CN113613880A - Laminate and display device - Google Patents
Laminate and display device Download PDFInfo
- Publication number
- CN113613880A CN113613880A CN202080023261.9A CN202080023261A CN113613880A CN 113613880 A CN113613880 A CN 113613880A CN 202080023261 A CN202080023261 A CN 202080023261A CN 113613880 A CN113613880 A CN 113613880A
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- Prior art keywords
- layer
- laminate
- film
- adhesive layer
- adhesive
- Prior art date
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- 230000004044 response Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000007127 saponification reaction Methods 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 239000013464 silicone adhesive Substances 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
- 238000010897 surface acoustic wave method Methods 0.000 description 1
- 238000010345 tape casting Methods 0.000 description 1
- 238000001029 thermal curing Methods 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- 239000005341 toughened glass Substances 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
Images
Classifications
-
- 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]
-
- 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
-
- 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
- B32B7/022—Mechanical properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- 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
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- 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
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
-
- 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
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/20—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself
- C09J2301/208—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself the adhesive layer being constituted by at least two or more adjacent or superposed adhesive layers, e.g. multilayer adhesive
-
- 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
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
- Polarising Elements (AREA)
- Adhesive Tapes (AREA)
Abstract
The purpose of the present invention is to provide a laminate that suppresses the occurrence of cracks in a coating layer due to bending, and a display device provided with the laminate. The present invention provides a laminate comprising a1 st protective layer, a1 st adhesive layer, a base material layer, an intervening coating layer, a2 nd adhesive layer, and a2 nd protective layer in this order, wherein the respective layers are in contact with each other, and when a storage modulus at 25 ℃ of the 1 st adhesive layer is G '1 (kpa), a storage modulus at 25 ℃ of the 2 nd adhesive layer is G' 2(kpa), a thickness of the 1 st adhesive layer is a1(μm), and a thickness of the 2 nd adhesive layer is a2(μm), the laminate is formed from the following formulae (1) and (2): the evaluation parameters a1 and a2 represented by a1 ═ G '1/a 1(1) and a2 ═ G' 2/a2(2) satisfy the following formulae (3), (4), and (5): a1+ A2 is less than or equal to 230(3), A2-A1 is more than or equal to 0(4), and A2 is more than or equal to 34 (5).
Description
Technical Field
The present invention relates to a laminate and a display device.
Background
Jp 2018 a-101117 (patent document 1) discloses an image display device in which a transparent film base is bonded to a polarizer via a1 st adhesive sheet, and a front surface transparent member is bonded to the transparent film base via a2 nd adhesive sheet. Japanese patent laid-open publication No. 2018-028573 (patent document 2) discloses a laminate for an image display device comprising a plurality of adhesive layers and an optical film containing a polarizing film.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2018-101117
Patent document 2: japanese patent laid-open publication No. 2018-028573
Disclosure of Invention
In the laminate, in order to achieve reduction in thickness and weight, a method of forming layers constituting the laminate by a thin film coating is employed. However, when a laminate including a coating layer is bent, there is a problem that cracks are likely to occur in the coating layer.
The invention aims to provide a laminated body capable of inhibiting cracks caused by bending in a coating layer and a display device with the laminated body.
The present invention provides a laminate and a display device shown below.
[1] A laminate comprising a1 st protective layer, a1 st adhesive layer, a base material layer, a coating layer interposed therebetween, a2 nd adhesive layer, and a2 nd protective layer in this order,
the layers are in contact with each other,
when the storage modulus at 25 ℃ of the 1 st adhesive layer is G '1 (kpa), the storage modulus at 25 ℃ of the 2 nd adhesive layer is G' 2(kpa), the thickness of the 1 st adhesive layer is a1(μm), and the thickness of the 2 nd adhesive layer is a2(μm), the evaluation parameters a1 and a2 represented by the following formulas (1) and (2) satisfy the following formulas (3), (4), and (5).
A1＝G’1/a1 (1)
A2＝G’2/a2 (2)
A1+A2≤230 (3)
A2-A1≥0 (4)
A2≥34 (5)
[2] The laminate according to [1], wherein the 1 st protective layer contains a window film having a tensile elastic modulus of 4.0GPa or more.
[3] The laminate according to [1] or [2], wherein the 2 nd protective layer comprises a back sheet having a tensile elastic modulus of 4.0GPa or more.
[4] The laminate according to any one of [1] to [3], wherein the interlayer coating layer is composed of 1 or more layers, and each layer has a thickness of 5 μm or less.
[5] The laminate according to any one of [1] to [4], wherein the interlayer coating layer comprises a polarizer layer, a phase difference layer, or a touch sensor panel.
[6] The laminate according to any one of [1] to [5], wherein each of the G '1 and the G' 2 is 10000kPa or less.
[7] A display device comprising the laminate according to any one of [1] to [6 ].
According to the present invention, a laminate in which cracks caused by bending are suppressed from occurring in a coating layer, and a display device including the laminate can be provided.
Drawings
Fig. 1 is a schematic cross-sectional view showing an example of a laminate of the present invention.
FIG. 2 is a schematic sectional view showing a laminate of example 1-1.
FIG. 3 is a schematic sectional view showing a laminate of example 2-1.
Fig. 4 is a schematic view illustrating a method of the bending test.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
< laminate >
Fig. 1 shows a schematic cross-sectional view of a laminate (optical laminate) according to an embodiment of the present invention. The laminate 100 includes a1 st protective layer 10, a1 st adhesive layer 11, a base material layer 15, an interlayer coating layer 12, a2 nd adhesive layer 13, and a2 nd protective layer 14 in this order. The layers are in contact with each other. Hereinafter, the 1 st adhesive layer 11 and the 2 nd adhesive layer 13 may be collectively referred to as an adhesive layer.
The thickness of the laminate 100 is not particularly limited, and is, for example, 30 to 1000 μm, preferably 40 to 500 μm, and more preferably 50 to 300 μm, since it varies depending on the functions required for the laminate, the application of the laminate, and the like.
The shape of the laminate 100 in 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 laminate 100 in the plane direction is rectangular, the length of the long side may be, for example, 10mm to 1400mm, 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 laminate may be subjected to corner rounding, or end cutting or punching.
The laminate 100 can be used for a display device or the like, for example. The display device 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 display device may have a touch panel function.
[ evaluation parameters of adhesive layer ]
In the laminate 100, the evaluation parameters a1 and a2 represented by the following formulas (1) and (2) satisfy the following formulas (3), (4) and (5) when the storage modulus at 25 ℃ of the 1 st pressure-sensitive adhesive layer 11 is G '1 (kpa), the storage modulus at 25 ℃ of the 2 nd pressure-sensitive adhesive layer 13 is G' 2(kpa), the thickness of the 1 st pressure-sensitive adhesive layer 11 is a1(μm), and the thickness of the 2 nd pressure-sensitive adhesive layer 13 is a2(μm).
A1＝G’1/a1 (1)
A2＝G’2/a2 (2)
A1+A2≤230 (3)
A2-A1≥0 (4)
A2≥34 (5)
The storage modulus of the pressure-sensitive adhesive layer and the thickness of the layer can be measured by the measurement methods described in the section of examples described later.
The laminate 100 preferably satisfies the following formula (3').
A1+A2≤130 (3’)
The laminate 100 preferably satisfies the following formula (4').
A2-A1≥100 (4’)
The laminate 100 preferably satisfies the following formula (5').
A2≥60 (5’)
Such a laminate 100 is less likely to crack, i.e., has excellent bendability, with the intermediate coating layer 12 interposed therebetween, even when the 1 st protective layer 10 is bent inward. If a laminate including a coating layer is repeatedly bent, cracks may occur in the coating layer. In the laminate 100, the evaluation parameters a1 and a2 of the 1 st adhesive layer 11 and the 2 nd adhesive layer 13 were respectively such that the higher the storage modulus was, the larger the storage modulus was, and the thinner the layer was, the larger the layer thickness was. That is, the larger a1 and a2, the more the adhesive layer has a tendency to harden, and the smaller a1 and a2, the more the adhesive layer has a tendency to soften. The present inventors have found that, when a laminate is bent, if a coating layer is adjacent to the outside of a relatively hard pressure-sensitive adhesive layer on the basis of the bending axis, the tensile stress of the coating layer increases, and cracks are likely to occur. On the other hand, it was found that when the laminate was bent, if the coating layer was adjacent to the inside of the relatively hard pressure-sensitive adhesive layer on the basis of the bending axis, the tensile stress of the coating layer was reduced, and cracks were less likely to occur. Therefore, it is found that when the 1 st pressure-sensitive adhesive layer 11 and the 2 nd pressure-sensitive adhesive layer 13 satisfy the above-described formulas (3), (4), and (5), the tensile stress of the interlayer coat layer 12 interposed between the 1 st pressure-sensitive adhesive layer 11 and the 2 nd pressure-sensitive adhesive layer 13 is not easily increased, and the occurrence of cracks is suppressed even when the 1 st protective layer is bent inward repeatedly.
