WO2022130766A1 - Foldable polarizing plate - Google Patents
Foldable polarizing plate Download PDFInfo
- Publication number
- WO2022130766A1 WO2022130766A1 PCT/JP2021/038216 JP2021038216W WO2022130766A1 WO 2022130766 A1 WO2022130766 A1 WO 2022130766A1 JP 2021038216 W JP2021038216 W JP 2021038216W WO 2022130766 A1 WO2022130766 A1 WO 2022130766A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- polarizing plate
- foldable
- film
- less
- Prior art date
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Images
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/023—Optical properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/875—Arrangements for extracting light from the devices
- H10K59/879—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8793—Arrangements for polarized light emission
Definitions
- the present invention relates to a foldable polarizing plate, and also relates to an image display device including the foldable polarizing plate.
- Patent Document 1 proposes a bendable circular polarizing plate including a polarizing element and a retardation film as a member used in a bendable display device.
- the polarizing plate is a laminated film in which a plurality of functional films are laminated, but a thin and hard layer is particularly liable to break due to bending. If such a layer is cracked, panel light may leak from the cracked portion, or if the touch panel or light emitting layer is cracked, display may not be possible.
- An object of the present invention is a foldable polarizing plate which is arranged between a pressure-sensitive adhesive layer laminated adjacent to a window unit and a display module and includes a thin film cured layer having a thickness of 5 ⁇ m or less, and is a display module. It is an object of the present invention to provide a foldable polarizing plate in which cracks and cracks are unlikely to occur even when the side is repeatedly bent with the bending center as the bending center. Another object of the present invention is a foldable polarizing plate including a thin film cured layer in which a linear polarizing layer and a retardation layer are laminated and having a thickness of 5 ⁇ m or less, and the retardation layer side is set with reference to the linear polarizing layer. It is an object of the present invention to provide a foldable polarizing plate in which cracks and cracks are unlikely to occur even when repeatedly bent as a bending center.
- a foldable polarizing plate including a thin film cured layer arranged between a pressure-sensitive adhesive layer laminated adjacent to a window unit and a display module and having a thickness of 5 ⁇ m or less. It is possible to provide a foldable polarizing plate in which cracks and cracks are unlikely to occur even when the display module side is repeatedly bent with the bending center as the bending center. According to another aspect of the present invention, it is a foldable polarizing plate including a thin film cured layer in which a linear polarizing layer and a retardation layer are laminated and having a thickness of 5 ⁇ m or less, and the retardation layer is based on the linear polarizing layer. It is possible to provide a foldable polarizing plate in which cracks and cracks are unlikely to occur even when the side is repeatedly bent with the bending center as the bending center.
- the foldable polarizing plate according to the first aspect includes a thin film cured layer arranged between a pressure-sensitive adhesive layer laminated adjacent to a window unit and a display module and having a thickness of 5 ⁇ m or less.
- This thin film cured layer exists only in the range of 0% or more and 90% or less in the thickness direction from the outermost surface of the foldable polarizing plate on the display module side when the thickness of the foldable polarizing plate is 100%.
- foldable means that the linear polarizing layer in the foldable polarizing plate can be bent along the bending axis when the transmission axis direction is defined as the bending axis.
- the foldable polarizing plate 1 can be bent with the display module side as the inside. Bending includes a form of bending in which a curved surface is formed on the bent portion. In the form of bending, the bending radius of the bent inner surface is not particularly limited. Bending also includes a form of refraction in which the refraction angle of the inner surface is greater than 0 ° and less than 180 °, and a form of folding in which the bending radius of the inner surface is close to zero or the refraction angle of the inner surface is 0 °. ..
- the crack is a crack observed in the thin film cured layer when the foldable polarizing plate is observed in a plan view by the transmitted light of an optical microscope.
- the term “cracking” refers to a crack in a layer other than the thin film cured layer due to a crack in the thin film cured layer. Cracks and cracks can be observed according to the methods described in the Examples section below.
- the number of bendings is preferably 50,000 times. No cracks occur, and more preferably, no cracks occur even at 80,000 times.
- the foldable polarizing plate may be long or single-wafered.
- the foldable polarizing plate is preferably single-leafed.
- the single-wafer-shaped foldable polarizing plate can be obtained by cutting from a long foldable polarizing plate.
- the planar view shape of the foldable polarizing plate 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 length of the long side may be, for example, 10 mm or more and 1400 mm or less, preferably 50 mm or more and 600 mm or less.
- the length of the short side is, for example, 5 mm or more and 800 mm or less, preferably 30 mm or more and 500 mm or less, and more preferably 50 mm or more and 300 mm or less.
- a plan view means a view from the thickness direction of a layer.
- each layer constituting the foldable polarizing plate When the plan view shape of the foldable polarizing plate is a square shape, the lengths of the sides of each layer constituting the foldable polarizing plate may be the same as each other.
- the corners of each layer constituting the foldable polarizing plate may be R-processed, the edges may be notched, or holes may be formed.
- the thickness of the foldable polarizing plate may be, for example, 20 ⁇ m or more and 150 ⁇ m or less, preferably 25 ⁇ m or more and 130 ⁇ m or less.
- the thickness of the foldable polarizing plate is the thickness when the foldable polarizing plate is arranged between the pressure-sensitive adhesive layer laminated adjacent to the window unit and the display module.
- the foldable polarizing plate has an adhesive layer described later on the outermost surface on the display module side for bonding to the display module, and the adhesive layer in which the foldable polarizing plate is laminated adjacent to the window unit and the display module. If there is an adhesive layer when placed between and, the thickness of the foldable polarizing plate includes the thickness of the adhesive layer.
- the foldable polarizing plate can be used for an image display device.
- the image display device may be any such as a liquid crystal display device and an organic EL display device.
- the foldable polarizing plate may be arranged on the front side (visual recognition side) of the image display device, or may be arranged on the back side. Since the foldable polarizing plate of the present invention is bendable, it is suitable for a foldable image display device.
- the foldable polarizing plate can be arranged as a polarizing plate including a polarizing plate arranged on the front side of the front side or the back side of the liquid crystal cell.
- the foldable polarizing plate can be arranged on the front side as a circular polarizing plate arranged on the front side for the purpose of preventing reflection of external light.
- the foldable polarizing plate is a circular polarizing plate
- the foldable polarizing plate can have antireflection performance.
- the image display device by providing a foldable polarizing plate having antireflection performance on the front side of the image display device, it is possible to suppress a decrease in visibility due to reflection of external light.
- the foldable polarizing plate 1 includes a thin film cured layer having a thickness of 5 ⁇ m or less.
- the thin film cured layer can be a layer containing a cured product of a curable resin.
- Examples of the thin film cured layer include a cured resin layer formed on a polarizing element protective layer which is a thermoplastic resin film, a coating protective layer, an adhesive layer for adhering a linear polarizing layer and a polarizing element protective layer, and a phase difference.
- the adhesive layers for adhering the liquid crystal cured layer and the retardation layer contained in the layer those having a thickness of 5 ⁇ m or less can be mentioned. When the thickness of the thin film cured layer exceeds 5 ⁇ m, cracks and cracks tend to easily occur in the thin film cured layer. Layers other than the thin film cured layer will be described later.
- the thickness of the thin film cured layer is preferably 4.5 ⁇ m or less, more preferably 4 ⁇ m or less.
- the thickness of the thin film cured layer 100 is usually 0.5 ⁇ m or more.
- the thin film cured layer exists only in the range T1 of 0% or more and 90% or less in the thickness direction from the outermost surface of the foldable polarizing plate 1 on the display module 4 side when the thickness of the foldable polarizing plate 1 is 100%. Since the thin film cured layer exists only within the range T1, even when the foldable polarizing plate 1 is repeatedly bent with the display module 4 side as the inside, cracks and cracks tend to be less likely to occur.
- the thin film cured layer exists only in the range of preferably 0% or more and 90% or less in the thickness direction from the outermost surface of the foldable polarizing plate 1 on the display module 4 side when the thickness of the foldable polarizing plate 1 is 100%. , More preferably, it is present only in the range of 0% or more and 75% or less, and further preferably, it is present only in the range of 0% or more and 60% or less.
- the Martens hardness of the thin film cured layer at a temperature of 23 ° C. may be, for example, 150 N / mm 2 or more and 800 N / mm 2 or less.
- Martens hardness can be measured according to the method described in the Examples section below.
- the Martens hardness of the thin film cured layer is preferably 150 N / mm 2 or more and 700 N / mm 2 or less, and more preferably 150 N / mm 2 or more and 600 N / mm 2 or less from the viewpoint of resistance to cracking.
- the polarizing element protective layer 100 can be formed from, for example, a thermoplastic resin film or a coating protective layer.
- the foldable polarizing plate 10 may have the polarizing element protection layer 100 on only one side of the linear polarizing layer 103, or may have the polarizing element protection layer 100 on both sides.
- the polarizing element protective layers 100 may be of the same type or different types.
- the polarizing element protective layer 100 is a thermoplastic resin film
- the polarizing element protective layer 100 can be bonded to the linear polarizing layer 103 via an adhesive layer described later.
- the polarizing element protective layer 100 is a thermoplastic resin film
- the polarizing element protective layer 100 can include a cured resin layer 101, which will be described later.
- the foldable polarizing plate 10 preferably contains a thermoplastic resin film.
- thermoplastic resin film The thermoplastic resin film that can be used as the polarizing element protective layer 100 can be incorporated into the foldable polarizing plate 10 in the form of being bonded to one side or both sides of the linear polarizing layer 103.
- 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).
- Methylpentene resin, etc. Cyclic polyolefin resin (Norbornen resin, etc.) and other polyolefin resins; Triacetyl cellulose and other cellulose resins; Polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate and other polyester resins; Polycarbonate resin 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,
- the thickness of the thermoplastic resin film may be, for example, 30 ⁇ m or less, preferably 25 ⁇ m or less from the viewpoint of thinning, and usually 1 ⁇ m or more, preferably 5 ⁇ m or more, and further preferably 15 ⁇ m or more. ..
- the thermoplastic resin film may or may not have a phase difference.
- the cured resin layer 101 is a layer containing a cured product of the curable resin.
- the cured resin layer 101 can be a layer having functions such as a hard coat layer, an antiglare layer, an antireflection layer, a light diffusion layer, an antistatic layer, an antifouling layer, and a conductive layer.
- the curable resin examples include thermosetting resins and active energy ray curable resins.
- the cured product of the curable resin can be formed from a composition for forming a cured resin layer containing the curable resin.
- the composition for forming a curable resin layer may be, for example, a thermosetting composition, a cationic curable composition, a radical curable composition, or the like.
- the composition for forming a cured resin layer can contain, for example, a polymerizable monomer, a polymerization initiator, an additive, a solvent and the like.
- Additives include, for example, plasticizers, UV absorbers, infrared absorbers, colorants such as pigments and dyes, optical brighteners, dispersants, heat stabilizers, light stabilizers, antistatic agents, antioxidants, etc. Examples thereof include lubricants and surfactants.
- the cured resin layer 101 is a hard coat layer, it is possible to easily improve the hardness and scratch property of the linear polarizing layer 103 or the polarizing element protective layer 100.
- the thermoplastic resin film includes a cured resin layer 101 which is a hard coat layer, for example, a composition for forming a hard coat layer is applied and cured on the thermoplastic resin film forming the polarizing element protective layer 100, and the hard coat is applied.
- a thermoplastic resin film provided with a hard coat layer can be produced by forming a cured product of the forming composition, and then bonded to the linear polarizing layer 103 via the adhesive layer 102.
- a thermoplastic resin film provided with a commercially available cured resin layer can also be used as the stator protective layer 100.
- the hard coat layer can be formed from a cured product of a composition for forming a hard coat layer containing an active energy ray-curable resin.
