WO2022191033A1 - Plaque de polarisation - Google Patents

Plaque de polarisation Download PDF

Info

Publication number
WO2022191033A1
WO2022191033A1 PCT/JP2022/009147 JP2022009147W WO2022191033A1 WO 2022191033 A1 WO2022191033 A1 WO 2022191033A1 JP 2022009147 W JP2022009147 W JP 2022009147W WO 2022191033 A1 WO2022191033 A1 WO 2022191033A1
Authority
WO
WIPO (PCT)
Prior art keywords
film
polarizing plate
polarizing
retardation
layer
Prior art date
Application number
PCT/JP2022/009147
Other languages
English (en)
Japanese (ja)
Inventor
謙一 福田
慎也 萩原
Original Assignee
住友化学株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Priority to KR1020237032982A priority Critical patent/KR20230154893A/ko
Priority to CN202280016561.3A priority patent/CN116888511A/zh
Publication of WO2022191033A1 publication Critical patent/WO2022191033A1/fr

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
    • C08L29/02—Homopolymers or copolymers of unsaturated alcohols
    • C08L29/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding 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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • 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
    • 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
    • H10K59/875—Arrangements for extracting light from the devices
    • H10K59/879—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
    • 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
    • H10K59/8793—Arrangements for polarized light emission

