Optical laminate and image display device

Abstract

Provided is an optical laminate including a polarizing film and an adhesive layer, the optical laminate making it possible to suppress the occurrence of light leakage due to a localized load weight and suppress peeling between the adhesive layer and a layer adjacent thereto. Also provided is an image display device including such an optical laminate.　An optical laminate according to an embodiment of the present invention is an optical laminate including a polarizing film and an adhesive layer, wherein when a piercing test is performed using a piercing jig in which the curvature radius R of the tip is 550 μm, the load after holding for 15 seconds after reaching a maximum load Fp (kgf) is denoted by F (kgf), the displacement amount when the maximum load Fp (kgf) is reached is denoted by L (μm), and the total thickness of the optical laminate is denoted by T (μm), at least one of ΔF ≤ 42 and ΔL < 80 is satisfied with respect to a residual stress attenuation rate ΔF (%) calculated by a predetermined formula and a maximum distortion rate ΔL (%) calculated by a predetermined formula.

Description

Optical laminate and image display device

[0001] The present invention relates to an optical laminate and an image display device.

[0002] In many image display devices (liquid crystal display devices, organic EL display devices, quantum dot display devices, etc.), a polarizing film is disposed on at least one side of a display cell due to the image formation method used. It is widely known that the polarizing film disposed on the viewing side of the image display device is provided with an optical member such as an anti-reflection layer or an anti-glare layer on the viewing side to prevent reflection or glare of external light on the display screen (Patent Document 1).

[0003] Foldable image display devices, such as laptop computers, that have an image display unit disposed on the inside when folded are widely used. However, if such an image display device is folded with a foreign object trapped inside, a local load caused by the foreign object is applied to the image display unit. This local load can damage a polarizing film or the like, resulting in a problem of light leakage in the image display unit.

[0004] In order to suppress the occurrence of light leakage in the image display section due to a local load, it is conceivable to increase the resistance to the load by, for example, hardening the pressure-sensitive adhesive layer disposed on the viewing side of the polarizing film. However, when the pressure-sensitive adhesive layer is hardened, the viscosity decreases, resulting in a problem of peeling between the pressure-sensitive adhesive layer and an adjacent layer.

[0005] Japanese Patent Application Laid-Open No. 2018-155998

[0006] An object of the present invention is to provide an optical laminate including a polarizing film and a pressure-sensitive adhesive layer, which can suppress the occurrence of light leakage due to a local load and can suppress peeling between the pressure-sensitive adhesive layer and an adjacent layer, and also to provide an image display device including such an optical laminate.

[0007] [1] An optical laminate according to an embodiment of the present invention is an optical laminate including a polarizing film and a pressure-sensitive adhesive layer, and is subjected to a piercing test using a piercing jig having a tip end with a radius of curvature R of 550 μm, and wherein the load after reaching a maximum load Fp (kgf) and maintaining it for 15 seconds is defined as F (kgf), the amount of displacement at the time when the maximum load Fp (kgf) is reached 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 formula (1) and the maximum strain rate ΔL (%) calculated by formula (2) satisfy at least one of ΔF≦42 and ΔL<80. Formula (1): ΔF=[(Fp−F) / Fp]×100 Formula (2): ΔL=(L / T)×100 [2] In the optical laminate according to the above item [1], the total thickness of the optical laminate may be 200 μm or more. [3] The optical laminate according to [1] or [2] above may further include a first optical member bonded to the viewing side of the polarizing film via a first adhesive layer. [4] The optical laminate according to [1] or [2] above may further include a second optical member bonded to the viewing side of the polarizing film via a second adhesive layer, and a first optical member bonded to the viewing side of the second optical member via a first adhesive layer. [5] The optical laminate according to [1] or [2] above may further include a third optical member bonded to the viewing side of the polarizing film via a third adhesive layer, a second optical member bonded to the viewing side of the third optical member via a second adhesive layer, and a first optical member bonded to the viewing side of the second optical member via a first adhesive layer. [6] An image display device according to an embodiment of the present invention includes the optical laminate according to any one of [1] to [5] above.

[0008] According to an embodiment of the present invention, it is possible to provide an optical laminate including a polarizing film and a pressure-sensitive adhesive layer, which can suppress light leakage due to a local load and can suppress peeling between the pressure-sensitive adhesive layer and an adjacent layer, and also to provide an image display device including such an optical laminate.

[0009] Fig. 1 is a schematic cross-sectional view of an optical laminate according to one embodiment of the present invention. Fig. 2 is a schematic cross-sectional view of an optical laminate according to another embodiment of the present invention. Fig. 3 is a schematic cross-sectional view of an optical laminate according to yet another embodiment of the present invention. Fig. 4 is a schematic explanatory view illustrating a maximum load Fp and a load F in a puncture test.

[0010] [Terminology] In this specification, when the expression "weight" appears, it may be read as "mass," which is commonly used as an SI unit indicating weight, and vice versa.

[0011] In this specification, the expression "(meth)acrylic" means "acrylic and / or methacrylic", the expression "(meth)acrylate" means "acrylate and / or methacrylate", the expression "(meth)allyl" means "allyl and / or methallyl", and the expression "(meth)acrolein" means "acrolein and / or methacrolein".

[0012] In this specification, with regard to the refractive indices (nx, ny, nz), "nx" is the refractive index in the direction in which the in-plane refractive index is maximum (i.e., the slow axis direction), "ny" is the refractive index in the in-plane direction perpendicular 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.

[0013] In this specification, with regard to the in-plane retardation (Re), "Re(λ)" is the in-plane retardation of a film measured with light having a wavelength of λ nm at 23° C. For example, "Re(550)" is the in-plane retardation of a film measured with light having a wavelength of 550 nm at 23° C. Re(λ) can be calculated by the formula: Re=(nx-ny)×d, where d (nm) is the thickness of the film.

[0014] In this specification, with regard to the thickness direction retardation (Rth), "Rth(λ)" is the retardation in the thickness direction of a film measured with light having a wavelength of λ nm at 23° C. For example, "Rth(550)" is the retardation in the thickness direction of a film measured with light having a wavelength of 550 nm at 23° C. Rth(λ) is calculated by the formula: Rth=(nx-nz)×d, where d (nm) is the thickness of the film.

[0015] In this specification, the "Nz coefficient" is calculated by Nz=Rth / Re.

[0016] When angles are referred to herein, unless otherwise specified, the angles include angles in both clockwise and counterclockwise directions.

[0017] <<1. Optical Laminate>> An optical laminate according to an embodiment of the present invention is an optical laminate including a polarizing film and a pressure-sensitive adhesive layer. The optical laminate according to an embodiment of the present invention may include any appropriate other member as long as the effects of the present invention are not impaired, as long as the optical laminate includes a polarizing film and a pressure-sensitive adhesive layer. In this specification, the pressure-sensitive adhesive layer means at least one layer selected from the group consisting of a pressure-sensitive adhesive layer and an adhesive layer.

[0018] An optical laminate according to an embodiment of the present invention is subjected to a piercing test using a piercing jig having a tip curvature radius R of 550 μm, and when the load after reaching the maximum load Fp (kgf) and maintaining it for 15 seconds is defined as F (kgf), the amount of displacement when the maximum load Fp (kgf) is reached 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 formula (1) and the maximum strain rate ΔL (%) calculated by formula (2) satisfy at least one of ΔF≦42 and ΔL<80. Formula (1): ΔF=[(Fp−F) / Fp]×100 Formula (2): ΔL=(L / T)×100

[0019] In the embodiment 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 may be greater than 42, and when ΔF≦42, ΔL may be greater than 80.

[0020] The load F is an index of the residual stress due to the puncture test. When the residual stress is large, i.e., when the residual stress attenuation factor ΔF is small, the deformation due to the puncture test is likely to return to its original state after the load is released. From this, it was thought that the occurrence of light leakage due to a local applied load could be suppressed by appropriately adjusting the residual stress attenuation factor ΔF, and as a result of extensive investigations, it was found that the occurrence of light leakage due to a local applied load could be suppressed by setting ΔF to a predetermined amount or less. Furthermore, it was thought that when peeling occurs between the pressure-sensitive adhesive layer and the adjacent layer, the applied load in the puncture test is dispersed depending on the peeled portion, resulting in a small measured residual stress. As a result of extensive investigations, it was found that the occurrence of peeling between the pressure-sensitive adhesive layer and the adjacent layer could be suppressed by setting ΔF to a predetermined amount or less.

[0021] ΔF is 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, but ΔF may be 1≦ΔF, 5≦ΔF, 10≦ΔF, 15≦ΔF, or 20≦ΔF.

[0022] The displacement L is an index of the resistance to deformation in the piercing test. Furthermore, we conducted extensive research, based on the idea that small deformation, i.e., a small maximum strain rate ΔL, would reduce damage to the polarizing film and other components due to localized applied loads. As a result, we found that even if the residual stress decay rate ΔF is large, by appropriately adjusting ΔL, it is possible to suppress the occurrence of light leakage due to localized applied loads.

[0023] ΔL is 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, but it may be 1≦ΔL, 10≦ΔL, 20≦ΔL, 30≦ΔL, or 40≦ΔL.

[0024]

[0046] From the above-mentioned studies, it has been found that in the embodiments of the present invention, the effects of the present invention are exerted by satisfying at least one of ΔF≦42 and ΔL<80, and the optical laminate according to the embodiments of the present invention can suppress the occurrence of light leakage in the image display section due to a localized applied load, and can suppress peeling between the pressure-sensitive adhesive layer and the layer adjacent thereto.

[0025] <1-1. Overall Structure of Optical Laminate> FIG. 1 is a schematic cross-sectional view of an optical laminate according to one embodiment of the present invention. The optical laminate 100 shown in FIG. 1 includes a polarizing film 10 and a first optical member 31 bonded to the viewing side of the polarizing film 10 via a first pressure-sensitive adhesive layer 21. As shown in FIG. 1, the polarizing film 10 may further include, in this order from the polarizing film 10 side, a first retardation film 40 and a second retardation film 50 on the side opposite the viewing side. As shown in FIG. 1, the optical laminate 100 may further include a panel-side pressure-sensitive adhesive layer 60. The panel-side pressure-sensitive adhesive layer 60 is disposed on the opposite side of the second retardation film 50 from the first retardation film 40. When the optical laminate 100 includes the panel-side pressure-sensitive adhesive layer 60, the panel-side pressure-sensitive adhesive layer 60 enables the optical laminate 100 to be attached to an image display cell. That is, the optical laminate 100 shown in FIG. 1 has a configuration of, in order from the viewing side, a first optical member 31 / a first pressure-sensitive adhesive layer 21 / a polarizing film 10 / a first retardation film 40 / a second retardation film 50 / a panel-side pressure-sensitive adhesive layer 60.

[0026] FIG. 2 is a schematic cross-sectional view of an optical laminate according to another embodiment of the present invention. The optical laminate 100 shown in FIG. 2 includes a polarizing film 10, a second optical member 32 bonded to the viewing side of the polarizing film 10 via a second adhesive layer 22, and a first optical member 31 bonded to the viewing side of the second optical member 32 via a first adhesive layer 21. As shown in FIG. 2, the polarizing film 10 may further include, in this order from the polarizing film 10 side, a first retardation film 40 and a second retardation film 50 on the side opposite the viewing side. As shown in FIG. 2, the optical laminate 100 may further include a panel-side pressure-sensitive adhesive layer 60. The panel-side pressure-sensitive adhesive layer 60 is disposed on the opposite side of the second retardation film 50 from the first retardation film 40. When the optical laminate 100 includes the panel-side pressure-sensitive adhesive layer 60, the panel-side pressure-sensitive adhesive layer 60 enables the optical laminate 100 to be attached to an image display cell. That is, the optical laminate 100 shown in FIG. 2 has a configuration of, in order from the viewing side, a first optical member 31 / a first adhesive layer 21 / a second optical member 32 / a second adhesive layer 22 / a polarizing film 10 / a first retardation film 40 / a second retardation film 50 / a panel-side adhesive layer 60.

[0027] Fig. 3 is a schematic cross-sectional view of an optical laminate according to yet another embodiment of the present invention. The optical laminate 100 shown in Fig. 3 includes a polarizing film 10, a third optical member 33 bonded to the viewing side of the polarizing film 10 via a third adhesive layer 23, a second optical member 32 bonded to the viewing side of the third optical member 33 via a second adhesive layer 22, and a first optical member 31 bonded to the viewing side of the second optical member 32 via a first adhesive layer 21. As shown in Fig. 3, the polarizing film 10 may further include, in order from the polarizing film 10 side, a first retardation film 40 and a second retardation film 50 on the side opposite the viewing side. As shown in Fig. 3, the optical laminate 100 may further include a panel-side adhesive layer 60. The panel-side adhesive layer 60 is disposed on the opposite side of the first retardation film 40 with respect to the second retardation film 50. When the optical laminate 100 includes the panel-side pressure-sensitive adhesive layer 60, the optical laminate 100 can be attached to an image display cell by the panel-side pressure-sensitive adhesive layer 60. That is, the optical laminate 100 shown in Fig. 3 has a configuration of, in order from the viewing side, a first optical member 31 / a first adhesive layer 21 / a second optical member 32 / a second adhesive layer 22 / a third optical member 33 / a third adhesive layer 23 / a polarizing film 10 / a first retardation film 40 / a second retardation film 50 / a panel-side adhesive layer 60.

[0028] The optical laminate according to an embodiment of the present invention may have any appropriate configuration as long as it includes a polarizing film and a pressure-sensitive adhesive layer, but representative configurations are those shown in Figures 1 to 3 above, with the configuration shown in Figure 1 being particularly preferred. The configuration shown in Figure 1 (configuration of first optical member 31 / first pressure-sensitive adhesive layer 21 / polarizing film 10) can reduce the number of components provided between the first optical member 31 and the polarizing film 10, which can be advantageous from the standpoints of cost and the environment. For example, the configuration shown in Figure 1 is preferred because it reduces the number of lamination steps required for the optical laminate.

[0029] The total thickness of the optical laminate 100 according to an embodiment of the present invention may be any appropriate total thickness as long as the effects of the present invention are not impaired. In order to further exhibit the effects of the present invention, the total thickness of the optical laminate according to an embodiment 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.

[0030] In the optical laminate 100 according to the embodiment of the present invention, any appropriate total thickness may be adopted as the thickness of the first pressure-sensitive adhesive layer 21 as long as the effects of the present invention are not impaired. In terms of further exhibiting the effects of the present invention, the thickness of the first pressure-sensitive 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.

[0031] In the optical laminate 100 according to the embodiment of the present invention, any appropriate total thickness may be adopted as the thickness of the second pressure-sensitive adhesive layer 22 as long as the effects of the present invention are not impaired. In terms of further exhibiting the effects of the present invention, the thickness of the second pressure-sensitive adhesive layer 22 is preferably 5 μm to 20 μm, more preferably 5 μm to 17 μm, even more preferably 5 μm to 16 μm, particularly preferably 5 μm to 15 μm, and most preferably 5 μm to 14 μm.

[0032] In the optical laminate 100 according to the embodiment of the present invention, any appropriate total thickness may be adopted as the thickness of the third adhesive layer 23 as long as it does not impair the effects of the present invention. In terms of further exhibiting 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, even more preferably 5 μm to 16 μm, particularly preferably 5 μm to 15 μm, and most preferably 5 μm to 14 μm.

[0033] Any appropriate refractive index characteristic can be adopted as the refractive index characteristic of the first retardation film 40 as long as the effects of the present invention are not impaired. The refractive index characteristic of such a first retardation film 40 is preferably a refractive index characteristic of nx>ny>nz. Such a refractive index characteristic can impart a desired optical compensation function to the optical laminate 100.

[0034] Any appropriate refractive index characteristic can be adopted as the refractive index characteristic of the second retardation film 50 as long as the effects of the present invention are not impaired. The refractive index characteristic of such a second retardation film 50 is preferably nz>nx>ny. Such a refractive index characteristic can impart a desired optical compensation function to the optical laminate 100.

[0035] The components of the optical laminate will be described below.

[0036] 1-2. Polarizing Film The polarizing film 10 typically includes a polarizer and a protective layer disposed on the viewing side of the polarizer. The protective layer is typically attached to the viewing side of the polarizer via any appropriate pressure-sensitive adhesive layer (not shown). That is, the polarizing film 10 may be composed of a polarizer, a pressure-sensitive adhesive layer, and a protective layer.

[0037] 1 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 may be pressure-sensitively bonded to the first adhesive layer 21. The polarizing film 10 may further include a second protective layer on the side opposite to the viewing side of the polarizer.

[0038] <1-2-a. Polarizer> Any appropriate polarizer can be used as the polarizer. For example, the resin film forming the polarizer may be a single-layer resin film or a laminate of two or more layers.

[0039] A specific example of a polarizer composed of a single-layer resin film is a PVA-based resin film that has been subjected to a dyeing treatment with iodine and a stretching treatment (typically, uniaxial stretching). Dyeing with iodine is performed, for example, by immersing the PVA-based resin film in an iodine aqueous solution. The stretching ratio is preferably 3 to 7 times. Stretching may be performed after the dyeing treatment or while dyeing. Alternatively, the film may be dyed after stretching. If necessary, the PVA-based resin film may be subjected to a swelling treatment, a crosslinking treatment, a washing treatment, a drying treatment, or the like. For example, by immersing the PVA-based resin film in water and washing it before dyeing, it is possible to clean off stains and antiblocking agents on the surface of the PVA-based resin film and also to swell the PVA-based resin film, thereby preventing uneven dyeing and the like.

