WO2022138062A1 - Polarizing plate set and liquid crystal panel - Google Patents
Polarizing plate set and liquid crystal panel Download PDFInfo
- Publication number
- WO2022138062A1 WO2022138062A1 PCT/JP2021/044423 JP2021044423W WO2022138062A1 WO 2022138062 A1 WO2022138062 A1 WO 2022138062A1 JP 2021044423 W JP2021044423 W JP 2021044423W WO 2022138062 A1 WO2022138062 A1 WO 2022138062A1
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- WO
- WIPO (PCT)
- Prior art keywords
- polarizing plate
- liquid crystal
- crystal cell
- layer
- side polarizing
- Prior art date
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Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
Definitions
- the present invention relates to a polarizing plate set and a liquid crystal panel.
- a liquid crystal panel in which polarizing plates are arranged on the visual side and the back side of the liquid crystal cell is used. It is known that a liquid crystal panel may warp when used in a high temperature environment (Patent Documents 1 and 2).
- Patent Document 1 the warp of the liquid crystal panel in a high temperature environment is reduced by satisfying a predetermined formula for the tensile elastic modulus of the protective layer in the polarizing plate on the side warped in the concave shape in the polarizing plate set.
- a predetermined formula for the tensile elastic modulus of the protective layer in the polarizing plate on the side warped in the concave shape in the polarizing plate set has been proposed.
- the distance from the surface far from the front plate of the polarizing plate of the front plate integrated polarizing plate to the liquid crystal cell is set to the distance from the surface close to the front plate side of the polarizing element of the back side polarizing plate to the liquid crystal cell. It has been proposed to reduce the warpage of the liquid crystal panel in a high temperature environment by making it larger than the distance.
- Patent Document 3 in order to reduce the warp of the liquid crystal panel that occurs during pressure defoaming, a value calculated from the thickness, elastic modulus and dimensional change rate of the splitter and the distance from the splitter to the liquid crystal cell is specified.
- a liquid crystal display device having a ratio of the above has been proposed.
- Warping occurs in a high temperature (for example, 85 ° C.) environment because the polarizing element containing the polyvinyl alcohol-based resin film, which is a component of the polarizing plate attached to the panel (hereinafter, also referred to as PVA polarizing element), shrinks due to heating. In many cases, it is to do. PVA modulators, in particular, tend to shrink significantly in the stretching direction due to heating. The warp of the liquid crystal panel caused by such a PVA polarizing element may be reduced by the polarizing plate set described in the above patent document.
- An object of the present invention is to provide a polarizing plate set in which warpage of a liquid crystal panel is suppressed.
- a polarizing plate set including a front-side polarizing plate arranged on the visible side of a liquid crystal cell and a back-side polarizing plate arranged on the back side of the liquid crystal cell.
- the front-side polarizing plate and the back-side polarizing plate include a polarizing element.
- the distance from the liquid crystal cell-side surface of the polarizing element included in the front-side polarizing plate to the liquid crystal cell-side surface of the front-side polarizing plate is L1 ( ⁇ m), and the polarizing element included in the back-side polarizing plate.
- At least one selected from the front-side polarizing plate and the back-side polarizing plate is a resin having a water permeability of 400 g / m 2.24 hr or less at a temperature of 40 ° C. and a humidity of 90% RH on the liquid crystal cell side of the polarizing element.
- a set of polarizing plates having a layer.
- [2] The polarizing plate set according to [1], wherein the sum of L1 ( ⁇ m) and L2 ( ⁇ m) is 60 ⁇ m or less. [3] The polarizing plate set according to [1] or [2], wherein the absolute value of the difference between L1 ( ⁇ m) and L2 ( ⁇ m) is 3 ⁇ m or less. [4] The polarizing plate set according to any one of [1] to [3], wherein the polarizing elements contained in the front-side polarizing plate and the back-side polarizing plate have substantially the same thickness.
- Both the front-side polarizing plate and the back-side polarizing plate are resins having a water permeability of 400 g / m 2.24 hr or less at the temperature of 40 ° C. and a humidity of 90% RH on the liquid crystal cell side of the polarizing element.
- the polarizing plate set according to any one of [1] to [4], which has a layer.
- Both the front-side polarizing plate and the back-side polarizing plate include any of [1] to [6] containing a triacetyl cellulose-based resin film on the opposite side of the polarizing element from the liquid crystal cell.
- the described polarizing plate set [8] A liquid crystal panel comprising the polarizing plate set according to any one of [1] to [7] and a liquid crystal cell.
- the polarizing plate set 1 shown in FIG. 1 is composed of a front-side polarizing plate 100 arranged on the visible side of the liquid crystal cell 300 and a back-side polarizing plate 200 arranged on the back surface side of the liquid crystal cell 300.
- the front side polarizing plate 100 and the back side polarizing plate 200 may be of the same type or different types.
- a liquid crystal panel can be manufactured by attaching a polarizing plate set to a liquid crystal cell.
- the shape of the front side polarizing plate 100 and the back side polarizing plate 200 may be, for example, a square shape, preferably a square shape having a long side and a short side, and more preferably a rectangular shape.
- the size of the front side polarizing plate 100 and the back side polarizing plate 200 is preferably a square shape (equivalent to a 32-inch type) having a long side of 660 mm or more and a short side of 370 mm or more, and a long side of 800 mm or more and 450 mm.
- a square shape (corresponding to a 40-inch type) having the above short sides is preferable.
- the size of the front side polarizing plate 100 and the back side polarizing plate 200 is preferably a square shape (equivalent to a 50-inch type) having a long side of 1000 mm or more and a short side of 550 mm or more, and a long side of 1300 mm or more.
- a square shape (corresponding to a 60-inch type) having a short side of 700 mm or more is preferable.
- the polarizing plate set 1 can be arranged in the liquid crystal cell so that the transmission axes of the front side polarizing plate 100 and the back side polarizing plate 200 are substantially perpendicular to each other.
- the angle of the transmission axis of the back side polarizing plate 200 with respect to the transmission axis of the front side polarizing plate 100 may be, for example, in the range of 90 ⁇ 5 °, preferably in the range of 90 ⁇ 1 °, and more preferably 90. It is within the range of ⁇ 0.5 °.
- the planar view shape of the front side polarizing plate 100, the back side polarizing plate 200, and the liquid crystal cell 300 may be, for example, a square shape, preferably a square shape having a long side and a short side, and more preferably a rectangle. ..
- the plan view shapes of the front-side polarizing plate 100, the back-side polarizing plate 200, and the liquid crystal cell 300 are rectangular, in the polarizing plate set 1, the absorption axis direction of the polarizing element of the front-side polarizing plate 100 is the long side direction of the liquid crystal cell.
- the absorption axis direction of the polarizing element of the back side polarizing plate 200 is substantially parallel to the short side direction of the liquid crystal cell, or the absorption axis direction of the polarizing element of the front side polarizing plate 100 may be substantially parallel to. It may be arranged so as to be substantially parallel to the short story direction of the liquid crystal cell and substantially parallel to the absorption axis direction of the polarizing element of the back side polarizing plate 200 to be substantially parallel to the long story direction of the liquid crystal cell.
- the term “nearly parallel” means that, for example, the angle formed by the absorption axis of the polarizing plate and the long side or the short side of the liquid crystal cell may be 5 ° or less, preferably 3 ° or less, and more preferably 1 ° or less.
- Both the front-side polarizing plate 100 and the back-side polarizing plate 200 include a polarizing element and a resin layer, although not shown. Further, both the front-side polarizing plate 100 and the back-side polarizing plate 200 include a pressure-sensitive adhesive layer (not shown) for bonding the front-side polarizing plate 100 and the back-side polarizing plate 200 to the liquid crystal cell.
- the front-side polarizing plate 100 and the back-side polarizing plate 200 may further include, for example, a laminated layer, a retardation layer, a protective film, and the like, in addition to the polarizing element and the resin layer described later.
- the distance from the surface of the polarizing element on the liquid crystal cell 300 side included in the front side polarizing plate 100 to the surface of the front side polarizing plate 100 on the liquid crystal cell 300 side is L1 ( ⁇ m), and the back side polarizing plate.
- L1 ( ⁇ m) the distance from the surface of the polarizing element included in the 200 on the liquid crystal cell 300 side to the surface of the backside polarizing plate 200 on the liquid crystal cell 300 side.
- moisture permeability for simplification has a resin layer (not shown) having a permeability of 400 g / m 2.24 hr or less.
- the surface of the front-side polarizing plate 100 on the liquid crystal cell 300 side and the surface of the back-side polarizing plate 200 on the liquid crystal cell 300 side are the pressure-sensitive adhesive layers (including the separate film) contained in the front-side polarizing plate 100 and the back-side polarizing plate 200. (Not) refers to the surface on the liquid crystal cell side.
- the polarizing element which is a component of the polarizing plate attached to the liquid crystal cell, is gradually absorbed in moisture when exposed to a high humidity environment for a long time, and then the backlight is turned on for a long time. It was found that the polarizing element was deformed due to the movement of water, and the liquid crystal cell was warped due to this deformation. For example, when a module for an LCD TV is transported by sea, the humidity is high at the bottom of the ship, and the polarizing plate attached to the liquid crystal cell is in a state of absorbing moisture for a long time.
- At least one of the above L1 ( ⁇ m) and L2 ( ⁇ m) is set to 35 ⁇ m or less, and at least one selected from the front-side polarizing plate and the back-side polarizing plate is a liquid crystal of a polarizing element.
- Moisture permeability is 400g / on the cell side It has been found that having a resin layer of m 2.24 hr or less tends to reduce the amount of warpage of the liquid crystal panel. It is presumed that this is because the strain energy accumulated on the liquid crystal cell side of the polarizing element can be reduced while suppressing the intrusion of water from the liquid crystal cell side of the polarizing element.
- At least one of L1 ( ⁇ m) and L2 ( ⁇ m) is preferably 30 ⁇ m or less, more preferably 25 ⁇ m or less, and further preferably 20 ⁇ m or less from the viewpoint of the amount of warpage of the liquid crystal panel.
- the amount of warpage can be measured according to the method described in the column of Examples described later.
- Both L1 ( ⁇ m) and L2 ( ⁇ m) are preferably 35 ⁇ m or less, more preferably 30 ⁇ m or less, still more preferably 25 ⁇ m or less, and particularly preferably 20 ⁇ m or less from the viewpoint of the amount of warpage of the liquid crystal panel. be.
- L1 ( ⁇ m) and L2 ( ⁇ m) are preferably 60 ⁇ m or less, more preferably 50 ⁇ m or less, and further preferably 40 ⁇ m or less from the viewpoint of the amount of warpage of the liquid crystal panel.
- L1 ( ⁇ m) and L2 ( ⁇ m) can be set to the same level in order to equalize the strain forces on the liquid crystal cells of the front-side polarizing plate and the back-side polarizing plate so that they cancel each other out.
- the absolute value of the difference between L1 ( ⁇ m) and L2 ( ⁇ m) is preferably 3 ⁇ m or less, more preferably 2 ⁇ m or less, still more preferably 1 ⁇ m or less, and particularly preferably 1 ⁇ m or less from the viewpoint of the amount of warpage of the liquid crystal panel. It is 0.
- the splitter has the property of absorbing linearly polarized light having a vibration plane parallel to its absorption axis and transmitting linear polarization having a vibration plane orthogonal to the absorption axis (parallel to the transmission axis).
- a laminated product of a polarizing element and a resin layer is also called a linear polarizing plate.
- the polarizing element can be a film in which iodine is adsorbed on a known polyvinyl alcohol-based resin.
- a step of uniaxially stretching the polyvinyl alcohol-based resin a step of adsorbing the polyvinyl alcohol-based resin by dyeing the polyvinyl alcohol-based resin with iodine, and treating the polyvinyl alcohol-based resin on which iodine is adsorbed with a boric acid aqueous solution. It can be produced through a step and a step of washing with water after treatment with an aqueous boric acid solution.
- the polyvinyl alcohol-based resin is obtained by saponifying the polyvinyl acetate-based resin.
- the polyvinyl acetate-based resin in addition to polyvinyl acetate which is a homopolymer of vinyl acetate, a copolymer of vinyl acetate and another monomer copolymerizable therewith is used.
- examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acid compounds, olefin compounds, vinyl ether compounds, unsaturated sulfone compounds, and (meth) acrylamide compounds having an ammonium group. ..
- the term "(meth) acrylic” means at least one selected from acrylic and methacrylic. The same applies to "(meth) acrylate” and the like.
- the saponification degree of the polyvinyl alcohol-based resin is usually about 85 mol% or more and 100 mol% or less, preferably 98 mol% or more.
- the polyvinyl alcohol-based resin may be modified, and polyvinyl formal, polyvinyl acetal and the like modified with aldehydes can also be used.
- the degree of polymerization of the polyvinyl alcohol-based resin is usually 1000 or more and 10000 or less, preferably 1500 or more and 5000 or less.
- the thickness of the polarizing element may be preferably 30 ⁇ m or less, more preferably 25 ⁇ m or less, still more preferably 20 ⁇ m or less, and particularly preferably 15 ⁇ m or less, from the viewpoint that the amount of water absorption is better.
- the thickness of the splitter is usually 2 ⁇ m or more, preferably 3 ⁇ m or more, and may be, for example, 5 ⁇ m or more.
- the resin layer can be arranged on one side or both sides of the polarizing element directly on the polarizing element or via a bonding layer described later, and can have a function of protecting the surface of the polarizing element, particularly the polarizing element.
- the resin layer can be an optically transparent thermoplastic resin film and coating film.
- the resin layers may be of the same type or different from each other.
- the thermoplastic resin film can be bonded to one side or both sides of the polarizing element.
- the thermoplastic resin film may be, for example, a translucent, preferably optically transparent thermoplastic resin film, and examples thereof include a chain polyolefin resin (polyethylene resin, polypropylene resin, poly).
- Polyethylene-based resins such as methylpentene-based resins), cyclic polyolefin-based resins (norbornen-based resins, etc.); Cellulosic resins such as triacetyl cellulose; Polyester-based resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate; Polycarbonate-based Resins; ethylene-vinyl acetate resin; polystyrene resin; polyamide resin; polyetherimide resin; (meth) acrylic resin such as polymethyl (meth) acrylate resin; polyimide resin; polyether sulfone resin; polysulfone system Resins; polyvinyl chloride-based resins; polyvinylidene chloride-based resins; polyvinyl alcohol-based resins; polyvinyl acetal-based resins; polyether ketone-based resins; polyether ether ketone-based resins; polyether sulfone-based resins
- thermoplastic resin can be used alone or in combination of two or more. Among them, a triacetyl cellulose-based resin film, a cyclic polyolefin-based resin film, and a (meth) acrylic-based resin film are preferable from the viewpoint of strength and translucency.
- the thermoplastic resin film may or may not have a phase difference.
- Thermoplastic resin films include plasticizers, UV absorbers, infrared absorbers, colorants such as pigments and dyes, optical brighteners, dispersants, heat stabilizers, light stabilizers, antistatic agents, antioxidants, as required. It may contain an agent, a lubricant, or the like.
- the thickness of the thermoplastic resin film may be, for example, 60 ⁇ m or less, preferably 50 ⁇ m or less, and more preferably 40 ⁇ m or less from the viewpoint of reducing the distance between the polarizing element and the liquid crystal cell. Further, it is usually 1 ⁇ m or more, preferably 5 ⁇ m or more, and more preferably 15 ⁇ m or more.
- a surface treatment layer such as a hard coat layer, an antireflection layer, and an antistatic layer can be formed on the surface of the thermoplastic resin film opposite to the polarizing element.
- the hardcoat layer can be formed from a cured product of a composition for forming a hardcoat layer containing an active energy ray-curable resin.
- the ultraviolet curable resin include acrylic resins, silicone resins, polyester resins, urethane resins, amide resins, epoxy resins and the like.
- the hardcourt layer may contain additives to improve its strength. Additives are not limited, and include inorganic fine particles, organic fine particles, or mixtures thereof.
- the resin layer which is a coating film, is cured by applying a coating composition such as a composition used for the above-mentioned hard coat layer, a cationically curable composition such as an epoxy resin, or a radical curable composition such as (meth) acrylate. It may be a layer made of plastic. Further, the resin layer as a coating film may be a layer formed by using an aqueous solution of a polyvinyl alcohol-based resin or the like as a coating composition, applying the aqueous solution to the surface of the polarizing element, and drying the resin layer.
- a coating composition such as a composition used for the above-mentioned hard coat layer, a cationically curable composition such as an epoxy resin, or a radical curable composition such as (meth) acrylate. It may be a layer made of plastic.
- the resin layer as a coating film may be a layer formed by using an aqueous solution of a polyvinyl alcohol-based resin or the like as a coating
- the resin layer which is a coating film, may be a plasticizer, an ultraviolet absorber, an infrared absorber, a colorant such as a pigment or a dye, a fluorescent whitening agent, a dispersant, a heat stabilizer, a light stabilizer, an antistatic agent, if necessary. It may contain an antioxidant, a lubricant and the like.
- the thickness of the resin layer as the coating film may be, for example, 30 ⁇ m or less, preferably 25 ⁇ m or less, more preferably 20 ⁇ m or less, still more preferably 15 ⁇ m, and particularly preferably 10 ⁇ m.
- the thickness of the resin layer as the coating film may be, for example, 0.1 ⁇ m or more.
- At least one of the front-side polarizing plate 100 and the back-side polarizing plate 200 has a resin layer having a moisture permeability of 400 g / m 2.24 hr or less (hereinafter, a low-moisture-permeable resin layer for simplification) on the liquid crystal cell side of the polarizing element. Also called).
