WO2018016290A1 - 枚葉状の光学フィルム - Google Patents

枚葉状の光学フィルム Download PDF

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Publication number
WO2018016290A1
WO2018016290A1 PCT/JP2017/023959 JP2017023959W WO2018016290A1 WO 2018016290 A1 WO2018016290 A1 WO 2018016290A1 JP 2017023959 W JP2017023959 W JP 2017023959W WO 2018016290 A1 WO2018016290 A1 WO 2018016290A1
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WIPO (PCT)
Prior art keywords
film
optical
sheet
surface protective
adhesive layer
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PCT/JP2017/023959
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English (en)
French (fr)
Japanese (ja)
Inventor
友徳 上野
健太郎 池嶋
聡司 三田
岸　敦史
菁▲王番▼ 徐
恵美 宮井
Original Assignee
日東電工株式会社
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Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to CN201780045224.6A priority Critical patent/CN109477928B/zh
Priority to KR1020197004832A priority patent/KR102356930B1/ko
Publication of WO2018016290A1 publication Critical patent/WO2018016290A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • 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
    • B32B7/022—Mechanical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/06—Interconnection of layers permitting easy separation
    • 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
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • 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
    • 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
    • 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
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • 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

Definitions

  • the present invention relates to a sheet-like optical film, for example, a sheet-like optical film used in sheet-to-panel manufacturing equipment.
  • An optical film in which a release film, an adhesive layer, an optical functional film (typically, a polarizing film) and a surface protective film are laminated in this order is formed in a roll shape.
  • An optical film obtained by cutting the optical film fed from the roll-shaped optical film by cutting the adhesive layer, the optical functional film and the surface protective film in the width direction (half cut) while leaving the release film. (Hereinafter also referred to as “roll-to-panel method”) in which the release film is peeled off and the optical film is bonded to the optical cell through the exposed adhesive layer (for example, Patent Documents 1 and 2). reference).
  • an optical film bonding method different from the roll-to-panel method an optical film that has been in a single wafer state is pasted to an optical cell via an adhesive layer that is exposed by peeling the release film.
  • sheet-to-panel method a method of matching (hereinafter also referred to as “sheet-to-panel method”) (see, for example, Patent Document 3).
  • Patent Document 2 discloses that an optical display panel is continuously manufactured using a roll-to-panel method, and a rework process is performed on the optical display panel determined to be defective.
  • a sheet-to-panel method when a new optical functional film is bonded to the optical cell in the rework process.
  • the roll-to-panel method cannot cover all supply amounts, and the sheet-to-panel method is used together. Is also possible.
  • optical functional films for example, polarizing films having a thickness of 60 ⁇ m or less
  • Such a thin optical functional film has a low waist (elastic modulus) and is likely to be twisted or curled.
  • a thin optical functional film is transported to a bonding position in a state of being laminated on a carrier film (release film), and the optical function from the carrier film (release film) at the bonding position. Since the film is peeled off and the optical functional film is bonded to the optical cell, a thin optical functional film can be continuously bonded to the optical cell while suppressing the occurrence of twisting and curling.
  • handling such as transporting the optical functional film in a single wafer state, peeling of the release film, and laminating processing of the optical functional film to the liquid crystal cell is difficult, resulting in poor bonding. There is concern about a drop in yield.
  • the present invention is a sheet capable of suitably producing an optical display panel having the same configuration even when a roll-to-panel method and a sheet-to-panel method are used together when a thin optical functional film is bonded to an optical cell.
  • An object is to provide a leaf-like optical film.
  • the present invention is a sheet-like optical film in which a release film, an adhesive layer, an optical functional film, a first surface protective film and a second surface protective film are laminated in this order,
  • the magnitude relationship of the peeling force between each layer in the sheet-like optical film is Delamination force A between the release film and the adhesive layer, Delamination force B between the adhesive layer and the optical functional film, Delamination force C between the optical functional film and the first surface protective film,
  • the delamination force D between the first surface protective film and the second surface protective film A ⁇ B, A ⁇ C, A ⁇ D.
  • the magnitude relationship of the peeling force is preferably A ⁇ D ⁇ C ⁇ B or A ⁇ D ⁇ B ⁇ C, and more preferably A ⁇ D ⁇ C ⁇ B.
