CN115516346A - Image display device - Google Patents
Image display device Download PDFInfo
- Publication number
- CN115516346A CN115516346A CN202180033128.6A CN202180033128A CN115516346A CN 115516346 A CN115516346 A CN 115516346A CN 202180033128 A CN202180033128 A CN 202180033128A CN 115516346 A CN115516346 A CN 115516346A
- Authority
- CN
- China
- Prior art keywords
- polarizing film
- adhesive layer
- image display
- film
- monomer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 150000003873 salicylate salts Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
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- 235000007586 terpenes Nutrition 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
-
- 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
- H10K59/87—Passivation; Containers; Encapsulations
- H10K59/871—Self-supporting sealing arrangements
- H10K59/8722—Peripheral sealing arrangements, e.g. adhesives, sealants
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Theoretical Computer Science (AREA)
- Engineering & Computer Science (AREA)
- Nonlinear Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Mathematical Physics (AREA)
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
- Electroluminescent Light Sources (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The invention provides an image display device, which is provided with a front surface transparent component, a polarizing film and an image display unit in sequence through an adhesive layer or an adhesive layer, wherein the change amount of monomer transmissivity is 0-3% and the change amount of monomer hue b value is 0-4 NBS before and after a heat resistance test under the conditions of 105 ℃ and 500 hours on two surfaces of the polarizing film through the adhesive layer or the adhesive layer. The image display device has excellent effects of suppressing the decrease in the monomer transmittance and the increase in the monomer hue b value of the polarizing film in a high-temperature environment.
Description
Technical Field
The present invention relates to an image display device.
Background
Conventionally, as a polarizing film used for various image display devices such as a liquid crystal display device and an organic EL display device, a polyvinyl alcohol-based film subjected to dyeing treatment (containing a dichroic material such as iodine or a dichroic dye) has been used in view of having both high transmittance and high degree of polarization. The polarizing film was produced as follows: the polyvinyl alcohol film is subjected to various treatments such as swelling, dyeing, crosslinking, and stretching in a bath, and then subjected to a cleaning treatment, followed by drying. The polarizing film is generally used in the form of a polarizing film (polarizing plate) in which a protective film such as triacetylcellulose is bonded to one surface or both surfaces thereof with an adhesive.
The polarizing film is used in the form of a laminated polarizing film (optical laminate) by laminating other optical layers as necessary, and the polarizing film or the laminated polarizing film (optical laminate) is used in the form of an image display panel to be bonded to an image display unit such as a liquid crystal cell or an organic EL element, and the image display panel is used in the form of a front surface transparent plate (window layer) on the viewing side or a front surface transparent member such as a touch panel via an adhesive layer or an adhesive layer, to produce the various image display devices described above (patent document 1).
In recent years, such various image display devices have been used as in-vehicle image display devices such as car navigation devices and rear view monitors in addition to mobile devices such as mobile phones and tablet terminals, and their applications have been widened. Accordingly, the polarizing film and the laminated polarizing film are required to have higher durability in a severer environment (for example, a high-temperature environment) than the conventional ones, and polarizing films and image display devices aiming at securing such durability have been proposed (patent documents 2 to 3).
Documents of the prior art
Patent document
Patent document 1: japanese unexamined patent publication No. 2014-102353
Patent document 2: japanese Kokai publication Hei 2012-516468
Patent document 3: japanese patent laid-open publication No. 2018-101117
Disclosure of Invention
Problems to be solved by the invention
In the above-described in-vehicle image display device, the development of the automatic driving technique in recent years has led to the development of a special-shaped and large-sized display design. With such a change in display design, a method for further improving durability in a high-temperature environment has been demanded for a polarizing film.
In view of the above circumstances, an object of the present invention is to provide an image display device having an excellent effect of suppressing a decrease in the monomer transmittance and an increase in the monomer hue b value of a polarizing film in a high-temperature environment.
Means for solving the problems
That is, the present invention relates to an image display device in which a front surface transparent member, a polarizing film, and an image display unit are sequentially provided with an adhesive layer or an adhesive layer interposed therebetween, wherein a change in cell transmittance of a laminate in which glass plates are bonded to both surfaces of the polarizing film with the adhesive layer or the adhesive layer interposed therebetween is 0 to 3% and a change in cell hue b value is 0 to 4NBS before and after a heat resistance test at 105 ℃ for 500 hours.
ADVANTAGEOUS EFFECTS OF INVENTION
The action mechanism of the effect of the image display device of the present invention is not detailed, but is estimated as follows. However, the present invention can be explained without being limited to this mechanism of action.
The image display device of the present invention comprises a front surface transparent member, a polarizing film, and an image display unit, which are sequentially provided with an adhesive layer or an adhesive layer interposed therebetween, wherein the amount of change in the cell transmittance of a laminate in which glass plates are bonded to both surfaces of the polarizing film with the adhesive layer or the adhesive layer interposed therebetween is 0 to 3% and the amount of change in the cell hue b value is 0 to 4NBS, before and after a heat resistance test at 105 ℃ for 500 hours. Since the glass plate corresponds to the front transparent member and the image display unit, the laminate corresponds to the analog image display device. Heretofore, a laminate (analog image display device) having a change in the monomer transmittance of 0 to 3% and a change in the monomer hue b of 0 to 4NBS under the conditions of the above-described heat resistance test has not been known. On the other hand, in order to suppress a decrease in the monomer transmittance of the polarizing film, for example, patent document 1 describes that it is effective to form an image display panel by laminating a polarizing film having an adhesive layer on one surface thereof and an image display unit, and then heat (aging) treat the polarizing film to reduce the moisture content of the polarizing film (hereinafter, also referred to as conventional aging treatment). In the present invention, it was found that moisture contained in the pressure-sensitive adhesive layers or adhesive layers provided on both surfaces of the polarizing film for bonding to the front surface transparent member or the image display unit affects a decrease in the monomer transmittance of the polarizing film and an increase in the monomer hue b value (high-temperature durability) after the heat resistance test of the image display device, and therefore, the pressure-sensitive adhesive layers or adhesive layers for bonding to both surfaces of the polarizing film of the front surface transparent member or the image display unit can be subjected to a heating (aging) treatment to further improve the high-temperature durability of the polarizing film. In addition, in the present invention, by adding a water-soluble radical scavenger to the polarizing film in addition to the above-mentioned conventional aging treatment, the generated radicals can be trapped and the polyterpene can be suppressed even in a high-temperature environment in which the polarizing film is likely to undergo polyterpene, and therefore, the high-temperature durability of the polarizing film can be further improved. In addition, in the present invention, in addition to the above method, the high temperature durability of the polarizing film can be further improved by increasing the potassium concentration of the polarizing film.
