WO2021220681A1 - Plaque de polarisation circulaire équipée d'une couche antireflet et dispositif d'affichage d'image utilisant une plaque de polarisation circulaire équipée d'une couche antireflet - Google Patents

Plaque de polarisation circulaire équipée d'une couche antireflet et dispositif d'affichage d'image utilisant une plaque de polarisation circulaire équipée d'une couche antireflet Download PDF

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Publication number
WO2021220681A1
WO2021220681A1 PCT/JP2021/012502 JP2021012502W WO2021220681A1 WO 2021220681 A1 WO2021220681 A1 WO 2021220681A1 JP 2021012502 W JP2021012502 W JP 2021012502W WO 2021220681 A1 WO2021220681 A1 WO 2021220681A1
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Prior art keywords
polarizing plate
weight
layer
antireflection layer
less
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PCT/JP2021/012502
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English (en)
Japanese (ja)
Inventor
大介 尾込
亮 菅野
歩夢 中原
裕美 池嶋
尚樹 橋本
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日東電工株式会社
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Priority to CN202180031614.4A priority Critical patent/CN115461661A/zh
Priority to KR1020227034148A priority patent/KR20220144876A/ko
Publication of WO2021220681A1 publication Critical patent/WO2021220681A1/fr

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • 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
    • G02B1/11—Anti-reflection coatings
    • G02B1/111—Anti-reflection coatings using layers comprising organic materials
    • 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