[0040] Specific examples of polarizers composed of a laminate of two or more layers include a polarizer composed of a laminate of a resin substrate and a PVA-based resin layer (PVA-based resin film) laminated on the resin substrate, or a polarizer composed of a laminate of a resin substrate and a PVA-based resin layer coated on the resin substrate. A polarizer composed of a laminate of a resin substrate and a PVA-based resin layer coated on the resin substrate can be produced, for example, by applying a PVA-based resin solution to the resin substrate and drying the solution to form a PVA-based resin layer on the resin substrate, thereby obtaining a laminate of the resin substrate and the PVA-based resin layer, and then stretching and dyeing the laminate to form the PVA-based resin layer into a polarizer. In a preferred embodiment, a polyvinyl alcohol-based resin layer containing a halide and a polyvinyl alcohol-based resin is formed on one side of the resin substrate. Stretching typically involves immersing the laminate in an aqueous boric acid solution to stretch it. Furthermore, the stretching may further include, if necessary, in-air stretching of the laminate at a high temperature (e.g., 95°C or higher) before stretching in the boric acid aqueous solution. In addition, in a preferred embodiment, the laminate is subjected to a drying shrinkage treatment in which the laminate is heated while being transported in the longitudinal direction, thereby shrinking the laminate by 2% or more in the width direction. Typically, the laminate is subjected to an in-air auxiliary stretching treatment, a dyeing treatment, an underwater stretching treatment, and a drying shrinkage treatment, in this order. By introducing auxiliary stretching, it is possible to increase the crystallinity of the PVA, even when the PVA is coated on a thermoplastic resin, thereby achieving high optical properties. Furthermore, by simultaneously increasing the orientation of the PVA in advance, problems such as a decrease in orientation or dissolution of the PVA when immersed in water in the subsequent dyeing or stretching steps can be prevented, thereby achieving high optical properties. Furthermore, when the PVA-based resin layer is immersed in a liquid, the disordering of the polyvinyl alcohol molecules and the decrease in orientation can be suppressed compared to when the PVA-based resin layer does not contain a halide. This can improve the optical properties of a polarizer obtained through a treatment step in which the laminate is immersed in a liquid, such as a dyeing treatment and an underwater stretching treatment.Furthermore, by shrinking the laminate in the width direction through a drying shrinkage treatment, the optical properties can be improved.The obtained resin substrate / polarizer laminate may be used as is (i.e., the resin substrate may be used as a protective layer for the polarizer), or the resin substrate may be peeled off from the resin substrate / polarizer laminate, and any appropriate protective layer depending on the purpose may be laminated on the peeled surface. Details of such a method for producing a polarizer are described in, for example, JP-A-2012-73580 and Japanese Patent No. 6,470,455. The entire disclosures of these publications are incorporated herein by reference.

[0041] The polarizer is preferably composed of a laminate of two or more layers, and more preferably composed of a laminate of a resin substrate and a PVA-based resin layer formed by coating on the resin substrate.

[0042] The thickness of the polarizer may be any appropriate thickness as long as the effects of the present invention are not impaired. In terms of further exhibiting 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.

[0043] The polarizer preferably exhibits absorptive dichroism at any wavelength between 380 nm and 780 nm. The polarizer has a single transmittance of, for example, 41.5% to 46.0%, preferably 43.0% to 46.0%, and more preferably 44.5% to 46.0%. The degree of polarization of the polarizer 21 is preferably 97.0% or more, more preferably 99.0% or more, and even more preferably 99.9% or more.

[0044] <1-2-b. Protective Layer> The protective layer may be formed of any suitable film that can be used as a protective layer for a polarizer. Examples of materials that constitute the main component of the film include transparent resins such as cellulose-based resins such as triacetyl cellulose (TAC), polyester-based resins, polyvinyl alcohol-based resins, polycarbonate-based resins, polyamide-based resins, polyimide-based resins, polyethersulfone-based resins, polysulfone-based resins, polystyrene-based resins, polynorbornene-based resins, polyolefin-based resins, (meth)acrylic resins, and acetate-based resins. Examples of materials that constitute the main component of the film include thermosetting or ultraviolet-curing resins such as (meth)acrylic, urethane, (meth)acrylic urethane, epoxy, and silicone-based resins. Other examples of materials that constitute the main component of the film include glassy polymers such as siloxane-based polymers, and the polymer films described in JP 2001-343529 A (WO 01 / 37007 ). Furthermore, as the material that is the main component of the film, for example, a resin composition containing a thermoplastic resin having a substituted or unsubstituted imide group in the side chain and a thermoplastic resin having a substituted or unsubstituted phenyl group and a nitrile group in the side chain can also be used. For example, a resin composition containing an alternating copolymer of isobutene and N-methylmaleimide and an acrylonitrile-styrene copolymer can be mentioned, and the film can be, for example, an extrusion molded product of such a resin composition.

[0045] One embodiment of the protective layer contains a (meth)acrylic resin. Examples of the (meth)acrylic resin include a (meth)acrylic resin having a glutarimide structure. Examples of (meth)acrylic resins having a glutarimide structure are described in, for example, JP 2006-309033 A, JP 2006-317560 A, JP 2006-328329 A, JP 2006-328334 A, JP 2006-337491 A, JP 2006-337492 A, JP 2006-337493 A, JP 2006-337569 A, JP 2007-009182 A, JP 2009-161744 A, and JP 2010-284840 A. These descriptions are incorporated herein by reference.

[0046] The thickness of the protective layer may be any appropriate thickness as long as it does not impair the effects of the present invention. In order to further exhibit 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. In addition, when the protective layer has been subjected to a surface treatment, the thickness of the protective layer includes the thickness of the layer formed by the surface treatment (surface treatment layer).

[0047] <1-3. First adhesive layer> As shown in FIGS. 1 to 3 , the first adhesive layer 21 is disposed on the viewing side of the polarizing film 10, and a first optical member 31 is bonded to the first adhesive layer 21 on the opposite side of the polarizing film 10 as viewed from the first adhesive layer 21.

[0048] The first pressure-sensitive adhesive layer may be a pressure-sensitive adhesive layer (first pressure-sensitive adhesive layer) or an adhesive layer (first adhesive layer). From the viewpoint that the pressure-sensitive adhesive layer or adhesive layer to be formed can have excellent thickness precision (low thickness variation), a pressure-sensitive adhesive layer (first pressure-sensitive adhesive layer) is preferred as the first pressure-sensitive adhesive layer.

[0049] The first pressure-sensitive adhesive layer is typically composed of a first pressure-sensitive adhesive formed from a photocurable pressure-sensitive adhesive composition (I) or a solvent-based pressure-sensitive adhesive composition (II). The photocurable pressure-sensitive adhesive composition (I) is typically a pressure-sensitive adhesive composition that forms the first pressure-sensitive adhesive by irradiation with light. The solvent-based pressure-sensitive adhesive composition (II) is typically a pressure-sensitive adhesive composition that includes a base polymer and a crosslinking agent and forms the first pressure-sensitive adhesive by curing through crosslinking.

[0050] <1-3-a. First pressure-sensitive adhesive layer obtained from photocurable pressure-sensitive adhesive composition (I)> One embodiment of the first pressure-sensitive adhesive layer is a first pressure-sensitive adhesive layer obtained from the photocurable pressure-sensitive adhesive composition (I). In this embodiment, the first pressure-sensitive adhesive layer is composed of a first pressure-sensitive adhesive formed from the photocurable pressure-sensitive adhesive composition (I).

[0051] The photocurable pressure-sensitive adhesive composition (I) contains, for example, at least one selected from the group consisting of monomer components and partial polymers of the monomer components.

[0052] The monomer component preferably contains a (meth)acrylic monomer. That is, the photocurable pressure-sensitive adhesive composition (I) preferably contains at least one selected from the group consisting of (meth)acrylic monomers and partial polymers of the (meth)acrylic monomers.

[0053] The total content of the monomer component and its partial polymer in the photocurable pressure-sensitive 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.

[0054] Examples of (meth)acrylic monomers include (meth)acrylic acid alkyl esters. The (meth)acrylic acid alkyl esters may be of only one type, or may be of two or more types. The (meth)acrylic acid alkyl ester is typically a (meth)acrylic acid alkyl ester in which the alkyl group in 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, even more preferably 1 to 8, and particularly preferably 2 to 6. The alkyl group may be linear or branched. Specific examples of (meth)acrylic acid alkyl esters include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, s-butyl (meth)acrylate, t-butyl (meth)acrylate, isobutyl (meth)acrylate, n-pentyl (meth)acrylate, isopentyl (meth)acrylate, n-hexyl (meth)acrylate, isohexyl (meth)acrylate, isoheptyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate. Examples of the (meth)acrylic acid alkyl ester include n-octyl(meth)acrylate, isooctyl(meth)acrylate, n-nonyl(meth)acrylate, isononyl(meth)acrylate, n-decyl(meth)acrylate, isodecyl(meth)acrylate, n-dodecyl(meth)acrylate (lauryl(meth)acrylate), n-tridecyl(meth)acrylate, n-tetradecyl(meth)acrylate, pentadecyl(meth)acrylate, hexadecyl(meth)acrylate, heptadecyl(meth)acrylate, and octadecyl(meth)acrylate. Among these, n-butyl(meth)acrylate is preferred as the (meth)acrylic acid alkyl ester, and n-butyl acrylate is more preferred, in terms of being able to further exhibit the effects of the present invention.

[0055] The content of the (meth)acrylic acid alkyl ester in the total amount of the monomer components (including the monomer components used to form the partial polymer) is preferably 40% by weight to 100% by weight, more preferably 50% by weight to 99.9% by weight, even more preferably 55% by weight to 99% by weight, and particularly preferably 60% by weight to 99% by weight. In one embodiment, this content may be 65% by weight to 99% by weight, 70% by weight to 99% by weight, 75% by weight to 99% by weight, 80% by weight to 99% by weight, 85% by weight to 99% by weight, 90% by weight to 99% by weight, 91% by weight to 99% by weight, 92% by weight to 98% by weight, or 93% by weight to 97% by weight. In another embodiment, the content may be 60% by weight to 95% by weight, 65% by weight to 90% by weight, 68% by weight to 88% by weight, or 70% by weight to 85% by weight.

[0056] The monomer component may contain a carboxyl group-containing monomer. The carboxyl group-containing monomer may be of only one type, or may be of two or more types. Examples of the carboxyl group-containing monomer include (meth)acrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid, and crotonic acid. Preferably, it is (meth)acrylic acid, and more preferably, it is acrylic acid. The content of the carboxyl group-containing monomer in the total amount of the monomer components (including the monomer components used to form the partial polymer) is preferably 0% by weight to 10% by weight, more preferably 0.1% by weight to 10% by weight, even more preferably 1% by weight to 9% by weight, particularly preferably 2% by weight to 8% by weight, and most preferably 3% by weight to 7% by weight.

[0057] The monomer component may contain a hydroxy group-containing monomer. The hydroxy group-containing monomer may be of only one type, or two or more types. Examples of the hydroxy group-containing monomer include hydroxy group-containing (meth)acrylates having 1 to 20 carbon atoms, such as 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-hydroxylauryl (meth)acrylate, and (4-hydroxymethylcyclohexyl)-methyl acrylate. Preferred are 2-hydroxyethyl (meth)acrylate and 4-hydroxybutyl (meth)acrylate. The content of the hydroxy group-containing monomer in the total amount of the monomer components (including the monomer components used to form the partial polymer) is preferably 0% by weight to 20% by weight. In one embodiment, the content 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, or in another embodiment, the content may be 0% to 15% by weight, 0% to 10% by weight, 0% to 7% by weight, or 0% to 5% by weight.

[0058] The monomer component may contain an ether group-containing monomer. The ether group-containing monomer may be one type only, or two or more types. Examples of the ether group-containing monomer include alkoxy group-containing monomers. Examples of the alkoxy group-containing monomer include alkylene oxide adducts represented by the following chemical formula (1). In chemical formula (1), R 1 is a hydrogen atom or a methyl group, and R 2 is an alkyl group. 2 R may be linear or branched, and is preferably linear. 2Specific examples of the group are typically a methyl group and an ethyl group. n in chemical formula (1) is an integer of 1 to 30, preferably an integer of 1 to 12, and more preferably an integer of 1 to 5.

[0059] Specific examples of the alkylene oxide adduct represented by chemical formula (1) include 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, 2-(2-ethoxyethoxy)ethyl (meth)acrylate, methoxytriethylene glycol (meth)acrylate, and methoxypolyethylene glycol (meth)acrylate, and preferably 2-methoxyethyl acrylate (MEA).

[0060] The ether group-containing monomer is not limited to the alkylene oxide adduct. The ether group-containing monomer may have a ring structure, and the ring structure may have an ether group. Examples of the ring structure having an ether group include a tetrahydrofuran ring and a dioxane ring. Specific examples of the ether group-containing monomer having a ring structure include cyclic trimethylolpropane formal (meth)acrylate and tetrahydrofurfuryl (meth)acrylate.

[0061] The content of the ether group-containing monomer in the total amount of monomer components (including monomer components used to form the partial polymer) is, for example, 0% by weight to 20% by weight. In one embodiment, this content may be 0.01% by weight to 15% by weight, 0.03% by weight to 10% by weight, 0.05% by weight to 7% by weight, or 0.05% by weight to 5% by weight. In another embodiment, this content may be 0% by weight to 15% by weight, 0% by weight to 10% by weight, 0% by weight to 7% by weight, or 0% by weight to 5% by weight.

[0062] The monomer component may contain an amide group-containing monomer. The amide group-containing monomer may be of only one type or of two or more types. The amide group-containing monomer is a compound that contains an amide group in its structure and a polymerizable unsaturated double bond such as a (meth)acryloyl group or a vinyl group. The amide group-containing monomer is preferably an amide group-containing (meth)acrylate.

[0063] Examples of the amide group-containing monomer include acrylamide-based monomers such as (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-methylol(meth)acrylamide, N-methylol-N-propane(meth)acrylamide, aminomethyl(meth)acrylamide, aminoethyl(meth)acrylamide, mercaptomethyl(meth)acrylamide, and mercaptoethyl(meth)acrylamide; N-acryloyl heterocyclic monomers such as N-(meth)acryloylmorpholine, N-(meth)acryloylpiperidine, and N-(meth)acryloylpyrrolidine; and N-vinyl group-containing lactam-based monomers such as N-vinylpyrrolidone and N-vinyl-ε-caprolactam.

[0064] The content of the amide group-containing monomer in the total amount of monomer components (including monomer components used to form the partial polymer) is, for example, 0% to 50% by weight. In one embodiment, this content may 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 content may 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.

[0065] The monomer component may contain other copolymerizable monomers. The other copolymerizable monomers may be of only one type or of two or more types. Examples of the other copolymerizable monomers include acid anhydride group-containing monomers such as maleic anhydride and itaconic anhydride; caprolactone adducts of acrylic acid; sulfonic acid group-containing monomers such as allyl sulfonic acid, 2-(meth)acrylamido-2-methylpropanesulfonic acid, (meth)acrylamidopropanesulfonic acid, and sulfopropyl (meth)acrylate; phosphoric acid group-containing monomers such as 2-hydroxyethyl acryloyl phosphate; aminoethyl (meth)acrylate, N,N-dimethylamino alkylaminoalkyl (meth)acrylates such as N-(meth)acryloyloxymethylene succinimide, N-(meth)acryloyl-6-oxyhexamethylene succinimide, and N-(meth)acryloyl-8-oxyoctamethylene succinimide; N-cyclohexylmaleimide, N-isopropylmaleimide, N-laurylmaleimide, and N-phenylmaleimide. maleimide-based monomers; itaconimide-based monomers such as N-methylitaconimide, N-ethylitaconimide, N-butylitaconimide, N-octylitaconimide, N-2-ethylhexylitaconimide, N-cyclohexylitaconimide, and N-laurylitaconimide; vinyl-based monomers such as vinyl acetate and vinyl propionate; cyanoacrylate-based monomers such as acrylonitrile and methacrylonitrile; epoxy group-containing (meth)acrylates such as glycidyl (meth)acrylate; glycol-based (meth)acrylates such as carbitol (meth)acrylate, ethyl carbitol (meth)acrylate, polyethylene glycol (meth)acrylate, polypropylene glycol (meth)acrylate, methoxyethylene glycol (meth)acrylate, and methoxypolypropylene glycol (meth)acrylate; (meth)acrylates such as tetrahydrofurfuryl (meth)acrylate, fluorine (meth)acrylate, and silicone (meth)acrylate;Examples of such silane monomers include silane monomers containing silicon atoms, such as 3-acryloxypropyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, 4-vinylbutyltrimethoxysilane, 4-vinylbutyltriethoxysilane, 8-vinyloctyltrimethoxysilane, 8-vinyloctyltriethoxysilane, 10-methacryloyloxydecyltrimethoxysilane, 10-acryloyloxydecyltrimethoxysilane, 10-methacryloyloxydecyltriethoxysilane, and 10-acryloyloxydecyltriethoxysilane.

[0066] The content of the other copolymerizable monomer in the total amount of the monomer components (including the monomer components used to form the partial polymer) is, for example, 0% by weight to 10% by weight, or may be 0% by weight to 5% by weight, or may be 0% by weight to 3% by weight.

[0067] The photocurable pressure-sensitive adhesive composition (I) may contain a partial polymer of each of the above-mentioned monomers. The partial polymer may be either a homopolymer or a copolymer. The partial polymer can appropriately increase the viscosity of the photocurable pressure-sensitive adhesive composition (I), thereby contributing to the stable formation of a coating layer, which will be described later.

[0068] The photocurable pressure-sensitive adhesive composition (I) may contain a photopolymerization initiator. Any appropriate photopolymerization initiator may be used as the photopolymerization initiator as long as the effects of the present invention are not impaired. Examples of the photopolymerization initiator include photoradical generators that generate radicals when exposed to visible light and / or ultraviolet light having a wavelength shorter than 450 nm. The photopolymerization initiator may be one type only, or two or more types.

[0069] Examples of the photopolymerization initiator include α-ketol compounds such as 4-(2-hydroxyethoxy)phenyl(2-hydroxy-2-propyl)ketone, α-hydroxy-α,α'-dimethylacetophenone, 2-methyl-2-hydroxypropiophenone, 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 anisoin methyl ether; and ketal compounds such as benzyl dimethyl ketal. aromatic sulfonyl chloride compounds such as 2-naphthalenesulfonyl chloride; photoactive oxime compounds such as 1-phenone-1,1-propanedione-2-(o-ethoxycarbonyl)oxime; benzophenone compounds such as benzophenone, benzoylbenzoic acid, and 3,3'-dimethyl-4-methoxybenzophenone; thioxanthone compounds such as thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-dichlorothioxanthone, 2,4-diethylthioxanthone, and 2,4-diisopropylthioxanthone; camphorquinone; halogenated ketones; acylphosphinoxides; and acylphosphonates.

[0070] The photopolymerization initiator may be a photopolymerization initiator having two or more (preferably 2 to 5) photodegradable groups. The photodegradable group refers to a functional group that absorbs irradiated active energy rays and generates radicals, and specific examples thereof include a ketone group, a halogenated alkyl group, an ester group, a sulfone group, and a peroxy group.

[0071] Examples of the photopolymerization initiator having two or more photodegradable groups include 2-hydroxy-1-[4-[4-(2-hydroxy-2-methyl-propionyl)-benzyl]phenyl]-2-methylpropan-1-one (commercially available products include, for example, the trade name "Omnirad 127D" manufactured by IGM Resins B.V.), 1-[4-(4-benzoxylphenylsulfanyl)phenyl]-2-methyl-2-(4-methylphenylsulfonyl)propan-1-one (commercially available products include, for example, the trade name "ESACURE 1001M" manufactured by IGM Resins B.V.), methyl benzoyl formate (commercially available products include, for example, the trade name "SPEEDCURE MBF" manufactured by ARKEMA), and methyl benzoyl formate (commercially available products include, for example, the trade name "SPEEDCURE MBF" manufactured by ARKEMA). Examples of commercially available products include O-ethoxyimino-1-phenylpropan-1-one (for example, a commercially available product under the trade name "SPEEDCURE PDO" manufactured by ARKEMA Sartomer), and oligo[2-hydroxy-2-methyl-4-(1-methylvinyl)phenyl]propanone (for example, a commercially available product under the trade name "ESACURE KIP150" manufactured by IGM Resins B.V.).