Drawings
Fig. 1 is a schematic cross-sectional view showing one embodiment of an image display device.
Fig. 2 is a schematic cross-sectional view showing one mode of a polarizing film.
Description of the symbols
10: polarizing film
11: polarizing film
12 and 13: transparent protective film
20. 30, 40, and 50: adhesive or bonding layers
80: front surface transparent member
90: image display unit
100: image display device
Detailed Description
Fig. 1 is a schematic cross-sectional view showing one embodiment of an image display device according to the present invention. In the image display device 100 of fig. 1, the front surface transparent member 80 is bonded to the polarizing film 10 via the adhesive layer or adhesive layer 20, and the image display unit 90 is bonded to the polarizing film 10 via the adhesive layer or adhesive layer 30.
Fig. 2 is a schematic cross-sectional view showing one embodiment of the polarizing film of the present invention. In the polarizing film 10 of fig. 3, the polarizing film 11 and the transparent protective film 13 are adhered together via an adhesive layer or adhesive layer 50, and the polarizing film 11 and the transparent protective film 12 are adhered together via an adhesive layer or adhesive layer 40.
The image display device of the present invention comprises a front surface transparent member, a polarizing film, and an image display unit, which are sequentially provided with an adhesive layer or an adhesive layer interposed therebetween, wherein the amount of change in the cell transmittance of a laminate in which glass plates are bonded to both surfaces of the polarizing film with the adhesive layer or the adhesive layer interposed therebetween is 0 to 3% and the amount of change in the cell hue b value is 0 to 4NBS, before and after a heat resistance test at 105 ℃ for 500 hours.
< polarizing film >
The polarizing film of the present invention has a polyvinyl alcohol film on which a dichroic material such as iodine or a dichroic dye is adsorbed and oriented. From the viewpoint of initial polarization performance of the polarizing film, an iodine-based polarizing film containing iodine as the above dichroic substance is preferable.
The polyvinyl alcohol (PVA) film may be one having light transmittance in the visible light region and obtained by dispersing and adsorbing a dichroic material such as iodine or a dichroic dye, without any particular limitation. Examples of the material of the polyvinyl alcohol film include polyvinyl alcohol and derivatives thereof. Examples of the derivative of the polyvinyl alcohol include: polyvinyl formal, polyvinyl acetal; olefins such as ethylene and propylene; and derivatives obtained by modification with unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, and alkyl esters thereof, acrylamide, and the like. The average polymerization degree of the polyvinyl alcohol is preferably about 100 to 10000, more preferably about 1000 to 10000, and further preferably about 1500 to 4500. The saponification degree of the polyvinyl alcohol is preferably about 80 to 100 mol%, more preferably about 95 to 99.95 mol%. The average polymerization degree and the saponification degree can be determined according to JIS K6726.
The polarizing film may contain a water-soluble radical scavenger from the viewpoint of suppressing a decrease in the monomer transmittance and an increase in the monomer hue b value of the polarizing film in a high-temperature environment. From the viewpoint of easy migration to the moisture in the polarizing film, the water-soluble radical scavenger is preferably a compound that can dissolve 1 part by weight or more in 100 parts by weight of 25 ℃ water, more preferably a compound that can dissolve 2 parts by weight or more in 100 parts by weight of 25 ℃ water, and even more preferably a compound that can dissolve 5 parts by weight or more in 100 parts by weight of 25 ℃ water. The water-soluble radical scavenger may be used alone or in combination of two or more.
It is presumed that the water-soluble radical scavenger can suppress polyene formation in the polarizing film in a high-temperature environment. Examples of the water-soluble radical scavenger include: hindered phenol compounds, hindered amine compounds, phosphorus compounds, sulfur compounds, benzotriazole compounds, benzophenone compounds, hydroxylamine compounds, salicylate compounds, triazine compounds, and the like, which have a radical trapping function. The water-soluble radical scavenger is preferably a compound having, for example, a nitroxyl radical or a nitroxyl group from the viewpoint of the kind of radical generated in the polarizing film.
Examples of the compound having a nitroxyl radical or nitroxyl group include N-oxyl compounds (having C-N (-C) -O) from the viewpoint of having a relatively stable radical at room temperature in air · Compound (O) as a functional group · Oxygen radical)), a known compound can be used. Examples of the N-oxyl compound include compounds having an organic group having the following structure.
[ chemical formula 1]
(in the general formula (1), R 1 Represents an oxygen radical, R 2 ～R 5 Independently represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, and n represents 0 or 1), and the left side of the dotted line portion in the general formula (1) represents an arbitrary organic group.
Examples of the compound having an organic group include compounds represented by the following general formulae (2) to (5).
[ chemical formula 2]
(in the general formula (2), R 1 ～R 5 And n is as defined above, R 6 Represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an acyl group or an aryl group, and n represents 0 or 1. )
[ chemical formula 3]
(in the general formula (3), R 1 ～R 5 And n is as defined above, R 7 And R 8 Independently represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an acyl group or an aryl group. )
[ chemical formula 4]
(in the general formula (4), R 1 ～R 5 And n is as defined above, R 9 ～R 11 Independently represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an acyl group, an amino group, an alkoxy group, a hydroxyl group, or an aryl group. )
[ chemical formula 5]
(in the general formula (5), R 1 ～R 5 And n is as defined above, R 12 Represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an amino group, an alkoxy group, a hydroxyl group, or an aryl group. )
In the above general formulae (1) to (5), R is R from the viewpoint of easy availability 2 ～R 5 Preferably an alkyl group having 1 to 6 carbon atoms, and more preferably an alkyl group having 1 to 3 carbon atoms. In the general formula (2), R is R from the viewpoint of easy acquisition 6 Preferably a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, and more preferably a hydrogen atom. In the general formula (3), R is preferably R from the viewpoint of easy acquisition 7 And R 8 Independently a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, more preferably a hydrogen atom. In the general formula (4), R is R from the viewpoint of easy acquisition 9 ～R 11 Preferably a hydrogen atom or an alkyl group having 1 to 10 carbon atoms. In the general formula (5), R is R from the viewpoint of easy acquisition 12 Preferably hydroxyl, amino or alkoxy. In the general formulae (1) to (5), n is preferably 1 from the viewpoint of easy acquisition.
