WO2020158112A1 - Film polyester, et plaque polarisante contenant celui-ci - Google Patents

Film polyester, et plaque polarisante contenant celui-ci Download PDF

Info

Publication number
WO2020158112A1
WO2020158112A1 PCT/JP2019/044776 JP2019044776W WO2020158112A1 WO 2020158112 A1 WO2020158112 A1 WO 2020158112A1 JP 2019044776 W JP2019044776 W JP 2019044776W WO 2020158112 A1 WO2020158112 A1 WO 2020158112A1
Authority
WO
WIPO (PCT)
Prior art keywords
polyester film
polarizer
polarizing plate
linear expansion
film
Prior art date
Application number
PCT/JP2019/044776
Other languages
English (en)
Japanese (ja)
Inventor
清水　享
慎太郎 東
貴博 吉川
池田　哲朗
Original Assignee
日東電工株式会社
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 日東電工株式会社 filed Critical 日東電工株式会社
Priority to JP2020569392A priority Critical patent/JPWO2020158112A1/ja
Priority to KR1020217023474A priority patent/KR20210119986A/ko
Priority to CN201980090909.1A priority patent/CN113366354A/zh
Publication of WO2020158112A1 publication Critical patent/WO2020158112A1/fr
Priority to JP2023129043A priority patent/JP2023159193A/ja

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • 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
    • B32B7/025—Electric or magnetic properties
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
    • C08G63/123—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
    • C08G63/127—Acids containing aromatic rings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
    • C08G63/16—Dicarboxylic acids and dihydroxy compounds
    • C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
    • C08G63/181—Acids containing aromatic rings
    • C08G63/183—Terephthalic acids
    • 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
    • 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
    • G02B5/3025—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
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/42—Polarizing, birefringent, filtering
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds

Definitions

  • the present invention relates to a polyester film and a polarizing plate including the polyester film.
  • a polarizing plate In image display devices (for example, liquid crystal display devices and organic EL display devices), a polarizing plate is often arranged on at least one side of the display cell due to the image forming method. In recent years, image display devices have tended to further diversify their functions and applications, and it is required that they can withstand use in more severe environments.
  • a polarizing plate generally has a structure in which a polarizer is sandwiched between two protective films, and as the protective film, triacetyl cellulose, acrylic resin, cycloolefin resin, etc. are widely used.
  • a polyester film such as polyethylene terephthalate (PET) or polyethylene naphthalate (PEN) having excellent mechanical properties, chemical resistance, and moisture barrier properties is used as a polarizer protective film. It has been proposed (for example, Patent Document 1). However, while the polyester film has excellent mechanical properties, it has birefringence, which may cause visibility deterioration such as rainbow unevenness. In particular, with the recent increase in brightness and color purity of image display devices, such a problem of rainbow unevenness becomes remarkable.
  • PET polyethylene terephthalate
  • PEN polyethylene naphthalate
  • a polarizing plate constituted by using a protective film formed of triacetyl cellulose, an acrylic resin or a cycloolefin resin which has been frequently used, has a crack in the polarizer due to a temperature change.
  • thinning of the polarizer has been required along with the thinning of the image display device, and while the number of image display devices expected to be used at high temperature is increasing, the polarizing plate with excellent durability without cracks in the polarizer. Plates are strongly desired.
  • the present invention has been made to solve the above-mentioned conventional problems, and its main purpose is to reduce the occurrence of rainbow unevenness when applied to an image display device, and may contribute to improving the durability of a polarizing plate. To provide a polyester film.
  • the linear expansion coefficient in the first direction is different from the linear expansion coefficient in the second direction orthogonal to the first direction, and the linear expansion coefficient in the first direction is the second expansion coefficient.
  • the linear expansion coefficient in the second direction is 7.5 ⁇ 10 ⁇ 5 /° C. or less in the first direction.
  • it has a slow axis in the direction of ⁇ 5° to 5°.
  • the coefficient of linear expansion in the first direction is 3.0 ⁇ 10 ⁇ 5 /° C. or less.
  • the polyester film has a crystallinity of 30% or more by DSC measurement.
  • the polyester film is formed from polyethylene terephthalate and/or modified polyethylene terephthalate.
  • the modified polyethylene terephthalate comprises a constitutional unit derived from diethylene glycol, 1,4-butanediol, 1,3-propanediol or isophthalic acid.
  • a polarizing plate is provided. The polarizing plate includes a polarizer and the polyester film arranged on at least one side of the polarizer.
  • the absolute value of the difference between the linear expansion coefficient in the second direction orthogonal to the first direction and the linear expansion coefficient in the direction parallel to the second direction of the polarizer is both 2.0 ⁇ 10 ⁇ 5. /°C or less.
  • the thickness of the above-mentioned polarizer is 20 micrometers or less.
  • the polarizing plate further includes an easy-adhesion layer arranged on the polarizer side of the polyester film.
  • the easily adhesive layer contains fine particles.
  • the thickness of the easy-adhesion layer is 0.35 ⁇ m or less.
  • the easy-adhesion layer has a refractive index of 1.55 or less.
  • the present invention by selectively reducing the linear expansion coefficient in a predetermined direction, the occurrence of rainbow unevenness when combined with a polarizer is small, and a polyester film that can contribute to improving the durability of a polarizing plate. Can be provided.
  • FIG. 1 is a schematic cross-sectional view of a polarizing plate according to an embodiment of the present invention.
  • FIG. 6 is a schematic cross-sectional view of a polarizing plate according to another embodiment of the present invention.
  • polyester film of the present invention is formed so that the linear expansion coefficient in the first direction and the linear expansion coefficient in the second direction orthogonal to the first direction are different.
  • the linear expansion coefficient in the first direction is 1.0 ⁇ 10 ⁇ 5 /° C. or more lower than the linear expansion coefficient in the second direction.
  • a polarizer is usually manufactured to have an absorption axis through a stretching process and has anisotropy in dimensional change (for example, dimensional change caused by temperature change).
  • the polyester film and the polarizer can be tuned and the shape can be preferably changed.
  • the polyester film of the present invention cracking of the polarizer can be prevented even under a severe environment such as high temperature and large temperature change, and a polarizing plate having excellent durability can be obtained.
  • the above-mentioned 1st direction is equivalent to a conveyance direction (MD) at the time of manufacturing a polyester film.
  • the second direction may correspond to TD orthogonal to MD.
  • the linear expansion coefficient can be determined by TMA measurement according to JIS K 7197.
  • the expression “substantially parallel” includes the case where the angle formed by the two directions is 0° ⁇ 10°, preferably 0° ⁇ 7°, and more preferably 0° ⁇ 5°.
  • the linear expansion coefficient in the first direction is preferably lower than the linear expansion coefficient in the second direction by 2.0 ⁇ 10 ⁇ 5 /° C. or more. Within such a range, the above effect becomes more remarkable.
  • the polyester film of the present invention has a slow axis in the -5° to 5° direction with respect to the first direction. Within such a range, it is possible to obtain a polyester film that causes less rainbow unevenness when combined with a polarizer. More specifically, as described above, when the polarizer and the polyester film are laminated so that the absorption axis of the polarizer and the first direction are substantially parallel to each other to form a polarizing plate, rainbow unevenness is effective. Can be prevented.
  • the angle formed by the first direction and the slow axis is preferably -3° to 3°, more preferably -1° to 1°, and particularly preferably -0.5° to 0. It is 5°, most preferably 0°. Within such a range, the above effect becomes more remarkable.
  • the linear expansion coefficient in a first direction of the polyester film is preferably not 3.0 ⁇ 10 -5 / °C less, preferably 0.0 ⁇ 10 -5 /°C ⁇ 2.5 ⁇ 10 -5 / °C And more preferably more than 0.0 ⁇ 10 ⁇ 5 /° C. and 1.8 ⁇ 10 ⁇ 5 /° C. or less. Within such a range, it is possible to obtain a polyester film which can be laminated on a polarizer to effectively protect the polarizer and prevent cracking of the polarizer.
  • the linear expansion coefficient of the polyester film in the second direction is 7.5 ⁇ 10 ⁇ 5 /° C. or less, preferably more than 2.0 ⁇ 10 ⁇ 5 /° C. and 7.5 ⁇ 10 ⁇ 5 /° C. or less. by weight, more preferably from 3.5 ⁇ 10 -5 /°C ⁇ 5.5 ⁇ 10 -5 / °C , more preferably 3.0 ⁇ 10 -5 /°C ⁇ 5.0 ⁇ 10 -5 / °C Is.
  • the polyester film may be a stretched film obtained through a stretching process.
  • the manufacturing conditions in the stretching step and the linear expansion coefficient (and the in-plane retardation Re(590) described later) in the first direction and the second direction can be well controlled.
