CN116097137A - Polarizing plate and image display device using same - Google Patents

Polarizing plate and image display device using same Download PDF

Info

Publication number
CN116097137A
CN116097137A CN202180057603.3A CN202180057603A CN116097137A CN 116097137 A CN116097137 A CN 116097137A CN 202180057603 A CN202180057603 A CN 202180057603A CN 116097137 A CN116097137 A CN 116097137A
Authority
CN
China
Prior art keywords
polarizing plate
base polymer
meth
resistance value
adhesive 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.)
Pending
Application number
CN202180057603.3A
Other languages
Chinese (zh)
Inventor
藤田雅人
木村智之
杉山翔平
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.)
Nitto Denko Corp
Original Assignee
Nitto Denko Corp
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
Priority claimed from JP2020184803A external-priority patent/JP2022074622A/en
Priority claimed from JP2021028858A external-priority patent/JP2022129959A/en
Application filed by Nitto Denko Corp filed Critical Nitto Denko Corp
Publication of CN116097137A publication Critical patent/CN116097137A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/06—Non-macromolecular additives organic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on 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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J201/00—Adhesives based on unspecified macromolecular compounds
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Polarising Elements (AREA)

Abstract

The invention provides a polarizing plate which has excellent durability and is suppressed in cracking during special-shaped processing despite having a low-resistance adhesive layer. The polarizing plate of an embodiment of the present invention comprises an adhesive layer having a special shape, wherein the adhesive composition constituting the adhesive layer comprises a base polymer having a glass transition temperature of-50 ℃ or lower and a dielectric constant of 5.0 or higher at 100kHz, and an antistatic agent, and the adhesive layer has a surface resistance value of 1.0X10 9 Ω/≡or less.