- the moisture permeability can be measured according to the method described in the column of Examples described later.
- the low moisture permeability resin layer preferably has a moisture permeability of 300 g / m 2.24 hr or less, more preferably 200 g / m 2.24 hr or less, and further preferably 100 g / m 2 .
- - contains a resin layer of 24 hr or less, particularly preferably 80 g / m 2.24 hr or less.
- the low moisture permeability resin layer may be, for example, 10 g / m 2.24 hr or more, preferably 30 g / m 2.24 hr or more.
- both the front side polarizing plate 100 and the back side polarizing plate 200 include a low moisture permeability resin layer.
- the low-moisture-permeable resin layers may be of the same type or different from each other.
- the low moisture permeability resin layer is a layer containing a stretched thermoplastic resin film, a coating film prepared by a casting method, a cured product of a photocurable resin composition, or the like, in addition to the above-mentioned thermoplastic resin film and coating film. It may be there.
- the low moisture permeability resin layer is preferably a thermoplastic resin film made of a resin containing cyclic polyolefin as a main monomer.
- the laminating layer can be a layer for laminating the polarizing element and the resin layer.
- the laminating layer can be formed from an adhesive or adhesive.
- the adhesive include an active energy ray-curable adhesive such as an ultraviolet curable adhesive, an aqueous solution of a polyvinyl alcohol-based resin or an aqueous solution containing a cross-linking agent, and a water-based adhesive such as a urethane-based emulsion adhesive. be able to.
- the adhesives forming the two bonding layers may be of the same type or different types.
- the ultraviolet curable adhesive may be a mixture of a radically polymerizable (meth) acrylic compound and a photoradical polymerization initiator, a mixture of a cationically polymerizable epoxy compound and a photocationic polymerization initiator, and the like.
- a cationically polymerizable epoxy compound and a radically polymerizable (meth) acrylic compound may be used in combination, and a photocationic polymerization initiator and a photoradical polymerization initiator may be used in combination as an initiator.
- the thickness of the adhesive may be, for example, 0.1 ⁇ m or more and 5 ⁇ m or less.
- the adhesive When using an active energy ray-curable adhesive, the adhesive is cured by irradiating it with active energy rays after bonding.
- the light source of the active energy ray is not particularly limited, but an active energy ray (ultraviolet ray) having a emission distribution at a wavelength of 400 nm or less is preferable, and specifically, a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a chemical lamp, Black light lamps, microwave-excited mercury lamps, metal halide lamps and the like are preferably used.
- At least one bonding surface of the polarizing element and the thermoplastic resin film is corona-treated.
- Surface treatments such as flame treatment, plasma treatment, ultraviolet irradiation treatment, primer coating treatment, and saponification treatment may be performed.
- the thickness of the bonded layer may be, for example, 0.01 ⁇ m or more and 10 ⁇ m.
- a pressure-sensitive pressure-sensitive adhesive (hereinafter, also referred to as a pressure-sensitive adhesive) can be used.
- the pressure-sensitive adhesive can be composed of a pressure-sensitive adhesive composition containing a resin as a main component, such as (meth) acrylic, rubber, urethane, ester, silicone, and polyvinyl ether.
- a pressure-sensitive adhesive composition using a (meth) acrylic resin as a base polymer is preferable from the viewpoint of transparency, weather resistance, heat resistance and storage elastic modulus.
- the pressure-sensitive adhesive composition may be an active energy ray-curable type or a thermosetting type.
- Examples of the (meth) acrylic resin (base polymer) used in the pressure-sensitive adhesive composition include butyl (meth) acrylate, ethyl (meth) acrylate, isooctyl (meth) acrylate, and 2- (meth) acrylate.
- a polymer or copolymer having one or more (meth) acrylic acid esters such as ethylhexyl as a monomer is preferably used. It is preferable that the base polymer is copolymerized with a polar monomer.
- Examples of the polar monomer include (meth) acrylic acid, 2-hydroxypropyl (meth) acrylic acid, hydroxyethyl (meth) acrylic acid, (meth) acrylamide, N, N-dimethylaminoethyl (meth) acrylate, and glycidyl ( Examples thereof include monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group and the like, such as meth) acrylate.
- the pressure-sensitive adhesive composition may contain only the above-mentioned base polymer, but usually further contains a cross-linking agent.
- the cross-linking agent is a divalent or higher metal ion that forms a carboxylic acid metal salt with a carboxyl group; a polyamine compound that forms an amide bond with a carboxyl group; poly.
- Epoxy compounds and polyols that form an ester bond with a carboxyl group; polyisocyanate compounds that form an amide bond with a carboxyl group are exemplified. Of these, polyisocyanate compounds are preferable.
- the bonding layer is formed from a pressure-sensitive adhesive
- the pressure-sensitive adhesive composition is dissolved or dispersed in an organic solvent such as toluene or ethyl acetate to prepare a pressure-sensitive adhesive solution, which is directly applied to the bonded surface.
- an organic solvent such as toluene or ethyl acetate
- This can be done by a method of forming the pressure-sensitive adhesive layer, a method of forming the pressure-sensitive adhesive layer in the form of a sheet on a separate film that has been subjected to a mold release treatment, and a method of transferring the pressure-sensitive adhesive layer to the bonding surface.
- the separate film can be a film made of a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester resin such as polyethylene terephthalate, or the like. Of these, a stretched film of polyethylene terephthalate is preferable.
- the pressure-sensitive adhesive may contain optional components such as glass fibers, glass beads, resin beads, fillers composed of metal powder and other inorganic powders, pigments, colorants, antioxidants, ultraviolet absorbers, antistatic agents and the like. can.
- the antistatic agent examples include ionic compounds, conductive fine particles, conductive polymers and the like, and ionic compounds are preferably used.
- the cation component constituting the ionic compound may be an inorganic cation or an organic cation.
- the organic cation examples include pyridinium cation, imidazolium cation, ammonium cation, sulfonium cation, phosphonium cation, piperidinium cation, pyrrolidinium cation and the like, and examples of the inorganic cation include lithium ion and potassium ion.
- the anion component constituting the ionic compound may be an inorganic anion or an organic anion, but an anion component containing a fluorine atom is preferable because it provides an ionic compound having excellent antistatic performance.
- anion components containing a fluorine atom hexafluorophosphate anion [(PF 6- ) ], bis (trifluoromethanesulfonyl) imide anion [(CF 3 SO 2 ) 2 N- ] anion, bis (fluorosulfonyl) imide anion [ (FSO 2 ) 2 N- ] Anions and the like can be mentioned.
- the thickness of the bonding layer formed from the pressure-sensitive adhesive may be, for example, 30 ⁇ m or less, preferably 25 ⁇ m or less, and more preferably 20 ⁇ m or less.
- the thickness of the bonding layer formed from the pressure-sensitive adhesive may be, for example, 1 ⁇ m or more, preferably 2 ⁇ m or more, and more preferably 3 ⁇ m or more.
- the bonded surface may be subjected to surface treatment such as corona treatment, flame treatment, plasma treatment, ultraviolet irradiation treatment, primer coating treatment, saponification treatment and the like.
- the pressure-sensitive adhesive layer can have a function of bonding the front side polarizing plate 100 and the back side polarizing plate 200 to the liquid crystal cell 300.
- a conventionally known pressure-sensitive adhesive can be used without particular limitation, and the pressure-sensitive adhesive exemplified in the above-mentioned bonding layer can be used. Further, it may be an active energy ray-curable pressure-sensitive adhesive, a thermosetting pressure-sensitive adhesive, or the like.
- the pressure-sensitive adhesive layer can have a separate film.
- the front-side polarizing plate 100 and the back-side polarizing plate 200 can include a retardation layer between the polarizing element and the liquid crystal cell.
- the retardation layer may be a single layer, or may be a retardation layer laminate composed of two or more retardation layers.
- the retardation layer can be laminated on a polarizing element or a linear polarizing plate via the above-mentioned bonding layer.
- the retardation layer can be a positive A layer such as a ⁇ / 4 layer or a ⁇ / 2 layer, and a positive C layer.
- the retardation layer may be formed from a liquid crystal cured layer containing a cured product of a polymerizable liquid crystal compound, or may be formed from a resin film exemplified as a material for the above-mentioned thermoplastic resin film.
- the film-like retardation layer 130 may further include an alignment layer and a base material.
- the retardation layer preferably includes a ⁇ / 4 layer, more preferably a ⁇ / 4 layer, and at least one of a ⁇ / 2 layer and a positive C layer.
- the retardation layer includes a ⁇ / 2 layer, it can be laminated so as to be a ⁇ / 2 layer and a ⁇ / 4 layer in order from the splitter side.
- the retardation layer contains a positive C layer, the layers may be laminated so as to be a ⁇ / 4 layer and a positive C layer in order from the splitter side, or to be a positive C layer and a ⁇ / 4 layer in order from the splitter side. It may be laminated on.
- the thickness of the retardation layer may be, for example, 0.1 ⁇ m or more and 50 ⁇ m or less, preferably 1 ⁇ m or more and 30 ⁇ m or less, and more preferably 0.5 ⁇ m or more and 15 ⁇ m or less.
- the front side polarizing plate 100 and the back side polarizing plate 200 may have a protective film on the side opposite to the liquid crystal cell 300.
- the protective film can be peeled off together with the pressure-sensitive adhesive layer that the polarizing plate is attached to, for example, a liquid crystal cell or another optical member.
- the protect film is composed of, for example, a base film and an adhesive layer laminated on the base film.
- the resin constituting the base film is, for example, a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester resin such as polyethylene terephthalate or polyethylene naphthalate, or a thermoplastic resin such as a polycarbonate resin. be able to.
- a polyester resin such as polyethylene terephthalate is preferable.
- the thickness of the protective film is not particularly limited, but is preferably in the range of, for example, 20 ⁇ m or more and 200 ⁇ m or less.
- the thickness of the base material is 20 ⁇ m or more, strength tends to be easily imparted to the front-side polarizing plate 100 and the back-side polarizing plate 200.
- the polarizing plate set 2 shown in FIG. 2 is composed of a front-side polarizing plate 101 arranged on the visible side of the liquid crystal cell 300 and a back-side polarizing plate 201 arranged on the back surface side of the liquid crystal cell 300.
- the front-side polarizing plate 101 and the back-side polarizing plate 201 include the modulators 130 and 230, respectively.
- the front-side polarizing plate 101 further includes a resin layer 110, a low-moisture-permeable resin layer 150, a bonding layer 120, 140, and an adhesive layer 160.
- the back surface side polarizing plate 201 further includes a resin layer 210, a low moisture permeability resin layer 250, a bonding layer 220, 240, and an adhesive layer 260.
- the front-side polarizing plate and the back-side polarizing plate can be manufactured, for example, by laminating each layer with a laminating layer.
- a surface activation treatment such as corona treatment to one or both of the bonded surfaces in order to improve the adhesion.
- the adhesive layer can be prepared as an adhesive sheet.
- a pressure-sensitive adhesive composition is prepared by dissolving or dispersing the pressure-sensitive adhesive composition in an organic solvent such as toluene or ethyl acetate, and a layer made of the pressure-sensitive adhesive is formed on a release film which has been subjected to a mold release treatment. It can be produced by forming it into a sheet shape and laminating another release film on the pressure-sensitive adhesive layer.
- the pressure-sensitive adhesive sheet from which one release film has been peeled off is attached to one layer (for example, a polarizing plate), then the other release film is peeled off, and each layer is attached by the method of attaching the other layer (for example, a liquid crystal cell). can do.
- one layer for example, a polarizing plate
- the other release film is peeled off, and each layer is attached by the method of attaching the other layer (for example, a liquid crystal cell).
- the release film is preferably composed of a plastic film and a release layer.
- the plastic film include polyester films such as polyethylene terephthalate film, polybutylene terephthalate film, and polyethylene naphthalate film, and polyolefin films such as polypropylene film.
- the release layer can be formed from, for example, a composition for forming a release layer.
- the main component (resin) constituting the release layer forming composition is not particularly limited, and examples thereof include silicone resin, alkyd resin, acrylic resin, and long-chain alkyl resin.
- the liquid crystal cell has two cell substrates and a liquid crystal layer sandwiched between the substrates.
- the cell substrate is generally made of glass, but may be a plastic substrate.
- the liquid crystal cell itself used in the liquid crystal panel of the present invention shall be composed of various types used in this field (for example, known drive modes such as IPS mode, VA mode, TN mode, etc.). Can be done.
- a liquid crystal panel can be manufactured by adhering a polarizing plate to a liquid crystal cell via an adhesive layer.
- a glass panel in which two polarizing plates prepared in Examples and Comparative Examples were bonded to a glass cell was left for 72 hours under the conditions of a temperature of 25 ° C. and a humidity of 90%, and then left at room temperature for 1 hour. Further, it was left for 24 hours under the conditions of a temperature of 40 ° C. and a humidity of 55%.
- the polarizing plate on the front side was placed on the measuring table of a two-dimensional measuring instrument (NEXIV VMR-12072, manufactured by Nikon Corporation) with the polarizing plate on the upper side.
- the surface of the measuring table was focused, and the four corners of the glass panel, the center of each of the four sides, and the center of the glass panel surface were focused on the surface of the measuring table.
- the distance from the measuring table was calculated as the longest absolute value.
- the warp that the edge of the panel warped on the visible side of the glass panel was regarded as a positive warp, and the warp that the edge of the panel warped on the back side was regarded as a negative warp.
- Two measurement samples were prepared for each of the examples and comparative examples, and measurements were performed, and the average value of the longest distance was used as the warp amount.
- Example 1 A polyvinyl alcohol film with a thickness of 30 ⁇ m (average degree of polymerization of about 2400, saponification degree of 99.9 mol% or more) was stretched about 5 times vertically and uniaxially by dry stretching, and was further uniaxially stretched to pure water at 60 ° C. while maintaining a tense state. After soaking for 1 minute, it was immersed in an aqueous solution at 28 ° C. having a weight ratio of iodine / potassium iodide / water of 0.05 / 5/100 for 60 seconds. Then, it was immersed in an aqueous solution at 72 ° C.
- a mixed water-based adhesive is applied to a thickness of 2 ⁇ m, and a 25 ⁇ m-thick triacetyl cellulose film [trade name “KC2UA” manufactured by Konica Minolta Co., Ltd.] (hereinafter, also referred to as TAC) is attached as a resin layer.
- a linear polarizing plate having a layer structure of child / adhesive layer / COP / adhesive layer was obtained.
- the front side polarizing plate and the back side polarizing plate were cut out from the prepared polarizing plate, and a glass panel was prepared as follows.
- the viewing-side polarizing plate is 130 mm (polarizer absorption axis direction) x 90 mm (polarizer transmission axis direction)
- the back-side polarizing plate is 90 mm (polarizer absorption axis direction) x 130 mm (polarizer transmission axis direction). It was cut to the size of. Further, diagonal so that the absorption axis of the front polarizing plate is parallel to the short side of the glass cell and the absorption axis is parallel to the long side of the glass cell to the back polarizing plate. It was cut into a 7-inch size to obtain a polarizing plate set.
- a pair of cut polarizing plates were attached to the glass cell via an adhesive layer so that the short sides of the two polarizing plates were parallel to the short sides of the glass cell.
- the thickness of the glass cell used was 0.4 mm.
- L1 and L2 were 20 ⁇ m, respectively.
- the amount of warpage was measured for the obtained glass panel. The results are shown in Table 1.
- Example 1 A polarizing plate set was produced in the same manner as in Example 1 except that the pressure-sensitive adhesive layer having a thickness of 5 ⁇ m used in Example 1 was used as a pressure-sensitive adhesive layer having a thickness of 25 ⁇ m. L1 and L2 were 40 ⁇ m, respectively. The results are shown in Table 1.
- polarizing plate set 100 front side polarizing plate, 110, 210 resin layer, 120, 220 bonded layer, 130, 230 polarizing element, 140, 240 bonded layer, 150, 250 low moisture permeability resin layer, 160, 260 adhesive layer, 200 backside polarizing plate, 300 liquid crystal cell, L1, L2 distance
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Abstract
[Problem] To provide a polarizing plate set which suppresses the warping of a liquid crystal panel. [Solution] This polarizing plate set includes: a front surface-side polarizing plate disposed on the viewing side of a liquid crystal cell; and a rear surface-side polarizing plate disposed on the rear surface-side of the liquid crystal cell, wherein the front surface-side polarizing plate and the rear surface-side polarizing plate each include a polarizer, and when the distance from a liquid crystal cell-side surface of the polarizer included in the front surface-side polarizing plate to a liquid crystal cell-side surface of the front surface-side polarizing plate is defined as L1 (μm), and the distance from a liquid crystal cell-side surface of the polarizer included in the rear surface-side polarizing plate to a liquid crystal cell-side surface of the rear surface-side polarizing plate is defined as L2 (μm), L1 (μm) and/or L2 (μm) are/is 35 μm or less, and at least one selected from the front surface-side polarizing plate and the rear surface-side polarizing plate has, on the liquid crystal cell-side of the polarizer, a resin layer having a moisture permeability of 400 g/m2・24hr or lower at a temperature of 40°C and a humidity of 90% RH.
Description
本発明は、偏光板セットおよび液晶パネルに関する。
The present invention relates to a polarizing plate set and a liquid crystal panel.
