CN114641711A - Image display device and optical member set - Google Patents
Image display device and optical member set Download PDFInfo
- Publication number
- CN114641711A CN114641711A CN202080074267.9A CN202080074267A CN114641711A CN 114641711 A CN114641711 A CN 114641711A CN 202080074267 A CN202080074267 A CN 202080074267A CN 114641711 A CN114641711 A CN 114641711A
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- Prior art keywords
- adhesive
- adhesive layer
- polarizing plate
- image display
- display device
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Images
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
- G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
-
- 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
-
- 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
- C09J201/00—Adhesives based on unspecified macromolecular compounds
-
- 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
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Organic Chemistry (AREA)
- Nonlinear Science (AREA)
- Theoretical Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mathematical Physics (AREA)
- Engineering & Computer Science (AREA)
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Laminated Bodies (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The invention provides an image display device in which a deformed portion is filled with an adhesive and bubbles are significantly suppressed. The image display device of the present invention has: an image display unit; a 1 st polarizing plate including a 1 st polarizer and a 1 st adhesive layer and laminated on a visible side of the image display unit via the 1 st adhesive layer; a 2 nd polarizing plate including a 2 nd polarizer and a 2 nd adhesive layer and laminated on the back surface side of the image display unit via the 2 nd adhesive layer; and a 3 rd adhesive layer disposed on the viewing side of the 1 st polarizer. When the 3 rd adhesive layer was laminated on the 1 st polarizing plate, the storage modulus at 60 ℃ of the adhesive constituting the 3 rd adhesive layer was 1.0X 105Pa or less, and an absolute value of a dimensional shrinkage ratio in an absorption axis direction of the 1 st polarizing plate of 0.7% or less when the polarizing plate is subjected to a heat treatment at 85 ℃ for 24 hours.
Description
Technical Field
The invention relates to an image display device and an optical member set.
Background
In image display devices such as mobile phones and notebook personal computers, optical laminates (e.g., polarizing plates) have been widely used for the purpose of realizing image display and/or improving the performance of the image display. In recent years, it has been desired to use an optical laminate for an image display device equipped with a camera, a smart watch, an instrument panel of an automobile, and the like, and the optical laminate may be processed into a shape other than a rectangular shape (profile processing: formation of a notch or a through hole, for example). On the other hand, in order to impart surface hardness and impact resistance to an image display device, a cover glass may be laminated on the outermost surface of the image display device. When a cover glass is laminated on an image display device including an optical laminate subjected to a profile processing, typically, the profile processing portion is filled with an adhesive for laminating the cover glass. However, in an image display device in which the irregularly shaped processed portion is filled with the adhesive, bubbles may be generated by heat treatment or the like in the manufacturing process.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2016-094569
Disclosure of Invention
Problems to be solved by the invention
The present invention has been made to solve the above-described conventional problems, and a main object thereof is to provide an image display device in which an irregularly shaped processed portion is filled with an adhesive and air bubbles are significantly suppressed.
Means for solving the problems
An image display device of the present invention includes: an image display unit; a 1 st polarizing plate including a 1 st polarizer and a 1 st adhesive layer, and laminated on a visible side of the image display unit via the 1 st adhesive layer; a 2 nd polarizing plate including a 2 nd polarizer and a 2 nd adhesive layer and laminated on the back surface side of the image display unit via the 2 nd adhesive layer; and a 3 rd adhesive layer disposed on a viewing side of the 1 st polarizer. The 1 st polarizing plate and the 2 nd polarizing plate have irregularly shaped processed parts at positions corresponding to each other, and the irregularly shaped processed parts of the 1 st polarizing plate are filled with an adhesive constituting the 3 rd adhesive layer. When the 3 rd adhesive layer was laminated on the 1 st polarizing plate, the storage modulus at 60 ℃ of the adhesive constituting the 3 rd adhesive layer was 1.0X 105Pa or less, and an absolute value of a dimensional shrinkage ratio in an absorption axis direction of the 1 st polarizing plate is 0.7% or less when the polarizing plate is subjected to a heat treatment at 85 ℃ for 24 hours.
An image display device according to another embodiment of the present invention includes: an image display unit; a 1 st polarizing plate including a 1 st polarizer and a 1 st adhesive layer, and laminated on a visible side of the image display unit via the 1 st adhesive layer; and a 3 rd adhesive layer disposed on a viewing side of the 1 st polarizing plate, wherein the 1 st polarizing plate has a deformed portion, the deformed portion of the 1 st polarizing plate is filled with an adhesive constituting the 3 rd adhesive layer, and when the 3 rd adhesive layer is laminated on the 1 st polarizing plate, a storage modulus of the adhesive constituting the 3 rd adhesive layer at 60 ℃ is 1.0 × 105Pa or less, and an absolute value of a dimensional shrinkage ratio in an absorption axis direction of the 1 st polarizing plate is 0.7% or less when the polarizing plate is subjected to a heat treatment at 85 ℃ for 24 hours.
In one embodiment, the adhesive constituting the above-mentioned 3 rd adhesive layer is a photocurable adhesive which is at 60 ℃ before curingStorage modulus of 1.0X 103Pa～1.0×105Pa, and a storage modulus at 60 ℃ of the photocurable adhesive after curing of 5.0X 103Pa～5.0×105Pa, and the thickness of the No. 3 adhesive layer is 50 to 500 μm. In one embodiment, the photocurable adhesive has a gel fraction before curing of 0% to 60% and a gel fraction after curing of 50% to 95%.
In one embodiment, the adhesive constituting the 3 rd adhesive layer is a non-curable adhesive, and the storage modulus at 60 ℃ of the 1 st polarizing plate when the 3 rd adhesive layer is laminated on the 1 st polarizing plate is 1.0 × 103Pa～8.0×104Pa, and the thickness of the 3 rd adhesive layer is 50-1000 μm.
In one embodiment, the 1 st adhesive layer has an elastic modulus of 5.0 × 10 at 85 ℃4Pa or above.
In one embodiment, the thickness of the 1 st polarizer is less than 10 μm. In another embodiment, the thickness of the 1 st polarizer is 10 μm to 20 μm, the thickness of the 1 st polarizer is 100 μm or less, and the 1 st polarizer is subjected to heat shrinking treatment.
In one embodiment, the first polarizing plate 1 has a shaped portion having an adhesive void portion formed by an end face of the first adhesive layer 1 being located on an inner side in a plane direction than an end face of the first polarizing plate 1, and the size of the adhesive void portion is 300 μm or less.
In one embodiment, the 1 st pressure-sensitive adhesive layer and the 3 rd pressure-sensitive adhesive layer have a bonding strength of 2N/25mm or more.
In one embodiment, the deformed portion includes a through-hole or a cut portion which becomes a concave portion in a plan view. In one embodiment, the recess is a V-notch or a U-notch.
In one embodiment, the image display device further includes a cover glass on a visible side of the 3 rd adhesive layer.
In one embodiment, the image display device includes a camera portion at a position corresponding to the deformed portions of the 1 st polarizing plate and the 2 nd polarizing plate.
In one embodiment, the image display device is a liquid crystal display device. In another embodiment, the image display device is an organic EL display device. In one embodiment, the organic EL display device has a camera portion at a position corresponding to the deformed portion of the 1 st polarizing plate.
According to other aspects of the present invention, an optical member set is provided. The optical member set includes: a 1 st polarizing plate disposed on a visible side of the image display unit, the 1 st polarizing plate including a 1 st polarizer and a 1 st adhesive layer, having a shaped portion, and having an absolute value of a dimensional shrinkage rate in an absorption axis direction thereof of 0.7% or less when subjected to a heat treatment at 85 ℃ for 24 hours; and an adhesive sheet having a substrate and a 3 rd adhesive layer provided on the substrate, wherein when the 3 rd adhesive layer is laminated on the 1 st polarizing plate, the adhesive constituting the 3 rd adhesive layer has a storage modulus at 60 ℃ of 1.0X 105Pa or less, the adhesive constituting the 3 rd adhesive layer fills the irregularly shaped processed portion of the 1 st polarizing plate.
In one embodiment, the adhesive constituting the above-mentioned 3 rd adhesive layer is a photocurable adhesive having a storage modulus at 60 ℃ of 1.0 × 10 before curing3Pa～1.0×105Pa, the storage modulus at 60 ℃ of the photocurable adhesive after curing is 5.0X 103Pa～5.0×105Pa, and the thickness of the No. 3 adhesive layer is 50 to 500 μm. In one embodiment, the photocurable adhesive has a gel fraction before curing of 0% to 60% and a gel fraction after curing of 50% to 95%.
In one embodiment, the adhesive constituting the 3 rd adhesive layer is a non-curable adhesive, and the storage modulus at 60 ℃ of the 1 st polarizing plate when the 3 rd adhesive layer is laminated on the 1 st polarizing plate is 1.0 × 103Pa～8.0×104Pa, and the thickness of the 3 rd adhesive layer is 50-1000 μm.
In one embodiment, the first polarizing plate 1 has a shaped portion having an adhesive void portion formed by an end face of the first adhesive layer 1 being located on an inner side in a plane direction than an end face of the first polarizing plate 1, and the size of the adhesive void portion is 300 μm or less.
In one embodiment, the optical member group further includes a 2 nd polarizing plate disposed on a back surface side of the image display unit, the 2 nd polarizing plate includes a 2 nd polarizer and has a deformed portion, and the 1 st polarizing plate and the 2 nd polarizing plate have deformed portions at positions corresponding to each other.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the embodiment of the present invention, in the image display device in which the irregularly shaped processed portion is filled with the adhesive, the storage modulus of the adhesive filling the irregularly shaped processed portion at the time of lamination (at the time of filling the irregularly shaped processed portion) is set to a predetermined range, and the absolute value of the heating dimension shrinkage rate of the visible-side polarizing plate in the absorption axis direction of the polarizer is controlled to a predetermined value or less, whereby an image display device in which bubbles are significantly suppressed can be realized.
Drawings
Fig. 1 is an exploded perspective view of an image display device according to an embodiment of the present invention.
Fig. 2 is a schematic sectional view of a through hole portion of the image display device of fig. 1.
Fig. 3 is a schematic plan view illustrating an example of the deformed or deformed portion in the 1 st polarizing plate and the 2 nd polarizing plate of the image display device according to the embodiment of the present invention.
Fig. 4 is a schematic plan view illustrating a modification of the deformed or deformed portion in the 1 st polarizing plate and the 2 nd polarizing plate of the image display device according to the embodiment of the present invention.
Fig. 5 is a schematic plan view illustrating another modification of the deformed or deformed portion in the 1 st polarizing plate and the 2 nd polarizing plate of the image display device according to the embodiment of the present invention.
Fig. 6 is a schematic plan view illustrating another modification of the deformed or deformed portion in the 1 st polarizing plate and the 2 nd polarizing plate of the image display device according to the embodiment of the present invention.
Fig. 7 is a schematic partial cross-sectional view illustrating an adhesive void portion in the 1 st polarizing plate of the image display device according to the embodiment of the present invention.
Description of the symbols
10 st polarizing plate
11 st polarizer
12 outer protective layer
13 inner side protective layer
14 st adhesive layer
15 special-shaped processing part
20 nd 2 polarizing plate
21 nd 2 polarizer
22 outer protective layer
23 inner protective layer
24 nd 2 adhesive layer
25 special-shaped processing part
30 No. 3 adhesive layer
40 cover glass
100 image display unit
200 image display device
Detailed Description
Specific embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to these embodiments. The drawings are schematically illustrated for easy observation, and the ratios of the length, width, thickness, and the like, and the angles and the like in the drawings are different from those in reality.
