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WO2024075658A1 - Plaque de polarisation et dispositif d'affichage l'utilisant - Google Patents

Plaque de polarisation et dispositif d'affichage l'utilisant Download PDF

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Publication number
WO2024075658A1
WO2024075658A1 PCT/JP2023/035745 JP2023035745W WO2024075658A1 WO 2024075658 A1 WO2024075658 A1 WO 2024075658A1 JP 2023035745 W JP2023035745 W JP 2023035745W WO 2024075658 A1 WO2024075658 A1 WO 2024075658A1
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WO
WIPO (PCT)
Prior art keywords
protective film
meth
acrylate
hard coat
layer
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2023/035745
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English (en)
Japanese (ja)
Inventor
伸 川田
和真 荒堀
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toppan Tomoegawa Optical Films Co Ltd
Original Assignee
Toppan Tomoegawa Optical Films Co Ltd
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 Toppan Tomoegawa Optical Films Co Ltd filed Critical Toppan Tomoegawa Optical Films Co Ltd
Priority to KR1020257007239A priority Critical patent/KR20250048738A/ko
Priority to CN202380063073.2A priority patent/CN119790332A/zh
Publication of WO2024075658A1 publication Critical patent/WO2024075658A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/023—Mountings, adjusting means, or light-tight connections, for optical elements for lenses permitting adjustment
    • 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 and a display device using the same.
  • Polyvinyl alcohol (PVA) is mainly used for polarizing plates used in display devices. Since PVA has extremely poor water resistance, protective films are attached to both sides of the film. Conventionally, hard coat films with moisture permeability of about 300 to 1000 g/m 2 /day, which are made by laminating a hard coat layer on a triacetyl cellulose (TAC) film, have been used as protective films for polarizing plates. However, under harsh conditions of high temperature and humidity, the PVA cannot completely prevent water absorption, which causes degradation.
  • TAC triacetyl cellulose
  • the present invention therefore aims to provide a polarizing plate that is durable in high-temperature, high-humidity environments and a display device that uses the same.
  • the polarizing plate of the present invention is a polarizing plate having a protective film A bonded to one surface of a polarizer and a protective film B bonded to the other surface, wherein the protective film A is a hard coat film having a hard coat layer formed on one surface of a transparent substrate, and has a substrate layer made of a resin component of the transparent substrate, an outermost layer made of a hard coat component, and a compatible layer formed between the substrate layer and the outermost layer and in which the resin component of the transparent substrate and the hard coat component are mixed, wherein the moisture permeability TA of the protective film A and the moisture permeability TB of the protective film B at 40°C and 90% RH simultaneously satisfy the following conditions (1) and (2), and the thickness a of the outermost layer and the thickness b of the compatible layer satisfy the following condition (3). 240 g/m 2 /day>TA>70 g/m 2 /day ... (1) 70 g/m 2 /day ⁇ TB (2) 0.60 ⁇ a/b ⁇ 0.85 (3)
  • the display device according to the present invention is equipped with the above polarizing plate.
  • the present invention provides a polarizing plate that is durable in high-temperature, high-humidity environments, and a display device using the same.
  • FIG. 1 is a cross-sectional view showing a schematic configuration of a polarizing plate according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view showing a schematic configuration of the protective film A shown in FIG.
  • FIG. 1 is a cross-sectional view showing the schematic configuration of a polarizing plate according to an embodiment.
  • the polarizing plate 10 comprises a polarizer 1, a protective film A attached to one side of the polarizer 1, and a protective film B attached to the other side of the polarizer 1.
  • the polarizer 1 is formed by adsorbing iodine or a dye onto a polyvinyl alcohol (PVA) film and orienting it.
  • PVA polyvinyl alcohol
  • the PVA that constitutes the polarizer 1 has poor strength and water resistance, so protective films A and B are attached to both sides of the polarizer 1.
  • Protective film A is a hard coat film in which a hard coat layer is formed on one side of a transparent substrate.
  • the hard coat layer is a functional layer that covers the flexible transparent substrate and imparts hardness and water vapor barrier properties to protective film A.
  • a triacetyl cellulose (TAC) film, which has excellent transparency, can be suitably used as the transparent substrate.
  • FIG. 2 is a cross-sectional view showing the schematic configuration of protective film A shown in FIG. 1.
