WO2016052536A1 - Film polarisant protégé sur une face, film polarisant doté d'une couche adhésive sensible à la pression, dispositif d'affichage d'image, et procédé de production continue associé - Google Patents

Film polarisant protégé sur une face, film polarisant doté d'une couche adhésive sensible à la pression, dispositif d'affichage d'image, et procédé de production continue associé Download PDF

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Publication number
WO2016052536A1
WO2016052536A1 PCT/JP2015/077576 JP2015077576W WO2016052536A1 WO 2016052536 A1 WO2016052536 A1 WO 2016052536A1 JP 2015077576 W JP2015077576 W JP 2015077576W WO 2016052536 A1 WO2016052536 A1 WO 2016052536A1
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Prior art keywords
polarizing film
adhesive layer
polarizer
film
pressure
Prior art date
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PCT/JP2015/077576
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English (en)
Japanese (ja)
Inventor
友徳 上野
聡司 三田
佑輔 茂手木
菁▲王番▼ 徐
岸　敦史
宮武　稔
Original Assignee
日東電工株式会社
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Publication date
Priority claimed from JP2015189278A external-priority patent/JP6077620B2/ja
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to KR1020177008777A priority Critical patent/KR101844935B1/ko
Priority to CN201580053067.4A priority patent/CN107076909B/zh
Priority to SG11201706375PA priority patent/SG11201706375PA/en
Priority to US15/515,887 priority patent/US10061066B2/en
Publication of WO2016052536A1 publication Critical patent/WO2016052536A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
    • 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • 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

Definitions

  • the present invention relates to a piece protective polarizing film in which a transparent protective film is provided only on one side of a polarizer and a polarizing film with a pressure sensitive adhesive layer having the piece protective polarizing film and a pressure sensitive adhesive layer.
  • the single-protective polarizing film and the polarizing film with the pressure-sensitive adhesive layer can form an image display device such as a liquid crystal display device (LCD) or an organic EL display device as a single or a laminated optical film.
  • LCD liquid crystal display device
  • organic EL display device as a single or a laminated optical film.
  • a polarizing film is used in which a transparent protective film is bonded to one or both sides of a polarizer made of a dichroic material such as a polyvinyl alcohol film and iodine with a polyvinyl alcohol adhesive or the like.
  • an adhesive is usually used.
  • the polarizing film can be fixed instantaneously and has a merit such that a drying step is not required to fix the polarizing film
  • the adhesive is provided in advance as an adhesive layer on one side of the polarizing film. . That is, a polarizing film with an adhesive layer is generally used for attaching the polarizing film.
  • a polarizing film or a polarizing film with a pressure-sensitive adhesive layer can cause the polarizer to contract in a severe environment of thermal shock (for example, a heat shock test in which temperature conditions of ⁇ 30 ° C. and 80 ° C. are repeated or a test at a high temperature of 100 ° C.)
  • thermal shock for example, a heat shock test in which temperature conditions of ⁇ 30 ° C. and 80 ° C. are repeated or a test at a high temperature of 100 ° C.
  • cracks through cracks
  • the polarizing film with an adhesive layer was not sufficiently durable due to thermal shock in the harsh environment.
  • a polarizing film with a pressure-sensitive adhesive layer using a single protective polarizing film provided with a transparent protective film only on one surface of a polarizer has insufficient durability due to the thermal shock.
  • the penetration crack produced by the said thermal shock was easy to generate
  • a polarizing film with an adhesive layer in which a protective layer having a tensile modulus of 100 MPa or more is provided on a single protective polarizing film and an adhesive layer is further provided on the protective layer has been proposed.
  • Patent Document 1 Moreover, it has a protective layer made of a cured product of the curable resin composition on one side of a polarizer having a thickness of 25 ⁇ m or less, has a transparent protective film on the other side of the polarizer, and adheres to the outside of the protective layer.
  • a polarizing film with an adhesive layer having an adhesive layer has been proposed (Patent Document 2).
  • the polarizing film with the pressure-sensitive adhesive layer described in Patent Documents 1 and 2 is effective in terms of suppressing the occurrence of through cracks.
  • a protective layer made of a water-soluble film-forming composition (polyvinyl alcohol-based resin composition) is provided on at least one surface of the polarizer from the viewpoint of thinning and weight reduction.
  • Thinning is also performed for polarizers, and for example, a thin polarizer exhibiting high orientation in which optical characteristics of single transmittance and polarization degree are controlled has been proposed (Patent Document 4).
  • Patent Documents 1 and 2 the thickness is reduced by using a piece protective polarizing film having a transparent protective film only on one side of the polarizer, and on the other hand, by using a piece protective polarizing film by providing a protective layer.
  • the occurrence of through cracks in the absorption axis direction of the generated polarizer is suppressed.
  • production of the through crack to the absorption-axis direction of a polarizer is suppressed by providing a protective layer in a polarizer.
  • thinning is also done for polarizers.
  • the polarizer used for the polarizing film or the polarizing film with the pressure-sensitive adhesive layer is thinned (for example, when the thickness is 10 ⁇ m or less), the change in the contraction stress of the polarizer is small. Therefore, it was found that the thinning can suppress the occurrence of the through cracks according to the polarizer.
  • the optical characteristics are controlled as in Patent Document 4 and the polarizer is thinned (for example, When the thickness is 10 ⁇ m or less), when a mechanical shock is applied to the one-side protective polarizing film or the polarizing film with an adhesive layer using the same (including the case where a load due to convex folding is applied to the polarizer side), It was found that a very fine slit (hereinafter also referred to as nano slit) is generated in the absorption axis direction of the polarizer.
  • nano slit very fine slit
  • the nano slits occur regardless of the size of the polarizing film. Furthermore, it has also been found that the nano slit does not occur when both protective polarizing films having transparent protective films on both sides of the polarizer are used. In addition, when a through crack occurs in the polarizer, the stress around the through crack is released, so the through crack does not occur adjacently. I found it to happen. Moreover, although the penetration crack has the progressive property extended in the absorption-axis direction of the polarizer in which the crack generate
  • the nano slit is a new problem that occurs when the polarizer is thin and the optical characteristics are controlled within a predetermined range in the single-protective polarizing film in which the generation of through cracks is suppressed. It has been found that this is a problem caused by a phenomenon different from the above-described through crack.
  • the nano slit is extremely thin, it cannot be detected under a normal environment. Therefore, even if nanoslits are generated in the polarizer, it is difficult to confirm the defects due to light leakage of the one-side protective polarizing film and the polarizing film with the pressure-sensitive adhesive layer using it. That is, usually, the piece-protecting polarizing film is produced in the form of a long film and automatically inspected for defects by optical inspection, but it is difficult to detect nanoslits as defects by this defect inspection.
  • the defect caused by the nano slit is that the nano slit spreads in the width direction when the single protective polarizing film or the polarizing film with the adhesive layer is bonded to the glass substrate of the image display panel and placed in a heating environment. It was also found that detection is possible (for example, the presence or absence of light leakage).
  • the present invention is a piece protective polarizing film having a transparent protective film only on one side of a polarizer, wherein the polarizer has predetermined optical properties and has a thickness of 10 ⁇ m or less, and through cracks and nano slits. It aims at providing the piece protection polarizing film which can suppress the defect by this. Moreover, this invention aims at providing the polarizing film with an adhesive layer which has the said piece protection polarizing film and an adhesive layer.
  • Another object of the present invention is to provide an image display device having the piece protective polarizing film or the pressure-sensitive adhesive layer-attached polarizing film, and a continuous production method thereof.
  • the present invention is a piece protective polarizing film having a transparent protective film only on one side of the polarizer
  • the polarizer contains a polyvinyl alcohol-based resin, has a thickness of 10 ⁇ m or less, and has an optical characteristic expressed by a single transmittance T and a polarization degree P of the following formula: P> ⁇ (10 0.929T-42 .4 ⁇ 1) ⁇ 100 (where T ⁇ 42.3), or P ⁇ 99.9 (provided that T ⁇ 42.3) is satisfied,
  • the present invention relates to a single-protective polarizing film, which is a formed material formed of a polyvinyl alcohol-based resin on the other surface of the polarizer and has a transparent resin layer having a thickness of 0.2 ⁇ m or more.
  • the transparent resin layer has a heat of crystal melting of 30 mj / mg or more.
  • the transparent resin layer preferably has a thickness of less than 3 ⁇ m.
  • the polyvinyl alcohol resin preferably has a saponification degree of 99.0% or more and an average polymerization degree of 1000 or more.
  • the said piece protection polarizing film WHEREIN The said formation material can be formed by what does not contain a sclerosing
  • the polyvinyl alcohol resin is preferably a polyvinyl alcohol resin.
