Optical laminate and image display device

Abstract

The present application provides an optical laminate comprising a polarizing film and an adhesive layer, which can suppress occurrence of light leakage caused by a local load, and can suppress peeling between the adhesive layer and a layer adjacent thereto. In addition, an image display device comprising such an optical laminate is provided. The optical laminate of the embodiment of the present application comprises a polarizing film and an adhesive layer, wherein, when a puncture test is performed using a puncture tool having a curvature radius R of a front end portion of 550 μm, and a load after 15 seconds from reaching a maximum load Fp (kgf) is set as F (kgf), a displacement amount at the time of reaching the maximum load Fp (kgf) is set as L (μm), and a total thickness of the optical laminate is set as T (μm), a residual stress decay rate ΔF (%) calculated by a given formula and a maximum strain rate ΔL (%) calculated by a given formula satisfy at least one of ΔF ≤ 42 and ΔL < 80.

Description

Technical Field

[0001] This invention relates to optical laminates and image display devices. Background Technology

[0002] In image display devices (liquid crystal display devices, organic EL display devices, quantum dot display devices, etc.), due to their image formation methods, polarizing films are usually disposed on at least one side of the display unit. For polarizing films disposed on the viewable side of the image display device, the technology of providing optical components such as anti-reflection layers and anti-illumination layers on the viewable side to prevent external light from reflecting or entering the display image is well known (Patent Document 1).

[0003] Foldable image display devices, such as laptops, with the image display unit located on the inside when folded, are now widely used. However, when such an image display device is folded with a foreign object in between, a localized load caused by the foreign object is applied to the image display unit. The polarizing film and other components may be damaged due to this localized load, resulting in light leakage from the image display unit.

[0004] To suppress light leakage in the image display section caused by localized loads, it is possible to improve the resistance to loads by, for example, hardening the adhesive layer disposed on the visible side of the polarizing film. However, if the adhesive layer is hardened, its adhesion decreases, and as a result, peeling may occur between the adhesive layer and its adjacent layers.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2018-155998 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] The objective of this invention is to provide an optical laminate comprising a polarizing film and an adhesive layer, which can suppress light leakage caused by localized loads and suppress peeling between the adhesive layer and adjacent layers. Furthermore, the objective of this invention is to provide an image display device comprising such an optical laminate.

[0010] Problem Solving Methods

[0011] [1] The optical laminate of the present invention comprises a polarizing film and an adhesive layer. When a puncture test is performed using a puncture tool with a radius of curvature R of 550 μm at the front end, and the load after holding the maximum load Fp (kgf) for 15 seconds is set as F (kgf), the displacement at the maximum load Fp (kgf) is set as L (μm), and the total thickness of the optical laminate is set as T (μm), the residual stress attenuation rate ΔF (%) calculated by equation (1) and the maximum strain rate ΔL (%) calculated by equation (2) satisfy at least one of ΔF ≤ 42 and ΔL < 80.

[0012] Formula (1): ΔF=[(Fp-F) / Fp]×100

[0013] Equation (2): ΔL=(L / T)×100.

[0014] [2] In the optical laminate described in [1] above, the total thickness of the optical laminate can be 200 μm or more.

[0015] [3] In the optical laminate described in [1] or [2] above, a first optical component may be provided which is attached to the visible side of the polarizing film via a first adhesive layer.

[0016] [4] In the optical laminate described in [1] or [2] above, a second optical member may be attached to the visible side of the polarizing film via a second adhesive layer, and a first optical member may be attached to the visible side of the second optical member via a first adhesive layer.

[0017] [5] In the optical laminate described in [1] or [2] above, a third optical member may be attached to the visible side of the polarizing film via a third adhesive layer, a second optical member attached to the visible side of the third optical member via a second adhesive layer, and a first optical member attached to the visible side of the second optical member via a first adhesive layer.

[0018] [6] The image display device according to the embodiments of the present invention includes the optical laminate described in any one of [1] to [5] above.

[0019] The effects of the invention

[0020] According to embodiments of the present invention, an optical laminate comprising a polarizing film and an adhesive layer can be provided, which can suppress light leakage caused by localized loads and suppress peeling between the adhesive layer and adjacent layers. Additionally, an image display device comprising such an optical laminate can be provided. Attached Figure Description

[0021] Figure 1 This is a cross-sectional schematic diagram of an optical laminate according to one embodiment of the present invention.

[0022] Figure 2 This is a cross-sectional schematic diagram of an optical laminate according to another embodiment of the present invention.

[0023] Figure 3 This is a cross-sectional schematic diagram of an optical laminate according to another embodiment of the present invention.

[0024] Figure 4 This is a simplified diagram illustrating the maximum load Fp and load F during a puncture test. Detailed Implementation

[0025] [Regarding terminology]

[0026] In this specification, the use of the term "weight" can be understood as "mass," which is the SI unit conventionally used to express weight. The reverse is also true.

[0027] In this specification, the term "(meth)acrylic acid" refers to "acrylic acid and / or methacrylic acid", the term "(meth)acrylate" refers to "acrylate and / or methacrylate", the term "(meth)allyl" refers to "allyl and / or methylallyl", and the term "(meth)acrolein" refers to "acrolein and / or methacrolein".

[0028] In this specification, regarding refractive indices (nx, ny, nz), "nx" is the refractive index in the direction where the refractive index reaches its maximum (i.e., the slow axis direction), "ny" is the refractive index in the direction orthogonal to the slow axis (i.e., the fast axis direction), and "nz" is the refractive index in the thickness direction. In this specification, nx, ny, and nz are values ​​for light with a wavelength of 550 nm.

[0029] In this specification, regarding the in-plane phase difference (Re), "Re(λ)" refers to the in-plane phase difference of the film obtained by measuring light with a wavelength of λ nm at 23°C. For example, "Re(550)" refers to the in-plane phase difference of the film obtained by measuring light with a wavelength of 550 nm at 23°C. When the thickness of the film is set as d (nm), Re(λ) can be calculated using the formula: Re = (nx - ny) × d.

[0030] In this specification, regarding the phase difference (Rth) in the thickness direction, "Rth(λ)" is the phase difference in the thickness direction of the film obtained by measuring light with a wavelength of λnm at 23°C. For example, "Rth(550)" is the phase difference in the thickness direction of the film obtained by measuring light with a wavelength of 550nm at 23°C. When the thickness of the film is set as d (nm), Rth(λ) can be obtained by the formula: Rth=(nx-nz)×d.

[0031] In this specification, the "Nz coefficient" can be obtained by Nz = Rth / Re.

[0032] In this instruction manual, when referring to angles, unless otherwise explicitly stated, the angles include both clockwise and counterclockwise angles.

[0033] 《1. Optical Laminates》

[0034] The optical laminate of the embodiments of the present invention comprises a polarizing film and an adhesive layer. The optical laminate of the embodiments of the present invention only needs to include a polarizing film and an adhesive layer, and may include any other suitable components without impairing the effects of the present invention. It should be noted that, in this specification, the adhesive layer refers to at least one selected from adhesive layers and adhesive layers.

[0035] For the optical laminate of the present invention, when a puncture test is performed using a puncture tool with a radius of curvature R of 550 μm at the front end, the load after holding the maximum load Fp (kgf) for 15 seconds is set as F (kgf), the displacement when the maximum load Fp (kgf) is reached is set as L (μm), and the total thickness of the optical laminate is set as T (μm). The residual stress attenuation rate ΔF (%) calculated by equation (1) and the maximum strain rate ΔL (%) calculated by equation (2) satisfy at least one of ΔF ≤ 42 and ΔL < 80.

[0036] Formula (1): ΔF=[(Fp-F) / Fp]×100

[0037] Equation (2): ΔL=(L / T)×100

[0038] In embodiments of the present invention, as described above, it is sufficient to satisfy at least one of ΔF ≤ 42 and ΔL < 80. Therefore, when ΔL < 80, ΔF > 42 can be used, and when ΔF ≤ 42, ΔL > 80 can be used.

[0039] The aforementioned load F serves as an indicator of the residual stress based on the aforementioned puncture test. Specifically, if the residual stress is large, i.e., the residual stress attenuation rate ΔF is small, then after the load is removed, the deformation based on the puncture test easily returns to its original state. This led to the consideration of whether light leakage caused by localized loads could be suppressed by appropriately adjusting the residual stress attenuation rate ΔF. Through repeated research, it was found that setting ΔF below a given value can suppress light leakage caused by localized loads. Furthermore, it was considered that in the case of peeling between the adhesive layer and its adjacent layers, the load based on the aforementioned puncture test is dispersed due to the peeled portion, resulting in a smaller measured residual stress. Through repeated research, it was found that setting ΔF below a given value suppresses the occurrence of peeling between the adhesive layer and its adjacent layers.

[0040] Preferably, ΔF ≤ 90, more preferably ΔF ≤ 50, even more preferably ΔF ≤ 42, even more preferably ΔF ≤ 40, even more preferably ΔF ≤ 38, even more preferably ΔF ≤ 36, particularly preferably ΔF ≤ 34, and most preferably ΔF ≤ 32. The smaller ΔF is, the better; it can be 1 ≤ ΔF, 5 ≤ ΔF, 10 ≤ ΔF, 15 ≤ ΔF, or 20 ≤ ΔF.

[0041] The aforementioned displacement L serves as an indicator of the deformation difficulty based on the aforementioned puncture test. Specifically, if the deformation is small, i.e., the maximum strain rate ΔL is small, then damage to the polarizing film and other components caused by localized loads is reduced. This was considered during repeated studies. The results showed that even with a large residual stress attenuation rate ΔF, it was discovered that by appropriately adjusting ΔL, light leakage caused by localized loads could be suppressed.

[0042] Preferably, ΔL ≤ 98, more preferably ΔL ≤ 95, even more preferably ΔL ≤ 90, even more preferably ΔL ≤ 85, even more preferably ΔL ≤ 80, even more preferably ΔL < 80, even more preferably ΔL ≤ 77, even more preferably ΔL ≤ 75, even more preferably ΔL ≤ 70, even more preferably ΔL ≤ 65, particularly preferably ΔL ≤ 60, and most preferably ΔL ≤ 55. The smaller ΔL is, the better; it can be 1 ≤ ΔL, 10 ≤ ΔL, 20 ≤ ΔL, 30 ≤ ΔL, or 40 ≤ ΔL.

[0043] The research as described above has shown that, in the embodiments of the present invention, the effects of the present invention can be demonstrated by satisfying at least one of ΔF≤42 and ΔL<80. The optical laminate of the embodiments of the present invention can suppress the occurrence of light leakage in the image display section caused by local load and can suppress the peeling between the adhesive layer and the adjacent layer.

[0044] 1-1. Overall Structure of Optical Laminates

[0045] Figure 1 This is a cross-sectional schematic diagram of an optical laminate according to one embodiment of the present invention. Figure 1 The optical laminate 100 shown includes: a polarizing film 10, and a first optical member 31 bonded to the visible side of the polarizing film 10 via a first adhesive layer 21. Figure 1 As shown, a first phase retardation film 40 and a second phase retardation film 50 can be sequentially provided on the opposite side of the visible side of the polarizing film 10, starting from the polarizing film 10 side. Figure 1 As shown, the optical laminate 100 may further include a panel-side adhesive layer 60. The panel-side adhesive layer 60 is disposed on the side of the second retardation film 50 opposite to the first retardation film 40. If the optical laminate 100 includes the panel-side adhesive layer 60, the optical laminate 100 can be adhered to the image display unit via the panel-side adhesive layer 60. That is, Figure 1 The optical laminate 100 shown has the following structure from the visible side: a first optical component 31, a first adhesive layer 21, a polarizing film 10, a first retardation film 40, a second retardation film 50, and a panel-side adhesive layer 60.

[0046] Figure 2 This is a cross-sectional schematic diagram of an optical laminate according to another embodiment of the present invention. Figure 2 The optical laminate 100 shown includes a polarizing film 10, a second optical member 32 bonded to the visible side of the polarizing film 10 via a second adhesive layer 22, and a first optical member 31 bonded to the visible side of the second optical member 32 via a first adhesive layer 21. Figure 2 As shown, a first phase retardation film 40 and a second phase retardation film 50 can be further provided sequentially from the polarization film 10 side on the opposite side of the visible side of the polarization film 10. For example... Figure 2 As shown, the optical laminate 100 may further include a panel-side adhesive layer 60. The panel-side adhesive layer 60 is disposed on the side of the second retardation film 50 opposite to the first retardation film 40. If the optical laminate 100 includes the panel-side adhesive layer 60, the optical laminate 100 can be adhered to the image display unit via the panel-side adhesive layer 60. That is, Figure 2 The optical laminate 100 shown has the following structure from the visible side: a first optical component 31, a first adhesive layer 21, a second optical component 32, a second adhesive layer 22, a polarizing film 10, a first retardation film 40, a second retardation film 50, and a panel-side adhesive layer 60.

[0047] Figure 3This is a cross-sectional schematic diagram of an optical laminate according to another embodiment of the present invention. Figure 3 The optical laminate 100 shown includes a polarizing film 10, a third optical member 33 bonded to the visible side of the polarizing film 10 via a third adhesive layer 23, a second optical member 32 bonded to the visible side of the third optical member 33 via a second adhesive layer 22, and a first optical member 31 bonded to the visible side of the second optical member 32 via a first adhesive layer 21. Figure 3 As shown, a first phase retardation film 40 and a second phase retardation film 50 can be further provided sequentially from the polarization film 10 side on the opposite side of the visible side of the polarization film 10. For example... Figure 3 As shown, the optical laminate 100 may further include a panel-side adhesive layer 60. The panel-side adhesive layer 60 is disposed on the side of the second retardation film 50 opposite to the first retardation film 40. If the optical laminate 100 includes the panel-side adhesive layer 60, the optical laminate 100 can be adhered to the image display unit via the panel-side adhesive layer 60. That is, Figure 3 The optical laminate 100 shown has the following components in sequence from the visible side: a first optical component 31, a first adhesive layer 21, a second optical component 32, a second adhesive layer 22, a third optical component 33, a third adhesive layer 23, a polarizing film 10, a first retardation film 40, a second retardation film 50, and a panel-side adhesive layer 60.

[0048] The optical laminate of the embodiments of the present invention only needs to include a polarizing film and an adhesive layer. As its structure, any suitable configuration can be adopted, with the above-described configuration being representative. Figures 1-3 The configuration shown is particularly preferred. Figure 1 The structure shown. If it is... Figure 1 The configuration shown (the configuration of the first optical component 31 / the first adhesive layer 21 / the polarizing film 10) reduces the number of components between the first optical component 31 and the polarizing film 10, thus becoming advantageous from both cost and environmental perspectives. For example, it is preferable to have fewer lamination steps in the optical laminate. Figure 1 The structure shown.

[0049] The total thickness of the optical laminate 100 in embodiments of the present invention can be any suitable total thickness without impairing the effects of the present invention. From the perspective of further demonstrating the effects of the present invention, the total thickness of the optical laminate in embodiments of the present invention is preferably 200 μm or more, more preferably 200 μm to 330 μm, even more preferably 220 μm to 310 μm, particularly preferably 250 μm to 300 μm, and most preferably 260 μm to 290 μm.

[0050] In the optical laminate 100 of the embodiments of the present invention, the thickness of the first adhesive layer 21 can be any suitable total thickness within a range that does not impair the effects of the present invention. From the perspective of further demonstrating the effects of the present invention, the thickness of the first adhesive layer 21 is preferably 5 μm to 200 μm, more preferably 5 μm to 170 μm, even more preferably 5 μm to 150 μm, particularly preferably 5 μm to 130 μm, and most preferably 5 μm to 110 μm.

[0051] In the optical laminate 100 of the embodiments of the present invention, the thickness of the second adhesive layer 22 can be any suitable total thickness within a range that does not impair the effects of the present invention. From the perspective of further demonstrating the effects of the present invention, the thickness of the second adhesive layer 22 is preferably 5 μm to 20 μm, more preferably 5 μm to 17 μm, further preferably 5 μm to 16 μm, particularly preferably 5 μm to 15 μm, and most preferably 5 μm to 14 μm.

[0052] In the optical laminate 100 of the embodiments of the present invention, the thickness of the third adhesive layer 23 can be any suitable total thickness within a range that does not impair the effects of the present invention. From the perspective of further demonstrating the effects of the present invention, the thickness of the third adhesive layer 23 is preferably 5 μm to 20 μm, more preferably 5 μm to 17 μm, further preferably 5 μm to 16 μm, particularly preferably 5 μm to 15 μm, and most preferably 5 μm to 14 μm.

[0053] The refractive index characteristics of the first retardation film 40 can be any suitable refractive index characteristic without impairing the effects of the present invention. Preferably, the refractive index characteristics of the first retardation film 40 are those where nx > ny > nz. With such refractive index characteristics, the optical laminate 100 can be endowed with the desired optical compensation function.

[0054] The refractive index characteristics of the second retardation film 50 can be any suitable characteristic without impairing the effects of the present invention. Preferably, the refractive index characteristics of the second retardation film 50 are in the range of nz > nx > ny. With such refractive index characteristics, the optical laminate 100 can be endowed with the desired optical compensation function.

[0055] The following describes the constituent elements of optical laminates.

[0056] 1-2. Polarizing Films

[0057] The polarizing film 10 typically includes a polarizer and a protective layer disposed on the visible side of the polarizer. The protective layer is typically attached to the visible side of the polarizer via any suitable adhesive layer (not shown). That is, the polarizing film 10 may consist of a polarizer, an adhesive layer, and a protective layer.

[0058] If we Figure 1 Taking the embodiment shown in the diagram as an example, the protective layer is located between the polarizer and the first adhesive layer 21, and is in contact with the first adhesive layer 21. The protective layer can be pressure-sensitively bonded to the first adhesive layer 21. The polarizing film 1 may also have a second protective layer on the side of the polarizer opposite to the visible side.

[0059] <1-2-a. Polarizer>

[0060] As a polarizer, any suitable polarizer can be used. For example, the resin film forming the polarizer can be a single-layer resin film or a laminate of two or more layers.

[0061] As a specific example of a polarizer composed of a single-layer resin film, a polarizer obtained by performing iodine staining and stretching treatment (typically uniaxial stretching) on ​​a PVA-type resin film can be cited. Iodine staining can be performed, for example, by immersing the PVA-type resin film in an aqueous iodine solution. The stretching magnification is preferably 3 to 7 times. Stretching can be performed after staining or during staining. Alternatively, staining can be performed after stretching. The PVA-type resin film can be subjected to swelling treatment, cross-linking treatment, cleaning treatment, drying treatment, etc., as needed. For example, by immersing the PVA-type resin film in water for washing before staining, not only can dirt and anti-blocking agents on the surface of the PVA-type resin film be cleaned, but the PVA-type resin film can also swell to prevent uneven staining.

[0062] Specific examples of polarizers composed of two or more layers include polarizers composed of a resin substrate and a PVA-based resin layer (PVA-based resin film) laminated on the resin substrate, or polarizers composed of a resin substrate and a PVA-based resin layer coated on the resin substrate. A polarizer composed of a resin substrate and a PVA-based resin layer coated on the resin substrate can be manufactured, for example, by coating a PVA-based resin solution onto a resin substrate and drying it to form a PVA-based resin layer on the resin substrate, thus obtaining a laminate of the resin substrate and the PVA-based resin layer; stretching and dyeing the laminate to form a polarizer from the PVA-based resin layer. In a preferred embodiment, a polyvinyl alcohol resin layer comprising a halide and a polyvinyl alcohol resin is formed on one side of the resin substrate. Stretching can typically include immersing the laminate in an aqueous boric acid solution for stretching. Furthermore, stretching may, as needed, include stretching the laminate in a gas atmosphere at a high temperature (e.g., above 95°C) before stretching in a boric acid aqueous solution. In a preferred embodiment, the laminate is subjected to a drying shrinkage treatment, which causes it to shrink by more than 2% in the width direction by heating while being transported along its length. Typically, the laminate is subjected to assisted stretching in a gas atmosphere, dyeing, stretching in an aqueous solution, and drying shrinkage treatment sequentially. By introducing assisted stretching, the crystallinity of PVA can be improved even when PVA is coated on a thermoplastic resin, resulting in high optical properties. Additionally, by simultaneously improving the orientation of PVA beforehand, problems such as decreased orientation and dissolution of PVA during subsequent dyeing and stretching processes and immersion in water can be prevented, further achieving high optical properties. Furthermore, when the PVA resin layer is immersed in a liquid, compared to the case where the PVA resin layer does not contain halides, the orientation disorder of polyvinyl alcohol molecules and the reduction of orientation can be suppressed. Therefore, the optical properties of the polarizer obtained by immersing the laminate in a liquid through processes such as dyeing and stretching in an aqueous solution can be improved. Furthermore, by using a drying shrinkage process to shrink the laminate in the width direction, the optical properties can be further improved. The resulting resin substrate / polarizer laminate can be used directly (i.e., the resin substrate can be used as a protective layer for the polarizer), or the resin substrate can be peeled off from the resin substrate / polarizer laminate, and any suitable protective layer corresponding to the purpose can be laminated on the peeled surface for use. Detailed descriptions of such a method for manufacturing a polarizer are provided, for example, in Japanese Patent Application Publication No. 2012-73580 and Japanese Patent No. 6470455. The entire contents of these publications are incorporated herein by reference.