Definitions

  • the present invention relates to a circularly polarizing plate with an antireflection layer and an image display device using the circularly polarizing plate with an antireflection layer.
  • a circular polarizing plate including a polarizing plate and a retardation plate may be used.
  • a circularly polarizing plate having high transmittance is desired from the viewpoint of low power consumption and brightness (luminance) of an image display device (particularly, an organic EL display device).
  • a circularly polarizing plate having a high transmittance may cause display unevenness (for example, streaks) in an image display device in a high temperature and high humidity environment.
  • Patent No. 5876441 Japanese Unexamined Patent Publication No. 2014-0262666
  • the present invention has been made to solve the above-mentioned conventional problems, and its main purpose is to have high transmittance and excellent durability in a high temperature and high humidity environment, and as a result, in a bright and high temperature and high humidity environment. It is an object of the present invention to provide a circularly polarizing plate with an antireflection layer which can realize an image display device in which display unevenness is suppressed.
  • the circularly polarizing plate with an antireflection layer is arranged on a polarizing plate containing a polarizing element, an antireflection layer arranged on one side of the polarizing plate, and on the other side of the polarizing plate. It has a retardation layer.
  • the transmittance of the circularly polarizing plate with an antireflection layer is 45.5% or more, and the reflectance after a heating and humidification test at 60 ° C. and 90% RH for 500 hours is 2.5% or less.
  • the polarizer and the protective layer on the antireflection layer side are bonded to each other via a first adhesive layer, and the polarizer and the retardation layer are bonded to each other via a second adhesive layer.
  • At least one of the first adhesive layer and the adhesive of the second adhesive layer is composed of an active energy ray-curable adhesive composition.
  • the active energy ray-curable adhesive composition has an SP value of 29.0 (MJ / m 3 ) 1/2 or more and 32.0 (MJ / m 3 ) 1 / when the total amount of the composition is 100% by weight.
  • the active energy ray-curable compound (A) having a value of 2 or less is 0.0% to 4.0% by weight, and the SP value is 18.0 (MJ / m 3 ) 1/2 or more and 21.0 (MJ / m 3).
  • the antireflection layer has a reflectance of 1.5% or less.
  • the Re (550) of the retardation layer is 100 nm to 200 nm, and the angle formed by the slow axis of the retardation layer and the absorption axis of the polarizer is 40 ° to 50 ° or 130. ° to 140 °.
  • the retardation layer is composed of a stretched film of a resin film, and Re (450) / Re (550) is 0.80 to 1.03.
  • Re (450) and Re (550) are in-plane phase differences measured with light having wavelengths of 450 nm and 550 nm at 23 ° C., respectively.
  • an image display device is provided. This image display device includes the above-mentioned circularly polarizing plate with an antireflection layer on the viewing side. The circularly polarizing plate with an antireflection layer is arranged so that the antireflection layer is on the viewing side. The reflectance of the image display device is 40% or less.
  • the image display device is an organic electroluminescence display device.
  • an antireflection layer is provided on the side that becomes a visible side when applied to an image display device, and a protective layer and / or position of a polarizer and an antireflection layer is provided.
  • An image display device that has high transmittance and excellent durability in a high temperature and high humidity environment by adhering the different layers with a predetermined adhesive, and as a result, display unevenness is suppressed in a bright and high temperature and high humidity environment. It is possible to obtain a circularly polarizing plate with an antireflection layer that can realize the above.
  • Refractive index (nx, ny, nz) “Nx” is the refractive index in the direction in which the in-plane refractive index is maximized (that is, the slow-phase axis direction), and “ny” is the in-plane direction orthogonal to the slow-phase axis (that is, the phase-advance axis direction). Is the refractive index of, and "nz” is the refractive index in the thickness direction.
  • In-plane phase difference (Re) “Re ( ⁇ )” is the in-plane phase difference of the film measured with light having a wavelength of ⁇ nm at 23 ° C.
  • Re (450) is an in-plane phase difference of a film measured with light having a wavelength of 450 nm at 23 ° C.
  • Phase difference in the thickness direction (Rth) is a phase difference in the thickness direction of the film measured with light having a wavelength of ⁇ nm at 23 ° C.
  • Rth (450) is a phase difference in the thickness direction of a film measured with light having a wavelength of 450 nm at 23 ° C.
  • FIG. 1 is a schematic cross-sectional view of a circularly polarizing plate with an antireflection layer according to one embodiment of the present invention.
  • the circularly polarizing plate 100 with an antireflection layer in the illustrated example is arranged on one side of the polarizing plate 10 and the polarizing plate 10 (for example, the side opposite to the image display cell when applied to an image display device, that is, the visual recognition side).
  • the antireflection layer 30 is provided, and the retardation layer 40 is arranged on the other side of the polarizing plate 10 (for example, the image display cell side when applied to an image display device).
  • the polarizing plate 10 includes a polarizing element 11 and a first protective layer 12 arranged on one side (antireflection layer side) of the polarizing element 11.
  • a second protective layer (not shown) may be provided on the retardation layer 40 side of the polarizer 11 depending on the purpose. Further, the protective layers on both sides of the polarizer may be omitted.
  • the antireflection layer is typically formed on a base material as described later
  • the base material / antireflection layer laminate may function as a protective layer.
  • the first protective layer 12 may be omitted.
  • the base material / antireflection layer laminate may further include a hard coat layer.
  • both protective layers are omitted, and the polarizing element 11, the antireflection layer 30 arranged on one side of the polarizer 11, and the polarizing plate 11 are arranged on the other side.
  • It may be configured to have the retarded retardation layer 40.
  • an arbitrary appropriate adhesive layer 50 is provided on the opposite side of the retardation layer 40 from the polarizing plate 10 as an outermost layer, and the circularly polarizing plate with an antireflection layer can be attached to an image display cell. ing.
  • the transmittance of the circularly polarizing plate with an antireflection layer is 45.5% or more, preferably 46.0% or more.
  • the upper limit of transmittance can be, for example, 46.5%.
  • the transmittance is in such a range, an image display device having sufficiently high brightness can be realized.
  • the circularly polarizing plate with an antireflection layer has a reflectance of 2.5% or less after a heating and humidification test at 60 ° C. and 90% RH for 500 hours, preferably 2.2. % Or less, more preferably 2.0% or less.
  • the lower limit of reflectance can be, for example, 1.0%.
  • the retardation layer 40 is typically composed of a stretched film of a resin film.
  • the Re (550) of the retardation layer 40 is typically 100 nm to 200 nm.
  • the Re (450) / Re (550) of the retardation layer is preferably 0.85 to 1.03.
  • the angle formed by the slow axis of the retardation layer and the absorption axis of the polarizer 11 is preferably 40 ° to 50 °, more preferably 42 ° to 48 °, and even more preferably 44 ° to 46 °. Yes, particularly preferably about 45 °; or preferably 130 ° to 140 °, more preferably 132 ° to 138 °, still more preferably 134 ° to 136 °, particularly preferably about 135 °. °.
  • the polarizer 11 and the protective layer 12 on the antireflection layer 30 side are typically bonded via a first adhesive layer 21. There is. Further, the polarizer 11 and the retardation layer 40 are typically bonded to each other via a second adhesive layer 22. At least one of the adhesives of the first adhesive layer 21 and the second adhesive layer 22 is typically composed of an active energy ray-curable adhesive composition.
  • the active energy ray-curable adhesive composition has an SP value of 29.0 (MJ / m 3 ) 1/2 or more and 32.0 (MJ / m 3 ) 1/2 when the total amount of the composition is 100% by weight.
  • the following active energy ray-curable compound (A) is 0.0% by weight to 4.0% by weight, and the SP value is 18.0 (MJ / m 3 ) 1/2 or more and 21.0 (MJ / m 3 ).
  • the active energy ray-curable compound (B) which is less than 1/2 is 5.0% by weight to 98.0% by weight, and the SP value is 21.0 (MJ / m 3 ) 1/2 or more and 26.0 (. MJ / m 3 ) Contains 5.0% by weight to 98.0% by weight of the active energy ray-curable compound (C) which is 1/2 or less.
  • the first adhesive layer 21 is composed of the above-mentioned active energy ray-curable adhesive composition, and more preferably, both the first adhesive layer 21 and the second adhesive layer 22 are described above. It is composed of an active energy ray-curable adhesive composition of.