Examples of the N-oxyl compound include: n-oxyl compounds described in, for example, japanese patent application laid-open Nos. 2003-64022, 11-222462, 2002-284737 and 2016/047655.
Examples of the compound having a nitroxyl radical or a nitroxyl group include the following compounds.
[ chemical formula 6]
(in the general formula (6), R represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an acyl group or an aryl group.)
[ chemical formula 7]
[ chemical formula 8]
The molecular weight of the water-soluble radical scavenger is preferably 1000 or less, more preferably 500 or less, and still more preferably 300 or less, from the viewpoint of efficiently trapping radicals generated in the polarizing film.
In the case where the polarizing film contains the water-soluble radical scavenger, the content of the water-soluble radical scavenger is preferably 0.005 wt% or more, more preferably 0.01 wt% or more, further preferably 0.1 wt% or more, and is preferably 15 wt% or less, more preferably 12 wt% or less, further preferably 10 wt% or less, and further preferably 5 wt% or less, from the viewpoint of suppressing a decrease in the monomer transmittance and an increase in the monomer hue b value of the polarizing film in a high-temperature environment.
In addition, the polarizing film can increase the potassium concentration from the viewpoint of suppressing the decrease in the monomer transmittance and the increase in the monomer hue b value of the polarizing film in a high-temperature environment. When the potassium concentration of the polarizing film is increased, the potassium concentration is preferably 0.3 wt% or more, more preferably 0.35 wt% or more, and still more preferably 0.4 wt% or more, and from the viewpoint of suppressing a change in reflection hue in a high-temperature environment, the potassium concentration is preferably 0.8 wt% or less, and more preferably 0.6 wt% or less in the polarizing film.
The polarizing film is obtained by a conventional method for producing a polarizing film, and for example, the polyvinyl alcohol-based film is subjected to at least a dyeing step, a crosslinking step, and a stretching step, while being subjected to an optional swelling step and a washing step. In the case where the polarizing film contains the water-soluble radical scavenger, the treatment bath in any one or more of the swelling step, the washing step, the dyeing step, the crosslinking step, and the stretching step may contain a water-soluble radical scavenger. In addition, when the potassium concentration of the polarizing film is increased, the potassium concentration of the polarizing film may be increased by adjusting the concentration of a potassium component-providing substance such as potassium halide, for example, potassium iodide, contained in any one or more of the swelling step, the washing step, the dyeing step, the crosslinking step, and the stretching step, and the treatment temperature and treatment time of each treatment bath.
The thickness of the polarizing film is preferably 1 μm or more, more preferably 2 μm or more from the viewpoint of improving the initial degree of polarization of the polarizing film, and is preferably 20 μm or less, more preferably 15 μm or less, further preferably 10 μm or less, and further preferably 8 μm or less from the viewpoint of preventing warping of the panel. In particular, in order to obtain a polarizing film having a thickness of about 8 μm or less, a thin polarizing film production method using a laminate comprising a thermoplastic resin substrate and a polyvinyl alcohol resin layer formed on the thermoplastic resin substrate as the polyvinyl alcohol film can be applied.
The polarizing film (thin polarizing film) is obtained by a conventional method for producing a polarizing film, and is obtained by, for example, performing the following steps: a step of forming a polyvinyl alcohol resin layer (PVA-based resin layer) containing a polyvinyl alcohol resin (PVA-based resin) on one side of a long thermoplastic resin base material to prepare a laminate; the laminate is subjected to an optional insolubilization treatment step, crosslinking treatment step, and washing treatment step while being conveyed in the longitudinal direction, and is subjected to at least an auxiliary stretching treatment step in a gas atmosphere, a dyeing treatment step, and an in-aqueous solution stretching treatment step. In the case where the polarizing film contains the water-soluble radical scavenger, the treatment bath in at least one of the insolubilization treatment step, the crosslinking treatment step, the washing treatment step, the dyeing treatment step, and the stretching treatment step in the aqueous solution may contain the water-soluble radical scavenger. In addition, when the potassium concentration of the polarizing film is increased, the potassium concentration of the polarizing film may be increased by adjusting the concentration of a potassium component-providing substance such as potassium halide, for example, potassium iodide, contained in the treatment bath in at least one of the insolubilization treatment step, the crosslinking treatment step, the washing treatment step, the dyeing treatment step, and the stretching treatment step in the aqueous solution, and the treatment temperature and the treatment time of each treatment bath.
The polarizing film is generally bonded with a transparent protective film on at least one surface thereof via an adhesive layer or an adhesive layer.
< adhesive layer >
As the adhesive for forming the adhesive layer, various adhesives used for a polarizing film can be applied, and examples thereof include: rubber-based adhesives, acrylic-based adhesives, silicone-based adhesives, urethane-based adhesives, vinyl alkyl ether-based adhesives, polyvinyl alcohol-based adhesives, polyvinyl pyrrolidone-based adhesives, polyacrylamide-based adhesives, cellulose-based adhesives, and the like. Among these, acrylic adhesives are preferred. The acrylic adhesive contains an acrylic polymer as a base polymer, and examples thereof include: an acrylic pressure-sensitive adhesive described in Japanese patent application laid-open No. 2017-75998 and the like.
The acrylic polymer in the acrylic pressure-sensitive adhesive has a main skeleton of a monomer unit of an alkyl (meth) acrylate. As the alkyl (meth) acrylate, an alkyl (meth) acrylate in which the alkyl group has 1 to 20 carbon atoms can be suitably used, and the content of the alkyl (meth) acrylate is preferably 40% by weight or more, more preferably 60% by weight or more, based on the total amount of monomer components constituting the base polymer. In addition, from the viewpoint of adjusting the adhesiveness of the adhesive, a monomer unit such as a nitrogen-containing monomer unit or a hydroxyl group-containing monomer may be contained. In addition, a crosslinking agent may be used for forming a crosslinked structure in the pressure-sensitive adhesive layer, and examples of the crosslinking agent include isocyanate-based crosslinking agents, epoxy-based crosslinking agents, and the like,
Crosslinking agents generally used include oxazoline crosslinking agents, aziridine crosslinking agents, carbodiimide crosslinking agents, metal chelate crosslinking agents, and the like. The amount of the crosslinking agent used is usually 10 parts by weight or less, preferably 5 parts by weight or less, relative to 100 parts by weight of the base polymer.
