Classifications

• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/30—Polarising elements
  • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
  • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
  • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/42—Layered products comprising a layer of synthetic resin comprising condensation resins of aldehydes, e.g. with phenols, ureas or melamines
• • 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
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
  • C09J11/02—Non-macromolecular additives
  • C09J11/06—Non-macromolecular additives organic
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J129/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Adhesives based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Adhesives based on derivatives of such polymers
  • C09J129/02—Homopolymers or copolymers of unsaturated alcohols
  • C09J129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J201/00—Adhesives based on unspecified macromolecular compounds
• • 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
• • G—PHYSICS
  • G02—OPTICS
  • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
  • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
  • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
  • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
  • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
  • G02F1/1333—Constructional arrangements; Manufacturing methods
  • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
• • G—PHYSICS
  • G02—OPTICS
  • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
  • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
  • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
  • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
  • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
  • G02F1/1333—Constructional arrangements; Manufacturing methods
  • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
  • G02F1/133528—Polarisers
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
  • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
  • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
  • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• • 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
• • 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
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
  • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
  • H10K59/80—Constructional details
  • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light

Definitions

• the present invention relates to a polarizing plate. Further, the present invention relates to an image display device in which one surface of the polarizing plate is bonded to an image display cell and the other surface is bonded to a transparent member such as a touch panel or a front plate.
• Liquid crystal display devices are widely used not only for liquid crystal televisions, but also for mobile devices such as personal computers and mobile phones, and in-vehicle applications such as car navigation systems.
• a liquid crystal display device has a liquid crystal panel member in which polarizing plates are attached to both sides of a liquid crystal cell with an adhesive, and display is performed by controlling the light from the backlight member by the liquid crystal panel member.
• organic EL display devices like liquid crystal display devices, have been widely used in mobile applications such as televisions and mobile phones, and in-vehicle applications such as car navigation systems.
• a circular polarizing plate (polarizing element and a ⁇ / 4 plate) is provided on the visible side surface of the image display panel. (Laminated body containing) may be arranged.
• polarizing plates are increasingly mounted on automobiles as members of liquid crystal display devices and organic EL display devices.
• Polarizing plates used in in-vehicle image display devices are often exposed to high-temperature environments and have less change in characteristics at higher temperatures than other mobile applications such as televisions and mobile phones. High temperature durability) is required.
• a front plate such as a transparent resin plate or a glass plate (also referred to as a "window layer” or the like) is further visible side than the polarizing plate of the image display panel.
• the number of configurations that provide ()) is increasing.
• a display device provided with a touch panel a configuration in which a touch panel is provided on the viewing side of the image display panel on the viewing side and a front plate is provided on the viewing side of the image display panel is widely adopted.
• interlayer filler a layer other than the air layer
• an adhesive or a UV curable adhesive is used for the purpose of suppressing deterioration of visibility due to reflection at the interface and adhesively fixing the members to each other (see, for example, Patent Document 1).
• the above-mentioned interlayer filling configuration is widely adopted in mobile applications such as mobile phones, which are often used outdoors.
• a front plate is arranged on the surface of an image display panel, and the space between the panel and the front plate is filled with an adhesive layer or the like. Adoption of the configuration is being considered.
• a heating durability test 200 hours at 95 ° C., etc.
• a significant decrease in transmittance is observed in the central portion of the polarizing plate surface, while the polarizing plate alone alone shows a significant decrease in transmittance.
• Patent Document 2 as a solution to the problem, the amount of water per unit area of the polarizing plate is set to a specified amount or less, and the saturated water absorption amount of the transparent protective film adjacent to the polarizing element is set to a specified amount or less to increase the transmittance.
• a polarizing plate having a water content of the polarizing element having a temperature of 20 ° C. and a relative humidity of 30% or more and an equilibrium water content of a temperature of 20 ° C. and a relative humidity of 50% or less.
• a polarizing plate having a polarizing element in which iodine is adsorbed and oriented on a polyvinyl alcohol-based resin layer and a transparent protective film. It has a urea-based compound-containing layer containing at least one urea-based compound selected from the group consisting of urea, urea derivatives, thiourea and thiourea derivatives.
• a polarizing plate having a water content of the polarizing plate having a temperature of 20 ° C. and a relative humidity of 30% or more and an equilibrium water content of a temperature of 20 ° C. and a relative humidity of 50% or less.
• the total content of the urea-based compound in the urea-based compound-containing layer is 0.1 part by mass or more and 400 parts by mass or less with respect to 100 parts by mass of the polyvinyl alcohol-based resin, according to [6].
• Polarizing plate [8] The polarizing plate according to any one of [5] to [7], wherein the urea-based compound-containing layer has a thickness of 0.01 to 7 ⁇ m. [9] A polarizing plate having a polarizing element in which iodine is adsorbed and oriented on a polyvinyl alcohol-based resin layer and a transparent protective film.
• the polarizing element contains at least one urea-based compound selected from the group consisting of urea, a urea derivative, thiourea and a thiourea derivative.
• a polarizing plate having a water content of the polarizing element having a temperature of 20 ° C. and a relative humidity of 30% or more and an equilibrium water content of a temperature of 20 ° C. and a relative humidity of 50% or less.