  • the durability of the polarizing plate under high temperature and high humidity is improved (display unevenness is suppressed) by using the above-mentioned adhesive
  • the brightness (brightness) (brightness) when such a polarizing plate is applied to an image display device.
  • circularly polarized light with an antireflection layer can realize an image display device in which display unevenness is suppressed in a bright and high temperature and high humidity environment. You can get a board.
  • the antireflection layered circularly polarizing plate may further have another retardation layer (not shown) between the retardation layer 40 and the pressure-sensitive adhesive layer 50.
  • the circularly polarizing plate with an antireflection layer may further have a conductive layer or an isotropic base material with a conductive layer (not shown).
  • the circularly polarizing plate with an antireflection layer is a so-called inner touch panel 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 type input display devices.
  • the conductive layer or the isotropic base material with the conductive layer is typically provided between the retardation layer 40 and the pressure-sensitive adhesive layer 50.
  • the other retardation layer and the conductive layer or the isotropic base material with the conductive layer are typically provided in this order from the retardation layer 40 side.
  • the circularly polarizing plate with an antireflection layer may have an additional retardation layer (not shown).
  • the additional retardation layer may be provided in combination with another retardation layer, or may be provided alone (ie, without providing another retardation layer).
  • the optical characteristics for example, refractive index characteristics, in-plane retardation, Nz coefficient, photoelastic coefficient
  • thickness, arrangement position, and the like of the further retardation layer can be appropriately set according to the purpose.
  • the circularly polarizing plate with an antireflection layer may be single-wafered or elongated.
  • the term "long” means an elongated shape having a length sufficiently long with respect to the width, and for example, an elongated shape having a length of 10 times or more, preferably 20 times or more with respect to the width. include.
  • the elongated circularly polarizing plate with an antireflection layer can be wound in a roll shape.
  • a release film is temporarily attached to the surface of the pressure-sensitive adhesive layer 50 until a circularly polarizing plate with an antireflection layer is used.
  • the release film By temporarily attaching the release film, the pressure-sensitive adhesive layer can be protected and a roll of a circularly polarizing plate with an antireflection layer can be formed.
  • the resin film forming the polarizer may be a single-layer resin film or a laminated body having two or more layers.
  • the polarizer composed of a single-layer resin film include a hydrophilic polymer film such as a polyvinyl alcohol (PVA) -based film, a partially formalized PVA-based film, and an ethylene / vinyl acetate copolymer system partially saponified film.
  • a hydrophilic polymer film such as a polyvinyl alcohol (PVA) -based film, a partially formalized PVA-based film, and an ethylene / vinyl acetate copolymer system partially saponified film.
  • PVA polyvinyl alcohol
  • a partially formalized PVA-based film ethylene / vinyl acetate copolymer system partially saponified film
  • examples thereof include those which have been dyed and stretched with a bicolor substance such as iodine or a bicolor dye, and polyene-based oriented films such as a dehydrated product of PVA and a dehydrogenated product of polyvinyl chloride.
  • the above-mentioned dyeing with iodine is performed, for example, by immersing a PVA-based film in an aqueous iodine solution.
  • the draw ratio of the uniaxial stretching is preferably 3 to 7 times. Stretching may be performed after the dyeing treatment or while dyeing. Alternatively, it may be stretched and then dyed. If necessary, the PVA-based film is subjected to a swelling treatment, a cross-linking treatment, a washing treatment, a drying treatment and the like.
  • the polarizer obtained by 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.
  • Examples thereof include a polarizer obtained by using a laminate with a PVA-based resin layer coated and formed on a base material.
  • the polarizer obtained by using the laminate of the resin base material and the PVA-based resin layer coated and formed 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 resin base material.
  • stretching typically includes immersing the laminate in an aqueous boric acid solution for stretching. Further, stretching may further include, if necessary, stretching the laminate in the air at a high temperature (eg, 95 ° C. or higher) prior to stretching in boric acid aqueous solution.
  • a high temperature eg, 95 ° C. or higher
  • the obtained resin substrate / polarizer laminate may be used as it is (that is, the resin substrate may be used as a protective layer for the polarizer), and the resin substrate is peeled off from the resin substrate / polarizer laminate. Then, an arbitrary appropriate protective layer according to the purpose may be laminated on the peeled surface. Details of the method for producing such a polarizer are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580 and Japanese Patent No. 6470455. The description of these patent documents is incorporated herein by reference.
  • the polarizer can preferably be composed of a single-layer resin film. With such a configuration, a circularly polarizing plate with an antireflection layer in which phase difference unevenness is suppressed in a high temperature environment due to a synergistic effect with optimization of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer can be obtained. Can be obtained.
  • the thickness of the polarizer is preferably about 1 ⁇ m to 30 ⁇ m, more preferably about 5 ⁇ m to 25 ⁇ m.
  • a film is formed on a thermoplastic resin substrate as the polyvinyl alcohol-based film disclosed in JP2012-73580A, Patent No. 6470455, etc.
  • a method for producing a thin polarizer using a laminate containing a polyvinyl alcohol-based film can be applied.
  • the polarizer preferably exhibits absorption dichroism at any wavelength of 380 nm to 780 nm.
  • the simple substance transmittance of the polarizer is, for example, 41.5% to 46.0%, preferably 43.0% to 46.0%, and more preferably 44.5% to 46.0%.
  • the simple substance transmittance of the polarizer may be, for example, 44.0% or more, for example, 44.2% or more, or for example, 44.6% or more.
  • the degree of polarization 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 for the polarizer.
  • the material that is the main component of the film include cellulose-based resins such as triacetyl cellulose (TAC), polyester-based, polyvinyl alcohol-based, polycarbonate-based, polyamide-based, polyimide-based, polyethersulfone-based, and polysulfone-based.
  • TAC triacetyl cellulose
  • polyester-based polyvinyl alcohol-based
  • polycarbonate-based polyamide-based
  • polyimide-based polyimide-based
  • polyethersulfone-based polysulfone-based
  • thermosetting resins such as (meth) acrylic, urethane, (meth) acrylic urethane, epoxy, and silicone, or ultraviolet curable resins can also be mentioned.
  • glassy polymers such as siloxane-based polymers can also be mentioned.
  • the 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 a nitrile group in the side chain.
  • the polymer film can be, for example, an extruded product of the above resin composition.
  • the circularly polarizing plate with the antireflection layer is typically arranged on the visual side of the image display device, and the first protective layer 12 is typically arranged on the visual side. Therefore, the first protective layer 12 may be subjected to surface treatment such as hard coat treatment, antireflection treatment, anti-sticking treatment, and anti-glare treatment, if necessary. Further / or, if necessary, the first protective layer 12 is provided with a process for improving visibility when visually recognizing through polarized sunglasses (typically, a (elliptical) circularly polarized light function is imparted. (Giving an ultra-high phase difference) may be applied.
  • polarized sunglasses typically, a (elliptical) circularly polarized light function is imparted.
  • the circularly polarizing plate with an antireflection layer can be suitably applied to an image display device that can be used outdoors.
  • 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, and even more preferably 10 ⁇ m to 60 ⁇ m.
  • the thickness of the outer protective layer is the thickness including the thickness of the surface treatment layer.
  • the second protective layer 13 is preferably optically isotropic in one embodiment.
  • 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. say.
  • In-plane retardation Re (550) of the retardation layer is typically 100 nm to 200 nm, preferably 110 nm to 180 nm, more preferably 120 nm to 160 nm, and even more preferably 120 nm to 160 nm as described above. It is 130 nm to 150 nm. That is, the retardation layer can function as a so-called ⁇ / 4 plate.
