WO2017221638A1 - 偏光板セット - Google Patents

偏光板セット Download PDF

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Publication number
WO2017221638A1
WO2017221638A1 PCT/JP2017/019837 JP2017019837W WO2017221638A1 WO 2017221638 A1 WO2017221638 A1 WO 2017221638A1 JP 2017019837 W JP2017019837 W JP 2017019837W WO 2017221638 A1 WO2017221638 A1 WO 2017221638A1
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Prior art keywords
polarizing plate
polarizer
adhesive layer
sensitive adhesive
pressure
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PCT/JP2017/019837
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English (en)
French (fr)
Japanese (ja)
Inventor
白石　貴志
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住友化学株式会社
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Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Priority to KR1020197000590A priority Critical patent/KR102412245B1/ko
Priority to CN201780038092.4A priority patent/CN109313306B/zh
Publication of WO2017221638A1 publication Critical patent/WO2017221638A1/ja

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors

Definitions

  • the present invention relates to a polarizing plate set that can be used for various optical applications.
  • Patent Document 1 discloses a liquid crystal panel in which polarizers are arranged on the front side and the back side of a liquid crystal cell.
  • Patent Document 2 discloses an optical laminate that is disposed on the front side and the back side of a liquid crystal cell. According to the liquid crystal panel disclosed in Patent Document 1 and the optical laminate disclosed in Patent Document 2, the relationship between the thickness of the polarizing film disposed on the front side and the thickness of the polarizing film disposed on the back side is specified. Therefore, attempts have been made to reduce the warpage of the liquid crystal panel.
  • the liquid crystal panel may be peeled off from the touch panel or the backlight unit may be dropped due to warpage of the liquid crystal panel in a humid heat environment.
  • problems such as.
  • an object of the present invention is to provide a polarizing plate set capable of suppressing the warpage of the liquid crystal panel in a humid heat environment as well as the warpage of the liquid crystal panel in a high temperature environment.
  • a polarizing plate set including a back side polarizing plate disposed on one surface side of the liquid crystal cell and a front side polarizing plate disposed on the other surface side,
  • the back side polarizing plate has a reflective polarizing plate, a first pressure-sensitive adhesive layer, a first polarizer, a first protective film, and a second pressure-sensitive adhesive layer.
  • the front side polarizing plate has a third pressure-sensitive adhesive layer, a second polarizer, and a second protective film
  • a difference dF ⁇ dR obtained by subtracting the thickness dR ( ⁇ m) of the first polarizer in the back-side polarizing plate from the thickness dF ( ⁇ m) of the second polarizer in the front-side polarizing plate is defined as ⁇ d ( ⁇ m).
  • 0 ⁇ m ⁇ d ⁇ 5 ⁇ m The angle formed by the absorption axis of the second polarizer in the front-side polarizing plate and the absorption axis of the first polarizer in the rear-side polarizing plate is 90 ° ⁇ 1 °.
  • Polarizing plate set is 90 ° ⁇ 1 °.
  • the pair of polarizing plates is the polarizing plate set according to any one of [1] to [3],
  • the second protective film, the second polarizer, the third pressure-sensitive adhesive layer, the liquid crystal cell, the second pressure-sensitive adhesive layer, the first protective film, the first polarizer, the first pressure-sensitive adhesive layer, and the reflection A liquid crystal panel in which type polarizing plates are laminated in this order.
  • a polarizing plate set comprising a back side polarizing plate disposed on one surface side of the liquid crystal cell and a front side polarizing plate disposed on the other surface side,
  • the back side polarizing plate has a reflective polarizing plate, a first pressure-sensitive adhesive layer, a first polarizer, a first protective film, and a second pressure-sensitive adhesive layer.
  • the front side polarizing plate has a third pressure-sensitive adhesive layer, a second polarizer, and a second protective film
  • a difference dF ⁇ dR obtained by subtracting the thickness dR ( ⁇ m) of the first polarizer in the back-side polarizing plate from the thickness dF ( ⁇ m) of the second polarizer in the front-side polarizing plate is defined as ⁇ d ( ⁇ m).
  • 0 ⁇ m ⁇ d ⁇ 5 ⁇ m The angle formed by the absorption axis of the second polarizer in the front-side polarizing plate and the absorption axis of the first polarizer in the rear-side polarizing plate is 90 ° ⁇ 1 °. It is a polarizing plate set.
  • the liquid crystal panel provided with the set of polarizing plates of the present invention it is possible to prevent the liquid crystal panel from peeling off the touch panel or the backlight unit from falling off, and to obtain a display device with small display unevenness. it can.
  • the polarizing plate set of the present invention includes a back side polarizing plate 10 disposed on one surface side of the liquid crystal cell 30 and a front side polarizing plate 20 disposed on the other surface side.
  • the back side polarizing plate 10 includes a reflective polarizing plate 11, a first pressure-sensitive adhesive layer 12, a first polarizer 13, a first protective film 14, and a second pressure-sensitive adhesive layer 15.
  • the back side polarizing plate 10 can have an additional layer if desired.
  • the back side polarizing plate 10 includes a reflective polarizing plate 11, a first pressure-sensitive adhesive layer 12, a first polarizer 13, a first protective film 14, and a second pressure-sensitive adhesive layer 15. It is the polarizing plate laminated
  • the front side polarizing plate 20 includes a third pressure-sensitive adhesive layer 21, a second polarizer 22, and a second protective film 23.
  • the front side polarizing plate 20 may have further layers as desired.
  • the front-side polarizing plate 20 is a polarizing plate in which a third pressure-sensitive adhesive layer 21, a second polarizer 22, and a second protective film 23 are laminated in this order.
  • the front side polarizing plate 20 may further have a protective film between the third pressure-sensitive adhesive layer 21 and the second polarizer 22 (not shown). That is, the front side polarizing plate 20 may have protective films on both surfaces of the second polarizer 22.
  • the back surface side polarizing plate in this invention is bonded by the surface on the opposite side to the surface at the side of visual recognition of a liquid crystal cell, for example.
  • the back-side polarizing plate may be bonded to the liquid crystal cell so as to be adjacent to a light source provided in the liquid crystal panel, such as a backlight.
  • a narrow double-sided tape may be attached to the edge of the back polarizing plate, and the backlight unit may be attached.
  • the front side polarizing plate in this invention is bonded by the surface at the side of visual recognition of a liquid crystal cell, for example.