  • the polarizer preferably contains boric acid in an amount of 25% by weight or less based on the total amount of the polarizer.
  • the present invention also relates to the above-mentioned piece protective polarizing film and a polarizing film with an adhesive layer, characterized by having an adhesive layer.
  • the polarizing film with the pressure-sensitive adhesive layer can be used in a mode in which the pressure-sensitive adhesive layer is provided on the transparent resin layer of the piece protective polarizing film. Moreover, the said polarizing film with an adhesive layer can be used in the aspect by which the said adhesive layer is provided in the transparent protective film of the said piece protection polarizing film. Moreover, a separator can be provided in the adhesive layer of the polarizing film with an adhesive layer. The polarizing film with an adhesive layer provided with a separator can be used as a wound body.
  • the present invention also relates to an image display device having the piece protective polarizing film or the polarizing film with an adhesive layer.
  • the polarizing film with the pressure-sensitive adhesive layer fed out from the wound body of the polarizing film with the pressure-sensitive adhesive layer and conveyed by the separator is continuously applied to the surface of the image display panel via the pressure-sensitive adhesive layer.
  • the present invention relates to a continuous manufacturing method of an image display device including a step of bonding to a substrate.
  • the piece-protecting polarizing film and the polarizing film with a pressure-sensitive adhesive layer of the present invention use a polarizer having a thickness of 10 ⁇ m or less, and are thinned.
  • the thin polarizer having a thickness of 10 ⁇ m or less has a smaller change in shrinkage stress applied to the polarizer due to thermal shock than in the case where the thickness of the polarizer is large, generation of a through crack can be suppressed.
  • the nano-slit is a process for producing a piece-protecting polarizing film, a step for producing a polarizing film with a pressure-sensitive adhesive layer in which a pressure-sensitive adhesive layer is provided on the piece-protecting polarizing film, and various steps after producing a polarizing film with a pressure-sensitive adhesive layer. It is considered to occur when a mechanical shock is applied to the polarizing film or the polarizing film with the pressure-sensitive adhesive layer using the polarizing film, and is assumed to be generated by a mechanism different from the through crack generated by the thermal shock.
  • the defect due to the nano slit is that when the single protective polarizing film or the polarizing film with the pressure-sensitive adhesive layer is bonded to the glass substrate of the image display panel and placed in a heating environment, the nano slit is in the width direction. Detection is possible by spreading (for example, the presence or absence of light leakage).
  • the nano resin is provided by providing a transparent resin layer having a thickness of 0.2 ⁇ m or more on the other surface of the polarizer (the surface having no transparent protective film). Generation of slits can be suppressed.
  • the piece protective polarizing film of the present invention and the polarizing film with an adhesive layer using the same have a transparent resin layer having a thickness of 0.2 ⁇ m or more formed from a forming material containing a polyvinyl alcohol-based resin.
  • production of the penetration crack and nano slit which arise in a polarizer can be suppressed, satisfying thickness reduction.
  • the nano slit is extremely thin, it cannot be detected under a normal environment. Therefore, even if nanoslits are generated in the polarizer, it is difficult to confirm the defects due to light leakage of the one-side protective polarizing film and the polarizing film with the pressure-sensitive adhesive layer using it.
  • the defect due to the nano slit can be detected by spreading the nano slit in the width direction when the single protective polarizing film or the polarizing film with the pressure-sensitive adhesive layer is placed in a heating environment (for example, the presence or absence of light leakage).
  • the transparent resin layer constitutes a part of the piece protective polarizing film, it is desired to maintain the polarization degree of the polarizing film even in a high-temperature and high-humidity environment or a hot water environment.
  • it is a layer formed from a forming material containing a water-soluble polyvinyl alcohol resin as a main component, by controlling the heat of crystal melting of the transparent resin layer to 30 mj / mg or more, defects due to through cracks and nano slits While suppressing generation
  • a polyvinyl alcohol resin having a saponification degree of 99.0% or more and an average polymerization degree of 1000 or more can be used.
  • the piece protective polarizing film 11 and the polarizing film 12 with an adhesive layer of the present invention will be described with reference to FIGS.
  • the single protective polarizing film 10 (in the case where the transparent resin layer 3 is not provided) has the transparent protective film 2 only on one surface of the polarizer 1.
  • the polarizer 1 and the transparent protective film 2 are laminated via intervening layers such as an adhesive layer, a pressure-sensitive adhesive layer, and an undercoat layer (primer layer).
  • the piece protection polarizing film 10 can laminate
  • the single protective polarizing film 11 (with a transparent resin layer 3) of the present invention is provided on the other single surface of the polarizer 1 (the surface without the transparent protective film 2) in the single protective polarizing film 10.
  • a transparent resin layer 3 formed from a forming material containing a polyvinyl alcohol-based resin is provided (directly).
  • the polarizing film 12 with an adhesive layer of this invention has the piece protection polarizing film (with transparent resin layer) 11 and the adhesive layer 4, as shown in FIG.
  • the pressure-sensitive adhesive layer 4 is provided on the transparent resin layer 3 side in FIG. 2 (A) and on the transparent protective film 2 side in FIG. 2 (B).
  • the separator 5 can be provided in the adhesive layer 4 of the polarizing film 12 with an adhesive layer of this invention, and the surface protection film 6 can be provided in the other side.
  • the polarizing film 12 with an adhesive layer of FIG. 2 the case where both the separator 5 and the surface protection film 6 are provided is shown.
  • the pressure-sensitive adhesive layer-attached polarizing film 12 having at least the separator 5 (and further having the surface protective film 6) can be used as a wound body, and as described later, for example, the separator 5 is fed out from the wound body.
  • the polarizing film 12 with the pressure-sensitive adhesive layer conveyed by the above is also referred to as a “roll-to-panel method” (hereinafter referred to as “roll-to-panel method”). This is advantageous for application to the specification No. 4406043.
  • As a polarizing film with an adhesive layer the aspect shown to FIG. 2 (A) is preferable from viewpoints, such as suppression of the curvature of the display panel after bonding, generation
  • the surface protective film 6 can be provided on the piece protective polarizing film 10 and the piece protective polarizing film 11 (with a transparent resin layer).
  • FIG. 3 is a conceptual diagram comparing the nano slit a and the through crack b generated in the polarizer.
  • 3A shows a nano slit a generated in the polarizer 1
  • FIG. 3B shows a through crack b generated in the polarizer 1.
  • the nano slit a is generated by mechanical impact and is partially generated in the absorption axis direction of the polarizer 1.
  • the nano slit a cannot be confirmed at the beginning, but is in a thermal environment (for example, 80 ° C. or 60 ° C., 90% RH), it can be confirmed by the spread in the width direction.
  • it is considered that the nano slit a does not have a progressive property extending in the absorption axis direction of the polarizer.
  • the said nano slit a arises irrespective of the size of a polarizing film.
  • the nano slits a may occur not only independently but also adjacent to each other.
  • the through crack b is generated by a thermal shock (for example, a heat shock test).
  • the through crack has a process of extending in the absorption axis direction of the polarizer where the crack has occurred.
  • the peripheral stress is released, so that the through crack does not occur adjacently.
  • FIG. 4 is an example of a photograph of a cross-sectional view of the piece protective polarizing film 10 or the piece protective polarizing film 11 with a transparent resin layer related to generation, expansion, and repair of nano slits a generated in the polarizer.
  • FIG. 4 (A) is an example of a case in which a single protective polarizing film 10 having a transparent protective film 2 via an adhesive layer 2a only on one side of the polarizer 1 and no nanoslit is generated.
  • FIG. 4B is an example when nano slits a are generated in the piece protective polarizing film 10. 4A and 4B are both before heating.
  • FIG.4 (C) is an example of the photograph of sectional drawing after heating the piece protection polarizing film 10 in which the nano slit a has generate
  • FIG.4 (C) it turns out that the nano slit a of the polarizer 1 is expanded by heating.
  • FIG. 4 (D) is a photograph of a sectional view of a piece protective polarizing film 11 with a transparent resin layer in which a transparent resin layer 3 (thickness 1 ⁇ m) is formed on the piece protective polarizing film 10 in which nano slits a are generated. It is an example.
  • FIG. 4 (D) is a photograph of a sectional view of a piece protective polarizing film 11 with a transparent resin layer in which a transparent resin layer 3 (thickness 1 ⁇ m) is formed on the piece protective polarizing film 10 in which nano slits a are generated. It is an example.
  • FIG. 4 (D) is a photograph of a sectional view of a piece protective
  • FIG. 4E is an example of a photograph of a cross-sectional view after heating the piece protective polarizing film 11 with the transparent resin layer on which the transparent resin layer 3 (thickness 1 ⁇ m) is formed.
