the second retardation layer is within such a range, a desired in-plane retardation can be obtained.
  • the second retardation layer is formed of a resin film, the material, characteristics, manufacturing method, and the like are as described in the above section C-2 for the first retardation layer.
  • the second retardation layer 30 may be a liquid crystal compound alignment / solidification layer in the same manner as the first retardation layer.
  • the thickness is preferably 0.5 ⁇ m to 2 ⁇ m, more preferably 1 ⁇ m to 1.5 ⁇ m.
  • the second retardation layer is composed of an alignment solidified layer of a liquid crystal compound, the material, characteristics, manufacturing method, and the like are as described in the above section C-3 for the first retardation layer.
  • first retardation layer and the second retardation layer may be used as any appropriate combination.
  • the first retardation layer may be composed of a resin film
  • the second retardation layer may be composed of an alignment solidified layer of a liquid crystal compound; the first retardation layer is aligned and solidified of a liquid crystal compound.
  • the second retardation layer may be composed of a resin film; both the first retardation layer and the second retardation layer may be composed of a resin film; Both the phase difference layer and the second phase difference layer may be composed of an alignment solidified layer of a liquid crystal compound.
  • the second retardation layer is also composed of a resin film; the first retardation layer is composed of an alignment solidified layer of a liquid crystal compound.
  • the second retardation layer is also composed of an alignment solidified layer of a liquid crystal compound.
  • the first retardation layer and the second retardation layer may be the same, and the detailed configuration May be different. The same applies to the case where both the first retardation layer and the second retardation layer are composed of an alignment solidified layer of a liquid crystal compound.
  • the dimensional change rate of the second retardation layer is preferably 1% or less, more preferably 0.95. % Or less.
  • the lower limit of the dimensional change rate of the second retardation layer is, for example, 0.01%.
  • the dimensions of the laminate of the polarizing plate, the first retardation layer, and the second retardation layer is preferably 1% or less, more preferably 0.95% or less.
  • the lower limit of the dimensional change rate of the laminate is, for example, 0.01%.
  • the conductive layer can be formed on a metal oxide film on any suitable substrate by any suitable film formation method (eg, vacuum deposition, sputtering, CVD, ion plating, spraying, etc.). Can be formed. After film formation, heat treatment (for example, 100 ° C. to 200 ° C.) may be performed as necessary. By performing the heat treatment, the amorphous film can be crystallized.
  • suitable film formation method eg, vacuum deposition, sputtering, CVD, ion plating, spraying, etc.
  • heat treatment for example, 100 ° C. to 200 ° C.
  • 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.
  • the indium oxide may be doped with divalent metal ions or tetravalent metal ions.
  • Indium composite oxides are preferable, and indium-tin composite oxide (ITO) is more preferable.
  • Indium composite oxides are characterized by high transmittance (for example, 80% or more) in the visible light region (380 nm to 780 nm) and low surface resistance per unit area.
  • 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 surface resistance value of the conductive layer is preferably 300 ⁇ / ⁇ or less, more preferably 150 ⁇ / ⁇ or less, and further preferably 100 ⁇ / ⁇ or less.
  • the conductive layer can be patterned as needed. By conducting the patterning, a conductive portion and an insulating portion can be formed. 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.
  • Base material Any appropriate resin film may be used as the base material as long as the desired moisture permeability, dimensional change rate, and linear expansion coefficient described in the above section A are obtained.
  • the resin film has excellent transparency in addition to the above desired characteristics.
  • Specific examples of the constituent material include a cyclic olefin resin, a polycarbonate resin, a cellulose resin, a polyester resin, and an acrylic resin.
  • the substrate is optically isotropic.
  • the material constituting the optically isotropic substrate include, for example, a material having a main skeleton such as a norbornene-based resin or an olefin-based resin, a lactone ring, or glutar
  • examples thereof include materials having a cyclic structure such as an imide ring in the main chain of the acrylic resin.
  • the thickness of the substrate is preferably 10 ⁇ m to 200 ⁇ m, more preferably 20 ⁇ m to 60 ⁇ m.
  • a hard coat layer (not shown) may be provided between the conductive layer 41 and the base material 42.
  • a hard coat layer having any appropriate configuration can be used.