画像表示装置等において、液晶セルの視認側および背面側にそれぞれ偏光板が配置された液晶パネルが用いられている。液晶パネルは、高温環境下において使用すると反りが生じる場合があることが知られている（特許文献１及び２）。
In an image display device or the like, a liquid crystal panel in which polarizing plates are arranged on the visual side and the back side of the liquid crystal cell is used. It is known that a liquid crystal panel may warp when used in a high temperature environment (Patent Documents 1 and 2).
特許文献１には、偏光板セットにおいて凹形状に反る側の偏光板における保護層の引張弾性率を所定の式を満たすようにすることにより、高温環境下における液晶パネルの反りを低下させることが提案されている。特許文献２には、前面板一体型偏光板の偏光子の前面板から遠くなる面から液晶セルまでの距離を、背面側偏光板の偏光子の前面板側に近くなる面から液晶セルまでの距離より大きくすることにより、高温環境下における液晶パネルの反りを低下させることが提案されている。特許文献３には、加圧脱泡中に生じる液晶パネルの反りを低下させるために、偏光子の厚み、弾性率および寸法変化率並びに偏光子から液晶セルまでの距離から算出される値を特定の比率とした液晶表示装置が提案されている。
In Patent Document 1, the warp of the liquid crystal panel in a high temperature environment is reduced by satisfying a predetermined formula for the tensile elastic modulus of the protective layer in the polarizing plate on the side warped in the concave shape in the polarizing plate set. Has been proposed. In Patent Document 2, the distance from the surface far from the front plate of the polarizing plate of the front plate integrated polarizing plate to the liquid crystal cell is set to the distance from the surface close to the front plate side of the polarizing element of the back side polarizing plate to the liquid crystal cell. It has been proposed to reduce the warpage of the liquid crystal panel in a high temperature environment by making it larger than the distance. In Patent Document 3, in order to reduce the warp of the liquid crystal panel that occurs during pressure defoaming, a value calculated from the thickness, elastic modulus and dimensional change rate of the splitter and the distance from the splitter to the liquid crystal cell is specified. A liquid crystal display device having a ratio of the above has been proposed.
高温（例えば８５℃）環境下において反りが生じるのは、パネルに貼合される偏光板の構成要素であるポリビニルアルコール系樹脂フィルムを含む偏光子（以下、ＰＶＡ偏光子ともいう）が加熱により収縮するためである場合が多い。ＰＶＡ偏光子はとりわけ、加熱により延伸方向の収縮が大きい傾向にある。このようなＰＶＡ偏光子に起因する液晶パネルの反りは、上記特許文献に記載の偏光板セットにより低減できることがある。
Warping occurs in a high temperature (for example, 85 ° C.) environment because the polarizing element containing the polyvinyl alcohol-based resin film, which is a component of the polarizing plate attached to the panel (hereinafter, also referred to as PVA polarizing element), shrinks due to heating. In many cases, it is to do. PVA modulators, in particular, tend to shrink significantly in the stretching direction due to heating. The warp of the liquid crystal panel caused by such a PVA polarizing element may be reduced by the polarizing plate set described in the above patent document.
一方、液晶テレビ用モジュールを例えば船便で輸送し、開梱後、バックライトを点灯させると、液晶パネルに反りが生じるという問題が起きることがあった。液晶テレビの大型化が進むなか、大型液晶テレビ用の偏光板では、その面積の大きさのため、前面側偏光板および背面側偏光板のわずかな寸法変化に対して反り量は大きくなり、これを抑制することが面積の小さい用途と比べて非常に重要となる。
On the other hand, if the LCD TV module is transported by sea, for example, and the backlight is turned on after unpacking, there may be a problem that the LCD panel is warped. As the size of LCD TVs increases, the area of polarizing plates for large LCD TVs increases, so the amount of warpage increases with slight dimensional changes in the front and back polarizing plates. Is very important compared to applications with a small area.
本発明の目的は、液晶パネルの反りが抑制される偏光板セットを提供することである。
An object of the present invention is to provide a polarizing plate set in which warpage of a liquid crystal panel is suppressed.
本発明は、以下の偏光板セットおよび液晶パネルを提供する。
［１］ 液晶セルの視認側に配置される前面側偏光板と、前記液晶セルの背面側に配置される背面側偏光板とを含む偏光板セットであって、
前記前面側偏光板及び前記背面側偏光板は偏光子を含み、
前記前面側偏光板に含まれる偏光子の前記液晶セル側の面から前記前面側偏光板の前記液晶セル側の面までの距離をＬ１（μｍ）、及び前記背面側偏光板に含まれる偏光子の前記液晶セル側の面から前記背面側偏光板の前記液晶セル側の面までの距離をＬ２（μｍ）とするとき、前記Ｌ１（μｍ）及び前記Ｌ２（μｍ）の少なくともいずれか一方は３５μｍ以下であり、
前記前面側偏光板及び前記背面側偏光板から選ばれる少なくとも一つは、前記偏光子の前記液晶セル側に、温度４０℃および湿度９０％ＲＨにおける透湿度が４００ｇ／ｍ２・２４ｈｒ以下の樹脂層を有する、偏光板セット。
［２］ 前記Ｌ１（μｍ）及び前記Ｌ２（μｍ）の和が６０μｍ以下である、［１］に記載の偏光板セット。
［３］ 前記Ｌ１（μｍ）及び前記Ｌ２（μｍ）の差の絶対値が３μｍ以下である、［１］又は［２］に記載の偏光板セット。
［４］ 前記前面側偏光板及び前記背面側偏光板に含まれる偏光子は、実質的に同じ厚みを有する、［１］～［３］のいずれかに記載の偏光板セット。
［５］ 前記前面側偏光板及び前記背面側偏光板はいずれも、前記偏光子の前記液晶セル側に、前記温度４０℃および湿度９０％ＲＨにおける透湿度が４００ｇ／ｍ２・２４ｈｒ以下の樹脂層を有する、［１］～［４］のいずれかに記載の偏光板セット。
［６］ 前記前面側偏光板及び前記背面側偏光板はいずれも、前記偏光子の前記液晶セル側に環状シクロオレフィン系樹脂フィルムを含む、［１］～［５］のいずれかに記載の偏光板セット。
［７］ 前記前面側偏光板及び前記背面側偏光板はいずれも、前記偏光子の前記液晶セルとは反対側にトリアセチルセルロース系樹脂フィルムを含む、［１］～［６］のいずれかに記載の偏光板セット。
［８］ ［１］～［７］のいずれかに記載の偏光板セットと液晶セルとを備える液晶パネル。 The present invention provides the following polarizing plate set and liquid crystal panel.
[1] A polarizing plate set including a front-side polarizing plate arranged on the visible side of a liquid crystal cell and a back-side polarizing plate arranged on the back side of the liquid crystal cell.
The front-side polarizing plate and the back-side polarizing plate include a polarizing element.
The distance from the liquid crystal cell-side surface of the polarizing element included in the front-side polarizing plate to the liquid crystal cell-side surface of the front-side polarizing plate is L1 (μm), and the polarizing element included in the back-side polarizing plate. When the distance from the surface of the liquid crystal cell side to the surface of the back surface side polarizing plate on the liquid crystal cell side is L2 (μm), at least one of the L1 (μm) and the L2 (μm) is 35 μm. Is below
At least one selected from the front-side polarizing plate and the back-side polarizing plate is a resin having a water permeability of 400 g / m 2.24 hr or less at a temperature of 40 ° C. and a humidity of 90% RH on the liquid crystal cell side of the polarizing element. A set of polarizing plates having a layer.
[2] The polarizing plate set according to [1], wherein the sum of L1 (μm) and L2 (μm) is 60 μm or less.
[3] The polarizing plate set according to [1] or [2], wherein the absolute value of the difference between L1 (μm) and L2 (μm) is 3 μm or less.
[4] The polarizing plate set according to any one of [1] to [3], wherein the polarizing elements contained in the front-side polarizing plate and the back-side polarizing plate have substantially the same thickness.
[5] Both the front-side polarizing plate and the back-side polarizing plate are resins having a water permeability of 400 g / m 2.24 hr or less at the temperature of 40 ° C. and a humidity of 90% RH on the liquid crystal cell side of the polarizing element. The polarizing plate set according to any one of [1] to [4], which has a layer.
[6] The polarization according to any one of [1] to [5], wherein both the front-side polarizing plate and the back-side polarizing plate include a cyclic cycloolefin-based resin film on the liquid crystal cell side of the polarizing element. Board set.
[7] Both the front-side polarizing plate and the back-side polarizing plate include any of [1] to [6] containing a triacetyl cellulose-based resin film on the opposite side of the polarizing element from the liquid crystal cell. The described polarizing plate set.
[8] A liquid crystal panel comprising the polarizing plate set according to any one of [1] to [7] and a liquid crystal cell.
［１］ 液晶セルの視認側に配置される前面側偏光板と、前記液晶セルの背面側に配置される背面側偏光板とを含む偏光板セットであって、
前記前面側偏光板及び前記背面側偏光板は偏光子を含み、
前記前面側偏光板に含まれる偏光子の前記液晶セル側の面から前記前面側偏光板の前記液晶セル側の面までの距離をＬ１（μｍ）、及び前記背面側偏光板に含まれる偏光子の前記液晶セル側の面から前記背面側偏光板の前記液晶セル側の面までの距離をＬ２（μｍ）とするとき、前記Ｌ１（μｍ）及び前記Ｌ２（μｍ）の少なくともいずれか一方は３５μｍ以下であり、
前記前面側偏光板及び前記背面側偏光板から選ばれる少なくとも一つは、前記偏光子の前記液晶セル側に、温度４０℃および湿度９０％ＲＨにおける透湿度が４００ｇ／ｍ２・２４ｈｒ以下の樹脂層を有する、偏光板セット。
［２］ 前記Ｌ１（μｍ）及び前記Ｌ２（μｍ）の和が６０μｍ以下である、［１］に記載の偏光板セット。
［３］ 前記Ｌ１（μｍ）及び前記Ｌ２（μｍ）の差の絶対値が３μｍ以下である、［１］又は［２］に記載の偏光板セット。
［４］ 前記前面側偏光板及び前記背面側偏光板に含まれる偏光子は、実質的に同じ厚みを有する、［１］～［３］のいずれかに記載の偏光板セット。
［５］ 前記前面側偏光板及び前記背面側偏光板はいずれも、前記偏光子の前記液晶セル側に、前記温度４０℃および湿度９０％ＲＨにおける透湿度が４００ｇ／ｍ２・２４ｈｒ以下の樹脂層を有する、［１］～［４］のいずれかに記載の偏光板セット。
［６］ 前記前面側偏光板及び前記背面側偏光板はいずれも、前記偏光子の前記液晶セル側に環状シクロオレフィン系樹脂フィルムを含む、［１］～［５］のいずれかに記載の偏光板セット。
［７］ 前記前面側偏光板及び前記背面側偏光板はいずれも、前記偏光子の前記液晶セルとは反対側にトリアセチルセルロース系樹脂フィルムを含む、［１］～［６］のいずれかに記載の偏光板セット。
［８］ ［１］～［７］のいずれかに記載の偏光板セットと液晶セルとを備える液晶パネル。 The present invention provides the following polarizing plate set and liquid crystal panel.
[1] A polarizing plate set including a front-side polarizing plate arranged on the visible side of a liquid crystal cell and a back-side polarizing plate arranged on the back side of the liquid crystal cell.
The front-side polarizing plate and the back-side polarizing plate include a polarizing element.
The distance from the liquid crystal cell-side surface of the polarizing element included in the front-side polarizing plate to the liquid crystal cell-side surface of the front-side polarizing plate is L1 (μm), and the polarizing element included in the back-side polarizing plate. When the distance from the surface of the liquid crystal cell side to the surface of the back surface side polarizing plate on the liquid crystal cell side is L2 (μm), at least one of the L1 (μm) and the L2 (μm) is 35 μm. Is below
At least one selected from the front-side polarizing plate and the back-side polarizing plate is a resin having a water permeability of 400 g / m 2.24 hr or less at a temperature of 40 ° C. and a humidity of 90% RH on the liquid crystal cell side of the polarizing element. A set of polarizing plates having a layer.
[2] The polarizing plate set according to [1], wherein the sum of L1 (μm) and L2 (μm) is 60 μm or less.
[3] The polarizing plate set according to [1] or [2], wherein the absolute value of the difference between L1 (μm) and L2 (μm) is 3 μm or less.
[4] The polarizing plate set according to any one of [1] to [3], wherein the polarizing elements contained in the front-side polarizing plate and the back-side polarizing plate have substantially the same thickness.
[5] Both the front-side polarizing plate and the back-side polarizing plate are resins having a water permeability of 400 g / m 2.24 hr or less at the temperature of 40 ° C. and a humidity of 90% RH on the liquid crystal cell side of the polarizing element. The polarizing plate set according to any one of [1] to [4], which has a layer.
[6] The polarization according to any one of [1] to [5], wherein both the front-side polarizing plate and the back-side polarizing plate include a cyclic cycloolefin-based resin film on the liquid crystal cell side of the polarizing element. Board set.
[7] Both the front-side polarizing plate and the back-side polarizing plate include any of [1] to [6] containing a triacetyl cellulose-based resin film on the opposite side of the polarizing element from the liquid crystal cell. The described polarizing plate set.
[8] A liquid crystal panel comprising the polarizing plate set according to any one of [1] to [7] and a liquid crystal cell.
本発明によれば、液晶パネルの反りが抑制される偏光板セットを提供することができる。
According to the present invention, it is possible to provide a polarizing plate set in which the warp of a liquid crystal panel is suppressed.
以下、図面を参照しつつ本発明の実施形態を説明するが、本発明は以下の実施形態に限定されるものではない。以下の全ての図面においては、各構成要素を理解し易くするために縮尺を適宜調整して示しており、図面に示される各構成要素の縮尺と実際の構成要素の縮尺とは必ずしも一致しない。
Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments. In all the drawings below, the scales are appropriately adjusted and shown in order to make each component easier to understand, and the scale of each component shown in the drawings does not necessarily match the scale of the actual component.
＜偏光板セット＞
本発明の一態様に係る偏光板セットについて図１を参照しながら説明する。図１に示す偏光板セット１は、液晶セル３００の視認側に配置される前面側偏光板１００と、液晶セル３００の背面側に配置される背面側偏光板２００とから構成される。前面側偏光板１００および背面側偏光板２００は、同種であってもよいし、異種であってもよい。偏光板セットを液晶セルに貼合することにより液晶パネルを作製することができる。 <Polarizer set>
A polarizing plate set according to one aspect of the present invention will be described with reference to FIG. The polarizingplate set 1 shown in FIG. 1 is composed of a front-side polarizing plate 100 arranged on the visible side of the liquid crystal cell 300 and a back-side polarizing plate 200 arranged on the back surface side of the liquid crystal cell 300. The front side polarizing plate 100 and the back side polarizing plate 200 may be of the same type or different types. A liquid crystal panel can be manufactured by attaching a polarizing plate set to a liquid crystal cell.
本発明の一態様に係る偏光板セットについて図１を参照しながら説明する。図１に示す偏光板セット１は、液晶セル３００の視認側に配置される前面側偏光板１００と、液晶セル３００の背面側に配置される背面側偏光板２００とから構成される。前面側偏光板１００および背面側偏光板２００は、同種であってもよいし、異種であってもよい。偏光板セットを液晶セルに貼合することにより液晶パネルを作製することができる。 <Polarizer set>
A polarizing plate set according to one aspect of the present invention will be described with reference to FIG. The polarizing
前面側偏光板１００および背面側偏光板２００の形状は、例えば方形形状であってよく、好ましくは長辺と短辺とを有する方形形状であり、より好ましくは長方形である。前面側偏光板１００および背面側偏光板２００の大きさは、６６０ｍｍ以上の長辺及び３７０ｍｍ以上の短辺を有する方形形状（３２インチ型相当）であることが好ましく、８００ｍｍ以上の長辺および４５０ｍｍ以上の短辺を有する方形形状（４０インチ型相当）であることが好ましい。さらに、前面側偏光板１００および背面側偏光板２００の大きさは、１０００ｍｍ以上の長辺及び５５０ｍｍ以上の短辺を有する方形形状（５０インチ型相当）であることが好ましく、１３００ｍｍ以上の長辺および７００ｍｍ以上の短辺を有する方形形状（６０インチ型相当）であることが好ましい。
The shape of the front side polarizing plate 100 and the back side polarizing plate 200 may be, for example, a square shape, preferably a square shape having a long side and a short side, and more preferably a rectangular shape. The size of the front side polarizing plate 100 and the back side polarizing plate 200 is preferably a square shape (equivalent to a 32-inch type) having a long side of 660 mm or more and a short side of 370 mm or more, and a long side of 800 mm or more and 450 mm. A square shape (corresponding to a 40-inch type) having the above short sides is preferable. Further, the size of the front side polarizing plate 100 and the back side polarizing plate 200 is preferably a square shape (equivalent to a 50-inch type) having a long side of 1000 mm or more and a short side of 550 mm or more, and a long side of 1300 mm or more. A square shape (corresponding to a 60-inch type) having a short side of 700 mm or more is preferable.
偏光板セット１は、前面側偏光板１００および背面側偏光板２００の透過軸が互いにほぼ垂直になるように液晶セルに配置されることができる。前面側偏光板１００の透過軸に対する背面側偏光板２００の透過軸の角度は、例えば９０±５°の範囲内であってよく、好ましくは９０±１°の範囲内であり、より好ましくは９０±０．５°の範囲内である。
The polarizing plate set 1 can be arranged in the liquid crystal cell so that the transmission axes of the front side polarizing plate 100 and the back side polarizing plate 200 are substantially perpendicular to each other. The angle of the transmission axis of the back side polarizing plate 200 with respect to the transmission axis of the front side polarizing plate 100 may be, for example, in the range of 90 ± 5 °, preferably in the range of 90 ± 1 °, and more preferably 90. It is within the range of ± 0.5 °.