A. Integral structure of image display device
Fig. 1 is an exploded perspective view of an image display device according to an embodiment of the present invention; fig. 2 is a schematic sectional view of a through hole portion of the image display device of fig. 1. The image display device 200 of the illustrated example has: the image display device includes an image display unit 100, a 1 st polarizing plate 10 laminated on a visible side of the image display unit 100, a 2 nd polarizing plate 20 laminated on a back side of the image display unit 100, and a 3 rd adhesive layer 30 disposed on the visible side of the 1 st polarizing plate 10. In one embodiment, the image display device 200 may be provided with the No. 3 adhesiveThe visible side of layer 30 further has a cover glass 40. That is, the cover glass 40 may be attached to the 1 st polarizer 10 via the 3 rd adhesive layer 30. The 1 st polarizing plate 10 has: the image display device includes a 1 st polarizer 11, a protective layer (outer protective layer) 12 disposed on the visible side of the 1 st polarizer 11, a protective layer (inner protective layer) 13 disposed on the image display unit 100 side of the 1 st polarizer 11, and a 1 st adhesive layer 14 disposed as the outermost layer on the image display unit side. The 1 st polarizing plate 10 is laminated on the image display unit 100 via the 1 st adhesive layer 14. One of the protective layers 12 and 13 may be omitted depending on the purpose. The 2 nd polarizing plate 20 has: a 2 nd polarizer 21, a protective layer (outer protective layer) 22 disposed on the back side of the 2 nd polarizer 21, a protective layer (inner protective layer) 23 disposed on the image display unit 100 side of the 2 nd polarizer 21, and a 2 nd adhesive layer 24 disposed as the outermost layer on the image display unit side. The 2 nd polarizing plate 20 is laminated on the image display unit 100 via the 2 nd adhesive layer 24. One of the protective layers 22 and 23 may be omitted depending on the purpose. Typically, the 1 st and 2 nd polarizing plates 10 and 20 are arranged such that the absorption axis A of the 1 st polarizer 11 is1Absorption axis A of 2 nd polarizer 212Are arranged in a substantially orthogonal manner. In the example of the figure, A1Is recorded as the length direction, A2Note that the short side direction is used, but the opposite may be used. In the present specification, "substantially orthogonal" includes a case where the angle formed by the 2 directions is 90 ° ± 7 °, preferably 90 ° ± 5 °, and more preferably 90 ° ± 3 °. "substantially parallel" includes the case where the angle formed by the 2 directions is 0 ° ± 7 °, preferably 0 ° ± 5 °, and more preferably 0 ° ± 3 °. In the present specification, the term "orthogonal" or "parallel" merely means "substantially orthogonal" or "substantially parallel". In the present specification, the term "angle" includes both clockwise and counterclockwise directions with respect to the reference direction.
The 1 st polarizing plate 10 has the odd-shaped processed portion 15, and the 2 nd polarizing plate 20 has the odd-shaped processed portion 25. The 1 st polarizing plate 10 and the 2 nd polarizing plate 20 have irregularly shaped processed portions 15 and 25 at positions corresponding to each other. The heteromorphic processed portion 15 of the 1 st polarizer 10 is typically filled with an adhesive constituting the 3 rd adhesive layer 30. In the present specification, "provided at positions corresponding to each other" means that the irregularly shaped processed portions overlap when 2 polarizers are stacked. In the present specification, the term "deformed portion" refers to a portion which is formed into a special shape (e.g., a rectangle or a chamfer at a corner) different from a conventional shape. As shown in fig. 3 and 4, typical examples of the deformed portion include: a through hole and a cutting portion serving as a recess in a plan view. Typical examples of the concave portion include a shape close to a boat shape, a V-shaped notch, and a U-shaped notch. Further, the 1 st polarizing plate and the 2 nd polarizing plate may be integrally subjected to profile processing. As an example of this, a shape corresponding to the dashboard of the automobile as shown in fig. 5 and 6 can be cited. In this shape, the outer edge is formed in an arc shape along the rotation direction of the instrument hand, and includes a portion where the outer edge is formed in a V-shape (including an arc shape) protruding inward in the plane direction. The deformed portion may be provided at any appropriate position according to the purpose. Representatively, the irregularly shaped processed portions may be provided at or near the end portions of the respective polarizing plates. With such a configuration, the influence on the image display can be minimized. For example, as shown in fig. 4, the irregularly shaped processed portions may be provided at substantially the center of the longitudinal ends of the rectangular polarizing plate, at predetermined positions on the longitudinal ends, or at the corners of the polarizing plate. In the illustrated example, the irregularly shaped processed portions are provided at the longitudinal ends, but the irregularly shaped processed portions may be provided at the short-side ends. Further, as shown in the right side of the 2 nd and 3 rd stages of fig. 4, a plurality of special-shaped processed portions may be provided. For example, as shown in fig. 4, 2 or more through-holes may be provided, or a combination of a through-hole and a notch may be provided, or 2 or more notches may be provided, although not shown.
The image display device includes an image display panel. The image display panel includes an image display unit. The image display device is sometimes referred to as an optical display device. The image display panel is sometimes referred to as an optical display panel. The image display unit is sometimes referred to as an optical display unit.
As the image display unit 100, there are representatively exemplified: liquid crystal cells, organic Electroluminescence (EL) cells, quantum dot cells. Therefore, the image display device 200 is typically a liquid crystal display device, an organic EL display device, or a quantum dot display device. The configuration of the liquid crystal display device is representatively shown in the drawing example. In a liquid crystal display device, the effect of the combination of the 1 st polarizing plate and the 2 nd polarizing plate becomes remarkable. In the organic EL display device, the 2 nd polarizing plate 20 may be omitted. In one embodiment, the image display device 200 includes a camera unit (not shown) at a position corresponding to the heteromorphic processing units 15 and 25.
In the embodiment of the present invention, when the 3 rd adhesive layer 30 is laminated on the 1 st polarizing plate 10, the storage modulus of the adhesive constituting the 3 rd adhesive layer 30 at 60 ℃ is 1.0 × 104Pa～1.0×105Pa. As long as the adhesive constituting the 3 rd adhesive layer has such a storage modulus at the time of lamination, any appropriate adhesive may be used. Specifically, the adhesive may be a photocurable adhesive or a non-curable adhesive. In the present specification, the term "photocurable adhesive" refers to an adhesive in which a crosslinking reaction proceeds by irradiation with light. Therefore, the photocurable adhesive is soft and excellent in deformability during lamination, and can be provided with desired characteristics (for example, storage modulus) in the form of an adhesive layer by light irradiation after lamination. This provides a photocurable adhesive with excellent filling properties into the irregularly shaped processed portion, and the thickness of the 3 rd adhesive layer (resulting in an image display device) can be reduced. Further, even when a thick frame printing layer is formed on the cover glass, for example, good adhesion can be secured. The term "non-curable adhesive" refers to an adhesive in which the crosslinking reaction is substantially completed and the crosslinking reaction does not substantially progress after lamination. In other words, the non-curable adhesive may be a so-called conventional adhesive. The non-curable adhesive is excellent in productivity because it does not require light irradiation (photocuring), and further, can prevent the occurrence of scratches, the bleeding of the adhesive from the end of a punched product, defective handling, and the like.
Photocurable adhesives at 60 ℃ before curingThe storage modulus may substantially correspond to the storage modulus at lamination as described above. As described above, the storage modulus before curing was 1.0X 105Pa or less, preferably 1.0X 103Pa～1.0×105Pa. The storage modulus of the photocurable adhesive after curing at 60 ℃ is preferably 5.0 × 103Pa～5.0×105Pa. The photocurable adhesive has a gel fraction before curing of 0 to 60% and a gel fraction after curing of 50 to 95%. When the 3 rd adhesive layer is composed of a photocurable adhesive, the thickness of the 3 rd adhesive layer is preferably 50 to 500 μm, more preferably 75 to 475 μm, and still more preferably 100 to 450 μm.
The non-curable adhesive preferably has a storage modulus at 60 ℃ of 1.0X 10 when laminated3Pa～8.0×104Pa, more preferably 5.0X 103Pa～6.0×104Pa. When the 3 rd adhesive layer is composed of a non-curable adhesive, the thickness of the 3 rd adhesive layer is preferably 50 to 1000 μm, more preferably 75 to 900 μm, and still more preferably 100 to 800 μm.
In the embodiment of the present invention, the absolute value of the dimensional shrinkage ratio (also referred to as a heating dimensional shrinkage ratio in the present specification) in the absorption axis direction of the 1 st polarizer when the 1 st polarizing plate 10 is further subjected to a heat treatment at 85 ℃ for 24 hours is 0.7% or less, preferably 0.6% or less, more preferably 0.5% or less, still more preferably 0.4% or less, and particularly preferably 0.3% or less. The smaller the absolute value of the heat dimensional shrinkage is, the more preferable the lower limit thereof may be, for example, 0.05%. Typically, the heat dimensional shrinkage ratio is negative. In one embodiment, the thickness of the 1 st polarizer 11 in the 1 st polarizing plate is preferably less than 10 μm, more preferably 8 μm or less, still more preferably 6 μm or less, and particularly preferably 5 μm or less. The lower limit of the thickness may be, for example, 1 μm. In another embodiment, the thickness of the 1 st polarizer 11 is preferably 10 μm to 20 μm, more preferably 12 μm to 18 μm. In this case, the thickness of the 1 st polarizing plate 10 is preferably 100 μm or less, more preferably 80 μm or less, and further preferably 60 μm or less. The lower limit of the thickness may be, for example, 40 μm. In this case, it is preferable that the 1 st polarizing plate (substantially 1 st polarizer) is subjected to heat shrinkage treatment. The heat-shrinking treatment may be performed at 60 ℃ for 12 hours, for example. Note that the thickness of the 1 st polarizing plate includes the thickness of the adhesive for bonding the polarizer and the protective layer together, and does not include the thickness of the 1 st adhesive layer.
By forming the 3 rd adhesive layer and the 1 st polarizing plate in the above-described configuration, bubbles can be significantly suppressed in the image display device in which the irregularly shaped processed portion is filled with the adhesive. In particular, the generation of bubbles called so-called delayed bubbles can be significantly suppressed. The details are as follows. Filling of the deformed portion with the adhesive constituting the 3 rd adhesive layer can be performed typically by attaching a laminate of a cover glass and an adhesive sheet constituting the 3 rd adhesive layer to the 1 st polarizing plate by vacuum lamination. Immediately after vacuum lamination, no recognizable bubbles are often present in the filled portion, but bubbles may be generated in a subsequent heating durability test of the image display device. Such bubbles may be typically generated by applying a shrinkage stress of the polarizing plate to the filling portion. Such bubbles are referred to as delayed bubbles. The delayed bubbles are not fine bubbles, but large bubbles occupying a certain proportion or more of the area of the irregular processed portion in a plan view, and are not allowed from the viewpoint of appearance or from the viewpoint of camera performance of a camera portion provided at a position corresponding to the irregular processed portion. It is presumed that the above-described configuration can alleviate the residual stress in the filled portion to suppress deformation of the adhesive due to heating or the like, and as a result, can suppress delayed bubbling. Further, as described above, by making the thickness of the 1 st polarizer less than 10 μm, the desired (absolute value of) the heat dimensional shrinkage ratio can be achieved without performing the heat shrinkage treatment. Therefore, by omitting the heat shrinkage treatment, not only the productivity can be improved, but also the occurrence of dimensional change, curling, and the like can be prevented. Further, by reducing the thickness of the 1 st polarizer (1 st polarizing plate) and constituting the 3 rd adhesive layer with a non-curable adhesive, heat shrinkage treatment can be omitted and light irradiation (photo-curing) can be omitted, so that productivity can be further improved. Further, by reducing the thickness of the 1 st polarizer (1 st polarizing plate) and forming the 3 rd adhesive layer with a photocurable adhesive, even when the size of the irregularly shaped processed portion is small (for example, the diameter of the through-hole is small, the depth and angle of the V-notch is small, and the depth and radius of curvature of the U-notch is small), and/or when a plurality of through-holes are formed close to each other, the delay bubble can be suppressed remarkably.
