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WO2017026078A1 - Polarizing plate, image display device, and method for manufacturing polarizing plate - Google Patents

Polarizing plate, image display device, and method for manufacturing polarizing plate Download PDF

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Publication number
WO2017026078A1
WO2017026078A1 PCT/JP2015/083266 JP2015083266W WO2017026078A1 WO 2017026078 A1 WO2017026078 A1 WO 2017026078A1 JP 2015083266 W JP2015083266 W JP 2015083266W WO 2017026078 A1 WO2017026078 A1 WO 2017026078A1
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WO
WIPO (PCT)
Prior art keywords
polarizer
polarizing plate
protective film
laminated
film
Prior art date
Application number
PCT/JP2015/083266
Other languages
French (fr)
Japanese (ja)
Inventor
幸治 植田
幹士 藤井
幸二朗 西
Original Assignee
住友化学株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Priority to KR1020187003117A priority Critical patent/KR101945164B1/en
Priority to PCT/JP2016/073152 priority patent/WO2017026403A1/en
Priority to JP2016553482A priority patent/JP6279093B2/en
Priority to CN201680045811.0A priority patent/CN107850724B/en
Priority to TW105125421A priority patent/TWI644130B/en
Publication of WO2017026078A1 publication Critical patent/WO2017026078A1/en
Priority to JP2017184956A priority patent/JP2018028668A/en

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • 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

Definitions

  • the present invention relates to a polarizing plate, an image display device, and a method for manufacturing a polarizing plate.
  • a polarizing plate is known as one of optical components constituting a liquid crystal display device or the like.
  • a polarizing plate has a protective film laminated on one side or both sides of a polarizer to compensate for the mechanical strength, thermal stability, water resistance, and the like of the polarizer.
  • a transparent protective layer is provided on one or both sides of a polarizer as a polymer coating layer or a film laminate layer.
  • the end portion (side surface side) of the polarizer is not sufficiently protected. In fact, scratches and cracks may occur at the ends of the polarizer when the polarizing plate is attached to the liquid crystal cell or during subsequent handling.
  • an object of the present invention is to provide a polarizing plate in which the end portion of the polarizer is sufficiently protected, and a method for producing the polarizing plate. Moreover, it aims at providing an image display apparatus provided with the said polarizing plate.
  • the present invention includes a polarizer and a protective film laminated on both sides thereof, and the protective films are all formed in a predetermined shape, and the protective films are respectively formed on the entire surface of one side of the polarizer.
  • a polarizing plate that is laminated and at least a part of an end of a polarizer is located inside an end of at least one protective film.
  • the end portion of the polarizer is physically protected because the end portion of the polarizer is located inside the end portion of at least one protective film. Therefore, when the side surface of the polarizing plate receives an impact during the handling of the polarizing plate, it is possible to prevent the end of the polarizer from being scratched or cracked.
  • At least a part of the end portions of the polarizer may be located inside the end portions of both protective films. In this case, since the edge part of a polarizer is protected from both surfaces of a polarizer, it is further prevented that a crack and a crack arise in the edge part of a polarizer.
  • all the end portions of the polarizer may be located inside the end portions of at least one protective film. In this case, all ends of the polarizer are protected.
  • the polarizing plate of the present invention may have a shape in plan view that matches the shape of the region to which the polarizing plate is attached, for example, a quadrangle in plan view. Such a shape is easy to apply to various articles such as a liquid crystal display device.
  • a separator is laminated via an adhesive layer on the side where the polarizer of one of the protective films is not laminated, and the side where the polarizer of the other protective film is not laminated.
  • a temporary protective film may be laminated.
  • the protective film is prevented from being damaged and worn, and when the polarizing plate is used, the separator is peeled off to expose the pressure-sensitive adhesive layer, and the polarizing plate can be adhered to other articles by the adhesive force. it can.
  • the present invention provides an image display device including the polarizing plate. For example, even when a liquid crystal display device in which the polarizing plate is attached to a liquid crystal cell or the like is configured, the end of the polarizer is physically protected.
  • a polarizer is laminated on the first protective film formed into a predetermined shape so that the entire surface of one side is covered with the first protective film, and the other polarizer is attached to the polarizer.
  • a method for producing a polarizing plate in which a first protective film, a polarizer, and a second protective film are laminated so as to be located on the inner side of the end portion.
  • the polarizing plate can be manufactured by this manufacturing method.
  • a polarizing plate in which the end of the polarizer is sufficiently protected, and a method for manufacturing the polarizing plate.
  • an image display device including the polarizing plate can be provided.
  • FIG. 1st Embodiment of this invention It is a perspective view of the polarizing plate of the 1st Embodiment of this invention.
  • A) is IIa-IIa sectional drawing of FIG.
  • B) is IIb-IIb sectional drawing of FIG. It is sectional drawing of the polarizing plate of the 2nd Embodiment of this invention. It is sectional drawing of a liquid crystal display device.
  • the polarizing plate 1 ⁇ / b> A of the present embodiment is formed by laminating protective films 3 and 3 on both surfaces of a polarizer 2 formed in a thin film shape.
  • the protective films 3 and 3 are both formed in the same rectangular shape in plan view, and this shape is also the appearance of the polarizing plate 1A. That is, the polarizing plate 1A has a rectangular shape in plan view.
  • the size of the main surface of the polarizing plate 1A that is, the size of the protective films 3 and 3 can be arbitrarily set according to the application target of the polarizing plate 1A.
  • the ratio of the lengths of adjacent sides that is, the aspect ratio of the polarizing plate 1A is preferably 1: 9 to 5: 5, more preferably 2: 8 to 5: 5, and 3: 7. More preferably, it is ⁇ 5: 5.
  • the end 2a of the polarizer 2 is located on the inner side of the ends 3a and 3a of the protective films 3 and 3 over the entire circumference. That is, in the cross-sectional view shown in FIG. 2, the side surface of the polarizing plate 1 ⁇ / b> A has a concave shape in which the side surface of the polarizer 2 is recessed with respect to the side surfaces of the protective films 3 and 3.
  • the end 2a of the polarizer 2 is preferably positioned 1 to 500 ⁇ m inside the ends 3a and 3a of the protective films 3 and 3, and more preferably positioned 1 to 300 ⁇ m inside. Preferably, it is located 1 to 50 ⁇ m inside.
  • the end 2a of the polarizer 2 is located inside by the same length over the perimeter of the polarizer 2 like this embodiment.
  • the effect of physically protecting the end 2a of the polarizer 2 is particularly high, and a wide display surface is ensured even when an image display device is configured. can do.
  • the lamination of the polarizer 2 and the protective film 3 may be configured by pasting the polarizer 2 and the protective film 3 formed into a film shape via an adhesive. 1 and 2 do not show the adhesive layer.
  • the material of the polarizer 2 a known material that has been conventionally used in the production of polarizing plates can be used.
  • the uniaxially stretched film is dyed with iodine or a dichroic dye and then treated with boric acid.
  • the film-like polarizer can be cut into an arbitrary size and used at the time of producing the polarizing plate.
  • the film-like polarizer 2 produced from these materials has low mechanical strength, thermal stability, and water resistance, and is particularly low at the end of the film. For this reason, the end of the polarizer 2 is likely to be cracked or scratched by handling during the production of the polarizing plate.
  • the thickness of the polarizer 2 is preferably 2 to 75 ⁇ m, more preferably 2 to 50 ⁇ m, and still more preferably 2 to 30 ⁇ m.
  • the protective film 3 is a film that prevents the main surface and end of the polarizer 2 from being cracked or damaged.
  • the “protective film” refers to a film physically laminated at a position closest to the polarizer 2 among various films that can be laminated on the polarizer 2.