  • the polarizing plate set shown in FIG. 1, that is, the back side polarizing plate 10 and the front side polarizing plate 20 may be provided with a layer other than the above-described layers.
  • the polarizers 13 and 22 and the protective films 14 and 23 are usually bonded together via an adhesive layer.
  • the thickness of the second polarizer in the front side polarizing plate 20 is dF
  • the thickness of the first polarizer in the back side polarizing plate 10 is dR
  • the difference dF ⁇ dR obtained by subtracting the thickness dR ( ⁇ m) of the first polarizer in the rear polarizing plate 10 from the thickness dF ( ⁇ m) of the second polarizer in the side polarizing plate 20 is ⁇ d ( ⁇ m)
  • It has a relationship of 0 ⁇ m ⁇ d ⁇ 5 ⁇ m, more preferably a relationship of 1 ⁇ m ⁇ d ⁇ 5 ⁇ m.
  • ⁇ d ( ⁇ m) which is the difference obtained by subtracting the thickness dR from the thickness dF, is within such a range
  • the laminate (liquid crystal panel) of the front side polarizing plate, glass (liquid crystal cell), and back side polarizing plate can be obtained. Even when exposed to high temperature (for example, 85 ° C., humidity 5%) for a long time, the amount of warpage of the laminate is small. Furthermore, even if the laminated body of the front-side polarizing plate, the glass, and the rear-side polarizing plate is placed in a wet heat environment (for example, 60 ° C., humidity 90%), the warpage of the laminated body is suppressed.
  • a wet heat environment for example, 60 ° C., humidity 90%
  • the laminate including the polarizing plate set of the present invention has a small amount of warping when placed in a wet heat environment and a high temperature environment, and thus has a wet heat resistance and a heat resistance, and from a touch panel in a high temperature environment and a wet heat environment. It is thought that there will be no peeling off of the backlight unit or falling off of the backlight unit. In addition, display unevenness caused by warping after the high temperature environment and wet heat environment test is reduced. Further, since ⁇ d ( ⁇ m) has such a relationship, the polarizing plate set of the present invention can be applied to liquid crystal panels having various sizes and thicknesses. In the present specification, the high temperature environment is described as an example of a temperature of 85 ° C.
  • the high temperature environment may mean an environment where the polarizing plate or the like is exposed to, for example, a temperature of 70 ° C. to 95 ° C. and a humidity of 0% to 20% for at least 30 to 60 minutes.
  • the wet heat environment is described under the conditions of a temperature of 60 ° C. and a humidity of 90%.
  • the moist heat environment may mean an environment where the polarizing plate or the like is exposed to a temperature of 50 ° C. to 80 ° C. and a humidity of 60% to 95% for at least 30 minutes to 60 minutes.
  • the thickness dR of the first polarizer of the back side polarizing plate is 15 ⁇ m or less, and more preferably 0.1 ⁇ m or more and 13 ⁇ m or less. Since the back-side polarizing plate has a reflective polarizing plate, the back-side polarizing plate can be made thinner as the first polarizer is thinner.
  • Measurement of each thickness of the polarizing plate set in the present invention can be performed using a measurement method known in the technical field.
  • the angle formed by the absorption axis of the second polarizer in the front-side polarizing plate and the absorption axis of the first polarizer in the rear-side polarizing plate is 90 ° ⁇ 1 °, more preferably 90 ° ⁇ 0. .5 ° range.
  • FIG. 2 is a diagram illustrating the relationship between the absorption axes of the polarizers according to one embodiment of the present invention.
  • the absorption axis of the first polarizer in the back side polarizing plate 10 is represented by 10a
  • the transmission axis of the first polarizer is represented by 10b
  • the long side of the back side polarizing plate is indicated by 10c.
  • the absorption axis of the second polarizer of the front side polarizing plate 20 is represented by 20a
  • the transmission axis of the second polarizer is represented by 20b.
  • the angle formed between the absorption axis 10a of the first polarizer and the absorption axis 20a of the second polarizer is 90 ° ⁇ 1 ° as described above.
  • This angle can be represented, for example, as an angle ⁇ in FIG.
  • the angle formed by the absorption axis of the first polarizer in the back side polarizing plate and the long side of the back side polarizing plate (first polarizer) is 0 ° ⁇ 1 °.
  • the angle formed above is 0 ° ⁇ 0.5 °.
  • the absorption axis of the second polarizer in the front side polarizing plate may be described as the absorption axis of the front side polarizing plate, and the absorption axis of the first polarizer in the back side polarizing plate may be It may be the absorption axis of the back side polarizing plate.
  • a difference dF ⁇ dR obtained by subtracting the thickness dR ( ⁇ m) of the first polarizer in the back side polarizing plate from the thickness dF ( ⁇ m) of the second polarizer in the front side polarizing plate is obtained. If ⁇ d ( ⁇ m), By satisfying 0 ⁇ m ⁇ d ⁇ 5 ⁇ m, for example, even if a liquid crystal panel having a front side polarizing plate, a glass plate, and a back side polarizing plate is exposed to a humid heat environment under high temperature conditions, these warpages can be suppressed.
  • a polarizing plate for example, a reflective polarizing plate, a 1st adhesive layer, a 1st polarizer, a 1st protective film, and 2nd
  • the pressure-sensitive adhesive layer can warp together.
  • the third pressure-sensitive adhesive layer, the second polarizer and the second protective film can warp together. Therefore, the back side polarizing plate and the front side polarizing plate in the present invention usually cannot cause delamination between at least one of these layers.
  • warp may occur in either one of the back side polarizing plate and the front side polarizing plate, and both the back side polarizing plate and the front side polarizing plate may warp.
  • Such warpage can be evaluated by measuring the amount of warpage in the present invention.
  • the warpage amount may be evaluated by measuring the warpage amount under wet heat conditions, or may be evaluated by measuring the warpage amount under high temperature conditions.
  • the third pressure-sensitive adhesive on the front side polarizing plate and the second pressure-sensitive adhesive layer on the back side polarizing plate are bonded to the front and back of the glass panel, and the environment is 60 ° C. and humidity is 90%. After standing for 250 hours, the glass panel was placed with the back side polarizing plate facing down, and the relative height of lifting from the horizontal surface of the measurement table was measured.
  • the third pressure-sensitive adhesive on the front-side polarizing plate and the second pressure-sensitive adhesive layer on the rear-side polarizing plate are bonded to the front and back of the glass panel, and the environment is 85 ° C. and humidity is 5%.
