WO2021193320A1 - 偏光板およびその製造方法、ならびに該偏光板を用いた画像表示装置 - Google Patents

偏光板およびその製造方法、ならびに該偏光板を用いた画像表示装置 Download PDF

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WO2021193320A1
WO2021193320A1 PCT/JP2021/010962 JP2021010962W WO2021193320A1 WO 2021193320 A1 WO2021193320 A1 WO 2021193320A1 JP 2021010962 W JP2021010962 W JP 2021010962W WO 2021193320 A1 WO2021193320 A1 WO 2021193320A1
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Prior art keywords
polarizing plate
polarizer
display device
pva
image display
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PCT/JP2021/010962
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English (en)
French (fr)
Japanese (ja)
Inventor
拓実 井ノ原
尾込　大介
直之 松尾
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日東電工株式会社
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Priority to KR1020227031132A priority Critical patent/KR20220131548A/ko
Priority to CN202180024461.0A priority patent/CN115398287A/zh
Publication of WO2021193320A1 publication Critical patent/WO2021193320A1/ja

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/38—Removing material by boring or cutting
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources

Definitions

  • the present invention relates to a polarizing plate, a method for producing the same, and an image display device using the polarizing plate.
  • a polarizing plate is often arranged on at least one side of a display cell due to the image forming method.
  • the polarizing plate has a problem of durability that the optical characteristics of the polarizer, which substantially controls the optical characteristics of the polarizing plate, are lowered in a high temperature and high humidity environment. More specifically, the polarizing element may lose its polarization performance at the end in a high temperature and high humidity environment, and as a result, a phenomenon of so-called color loss may occur.
  • narrower frames in some cases, so-called bezel-less
  • the present invention has been made to solve the above-mentioned conventional problems, and its main purpose is to maintain excellent optical characteristics even in a high temperature and high humidity environment and prevent color loss, and a simple polarizing plate thereof.
  • the purpose is to provide a manufacturing method.
  • the polarizing plate according to the embodiment of the present invention is a single-wafered polarizing element made of a polyvinyl alcohol-based resin film containing a dichroic substance, and a protective layer arranged on at least one side of the polarizing element.
  • a polyenized portion is formed at the end of the polarizer.
  • the polyeneized portion is formed from the outer peripheral end of the polarizer to a position of 25 ⁇ m or more inward in the plane direction.
  • the polyeneized portion is formed from the outer peripheral end of the polarizer to a position of 1000 ⁇ m or less inward in the plane direction.
  • the polarizing plate is formed with a sealing portion that covers the outer peripheral end face.
  • the sealing portion is a melt-solidified resin film constituting the protective layer.
  • a method for manufacturing the above-mentioned polarizing plate includes cutting the end portion of the polarizing plate by laser irradiation; or irradiating the end face of the polarizing plate with an electron beam and then heating the irradiated portion.
  • an image display device is provided.
  • the image display device includes a display cell and the above-mentioned polarizing plate arranged on at least one side of the display cell.
  • a polarizing plate that maintains excellent optical characteristics even in a high temperature and high humidity environment and prevents color loss is provided. obtain.
  • FIG. 1 is a schematic cross-sectional view of a polarizing plate according to one embodiment of the present invention
  • FIG. 2 is a schematic plan view of a polarizer in the polarizing plate of FIG.
  • the polarizing plate 100 has a single-wafer shape, and has a polarizer 10, a first protective layer 20 arranged on one side of the polarizer 10, and a second protective layer arranged on the other side of the polarizer 10. Has 30 and. Either the first protective layer 20 or the second protective layer 30 may be omitted depending on the purpose and the like.
  • the polarizer 10 is made of a polyvinyl alcohol (PVA) -based resin film containing a dichroic substance (typically iodine or a dichroic dye).
  • a polyeneized portion 40 is formed at the end of the polarizer 10.