前面側偏光板１００、背面側偏光板２００および液晶セル３００の平面視形状は、例えば方形形状であってよく、好ましくは長辺と短辺とを有する方形形状であり、より好ましくは長方形である。前面側偏光板１００、背面側偏光板２００及び液晶セル３００の平面視形状が長方形である場合、偏光板セット１は、前面側偏光板１００の偏光子の吸収軸方向が液晶セルの長辺方向とほぼ平行となり、背面側偏光板２００の偏光子の吸収軸方向が液晶セルの短辺方向とほぼ平行となるように配置されてよく、または前面側偏光板１００の偏光子の吸収軸方向が液晶セルの短編方向とほぼ平行となり、背面側偏光板２００の偏光子の吸収軸方向が液晶セルの長編方向とほぼ平行となるように配置されてよい。ほぼ平行とは、例えば偏光板の吸収軸と液晶セルの長辺または短辺とのなす角が５°以下であってよく、好ましくは３°以下であり、より好ましくは１°以下である。
The planar view shape of the front side polarizing plate 100, the back side polarizing plate 200, and the liquid crystal cell 300 may be, for example, a square shape, preferably a square shape having a long side and a short side, and more preferably a rectangle. .. When the plan view shapes of the front-side polarizing plate 100, the back-side polarizing plate 200, and the liquid crystal cell 300 are rectangular, in the polarizing plate set 1, the absorption axis direction of the polarizing element of the front-side polarizing plate 100 is the long side direction of the liquid crystal cell. It may be arranged so that the absorption axis direction of the polarizing element of the back side polarizing plate 200 is substantially parallel to the short side direction of the liquid crystal cell, or the absorption axis direction of the polarizing element of the front side polarizing plate 100 may be substantially parallel to. It may be arranged so as to be substantially parallel to the short story direction of the liquid crystal cell and substantially parallel to the absorption axis direction of the polarizing element of the back side polarizing plate 200 to be substantially parallel to the long story direction of the liquid crystal cell. The term “nearly parallel” means that, for example, the angle formed by the absorption axis of the polarizing plate and the long side or the short side of the liquid crystal cell may be 5 ° or less, preferably 3 ° or less, and more preferably 1 ° or less.
前面側偏光板１００および背面側偏光板２００はいずれも、図示されていないが偏光子および樹脂層を含む。また、前面側偏光板１００および背面側偏光板２００はいずれも、前面側偏光板１００および背面側偏光板２００と液晶セルとを貼合するための粘着剤層（図示せず）を含む。前面側偏光板１００および背面側偏光板２００は、偏光子および後述の樹脂層以外に、例えば貼合層、位相差層、プロテクトフィルム等をさらに含むことができる。
Both the front-side polarizing plate 100 and the back-side polarizing plate 200 include a polarizing element and a resin layer, although not shown. Further, both the front-side polarizing plate 100 and the back-side polarizing plate 200 include a pressure-sensitive adhesive layer (not shown) for bonding the front-side polarizing plate 100 and the back-side polarizing plate 200 to the liquid crystal cell. The front-side polarizing plate 100 and the back-side polarizing plate 200 may further include, for example, a laminated layer, a retardation layer, a protective film, and the like, in addition to the polarizing element and the resin layer described later.
偏光板セット１は、前面側偏光板１００に含まれる偏光子の液晶セル３００側の面から前面側偏光板１００の液晶セル３００側の面までの距離をＬ１（μｍ）、および背面側偏光板２００に含まれる偏光子の液晶セル３００側の面から背面側偏光板２００の液晶セル３００側の面までの距離をＬ２（μｍ）とするとき、Ｌ１（μｍ）およびＬ２（μｍ）の少なくともいずれか一方は３５μｍ以下であり、かつ、前面側偏光板１００および背面側偏光板２００から選ばれる少なくとも一つは、偏光子の液晶セル側に、温度４０℃および湿度９０％ＲＨにおける透湿度（以下、簡略化のため透湿度ともいう）が４００ｇ／ｍ２・２４ｈｒ以下の樹脂層（図示せず）を有する。上記前面側偏光板１００の液晶セル３００側の面および背面側偏光板２００の液晶セル３００側の面は、前面側偏光板１００および背面側偏光板２００に含まれる粘着剤層（セパレートフィルムは含まない）の液晶セル側の面をいう。
In the polarizing plate set 1, the distance from the surface of the polarizing element on the liquid crystal cell 300 side included in the front side polarizing plate 100 to the surface of the front side polarizing plate 100 on the liquid crystal cell 300 side is L1 (μm), and the back side polarizing plate. When the distance from the surface of the polarizing element included in the 200 on the liquid crystal cell 300 side to the surface of the backside polarizing plate 200 on the liquid crystal cell 300 side is L2 (μm), at least one of L1 (μm) and L2 (μm). One of them is 35 μm or less, and at least one selected from the front side polarizing plate 100 and the back side polarizing plate 200 is on the liquid crystal cell side of the polarizing element and has a moisture permeability at a temperature of 40 ° C. and a humidity of 90% RH (hereinafter,). (Also referred to as moisture permeability for simplification) has a resin layer (not shown) having a permeability of 400 g / m 2.24 hr or less. The surface of the front-side polarizing plate 100 on the liquid crystal cell 300 side and the surface of the back-side polarizing plate 200 on the liquid crystal cell 300 side are the pressure-sensitive adhesive layers (including the separate film) contained in the front-side polarizing plate 100 and the back-side polarizing plate 200. (Not) refers to the surface on the liquid crystal cell side.
本発明者により、液晶セルに貼合されている偏光板の構成要素である偏光子は高い湿度の環境下に長時間晒されると徐々に水分が吸収され、その後バックライト点灯して時間が経つと、水分移動に伴い偏光子が変形し、この変形にともない、液晶セルの反りが発生することが分かった。例えば液晶テレビ用モジュールを船便で輸送する場合、船底では湿度が高く、長時間にわたり液晶セルに貼合されている偏光板が吸湿した状態となる。その状態で開梱後、単に偏光子の収縮力や偏光板の収縮力を低下させる方法では、外部からの水分の侵入を十分に防ぐことが困難であり、偏光子の吸水量が大きくなってしまい、結果として変形量が大きくなってしまう。本発明者の鋭意検討の結果、上記Ｌ１（μｍ）およびＬ２（μｍ）の少なくともいずれか一方を３５μｍ以下とし、かつ、前面側偏光板および背面側偏光板から選ばれる少なくとも一つが偏光子の液晶セル側に、透湿度が４００ｇ／
ｍ２・２４ｈｒ以下の樹脂層を有することにより、液晶パネルの反り量が低減され易くなる傾向にあることが見出された。これは、偏光子の液晶セル側からの水分の侵入を抑制しつつ、偏光子より液晶セル側に蓄積するひずみのエネルギーを小さくできるためであると推測される。 According to the present inventor, the polarizing element, which is a component of the polarizing plate attached to the liquid crystal cell, is gradually absorbed in moisture when exposed to a high humidity environment for a long time, and then the backlight is turned on for a long time. It was found that the polarizing element was deformed due to the movement of water, and the liquid crystal cell was warped due to this deformation. For example, when a module for an LCD TV is transported by sea, the humidity is high at the bottom of the ship, and the polarizing plate attached to the liquid crystal cell is in a state of absorbing moisture for a long time. After unpacking in that state, it is difficult to sufficiently prevent the intrusion of moisture from the outside by simply reducing the contractile force of the polarizing element and the contractile force of the polarizing plate, and the amount of water absorbed by the polarizing element becomes large. As a result, the amount of deformation becomes large. As a result of diligent studies by the present inventor, at least one of the above L1 (μm) and L2 (μm) is set to 35 μm or less, and at least one selected from the front-side polarizing plate and the back-side polarizing plate is a liquid crystal of a polarizing element. Moisture permeability is 400g / on the cell side
It has been found that having a resin layer of m 2.24 hr or less tends to reduce the amount of warpage of the liquid crystal panel. It is presumed that this is because the strain energy accumulated on the liquid crystal cell side of the polarizing element can be reduced while suppressing the intrusion of water from the liquid crystal cell side of the polarizing element.
ｍ２・２４ｈｒ以下の樹脂層を有することにより、液晶パネルの反り量が低減され易くなる傾向にあることが見出された。これは、偏光子の液晶セル側からの水分の侵入を抑制しつつ、偏光子より液晶セル側に蓄積するひずみのエネルギーを小さくできるためであると推測される。 According to the present inventor, the polarizing element, which is a component of the polarizing plate attached to the liquid crystal cell, is gradually absorbed in moisture when exposed to a high humidity environment for a long time, and then the backlight is turned on for a long time. It was found that the polarizing element was deformed due to the movement of water, and the liquid crystal cell was warped due to this deformation. For example, when a module for an LCD TV is transported by sea, the humidity is high at the bottom of the ship, and the polarizing plate attached to the liquid crystal cell is in a state of absorbing moisture for a long time. After unpacking in that state, it is difficult to sufficiently prevent the intrusion of moisture from the outside by simply reducing the contractile force of the polarizing element and the contractile force of the polarizing plate, and the amount of water absorbed by the polarizing element becomes large. As a result, the amount of deformation becomes large. As a result of diligent studies by the present inventor, at least one of the above L1 (μm) and L2 (μm) is set to 35 μm or less, and at least one selected from the front-side polarizing plate and the back-side polarizing plate is a liquid crystal of a polarizing element. Moisture permeability is 400g / on the cell side
It has been found that having a resin layer of m 2.24 hr or less tends to reduce the amount of warpage of the liquid crystal panel. It is presumed that this is because the strain energy accumulated on the liquid crystal cell side of the polarizing element can be reduced while suppressing the intrusion of water from the liquid crystal cell side of the polarizing element.
Ｌ１（μｍ）およびＬ２（μｍ）の少なくともいずれか一方は、液晶パネルの反り量の観点から好ましくは３０μｍ以下であり、より好ましくは２５μｍ以下であり、さらに好ましくは２０μｍ以下である。本明細書において、反り量は後述の実施例の欄において説明する方法に従って測定することができる。
At least one of L1 (μm) and L2 (μm) is preferably 30 μm or less, more preferably 25 μm or less, and further preferably 20 μm or less from the viewpoint of the amount of warpage of the liquid crystal panel. In the present specification, the amount of warpage can be measured according to the method described in the column of Examples described later.
Ｌ１（μｍ）およびＬ２（μｍ）はいずれも、液晶パネルの反り量の観点から好ましくは３５μｍ以下であり、より好ましくは３０μｍ以下であり、さらに好ましくは２５μｍ以下であり、特に好ましくは２０μｍ以下である。
Both L1 (μm) and L2 (μm) are preferably 35 μm or less, more preferably 30 μm or less, still more preferably 25 μm or less, and particularly preferably 20 μm or less from the viewpoint of the amount of warpage of the liquid crystal panel. be.
Ｌ１（μｍ）およびＬ２（μｍ）の和は、液晶パネルの反り量の観点から好ましくは６０μｍ以下であり、より好ましくは５０μｍ以下であり、さらに好ましくは４０μｍ以下である。
The sum of L1 (μm) and L2 (μm) is preferably 60 μm or less, more preferably 50 μm or less, and further preferably 40 μm or less from the viewpoint of the amount of warpage of the liquid crystal panel.
前面側偏光板と背面側偏光板との液晶セルへの歪力を等しくして打ち消し合うようにするために、Ｌ１（μｍ）およびＬ２（μｍ）は同程度とすることができる。Ｌ１（μｍ）およびＬ２（μｍ）の差の絶対値は、液晶パネルの反り量の観点から好ましくは３μｍ以下であり、より好ましくは２μｍ以下であり、さらに好ましくは１μｍ以下であり、特に好ましくは０である。
L1 (μm) and L2 (μm) can be set to the same level in order to equalize the strain forces on the liquid crystal cells of the front-side polarizing plate and the back-side polarizing plate so that they cancel each other out. The absolute value of the difference between L1 (μm) and L2 (μm) is preferably 3 μm or less, more preferably 2 μm or less, still more preferably 1 μm or less, and particularly preferably 1 μm or less from the viewpoint of the amount of warpage of the liquid crystal panel. It is 0.
［偏光子］
偏光子は、その吸収軸に平行な振動面をもつ直線偏光を吸収し、吸収軸に直交する（透過軸と平行な）振動面をもつ直線偏光を透過する性質を有する。偏光子と樹脂層とが積層されたものを直線偏光板ともいう。 [Polarizer]
The splitter has the property of absorbing linearly polarized light having a vibration plane parallel to its absorption axis and transmitting linear polarization having a vibration plane orthogonal to the absorption axis (parallel to the transmission axis). A laminated product of a polarizing element and a resin layer is also called a linear polarizing plate.
偏光子は、その吸収軸に平行な振動面をもつ直線偏光を吸収し、吸収軸に直交する（透過軸と平行な）振動面をもつ直線偏光を透過する性質を有する。偏光子と樹脂層とが積層されたものを直線偏光板ともいう。 [Polarizer]
The splitter has the property of absorbing linearly polarized light having a vibration plane parallel to its absorption axis and transmitting linear polarization having a vibration plane orthogonal to the absorption axis (parallel to the transmission axis). A laminated product of a polarizing element and a resin layer is also called a linear polarizing plate.
偏光子は、公知のポリビニルアルコール系樹脂にヨウ素が吸着したフィルムであることができる。偏光子は例えば、ポリビニルアルコール系樹脂を一軸延伸する工程、ポリビニルアルコール系樹脂をヨウ素で染色することにより、そのヨウ素を吸着させる工程、ヨウ素が吸着されたポリビニルアルコール系樹脂をホウ酸水溶液で処理する工程、およびホウ酸水溶液による処理後に水洗する工程を経て製造することができる。
The polarizing element can be a film in which iodine is adsorbed on a known polyvinyl alcohol-based resin. For the decoder, for example, a step of uniaxially stretching the polyvinyl alcohol-based resin, a step of adsorbing the polyvinyl alcohol-based resin by dyeing the polyvinyl alcohol-based resin with iodine, and treating the polyvinyl alcohol-based resin on which iodine is adsorbed with a boric acid aqueous solution. It can be produced through a step and a step of washing with water after treatment with an aqueous boric acid solution.
ポリビニルアルコール系樹脂は、ポリ酢酸ビニル系樹脂をケン化することによって得られる。ポリ酢酸ビニル系樹脂としては、酢酸ビニルの単独重合体であるポリ酢酸ビニルのほか、酢酸ビニルとそれに共重合可能な他の単量体との共重合体が用いられる。酢酸ビニルに共重合可能な他の単量体としては、例えば不飽和カルボン酸系化合物、オレフィン系化合物、ビニルエーテル系化合物、不飽和スルホン系化合物、アンモニウム基を有する（メタ）アクリルアミド系化合物が挙げられる。本明細書において「（メタ）アクリル」とは、アクリルおよびメタクリルから選択される少なくとも一方を意味する。「（メタ）アクリレート」等においても同様である。
The polyvinyl alcohol-based resin is obtained by saponifying the polyvinyl acetate-based resin. As the polyvinyl acetate-based resin, in addition to polyvinyl acetate which is a homopolymer of vinyl acetate, a copolymer of vinyl acetate and another monomer copolymerizable therewith is used. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acid compounds, olefin compounds, vinyl ether compounds, unsaturated sulfone compounds, and (meth) acrylamide compounds having an ammonium group. .. As used herein, the term "(meth) acrylic" means at least one selected from acrylic and methacrylic. The same applies to "(meth) acrylate" and the like.
ポリビニルアルコール系樹脂のケン化度は、通常８５モル％以上１００モル％以下程度であり、好ましくは９８モル％以上である。ポリビニルアルコール系樹脂は変性されていてもよく、アルデヒド類で変性されたポリビニルホルマール、ポリビニルアセタール等も使用することができる。ポリビニルアルコール系樹脂の重合度は、通常１０００以上１００００以下であり、好ましくは１５００以上５０００以下である。
The saponification degree of the polyvinyl alcohol-based resin is usually about 85 mol% or more and 100 mol% or less, preferably 98 mol% or more. The polyvinyl alcohol-based resin may be modified, and polyvinyl formal, polyvinyl acetal and the like modified with aldehydes can also be used. The degree of polymerization of the polyvinyl alcohol-based resin is usually 1000 or more and 10000 or less, preferably 1500 or more and 5000 or less.
偏光子の厚みは、吸水量が少ない方がよい観点から好ましくは３０μｍ以下であってよく、より好ましくは２５μｍ以下であり、さらに好ましくは２０μｍ以下であり、特に好ましくは１５μｍ以下である。偏光子の厚みは、通常２μｍ以上であり、３μｍ以上であることが好ましく、例えば５μｍ以上であってよい。前面側偏光板１００と背面側偏光板２００の偏光子の変形を打ち消し合うために、実質的に同じ厚みの偏光子を前面側偏光板１００および背面側偏光板２００に用いることが好ましい。
The thickness of the polarizing element may be preferably 30 μm or less, more preferably 25 μm or less, still more preferably 20 μm or less, and particularly preferably 15 μm or less, from the viewpoint that the amount of water absorption is better. The thickness of the splitter is usually 2 μm or more, preferably 3 μm or more, and may be, for example, 5 μm or more. In order to cancel the deformation of the polarizing elements of the front-side polarizing plate 100 and the back-side polarizing plate 200, it is preferable to use substituents having substantially the same thickness for the front-side polarizing plate 100 and the back-side polarizing plate 200.