- the active energy ray-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. The additive is not limited, and examples thereof include inorganic fine particles, organic fine particles, or a mixture thereof.
- the hardcourt layer preferably contains a UV absorber.
- UV irradiation treatment, primer coating treatment, saponification treatment and other surface treatments may be performed.
- the coating protective layer may be formed by applying a cationically curable composition such as an epoxy resin or a radically curable composition such as (meth) acrylate and curing it, and is coated with an aqueous solution of a polyvinyl alcohol-based resin or the like. It may be dried, and if necessary, 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, etc. It may contain an antioxidant, an antioxidant, a lubricant and the like.
- a cationically curable composition such as an epoxy resin or a radically curable composition such as (meth) acrylate and curing it, and is coated with an aqueous solution of a polyvinyl alcohol-based resin or the like. It may be dried, and if necessary, a plasticizer, an ultraviolet absorber, an infrared absorber, a colorant such
- the thickness of the polarizing element protective layer 100 may be, for example, 0.1 ⁇ m or more and 30 ⁇ m or less, preferably 0.5 ⁇ m or more and 20 ⁇ m or less, more preferably from the viewpoint of thinning. Is 1 ⁇ m or more and 10 ⁇ m or less.
- the saponification degree of the polyvinyl alcohol-based resin is usually 85 mol% or more and 100 mol% or less, preferably 98 mol% or more.
- the polyvinyl alcohol-based resin may be modified, and for example, polyvinyl formal or polyvinyl acetal 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.
- a film made of such a polyvinyl alcohol-based resin is used as a raw film for a stretched film.
- the method for forming the film of the polyvinyl alcohol-based resin is not particularly limited, and the film can be formed by a known method.
- the film thickness of the polyvinyl alcohol-based raw film may be, for example, 10 ⁇ m or more and 150 ⁇ m or less.
- iodine When iodine is used as a dichroic dye, a method of immersing a polyvinyl alcohol-based resin film in an aqueous solution containing iodine and potassium iodide and dyeing is usually adopted.
- the iodine content in this aqueous solution is usually 0.01 parts by mass or more and 1 part by mass or less per 100 parts by mass of water.
- the content of potassium iodide is usually 0.5 parts by mass or more and 20 parts by mass or less per 100 parts by mass of water.
- the temperature of the aqueous solution used for dyeing is usually 20 ° C. or higher and 40 ° C. or lower.
- the immersion time (staining time) in this aqueous solution is usually 20 seconds or more and 1,800 seconds or less.
- the immersion time in the boric acid aqueous solution is usually 60 seconds or more and 1,200 seconds or less, preferably 150 seconds or more and 600 seconds or less, and more preferably 200 seconds or more and 400 seconds or less.
- the temperature of the boric acid treatment is usually 50 ° C. or higher, preferably 50 ° C. or higher and 85 ° C. or lower, and more preferably 60 ° C. or higher and 80 ° C. or lower.
- the polyvinyl alcohol-based resin film after boric acid treatment is usually washed with water.
- the water washing treatment can be performed, for example, by immersing the boric acid-treated polyvinyl alcohol-based resin film in water.
- the temperature of water in the washing treatment is usually 5 ° C. or higher and 40 ° C. or lower.
- the immersion time is usually 1 second or more and 120 seconds or less.
- a drying treatment is performed to obtain a stretched film on which a dichroic dye is adsorbed.
- the drying process can be performed using, for example, a hot air dryer or a far-infrared heater.
- the temperature of the drying treatment is usually 30 ° C. or higher and 100 ° C. or lower, preferably 50 ° C. or higher and 80 ° C. or lower.
- the drying treatment time is usually 60 seconds or more and 600 seconds or less, preferably 120 seconds or more and 600 seconds or less.
- the water content is usually 5% by mass or more and 20% by mass or less, preferably 8% by mass or more and 15% by mass or less.
- the moisture content is less than 5% by mass, the flexibility of the stretched film on which the dichroic dye is adsorbed is lost, and the stretched film on which the dichroic dye is adsorbed is damaged or broken after drying. Sometimes. Further, if the water content exceeds 20% by mass, the thermal stability of the stretched film on which the dichroic dye is adsorbed may deteriorate.
- a linearly polarizing layer which is a stretched layer on which a dichroic dye is adsorbed (hereinafter, may be abbreviated as “stretched layer”) will be described.
- the stretched layer on which the bicolor dye is adsorbed is usually a step of applying a coating liquid containing the above polyvinyl alcohol resin on a substrate to obtain a laminated film, a step of uniaxially stretching the obtained laminated film, and uniaxial stretching.
- It can be manufactured through a process.
- the base material those exemplified in the description of the polarizing element protective layer described later are applied.
- the base material may be peeled off from the stretched layer, or the base material may be used as a polarizing element protective layer.
- the thickness of the base material may be, for example, 5 ⁇ m or more and 200 ⁇ m or less. When the substrate is incorporated into the foldable polarizing plate 10, the thickness of the substrate film is preferably 30 ⁇ m or less.
- the thickness of the pressure-sensitive adhesive layer may be, for example, in the range of 1 ⁇ m or more and 50 ⁇ m or less, preferably 2 ⁇ m or more and 45 ⁇ m or less, more preferably 3 ⁇ m or more and 30 ⁇ m or less, and further preferably 5 ⁇ m or more and 20 ⁇ m or less.
- the pressure-sensitive adhesive layer 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. Above all, 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) acrylate, (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 is dissolved or dispersed in an organic solvent such as toluene or ethyl acetate to prepare a pressure-sensitive adhesive liquid, which is directly applied to the target surface of a foldable polarizing plate.
- an organic solvent such as toluene or ethyl acetate
- a method for forming an adhesive layer or a sheet-like adhesive layer is formed on a separate film that has been subjected to a mold release treatment, and the adhesive layer is transferred to the target surface of the linear polarizing layer 103 or the retardation layer 105. It can be done by a method or the like.
- 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 retardation layer 105 can be arranged on the bending axis side when the foldable polarizing plate 10 is bent toward the display module side.
- the retardation layer 105 can be laminated on the linear polarizing layer 103 via the bonding layer 104.
- the retardation layer 105 can be a positive A layer such as a ⁇ / 4 layer or a ⁇ / 2 layer, and a positive C layer.
- the retardation layer 103 may be formed from a liquid crystal cured layer, or may be formed from a resin film exemplified as the material of the above-mentioned thermoplastic resin film. When the retardation layer 103 includes a liquid crystal curing layer, the retardation layer 103 may further include an adhesive layer, an alignment layer, and a base material described later.
- the thickness of the retardation layer 105 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 liquid crystal cured layer is a layer of a cured product cured by polymerizing a polymerizable liquid crystal compound.
- the liquid crystal cured layer may be one in which the polymerizable liquid crystal compounds are polymerized with each other in a liquid crystal oriented state.
- the polymerizable liquid crystal compound may be oriented in-plane or vertically. When the polymerizable liquid crystal compound is oriented in the plane, the liquid crystal cured layer becomes a positive A layer showing an in-plane phase difference. When the polymerizable liquid crystal compound is vertically oriented, it becomes a positive C layer showing a phase difference in the thickness direction.
- the polymerizable liquid crystal compound is a compound having a polymerizable group and can be in a liquid crystal state. The polymerizable liquid crystal compound is cured by the reaction between the polymerizable groups of the polymerizable liquid crystal compound and the polymerization of the polymerizable liquid crystal compound.
- the liquid crystal curing layer included in the retardation layer 105 may be one layer, two layers, or three or more layers.
- the liquid crystal curing layers are usually laminated with each other via an adhesive layer.
- the retardation layer 105 includes an alignment layer for orienting a polymerizable liquid crystal compound when forming a base material and / or a liquid crystal curing layer, in addition to a liquid crystal curing layer and an adhesive layer for laminating them. good.
- the substrate is usually removed when the retardation layer 105 is attached to the linear polarizing layer 103.
- the adhesive used for the adhesive layer includes 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, a urethane-based emulsion adhesive, and the like. Water-based adhesives can be mentioned. When the retardation layer contains two or more adhesive layers, the adhesives may be of the same type or of different types. The thickness of the adhesive layer may be, for example, 0.1 ⁇ m or more and 5 ⁇ m or less.
- the type of the polymerizable liquid crystal compound is not particularly limited, but can be classified into a rod-shaped type (rod-shaped liquid crystal compound) and a disk-shaped type (disk-shaped liquid crystal compound, discotic liquid crystal compound) according to its shape. Further, there are a small molecule type and a high molecular type, respectively.
- the polymer generally means a polymer having a degree of polymerization of 100 or more (Polymer Physics / Phase Transition Dynamics, Masao Doi, 2 pages, Iwanami Shoten, 1992). Any polymerizable liquid crystal compound can be used in the present invention.
- rod-shaped liquid crystal compounds two or more kinds of rod-shaped liquid crystal compounds, two or more kinds of disc-shaped liquid crystal compounds, or a mixture of rod-shaped liquid crystal compounds and disc-shaped liquid crystal compounds may be used.
- the rod-shaped liquid crystal compound for example, the compound described in claim 1 of JP-A No. 11-513019 can be preferably used.
- the disk-shaped liquid crystal compound for example, those described in paragraphs [0020] to [0067] of JP-A-2007-108732 or paragraphs [0013]-[0108] of JP-A-2010-244033 are preferable. Can be used.
- the polymerizable liquid crystal compound has a polymerizable group capable of carrying out a polymerization reaction.
- a polymerizable group for example, a functional group capable of an addition polymerization reaction such as a polymerizable ethylenically unsaturated group or a ring-polymerizable group is preferable.
- examples of the polymerizable group include (meth) acryloyl group, vinyl group, styryl group, allyl group and the like. Among them, the (meth) acryloyl group is preferable.
- the (meth) acryloyl group is a concept that includes both a meta-acryloyl group and an acryloyl group.
- the liquid crystal property of the polymerizable liquid crystal compound may be a thermotropic liquid crystal or a lyotropic liquid crystal, and if the thermotropic liquid crystal is classified by order, it may be a nematic liquid crystal or a smectic liquid crystal.
- the liquid crystal cured layer can be formed by applying a composition containing a polymerizable liquid crystal compound (hereinafter, also referred to as a composition for forming a retardation layer) onto, for example, an alignment layer and irradiating it with active energy rays. ..
- a composition for forming a retardation layer may contain components other than the above-mentioned polymerizable liquid crystal compound.
- the composition for forming a retardation layer contains a polymerization initiator.
- a thermal polymerization initiator or a photopolymerization initiator is selected depending on the type of the polymerization reaction.
- examples of the photopolymerization initiator include ⁇ -carbonyl compounds, acyloin ethers, ⁇ -hydrocarbon-substituted aromatic acyloin compounds, polynuclear quinone compounds, and combinations of triarylimidazole dimers and p-aminophenyl ketones.
- the amount of the polymerization initiator used is preferably 0.01% by mass or more and 20% by mass or less, and 0.5% by mass or more and 5% by mass or less, based on the total solid content in the coating liquid. Is more preferable.
- the cured product is a state in which the formed layer alone can exist independently without being deformed or flowed.
- composition for forming a retardation layer may contain a polymerizable monomer from the viewpoint of the uniformity of the coating film and the strength of the film.
- the polymerizable monomer include radically polymerizable or cationically polymerizable compounds. Among them, a polyfunctional radically polymerizable monomer is preferable.
- the polymerizable monomer is preferably one that can be copolymerized with the above-mentioned polymerizable liquid crystal compound.
- the amount of the polymerizable monomer used is preferably 1% by mass or more and 50% by mass or less, and more preferably 2% by mass or more and 30% by mass or less, based on the total mass of the polymerizable liquid crystal compound.
- composition for forming a retardation layer may contain a surfactant from the viewpoint of the uniformity of the coating film and the strength of the film.