  • FIG. 4E it can be seen that there is no expansion of the repaired (a ′) nanoslit after heating.
  • FIG. 4F is a cross-sectional view of a piece protective polarizing film 11 ′ with a transparent resin layer in which a transparent resin layer 3 ′ (thickness 0.1 ⁇ m) is formed on the piece protective polarizing film 10 in which nano slits a are generated.
  • FIG. 4F It is an example of a photograph.
  • FIG. 4F it can be seen that although the transparent resin layer 3 'is provided, the nano slit a of the polarizer 1 is expanded by heating because the thickness is thin.
  • the section was cut with a cross session polisher or a microtome perpendicular to the absorption axis direction of the sample, and observed with a scanning electron microscope.
  • a polarizer having a thickness of 10 ⁇ m or less is used.
  • the thickness of the polarizer is preferably 8 ⁇ m or less, more preferably 7 ⁇ m or less, and further preferably 6 ⁇ m or less from the viewpoint of reducing the thickness and preventing the occurrence of through cracks.
  • 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 polarizer using a polyvinyl alcohol 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 polarizer preferably contains boric acid from the viewpoint of stretching stability and optical durability.
  • the content of boric acid contained in the polarizer is preferably 25% by weight or less, more preferably 20% by weight or less, based on the total amount of the polarizer, from the viewpoint of suppressing the generation of through cracks and nano slits and suppressing expansion. Preferably, it is 18% by weight or less, and more preferably 16% by weight or less.
  • the boric acid content with respect to the total amount of the polarizer is preferably 10% by weight or more, and more preferably 12% by weight or more.
  • 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 0.929T-42.4 ⁇ 1) ⁇ 100 (where T ⁇ 42.3) or , It is configured to satisfy the condition of P ⁇ 99.9 (however, T ⁇ 42.3).
  • 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 display device.
  • a polarizer configured to satisfy the above conditions has a high orientation of a polymer (for example, a polyvinyl alcohol-based molecule), so that the thickness of the polarizer is 10 ⁇ m or less.
  • the tensile breaking stress in the direction orthogonal to the absorption axis direction is significantly reduced.
  • this invention is especially suitable for the piece protection polarizing film (or polarizing film with an adhesive layer using the same) which employ
  • 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 and dyeing a polyvinyl alcohol-based resin (hereinafter also referred to as PVA-based resin) layer and a stretching resin base material in a laminated state.
  • PVA-based resin polyvinyl alcohol-based resin
  • a stretching resin base material in a laminated state.
  • Transparent protective film As the material constituting the transparent 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 that forms the transparent protective film include polymer blends.
  • the transparent protective film may contain one or more arbitrary appropriate additives.
  • the additive include an ultraviolet absorber, an antioxidant, a lubricant, a plasticizer, a release agent, a coloring inhibitor, a flame retardant, a nucleating agent, an antistatic agent, a pigment, and a coloring agent.
  • the content of the 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 transparent protective film, a retardation film, a brightness enhancement film, a diffusion film, and the like can also be used.
  • the retardation film include those having a front retardation of 40 nm or more and / or a retardation having a thickness direction retardation of 80 nm or more.
  • the front phase difference is usually controlled in the range of 40 to 200 nm
  • the thickness direction phase difference is usually controlled in the range of 80 to 300 nm.
  • the retardation film functions also as a polarizer protective film, so that the thickness can be reduced.
  • the retardation film examples include a birefringent film obtained by uniaxially or biaxially stretching a thermoplastic resin film.
  • the stretching temperature, stretching ratio, and the like are appropriately set depending on the retardation value, film material, and thickness.
  • the thickness of the transparent protective film can be appropriately determined, but is generally about 1 to 500 ⁇ m from the viewpoints of workability such as strength and handleability, and thin layer properties. In particular, it is preferably 1 to 300 ⁇ m, more preferably 5 to 200 ⁇ m, and further preferably 5 to 150 ⁇ m, particularly 20 to 100 ⁇ m.
  • Functional surfaces such as a hard coat layer, an antireflection layer, an anti-sticking layer, a diffusion layer or an antiglare layer can be provided on the surface of the transparent protective film to which the polarizer is not adhered (particularly the embodiment shown in FIG. 1).
  • 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 transparent 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.
  • an intervening layer such as an adhesive layer, an adhesive layer, and an undercoat layer (primer layer).
  • the adhesive layer is formed with 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.
  • water-based adhesives examples include isocyanate-based adhesives, polyvinyl alcohol-based adhesives, gelatin-based adhesives, vinyl-based latex systems, and water-based polyesters.
  • 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 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.
  • 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.
  • the adhesive coating method is appropriately selected depending on the viscosity of the adhesive and the target thickness.
  • coating methods include reverse coaters, gravure coaters (direct, reverse and offset), bar reverse coaters, roll coaters, die coaters, bar coaters, rod coaters and the like.
  • a method such as a dapping method can be appropriately used.
  • the adhesive is preferably applied so that the finally formed adhesive layer has a thickness of 30 to 300 nm.
  • the thickness of the adhesive layer is more preferably 60 to 250 nm.
  • the thickness of the adhesive layer is preferably 0.1 to 200 ⁇ m. More preferably, it is 0.5 to 50 ⁇ m, and still more preferably 0.5 to 10 ⁇ m.
  • 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 easy-adhesion layer is usually provided in advance on a transparent protective film, and the easy-adhesion layer side of the transparent protective film and the polarizer are laminated with an adhesive layer.
  • the easy-adhesion layer is formed by coating and drying the material for forming the easy-adhesion layer on the transparent protective film by a known technique.
  • the material for forming the easy-adhesion layer is usually adjusted as a solution diluted to an appropriate concentration in consideration of the thickness after drying and the smoothness of coating.
  • the thickness of the easy-adhesion layer after drying is preferably 0.01 to 5 ⁇ m, more preferably 0.02 to 2 ⁇ m, and still more preferably 0.05 to 1 ⁇ m. Note that a plurality of easy-adhesion layers can be provided, but also in this case, the total thickness of the easy-adhesion layers is preferably in the above range.
  • 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.
  • the transparent resin layer is formed from a forming material containing a polyvinyl alcohol-based resin.
  • the polyvinyl alcohol resin forming the transparent resin layer may be the same as or different from the polyvinyl alcohol resin contained in the polarizer as long as it is a “polyvinyl alcohol resin”.
  • the transparent resin layer can be formed by applying the forming material to, for example, a polarizer.
  • the transparent resin layer is provided on the other surface of the polarizer (the surface not having the transparent protective film) in the single-protective polarizing film having the transparent protective film only on one surface of the polarizer.
  • a mechanical impact may be applied so that the polarizer is bent convexly toward the image display panel during handling. At this time, stress concentrates on the tip of the convex side of the polarizer, and the polarizer breaks to form a nano slit.
  • the transparent resin layer is formed of a forming material made of polyvinyl alcohol resin, for example, the transparent resin layer is formed on the convex side of the polarizer. Since the said transparent resin layer is a layer which consists of polyvinyl alcohol with low boric acid content, it is hard to generate
  • the transparent resin layer when a polyvinyl alcohol-based resin is used as the transparent resin layer, boric acid contained in the polarizer is partially oozed out in the transparent resin layer formation process, so that the boric acid content in the polarizer is reduced. Therefore, the nanoslit is hardly generated in the polarizer itself. If the thickness of the transparent resin layer is 0.2 ⁇ m or more, as described above, the generation of nano slits due to handling after being attached to an image display panel or the like can be effectively suppressed.
  • the thickness of the transparent resin layer is preferably 0.5 ⁇ m or more, and more preferably 0.7 ⁇ m or more. On the other hand, if the transparent resin layer becomes too thick, the optical reliability and water resistance are lowered.
  • the thickness of the transparent resin layer is preferably less than 3 ⁇ m, and more preferably 2 ⁇ m or less.
  • the said transparent resin layer can suppress generation
  • the nano slit generated in the polarizer is caused by mechanical impact, and the nano slit tends to spread in the width direction under a thermal environment.
  • the transparent resin layer formed from the forming material containing the polyvinyl alcohol resin is under a thermal environment. The mechanical holding ability of the transparent resin layer can be maintained and the spread of the nano slits in the width direction can be suppressed.
  • the transparent resin layer is preferably controlled to have a heat of crystal melting of 30 mj / mg or more.
  • the transparent resin layer is formed of a forming material mainly composed of a water-soluble polyvinyl alcohol-based resin. By controlling the heat of crystal melting of the transparent resin layer to 30 mj / mg or more, the moisture and heat resistance of the transparent resin layer Water resistance can be satisfied.