From the viewpoint of adjusting the adhesion force, a silane coupling agent may be added to the binder; terpene-based tackifiers, styrene-based tackifiers, phenol-based tackifiers, rosin-based tackifiers, epoxy-based tackifiers, and the like. In addition, an ultraviolet absorber may be added from the viewpoint of improvement of light resistance. In addition to the components exemplified above, additives such as a plasticizer, a softening agent, a deterioration preventing agent, a filler, a colorant, an antioxidant, a surfactant, and an antistatic agent may be used in the adhesive within a range that does not impair the characteristics of the adhesive.
As a method of forming the adhesive layer, for example: a method in which the adhesive is applied to a separator or the like subjected to a peeling treatment, dried to form an adhesive layer, and then transferred to a polarizing film or the like; or a method in which the adhesive is applied to a polarizing film or the like and dried to form an adhesive layer. The thickness of the pressure-sensitive adhesive layer is not particularly limited, and is, for example, about 1 to 100 μm, preferably about 2 to 50 μm.
< adhesive layer >
As the adhesive forming the adhesive layer, various adhesives used for a polarizing film can be applied, and examples thereof include: isocyanate adhesives, polyvinyl alcohol adhesives, gelatin adhesives, vinyl latexes, water-based polyesters, and the like. These adhesives are generally used in the form of an adhesive (aqueous adhesive) formed from an aqueous solution, and contain 0.5 to 60 wt% of a solid content. Among these, polyvinyl alcohol adhesives are preferred, and acetoacetyl group-containing polyvinyl alcohol adhesives are more preferred.
The aqueous adhesive may contain a crosslinking agent. As the crosslinking agent, a compound having at least 2 functional groups reactive with components such as a polymer constituting the adhesive in 1 molecule can be usually used, and examples thereof include: alkylene diamines; isocyanates; epoxy resin; aldehydes; amino-formaldehydes such as methylolurea and methylolmelamine. The amount of the crosslinking agent in the adhesive is usually about 10 to 60 parts by weight per 100 parts by weight of the components such as the polymer constituting the adhesive.
Examples of the adhesive include active energy ray-curable adhesives such as ultraviolet-curable adhesives and electron beam-curable adhesives other than the above adhesives. Examples of the active energy ray-curable adhesive include (meth) acrylate adhesives. Examples of the curable component in the (meth) acrylate adhesive include: a compound having a (meth) acryloyl group, a compound having a vinyl group. Examples of the compound having a (meth) acryloyl group include: alkyl (meth) acrylates such as chain alkyl (meth) acrylates having 1 to 20 carbon atoms, alicyclic alkyl (meth) acrylates, and polycyclic alkyl (meth) acrylates; a hydroxyl group-containing (meth) acrylate; epoxy group-containing (meth) acrylates such as glycidyl (meth) acrylate, and the like. The (meth) acrylate-based adhesive may comprise hydroxyethyl (meth) acrylamide, N-hydroxymethyl (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-ethoxymethylNitrogen-containing monomers such as methylol (meth) acrylamide, and (meth) acryloylmorpholine. The (meth) acrylic adhesive may contain tripropylene glycol diacrylate, 1, 9-nonanediol diacrylate, tricyclodecane dimethanol diacrylate, cyclic trimethylolpropane formal acrylate, and ditrimethylolpropane formal acrylate
A polyfunctional monomer such as alkylene glycol diacrylate or EO-modified diglycerol tetraacrylate as a crosslinking component. Further, as the cationic polymerization curing adhesive, a compound having an epoxy group or an oxetane group may be used. The compound having an epoxy group is not particularly limited as long as it has at least 2 epoxy groups in the molecule, and various curable epoxy compounds generally known can be used.
The adhesive may contain a suitable additive as needed. Examples of the additives include: silane coupling agents, coupling agents such as titanium coupling agents, bonding accelerators such as ethylene oxide, ultraviolet absorbers, deterioration prevention agents, dyes, processing aids, ion trapping agents, antioxidants, tackifiers, fillers, plasticizers, leveling agents, foaming inhibitors, antistatic agents, heat-resistant stabilizers, hydrolysis-resistant stabilizers and the like.
The adhesive may be applied to either or both of the transparent protective film side (or the functional layer side) described later and the polarizing film side described later. After the bonding, a drying step is performed to form an adhesive layer formed by applying a dry layer. After the drying step, ultraviolet rays or electron beams may be irradiated, if necessary. The thickness of the adhesive layer is not particularly limited, and is preferably about 30 to 5000nm, more preferably about 100 to 1000nm in the case of using an aqueous adhesive or the like, and is preferably about 0.1 to 100 μm, more preferably about 0.5 to 10 μm in the case of using an ultraviolet-curable adhesive, an electron beam-curable adhesive or the like.
< transparent protective film >
The transparent protective film is not particularly limited, and various transparent protective films used for polarizing films can be used. As a material constituting the transparent protective film, for example, a thermoplastic resin excellent in transparency, mechanical strength, thermal stability, moisture barrier property, isotropy, and the like can be used. Examples of the thermoplastic resin include: cellulose ester resins such as cellulose triacetate, polyester resins such as polyethylene terephthalate and polyethylene naphthalate, polyethersulfone resins, polysulfone resins, polycarbonate resins, polyamide resins such as nylon and aromatic polyamide, polyimide resins, polyolefin resins such as polyethylene, polypropylene and ethylene-propylene copolymers, (meth) acrylic resins, cyclic polyolefin resins having a cyclic or norbornene structure (norbornene resins), polyarylate resins, polystyrene resins, polyvinyl alcohol resins, and mixtures thereof. The transparent protective film may be a cured layer formed of a thermosetting resin or an ultraviolet-curable resin such as a (meth) acrylic resin, a urethane resin, an acrylic urethane resin, an epoxy resin, or a silicone resin. Among these, cellulose ester resins, polycarbonate resins, (meth) acrylic resins, cyclic polyolefin resins, and polyester resins are preferable.
The thickness of the transparent protective film may be suitably determined, and is generally preferably about 1 to 500 μm, more preferably about 1 to 300 μm, and still more preferably about 5 to 100 μm from the viewpoints of strength, handling properties such as handling properties, and thin layer properties.