In the present specification, the bending includes a bent form in which a curved surface is formed at a bent portion. In the bent form, the bending radius of the inner surface of the bend is not particularly limited. The bending also includes a bent form in which the bending angle of the inner surface is greater than 0 degrees and less than 180 degrees, and a folded form in which the bending radius of the inner surface is approximately zero or the bending angle of the inner surface is 0 degrees.
According to the laminate of the present invention, the cracking resistance of the coating layer can be improved to such an extent that cracking does not occur even when the laminate is repeatedly bent at a bending radius of 1mm for 20 ten thousand or more according to the test method described in the section of examples described later. In the present invention, the cracks generated in the coating layer include cracks generated in the coating layer, peeling between the coating layer and the adhesive layer, and the like.
The 1 st adhesive layer 11 is formed of a1 st adhesive composition, and the 2 nd adhesive layer 13 is formed of a2 nd adhesive composition. Examples of the method for producing the 1 st adhesive composition and the 2 nd adhesive composition so that the evaluation parameters a1 and a2 of the 1 st adhesive layer 11 and the 2 nd adhesive layer 13 satisfy the formulae (3), (4) and (5) include a method for forming an adhesive layer from an adhesive composition described later, a method for changing the kind of a monomer constituting a (meth) acrylic polymer described later, a method for adjusting the molecular weight of a (meth) acrylic polymer, a method for adjusting the thickness of an adhesive layer, and a method for combining these methods.
[1 st adhesive layer ]
When the laminate has a structure in which the pressure-sensitive adhesive layer, the thermoplastic resin film, the coating layer, and the pressure-sensitive adhesive layer are in contact with each other in this order, the pressure-sensitive adhesive layer in contact with the thermoplastic resin film is defined as the 1 st pressure-sensitive adhesive layer 11. The 1 st adhesive layer 11 may be an adhesive layer described below.
The storage modulus G' 1 of the 1 st adhesive layer 11 at a temperature of 25 ℃ is usually 10kPa or more, preferably 30kPa or more. The storage modulus G' 1 at 25 ℃ of the 1 st adhesive layer 11 is usually 10000kPa or less, more preferably 5000kPa or less, and still more preferably 1000kPa or less. The storage modulus of the pressure-sensitive adhesive layer can be measured by the method described in the section of examples described later. If the storage modulus G' 1 is too small, the processability of the laminate tends to be lowered, and for example, the end of the adhesive is peeled off (desizing) from the laminate when cutting is performed, the release film is difficult to peel off, or the laminate is likely to be fouled. If the storage modulus G' 1 is too large, the flexibility of the laminate tends to be lowered.
The thickness a1 of the 1 st adhesive layer 11 may be 1 μm or more, preferably 3 μm or more. The thickness a1 of the 1 st adhesive layer 11 may be 100 μm or less, preferably 50 μm or less.
[2 nd adhesive layer ]
When the laminate has a structure in which the adhesive layer, the thermoplastic resin film, the coating layer, and the adhesive layer are in contact with each other in this order, the adhesive layer in contact with the coating layer is defined as the 2 nd adhesive layer 13. The 2 nd adhesive layer 13 may be the following adhesive layer.
The storage modulus G' 2 of the 2 nd adhesive layer 13 at a temperature of 25 ℃ is usually 10kPa or more, preferably 30kPa or more. The storage modulus G' 2 of the 2 nd adhesive layer 13 at 25 ℃ is usually 10000kPa or less, more preferably 5000kPa or less, and still more preferably 1000kPa or less. The storage modulus of the pressure-sensitive adhesive layer can be measured by the method described in the section of examples described later. If the storage modulus G' 2 is too small, the processability of the laminate tends to be lowered, and for example, the end of the adhesive is peeled off (desized) from the laminate during cutting, the release film is difficult to peel off, or the laminate is likely to be fouled. If the storage modulus G' 2 is too large, the flexibility of the laminate tends to decrease.
The thickness a2 of the 2 nd adhesive layer 13 may be 1 μm or more, preferably 3 μm or more. The thickness a2 of the 2 nd adhesive layer 13 may be 100 μm or less, preferably 50 μm or less.
[ sandwiching coating ]
When the laminate has a structure in which the pressure-sensitive adhesive layer, the thermoplastic resin film, the coating layer, and the pressure-sensitive adhesive layer are in contact with each other in this order, the coating layer interposed between the 1 st pressure-sensitive adhesive layer 11 and the 2 nd pressure-sensitive adhesive layer 13 is referred to as an interposed coating layer 12. The coating layer is a layer other than the adhesive layer formed by a step of applying the coating liquid. The interlayer coating 12 may contain a polarizer layer, a phase difference layer, a touch sensor panel, an adhesive layer, or a colored layer, preferably contains the following polarizer layer, phase difference layer, or touch sensor panel, and more preferably contains the polarizer layer or phase difference layer. The colored layer may be a layer that shields wiring or the like disposed in the non-display region of the image display device. By disposing the colored layer at the peripheral edge portion of the laminate, light leakage can be suppressed, and the colored layer can be recognized like a frame, so that design can be improved.
The coating method includes a coating method, a printing method, an evaporation method, and the like. Examples of the coating method include a bar coating method, a knife coating method, a blade coating method, a die coating method, a direct gravure coating method, a reverse gravure coating method, a roll coating method, a CAP coating method, a spin coating method, a spray coating method, a screen coating method, a slit coating method, and a dip coating method. Examples of the printing method include an offset printing method, a gravure printing method, a screen printing method, and an inkjet printing method. Examples of the vapor deposition method include sputtering, Physical Vapor Deposition (PVD), Chemical Vapor Deposition (CVD), plasma CVD (pecvd), and the like.
The interlayer coating 12 is composed of 1 or more layers. The thickness of each layer is usually 5 μm or less. The thickness of each layer is usually 0.01 μm or more. The thickness of the interlayer coating layer 12 is preferably 1 μm to 20 μm, and may be 10 μm or less. When the interlayer coating 12 includes a polarizer layer, the thickness of the interlayer coating 12 is, for example, 1 μm to 15 μm. When the interlayer coating 12 includes a retardation layer, the thickness of the interlayer coating 12 is, for example, 1 μm to 8 μm. When the interlayer coating 12 includes a touch sensor panel, the thickness of the interlayer coating 12 is, for example, 15 μm or less.
[ base Material layer ]
When the laminate has a structure in which the pressure-sensitive adhesive layer, the thermoplastic resin film, the coating layer, and the pressure-sensitive adhesive layer are in contact with each other in this order, the thermoplastic resin film located between the 1 st pressure-sensitive adhesive layer 11 and the 2 nd pressure-sensitive adhesive layer 13 is used as the base layer 15. The base material layer 15 is generally a base material coated with the above-described coating liquid. The base material layer 15 may be a base material film described below.
[ first protective layer ]
The entire structure portion which is a part of the laminate, is in contact with the 1 st adhesive layer 11, and is present on the side opposite to the base material layer 15 side is referred to as the 1 st protective layer 10. When a plurality of layers are present on the side opposite to the base material layer 15 side with the 1 st pressure-sensitive adhesive layer 11 interposed therebetween, all of them are defined as the 1 st protective layer 10. The 1 st protective layer 10 may include 1 or more of a front panel, a base film, an adhesive layer, a polarizer layer, a retardation layer, a touch sensor panel, a bonding layer, a back panel, and the like described below. The 1 st protective layer 10 preferably comprises a front panel.
[ second protective layer ]
The entire structure portion which is a part of the laminate, is in contact with the 2 nd pressure-sensitive adhesive layer 13, and is present on the opposite side to the side where the coat layer 12 is interposed is referred to as the 2 nd protective layer 14. When a plurality of layers are present on the opposite side of the 2 nd adhesive layer 13 from the side where the overcoat layer 12 is interposed, all of them are referred to as the 2 nd protective layer 14. The 2 nd protective layer 14 may include 1 or more of a base film, an adhesive layer, a polarizer layer, a retardation layer, a touch sensor panel, a bonding layer, a back surface plate, and the like described below. The 2 nd protective layer 14 preferably comprises a back panel.