[0063] The polarizer is preferably composed of two or more layers, and more preferably a laminate composed of a resin substrate and a PVA-type resin layer coated on the resin substrate.

[0064] The thickness of the polarizer can be any suitable thickness without impairing the effects of the present invention. From the perspective of further demonstrating the effects of the present invention, the thickness of the polarizer is preferably 1 μm to 15 μm, more preferably 2 μm to 12 μm, even more preferably 3 μm to 10 μm, and particularly preferably 3 μm to 8 μm.

[0065] The polarizer preferably exhibits absorption dichroism at any wavelength within the range of 380 nm to 780 nm. The single-unit transmittance of the polarizer is, for example, 41.5% to 46.0%, preferably 43.0% to 46.0%, more preferably 44.5% to 46.0%. The degree of polarization of the polarizer 21 is preferably 97.0% or higher, more preferably 99.0% or higher, and even more preferably 99.9% or higher.

[0066] <1-2-b. Protective Layer>

[0067] The protective layer can be formed from any suitable film that can be used as a protective layer for a polarizer. Examples of materials that form the main component of the aforementioned film include: cellulose resins such as cellulose triacetate (TAC), polyester resins, polyvinyl alcohol resins, polycarbonate resins, polyamide resins, polyimide resins, polyethersulfone resins, polysulfone resins, polystyrene resins, polynorbornene resins, polyolefin resins, (meth)acrylic acid resins, acetate resins, and other transparent resins. Additionally, examples of materials that form the main component of the aforementioned film include thermosetting resins or UV-curing resins such as (meth)acrylic acid, urethane, (meth)acrylate urethane, epoxy, and silicone. Furthermore, examples of materials that form the main component of the aforementioned film include: glassy polymers such as siloxane polymers, and polymer films described in Japanese Patent Application Publication No. 2001-343529 (WO01 / 37007). Alternatively, as the main component of the above-mentioned membrane, a resin composition containing a thermoplastic resin having substituted or unsubstituted imide groups in the side chain, and a thermoplastic resin having substituted or unsubstituted phenyl and nitrile groups in the side chain can be used. Examples include resin compositions having alternating copolymers formed from isobutylene and N-methylmaleimide, and acrylonitrile-styrene copolymers. The membrane can be, for example, an extruded product of such a resin composition.

[0068] As one embodiment of the protective layer, it comprises a (meth)acrylic resin. As the (meth)acrylic resin, for example, a (meth)acrylic resin having a glutarimide structure can be used. (Meth)acrylic resins having a glutarimide structure are described, for example, in Japanese Patent Application Publication Nos. 2006-309033, 2006-317560, 2006-328329, 2006-328334, 2006-337491, 2006-337492, 2006-337493, 2006-337569, 2007-009182, 2009-161744, and 2010-284840. These publications are incorporated herein by reference.

[0069] The thickness of the protective layer can be any suitable thickness without impairing the effects of the present invention. From the perspective of further demonstrating the effects of the present invention, the thickness of the protective layer is typically 300 μm or less, preferably 3 μm to 100 μm, more preferably 5 μm to 80 μm, and even more preferably 10 μm to 60 μm. It should be noted that when the protective layer has undergone surface treatment, the thickness of the protective layer includes the thickness of the layer formed by the surface treatment (surface treatment layer).

[0070] 1-3. First Adhesive Layer

[0071] like Figures 1-3 As shown, the first adhesive layer 21 is disposed on the visible side of the polarizing film 10, and the first optical component 31 is attached to the first adhesive layer 21 on the opposite side of the polarizing film 10 as viewed from the first adhesive layer 21.

[0072] The first adhesive layer can be either an adhesive layer (first adhesive layer) or a bonding agent layer (first bonding agent layer). From the perspective of excellent thickness accuracy (low thickness deviation) of the formed adhesive layer or bonding agent layer, the first adhesive layer is preferably an adhesive layer (first adhesive layer).

[0073] The first adhesive layer is typically composed of a first adhesive, which is formed from a photocurable adhesive composition (I) or a solvent-based adhesive composition (II). The photocurable adhesive composition (I) is typically an adhesive composition in which the first adhesive is formed by irradiation with light. The solvent-based adhesive composition (II) is typically an adhesive composition comprising a base polymer and a crosslinking agent, and in which the first adhesive is formed by crosslink-based curing.

[0074] <1-3-a. First adhesive layer obtained from light-curable adhesive composition (I)>

[0075] One embodiment of the first adhesive layer is a first adhesive layer obtained from a photocurable adhesive composition (I). In this embodiment, the first adhesive layer is composed of a first adhesive formed from the photocurable adhesive composition (I).

[0076] The photocurable adhesive composition (I) includes, for example, at least one selected from monomer components and a portion of polymers of the monomer components.

[0077] The monomer component preferably includes (meth)acrylic monomers. That is, the photocurable adhesive composition (I) preferably includes at least one selected from (meth)acrylic monomers and a portion of polymers of the (meth)acrylic monomer.

[0078] The total content of the monomer components and a portion of the polymers in the light-curing adhesive composition (I) is preferably 50% by weight or more, more preferably 60% by weight or more, even more preferably 70% by weight or more, and particularly preferably 80% by weight or more.

[0079] Examples of (meth)acrylic monomers include alkyl (meth)acrylates. Alkyl (meth)acrylates can be a single type or two or more. A representative example of an alkyl (meth)acrylate is an alkyl (meth)acrylate in which the alkyl group of the alkyl ester moiety has 1 to 20 carbon atoms. The number of carbon atoms in the alkyl group is preferably 1 to 12, more preferably 1 to 10, further preferably 1 to 8, and particularly preferably 2 to 6. The alkyl group can be linear or branched. Specific examples of alkyl methacrylates include: methyl methacrylate, ethyl methacrylate, propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, sec-butyl methacrylate, tert-butyl methacrylate, isobutyl methacrylate, n-pentyl methacrylate, isopentyl methacrylate, n-hexyl methacrylate, isohexyl methacrylate, isoheptyl methacrylate, 2-ethylhexyl methacrylate, n-octyl methacrylate, isooctyl methacrylate, n-nonyl methacrylate, isononyl methacrylate, n-decyl methacrylate, isodecyl methacrylate, n-dodecyl methacrylate (laurate methacrylate), n-tridecyl methacrylate, n-tetradecyl methacrylate, n-pentadecanyl methacrylate, n-hexadecyl methacrylate, n-heptadecyl methacrylate, and n-octadecyl methacrylate. Among these, from the perspective of further demonstrating the effects of the present invention, alkyl (meth)acrylate is preferred, n-butyl (meth)acrylate is more preferred, and n-butyl acrylate is more preferred.

[0080] The proportion of alkyl (meth)acrylate in the total monomer content (including monomers consumed to form part of the polymer) is preferably 40% to 100% by weight, more preferably 50% to 99.9% by weight, further preferably 55% to 99% by weight, and particularly preferably 60% to 99% by weight. In one embodiment, this proportion can be 65% to 99% by weight, 70% to 99% by weight, 75% to 99% by weight, 80% to 99% by weight, 85% to 99% by weight, 90% to 99% by weight, 91% to 99% by weight, 92% to 98% by weight, or 93% to 97% by weight. In another embodiment, this proportion can be 60% to 95% by weight, 65% to 90% by weight, 68% to 88% by weight, or 70% to 85% by weight.

[0081] The monomer component may include carboxyl-containing monomers. There may be only one type of carboxyl-containing monomer, or there may be two or more. Examples of carboxyl-containing monomers include: (meth)acrylic acid, carboxyethyl (meth)acrylic acid, carboxypentyl (meth)acrylic acid, itaconic acid, maleic acid, fumaric acid, and crotonic acid, preferably (meth)acrylic acid, more preferably acrylic acid. The proportion of carboxyl-containing monomers in the total monomer component (including monomers consumed to form part of the polymer) is preferably 0% to 10% by weight, more preferably 0.1% to 10% by weight, further preferably 1% to 9% by weight, particularly preferably 2% to 8% by weight, and most preferably 3% to 7% by weight.

[0082] The monomer component may include hydroxyl-containing monomers. There may be only one type of hydroxyl-containing monomer, or there may be two or more. Examples of hydroxyl-containing monomers include: 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, 12-hydroxylaurate (meth)acrylate, and methyl (4-hydroxymethylcyclohexyl)acrylate, which are hydroxyl-containing (meth)acrylates with 1 to 20 carbon atoms. 2-hydroxyethyl (meth)acrylate and 4-hydroxybutyl (meth)acrylate are preferred. The proportion of hydroxyl-containing monomers in the total monomer component (including monomer components consumed to form a portion of the polymer) is preferably 0% to 20% by weight. In one embodiment, this proportion may be 0.01% to 15% by weight, 0.03% to 10% by weight, 0.05% to 7% by weight, or 0.05% to 5% by weight. In another embodiment, the content ratio can be 0% to 15% by weight, 0% to 10% by weight, 0% to 7% by weight, or 0% to 5% by weight.

[0083] The monomer component may contain an ether-containing monomer. There may be only one ether-containing monomer or two or more. Examples of ether-containing monomers include alkoxy-containing monomers. Examples of alkoxy-containing monomers include the epoxide alkane adduct shown in chemical formula (1) below. In chemical formula (1), R... 1 R is a hydrogen atom or a methyl group. 2 It is an alkyl group. R 2 It can be linear or branched, but linear is preferred. 2 Specific examples are methyl and ethyl. In chemical formula (1), n ​​is an integer from 1 to 30, preferably an integer from 1 to 12, and more preferably an integer from 1 to 5.

[0084] [Chemical Formula 1]

[0085]

[0086] Specific examples of the alkylene oxide adducts shown in chemical formula (1) include: 2-methoxyethyl acrylate, 2-ethoxyethyl acrylate, 2-(2-ethoxyethoxy)ethyl acrylate, methoxytriethylene glycol (meth)acrylate, methoxypolyethylene glycol (meth)acrylate, and preferably 2-methoxyethyl acrylate (MEA).

[0087] The ether-containing monomer is not limited to the above-mentioned epoxide alkane adducts. The ether-containing monomer may have a cyclic structure, and this cyclic structure may contain an ether group. Examples of cyclic structures containing an ether group include tetrahydrofuran rings and dihydrofuran rings. Alkyl rings, etc. Specific examples of ether-containing monomers with cyclic structures include cyclic trimethylolpropane methyl acetal (meth)acrylate and tetrahydrofurfuryl (meth)acrylate.

[0088] The proportion of ether-containing monomers in the total monomer content (including monomers consumed to form part of the polymer) can, for example, be 0% to 20% by weight. In one embodiment, this proportion can be 0.01% to 15% by weight, 0.03% to 10% by weight, 0.05% to 7% by weight, or 0.05% to 5% by weight. In another embodiment, this proportion can be 0% to 15% by weight, 0% to 10% by weight, 0% to 7% by weight, or 0% to 5% by weight.

[0089] The monomer component may include amide-containing monomers. There may be only one type of amide-containing monomer, or there may be two or more types. Amide-containing monomers are compounds whose structure contains an amide group and polymerizable unsaturated double bonds such as (meth)acryloyl groups and vinyl groups. The preferred amide-containing monomer is an amide-containing (meth)acrylate.

[0090] Examples of amide-containing monomers include: (meth)acrylamide, N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-isopropylacrylamide, N-methyl(meth)acrylamide, N-butyl(meth)acrylamide, N-hexyl(meth)acrylamide, N-hydroxymethyl(meth)acrylamide, N-hydroxymethyl-N-propyl(meth)acrylamide, aminomethyl(meth)acrylamide, aminoethyl(meth)acrylamide, mercaptomethyl(meth)acrylamide, mercaptoethyl(meth)acrylamide, and other acrylamide monomers; N-(meth)acryloylmorpholine, N-(meth)acryloylpiperidine, N-(meth)acryloylpyrrolidine, and other N-acryloyl heterocyclic monomers; and N-vinylpyrrolidone, N-vinyl-ε-caprolactam, and other N-vinyl lactam monomers.

[0091] The proportion of amide-containing monomers in the total monomer content (including monomers consumed to form part of the polymer) is, for example, 0% to 50% by weight. In one embodiment, this proportion can be 0.1% to 45% by weight, 0.1% to 40% by weight, 0.1% to 35% by weight, 0.1% to 30% by weight, 0.1% to 25% by weight, 1% to 20% by weight, or 5% to 15% by weight. In another embodiment, this proportion can be 1% to 45% by weight, 5% to 40% by weight, 8% to 35% by weight, 10% to 30% by weight, or 10% to 25% by weight.

[0092] The monomer component may include other comonomers. These other comonomers may be a single type or two or more. Examples of other comonomers include: maleic anhydride, itaconic anhydride, and other anhydride-containing monomers; caprolactone adducts of acrylic acid; sulfonic acid-containing monomers such as allyl sulfonic acid, 2-(meth)acrylamide-2-methylpropanesulfonic acid, (meth)acrylamide propanesulfonic acid, and (meth)acrylate sulfonylpropyl ester; phosphate-containing monomers such as 2-hydroxyethylacryloyl phosphate; (meth)acrylate aminoethyl ester, (meth)acrylate N,N-dimethylaminoethyl ester, (meth)acrylate tert-butylaminoethyl ester, and (meth)acrylate alkylaminoalkyl esters; N-(meth)acryloyloxymethylene Succinimide monomers such as succinimide, N-(meth)acryloyl-6-oxyhexamethylenesuccinimide, and N-(meth)acryloyl-8-oxyoctamethylenesuccinimide; maleimide monomers such as N-cyclohexylmaleimide, N-isopropylmaleimide, N-laurylmaleimide, and N-phenylmaleimide; and itconimide monomers such as N-methylitaconimide, N-ethylitaconimide, N-butylitaconimide, N-octylitaconimide, N-2-ethylhexylitaconimide, N-cyclohexylitaconimide, and N-laurylitaconimide. Conimide monomers; vinyl monomers such as vinyl acetate and vinyl propionate; cyanoacrylate monomers such as acrylonitrile and methacrylonitrile; epoxy-containing (meth)acrylates such as glycidyl acrylate; diol (meth)acrylates such as carbitol acrylate, ethyl carbitol acrylate, polyethylene glycol (meth)acrylate, polypropylene glycol (meth)acrylate, methoxyethylene glycol (meth)acrylate, and methoxypolypropylene glycol (meth)acrylate; tetrahydrofurfuryl acrylate, fluoro(meth)acrylates, and organosilicones. (Meth)acrylates, etc.; silane monomers containing silicon atoms, such as 3-acryloyloxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 4-vinylbutyltrimethoxysilane, 4-vinylbutyltriethoxysilane, 8-vinyloctyltrimethoxysilane, 8-vinyloctyltriethoxysilane, 10-methacryloyloxydecyltrimethoxysilane, 10-acryloyloxydecyltrimethoxysilane, 10-methacryloyloxydecyltriethoxysilane, 10-acryloyloxydecyltriethoxysilane, etc.

[0093] The proportion of other comonomers in the total monomer content (including monomers consumed to form part of the polymer) is, for example, 0% to 10% by weight, 0% to 5% by weight, or 0% to 3% by weight.

[0094] The photocurable adhesive composition (I) may contain a portion of the polymers of each of the aforementioned monomers. The portion of the polymer can be any polymer among homopolymers and copolymers. The portion of the polymer can contribute to the stable formation of the coating layer described later by moderately increasing the viscosity of the photocurable adhesive composition (I).

[0095] The photocurable adhesive composition (I) may contain a photopolymerization initiator. Any suitable photopolymerization initiator may be used without impairing the effects of the present invention. Examples of photopolymerization initiators include photoradiogenin generators that generate free radicals upon exposure to visible light and / or ultraviolet light with wavelengths shorter than 450 nm. There may be only one photopolymerization initiator or two or more.

[0096] Examples of photopolymerization initiators include: α-keto alcohols such as 4-(2-hydroxyethoxy)phenyl(2-hydroxy-2-propyl)one, α-hydroxy-α,α'-dimethylacetophenone, 2-methyl-2-hydroxyphenylacetone, and 1-hydroxycyclohexylphenyl ketone; acetophenone compounds such as methoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxyacetophenone, and 2-methyl-1-[4-(methylthio)-phenyl]-2-morpholinopropane-1; benzoin ether compounds such as benzoin ethyl ether, benzoin isopropyl ether, and anisolein methyl ether; and benzoin bis(ethyl) ether. Ketals such as methyl ether; aromatic sulfonyl chlorides such as 2-naphthalenesulfonyl chloride; photoactive oximes such as 1-phenyl-1,1-propanedione-2-(O-ethoxycarbonyl)oxime; benzophenones such as benzoylbenzoic acid and 3,3'-dimethyl-4-methoxybenzophenone; thioxanthones such as 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-dichlorothioxanthone, 2,4-diethylthioxanthone, and 2,4-diisopropylthioxanthone; camphorquinone; haloketones; acylphosphine oxides; acylphosphonates.

[0097] As a photopolymerization initiator, a photopolymerization initiator having two or more (preferably two to five) photodegradable groups can be used. A photodegradable group refers to a functional group that absorbs irradiated active energy rays to generate a free radical; specific examples include ketone groups, haloalkyl groups, ester groups, sulfone groups, peroxy groups, etc.

[0098] Examples of photopolymerization initiators having two or more photodegradable groups include: 2-hydroxy-1-[4-[4-(2-hydroxy-2-methylpropanoyl)benzyl]phenyl]-2-methylpropane-1-one (commercially available, for example, under the trade name "Omnirad127D", manufactured by IGM Resins BV), 1-[4-(4-benzoylphenylthio)phenyl]-2-methyl-2-(4-methylphenylsulfonyl)propane-1-one (commercially available, for example, under the trade name "ESACURE 1001M", manufactured by IGM Resins BV), methyl benzoylformate (commercially available, for example, under the trade name "SPEEDCURE MBF", manufactured by ARKEMA Sartomer), and O-ethoxyimino-1-phenylpropane-1-one (commercially available, for example, under the trade name "SPEEDCURE"). PDO (manufactured by ARKEMASartomer), oligomeric [2-hydroxy-2-methyl-4-(1-methylvinyl)phenyl]acetone (as a commercially available product, for example, under the trade name "ESACURE KIP150", manufactured by IGM Resins BV).

[0099] Compounds containing phosphorus and / or nitrogen atoms can be used as photopolymerization initiators. Examples of such photopolymerization initiators include: 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropane-1-one (commercially available, for example under the trade name "Omnirad907", manufactured by IGM Resins BV), 2-benzyl-2-(dimethylamino)-4'-morpholinobutyrylphenyl (commercially available, for example under the trade name "Omnirad369", manufactured by IGM Resins BV), 2-dimethylamino-2-(4-methylbenzyl)-1-(4-morpholino-4-yl-phenyl)butane-1-one (commercially available, for example under the trade name "Omnirad379", manufactured by IGM Resins BV), and bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide (commercially available, for example under the trade name "Omnirad819", manufactured by IGM Resins BV). (BV manufactured), 2,4,6-trimethylbenzoyl diphenylphosphine oxide (as a commercially available product, for example, under the trade name "OmniradTPO", manufactured by IGM Resins BV), 1,2-octanedione-1-[4-(phenylthio)phenyl-2-(O-benzoyl oxime)] (as a commercially available product, for example, under the trade name "OmniradOXE01", manufactured by IGM Resins BV), acetone-1-[9-ethyl-6-(2-methylbenzoyl)-9H-carbazole-3-yl]-1-(O-acetyl oxime) (as a commercially available product, for example, under the trade name "OmniradOXE02", manufactured by IGM Resins BV).

[0100] The content of the photopolymerization initiator in the photocurable adhesive composition (I) can be any suitable amount without impairing the effects of the present invention. As such a content of photopolymerization initiator, it is, for example, 0.02 parts by weight to 10 parts by weight, preferably 0.05 parts by weight to 5 parts by weight, relative to 100 parts by weight of the total monomer components (including monomer components consumed to form a portion of the polymer).

[0101] The photocurable adhesive composition (I) may contain a crosslinking agent. There may be only one type of crosslinking agent or two or more.

[0102] Examples of crosslinking agents include: polyfunctional (meth)acrylates (ester compounds formed by polyols and (meth)acrylic acid), allyl (meth)acrylate, vinyl (meth)acrylate, divinylbenzene, epoxy (meth)acrylate, polyester (meth)acrylate, urethane (meth)acrylate, di(meth)acrylate, and di(meth)hexyl acrylate.