[0072] As the photopolymerization initiator, a compound containing a phosphorus atom and / or a nitrogen atom may be used. Examples of such photopolymerization initiators include 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropan-1-one (commercially available products include, for example, the trade name "Omnirad 907" manufactured by IGM Resins B.V.), 2-benzyl-2-(dimethylamino)-4'-morpholinobutyrophenone (commercially available products include, for example, the trade name "Omnirad 369" manufactured by IGM Resins B.V.), and 2-dimethylamino-2-(4-methylbenzyl)-1-(4-morpholin-4-yl-phenyl)butan-1-one (commercially available products include, for example, the trade name "Omnirad 379" manufactured by IGM Resins B.V.). B.V.), bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide (a commercially available product is, for example, the trade name "Omnirad 819" manufactured by IGM Resins B.V.), 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (a commercially available product is, for example, the trade name "Omnirad TPO" manufactured by IGM Resins B.V.), 1,2-octanedione-1-[4-(phenylthio)phenyl-2-(O-benzoyloxime)] (a commercially available product is, for example, the trade name "Omnirad OXE01" manufactured by IGM Resins B.V.), B.V.), ethanone-1-[9-ethyl-6-(2-methylbenzoyl)-9H-carbazol-3-yl]-1-(O-acetyloxime) (a commercially available product is, for example, the trade name "OmniradOXE02", manufactured by IGM Resins B.V.).

[0073] The content of the photopolymerization initiator in the photocurable pressure-sensitive adhesive composition (I) may be any appropriate content within a range that does not impair the effects of the present invention. The content of such a photopolymerization initiator is, for example, 0.02 to 10 parts by weight, preferably 0.05 to 5 parts by weight, relative to 100 parts by weight of the total amount of the monomer components (including the monomer components used to form the partial polymer).

[0074] The photocurable pressure-sensitive adhesive composition (I) may contain a crosslinking agent. The crosslinking agent may be one kind or two or more kinds.

[0075] Examples of crosslinking agents include polyfunctional (meth)acrylates (such as ester compounds of polyhydric alcohols and (meth)acrylic acid), allyl (meth)acrylate, vinyl (meth)acrylate, divinylbenzene, epoxy (meth)acrylate, polyester (meth)acrylate, urethane (meth)acrylate, butyl di(meth)acrylate, and hexyl di(meth)acrylate.

[0076] Examples of the polyfunctional (meth)acrylate include difunctional (meth)acrylate, trifunctional (meth)acrylate, and polyfunctional (meth)acrylate having tetrafunctional or more.

[0077] Examples of bifunctional (meth)acrylates include (poly)ethylene glycol di(meth)acrylates such as ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, and tetraethylene glycol di(meth)acrylate; (poly)propylene glycol di(meth)acrylates such as propylene glycol di(meth)acrylate, dipropylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, and tetrapropylene glycol di(meth)acrylate; 1,6-hexanediol di(meth)acrylate; 1,9-nonanediol diacrylate (NDDA); 1,12-dodecanediol di(meth)acrylate; glycerin di(meth)acrylate; stearic acid-modified pentaerythritol di(meth)acrylate; dicyclopentadienyl di(meth)acrylate; di(meth)acryloyl isocyanurate; and ethoxylated bisphenol A di(meth)acrylate.

[0078] Examples of trifunctional (meth)acrylates include pentaerythritol tri(meth)acrylate, trimethylolpropane tri(meth)acrylate, tetramethylolmethane tri(meth)acrylate, and tris((meth)acryloyloxyethyl)isocyanurate.

[0079] Examples of tetrafunctional or higher polyfunctional (meth)acrylates 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.

[0080] One preferred embodiment of the polyfunctional (meth)acrylate is 1,9-nonanediol di(meth)acrylate (for example, 1,9-nonanediol diacrylate (NDDA)) or di(trimethylolpropane)tetra(meth)acrylate. As the di(trimethylolpropane)tetra(meth)acrylate, for example, a commercially available product under the trade name "PHOTOMER 4306" (manufactured by IGM Resins B.V.) can be used.

[0081] As the epoxy (meth)acrylate, a commercially available product such as "EBECRYL3700" (manufactured by Daicel Allnex Co., Ltd.) can be used.

[0082] As the polyester (meth)acrylate, a commercially available product such as "PHOTOMER 5429" (manufactured by IGM Resins B.V.) can be used.

[0083] As the urethane (meth)acrylate, a commercially available product such as "EBECRYL4859" (manufactured by Daicel Allnex Co., Ltd.) can be used.

[0084] A polyfunctional oligomer may be used as the crosslinking agent. Only one type of polyfunctional oligomer may be used, or two or more types may be used. Examples of polyfunctional oligomers include urethane (meth)acrylate oligomers (oligomers having a urethane skeleton and two or more (meth)acryloyl groups), epoxy (meth)acrylate oligomers (oligomers having an epoxy skeleton and two or more (meth)acryloyl groups), and silicone (meth)acrylate oligomers (oligomers having a siloxane skeleton and two or more (meth)acryloyl groups). A preferred example of the polyfunctional oligomer is a urethane (meth)acrylate oligomer. Commercially available urethane (meth)acrylate oligomers include products manufactured by Negami Chemical Industrial 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."

[0085] The weight average molecular weight (Mw) of the polyfunctional oligomer is, for example, 1,000 to 50,000, or may be 5,000 to 40,000, 8,000 to 30,000, 11,000 to 25,000, 14,000 to 23,000, or 16,000 to 22,000. Such a configuration is preferable from the viewpoint of appropriately adjusting the viscoelasticity (e.g., shear storage modulus and loss tangent) of the base polymer. The weight average molecular weight (Mw) in this specification is a value (polystyrene equivalent) based on measurement by GPC (gel permeation chromatography).

[0086] In terms of being able to further exhibit the effects of the present invention, it is preferable to select at least one crosslinking agent selected from the group consisting of polyfunctional (meth)acrylates, epoxy (meth)acrylates, polyester (meth)acrylates, urethane (meth)acrylates, and polyfunctional oligomers.

[0087] As the crosslinking agent, an isocyanate-based crosslinking agent may be used in combination with the above crosslinking agent. Such an isocyanate-based crosslinking agent may be used alone or in combination of two or more types. The content of the isocyanate-based crosslinking agent in the total amount of crosslinking agents is preferably 0% by weight to 50% by weight, more preferably 0% by weight to 30% by weight, even more preferably 0% by weight to 10% by weight, particularly preferably 0% by weight to 5% by weight, and most preferably 0% by weight to 1% by weight.

[0088] As the isocyanate-based crosslinking agent, any suitable conventionally known isocyanate-based crosslinking agent can be used. As the isocyanate-based 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. The upper limit of the number of isocyanate groups is not particularly limited, and is, for example, 5. Examples of the isocyanate compound include aromatic isocyanate compounds, alicyclic isocyanate compounds, and aliphatic isocyanate compounds.

[0089] Examples of aromatic isocyanate compounds include phenylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene 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 xylylene diisocyanate.

[0090] Examples of alicyclic isocyanate compounds include 1,3-cyclopentene diisocyanate, 1,3-cyclohexane diisocyanate, 1,4-cyclohexane diisocyanate, isophorone diisocyanate, hydrogenated diphenylmethane diisocyanate, hydrogenated xylylene diisocyanate, hydrogenated tolylene diisocyanate, and hydrogenated tetramethylxylylene diisocyanate.

[0091] Examples of the aliphatic isocyanate compound include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate (HDI), pentamethylene diisocyanate (PDI), 1,2-propylene diisocyanate, 1,3-butylene diisocyanate, dodecamethylene diisocyanate, and 2,4,4-trimethylhexamethylene diisocyanate.

[0092] Examples of the isocyanate-based crosslinking agent include polymers (dimers, trimers, pentamers, etc.) of the above-mentioned isocyanate compounds, adducts obtained by adding them to polyhydric alcohols such as trimethylolpropane, urea-modified products, biuret-modified products, allophanate-modified products, isocyanurate-modified products, carbodiimide-modified products, and urethane prepolymers obtained by adding them to polyether polyols, polyester polyols, acrylic polyols, polybutadiene polyols, polyisoprene polyols, and the like.

[0093] The isocyanate-based crosslinking agent may contain at least one derivative selected from an alicyclic isocyanate compound and an aliphatic isocyanate compound. It is particularly preferable that the isocyanate-based crosslinking agent be at least one selected from the group consisting of pentamethylene diisocyanate (PDI)-based crosslinking agents (PDI and its derivatives) and hexamethylene diisocyanate (HDI)-based crosslinking agents (HDI and its derivatives). Specific examples of PDI-based crosslinking agents include isocyanurate-modified PDI. Specific examples of HDI-based crosslinking agents include isocyanurate-modified HDI and biuret-modified HDI.

[0094] The content of the crosslinking agent in the photocurable pressure-sensitive adhesive composition (I) may be appropriately determined depending on the molecular weight, the number of functional groups, and the like. To further enhance the effects of the present invention, the content of the crosslinking agent relative to 100 parts by weight of the total amount of monomer components (including the monomer components used to form the partial polymer) is preferably 0.01 to 20 parts by weight. In one embodiment, this content may 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 may 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.

[0095] When a polyfunctional (meth)acrylate is used as a crosslinking agent, the content of the polyfunctional (meth)acrylate relative to 100 parts by weight of the total amount of monomer components (including monomer components used to form a partial polymer) in the photocurable pressure-sensitive adhesive composition (I) is preferably 0.01 to 20 parts by weight, in order to further enhance the effects of the present invention. In one embodiment, this content ratio may 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 may 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.

[0096] When at least one selected from the group consisting of epoxy (meth)acrylate, polyester (meth)acrylate, and urethane (meth)acrylate is used as the crosslinking agent, the content of the crosslinking agent relative to 100 parts by weight of the total amount of monomer components (including monomer components used to form a partial polymer) in the photocurable pressure-sensitive adhesive composition (I) is preferably 0.01 to 20 parts by weight, more preferably 0.1 to 10 parts by weight, even more preferably 0.2 to 5 parts by weight, still more preferably 0.3 to 3 parts by weight, particularly preferably 0.3 to 2 parts by weight, and most preferably 0.4 to 1.5 parts by weight, in order to further exhibit the effects of the present invention.

[0097] When a polyfunctional oligomer is used as the crosslinking agent, the content of the polyfunctional oligomer relative to 100 parts by weight of the total amount of the monomer components (including the monomer components used to form the partial polymer) in the photocurable pressure-sensitive adhesive composition (I) is preferably 0.01 to 20 parts by weight, may be 0.1 to 15 parts by weight, may be 0.5 to 10 parts by weight, or may be 1 to 5 parts by weight, in order to further exhibit the effects of the present invention.

[0098] The photocurable pressure-sensitive adhesive composition (I) may contain any appropriate other additives as long as the effects of the present invention are not impaired. The other additives may be one kind or two or more kinds. Examples of such other additives include chain transfer agents, silane coupling agents, viscosity modifiers, tackifiers, plasticizers, softeners, antioxidants, fillers, colorants, rust inhibitors, antioxidants, antistatic agents, UV absorbers, and solvents.

[0099] In one embodiment of the photocurable pressure-sensitive adhesive composition (I), the content of the ultraviolet absorber relative to 100 parts by weight of the total amount of the monomer components (including the monomer components used to form the partial polymer) in the photocurable pressure-sensitive adhesive composition (I) is preferably 0 to 5 parts by weight, may be 0 to 3 parts by weight, may be 0 to 2 parts by weight, may be 0 to 1 part by weight, or may be substantially 0 part by weight.

[0100] The photocurable pressure-sensitive adhesive composition (I) may contain a solvent. The content of the solvent in the photocurable pressure-sensitive adhesive composition (I) is preferably 5 wt % or less.

[0101] The viscosity of the photocurable pressure-sensitive adhesive composition (I) is, for example, 5 to 150 poise.

[0102] The first pressure-sensitive adhesive layer can be formed from the photocurable pressure-sensitive adhesive composition (I) by any appropriate method as long as the effects of the present invention are not impaired.

[0103] [1-3-a(1). One embodiment of a method for forming a first pressure-sensitive adhesive layer from a photocurable pressure-sensitive adhesive composition (I)] One embodiment of a method for forming a first pressure-sensitive adhesive layer from a photocurable pressure-sensitive adhesive composition (I) involves, for example, preparing a laminate comprising, in this order, a base sheet, a coating layer comprising the photocurable pressure-sensitive adhesive composition (I), and a release liner, and then irradiating the resulting laminate with light to cure the coating layer and form a first pressure-sensitive adhesive layer. This results in a laminate comprising, in this order, the base sheet / first pressure-sensitive adhesive layer / release liner.

[0104] The laminate comprising a substrate sheet, a coating layer containing the photocurable pressure-sensitive adhesive composition (I), and a release liner in this order can be produced by any appropriate method as long as the effects of the present invention are not impaired. For example, such a production method includes coating the photocurable pressure-sensitive adhesive composition (I) on a release liner and laminating a substrate sheet on the coated surface.

[0105] The substrate sheet may be in the form of a sheet or a continuous sheet. Examples of the substrate sheet include a resin film. 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. The resin constituting the resin film is preferably a polyester such as polyethylene terephthalate.

[0106] The thickness of the substrate sheet may be any appropriate thickness as long as it does not impair the effects of the present invention, for example, 10 μm to 200 μm, and preferably 25 μm to 150 μm.

[0107] The substrate sheet may have a release layer on the surface on the coating layer side. Any appropriate release layer may be used as the release layer as long as the effects of the present invention are not impaired. For example, a commonly known release layer may be used as such a release layer. Such a release layer is typically a cured layer of a release agent composition containing a release agent. Various release agents can be used as the release agent, such as silicone-based release agents, fluorine-based release agents, long-chain alkyl-based release agents, fatty acid amide-based release agents, and silica powder. Any appropriate thickness may be used as the release layer as long as the effects of the present invention are not impaired. Such a thickness is, for example, 10 nm to 300 nm.

[0108] The substrate of the release liner (hereinafter referred to as "liner substrate") can be, for example, a resin film. Examples of resins that make up 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. The resin that makes up the resin film is preferably polyesters such as polyethylene terephthalate. The thickness of the release liner is, for example, 10 μm to 200 μm.

[0109] The release liner may include a layer other than the liner substrate. The release liner may include a release layer. For example, the release liner may include a liner substrate and a release layer formed on one surface of the liner substrate. The release layer of the release liner may be on the coating layer side.

[0110] The coating layer can be formed by any appropriate method as long as the effects of the present invention are not impaired. For example, the coating layer is formed by coating a photocurable pressure-sensitive adhesive composition (I) on the surface of a release liner (preferably on the release layer side, if a release layer is provided). Examples of coating methods that can be used include roll coating, kiss roll coating, gravure coating, reverse coating, roll brushing, spray coating, dip roll coating, bar coating, knife coating, air knife coating, curtain coating, lip coating, and die coating. After coating, heating and drying may be performed as necessary.

[0111] The thickness of the coating layer may be adjusted depending on the thickness of the first pressure-sensitive adhesive layer to be finally obtained.

[0112] The light to be irradiated may be any appropriate light under any appropriate conditions as long as the effects of the present invention are not impaired. The light to be irradiated is, for example, visible light or ultraviolet light having a wavelength shorter than 450 nm. The light source to be irradiated may 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 light lamps, chemical lamps, germicidal lamps, low-pressure discharge mercury lamps, and excimer lasers, and two or more ultraviolet irradiation lamps may be combined. The illuminance of the light to be irradiated is, for example, 1 mW / cm 2 ~20mW / cm 2 The irradiation time of the light is, for example, 5 minutes to 5 hours. The integrated light amount of the light is, for example, 100 mJ / cm 2 ~5000mJ / cm 2 is.

[0113] [1-3-a(2). Another embodiment of the method for forming a first pressure-sensitive adhesive layer from a photocurable pressure-sensitive adhesive composition (I)] Another embodiment of the method for forming a first pressure-sensitive adhesive layer from a photocurable pressure-sensitive adhesive composition (I) involves, for example, preparing a laminate comprising, in this order, a substrate sheet, a coating layer comprising the photocurable pressure-sensitive adhesive composition (I), and a release liner, irradiating the resulting laminate with light to cure the coating layer, peeling off the release liner, applying an additive solution to the exposed surface of the cured product layer, optionally drying, and then laminating a release liner to the side coated with the additive solution, and irradiating the resulting laminate with light to form a first pressure-sensitive adhesive layer. This produces a laminate comprising, in this order, substrate sheet / first pressure-sensitive adhesive layer / release liner.

[0114] In this embodiment, instead of applying an additive solution to the surface of the exposed cured layer and drying it as necessary, and then laminating a release liner to the side coated with the additive solution and irradiating it with light to cure it, a first optical member may be first laminated to the side coated with the additive solution and irradiating it with light through the first optical member to form a first pressure-sensitive adhesive layer, thereby obtaining a laminate comprising a base sheet / first pressure-sensitive adhesive layer / first optical member in this order.

[0115] As the light to be irradiated for curing, any appropriate light can be adopted as long as it does not impair the effects of the present invention.

[0116] Any suitable additive may be used as the additive as long as it does not impair the effects of the present invention. Examples of such additives include at least one selected from the group consisting of a photopolymerization initiator, a crosslinking agent, a monomer component, an ultraviolet absorber, a rust inhibitor, and an antistatic agent. The additive may be one type or two or more types. The additives referred to here do not include solvents. As described below, the additives can be used as a solution by mixing with a solvent.

[0117] One preferred embodiment of the additive is at least one selected from the group consisting of a photopolymerization initiator, a crosslinking agent, and a monomer component.

[0118] As the photopolymerization initiator that can be used as the additive, any appropriate photopolymerization initiator can be used as long as it does not impair the effects of the present invention. As such a photopolymerization initiator, those described above can be used. The photopolymerization initiator may be one type or two or more types.

[0119] The amount of the photopolymerization initiator that can be used as the additive may be any appropriate amount as long as the effects of the present invention are not impaired. The amount of such a photopolymerization initiator is, for example, 0 to 15 parts by weight, or may be 0.01 to 10 parts by weight, or may be 0.1 to 5 parts by weight, relative to 100 parts by weight of the solid content of the photocurable pressure-sensitive adhesive composition (I).