  • a polyester film having excellent properties as a polarizer protective film can be obtained from the viewpoints of rainbow unevenness and durability as described above.
  • stretching conditions stretch temperature, stretching ratio, stretching speed, MD/TD stretching order
  • preheating temperature before stretching heat treatment temperature after stretching, heat treatment time after stretching, MD/TD direction after stretching
  • the relaxation rate and the like The stretching temperature, the stretching ratio and the stretching speed can be appropriately adjusted for each MD/TD.
  • the in-plane retardation Re(590) of the polyester film is, for example, more than 0 nm and 10,000 nm or less.
  • the in-plane retardation Re( ⁇ ) is the in-plane retardation of the film measured with light having a wavelength of ⁇ nm at 23°C. Therefore, Re(590) is the in-plane retardation of the film measured with light having a wavelength of 590 nm.
  • nx is the refractive index in the direction in which the in-plane refractive index becomes maximum (that is, the slow axis direction), and ny is the refractive index in the in-plane direction orthogonal to the slow axis.
  • the above-mentioned polyester film has a crystallinity measured by differential scanning calorimetry (DSC) of preferably 30% or more, more preferably 40% or more, and further preferably 50% or more.
  • the upper limit of the crystallinity is, for example, 70%. Within such a range, a polyester film having excellent heat resistance and mechanical properties and suitable as a polarizer protective film can be obtained.
  • the thickness of the polyester film is typically 10 ⁇ m to 100 ⁇ m, preferably 20 ⁇ m to 80 ⁇ m, and more preferably 20 ⁇ m to 50 ⁇ m.
  • the total light transmittance of the polyester film is preferably 80% or more, more preferably 85% or more, still more preferably 90% or more, and particularly preferably 95% or more.
  • the haze of the polyester film is preferably 1.0% or less, more preferably 0.7% or less, still more preferably 0.5% or less, and particularly preferably 0.3% or less.
  • the water vapor permeability of the polyester film is preferably 100 g/m 2 ⁇ 24 hr or less, more preferably 50 g/m 2 ⁇ 24 hr or less, and further preferably 15 g/m 2 ⁇ 24 hr or less. Within such a range, a polarizing plate excellent in durability and moisture resistance can be obtained.
  • the polyester film of the present invention is formed from a polyester resin.
  • the polyester resin can be obtained by condensation polymerization of a carboxylic acid component and a polyol component.
  • Carboxylic acids include aromatic dicarboxylic acids, aliphatic dicarboxylic acids, and alicyclic dicarboxylic acids.
  • aromatic dicarboxylic acid include terephthalic acid, isophthalic acid, benzylmalonic acid, 1,4-naphthalic acid, diphenic acid, 4,4'-oxybenzoic acid and 2,5-naphthalenedicarboxylic acid.
  • aliphatic dicarboxylic acid examples include malonic acid, dimethylmalonic acid, succinic acid, glutaric acid, adipic acid, trimethyladipic acid, pimelic acid, 2,2-dimethylglutaric acid, azelaic acid, zebacic acid, fumaric acid, Maleic acid, itaconic acid, thiodipropionic acid, diglycolic acid may be mentioned.
  • Examples of the alicyclic dicarboxylic acid include 1,3-cyclopentanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 1,3-cyclopentanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid and 2,5-norbornanedicarboxylic acid. Examples thereof include acids and adamantane dicarboxylic acids.
  • the carboxylic acid component may be a derivative such as an ester, a chloride or an acid anhydride, and examples thereof include dimethyl 1,4-cyclohexanedicarboxylate, dimethyl 2,6-naphthalenedicarboxylate, dimethyl isophthalate and dimethyl terephthalate. And diphenyl terephthalate.
  • the carboxylic acid components may be used alone or in combination of two or more.
  • a typical example of the polyol component is a dihydric alcohol.
  • the dihydric alcohol include aliphatic diols, alicyclic diols, and aromatic diols.
  • the aliphatic diol include ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, 1,3-propanediol, 2,4-dimethyl-2-ethylhexane-1,3-diol, 2, 2-Dimethyl-1,3-propanediol (neopentyl glycol), 2-ethyl-2-butyl-1,3-propanediol, 2-ethyl-2-isobutyl-1,3-propanediol, 1,3- Examples include butadiol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 3-methyl-1,5-pentaned
  • alicyclic diol examples include 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, spiroglycol, tricyclodecanedimethanol, adamantanediol, 2,2,4. , 4-tetramethyl-1,3-cyclobutanediol.
  • aromatic diols examples include 4,4'-thiodiphenol, 4,4'-methylenediphenol, 4,4'-(2-norbornylidene)diphenol, 4,4'-dihydroxybiphenol, o-, Mention may be made of m- and p-dihydroxybenzene, 4,4'-isopropylidenephenol, 4,4'-isopropylidenebis(2,6-cyclolophenol)2,5-naphthalenediol and p-xylenediol.
  • the polyol component may be used alone or in combination of two or more kinds.
  • polyester resin polyethylene terephthalate and/or modified polyethylene terephthalate is preferably used, and more preferably polyethylene terephthalate is used. By using these resins, it is possible to obtain a polyester film which has excellent mechanical properties and has less rainbow unevenness. Polyethylene terephthalate and modified polyethylene terephthalate may be blended and used.
  • modified polyethylene terephthalate examples include modified polyethylene terephthalate containing a constitutional unit derived from diethylene glycol, 1,4-butanediol, 1,3-propanediol or isophthalic acid.
  • the proportion of diethylene glycol in the polyol component is preferably more than 0 mol% and 10 mol% or less, more preferably more than 0 mol% and 3 mol% or less.
  • the proportion of 1,4-butanediol in the polyol component is preferably more than 0 mol% and 10 mol% or less, more preferably more than 0 mol% and 3 mol% or less.
  • the proportion of 1,3-propanediol in the polyol component is preferably more than 0 mol% and 10 mol% or less, more preferably more than 0 mol% and 3 mol% or less.
  • the proportion of isophthalic acid in the carboxylic acid component is preferably more than 0 mol% and 10 mol% or less, more preferably more than 0 mol% and 8 mol% or less. Within such a range, a polyester film having good crystallinity can be obtained.
  • the mol% described above is the mol% based on the total of all repeating units of the polymer.
  • the weight average molecular weight of the polyester resin is preferably 10,000 to 100,000, more preferably 20,000 to 75,000. With such a weight average molecular weight, a film that is easy to handle during molding and has excellent mechanical strength can be obtained.
  • the weight average molecular weight can be measured by GPC (solvent: THF).
  • a polyester film with an easily adhesive layer is provided.
  • the easy-adhesion layer contains, for example, a water-based polyurethane and an oxazoline-based crosslinking agent. Details of the easy-adhesion layer are described in, for example, JP-A-2010-55062. The entire disclosure of this publication is incorporated herein by reference.
  • the easy-adhesion layer contains any appropriate fine particles.
  • the fine particles may be inorganic fine particles or organic fine particles.
  • the inorganic fine particles include silica, titania, alumina, zirconia, and other inorganic oxides, calcium carbonate, talc, clay, calcined kaolin, calcined calcium silicate, hydrated calcium silicate, aluminum silicate, magnesium silicate, calcium phosphate, and the like.
  • the organic fine particles include silicone resins, fluorine resins, (meth)acrylic resins, and the like. Of these, silica is preferable.
  • the particle size (number average primary particle size) of the fine particles is preferably 10 nm to 200 nm, more preferably 20 nm to 60 nm.