  • a glass panel was installed so that the back side polarizing plate would be down, and the relative height of lifting from the horizontal surface of the measuring table was measured.
  • the reflective polarizing plate is also called a brightness enhancement film, and a polarization conversion element having a function of separating light emitted from a light source (backlight) into transmitted polarized light and reflected polarized light or scattered polarized light is used.
  • a polarization conversion element having a function of separating light emitted from a light source (backlight) into transmitted polarized light and reflected polarized light or scattered polarized light is used.
  • the reflective polarizing plate and the polarizer is laminated in contact with the first pressure-sensitive adhesive layer.
  • the reflective polarizing plate can be, for example, an anisotropic reflective polarizer.
  • An example of the anisotropic reflective polarizer is an anisotropic multiple thin film that transmits linearly polarized light in one vibration direction and reflects linearly polarized light in the other vibration direction, and a specific example thereof is DBEF manufactured by 3M. (Japanese Patent Laid-Open No. 4-268505).
  • Such a reflective polarizing plate is a reflective polarizing plate formed by stretching a multilayer laminate composed of at least two thin films having different refractive index anisotropies. Therefore, such a reflective polarizing plate has at least two thin films, and the stretched at least two thin films have different refractive index anisotropy.
  • anisotropic reflective polarizer is a composite of a cholesteric liquid crystal layer and a ⁇ / 4 plate, and a specific example thereof is a PCF manufactured by Nitto Denko Corporation (JP-A-11-231130, etc.).
  • an anisotropic reflective polarizer is a reflective grid polarizer, a specific example of which is a metal grid reflective polarizer (US) that emits reflected polarized light even in the visible light region by finely processing the metal.
  • US metal grid reflective polarizer
  • Patent No. 6288840 and the like discloses a film obtained by adding metal fine particles into a polymer matrix and stretching.
  • An optical layer such as a hard coat layer, an antiglare layer, a light diffusion layer, or a retardation layer having a retardation value of 1 ⁇ 4 wavelength is provided on the surface of the reflective polarizing plate opposite to the first pressure-sensitive adhesive layer. May be.
  • the thickness of the reflective polarizing plate can be about 5 to 100 ⁇ m, but is preferably 10 to 40 ⁇ m, more preferably 10 to 30 ⁇ m from the viewpoint of reducing warpage as a liquid crystal panel.
  • the surface of the reflective polarizing plate on the first pressure-sensitive adhesive layer side can be subjected to a surface activation treatment.
  • This surface activation treatment is performed prior to bonding of the reflective polarizing plate and the first pressure-sensitive adhesive layer.
  • the surface activation treatment can be a surface hydrophilization treatment, and may be a dry treatment or a wet treatment.
  • the dry treatment include discharge treatment such as corona treatment, plasma treatment and glow discharge treatment; flame treatment; ozone treatment; UV ozone treatment; ionizing active ray treatment such as ultraviolet treatment and electron beam treatment.
  • the wet treatment include ultrasonic treatment using a solvent such as water or acetone, alkali treatment, anchor coat treatment, and the like. These processes may be performed alone or in combination of two or more.
  • the surface activation treatment is preferably a corona treatment and / or a plasma treatment from the viewpoint of the effect of suppressing peeling of the reflective polarizing plate in a humid heat environment and the productivity of the polarizing plate.
  • a corona treatment and / or a plasma treatment from the viewpoint of the effect of suppressing peeling of the reflective polarizing plate in a humid heat environment and the productivity of the polarizing plate.
  • a surface activation treatment may also be performed on the surface of the first pressure-sensitive adhesive layer on the luminance reflective polarizing plate side.
  • the first pressure-sensitive adhesive layer is a layer interposed between the first polarizer and the reflective polarizing plate.
  • the first pressure-sensitive adhesive layer is typically directly laminated on the polarizer so that the first polarizer and the first pressure-sensitive adhesive layer are in contact with each other.
  • the first pressure-sensitive adhesive layer can be composed of a pressure-sensitive adhesive composition whose main component is a resin such as acrylic, rubber-based, urethane-based, ester-based, silicone-based, or polyvinyl ether-based.
  • a pressure-sensitive adhesive composition having an acrylic resin excellent in transparency, weather resistance, heat resistance and the like as a base polymer is preferable.
  • the pressure-sensitive adhesive composition may be an active energy ray curable type or a thermosetting type.
  • acrylic base polymer examples include (meth) acrylic acid ester bases such as butyl (meth) acrylate, ethyl (meth) acrylate, isooctyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate. Polymers and copolymer base polymers using two or more of these (meth) acrylic acid esters are preferably used.
  • the base polymer is preferably copolymerized with a polar monomer.
  • polar monomers examples include (meth) acrylic acid, 2-hydroxypropyl (meth) acrylate, hydroxyethyl (meth) acrylate, (meth) acrylamide, N, N-dimethylaminoethyl (meth) acrylate, glycidyl ( Mention may be made of monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group and the like, such as (meth) acrylate.
  • the pressure-sensitive adhesive composition usually further contains a crosslinking agent.
  • a crosslinking agent a metal ion having a valence of 2 or more, which forms a carboxylic acid metal salt with a carboxyl group; a polyamine compound, which forms an amide bond with a carboxyl group; Examples thereof include epoxy compounds and polyols that form ester bonds with carboxyl groups; polyisocyanate compounds that form amide bonds with carboxyl groups. Of these, polyisocyanate compounds are preferred.
  • the active energy ray-curable pressure-sensitive adhesive composition has a property of being cured by irradiation with active energy rays such as ultraviolet rays and electron beams, and has an adhesive property even before irradiation with active energy rays. It is a pressure-sensitive adhesive composition having such a property that it can be adhered to an adherend such as the like and can be cured by irradiation with active energy rays to adjust the adhesion.
  • the active energy ray-curable pressure-sensitive adhesive composition is preferably ultraviolet curable.
  • the active energy ray-curable pressure-sensitive adhesive composition further contains an active energy ray-polymerizable compound in addition to the base polymer and the crosslinking agent. Further, if necessary, a photopolymerization initiator, a photosensitizer and the like may be contained.
  • the pressure-sensitive adhesive composition contains fine particles for imparting light scattering properties; beads; resins other than the base polymer; tackifiers; fillers; antioxidants; ultraviolet absorbers; pigments; be able to.