- the surfactant include conventionally known compounds. Among them, fluorine-based compounds are particularly preferable.
- composition for forming a retardation layer may contain a solvent, and an organic solvent is preferably used.
- organic solvent include amide (eg, N, N-dimethylformamide), sulfoxide (eg, dimethylsulfoxide), heterocyclic compound (eg, pyridine), hydrocarbon (eg, benzene, hexane), alkyl halide (eg, eg).
- the composition for forming the retardation layer includes a vertical alignment agent such as a polarizing element interface side vertical alignment agent and an air interface side vertical alignment agent, and a polarizing element interface side horizontal alignment agent, an air interface side horizontal alignment agent and the like.
- a vertical alignment agent such as a polarizing element interface side vertical alignment agent and an air interface side vertical alignment agent
- a polarizing element interface side horizontal alignment agent such as the horizontal alignment accelerator
- the composition for forming a retardation layer may contain an adhesion improver, a plasticizer, a polymer and the like in addition to the above components.
- the active energy ray includes ultraviolet rays, visible light, electron beams, and X-rays, and is preferably ultraviolet rays.
- the light source of the active energy ray include a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a xenon lamp, a halogen lamp, a carbon arc lamp, a tungsten lamp, a gallium lamp, an excima laser, and a wavelength range.
- Examples thereof include LED light sources that emit light of 380 to 440 nm, chemical lamps, black light lamps, microwave-excited mercury lamps, metal halide lamps, and the like.
- the irradiation intensity of ultraviolet rays is usually 100 mW / cm 2 or more and 3,000 mW / cm 2 or less in the case of ultraviolet B waves (wavelength range 280 nm or more and 310 nm or less).
- the ultraviolet irradiation intensity is preferably an intensity in a wavelength region effective for activating the cationic polymerization initiator or the radical polymerization initiator.
- the time for irradiating with ultraviolet rays is usually 0.1 seconds or more and 10 minutes or less, preferably 0.1 seconds or more and 5 minutes or less, more preferably 0.1 seconds or more and 3 minutes or less, and further preferably 0. . 1 second or more and 1 minute or less.
- the integrated light amount at a wavelength of 365 nm is preferably 700 mJ / cm 2 or more, more preferably 1,100 mJ / cm 2 or more, and 1,300 mJ / cm 2 or more. It is more preferable to do so.
- the integrated light amount is advantageous for increasing the polymerization rate of the polymerizable liquid crystal compound constituting the liquid crystal cured layer and improving the heat resistance.
- the integrated light amount at a wavelength of 365 nm is preferably 2,000 mJ / cm 2 or less, and more preferably 1,800 mJ / cm 2 or less.
- the integrated light intensity may lead to coloring of the liquid crystal cured layer.
- the thickness of the liquid crystal cured layer is, for example, 0.5 ⁇ m or more and 5 ⁇ m or less. When the thickness of the liquid crystal cured layer is within the above range, sufficient durability can be obtained and the foldable polarizing plate 10 can be contributed to thinning.
- the thickness of the liquid crystal cured layer can be adjusted so as to obtain a desired in-plane retardation value and a retardation value in the thickness direction of the ⁇ / 4 layer, the ⁇ / 2 layer or the positive C layer.
- the retardation layer 105 may include a stack of a plurality of retardation layers having different retardation characteristics. Each retardation layer may be laminated using an adhesive, or a composition containing a polymerizable liquid crystal compound may be applied to the surface of the already formed retardation layer and cured.
- the layer containing the cured product of the polymerizable liquid crystal compound can be formed, for example, on the alignment layer provided on the substrate.
- the base material has a function of supporting the alignment layer and may be a long base material. This base material functions as a releasable support and can support a liquid crystal curing layer or an alignment layer for transfer. Further, it is preferable that the surface has an adhesive force that can be peeled off.
- the base material include a translucent, preferably optically transparent thermoplastic resin film.
- the thermoplastic resin film include those exemplified in the above description of the stator protective layer.
- the base material may be subjected to various blocking prevention treatments.
- the blocking prevention treatment include an easy-adhesion treatment, a treatment of kneading a filler and the like, an embossing treatment (knurling treatment) and the like.
- the layer containing the cured product of the polymerizable liquid crystal compound is formed on the substrate via the alignment layer. That is, the base material and the alignment layer are laminated in this order, and the layer containing the cured product of the polymerizable liquid crystal compound is laminated on the alignment layer.
- the alignment layer is not limited to the vertical alignment layer, and may be an alignment layer that horizontally aligns the molecular axis of the polymerizable liquid crystal compound, or may be an alignment layer that tiltly aligns the molecular axis of the polymerizable liquid crystal compound. ..
- the alignment layer has solvent resistance that does not dissolve due to coating of a composition containing a polymerizable liquid crystal compound, which will be described later, and heat resistance in heat treatment for removing the solvent and aligning the liquid crystal compound. preferable.
- Examples of the alignment layer include an alignment layer containing an orientation polymer, a photoalignment film, and a grub alignment layer in which an uneven pattern or a plurality of grooves are formed and oriented on the surface.
- the thickness of the oriented layer is usually in the range of 10 nm or more and 10,000 nm or less.
- the alignment layer has a function of supporting the liquid crystal cured layer and may function as a releasable support.
- a liquid crystal curing layer for transfer can be supported, and the surface thereof may have an adhesive strength to the extent that it can be peeled off.
- the resin used for the alignment layer a resin obtained by polymerizing a polymerizable compound is used.
- the polymerizable compound is a compound having a polymerizable group, and is usually a non-liquid crystalline non-liquid crystal compound that does not become a liquid crystal state.
- the polymerizable groups of the polymerizable compound react with each other to polymerize the polymerizable compound, thereby forming a resin.
- Such a resin is used as an alignment layer for orienting a polymerizable liquid crystal compound at the stage of forming the liquid crystal cured layer, and if it is not contained in the liquid crystal cured layer, it is used as a material for a known oriented layer.
- the resin is not particularly limited, and a cured product obtained by curing a conventionally known monofunctional or polyfunctional (meth) acrylate-based monomer under a polymerization initiator can be used.
- the (meth) acrylate-based monomer include 2-ethylhexyl acrylate, cyclohexyl acrylate, diethylene glycol mono2-ethylhexyl ether acrylate, diethylene glycol monophenyl ether acrylate, tetraethylene glycol monophenyl ether acrylate, and trimethyl propanetriacrylate.
- Cyclohexyl methacrylate, methacrylic acid, urethane acrylate and the like can be exemplified.
- the resin may be one of these or a mixture of two or more.
- the alignment layer can be peeled off together with the substrate before and after the step of forming the retardation layer and then laminating it with the linear polarizing layer or the like.
- the alignment layer can be included in the liquid crystal curing layer for the purpose of improving the peelability from the substrate and imparting the film strength to the liquid crystal curing layer.
- the liquid crystal cured layer contains an oriented layer, it is preferable to use a cured product obtained by curing a monofunctional or bifunctional (meth) acrylate-based monomer, an imide-based monomer, or a vinyl ether-based monomer as the resin used for the oriented layer.
- Examples of the monofunctional (meth) acrylate-based monomer include alkyl (meth) acrylates having 4 to 16 carbon atoms, ⁇ carboxyalkyl (meth) acrylates having 2 to 14 carbon atoms, and alkylated phenyl (meth) having 2 to 14 carbon atoms. Examples thereof include acrylates, methoxypolyethylene glycol (meth) acrylates, phenoxypolyethylene glycol (meth) acrylates and isobonyl (meth) acrylates.
- bifunctional (meth) acrylate-based monomer examples include 1,3-butanediol di (meth) acrylate; 1,3-butanediol (meth) acrylate; 1,6-hexanediol di (meth) acrylate; ethylene glycol di.
- (Meta) acrylate Diethylene glycol di (meth) acrylate; Neopentyl glycol di (meth) acrylate; Triethylene glycol di (meth) acrylate; Tetraethylene glycol di (meth) acrylate; Polyethylene glycol diacrylate; Loyloxyethyl) ether; ethoxylated bisphenol A di (meth) acrylate; propoxylated neopentyl glycol di (meth) acrylate; ethoxylated neopentyl glycol di (meth) acrylate, 3-methylpentanediol di (meth) acrylate, etc. Can be mentioned.
- the imide-based resin obtained by curing the imide-based monomer examples include polyamide and polyimide.
- the imide-based resin may be one of these or a mixture of two or more.
- the resin forming the alignment layer may contain a monomer other than the monofunctional or bifunctional (meth) acrylate-based monomer, the imide-based monomer and the vinyl ether-based monomer, but the monofunctional or bifunctional (meth)
- the content ratio of the acrylate-based monomer, the imide-based monomer, and the vinyl ether-based monomer may be 50% by mass or more, preferably 55% by mass or more, and more preferably 60% by mass or more in the total monomer. ..
- the thickness of the alignment layer is usually in the range of 10 nm or more and 10,000 nm or less, and when the orientation of the retardation layer 105 is in-plane orientation with respect to the film surface, the alignment layer The thickness is preferably 10 nm or more and 1000 nm or less, and when the orientation of the retardation layer 105 is perpendicular to the film surface, it is preferably 100 nm or more and 10,000 nm or less.
- the thickness of the oriented layer is within the above range, the peelability of the base material can be improved and appropriate film strength can be imparted.
- the foldable polarizing plate 10 may further have, for example, at least one of an adhesive layer and a protective film.
- the foldable polarizing plate 10 may have an adhesive layer arranged on the outermost surface on the retardation layer 105 side.
- the adhesive layer can be a layer for attaching a display module such as a touch sensor panel or an image display element to the foldable polarizing plate 10.
- the adhesive layer can usually be composed of an adhesive.
- the pressure-sensitive adhesive conventionally known pressure-sensitive adhesives can be used without particular limitation, and pressure-sensitive adhesives having a base polymer such as an acrylic polymer, a urethane-based polymer, a silicone-based polymer, and a polyvinyl ether-based polymer can be used. Further, it may be an active energy ray-curable pressure-sensitive adhesive, a thermosetting pressure-sensitive adhesive, or the like.
- the foldable polarizing plate 10 can include a protective film for protecting the surface thereof, typically the surface of the cured resin layer 100.
- the protective film can be arranged on the outermost surface of the foldable polarizing plate 10. After the polarizing plate is attached to, for example, an image display element or another optical member, the protective film is peeled off and removed together with the pressure-sensitive adhesive layer contained therein.
- 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, the foldable polarizing plate 10 tends to be easily imparted with strength.
- FIG. 3 is a schematic cross-sectional view showing another example of the layer structure of the foldable polarizing plate.
- the foldable polarizing plate 20 shown in FIG. 3 includes a polarizing element protective layer 100, a cured resin layer 101, a first adhesive layer 102, a linear polarizing layer 103, a bonded layer 104, and a retardation layer 160. Are prepared in this order.
- the retardation layer 160 includes a first liquid crystal curing layer 161, a second adhesive layer 162, and a second liquid crystal curing layer 163. At least one of the cured resin layer 101, the first adhesive layer 102, the first liquid crystal cured layer 161, the second adhesive layer 162, and the second liquid crystal cured layer 163 can be a thin film cured layer.
- FIG. 4 is a schematic cross-sectional view showing still another example of the layer structure of the foldable polarizing plate.
- the foldable polarizing plate 30 shown in FIG. 4 includes a protective film 180, a polarizing element protective layer 100, a cured resin layer 101, a first adhesive layer 102, a linear polarizing layer 103, and a bonding layer 104.
- the retardation layer 160 is provided in this order.
- the retardation layer 160 includes a first liquid crystal curing layer 161, a second adhesive layer 162, and a second liquid crystal curing layer 163. At least one of the cured resin layer 101, the first adhesive layer 102, the first liquid crystal cured layer 161, the second adhesive layer 162, and the second liquid crystal cured layer 163 can be a thin film cured layer.