  • the retardation layer may exhibit a reverse dispersion wavelength dependence in which the retardation value increases with the wavelength of the measurement light, and the retardation value is a flat wavelength that is substantially constant regardless of the wavelength of the measurement light. Dependencies may be shown.
  • Re (450) / Re (550) is preferably 0.80 to 0.97, more preferably 0.85 to 0.95.
  • Re (450) / Re (550) is preferably 0.97 to 1.03, more preferably 0.98 to 1.02.
  • the retardation layer Since the retardation layer has an in-plane retardation as described above, it has a relationship of nx> ny.
  • the retardation layer exhibits any suitable refractive index characteristic as long as it has a relationship of nx> ny.
  • the refractive index characteristics of the retardation layer typically show a relationship of nx> ny ⁇ nz.
  • the Nz coefficient of the retardation layer is preferably 0.9 to 2.0, more preferably 0.9 to 1.5, and even more preferably 0.9 to 1.2.
  • the thickness of the retardation layer can be set so that it can function most appropriately as a ⁇ / 4 plate. In other words, the thickness can be set to obtain the desired in-plane phase difference. Specifically, the thickness is preferably 70 ⁇ m or less, preferably 45 ⁇ m to 60 ⁇ m. When the thickness of the retardation layer is within such a range, it is possible to satisfactorily adjust the curl at the time of bonding while satisfactorily suppressing the curl at the time of heating.
  • the absolute value of the photoelastic coefficient of the retardation layer is preferably 20 ⁇ 10-12 (m 2 / N) or less, and more preferably 1.0 ⁇ 10-12 (m 2 / N) to 15 ⁇ 10. It is -12 (m 2 / N), more preferably 2.0 ⁇ 10 -12 (m 2 / N) to 12 ⁇ 10 -12 (m 2 / N).
  • the absolute value of the photoelastic coefficient is in such a range, display unevenness can be suppressed when the circularly polarizing plate with an antireflection layer is applied to an image display device.
  • the retardation layer may be composed of any suitable resin film that can satisfy the above characteristics.
  • resins are polycarbonate resins, polyester carbonate resins, polyester resins, polyvinyl acetal resins, polyarylate resins, cyclic olefin resins, cellulose resins, polyvinyl alcohol resins, and polyamide resins.
  • the retardation layer may be typically composed of a polycarbonate-based resin or a polyester carbonate-based resin (hereinafter, may be simply referred to as a polycarbonate-based resin).
  • the polycarbonate-based resin comprises a structural unit derived from a fluorene-based dihydroxy compound, a structural unit derived from an isosorbide-based dihydroxy compound, and an alicyclic diol, an alicyclic dimethanol, di, tri or polyethylene. It comprises glycols and structural units derived from at least one dihydroxy compound selected from the group consisting of alkylene glycols or spiroglycols.
  • the polycarbonate resin is a structural unit derived from a fluorene dihydroxy compound, a structural unit derived from an isosorbide dihydroxy compound, a structural unit derived from an alicyclic dimethanol, and / or di, tri or polyethylene glycol.
  • the polycarbonate-based resin may contain structural units derived from other dihydroxy compounds, if necessary.
  • the polycarbonate-based resin contains a structural unit derived from a dihydroxy compound having a bonding structure represented by the following formula (I).
  • dihydroxy compound examples include a compound represented by the following formula (II).
  • dihydroxy compounds include isosorbide, isomannide, and isoidet, which are in a stereoisomeric relationship. These may be used alone or in combination of two or more.
  • the above dihydroxy compound and another dihydroxy compound may be used in combination.
  • an alicyclic dihydroxy compound represented by the following formula (III) can be mentioned.
  • R 1 represents a cycloalkylene group having 4 to 20 carbon atoms.
  • the alicyclic dihydroxy compound can be, for example, tricyclodecanedimethanol, pentacyclopentadecanedimethanol.
  • R 1 in formula (III) is the following formula (IV) (wherein, n represents 0 or 1) the various isomers represented by.
  • the polycarbonate resin contains a structural unit represented by the following formula (V). That is, the polycarbonate resin can be a copolymer of diphenyl carbonate, isosorbide, and tricyclodecanedimethanol.
  • the glass transition temperature of the polycarbonate resin is preferably 110 ° C. or higher and 250 ° C. or lower, more preferably 120 ° C. or higher and 230 ° C. or lower. If the glass transition temperature is excessively low, the heat resistance tends to deteriorate, which may cause a dimensional change after film molding. If the glass transition temperature is excessively high, the molding stability during film molding may be deteriorated, and the transparency of the film may be impaired.
  • the glass transition temperature is determined according to JIS K 7121 (1987).
  • the molecular weight of the polycarbonate resin can be expressed by the reduced viscosity.
  • the reduced viscosity is measured by using methylene chloride as a solvent, precisely adjusting the polycarbonate concentration to 0.6 g / dL, and using an Ubbelohde viscous tube at a temperature of 20.0 ° C. ⁇ 0.1 ° C.
  • the lower limit of the reduction viscosity is usually preferably 0.30 dL / g, more preferably 0.35 dL / g or more.
  • the upper limit of the reduction viscosity is usually preferably 1.20 dL / g, more preferably 1.00 dL / g, and further preferably 0.80 dL / g.
  • the reduced viscosity is smaller than the lower limit, there may be a problem that the mechanical strength of the molded product is reduced.
  • the reduced viscosity is larger than the upper limit value, the fluidity at the time of molding is lowered, and there may be a problem that the productivity and the moldability are lowered.
  • a commercially available film may be used as the polycarbonate resin film.
  • Specific examples of commercially available products include the product names "Pure Ace WR-S”, “Pure Ace WR-W”, “Pure Ace WR-M” manufactured by Teijin Limited, and the product name "NRF” manufactured by Nitto Denko. Be done.
  • the retardation layer can be obtained, for example, by stretching a film formed of the above-mentioned polycarbonate resin.
  • any suitable molding processing method can be adopted. Specific examples include a compression molding method, a transfer molding method, an injection molding method, an extrusion molding method, a blow molding method, a powder molding method, an FRP molding method, a cast coating method (for example, a casting method), a calendar molding method, and a hot press. Law etc. can be mentioned. Extrusion molding method or cast coating method is preferable. This is because the smoothness of the obtained 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 characteristics desired for the retardation layer, and the like. As described above, since many film products of the polycarbonate resin are commercially available, the commercially available film may be subjected to the stretching treatment as it is.
  • the thickness of the resin film can be set to an arbitrary appropriate value according to the desired thickness of the retardation layer, desired optical characteristics, stretching conditions described later, and the like. It is preferably 50 ⁇ m to 300 ⁇ m.
  • any appropriate stretching method and stretching conditions for example, stretching temperature, stretching ratio, stretching direction
  • various stretching methods such as free-end stretching, fixed-end stretching, free-end contraction, and fixed-end contraction can be used alone or simultaneously or sequentially.
  • the stretching direction it can 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., relative 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
  • the retardation film is produced by uniaxially stretching or fixed end uniaxially stretching the resin film.
  • the fixed-end uniaxial stretching include a method of stretching the resin film in the width direction (lateral direction) while running the resin film in the longitudinal direction.
  • the draw ratio is preferably 1.1 times to 3.5 times.
  • the retardation film can be produced by continuously obliquely stretching a long resin film in the direction of the above angle ⁇ with respect to the longitudinal direction.
  • a long stretched film having an orientation angle of an angle ⁇ with respect to the longitudinal direction of the film (a slow axis in the direction of the angle ⁇ ) can be obtained.
  • Roll-to-roll is possible, and the manufacturing process can be simplified.
  • the angle ⁇ may be an angle formed by the absorption axis of the polarizing film and the slow axis of the retardation layer in the polarizing plate with a retardation layer.
  • the angle ⁇ is preferably 40 ° to 50 °, more preferably 42 ° to 48 °, and even more preferably about 45 °.
  • Examples of the stretching machine used for diagonal stretching include a tenter type stretching machine capable of applying a feeding force, a pulling force, or a pulling force at different speeds in the horizontal and / or vertical 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 the long resin film can be continuously and diagonally stretched.
  • Phase difference film By appropriately controlling the left and right velocities in the stretching machine, a retardation layer having the desired in-plane phase difference and having a slow phase axis in the desired direction (substantially long). (Phase difference film) can be obtained.