In one embodiment, as shown in fig. 7, the shaped processed portion 15 of the 1 st polarizing plate 10 has an adhesive gap 16, and the adhesive gap 16 is formed such that the end face of the 1 st adhesive layer 14 is positioned more inward in the plane direction than the end face of the 1 st polarizing plate (substantially, the polarizer 11, or the inner protective layer 13 when present). The size L of the voids in the adhesive is preferably 300 μm or less, more preferably 200 μm or less, still more preferably 150 μm or less, particularly preferably 100 μm or less, and particularly preferably 80 μm or less. The lower limit of the size L of the adhesive void portion may be, for example, 10 μm. In the present specification, the "size L of the adhesive gap portion" means the maximum length from the end face of the 1 st polarizing plate (substantially, the polarizer 11 or, if present, the inner protective layer 13) to the end face of the adhesive layer 14.
The image display device 200 may have a backlight unit (not shown) corresponding to the configuration of the image display unit 100. As for the backlight unit, since a configuration well known in the art can be adopted, detailed description thereof is omitted.
A phase difference layer (not shown) may be provided in the image display device 200 as necessary. The kind, number, combination, arrangement position, and characteristics of the retardation layer can be appropriately set according to the purpose. For example, the retardation layer may be a λ/2 wave plate, a λ/4 wave plate, or a laminate thereof. The λ/2 plate and the λ/4 plate typically have refractive index characteristics of nx > ny ≧ nz. The in-plane retardation Re (550) of the lambda/2 wave plate is preferably 180nm to 320nm, and the in-plane retardation Re (550) of the lambda/4 wave plate is preferably 100nm to 200 nm. In addition, for example, the phase difference layer may be a laminate of a negative B plate (nx > ny > nz) and a positive C plate (nz > nx ═ ny) or a positive B plate (nz > nx > ny). In the present specification, "Re (λ)" is an in-plane retardation measured at 23 ℃ with light having a wavelength of λ nm. For example, "Re (550)" is an in-plane retardation measured at 23 ℃ with light having a wavelength of 550 nm. When the thickness of the layer (film) is d (nm), Re (λ) can be represented by the formula: re (λ) ═ (nx-ny) × d. "Rth (λ)" is a phase difference in the thickness direction measured at 23 ℃ with light of a wavelength λ nm. For example, "Rth (550)" is a phase difference in the thickness direction measured at 23 ℃ with light having a wavelength of 550 nm. When the thickness of the layer (film) is d (nm), Rth (λ) can be represented by the formula: rth (λ) ═ n x-nz × d. "nx" is a refractive index in a direction in which a refractive index in a plane becomes maximum (i.e., slow axis direction), "ny" is a refractive index in a direction orthogonal to the slow axis in a plane (i.e., fast axis direction), and "nz" is a refractive index in a thickness direction.
An optical member (not shown) may be provided in the image display device 200 as necessary. The kind, number, combination, arrangement position, and characteristics of the optical members may be appropriately set according to the purpose. For example, a reflective polarizer, a prism sheet, and/or a diffusion plate may be provided on the back surface side of the 2 nd polarizing plate. The reflective polarizer may also be used as an outer protective layer for the 2 nd polarizer.
Hereinafter, the components of the image display device will be specifically described. The following description will be given by taking the 1 st polarizing plate and the 2 nd polarizing plate together as polarizing plates, the 1 st polarizer and the 2 nd polarizer together as polarizing mirrors, the 1 st polarizing plate and the 2 nd polarizing plate together as protective layers, and the 1 st adhesive layer and the 2 nd adhesive layer together as adhesive layers. Therefore, for example, when the term "polarizing plate" is used, the terms "1 st polarizing plate and 2 nd polarizing plate" may be used. On the other hand, for example, when it is necessary to separately explain the 1 st polarizing plate and the 2 nd polarizing plate, it is explicitly referred to as "1 st" or "2 nd". Since the cover glass can be formed by a structure known in the art, the detailed description thereof will be omitted.
B. Polarizing plate
B-1. polarizer
Typically, the polarizer is formed of a resin film containing a dichroic material. As the resin film, any appropriate resin film that can be used as a polarizer can be used. Typically, the resin film is a polyvinyl alcohol resin (hereinafter referred to as "PVA-based resin") film. The resin film may be a single-layer resin film or a laminate of two or more layers.
As a specific example of the polarizer made of a single-layer resin film, there is a polarizer obtained by subjecting a PVA-based resin film to a dyeing treatment with iodine and a stretching treatment (typically, uniaxial stretching). The dyeing with iodine can be performed by, for example, immersing the PVA-based film in an aqueous iodine solution. The stretching ratio of the uniaxial stretching is preferably 3 to 7 times. The stretching may be performed after the dyeing treatment, or may be performed while dyeing. In addition, dyeing may be performed after stretching. The PVA-based resin film may be subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment, and the like as necessary. For example, by immersing the PVA-based resin film in water and washing it with water before dyeing, not only dirt and an antiblocking agent on the surface of the PVA-based film can be washed off, but also the PVA-based resin film can be swollen to prevent uneven dyeing and the like.
Specific examples of the polarizer obtained using the laminate include: a polarizer obtained by using a laminate of a resin base material and a PVA type resin layer (PVA type resin film) laminated on the resin base material, or a laminate of a resin base material and a PVA type resin layer formed on the resin base material by coating. A polarizer obtained by using a laminate of a resin substrate and a PVA type resin layer formed on the resin substrate by coating can be produced by the following method: for example, a laminate of a resin substrate and a PVA type resin layer is obtained by applying a PVA type resin solution to the resin substrate and drying the solution to form the PVA type resin layer on the resin substrate; the laminate is stretched and dyed to produce a polarizer from the PVA type resin layer. In the present embodiment, the stretching typically includes performing stretching by immersing the laminate in an aqueous boric acid solution. Further, the stretching may further include stretching the laminate in a gas atmosphere at a high temperature (for example, 95 ℃ or higher) before the stretching in the boric acid aqueous solution, as necessary. The obtained resin base material/polarizer laminate may be used as it is (that is, the resin base material may be used as a protective layer for the polarizer), or the resin base material may be peeled off from the resin base material/polarizer laminate and an arbitrary appropriate protective layer according to the purpose may be laminated on the peeled surface. Details of such a method for producing a polarizer are described in, for example, japanese patent laid-open publication No. 2012 and 73580 and japanese patent No. 6470455. The entire disclosure of this publication is incorporated herein by reference.
The thickness of the 1 st polarizer is as described in the above item a. The thickness of the 2 nd polarizer may be appropriately set according to the purpose. For example, the thickness of the 2 nd polarizer is preferably 1 μm to 30 μm, more preferably 2 μm to 15 μm, and still more preferably 1 μm to 10 μm. When the thickness of the 2 nd polarizer is in such a range, curling during heating can be favorably suppressed, and favorable durability of appearance during heating can be obtained.
The polarizer preferably exhibits dichroism of absorption at any wavelength of 380nm to 780 nm. The polarizer has a single transmittance of, for example, 41.5% to 46.0%, preferably 43.0% to 46.0%, and more preferably 44.5% to 46.0%. The degree of polarization of the polarizer is preferably 97.0% or more, more preferably 99.0% or more, and still more preferably 99.9% or more.
B-2 protective layer
The protective layer may be formed of any suitable film that can be used as a protective layer for the polarizer. Specific examples of the material to be the main component of the film include: cellulose resins such as cellulose Triacetate (TAC), polyesters, polyvinyl alcohols, polycarbonates, polyamides, polyimides, polyether sulfones, polysulfones, polystyrenes, polynorbornenes, polyolefins, (meth) acrylic acids, and transparent resins such as acetates. In addition, there may be enumerated: thermosetting resins such as (meth) acrylic resins, urethane resins, (meth) acrylic urethane resins, epoxy resins, silicone resins, and ultraviolet-curable resins. In addition to these, for example, glassy polymers such as siloxane polymers can be cited. Further, the polymer film described in Japanese patent application laid-open No. 2001-343529 (WO01/37007) may be used. As a material of the film, for example, a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in a side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and a nitrile group in a side chain can be used, and examples thereof include: a resin composition having an alternating copolymer of isobutylene and N-methylmaleimide, and an acrylonitrile-styrene copolymer. The polymer film may be, for example, an extrusion-molded product of the above resin composition.
If necessary, the outer protective layer (particularly, the outer protective layer 12 of the 1 st polarizing plate) may be subjected to surface treatment such as hard coating treatment, antireflection treatment, anti-sticking treatment, antiglare treatment, or the like.
The inner protective layer is preferably optically isotropic. In the present specification, the phrase "optically isotropic" means that the in-plane retardation Re (550) is from 0nm to 10nm and the retardation Rth (550) in the thickness direction is from-10 nm to +10 nm.
The thickness of the protective layer may be any suitable thickness. The thickness of the protective layer is, for example, 15 to 45 μm, preferably 20 to 40 μm. When the surface treatment is performed, the thickness of the protective layer is a thickness including the thickness of the surface treatment layer.
C. Adhesive layer
The adhesive layer is typically used to attach each polarizer to the image display unit. The adhesive layer may be representatively composed of an acrylic adhesive (acrylic adhesive composition). The acrylic adhesive composition typically contains a (meth) acrylic polymer as a base polymer. The (meth) acrylic polymer may be contained in the adhesive composition in a proportion of, for example, 50% by weight or more, preferably 70% by weight or more, and more preferably 90% by weight or more, of the solid content of the adhesive composition. The (meth) acrylic polymer contains, as a main component, an alkyl (meth) acrylate as a monomer unit. The term (meth) acrylate refers to acrylate and/or methacrylate. The (meth) acrylic polymer may contain the alkyl (meth) acrylate in a proportion of preferably 70% by weight or more, more preferably 80% by weight or more, of the monomer components forming the (meth) acrylic polymer. Examples of the alkyl group of the alkyl (meth) acrylate include a linear or branched alkyl group having 1 to 18 carbon atoms. The average carbon number of the alkyl group is preferably 3 to 9, more preferably 3 to 6. Specific examples of the alkyl (meth) acrylate include: methyl acrylate, methyl methacrylate, butyl acrylate, 2-ethylhexyl acrylate. Examples of the monomer (comonomer) constituting the (meth) acrylic polymer include, in addition to the alkyl (meth) acrylate, a carboxyl group-containing monomer, a hydroxyl group-containing monomer, an amide group-containing monomer, a polyfunctional (meth) acrylate, an aromatic ring-containing (meth) acrylate, and a heterocyclic vinyl group-containing monomer. Typical examples of the comonomer include acrylic acid, 2-hydroxyethyl acrylate, 4-hydroxybutyl acrylate, phenoxyethyl acrylate, N-vinyl-2-pyrrolidone and N-acryloylmorpholine. The acrylic adhesive composition may preferably contain a silane coupling agent and/or a crosslinking agent. Examples of the silane coupling agent include an epoxy group-containing silane coupling agent. Examples of the crosslinking agent include: isocyanate crosslinking agents and peroxide crosslinking agents. The acrylic adhesive composition may contain an additive. Specific examples of the additives include: antioxidant, antistatic agent, reworkability improver, colorant, pigment, dye, surfactant, plasticizer, tackifier, surface lubricant, leveling agent, softener, antiaging agent, light stabilizer, ultraviolet absorber, polymerization inhibitor, conductive agent, inorganic or organic filler, metal powder, particle, and foil. In addition, redox systems with addition of reducing agents can also be employed within controlled limits. The kind, amount, combination, blending amount and the like of the additives can be appropriately set according to the purpose. By appropriately adjusting the type, combination, and blending amount of the monomer components, the type, amount, combination, blending amount, and the like of the crosslinking agent, silane coupling agent, and additive, an acrylic pressure-sensitive adhesive composition (as a result, a pressure-sensitive adhesive layer) having desired characteristics according to the purpose can be obtained. The details of the adhesive layer or the acrylic adhesive composition are described in, for example, japanese patent laid-open nos. 2006-183022, 2015-199942, 2018-053114, 2016-190996 and international publication No. 2018/008712, and the descriptions of these publications are incorporated herein by reference.