  • the protective film 3 can be composed of various transparent resin films known in the field of polarizing plates.
  • cellulose resin whose typical example is triacetyl cellulose
  • polyolefin resin whose typical example is polypropylene resin
  • cyclic olefin resin whose typical example is norbornene resin
  • acrylic whose typical example is polymethyl methacrylate resin
  • polyester resins and polyester resins having polyethylene terephthalate resins as representative examples.
  • cellulose resin is representative.
  • the protective film 3 may be a film having no optical function, or may be a film having an optical function such as a retardation film or a brightness enhancement film.
  • the thickness of the protective film 3 is preferably 5 to 90 ⁇ m, more preferably 5 to 80 ⁇ m, and still more preferably 5 to 50 ⁇ m.
  • an adhesive is used in the lamination of the polarizer 2 and the protective film 3
  • various adhesives conventionally used for manufacturing polarizing plates can be used as the adhesive.
  • an epoxy resin that does not contain an aromatic ring in the molecule is preferable from the viewpoint of weather resistance, refractive index, cationic polymerizability, and the like.
  • cures by irradiation of active energy ray is preferable.
  • epoxy resin for example, a hydrogenated epoxy resin, an alicyclic epoxy resin, an aliphatic epoxy resin and the like are preferable.
  • polymerization initiators for example, photocationic polymerization initiators for polymerization by UV irradiation, thermal cationic polymerization initiators for polymerization by heat ray irradiation), and other additives (sensitizers, etc.) Can be added to prepare an epoxy resin composition for coating.
  • acrylic resins such as acrylamide, acrylate, urethane acrylate, and epoxy acrylate, and polyvinyl alcohol-based aqueous adhesives can be used.
  • the polarizing plate 1A is bonded to one side or both sides of a display cell (image display element) such as a liquid crystal cell.
  • the polarizing plate 1 ⁇ / b> A can further include another optical layer laminated on the protective film 3.
  • a reflective polarizing film that transmits a certain kind of polarized light and reflects polarized light having the opposite properties; a film with an antiglare function having an uneven surface; a film with a surface antireflection function; surface A reflective film having a reflective function; a transflective film having both a reflective function and a transmissive function; and a viewing angle compensation film.
  • the thickness of the polarizing plate 1A comprising three layers of the polarizer 2 and the protective films 3 and 3 is preferably 10 to 500 ⁇ m, more preferably 10 to 300 ⁇ m, and further preferably 10 to 200 ⁇ m. preferable.
  • the polarizing plate 1A can be manufactured as follows, for example. First, two protective films 3 and 3 are cut out into a rectangle from a long film roll made of a material constituting the protective film 3. The size and aspect ratio of the rectangle to be cut out are determined according to the application target of the polarizing plate 1A. An adhesive is applied to one side of one protective film (first protective film) 3. The region where the adhesive is applied is not the entire surface of the protective film 3, but the region where the film-like polarizer 2 is laminated.
  • the polarizer 2 is cut into a rectangle from a long film roll made of the material constituting the polarizer 2.
  • the size of the rectangle to be cut out is smaller than the size of the protective film 3.
  • the cut-out film-like polarizer 2 is laminated on the surface of the protective film 3 coated with an adhesive.
  • the lamination here is performed so that the entire surface of one side of the polarizer 2 enters the inside of the surface of the protective film 3.
  • the polarizer 2 is covered with the protective film.
  • an active energy ray-curable resin is used as the adhesive, the adhesive is cured by irradiating active energy rays here.
  • an adhesive is applied to the entire surface of the other side of the polarizer, and the remaining protective film (second protective film) 3 is laminated.
  • stacking of the protective film 3 here is performed so that the whole surface of the single side
  • the active energy ray-curable resin is used as the adhesive, the active energy ray is irradiated here to cure the adhesive.
  • the polarizing plate 1A is manufactured by the above procedure.
  • the end 2a of the polarizer 2 is located inside the end 3a of the protective film 3, the end of the polarizer 2 is physically protected. Accordingly, in handling such as when the polarizing plate 1A is attached to a liquid crystal cell, for example, when the side surface of the polarizing plate 1A receives an impact, only the end portion 3a of the protective film 3 receives the impact, and the polarizer 2 Scratches and cracks are prevented from occurring at the ends of the. This effect is also exhibited in further handling after the polarizing plate 1A is attached to a liquid crystal cell or the like. Moreover, it contributes to the durability improvement of the heat shock test of the polarizing plate 1A.
  • the polarizing plate 1 ⁇ / b> A has an end portion 2 a of the polarizer 2 protected by the end portions 3 a and 3 a of the protective films 3 and 3 laminated on both surfaces of the polarizer 2.
  • the effect is favorably exhibited in the tendency to change. That is, when the frame of the liquid crystal cell to which the polarizing plate 1A is attached has a normal width, the liquid crystal cell itself has a function of protecting the polarizer 2 from physical shock, but the liquid crystal cell has a narrow frame. If it exists, the effect of the protection becomes small. In this case, the ratio that the end 3a of the protective film 3 on the liquid crystal cell side contributes to the protection of the end 2a of the polarizer 2 is increased.
  • the polarizing plate 1A has a rectangular shape in plan view, it can be easily applied to various articles such as a liquid crystal display device.
  • a separator 4 and a temporary protective film 6 may be further laminated on a laminate of the polarizer 2 and the protective film 3.
  • the polarizing plate 1 ⁇ / b> B of the second embodiment is disposed on one side of the polarizing plate 1 ⁇ / b> A of the first embodiment (that is, on the surface of the one protective film 3 on which the polarizer 2 is not laminated) via the pressure-sensitive adhesive layer 5.
  • the separator 4 is laminated.
  • a temporary protective film 6 is laminated on the other surface of the polarizing plate 1A (that is, on the surface of the other protective film 3 on which the polarizer 2 is not laminated).
  • the pressure-sensitive adhesive layer 5 is a layer that functions when the polarizing plate 1B is attached to another article (for example, a liquid crystal cell).
  • the pressure-sensitive adhesive layer 5 can be composed of acrylic resin, silicone resin, polyester, polyurethane, polyether, or the like.
  • the thickness of the pressure-sensitive adhesive layer 5 is preferably 2 to 500 ⁇ m, more preferably 2 to 200 ⁇ m, still more preferably 2 to 50 ⁇ m.
  • a method of laminating the pressure-sensitive adhesive layer 5 on the protective film 3 for example, a method of applying a solution containing the resin or any additive component to the protective film 3 may be used. After forming, the method of laminating
  • the end 5a of the pressure-sensitive adhesive layer 5 is preferably aligned with the end 3a of the protective film 3 over the entire circumference.
  • the separator 4 is a peelable film that is stuck for the purpose of protecting the pressure-sensitive adhesive layer 5 and preventing adhesion of foreign matters, and is peeled off when the polarizing plate 1B is used to expose the pressure-sensitive adhesive layer 5.
  • the separator 4 can be made of, for example, a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester resin such as polyethylene terephthalate, or the like. Among these, a stretched film of polyethylene terephthalate is preferable.
  • the end 4a of the separator 4 is preferably aligned with the end 5a of the adhesive layer 5 over the entire circumference. Further, the separator 4 may be subjected to a release treatment with a silicone resin or the like on the surface in contact with the pressure-sensitive adhesive layer 5 so that the separator 4 can be easily peeled off when the polarizing plate 1B is used.
  • the thickness of the separator 4 is preferably 5 to 200 ⁇ m, more preferably 5 to 150 ⁇ m, still more preferably 5 to 100 ⁇ m.
  • the temporary protective film 6 is a peelable film and is a film for protecting the surface of the protective film 3 on which the temporary protective film 6 is laminated from being damaged or worn.
