CN115023635A - Method for manufacturing optical laminate and display device - Google Patents
Method for manufacturing optical laminate and display device Download PDFInfo
- Publication number
- CN115023635A CN115023635A CN202080095081.1A CN202080095081A CN115023635A CN 115023635 A CN115023635 A CN 115023635A CN 202080095081 A CN202080095081 A CN 202080095081A CN 115023635 A CN115023635 A CN 115023635A
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- China
- Prior art keywords
- film
- adhesive layer
- layer
- sensitive adhesive
- laminate
- Prior art date
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Images
Classifications
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/87—Passivation; Containers; Encapsulations
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- H10K59/8722—Peripheral sealing arrangements, e.g. adhesives, sealants
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- 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]
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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- G02B5/30—Polarising elements
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- 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
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- 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
-
- 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
- H10K59/50—OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
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- 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
- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
-
- 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)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mathematical Physics (AREA)
- Organic Chemistry (AREA)
- Polarising Elements (AREA)
- Laminated Bodies (AREA)
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Liquid Crystal (AREA)
Abstract
The invention provides an optical laminate, which can inhibit the stripping of a surface protection film arranged on the surface opposite to a release film when stripping the release film attached on the surface of a pressure-sensitive adhesive layer for bonding the optical laminate. The optical laminate comprises a polarizing laminate, a first pressure-sensitive adhesive layer laminated on a first surface of the polarizing laminate, a first base material film laminated on a surface of the first pressure-sensitive adhesive layer on the side opposite to the polarizing laminate, a second pressure-sensitive adhesive layer laminated on a second surface of the polarizing laminate, and a second base material film laminated on a surface of the second pressure-sensitive adhesive layer on the side opposite to the polarizing laminate, and satisfies the following expression (1 a). (A/B). times.C.gtoreq.800 (1 a).
Description
Technical Field
The present invention relates to a method for manufacturing an optical laminate and a display device.
Background
Jp 2010-188550 a (patent document 1) discloses a roll in which an optical film is wound, the optical film having a first base film provided on a first surface via a first pressure-sensitive adhesive layer and a second base film provided on a second surface via a second pressure-sensitive adhesive layer. The optical film is cut into a predetermined shape, and then bonded to the display substrate via the first adhesive layer exposed by peeling off the first base film.
Documents of the prior art
Patent document
Patent document 1: japanese patent application laid-open No. 2010-188550
Disclosure of Invention
Patent document 1 describes that the magnitude relationship of the adhesive force at the interface is adjusted in order to suppress the occurrence of floating between the base film and the optical film in a wound state.
The purpose of the present invention is to provide an optical laminate, and a method for manufacturing a display device using the optical laminate, wherein, when a release film attached to the surface of a pressure-sensitive adhesive layer for bonding the optical laminate is peeled, the peeling of a surface protection film provided on the surface on the side opposite to the release film is suppressed.
The present invention provides the following methods for manufacturing an optical laminate and a display device.
[ 1] an optical laminate comprising: a polarizing laminate, a first pressure-sensitive adhesive layer laminated on a first surface of the polarizing laminate, a first base material film laminated on a surface of the first pressure-sensitive adhesive layer on a side opposite to the polarizing laminate, a second pressure-sensitive adhesive layer laminated on a second surface of the polarizing laminate, and a second base material film laminated on a surface of the second pressure-sensitive adhesive layer on a side opposite to the polarizing laminate,
satisfies the following expression (1 a).
(A/B)×C≥800 (1a)
[ in the formula (1a),
a is a value calculated from A1/A2 when the 180 DEG peeling force between the polarizing laminate and the second adhesive layer is A1[ gf/25mm ], and the total thickness of the second base material film and the second adhesive layer is A2[ mu ] m,
b is a value calculated from B1/B2, where B1 gf/25mm is a 180 DEG peel force between the first pressure-sensitive adhesive layer and the first base film, and B2 μm is a thickness of the first base film,
c represents the stiffness [ gurley unit ] of an evaluation laminate in which the first pressure-sensitive adhesive layer, the polarizing laminate, the second pressure-sensitive adhesive layer, and the second base film are laminated in this order. ]
[ 2] the optical laminate according to [ 1], wherein the relationship of the following formula (2a) is further satisfied.
(A/B)×C≤10000 (2a)
[ 3] the optical laminate according to [ 1] or [ 2], wherein A satisfies the following formula (3 a).
0.1≤A≤1 (3a)
[ 4] the optical laminate according to any one of [ 1] to [ 3], wherein B satisfies the following formula (4 a).
0.08≤B≤0.8 (4a)
[ 5] the optical laminate according to any one of [ 1] to [ 4], wherein C satisfies the following formula (5 a).
200≤C≤3000 (5a)
[ 6] A method for manufacturing a display device, comprising the steps of:
a first base film peeling step of peeling the first base film from the optical laminate according to any one of [ 1] to [ 5] to expose a surface of the first pressure-sensitive adhesive layer, and
and a bonding step of bonding the exposed surface of the first pressure-sensitive adhesive layer to a display element.
According to the present invention, it is possible to provide an optical laminate in which peeling of a surface protective film provided on a surface opposite to a release film can be suppressed when peeling the release film attached to a surface of an adhesive layer for bonding an optical laminate, and a method for manufacturing a display device using the optical laminate.
Drawings
Fig. 1 is a schematic cross-sectional view showing an example of an optical laminate of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments. In all the drawings below, the scale of each component is appropriately adjusted to show the component for easy understanding, and the scale of each component shown in the drawings does not necessarily coincide with the scale of the actual component.
[ display device ]
Fig. 1 is a schematic cross-sectional view showing a mode of manufacturing a display device 300 by bonding an optical laminate 100' obtained by peeling a first base material film 22 from an optical laminate 100 to a display element 200.
< optical laminate >
The optical laminate 100 includes a polarizing laminate 10, and includes a first pressure-sensitive adhesive layer 21 laminated on a first surface of the polarizing laminate 10, a first base material film 22 laminated on a surface of the first pressure-sensitive adhesive layer 21 on the side opposite to the polarizing laminate 10, a second pressure-sensitive adhesive layer 31 laminated on a second surface of the polarizing laminate 10, and a second base material film 32 laminated on a surface of the second pressure-sensitive adhesive layer 31 on the side opposite to the polarizing laminate 10.
In the optical laminate 100, the surface of the first pressure-sensitive adhesive layer 21 serves as a bonding surface with the display device 200. The first base material film 22 is a release film (spacer) laminated on the surface of the first pressure-sensitive adhesive layer 21 on the side opposite to the polarizing laminate 10 side. When the optical laminate 100 is bonded to the display element 200, the release film is peeled off from the optical laminate 100. The optical laminate 100' was obtained by peeling the first base material film 22 from the optical laminate 100.