［樹脂層］
樹脂層は、偏光子の片側又は両側に、偏光子上に直接的にまたは後述の貼合層を介して配置され、偏光子、とりわけ偏光子の表面を保護する機能を有することができる。樹脂層は、光学的に透明な熱可塑性樹脂フィルムおよび塗膜であることができる。前面側偏光板１００および背面側偏光板２００に複数の樹脂層が含まれる場合、樹脂層は互いに同種であってもよいし、異種であってもよい。 [Resin layer]
The resin layer can be arranged on one side or both sides of the polarizing element directly on the polarizing element or via a bonding layer described later, and can have a function of protecting the surface of the polarizing element, particularly the polarizing element. The resin layer can be an optically transparent thermoplastic resin film and coating film. When the frontside polarizing plate 100 and the back side polarizing plate 200 include a plurality of resin layers, the resin layers may be of the same type or different from each other.
樹脂層は、偏光子の片側又は両側に、偏光子上に直接的にまたは後述の貼合層を介して配置され、偏光子、とりわけ偏光子の表面を保護する機能を有することができる。樹脂層は、光学的に透明な熱可塑性樹脂フィルムおよび塗膜であることができる。前面側偏光板１００および背面側偏光板２００に複数の樹脂層が含まれる場合、樹脂層は互いに同種であってもよいし、異種であってもよい。 [Resin layer]
The resin layer can be arranged on one side or both sides of the polarizing element directly on the polarizing element or via a bonding layer described later, and can have a function of protecting the surface of the polarizing element, particularly the polarizing element. The resin layer can be an optically transparent thermoplastic resin film and coating film. When the front
熱可塑性樹脂フィルムは、偏光子の片面または両面に貼合されることができる。熱可塑性樹脂フィルムとしては、例えば透光性を有する、好ましくは光学的に透明な熱可塑性樹脂フィルムであってよく、その例としては、鎖状ポリオレフィン系樹脂（ポリエチレン系樹脂、ポリプロピレン系樹脂、ポリメチルペンテン系樹脂等）、環状ポリオレフィン系樹脂（ノルボルネン系樹脂等）等のポリオレフィン系樹脂；トリアセチルセルロース等のセルロース系樹脂；ポリエチレンテレフタレート、ポリエチレンナフタレート、ポリブチレンテレフタレート等のポリエステル系樹脂；ポリカーボネート系樹脂；エチレン－酢酸ビニル系樹脂；ポリスチレン系樹脂；ポリアミド系樹脂；ポリエーテルイミド系樹脂；ポリメチル（メタ）アクリレート樹脂等の（メタ）アクリル系樹脂；ポリイミド系樹脂；ポリエーテルスルホン系樹脂；ポリスルホン系樹脂；ポリ塩化ビニル系樹脂；ポリ塩化ビニリデン系樹脂；ポリビニルアルコール系樹脂；ポリビニルアセタール系樹脂；ポリエーテルケトン系樹脂；ポリエーテルエーテルケトン系樹脂；ポリエーテルスルホン系樹脂；ポリアミドイミド系樹脂等が挙げられる。熱可塑性樹脂は、単独でまたは２種以上混合して用いることができる。中でも、強度や透光性の観点から好ましくはトリアセチルセルロース系樹脂フィルム、環状ポリオレフィン系樹脂フィルムおよび（メタ）アクリル系樹脂フィルムである。
The thermoplastic resin film can be bonded to one side or both sides of the polarizing element. The thermoplastic resin film may be, for example, a translucent, preferably optically transparent thermoplastic resin film, and examples thereof include a chain polyolefin resin (polyethylene resin, polypropylene resin, poly). Polyethylene-based resins such as methylpentene-based resins), cyclic polyolefin-based resins (norbornen-based resins, etc.); Cellulosic resins such as triacetyl cellulose; Polyester-based resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate; Polycarbonate-based Resins; ethylene-vinyl acetate resin; polystyrene resin; polyamide resin; polyetherimide resin; (meth) acrylic resin such as polymethyl (meth) acrylate resin; polyimide resin; polyether sulfone resin; polysulfone system Resins; polyvinyl chloride-based resins; polyvinylidene chloride-based resins; polyvinyl alcohol-based resins; polyvinyl acetal-based resins; polyether ketone-based resins; polyether ether ketone-based resins; polyether sulfone-based resins; polyamideimide-based resins, etc. Be done. The thermoplastic resin can be used alone or in combination of two or more. Among them, a triacetyl cellulose-based resin film, a cyclic polyolefin-based resin film, and a (meth) acrylic-based resin film are preferable from the viewpoint of strength and translucency.
熱可塑性樹脂フィルムは位相差を有していても、有していなくてもよい。熱可塑性樹脂フィルムは、必要により可塑剤、紫外線吸収剤、赤外線吸収剤、顔料や染料のような着色剤、蛍光増白剤、分散剤、熱安定剤、光安定剤、帯電防止剤、酸化防止剤、滑剤等を含んでいてもよい。
The thermoplastic resin film may or may not have a phase difference. Thermoplastic resin films include plasticizers, UV absorbers, infrared absorbers, colorants such as pigments and dyes, optical brighteners, dispersants, heat stabilizers, light stabilizers, antistatic agents, antioxidants, as required. It may contain an agent, a lubricant, or the like.
熱可塑性樹脂フィルムの厚みは、例えば６０μｍ以下であってよく、偏光子と液晶セルとの間の距離を小さくする観点から好ましくは５０μｍ以下であり、より好ましくは４０μｍ以下である。また、通常１μｍ以上であり、好ましくは５μｍ以上であり、さらに好ましくは１５μｍ以上である。
The thickness of the thermoplastic resin film may be, for example, 60 μm or less, preferably 50 μm or less, and more preferably 40 μm or less from the viewpoint of reducing the distance between the polarizing element and the liquid crystal cell. Further, it is usually 1 μm or more, preferably 5 μm or more, and more preferably 15 μm or more.
熱可塑性樹脂フィルムの偏光子とは反対側の表面には、ハードコート層、反射防止層、帯電防止層のような表面処理層（コーティング層）を形成することもできる。
A surface treatment layer (coating layer) such as a hard coat layer, an antireflection layer, and an antistatic layer can be formed on the surface of the thermoplastic resin film opposite to the polarizing element.
熱可塑性樹脂フィルムにハードコート層を設けることにより、硬度およびスクラッチ性を向上させた樹脂フィルムとすることができる。ハードコート層は、活性エネルギー線硬化型樹脂を含むハードコート層形成用組成物の硬化物から形成することができる。紫外線硬化型樹脂としては、例えばアクリル系樹脂、シリコーン系樹脂、ポリエステル系樹脂、ウレタン系樹脂、アミド系樹脂、エポキシ系樹脂等が挙げられる。ハードコート層は、強度を向上させるために、添加剤を含んでいてもよい。添加剤は限定されることはなく、無機系微粒子、有機系微粒子、またはこれらの混合物が挙げられる。
By providing a hard coat layer on the thermoplastic resin film, it is possible to obtain a resin film having improved hardness and scratch resistance. The hardcoat layer can be formed from a cured product of a composition for forming a hardcoat layer containing an active energy ray-curable resin. Examples of the ultraviolet curable resin include acrylic resins, silicone resins, polyester resins, urethane resins, amide resins, epoxy resins and the like. The hardcourt layer may contain additives to improve its strength. Additives are not limited, and include inorganic fine particles, organic fine particles, or mixtures thereof.
塗膜である樹脂層は、例えば上述のハードコート層に用いる組成物やエポキシ樹脂等のカチオン硬化性組成物、（メタ）アクリレート等のラジカル硬化性組成物などのコーティング組成物を塗布し、硬化してなる層であってよい。また、塗膜である樹脂層は、コーティング組成物としてポリビニルアルコール系樹脂等の水溶液を用い、これを偏光子の表面に塗布し、乾燥することにより形成される層であってよい。塗膜である樹脂層は、必要により可塑剤、紫外線吸収剤、赤外線吸収剤、顔料や染料のような着色剤、蛍光増白剤、分散剤、熱安定剤、光安定剤、帯電防止剤、酸化防止剤、滑剤等を含んでいてもよい。
The resin layer, which is a coating film, is cured by applying a coating composition such as a composition used for the above-mentioned hard coat layer, a cationically curable composition such as an epoxy resin, or a radical curable composition such as (meth) acrylate. It may be a layer made of plastic. Further, the resin layer as a coating film may be a layer formed by using an aqueous solution of a polyvinyl alcohol-based resin or the like as a coating composition, applying the aqueous solution to the surface of the polarizing element, and drying the resin layer. The resin layer, which is a coating film, may be a plasticizer, an ultraviolet absorber, an infrared absorber, a colorant such as a pigment or a dye, a fluorescent whitening agent, a dispersant, a heat stabilizer, a light stabilizer, an antistatic agent, if necessary. It may contain an antioxidant, a lubricant and the like.
塗膜である樹脂層の厚みは、例えば３０μｍ以下であってよく、好ましくは２５μｍ以下であってよく、より好ましくは２０μｍ以下、さらに好ましくは１５μｍ、特に好ましくは１０μｍである。塗膜である樹脂層の厚みは、例えば０．１μｍ以上であってよい。
The thickness of the resin layer as the coating film may be, for example, 30 μm or less, preferably 25 μm or less, more preferably 20 μm or less, still more preferably 15 μm, and particularly preferably 10 μm. The thickness of the resin layer as the coating film may be, for example, 0.1 μm or more.
［透湿度が４００ｇ／ｍ２・２４ｈｒ以下である樹脂層］
前面側偏光板１００および背面側偏光板２００の少なくとも一方は、偏光子の液晶セル側に、透湿度が４００ｇ／ｍ２・２４ｈｒ以下である樹脂層（以下、簡略化のため低透湿度樹脂層ともいう）を含む。本明細書において、透湿度は後述の実施例の欄において説明する方法に従って測定することができる。 [Resin layer with moisture permeability of 400 g / m 2.24 hr or less]
At least one of the front-sidepolarizing plate 100 and the back-side polarizing plate 200 has a resin layer having a moisture permeability of 400 g / m 2.24 hr or less (hereinafter, a low-moisture-permeable resin layer for simplification) on the liquid crystal cell side of the polarizing element. Also called). In the present specification, the moisture permeability can be measured according to the method described in the column of Examples described later.
前面側偏光板１００および背面側偏光板２００の少なくとも一方は、偏光子の液晶セル側に、透湿度が４００ｇ／ｍ２・２４ｈｒ以下である樹脂層（以下、簡略化のため低透湿度樹脂層ともいう）を含む。本明細書において、透湿度は後述の実施例の欄において説明する方法に従って測定することができる。 [Resin layer with moisture permeability of 400 g / m 2.24 hr or less]
At least one of the front-side
低透湿度樹脂層は、液晶パネルの反り量の観点から好ましくは透湿度が３００ｇ／ｍ２・２４ｈｒ以下であり、より好ましくは２００ｇ／ｍ２・２４ｈｒ以下であり、さらに好ましくは１００ｇ／ｍ２・２４ｈｒ以下であり、特に好ましくは８０ｇ／ｍ２・２４ｈｒ以下である樹脂層を含む。低透湿度樹脂層は、例えば１０ｇ／ｍ２・２４ｈｒ以上であってよく、好ましくは３０ｇ／ｍ２・２４ｈｒ以上である。
From the viewpoint of the amount of warpage of the liquid crystal panel, the low moisture permeability resin layer preferably has a moisture permeability of 300 g / m 2.24 hr or less, more preferably 200 g / m 2.24 hr or less, and further preferably 100 g / m 2 . -Contains a resin layer of 24 hr or less, particularly preferably 80 g / m 2.24 hr or less. The low moisture permeability resin layer may be, for example, 10 g / m 2.24 hr or more, preferably 30 g / m 2.24 hr or more.
前面側偏光板１００および背面側偏光板２００はいずれも低透湿度樹脂層を含むことが好ましい。前面側偏光板１００および背面側偏光板２００はいずれも低透湿度樹脂層を含む場合、低透湿度樹脂層は互いに同種であってもよいし、異種であってもよい。低透湿度樹脂層は、上述の熱可塑性樹脂フィルムおよび塗膜に加えて、延伸した熱可塑性樹脂フィルム、キャスト法によって調製された塗膜、光硬化型樹脂組成物の硬化物を含む層等であってよい。低透湿度樹脂層としては、好ましくは環状ポリオレフィンを主モノマーとする樹脂からなる熱可塑性樹脂フィルムである。
It is preferable that both the front side polarizing plate 100 and the back side polarizing plate 200 include a low moisture permeability resin layer. When both the front-side polarizing plate 100 and the back-side polarizing plate 200 include a low-moisture-permeable resin layer, the low-moisture-permeable resin layers may be of the same type or different from each other. The low moisture permeability resin layer is a layer containing a stretched thermoplastic resin film, a coating film prepared by a casting method, a cured product of a photocurable resin composition, or the like, in addition to the above-mentioned thermoplastic resin film and coating film. It may be there. The low moisture permeability resin layer is preferably a thermoplastic resin film made of a resin containing cyclic polyolefin as a main monomer.
［貼合層］
貼合層は、偏光子と樹脂層とを貼合する層であることができる。貼合層は、接着剤または粘着剤から形成されることができる。接着剤としては、紫外線硬化性接着剤等の活性エネルギー線硬化性接着剤や、ポリビニルアルコール系樹脂の水溶液またはこれに架橋剤が配合された水溶液、ウレタン系エマルジョン接着剤等の水系接着剤を挙げることができる。偏光子の両面に熱可塑性樹脂フィルムを貼合する場合、２つの貼合層を形成する接着剤は同種であってもよいし、異種であってもよい。例えば、両面に熱可塑性樹脂フィルムを貼合する場合、片面は水系接着剤を用いて貼合し、もう片面は活性エネルギー線硬化性接着剤を用いて貼合してもよい。紫外線硬化型接着剤は、ラジカル重合性の（メタ）アクリル系化合物と光ラジカル重合開始剤の混合物や、カチオン重合性のエポキシ化合物と光カチオン重合開始剤の混合物等であることができる。また、カチオン重合性のエポキシ化合物とラジカル重合性の（メタ）アクリル系化合物とを併用し、開始剤として光カチオン重合開始剤と光ラジカル重合開始剤を併用することもできる。接着剤の厚みは、例えば０．１μｍ以上５μｍ以下であってよい。 [Lated layer]
The laminating layer can be a layer for laminating the polarizing element and the resin layer. The laminating layer can be formed from an adhesive or adhesive. Examples of the adhesive include an active energy ray-curable adhesive such as an ultraviolet curable adhesive, an aqueous solution of a polyvinyl alcohol-based resin or an aqueous solution containing a cross-linking agent, and a water-based adhesive such as a urethane-based emulsion adhesive. be able to. When the thermoplastic resin films are bonded to both sides of the polarizing element, the adhesives forming the two bonding layers may be of the same type or different types. For example, when a thermoplastic resin film is bonded on both sides, one side may be bonded using a water-based adhesive and the other side may be bonded using an active energy ray-curable adhesive. The ultraviolet curable adhesive may be a mixture of a radically polymerizable (meth) acrylic compound and a photoradical polymerization initiator, a mixture of a cationically polymerizable epoxy compound and a photocationic polymerization initiator, and the like. Further, a cationically polymerizable epoxy compound and a radically polymerizable (meth) acrylic compound may be used in combination, and a photocationic polymerization initiator and a photoradical polymerization initiator may be used in combination as an initiator. The thickness of the adhesive may be, for example, 0.1 μm or more and 5 μm or less.
貼合層は、偏光子と樹脂層とを貼合する層であることができる。貼合層は、接着剤または粘着剤から形成されることができる。接着剤としては、紫外線硬化性接着剤等の活性エネルギー線硬化性接着剤や、ポリビニルアルコール系樹脂の水溶液またはこれに架橋剤が配合された水溶液、ウレタン系エマルジョン接着剤等の水系接着剤を挙げることができる。偏光子の両面に熱可塑性樹脂フィルムを貼合する場合、２つの貼合層を形成する接着剤は同種であってもよいし、異種であってもよい。例えば、両面に熱可塑性樹脂フィルムを貼合する場合、片面は水系接着剤を用いて貼合し、もう片面は活性エネルギー線硬化性接着剤を用いて貼合してもよい。紫外線硬化型接着剤は、ラジカル重合性の（メタ）アクリル系化合物と光ラジカル重合開始剤の混合物や、カチオン重合性のエポキシ化合物と光カチオン重合開始剤の混合物等であることができる。また、カチオン重合性のエポキシ化合物とラジカル重合性の（メタ）アクリル系化合物とを併用し、開始剤として光カチオン重合開始剤と光ラジカル重合開始剤を併用することもできる。接着剤の厚みは、例えば０．１μｍ以上５μｍ以下であってよい。 [Lated layer]
The laminating layer can be a layer for laminating the polarizing element and the resin layer. The laminating layer can be formed from an adhesive or adhesive. Examples of the adhesive include an active energy ray-curable adhesive such as an ultraviolet curable adhesive, an aqueous solution of a polyvinyl alcohol-based resin or an aqueous solution containing a cross-linking agent, and a water-based adhesive such as a urethane-based emulsion adhesive. be able to. When the thermoplastic resin films are bonded to both sides of the polarizing element, the adhesives forming the two bonding layers may be of the same type or different types. For example, when a thermoplastic resin film is bonded on both sides, one side may be bonded using a water-based adhesive and the other side may be bonded using an active energy ray-curable adhesive. The ultraviolet curable adhesive may be a mixture of a radically polymerizable (meth) acrylic compound and a photoradical polymerization initiator, a mixture of a cationically polymerizable epoxy compound and a photocationic polymerization initiator, and the like. Further, a cationically polymerizable epoxy compound and a radically polymerizable (meth) acrylic compound may be used in combination, and a photocationic polymerization initiator and a photoradical polymerization initiator may be used in combination as an initiator. The thickness of the adhesive may be, for example, 0.1 μm or more and 5 μm or less.