  • Protective film A can be formed by applying a hard coat layer-forming composition containing an active energy ray-curable compound, a hydrophobic material, a photopolymerization initiator, and a solvent to one side of a transparent substrate, drying the composition, and curing the coating by irradiating it with ultraviolet light.
  • the hard coat layer forming composition When the hard coat layer forming composition is applied to the transparent substrate, a part of the transparent substrate swells or dissolves due to the solvent contained in the hard coat layer forming composition, and a layer is formed in which the components of the hard coat layer forming composition (hard coat components) and the resin components constituting the transparent substrate are mixed.
  • the coating film After drying the coating film of the hard coat layer forming composition, the coating film is cured by ultraviolet irradiation, as shown in FIG. 2, a substrate layer 2 mainly made of the resin components of the transparent substrate, an outermost layer 3 which is a cured layer mainly made of the hard coat components, and a compatible layer 4 formed between the substrate layer 2 and the outermost layer 3 and in which the resin components of the transparent substrate and the hard coat components are mixed and cured are formed.
  • the interface between the substrate layer 2 and the compatible layer 4, and the interface between the compatible layer 4 and the outermost layer 3 can be confirmed by observing the cross section of the protective film A using a scanning electron microscope (SEM), and the thicknesses of the substrate layer 2, the compatible layer 4, and the outermost layer 3 can be identified from the SEM image.
  • the thickness of the compatible layer 4 can be controlled by the drying time and drying temperature after application of the hard coat layer forming composition. For example, if the drying time is extended, the swelling or dissolution of the transparent substrate by the solvent proceeds more, and the compatible layer 4 can be made thicker. In addition, if the drying temperature is increased, the drying proceeds more quickly, suppressing the swelling or dissolution of the transparent substrate by the solvent and allowing the compatible layer 4 to be made thinner.
  • a monofunctional, difunctional, trifunctional or higher functional (meth)acrylate monomer can be used as the active energy ray curable compound.
  • (meth)acrylate is a general term for both acrylate and methacrylate
  • (meth)acryloyl is a general term for both acryloyl and methacryloyl.
  • Examples of monofunctional (meth)acrylate compounds include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, glycidyl (meth)acrylate, acryloylmorpholine, N-vinylpyrrolidone, tetrahydrofurfuryl acrylate, cyclohexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isobornyl (meth)acrylate, and isodecyl (meth)acrylate.
  • bifunctional (meth)acrylates include di(meth)acrylates such as ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, butanediol di(meth)acrylate, hexanediol di(meth)acrylate, nonanediol di(meth)acrylate, ethoxylated hexanediol di(meth)acrylate, propoxylated hexanediol di(meth)acrylate, diethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, ethoxylated neopentyl glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, and hydroxypivalic acid neopentyl
  • trifunctional or higher (meth)acrylates examples include tri(meth)acrylates such as trimethylolpropane tri(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, propoxylated trimethylolpropane tri(meth)acrylate, tris-2-hydroxyethyl isocyanurate tri(meth)acrylate, and glycerin tri(meth)acrylate, as well as trifunctional (meth)acrylate compounds such as pentaerythritol tri(meth)acrylate, dipentaerythritol tri(meth)acrylate, and ditrimethylolpropane tri(meth)acrylate.
  • tri(meth)acrylates such as trimethylolpropane tri(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, propoxylated trimethylolpropane tri(meth)acrylate, tris-2-hydroxyethyl iso
  • polyfunctional (meth)acrylate compounds include trifunctional or higher polyfunctional (meth)acrylate compounds such as pentaerythritol tetra(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate, dipentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, ditrimethylolpropane penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, and ditrimethylolpropane hexa(meth)acrylate, as well as polyfunctional (meth)acrylate compounds in which a portion of these (meth)acrylates is substituted with an alkyl group or ⁇ -caprolactone.
  • trifunctional or higher polyfunctional (meth)acrylate compounds such as pentaerythritol tetra(meth)acrylate, ditrimethylolpropane tetra(
  • urethane (meth)acrylate can be used as a polyfunctional monomer.
  • urethane (meth)acrylate include those obtained by reacting a polyester polyol with an isocyanate monomer or a prepolymer, and then reacting the resulting product with a (meth)acrylate monomer having a hydroxyl group.
  • urethane (meth)acrylates examples include pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate hexamethylene diisocyanate urethane prepolymer, pentaerythritol triacrylate toluene diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate toluene diisocyanate urethane prepolymer, pentaerythritol triacrylate isophorone diisocyanate urethane prepolymer, dipentaerythritol pentaacrylate isophorone diisocyanate urethane prepolymer, etc.