  • the same material as that of the protective film 3 can be used, and polyester resins such as polyethylene terephthalate, polyethylene naphthalate, polyethylene isophthalate, and polybutylene terephthalate are particularly preferable.
  • the temporary protective film 6 may have a pressure-sensitive adhesive layer having weak adhesion laminated on the surface of the film in addition to the film serving as the base material.
  • the temporary protective film 6 is laminated on the protective film 3 and then bonded to the protective film 3 until the polarizing plate 1B is used.
  • the temporary protective film 6 is peeled off from the protective film 3 when used.
  • the end 6a of the temporary protective film 6 is preferably aligned with the end 3a of the protective film 3 over the entire circumference.
  • the thickness of the temporary protective film 6 is preferably 5 to 200 ⁇ m, more preferably 5 to 150 ⁇ m, and still more preferably 5 to 100 ⁇ m.
  • the protective film 3 is prevented from being damaged or worn, and when the polarizing plate 1B is used, the separator 4 is peeled off to expose the adhesive layer 5, and the polarizing plate 1B is removed by the adhesive force.
  • An image display device can be configured by sticking to an article such as a liquid crystal cell or an organic EL device.
  • a liquid crystal cell as an example, as shown in FIG. 4, for example, a polarizing plate 1 ⁇ / b> B with a separator 4 peeled off is adhered to both surfaces of a liquid crystal cell 8 to form a liquid crystal panel 9.
  • the liquid crystal display device 10 can be manufactured by combining other members.
  • a touch panel or the like can be provided on the surface exposed by peeling off the temporary protective film 6.
  • the present invention is not limited to the above embodiment.
  • the end part 2a of the polarizer 2 showed the aspect located inside the edge part 3a, 3a of both the protective films 3 and 3 over the perimeter in the said embodiment, it is located inside.
  • the part to perform does not need to cover the whole periphery of the polarizer 2.
  • the end 2a of the polarizer 2 is protected only at the portion located on the inner side of the ends 3a and 3a of the protective films 3 and 3.
  • the entire length of the polarizer 2 is shown to be located on the inner side with the same length.
  • the degree of the depression of the polarizer 2 may be changed depending on the location. For example, when a portion that is susceptible to impact during handling of the polarizing plate is known in advance, it is preferable to increase the recess width of the end portion of the polarizer at that portion.
  • the one protective film 3 may have the same shape as the polarizer 2. That is, the end 3 a of one protective film 3 may be aligned with the end 2 a of the polarizer 2.
  • the polarizing plate 1A, 1B showed the example which is planar view rectangle in the said embodiment, other squares, for example, a trapezoid, a parallelogram, a square, etc. may be sufficient, and it may be circular or elliptical. Also good. That is, the polarizing plates 1A and 1B can have any shape according to the shape of the article to which the polarizing plates 1A and 1B are attached. In particular, the shape in plan view is the region where the polarizing plates 1A and 1B are attached. The shape may match the shape.
  • SYMBOLS 1A, 1B ... Polarizing plate, 2 ... Polarizer, 2a ... End of polarizer, 3 ... Protective film, 3a ... End of protective film, 4 ... Separator, 4a ... End of separator, 5 ... Adhesive layer, 5a ... end of pressure-sensitive adhesive layer, 6 ... temporary protective film, 6a ... end of temporary protective film, 8 ... liquid crystal cell, 9 ... liquid crystal panel, 10 ... liquid crystal display device (image display device).

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

A polarizing plate 1A is provided with a polarizer 2 and protective films 3, 3 layered on both sides of the polarizer 2. The protective films 3, 3 are both molded in a predetermined shape, the protective films 3, 3 are each layered on the entire surface of one side of the polarizer 2, and at least a portion of an end part 2a of the polarizer 2 is positioned further inside than an end part 3a of at least one protective film 3.

Description

偏光板、画像表示装置、及び偏光板の製造方法Polarizing plate, image display device, and manufacturing method of polarizing plate
　本発明は、偏光板、画像表示装置、及び偏光板の製造方法に関する。 The present invention relates to a polarizing plate, an image display device, and a method for manufacturing a polarizing plate.
　従来、液晶表示装置等を構成する光学部品の一つとして、偏光板が知られている。偏光板は一般に、偏光子の片面又は両面に保護フィルムが積層されており、偏光子の機械的強度、熱安定性、耐水性等が補われている。例えば特許文献１においては、偏光子の片面又は両面に、ポリマーによる塗布層として、又はフィルムのラミネート層として透明保護層（保護フィルム）が設けられている。 Conventionally, a polarizing plate is known as one of optical components constituting a liquid crystal display device or the like. In general, a polarizing plate has a protective film laminated on one side or both sides of a polarizer to compensate for the mechanical strength, thermal stability, water resistance, and the like of the polarizer. For example, in Patent Document 1, a transparent protective layer (protective film) is provided on one or both sides of a polarizer as a polymer coating layer or a film laminate layer.
特開２００２－３０３７３０号公報JP 2002-303730 A
　しかしながら、保護フィルムが積層された偏光子の主面については所期の保護効果が得られるものの、偏光子の端部（側面側）については保護が十分ではない。実際、偏光板を液晶セルに貼着する際やその後のハンドリングにおいて、偏光子の端部に傷やクラックが生じる場合がある。 However, although the intended protective effect is obtained for the main surface of the polarizer on which the protective film is laminated, the end portion (side surface side) of the polarizer is not sufficiently protected. In fact, scratches and cracks may occur at the ends of the polarizer when the polarizing plate is attached to the liquid crystal cell or during subsequent handling.
　そこで本発明は、偏光子の端部が十分に保護された偏光板、及びその偏光板の製造方法を提供することを目的とする。また、当該偏光板を備える画像表示装置を提供することを目的とする。 Therefore, an object of the present invention is to provide a polarizing plate in which the end portion of the polarizer is sufficiently protected, and a method for producing the polarizing plate. Moreover, it aims at providing an image display apparatus provided with the said polarizing plate.
　本発明は、偏光子と、その両面に積層された保護フィルムと、を備え、保護フィルムは、いずれも所定の形状に成形されたものであり、保護フィルムは、それぞれ偏光子の片面の全面に積層されており、偏光子の少なくとも一部の端部が、少なくとも一方の保護フィルムの端部よりも内側に位置している偏光板を提供する。 The present invention includes a polarizer and a protective film laminated on both sides thereof, and the protective films are all formed in a predetermined shape, and the protective films are respectively formed on the entire surface of one side of the polarizer. Provided is a polarizing plate that is laminated and at least a part of an end of a polarizer is located inside an end of at least one protective film.
　この偏光板では、偏光子の端部が少なくとも一方の保護フィルムの端部よりも内側に位置しているため、偏光子の端部が物理的に保護される。従って、偏光板のハンドリングにおいて偏光板の側面が衝撃を受けた場合に、偏光子の端部に傷やクラックが生じることが防止される。 In this polarizing plate, the end portion of the polarizer is physically protected because the end portion of the polarizer is located inside the end portion of at least one protective film. Therefore, when the side surface of the polarizing plate receives an impact during the handling of the polarizing plate, it is possible to prevent the end of the polarizer from being scratched or cracked.
　本発明では、偏光子の少なくとも一部の端部が、両方の保護フィルムの端部よりも内側に位置していてもよい。この場合、偏光子の両面から偏光子の端部が保護されることになるので、偏光子の端部に傷やクラックが生じることが一層防止される。 In the present invention, at least a part of the end portions of the polarizer may be located inside the end portions of both protective films. In this case, since the edge part of a polarizer is protected from both surfaces of a polarizer, it is further prevented that a crack and a crack arise in the edge part of a polarizer.