  • the first pressure-sensitive adhesive layer can be formed by applying an organic solvent diluted solution of the above pressure-sensitive adhesive composition on a substrate and drying it.
  • the substrate can be a polarizer, a reflective polarizing plate, a separator or the like.
  • a desired cured product can be obtained by irradiating the formed pressure-sensitive adhesive layer with active energy rays.
  • the first pressure-sensitive adhesive layer preferably exhibits a storage elastic modulus of 0.15 to 1.2 MPa in a temperature range of 23 to 80 ° C.
  • a storage elastic modulus 0.15 to 1.2 MPa in a temperature range of 23 to 80 ° C.
  • “Shows a storage elastic modulus of 0.15 to 1.2 MPa in a temperature range of 23 to 80 ° C.” means that the storage elastic modulus is a value within the above range at any temperature within this range. . Since the storage elastic modulus usually decreases gradually as the temperature rises, if both the storage elastic modulus at 23 ° C. and 80 ° C. are within the above range, the storage elastic modulus within the above range is exhibited at the temperature in this range. Can be seen.
  • the storage elastic modulus of the first pressure-sensitive adhesive layer can be measured using a commercially available viscoelasticity measuring device, for example, a viscoelasticity measuring device “DYNAMIC ANALYZER RDA II” manufactured by REOMETRI as shown in the examples below. it can.
  • an active energy ray-curable type is further prepared by further adding an oligomer, specifically, a urethane acrylate-based oligomer, to a pressure-sensitive adhesive composition containing a base polymer and a crosslinking agent.
  • the pressure-sensitive adhesive composition preferably an ultraviolet curable pressure-sensitive adhesive composition
  • the adhesive layer is appropriately cured by irradiating active energy rays.
  • the thickness of the first pressure-sensitive adhesive layer can be 30 ⁇ m or less.
  • the thickness is preferably 25 ⁇ m or less, particularly preferably 20 ⁇ m or less, and particularly preferably 15 ⁇ m or less.
  • the thickness of the 1st adhesive layer exists in such a range, the dimensional change of a polarizing plate can be suppressed, maintaining favorable workability.
  • the thickness of the first pressure-sensitive adhesive layer can be adjusted as appropriate so that the interlayer thickness falls within a predetermined range.
  • a polarizer is an absorptive polarizer that has the property of absorbing linearly polarized light having a vibration plane parallel to the absorption axis and transmitting linearly polarized light having a vibration plane perpendicular to the absorption axis (parallel to the transmission axis). is there.
  • the first polarizer and the second polarizer used in the polarizing plate set of the present invention may be the same polarizer or different polarizers as long as the thicknesses have a predetermined relationship.
  • a polarizing film in which a dichroic dye is adsorbed and oriented on a polyvinyl alcohol resin film can be suitably used.
  • the polarizer is, for example, a step of uniaxially stretching a polyvinyl alcohol resin film; a step of adsorbing a dichroic dye by dyeing the polyvinyl alcohol resin film with a dichroic dye; a polyvinyl on which the dichroic dye is adsorbed It can be produced by a method comprising a step of treating an alcohol-based resin film with a boric acid aqueous solution; and a step of washing with water after the treatment with the boric acid aqueous solution.
  • polyvinyl alcohol resin a saponified polyvinyl acetate resin
  • examples of the polyvinyl acetate resin include, in addition to polyvinyl acetate, which is a homopolymer of vinyl acetate, copolymers with other monomers copolymerizable with vinyl acetate.
  • examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, acrylamides having ammonium groups, and the like.
  • the degree of saponification of the polyvinyl alcohol resin is usually about 85 to 100 mol%, preferably 98 mol% or more.
  • the polyvinyl alcohol-based resin may be modified, and for example, polyvinyl formal or polyvinyl acetal modified with aldehydes may be used.
  • the average degree of polymerization of the polyvinyl alcohol resin is usually about 1000 to 10,000, and preferably about 1500 to 5,000.
  • the average degree of polymerization of the polyvinyl alcohol resin can be determined according to JIS K 6726.
  • a film obtained by forming such a polyvinyl alcohol resin is used as an original film of a polarizer (polarizing film).
  • the method for forming the polyvinyl alcohol-based resin into a film is not particularly limited, and a known method is employed.
  • the thickness of the polyvinyl alcohol-based raw film is not particularly limited, but in order to make the thickness of the polarizer 15 ⁇ m or less, for example, it is preferable to use an original film having a thickness of about 5 to 35 ⁇ m.
  • the uniaxial stretching of the polyvinyl alcohol-based resin film can be performed before, simultaneously with, or after the dyeing of the dichroic dye.
  • this uniaxial stretching may be performed before boric acid treatment or during boric acid treatment. Moreover, you may uniaxially stretch in these several steps.
  • rolls having different peripheral speeds may be uniaxially stretched or may be stretched uniaxially using a hot roll.
  • the uniaxial stretching may be dry stretching in which stretching is performed in the air, or may be wet stretching in which stretching is performed in a state where a polyvinyl alcohol-based resin film is swollen using a solvent.
  • the draw ratio is usually about 3 to 8 times.
  • a method for dyeing a polyvinyl alcohol resin film with a dichroic dye for example, a method of immersing the film in an aqueous solution containing the dichroic dye is employed.
  • the dichroic dye iodine or a dichroic organic dye is used.
  • the polyvinyl alcohol-type resin film performs the immersion process to water before a dyeing process.
  • a method of immersing a polyvinyl alcohol-based resin film in an aqueous solution containing iodine and potassium iodide is usually employed.
  • the iodine content in this aqueous solution can be about 0.01 to 1 part by weight per 100 parts by weight of water.
  • the content of potassium iodide can be about 0.5 to 20 parts by weight per 100 parts by weight of water.
  • the temperature of the aqueous solution can be about 20 to 40 ° C.
  • a method of immersing a polyvinyl alcohol-based resin film in an aqueous solution containing a dichroic organic dye is usually employed.
  • the aqueous solution containing the dichroic organic dye may contain an inorganic salt such as sodium sulfate as a dyeing assistant.
  • the content of the dichroic organic dye in this aqueous solution can be about 1 ⁇ 10 ⁇ 4 to 10 parts by weight per 100 parts by weight of water.
  • the temperature of the aqueous solution can be about 20 to 80 ° C.