  • the above-mentioned polyfunctional monomers may be used alone or in combination of two or more.
  • the above-mentioned polyfunctional monomers may be monomers in the composition, or may be partially polymerized oligomers.
  • the hydrophobic material is a component that imparts hydrophobicity to the hard coat layer and adjusts the moisture permeability of protective film A.
  • Cycloolefin polymers and (meth)acrylates containing an alicyclic structure can be used as hydrophobic materials contained in the hard coat layer.
  • the (meth)acrylate containing an alicyclic structure for example, a (meth)acrylate having one or more of a cyclopentane structure, a dicyclopentane structure, a cyclohexane structure, a cyclodecane structure, a tricyclodecane structure, an isobornyl structure, and an adamantane structure can be used.
  • (meth)acrylates containing an alicyclic structure include cyclohexyl (meth)acrylate, cyclohexanedimethanol mono(meth)acrylate, 4-tert-butylcyclohexyl (meth)acrylate, 3,3,5-trimethylcyclohexyl (meth)acrylate, 3,3,5-trimethylcyclohexanol (meth)acrylate, dicyclopentanyl (meth)acrylate, dicyclopentenyl (meth)acrylate, and dicyclopentadienyl (meth)acrylate.
  • monofunctional (meth)acrylates such as 2-dicyclopentenoxyethyl (meth)acrylate, dicyclopentenyloxyethyl methacrylate, bornyl (meth)acrylate, isobornyl (meth)acrylate, tricyclodecanyl (meth)acrylate, tricyclodecane dimethanol mono(meth)acrylate, and adamantyl (meth)acrylate; cyclohexane dimethanol di(meth)acrylate, dicyclopentanyl di(meth)acrylate, dicyclopentanyl methacrylate, and the like; dicyclopentadienyl di(meth)acrylate, bornyl di(meth)acrylate, isobornyl di(meth)acrylate, tricyclodecanyl di(meth)acrylate, tricyclodecane dimethanol di(meth)acrylate, adamantyl di(meth)acrylate, adamantane dimethanol di(meth
  • radical polymerization initiators such as acetophenone, benzophenone, thioxanthone, benzoin, benzoin methyl ether, and acylphosphine oxide can be used.
  • a polymerization initiator for example, diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide, bis (2,4,6-trimethylbenzoyl) phenylphosphine oxide, 2,2-diethoxyacetophenone, 1-hydroxycyclohexyl phenyl ketone, 2,2-dimethoxy-phenylacetophenone, dibenzoyl, benzoin, benzoin methyl ether, benzoin ethyl ether, p-chlorobenzophenone, p-methoxybenzophenone, Michler's ketone, acetophenone, and 2-chlorothioxanthone can be used.
  • One of these may be used alone, or two or more may be
  • the solvent may be any solvent capable of swelling or dissolving the transparent substrate, and may be one or more of the following solvents, such as alcohols (e.g., methanol, ethanol, 1-propanol, 2-propanol, butanol, isopropyl alcohol, isobutanol, etc.); ketones (e.g., acetone, methyl ethyl ketone, cyclohexanone, methyl isobutyl ketone, etc.); ketone alcohols (e.g., diacetone alcohol, etc.); aromatic hydrocarbons (e.g., benzene, toluene, xylene, etc.); glycols (e.g., ethylene glycol, propylene glycol, hexylene glycol, etc.); glycol ethers (e.g., ethyl cellosolve, butyl cellosolve, ethyl carbitol, butyl carbitol, diethy
  • additives such as antistatic agents, defoamers, antioxidants, ultraviolet absorbers, infrared absorbers, colorants, light stabilizers, polymerization inhibitors, photosensitizers, antifouling agents, leveling agents, oil repellents, water repellents, and fingerprint prevention agents may be added to the composition for forming the hard coat layer as necessary.
  • the method for applying the composition for forming the hard coat layer is not particularly limited, and for example, it can be applied using a spin coater, roll coater, reverse roll coater, gravure coater, microgravure coater, knife coater, bar coater, wire bar coater, die coater, dip coater, spray coater, applicator, etc.
  • the coating thickness of the composition for forming a hard coat layer is preferably 8 ⁇ m or less. If the coating thickness of the composition for forming a hard coat layer exceeds 8 ⁇ m, curling is likely to occur due to shrinkage during curing, which is not preferred.