[0103] Examples of polyfunctional (meth)acrylates include: difunctional (meth)acrylates, trifunctional (meth)acrylates, and polyfunctional (meth)acrylates with four or more functions.

[0104] Examples of difunctional (meth)acrylates include: ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, etc. (poly)ethylene glycol dimethacrylates; propylene glycol dimethacrylate, dipropylene glycol dimethacrylate, tripropylene glycol dimethacrylate, tetrapropylene glycol dimethacrylate, etc. (poly)propylene glycol dimethacrylates; neopentyl glycol dimethacrylate... Acrylic esters; Pentaerythritol di(meth)acrylate; 1,2-ethylene glycol di(meth)acrylate; 1,6-hexanediol di(meth)acrylate; 1,9-nonanediol diacrylate (NDDA); 1,12-dodecanediol di(meth)acrylate; glycerol di(meth)acrylate; stearic acid modified pentaerythritol di(meth)acrylate; dicyclopentadienyl di(meth)acrylate; di(meth)acryloyl isocyanurate; ethoxylated bisphenol A di(meth)acrylate.

[0105] Examples of trifunctional (meth)acrylates include: pentaerythritol tri(meth)acrylate, trimethylolpropane tri(meth)acrylate, tetramethylolmethane tri(meth)acrylate, and tri((meth)acryloyloxyethyl)isocyanurate.

[0106] Examples of polyfunctional (meth)acrylates with four or more functions include: di(trimethylolpropane)tetra(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol hexa(meth)acrylate, dipentaerythritol monohydroxypenta(meth)acrylate, and alkyl-modified dipentaerythritol penta(meth)acrylate.

[0107] A preferred embodiment of the multifunctional (meth)acrylate is 1,9-nonanediol di(meth)acrylate (e.g., 1,9-nonanediol diacrylate (NDDA)) or di(trimethylolpropane)tetra(meth)acrylate. As di(trimethylolpropane)tetra(meth)acrylate, it can be commercially available under the trade name "PHOTOMER4306" (manufactured by IGMResins BV).

[0108] As an epoxy (meth)acrylate, it can be marketed under the trade name "EBECRYL3700" (manufactured by Daicel-Allnex Co., Ltd.).

[0109] As a polyester (meth)acrylate, it can be sold under the trade name "PHOTOMER5429" (manufactured by IGMResins BV).

[0110] As a carbamate (meth)acrylate, it can be marketed under the trade name "EBECRYL4859" (manufactured by Daicel-Allnex Co., Ltd.).

[0111] Multifunctional oligomers can be used as crosslinking agents. Only one type of multifunctional oligomer can be used, or two or more can be used. Examples of multifunctional oligomers include: urethane (meth)acrylate oligomers (oligomers having a urethane backbone and two or more (meth)acryloyl groups), epoxy (meth)acrylate oligomers (oligomers having an epoxy backbone and two or more (meth)acryloyl groups), and organosilicon (meth)acrylate oligomers (oligomers having a siloxane backbone and two or more (meth)acryloyl groups). Uramate (meth)acrylate oligomers are preferred as multifunctional oligomers. Commercially available urethane (meth)acrylate oligomers include, for example, those manufactured by Negye Kogyo Co., Ltd. under the trade names "ART RESIN UN-333", "ART RESIN UN-350", "ART RESIN UN-353", "ART RESIN UN-5500", and "ART RESIN UN-5590".

[0112] The weight-average molecular weight (Mw) of the multifunctional oligomers is, for example, 1000-50000, 5000-40000, 8000-30000, 11000-25000, 14000-23000, or 16000-22000. Such a configuration is preferred from the viewpoint of appropriately adjusting the viscoelasticity (e.g., shear modulus and loss tangent) of the base polymer. The weight-average molecular weight (Mw) in this specification is a value determined based on GPC (gel permeation chromatography) (converted to polystyrene).

[0113] From the perspective of further demonstrating the effects of the present invention, as a crosslinking agent, it is preferable to select at least one selected from polyfunctional (meth)acrylates, epoxy (meth)acrylates, polyester (meth)acrylates, urethane (meth)acrylates, and polyfunctional oligomers.

[0114] As a crosslinking agent, an isocyanate crosslinking agent can be used in combination with the above-mentioned crosslinking agent. Such an isocyanate crosslinking agent can be a single type or two or more types. The proportion of isocyanate crosslinking agent in the total crosslinking agent is preferably 0% to 50% by weight, more preferably 0% to 30% by weight, further preferably 0% to 10% by weight, particularly preferably 0% to 5% by weight, and most preferably 0% to 1% by weight.

[0115] As the isocyanate crosslinking agent, any suitable isocyanate crosslinking agent currently known in general can be used. As the isocyanate crosslinking agent, a compound having at least two isocyanate groups (isocyanate compound) can be used. The number of isocyanate groups contained in the isocyanate compound is preferably 3 or more. There is no particular upper limit to the number of isocyanate groups, for example, 5. Examples of isocyanate compounds include aromatic isocyanate compounds, alicyclic isocyanate compounds, and aliphatic isocyanate compounds.

[0116] Examples of aromatic isocyanate compounds include: phenyl diisocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 2,2'-diphenylmethane diisocyanate, 4,4'-diphenylmethane diisocyanate, 4,4'-toluidine diisocyanate, 4,4'-diphenyl ether diisocyanate, 4,4'-diphenyl diisocyanate, 1,5-naphthalene diisocyanate, and phenyl dimethyl diisocyanate.

[0117] Examples of alicyclic isocyanate compounds include: 1,3-cyclopentene diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, hydrogenated phenyl dimethyl diisocyanate, hydrogenated toluene diisocyanate, and hydrogenated tetramethylphenyl dimethyl diisocyanate.

[0118] Examples of aliphatic isocyanate compounds include: trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate (HDI), pentamethylene diisocyanate (PDI), 1,2-propylidene diisocyanate, 1,3-butylidene diisocyanate, dodecamethylene diisocyanate, and 2,4,4-trimethylhexamethylene diisocyanate.

[0119] Examples of isocyanate crosslinking agents include polymers (dimers, trimers, pentamers, etc.) of the aforementioned isocyanate compounds, adducts obtained by addition reactions with polyols such as trimethylolpropane, urea-modified compounds, biuret-modified compounds, urethane-modified compounds, isocyanurate-modified compounds, carbodiimide-modified compounds, and urethane prepolymers obtained by addition reactions with polyether polyols, polyester polyols, acrylic polyols, polybutadiene polyols, and polyisoprene polyols.

[0120] Isocyanate crosslinking agents may include derivatives selected from at least one of alicyclic isocyanate compounds and aliphatic isocyanate compounds. Isocyanate crosslinking agents are particularly preferably selected from at least one of pentamethylene diisocyanate (PDI) crosslinking agents (PDI and its derivatives) and hexamethylene diisocyanate (HDI) crosslinking agents (HDI and its derivatives). Specific examples of PDI crosslinking agents include isocyanurate-modified PDI. Specific examples of HDI crosslinking agents include isocyanurate-modified HDI and biuret-modified HDI.

[0121] The content of the crosslinking agent in the photocurable adhesive composition (I) can be appropriately set according to the molecular weight, number of functional groups, etc. From the perspective of further demonstrating the effects of the present invention, the content of the crosslinking agent is preferably 0.01 to 20 parts by weight relative to 100 parts by weight of the total monomer components (including monomer components consumed to form a portion of the polymer). In one embodiment, this content can be 0.05 to 10 parts by weight, 0.05 to 5 parts by weight, 0.05 to 3 parts by weight, 0.05 to 2 parts by weight, or 0.05 to 1.5 parts by weight. In another embodiment, this content can be 0.01 to 10 parts by weight, 0.01 to 7 parts by weight, 0.01 to 5 parts by weight, 0.02 to 5 parts by weight, or 0.03 to 5 parts by weight.

[0122] When using polyfunctional (meth)acrylate as a crosslinking agent, from the perspective of further demonstrating the effects of the present invention, the content of polyfunctional (meth)acrylate in the photocurable adhesive composition (I) is preferably 0.01 to 20 parts by weight relative to 100 parts by weight of the total monomer components (including monomer components consumed to form a partial polymer). In one embodiment, this content ratio can be 0.05 to 10 parts by weight, 0.05 to 5 parts by weight, 0.05 to 3 parts by weight, 0.05 to 1 part by weight, or 0.05 to 0.5 parts by weight. In another embodiment, this content ratio can be 0.01 to 10 parts by weight, 0.01 to 5 parts by weight, 0.01 to 1 part by weight, 0.01 to 0.5 parts by weight, or 0.01 to 0.1 parts by weight.

[0123] When at least one selected from epoxy (meth)acrylate, polyester (meth)acrylate, and urethane (meth)acrylate is used as a crosslinking agent, from the perspective of further demonstrating the effects of the present invention, the content of the crosslinking agent in the photocurable adhesive composition (I) is preferably 0.01 parts by weight to 20 parts by weight relative to 100 parts by weight of the total monomer components (including monomer components consumed to form a partial polymer), more preferably 0.1 parts by weight to 10 parts by weight, further preferably 0.2 parts by weight to 5 parts by weight, even more preferably 0.3 parts by weight to 3 parts by weight, particularly preferably 0.3 parts by weight to 2 parts by weight, and most preferably 0.4 parts by weight to 1.5 parts by weight.

[0124] When a multifunctional oligomer is used as a crosslinking agent, from the perspective of further demonstrating the effects of the present invention, the content of the multifunctional oligomer in the photocurable adhesive composition (I) is preferably 0.01 to 20 parts by weight relative to 100 parts by weight of the total monomer components (including monomer components consumed to form a partial polymer), and can be 0.1 to 15 parts by weight, 0.5 to 10 parts by weight, or 1 to 5 parts by weight.

[0125] The light-curing adhesive composition (I) may contain any other suitable additives without impairing the effects of the present invention. These other additives may be one or more. Examples of such other additives include, for instance: chain transfer agents, silane coupling agents, viscosity modifiers, adhesion promoters, plasticizers, softeners, anti-aging agents, fillers, colorants, rust inhibitors, antioxidants, antistatic agents, UV absorbers, and solvents.

[0126] In one embodiment of the photocurable adhesive composition (I), the content of the ultraviolet absorber in the photocurable adhesive composition (I) is preferably 0 to 5 parts by weight relative to 100 parts by weight of the total monomer components (including monomer components consumed to form a partial polymer), and can be 0 to 3 parts by weight, 0 to 2 parts by weight, 0 to 1 part by weight, or substantially 0 parts by weight.

[0127] The photocurable adhesive composition (I) may contain a solvent. The solvent content in the photocurable adhesive composition (I) is preferably 5% by weight or less.

[0128] The viscosity of the light-curing adhesive composition (I) is, for example, 5 poise to 150 poise.

[0129] The first adhesive layer formed from the photocurable adhesive composition (I) can be formed by any suitable method without impairing the effects of the present invention.

[0130] [1-3-a(1). An embodiment of a method for forming a first adhesive layer from a photocurable adhesive composition (I)]

[0131] As one embodiment of the method for forming a first adhesive layer from a photocurable adhesive composition (I), for example, a laminate comprising a substrate sheet, a coating layer containing the photocurable adhesive composition (I), and a release liner is formed, and the resulting laminate is irradiated with light, thereby curing the coating layer to form the first adhesive layer. Thus, a laminate comprising a substrate sheet, a first adhesive layer, and a release liner is obtained.

[0132] The laminate comprising a substrate sheet, a coating layer containing a photocurable adhesive composition (I), and a release liner can be manufactured by any suitable method without impairing the effects of the present invention. As an example, one method involves coating the release liner with the photocurable adhesive composition (I) and then laminating the substrate sheet onto the coated surface.

[0133] The substrate sheet can be a single sheet or a strip. Examples of substrate sheets include resin films. Examples of resins constituting the resin film include: polyesters such as polyethylene terephthalate, acetate resins, polyethersulfone, polycarbonate, polyamide, polyimide, polyolefin, (meth)acrylic resins, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyvinyl alcohol, polyarylate, and polyphenylene sulfide. Polyesters such as polyethylene terephthalate are preferred as the resin constituting the resin film.

[0134] The thickness of the substrate sheet can be any suitable thickness without impairing the effects of the present invention. For example, a thickness of 10 μm to 200 μm is preferred, and more preferably 25 μm to 150 μm.

[0135] The substrate sheet may have a release layer on one side of the coating layer. As the release layer, any suitable release layer can be used within the range that does not impair the effects of the present invention. For example, a commonly known release layer can be used. Such a release layer is typically a cured layer of a release agent composition containing a release agent. Various release agents can be used, such as silicone-based release agents, fluorinated release agents, long-chain alkyl-based release agents, fatty acid amide-based release agents, and silica powder. The thickness of the release layer can be any suitable thickness within the range that does not impair the effects of the present invention. For example, such a thickness is 10 nm to 300 nm.

[0136] As the substrate for the release liner (hereinafter referred to as the "liner substrate"), a resin film can be cited as an example. As the resin constituting the resin film, examples include: polyesters such as polyethylene terephthalate, acetate resins, polyethersulfone, polycarbonate, polyamide, polyimide, polyolefin, (meth)acrylic resin, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyvinyl alcohol, polyarylate, and polyphenylene sulfide. Polyesters such as polyethylene terephthalate are preferred as the resin constituting the resin film. The thickness of the release liner is, for example, 10 μm to 200 μm.

[0137] Release liner may also have layers other than the liner substrate. Release liner may have a release layer. For example, release liner may have a liner substrate and a release layer formed on one side of the liner substrate. The release layer of the release liner may be on the coating layer side.

[0138] The coating layer can be formed by any suitable method without impairing the effects of the present invention. For example, a UV-curable adhesive composition (I) is applied to the surface of a release liner (preferably the release layer side if a release layer is provided). Various coating methods can be used, such as roller coating, licking coating, gravure coating, reverse coating, brush coating, spraying, dip roller coating, bar coating, doctor blade coating, air knife coating, curtain coating, die lip coating, and die coating. Heating / drying may also be performed after coating, as needed.

[0139] The thickness of the coating layer can be adjusted according to the thickness of the final first adhesive layer.

[0140] Regarding the irradiated light, any suitable light can be irradiated under any suitable conditions within the scope of not impairing the effects of the present invention. The irradiated light can be, for example, visible light or ultraviolet light with a wavelength shorter than 450 nm. The light source for the irradiated light can be, for example, a light irradiation device equipped with an ultraviolet irradiation lamp. Examples of ultraviolet irradiation lamps include: ultraviolet LEDs, low-pressure mercury lamps, medium-pressure mercury lamps, high-pressure mercury lamps, ultra-high-pressure mercury lamps, metal halide lamps, xenon lamps, microwave-excited mercury lamps, black lights, chemical lamps, germicidal lamps, low-pressure discharge mercury lamps, and excimer lasers; combinations of two or more ultraviolet irradiation lamps are also possible. The illuminance of the irradiated light is, for example, 1 mW / cm². 2 ~20mW / cm 2 The duration of illumination is, for example, 5 minutes to 5 hours. The cumulative intensity of the illumination is, for example, 100 mJ / cm². 2 ~5000mJ / cm 2 .

[0141] [1-3-a(2). Another embodiment of a method for forming a first adhesive layer from a photocurable adhesive composition (I)]

[0142] In another embodiment of the method for forming the first adhesive layer from the photocurable adhesive composition (I), for example, after forming a laminate comprising a substrate sheet, a coating layer containing the photocurable adhesive composition (I), and a release liner in sequence, and curing the coating layer by irradiating the resulting laminate with light, the release liner is peeled off, an additive solution is applied to the surface of the exposed cured layer, and after drying as needed, the release liner is attached to the coated side of the additive solution, and the resulting laminate is irradiated with light, thereby forming the first adhesive layer. Thus, a laminate comprising a substrate sheet, the first adhesive layer, and a release liner in sequence is obtained.

[0143] It should be noted that, in this embodiment, instead of applying an additive solution to the surface of the exposed cured layer and drying it as needed, the first optical component can be first bonded to the surface of the additive solution and then irradiated with light to cure it. This process is performed by first irradiating light through the first optical component to form the first adhesive layer. Thus, a laminate comprising a substrate sheet, a first adhesive layer, and a first optical component is obtained.

[0144] As the light used for curing, any suitable light can be used within the range that does not impair the effects of the present invention.

[0145] As the aforementioned additives, any suitable additives may be used without impairing the effects of the present invention. Examples of such additives include at least one selected from photopolymerization initiators, crosslinking agents, monomer components, ultraviolet absorbers, rust inhibitors, and antistatic agents. There may be only one additive or two or more additives. It should be noted that the additives described herein do not contain solvents. As will be described later, the additives can be used in the form of a solution prepared by mixing with a solvent.

[0146] A preferred embodiment of the additive is at least one selected from photopolymerization initiators, crosslinking agents, and monomer components.

[0147] As photopolymerization initiators that can be used as the above-described additives, any suitable photopolymerization initiator can be used without impairing the effects of the present invention. The photopolymerization initiators described above can be used as such photopolymerization initiators. There can be only one photopolymerization initiator, or there can be two or more.

[0148] The amount of photopolymerization initiator that can be used as the above-mentioned additive can be any suitable amount within the range that does not impair the effects of the present invention. As such a photopolymerization initiator, it can be 0 to 10 parts by weight, or 0.1 to 5 parts by weight, relative to 100 parts by weight of the solid component of the photocurable adhesive composition (I).

[0149] In one embodiment, the amount of photopolymerization initiator that can be used as the above-mentioned additive is 100 parts by weight relative to the total amount of monomer components (including monomer components consumed to form a partial polymer) in the photocurable adhesive composition (I), for example, 0 to 10 parts by weight, or 0.01 to 10 parts by weight, or 0.05 to 5 parts by weight, or 0.1 to 3 parts by weight, or 0.3 to 1 part by weight.

[0150] As a crosslinking agent that can be used as the above-described additive, any suitable crosslinking agent can be used without impairing the effects of the present invention. The crosslinking agents described above can be used as such crosslinking agents. There can be only one crosslinking agent, or there can be two or more crosslinking agents.

[0151] The amount of crosslinking agent that can be used as the above-mentioned additive can be any suitable amount within the range that does not impair the effect of the present invention. As such a crosslinking agent, it can be 1 part to 35 parts by weight, or 5 parts to 30 parts by weight, relative to 100 parts by weight of the solid component of the photocurable adhesive composition (I).

[0152] In one embodiment, the amount of crosslinking agent that can be used as the above-mentioned additive is 100 parts by weight relative to the total amount of monomer components (including monomer components consumed to form a partial polymer) in the photocurable adhesive composition (I), for example, 0 parts by weight to 100 parts by weight, 0.1 parts by weight to 100 parts by weight, 1 part by weight to 70 parts by weight, 5 parts by weight to 50 parts by weight, 10 parts by weight to 40 parts by weight, or 15 parts by weight to 35 parts by weight.

[0153] As monomeric components that can be used as the above-described additives, any suitable monomeric component can be used without impairing the effects of the present invention. The description of the monomeric components in the photocurable adhesive composition (I) described above can be used as such monomeric components. There may be only one monomeric component, or there may be two or more monomeric components.

[0154] In one embodiment, the amount of monomer components that can be used as the above-mentioned additives is 100 parts by weight relative to the total amount of monomer components (including monomer components consumed to form a partial polymer) in the photocurable adhesive composition (I), for example, 0 parts by weight to 100 parts by weight, 0.1 parts by weight to 100 parts by weight, 0.5 parts by weight to 70 parts by weight, 1 part by weight to 50 parts by weight, 1.5 parts by weight to 40 parts by weight, 2 parts by weight to 35 parts by weight, 3 parts by weight to 30 parts by weight, 4 parts by weight to 25 parts by weight, or 5 parts by weight to 20 parts by weight.

[0155] As the aforementioned additive, an ultraviolet absorber can be used. However, from the perspective of further demonstrating the effects of the present invention, an ultraviolet absorber may not be used. As such an ultraviolet absorber, any suitable ultraviolet absorber can be used within the scope of not impairing the effects of the present invention. Examples of such ultraviolet absorbers include: triazine ultraviolet absorbers, benzotriazole ultraviolet absorbers, benzophenone ultraviolet absorbers, oxybenzophenone ultraviolet absorbers, salicylate ultraviolet absorbers, and cyanoacrylate ultraviolet absorbers.

[0156] Relative to 100 parts by weight of the total amount of monomer components (including monomer components consumed in order to form a partial polymer) in the light-curing adhesive composition (I), the ultraviolet absorber that can be used as the above-mentioned additive is preferably 0% to 5% by weight, can be 0% to 3% by weight, can be 0% to 2% by weight, can be 0% to 1% by weight, or can be substantially 0% by weight.