  • the optical functional film may be a polarizing film.
  • the polarizing film may have a thickness of 60 ⁇ m or less.
  • the polarizing film may have a polarizer having a thickness of 10 ⁇ m or less.
  • the first surface protective film may have a first base film and a first pressure-sensitive adhesive layer, and may be laminated on the optical functional film via the first pressure-sensitive adhesive layer.
  • the first surface protective film may be a self-adhesive film.
  • the second surface protective film may have a second base film and a second pressure-sensitive adhesive layer, and may be laminated on the first surface protective film via the second pressure-sensitive adhesive layer.
  • the second surface protective film may be a self-adhesive film.
  • the sheet-like optical film of the present invention is used in a sheet-to-panel system. Since the sheet-like optical film provided with the second surface protective film has improved handling properties, the sheet-to-panel method can be used while suppressing the occurrence of twisting and curling. It can be suitably bonded to the cell. And by removing (for example, peeling) the second surface protective film from the sheet-like optical film bonded to the optical display panel, as a result, the same as the optical display panel manufactured by the roll-to-panel method A laminated optical display panel can be manufactured. That is, according to the sheet-like optical film of the present invention, when the optical film is bonded to the optical cell, even when the roll-to-panel method and the sheet-to-panel method are used in combination, A display panel can be suitably manufactured.
  • FIG. 1 is a schematic view showing a sheet-like optical film and a roll-like optical film.
  • the side surface, plane, and partial cross-sectional enlarged view of the roll-shaped first optical film 1 are shown in the upper part of FIG.
  • the side surface, plane, and partial cross-sectional enlarged view of the sheet-like first optical film 2 are shown in the lower part of FIG.
  • a first release film 11 a first pressure-sensitive adhesive layer 12, a first optical functional film 13, and a first surface protective film 14 are laminated in this order.
  • the roll-shaped first optical film 1 is used for manufacturing an optical display panel by a roll-to-panel method.
  • the strip-shaped first optical film 10 having a width a that is fed out from the roll-shaped first optical film 1 is cut by the cutting means C leaving the release film 11 at a predetermined interval b.
  • Reference numeral s denotes a cut formed in the first optical film 10 by the above cutting.
  • the sheet-like first optical film 2 includes a first release film 21, a first pressure-sensitive adhesive layer 22, a first optical functional film 23, a first surface protective film 24, and a second surface protective film 25 laminated in this order.
  • the size of the sheet-like first optical film 2 is vertical a and horizontal b.
  • the sheet-like first optical film 2 is used for manufacturing an optical display panel by a sheet-to-panel method.
  • the first release film 11 and the first release film 21 have the same configuration.
  • the 1st adhesive layer 12 and the 1st adhesive layer 22 are the same structures.
  • the first optical functional film 13 and the first optical functional film 23 have the same configuration.
  • the 1st surface protection film 14, the 1st surface protection film 24, and the 2nd surface protection film 25 are the same structures.
  • the “same configuration” is not limited as long as the materials, thicknesses, and the like completely match, but may be substantially the same (for example, the same in terms of manufacturing quality).
  • the first surface protective film 14 has a first base film and a first pressure-sensitive adhesive layer, and the first optical functional film 13 (or 23) via the first pressure-sensitive adhesive layer. ).
  • the first surface protective film 14 (or 24) may be a self-adhesive film.
  • the second surface protective film 25 has a second base film and a second pressure-sensitive adhesive layer, and is laminated on the first surface protective film 24 via the second pressure-sensitive adhesive layer.
  • the second surface protective film 25 may be a self-adhesive film.
  • the peeling force between the first surface protective film 24 and the first optical functional film 23 is larger than the peeling force between the second surface protective film 25 and the first surface protective film 24. According to this, the 2nd surface protection film 25 can be peeled more smoothly.
  • a tensile tester can be used as the measurement of the peeling force. The peeling condition is measured by 180 ° peeling at 0.3 m / min. The peeling force is controlled by the composition and thickness of the pressure-sensitive adhesive.