[0120] One embodiment of the amount of the photopolymerization initiator that can be used as the additive is, for example, 0 to 10 parts by weight, may be 0.01 to 10 parts by weight, may be 0.05 to 5 parts by weight, may be 0.1 to 3 parts by weight, or may be 0.3 to 1 part by weight, relative to 100 parts by weight of the total amount of the monomer components in the photocurable pressure-sensitive adhesive composition (I) (including the monomer components used to form the partial polymer).

[0121] As the crosslinking agent that can be used as the additive, any appropriate crosslinking agent can be used as long as it does not impair the effects of the present invention. As such a crosslinking agent, those described above can be used. The crosslinking agent may be one type or two or more types.

[0122] The amount of the crosslinking agent that can be used as the additive may be any appropriate amount as long as the effects of the present invention are not impaired. The amount of such a crosslinking agent is, for example, 0 to 40 parts by weight, 1 to 35 parts by weight, or 5 to 30 parts by weight, relative to 100 parts by weight of the solid content of the photocurable pressure-sensitive adhesive composition (I).

[0123] One embodiment of the amount of the crosslinking agent that can be used as the additive is, for example, 0 to 100 parts by weight, may be 0.1 to 100 parts by weight, may be 1 to 70 parts by weight, may be 5 to 50 parts by weight, may be 10 to 40 parts by weight, or may be 15 to 35 parts by weight, relative to 100 parts by weight of the total amount of the monomer components in the photocurable pressure-sensitive adhesive composition (I) (including the monomer components used to form the partial polymer).

[0124] As the monomer component that can be used as the additive, any appropriate monomer component can be adopted as long as it does not impair the effects of the present invention. The above-described description of the monomer component in the photocurable pressure-sensitive adhesive composition (I) can be used for such a monomer component. The monomer component may be one type or two or more types.

[0125] One embodiment of the amount of the monomer component that can be used as the additive is, for example, 0 to 100 parts by weight, optionally 0.1 to 100 parts by weight, optionally 0.5 to 70 parts by weight, optionally 1 to 50 parts by weight, optionally 1.5 to 40 parts by weight, optionally 2 to 35 parts by weight, optionally 3 to 30 parts by weight, optionally 4 to 25 parts by weight, or optionally 5 to 20 parts by weight, relative to 100 parts by weight of the total amount of the monomer components in the photocurable pressure-sensitive adhesive composition (I) (including the monomer components used to form the partial polymer).

[0126] An ultraviolet absorber may be used as the additive. However, in order to further exhibit the effects of the present invention, an ultraviolet absorber may not be used. As such an ultraviolet absorber, any appropriate ultraviolet absorber may be used as long as it does not impair the effects of the present invention. Examples of such ultraviolet absorbers include triazine-based ultraviolet absorbers, benzotriazole-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers, oxybenzophenone-based ultraviolet absorbers, salicylic acid ester-based ultraviolet absorbers, and cyanoacrylate-based ultraviolet absorbers.

[0127] The amount of the ultraviolet absorber that can be used as the additive is preferably 0 to 5% by weight, may be 0 to 3% by weight, may be 0 to 2% by weight, may be 0 to 1% by weight, or may be substantially 0% by weight, relative to 100 parts by weight of the total amount of the monomer components in the photocurable pressure-sensitive adhesive composition (I) (including the monomer components used to form the partial polymer).

[0128] The total amount of the additives added relative to 100 parts by weight of the total amount of the photocurable pressure-sensitive adhesive composition (I) (typically, the total amount of the monomer components, crosslinking agent, photopolymerization initiator, and, if necessary, other components) is, for example, 1 part by weight to 100 parts by weight, or alternatively, 3 parts by weight to 70 parts by weight, 5 parts by weight to 50 parts by weight, 7 parts by weight to 40 parts by weight, or 10 parts by weight to 30 parts by weight.

[0129] As described above, the additives can be used in the form of an additive solution. The solvent that can be used to prepare the additive solution may be one type only, or two or more types. 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; ethers such as diethyl ether, dimethoxyethane, tetrahydrofuran, and dioxane; amides such as N,N-dimethylformamide and N,N-dimethylacetamide; nitriles such as acetonitrile, propionitrile, and benzonitrile; and alcohols such as methanol, ethanol, propanol, isopropanol, n-butanol, isobutanol, sec-butanol, and tert-butanol.

[0130] The amount of the solvent may be any appropriate amount within a range that does not impair the effects of the present invention.

[0131] Details of another embodiment of the method for forming the first pressure-sensitive adhesive layer from the photocurable pressure-sensitive adhesive composition (I) as described above are described, for example, in JP 2021-155733 A. The entire disclosure of this publication is incorporated herein by reference.

[0132] <1-3-b. First PSA layer obtained from solvent-based PSA composition (II)> Another embodiment of the first PSA layer is a first PSA layer obtained from a solvent-based PSA composition (II). In this embodiment, the first PSA layer is composed of a first PSA formed from the solvent-based PSA composition (II).

[0133] The solvent-based pressure-sensitive adhesive composition (II) typically contains a base polymer and a crosslinking agent. When the first pressure-sensitive adhesive layer is obtained from the solvent-based pressure-sensitive adhesive composition (II), examples of the pressure-sensitive adhesive constituting the first pressure-sensitive adhesive layer include acrylic pressure-sensitive adhesives, polyester pressure-sensitive adhesives, rubber pressure-sensitive adhesives, vinyl alkyl ether pressure-sensitive adhesives, silicone pressure-sensitive adhesives, polyamide pressure-sensitive adhesives, urethane pressure-sensitive adhesives, fluorine-based pressure-sensitive adhesives, epoxy pressure-sensitive adhesives, and polyether pressure-sensitive adhesives.

[0134] Below, as a typical example, a case where the adhesive constituting the first adhesive layer is an acrylic adhesive will be described, but the adhesive constituting the first adhesive layer is not limited to this.

[0135] The acrylic pressure-sensitive adhesive composition preferably contains an acrylic polymer and a crosslinking agent, in that the effects of the present invention can be more effectively exhibited.

[0136] The acrylic polymer may be referred to as a base polymer in the field of acrylic pressure-sensitive adhesives. The acrylic polymer may be one type only, or two or more types may be used.

[0137] The content of the acrylic polymer in the acrylic pressure-sensitive adhesive composition is preferably 50 wt % to 99.9 wt %, more preferably 60 wt % to 99.5 wt %, even more preferably 70 wt % to 99 wt %, particularly preferably 80 wt % to 99 wt %, and most preferably 90 wt % to 99 wt %, calculated as solid content.

[0138] As the acrylic polymer, any appropriate acrylic polymer can be used as long as it does not impair the effects of the present invention.

[0139] 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) herein is a value (polystyrene equivalent) based on measurement by GPC (gel permeation chromatography).

[0140] The Tg (glass transition temperature) of the acrylic polymer is preferably -100°C to 30°C, more preferably -95°C to 20°C, even more preferably -90°C to 10°C, and particularly preferably -80°C to 0°C.

[0141] Acrylic polymers can typically be obtained by polymerization of a monomer composition containing a (meth)acrylic acid alkyl ester. That is, acrylic polymers can typically have structural units derived from a (meth)acrylic acid alkyl ester. The (meth)acrylic acid alkyl ester may be of only one type, or of two or more types. The (meth)acrylic acid alkyl ester is typically a (meth)acrylic acid alkyl ester in which the alkyl group in 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, even more preferably 1 to 8, and particularly preferably 2 to 6. The alkyl group may be linear or branched.

[0142] Examples of (meth)acrylic acid alkyl esters include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, s-butyl (meth)acrylate, t-butyl (meth)acrylate, isobutyl (meth)acrylate, n-pentyl (meth)acrylate, isopentyl (meth)acrylate, n-hexyl (meth)acrylate, isohexyl (meth)acrylate, isoheptyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate. Acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, n-nonyl (meth)acrylate, isononyl (meth)acrylate, n-decyl (meth)acrylate, isodecyl (meth)acrylate, n-dodecyl (meth)acrylate (lauryl (meth)acrylate), n-tridecyl (meth)acrylate, n-tetradecyl (meth)acrylate, pentadecyl (meth)acrylate, hexadecyl (meth)acrylate, heptadecyl (meth)acrylate, and octadecyl (meth)acrylate.

[0143] The content of structural units derived from (meth)acrylic acid alkyl esters in all structural units constituting the acrylic polymer is preferably 50% by weight or more, more preferably 60% by weight to 100% by weight, even more preferably 70% by weight to 100% by weight, and particularly preferably 80% by weight to 100% by weight. The content of (meth)acrylic acid alkyl esters in the monomer composition is preferably 50% by weight or more, more preferably 60% by weight to 100% by weight, even more preferably 70% by weight to 100% by weight, and particularly preferably 80% by weight to 100% by weight.

[0144] The acrylic polymer may have a structural unit other than the structural unit derived from the (meth)acrylic acid alkyl ester. Such a structural unit is a structural unit derived from another monomer copolymerizable with the (meth)acrylic acid alkyl ester.

[0145] Examples of the other monomer include aromatic ring-containing monomers, hydroxyl group-containing monomers, carboxyl group-containing monomers, amino group-containing monomers, amide group-containing monomers, polyfunctional monomers, and other copolymerizable monomers. The other monomers may be of only one type or of two or more types.

[0146] Examples of aromatic ring-containing monomers include phenyl(meth)acrylate, phenoxyethyl(meth)acrylate, benzyl(meth)acrylate, phenoxydiethylene glycol(meth)acrylate, ethylene oxide-modified nonylphenol(meth)acrylate, hydroxyethylated β-naphthol(meth)acrylate, and biphenyl(meth)acrylate.

[0147] The content of the aromatic ring-containing monomer in all the constituent units constituting the acrylic polymer is preferably 0 to 50% by weight, more preferably 1 to 30% by weight, even more preferably 5 to 25% by weight, particularly preferably 8 to 20% by weight, and most preferably 10 to 18% by weight. The content of the aromatic ring-containing monomer in the monomer composition is preferably 0 to 50% by weight, more preferably 1 to 30% by weight, even more preferably 5 to 25% by weight, particularly preferably 8 to 20% by weight, and most preferably 10 to 18% by weight.

[0148] Examples of the hydroxyl group-containing monomer include hydroxyalkyl (meth)acrylates such as 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, and 12-hydroxylauryl (meth)acrylate; and (4-hydroxymethylcyclohexyl)-methyl acrylate.

[0149] The content of the hydroxyl group-containing monomer in all the constituent units constituting the acrylic polymer is preferably 0 to 20% by weight, more preferably 0 to 10% by weight, even more preferably 0 to 5% by weight, particularly preferably 0 to 3% by weight, and most preferably 0 to 1% by weight. The content of the hydroxyl group-containing monomer in the monomer composition is preferably 0 to 20% by weight, more preferably 0 to 10% by weight, even more preferably 0 to 5% by weight, particularly preferably 0 to 3% by weight, and most preferably 0 to 1% by weight.

[0150] Examples of the carboxyl group-containing monomer include (meth)acrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid, and crotonic acid.

[0151] Examples of the amino group-containing monomer include N,N-dimethylaminoethyl (meth)acrylate and N,N-dimethylaminopropyl (meth)acrylate.

[0152] Examples of the amide group-containing monomer include acrylamide-based monomers such as (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-methylol(meth)acrylamide, N-methylol-N-propane(meth)acrylamide, aminomethyl(meth)acrylamide, aminoethyl(meth)acrylamide, mercaptomethyl(meth)acrylamide, and mercaptoethyl(meth)acrylamide; N-acryloyl heterocyclic monomers such as N-(meth)acryloylmorpholine, N-(meth)acryloylpiperidine, and N-(meth)acryloylpyrrolidine; N-vinylpyrrolidone; and N-vinyl group-containing lactam-based monomers such as N-vinyl-ε-caprolactam.

[0153] Examples of polyfunctional monomers include polyfunctional acrylates such as hexanediol di(meth)acrylate (1,6-hexanediol di(meth)acrylate), butanediol di(meth)acrylate, (poly)ethylene glycol di(meth)acrylate, (poly)propylene 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 (meth)acrylate, vinyl (meth)acrylate, epoxy acrylate, polyester acrylate, and urethane acrylate; and divinylbenzene.

[0154] The total content of the carboxyl group-containing monomer-derived structural units, the amino group-containing monomer-derived structural units, the amide group-containing monomer-derived structural units, and the polyfunctional monomer-derived structural units in the total structural units constituting the acrylic polymer is preferably 0% to 20% by weight, more preferably 0% to 10% by weight, even more 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 carboxyl group-containing monomer, the amino group-containing monomer, the amide group-containing monomer, and the polyfunctional monomer in the monomer composition is preferably 0% to 20% by weight, more preferably 0% to 10% by weight, even more preferably 0% to 8% by weight, particularly preferably 0% to 5% by weight, and most preferably 0% to 3% by weight.

[0155] Examples of other copolymerizable monomers include (meth)acrylic acid alkoxyalkyl esters such as 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate, methoxytriethylene glycol (meth)acrylate, 3-methoxypropyl (meth)acrylate, 3-ethoxypropyl (meth)acrylate, 4-methoxybutyl (meth)acrylate, and 4-ethoxybutyl (meth)acrylate; epoxy group-containing monomers such as glycidyl (meth)acrylate and methyl glycidyl (meth)acrylate; sulfonic acid group-containing monomers such as sodium vinyl sulfonate; phosphoric acid group-containing monomers; (meth)acrylic acid esters having an alicyclic hydrocarbon group such as cyclopentyl (meth)acrylate, cyclohexyl (meth)acrylate, and isobornyl (meth)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.

[0156] The content of the structural units derived from other copolymerizable monomers in all structural units constituting the acrylic polymer is preferably 0% by weight to 20% by weight, more preferably 0% by weight to 10% by weight, even more preferably 0% by weight to 5% by weight, particularly preferably 0% by weight to 3% by weight, and most preferably 0% by weight to 1% by weight. The content of the other copolymerizable monomers in the monomer composition is preferably 0% by weight to 20% by weight, more preferably 0% by weight to 10% by weight, even more preferably 0% by weight to 5% by weight, particularly preferably 0% by weight to 3% by weight, and most preferably 0% by weight to 1% by weight.

[0157] The acrylic polymer can be obtained by polymerizing the monomer components. Examples of the polymerization include solution polymerization, emulsion polymerization, bulk polymerization, thermal polymerization, and active energy ray polymerization, with solution polymerization and active energy ray polymerization being preferred.

[0158] Examples of solvents used in solution polymerization include 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. Only one type of solvent may be used, or two or more types may be used.

[0159] A polymerization initiator may be used in the polymerization of the monomer components. The type of polymerization initiator can be appropriately selected depending on the polymerization reaction, and may be, for example, a thermal polymerization initiator or a photopolymerization initiator.

[0160] Examples of polymerization initiators used in solution polymerization include azo polymerization initiators, peroxide polymerization initiators, and redox polymerization initiators. Examples of peroxide polymerization initiators include dibenzoyl peroxide and t-butyl permaleate. Among these, the azo polymerization initiators disclosed in JP 2002-69411 A are preferred. Examples of azo polymerization initiators include 2,2'-azobisisobutyronitrile (AIBN), 2,2'-azobis-2-methylbutyronitrile, 2,2'-azobis(2-methylpropionate)dimethyl, and 4,4'-azobis-4-cyanovaleric acid. The amount of polymerization initiator used is, for example, preferably 0.05 to 0.5 parts by weight, more preferably 0.1 to 0.3 parts by weight, per 100 parts by weight of the total amount of monomer components.

[0161] Examples of active energy rays used in active energy ray polymerization include ionizing radiation such as α-rays, β-rays, γ-rays, neutron beams, and electron beams, and ultraviolet rays, with ultraviolet rays being preferred. Polymerization by irradiation with ultraviolet rays is also called photopolymerization. The polymerization system for active energy ray polymerization typically contains a photopolymerization initiator.

[0162] Examples of the photopolymerization initiator include a benzoin ether-based photopolymerization initiator, an acetophenone-based photopolymerization initiator, an α-ketol-based photopolymerization initiator, an aromatic sulfonyl chloride-based photopolymerization initiator, a photoactive oxime-based photopolymerization initiator, a benzoin-based photopolymerization initiator, a benzyl-based photopolymerization initiator, a benzophenone-based photopolymerization initiator, a ketal-based photopolymerization initiator, and a thioxanthone-based photopolymerization initiator.

[0163] 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-diphenylethan-1-one, and anisole methyl ether. Examples of acetophenone-based photopolymerization initiators include 2,2-diethoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 1-hydroxycyclohexyl phenyl ketone, 4-phenoxydichloroacetophenone, and 4-(t-butyl)dichloroacetophenone. Examples of α-ketol-based photopolymerization initiators include 2-methyl-2-hydroxypropiophenone and 1-[4-(2-hydroxyethyl)phenyl]-2-methylpropan-1-one. Examples of aromatic sulfonyl chloride-based photopolymerization initiators include 2-naphthalenesulfonyl chloride. An example of a photoactive oxime-based photopolymerization initiator is 1-phenyl-1,1-propanedione-2-(o-ethoxycarbonyl)-oxime. An example of a benzoin-based photopolymerization initiator is benzoin. An example of a benzyl-based photopolymerization initiator is benzil. An example of a benzophenone-based photopolymerization initiator is benzophenone, benzoylbenzoic acid, 3,3'-dimethyl-4-methoxybenzophenone, polyvinylbenzophenone, and α-hydroxycyclohexyl phenyl ketone. An example of a ketal-based photopolymerization initiator is benzil dimethyl ketal. An example of a thioxanthone-based photopolymerization initiator is thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-diisopropylthioxanthone, and dodecylthioxanthone.

[0164] The amount of the photopolymerization initiator used is, for example, preferably 0.01 to 1 part by weight, more preferably 0.05 to 0.5 part by weight, based on 100 parts by weight of the total amount of the monomer components.

[0165] Examples of the crosslinking agent include polyfunctional isocyanate-based crosslinking agents, epoxy-based crosslinking agents, melamine-based crosslinking agents, peroxide-based crosslinking agents, as well as urea-based crosslinking agents, metal alkoxide-based crosslinking agents, metal chelate-based crosslinking agents, metal salt-based crosslinking agents, carbodiimide-based crosslinking agents, oxazoline-based crosslinking agents, aziridine-based crosslinking agents, amine-based crosslinking agents, etc. Among these, at least one selected from the group consisting of polyfunctional isocyanate-based crosslinking agents and epoxy-based crosslinking agents is preferred in terms of being able to further exhibit the effects of the present invention.

[0166] 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 tolylene diisocyanate, and hydrogenated xylene diisocyanate; and aromatic polyisocyanates such as 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, and xylylene diisocyanate. Examples of polyfunctional isocyanate crosslinking agents include commercially available products such as trimethylolpropane / tolylene diisocyanate adduct (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name "Coronate L"), trimethylolpropane / hexamethylene diisocyanate adduct (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name "Coronate HL"), hexamethylene diisocyanate isocyanurate (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name "Coronate HX"), and trimethylolpropane / xylylene diisocyanate adduct (manufactured by Mitsui Chemicals, Inc., trade name "Takenate 110N").