Definitions

  • the present invention relates to a polarizing plate, and further to a display device equipped with a polarizing plate.
  • Liquid crystal display devices are widely used not only for liquid crystal televisions, but also for mobile applications such as personal computers and mobile phones, and in-vehicle applications such as car navigation systems.
  • a liquid crystal display device has a liquid crystal panel member in which polarizing plates are adhered to both sides of a liquid crystal cell with an adhesive, and display is performed by controlling light from a backlight member with the liquid crystal panel member.
  • organic EL display devices have begun to be widely used in mobile applications such as televisions and mobile phones, and in-vehicle applications such as car navigation systems.
  • a retardation film is sometimes used in order to impart functions such as widening of the viewing angle or prevention of reflection of external light.
  • Polarizing plates are increasingly used in vehicles as optical elements that make up liquid crystal display devices and organic EL display devices. Compared to polarizing plates used in mobile applications such as televisions and mobile phones, polarizing plates used in in-vehicle display devices are often exposed to high-temperature environments and their properties change less at higher temperatures. (high temperature durability) is required.
  • In-vehicle display devices require a touch panel function when used in car navigation systems.
  • on-cell and in-cell display devices have been increasingly used as display devices having a touch panel function.
  • a scratch-preventing function is required in addition to high-temperature durability.
  • Patent Document 1 describes a polarizing plate including a retardation film made of a cyclic olefin resin film in order to expand the viewing angle.
  • Patent Document 2 describes that a film using a cyclic olefin resin may be used as a retardation film functioning as a ⁇ /4 plate constituting a polarizing plate.
  • the retardation film incorporated in the polarizing plate was further tested at room temperature and normal humidity. When stored in an environment for a long period of time, cracks were observed in some cases.
  • An object of the present invention is to provide a polarizing plate that has excellent scratch resistance and that suppresses the occurrence of cracks in the retardation film even when stored for a long period of time under normal temperature and humidity after a heat durability test.
  • the present invention provides the following polarizing plate.
  • the two or more protective films laminated on the first surface side at least one protective film has a moisture permeability at a temperature of 40°C and a relative humidity of 90% of 200 g/m 2 day or more.
  • the protective film laminated closest to the polarizing film has a moisture permeability of 200 g/m 2 at a temperature of 40°C and a relative humidity of 90%.
  • [5] The polarizing plate according to any one of [1] to [4], wherein the retardation film is a cyclic olefin resin film.
  • [6] The polarizing plate of any one of [1] to [5], wherein the retardation film has an in-plane retardation value of 80 nm or more at a wavelength of 550 nm.
  • a display device comprising the polarizing plate of [7] and a display element, The display device, wherein the polarizing plate is laminated on a display element via the pressure-sensitive adhesive layer.
  • a polarizing plate that has excellent scratch resistance and that suppresses the occurrence of cracks in the retardation film even after being stored for a long period of time under normal temperature and humidity conditions after a heat durability test.
  • FIG. 1 is a schematic cross-sectional view showing a polarizing plate according to one embodiment of the present invention.
  • FIG. 1 is a schematic cross-sectional view showing a polarizing plate according to this embodiment.
  • the polarizing plate 1 includes a polarizing film 11 in which a dichroic dye is adsorbed and oriented on a polyvinyl alcohol-based resin film (hereinafter sometimes referred to as a "PVA-based resin film”), and a hard coat layer ( hereinafter sometimes referred to as “HC layer”), and a retardation film 21 having a tensile elastic modulus of 3000 MPa or less at a temperature of 23°C.
  • PVA-based resin film polyvinyl alcohol-based resin film
  • HC layer hard coat layer
  • the polarizing plate 1 has two or more protective films 12 and 13 including HC layers laminated on the first surface 11a side of the polarizing film 11 .
  • the pencil hardness of the surface of the polarizing plate 1 on the side of the protective films 12 and 13 can be improved, so that the polarizing plate 1 can be provided with excellent scratch resistance.
  • the retardation film 21 cracked. It is possible to suppress the occurrence of (cracks). The reason for this is presumed as follows.
  • moisture (water vapor) in the atmosphere is easily taken into the polarizing plate.
  • Moisture taken into the polarizing plate causes dimensional change of the polarizing film including the PVA-based resin film.
  • the polarizing plate 1 since the polarizing plate 1 has two or more protective films 12 and 13 laminated on the first surface 11a side of the polarizing film 11, the amount of moisture taken into the polarizing plate 1 can be reduced. A dimensional change of the polarizing film 11 can be suppressed. Therefore, it is presumed that the force acting on the retardation film 21 provided on the second surface 11b side of the polarizing film 11 can be reduced, and the occurrence of cracks in the retardation film 21 can be suppressed. .
  • Each film constituting the polarizing plate 1 can be laminated via bonding layers 31 to 33 as shown in FIG.
  • the lamination layers 31 to 33 are layers using an adhesive or pressure-sensitive adhesive.
  • the bonding layer 31 for bonding the protective film 12 and the protective film 13 is preferably a layer using an adhesive.
  • Both the bonding layer 32 for bonding the protective film 13 and the polarizing film 11 and the bonding layer 33 for bonding the polarizing film 11 and the retardation film 21 are layers using an adhesive. is preferably
  • the polarizing plate 1 further includes an antistatic layer, another retardation layer different from the retardation film 21, another protective layer different from the protective films 12 and 13 for protecting the surface of the polarizing film 11, etc. may have a functional layer of
  • the polarizing plate 1 can be used as an optical element that constitutes a display device. Therefore, the polarizing plate 1 may have an adhesive layer 35 (FIG. 1) for bonding the polarizing plate 1 to a display element of a display device or the like. The polarizing plate 1 may further have a release film that covers and protects the pressure-sensitive adhesive layer 35 and that can be peeled off the pressure-sensitive adhesive layer 35 .
  • the display device can include a polarizing plate 1 and a display element such as a liquid crystal cell or an organic electroluminescence (EL) element.
  • the polarizing plate 1 can be arranged so that the second surface 11b side of the polarizing film 11 faces the display element side.
  • the polarizing plate 1 may be laminated on the display element via the adhesive layer 35 shown in FIG. Just do it. Examples of display devices include liquid crystal display devices and organic EL devices.
  • the films and layers constituting the polarizing plate 1 will be described in detail below.
  • the polarizing film 11 is an absorptive polarizing film having a property of absorbing linearly polarized light having a plane of vibration parallel to its absorption axis and transmitting linearly polarized light having a plane of vibration perpendicular to the absorption axis (parallel to the transmission axis).
  • a film in which a dichroic dye is adsorbed and oriented on a uniaxially stretched PVA-based resin film can be preferably used.
  • the thickness of the polarizing film 11 is usually 50 ⁇ m or less, preferably 5 ⁇ m or more and 30 ⁇ m or less, more preferably 5 ⁇ m or more and 25 ⁇ m or less, and still more preferably 5 ⁇ m or more and 20 ⁇ m or less.
  • the polarizing film 11 can be prevented from being broken, cracked, or the like during production, and can maintain good optical properties at the same time.
  • the thickness of the polarizing film By setting the thickness of the polarizing film to 20 ⁇ m or less, it is possible to further suppress deterioration in visibility when placed in a high-temperature environment.
  • the polarizing film 11 is formed by, for example, a process of stretching a PVA-based resin film; a process of dyeing the PVA-based resin film with a dichroic dye to adsorb the dichroic dye; and a PVA-based resin to which the dichroic dye is adsorbed. It can be produced by a method comprising a step of treating the film with a cross-linking solution such as an aqueous boric acid solution; and a step of washing with water after the step of treating with the cross-linking solution.