  • the polyene-ized portion 40 is a portion in which a polarizer (substantially, a PVA-based resin) is polyene-ized. More specifically, the polyene unit is, PVA system refers to three or more double bonds are formed partially by thermal decomposition in the resin, in the absorption spectrum of the Raman spectrometric measurement 1134 / cm -1 and 1527 / cm - It can be confirmed by the appearance of a peak at 1. Since polyene formation of a polarizer reduces or eliminates polarization performance, it is common general knowledge in the art that suppression or prevention of polyene formation of a polarizer is preferable.
  • a polarizer substantially, a PVA-based resin
  • the present inventors have surprisingly achieved high temperature and high temperature by intentionally polyeneizing the polarizer.
  • color loss in a moist environment can be remarkably suppressed, and have completed the present invention.
  • the present invention is based on a technical idea in a direction completely opposite to the common general technical idea in the industry, and the effect is an unexpectedly excellent effect obtained by trial and error based on such a technical idea. Is.
  • the polyeneized portion 40 is formed from the outer peripheral end of the polarizer 10 to a position of, for example, 25 ⁇ m or more.
  • the width W of the polyeneized portion is, for example, 25 ⁇ m or more.
  • the width W of the polyeneized portion is preferably 50 ⁇ m or more, more preferably 100 ⁇ m or more, further preferably 150 ⁇ m or more, particularly preferably 200 ⁇ m or more, and particularly preferably 500 ⁇ m or more.
  • the width W of the polyeneized portion is preferably 1000 ⁇ m or less, more preferably 800 ⁇ m or less, from the viewpoint of preventing adverse effects on the optical characteristics of the polarizer and the display characteristics of the image display device.
  • the width of the polyeneized portion is preferably 1000 ⁇ m or less, more preferably 800 ⁇ m or less, from the viewpoint of preventing adverse effects on the optical characteristics of the polarizer and the display characteristics of the image display device.
  • the single transmittance of the polyeneized portion is preferably 25% to 45%, more preferably 35% to 45%.
  • the degree of polarization of the polyeneized portion is preferably 90% or more, more preferably 98% or more. It is practically difficult to structurally and quantitatively specify the degree of polyene formation in the polyene formation portion, and the single transmittance and the degree of polarization can be indicators of the degree of polyene formation. That is, the degree of deterioration of the polarization performance of the polarizer can be an index of the degree of polyene.
  • the polarizing plate 100 may be formed with a sealing portion 50 that covers the outer peripheral end face.
  • the sealing portion 50 is typically a melt-solidified resin film constituting the first protective layer 20 and / or the second protective layer 30.
  • Moisture permeability of the sealing portion is preferably not more than 300g / m 2 / 24hr, more preferably not more than 100g / m 2 / 24hr, more preferably not more than 50g / m 2 / 24hr, particularly preferably 25g / m 2 / 24hr or less.
  • the lower limit of the moisture permeability for example, 0.01g / m 2 / 24hr, and preferably below the detection limit.
  • the moisture permeability can be measured according to JIS Z0208.
  • the thickness of the sealing portion 50 is preferably 1 ⁇ m to 1000 ⁇ m, more preferably 5 ⁇ m to 300 ⁇ m.
  • the "thickness of the sealing portion" is the thickness in the direction extending outward from the outer peripheral end surface of the polarizing plate, unless otherwise specified.
  • the polarizing plate according to the embodiment of the present invention has a color loss amount of preferably 100 ⁇ m or less, more preferably 50 ⁇ m or less, still more preferably 40 ⁇ m or less after being held in a 65 ° C. and 90% RH environment for 240 hours. It is particularly preferably 30 ⁇ m or less, and particularly preferably 10 ⁇ m or less.
  • the lower limit of the amount of color loss is preferably zero.
  • the amount of color loss can be calculated, for example, as follows: A test piece of a predetermined size having two sides opposite to each other in the direction orthogonal to the stretching direction and the stretching direction is cut out from the polarizing plate (or the polarizer).
  • the stretching direction typically corresponds to the absorption axis direction of the polarizer.
  • the stretching direction may correspond to, for example, the elongated direction of the polarizing plate (conveying direction (MD direction)).
  • the test piece is attached to a non-alkali glass plate of the same size with an adhesive.