  • the crystal melting heat quantity of the transparent resin layer is a value measured based on the description of the examples.
  • the crystal melting heat quantity of the transparent resin layer is preferably 40 mj / mg or more, more preferably 50 mj / mg or more.
  • the amount of heat of crystal melting of the transparent resin layer is the type of polyvinyl alcohol resin, the degree of saponification of the polyvinyl alcohol resin, the degree of polymerization, and the curable component (the ratio of use of a crosslinking agent, etc.) that can be used as a forming material, Etc.).
  • polyvinyl alcohol resin examples include polyvinyl alcohol.
  • Polyvinyl alcohol is obtained by saponifying polyvinyl acetate.
  • polyvinyl alcohol-based resin examples include a saponified product of a copolymer of vinyl acetate and a monomer having copolymerizability.
  • the copolymerizable monomer is ethylene
  • an ethylene-vinyl alcohol copolymer is obtained.
  • the copolymerizable monomer include unsaturated carboxylic acids such as (anhydrous) maleic acid, fumaric acid, crotonic acid, itaconic acid, (meth) acrylic acid, and esters thereof; ethylene, propylene, and the like.
  • ⁇ -olefin (meth) allylsulfonic acid (soda), sulfonic acid soda (monoalkylmalate), disulfonic acid soda alkylmalate, N-methylolacrylamide, acrylamide alkylsulfonic acid alkali salt, N-vinylpyrrolidone, N- Examples include vinyl pyrrolidone derivatives.
  • These polyvinyl alcohol resins can be used alone or in combination of two or more.
  • Polyvinyl alcohol obtained by saponifying polyvinyl acetate is preferable from the viewpoint of controlling the heat of crystal fusion of the transparent resin layer to 30 mj / mg or more and satisfying heat and moisture resistance and water resistance.
  • the saponification degree of the polyvinyl alcohol resin can be, for example, 88% or more, but preferably 95% or more. From the viewpoint of satisfying moisture heat resistance and water resistance by controlling the heat of crystal fusion of the transparent resin layer to 30 mj / mg or more, the saponification degree is more preferably 99% or more, and further preferably 99.7% or more. .
  • the degree of saponification represents the proportion of units that are actually saponified to vinyl alcohol units among the units that can be converted to vinyl alcohol units by saponification, and the residue is a vinyl ester unit.
  • the degree of saponification can be determined according to JIS K 6726-1994.
  • the average degree of polymerization of the polyvinyl alcohol-based resin can be, for example, 500 or more, and the heat of crystal melting of the transparent resin layer is controlled to 30 mj / mg or more to satisfy the moisture and heat resistance and water resistance. From the viewpoint, the average degree of polymerization is preferably 1000 or more, more preferably 1500 or more, and further preferably 2000 or more. The average degree of polymerization of the polyvinyl alcohol resin is measured according to JIS-K6726.
  • a modified polyvinyl alcohol resin having a hydrophilic functional group in the side chain of the polyvinyl alcohol or a copolymer thereof can be used.
  • the hydrophilic functional group include an acetoacetyl group and a carbonyl group.
  • modified polyvinyl alcohol obtained by acetalization, urethanization, etherification, grafting, phosphoric esterification or the like of a polyvinyl alcohol resin can be used.
  • the transparent resin layer of the present invention is formed from a forming material containing the polyvinyl alcohol-based resin as a main component, and the forming material can contain a curable component (crosslinking agent) and the like.
  • the proportion of the polyvinyl alcohol-based resin in the transparent resin layer or the forming material (solid content) is preferably 80% by weight or more, more preferably 90% by weight or more, and further preferably 95% by weight or more.
  • the forming material does not contain a curable component (crosslinking agent) from the viewpoint of easily controlling the heat of crystal fusion of the transparent resin layer to 30 mj / mg or more.
  • a compound having at least two functional groups having reactivity with the polyvinyl alcohol resin can be used.
  • alkylenediamine having two alkylene groups and two amino groups such as ethylenediamine, triethylenediamine, hexamethylenediamine; tolylene diisocyanate, hydrogenated tolylene diisocyanate, trimethylolpropane tolylene diisocyanate adduct, triphenylmethane triisocyanate, methylene bis (4-Phenylmethane triisocyanate, isophorone diisocyanate and isocyanates such as ketoxime block product or phenol block product thereof; ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, glycerin di or triglycidyl ether, 1,6-hexane Diol diglycidyl ether, trimethylolpropane triglycidyl ether, di Epoxies
  • amino-formaldehyde resins and water-soluble dihydrazine are preferred, and compounds having a methylol group are preferred as the amino-formaldehyde resin, and methylol melamine, which is a compound having a methylol group, is particularly preferred.
  • hardenable component crosslinking agent
  • the ratio is 20 weight part or less, 10 weight part or less, 5 weight part with respect to 100 weight part of polyvinyl alcohol-type resin. It is preferable that:
  • the forming material is prepared as a solution in which the polyvinyl alcohol resin is dissolved in a solvent.
  • the solvent include water, dimethyl sulfoxide, dimethylformamide, dimethylacetamide N-methylpyrrolidone, various glycols, alcohols, amines such as ethylenediamine and diethylenetriamine. These may be used alone or in combination of two or more. Among these, it is preferable to use it as an aqueous solution using water as a solvent.
  • the concentration of the polyvinyl alcohol-based resin in the forming material (for example, an aqueous solution) is not particularly limited, but is 0.1 to 15% by weight, preferably 0.5%, in consideration of coating properties and storage stability. ⁇ 10% by weight.
  • a plasticizer for example, polyhydric alcohols such as ethylene glycol and glycerin.
  • the surfactant include nonionic surfactants.
  • coupling agents such as silane coupling agents and titanium coupling agents, various tackifiers, ultraviolet absorbers, antioxidants, heat stabilizers, hydrolysis stabilizers, and other stabilizers can be added.
  • the transparent resin layer can be formed by applying and drying the forming material on the other surface of the polarizer (the surface not having the transparent protective film).
  • the forming material is applied so that the thickness after drying is 0.2 ⁇ m or more.
  • the application operation is not particularly limited, and any appropriate method can be adopted.
  • various means such as a roll coating method, a spin coating method, a wire bar coating method, a dip coating method, a die coating method, a curtain coating method, a spray coating method, a knife coating method (comma coating method, etc.) can be employed.
  • Adhesive layer An appropriate pressure-sensitive adhesive can be used for forming the pressure-sensitive adhesive layer, and the type thereof is not particularly limited.
  • 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.
  • the polymerization solvent is dried and removed to form the pressure-sensitive adhesive layer, and then in the embodiment of FIG.
  • the adhesive or the transparent protective film in the embodiment of FIG. 2B or the polarizer (or the transparent protective film in the embodiment of FIG. 2B) in the embodiment of FIG. It is produced by, for example, a method of forming a pressure-sensitive adhesive layer on a polarizer by applying and removing a polymerization solvent by drying.
  • one or more solvents other than the polymerization solvent may be added as appropriate.
  • a silicone release liner is preferably used as the release-treated separator.
  • 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.
  • 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.
  • Various methods are used as a method for forming the pressure-sensitive adhesive layer. 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 pressure-sensitive adhesive layer is not particularly limited, and is, for example, about 1 to 100 ⁇ m.
  • the thickness is preferably 2 to 50 ⁇ m, more preferably 2 to 40 ⁇ m, and still more preferably 5 to 35 ⁇ m.
  • the pressure-sensitive adhesive layer When the pressure-sensitive adhesive layer is exposed, the pressure-sensitive adhesive layer may be protected with a peeled sheet (separator) until practical use.
  • constituent material of the separator examples include, for example, 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.
  • 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 thin film can be used, but a plastic film is preferably used because of its 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 separator 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 separator.
  • a surface protective film can be provided on the single protective polarizing film and the polarizing film with the pressure-sensitive adhesive layer.
  • the surface protective film usually has a base film and an adhesive layer, and protects the polarizer via the adhesive layer.
  • 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. Examples thereof include transparent polymers such as resins. Of these, polyester resins are preferred.
  • 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 generally 500 ⁇ m or less, preferably 10 to 200 ⁇ m.
  • the pressure-sensitive adhesive that forms the pressure-sensitive adhesive layer of the surface protective film includes a (meth) acrylic polymer, a silicone-based polymer, a polyester, a polyurethane, a polyamide, a polyether, a fluorine-based or a rubber-based pressure-sensitive adhesive. 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 surface protective film can be provided with a release treatment layer on the surface opposite to the surface on which the pressure-sensitive adhesive layer is provided on the base film, using a low adhesion material such as silicone treatment, long-chain alkyl treatment, or fluorine treatment. .