The second base film 32 is laminated on the second surface of the polarizing laminate 10 via the second pressure-sensitive adhesive layer 31, and functions as the surface protection film 30 together with the second pressure-sensitive adhesive layer 31. The surface protection film 30 is usually formed by providing the second pressure-sensitive adhesive layer 31 on the second base film 32 in advance, and the optical laminate 100 is formed by bonding the surface of the second pressure-sensitive adhesive layer 31 of the surface protection film 30 to the polarizing laminate 10. The surface protective film 30 is usually peeled off from the optical laminate 100' after the optical laminate 100 is bonded to the display element 200.
The polarizing laminate 10 includes at least a polarizing plate, and may further include a front panel, a touch sensor panel, and the like. The polarizing plate may include at least a polarizing film, and may further include a protective film, a retardation film, a brightness enhancement film, a laminating layer, and the like.
The thickness of the optical laminate 100 is not particularly limited, and is, for example, 20 to 2000 μm, preferably 30 to 1000 μm, more preferably 50 to 500 μm, and may be 100 μm or more, since it varies depending on the functions required for the optical laminate, the application of the optical laminate, and the like.
The shape of the optical laminate 100 in a plan view may be, for example, a square shape, preferably a square shape having long sides and short sides, and more preferably a rectangle. When the shape of the optical laminate 100 in the plane direction is rectangular, the length of the long side may be, for example, 10mm to 1400mm, and preferably 50mm to 600 mm. The length of the short side is, for example, 5mm to 800mm, preferably 30mm to 500mm, and more preferably 50mm to 300 mm. The layers constituting the optical layered body 100 may be subjected to R processing on the corners, or to notch processing or hole forming on the ends.
The display device 300 is not particularly limited, and examples thereof include an organic electroluminescence (organic EL) display device, an inorganic electroluminescence (inorganic EL) display device, a liquid crystal display device, and an electroluminescence display device. The optical laminate 100 is preferably used for a bendable display device. When the optical laminate 100 is used in an organic EL display device, the polarizing laminate 10 in the optical laminate 100 is preferably a circularly polarizing plate, and reflected light can be suppressed by peeling the first base material film 22 from the optical laminate 100 and then bonding the peeled film to the visible side surface of the organic EL display element. When the optical laminate 100 is used in a liquid crystal display device, the polarizing laminate 10 in the optical laminate 100 is preferably a linear polarizing plate or a circular polarizing plate, and image light can be formed by peeling the first base material film 22 from the optical laminate 100 and then bonding the peeled films to both surfaces of the liquid crystal display device.
The optical laminate 100 preferably satisfies the following expression (1a), and more preferably satisfies the following expression (1 b).
(A/B)×C≥800 (1a)
(A/B)×C≥820 (1b)
The values in the formulae (1a) and (1b) are as follows.
A is a value calculated from a1/a2 when the 180 ° peel force between the polarizing laminate 10 and the second adhesive layer 31 is a1[ gf/25mm ], and the total thickness of the second base material film 32 and the second adhesive layer 31 is a2[ μm ].
B is a value calculated from B1/B2, where B1[ gf/25mm ] is a 180 DEG peel force between the first pressure-sensitive adhesive layer 21 and the first base film 22 and B2[ mu ] m is a thickness of the first base film 22.
C is the stiffness [ Gurley Unit ] of the laminate obtained by laminating the first pressure-sensitive adhesive layer 21, the polarizing laminate 10, the second pressure-sensitive adhesive layer 31, and the second substrate film 32 in this order]. Note that 1mN＝9.807×10 -3 Gurley units.
The respective values were measured by the methods described in the examples section below.
The method for manufacturing a display device using the optical laminate 100 includes a first base film peeling step of peeling the first base film 22 from the optical laminate 100 to expose the surface of the first pressure-sensitive adhesive layer 21. The first substrate film peeling step includes, for example, the following operations: the optical laminate 100 is held by suction from the surface side on which the surface protection film 30 is laminated, a tape is attached to the surface of the first base material film 22, and only the first base material film 22 is peeled off by pulling up the first base material film 22 via the tape. The first base material film peeling step is intended to peel off the first base material film 22, but the surface protection film 30 may be peeled off. If the surface protection film 30 is peeled off, it is difficult to continue the first base film peeling step.
In the first base film peeling step, a method of increasing the adhesion between the surface protective film 30 and the polarizing laminate 10 to increase the peeling force is considered in order to suppress the occurrence of peeling of the surface protective film 30, but if the adhesion of the surface protective film 30 is increased, it may be difficult to cleanly peel the surface protective film 30 in a later step, or defects such as scratches may occur on the surface of the polarizing laminate 10 after peeling.
As a result of intensive studies, the present inventors have found that peeling of the surface protective film 30 in the first base material film peeling step can be suppressed by making the optical laminate 100 satisfy the relationship of the above expression (1 a).
The optical laminate 100 preferably satisfies the following expression (2a), and more preferably satisfies the following expression (2 b).
(A/B)×C≤10000 (2a)
(A/B)×C≤2000 (2b)
By making the optical laminate 100 satisfy the relationship of the above expression (2a), the surface protective film 30 can be easily and cleanly peeled in the first base film peeling step and the surface protective film peeling step of peeling the surface protective film 30 after the bonding step of bonding the optical laminate 100' to the display element 200, and the peeling of the first base film 22 before the first base film peeling step can be suppressed.
In view of enabling the surface protective film 30 to be easily and cleanly peeled off in the surface protective film peeling step, a in the above formula (1a) preferably satisfies the following formula (3a), and more preferably satisfies the following formula (3 b). The value of a can be adjusted by adjusting at least one of the material of the second base film 32, the material of the second pressure-sensitive adhesive layer 31, and the surface treatment of the bonding surface of the polarizing laminate 10 to the second pressure-sensitive adhesive layer 31 to adjust the value of a1, or by adjusting the total thickness a2 of the second base film 32 and the second pressure-sensitive adhesive layer. Examples of the surface treatment of the bonding surface include corona treatment, plasma treatment, and saponification treatment.
0.1≤A≤1 (3a)
0.15≤A≤0.6 (3b)
In view of the fact that the first base film 22 can be easily and cleanly peeled in the first base film peeling step, B in the above formula (1a) preferably satisfies the following formula (4a), and more preferably satisfies the following formula (4B). The value of B can be adjusted by adjusting at least one of the material of the first base film 22, the material of the first pressure-sensitive adhesive layer 21, and the surface treatment of the surface of the first pressure-sensitive adhesive layer 21 to be bonded to the first base film 22, thereby adjusting the value of B1, or by adjusting the thickness B2 of the first base film 22. Examples of the surface treatment of the bonding surface include corona treatment, plasma treatment, and saponification treatment.