[0167] Examples of epoxy crosslinking agents (polyfunctional epoxy compounds) include N,N,N',N'-tetraglycidyl-m-xylylenediamine, diglycidylaniline, 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 polyglycidyl ether, and methyl ... Examples of the epoxy crosslinking agent include diglycidyl ether, glycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, polyglycerol polyglycidyl ether, sorbitan polyglycidyl ether, trimethylolpropane polyglycidyl ether, adipic acid diglycidyl ester, o-phthalic acid diglycidyl ester, triglycidyl-tris(2-hydroxyethyl)isocyanurate, resorcinol diglycidyl ether, bisphenol-S-diglycidyl ether, and epoxy resins having two or more epoxy groups in the molecule. Examples of the epoxy crosslinking agent include commercially available products such as "Tetrad C" (manufactured by Mitsubishi Gas Chemical Company, Inc.).

[0168] The content of the crosslinking agent in the acrylic pressure-sensitive adhesive composition may be any appropriate content as long as the effects of the present invention are not impaired. For example, in order to further exhibit the effects of the present invention, the content is preferably 0.1 to 30% by weight, more preferably 0.1 to 10% by weight, even more preferably 0.1 to 5.0 parts by weight, still more preferably 0.2 to 4.5 parts by weight, particularly preferably 0.3 to 4.0 parts by weight, and most preferably 0.4 to 3.5 parts by weight, relative to the solid content (100 parts by weight) of the acrylic polymer.

[0169] The acrylic pressure-sensitive adhesive composition may contain any other appropriate components as long as they do not impair the effects of the present invention.Such other components include, for example, 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.), antioxidants, inorganic fillers, organic fillers, metal powders, colorants (pigments, dyes, etc.), foil-like materials, 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.

[0170] The solid content concentration of the acrylic pressure-sensitive adhesive composition is, for example, 5 to 50% by weight, and preferably 10 to 40% by weight.

[0171] The first pressure-sensitive adhesive layer can be formed from the acrylic pressure-sensitive adhesive composition by any appropriate method as long as the effects of the present invention are not impaired.

[0172] In one embodiment of the method for forming the first PSA layer from the acrylic PSA composition, for example, the acrylic PSA composition is applied to a substrate sheet to form a coating layer, and the resulting coating layer is dried to form the first PSA layer, thereby obtaining a laminate comprising the substrate sheet / first PSA layer in this order.

[0173] The base sheet may be, for example, a release film. Examples of materials that can be used for the release film include porous materials such as plastic films, paper, cloth, and nonwoven fabrics; nets; foam sheets; metal foils; and laminates thereof.

[0174] Examples of plastic films include polyethylene films, polypropylene films, polybutene films, polybutadiene films, polymethylpentene films, polyvinyl chloride films, vinyl chloride copolymer films, polyethylene terephthalate films, polybutylene terephthalate films, polyurethane films, and ethylene-vinyl acetate copolymer films.

[0175] The thickness of the release film is, for example, 5 μm to 200 μm, and preferably about 5 μm to 100 μm. The release film may be subjected to a release treatment using various release agents, such as a silicone-based release agent, a fluorine-based release agent, a long-chain alkyl-based release agent, a fatty acid amide-based release agent, or silica powder.

[0176] Examples of methods for applying the acrylic pressure-sensitive adhesive composition to a substrate sheet include roll coating, kiss roll coating, gravure coating, reverse coating, roll brushing, spray coating, dip roll coating, bar coating, knife coating, air knife coating, curtain coating, lip coating, and extrusion coating using a die coater, etc. The amount of coating can be adjusted appropriately depending on the purpose.

[0177] The coating layer is dried to harden the coating layer and form a first pressure-sensitive adhesive layer. Any appropriate drying temperature can be used for drying the coating layer as long as it does not impair the effects of the present invention. Such a drying temperature is, 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.

[0178] The drying time of the coating layer can be any appropriate time within a range that does not impair the effects of the present invention, such as 10 to 1000 seconds, preferably 30 to 300 seconds, more preferably 40 to 240 seconds, and particularly preferably 60 to 180 seconds.

[0179] <1-3-c. First Adhesive Layer> As the first adhesive layer, any suitable adhesive layer may be used as long as the effects of the present invention are not impaired, and any suitable adhesive layer formed (typically formed by curing) from an adhesive composition may be used. Examples of such adhesive compositions include adhesive compositions containing an epoxy resin and an amine compound.

[0180] Examples of epoxy resins include bifunctional epoxy resins such as bisphenol A type epoxy, novolac type epoxy resins such as phenol novolac type epoxy resins and cresol novolac type epoxy resins, polyfunctional epoxy resins, glycidylamine type epoxy resins, heterocycle-containing epoxy resins, and alicyclic epoxy resins.

[0181] Examples of the amine compound include diethylenetriamine, triethylenetetramine, methylenebis(2-chloroaniline), methylenebis(2-methyl-6-methylaniline), 1,5-naphthalene diisocyanate, and n-butylbenzylphthalate.

[0182] The amount of the amine compound to be blended relative to 100 parts by weight of the epoxy resin may be any appropriate amount as long as the effects of the present invention are not impaired. For example, the amount of such an amine compound to be blended relative to 100 parts by weight of the epoxy resin is preferably 1 to 100 parts by weight, more preferably 5 to 80 parts by weight, even more preferably 10 to 60 parts by weight, and particularly preferably 15 to 50 parts by weight.

[0183] The adhesive composition may contain any other appropriate components as long as the effects of the present invention are not impaired.

[0184] <1-4. Second adhesive layer> Any appropriate pressure-sensitive adhesive layer or adhesive layer may be adopted as the second adhesive layer, as long as the effects of the present invention are not impaired. The second adhesive layer is preferably a pressure-sensitive adhesive layer (second adhesive layer). For such a second adhesive layer, for example, the description of the first adhesive layer in <1-3. First adhesive layer> may be used. In particular, the description of the first adhesive layer obtained from the solvent-based pressure-sensitive adhesive composition (II) in <1-3. First adhesive layer> may be used preferably.

[0185] However, as described above, the thickness of the second pressure-sensitive adhesive layer is preferably 5 μm to 20 μm, more preferably 5 μm to 17 μm, even more preferably 5 μm to 16 μm, particularly preferably 5 μm to 15 μm, and most preferably 5 μm to 14 μm.

[0186] <1-5. Third adhesive layer> Any appropriate pressure-sensitive adhesive layer or adhesive layer may be adopted as the third adhesive layer, as long as the effects of the present invention are not impaired. The third adhesive layer is preferably a pressure-sensitive adhesive layer (third adhesive layer). For such a third adhesive layer, for example, the description of the first adhesive layer in <1-3. First adhesive layer> may be used. In particular, the description of the first adhesive layer obtained from the solvent-based pressure-sensitive adhesive composition (II) in <1-3. First adhesive layer> may be used preferably.

[0187] However, as described above, the thickness of the third adhesive layer is preferably 5 μm to 20 μm, more preferably 5 μm to 17 μm, even more preferably 5 μm to 16 μm, particularly preferably 5 μm to 15 μm, and most preferably 5 μm to 14 μm.

[0188] <1-6. First Optical Member> As the first optical member, any appropriate optical member can be used as long as it is a member that can impart optical functionality to the optical laminate according to an embodiment of the present invention, as long as the effects of the present invention are not impaired. Examples of such optical members include an anti-reflection laminate and a laminate for preventing sunglass wear.

[0189] The thickness of the first optical member is typically 40 μm to 120 μm, and preferably 70 μm to 100 μm.

[0190] One embodiment of the first optical member is an antireflection laminate. The antireflection laminate typically includes a first substrate, a hard coat layer disposed on the viewing side of the first substrate, and an antireflection layer disposed on the viewing side of the hard coat layer. The hard coat layer may be formed directly on the viewing side surface of the first substrate. The antireflection layer may be formed directly on the viewing side surface of the hard coat layer. The antireflection laminate may be a member having a laminated structure of antireflection layer / hard coat layer / first substrate. The antireflection laminate includes a first substrate laminated with a first pressure-sensitive adhesive layer.

[0191] <1-6-a. First Substrate> The first substrate is typically used to form a hard coat layer and an anti-reflection layer. Any appropriate resin film can be used as the first substrate. Examples of materials for forming the first substrate include polyester-based resins such as polyethylene terephthalate (PET), cycloolefin-based resins such as norbornene-based resins, resins (COC) obtained by addition polymerization of cycloolefins (e.g., norbornene) and α-olefins (e.g., ethylene), and cellulose-based resins such as triacetyl cellulose (TAC). One embodiment of the first substrate includes a cellulose-based resin such as TAC.

[0192] The thickness of the first substrate can be appropriately set depending on 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.

[0193] <1-6-b. Hard Coat Layer> The hard coat layer can impart, for example, excellent pencil hardness to the optical laminate. Furthermore, by appropriately adjusting the difference in refractive index between the hard coat layer and the antireflection layer, the reflectance of the optical laminate can be further reduced.

[0194] The hard coat layer preferably has sufficient surface hardness, excellent mechanical strength, and excellent light transmittance. The hard coat layer can be formed from any appropriate resin as long as it has such desired properties. Specific examples of the resin include thermosetting resins, thermoplastic resins, ultraviolet curing resins, electron beam curing resins, and two-component mixed resins. Among the resins that form the hard coat layer, ultraviolet curing resins are preferred. When the resin is an ultraviolet curing resin, the hard coat layer can be formed with simple operation and high efficiency.

[0195] Specific examples of UV-curable resins include polyester-based, acrylic-based, urethane-based, amide-based, silicone-based, and epoxy-based UV-curable resins. UV-curable resins include UV-curable monomers, oligomers, and polymers. Preferred UV-curable resins include resin compositions containing acrylic monomer or oligomer components having preferably two or more, and more preferably three to six, UV-polymerizable functional groups. Typically, UV-curable resins contain a photopolymerization initiator.

[0196] The hard coat layer can be formed by any appropriate method. For example, the hard coat layer can be formed by coating a resin composition for forming a hard coat layer on a first substrate, drying the coating, and curing the dried coating film by irradiating it with ultraviolet light.

[0197] The thickness of the hard coat layer is, for example, 0.5 μm to 20 μm, and preferably 1 μm to 15 μm.

[0198] Details of the hard coat layer and the adhesion structure between the hard coat layer and the antireflection layer are described in, for example, JP 2016-224443 A, the disclosure of which is incorporated herein by reference.

[0199] <1-6-c. Antireflection Layer> The antireflection layer is provided to prevent reflection of external light (e.g., fluorescent light) and the like. Any appropriate configuration can be adopted as the configuration of the antireflection layer. Typical configurations of the antireflection layer include, for example, (1) a single layer of a low refractive index layer having 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, from the first substrate, a medium refractive index layer, a high refractive index layer, and a low refractive index layer in this order; and (3) an alternating multilayer laminate of a high refractive index layer and a low refractive index layer.

[0200] Materials that can form the low-refractive-index layer include, for example, silicon oxide (SiO2) and magnesium fluoride (MgF2). The refractive index of the low-refractive-index layer is typically approximately 1.35 to 1.55. Materials that can form the high-refractive-index layer include, for example, titanium oxide (TiO2), niobium oxide (Nb2O3 or Nb2O5), tin-doped indium oxide (ITO), antimony-doped tin oxide (ATO), and ZrO2-TiO2. The refractive index of the high-refractive-index layer is typically approximately 1.60 to 2.20. Materials that can form the medium-refractive-index layer include, for example, titanium oxide (TiO2) and a mixture of a material that can form a low-refractive-index layer and a material that can form a high-refractive-index layer (e.g., a mixture of titanium oxide and silicon oxide). The refractive index of the medium-refractive-index layer is typically approximately 1.50 to 1.85. The thicknesses of the low-refractive-index layer, medium-refractive-index layer, and high-refractive-index layer can be set to achieve an appropriate optical film thickness depending on the layer structure of the anti-reflection layer, the desired anti-reflection performance, etc.

[0201] The antireflection layer is typically formed by a dry process. Specific examples of the dry process include PVD (Physical Vapor Deposition) and CVD (Chemical Vapor Deposition). PVD methods include vacuum deposition, reactive vapor deposition, ion beam assisted deposition, sputtering, and ion plating. CVD methods include plasma CVD. The dry process for forming the antireflection layer is preferably sputtering.

[0202] The thickness of the antireflection layer is, for example, about 20 nm to 300 nm.

[0203] The difference between the maximum reflectance and the minimum reflectance of the antireflection layer in the wavelength range of 400 nm to 700 nm 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 reflectance and the minimum reflectance is in this range, coloring of reflected light can be effectively prevented.

[0204] The antireflection layer is typically located on the outermost surface of the optical laminate on the viewing side. The moisture permeability of the antireflection layer is typically 1.0 g / mm 2 or less, preferably 0.01 g / mm 2 ~0.1g / mm 2 The moisture permeability is measured in accordance with the moisture permeability test (cup method) of JIS Z0208 (for example, JIS Z0208:1976) in an atmosphere at a temperature of 40°C and a humidity of 92% RH, over an area of ​​1 m 2 When the moisture permeability of the antireflection layer located on the outermost surface is equal to or less than the upper limit, warping of the optical laminate in a high-humidity environment can be more stably suppressed.

[0205] The antireflection layer does not have to be located on the outermost surface of the optical laminate. The antireflection laminate may have an outermost layer on the viewing side of the antireflection layer, if necessary. That is, the antireflection laminate may be composed of a first substrate, a hard coat layer, an antireflection layer, and an outermost layer. The moisture permeability range of the outermost layer is the same as that of the antireflection layer described above. Examples of the outermost layer include an antifouling layer. The antifouling layer contains, for example, a fluorine group-containing silane-based compound (e.g., an alkoxysilane compound having a perfluoropolyether group) or a fluorine group-containing organic compound. The antifouling layer preferably exhibits water repellency with a water contact angle of 110 degrees or more.

[0206] <1-7. Second Optical Member> Any appropriate optical member can be adopted as the second optical member as long as the effects of the present invention are not impaired. The second optical member is typically a member that can impart excellent resistance to local loads to the optical laminate according to an embodiment of the present invention.

[0207] When the optical laminate according to the embodiment of the present invention includes a second optical member, the configurations shown in Figs. 2 and 3 can be typically adopted.

[0208] When the optical laminate according to the embodiment of the present invention has the configuration shown in Fig. 2 , the second optical member 32 is bonded to the viewing side of the polarizing film 10 via the second adhesive layer 22. The second optical member 32 is disposed between the first adhesive layer 21 and the second adhesive layer 22. The second optical member 32 is in contact with the first adhesive layer 21 and the second adhesive layer 22, and is pressure-sensitively bonded to the first adhesive layer 21 and the second adhesive layer 22.

[0209] 3 , the second optical member 32 is bonded to the viewing side of the third optical member 33 via the second adhesive layer 22. The second optical member 32 is disposed between the first adhesive layer 21 and the second adhesive layer 22. The second optical member 32 is in contact with the first adhesive layer 21 and the second adhesive layer 22, and is pressure-sensitively bonded to the first adhesive layer 21 and the second adhesive layer 22.

[0210] The second optical member is formed of any appropriate film. Specific examples of the material that forms the main component of the second optical member include the same materials that form the main component of the protective layer described in Section <1-2-b. Protective Layer> (the transparent resins described above, the thermosetting resins or ultraviolet-curing resins described above, the glassy polymers described above, and the resin compositions described above). In one embodiment of the present invention, the second optical member contains a (meth)acrylic resin, preferably a (meth)acrylic resin having a glutarimide structure. That is, each of the protective layer and the second optical member contains a (meth)acrylic resin. By using a (meth)acrylic resin for the protective layer and the second optical member, light leakage can be stably suppressed when a load equal to or greater than a predetermined value is locally applied to the optical laminate.

[0211] The second optical member may be subjected to the above-mentioned surface treatment and / or the above-mentioned treatment for improving visibility, as well as the protective layer, if necessary.

[0212] The thickness of the second optical member is typically 20 μm to 70 μm, and preferably 30 μm to 50 μm. When the thickness of the second optical member is in this range, the optical laminate can be provided with excellent resistance to local loads, and warping of the optical laminate in a high-humidity environment can be sufficiently suppressed.

[0213] <1-8. Third Optical Member> As the third optical member, any appropriate optical member can be used as long as it is a member that can impart optical functionality to the optical laminate according to an embodiment of the present invention, as long as the effects of the present invention are not impaired. Examples of such optical members include an anti-glare laminate and an anti-sunglasses laminate.

[0214] When the optical laminate according to the embodiment of the present invention includes a third optical member, the configuration shown in FIG. 3 can be typically adopted.

[0215] The thickness of the third optical member is typically 20 μm to 60 μm, and preferably 30 μm to 50 μm.

[0216] One embodiment of the third optical member is an anti-glare laminate. The anti-glare laminate includes an anti-glare layer and a second substrate arranged on the viewing side of the anti-glare layer. The anti-glare layer is supported by the second substrate. The anti-glare layer is arranged on the viewing side of the protective layer and is bonded to the protective layer via a third adhesive layer 23. The anti-glare 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 located on the opposite side of the anti-glare layer from the third adhesive layer 23. The second substrate is in contact with the second adhesive layer 22 and is pressure-sensitively bonded to the second adhesive layer 22.

[0217] <1-8-a. Anti-glare Layer> The anti-glare layer is provided to prevent reflections of the face of a user of the image display device, the keyboard of the image display device, external light (e.g., fluorescent light), etc. In one embodiment of the present invention, the anti-glare layer is a layer of a liquid crystal compound with a fixed orientation. In this specification, the term "fixed orientation layer" refers to a layer in which the liquid crystal compound is oriented in a predetermined direction within the layer and the orientation state is fixed. The term "fixed orientation layer" encompasses a concept that includes a hardened orientation layer obtained by hardening a liquid crystal monomer. The liquid crystal compound may be a rod-shaped liquid crystal compound, a discotic (discotic) liquid crystal compound, or a combination thereof.