- FIG. 5 is a schematic cross-sectional view showing another example of the layer structure of the foldable polarizing plate.
- the foldable polarizing plate 40 shown in FIG. 5 includes a polarizing element protective layer 100, a cured resin layer 101, a first adhesive layer 102, a linear polarizing layer 103, a bonded layer 104, and a retardation layer 160. , And the adhesive layer 170 are provided in this order.
- the retardation layer 160 includes a first liquid crystal curing layer 161, a second adhesive layer 162, and a second liquid crystal curing layer 163. At least one of the cured resin layer 101, the first adhesive layer 102, the first liquid crystal cured layer 161, the second adhesive layer 162, and the second liquid crystal cured layer 163 can be a thin film cured layer.
- the foldable polarizing plate according to the second aspect includes a thin film cured layer in which a linear polarizing layer and a retardation layer are laminated and have a thickness of 5 ⁇ m or less, and the thin film cured layer has a thickness of 100% of the foldable polarizing plate.
- the foldable polarizing plate exists only in the range of 0% or more and 90% or less in the thickness direction from the outermost surface on the retardation layer side with the linear polarizing layer of the foldable polarizing plate as a reference.
- the description in the above-mentioned first aspect is applied.
- the foldable polarizing plate 5 shown in FIG. 6 includes a linear polarizing layer 6 and a retardation layer 7.
- a linear polarizing layer 6 and a retardation layer 7 As for the description of the linearly polarized light layer 6 and the retardation layer 7, the description in the first aspect described above is applied.
- the foldable polarizing plate 5 can be bent with the retardation layer 7 side as the inside with respect to the linear polarizing layer 6.
- the number of bendings is preferable. No cracks occur even at 50,000 times, and more preferably no cracks occur even at 80,000 times.
- the foldable polarizing plate 5 includes a thin film cured layer having a thickness of 5 ⁇ m or less.
- the thin film cured layer can be a layer containing a cured product of a curable resin.
- the thin film cured layer is 0% or more and 90% or less in the thickness direction from the outermost surface on the retardation layer 7 side with the linear polarizing layer 6 of the foldable polarizing plate 5 as a reference. It exists only in the range T2 of. Since the thin film cured layer exists only in the range T2, cracks and cracks are less likely to occur even when the foldable polarizing plate 5 is repeatedly bent with the retardation layer 7 side as the inside with respect to the linear polarizing layer 6 as a reference. It is in.
- the thin film cured layer is preferably 0% or more in the thickness direction from the outermost surface on the retardation layer 7 side with the linear polarizing layer 6 of the foldable polarizing plate 5 as a reference. It exists only in the range of% or less, more preferably exists only in the range of 0% or more and 75% or less, and more preferably exists only in the range of 0% or more and 60% or less.
- FIG. 7 is a schematic cross-sectional view showing an example of the layer structure of the foldable polarizing plate according to the second aspect of the present invention.
- the foldable polarizing plate 50 shown in FIG. 7 includes a polarizing element protective layer 200, a cured resin layer 201, an adhesive layer 202, a linear polarizing layer 203, a bonded layer 204, and a liquid crystal cured layer (not shown). ) Is included in this order.
- At least one of the cured resin layer 201, the adhesive layer 202, and the liquid crystal cured layer can be a thin film cured layer.
- the foldable polarizing plate 50 may further include a layer other than the above-mentioned layer.
- the other layer include a protective film, an adhesive layer and the like.
- the foldable polarizing plate includes a polarizing element protective layer and a retardation layer and includes a cured resin layer as a thin film curing layer
- the foldable polarizing plate is, for example, a polarizing element protective layer which is a thermoplastic resin film including a cured resin layer.
- the bonding step when the layers are bonded to each other via the bonding layer, one or both of the bonding surfaces are subjected to a surface activation treatment such as corona treatment in order to improve the adhesion. Is preferable.
- a surface activation treatment such as corona treatment
- the cured resin layer, the linear polarizing layer and the retardation layer can be manufactured as described above.
- the bonded 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 laminating layer.
- Each layer can be bonded by a method in which an adhesive sheet from which one release film has been peeled off is attached to one layer, then the other release film is peeled off, and the other layer is attached.
- 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 foldable polarizing plate of the present invention can be used in an image display device.
- the image display device is a device having an image display panel, and includes a light emitting element or a light emitting device as a light emitting source. Examples of the image display device include a liquid crystal display device, an organic electroluminescence (EL) display device, an inorganic electroluminescence (EL) display device, a touch panel display device, and the like.
- the foldable polarizing plate can be arranged on the visual side of the image display panel.
- the foldable polarizing plate can be laminated on an image display device, for example, via an adhesive layer.
- the image display device can be a foldable image display device.
- the laminate for a foldable image display device is a laminate for a foldable image display device having a front plate on the visible side of the foldable polarizing plate and a touch panel described later on the side opposite to the front plate of the foldable polarizing plate. be able to.
- the foldable image display device is composed of a foldable image display device laminate and an organic EL display panel.
- the foldable image display device laminate is arranged on the visual side of the organic EL display panel and can be folded. It is configured.
- the laminated body for a foldable image display device may include a foldable polarizing plate and one or both of a front plate and a touch panel, and the stacking order thereof is arbitrary, but the front plate (from the visual recognition side). It is preferable that the window), the foldable polarizing plate, the touch panel, or the front plate, the touch panel, and the foldable polarizing plate are laminated in this order.
- the presence of the foldable polarizing plate on the visual side of the touch panel is preferable because the pattern on the touch panel is less likely to be visually recognized and the visibility of the displayed image is improved.
- Each member can be laminated using an adhesive, an adhesive, or the like. Further, a light-shielding pattern formed on at least one surface of any layer of the front plate, the foldable polarizing plate and the touch panel can be provided.
- a front plate may be arranged on the visual side of the foldable polarizing plate.
- the front plate can be laminated on the foldable polarizing plate via the adhesive layer.
- Examples of the pressure-sensitive adhesive layer include the above-mentioned pressure-sensitive adhesive layer.
- the front plate examples include those having a hard coat layer on at least one surface of glass or a resin film.
- the glass for example, highly transparent glass or tempered glass can be used. Particularly when a thin transparent surface material is used, chemically strengthened glass is preferable.
- the thickness of the glass can be, for example, 20 ⁇ m or more and 5 mm or less.
- the front plate including the hard coat layer on at least one surface of the resin film can be foldable instead of rigid like the existing glass.
- the thickness of the hard coat layer is not particularly limited, and may be, for example, 5 ⁇ m or more and 100 ⁇ m or less.
- the resin film includes a cycloolefin derivative having a unit of a monomer containing a cycloolefin such as norbornene or a polycyclic norbornene-based monomer, and cellulose (diacetylcellulose, triacetylcellulose, acetylcellulosebutyrate, isobutyl ester cellulose).
- an unstretched uniaxial or biaxially stretched film can be used.
- Each of these polymers can be used alone or in combination of two or more.
- Polymethylmethacrylate films and triacetylcellulose and isobutylester cellulose films that are transparent and optically homogeneous are preferred.
- the thickness of the resin film may be 5 ⁇ m or more and 200 ⁇ m or less, preferably 20 ⁇ m or more and 100 ⁇ m or less.
- the light-shielding pattern (bezel) can be formed on the display element side of the front plate.
- the shading pattern can hide each wiring of the display device so that it cannot be seen by the user.
- the color and / or material of the light-shielding pattern is not particularly limited, and can be formed of a resin substance having various colors such as black, white, and gold.
- the thickness of the light-shielding pattern may be 2 ⁇ m or more and 50 ⁇ m or less, preferably 4 ⁇ m or more and 30 ⁇ m or less, and more preferably 6 ⁇ m or more and 15 ⁇ m or less. Further, in order to suppress the mixing of air bubbles due to the step between the light-shielding pattern and the display unit and the visibility of the boundary portion, the light-shielding pattern can be given a shape.
- the touch panel is used as an input means.
- various types such as a resistance film method, a surface acoustic wave method, an infrared ray method, an electromagnetic induction method, and a capacitance method have been proposed, and any method may be used.
- the capacitance method is preferable. It is divided into an active region of the capacitive touch sensor and an inactive region located in the outer portion of the active region.
- the active area is an area corresponding to the area where the screen is displayed on the display panel (display unit), the area where the user's touch is sensed, and the inactive area is the area where the screen is not displayed on the display device (non-active area). This is the area corresponding to the display unit).
- the touch panel has a substrate having foldable characteristics; a sensing pattern formed in an active region of the substrate; and a sensing pattern formed in an inactive region of the substrate, and is connected to an external drive circuit via the sensing pattern and a pad portion.
- Each sensing line for can be included.
- the substrate having foldable characteristics the same material as the transparent substrate of the front plate can be used.
- the layer structure of the laminate for the foldable image display device will be described with reference to FIG.
- the foldable polarizing plate 40, the front plate 121 via the adhesive layer 122 on the visible side of the foldable polarizing plate 40, and the foldable polarizing plate 40 are visually recognized.
- a touch panel 123 is provided on the side opposite to the side via the pressure-sensitive adhesive layer 170.
- the foldable polarizing plate 40 includes a polarizing element protective layer 100, a cured resin layer 101, a first adhesive layer 102, a linear polarizing layer 103, a bonding layer 104, a retardation layer 160, and an adhesive layer 170. Are prepared in this order.
- the retardation layer 160 includes a first liquid crystal curing layer 161, a second adhesive layer 162, and a second liquid crystal curing layer 163. At least one of the cured resin layer 101, the first adhesive layer 102, the first liquid crystal cured layer 161, the second adhesive layer 162, and the second liquid crystal cured layer 163 can be a thin film cured layer.
- the method for evaluating the bending resistance will be described below with reference to FIG.
- the prepared foldable polarizing plate was cut into a size of 10 mm on the short side and 100 mm on the long side using a super cutter so that the long side was in the absorption axis direction of the linear polarizing element, and used as a test piece 300.
- the surface of the test piece 300 (the test piece from which the TAC film was peeled off and removed when the TAC film is arranged on the retardation layer side) is the two plate jigs 301 and 302 of the bending resistance tester.
- the short side was fixed so as to be in contact with (FIG. 9a).
- Kapton film tape (manufactured by Toray DuPont) 303 was used for fixing, and both ends of the test piece were fixed by 10 mm in the long side direction, and the distance L1 between the two plate jigs 301 and 302 was 53 mm. I fixed it so that it would be.
- the distance L2 between the jigs becomes 2R by moving the two plate jigs 301 and 302 in the directions indicated by the arrows A1 and A2, respectively.
- the fixed test piece was continuously changed and bent so that the absorption axis direction of the linear deflector was orthogonal to the bending axis (FIG. 9b).
- the bending speed was 60 rpm, and the number of times of bending until cracks and cracks were generated in the film was measured.
- FISCHERSCOPE HM2000 ultrafine hardness tester
- Example 1 A triacetyl cellulose (TAC) film and an acrylic resin film are bonded to both sides of a linear modulator (PVA, thickness 8 ⁇ m) in which iodine is adsorbed and oriented on a polyvinyl alcohol-based resin film via water, and dried. Both release paper PVA having a layer structure of TAC film / PVA / acrylic resin film was produced.
- TAC triacetyl cellulose
- PVA linear modulator
- a cyclic olefin resin (thickness 3 ⁇ m, maltens hardness 266.843 N / mm 2 ) having an ultraviolet absorber-containing hard coat (HC) layer (thickness 3 ⁇ m, maltens hardness 266.843 N / mm 2) as a polarizing element protective film by peeling off the acrylic resin film side of both release papers PVA ( The hard coat layer side of the COP) film (thickness 22 ⁇ m) was bonded via an adhesive layer (thickness 0.1 ⁇ m, Martens hardness 522.611 N / mm 2 ) made of an aqueous adhesive, and dried in an oven. The bonded surface was subjected to corona treatment (780 W ⁇ 1 pass).