0.08≤B≤0.8 (4a)
0.1≤B≤0.4 (4b)
From the viewpoint of suppressing the peeling of the first base material film 22 before the first base material film peeling step and the viewpoint of imparting flexibility to the optical laminate 100' or the polarizing laminate 10, the above-mentioned C in the above-mentioned formula (1a) preferably satisfies the relationship of the following formula (5a), and more preferably satisfies the relationship of the following formula (5 b). By providing the optical laminate 100' or the polarizing laminate 10 with flexibility, a display device having flexibility can be configured. The value of C can be adjusted by adjusting the material of the second base material film 32, the laminated structure of the polarizing laminate 10, and the material and thickness of each layer used in the laminated structure.
200≤C≤3000 (5a)
300≤C≤2000 (5b)
The 180 ° peel force a1 between the polarizing laminate 10 and the second adhesive layer 31 is preferably 10gf/25mm or more, more preferably 14gf/25mm or more, and may be 20gf/25mm or more. The 180 DEG peeling force A1 is preferably 50gf/25mm or less, may be 40gf/25mm or less, and may be 30gf/25mm or less.
The 180 DEG peel force B1 between the first adhesive layer 21 and the first substrate film 22 is preferably 1gf/25mm or more, more preferably 5gf/25mm or more, and may be 6gf/25mm or more. The 180 DEG peeling force B1 is preferably 20gf/25mm or less, may be 15gf/25mm or less, and may be 10gf/25mm or less.
The 180 ° peel force a1 between the polarizing laminate 10 and the second adhesive layer 31 is preferably greater than the 180 ° peel force B1 between the first adhesive layer 21 and the first substrate film 22.
< first adhesive layer 21 >
The first pressure-sensitive adhesive layer 21 is laminated on the first surface of the polarizing laminate 10 in the optical laminate 100, and functions as a bonding layer between the polarizing laminate 10 and the display device. The first pressure-sensitive adhesive layer 21 may be composed of 1 layer or 2 or more layers, but is preferably composed of 1 layer. The first pressure-sensitive adhesive layer 21 may be composed of a pressure-sensitive adhesive composition containing a (meth) acrylic resin, a rubber resin, a urethane resin, an ester resin, a silicone resin, or a polyvinyl ether resin as a main component. Among them, preferred is an adhesive composition containing a (meth) acrylic resin as a base polymer, which is excellent in transparency, weather resistance, heat resistance and the like. The adhesive composition may be of an active energy ray-curable type or a heat-curable type.
As the (meth) acrylic resin (base polymer) used in the adhesive composition, a polymer or copolymer in which 1 or 2 or more kinds of (meth) acrylic esters such as butyl (meth) acrylate, ethyl (meth) acrylate, isooctyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate are used as monomers is preferably used. The base polymer is preferably copolymerized with a polar monomer. Examples of the polar monomer include monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group, and the like, such as a (meth) acrylic acid compound, a 2-hydroxypropyl (meth) acrylate compound, a hydroxyethyl (meth) acrylate compound, a (meth) acrylamide compound, an N, N-dimethylaminoethyl (meth) acrylate compound, and a glycidyl (meth) acrylate compound.
The adhesive composition may contain only the above-mentioned base polymer, but usually further contains a crosslinking agent. Examples of the crosslinking agent include a metal ion having a valence of 2 or more and forming a metal salt of a carboxylic acid with a carboxyl group, a polyamine compound forming an amide bond with a carboxyl group, a polyepoxy compound or polyol forming an ester bond with a carboxyl group, and a polyisocyanate compound forming an amide bond with a carboxyl group. Among them, polyisocyanate compounds are preferable.
The active energy ray-curable adhesive composition has a property of being cured by irradiation with an active energy ray such as an ultraviolet ray or an electron beam, and has a property of being capable of adhering to an adherend such as a film even before irradiation with an active energy ray, and being capable of being cured by irradiation with an active energy ray to adjust the adhesion force. The active energy ray-curable adhesive composition is preferably an ultraviolet-curable adhesive composition. The active energy ray-curable adhesive composition may further contain an active energy ray-polymerizable compound in addition to the base polymer and the crosslinking agent. If necessary, a photopolymerization initiator, a photosensitizer, and the like may be contained.
The binder composition may contain additives such as fine particles, beads (resin beads, glass beads, and the like), glass fibers, resins other than the base polymer, tackifiers, fillers (metal powders, other inorganic powders, and the like), antioxidants, ultraviolet absorbers, dyes, pigments, colorants, antifoaming agents, anticorrosive agents, and photopolymerization initiators for imparting light scattering properties.
The first adhesive layer 21 can be formed by applying an organic solvent diluted solution of the adhesive composition described above to the first surface of the substrate film or the polarizing laminate 10 and drying the applied solution. The base film is generally a thermoplastic resin film, and a typical example thereof is a separation film subjected to a mold release treatment. The separation membrane may be a membrane obtained by subjecting a surface of a membrane made of a resin such as polyethylene terephthalate, polybutylene terephthalate, polycarbonate, or polyarylate on which a pressure-sensitive adhesive layer is to be formed to a mold release treatment such as a silicone treatment.
For example, the first pressure-sensitive adhesive layer 21 may be prepared by using a separation film as the first base film 22, applying a pressure-sensitive adhesive composition directly to the release-treated surface thereof to form a pressure-sensitive adhesive layer, and laminating the pressure-sensitive adhesive layer with the separation film on the first surface of the polarizing laminate 10.
The first pressure-sensitive adhesive layer 21 may be formed by directly applying a pressure-sensitive adhesive composition to the first surface of the polarizing laminate 10 to form a pressure-sensitive adhesive layer, and the separation film may be laminated as the first base film 22 on the outer surface of the first pressure-sensitive adhesive layer 21.
When the adhesive layer is provided on the first surface of the polarizing laminate 10, the bonding surface of the polarizing laminate 10 and/or the bonding surface of the adhesive layer is preferably subjected to a surface activation treatment such as a plasma treatment or a corona treatment, and more preferably subjected to a corona treatment.
Alternatively, an adhesive sheet may be prepared in which the first adhesive layer 21 is formed by applying an adhesive composition to the second release film, the release film (first base film 22) is laminated on the adhesive layer thus formed, and the adhesive layer with the release film may be laminated on the polarizing laminate 10 after the second release film is peeled off from the adhesive sheet. As the second separation film, a film having a weaker adhesion to the first pressure-sensitive adhesive layer 21 than the separation film (first base film 22) and being easily peeled off can be used.
The thickness of the first pressure-sensitive adhesive layer 21 is not particularly limited, and is, for example, preferably 1 μm to 100 μm, more preferably 3 μm to 50 μm, and may be 20 μm or more.
< first substrate film 22 >
The first base material film 22 is a release film (spacer) laminated on the surface of the first pressure-sensitive adhesive layer 21 on the side opposite to the polarizing laminate 10 side. The surface of the first substrate film 22 in contact with the first adhesive layer 21 is preferably subjected to release treatment.