  • a cross-linking solution such as an aqueous boric acid solution
  • PVA-based resin film it is possible to use a film made of polyvinyl alcohol-based resin (hereinafter sometimes referred to as "PVA-based resin").
  • PVA-based resins include saponified polyvinyl acetate-based resins.
  • polyvinyl acetate-based resins include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate with other monomers that can be copolymerized.
  • Other monomers copolymerizable with vinyl acetate include, for example, unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and (meth)acrylamides having an ammonium group.
  • (meth)acryl means at least one selected from acryl and methacryl. The same applies to "(meth)acryloyl", "(meth)acrylate” and the like.
  • the degree of saponification of the PVA-based resin is usually 85 mol% or more and 100 mol% or less, preferably 98 mol% or more.
  • the PVA-based resin may be modified, for example, aldehyde-modified polyvinyl formal or polyvinyl acetal may be used.
  • the average degree of polymerization of the PVA-based resin is usually 1000 or more and 10000 or less, preferably 1500 or more and 5000 or less.
  • the average degree of polymerization of the PVA-based resin can be obtained according to JIS K 6726.
  • the method of forming a PVA-based resin film is not particularly limited, and a known method is adopted.
  • the thickness of the PVA-based resin film used for the raw film when producing the polarizing film is preferably 40 ⁇ m or more and 75 ⁇ m or less, and more preferably 45 ⁇ m or less.
  • the stretching of the PVA-based resin film is preferably uniaxial stretching.
  • Uniaxial stretching can be performed before, at the same time as, or after dyeing the dichroic dye. When uniaxial stretching is performed after dyeing, this uniaxial stretching may be performed before or during the cross-linking treatment. Moreover, you may uniaxially stretch in these several steps.
  • the film In the uniaxial stretching, the film may be uniaxially stretched between rolls having different circumferential speeds, or may be uniaxially stretched using hot rolls.
  • the uniaxial stretching may be dry stretching in which the film is stretched in the air, or wet stretching in which the PVA-based resin film is stretched in a swollen state using a solvent or water. The draw ratio is usually 3 to 8 times.
  • a method for dyeing a PVA-based resin film with a dichroic dye for example, a method of immersing the PVA-based resin film in an aqueous solution containing a dichroic dye is adopted. Iodine and dichroic organic dyes are used as dichroic dyes.
  • the PVA-based resin film is preferably immersed in water before being dyed.
  • the boric acid-containing aqueous solution preferably contains potassium iodide.
  • Protective films 12 and 13 have a base film and an HC layer. It is preferable that the protective films 12 and 13 have an HC layer formed so as to be in direct contact with the base film.
  • the HC layer is preferably provided on one side of the base film, but may be provided on both sides.
  • the protective films 12 and 13 laminated on the first surface 11a side of the polarizing film 11 (hereinafter, two or more protective films laminated on the first surface 11a side may be collectively referred to as a "protective film group").
  • a protective film group is preferably 5 or less, more preferably 3 or less, and most preferably 2.
  • the protective film group includes 6 or more protective films, it becomes difficult to adjust the curl (warp) of the polarizing plate 1 .
  • the protective films 12 and 13 constituting the protective film group are preferably laminated via a bonding layer 31, and both surfaces of the bonding layer 31 constitute the protective film group. More preferably, it is in direct contact with protective films 12 and 13 .
  • the base film is arranged on the polarizing film 11 side, and the HC layer is on the surface side of the polarizing plate 1 (the side opposite to the polarizing film 11 side).
  • the thickness of the protective film is not particularly limited, it is usually 1 ⁇ m or more and 100 ⁇ m or less, preferably 5 ⁇ m or more and 60 ⁇ m or less, more preferably 10 ⁇ m or more and 55 ⁇ m or less, and 15 ⁇ m or more and 50 ⁇ m or less from the viewpoint of strength and handleability. is more preferable.
  • One or both of the material and thickness of the base film and the HC layer may be the same for the protective films 12 and 13 constituting the protective film group. may be different from each other.
  • At least one protective film in the protective film group preferably has a moisture permeability of 200 g/m 2 ⁇ day or more at a temperature of 40°C and a relative humidity of 90%, more preferably 300 g/m 2 ⁇ day or more.
  • the upper limit is usually 5000 g/m 2 ⁇ day or less, preferably 2000 g/m 2 ⁇ day or less, more preferably 1000 g/m 2 ⁇ day or less.
  • at least one protective film in the group of protective films should have a moisture permeability within the above range. By setting the moisture permeability of the protective film within the above range, it is possible to prevent the polarizing film 11 from becoming polyene and being colored in the heating endurance test described later.
  • the protective film 12 laminated closest to the polarizing film in the group of protective films has a moisture permeability within the above range.
  • a bonding agent adhesive or adhesive
  • the bonding layer is dried by drying. 32 and then a protective film 13 may be laminated.
  • the moisture permeability of the protective film 12, which is laminated closest to the polarizing film 11 among the protective films, to the above range the moisture contained in the bonding agent can be easily removed by the drying process.
  • the moisture permeability of the other protective films 13 other than the protective film 12 included in the protective film group is not particularly limited.
  • the moisture permeability of the other protective film 13 may be lower than the moisture permeability of the protective film 12 .
  • the moisture permeability of the other protective film 13 at a temperature of 40° C. and a relative humidity of 90% is not particularly limited, but is preferably 1000 g/m 2 ⁇ day or less, more preferably 500 g/m 2 ⁇ day or less. .
  • the moisture permeability of the protective film 13 is preferably more than 20 g/m 2 ⁇ day, more preferably 30 g/m 2 ⁇ day or more.
  • the upper limit value of the moisture permeability of the other protective film 13 By setting the upper limit value of the moisture permeability of the other protective film 13 within the above range, it is possible to suppress the rate at which moisture is taken into the polarizing plate 1 after the heat durability test. As a result, it becomes easier to secure time for stress relaxation of the polarizing film 11 , so it is thought that the occurrence of cracks in the retardation film 21 can be suppressed.
  • the lower limit value of the moisture permeability of the other protective film 13 within the above range, it is possible to suppress the polarizing film 11 from polyene-forming and coloring in the heat durability test.
  • the moisture permeability of the protective films 12 and 13 can be measured by the method described in Examples below.
  • the moisture permeability of the protective film 12 is 200 g/m 2 ⁇ day or more, and the moisture permeability of the other protective film 13 is 1000 g/m 2 ⁇ day or less. Even when the relationship is reversed, it is possible to prevent the polarizing film 11 from becoming polyene and coloring due to the heating endurance test.
  • the base film that constitutes the protective films 12 and 13 is not particularly limited, but is preferably made of a resin material that is excellent in transparency, mechanical strength, thermal stability, moisture shielding properties, and the like.
  • resin materials include (meth)methyl acrylate-based resins, polyolefin-based resins, cyclic olefin-based resins, polyvinyl chloride-based resins, cellulose-based resins, styrene-based resins, acrylonitrile-butadiene-styrene-based resins, Acrylonitrile/Styrene Resin, Polyvinyl Acetate Resin, Polyvinylidene Chloride Resin, Polyamide Resin, Polyacetal Resin, Polycarbonate Resin, Modified Polyphenylene Ether Resin, Polybutylene Tephthalate Resin, Polyethylene Tephthalate Resin, Polysulfone one or more of polyethersulfone-based resins, polyarylate-based resins, polyamideimide-based
  • the base film of at least one protective film in the group of protective films is preferably a cellulose resin film formed using a cellulose resin as a resin material. It is more preferable that the base films of all the protective films constituting the protective film group are cellulose resin films.