  • the magnitude relationship of the peeling force between each layer in the sheet-like 1st optical film 2 is as follows. Delamination force A between the first release film 21 and the first pressure-sensitive adhesive layer 22; Delamination force B between the first pressure-sensitive adhesive layer 22 and the first optical functional film 23, Delamination force C between the first optical functional film 23 and the first surface protective film 24; In the case of the delamination force D between the first surface protective film 24 and the second surface protective film 25, A ⁇ B, A ⁇ C, A ⁇ D.
  • the second surface protective film can be prevented from peeling off when the first release film is peeled off.
  • the first optical functional films 13 and 23 are not particularly limited as long as they are films having optical functions, and examples thereof include a polarizing film, a retardation film, a brightness enhancement film, and a diffusion film, but are typically polarizing films. .
  • a polarizing film having a thickness (total thickness) of 60 ⁇ m or less, more preferably 55 ⁇ m or less, and further preferably 50 ⁇ m or less.
  • a polarizing film for example, (1) a configuration in which protective films (sometimes referred to as “polarizer protective films”) are laminated on both sides of a polarizer (sometimes referred to as “both protective polarizing films”). (2) A structure in which a protective film is laminated only on one side of a polarizer (sometimes referred to as a “single protective polarizing film”).
  • Polarizer A polarizer using a polyvinyl alcohol-based resin is used.
  • polarizers include dichroic iodine and dichroic dyes on hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and ethylene / vinyl acetate copolymer partially saponified films.
  • hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and ethylene / vinyl acetate copolymer partially saponified films.
  • examples thereof include polyene-based oriented films such as those obtained by adsorbing substances and uniaxially stretched, polyvinyl alcohol dehydrated products and polyvinyl chloride dehydrochlorinated products.
  • a polarizer composed of a polyvinyl alcohol film and a dichroic material such as iodine is preferable.
  • a polarizer obtained by dyeing a polyvinyl alcohol film with iodine and uniaxially stretching it can be produced, for example, by dyeing polyvinyl alcohol in an aqueous iodine solution and stretching it 3 to 7 times the original length. If necessary, it may contain boric acid, zinc sulfate, zinc chloride, or the like, or may be immersed in an aqueous solution such as potassium iodide. Further, if necessary, the polyvinyl alcohol film may be immersed in water and washed before dyeing.
  • Stretching may be performed after dyeing with iodine, may be performed while dyeing, or may be dyed with iodine after stretching.
  • the film can be stretched even in an aqueous solution such as boric acid or potassium iodide or in a water bath.
  • the thickness of the polarizer is preferably 10 ⁇ m or less from the viewpoint of thinning, more preferably 8 ⁇ m or less, further 7 ⁇ m or less, and further preferably 6 ⁇ m or less.
  • the thickness of the polarizer is preferably 2 ⁇ m or more, and more preferably 3 ⁇ m or more.
  • Such a thin polarizer has less thickness unevenness, excellent visibility, and less dimensional change, and therefore excellent durability against thermal shock.
  • a polarizing film including a polarizer having a thickness of 10 ⁇ m or less has a significantly low waist (elastic modulus), and therefore, there is a high possibility of twisting and curling in the sheet-to-panel system. Therefore, the present invention is particularly suitable for the polarizing film.
  • Patent No. 4751486 Japanese Patent No. 4751481, Patent No. 4815544, Patent No. 5048120, International Publication No. 2014/077599 pamphlet, International Publication No. 2014/077636 Pamphlet, And the thin polarizers obtained from the production methods described therein.
  • the polarizer has an optical characteristic expressed by a single transmittance T and a polarization degree P of the following formula: P> ⁇ (10 0.929 T ⁇ 42.4 ⁇ 1) ⁇ 100 (where T ⁇ 42.3) Or P ⁇ 99.9 (however, T ⁇ 42.3) It is preferable to be configured to satisfy the above condition.
  • a polarizer configured so as to satisfy the above-described conditions uniquely has performance required as a display for a liquid crystal television using a large display element. Specifically, the contrast ratio is 1000: 1 or more and the maximum luminance is 500 cd / m 2 or more. As other uses, for example, it is bonded to the viewing side of the organic EL cell.
  • Patent No. 4751486, Patent in that it can be stretched at a high magnification and the polarization performance can be improved.