• the polarizing element contains at least one urea-based compound selected from the group consisting of urea, a urea derivative, thiourea and a thiourea derivative.
• the polarizing plate is used in an image display device.
• the polarizing plate according to any one of [1] to [10], wherein layers other than the air layer are provided in contact with both surfaces of the polarizing plate in the image display device.
• Production method. [17] The method for producing a polarizing plate according to [2] or [10].
• the polarizing plate of the first embodiment in the present invention is a polarizing element formed by adsorbing and orienting iodine on a polyvinyl alcohol-based resin layer, and at least one urea-based compound selected from urea, urea derivatives, thiourea and thiourea derivatives. It has a urea-based compound layer containing the above and a transparent protective film.
• the polarizing plate according to the present embodiment has at least one of the following features (a) and (b). (A) The water content of the polarizing element is equal to or higher than the equilibrium water content at a temperature of 20 ° C.
• the water content of the polarizing plate is equal to or higher than the equilibrium water content at a temperature of 20 ° C. and a relative humidity of 30%, and equal to or lower than the equilibrium water content at a temperature of 20 ° C. and a relative humidity of 50%.
• the polarizing plate of the present embodiment has at least one of the above-mentioned characteristics (a) and (b), and further has a urea-based compound-containing layer, so that the polarizing plate has a high temperature as a component of an image display device having an interlayer filling structure. Even when exposed to the environment for a long time, the decrease in single transmittance can be suppressed. Since the polarizing plate of the present embodiment has a urea-based compound-containing layer, it is possible to suppress a decrease in the degree of polarization even when the polarizing plate is exposed to a high temperature environment.
• cross loss light loss
• a well-known polarizing element can be used as the polarizing element formed by adsorbing and orienting iodine on the polyvinyl alcohol (hereinafter, also referred to as PVA) -based resin layer of the present invention.
• PVA polyvinyl alcohol
• Such a polarizing element is generally formed by using a PVA-based resin film, dyeing the PVA-based resin film with iodine, and uniaxially stretching the film.
• the PVA-based resin as described above, generally, one obtained by saponifying a polyvinyl acetate-based resin is used.
• the degree of saponification is about 85 mol% or more, preferably about 90 mol% or more, and more preferably about 99 mol% to 100 mol%.
• the polyvinyl acetate-based resin include polyvinyl acetate, which is a homopolymer of vinyl acetate, and a copolymer of vinyl acetate and another monomer copolymerizable therewith, for example, ethylene-vinyl acetate copolymer weight. Coalescence etc. can be mentioned.
• Examples of other copolymerizable monomers include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids and the like.
• the degree of polymerization of the PVA-based resin is 1000 to 10000, preferably 1500 to 5000.
• This PVA-based resin may be modified, and may be, for example, polyvinyl formal, polyvinyl acetal, polyvinyl butyral, etc. modified with aldehydes.
• the method for manufacturing the polarizing element is not particularly limited, but a method of feeding out a polyvinyl alcohol-based resin film wound in a roll shape in advance and performing stretching, dyeing, cross-linking, etc., or a polyvinyl alcohol-based resin and a resin base material for stretching.
• a typical method includes a step of producing a laminated body of the above and stretching the laminated body in the state of the laminated body. In the present invention, any of these methods can be used. Methods for manufacturing these polarizing elements are described in paragraphs [0109] to [0128] of JP-A-2014-48497, and these methods can be used in the present embodiment.
• the thickness of the polarizing element of the present embodiment is preferably 3 to 35 ⁇ m, more preferably 4 to 30 ⁇ m, and even more preferably 5 to 25 ⁇ m.
• the water content of the polarizing element is equal to or higher than the equilibrium water content of a temperature of 20 ° C. and a relative humidity of 30%, and equal to or lower than the equilibrium water content of a temperature of 20 ° C. and a relative humidity of 50%. More preferably, the temperature is 20 ° C. and the relative humidity is 45% or less, more preferably, the temperature is 20 ° C. and the relative humidity is 42% or less, and most preferably the temperature is 20 ° C. and the relative humidity is 38%. It is below the equilibrium moisture content. If the temperature is lower than the equilibrium water content of 20 ° C.
• the handleability of the polarizing element is lowered and the polarizing element is easily cracked.
• the water content of the polarizing element exceeds the equilibrium water content of a temperature of 20 ° C. and a relative humidity of 50%, the transmittance of the polarizing element tends to decrease. It is presumed that when the water content of the polarizer is high, polyene formation of the PVA-based resin is likely to proceed.
• the water content of the polarizing element is the water content of the polarizing element in the polarizing plate.
• the following method is exemplified as a method for confirming whether the water content of the polarizing element is within the range of the equilibrium water content of a temperature of 20 ° C. and a relative humidity of 30% or more and the water content of the polarizing element at a temperature of 20 ° C. and a relative humidity of 50% or less.
• the polarizing element is stored in an environment adjusted to the above temperature and the above relative humidity range and the mass does not change for a certain period of time, it can be considered that the equilibrium with the environment has been reached.