  • the thickness of the easily adhesive layer is preferably 2 ⁇ m or less, more preferably 1 ⁇ m or less, and further preferably 0.35 ⁇ m or less. Within such a range, it is possible to obtain a polyester film with an easy-adhesion layer that is hard to impair the optical characteristics of other members when applied to an image display device.
  • the refractive index of the easy-adhesion layer is preferably 1.45 to 1.60. Within such a range, it is possible to obtain a polyester film with an easy-adhesion layer that is hard to impair the optical characteristics of other members when applied to an image display device. In one embodiment, the easy-adhesion layer has a refractive index of 1.54 or more.
  • the polyester film may include an antiblock layer on at least one side thereof.
  • the structure of the anti-block layer the structure of the easy-adhesion layer described above can be adopted.
  • the antiblock layer contains the fine particles.
  • the polyester film can be obtained through a molding step of molding a film-forming material (resin composition) containing the polyester resin into a film, and a stretching step of stretching the molded film.
  • the stretching step includes a preheat treatment of the film performed before the film stretching and a heat treatment performed after the film stretching.
  • the polyester film is provided in an elongated shape (or a shape cut out from an elongated body).
  • the film-forming material may contain an additive or a solvent in addition to the polyester resin.
  • an additive any appropriate additive can be adopted depending on the purpose. Specific examples of additives include reactive diluents, plasticizers, surfactants, fillers, antioxidants, antioxidants, ultraviolet absorbers, leveling agents, thixotropic agents, antistatic agents, conductive materials, flame retardants. Are listed. The number, type, combination, addition amount, etc. of the additives can be appropriately set according to the purpose.
  • any appropriate forming method can be adopted. Specific examples include compression molding method, transfer molding method, injection molding method, extrusion molding method, blow molding method, powder molding method, FRP molding method, cast coating method (for example, casting method), calender molding method, heat press. Law etc. are mentioned.
  • An extrusion molding method or a cast coating method is preferable. This is because the smoothness of the obtained film can be improved and good optical uniformity can be obtained.
  • the method of stretching the film may be uniaxial stretching or biaxial stretching.
  • uniaxial stretching is adopted as a stretching method for the film, and the film is stretched in the longitudinal direction (MD).
  • the biaxial stretching may be sequential biaxial stretching or simultaneous biaxial stretching. Sequential biaxial stretching or simultaneous biaxial stretching is typically performed using a tenter stretching machine. Therefore, the stretching direction of the film is typically the length direction (MD) and the width direction (TD) of the film.
  • sequential biaxial stretching is adopted as the stretching method for the film.
  • MD stretching is preferably performed to obtain the polyester film. By doing so, it becomes possible to reduce the influence of bowing that occurs during TD stretching and to make the angle between the slow axis and the first direction (MD) in the polyester film an appropriate value. ..
  • the stretching temperature is preferably Tg+5° C. to Tg+50° C. with respect to the glass transition temperature (Tg) of the film, more preferably Tg+5° C. to Tg+30° C., and further preferably Tg+6° C. to Tg+10° C.
  • Tg glass transition temperature
  • the draw ratio in MD is preferably 2 to 7 times, more preferably 2.5 to 6.5 times, and further preferably 3 to 6 times. Within such a range, a polyester film having good crystallinity and excellent durability can be obtained while keeping the coefficient of linear expansion within a desired range.
  • the stretch ratio in TD is preferably 1 to 4.5 times, more preferably 1.2 to 4 times, and further preferably 1.5 to 3.5 times. Within such a range, a polyester film having good crystallinity and excellent durability can be obtained while keeping the coefficient of linear expansion within a desired range.
  • the ratio of the draw ratio in TD and the draw ratio in MD is preferably more than 1 and 7 or less, more preferably 1 to 6, and still more preferably 1 to 3. .. Within such a range, it is possible to obtain a polyester film in which the occurrence of rainbow unevenness is particularly small. Further, by using the obtained polyester film, it is possible to prevent cracking of the polarizer and obtain a polarizing plate having excellent durability.
  • the stretching speed in MD is preferably 5%/sec to 100%/sec, more preferably 8%/sec to 80%/sec, and further preferably 8%/sec to 60%/sec. Within such a range, a polyester film having excellent optical properties, good crystallinity, and excellent durability can be obtained.
  • the stretching speed in TD is preferably 5%/sec to 100%/sec, more preferably 8%/sec to 80%/sec, and further preferably 8%/sec to 60%/sec. Within such a range, a polyester film having excellent optical properties, good crystallinity, and excellent durability can be obtained.
  • the temperature of the preheat treatment is preferably 80°C to 150°C, more preferably 90°C to 130°C.
  • the preheat treatment time is preferably 10 seconds to 100 seconds, more preferably 15 seconds to 80 seconds. Within such a range, a polyester film having excellent optical properties, good crystallinity, and excellent durability can be obtained.
  • the temperature of the heat treatment is preferably 100°C to 250°C, more preferably 120°C to 200°C, and further preferably 130°C to 180°C. Within such a range, a polyester film having excellent transparency, good crystallinity, and excellent durability can be obtained.
  • the heat treatment time is preferably 2 seconds to 50 seconds, more preferably 5 seconds to 40 seconds, and further preferably 8 seconds to 30 seconds. Within such a range, a polyester film having excellent transparency, good crystallinity, and excellent durability can be obtained.
  • FIG. 1 is a schematic cross-sectional view of a polarizing plate according to one embodiment of the present invention.
  • the polarizing plate 100 includes a polarizer 10 and a polyester film 20 arranged on one side of the polarizer 10.
  • the polyester film 20 the polyester film of the present invention described in the section A is used. Any other suitable polarizer protective film may be disposed on the other side of the polarizer, and the polarizer protective film may not be disposed.
  • the polarizer 10 and the polyester film 20 are laminated via the adhesive layer 30.
  • the polarizing plate may be applied to the image display device such that the side on which the polyester film is arranged is the viewing side.
  • the polarizing plate including the polyester film may be arranged on the viewing side or the back side of the liquid crystal cell.
  • the resin film forming the polarizer may be a single-layer resin film or a laminate of two or more layers.
  • the polarizer composed of a single-layer resin film include hydrophilic polymer films such as polyvinyl alcohol (PVA) film, partially formalized PVA film, and ethylene/vinyl acetate copolymer partially saponified film.
  • hydrophilic polymer films such as polyvinyl alcohol (PVA) film, partially formalized PVA film, and ethylene/vinyl acetate copolymer partially saponified film.
  • PVA polyvinyl alcohol
  • partially formalized PVA film partially formalized PVA film
  • ethylene/vinyl acetate copolymer partially saponified film examples thereof include polyene oriented films such as those that have been subjected to dyeing treatment and stretching treatment with a dichroic substance such as iodine or a dichroic dye, and dehydrated products of PVA and dehydrochlorinated products of polyvinyl chloride.