[0157] The total amount of the above-mentioned additives added relative to the total amount of the photocurable adhesive composition (I) (representatively the total amount of monomer components, crosslinking agents, photopolymerization initiators, and other components used as needed) is 100 parts by weight, for example, 1 part to 100 parts by weight, 3 parts to 70 parts by weight, 5 parts to 50 parts by weight, 7 parts to 40 parts by weight, or 10 parts to 30 parts by weight.

[0158] As described above, the additives can be used as solutions of the additives. The solvent used to prepare the solution of the additives can be a single solvent or two or more solvents. Examples of such solvents include: esters such as methyl acetate, ethyl acetate, isopropyl acetate, and butyl acetate; aromatic hydrocarbons such as toluene, xylene, and ethylbenzene; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclopentanone, and cyclohexanone; aliphatic hydrocarbons such as hexane, heptane, and octane; alicyclic hydrocarbons such as cyclohexane; halogenated hydrocarbons such as chloroform, dichloromethane, and 1,2-dichloroethane; and diethyl ether, dimethoxyethane, tetrahydrofuran, etc. Ethers such as alkanes; amides such as N,N-dimethylformamide and N,N-dimethylacetamide; nitriles such as acetonitrile, propionitrile, and benzonitrile; alcohols such as methanol, ethanol, propanol, isopropanol, n-butanol, isobutanol, sec-butanol, and tert-butanol.

[0159] The amount of the solvent described above can be any appropriate amount without impairing the effects of the present invention.

[0160] Details of another embodiment of the method for forming the first adhesive layer from the photocurable adhesive composition (I) as described above are described, for example, in Japanese Patent Application Publication No. 2021-155733. The entire contents of that publication are incorporated herein by reference.

[0161] <1-3-b. First adhesive layer obtained from solvent-based adhesive composition (II)>

[0162] Another embodiment of the first adhesive layer is a first adhesive layer obtained from a solvent-based adhesive composition (II). In this embodiment, the first adhesive layer is composed of a first adhesive formed from a solvent-based adhesive composition (II).

[0163] The solvent-based adhesive composition (II) typically comprises a base polymer and a crosslinking agent. In the case where the first adhesive layer is obtained from the solvent-based adhesive composition (II), the adhesive constituting the first adhesive layer may include, for example: acrylic adhesives, polyester adhesives, rubber adhesives, vinyl alkyl ether adhesives, silicone adhesives, polyamide adhesives, urethane adhesives, fluoropolymer adhesives, epoxy adhesives, and polyether adhesives.

[0164] The following description, as a representative example, illustrates the case where the adhesive constituting the first adhesive layer is an acrylic adhesive, but the adhesive constituting the first adhesive layer is not limited to this.

[0165] From the perspective of further demonstrating the effects of the present invention, the acrylic adhesive composition preferably comprises an acrylic polymer and a crosslinking agent.

[0166] In the field of acrylic adhesives, acrylic polymers are often referred to as basic polymers. There can be only one type of acrylic polymer, or there can be two or more types.

[0167] The acrylic polymer content in the acrylic adhesive composition, converted from solids, is preferably 50% to 99.9% by weight, more preferably 60% to 99.5% by weight, further preferably 70% to 99% by weight, particularly preferably 80% to 99% by weight, and most preferably 90% to 99% by weight.

[0168] As an acrylic polymer, any suitable acrylic polymer can be used without impairing the effects of the present invention.

[0169] The weight-average molecular weight (Mw) of the acrylic polymer is preferably 100,000 to 3,000,000, more preferably 150,000 to 2,000,000, even more preferably 200,000 to 1,500,000, and particularly preferably 250,000 to 1,000,000. The weight-average molecular weight (Mw) in this specification is a value determined based on GPC (gel permeation chromatography) (converted from polystyrene).

[0170] The glass transition temperature (Tg) of the acrylic polymer is preferably -100℃ to 30℃, more preferably -95℃ to 20℃, even more preferably -90℃ to 10℃, and particularly preferably -80℃ to 0℃.

[0171] Acrylic polymers are typically obtained by polymerizing monomer compositions comprising alkyl (meth)acrylates. That is, acrylic polymers typically have constituent units derived from alkyl (meth)acrylates. There may be only one type of alkyl (meth)acrylate, or there may be two or more types. The alkyl (meth)acrylate is typically an alkyl (meth)acrylate in which the alkyl group of the alkyl ester moiety has 1 to 20 carbon atoms. The alkyl group preferably has 1 to 12 carbon atoms, more preferably 1 to 10, further preferably 1 to 8, and particularly preferably 2 to 6. The alkyl group may be linear or branched.

[0172] Examples of alkyl methacrylates include: methyl methacrylate, ethyl methacrylate, propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, sec-butyl methacrylate, tert-butyl methacrylate, isobutyl methacrylate, n-pentyl methacrylate, isopentyl methacrylate, n-hexyl methacrylate, isohexyl methacrylate, isoheptyl methacrylate, 2-ethylhexyl methacrylate, n-octyl methacrylate, isooctyl methacrylate, n-nonyl methacrylate, isononyl methacrylate, n-decyl methacrylate, isodecyl methacrylate, n-dodecyl methacrylate (laurate methacrylate), n-tridecyl methacrylate, n-tetradecyl methacrylate, n-pentadecanyl methacrylate, n-hexadecyl methacrylate, hexadecyl methacrylate, heptadecanyl methacrylate, and octadecyl methacrylate.

[0173] The proportion of (meth)acrylate alkyl ester constituent units in all constituent units of the acrylic polymer is preferably 50% by weight or more, more preferably 60% to 100% by weight, further preferably 70% to 100% by weight, and particularly preferably 80% to 100% by weight. The proportion of (meth)acrylate alkyl ester in the monomer composition is preferably 50% by weight or more, more preferably 60% to 100% by weight, further preferably 70% to 100% by weight, and particularly preferably 80% to 100% by weight.

[0174] Acrylic polymers can have constituent units other than those derived from alkyl (meth)acrylates. Such constituent units are derived from other monomers capable of copolymerizing with alkyl (meth)acrylates.

[0175] Other monomers include, for example, aromatic monomers, hydroxyl monomers, carboxyl monomers, amino monomers, amide monomers, polyfunctional monomers, and other copolymerizable monomers. There may be only one type of monomer, or there may be two or more types.

[0176] Examples of aromatic ring monomers include: phenyl methacrylate, phenoxyethyl methacrylate, benzyl methacrylate, phenoxydiethylene glycol methacrylate, ethylene oxide-modified nonylphenol methacrylate, hydroxyethylated β-naphthol methacrylate, and biphenyl methacrylate.

[0177] The proportion of aromatic ring monomers in all the constituent units of the acrylic polymer is preferably 0% to 50% by weight, more preferably 1% to 30% by weight, further preferably 5% to 25% by weight, particularly preferably 8% to 20% by weight, and most preferably 10% to 18% by weight. The proportion of aromatic ring monomers in the monomer composition is preferably 0% to 50% by weight, more preferably 1% to 30% by weight, further preferably 5% to 25% by weight, particularly preferably 8% to 20% by weight, and most preferably 10% to 18% by weight.

[0178] Examples of hydroxyl-containing monomers include: 2-hydroxyethyl methacrylate, 3-hydroxypropyl methacrylate, 4-hydroxybutyl methacrylate, 6-hydroxyhexyl methacrylate, 8-hydroxyoctyl methacrylate, 10-hydroxydecyl methacrylate, and 12-hydroxylaurate methacrylate, as well as methyl methacrylate (4-hydroxymethylcyclohexyl)acrylate.

[0179] The proportion of hydroxyl-containing monomers in all the constituent units of the acrylic polymer is preferably 0% to 20% by weight, more preferably 0% to 10% by weight, further preferably 0% to 5% by weight, particularly preferably 0% to 3% by weight, and most preferably 0% to 1% by weight. The proportion of hydroxyl-containing monomers in the monomer composition is preferably 0% to 20% by weight, more preferably 0% to 10% by weight, further preferably 0% to 5% by weight, particularly preferably 0% to 3% by weight, and most preferably 0% to 1% by weight.

[0180] Examples of carboxyl-containing monomers include: (meth)acrylic acid, (meth)acrylic acid carboxyethyl ester, (meth)acrylic acid carboxypentyl ester, itaconic acid, maleic acid, fumaric acid, and crotonic acid.

[0181] Examples of amino-containing monomers include N,N-dimethylaminoethyl methacrylate and N,N-dimethylaminopropyl methacrylate.

[0182] Examples of amide-containing monomers include: (meth)acrylamide, N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-isopropylacrylamide, N-methyl(meth)acrylamide, N-butyl(meth)acrylamide, N-hexyl(meth)acrylamide, N-hydroxymethyl(meth)acrylamide, N-hydroxymethyl-N-propyl(meth)acrylamide, aminomethyl(meth)acrylamide, aminoethyl(meth)acrylamide, mercaptomethyl(meth)acrylamide, mercaptoethyl(meth)acrylamide, and other acrylamide monomers; N-(meth)acryloylmorpholine, N-(meth)acryloylpiperidine, N-(meth)acryloylpyrrolidine, and other N-acryloyl heterocyclic monomers; N-vinylpyrrolidone; N-vinyl-ε-caprolactam and other N-vinyl lactam monomers.

[0183] Examples of multifunctional monomers include: hexanediol di(meth)acrylate (1,6-hexanediol di(meth)acrylate), butanediol di(meth)acrylate, polyethylene glycol di(meth)acrylate, polypropylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, pentaerythritol di(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, trimethylolpropane tri(meth)acrylate, tetramethylolmethane tri(meth)acrylate, allyl methacrylate, vinyl methacrylate, epoxy acrylate, polyester acrylate, urethane acrylate, and other multifunctional acrylates; divinylbenzene.

[0184] The total content of the constituent units of the acrylic polymer, including those from carboxyl-containing monomers, amino-containing monomers, amide-containing monomers, and polyfunctional monomers, is preferably 0% to 20% by weight, more preferably 0% to 10% by weight, further preferably 0% to 8% by weight, particularly preferably 0% to 5% by weight, and most preferably 0% to 3% by weight. The total content of the monomer composition, including carboxyl-containing monomers, amino-containing monomers, amide-containing monomers, and polyfunctional monomers, is preferably 0% to 20% by weight, more preferably 0% to 10% by weight, further preferably 0% to 8% by weight, particularly preferably 0% to 5% by weight, and most preferably 0% to 3% by weight.

[0185] Other comonomers include, for example: alkoxyalkyl esters of methacrylates such as 2-methoxyethyl acrylate, 2-ethoxyethyl acrylate, methoxytriethylene glycol methacrylate, 3-methoxypropyl acrylate, 3-ethoxypropyl acrylate, 4-methoxybutyl acrylate, and 4-ethoxybutyl acrylate; epoxy monomers such as glycidyl acrylate and methylglycidyl acrylate; sulfonic acid monomers such as sodium vinyl sulfonate; phosphate monomers; methacrylates with alicyclic hydrocarbon groups such as cyclopentyl acrylate, cyclohexyl acrylate, and isobornyl acrylate; vinyl esters such as vinyl acetate and vinyl propionate; aromatic vinyl compounds such as styrene and vinyltoluene; olefins or dienes such as ethylene, propylene, butadiene, isoprene, and isobutylene; vinyl ethers such as vinyl alkyl ethers; and vinyl chloride.

[0186] The proportion of constituent units from other comonomers in all the constituent units of the acrylic polymer is preferably 0% to 20% by weight, more preferably 0% to 10% by weight, further preferably 0% to 5% by weight, particularly preferably 0% to 3% by weight, and most preferably 0% to 1% by weight. The proportion of other comonomers in the monomer composition is preferably 0% to 20% by weight, more preferably 0% to 10% by weight, further preferably 0% to 5% by weight, particularly preferably 0% to 3% by weight, and most preferably 0% to 1% by weight.

[0187] Acrylic polymers can be obtained by polymerizing monomer components. Examples of polymers include solution polymerization, emulsion polymerization, bulk polymerization, thermal polymerization, and active energy radiation polymerization, with solution polymerization and active energy radiation polymerization being preferred.

[0188] Solvents used in solution polymerization include, for example, esters such as ethyl acetate and n-butyl acetate; aromatic hydrocarbons such as toluene and benzene; aliphatic hydrocarbons such as n-hexane and n-heptane; alicyclic hydrocarbons such as cyclohexane and methylcyclohexane; and ketones such as methyl ethyl ketone and methyl isobutyl ketone. There may be only one solvent or two or more.

[0189] In the polymerization of monomer components, polymerization initiators can be used. The type of polymerization initiator can be appropriately selected according to the polymerization reaction; for example, it can be a thermal polymerization initiator or a photopolymerization initiator.

[0190] The polymerization initiators used in solution polymerization are, for example, azo polymerization initiators, peroxide polymerization initiators, and redox polymerization initiators. Examples of peroxide polymerization initiators include benzoyl peroxide and tert-butyl maleate peroxide. Among these, the azo polymerization initiators disclosed in Japanese Patent Application Publication No. 2002-69411 are preferred. Examples of azo polymerization initiators include 2,2'-azobisisobutyronitrile (AIBN), 2,2'-azobis(2-methylbutyronitrile), dimethyl 2,2'-azobis(2-methylpropionic acid), and 4,4'-azobis(4-cyanopentanoic acid). The amount of polymerization initiator used is preferably 0.05 parts by weight to 0.5 parts by weight, more preferably 0.1 parts by weight to 0.3 parts by weight, relative to 100 parts by weight of the total monomer components.

[0191] Examples of active energy rays used in active energy radiation polymerization include ionizing rays such as alpha rays, beta rays, gamma rays, neutron rays, and electron rays, as well as ultraviolet light, with ultraviolet light being preferred. Polymerization using ultraviolet light irradiation is also called photopolymerization. The polymerization system of active energy radiation polymerization typically includes a photopolymerization initiator.

[0192] Examples of photopolymerization initiators include: benzoin ether photopolymerization initiators, acetophenone photopolymerization initiators, α-ol ketone photopolymerization initiators, aromatic sulfonyl chloride photopolymerization initiators, photoactive oxime photopolymerization initiators, benzoin photopolymerization initiators, benzoyl photopolymerization initiators, ketal photopolymerization initiators, and thioxanone photopolymerization initiators.

[0193] Examples of benzoin ether-based photopolymerization initiators include benzoin methyl ether, benzoin ethyl ether, benzoin propyl ether, benzoin isopropyl ether, benzoin isobutyl ether, 2,2-dimethoxy-1,2-diphenylethane-1-one, and anisole methyl ether. Examples of acetophenone-based photopolymerization initiators include 2,2-diethoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 1-hydroxycyclohexylphenyl ketone, 4-phenoxydichloroacetophenone, and 4-(tert-butyl)dichloroacetophenone. Examples of α-olone-based photopolymerization initiators include 2-methyl-2-hydroxyphenylacetone and 1-[4-(2-hydroxyethyl)phenyl]-2-methylpropane-1-one. Examples of aromatic sulfonyl chloride-based photopolymerization initiators include 2-naphthalenesulfonyl chloride. Examples of photoactive oxime photopolymerization initiators include 1-phenyl-1,1-propanedione-2-(O-ethoxycarbonyl oxime). Examples of benzoin photopolymerization initiators include benzoin. Examples of benzoyl photopolymerization initiators include benzoyl. Examples of benzophenone photopolymerization initiators include benzophenone, benzoylbenzoic acid, 3,3'-dimethyl-4-methoxybenzophenone, polyvinylbenzophenone, and α-hydroxycyclohexylphenyl ketone. Examples of ketal photopolymerization initiators include benzoin dimethyl ether. Examples of thioxanthone photopolymerization initiators include thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-diisopropylthioxanthone, and dodecylthioxanthone.

[0194] The amount of photopolymerization initiator is preferably 0.01 to 1 part by weight, more preferably 0.05 to 0.5 parts by weight, relative to 100 parts by weight of the total monomer components.

[0195] In addition to polyfunctional isocyanate crosslinking agents, epoxy crosslinking agents, melamine crosslinking agents, and peroxide crosslinking agents, other crosslinking agents that can be cited include urea crosslinking agents, metal alkoxide crosslinking agents, metal chelate crosslinking agents, metal salt crosslinking agents, and carbodiimide crosslinking agents. Azoline crosslinking agents, aziridine crosslinking agents, amine crosslinking agents, etc. Among these, from the perspective of further demonstrating the effects of the present invention, at least one selected from polyfunctional isocyanate crosslinking agents and epoxy crosslinking agents is preferred.

[0196] Examples of polyfunctional isocyanate crosslinking agents include: lower aliphatic polyisocyanates such as 1,2-ethylene diisocyanate, 1,4-butylene diisocyanate, and 1,6-hexamethylene diisocyanate; alicyclic polyisocyanates such as cyclopentylene diisocyanate, cyclohexylene diisocyanate, isophorone diisocyanate, hydrogenated toluene diisocyanate, and hydrogenated xylene diisocyanate; and aromatic polyisocyanates such as 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 4,4'-diphenylmethane diisocyanate, and phenyl dimethyl diisocyanate. Examples of commercially available multifunctional isocyanate crosslinking agents include: trimethylolpropane / toluene diisocyanate adduct (manufactured by Nippon Polyurethanes Co., Ltd., trade name "CORONATE L"), trimethylolpropane / hexamethylene diisocyanate adduct (manufactured by Nippon Polyurethanes Co., Ltd., trade name "CORONATE HL"), isocyanurate derivative of hexamethylene diisocyanate (manufactured by Nippon Polyurethanes Co., Ltd., trade name "CORONATE HX"), and trimethylolpropane / phenylenedimethyl diisocyanate adduct (manufactured by Mitsui Chemicals Co., Ltd., trade name "Takenate 110N").

[0197] As an epoxy crosslinking agent (multifunctional epoxy compound), in addition to examples such as N,N,N',N'-tetraglycidyl-m-xylenediamine, diglycidyl aniline, 1,3-bis(N,N-diglycidylaminomethyl)cyclohexane, 1,6-hexanediol diglycidyl ether, neopentyl glycol diglycidyl ether, ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, sorbitol poly... In addition to glycidyl ether, glycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, polyglycerol polyglycidyl ether, sorbitan polyglycidyl ether, trimethylolpropane polyglycidyl ether, diglycidyl adipate, diglycidyl phthalate, triglycidyl tris(2-hydroxyethyl) isocyanurate, resorcinol diglycidyl ether, and bisphenol-S-diglycidyl ether, epoxy resins having two or more epoxy groups within the molecule can also be cited. As epoxy crosslinking agents, commercially available products such as "TETRAD C" (manufactured by Mitsubishi Gas Chemical Co., Ltd.) can also be cited.

[0198] The crosslinking agent content in the acrylic adhesive composition can be any suitable amount within a range that does not impair the effects of the present invention. As such a content, for example, from the perspective of further demonstrating the effects of the present invention, it is preferably 0.1 parts by weight to 30% by weight, more preferably 0.1% by weight to 10% by weight, further preferably 0.1 parts by weight to 5.0 parts by weight, even more preferably 0.2 parts by weight to 4.5 parts by weight, particularly preferably 0.3 parts by weight to 4.0 parts by weight, and most preferably 0.4 parts by weight to 3.5 parts by weight, relative to the solid content (100 parts by weight) of the acrylic polymer.

[0199] Acrylic adhesive compositions may contain any suitable other components without impairing the effects of the present invention. Examples of such other components include, for instance, polymer components other than acrylic polymers, crosslinking accelerators, crosslinking catalysts, silane coupling agents, tackifying resins (rosin derivatives, polyterpene resins, petroleum resins, oil-soluble phenols, etc.), anti-aging agents, inorganic fillers, organic fillers, metal powders, colorants (pigments, dyes, etc.), foils, ultraviolet absorbers, antioxidants, light stabilizers, chain transfer agents, plasticizers, softeners, surfactants, antistatic agents, conductive agents, stabilizers, surface lubricants, leveling agents, corrosion inhibitors, heat stabilizers, polymerization inhibitors, lubricants, solvents, catalysts, etc.

[0200] The solids concentration of the acrylic adhesive composition is, for example, 5% to 50% by weight, preferably 10% to 40% by weight.

[0201] The first adhesive layer can be formed from an acrylic adhesive composition by any suitable method without impairing the effects of the invention.

[0202] As one embodiment of the method for forming the first adhesive layer from an acrylic adhesive composition, for example, the acrylic adhesive composition is coated onto a substrate sheet to form a coating layer, and the resulting coating layer is dried to form the first adhesive layer. Thus, a laminate comprising a substrate sheet and a first adhesive layer is obtained.

[0203] As a substrate sheet, a release film can be used, for example. Examples of materials that can be used to make a release film include: porous materials such as plastic film, paper, cloth, and non-woven fabric; mesh; foam sheets; metal foil; and laminates thereof.

[0204] Examples of plastic films include: polyethylene film, polypropylene film, polybutene film, polybutadiene film, polymethylpentene film, polyvinyl chloride film, vinyl chloride copolymer film, polyethylene terephthalate film, polybutylene terephthalate film, polyurethane film, and ethylene-vinyl acetate copolymer film.