Description

Polarizing plate and image display device using same
Technical Field
The present invention relates to a polarizing plate and an image display device using the same.
Background
Image display devices, such as liquid crystal display devices and Electroluminescent (EL) display devices (for example, organic EL display devices and inorganic EL display devices), are rapidly spreading. In an image display device, typically, a polarizing plate is bonded to a display panel via an adhesive layer. In recent years, with the development of a so-called in-line type image display device in which a touch panel conductive layer is introduced into a display panel, and the like, improvement of antistatic performance of the image display device has been demanded. As a result, improvement in antistatic performance and reduction in resistance of the adhesive layer are demanded. However, in the polarizing plate using such an adhesive layer, there are problems such as a decrease in durability of the polarizing plate due to a large amount of antistatic agent added, and occurrence of cracks when the polarizing plate is processed into a special shape other than a rectangular shape. In addition, the adhesive layer is required to have stable antistatic function in heating and humidification tests.
Prior art literature
Patent literature
Patent document 1: japanese patent application laid-open No. 2015-193371
Disclosure of Invention
Problems to be solved by the invention
The present invention has been made to solve the above-described conventional problems, and a main object of the present invention is to provide a polarizing plate which has excellent durability and suppressed cracking during a special-shaped process, in spite of having a low-resistance adhesive layer.
Means for solving the problems
The polarizing plate of an embodiment of the present invention comprises an adhesive layer having a special shape, wherein the adhesive composition constituting the adhesive layer comprises a base polymer having a glass transition temperature of-50 ℃ or lower and a dielectric constant of 5.0 or higher at 100kHz, and an antistatic agent, and the adhesive layer has a surface resistance value of 1.0X10 9 Ω/≡or less.
In one embodiment, the base polymer contains an alkoxy group-containing monomer as a monomer component.
In one embodiment, the base polymer includes 30 to 99 parts by weight of the alkoxy group-containing monomer with respect to 100 parts by weight of the entire monomer components.
In one embodiment, the above alkoxy group-containing monomer is represented by the following formula.
[ chemical formula 1]
Figure BDA0004113475970000021
Wherein R is 1 Is alkyl, n is an integer of 1 to 15.
In one embodiment, the base polymer further comprises a hydroxyl group-containing monomer as a monomer component.
In one embodiment, the antistatic agent is contained in the adhesive composition in an amount of less than 10 parts by weight relative to 100 parts by weight of the base polymer.
In one embodiment, the antistatic agent comprises lithium bis (trifluoromethanesulfonyl) imide, 1-ethyl-3-methylimidazole bis (fluorosulfonyl) imide salt, or tributyl methylammonium bis (trifluoromethanesulfonyl) imide.
In one embodiment, the adhesive composition further comprises a silane coupling agent.
In one embodiment, the adhesive composition further comprises an antioxidant.
In one embodiment, the adhesive layer has an adhesive force to glass of 1.0N/25mm or more.
In one embodiment, the polarizing plate has a resistance value increase rate of 10 or less in a heating test represented by the following formula.
Resistance value increase rate=resistance value after reliability test/initial resistance value
Wherein the heating test is performed at a temperature of 85 ℃ for 500 hours.
In one embodiment, the rate of increase in resistance in the humidification test of the polarizer represented by the following formula is 10 or less.
Resistance value increase rate=resistance value after reliability test/initial resistance value
Wherein the humidification test was performed at a temperature of 60℃and a humidity of 95% RH for 500 hours.
According to other aspects of the present invention, there is provided an image display apparatus. The image display device includes the polarizing plate.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the embodiment of the present invention, by setting the pressure-sensitive adhesive layer to a specific configuration in the polarizing plate having the low-resistance pressure-sensitive adhesive layer, the polarizing plate excellent in durability and suppressed in cracking during the special-shaped processing can be realized.
Drawings
Fig. 1 is a schematic cross-sectional view of a polarizing plate according to an embodiment of the present invention.
Fig. 2 is a schematic plan view illustrating an example of a deformed portion or a deformed portion in the polarizing plate according to the embodiment of the present invention.
Fig. 3 is a schematic plan view illustrating an example of a deformed portion or a deformed portion in the polarizing plate according to the embodiment of the present invention.
Fig. 4 is a schematic plan view illustrating an example of a deformed portion or a deformed portion in the polarizing plate according to the embodiment of the present invention.
Fig. 5 is a schematic plan view illustrating an example of a deformed portion or a deformed portion in the polarizing plate according to the embodiment of the present invention.
Symbol description
11. Polarizer
12. Protective layer
13. Protective layer
20. Adhesive layer
100. Polarizing plate
Detailed Description
Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to these embodiments.
A. Integral construction of polarizer
The polarizing plate of the present invention comprises an adhesive layer. Fig. 1 is a schematic cross-sectional view of a polarizing plate according to an embodiment of the present invention. Typically, the polarizing plate 100 has: the polarizer 11, the protective layer 12 provided on one side of the polarizer 11, the protective layer 13 provided on the other side of the polarizer 11, and the adhesive layer 20 provided on the side of the protective layer 13 opposite to the polarizer 11. At least one of the protective layer 12 and the protective layer 13 may be omitted according to the purpose. The adhesive layer 20 is provided as an outermost layer, and a polarizing plate may be attached to an image display device (substantially an image display panel). In practical use, it is preferable to temporarily adhere a release film to the surface of the adhesive layer 20 until the polarizing plate is used. By temporarily attaching the release film, the adhesive layer can be protected, and a roll of the polarizing plate can be formed.
In an embodiment of the present invention, an adhesive composition constituting an adhesive layer includes a base polymer and an antistatic agent. The base polymer has a glass transition temperature of-50 ℃ or lower and a dielectric constant of 5.0 or higher at 100 kHz. By using such a base polymer, an adhesive layer having a small surface resistance value can be realized even if the content of the antistatic agent is small. That is, in the embodiment of the present invention, although the content of the antistatic agent in the adhesive composition is less than 10 parts by weight relative to 100 parts by weight of the base polymer, the surface resistance value of the adhesive layer can be made to be 1.0X10 9 Ω/≡or less. As a result, a polarizing plate excellent in durability and suppressed in cracking during the special-shaped processing can be realized.
In an embodiment of the present invention, the rate of increase in resistance value by the heating test, which is represented by the following formula of the polarizing plate, is preferably 10 or less, more preferably 8 or less, and further preferably 5 or less.
Resistance value increase rate=resistance value after reliability test/initial resistance value
Wherein the heating test is performed at a temperature of 85 ℃ for 500 hours.
In the embodiment of the present invention, the resistance value increase rate in the humidification test represented by the following formula of the polarizing plate is 10 or less, more preferably 8 or less, and still more preferably 5 or less.
Resistance value increase rate=resistance value after reliability test/initial resistance value
Wherein the humidification test was performed at a temperature of 60℃and a humidity of 95% RH for 500 hours.
In the polarizing plate according to the embodiment of the present invention, by setting the rate of increase in the resistance value of the polarizing plate in such a range, a polarizing plate excellent in durability and suppressed in cracking during the irregular processing can be realized.
The polarizing plate of the embodiment of the present invention may further include other functional layers. As a representative example of such a functional layer, a retardation layer can be given. The optical characteristics (for example, refractive index characteristics, in-plane retardation, nz coefficient, photoelastic coefficient), thickness, arrangement position, and the like of the retardation layer can be appropriately set according to the purpose.
The polarizing plate according to the embodiment of the present invention may be in the form of a sheet or a long sheet. In the present specification, "elongated" means an elongated shape having a length sufficiently long with respect to a width, and includes, for example, an elongated shape having a length of 10 times or more, preferably 20 times or more, with respect to a width. The elongated polarizer may be wound into a roll.
The polarizing plate according to the embodiment of the present invention has a special shape other than a rectangle. In the present specification, "having a special shape other than a rectangle" means that the polarizing plate has a shape other than a rectangle in plan view. The profile is preferably a profile-processed portion subjected to profile processing. Accordingly, the term "polarizing plate having a special shape other than a rectangle" includes not only the case where the entire polarizing plate (i.e., the outer edge that determines the planar shape of the film) is a rectangle but also the case where a special-shaped processed portion is formed at a portion spaced inward from the outer edge of the rectangular polarizing plate. In the case of using an adhesive layer having a small surface resistance value (low-resistance adhesive layer), the added antistatic agent functions as a plasticizer, and in such a deformed portion, since the polarizing plate shrinks in a high-temperature environment, cracks are likely to occur in the polarizing plate, but according to the embodiment of the present invention, such cracks can be significantly suppressed. As the special-shape (special-shaped processing portion), for example, as shown in fig. 2 and 3, there may be mentioned: through holes, chamfer of corners, and cutting portions to become concave portions in plan view. Typical examples of the concave portion include a shape similar to a boat, a shape similar to a bathtub, a V-shaped notch, and a U-shaped notch. As another example of the special shape (special-shaped portion), as shown in fig. 4 and 5, a shape corresponding to an instrument panel of an automobile is given. In this shape, the outer edge is formed in an arc shape along the rotation direction of the meter needle, and includes a portion in which the outer edge has a V-shape (including an arc shape) protruding inward in the plane direction. The shape of the profile is not limited to the above example, and any appropriate shape according to the purpose may be adopted. For example, as the shape of the through hole, a circle, an ellipse, a triangle, a quadrangle, a pentagon, a hexagon, an octagon may be used. In addition, the through holes may be provided at any appropriate positions according to purposes. The through hole may be provided at a substantially central portion of the longitudinal end portion of the rectangular polarizing plate, may be provided at a predetermined position of the longitudinal end portion, or may be provided at a corner portion of the polarizing plate; may be provided at the short-side end of the rectangular polarizing plate; the polarizing plate may be provided in a central portion of the polarizing plate having a shape of a special shape as a whole. The profiled portion may be formed by combining the above examples. For example, the through holes may be formed in combination with V-notches and/or U-notches.