  • stretching in a boric-acid aqueous solution as described in the 4751481 specification and the patent 4815544 specification is preferable, and it describes especially in the patent 4751481 specification and the patent 4815544 specification.
  • stretching in the boric-acid aqueous solution which has this is preferable.
  • These thin polarizers can be obtained by a production method including a step of stretching a polyvinyl alcohol-based resin (hereinafter also referred to as PVA-based resin) layer and a stretching resin base material in a laminated state and a step of dyeing.
  • PVA-based resin polyvinyl alcohol-based resin
  • a stretching resin base material in a laminated state
  • dyeing a step of dyeing
  • polarizer protective film As a material constituting the protective film, a material excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy and the like is preferable.
  • polyester polymers such as polyethylene terephthalate and polyethylene naphthalate
  • cellulose polymers such as diacetyl cellulose and triacetyl cellulose
  • acrylic polymers such as polymethyl methacrylate
  • styrene such as polystyrene and acrylonitrile / styrene copolymer (AS resin)
  • AS resin acrylonitrile / styrene copolymer
  • polyethylene, polypropylene, polyolefins having a cyclo or norbornene structure, polyolefin polymers such as ethylene / propylene copolymers, vinyl chloride polymers, amide polymers such as nylon and aromatic polyamide, imide polymers, sulfone polymers , Polyether sulfone polymer, polyether ether ketone polymer, polyphenylene sulfide polymer, vinyl alcohol polymer, vinylidene chloride polymer, vinyl butyral polymer, arylate polymer, polyoxymethylene polymer, epoxy polymer, or the above Polymer blends and the like can also be mentioned as examples of the polymer forming the protective film.
  • thermoplastic resin in the transparent protective film is preferably 50 to 100% by weight, more preferably 50 to 99% by weight, still more preferably 60 to 98% by weight, and particularly preferably 70 to 97% by weight. .
  • content of the said thermoplastic resin in a transparent protective film is 50 weight% or less, there exists a possibility that the high transparency etc. which a thermoplastic resin originally has cannot fully be expressed.
  • a retardation film As the protective film, a retardation film, a brightness enhancement film, a diffusion film, and the like can also be used.
  • a functional layer such as a hard coat layer, an antireflection layer, an antisticking layer, a diffusion layer or an antiglare layer can be provided on the surface of the protective film where the polarizer is not adhered.
  • the functional layers such as the hard coat layer, antireflection layer, antisticking layer, diffusion layer and antiglare layer can be provided on the transparent protective film itself, and separately provided separately from the transparent protective film. You can also
  • the protective film and the polarizer are laminated via an intervening layer such as an adhesive layer, an adhesive layer, and an undercoat layer (primer layer). At this time, it is desirable that the both are laminated without an air gap by an intervening layer.
  • the adhesive layer is formed of an adhesive.
  • the type of the adhesive is not particularly limited, and various types can be used.
  • the adhesive layer is not particularly limited as long as it is optically transparent. Examples of the adhesive include water-based, solvent-based, hot-melt-based, active energy ray-curable types, and the like. Or an active energy ray hardening-type adhesive agent is suitable.
  • the water-based adhesive examples include an isocyanate-based adhesive, a polyvinyl alcohol-based adhesive, a gelatin-based adhesive, a vinyl-based latex, and a water-based polyester.
  • the water-based adhesive is usually used as an adhesive composed of an aqueous solution, and usually contains 0.5 to 60% by weight of solid content.
  • the active energy ray curable adhesive is an adhesive that cures by an active energy ray such as an electron beam or ultraviolet rays (radical curable type, cationic curable type), for example, in an electron beam curable type or an ultraviolet curable type. Can be used.
  • an active energy ray curable adhesive for example, a photo radical curable adhesive can be used.
  • the photo radical curable active energy ray curable adhesive is used as an ultraviolet curable adhesive, the adhesive contains a radical polymerizable compound and a photo polymerization initiator.
  • an easily bonding layer can be provided between a transparent protective film and an adhesive bond layer.