活性エネルギー線硬化性接着剤を用いる場合、貼合後、活性エネルギー線を照射することによって接着剤を硬化させる。活性エネルギー線の光源は特に限定されないが、波長４００ｎｍ以下に発光分布を有する活性エネルギー線（紫外線）が好ましく、具体的には、低圧水銀灯、中圧水銀灯、高圧水銀灯、超高圧水銀灯、ケミカルランプ、ブラックライトランプ、マイクロウェーブ励起水銀灯、メタルハライドランプ等が好ましく用いられる。
When using an active energy ray-curable adhesive, the adhesive is cured by irradiating it with active energy rays after bonding. The light source of the active energy ray is not particularly limited, but an active energy ray (ultraviolet ray) having a emission distribution at a wavelength of 400 nm or less is preferable, and specifically, a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a chemical lamp, Black light lamps, microwave-excited mercury lamps, metal halide lamps and the like are preferably used.
偏光子と熱可塑性樹脂フィルムとの接着性を向上させるために、偏光子と熱可塑性樹脂フィルムとの貼合に先立ち、偏光子および熱可塑性樹脂フィルムの少なくとも一方の貼合面に、コロナ処理、火炎処理、プラズマ処理、紫外線照射処理、プライマー塗布処理、ケン化処理等の表面処理を施してもよい。
In order to improve the adhesiveness between the decoder and the thermoplastic resin film, prior to the bonding of the decoder and the thermoplastic resin film, at least one bonding surface of the polarizing element and the thermoplastic resin film is corona-treated. Surface treatments such as flame treatment, plasma treatment, ultraviolet irradiation treatment, primer coating treatment, and saponification treatment may be performed.
貼合層が接着剤から形成される場合、貼合層の厚みは、例えば０．０１μｍ以上１０μｍであってよい。
When the bonded layer is formed from an adhesive, the thickness of the bonded layer may be, for example, 0.01 μm or more and 10 μm.
貼合層に用いる粘着剤としては、例えば感圧式粘着剤（以下、粘着剤ともいう）であることができる。
As the pressure-sensitive adhesive used for the bonding layer, for example, a pressure-sensitive pressure-sensitive adhesive (hereinafter, also referred to as a pressure-sensitive adhesive) can be used.
粘着剤は、（メタ）アクリル系、ゴム系、ウレタン系、エステル系、シリコーン系、ポリビニルエーテル系のような樹脂を主成分とする粘着剤組成物から構成することができる。中でも、透明性、耐候性、耐熱性および貯蔵弾性率の観点から好ましくは（メタ）アクリル系樹脂をベースポリマーとする粘着剤組成物である。粘着剤組成物は、活性エネルギー線硬化型または熱硬化型であってもよい。
The pressure-sensitive adhesive can be composed of a pressure-sensitive adhesive composition containing a resin as a main component, such as (meth) acrylic, rubber, urethane, ester, silicone, and polyvinyl ether. Among them, a pressure-sensitive adhesive composition using a (meth) acrylic resin as a base polymer is preferable from the viewpoint of transparency, weather resistance, heat resistance and storage elastic modulus. The pressure-sensitive adhesive composition may be an active energy ray-curable type or a thermosetting type.
粘着剤組成物に用いられる（メタ）アクリル系樹脂（ベースポリマー）としては、例えば、（メタ）アクリル酸ブチル、（メタ）アクリル酸エチル、（メタ）アクリル酸イソオクチル、（メタ）アクリル酸２－エチルヘキシルのような（メタ）アクリル酸エステルの１種または２種以上をモノマーとする重合体または共重合体が好適に用いられる。ベースポリマーには、極性モノマーを共重合させることが好ましい。極性モノマーとしては、例えば、（メタ）アクリル酸、（メタ）アクリル酸２－ヒドロキシプロピル、（メタ）アクリル酸ヒドロキシエチル、（メタ）アクリルアミド、Ｎ，Ｎ－ジメチルアミノエチル（メタ）アクリレート、グリシジル（メタ）アクリレートのような、カルボキシル基、水酸基、アミド基、アミノ基、エポキシ基等を有するモノマーを挙げることができる。
Examples of the (meth) acrylic resin (base polymer) used in the pressure-sensitive adhesive composition include butyl (meth) acrylate, ethyl (meth) acrylate, isooctyl (meth) acrylate, and 2- (meth) acrylate. A polymer or copolymer having one or more (meth) acrylic acid esters such as ethylhexyl as a monomer is preferably used. It is preferable that the base polymer is copolymerized with a polar monomer. Examples of the polar monomer include (meth) acrylic acid, 2-hydroxypropyl (meth) acrylic acid, hydroxyethyl (meth) acrylic acid, (meth) acrylamide, N, N-dimethylaminoethyl (meth) acrylate, and glycidyl ( Examples thereof include monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group and the like, such as meth) acrylate.
粘着剤組成物は、上記ベースポリマーのみを含むものであってもよいが、通常は架橋剤をさらに含有する。架橋剤としては、２価以上の金属イオンであって、カルボキシル基との間でカルボン酸金属塩を形成するもの；ポリアミン化合物であって、カルボキシル基との間でアミド結合を形成するもの；ポリエポキシ化合物やポリオールであって、カルボキシル基との間でエステル結合を形成するもの；ポリイソシアネート化合物であって、カルボキシル基との間でアミド結合を形成するものが例示される。中でも、ポリイソシアネート化合物が好ましい。
The pressure-sensitive adhesive composition may contain only the above-mentioned base polymer, but usually further contains a cross-linking agent. The cross-linking agent is a divalent or higher metal ion that forms a carboxylic acid metal salt with a carboxyl group; a polyamine compound that forms an amide bond with a carboxyl group; poly. Epoxy compounds and polyols that form an ester bond with a carboxyl group; polyisocyanate compounds that form an amide bond with a carboxyl group are exemplified. Of these, polyisocyanate compounds are preferable.
貼合層を粘着剤から形成する場合、例えば、トルエンや酢酸エチル等の有機溶剤に粘着剤組成物を溶解または分散させて粘着剤液を調製し、これを貼合面に直接塗工して粘着剤層を形成する方式や、離型処理が施されたセパレートフィルム上に粘着剤層をシート状に形成しておき、それを貼合面に移着する方式等により行うことができる。
When the bonding layer is formed from a pressure-sensitive adhesive, for example, the pressure-sensitive adhesive composition is dissolved or dispersed in an organic solvent such as toluene or ethyl acetate to prepare a pressure-sensitive adhesive solution, which is directly applied to the bonded surface. This can be done by a method of forming the pressure-sensitive adhesive layer, a method of forming the pressure-sensitive adhesive layer in the form of a sheet on a separate film that has been subjected to a mold release treatment, and a method of transferring the pressure-sensitive adhesive layer to the bonding surface.
セパレートフィルムは、ポリエチレン等のポリエチレン系樹脂、ポリプロピレン等のポリプロピレン系樹脂、ポリエチレンテレフタレート等のポリエステル系樹脂等からなるフィルムであることができる。中でも、ポリエチレンテレフタレートの延伸フィルムが好ましい。
The separate film can be a film made of a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester resin such as polyethylene terephthalate, or the like. Of these, a stretched film of polyethylene terephthalate is preferable.
粘着剤は、任意成分、例えばガラス繊維、ガラスビーズ、樹脂ビーズ、金属粉や他の無機粉末からなる充填剤、顔料、着色剤、酸化防止剤、紫外線吸収剤、帯電防止剤等を含むことができる。
The pressure-sensitive adhesive may contain optional components such as glass fibers, glass beads, resin beads, fillers composed of metal powder and other inorganic powders, pigments, colorants, antioxidants, ultraviolet absorbers, antistatic agents and the like. can.
帯電防止剤としては、例えば、イオン性化合物、導電性微粒子、導電性高分子等を挙げることができるが、イオン性化合物が好ましく用いられる。
イオン性化合物を構成するカチオン成分は無機カチオンでも有機カチオンでもよい。
有機カチオンとしては、ピリジニウムカチオン、イミダゾリウムカチオン、アンモニウムカチオン、スルホニウムカチオン、ホスホニウムカチオン、ピペリジニウムカチオン、ピロリジニウムカチオン等が挙げられ、無機カチオンとしてはリチウムイオン、カリウムイオン等が挙げられる。
一方、イオン性化合物を構成するアニオン成分としては、無機アニオンでも有機アニオンでもよいが、帯電防止性能に優れるイオン性化合物を与えることから、フッ素原子を含むアニオン成分が好ましい。フッ素原子を含むアニオン成分としては、ヘキサフルオロホスフェートアニオン［（ＰＦ６ －）］、ビス（トリフルオロメタンスルホニル）イミドアニオン［（ＣＦ３ＳＯ２）２Ｎ－］アニオン、ビス（フルオロスルホニル）イミドアニオン［（ＦＳＯ２）２Ｎ－］アニオン等が挙げられる。 Examples of the antistatic agent include ionic compounds, conductive fine particles, conductive polymers and the like, and ionic compounds are preferably used.
The cation component constituting the ionic compound may be an inorganic cation or an organic cation.
Examples of the organic cation include pyridinium cation, imidazolium cation, ammonium cation, sulfonium cation, phosphonium cation, piperidinium cation, pyrrolidinium cation and the like, and examples of the inorganic cation include lithium ion and potassium ion.
On the other hand, the anion component constituting the ionic compound may be an inorganic anion or an organic anion, but an anion component containing a fluorine atom is preferable because it provides an ionic compound having excellent antistatic performance. As anion components containing a fluorine atom, hexafluorophosphate anion [(PF 6- ) ], bis (trifluoromethanesulfonyl) imide anion [(CF 3 SO 2 ) 2 N- ] anion, bis (fluorosulfonyl) imide anion [ (FSO 2 ) 2 N- ] Anions and the like can be mentioned.
イオン性化合物を構成するカチオン成分は無機カチオンでも有機カチオンでもよい。
有機カチオンとしては、ピリジニウムカチオン、イミダゾリウムカチオン、アンモニウムカチオン、スルホニウムカチオン、ホスホニウムカチオン、ピペリジニウムカチオン、ピロリジニウムカチオン等が挙げられ、無機カチオンとしてはリチウムイオン、カリウムイオン等が挙げられる。
一方、イオン性化合物を構成するアニオン成分としては、無機アニオンでも有機アニオンでもよいが、帯電防止性能に優れるイオン性化合物を与えることから、フッ素原子を含むアニオン成分が好ましい。フッ素原子を含むアニオン成分としては、ヘキサフルオロホスフェートアニオン［（ＰＦ６ －）］、ビス（トリフルオロメタンスルホニル）イミドアニオン［（ＣＦ３ＳＯ２）２Ｎ－］アニオン、ビス（フルオロスルホニル）イミドアニオン［（ＦＳＯ２）２Ｎ－］アニオン等が挙げられる。 Examples of the antistatic agent include ionic compounds, conductive fine particles, conductive polymers and the like, and ionic compounds are preferably used.
The cation component constituting the ionic compound may be an inorganic cation or an organic cation.
Examples of the organic cation include pyridinium cation, imidazolium cation, ammonium cation, sulfonium cation, phosphonium cation, piperidinium cation, pyrrolidinium cation and the like, and examples of the inorganic cation include lithium ion and potassium ion.
On the other hand, the anion component constituting the ionic compound may be an inorganic anion or an organic anion, but an anion component containing a fluorine atom is preferable because it provides an ionic compound having excellent antistatic performance. As anion components containing a fluorine atom, hexafluorophosphate anion [(PF 6- ) ], bis (trifluoromethanesulfonyl) imide anion [(CF 3 SO 2 ) 2 N- ] anion, bis (fluorosulfonyl) imide anion [ (FSO 2 ) 2 N- ] Anions and the like can be mentioned.
粘着剤から形成される貼合層の厚みは、例えば３０μｍ以下であってよく、好ましくは２５μｍ以下であり、より好ましくは２０μｍ以下である。粘着剤から形成される貼合層の厚みは、例えば１μｍ以上であってよく、好ましくは２μｍ以上、より好ましくは３μｍ以上である。
The thickness of the bonding layer formed from the pressure-sensitive adhesive may be, for example, 30 μm or less, preferably 25 μm or less, and more preferably 20 μm or less. The thickness of the bonding layer formed from the pressure-sensitive adhesive may be, for example, 1 μm or more, preferably 2 μm or more, and more preferably 3 μm or more.
接着性を向上させるために貼合面に、コロナ処理、火炎処理、プラズマ処理、紫外線照射処理、プライマー塗布処理、ケン化処理等の表面処理を施してもよい。
In order to improve the adhesiveness, the bonded surface may be subjected to surface treatment such as corona treatment, flame treatment, plasma treatment, ultraviolet irradiation treatment, primer coating treatment, saponification treatment and the like.
［粘着剤層］
粘着剤層は、前面側偏光板１００および背面側偏光板２００を液晶セル３００に貼合する機能を有することができる。粘着剤層を構成する粘着剤としては、従来公知の粘着剤を特に制限なく用いることができ、上述の貼合層において例示した粘着剤を用いることができる。また、活性エネルギー線硬化型粘着剤、熱硬化型粘着剤などであってもよい。粘着剤層は、セパレートフィルムを有することができる。 [Adhesive layer]
The pressure-sensitive adhesive layer can have a function of bonding the frontside polarizing plate 100 and the back side polarizing plate 200 to the liquid crystal cell 300. As the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer, a conventionally known pressure-sensitive adhesive can be used without particular limitation, and the pressure-sensitive adhesive exemplified in the above-mentioned bonding layer can be used. Further, it may be an active energy ray-curable pressure-sensitive adhesive, a thermosetting pressure-sensitive adhesive, or the like. The pressure-sensitive adhesive layer can have a separate film.
粘着剤層は、前面側偏光板１００および背面側偏光板２００を液晶セル３００に貼合する機能を有することができる。粘着剤層を構成する粘着剤としては、従来公知の粘着剤を特に制限なく用いることができ、上述の貼合層において例示した粘着剤を用いることができる。また、活性エネルギー線硬化型粘着剤、熱硬化型粘着剤などであってもよい。粘着剤層は、セパレートフィルムを有することができる。 [Adhesive layer]
The pressure-sensitive adhesive layer can have a function of bonding the front
［位相差層］
前面側偏光板１００および背面側偏光板２００は、偏光子と液晶セルとの間に相差層を含むことができる。位相差層は、単層であってもよいし、２層以上の位相差層からなる位相差層積層体であってもよい。位相差層は、上述の貼合層を介して偏光子または直線偏光板に積層することができる。 [Phase difference layer]
The front-sidepolarizing plate 100 and the back-side polarizing plate 200 can include a retardation layer between the polarizing element and the liquid crystal cell. The retardation layer may be a single layer, or may be a retardation layer laminate composed of two or more retardation layers. The retardation layer can be laminated on a polarizing element or a linear polarizing plate via the above-mentioned bonding layer.
前面側偏光板１００および背面側偏光板２００は、偏光子と液晶セルとの間に相差層を含むことができる。位相差層は、単層であってもよいし、２層以上の位相差層からなる位相差層積層体であってもよい。位相差層は、上述の貼合層を介して偏光子または直線偏光板に積層することができる。 [Phase difference layer]
The front-side
位相差層としては、λ／４層やλ／２層のようなポジティブＡ層、およびポジティブＣ層であることができる。位相差層は、重合性液晶化合物の硬化物を含む液晶硬化層から形成されてもよいし、上述の熱可塑性樹脂フィルムの材料として例示をした樹脂フィルムから形成されてもよい。フィルム状位相差層１３０は、配向層や基材をさらに含んでいてもよい。
The retardation layer can be a positive A layer such as a λ / 4 layer or a λ / 2 layer, and a positive C layer. The retardation layer may be formed from a liquid crystal cured layer containing a cured product of a polymerizable liquid crystal compound, or may be formed from a resin film exemplified as a material for the above-mentioned thermoplastic resin film. The film-like retardation layer 130 may further include an alignment layer and a base material.
位相差層は、好ましくはλ／４層を含み、より好ましくはλ／４層と、λ／２層及びポジティブＣ層の少なくともいずれか一方とを含む。位相差層がλ／２層を含む場合、偏光子側から順にλ／２層及びλ／４層となるように積層することができる。位相差層がポジティブＣ層を含む場合、偏光子側から順にλ／４層及びポジティブＣ層となるように積層してもよく、偏光子側から順にポジティブＣ層及びλ／４層となるように積層してもよい。
The retardation layer preferably includes a λ / 4 layer, more preferably a λ / 4 layer, and at least one of a λ / 2 layer and a positive C layer. When the retardation layer includes a λ / 2 layer, it can be laminated so as to be a λ / 2 layer and a λ / 4 layer in order from the splitter side. When the retardation layer contains a positive C layer, the layers may be laminated so as to be a λ / 4 layer and a positive C layer in order from the splitter side, or to be a positive C layer and a λ / 4 layer in order from the splitter side. It may be laminated on.