　また、偏光子の全ての端部が、少なくとも一方の保護フィルムの端部よりも内側に位置していてもよい。この場合、偏光子の全ての端部が保護される。 Further, all the end portions of the polarizer may be located inside the end portions of at least one protective film. In this case, all ends of the polarizer are protected.
　本発明の偏光板は、平面視形状が、当該偏光板を貼着する領域の形状に一致する形状であってもよく、例えば平面視四角形であってもよい。こうした形状であると、液晶表示装置等、種々の物品に適用しやすい。 The polarizing plate of the present invention may have a shape in plan view that matches the shape of the region to which the polarizing plate is attached, for example, a quadrangle in plan view. Such a shape is easy to apply to various articles such as a liquid crystal display device.
　本発明の偏光板は、いずれかの保護フィルムの偏光子が積層されていない側に、粘着剤層を介してセパレータが積層されており、他方の保護フィルムの偏光子が積層されていない側に、仮保護フィルムが積層されていてもよい。この場合、保護フィルムが損傷、摩損することが防止されるとともに、偏光板の使用時にはセパレータを剥がして粘着剤層を露出させ、その粘着力によって当該偏光板を他の物品に貼着することができる。 In the polarizing plate of the present invention, a separator is laminated via an adhesive layer on the side where the polarizer of one of the protective films is not laminated, and the side where the polarizer of the other protective film is not laminated. A temporary protective film may be laminated. In this case, the protective film is prevented from being damaged and worn, and when the polarizing plate is used, the separator is peeled off to expose the pressure-sensitive adhesive layer, and the polarizing plate can be adhered to other articles by the adhesive force. it can.
　本発明は、上記偏光板を備える画像表示装置を提供する。例えば上記偏光板を液晶セル等に貼着させた液晶表示装置を構成した場合でも、偏光子の端部が物理的に保護される。 The present invention provides an image display device including the polarizing plate. For example, even when a liquid crystal display device in which the polarizing plate is attached to a liquid crystal cell or the like is configured, the end of the polarizer is physically protected.
　また、本発明は、所定の形状に成形された第１の保護フィルムに、片面の全面が第１の保護フィルムに覆われるように偏光子を積層し、この偏光子に、偏光子の他方の片面の全面を覆うように第２の保護フィルムを積層する、偏光板の製造方法であって、偏光子が第１の保護フィルム及び第２の保護フィルムの少なくとも一方の保護フィルムの少なくとも一部の端部よりも内側に位置するように、第１の保護フィルム、偏光子、及び第２の保護フィルムを積層する、偏光板の製造方法を提供する。 In the present invention, a polarizer is laminated on the first protective film formed into a predetermined shape so that the entire surface of one side is covered with the first protective film, and the other polarizer is attached to the polarizer. A method of manufacturing a polarizing plate, wherein a second protective film is laminated so as to cover the entire surface of one side, wherein the polarizer is at least a part of at least one of the first protective film and the second protective film. Provided is a method for producing a polarizing plate, in which a first protective film, a polarizer, and a second protective film are laminated so as to be located on the inner side of the end portion.
　この製造方法によって、上記偏光板を製造することができる。 The polarizing plate can be manufactured by this manufacturing method.
　本発明によれば、偏光子の端部が十分に保護された偏光板、及びその偏光板の製造方法を提供することができる。また、当該偏光板を備える画像表示装置を提供することができる。 According to the present invention, it is possible to provide a polarizing plate in which the end of the polarizer is sufficiently protected, and a method for manufacturing the polarizing plate. In addition, an image display device including the polarizing plate can be provided.
本発明の第１の実施形態の偏光板の斜視図である。It is a perspective view of the polarizing plate of the 1st Embodiment of this invention. （ａ）は図１のIIa-IIa断面図である。（ｂ）は図１のIIb-IIb断面図である。(A) is IIa-IIa sectional drawing of FIG. (B) is IIb-IIb sectional drawing of FIG. 本発明の第２の実施形態の偏光板の断面図である。It is sectional drawing of the polarizing plate of the 2nd Embodiment of this invention. 液晶表示装置の断面図である。It is sectional drawing of a liquid crystal display device.
　以下、本発明の好適な実施形態について、図面を参照しながら詳細に説明する。なお、各図において同一部分又は相当部分には同一符号を付し、重複する説明は省略する。また、各図面の寸法比率は必ずしも実際のものとは一致せず、特に、厚さに関しては誇張して描いてある。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same part or an equivalent part, and the overlapping description is abbreviate | omitted. The dimensional ratios in the drawings do not necessarily match the actual ones, and in particular, the thickness is exaggerated.
＜第１の実施形態＞
　図１及び図２に示されているとおり、本実施形態の偏光板１Ａは、薄膜状に形成された偏光子２の両面の全面に保護フィルム３，３が積層されて成っている。保護フィルム３，３はいずれも平面視長方形の同形に成形されており、この形状が偏光板１Ａの外観形状ともなっている。すなわち、偏光板１Ａは、平面視長方形をなしている。 <First Embodiment>
As shown in FIGS. 1 and 2, the polarizing plate 1 </ b> A of the present embodiment is formed by laminating protective films 3 and 3 on both surfaces of a polarizer 2 formed in a thin film shape. The protective films 3 and 3 are both formed in the same rectangular shape in plan view, and this shape is also the appearance of the polarizing plate 1A. That is, the polarizing plate 1A has a rectangular shape in plan view.
　偏光板１Ａの主面の大きさ、すなわち保護フィルム３，３の大きさは、偏光板１Ａの適用対象に応じて任意に設定することができる。また、隣り合う辺の長さの比、すなわち偏光板１Ａの縦横比は、１：９～５：５であることが好ましく、２：８～５：５であることがより好ましく、３：７～５：５であることが更に好ましい。 The size of the main surface of the polarizing plate 1A, that is, the size of the protective films 3 and 3 can be arbitrarily set according to the application target of the polarizing plate 1A. The ratio of the lengths of adjacent sides, that is, the aspect ratio of the polarizing plate 1A is preferably 1: 9 to 5: 5, more preferably 2: 8 to 5: 5, and 3: 7. More preferably, it is ˜5: 5.
　偏光子２の端部２ａは、その全周に亘って、保護フィルム３，３の端部３ａ，３ａよりも内側に凹んで位置している。すなわち、図２に示された断面図において、偏光板１Ａの側面は、偏光子２の側面が保護フィルム３，３の側面に対して凹んだ凹形状をなしている。ここで、偏光子２の端部２ａは、保護フィルム３，３の端部３ａ，３ａよりも１～５００μｍ内側に位置していることが好ましく、１～３００μｍ内側に位置していることがより好ましく、１～５０μｍ内側に位置していることが更に好ましい。なかでも、本実施形態のように、偏光子２の全周に亘って同じ長さで内側に位置していることが好ましい。偏光子２の端部２ａがこれらの範囲に位置していると、偏光子２の端部２ａを物理的に保護する効果が特に高く、画像表示装置を構成した場合にも表示面を広く確保することができる。 The end 2a of the polarizer 2 is located on the inner side of the ends 3a and 3a of the protective films 3 and 3 over the entire circumference. That is, in the cross-sectional view shown in FIG. 2, the side surface of the polarizing plate 1 </ b> A has a concave shape in which the side surface of the polarizer 2 is recessed with respect to the side surfaces of the protective films 3 and 3. Here, the end 2a of the polarizer 2 is preferably positioned 1 to 500 μm inside the ends 3a and 3a of the protective films 3 and 3, and more preferably positioned 1 to 300 μm inside. Preferably, it is located 1 to 50 μm inside. Especially, it is preferable that it is located inside by the same length over the perimeter of the polarizer 2 like this embodiment. When the end 2a of the polarizer 2 is located within these ranges, the effect of physically protecting the end 2a of the polarizer 2 is particularly high, and a wide display surface is ensured even when an image display device is configured. can do.