  • boric acid treatment after dyeing with a dichroic dye a method of immersing a dyed polyvinyl alcohol-based resin film in a boric acid-containing aqueous solution is usually employed.
  • the boric acid-containing aqueous solution preferably contains potassium iodide.
  • the amount of boric acid in the boric acid-containing aqueous solution can be about 2 to 15 parts by weight per 100 parts by weight of water.
  • the amount of potassium iodide in this aqueous solution can be about 0.1 to 15 parts by weight per 100 parts by weight of water.
  • the temperature of the aqueous solution can be 50 ° C. or higher, for example, 50 to 85 ° C.
  • the polyvinyl alcohol resin film after the boric acid treatment is usually washed with water.
  • the water washing treatment can be performed, for example, by immersing a boric acid-treated polyvinyl alcohol resin film in water.
  • the water washing treatment may be performed with water containing potassium iodide.
  • the water temperature in the water washing treatment is usually about 5 to 40 ° C.
  • a polarizer is obtained by performing a drying process after washing with water.
  • the drying process can be performed using a hot air dryer or a far infrared heater.
  • the thickness of the polarizer is preferably 15 ⁇ m or less, and more preferably 13 ⁇ m or less.
  • the thickness of the polarizer is usually 4 ⁇ m or more.
  • the thickness dR of the first polarizer in the back side polarizing plate is 15 ⁇ m or less.
  • the thickness dF of the second polarizer in the front side polarizing plate is 15 ⁇ m or less, and more preferably 0.1 ⁇ m or more and 13 ⁇ m or less.
  • the thickness of the polarizer can be adjusted as appropriate so that the thickness does not deviate from the scope of the present invention.
  • a 1st protective film is a film laminated
  • a 2nd protective film is a film laminated
  • the first protective film and the second protective film may be the same film or different films.
  • the protective film is a light-transmitting (preferably optically transparent) thermoplastic resin, for example, a polyolefin such as a chain polyolefin resin (polypropylene resin, etc.) or a cyclic polyolefin resin (norbornene resin, etc.).
  • Cellulose resins such as triacetyl cellulose and diacetyl cellulose; Polyester resins such as polyethylene terephthalate and polybutylene terephthalate; Polycarbonate resins; Acrylic resins such as (meth) acrylic resins; Polystyrene resins; Polyvinyl chloride resin; Acrylonitrile butadiene styrene resin; Acrylonitrile styrene resin; Polyvinyl acetate resin; Polyvinylidene chloride resin; Polyamide resin; Polyacetal resin; Modified polyphenylene ether It may be a film made of polyimide resin or the like; system resin; polysulfone resins; poly (ether sulfone) resins; polyarylate resin; polyamide-imide resin. Among them, it is preferable to use a polyolefin resin or an acrylic resin, and it is particularly preferable to use a cyclic polyolefin resin.
  • chain polyolefin resin examples include a homopolymer of a chain olefin such as a polyethylene resin and a polypropylene resin, and a copolymer composed of two or more chain olefins.
  • Cyclic polyolefin-based resin is a general term for resins that are polymerized using cyclic olefins as polymerization units.
  • Specific examples of cyclic polyolefin resins include ring-opening (co) polymers of cyclic olefins, addition polymers of cyclic olefins, copolymers of cyclic olefins and chain olefins such as ethylene and propylene (typically Are random copolymers), graft polymers obtained by modifying them with unsaturated carboxylic acids or derivatives thereof, and hydrides thereof.
  • the protective film according to the present invention contains a cyclic polyolefin resin.
  • Cellulosic resins are those in which some or all of the hydrogen atoms in the hydroxyl groups of cellulose obtained from raw material cellulose such as cotton linter and wood pulp (hardwood pulp, conifer pulp) are substituted with acetyl groups, propionyl groups and / or butyryl groups. Further, it refers to a cellulose organic acid ester or a cellulose mixed organic acid ester. Examples include cellulose acetates, propionic acid esters, butyric acid esters, and mixed esters thereof.
  • the acrylic resin film include a film containing a methyl methacrylate resin.
  • the methyl methacrylate resin is a polymer containing 50% by weight or more of methyl methacrylate units.
  • the content of methyl methacrylate units is preferably 70% by weight or more, and may be 100% by weight.
  • the polymer having a methyl methacrylate unit of 100% by weight is a methyl methacrylate homopolymer obtained by polymerizing methyl methacrylate alone.
  • This methyl methacrylate-based resin is usually a monofunctional monomer mainly composed of methyl methacrylate and a polyfunctional monomer used as necessary, as a radical polymerization initiator and as required. It can be obtained by polymerization in the presence of a chain transfer agent.
  • Monofunctional monomers that can be copolymerized with methyl methacrylate include, for example, ethyl methacrylate, butyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, benzyl methacrylate, 2-ethylhexyl methacrylate, and 2-hydroxy methacrylate.
  • Acrylic acid esters such as: 2- (hydroxymethyl) methyl acrylate, 3- (hydroxyethyl) methyl acrylate, 2- (hydroxymethyl) ethyl acrylate, and 2- (hydroxymethyl) Hydroxyacrylic esters such as butyl acrylate; Unsaturated acids such as methacrylic acid and acrylic acid; Halogenated styrenes such as chlorostyrene and bromostyrene; Substituted styrenes such as vinyltoluene and ⁇ -methylstyrene; Acrylonitrile and methacrylate Examples thereof include unsaturated nitriles such
  • Examples of the polyfunctional monomer that can be copolymerized with methyl methacrylate include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, and tetraethylene glycol di (meth) acrylate.
  • Nonaethylene glycol di (meth) acrylate, and ethylene glycol such as tetradecaethylene glycol (meth) acrylate or the oligomers of both end hydroxyl groups esterified with acrylic acid or methacrylic acid; both ends of propylene glycol or its oligomer Hydroxyl ester of hydroxyl group with acrylic acid or methacrylic acid; neopentyl glycol di (meth) acrylate, hexanediol di (meth) acrylate, and butanediol A hydroxyl group of a dihydric alcohol such as (meth) acrylate esterified with acrylic acid or methacrylic acid; bisphenol A, an alkylene oxide adduct of bisphenol A, or both hydroxyl groups of these halogen-substituted products are acrylic acid or methacrylic acid Esterified with polyhydric alcohols such as trimethylolpropane and pentaerythritol with acrylic acid or methacryl
  • ethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate and neopentyl glycol dimethacrylate are preferably used.