  • the cellulosic resin can be an organic acid ester or mixed organic acid ester of cellulose in which some or all of the hydrogen atoms in the hydroxyl groups of cellulose are substituted with acetyl groups, propionyl groups and/or butyryl groups.
  • examples thereof include cellulose acetate, propionate, butyrate, and mixed esters thereof.
  • triacetyl cellulose, diacetyl cellulose, cellulose acetate propionate, cellulose acetate butyrate and the like are preferable.
  • additives may be added to the resin material constituting the base film as long as the transparency is not impaired. Additives such as antioxidants, ultraviolet absorbers, antistatic agents, lubricants, nucleating agents, antifogging agents, antiblocking agents, retardation reducing agents, stabilizers, processing aids, plasticizers, impact resistance aids , matting agents, antibacterial agents, antifungal agents, and the like. One or more of these additives may be used, and multiple types may be used in combination.
  • the thickness of the base film is not particularly limited, but may be, for example, 1 ⁇ m or more, 3 ⁇ m or more, 10 ⁇ m or more, 30 ⁇ m or more, and usually 90 ⁇ m or less. and may be 70 ⁇ m or less, 60 ⁇ m or less, or 50 ⁇ m or less.
  • the substrate film usually has a single-layer structure, but may have a multi-layer structure of two or more layers.
  • the HC layer that constitutes the protective films 12 and 13 is not particularly limited, it is preferably a cured product layer of an ultraviolet curable resin formed on the base film.
  • UV curable resins include (meth)acrylic resins, silicone resins, polyester resins, urethane resins, amide resins, and epoxy resins.
  • the HC layer may contain additives to improve surface hardness. Examples of additives include, but are not limited to, inorganic fine particles, organic fine particles, and mixtures thereof.
  • the thickness of the HC layer is preferably 10 ⁇ m or less, more preferably 8 ⁇ m or less, usually 0.1 ⁇ m or more, may be 1 ⁇ m or more, or may be 4 ⁇ m or more.
  • the curl (warp) of the protective films 12 and 13 increases, making it difficult to adjust the curl of the polarizing plate 1 .
  • the protective films 12 and 13 have a pencil hardness specified in JIS K 5600-5-4: 1999 "Paint general test method-Part 5: Mechanical properties of coating film-Section 4: Scratch hardness (pencil method)" According to the test (when the base film with the HC layer formed thereon is placed on a glass plate and the HC layer side is measured), it is preferably H or more, more preferably 2H or more, and 3H or more. It may be 4H or more.
  • the HC layer is, for example, a composition for forming an HC layer containing an ultraviolet curable resin and, if necessary, additives (hereinafter sometimes referred to as "composition for forming an HC layer") on a base film. ) and cured by UV irradiation.
  • composition for forming an HC layer a composition for forming an HC layer containing an ultraviolet curable resin and, if necessary, additives
  • the retardation film 21 is a film having retardation, and is usually a stretched film obtained by stretching a resin film.
  • the retardation film 21 preferably has a single layer structure.
  • the tensile elastic modulus of the retardation film 21 at a temperature of 23° C. is 3000 MPa or less, and may be 2800 MPa or less, usually 1000 MPa or more, and may be 2000 MPa or more.
  • the tensile modulus can be measured by the method described in Examples below.
  • Examples of the retardation film 21 having the above tensile modulus include an olefin-based resin film formed using an olefin-based resin.
  • Olefin-based resins include linear aliphatic olefins such as ethylene and propylene, or alicyclic olefins such as norbornene and its substituted products (hereinafter collectively referred to as "norbornene-based monomers").
  • Examples include resins mainly containing derived structural units. Mainly containing structural units means that the proportion of the structural units contained in the resin is 50% or more based on the amount of substance.
  • the olefinic resin may be a copolymer using two or more monomers.
  • the retardation film 21 is preferably a cyclic olefin-based resin film formed using a cyclic olefin-based resin, which is a resin mainly containing structural units derived from an alicyclic olefin.
  • a cyclic olefin-based resin which is a resin mainly containing structural units derived from an alicyclic olefin.
  • Typical examples of alicyclic olefins constituting cyclic olefin resins include norbornene-based monomers.
  • Norbornene is a compound in which one carbon-carbon bond of norbornane is a double bond, and according to the IUPAC nomenclature, it is named bicyclo[2,2,1]hept-2-ene. be.
  • substituted norbornene examples include 3-substituted, 4-substituted, and 4,5-disubstituted, with the double bond position of norbornene being 1,2-position, and further Also included are dicyclopentadiene and dimethanooctahydronaphthalene.
  • the cyclic olefin resin may or may not have a norbornane ring in its constituent units.
  • norbornene-based monomers that form cyclic olefin-based resins that do not have a norbornane ring in their constituent units include, for example, those that become 5-membered rings by ring opening, typically norbornene, dicyclopentadiene, 1- or 4- Examples include methylnorbornene, 4-phenylnorbornene, and the like.
  • the cyclic olefin resin is a copolymer
  • the arrangement state of its molecules is not particularly limited, and may be a random copolymer, a block copolymer, or a graft copolymer. It may be a polymer.
  • cyclic olefin resins include ring-opening polymers of norbornene-based monomers, ring-opening copolymers of norbornene-based monomers and other monomers, maleic acid addition, cyclopentadiene addition, and the like. modified polymers, and hydrogenated polymers or copolymers thereof; addition polymers of norbornene-based monomers, addition copolymers of norbornene-based monomers and other monomers, and the like.
  • Other monomers in the case of copolymerization include ⁇ -olefins, cycloalkenes, non-conjugated dienes, and the like.
  • the cyclic olefin-based resin may be a copolymer using one or more of norbornene-based monomers and other alicyclic olefins.
  • the cyclic olefin-based resin a ring-opening polymer or a resin obtained by hydrogenating a ring-opening copolymer using a norbornene-based monomer is preferable.
  • a film made of a mixed resin containing two or more kinds of olefinic resins, or a film made of a mixed resin of an olefinic resin and another thermoplastic resin can be used.
  • mixed resins containing two or more kinds of olefinic resins include mixtures of cyclic olefinic resins and linear aliphatic olefinic resins as described above.
  • the other thermoplastic resin is appropriately selected depending on the purpose.
  • thermoplastic resins include polyvinyl chloride resins, cellulose resins, polystyrene resins, acrylonitrile/butadiene/styrene copolymer resins, acrylonitrile/styrene copolymer resins, (meth)acrylic resins, and polyacetic acid.
  • Vinyl resin polyvinylidene chloride resin, polyamide resin, polyacetal resin, polycarbonate resin, modified polyphenylene ether resin, polybutylene terephthalate resin, polyethylene terephthalate resin, polyphenylene sulfide resin, polysulfone resin, polyether
  • examples include sulfone-based resins, polyetheretherketone-based resins, polyarylate-based resins, liquid-crystalline resins, polyamide-imide-based resins, polyimide-based resins, and polytetrafluoroethylene-based resins.
  • These thermoplastic resins may be used alone or in combination of two or more.
  • the thermoplastic resin can be used after being subjected to any appropriate polymer modification. Examples of polymer modification include copolymerization, cross-linking, molecular terminal modification, stereoregularity impartation, and the like.
  • the content of the other thermoplastic resin is usually about 50% by weight or less, preferably about 40% by weight or less, based on the total resin.
  • the retardation film has a small absolute value of the photoelastic coefficient, exhibits good wavelength dispersion characteristics, and is excellent in durability, mechanical strength, and transparency. 21 can be obtained.
  • the retardation film 21 may contain other components such as residual solvents, stabilizers, plasticizers, anti-aging agents, anti-static agents, and ultraviolet absorbers as necessary.
  • a leveling agent may also be included to reduce surface roughness.
  • the retardation film 21 preferably has an in-plane retardation value, and the in-plane retardation value at a wavelength of 550 nm is preferably 80 nm or more, may be 90 nm or more, or may be 100 nm or more, Moreover, it may be 300 nm or less, or may be 200 nm or less.
  • the retardation film 21 is preferably a stretched film.