The first substrate film 22 is preferably a thermoplastic resin film. Examples of the thermoplastic resin film include a cyclic polyolefin resin film; cellulose acetate resin films made of resins such as cellulose triacetate and cellulose diacetate; polyester resin films made of resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate; a polycarbonate-based resin film; a (meth) acrylic resin film; polypropylene resin films, and the like. The first substrate film 22 is preferably a polyester resin film, and more preferably a polyethylene terephthalate film.
The thickness B2 of the first substrate film 22 is preferably 15 μm or more, more preferably 20 μm or more, and still more preferably 25 μm or more. The thickness B2 of the first substrate film 22 is preferably 80 μm or less, and more preferably 60 μm or less.
< surface protective film 30 >
The surface protection film 30 is composed of a second base film 32 and a second pressure-sensitive adhesive layer 31 laminated thereon. The surface protection film 30 has a function of protecting the second surface of the polarizing laminate 10, and is peeled from the polarizing laminate 10 after the optical laminate 100' is bonded to the display device 200, for example
The resin constituting the second base film 32 can be applied to the above description relating to the first base film 22.
The adhesive composition constituting the second adhesive layer 31 can be applied to the above description relating to the adhesive composition constituting the first adhesive layer 21. The thickness of the second pressure-sensitive adhesive layer 31 is not particularly limited, and is, for example, preferably 1 μm to 100 μm, more preferably 3 μm to 50 μm, and may be 20 μm or more. Commercially available surface protective films 30 may also be used.
The total thickness a2 of the second substrate film 32 and the second pressure-sensitive adhesive layer 31 is preferably 30 μm or more, more preferably 40 μm or more, and may be 50 μm or more. The total thickness a2 of the second substrate film 32 and the second pressure-sensitive adhesive layer 31 is preferably 200 μm or less, and more preferably 150 μm or less.
< polarizing laminate 10 >
(polarizing plate)
The polarizing laminate 10 includes at least a polarizing plate. The polarizer comprises at least a linear polarizer layer. The polarizing plate is, for example, a circular polarizing plate including at least a retardation layer. Since the circularly polarizing plate can absorb reflected external light in the display device, the optical layered body can be provided with an antireflection function.
The thickness of the polarizing plate is usually 5 μm or more, and may be 20 μm or more, 25 μm or more, and may be 30 μm or more. The thickness of the polarizing plate is preferably 80 μm or less, and more preferably 60 μm or less.
(layer of Linear polarizer)
The linear polarizer layer has a function of selectively transmitting linearly polarized light in a certain direction among unpolarized light rays such as natural light. The linear polarizer layer may include a stretched film or a stretched layer having a dichroic dye adsorbed thereon, a liquid crystal layer containing a cured product of a polymerizable liquid crystal compound and a dichroic dye, in which the dichroic dye is dispersed and oriented in the cured product of the polymerizable liquid crystal compound, and the like. When the pigment is dispersed and oriented in an anisotropic medium, the pigment may look colored in a certain direction and almost colorless in a direction perpendicular to the direction. A dye exhibiting such a phenomenon is referred to as a dichroic dye. A linear polarizer layer using a liquid crystal layer as a polarizer layer is preferable because it is not limited in the bending direction as compared with a stretched film or a stretched layer having a dichroic dye adsorbed thereon.
(polarizer layer as stretched film or stretched layer having dichroic dye adsorbed thereon)
The polarizer layer as a stretched film having a dichroic dye adsorbed thereon can be generally produced through the following steps: the method for producing a polyvinyl alcohol film comprises a step of uniaxially stretching a polyvinyl alcohol resin film, a step of dyeing the polyvinyl alcohol resin film with a dichroic dye such as iodine to adsorb the dichroic dye, a step of treating the polyvinyl alcohol resin film adsorbed with the dichroic dye with an aqueous boric acid solution, and a step of washing the polyvinyl alcohol resin film with water after the treatment with the aqueous boric acid solution.
The thickness of the polarizer layer is usually 30 μm or less, preferably 18 μm or less, and more preferably 15 μm or less. The thin thickness of the polarizer layer is advantageous for the thin film formation of the circular polarizing plate. The thickness of the polarizer layer is usually 1 μm or more, for example, 5 μm or more.
The polyvinyl alcohol resin can be obtained by saponifying a polyvinyl acetate resin. As the polyvinyl acetate-based resin, in addition to polyvinyl acetate which is a homopolymer of vinyl acetate, a copolymer of vinyl acetate and another monomer copolymerizable therewith may be used. Examples of the other monomer copolymerizable with vinyl acetate include unsaturated carboxylic acid compounds, olefin compounds, vinyl ether compounds, unsaturated sulfone compounds, and (meth) acrylamide compounds having an ammonium group.
The saponification degree of the polyvinyl alcohol resin is usually about 85 mol% to 100 mol%, and preferably 98 mol% or more. The polyvinyl alcohol resin may be modified, and polyvinyl formal or polyvinyl acetal modified with aldehydes may be used. The polymerization degree of the polyvinyl alcohol resin is usually 1000 to 10000, preferably 1500 to 5000.
The polarizer layer as the stretched layer having the dichroic dye adsorbed thereon can be produced through the following steps: the method for producing a polarizer comprises a step of applying a coating liquid containing the polyvinyl alcohol resin to a base film, a step of uniaxially stretching the obtained laminate film, a step of dyeing the polyvinyl alcohol resin layer of the uniaxially stretched laminate film with a dichroic dye to allow the layer to adsorb the dichroic dye to form a polarizer layer, a step of treating the film adsorbed with the dichroic dye with an aqueous boric acid solution, and a step of washing the film with water after the treatment with the aqueous boric acid solution. The substrate film used for forming the polarizer layer may be used as a protective layer of the polarizer layer. The substrate film may be peeled off from the polarizer layer as necessary. The material and thickness of the base film may be the same as those of the thermoplastic resin film described later.
The polarizer layer as the stretched film or the stretched layer having the dichroic dye adsorbed thereon may be used as the linear polarizer layer as it is, or may be used as the linear polarizer layer by forming a protective layer on one or both surfaces thereof. As the protective layer, a thermoplastic resin film described later can be used. The thickness of the resulting linear polarizer layer is preferably 2 μm to 40 μm.
Examples of the thermoplastic resin film include cyclic polyolefin resin films; cellulose acetate resin films made of resins such as cellulose triacetate and cellulose diacetate; polyester resin films made of resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate; a polycarbonate resin film; a (meth) acrylic resin film; polypropylene resin films and the like are known in the art. The polarizer layer and the protective layer may be laminated via an adhesive layer described later.
From the viewpoint of thinning, the thickness of the thermoplastic resin film is usually 100 μm or less, preferably 80 μm or less, more preferably 60 μm or less, further preferably 40 μm or less, further preferably 30 μm or less, and usually 5 μm or more, preferably 10 μm or more.