  • the stretching temperature of the film can change depending on the in-plane retardation value and thickness desired for the 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 + 20 ° C, and most preferably Tg-10 ° C to Tg + 15 ° C. By stretching at such a temperature, a retardation layer having appropriate characteristics in the present invention can be obtained. Tg is the glass transition temperature of the constituent material of the film.
  • the antireflection layer 30 is typically a cured layer of an ionizing radiation curable resin composition. As described above, by providing the antireflection layer, it is possible to realize a high transmittance which is difficult to realize by the circularly polarizing plate alone.
  • the reflectance of the antireflection layer is preferably 1.5% or less, more preferably 1.3% or less, still more preferably 1.0% or less. The smaller the reflectance, the more preferable, and the lower limit thereof can be, for example, 0.2%. When the reflectance is in such a range, it is possible to prevent reflection of external light and the like.
  • the ionizing radiation curable resin composition contains an ionizing radiation curable resin.
  • the ionizing radiation curable resin composition may further contain a reactive diluent, a fluorine element-containing additive, hollow particles, and / or solid particles, depending on the purpose.
  • Typical examples of the ionizing radiation curable resin include a thermosetting resin, an ultraviolet curable resin, a light (visible light) curable resin, and an electron beam curable resin.
  • examples of the ionizing radiation curable resin include silicone resin, polyester resin, polyether resin, epoxy resin, urethane resin, alkyd resin, spiroacetal resin, polybutadiene resin, and polythiol polyene resin.
  • the ionizing radiation curable resin can be a curable compound having an acrylate group and / or a methacrylate group that is cured by heat, light (ultraviolet rays, etc.), an electron beam, or the like. Specific examples include oligomers or prepolymers such as acrylates and / or methacrylates of polyfunctional compounds such as polyhydric alcohols.
  • the ionizing radiation curable resin may be used alone or in combination of two or more.
  • the ionizing radiation curable resin may have a weight average molecular weight before curing, for example, 100 or more, 300 or more, 500 or more, 1000 or more, or 2000 or more, and 100,000 or less, 70,000 or less, 50,000 or less, 30,000 or less, Alternatively, it may be 10,000 or less. If the weight average molecular weight before curing is large, the hardness tends to decrease, but cracks tend to be less likely to occur when bent. If the weight average molecular weight before curing is small, the intermolecular crosslink density tends to be improved and the hardness tends to be high.
  • the reactive diluent typically contains an acrylate group and / or a methacrylate group.
  • the reactive diluent for example, the reactive diluent described in JP-A-2008-88309 can be used.
  • Specific examples of the reactive diluent include monofunctional acrylate, monofunctional methacrylate, polyfunctional acrylate, and polyfunctional methacrylate. Preferably, it is a trifunctional or higher functional acrylate or a trifunctional or higher functional methacrylate.
  • the reactive diluent include butanediol glycerin ether diacrylate, isocyanuric acid acrylate, and isocyanuric acid methacrylate.
  • the reactive diluent may be used alone or in combination of two or more.
  • the fluorine element-containing additive can be, for example, an organic compound or an inorganic compound containing fluorine in the molecule.
  • the organic compound include a fluorine-containing antifouling coating agent, a fluorine-containing acrylic compound, and a fluorine / silicon-containing acrylic compound.
  • a commercially available product may be used. Specific examples include the product name "KY-1203" manufactured by Shin-Etsu Chemical Co., Ltd. and the product name "Mega Fuck" manufactured by DIC Corporation.
  • the inorganic compound any suitable fluorine-containing inorganic compound can be used.
  • the blending amount of the fluorine element-containing additive is, for example, 0.05 parts by weight or more, 0.1 parts by weight or more, 0.15 parts by weight or more, 0.20 parts by weight with respect to 100 parts by weight of the ionizing radiation curable resin. It may be more than or equal to 0.25 parts by weight or more, and may be 20 parts by weight or less, 15 parts by weight or less, 10 parts by weight or less, 5 parts by weight or less, or 3 parts by weight or less.
  • any suitable hollow particles can be used. Specific examples include silica particles, acrylic particles, and acrylic-styrene copolymer particles. Commercially available products may be used as the hollow particles. Specific examples of commercially available silica particles include the trade names "Thruria 5320" and "Thruria 4320" manufactured by JGC Catalysts and Chemicals Co., Ltd.
  • the weight average particle size of the hollow particles may be, for example, 30 nm or more, 40 nm or more, 50 nm or more, 60 nm or more, or 70 nm or more, and is 150 nm or less, 140 nm or less, 130 nm or less, 120 nm or less, or 110 nm or less. May be good.
  • the shape of the hollow particles may be, for example, a bead-shaped substantially spherical shape, or an irregular shape such as powder. It is preferably substantially spherical, more preferably substantially spherical with an aspect ratio of 1.5 or less, and even more preferably substantially true spherical.
  • an antireflection layer having a low refractive index and good antireflection characteristics can be obtained.
  • the amount of the hollow particles to be blended may be, for example, 30 parts by weight or more, 50 parts by weight or more, 70 parts by weight or more, 90 parts by weight or more, or 100 parts by weight or more with respect to 100 parts by weight of the ionizing radiation curable resin.
  • It may be 300 parts by weight or less, 270 parts by weight or less, 250 parts by weight or less, 200 parts by weight or less, or 180 parts by weight or less.
  • the blending amount is in such a range, an antireflection layer having excellent mechanical properties and a low refractive index can be obtained.
  • any suitable solid particles can be used. Specific examples include silica particles, zirconium oxide particles, and titanium particles. Commercially available products may be used as the solid particles. Specific examples of commercially available silica particles include trade names "MEK-2140Z-AC", “MIBK-ST”, and "IPA-ST” manufactured by Nissan Chemical Industries, Ltd.
  • the weight average particle size of the solid particles may be, for example, 5 nm or more, 10 nm or more, 15 nm or more, 20 nm or more, or 25 nm or more, and is 3300 nm or less, 250 nm or less, 200 nm or less, 150 nm or less, or 100 nm or less. You may.
  • the shape of the solid particles may be, for example, a bead-shaped substantially spherical shape, or an amorphous shape such as powder. It is preferably substantially spherical, more preferably substantially spherical with an aspect ratio of 1.5 or less, and even more preferably substantially true spherical.
  • the fluorine element-containing additive tends to be unevenly distributed on the surface of the antireflection layer, and as a result, an antireflection layer having a low refractive index and good antireflection characteristics can be obtained.
  • the blending amount of the solid particles is, for example, 5 parts by weight or more, 10 parts by weight or more, 15 parts by weight or more, 20 parts by weight or more, or 25 parts by weight or more with respect to 100 parts by weight of the ionizing radiation curable resin. It may be 150 parts by weight or less, 120 parts by weight or less, 100 parts by weight or less, or 80 parts by weight or less. When the blending amount is in such a range, an antireflection layer having an excellent balance of mechanical properties, refractive index and transparency can be obtained.
  • the antireflection layer can be typically formed by the following manufacturing method: a coating solution for forming an antireflection layer obtained by diluting an ionizing radiation curable resin composition with a diluting solvent is applied; and the coating film is dried. And cure the dry coating film.
  • any suitable solvent can be used depending on the ionizing radiation curable resin.
  • the diluting solvent include alcohols such as methanol, ethanol, isopropyl alcohol, butanol, TBA (terrary butyl alcohol) and 2-methoxyethanol; and ketones such as acetone, methyl ethyl ketone, MIBK (methyl isobutyl ketone) and cyclopentanone.
  • esters such as methyl acetate, ethyl acetate, butyl acetate, PMA (propylene glycol monomethyl ether acetate); ethers such as diisopropyl ether and propylene glycol monomethyl ether; glycols such as ethylene glycol and propylene glycol; ethyl cellosolve, butyl cellosolve Such as cellosolves; aliphatic hydrocarbons such as hexane, heptane and octane; aromatic hydrocarbons such as benzene, toluene and xylene.
  • the diluting solvent may be used alone or in combination of two or more.
  • the polarity can be adjusted by mixing a plurality of solvents at an arbitrary appropriate ratio according to the purpose.
  • the diluting solvent can be, for example, a mixed solvent containing MIBK and PMA.