Hereinafter, the constituent elements of the polarizing plate will be described in more detail.
B. Polarizer
Typically, the polarizer is formed of a resin film containing a dichroic substance (typically iodine). Any suitable resin film that can be used as a polarizer can be used as the resin film. Typically, the resin film is a polyvinyl alcohol resin (hereinafter referred to as "PVA-based resin") film. The resin film may be a single-layer resin film or a laminate of two or more layers.
A specific example of a polarizer composed of a single-layer resin film is a polarizer obtained by subjecting a PVA-based resin film to a dyeing treatment with iodine and a stretching treatment (typically, unidirectional stretching). The dyeing with iodine can be performed, for example, by immersing the PVA-based film in an aqueous iodine solution. The stretching ratio of the unidirectional stretching is preferably 3 to 7 times. Stretching may be performed after dyeing treatment or may be performed while dyeing. In addition, dyeing may be performed after stretching. The PVA-based resin film may be subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment, and the like as needed. For example, by immersing the PVA-based resin film in water before dyeing and washing with water, not only dirt and an anti-blocking agent on the surface of the PVA-based film can be washed off, but also the PVA-based resin film can be swelled to prevent uneven dyeing and the like.
Specific examples of the polarizer obtained by using the laminate include: a polarizer obtained by using a laminate of a resin base material and a PVA-based resin layer (PVA-based resin film) laminated on the resin base material, or by using a laminate of a resin base material and a PVA-based resin layer formed on the resin base material by coating. A polarizer obtained by using a laminate of a resin base material and a PVA-based resin layer formed on the resin base material, can be produced by the following method: for example, a PVA-based resin solution is applied to a resin substrate, and dried to form a PVA-based resin layer on the resin substrate, thereby obtaining a laminate of the resin substrate and the PVA-based resin layer; the laminate was stretched and dyed to prepare a polarizer from the PVA-based resin layer. In the present embodiment, it is preferable to form a polyvinyl alcohol resin layer containing a halide and a polyvinyl alcohol resin on one side of the resin base material. Stretching typically includes immersing the laminate in an aqueous boric acid solution to stretch the laminate. Further, the stretching may further include stretching the laminate in a gas atmosphere at a high temperature (for example, 95 ℃ or higher) before stretching in an aqueous boric acid solution, as needed. In the present embodiment, it is preferable that the laminate is subjected to a drying shrinkage treatment in which the laminate is heated while being conveyed in the longitudinal direction and is shrunk by 2% or more in the width direction. Typically, the manufacturing method of the present embodiment includes sequentially subjecting the laminate to an auxiliary stretching treatment in a gas atmosphere, a dyeing treatment, an aqueous stretching treatment, and a drying shrinkage treatment. By introducing the auxiliary stretching, even when PVA is coated on the thermoplastic resin, crystallinity of PVA can be improved, and high optical characteristics can be achieved. Further, by simultaneously improving the orientation of PVA in advance, problems such as lowering and dissolution of the orientation of PVA can be prevented when immersed in water in the subsequent dyeing step and stretching step, and high optical characteristics can be achieved. In addition, when the PVA-based resin layer is immersed in a liquid, disorder of alignment and decrease of alignment property of the polyvinyl alcohol molecules can be suppressed as compared with the case where the PVA-based resin layer does not contain a halide. This can improve the optical characteristics of the polarizer obtained by the treatment step of immersing the laminate in a liquid, such as dyeing treatment or stretching treatment in an aqueous solution. Further, the optical characteristics can be improved by shrinking the laminate in the width direction by the drying shrinkage treatment. The resulting laminate of the resin substrate and the polarizer may be used as it is (that is, the resin substrate may be used as a protective layer for the polarizer), or the resin substrate may be peeled off from the laminate of the resin substrate and the polarizer, and any appropriate protective layer suitable for the purpose may be laminated on the peeled surface. Details of such a method for manufacturing a polarizer are described in, for example, japanese patent application laid-open nos. 2012-73580 (5414738) and 6470455. The entire disclosures of these publications are incorporated by reference into this specification.
The thickness of the polarizer is preferably 1 μm to 15 μm, more preferably 1 μm to 10 μm, still more preferably 1 μm to 8 μm, particularly preferably 2 μm to 5 μm.
The polarizer preferably exhibits absorption dichroism at any of wavelengths 380nm to 780 nm. The transmittance of the polarizer is preferably 41.5% to 46.0%, more preferably 43.0% to 46.0%, and still more preferably 44.5% to 46.0%. The polarization degree of the polarizer is preferably 97.0% or more, more preferably 99.0% or more, and still more preferably 99.9% or more.
C. Protective layer
The protective layers 12 and 13 may be formed of any appropriate film that can be used as a protective layer of a polarizer. Specific examples of the material that becomes the main component of the film include: cellulose resins such as cellulose Triacetate (TAC), transparent resins such as polyesters, polyvinyl alcohols, polycarbonates, polyamides, polyimides, polyethersulfones, polysulfones, polystyrenes, polynorbornenes, polyolefins, (meth) acrylic acids, and acetates, and the like. In addition, there may be mentioned: and (meth) acrylic, urethane, (meth) acrylic urethane, epoxy, silicone, and other thermosetting resins or ultraviolet curable resins. In addition, glass polymers such as siloxane polymers can be used. In addition, a polymer film described in Japanese patent application laid-open No. 2001-343529 (WO 01/37007) can be used. As a material of the film, for example, a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in a side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and a nitrile group in a side chain can be used, and examples thereof include: a resin composition having an alternating copolymer of isobutylene and N-methylmaleimide and an acrylonitrile-styrene copolymer. The polymer film may be, for example, an extrusion molded product of the above resin composition.
When the polarizing plate is disposed on the visible side of the image display device, the protective layer 12 is typically disposed on the visible side. In this case, the protective layer 12 may be subjected to surface treatments such as hard coat treatment, antireflection treatment, anti-sticking treatment, and antiglare treatment, as necessary.
The thickness of the protective layer is preferably 10 μm to 50 μm, more preferably 15 μm to 35 μm. In the case of performing the surface treatment, the thickness of the outer protective layer is a thickness including the thickness of the surface treatment layer.
D. Adhesive layer
As described above, the adhesive layer 20 had a surface resistance value of 1.0X10 9 Omega/≡or less, preferably 9.0X10 8 Omega/≡or less, more preferably 8.0X10 8 Omega/≡or less, more preferably 7.0X10 8 Omega/≡or less, particularly preferably 6.0X10 8 Ω/≡or less. The lower limit of the surface resistance value may be, for example, 5.0X10 5 Ω/≡. As described above, according to the embodiment of the present invention, an adhesive layer having a small surface resistance value can be realized despite the small content of the antistatic agent.
The adhesive force of the adhesive layer to glass is preferably 1.0N/25mm or more, more preferably 1.5N/25mm or more, and still more preferably 2.0N/25mm or more. If the adhesive force is in such a range, the adhesion to the image display panel is excellent and the reworkability is excellent. The upper limit of the adhesive force may be, for example, 6.0N/25mm.
The thickness of the pressure-sensitive adhesive layer is preferably 2 μm to 55 μm, more preferably 2 μm to 30 μm, still more preferably 5 μm to 25 μm, particularly preferably 10 μm to 20 μm.
As described above, the adhesive composition constituting the adhesive layer includes the base polymer and the antistatic agent. As described above, the glass transition temperature (Tg) of the base polymer is-50℃or lower, preferably-52℃or lower, more preferably-55℃or lower. The lower limit of Tg of the base polymer may be, for example, -75 ℃. As described above, the dielectric constant of the base polymer at 100kHz is 5.0 or more, preferably 5.5 or more, more preferably 6.0 or more, still more preferably 6.5 or more, and particularly preferably 7.0 or more. The upper limit of the dielectric constant of the base polymer may be, for example, 10.0. By using such a base polymer, an adhesive layer having a small surface resistance value can be realized despite a small content of the antistatic agent. The Tg of the base polymer may be calculated as the Tg of a polymer obtained by converting the Tg of each monomer component using a polymerization ratio.
Examples of the base polymer include: the (meth) acrylic polymer, the urethane polymer, the silicone polymer, and the rubber polymer are preferably (meth) acrylic polymers. In the present specification, the (meth) acrylic polymer as the base polymer is sometimes referred to as a (meth) acrylic base polymer.