[0205] The thickness of the release film is, for example, 5 μm to 200 μm, preferably around 5 μm to 100 μm. The release film can be subjected to release treatment using various release agents, such as silicone-based release agents, fluorinated release agents, long-chain alkyl release agents, fatty acid amide release agents, and silica powder.

[0206] Methods for applying acrylic adhesive compositions to a substrate sheet include, for example, roller coating, licker coating, gravure coating, reverse coating, roller brushing, spraying, dip roller coating, bar coating, doctor blade coating, air knife coating, curtain coating, die lip coating, and extrusion coating using a die coating machine. The coating amount can be appropriately adjusted according to the purpose.

[0207] The coating layer is dried, thereby curing it to form the first adhesive layer. The drying temperature of the coating layer can be any suitable temperature within a range that does not impair the effects of the invention. Such drying temperatures are, for example, 30°C to 130°C, preferably 50°C to 125°C, more preferably 60°C to 120°C, even more preferably 70°C to 110°C, and particularly preferably 80°C to 100°C.

[0208] The drying time of the coating layer can be any suitable drying time within the range that does not impair the effects of the present invention. Such a drying time is, for example, 10 seconds to 1000 seconds, preferably 30 seconds to 300 seconds, more preferably 40 seconds to 240 seconds, and particularly preferably 60 seconds to 180 seconds.

[0209] <1-3-c. First adhesive layer>

[0210] As the first adhesive layer, any suitable adhesive layer can be used without impairing the effects of the present invention, and an adhesive layer formed from any suitable adhesive composition (typically, formed by curing) can be used. Examples of such adhesive compositions include, for instance, adhesive compositions comprising epoxy resin and amine compounds.

[0211] Examples of epoxy resins include: difunctional epoxy resins such as bisphenol A type epoxy oxides, phenolic varnish epoxy resins such as phenolic varnish epoxy resins and cresol varnish epoxy resins, polyfunctional epoxy resins, glycidylamine type epoxy resins, heterocyclic epoxy resins, and alicyclic epoxy resins.

[0212] Examples of amine compounds include: diethylenetriamine, triethylenetetramine, methylenebis(2-chloroaniline), methylenebis(2-methyl-6-methylaniline), 1,5-naphthalene diisocyanate, and n-butyl benzyl phthalate.

[0213] The amount of the amine compound relative to 100 parts by weight of epoxy resin can be any suitable amount without impairing the effects of the present invention. For example, the amount of such amine compound relative to 100 parts by weight of epoxy resin is preferably 1 to 100 parts by weight, more preferably 5 to 80 parts by weight, further preferably 10 to 60 parts by weight, and particularly preferably 15 to 50 parts by weight.

[0214] The adhesive composition may contain any other suitable ingredients without impairing the effects of the invention.

[0215] 1-4. Second Adhesive Layer

[0216] As the second adhesive layer, any suitable adhesive layer or bonding agent layer may be used without impairing the effects of the present invention. Preferably, the second adhesive layer is an adhesive layer (second adhesive layer). Regarding such a second adhesive layer, the description of the first adhesive layer in section 1-3, "First Adhesive Layer," can be cited, for example. In particular, the description of the first adhesive layer obtained from the solvent-based adhesive composition (II) in section 1-3, "First Adhesive Layer," can be preferably cited.

[0217] The thickness of the second adhesive layer is as described above, preferably 5μm to 20μm, more preferably 5μm to 17μm, further preferably 5μm to 16μm, particularly preferably 5μm to 15μm, and most preferably 5μm to 14μm.

[0218] 1-5. Third Adhesive Layer

[0219] As the third adhesive layer, any suitable adhesive layer or bonding agent layer may be used without impairing the effects of the present invention. Preferably, the third adhesive layer is an adhesive layer (third adhesive layer). Regarding such a third adhesive layer, the description of the first adhesive layer in section 1-3, "First Adhesive Layer," can be cited, for example. In particular, the description of the first adhesive layer obtained from the solvent-based adhesive composition (II) in section 1-3, "First Adhesive Layer," is preferred.

[0220] The thickness of the third adhesive layer is as described above, preferably 5μm to 20μm, more preferably 5μm to 17μm, further preferably 5μm to 16μm, particularly preferably 5μm to 15μm, and most preferably 5μm to 14μm.

[0221] 1-6. First Optical Component

[0222] As the first optical component, any suitable optical component can be used without impairing the effects of the present invention, as long as it can impart optical functions to the optical laminate of the embodiment of the present invention. Examples of such optical components include: anti-reflective laminates and sunglasses-resistant laminates.

[0223] The thickness of the first optical component is typically 40 μm to 120 μm, preferably 70 μm to 100 μm.

[0224] One embodiment of the first optical component is an anti-reflective laminate. The anti-reflective laminate typically includes a first substrate, a hard coating disposed on the visible side of the first substrate, and an anti-reflective layer disposed on the visible side of the hard coating. The hard coating may be formed directly on the visible side of the first substrate. The anti-reflective layer may be formed directly on the visible side of the hard coating. The anti-reflective laminate can be a component formed by laminating an anti-reflective layer / hard coating / first substrate. In the anti-reflective laminate, the first substrate and a first adhesive layer are laminated together.

[0225] <1-6-a. First substrate>

[0226] The first substrate is typically used to form a hard coating and an anti-reflective layer. Any suitable resin film can be used as the first substrate. Examples of materials forming the first substrate include: polyester resins such as polyethylene terephthalate (PET), cyclic olefin resins such as norbornene resins, resins obtained by addition polymerization of cyclic olefins (e.g., norbornene) with α-olefins (e.g., ethylene) (COC), and cellulose resins such as cellulose triacetate (TAC). One embodiment of the first substrate includes a cellulose resin such as TAC.

[0227] The thickness of the first substrate can be appropriately set according to the purpose. The thickness of the first substrate is typically 20 μm to 200 μm, preferably 50 μm to 150 μm, and more preferably 70 μm to 90 μm.

[0228] <1-6-b. Hard coating>

[0229] Hard coatings can, for example, impart excellent pencil hardness to optical laminates. Furthermore, by appropriately adjusting the refractive index difference between the hard coating and the antireflective layer, the reflectivity of the optical laminate can be further reduced.

[0230] The hard coating preferably possesses sufficient surface hardness, excellent mechanical strength, and excellent light transmittance. The hard coating can be formed from any suitable resin as long as it exhibits these desired properties. Specific examples of resins include thermosetting resins, thermoplastic resins, UV-curable resins, electron beam-curable resins, and two-component blended resins. Among the resins used to form the hard coating, UV-curable resins are preferred. If the resin is a UV-curable resin, the hard coating can be formed with simple operation and high efficiency.

[0231] Specific examples of UV-curable resins include UV-curable resins of polyester, acrylic, urethane, amide, silicone, and epoxy types. These UV-curable resins contain UV-curable monomers, oligomers, and polymers. Preferred UV-curable resins include resin compositions containing acrylic monomers or oligomers, preferably having two or more, more preferably three to six UV-polymerizable functional groups. Typically, a photopolymerization initiator is incorporated into the UV-curable resin.

[0232] Hard coatings can be formed by any suitable method. For example, a hard coating can be formed by applying a hard coating forming resin composition to a first substrate, drying it, and curing the dried coating film by irradiating it with ultraviolet light.

[0233] The thickness of the hard coating is, for example, 0.5 μm to 20 μm, preferably 1 μm to 15 μm.

[0234] For details regarding the hard coating and the bonding structure between the hard coating and the antireflective layer, please refer to, for example, Japanese Patent Application Publication No. 2016-224443, the contents of which are incorporated herein by reference.

[0235] <1-6-c. Anti-reflective layer>

[0236] An antireflective layer is provided to prevent reflection of external light (e.g., fluorescent lamps). Any suitable configuration can be used as the composition of the antireflective layer. Representative configurations of antireflective layers include, for example: (1) a single layer of low refractive index layer with an optical film thickness of 120 nm to 140 nm and a refractive index of about 1.35 to 1.55; (2) a laminate having a medium refractive index layer, a high refractive index layer and a low refractive index layer in sequence from the first substrate; and (3) a multilayer laminate with alternating high refractive index layer and low refractive index layer.

[0237] Examples of materials suitable for forming low-refractive-index layers include silicon oxide (SiO2) and magnesium fluoride (MgF2). The refractive index of a low-refractive-index layer is typically around 1.35 to 1.55. Examples of materials suitable for forming high-refractive-index layers include titanium oxide (TiO2), niobium oxide (Nb2O3 or Nb2O5), indium tin oxide (ITO), antimony-doped tin oxide (ATO), and ZrO2-TiO2. The refractive index of a high-refractive-index layer is typically around 1.60 to 2.20. Examples of materials suitable for forming medium-refractive-index layers include titanium oxide (TiO2) and mixtures of materials suitable for forming low-refractive-index layers and materials suitable for forming high-refractive-index layers (e.g., a mixture of titanium oxide and silicon oxide). The refractive index of a medium-refractive-index layer is typically around 1.50 to 1.85. The thicknesses of the low-refractive-index, medium-refractive-index, and high-refractive-index layers can be set to achieve an appropriate optical film thickness corresponding to the layer structure of the anti-reflective layer and the desired anti-reflective performance.

[0238] Antireflective layers can typically be formed using dry processes. Specific examples of dry processes include PVD (Physical Vapor Deposition) and CVD (Chemical Vapor Deposition). Examples of PVD methods include vacuum evaporation, reactive evaporation, ion beam assisted deposition, sputtering, and ion plating. Examples of CVD methods include plasma CVD. Sputtering is the preferred dry process for forming the antireflective layer.

[0239] The thickness of the anti-reflective layer is, for example, around 20nm to 300nm.

[0240] The difference between the maximum and minimum reflectivity of the antireflective layer in the wavelength range of 400nm to 700nm is preferably 2.0% or less, more preferably 1.9% or less, and even more preferably 1.8% or less. If the difference between the maximum and minimum reflectivity is within such a range, the coloration of reflected light can be effectively prevented.

[0241] The anti-reflective layer is typically located on the outermost surface of the visible side of the optical laminate. The moisture permeability of the anti-reflective layer is typically 1.0 g / mm². 2 The following is preferred: 0.01 g / mm 2 ~0.1g / mm 2 It should be noted that humidity permeability can be determined based on the humidity permeability test (cup method) of JIS Z0208 (e.g., JIS Z0208:1976), in an atmosphere of 40°C and 92%RH, for 24 hours in an area of ​​1m². 2The water vapor permeability (g) of the sample is measured. If the water permeability of the outermost antireflective layer is below the above-mentioned upper limit, the warping of the optical laminate in a high-humidity environment can be suppressed more stably.

[0242] The anti-reflective layer may not be located on the outermost surface of the optical laminate. The outermost layer of the anti-reflective laminate can be positioned on the visible side of the anti-reflective layer, depending on the desired configuration. That is, the anti-reflective laminate can consist of a first substrate, a hard coating layer, an anti-reflective layer, and an outermost layer. The moisture permeability range of the outermost layer is the same as that of the anti-reflective layer described above. For example, an antifouling layer can be used as the outermost layer. The antifouling layer may contain, for example, a fluorinated silane compound (e.g., an alkoxysilane compound having a perfluoropolyether group) or a fluorinated organic compound. The antifouling layer preferably exhibits water repellency with a water contact angle of 110 degrees or more.

[0243] 1-7. Second Optical Component

[0244] The second optical component can be any suitable optical component without impairing the effects of the present invention. The second optical component is typically a component capable of imparting excellent resistance to localized loads to the optical laminate of embodiments of the present invention.

[0245] In the case where the optical laminate of the embodiment of the present invention includes a second optical component, it can be typically adopted that... Figure 2 , Figure 3 The composition of.

[0246] In the embodiments of the present invention, the optical laminate is Figure 2 In the configuration shown, the second optical component 32 is attached to the visible side of the polarizing film 10 via the second adhesive layer 22. The second optical component 32 is disposed between the first adhesive layer 21 and the second adhesive layer 22. The second optical component 32 is in contact with both the first adhesive layer 21 and the second adhesive layer 22, and is pressure-sensitively bonded to both layers.

[0247] In the embodiments of the present invention, the optical laminate is Figure 3 In the configuration shown, the second optical component 32 is attached to the visible side of the third optical component 33 via the second adhesive layer 22. The second optical component 32 is disposed between the first adhesive layer 21 and the second adhesive layer 22. The second optical component 32 is in contact with both the first adhesive layer 21 and the second adhesive layer 22, and is pressure-sensitively bonded to both layers.

[0248] The second optical component is formed from any suitable film. Specific examples of materials that form the main component of the second optical component include materials that are the same as those described in section <1-2-b. Protective Layer> that form the main component of the protective layer (the aforementioned transparent resin, the aforementioned thermosetting or UV-curing resin, the aforementioned glassy polymer, and the aforementioned resin composition). In one embodiment of the invention, the second optical component comprises a (meth)acrylic resin, preferably a (meth)acrylic resin having a glutarimide structure. That is, both the protective layer and the second optical component comprise (meth)acrylic resin. By using (meth)acrylic resin as both the protective layer and the second optical component, light leakage can be stably suppressed when a load exceeding a given value is locally applied to the optical laminate.

[0249] For the second optical component, similar to the protective layer, the surface treatments described above and / or the treatments described above to improve visual recognizability may be implemented as needed.

[0250] The thickness of the second optical component is typically 20 μm to 70 μm, preferably 30 μm to 50 μm. If the thickness of the second optical component is within this range, the optical laminate can be endowed with excellent resistance to localized loads, and warping of the optical laminate in high humidity environments can be sufficiently suppressed.

[0251] 1-8. Third Optical Component

[0252] As a third optical component, any suitable optical component can be used without impairing the effects of the present invention, as long as it can impart optical functions to the optical laminate of the embodiment of the present invention. Examples of such optical components include: anti-reflection laminates and sunglasses-resistant laminates.

[0253] In the case where the optical laminate of the embodiment of the present invention includes a third optical component, typically, it can be adopted that... Figure 3 The composition of.

[0254] The thickness of the third optical component is typically 20 μm to 60 μm, preferably 30 μm to 50 μm.

[0255] One embodiment of the third optical component is an anti-mapping laminate. The anti-mapping laminate includes an anti-mapping layer and a second substrate disposed on the visible side of the anti-mapping layer. The anti-mapping layer is supported by the second substrate. The anti-mapping layer is disposed on the visible side of a protective layer and is adhered to the protective layer via a third adhesive layer 23. The anti-mapping layer is in contact with the third adhesive layer 23 and is pressure-sensitively bonded to the third adhesive layer 23. The second substrate is disposed on the opposite side of the anti-mapping layer from the third adhesive layer 23. The second substrate is in contact with a second adhesive layer 22 and is pressure-sensitively bonded to the second adhesive layer 22.

[0256] <1-8-a. Anti-reflection layer>

[0257] An anti-reflection layer is provided to prevent reflections of the user's face, the keyboard of the image display device, external light (e.g., fluorescent lamps), etc., from the image display device. In one embodiment of the present invention, the anti-reflection layer is an alignment-fixing layer of a liquid crystal compound. In this specification, "alignment-fixing layer" refers to a layer in which the liquid crystal compound is aligned in a given direction and its alignment state is fixed. It should be noted that "alignment-fixing layer" includes the concept of an alignment-cured layer obtained by curing liquid crystal monomers. The liquid crystal compound can be a rod-shaped liquid crystal compound, a dish-shaped (disc-shaped) liquid crystal compound, or a combination thereof.

[0258] In one embodiment of the present invention, the anti-reflection layer comprises a disc-shaped liquid crystal compound. More specifically, the anti-reflection layer is a layer obtained by immobilizing the disc-shaped liquid crystal compound in a state whereby it is oriented in a given direction. A disc-shaped liquid crystal compound generally refers to a liquid crystal compound having a disc-shaped molecular structure in which a cyclic core such as benzene, 1,3,5-triazine, or calixarene is arranged at the center of the molecule, and straight-chain alkyl, alkoxy, or substituted benzoyloxy groups are radially substituted as side chains. Representative examples of dish-shaped liquid crystals include the benzene derivatives, benzo[a]phenanthrene derivatives, tri-indene derivatives, and phthalocyanine derivatives described in the research reports of C. Destrade et al. and Mol. Cryst. Liq. Cryst. Vol. 71, p. 111 (1981); the cyclohexane derivatives described in the research reports of B. Kohne et al. and Angew. Chem. Vol. 96, p. 70 (1984); the azacrown ethers and phenylacetylene macrocycles described in the research reports of J. Zhang et al. and J. Am. Chem. Soc. Chem. Commun. Vol. 116, p. 2655 (1994). Other specific examples of dish-shaped liquid crystal compounds include those described in Japanese Patent Application Publication Nos. 2006-133652, 2007-108732, 2010-244038, and 2014-214177. The descriptions in the aforementioned documents and publications are incorporated herein by reference. A representative example of an anti-reflection layer containing a dish-shaped liquid crystal compound is a so-called negative A-plate having a refractive index characteristic of nx = nz > ny.

[0259] In another embodiment, the anti-reflection layer comprises a rod-shaped liquid crystal compound. More specifically, in the anti-reflection layer, the rod-shaped liquid crystal compound is oriented (uniformly oriented) in a state where it is arranged along a given direction (typically the slow axis direction). Examples of rod-shaped liquid crystal compounds include, for example, liquid crystal compounds in which the liquid crystal phase is a nematic phase (nematic liquid crystal). Liquid crystal polymers and liquid crystal monomers can be used as such liquid crystal compounds, for example. The liquid crystallization mechanism of the liquid crystal compound can be lyotropic or thermotropic. Liquid crystal polymers and liquid crystal monomers can be used individually or in combination. Any suitable liquid crystal monomer can be used as the liquid crystal monomer. For example, polymerizable mesocrystalline compounds described in Japanese Patent Application Publication No. 2002-533742 (WO00 / 37585), EP358208 (US5211877), EP66137 (US4388453), WO93 / 22397, EP0261712, DE19504224, DE4408171, and GB2280445 can be used. Specific examples of such polymerizable mesocrystalline compounds include BASF's trade name LC242, Merck's trade name E7, and Wacker-Chem's trade name LC-Sillicon-CC3767. Nematic liquid crystal monomers are preferred, for example. Specific examples of liquid crystal compounds are described in Japanese Patent Application Publication No. 2006-163343. These publications are incorporated herein by reference. An anti-reflection layer containing rod-shaped liquid crystal compounds can be a so-called positive A plate with refractive index characteristics of nx > ny = nz.

[0260] Anti-ingress layer typically functions as a λ / 2 waveplate. When the anti-ingress layer functions as a λ / 2 waveplate, its orientation angle (or slow axis direction) can be controlled to effectively prevent ingress. The in-plane phase difference Re(550) of such an anti-ingress layer is 220 nm to 320 nm, more preferably 240 nm to 300 nm, and even more preferably 250 nm to 280 nm.

[0261] The angle between the slow axis of the anti-ingress layer and the absorption axis of the polarizer is preferably 35° to 55°, more preferably 40° to 50°, and even more preferably about 45°. By configuring the anti-ingress layer, which functions as a λ / 2 waveplate, with such an axial angle, ingress can be effectively prevented.

[0262] The thickness of the anti-reflection layer is preferably 1μm to 5μm, more preferably 1μm to 3μm.

[0263] When an alignment film is used for the alignment of a liquid crystal compound, the anti-mapping laminate further comprises an alignment film between the anti-mapping layer and the second substrate. That is, the anti-mapping laminate may be composed of an anti-mapping layer, an alignment film, and a second substrate. The alignment film generally contains a polymer material as the main component. Examples of polymer materials include polyvinyl alcohol, polyimide, and their derivatives. In one embodiment of the present invention, modified or unmodified polyvinyl alcohol is preferred. As an alignment film, for example, the modified polyvinyl alcohol described in WO01 / 88574A1 and Japanese Patent No. 3907735 can be used. Typically, the alignment film is subjected to an alignment treatment. Examples of alignment treatments include rubbing treatment and photoalignment treatment. Rubbing treatment is well known in the industry, so detailed description is omitted. As an alignment film that has undergone photoalignment treatment (photoalignment film), for example, the alignment film described in WO2005 / 096041 and the trade name LPP-JP265CP manufactured by Rolic Technologies can be used. The thickness of the alignment film is, for example, 0.01 μm to 10 μm, preferably 0.01 μm to 1 μm, and more preferably 0.01 μm to 0.5 μm.