• it can be confirmed by calculating in advance the equilibrium water content of the polarizing element in an environment adjusted to the range of the temperature and the relative humidity, and comparing the water content of the polarizing element with the pre-calculated equilibrium water content.
• the method for manufacturing a polarizing element having a water content of not less than the equilibrium water content of a temperature of 20 ° C. and a relative humidity of 30% and a temperature of 20 ° C. and a relative humidity of 50% or less is not particularly limited. Examples thereof include a method of storing the polarizing element in an environment adjusted to a relative humidity range of 10 minutes or more and 3 hours or less, or a method of heat-treating at 30 ° C. or higher and 90 ° C. or lower.
• a laminated body in which a protective film is laminated on at least one surface of the polarizing element, or a polarizing plate formed by using the polarizing element is provided with the temperature and the relative humidity.
• Examples thereof include a method of storing in an environment adjusted to the above range for 10 minutes or more and 120 hours or less, or a method of heat-treating at 30 ° C. or more and 90 ° C. or less.
• an image display panel in which a polarizing plate is laminated on an image display cell is stored in an environment adjusted to the above temperature and the above relative humidity range for 10 minutes or more and 3 hours or less.
• the front plate may be attached after heating at 30 ° C. or higher and 90 ° C. or lower.
• the water content of the polarizing element shall be adjusted so that the water content is within the above numerical range at the material stage of the polarizing element alone or a laminate of the polarizing element and the protective film and used to form the polarizing plate. Is preferable. If the water content is adjusted after the polarizing plate is formed, the curl becomes too large, and problems may easily occur when the polarizing plate is attached to the image display cell. By constructing a polarizing plate using a polarizing element adjusted to have the above water content at the material stage before forming the polarizing plate, it is easy to obtain a polarizing plate having a polarizing element whose water content satisfies the above numerical range. Can be configured in.
• the water content of the polarizing element in the polarizing plate may be adjusted to be within the above numerical range. In this case, since the polarizing plate is attached to the image display cell, curling is unlikely to occur.
• the water content of the polarizing plate is equal to or more than the equilibrium water content at a temperature of 20 ° C. and a relative humidity of 30%, and is equal to or less than the equilibrium water content at a temperature of 20 ° C. and a relative humidity of 50%.
• the water content of the polarizing plate is preferably equal to or less than the equilibrium water content at a temperature of 20 ° C. and a relative humidity of 45%, more preferably not less than or equal to the equilibrium water content of a temperature of 20 ° C. and a relative humidity of 42%, and further preferably relative to the temperature of 20 ° C.
• the humidity is 38% or less and is equal to or less than the equilibrium moisture content.
• the following method is exemplified as a method for confirming whether the water content of the polarizing plate is within the range of the equilibrium water content of the temperature of 20 ° C. and the relative humidity of 30% or more and the water content of the polarizing plate of the temperature of 20 ° C. and the relative humidity of 50% or less.
• It can be considered that it has reached equilibrium with the environment when it is stored in an environment adjusted to the above temperature and the above relative humidity range and there is no change in mass for a certain period of time.
• it can be confirmed by calculating in advance the equilibrium water content of the polarizing plate in an environment adjusted to the range of the temperature and the relative humidity, and comparing the water content of the polarizing plate with the pre-calculated equilibrium water content.
• the method for producing a polarizing plate having a water content of not less than the equilibrium water content of a temperature of 20 ° C. and a relative humidity of 30% and a temperature of 20 ° C. and a relative humidity of 50% or less is not particularly limited. Examples thereof include a method of storing the polarizing plate in an environment adjusted to a relative humidity range of 10 minutes or more and 3 hours or less, or a method of heat-treating at 30 ° C. or higher and 90 ° C. or lower.
• an image display panel in which a polarizing plate is laminated on an image display cell is stored in an environment adjusted to the above temperature and the above relative humidity range for 10 minutes or more and 3 hours or less.
• the front plate may be attached after heating at 30 ° C. or higher and 90 ° C. or lower.
• the polarizing plate of the present invention has a urea-based compound-containing layer containing at least one urea-based compound selected from urea, a urea derivative, thiourea, and a thiourea derivative.
• the urea-based compound-containing layer is not limited as long as it is a layer containing a urea-based compound, and examples thereof include an adhesive layer and a cured layer.
• the urea-based compound-containing layer may or may not be in contact with the polarizing element, but is preferably in contact with the polarizing element from the viewpoint of further suppressing a decrease in transmittance in a high temperature environment.
• the adhesive layer is preferably a urea-based compound-containing layer from the viewpoint of productivity.
• the adhesive layer is formed by the following adhesive.
• an adhesive layer which is a urea-based compound-containing layer an adhesive layer in which a polarizing element and a protective film are bonded is exemplified. The configuration when the urea-based compound-containing layer is other than the adhesive layer will be described later.
• any suitable adhesive can be used as the adhesive constituting the adhesive layer for adhering the protective film to the polarizing element.
• a water-based adhesive, a solvent-based adhesive, an active energy ray-curable type, or the like can be used, but a water-based adhesive is preferable.