  • This is used as a substitute for an image display device.
  • the visible side test piece and the back side test piece are attached to both sides of the glass plate, respectively.
  • the organic EL display device only the visual inspection piece is attached to one side of the glass plate.
  • This image display device substitute is left to heat and humidify in an oven at 65 ° C. and 90% RH for 240 hours.
  • the state of color loss at the edges after heating and humidification is examined with a microscope.
  • the organic EL display device substitute As for the organic EL display device substitute, when the organic EL display device substitute after heating and humidification is placed in the state of the standard polarizing plate and the cross Nicol, the state of color loss at the end is examined with a microscope. In any case, specifically, the size of color loss (color loss amount: ⁇ m) from the end of the test piece (polarizing plate or polarizer) is measured. As shown in FIG. 3, the larger of the color loss amount a from the end portion in the stretching direction and the color loss amount b from the end portion in the direction orthogonal to the stretching direction is defined as the color loss amount. It should be noted that the color-excluded region has extremely low polarization characteristics and does not substantially function as a polarizing plate.
  • the polarizing element is composed of a PVA-based resin film containing a dichroic substance (typically, iodine or a dichroic dye).
  • the dichroic substance is preferably iodine.
  • the polarizer may be formed of a single-layer resin film or may be formed of a laminate of two or more layers.
  • the polarizer formed from the 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 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.
  • the PVA-based film is subjected to a swelling treatment, a cross-linking treatment, a washing treatment, a drying treatment and the like. For example, by immersing the PVA-based film in water and washing it with water before dyeing, it is possible not only to clean the dirt on the surface of the PVA-based film and the blocking inhibitor, but also to swell the PVA-based film to prevent uneven dyeing. Can be prevented.
  • 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 base material / polarizer laminate may be used as it is (that is, the resin base material may be used as a protective film for the polarizer), or the resin base material is peeled off from the resin base material / polarizer laminate. Then, any suitable protective film 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 entire description of these publications is incorporated herein by reference.
  • any suitable resin can be adopted as the PVA-based resin that forms the PVA-based resin film.
  • polyvinyl alcohol and ethylene-vinyl alcohol copolymer can be mentioned.
  • Polyvinyl alcohol is obtained by saponifying polyvinyl acetate.
  • the ethylene-vinyl alcohol copolymer is obtained by saponifying the ethylene-vinyl acetate copolymer.
  • the saponification degree of the PVA-based resin is usually 85 mol% to 100 mol%, preferably 95.0 mol% to 99.9 mol%, and more preferably 99.0 mol% to 99.5 mol%. ..
  • the degree of saponification can be determined according to JIS K 6726-1994. By using a PVA-based resin having such a saponification degree, a polarizer having excellent durability can be obtained. If the degree of saponification is too high, gelation may occur.
  • the average degree of polymerization of the PVA-based resin can be appropriately selected according to the purpose.
  • the average degree of polymerization is usually 1000 to 10000, preferably 1200 to 5000, and more preferably 1500 to 4500.
  • the average degree of polymerization can be determined according to JIS K 6726-1994.
  • the iodine concentration in the PVA-based resin film (polarizer) is, for example, 5.0% by weight to 12.0% by weight.
  • the boric acid concentration in the PVA-based resin film is, for example, 12% by weight to 25% by weight.
  • the thickness of the polarizer is, for example, 12 ⁇ m or less, preferably 8 ⁇ m or less, more preferably 7 ⁇ m or less, still more preferably 6 ⁇ m or less. On the other hand, the thickness of the polarizer is preferably 1 ⁇ m or more, more preferably 2 ⁇ m or more.
  • the polarizer preferably exhibits absorption dichroism at any wavelength of 380 nm to 780 nm.
  • the simple substance transmittance of the polarizer (excluding the polyeneized portion) is preferably 40.0% to 46.0%, more preferably 40.5% to 43.0%.
  • the degree of polarization of the polarizer (excluding the polyeneized portion) is preferably 99.9% or more, more preferably 99.95% or more, and further preferably 99.98% or more.