  • the thickness of the hard coat layer is, for example, 0.5 ⁇ m to 2 ⁇ m. If the haze is in an allowable range, fine particles for reducing Newton rings may be added to the hard coat layer.
  • the anchor coat layer for improving the adhesion of the conductive layer and / or the reflectance is adjusted between the conductive layer 41 and the base material 42 (a hard coat layer if present).
  • a refractive index adjustment layer may be provided. Arbitrary appropriate structures may be employ
  • the anchor coat layer and the refractive index adjusting layer can be thin layers of several nm to several tens of nm.
  • the hard coat layer typically includes a binder resin layer and spherical particles, and the spherical particles protrude from the binder resin layer to form convex portions. Details of such a hard coat layer are described in JP-A-2013-145547, and the description of the gazette is incorporated herein by reference.
  • the optical layered body according to the embodiment of the present invention may further include other retardation layers.
  • the optical characteristics for example, refractive index characteristics, in-plane retardation, Nz coefficient, photoelastic coefficient
  • thickness, arrangement position, and the like of other retardation layers can be appropriately set according to the purpose.
  • an adhesive layer (not shown) for bonding to the display cell is provided on the surface of the base material 42. It is preferable that a release film is bonded to the surface of the pressure-sensitive adhesive layer until the optical layered body is used.
  • the optical layered body described in the items A to G can be applied to an image display device. Therefore, the present invention includes an image display device using such an optical laminate. Typical examples of the image display device include a liquid crystal display device and an organic EL display device.
  • An image display device according to an embodiment of the present invention includes the optical layered body described in the items A to G on the viewing side.
  • the optical laminated body is laminated so that the conductive layer is on the display cell (for example, liquid crystal cell, organic EL cell) side (so that the polarizer is on the viewing side).
  • the image display device can be a so-called inner touch panel type input display device in which a touch sensor is incorporated between a display cell (for example, a liquid crystal cell or an organic EL cell) and a polarizing plate.
  • the touch sensor can be disposed between the conductive layer (or the conductive layer with the base material) and the display cell.
  • a configuration well known in the industry can be adopted, and a detailed description thereof will be omitted.
  • the present invention will be specifically described by way of examples, but the present invention is not limited to these examples.
  • the measuring method of each characteristic is as follows.
  • the applied retardation layer (alignment solidified layer of liquid crystal compound) was measured by an interference film thickness measurement method using MCPD2000 manufactured by Otsuka Electronics. The other films were measured using a digital micrometer (KC-351C manufactured by Anritsu).
  • Retardation value of retardation layer Refractive index nx, ny and nz of the retardation layer used in the examples and comparative examples were determined using an automatic birefringence measuring device (manufactured by Oji Scientific Instruments, automatic birefringence meter KOBRA- WPR).
  • the measurement wavelength of the in-plane retardation Re was 450 nm and 550 nm, the measurement wavelength of the thickness direction retardation Rth was 550 nm, and the measurement temperature was 23 ° C.
  • (4) Dimensional change rate The base material or retardation layer used in the examples and comparative examples, or the optical laminates obtained in the examples and comparative examples were cut into 100 mm ⁇ 100 mm and used as measurement samples.
  • the optical laminated body obtained by the Example and the comparative example was cut out to 100 mm x 50 mm, and was bonded together to the alkali free glass, and it was set as the measurement sample.
  • the measurement sample was stored in an oven at a temperature of 85 ° C. and a relative humidity of 85% for 120 hours. Thereafter, the measurement sample was taken out of the oven, the state of the conductive layer was observed with a laser microscope, and evaluated according to the following criteria. Good: No cracks were observed. Bad: Significant cracks were observed.
  • the weight ratio of iodine and potassium iodide is 1: 7, the iodine concentration of which is adjusted so that the single transmittance of the obtained polarizer is 45.0%.
  • the film was stretched 1.4 times.
  • the crosslinking treatment employed a two-stage crosslinking treatment, and the first-stage crosslinking treatment was stretched 1.2 times while being treated in an aqueous solution in which boric acid and potassium iodide were dissolved at 40 ° C.
  • the boric acid content of the aqueous solution of the first-stage crosslinking treatment was 5.0% by weight, and the potassium iodide content was 3.0% by weight.