When the transparent protective films are bonded to both surfaces of the polarizing film, the transparent protective films may be the same or different.
The transparent protective film may be a retardation plate having a front retardation of 40nm or more and/or a thickness direction retardation of 80nm or more. The front retardation is usually controlled to be in the range of 40 to 200nm, and the thickness direction retardation is usually controlled to be in the range of 80 to 300 nm. When a retardation plate is used as the transparent protective film, the retardation plate also functions as a transparent protective film, and therefore, the thickness can be reduced.
Examples of the phase difference plate include: birefringent films obtained by uniaxially or biaxially stretching a polymer material, oriented films of liquid crystal polymers, and retardation plates obtained by supporting oriented layers of liquid crystal polymers with films. The thickness of the retardation plate is not particularly limited, and is usually about 20 to 150 μm. The retardation plate can be used by laminating the retardation plate on a transparent protective film having no retardation.
The transparent protective film may contain any suitable additive such as an ultraviolet absorber, an antioxidant, a lubricant, a plasticizer, a mold release agent, a coloring inhibitor, a flame retardant, an antistatic agent, a pigment, and a colorant. In particular, when the transparent protective film contains an ultraviolet absorber, the light resistance of the polarizing film can be improved.
When the transparent protective film is bonded to the visible side of the polarizing film, the moisture permeability is preferably 600 g/(m) from the viewpoint of durability of the polarizing film under high temperature and high humidity conditions 2 24 h) or less, more preferably 400 g/(m) 2 24 h) or less. In the case where the transparent protective film is bonded to the image display unit side of the polarizing film, the moisture permeability is preferably 50 g/(m) from the viewpoint of production efficiency in the drying step after bonding 2 24 h) or more, more preferably 100 g/(m) 2 24 h) or more, and the moisture permeability is preferably 1000 g/(m) 2 24 h) or less, more preferably 600 g/(m) 2 24 h) or less. Note that the moisture permeability can be calculated as follows: according to the moisture permeability test (cup method) of JIS Z0208, a sample cut into 60mm in diameter was placed in a moisture permeable cup containing about 15g of calcium chloride, and the cup was placed in a thermostatic apparatus at a temperature of 40 ℃ and a humidity of 90% by volume R.H., and the weight increase of calcium chloride before and after 24 hours of standing was measured to calculate the weight increase.
A functional layer such as a hard coat layer, an antireflection layer, an adhesion prevention layer, a diffusion layer, or an antiglare layer may be provided on the surface of the transparent protective film that is not bonded to the polarizing film. The functional layers such as the hard coat layer, the antireflection layer, the adhesion prevention layer, the diffusion layer, and the antiglare layer may be provided as a protective film itself or as a layer different from the protective film.
The polarizing film and the transparent protective film, or the polarizing film and the functional layer are generally bonded together through the adhesive layer or the adhesive layer.
The transparent protective film and the polarizing film, or the polarizing film and the functional layer may be laminated with a surface modification layer, an easy-adhesion layer, a barrier layer, a refractive index adjustment layer, or the like interposed therebetween.
Examples of the surface modification treatment for forming the surface modification layer include: corona treatment, plasma treatment, undercoating treatment, saponification treatment, and the like.
Examples of the easy adhesive agent for forming the easy adhesive layer include: the material for forming the resin composition includes various resins having a polyester skeleton, a polyether skeleton, a polycarbonate skeleton, a polyurethane skeleton, silicones, a polyamide skeleton, a polyimide skeleton, a polyvinyl alcohol skeleton, and the like. The easy-adhesion layer may be provided in advance on a protective film, and the easy-adhesion layer side of the protective film may be laminated on the polarizing film with the adhesive layer or the adhesive layer interposed therebetween.
The barrier layer is a layer having a function of preventing impurities such as oligomers and ions dissolved from the transparent protective film from moving (entering) into the polarizing film. The barrier layer may be any layer that has transparency and can prevent impurities from dissolving out of a transparent protective film or the like, and examples of materials for forming the barrier layer include: urethane prepolymer-based forming materials, cyanoacrylate-based forming materials, epoxy-based forming materials, and the like.
The refractive index adjustment layer is provided to suppress a decrease in transmittance due to reflection between the transparent protective film and the polarizing film or other layers having different refractive indices. Examples of the refractive index adjusting material for forming the refractive index adjusting layer include: the material for forming the resin composition contains various resins including silica-based resins, acrylic-styrene resins, melamine resins, and the like, and additives.
In addition, the polarizing film may have an optical layer bonded to at least one surface of the polarizing film with the pressure-sensitive adhesive layer or the adhesive layer interposed therebetween.
The optical layer is not particularly limited, and optical layers used in the formation of liquid crystal display devices and the like may be used, for example, 1 or 2 or more layers of reflective plates, semi-transmissive plates, retardation plates (including 1/2, 1/4, and the like wave plates), viewing angle compensation films, and the like. Examples of the polarizing film include a reflective polarizing film or a semi-transmissive polarizing film in which a reflective plate or a semi-transmissive reflective plate is further laminated on the polarizing film, an elliptical polarizing film or a circular polarizing film in which a phase difference plate is further laminated on the polarizing film, a wide-angle polarizing film in which a viewing angle compensation film is further laminated on the polarizing film, and a polarizing film in which a brightness enhancement film is further laminated on the polarizing film.
The pressure-sensitive adhesive layer or the adhesive layer may be provided in advance on one surface or both surfaces of the polarizing film in order to bond an image display unit such as a liquid crystal cell or an organic EL element, and another member such as a front-surface transparent plate on the viewing side or a front-surface transparent member such as a touch panel.
The exposed surface of the pressure-sensitive adhesive layer or the adhesive layer is preferably covered by a temporary adhesive film for the purpose of preventing contamination or the like until the pressure-sensitive adhesive layer or the adhesive layer is actually used. This can prevent the adhesive layer or the adhesive layer from being contaminated in a normal handling state. As the separator, for example, a separator obtained by coating an appropriate thin layer body such as a plastic film, a rubber sheet, paper, cloth, nonwoven fabric, net, foamed sheet, metal foil, or a laminate thereof with an appropriate release agent such as silicone, long-chain alkyl, fluorine, or molybdenum sulfide, as necessary, can be used.