　偏光子２と保護フィルム３との積層は、フィルム状に成形された偏光子２と保護フィルム３とを接着剤を介して貼合して構成されていてもよい。なお、図１及び図２では接着剤層を図示していない。 The lamination of the polarizer 2 and the protective film 3 may be configured by pasting the polarizer 2 and the protective film 3 formed into a film shape via an adhesive. 1 and 2 do not show the adhesive layer.
　偏光子２の材料としては、従来から偏光板の製造に使用されている公知の材料を用いることができ、例えば、ポリビニルアルコール系樹脂、ポリ酢酸ビニル樹脂、エチレン／酢酸ビニル（ＥＶＡ）樹脂、ポリアミド樹脂、ポリエステル系樹脂等が挙げられる。なかでもポリビニルアルコール系樹脂が好ましい。保護フィルム３と貼合するためにフィルム状に成形する場合は、一軸延伸したフィルムにヨウ素又は二色性染料による染色を施し、ついでホウ酸処理することが好ましい。後述するとおり、フィルム状の偏光子は、偏光板の製造時に任意の大きさに切り出して用いることができる。これらの材料から製造されたフィルム状の偏光子２は、機械的強度、熱安定性、耐水性が低く、特にフィルムの端部において低い。このため、偏光板製造時の取扱いにより、偏光子２の端部に割れや傷付きが生じやすい。 As the material of the polarizer 2, a known material that has been conventionally used in the production of polarizing plates can be used. For example, polyvinyl alcohol resin, polyvinyl acetate resin, ethylene / vinyl acetate (EVA) resin, polyamide Examples thereof include resins and polyester resins. Of these, polyvinyl alcohol resins are preferred. When forming into a film shape for bonding with the protective film 3, it is preferable that the uniaxially stretched film is dyed with iodine or a dichroic dye and then treated with boric acid. As will be described later, the film-like polarizer can be cut into an arbitrary size and used at the time of producing the polarizing plate. The film-like polarizer 2 produced from these materials has low mechanical strength, thermal stability, and water resistance, and is particularly low at the end of the film. For this reason, the end of the polarizer 2 is likely to be cracked or scratched by handling during the production of the polarizing plate.
　偏光子２の厚さは、２～７５μｍであることが好ましく、２～５０μｍであることがより好ましく、２～３０μｍであることが更に好ましい。 The thickness of the polarizer 2 is preferably 2 to 75 μm, more preferably 2 to 50 μm, and still more preferably 2 to 30 μm.
　保護フィルム３は、偏光子２の主面や端部の割れや傷つきを防止するフィルムである。ここで「保護フィルム」とは、偏光子２に種々積層され得るフィルムのなかでも、偏光子２に最も近い位置に物理的に積層されたフィルムを指している。 The protective film 3 is a film that prevents the main surface and end of the polarizer 2 from being cracked or damaged. Here, the “protective film” refers to a film physically laminated at a position closest to the polarizer 2 among various films that can be laminated on the polarizer 2.
　保護フィルム３は、偏光板の分野で知られている各種の透明樹脂フィルムで構成することができる。例えば、トリアセチルセルロースを代表例とするセルロース系樹脂、ポリプロピレン系樹脂を代表例とするポリオレフィン系樹脂、ノルボルネン系樹脂を代表例とする環状オレフィン系樹脂、ポリメチルメタクリレート系樹脂を代表例とするアクリル系樹脂、ポリエチレンテレフタレート系樹脂を代表例とするポリエステル系樹脂等が挙げられる。なかでも、セルロース系樹脂が代表的である。 The protective film 3 can be composed of various transparent resin films known in the field of polarizing plates. For example, cellulose resin whose typical example is triacetyl cellulose, polyolefin resin whose typical example is polypropylene resin, cyclic olefin resin whose typical example is norbornene resin, acrylic whose typical example is polymethyl methacrylate resin Examples thereof include polyester resins and polyester resins having polyethylene terephthalate resins as representative examples. Among these, cellulose resin is representative.
　保護フィルム３としては、光学機能を有しないフィルムであってもよいし、位相差フィルムや輝度向上フィルムといった光学機能を併せもつフィルムであってもよい。 The protective film 3 may be a film having no optical function, or may be a film having an optical function such as a retardation film or a brightness enhancement film.
　保護フィルム３の厚さは、５～９０μｍであることが好ましく、５～８０μｍであることがより好ましく、５～５０μｍであることが更に好ましい。 The thickness of the protective film 3 is preferably 5 to 90 μm, more preferably 5 to 80 μm, and still more preferably 5 to 50 μm.
　偏光子２と保護フィルム３との積層において接着剤を用いる場合、接着剤としては、従来から偏光板の製造に使用されている各種の接着剤を使用することができる。例えば、耐候性や屈折率、カチオン重合性等の観点から、分子内に芳香環を含まないエポキシ樹脂が好ましい。また、活性エネルギー線（紫外線又は熱線）の照射によって硬化するものが好ましい。 When an adhesive is used in the lamination of the polarizer 2 and the protective film 3, various adhesives conventionally used for manufacturing polarizing plates can be used as the adhesive. For example, an epoxy resin that does not contain an aromatic ring in the molecule is preferable from the viewpoint of weather resistance, refractive index, cationic polymerizability, and the like. Moreover, what hardens | cures by irradiation of active energy ray (an ultraviolet ray or a heat ray) is preferable.
　エポキシ樹脂としては、例えば水素化エポキシ樹脂、脂環式エポキシ樹脂、脂肪族エポキシ樹脂等が好ましい。エポキシ樹脂に対して、重合開始剤（例えば紫外線照射で重合させるための光カチオン重合開始剤、熱線照射によって重合させるための熱カチオン重合開始剤）や、更に他の添加剤（増感剤等）を添加して、塗布用のエポキシ樹脂組成物を調製して使用することができる。 As the epoxy resin, for example, a hydrogenated epoxy resin, an alicyclic epoxy resin, an aliphatic epoxy resin and the like are preferable. For epoxy resins, polymerization initiators (for example, photocationic polymerization initiators for polymerization by UV irradiation, thermal cationic polymerization initiators for polymerization by heat ray irradiation), and other additives (sensitizers, etc.) Can be added to prepare an epoxy resin composition for coating.
　また、接着剤としては、アクリルアミド、アクリレート、ウレタンアクリレート、エポキシアクリレート等のアクリル系樹脂や、ポリビニルアルコール系の水系接着剤を使用することもできる。 Also, as the adhesive, acrylic resins such as acrylamide, acrylate, urethane acrylate, and epoxy acrylate, and polyvinyl alcohol-based aqueous adhesives can be used.
　偏光板１Ａは、例えば液晶セル等の表示用セル（画像表示素子）の片面又は両面に貼合されるものである。偏光板１Ａは、保護フィルム３上に積層される他の光学層を更に含むことができる。他の光学層としては、ある種の偏光を透過し、それと逆の性質を示す偏光を反射する反射型偏光フィルム；表面に凹凸形状を有する防眩機能付フィルム；表面反射防止機能付フィルム；表面に反射機能を有する反射フィルム；反射機能と透過機能とを併せ持つ半透過反射フィルム；視野角補償フィルム等が挙げられる。 The polarizing plate 1A is bonded to one side or both sides of a display cell (image display element) such as a liquid crystal cell. The polarizing plate 1 </ b> A can further include another optical layer laminated on the protective film 3. As another optical layer, a reflective polarizing film that transmits a certain kind of polarized light and reflects polarized light having the opposite properties; a film with an antiglare function having an uneven surface; a film with a surface antireflection function; surface A reflective film having a reflective function; a transflective film having both a reflective function and a transmissive function; and a viewing angle compensation film.