  • the coating thickness of the composition for forming a hard coat layer is more preferably 6 to 7 ⁇ m.
  • the pencil hardness of protective film A (hard coat film) is 3H or more. If the pencil hardness of protective film A is 3H or more, the polarizing plate will have excellent surface hardness and improved durability.
  • Protective film B is a low moisture permeable film made of any one of cycloolefin polymer (COP), polyethylene terephthalate (PET), and polymethyl methacrylate (PMMA).
  • COP cycloolefin polymer
  • PET polyethylene terephthalate
  • PMMA polymethyl methacrylate
  • Protective film B is attached to polarizer 1 via, for example, an ultraviolet-curable adhesive.
  • the thickness of protective film B is not particularly limited, but is preferably 10 to 100 ⁇ m.
  • protective film B is placed on the display panel side, and the hard coat layer of protective film A is placed on the viewing side (the side opposite the display panel).
  • the transparent substrate (substrate layer 2) of protective film A is bonded to the PVA film of polarizer 1 using water-based glue (PVA aqueous solution) as an adhesive.
  • water-based glue PVA aqueous solution
  • protective film A is subjected to a saponification treatment before bonding. Because water-based glue is used to bond protective film A to polarizer 1, moisture may be present in the adhesive layer and TAC film even after a drying process.
  • both protective films A and B are constructed using films with low moisture permeability, the intrusion of moisture from the outside is suppressed, but in extremely high-temperature environments such as the inside of a car in summer, moisture contained in the adhesive and/or transparent substrate continues to remain in polarizer 10, causing deterioration of polarizer 1.
  • a difference is provided between the moisture permeability of protective film A and that of protective film B, and the moisture permeability of protective film A and protective film B are each set to a specific range, thereby suppressing deterioration of the polarizer 1 due to moisture from the adhesive and/or TAC film.
  • both of the moisture permeabilities TA and TB are values measured in accordance with the moisture permeability test method (cup method) for moisture-proof packaging materials specified in JIS Z 0208:1976. 240 g/m 2 /day>TA>70 g/m 2 /day ... (1) 70 g/m 2 /day ⁇ TB (2)
  • the polarizing plate 10 satisfies the above conditions (1) and (2) simultaneously, and thus can suppress the intrusion of moisture from the outside into the polarizing plate, while discharging moisture generated from the adhesive used to bond the protective film A to the polarizer 1 and/or the transparent substrate of the protective film A to the outside when exposed to a high-temperature environment of, for example, 85° C.
  • the moisture permeability TA is preferably 190 to 240 g/m 2 /day, and more preferably 190 to 220 g/m 2 /day.
  • the polarizing plate 10 is exposed to light from a light source for a long period of time while being incorporated into a display device. Therefore, it is required that the hard coat layer (outermost layer 3) of the protective film A does not peel off due to deterioration even when exposed to light for a long period of time, and that the low moisture permeability and surface hardness of the protective film A can be maintained.
  • the adhesion of the outermost layer 3 is related to the thickness of the compatible layer 4 formed on the protective film A, and if the compatible layer 4 has a certain thickness or more relative to the thickness of the outermost layer 3, the adhesion between the outermost layer 3 and the base layer 2 will be good.
  • the thickness of the compatible layer 4 also affects the low moisture permeability of the protective film A. When the coating thickness of the composition for forming a hard coat layer is constant, the thicker the compatible layer 4, the thinner the thickness of the outermost layer 3, which contributes greatly to the low moisture permeability, and therefore the lower the moisture permeability.
  • the protective film A according to this embodiment is formed so that the thickness a of the outermost layer 3 and the thickness b of the compatible layer 4 satisfy the following condition (3). 0.60 ⁇ a/b ⁇ 0.85 (3)
  • the thickness of the compatible layer 4 is sufficiently thick relative to the thickness of the outermost layer 3, so that the adhesion of the outermost layer 3 to the base layer 2 is good.
  • the thickness of the compatible layer 4 is formed thick, the thickness of the outermost layer 3 is insufficient, so that the moisture permeability is high, and condition (1) cannot be satisfied.
  • a/b exceeds 0.85 the outermost layer 3 becomes thick, so that the moisture permeability is low, but the thickness of the compatible layer 4 is insufficient relative to the thickness of the outermost layer 3, so that the adhesion of the outermost layer 3 to the base layer 2 is deteriorated.
  • a/b is more preferably 0.61 to 0.83, and more preferably 0.69 to 0.83.