  • the polarizing plate 1 has a structure in which two or more protective films 12 and 13 are laminated on the first surface 11 a of the polarizing film 11 .
  • the polarizing plate 1 including the retardation film 21 having a high in-plane retardation value as described above is held for a long time under normal temperature and humidity environment after the heat durability test, the dimensions of the polarizing film 11 Since the change can be suppressed and the force acting on the retardation film 21 can be reduced accordingly, the generation of cracks in the retardation film 21 can be suppressed.
  • the in-plane retardation value of the retardation film 21 can be measured by the method described in Examples below.
  • the in-plane retardation value Re( ⁇ ) of the retardation film 21 at the wavelength ⁇ [nm] refers to the in-plane retardation value of the retardation film 21 at a temperature of 23° C., and is obtained by the following formula (i).
  • Re( ⁇ ) (nx ⁇ ny) ⁇ d(i) [in the formula (i), nx is the refractive index in the direction in which the in-plane refractive index is maximum (that is, the slow axis direction), ny is the refractive index in the direction perpendicular to the slow axis in the plane, d is the thickness [nm] of the retardation film 21 . ]
  • the retardation film 21 may have a retardation value of 0 (zero) in the thickness direction, or may have a retardation value in the thickness direction.
  • the thickness direction retardation value of the retardation film 21 at a wavelength of 550 nm may be, for example, 10 nm or more, 20 nm or more, 40 nm or more, or 100 nm or less. , 80 nm or less, or 60 nm or less.
  • the retardation value in the thickness direction of the retardation film 21 can be measured by the method described in Examples below.
  • the retardation value Rth( ⁇ ) in the thickness direction of the retardation film 21 at the wavelength ⁇ [nm] refers to the retardation value in the thickness direction of the retardation film 21 at a temperature of 23° C., and is obtained by the following formula (ii).
  • Rth( ⁇ ) [ ⁇ (nx+ny)/2 ⁇ -nz] ⁇ d (ii)
  • nx is the refractive index in the direction in which the in-plane refractive index is maximum (that is, the slow axis direction)
  • ny is the refractive index in the direction perpendicular to the slow axis in the plane
  • nz is the refractive index in the thickness direction
  • d is the thickness [nm] of the retardation film 21 .
  • the thickness of the retardation film 21 is not particularly limited, it is preferably 15 ⁇ m or more and 80 ⁇ m or less, more preferably 18 ⁇ m or more and 45 ⁇ m or less, and most preferably 20 ⁇ m or more and 30 ⁇ m or less.
  • the thickness of the retardation film is less than 15 ⁇ m, it tends to be difficult to handle the film and to exhibit a predetermined retardation value.
  • the thickness of the retardation film exceeds 80 ⁇ m, the processability tends to be poor, the transparency tends to decrease, and the weight of the obtained polarizing plate 1 tends to increase.
  • the retardation film 21 can be obtained by using a resin film formed using the resin described above and stretching it.
  • the resin film can be obtained, for example, by forming a film from a solution containing the above-described olefinic resin by a casting method, a melt extrusion method, or the like.
  • the film forming method is not particularly limited. Examples include a method of producing a film by a casting method, and a method of producing a film by melt-extrusion by melt-mixing resin components in a predetermined ratio.
  • Examples of the stretching treatment of the resin film include known vertical uniaxial stretching, tenter horizontal uniaxial stretching, simultaneous biaxial stretching, and sequential biaxial stretching.
  • various temperatures such as preheating temperature, stretching temperature, heat setting temperature, cooling temperature, etc. during stretching, and The pattern may be appropriately selected.
  • the retardation film 21 is the cyclic olefin-based resin film described above, for example, a film-like material that has been subjected to stretching treatment in advance using the cyclic olefin-based resin described above, and a shrinkable film having a predetermined shrinkage rate is obtained. can be obtained by bonding and heat-shrinking. Thereby, a retardation film 21 having high uniformity and a large retardation value can be obtained.
  • the polarizing plate 1 includes an antistatic layer, another retardation layer different from the retardation film 21, and another protective layer different from the protective films 12 and 13 for covering and protecting the surface of the polarizing film 11. It may have one or more functional layers.
  • the antistatic layer is a layer for suppressing the polarizing plate 1 from being charged.
  • the antistatic layer usually contains an antistatic agent such as an ionic compound, and can be, for example, a layer containing an antistatic agent and a resin.
  • the antistatic layer is, for example, in the polarizing plate 1, between the polarizing film 11 and the retardation film 21, or between the polarizing film 11 and the protective film 12, the opposite side of the retardation film 21 from the polarizing film 11, etc. can be set to
  • the antistatic layer is preferably laminated on these films via a lamination layer.
  • Another retardation layer is a layer having an in-plane retardation value or a retardation value in the thickness direction.
  • the other retardation layer may be, for example, a retardation layer having a retardation value in the thickness direction at a wavelength of 550 nm, such as a positive C plate.
  • a positive C plate is used, for example, when the polarizing plate 1 is used in an IPS mode liquid crystal display device or the like.
  • Another retardation layer can be provided, for example, between the polarizing film 11 and the retardation film 21 or on the side of the retardation film 21 opposite to the polarizing film 11 side.
  • the other retardation layer may be a stretched film obtained by stretching a resin film, or may be a cured product layer of a polymerizable liquid crystal compound.
  • Another retardation layer can be laminated on the polarizing film 11 and the retardation film 21 via a bonding layer.
  • the other retardation layer is a cured product layer, by polymerizing and curing the polymerizable liquid crystal compound applied to the polarizing film 11 or the retardation film 21, it can be provided so as to be in direct contact with these films.
  • Another protective layer is a layer for covering and protecting the first surface 11 a or the second surface 11 b of the polarizing film 11 .
  • Another protective layer is provided on the second surface 11b side of the polarizing film 11, and is preferably provided between the polarizing film 11 and the retardation film 21 via a bonding layer.
  • the bonding layer provided between the polarizing film 11 and the other protective layer is provided so as to be in contact with the polarizing film 11 and the other protective layer, respectively, and between the other protective layer and the retardation film 21
  • the lamination layer provided in 1 is provided so as to be in contact with the other protective layer and the retardation film 21 respectively.
  • Another protective layer includes a film formed using the resin material described in the base film forming the protective films 12 and 13 .
  • the other protective layer preferably has no retardation, and examples thereof include a cellulose resin film having no retardation and a cyclic olefin resin film having no retardation.
  • the adhesive is an adhesive other than a pressure-sensitive adhesive (adhesive), and includes, for example, a water-based adhesive, an active energy ray-curable adhesive or a thermosetting adhesive, preferably a water-based adhesive, It is an active energy ray-curable adhesive.
  • the thickness of the lamination layer formed using an adhesive may be, for example, 0.01 ⁇ m or more, 0.1 ⁇ m or more, 0.5 ⁇ m or more, or 1 ⁇ m or more. For example, it may be 20 ⁇ m or less, 15 ⁇ m or less, 10 ⁇ m or less, or 5 ⁇ m or less.
  • water-based adhesives include adhesives made from aqueous solutions of polyvinyl alcohol-based resins, water-based two-liquid urethane-based emulsion adhesives, and the like. Among them, a water-based adhesive composed of an aqueous polyvinyl alcohol resin solution is preferably used.
  • Polyvinyl alcohol-based resins include vinyl alcohol homopolymers obtained by saponifying polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate with other monomers copolymerizable therewith.
  • a polyvinyl alcohol-based copolymer obtained by saponifying a polymer, or a modified polyvinyl alcohol-based polymer obtained by partially modifying the hydroxyl groups thereof can be used.
  • the water-based adhesive can contain cross-linking agents such as aldehyde compounds (glyoxal, etc.), epoxy compounds, melamine compounds, methylol compounds, isocyanate compounds, amine compounds, polyvalent metal salts, and the like.