  • a polarizer obtained by dyeing a PVA-based film with iodine and uniaxially stretching it is used
  • the above dyeing with iodine is performed, for example, by immersing the PVA film in an aqueous iodine solution.
  • the stretching ratio of the uniaxial stretching is preferably 3 to 7 times. Stretching may be performed after the dyeing treatment or may be performed while dyeing. Further, it may be stretched and then dyed.
  • the PVA-based film is subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment and the like. For example, by immersing the PVA-based film in water and washing it before dyeing, not only can the stains on the surface of the PVA-based film and the anti-blocking agent be washed, but also the PVA-based film can be swollen to prevent uneven dyeing. Can be prevented.
  • the polarizer obtained using the laminated body include a laminated body of a resin base material and a PVA-based resin layer (PVA-based resin film) laminated on the resin base material, or a resin base material and the resin.
  • a polarizer obtained by using a laminate with a PVA-based resin layer formed by coating on a base material examples thereof include a polarizer obtained by using a laminate with a PVA-based resin layer formed by coating on a base material.
  • a polarizer obtained by using a laminate of a resin base material and a PVA-based resin layer formed by coating on the resin base material is, for example, a resin base material obtained by applying a PVA-based resin solution to the resin base material and drying the solution.
  • a PVA-based resin layer is formed thereon to obtain a laminate of a resin base material and a PVA-based resin layer; and the PVA-based resin layer is used as a polarizer by stretching and dyeing the laminate.
  • the stretching typically includes dipping the laminate in a boric acid aqueous solution and stretching. Further, the stretching may further include, if necessary, stretching the laminate at high temperature (for example, 95° C. or higher) in air before stretching in the aqueous boric acid solution.
  • the resin base material/polarizer laminate thus obtained may be used as it is (that is, the resin base material may be used as a protective layer of the polarizer), or the resin base material is peeled from the resin base material/polarizer laminate.
  • any appropriate protective layer depending on the purpose may be laminated on the peeled surface and used. Details of the method for manufacturing such a polarizer are described in, for example, Japanese Patent Application Laid-Open No. 2012-73580. The entire disclosure of this publication is incorporated herein by reference.
  • the thickness of the polarizer is, for example, 1 ⁇ m to 80 ⁇ m. In one embodiment, the thickness of the polarizer is preferably 20 ⁇ m or less, more preferably 3 ⁇ m to 15 ⁇ m.
  • the polarizer and the polarizer protective film may be laminated via any appropriate adhesive layer.
  • the adhesive layer is formed from an adhesive composition containing a polyvinyl alcohol resin.
  • the absorption axis direction of the polarizer and the first direction (typically MD) of the polyester film are substantially parallel to each other. If the polarizing plate is configured such that the absorption axis of the polarizer and the first direction of the polyester film are substantially parallel to each other, the polyester film and the polarizer can be tuned and the shape can be preferably changed. As a result, cracking of the polarizer is prevented.
  • the slow axis angle of the polyester film is preferably the same as the angle formed by the absorption axis direction of the polarizer, and the angle formed by the two axes is preferably 0° ⁇ 10°, more preferably 0° ⁇ 7°. Yes, and more preferably 0° ⁇ 5°. Within such a range, it is possible to obtain a polyester film with less rainbow unevenness when applied to an image display device.
  • the slow axis angle is an angle when the roll flow direction is 0°.
  • the absolute value of the difference between the linear expansion coefficient of the polyester film in the first direction and the linear expansion coefficient of the polarizer in the direction parallel to the first direction is preferably 2.0 ⁇ 10 ⁇ . It is 5 /° C. or less, more preferably 1.5 ⁇ 10 ⁇ 5 /° C. or less, still more preferably 1.0 ⁇ 10 ⁇ 5 /° C. or less. Within such a range, cracking of the polarizer can be prevented even under a severe environment such as high temperature and large temperature change.
  • the lower limit of the absolute value of the difference between the linear expansion coefficient of the polyester film in the first direction and the linear expansion coefficient of the polarizer in the direction parallel to the first direction is preferably as small as possible. It can be -5 /°C.
  • the absolute value of the difference between the linear expansion coefficient of the polyester film in the second direction (the direction orthogonal to the first direction) and the linear expansion coefficient of the polarizer in the direction parallel to the second direction is preferably 2.0 ⁇ 10 ⁇ 5 /° C. or less, more preferably 1.5 ⁇ 10 ⁇ 5 /° C. or less, still more preferably 1.0 ⁇ 10 ⁇ 5 /° C. or less. Within such a range, cracking of the polarizer can be prevented even under a severe environment such as high temperature and large temperature change.
  • the lower limit of the absolute value of the difference between the linear expansion coefficient of the polyester film in the second direction and the linear expansion coefficient of the polarizer in the direction parallel to the second direction is preferably as small as possible. It can be -5 /°C.
  • the absolute value of the difference between the linear expansion coefficient of the polyester film in the first direction and the linear expansion coefficient of the polarizer in the direction parallel to the first direction, and the second value of the polyester film is both 2.0 ⁇ 10 ⁇ 5. /° C. or less (preferably 1.0 ⁇ 10 ⁇ 5 /° C. or less). Within such a range, cracking of the polarizer can be prevented even under a severe environment such as high temperature and large temperature change.
  • FIG. 2 is a schematic sectional view of a polarizing plate according to another embodiment of the present invention.
  • the polarizing plate 200 further includes an easy-adhesion layer 40 arranged on the polarizer 10 side of the polyester film 20.
  • the easy-adhesion layer-attached polyester film A is arranged on the polarizer 10 such that the easy-adhesion layer 40 is on the polarizer 10 side.
  • the easy-adhesion layer the easy-adhesion layer described in the above section A can be adopted.
  • the polarizing plate can be applied to an image display device.
  • Typical examples of the image display device include a liquid crystal display device and an organic electroluminescence (EL) display device. Since the image display device has a configuration well known in the industry, detailed description thereof will be omitted.
  • the polarizer measured the linear expansion coefficient of the polarizing plate in the direction parallel to the MD and the direction parallel to the TD.
  • Crystallinity The crystallinity of the polyester films used in Examples and Comparative Examples was measured by differential scanning calorimetry (DSC). The calorific value and the heat of fusion observed during the temperature rising of the sample to 300° C. at 10° C./min were calculated, and the crystallinity was calculated by the following formula. The calorific value and the heat of fusion were measured using TA Instruments Q-2000.
  • Crystallinity (%) (calorific value of fusion obtained by measurement ⁇ calorific value obtained by measurement)/crystallinity of 100% Polyethylene terephthalate heat of fusion (119 mJ/mg) ⁇ 100 (4) Nijimura
  • the liquid crystal cell was taken out from the liquid crystal TV "45UH7500" manufactured by LGD, and the polarizing plate on the backlight side was peeled off.