  • the thickness a of the outermost layer 3 is preferably 2.9 to 3.6 ⁇ m, and more preferably 3.1 to 3.6 ⁇ m.
  • the thickness b of the compatible layer 4 is preferably 4.1 to 4.9 ⁇ m, and more preferably 4.1 to 4.8 ⁇ m.
  • the polarizing plate 10 includes protective film A and protective film B that satisfy the above conditions (1) to (3).
  • protective film B arranged on the display panel side almost completely blocks the ingress and egress of moisture.
  • protective film A arranged on the viewing side allows the release of moisture generated inside the polarizing plate 10 in an extremely high-temperature environment while suppressing the ingress of moisture into the polarizing plate 10 from the outside. Therefore, in the polarizing plate 10 according to this embodiment, when used in a high-temperature environment, moisture generated inside the polarizing plate 10 does not remain, suppressing deterioration of the polarizer and making it possible to maintain the optical performance of the polarizing plate 10 for a longer period of time.
  • the thicknesses of the outermost layer 3 and the compatible layer 4 of the protective film A satisfy the above condition (3), it is possible to suppress the moisture permeability of the protective film A, while suppressing deterioration due to light even when the film is exposed to light for a long period of time, and to maintain the adhesion of the outermost layer 3 to the base layer 2.
  • this embodiment can provide a polarizing plate 10 that has excellent durability in high-temperature and high-humidity environments.
  • the polarizing plate 10 according to this embodiment can be used in combination with an image display panel such as a liquid crystal panel or an organic EL panel to form an image display device.
  • the image display device may also include a touch panel.
  • the polarizing plate 10 according to this embodiment has excellent durability in high temperature and high humidity environments, and can therefore be suitably used as an image display device to be installed in environments such as the inside of a vehicle, which can be extremely hot and humid.
  • a composition for forming a hard coat layer was prepared containing the main material (polymerizable material), hydrophobic material, photopolymerization initiator, and solvent in the ratios shown in Table 1.
  • main material polymerizable material
  • hydrophobic material hydrophobic material
  • photopolymerization initiator solvent
  • solvent solvent
  • Irgacure (registered trademark) 184 shown in Table 1 is 1-hydroxycyclohexyl phenyl ketone
  • TPO is diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide.
  • the prepared hard coat layer forming composition was applied to a 40 ⁇ m thick TAC film (product name: TJ40 manufactured by Fujifilm Corporation) using a wire bar coater to a coating thickness as shown in Table 2. After heating in an oven to dry the coating film, the coating film was cured by irradiating ultraviolet light in a nitrogen atmosphere (oxygen concentration 500 ppm or less) in a UV curing device so that the integrated light amount was 100 mJ/cm 2 , to produce protective film A (hard coat film) according to Examples 1 to 6 and Comparative Examples 1 to 6.
  • protective film A hard coat film
  • Examples 7 and 8 a 60 ⁇ m thick polymethyl methacrylate (PMMA) film and a 26 ⁇ m thick cycloolefin polymer (COP) film were used as protective film A.
  • COP cycloolefin polymer
  • protective film A was attached to the polarizer using water-based glue and then dried.
  • protective film B was attached to the polarizer using a UV-curable adhesive, and the UV-curable adhesive was cured by irradiating it with UV light to obtain a polarizing plate.
  • protective film A was cut in a direction perpendicular to the surface, and the cross section was photographed using a scanning electron microscope (SEM). The thickness a of the outermost layer and the thickness b of the compatible layer were calculated from the cross-sectional image.
  • Adhesive tape (CT405AP-24, Nichiban Co., Ltd.) was attached to the formed squares and pressed evenly with a spatula, and then the adhesive tape was peeled off in a 90° direction, and the presence or absence of peeling of the outermost layer was visually confirmed.
  • peeling occurred in 10% or more of the area of each square, it was judged as peeling, and when there were no squares with peeling, it was evaluated as OK, and when there were one or more squares with peeling, it was evaluated as NG.
  • the polarizing plates according to each of the Examples and Comparative Examples were placed in a thermostatic chamber at 85° C. and 85% RH, and the polarization degree was measured 240 hours and 500 hours after the placement.
  • the polarization degree was calculated by performing luminosity correction using a 2-degree visual field (C light source) according to JIS Z 8701 for a value measured using an absorptiometer with an integrating sphere (V7100, manufactured by JASCO Corporation).