When a plurality of adhesive layers, thermoplastic resin films, coating layers, and adhesive layers are present in this order and in contact with each other in the laminate, the 1 st protective layer 10, the 1 st adhesive layer 11, the base material layer 15, the intervening coating layer 12, the 2 nd adhesive layer 13, and the 2 nd protective layer 14 can be identified by a plurality of modes. For example, when the laminate 100 is composed of a front sheet/adhesive layer I/substrate film I/coating layer I/adhesive layer II/substrate film II/coating layer II/adhesive layer III/back sheet ("/" indicates adjacent layer contact, the same applies hereinafter), the 1 st protective layer 10, the 1 st adhesive layer 11, the interposed coating layer 12, the 2 nd adhesive layer 13, and the 2 nd protective layer 14 can be identified in two modes. That is, the 1 st protective layer 10 is a front panel, the 1 st pressure-sensitive adhesive layer 11 is a pressure-sensitive adhesive layer I, the base layer 15 is a base film I, the intermediate coat layer 12 is a coat layer I, the 2 nd pressure-sensitive adhesive layer 13 is a pressure-sensitive adhesive layer II, and the 2 nd protective layer 14 is a base film II/coat layer II/pressure-sensitive adhesive layer III/rear panel. On the other hand, the 1 st protective layer 10 may be defined as a front panel, a pressure-sensitive adhesive layer I, a base film I, a coating layer I, a pressure-sensitive adhesive layer II, a base layer 15, a coating layer II, an interlayer coating layer 12, a pressure-sensitive adhesive layer III, a2 nd protective layer 14, a pressure-sensitive adhesive layer II, a base film II, a coating layer III, and a base film II. In such a case, in both the evaluation modes, when the laminate in which the evaluation parameters a1 and a2 satisfy the above-described formulas (3), (4), and (5) is bent with the first protective layer being inside, the generation of cracks in the coating layer is suppressed.
The following describes layers that can constitute the laminate 100.
(front panel)
The front panel is not limited to a material and a thickness as long as it is a plate-like body capable of transmitting light, and may be composed of only 1 layer, or 2 or more layers. Examples thereof include a plate-like body made of resin (for example, a resin plate, a resin sheet, a resin film, etc.), a plate-like body made of glass (for example, a glass plate, a glass film, etc.), and a touch sensor panel described later. The front panel can constitute the outermost surface of the display device.
The thickness of the front plate may be, for example, 10 to 1000. mu.m, preferably 20 to 500. mu.m, and more preferably 30 to 300. mu.m. In the present invention, the thickness of each layer can be measured by the thickness measurement method described in the examples described below.
When the front panel is a resin plate-like body, the resin plate-like body is not limited as long as it can transmit light. Examples of the resin constituting the plate-like body made of a resin such as a resin film include films made of polymers such as triacetyl cellulose, acetyl cellulose butyrate, ethylene-vinyl acetate copolymer, propionyl cellulose, butyryl cellulose, acetyl propionyl cellulose, 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 the above 2 kinds. From the viewpoint of improving strength and transparency, a resin film made of a polymer such as polyimide, polyamide, polyamideimide, or the like is preferable.
From the viewpoint of hardness, the front panel is preferably a film in which a hard coat layer is provided on at least one surface of a base film. As the base film, a film formed of the above resin can be used. The hard coat layer may be formed on one surface of the substrate 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, urethane resins, amide resins, and epoxy resins. To increase hardness, the hard coating may contain additives. The additive is not limited, and examples thereof include inorganic fine particles, organic fine particles, and a mixture thereof.
When the front plate is a glass plate, a tempered 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 to 500 μm. By using the glass plate, a front panel having excellent mechanical strength and surface hardness can be constituted.
When the laminate 100 is used in a display device, the front panel may have a function of protecting the front surface (screen) of the display device (a function as a window film), a function as a touch sensor, a blue light cut-off function, a viewing angle adjustment function, and the like.
From the viewpoint of facilitating the construction of the laminate 100 having excellent bendability, the tensile elastic modulus of the front panel at a temperature of 23 ℃ is preferably 4.0GPa or more, and more preferably 5.0GPa or more. From the viewpoint of facilitating the construction of the laminate 100 having excellent bendability, the tensile elastic modulus of the front panel at a temperature of 23 ℃ is preferably 20GPa or less, and more preferably 15GPa or less. The tensile modulus can be measured by the test method described in the following section of examples.
(substrate film)
The substrate film may be composed of a resin film, for example, and preferably a transparent resin film. The resin film may be a long roll-shaped resin film or a single sheet-shaped resin film. From the viewpoint of continuous production, a long roll-shaped resin film is preferable.
Examples of the resin constituting the resin film include polyolefins such as polyethylene, polypropylene, norbornene polymers, and cycloolefin resins; polyvinyl alcohol; polyethylene terephthalate; polymethacrylates; a polyacrylate; cellulose esters such as triacetyl cellulose, diacetyl cellulose, and cellulose acetate propionate; polyethylene naphthalate; a polycarbonate; polysulfones; polyether sulfone; a polyether ketone; polyphenylene sulfide; polyphenylene ether; a polyamide; a polyimide; polyamide-imide, and the like. Among them, cyclic olefin resins, cellulose esters, and polyimides are preferable.
From the viewpoint of making the laminate 100 thinner, the thickness of the resin film is preferably thin, but if it is too thin, it tends to be difficult to ensure impact resistance. The thickness of the resin film may be, for example, 10 to 200. mu.m, preferably 15 to 150. mu.m, and more preferably 20 to 100. mu.m.
A coating may be formed on the substrate film. The substrate film may have a hard coat layer, an antireflection layer, or an antistatic layer on at least one surface. The substrate film may have a hard coat layer, an antireflection layer, an antistatic layer, and the like formed only on the surface of the side on which the coating layer is not formed. The base material film may have a hard coat layer, an antireflection layer, an antistatic layer, and the like formed only on the surface on the side on which the coating layer is formed. The substrate film may include an adhesive layer for adhering to other layers.
(adhesive layer)
The pressure-sensitive adhesive layer is a layer which is interposed between 2 layers and bonded to each other, and may be, for example, a layer formed of a pressure-sensitive adhesive or an adhesive or a layer obtained by subjecting the layer to some treatment. Adhesives are also known as pressure sensitive adhesives. The "adhesive" in the present specification means an adhesive other than an adhesive (pressure-sensitive adhesive), and is clearly distinguished from an adhesive. The pressure-sensitive adhesive layer may be 1 layer or 2 or more layers, and preferably 1 layer. The adhesive layer may be formed of an adhesive composition.
The pressure-sensitive adhesive layer may be composed of a pressure-sensitive adhesive composition containing a resin such as a (meth) acrylic, rubber, urethane, ester, silicone, or polyvinyl ether resin as a main component. Among these, 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 an active energy ray-curable type or a thermosetting type.
As the (meth) acrylic resin (base polymer) used in the adhesive composition, for example, 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 can be preferably used. The base polymer preferably copolymerizes polar monomers. 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 (meth) acrylic acid, 2-hydroxypropyl (meth) acrylate, hydroxyethyl (meth) acrylate, (meth) acrylamide, N-dimethylaminoethyl (meth) acrylate, and glycidyl (meth) acrylate.
The adhesive composition may comprise only the above-mentioned base polymer, but usually further contains a crosslinking agent. Examples of the crosslinking agent include metal ions having a valence of 2 or more and a metal carboxylate salt with a carboxyl group; a substance which is a polyamine compound and forms an amide bond with a carboxyl group; a substance which is a polyepoxy compound or a polyhydric alcohol and forms an ester bond with a carboxyl group; a polyisocyanate compound and forms an amide bond with a carboxyl group. Among them, polyisocyanate compounds are preferable.
The active energy ray-curable adhesive composition refers to the following adhesive composition: the adhesive sheet has a property of being cured by irradiation with an active energy ray such as an ultraviolet ray or an electron beam, and also has a property of having adhesiveness before irradiation with an active energy ray so as to be capable of being adhered to an adherend such as a film, and being cured by irradiation with an active energy ray so as to be capable of adjusting the adhesion force. The active energy ray-curable adhesive composition is preferably an ultraviolet-curable adhesive composition. The active energy ray-curable adhesive composition further contains an active energy ray-polymerizable compound in addition to the base polymer and the crosslinking agent. Further, a photopolymerization initiator, a photosensitizer, or the like may be further contained as necessary.
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, adhesion-imparting agents, fillers (metal powders, other inorganic powders, and the like), antioxidants, ultraviolet absorbers, dyes, pigments, colorants, antifoaming agents, anticorrosion agents, and photopolymerization initiators for imparting light scattering properties.