A hard coat layer may be formed on the thermoplastic resin film. The hard coat layer may be formed on one surface or both surfaces of the thermoplastic resin film. By providing the hard coat layer, a thermoplastic resin film having improved hardness and scratch resistance can be produced. The hard coat layer may be formed in the same manner as the hard coat layer formed on the resin film.
(polarizer layer as liquid Crystal layer)
The polymerizable liquid crystal compound used for forming the liquid crystal layer is a compound having a polymerizable reactive group and exhibiting liquid crystallinity. The polymerizable reactive group is a group participating in a polymerization reaction, and is preferably a photopolymerizable reactive group. The photopolymerizable reactive group means a group capable of participating in a polymerization reaction by an active radical, an acid, or the like generated from a photopolymerization initiator. Examples of the photopolymerizable functional group include a vinyl group, a vinyloxy group, a 1-chloroethenyl group, an isopropenyl group, a 4-vinylphenyl group, an acryloyloxy group, a methacryloyloxy group, an oxetanyl group, and an oxetanyl group. Among them, acryloxy, methacryloxy, vinyloxy, oxetanyl and oxetanyl groups are preferable, and acryloxy group is more preferable. The type of the polymerizable liquid crystal compound is not particularly limited, and a rod-like liquid crystal compound, a discotic liquid crystal compound, and a mixture thereof can be used. The liquid crystallinity of the polymerizable liquid crystal compound may be thermotropic liquid crystal or lyotropic liquid crystal, and the phase sequence structure may be nematic liquid crystal or smectic liquid crystal.
The dichroic dye used in the polarizer layer as the liquid crystal layer is preferably a substance having an absorption maximum wavelength (λ MAX) in the range of 300 to 700 nm. Examples of such dichroic dyes include acridine dyes,
Oxazine pigments, cyanine pigments, naphthalene pigments, azo pigments, anthraquinone pigments, and the like, and among them, azo pigments are preferable. Examples of the azo dye include monoazo dyes, disazo dyes, trisazo dyes, tetraazo dyes, and stilbene azo dyes, and disazo dyes and trisazo dyes are preferable. The dichroic dye may be used alone, or 2 or more, preferably 3 or more, may be used in combination. Particularly, 3 or more azo compounds are more preferably combined. A part of the dichroic dye may have a reactive group and may have liquid crystallinity.
The polarizer layer as the liquid crystal layer can be formed, for example, by applying a composition for forming a polarizer layer containing a polymerizable liquid crystal compound and a dichroic dye to an alignment film formed on a base film, and polymerizing and curing the polymerizable liquid crystal compound. The composition for forming a polarizer layer may be applied to a base film to form a coating film, and the coating film may be stretched together with the base film to form a polarizer layer. The substrate film for forming the polarizer layer may be used as a protective layer for the polarizer layer. The material and thickness of the base film may be the same as those of the thermoplastic resin film described above.
Examples of the composition for forming a polarizer layer containing a polymerizable liquid crystal compound and a dichroic dye and the method for producing a polarizer layer using the composition include the methods described in jp 2013-37353 a, jp 2013-33249 a, and jp 2017-83843 a. The composition for forming a polarizer layer may further contain additives such as a solvent, a polymerization initiator, a crosslinking agent, a leveling agent, an antioxidant, a plasticizer, and a sensitizer in addition to the polymerizable liquid crystal compound and the dichroic dye. These components can be used alone in 1 kind, also can be combined with more than 2 kinds.
The polymerization initiator that can be contained in the composition for forming a polarizer layer is a compound that can initiate the polymerization reaction of the polymerizable liquid crystal compound, and a photopolymerization initiator is preferred from the viewpoint that the polymerization reaction can be initiated under a lower temperature condition. Specifically, there may be mentioned photopolymerization initiators capable of generating an active radical or an acid by the action of light, and among them, a photopolymerization initiator capable of generating a radical by the action of light is preferable. The content of the polymerization initiator is preferably 1 to 10 parts by mass, more preferably 3 to 8 parts by mass, based on 100 parts by mass of the total amount of the polymerizable liquid crystal compound. When the amount is within this range, the reaction of the polymerizable group proceeds sufficiently, and the alignment state of the liquid crystal compound is easily stabilized.
The thickness of the polarizer layer as the liquid crystal layer is usually 10 μm or less, preferably 0.5 to 8 μm, and more preferably 1 to 5 μm.
The polarizer layer as the liquid crystal layer may be used as the linear polarizer layer without peeling and removing the base film, or may be used as the linear polarizer layer by peeling and removing the base film from the polarizer layer. The polarizer layer as a liquid crystal layer may be used as a linear polarizer layer by forming a protective layer on one or both surfaces thereof. As the protective layer, the above thermoplastic resin film can be used.
The polarizer layer as a liquid crystal layer may have an overcoat layer on one or both sides thereof. The overcoat layer may be provided for the purpose of protecting the polarizer layer, etc. The overcoat layer can be formed, for example, by coating the material (composition) for forming the overcoat layer on the polarizer layer. Examples of the material constituting the overcoat layer include a photocurable resin and a water-soluble polymer. As a material constituting the overcoat layer, a (meth) acrylic resin, a polyvinyl alcohol resin, or the like can be used.
(retardation layer)
In the circularly polarizing plate, the retardation layer may be 1 layer or 2 or more layers. The retardation layer may have an overcoat layer for protecting the surface thereof, a substrate film for supporting the retardation layer, and the like. The phase difference layer includes a λ/4 layer, and may further include at least any one of a λ/2 layer or a positive C layer. When the retardation layer includes a lambda/2 layer, the lambda/2 layer and the lambda/4 layer are laminated in this order from the linear polarizer layer side. When the retardation layer includes the positive C layer, the λ/4 layer and the positive C layer may be stacked in this order from the linear polarizer layer side, or the positive C layer and the λ/4 layer may be stacked in this order from the linear polarizer layer side. The thickness of the retardation layer is, for example, 0.1 to 10 μm, preferably 0.5 to 8 μm, and more preferably 1 to 6 μm.
The retardation layer may be formed of a resin film exemplified as a material of the protective layer, or may be formed of a layer obtained by curing a polymerizable liquid crystal compound. The retardation layer may further comprise an alignment film. The phase difference layer may have a lamination layer for laminating the λ/4 layer with the λ/2 layer and the positive C layer.
When the retardation layer is formed by curing a polymerizable liquid crystal compound, it can be formed by applying a composition containing a polymerizable liquid crystal compound onto a substrate film and curing the composition. An alignment layer may be formed between the substrate film and the coating layer. The material and thickness of the base film may be the same as those of the thermoplastic resin film described above. The retardation layer may be provided on the optical laminate in a form having an alignment layer and a base film when the retardation layer is formed by curing a polymerizable liquid crystal compound. The retardation layer may be bonded to the linear polarizer layer via a bonding layer.