The thickness of the pressure-sensitive adhesive layer is preferably 50 μm or less, more preferably 40 μm or less, still more preferably 30 μm or less, and particularly preferably 25 μm or less. The lower limit of the thickness of the adhesive layer may be, for example, 2 μm. If the thickness of the adhesive layer is in such a range, it can contribute to thinning of the image display device. In particular, if the thickness of the 1 st pressure-sensitive adhesive layer is in such a range, filling of the deformed portion with the pressure-sensitive adhesive constituting the 3 rd pressure-sensitive adhesive layer becomes easy. More specifically, the depth of the deformed portion becomes small, and thus it is easily buried by the adhesive. As a result, the gap in the deformed portion is reduced, and therefore, air bubbles are less likely to be generated due to deformation of the adhesive. As a result, if the thickness of the 1 st adhesive layer is in such a range, it can contribute to the suppression of the delay bubbles.
The adhesive strength between the adhesive constituting the adhesive layer (particularly, the 1 st adhesive layer) and the adhesive constituting the 3 rd adhesive layer is preferably 2N/25mm or more, more preferably 5N/25mm or more, and still more preferably 10N/25mm or more. The upper limit of the adhesion force may be, for example, 50N/25 mm. As can be understood from fig. 2, as a result of the 1 st adhesive layer and the 3 rd adhesive layer being able to come into contact, when their adhesion is large, the 1 st adhesive layer and the 3 rd adhesive layer are not easily peeled off even if the adhesive is deformed or the like. As a result, a gap is not easily formed in the deformed portion, and delayed bubbles can be suppressed. The adhesion can be measured based on the "90-degree peel strength test" of JIS Z0237.
The elastic modulus of the adhesive layer at 85 ℃ is preferably 5.0X 104Pa or more, more preferably 1.0X 105Pa or above. The upper limit of the elastic modulus of the pressure-sensitive adhesive layer may be, for example, 1.0 × 106Pa. If the elastic modulus of the adhesive layer is in such a range, the absolute value of the dimensional shrinkage of the polarizing plate can be reduced. In particular, if the elastic modulus of the 1 st adhesive layerWithin such a range, the dimensional shrinkage of the 1 st polarizer can be suppressed based on the synergistic effect with the 3 rd adhesive layer.
D. No. 3 adhesive layer
The 3 rd adhesive layer 30 is composed of an adhesive having a given storage modulus at the time of lamination as described in the above item a, and the adhesive can fill the irregularly shaped processed portion 15 of the 1 st polarizing plate 10. First, the properties of the 3 rd adhesive layer and the photocurable adhesive constituting the 3 rd adhesive layer will be described, and then, the non-curable adhesive will be briefly described.
D-1. characteristics of adhesive layer No. 3
The glass transition temperature of the 3 rd adhesive layer is preferably-3 ℃ or lower, more preferably-5 ℃ or lower, and still more preferably-6 ℃ or lower. On the other hand, the glass transition temperature is preferably-20 ℃ or higher, more preferably-15 ℃ or higher, and still more preferably-13 ℃ or higher. If the glass transition temperature is in such a range, a 3 rd adhesive layer having excellent impact resistance can be realized.
The peak top value of the loss tangent tan δ (i.e., tan δ at the glass transition temperature) of the 3 rd pressure-sensitive adhesive layer is preferably 1.5 or more, more preferably 1.6 or more, further preferably 1.7 or more, and particularly preferably 1.75 or more. On the other hand, the upper limit of the peak top value of tan δ is preferably 3.0 or less, more preferably 2.5 or less, and further preferably 2.3 or less. If the peak top value of tan δ is in such a range, the 3 rd pressure-sensitive adhesive layer exhibits appropriate deformation behavior (viscoelastic behavior), and therefore, a gap is not easily formed in the irregularly shaped processed portion, and delayed foaming can be suppressed.
The total light transmittance of the 3 rd adhesive layer is preferably 85% or more, more preferably 90% or more. The haze value of the 3 rd adhesive layer is preferably 1.5% or less, more preferably 1.0% or less.
D-2. Photocurable adhesive
D-2-1 Properties of Photocurable adhesive
As described above, the storage modulus at 60 ℃ before curing of the photocurable adhesive was 1.0X 105Pa or less, preferably 1.0X 103Pa～1.0×105Pa, more preferably 5.0X 103Pa～8.0×104Pa, more preferably 7.5X 103Pa～6.0×104Pa. If the storage modulus of the photocurable adhesive before curing is in such a range, the photocurable adhesive exhibits appropriate deformation behavior (viscoelastic behavior) and can flow well into each corner of the irregularly shaped processed part. As a result, a gap is not easily formed in the deformed portion, and delayed bubbles can be suppressed. The storage modulus of the photocurable adhesive after curing at 60 ℃ is preferably 5.0 × 103Pa～5.0×105Pa, more preferably 7.5X 103Pa～4.0×105Pa, more preferably 8.0X 103Pa～3.0×105Pa. If the storage modulus of the photocurable adhesive after curing is in such a range, the gel elasticity of the 3 rd adhesive becomes low and the residual stress becomes small. As a result, delayed bubbles can be suppressed.
The gel fraction of the photocurable adhesive before curing is preferably 0% to 60%, more preferably 0% to 55%, and still more preferably 0% to 50%. If the gel fraction of the photocurable adhesive before curing is in such a range, the desired storage modulus as described above is easily achieved. Therefore, the photocurable adhesive exhibits appropriate deformation behavior (viscoelastic behavior) and can satisfactorily flow into each corner of the irregularly shaped processed part. As a result, a gap is not easily formed in the deformed portion, and delayed bubbling can be suppressed. The gel fraction of the photocurable adhesive after curing is preferably 50% to 95%, more preferably 55% to 93%, and still more preferably 60% to 90%. When the gel fraction of the photocurable adhesive after curing is in such a range, the cover glass, the 1 st polarizing plate and the image display unit can be firmly fixed. As a result, delayed bubbles can be suppressed. The gel fraction can be determined as an insoluble fraction with respect to a solvent such as ethyl acetate. Specifically, the gel fraction can be determined as the weight fraction (unit: weight%) of the insoluble component after the adhesive constituting the adhesive layer was immersed in ethyl acetate at 23 ℃ for 7 days, relative to the sample before immersion. The gel fraction can be adjusted by appropriately setting the kind, combination, and blending amount of the monomer components constituting the base polymer of the pressure-sensitive adhesive, and the kind, blending amount, and the like of the crosslinking agent.
D-2-2. constituent Material of Photocurable adhesive
As the photocurable adhesive, any appropriate photocurable adhesive (in this case, simply referred to as an adhesive composition) can be used as long as it has the above-described characteristics. Examples of the base polymer of the adhesive composition include: rubber-based polymers such as (meth) acrylic polymers, silicone-based polymers, polyesters, polyurethanes, polyamides, polyvinyl ethers, vinyl acetate/vinyl chloride copolymers, modified polyolefins, epoxy-based polymers, fluorine-based polymers, natural rubbers, and synthetic rubbers. A (meth) acrylic adhesive composition containing a (meth) acrylic polymer as a base polymer is preferable. This is because it is excellent in optical transparency, exhibits appropriate adhesive properties such as wettability, cohesiveness and adhesiveness, and is also excellent in weather resistance and heat resistance. In the present specification, "(meth) acrylic acid" means acrylic acid and/or methacrylic acid.
The (meth) acrylic base polymer (hereinafter, may be simply referred to as a base polymer) preferably has a crosslinked structure.
(meth) acrylic base polymer
The (meth) acrylic base polymer contains an alkyl (meth) acrylate as a main monomer component. As the alkyl (meth) acrylate, an alkyl (meth) acrylate having an alkyl group with 1 to 20 carbon atoms can be suitably used. The alkyl group of the alkyl (meth) acrylate may have a branch or may have a cyclic alkyl group. The amount of the alkyl (meth) acrylate is preferably 40% by weight or more, more preferably 50% by weight or more, and still more preferably 60% by weight or more, based on the total amount of the monomer components constituting the (meth) acrylic base polymer. The amount of the alkyl (meth) acrylate having a chain alkyl group having 4 to 10 carbon atoms is preferably 30% by weight or more, more preferably 40% by weight or more, and still more preferably 45% by weight or more, based on the total amount of the monomer components constituting the (meth) acrylic base polymer, from the viewpoint of setting the glass transition temperature (Tg) of the polymer chain within an appropriate range.
The (meth) acrylic base polymer preferably contains a monomer component having a crosslinkable functional group. With such a configuration, the gel fraction of the adhesive can be adjusted to a desired range. Examples of the monomer component having a crosslinkable functional group include: hydroxyl-containing monomers and carboxyl-containing monomers. When the crosslinked structure is introduced by an isocyanate crosslinking agent, a hydroxyl group becomes a reaction site with an isocyanate group, and when the crosslinked structure is introduced by an epoxy crosslinking agent, a carboxyl group becomes a reaction site with an epoxy group. Preferably, a hydroxyl group-containing monomer is used as a monomer component having a crosslinkable functional group, and a crosslinked structure is introduced by an isocyanate-based crosslinking agent. With such a constitution, the 3 rd pressure-sensitive adhesive layer having high transparency can be obtained while improving the crosslinkability of the base polymer. In addition, if such a constitution is adopted, a so-called acid-free binder can be realized.
The amount of the hydroxyl group-containing monomer is preferably 5 to 30% by weight, more preferably 8 to 25% by weight, and still more preferably 10 to 20% by weight, based on the total amount of the monomer components constituting the (meth) acrylic base polymer. When the amount of the hydroxyl group-containing monomer is within such a range, the degree of crosslinking (gel fraction) can be increased with a small amount of the crosslinking agent, and as a result, the filling property and handling property of the irregularly shaped processed portion of the photocurable adhesive before curing can be improved. Further, after crosslinking, unreacted hydroxyl groups can form intermolecular hydrogen bonds, and therefore, a desired storage modulus can be achieved even if the gel fraction is small.
In the case where the 3 rd adhesive layer can be brought into contact with a touch panel sensor, for example, the acid content of the 3 rd adhesive layer is preferably small in order to prevent corrosion of the electrode due to an acid component. In this case, the amount of the carboxyl group-containing monomer is preferably 0.5% by weight or less, more preferably 0.1% by weight or less, further preferably 0.05% by weight or less, and ideally 0 (zero) based on the total amount of the monomer components constituting the (meth) acrylic base polymer. With such a configuration, the acid content in the photocurable adhesive can be preferably 100ppm or less, more preferably 70ppm or less, and still more preferably 50ppm or less.
The (meth) acrylic base polymer may also contain a nitrogen-containing monomer as a monomer component. The (meth) acrylic base polymer can form the 3 rd pressure-sensitive adhesive layer having an excellent balance among storage modulus, adhesion retention property and impact resistance by appropriately containing a high-polarity monomer such as a hydroxyl group-containing monomer, a carboxyl group-containing monomer and a nitrogen-containing monomer as a monomer component. The amount of the high-polarity monomer (the total amount of the hydroxyl group-containing monomer, the carboxyl group-containing monomer, and the nitrogen-containing monomer) is preferably 10 to 45% by weight, more preferably 15 to 40% by weight, and still more preferably 18 to 35% by weight, based on the total amount of the monomer components constituting the (meth) acrylic base polymer. It is particularly preferable that the sum of the hydroxyl group-containing monomer and the nitrogen-containing monomer is within the above range. The amount of the nitrogen-containing monomer is preferably 3 to 25% by weight, more preferably 5 to 20% by weight, and still more preferably 7 to 15% by weight, based on the total amount of the monomer components constituting the (meth) acrylic base polymer.
The (meth) acrylic polymer may further contain any suitable monomer component depending on the purpose. Specific examples of such monomer components include: vinyl monomers such as acid anhydride group-containing monomers, (meth) acrylic caprolactone adducts, sulfonic acid group-containing monomers, phosphoric acid group-containing monomers, vinyl acetate, vinyl propionate, styrene, and α -methylstyrene; cyano group-containing acrylic monomers such as acrylonitrile and methacrylonitrile; epoxy group-containing monomers such as glycidyl (meth) acrylate; glycol acrylate monomers such as polyethylene glycol (meth) acrylate, polypropylene glycol (meth) acrylate, methoxy ethylene glycol (meth) acrylate, and methoxy polypropylene glycol (meth) acrylate; acrylic ester monomers such as tetrahydrofurfuryl (meth) acrylate, fluoro (meth) acrylate, silicone (meth) acrylate, and 2-methoxyethyl (meth) acrylate.