  • the mixing ratio in this case can be appropriately set according to the purpose.
  • the mixing ratio may be, for example, 20 parts by weight or more, 50 parts by weight or more, 100 parts by weight or more, 150 parts by weight or more, or 200 parts by weight or more, and 400 parts by weight or more, with respect to 100 parts by weight of MIBK.
  • it may be 350 parts by weight or less, 300 parts by weight or less, or 250 parts by weight or less.
  • the diluting solvent can be, for example, a mixed solvent containing TBA in addition to MIBK and PMA.
  • the mixing ratio in this case can also be appropriately set according to the purpose.
  • the mixing ratio may be, for example, 10 parts by weight or more, 30 parts by weight or more, 50 parts by weight or more, 80 parts by weight or more, or 100 parts by weight or more, and 200 parts by weight or more, with respect to 100 parts by weight of MIBK.
  • it may be 180 parts by weight or less, 150 parts by weight or less, 130 parts by weight or less, or 110 parts by weight or less
  • the TBA is, for example, 10 parts by weight or more, 30 parts by weight or more, 50 parts by weight or more, 80 parts by weight. It may be 2 parts or more, 100 parts by weight or more, 200 parts by weight or less, 180 parts by weight or less, 150 parts by weight or less, 130 parts by weight or less, or 110 parts by weight or less.
  • the solid content concentration of the coating liquid should be, for example, 0.1% by weight or more, 0.3% by weight or more, 0.5% by weight or more, 1.0% by weight or more, or 1.5% by weight or more. It may be 20% by weight or less, 15% by weight or less, 10% by weight or less, 5% by weight or less, or 3% by weight or less.
  • the solid content concentration is within such a range, it is possible to achieve both coatability (for example, wetness and leveling) and prevention of poor appearance of the coating film (for example, air-drying unevenness and whitening).
  • a curing agent may be added to the coating liquid as needed.
  • any suitable polymerization initiator for example, thermal polymerization initiator, photopolymerization initiator, etc.
  • the amount of the curing agent added is, for example, 0.5 parts by weight or more, 1.0 part by weight or more, 1.5 parts by weight or more, 2.0 parts by weight or more, or more than 100 parts by weight of the ionizing radiation curable resin. It may be 2.5 parts by weight or more, 15 parts by weight or less, 13 parts by weight or less, 10 parts by weight or less, 7 parts by weight or less, or 5 parts by weight or less.
  • the antireflection layer is typically formed on any suitable substrate and then laminated on a polarizer or polarizing plate via any suitable adhesive layer or pressure-sensitive adhesive layer.
  • the coating liquid is applied onto the base material.
  • any suitable method can be adopted. Specific examples include a fanten coating method, a die coating method, a spin coating method, a spray coating method, a gravure coating method, a roll coating method, and a bar coating method.
  • the amount of the coating liquid applied can be appropriately set according to the thickness of the antireflection layer to be formed.
  • the thickness of the antireflection layer formed may be, for example, 0.1 ⁇ m or more, 0.3 ⁇ m or more, 0.5 ⁇ m or more, 1.0 ⁇ m or more, or 2.0 ⁇ m or more, and may be 50 ⁇ m or less, 40 ⁇ m or less, 30 ⁇ m. Hereinafter, it may be 20 ⁇ m or less, or 10 ⁇ m or less.
  • the drying temperature can be set appropriately according to the purpose.
  • the drying temperature may be, for example, 30 ° C. or higher, 40 ° C. or higher, 50 ° C. or higher, 60 ° C. or higher, 70 ° C. or higher, 80 ° C. or higher, 90 ° C. or higher, or 100 ° C. or higher, 200 ° C. or lower, 190 ° C. or higher.
  • it may be 180 ° C. or lower, 170 ° C. or lower, 160 ° C. or lower, 150 ° C. or lower, 140 ° C. or lower, 135 ° C. or lower, 130 ° C. or lower, 120 ° C.
  • the drying time can also be set appropriately according to the purpose.
  • the drying time may be, for example, 30 seconds or more, 40 seconds or more, 50 seconds or more, or 60 seconds or more, and may be 150 seconds or less, 130 seconds or less, 110 seconds or less, or 90 seconds or less.
  • the coating film is cured.
  • Curing can be performed by, for example, heating, light irradiation, or the like.
  • the light used for light irradiation may be, for example, ultraviolet light or visible light.
  • the light source for light irradiation can be, for example, a high pressure mercury lamp.
  • the amount of irradiation with the energy radiation source in the ultraviolet curing of accumulative exposure at an ultraviolet wavelength of 365nm, 50mJ / cm 2 ⁇ 500mJ / cm 2 is preferred.
  • the irradiation amount is 50 mJ / cm 2 or more, the curing tends to proceed sufficiently, and the hardness of the formed antireflection layer tends to increase.
  • the irradiation amount is 500 mJ / cm 2 or less, coloring of the formed antireflection layer can be prevented.
  • first Adhesive Layer 21 and the second adhesive layer 22 is typically an active energy ray-curable type. It is composed of an adhesive composition.
  • the active energy ray-curable adhesive composition has an SP value of 29.0 (MJ / m 3 ) 1/2 or more and 32.0 (MJ / m 3 ) 1/2 when the total amount of the composition is 100% by weight.
  • the following active energy ray-curable compound (A) is 0.0% by weight to 4.0% by weight, and the SP value is 18.0 (MJ / m 3 ) 1/2 or more and 21.0 (MJ / m 3 ).
  • the active energy ray-curable compound (B) which is less than 1/2 is 5.0% by weight to 98.0% by weight, and the SP value is 21.0 (MJ / m 3 ) 1/2 or more and 26.0 (. MJ / m 3 ) Contains 5.0% by weight to 98.0% by weight of the active energy ray-curable compound (C) which is 1/2 or less.
  • the first adhesive layer 21 is composed of the above-mentioned active energy ray-curable adhesive composition, and more preferably, both the first adhesive layer 21 and the second adhesive layer 22 are described above. It is composed of an active energy ray-curable adhesive composition of.
  • the other adhesive layer is any suitable adhesive. It may consist of an agent.
  • the active energy ray-curable compound (A) include hydroxyethyl acrylamide (SP value 29.5) and N-methylol acrylamide (SP value 31.5).
  • the content of the compound (A) is preferably 4.0% by weight or less, more preferably 2.0% by weight, still more preferably 1.5% by weight, when the total amount of the composition is 100% by weight. It is particularly preferably 1.0% by weight.
  • the composition preferably does not contain compound (A).
  • active energy ray-curable compound (B) examples include tripropylene glycol diacrylate (SP value 19.0), 1,9-nonanediol diacrylate (SP value 19.2), and tricyclodecanedimethanol dimethylate.
  • SP value 19.0 tripropylene glycol diacrylate
  • SP value 19.2 1,9-nonanediol diacrylate
  • SP value 19.3 tricyclodecanedimethanol dimethylate.
  • Acrylate SP value 20.3
  • cyclic trimethylolpropane formal acrylate SP value 19.1
  • dioxane glycol diacrylate SP value 19.4
  • EO-modified diglycerin tetraacrylate SP value 20.9
  • the content of the compound (B) is preferably 20% by weight to 80% by weight, more preferably 25% by weight to 70% by weight, when the total amount of the composition is 100% by weight.
  • the active energy ray-curable compound (C) examples include acryloyl morpholine (SP value 22.9), N-methoxymethylacrylamide (SP value 22.9), and N-ethoxymethylacrylamide (SP value 22.3). Can be mentioned.
  • a commercially available product may be used as the compound (C). Specific examples of commercially available products include ACMO (manufactured by Kojin Co., SP value 22.9), Wasmer 2MA (manufactured by Kasano Kosan Co., SP value 22.9), Wasmer EMA (manufactured by Kasano Kosan Co., SP value 22.3). ), Wasmer 3MA (manufactured by Kasano Kosan Co., Ltd., SP value 22.4).
  • the content of the compound (C) is preferably 20% by weight to 80% by weight, more preferably 25% by weight to 70% by weight, when the total amount of the composition is 100% by weight.
  • the SP value (solubility parameter) is determined by the Fedors calculation method [see “Polymer Eng. & Sci.”, Vol. 14, No. 2 (1974), pp. 148-154]. be able to.
  • the active energy ray-curable adhesive composition may further contain an acrylic oligomer (D) obtained by polymerizing a (meth) acrylic monomer.
  • an acrylic oligomer (D) obtained by polymerizing a (meth) acrylic monomer.
  • the content of the oligomer (D) is preferably 3.0% by weight or more, more preferably 5.0% by weight or more, when the total amount of the composition is 100% by weight.
  • the content is preferably 25% by weight or less, and more preferably 15% by weight or less.
  • the weight average molecular weight Mw of the oligomer (D) is preferably 15,000 or less, more preferably 10,000 or less, and even more preferably 5,000 or less.
  • the weight average molecular weight Mw is preferably 500 or more, more preferably 1000 or more, and further preferably 1500 or more.
  • the active energy ray-curable adhesive composition may further contain a radical polymerization initiator (E) having a hydrogen abstraction action.
  • a radical polymerization initiator (E) having a hydrogen abstraction action.
  • examples of the radical polymerization initiator (E) include a thioxanthone-based radical polymerization initiator and a benzophenone-based radical polymerization initiator. Diethyl thioxanthone is preferred.