(laminating layer)
The adhesive layer is a layer composed of an adhesive composition or an adhesive composition. The above description of the adhesive composition constituting the first adhesive layer 21 is applied to the adhesive composition serving as the material of the adhesive layer.
The adhesive composition serving as a material of the adhesive layer may be formed by combining 1 or 2 or more kinds of water-based adhesives, active energy ray-curable adhesives, and the like, for example. Examples of the aqueous adhesive include a polyvinyl alcohol resin aqueous solution and an aqueous two-pack type urethane emulsion adhesive. The active energy ray-curable adhesive is an adhesive that is cured by irradiation with an active energy ray such as ultraviolet ray, and examples thereof include an adhesive containing a polymerizable compound and a photopolymerization initiator, an adhesive containing a photoreactive resin, and an adhesive containing a binder resin and a photoreactive crosslinking agent. Examples of the polymerizable compound include photopolymerizable monomers such as a photocurable epoxy monomer, a photocurable acrylic monomer, and a photocurable urethane monomer, and oligomers derived from these monomers. Examples of the photopolymerization initiator include compounds containing an active species that generates a neutral radical, an anionic radical, a cationic radical, and the like by irradiation with active energy rays such as ultraviolet rays.
The thickness of the adhesive layer may be, for example, 1 μm or more, preferably 1 to 25 μm, more preferably 2 to 15 μm, and still more preferably 2.5 to 5 μm.
(front panel)
The polarizing stack 10 may or may not include a front panel. The material and thickness of the front panel are not limited as long as the front panel is a plate-like body that transmits light, and the front panel may be formed of only 1 layer or 2 or more layers. Examples of the front panel 10 include a resin plate-like body (e.g., a resin plate, a resin sheet, a resin film, etc.), and a glass plate-like body (e.g., a glass plate, a glass film, etc.). The front panel 10 may constitute the outermost surface of the display device.
The thickness of the front plate may be, for example, 10 to 500. mu.m, preferably 30 to 200. mu.m, more preferably 40 to 100. mu.m, and may be 50 μm or more.
When the front panel is a resin plate-like body, the resin plate-like body is not limited as long as light can pass through the resin plate-like body. Examples of the resin constituting the resin plate-like body such as a resin film include films formed of polymers such as cellulose triacetate, cellulose acetate butyrate, ethylene-vinyl acetate copolymer, cellulose propionate, cellulose butyrate, cellulose acetate propionate, polyester, polystyrene, polyamide, polyetherimide, poly (meth) acrylic acid, polyimide, polyethersulfone, polysulfone, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyvinyl acetal, polyetherketone, polyetheretherketone, polyethersulfone, polymethylmethacrylate, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, and polyamideimide. These polymers may be used alone or in combination of 2 or more. From the viewpoint of improving strength and transparency, the resin film is preferably formed of a polymer such as polyimide, polyamide, polyamideimide, or the like.
The front panel is preferably a resin film or a resin film having a hard coat layer on a resin film. The hard coat layer may be formed on one surface of the resin film or on both surfaces. By providing the hard coat layer, a resin film having improved hardness and scratch resistance can be produced. The hard coat layer is a cured layer of, for example, an ultraviolet curable resin. Examples of the ultraviolet curable resin include acrylic resins, silicone resins, polyester resins, polyurethane resins, amide resins, and epoxy resins. The hard coating may contain additives for the purpose of improving strength. The additive is not limited, and may be inorganic fine particles, organic fine particles, or a mixture thereof. When the resin film has hard coat layers on both surfaces thereof, the composition and thickness of each hard coat layer may be the same or different from each other.
When the front plate is a glass plate, a strengthened glass for display is preferably used as the glass plate. The thickness of the glass plate may be, for example, 10 to 1000 μm, or 50 μm or more. By using the glass plate, a front panel having excellent mechanical strength and surface hardness can be constituted.
When the optical laminate 100 is used in a display device, the front panel may have a function (function as a window film) of protecting the front surface (screen) of the display device, a function as a touch sensor, a blue light cut-off function, a viewing angle adjustment function, and the like.
(touch sensor panel)
The polarizing laminate 10 may further include a touch sensor panel. As the polarizing laminate 10 provided with the touch sensor panel, for example, a polarizing laminate having a front panel, a circularly polarizing plate, and a touch sensor in this order is given. The touch sensor panel is not limited as long as it is a panel having a sensor (i.e., a touch sensor) that can detect a touched position. The detection method of the touch sensor is not limited, and examples thereof include a touch sensor panel of a resistive film method, a capacitive coupling method, an optical sensor method, an ultrasonic wave method, an electromagnetic induction coupling method, a surface acoustic wave method, and the like. From the viewpoint of low cost, a touch sensor panel of a resistive film type or a capacitive coupling type is preferably used.
As an example of the resistive touch sensor, there is a touch position detecting circuit including a pair of substrates arranged to face each other, an insulating spacer interposed between the pair of substrates, and a transparent conductive film as a resistive film provided on an inner front surface of each of the substrates. In an image display device provided with a resistive touch sensor, if a surface of a front panel is touched, the opposing resistive films are short-circuited, and a current flows through the resistive films. The touch position detection circuit detects a change in voltage at this time, thereby detecting a touched position.
An example of the capacitive coupling type touch sensor includes a substrate, a position detection transparent electrode provided on the entire surface of the substrate, and a touch position detection circuit. In an image display device provided with a capacitive coupling type touch sensor, if the surface of a front panel is touched, a transparent electrode is grounded at the touched point via the capacitance of a human body. The touch position detection circuit detects the grounding of the transparent electrode, thereby detecting the touched position.
The thickness of the touch sensor panel may be, for example, 5 to 2000 μm, preferably 5 to 100 μm, and more preferably 5 to 50 μm.
The touch sensor panel may be a member in which a pattern of a touch sensor is formed on a substrate film. Examples of the base film are the same as those in the description of the thermoplastic resin film described above. The thickness of the touch sensor pattern may be, for example, 1 μm to 20 μm.
[ method for producing optical laminate ]
The optical laminate 100 can be manufactured by a method including a step of bonding the layers. The optical laminate 100 having the polarizing laminate 10 may be manufactured through a process of forming the polarizing laminate 10 and then providing the adhesive layer on the first surface and the second surface thereof, or may be manufactured through a process of providing the adhesive layer in advance on a precursor having a surface on which the first surface of the polarizing laminate is formed, or providing the adhesive layer in advance on a precursor having a surface on which the second surface of the polarizing laminate is formed, and then laminating the precursors.
[ use of display device ]
The display device can be used for mobile equipment such as smart phones and tablet computers, televisions, digital photo frames, electronic signboards, measuring instruments, office equipment, medical equipment, electronic computers and the like.
Examples
The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.