The (meth) acrylic base polymer preferably contains at most an alkyl (meth) acrylate as a monomer component, and more preferably contains at most an alkyl (meth) acrylate having a chain alkyl group having 6 or less carbon atoms. With such a constitution, the peak value of tan δ becomes large, and the impact resistance can be improved. The amount of the alkyl (meth) acrylate having a chain alkyl group having 6 or less carbon atoms is preferably 30 to 80% by weight, more preferably 35 to 75% by weight, and still more preferably 40 to 70% by weight, based on the total amount of the monomer components constituting the (meth) acrylic base polymer. The content of butyl acrylate as the monomer component is particularly preferably in the above range.
The glass transition temperature (Tg) of the (meth) acrylic base polymer is preferably-50 ℃ or higher. On the other hand, the Tg of the (meth) acrylic base polymer is preferably-5 ℃ or lower, more preferably-10 ℃ or lower, and still more preferably-15 ℃ or lower.
D-2-2-2. cross-linked structure
The polymer having a crosslinked structure introduced into the (meth) acrylic base polymer can be obtained, for example, by the following method: (1) a method in which a (meth) acrylic polymer having a functional group capable of reacting with a crosslinking agent is polymerized, and then the crosslinking agent is added to react the (meth) acrylic polymer with the crosslinking agent; and (2) a method of introducing a branched structure (crosslinked structure) into a polymer chain by including a polyfunctional compound in a polymerization component of a polymer. These methods may also be used in combination.
Specific examples of the crosslinking agent in the method of reacting a base polymer with a crosslinking agent in the above (1) include: isocyanate crosslinking agent, epoxy crosslinking agent,
Oxazoline crosslinking agents, aziridine crosslinking agents, carbodiimide crosslinking agents, metal chelate crosslinking agents, and the like. Among them, isocyanate-based crosslinking agents and epoxy-based crosslinking agents are preferable because they have high reactivity with hydroxyl groups and carboxyl groups of the base polymer and easily introduce a crosslinked structure. These crosslinking agents react with functional groups such as hydroxyl groups and carboxyl groups introduced into the base polymer to form a crosslinked structure. As mentioned above, the base polymer is provided with an acid-free binder which does not contain carboxyl groupsIn this case, the crosslinked structure is preferably introduced by hydroxyl groups in the base polymer and an isocyanate-based crosslinking agent.
The crosslinking agent may be used in a proportion of preferably 0.03 to 0.5 parts by weight, more preferably 0.05 to 0.3 parts by weight, still more preferably 0.06 to 0.25 parts by weight, particularly preferably 0.07 to 0.2 parts by weight, based on 100 parts by weight of the base polymer. When the amount of the crosslinking agent is in such a range, the gel fraction can be brought to the above-mentioned desired range.
D-2-2-3 polyfunctional compounds
In the method of (2) above in which the polyfunctional compound is included in the polymerization component of the base polymer, the total amount of the monomer component constituting the (meth) acrylic base polymer and the polyfunctional compound for introducing a crosslinked structure may be reacted at once, or the polymerization may be carried out in a plurality of stages. As a method of carrying out the polymerization in a plurality of stages, the following method is preferred: a method of polymerizing (polymerizing by prepolymerization) a monofunctional monomer constituting a (meth) acrylic base polymer to prepare a partial polymer (prepolymer composition), and adding a polyfunctional compound such as a polyfunctional (meth) acrylate to the prepolymer composition to polymerize (polymerize) the prepolymer composition with a polyfunctional monomer. The prepolymer composition is a partial polymer comprising a polymer of low degree of polymerization and unreacted monomers.
By performing the preliminary polymerization of the constituent components of the (meth) acrylic base polymer, the branching points (crosslinking points) formed by the polyfunctional compound can be uniformly introduced into the (meth) acrylic base polymer. Alternatively, the pressure-sensitive adhesive layer may be formed by applying a mixture (pressure-sensitive adhesive composition) of a low-molecular-weight polymer or a partial polymer and an unpolymerized monomer component to a substrate and then carrying out the main polymerization on the substrate. Since an oligomer composition such as a prepolymer composition has low viscosity and excellent coatability, the adhesive layer can be made uniform in thickness while improving productivity of the adhesive layer by the method of coating a pressure-sensitive adhesive composition which is a mixture of a prepolymer composition and a polyfunctional compound and then carrying out the polymerization on a substrate.
Examples of the polyfunctional compound used for introducing the crosslinked structure include compounds containing 2 or more polymerizable functional groups (ethylenically unsaturated groups) having an unsaturated double bond in 1 molecule. Typically, the polyfunctional compound is a photopolymerizable polyfunctional compound. The polyfunctional compound is preferably a polyfunctional (meth) acrylate because it can be easily copolymerized with a monomer component of the (meth) acrylic polymer. In the case where a branched (crosslinked) structure is introduced by active energy ray polymerization (photopolymerization), a polyfunctional (meth) acrylate is preferable.
The molecular weight of the polyfunctional compound is preferably 1500 or less, more preferably 1000 or less. The lower limit of the molecular weight may be, for example, 500. The polyfunctional compound preferably has a functional group equivalent (g/eq) of 50 to 500, more preferably 70 to 300, and still more preferably 80 to 200. With such a configuration, the viscoelasticity of the photocurable adhesive can be appropriately adjusted.
The polyfunctional compound may be used in a proportion of preferably 1 to 6 parts by weight, more preferably 2 to 5 parts by weight, and still more preferably 2.5 to 4 parts by weight, based on 100 parts by weight of the base polymer. If the amount is too small, the adhesion retention of the photocurable adhesive (and consequently the 3 rd adhesive layer) may become insufficient. If the amount is too large, the 3 rd adhesive layer formed may be too hard or may have insufficient impact resistance. In addition, the workability and/or the dimensional stability of the photocurable adhesive may be insufficient.
In one embodiment, the polyfunctional compound may be preferably a compound having 3 or more photopolymerizable functional groups in 1 molecule, and more preferably a (meth) acrylate having 3 or more photopolymerizable functional groups in 1 molecule. By using a photopolymerizable compound having 3 or more functions, the adhesion retention of the photocurable adhesive (as a result, the 3 rd adhesive layer) can be further improved. The 2-functional photopolymerizable compound may be used in combination with the 3-or more-functional photopolymerizable compound. The photopolymerizable compound having 3 or more functions may be used in a proportion of preferably 0.5 to 5 parts by weight, more preferably 1 to 4.5 parts by weight, and still more preferably 2 to 4 parts by weight, based on 100 parts by weight of the base polymer.
D-2-2-4. adhesive composition
The pressure-sensitive adhesive composition (photocurable pressure-sensitive adhesive) may contain, in addition to the base polymer, the crosslinking agent, and the polyfunctional compound, a photopolymerization initiator, an oligomer, a silane coupling agent, and any appropriate additive according to the purpose.
Examples of the photopolymerization initiator include: benzoin ether type photopolymerization initiator, acetophenone type photopolymerization initiator, α -alcohol ketone type photopolymerization initiator, aromatic sulfonyl chloride type photopolymerization initiator, photoactive oxime type photopolymerization initiator, benzoin type photopolymerization initiator, benzil type photopolymerization initiator, benzophenone type photopolymerization initiator, ketal type photopolymerization initiator, thioxanthone type photopolymerization initiator, and acylphosphine oxide type photopolymerization initiator. The photopolymerization initiator may be used alone or in combination of two or more. The content of the photopolymerization initiator in the adhesive composition is preferably 0.01 to 5 parts by weight, more preferably 0.05 to 3 parts by weight, based on 100 parts by weight of the base polymer.
As the oligomer, any suitable oligomer may be used. By using the oligomer, the viscoelasticity (hence, filling property and handling property of the deformed portion) and the adhesion of the photocurable adhesive can be adjusted. The oligomer is preferably a (meth) acrylic oligomer. The (meth) acrylic oligomer may have excellent compatibility with the base polymer.
The weight average molecular weight of the oligomer is preferably about 1000 to 30000, more preferably 1500 to 10000, and further preferably 2000 to 8000. When the weight average molecular weight of the oligomer is in such a range, excellent adhesion and adhesive retention can be achieved.
The Tg of the oligomer is preferably 20 ℃ or higher, more preferably 50 ℃ or higher, still more preferably 80 ℃ or higher, and particularly preferably 100 ℃ or higher. On the other hand, the Tg of the oligomer is preferably 200 ℃ or lower, more preferably 180 ℃ or lower, and still more preferably 160 ℃ or lower. If the Tg of the oligomer is in such a range, a 3 rd adhesive layer having excellent adhesion can be formed.
The content of the oligomer in the adhesive composition is preferably 0.1 to 10 parts by weight, more preferably 0.2 to 5 parts by weight, based on 100 parts by weight of the base polymer. When the oligomer content is in such a range, a 3 rd adhesive layer having excellent adhesion can be formed while maintaining good processability and processing dimensional stability of the photocurable adhesive.
As the silane coupling agent, any suitable silane coupling agent can be used. By using the silane coupling agent, the adhesive strength of the photocurable adhesive can be adjusted. The content of the silane coupling agent in the adhesive composition is preferably 0.01 to 5 parts by weight, more preferably 0.03 to 2 parts by weight, based on 100 parts by weight of the base polymer.
The additives are as described in item C above for the 1 st and 2 nd adhesive layers.
In one embodiment, the adhesive composition (photocurable adhesive) may be provided in the form of an adhesive sheet having a thickness corresponding to the thickness of the 3 rd adhesive layer and having release films temporarily attached to both sides.
Further details regarding the adhesive composition (photocurable adhesive) are described in japanese patent application No. 2018-218422 of the present applicant. The description of this application is incorporated herein by reference.
D-3. non-curable adhesive
As the non-curable adhesive, any suitable non-curable adhesive may be used as long as it has the above-described characteristics. By appropriately adjusting the type, combination, and blending amount of the monomer components, the type, amount, combination, blending amount, and the like of the crosslinking agent, silane coupling agent, and additive, a non-curable adhesive having the desired storage modulus can be obtained (as a result, the 3 rd adhesive layer). Examples of the non-curable adhesive include: the adhesive described in the above item C for the adhesive layers 1 and 2, the adhesive described in Japanese patent application No. 2019-196942 of the present applicant, and the adhesive described in Japanese patent laid-open No. 2016-94569. The disclosures of these applications and publications are incorporated herein by reference.
E. Optical component set
As described in the above item D, the adhesive (adhesive composition) constituting the 3 rd adhesive layer may be provided in the form of an adhesive sheet. In the manufacture of an image display device, the adhesive sheet may be provided in the form of an optical member group together with the 1 st polarizing plate (viewing side polarizing plate). Therefore, such an optical member group is also included in the embodiment of the present invention. In one embodiment, the optical member group may further include a 2 nd polarizing plate (back-side polarizing plate). That is, in the production of the image display device, the adhesive sheet, the 1 st polarizing plate (viewing side polarizing plate), and the 2 nd polarizing plate (back side polarizing plate) may be provided in the form of an optical member group.
Examples
The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. The measurement methods of the characteristics in examples are as follows.
(1) Thickness of
The thickness of 10 μm or less was measured by using an interference film thickness meter (available from Otsuka electronics Co., Ltd., product name "MCPD-3000"). The thickness exceeding 10 μm was measured using a digital micrometer (manufactured by Anritsu GS, product name "KC-351C").
(2) Fraction of gel
The adhesive constituting the 3 rd adhesive layer was crosslinked, and the resulting laminate was immersed in ethyl acetate at 23 ℃ for 7 days, and then determined as the weight fraction (unit: weight%) of insoluble components relative to the sample before immersion.