The pressure-sensitive adhesive layer can be formed by applying a diluted solution of the pressure-sensitive adhesive composition in an organic solvent to a substrate and drying the applied solution. When an active energy ray-curable pressure-sensitive adhesive composition is used, a cured product having a desired degree of curing can be obtained by irradiating the pressure-sensitive adhesive layer formed with an active energy ray.
The thickness of the pressure-sensitive adhesive layer is, for example, preferably 1 μm to 100 μm, more preferably 3 μm to 50 μm, and may be 20 μm or more.
(polarizer layer)
Examples of the polarizer layer include a stretched film or a stretched layer having a dichroic dye adsorbed thereon, and a layer obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound. As the dichroic dye, specifically, iodine or a dichroic organic dye can be used. The dichroic organic dye includes a dichroic direct dye composed of a disazo compound such as c.i. direct red 39, and a dichroic direct dye composed of a compound such as trisazo or tetrazo.
Examples of the polarizer layer obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound include a polarizer layer containing a cured product of a polymerizable liquid crystal compound, such as a layer obtained by applying and curing a composition containing a dichroic dye having liquid crystallinity or a composition containing a dichroic dye and a polymerizable liquid crystal.
The polarizer layer obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound is preferable because the direction of bending is not limited as compared with the stretched film or the stretched layer having the dichroic dye adsorbed thereon.
((polarizer layer as stretched film or stretched layer))
The polarizer layer as a stretched film having a dichroic dye adsorbed thereon can be generally produced through the following steps: a step of uniaxially stretching a polyvinyl alcohol resin film; a step of adsorbing a dichroic dye by dyeing a polyvinyl alcohol resin film with the dichroic dye; treating the polyvinyl alcohol resin film having the dichroic dye adsorbed thereon with an aqueous boric acid solution; and a step of washing with water after the treatment with the aqueous boric acid solution.
The thickness of the polarizer layer is, for example, 2 μm to 40 μm. The thickness of the polarizer layer may be 5 μm or more, may be 20 μm or less, may be 15 μm or less, and may be 10 μm or less.
The polyvinyl alcohol resin is 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 is used. Examples of the other monomer copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and (meth) acrylamides 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 for example, 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 generally produced through the following steps: a step of applying a coating liquid containing the polyvinyl alcohol resin onto a base film; a step of uniaxially stretching the obtained laminated film; a step of dyeing the polyvinyl alcohol resin layer of the uniaxially stretched laminate film with a dichroic dye to adsorb the dichroic dye to form a polarizer layer; treating the film having the dichroic dye adsorbed thereon with an aqueous boric acid solution; and a step of washing the substrate with water after the treatment with the aqueous boric acid solution.
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 may be incorporated in a laminate in a form in which a thermoplastic resin film is laminated on one surface or both surfaces thereof. The thermoplastic resin film can function as a protective film or a retardation film for a polarizer layer. The thermoplastic resin film is made of polyolefin resins such as chain polyolefin resins (polypropylene resins, etc.) and cyclic polyolefin resins (norbornene resins, etc.); cellulose resins such as triacetyl cellulose; polyester resins such as polyethylene terephthalate, polyethylene naphthalate and polybutylene terephthalate; a polycarbonate-based resin; (meth) acrylic resins; or a mixture thereof.
From the viewpoint of thinning, the thickness of the thermoplastic resin film is usually 300 μm or less, preferably 200 μm or less, more preferably 100 μm or less, further preferably 80 μm or less, further preferably 60 μm or less, and further usually 5 μm or more, preferably 20 μm or more.
The thermoplastic resin film may or may not have a phase difference.
The thermoplastic resin film may be bonded to the polarizer layer using an adhesive layer, for example.
(polarizer layer obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound)
Examples of the polarizer layer obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound include a polarizer layer containing a cured product of a polymerizable liquid crystal compound, such as a layer obtained by applying and curing a composition containing a polymerizable dichroic dye having liquid crystallinity or a composition containing a dichroic dye and a polymerizable liquid crystal to a base film.
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 above.
The polarizer layer obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound may be incorporated in an optical laminate in a form in which a thermoplastic resin film is laminated on one or both surfaces thereof. As the thermoplastic resin film, the same thermoplastic resin film as that usable for the stretched film or the polarizer layer of the stretched layer can be used. The thermoplastic resin film may be bonded to the polarizer layer using an adhesive layer, for example.
The thickness of the polarizer layer obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound is usually 10 μm or less, preferably 0.5 to 8 μm, and more preferably 1 to 5 μm.
The interlayer coating 12 may include, for example, a polarizer layer obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound. Examples of the structure including the substrate layer 15 and the intermediate coating layer 12 in contact with each other include a structure in which a polarizer layer obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound to a substrate film is formed, and a structure in which a thermoplastic resin film is bonded to a polarizer layer obtained by applying and curing a composition containing a dichroic dye and a polymerizable compound to a polarizer film. When the interlayer coating layer 12 includes a polarizer layer obtained by applying and curing a composition including a dichroic dye and a polymerizable compound, the interlayer coating layer 12 may further include an alignment film, a protective layer (specifically, a Hard Coat (HC) layer or an Overcoat (OC) layer), or the like, which is one of the coating layers.
(retardation layer)
The laminate 100 may include 1 or 2 or more retardation layers. The phase difference layer is typically disposed between the polarizer layer and the back panel. The retardation layer may be laminated on another layer (including another retardation layer) via the 1 st pressure-sensitive adhesive layer 11, the 2 nd pressure-sensitive adhesive layer 13, or a layer (hereinafter, also referred to as a laminating layer) made of a pressure-sensitive adhesive or an adhesive other than these layers.
The phase difference layer can be a positive A plate and a positive C plate such as a lambda/4 plate and a lambda/2 plate. The retardation layer may be a resin film exemplified as a material of the protective film, or may be a layer obtained by curing a polymerizable liquid crystal compound. The retardation layer may further comprise an alignment film or a substrate film. 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 obtained by curing the polymerizable liquid crystal compound can be formed by applying a composition containing the polymerizable liquid crystal compound to 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.
The retardation layer obtained by curing the polymerizable liquid crystal compound may be incorporated in the laminate 100 in a form having an alignment layer and/or a substrate film.
The interlayer coating layer 12 may include, for example, a retardation layer obtained by curing a polymerizable liquid crystal compound. As the structure including the base layer 15 and the intermediate coating layer 12 in contact with each other, there is exemplified a structure in which a retardation layer obtained by curing a polymerizable liquid crystal compound is formed on a base film. When the interlayer coating layer 12 includes a retardation layer obtained by curing a polymerizable liquid crystal compound, the interlayer coating layer 12 may further include an alignment film, a protective layer (specifically, a hard coat layer or an overcoat layer), or the like, which is one of the coating layers.
(touch sensor panel)
The touch sensor panel is not limited to a detection method as long as it is a sensor capable of detecting a touched position, and examples thereof include touch sensor panels of a resistive film method, a capacitive method, an optical sensor method, an ultrasonic wave method, an electromagnetic induction coupling method, a surface acoustic wave method, and the like. Among them, a touch sensor panel of the electrostatic capacitance type is preferably used in terms of low cost, high response speed, and thin film formation. The touch sensor panel may include an adhesive layer, a separation layer, a protective layer, and the like between the transparent conductive layer and a base film supporting the transparent conductive layer. Examples of the adhesive layer include an adhesive layer and an adhesive layer.
Examples of the substrate film supporting the transparent conductive layer include a substrate film having a transparent conductive layer formed by vapor deposition on one surface thereof, a substrate film having a transparent conductive layer transferred thereto via an adhesive layer, and the like.
An example of a capacitive touch sensor panel includes a base film, a transparent conductive layer for position detection provided on a surface of the base film, and a touch position detection circuit. In a display device provided with an optical laminate having a capacitive touch sensor panel, if the surface of a front panel is touched, a transparent conductive layer is grounded at the touched point via the capacitance of a human body. The touch position detection circuit detects grounding of the transparent conductive layer, thereby detecting a touched position. By having a plurality of transparent conductive layers separated from each other, more detailed position detection can be performed.
The transparent conductive layer may be a transparent conductive layer made of a metal oxide such as ITO, or may be a metal layer made of metal such as aluminum, copper, silver, gold, or an alloy thereof. The transparent electrode layer is formed by an application method such as a sputtering method, a printing method, or a vapor deposition method. A photosensitive resist is formed on the transparent electrode layer, and then an electrode pattern layer is formed by photolithography. The photosensitive resist may be a negative photosensitive resist or a positive photosensitive resist, and the photosensitive resist may be left or removed after patterning. In the case of film formation by the sputtering method, a mask having an electrode pattern shape may be disposed, and sputtering may be performed to form an electrode pattern layer.