  • the first and second protective layers are 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
  • thermosetting resins such as (meth) acrylic, urethane, (meth) acrylic urethane, epoxy, and silicone, or ultraviolet curable resins can also be mentioned.
  • a vitreous polymer such as a siloxane-based polymer 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 thickness of the protective layer (outer protective layer) arranged on the side opposite to the display cell is typically 300 ⁇ m or less, preferably 100 ⁇ m or less, more preferably 100 ⁇ m or less. It is 5 ⁇ m to 80 ⁇ m, 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 thickness of the protective layer (inner protective layer) arranged on the display cell side when the polarizing plate 100 is applied to the image display device is preferably 5 ⁇ m to 200 ⁇ m, more preferably 10 ⁇ m to 100 ⁇ m, and further preferably 10 ⁇ m to 60 ⁇ m. be.
  • the inner protective layer 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. say.
  • the inner protective layer is a retardation layer having any suitable retardation value.
  • the in-plane retardation Re (550) of the retardation layer is, for example, 110 nm to 150 nm, and the angle formed by the slow axis thereof and the absorption axis of the polarizer is, for example, 40 ° to 50 °.
  • 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, phase-advance). It is the refractive index in the axial direction), “nz” is the refractive index in the thickness direction, and “d” is the thickness (nm) of the layer (film).
  • the manufacturing method includes cutting the end portion of the polarizing plate by laser irradiation.
  • a polyeneized portion 40 can be formed at the end portion (that is, the cut portion), and the sealing portion 50 can also be formed at the same time. More specifically, when the end portion of the polarizing plate is cut by laser irradiation, the laser-irradiated portion of the polarizer is thermally decomposed to form a polyene.
  • the laser-irradiated portion exists in both the cut portion of the polarizer and the polarizer remaining after cutting, and the polarizer remaining after cutting has a polyene at the end of the polarizer because the end portion thereof becomes the laser-irradiated portion. A conversion part is formed.
  • the laser irradiation melts the protective layer (substantially, the resin film constituting the protective layer) of the irradiated portion, and the molten resin flows to cover the end face of the polarizing plate and then solidifies. As a result, a sealing portion made of a melt-solidified resin film constituting the protective layer is formed.
  • Examples of the laser light source that can be used for laser irradiation include an infrared laser including a CO 2 laser light source in which the wavelength of the oscillating laser light is 9 ⁇ m to 11 ⁇ m in the infrared region.
  • Infrared lasers can easily obtain power of several tens of watts, and further, by efficiently generating heat by molecular vibration accompanying infrared absorption of a polarizing plate (substantially, a polarizing element), a phase transition of a substance is performed. It is possible to cause the etching that accompanies.
  • a laser light source that can be used for laser irradiation is a CO laser light source in which the wavelength of the oscillating laser light is in the vicinity of 5 ⁇ m.
  • a laser light source is a near infrared (NIR), visible light (Vis) and ultraviolet (UV) pulsed laser light source.
  • NIR near infrared
  • Vis and UV pulse laser light sources the wavelength of the oscillating laser light is 1064 nm, 532 nm, 355 nm, 349 nm or 266 nm (Nd: YAG, Nd: YLF, or YVO 4 as a medium).
  • an excimer laser light source having an oscillating laser light wavelength of 351 nm, 248 nm, 222 nm, 193 nm or 157 nm, and an F 2 laser light source having an oscillating laser light wavelength of 157 nm can be exemplified.
  • pulse oscillation is preferable to continuous wave (CW) from the viewpoint of suppressing excessive thermal damage of the polarizer.
  • the pulse width can be appropriately set in the range of 10 femtoseconds (10-14 seconds) to 1 millisecond ( 10-3 seconds). It is also possible to set two or more types of pulse widths for processing.
  • There are no restrictions on the polarization state of the laser light and linearly polarized light, circularly polarized light, and randomly polarized light can be applied.
  • a Gaussian beam that exhibits good light-collecting property, can be made into small spots, and is expected to improve productivity is preferable. It may be shaped into a flat top beam using a diffractive optical element or the like.