[0218] In one embodiment of the present invention, the anti-glare layer contains a discotic liquid crystal compound. More specifically, the anti-glare layer is a layer in which a discotic liquid crystal compound is fixed in a state where it is aligned in a predetermined direction. A discotic liquid crystal compound generally refers to a liquid crystal compound having a discotic molecular structure in which a cyclic mother nucleus such as benzene, 1,3,5-triazine, or calixarene is located at the center of the molecule and linear alkyl groups, alkoxy groups, substituted benzoyloxy groups, or the like are radially substituted as side chains. Representative examples of discotic liquid crystals include benzene derivatives, triphenylene derivatives, truxene derivatives, and phthalocyanine derivatives described in the research report by C. Destrade et al., Mol. Cryst. Liq. Cryst., Vol. 71, p. 111 (1981), and compounds described in the research report by B. Kohne et al., Angew. Chem. 96, p. 70 (1984), and azacrown-based and phenylacetylene-based macrocycles described in the research report by J. M. Lehn et al., J. Chem. Soc. Chem. Commun., p. 1794 (1985), and the research report by J. Zhang et al., J. Am. Chem. Soc., vol. 116, p. 2655 (1994). Further specific examples of discotic liquid crystal compounds include compounds described in JP-A-2006-133652, JP-A-2007-108732, JP-A-2010-244038, and JP-A-2014-214177. The descriptions in the above-mentioned documents and publications are incorporated herein by reference. The anti-glare layer containing a discotic liquid crystal compound can typically be a so-called negative A plate having refractive index characteristics of nx=nz>ny.

[0219] In another embodiment, the anti-glare layer contains a rod-shaped liquid crystal compound. More specifically, the anti-glare layer is oriented (homogeneous orientation) in a state where the rod-shaped liquid crystal compound is aligned in a predetermined direction (typically, the slow axis direction). Examples of rod-shaped liquid crystal compounds include liquid crystal compounds having a nematic liquid crystal phase (nematic liquid crystals). Examples of such liquid crystal compounds that can be used include liquid crystal polymers and liquid crystal monomers. The mechanism by which the liquid crystal compound exhibits liquid crystallinity may be either lyotropic or thermotropic. The liquid crystal polymer and liquid crystal monomer may be used alone or in combination. Any appropriate liquid crystal monomer may be used as the liquid crystal monomer. For example, polymerizable mesogenic compounds described in JP-A-2002-533742 (WO 00 / 37585), EP 358208 (US Pat. No. 5,211,877), EP 66137 (US Pat. No. 4,388,453), WO 93 / 22397, EP 0,261,712, DE 19,504,224, DE 4,408,171, and GB 2,280,445 can be used. Specific examples of such polymerizable mesogenic compounds include LC242 (product name) from BASF, E7 (product name) from Merck, and LC-Silicon-CC3767 (product name) from Wacker-Chem. Nematic liquid crystal monomers are preferred as liquid crystal monomers. Specific examples of liquid crystal compounds are described in JP-A-2006-163343, for example. The disclosures of these publications are incorporated herein by reference. The anti-glare layer containing a rod-like liquid crystal compound can be typically a so-called positive A plate having refractive index characteristics of nx>ny=nz.

[0220] The anti-glare layer can typically function as a λ / 2 plate. When the anti-glare layer functions as a λ / 2 plate, glare can be effectively prevented by controlling its orientation angle (or slow axis direction). The in-plane retardation Re(550) of such an anti-glare layer is 220 nm to 320 nm, more preferably 240 nm to 300 nm, and even more preferably 250 nm to 280 nm.

[0221] The angle formed by the slow axis of the anti-glare 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 arranging the anti-glare layer, which functions as a λ / 2 plate, at such an axial angle, it is possible to effectively prevent glare.

[0222] The thickness of the anti-glare layer is preferably 1 μm to 5 μm, and more preferably 1 μm to 3 μm.

[0223] When an alignment film is used to align the liquid crystal compound, the anti-glare laminate further includes an alignment film between the anti-glare layer and the second substrate. That is, the anti-glare laminate may be composed of an anti-glare layer, an alignment film, and a second substrate. The alignment film generally contains a polymer material as a main component. Typical examples of polymer materials include polyvinyl alcohol, polyimide, and derivatives thereof. In one embodiment of the present invention, modified or unmodified polyvinyl alcohol is preferred. For example, modified polyvinyl alcohols described in WO 01 / 88574 A1 and Japanese Patent No. 3907735 can be used as the alignment film. The alignment film is typically subjected to an alignment treatment. Typical examples of alignment treatments include rubbing treatment and photoalignment treatment. Since rubbing treatments are well known in the art, a detailed description thereof will be omitted. Examples of the photo-aligned alignment film (photo-alignment film) that can be used include those described in WO2005 / 096041 and a product manufactured by Rolic Technologies under the trade name LPP-JP265CP. 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.

[0224] The anti-glare layer can be formed, for example, by the following procedure. First, a coating liquid for forming an alignment film is applied to a second substrate and dried to form a coating film. This coating film is rubbed in a predetermined direction to form an alignment film on the second substrate. This predetermined direction may correspond to the slow axis direction of the resulting anti-glare layer. Next, a coating liquid for forming an anti-glare layer (e.g., a solution containing a liquid crystal compound and, if necessary, a crosslinkable monomer) is applied to the formed alignment film and heated. Heating removes the solvent from the coating liquid and promotes alignment of the liquid crystal compound. Heating can be performed in a single step or in multiple steps at different temperatures. Next, ultraviolet light is irradiated to crosslink (or polymerize) the crosslinkable (or polymerizable) monomer, thereby fixing the alignment of the liquid crystal compound. In this way, an anti-glare layer is formed on the second substrate (essentially, on the alignment film). A method for aligning discotic liquid crystal compounds is described, for example, in JP 2014-214177 A, and a method for aligning rod-shaped liquid crystal compounds is described, for example, in JP 2006-163343 A. The descriptions in these publications are incorporated herein by reference. The alignment film may be omitted depending on the desired alignment state, the type of liquid crystal compound, and the like.

[0225] <1-8-b. Second Substrate> The second substrate can be used to form an anti-glare layer.

[0226] Any appropriate resin film can be used as the second substrate. Examples of materials for forming the resin film include polyester-based resins such as polyethylene terephthalate (PET), cycloolefin-based resins such as norbornene-based resins, resins (COC) obtained by addition polymerization of cycloolefins (e.g., norbornene) and α-olefins (e.g., ethylene), and cellulose-based resins such as triacetyl cellulose (TAC). In one embodiment of the present invention, the second substrate includes a cellulose-based resin such as TAC.

[0227] The thickness of the second substrate can be appropriately set depending on 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.

[0228] <1-9. First Retardation Film> The first retardation film may be a retardation film having any appropriate optical and / or mechanical properties depending on the purpose. The first retardation film is located on the side opposite the viewing side of the polarizing film. The first retardation film is typically attached to the side opposite the viewing side of the polarizing film via any appropriate adhesive layer. The first retardation film may also serve as a protective layer on the side opposite the viewing side of the polarizer.

[0229] The thickness of the first retardation film is preferably 10 μm to 60 μm, and more preferably 30 μm to 50 μm.

[0230] The in-plane retardation Re(550) of the first retardation film is preferably 80 nm to 150 nm, more preferably 90 nm to 140 nm, and further preferably 100 nm to 130 nm.

[0231] The first retardation film preferably has refractive index characteristics that satisfy the relationship nx>ny>nz. The Nz coefficient of the first retardation film is preferably 1.1 to 3.0, and more preferably 1.3 to 2.7.

[0232] The first retardation film can preferably be arranged so that its slow axis is substantially parallel to the absorption axis of the polarizer. In this specification, the expressions "substantially parallel" and "almost 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 "almost 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, when simply referring to "orthogonal" or "parallel," it can include the substantially orthogonal or substantially parallel state.

[0233] The first retardation film preferably has an absolute value of the photoelastic coefficient of 2×10 -11 m 2 The absolute value of the photoelastic coefficient is more preferably 2.0×10 -13 m 2 / N ~ 1.5 x 10 -11 m2 / N, and more 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 suitable for suppressing display defects can be obtained even when a small object collides with or presses the screen over a small contact area. If the absolute value of the photoelastic coefficient is within this range, phase difference change is unlikely to occur when shrinkage stress occurs during heating. Therefore, by forming the first retardation film using a resin having such an absolute value of the photoelastic coefficient, thermal unevenness can be effectively prevented when the optical laminate is applied to an image display device.

[0234] The first retardation film may exhibit a reverse wavelength dispersion characteristic in which the retardation value increases with the wavelength of the measurement light, a positive wavelength dispersion characteristic in which the retardation value decreases with the wavelength of the measurement light, or a flat wavelength dispersion characteristic in which the retardation value changes little with the wavelength of the measurement light. The first retardation film preferably exhibits a flat wavelength dispersion characteristic. Specifically, the Re(450) / Re(550) of the first retardation film 7 is preferably 0.99 to 1.03, and the Re(650) / Re(550) is preferably 0.98 to 1.02. By arranging a λ / 2 plate (first retardation film) and a λ / 4 plate (second retardation film) having flat wavelength dispersion characteristics at a predetermined axial angle, it is possible to obtain characteristics close to the ideal reverse wavelength dispersion characteristic, and as a result, it is possible to realize excellent antireflection properties.

[0235] The first retardation film may be composed of any appropriate resin film that can satisfy the above-described characteristics. Representative examples of such resins include cyclic olefin-based resins, polycarbonate-based resins, cellulose-based resins, polyester-based resins, polyvinyl alcohol-based resins, polyamide-based resins, polyimide-based resins, polyether-based resins, polystyrene-based resins, and acrylic-based resins. Among these, cyclic olefin-based resins may be preferably used. The first retardation film 7 may be obtained, for example, by stretching a film formed from the above-described resin. Details of cyclic olefin-based resins and methods for stretching resin films (methods for forming retardation films) are described, for example, in JP 2015-210459 A and JP 2016-105166 A. The disclosures of these publications are incorporated herein by reference.

[0236] <1-10. Second Retardation Film> The second retardation film may be a retardation film having any suitable optical and / or mechanical properties depending on the purpose. The second retardation film is located on the side opposite the viewing side of the first retardation film. The second retardation film is typically attached to the side opposite the viewing side of the first retardation film via any suitable adhesive layer.

[0237] The thickness of the second retardation film is preferably 10 μm to 50 μm, and more preferably 20 μm to 40 μm.

[0238] The in-plane retardation Re(550) of the second retardation film is preferably 10 nm to 60 nm, more preferably 20 nm to 50 nm, and even more preferably 30 nm to 40 nm.

[0239] The second retardation film preferably has refractive index characteristics that satisfy the relationship nz>nx>ny. The Nz coefficient of the second retardation film is preferably −10 to −0.1, and more preferably −5 to −1.

[0240] The second retardation film can be preferably disposed so that its slow axis is substantially perpendicular to the absorption axis of the polarizer.

[0241] The second retardation film may be composed of any appropriate resin film that can satisfy the above-mentioned characteristics. Such a resin may typically be a polymer having negative intrinsic birefringence. A polymer having negative intrinsic birefringence refers to a polymer in which, when oriented by stretching or the like, the refractive index in the orientation direction becomes relatively small. Examples of polymers having negative intrinsic birefringence include those in which chemical bonds or functional groups with large polarization anisotropy, such as aromatic or carbonyl groups, are introduced into the side chains of the polymer. Specific examples include modified polyolefin-based resins (e.g., modified polyethylene-based resins), acrylic-based resins, styrene-based resins, maleimide-based resins, fumaric acid ester-based resins, etc. The second retardation film may be obtained, for example, by appropriately stretching a film formed from the above-mentioned resin.

[0242] In one embodiment of the present invention, the optical stack includes a first retardation film and a second retardation film, but the optical stack does not necessarily include the first retardation film and / or the second retardation film.

[0243] <1-11. Panel-Side Pressure-Sensitive Adhesive Layer> The panel-side pressure-sensitive adhesive layer is located on the side opposite to the viewing side of the second retardation film. The panel-side pressure-sensitive adhesive layer is typically formed by coating any appropriate pressure-sensitive adhesive on the second retardation film. The thickness of the panel-side pressure-sensitive adhesive layer is preferably 1 μm to 60 μm, and more preferably 5 μm to 30 μm. In one embodiment of the present invention, the optical laminate includes a panel-side pressure-sensitive adhesive layer, but the optical laminate does not necessarily include a panel-side pressure-sensitive adhesive layer.

[0244] Any appropriate pressure-sensitive adhesive layer can be used as the panel-side pressure-sensitive adhesive layer as long as the effects of the present invention are not impaired. A typical example of such a pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer composed of any appropriate pressure-sensitive adhesive that can be used to bond a retardation film to another member. For example, the description of the first pressure-sensitive adhesive layer in Section <1-3. First pressure-sensitive adhesive layer> can be used. In particular, the description of the first pressure-sensitive adhesive layer obtained from the solvent-based pressure-sensitive adhesive composition (II) in Section <1-3. First pressure-sensitive adhesive layer> can be used preferably.

[0245] <<2. Image Display Device>> The optical laminate according to an embodiment of the present invention can be applied to an image display device. Accordingly, one embodiment of the present invention also encompasses 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. An image display device according to an embodiment of the present invention typically includes an optical laminate according to an embodiment of the present invention on the viewing side. The image display device includes an image display panel. The image display panel includes an image display cell. Note that the image display device may be referred to as an optical display device, the image display panel may be referred to as an optical display panel, and the image display cell may be referred to as an optical display cell.

[0246] The present invention will be specifically described below using examples, but the present invention is not limited to these examples. The test and evaluation methods used in the examples are as follows. The term "parts" means "parts by weight" unless otherwise specified, and the term "%" means "% by weight" unless otherwise specified.

[0247] <Calculation of Residual Stress Decay Rate ΔF (%) and Maximum Strain Rate ΔL (%)> (Piercing Test) The optical laminates obtained in the Examples and Comparative Examples were cut into 5 cm × 5 cm pieces to prepare test samples. The obtained test samples were then bonded to a 1.2 mm thick glass plate via the panel-side adhesive layer. The test sample bonded to the glass plate was placed on the stage of a measuring device (manufactured by Instron, product name "5581") equipped with a piercing jig. The radius of curvature R of the tip of the piercing jig was 550 μm. The piercing jig was pierced into the test sample on the stage at a piercing speed of 0.9 mm / min under room temperature (23°C ± 3°C). As shown in FIG. 4 , the load F (kgf) was measured after reaching the maximum load Fp (kgf) and maintaining the load for 15 seconds, and the displacement L (μm) was measured at the time the maximum load Fp (kgf) was reached. (Calculation) Using the maximum load Fp (kgf) obtained in the puncture test, the load F (kgf) after 15 seconds of holding the load after reaching the maximum load Fp (kgf), the displacement L (μm) when the maximum load Fp (kgf) was reached, and the total thickness T (μm) of the optical laminate to be measured, 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). Formula (1): ΔF = [(Fp - F) / Fp] × 100 Formula (2): ΔL = (L / T) × 100

[0248] <Light Leakage Evaluation> The optical laminates obtained in the examples and comparative examples were cut into 5 cm x 5 cm pieces to serve as test samples. The resulting test samples were then bonded to a 1.2 mm-thick glass plate via the panel-side adhesive layer. The test sample bonded to the glass plate was placed on the stage of an Indenter CMS tester (manufactured by Instron, product name "5581") equipped with a piercing jig. The radius of curvature R of the tip of the piercing jig was 550 μm. The piercing jig was pierced into the test sample on the stage at room temperature (23°C ± 3°C) with a load of 8.5 kg. The polarizer of the optical laminate after the piercing test and a polarizer attached to a microscope were arranged in a crossed Nicol configuration. Light leakage at this time was observed using a microscope (objective lens magnification: 5x). Evaluation was based on the following criteria: A: No light leakage was observed, or slight light leakage was observed, but not a practical problem. B: Light leakage was observed to a degree that affected practical use. C: Light leakage is observed to an extent that is practically unacceptable.

[0249] <Peeling Evaluation> The optical laminates obtained in the examples and comparative examples were cut into 5 cm x 5 cm pieces to prepare test samples. The obtained test samples were then bonded to a 1.2 mm thick glass plate via the panel-side pressure-sensitive adhesive layer. The test sample bonded to the glass plate was placed on the stage of an Indenter CMS tester (manufactured by Instron, product name "5581") equipped with a piercing jig. The radius of curvature R of the tip of the piercing jig was 550 μm. The piercing jig was pierced into the test sample on the stage at room temperature (23°C ± 3°C) with a load of 8.5 kg (piercing test). Peeling of the sample after piercing was visually confirmed. Evaluation was based on the following criteria: ∘: No peeling occurred; Δ: No peeling occurred immediately after the piercing test, but peeling was observed one week later; ×: Peeling occurred immediately after the piercing test.

[0250] <Evaluation of glue thickness accuracy> The optical laminates obtained in the examples and comparative examples were cut into 150 mm x 150 mm pieces to prepare test samples. The thickness was measured at 10 locations using a digital gauge (manufactured by Ozaki Seisakusho Co., Ltd., product name "Digital Upright Gauge R1N-225"). The average thickness was calculated, and the variation was evaluated. Evaluation was based on the following criteria: ◯: The variation was within 10% of the glue thickness. ×: The variation was greater than 10% of the glue thickness.

[0251] <Photoelastic Coefficient> A sample was prepared by cutting out a measurement object into a size of 20 mm x 100 mm. The prepared sample was measured with an ellipsometer (manufactured by JASCO Corporation, M-150) using light with a wavelength of 550 nm to measure the photoelastic coefficient.

[0252] [Production Example 1]: Production of Polarized Film A long, amorphous isophthalic copolymerized polyethylene terephthalate film (thickness: 100 μm) with a Tg of approximately 75°C was used as the thermoplastic resin substrate. One side of the resin substrate was subjected to a corona treatment. A PVA-based resin (a 9:1 mixture of polyvinyl alcohol (degree of polymerization: 4200, degree of saponification: 99.2 mol%) and acetoacetyl-modified PVA (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIRM") was mixed with 100 parts by weight of the PVA-based resin, and 13 parts by weight of potassium iodide was added and dissolved in water to prepare an aqueous PVA solution (coating solution). The PVA-based resin was applied to the corona-treated surface of the resin substrate and dried at 60°C to form a 13 μm-thick PVA-based resin layer, producing a laminate. The resulting laminate was uniaxially stretched 2.4 times in the longitudinal direction (longitudinal direction) in an oven at 130°C (in-air auxiliary stretching treatment). Next, the laminate was immersed for 30 seconds in an insolubilizing bath (a boric acid aqueous solution obtained by blending 4 parts by weight of boric acid with 100 parts by weight of water) at a liquid temperature of 40°C (insolubilization treatment), then immersed for 60 seconds in a dyeing bath (an iodine aqueous solution obtained by blending iodine and potassium iodide with 100 parts by weight of water in a weight ratio of 1:7) at a liquid temperature of 30°C while adjusting the concentration so that the single transmittance (Ts) of the finally obtained polarizer would be a desired value (dyeing treatment), then immersed for 30 seconds in a crosslinking bath (a boric acid aqueous solution obtained by blending 3 parts by weight of potassium iodide and 5 parts by weight of boric acid with 100 parts by weight of water) at a liquid temperature of 40°C (crosslinking treatment). The laminate was then 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 uniaxially stretched in the longitudinal direction (longitudinal direction) between rolls operating at different peripheral speeds to a total stretch ratio of 5.5 (underwater stretching treatment). The laminate was then immersed in a cleaning bath (an aqueous solution obtained by blending 4 parts by weight of potassium iodide with 100 parts by weight of water) at a liquid temperature of 20°C (washing treatment). The laminate was then dried in an oven maintained at approximately 90°C and brought into contact with a SUS heated roll maintained at a surface temperature of approximately 75°C (drying shrinkage treatment). In this manner, a polarizer having a thickness of approximately 5 μm was formed on the resin substrate.An acrylic resin film (manufactured by Kaneka Corporation, product name "HTX") (thickness = 40 μm) having a glutarimide structure as a protective layer was bonded to the surface of the obtained polarizer (the surface opposite to the resin substrate) via a UV-curable adhesive. Specifically, the curable adhesive was applied so that the total thickness was approximately 2.0 μm, and the films were bonded using a roller. Thereafter, UV light was irradiated from the acrylic resin film side to cure the adhesive. Next, the resin substrate was peeled off to obtain a polarized film having a thickness of 45 μm and a configuration of acrylic resin film (protective layer) / polarizer.