　偏光子２と保護フィルム３，３との三層からなる偏光板１Ａの厚さは、１０～５００μｍであることが好ましく、１０～３００μｍであることがより好ましく、１０～２００μｍであることが更に好ましい。 The thickness of the polarizing plate 1A comprising three layers of the polarizer 2 and the protective films 3 and 3 is preferably 10 to 500 μm, more preferably 10 to 300 μm, and further preferably 10 to 200 μm. preferable.
　偏光板１Ａは、例えば以下のようにして製造することができる。まず、保護フィルム３を構成する材料からなる長尺のフィルムロールから、二枚の保護フィルム３，３を長方形に切り出す。切り出す長方形の大きさや縦横比は、偏光板１Ａの適用対象に応じて決めたものとする。一方の保護フィルム（第１の保護フィルム）３の片面に接着剤を塗布する。接着剤を塗布する領域は保護フィルム３の全面ではなく、フィルム状の偏光子２が積層される領域とする。 The polarizing plate 1A can be manufactured as follows, for example. First, two protective films 3 and 3 are cut out into a rectangle from a long film roll made of a material constituting the protective film 3. The size and aspect ratio of the rectangle to be cut out are determined according to the application target of the polarizing plate 1A. An adhesive is applied to one side of one protective film (first protective film) 3. The region where the adhesive is applied is not the entire surface of the protective film 3, but the region where the film-like polarizer 2 is laminated.
　次に、偏光子２を構成する材料からなる長尺のフィルムロールから、偏光子２を長方形に切り出す。切り出す長方形の大きさは、保護フィルム３の大きさよりも小さくする。小さくする分量としては、偏光子２の端部２ａを保護フィルム３の端部３ａよりも内側に凹ませたい分とする。切り出したフィルム状の偏光子２を、接着剤を塗布した保護フィルム３の面に積層する。ここでの積層は、偏光子２の片面の全面が保護フィルム３の面の内側に入るように行う。ここで保護フィルム３側から見れば、偏光子２は保護フィルムに覆われている。接着剤として活性エネルギー線硬化性樹脂を用いた場合は、ここで活性エネルギー線を照射して接着剤を硬化させる。 Next, the polarizer 2 is cut into a rectangle from a long film roll made of the material constituting the polarizer 2. The size of the rectangle to be cut out is smaller than the size of the protective film 3. As an amount to be reduced, it is assumed that the end 2a of the polarizer 2 is to be recessed inwardly of the end 3a of the protective film 3. The cut-out film-like polarizer 2 is laminated on the surface of the protective film 3 coated with an adhesive. The lamination here is performed so that the entire surface of one side of the polarizer 2 enters the inside of the surface of the protective film 3. Here, when viewed from the protective film 3 side, the polarizer 2 is covered with the protective film. When an active energy ray-curable resin is used as the adhesive, the adhesive is cured by irradiating active energy rays here.
　次に、偏光子の他方の片面の全面に、接着剤を塗布し、残る一枚の保護フィルム（第２の保護フィルム）３を積層する。ここでの保護フィルム３の積層は、保護フィルム３の面によって偏光子２の片面の全面が覆われるように行う。接着剤として活性エネルギー線硬化性樹脂を用いた場合は、ここでも活性エネルギー線を照射して接着剤を硬化させる。 Next, an adhesive is applied to the entire surface of the other side of the polarizer, and the remaining protective film (second protective film) 3 is laminated. Lamination | stacking of the protective film 3 here is performed so that the whole surface of the single side | surface of the polarizer 2 may be covered with the surface of the protective film 3. FIG. When the active energy ray-curable resin is used as the adhesive, the active energy ray is irradiated here to cure the adhesive.
　以上の手順によって、偏光板１Ａが製造される。 The polarizing plate 1A is manufactured by the above procedure.
　以上に説明した偏光板１Ａは、偏光子２の端部２ａが保護フィルム３の端部３ａよりも内側に位置しているため、偏光子２の端部が物理的に保護される。従って、偏光板１Ａを例えば液晶セルに貼り付ける場合のようなハンドリングにおいて、偏光板１Ａの側面が衝撃を受けた場合に、保護フィルム３の端部３ａのみが衝撃を受けることとなり、偏光子２の端部に傷やクラックが生じることが防止される。この効果は、偏光板１Ａを液晶セル等に貼り付けた後の更なるハンドリングにおいても奏される。また、偏光板１Ａのヒートショック試験の耐久性向上にも資する。 In the polarizing plate 1A described above, since the end 2a of the polarizer 2 is located inside the end 3a of the protective film 3, the end of the polarizer 2 is physically protected. Accordingly, in handling such as when the polarizing plate 1A is attached to a liquid crystal cell, for example, when the side surface of the polarizing plate 1A receives an impact, only the end portion 3a of the protective film 3 receives the impact, and the polarizer 2 Scratches and cracks are prevented from occurring at the ends of the. This effect is also exhibited in further handling after the polarizing plate 1A is attached to a liquid crystal cell or the like. Moreover, it contributes to the durability improvement of the heat shock test of the polarizing plate 1A.
　また、偏光板１Ａは、偏光子２の両面に積層された保護フィルム３，３の端部３ａ，３ａによって偏光子２の端部２ａが保護されているため、特に近年の液晶セルの狭額縁化傾向において、その効果が良好に奏される。すなわち、偏光板１Ａが貼着された液晶セルの額縁が通常幅である場合は、偏光子２に物理的衝撃が加わることを液晶セル自体が保護する働きがあるが、液晶セルが狭額縁であると、その保護の効果が小さくなる。この場合、液晶セル側の保護フィルム３の端部３ａが偏光子２の端部２ａの保護に寄与する割合が大きくなる。 Further, the polarizing plate 1 </ b> A has an end portion 2 a of the polarizer 2 protected by the end portions 3 a and 3 a of the protective films 3 and 3 laminated on both surfaces of the polarizer 2. The effect is favorably exhibited in the tendency to change. That is, when the frame of the liquid crystal cell to which the polarizing plate 1A is attached has a normal width, the liquid crystal cell itself has a function of protecting the polarizer 2 from physical shock, but the liquid crystal cell has a narrow frame. If it exists, the effect of the protection becomes small. In this case, the ratio that the end 3a of the protective film 3 on the liquid crystal cell side contributes to the protection of the end 2a of the polarizer 2 is increased.
　偏光子２の端部２ａは全周に亘って保護フィルム３の端部３ａよりも内側にあるため、上記の効果は、偏光板１Ａの全周に亘って奏される。 Since the end 2a of the polarizer 2 is located on the inner side of the end 3a of the protective film 3 over the entire circumference, the above effect is exhibited over the entire circumference of the polarizing plate 1A.
　また、偏光板１Ａは平面視長方形であるため、液晶表示装置等、種々の物品に適用しやすい。 Further, since the polarizing plate 1A has a rectangular shape in plan view, it can be easily applied to various articles such as a liquid crystal display device.
＜第２の実施形態＞
　本発明の偏光板は、図３に示されているとおり、偏光子２及び保護フィルム３の積層体に対して、セパレータ４や仮保護フィルム６が更に積層されていてもよい。 <Second Embodiment>
In the polarizing plate of the present invention, as shown in FIG. 3, a separator 4 and a temporary protective film 6 may be further laminated on a laminate of the polarizer 2 and the protective film 3.