  • the cross-linking treatment at the second stage was stretched 1.6 times while being treated in an aqueous solution in which boric acid and potassium iodide were dissolved at 65 ° C.
  • the boric acid content of the aqueous solution of the second crosslinking treatment was 4.3% by weight, and the potassium iodide content was 5.0% by weight.
  • the cleaning treatment was performed with an aqueous potassium iodide solution at 20 ° C.
  • the potassium iodide content of the aqueous solution for the washing treatment was 2.6% by weight.
  • the drying process was performed at 70 ° C. for 5 minutes to obtain a polarizer 1.
  • HC-TAC films (thickness: 32 ⁇ m, corresponding to the first protective layer) each having a hard coat (HC) layer formed by a hard coat treatment on one side of each of the first protective layer / polarizer A polarizing plate 1 having a configuration of 1 / second protective layer was obtained.
  • the conditions of the alignment treatment are as follows: the number of rubbing times (the number of rubbing rolls) is 1, the rubbing roll radius r is 76.89 mm, the rubbing roll rotational speed nr is 1500 rpm, the film transport speed v is 83 mm / sec, the rubbing strength RS and the pushing amount M was performed under five conditions (a) to (e) as shown in Table 1.
  • the direction of the orientation treatment was set to a ⁇ 75 ° direction when viewed from the viewing side with respect to the direction of the absorption axis of the polarizer when being bonded to the polarizing plate.
  • the liquid crystal coating liquid was applied to the alignment-treated surface with a bar coater, and the liquid crystal compound was aligned by heating and drying at 90 ° C. for 2 minutes. Under the conditions (a) to (c), the alignment state of the liquid crystal compound was very good. Under the conditions (d) and (e), a slight disturbance occurred in the alignment of the liquid crystal compound, but the level was not problematic for practical use.
  • the liquid crystal layer thus formed is irradiated with 1 mJ / cm 2 of light using a metal halide lamp, and the liquid crystal layer is cured to form a retardation layer (liquid crystal alignment solidified layer) 1 on the PET film. Formed.
  • the thickness of the retardation layer 1 was 2 ⁇ m, and the in-plane retardation Re (550) was 236 nm.
  • the pressure in the reaction vessel was changed from normal pressure to 13.3 kPa, and the generated phenol was extracted out of the reaction vessel while the temperature of the heat medium in the reaction vessel was increased to 190 ° C. over 1 hour.
  • the pressure in the reaction vessel is set to 6.67 kPa, and the heat medium temperature of the reaction vessel is increased to 230 ° C. in 15 minutes.
  • the generated phenol was extracted out of the reaction vessel. Since the stirring torque of the stirrer increased, the temperature was raised to 250 ° C. in 8 minutes, and the pressure in the reaction vessel was reduced to 0.200 kPa or less in order to remove the generated phenol.
  • the obtained polycarbonate resin had a glass transition temperature of 136.6 ° C. and a reduced viscosity of 0.395 dL / g.
  • the obtained polycarbonate resin was vacuum-dried at 80 ° C. for 5 hours, and then a single-screw extruder (made by Isuzu Chemical Industries, screw diameter 25 mm, cylinder set temperature: 220 ° C.), T-die (width 200 mm, set temperature: 220). ° C.), a chill roll (set temperature: 120 to 130 ° C.), and a film forming apparatus equipped with a winder, a 120 ⁇ m thick polycarbonate resin film was produced.
  • the polyolefin film on which the amorphous layer of indium tin oxide was formed was heat-treated in a heating oven at 130 ° C. for 90 minutes to produce a transparent conductive film having a surface resistance value of 100 ⁇ / ⁇ .
  • This transparent conductive film was used as a conductive layer with a substrate.
  • the moisture permeability of the substrate according to the above (3) is 7 mg / m 2 ⁇ 24 h
  • the dimensional change rate according to the above (4) is 0.03%
  • the linear expansion coefficient according to the above (5) is 7.3 ( ⁇ 10 ⁇ 6 / ° C.).
  • Reference Example 7 Production of conductive film (conductive layer with substrate)]
  • a transparent conductive film having a surface resistance value of 100 ⁇ / ⁇ was prepared in the same manner as in Reference Example 6 except that a PET film having a thickness of 50 ⁇ m (trade name “Lumirror # 50” manufactured by Toray Industries, Inc.) was used as the substrate.