• the adhesive layer is a urea-based compound-containing layer
• the adhesive contains at least one urea-based compound selected from urea, a urea derivative, thiourea, and a thiourea derivative.
• the thickness of the adhesive at the time of application can be set to an arbitrary appropriate value. For example, after curing or heating (drying), an adhesive layer having a desired thickness is set so as to be obtained.
• the thickness of the adhesive layer is preferably 0.01 ⁇ m to 7 ⁇ m, more preferably 0.01 ⁇ m to 5 ⁇ m, still more preferably 0.01 ⁇ m to 2 ⁇ m, and most preferably 0.01 ⁇ m to 1 ⁇ m.
• any suitable water-based adhesive can be adopted.
• a water-based adhesive containing a PVA-based resin PVA-based adhesive
• the average degree of polymerization of the PVA-based resin contained in the water-based adhesive is preferably about 100 to 5500, more preferably 1000 to 4500, from the viewpoint of adhesiveness.
• the average saponification degree is preferably about 85 mol% to 100 mol%, and more preferably 90 mol% to 100 mol% from the viewpoint of adhesiveness.
• the PVA-based resin contained in the water-based adhesive preferably contains an acetoacetyl group, because the PVA-based resin layer and the protective film have excellent adhesion and durability. ..
• the acetoacetyl group-containing PVA-based resin can be obtained, for example, by reacting the PVA-based resin with diketene by an arbitrary method.
• the degree of acetoacetyl group modification of the acetoacetyl group-containing PVA resin is typically 0.1 mol% or more, preferably about 0.1 mol% to 20 mol%.
• the resin concentration of the water-based adhesive is preferably 0.1% by weight to 15% by weight, more preferably 0.5% by weight to 10% by weight.
• the water-soluble PVA-based adhesive that can be preferably used in the present invention may contain a cross-linking agent in addition to the above-mentioned PVA-based resin and urea-based compound, if necessary.
• a cross-linking agent a known cross-linking agent can be used.
• water-soluble epoxy compounds, dialdehydes, isocyanates and the like can be mentioned.
• the cross-linking agent is preferably any one of glyoxal, glyoxyphosphate, and methylolmelamine, and may be glyoxal or glyoxalate. Glyoxal is preferable, and glyoxal is particularly preferable.
• the water-soluble PVA-based adhesive of the present invention may contain an organic solvent.
• alcohols are preferable because they are miscible with water, and methanol or ethanol is more preferable among the alcohols.
• some urea derivatives have low solubility in water, but have sufficient solubility in alcohol.
• one of the preferred embodiments is to dissolve in alcohol to prepare an alcohol solution of the urea derivative, and then add the alcohol solution of the urea derivative to the PVA aqueous solution to prepare an adhesive.
• any suitable adhesive can be used as long as it is an adhesive that can be cured by irradiation with active energy rays.
• the active energy ray-curable adhesive include an ultraviolet curable adhesive and an electron beam-curable adhesive.
• Specific examples of the curing type of the active energy ray-curing adhesive include a radical curing type, a cation curing type, an anion curing type, and a combination thereof (for example, a hybrid of a radical curing type and a cation curing type).
• the active energy ray-curable adhesive includes, for example, a compound (for example, a monomer and / or an oligomer) having a radically polymerizable group such as a (meth) acrylate group or a (meth) acrylamide group as a curing component.
• a compound for example, a monomer and / or an oligomer
• a radically polymerizable group such as a (meth) acrylate group or a (meth) acrylamide group
• Specific examples of the active energy ray-curable adhesive and a curing method thereof are described in, for example, Japanese Patent Application Laid-Open No. 2012-144690.
• the adhesive layer is a urea-based compound-containing layer
• the adhesive layer contains at least one urea-based compound selected from urea, a urea derivative, thiourea and a thiourea derivative.
• a method for incorporating the urea-based compound in the adhesive layer it is preferable to include the urea-based compound in the above-mentioned adhesive.
• a part of the urea compound may be transferred from the adhesive layer to the polarizing element or the like.
• water-soluble and poorly water-soluble urea-based compounds and both urea-based compounds can be used in the present invention.
• a poorly water-soluble urea compound is used as a water-soluble adhesive, it is preferable to devise a dispersion method so that haze does not increase after the adhesive layer is formed.
• the amount of the urea compound added is preferably 0.1 to 400 parts by mass and 1 to 200 parts by mass with respect to 100 parts by mass of PVA. More preferably, it is 3 to 100 parts by mass.
• a urea derivative is a compound in which at least one of the four hydrogen atoms of a urea molecule is substituted with a substituent.
• the substituent is not particularly limited, but is preferably a substituent composed of a carbon atom, a hydrogen atom and an oxygen atom.
• urea derivatives include methyl urea, ethyl urea, propyl urea, butyl urea, isobutyl urea, N-octadecyl urea, 2-hydroxyethyl urea, hydroxyurea, acetylurea, allylurea, and 2-propynyl as monosubstituted ureas.
• Examples thereof include urea, cyclohexyl urea, phenyl urea, 3-hydroxyphenyl urea, (4-methoxyphenyl) urea, benzyl urea, benzoyl urea, o-tolyl urea and p-tolyl urea.