位相差層の厚みは、例えば０．１μｍ以上５０μｍ以下であってよく、好ましくは１μｍ以上３０μｍ以下、より好ましくは０．５μｍ以上１５μｍ以下である。
The thickness of the retardation layer may be, for example, 0.1 μm or more and 50 μm or less, preferably 1 μm or more and 30 μm or less, and more preferably 0.5 μm or more and 15 μm or less.
［プロテクトフィルム］
前面側偏光板１００および背面側偏光板２００は、液晶セル３００とは反対側にプロテクトフィルムを有していてもよい。プロテクトフィルムは、例えば液晶セルや他の光学部材に偏光板が貼合された後、それが有する粘着剤層ごと剥離除去されることができる。 [Protect film]
The frontside polarizing plate 100 and the back side polarizing plate 200 may have a protective film on the side opposite to the liquid crystal cell 300. The protective film can be peeled off together with the pressure-sensitive adhesive layer that the polarizing plate is attached to, for example, a liquid crystal cell or another optical member.
前面側偏光板１００および背面側偏光板２００は、液晶セル３００とは反対側にプロテクトフィルムを有していてもよい。プロテクトフィルムは、例えば液晶セルや他の光学部材に偏光板が貼合された後、それが有する粘着剤層ごと剥離除去されることができる。 [Protect film]
The front
プロテクトフィルムは、例えば、基材フィルムとその上に積層される粘着剤層とで構成される。粘着剤層については上述の貼合層についての説明が適用される。基材フィルムを構成する樹脂は、例えば、ポリエチレンのようなポリエチレン系樹脂、ポリプロピレンのようなポリプロピレン系樹脂、ポリエチレンテレフタレートやポリエチレンナフタレートのようなポリエステル系樹脂、ポリカーボネート系樹脂等の熱可塑性樹脂であることができる。好ましくは、ポリエチレンテレフタレート等のポリエステル系樹脂である。
The protect film is composed of, for example, a base film and an adhesive layer laminated on the base film. As for the pressure-sensitive adhesive layer, the above description of the bonded layer is applied. The resin constituting the base film is, for example, a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester resin such as polyethylene terephthalate or polyethylene naphthalate, or a thermoplastic resin such as a polycarbonate resin. be able to. A polyester resin such as polyethylene terephthalate is preferable.
プロテクトフィルムの厚みとしては、特に限定されないが、例えば２０μｍ以上２００μｍ以下の範囲とすることが好ましい。基材の厚さが２０μｍ以上であると、前面側偏光板１００および背面側偏光板２００に強度が付与され易くなる傾向にある。
The thickness of the protective film is not particularly limited, but is preferably in the range of, for example, 20 μm or more and 200 μm or less. When the thickness of the base material is 20 μm or more, strength tends to be easily imparted to the front-side polarizing plate 100 and the back-side polarizing plate 200.
［偏光板セットの層構成］
本発明の一態様に係る偏光板セットについて図２を参照しながら説明する。図２に示す偏光板セット２は、液晶セル３００の視認側に配置される前面側偏光板１０１と、液晶セル３００の背面側に配置される背面側偏光板２０１とから構成される。前面側偏光板１０１および背面側偏光板２０１はそれぞれ偏光子１３０、２３０を含む。前面側偏光板１０１は、樹脂層１１０、低透湿度樹脂層１５０、貼合層１２０、１４０、粘着剤層１６０をさらに含む。また、図１に示すように、背面側偏光板２０１は、樹脂層２１０、低透湿度樹脂層２５０、貼合層２２０、２４０、粘着剤層２６０をさらに含む。 [Layer structure of polarizing plate set]
A polarizing plate set according to one aspect of the present invention will be described with reference to FIG. The polarizing plate set 2 shown in FIG. 2 is composed of a front-sidepolarizing plate 101 arranged on the visible side of the liquid crystal cell 300 and a back-side polarizing plate 201 arranged on the back surface side of the liquid crystal cell 300. The front-side polarizing plate 101 and the back-side polarizing plate 201 include the modulators 130 and 230, respectively. The front-side polarizing plate 101 further includes a resin layer 110, a low-moisture-permeable resin layer 150, a bonding layer 120, 140, and an adhesive layer 160. Further, as shown in FIG. 1, the back surface side polarizing plate 201 further includes a resin layer 210, a low moisture permeability resin layer 250, a bonding layer 220, 240, and an adhesive layer 260.
本発明の一態様に係る偏光板セットについて図２を参照しながら説明する。図２に示す偏光板セット２は、液晶セル３００の視認側に配置される前面側偏光板１０１と、液晶セル３００の背面側に配置される背面側偏光板２０１とから構成される。前面側偏光板１０１および背面側偏光板２０１はそれぞれ偏光子１３０、２３０を含む。前面側偏光板１０１は、樹脂層１１０、低透湿度樹脂層１５０、貼合層１２０、１４０、粘着剤層１６０をさらに含む。また、図１に示すように、背面側偏光板２０１は、樹脂層２１０、低透湿度樹脂層２５０、貼合層２２０、２４０、粘着剤層２６０をさらに含む。 [Layer structure of polarizing plate set]
A polarizing plate set according to one aspect of the present invention will be described with reference to FIG. The polarizing plate set 2 shown in FIG. 2 is composed of a front-side
［偏光板の製造方法］
前面側偏光板および背面側偏光板は、例えば各層を貼合層により貼合することによって製造することができる。貼合する場合には、密着性を高めるために、貼合面の一方または両方に対して、例えばコロナ処理等の表面活性化処理を施すことが好ましい。 [Manufacturing method of polarizing plate]
The front-side polarizing plate and the back-side polarizing plate can be manufactured, for example, by laminating each layer with a laminating layer. In the case of bonding, it is preferable to apply a surface activation treatment such as corona treatment to one or both of the bonded surfaces in order to improve the adhesion.
前面側偏光板および背面側偏光板は、例えば各層を貼合層により貼合することによって製造することができる。貼合する場合には、密着性を高めるために、貼合面の一方または両方に対して、例えばコロナ処理等の表面活性化処理を施すことが好ましい。 [Manufacturing method of polarizing plate]
The front-side polarizing plate and the back-side polarizing plate can be manufactured, for example, by laminating each layer with a laminating layer. In the case of bonding, it is preferable to apply a surface activation treatment such as corona treatment to one or both of the bonded surfaces in order to improve the adhesion.
粘着剤層は粘着シートとして準備することができる。粘着シートは、例えばトルエンや酢酸エチル等の有機溶剤に粘着剤組成物を溶解または分散させて粘着剤液を調製し、これを離型処理が施された剥離フィルム上に粘着剤からなる層をシート状に形成しておき、その粘着剤層上にさらに別の剥離フィルムを貼合する方式等により作製することができる。一方の剥離フィルムを剥離した粘着シートを一方の層（例えば偏光板）に貼合し、次いで他方の剥離フィルムを剥離し、他方の層（例えば液晶セル）を貼合する方法により各層を貼合することができる。
The adhesive layer can be prepared as an adhesive sheet. For the pressure-sensitive adhesive sheet, for example, a pressure-sensitive adhesive composition is prepared by dissolving or dispersing the pressure-sensitive adhesive composition in an organic solvent such as toluene or ethyl acetate, and a layer made of the pressure-sensitive adhesive is formed on a release film which has been subjected to a mold release treatment. It can be produced by forming it into a sheet shape and laminating another release film on the pressure-sensitive adhesive layer. The pressure-sensitive adhesive sheet from which one release film has been peeled off is attached to one layer (for example, a polarizing plate), then the other release film is peeled off, and each layer is attached by the method of attaching the other layer (for example, a liquid crystal cell). can do.
粘着剤液を剥離フィルム上に塗工する方法としては、ダイコーター、カンマコーター、リバースロールコーター、グラビアコーター、ロッドコーター、ワイヤーバーコーター、ドクターブレードコーター、エアドクターコーターなどを用いた通常のコーティング技術を採用すればよい。
As a method of applying the adhesive liquid on the release film, a usual coating technique using a die coater, a comma coater, a reverse roll coater, a gravure coater, a rod coater, a wire bar coater, a doctor blade coater, an air doctor coater, etc. Should be adopted.
剥離フィルムは、プラスチックフィルムと剥離層とから構成されることが好ましい。プラスチックフィルムとしては、ポリエチレンテレフタレートフィルム、ポリブチレンテレフタレートフィルム、およびポリエチレンナフタレートフィルム等のポリエステルフィルムや、ポリプロピレンフィルムなどのポリオレフィンフィルムが挙げられる。また、剥離層は、例えば剥離層形成用組成物から形成することができる。剥離層形成用組成物を構成する主な成分（樹脂）としては、特に限定されるものではないが、シリコーン樹脂、アルキド樹脂、アクリル樹脂、および長鎖アルキル樹脂等が挙げられる。
The release film is preferably composed of a plastic film and a release layer. Examples of the plastic film include polyester films such as polyethylene terephthalate film, polybutylene terephthalate film, and polyethylene naphthalate film, and polyolefin films such as polypropylene film. Further, the release layer can be formed from, for example, a composition for forming a release layer. The main component (resin) constituting the release layer forming composition is not particularly limited, and examples thereof include silicone resin, alkyd resin, acrylic resin, and long-chain alkyl resin.
［液晶セル］
液晶セルは、２枚のセル基板と、それら基板間に挟持された液晶層とを有する。セル基板は、一般にガラスで構成されることが多いが、プラスチック基板であってもよい。その他、本発明の液晶パネルに用いる液晶セル自体は、この分野で採用されている各種のもの（例えば、駆動モードとしてＩＰＳモード、ＶＡモード、ＴＮモードなどのような公知のもの）で構成することができる。 [LCD cell]
The liquid crystal cell has two cell substrates and a liquid crystal layer sandwiched between the substrates. The cell substrate is generally made of glass, but may be a plastic substrate. In addition, the liquid crystal cell itself used in the liquid crystal panel of the present invention shall be composed of various types used in this field (for example, known drive modes such as IPS mode, VA mode, TN mode, etc.). Can be done.
液晶セルは、２枚のセル基板と、それら基板間に挟持された液晶層とを有する。セル基板は、一般にガラスで構成されることが多いが、プラスチック基板であってもよい。その他、本発明の液晶パネルに用いる液晶セル自体は、この分野で採用されている各種のもの（例えば、駆動モードとしてＩＰＳモード、ＶＡモード、ＴＮモードなどのような公知のもの）で構成することができる。 [LCD cell]
The liquid crystal cell has two cell substrates and a liquid crystal layer sandwiched between the substrates. The cell substrate is generally made of glass, but may be a plastic substrate. In addition, the liquid crystal cell itself used in the liquid crystal panel of the present invention shall be composed of various types used in this field (for example, known drive modes such as IPS mode, VA mode, TN mode, etc.). Can be done.
［液晶パネル］
粘着剤層を介して偏光板を液晶セルに貼合することで、液晶パネルを作製することができる。 [LCD panel]
A liquid crystal panel can be manufactured by adhering a polarizing plate to a liquid crystal cell via an adhesive layer.
粘着剤層を介して偏光板を液晶セルに貼合することで、液晶パネルを作製することができる。 [LCD panel]
A liquid crystal panel can be manufactured by adhering a polarizing plate to a liquid crystal cell via an adhesive layer.
以下、実施例により本発明をさらに詳細に説明する。例中の「％」および「部」は、特記のない限り、質量％および質量部である。
Hereinafter, the present invention will be described in more detail by way of examples. Unless otherwise specified, "%" and "part" in the example are mass% and parts by mass.
［厚みの測定］
デジタルマイクロメーター（ＭＨ－１５Ｍ、株式会社ニコン製）を用いて測定した。 [Measurement of thickness]
The measurement was performed using a digital micrometer (MH-15M, manufactured by Nikon Corporation).
デジタルマイクロメーター（ＭＨ－１５Ｍ、株式会社ニコン製）を用いて測定した。 [Measurement of thickness]
The measurement was performed using a digital micrometer (MH-15M, manufactured by Nikon Corporation).
［反り量の測定］
実施例および比較例で作製した２枚の偏光板をガラスセルに貼合したガラスパネルを温度２５℃および湿度９０％の条件で７２時間放置し、その後常温で１時間放置した。さらに、温度４０℃および湿度５５％の条件で２４時間放置した。
前面側偏光板を上側にして二次元測定器（ＮＥＸＩＶ ＶＭＲ－１２０７２、株式会社ニコン製）の測定台上に置いた。次いで、測定台の表面に焦点を合わせ、そこを基準とし、ガラスパネルの４角部、４辺の各中央およびガラスパネル表面の中央に焦点を合わせた。基準とした焦点からの距離を測定した後、測定台からの距離が絶対値で最も長い距離を求めた。ガラスパネルの視認側にパネルの淵が反った反りをプラスの反り、背面側にパネルの淵が反った反りをマイナスの反りとした。実施例および比較例につきそれぞれ２枚の測定サンプルを作製して測定を行い、上記最も長い距離の平均値を反り量とした求めた。 [Measurement of warpage]
A glass panel in which two polarizing plates prepared in Examples and Comparative Examples were bonded to a glass cell was left for 72 hours under the conditions of a temperature of 25 ° C. and a humidity of 90%, and then left at room temperature for 1 hour. Further, it was left for 24 hours under the conditions of a temperature of 40 ° C. and a humidity of 55%.
The polarizing plate on the front side was placed on the measuring table of a two-dimensional measuring instrument (NEXIV VMR-12072, manufactured by Nikon Corporation) with the polarizing plate on the upper side. Next, the surface of the measuring table was focused, and the four corners of the glass panel, the center of each of the four sides, and the center of the glass panel surface were focused on the surface of the measuring table. After measuring the distance from the reference focal point, the distance from the measuring table was calculated as the longest absolute value. The warp that the edge of the panel warped on the visible side of the glass panel was regarded as a positive warp, and the warp that the edge of the panel warped on the back side was regarded as a negative warp. Two measurement samples were prepared for each of the examples and comparative examples, and measurements were performed, and the average value of the longest distance was used as the warp amount.
実施例および比較例で作製した２枚の偏光板をガラスセルに貼合したガラスパネルを温度２５℃および湿度９０％の条件で７２時間放置し、その後常温で１時間放置した。さらに、温度４０℃および湿度５５％の条件で２４時間放置した。
前面側偏光板を上側にして二次元測定器（ＮＥＸＩＶ ＶＭＲ－１２０７２、株式会社ニコン製）の測定台上に置いた。次いで、測定台の表面に焦点を合わせ、そこを基準とし、ガラスパネルの４角部、４辺の各中央およびガラスパネル表面の中央に焦点を合わせた。基準とした焦点からの距離を測定した後、測定台からの距離が絶対値で最も長い距離を求めた。ガラスパネルの視認側にパネルの淵が反った反りをプラスの反り、背面側にパネルの淵が反った反りをマイナスの反りとした。実施例および比較例につきそれぞれ２枚の測定サンプルを作製して測定を行い、上記最も長い距離の平均値を反り量とした求めた。 [Measurement of warpage]
A glass panel in which two polarizing plates prepared in Examples and Comparative Examples were bonded to a glass cell was left for 72 hours under the conditions of a temperature of 25 ° C. and a humidity of 90%, and then left at room temperature for 1 hour. Further, it was left for 24 hours under the conditions of a temperature of 40 ° C. and a humidity of 55%.
The polarizing plate on the front side was placed on the measuring table of a two-dimensional measuring instrument (NEXIV VMR-12072, manufactured by Nikon Corporation) with the polarizing plate on the upper side. Next, the surface of the measuring table was focused, and the four corners of the glass panel, the center of each of the four sides, and the center of the glass panel surface were focused on the surface of the measuring table. After measuring the distance from the reference focal point, the distance from the measuring table was calculated as the longest absolute value. The warp that the edge of the panel warped on the visible side of the glass panel was regarded as a positive warp, and the warp that the edge of the panel warped on the back side was regarded as a negative warp. Two measurement samples were prepared for each of the examples and comparative examples, and measurements were performed, and the average value of the longest distance was used as the warp amount.
［透湿度の測定］
低透湿度樹脂層について、恒温恒湿槽を用い、温度４０℃、相対湿度９０％ＲＨ、測定時間２４時間の測定条件で、透湿度試験方法（カップ法、ＪＩＳ Ｚ ０２０８に準じる）により水蒸気透過率を測定し、これを透湿度とした。 [Measurement of moisture permeability]
For the low moisture permeability resin layer, steam permeation by the moisture permeability test method (cup method, according to JIS Z 0208) using a constant temperature and humidity chamber at a temperature of 40 ° C., a relative humidity of 90% RH, and a measurement time of 24 hours. The rate was measured and used as the moisture permeability.
低透湿度樹脂層について、恒温恒湿槽を用い、温度４０℃、相対湿度９０％ＲＨ、測定時間２４時間の測定条件で、透湿度試験方法（カップ法、ＪＩＳ Ｚ ０２０８に準じる）により水蒸気透過率を測定し、これを透湿度とした。 [Measurement of moisture permeability]
For the low moisture permeability resin layer, steam permeation by the moisture permeability test method (cup method, according to JIS Z 0208) using a constant temperature and humidity chamber at a temperature of 40 ° C., a relative humidity of 90% RH, and a measurement time of 24 hours. The rate was measured and used as the moisture permeability.