  • the thickness of the first adhesive layer and / or the second adhesive layer composed of the active energy ray-curable adhesive composition is preferably 0.01 ⁇ m to 3.0 ⁇ m, and more preferably 0. It is 1 ⁇ m to 2.5 ⁇ m, more preferably 0.5 ⁇ m to 1.5 ⁇ m.
  • An easy-adhesion layer may be formed between the polarizing plate and the first adhesive layer and / or the second adhesive layer.
  • the circularly polarizing plate with an antireflection layer according to the above items A to F can be applied to an image display device. Therefore, the embodiment of the present invention also includes an image display device using such a circularly polarizing plate with an antireflection layer.
  • the image display device according to the embodiment of the present invention typically includes the circularly polarizing plate with an antireflection layer according to the above items A to F on the visible side thereof.
  • the circularly polarizing plate with an antireflection layer is arranged so that the antireflection layer is on the viewing side.
  • the reflectance of the image display device is preferably 40% or less.
  • the effect of the circularly polarizing plate with an antireflection layer according to the above items A to F becomes remarkable. Specifically, it is as follows. If the reflectance of the image display device is low, the reflection of the displayed image can be reduced, but display unevenness (for example, streaks) is less likely to be visually recognized by the image legal affairs device in a high temperature and high humidity environment.
  • Typical examples of the image display device include a liquid crystal display device and an organic electroluminescence (EL) display device. An organic EL display device is preferable.
  • Transmittance The transmittance of the circularly polarizing plate with an antireflection layer obtained in Examples and Comparative Examples was measured using an ultraviolet-visible spectrophotometer (V-7100 manufactured by JASCO Corporation). The single transmittance is a Y value measured by a JIS Z 8701 2 degree field of view (C light source) and corrected for luminosity factor.
  • Reflectance The circularly polarizing plate with an antireflection layer obtained in Examples and Comparative Examples was cut out to a predetermined size, and the surface of the retardation layer was subjected to corona treatment.
  • the corona-treated surface of the circularly polarizing plate with an antireflection layer was bonded to a non-alkali glass plate via an acrylic pressure-sensitive adhesive (20 ⁇ m) to prepare a laminated body.
  • the laminate was subjected to a heating and humidification test at 60 ° C. and 90% RH for 500 hours.
  • the laminate after the heating / humidifying test was placed on an organic EL device substitute so that the glass plate surfaces faced each other, and used as a test sample.
  • the front reflectance of this test sample was measured using a spectrocolorimeter "CM-2600d" manufactured by Konica Minolta.
  • the front reflectance was measured by the SCI method.
  • a substitute for the organic EL display device was produced as follows.
  • the temperature rise and depressurization in the second reactor were started, and the internal temperature was 240 ° C. and the pressure was 0.2 kPa in 50 minutes. Then, the polymerization was allowed to proceed until the stirring power became a predetermined value. When the predetermined power was reached, nitrogen was introduced into the reactor to repressurize, the produced polyester carbonate-based resin was extruded into water, and the strands were cut to obtain pellets.
  • the obtained polyester carbonate-based resin (pellets) was vacuum-dried at 80 ° C. for 5 hours, and then a single-screw extruder (manufactured by Toshiba Machine Co., Ltd., cylinder set temperature: 250 ° C.), T-die (width 200 mm, set temperature: 250).
  • a long resin film having a thickness of 135 ⁇ m was prepared by using a film forming apparatus equipped with a chill roll (set temperature: 120 to 130 ° C.) and a winder.
  • the obtained elongated resin film was stretched in the width direction at a stretching temperature of 133 ° C. and a stretching ratio of 2.8 times to obtain a retardation film I having a thickness of 48 ⁇ m.
  • the Re (550) of the obtained retardation film was 141 nm, the Re (450) / Re (550) was 0.82, and the Nz coefficient was 1.12.
  • the heating tank temperature was heated to 150 ° C., and the raw materials were dissolved while stirring as necessary (about 15 minutes).
  • the pressure was changed from normal pressure to 13.3 kPa, and the generated phenol was extracted from the reaction vessel while raising the heating tank temperature to 190 ° C. in 1 hour.
  • the pressure inside the reaction vessel is set to 6.67 kPa, the heating tank temperature is raised to 230 ° C. in 15 minutes, and the generated phenol is generated. It was taken out of the reaction vessel. Since the stirring torque of the stirrer increased, the temperature was raised to 250 ° C.
  • a resin film was prepared using a film forming apparatus equipped with a temperature (120 to 130 ° C.) and a winder.
  • the obtained elongated resin film was stretched in an oblique direction at a stretching temperature of 140 ° C. and a stretching ratio of 2.2 times to obtain a retardation film II having a thickness of 30 ⁇ m.
  • the Re (550) of the obtained retardation film was 144 nm, the Re (450) / Re (550) was 1.02, and the Nz coefficient was 1.2.
  • This mixture was diluted with a butyl acetate / cyclopentanone mixed solvent (weight ratio 80/20) so that the solid content concentration became 40% to prepare a hard coat layer forming material (coating liquid).
  • the coating liquid was applied to the surface of a base material (TAC film having a thickness of 60 ⁇ m) with a wire bar.
  • the coated coating liquid was heated at 80 ° C. for 1 minute and dried to form a coating film.
  • the dried coating film was irradiated with ultraviolet rays having an integrated light intensity of 300 mJ / cm 2 with a high-pressure mercury lamp to cure the coating film, and a hard coat film (hard coat layer) was obtained on the substrate.
  • a coating liquid for forming an antireflection layer was prepared by stirring so that the content was 4% by weight.
  • the antireflection layer forming coating liquid obtained in Production Example 4-2 was coated on the surface of the hard coat layer of the laminate of the base material / hard coat layer obtained in Production Example 4-1 with a wire bar.
  • the coated coating liquid was heated at 80 ° C. for 1 minute and dried to form a coating film.
  • the dried coating film was irradiated with ultraviolet rays having an integrated light intensity of 300 mJ / cm 2 with a high-pressure mercury lamp to cure the coating film, and an antireflection layer was formed. In this way, a laminate of a base material / hard coat (HC) layer / antireflection layer was produced.
  • Adhesive Composition Constituting Adhesive Layer As an adhesive, hydroxyethyl acrylamide (manufactured by Kojin Co., Ltd., trade name "HEAA”, SP value: 29.5) 12 parts by weight, acryloyl morpholin (manufactured by Kojin Co., Ltd., trade name “ACMO”, SP value: 22.9) ) 35 parts by weight, 1,9-nonanediol diacrylate (trade name "light acrylate 1,9ND-A", manufactured by Kyoeisha Chemical Co., Ltd.) 40 parts by weight, acrylic oligomer (trade name "ARUFON UG4010", manufactured by Toa Synthetic Co., Ltd.) ) 10 parts by weight, as a photopolymerization initiator, KAYACURE DETX-S ((2,4-diethylthioxanthone), manufactured by Nippon Kayaku Co., Ltd.) 2 parts by weight and a photosens
  • Examples 1 to 4 and Comparative Examples 1 to 5 The polarizing plate, the retardation film (phase difference layer), the antireflection layer, and the adhesive (the first adhesive layer and the second adhesive layer) are combined as shown in Table 1 as shown in FIG. (However, without the first and second protective layers) A circularly polarizing plate with an antireflection layer was produced.
  • the specific production method was as follows. The easy-adhesion composition of Production Example 7 was applied to both sides of the polarizer with an initial setting thickness of 1100 nm.
  • a first adhesive layer is formed on the surface of the base material of the laminate obtained in Production Example 4, and the antireflection layer is formed into a polarizing plate (substantially, an easy-adhesive layer) via the first adhesive layer. ).
  • a second adhesive layer is formed on one surface of the retardation film constituting the retardation layer obtained in Production Example 3, and the retardation film is made into a polarizing plate () via the second adhesive layer. Substantially, it was bonded to the easy-adhesion layer).
  • visible light was irradiated with an active energy ray irradiator to cure the first and second adhesive layers, and the adhesive layers were further dried with hot air at 70 ° C.
  • the circularly polarizing plate with an antireflection layer of the present invention can be suitably used for an image display device (typically, a liquid crystal display device or an organic EL display device).
  • an image display device typically, a liquid crystal display device or an organic EL display device.
  • Polarizing plate 11 Polarizer 12 First protective layer 21 First adhesive layer 22 Second adhesive layer 30 Anti-reflection layer 40 Phase difference layer 100 Circularly polarizing plate with anti-reflection layer