  • a drying process to remove the water contained in the water-based adhesive after lamination with the film to be laminated.
  • a curing step of curing at a temperature of, for example, 20 to 45°C may be provided.
  • the active energy ray-curable adhesive is an adhesive containing a curable compound that is cured by irradiation with an active energy ray such as ultraviolet rays, visible light, electron beams, and X-rays, and is preferably an ultraviolet curable adhesive.
  • the curable compound can be a cationically polymerizable curable compound or a radically polymerizable curable compound.
  • Examples of cationic polymerizable curable compounds include epoxy compounds (compounds having one or more epoxy groups in the molecule) and oxetane compounds (one or two or more oxetane rings in the molecule). compound), or a combination thereof.
  • radically polymerizable curable compounds examples include (meth)acrylic compounds (compounds having one or more (meth)acryloyloxy groups in the molecule) and radically polymerizable double bonds. Other vinyl-based compounds or combinations thereof can be included.
  • a cationic polymerizable curable compound and a radically polymerizable curable compound may be used in combination.
  • the active energy ray-curable adhesive usually further contains a cationic polymerization initiator and/or a radical polymerization initiator for initiating the curing reaction of the curable compound.
  • a pressure-sensitive adhesive exhibits adhesiveness when it is attached to an adherend, and is called a pressure-sensitive adhesive.
  • the adhesive can be composed of an adhesive composition containing a (meth)acrylic, rubber, urethane, ester, silicone, or polyvinyl ether resin as a main component. Among them, a pressure-sensitive adhesive composition using a (meth)acrylic resin as a base polymer, which is excellent in transparency, weather resistance, heat resistance, etc., is preferable.
  • the adhesive may be active energy ray-curable or thermosetting.
  • the thickness of the lamination layer formed using the adhesive is usually 3 ⁇ m or more and 30 ⁇ m or less, preferably 3 ⁇ m or more and 25 ⁇ m or less.
  • the (meth)acrylic resin (base polymer) contained in the adhesive composition includes, for example, butyl (meth)acrylate, ethyl (meth)acrylate, isooctyl (meth)acrylate, 2-(meth)acrylate, Polymers or copolymers containing one or more of (meth)acrylic acid esters such as ethylhexyl as monomers are preferably used.
  • the base polymer is 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 ( Monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group, etc., such as meth)acrylates, can be mentioned.
  • the adhesive composition may contain only the above base polymer, but usually further contains a cross-linking agent.
  • the cross-linking agent is 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 include epoxy compounds and polyols that form ester bonds with carboxyl groups; and polyisocyanate compounds that form amide bonds with carboxyl groups. Among them, polyisocyanate compounds are preferred.
  • the polarizing plate 1 may have an adhesive layer 35 for bonding the polarizing plate 1 to a display element of a display device or the like.
  • the pressure-sensitive adhesive layer 35 is preferably provided on the side of the retardation film 21 of the polarizing plate 1 opposite to the polarizing film 11 side.
  • the adhesive layer 35 can be formed using an adhesive. Examples of the adhesive include the adhesive used for forming the bonding layer.
  • the thickness of the adhesive layer 35 is not particularly limited, it is usually 3 ⁇ m or more and 50 ⁇ m or less, preferably 5 ⁇ m or more and 40 ⁇ m or less, and may be 10 ⁇ m or more and 30 ⁇ m or less.
  • the polarizing plate 1 may have a release film that can be separated from the adhesive layer 35 .
  • the release film is used to cover and protect the surface of the adhesive layer 35 or to support the adhesive layer 35 .
  • Examples of the release film include a film obtained by subjecting the surface of the base resin film on the pressure-sensitive adhesive layer 35 side to release treatment such as silicone treatment.
  • Examples of the resin material that constitutes the base resin film include films formed using the resin materials described above for the base film.
  • the base resin film may have a one-layer structure or a multi-layer structure of two or more layers.
  • a method for manufacturing the polarizing plate 1 is not particularly limited, and a known method can be used.
  • the protective film 12 is laminated on the first surface 11a of the polarizing film 11 using a water-based adhesive
  • the retardation film 21 is laminated on the second surface 11b of the polarizing film 11 using a water-based adhesive.
  • a laminate of protective film 12/bonding layer 32/polarizing film 11/bonding layer 33/retardation film 21 is produced through a drying process for removing water in the agent. At this time, if the thickness difference between the protective film 12 and the retardation film 21 is 30 ⁇ m or less, curling of the laminate can be easily suppressed, and a flat laminate can be easily obtained.
  • the polarizing plate 1 can be obtained by laminating the protective film 13 on the protective film 12 side of the laminate with the bonding layer 31 interposed therebetween.
  • a step of laminating the protective films may be provided.
  • a laminate having a thickness difference of 30 ⁇ m or less between the protective film 12 and the retardation film 21 is used, curling occurring in the polarizing plate 1 can be easily suppressed, and a flat polarizing plate 1 can be obtained. easy to get
  • a surface activation treatment may be applied to the surface.
  • Surface activation treatments include dry treatments such as corona treatment, plasma treatment, discharge treatment (glow discharge treatment, etc.), flame treatment, ozone treatment, UV ozone treatment, ionizing active ray treatment (ultraviolet treatment, electron beam treatment, etc.). ; ultrasonic treatment using a solvent such as water or acetone, saponification treatment, and wet treatment such as anchor coating treatment. These surface activation treatments may be performed singly or in combination of two or more.
  • the moisture permeability of the protective film was measured in accordance with JIS K 7129:2008 Appendix B in an atmosphere at a temperature of 40°C and a relative humidity of 90%.
  • the storage elastic modulus G' of the measurement sample is measured using a dynamic viscoelasticity measuring device "DVA-220" manufactured by IT Keisoku Co., Ltd. under the conditions of a temperature of 23 ° C., a frequency of 1 Hz, and an initial strain of 1 N. Measure in
  • ⁇ Preparation of polarizing film> A 40 ⁇ m-thick PVA-based resin film made of a PVA-based resin having an average degree of polymerization of about 2400 and a degree of saponification of 99.9 mol % or more was prepared. This PVA-based resin film was uniaxially stretched about 5 times by a dry method, and further immersed in pure water at a temperature of 60° C. for 1 minute while maintaining the tension. After that, the PVA-based resin film was immersed in an aqueous solution of iodine/potassium iodide/water at a weight ratio of 0.05/5/100 at a temperature of 28° C. for 60 seconds.
  • the PVA-based resin film was immersed in an aqueous solution of potassium iodide/boric acid/water at a weight ratio of 8.5/8.5/100 at a temperature of 72° C. for 300 seconds. Subsequently, it was washed with pure water at a temperature of 26°C for 20 seconds and then dried at a temperature of 65°C. Thus, a polarizing film having a thickness of 15 ⁇ m was obtained in which iodine as a dichroic dye was adsorbed and oriented on the PVA-based resin film.
  • a composition for forming an HC layer was prepared by mixing the components shown below.
  • MEK 81.8 parts by mass PET30 is a mixture of pentaerythritol tetraacrylate and pentaerythritol triacrylate (manufactured by Nippon Kayaku Co., Ltd.).
  • Irgacure 907 is a photopolymerization initiator (manufactured by BASF).
  • MEK is methyl ethyl ketone.
  • a base film (cellulose acylate film TD40, manufactured by Fujifilm Corporation, width 1,340 mm, film thickness 40 ⁇ m) wound in a roll is unwound and transported at a speed of 30 m/min by a die coating method using a slot die. and dried at 60° C. for 150 seconds to form a coating layer. Then, under a nitrogen purge and an oxygen concentration of about 0.1%, an air-cooled metal halide lamp (manufactured by Eyegraphic Co., Ltd.) with an output of 160 W/cm was used to set an illuminance of 400 mW/cm 2 and an irradiation dose of 120 mJ/cm 2 .
  • An HC layer was formed by curing the coating layer by irradiating with ultraviolet rays.