  • the methyl methacrylate resin may be a modified methyl methacrylate resin modified by performing a reaction between functional groups of the resin.
  • the reaction include, for example, depolymerization condensation in a polymer chain between a methyl ester group of methyl acrylate and a hydroxyl group of methyl 2- (hydroxymethyl) acrylate, and a carboxyl group of acrylic acid and 2- (hydroxymethyl).
  • Intrapolymer dehydration condensation reaction with hydroxyl group of methyl acrylate is a modified methyl methacrylate resin modified by performing a reaction between functional groups of the resin. Examples of the reaction include, for example, depolymerization condensation in a polymer chain between a methyl ester group of methyl acrylate and a hydroxyl group of methyl 2- (hydroxymethyl) acrylate, and a carboxyl group of acrylic acid and 2- (hydroxymethyl).
  • a retardation value of substantially zero means that the in-plane retardation value at a wavelength of 590 nm is 10 nm or less, the absolute value of the thickness direction retardation value at a wavelength of 590 nm is 10 nm or less, and the thickness direction position at a wavelength of 480 to 750 nm.
  • the absolute value of the phase difference value is 15 nm or less.
  • the protective film may be stretched and / or shrunk to give a suitable retardation value.
  • the thickness of the protective film can be about 1 to 30 ⁇ m, but it is preferably 5 to 25 ⁇ m, more preferably 5 to 20 ⁇ m from the viewpoints of strength and handleability. When the thickness is within this range, the polarizer is mechanically protected, and the polarizer does not shrink even when exposed to a humid heat environment, and stable optical characteristics can be maintained. In addition, the thickness of a protective film can be adjusted suitably so that the said interlayer thickness may become a predetermined range.
  • the protective film can be bonded to the polarizer through an adhesive layer.
  • an adhesive layer As the adhesive forming the adhesive layer, a water-based adhesive or an active energy ray-curable adhesive can be used.
  • the water-based adhesive examples include an adhesive made of a polyvinyl alcohol-based resin aqueous solution and an aqueous two-component urethane emulsion adhesive.
  • a water-based adhesive composed of a polyvinyl alcohol-based resin aqueous solution is preferably used.
  • Polyvinyl alcohol resins include vinyl alcohol homopolymers obtained by saponifying polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and other monomers copolymerizable therewith.
  • a polyvinyl alcohol copolymer obtained by saponifying a polymer, a modified polyvinyl alcohol polymer obtained by partially modifying the hydroxyl group thereof, or the like can be used.
  • the water-based adhesive can contain a crosslinking agent such as an aldehyde compound, an epoxy compound, a melamine compound, a methylol compound, an isocyanate compound, an amine compound, or a polyvalent
  • a drying step in order to remove water contained in the water-based adhesive after bonding the polarizer and the protective film.
  • a curing step for curing at a temperature of about 20 to 45 ° C. may be provided.
  • the active energy ray-curable adhesive refers to an adhesive that cures when irradiated with active energy rays such as ultraviolet rays, for example, an adhesive containing a polymerizable compound and a photopolymerization initiator, an adhesive containing a photoreactive resin, Examples thereof include a binder resin and a photoreactive crosslinking agent.
  • the polymerizable compound include photopolymerizable monomers such as a photocurable epoxy monomer, a photocurable acrylic monomer, and a photocurable urethane monomer, and oligomers derived from the photopolymerizable monomer.
  • the photopolymerization initiator examples include those containing substances that generate active species such as neutral radicals, anion radicals, and cation radicals upon irradiation with active energy rays such as ultraviolet rays.
  • active energy ray-curable adhesive containing a polymerizable compound and a photopolymerization initiator an adhesive containing a photocurable epoxy monomer and a cationic photopolymerization initiator can be preferably used.
  • an active energy ray-curable adhesive When using an active energy ray-curable adhesive, after bonding a polarizer and a protective film, a drying step is performed as necessary, and then the active energy ray-curable adhesive is irradiated by irradiating active energy rays. A curing step for curing is performed.
  • the light source of the active energy ray is not particularly limited, but ultraviolet light having a light emission distribution at a wavelength of 400 nm or less is preferable.
  • a wave excitation mercury lamp, a metal halide lamp, etc. can be used.
  • saponification treatment, corona treatment, plasma treatment, or the like can be performed on at least one of the pasting surfaces.
  • the pressure-sensitive adhesive forming the second pressure-sensitive adhesive layer and the third pressure-sensitive adhesive layer conventionally known ones may be appropriately selected, and a high temperature environment, a humid heat environment or an environment where high and low temperatures are repeated are exposed to the polarizing plate. It is sufficient that the adhesive layer has a degree of adhesion that does not cause peeling. Specific examples include acrylic pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, and acrylic pressure-sensitive adhesives are particularly preferable in terms of transparency, weather resistance, heat resistance, and processability.
  • the first pressure-sensitive adhesive layer, the second pressure-sensitive adhesive layer, and / or the third pressure-sensitive adhesive layer may use the same type of pressure-sensitive adhesive, or may use different types of pressure-sensitive adhesives.
  • the second pressure-sensitive adhesive layer and the third pressure-sensitive adhesive layer are formed from an acrylic pressure-sensitive adhesive.
  • a tackifier for the adhesive, if necessary, a tackifier, plasticizer, glass fiber, glass beads, metal powder, other inorganic powders, fillers, pigments, colorants, fillers, antioxidants, UV absorbers Various additives such as an antistatic agent and a silane coupling agent may be appropriately blended.
  • the pressure-sensitive adhesive layer is usually formed by applying a pressure-sensitive adhesive solution onto a release sheet and drying.
  • a pressure-sensitive adhesive solution onto a release sheet and drying.
  • roll coating methods such as reverse coating and gravure coating, spin coating methods, screen coating methods, fountain coating methods, dipping methods, spraying methods and the like can be employed.
  • the release sheet provided with the pressure-sensitive adhesive layer is used by a method of transferring the release sheet.
  • the thickness of the pressure-sensitive adhesive layer is usually about 3 to 30 ⁇ m, preferably 10 to 30 ⁇ m, and more preferably 10 to 25 ⁇ m.
  • the polarizing plate when the second pressure-sensitive adhesive layer and the third pressure-sensitive adhesive layer have such thicknesses, the polarizing plate can be prevented from being broken, and when incorporated in a liquid crystal display device, The occurrence of light leakage can be suppressed.