- the TAC film of the linear polarizing plate having the layer structure of the obtained COP film / UV absorber-containing HC layer / adhesive layer / PVA / TAC film was peeled off, and the PVA surface was subjected to corona treatment.
- An adhesive layer (thickness 5 ⁇ m) with a separate film was attached thereto.
- a retardation layer laminate was prepared in which the surfaces were bonded together with an adhesive layer (thickness 2 ⁇ m, Martens hardness 175.665 N / mm 2 ) made of an ultraviolet curable adhesive.
- a hard coat layer an adhesive layer made of a water-based adhesive, a ⁇ / 2 plate, an adhesive layer made of an ultraviolet curable adhesive, and a ⁇ / 4 plate are thin film cured layers, and are displayed.
- the module side is the TAC film side.
- Example 2 Instead of using the UV absorber-containing hard coat (HC) layer (thickness 3 ⁇ m, Martens hardness 266.843 N / mm 2 ) in Example 1, the hard coat (HC) layer (without UV absorber, thickness 2 ⁇ m, Martens).
- Example 3 Instead of using the UV absorber-containing hard coat (HC) layer (thickness 3 ⁇ m, Martens hardness 266.843 N / mm 2 ) in Example 1, the hard coat (HC) layer (no UV absorber, thickness 2 ⁇ m, Martens). Except for the fact that a hardness of 280.775 N / mm 2 ) was used and that the TAC film was peeled off from the foldable polarizing plate and an adhesive layer (thickness 15 ⁇ m) made of an adhesive was attached to the surface on the ⁇ / 4 plate side.
- HC hard coat
- Example 1 instead of laminating PVA on the UV absorber-containing hard coat (HC) layer side of the polarizing element protective film via an adhesive layer, the adhesive layer is interposed on the COP film side of the polarizing element protective film.
- a foldable polarizing plate having a layer structure of a TAC film was obtained. The results are shown in Table 1.
- Example 2 instead of laminating PVA on the hard coat (HC) layer side of the polarizing element protective film via an adhesive layer, PVA is pasted on the COP film side of the polarizing element protective film via an adhesive layer.
- a bull polarizing plate was obtained. The results are shown in Table 1.
- Example 3 PVA is attached to the COP film side of the polarizing element protective film via the adhesive layer instead of attaching PVA to the hard coat (HC) layer side of the polarizing element protective film via the adhesive layer.
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Abstract
Description
本発明の別の目的は、直線偏光層と位相差層とが積層され、厚みが5μm以下である薄膜硬化層を含むフォルダブル偏光板であって、直線偏光層を基準として位相差層側を屈曲中心として繰り返し屈曲した場合であっても、割れやクラックが発生しにくいフォルダブル偏光板を提供することである。 An object of the present invention is a foldable polarizing plate which is arranged between a pressure-sensitive adhesive layer laminated adjacent to a window unit and a display module and includes a thin film cured layer having a thickness of 5 μm or less, and is a display module. It is an object of the present invention to provide a foldable polarizing plate in which cracks and cracks are unlikely to occur even when the side is repeatedly bent with the bending center as the bending center.
Another object of the present invention is a foldable polarizing plate including a thin film cured layer in which a linear polarizing layer and a retardation layer are laminated and having a thickness of 5 μm or less, and the retardation layer side is set with reference to the linear polarizing layer. It is an object of the present invention to provide a foldable polarizing plate in which cracks and cracks are unlikely to occur even when repeatedly bent as a bending center.
[1] ウインドウユニットに隣接して積層された粘着剤層と、表示モジュールとの間に配置されるフォルダブル偏光板であって、
厚みが5μm以下である薄膜硬化層を含み、
前記薄膜硬化層は、前記フォルダブル偏光板の厚みを100%としたとき、前記フォルダブル偏光板の前記表示モジュール側の最外面から前記厚み方向において0%以上90%以内の範囲にのみ存在する、フォルダブル偏光板。
[2] 前記薄膜硬化層の23℃におけるマルテンス硬度は、150N/mm2以上800N/mm2以下である、[1]に記載のフォルダブル偏光板。
[3] 厚みが20μm以上150μm以下である、[1]又は[2]に記載のフォルダブル偏光板。
[4] [1]~[3]のいずれかに記載のフォルダブル偏光板を備える画像表示装置。
[5] 直線偏光層と、位相差層とが積層されたフォルダブル偏光板であって、
厚みが5μm以下である薄膜硬化層を含み、
前記薄膜硬化層は、前記フォルダブル偏光板の厚みを100%としたとき、前記フォルダブル偏光板の前記直線偏光層を基準として前記位相差層側の最外面から前記厚み方向において0%以上90%以内の範囲にのみ存在する、フォルダブル偏光板。 The present invention provides the following foldable polarizing plate and image display device.
[1] A foldable polarizing plate arranged between a pressure-sensitive adhesive layer laminated adjacent to a window unit and a display module.
Includes a thin film cured layer with a thickness of 5 μm or less
The thin film cured layer exists only in the range of 0% or more and 90% or less in the thickness direction from the outermost surface of the foldable polarizing plate on the display module side when the thickness of the foldable polarizing plate is 100%. , Foldable polarizing plate.
[2] The foldable polarizing plate according to [1], wherein the Martens hardness of the thin film cured layer at 23 ° C. is 150 N / mm 2 or more and 800 N / mm 2 or less.
[3] The foldable polarizing plate according to [1] or [2], which has a thickness of 20 μm or more and 150 μm or less.
[4] An image display device including the foldable polarizing plate according to any one of [1] to [3].
[5] A foldable polarizing plate in which a linear polarizing layer and a retardation layer are laminated.
Includes a thin film cured layer with a thickness of 5 μm or less
When the thickness of the foldable polarizing plate is 100%, the thin film cured layer is 0% or more in the thickness direction from the outermost surface on the retardation layer side with respect to the linear polarizing layer of the foldable polarizing plate. Foldable polarizing plate that exists only in the range within%.
本発明の別の態様によれば、直線偏光層と位相差層とが積層され、厚みが5μm以下である薄膜硬化層を含むフォルダブル偏光板であって、直線偏光層を基準として位相差層側を屈曲中心として繰り返し屈曲した場合であっても、割れやクラックが発生しにくいフォルダブル偏光板を提供することができる。 According to one aspect of the present invention, it is a foldable polarizing plate including a thin film cured layer arranged between a pressure-sensitive adhesive layer laminated adjacent to a window unit and a display module and having a thickness of 5 μm or less. It is possible to provide a foldable polarizing plate in which cracks and cracks are unlikely to occur even when the display module side is repeatedly bent with the bending center as the bending center.
According to another aspect of the present invention, it is a foldable polarizing plate including a thin film cured layer in which a linear polarizing layer and a retardation layer are laminated and having a thickness of 5 μm or less, and the retardation layer is based on the linear polarizing layer. It is possible to provide a foldable polarizing plate in which cracks and cracks are unlikely to occur even when the side is repeatedly bent with the bending center as the bending center.
[第一態様]
第一態様に係るフォルダブル偏光板は、ウインドウユニットに隣接して積層された粘着剤層と、表示モジュールとの間に配置され、厚みが5μm以下である薄膜硬化層を備える。この薄膜硬化層は、フォルダブル偏光板の厚みを100%としたとき、フォルダブル偏光板の表示モジュール側の最外面から前記厚み方向において0%以上90%以内の範囲にのみ存在する。 <Foldable polarizing plate>
[First aspect]
The foldable polarizing plate according to the first aspect includes a thin film cured layer arranged between a pressure-sensitive adhesive layer laminated adjacent to a window unit and a display module and having a thickness of 5 μm or less. This thin film cured layer exists only in the range of 0% or more and 90% or less in the thickness direction from the outermost surface of the foldable polarizing plate on the display module side when the thickness of the foldable polarizing plate is 100%.
画像表示装置が有機EL表示装置である場合、フォルダブル偏光板は、外光の反射防止の目的で前面側に配置される円偏光板として前面側に配置されることができる。 When the image display device is a liquid crystal display device, the foldable polarizing plate can be arranged as a polarizing plate including a polarizing plate arranged on the front side of the front side or the back side of the liquid crystal cell.
When the image display device is an organic EL display device, the foldable polarizing plate can be arranged on the front side as a circular polarizing plate arranged on the front side for the purpose of preventing reflection of external light.
フォルダブル偏光板1は、図示されていないが、厚みが5μm以下である薄膜硬化層を含む。薄膜硬化層は、硬化性樹脂の硬化物を含む層であることができる。薄膜硬化層としては、例えば熱可塑性樹脂フィルムである偏光子保護層上に形成される硬化樹脂層、コーティング保護層、直線偏光層と偏光子保護層とを接着するための接着剤層、位相差層に含まれる液晶硬化層及び位相差層同士を接着するための接着剤層のうち、厚みが5μm以下であるもの等が挙げられる。薄膜硬化層の厚みが5μmを超える場合、薄膜硬化層に割れやクラックが生じ易くなる傾向にある。薄膜硬化層以外の層については後述する。 [Thin film hardened layer]
Although not shown, the foldable
偏光子保護層100は、直線偏光層103、特に直線偏光層103の表面を保護するための層である。偏光子保護層100は、直線偏光層103の片側又は両側に、接着剤層のみを介して又は直接、配置されることができる。本明細書において、偏光子保護層100が配置された直線偏光層103は直線偏光板ということがある。 [Polar protector protection layer]
The polarizing element
偏光子保護層100として用いることができる熱可塑性樹脂フィルムは、直線偏光層103の片面又は両面に貼合された形態でフォルダブル偏光板10に組み込まれることができる。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、単独で又は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及び(メタ)アクリル系樹脂フィルムである。 [Thermoplastic resin film]
The thermoplastic resin film that can be used as the polarizing element
硬化樹脂層101は、硬化性樹脂の硬化物を含む層である。硬化樹脂層101は、例えばハードコート層、防眩層、反射防止層、光拡散層、帯電防止層、防汚層、導電層のような機能を有する層であることができる。 [Curing resin layer]
The cured
直線偏光層103と熱可塑性樹脂フィルムである偏光子保護層100(又は硬化樹脂層101)との貼合に用いる接着剤層102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又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から形成することができる。直線偏光層103の両面に熱可塑性樹脂フィルムを貼合する場合、2つの接着剤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。接着剤層の厚みは、例えば0.1μm以上5μm以下であってよい。 [Adhesive layer]
The
コーティング保護層は、例えばエポキシ樹脂等のカチオン硬化性組成物や(メタ)アクリレート等のラジカル硬化性組成物を塗布し、硬化してなるものであってよく、ポリビニルアルコール系樹脂等の水溶液を塗布し、乾燥してなるものであってよく、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。 [Coating protective layer]
The coating protective layer may be formed by applying a cationically curable composition such as an epoxy resin or a radically curable composition such as (meth) acrylate and curing it, and is coated with an aqueous solution of a polyvinyl alcohol-based resin or the like. It may be dried, and if necessary, 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, etc. It may contain an antioxidant, an antioxidant, a lubricant and the like.