　第２の実施形態の偏光板１Ｂは、第１の実施形態の偏光板１Ａの片面に（すなわち一方の保護フィルム３のうち偏光子２が積層されていない面に）、粘着剤層５を介してセパレータ４が積層されている。また、偏光板１Ａの他方の面に（すなわち他方の保護フィルム３のうち偏光子２が積層されていない面に）、仮保護フィルム６が積層されている。 The polarizing plate 1 </ b> B of the second embodiment is disposed on one side of the polarizing plate 1 </ b> A of the first embodiment (that is, on the surface of the one protective film 3 on which the polarizer 2 is not laminated) via the pressure-sensitive adhesive layer 5. The separator 4 is laminated. A temporary protective film 6 is laminated on the other surface of the polarizing plate 1A (that is, on the surface of the other protective film 3 on which the polarizer 2 is not laminated).
　粘着剤層５は、偏光板１Ｂを他の物品（例えば液晶セル）に貼着させるときに機能する層である。粘着剤層５は、アクリル系樹脂や、シリコーン系樹脂、ポリエステル、ポリウレタン、ポリエーテル等で構成することができる。 The pressure-sensitive adhesive layer 5 is a layer that functions when the polarizing plate 1B is attached to another article (for example, a liquid crystal cell). The pressure-sensitive adhesive layer 5 can be composed of acrylic resin, silicone resin, polyester, polyurethane, polyether, or the like.
　粘着剤層５の厚さは、２～５００μｍであることが好ましく、２～２００μｍであることがより好ましく、２～５０μｍであることが更に好ましい。 The thickness of the pressure-sensitive adhesive layer 5 is preferably 2 to 500 μm, more preferably 2 to 200 μm, still more preferably 2 to 50 μm.
　粘着剤層５を保護フィルム３に積層する方法としては、例えば、保護フィルム３に上記樹脂や任意の添加成分を含む溶液を塗布する方法でもよく、セパレータ４上に当該溶液で粘着剤層５を形成した後に保護フィルム３に積層する方法でもよい。粘着剤層５の端部５ａは、全周に亘って保護フィルム３の端部３ａと位置が揃っていることが好ましい。 As a method of laminating the pressure-sensitive adhesive layer 5 on the protective film 3, for example, a method of applying a solution containing the resin or any additive component to the protective film 3 may be used. After forming, the method of laminating | stacking on the protective film 3 may be used. The end 5a of the pressure-sensitive adhesive layer 5 is preferably aligned with the end 3a of the protective film 3 over the entire circumference.
　セパレータ４は、粘着剤層５の保護や異物の付着防止等を目的として貼着される剥離可能なフィルムであって、偏光板１Ｂの使用時に剥がされて粘着剤層５が露出される。セパレータ４は、例えばポリエチレンのようなポリエチレン系樹脂、ポリプロピレンのようなポリプロピレン系樹脂、ポリエチレンテレフタレートのようなポリエステル系樹脂等で構成することができる。中でも、ポリエチレンテレフタレートの延伸フィルムが好ましい。 The separator 4 is a peelable film that is stuck for the purpose of protecting the pressure-sensitive adhesive layer 5 and preventing adhesion of foreign matters, and is peeled off when the polarizing plate 1B is used to expose the pressure-sensitive adhesive layer 5. The separator 4 can be made of, for example, a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester resin such as polyethylene terephthalate, or the like. Among these, a stretched film of polyethylene terephthalate is preferable.
　セパレータ４の端部４ａは、全周に亘って粘着剤層５の端部５ａと位置が揃っていることが好ましい。また、セパレータ４は、偏光板１Ｂの使用時に容易に剥がすことができるように、粘着剤層５に接する面にシリコーン樹脂等による離型処理を施してもよい。 The end 4a of the separator 4 is preferably aligned with the end 5a of the adhesive layer 5 over the entire circumference. Further, the separator 4 may be subjected to a release treatment with a silicone resin or the like on the surface in contact with the pressure-sensitive adhesive layer 5 so that the separator 4 can be easily peeled off when the polarizing plate 1B is used.
　セパレータ４の厚さは、５～２００μｍであることが好ましく、５～１５０μｍであることがより好ましく、５～１００μｍであることが更に好ましい。 The thickness of the separator 4 is preferably 5 to 200 μm, more preferably 5 to 150 μm, still more preferably 5 to 100 μm.
　仮保護フィルム６は、剥離可能なフィルムであり、仮保護フィルム６を積層した保護フィルム３の表面を損傷、摩損等から保護するためのフィルムである。仮保護フィルム６の材料としては、保護フィルム３と同様のものを用いることができ、なかでもポリエチレンテレフタレート、ポリエチレンナフタレート、ポリエチレンイソフタレート、ポリブチレンテレフタレート等のポリエステル系樹脂が好ましい。 The temporary protective film 6 is a peelable film and is a film for protecting the surface of the protective film 3 on which the temporary protective film 6 is laminated from being damaged or worn. As the material of the temporary protective film 6, the same material as that of the protective film 3 can be used, and polyester resins such as polyethylene terephthalate, polyethylene naphthalate, polyethylene isophthalate, and polybutylene terephthalate are particularly preferable.
　仮保護フィルム６は、基材となるフィルムの他に、このフィルムの表面に積層された弱い接着性を有する粘着剤層を有していてもよい。仮保護フィルム６は、保護フィルム３に積層された後、偏光板１Ｂの使用時まで保護フィルム３に貼合されており、使用時において保護フィルム３から剥離される。仮保護フィルム６の端部６ａは、全周に亘って保護フィルム３の端部３ａと位置が揃っていることが好ましい。 The temporary protective film 6 may have a pressure-sensitive adhesive layer having weak adhesion laminated on the surface of the film in addition to the film serving as the base material. The temporary protective film 6 is laminated on the protective film 3 and then bonded to the protective film 3 until the polarizing plate 1B is used. The temporary protective film 6 is peeled off from the protective film 3 when used. The end 6a of the temporary protective film 6 is preferably aligned with the end 3a of the protective film 3 over the entire circumference.
　仮保護フィルム６の厚さは、５～２００μｍであることが好ましく、５～１５０μｍであることがより好ましく、５～１００μｍであることが更に好ましい。 The thickness of the temporary protective film 6 is preferably 5 to 200 μm, more preferably 5 to 150 μm, and still more preferably 5 to 100 μm.
　偏光板１Ｂによれば、保護フィルム３が損傷、摩損することが防止されるとともに、偏光板１Ｂの使用時にはセパレータ４を剥がして粘着剤層５を露出させ、その粘着力によって偏光板１Ｂを他の物品、例えば液晶セル、有機ＥＬデバイスに貼着して、画像表示装置を構成することができる。 According to the polarizing plate 1B, the protective film 3 is prevented from being damaged or worn, and when the polarizing plate 1B is used, the separator 4 is peeled off to expose the adhesive layer 5, and the polarizing plate 1B is removed by the adhesive force. An image display device can be configured by sticking to an article such as a liquid crystal cell or an organic EL device.
　液晶セルを例にすると、図４に示されているとおり、例えばセパレータ４を剥がした偏光板１Ｂを液晶セル８の両面に貼着して液晶パネル９を構成し、これにバックライト（面光源装置；図示省略）その他の部材を組み合わせることで、液晶表示装置１０を作製することができる。他方、仮保護フィルム６を剥がして露出した面にはタッチパネル等を設けることができる。 Taking a liquid crystal cell as an example, as shown in FIG. 4, for example, a polarizing plate 1 </ b> B with a separator 4 peeled off is adhered to both surfaces of a liquid crystal cell 8 to form a liquid crystal panel 9. Device; not shown) The liquid crystal display device 10 can be manufactured by combining other members. On the other hand, a touch panel or the like can be provided on the surface exposed by peeling off the temporary protective film 6.