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
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  • Electroluminescent Light Sources (AREA)
  • Surface Treatment Of Optical Elements (AREA)
  • Adhesive Tapes (AREA)

Abstract

L'invention concerne une plaque de polarisation circulaire équipée d'une couche antireflet ayant une transmittance élevée et une excellente durabilité dans un environnement à haute température et humidité élevée, ce qui permet d'obtenir un dispositif d'affichage d'image vive dans lequel l'irrégularité de l'affichage est supprimée dans un environnement à haute température et humidité élevée. Une plaque de polarisation circulaire équipée d'une couche antireflet selon un mode de réalisation de la présente invention comprend : une plaque de polarisation comprenant un polariseur ; une couche antireflet disposée sur une surface de la plaque de polarisation ; et une couche de contraste de phase disposée sur l'autre surface de la plaque de polarisation. La transmittance de la plaque de polarisation circulaire équipée d'une couche antireflet est supérieure ou égale à 45,5 %, et la réflectance après un test de chauffage/humidification à 500 heures à 60 °C, 90 % RH est de 2,5 % ou moins.
PCT/JP2021/012502 2020-04-30 2021-03-25 Plaque de polarisation circulaire équipée d'une couche antireflet et dispositif d'affichage d'image utilisant une plaque de polarisation circulaire équipée d'une couche antireflet WO2021220681A1 (fr)

Priority Applications (2)

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CN202180031614.4A CN115461661A (zh) 2020-04-30 2021-03-25 带防反射层的圆偏光板和使用了该带防反射层的圆偏光板的图像显示装置
KR1020227034148A KR20220144876A (ko) 2020-04-30 2021-03-25 반사 방지층 부착 원편광판 및 해당 반사 방지층 부착 원편광판을 이용한 화상 표시 장치

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JP2020-080741 2020-04-30
JP2020080741A JP2021173979A (ja) 2020-04-30 2020-04-30 反射防止層付円偏光板および該反射防止層付円偏光板を用いた画像表示装置

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WO2019124347A1 (fr) * 2017-12-22 2019-06-27 大日本印刷株式会社 Stratifié optique, écran d'affichage, et dispositif d'affichage
JP2019147865A (ja) * 2018-02-26 2019-09-05 日東電工株式会社 活性エネルギー線硬化型接着剤組成物、偏光フィルムおよびその製造方法、光学フィルム、ならびに画像表示装置

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WO2023106141A1 (fr) * 2021-12-07 2023-06-15 東洋インキＳｃホールディングス株式会社 Liquide de revêtement pour former une couche à faible indice de réfraction, couche à faible indice de réfraction et film antireflet

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JP2021173979A (ja) 2021-11-01

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