  • the thickness of a 2nd adhesive layer and a 3rd adhesive layer can be suitably adjusted so that the said interlayer thickness may become a predetermined range.
  • the storage elastic modulus at 80 ° C. of the second pressure-sensitive adhesive layer and the third pressure-sensitive adhesive layer is preferably 0.025 MPa or more, more preferably 0.07 MPa or more. If the storage elastic modulus of the pressure-sensitive adhesive layer is less than 0.025 MPa, the second pressure-sensitive adhesive layer and the third pressure-sensitive adhesive layer may cause cohesive failure, and if the cohesive failure is significant, only the appearance of the polarizing plate is adversely affected. In addition, when incorporated in a liquid crystal display device, light leakage occurs at the end of the liquid crystal panel, which adversely affects the display. Preferably, the storage elastic modulus at 80 ° C.
  • the second pressure-sensitive adhesive layer and the third pressure-sensitive adhesive layer is 1.1 MPa or less, preferably 0.9 MPa or less. If the storage elastic modulus of the pressure-sensitive adhesive layer at 80 ° C. exceeds 1.1 MPa, the heat-resistant durability deteriorates against the second pressure-sensitive adhesive layer, the third pressure-sensitive adhesive layer and the glass or panel, and bubbles are generated between the layers. It becomes easy.
  • a separator may be provided to protect the surface of the second adhesive layer and the third adhesive layer until they are bonded to another member.
  • the back-side polarizing plate of the present invention includes, for example, a step of subjecting the surface on the first pressure-sensitive adhesive layer side of the reflective polarizing plate to a surface activation treatment, and the first surface on the surface subjected to the surface activation treatment. It is produced through a process of laminating an adhesive layer.
  • the back side polarizing plate of this invention is a surface on the opposite side to the 1st polarizer in bonding a 1st protective film through the adhesive bond layer on the single side
  • laminating the second pressure-sensitive adhesive layer, bonding the first pressure-sensitive adhesive layer to the surface of the first polarizer opposite to the first protective film, and the first polarizer in the first pressure-sensitive adhesive layer Includes laminating a reflective polarizing plate on the opposite surface.
  • a separator may be temporarily attached to the outer surface of the second pressure-sensitive adhesive layer, and a surface activation treatment may be performed on the bonding surface of the first pressure-sensitive adhesive layer with the reflective polarizing plate.
  • the method of laminating the reflective polarizing plate to the first pressure-sensitive adhesive layer may be a single wafer laminating method or a sheet / roll composite laminating method as described in JP-A-2004-262071. Also good. In addition, when it can be produced in a long length and the required quantity is large, a roll-to-roll bonding method is also useful.
  • the method for producing the back side polarizing plate of the present invention can be produced by a method known in the technical field.
  • the manufacturing method of the back side polarizing plate of this invention can be produced by a well-known method in the said technical field.
  • the front-side polarizing plate can be obtained through the same steps as the manufacturing method of the back-side polarizing plate described above.
  • the polarizing plate set according to the present invention can be preferably applied to a liquid crystal panel.
  • the liquid crystal panel includes a liquid crystal cell and a polarizing plate according to the present invention bonded to the surface thereof. Bonding of the back-side polarizing plate to the liquid crystal cell can be performed via the second pressure-sensitive adhesive layer.
  • the back side polarizing plate according to the present invention is usually used as a polarizing plate disposed on the backlight side of the liquid crystal cell.
  • the front side polarizing plate can be bonded to the liquid crystal cell via the third pressure-sensitive adhesive layer.
  • the front side polarizing plate according to the present invention is usually used as a polarizing plate disposed on the viewing side of the liquid crystal cell.
  • the pair of polarizing plates is the polarizing plate set,
  • the second protective film, the second polarizer, the third pressure-sensitive adhesive layer, the liquid crystal cell, the second pressure-sensitive adhesive layer, the first protective film, the first polarizer, the first pressure-sensitive adhesive layer, and the reflection A liquid crystal panel in which mold-type polarizing plates are laminated in this order is provided.
  • the driving method of the liquid crystal cell may be any conventionally known method, but is preferably the IPS mode.
  • the liquid crystal panel using the polarizing plate according to the present invention is excellent in wet heat durability.
  • an organic electroluminescence display device can be obtained by bonding each polarizing plate to an organic electroluminescence display via the second pressure-sensitive adhesive layer and the third pressure-sensitive adhesive layer.
  • the film thickness was measured according to the following.
  • this polarizer may be referred to as a polarizer (23 ⁇ m).
  • this polarizer may be referred to as a polarizer (12 ⁇ m).
  • this polarizer was washed with pure water at 26 ° C. for 20 seconds and then dried at 65 ° C. to obtain a polarizer having a thickness of 7 ⁇ m in which iodine was adsorbed and oriented on the polyvinyl alcohol film.
  • this polarizer may be referred to as a polarizer (7 ⁇ m).
  • a commercially available pressure-sensitive adhesive sheet in which an acrylic pressure-sensitive adhesive layer having a thickness of 20 ⁇ m is provided on a release-treated surface of a polyethylene terephthalate film (release film) having a thickness of 38 ⁇ m that has been subjected to a release treatment. No urethane acrylate oligomer is blended.
  • Reflective polarizing plate-1 As the reflective polarizing plate-1, “Advanced Polarizer Film, Version 3” (thickness: 26 ⁇ m) manufactured by 3M was used.
  • HC-TAC a triacetyl cellulose film having a thickness of 32 ⁇ m and a hard coat surface (manufactured by Toppan TOMOEGAWA Optical Film, 25KCHC-TC), TAC: 25 ⁇ m thick triacetylcellulose film (TAC) [trade name “KC2UA” manufactured by Konica Minolta, Inc.]
  • COP-1 An unstretched 23 ⁇ m-thick norbornene resin film (trade name “ZEONOR” manufactured by Nippon Zeon Co., Ltd.)
  • COP-2 An unstretched 13 ⁇ m-thick norbornene resin film (trade name “ZEONOR” manufactured by Nippon Zeon Co., Ltd.)
  • Preparation of water-based adhesive 3 parts by weight of a carboxyl group-modified polyvinyl alcohol [“KL-318” manufactured by Kuraray Co., Ltd.] was dissolved in 100 parts by weight of water to prepare an aqueous polyvinyl alcohol solution.