  • the irradiation conditions of the laser light can be set to any suitable conditions.
  • the pulse energy is preferably 2.67 mJ to 6.67 mJ, more preferably 4.00 mJ to 6.00 mJ.
  • the scanning speed is preferably 100 mm / sec to 1000 mm / sec, more preferably 250 mm / sec to 700 mm / sec.
  • the repetition frequency is, for example, 5 kHz to 30 Hz.
  • the input energy of the pulse laser is preferably 80,000 ⁇ J / mm to 200,000 ⁇ J / mm, and more preferably 120,000 ⁇ J / mm to 180,000 ⁇ J / mm.
  • the laser light irradiation form can be appropriately set according to the purpose.
  • the laser light may be scanned in a linear shape, in an S shape, in a spiral shape, or in combination thereof, for example.
  • the degree and width of the polyene formation of the polyene formation portion, the thickness of the sealing portion, and the like can be adjusted.
  • the manufacturing method includes irradiating the end face of the polarizing plate with an electron beam and then heating the irradiated portion.
  • the electron beam can typically irradiate the end face of the polarizing plate.
  • the processing speed is preferably 1 m / min to 10 m / min, more preferably 2 m / min to 5 m / min.
  • the beam current is preferably 5 mA to 30 mA, more preferably 12.5 mA to 17.5 mA.
  • the efficiency coefficient K of electron beam irradiation is preferably 60 to 130, and more preferably 80 to 120.
  • the efficiency coefficient is a numerical value determined by the acceleration voltage, but the correspondence between the acceleration voltage and the efficiency coefficient differs for each device.
  • the dose of the electron beam is preferably 200 kGy to 1000 kGy, more preferably 250 kGy to 500 kGy.
  • the heating temperature is preferably 80 ° C. or higher, more preferably 90 ° C. to 130 ° C., and even more preferably 100 ° C. to 120 ° C.
  • the heating time is preferably 10 hours or more, more preferably 15 hours to 30 hours, and even more preferably 22 hours to 26 hours. Under such heating conditions, a polyene-formed portion having a desired degree of polyeneization and width and a sealing portion having a desired thickness can be formed.
  • the polarizing plate according to the above items A and B can be applied to an image display device. Therefore, such an image display device is also included in the embodiment of the present invention.
  • the image display device includes a display cell and the polarizing plate according to items A and B arranged on at least one side of the display cell. Examples of the image display device include a liquid crystal display device and an organic electroluminescence (EL) display device. Since the configuration of the image display device is well known in the industry, detailed description thereof will be omitted.
  • Example 1 Fabrication of Polarizer
  • a thermoplastic resin base material an amorphous isophthal copolymer polyethylene terephthalate film (thickness: 100 ⁇ m) having a Tg of about 75 ° C. was used, and one side of the resin base material was treated with corona. Was given. 100 parts by weight of PVA-based resin in which polyvinyl alcohol (degree of polymerization 4200, degree of saponification 99.2 mol%) and acetoacetyl-modified PVA (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "Gosefimmer”) are mixed at a ratio of 9: 1.
  • a PVA aqueous solution (coating solution) was prepared by dissolving 13 parts by weight of potassium iodide in water.
  • the PVA aqueous solution was applied to the corona-treated surface of the resin base material and dried at 60 ° C. to form a PVA-based resin layer having a thickness of 13 ⁇ m to prepare a laminate.
  • the obtained laminate was uniaxially stretched 2.4 times in the longitudinal direction (longitudinal direction) in an oven at 130 ° C. (aerial auxiliary stretching treatment). Next, the laminate was immersed in an insolubilizing bath at a liquid temperature of 40 ° C.