(3) Storage modulus
For the adhesive constituting the 3 rd adhesive layer, the storage modulus at 60 ℃ was measured based on JIS K7244 using a dynamic viscoelasticity measuring apparatus "ARES" manufactured by Rheometric Scientific corporation.
(4) Shrinkage ratio of heated dimension
The 1 st polarizing plate (visible side polarizing plate) used in examples and comparative examples was cut into a size of 10cm × 10cm to obtain a measurement sample. The measurement sample was heated at 85 ℃ for 24 hours, and the heated dimensional shrinkage in the absorption axis direction of the polarizer was determined from the following equation.
Heat shrinkage (%) of size { (dimension after heating)/(dimension before heating) -1 }. times.100
(5) Size of adhesive void
The state of the cross section of the 1 st pressure-sensitive adhesive layer in the deformed portion of the 1 st polarizing plate (visible-side polarizing plate) used in examples and comparative examples was observed by an optical microscope, and the length of the portion of the pressure-sensitive adhesive layer where the defect from the outer edge to the inner side in the surface direction was largest was measured as the size L (μm) of the pressure-sensitive adhesive void portion.
(6) Air bubble
The image display device counterparts obtained in examples and comparative examples were vacuum-laminated, then autoclave-treated (50 ℃/0.5MPa/15min), and UV-cured (at an illuminance of 150 mW/cm)2Lower, 3000mJ of irradiation amount), the state of the bubble (after vacuum lamination) was observed with the naked eye or an optical microscope. Then, the sample was further subjected to a heat test (85 ℃ C., 24 hours), and the state of the bubble was observed with the naked eye or an optical microscope at the time of taking out (after the heat test), and evaluated according to the following criteria.
5: no air bubbles were present after vacuum lamination and after heat testing
4: no bubbles were present after vacuum lamination and some bubbles were present after heat testing
3: no bubbles after vacuum lamination and a large number of bubbles after heat test
2: some bubbles were present after vacuum lamination and after heat testing
1: a large number of bubbles were present after vacuum lamination and after heat testing
Production example 1: preparation of adhesive constituting adhesive layer No. 1
A monomer mixture containing 99 parts of Butyl Acrylate (BA) and 1 part of 4-hydroxybutyl acrylate (4HBA) was charged into a four-necked flask equipped with a stirrer, a thermometer, a nitrogen inlet, and a condenser. Further, 0.1 part of 2, 2' -azobisisobutyronitrile as a polymerization initiator was fed together with 100 parts by weight of ethyl acetate per 100 parts by weight of the monomer mixture (solid content), nitrogen gas was introduced while slowly stirring to replace nitrogen gas, and then polymerization was carried out for 8 hours while maintaining the liquid temperature in the flask at about 55 ℃. To 100 parts of the solid content of the obtained acrylic polymer solution, 0.3 parts of benzoyl peroxide (trade name: Nyper BMT 40SV, manufactured by Nippon oil & fat Co., Ltd.), 0.2 parts of an isocyanate-based crosslinking agent (trade name: Takenate D110N, manufactured by Mitsui chemical Co., Ltd.), 0.03 parts of a reworkability improver (trade name: SILYL SAT10, manufactured by KANEKA Co., Ltd.), 7 parts of an antistatic agent (trade name: LiTFSi30EA, manufactured by Mitsubishi chemical Co., Ltd.), 0.3 parts of an antioxidant (trade name: Irganox 1010, hindered phenol, manufactured by BASF Japan Co., Ltd.), and 0.2 parts of a silane coupling agent (trade name: A-100, manufactured by Kao chemical Co., Ltd., containing an acetoacetylsilane coupling agent) were blended to obtain an adhesive composition a.
Production example 2: preparation of Photocurable adhesive constituting the 3 rd adhesive layer
A monomer mixture containing 65 parts of Butyl Acrylate (BA), 5 parts of cyclohexyl acrylate (CHA), 10 parts of N-vinyl-2-pyrrolidone (NVP), 15 parts of 4-hydroxybutyl acrylate (4HBA) and 5 parts of isostearyl acrylate (ISTA) was fed. Further, 0.2 parts of 2, 2' -azobisisobutyronitrile as a polymerization initiator and 0.065 parts of α -Thioglycerol (TGR) as a chain transfer agent were fed together with 233 parts by weight of ethyl acetate with respect to 100 parts of the monomer mixture (solid content), and stirred for 1 hour in a nitrogen atmosphere at 23 ℃. Then, reacted at 56 ℃ for 5 hours, followed by reaction at 70 ℃ for 3 hours, to prepare a solution of an acrylic base polymer. To the solution of the acrylic base polymer obtained above, the following post-addition components were added to 100 parts of the base polymer and uniformly mixed to prepare a photocurable adhesive b. The storage modulus of the photocurable adhesive b at 60 ℃ before curing was 4.7X 104Pa, storage modulus after curing at 60 DEG CIs 1.0X 105Pa. The gel fraction before curing was 40%, and the gel fraction after curing was 80%.
(post-addition component)
Dipentaerythritol hexaacrylate as polyfunctional compound (light-curing agent): 2 portions of
Polypropylene glycol diacrylate (trade name: APG400, product of shinkamura chemical industries co., ltd., polypropylene glycol #400 (n: 7) diacrylate, functional group equivalent 268g/eq) as a polyfunctional compound (light curing agent): 3 portions of
Photopolymerization initiator (trade name: Irgacure184, manufactured by BASF Co.): 0.2 part
(preparation of adhesive sheet)
A polyethylene terephthalate (PET) film (DIAFOIL MRF75, product of Mitsubishi chemical) having a thickness of 75 μm and a silicone-based release layer provided on the surface thereof was coated with a photocurable adhesive b, heated at 100 ℃ for 3 minutes to remove the solvent, and then the same release PET film as described above was laminated on the surface. The laminate thus obtained was aged at 25 ℃ for 3 days to obtain an adhesive sheet I having release films temporarily attached to both surfaces.
Production example 3: preparation of Photocurable adhesive constituting the 3 rd adhesive layer
A solution of an acrylic base polymer was prepared in the same manner as in production example 2, except that a monomer mixture containing 90 parts of ethylhexyl acrylate (EHA), 5 parts of acrylamide, and 5 parts of hydroxyethyl acrylate (HEA) was used. To the solution of the acrylic base polymer obtained above, the following post-addition components were added to 100 parts of the base polymer and uniformly mixed to prepare a photocurable adhesive c. The storage modulus at 60 ℃ before curing of the photocurable adhesive c was 1.9X 104Pa, storage modulus after curing at 60 ℃ of 4.5X 104Pa. The gel fraction before curing was 0%, and the gel fraction after curing was 75%. The subsequent procedure was the same as in production example 2, and an adhesive sheet II having release films temporarily attached to both surfaces was obtained.
Trimethylolpropane triacrylate as a polyfunctional compound (light-curing agent): 1 part of
Photopolymerization initiator (trade name: Irgacure184, manufactured by BASF Co.): 0.2 part
< example 1 >
1. Production of No. 1 polarizer
As the thermoplastic resin base material, a long-sized amorphous isophthalic acid copolymerized polyethylene terephthalate film (thickness: 100 μm) having a Tg of about 75 ℃ was used. One surface of the resin substrate was subjected to corona treatment.
To 100 parts by weight of a PVA resin obtained by mixing polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl-modified PVA (trade name "GOHSEFIMER Z410" manufactured by Nippon synthetic chemical Co., Ltd.) at a ratio of 9:1, 13 parts by weight of potassium iodide was added to prepare an aqueous PVA solution (coating solution).
The above aqueous PVA solution was applied to the corona-treated surface of the resin substrate, and dried at 60 ℃ to form a PVA-based resin layer having a thickness of 13 μm, thereby producing a laminate.
The resultant laminate was subjected to unidirectional stretching of the free end in the longitudinal direction (longitudinal direction) between rolls having different peripheral speeds in an oven at 130 ℃.
Next, the laminate was immersed in an insolubilization bath (an aqueous boric acid solution in which 4 parts by weight of boric acid was added to 100 parts by weight of water) at a liquid temperature of 40 ℃ for 30 seconds (insolubilization treatment).
Next, the resultant polarizer was immersed for 60 seconds (dyeing treatment) in a dyeing bath (aqueous iodine solution prepared by mixing iodine and potassium iodide in a weight ratio of 1:7 with respect to 100 parts by weight of water) at a liquid temperature of 30 ℃.
Next, the substrate was immersed in a crosslinking bath (aqueous boric acid solution prepared by mixing 3 parts by weight of potassium iodide and 5 parts by weight of boric acid to 100 parts by weight of water) at a liquid temperature of 40 ℃ for 30 seconds (crosslinking treatment).
Then, while immersing the laminate in an aqueous boric acid solution (boric acid concentration 4.0 wt%, potassium iodide 5.0 wt%) having a liquid temperature of 70 ℃, uniaxial stretching was performed between rollers having different peripheral speeds in the longitudinal direction (longitudinal direction) so that the total stretching ratio became 5.5 times (stretching treatment in an aqueous solution).
Then, the laminate was immersed in a cleaning bath (aqueous solution containing 4 parts by weight of potassium iodide per 100 parts by weight of water) at a liquid temperature of 20 ℃ (cleaning treatment).
Then, drying was performed in an oven maintained at 90 ℃ while being brought into contact with a SUS-made heating roller maintained at a surface temperature of 75 ℃ for about 2 seconds (drying shrinkage treatment). The shrinkage in the width direction of the laminate due to the drying shrinkage treatment was 2%.
Thus, the 1 st polarizer having a thickness of 5.0 μm was formed on the resin substrate.
2. Production of No. 1 polarizing plate
An HC-TAC film was bonded to the polarizer surface of the resin substrate/1 st polarizer laminate obtained above via an ultraviolet curable adhesive. The HC-TAC film was a film in which a Hard Coat (HC) layer (thickness 7 μm) was formed on a triacetyl cellulose (TAC) film (thickness 25 μm), and was bonded so that the TAC film was on the polarizer side. Next, the resin substrate was peeled off, and a 1 st pressure-sensitive adhesive layer (thickness 20 μm) was formed on the release surface using the pressure-sensitive adhesive composition a obtained in production example 1, to obtain a polarizing plate having a configuration of an outer protective layer (HC-TAC film)/a 1 st polarizer/a 1 st pressure-sensitive adhesive layer. The polarizing plate was punched to have a length of 148mm and a width of 70mm, and a through-hole having a diameter of 3.9mm was formed in a corner portion. At this time, the polarizer is punched so that the absorption axis direction of the polarizer is the short side direction. Thus, the 1 st polarizing plate (visible-side polarizing plate) a was obtained. The shrinkage ratio of the 1 st polarizing plate in terms of heating dimension was-0.20%, and the size L of the adhesive void was 50 μm. Further, the above adhesive layer had an elastic modulus at 85 ℃ of 5.7X 104Pa。
3. Production of image display device-corresponding product
The 1 st polarizing plate (visible-side polarizing plate) a obtained in the above 2 was bonded to one surface of a glass plate (corresponding to an image display unit) via a 1 st adhesive layer. Next, the adhesive obtained in production example 2 was usedThe release film on one side of sheet I was peeled off, and bonded to a cover Glass (0.8 mm thick, manufactured by Matsunami Glass Co., Ltd.) by means of a roll laminator. Next, the release film on the other side of the adhesive sheet I was peeled off, and the adhesive sheet was vacuum-laminated to adhere to the surface of the 1 st polarizing plate a, and the through-holes were filled with the adhesive sheet. The vacuum lamination conditions were as follows: heated press under 0.2MPa, 60 ℃ (stand-by time 90 seconds), followed by vacuum lamination at 100Pa for 10 seconds. Further, a metal halide lamp (300 mW/cm) was used2) The cumulative quantity of light irradiated from the cover glass side was 3000mJ/cm2The ultraviolet ray of (3) cures the photocurable adhesive. Then, autoclave treatment (50 ℃ C./0.5 MPa/15min) was carried out. As the second polarizing plate (back-side polarizing plate), a commercially available polarizing plate with an adhesive layer was bonded to the other surface of the glass plate by a conventional method. Thus, an image display device counterpart was produced. The obtained image display device-corresponding product was subjected to the evaluation in (6) above. The results are shown in Table 1.