The separation layer may be a layer formed over a substrate such as glass for separating a transparent conductive layer formed over the separation layer from the substrate together with the separation layer. The separation layer is preferably an inorganic layer or an organic layer. Examples of the material for forming the inorganic layer include silicon oxide. As a material for forming the organic layer, for example, a (meth) acrylic resin composition, an epoxy resin composition, a polyimide resin composition, or the like can be used. The separation layer may be applied by a known coating method and cured by a method of thermal curing or UV curing or a combination thereof.
A protective layer may be disposed in contact with the transparent conductive layer to protect the conductive layer. The protective layer includes at least one of an organic insulating film and an inorganic insulating film, and these films can be formed by coating methods such as a spin coating method, a sputtering method, and an evaporation method.
The insulating layer can be formed of, for example, an inorganic insulating material such as silicon oxide or a transparent organic material such as an acrylic resin. The insulating layer can be formed by applying the insulating layer by a known coating method, and then thermally curing, UV curing, thermal drying, vacuum drying, or the like.
Examples of the base film of the touch sensor panel include resin films of triacetyl cellulose, polyethylene terephthalate, cycloolefin polymer, polyethylene naphthalate, polyolefin, polycycloolefin, polycarbonate, polyethersulfone, polyarylate, polyimide, polyamide, polystyrene, polynorbornene, and the like. From the viewpoint of easily constituting a substrate film having desired toughness, polyethylene terephthalate is preferably used.
The thickness of the base film of the touch sensor panel is preferably 50 μm or less, and more preferably 30 μm or less, from the viewpoint of ease of formation of an optical laminate having excellent bending resistance. The thickness of the base film of the touch sensor panel is, for example, 5 μm or more.
The touch sensor panel can be manufactured, for example, as follows. In the method 1, first, a base film is laminated on a substrate via an adhesive layer. A transparent conductive layer patterned by photolithography is formed on the base film. The substrate and the base film are separated by heating, and a touch sensor panel including the transparent conductive layer and the base film is obtained. The substrate is not particularly limited as long as it is a substrate having heat resistance while maintaining flatness, and is preferably a glass substrate.
In the method 2, a material for forming a separation layer is first coated on a substrate to form the separation layer. If necessary, a protective layer is formed on the separation layer by coating. A protective layer is formed on the portion where the pad pattern layer is formed so as not to form a protective layer. A transparent conductive layer patterned by photolithography is formed over the separation layer (or the protective layer). An insulating layer is formed on the transparent conductive layer so as to fill the electrode pattern layer. A protective film is laminated on the insulating layer with a peelable adhesive, and the protective film is transferred from the insulating layer to the release layer to separate the substrate. By peeling off the peelable protective film, a touch sensor panel having an insulating layer/transparent conductive layer/(protective layer)/separation layer in this order can be obtained.
When the substrate film is included, the thickness of the touch sensor panel may be, for example, 5 to 2000 μm, or 5 to 100 μm.
When the substrate film is not included, the thickness of the touch sensor panel is, for example, 0.5 to 10 μm, preferably 5 μm or less.
The intervening coating 12 may comprise, for example, a touch sensor panel made by method 2. Examples of the structure including the base layer 15 and the interlayer coating layer 12 in contact with each other include a structure in which the touch sensor panel manufactured by the above-described method 1, the base film, and the touch sensor panel manufactured by the above-described method 2 are bonded with an adhesive.
(laminating layer)
The adhesive layer is a layer made of an adhesive or a bonding agent. The lamination layer may be, for example, a layer laminating the front panel and the touch sensor panel, a layer laminating the front panel and the polarizing plate, or a layer laminating the polarizing plate and the touch sensor panel. The adhesive constituting the adhesive layer may be the same adhesive as exemplified for the adhesive composition constituting the adhesive layer, or may be another adhesive such as a (meth) acrylic adhesive, a styrene adhesive, a silicone adhesive, a rubber adhesive, a urethane adhesive, a polyester adhesive, an epoxy copolymer adhesive, and the like.
The laminate 100 may have 1 bonding layer, or may have 2 or more. When the laminate 100 includes a plurality of lamination layers, the lamination layers may be the same as or different from each other.
The adhesive constituting the adhesive layer may be formed by combining 1 or 2 or more kinds of water-based adhesives, active energy ray-curable adhesives, pressure-sensitive adhesives, and the like. 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 photopolymerization initiators containing a substance that generates an active species such as a neutral radical, an anionic radical, and a cationic radical by irradiation with an active energy ray such as ultraviolet ray.
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.
(Back plate)
As the back plate, a plate-like body capable of transmitting light, a component used in a general display device, or the like can be used.
The thickness of the back plate may be, for example, 5 to 2000. mu.m, preferably 10 to 1000. mu.m, and more preferably 15 to 500. mu.m.
The plate-like body used for the back plate may be composed of only 1 layer or 2 or more layers, and the plate-like body exemplified for the plate-like body described above for the front plate can be used.
Examples of the constituent elements used in a typical display device used for a back panel include a touch sensor panel and an organic EL display element. Examples of the order of stacking the components in the display device include a window film, a circularly polarizing plate, a touch sensor panel, an organic EL display element, a window film, a touch sensor panel, a circularly polarizing plate, and an organic EL display element.
From the viewpoint of facilitating the formation of the laminate 100 having excellent flexibility, the tensile elastic modulus of the back plate at a temperature of 23 ℃ is preferably 4.0GPa or more, and more preferably 4.5GPa or more. From the viewpoint of facilitating the formation of the laminate 100 having excellent flexibility, the tensile elastic modulus of the back plate at a temperature of 23 ℃ is preferably 20GPa or less, and more preferably 15GPa or less. The tensile modulus can be measured by the test method described in the following section of examples.
[ method for producing laminate ]
The laminate 100 can be manufactured by a method including the steps of: a step of bonding the layers constituting the laminate 100 to each other via an adhesive layer or further via an adhesive layer. When the layers are bonded to each other via an adhesive layer or an adhesive layer, one or both of the bonding surfaces are preferably subjected to a surface activation treatment such as corona treatment in order to improve the adhesion.
< display device >
The display device of the present invention includes the laminate 100 of the present invention described above. The display device is not particularly limited, and examples thereof include image display devices such as an organic EL display device, an inorganic EL display device, a liquid crystal display device, and an electroluminescence display device. The display device may have a touch panel function. The optical laminate is suitable for a flexible display device which can be bent or folded.
In the display device, the optical laminate is disposed on the viewing side of the display element included in the display device with the front panel facing outward (the side opposite to the display element side, i.e., the viewing side).
The display device of the invention can be used as mobile equipment such as smart phones and tablet computers, televisions, digital photo frames, electronic labels, measuring instruments, office equipment, medical equipment, computer equipment 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.
< laminate composed of substrate film/No. 1 oriented film/polarizer layer/protective layer (OC layer) >
(substrate film)
As a base film, a triacetyl cellulose (TAC) film (manufactured by Konika Mentoda, Ltd., thickness: 25 μm) was prepared.
(composition for Forming alignment film)
The polymer 1 is a polymer having a photoreactive group composed of the following structural units.
The molecular weight of the obtained polymer 1 was measured by GPC and showed a number average molecular weight of 28200, Mw/Mn1.82, and the monomer content was 0.5%.
A solution obtained by dissolving the polymer 1 in cyclopentanone at a concentration of 5 mass% was used as the composition for forming an alignment film.
(polymerizable liquid Crystal Compound)
As the polymerizable liquid crystal compound, a polymerizable liquid crystal compound represented by the formula (1-6) [ hereinafter also referred to as Compound (1-6) ] and a polymerizable liquid crystal compound represented by the formula (1-7) [ hereinafter also referred to as Compound (1-7) ] were used.
The compounds (1-6) and (1-7) were synthesized by the method described in Lub et al, Recl, Trav, Chim, Pays-bas, 115, 321-328 (1996).
(dichroic dye)
As the dichroic dye, azo dyes described in examples of Japanese patent application laid-open publication No. 2013-101328 represented by the following formulae (2-1a), (2-1b), and (2-3a) are used.
(composition for Forming polarizer layer)
The composition for forming a polarizer layer was prepared by mixing 400 parts by mass of toluene as a solvent with 75 parts by mass of the compound (1-6), 25 parts by mass of the compound (1-7), 2.5 parts by mass of each of azo dyes represented by the above formulae (2-1a), (2-1b), and (2-3a) as dichroic dyes, 6 parts by mass of 2-dimethylamino-2-benzyl-1- (4-morpholinophenyl) butane-1-one (Irgacure369, manufactured by BASF japan) as a polymerization initiator, and 1.2 parts by mass of a polyacrylate compound (manufactured by BYK-361N, BYK-Chemie) as a leveling agent, and stirring the resulting mixture at 80 ℃ for 1 hour.