  • the piece-protecting polarizing film and the polarizing film with a pressure-sensitive adhesive layer of the present invention can be used as an optical film laminated with another optical layer in practical use.
  • the optical layer is not particularly limited.
  • a liquid crystal display device such as a reflection plate, a semi-transmission plate, a retardation plate (including wavelength plates such as 1/2 and 1/4), and a viewing angle compensation film.
  • One or more optical layers that may be used can be used.
  • a reflective polarizing film or a semi-transmissive polarizing film in which a reflective plate or a semi-transmissive reflective plate is further laminated on the piece protective polarizing film of the present invention an elliptical polarizing film in which a retardation plate is further laminated on the polarizing film, or A circular viewing film, a wide viewing angle polarizing film in which a viewing angle compensation film is further laminated on the polarizing film, or a polarizing film in which a brightness enhancement film is further laminated on the polarizing film are preferable.
  • An optical film obtained by laminating the above optical layer on a single protective polarizing film or a polarizing film with a pressure-sensitive adhesive layer can be formed by a method of sequentially laminating separately in the manufacturing process of a liquid crystal display device, etc.
  • the optical film is excellent in quality stability and assembly work, and has the advantage of improving the manufacturing process of liquid crystal display devices and the like.
  • an appropriate adhesive means such as a pressure-sensitive adhesive layer can be used.
  • their optical axes can be arranged at an appropriate angle depending on the intended retardation characteristics and the like.
  • the piece protective polarizing film, the polarizing film with an adhesive layer or the optical film of the present invention can be preferably used for forming various image display devices such as a liquid crystal display device and an organic EL display device.
  • the liquid crystal display device can be formed according to the conventional method. That is, a liquid crystal display device is generally formed by appropriately assembling components such as a liquid crystal cell, a polarizing film with an adhesive layer or an optical film, and an illumination system as necessary, and incorporating a drive circuit.
  • a piece-protecting polarizing film, a polarizing film with a pressure-sensitive adhesive layer or an optical film according to the present invention is used.
  • As the liquid crystal cell an arbitrary type such as an IPS type or a VA type can be used, but is particularly suitable for the IPS type.
  • liquid crystal display devices such as a liquid crystal display device in which a single protective polarizing film, a polarizing film with an adhesive layer or an optical film are arranged on one or both sides of a liquid crystal cell, or a backlight or reflector used in an illumination system are formed.
  • the polarizing film with a pressure-sensitive adhesive layer or the optical film according to the present invention can be installed on one side or both sides of the liquid crystal cell.
  • a single protective polarizing film, a polarizing film with an adhesive layer, or an optical film on both sides they may be the same or different.
  • a single layer or a suitable part such as a diffusing plate, an antiglare layer, an antireflection film, a protective plate, a prism array, a lens array sheet, a light diffusing plate, a backlight, etc.
  • a diffusing plate for example, a diffusing plate, an antiglare layer, an antireflection film, a protective plate, a prism array, a lens array sheet, a light diffusing plate, a backlight, etc.
  • a protective plate such as a prism array, a lens array sheet, a light diffusing plate, a backlight, etc.
  • a prism array such as a prism array, a lens array sheet, a light diffusing plate, a backlight, etc.
  • the above image display device is an image of the polarizing film with the pressure-sensitive adhesive layer fed out from the wound body (roll) of the polarizing film with the pressure-sensitive adhesive layer of the present invention and conveyed by the separator through the pressure-sensitive adhesive layer. It is preferably manufactured by a continuous manufacturing method (roll-to-panel method) including a step of continuously bonding to the surface of the display panel.
  • the polarizing film with a pressure-sensitive adhesive layer of the present invention is a very thin film, it is cut into a sheet (sheet-fed) and then bonded to the image display panel one by one (“sheet-to-panel method”) According to the above), it is difficult to handle the sheet when it is transported or bonded to the display panel, and the polarizing film (sheet) with the adhesive layer is subjected to a large mechanical impact (for example, bending due to adsorption) in these processes. Risk increases. In order to reduce such a risk, it is necessary to take another measure such as using a thick surface protective film having a thickness of 50 ⁇ m or more.
  • the polarizing film with the pressure-sensitive adhesive layer is stably conveyed from the roll to the image display panel by the continuous separator without being cut into a sheet (sheet cutting), Since it is directly bonded to the image display panel, the risk can be greatly reduced without using a thick surface protective film. As a result, it is possible to continuously produce an image display device in which not only defects due to the generation of nanoslits before the formation of the transparent resin layer but also defects due to the generation of nanoslits after the formation of the transparent resin layer are effectively suppressed.
  • FIG. 9 is a schematic view showing an example of a continuous manufacturing system of a liquid crystal display device adopting a roll-to-panel method.
  • the continuous manufacturing system 100 of the liquid crystal display device includes a series of transport units X that transport the liquid crystal display panel P, a first polarizing film supply unit 101a, a first bonding unit 201a, and a second polarizing film supply. Part 101b and 2nd pasting part 201b are included.
  • the wound body (first roll) 20a of the polarizing film with the first pressure-sensitive adhesive layer and the wound body (second roll) 20b of the polarizing film with the second pressure-sensitive adhesive layer have an absorption axis in the longitudinal direction. And the thing of the aspect as described in FIG. 2 (A) is used.
  • the transport unit X transports the liquid crystal display panel P.
  • the conveyance unit X is configured to include a plurality of conveyance rollers, a suction plate, and the like.
  • the transport unit X is an arrangement in which the placement relationship between the long side and the short side of the liquid crystal display panel P is switched between the first bonding unit 201a and the second bonding unit 201b with respect to the transport direction of the liquid crystal display panel P.
  • a replacement unit for example, the liquid crystal display panel P is rotated 90 ° horizontally 300 is included. Thereby, with respect to the liquid crystal display panel P, the polarizing film 21a with the 1st adhesive layer and the polarizing film 21b with the 2nd adhesive layer can be bonded together in the crossed Nicols relationship.
  • the first polarizing film supply unit 101a continuously feeds the first adhesive layer-attached polarizing film (with a surface protective film) 21a fed from the first roll 20a and conveyed by the separator 5a to the first bonding unit 201a. To do.
  • the first polarizing film supply unit 101a includes a first feeding unit 151a, a first cutting unit 152a, a first peeling unit 153a, a first winding unit 154a, and a plurality of conveying roller units, an accumulating unit such as a dancer roll, and the like. Have.
  • the first feeding portion 151a has a feeding shaft on which the first roll 20a is installed, and feeds the strip-shaped pressure-sensitive adhesive layer-attached polarizing film 21a provided with the separator 5a from the first roll 20a.
  • the first cutting unit 152a has cutting means and suction means such as a cutter and a laser device.
  • a strip-like pressure-sensitive adhesive layer-attached polarizing film 21a in which a plurality of score lines are formed in the width direction with a predetermined length is laminated on the separator 5a (an optical film roll with a notch). ) Is not required (the same applies to the second cutting portion 152b described later).
  • the 1st peeling part 153a peels the polarizing film 21a with a 1st adhesive layer from the separator 5a by folding up with the separator 5a inside.
  • Examples of the first peeling portion 153a include a wedge-shaped member and a roller.
  • the first winding unit 154a winds up the separator 5a from which the first pressure-sensitive adhesive layer-attached polarizing film 21a has been peeled off.
  • the first winding unit 154a has a winding shaft on which a roll for winding the separator 5a is installed.
  • the 1st bonding part 201a is the liquid crystal display panel P conveyed by the conveyance part X, the polarizing film 21a with the 1st adhesive layer which peeled the polarizing film 21a with the 1st adhesive layer peeled by the 1st peeling part 153a. Are continuously bonded through the pressure-sensitive adhesive layer (first bonding step).
  • the 1st bonding part 81 has a pair of bonding rollers, and at least one of the bonding rollers is configured by a drive roller.
  • the 2nd polarizing film supply part 101b is continuously supplied to the 2nd bonding part 201b by the 2nd bonding part 201b with the 2nd adhesive film layered polarizing film (with surface protection film) 21b which was drawn
  • the second polarizing film supply unit 101b includes a second feeding unit 151b, a second cutting unit 152b, a second peeling unit 153b, a second winding unit 154b, and a plurality of conveying roller units, an accumulating unit such as a dancer roll, and the like. Have.
  • the second feeding portion 151b, the second cutting portion 152b, the second peeling portion 153b, and the second winding portion 154b are respectively the first feeding portion 151a, the first cutting portion 152a, the first peeling portion 153a, and the first winding. It has the same configuration and function as the taking part 154a.
  • the 2nd bonding part 201b is the liquid crystal display panel P conveyed by the conveyance part X.