  • the polarizing plate obtained in each of the examples and comparative examples was attached to the surface of the liquid crystal TV from which the polarizing plate was peeled off with an adhesive agent so that the absorption axis of the polarizer was on the short side of the liquid crystal TV.
  • the following samples were prepared. A surface of the polarizing plate on which the protective film (polyester film) was not laminated was bonded to a 0.5 mm-thick non-alkali glass via an acrylic pressure-sensitive adhesive to prepare a sample. The obtained sample was put in the test area of the thermal shock tester, and the temperature in the test area was lowered to -40°C over 30 minutes from room temperature. Then, after raising the temperature in the test area to 85° C. over 30 minutes, the temperature was lowered again to ⁇ 40° C. over 30 minutes. The step of raising the temperature from ⁇ 40° C. to 85° C. and lowering it again to ⁇ 40° C.
  • a PVA-based resin layer was formed to produce a laminate.
  • the obtained laminate was uniaxially stretched 2.0 times in the longitudinal direction (longitudinal direction) between rolls having different peripheral speeds in an oven at 120° C. (in-air auxiliary stretching).
  • the laminated body was immersed in an insolubilizing bath having a liquid temperature of 30° C.
  • the laminate is immersed in a cleaning bath (liquid solution obtained by mixing 4 parts by weight of potassium iodide with 100 parts by weight of water) having a liquid temperature of 30° C. (cleaning treatment), and a peelable substrate is provided.
  • a cleaning bath liquid solution obtained by mixing 4 parts by weight of potassium iodide with 100 parts by weight of water having a liquid temperature of 30° C. (cleaning treatment), and a peelable substrate is provided.
  • a polarizer was obtained.
  • the obtained amorphous polyester-based resin film was simultaneously biaxially stretched by a Bruckner stretching machine KAROIV to obtain a polyester film A (slow axis angle to length direction: -1.3°, in-plane phase Re (590): 142 nm, thickness: 20 ⁇ m) was obtained.
  • the stretching ratio was 5 times in the length direction (MD) and 2 times in the width direction (TD).
  • the stretching temperature was 90° C., and the stretching speed was 30%/sec for both MD and TD. Further, after the stretching treatment, heat treatment was performed at 180° C. for 10 seconds while maintaining the dimensions.
  • a single-screw extruder manufactured by Toyo Seiki Co., screw diameter 25 mm, cylinder setting temperature: 280° C.), T die (width 500 mm, setting temperature: 280° C.), chill roll (setting temperature: 50) C.
  • a film forming apparatus equipped with a winder were used to produce an amorphous polyester resin film having a thickness of 200 ⁇ m.
  • the obtained amorphous polyester-based resin film was simultaneously biaxially stretched by a Bruckner stretching machine KAROIV to obtain a polyester film C (slow axis angle relative to length direction: -0.5°, in-plane phase Re). (590): 80 nm, thickness: 17 ⁇ m) was obtained.
  • the stretching ratio was 4 times in the length direction (MD) and 3 times in the width direction (TD).
  • the stretching temperature was 90° C., and the stretching speed was 30%/sec for both MD and TD. Further, after the stretching treatment, heat treatment was performed at 180° C. for 10 seconds while maintaining the dimensions.
  • polyester film D The stretching ratio was set to 3 times in the length direction (MD) and 3 times in the width direction (TD), and the stretching speed was set to 2%/sec for both MD and TD.
  • Polyester film D (slow axis angle to length direction: ⁇ 2.5°, in-plane phase Re(590): 271 nm) was manufactured in the same manner as in Production Example 2 except that heat treatment was performed at 140° C. for 10 seconds after the stretching treatment. , Thickness: 22 ⁇ m) was obtained.
  • polyester film E The stretching ratio was twice in the length direction (MD) and twice in the width direction (TD), and the stretching speed was 2%/sec in both MD and TD.
  • Polyester film E (slow axis angle relative to length direction: -11.9°, in-plane phase Re(590): 54 nm) was manufactured in the same manner as in Production Example 2 except that the heat treatment was performed at 140° C. for 10 seconds after the stretching treatment. , Thickness: 50 ⁇ m) was obtained.
  • a single-screw extruder manufactured by Toyo Seiki Co., screw diameter 25 mm, cylinder setting temperature: 280° C.), T die (width 500 mm, setting temperature: 280° C.), chill roll (setting temperature: 50) C.
  • a film forming apparatus equipped with a winder were used to produce an amorphous polyester resin film having a thickness of 100 ⁇ m.
  • the obtained amorphous polyester-based resin film was simultaneously biaxially stretched with a Bruckner stretching machine KAROIV to obtain a polyester film G (slow axis angle to length direction: -0.9°, in-plane phase Re (590): 3191 nm, thickness: 38 ⁇ m) were obtained.
  • the stretching ratio was 7 times in the length direction (MD) and 1 time in the width direction (TD) in the fixed end stretching.
  • the stretching temperature was 90° C., and the stretching speed was 10%/sec for both MD and TD. Further, after the stretching treatment, heat treatment was performed at 140° C. for 10 seconds while maintaining the dimensions.
  • Polyester film H (slow axis angle with respect to the length direction: 3) was produced in the same manner as in Production Example 8 except that the film-forming thickness was 50 ⁇ m and that stretching was not performed. 0.0°, in-plane phase Re(590): 17 nm, thickness: 50 ⁇ m) were obtained.
  • Example 1 Corona treatment is applied to the polyester film A produced in Production Example 2, and the product name "Superflex 210R” manufactured by Daiichi Kogyo Seiyaku Co., Ltd. is 15.2 wt% and the product name manufactured by Nippon Shokubai Co., Ltd. is "WS-700" 2.7 wt%. % Of the aqueous solution was dried to coat it to a film thickness of 300 ⁇ m, and dried at 80° C. for 1 minute to obtain a polyester film A with an easily adhesive layer.
  • a PVA-based resin aqueous solution manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "Gosefimer (registered trademark) Z-200", resin concentration: 3 wt%
  • the obtained laminate was heated in an oven maintained at 60°C for 5 minutes.
  • the substrate was peeled off from the PVA-based resin layer to obtain a polarizing plate (polarizer (transmittance 42.3%, thickness 5 ⁇ m)/protective film (polyester film)).
  • the polyester film A and the polarizer were laminated so that the MD direction of the polyester film A and the absorption axis direction of the polarizer were substantially parallel to each other.
  • the obtained polarizing plate was subjected to the above evaluations (1) to (6). The results are shown in Table 1.
  • Example 2 A polarizing plate was obtained in the same manner as in Example 1 except that the polyester film B produced in Production Example 3 was used instead of the polyester film A produced in Production Example 2. The obtained polarizing plate was subjected to the above evaluations (1) to (6). The results are shown in Table 1.
  • Example 3 A polarizing plate was obtained in the same manner as in Example 1 except that the polyester film C produced in Production Example 4 was used instead of the polyester film A produced in Production Example 2. The obtained polarizing plate was subjected to the above evaluations (1) to (6). The results are shown in Table 1.
  • Example 1 A polarizing plate was obtained in the same manner as in Example 1 except that the polyester film D produced in Production Example 5 was used instead of the polyester film A produced in Production Example 2. The obtained polarizing plate was subjected to the above evaluations (1) to (6). The results are shown in Table 1.
  • Polarizer 10 Polarizer 20 Polyester Film 30 Adhesive Layer 40 Easy Adhesive Layer 100, 200 Polarizing Plate