(composition for overcoat layer (OC layer))
The composition for a protective layer was prepared by mixing 3 parts by mass of a polyvinyl alcohol resin powder (manufactured by Kuraray Co., Ltd., average polymerization degree 18000, trade name: KL-318) and 1.5 parts by mass of a polyamide epoxy resin (a crosslinking agent, manufactured by Suzuki Chemtex Co., Ltd., trade name: SR650(30)) with 100 parts by mass of water.
(production of a laminate comprising "substrate film/No. 1 alignment film/polarizer layer/protective layer (OC layer)")
The substrate film was subjected to corona treatment. The conditions of the corona treatment were an output of 0.3kW and a treatment speed of 3 m/min. Then, the composition for forming an alignment film was applied to the base film by a bar coating method, and dried by heating in a drying oven at 80 ℃ for 1 minute. The obtained dried film was subjected to polarized UV irradiation treatment to form a1 st alignment film. The polarized UV treatment was carried out by passing light irradiated from a UV irradiation apparatus (SPOT CURE SP-7; manufactured by Ushio Motor Co., Ltd.) through a wire grid (UIS-27132# #, manufactured by Ushio Motor Co., Ltd.) so that the cumulative light amount measured at a wavelength of 365nm was 100mJ/cm2Under the conditions of (1). The thickness of the 1 st alignment film was 100 nm.
On the formed 1 st alignment film, the composition for forming a polarizer layer was applied by a bar coating method, dried by heating in a drying oven at 120 ℃ for 1 minute, and then cooled to room temperature. Using the above UV irradiation apparatus, the cumulative light amount was 1200mJ/cm2The dried film was irradiated with ultraviolet light (365nm basis) to form a polarizer layer. The thickness of the obtained polarizer layer was measured by a laser microscope (OLS 3000, manufactured by Olympus Co., Ltd.) to obtain a thickness of 1.8. mu.m. In this manner, a laminate composed of "substrate film/1 st alignment film/polarizer layer" was obtained.
On the formed polarizer layer, a composition for a protective layer (OC layer) was applied by a bar coating method, applied so that the thickness after drying became 1.0 μm, and dried at 80 ℃ for 3 minutes. In this manner, a laminate composed of "substrate film/1 st alignment film/polarizer layer/protective layer (OC layer)" was obtained.
< laminate comprising "base film/No. 2 alignment film/retardation layer
(substrate film)
A polyethylene terephthalate (PET) film (thickness: 100 μm) was prepared as a base film.
The composition for forming an alignment film described in the above item < laminate composed of "base film/1 st alignment film/polarizer layer/protective layer (OC layer) > was used as the composition for forming an alignment film.
(composition for Forming retardation layer)
The following components were mixed, and the resulting mixture was stirred at 80 ℃ for 1 hour to obtain a composition for forming a retardation layer.
A compound b-1 represented by the following formula: 80 parts by mass
A compound b-2 represented by the following formula: 20 parts by mass
Polymerization initiators (Irgacure369, 2-dimethylamino-2-benzyl-1- (4-morpholinophenyl) butan-1-one, manufactured by BASF Japan): 6 parts by mass
Leveling agent (BYK-361N, polyacrylate compound, BYK-Chemie Co., Ltd.): 0.1 part by mass
Solvent (cyclopentanone): 400 parts by mass
(preparation of a laminate comprising "substrate film/No. 2 alignment film/retardation layer")
The composition for forming an alignment film was applied to a base film by a bar coating method, and dried by heating in a drying oven at 80 ℃ for 1 minute. The obtained dried film was subjected to polarized UV irradiation treatment to form a2 nd alignment film. Polarized UV treatment Using the UV irradiation device, the cumulative light amount measured at a wavelength of 365nm was 100mJ/cm2Under the conditions of (1). In addition, absorption with respect to the polarizing layer in the polarization direction of the polarized UVThe axis is at 45 deg.. In this manner, a laminate composed of "substrate film/2 nd alignment film" was obtained. The thickness of the 2 nd alignment film was 100 nm.
The retardation layer-forming composition was applied to the 2 nd alignment film of the laminate composed of "base film/2 nd alignment film" by a bar coating method, dried by heating in a drying oven at 120 ℃ for 1 minute, and then cooled to room temperature. The obtained dried film was irradiated with a cumulative light amount of 1000mJ/cm using the UV irradiation device2Ultraviolet rays (365nm basis), thereby forming a retardation layer. The thickness of the obtained retardation layer was measured by a laser microscope (OLS 3000, manufactured by Olympus Co., Ltd.) to be 2.0. mu.m. The phase difference layer is a lambda/4 plate exhibiting a lambda/4 phase difference value in the in-plane direction. In this manner, a laminate composed of "base film/2 nd alignment film/retardation layer" was obtained.
< retardation film >
As the retardation Film, an 1/4 wavelength plate (Zeonor Film, manufactured by Nippon Ralsberg Co., Ltd.) having a thickness of 20 μm was prepared as a uniaxially stretched Film of a cycloolefin resin.
< adhesive sheet >
(adhesive composition A)
A mixed solution of 81.8 parts by mass of acetone, 98.6 parts by mass of butyl acrylate, 0.4 part by mass of acrylic acid and 1.0 part by mass of 2-hydroxyethyl acrylate was charged into a reactor equipped with a cooling tube, a nitrogen introduction tube, a thermometer and a stirrer, and the air in the apparatus was replaced with nitrogen gas without containing oxygen while the internal temperature was elevated to 55 ℃. Then, a solution prepared by dissolving 0.14 parts by mass of azobisisobutyronitrile (polymerization initiator) in 10 parts by mass of acetone was added to the total amount. After 1 hour of addition of the polymerization initiator, acetone was continuously added to the reactor at an addition rate of 17.3 parts by mass/hr so that the concentration of the acrylic resin from which monomers were removed became 35%, and the reactor was kept at an internal temperature of 54 to 56 ℃ for 12 hours, and finally ethyl acetate was added to adjust the acrylic resin solution A so that the concentration of the acrylic resin became 20%.
The nonvolatile component of the acrylic resin solution A was added to an acrylic resin: 100 parts by mass
Isocyanate-based compound: 0.4 part by mass
Silane-based compound: 0.5 parts by mass.
Ethyl acetate was added so that the total solid content concentration became 10%, to obtain a pressure-sensitive adhesive composition a.
The isocyanate compound was prepared using an ethyl acetate solution (solid content concentration: 75%) of a trimethylolpropane adduct of tolylene diisocyanate ("Coronate L", manufactured by tokyo corporation). 3-glycidoxypropyltrimethoxysilane (KBM 403, product of shin-Etsu chemical Co., Ltd.) was used as the silane compound.
(adhesive sheets "A40", "A25", "A15")
The obtained pressure-sensitive adhesive composition a was applied to a release-treated surface of a polyethylene terephthalate film (light release film B, thickness 38 μm) subjected to release treatment with an applicator (applicator) so that the thickness after drying became 40 μm, and dried at 100 ℃ for 1 minute to obtain a film having a pressure-sensitive adhesive layer. Then, another polyethylene terephthalate film (heavy release film A, thickness 38 μm) subjected to mold release treatment was attached to the pressure-sensitive adhesive layer. Then, the mixture was aged at 23 ℃ and 50% RH relative humidity for 7 days to prepare an adhesive sheet "A40".
A psa sheet "a 25" was produced in the same manner as "a 40" except that the psa sheet was applied so that the dried thickness became 25 μm.
A psa sheet "a 15" was produced in the same manner as "a 40" except that the psa sheet was applied so that the dried thickness became 15 μm.
(adhesive composition B)
An acrylic resin solution B was obtained in the same manner as the acrylic resin solution a except that the monomer composition was changed to 78.6 parts of butyl acrylate, 20 parts of methyl methacrylate, 0.4 part of acrylic acid, and 1.0 part of 2-hydroxyethyl acrylate.
The nonvolatile component of the acrylic resin solution B was added to an acrylic resin: 100 parts by mass
Isocyanate-based compound: 0.5 part by mass
Silane-based compound: 0.5 parts by mass.
Ethyl acetate was added so that the total solid content concentration became 10%, to obtain a binder composition B. The same isocyanate compound and silane compound as those used in the adhesive composition a were used.
(adhesive sheets "B40", "B25", "B15")
Adhesive sheets "B40", "B25" and "B15" having adhesive layer thicknesses of 40 μm, 25 μm and 15 μm after drying were produced in the same manner as the adhesive sheet "a 40" except that the adhesive composition B was used.