[ preparation of Components of polarizing laminate ]
(liquid Crystal type polarizing plate having polarizer layer as liquid Crystal layer)
An alignment film was formed by coating the composition for an alignment film on one surface of a TAC film having a thickness of 25 μm, drying and exposing to polarized light. A liquid crystal composition containing a liquid crystal polymerizable compound and a dye is coated on the alignment film and dried. The liquid crystal polarizing plate was obtained by forming a polarizer layer as a liquid crystal layer by curing by ultraviolet irradiation.
(stretched polarizing plate having polarizer layer as stretched layer)
The PVA film was immersed in a solution containing iodine while being uniaxially stretched to be dyed, and then immersed in a solution containing boric acid to be crosslinked and dried, thereby obtaining a polarizer layer. A transparent film made of COP having a thickness of 13 μm was attached to one surface of the polarizer layer with an adhesive to obtain a stretched polarizing plate.
(1/4 wavelength board)
An alignment film composition was coated on one surface of a PET film, and dried and exposed to polarized light to form an alignment film. A liquid crystal composition containing a polymerizable liquid crystal compound is applied to the alignment film and dried. The retardation layer (1/4 wavelength layer) was formed by curing by ultraviolet irradiation, and a 1/4 wavelength plate with a PET film was obtained. A laminate composed of an alignment film and a retardation layer (1/4 wavelength layer) was used as a 1/4 wavelength plate.
(1/2 wavelength plate)
An alignment film was formed by coating one surface of a PET film with the composition for an alignment film, drying, and exposing to polarized light. A liquid crystal composition containing a polymerizable liquid crystal compound is applied to the alignment film and dried. The retardation layer (1/2 wavelength layer) was formed by curing by ultraviolet irradiation, and a 1/2 wavelength plate with a PET film was obtained. A laminate composed of an alignment film and a retardation layer (1/2 wavelength layer) was used as a 1/2 wavelength plate.
(Positive C layer)
The composition for a vertical alignment film was coated on one surface of a PET film, and dried and exposed to light to form an alignment film. A liquid crystal composition containing a polymerizable liquid crystal compound is applied to the alignment film and dried. The positive C layer with the PET film was obtained by forming a retardation layer (positive C layer) by curing by ultraviolet irradiation. A laminate composed of an alignment film and a retardation layer was also used as the positive C layer.
(liquid Crystal type polarizing plate for antireflection)
An 1/4 wavelength plate with a PET film was adhered to the surface of the liquid crystal type polarizer on the non-TAC film side using an adhesive, and then the PET film was peeled off. Further, the positive C retardation layer with the PET film was adhered to the surface of the 1/4 wavelength plate with an adhesive, and then the PET film was peeled off. The adhesive composition was applied to the surface of the positive C layer to form an adhesive layer (first adhesive layer), and a liquid crystal polarizing plate for antireflection (circularly polarizing plate) with an adhesive layer was obtained.
(anti-reflective stretching polarizer)
An 1/2 wavelength plate with a PET film was bonded to the surface of the stretch polarizer on the non-COP film side using an adhesive layer, and then the PET film was peeled off. Further, the 1/4 wavelength plate with the PET film was bonded to the surface of the 1/2 wavelength plate with an adhesive, and then the PET film was peeled off. An adhesive composition was applied to the surface of the 1/4 wavelength plate to form an adhesive layer (first adhesive layer), thereby obtaining an antireflection stretched polarizing plate (circularly polarizing plate) with an adhesive layer.
[ example 1]
The optical laminate of example 1 was produced by bonding a surface protective film a (a polyethylene terephthalate (PET) film with an acrylic pressure-sensitive adhesive layer (second pressure-sensitive adhesive layer), rattan industrial co-Ltd., AY-4212) to the TAC surface of the anti-reflective liquid crystal polarizer with a pressure-sensitive adhesive layer, and bonding a release film F (release-treated thickness 50 μmPET) to the pressure-sensitive adhesive layer surface.
< determination of the respective parameters >
(measurement of 180 ℃ peeling force A1 and thickness of surface protective film A2)
The measurement sample was cut out from the entire structure of the optical laminate of example 1 to a width of 2.5 cm. The release film was peeled off from the cut optical laminate, and the surface of the pressure-sensitive adhesive layer (first pressure-sensitive adhesive layer) was bonded to glass. The glass was fixed to a tensile force measuring apparatus ("AG-1S" manufactured by Shimadzu corporation). A part of the surface protection film a was peeled off and fixed to a jig of a tensile force measuring apparatus. The surface protective film A was peeled at a speed of 3.0m/min at a peel angle of 180 ℃ in an atmosphere of 25 ℃ to measure a peel force A1[ gf/25mm ]. The peeled surface protection film A was measured for thickness A2[ mu ] m using a contact film thickness measuring apparatus ("MS-5C" manufactured by Nikon corporation). Table 1 shows the respective values of the 180 ° peel force a1, the thickness a2 of the surface protective film, and the parameter a calculated from a1/a 2.
(measurement of 180 ℃ peeling force B1 and thickness of Release film B2)
The measurement sample was cut out from the entire structure of the optical laminate of example 1 to a width of 2.5 cm. The surface protective film a was removed from the cut optical laminate, and the surface having the surface protective film a was bonded to glass. The glass was fixed to a tension measuring device ("AG-1S" manufactured by shimadzu corporation), and a part of a release film F (first base film) was peeled off and fixed to a jig of the tension measuring device. The release film F was peeled at a speed of 3.0m/min at a peel angle of 180 ℃ in an atmosphere of 25 ℃ to measure a peel force B1[ gf/25mm ]. The thickness B2[ μm ] of the released release film F was measured by a contact film thickness measuring apparatus ("MS-5C" manufactured by Nikon corporation) in the same manner. Table 1 shows the values of 180 ° peel force B1, thickness B2 of the release film, and parameter B calculated from B1/B2.
(measurement of rigidity C)
A measurement sample having a width of 2.54cm and a length of 8.89cm was cut out from the entire optical laminate of example 1. The release film F was removed from the sample for measurement, and the laminate was evaluated for rigidity C [ Gurley units ] by a rigidity Tester (Gurley, Bending rigidity Tester). The calculated values of the rigidity C and (a/B) × C are shown in table 1.
[ example 2]
The optical laminate of example 2 was produced in the same manner as in example 1 except that a surface protective film B (a PET film with an acrylic pressure-sensitive adhesive layer (second pressure-sensitive adhesive layer), AY-638 manufactured by seudon industries, ltd) was used in place of the surface protective film a, and the parameters were measured.
[ example 3]
An optical laminate of example 3 was produced in the same manner as in example 1 except that a surface protective film C (PET film with an acrylic pressure-sensitive adhesive layer (second pressure-sensitive adhesive layer), AY (75) -638, rattan industrial co.