  • the easy adhesion layer can be formed of, for example, various resins having a polyester skeleton, a polyether skeleton, a polycarbonate skeleton, a polyurethane skeleton, a silicone-based, a polyamide skeleton, a polyimide skeleton, a polyvinyl alcohol skeleton, and the like. These polymer resins can be used alone or in combination of two or more. Moreover, you may add another additive for formation of an easily bonding layer. Specifically, a stabilizer such as a tackifier, an ultraviolet absorber, an antioxidant, and a heat resistance stabilizer may be used.
  • the pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive.
  • Various pressure-sensitive adhesives can be used as the pressure-sensitive adhesive, such as rubber-based pressure-sensitive adhesives, acrylic pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, vinyl alkyl ether-based pressure-sensitive adhesives, polyvinylpyrrolidone-based pressure-sensitive adhesives, Examples include acrylamide-based adhesives and cellulose-based adhesives.
  • An adhesive base polymer is selected according to the type of the adhesive.
  • acrylic pressure-sensitive adhesives are preferably used because they are excellent in optical transparency, exhibit appropriate wettability, cohesiveness, and adhesive pressure-sensitive adhesive properties, and are excellent in weather resistance and heat resistance.
  • the undercoat layer (primer layer) is formed to improve the adhesion between the polarizer and the protective film.
  • the material constituting the primer layer is not particularly limited as long as the material exhibits a certain degree of strong adhesion to both the base film and the polyvinyl alcohol-based resin layer.
  • a thermoplastic resin excellent in transparency, thermal stability, stretchability, etc. is used.
  • the thermoplastic resin include an acrylic resin, a polyolefin resin, a polyester resin, a polyvinyl alcohol resin, or a mixture thereof.
  • a 1st, 2nd surface protection film is provided in the single side
  • a film material having isotropic property or close to isotropic property is selected from the viewpoints of inspection property and manageability.
  • film materials include polyester resins such as polyethylene terephthalate film, cellulose resins, acetate resins, polyether sulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, acrylic resins, and the like.
  • the base film can be used as a laminate of one kind or two or more kinds of film materials, and a stretched product of the film can also be used.
  • the thickness of the base film is preferably 10 ⁇ m to 150 ⁇ m, more preferably 20 to 100 ⁇ m.
  • the base film can be used as a self-adhesive film, and a film having the base film and an adhesive layer can be used.
  • those having an adhesive layer are preferably used from the viewpoint of protecting an optical functional film such as a polarizing film.
  • Examples of the pressure-sensitive adhesive layer used for laminating the first and second surface protective films include (meth) acrylic polymers, silicone polymers, polyesters, polyurethanes, polyamides, polyethers, fluorine-based and rubber-based polymers.
  • a pressure-sensitive adhesive as a base polymer can be appropriately selected and used. From the viewpoints of transparency, weather resistance, heat resistance and the like, an acrylic pressure-sensitive adhesive having an acrylic polymer as a base polymer is preferable.
  • the thickness (dry film thickness) of the pressure-sensitive adhesive layer is determined according to the required adhesive force. Usually, it is about 1 to 100 ⁇ m, preferably 5 to 50 ⁇ m.
  • the first and second surface protective films may be provided with a release treatment layer on the surface opposite to the surface on which the pressure-sensitive adhesive layer is provided with a low adhesive material such as silicone treatment, long-chain alkyl treatment, or fluorine treatment. it can.
  • Adhesives include rubber adhesives, acrylic adhesives, silicone adhesives, urethane adhesives, vinyl alkyl ether adhesives, polyvinyl alcohol adhesives, polyvinyl pyrrolidone adhesives, polyacrylamide adhesives, Examples thereof include cellulose-based pressure-sensitive adhesives.
  • pressure-sensitive adhesives those having excellent optical transparency, suitable wettability, cohesiveness, and adhesive pressure characteristics, and excellent weather resistance and heat resistance are preferably used.
  • An acrylic pressure-sensitive adhesive is preferably used as one exhibiting such characteristics.
  • a release film obtained by removing the pressure-sensitive adhesive (applying to a separator or the like, drying and removing a polymerization solvent or the like to form a pressure-sensitive adhesive layer, and a polarizer) (Or transparent protective film) or a method of applying the pressure-sensitive adhesive to a polarizer (or transparent protective film) and drying and removing the polymerization solvent to form a pressure-sensitive adhesive layer on the polarizer.