　以上、本発明の好適な実施形態について説明したが、本発明は上記実施形態に何ら限定されるものではない。例えば、上記実施形態では偏光子２の端部２ａがその全周に亘って両方の保護フィルム３，３の端部３ａ，３ａよりも内側に位置している態様を示したが、内側に位置する部分が偏光子２の全周に亘っていなくてもよい。この場合、偏光子２の端部２ａは、保護フィルム３，３の端部３ａ，３ａよりも内側に位置している部分のみが保護される。 The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, although the end part 2a of the polarizer 2 showed the aspect located inside the edge part 3a, 3a of both the protective films 3 and 3 over the perimeter in the said embodiment, it is located inside. The part to perform does not need to cover the whole periphery of the polarizer 2. In this case, the end 2a of the polarizer 2 is protected only at the portion located on the inner side of the ends 3a and 3a of the protective films 3 and 3.
　また、上記実施形態では偏光子２の全周に亘って同じ長さで内側に位置している様子を示したが、場所によって偏光子２の凹みの程度を変えてもよい。例えば、偏光板のハンドリング時に衝撃を受けやすい部分があらかじめ分かっている場合は、その部分の偏光子の端部の凹み幅を大きくしておくことが好ましい。 In the above embodiment, the entire length of the polarizer 2 is shown to be located on the inner side with the same length. However, the degree of the depression of the polarizer 2 may be changed depending on the location. For example, when a portion that is susceptible to impact during handling of the polarizing plate is known in advance, it is preferable to increase the recess width of the end portion of the polarizer at that portion.
　また、片方の保護フィルム３は、偏光子２と同形状であってもよい。すなわち、片方の保護フィルム３の端部３ａは、偏光子２の端部２ａと位置が揃っていてもよい。 Also, the one protective film 3 may have the same shape as the polarizer 2. That is, the end 3 a of one protective film 3 may be aligned with the end 2 a of the polarizer 2.
　また、上記実施形態では偏光板１Ａ，１Ｂが平面視長方形である例を示したが、他の四角形、例えば台形、平行四辺形、正方形等であってもよいほか、円形や楕円形であってもよい。すなわち偏光板１Ａ，１Ｂは、偏光板１Ａ，１Ｂを貼着する物品の形状に合わせて任意の形状とすることができ、特に、平面視形状が、偏光板１Ａ，１Ｂを貼着する領域の形状に一致する形状であってもよい。 Moreover, although the polarizing plate 1A, 1B showed the example which is planar view rectangle in the said embodiment, other squares, for example, a trapezoid, a parallelogram, a square, etc. may be sufficient, and it may be circular or elliptical. Also good. That is, the polarizing plates 1A and 1B can have any shape according to the shape of the article to which the polarizing plates 1A and 1B are attached. In particular, the shape in plan view is the region where the polarizing plates 1A and 1B are attached. The shape may match the shape.
　１Ａ，１Ｂ…偏光板、２…偏光子、２ａ…偏光子の端部、３…保護フィルム、３ａ…保護フィルムの端部、４…セパレータ、４ａ…セパレータの端部、５…粘着剤層、５ａ…粘着剤層の端部、６…仮保護フィルム、６ａ…仮保護フィルムの端部、８…液晶セル、９…液晶パネル、１０…液晶表示装置（画像表示装置）。 DESCRIPTION OF SYMBOLS 1A, 1B ... Polarizing plate, 2 ... Polarizer, 2a ... End of polarizer, 3 ... Protective film, 3a ... End of protective film, 4 ... Separator, 4a ... End of separator, 5 ... Adhesive layer, 5a ... end of pressure-sensitive adhesive layer, 6 ... temporary protective film, 6a ... end of temporary protective film, 8 ... liquid crystal cell, 9 ... liquid crystal panel, 10 ... liquid crystal display device (image display device).

Claims (8)

  1. 　偏光子と、その両面に積層された保護フィルムと、を備え、
    　前記保護フィルムは、いずれも所定の形状に成形されたものであり、
    　前記保護フィルムは、それぞれ前記偏光子の片面の全面に積層されており、
    　前記偏光子の少なくとも一部の端部が、少なくとも一方の前記保護フィルムの端部よりも内側に位置している、偏光板。     A polarizer and a protective film laminated on both sides thereof,
    Each of the protective films is formed into a predetermined shape,
    Each of the protective films is laminated on the entire surface of one side of the polarizer,
    The polarizing plate in which the edge part of at least one part of the said polarizer is located inside the edge part of at least one said protective film.
  2. 　前記偏光子の少なくとも一部の端部が、両方の前記保護フィルムの端部よりも内側に位置している、請求項１記載の偏光板。 The polarizing plate according to claim 1, wherein at least a part of the end portions of the polarizer are located inside the end portions of both of the protective films.
  3. 　前記偏光子の全ての端部が、少なくとも一方の前記保護フィルムの端部よりも内側に位置している、請求項１又は２記載の偏光板。 The polarizing plate according to claim 1 or 2, wherein all end portions of the polarizer are located on an inner side than an end portion of at least one of the protective films.
  4. 　平面視形状が、当該偏光板を貼着する領域の形状に一致する形状である、請求項１～３のいずれか一項記載の偏光板。 The polarizing plate according to any one of claims 1 to 3, wherein a shape in plan view matches a shape of a region where the polarizing plate is attached.
  5. 　平面視四角形である、請求項１～４のいずれか一項記載の偏光板。 The polarizing plate according to any one of claims 1 to 4, wherein the polarizing plate has a square shape in plan view.
  6. 　いずれかの前記保護フィルムの前記偏光子が積層されていない側に、粘着剤層を介してセパレータが積層されており、
    　他方の前記保護フィルムの前記偏光子が積層されていない側に、仮保護フィルムが積層されている、請求項１～５のいずれか一項記載の偏光板。     A separator is laminated via an adhesive layer on the side of the protective film where the polarizer is not laminated,
    The polarizing plate according to any one of claims 1 to 5, wherein a temporary protective film is laminated on a side of the other protective film on which the polarizer is not laminated.
  7. 　請求項１～５のいずれか一項記載の偏光板を備える画像表示装置。 An image display device comprising the polarizing plate according to any one of claims 1 to 5.
  8. 　所定の形状に成形された第１の保護フィルムに、片面の全面が前記第１の保護フィルムに覆われるように偏光子を積層し、
    　前記偏光子に、前記偏光子の他方の片面の全面を覆うように第２の保護フィルムを積層する、偏光板の製造方法であって、
    　前記偏光子が前記第１の保護フィルム及び前記第２の保護フィルムの少なくとも一方の保護フィルムの少なくとも一部の端部よりも内側に位置するように、前記第１の保護フィルム、前記偏光子、及び前記第２の保護フィルムを積層する、偏光板の製造方法。     Laminating a polarizer so that the entire surface of one side is covered with the first protective film, the first protective film molded in a predetermined shape,
    A method for producing a polarizing plate, wherein a second protective film is laminated on the polarizer so as to cover the entire surface of the other side of the polarizer.
    The first protective film, the polarizer, and so that the polarizer is positioned on the inner side of at least a part of at least one of the first protective film and the second protective film. And the manufacturing method of a polarizing plate which laminates | stacks the said 2nd protective film.
PCT/JP2015/083266 2015-08-10 2015-11-26 Polarizing plate, image display device, and method for manufacturing polarizing plate WO2017026078A1 (en)

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JP2016553482A JP6279093B2 (en) 2015-08-10 2016-08-05 Polarizing plate, image display device, and manufacturing method of polarizing plate
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