  • the 2nd adhesive layer-attached polarizing film 21b peeled off by the 2nd peeling part 153b, the 2nd adhesive layer-attached polarizing film 21b Are continuously bonded through the pressure-sensitive adhesive layer (second bonding step).
  • the 2nd bonding part 201b has a pair of bonding rollers, and at least one of the bonding rollers is comprised with a drive roller.
  • ⁇ Strip protection polarizing film A> (Preparation of polarizer A0)
  • IPA copolymerized PET amorphous isophthalic acid copolymerized polyethylene terephthalate (IPA copolymerized PET) film (thickness: 100 ⁇ m) having a water absorption of 0.75% and Tg of 75 ° C. is subjected to corona treatment.
  • Alcohol polymerization degree 4200, saponification degree 99.2 mol
  • acetoacetyl-modified PVA polymerization degree 1200, acetoacetyl modification degree 4.6%, saponification degree 99.0 mol% or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.
  • aqueous solution containing 9: 1 ratio of the trade name “Gosefimer Z200”) was applied and dried at 25 ° C. to form a PVA-based resin layer having a thickness of 11 ⁇ m, thereby preparing a laminate.
  • the obtained laminate was uniaxially stretched in the longitudinal direction (longitudinal direction) 2.0 times between rolls having different peripheral speeds in an oven at 120 ° C. (air-assisted stretching process).
  • the laminate was immersed in an insolubilization bath (a boric acid aqueous solution obtained by blending 4 parts by weight of boric acid with respect to 100 parts by weight of water) for 30 seconds (insolubilization treatment).
  • boric acid aqueous solution obtained by blending 3 parts by weight of potassium iodide and 3 parts by weight of boric acid with respect to 100 parts by weight of water.
  • Crosslinking treatment Thereafter, the laminate was immersed in a boric acid aqueous solution (an aqueous solution obtained by blending 4 parts by weight of boric acid and 5 parts by weight of potassium iodide with respect to 100 parts by weight of water) at a liquid temperature of 70 ° C.
  • uniaxial stretching was performed between rolls having different peripheral speeds in the longitudinal direction (longitudinal direction) so that the total stretching ratio was 5.5 times (in-water stretching treatment).
  • the laminate was immersed in a cleaning bath (an aqueous solution obtained by blending 4 parts by weight of potassium iodide with respect to 100 parts by weight of water) at a liquid temperature of 30 ° C. (cleaning treatment).
  • a cleaning bath an aqueous solution obtained by blending 4 parts by weight of potassium iodide with respect to 100 parts by weight of water
  • cleaning treatment a liquid temperature of 30 ° C.
  • Polarizers A1 to A8 were produced in the same manner as the production of the polarizer A0 except that the production conditions for the polarizer A0 were changed as shown in Table 1.
  • Table 1 shows the thickness, optical characteristics (single transmittance, polarization degree), and boric acid concentration of the polarizers A1 to A8.
  • Transparent protective film A (meth) acrylic resin film having a lactone ring structure having a thickness of 40 ⁇ m was subjected to corona treatment on the easy adhesion treated surface.
  • An ultraviolet curable adhesive was prepared by mixing 40 parts by weight of N-hydroxyethylacrylamide (HEAA), 60 parts by weight of acryloylmorpholine (ACMO), and 3 parts by weight of a photoinitiator “IRGACURE 819” (manufactured by BASF).
  • HEAA N-hydroxyethylacrylamide
  • ACMO acryloylmorpholine
  • UVGACURE 819 a photoinitiator
  • ⁇ Single protective polarizing film C> Preparation of polarizer C
  • IPA copolymerized PET film amorphous isophthalic acid copolymerized polyethylene terephthalate (IPA copolymerized PET) film (thickness: 130 ⁇ m) having a water absorption of 0.75% and Tg of 75 ° C. is subjected to corona treatment.
  • Alcohol polymerization degree 4200, saponification degree 99.2 mol
  • acetoacetyl-modified PVA polymerization degree 1200, acetoacetyl modification degree 4.6%, saponification degree 99.0 mol% or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.
  • aqueous solution containing 9: 1 ratio of the trade name “Gosefimer Z200”) was applied and dried at 25 ° C. to form a PVA-based resin layer having a thickness of 11 ⁇ m, thereby preparing a laminate.
  • the obtained laminate was contracted 30% in the first direction (MD) at 110 ° C. using a simultaneous biaxial stretching machine, and at the same time, it was stretched in the air in the second direction (TD) by a factor of 5.0. (Stretching treatment).
  • the laminate was immersed for 40 seconds in an iodine aqueous solution (iodine concentration: 0.2 wt%, potassium iodide concentration: 1.4 wt%) at 25 ° C. (dyeing treatment).
  • the layered product after dyeing was immersed in a 60 ° C. boric acid aqueous solution (boric acid concentration: 5% by weight, potassium iodide concentration: 5% by weight) for 80 seconds (crosslinking treatment).
  • the laminate was immersed in a 25 ° C. aqueous potassium iodide solution (potassium iodide concentration: 5% by weight) for 20 seconds (cleaning treatment).
  • cleaning treatment As a result, an optical film laminate including a polarizer having a thickness of 3 ⁇ m was obtained.
  • a protective film (thickness: 40 ⁇ m, manufactured by Fuji Film, trade name “Z-TAC ZRD40SL”) was bonded to the polarizer side of the laminate through a vinyl alcohol adhesive. Subsequently, the amorphous PET base material was peeled off to produce a piece protective polarizing film C using a thin polarizer.
  • the optical properties of the obtained piece-protecting polarizing film C were a transmittance of 38.4% and a degree of polarization of 99.99%.
  • ⁇ Preparation of single protective polarizing film D> (Preparation of polarizer D (12 ⁇ m thick polarizer))
  • polarizer D (12 ⁇ m thick polarizer) A polyvinyl alcohol film having an average polymerization degree of 2400 and a saponification degree of 99.9 mol% and a thickness of 30 ⁇ m was immersed in warm water at 30 ° C. for 60 seconds to swell.
  • the thickness of the obtained polarizer was 12 ⁇ m.
  • ⁇ Forming material for transparent resin layer> (Polyvinyl alcohol-based forming material A) A polyvinyl alcohol resin having a polymerization degree of 2500 and a saponification degree of 99.0 mol% (trade name: JC-25, manufactured by Nihon Acetate / Poval) was dissolved in pure water to prepare an aqueous solution having a solid content concentration of 4% by weight. .
  • Polyvinyl alcohol-based forming material B A polyvinyl alcohol resin having a degree of polymerization of 2500 and a degree of saponification of 99.7 mol% (trade name: JC-25H, manufactured by Nippon Vinegar Poval Co., Ltd.) was dissolved in pure water to prepare an aqueous solution having a solid content concentration of 4% by weight. .
  • Polyvinyl alcohol-based forming material C A polyvinyl alcohol resin having a polymerization degree of 1700 and a saponification degree of 99.0 mol% (trade name: JC-17, manufactured by Nihon Acetate / Poval) was dissolved in pure water to prepare an aqueous solution having a solid content concentration of 4% by weight. .
  • Polyvinyl alcohol-based forming material D A polyvinyl alcohol resin having a polymerization degree of 1000 and a saponification degree of 99.0 mol% (trade name: JC-10, manufactured by Nippon Vinegar Pover Co., Ltd.) was dissolved in pure water to prepare an aqueous solution having a solid content concentration of 4% by weight. .
  • Polyvinyl alcohol-based forming material E A polyvinyl alcohol resin having a degree of polymerization of 500 and a saponification degree of 99.0 mol% (trade name: JC-05, manufactured by Nihon Acetate / Poval) was dissolved in pure water to prepare an aqueous solution having a solid content concentration of 4% by weight. .
  • Polyvinyl alcohol-based forming material F A polyvinyl alcohol resin having a degree of polymerization of 2500 and a degree of saponification of 98.0 mol% (trade name: JF-2500, manufactured by Nippon Acetate / Poval) was dissolved in pure water to prepare an aqueous solution having a solid content concentration of 4% by weight. .
  • Polyvinyl alcohol-based forming material G A polyvinyl alcohol resin having a polymerization degree of 2500 and a saponification degree of 96.0 mol% (trade name: JM-2500, manufactured by Nippon Vinegar Poval Co., Ltd.) was dissolved in pure water to prepare an aqueous solution having a solid content concentration of 4% by weight. .
  • Polyvinyl alcohol-based forming material I 100 parts of acetoacetyl group-modified PVA (polymerization degree 1200, acetoacetyl modification degree 4.6%, saponification degree 99.0 mol%, manufactured by Nippon Gosei Kagaku Kogyo Co., Ltd., trade name “Gosefimer Z200”)) and methylol 5 parts of melamine (manufactured by DIC, trade name “Watersol: S-695”) was dissolved in pure water to prepare an aqueous solution having a solid content of 4% by weight.