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Laminated Bodies (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Coating Of Shaped Articles Made Of Macromolecular Substances (AREA)

Abstract

L'invention fournit un film polyester qui présente un faible risque d'apparition d'irrégularités de type arc-en-ciel lors d'une application à un dispositif d'affichage d'image, et qui permet de contribuer à une amélioration de la durabilité d'une plaque polarisante.　Le film polyester de l'invention est tel qu'un coefficient de dilatation linéaire dans une seconde direction perpendiculaire à une première direction, est différent d'un coefficient de dilatation linéaire dans la première direction, le coefficient de dilatation linéaire dans la première direction est inférieur de １,０×１０－５／℃ ou plus au coefficient de dilatation linéaire dans la seconde direction, et le coefficient de dilatation linéaire dans la seconde direction est inférieur ou égal à ７,５×１０－５／℃, et présente un axe lent dans une direction de －５° à ５° vis-à-vis de la première direction.
PCT/JP2019/044776 2019-01-31 2019-11-14 Film polyester, et plaque polarisante contenant celui-ci WO2020158112A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2020569392A JPWO2020158112A1 (ja) 2019-01-31 2019-11-14 ポリエステルフィルム、および該ポリエステルフィルムを含む偏光板
KR1020217023474A KR20210119986A (ko) 2019-01-31 2019-11-14 폴리에스테르 필름 및 그 폴리에스테르 필름을 포함하는 편광판
CN201980090909.1A CN113366354A (zh) 2019-01-31 2019-11-14 聚酯薄膜、及包含该聚酯薄膜的偏光板
JP2023129043A JP2023159193A (ja) 2019-01-31 2023-08-08 ポリエステルフィルム、および該ポリエステルフィルムを含む偏光板

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-016236 2019-01-31
JP2019016236 2019-01-31

Publications (1)

Publication Number Publication Date
WO2020158112A1 true WO2020158112A1 (fr) 2020-08-06

Family

ID=71840410

Family Applications (3)

Application Number Title Priority Date Filing Date
PCT/JP2019/044778 WO2020158114A1 (fr) 2019-01-31 2019-11-14 Film de polyester et plaque de polarisation comprenant le film de polyester
PCT/JP2019/044777 WO2020158113A1 (fr) 2019-01-31 2019-11-14 Film de polyester et plaque de polarisation comprenant le film de polyester
PCT/JP2019/044776 WO2020158112A1 (fr) 2019-01-31 2019-11-14 Film polyester, et plaque polarisante contenant celui-ci

Family Applications Before (2)

Application Number Title Priority Date Filing Date
PCT/JP2019/044778 WO2020158114A1 (fr) 2019-01-31 2019-11-14 Film de polyester et plaque de polarisation comprenant le film de polyester
PCT/JP2019/044777 WO2020158113A1 (fr) 2019-01-31 2019-11-14 Film de polyester et plaque de polarisation comprenant le film de polyester