直線偏光層103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直線偏光子であることができる。直線偏光層としては、二色性色素を吸着させた延伸フィルム若しくは延伸層が挙げられる。二色性色素として、具体的には、ヨウ素や二色性有機染料が用いられる。二色性有機染料には、C.I.DIRECT RED 39等のジスアゾ化合物からなる二色性直接染料、トリスアゾ、テトラキスアゾなどの化合物からなる二色性直接染料が包含される。 [Linear polarizing layer]
The linear
この水溶液における二色性有機染料の含有量は、水100質量部あたり、通常1×10-4質量部以上10質量部以下であり、好ましくは1×10-3質量部以上1質量部以下であり、さらに好ましくは1×10-3質量部以上1×10-2質量部以下である。この水溶液は、硫酸ナトリウムのような無機塩を染色助剤として含んでいてもよい。染色に用いる二色性染料水溶液の温度は、通常20℃以上80℃以下である。また、この水溶液への浸漬時間(染色時間)は、通常10秒以上1,800秒以下である。 On the other hand, when a dichroic organic dye is used as the dichroic dye, a method of immersing a polyvinyl alcohol-based resin film in an aqueous solution containing a water-soluble dichroic dye and dyeing is usually adopted.
The content of the bicolor organic dye in this aqueous solution is usually 1 × 10 -4 parts by mass or more and 10 parts by mass or less, preferably 1 × 10 -3 parts by mass or more and 1 part by mass or less per 100 parts by mass of water. Yes, more preferably 1 × 10 -3 parts by mass or more and 1 × 10 -2 parts by mass or less. This aqueous solution may contain an inorganic salt such as sodium sulfate as a dyeing aid. The temperature of the dichroic dye aqueous solution used for dyeing is usually 20 ° C. or higher and 80 ° C. or lower. The immersion time (staining time) in this aqueous solution is usually 10 seconds or more and 1,800 seconds or less.
基材の例としては、後述する偏光子保護層の説明において例示するものが適用される。
基材を延伸層から剥離除去してもよく、基材を偏光子保護層としてもよい。基材の厚みは、例えば5μm以上200μm以下であってよい。基材がフォルダブル偏光板10に組み込まれる場合には、基材フィルムの厚みは30μm以下であることが好ましい。 Next, a linearly polarizing layer, which is a stretched layer on which a dichroic dye is adsorbed (hereinafter, may be abbreviated as “stretched layer”) will be described. The stretched layer on which the bicolor dye is adsorbed is usually a step of applying a coating liquid containing the above polyvinyl alcohol resin on a substrate to obtain a laminated film, a step of uniaxially stretching the obtained laminated film, and uniaxial stretching. The step of dyeing the polyvinyl alcohol-based resin layer of the laminated film with a bicolor dye and adsorbing it, the step of treating the film on which the bicolor dye is adsorbed with a boric acid aqueous solution, and washing with water after the treatment with a boric acid aqueous solution. It can be manufactured through a process.
As an example of the base material, those exemplified in the description of the polarizing element protective layer described later are applied.
The base material may be peeled off from the stretched layer, or the base material may be used as a polarizing element protective layer. The thickness of the base material may be, for example, 5 μm or more and 200 μm or less. When the substrate is incorporated into the foldable
直線偏光層103と位相差層105とを貼合するための貼合層104は、通常、感圧式粘着剤(以下、粘着剤ともいう)から形成された粘着剤層であることができる。 [Lated layer]
The
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.
位相差層105は、フォルダブル偏光板10を表示モジュール側に屈曲させたときの屈曲軸側に配置されることができる。位相差層105は、貼合層104を介して直線偏光層103に積層されることができる。位相差層105としては、λ/4層やλ/2層のようなポジティブA層、及びポジティブC層であることができる。位相差層103は、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。位相差層103が液晶硬化層を含む場合、位相差層103は、後述の接着剤層や配向層、基材をさらに含んでいてもよい。 [Phase difference layer]
The
重合性液晶化合物は、重合性基を有する化合物であって、液晶状態となりうる化合物である。重合性液晶化合物の重合性基同士が反応して重合性液晶化合物が重合することにより、重合性液晶化合物が硬化する。 The liquid crystal cured layer is a layer of a cured product cured by polymerizing a polymerizable liquid crystal compound. The liquid crystal cured layer may be one in which the polymerizable liquid crystal compounds are polymerized with each other in a liquid crystal oriented state. The polymerizable liquid crystal compound may be oriented in-plane or vertically. When the polymerizable liquid crystal compound is oriented in the plane, the liquid crystal cured layer becomes a positive A layer showing an in-plane phase difference. When the polymerizable liquid crystal compound is vertically oriented, it becomes a positive C layer showing a phase difference in the thickness direction.
The polymerizable liquid crystal compound is a compound having a polymerizable group and can be in a liquid crystal state. The polymerizable liquid crystal compound is cured by the reaction between the polymerizable groups of the polymerizable liquid crystal compound and the polymerization of the polymerizable liquid crystal compound.
重合性液晶化合物の硬化物を含む層は例えば、基材に設けられた配向層上に形成されることができる。基材は、配向層を支持する機能を有し、長尺に形成されている基材であってもよい。この基材は、離型性支持体として機能し、転写用の液晶硬化層や配向層を支持することができる。さらに、その表面が剥離可能な程度の接着力を有するものが好ましい。基材としては、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が挙げられる。熱可塑性樹脂フィルムとしては、上述の偏光子保護層の説明において例示したものが挙げられる。 [Base material]
The layer containing the cured product of the polymerizable liquid crystal compound can be formed, for example, on the alignment layer provided on the substrate. The base material has a function of supporting the alignment layer and may be a long base material. This base material functions as a releasable support and can support a liquid crystal curing layer or an alignment layer for transfer. Further, it is preferable that the surface has an adhesive force that can be peeled off. Examples of the base material include a translucent, preferably optically transparent thermoplastic resin film. Examples of the thermoplastic resin film include those exemplified in the above description of the stator protective layer.
重合性液晶化合物の硬化物を含む層は、配向層を介して基材上に形成される。すなわち、基材、配向層の順で積層され、重合性液晶化合物の硬化物を含む層は前記配向層上に積層される。 [Orientation layer]
The layer containing the cured product of the polymerizable liquid crystal compound is formed on the substrate via the alignment layer. That is, the base material and the alignment layer are laminated in this order, and the layer containing the cured product of the polymerizable liquid crystal compound is laminated on the alignment layer.
配向層は、位相差層を形成した後、直線偏光層等と積層させる工程の前後において、基材とともに剥離除去することができる。 As the resin used for the alignment layer, a resin obtained by polymerizing a polymerizable compound is used. The polymerizable compound is a compound having a polymerizable group, and is usually a non-liquid crystalline non-liquid crystal compound that does not become a liquid crystal state. The polymerizable groups of the polymerizable compound react with each other to polymerize the polymerizable compound, thereby forming a resin. Such a resin is used as an alignment layer for orienting a polymerizable liquid crystal compound at the stage of forming the liquid crystal cured layer, and if it is not contained in the liquid crystal cured layer, it is used as a material for a known oriented layer. The resin is not particularly limited, and a cured product obtained by curing a conventionally known monofunctional or polyfunctional (meth) acrylate-based monomer under a polymerization initiator can be used. Specifically, examples of the (meth) acrylate-based monomer include 2-ethylhexyl acrylate, cyclohexyl acrylate, diethylene glycol mono2-ethylhexyl ether acrylate, diethylene glycol monophenyl ether acrylate, tetraethylene glycol monophenyl ether acrylate, and trimethyl propanetriacrylate. , Lauryl acrylate, lauryl methacrylate, isobornyl acrylate, isobornyl methacrylate, 2-phenoxyethyl acrylate, tetrahydrofurfuryl acrylate, 2-hydroxypropyl acrylate, benzyl acrylate, tetrahydrofurfuryl methacrylate, 2-hydroxyethyl methacrylate, benzyl methacrylate. , Cyclohexyl methacrylate, methacrylic acid, urethane acrylate and the like can be exemplified. The resin may be one of these or a mixture of two or more.
The alignment layer can be peeled off together with the substrate before and after the step of forming the retardation layer and then laminating it with the linear polarizing layer or the like.
単官能の(メタ)アクリレート系モノマーとしては、炭素数4から16のアルキル(メタ)アクリレート、炭素数2から14のβカルボキシアルキル(メタ)アクリレート、炭素数2から14のアルキル化フェニル(メタ)アクリレート、メトキシポリエチレングリコール(メタ)アクリレート、フェノキシポリエチレングリコール(メタ)アクリレート及びイソボニル(メタ)アクリレート等が挙げられ、
2官能の(メタ)アクリレート系モノマーとしては、1,3-ブタンジオールジ(メタ)アクリレート;1,3-ブタンジオール(メタ)アクリレート;1,6-ヘキサンジオールジ(メタ)アクリレート;エチレングリコールジ(メタ)アクリレート;ジエチレングリコールジ(メタ)アクリレート;ネオペンチルグリコールジ(メタ)アクリレート;トリエチレングリコールジ(メタ)アクリレート;テトラエチレングリコールジ(メタ)アクリレート;ポリエチレングリコールジアクリレート;ビスフェノールAのビス(アクリロイロキシエチル)エーテル;エトキシ化ビスフェノールAジ(メタ)アクリレート;プロポキシ化ネオペンチルグリコールジ(メタ)アクリレート;エトキシ化ネオペンチルグリコールジ(メタ)アクリレート及び3-メチルペンタンジオールジ(メタ)アクリレート等が挙げられる。
また、イミド系モノマーを硬化させたイミド系樹脂としては、ポリアミド、ポリイミド等が挙げられる。なお、イミド系樹脂としては、これらの1種類であってもよいし、2種類以上の混合物であってもよい。
また、配向層を形成する樹脂として、単官能や2官能の(メタ)アクリレート系モノマー、イミド系モノマー及びビニルエーテル系モノマー以外のモノマーを含んでいてもよいが、単官能や2官能の(メタ)アクリレート系モノマー、イミド系モノマー及びビニルエーテル系モノマーの含有割合が、総モノマー中で50質量%以上であってもよく、55質量%以上であることが好ましく、60質量%以上であることがより好ましい。 Further, the alignment layer can be included in the liquid crystal curing layer for the purpose of improving the peelability from the substrate and imparting the film strength to the liquid crystal curing layer. When the liquid crystal cured layer contains an oriented layer, it is preferable to use a cured product obtained by curing a monofunctional or bifunctional (meth) acrylate-based monomer, an imide-based monomer, or a vinyl ether-based monomer as the resin used for the oriented layer.
Examples of the monofunctional (meth) acrylate-based monomer include alkyl (meth) acrylates having 4 to 16 carbon atoms, βcarboxyalkyl (meth) acrylates having 2 to 14 carbon atoms, and alkylated phenyl (meth) having 2 to 14 carbon atoms. Examples thereof include acrylates, methoxypolyethylene glycol (meth) acrylates, phenoxypolyethylene glycol (meth) acrylates and isobonyl (meth) acrylates.
Examples of the bifunctional (meth) acrylate-based monomer include 1,3-butanediol di (meth) acrylate; 1,3-butanediol (meth) acrylate; 1,6-hexanediol di (meth) acrylate; ethylene glycol di. (Meta) acrylate; Diethylene glycol di (meth) acrylate; Neopentyl glycol di (meth) acrylate; Triethylene glycol di (meth) acrylate; Tetraethylene glycol di (meth) acrylate; Polyethylene glycol diacrylate; Loyloxyethyl) ether; ethoxylated bisphenol A di (meth) acrylate; propoxylated neopentyl glycol di (meth) acrylate; ethoxylated neopentyl glycol di (meth) acrylate, 3-methylpentanediol di (meth) acrylate, etc. Can be mentioned.
Examples of the imide-based resin obtained by curing the imide-based monomer include polyamide and polyimide. The imide-based resin may be one of these or a mixture of two or more.
Further, the resin forming the alignment layer may contain a monomer other than the monofunctional or bifunctional (meth) acrylate-based monomer, the imide-based monomer and the vinyl ether-based monomer, but the monofunctional or bifunctional (meth) The content ratio of the acrylate-based monomer, the imide-based monomer, and the vinyl ether-based monomer may be 50% by mass or more, preferably 55% by mass or more, and more preferably 60% by mass or more in the total monomer. ..