  • Polyvinyl alcohol-based forming material J 100 parts of acetoacetyl group-modified PVA (polymerization degree 1200, acetoacetyl modification degree 4.6%, saponification degree 99.0 mol%, manufactured by Nippon Gosei Kagaku Kogyo Co., Ltd., trade name “Gosefimer Z200”)) and methylol 20 parts of melamine (manufactured by DIC, trade name “Watersol: S-695”) was dissolved in pure water to prepare an aqueous solution having a solid content of 4% by weight.
  • Polyvinyl alcohol forming material K A carbonyl group-modified polyvinyl alcohol resin (trade name “DC-17”, manufactured by Nippon Vinegar Poval Co., Ltd.) was dissolved in pure water to prepare an aqueous solution having a solid content of 4% by weight.
  • Polyvinyl alcohol-based forming material L 100 parts of carbonyl group-modified polyvinyl alcohol resin (product name “DC-17”, manufactured by Nippon Vineyard Pover Co., Ltd.) and 10 parts of dihydrazine (adipic acid dihydrazide) are dissolved in pure water, and the solid content concentration is 4% by weight. An aqueous solution of was prepared.
  • Polyvinyl alcohol-based forming material M A polyvinyl alcohol resin having a polymerization degree of 2000 and a saponification degree of 99.4 mol% (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name “NH-20”) was dissolved in pure water to prepare an aqueous solution having a solid content concentration of 4% by weight. .
  • Polyvinyl alcohol-based forming material N A polyvinyl alcohol resin having a polymerization degree of 1700 and a saponification degree of 97.0 mol% (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name “AH-17”) was dissolved in pure water to prepare an aqueous solution having a solid content concentration of 4% by weight. .
  • Polyvinyl alcohol-based forming material O A polyvinyl alcohol resin having a polymerization degree of 1700 and a saponification degree of 99.0 mol% (trade name “PVA117” manufactured by Kuraray Co., Ltd.) was dissolved in pure water to prepare an aqueous solution having a solid content concentration of 4% by weight.
  • Polyvinyl alcohol-based forming material P A polyvinyl alcohol resin having a degree of polymerization of 4000 and a degree of saponification of 99.0 mol% (trade name: JC-40, manufactured by Nippon Acetate / Poval) was dissolved in pure water to prepare an aqueous solution having a solid content concentration of 4% by weight. .
  • Polyvinyl alcohol-based forming material Q A polyvinyl alcohol resin having a polymerization degree of 1700 and a saponification degree of 96.0 mol% (trade name: JM-17, manufactured by Nihon Acetate / Poval) was dissolved in pure water to prepare an aqueous solution having a solid content concentration of 4% by weight. .
  • Polyvinyl alcohol-based forming material R A polyvinyl alcohol resin having a polymerization degree of 1400 and a saponification degree of 88.0 mol% (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name “GM-14”) was dissolved in pure water to prepare an aqueous solution having a solid content concentration of 4% by weight. .
  • Polyvinyl alcohol-based forming material S A polyvinyl alcohol resin having a polymerization degree of 1300 and a saponification degree of 93.0 mol% (trade name “PVA613” manufactured by Kuraray Co., Ltd.) was dissolved in pure water to prepare an aqueous solution having a solid content concentration of 4% by weight.
  • Polyvinyl alcohol forming material T A polyvinyl alcohol resin having a polymerization degree of 1700 and a saponification degree of 94.5 mol% (trade name “PVA617” manufactured by Kuraray Co., Ltd.) was dissolved in pure water to prepare an aqueous solution having a solid content concentration of 4% by weight.
  • Polyvinyl alcohol-based forming material U A polyvinyl alcohol resin having a degree of polymerization of 3300 and a degree of saponification of 94.0 mol% (manufactured by Nihon Acetate / Poval, trade name: JM-33) was dissolved in pure water to prepare an aqueous solution having a solid content concentration of 4% by weight. .
  • Polyvinyl alcohol-based forming material V A polyvinyl alcohol resin having a polymerization degree of 500 and a saponification degree of 94.5 mol% (trade name: JT-05, manufactured by Nihon Acetate / Poval) was dissolved in pure water to prepare an aqueous solution having a solid content concentration of 4% by weight. .
  • cross-linking agent 100 parts by weight of the solid content of the acrylic polymer solution is a cross-linking agent mainly composed of a compound having an isocyanate group of 0.5 part (trade name “Coronate L” manufactured by Nippon Polyurethane Co., Ltd.). And 0.075 parts of ⁇ -glycidoxypropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name “KMB-403”) as a silane coupling agent in this order, was prepared.
  • the pressure-sensitive adhesive solution was applied to the surface of a release sheet (separator) made of a polyethylene terephthalate film (thickness 38 ⁇ m) subjected to a release treatment so that the thickness after drying was 25 ⁇ m and dried to form a pressure-sensitive adhesive layer. Formed.
  • Example 1 Manufacturing a single protective polarizing film with a transparent resin layer>
  • the thickness after drying the above-mentioned forming material A adjusted to 25 ° C. with a wire bar coater on the surface of the polarizer of the piece protective polarizing film A (polarizer surface not provided with a transparent protective film) is 1 ⁇ m. After coating, it was dried with hot air at 60 ° C. for 1 minute to produce a piece protective polarizing film with a transparent resin layer.
  • Example 2 Comparative Examples 1 to 7
  • the single transmittance T and polarization degree P of the obtained piece-protecting polarizing film were measured using a spectral transmittance measuring device with an integrating sphere (Dot-3c, Murakami Color Research Laboratory).
  • the degree of polarization P is the transmittance when two identical polarizing films are overlapped so that their transmission axes are parallel (parallel transmittance: Tp), and overlapped so that their transmission axes are orthogonal to each other. It is calculated
  • Polarization degree P (%) ⁇ (Tp ⁇ Tc) / (Tp + Tc) ⁇ 1/2 ⁇ 100
  • Each transmittance is represented by a Y value obtained by correcting visibility with a two-degree field of view (C light source) of JIS Z8701, with 100% of the completely polarized light obtained through the Granteller prism polarizer.
  • FTIR Fourier transform infrared spectrophotometer
  • SPECTRUM2000 the total reflection attenuation spectroscopy using the polarized light as the measurement light for the polarizers obtained in the examples and comparative examples
  • the intensity of the boric acid peak (665 cm ⁇ 1 ) and the intensity of the reference peak (2941 cm ⁇ 1 ) were measured by ATR) measurement.
  • the boric acid content index was calculated from the obtained boric acid peak intensity and the reference peak intensity by the following formula, and the boric acid content (% by weight) was determined from the calculated boric acid index by the following formula.
  • the measurement sample may be a powder of the raw material itself, or may be a PVA film obtained by applying an aqueous PVA solution (solid content 4%) to a PET film so that the dry film thickness is several ⁇ m and drying.
  • the measurement sample was aged for 24 hours in an environment of 23 ° C. and 50% RH, and 3 mg of the obtained sample was put into a DSC sample pan to measure DSC. The measurement conditions are shown below.
  • ⁇ Pot life of transparent resin layer forming material The viscosity (cps) of the forming material (aqueous solution) was measured at 23 ° C. liquid temperature and air temperature using a rheometer RS1 (manufactured by Haake) and model 222-1267 as a coaxial cylinder.
  • the viscosity X immediately after preparing the forming material (aqueous solution) and the viscosity Y after 6 hours from the preparation were measured. On the basis of the viscosity X, the case where the viscosity Y was 2 times or less was evaluated as “ ⁇ ”, and the case where it exceeded 2 times was evaluated as “x”.
  • a base molding material made of low density polyethylene having a density of 0.924 g / cm 3 and a melt flow rate at 190 ° C. of 2.0 g / 10 min was supplied to a coextrusion inflation molding machine.
  • a surface protective film consisting of a 33 ⁇ m thick base material layer and a 5 ⁇ m thick adhesive layer was produced.
  • the release sheet (separator) is peeled from the sample, and the glass plate 20 is interposed through the exposed adhesive layer 4. Pasted on top.
  • a load of 200 g is applied to the central portion of the sample 11 (surface protective film 6 side) by a guitar pick (manufactured by HISTROY, model number “HP2H (HARD)”), and the absorption axis of the polarizer 1 in the sample 11 is applied.
  • the load load of 50 reciprocations was repeated at a distance of 100 mm in the orthogonal direction. The load was applied at one place.
  • B 1 to 100 pieces.
  • C 101 or more.