  • the coating thickness of the coating layer was adjusted so that the thickness of the HC layer was 7 ⁇ m.
  • a protective film (1) having an HC layer on one side of the base film was obtained and wound up.
  • the moisture permeability of the protective film (1) was 250 g/m 2 ⁇ day.
  • the pencil hardness of the protective film (1) was 2H.
  • a protective film (2) was obtained in the same manner as the protective film (1), except that the thickness of the coating layer was adjusted so that the thickness of the HC layer was 5 ⁇ m.
  • the moisture permeability of the protective film (2) was 350 g/m 2 ⁇ day.
  • the pencil hardness of the protective film (2) was 3H.
  • a protective film (3) was obtained in the same manner as the protective film (1), except that the thickness of the coating layer was adjusted so that the thickness of the HC layer was 3 ⁇ m.
  • the moisture permeability of the protective film (3) was 500 g/m 2 ⁇ day.
  • the pencil hardness of the protective film (3) was 3H.
  • a retardation film and other retardation layers were prepared according to paragraphs [0106] to [0109] of WO2018/207798. Specifically, an unstretched cycloolefin polymer film (manufactured by JSR Corporation, trade name “Arton film”) was uniaxially stretched to obtain a retardation film having a thickness of 24 ⁇ m. When the tensile modulus of the obtained retardation film was measured at a temperature of 23° C., it was 2742 MPa. The retardation film had an in-plane retardation value Re(550) of 110 nm at a wavelength of 550 nm, and a thickness direction retardation value Rth(550) of 55 nm at a wavelength of 550 nm.
  • a retardation laminate was obtained by coating one side of the retardation film obtained above with a composition containing a rod-like liquid crystalline compound to form another retardation layer.
  • the other retardation layer had an in-plane retardation value Re(550) of 0 nm at a wavelength of 550 nm, and a thickness direction retardation value Rth(550) of ⁇ 100 nm at a wavelength of 550 nm.
  • PVA-based adhesive Preparation of polyvinyl alcohol-based adhesive (PVA-based adhesive)> 50 g of a modified PVA resin containing an acetoacetyl group (manufactured by Mitsubishi Chemical Corporation: Gohsenex Z-410) is dissolved in 950 g of pure water, heated at a temperature of 90 ° C. for 2 hours, cooled to room temperature, and polyvinyl alcohol solution. got Next, a polyvinyl alcohol solution, maleic acid, glyoxal, and pure water were blended so that each compound would have the following concentrations to prepare a PVA-based adhesive. Polyvinyl alcohol concentration 3.0% by weight Maleic acid concentration 0.01% by weight Glyoxal concentration 0.15% by weight
  • As the adhesive layer A a commercially available sheet-like acrylic adhesive with a thickness of 5 ⁇ m (storage elastic modulus at a temperature of 23° C.: 0.06 MPa) was prepared.
  • As the adhesive layer B a commercially available sheet-like acrylic adhesive with a thickness of 25 ⁇ m (storage elastic modulus at a temperature of 23° C. of 0.06 MPa) was prepared.
  • Example 1 The protective film (1) obtained above was immersed in a 1.5 mol/L NaOH aqueous solution (saponifying solution) kept at 55° C. for 2 minutes and then washed with water. The washed protective film (1) was immersed in a 0.05 mol/L sulfuric acid aqueous solution at 25° C. for 30 seconds and then passed under running water for 30 seconds to neutralize the protective film (1). After removing water from the protective film (1) with an air knife three times, it was dried by staying in a drying zone at a temperature of 70° C. for 15 seconds. As a result, a saponified protective film (1) was obtained in which the HC layer and the base film were subjected to saponification treatment (surface activation treatment).
  • saponification treatment surface activation treatment
  • a saponified protective film (1) (hereinafter sometimes referred to as “first protective film (1)”), a polarizing film, and a retardation laminate are combined with the PVA-based adhesive prepared above.
  • a laminate (1) was obtained by laminating through In the laminate (1), the absorption axis of the polarizing film and the slow axis of the retardation film were parallel.
  • the other retardation layer side of the retardation laminate faced the polarizing film, and the substrate film side of the first protective film (1) faced the polarizing film.
  • the adhesive strength between the retardation laminate and the polarizing film and the adhesive strength between the polarizing film and the first protective film (1) were practically sufficient.
  • the saponified protective film ( 1) (hereinafter sometimes referred to as "second protective film (1)") was laminated.
  • the base film side was used as the bonding surface with the pressure-sensitive adhesive layer (A).
  • the phase difference laminate side of the laminate (1) is subjected to corona treatment
  • the surface of the adhesive layer B is subjected to corona treatment
  • the corona-treated surface of the laminate (1) and the corona-treated surface of the adhesive layer (B) are treated. and laminated.
  • a polarizing plate (1) was obtained.
  • both the first protective film (1) and the second protective film (1) are arranged on the same surface side of the polarizing film, and the first protective film (1) is the polarizing film , and the second protective film (1) was positioned relatively far from the polarizing film.
  • Example 2 A saponified protective film (2) which is saponified in place of the first protective film (1) and the second protective film (1) and subjected to the same saponification treatment as the saponification treatment performed on the protective film (1).
  • a polarizing plate (2) was obtained in the same procedure as the polarizing plate (1) produced in Example 1, except that the polarizing plate (2) was used.
  • Example 3 A saponified protective film (3) which is saponified in place of the first protective film (1) and the second protective film (1) and is saponified in the same manner as the saponification of the protective film (1).
  • a polarizing plate (3) was obtained in the same procedure as the polarizing plate (1) produced in Example 1, except that the polarizing plate (3) was used.
  • Comparative Example 2 A laminate (1) produced in the same procedure as in Example 1 was obtained and used as a comparative polarizing plate (C2).
  • Comparative Example 3 instead of the first protective film (1), saponified base film (cellulose acylate film TD40, FUJIFILM Corporation A comparative polarizing plate (C3) was obtained in the same manner as the polarizing plate (1) produced in Example 1, except that the polarizing plate (1) produced in Example 1 was used, except that a polarizing plate (1,340 mm in width and 40 ⁇ m in thickness) was used.
  • saponified base film cellulose acylate film TD40, FUJIFILM Corporation
  • the prepared evaluation sample was held in a heating environment at a temperature of 105°C for 500 hours, and then cooled to a temperature of 23°C (normal temperature). Then, after holding for 30 days in a normal temperature and normal humidity environment with a temperature of 23° C. and a relative humidity of 55%, the retardation film of the polarizing plate or the comparative polarizing plate was observed to confirm the presence or absence of cracks. Furthermore, for the evaluation sample in which no cracks were observed at this point, the retardation film was observed 7 days later (37 days after the start of holding under the normal temperature and humidity environment) to determine whether cracks occurred. Checked for presence. Table 1 shows the results.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention concerne une plaque de polarisation qui présente une excellente résistance aux rayures et qui supprime la formation de fissures dans un film à différence de phase même lorsqu'il est stocké pendant une longue période dans un environnement à température normale et humidité normale après avoir été soumis à un test de durabilité thermique. La plaque de polarisation comprend : un film polarisant dans lequel un pigment dichroïque a été adsorbé et orienté sur un film de résine d'alcool polyvinylique ; un film protecteur dans lequel une couche de revêtement dur est disposée sur le dessus d'un film de base ; et le film à différence de phase qui a un module d'élasticité à la traction à une température de 23 °C de 3 000 MPa ou moins. Au moins deux films protecteurs sont disposés en couches sur un côté première surface du film polarisant. Le film à différence de phase est disposé en couches sur un côté de seconde surface du film polarisant, ledit côté de seconde surface étant le côté opposé à la première surface.
PCT/JP2022/009147 2021-03-11 2022-03-03 Plaque de polarisation WO2022191033A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020237032982A KR20230154893A (ko) 2021-03-11 2022-03-03 편광판
CN202280016561.3A CN116888511A (zh) 2021-03-11 2022-03-03 偏振板