Country Status (5)

Country Link
JP (6) JPWO2020158112A1 (fr)
KR (3) KR20210121033A (fr)
CN (3) CN113474689A (fr)
TW (2) TWI828805B (fr)
WO (3) WO2020158114A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230163350A (ko) 2021-03-31 2023-11-30 닛토덴코 가부시키가이샤 편광자 보호용 폴리에스테르 필름, 및 그것을 사용한편광판

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012018315A (ja) * 2010-07-08 2012-01-26 Nippon Shokubai Co Ltd 光学フィルム、偏光板および画像表示装置
JP2015136922A (ja) * 2014-01-24 2015-07-30 帝人デュポンフィルム株式会社 ポリエステルフィルム
JP2018002756A (ja) * 2016-06-27 2018-01-11 日東電工株式会社 光学用粘着シート、粘着剤層付偏光フィルム、および液晶表示装置
JP2018059078A (ja) * 2016-09-30 2018-04-12 東レ株式会社 ポリエステルフィルムおよびそれを用いた表示装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08271733A (ja) 1995-04-03 1996-10-18 Fujimori Kogyo Kk 前面側偏光板の前面側保護シート、その製造法、および該前面側保護シートの偏光素膜側への貼着方法
JP2004226799A (ja) * 2003-01-24 2004-08-12 Konica Minolta Holdings Inc 偏光板保護フィルム、偏光板及び画像表示用材料
JP2008107501A (ja) * 2006-10-24 2008-05-08 Fujifilm Corp 偏光板、及び液晶表示装置
JP5764332B2 (ja) * 2011-01-07 2015-08-19 日東電工株式会社 偏光板
JP2012247574A (ja) * 2011-05-26 2012-12-13 Nitto Denko Corp 粘着型偏光板および画像表示装置
JP6111551B2 (ja) * 2012-08-02 2017-04-12 東洋紡株式会社 液晶表示装置、偏光板及び偏光子保護フィルム
WO2014115770A1 (fr) * 2013-01-24 2014-07-31 住友金属鉱山株式会社 Substrat électroconducteur transparent et son procédé de production
JP5990128B2 (ja) * 2013-05-01 2016-09-07 富士フイルム株式会社 液晶表示装置
JP2016001305A (ja) * 2014-05-23 2016-01-07 東レ株式会社 光学用ポリエステルフィルム及びそれを用いた偏光板、透明導電性フィルム
JP6741477B2 (ja) * 2016-05-23 2020-08-19 日東電工株式会社 偏光フィルム、粘着剤層付き偏光フィルム、及び画像表示装置
WO2018181653A1 (fr) * 2017-03-31 2018-10-04 東洋紡株式会社 Film de protection polarisant, plaque polarisante et dispositif d'affichage d'image

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012018315A (ja) * 2010-07-08 2012-01-26 Nippon Shokubai Co Ltd 光学フィルム、偏光板および画像表示装置
JP2015136922A (ja) * 2014-01-24 2015-07-30 帝人デュポンフィルム株式会社 ポリエステルフィルム
JP2018002756A (ja) * 2016-06-27 2018-01-11 日東電工株式会社 光学用粘着シート、粘着剤層付偏光フィルム、および液晶表示装置
JP2018059078A (ja) * 2016-09-30 2018-04-12 東レ株式会社 ポリエステルフィルムおよびそれを用いた表示装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230163350A (ko) 2021-03-31 2023-11-30 닛토덴코 가부시키가이샤 편광자 보호용 폴리에스테르 필름, 및 그것을 사용한편광판

Also Published As

Publication number Publication date
WO2020158114A1 (fr) 2020-08-06
KR20210121033A (ko) 2021-10-07
TWI828805B (zh) 2024-01-11
TW202039652A (zh) 2020-11-01
CN113474689A (zh) 2021-10-01
JPWO2020158113A1 (ja) 2021-10-21
JP2023159195A (ja) 2023-10-31
TW202030239A (zh) 2020-08-16
JP2023159193A (ja) 2023-10-31
CN113366353A (zh) 2021-09-07
KR20210119986A (ko) 2021-10-06
TW202030240A (zh) 2020-08-16
WO2020158113A1 (fr) 2020-08-06
TWI822910B (zh) 2023-11-21
JP2023159194A (ja) 2023-10-31
CN113366354A (zh) 2021-09-07
KR20210121034A (ko) 2021-10-07
JPWO2020158112A1 (ja) 2021-10-21
JPWO2020158114A1 (ja) 2021-10-21

Similar Documents

Publication Publication Date Title
JP2024009095A (ja) ポリエステルフィルム、および該ポリエステルフィルムを含む偏光板
JP2023159195A (ja) ポリエステルフィルム、および該ポリエステルフィルムを含む偏光板
JP7154188B2 (ja) ポリエステルフィルム、および該ポリエステルフィルムを含む偏光板
WO2020158084A1 (fr) Film de polyester et plaque de polarisation comprenant le film de polyester
TWI846761B (zh) 聚酯薄膜及包含該聚酯薄膜之偏光板
WO2022024493A1 (fr) Film de polyester pour protéger un polariseur et plaque de polarisation comprenant ledit film de polyester
WO2022024492A1 (fr) Film de polyester pour la protection de polariseur et plaque de polarisation comprenant ledit film de polyester
WO2022024494A1 (fr) Film polyester de protection de polariseur et lame polarisante comprenant le film polyester
WO2022210249A1 (fr) Film de polyester pour la protection de polariseur, et plaque de polarisation l'utilisant

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: 19913698

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2020569392

Country of ref document: JP

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: 19913698

Country of ref document: EP

Kind code of ref document: A1