[ example 4]
The optical laminate of example 4 was produced in the same manner as in example 1 except that a surface protective film D (a film obtained by applying an adhesive composition to PET (second base film) having a thickness of 125 μm to form an acrylic adhesive layer (second adhesive layer) having a thickness of 15 μm) was used in place of the surface protective film a, and the parameters were measured.
[ example 5]
An optical laminate of example 5 was produced in the same manner as in example 1 except that a release film G of PET having a thickness of 38 μm and subjected to release treatment was used instead of the release film F, and the parameters were measured.
[ example 6]
The optical laminate of example 6 was produced in the same manner as in example 3 except that the pressure-sensitive adhesive layer-attached stretch type polarizing plate for antireflection was used instead of the pressure-sensitive adhesive layer-attached liquid crystal type polarizing plate for antireflection, and the parameters were measured.
Comparative example 1
An optical laminate of comparative example 1 was produced in the same manner as in example 1 except that a surface protective film E (a PET film with an acrylic pressure-sensitive adhesive layer (second pressure-sensitive adhesive layer), AY (75) -4212, rattan industries co.
Comparative example 2
An optical laminate of comparative example 2 was produced in the same manner as in example 5 except that a pressure-sensitive adhesive layer-attached stretch type polarizing plate for antireflection was used instead of the pressure-sensitive adhesive layer-attached liquid crystal type polarizing plate for antireflection, and the parameters were measured.
[ evaluation of peeling ]
The optical layered bodies produced in the examples and comparative examples were placed on a suction stage so that the surface protective film was in contact with the surface protective film, and were fixed by suction. The release tape was attached to the corner portion of the release film (first base film), and pulled up from the surface of the optical laminate so that the peel angle was 90 °. The case where the release film was separated from the surface of the pressure-sensitive adhesive layer (first pressure-sensitive adhesive layer) was judged as normal peeling, and the case where the surface protective film was peeled from the surface of the polarizing laminate was judged as peeling failure (reverse peeling). The results are shown in Table 1.
[ Table 1]
Description of the symbols
100. 100' optical laminate, 10 polarizing laminate, 21 first adhesive layer, 22 first substrate film, 30 surface protective film, 31 second adhesive layer, 32 second substrate film, 200 display element, 300 display device.
Claims (6)
1. An optical laminate comprising: a polarizing laminate, a first pressure-sensitive adhesive layer laminated on a first surface of the polarizing laminate, a first base material film laminated on a surface of the first pressure-sensitive adhesive layer on a side opposite to the polarizing laminate, a second pressure-sensitive adhesive layer laminated on a second surface of the polarizing laminate, and a second base material film laminated on a surface of the second pressure-sensitive adhesive layer on a side opposite to the polarizing laminate,
satisfies the following relation (1a),
(A/B)×C≥800 (1a)
in the formula (1a), the reaction mixture is,
a is a value calculated from A1/A2 when the 180 DEG peeling force between the polarizing laminate and the second adhesive layer is A1 and the total thickness of the second base material film and the second adhesive layer is A2, wherein the unit of A1 is gf/25mm, the unit of A2 is μm,
b is a value calculated from B1/B2 when the 180 DEG peel force between the first adhesive layer and the first base film is B1 and the thickness of the first base film is B2, the unit of B1 is gf/25mm, the unit of B2 is μm,
and C is the stiffness of an evaluation laminate in which the first pressure-sensitive adhesive layer, the polarizing laminate, the second pressure-sensitive adhesive layer, and the second substrate film are laminated in this order, the stiffness being expressed in gurley units.
2. The optical laminate according to claim 1, wherein the relationship of the following formula (2a) is further satisfied,
(A/B)×C≤10000 (2a)。
3. the optical laminate according to claim 1 or 2, wherein A satisfies the following formula (3a),
0.1≤A≤1 (3a)。
4. the optical laminate according to any one of claims 1 to 3, wherein B satisfies the following formula (4a),
0.08≤B≤0.8 (4a)。
5. the optical laminate according to any one of claims 1 to 4, wherein C satisfies the following formula (5a),
200≤C≤3000 (5a)。
6. a method for manufacturing a display device includes the steps of:
a first base film peeling step of peeling the first base film from the optical laminate according to any one of claims 1 to 5 to expose a surface of the first pressure-sensitive adhesive layer, and
and a bonding step of bonding the exposed surface of the first adhesive layer to a display element.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020011846A JP7469889B2 (en) | 2020-01-28 | 2020-01-28 | Optical laminate and method for manufacturing display device |
| JP2020-011846 | 2020-01-28 | ||
| PCT/JP2020/047716 WO2021153098A1 (en) | 2020-01-28 | 2020-12-21 | Optical laminate and method for manufacturing display device |
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| CN115023635A true CN115023635A (en) | 2022-09-06 |
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| JP (1) | JP7469889B2 (en) |
| KR (1) | KR102443686B1 (en) |
| CN (1) | CN115023635A (en) |
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| KR102628809B1 (en) * | 2021-10-29 | 2024-01-24 | 동우 화인켐 주식회사 | Optical laminate, and manufacturing method for the same, and smart window including the same, and automobile or windows for buiding using the same |
| KR102633726B1 (en) * | 2021-12-30 | 2024-02-05 | 동우 화인켐 주식회사 | Optical laminate, and manufacturing method for the same, and smart window including the same, and automobile or windows for buiding using the same |
| KR102628859B1 (en) * | 2022-03-17 | 2024-01-24 | 동우 화인켐 주식회사 | Optical laminate, and manufacturing method for the same, and smart window including the same |
| KR102628860B1 (en) * | 2022-06-07 | 2024-01-25 | 동우 화인켐 주식회사 | Optical laminate, and manufacturing method for the same, and smart window including the same |
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| JP4562795B2 (en) | 2009-02-16 | 2010-10-13 | 日東電工株式会社 | Roll material and roll material manufacturing method |
| JP2012053078A (en) * | 2010-08-31 | 2012-03-15 | Sumitomo Chemical Co Ltd | Method for manufacturing polarizing plate |
| KR102257917B1 (en) * | 2014-09-09 | 2021-05-27 | 스미또모 가가꾸 가부시키가이샤 | Polarizing plate and method for producing liquid crystal panel |
| JP6940927B2 (en) * | 2015-06-01 | 2021-09-29 | 日東電工株式会社 | Polarizing film with double-sided adhesive layer and image display device |
| KR101955761B1 (en) * | 2016-06-28 | 2019-03-07 | 삼성에스디아이 주식회사 | Polarizing plate and optical display apparatus comprising the same |
| JP6343057B1 (en) * | 2017-03-31 | 2018-06-13 | 住友化学株式会社 | Polarizing plate with protective film and optical laminate |
| JP2019191551A (en) * | 2017-10-31 | 2019-10-31 | 住友化学株式会社 | Laminate body |
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| TW202128419A (en) | 2021-08-01 |
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| KR20210099095A (en) | 2021-08-11 |
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