< example 2 >
An image display device-corresponding product was produced in the same manner as in example 1, except that the size L of the adhesive gap portion of the 1 st polarizing plate was set to 100 μm. The obtained image display device-corresponding product was subjected to the same evaluation as in example 1. The results are shown in Table 1.
< example 3 >
An image display device-corresponding product was produced in the same manner as in example 1, except that the thickness of the 1 st pressure-sensitive adhesive layer was set to 15 μm. The obtained image display device-corresponding product was subjected to the same evaluation as in example 1. The results are shown in Table 1.
< example 4 >
An image display device-corresponding product was produced in the same manner as in example 3, except that the size L of the adhesive gap portion of the 1 st polarizing plate was set to 100 μm. The obtained image display device-corresponding product was subjected to the same evaluation as in example 1. The results are shown in Table 1.
< example 5 >
An image display device-corresponding product was produced in the same manner as in example 1, except that the thickness of the 1 st pressure-sensitive adhesive layer was set to 5 μm. The obtained image display device-corresponding product was subjected to the same evaluation as in example 1. The results are shown in Table 1.
< example 6 >
An image display device-corresponding product was produced in the same manner as in example 5, except that the size L of the adhesive gap portion of the 1 st polarizing plate was set to 100 μm. The obtained image display device-corresponding product was subjected to the same evaluation as in example 1. The results are shown in Table 1.
< examples 7 to 12 >
An image display device-corresponding product was produced in the same manner as in examples 1 to 6, except that the adhesive sheet II of production example 3 was used as the 3 rd adhesive layer. The obtained image display device-corresponding product was subjected to the same evaluation as in example 1. The results are shown in Table 1.
< example 13 >
As the 1 st polarizer, a film (thickness 12 μm) obtained by uniaxially stretching a long polyvinyl alcohol (PVA) -based resin film containing iodine along the longitudinal direction (MD direction) was used. A cellulose Triacetate (TAC) film (thickness 25 μm) to be an outer protective layer and an acrylic resin film (thickness 20 μm) to be an inner protective layer were bonded to both sides of the polarizer, and a 1 st adhesive layer (thickness 20 μm) was formed on the surface of the inner protective layer using the adhesive composition a obtained in production example 1, to obtain a polarizing plate having a configuration of outer protective layer (TAC film)/1 st polarizer/inner protective layer (COP film)/1 st adhesive layer. The polarizing plate was punched out in the same manner as in example 1 to form a through-hole. Thus, the 1 st polarizing plate (visible-side polarizing plate) B was obtained. The 1 st polarizing plate was subjected to heat shrinking treatment at 60 ℃ for 12 hours. The 1 st polarizing plate after the heat shrinkage treatment had a heat dimensional shrinkage of-0.50% and the size L of the adhesive void portion was 50 μm.
< examples 14 to 16 >
An image display device-corresponding product was produced in the same manner as in example 13, except that the size L of the adhesive void portion and the composition of the 3 rd adhesive were changed as shown in table 1. The obtained image display device-corresponding product was subjected to the same evaluation as in example 1. The results are shown in Table 1.
< example 17 >
As the polarizing plate 1, a PVA-based resin film (18 μm in thickness) similar to that of example 13 was used. An acrylic resin film (thickness 40 μm) to be an outer protective layer and an acrylic resin film (thickness 40 μm) to be an inner protective layer were bonded to both sides of the polarizer, and a 1 st adhesive layer (thickness 20 μm) was formed on the surface of the inner protective layer using the adhesive composition a obtained in production example 1, to obtain a polarizing plate having a configuration of outer protective layer (acrylic resin film)/1 st polarizer/inner protective layer (acrylic resin film)/1 st adhesive layer. The polarizing plate was punched out in the same manner as in example 1 to form a through-hole. Thus, the 1 st polarizing plate (visible-side polarizing plate) C was obtained. The 1 st polarizing plate was subjected to heat shrinking treatment at 60 ℃ for 12 hours. The 1 st polarizing plate after the heat shrinkage treatment had a heat dimensional shrinkage of-0.60% and the size L of the adhesive void portion was 50 μm.
< examples 18 to 20 >
An image display device-corresponding product was produced in the same manner as in example 17, except that the size L of the adhesive void portion and the composition of the 3 rd adhesive were changed as shown in table 1. The obtained image display device-corresponding product was subjected to the same evaluation as in example 1. The results are shown in Table 1.
< example 21 >
As the polarizing plate 1, a PVA-based resin film (thickness: 12 μm) similar to that of example 13 was used. An HC-TAC film (32 μm thick) was bonded to the surface of the polarizer via an ultraviolet-curable adhesive. Further, a cellulose Triacetate (TAC) film (thickness 25 μm) to be an inner side protective layer was laminated. Then, an alignment fixing layer (thickness 2.5 μm, in-plane retardation Re (550)240nm) of a liquid crystal compound as a λ/2 retardation layer and an alignment fixing layer (thickness 1.5 μm, in-plane retardation Re (550)120nm) of a liquid crystal compound as a λ/4 retardation layer were sequentially transferred onto the surface of the inner protective layer. The transfer was performed so that the angle formed by the absorption axis of the 1 st polarizer and the slow axis of the λ/2 retardation layer was 15 °, and the angle formed by the absorption axis of the 1 st polarizer and the slow axis of the λ/4 retardation layer was 75 °. Each transfer is performed via an adhesive. Further, a 1 st pressure-sensitive adhesive layer (thickness 20 μm) was formed on the surface of the λ/4 retardation layer using the pressure-sensitive adhesive composition a obtained in production example 1, and a polarizing plate having a configuration of outer protective layer (HC-TAC film)/1 st polarizer/inner protective layer (TAC film)/adhesive layer/λ/2 retardation layer/adhesive layer/λ/4 retardation layer/1 st pressure-sensitive adhesive layer was obtained. The polarizing plate was punched out in the same manner as in example 1 to form a through-hole. Thus, the 1 st polarizing plate (visible-side polarizing plate) D was obtained. The 1 st polarizing plate was subjected to heat shrinking treatment at 60 ℃ for 12 hours. The 1 st polarizing plate after the heat shrinkage treatment had a heat dimensional shrinkage of-0.50% and the size L of the adhesive void portion was 50 μm. Using the obtained 1 st polarizing plate, an image display device-corresponding product was produced in the same manner as in example 1, except that a commercially available polarizing plate with an adhesive layer as the 2 nd polarizing plate (back-side polarizing plate) was not bonded to the other surface of the glass plate. The obtained image display device-corresponding product was subjected to the same evaluation as in example 1. The results are shown in Table 1.
< example 22 >
An image display device-corresponding product was produced in the same manner as in example 21, except that the thickness of the cellulose Triacetate (TAC) film to be the inner protective layer was set to 40 μm. The obtained image display device-corresponding product was subjected to the same evaluation as in example 21. The results are shown in Table 1.
< examples 23 to 26 >
As the 1 st adhesive layer, the adhesive obtained in production example 1 was used. An image display device-corresponding product was produced in the same manner as in example 13, except that the 1 st polarizing plate was not subjected to heat shrinkage treatment, and the size L of the adhesive gap portion and the composition of the 3 rd adhesive were changed as shown in table 1. The above adhesive layer 1 had an elastic modulus of 1.1X 10 at 85 deg.C5Pa. The obtained image display device-corresponding product was subjected to the same evaluation as in example 1. The results are shown in Table 1.
< comparative example 1 >
AsThe polarizer 1 used a film (thickness: 22 μm) obtained by uniaxially stretching a long polyvinyl alcohol (PVA) -based resin film containing iodine along the longitudinal direction (MD direction). A TAC film (thickness 60 μm) to be an outer protective layer and an acrylic resin film (thickness 40 μm) to be an inner protective layer were bonded to both sides of the polarizer, and a 1 st adhesive layer (thickness 20 μm) was formed on the surface of the inner protective layer using the adhesive composition a obtained in production example 1, to obtain a polarizing plate having a configuration of outer protective layer (TAC film)/1 st polarizer/inner protective layer (acrylic resin film)/1 st adhesive layer. The polarizing plate was punched out in the same manner as in example 1 to form a through-hole. Thus, the 1 st polarizing plate (visible-side polarizing plate) E was obtained. The 1 st polarizer was subjected to a heat shrinking treatment at 60 ℃ for 12 hours. The 1 st polarizing plate after the heat shrinkage treatment had a heat dimensional shrinkage of-0.90% and the size L of the adhesive void portion was 50 μm. Further, the elastic modulus of the pressure-sensitive adhesive layer at 85 ℃ was 5.7X 104Pa。
< comparative examples 2 to 4 >
An image display device-corresponding product was produced in the same manner as in comparative example 1, except that the size L of the adhesive void portion and the composition of the 3 rd adhesive were changed as shown in table 1. The obtained image display device-corresponding product was subjected to the same evaluation as in example 1. The results are shown in Table 1.
< comparative example 5 >
An image display device-corresponding product was produced in the same manner as in example 13, except that the 1 st polarizing plate was not subjected to heat shrinkage treatment. The obtained image display device-corresponding product was subjected to the same evaluation as in example 1. The results are shown in Table 1.
< comparative examples 6 to 8 >
An image display device-corresponding product was produced in the same manner as in comparative example 5, except that the size L of the adhesive void portion and the composition of the 3 rd adhesive were changed as shown in table 1. The obtained image display device-corresponding product was subjected to the same evaluation as in example 1. The results are shown in Table 1.
< comparative example 9 >
An image display device-corresponding product was produced in the same manner as in example 17, except that the 1 st polarizing plate was not subjected to heat shrinkage treatment. The obtained image display device-corresponding product was subjected to the same evaluation as in example 1. The results are shown in Table 1.
< comparative examples 10 to 12 >
An image display device-corresponding product was produced in the same manner as in comparative example 9, except that the size L of the adhesive void portion and the composition of the 3 rd adhesive were changed as shown in table 1. The obtained image display device-corresponding product was subjected to the same evaluation as in example 1. The results are shown in Table 1.
< comparative example 13 >
An image display device-corresponding product was produced in the same manner as in comparative example 1, except that the 1 st polarizing plate was not subjected to heat shrinkage treatment. The obtained image display device-corresponding product was subjected to the same evaluation as in example 1. The results are shown in Table 1.
< comparative examples 14 to 16 >
An image display device-corresponding product was produced in the same manner as in comparative example 13, except that the size L of the adhesive void portion and the composition of the 3 rd adhesive were changed as shown in table 1. The obtained image display device-corresponding product was subjected to the same evaluation as in example 1. The results are shown in Table 1.
[ Table 1]
Thickness and L in μm
Total thickness of the 1 st polarizer includes a thickness of an adhesive for attaching the polarizer and the protective layer together, and does not include a thickness of the 1 st adhesive layer
< evaluation >
As is clear from table 1, according to the embodiment of the present invention, in the image display device in which the irregularly shaped processed portion is filled with the adhesive, the adhesive filling the irregularly shaped processed portion is made a photocurable adhesive, and the absolute value of the heated dimensional shrinkage rate of the visible-side polarizing plate in the absorption axis direction of the polarizer is controlled to a predetermined value or less, whereby bubbles can be significantly suppressed. Further, by setting the elastic modulus of the 1 st adhesive layer at 85 ℃ to a given range, the dimensional shrinkage of the 1 st polarizing plate can be suppressed.
Industrial applicability
The image display device of the present invention can be suitably used as an image display device having a shaped portion, such as an instrument panel of an automobile, a smart phone, a tablet PC, or a smart watch.