(adhesive composition C)
An acrylic resin solution C was obtained in the same manner as the acrylic resin solution a except that the monomer composition was changed to 61.0 parts of butyl acrylate, 37 parts of methyl methacrylate, 1.0 part of acrylic acid, and 1.0 part of 2-hydroxyethyl acrylate.
The nonvolatile component of the acrylic resin solution C was added to an acrylic resin: 100 parts by mass
Isocyanate-based compound: 3.0 parts by mass
Silane-based compound: 0.5 parts by mass.
Ethyl acetate was added so that the total solid content concentration became 10%, to obtain a binder composition C. The same isocyanate compound and silane compound as those used in the adhesive composition a were used.
(adhesive sheets "C25", "C15", "C05")
Pressure-sensitive adhesive sheets "C25", "C15" and "C05" having pressure-sensitive adhesive layer thicknesses of 25 μm, 15 μm and 5 μm after drying were produced in the same manner as in the above-mentioned pressure-sensitive adhesive sheet "a 40" except that the pressure-sensitive adhesive composition C was used.
For the adhesive layer thus produced, the storage modulus and the layer thickness were measured as described below, and the evaluation parameter a (storage modulus/layer thickness) was obtained. The evaluation parameter A is a collective term for A1 and A2. The results are shown in Table 1.
[ Table 1]
[ thickness of layer ]
The thickness of the pressure-sensitive adhesive layer was measured using a contact type film thickness measuring apparatus ("MS-5C" manufactured by Nikon corporation). The polarizer layer and the alignment film were measured using a laser microscope (OLS 3000, Olympus).
[ method for measuring storage modulus ]
The storage modulus at 25 ℃ of the adhesive layer was measured using a viscoelasticity measuring apparatus (MCR-301, Anton Paar Co.). Each adhesive sheet having a thickness of 25 μm was cut to a width of 30 mm. times.a length of 30 mm. After peeling the release film, a plurality of sheets were laminated and bonded to a glass plate so that the thickness became 150 μm, and then the film was bonded to a measurement chip, and measured in a temperature range of-20 ℃ to 100 ℃ under the conditions of a frequency of 1.0Hz, a deformation amount of 1%, and a temperature rise rate of 5 ℃/min, and the storage modulus at a temperature of 25 ℃ was confirmed.
< front panel >
A polyimide film (HC-PI film, thickness: 70 μm, tensile modulus 5.6GPa) having a hard coat layer on one surface was prepared as a window film as a front panel.
< Back plate >
As a back plate, a polyethylene terephthalate (PET) substrate (38 μm in thickness, 4.5GPa in tensile modulus) was prepared.
[ method for measuring tensile elastic modulus ]
The tensile modulus of elasticity of the front and back panels was measured as follows. Rectangular pieces with a long side of 110mm x a short side of 10mm were cut out from the front or back panel using a super cutter. Then, both ends in the longitudinal direction of the measurement sample were clamped by upper and lower clamps of a tensile tester (Autograph AG-Xplus tester, manufactured by shimadzu corporation) so that the distance between the clamps was 5cm, the measurement sample was stretched at a tensile rate of 4 mm/min in the longitudinal direction of the measurement sample under an environment of 23 ℃ and a relative humidity of 55%, and the tensile elastic modulus at 23 ℃ and a relative humidity of 55% was calculated from the slope of a straight line between 20MPa and 40MPa in the obtained stress-strain curve. In this case, the thickness for calculating the stress was measured by the method described above.
< production of laminate of example 1-1 >
The light release film B was peeled from the adhesive sheet "C25" and bonded to the protective layer (OC layer) side of the laminate composed of "substrate film/1 st alignment film/polarizer layer/protective layer (OC layer)", to obtain a laminate a 1. Both sides of the bonded surfaces were subjected to corona treatment (output 0.3kW, speed 3 m/min).
The heavy release film a was peeled from the laminate a1, and was bonded to a retardation film as a retardation layer to obtain a laminate a 2. Both sides of the bonded surfaces were subjected to corona treatment (output 0.3kW, speed 3 m/min).
The light release film B was peeled from the pressure-sensitive adhesive sheet "C15" and bonded to the retardation layer side of laminate a2 to obtain laminate A3. Both sides of the bonded surfaces were subjected to corona treatment (output 0.3kW, speed 3 m/min).
The light release film B was peeled from the pressure-sensitive adhesive sheet "a 25" and was bonded to the side of the front panel not having the hard coat layer, to obtain a laminate a 4. Both sides of the bonded surfaces were subjected to corona treatment (output 0.3kW, speed 3 m/min).
The heavy release film a was peeled from the laminate a4 and bonded to the base film side of the laminate A3, yielding laminate a 5. Both sides of the bonded surfaces were subjected to corona treatment (output 0.3kW, speed 3 m/min).
The heavy release film a was peeled from the laminate a5 and attached to a back surface plate to obtain a laminate of example 1-1 shown in fig. 2. In fig. 2, the front plate is a1 st protective layer 10, the adhesive layer under the front plate is a1 st adhesive layer 11, the base film is a base layer 15, the interlayer 12 is provided from the 1 st alignment film to the protective layer (OC layer), the adhesive layer under the protective layer (OC layer) is a2 nd adhesive layer 13, and the retardation layer to the rear plate is a2 nd protective layer 14.
< production of laminate of example 1-2 >
A laminate of example 1-2 was obtained in the same manner as in example 1-1, except that "C05" was used in place of the pressure-sensitive adhesive sheet "C15".
Production of laminate of < comparative example 1-1 >
A laminate of comparative example 1-1 was obtained in the same manner as in example 1-1, except that "C05" was used in place of psa sheet "a 25", that "C15" was used in place of "C25", and that "C05" was used in place of "C15".
Production of laminate of < comparative example 1-2 >
A laminate of comparative example 1-2 was obtained in the same manner as in example 1-1, except that "C15" was used in place of the pressure-sensitive adhesive sheet "A25" and "C05" was used in place of "C25".
Production of laminate of < comparative examples 1 to 3 >
A laminate of comparative example 1-3 was obtained in the same manner as in example 1-1, except that "B25" was used in place of psa sheet "a 25", that "B15" was used in place of "C25", and that "B25" was used in place of "C15".
The adhesive layers used in the laminates of examples 1-1 and 1-2 and comparative examples 1-1, 1-2 and 1-3 are shown in Table 2. The values of "A1 + A2", "A2-A1" and "A2" are shown in Table 2. The results of the bending test of the laminate are shown in table 2.
[ bending test ]
The laminate was subjected to an evaluation test for confirming the bendability using a bending evaluation apparatus (STS-VRT-500, Science Town). Fig. 4 is a diagram schematically showing the method of the evaluation test. As shown in fig. 4, the two movable mounting tables 501 and 502 are arranged so that the gap C becomes 2mm (bending radius 1mm), and the laminate is fixedly arranged with the center in the width direction positioned at the center of the gap C and the first protective layer 1 positioned on the upper side (fig. 4 (a)). Then, the two tables 501 and 502 are rotated upward by 90 degrees about the position P1 and the position P2 as the center of the rotation axis, and a bending force is applied to the region of the laminated body corresponding to the gap C of the tables (fig. 4 (b)). Then, the two tables 501 and 502 are returned to their original positions (fig. 4 (a)). The above series of operations was completed, and the number of times of addition of the bending force was counted as 1 time. After repeating this at a temperature of 25 ℃, it was confirmed whether or not cracks were generated in the coating layer in the regions of the laminate corresponding to the gap C of the mounting tables 501 and 502. The moving speed and the step of applying the bending force of the mounting tables 501 and 502 are the same in the evaluation test of any laminate.
A: no cracks were generated even if the number of times of the addition of the bending force reached 30 ten thousand.
B: cracks are generated when the number of times of applying the bending force is 20 ten thousand or more and less than 30 ten thousand.
C: cracks are generated when the number of times of applying the bending force is 10 ten thousand or more and less than 20 ten thousand.
D: cracks were generated when the number of times of the bending force addition was less than 10 ten thousand.
[ Table 2]
In the table, the upper section of the region surrounded by the thick outline is the evaluation parameter a1 of the 1 st adhesive layer, and the lower section is the evaluation parameter a2 of the 2 nd adhesive layer.
In Table 2, "A1 + A2", "A1 + A2 ≦ 130" is "A", and "130 > A1+ A2 ≦ 230" is "B", and "230 > A1+ A2 ≦ 260" is "C", and "260 > A1+ A2" is "D". For "A2-A1", 100. ltoreq. A2-A1 "is set as" A ", 0. ltoreq. A2-A1> 100" is set as "B", 100. ltoreq. A2-A1>0 "is set as" C ", and" A2-A1> -100 "is set as" D ". For "A2," 60. ltoreq. A2 "is set to" A ", 34. ltoreq. A2> 60" is set to "B", 10. ltoreq. A2>34 "is set to" C ", and" A2>10 "is set to" D ". The same applies to the following table.