< front surface transparent Member >
The front surface transparent member of the present invention is a front surface transparent member disposed on the visible side of the image display unit. Examples of the front surface transparent member include: a front surface transparent plate (window layer), a touch panel, and the like. As the front surface transparent plate, a front surface transparent plate having appropriate mechanical strength and thickness can be used. As such a transparent plate, for example, a transparent resin plate such as an acrylic resin or a polycarbonate resin, a glass plate, or the like can be used. As the touch panel, for example, various touch panels of a resistive film type, a capacitive type, an optical type, an ultrasonic type, and the like, a glass plate having a touch sensor function, a transparent resin plate, and the like can be used. In the case of using a capacitance type touch panel as the front surface transparent member, a front surface transparent plate made of glass or a transparent resin plate is preferably provided on the visible side of the touch panel.
< image display Unit >
Examples of the image display unit of the present invention include: liquid crystal cells, organic EL cells, and the like. As the liquid crystal cell, any of a reflective liquid crystal cell using external light, a transmissive liquid crystal cell using light from a light source such as a backlight, and a transflective liquid crystal cell using both light from the outside and light from the light source can be used, for example. In the case where the liquid crystal cell uses light from a light source, the image display device (liquid crystal display device) is also provided with a polarizing film on the side opposite to the viewing side of the image display cell (liquid crystal cell) and a light source. The polarizing film on the light source side and the liquid crystal cell are preferably bonded together with an appropriate adhesive layer interposed therebetween. As a driving method of the liquid crystal cell, for example: VA mode, IPS mode, TN mode, STN mode, bend (bend) orientation (pi-type), and the like.
As the organic EL unit, for example, an organic EL unit in which a transparent electrode, an organic light-emitting layer, and a metal electrode are sequentially stacked on a transparent substrate to form a light-emitting body (organic electroluminescent light-emitting body) can be suitably used. The organic light-emitting layer is a laminate of various organic thin films, and various layer structures including, for example: a laminate of a hole injection layer formed of a triphenylamine derivative or the like and a light-emitting layer formed of a fluorescent organic solid such as anthracene, a laminate of these light-emitting layers and an electron injection layer formed of a perylene derivative or the like, a laminate of a hole injection layer, a light-emitting layer, and an electron injection layer, or the like.
In forming the image display device, after the image display unit is bonded to the polarizing film to form the image display panel and before the image display unit is bonded to the front transparent member, the image display panel may be subjected to a heating (aging) treatment in order to suppress a decrease in the monomer transmittance of the polarizing film and an increase in the monomer hue b value in a high-temperature environment. In this case, the pressure-sensitive adhesive layer or the adhesive layer for bonding to both surfaces of the front transparent member and the polarizing film of the image display unit is subjected to a heating (aging) treatment, whereby the decrease in the monomer transmittance and the increase in the monomer hue b value in a high-temperature environment can be further suppressed. The heating conditions in the heating (aging) treatment are not particularly limited as long as the moisture contained in the adhesive layer or the adhesive layer provided on both surfaces of the polarizing film and the polarizing film can be sufficiently reduced, and the heating temperature is, for example, preferably about 70 to 90 ℃, more preferably about 75 to 85 ℃. The heating time is preferably about 30 minutes to 5 hours, and more preferably about 1 hour to 3 hours. In addition, when heat (aging) treatment is performed in a state where the pressure-sensitive adhesive layer or the adhesive layer is attached to both surfaces of the polarizing film, it is effective that the moisture permeability of the pressure-sensitive adhesive layer or the adhesive layer is high, and when heat (aging) treatment is performed in a state where the pressure-sensitive adhesive layer or the adhesive layer is attached to one surface, it is effective that the moisture content of the pressure-sensitive adhesive layer or the adhesive layer (the pressure-sensitive adhesive layer or the adhesive layer on the other surface) stacked from the rear is low. In the case of forming the image display device, the image display unit may be bonded by applying the heat (aging) treatment after the front transparent member is bonded to the polarizing film.
Examples
The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.
< example 1 >
< preparation of polarizing film >
A polyvinyl alcohol film having an average degree of polymerization of 2400, a degree of saponification of 99.9 mol% and a thickness of 45 μm was prepared. The polyvinyl alcohol film was immersed between rolls having different peripheral speed ratios for 30 seconds between them in a swelling bath (water bath) at 30 ℃ to swell the film and stretched 2.2 times in the transport direction (swelling step), and then immersed for 30 seconds in a dyeing bath at 30 ℃ (an aqueous iodine solution prepared by blending iodine and potassium iodide at a weight ratio of 1. Next, the dyed polyvinyl alcohol film was immersed in a crosslinking bath (aqueous solution having a boric acid concentration of 3.5 wt%, a potassium iodide concentration of 3.0 wt%, and a zinc sulfate concentration of 3.6 wt%) at 40 ℃ for 28 seconds, and the original polyvinyl alcohol film was stretched 3.6 times in the transport direction (crosslinking step). Further, the obtained polyvinyl alcohol film was immersed in a stretching bath (an aqueous solution having a boric acid concentration of 4.5 wt%, a potassium iodide concentration of 5.0 wt%, and a zinc sulfate concentration of 5.0 wt%) at 64 ℃ for 60 seconds, stretched 6.0 times in the transport direction based on the original polyvinyl alcohol film (stretching step), and then immersed in a cleaning bath (an aqueous solution having a potassium iodide concentration of 2.3 wt%, and a compound represented by the following general formula (9) as a water-soluble radical scavenger having a concentration of 1.0 wt%) at 27 ℃ for 10 seconds (cleaning step). The washed polyvinyl alcohol film was dried at 40 ℃ for 30 seconds to prepare a polarizing film. The potassium content of the polarizing film was 0.31% by weight, the content of the compound represented by the following general formula (9) was 0.3% by weight, and the thickness of the polarizing film was 18 μm.
[ chemical formula 9]
< method for measuring Potassium content (% by weight) in polarizing film >
The polarizing film was measured for the fluorescent X-ray intensity (kcps) of potassium element using a fluorescent X-ray analyzer (trade name "ZSX100E" manufactured by Ikegaku corporation, measurement diameter:. Psi.10 mm). On the other hand, the thickness (. Mu.m) of the polarizing film was measured using a spectroscopic thickness meter (product name "DG-205" manufactured by PEACOCK). The potassium content (% by weight) was determined from the obtained fluorescent X-ray intensity and thickness by the following equation. The following "2.99" is a coefficient of a calibration curve derived by measuring the fluorescent X-ray intensity (kcps) of a sample (for example, a PVA-based resin film to which a certain amount of KI is added) whose thickness (μm) and potassium concentration (wt%) are known.