The (meth) acrylic base polymer preferably contains an alkoxy group-containing monomer as a monomer component, and examples of the alkoxy group-containing monomer include monomers represented by the following formula.
[ chemical formula 2]
Figure BDA0004113475970000081
Wherein R is 1 Alkyl is, for example, methyl or ethyl, and n is an integer from 1 to 15. As apparent from the above formula, the alkoxy group is preferably linear. In the case of the linear alkoxy group, tg of the resulting (meth) acrylic base polymer can be set to the above desired range, and the dielectric constant of the base polymer can be set to the above desired range. The base polymer containing a monomer having a ring structure may have a Tg too high and/or a dielectric constant too small. Specific examples of the alkoxy group-containing monomer include: methoxyethyl (meth) acrylate, ethoxyethoxyethyl (meth) acrylate, methoxytriethylene glycol (meth) acrylate, and methoxypolyethylene glycol (meth) acrylate. These alkoxy group-containing monomers may be used alone or in combination of 2 or more. By using an alkoxy group-containing monomer as a monomer component, a base polymer having a desired Tg and dielectric constant can be obtained. As a result, an adhesive layer having a small surface resistance value can be realized, although the content of the antistatic agent is small. The content of the alkoxy group-containing monomer in the base polymer is preferably 30 to 99 parts by weight based on 100 parts by weight of the entire monomer components. The content of the alkoxy group-containing monomer may be, for example, 30 to 60 parts by weight, and may be, for example, 30 to 50 parts by weight, and may be, for example, 50 to 99 parts by weight, and may be, for example, 60 to 99 parts by weight.
The (meth) acrylic base polymer preferably contains a hydroxyl group-containing monomer as a monomer component. Examples of the hydroxyl group-containing monomer include: 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 8-hydroxyoctyl (meth) acrylate, 10-hydroxydecyl (meth) acrylate, 12-hydroxylauryl (meth) acrylate, 4-hydroxymethylcyclohexyl) methyl acrylate. From the viewpoint of improving the durability of the adhesive layer, 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate is preferable, and 4-hydroxybutyl (meth) acrylate is more preferable. The content of the hydroxyl group-containing monomer in the base polymer is preferably 1 to 5 parts by weight, more preferably 1 to 3 parts by weight, relative to 100 parts by weight of the entire monomer components.
The (meth) acrylic base polymer may contain an alkyl (meth) acrylate as a monomer component. Examples of the alkyl (meth) acrylate include linear or branched alkyl (meth) acrylates having an alkyl group having 1 to 18 carbon atoms. As the alkyl group, for example, there may be exemplified: methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl, hexyl, cyclohexyl, heptyl, 2-ethylhexyl, isooctyl, nonyl, decyl, isodecyl, dodecyl, isotetradecyl, lauryl, tridecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, and the like. The alkyl (meth) acrylates may be used alone or in combination. The average number of carbon atoms of the alkyl group is preferably 3 to 8, more preferably 3 to 6. The content of the alkyl (meth) acrylate in the base polymer may be arbitrarily set as the remainder of the monomer component other than the alkyl (meth) acrylate.
The (meth) acrylic base polymer may further contain other monomer components (comonomers) as needed. Typical examples of the comonomer include aromatic hydrocarbon group-containing monomers (e.g., phenyl (meth) acrylate, phenoxyethyl (meth) acrylate, benzyl (meth) acrylate, carboxyl group-containing monomers (e.g., carboxyethyl (meth) acrylate, carboxypentyl (meth) acrylate, itaconic acid, maleic acid, fumaric acid, butenoic acid), amino group-containing monomers (e.g., N-dimethylaminoethyl (meth) acrylate), amide group-containing monomers (e.g., acrylamide, N-dimethyl (meth) acrylamide, N-diethyl (meth) acrylamide), nitrile group-containing monomers (e.g., acrylonitrile), polyfunctional monomers (e.g., hexanediol di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate), epoxy group-containing monomers (e.g., glycidyl (meth) acrylate), and heterocyclic group-containing monomers (e.g., acryloylmorpholine). The kind, amount, combination, and blending amount (content) of the comonomer can be appropriately set according to the purpose.
The weight average molecular weight Mw of the (meth) acrylic base polymer is preferably 100 to 300,000,000, more preferably 200 to 300,000, and still more preferably 200 to 280,000. When the weight average molecular weight Mw is less than 100 ten thousand, the inhibition of cracks may become insufficient, and when the weight average molecular weight Mw exceeds 300 ten thousand, the viscosity may be increased and/or gelation may occur during the polymerization of the polymer.
As the antistatic agent, inorganic cation salts and organic cation salts are typically mentioned.
The inorganic cation salt is specifically an inorganic cation-anion salt. As the cations constituting the cation portion of the inorganic cation salt, alkali metal ions are typically exemplified. Specific examples thereof include lithium ion, sodium ion, and potassium ion. Lithium ions are preferred. Thus, the preferred inorganic cation salt is a lithium salt.
Examples of anions constituting the anion portion of the inorganic cation salt include: cl - 、Br - 、I - 、AlCl 4 - 、Al 2 Cl 7 - 、BF 4 - 、PF 6 - 、ClO 4 - 、NO 3 - 、CH 3 COO - 、CF 3 COO - 、CH 3 SO 3 - 、CF 3 SO 3 - 、(CF 3 SO 2 ) 3 C - 、AsF 6 - 、SbF 6 - 、NbF 6 - 、TaF 6 - 、(CN) 2 N - 、C 4 F 9 SO 3 - 、C 3 F 7 COO - 、(CF 3 SO 2 )(CF 3 CO)N - 、 - O 3 S(CF 2 ) 3 SO 3 - And anions represented by the following general formulae (1) to (4).
(1)：(C n F 2n+1 SO 2 ) 2 N - (n is an integer of 1 to 10),
(2)：CF 2 (C m F 2m SO 2 ) 2 N - (m is an integer of 1 to 10),
(3)： - O 3 S(CF 2 ) l SO 3 - (l is an integer of 1 to 10),
(4)：(C p F 2p+1 SO 2 )N - (C q F 2q+1 SO 2 ) (p and q are integers of 1 to 10).
Preferably a fluorine-containing anion, more preferably a fluorine-containing imide anion.
Examples of the fluorine-containing imide anion include imide anions having perfluoroalkyl groups. Specific examples thereof include the above (CF 3 SO 2 )(CF 3 CO)N - And anions represented by the general formulae (1), (2) and (4).
(1)：(C n F 2n+1 SO 2 ) 2 N - (n is an integer of 1 to 10),
(2)：CF 2 (C m F 2m SO 2 ) 2 N - (m is an integer of 1 to 10),
(4)：(C p F 2p+1 SO 2 )N - (C q F 2q+1 SO 2 ) (p and q are integers of 1 to 10).
Preferably (CF) 3 SO 2 ) 2 N - 、(C 2 F 5 SO 2 ) 2 N - (perfluoroalkyl sulfonyl) imide represented by the general formula (1), more preferably (CF) 3 SO 2 ) 2 N - Indicated bis (trifluoromethanesulfonyl) imide. Thus, a preferred inorganic cationic salt that can be used in embodiments of the present invention is lithium bistrifluoromethane sulfonyl imide.
The organic cation salt is specifically an organic cation-anion salt. As the cations constituting the cation portion of the organic cation salt, typically, there are given: formed by substitution with organic groups
Figure BDA0004113475970000111
Organic onium ion>
Figure BDA0004113475970000112
And (3) salt. As an organic->
Figure BDA0004113475970000113
In salt>
Figure BDA0004113475970000114
Examples of the salt include: nitrogen-containing->
Figure BDA0004113475970000115
Salt, sulfur->
Figure BDA0004113475970000116
Salt, phosphorus->
Figure BDA0004113475970000117
And (3) salt. Preferably nitrogen +.>
Figure BDA0004113475970000118
Salt, sulfur->
Figure BDA0004113475970000119
And (3) salt. As nitrogen +.>
Figure BDA00041134759700001110
Salts, for example ammonium cations, piperidine->
Figure BDA00041134759700001111
Cation, pyrrolidine->
Figure BDA00041134759700001112
Cation, pyridine->
Figure BDA00041134759700001113
Cations, cations having a pyrroline skeleton, imidazole +.>
Figure BDA00041134759700001114
Cationic, tetrahydropyrimidine->
Figure BDA00041134759700001115
Cationic, dihydropyrimidine->
Figure BDA00041134759700001116
Cation, pyrazole->
Figure BDA00041134759700001117
Cationic, pyrazoline->
Figure BDA00041134759700001118
And (3) cations. As sulfur- >
Figure BDA00041134759700001119
Examples of the salt include sulfonium cations. As phosphorus-containing->
Figure BDA00041134759700001120
Salts, for example, include->
Figure BDA00041134759700001121
And (3) cations. As an organic->
Figure BDA00041134759700001122
Examples of the organic group in the salt include: alkyl, alkoxy, alkenyl. As a preferred organic->
Figure BDA00041134759700001123
Specific examples of salts include tetraalkylammonium cations (e.g., tributyl methylammonium cation), alkylpiperidines +.>
Figure BDA00041134759700001124
Cationic, alkylpyrrolidino->
Figure BDA00041134759700001125
And (3) cations. Anions constituting the anionic part of the organic cation salt, e.g. for anions constituting the anionic part of the inorganic cationAs described. Preferred organic cation salts that can be used in embodiments of the present invention are 1-ethyl-3-methylimidazole bis (fluorosulfonyl) imide salt, tributyl methylammonium bis (trifluoromethanesulfonyl) imide.
Inorganic cationic salts may be used in combination with organic cationic salts.
The content of the antistatic agent in the adhesive composition is, as described above, less than 10 parts by weight, preferably 7 parts by weight or less, more preferably 5 parts by weight or less, and still more preferably 3 parts by weight or less, relative to 100 parts by weight of the base polymer. According to the embodiment of the present invention, although the content of the antistatic agent is so small, an adhesive layer having a small surface resistance value can be realized. The lower limit of the content of the antistatic agent may be, for example, 0.5 parts by weight. When the content of the antistatic agent is too small, a desired surface resistance value may not be obtained.
The adhesive composition typically contains a silane coupling agent, a crosslinking agent, and/or an antioxidant. As the silane coupling agent, a functional group-containing silane coupling agent is typically exemplified. Examples of the functional group include: epoxy, mercapto, amino, isocyanate, isocyanurate, vinyl, styryl, acetoacetyl, ureido, thiourea, (meth) acrylic, heterocyclic, anhydride groups, and combinations thereof. The functional group-containing silane coupling agents may be used alone or in combination. Examples of the crosslinking agent include isocyanate-based crosslinking agents and peroxide-based crosslinking agents. In addition, the crosslinking agents may be used alone or in combination. By containing the silane coupling agent, the following advantages can be obtained. Since the polarity of the adhesive composition using the base polymer containing the alkoxy group-containing monomer becomes high, there is a case where the adhesiveness to the non-polar adherend becomes insufficient. By containing the silane coupling agent, sufficient adhesion to various adherends can be obtained, and peeling can be suppressed. In addition, by containing an antioxidant, the following advantages can be obtained. The Tg of the base polymer containing the alkoxy group-containing monomer becomes low and becomes soft. By containing the antioxidant, shrinkage due to oxidative deterioration from the polarizer end face and the adhesive layer end face can be suppressed.