[0253] [Production Example 2]: Preparation of First Retardation Film A cyclic olefin film (manufactured by Zeon Corporation, product name "ZEONORFILM ZT12-50135") was used as the first retardation film. The thickness of the first retardation film was 18 μm. The photoelastic coefficient of the first retardation film was 1 × 10 -12 m 2 / N.

[0254] [Production Example 3]: Production of Second Retardation Film 48 parts by weight of hydroxypropyl methylcellulose (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: Metrose 60SH-50), 15,601 parts by weight of distilled water, 8,161 parts by weight of diisopropyl fumarate, 240 parts by weight of 3-ethyl-3-oxetanylmethyl acrylate, and 45 parts by weight of the polymerization initiator t-butyl peroxypivalate were placed in an autoclave equipped with a stirrer, cooling tube, nitrogen inlet tube, and thermometer. After nitrogen bubbling for 1 hour, the mixture was stirred at 49°C for 24 hours to carry out radical suspension polymerization. The mixture was then cooled to room temperature, and the suspension containing the resulting polymer particles was centrifuged. The resulting polymer was washed twice with distilled water and twice with methanol, and then dried under reduced pressure to obtain a white fumarate-based resin. The resulting fumarate-based resin was dissolved in methyl ethyl ketone to obtain a solution with a solids concentration of 20% by weight. Furthermore, 5 parts by weight of tributyl trimellitate was added as a plasticizer to 100 parts by weight of the fumaric acid ester resin to prepare a dope. A 75 μm-thick polyester film (biaxially stretched film of polyethylene-terephthalate / isophthalate copolymer) was used as the support film. The dope was applied to a film thickness of approximately 6 μm after drying and dried to obtain a laminate A in which a coating film of the fumaric acid ester resin was tightly laminated on the support. The obtained laminate A was uniaxially stretched at its free end to obtain a laminate B in which a second retardation film (positive B plate) having a refractive index anisotropy of nz > nx > ny was tightly laminated on the support. The support was peeled off from the laminate B to obtain a second retardation film (positive B plate) having a refractive index anisotropy of 6 μm. The photoelastic coefficient of the second retardation film was 5 × 10 -11 m 2 / N.

[0255] [Production Example 4] Preparation of first optical member (1a) An antireflection laminate was used as the first optical member (1a). As the antireflection laminate, an AR film (AR+HC thickness: 4 μm, substrate thickness: 80 μm, total thickness: 85 μm) manufactured by Dexerials Corporation was used.

[0256] [Manufacturing Example 5] Preparation of first optical member (1b) A polyester film having a thickness of 25 μm (manufactured by Toray Industries, Inc., product name "Lumirror #25-S10") was used as the first optical member (1b).

[0257] [Production Example 6] Preparation of first optical member (1c) A polyester film having a thickness of 75 μm (manufactured by Toray Industries, Inc., product name "Lumirror #75-S10") was used as the first optical member (1c).

[0258] [Production Example 7] Preparation of first optical member (1d) A polyester film having a thickness of 125 μm (manufactured by Toray Industries, Inc., product name "Lumirror #125-S10") was used as the first optical member (1d).

[0259] [Manufacturing Example 8] Preparation of second optical member (2) As the second optical member (2), an acrylic resin film having a glutarimide structure (manufactured by Kaneka Corporation, product name "HTX") (thickness = 40 μm) was used.

[0260] [Manufacturing Example 9] Preparation of third optical member (3) An anti-glare laminate was used as the third optical member (3). As the anti-glare laminate, a TAC film with a retardation film (product name "HL214", thickness = 42 μm) manufactured by Fujifilm Corporation was used.

[0261] [Production Example 10] Production of adhesive composition An adhesive composition was produced by mixing 100 parts by weight of an epoxy resin (manufactured by Mitsubishi Chemical Corporation, bisphenol A-type epoxy, product name "JER828") and 38 parts by weight of triethylenetetramine (TETA).

[0262] [Production Example 11] Production of Pressure-Sensitive Adhesive Composition (1) 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-methylpropionyl)benzyl)phenyl)-2-methylpropan-1-one (Omnirad 127D, manufactured by IGM Resins B.V.) as a photopolymerization initiator were placed in a four-neck flask and irradiated with ultraviolet light under a nitrogen atmosphere to obtain a partially photopolymerized monomer syrup (1). The ultraviolet light irradiation was 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. The resulting monomer syrup (1) was mixed with 0.10 parts by weight of 1,9-nonanediol diacrylate (NDDA) as a crosslinking agent to obtain a pressure-sensitive adhesive composition (1).

[0263] [Production Example 12] Production of Pressure-Sensitive Adhesive Composition (2) A pressure-sensitive adhesive composition (2) was obtained in the same manner as in Production Example 11, except that 0.90 parts by weight of urethane acrylate (manufactured by Daicel-Allnex Corporation, trade name "EBECRYL4859") was used as the crosslinking agent instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA).

[0264] [Production Example 13] Production of Pressure-Sensitive Adhesive Composition (3) A pressure-sensitive adhesive composition (3) was obtained in the same manner as in Production Example 11, except that 0.70 parts by weight of urethane acrylate (manufactured by Daicel-Allnex Corporation, trade name "EBECRYL4859") was used as the crosslinking agent instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA).

[0265] [Production Example 14] Production of Pressure-Sensitive Adhesive Composition (4) A pressure-sensitive adhesive composition (4) was obtained in the same manner as in Production Example 11, except that 1.00 parts by weight of urethane acrylate (manufactured by Daicel-Allnex Corporation, trade name "EBECRYL4859") was used as the crosslinking agent instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA).

[0266] [Production Example 15] Production of Pressure-Sensitive Adhesive Composition (5) A pressure-sensitive adhesive composition (5) was obtained in the same manner as in Production Example 11, except that 5.00 parts by weight of urethane acrylate (manufactured by Daicel-Allnex Corporation, trade name "EBECRYL4859") was used as the crosslinking agent instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA).

[0267] [Production Example 16] Production of adhesive composition (6) A pressure-sensitive adhesive composition (6) was obtained in the same manner as in Production Example 11, except that 0.50 parts by weight of urethane acrylate (manufactured by Daicel-Allnex Corporation, trade name "EBECRYL4859") was used as the crosslinking agent instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA).

[0268] [Production Example 17] Production of adhesive composition (7) A pressure-sensitive adhesive composition (7) was obtained in the same manner as in Production Example 11, except that 0.50 parts by weight of epoxy acrylate (manufactured by Daicel-Allnex Corporation, trade name "EBECRYL3700") was used as the crosslinking agent instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA).

[0269] [Production Example 18] Production of adhesive composition (8) A pressure-sensitive adhesive composition (8) was obtained in the same manner as in Production Example 11, except that 1.00 parts by weight of epoxy acrylate (manufactured by Daicel-Allnex Corporation, trade name "EBECRYL3700") was used as the crosslinking agent instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA).

[0270] [Production Example 19] Production of adhesive composition (9) A pressure-sensitive adhesive composition (9) was obtained in the same manner as in Production Example 11, except that 2.00 parts by weight of epoxy acrylate (manufactured by Daicel-Allnex Corporation, trade name "EBECRYL3700") was used as the crosslinking agent instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA).

[0271] [Production Example 20] Production of Pressure-Sensitive Adhesive Composition (10) A pressure-sensitive adhesive composition (10) was obtained in the same manner as in Production Example 11, except that 1.00 parts by weight of polyester acrylate (manufactured by IGM Resins B.V., trade name "PHOTOMER 5429") was used as the crosslinking agent instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA).

[0272] [Production Example 21] Production of Pressure-Sensitive Adhesive Composition (11) A pressure-sensitive adhesive composition (11) was obtained in the same manner as in Production Example 11, except that 0.50 parts by weight of polyester acrylate (manufactured by IGM Resins B.V., trade name "PHOTOMER 5429") was used as the crosslinking agent instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA).

[0273] [Production Example 22] Production of Pressure-Sensitive Adhesive Composition (12) A pressure-sensitive adhesive composition (12) was obtained in the same manner as in Production Example 11, except that 2.00 parts by weight of polyester acrylate (manufactured by IGM Resins B.V., trade name "PHOTOMER 5429") was used as the crosslinking agent instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA).

[0274] [Production Example 23] Production of Pressure-Sensitive Adhesive Composition (13) A pressure-sensitive adhesive composition (13) was obtained in the same manner as in Production Example 11, except that 0.50 parts by weight of di(trimethylolpropane)tetraacrylate (manufactured by IGM Resins B.V., trade name "PHOTOMER 4306") was used as the crosslinking agent instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA).

[0275] [Production Example 24] Production of Pressure-Sensitive Adhesive Composition (14) A pressure-sensitive adhesive composition (14) was obtained in the same manner as in Production Example 11, except that 2.00 parts by weight of di(trimethylolpropane)tetraacrylate (manufactured by IGM Resins B.V., trade name "PHOTOMER 4306") was used as the crosslinking agent instead of 0.1 parts by weight of 1,9-nonanediol diacrylate (NDDA).

[0276] [Production Example 25] Production of adhesive composition (15) 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 Corporation) as an amide group-containing monomer were mixed with the monomer syrup (1) obtained in Production Example 11 to obtain an adhesive composition (15).

[0277] [Production Example 26] Production of adhesive composition (16) A pressure-sensitive adhesive composition (16) was obtained in the same manner as in Production Example 25, except that 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) as the crosslinking agent.

[0278] [Production Example 27] Production of adhesive composition (17) A pressure-sensitive adhesive composition (17) was obtained in the same manner as in Production Example 11, except that 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) as the crosslinking agent.

[0279] [Production Example 28] Production of adhesive composition (18) 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 Corporation) as an amide group-containing monomer were mixed with the monomer syrup (1) obtained in Production Example 11 to obtain an adhesive composition (18).

[0280] [Production Example 29] Production of adhesive composition (19) A pressure-sensitive adhesive composition (19) was obtained in the same manner as in Production Example 25, except that 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) as the crosslinking agent.

[0281] [Production Example 30] Production of additive solution (1) Additive solution (1) was produced 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 B.V.) as a photopolymerization initiator, and 103 parts by weight of ethyl acetate as a solvent.

[0282] [Production Example 31] Production of PSA (A) Constituting the Second and Third PSA Layers

[0046] A four-neck flask equipped with a stirring blade, a thermometer, a nitrogen gas inlet tube, and a condenser was charged with 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). Furthermore, 0.1 parts by weight of 2,2'-azobisisobutyronitrile as a polymerization initiator and 100 parts by weight of ethyl acetate were charged to 100 parts by weight of this monomer mixture. Nitrogen gas was introduced with gentle stirring to replace the atmosphere, and the temperature in the flask was maintained at around 55°C for 8 hours to carry out a polymerization reaction, thereby preparing an acrylic polymer solution having a weight average molecular weight (Mw) of 2,200,000 and an Mw / Mn of 3.0.

[0123] 3 parts by weight of a trimethylolpropane / tolylene diisocyanate adduct (manufactured by Tosoh Corporation, trade name "Coronate L"), 0.2 parts by weight of a peroxide crosslinking agent (benzoyl peroxide), and 0.075 parts by weight of an epoxy group-containing silane coupling agent (manufactured by Shin-Etsu Chemical Co., Ltd., trade name "KBM-403") were blended with 100 parts by weight of the solid content of the obtained acrylic polymer solution to obtain a pressure-sensitive adhesive (A) constituting the second adhesive layer and the third adhesive layer.

[0283] [Production Example 32] Production of Release Liner A A silicone-based release agent composition was obtained by mixing 30 parts by weight of an addition reaction curable silicone (LTC761 containing a hexenyl group-containing polyorganosiloxane, a 30 wt% toluene solution, manufactured by Dow Corning Toray Co., Ltd.), 0.9 parts by weight of a release control agent (BY24-850 containing an unreactive silicone resin, manufactured by Dow Corning Toray Co., Ltd.), 2 parts by weight of a curing catalyst (SRX212 containing a platinum catalyst, manufactured by Dow Corning Toray Co., Ltd.), and a toluene / hexane mixed solvent (volume ratio 1:1) as a diluent. The silicone solids concentration in the silicone-based release agent composition was 1.0 wt%. Next, the silicone-based release agent composition was applied with a wire bar to one side of a liner substrate (Lumirror XD500P, a polyester film, 75 μm thick), and heated at 130°C for 1 minute to produce a release liner A having a release layer (thickness 60 nm) on one side.

[0284] [Production Example 33] Production of Release Liner B Release liner B, which had a release layer (thickness 120 nm) on one side, was produced in the same manner as release liner A, except that the thickness of the silicone-based release agent composition applied to the liner substrate was changed.

[0285] [Example 1] A laminate was produced by laminating the polarizing film obtained in Production Example 1 (acrylic resin film (protective layer) / polarizer), the first retardation film obtained in Production Example 2, and the second retardation film obtained in Production Example 3 in this order. The first retardation film was attached to the polarizer side of the polarizing film. Specifically, a UV-curable adhesive was used for attachment, and the films were attached so that the slow axis of the first retardation film was at an angle of 0° with respect to the absorption axis of the polarizer, and the slow axis of the second retardation film was at an angle of 90° with respect to the absorption axis of the polarizer. As a result, a laminate P1 having a laminate structure of "polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm)" was obtained. The third optical member (3) (anti-glare laminate) obtained in Production Example 9 was attached to the protective layer of the obtained laminate P1 via the pressure-sensitive adhesive (A) obtained in Production Example 31. Specifically, the pressure-sensitive adhesive (A) was applied to the viewing-side surface of the protective layer to form a 12 μm-thick third pressure-sensitive adhesive layer. The anti-glare layer (a layer containing a liquid crystal compound aligned and solidified) of the third optical member (3) was then contacted with the third pressure-sensitive adhesive layer, and the third optical member (3) was bonded to the polarizing film via the third pressure-sensitive adhesive layer. The slow axis of the anti-glare layer was adjusted to form a 45° angle with respect to the absorption axis of the polarizer. Next, the second optical member (2) (an acrylic resin film having a glutarimide structure as a reinforcing layer) was bonded to the second substrate of the third optical member (3) via the pressure-sensitive adhesive (A) obtained in Production Example 31. Specifically, the pressure-sensitive adhesive (A) was applied to the viewing-side surface of the second substrate to form a 12 μm-thick second pressure-sensitive adhesive layer, and the second optical member (2) was contacted with the second pressure-sensitive adhesive layer. As a result of the above, a laminate Q1 having a laminated structure of "second optical member (2) (thickness 40 μm) / second pressure-sensitive adhesive layer (thickness 12 μm) / third optical member (3) (thickness 42 μm) / third pressure-sensitive adhesive layer (thickness 12 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm)" was obtained. Separately, the pressure-sensitive adhesive composition (1) obtained in Production Example 11 was applied to the surface of the release layer of the release liner A obtained in Production Example 32 using an applicator to form a coating layer. Next, the release liner B obtained in Production Example 33 was placed on the formed coating layer to obtain a laminate A1.Release liner B was placed so that the release layer was in contact with the coating layer. Next, the laminate A1 was irradiated with light from the release liner A side at an illuminance of 9 mW / cm. 2 Conditions (integrated light amount 2700 mJ / cm 2 ) was irradiated with light. As a result, the coating layer was photocured, and a laminate B1 composed of release liner A / first pressure-sensitive adhesive layer (1) (thickness 12 μm) / release liner B was formed. An LED was used as the light source. The peak wavelength of the light irradiated by the LED was 340 nm. Next, release liner B was peeled from laminate B1, and the first optical member (1a) obtained in Production Example 4 was placed on the exposed surface of the first pressure-sensitive adhesive layer (1). In this way, a laminate R1 having a laminate structure of "release liner A / first pressure-sensitive adhesive layer (1) (thickness 12 μm) / first optical member (1a) (thickness 85 μm)" was obtained. Release liner A was peeled from laminate R1, and the exposed first pressure-sensitive adhesive layer (1) was transferred onto the second optical member (2) of laminate Q1. As a result of the above, a laminate having a laminated structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive adhesive layer (1) (thickness 12 μm) / second optical member (2) (thickness 40 μm) / second pressure-sensitive adhesive layer (thickness 12 μm) / third optical member (3) (thickness 42 μm) / third pressure-sensitive adhesive layer (thickness 12 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm)" was obtained. Next, the pressure-sensitive adhesive (A) obtained in Production Example 31 was applied to the surface opposite the first retardation film in the second retardation film to form a panel-side pressure-sensitive adhesive layer (thickness 15 μm). As a result of the above, an optical laminate (1) having a laminated structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive adhesive layer (1) (thickness 12 μm) / second optical member (2) (thickness 40 μm) / second pressure-sensitive adhesive layer (thickness 12 μm) / third optical member (3) (thickness 42 μm) / third pressure-sensitive adhesive layer (thickness 12 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel side pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminated structure is also shown in Table 2.