  • This transparent conductive film was used as a conductive layer with a substrate.
  • the moisture permeability of the substrate according to the above (3) is 700 mg / m 2 ⁇ 24 h
  • the dimensional change rate according to the above (4) is 0.50%
  • the linear expansion coefficient according to the above (5) is 13.0 ( ⁇ 10 ⁇ 6 / ° C.).
  • Example 1 An acrylic adhesive having a thickness of 5 ⁇ m is used so that the angle between the absorption axis of the polarizer and the slow axis of the retardation layer 1 is 15 ° between the second protective layer surface of the polarizing plate 1 and the retardation layer 1. Pasted together. Next, the PET film on which the phase difference layer 1 has been formed is peeled off, and the phase difference layer 2 is formed on the peeled surface, and the angle between the absorption axis of the polarizer and the slow axis of the phase difference layer 2 is 75 °. In this way, they were bonded together through an acrylic adhesive having a thickness of 5 ⁇ m.
  • the PET film on which the retardation layer 2 was formed was peeled off to obtain a circularly polarizing plate 1 having a configuration of polarizing plate / first retardation layer / second retardation layer.
  • the second retardation layer of the circularly polarizing plate 1 and the conductive layer of the conductive layer with a base material obtained in Reference Example 6 were bonded to each other through the pressure-sensitive adhesive layer A to obtain an optical laminate 1.
  • the obtained optical laminated body 1 was used for evaluation of said (6). The results are shown in Table 2.
  • a retardation layer 3 (laminated retardation film) is used instead of the retardation layers 1 and 2, and the second protective layer surface of the polarizing plate 1 and the surface of the retardation layer film A are connected to the absorption axis of the polarizer and the retardation.
  • An acrylic adhesive having a thickness of 12 ⁇ m is used so that the angle between the slow axis of the film A is 15 ° and the angle between the absorption axis of the polarizer and the slow axis of the retardation film B is 75 °.
  • a circularly polarizing plate 2 having a configuration of polarizing plate / first retardation layer / second retardation layer was obtained by bonding.
  • the second retardation layer of the circularly polarizing plate 2 and the conductive layer of the conductive layer with a base material obtained in Reference Example 6 were bonded to each other through the pressure-sensitive adhesive layer A to obtain an optical laminate 2.
  • the obtained optical laminate 2 was subjected to the evaluation of (6) above. The results are shown in Table 2.
  • Example 1 The optical laminated body 3 was obtained like Example 1 except having used the electrically conductive layer with a base material obtained in Reference Example 7. The obtained optical laminated body 3 was used for evaluation of said (6). The results are shown in Table 2.
  • Example 2 The optical laminated body 4 was obtained like Example 2 except having used the electroconductive layer with a base material obtained in Reference Example 7. The obtained optical laminated body 4 was used for evaluation of said (6). The results are shown in Table 2.
  • the optical layered body of the present invention is suitably used for image display devices such as liquid crystal display devices and organic EL display devices, and can be particularly suitably used as an antireflection film for organic EL display devices. Furthermore, the optical layered body of the present invention can be suitably used for an inner touch panel type input display device.

Abstract

L'invention concerne un stratifié optique qui est supprimé lors du craquage d'une couche conductrice dans des conditions de température élevée et d'humidité élevée. Un stratifié optique selon la présente invention comprend séquentiellement, dans l'ordre suivant : une plaque de polarisation qui contient un polariseur et une couche de protection qui est disposée sur au moins une surface du polariseur; une première couche de retardement; une seconde couche de retardement; une couche conductrice; et un substrat qui est étroitement collé sur la couche conductrice. Le substrat a une perméabilité à la vapeur d'eau de 5 mg/m2·24h à 10 mg/m2·24h, un taux de variation dimensionnelle de 0,3 % ou moins, et un coefficient de dilatation linéaire de 5 (× 10-6/°C) à 10 (× 10-6/°C).
PCT/JP2017/025528 2016-10-04 2017-07-13 Stratifié optique et dispositif d'affichage d'image WO2018066199A1 (fr)

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