  • aqueous polyvinyl alcohol solution 3 parts by weight of a carboxyl group-modified polyvinyl alcohol [“KL-318” manufactured by Kuraray Co., Ltd.] was dissolved in 100 parts by weight of water to prepare an aqueous polyvinyl alcohol solution.
  • water-soluble polyamide epoxy resin (“Smile Resin 650 (30) manufactured by Taoka Chemical Industry Co., Ltd., solid concentration: 30% by weight)” was added to 100 parts by weight of water. Mixing at a ratio, an aqueous adhesive was obtained.
  • FIG. 1 Preparation example of front side polarizing plate A
  • a water-based adhesive is applied to one side of a polarizer (12 ⁇ m), HC-TAC is bonded as a second protective film, and COP-1 is laminated on the opposite side using the above-mentioned adhesive, and 80 ° C.
  • the protective film and the polarizer were bonded together by drying for 5 minutes. After pasting, it was cured at 40 ° C. for 168 hours. Further, a third pressure-sensitive adhesive layer was bonded to the surface of COP-1 opposite to the polarizer.
  • This laminate was designated as a front side polarizing plate A.
  • the laminate has a rectangular shape with a long side length of 155.25 mm and a short side length of 95.90 mm.
  • a front side polarizing plate A was prepared in the same manner as the front side polarizing plate A, except that the polarizer of the front side polarizing plate A was changed to a polarizer (11 ⁇ m). This laminate was designated as a front side polarizing plate B.
  • a front side polarizing plate A was prepared in the same manner as the front side polarizing plate A except that the polarizer of the front side polarizing plate A was changed to a polarizer (23 ⁇ m). This laminate was designated as a front side polarizing plate C.
  • Example of production of back side polarizing plate (Example of production of back side polarizing plate A)
  • a water-based adhesive is applied to one side of a polarizer (11 ⁇ m), TAC is bonded as a protective film, and the other side is used to laminate COP-2 as a first protective film using the adhesive described above.
  • the protective film and the polarizer were bonded by drying at 5 ° C. for 5 minutes. After pasting, it was cured at 40 ° C. for 168 hours. Further, the second pressure-sensitive adhesive layer was bonded to the surface of COP-2 opposite to the polarizer. Furthermore, a reflective polarizing plate was bonded to the surface of the TAC opposite to the polarizer through a first adhesive.
  • This laminate was designated as a back side polarizing plate A.
  • the laminate has a rectangular shape with a long side length of 155.25 mm and a short side length of 95.90 mm.
  • the back side polarizing plate B was prepared in the same manner as the back side polarizing plate B except that the polarizer of the back side polarizing plate B was changed to a polarizer (7 ⁇ m). This laminate was designated as a front side polarizing plate C.
  • the back side polarizing plate A was prepared in the same manner as the back side polarizing plate A, except that the polarizer of the back side polarizing plate A was changed to a polarizer (12 ⁇ m). This laminate was designated as a front side polarizing plate D.
  • Table 1 shows the structures of the polarizing plates in Examples and Comparative Examples obtained as described above. Moreover, the physical property evaluation of each obtained polarizing plate was performed according to the following description. The results are shown in Table 1.
  • the curvature amount was measured with the following method. First, in the produced back side polarizing plate, the surface opposite to the first protective film in the second pressure-sensitive adhesive layer is pasted on glass having a thickness of 0.4 mm (manufactured by Corning, product number: EAGLE XG (registered trademark) ). Combined. Next, the surface opposite to the second polarizer in the third pressure-sensitive adhesive layer of the front side polarizing plate was bonded to the surface opposite to the second pressure-sensitive adhesive layer side in the glass.
  • the first polarizer in the back side polarizing plate is bonded so that the angle between the absorption axis of the second polarizer in the front side polarizing plate and the absorption axis of the first polarizer in the back side polarizing plate is 90 °.
  • a laminate was prepared so that the angle formed by the absorption axis of the polarizer and the long side of the back-side polarizing plate was 0 °.
  • the laminate having the configuration of the rear side polarizing plate / glass / front side polarizing plate was allowed to stand for 250 hours in an environment of 60 ° C. and humidity of 90%.
  • the laminate was taken out from the test tank and placed on a measuring table of a two-dimensional measuring device (manufactured by Nikon Corporation, NEXIV (registered trademark) MR-12072) so that the front polarizing plate was on the upper side.
  • the surface of the measuring table was focused, and the height from the reference focal point was measured by focusing on each of the 25 points on the glass sample surface.
  • the difference between the maximum value and the minimum value at the 25 measurement points was defined as the amount of warpage. Specifically, the point 40 shown in FIG.
  • the 25 points shown in FIG. 3 are points in a region 7 mm inside from the end of the polarizing plate, and the short side direction is provided at intervals of about 20 mm, and the long side direction is provided at intervals of about 35 mm.
  • symbol 50 shows a polarizing plate and 60 shows a glass plate.
  • Table 1 The results are shown in Table 1. In the examples, in all samples, the entire laminate was not lifted or peeled off, and no floating or peeling between layers was observed. ⁇ Judgment> The case where the amount of warpage of the glass sample that was allowed to stand in a humid heat environment was less than 0.6 mm was designated as “ ⁇ ”. The case where the amount of warpage of the glass sample placed in a humid heat environment was 0.6 mm or more was defined as “x”.
  • the polarizing plate set of this invention is a case where a polarizing plate is exposed to a moist heat environment on high temperature conditions, the curvature of a liquid crystal panel is suppressed. Furthermore, cohesive failure of the second pressure-sensitive adhesive layer and the third pressure-sensitive adhesive layer can be suppressed. Moreover, even when the polarizing plate of the present invention is exposed to a wet heat environment under high temperature conditions, the visibility of the polarizing plate is very good, and light leakage of the polarizing plate does not occur.
  • the polarizing plate set of the present invention has a small amount of warping when placed in a humid heat environment and a high temperature environment, peeling from the touch panel and falling off of the backlight unit can be reduced or avoided. In addition, display unevenness caused by warpage that may be caused by exposure to a high temperature environment and a moist heat environment is reduced.
  • a polarizing plate set in which, for example, warpage due to shrinkage of a polarizer and a reflective polarizing plate is suppressed. Furthermore, according to this invention, the polarizing plate set by which the cohesive failure of the adhesive layer bonded by the glass substrate of the liquid crystal cell was also suppressed is provided.

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  • Physics & Mathematics (AREA)
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  • Optics & Photonics (AREA)
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  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
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