The adhesive composition may contain additives. Specific examples of the additive include: powder such as colorant, pigment, dye, surfactant, plasticizer, tackifier, surface lubricant, leveling agent, softener, anti-aging agent, light stabilizer, ultraviolet absorber, polymerization inhibitor, inorganic or organic filler, metal powder, particulate and foil. In addition, redox systems incorporating reducing agents may also be employed within controlled limits. The kind, amount, combination, content, and the like of the additives may be appropriately set according to the purpose.
E. Image display device
The polarizing plate described in the above item A to D can be applied to an image display device. Accordingly, embodiments of the present invention include an image display device using such a polarizing plate. Typical examples of the image display device include a liquid crystal display device and an Electroluminescence (EL) display device (for example, an organic EL display device and an inorganic EL display device). In one embodiment, the image display device is a narrow-bezel (preferably borderless) image display device or an in-line image display device. In such an image display device, the effect of the embodiment of the present invention is remarkable.
Examples
Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited to these examples. The measurement method of each characteristic is as follows. Unless otherwise specified, "parts" and "%" in examples and comparative examples are weight basis.
(1) Thickness of (L)
The thickness of 10 μm or less was measured by an interferometer film thickness meter (product name "MCPD-3000" manufactured by Otsuka electronics Co., ltd.). The thickness exceeding 10 μm was measured using a digital micrometer (product name "KC-351C", manufactured by Anritsu GS).
(2) Surface resistance value
The resistance values of the adhesive layer surfaces of the polarizing plates (adhesive layer-equipped polarizing plates) obtained in examples and comparative examples were measured as initial resistance values using Mitsubishi Chemical Analytech co. The polarizing plate with the adhesive layer was subjected to reliability tests under 2 different conditions (500 hours at 85 ℃ C. And 500 hours at 60 ℃ C. And 95% RH), and then the electric resistance was measured in the same manner as described above. The rate of resistance increase was calculated by the following equation.
Resistance value increase rate=resistance value after reliability test/initial resistance value
Further, the evaluation was performed according to the following criteria.
O: a resistance value increase rate of 10 or less
X: the rate of rise of the resistance value is greater than 10
(3) ESD test
The polarizing plates (polarizing plates with an adhesive layer) obtained in examples and comparative examples were cut out 70mm×150mm, and bonded to a liquid crystal panel via an adhesive layer. Next, silver paste was applied to the side surface portion of the laminated pressure-sensitive adhesive layer-attached polarizing plate so as to cover the entire thickness direction area of the side surface portion of the pressure-sensitive adhesive layer-attached polarizing plate, and the side surface portion was connected to an external ground electrode. Next, the surface of the polarizing plate with the adhesive layer was irradiated (applied) 10 times in total at 1 second intervals in such a manner that circles were drawn in the polarizing plate surface using ESD (manufactured by ESD-8012A, SANKI corporation) (applied voltage 15 kV) as an electrostatic generator, which resulted in disorder of alignment of the liquid crystal panel. The time for the portion of the white spot to disappear due to static electricity was measured, and evaluated according to the following criteria.
O: the white spot disappears within 5 seconds
Delta: the white spot disappears within 10 seconds
X: residual white spot for more than 10 seconds
(4) Durability test
The produced polarizing plate (polarizing plate with an adhesive layer) was cut into a size of 300X 220mm so that the absorption axis of the polarizer was parallel to the long side. The polarizing plate was laminated on an alkali-free glass (trade name "EG-XG" manufactured by Corning Co., ltd.) having a thickness of 350X 250mm X0.7 mm by means of a laminator. Then, autoclave treatment was performed at 50℃and 0.5MPa for 15 minutes to bond the adhesive layer to glass. The implementation is carried out under an atmosphere of 85 DEG C After the sample treated as described above was subjected to treatment for 500 hours, the appearance of the sample was evaluated by visual observation according to the following criteria. Besides 85℃the process was carried out at 60℃for 95%, 500h, HS (to be
Figure BDA0004113475970000131
As 1 cycle) for 300 cycles, the evaluation was performed according to the following criteria.
And (3) the following materials: no change in appearance such as foaming and peeling was observed at all.
O: there was little peeling at the end or foaming, but there was no problem in practical use.
Delta: the end portion is peeled off or foamed, but there is no problem in practical use as long as it is not a special use.
X: there is a significant peeling at the end, which is practically problematic.
(5) Cracking of profiled portion
Through holes having a diameter of 3.9mm were formed at the corners of the polarizing plates obtained in examples and comparative examples using end milling. The polarizing plate having the through-holes formed therein was bonded to a glass plate via an adhesive layer, and the resultant was used as a test sample. The test sample was subjected to a thermal shock test in which an operation cycle of-40 ℃ for 30 minutes after being held at 85 ℃ for 30 minutes was repeated 300 times, and the appearance of the through-hole portion after the test was visually observed and evaluated according to the following criteria. In any of the examples and comparative examples, no paste defect (phenomenon of edge defect of the adhesive layer) occurred.
O: no crack was confirmed
Delta: there are cracks, but there are no practical problems as long as they are not of special use.
X: the crack was confirmed.
Production example 1: preparation of (meth) acrylic base Polymer A1
A four-necked flask equipped with a stirring blade, a thermometer, a nitrogen inlet tube, and a condenser was charged with a monomer mixture containing 39 parts of Butyl Acrylate (BA), 60 parts of methoxyethyl acrylate (MEA), and 1 part of 4-hydroxybutyl acrylate (4 HBA). Further, 0.1 part of 2,2' -azobisisobutyronitrile as a polymerization initiator was added to 100 parts of the monomer mixture together with 100 parts of ethyl acetate, and after nitrogen substitution by introducing nitrogen gas while stirring slowly, the liquid temperature in the flask was kept at about 55℃for 8 hours to perform polymerization reaction, thereby preparing a solution of (meth) acrylic base polymer A1. The Tg and dielectric constant of the (meth) acrylic base polymer A1 are shown in table 1. The dielectric constant was measured by a conventional method. For Tg, a value obtained by converting Tg of each monomer by using a polymerization ratio was calculated.
Production example 2: preparation of (meth) acrylic base Polymer A2
A solution of (meth) acrylic base polymer A2 was prepared in the same manner as in production example 1 except that a monomer mixture containing 59 parts of BA, 40 parts of MEA and 1 part of 4HBA was used. The Tg and dielectric constant of the (meth) acrylic base polymer A2 are shown in table 1.
Production example 3: preparation of (meth) acrylic base Polymer A3
A solution of (meth) acrylic base polymer A3 was prepared in the same manner as in production example 1 except that a monomer mixture containing 79 parts of BA, 20 parts of MEA and 1 part of 4HBA was used. The Tg and dielectric constant of the (meth) acrylic base polymer A3 are shown in table 1.
Production example 4: preparation of (meth) acrylic base Polymer A4
A solution of (meth) acrylic base polymer A4 was prepared in the same manner as in production example 1, except that 60 parts of ethoxyethoxyethyl acrylate (EEEA) was used instead of 60 parts of MEA. The Tg and dielectric constant of the (meth) acrylic base polymer A4 are shown in table 1.
Production example 5: preparation of (meth) acrylic base Polymer A5
A solution of (meth) acrylic base polymer A5 was prepared in the same manner as in production example 1, except that 60 parts of methoxytriethylene glycol acrylate (MTGA) was used instead of 60 parts of MEA. The Tg and dielectric constant of the (meth) acrylic base polymer A5 are shown in table 1.
Production example 6: preparation of (meth) acrylic base Polymer A6
A solution of (meth) acrylic base polymer A6 was prepared in the same manner as in production example 1, except that a monomer mixture containing 99 parts of MTGA and 1 part of 4HBA was used. The Tg and dielectric constant of the (meth) acrylic base polymer A6 are shown in table 1.
Production example 7: preparation of (meth) acrylic base Polymer A7
A solution of (meth) acrylic base polymer A7 was prepared in the same manner as in production example 1 except that a monomer mixture containing 49 parts of BA, 50 parts of MTGA and 1 part of 4HBA was used. The Tg and dielectric constant of the (meth) acrylic base polymer A7 are shown in table 1.
Production example 8: preparation of (meth) acrylic base Polymer A8
A solution of (meth) acrylic base polymer A8 was prepared in the same manner as in production example 1 except that a monomer mixture containing 69 parts of BA, 30 parts of MTGA and 1 part of 4HBA was used. The Tg and dielectric constant of the (meth) acrylic base polymer A8 are shown in table 1.
Production example 9: preparation of (meth) acrylic base Polymer A9
A solution of (meth) acrylic base polymer A9 was prepared in the same manner as in production example 7, except that 50 parts of methoxypolyethylene glycol acrylate (MPEA) was used instead of 50 parts of MTGA. The Tg and dielectric constant of the (meth) acrylic base polymer A9 are shown in table 1.
Production example 10: preparation of (meth) acrylic base Polymer A10
A solution of (meth) acrylic base polymer a10 was prepared in the same manner as in production example 9, except that 50 parts of methoxypolyethylene glycol acrylate PEA550 (manufactured by osaka organic chemical corporation) was used instead of 50 parts of methoxypolyethylene glycol acrylate (MPEA). The Tg and dielectric constant of the (meth) acrylic base polymer a10 are shown in table 1.
Production example 11: preparation of (meth) acrylic base Polymer A11
A solution of (meth) acrylic base polymer a11 was prepared in the same manner as in production example 7, except that 50 parts of phenoxyethyl acrylate (PEA) was used instead of 50 parts of MTGA. The Tg and dielectric constant of the (meth) acrylic base polymer a11 are shown in table 1.