[0264] An anti-reflection layer can be formed, for example, in the following sequence: First, an alignment film forming coating solution is applied to a second substrate and dried to form a coating film. This coating film is then rubbed along a given direction to form an alignment film on the second substrate. This given direction may correspond to the slow axis direction of the resulting anti-reflection layer. Next, an anti-reflection layer forming coating solution (e.g., a solution containing a liquid crystal compound and, if necessary, a crosslinking monomer) is applied to the formed alignment film and heated. Heating removes the solvent from the coating solution and allows the liquid crystal compound to align. Heating can be performed in one stage or in multiple stages by varying the temperature. Next, the crosslinking (or polymerizing) monomer is crosslinked (or polymerized) by ultraviolet irradiation, thereby immobilizing the alignment of the liquid crystal compound. Thus, an anti-reflection layer is formed on the second substrate (essentially on the alignment film). It should be noted that methods for aligning disc-shaped liquid crystal compounds are described, for example, in Japanese Patent Application Publication No. 2014-214177, and methods for aligning rod-shaped liquid crystal compounds are described, for example, in Japanese Patent Application Publication No. 2006-163343. These publications are incorporated herein by reference. It should also be noted that, depending on the desired alignment state and the type of liquid crystal compound, the alignment film may be omitted.

[0265] <1-8-b. Second Substrate>

[0266] The second substrate can be used to form an anti-reflection layer.

[0267] As the second substrate, any suitable resin film can be used. Examples of resin film forming materials include: polyester resins such as polyethylene terephthalate (PET), cyclic olefin resins such as norbornene resins, resins obtained by addition polymerization of cyclic olefins (e.g., norbornene) with α-olefins (e.g., ethylene) (COC), and cellulose resins such as cellulose triacetate (TAC). In one embodiment of the present invention, the second substrate comprises a cellulose resin such as TAC.

[0268] The thickness of the second substrate can be appropriately set according to the purpose. The thickness of the second substrate is typically 20 μm to 200 μm, preferably 25 μm to 100 μm, and more preferably 30 μm to 50 μm.

[0269] 1-9. First Phase Difference Membrane

[0270] The first retardation film can be composed of a retardation film having any suitable optical and / or mechanical properties according to the purpose. The first retardation film is located on the opposite side of the polarizing film from the visible side. The first retardation film is typically attached to the opposite side of the polarizing film from the visible side via any suitable adhesive layer. The first retardation film also serves as a protective layer on the opposite side of the polarizer from the visible side.

[0271] The thickness of the first phase difference film is preferably 10 μm to 60 μm, more preferably 30 μm to 50 μm.

[0272] The in-plane phase difference Re(550) of the first phase difference film is preferably 80nm~150nm, more preferably 90nm~140nm, and even more preferably 100nm~130nm.

[0273] The refractive index characteristics of the first retardation film preferably exhibit a relationship of nx > ny > nz. The Nz coefficient of the first retardation film is preferably 1.1 to 3.0, more preferably 1.3 to 2.7.

[0274] The first retardation film is preferably configured such that its slow axis is substantially parallel to the absorption axis of the polarizer. In this specification, the expressions "substantially parallel" and "generally parallel" include the case where the angle between the two directions is 0°±7°, preferably 0°±5°, and more preferably 0°±3°. The expressions "substantially orthogonal" and "generally orthogonal" include the case where the angle between the two directions is 90°±7°, preferably 90°±5°, and more preferably 90°±3°. Furthermore, in this specification, the terms "orthogonal" or "parallel" can include substantially orthogonal or substantially parallel states.

[0275] The absolute value of the photoelastic coefficient of the first phase retardation film is preferably 2 × 10⁻⁶. -11 m 2Resins with a photoelastic modulus of / N or less. The absolute value of this photoelastic modulus is more preferably 2.0 × 10⁻⁶. -13 m 2 / N~1.5×10 -11 m 2 / N, further preferably 1.0×10 -12 m 2 / N~1.2×10 -11 m 2 / N. By appropriately adjusting the photoelastic coefficient of the first retardation film, an optical laminate more suitable for suppressing display defects can be obtained even when a small object impacts or presses the screen with a narrow contact area. If the absolute value of the photoelastic coefficient is within such a range, phase difference changes are less likely to occur when shrinkage stress occurs during heating. Therefore, by using a resin with such an absolute value of the photoelastic coefficient to form the first retardation film, thermal unevenness can be well prevented when the optical laminate is applied to an image display device.

[0276] The first retardation film can exhibit inverse wavelength dispersion characteristics where the phase difference increases with the wavelength of the measurement light, positive wavelength dispersion characteristics where the phase difference decreases with the wavelength of the measurement light, or flat wavelength dispersion characteristics where the phase difference hardly changes with the wavelength of the measurement light. Preferably, the first retardation film exhibits flat wavelength dispersion characteristics. Specifically, the Re(450) / Re(550) ratio of the first retardation film 7 is preferably 0.99 to 1.03, and the Re(650) / Re(550) ratio is preferably 0.98 to 1.02. By arranging a λ / 2 waveplate (first retardation film) and a λ / 4 waveplate (second retardation film) with flat wavelength dispersion characteristics at a given axial angle, characteristics approaching ideal inverse wavelength dispersion characteristics can be obtained, resulting in excellent anti-reflection properties.

[0277] The first retardation film can be composed of any suitable resin film capable of satisfying the characteristics described above. Representative examples of such resins include: cyclic olefin resins, polycarbonate resins, cellulose resins, polyester resins, polyvinyl alcohol resins, polyamide resins, polyimide resins, polyether resins, polystyrene resins, and acrylic resins. Among these, cyclic olefin resins are particularly suitable. The first retardation film 7 can be obtained, for example, by stretching a film formed from the above-mentioned resins. Detailed information regarding cyclic olefin resins and stretching methods for resin films (methods for forming retardation films) is described, for example, in Japanese Patent Application Publication Nos. 2015-210459 and 2016-105166. The descriptions in these publications are incorporated herein by reference.

[0278] 1-10. Second Phase Difference Film

[0279] The second retardation film may be composed of a retardation film having any suitable optical and / or mechanical properties as required for the purpose. The second retardation film is located on the opposite side of the visible side of the first retardation film. The second retardation film is typically bonded to the opposite side of the visible side of the first retardation film via any suitable adhesive layer.

[0280] The thickness of the second phase difference film is preferably 10 μm to 50 μm, more preferably 20 μm to 40 μm.

[0281] The in-plane phase difference Re(550) of the second phase difference film is preferably 10nm~60nm, more preferably 20nm~50nm, and even more preferably 30nm~40nm.

[0282] The refractive index characteristics of the second phase retardation film preferably exhibit a relationship of nz > nx > ny. The Nz coefficient of the second phase retardation film is preferably -10 to -0.1, more preferably -5 to -1.

[0283] The second phase difference film can preferably be configured such that its slow axis is substantially orthogonal to the absorption axis of the polarizer.

[0284] The second phase refraction film can be composed of any suitable resin film capable of satisfying the characteristics described above. Such a resin is typically a polymer with negative birefringence. A polymer with negative birefringence is one whose refractive index decreases relatively in the orientation direction when the polymer is oriented by stretching or the like. Examples of polymers with negative birefringence include polymers with highly polarized anisotropic chemical bonds or functional groups such as aromatics and carbonyl groups introduced into the side chains. Specific examples include modified polyolefin resins (e.g., modified polyethylene resins), acrylic resins, styrene resins, maleimide resins, and fumarate resins. The second phase refraction film can be obtained, for example, by appropriately stretching a film formed from the aforementioned resin.

[0285] In one embodiment of the present invention, the optical laminate includes a first phase retardation film and a second phase retardation film, but the optical laminate may also not include the first phase retardation film and / or the second phase retardation film.

[0286] 1-11. Adhesive layer on panel side

[0287] The panel-side adhesive layer is located on the side of the second retardation film opposite to the visible side. The panel-side adhesive layer can typically be formed by applying any suitable adhesive to the second retardation film. The thickness of the panel-side adhesive layer is preferably 1 μm to 60 μm, more preferably 5 μm to 30 μm. In one embodiment of the invention, the optical laminate includes the panel-side adhesive layer, but the optical laminate may also lack the panel-side adhesive layer.

[0288] As the panel-side adhesive layer, any suitable adhesive layer can be used without impairing the effects of the present invention. Representatively, an adhesive layer composed of any suitable adhesive capable of bonding the retardation film to other components can be used. For example, the description of the first adhesive layer in section 1-3, "First Adhesive Layer," can be used as such an adhesive layer. In particular, the description of the first adhesive layer obtained from the solvent-based adhesive composition (II) in section 1-3, "First Adhesive Layer," is preferred.

[0289] 2. Image Display Devices

[0290] The optical laminate of embodiments of the present invention can be applied to image display devices. Therefore, one embodiment of the present invention also includes an image display device using such an optical laminate. Representative examples of image display devices include liquid crystal display devices and organic EL display devices. The image display device of an embodiment of the present invention typically has the optical laminate of an embodiment of the present invention on its viewable side. The image display device includes an image display panel. The image display panel includes image display units. It should be noted that sometimes an image display device is referred to as an optical display device, sometimes an image display panel is referred to as an optical display panel, and sometimes an image display unit is referred to as an optical display unit.

[0291] Example

[0292] The present invention will now be specifically described through embodiments, but the present invention is not limited to these embodiments in any way. It should be noted that the testing and evaluation methods in the embodiments are as follows. It should be noted that when a term is used as "parts," unless otherwise specified, it refers to "parts by weight," and when a term is used as "%," unless otherwise specified, it refers to "% by weight."

[0293] <Calculation of residual stress attenuation rate ΔF (%) and maximum strain rate ΔL (%)>

[0294] (Puncture test)

[0295] The optical laminates obtained in the examples and comparative examples were cut into 5cm × 5cm pieces as test samples. Next, the obtained test samples were bonded to a 1.2mm thick glass plate using a panel-side adhesive layer. The test samples bonded to the glass plate were placed on a stage equipped with a puncture device (Instron, product name "5581"). The radius of curvature R of the tip of the puncture device was 550μm. At room temperature (23℃ ± 3℃), the puncture device was punctured into the test sample on the stage at a puncture speed of 0.9mm / min, and the procedure was performed as described above. Figure 4 As shown, the load that is held for 15 seconds after reaching the maximum load Fp (kgf) is defined as F (kgf), and the displacement when the maximum load Fp (kgf) is reached is defined as L (μm).

[0296] (calculate)

[0297] Using the maximum load Fp (kgf) obtained in the above puncture test, the load F (kgf) held for 15 seconds after reaching the maximum load Fp (kgf), the displacement L (μm) when reaching the maximum load Fp (kgf), and the total thickness T (μm) of the optical laminate of the test object, the residual stress attenuation rate ΔF (%) was calculated by the following formula (1), and the maximum strain rate ΔL (%) was calculated by the following formula (2).

[0298] Formula (1): ΔF=[(Fp-F) / Fp]×100

[0299] Equation (2): ΔL=(L / T)×100

[0300] <Light Leakage Evaluation>

[0301] The optical laminates obtained in the examples and comparative examples were cut into 5cm × 5cm dimensions as test samples. Next, the obtained test samples were bonded to a 1.2mm thick glass plate using a panel-side adhesive layer. The test samples bonded to the glass plate were placed on the stage of an Indenter CMS testing machine (Instron, product name: 5581) equipped with a puncture tool. The radius of curvature R of the tip of the puncture tool was 550μm. The test sample on the stage was punctured through the puncture tool under a load of 8.5kg at room temperature (23℃ ± 3℃). The polarizer of the optical laminate after the puncture test was configured in an orthogonal nico configuration with the polarizer attached to the microscope. Light leakage was observed using a microscope (objective magnification: 5x). Evaluation was performed according to the following criteria.

[0302] A: No light leakage was confirmed, or a small amount of light leakage was confirmed but there were no problems in actual use.

[0303] B: The extent of light leakage that will have an impact in actual use has been confirmed.

[0304] C: Light leakage was confirmed to be at a level that is unacceptable in actual use.

[0305] <Stripping Evaluation>

[0306] The optical laminates obtained in the examples and comparative examples were cut into 5cm × 5cm dimensions to serve as test samples. Next, the obtained test samples were bonded to a 1.2mm thick glass plate using a panel-side adhesive layer. The test samples bonded to the glass plate were placed on a stage of an Indenter CMS testing machine (manufactured by Instron, product name "5581") equipped with a puncture tool. The radius of curvature R of the tip of the puncture tool was 550μm. At room temperature (23℃ ± 3℃), the test samples on the stage were punctured through the puncture tool under a load of 8.5kg (puncture test). Peeling of the punctured samples was confirmed by visual inspection.

[0307] The evaluation was conducted according to the following criteria.

[0308] ○: No peeling occurred.

[0309] △: No peeling occurred immediately after the puncture test, but peeling was observed one week later.

[0310] ×: Peeling occurred immediately after the puncture test.

[0311] <Paste Thickness Precision Evaluation>

[0312] The optical laminates obtained in the examples and comparative examples were cut into 150mm × 150mm sizes and used as test samples. The thickness at 10 locations was measured using a digital display meter (manufactured by Ozaki Manufacturing Co., Ltd., product name "Digital Upright Gauge R1N-225"). The average thickness was calculated, and the deviation was evaluated.

[0313] The evaluation was conducted according to the following criteria.

[0314] ○: The deviation is within 10% of the paste thickness.

[0315] ×: Deviation greater than 10% of paste thickness.

[0316] <Photoelastic coefficient>

[0317] The test object was cut into 20mm × 100mm dimensions to prepare a sample. The photoelastic coefficient was measured by using an ellipsometry (M-150, manufactured by Japan Spectrophotometer Co., Ltd.) with light at a wavelength of 550nm.

[0318] [Manufacturing Example 1]: Manufacturing of Polarizing Film

[0319] As a thermoplastic resin substrate, a strip-shaped amorphous polyethylene terephthalate copolymer film (thickness: 100 μm) with a Tg of approximately 75 °C was used to perform corona treatment on one side of the resin substrate.

[0320] A PVA aqueous solution (coating solution) was prepared by adding 13 parts by weight of potassium iodide to 100 parts by weight of a PVA resin made by mixing polyvinyl alcohol (degree of polymerization 4200, degree of saponification 99.2 mol%) and acetyl-modified PVA (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER") in a ratio of 9:1, and dissolving the resulting mixture in water.

[0321] The above-mentioned PVA aqueous solution was coated on the corona-treated surface of the resin substrate and dried at 60°C, thereby forming a PVA resin layer with a thickness of 13 μm and producing a laminate.

[0322] The resulting laminate was unidirectionally stretched to 2.4 times its original length in an oven at 130°C (assisted stretching treatment in a gas atmosphere).

[0323] Next, the laminate is immersed in an insoluble bath at 40°C (an aqueous solution of boric acid prepared by mixing 4 parts by weight of boric acid with 100 parts by weight of water) for 30 seconds (insoluble treatment).

[0324] Next, the polarizer was immersed in a staining bath (an iodine aqueous solution prepared by mixing iodine and potassium iodide in a weight ratio of 1:7 relative to 100 parts by weight of water) at a liquid temperature of 30°C for 60 seconds while adjusting the concentration to achieve the desired monomer transmittance (Ts) of the final polarizer.

[0325] Next, immerse in a crosslinking bath at 40°C (an aqueous solution of boric acid prepared by mixing 3 parts by weight of potassium iodide and 5 parts by weight of boric acid with 100 parts by weight of water) for 30 seconds (crosslinking treatment).

[0326] Then, the laminate was immersed in a boric acid aqueous solution (boric acid concentration 4 wt%, potassium iodide concentration 5 wt%) at a liquid temperature of 70°C, and simultaneously subjected to unidirectional stretching (stretching treatment in aqueous solution) in the longitudinal direction (length direction) between rollers with different circumferential speeds to achieve a total stretch ratio of 5.5.

[0327] Then, the laminate was immersed in a cleaning bath at 20°C (an aqueous solution of 100 parts by weight of water and 4 parts by weight of potassium iodide) (cleaning treatment).

[0328] Then, while drying in an oven maintained at approximately 90°C, it comes into contact with SUS heated rollers maintained at a surface temperature of approximately 75°C (drying shrinkage treatment).

[0329] In this way, a polarizer with a thickness of about 5 μm is formed on the resin substrate.

[0330] An acrylic resin film (manufactured by KANEKA Co., Ltd., product name "HTX") with a glutarimide structure (thickness = 40 μm) was bonded as a protective layer to the surface of the obtained polarizer (the side opposite to the resin substrate) using a UV-curable adhesive. Specifically, the adhesive was applied to achieve a total thickness of approximately 2.0 μm and then bonded using a roller mill. UV light was then irradiated from the acrylic resin film side to cure the adhesive. Next, the resin substrate was peeled off, resulting in a polarizing film with a thickness of 45 μm, consisting of an acrylic resin film (protective layer) and a polarizer.

[0331] [Manufacturing Example 2]: Preparation of the first phase retardation film

[0332] A cyclic olefin film (manufactured by Zeon Corporation, Japan, product name "ZeonorFilm ZT12-50135") was used as the first retardation film. The thickness of the first retardation film is 18 μm. The photoelasticity coefficient of the first retardation film is 1 × 10⁻⁶. -12 m 2 / N.

[0333] [Manufacturing Example 3]: Manufacturing of the Second Phase Retardation Film

[0334] In a high-pressure reactor equipped with a stirrer, condenser, nitrogen inlet pipe, and thermometer, 48 parts by weight of hydroxypropyl methylcellulose (manufactured by Shin-Etsu Chemical Co., Ltd., trade name Metalose 60SH-50), 15601 parts by weight of distilled water, 8161 parts by weight of diisopropyl fumarate, 240 parts by weight of 3-ethyl-3-oxetanebutyl methyl acrylate, and 45 parts by weight of tert-butyl peroxypentanoate as a polymerization initiator were added. After nitrogen bubbling for 1 hour, the mixture was stirred and maintained at 49°C for 24 hours to carry out free radical suspension polymerization. Next, the mixture was cooled to room temperature, and the suspension containing the generated polymer particles was centrifuged. The obtained polymer was washed twice with distilled water and twice with methanol, and then dried under reduced pressure to obtain a white fumarate resin.

[0335] The obtained fumarate resin was dissolved in methyl ethyl ketone to prepare a solution with a solid content of 20% by weight. Further, 5 parts by weight of tributyl trimellitate as a plasticizer were added to 100 parts by weight of the fumarate resin to prepare a paste.

[0336] A polyester film (biaxially oriented poly(ethylene terephthalate) / ethylene isophthalate copolymer) with a thickness of 75 μm was used as the support film. The above-mentioned adhesive paste was applied in such a way that the dried film thickness reached about 6 μm and then dried to obtain a laminate A in which a coating film of fumarate resin was tightly laminated on the support.

[0337] The obtained laminate A was subjected to uniaxial stretching at its free end, resulting in laminate B, on which a second retardation film (positive B-plate) with refractive index anisotropy of nz > nx > ny was tightly laminated on a support. The support was then peeled off from laminate B, yielding a second retardation film (positive B-plate) with refractive index anisotropy and a thickness of 6 μm. The photoelastic coefficient of the second retardation film is 5 × 10⁻⁶. -11 m 2 / N.

[0338] [Manufacturing Example 4] Preparation of the first optical component (1a)

[0339] As the first optical component (1a), an anti-reflective laminate was used. As the anti-reflective laminate, an AR film manufactured by Dexerials Co., Ltd. was used (AR+HC thickness: 4μm, substrate thickness: 80μm, total thickness: 85μm).

[0340] [Manufacturing Example 5] Preparation of the first optical component (1b)

[0341] As the first optical component (1b), a polyester film with a thickness of 25 μm (manufactured by Toray Industries, Inc., product name "Lumirror #25-S10") was used.

[0342] [Manufacturing Example 6] Preparation of the first optical component (1c)

[0343] As the first optical component (1c), a polyester film with a thickness of 75 μm (manufactured by Toray Industries, Inc., product name "Lumirror #75-S10") was used.

[0344] [Manufacturing Example 7] Preparation of the first optical component (1d)

[0345] As the first optical component (1d), a polyester film with a thickness of 125 μm (manufactured by Toray Industries, Inc., product name "Lumirror #125-S10") was used.

[0346] [Manufacturing Example 8] Preparation of the second optical component (2)

[0347] As the second optical component (2), an acrylic resin film with a glutarimide structure (manufactured by KANEKA Corporation, product name "HTX") (thickness = 40 μm) was used.

[0348] [Manufacturing Example 9] Preparation of the third optical component (3)

[0349] As the third optical component (3), an anti-mapping laminate was used. As the anti-mapping laminate, a TAC film with a phase retardation film (product name "HL214", thickness = 42μm) manufactured by Fujifilm Corporation was used.

[0350] [Manufacturing Example 10] Manufacturing of Adhesive Composition

[0351] An adhesive composition was prepared by mixing 100 parts by weight of epoxy resin (manufactured by Mitsubishi Chemical Corporation, bisphenol A type epoxide, trade name "JER828") and 38 parts by weight of triethylenetetramine (TETA).