In the laminates of examples 1-1 and 1-2, "a 1+ a 2" was 230 or less, "a 2-a 1" was 0 or more, and "a 2" was 34 or more. In these laminates, the occurrence of cracks in the coating layer is suppressed. On the other hand, in the laminate of comparative example 1-1 in which "a 1+ a 2" was more than 230, "a 2-a 1" was less than 0, "a 1+ a 2" was more than 230, "a 1+ a 2" was less than 34, "a 2" was less than 34, the generation of cracks was not suppressed, although the same coating layer and base material layer were used.
< production of laminate in example 2-1 >
The light release film B was peeled from the adhesive sheet "C25" and bonded to the protective layer (OC layer) side of the laminate composed of "substrate film/1 st alignment film/polarizer layer/protective layer (OC layer)", to obtain a laminate B1. Both sides of the bonded surfaces were subjected to corona treatment (output 0.3kW, speed 3 m/min).
The heavy release film a was peeled from the laminate B1 and bonded to the retardation layer side of the laminate composed of "base film/2 nd alignment film/retardation layer" to obtain a laminate B2. Both sides of the bonded surfaces were subjected to corona treatment (output 0.3kW, speed 3 m/min).
The light release film B was peeled from the pressure-sensitive adhesive sheet "C15" and bonded to the surface of the 2 nd alignment film and the base film used for formation of the retardation layer peeled from the laminate B2, to obtain a laminate B3. Both sides of the bonded surfaces were subjected to corona treatment (output 0.3kW, speed 3 m/min).
The light release film B was peeled from the pressure-sensitive adhesive sheet "a 25" and bonded to the side of the front panel not having the hard coat layer to obtain a laminate B4. Both sides of the bonded surfaces were subjected to corona treatment (output 0.3kW, speed 3 m/min).
The heavy release film a was peeled from the laminate B4 and bonded to the base film side of the laminate B3, yielding laminate B5. Both sides of the bonded surfaces were subjected to corona treatment (output 0.3kW, speed 3 m/min).
The heavy release film a was peeled from the laminate B5 and attached to a back surface plate to obtain a laminate of example 2-1 shown in fig. 3. In fig. 3, the front plate is a1 st protective layer 10, the adhesive layer under the front plate is a1 st adhesive layer 11, the base film is a base layer 15, the interlayer 12 is provided from the 1 st alignment film to the protective layer (OC layer), the adhesive layer under the protective layer (OC layer) is a2 nd adhesive layer 13, and the retardation layer to the rear plate is a2 nd protective layer 14.
< production of laminate of example 2-2 >
A laminate of example 2-2 was obtained in the same manner as in example 2-1, except that "C05" was used in place of the pressure-sensitive adhesive sheet "C15".
Production of laminate of < comparative example 2-1 >
A laminate of comparative example 2-1 was obtained in the same manner as in example 2-1, except that "C05" was used in place of psa sheet "A25", that "C15" was used in place of "C25", and that "C05" was used in place of "C15".
Production of laminate of < comparative example 2-2 >
A laminate of comparative example 2-2 was obtained in the same manner as in example 2-1, except that "C15" was used in place of the pressure-sensitive adhesive sheet "A25" and "C05" was used in place of "C25".
Production of laminate of < comparative example 2-3 >
A laminate of comparative example 2-3 was obtained in the same manner as in example 2-1, except that "B25" was used in place of psa sheet "A25", that "B15" was used in place of "C25", and that "B25" was used in place of "C15".
The adhesive layers used in the laminates of examples 2-1 and 2-2 and comparative examples 2-1, 2-2 and 2-3 are shown in Table 3. The values of "A1 + A2", "A2-A1" and "A2" are shown in Table 3. The results of the bending test of the laminate are shown in table 3.
[ Table 3]
In the table, the upper stage of the region surrounded by the thick line is the evaluation parameter a1 of the 1 st adhesive layer, and the lower stage is the evaluation parameter a2 of the 2 nd adhesive layer.
In the laminates of examples 2-1 and 2-2, "A1 + A2" was 230 or less, "A2-A1" was 0 or more, and "A2" was 34 or more. In these laminates, the occurrence of cracks in the coating layer is suppressed. On the other hand, in the laminate of comparative example 2-1 in which "a 1+ a 2" was more than 230, "a 2-a 1" was less than 0, "a 1+ a 2" was more than 230, "a 1+ a 2" was less than 34, "a 2" was less than 34, the generation of cracks was not suppressed, although the same coating layer and base material layer were used.
Description of the symbols
The multilayer structure comprises a 100-layer laminate, a 10 st protective layer, a 11 st adhesive layer, a1 st adhesive layer, a 12-layer interlayer, a 13 nd adhesive layer, a2 nd protective layer, a15 th base material layer, 501 and 502 placement tables, a1 st front panel, a2 nd adhesive layer, a3 rd base material film, a4 th polarizer layer, a5 th retardation layer, a 6 th back panel, a 7 st alignment film and an 8 th protective layer (OC layer).
Claims (7)
1. A laminate comprising a1 st protective layer, a1 st adhesive layer, a base material layer, a coating layer interposed therebetween, a2 nd adhesive layer, and a2 nd protective layer in this order,
the layers are in contact with each other,
evaluation parameters A1 and A2 represented by the following formulas (1) and (2) satisfy the following formulas (3), (4) and (5) when the storage modulus at 25 ℃ of the 1 st adhesive layer is G '1 (kpa), the storage modulus at 25 ℃ of the 2 nd adhesive layer is G' 2(kpa), the thickness of the 1 st adhesive layer is a1(μm), and the thickness of the 2 nd adhesive layer is a2(μm),
A1＝G’1/a1 (1)
A2＝G’2/a2 (2)
A1+A2≤230 (3)
A2-A1≥0 (4)
A2≥34 (5)。
2. the laminate according to claim 1, wherein the 1 st protective layer comprises a window film having a tensile elastic modulus of 4.0GPa or more.
3. The laminate according to claim 1 or 2, wherein the 2 nd protective layer comprises a back sheet having a tensile elastic modulus of 4.0GPa or more.
4. The laminate according to any one of claims 1 to 3, wherein the interlayer coating layer comprises 1 or more layers, and each layer has a thickness of 5 μm or less.
5. The laminate of any one of claims 1 to 4, wherein the sandwiched coating comprises a polarizer layer, a phase difference layer or a touch sensor panel.
6. The laminate according to any one of claims 1 to 5, wherein each of G '1 and G' 2 is 10000kPa or less.
7. A display device comprising the laminate according to any one of claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-058916 | 2019-03-26 | ||
| JP2019058916A JP2020157578A (en) | 2019-03-26 | 2019-03-26 | Laminate and display device |
| PCT/JP2020/008303 WO2020195541A1 (en) | 2019-03-26 | 2020-02-28 | Layered body and display device |
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| CN113613880A true CN113613880A (en) | 2021-11-05 |
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| CN202080023261.9A Pending CN113613880A (en) | 2019-03-26 | 2020-02-28 | Laminate and display device |
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|---|---|
| JP (1) | JP2020157578A (en) |
| KR (1) | KR20210146324A (en) |
| CN (1) | CN113613880A (en) |
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| WO (1) | WO2020195541A1 (en) |
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| JP7042020B2 (en) | 2016-08-15 | 2022-03-25 | 日東電工株式会社 | Laminated body for flexible image display device and flexible image display device |
| JP6850601B2 (en) | 2016-12-21 | 2021-03-31 | 日東電工株式会社 | Image display device |
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- 2019-03-26 JP JP2019058916A patent/JP2020157578A/en active Pending
-
2020
- 2020-02-28 CN CN202080023261.9A patent/CN113613880A/en active Pending
- 2020-02-28 KR KR1020217032419A patent/KR20210146324A/en unknown
- 2020-02-28 WO PCT/JP2020/008303 patent/WO2020195541A1/en active Application Filing
- 2020-03-06 TW TW109107336A patent/TW202039238A/en unknown
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| JP2008165199A (en) * | 2006-12-04 | 2008-07-17 | Sumitomo Chemical Co Ltd | Elliptically polarizing plate and liquid crystal display |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2020157578A (en) | 2020-10-01 |
| TW202039238A (en) | 2020-11-01 |
| WO2020195541A1 (en) | 2020-10-01 |
| KR20210146324A (en) | 2021-12-03 |
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