• tetra-substituted urea tetramethylurea, 1,1,3,3-tetraethylurea, 1,1,3,3-tetrabutylurea, 1,3-dimethoxy-1,3-dimethylurea, 1,3-dimethyl- Examples thereof include 2-imidazolidinone and 1,3-dimethyl-3,4,5,6-tetrahydro-2 (1H) -pyrimidinone.
• a thiourea derivative is a compound in which at least one of the four hydrogen atoms of a thiourea molecule is substituted with a substituent.
• the substituent is not particularly limited, but is preferably a substituent composed of a carbon atom, a hydrogen atom and an oxygen atom.
• thiourea derivative as mono-substituted thiourea, N-methylthiourea, ethylthiourea, propylthiourea, isopropylthiourea, 1-butylthiourea, cyclohexylthiourea, N-acetylthiourea, N-allylthiourea, (2).
• Examples of the 3-substituted thiourea include trimethylthiourea, and examples of the 4-substituted thiourea include tetramethylthiourea and 1,1,3,3-tetraethylthiourea.
• urea-based compounds when used in an image display device having an interlayer filling configuration, a decrease in transmittance in a high temperature environment is suppressed and a decrease in degree of polarization is small (a point in which cross loss is suppressed). Therefore, a urea derivative or a thiourea derivative is preferable, and a urea derivative is more preferable.
• a urea derivative or a thiourea derivative is preferable, and a urea derivative is more preferable.
• mono-substituted urea or di-substituted urea is preferable, and mono-substituted urea is more preferable.
• the di-substituted urea includes 1,1-substituted urea and 1,3-substituted urea, but 1,3-substituted urea is more preferable.
• the transparent protective film used in the present invention (hereinafter, also simply referred to as “protective film”) is attached to at least one side of the polarizing element via an adhesive layer.
• This transparent protective film is attached to one side or both sides of the polarizing element, but it is more preferable that the transparent protective film is attached to both sides.
• the protective film is attached to the polarizing element via an adhesive layer which is a urea-based compound-containing layer.
• only the adhesive layer on one side of the adhesive layers on both sides of the polarizing element is the urea-based compound-containing layer of the present invention.
• both of the adhesive layers on both sides are the urea-based compound-containing layers of the present invention.
• polarizing plates having a protective film on only one side of the polarizing element have been developed. Also in this configuration, it is preferable to laminate the protective film via the adhesive layer which is the urea compound-containing layer of the present invention.
• a method for producing a polarizing plate having a protective film on only one side of the polarizing element a method of first producing a polarizing plate in which a protective film is bonded to both sides via an adhesive layer and then peeling off one of the protective films is conceivable.
• the urea-based compound-containing layer of the present invention is the polarizing element. It is more preferable to use it on both sides.
• the adhesive layer on the film side that does not peel off is preferably the urea-based compound-containing layer of the present invention.
• the protective film may have other optical functions at the same time, and may be formed in a laminated structure in which other layers are laminated.
• the film thickness of the protective film at this time is preferably thin from the viewpoint of optical characteristics, but if it is too thin, the strength is lowered and the workability is inferior.
• the appropriate film thickness is 5 to 100 ⁇ m, preferably 10 to 80 ⁇ m, and more preferably 15 to 70 ⁇ m.
• a film such as a cellulose acylate resin film, a polycarbonate resin film, a cycloolefin resin film such as norbornene, a (meth) acrylic polymer film, or a polyester resin film such as polyethylene terephthalate is used. be able to.
• the protective film on at least one side is a cellulose acylate film or (meth) acrylic in terms of moisture permeability. Any of the polymer films is preferable, and a cellulose acylate film is particularly preferable.
• At least one protective film may have a retardation function for the purpose of compensating the viewing angle, and in that case, the film itself may have a retardation function and has a separate retardation layer. It may be a combination of both.
• the film having the retardation function is directly bonded to the polarizing element via an adhesive
• the film is directly bonded to the polarizing element via an adhesive or an adhesive via another protective film bonded to the polarizing element. It may be a structure in which they are pasted together.
• a polarizing element and a urea-based compound-containing layer containing at least one urea-based compound selected from the group consisting of urea, a urea derivative, thiourea and a thiourea derivative are laminated. It has a step and a water content adjusting step.
• the water content adjusting step when producing a polarizing plate having the characteristic (a), the water content of the polarizing element is equal to or higher than the equilibrium water content of a temperature of 20 ° C. and a relative humidity of 30%, and the equilibrium water content of the temperature of 20 ° C. and a relative humidity of 50%.
• the water content of the polarizing element can be adjusted according to the above description of the water content of the polarizing element.
• the water content adjusting step when a polarizing plate having the characteristic (b) is produced, the water content of the polarizing plate is equal to or higher than the equilibrium water content at a temperature of 20 ° C. and a relative humidity of 30%, and the equilibrium water content at a temperature of 20 ° C. and a relative humidity of 50%. Adjust the water content of the polarizing plate so that it is less than or equal to the rate.
• the water content of the polarizing plate can be adjusted according to the description of the water content of the polarizing plate described above.