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-038993 2021-03-11
JP2021038993A JP2022138876A (ja) 2021-03-11 2021-03-11 偏光板

Publications (1)

Publication Number Publication Date
WO2022191033A1 true WO2022191033A1 (fr) 2022-09-15

Family

ID=83227875

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/009147 WO2022191033A1 (fr) 2021-03-11 2022-03-03 Plaque de polarisation

Country Status (5)

Country Link
JP (1) JP2022138876A (fr)
KR (1) KR20230154893A (fr)
CN (1) CN116888511A (fr)
TW (1) TW202248681A (fr)
WO (1) WO2022191033A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005345958A (ja) * 2004-06-07 2005-12-15 Nitto Denko Corp 液晶パネル、偏光板および液晶表示装置
JP2015022200A (ja) * 2013-07-22 2015-02-02 富士フイルム株式会社 液晶表示装置
WO2017047408A1 (fr) * 2015-09-18 2017-03-23 住友化学株式会社 Plaque de polarisation composite et panneau à cristaux liquides utilisant celle-ci
JP2017156398A (ja) * 2016-02-29 2017-09-07 住友化学株式会社 偏光板のセットおよび液晶パネル

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100601920B1 (ko) 2004-01-09 2006-07-14 주식회사 엘지화학 음의 이축성 위상차 필름과 +ｃ-플레이트를 이용한 시야각보상필름을 포함하는 면상 스위칭 액정 표시장치
JP5755674B2 (ja) 2013-03-29 2015-07-29 日東電工株式会社 位相差フィルムの製造方法および円偏光板の製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005345958A (ja) * 2004-06-07 2005-12-15 Nitto Denko Corp 液晶パネル、偏光板および液晶表示装置
JP2015022200A (ja) * 2013-07-22 2015-02-02 富士フイルム株式会社 液晶表示装置
WO2017047408A1 (fr) * 2015-09-18 2017-03-23 住友化学株式会社 Plaque de polarisation composite et panneau à cristaux liquides utilisant celle-ci
JP2017156398A (ja) * 2016-02-29 2017-09-07 住友化学株式会社 偏光板のセットおよび液晶パネル

Also Published As

Publication number Publication date
TW202248681A (zh) 2022-12-16
KR20230154893A (ko) 2023-11-09
JP2022138876A (ja) 2022-09-26
CN116888511A (zh) 2023-10-13

Similar Documents

Publication Publication Date Title
JP5930636B2 (ja) 偏光板
CN105717572B (zh) 带有保护膜的偏振板及包含它的层叠体
CN108474891B (zh) 偏振板
KR102642673B1 (ko) 적층체
KR20190049493A (ko) 적층체
TW202000447A (zh) 偏光薄膜、附黏著劑層之偏光薄膜及影像顯示裝置
JP2020101815A (ja) 偏光板セット
KR20210009330A (ko) 편광판 및 표시 장치
KR20190008158A (ko) 편광판
KR20170132112A (ko) 편광판 및 화상 표시 장치
KR102593816B1 (ko) 광학 적층체 및 그 광학 적층체를 사용한 화상 표시 장치
JP6181804B2 (ja) 偏光板
TW202001308A (zh) 偏光薄膜、附黏著劑層之偏光薄膜及影像顯示裝置
CN109313306B (zh) 偏振板组件
WO2022191033A1 (fr) Plaque de polarisation
CN114488378A (zh) 偏振板及显示装置
WO2020213494A1 (fr) Stratifié optique et dispositif d'affichage d'image
WO2023013275A1 (fr) Plaque de polarisation équipée d'une couche de retard et dispositif d'affichage d'image l'utilisant
JP7345330B2 (ja) 光学積層体およびそれを用いた表示装置
JP7261336B1 (ja) 偏光板
WO2023228584A1 (fr) Procédé de production de plaque de polarisation
CN110780373A (zh) 圆偏振板及显示装置
JP2022072267A (ja) 偏光板及び液晶表示装置
JP2022146427A (ja) 光学積層体及び表示装置
JP2022145412A (ja) 光学積層体、その製造方法および画像表示装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22766991

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 202280016561.3

Country of ref document: CN

ENP Entry into the national phase

Ref document number: 20237032982

Country of ref document: KR

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 22766991

Country of ref document: EP

Kind code of ref document: A1