  • Table 2 shows the characteristics of protective films A and B for each example and comparative example, as well as the measured polarization degree of the polarizing plate (initial value, before and after the high temperature and high humidity durability test).
  • the polarizing plates according to Examples 1 to 6 have a moisture permeability TA of protective film A and a moisture permeability TB of protective film B that satisfy the above conditions (1) and (2), and furthermore, the thickness a of the outermost layer and the thickness b of the compatible layer satisfy the above condition (3).
  • a moisture permeability TA of protective film A and a moisture permeability TB of protective film B that satisfy the above conditions (1) and (2), and furthermore, the thickness a of the outermost layer and the thickness b of the compatible layer satisfy the above condition (3).
  • the hard coat layer was formed using a composition for forming a hard coat layer that did not contain a hydrophobic material, so the moisture permeability TA of protective film A was high. As a result, the intrusion of moisture from the outside could not be sufficiently suppressed, and the polarization degree after being placed in a thermostatic chamber at 85°C and 85% RH for 500 hours was lower than in the Examples.
  • Comparative Examples 7 and 8 a PMMA film and a COP film with extremely low moisture permeability TA were used as protective film A, respectively, but the polarization degree deteriorated after being placed in a thermostatic chamber at 85°C and 85% RH for 500 hours. This is thought to be because the moisture permeability TA of protective film A was too low, and when exposed to high temperature and humidity, the moisture contained in protective film A and/or the adhesive (water glue) continued to remain in the polarizing plate, causing deterioration of the polarizer.
  • protective film A in Comparative Examples 7 and 8 had inferior surface hardness compared to the Examples because it did not have a hard coat layer.
  • the present invention can be used as a polarizing plate for display devices, and is particularly suitable as a polarizing plate for display devices used in high-temperature environments such as in-vehicle applications.
  • a Protective Film A A Protective Film A B Protective film B 1 Polarizer 2 Base layer 3 Outermost layer 4 Compatibility layer 10 Polarizing plate

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)
  • Surface Treatment Of Optical Elements (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention concerne : une plaque de polarisation ayant une durabilité dans un environnement à haute température et à humidité élevée ; et un dispositif d'affichage l'utilisant. La présente invention concerne une plaque de polarisation dans laquelle un film protecteur A est adhéré à une surface d'un polariseur et un film protecteur B est adhéré à une autre surface de celle-ci, le film protecteur A est un film de revêtement dur comprenant une couche de revêtement dur formée sur une surface d'un substrat transparent, le film protecteur A comprend une couche de base constituée d'un composant de résine du substrat transparent, une couche la plus à l'extérieur constituée d'un composant de revêtement dur, et une couche compatible qui est formée entre la couche de base et la couche la plus à l'extérieur et comprend le composant de résine du substrat transparent et le composant de revêtement dur mélangés l'un à l'autre, la perméabilité à l'humidité TA du film protecteur A et la perméabilité à l'humidité TB du film protecteur B à 40 °C et 90 % RH satisfont aux conditions (1) et (2) en même temps, et l'épaisseur a de la couche la plus à l'extérieur et l'épaisseur b de la couche compatible satisfont à une condition (3).　(1) : 240 g/m2/jour>TA>70 g/m2/jour (2) : 70 g/m2/jour ≥TB (3) : 0,60≤a/b≤0,85
PCT/JP2023/035745 2022-10-06 2023-09-29 Plaque de polarisation et dispositif d'affichage l'utilisant Ceased WO2024075658A1 (fr)

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CN202380063073.2A CN119790332A (zh) 2022-10-06 2023-09-29 偏光板以及使用了该偏光板的显示装置

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JP2021144076A (ja) * 2020-03-10 2021-09-24 株式会社トッパンＴｏｍｏｅｇａｗａオプティカルフィルム 偏光板及びこれを用いた表示装置
JP2022125845A (ja) * 2021-02-17 2022-08-29 株式会社トッパンＴｏｍｏｅｇａｗａオプティカルフィルム 光学フィルムの製造方法及び偏光板の製造方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021144076A (ja) * 2020-03-10 2021-09-24 株式会社トッパンＴｏｍｏｅｇａｗａオプティカルフィルム 偏光板及びこれを用いた表示装置
JP2022125845A (ja) * 2021-02-17 2022-08-29 株式会社トッパンＴｏｍｏｅｇａｗａオプティカルフィルム 光学フィルムの製造方法及び偏光板の製造方法

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