• the order of the laminating step and the water content adjusting step is not limited, and the laminating step and the water content adjusting step may be performed in parallel.
• the polarizing plate of the present invention is used in various image display devices such as a liquid crystal display device and an organic EL display device.
• the image display device has an interlayer filling structure in which both sides of the polarizing plate are in contact with layers other than the air layer, the transmittance tends to decrease in a high temperature environment.
• the image display device using the polarizing plate of the present invention it is possible to suppress a decrease in the transmittance of the polarizing plate in a high temperature environment even with an interlayer filling configuration.
• An example of the image display device is a configuration having an image display cell, a first pressure-sensitive adhesive layer laminated on the visible side surface of the image display cell, and a polarizing plate laminated on the visible side surface of the first pressure-sensitive adhesive layer. Will be done.
• Such an image display device may further include a second pressure-sensitive adhesive layer laminated on the visible side surface of the polarizing plate, and a transparent member laminated on the surface of the second pressure-sensitive adhesive layer.
• a transparent member is arranged on the visual side of the image display device, the polarizing plate and the image display cell are bonded by a first pressure-sensitive adhesive layer, and the polarizing plate and the transparent member are bonded to each other by a second pressure-sensitive adhesive. It is suitably used for an image display device having an interlayer filling structure in which layers are bonded together. In the present specification, either one or both of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer may be simply referred to as a "sticky agent layer".
• the member used for bonding the polarizing plate and the image display cell and for bonding the polarizing plate and the transparent member is not limited to the pressure-sensitive adhesive layer, and may be an adhesive layer.
• the image display cell examples include a liquid crystal cell and an organic EL cell.
• the liquid crystal cell includes a reflective liquid crystal cell that uses external light, a transmissive liquid crystal cell that uses light from a light source such as a backlight, and a semi-transmissive semi-reflective type that uses both external light and light from a light source. Any of the liquid crystal cells may be used.
• the image display device liquid crystal display device
• the image display device has a polarizing plate arranged on the side opposite to the viewing side of the image display cell (liquid crystal cell), and further arranges the light source. Will be done.
• the polarizing plate on the light source side and the liquid crystal cell are bonded to each other via an appropriate adhesive layer.
• any type such as VA mode, IPS mode, TN mode, STN mode and bend orientation ( ⁇ type) can be used.
• the organic EL cell a cell in which a transparent electrode, an organic light emitting layer, and a metal electrode are sequentially laminated on a transparent substrate to form a light emitting body (organic electroluminescence light emitting body) or the like is preferably used.
• the organic light emitting layer is a laminate of various organic thin films, for example, a laminate of a hole injection layer made of a triphenylamine derivative or the like and a light emitting layer made of a fluorescent organic solid such as anthracene, or a laminate of these.
• Various layer configurations can be adopted, such as a laminate of an electron-injected layer composed of a light-emitting layer and a perylene derivative, or a laminate of a hole-injected layer, a light-emitting layer, and an electron-injected layer.
• An adhesive layer (adhesive sheet) is preferably used for bonding the image display cell and the polarizing plate.
• a method in which a polarizing plate with an adhesive layer having an adhesive layer attached to one surface of the polarizing plate is attached to an image display cell is preferable from the viewpoint of workability and the like.
• the pressure-sensitive adhesive layer can be attached to the polarizing plate by an appropriate method.
• a pressure-sensitive adhesive solution of about 10 to 40% by weight is prepared by dissolving or dispersing the base polymer or its composition in a solvent composed of a single substance or a mixture of appropriate solvents such as toluene and ethyl acetate.
• a method of directly attaching it on a polarizing plate by an appropriate developing method such as a casting method or a coating method, or a method of forming an adhesive layer on a separator according to the above and transferring it to the polarizing plate, etc. can be mentioned.
• ⁇ Adhesive layer> The pressure-sensitive adhesive layer is described in paragraphs [0103] to [0143] of JP-A-2018-025765, and these pressure-sensitive adhesives can be used in the present invention.
• Examples of the transparent member arranged on the visual side of the image display device include a front plate (window layer) and a touch panel.
• a front plate a front plate having appropriate mechanical strength and thickness is used.
• Examples of such a front plate include a transparent resin plate such as an acrylic resin or a polycarbonate resin, or a glass plate.
• a functional layer such as an antireflection layer may be laminated on the visible side of the front plate.
• a hard coat layer may be laminated to increase the physical strength, or a low moisture permeability layer may be laminated to reduce the moisture permeability.
• touch panel various touch panels such as a resistive film method, a capacitance method, an optical method, and an ultrasonic method, a glass plate having a touch sensor function, a transparent resin plate, and the like are used.
• a capacitive touch panel is used as the transparent member, it is preferable that a front plate made of glass or a transparent resin plate is provided on the visual side of the touch panel.
• a pressure-sensitive adhesive or a UV-curable adhesive is preferably used for bonding the polarizing plate and the transparent member.
• the pressure-sensitive adhesive can be attached by an appropriate method.
• the attachment method of the pressure-sensitive adhesive layer used for bonding the image display cell and the polarizing plate described above can be mentioned.