フォルダブル偏光板10は、例えば粘着層及びプロテクトフィルムの少なくとも1つをさらに有していてもよい。 [Other layers]
The foldable
フォルダブル偏光板10は、位相差層105側の最外面に粘着層が配置されていてよい。粘着層は、フォルダブル偏光板10にタッチセンサパネルや画像表示素子等の表示モジュールを貼合するための層であることができる。粘着層は通常、粘着剤から構成されることができる。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、アクリル系ポリマー、ウレタン系ポリマー、シリコーン系ポリマー、ポリビニルエーテル系ポリマーなどのベースポリマーを有する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。 [Adhesive layer]
The foldable
フォルダブル偏光板10は、その表面、典型的には硬化樹脂層100の表面を保護するためのプロテクトフィルムを含むことができる。プロテクトフィルムは、フォルダブル偏光板10の最外面に配置されることができる。プロテクトフィルムは、例えば画像表示素子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。 [Protect film]
The foldable
図3は、フォルダブル偏光板の層構成の別の例を示す概略断面図である。図3に示されるフォルダブル偏光板20は、偏光子保護層100と、硬化樹脂層101と、第1接着剤層102と、直線偏光層103と、貼合層104と、位相差層160とをこの順に備える。位相差層160は、第1液晶硬化層161と、第2接着剤層162と、第2液晶硬化層163とを備える。硬化樹脂層101、第1接着剤層102、第1液晶硬化層161、第2接着剤層162及び第2液晶硬化層163の少なくともいずれか1つは薄膜硬化層であることができる。 [Layer structure of foldable polarizing plate]
FIG. 3 is a schematic cross-sectional view showing another example of the layer structure of the foldable polarizing plate. The foldable
第二態様に係るフォルダブル偏光板は、直線偏光層と、位相差層とが積層され、厚みが5μm以下である薄膜硬化層を含み、薄膜硬化層は、フォルダブル偏光板の厚みを100%としたとき、フォルダブル偏光板の直線偏光層を基準として位相差層側の最外面から厚み方向において0%以上90%以内の範囲にのみ存在するフォルダブル偏光板である。フォルダブル偏光板の形状、寸法、厚み及び用途についての説明は、上述の第一態様における説明が適用される。 [Second aspect]
The foldable polarizing plate according to the second aspect includes a thin film cured layer in which a linear polarizing layer and a retardation layer are laminated and have a thickness of 5 μm or less, and the thin film cured layer has a thickness of 100% of the foldable polarizing plate. The foldable polarizing plate exists only in the range of 0% or more and 90% or less in the thickness direction from the outermost surface on the retardation layer side with the linear polarizing layer of the foldable polarizing plate as a reference. As for the description of the shape, size, thickness and use of the foldable polarizing plate, the description in the above-mentioned first aspect is applied.
フォルダブル偏光板5は、図6中に示されていないが、厚みが5μm以下である薄膜硬化層を含む。薄膜硬化層は、硬化性樹脂の硬化物を含む層であることができる。薄膜硬化層の種類、厚み及びマルテンス硬度の例示及び好ましい範囲は、上述の第一態様における説明が適用される。 [Thin film hardened layer]
Although not shown in FIG. 6, the foldable
フォルダブル偏光板が偏光子保護層と位相差層とを含み、薄膜硬化層として硬化樹脂層を備える場合、フォルダブル偏光板は、例えば硬化樹脂層を備える熱可塑性樹脂フィルムである偏光子保護層と直線偏光層とを接着剤層を介して貼合し、次いで直線偏光層の薄膜硬化層側とは反対側に貼合層を介して位相差層を貼合する貼合工程を含む方法によって製造することができる。貼合工程において、貼合層を介して層同士を貼合する場合には、密着性を高めるために、貼合面の一方又は両方に対して、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。硬化樹脂層、直線偏光層及び位相差層はそれぞれ上述のように製造することができる。 [Manufacturing method of foldable polarizing plate]
When the foldable polarizing plate includes a polarizing element protective layer and a retardation layer and includes a cured resin layer as a thin film curing layer, the foldable polarizing plate is, for example, a polarizing element protective layer which is a thermoplastic resin film including a cured resin layer. By a method including a bonding step of bonding the linear polarizing layer and the linear polarizing layer via the adhesive layer, and then bonding the retardation layer via the bonding layer on the side opposite to the thin film cured layer side of the linear polarizing layer. Can be manufactured. In the bonding step, when the layers are bonded to each other via the bonding layer, one or both of the bonding surfaces are subjected to a surface activation treatment such as corona treatment in order to improve the adhesion. Is preferable. The cured resin layer, the linear polarizing layer and the retardation layer can be manufactured as described above.
本発明のフォルダブル偏光板は画像表示装置に用いることができる。画像表示装置とは、画像表示パネルを有する装置であり、発光源として発光素子又は発光装置を含む。画像表示装置としては、例えば液晶表示装置、有機エレクトロルミネッセンス(EL)表示装置、無機エレクトロルミネッセンス(EL)表示装置、タッチパネル表示装置等が挙げられる。フォルダブル偏光板は、画像表示パネルの視認側に配置されることができる。フォルダブル偏光板は、例えば粘着層を介して画像表示装置上に積層することができる。画像表示装置はフォルダブル画像表示装置であることができる。 <Image display device>
The foldable polarizing plate of the present invention can be used in an image display device. The image display device is a device having an image display panel, and includes a light emitting element or a light emitting device as a light emitting source. Examples of the image display device include a liquid crystal display device, an organic electroluminescence (EL) display device, an inorganic electroluminescence (EL) display device, a touch panel display device, and the like. The foldable polarizing plate can be arranged on the visual side of the image display panel. The foldable polarizing plate can be laminated on an image display device, for example, via an adhesive layer. The image display device can be a foldable image display device.
フォルダブル画像表示装置用積層体は、フォルダブル偏光板の視認側に前面板と、フォルダブル偏光板の前面板とは反対側に後述するタッチパネルとを備えるフォルダブル画像表示装置用積層体であることができる。フォルダブル画像表示装置は、フォルダブル画像表示装置用積層体と、有機EL表示パネルとからなり、有機EL表示パネルに対して視認側にフォルダブル画像表示装置用積層体が配置され、折り曲げ可能に構成されている。フォルダブル画像表示装置用積層体としては、フォルダブル偏光板と、前面板及びタッチパネルのいずれか一方又は両方を含んでいてもよく、それらの積層順は任意であるが、視認側から前面板(ウインドウ)、フォルダブル偏光板、タッチパネル、又は前面板、タッチパネル、フォルダブル偏光板の順に積層されていることが好ましい。タッチパネルの視認側にフォルダブル偏光板が存在すると、タッチパネルのパターンが視認されにくくなり表示画像の視認性が良くなるので好ましい。それぞれの部材は接着剤又は粘着剤等を用いて積層することができる。また、前面板、フォルダブル偏光板及びタッチパネルのいずれかの層の少なくとも一面に形成された遮光パターンを具備することができる。 <Laminate for foldable image display device>
The laminate for a foldable image display device is a laminate for a foldable image display device having a front plate on the visible side of the foldable polarizing plate and a touch panel described later on the side opposite to the front plate of the foldable polarizing plate. be able to. The foldable image display device is composed of a foldable image display device laminate and an organic EL display panel. The foldable image display device laminate is arranged on the visual side of the organic EL display panel and can be folded. It is configured. The laminated body for a foldable image display device may include a foldable polarizing plate and one or both of a front plate and a touch panel, and the stacking order thereof is arbitrary, but the front plate (from the visual recognition side). It is preferable that the window), the foldable polarizing plate, the touch panel, or the front plate, the touch panel, and the foldable polarizing plate are laminated in this order. The presence of the foldable polarizing plate on the visual side of the touch panel is preferable because the pattern on the touch panel is less likely to be visually recognized and the visibility of the displayed image is improved. Each member can be laminated using an adhesive, an adhesive, or the like. Further, a light-shielding pattern formed on at least one surface of any layer of the front plate, the foldable polarizing plate and the touch panel can be provided.
フォルダブル偏光板の視認側には前面板を配置してもよい。前面板は、粘着剤層を介してフォルダブル偏光板に積層することができる。粘着剤層としては、例えば前述の粘着層が挙げられる。 [Front plate]
A front plate may be arranged on the visual side of the foldable polarizing plate. The front plate can be laminated on the foldable polarizing plate via the adhesive layer. Examples of the pressure-sensitive adhesive layer include the above-mentioned pressure-sensitive adhesive layer.
遮光パターン(ベゼル)は、前面板における表示素子側に形成することができる。遮光パターンは、表示装置の各配線を隠し使用者に視認されないようにすることができる。遮光パターンの色及び/又は材質は特に制限されることはなく、黒色、白色、金色等の多様な色を有する樹脂物質で形成することができる。一実施形態において、遮光パターンの厚みは2μm以上50μm以下であってもよく、好ましくは4μm以上30μm以下であってもよく、より好ましくは6μm以上15μm以下の範囲であってもよい。また、遮光パターンと表示部の間の段差による気泡混入及び境界部の視認を抑制するために、遮光パターンに形状を付与することができる。 [Shading pattern]
The light-shielding pattern (bezel) can be formed on the display element side of the front plate. The shading pattern can hide each wiring of the display device so that it cannot be seen by the user. The color and / or material of the light-shielding pattern is not particularly limited, and can be formed of a resin substance having various colors such as black, white, and gold. In one embodiment, the thickness of the light-shielding pattern may be 2 μm or more and 50 μm or less, preferably 4 μm or more and 30 μm or less, and more preferably 6 μm or more and 15 μm or less. Further, in order to suppress the mixing of air bubbles due to the step between the light-shielding pattern and the display unit and the visibility of the boundary portion, the light-shielding pattern can be given a shape.
タッチパネルは入力手段として用いられる。タッチパネルが有するタッチセンサとしては、抵抗膜方式、表面弾性波方式、赤外線方式、電磁誘導方式、静電容量方式等様々な様式が提案されており、いずれの方式でも構わない。中でも静電容量方式が好ましい。静電容量方式タッチセンサの活性領域及び前記活性領域の外郭部に位置する非活性領域に区分される。活性領域は表示パネルで画面が表示される領域(表示部)に対応する領域であって、使用者のタッチが感知される領域であり、非活性領域は表示装置で画面が表示されない領域(非表示部)に対応する領域である。タッチパネルはフォルダブルな特性を有する基板と;前記基板の活性領域に形成された感知パターンと;前記基板の非活性領域に形成され、前記感知パターンとパッド部を介して外部の駆動回路と接続するための各センシングラインを含むことができる。フォルダブルな特性を有する基板としては、前面板の透明基板と同様の材料が使用できる。 [Touch panel]
The touch panel is used as an input means. As the touch sensor of the touch panel, various types such as a resistance film method, a surface acoustic wave method, an infrared ray method, an electromagnetic induction method, and a capacitance method have been proposed, and any method may be used. Of these, the capacitance method is preferable. It is divided into an active region of the capacitive touch sensor and an inactive region located in the outer portion of the active region. The active area is an area corresponding to the area where the screen is displayed on the display panel (display unit), the area where the user's touch is sensed, and the inactive area is the area where the screen is not displayed on the display device (non-active area). This is the area corresponding to the display unit). The touch panel has a substrate having foldable characteristics; a sensing pattern formed in an active region of the substrate; and a sensing pattern formed in an inactive region of the substrate, and is connected to an external drive circuit via the sensing pattern and a pad portion. Each sensing line for can be included. As the substrate having foldable characteristics, the same material as the transparent substrate of the front plate can be used.
接触式膜厚測定装置(株式会社ニコン製「MH-15M」)を用いて測定した。 [Layer thickness]
The measurement was performed using a contact type film thickness measuring device (“MH-15M” manufactured by Nikon Corporation).