[0352] [Manufacturing Example 11] Manufacturing of Adhesive Composition (1)

[0353] 100 parts by weight of n-butyl acrylate (BA), 5 parts by weight of acrylic acid (AA), and 0.2 parts by weight of 2-hydroxy-1-(4-(4-(2-hydroxy-2-methylpropanoyl)benzyl)phenyl)-2-methylpropane-1-one (Omnirad 127D, manufactured by IGMresins BV) as a photopolymerization initiator were added to a four-necked flask and irradiated with ultraviolet light in a nitrogen atmosphere to obtain a monomer slurry (1) after partial photopolymerization. The ultraviolet irradiation continued until the viscosity of the liquid in the flask reached approximately 20 Pa·s. The viscosity was measured using a BH viscometer No. 5 rotor at 10 rpm and a measurement temperature of 30 °C.

[0354] 0.10 parts by weight of 1,9-nonanediol diacrylate (NDDA) as a crosslinking agent were mixed into the obtained monomer slurry (1) to obtain the adhesive composition (1).

[0355] [Manufacturing Example 12] Manufacturing of Adhesive Composition (2)

[0356] As a crosslinking agent, 0.90 parts by weight of urethane acrylate (manufactured by Daicel-Allnex Co., Ltd., trade name "EBECRYL4859") was used instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA). Otherwise, the same procedure as in manufacturing example 11 was followed to obtain the adhesive composition (2).

[0357] [Manufacturing Example 13] Manufacturing of Adhesive Composition (3)

[0358] As a crosslinking agent, 0.70 parts by weight of urethane acrylate (manufactured by Daicel-Allnex Co., Ltd., trade name "EBECRYL4859") was used instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA). Otherwise, the same procedure as in manufacturing example 11 was followed to obtain the adhesive composition (3).

[0359] [Manufacturing Example 14] Manufacturing of Adhesive Composition (4)

[0360] As a crosslinking agent, 1.00 parts by weight of urethane acrylate (manufactured by Daicel-Allnex Co., Ltd., trade name "EBECRYL4859") was used instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA). Otherwise, the same procedure as in manufacturing example 11 was followed to obtain the adhesive composition (4).

[0361] [Manufacturing Example 15] Manufacturing of Adhesive Composition (5)

[0362] As a crosslinking agent, 5.00 parts by weight of urethane acrylate (manufactured by Daicel-Allnex Co., Ltd., trade name "EBECRYL4859") was used instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA). Otherwise, the same procedure as in manufacturing example 11 was followed to obtain the adhesive composition (5).

[0363] [Manufacturing Example 16] Manufacturing of Adhesive Composition (6)

[0364] As a crosslinking agent, 0.50 parts by weight of urethane acrylate (manufactured by Daicel-Allnex Co., Ltd., trade name "EBECRYL4859") was used instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA). Otherwise, the same procedure as in manufacturing example 11 was followed to obtain the adhesive composition (6).

[0365] [Manufacturing Example 17] Manufacturing of Adhesive Composition (7)

[0366] As a crosslinking agent, 0.50 parts by weight of epoxy acrylate (manufactured by Daicel-Allnex Co., Ltd., trade name "EBECRYL3700") was used instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA). Otherwise, the same procedure as in manufacturing example 11 was followed to obtain the adhesive composition (7).

[0367] [Manufacturing Example 18] Manufacturing of Adhesive Composition (8)

[0368] As a crosslinking agent, 1.00 parts by weight of epoxy acrylate (manufactured by Daicel-Allnex Co., Ltd., trade name "EBECRYL3700") was used instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA). Otherwise, the same procedure as in manufacturing example 11 was followed to obtain the adhesive composition (8).

[0369] [Manufacturing Example 19] Manufacturing of Adhesive Composition (9)

[0370] As a crosslinking agent, 2.00 parts by weight of epoxy acrylate (manufactured by Daicel-Allnex Co., Ltd., trade name "EBECRYL3700") was used instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA). Otherwise, the same procedure as in manufacturing example 11 was followed to obtain the adhesive composition (9).

[0371] [Manufacturing Example 20] Manufacturing of Adhesive Composition (10)

[0372] As a crosslinking agent, 1.00 parts by weight of polyester acrylate (manufactured by IGM Resins BV, trade name "PHOTOMER5429") was used instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA). Otherwise, the same procedure as in manufacturing example 11 was followed to obtain an adhesive composition (10).

[0373] [Manufacturing Example 21] Manufacturing of Adhesive Composition (11)

[0374] As a crosslinking agent, 0.50 parts by weight of polyester acrylate (manufactured by IGM Resins BV, trade name "PHOTOMER5429") was used instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA). Otherwise, the same procedure as in manufacturing example 11 was followed to obtain the adhesive composition (11).

[0375] [Manufacturing Example 22] Manufacturing of Adhesive Composition (12)

[0376] As a crosslinking agent, 2.00 parts by weight of polyester acrylate (manufactured by IGM Resins BV, trade name "PHOTOMER5429") was used instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA). Otherwise, the same procedure as in manufacturing example 11 was followed to obtain the adhesive composition (12).

[0377] [Manufacturing Example 23] Manufacturing of Adhesive Composition (13)

[0378] As a crosslinking agent, 0.50 parts by weight of bis(trimethylolpropane)tetraacrylate (manufactured by IGM Resins BV, trade name "PHOTOMER4306") was used instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA). Otherwise, the same procedure as in manufacturing example 11 was followed to obtain the adhesive composition (13).

[0379] [Manufacturing Example 24] Manufacturing of Adhesive Composition (14)

[0380] As a crosslinking agent, 2.00 parts by weight of bis(trimethylolpropane)tetraacrylate (manufactured by IGM Resins BV, trade name "PHOTOMER4306") was used instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA). Otherwise, the same procedure as in manufacturing example 11 was followed to obtain the adhesive composition (14).

[0381] [Manufacturing Example 25] Manufacturing of Adhesive Composition (15)

[0382] In the monomer slurry (1) obtained in Manufacturing Example 11, 0.10 parts by weight of 1,9-nonanediol diacrylate (NDDA) as a crosslinking agent and 30 parts by weight of N-acryloylmorpholine (ACMO) (KJ Chemicals Co., Ltd.) as an amide-containing monomer were mixed to obtain an adhesive composition (15).

[0383] [Manufacturing Example 26] Manufacturing of Adhesive Composition (16)

[0384] As a crosslinking agent, 5.00 parts by weight of 1,9-nonanediol diacrylate (NDDA) was used instead of 0.10 parts by weight of 1,9-nonanediol diacrylate (NDDA). Otherwise, the same procedure as in Manufacturing Example 25 was followed to obtain the adhesive composition (16).

[0385] [Manufacturing Example 27] Manufacturing of Adhesive Composition (17)

[0386] As a crosslinking agent, 0.05 parts by weight of 1,9-nonanediol diacrylate (NDDA) was used instead of 0.10 parts by weight of 1,9-nonanediol diacrylate (NDDA). Otherwise, the same procedure as in Manufacturing Example 11 was followed to obtain the adhesive composition (17).

[0387] [Manufacturing Example 28] Manufacturing of Adhesive Composition (18)

[0388] In the monomer slurry (1) obtained in Manufacturing Example 11, 0.05 parts by weight of 1,9-nonanediol diacrylate (NDDA) as a crosslinking agent and 15 parts by weight of N-acryloylmorpholine (ACMO) (KJ Chemicals Co., Ltd.) as an amide-containing monomer were mixed to obtain an adhesive composition (18).

[0389] [Manufacturing Example 29] Manufacturing of Adhesive Composition (19)

[0390] As a crosslinking agent, 0.05 parts by weight of 1,9-nonanediol diacrylate (NDDA) was used instead of 0.10 parts by weight of 1,9-nonanediol diacrylate (NDDA). Otherwise, the same procedure as in Manufacturing Example 25 was followed to obtain the adhesive composition (19).

[0391] [Manufacturing Example 30] Manufacturing of Additive Solution (1)

[0392] An additive solution (1) was prepared by mixing 100 parts by weight of 1,9-nonanediol diacrylate (NDDA) as a crosslinking agent, 3.0 parts by weight of bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide (trade name "Omnirad 819", manufactured by IGM Resins BV) as a photopolymerization initiator, and 103 parts by weight of ethyl acetate as a solvent.

[0393] [Manufacturing Example 31] Manufacturing of the adhesive (A) constituting the second adhesive layer and the third adhesive layer

[0394] 94.9 parts by weight of butyl acrylate (BA), 0.1 parts by weight of 4-hydroxybutyl acrylate (4HBA), and 5.0 parts by weight of acrylic acid (AA) were added to a four-necked flask equipped with a stirring blade, thermometer, nitrogen inlet tube, and condenser. Further, 0.1 parts by weight of 2,2'-azobisisobutyronitrile (2,2'-Azobisisobutyronitrile), acting as a polymerization initiator, were added along with 100 parts by weight of ethyl acetate to 100 parts by weight of this monomer mixture. After nitrogen purging by slowly stirring and introducing nitrogen, the liquid temperature in the flask was maintained at approximately 55°C, and the polymerization reaction was carried out for 8 hours to prepare a solution of an acrylic polymer with a weight-average molecular weight (Mw) of 2.2 million and an Mw / Mn ratio of 3.0. Compared to 100 parts by weight of the solid component of the obtained acrylic polymer solution, 3 parts by weight of trimethylolpropane / toluene diisocyanate adduct (manufactured by Tosoh Corporation, trade name "CORONATE L"), 0.2 parts by weight of peroxide crosslinking agent (benzoyl peroxide), and 0.075 parts by weight of epoxy-containing silane coupling agent (manufactured by Shin-Etsu Chemical Industry Co., Ltd., trade name "KBM-403") were added to obtain an adhesive (A) constituting the second adhesive layer and the third adhesive layer.

[0395] [Manufacturing Example 32] Manufacturing of peelable liner A

[0396] A silicone-based release agent composition was prepared by mixing 30 parts by weight of an addition-reaction curable silicone (containing LTC761 with hexenyl polysiloxane, 30% toluene solution, manufactured by Toray Dow Corning), 0.9 parts by weight of a release control agent (containing unreactive silicone resin, BY24-850, manufactured by Toray Dow Corning), 2 parts by weight of a curing catalyst (containing platinum catalyst, SRX212, manufactured by Toray Dow Corning), and a toluene / hexane mixed solvent (volume ratio 1:1) as a diluent. The concentration of the silicone solid component in the silicone-based release agent composition was 1.0% by weight. Next, the silicone-based release agent composition was coated onto one side of a substrate (Lumirror XD500P polyester film, 75 μm thick) using a wire rod, and heated at 130°C for 1 minute to produce a release liner A with a release layer (60 nm thick) on one side.

[0397] [Manufacturing Example 33] Manufacturing of peeling liner B

[0398] The thickness of the silicone-based release agent composition coated on the substrate was changed. In addition, a release liner B with a release layer (120 nm thick) on one side was produced by the same method as the release liner A.

[0399] [Example 1]

[0400] A laminate was fabricated by sequentially stacking the polarizing film (acrylic resin film (protective layer) / polarizer) obtained in Manufacturing Example 1, the first retardation film obtained in Manufacturing Example 2, and the second retardation film obtained in Manufacturing Example 3. The first retardation film was bonded to the polarizer side of the polarizing film. Specifically, a UV-curable adhesive was used for bonding, and the laminations were performed such that the slow axis of the first retardation film was at an angle of 0° relative to the absorption axis of the polarizer, and the slow axis of the second retardation film was at an angle of 90° relative to the absorption axis of the polarizer.

[0401] Through the above operations, a stack P1 consisting of "polarizing film (thickness 45μm) / first phase retardation film (thickness 18μm) / second phase retardation film (thickness 6μm)" was obtained.

[0402] The third optical component (3) (anti-mapping laminate) obtained in Manufacturing Example 9 is bonded to the protective layer of the obtained laminate P1 using the adhesive (A) obtained in Manufacturing Example 31. Specifically, adhesive (A) is applied to the visible side surface of the protective layer to form a third adhesive layer with a thickness of 12 μm. Next, the anti-mapping layer (alignment fixing layer of liquid crystal compound) of the third optical component (3) is brought into contact with the third adhesive layer, thereby bonding the third optical component (3) to the polarizing film via the third adhesive layer. At this time, the slow axis of the anti-mapping layer is adjusted to an angle of 45° relative to the absorption axis of the polarizer.

[0403] Next, the second optical component (2) (an acrylic resin film with a glutarimide structure serving as a reinforcing layer) is bonded to the second substrate of the third optical component (3) using the adhesive (A) obtained in Manufacturing Example 31. Specifically, adhesive (A) is applied to the visible side surface of the second substrate to form a second adhesive layer with a thickness of 12 μm, thereby bringing the second optical component (2) into contact with the second adhesive layer.

[0404] Through the above operations, a laminate Q1 was obtained consisting of "second optical component (2) (thickness 40μm) / second adhesive layer (thickness 12μm) / third optical component (3) (thickness 42μm) / third adhesive layer (thickness 12μm) / polarizing film (thickness 45μm) / first phase difference film (thickness 18μm) / second phase difference film (thickness 6μm)".

[0405] The adhesive composition (1) obtained in Manufacturing Example 11 was applied to the surface of the release layer of the release liner A obtained in Manufacturing Example 32 using an applicator, forming a coating layer. Next, the release liner B obtained in Manufacturing Example 33 was placed on the formed coating layer to obtain a laminate A1. The release liner B was configured such that the release layer and the coating layer were in contact. Next, at an illuminance of 9 mW / cm²... 2 Conditions (cumulative light intensity 2700 mJ / cm) 2 Light was irradiated from one side of the release liner A of the laminate A1. This caused the coating layer to photocur, forming a laminate B1 consisting of release liner A, first adhesive layer (1) (12 μm thick), and release liner B. An LED was used as the light source. The peak wavelength of the irradiated light in the LED was 340 nm.

[0406] Next, the release liner B is peeled off from the laminate B1, and the first optical component (1a) obtained in manufacturing example 4 is disposed on the exposed surface of the first adhesive layer (1).

[0407] Through the above operations, a laminate R1 consisting of "peeling liner A / first adhesive layer (1) (thickness 12 μm) / first optical component (1a) (thickness 85 μm)" was obtained.

[0408] Peel the release liner A from the laminate R1 and transfer the exposed first adhesive layer (1) onto the second optical component (2) of the laminate Q1.

[0409] Through the above operations, a laminate composed of the following layers was obtained: "First optical component (1a) (thickness 85μm) / First adhesive layer (1) (thickness 12μm) / Second optical component (2) (thickness 40μm) / Second adhesive layer (thickness 12μm) / Third optical component (3) (thickness 42μm) / Third adhesive layer (thickness 12μm) / Polarizing film (thickness 45μm) / First retardation film (thickness 18μm) / Second retardation film (thickness 6μm)".

[0410] Next, the adhesive (A) obtained in Manufacturing Example 31 is applied to the side of the second phase difference film opposite to the first phase difference film to form a panel-side adhesive layer (thickness 15 μm).

[0411] Through the above operations, an optical laminate (1) was obtained, consisting of the following layers: "first optical component (1a) (thickness 85μm) / first adhesive layer (1) (thickness 12μm) / second optical component (2) (thickness 40μm) / second adhesive layer (thickness 12μm) / third optical component (3) (thickness 42μm) / third adhesive layer (thickness 12μm) / polarizing film (thickness 45μm) / first retardation film (thickness 18μm) / second retardation film (thickness 6μm) / panel side adhesive layer (thickness 15μm)".

[0412] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0413] [Example 2]

[0414] The adhesive composition obtained in Manufacturing Example 10 was applied to the protective layer of the laminate P1 obtained in Example 1 using an applicator, forming a coating layer. Next, the first optical component (1a) obtained in Manufacturing Example 4 was placed on the formed coating layer and cured at 25°C for 24 hours, forming a first adhesive layer (130 μm thick) between the laminate P1 and the first optical component (1a).

[0415] Through the above operations, a laminate consisting of "first optical component (1a) (thickness 85μm) / first adhesive layer (thickness 130μm) / polarizing film (thickness 45μm) / first phase retardation film (thickness 18μm) / second phase retardation film (thickness 6μm)" was obtained.

[0416] Next, the adhesive (A) obtained in Manufacturing Example 31 is applied to the side of the second phase difference film opposite to the first phase difference film to form a panel-side adhesive layer (thickness 15 μm).

[0417] Through the above operations, an optical laminate (2) was obtained, consisting of "first optical component (1a) (thickness 85μm) / first adhesive layer (thickness 130μm) / polarizing film (thickness 45μm) / first phase retardation film (thickness 18μm) / second phase retardation film (thickness 6μm) / panel side adhesive layer (thickness 15μm)".

[0418] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0419] [Example 3]

[0420] The second optical component (2) (an acrylic resin film with a glutarimide structure serving as a reinforcing layer) is bonded to the protective layer of the laminate P1 obtained in Example 1 using the adhesive (A) obtained in Manufacturing Example 31. Specifically, adhesive (A) is applied to the visible side surface of the protective layer to form a second adhesive layer with a thickness of 12 μm, and the second optical component (2) is brought into contact with the second adhesive layer and bonded to the protective layer.

[0421] Through the above operations, a laminate Q3 was obtained, consisting of "second optical component (2) (thickness 40μm) / second adhesive layer (thickness 12μm) / polarizing film (thickness 45μm) / first phase difference film (thickness 18μm) / second phase difference film (thickness 6μm)".

[0422] The release liner A is peeled off from the laminate R1 (“Release liner A / First adhesive layer (1) (thickness 12 μm) / First optical component (1a) (thickness 85 μm)”) obtained in Example 1, and the exposed first adhesive layer (1) is transferred onto the second optical component (2) of the laminate Q3.

[0423] Through the above operations, a laminate composed of "first optical component (1a) (thickness 85μm) / first adhesive layer (1) (thickness 12μm) / second optical component (2) (thickness 40μm) / second adhesive layer (thickness 12μm) / polarizing film (thickness 45μm) / first phase retardation film (thickness 18μm) / second phase retardation film (thickness 6μm)" was obtained.

[0424] Next, the adhesive (A) obtained in Manufacturing Example 31 is applied to the side of the second phase difference film opposite to the first phase difference film to form a panel-side adhesive layer (thickness 15 μm).

[0425] Through the above operations, an optical laminate (3) was obtained, consisting of the following layers: "first optical component (1a) (thickness 85μm) / first adhesive layer (1) (thickness 12μm) / second optical component (2) (thickness 40μm) / second adhesive layer (thickness 12μm) / polarizing film (thickness 45μm) / first retardation film (thickness 18μm) / second retardation film (thickness 6μm) / panel side adhesive layer (thickness 15μm)".

[0426] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0427] [Example 4]

[0428] The thickness of the first adhesive layer was changed to 80 μm, otherwise the same procedure as in Example 2 was followed.

[0429] Through the above operations, an optical laminate (4) was obtained, consisting of the following layers: "first optical component (1a) (thickness 85μm) / first adhesive layer (thickness 80μm) / polarizing film (thickness 45μm) / first phase retardation film (thickness 18μm) / second phase retardation film (thickness 6μm) / panel side adhesive layer (thickness 15μm)".

[0430] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0431] [Example 5]

[0432] Similar to Example 1, a laminate P1 consisting of a polarizing film (thickness 45 μm), a first phase retardation film (thickness 18 μm), and a second phase retardation film (thickness 6 μm) was obtained.

[0433] The adhesive composition (2) obtained in Manufacturing Example 12 was applied to the surface of the release layer of the release liner A obtained in Manufacturing Example 32 using an applicator, forming a coating layer. Next, the release liner B obtained in Manufacturing Example 33 was placed on the formed coating layer, resulting in a laminate A5. The release liner B was configured such that the release layer and the coating layer were in contact. Next, at an illuminance of 9 mW / cm²... 2 Conditions (cumulative light intensity 2700 mJ / cm) 2 Light was irradiated from one side of the release liner A of the laminate A5. This caused the coating layer to photocur, forming the laminate B5 consisting of release liner A, first adhesive layer (2) (100 μm thick), and release liner B. An LED was used as the light source. The peak wavelength of the irradiated light in the LED was 340 nm.

[0434] Next, the release liner B is peeled off from the laminate B5, and the first optical component (1d) obtained in manufacturing example 7 is disposed on the exposed surface of the first adhesive layer (2).

[0435] Through the above operations, a laminate R5 consisting of "peeling liner A / first adhesive layer (2) (thickness 100μm) / first optical component (1d) (thickness 125μm)" was obtained.

[0436] Peel the release liner A from the laminate R5 and transfer the exposed first adhesive layer (2) onto the protective layer of the laminate P1 obtained in Example 1.

[0437] Through the above operations, a laminated body composed of "first optical component (1d) (thickness 125μm) / first adhesive layer (2) (thickness 100μm) / polarizing film (thickness 45μm) / first phase difference film (thickness 18μm) / second phase difference film (thickness 6μm)" was obtained.