Production example 12: preparation of (meth) acrylic base Polymer A12
A solution of (meth) acrylic base polymer a12 was prepared in the same manner as in production example 5, except that 50 parts of tetrahydrofurfuryl acrylate was used instead of 50 parts of MTGA. The Tg and dielectric constant of the (meth) acrylic base polymer a12 are shown in table 1.
Production example 13: preparation of (meth) acrylic base Polymer A13
A solution of (meth) acrylic base polymer A13 was prepared in the same manner as in production example 7 except that 50 parts of (2-methyl-2-ethyl-1, 3-dioxolan-4-yl) methyl acrylate was used instead of 50 parts of MTGA. The Tg and dielectric constant of the (meth) acrylic base polymer a13 are shown in table 1.
Production example 14: preparation of (meth) acrylic base Polymer A14
A solution of (meth) acrylic base polymer A14 was prepared in the same manner as in production example 5, except that 50 parts of (3-ethyloxetan-3-yl) methyl acrylate was used instead of 50 parts of MTGA. The Tg and dielectric constant of the (meth) acrylic base polymer a14 are shown in table 1.
Production example 15: preparation of (meth) acrylic base Polymer A15
A solution of (meth) acrylic base polymer A15 was prepared in the same manner as in production example 7, except that 50 parts of trimethylolpropane formal acrylate was used instead of 50 parts of MTGA. The Tg and dielectric constant of the (meth) acrylic base polymer a15 are shown in table 1.
Production example 16: preparation of (meth) acrylic base Polymer A16
A solution of (meth) acrylic base polymer A16 was prepared in the same manner as in production example 1, except that a monomer mixture comprising 80.3 parts of BA, 0.2 part of Acrylic Acid (AA), 16 parts of PEA, 3 parts of N-vinylpyrrolidone (NVP) and 0.5 parts of 4HBA was used. The Tg and dielectric constant of the (meth) acrylic base polymer a16 are shown in table 1.
Production example 17: preparation of (meth) acrylic base Polymer A17
A solution of (meth) acrylic base polymer A17 was prepared in the same manner as in production example 1 except that a monomer mixture containing 99 parts of BA and 1 part of 4HBA was used. The Tg and dielectric constant of the (meth) acrylic base polymer a17 are shown in table 1.
Production example 18: preparation of (meth) acrylic base Polymer A18
A solution of (meth) acrylic base polymer A18 was prepared in the same manner as in production example 1 except that a monomer mixture containing 56 parts of BA and 1 part of 4HBA, 14 parts of PEA and 29 parts of MA was used. The Tg and dielectric constant of the (meth) acrylic base polymer a18 are shown in table 1.
Production example 19: production of polarizer P1
1. Manufacture of polarizer
As the thermoplastic resin base material, an amorphous isophthalic acid copolymerized polyethylene terephthalate film (thickness: 100 μm) having a long water absorption of 0.75% and a Tg of about 75℃was used. One side of the resin base material was subjected to corona treatment.
To 100 parts by weight of a PVA-based resin obtained by mixing polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl-modified PVA (trade name "GOHSEFIMER Z410" manufactured by Nippon chemical industries Co., ltd.) at 9:1, 13 parts by weight of potassium iodide was added, and the obtained mixture was dissolved in water to prepare a PVA aqueous solution (coating liquid).
The PVA aqueous solution was applied to the corona treated surface of the resin substrate, and dried at 60 ℃ to form a PVA-based resin layer having a thickness of 13 μm, thereby producing a laminate.
The resulting laminate was subjected to free-end unidirectional stretching to 2.4 times in the longitudinal direction (longitudinal direction) between rolls having different peripheral speeds in an oven at 130 ℃.
Next, the laminate was immersed in an insolubilization bath (an aqueous boric acid solution obtained by mixing 4 parts by weight of boric acid with 100 parts by weight of water) at a liquid temperature of 40 ℃ for 30 seconds (insolubilization treatment).
Next, in a dyeing bath (aqueous iodine solution obtained by mixing iodine and potassium iodide in a weight ratio of 1:7 with respect to 100 parts by weight of water) at a liquid temperature of 30 ℃, the concentration was adjusted so that the monomer transmittance (Ts) of the final polarizer became a predetermined value, and the resulting polarizer was immersed for 60 seconds (dyeing treatment).
Then, the resultant solution was immersed in a crosslinking bath (an aqueous boric acid solution obtained by mixing 100 parts by weight of water with 3 parts by weight of potassium iodide and 5 parts by weight of boric acid) at a liquid temperature of 40℃for 30 seconds (crosslinking treatment).
Then, while immersing the laminate in an aqueous boric acid solution (boric acid concentration 4.0 wt% and potassium iodide concentration 5 wt%) at a liquid temperature of 70 ℃, unidirectional stretching (stretching treatment in an aqueous solution) was performed between rolls having different peripheral speeds in the longitudinal direction (longitudinal direction) so that the total stretching ratio became 5.5 times.
Then, the laminate was immersed in a washing bath (aqueous solution obtained by mixing 100 parts by weight of water with 4 parts by weight of potassium iodide) at a liquid temperature of 20 ℃ (washing treatment).
Then, drying was performed in an oven maintained at 90 ℃ while being brought into contact with a SUS-made heating roller maintained at a surface temperature of 75 ℃ for about 2 seconds (drying shrinkage treatment). The shrinkage of the laminate in the width direction due to the drying shrinkage treatment was 5.2%.
Thus, a polarizer having a thickness of 7 μm was formed on the resin substrate.
2. Manufacture of polarizer
An HC-TAC film as a protective layer was bonded to the surface (the surface opposite to the resin substrate) of the polarizer obtained as described above via an ultraviolet curable adhesive. Specifically, the cured adhesive was applied so that the total thickness of the cured adhesive became 1.0 μm, and bonded using a roll machine. Then, UV light is irradiated from the protective layer side to cure the adhesive. The HC-TAC film was formed by laminating a Hard Coat (HC) layer (thickness 7 μm) on a cellulose Triacetate (TAC) film (thickness 25 μm) so that the TAC film was on the polarizer side. Next, the resin substrate was peeled off, and a cellulose Triacetate (TAC) film (thickness 25 μm) was attached to the peeled surface via an ultraviolet curable adhesive. Thus, a polarizer P1 having a configuration of a protective layer (HC layer/TAC film)/adhesive layer/polarizer/adhesive layer/protective layer (TAC film) was obtained.
Production example 20: production of polarizer P2
Polyvinyl alcohol films having a thickness of 30 μm were dyed in an iodine solution having a concentration of 0.3% at 30℃between rolls having different speed ratios for 1 minute while being stretched to 3 times. Then, the resultant was immersed in an aqueous solution of 4% boric acid and 10% potassium iodide at 60℃for 0.5 minutes, and stretched until the total stretching ratio became 6 times. Then, the resultant was immersed in an aqueous solution containing 1.5% potassium iodide at 30℃for 10 seconds to clean the film, and then dried at 50℃for 4 minutes to obtain a polarizer having a thickness of 12. Mu.m. An HC-TAC film was attached to one surface of the polarizer in the same manner as in production example 15. An acrylic film (thickness: 20 μm) having a lactam ring structure was further bonded to the other surface of the polarizer via an ultraviolet-curable adhesive (thickness: 1.0 μm). Thus, a polarizer P2 having a structure of a protective layer (HC layer/TAC film)/adhesive layer/polarizer/adhesive layer/protective layer (acrylic film) was obtained.
Production example 21: production of polarizer P3
A polarizing plate P3 was obtained in the same manner as in production example 20, except that a cyclic olefin resin (COP) film (thickness 13 μm) was used instead of the acrylic film.
Production example 22: production of polarizer P4
A polarizing plate P4 was obtained in the same manner as in production example 19, except that the thickness of the polarizer was set to 5 μm, and a cellulose Triacetate (TAC) film was not provided on the release surface of the resin substrate.
Example 1
1. Preparation of adhesive composition
A solution of an acrylic adhesive composition was prepared by mixing 100 parts of the solid content of the solution of (meth) acrylic base polymer A1 obtained in production example 1 with 3 parts of an antistatic agent (trade name: liTFSi30EA, manufactured by Mitsubishi materials Co., ltd.), 0.3 part of benzoyl peroxide (trade name: nyper BMT 40SV, manufactured by Japanese fat & oil Co., ltd.), 0.2 part of an isocyanate-based crosslinking agent (trade name: takenate D110N, manufactured by Mitsui chemical Co., ltd.), 0.03 part of a reworkability improver (trade name: SILYL SAT10, manufactured by Zhong Hua Co., ltd.), 0.3 part of an antioxidant (trade name: irganox 1010, hindered phenols, manufactured by BASF Japan Co., ltd.), and 0.2 part of a silane coupling agent (trade name: A-100, manufactured by Holso chemical Co., ltd.).
2. Production of adhesive layer-carrying polarizing plate
The solution of the acrylic adhesive composition obtained above was applied to one surface of a polyethylene terephthalate film (trade name "MRF38", separator, manufactured by Mitsubishi chemical polyester film) treated with a silicone release agent, and dried at 155℃for 1 minute to give an adhesive layer having a thickness of 15. Mu.m, and an adhesive layer was formed on the surface of the separator. Next, the adhesive layer formed on the separator was transferred to the protective layer on the inner side of the polarizing plate P1 produced in production example 20, and a polarizing plate with an adhesive layer was produced. The obtained polarizing plate with an adhesive layer was subjected to the evaluations of the above (2) to (5), and the results are shown in table 1.
Examples 2 to 27 and comparative examples 1 to 12
A polarizing plate with an adhesive layer was produced according to the combination of the polarizing plates and the adhesive layer shown in table 1. The results are shown in Table 1. The antistatic agent in table 1 is abbreviated as follows.
LiTFSI: lithium bis (trifluoromethanesulfonyl) imide
EMI-FSI: 1-ethyl-3-methylimidazole bis (fluorosulfonyl) imide salt
TBMA-TFSI: tributyl methyl ammonium bis (trifluoromethanesulfonyl) imide
Figure BDA0004113475970000201
[ evaluation ]
As is clear from table 1, the polarizing plate of the example of the present invention showed good results in the ESD test, maintained a low surface resistance value even after the reliability test, and was excellent in durability. In addition, the polarizing plates of the embodiments of the present invention each favorably suppress cracks during the profile processing.
Industrial applicability
The polarizing plate of the present invention can be applied to image display devices such as liquid crystal display devices, organic EL display devices, and inorganic EL display devices.