Potassium content in the polarizing film (% by weight) =2.99 × (fluorescent X-ray intensity of potassium element)/(thickness of polarizing film)
< method for measuring content (wt%) of water-soluble radical scavenger in polarizing film >
About 20mg of the polarizing film was quantitatively determined, and the polarizing film was dissolved in 1mL of water under heating, and then diluted with 4.5mL of methanol, and the resulting extract was filtered through a membrane filter, and the concentration of the water-soluble radical scavenger was measured by HPLC (ACQUITY UPLC H-class Bio, manufactured by Waters).
< production of polarizing film >
As the adhesive, an aqueous solution containing a polyvinyl alcohol resin having an acetoacetyl group (average polymerization degree of 1200, saponification degree of 98.5 mol%, acetoacetylation degree of 5 mol%) and methylolmelamine at a weight ratio of 3. A transparent protective film (made of a Japanese catalyst and having a moisture permeability of 125 g/(m) was laminated on one surface (image display unit side) of the polarizing film obtained above using the adhesive and a roll laminator, and the transparent protective film was 30 μm thick and was formed from a (meth) acrylic resin (a modified acrylic polymer having a lactone ring structure) 2 24 h)), and the other surface (visible side) was bonded to a 48 μm thick transparent protective film (moisture permeability 300 g/(m) with HC formed on a triacetyl cellulose film (fuji film, trade name "TJ40 UL") (moisture permeability 300 g/(m) with HC formed thereon) 2 24 hours)), and then dried by heating in an oven (temperature 90 ℃ for 10 minutes), a polarizing film was produced in which transparent protective films were laminated on both sides of the polarizing film.
< preparation of acrylic adhesive >
A monomer mixture containing 99 parts of butyl acrylate and 1 part of 4-hydroxybutyl acrylate was placed in a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen inlet tube, and a condenser. Further, 0.1 part of 2,2' -azobisisobutyronitrile as a polymerization initiator was added together with 100 parts of ethyl acetate to 100 parts of the monomer mixture (solid content), nitrogen gas was introduced while slowly stirring, and after nitrogen substitution, the liquid temperature in the flask was kept near 55 ℃ to conduct polymerization for 8 hours, thereby preparing a solution of an acrylic polymer having a weight average molecular weight (Mw) of 180 ten thousand. Then, 0.02 part of an isocyanate crosslinking agent (trade name "Takenate D110N" manufactured by Tosoh corporation, trimethylolpropane/xylylene diisocyanate adduct) and 0.2 part of a silane coupling agent (trade name "X-41-1056" manufactured by shin-Etsu chemical Co., ltd.) were mixed with 100 parts of the solid content of the obtained acrylic polymer solution to prepare a solution of an acrylic pressure-sensitive adhesive composition.
< production of polarizing film with adhesive layer >
The acrylic pressure-sensitive adhesive composition solution obtained above was applied to one surface of a polyethylene terephthalate film (mitsubishi chemical polyester film product, trade name "MRF38", separator) treated with a silicone-based release agent so that the thickness of the pressure-sensitive adhesive layer after drying became 20 μm, and the pressure-sensitive adhesive layer was formed on the surface of the separator by drying at 90 ℃ for 1 minute. Next, the pressure-sensitive adhesive layer formed on the separator was transferred to the protective film surface on the image display cell side of the polarizing film thus produced, thereby producing a polarizing film with a pressure-sensitive adhesive layer.
< production of analog image display device (laminate) >
The polarizing film with the pressure-sensitive adhesive layer obtained above was cut into a size of 150 × 45mm so that the absorption axis of the polarizing film was parallel to the long side, and a glass plate (EG-XG, 165 × 50mm, thickness 0.7mm, manufactured by mitsubishi corporation) was laminated with the pressure-sensitive adhesive layer interposed therebetween, and autoclave treatment was performed at 50 ℃ and 0.5MPa for 15 minutes to prepare a pseudo image display panel (a laminate of polarizing films having a single-sided pressure-sensitive adhesive layer). Then, the simulation image display panel was left to stand in a hot air oven at 80 ℃ for 2 hours to be aged, and then, was taken out of the oven and left to stand in an environment of 23 ℃ and 55% for 1 hour. Then, another glass panel was bonded to the surface of the protective film on the visible side with an acrylic-free monomer adhesive (trade name LUCIACS CS98210, manufactured by NITTON ELECTRIC CORPORATION) having a thickness of 200 μm interposed therebetween, and autoclave treatment was performed at 50 ℃ and 0.5MPa for 15 minutes to prepare an analog image display device (laminate).
< evaluation of durability in high temperature Environment >
The analog image display device (laminate) obtained above was left to stand in a hot air oven at a temperature of 105 ℃ for 500 hours, and the monomer transmittance (Δ Ts) and the monomer hue b value (Δ b) before and after the input (heating) were measured. The monomer transmittance and the monomer hue b value were measured using a spectrophotometer (available from Otsuka electronics Co., ltd., LPF-200). The single transmittance is a Y value obtained by correcting visibility with a 2-degree field of view (C light source) of JlS Z8701-1982. The measurement wavelength was 380 to 780nm (5 nm interval).
ΔTs(％)＝Ts 500 －Ts 0
Δb(NBS)＝b 500 －b 0
Wherein, ts 0 And b 0 Is the initial (pre-heating) monomer transmittance and monomer hue b value, ts 500 And b 500 The transmittance of the monomer and the b value of the monomer hue after heating for 500 hours. Δ Ts (%) is preferably 0% or more and 3% or less, more preferably 0% or more and 2% or less. Δ b (NBS) is preferably 0NBS or more and 4NBS or less, more preferably 0NBS or more and 3NBS or less. The results are shown in Table 1.
< example 2 >
A polarizing film, and a pseudo-image display device (laminate) were produced in the same manner as in example 1, except that the compound represented by the general formula (9) was not added to a cleaning bath, the potassium iodide concentration was adjusted to 3.6 wt%, and an acrylic-free monomer adhesive having a thickness of 200 μm was laminated on the visible-side protective film surface before being put into a hot air oven at 80 ℃ in the production of the pseudo-image display device, thereby producing a pseudo-image display panel (laminate of polarizing films having adhesive layers on both sides).