  • a cycloolefin-based film (manufactured by ZEON Corporation, 17 ⁇ m) is applied as a protective layer on the surface of the polarizer obtained above (the surface opposite to the resin substrate) via an ultraviolet curable adhesive. And pasted together. Specifically, the curable adhesive was coated so as to have a total thickness of about 1.0 ⁇ m, and bonded using a roll machine. Then, UV light was irradiated from the cycloolefin film side to cure the adhesive. Next, an acrylic film (manufactured by Toyo Kohan Co., Ltd., 40 ⁇ m) was attached to the exposed surface of the polarizer by peeling off the resin base material in the same manner as described above. In this way, a polarizing plate having a cycloolefin-based film (protective layer) / polarizer / acrylic-based film (protective layer) was obtained.
  • the polarizing plate was heated at 105 ° C. for 24 hours to form a polyeneized portion at the end of the polarizer.
  • the width of the polyeneized portion was 250 ⁇ m.
  • the width of the polyeneized portion was measured from an image taken with a microscope. As described above, a polarizing plate on which the polyeneized portion was formed was produced.
  • Two polarizing plates on which the polyeneized portion obtained above was formed were prepared, and these were used as test pieces.
  • Two test pieces were bonded to both sides of a non-alkali glass plate of the same size with an adhesive to prepare a laminated body of a visual side test piece / glass plate / back side test piece, which was used as a substitute for an image display device.
  • the visible side test piece and the back side test piece were attached to a glass plate so that the absorption axes of the respective polarizers were orthogonal to each other.
  • the image display device substitute was left in an oven at 65 ° C.
  • Example 2 A polarizing plate in which the polyeneized portion was formed was produced in the same manner as in Example 1 except that the polyeneized portion was formed as follows. The width of the polyeneized portion was 30 ⁇ m. It was also confirmed that the sealing portion was formed at the same time as the formation of the polyeneized portion. Moisture permeability of the sealing portion is 18g / m 2 / 24hr, the thickness was about 13 .mu.m. With respect to the obtained polarizing plate, the amount of color loss was measured in the same manner as in Example 1. The results are shown in Table 1.
  • a 20 cm ⁇ 30 cm polarizing plate is prepared, and by irradiating the central portion of the polarizing plate with pulsed laser light, a 50 mm ⁇ 50 mm size single-wafer shape having two sides opposite to each other in the stretching direction and the stretching direction.
  • the polarizing plate was cut out.
  • the laser light irradiation conditions were an output of 85 W, a pulse frequency of 15 kHz, and a processing speed of 15 mm / s.
  • Example 1 A polarizing plate was produced in the same manner as in Example 1 except that neither electron beam irradiation nor subsequent heat treatment was performed. No polyene formation was formed on the polarizing plate. With respect to the obtained polarizing plate, the amount of color loss was measured in the same manner as in Example 1. The results are shown in Table 1.
  • Example 2 A polarizing plate was produced in the same manner as in Example 1 except that the heat treatment after the electron beam irradiation was not performed. No polyene formation was formed on the polarizing plate. With respect to the obtained polarizing plate, the amount of color loss was measured in the same manner as in Example 1. The results are shown in Table 1.
  • the polarizing plate according to the embodiment of the present invention is suitably used for an image display device (for example, a liquid crystal display device, an organic EL display device, a quantum dot display device).
  • an image display device for example, a liquid crystal display device, an organic EL display device, a quantum dot display device.
  • Polarizer 10 Polarizer 20 First protective layer 30 Second protective layer 40 Polyene conversion part 50 Sealing part 100 Polarizing plate

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  • Optics & Photonics (AREA)
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  • Manufacturing & Machinery (AREA)
  • Plasma & Fusion (AREA)
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  • Electroluminescent Light Sources (AREA)
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PCT/JP2021/010962 2020-03-26 2021-03-18 偏光板およびその製造方法、ならびに該偏光板を用いた画像表示装置 WO2021193320A1 (ja)

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JP2009037228A (ja) * 2007-07-06 2009-02-19 Nitto Denko Corp 偏光板
JP2009294649A (ja) * 2008-05-07 2009-12-17 Nitto Denko Corp 偏光板、およびその製造方法
JP2011248192A (ja) * 2010-05-28 2011-12-08 Konica Minolta Opto Inc ロール状偏光板、枚葉状偏光板、及びそれを用いた液晶表示装置
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