  • a release film obtained by removing the pressure-sensitive adhesive (applying to a separator or the like, drying and removing a polymerization solvent or the like to form a pressure-sensitive adhesive layer, and a polarizer) (Or transparent protective film) or a method of applying the pressure-sensitive adhesive to a polarizer (or transparent protective film) and drying and removing the polymerization solvent to form a pressure-sensitive adhesive layer on the polarizer.
  • one or more solvents other than the polymerization solvent may be added as appropriate.
  • a silicone release liner is preferably used as the release film after the release treatment.
  • an appropriate method may be adopted as appropriate according to the purpose.
  • a method of heating and drying the coating film is used.
  • the heating and drying temperature is preferably 40 ° C to 200 ° C, more preferably 50 ° C to 180 ° C, and particularly preferably 70 ° C to 170 ° C. By setting the heating temperature within the above range, an adhesive having excellent adhesive properties can be obtained.
  • the drying time is preferably 5 seconds to 20 minutes, more preferably 5 seconds to 10 minutes, and particularly preferably 10 seconds to 5 minutes.
  • first pressure-sensitive adhesive layers 12 and 22 Various methods are used for forming the first pressure-sensitive adhesive layers 12 and 22. Specifically, for example, roll coat, kiss roll coat, gravure coat, reverse coat, roll brush, spray coat, dip roll coat, bar coat, knife coat, air knife coat, curtain coat, lip coat, die coater, etc. Examples thereof include an extrusion coating method.
  • the thickness of the first pressure-sensitive adhesive layers 12 and 22 is not particularly limited, and is about 1 to 100 ⁇ m, for example.
  • the thickness is preferably 2 to 50 ⁇ m, more preferably 2 to 40 ⁇ m, and still more preferably 5 to 35 ⁇ m.
  • the first release films 11 and 21 protect the pressure-sensitive adhesive layer until practical use.
  • the constituent material of the release film include plastic films such as polyethylene, polypropylene, polyethylene terephthalate, and polyester films, porous materials such as paper, cloth, and nonwoven fabric, nets, foam sheets, metal foils, and laminates thereof.
  • a plastic film is preferably used from the viewpoint of excellent surface smoothness.
  • the plastic film is not particularly limited as long as it can protect the pressure-sensitive adhesive layer.
  • a polyethylene film, a polypropylene film, a polybutene film, a polybutadiene film, a polymethylpentene film, a polyvinyl chloride film, and a vinyl chloride co-polymer are used.
  • examples thereof include a polymer film, a polyethylene terephthalate film, a polybutylene terephthalate film, a polyurethane film, and an ethylene-vinyl acetate copolymer film.
  • the thickness of the first release films 11 and 21 is usually about 5 to 200 ⁇ m, preferably about 5 to 100 ⁇ m.
  • mold release and antifouling treatment with a silicone type, fluorine type, long chain alkyl type or fatty acid amide type release agent, silica powder, etc., coating type, kneading type, vapor deposition type It is also possible to carry out antistatic treatment such as.
  • the release property from the pressure-sensitive adhesive layer can be further improved by appropriately performing a release treatment such as silicone treatment, long-chain alkyl treatment, or fluorine treatment on the surface of the release film.
  • the liquid crystal cell has a structure in which a liquid crystal layer is sealed between a pair of substrates (a first substrate (viewing side surface) Pa and a second substrate (back surface) Pb) disposed to face each other.
  • a liquid crystal layer is sealed between a pair of substrates (a first substrate (viewing side surface) Pa and a second substrate (back surface) Pb) disposed to face each other.
  • VA vertical alignment
  • IPS in-plane switching
  • a liquid crystal display panel has a polarizing film bonded to one or both sides of a liquid crystal cell, and a drive circuit is incorporated as necessary.
  • Organic EL cell (Organic EL cell, organic EL display panel)
  • the organic EL cell has a configuration in which an electroluminescent layer is sandwiched between a pair of electrodes.
  • an arbitrary type such as a top emission method, a bottom emission method, a double emission method, or the like can be used.
  • the organic EL display panel has a polarizing film bonded to one or both sides of an organic EL cell, and a drive circuit is incorporated as necessary.
  • FIG. 2 shows a roll-to-panel type optical display panel manufacturing system using the roll-shaped first optical film 1.