[0438] Next, the adhesive (A) obtained in Manufacturing Example 31 is applied to the side of the second phase difference film opposite to the first phase difference film to form a panel-side adhesive layer (thickness 15 μm).

[0439] Through the above operations, an optical laminate (5) was obtained, consisting of the following layers: "first optical component (1d) (thickness 125μm) / first adhesive layer (2) (thickness 100μm) / polarizing film (thickness 45μm) / first phase retardation film (thickness 18μm) / second phase retardation film (thickness 6μm) / panel side adhesive layer (thickness 15μm)".

[0440] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0441] [Example 6]

[0442] Similar to Example 1, a laminate P1 consisting of a polarizing film (thickness 45 μm), a first phase retardation film (thickness 18 μm), and a second phase retardation film (thickness 6 μm) was obtained.

[0443] The adhesive composition (7) obtained in Manufacturing Example 17 was applied to the surface of the release layer of the release liner A obtained in Manufacturing Example 32 using an applicator, forming a coating layer. Next, the release liner B obtained in Manufacturing Example 33 was placed on the formed coating layer, resulting in a laminate A6. The release liner B was configured such that the release layer and the coating layer were in contact. Next, at an illuminance of 9 mW / cm²... 2 Conditions (cumulative light intensity 2700 mJ / cm) 2 Light was irradiated from one side of the release liner A of the laminate A6. This caused the coating layer to photocur, forming the laminate B6 consisting of release liner A, first adhesive layer (7) (100 μm thick), and release liner B. An LED was used as the light source. The peak wavelength of the irradiated light in the LED was 340 nm.

[0444] Next, the release liner B is peeled off from the laminate B6, and the first optical component (1a) obtained in manufacturing example 4 is disposed on the exposed surface of the first adhesive layer (7).

[0445] Through the above operations, a laminate R6 consisting of "peeling liner A / first adhesive layer (7) (thickness 100μm) / first optical component (1a) (thickness 85μm)" was obtained.

[0446] Peel the release liner A from the laminate R6 and transfer the exposed first adhesive layer (7) onto the protective layer of the laminate P1 obtained in Example 1.

[0447] Through the above operations, a laminate consisting of "first optical component (1a) (thickness 85μm) / first adhesive layer (7) (thickness 100μm) / polarizing film (thickness 45μm) / first phase difference film (thickness 18μm) / second phase difference film (thickness 6μm)" was obtained.

[0448] Next, the adhesive (A) obtained in Manufacturing Example 31 is applied to the side of the second phase difference film opposite to the first phase difference film to form a panel-side adhesive layer (thickness 15 μm).

[0449] Through the above operations, an optical laminate (6) was obtained, consisting of the following layers: "first optical component (1a) (thickness 85μm) / first adhesive layer (7) (thickness 100μm) / polarizing film (thickness 45μm) / first phase retardation film (thickness 18μm) / second phase retardation film (thickness 6μm) / panel side adhesive layer (thickness 15μm)".

[0450] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0451] [Example 7]

[0452] The adhesive composition (2) obtained in Manufacturing Example 12 was used instead of the adhesive composition (7) obtained in Manufacturing Example 17, and otherwise the same procedure was followed as in Example 6.

[0453] Through the above operations, an optical laminate (7) was obtained, consisting of the following layers: "first optical component (1a) (thickness 85μm) / first adhesive layer (2) (thickness 100μm) / polarizing film (thickness 45μm) / first phase retardation film (thickness 18μm) / second phase retardation film (thickness 6μm) / panel side adhesive layer (thickness 15μm)".

[0454] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0455] [Example 8]

[0456] The adhesive composition (10) obtained in Manufacturing Example 20 was used instead of the adhesive composition (7) obtained in Manufacturing Example 17, and otherwise the same procedure was followed as in Example 6.

[0457] Through the above operations, an optical laminate (8) was obtained, consisting of the following layers: "first optical component (1a) (thickness 85μm) / first adhesive layer (10) (thickness 100μm) / polarizing film (thickness 45μm) / first retardation film (thickness 18μm) / second retardation film (thickness 6μm) / panel side adhesive layer (thickness 15μm)".

[0458] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0459] [Example 9]

[0460] The adhesive composition (8) obtained in Manufacturing Example 18 was used instead of the adhesive composition (7) obtained in Manufacturing Example 17, and otherwise the same procedure was followed as in Example 6.

[0461] Through the above operations, an optical laminate (9) was obtained, consisting of the following layers: "first optical component (1a) (thickness 85μm) / first adhesive layer (8) (thickness 100μm) / polarizing film (thickness 45μm) / first phase retardation film (thickness 18μm) / second phase retardation film (thickness 6μm) / panel side adhesive layer (thickness 15μm)".

[0462] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0463] [Example 10]

[0464] The adhesive composition (3) obtained in Manufacturing Example 13 was used instead of the adhesive composition (7) obtained in Manufacturing Example 17, and otherwise the same procedure was followed as in Example 6.

[0465] Through the above operations, an optical laminate (10) was obtained, consisting of the following layers: "first optical component (1a) (thickness 85 μm) / first adhesive layer (3) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel side adhesive layer (thickness 15 μm)".

[0466] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0467] [Example 11]

[0468] The adhesive composition (11) obtained in Manufacturing Example 21 was used instead of the adhesive composition (7) obtained in Manufacturing Example 17, and otherwise the same procedure was followed as in Example 6.

[0469] Through the above operations, an optical laminate (11) was obtained, consisting of the following layers: "first optical component (1a) (thickness 85 μm) / first adhesive layer (11) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel side adhesive layer (thickness 15 μm)".

[0470] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0471] [Example 12]

[0472] The adhesive composition (4) obtained in Manufacturing Example 14 was used instead of the adhesive composition (7) obtained in Manufacturing Example 17, and otherwise the same procedure was followed as in Example 6.

[0473] Through the above operations, an optical laminate (12) was obtained, consisting of the following layers: "first optical component (1a) (thickness 85μm) / first adhesive layer (4) (thickness 100μm) / polarizing film (thickness 45μm) / first retardation film (thickness 18μm) / second retardation film (thickness 6μm) / panel side adhesive layer (thickness 15μm)".

[0474] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0475] [Example 13]

[0476] The adhesive composition (13) obtained in Manufacturing Example 23 was used instead of the adhesive composition (7) obtained in Manufacturing Example 17, and otherwise the same procedure was followed as in Example 6.

[0477] Through the above operations, an optical laminate (13) was obtained, consisting of the following layers: "first optical component (1a) (thickness 85 μm) / first adhesive layer (13) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel side adhesive layer (thickness 15 μm)".

[0478] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0479] [Example 14]

[0480] The adhesive composition (15) obtained in Manufacturing Example 25 was used instead of the adhesive composition (7) obtained in Manufacturing Example 17, and otherwise the same procedure was followed as in Example 6.

[0481] Through the above operations, an optical laminate (14) was obtained, consisting of the following layers: "first optical component (1a) (thickness 85 μm) / first adhesive layer (15) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel side adhesive layer (thickness 15 μm)".

[0482] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0483] [Example 15]

[0484] The adhesive composition (16) obtained in Manufacturing Example 26 was used instead of the adhesive composition (7) obtained in Manufacturing Example 17, and otherwise the same procedure was followed as in Example 6.

[0485] Through the above operations, an optical laminate (15) was obtained, consisting of the following layers: "first optical component (1a) (thickness 85 μm) / first adhesive layer (16) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel side adhesive layer (thickness 15 μm)".

[0486] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0487] [Example 16]

[0488] Similar to Example 1, a laminate P1 consisting of a polarizing film (thickness 45 μm), a first phase retardation film (thickness 18 μm), and a second phase retardation film (thickness 6 μm) was obtained.

[0489] The adhesive composition (17) obtained in Manufacturing Example 27 was separately applied using an applicator to the release-treated surface of a first release liner (trade name "Diafoil MRF", thickness 75 μm, manufactured by Mitsubishi Chemical Corporation) having a release-treated surface on one side, forming a coating layer. Next, the release-treated surface of a second release liner (trade name "Diafoil MRE", thickness 75 μm, manufactured by Mitsubishi Chemical Corporation) having a release-treated surface on one side was bonded onto the coating layer formed on the first release liner. Then, under an illuminance of 9 mW / cm², the adhesive composition (17) obtained in Manufacturing Example 27 was applied to the release-treated surface of a first release liner. 2 Conditions (cumulative light intensity 2700 mJ / cm) 2The coating layer between the release liner layers was irradiated with light from the side of the first release liner. This caused the coating layer to photocur, forming a laminate consisting of the first release liner / first adhesive layer precursor (17) (80 μm thick) / second release liner. An LED was used as the light source. The peak wavelength of the irradiated light in the LED was 340 nm.

[0490] Next, the second release liner was peeled off from the obtained laminate, and the additive solution (1) obtained in Manufacturing Example 30 was applied to the exposed surface of the first adhesive layer precursor (17). The amount of additive solution (1) applied was determined such that the total amount of additive in the additive solution (1) was 20 parts by weight relative to 80 parts by weight of the adhesive composition (17) used to form the first adhesive layer precursor (17), resulting in a coating thickness of approximately 50 μm. The coating was performed using a rod applicator RDS No. 30 manufactured by RDSPECIALTIES. Next, a drying process was performed in a dryer at 110°C for 3 minutes. Through the coating process and drying process, the components of the additive were impregnated into the first adhesive layer precursor (17), and the solvent was vaporized. The first adhesive layer precursor (17) was transformed into a photocurable first adhesive layer precursor (17a) through the impregnation of the components of the additive.

[0491] Next, a third release liner (trade name "Diafoil MRE", thickness 75 μm, manufactured by Mitsubishi Chemical Corporation) with a release-treated surface on one side is bonded to the light-curable first adhesive layer precursor (17a) on the first release liner.

[0492] Next, a black light (manufactured by Toshiba Corporation, wavelength 320nm~400nm, illuminance 2.5mW / cm²) was used. 2 Cumulative light intensity 2400 mJ / cm 2 The photocurable first adhesive layer precursor (17a) between the release liner layers was irradiated with light from the first release liner side. As a result, the photocurable first adhesive layer precursor (17a) was photocured, forming a laminate B16 consisting of the first release liner / first adhesive layer (17a) (100 μm thick) / third release liner.

[0493] Next, the third release liner is peeled off from the laminate B16, and the first optical component (1a) obtained in manufacturing example 4 is disposed on the exposed surface of the first adhesive layer (17a).

[0494] Through the above operations, a laminate R16 was obtained, consisting of a first release liner, a first adhesive layer (17a) (100 μm thick), and a first optical component (1a) (85 μm thick).

[0495] Peel the first release liner from the laminate R16 and transfer the exposed first adhesive layer (17a) onto the protective layer of the laminate P1 obtained in Example 1.

[0496] Through the above operations, a laminate consisting of "first optical component (1a) (thickness 85μm) / first adhesive layer (17a) (thickness 100μm) / polarizing film (thickness 45μm) / first phase retardation film (thickness 18μm) / second phase retardation film (thickness 6μm)" was obtained.

[0497] Next, the adhesive (A) obtained in Manufacturing Example 31 is applied to the side of the second phase difference film opposite to the first phase difference film to form a panel-side adhesive layer (thickness 15 μm).

[0498] Through the above operations, an optical laminate (16) was obtained, consisting of the following layers: "first optical component (1a) (thickness 85μm) / first adhesive layer (17a) (thickness 100μm) / polarizing film (thickness 45μm) / first retardation film (thickness 18μm) / second retardation film (thickness 6μm) / panel side adhesive layer (thickness 15μm)".

[0499] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0500] [Example 17]

[0501] The adhesive composition (18) obtained in Manufacturing Example 28 was used instead of the adhesive composition (17) obtained in Manufacturing Example 27. Otherwise, the process was carried out in the same manner as in Example 16, and a laminate consisting of a first release liner / first adhesive layer precursor (18) (thickness 90 μm) / second release liner was formed.

[0502] Next, the second release liner was peeled off from the obtained laminate, and the additive solution (1) obtained in Manufacturing Example 30 was applied to the exposed surface of the first adhesive layer precursor (18). The amount of additive solution (1) applied was determined such that the total amount of additive in the additive solution (1) was 10 parts by weight relative to 90 parts by weight of the adhesive composition (18) used to form the first adhesive layer precursor (18), resulting in a coating thickness of approximately 25 μm. The coating was performed using a rod applicator RDS No. 30 manufactured by RDSPECIALTIES. Next, a drying process was performed in a dryer at 110°C for 3 minutes. Through the coating process and the drying process, the components of the additive were impregnated into the first adhesive layer precursor (18), and the solvent was vaporized. The first adhesive layer precursor (18) was transformed into a photocurable first adhesive layer precursor (18a) through the impregnation of the components of the additive.

[0503] Then, in the same manner as in Example 16, an optical laminate (17) was obtained consisting of a first optical component (1a) (thickness 85 μm) / a first adhesive layer (18a) (thickness 100 μm) / a polarizing film (thickness 45 μm) / a first retardation film (thickness 18 μm) / a second retardation film (thickness 6 μm) / a panel-side adhesive layer (thickness 15 μm)

[0504] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0505] [Example 18]

[0506] The thickness of the first adhesive layer precursor (18) was changed from 90 μm to 80 μm. Furthermore, the coating amount of the additive solution (1) was determined such that the total amount of additives in the additive solution (1) was 20 parts by weight relative to 80 parts by weight of the adhesive composition (18) used to form the first adhesive layer precursor (18), and the coating thickness was set to about 50 μm. Otherwise, the process was carried out in the same manner as in Example 17, and an optical laminate (18) consisting of a first optical component (1a) (thickness 85 μm) / first adhesive layer (18b) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel side adhesive layer (thickness 15 μm) was obtained.

[0507] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0508] [Example 19]

[0509] The adhesive composition (19) obtained in Manufacturing Example 29 was used instead of the adhesive composition (18) obtained in Manufacturing Example 28. Otherwise, the process was carried out in the same manner as in Example 17, and an optical laminate (19) consisting of "first optical component (1a) (thickness 85 μm) / first adhesive layer (19a) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel side adhesive layer (thickness 15 μm)" was obtained.

[0510] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0511] [Example 20]

[0512] The adhesive composition (19) obtained in Manufacturing Example 29 was used instead of the adhesive composition (18) obtained in Manufacturing Example 28. Otherwise, the process was carried out in the same manner as in Example 18, and an optical laminate (20) consisting of a first optical component (1a) (thickness 85 μm) / first adhesive layer (19b) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel side adhesive layer (thickness 15 μm) was obtained.

[0513] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0514] [Comparative Example 1]

[0515] The adhesive composition (9) obtained in Manufacturing Example 19 was used instead of the adhesive composition (7) obtained in Manufacturing Example 17, and otherwise the same procedure was followed as in Example 6.

[0516] Through the above operations, an optical laminate (C1) was obtained, consisting of "first optical component (1a) (thickness 85μm) / first adhesive layer (9) (thickness 100μm) / polarizing film (thickness 45μm) / first retardation film (thickness 18μm) / second retardation film (thickness 6μm) / panel side adhesive layer (thickness 15μm)".

[0517] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0518] [Comparative Example 2]

[0519] The adhesive composition (12) obtained in Manufacturing Example 22 was used instead of the adhesive composition (7) obtained in Manufacturing Example 17, and otherwise the same procedure was followed as in Example 6.

[0520] Through the above operations, an optical laminate (C2) was obtained, consisting of "first optical component (1a) (thickness 85μm) / first adhesive layer (12) (thickness 100μm) / polarizing film (thickness 45μm) / first retardation film (thickness 18μm) / second retardation film (thickness 6μm) / panel side adhesive layer (thickness 15μm)".

[0521] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0522] [Comparative Example 3]

[0523] The adhesive composition (5) obtained in Manufacturing Example 15 was used instead of the adhesive composition (7) obtained in Manufacturing Example 17, and otherwise the same procedure was followed as in Example 6.

[0524] Through the above operations, an optical laminate (C3) was obtained, consisting of the following layers: "first optical component (1a) (thickness 85μm) / first adhesive layer (5) (thickness 100μm) / polarizing film (thickness 45μm) / first retardation film (thickness 18μm) / second retardation film (thickness 6μm) / panel side adhesive layer (thickness 15μm)".

[0525] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0526] [Comparative Example 4]

[0527] The adhesive composition (14) obtained in Manufacturing Example 24 was used instead of the adhesive composition (7) obtained in Manufacturing Example 17, and otherwise the same procedure was followed as in Example 6.

[0528] Through the above operations, an optical laminate (C4) was obtained, consisting of "first optical component (1a) (thickness 85μm) / first adhesive layer (14) (thickness 100μm) / polarizing film (thickness 45μm) / first retardation film (thickness 18μm) / second retardation film (thickness 6μm) / panel side adhesive layer (thickness 15μm)".

[0529] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0530] [Comparative Example 5]

[0531] The adhesive composition (6) obtained in Manufacturing Example 16 was used instead of the adhesive composition (7) obtained in Manufacturing Example 17, and otherwise the same procedure was followed as in Example 6.

[0532] Through the above operations, an optical laminate (C5) was obtained, consisting of "first optical component (1a) (thickness 85μm) / first adhesive layer (6) (thickness 100μm) / polarizing film (thickness 45μm) / first retardation film (thickness 18μm) / second retardation film (thickness 6μm) / panel side adhesive layer (thickness 15μm)".

[0533] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0534] [Comparative Example 6]

[0535] The adhesive composition (1) obtained in Manufacturing Example 11 was used instead of the adhesive composition (7) obtained in Manufacturing Example 17, and otherwise the same procedure was followed as in Example 6.

[0536] Through the above operations, an optical laminate (C6) was obtained, consisting of "first optical component (1a) (thickness 85μm) / first adhesive layer (1) (thickness 100μm) / polarizing film (thickness 45μm) / first retardation film (thickness 18μm) / second retardation film (thickness 6μm) / panel side adhesive layer (thickness 15μm)".

[0537] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0538] [Comparative Example 7]

[0539] The first optical component (1c) obtained in Manufacturing Example 6 was used instead of the first optical component (1d) obtained in Manufacturing Example 7, and otherwise, it was carried out in the same manner as in Example 5.

[0540] Through the above operations, an optical laminate (C7) was obtained, consisting of "first optical component (1c) (thickness 75μm) / first adhesive layer (2) (thickness 100μm) / polarizing film (thickness 45μm) / first retardation film (thickness 18μm) / second retardation film (thickness 6μm) / panel side adhesive layer (thickness 15μm)".

[0541] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0542] [Comparative Example 8]

[0543] The first optical component (1b) obtained in Manufacturing Example 5 was used instead of the first optical component (1d) obtained in Manufacturing Example 7, and otherwise the same procedure was followed as in Example 5.

[0544] Through the above operations, an optical laminate (C8) was obtained, consisting of "first optical component (1b) (thickness 25μm) / first adhesive layer (2) (thickness 100μm) / polarizing film (thickness 45μm) / first retardation film (thickness 18μm) / second retardation film (thickness 6μm) / panel side adhesive layer (thickness 15μm)".

[0545] The results are shown in Table 1. Additionally, the layered configurations are shown in Table 2.

[0546]

[0547]

[0548] Industrial applicability

[0549] The optical laminate of the embodiments of the present invention can be used in image display devices (typically liquid crystal display devices and organic EL display devices).

Claims

1. An optical laminate comprising a polarizing film and an adhesive layer, in, When a puncture test is conducted using a puncture instrument with a front-end curvature radius R of 550 μm, and the load after reaching the maximum load Fp (kgf) and holding it for 15 seconds is defined as F (kgf), the displacement at the point of reaching the maximum load Fp (kgf) is defined as L (μm), and the total thickness of the optical laminate is defined as T (μm), The residual stress attenuation rate ΔF (%) calculated by equation (1) and the maximum strain rate ΔL (%) calculated by equation (2) satisfy at least one of ΔF ≤ 42 and ΔL < 80. Formula (1): ΔF=[(Fp-F) / Fp]×100; Equation (2): ΔL=(L / T)×100.

2. The optical laminate according to claim 1, wherein, The total thickness of the optical laminate is 200 μm or more.

3. The optical laminate according to claim 1, comprising a first optical element attached to the visible side of the polarizing film via a first adhesive layer.

4. The optical laminate according to claim 1, comprising a second optical member attached to the visible side of the polarizing film via a second adhesive layer, and a first optical member attached to the visible side of the second optical member via a first adhesive layer.

5. The optical laminate according to claim 1, comprising a third optical member attached to the visible side of the polarizing film via a third adhesive layer, a second optical member attached to the visible side of the third optical member via a second adhesive layer, and a first optical member attached to the visible side of the second optical member via a first adhesive layer.

6. An image display device comprising the optical laminate according to any one of claims 1 to 5.

Images