Claims (13)

1. A polarizing plate comprising an adhesive layer, wherein the polarizing plate has a special-shaped structure,
the adhesive composition constituting the adhesive layer comprises a base polymer and an antistatic agent,
the base polymer has a glass transition temperature of-50 ℃ or lower and a dielectric constant of 5.0 or higher at 100kHz,
The adhesive layer had a surface resistance value of 1.0X10 9 Ω/≡or less.
2. The polarizing plate according to claim 1, wherein,
the base polymer contains an alkoxy group-containing monomer as a monomer component.
3. The polarizing plate according to claim 2, wherein,
the base polymer comprises 30 to 99 parts by weight of the alkoxy group-containing monomer per 100 parts by weight of the entire monomer components.
4. The polarizing plate according to claim 3, wherein,
the alkoxy group-containing monomer is represented by the following formula,
Figure FDA0004113475950000011
wherein R is 1 Is alkyl, n is an integer of 1 to 15.
5. The polarizing plate according to claim 4, wherein,
the base polymer further comprises a hydroxyl group-containing monomer as a monomer component.
6. The polarizing plate according to any one of claims 1 to 5, wherein,
the antistatic agent is contained in the adhesive composition in an amount of less than 10 parts by weight relative to 100 parts by weight of the base polymer.
7. The polarizing plate according to any one of claims 1 to 6, wherein,
the antistatic agent comprises lithium bis (trifluoromethanesulfonyl) imide, 1-ethyl-3-methylimidazole bis (fluorosulfonyl) imide salt, or tributyl methylammonium bis (trifluoromethanesulfonyl) imide.
8. The polarizing plate according to any one of claims 1 to 7, wherein,
the adhesive composition further comprises a silane coupling agent.
9. The polarizing plate according to any one of claims 1 to 8, wherein,
the adhesive composition further comprises an antioxidant.
10. The polarizing plate according to any one of claims 1 to 9, wherein,
the adhesive force of the adhesive layer to glass is more than 1.0N/25 mm.
11. The polarizing plate according to any one of claims 1 to 10, wherein,
the rate of increase in resistance value by the heating test represented by the following formula is 10 or less,
resistance value increase rate=resistance value after reliability test/initial resistance value
Wherein the heating test is performed at a temperature of 85 ℃ for 500 hours.
12. The polarizing plate according to any one of claims 1 to 11, wherein,
the rate of increase of the resistance value in the humidification test represented by the following formula is 10 or less,
resistance value increase rate=resistance value after reliability test/initial resistance value
Wherein the humidification test was performed at a temperature of 60℃and a humidity of 95% RH for 500 hours.
13. An image display device provided with the polarizing plate according to any one of claims 1 to 12.
CN202180057603.3A 2020-11-05 2021-11-01 Polarizing plate and image display device using same Pending CN116097137A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2020184803A JP2022074622A (en) 2020-11-05 2020-11-05 Polarizer and image display device
JP2020-184803 2020-11-05
JP2021028858A JP2022129959A (en) 2021-02-25 2021-02-25 Polarizing plate and picture display unit using the same
JP2021-028858 2021-02-25
PCT/JP2021/040189 WO2022097595A1 (en) 2020-11-05 2021-11-01 Polarizing plate and image display device using same