• a dam material is provided so as to surround the peripheral edge on the image display panel in order to prevent the adhesive solution from spreading before curing, and a transparent member is placed on the dam material. Then, the method of injecting the adhesive solution is preferably used. After the injection of the adhesive solution, alignment and defoaming are performed as necessary, and then UV light is irradiated to perform curing.
• the urea-based compound-containing layer preferably contains at least one urea-based compound and a binder.
• the binder include a polymer binder, a thermosetting resin binder, an active energy ray-curable resin binder, and the like, and any of the binders can be preferably used in the present invention.
• the thickness of the urea-based compound-containing layer is preferably 0.1 to 20 ⁇ m, more preferably 0.5 to 15 ⁇ m, and even more preferably 1 to 10 ⁇ m.
• the urea-based compound-containing layer may be laminated directly on the polarizing element or may be laminated via another layer, but the direct lamination and contact with the polarizing element reduces the transmittance in a high temperature environment. It is preferable because it is easy to suppress.
• a polarizing plate having a urea-based compound-containing layer other than the adhesive layer preferably has a transparent protective film on one surface of a small number of polarizing elements via an adhesive layer in terms of increasing the physical strength of the polarizing plate. At this time, the adhesive layer may or may not contain the urea compound, but it is more preferable that the adhesive layer contains the urea compound.
• a polarizing plate having a protective film on only one side of the polarizing element (hereinafter, also referred to as a "polarizing plate with a single-sided protective film”. ) Is being developed. Attempts have been made to laminate a cured layer on a surface of a polarizing element that does not have a protective film, for the purpose of increasing the physical strength in such a configuration. (For example, Japanese Patent Application Laid-Open No. 2011-221185)
• such a cured layer contains a urea compound to form a urea compound-containing layer.
• a cured layer is formed from a curable composition containing an organic solvent, but paragraphs [0020] to [0042] of JP-A-2017-075986 describe the aqueous active energy ray-curable polymer composition. A method of forming such a hardened layer from a solution is described. Since many urea-based compounds are water-soluble, it is one of the preferred embodiments of the present embodiment to include a water-soluble urea-based compound in such a composition to form a urea-based compound-containing layer.
• the polarizing plate of the second embodiment of the present invention is polarized by adsorbing and orienting iodine on a polyvinyl alcohol-based resin layer and containing at least one urea-based compound selected from urea, a urea derivative, thiourea and a thiourea derivative. It has an element and a transparent protective film.
• the polarizing plate according to the present embodiment has at least one of the following features (a) and (b).
• (A) The water content of the polarizing element is equal to or higher than the equilibrium water content at a temperature of 20 ° C. and a relative humidity of 30%, and equal to or lower than the equilibrium water content at a temperature of 20 ° C.
• the water content of the polarizing plate is equal to or higher than the equilibrium water content at a temperature of 20 ° C. and a relative humidity of 30%, and equal to or lower than the equilibrium water content at a temperature of 20 ° C. and a relative humidity of 50%.
• the polarizing plate of the present embodiment has at least one of the above-mentioned characteristics (a) and (b), and is used in an image display device having an interlayer filling structure because the polarizing element contains a urea-based compound. Moreover, even when exposed for a long time in a high temperature environment, it is possible to suppress a decrease in the single transmittance. In the polarizing plate of the present embodiment, since the polarizing element contains a urea-based compound, it is possible to suppress a decrease in the degree of polarization even when the polarizing plate is exposed to a high temperature environment, and it is easy to suppress cross loss.
• the method for producing a polarizing element of the present embodiment includes a step of incorporating a urea-based compound into the polarizing element in the method for producing a polarizing element according to the first embodiment.
• a polarizing element containing a urea-based compound is obtained by producing the polarizing element through a step of applying a urea-based compound-containing solution to at least one surface of the polarizing element and drying the polarizing element. be able to.
• a urea-based compound is immersed in a treatment solution containing a urea-based compound, or a treatment solution is sprayed, flowed down, or dropped onto the PVA-based resin layer. May be contained.
• a method of immersing the PVA-based resin layer in a treatment solution containing a urea-based compound is preferably used.
• the step of immersing the PVA-based resin layer in the treatment solution containing the urea-based compound may be performed at the same time as the steps of swelling, stretching, dyeing, cross-linking, washing, etc. in the method for manufacturing the polarizing element, or may be performed separately from these steps. It may be provided.
• the step of incorporating the urea-based compound into the PVA-based resin layer is preferably performed after the PVA-based resin layer is dyed with iodine, and more preferably performed at the same time as the cross-linking step after dyeing. According to such a method, the hue change is small, and the influence on the optical characteristics of the polarizing element can be reduced.
• the description in the urea compound-containing layer in the first embodiment is applied.
• the polarizing element according to the present embodiment can also be used as the polarizing element of the polarizing plate in the first embodiment.
• the other configurations of the polarizing plate of the present embodiment are the same as those of the first embodiment except that the urea-based compound-containing layer of the first embodiment is an arbitrary component.
• the solvent of the urea-based compound-containing solution used in the present embodiment is preferably water, an organic solvent, or a mixed solution thereof, and more preferably water or a mixed solvent of water and alcohol.