Claims (23)
1. An image display device, comprising:
an image display unit;
a 1 st polarizing plate including a 1 st polarizer and a 1 st adhesive layer, and laminated on a visible side of the image display unit via the 1 st adhesive layer;
a 2 nd polarizing plate including a 2 nd polarizer and a 2 nd adhesive layer and laminated on the back surface side of the image display unit via the 2 nd adhesive layer; and
a 3 rd adhesive layer disposed on the viewing side of the 1 st polarizer,
wherein the 1 st polarizing plate and the 2 nd polarizing plate have irregularly shaped processed parts at positions corresponding to each other, the irregularly shaped processed parts of the 1 st polarizing plate are filled with an adhesive constituting the 3 rd adhesive layer,
when the 3 rd adhesive layer was laminated on the 1 st polarizing plate, the storage modulus at 60 ℃ of the adhesive constituting the 3 rd adhesive layer was 1.0X 105Pa or less.
When this polarizing plate 1 was subjected to a heat treatment at 85 ℃ for 24 hours, the absolute value of the dimensional shrinkage in the absorption axis direction was 0.7% or less.
2. An image display device, comprising:
an image display unit;
a 1 st polarizing plate including a 1 st polarizer and a 1 st adhesive layer, and laminated on a visible side of the image display unit via the 1 st adhesive layer; and
a 3 rd adhesive layer disposed on the viewing side of the 1 st polarizer,
wherein the 1 st polarizing plate has a shaped processed part, the shaped processed part of the 1 st polarizing plate is filled with an adhesive constituting the 3 rd adhesive layer,
when the 3 rd adhesive layer was laminated on the 1 st polarizing plate, the storage modulus at 60 ℃ of the adhesive constituting the 3 rd adhesive layer was 1.0X 105The content of the compound is less than Pa,
when this polarizing plate 1 was subjected to a heat treatment at 85 ℃ for 24 hours, the absolute value of the dimensional shrinkage in the absorption axis direction was 0.7% or less.
3. The image display apparatus according to claim 1 or 2,
the adhesive constituting the 3 rd adhesive layer is a photocurable adhesive,
the photocurable adhesive has a storage modulus of 1.0X 10 at 60 ℃ before curing3Pa～1.0×105Pa, and a storage modulus at 60 ℃ of the photocurable adhesive after curing of 5.0X 103Pa～5.0×105Pa，
The thickness of the No. 3 adhesive layer is 50 to 500 μm.
4. The image display apparatus according to claim 3,
the photocurable adhesive has a gel fraction before curing of 0 to 60% and a gel fraction after curing of 50 to 95%.
5. The image display apparatus according to claim 1 or 2,
the adhesive constituting the 3 rd adhesive layer is a non-curable adhesive, and when the 3 rd adhesive layer is laminated on the 1 st polarizing plate, the storage modulus at 60 ℃ is 1.0X 103Pa～8.0×104Pa，
The thickness of the 3 rd adhesive layer is 50 to 1000 μm.
6. The image display device according to any one of claims 1 to 5,
the 1 st adhesive layer has an elastic modulus of 5.0X 10 at 85 DEG C4Pa or above.
7. The image display device according to any one of claims 1 to 6,
the thickness of the 1 st polarizer is less than 10 μm.
8. The image display device according to any one of claims 1 to 6,
the thickness of the 1 st polarizer is 10 to 20 μm, the thickness of the 1 st polarizer is 100 μm or less, and the 1 st polarizer is subjected to heat shrinkage treatment.
9. The image display device according to any one of claims 1 to 8,
the first polarizing plate 1 has a shaped portion having an adhesive void portion formed by an end face of the first adhesive layer 1 being located on the inner side in the plane direction than an end face of the first polarizing plate 1, and the size of the adhesive void portion is 300 μm or less.
10. The image display device according to any one of claims 1 to 9,
the adhesive strength between the 1 st adhesive layer and the 3 rd adhesive layer is 2N/25mm or more.
11. The image display device according to any one of claims 1 to 10,
the deformed portion includes a through-hole or a cut portion which becomes a concave portion in a plan view.
12. The image display apparatus according to claim 11,
the concave part is a V-shaped notch or a U-shaped notch.
13. The image display device according to any one of claims 1 to 12,
the 3 rd adhesive layer further has a cover glass on the visible side.
14. The image display device according to any one of claims 1 and 3 to 13,
the optical film has a camera portion at a position corresponding to the deformed portions of the 1 st and 2 nd polarizing plates.
15. The image display apparatus according to claim 2,
the 1 st polarizing plate has a camera portion at a position corresponding to the deformed portion of the 1 st polarizing plate.
16. The image display device according to any one of claims 1 and 3 to 15, which is a liquid crystal display device.
17. The image display device according to claim 2, which is an organic EL display device.
18. An optical component set, comprising:
a 1 st polarizing plate disposed on a visible side of the image display unit, the 1 st polarizing plate including a 1 st polarizer and a 1 st adhesive layer, having a shaped portion, and having an absolute value of a dimensional shrinkage rate in an absorption axis direction thereof of 0.7% or less when subjected to a heat treatment at 85 ℃ for 24 hours; and
an adhesive sheet comprising a base and a 3 rd adhesive layer provided on the base, wherein when the 3 rd adhesive layer is laminated on the 1 st polarizing plate, the storage modulus at 60 ℃ of the adhesive constituting the 3 rd adhesive layer is 1.0X 105Pa or less, the adhesive constituting the 3 rd adhesive layer fills the irregularly shaped processed portion of the 1 st polarizing plate.
19. Set of optical components according to claim 18,
the adhesive constituting the 3 rd adhesive layer is a photocurable adhesive,
the photocurable adhesive has a storage modulus of 1.0X 10 at 60 ℃ before curing3Pa～1.0×105Pa, and a storage modulus at 60 ℃ of the photocurable adhesive after curing of 5.0X 103Pa～5.0×105Pa，
The thickness of the No. 3 adhesive layer is 50 to 500 μm.
20. Set of optical components according to claim 19,
the photocurable adhesive has a gel fraction before curing of 0 to 60% and a gel fraction after curing of 50 to 95%.
21. Set of optical components according to claim 18,
the adhesive constituting the 3 rd adhesive layer is a non-curable adhesive, and when the 3 rd adhesive layer is laminated on the 1 st polarizing plate, the storage modulus at 60 ℃ is 1.0X 103Pa～8.0×104Pa，
The thickness of the 3 rd adhesive layer is 50 μm to 1000 μm.
22. Set of optical components according to one of claims 18 to 21, wherein,
the first polarizing plate 1 has a shaped portion having an adhesive void portion formed by an end face of the first adhesive layer 1 being located on the inner side in the plane direction than an end face of the first polarizing plate 1, and the size of the adhesive void portion is 300 μm or less.
23. The optical member set according to any one of claims 18 to 22, further comprising a 2 nd polarizing plate disposed on a back surface side of the image display unit, the 2 nd polarizing plate including a 2 nd polarizer and having an odd-shaped processed portion, the 1 st polarizing plate and the 2 nd polarizing plate having the odd-shaped processed portion at positions corresponding to each other.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-231664 | 2019-12-23 | ||
| JP2019231664 | 2019-12-23 | ||
| JP2020114088A JP2021099474A (en) | 2019-12-23 | 2020-07-01 | Set of image display device and optical member |
| JP2020-114088 | 2020-07-01 | ||
| PCT/JP2020/038467 WO2021131237A1 (en) | 2019-12-23 | 2020-10-12 | Image display device and set of optical members |
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| Publication Number | Publication Date |
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| CN114641711A true CN114641711A (en) | 2022-06-17 |
| CN114641711B CN114641711B (en) | 2023-12-05 |
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| JP (1) | JP2021099474A (en) |
| KR (1) | KR20220119010A (en) |
| CN (1) | CN114641711B (en) |
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| WO (1) | WO2021131237A1 (en) |
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| WO2023054218A1 (en) * | 2021-09-28 | 2023-04-06 | 三菱ケミカル株式会社 | Actinic-ray-curable pressure-sensitive adhesive sheet, pressure-sensitive adhesive sheet laminate with release film, laminate for constituting image display device, image display device, and method for producing laminate for constituting image display device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006126585A (en) * | 2004-10-29 | 2006-05-18 | Fuji Photo Film Co Ltd | Polarizing plate with adhesive and liquid crystal display |
| JP2007316603A (en) * | 2006-04-28 | 2007-12-06 | Sumitomo Chemical Co Ltd | Composite polarizing plate and liquid crystal display device using the same |
| JP2009237037A (en) * | 2008-03-26 | 2009-10-15 | Sumitomo Chemical Co Ltd | Glass substrate having optical film stuck thereto |
| JP2012007046A (en) * | 2010-06-23 | 2012-01-12 | Nitto Denko Corp | Optical laminated sheet, method of manufacturing optical laminated sheet, light source with optical laminated sheet, and image display device with optical laminated sheet |
| CN109407198A (en) * | 2018-12-19 | 2019-03-01 | 武汉华星光电技术有限公司 | Polaroid and display panel |
| CN109637378A (en) * | 2019-01-31 | 2019-04-16 | 厦门天马微电子有限公司 | Display device and preparation method thereof |
| CN110133902A (en) * | 2019-04-29 | 2019-08-16 | 武汉华星光电技术有限公司 | Display device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016071347A (en) * | 2014-09-29 | 2016-05-09 | 住友化学株式会社 | Polarizing plate |
| JP6538332B2 (en) | 2014-11-17 | 2019-07-03 | 日東電工株式会社 | Optical double-sided adhesive sheet |
| JP6837282B2 (en) * | 2016-01-25 | 2021-03-03 | リンテック株式会社 | Optical film with adhesive layer |
| SG11201810445TA (en) * | 2016-06-14 | 2018-12-28 | Nitto Denko Corp | Double-sided pressure-sensitive-adhesive-layer-attached polarizing film, and image display device |
| JP2018159911A (en) * | 2017-01-27 | 2018-10-11 | 住友化学株式会社 | Polarizing plate and image display device |
| US10991774B2 (en) * | 2018-02-12 | 2021-04-27 | Samsung Display Co., Ltd. | Display device and method for fabricating the same |
| JP2019215573A (en) * | 2019-08-28 | 2019-12-19 | 日東電工株式会社 | Polarizing film with adhesive layer and image display device |
-
2020
- 2020-07-01 JP JP2020114088A patent/JP2021099474A/en active Pending
- 2020-10-12 CN CN202080074267.9A patent/CN114641711B/en active Active
- 2020-10-12 WO PCT/JP2020/038467 patent/WO2021131237A1/en active Application Filing
- 2020-10-12 KR KR1020227017392A patent/KR20220119010A/en unknown
- 2020-10-20 TW TW109136321A patent/TW202124631A/en unknown
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006126585A (en) * | 2004-10-29 | 2006-05-18 | Fuji Photo Film Co Ltd | Polarizing plate with adhesive and liquid crystal display |
| JP2007316603A (en) * | 2006-04-28 | 2007-12-06 | Sumitomo Chemical Co Ltd | Composite polarizing plate and liquid crystal display device using the same |
| JP2009237037A (en) * | 2008-03-26 | 2009-10-15 | Sumitomo Chemical Co Ltd | Glass substrate having optical film stuck thereto |
| JP2012007046A (en) * | 2010-06-23 | 2012-01-12 | Nitto Denko Corp | Optical laminated sheet, method of manufacturing optical laminated sheet, light source with optical laminated sheet, and image display device with optical laminated sheet |
| CN109407198A (en) * | 2018-12-19 | 2019-03-01 | 武汉华星光电技术有限公司 | Polaroid and display panel |
| CN109637378A (en) * | 2019-01-31 | 2019-04-16 | 厦门天马微电子有限公司 | Display device and preparation method thereof |
| CN110133902A (en) * | 2019-04-29 | 2019-08-16 | 武汉华星光电技术有限公司 | Display device |
Also Published As
| Publication number | Publication date |
|---|---|
| TW202124631A (en) | 2021-07-01 |
| CN114641711B (en) | 2023-12-05 |
| WO2021131237A1 (en) | 2021-07-01 |
| JP2021099474A (en) | 2021-07-01 |
| KR20220119010A (en) | 2022-08-26 |
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