[0286] [Example 2] The adhesive composition obtained in Production Example 10 was applied to the protective layer of the laminate P1 obtained in Example 1 using an applicator to form a coating layer. Next, the first optical member (1a) obtained in Production Example 4 was placed on the formed coating layer and cured at 25 ° C. for 24 hours, forming a first adhesive layer (thickness 130 μm) between the laminate P1 and the first optical member (1a). As a result, a laminate having a laminated structure of "first optical member (1a) (thickness 85 μm) / first adhesive layer (thickness 130 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm)" was obtained. Next, the pressure-sensitive adhesive (A) obtained in Production Example 31 was applied to the surface of the second retardation film opposite the first retardation film to form a panel-side pressure-sensitive adhesive layer (thickness 15 μm). As a result of the above, an optical laminate (2) having a laminate structure of "first optical member (1a) (thickness 85 μm) / first adhesive layer (thickness 130 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel-side pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0287] [Example 3] A second optical member (2) (an acrylic resin film having a glutarimide structure as a reinforcing layer) was bonded to the protective layer of the laminate P1 obtained in Example 1 via the pressure-sensitive adhesive (A) obtained in Production Example 31. Specifically, the pressure-sensitive adhesive (A) was applied to the viewing side surface of the protective layer to form a second pressure-sensitive adhesive layer with a thickness of 12 μm, and the second optical member (2) was brought into contact with the second pressure-sensitive adhesive layer and bonded to the protective layer. As a result, a laminate Q3 having a laminate configuration of "second optical member (2) (thickness 40 μm) / second pressure-sensitive adhesive layer (thickness 12 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm)" was obtained. The release liner A was peeled from the laminate R1 obtained in Example 1 ("Release liner A / first pressure-sensitive adhesive layer (1) (thickness 12 μm) / first optical member (1a) (thickness 85 μm)"), and the exposed first pressure-sensitive adhesive layer (1) was transferred onto the second optical member (2) of the laminate Q3. As a result, a laminate having a laminated structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive adhesive layer (1) (thickness 12 μm) / second optical member (2) (thickness 40 μm) / second pressure-sensitive adhesive layer (thickness 12 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm)" was obtained. Next, the pressure-sensitive adhesive (A) obtained in Production Example 31 was applied to the surface of the second retardation film opposite the first retardation film to form a panel-side pressure-sensitive adhesive layer (thickness 15 μm). As a result of the above, an optical laminate (3) having a laminate structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive adhesive layer (1) (thickness 12 μm) / second optical member (2) (thickness 40 μm) / second pressure-sensitive adhesive layer (thickness 12 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel-side pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0288] [Example 4] The same procedure as in Example 2 was carried out, except that the thickness of the first adhesive layer was changed to 80 μm. As a result, an optical laminate (4) having a laminate structure of "first optical member (1a) (thickness 85 μm) / first adhesive layer (thickness 80 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel-side pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0289] Example 5 In the same manner as in Example 1, a laminate P1 having a laminated structure of "polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm)" was obtained. Separately, the pressure-sensitive adhesive composition (2) obtained in Production Example 12 was applied with an applicator to the surface of the release layer of the release liner A obtained in Production Example 32 to form a coating layer. Next, the release liner B obtained in Production Example 33 was placed on the formed coating layer to obtain a laminate A5. The release liner B was placed so that the release layer was in contact with the coating layer. Next, a luminance of 9 mW / cm was applied from the side of the release liner A in the laminate A5. 2 Conditions (integrated light amount 2700 mJ / cm 2) was irradiated with light. As a result, the coating layer was photocured, and a laminate B5 composed of release liner A / first pressure-sensitive adhesive layer (2) (thickness 100 μm) / release liner B was formed. An LED was used as the light source. The peak wavelength of the light irradiated from the LED was 340 nm. Next, release liner B was peeled from laminate B5, and the first optical member (1d) obtained in Production Example 7 was placed on the exposed surface of the first pressure-sensitive adhesive layer (2). In this way, a laminate R5 having a laminate structure of "release liner A / first pressure-sensitive adhesive layer (2) (thickness 100 μm) / first optical member (1d) (thickness 125 μm)" was obtained. Release liner A was peeled from laminate R5, and the exposed first pressure-sensitive adhesive layer (2) was transferred onto the protective layer of laminate P1 obtained in Example 1. As a result of the above, a laminate having a laminated structure of "first optical member (1d) (thickness 125 μm) / first pressure-sensitive adhesive layer (2) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm)" was obtained. Next, the pressure-sensitive adhesive (A) obtained in Production Example 31 was applied to the surface of the second retardation film opposite the first retardation film to form a panel-side pressure-sensitive adhesive layer (thickness 15 μm). As a result of the above, an optical laminate (5) having a laminated structure of "first optical member (1d) (thickness 125 μm) / first pressure-sensitive adhesive layer (2) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel-side pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0290] Example 6 In the same manner as in Example 1, a laminate P1 having a laminated structure of "polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm)" was obtained. Separately, the pressure-sensitive adhesive composition (7) obtained in Production Example 17 was applied with an applicator to the surface of the release layer of the release liner A obtained in Production Example 32 to form a coating layer. Next, the release liner B obtained in Production Example 33 was placed on the formed coating layer to obtain a laminate A6. The release liner B was placed so that the release layer was in contact with the coating layer. Next, a luminance of 9 mW / cm was applied from the side of the release liner A in the laminate A6. 2Conditions (integrated light amount 2700 mJ / cm 2 ) was irradiated with light. As a result, the coating layer was photocured, and a laminate B6 composed of release liner A / first pressure-sensitive adhesive layer (7) (thickness 100 μm) / release liner B was formed. An LED was used as the light source. The peak wavelength of the light irradiated from the LED was 340 nm. Next, release liner B was peeled from laminate B6, and the first optical member (1a) obtained in Production Example 4 was placed on the exposed surface of the first pressure-sensitive adhesive layer (7). In this way, a laminate R6 having a laminate structure of "release liner A / first pressure-sensitive adhesive layer (7) (thickness 100 μm) / first optical member (1a) (thickness 85 μm)" was obtained. Release liner A was peeled from laminate R6, and the exposed first pressure-sensitive adhesive layer (7) was transferred onto the protective layer of laminate P1 obtained in Example 1. As a result of the above, a laminate having a laminated structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive adhesive layer (7) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm)" was obtained. Next, the pressure-sensitive adhesive (A) obtained in Production Example 31 was applied to the surface of the second retardation film opposite the first retardation film to form a panel-side pressure-sensitive adhesive layer (thickness 15 μm). As a result of the above, an optical laminate (6) having a laminated structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive adhesive layer (7) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel-side pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminated structure is also shown in Table 2.

[0291] [Example 7] The same procedure as in Example 6 was carried out, except that the pressure-sensitive adhesive composition (2) obtained in Production Example 12 was used instead of the pressure-sensitive adhesive composition (7) obtained in Production Example 17. As a result, an optical laminate (7) having a laminate structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive adhesive layer (2) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel-side pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0292] [Example 8] The same procedure as in Example 6 was carried out, except that the pressure-sensitive adhesive composition (10) obtained in Production Example 20 was used instead of the pressure-sensitive adhesive composition (7) obtained in Production Example 17. As a result, an optical laminate (8) having a laminate structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive adhesive layer (10) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel-side pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0293] [Example 9] The same procedure as in Example 6 was carried out, except that the pressure-sensitive adhesive composition (8) obtained in Production Example 18 was used instead of the pressure-sensitive adhesive composition (7) obtained in Production Example 17. As a result, an optical laminate (9) having a laminate structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive adhesive layer (8) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel-side pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0294] [Example 10] The same procedure as in Example 6 was carried out, except that the pressure-sensitive adhesive composition (3) obtained in Production Example 13 was used instead of the pressure-sensitive adhesive composition (7) obtained in Production Example 17. As a result, an optical laminate (10) having a laminate structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive 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 pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0295] [Example 11] The same procedure as in Example 6 was carried out, except that the pressure-sensitive adhesive composition (11) obtained in Production Example 21 was used instead of the pressure-sensitive adhesive composition (7) obtained in Production Example 17. As a result, an optical laminate (11) having a laminate structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive 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 pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0296] [Example 12] The same procedure as in Example 6 was carried out, except that the pressure-sensitive adhesive composition (4) obtained in Production Example 14 was used instead of the pressure-sensitive adhesive composition (7) obtained in Production Example 17. As a result, an optical laminate (12) having a laminate structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive adhesive layer (4) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel-side pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0297] [Example 13] The same procedure as in Example 6 was carried out, except that the pressure-sensitive adhesive composition (13) obtained in Production Example 23 was used instead of the pressure-sensitive adhesive composition (7) obtained in Production Example 17. As a result, an optical laminate (13) having a laminate structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive 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 pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0298] [Example 14] The same procedure as in Example 6 was carried out, except that the pressure-sensitive adhesive composition (15) obtained in Production Example 25 was used instead of the pressure-sensitive adhesive composition (7) obtained in Production Example 17. As a result, an optical laminate (14) having a laminate structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive 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 pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0299] [Example 15] The same procedure as in Example 6 was carried out, except that the pressure-sensitive adhesive composition (16) obtained in Production Example 26 was used instead of the pressure-sensitive adhesive composition (7) obtained in Production Example 17. As a result, an optical laminate (15) having a laminate structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive 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 pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0300] Example 16 In the same manner as in Example 1, a laminate P1 having a laminated structure of "polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm)" was obtained. Separately, the pressure-sensitive adhesive composition (17) obtained in Production Example 27 was applied with 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, to form 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 to the coating layer formed on the first release liner. Next, an illuminance of 9 mW / cm was applied to the coating layer between the release liners from the first release liner side. 2 Conditions (integrated light amount 2700 mJ / cm 2) was irradiated with light. This photocured the coating layer, forming a laminate composed of the first release liner, the first pressure-sensitive adhesive layer precursor (17) (thickness: 80 μm), and the second release liner. An LED was used as the light source. The peak wavelength of the light irradiated by the LED was 340 nm. Next, the second release liner was peeled off from the resulting laminate, and the additive solution (1) obtained in Production Example 30 was applied to the exposed surface of the first pressure-sensitive adhesive layer precursor (17). The amount of additive solution (1) applied was determined so that the total amount of additives in the additive solution (1) was 20 parts by weight relative to 80 parts by weight of the pressure-sensitive adhesive composition (17) used to form the first pressure-sensitive adhesive layer precursor (17), resulting in a coating thickness of approximately 50 μm. A bar coater RDS No. 30 manufactured by R.D. SPECIALTIES was used for application. Next, the laminate was dried in a dryer at 110°C for 3 minutes. The coating and drying processes allowed the additive components to penetrate into the first pressure-sensitive adhesive layer precursor (17), and also vaporized the solvent. The penetration of the additive components transformed the first pressure-sensitive adhesive layer precursor (17) into a photocurable first pressure-sensitive adhesive layer precursor (17a). Next, the release-treated surface of a third release liner (trade name "Diafoil MRE", thickness 75 μm, manufactured by Mitsubishi Chemical Corporation), which had a release-treated surface on one side, was attached to the photocurable first pressure-sensitive adhesive layer precursor (17a) on the first release liner. Next, a black light (manufactured by Toshiba Corporation, wavelength 320 nm to 400 nm, illuminance 2.5 mW / cm) was applied to the photocurable first pressure-sensitive adhesive layer precursor (17a) between the release liners from the first release liner side. 2 , cumulative light intensity 2400 mJ / cm 2) was irradiated with light. As a result, the photocurable first pressure-sensitive adhesive layer precursor (17a) was photocured, and a laminate B16 composed of first release liner / first pressure-sensitive adhesive layer (17a) (thickness 100 μm) / third release liner was formed. Next, the third release liner was peeled from laminate B16, and the first optical member (1a) obtained in Production Example 4 was placed on the exposed surface of the first pressure-sensitive adhesive layer (17a). In this way, a laminate R16 having a laminate structure of "first release liner / first pressure-sensitive adhesive layer (17a) (thickness 100 μm) / first optical member (1a) (thickness 85 μm)" was obtained. The first release liner was peeled from laminate R16, and the exposed first pressure-sensitive adhesive layer (17a) was transferred onto the protective layer of laminate P1 obtained in Example 1. As a result of the above, a laminate having a laminated structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive adhesive layer (17a) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm)" was obtained. Next, the pressure-sensitive adhesive (A) obtained in Production Example 31 was applied to the surface of the second retardation film opposite the first retardation film to form a panel-side pressure-sensitive adhesive layer (thickness 15 μm). As a result of the above, an optical laminate (16) having a laminated structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive adhesive layer (17a) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel-side pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminated structure is also shown in Table 2.

[0301] Example 17 A laminate composed of a first release liner, a first pressure-sensitive adhesive layer precursor (18) (thickness: 90 μm), and a second release liner was formed in the same manner as in Example 16, except that the pressure-sensitive adhesive composition (17) obtained in Production Example 27 was replaced with the pressure-sensitive adhesive composition (18) obtained in Production Example 28. The second release liner was then peeled from the resulting laminate, and the additive solution (1) obtained in Production Example 30 was applied to the exposed surface of the first pressure-sensitive adhesive layer precursor (18). The amount of additive solution (1) applied was determined so that the total amount of additives in the additive solution (1) was 10 parts by weight relative to 90 parts by weight of the pressure-sensitive adhesive composition (18) used to form the first pressure-sensitive adhesive layer precursor (18), resulting in a coating thickness of approximately 25 μm. A bar coater RDS No. 30 manufactured by R.D. SPECIALTIES was used for application. The laminate was then dried in a dryer at 110°C for 3 minutes. The coating and drying processes allowed the additive components to penetrate into the first pressure-sensitive adhesive layer precursor (18), and the solvent was evaporated. The first pressure-sensitive adhesive layer precursor (18) was converted into a photocurable first pressure-sensitive adhesive layer precursor (18a) by the penetration of the additive components. Thereafter, the same procedure as in Example 16 was carried out to obtain an optical laminate (17) having a laminate structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive adhesive layer (18a) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel-side pressure-sensitive adhesive layer (thickness 15 μm)". The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0302] [Example 18] The thickness of the first pressure-sensitive adhesive layer precursor (18) was changed from 90 μm to 80 μm, and the coating amount of the additive solution (1) was determined so that the total amount of additives in the additive solution (1) was 20 parts by weight relative to 80 parts by weight of the pressure-sensitive adhesive composition (18) used to form the first pressure-sensitive adhesive layer precursor (18). Except for this, the same procedure as in Example 17 was carried out, with the exception of a coating thickness of approximately 50 μm. An optical laminate (18) having a laminate structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive 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 pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0303] [Example 19] The same procedure as in Example 17 was carried out except that the pressure-sensitive adhesive composition (19) obtained in Production Example 29 was used instead of the pressure-sensitive adhesive composition (18) obtained in Production Example 28. An optical laminate (19) having a laminate structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive 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 pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0304] [Example 20] The same procedure as in Example 18 was carried out except that the pressure-sensitive adhesive composition (19) obtained in Production Example 29 was used instead of the pressure-sensitive adhesive composition (18) obtained in Production Example 28. An optical laminate (20) having a laminate structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive 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 pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0305] [Comparative Example 1] The same procedure as in Example 6 was carried out, except that the pressure-sensitive adhesive composition (9) obtained in Production Example 19 was used instead of the pressure-sensitive adhesive composition (7) obtained in Production Example 17. As a result, an optical laminate (C1) having a laminate structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive adhesive layer (9) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel-side pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0306] [Comparative Example 2] The same procedure as in Example 6 was carried out, except that the pressure-sensitive adhesive composition (12) obtained in Production Example 22 was used instead of the pressure-sensitive adhesive composition (7) obtained in Production Example 17. As a result, an optical laminate (C2) having a laminate structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive adhesive layer (12) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel-side pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0307] [Comparative Example 3] The same procedure as in Example 6 was carried out, except that the pressure-sensitive adhesive composition (5) obtained in Production Example 15 was used instead of the pressure-sensitive adhesive composition (7) obtained in Production Example 17. As a result, an optical laminate (C3) having a laminate structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive adhesive layer (5) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel-side pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0308] [Comparative Example 4] The same procedure as in Example 6 was carried out, except that the pressure-sensitive adhesive composition (14) obtained in Production Example 24 was used instead of the pressure-sensitive adhesive composition (7) obtained in Production Example 17. As a result, an optical laminate (C4) having a laminate structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive adhesive layer (14) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel-side pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0309] [Comparative Example 5] The same procedure as in Example 6 was carried out, except that the pressure-sensitive adhesive composition (6) obtained in Production Example 16 was used instead of the pressure-sensitive adhesive composition (7) obtained in Production Example 17. As a result, an optical laminate (C5) having a laminate structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive adhesive layer (6) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel-side pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0310] [Comparative Example 6] The same procedure as in Example 6 was carried out, except that the pressure-sensitive adhesive composition (1) obtained in Production Example 11 was used instead of the pressure-sensitive adhesive composition (7) obtained in Production Example 17. As a result, an optical laminate (C6) having a laminate structure of "first optical member (1a) (thickness 85 μm) / first pressure-sensitive adhesive layer (1) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel-side pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0311] [Comparative Example 7] The same procedure as in Example 5 was carried out, except that the first optical member (1c) obtained in Production Example 6 was used instead of the first optical member (1d) obtained in Production Example 7. As a result, an optical laminate (C7) having a laminate structure of "first optical member (1c) (thickness 75 μm) / first pressure-sensitive adhesive layer (2) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel-side pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0312] [Comparative Example 8] The same procedure as in Example 5 was carried out, except that the first optical member (1b) obtained in Production Example 5 was used instead of the first optical member (1d) obtained in Production Example 7. As a result, an optical laminate (C8) having a laminate structure of "first optical member (1b) (thickness 25 μm) / first pressure-sensitive adhesive layer (2) (thickness 100 μm) / polarizing film (thickness 45 μm) / first retardation film (thickness 18 μm) / second retardation film (thickness 6 μm) / panel-side pressure-sensitive adhesive layer (thickness 15 μm)" was obtained. The results are shown in Table 1. The laminate structure is also shown in Table 2.

[0313]

[0314]

[0315] The optical laminate according to the embodiment of the present invention can be suitably 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 a pressure-sensitive adhesive layer, wherein a puncture test is performed using a puncture jig with a tip curvature radius R of 550 μm, and the load after reaching the maximum load Fp (kgf) and maintaining it for 15 seconds is defined as F (kgf), the amount of displacement when the maximum load Fp (kgf) is reached is defined as L (μm), and the total thickness of the optical laminate is defined as T (μm), where the residual stress attenuation rate ΔF (%) calculated by formula (1) and the maximum strain rate ΔL (%) calculated by formula (2) satisfy at least one of ΔF≦42 and ΔL<80. Formula (1): ΔF=[(Fp-F) / Fp]×100 Formula (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, further comprising a first optical member bonded to the viewing side of the polarizing film via a first adhesive layer.

4. The optical laminate according to claim 1, comprising a second optical element bonded to the viewing side of the polarizing film via a second adhesive layer, and a first optical element bonded to the viewing side of the second optical element via a first adhesive layer.

5. The optical laminate according to claim 1, comprising: a third optical element bonded to the viewing side of the polarizing film via a third adhesive layer; a second optical element bonded to the viewing side of the third optical element via a second adhesive layer; and a first optical element bonded to the viewing side of the second optical element via a first adhesive layer.

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

Images