  • a liquid crystal cell will be described as an example of an optical cell
  • a liquid crystal display panel will be described as an example of an optical display panel.
  • the roll-shaped first optical film 1 includes a first release film 11, a first pressure-sensitive adhesive layer 12, a first optical functional film 13, and a first surface protective film 14 that are laminated in this order. As shown in FIG. 1, the roll-shaped first optical film 1 has a width a and a width corresponding to the long side of the liquid crystal panel (substantially shorter than the long side of the liquid crystal cell P).
  • the manufacturing system of the liquid crystal display panel has a first transport unit 81 that transports the liquid crystal cell P to the first pasting unit 64, and a roll-like shape on the first surface P ⁇ b> 1 of the liquid crystal cell P. It has the 2nd conveyance part 82 which conveys liquid crystal cell P after sticking an optical film using the 1st optical film 1.
  • Each transport unit includes a plurality of transport rollers R for transporting the liquid crystal cell P by rotating around a rotation axis parallel to a direction orthogonal to the transport direction.
  • a suction plate or the like may be included.
  • the liquid crystal cell P is disposed in the first transport unit 81 from the storage unit 91 that stores the liquid crystal cell P so that the first surface P1 is the top surface, and is transported to the first pasting unit 64 by the rotation of the transport roller R.
  • the strip-shaped first optical film 10 drawn out from the roll-shaped first optical film 1 is left without cutting the first release film 11 at the cutting portion 61 while adsorbing and fixing the first release film 11 side.
  • the strip-shaped pressure-sensitive adhesive layer 12, the strip-shaped first optical functional film 13, and the strip-shaped first surface protective film 14 are of a predetermined size (length corresponding to the short side of the liquid crystal cell P (substantially shorter than the short side). ))
  • Examples of the cutting by the cutting unit 61 include cutting using a blade (cutting with a cutting blade) and cutting with a laser device. An example of the cut portion s after being cut is indicated by an arrow in FIG.
  • nip roller (not shown) is arranged on the upstream side or the downstream side of the cutting unit 61 and conveys the belt-shaped first optical film 10 may be adopted. Note that nip rollers may be arranged on the upstream side and the downstream side of the cutting portion 61.
  • a first tension adjusting unit for enabling continuous processing so that the processing is not interrupted for a long time in the cutting processing of the strip-shaped first optical film 10 and the subsequent sticking processing and for adjusting the slackness of the film. 62 is provided.
  • the first tension adjusting unit 62 includes a dancer mechanism using a weight, for example.
  • a configuration in which a nip roller (not shown) is disposed on the upstream side or the downstream side of the first tension adjusting unit 62 and conveys the first optical film 10 may be employed. Note that the nip rollers may be arranged on the upstream side and the downstream side of the first tension adjusting unit 62.
  • the first optical film 10 is wound around the first peeling portion 63 and reversed, and the first optical film 10 is peeled from the first release film 11.
  • the first release film 11 is wound on a roll by the first winding unit 65.
  • the 1st winding part 65 has a roll and a rotation drive part, and winds the 1st release film 11 to a roll, when a rotation drive part rotates a roll.
  • the structure which a nip roller not shown is arrange
  • the first pasting portion 64 conveys the liquid crystal cell P while the first optical film 10 from which the first release film 11 has been peeled off the first surface P1 of the liquid crystal cell P via the first adhesive layer 12. And paste.
  • the 1st sticking part 64 is comprised by a pair of 1st roller 64a and the 2nd roller 64b. Either one may be a driving roller and the other may be a driven roller, and both rollers may be driving rollers.
  • the first optical film 10 is attached to the first surface P1 of the liquid crystal cell P by feeding the first optical film 10 and the liquid crystal cell P to the downstream while sandwiching the first optical film 10 and the liquid crystal cell P by the pair of first roller 64a and second roller 64b.
  • the liquid crystal cell P after the sheet-shaped first optical film 10 is attached to the first surface P1 of the liquid crystal cell P is transported downstream by the second transport unit 82.
  • FIG. 3 shows a manufacturing system of a sheet-to-panel type optical display panel using the sheet-like first optical film 2.