耐屈曲性の評価方法について図9を参照しながら以下に説明する。作製したフォルダブル偏光板を、長辺が直線偏光子の吸収軸方向となるように、短辺10mm×長辺100mmのサイズにスーパーカッターを用いて裁断し、試験片300とした。試験片300(位相差層側にTACフィルムが配置されている場合、TACフィルムを剥離除去した試験片)の直線偏光子側の面が耐屈曲性試験機の2枚のプレート治具301、302に接するようにして短辺側を固定した(図9a)。固定にはカプトンフィルムテープ(東レ・デュポン製)303を用い、試験片の両端を長辺方向に10mmずつそれそれ固定し、2枚のプレート治具301、302の治具間距離L1が53mmとなるように固定した。次いで試験片の屈曲半径R=1.5mmとしたとき、2枚のプレート治具301、302をそれぞれ矢印A1、A2で示される方向に移動させることにより治具間距離L2が2Rとなるように連続して変化させ、固定した試験片を直線偏光子の吸収軸方向が屈曲軸に直交するように屈曲した(図9b)。屈曲速度は60rpmで行い、フィルムにクラック、ワレが発生するまでの屈曲回数を測定した。 [Bending resistance]
The method for evaluating the bending resistance will be described below with reference to FIG. The prepared foldable polarizing plate was cut into a size of 10 mm on the short side and 100 mm on the long side using a super cutter so that the long side was in the absorption axis direction of the linear polarizing element, and used as a
マルテンス硬度は、超微小硬さ試験機(FISCHERSCOPE HM2000:(株)フィッシャーインストルメンツ製)を用いて測定した。図10に示すように、各層の単膜401(液晶硬化層は支持層がない状態のもの)をソーダガラス402上に静電気を用いて吸着させ、温度23℃にて各層のマルテンス硬度を測定した。ビッカーズ圧子403を使用し、矢印A3方向の押し込み深さは0.2μmで、ISO14577に則したインデンテーション測定による各部材n=3の平均値をマルテンス硬度として求めた。 [Martens hardness]
The Martens hardness was measured using an ultrafine hardness tester (FISCHERSCOPE HM2000: manufactured by Fisher Instruments Co., Ltd.). As shown in FIG. 10, a
ポリビニルアルコール系樹脂フィルムにヨウ素が吸着配向した直線偏光子(PVA、厚み8μm)の両側にトリアセチルセルロース(TAC)フィルムとアクリル樹脂系フィルムとを水を介して貼合し、乾燥することにより、TACフィルム/PVA/アクリル樹脂系フィルムの層構成を有する両剥離紙PVAを作製した。両剥離紙PVAのアクリル樹脂系フィルム側を剥離し、偏光子保護フィルムとしての紫外線吸収剤含有ハードコート(HC)層(厚み3μm、マルテンス硬度266.843N/mm2)を有する環状オレフィン系樹脂(COP)フィルム(厚み22μm)のハードコート層側を水系接着剤からなる接着剤層(厚み0.1μm、マルテンス硬度522.611N/mm2)を介して貼合し、オーブン中で乾燥させた。貼合面にはコロナ処理(780W×1pass)を施した。 <Example 1>
A triacetyl cellulose (TAC) film and an acrylic resin film are bonded to both sides of a linear modulator (PVA, thickness 8 μm) in which iodine is adsorbed and oriented on a polyvinyl alcohol-based resin film via water, and dried. Both release paper PVA having a layer structure of TAC film / PVA / acrylic resin film was produced. A cyclic olefin resin (
TACフィルムに重合性液晶化合物を塗布し硬化させたλ/2板(厚み2μm、マルテンス硬度239.038N/mm2)とλ/4板(厚み1μm、マルテンス硬度214.012N/mm2)の液晶面同士を紫外線硬化型接着剤からなる接着剤層(厚み2μm、マルテンス硬度175.665N/mm2)で貼合した位相差層積層体を作製した。 Next, the TAC film of the linear polarizing plate having the layer structure of the obtained COP film / UV absorber-containing HC layer / adhesive layer / PVA / TAC film was peeled off, and the PVA surface was subjected to corona treatment. An adhesive layer (
Liquid crystal of λ / 2 plate (
実施例1において紫外線吸収剤含有ハードコート(HC)層(厚み3μm、マルテンス硬度266.843N/mm2)を用いたことに代えてハードコート(HC)層(紫外線吸収剤無し、厚み2μm、マルテンス硬度280.775N/mm2)を用いたこと以外は実施例1と同様にしてCOPフィルム/HC層/接着剤層/PVA/粘着剤層/λ/2板/接着剤層/λ/4板/TACフィルムの層構成を有するフォルダブル偏光板(TACフィルムを除く厚み42.1μm)を得た。結果を表1に示す。 <Example 2>
Instead of using the UV absorber-containing hard coat (HC) layer (
実施例1において紫外線吸収剤含有ハードコート(HC)層(厚み3μm、マルテンス硬度266.843N/mm2)を用いたことに代えてハードコート(HC)層(紫外線吸収剤無し、厚み2μm、マルテンス硬度280.775N/mm2)を用いたこと、及びフォルダブル偏光板からTACフィルムを剥離してλ/4板側の面に粘着剤からなる粘着層(厚み15μm)を貼合したこと以外は実施例1と同様にして、COPフィルム/HC層/接着剤層/PVA/粘着剤層/λ/2板/接着剤層/λ/4板/粘着層の層構成を有するフォルダブル偏光板(粘着層を含む厚み57.1μm)を得た。結果を表1に示す。 <Example 3>
Instead of using the UV absorber-containing hard coat (HC) layer (
実施例1において偏光子保護フィルムの紫外線吸収剤含有ハードコート(HC)層側に接着剤層を介してPVAを貼合したことに代えて偏光子保護フィルムのCOPフィルム側に接着剤層を介してPVAを貼合したこと以外は実施例1と同様にして紫外線吸収剤含有HC層/COPフィルム/接着剤層/PVA/粘着剤層/λ/2板/接着剤層/λ/4板/TACフィルムの層構成を有するフォルダブル偏光板を得た。結果を表1に示す。 <Comparative Example 1>
In Example 1, instead of laminating PVA on the UV absorber-containing hard coat (HC) layer side of the polarizing element protective film via an adhesive layer, the adhesive layer is interposed on the COP film side of the polarizing element protective film. HC layer / COP film / adhesive layer / PVA / adhesive layer / λ / 2 board / adhesive layer / λ / 4 board / A foldable polarizing plate having a layer structure of a TAC film was obtained. The results are shown in Table 1.
実施例2において偏光子保護フィルムのハードコート(HC)層側に接着剤層を介してPVAを貼合したことに代えて偏光子保護フィルムのCOPフィルム側に接着剤層を介してPVAを貼合したこと以外は実施例1と同様にしてHC層/COPフィルム/接着剤層/PVA/粘着剤層/λ/2板/接着剤層/λ/4板/TACフィルムの層構成を有するフォルダブル偏光板を得た。結果を表1に示す。 <Comparative Example 2>
In Example 2, instead of laminating PVA on the hard coat (HC) layer side of the polarizing element protective film via an adhesive layer, PVA is pasted on the COP film side of the polarizing element protective film via an adhesive layer. A folder having a layer structure of HC layer / COP film / adhesive layer / PVA / adhesive layer / λ / 2 board / adhesive layer / λ / 4 board / TAC film in the same manner as in Example 1 except that they are matched. A bull polarizing plate was obtained. The results are shown in Table 1.
実施例3において偏光子保護フィルムのハードコート(HC)層側に接着剤層を介してPVAを貼合したことに代えて偏光子保護フィルムのCOPフィルム側に接着剤層を介してPVAを貼合したこと以外は実施例1と同様にしてHC層/COPフィルム/接着剤層/PVA/粘着剤層/λ/2板/接着剤層/λ/4板/粘着層の層構成を有するフォルダブル偏光板を得た。結果を表1に示す。
<Comparative Example 3>
In Example 3, PVA is attached to the COP film side of the polarizing element protective film via the adhesive layer instead of attaching PVA to the hard coat (HC) layer side of the polarizing element protective film via the adhesive layer. A folder having a layer structure of HC layer / COP film / adhesive layer / PVA / adhesive layer / λ / 2 plate / adhesive layer / λ / 4 plate / adhesive layer in the same manner as in Example 1 except that they are matched. A bull polarizing plate was obtained. The results are shown in Table 1.
Claims (5)
- ウインドウユニットに隣接して積層された粘着剤層と、表示モジュールとの間に配置されるフォルダブル偏光板であって、
厚みが5μm以下である薄膜硬化層を含み、
前記薄膜硬化層は、前記フォルダブル偏光板の厚みを100%としたとき、前記フォルダブル偏光板の前記表示モジュール側の最外面から前記厚み方向において0%以上90%以内の範囲にのみ存在する、フォルダブル偏光板。 A foldable polarizing plate arranged between a pressure-sensitive adhesive layer laminated adjacent to a window unit and a display module.
Includes a thin film cured layer with a thickness of 5 μm or less
The thin film cured layer exists only in the range of 0% or more and 90% or less in the thickness direction from the outermost surface of the foldable polarizing plate on the display module side when the thickness of the foldable polarizing plate is 100%. , Foldable polarizing plate. - 前記薄膜硬化層の23℃におけるマルテンス硬度は、150N/mm2以上800N/mm2以下である、請求項1に記載のフォルダブル偏光板。 The foldable polarizing plate according to claim 1, wherein the Martens hardness of the thin film cured layer at 23 ° C. is 150 N / mm 2 or more and 800 N / mm 2 or less.
- 厚みが20μm以上150μm以下である、請求項1又は2に記載のフォルダブル偏光板。 The foldable polarizing plate according to claim 1 or 2, wherein the thickness is 20 μm or more and 150 μm or less.
- 請求項1~3のいずれか一項に記載のフォルダブル偏光板を備える画像表示装置。 An image display device provided with the foldable polarizing plate according to any one of claims 1 to 3.
- 直線偏光層と、位相差層とが積層されたフォルダブル偏光板であって、
厚みが5μm以下である薄膜硬化層を含み、
前記薄膜硬化層は、前記フォルダブル偏光板の厚みを100%としたとき、前記フォルダブル偏光板の前記直線偏光層を基準として前記位相差層側の最外面から前記厚み方向において0%以上90%以内の範囲にのみ存在する、フォルダブル偏光板。 A foldable polarizing plate in which a linear polarizing layer and a retardation layer are laminated.
Includes a thin film cured layer with a thickness of 5 μm or less
When the thickness of the foldable polarizing plate is 100%, the thin film cured layer is 0% or more in the thickness direction from the outermost surface on the retardation layer side with respect to the linear polarizing layer of the foldable polarizing plate. Foldable polarizing plate that exists only in the range within%.
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JP2019195991A (en) * | 2018-05-08 | 2019-11-14 | 住友化学株式会社 | Laminate and method for producing the same |
JP2020023145A (en) * | 2018-07-25 | 2020-02-13 | 住友化学株式会社 | Laminate |
JP2020140010A (en) * | 2019-02-27 | 2020-09-03 | 住友化学株式会社 | Laminate and display device |
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US20150177562A1 (en) * | 2013-12-20 | 2015-06-25 | Apple Inc. | Electronic Device Display With Damage-Resistant Polarizer |
WO2017086338A1 (en) * | 2015-11-20 | 2017-05-26 | 日東電工株式会社 | Optical laminated body and organic electroluminescence display device using same |
JP2019195991A (en) * | 2018-05-08 | 2019-11-14 | 住友化学株式会社 | Laminate and method for producing the same |
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CN116841074A (en) * | 2023-06-15 | 2023-10-03 | 成都瑞波科材料科技有限公司 | Curved liquid crystal optical film, preparation method of optical film and liquid crystal display device |
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