< comparative example 1 >
A polarizing film, and a pseudo-image display device (laminate) were produced in the same manner as in example 1, except that the compound represented by the general formula (9) was not added to a cleaning bath to adjust the potassium iodide concentration to 3.6 wt%, and that the pseudo-image display panel was not allowed to stand in a hot air oven at 80 ℃ for 2 hours to be subjected to aging treatment in the production of the pseudo-image display device.
< comparative example 2 >
A polarizing film, and a pseudo-image display device (laminate) were produced in the same manner as in example 1, except that the compound represented by the general formula (9) was not added to the cleaning bath in the production of the polarizing film.
< comparative example 3 >
A polarizing film, and a pseudo-image display device (laminate) were produced in the same manner as in example 1, except that the pseudo-image display panel was not left to stand in a hot air oven at 80 ℃ for 2 hours and subjected to an aging treatment in the production of the pseudo-image display device.
< comparative example 4 >
A polarizing film, and a pseudo-image display device (laminate) were produced in the same manner as in example 1, except that a polyvinyl alcohol film having a thickness of 75 μm was used, a compound represented by general formula (9) was not added to the cleaning bath, the potassium iodide concentration was adjusted to 4.0 wt%, and the film was allowed to stand in a hot air oven at 90 ℃ for 5 hours in the production of the pseudo-image display device. The thickness of the polarizing film was 28 μm.
The above-described evaluation of durability in a high-temperature environment was carried out using the simulated image display devices (laminates) of the examples and comparative examples obtained above. The results are shown in Table 1.
Claims (3)
1. An image display device comprising a front surface transparent member, a polarizing film, and an image display unit arranged in this order with an adhesive layer or an adhesive layer interposed therebetween,
the amount of change in the monomer transmittance of a laminate in which glass plates are bonded to both surfaces of the polarizing film via the pressure-sensitive adhesive layer or the adhesive layer is 0 to 3% and the amount of change in the monomer hue b value is 0 to 4NBS before and after a heat resistance test at 105 ℃ for 500 hours.
2. The image display apparatus according to claim 1,
and a transparent protective film is bonded to at least one surface of the polarizing film with the adhesive layer or the adhesive layer interposed therebetween.
3. The image display apparatus according to claim 1 or 2,
and an optical layer is bonded to at least one surface of the polarizing film with the pressure-sensitive adhesive layer or the adhesive layer interposed therebetween.
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| JP2020082370 | 2020-05-08 | ||
| JP2020-082370 | 2020-05-08 | ||
| PCT/JP2021/017181 WO2021225114A1 (en) | 2020-05-08 | 2021-04-30 | Image display device |
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| CN115516346A true CN115516346A (en) | 2022-12-23 |
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| KR (1) | KR20230007310A (en) |
| CN (1) | CN115516346A (en) |
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| JP7499743B2 (en) * | 2021-10-19 | 2024-06-14 | 日東電工株式会社 | Polarizing plate, polarizing plate with adhesive, and image display device |
| JP2024008691A (en) * | 2022-07-08 | 2024-01-19 | 日東電工株式会社 | Protective sheet |
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| US20120236408A1 (en) | 2009-01-30 | 2012-09-20 | Ki-Ok Kwon | Outstandingly durable and heat-resistant polarising element, polarising plate and image-display device, and polarising-element production method |
| JP6071459B2 (en) | 2012-11-19 | 2017-02-01 | 日東電工株式会社 | Polarizing plate, image display device, and manufacturing method thereof |
| KR101678275B1 (en) * | 2013-09-30 | 2016-11-21 | 주식회사 엘지화학 | Method for preparing polarizing plate near natural black color and polarizing plate prepared thereby |
| JP6850601B2 (en) | 2016-12-21 | 2021-03-31 | 日東電工株式会社 | Image display device |
| JP6914356B2 (en) * | 2017-11-24 | 2021-08-04 | 日東電工株式会社 | Polarizer manufacturing method |
| CN111373295B (en) * | 2017-11-24 | 2022-04-08 | 日东电工株式会社 | Polarizer and polarizing plate |
| WO2019116968A1 (en) * | 2017-12-11 | 2019-06-20 | 住友化学株式会社 | Curable composition, optical layered product, and image display device |
| JP6980815B2 (en) * | 2017-12-26 | 2021-12-15 | 日東電工株式会社 | Polarizing plate with adhesive layer |
| JP2020071241A (en) * | 2018-10-29 | 2020-05-07 | 住友化学株式会社 | Polarizer and manufacturing method therefor |
| JP7202846B2 (en) * | 2018-10-29 | 2023-01-12 | 住友化学株式会社 | Polarizer and manufacturing method thereof |
| CN112840240B (en) * | 2018-11-12 | 2023-04-04 | 日东电工株式会社 | Polarizing film, laminated polarizing film, image display panel, and image display device |
| KR20210089630A (en) * | 2018-11-12 | 2021-07-16 | 닛토덴코 가부시키가이샤 | Polarizing film, polarizing film, laminated polarizing film, image display panel, and image display device |
| TW202422136A (en) * | 2018-11-12 | 2024-06-01 | 日商日東電工股份有限公司 | Method for manufacturing polarizing film, method for manufacturing polarizing thin film, method for manufacturing laminated polarizing thin film, method for manufacturing image display panel, and method for manufacturing image display device wherein the obtained polarizing film has a good initial polarization degree and an excellent effect of suppressing a decrease in monomer transmittance caused by coloration of the polarizing film in a high temperature environment |
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- 2021-04-28 JP JP2021075469A patent/JP2021179604A/en active Pending
- 2021-04-30 CN CN202180033128.6A patent/CN115516346A/en active Pending
- 2021-04-30 KR KR1020227030179A patent/KR20230007310A/en unknown
- 2021-04-30 WO PCT/JP2021/017181 patent/WO2021225114A1/en active Application Filing
- 2021-05-05 TW TW110116258A patent/TW202144819A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| JP2021179604A (en) | 2021-11-18 |
| WO2021225114A1 (en) | 2021-11-11 |
| TW202144819A (en) | 2021-12-01 |
| KR20230007310A (en) | 2023-01-12 |
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