  • a liquid crystal cell will be described as an example of an optical cell
  • a liquid crystal display panel will be described as an example of an optical display panel.
  • the sheet-like first optical film 2 In the sheet-like first optical film 2, a first release film 21, a first pressure-sensitive adhesive layer 22, a first optical functional film 23, a first surface protective film 24, and a second surface protective film are laminated in this order. .
  • the sheet-like first optical film 2 is longitudinally a and laterally b, and has a width corresponding to the long side of the liquid crystal panel (substantially shorter than the long side of the liquid crystal cell P). .
  • the liquid crystal display panel manufacturing system includes a third transport unit 181 that transports the liquid crystal cell P to a single wafer pasting device 164 (corresponding to the second pasting unit), the liquid crystal cell P.
  • the fourth transport unit 182 transports the liquid crystal cell P after the optical film is attached to the first surface P1 using the sheet-like first optical film 2.
  • Each transport unit includes a plurality of transport rollers R for transporting the liquid crystal cell P by rotating around a rotation axis parallel to a direction orthogonal to the transport direction.
  • a suction plate or the like may be included.
  • the liquid crystal cell P is disposed on the third transport unit 181 so that the first surface P1 is the top surface, and is transported to the single wafer pasting device 164 by the rotation of the transport roller R.
  • the sheet-like first optical film 2 is adsorbed by the adsorption unit 164a of the sheet-fusing device 164 and supplied to the bonding position.
  • the first release film 21 is peeled off from the sheet-like first optical film 2 by a peeling means.
  • the suction surface of the suction part 164a has a circular arc cross section.
  • the peeling means may peel off the first release film 21 by sticking the adhesive tape to the surface of the first release film 21 using an adhesive tape and moving the adhesive tape with a moving mechanism.
  • the single wafer pasting device 164 has a fixed surface 164b, and the fixed surface 164b sucks and fixes the first surface P1 side of the liquid crystal cell P.
  • the sheet-like second optical film 2 in a state where the first release film 21 is peeled and the first pressure-sensitive adhesive layer 22 is exposed is pasted on the first surface P1 of the liquid crystal cell P so as to roll the adsorption portion 164a.
  • the second surface protective film 25 is peeled off.
  • the peeling treatment may be performed manually or with a peeling device.
  • the optical film is attached to the one surface (first surface P1) of the liquid crystal cell by the roll-to-panel method, but the present invention is not limited to this.
  • An optical film may be attached to the other surface (second surface P2) of the liquid crystal cell by a roll-to-panel method or a sheet-to-panel method.
  • the optical film is attached to the one surface (first surface P1) of the liquid crystal cell using the sheet-to-panel method, but the present invention is not limited to this.
  • An optical film may be attached to the other surface (second surface P2) of the liquid crystal cell by a roll-to-panel method or a sheet-to-panel method.
  • an optical inspection may be performed after the optical film is attached to one or both sides.
  • the optical film is removed from the liquid crystal cell (optical cell), and the optical cell is again mounted in the second panel manufacturing unit (sheet-to-panel method).
  • the liquid crystal display panel (optical display panel) may be remanufactured by pasting.
  • the above-described optical film is used as the roll-shaped optical film, but the configuration of the roll-shaped optical film is not limited thereto.
  • the band-shaped optical film was cut at a predetermined interval in the width direction (half cut), but from the viewpoint of improving the yield, the band-shaped optical film was cut in the width direction so as to avoid a defective portion of the band-shaped optical film.
  • the optical film including the defective portion may be cut at a size smaller than a predetermined interval (the size of the optical cell) (more preferably at a size as small as possible).
  • the description has been given by taking a horizontally long liquid crystal cell and a liquid crystal display panel as examples.
  • the shape of the liquid crystal cell and the liquid crystal display panel has another set of sides facing each other and another set of sides facing each other. As long as it is a shape, it is not particularly limited.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Mechanical Engineering (AREA)
  • Liquid Crystal (AREA)
  • Theoretical Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Polarising Elements (AREA)
  • Mathematical Physics (AREA)
  • Laminated Bodies (AREA)
PCT/JP2017/023959 2016-07-22 2017-06-29 枚葉状の光学フィルム WO2018016290A1 (ja)

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TW201805655A (zh) 2018-02-16
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