• the solvent is a mixed solvent of water and alcohol
• the alcohol is preferably either methanol or ethanol.
• the urea-based compound is as described in the first embodiment, but the urea-based compound is preferably water-soluble in that the urea-based compound is unlikely to precipitate on the surface of the polarizing element after drying.
• the method for producing a polarizing plate of the present embodiment includes a water content adjusting step.
• the water content adjusting step is the same as the method for manufacturing a polarizing plate in the first embodiment.
• a 40 ⁇ m-thick polyvinyl alcohol film made of polyvinyl alcohol having an average degree of polymerization of about 2,400 and a saponification degree of 99.9 mol% or more was uniaxially stretched about 5 times by a dry method, and further maintained in a tense state. After immersing in pure water at 60 ° C. for 1 minute, it was immersed in an aqueous solution having a weight ratio of iodine / potassium iodide / water of 0.05 / 5/100 at 28 ° C. for 60 seconds.
• urea-based compound solution 10 g of urea was added to 90 g of pure water to obtain a 10 wt% urea aqueous solution (solution 1). Similarly, according to Table 1, urea was replaced with the urea-based compound shown in Table 1, and urea solutions 2 to 4 were prepared.
• Adhesive 1 for Polarizing Plate The PVA solution for adhesive, urea solution 1, pure water and methanol prepared above are blended so as to have a PVA concentration of 3.0%, a methanol concentration of 20% and a urea concentration of 0.5%, and adhesion for a polarizing plate. Agent 1 was obtained.
• Adhesive 2 for Polarizing Plate (Preparation of Adhesive 2 for Polarizing Plate) Similarly, the PVA solution for adhesive, the urea solution 2 shown in Table 1, pure water and methanol are blended so as to have a PVA concentration of 3.0%, a methanol concentration of 20% and a methyl urea concentration of 0.7%. Adhesive 2 for polarizing plate was obtained.
• Adhesive 3 for Polarizing Plate (Preparation of Adhesive 3 for Polarizing Plate) Similarly, the PVA solution for adhesive, the urea solution 3 shown in Table 1, pure water and methanol are blended so as to have a PVA concentration of 3.0%, a methanol concentration of 20% and an ethyl urea concentration of 1.0%. Adhesive 3 for polarizing plate was obtained.
• Adhesive 5 for Polarizing Plate (Preparation of Adhesive 5 for Polarizing Plate) Similarly, a PVA solution for an adhesive, pure water, and methanol were blended so as to have a PVA concentration of 3.0% and a methanol concentration of 20% to obtain an adhesive 5 for a polarizing plate.
• Polarizing plates 2 to 5 were produced in the same manner as the polarizing plate 1 except that the polarizing plate adhesive 1 was replaced with the polarizing plate adhesives 2 to 5.
• the polarizing plates 1 to 5 obtained above were stored at a temperature of 20 ° C. under the conditions of relative humidity of 30%, 35%, 40%, 45%, 50% or 55% for 72 hours. Moisture content was measured using the Karl Fischer method at 66 hours, 69 hours and 72 hours of storage. Under all humidity conditions, the water content values did not change after storage for 66 hours, 69 hours, and 72 hours. Therefore, it can be considered that the water content of the polarizing plates 1 to 5 is the same as the equilibrium water content of the storage environment of 72 hours used in this experimental example.
• the water content of the polarizing plate reaches equilibrium in a certain storage environment, it can be considered that the water content of the polarizing element in the polarizing plate also reaches equilibrium in the storage environment. Further, when the water content of the polarizing element in the polarizing plate reaches equilibrium in a certain storage environment, it can be considered that the water content of the polarizing plate also reaches equilibrium in the storage environment.
• Examples 1 to 9, Comparative Examples 1 to 6 In Examples 1 to 9 and Comparative Examples 1 to 6, the optical laminates shown in Table 2 were used, and the temperature 20 was set so that the water content of the optical laminates used was the equilibrium water content of the environment shown in Table 2. It was stored at ° C. for 72 hours under the conditions of relative humidity of 35%, 40%, 45%, 50% or 55%.
• the water content of the optical laminate can be regarded as reaching equilibrium with the water content of the storage environment, and the water content of the polarizing plate and the polarizing element in the optical laminate is also the same as the water content of the optical laminate. Can be regarded as.
• the optical laminates 1 to 5 produced above are each cut into a size of 50 mm ⁇ 100 mm so that the long side is parallel to the absorption axis, and each of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer is cut.
• An evaluation sample was prepared by laminating the surface with non-alkali glass [trade name "EAGLE XG", manufactured by Corning Inc.]. This evaluation sample was autoclaved at a temperature of 50 ° C. and a pressure of 5 kgf / cm 2 (490.3 kPa) for 1 hour, and then left to stand in an environment of a temperature of 23 ° C. and a relative humidity of 55% for 24 hours.
• the transmittance was measured (initial value), stored in a heating environment at a temperature of 105 ° C., and the transmittance was measured every 50 hours from 100 to 200 hours. Evaluation was performed according to the following criteria based on the time when the decrease in transmittance reached 5% or more with respect to the initial value. The results obtained are shown in Table 2.

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