  • the obtained piece protective polarizing film 10 was cut into a size of 50 mm ⁇ 150 mm (the direction of the absorption axis was 50 mm).
  • the sample 10 was used by bonding the test surface protective film 6 to the transparent protective film 2 side.
  • two glass support bases 21 having a width of 25 mm and a height of 5 mm are arranged on a glass plate 20 with an inner space of 15 mm. It was installed in parallel so that The longitudinal direction of the two glass supports and the direction perpendicular to the absorption axis of the polarizer 1 in the cut sample 10 are parallel to each other, and both sides of the sample 11 are evenly placed on the two glass supports. Sample 10 was placed so as to hang. In the sample 10, the surface protective film 6 was disposed on the upper side.
  • a load of 100 g is applied to the central portion of the sample 10 (surface protective film 6 side) by a guitar pick (manufactured by HISTROY, model number “HP2H (HARD)”), and the absorption axis of the polarizer 1 in the sample 11 is applied.
  • the surface of the polarizer 1 was scratched by repeating a load load of 10 reciprocations at a distance of 100 mm in the orthogonal direction. The load was applied at one place. It was visually confirmed whether or not nano slits were generated.
  • the thickness of the polarizer of Comparative Examples 2 and 4 exceeded 10 ⁇ m, the shrinkage stress inside the polarizer was large, so the film was broken when nano slits were generated in the rock and roll test. Therefore, it could not be evaluated.
  • FIG. 7 shows the following index for confirming the crack of light leakage (nano slit a) in the guitar pick test and the rock and roll test of the piece protective polarizing film 10 or the piece protective polarizing film 11 with a transparent resin layer. It is an example of the photograph of the microscope of a film surface. In FIG. 7A, no light leakage crack due to the nano slit a is confirmed. The state as shown in FIG. 7A is before heating of the guitar pick test of the comparative example, before heating of the rock and roll test of the example, and after heating of the rock and roll test of the example (because of the expansion suppression effect, the nano slit Does not fall out). On the other hand, FIG.
  • FIG. 7B shows a case where three cracks of light leakage due to the nano slits a are generated in the absorption axis direction of the polarizer by heating.
  • the state as shown in FIG. 7B corresponds to after heating of the guitar pick test of the comparative example and after heating of the rock and roll test of the comparative example.
  • the sample in which the nano slit was generated was observed with a differential interference microscope.
  • the sample without nano slits was set to cross Nicole on the lower side (transmission light source side) of the sample where nano slits were generated and observed with transmitted light. .
  • ⁇ Confirmation of penetration crack heat shock test> The obtained polarizing film with a pressure-sensitive adhesive layer was cut into 50 mm ⁇ 150 mm (absorption axis direction is 50 mm) and 150 mm ⁇ 50 mm (absorption axis direction is 150 mm), and crossed Nicols on both sides of 0.5 mm-thick alkali-free glass. A sample was made by laminating in the direction. The sample was subjected to a heat shock of ⁇ 40 to 85 ° C. for 30 minutes ⁇ 100 times in each environment, and then taken out to visually check whether a through-crack (number) was generated in the polarizing film with the adhesive layer. Confirmed. This test was performed five times. Evaluation was performed according to the following. ⁇ : No through crack. X: There is a through crack.
  • FIG. 8 is an example of a microphotograph of the surface of the polarizing film, which serves as an index for confirming the penetration crack b of the piece protective polarizing film 10 or the piece protective polarizing film 11 with a transparent resin layer.
  • the sample in which the through crack was generated was observed with a differential interference microscope.
  • the degree of polarization P is the transmittance when two identical polarizing films are overlapped so that their transmission axes are parallel (parallel transmittance: Tp), and overlapped so that their transmission axes are orthogonal to each other. It is calculated
  • Polarization degree P (%) ⁇ (Tp ⁇ Tc) / (Tp + Tc) ⁇ 1/2 ⁇ 100
  • Each transmittance is represented by a Y value obtained by correcting visibility with a two-degree field of view (C light source) of JIS Z8701, with 100% of the completely polarized light obtained through the Granteller prism polarizer.
  • the optical characteristics represented by the single transmittance T and the polarization degree P are expressed by the following formula, P> ⁇ (10 0.929T-42.4 ⁇ 1) ⁇ 100 (however, If the condition of T ⁇ 42.3) or P ⁇ 99.9 (however, T ⁇ 42.3) is not satisfied, the problem of the present application (occurrence of through cracks and nano slits) did not occur. .
  • Example 34 Using a long film as a single protective polarizing film, coating a polyvinyl alcohol-based forming material using a micro gravure coater, long film as the release sheet (separator) and the following surface protective film Example 1 is the same as Example 1 except that the above are used.
  • the wound body of the piece protective polarizing film with the transparent resin layer corresponds to the short side and the long side of the 32-inch non-alkali glass by slit processing in which the cutting proceeds by continuous conveyance of the piece protective polarizing film with the transparent resin layer, respectively.
  • the thing of the width to do was prepared as a set.
  • the piece protection with a transparent resin layer continuously supplied from a set of wound pieces of a piece protection polarizing film with a transparent resin layer The polarizing film was continuously bonded to both sides of 100 sheets of 0.5 mm thick 32 inch non-alkali glass so as to have a crossed Nicols relationship.
  • Example 35-37 Each is the same as Example 34 except that the piece-protecting polarizing film with a transparent resin layer was produced in the same manner as in Examples 2, 3, and 4, respectively.

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

Abstract

L'invention concerne un film polarisant protégé sur une face et comportant un élément polarisant ainsi qu'un film protecteur transparent disposés sur une seule de ses surfaces. L'élément polarisant inclut une résine à base de poly(alcool vinylique), il possède une épaisseur de 10 μm ou moins, et il est conçu de telle sorte que les caractéristiques optiques représentées par son propre facteur de transmission T et le degré de polarisation P soient conformes au rapport P > -(100,929T - 42,4 -1) × 100 (où T < 42,3) ou P ≥ 99,9 (T ≥ 42,3). De plus, l'élément polarisant a, sur l'autre surface, une couche de résine transparente qui possède une épaisseur de 0,2 µm ou plus et qui est constituée d'un matériau de formation de couche incluant une résine à base de poly(alcool vinylique). Bien qu'il inclue un élément polarisant qui possède les caractéristiques optiques données et une épaisseur de 10 µm ou moins, le film polarisant protégé sur une face ne risque pas de présenter de craquelures ou de nanofentes de perçage.
PCT/JP2015/077576 2014-09-30 2015-09-29 Film polarisant protégé sur une face, film polarisant doté d'une couche adhésive sensible à la pression, dispositif d'affichage d'image, et procédé de production continue associé WO2016052536A1 (fr)

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KR1020177008777A KR101844935B1 (ko) 2014-09-30 2015-09-29 편보호 편광 필름, 점착제층이 부착된 편광 필름, 화상 표시 장치 및 그 연속 제조 방법
CN201580053067.4A CN107076909B (zh) 2014-09-30 2015-09-29 单侧保护偏振膜、带粘合剂层的偏振膜、图像显示装置及其连续制造方法
SG11201706375PA SG11201706375PA (en) 2014-09-30 2015-09-29 One-side-protected polarizing film, pressure-sensitive-adhesive-layer-attached polarizing film, image display device, and method for continuously producing same
US15/515,887 US10061066B2 (en) 2014-09-30 2015-09-29 One-sided-protected polarizing film, pressure-sensitive-adhesive-layer-attached polarizing film, image display device, and method for continuously producing same

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JP2014-202623 2014-09-30
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JP2015189278A JP6077620B2 (ja) 2014-09-30 2015-09-28 片保護偏光フィルム、粘着剤層付偏光フィルム、画像表示装置およびその連続製造方法

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09104478A (ja) * 1995-10-09 1997-04-22 Nippon Synthetic Chem Ind Co Ltd:The 吸水用シートおよび吸水用袋
WO2011125958A1 (fr) * 2010-03-31 2011-10-13 住友化学株式会社 Film stratifié de polarisation, plaque de polarisation et procédé de fabrication de ces derniers
JP2013254072A (ja) * 2012-06-06 2013-12-19 Nitto Denko Corp 偏光板、光学フィルムおよび画像表示装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09104478A (ja) * 1995-10-09 1997-04-22 Nippon Synthetic Chem Ind Co Ltd:The 吸水用シートおよび吸水用袋
WO2011125958A1 (fr) * 2010-03-31 2011-10-13 住友化学株式会社 Film stratifié de polarisation, plaque de polarisation et procédé de fabrication de ces derniers
JP2013254072A (ja) * 2012-06-06 2013-12-19 Nitto Denko Corp 偏光板、光学フィルムおよび画像表示装置

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