＜実施例１＞
厚み３０μｍのポリビニルアルコールフィルム（平均重合度約２４００、ケン化度９９．９モル％以上）を乾式延伸により約５倍に縦一軸延伸し、さらに緊張状態を保ったまま、６０℃の純水に１分間浸漬した後、ヨウ素／ヨウ化カリウム／水の重量比が０．０５／５／１００である２８℃の水溶液に６０秒間浸漬した。その後、ヨウ化カリウム／ホウ酸／水の重量比が８．５／８．５／１００である７２℃の水溶液に３００秒間浸漬した。引き続き２６℃の純水で２０秒間洗浄した後、６５℃で乾燥処理を行って、ポリビニルアルコールフィルムにヨウ素が吸着配向している厚み１２μｍの偏光子を得た。 <Example 1>
A polyvinyl alcohol film with a thickness of 30 μm (average degree of polymerization of about 2400, saponification degree of 99.9 mol% or more) was stretched about 5 times vertically and uniaxially by dry stretching, and was further uniaxially stretched to pure water at 60 ° C. while maintaining a tense state. After soaking for 1 minute, it was immersed in an aqueous solution at 28 ° C. having a weight ratio of iodine / potassium iodide / water of 0.05 / 5/100 for 60 seconds. Then, it was immersed in an aqueous solution at 72 ° C. having a weight ratio of potassium iodide / boric acid / water of 8.5 / 8.5 / 100 for 300 seconds. Subsequently, the product was washed with pure water at 26 ° C. for 20 seconds and then dried at 65 ° C. to obtain a polarizing element having a thickness of 12 μm in which iodine was adsorbed and oriented on the polyvinyl alcohol film.
厚み３０μｍのポリビニルアルコールフィルム（平均重合度約２４００、ケン化度９９．９モル％以上）を乾式延伸により約５倍に縦一軸延伸し、さらに緊張状態を保ったまま、６０℃の純水に１分間浸漬した後、ヨウ素／ヨウ化カリウム／水の重量比が０．０５／５／１００である２８℃の水溶液に６０秒間浸漬した。その後、ヨウ化カリウム／ホウ酸／水の重量比が８．５／８．５／１００である７２℃の水溶液に３００秒間浸漬した。引き続き２６℃の純水で２０秒間洗浄した後、６５℃で乾燥処理を行って、ポリビニルアルコールフィルムにヨウ素が吸着配向している厚み１２μｍの偏光子を得た。 <Example 1>
A polyvinyl alcohol film with a thickness of 30 μm (average degree of polymerization of about 2400, saponification degree of 99.9 mol% or more) was stretched about 5 times vertically and uniaxially by dry stretching, and was further uniaxially stretched to pure water at 60 ° C. while maintaining a tense state. After soaking for 1 minute, it was immersed in an aqueous solution at 28 ° C. having a weight ratio of iodine / potassium iodide / water of 0.05 / 5/100 for 60 seconds. Then, it was immersed in an aqueous solution at 72 ° C. having a weight ratio of potassium iodide / boric acid / water of 8.5 / 8.5 / 100 for 300 seconds. Subsequently, the product was washed with pure water at 26 ° C. for 20 seconds and then dried at 65 ° C. to obtain a polarizing element having a thickness of 12 μm in which iodine was adsorbed and oriented on the polyvinyl alcohol film.
次に、この偏光子の両側に、水１００重量部に対し、カルボキシル基変性ポリビニルアルコール〔株式会社クラレ製の「ＫＬ－３１８」〕を３重量部溶解して、ポリビニルアルコール水溶液を調製した水溶液に水溶性ポリアミドエポキシ樹脂〔住友化学株式会社製の「スミレーズレジン（登録商標）６５０（３０）」、固形分濃度３０重量％〕を、水１００重量部に対し、１．５重量部の割合で混合した水系接着剤を厚み２μｍとなるように塗布し、樹脂層として厚さ２５μｍのトリアセチルセルロースフィルム〔コニカミノルタ株式会社製の商品名「ＫＣ２ＵＡ」〕（以下、ＴＡＣともいう）を貼合し、もう一方に樹脂層として厚さ１３μｍの環状オレフィン系樹脂フィルム〔日本ゼオン株式会社製の商品名「ＺＥＯＮＯＲ（登録商標）」、波長５９０ｎｍにおける面内位相差値Ｒe＝０．８ｎｍ
〕（以下、ＣＯＰともいう）を貼り合せ、その後、ＣＯＰ側に５μｍ厚の粘着剤〔アクリル系粘着剤からなる粘着剤層、リンテック株式会社製〕を貼合し、ＴＡＣ／接着剤層／偏光子／接着剤層／ＣＯＰ／粘着剤層の層構成を有する直線偏光板を得た。 Next, 3 parts by weight of carboxyl group-modified polyvinyl alcohol [“KL-318” manufactured by Kuraray Co., Ltd.] was dissolved in 100 parts by weight of water on both sides of the polarizing element to prepare an aqueous solution of polyvinyl alcohol. Water-soluble polyamide epoxy resin [“Smiley's resin (registered trademark) 650 (30)” manufactured by Sumitomo Chemical Co., Ltd., solid content concentration 30% by weight] was added at a ratio of 1.5 parts by weight to 100 parts by weight of water. A mixed water-based adhesive is applied to a thickness of 2 μm, and a 25 μm-thick triacetyl cellulose film [trade name “KC2UA” manufactured by Konica Minolta Co., Ltd.] (hereinafter, also referred to as TAC) is attached as a resin layer. On the other hand, a cyclic olefin resin film with a thickness of 13 μm as a resin layer [trade name “ZEONOR®” manufactured by Nippon Zeon Co., Ltd., in-plane retardation value Re = 0.8 nm at a wavelength of 590 nm
] (Hereinafter, also referred to as COP), and then a 5 μm thick adhesive [adhesive layer made of acrylic adhesive, manufactured by Lintec Corporation] is bonded to the COP side, and TAC / adhesive layer / polarization. A linear polarizing plate having a layer structure of child / adhesive layer / COP / adhesive layer was obtained.
〕（以下、ＣＯＰともいう）を貼り合せ、その後、ＣＯＰ側に５μｍ厚の粘着剤〔アクリル系粘着剤からなる粘着剤層、リンテック株式会社製〕を貼合し、ＴＡＣ／接着剤層／偏光子／接着剤層／ＣＯＰ／粘着剤層の層構成を有する直線偏光板を得た。 Next, 3 parts by weight of carboxyl group-modified polyvinyl alcohol [“KL-318” manufactured by Kuraray Co., Ltd.] was dissolved in 100 parts by weight of water on both sides of the polarizing element to prepare an aqueous solution of polyvinyl alcohol. Water-soluble polyamide epoxy resin [“Smiley's resin (registered trademark) 650 (30)” manufactured by Sumitomo Chemical Co., Ltd., solid content concentration 30% by weight] was added at a ratio of 1.5 parts by weight to 100 parts by weight of water. A mixed water-based adhesive is applied to a thickness of 2 μm, and a 25 μm-thick triacetyl cellulose film [trade name “KC2UA” manufactured by Konica Minolta Co., Ltd.] (hereinafter, also referred to as TAC) is attached as a resin layer. On the other hand, a cyclic olefin resin film with a thickness of 13 μm as a resin layer [trade name “ZEONOR®” manufactured by Nippon Zeon Co., Ltd., in-plane retardation value Re = 0.8 nm at a wavelength of 590 nm
] (Hereinafter, also referred to as COP), and then a 5 μm thick adhesive [adhesive layer made of acrylic adhesive, manufactured by Lintec Corporation] is bonded to the COP side, and TAC / adhesive layer / polarization. A linear polarizing plate having a layer structure of child / adhesive layer / COP / adhesive layer was obtained.
作製した偏光板から前面側偏光板および背面側偏光板を切り出し、以下のようにガラスパネルを作製した。まず視認側偏光板を１３０ｍｍ（偏光子の吸収軸方向）×９０ｍｍ（偏光子の透過軸方向）、背面側偏光板を９０ｍｍ（偏光子の吸収軸方向）×１３０ｍｍ（偏光子の透過軸方向）の寸法となるように裁断した。さらに、ガラスセルの短辺に対して、フロント側偏光板の吸収軸が平行になるように、背面側偏光板に対してガラスセルの長辺に対して吸収軸が平行になるように対角７インチサイズに裁断し、偏光板セットを得た。
The front side polarizing plate and the back side polarizing plate were cut out from the prepared polarizing plate, and a glass panel was prepared as follows. First, the viewing-side polarizing plate is 130 mm (polarizer absorption axis direction) x 90 mm (polarizer transmission axis direction), and the back-side polarizing plate is 90 mm (polarizer absorption axis direction) x 130 mm (polarizer transmission axis direction). It was cut to the size of. Further, diagonal so that the absorption axis of the front polarizing plate is parallel to the short side of the glass cell and the absorption axis is parallel to the long side of the glass cell to the back polarizing plate. It was cut into a 7-inch size to obtain a polarizing plate set.
裁断した一対の偏光板を２つの偏光板の短辺がガラスセルの短辺と平行になるように粘着剤層を介してガラスセルに貼り合わせた。使用したガラスセルの厚みは０．４ｍｍであった。Ｌ１およびＬ２はそれぞれ２０μｍであった。得られたガラスパネルについて反り量の測定を行った。結果を表１に示す。
A pair of cut polarizing plates were attached to the glass cell via an adhesive layer so that the short sides of the two polarizing plates were parallel to the short sides of the glass cell. The thickness of the glass cell used was 0.4 mm. L1 and L2 were 20 μm, respectively. The amount of warpage was measured for the obtained glass panel. The results are shown in Table 1.
＜比較例１＞
実施例１において用いた厚み５μｍの粘着剤層を厚み２５μｍの粘着剤層としたこと以外は実施例１と同様にして偏光板セットを作製した。Ｌ１およびＬ２はそれぞれ４０μｍであった。結果を表１に示す。 <Comparative Example 1>
A polarizing plate set was produced in the same manner as in Example 1 except that the pressure-sensitive adhesive layer having a thickness of 5 μm used in Example 1 was used as a pressure-sensitive adhesive layer having a thickness of 25 μm. L1 and L2 were 40 μm, respectively. The results are shown in Table 1.
実施例１において用いた厚み５μｍの粘着剤層を厚み２５μｍの粘着剤層としたこと以外は実施例１と同様にして偏光板セットを作製した。Ｌ１およびＬ２はそれぞれ４０μｍであった。結果を表１に示す。 <Comparative Example 1>
A polarizing plate set was produced in the same manner as in Example 1 except that the pressure-sensitive adhesive layer having a thickness of 5 μm used in Example 1 was used as a pressure-sensitive adhesive layer having a thickness of 25 μm. L1 and L2 were 40 μm, respectively. The results are shown in Table 1.
１，２ 偏光板セット、１００ 前面側偏光板、１１０，２１０ 樹脂層、１２０，２２０ 貼合層、１３０，２３０ 偏光子、１４０，２４０ 貼合層、１５０，２５０ 低透湿度樹脂層、１６０，２６０ 粘着剤層、２００ 背面側偏光板、３００ 液晶セル、Ｌ１，Ｌ２ 距離
1, 2, polarizing plate set, 100 front side polarizing plate, 110, 210 resin layer, 120, 220 bonded layer, 130, 230 polarizing element, 140, 240 bonded layer, 150, 250 low moisture permeability resin layer, 160, 260 adhesive layer, 200 backside polarizing plate, 300 liquid crystal cell, L1, L2 distance
Claims (8)
- 液晶セルの視認側に配置される前面側偏光板と、前記液晶セルの背面側に配置される背面側偏光板とを含む偏光板セットであって、
前記前面側偏光板及び前記背面側偏光板は偏光子を含み、
前記前面側偏光板に含まれる偏光子の前記液晶セル側の面から前記前面側偏光板の前記液晶セル側の面までの距離をＬ１（μｍ）、及び前記背面側偏光板に含まれる偏光子の前記液晶セル側の面から前記背面側偏光板の前記液晶セル側の面までの距離をＬ２（μｍ）とするとき、前記Ｌ１（μｍ）及び前記Ｌ２（μｍ）の少なくともいずれか一方は３５μｍ以下であり、
前記前面側偏光板及び前記背面側偏光板から選ばれる少なくとも一つは、前記偏光子の前記液晶セル側に、温度４０℃および湿度９０％ＲＨにおける透湿度が４００ｇ／ｍ２・２４ｈｒ以下の樹脂層を有する、偏光板セット。 A polarizing plate set including a front-side polarizing plate arranged on the visual side of a liquid crystal cell and a back-side polarizing plate arranged on the back side of the liquid crystal cell.
The front-side polarizing plate and the back-side polarizing plate include a polarizing element.
The distance from the liquid crystal cell-side surface of the polarizing element included in the front-side polarizing plate to the liquid crystal cell-side surface of the front-side polarizing plate is L1 (μm), and the polarizing element included in the back-side polarizing plate. When the distance from the surface of the liquid crystal cell side to the surface of the back surface side polarizing plate on the liquid crystal cell side is L2 (μm), at least one of the L1 (μm) and the L2 (μm) is 35 μm. Is below
At least one selected from the front-side polarizing plate and the back-side polarizing plate is a resin having a water permeability of 400 g / m 2.24 hr or less at a temperature of 40 ° C. and a humidity of 90% RH on the liquid crystal cell side of the polarizing element. A set of polarizing plates having a layer. - 前記Ｌ１（μｍ）及び前記Ｌ２（μｍ）の和が６０μｍ以下である、請求項１に記載の偏光板セット。 The polarizing plate set according to claim 1, wherein the sum of the L1 (μm) and the L2 (μm) is 60 μm or less.
- 前記Ｌ１（μｍ）及び前記Ｌ２（μｍ）の差の絶対値が３μｍ以下である、請求項１又は２に記載の偏光板セット。 The polarizing plate set according to claim 1 or 2, wherein the absolute value of the difference between L1 (μm) and L2 (μm) is 3 μm or less.
- 前記前面側偏光板及び前記背面側偏光板に含まれる偏光子は、実質的に同じ厚みを有する、請求項１～３のいずれか一項に記載の偏光板セット。 The polarizing plate set according to any one of claims 1 to 3, wherein the polarizing elements contained in the front-side polarizing plate and the back-side polarizing plate have substantially the same thickness.
- 前記前面側偏光板及び前記背面側偏光板はいずれも、前記偏光子の前記液晶セル側に、前記温度４０℃および湿度９０％ＲＨにおける透湿度が４００ｇ／ｍ２・２４ｈｒ以下の樹脂層を有する、請求項１～４のいずれか一項に記載の偏光板セット。 Both the front-side polarizing plate and the back-side polarizing plate have a resin layer having a water permeability of 400 g / m 2.24 hr or less at the temperature of 40 ° C. and a humidity of 90% RH on the liquid crystal cell side of the polarizing element. , The polarizing plate set according to any one of claims 1 to 4.
- 前記前面側偏光板及び前記背面側偏光板はいずれも、前記偏光子の前記液晶セル側に環状シクロオレフィン系樹脂フィルムを含む、請求項１～５のいずれか一項に記載の偏光板セット。 The polarizing plate set according to any one of claims 1 to 5, wherein both the front-side polarizing plate and the back-side polarizing plate include a cyclic cycloolefin-based resin film on the liquid crystal cell side of the polarizing element.
- 前記前面側偏光板及び前記背面側偏光板はいずれも、前記偏光子の前記液晶セルとは反対側にトリアセチルセルロース系樹脂フィルムを含む、請求項１～６のいずれか一項に記載の偏光板セット。 The polarization according to any one of claims 1 to 6, wherein both the front-side polarizing plate and the back-side polarizing plate include a triacetyl cellulose-based resin film on the opposite side of the polarizing element from the liquid crystal cell. Board set.
- 請求項１～７のいずれか一項に記載の偏光板セットと液晶セルとを備える液晶パネル。 A liquid crystal panel including the polarizing plate set according to any one of claims 1 to 7 and a liquid crystal cell.
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| CN202180086352.1A CN116670574A (en) | 2020-12-24 | 2021-12-03 | Polarizing plate group and liquid crystal panel |
| KR1020237023791A KR20230118957A (en) | 2020-12-24 | 2021-12-03 | Polarizer set and liquid crystal panel |
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| JP2020215485A JP2022101098A (en) | 2020-12-24 | 2020-12-24 | Polarizing plate set and liquid crystal panel |
| JP2020-215485 | 2020-12-24 |
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| KR (1) | KR20230118957A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013182070A (en) * | 2012-02-29 | 2013-09-12 | Techno Polymer Co Ltd | Polarizer protective film and polarizing plate |
| JP2016133612A (en) * | 2015-01-19 | 2016-07-25 | 富士フイルム株式会社 | Polarizing plate and liquid crystal display device |
| JP2018180518A (en) * | 2017-04-07 | 2018-11-15 | 住友化学株式会社 | Polarizing plate |
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| JP2018072533A (en) | 2016-10-28 | 2018-05-10 | 住友化学株式会社 | Polarizing plate set and liquid crystal panel |
| JP2017083857A (en) | 2016-12-02 | 2017-05-18 | 住友化学株式会社 | Front plate integrated liquid crystal display panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2013182070A (en) * | 2012-02-29 | 2013-09-12 | Techno Polymer Co Ltd | Polarizer protective film and polarizing plate |
| JP2016133612A (en) * | 2015-01-19 | 2016-07-25 | 富士フイルム株式会社 | Polarizing plate and liquid crystal display device |
| JP2018180518A (en) * | 2017-04-07 | 2018-11-15 | 住友化学株式会社 | Polarizing plate |
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