Publications (1)

Publication Number Publication Date
CN116097137A true CN116097137A (en) 2023-05-09

Family

ID=81457925

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202180057603.3A Pending CN116097137A (en) 2020-11-05 2021-11-01 Polarizing plate and image display device using same

Country Status (4)

Country Link
KR (1) KR20230098096A (en)
CN (1) CN116097137A (en)
TW (1) TW202225364A (en)
WO (1) WO2022097595A1 (en)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5393393B2 (en) * 2008-10-21 2014-01-22 日本合成化学工業株式会社 Adhesive composition and pressure-sensitive adhesive, and pressure-sensitive adhesive for optical members, and optical member with a pressure-sensitive adhesive layer obtained using the same
TW201107437A (en) * 2009-06-09 2011-03-01 Nippon Synthetic Chem Ind Adhesive compositions and adhesive, adhesive for optical members and optical member with adhesive layer using it
JP2014189786A (en) * 2013-03-28 2014-10-06 Nitto Denko Corp Adhesive composition, adhesive sheet and optical film
JP2015193371A (en) 2014-03-27 2015-11-05 日本電産エレシス株式会社 Electronic control device for electric power steering
KR20160107646A (en) * 2015-03-04 2016-09-19 동우 화인켐 주식회사 Adhesive Composition and Polarizing Plate Comprising the Same
JP6570280B2 (en) * 2015-03-17 2019-09-04 綜研化学株式会社 Adhesive for optical member and optical laminate
KR20170065885A (en) * 2015-12-04 2017-06-14 동우 화인켐 주식회사 Antistatic and adhesive composition and polarizing plate using the composition
JP7291474B2 (en) * 2018-12-04 2023-06-15 三星エスディアイ株式会社 OPTICAL FILM ADHESIVE, ADHESIVE LAYER, OPTICAL MEMBER, AND IMAGE DISPLAY DEVICE
JP7343316B2 (en) * 2018-12-17 2023-09-12 日東電工株式会社 Image display panel with bezel, image display device and optical film with adhesive layer
JP6757831B2 (en) * 2019-07-17 2020-09-23 藤森工業株式会社 Surface protective film and optical members

Also Published As

Publication number Publication date
TW202225364A (en) 2022-07-01
WO2022097595A1 (en) 2022-05-12
KR20230098096A (en) 2023-07-03

Similar Documents

Publication Publication Date Title
KR101679652B1 (en) Adhesive layer and adhesive film
CN105440989A (en) Polarizing plate with pressure-sensitive adhesive layer
WO2021240882A1 (en) Polarizing plate with retardation layer and adhesive layer and organic electroluminescence display device using same
CN116097138A (en) Polarizing plate and image display device using same
TW202128918A (en) Polarizing plate with phase difference layer and adhesive layer and organic electro luminescence display device using same
CN106990471B (en) Polarizing plate and liquid crystal panel
CN114631135A (en) Image display device and optical member set
CN110382648B (en) Adhesive layer, single-sided protective polarizing film with adhesive layer, image display device, and continuous production method therefor
CN106957610B (en) Spacer-attached adhesive layer, spacer-attached optical film, image display device, and methods for manufacturing spacer-attached adhesive layer and image display device
CN116097137A (en) Polarizing plate and image display device using same
TWI699284B (en) Peel film for antistatic surface-protective film and antistatic surface-protective film attached with the same
TWI719037B (en) Surface-protective film and optical component attached with the same
TWI699285B (en) Surface-protective film and optical component attached with the same
CN114641711B (en) Image display device and optical component group
KR102372688B1 (en) (meth)acrylic-based resin composition and (meth)acrylic-based resin film
JP2022129959A (en) Polarizing plate and picture display unit using the same
WO2023026687A1 (en) Adhesive composition, polarizing plate, and image display device using same
WO2023234100A1 (en) Polarizing plate with retardation layer and image display device
JP7370401B2 (en) Polarizing plate with adhesive layer and image display device using the same
JP7461860B2 (en) Polarizing plate and image display device using the same
CN112654685B (en) Radical adhesive composition, adhesive layer, polarizing plate and image display device
WO2024106095A1 (en) Adhesive sheet, optical multilayer body and image display device
TWI502227B (en) Optical antistaric adhesion coating layer, method of preparing an optical antistaric adhesion coating material, and method of fabricating an optical antistaric adhesion coating layer
CN106873069B (en) Polarizing plate and liquid crystal panel
TW202302356A (en) Method for manufacturing image display panel, surface protective film, and polarizing plate with surface protective film

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination