Optical laminate, transfer laminate, polarizing plate, display panel, and image display device

Abstract

The present invention provides an optical laminate comprising a positive A-layer and an orientation layer-cum-UV absorption layer directly in contact with the positive A-layer, wherein the optical laminate has a transmittance of 1.0% or less at a wavelength of 380 nm and a transmittance of 20.0% or less at a wavelength of 400 nm, and the orientation layer-cum-UV absorption layer includes a region where a liquid-crystalline component included in the positive A-layer has infiltrated at the interface on the positive A-layer side.

Description

Optical laminate, transfer laminate, polarizing plate, display panel, and image display device

[0001] The present disclosure relates to an optical laminate, a transfer laminate, a polarizing plate, a display panel, and an image display device in which an alignment layer / ultraviolet absorbing layer having the functions of both an alignment layer and an ultraviolet absorbing layer in one layer is in direct contact with a positive A layer.

[0002] As an optical laminate applied to image display devices and the like, there is a retardation plate that imparts a desired phase difference to incident light using a retardation layer. For example, in an organic electroluminescence (organic EL) display device, a quarter-wave retardation plate is used as a circular polarizer in combination with a linear polarizer, and functions as an external light antireflection film. Furthermore, in a liquid crystal display device such as an IPS mode, a retardation plate that combines a positive A layer having positive A characteristics and a positive C layer having positive C characteristics is used as part of a polarizing plate compensation film in order to increase the contrast when viewed from an oblique direction.

[0003] On the other hand, optical laminates used in image display devices and the like are required to have an ultraviolet absorbing function in order to block blue light, prevent eye damage, and improve the light resistance of the optical laminate. Conventionally, an ultraviolet absorbing layer has been laminated via an adhesive layer as a separate layer from a retardation layer such as a positive A layer or an alignment layer (see, for example, Patent Document 1). As display devices become thinner, optical laminates such as retardation plates are also required to have a configuration that allows for further thinning while maintaining performance, and to have an efficient manufacturing process.

[0004] It is described that an ultraviolet absorber may be added as an additive selected appropriately in the composition for alignment film. However, it is also described that an additive such as an ultraviolet absorber can be added to the extent that it does not significantly reduce the alignment ability of liquid crystal (for example, Patent Document 2). Patent Document 3 describes an optical laminate comprising a positive A layer and an ultraviolet absorbing layer in contact with the positive A layer, the ultraviolet absorbing layer being an alignment layer for the positive A layer.

[0005] Japanese Patent No. 7259232 Japanese Patent No. 5504601 Japanese Patent Application Laid-Open No. 2021-189224

[0006] In order to impart excellent UV absorption function to an optical laminate, if a UV absorbing layer is laminated as a separate layer to form an optical laminate such as a UV absorbing layer / adhesive layer / alignment layer / positive A layer, there are limitations to thinning the film, the number of steps increases, resulting in low productivity, and problems such as poor adhesion of the optical laminate and poor adhesion under high humidity and temperature conditions (hereinafter referred to as "humid heat adhesion"). Poor adhesion and humid heat adhesion can lead to problems such as peeling due to environmental changes in the production line where the optical laminate and polarizer are bonded, or when the image display device is placed in a high humidity environment. On the other hand, the amount of UV absorber added in the alignment layer of the thin film for the positive A layer in Patent Document 3 is small, which is insufficient for the UV absorption function of the optical laminate. Furthermore, improvements in the adhesion and humid heat adhesion of optical laminates are also desired.

[0007] The present disclosure has been made in consideration of the above problems, and a first object thereof is to provide an optical laminate, a transfer laminate, a polarizing plate, a display panel, and an image display device that have excellent UV absorption ability while improving adhesion and adhesion under moist heat, and that contribute to thinning and improved productivity. The present disclosure has been made in consideration of the above problems, and a second object thereof is to provide an optical laminate, a transfer laminate, a polarizing plate, a display panel, and an image display device that have excellent UV absorption ability and excellent adhesion under moist heat, and that contribute to thinning and improved productivity.

[0008] To achieve the first object, the present disclosure includes the following first aspects [1] to

[15] . [1] An optical laminate including a positive A layer and an alignment layer / ultraviolet absorbing layer in direct contact with the positive A layer, wherein the optical laminate has a transmittance of 1.0% or less at a wavelength of 380 nm and a transmittance of 20.0% or less at a wavelength of 400 nm, and the alignment layer / ultraviolet absorbing layer includes, at the interface on the positive A layer side, a region into which a liquid crystalline component contained in the positive A layer has permeated. [2] The optical laminate according to [1], wherein, in the thickness direction of the alignment layer / ultraviolet absorbing layer, a photo-alignable component is present in a relatively larger amount at the interface on the positive A layer side compared to a surface on the side not in contact with the positive A layer. [3] The optical laminate according to [1] or [2], wherein the alignment layer / ultraviolet absorbing layer satisfies the following formula (A) when analyzed by time-of-flight secondary ion mass spectrometry (TOF-SIMS): Formula (A): I ＡＵ >1.3 x I ＳＵ (In formula (A), I ＡＵ represents the secondary ion intensity derived from the photoalignment component detected at a position 100 nm from the interface of the alignment layer / ultraviolet absorbing layer on the positive A layer side in the thickness direction toward the alignment layer / ultraviolet absorbing layer. ＳＵrepresents the secondary ion intensity derived from the photo-alignment component detected at a position 100 nm toward the alignment layer / ultraviolet absorbing layer in the thickness direction from the surface of the alignment layer / ultraviolet absorbing layer that is not in contact with the positive A layer.) In this specification, the "secondary ion intensity derived from the photo-alignment component" detected by TOF-SIMS refers to the intensity of fragment ions derived from the photo-alignment component. [4] The optical laminate according to any one of [1] to [3], wherein the composite elastic modulus of the surface of the alignment layer / ultraviolet absorbing layer that is not in contact with the positive A layer is 3.0 GPa or more and 6.5 GPa or less. [5] The optical laminate according to any one of [1] to [4], wherein the surface free energy of the interface of the alignment layer / ultraviolet absorbing layer on the positive A layer side is lower than the surface free energy of the surface of the alignment layer / ultraviolet absorbing layer that is not in contact with the positive A layer. [6] A transfer laminate for use in transferring the positive A layer and the alignment layer / ultraviolet absorbing layer, comprising a support supporting the positive A layer and the alignment layer / ultraviolet absorbing layer in a peelable manner on the alignment layer / ultraviolet absorbing layer side of the optical laminate described in any one of [1] to [5] above. [7] A polarizing plate comprising the optical laminate described in any one of [1] to [5] above and a polarizer. [8] A polarizing plate comprising a polarizer and the optical laminate described in any one of [1] to [5] above as a transparent protective plate located on at least one side of the polarizer. [9] A display panel comprising the optical laminate described in any one of [1] to [5] above on a light-emitting surface of a display element.

[10] The display panel described in [9] above, in which the alignment layer / ultraviolet absorbing layer is located farther from the display element than the positive A layer.

[11] A display panel comprising the polarizing plate described in [8] above on a light-emitting surface of a display element.

[12] The display panel according to

[11] , wherein the optical laminate is located farther from the display element than the polarizer.

[13] The display panel according to

[11] , wherein the polarizer is located farther from the display element than the optical laminate.

[14] The display panel according to

[11] , wherein the optical laminate is located farther from the display element than the polarizer, and comprises the optical laminate or a positive A layer according to any one of [1] to [5] on the opposite side of the optical laminate with respect to the polarizer.

[15] An image display device comprising the display panel according to any one of [9] to

[14] .

[0009] To achieve the second object, the present disclosure includes the following second aspects

[16] to

[30] .

[16] An optical laminate comprising a positive A layer and an alignment layer / ultraviolet absorbing layer in direct contact with the positive A layer, wherein the optical laminate has a transmittance of 1.0% or less at a wavelength of 380 nm and a transmittance of 20.0% or less at a wavelength of 400 nm, and satisfies the following condition (1): Condition (1): The change in in-plane retardation ΔRe at a wavelength of 550 nm of the laminate of the positive A layer and the alignment layer / ultraviolet absorbing layer in direct contact with the positive A layer before and after a moist heat resistance test (temperature 60°C, relative humidity 95%, 500 hours) is 3.0 nm or less.

[17] The optical laminate according to

[16] above, further satisfies the following condition (2). Condition (2): After a moist heat resistance test (temperature 60°C, relative humidity 95%, 500 hours) of a laminate of a positive A layer and an alignment layer / ultraviolet absorbing layer directly in contact with the positive A layer, the adhesion between the positive A layer and the alignment layer / ultraviolet absorbing layer is evaluated by the following adhesion test, and the number of cross-cut portions in the grid pattern that do not peel off is 95% or more. (Adhesion Test) In JIS K5600-5-6:1999, except that the number of cuts in step 7.1.3 was changed from 6 to 11 and the tape peeling in step 7.2.6 was changed to be repeated 5 times using new tape each time, 11 cuts were made in each direction of the grid pattern from the alignment layer / ultraviolet absorbing layer side to the positive A layer, and the adhesion between the positive A layer and the alignment layer / ultraviolet absorbing layer was evaluated under the conditions of 1 mm cut intervals.

[18] The optical laminate according to any one of

[16] to

[17] , wherein the ultraviolet absorber contained in the alignment film / ultraviolet absorbing layer is an ultraviolet absorbing polymer.

[19] The optical laminate according to any one of

[16] to

[18] , wherein, in the thickness direction of the alignment layer / ultraviolet absorbing layer, a photo-alignment component is present in a relatively larger amount at the interface on the positive A layer side compared to the surface on the side not in contact with the positive A layer.

[20] The optical laminate according to any one of

[16] to

[19] , wherein, when the alignment layer / ultraviolet absorbing layer is analyzed by time-of-flight secondary ion mass spectrometry (TOF-SIMS), the following formula (A) is satisfied: Formula (A): I ＡＵ>1.3 x I ＳＵ (In formula (A), I ＡＵ represents the secondary ion intensity derived from the photoalignment component detected at a position 100 nm from the interface of the alignment layer / ultraviolet absorbing layer on the positive A layer side in the thickness direction toward the alignment layer / ultraviolet absorbing layer. ＳＵ represents the secondary ion intensity derived from a photo-alignment component detected at a position 100 nm from the surface of the alignment layer / ultraviolet absorbing layer that is not in contact with the positive A layer in the thickness direction toward the alignment layer / ultraviolet absorbing layer.)

[21] A transfer laminate for use in transferring the positive A layer and the alignment layer / ultraviolet absorbing layer, comprising a support that supports the positive A layer and the alignment layer / ultraviolet absorbing layer in a peelable manner, on the alignment layer / ultraviolet absorbing layer side of the optical laminate of any one of

[16] to

[20] above.

[22] A polarizing plate comprising the optical laminate of any one of

[16] to

[20] above and a polarizer.

[23] A polarizing plate comprising a polarizer and the optical laminate of any one of

[16] to

[20] above as a transparent protective plate located on at least one side of the polarizer.

[24] A display panel comprising the optical laminate of any one of

[16] to

[20] above on a light-emitting surface of a display element.

[25] The display panel according to

[24] , wherein the alignment layer / ultraviolet absorbing layer is located farther from the display element than the positive A layer.

[26] A display panel comprising the polarizing plate according to

[23] on the light exit surface of a display element.

[27] The display panel according to

[26] , wherein the optical laminate is located farther from the display element than the polarizer.

[28] The display panel according to

[26] , wherein the polarizer is located farther from the display element than the optical laminate.

[29] The display panel according to

[26] , wherein the optical laminate is located farther from the display element than the polarizer, and comprises the optical laminate or positive A layer according to any one of

[16] to

[20] on the opposite side of the optical laminate with respect to the polarizer.

[30] An image display device comprising the display panel according to any one of

[24] to

[29] .

[0010] The first present disclosure has the effect of providing an optical laminate, a transfer laminate, a polarizing plate, a display panel, and an image display device that have excellent UV absorption ability while improving adhesion and adhesion under moist heat, and that contribute to thinning and improved productivity.The second present disclosure has the effect of providing an optical laminate, a transfer laminate, a polarizing plate, a display panel, and an image display device that have excellent UV absorption ability and excellent adhesion under moist heat, and that contribute to thinning and improved productivity.

[0011] FIG. 1 is a schematic cross-sectional view showing an example of an optical laminate according to the present disclosure. FIG. 1 is a schematic cross-sectional view showing an example of an optical laminate according to the present disclosure. FIG. 2 is a schematic view showing the preparation of a sample in an optical laminate according to the present disclosure, cut obliquely from the surface of the positive A layer to the surface of the alignment layer and ultraviolet absorbing layer not in contact with the positive A layer. FIG. 1 is a schematic cross-sectional view showing an example of a transfer laminate according to the present disclosure. FIG. 2 is a schematic cross-sectional view showing an example of a polarizing plate according to the present disclosure. FIG. 3 is a schematic cross-sectional view showing another example of a polarizing plate according to the present disclosure. FIG. 4 is a schematic cross-sectional view showing another example of a polarizing plate according to the present disclosure. FIG. 5 is a schematic cross-sectional view showing another example of a polarizing plate according to the present disclosure. FIG. 6 is a schematic cross-sectional view showing another example of a display panel according to the present disclosure. FIG. 7 is a schematic cross-sectional view showing another example of a display panel according to the present disclosure. FIG. 8 is a schematic cross-sectional view showing another example of a display panel according to the present disclosure. FIG. 9 is a schematic cross-sectional view showing another example of a display panel according to the present disclosure. 1 is a schematic diagram illustrating the preparation of a sample in an optical laminate according to the second present disclosure, cut obliquely from the surface of the positive A layer to the surface of the alignment layer / ultraviolet absorbing layer on the side not in contact with the positive A layer. FIG. 2 is a schematic cross-sectional view illustrating an example of a transfer laminate according to the second present disclosure. FIG. 3 is a schematic cross-sectional view illustrating an example of a polarizing plate according to the second present disclosure. FIG. 4 is a schematic cross-sectional view illustrating another example of a polarizing plate according to the second present disclosure.

[0012] Hereinafter, embodiments and examples of the present disclosure will be described with reference to the drawings. However, the present disclosure can be implemented in many different forms, and should not be construed as being limited to the following exemplary embodiments and examples. Furthermore, for clarity of explanation, the drawings may schematically depict the width, thickness, shape, etc. of each part compared to the actual form. However, these are merely examples and do not limit the interpretation of the present disclosure. Furthermore, in this specification and each drawing, elements similar to those previously described with reference to the previous drawings may be denoted by the same reference numerals, and detailed descriptions may be omitted as appropriate. For convenience of explanation, the terms "above" and "below" may be used in some cases, but the up-down direction may be reversed. In this specification, when a certain component, such as a certain member or region, is described as being "above (or below)" another component, such as another member or region, unless otherwise specified, this includes not only the case where the component is directly above (or below) the other component, but also the case where the component is above (or below) the other component, i.e., the case where another component is present above (or below) the other component.

[0013] In this disclosure, (meth)acrylic refers to either acrylic or methacrylic, and (meth)acrylate refers to either acrylate or methacrylate. In this specification, the terms "plate," "sheet," and "film" are not distinguished from one another solely based on the difference in designation. A "film surface (plate surface, sheet surface)" refers to the surface that coincides with the planar direction of the target film-like (plate-like, sheet-like) member when viewed from an overall and global perspective. In this disclosure, the "to" symbol indicating a numerical range is used to mean that the numerical values ​​before and after it are included as the lower and upper limits. In this disclosure, an "alignment layer / UV-absorbing layer" refers to a layer that exhibits a predetermined UV-absorbing ability and also has the ability to align a liquid crystal material directly laminated thereon, and can be rephrased as a "UV-absorbing layer with liquid crystal alignment ability." In this disclosure, an "alignment layer / UV-absorbing layer" refers to a UV-absorbing layer that functions as both an alignment layer and an alignment layer, and can be rephrased as a "UV-absorbing layer that functions as an alignment layer."

[0014] In the present disclosure, "in-plane retardation at a wavelength of λ nm" may be expressed as "Re(λ)," and "out-of-plane (thickness direction) retardation at a wavelength of λ nm" may be expressed as "Rth(λ)." Unless otherwise specified, the wavelength λ is 550 nm. The in-plane retardation (Re) and out-of-plane retardation (Rth) can be calculated from Nx, Ny, Nz and the thickness d (nm) of the retardation layer by the following formulas: In-plane retardation (Re) = (Nx - Ny) × d Out-of-plane retardation (Rth) = ((Nx + Ny) / 2 - Nz) × d In the present disclosure, the in-plane retardation (Re) and out-of-plane retardation (Rth) of the optical laminate or the retardation layer are values ​​measured at a wavelength λ using a retardation measuring device (KOBRA-WR, manufactured by Oji Scientific Instruments Co., Ltd.). When measuring in-plane retardation (Re) using KOBRA-WR, measurements are performed according to the following (A1) to (A2). (A1) First, to stabilize the KOBRA-WR light source, leave it on for 60 minutes or more after turning on the light source. Then, select waveplate measurement and obtain data for the reference analyzer. (A2) Utilizing the incidence angle dependency (single N calculation), measurements are performed under the following measurement conditions: (Measurement conditions) Measurement mode: Standard Tilt central angle: Fast axis Incident angle: 0° Number of average measurements: 3 Average refractive index of the layer to be measured: Input the measured value (average refractive index) measured in accordance with JIS K7142 using an Abbe refractometer (manufactured by Atago Co., Ltd.) with sodium D line (589 nm) as the light source Thickness: Thickness measured with a scanning transmission electron microscope (STEM) In the present disclosure, the refractive indices Nx, Ny, and Nz are measured using an Abbe refractometer (manufactured by Atago Co., Ltd., NAR-4T) and a sodium lamp (λ = 589 nm) as the light source. In addition, when measuring wavelength dependency, measurements are performed using a multi-wavelength Abbe refractometer (manufactured by Atago Co., Ltd., DR-M2) in combination with an interference filter.

[0015] In the present disclosure, a positive A layer is a layer that satisfies the relationship Nx > Ny ≒ Nz, where Nx is the refractive index in the X-axis direction, which is the axial direction with the highest refractive index along the plane of the layer, Ny is the refractive index in the Y-axis direction perpendicular to the X-axis along the plane of the layer, and Nz is the refractive index in the thickness direction of the layer. Note that the term "≒" encompasses not only cases where the two are completely identical, but also cases where the two are substantially identical. "Substantially identical" also includes cases where (Ny - Nz) x d (where d is the film thickness) is -8 nm to 8 nm, as defined as "Ny ≒ Nz." (Ny - Nz) x d is preferably -5 nm to 5 nm. In the present disclosure, a positive C layer is a layer that satisfies the relationship Nx ≒ Ny < Nz. Note that the term "≒" encompasses not only cases where the two are completely identical, but also cases where the two are substantially identical. The term "substantially the same" means that "Nx≈Ny" also includes cases where (Nx-Ny)xd (where d is the film thickness) is 0 nm to 3 nm. (Nx-Ny)xd is preferably 0 nm to 2 nm.

[0016] I. First Present Disclosure I-A. Optical Laminate The present disclosure provides an optical laminate including a positive A layer and an alignment layer / ultraviolet absorbing layer in direct contact with the positive A layer, wherein the optical laminate has a transmittance of 1.0% or less at a wavelength of 380 nm and a transmittance of 20.0% or less at a wavelength of 400 nm, and the alignment layer / ultraviolet absorbing layer includes, at the interface on the positive A layer side, a region into which a liquid crystalline component contained in the positive A layer has permeated.

[0017] 1 and 2 are schematic cross-sectional views showing an example of an optical laminate of the present disclosure. The optical laminate 10 shown in FIG. 1 includes a positive A layer 2 and an alignment layer / ultraviolet absorbing layer 1 that is in direct contact with the positive A layer 2, and the alignment layer / ultraviolet absorbing layer 1 includes a region 3 where the liquid crystalline component contained in the positive A layer has permeated (hereinafter, may be referred to as a "permeation region"). The optical laminate of the present disclosure may further include a substrate. The optical laminate 10 shown in FIG. 2 includes a substrate 4, an alignment layer / ultraviolet absorbing layer 1 that is in direct contact with the substrate, and a positive A layer 2 that is in direct contact with the alignment layer / ultraviolet absorbing layer 1, and the alignment layer / ultraviolet absorbing layer 1 includes a region 3 where the liquid crystalline component contained in the positive A layer has permeated.

[0018] In one embodiment of the optical laminate, an alignment layer / ultraviolet absorbing layer 1, a positive A layer 2, and another functional layer may be laminated in this order. The alignment layer / ultraviolet absorbing layer 1 and the positive A layer 2 may be laminated to another positive C layer or positive A layer, for example, via an adhesive (not shown). Furthermore, in the optical laminate of the present disclosure, since the thickness after production can be reduced, the substrate 4 may be peeled off after production, so that the substrate does not need to be included as shown in FIG. 1.

[0019] Whether or not a region in the alignment layer / ultraviolet absorbing layer 1 where the liquid crystalline component contained in the positive A layer has permeated is determined by etching from the surface of the positive A layer in the thickness direction with a gas cluster ion beam, while measuring the layer thickness direction distribution of fragment ions derived from the liquid crystalline component derived from the positive A layer and fragment ions derived from the photo-alignment component contained in the alignment layer / ultraviolet absorbing layer using time-of-flight secondary ion mass spectrometry (TOF-SIMS). The layer thickness direction distribution is analyzed by repeating a series of operations: first, a surface depth region of 1 nm to 2 nm is analyzed, then a gas cluster ion beam is used to dig 10 nm in the thickness direction, and then a next surface depth region of 1 nm to 2 nm is analyzed. Based on the results of the layer thickness measurement using STEM, the repeated operation is initiated after digging from the surface of the positive A layer to 80% of the layer thickness. If there is a portion in the layer thickness direction distribution where both fragment ions derived from the liquid crystalline component derived from the positive A layer and fragment ions derived from the photo-alignment component contained in the alignment layer / ultraviolet absorbing layer are detected, it is determined that a region in which the liquid crystalline component has permeated exists. More specifically, while etching with an argon gas cluster ion beam (Ar-GCIB) gun (15 kV, 2.5 nA, 500 × 500 μm), primary ions were irradiated with Bi ３ ＋＋ Time-of-flight secondary ion mass spectrometry is performed at an acceleration voltage of 30 kV. Using the thickness measurement results of the positive A layer and the alignment layer / ultraviolet absorbing layer as a reference, the thickness of the penetration region is calculated from the distribution of the portion where both fragment ions derived from the liquid crystal component derived from the positive A layer and fragment ions derived from the photoalignment component contained in the alignment layer / ultraviolet absorbing layer are detected.

[0020] The thickness of the permeation region may be 30 nm or more, or 50 nm or more, from the viewpoint of improving adhesion and heat-resistant adhesion, whereas the thickness of the permeation region may be 100 nm or less, 80 nm or less, or 60 nm or less, from the viewpoint of liquid crystal alignment ability in the vicinity of the permeation region.

[0021] The optical laminate of the present disclosure is an optical laminate comprising a positive A layer and an alignment layer / ultraviolet absorbing layer in direct contact with the positive A layer, wherein the optical laminate has a transmittance of 1.0% or less at a wavelength of 380 nm and a transmittance of 20.0% or less at a wavelength of 400 nm, and the alignment layer / ultraviolet absorbing layer includes, at the interface on the positive A layer side, a region penetrated by a liquid crystalline component contained in the positive A layer, thereby having excellent ultraviolet absorption ability and improving adhesion, particularly adhesion under moist heat, and contributing to thinning and improved productivity. In the optical laminate of the present disclosure, the alignment layer / ultraviolet absorbing layer in direct contact with the positive A layer contains a large amount of ultraviolet absorber to an extent that it exhibits predetermined ultraviolet absorption characteristics, and the hardness is controlled so as to include, at the interface on the positive A layer side, a region penetrated by the liquid crystalline component contained in the positive A layer. As a result, it is presumed that the optical laminate of the present disclosure can accelerate the curing reaction of the liquid crystalline component in the permeation region due to the heat generated by a large amount of UV absorber when UV irradiation is performed when forming the positive A layer on the alignment layer / UV absorbing layer, thereby more firmly bonding the interface between the two layers in the permeation region, resulting in a laminate with high adhesion. Furthermore, it is presumed that the protective function in a humid and hot environment due to the large amount of UV absorber contained therein also improves the adhesion under humid and heat due to the synergistic effect of suppressing fluctuations of the liquid crystalline component at the interface caused by humid and heat. The optical laminate of the present disclosure has excellent UV absorption ability, which can block blue light, suppress eye damage, and improve the light resistance of the optical laminate. Furthermore, the optical laminate of the present disclosure has good adhesion between the positive A layer and the alignment layer / UV absorbing layer, directly laminated together. This eliminates the need for a separate UV absorbing layer as in the prior art, allowing for a thinner product and more efficient manufacturing process, improving productivity.

[0022] In the optical laminate of the present disclosure, the photo-alignment component may be present in a relatively larger amount at the interface on the positive A layer side in the thickness direction of the alignment layer / ultraviolet absorbing layer than at the surface on the side not in contact with the positive A layer. When the photo-alignment component is unevenly distributed in the thickness direction of the alignment layer / ultraviolet absorbing layer so that it is relatively more abundant at the interface on the positive A layer side, even if the photo-alignment component is present in a small amount in the alignment layer / ultraviolet absorbing layer, the photo-alignment component is sufficiently present on the surface on the positive A layer side, thereby achieving liquid crystal alignment ability to horizontally align the positive A layer. On the other hand, the alignment layer / ultraviolet absorbing layer can contain a large amount of ultraviolet absorber on the side not in contact with the positive A layer, thereby achieving excellent ultraviolet absorption ability. When the photo-alignment component is unevenly distributed in the thickness direction of the alignment layer / ultraviolet absorbing layer so that it is relatively more abundant at the interface on the positive A layer side, both excellent alignment ability on the positive A layer side and excellent ultraviolet absorption ability can be achieved with a thinner film. Furthermore, if the photo-alignment component is unevenly distributed so that it is relatively abundant at the interface on the positive A layer side, excellent alignment ability can be exhibited, and therefore the manufacturing process of the positive A layer can be adjusted to milder conditions. Also, if the photo-alignment component is unevenly distributed so that it is relatively abundant at the interface on the positive A layer side, there is an advantage that the liquid crystal alignment ability is less likely to be impaired even when a third additive is added to the alignment layer / ultraviolet absorbing layer to add further functionality.

[0023] The components included in the optical laminate are described in detail below. 1. Alignment Layer / UV Absorbing Layer The alignment layer / UV absorbing layer 1 of the present disclosure is a layer that exhibits the predetermined UV absorption ability, but also has the liquid crystal alignment ability to horizontally align the positive A layer because it is in direct contact with the positive A layer 2 via the permeation region 3. The alignment layer / UV absorbing layer 1 of the present disclosure may contain a photoalignment component and a UV absorber.

[0024] The alignment layer / UV absorbing layer 1 of the present disclosure is not particularly limited, but may be a cured product of a thermosetting composition containing a photoalignment component, a UV absorber, and a thermal crosslinker, as this layer is more likely to satisfy the above-mentioned characteristics. At least one of the photoalignment component and the UV absorber may have a thermal crosslinking group capable of reacting with the thermal crosslinker. The UV absorber typically contains a hydroxy group that functions as a thermal crosslinking group. From the viewpoints of photoalignment, suppression of bleed-out, and improving adhesion under humid and hot conditions, both the photoalignment component and the UV absorber may have a thermal crosslinking group. When the alignment layer / UV absorbing layer 1 is a cured product of a thermosetting composition containing a photoalignment component, a UV absorber, and a thermal crosslinker, the crosslinked structure improves the heat resistance and solvent resistance of the film, resulting in increased durability. When the alignment layer / UV absorbing layer 1 is a cured product of a thermosetting composition containing a photoalignment component, a UV absorber, and a thermal crosslinker, it is less likely to harden and is more flexible, and its curability is easier to control, compared to when it is a cured product of a photocurable composition. Therefore, it is easy to form a penetration region at the interface with the directly laminated positive A layer while suppressing solvent penetration to the extent that the alignment is reduced. Furthermore, by curing the UV absorber, the photo-alignment component is fixed on the surface of the alignment layer / UV absorbing layer, and it is less likely to be disturbed under the formation conditions of the positive A layer. Therefore, on the surface side of the alignment layer / UV absorbing layer, the photo-alignment component is easily exerted as an alignment layer by irradiation with polarized light, and the cured film is easily able to function as an alignment layer / UV absorbing layer. Furthermore, when the alignment layer / UV absorbing layer 1 is a cured product of a thermosetting composition containing a photo-alignment component, a UV absorber, and a thermal crosslinking agent, the optical laminate of the present disclosure has good adhesion between the alignment layer / UV absorbing layer and the positive A layer, and the thickness can be reduced, and the alignment layer / UV absorbing layer is likely to have moderate flexibility, which makes it easy to improve bending resistance.

[0025] 1-1. Photo-alignment component Examples of the photo-alignment component include a compound containing a photo-alignment group as an alignment portion, or a polymer having a photo-alignment structural unit containing a photo-alignment group in a side chain. A photo-alignment polymer having a photo-alignment structural unit containing a photo-alignment group in a side chain may be used, because this tends to improve the photo-alignment property in the alignment layer / ultraviolet absorbing layer 1 even when mixed with an ultraviolet absorber, and from the standpoint of solubility in a solvent.

[0026] The photo-alignment component may have a second site that promotes uneven distribution on the surface, so that it is easily unevenly distributed on the surface so that it is relatively abundant at the interface on the positive A layer side when mixed with an ultraviolet absorber to form an alignment layer / ultraviolet absorbing layer, or may be a compound having a photo-alignment group and a second site that promotes uneven distribution on the surface.The photo-alignment component may be a photo-alignment copolymer that includes a photo-alignment structural unit that contains a photo-alignment group in its side chain and a second structural unit that promotes uneven distribution on the surface, so that it is easily unevenly distributed on the surface so that it is relatively abundant at the interface on the positive A layer side when mixed with an ultraviolet absorber to form an alignment layer / ultraviolet absorbing layer, and the photo-alignment is easily improved.

[0027] The photo-alignment component may further have a thermal crosslinkable group in order to improve the photo-alignment property of the alignment layer / ultraviolet absorbing layer, or may be a compound having a photo-alignment group, a second moiety that promotes uneven distribution to the surface, and a thermal crosslinkable group. The photo-alignment copolymer used in the present disclosure may be a photo-alignment copolymer having a photo-alignment structural unit containing a photo-alignment group in its side chain, a second structural unit that promotes uneven distribution to the surface, and a thermal crosslinkable structural unit containing a thermal crosslinkable group in its side chain. Each structural unit in the photo-alignment copolymer will be described below.

[0028] (1) Photo-orientable structural unit The photo-orientable structural unit in the present disclosure is a moiety that exhibits anisotropy by undergoing a photoreaction upon irradiation with light. The photoreaction is preferably a photodimerization reaction or a photoisomerization reaction. That is, the photo-orientable structural unit is preferably a photodimerization structural unit that exhibits anisotropy by undergoing a photodimerization reaction upon irradiation with light, or a photoisomerization structural unit that exhibits anisotropy by undergoing a photoisomerization reaction upon irradiation with light.

[0029] The photoalignable structural unit contains a photoalignable group in its side chain. As described above, the photoalignable group is a functional group that exhibits anisotropy by undergoing a photoreaction upon irradiation with light, and is preferably a functional group that undergoes a photodimerization reaction or a photoisomerization reaction.

[0030] Examples of photo-alignable groups that cause a photodimerization reaction include cinnamoyl groups, chalcone groups, coumarin groups, anthracene groups, quinoline groups, azobenzene groups, and stilbene groups. The benzene rings in these functional groups may have a substituent. The substituent may be any group that does not interfere with the photodimerization reaction, such as an alkyl group, an aryl group, a cycloalkyl group, an alkoxy group, an aryloxy group, a hydroxy group, a halogen atom, a trifluoromethyl group, and a cyano group.

[0031] The photo-alignable group that undergoes a photoisomerization reaction is preferably one that undergoes a cis-trans isomerization reaction, and examples thereof include a cinnamoyl group, a chalcone group, an azobenzene group, and a stilbene group. The benzene ring in these functional groups may have a substituent. The substituent may be any one that does not interfere with the photoisomerization reaction, and examples thereof include an alkoxy group, an alkyl group, a halogen atom, a trifluoromethyl group, and a cyano group.

[0032] Among these, the photoalignable group is preferably a cinnamoyl group. Specifically, the cinnamoyl group is preferably at least one selected from the group consisting of groups represented by the following formulas (x-1) and (x-2):

[0033]

[0034] In the above formula (x-1), R １ represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, an aryl group having 1 to 18 carbon atoms, or a cycloalkyl group having 1 to 18 carbon atoms. However, the alkyl group, aryl group, and cycloalkyl group may be bonded via an ether bond, an ester bond, an amide bond, or a urea bond, and may have a substituent. R ２ ~R ５R each independently represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 18 carbon atoms, an aryl group having 1 to 18 carbon atoms, a cycloalkyl group having 1 to 18 carbon atoms, an alkoxy group having 1 to 18 carbon atoms, or a cyano group. However, the alkyl group, aryl group, and cycloalkyl group may be bonded via an ether bond, an ester bond, an amide bond, or a urea bond, and may have a substituent. ６ and R ７ each independently represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 18 carbon atoms, an aryl group having 1 to 18 carbon atoms, or an alkoxy group having 1 to 18 carbon atoms. １１ ~R １５ R each independently represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 18 carbon atoms, an aryl group having 1 to 18 carbon atoms, a cycloalkyl group having 1 to 18 carbon atoms, an alkoxy group having 1 to 18 carbon atoms, or a cyano group. However, the alkyl group, aryl group, and cycloalkyl group may be bonded via an ether bond, an ester bond, an amide bond, or a urea bond, and may have a substituent. １６ and R １７ each independently represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 18 carbon atoms, an aryl group having 1 to 18 carbon atoms, or an alkoxy group having 1 to 18 carbon atoms.

[0035] In addition, when the photoalignable group is a cinnamoyl group and is a group represented by the above formula (x-1), the benzene ring of the styrene skeleton (formula (1-2)) contained in the monomer unit may be the benzene ring of the cinnamoyl group.

[0036] The cinnamoyl group represented by the above formula (x-1) is more preferably a group represented by the following formula (x-3).

[0037]

[0038] In the above formula (x-3), R ２ ~R ７ is the same as in the above formula (x-1). ８represents a hydrogen atom, an alkoxy group having 1 to 18 carbon atoms, a cyano group, an alkyl group having 1 to 18 carbon atoms, a phenyl group, a biphenyl group, or a cyclohexyl group. However, the alkyl group, phenyl group, biphenyl group, and cyclohexyl group may be bonded via an ether bond, an ester bond, an amide bond, or a urea bond. n represents an integer of 1 to 5, and R ８ may be bonded at any of the ortho, meta, and para positions. ８ may be the same or different. Among them, n is 1 and R ８ is preferably attached at the para position.

[0039] When the photoalignable group is at least one group selected from the group consisting of groups represented by the above formulas (x-3) and (x-2), an aromatic ring is arranged near the end of the photoalignable structural unit, resulting in a large number of π electrons. This is thought to increase the affinity with the liquid crystal layer formed on the alignment layer, improve the liquid crystal alignment ability, and increase the adhesion to the liquid crystal layer.

[0040] Examples of the monomer unit constituting the photoalignable structural unit include acrylic acid ester, methacrylic acid ester, styrene, acrylamide, methacrylamide, maleimide, vinyl ether, vinyl ester, etc. Among these, acrylic acid ester, methacrylic acid ester, and styrene are preferred from the viewpoint of ease of raw material procurement.

[0041] An example of the photoalignable constitutional unit of the present disclosure is a constitutional unit represented by the following formula (1).

[0042] (In the above formula (1), Z １ represents at least one monomer unit selected from the group consisting of the following formulas (1-1) to (1-6), X represents a photoalignment group, and L １ represents a single bond, —O—, —S—, —COO—, —COS—, —CO—, —OCO—, an alkylene group, an arylene group, a cycloalkylene group, or a combination thereof.

[0043] (In the above formulas (1-1) to (1-6), R ２１represents a hydrogen atom, a methyl group, a chlorine atom, or a phenyl group; R ２２ represents a hydrogen atom or a methyl group, R ２３ is a hydrogen atom, a methyl group, a chlorine atom or a phenyl group, R ２４ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.

[0044] The monomer unit constituting the photoalignable structural unit may be at least one selected from the group consisting of the above formulas (1-1) to (1-6). １ is at least one selected from the group consisting of formula (1-2), -L １ -X may be bonded to any of the ortho, meta, and para positions, but -L １ It is preferable that —X is bonded to the para position, since the distance between the photoalignable groups tends to be small and photoalignment is easily obtained.

[0045] As the monomer unit constituting the photo-alignable structural unit, at least one selected from the group consisting of formulas (1-1) and (1-2) is preferred from the viewpoint of ease of raw material procurement. Furthermore, at least one selected from the group consisting of formula (1-2) is more preferred because it increases the rigidity of the photo-alignable structural unit of the photo-alignable copolymer, making it easier to reduce the distance between the photo-alignable groups and to obtain excellent photo-alignment properties. Furthermore, if the copolymer has a styrene skeleton and contains a large number of π-electron systems, it is believed that the interaction of the π-electron systems will also increase the adhesion of the alignment layer / ultraviolet absorbing layer of the present disclosure to the liquid crystalline component laminated directly on this alignment layer / ultraviolet absorbing layer.

[0046] In the above formula (1), X represents a photo-alignable group, which may be the same as described above, and may include at least one selected from the group consisting of cinnamoyl groups, chalcone groups, coumarin groups, anthracene groups, quinoline groups, azobenzene groups, and stilbene groups. The benzene ring in these functional groups may have a substituent. The substituent may be any group that does not interfere with the photodimerization reaction or photoisomerization reaction, such as an alkyl group, an aryl group, a cycloalkyl group, an alkoxy group, a hydroxy group, a halogen atom, a trifluoromethyl group, or a cyano group. Of these, a cinnamoyl group is preferred as the photo-alignable group. Specifically, groups represented by the above formulas (x-1) and (x-2) are preferred.

[0047] L １ represents a single bond, —O—, —S—, —COO—, —COS—, —CO—, —OCO—, an alkylene group, an arylene group, a cycloalkylene group, or a combination thereof, and connects the monomer unit and the photoalignable group X.

[0048] The above L １ is a single bond, the photo-alignable group X is a monomer unit Z １ Specific examples of the divalent linking group include -O-, -S-, -COO-, -COS-, -CO-, -OCO-, and -(CH ２ ) ｎ -, -(CH ２ CH ２ O) ｍ -, -C ６ H ４ -, -C ６ H １０ -, -(CH ２ ) ｎ O-, -(CH ２ CH ２ O) ｍ O-, -C ６ H ４ O-, -C ６ H １０ O-, -O(CH ２ ) ｎ O-, -O(CH ２ CH ２ O) ｍ O-, -OC ６ H ４ O-, -OC６ H １０ O-, -OCO(CH ２ ) ｎ COO-, -OCO(CH ２ CH ２ O) ｍ COO-,-OCOC ６ H ４ O-, -OCOC ６ H １０ O-, -COO(CH ２ ) ｎ O-, -COO(CH ２ CH ２ O) ｍ --, --COOC ６ H ４ O-, -COOC ６ H １０ O-, etc., where -C ６ H ４ - is a phenylene group, -C ６ H １０ "-" represents a cyclohexylene group, n is 1 to 20, and m is 1 to 10.

[0049] From the viewpoint of photo-alignment, it is preferable that the alkylene chain between the monomer unit and the photo-alignment group X is short. In the photo-alignment structural unit, a structure in which the alkylene chain is short increases rigidity, and the distance between the photo-alignment groups tends to be small, which is presumed to improve photo-alignment (liquid crystal alignment ability). From the viewpoint of photo-alignment, it is preferable that the n and m are small, n is preferably 1 to 6, more preferably 1 to 4, and m is preferably 1 to 3, more preferably 1 to 2. From the viewpoint of photo-alignment, it is more preferable that the photo-alignment structural unit has a structure in which there is no alkylene chain between the photo-alignment group and the main chain of the photo-alignment copolymer, and L １ is more preferably a single bond, —O—, —S—, —COO—, —COS—, —CO—, —OCO—, or a combination of any of these with an arylene group.

[0050] The photo-alignable copolymer may have one or more types of photo-alignable structural units. A monomer having a photo-alignable group that induces the photo-alignable structural unit can be used to synthesize the photo-alignable copolymer. The monomer having a photo-alignable group can be used alone or in combination of two or more types.

[0051] The content of the photo-alignable structural unit in the photo-alignable copolymer can be set within a range of 10 mol% to 95 mol%, preferably 20 mol% to 80 mol%, and may be within a range of 30 mol% to 60 mol%, assuming the amount of structural units contained in the entire photo-alignable copolymer as 100 mol%. If the content of the photo-alignable structural unit is low, the sensitivity may decrease, making it difficult to impart good liquid crystal alignment ability. On the other hand, if the content of the photo-alignable structural unit is high, the content of the second structural unit or the thermally crosslinkable structural unit, which relatively promotes uneven distribution to the surface, may decrease, making it difficult to exhibit or maintain good liquid crystal alignment ability.

[0052] (2) Second structural unit that promotes uneven distribution on the surface The photo-alignable copolymer used in the present disclosure preferably has a second structural unit as a moiety that promotes uneven distribution of the photo-alignable copolymer on the surface when the photo-alignable copolymer is mixed with an ultraviolet absorber. The moiety that promotes uneven distribution of the photo-alignable copolymer on the surface is not particularly limited as long as it contains the moiety and can promote uneven distribution on the surface when the photo-alignable copolymer is mixed with an ultraviolet absorber.

[0053] Examples of the moiety that promotes uneven distribution of the photo-alignable copolymer on the surface include a silicon atom-containing group, a fluorine atom-containing group, and a linear or branched alkyl group having a predetermined number of carbon atoms or more. More specifically, examples of the moiety that promotes uneven distribution of the photo-alignable copolymer on the surface include a silicon atom-containing group (-(O) ｂ -Si(E) ３ [wherein each E independently represents a hydrogen atom, a halogen atom, a linear or branched alkyl group, an aryl group, a linear or branched alkoxy group, -(O) ｂ’ -Si(E') ３ , or -{O-Si(E") ２ -}ａ and E" represents a straight-chain or branched alkyl group, E' and E" each independently represent a hydrogen atom, a halogen atom, a straight-chain or branched alkyl group, an aryl group, or a straight-chain or branched alkoxy group; a represents a number of 1 or more and 10 or less; b and b' each independently represent 0 or 1, and when b and b' each independently represent 0, a single bond is represented. ]), or a straight-chain or branched alkyl group substituted with the silicon atom-containing group (wherein the alkyl group may have -O- in the carbon chain, or may be substituted with a hydroxy group, a halogen atom, or a straight-chain or branched alkoxy group); a straight-chain or branched alkyl group containing a fluorine atom; a straight-chain or branched alkyl group having 4 or more carbon atoms which may have -O- in the carbon chain. Examples of the silicon atom-containing group, the fluorine atom-containing group, and the straight-chain or branched alkyl group having a predetermined number of carbon atoms or more include, but are not limited to, those described below in relation to Q in formula (2).

[0054] The linear or branched alkyl group substituted with a silicon atom-containing group, the linear or branched alkyl group containing a fluorine atom, and the linear or branched alkyl group having 4 or more carbon atoms and optionally containing -O- in the carbon chain may each be bonded to a monomer unit via a linking group L. Examples of the linking group L include -O-, -S-, -COO-, -COS-, -CO-, -OCO-, or combinations of these with an arylene group. From the viewpoints of ease of raw material procurement, suppression of cissing during positive A layer formation, and improved adhesion, the moiety that promotes uneven distribution of the photoalignable copolymer on the surface may be a linear or branched alkyl group having 4 or more carbon atoms and optionally containing -O- in the carbon chain, or a linear or branched alkoxy group having 4 or more carbon atoms and optionally containing -O- in the carbon chain. The linear or branched alkyl group or the linear or branched alkoxy group may have 18 or fewer carbon atoms, 16 or fewer carbon atoms, or 12 or fewer carbon atoms. From the viewpoint of easily promoting uneven distribution of the photoalignable copolymer on the surface, the carbon number may be 5 or more.

[0055] Examples of the monomer unit that constitutes the second structural unit include acrylic acid ester, methacrylic acid ester, styrene, acrylamide, methacrylamide, maleimide, vinyl ether, and vinyl ester.

[0056] An example of the second constitutional unit is a constitutional unit represented by the following formula (2).

[0057] (In the above formula (2), Z ２ represents at least one monomer unit selected from the group consisting of the following formulas (2-1) to (2-6), and L ２ represents a single bond, —O—, —S—, —COO—, —COS—, —CO—, —OCO—, or a combination of any of these with an arylene group, and Q represents a group satisfying any of the following (i) to (iii): (i)-(O) ｂ -Si(E) ３ [wherein each E independently represents a hydrogen atom, a halogen atom, a linear or branched alkyl group, an aryl group, a linear or branched alkoxy group, -(O) ｂ’ -Si(E') ３ , or -{O-Si(E") ２ -} ａ a represents a number of 1 or more and 10 or less; b and b' represent 0 or 1; and when b and b' are each independently 0, they represent a single bond.] (wherein the alkyl group may have -O- in the carbon chain, and may be substituted with a hydroxy group, a halogen atom, or a straight-chain or branched alkoxy group), or -Si(E) ３ (wherein E is the same as above) and has a total carbon number of 3 to 18; (ii) a linear or branched alkyl group containing a fluorine atom and having a total carbon number of 3 to 18; (iii) a linear or branched alkyl group which may have -O- in the carbon chain and has a total carbon number of 4 to 18; here, the total carbon number refers to the sum of the number of carbon atoms in Q.)

[0058] (In the above formulas (2-1) to (2-6), R ３１ represents a hydrogen atom, a methyl group, a chlorine atom, or a phenyl group; R ３２ represents a hydrogen atom or a methyl group, R ３３ is a hydrogen atom, a methyl group, a chlorine atom or a phenyl group, R ３４ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.

[0059] As the monomer unit constituting the second structural unit, from the viewpoint of ease of procurement of raw materials, at least one selected from the group consisting of formulas (2-1) and (2-2) is preferable. Furthermore, at least one selected from the group consisting of formula (2-2) is more preferable from the viewpoint of more easily forming a permeation region and improving adhesion.

[0060] L ２ represents a single bond, —O—, —S—, —COO—, —COS—, —CO—, —OCO—, or a combination of any of these with an arylene group, and links the monomer unit with the moiety Q that promotes uneven distribution of the photoalignable copolymer on the surface.

[0061] The above L ２ When is a single bond, the moiety Q that promotes localization of the photoalignment copolymer to the surface is a monomer unit Z ２ Specific examples of the divalent linking group include -O-, -S-, -COO-, -COS-, -CO-, -OCO-, and -C ６ H ４ -, -C ６ H ４ O-, -OC ６ H ４ O-, -OCOC ６ H ４ O-, -COOC ６ H ４ O-, etc., where -C ６ H ４ - represents a phenylene group.

[0062] In the above formula (2), (i) in Q is -(O) ｂ -Si(E) ３[wherein each E independently represents a hydrogen atom, a halogen atom, a linear or branched alkyl group, an aryl group, a linear or branched alkoxy group, -(O) ｂ’ -Si(E') ３ , or -{O-Si(E") ２ -} ａ a represents a number of 1 or more and 10 or less; b and b' represent 0 or 1; and when b and b' are each independently 0, they represent a single bond.] (wherein the alkyl group may have -O- in the carbon chain, and may be substituted with a hydroxy group, a halogen atom, or a straight-chain or branched alkoxy group), or -Si(E) ３ (where E is the same as defined above) and represents a group having a total carbon number of 3 to 18. (i) in Q is a silicon atom-containing group, and the total carbon number may be 3 or more and may be 13 or less. Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. Examples of the linear or branched alkyl group include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an s-butyl group, a t-butyl group, an n-pentyl group, an n-hexyl group, an n-pentyl group, an n-octyl group, a 2-ethylhexyl group, an n-nonyl group, an n-decyl group, an n-undecyl group, an n-dodecyl group, an n-tridecyl group, an n-tetradecyl group, an n-pentadecyl group, and an n-hexadecyl group. Examples of the aryl group include a phenyl group, a 4-methylphenyl group, a 2,4,6-trimethylphenyl group, and a naphthyl group. Examples of the linear or branched alkoxy group include a methoxy group, an ethoxy group, an n-propoxy group, an i-propoxy group, an n-butoxy group, an s-butoxy group, a t-butoxy group, and an n-pentoxy group. ｂ’ -Si(E') ３ , or -{O-Si(E") ２ -} ａIn E", E' and E" each independently represent a hydrogen atom, a halogen atom, a linear or branched alkyl group, an aryl group, or a linear or branched alkoxy group, and examples of the halogen atom, the linear or branched alkyl group, the aryl group, and the linear or branched alkoxy group may be the same as those described above. In the silicon atom-containing group in (i), E is preferably a linear or branched alkyl group, a linear or branched alkoxy group, -(O) ｂ’ -Si(E') ３ , or -{O-Si(E") ２ -} ａ E" may be a linear or branched alkyl group, a linear or branched alkoxy group, or -(O) ｂ’ -Si(E') ３ It may be.

[0063] In the above formula (2), examples of (i) in Q include trialkoxysilylalkyl groups such as trimethoxysilylmethyl group, trimethoxysilylethyl group, trimethoxysilylpropyl group, and triethoxysilylmethyl group; trialkylsilylalkyl groups such as trimethylsilylmethyl group, triethylsilylethyl group, tri(i-propyl)silylbutyl group, and dimethylethylsilylmethyl group; trialkylsilyloxyalkyl groups such as trimethylsilyloxymethyl group, triethylsilyloxyethyl group, tri(i-propyl)silyloxybutyl group, and t-butyldimethylsilyloxybutyl group; dialkoxyalkylsilylalkyl groups such as dimethoxymethylsilylmethyl group, dimethoxymethylsilylethyl group, and dimethoxymethylsilylpropyl group; alkoxydialkylsilylalkyl groups such as methoxydimethylsilylmethyl group and methoxydimethylsilylpropyl group; tris(trialkylsilyl)silylalkyl groups such as tris(trimethylsilyl)silylmethyl group; tris(trialkylsiloxy)silylalkyl groups such as tris(trimethylsiloxy)silylpropyl group; —Si(Me) ２ -{O-Si(Me) ２ -} ａ-Si(E) such as n-propyl group substituted with -n-Bu (where Me is methyl group, n-Bu is n-butyl group, and a is 9) ２ -{O-Si(E") ２ -} ａ alkyl groups having —O— in the carbon chain and substituted with a hydroxy group, such as a 2-[tris(trimethylsilyl)silylpropoxy]ethyl group; alkyl groups having —O— in the carbon chain and substituted with a hydroxy group, such as a 3-[3-(trimethoxysilyl)propoxy]-2-hydroxypropyl group or a 3-{3-[bis(trimethylsiloxy)methylsilyl]propoxy}-2-hydroxypropyl group; or trialkoxysilyl groups such as a trimethoxysilyl group or a triethoxysilyl group; trialkylsilyl groups such as a trimethylsilyl group, a triethylsilyl group or a tri(i-propyl)silyl group; dialkoxyalkylsilyl groups such as a dimethoxymethylsilyl group; alkoxydialkylsilyl groups such as a methoxydimethylsilyl group; tris(trialkylsilyl)silyl groups such as a tris(trimethylsilyl)silyl group; and tris(trialkylsiloxy)silyl groups such as a tris(trimethylsiloxy)silyl group.

[0064] In the above formula (2), (ii) in Q represents a linear or branched alkyl group containing a fluorine atom and having a total carbon number of 3 to 18. The total carbon number of (ii) may be 3 or more, and may be 12 or less. The linear or branched alkyl group containing a fluorine atom in (ii) may be a perfluoroalkyl group in which all of the hydrogen atoms of the alkyl group have been substituted with fluorine atoms. From the viewpoint of ease of raw material procurement, it may be a partially fluorinated alkyl group in which some of the hydrogen atoms of the alkyl group have been substituted with fluorine atoms. The number of fluorine atoms in the fluorine atom-containing alkyl group may be 1 or more, or may be 3 or more, and may be 25 or less, or may be 20 or less. From the viewpoint of easily promoting uneven distribution of the copolymer, the proportion of fluorine atoms in the linear or branched alkyl group containing a fluorine atom may be 30% to 90%, or may be 50% to 80%, of the total number of hydrogen atoms and fluorine atoms in the linear or branched alkyl group.

[0065] In the above formula (2), (ii) in Q is, for example, —(CH ２ ) p -(CF ２ ) ｑ -CF ３ (wherein p represents 0 or more and 16 or less, q represents 0 or more and 17 or less, and p+q represents 2 or more and 17 or less), p is preferably 0 or more and 10 or less, preferably 1 or more and 8 or less, and more preferably 2 or more and 4 or less, q is preferably 1 or more and 11 or less, preferably 1 or more and 9 or less, and more preferably 2 or more and 7 or less, and p+q is preferably 2 or more and 11 or less.

[0066] In the above formula (2), (iii) in Q represents a linear or branched alkyl group which may have -O- in the carbon chain and has a total carbon number of 4 to 18. The total carbon number of (iii) may be 4 or more, and may be 16 or less. The total carbon number of (iii) may be 5 or more, since this facilitates uneven distribution of the photoalignable copolymer on the surface. The linear or branched alkyl group which may have -O- in the carbon chain may be an alkoxyalkyl group, an alkoxyalkoxyalkyl group, or a group containing a polyoxyethylene chain or a polyoxypropylene chain.

[0067] In the above formula (2), (iii) in Q may, for example, be a linear or branched alkyl group such as an n-butyl group, an s-butyl group, a t-butyl group, an n-pentyl group, an n-hexyl group, an n-pentyl group, an n-octyl group, an n-nonyl group, an n-decyl group, an n-undecyl group, an n-dodecyl group, an n-tridecyl group, an n-tetradecyl group, an n-pentadecyl group, an n-hexadecyl group, a 2-ethylhexyl group, a 2-ethylbutyl group, a 1,1-diethylpropyl group, or a 2-hexyldodecyl group; a linear or branched alkoxyalkyl group such as a methoxypropyl group, a 3,3-dimethoxypropyl group, a 3-methyl-3-methoxybutyl group, or a 3,3-dimethylbutoxybutyl group; a linear or branched alkoxyalkoxyalkyl group such as a methoxymethoxypropyl group or a methoxyethoxyethyl group; -(CH ２ ) ｒ -(OCH ２ CH ２ )ｓ -OCH ３ (wherein r is 0 or more and 10 or less, s is 1 or more and 7 or less, and r+s×2 is 3 or more and 17 or less, and may be 15 or less); -(CH ２ ) ｔ - (CH ２ C(CH ３ ) H) ｕ -(OCH ２ C(CH ３ ) H) ｖ -OCH ３ (wherein t is 0 or more and 10 or less, u is 0 or more and 4 or less, v is 1 or more and 5 or less, and t+u+v×3 is 4 or more and 17 or less, and may be 15 or less), etc.

[0068] The second structural unit contained in the copolymer may be one type or two or more types. A monomer having a moiety Q that induces the second structural unit and promotes uneven distribution of the photo-alignable copolymer on the surface can be used in the synthesis of the copolymer. Monomers having a moiety Q that promotes uneven distribution of the photo-alignable copolymer on the surface can be used alone or in combination of two or more types.

[0069] Examples of monomers having a moiety Q that promotes uneven distribution of the photoalignable copolymer on the surface include, but are not limited to, the following: In the structural formula, Me represents a methyl group.

[0070]

[0071]

[0072]

[0073] The content of the second structural unit in the copolymer can be set within the range of 1 mol% to 50 mol%, preferably within the range of 3 mol% to 20 mol%, when the amount of structural units contained in the entire copolymer is taken as 100 mol%. If the content of the second structural unit is low, the effect of promoting uneven distribution of the photo-alignable copolymer to the surface may not be sufficient, making it difficult to maintain good liquid crystal alignment ability. Furthermore, if the content of the second structural unit is high, the content of the photo-alignable structural unit may be relatively low, which may reduce sensitivity and make it difficult to impart good liquid crystal alignment ability.

[0074] (3) Thermally Crosslinkable Structural Unit The thermally crosslinkable structural unit in the present disclosure is a moiety that bonds with a thermal crosslinking agent upon heating. It is preferable that the photo-alignable copolymer contains a thermally crosslinkable structural unit, since the alignment is less likely to be disturbed during the formation of the positive A layer, and the alignment in the alignment layer / UV absorbing layer is more likely to be good. Furthermore, it is preferable that the photo-alignable copolymer contains a thermally crosslinkable structural unit, since it is easier to control the hardness and transferability of the alignment layer / UV absorbing layer. The thermally crosslinkable structural unit may be a structural unit having a thermally crosslinkable group. Examples of the thermally crosslinkable group include groups that crosslink upon heating at temperatures between 30°C and 250°C, such as hydroxy groups, carboxy groups, phenolic hydroxy groups, mercapto groups, glycidyl groups, amino groups, and amide groups. Among these, from the viewpoint of reactivity, aliphatic hydroxy groups are preferred, and primary hydroxy groups are more preferred. A primary hydroxy group refers to a hydroxy group in which the carbon atom to which the hydroxy group is bonded is a primary carbon atom.

[0075] The thermally crosslinkable group may also be a self-crosslinkable group capable of crosslinking with the same crosslinkable group. Examples of the self-crosslinkable group include a hydroxymethyl group, an alkoxymethyl group, a trialkoxysilyl group, and a blocked isocyanate group. When the thermally crosslinkable structural unit has a self-crosslinkable group, the thermally crosslinkable structural unit can also function as a thermal crosslinking agent, which is preferable because it is likely to improve photoalignment performance and solvent resistance. When the thermally crosslinkable structural unit has a self-crosslinkable group, it is thought that it is likely to react with the thermally crosslinkable structural unit in the molecule.

[0076] Among these, the thermally crosslinkable structural unit preferably contains at least one selected from the group consisting of a hydroxy group, a carboxy group, and a mercapto group, from the viewpoint of photoalignment performance and solvent resistance. Among these, the thermally crosslinkable structural unit preferably contains a structural unit having at least one thermally crosslinkable group selected from the group consisting of a hydroxy group, a carboxy group, and a mercapto group, and a structural unit having at least one self-crosslinking group selected from the group consisting of a hydroxymethyl group, an alkoxymethyl group, a trialkoxysilyl group, and a blocked isocyanate group, from the viewpoint of more easily improving photoalignment performance and solvent resistance.

[0077] The alkoxymethyl group of the self-crosslinking group is preferably one in which the carbon number of the alkoxy group is 1 to 6, and specific examples include a methoxymethyl group, an ethoxymethyl group, various propoxymethyl groups, various butoxymethyl groups, various pentoxymethyl groups, etc. Among them, the alkoxymethyl group is more preferably one in which the carbon number of the alkoxy group is 1 to 4, and even more preferably one in which the carbon number is 1 to 2, and a methoxymethyl group or an ethoxymethyl group is preferred from the viewpoint of good crosslinkability.

[0078] Examples of monomer units constituting the thermally crosslinkable constituent unit include acrylic acid esters, methacrylic acid esters, styrene, acrylamide, methacrylamide, maleimide, vinyl ethers, vinyl esters, etc. When the thermally crosslinkable group is a carboxy group, the thermally crosslinkable constituent unit may be a constituent unit derived from acrylic acid or methacrylic acid, and when the thermally crosslinkable group is a hydroxy group, it may be a constituent unit derived from vinyl alcohol.

[0079] An example of the thermally crosslinkable constituent unit is a constituent unit represented by the following formula (3).

[0080] (In the above formula (3), Z ３ represents at least one monomer unit selected from the group consisting of the following formulas (3-1) to (3-6), and R ５０ represents a linear alkylene group having 1 to 11 carbon atoms which may have —O— in the carbon chain, and Y represents a thermally crosslinkable group.

[0081] (In the above formulas (3-1) to (3-6), R ５１ represents a hydrogen atom, a methyl group, a chlorine atom, or a phenyl group; R ５２ represents a hydrogen atom or a methyl group, R ５３ is a hydrogen atom, a methyl group, a chlorine atom or a phenyl group, R ５４ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; L ３ represents a single bond, —O—, —S—, —COO—, —COS—, —CO—, or —OCO—; L ３ is a single bond, R ５０ is directly bonded to the styrene backbone.)

[0082] In addition, Z ３ is at least one selected from the group consisting of formula (3-2), -L ３ -Y may be bonded to any of the ortho, meta, and para positions, but -L ３ It is preferable that —Y is bonded at the para position, since this provides excellent reactivity in thermal crosslinking.

[0083] As the monomer unit constituting the thermally crosslinkable constitutional unit, at least one selected from the group consisting of formulae (3-1) and (3-2) is preferred from the viewpoint of ease of procurement of raw materials.

[0084] In the above formula (3), the thermally crosslinkable group of Y may be the same as above, or may be a self-crosslinkable group. In the above formula (3), the thermally crosslinkable group of Y may be at least one type of thermally crosslinkable group selected from the group consisting of a hydroxy group, a carboxy group, a mercapto group, a glycidyl group, an amino group, an amide group, a hydroxymethyl group, an alkoxymethyl group, a trialkoxysilyl group, a blocked isocyanate group, and an alkoxy group substituted with a methyl group, or may be at least one type of thermally crosslinkable group selected from the group consisting of a hydroxy group, a carboxy group, a mercapto group, a glycidyl group, an amino group, and an amide group. The hydroxymethyl group and the alkoxymethyl group, which are self-crosslinkable groups, may be substituted with a methyl group (R ５０The thermally crosslinkable group represented by Y may be a group in which a hydroxy group or an alkoxy group is substituted for the methylene group in the formula (I) to form a hydroxymethyl group or an alkoxymethyl group. From the viewpoint of reactivity, the thermally crosslinkable group represented by Y preferably contains an aliphatic hydroxy group, and more preferably contains a primary hydroxy group.

[0085] In the above formula (3), L ３ represents a single bond, —O—, —S—, —COO—, —COS—, —CO—, or —OCO—. ３ is a single bond, the thermal crosslinkable group Y is a monomer unit Z ３ is directly bonded to R ５０ is a linear alkylene group having 1 to 11 carbon atoms which may have —O— in the carbon chain, and —(CH ２ ) ｊ -or- (C ２ H ４ O) ｋ -C ２ H ４ Preferably, j is 1 to 11 and k is 1 to 4, more preferably j is 2 to 11 and k is 1 to 4, and even more preferably j is 4 to 11 and k is 2 to 4. If j and k are too small, the distance between the thermally crosslinkable group and the main skeleton of the copolymer in the thermally crosslinkable constituent unit becomes short, making it difficult for the thermal crosslinking agent to bond to the thermally crosslinkable group, and there is a risk of reducing the reactivity between the thermally crosslinkable constituent unit and the thermal crosslinking agent. On the other hand, if j and k are too large, the chain length of the linking group in the thermally crosslinkable constituent unit becomes long, making it difficult for the terminal thermally crosslinkable group to be exposed to the surface, making it difficult for the thermal crosslinking agent to bond to the thermally crosslinkable group, and there is a risk of reducing the reactivity between the thermally crosslinkable constituent unit and the thermal crosslinking agent.

[0086] The copolymer may have one or more types of thermally crosslinkable structural units. A monomer having a thermally crosslinkable group that induces the thermally crosslinkable structural unit can be used to synthesize the copolymer. The monomer having a thermally crosslinkable group can be used alone or in combination of two or more types.

[0087] Examples of monomers having a thermally crosslinkable group include, but are not limited to, the following: acrylic acid ester compounds and methacrylic acid ester compounds include, for example, monomers having a hydroxy group and an acrylic group or a methacrylic group, such as 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 3-hydroxypropyl acrylate, 3-hydroxypropyl methacrylate, 4-hydroxybutyl acrylate, 4-hydroxybutyl methacrylate, 2,3-dihydroxypropyl acrylate, 2,3-dihydroxypropyl methacrylate, diethylene glycol monoacrylate, diethylene glycol monomethacrylate, triethylene glycol monoacrylate, tetraethylene glycol monoacrylate, dipropylene glycol monoacrylate, tripropylene glycol monoacrylate, and tetrapropylene glycol monoacrylate. Examples of styrene compounds include monomers having a hydroxy group and a styrene group, such as an ester of 4-vinylbenzoic acid and a diol, an ester of 4-vinylbenzoic acid and diethylene glycol, an ether of hydroxystyrene and a diol, and an ether of hydroxystyrene and diethylene glycol. Specific examples of other monomers that form thermally crosslinkable structural units include the monomers described in paragraphs 0075 to 0079 of Japanese Patent No. 5,626,493. Furthermore, the hydroxy group in the examples may be substituted with a carboxy group or a glycidyl group.

[0088] Among the monomers having a thermal crosslinkable group, examples of the monomer having a self-crosslinking group include acrylamide compounds or methacrylamide compounds substituted with a hydroxymethyl group or an alkoxymethyl group, such as N-hydroxymethylacrylamide, N-hydroxymethylmethacrylamide, N-methoxymethylacrylamide, N-methoxymethylmethacrylamide, N-ethoxymethylacrylamide, N-ethoxymethylmethacrylamide, N-butoxymethylacrylamide, and N-butoxymethylmethacrylamide; monomers having a trialkoxysilyl group, such as 3-trimethoxysilylpropyl acrylate, 3-triethoxysilylpropyl acrylate, 3-trimethoxysilylpropyl methacrylate, and 3-triethoxysilylpropyl methacrylate; and monomers having a blocked isocyanate group, such as 2-(0-(1'-methylpropylideneamino)carboxyamino)ethyl methacrylate and 2-(3,5-dimethylpyrazolyl)carbonylaminoethyl methacrylate.

[0089] The content of the thermally crosslinkable structural unit in the copolymer can be set within the range of 0 mol% to 90 mol%, preferably within the range of 5 mol% to 90 mol%, and more preferably within the range of 20 mol% to 80 mol%, when the amount of structural units contained in the entire copolymer is taken as 100 mol%. If the content of the thermally crosslinkable structural unit is low, sufficient thermosetting properties cannot be obtained, and it may be difficult to maintain good liquid crystal alignment ability. Furthermore, if the content of the thermally crosslinkable structural unit is high, the content of the photoalignable structural unit will be relatively low, which may reduce sensitivity and make it difficult to impart good liquid crystal alignment ability, or excessive curing at the surface may make it difficult to form a penetration region, resulting in reduced adhesion.

[0090] (4) Other Structural Units In the present disclosure, the photo-alignable copolymer may have, in addition to the photo-alignable structural unit, the second structural unit that promotes uneven distribution of the photo-alignable copolymer on the surface, and the thermally crosslinkable structural unit, other structural units that do not fall into any of these categories. By including other structural units in the copolymer, it is possible to improve, for example, solvent solubility, heat resistance, reactivity, etc.

[0091] Examples of monomer units constituting the other structural units include acrylic acid esters, methacrylic acid esters, maleimides, acrylamides, acrylonitrile, maleic anhydride, styrene, vinyl, etc. Among these, acrylic acid esters, methacrylic acid esters, and styrene are preferred, as with the thermally crosslinkable structural units.

[0092] Examples of monomers that form such other structural units include acrylic acid ester compounds, methacrylic acid ester compounds, maleimide compounds, acrylamide compounds, acrylonitrile, maleic anhydride, styrene compounds, vinyl compounds, etc. Specifically, for example, among the monomers described in paragraphs 0036 to 0040 of WO 2010 / 150748, monomers that do not have either the photoalignable group or the thermally crosslinkable group and that do not fall under the category of monomers that derive the second structural unit may be used.

[0093] The other structural unit in the photoalignable copolymer may be of one type or two or more types.

[0094] The content of the other structural units in the copolymer may be in the range of 0 mol % to 50 mol %, or may be in the range of 0 mol % to 30 mol %, when the amount of structural units contained in the entire copolymer is taken as 100 mol %. If the content of the structural units is high, the content of the photoalignable structural unit, the second structural unit, and the thermally crosslinkable structural unit will be relatively low, resulting in a decrease in sensitivity, making it difficult to impart good liquid crystal alignment ability, and insufficient thermosetting properties may be obtained, making it difficult to maintain good liquid crystal alignment ability.

[0095] (5) Photo-Orientable Copolymer The mass-average molecular weight of the photo-orientable copolymer is not particularly limited and can be, for example, approximately 3,000 to 200,000, preferably in the range of 4,000 to 100,000. If the mass-average molecular weight is too large, the solubility in solvents may be reduced or the viscosity may be increased, reducing handleability and making it difficult to form a uniform film. Furthermore, if the mass-average molecular weight is too small, the copolymer may not be sufficiently cured during thermal curing, resulting in reduced solvent resistance and heat resistance. Note that the mass-average molecular weight in this disclosure is a polystyrene-equivalent value measured by gel permeation chromatography (GPC).

[0096] A method for synthesizing the photo-alignable copolymer includes copolymerizing a monomer having a photo-alignable group, a monomer that induces the second structural unit, and, if necessary, a monomer having a thermal crosslinkable group using a conventionally known production method. The photo-alignable copolymer may be used in the form of a solution obtained when the copolymer is synthesized, in the form of a powder, or in the form of a solution obtained by redissolving the purified powder in a solvent described below.

[0097] The photo-alignable copolymer may be used alone or in combination of two or more. In this embodiment, in order to exert alignment ability on the liquid crystal component in direct contact with the composition, the content of the photo-alignable copolymer may be 1 part by mass or more, 5 parts by mass or more, 10 parts by mass or more, 50 parts by mass or less, 30 parts by mass or less, or 20 parts by mass or less, relative to 100 parts by mass of the solid content of the composition for alignment layer and ultraviolet absorbing layer. The photo-alignable copolymer has a second structural unit that promotes uneven distribution of the photo-alignable copolymer on the surface when mixed with an ultraviolet absorber. Therefore, even if the content of the photo-alignable copolymer in the composition for alignment layer and ultraviolet absorbing layer is small, it can exert alignment ability on the liquid crystal component in direct contact with the composition for alignment layer and ultraviolet absorbing layer by unevenly distributing it on the surface of the alignment layer and ultraviolet absorbing layer. As a result, it is possible to relatively increase the content of the ultraviolet absorber and thermal crosslinker in the composition for alignment layer and ultraviolet absorbing layer, thereby achieving sufficient ultraviolet absorption function with a single layer, enabling the composition to be thin, and improving adhesion to the positive A layer and adhesion under moist and hot conditions.

[0098] The photo-alignment component may be used alone or in combination of two or more. As the photo-alignment component, for example, in addition to the photo-alignment copolymer, a compound containing a photo-alignment group may be used, or a compound having a photo-alignment group and a thermally crosslinkable group may be used. In the alignment layer / ultraviolet absorbing layer, from the viewpoint of achieving a predetermined ultraviolet absorption ability and improving adhesion and heat-and-humidity adhesion while exhibiting alignment ability for the liquid crystalline component directly in contact therewith, the content ratio of the photo-alignment component may be 1 part by mass or more, 5 parts by mass or more, or 10 parts by mass or more, or may be 30 parts by mass or less, 25 parts by mass or less, or 20 parts by mass or less, relative to 100 parts by mass of the solid content of the composition for the alignment layer / ultraviolet absorbing layer.

[0099] The ultraviolet absorber used in the present disclosure may have a lower limit of the maximum absorption wavelength of 350 nm or more, or 365 nm or more, and an upper limit of the maximum absorption wavelength of 405 nm or less, or 403 nm or less. That is, in the present disclosure, ultraviolet absorbers include those having a maximum absorption wavelength in the short wavelength region of visible light.

[0100] Examples of structures having ultraviolet absorbing properties include a benzophenone structure, a benzotriazole structure, a triazine structure, a benzoxazinone structure, an anthracene structure, an indole structure, a methine structure, a cyanoacrylate structure, and a salicylic acid ester structure. Among these, compounds having at least one structure selected from the group consisting of a benzotriazole structure, a benzophenone structure, and a triazine structure are preferred because they can easily suppress loss of the ultraviolet absorber due to thermal decomposition or volatilization.

[0101] Examples of compounds having a benzotriazole structure include 2-(2-hydroxy-5-tert-butylphenyl)-2H-benzotriazole, 2-(2-hydroxy-5-tert-octylphenyl)-2H-benzotriazole, 2-(2-hydroxy-5-methylphenyl)-2H-benzotriazole, 2-(2-hydroxy-3-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-5-methacryloyloxyethylphenyl)-2H-benzotriazole, (2-hydroxy-3-dodecyl-5-methylphenyl)benzotriazole, and 2-(2H-benzotriazol-2-yl)-6-(1-methyl-1-phenylethyl)-4-(1,1,3,3-tetramethylbutyl)phenol. Examples of compounds having a benzophenone structure include 2,2-dihydroxy-4-methoxybenzophenone, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octyloxybenzophenone, 2,2-dihydroxy-4,4-dimethoxybenzophenone, and 2,2-dihydroxy-4,4-tetrahydroxybenzophenone. Examples of compounds having a triazine structure include 2-[4-[(2-hydroxy-3-(2'-ethyl)hexyl)oxy]-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, 2-(2-hydroxy-4-[1-octyloxycarbonylethoxy]phenyl)-4,6-bis(4-phenylphenyl)-1,3,5-triazine, 2-[4-[(2-hydroxy-3-dodecyloxypropyl)oxy]-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, and 2,4-bis(2-hydroxy-4-butyloxyphenyl)-6-(2,4-bis-butyloxyphenyl)-1,3,5-triazine.

[0102] The ultraviolet absorber preferably has a thermal crosslinking group capable of reacting with a thermal crosslinking agent described below. The thermal crosslinking group may be the same as that described for the photoalignable copolymer. As in the specific example of the ultraviolet absorber, the ultraviolet absorber usually contains a hydroxy group, and therefore does not need to further have another thermal crosslinking group different from the hydroxy group.

[0103] A polymeric material may be used as the UV absorber. Using a UV-absorbing polymer that is polymerized at the time of addition to the composition for the alignment layer and UV-absorbing layer facilitates the development of liquid crystal alignment ability and improves mechanical strength. Furthermore, using a UV-absorbing polymer that is polymerized at the time of addition to the composition for the alignment layer and UV-absorbing layer facilitates suppressing fluctuations in the phase difference of the positive A layer under humid heat conditions, and facilitates improving adhesion and humid heat adhesion with the positive A layer. It is presumed that using a UV-absorbing polymer in the composition for the alignment layer and UV-absorbing layer inhibits bleeding of the UV absorber into the directly contacting positive A layer, and the alignment layer and UV-absorbing layer functions as a good protective layer against humid heat resistance tests, thereby facilitating suppression of fluctuations in the phase difference of the positive A layer under humid heat conditions and facilitating improving adhesion and humid heat adhesion with the positive A layer.

[0104] Preferred examples of the ultraviolet-absorbing polymer include polymers containing monomer units having a structure with ultraviolet-absorbing properties. The structure with ultraviolet-absorbing properties in the ultraviolet-absorbing polymer may be the same as the structure with ultraviolet-absorbing properties described above. Examples of the monomer units include acrylic acid esters, methacrylic acid esters, maleimides, acrylamides, acrylonitrile, maleic anhydrides, styrene, vinyl, and the like. Among these, as with the photoalignable copolymer, acrylic acid esters, methacrylic acid esters, and styrene are preferred, and acrylic acid esters and methacrylic acid esters are more preferred.

[0105] A polymer containing a monomer unit having a structure with ultraviolet absorbing properties can be polymerized using a monomer containing the structure with ultraviolet absorbing properties. Examples of the monomer containing the structure with ultraviolet absorbing properties include 2-(2-hydroxy-5-methacryloyloxyethylphenyl)-2H-benzotriazole and 2-[2-(6-hydroxybenzo[1,3]dioxol-5-yl)-2H-benzotriazol-5-yl]ethyl methacrylate. These compounds have a substituent containing a polymerizable functional group such as an acryloyloxy group, a methacryloyloxy group, or a vinyl group. The substituent containing a polymerizable functional group such as an acryloyloxy group, a methacryloyloxy group, or a vinyl group may be a linear or branched alkyl group substituted with an acryloyloxy group, a methacryloyloxy group, or a vinyl group. Commercially available products may be used as the monomer containing the structure with ultraviolet absorbing properties, such as RUVA-93 (manufactured by Otsuka Chemical Co., Ltd.).

[0106] The ultraviolet-absorbing polymer may contain a monomer unit having a thermally crosslinkable group in addition to a monomer unit having a structure with ultraviolet absorbing properties. When the ultraviolet-absorbing polymer contains a monomer unit having a thermally crosslinkable group in addition to a monomer unit having a structure with ultraviolet absorbing properties, the hardness of the alignment layer / ultraviolet absorbing layer can be easily adjusted, and the heat resistance, moist heat resistance, solvent resistance, liquid crystal alignment ability, transferability, bending resistance, etc. can be easily adjusted. The monomer unit having a thermally crosslinkable group may be the same as the thermally crosslinkable constituent unit of the photo-alignable copolymer. A ultraviolet-absorbing polymer containing a monomer unit having a thermally crosslinkable group can be obtained by copolymerizing a monomer having a thermally crosslinkable group described in the photo-alignable copolymer with a monomer having the ultraviolet absorbing properties. Among the monomers having a thermally crosslinkable group described in the photo-alignable copolymer, monomers having a hydroxyl group and an acrylic group or methacrylic group, and monomers having a hydroxyl group and a styryl group are particularly preferred.

[0107] The ultraviolet-absorbing polymer may further have other monomer units. Examples of the other monomer units that the ultraviolet-absorbing polymer may have include the same as the other structural units in the photoalignable copolymer. For example, an acrylic acid ester or a methacrylic acid ester such as methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, or isopropyl (meth)acrylate may be further used as a monomer and copolymerized with the monomer having a structure having ultraviolet absorbing properties.

[0108] Furthermore, the ultraviolet-absorbing polymer may have, as another constituent unit, a polymerizable functional group such as an acryloyloxy group, a methacryloyloxy group, a vinyl group, etc. in its side chain. The introduction of the polymerizable functional group into the side chain can be carried out, for example, by reacting the thermally crosslinkable group contained in the ultraviolet-absorbing polymer with a compound having a polymerizable functional group and an isocyanate group.

[0109] The content of the monomer unit having an ultraviolet absorbing structure may be 10% by mass to 80% by mass, or may be 30% by mass to 70% by mass, based on the total mass of the polymer including the monomer unit having an ultraviolet absorbing structure.

[0110] The content of the monomer unit having a thermally crosslinkable group may be 10% by mass to 80% by mass or 20% by mass to 70% by mass relative to the total mass of the polymer including the monomer unit having an ultraviolet absorbing structure, and the content of the other monomer unit may be 0% by mass to 80% by mass or 0% by mass to 50% by mass relative to the total mass of the polymer including the monomer unit having an ultraviolet absorbing structure.

[0111] Examples of a method for synthesizing the ultraviolet-absorbing polymer include a method of polymerizing or copolymerizing a monomer containing a structure having ultraviolet-absorbing properties, and, if necessary, a monomer having a thermal crosslinkable group and other monomers, by a conventionally known production method.

[0112] The mass average molecular weight of the ultraviolet absorbing polymer may be 5,000 to 200,000, 7,000 to 150,000, or 10,000 to 100,000, from the viewpoint of moist heat resistance and the tendency for the photoalignable copolymer to be unevenly distributed on the surface.

[0113] The polymer having an ultraviolet absorbing structure may be a commercially available product, such as Tinuvin (registered trademark) 99-DW, 400-DW, 477-DW, 479-DW (all manufactured by BASF), Newcoat (registered trademark) UVA-204W, UVA-101, UVA-102, UVA-103, UVA-104, Vanaresin (registered trademark) UVA-5080, UVA-5080 (OHV20), UVA-55T, UVA-55MHB, UVA-7075, UVA-7075 (OHV20), UVA-73T (all manufactured by Shin-Nakamura Chemical Co., Ltd.), and ULS-935LH (manufactured by Lion Specialty Chemical Co., Ltd.).

[0114] The ultraviolet absorbers may be used alone or in combination of two or more. In the alignment layer / ultraviolet absorbing layer, in order to achieve a predetermined ultraviolet absorption ability while exhibiting alignment ability for the liquid crystalline component in direct contact with the layer, and to improve adhesion and heat and humidity adhesion, the content of the ultraviolet absorber may be 30 parts by mass or more, 50 parts by mass or more, or 65 parts by mass or more, relative to 100 parts by mass of the solid content of the composition for the alignment layer / ultraviolet absorbing layer, or may be 95 parts by mass or less, 90 parts by mass or less, or 80 parts by mass or less. In the present disclosure, when the photo-aligning copolymer capable of being unevenly distributed on the surface of the alignment layer / ultraviolet absorbing layer is used in combination with the ultraviolet absorber, alignment ability for the liquid crystalline component in direct contact with the layer can be exhibited even with a small amount of the photo-aligning copolymer. Therefore, it is possible to relatively increase the content of the ultraviolet absorber in the composition for the alignment layer / ultraviolet absorbing layer, thereby achieving sufficient ultraviolet absorption function with a single layer, enabling the layer to be thinned, and improving adhesion and heat and humidity adhesion with the positive A layer.

[0115] 1-3. Thermal Crosslinking Agent When the alignment layer / UV absorbing layer is a cured product of a thermosetting composition containing a photo-aligning component, a UV absorber, and a thermal crosslinking agent, a thermal crosslinking agent is used to form the alignment layer / UV absorbing layer. The thermal crosslinking agent may be a thermal crosslinking agent that bonds with the thermal crosslinking group. By bonding with the thermal crosslinking group of at least one of the photo-aligning copolymer and the UV absorber, the thermal crosslinking agent can increase the hardness of the alignment layer / UV absorbing layer, improve its heat resistance, moist heat resistance, and solvent resistance, and adjust its transferability and bending resistance. This makes it difficult for the liquid crystal alignment ability of the photo-aligning component present on the surface of the alignment layer / UV absorbing layer to be disturbed, thereby improving alignment. In addition, the thermal crosslinking agent can also bond with a compound having a thermal crosslinking group, which may be optionally included, to improve the durability of the cured film and contribute to improving the respective functions.

[0116] As the thermal crosslinking agent, a compound that bonds with the thermal crosslinkable group is selected and used. Examples of such thermal crosslinking agents include compounds having a crosslinkable group that can react with the thermal crosslinkable group. Examples of crosslinkable groups possessed by thermal crosslinking agents include epoxy groups, methylol groups, isocyanate groups, blocked isocyanate groups, carboxy groups, protected carboxy groups, and maleimide groups. The number of crosslinkable groups possessed by the thermal crosslinking agent is preferably two or more, and preferably two to six. Examples of thermal crosslinking agents include epoxy compounds, methylol compounds, and isocyanate compounds. Among these, methylol compounds are preferred due to the stability of the thermosetting composition (coating liquid) and the ability to use mild curing conditions. Specific examples of methylol compounds include compounds such as alkoxymethylated glycoluril, alkoxymethylated benzoguanamine, and alkoxymethylated melamine. Specific examples of other thermal crosslinking agents include the thermal crosslinking agents described in paragraphs 0144 to 0148 of WO 2022 / 158555.

[0117] These thermal crosslinking agents can be used alone or in combination of two or more. In the present disclosure, from the viewpoint of improving liquid crystal alignment ability by imparting solvent resistance through a sufficient curing reaction, the content of the thermal crosslinking agent may be 0.1 parts by mass to 30 parts by mass relative to 100 parts by mass of the solid content of the composition for alignment layer and ultraviolet absorbing layer. In particular, from the viewpoint of controlling the formation of a permeation region, controlling various durability and alignment properties of the alignment layer and ultraviolet absorbing layer, and improving storage stability, the content may be 0.5 parts by mass or more, or 1 part by mass or more. On the other hand, from the viewpoint of facilitating the formation of the permeation region, the content may be 25 parts by mass or less, or 20 parts by mass or less.

[0118] The structures derived from the photo-alignment component, UV absorber, and thermal crosslinker contained in the alignment layer / UV absorbing layer can be analyzed using NMR, IR, GC-MS, XPS, TOF-SIMS, or a combination of these. For example, material can be collected from the alignment layer / UV absorbing layer, and the chemical structures of the photo-alignment component, UV absorber, and thermal crosslinker can be analyzed using nuclear magnetic resonance spectroscopy (NMR). Furthermore, fragment ions derived from, for example, photo-alignment groups and UV absorbers can be detected using time-of-flight secondary ion mass spectrometry (TOF-SIMS). Furthermore, peaks of bonds and functional groups derived from the thermal crosslinker and photo-alignment component can be confirmed using X-ray photoelectron spectroscopy (XPS), infrared spectroscopy (IR), and Raman spectroscopy. The structure of the components contained in the alignment layer / UV absorbing layer can be analyzed by combining the results of these analyses.

[0119] 1-4. Acid or Acid Generator When the alignment layer / ultraviolet absorbing layer is a cured product of the thermosetting composition, the thermosetting composition may contain an acid or an acid generator. The acid or acid generator can accelerate the thermal curing reaction of the thermosetting composition.

[0120] The acid or acid generator is not particularly limited as long as it is a sulfonic acid group-containing compound, hydrochloric acid or its salt, or a compound that generates an acid by thermal decomposition during drying and heat curing of the coating film, i.e., a compound that generates an acid by thermal decomposition at a temperature of 50° C. to 250° C. Specifically, those described in paragraph 0054 of WO 2010 / 150748 can be used.

[0121] The content of the acid or acid generator in the composition for alignment layer and ultraviolet absorbing layer of the present disclosure may be 0.01 parts by mass to 20 parts by mass relative to 100 parts by mass of the solid content of the composition for alignment layer and ultraviolet absorbing layer. In particular, from the viewpoints of liquid crystal alignment ability and storage stability, the content may be 0.05 parts by mass to 10 parts by mass, or even 0.05 parts by mass to 5 parts by mass. Furthermore, the content ratio of the acid or acid generator in the composition for alignment layer and ultraviolet absorbing layer of the present disclosure may be 0.05 parts by mass to 20 parts by mass relative to 100 parts by mass of the total of the photoalignment component, ultraviolet absorber, and thermal crosslinking agent. In particular, from the viewpoints of liquid crystal alignment ability and storage stability, the content may be 0.1 parts by mass to 15 parts by mass, or even 0.1 parts by mass to 10 parts by mass. In terms of ease of forming the permeation region, the upper limit may be 5 parts by mass or less.

[0122] 1-5. Other Components The composition for alignment layer / ultraviolet absorbing layer used in the alignment layer / ultraviolet absorbing layer may contain other components. The other components may be appropriately selected and used as long as they do not impair the effects of the present disclosure. Specific examples of the other components include sensitizers, leveling agents, antioxidants, light stabilizers, and compounds having a polymerizable functional group and a thermally crosslinkable group. The other components are not particularly limited and may be appropriately selected from conventionally known additives. The other components may be the same as the other components described in paragraphs 0155 to 0173 of WO 2022 / 158555, for example.

[0123] 1-6. Formation of Alignment Layer and Ultraviolet Absorbing Layer The alignment layer and ultraviolet absorbing layer of the present disclosure can be formed, for example, by preparing a composition for alignment layer and ultraviolet absorbing layer (coating liquid) by dissolving or diluting the components constituting the alignment layer and ultraviolet absorbing layer as described above in a solvent, and then coating and drying the composition on a support.

[0124] The solvent may be appropriately selected from conventionally known solvents capable of dissolving or dispersing the components constituting the alignment layer / UV absorbing layer of the present disclosure. Specific examples include hydrocarbon solvents such as hexane, cyclohexane, and toluene; ketone solvents such as methyl ethyl ketone, methyl isobutyl ketone, cyclopentanone, and cyclohexanone; ether solvents such as tetrahydrofuran, 1,3-dioxolane, and propylene glycol monoethyl ether (PGME); alkyl halide solvents such as chloroform and dichloromethane; ester solvents such as ethyl acetate and propylene glycol monomethyl ether acetate; amide solvents such as N,N-dimethylformamide and N-methylpyrrolidone; sulfoxide solvents such as dimethyl sulfoxide; and alcohol solvents such as methanol, ethanol, and propanol. In this embodiment, the solvents may be used alone or in combination as a mixed solvent.

[0125] In the composition for alignment layer and ultraviolet absorbing layer of the present disclosure, the content of the solvent is not particularly limited as long as each component is uniformly dissolved in the solvent, and may be 50% to 99% by mass, 60% to 95% by mass, or 70% to 90% by mass in the composition including the solvent. Within this range, a uniform film is easily formed. Note that the solid content refers to all components of the composition for alignment layer and ultraviolet absorbing layer excluding the solvent.

[0126] The support may be a substrate, which will be described later, or a functional layer of a substrate further provided with a functional layer. The coating method may be appropriately selected as long as it can form a film with a desired thickness with high accuracy.

[0127] The composition for the alignment layer and ultraviolet absorbing layer may be applied to a support and heated during the process of removing the solvent. By using a photoalignable copolymer containing a second structural unit that promotes surface uneven distribution, the photoalignable copolymer can be unevenly distributed to the surface and dried by heat treatment, thereby solidifying the unevenly distributed state of the photoalignable copolymer on the surface. The heating temperature varies depending on the substances in the composition and must be adjusted appropriately. For example, heating may be performed within a range of 40°C to 150°C, or even within a range of 40°C to 140°C. The heating time can also be adjusted appropriately, but may be, for example, within a range of 10 seconds to 10 minutes, or even within a range of 20 seconds to 5 minutes. Heating means can be appropriately selected from known heating and drying means, such as a hot plate or oven.

[0128] When the composition for the alignment layer / UV absorbing layer is thermosetting, in order to unevenly distribute the photoalignable copolymer on the surface, maintain the uneven distribution, and improve the alignment (liquid crystal alignment ability), it is preferable to control the curing reaction rate by adjusting the heating temperature and the amount of thermal crosslinker and acid, and the solvent removal rate by selecting the solvent, so that the curing reaction is completed and the solvent is removed after the photoalignable copolymer unevenly distributes on the surface. For example, the use of a high-boiling point solvent, drying conditions at low temperatures, and reduced amounts of thermal crosslinker and acid catalyst can reduce the solvent evaporation rate and curing reaction rate, thereby relatively increasing the rate at which the photoalignable copolymer unevenly distributes on the surface. Furthermore, by performing temperature control in two or more stages, the first stage is heated at a low temperature to suppress fixation by curing while unevenly distributing the copolymer on the surface, and then the second stage is heated at a high temperature to promote the curing reaction, thereby controlling the alignment while maintaining the uneven distribution.

[0129] The alignment layer / UV absorbing layer of the present disclosure is preferably formed by further irradiating the thus obtained cured film having a retardation with polarized UV light to impart liquid crystal alignment ability to the cured film. By irradiating the obtained cured film with polarized UV light, the photo-alignable groups of the photo-alignable component, such as a photo-alignable copolymer, undergo a photoreaction, thereby exhibiting anisotropy. The wavelength of the polarized UV light is typically within the range of 150 nm to 450 nm. The direction of irradiation of the polarized UV light can be perpendicular or oblique to the substrate surface. In this way, an alignment layer / UV absorbing layer imparted with liquid crystal alignment ability to align the liquid crystal component of the positive A layer can be formed.

[0130] 1-7. Configuration of the Alignment Layer and UV-Absorbing Layer The alignment layer and UV-absorbing layer of the present disclosure may be a film that contains an UV absorber and is cured in a state in which the photo-alignment group of the photo-alignment component present on the surface has a photodimerization structure or a photoisomerization structure. When the alignment layer and UV-absorbing layer of the present disclosure contains a thermal crosslinking agent, it may have a structure that contains, in one layer, an UV absorber, a photodimerization structure or a photoisomerization structure of the photo-alignment group, and a crosslinked structure formed by bonding a thermal crosslinking group possessed by the UV absorber and / or the photo-alignment component to the thermal crosslinking agent. Furthermore, the alignment layer and UV-absorbing layer may have a structure that contains, in one layer, an UV-absorbing polymer having a crosslinked structure formed by bonding with a thermal crosslinking agent, and a copolymer having a crosslinked structure formed by bonding a photodimerization structure or a photoisomerization structure of the photo-alignment group possessed by the photo-alignment structural unit and a thermal crosslinking group possessed by the thermal crosslinking structural unit to the thermal crosslinking agent.

[0131] As described above, the photo-alignment component may be present in a relatively larger amount at the interface on the positive A layer side in the thickness direction of the alignment layer / UV absorbing layer than at the surface not in contact with the positive A layer. It is preferable that the surface free energy of the interface on the positive A layer side of the alignment layer / UV absorbing layer is smaller than the surface free energy of the surface on the side not in contact with the positive A layer, since this allows for both excellent alignment ability and excellent UV absorption ability on the positive A layer side to be achieved with a thinner film, and the presence of a larger amount of photo-alignment component on the surface results in excellent liquid crystal alignment ability. The difference in surface free energy between the surface on the side not in contact with the positive A layer of the alignment layer / UV absorbing layer and the surface free energy of the interface on the positive A layer side may be 1.0 mN / m or more, or even 2.0 mN / m or more. The difference in surface free energy is typically 25 mN / m or less. The surface free energy was measured using a double titration contact angle / surface free energy analyzer (MSA, manufactured by KRUSS GmbH), measuring the contact angles of water and diiodomethane on the surface of the alignment film / ultraviolet absorbing layer, and calculating the contact angle by ellipse fitting. Measurement conditions included dripping 1 μL of water and diiodomethane, and measuring the contact angle 2 seconds after dripping. Using the contact angle calculated by ellipse fitting, the surface free energy was calculated by the Owens-Wendt-Rable-Kaelble (OWRK) method. The surface tension, dispersive component, and polar component of water and diiodomethane were determined based on the following values: Water: Surface tension 72.8 mN / m (dispersive component 21.8 mN / m + polar component 51.0 mN / m) Diiodomethane: Surface tension 50.8 mN / m (dispersive component 50.8 mN / m + polar component 0 mN / m)

[0132] In particular, when the alignment layer / ultraviolet absorbing layer is analyzed by time-of-flight secondary ion mass spectrometry (TOF-SIMS), it is preferable that the following formula (A) is satisfied, since a larger amount of the photoalignment component is present on the surface, resulting in excellent liquid crystal alignment ability. When the following formula (A) is satisfied, it is easier to achieve both excellent alignment ability on the positive A layer side and excellent ultraviolet absorption ability with a thinner film. Formula (A): I ＡＵ >1.3 x I ＳＵ(In formula (A), I ＡＵ represents the secondary ion intensity derived from the photoalignment component detected at a position 100 nm from the interface of the alignment layer / ultraviolet absorbing layer on the positive A layer side in the thickness direction toward the alignment layer / ultraviolet absorbing layer. ＳＵ represents the secondary ion intensity derived from the photoalignment component detected at a position 100 nm from the surface of the alignment layer / ultraviolet absorbing layer on the side not in contact with the positive A layer in the thickness direction toward the alignment layer / ultraviolet absorbing layer.

[0133] It is more preferable that the alignment layer / ultraviolet absorbing layer further satisfies the following formula (A-1) when analyzed by time-of-flight secondary ion mass spectrometry (TOF-SIMS): Formula (A-1): I ＡＵ >2.0 x I ＳＵ (In formula (A-1), I ＡＵ , and I ＳＵ has the same definition as in formula (A).

[0134] The presence (localization) of a relatively large amount of the photo-alignment component at the interface on the positive A layer side in the thickness direction of the alignment layer / ultraviolet absorbing layer compared to the surface not in contact with the positive A layer is confirmed as follows. Oblique cutting is performed from the surface of the positive A layer of the optical laminate using a surface / interface cutting tester (SAICAS NN-04 model, manufactured by Daipla Wintes). The cutting conditions are as follows: Cutting blade: made of single crystal diamond Blade width: 1 mm Rake angle of cutting blade: 20° Clearance angle of cutting blade: 10° Horizontal speed of cutting blade: 400 nm / sec Vertical speed of cutting blade: 4 nm / sec Figure 3 is a schematic diagram of the preparation of a sample cut obliquely from the surface of the positive A layer 2 to the surface of the alignment layer / ultraviolet absorbing layer 1 not in contact with the positive A layer (interface with substrate 4) in the optical laminate of the present disclosure. Specifically, the cutting blade is moved from the surface of the optical laminate (surface of the positive A layer 2) in the thickness direction (vertical direction) of the film at the above-mentioned rake angle at a vertical speed of 4 nm / sec to perform cutting 5. Next, when the cutting blade reaches the surface of the alignment layer / ultraviolet absorbing layer 1 that is not in contact with the positive A layer (interface with the substrate 4) (cutting 5), the vertical speed is set to 0 μm / min, and the cutting blade is moved only in a direction parallel to the film surface (horizontal direction) to perform cutting 5 (see FIG. 3 ).

[0135] Next, the oblique cut cross section obtained above is subjected to TOF-SIMS measurement. The TOF-SIMS measurement shows the secondary ion intensity I derived from the alignment component detected at a position 100 nm from the interface on the positive A layer side of the alignment layer / ultraviolet absorbing layer in the thickness direction. ＡＵ and a secondary ion intensity I derived from the alignment component detected at a position 100 nm from the surface of the alignment layer / ultraviolet absorbing layer not in contact with the positive A layer (interface with the substrate) toward the alignment layer / ultraviolet absorbing layer in the thickness direction. ＳＵ In addition, the above I ＡＵ and I ＳＵ The TOF-SIMS measurement conditions for determining the above are as follows: Primary ions: Bi ３ ＋＋ Acceleration voltage: 25 kV Primary ion current value: 0.2 pA Measurement area: 300 μm × 300 μm (using a neutralization gun for charge correction) Number of scans: 64 scans The obtained I ＡＵ and I ＳＵ Compared with I ＳＵ <I ＡＵ If the above holds, it can be said that the photo-alignable component is present (localized) in a relatively larger amount at the interface on the positive A layer side compared to the surface not in contact with the positive A layer.

[0136] Furthermore, in the optical laminate of the present disclosure, it is preferable to adjust the composite elastic modulus of the alignment layer / ultraviolet absorbing layer in order to obtain an optical laminate with good bending resistance. The composite elastic modulus of the surface of the alignment layer / ultraviolet absorbing layer not in contact with the positive A layer may be 3.0 GPa or more and 8.0 GPa or less, with the lower limit being 3.5 GPa or more or 4.0 GPa or more, and the upper limit being 7.5 GPa or less, 7.0 GPa or less, or 6.5 GPa or less. When the alignment layer / ultraviolet absorbing layer is a cured product of a thermosetting composition, the composite elastic modulus can be easily adjusted. The composite elastic modulus of the alignment layer / ultraviolet absorbing layer is determined by measuring the indentation hardness (H ＩＴ ) The contact projection area A obtained when measuring ｐThe "indentation hardness" is a value determined from a load-displacement curve from loading to unloading of an indenter obtained by hardness measurement using a nanoindentation method. The composite elastic modulus of the alignment layer / ultraviolet absorbing layer is an elastic modulus that includes the elastic deformation of the alignment layer / ultraviolet absorbing layer and the elastic deformation of the indenter.

[0137] (In the above formula (1), Ap is the contact projected area, Er is the composite elastic modulus of the alignment layer / ultraviolet absorbing layer, and S is the contact rigidity.)

[0138] The composite elastic modulus of the alignment layer / UV absorbing layer is measured on the surface opposite the interface with the positive A layer. The composite elastic modulus of the alignment layer / UV absorbing layer is specifically determined as follows: A cyanoacrylate-based instant adhesive is dropped onto glass, and the alignment layer / UV absorbing layer and the positive A layer are transferred so that the adhesive layer has a film thickness of 45 μm. The substrate is peeled off, and the layers are transferred in the following order: alignment layer / UV absorbing layer / positive A layer / adhesive-attached glass, to prepare a measurement sample. The substrate is peeled off using the measurement sample, and the indentation hardness of the surface of the alignment layer / UV absorbing layer exposed is measured. The indentation hardness (HIT) is measured on the measurement sample using a nanoindenter (TI950 TriboIndenter, manufactured by BRUKER). Under the following measurement conditions, a Berkovich indenter (triangular pyramid) (manufactured by BRUKER, TI-0039) was pressed vertically into the surface of the alignment layer / ultraviolet absorbing layer for 10 seconds until the maximum indentation load reached 3 μN. After that, the indenter was held for a certain time to relax the residual stress, and then the load was released for 10 seconds to measure the maximum load after relaxation, and the maximum load Pmax (μN) and the contact projected area Ap (nm ２) and calculate the indentation hardness (HIT) by Pmax / Ap. The contact projected area is the contact projected area corrected for the indenter tip curvature by the Oliver-Pharr method using a standard sample of fused quartz (manufactured by BRUKER, 5-0098). If any of the measured values ​​deviate from the arithmetic mean value by ±20% or more, that measured value is excluded and remeasured. (Measurement conditions) Loading rate: 0.3 μN / sec Holding time: 5 seconds Loading and unloading rate: 0.3 μN / sec Measurement temperature: 25°C

[0139] Next, the composite elastic modulus Er is calculated from the above-mentioned formula (1) using the contact projected area Ap determined when measuring the indentation hardness (HIT) of the resulting alignment layer / ultraviolet absorbing layer.

[0140] The thickness of the alignment layer / ultraviolet absorbing layer can be appropriately set, but from the viewpoint of realizing a thin film while exhibiting sufficient ultraviolet absorbing properties and of bending resistance, it may be 1.5 μm or more, or 2 μm or more, or on the other hand, 7 μm or less, or 5 μm or less. Note that the thickness of the alignment layer / ultraviolet absorbing layer here includes the thickness of the penetration region.

[0141] 2. Positive A Layer The positive A layer is a layer that satisfies the relationship Nx>Ny≒Nz. The positive A layer preferably contains a liquid crystalline component as the main component. The main component means that the main component accounts for 50% by mass or more of the total solid content of the positive A layer, preferably 70% by mass or more, and more preferably 90% by mass or more.

[0142] The liquid crystal component forming the positive A layer preferably contains a polymerizable liquid crystal compound having a polymerizable functional group in the molecule. The polymerizable functional group in the liquid crystal component facilitates reaction in the penetration region in combination with a large amount of UV absorber in the alignment layer / UV absorbing layer, which facilitates improved adhesion at the interface. Furthermore, the polymerizable functional group allows the liquid crystal compound to be polymerized and fixed, resulting in excellent alignment stability and less change in retardation over time. The polymerizable liquid crystal compound more preferably has two or more polymerizable functional groups in the molecule. Having two or more polymerizable functional groups can further stabilize the three-dimensional alignment of the liquid crystal compound and suppress change in retardation over time.

[0143] Examples of polymerizable functional groups include those that polymerize under the action of ionizing radiation such as ultraviolet light or electron beams, or heat. These polymerizable functional groups include radically polymerizable functional groups. Representative examples of radically polymerizable functional groups include functional groups having at least one addition-polymerizable ethylenically unsaturated double bond, and specific examples include vinyl groups, acryloyl groups, methacryloyl groups, acryloyloxy groups, and methacryloyloxy groups, each with or without a substituent. Furthermore, commonly known cationically polymerizable functional groups may also be used as the polymerizable functional group, and specific examples include alicyclic ether groups (epoxy groups, oxetanyl groups, etc.), cyclic acetal groups, cyclic lactone groups, cyclic iminoether groups, cyclic thioether groups, spiro orthoester groups, and vinyloxy groups. Among these, alicyclic ether groups and vinyloxy groups are preferred, and epoxy groups, oxetanyl groups, and vinyloxy groups are more preferred.

[0144] Furthermore, it is particularly preferable that the liquid crystal compound has a polymerizable functional group at its terminal. By using such a liquid crystal compound, for example, the terminals of the liquid crystal compound can be polymerized with each other to be three-dimensionally aligned, thereby providing a stable positive A layer with excellent optical properties.

[0145] The liquid crystal compound may be used alone or in combination of two or more. When using one liquid crystal compound alone, the one liquid crystal compound is preferably a polymerizable liquid crystal compound. When using two or more liquid crystal compounds in combination, it is preferable that at least one liquid crystal compound is a polymerizable liquid crystal compound, and it is more preferable that all liquid crystal compounds are polymerizable liquid crystal compounds.

[0146] The liquid crystal compound of the positive A layer may be a liquid crystal compound that exhibits homogeneous alignment. The liquid crystal compound capable of homogeneous alignment may be a material made of a liquid crystal polymer or a material made of a liquid crystal monomer. Homogeneous alignment refers to a state in which the molecular long axes of the liquid crystal compound are aligned horizontally. The positive A layer preferably exhibits a smectic phase. Here, the smectic phase refers to a state in which molecules aligned in one direction have a phase structure. The liquid crystal compound of the positive A layer may be a liquid crystal monomer, and its molecular weight may be 250 to 2000, because this tends to improve the solubility and alignment of the liquid crystal compound and facilitates the formation of the penetration region in the alignment layer / ultraviolet absorbing layer.

[0147] Examples of the liquid crystal compound for the positive A layer include discotic liquid crystal materials and rod-shaped liquid crystal materials. A general-purpose material can be used for the liquid crystal compound for the positive A layer, and examples include the compound represented by general formula (I) described in JP-A-2008-297210, the compound represented by general formula (1) described in JP-A-2010-84032, the liquid crystal compound A0 described in JP-A-2016-53709, and the polymerizable liquid crystal compound described in paragraphs 0057 to 0064 of WO 2018 / 003498. The liquid crystal compound for the positive A layer can also be the compounds represented by the following formulas (1) to (19).

[0148]

[0149]

[0150]

[0151] In order to form a positive A layer exhibiting reverse dispersion, a polymerizable liquid crystal compound exhibiting reverse dispersion may be used. Specific examples of the polymerizable liquid crystal compound in the positive A layer include the polymerizable liquid crystal compound represented by the following general formula (1) described in Japanese Patent No. 6473537, the liquid crystal compound represented by general formula (II) in International Publication No. WO2017 / 043438, and the polymerizable liquid crystal compounds described in Japanese Patent Nos. 5463666, 4186981, 5962760, 5826759, 6568103, 6427340, JP-A-2016-166344, and Recueil des Travaux Chimiques des Pays-Bas (1996), 115 (6), 321-328.

[0152] (The symbols in the general formula (1) are as described in Japanese Patent No. 6473537.)

[0153] Examples of the polymerizable liquid crystal composition used in the positive A layer include the compositions described in paragraphs 0133 to 0143 of JP-A-2014-174468 and the compositions described in paragraphs 0083 to 0092 of Japanese Patent No. 6739621.

[0154] It is preferable that the Re(450), Re(550), and Re(650) of the positive A layer satisfy the relationship of the following formula (B). That is, the positive A layer may have reverse dispersion. By using a positive A layer with reverse dispersion that satisfies the relationship of the following formula (B), it is easy to improve visibility and anti-reflection properties in wavelength ranges outside 550 nm. Re(450)<Re(550)<Re(650) (B) The Re(450), Re(550), and Re(650) of the positive A layer are not particularly limited, but when the positive A layer is a λ / 4 retardation layer, they are preferably in the following ranges. The positive A layer is preferably a λ / 4 retardation layer. The lower limit of the in-plane retardation of the λ / 4 retardation layer is preferably 100 nm or more, more preferably 110 nm or more, and even more preferably 135 nm or more. The upper limit of the in-plane retardation of the λ / 4 retardation layer is preferably 180 nm or less, more preferably 160 nm or less, and even more preferably 150 nm or less. By setting the in-plane retardation of the λ / 4 retardation layer within the above range, when the λ / 4 retardation layer is combined with a polarizer, the circular polarizer is likely to exhibit an anti-reflection function.

[0155] The composition for forming a positive A layer may contain, in addition to the liquid crystal compound, a polymerization initiator, a leveling agent, an alignment promoter, etc. The composition for forming a positive A layer may be a polymerizable liquid crystal composition.

[0156] The aligned liquid crystal compound is preferably fixed while maintaining the aligned state by a polymerization reaction. Polymerization reactions include thermal polymerization reactions using a thermal polymerization initiator and photopolymerization reactions using a photopolymerization initiator. Among these, photopolymerization reactions are preferred. Examples of photopolymerization initiators include α-carbonyl compounds (see U.S. Pat. Nos. 2,367,661 and 2,367,670), acyloin ethers (see U.S. Pat. No. 2,448,828), α-hydrocarbon-substituted aromatic acyloin compounds (see U.S. Pat. No. 2,722,512), polynuclear quinone compounds (see U.S. Pat. Nos. 3,046,127 and 2,951,758), combinations of triarylimidazole dimers and p-aminophenyl ketones (see U.S. Pat. No. 3,549,367), acridine and phenazine compounds (see JP-A-60-105667 and U.S. Pat. No. 4,239,850), and oxadiazole compounds (see U.S. Pat. No. 4,212,970).

[0157] When the content of the polymerization initiator is low, poor curing tends to occur, and when the content of the polymerization initiator is high, the alignment of the liquid crystal compound tends to decrease. Therefore, the amount of the polymerization initiator used, relative to the total solid content of the composition for forming a positive A layer, has a lower limit of preferably 0.01 mass % or more, more preferably 0.50 mass % or more, and an upper limit of preferably 20.00 mass % or less, more preferably 10.00 mass % or less.

[0158] As the leveling agent, fluorine-based leveling agents and silicone-based leveling agents can be mentioned, and conventionally known leveling agents can be appropriately selected and used.When the content of the leveling agent is low, sufficient leveling tends to be insufficient, and when the content of the leveling agent is high, problems such as reduced defoaming tend to occur.For this reason, the content of the leveling agent is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and the upper limit is preferably 2.00% by mass or less, more preferably 1.00% by mass or less, based on the total solid content of the composition for forming a positive A layer.

[0159] A solvent may be used in the polymerizable liquid crystal composition used in the positive A layer. As with the alignment layer / ultraviolet absorbing layer of the present disclosure, the solvent may be appropriately selected from among conventionally known solvents capable of dissolving or dispersing the components constituting the positive A layer. The solvent may be appropriately selected from those that easily dissolve the alignment layer / ultraviolet absorbing layer so as to facilitate the formation of the permeation region, and examples of the solvent include N-methylpyrrolidone, tetrahydrofuran, and cyclohexanone. The solids concentration of the polymerizable liquid crystal composition used in the positive A layer is not particularly limited, but may be 1% by mass to 40% by mass, 5% by mass to 30% by mass, or 10% by mass to 25% by mass.

[0160] The positive A layer can be formed, for example, by applying a polymerizable liquid crystal composition onto the alignment layer / ultraviolet absorbing layer, heating the composition to a phase transition temperature to align the liquid crystalline component, and then irradiating the coating film of the polymerizable liquid crystal composition in which the liquid crystalline component has been aligned with ultraviolet light.

[0161] In the step of aligning the liquid crystal component, the method for forming a coating film of the polymerizable liquid crystal composition and the method for heating to the phase transition temperature may be any conventionally known method and are not particularly limited. The coating method and heating method may be the same as those used in the method for producing the alignment layer / ultraviolet absorbing layer. The heating temperature varies depending on the substances in the composition and must be adjusted appropriately. For example, the heating temperature may be within a range of 40°C to 200°C, and may further be within a range of 40°C to 150°C. The heating time may also be adjusted appropriately, and may be within a range of, for example, 10 seconds to 30 minutes, and further within a range of 30 seconds to 10 minutes.

[0162] In order to ensure that the alignment layer / UV absorbing layer includes a region at the interface on the positive A layer side where the liquid crystalline component contained in the positive A layer has permeated, for example, the amount of crosslinker and acid catalyst in the alignment layer / UV absorbing layer-forming composition, or the heating temperature and heating time in the alignment layer / UV absorbing layer-forming step can be controlled. Furthermore, when forming the positive A layer, the solvent type and solids concentration of the polymerizable liquid crystal composition for forming the positive A layer, and the heating temperature and heating time in the positive A layer-forming step can be controlled. For example, reducing the amount of crosslinker and acid catalyst in the alignment layer / UV absorbing layer-forming composition reduces the hardness of the alignment layer / UV absorbing layer, making it easier to form a permeation region. Furthermore, reducing the heating temperature and heating time can also facilitate the formation of a permeation region through a similar effect. Furthermore, using a solvent with high solubility, such as N-methylpyrrolidone or tetrahydrofuran, for the polymerizable liquid crystal composition for forming the positive A layer facilitates permeation into the alignment layer / UV absorbing layer, making it easier to form a permeation region. Furthermore, by reducing the solids concentration of the polymerizable liquid crystal composition for forming a positive A layer, the amount of solvent that penetrates increases, making it easier to form a permeation region. Furthermore, by lowering the heating temperature and slowing the evaporation rate of the solvent when forming the positive A layer, the time for the solvent to penetrate can be controlled to form a permeation region. Furthermore, by increasing the heating time, the time for the liquid crystal compound in the liquid crystal composition for forming a positive A layer to penetrate can be increased, making it easier to control the formation of a permeation region.

[0163] When the coating film of the polymerizable liquid crystal composition in which the liquid crystalline component is aligned is irradiated with ultraviolet light, a polymerization reaction occurs, polymerizing the polymerizable groups of the polymerizable liquid crystal compound contained in the positive A layer. Because the alignment layer / UV absorbing layer has the predetermined ultraviolet absorption characteristics, when the coating film of the polymerizable liquid crystal composition in which the liquid crystalline component is aligned is irradiated with ultraviolet light, the ultraviolet absorber contained in the alignment layer / UV absorbing layer in large quantities generates heat. This promotes the polymerization reaction in the permeation region of the liquid crystalline component in the alignment layer / UV absorbing layer, more firmly bonding the positive A layer and the alignment layer / UV absorbing layer in the permeation region, resulting in high adhesion and improved adhesion under humidity and heat. Conventional UV irradiation methods may be used. UV light emitted from an ultra-high pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc, a xenon arc, a metal halide lamp, or the like can be used for UV irradiation. For example, unpolarized UV light containing an emission line at 365 nm may be irradiated using an Hg—Xe lamp in a nitrogen atmosphere. The amount of ultraviolet light irradiation may be appropriately selected, and the integrated exposure amount at an ultraviolet light wavelength of 365 nm is, for example, 100 mJ / cm ２ More than 1000mJ / cm ２ It may be in the following range:

[0164] The lower limit of the thickness of the positive A layer is preferably 0.1 μm or more, more preferably 0.5 μm or more, and even more preferably 1.5 μm or more. The upper limit of the thickness of the positive A layer is preferably 5.0 μm or less, more preferably 4.0 μm or less, and even more preferably 3.0 μm or less. By setting the thickness of the positive A layer within the above range, the optical laminate can be made thin, and the in-plane retardation of the λ / 4 retardation layer as the positive A layer can easily be set within the above range.

[0165] 3. Substrate The optical laminate of the present disclosure may include a substrate 4, as shown in FIG. 2, for example. Examples of substrates in optical laminates include glass substrates, metal foils, and resin substrates. Among these, the substrate is preferably transparent and can be appropriately selected from conventionally known transparent substrates. Examples of transparent substrates include glass substrates, as well as transparent resin substrates formed using resins such as acetylcellulose-based resins such as triacetylcellulose, polyester-based resins such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, and polylactic acid, olefin-based resins such as polypropylene, polyethylene, and polymethylpentene, acrylic resins, polyurethane-based resins, vinyl chloride-based resins, polyamide-based resins such as nylon and aromatic polyamide, polyimide-based resins, vinylidene chloride-based resins, vinyl alcohol-based resins, vinyl butyral-based resins, polyethersulfone, polycarbonate, polysulfone, polyether, polyether ketone, acrylonitrile, methacrylonitrile, cycloolefin polymers, and cycloolefin copolymers. Among these, cellulose derivatives and polyethylene terephthalate are preferably used in this embodiment. Cellulose derivatives are particularly excellent in optical isotropy and can therefore provide excellent optical properties. Polyethylene terephthalate is also preferred because of its high transparency and excellent mechanical properties.

[0166] The transparent substrate preferably has a transmittance of 80% or more, more preferably 90% or more, in the visible light region. The transmittance of the transparent substrate can be measured according to JIS K7361-1 (Test method for total light transmittance of plastic transparent materials).

[0167] The substrate serves as a support for, for example, the positive A layer and the alignment layer / ultraviolet absorbing layer. However, in consideration of reducing the thickness of the image display device, the substrate is preferably peelable. In other words, the substrate is preferably peelable so that it does not remain in the image display device. For example, if the positive A layer and the alignment layer / ultraviolet absorbing layer are bonded to another member of the image display device (e.g., a polarizer), and then the peelable substrate is peeled off, this can contribute to reducing the thickness of the image display device. Examples of the peelable substrate include the transparent resin substrate itself, or the transparent resin substrate whose surface has been subjected to a release treatment with a general-purpose release agent or the like.

[0168] The thickness of the substrate is not particularly limited as long as it is within a range that can impart the necessary self-supporting properties depending on the application of the optical laminate, etc. As for the thickness of the substrate, from the viewpoint of handleability, the lower limit is preferably 15 μm or more, more preferably 25 μm or more, even more preferably 30 μm or more, and even more preferably 40 μm or more. From the viewpoint of lengthening during the production of the optical laminate, the upper limit is preferably 150 μm or less, more preferably 125 μm or less, and even more preferably 100 μm or less. When the substrate does not remain in the image display device, the thickness of the substrate is preferably 15 μm or more and 100 μm or less. Furthermore, when the substrate remains in the image display device, the thickness of the substrate is preferably 15 μm or more and 60 μm or less. In particular, when the optical laminate is applied to a foldable image display device, a rollable image display device, etc., it is preferable to set the thickness of the substrate to the above range (15 μm or more and 60 μm or less) in consideration of the balance between flexibility and strength.

[0169] The configuration of the substrate used in this embodiment is not limited to a configuration consisting of a single layer, and may have a configuration in which multiple layers are laminated. When multiple layers are laminated, layers of the same composition may be laminated, or multiple layers of different compositions may be laminated.

[0170] 4. Other Layers The optical laminate of the present disclosure may have other layers as long as the effects of the present disclosure are not impaired. Examples of other layers include a retardation layer different from the positive A layer, such as a positive C layer, a positive A layer different from the positive A layer, a gas barrier layer, an adhesive layer, a surface protective layer, and other alignment films for retardation layers. These other layers can be appropriately selected from conventionally known layers.

[0171] 5. Physical Properties of Optical Laminate The optical laminate of the present disclosure includes a positive A layer and an alignment layer / UV absorbing layer directly in contact with the positive A layer, wherein the optical laminate has a transmittance of 1.0% or less at a wavelength of 380 nm and a transmittance of 20.0% or less at a wavelength of 400 nm. The transmittance of the optical laminate at a wavelength of 380 nm may be 0.5% or less, 0.3% or less, or even 0.1% or less, from the viewpoints of blocking blue light and suppressing photodegradation of the positive A layer. Furthermore, the transmittance of the optical laminate at a wavelength of 400 nm may be 10.0% or less, 5.0% or less, or even 3.0% or less, from the viewpoint of further suppressing photodegradation of display elements such as organic light-emitting elements. The transmittance of the optical laminate is determined by measuring the wavelength range of 250 nm to 800 nm at 1 nm intervals using a UV-visible spectrophotometer.

[0172] In the optical laminate of the present disclosure, the in-plane retardation Re of the laminate of the positive A layer and the alignment layer / ultraviolet absorbing layer at a wavelength of 550 nm may be 110 nm or more, and the total thickness of the positive A layer and the alignment layer / ultraviolet absorbing layer may be 1.6 μm or more and 12.0 μm or less. Furthermore, the in-plane retardation Re at a wavelength of 550 nm may be 120 nm or more, and even 135 nm or more. The upper limit of the in-plane retardation Re may be 180 nm or less, further may be 160 nm or less, or may be 150 nm or less. The total thickness of the positive A layer and the alignment layer / ultraviolet absorbing layer is preferably 2.5 μm or more, more preferably 3.5 μm or more. Furthermore, the total thickness of the positive A layer and the alignment layer / ultraviolet absorbing layer is preferably 10.0 μm or less, more preferably 8.0 μm or less, and further preferably 7.0 μm or less from the viewpoint of thinning.

[0173] In the optical laminate of the present disclosure, when the adhesion between the positive A layer and the alignment layer / ultraviolet absorbing layer directly contacting the positive A layer is evaluated by the following Adhesion Test 1, the number of cross-cut portions in the lattice pattern that do not peel off is preferably 90% or more, more preferably 95% or more, and even more preferably 100%. (Adhesion Test 1) In JIS K5600-5-6:1999, except that the number of cuts in step 7.1.3 was changed from 6 to 11, and the tape peeling in step 7.2.6 was changed to be repeated 5 times using new tape each time, 11 cuts were made from the alignment layer / ultraviolet absorbing layer side to the positive A layer in each direction of the lattice pattern, with the cut intervals being 1 mm, to evaluate the adhesion between the positive A layer and the alignment layer / ultraviolet absorbing layer. In addition, in the Adhesion Test 1, the number of cuts in the procedure 7.1.3 was increased for more detailed evaluation in JIS K5600-5-6:1999, and in order to evaluate higher adhesion, the tape peeling in the procedure 7.2.6 was repeated five times using a new tape each time.

[0174] In the optical laminate of the present disclosure, a laminate of a positive A layer and an alignment layer / ultraviolet absorbing layer directly in contact with the positive A layer is subjected to a moist heat resistance test (temperature 60°C, relative humidity 95%, 500 hours), and then the adhesion between the positive A layer and the alignment layer / ultraviolet absorbing layer is evaluated by the following adhesion test 2. When the number of cross-cut portions in the grid pattern that do not peel off is preferably 90% or more, more preferably 95% or more, and even more preferably 100%. (Adhesion Test 2) The adhesion between the positive A layer and the alignment layer / ultraviolet absorbing layer is evaluated by making 11 cuts in each direction of the grid pattern from the alignment layer / ultraviolet absorbing layer side to the positive A layer, with a cut interval of 1 mm, in accordance with JIS K5600-5-6:1999, except that the number of cuts in step 7.1.3 in JIS K5600-5-6:1999 is changed from 6 to 11. In the adhesion test 2, the number of cuts in step 7.1.3 was increased in order to perform a more detailed evaluation in accordance with JIS K5600-5-6:1999.

[0175] The optical laminate of the present disclosure can be thinned by laminating a positive A layer directly on the alignment layer / ultraviolet absorbing layer. The optical laminate of the present disclosure can be suitably used as an optical component with excellent ultraviolet absorbing function for various image display devices that are intended to be thin. The optical laminate including the positive A layer of the present disclosure is preferably used as a circular polarizer in a form in which a λ / 4 retardation plate and a linear polarizer are combined in an organic electroluminescence display device, for example, and is preferred from the viewpoint of being used as an external light antireflection film, and is also suitably used as a part of a polarizer compensation film in a liquid crystal display device.

[0176] I-B. Transfer Laminate The transfer laminate of the present disclosure is a transfer laminate provided for transferring the positive A layer and the alignment layer / ultraviolet absorbing layer, which includes a support that supports the positive A layer and the alignment layer / ultraviolet absorbing layer in a peelable manner on the alignment layer / ultraviolet absorbing layer side of the optical laminate of the present disclosure.

[0177] According to the transfer laminate of this embodiment, for example, the positive A layer and the alignment layer / ultraviolet absorbing layer of the optical laminate of the present disclosure, which are thin films that do not include a substrate, can be transferred to any other optical member, etc. According to the transfer laminate of this embodiment, for example, it is possible to provide an optical laminate 10 that does not include a substrate and is composed only of the positive A layer and the alignment layer / ultraviolet absorbing layer, as shown in the example of Figure 1. As long as it does not include a substrate and at least the positive A layer and the alignment layer / ultraviolet absorbing layer can be peeled off, other layers may be further laminated on the positive A layer and the alignment layer / ultraviolet absorbing layer that are used to transfer the transfer laminate.

[0178] The layer structure of the transfer laminate will be described with reference to the drawings. FIG. 4 shows one embodiment of the transfer laminate of the present disclosure. One embodiment of the transfer laminate 15 illustrated in FIG. 4 comprises a support 11, an alignment layer / ultraviolet absorbing layer 1 directly in contact with the support, and a positive A layer 2 directly in contact with the alignment layer / ultraviolet absorbing layer 1, and the alignment layer / ultraviolet absorbing layer 1 includes a region 3 in which the liquid crystalline component contained in the positive A layer has permeated. In the transfer laminate illustrated in FIG. 4, the peel strength between the support 11 and the alignment layer / ultraviolet absorbing layer 1 is smaller than the peel strength between the alignment layer / ultraviolet absorbing layer 1 and the positive A layer 2. This is an example of a transfer laminate that can be peeled at the interface between the support 11 and the alignment layer / ultraviolet absorbing layer 1, allowing the alignment layer / ultraviolet absorbing layer 1 and the positive A layer 2 to be transferred.

[0179] This embodiment will be described below, but the configuration of the alignment layer / ultraviolet absorbing layer, the positive A layer, and other layers other than the support can be the same as that of the above-mentioned "IA. Optical laminate," so the description here will be omitted.

[0180] The support for the transfer laminate can also be the same as the substrate described above in "I-A. Optical Laminate." Because the alignment layer / ultraviolet absorbing layer 1 and the positive A layer 2 of the present disclosure have high adhesion as described above and therefore high peel strength, the peel strength between the support 11 and the alignment layer / ultraviolet absorbing layer 1 can be easily made smaller than the peel strength between the alignment layer / ultraviolet absorbing layer 1 and the positive A layer 2. Furthermore, to make the peel strength between the support 11 and the alignment layer / ultraviolet absorbing layer 1 smaller than the peel strength between the alignment layer / ultraviolet absorbing layer 1 and the positive A layer 2, for example, a release treatment may be applied to the surface of the support, or a release layer may be formed. This can enhance the releasability of the support, making it easier to make the peel strength between the support and the alignment layer / ultraviolet absorbing layer smaller than the peel strength between the alignment layer / ultraviolet absorbing layer and the positive A layer. Examples of release treatments include surface treatments such as fluorine treatment and silicone treatment. Examples of materials for the release layer include fluorine-based release agents, silicone-based release agents, and wax-based release agents. The release layer may be formed, for example, by applying a release agent by a coating method such as dip coating, spray coating, or roll coating.

[0181] The support used in the transfer laminate may or may not have flexibility, but is preferably flexible because it facilitates peeling of the substrate. The thickness of the support used in the transfer laminate is preferably in the range of 20 μm or more and 200 μm or less in the case of a sheet of the above material, in order to strike a balance between sufficient self-supporting strength and flexibility that can be adapted to the manufacturing and transfer process of the transfer laminate of this embodiment.

[0182] The positive A layer and the alignment layer / UV absorbing layer that can be provided from the transfer laminate of the present disclosure are suitable for use in the same applications as the optical laminate, can be transferred to optical components for various display devices, and are suitable for providing thin-film optical components. The positive A layer and the alignment layer / UV absorbing layer that can be provided from the transfer laminate of the present disclosure may be laminated on a polarizer, for example, via an adhesive layer (adhesive layer). Furthermore, the positive A layer and the alignment layer / UV absorbing layer that can be provided from the transfer laminate of the present disclosure may be transferred to the polarizer side of a laminate in which a polarizer and a λ / 4 retardation plate are laminated in this order via an adhesive layer (adhesive layer), or may be transferred to the polarizer side of a laminate in which a polarizer, a λ / 4 retardation plate, and a positive C layer are laminated in this order via an adhesive layer (adhesive layer).

[0183] I-C. Polarizing Plate The present disclosure provides a polarizing plate comprising the optical laminate of the present disclosure and a polarizer. The polarizing plate of the present disclosure may be a polarizing plate comprising a polarizer and the optical laminate of the present disclosure as a transparent protective plate located on at least one side of the polarizer. The polarizing plate of this embodiment will be described with reference to the drawings. FIG. 5 is a schematic cross-sectional view showing one embodiment of a polarizing plate. FIG. 6 is a schematic cross-sectional view showing another embodiment of a polarizing plate.

[0184] The polarizing plate 30 in Figures 5 and 6 has a polarizer 20 and a transparent protective plate (21) located on one side of the polarizer, and the transparent protective plate (21) in Figures 5 and 6 is the optical laminate 10 of the present disclosure. In Figure 5, the optical laminate 10 of the present disclosure that is the transparent protective plate (21) represents an embodiment in which the alignment layer / ultraviolet absorbing layer 1 is located farther from the polarizer 20 than the positive A layer 2. In Figure 6, the optical laminate 10 of the present disclosure that is the transparent protective plate (21) represents an embodiment in which the positive A layer 2 is located farther from the polarizer 20 than the alignment layer / ultraviolet absorbing layer 1. Thus, in the polarizing plate of the present disclosure, the lamination orientation in which the optical laminate of the present disclosure is arranged as a transparent protective plate relative to the polarizer is arbitrary and may be any orientation. In particular, in the case of an embodiment in which the alignment layer / ultraviolet absorbing layer 1 is located farther from the polarizer 20 than the positive A layer 2, as shown in Figure 5, a polarizing plate is used so that the alignment layer / ultraviolet absorbing layer is located on the viewing side, thereby protecting the positive A layer and the like from ultraviolet light from external light with a simple configuration, thereby enhancing the effect of improving the light resistance of the polarizing plate. Note that in the polarizing plate of the present disclosure, the polarizer and the transparent protective plate may be bonded together via an adhesive (an adhesive layer is not shown in Figures 5 and 6). In the polarizing plate of the present disclosure, the polarizer and the transparent protective plate located on at least one side of the polarizer may be adjacent to each other via an adhesive layer or may be in direct contact.

[0185] Furthermore, the polarizing plate of the present disclosure is a polarizing plate having a polarizer, a transparent protective plate A located on one side of the polarizer, and a transparent protective plate B located on the other side of the polarizer, and at least one of the transparent protective plate A and the transparent protective plate B may be the optical laminate of the present disclosure. In the polarizing plate of the present disclosure, both the transparent protective plate A and the transparent protective plate B may be the optical laminate of the present disclosure. The polarizing plate of this embodiment will be described with reference to the drawings. Figures 7 and 8 are each a schematic cross-sectional view showing another embodiment of a polarizing plate.

[0186] The polarizing plate 30 in Fig. 7 has a polarizer 20, a transparent protective plate A (21) located on one side of the polarizer, and a transparent protective plate B (22) located on the other side of the polarizer, and the transparent protective plate A (21) in Fig. 7 is the optical laminate 10 of the present disclosure. The polarizing plate 30 in Fig. 8 has a polarizer 20, a transparent protective plate A (21) located on one side of the polarizer, and a transparent protective plate B (22) located on the other side of the polarizer, and the transparent protective plate A (21) and the transparent protective plate B (22) in Fig. 8 are the optical laminate 10 of the present disclosure. Note that in the polarizing plate, the polarizer and the transparent protective plate may be bonded together via an adhesive (an adhesive layer is not shown in Figs. 7 and 8 ).

[0187] 1. Polarizer Examples of polarizers include sheet-type polarizers such as polyvinyl alcohol films, polyvinyl formal films, polyvinyl acetal films, and saponified ethylene-vinyl acetate copolymer films dyed with iodine or the like, and stretched, wire-grid polarizers made of a large number of metal wires arranged in parallel, coated polarizers coated with a lyotropic liquid crystal or a dichroic guest-host material, and multilayer thin-film polarizers. These polarizers may also be reflective polarizers that have the function of reflecting polarized components that are not transmitted.

[0188] 2. Transparent Protective Plate A transparent protective plate is disposed on at least one side of the polarizer. Transparent protective plates may be disposed on both sides of the polarizer. That is, a transparent protective plate A may be disposed on one side of the polarizer and a transparent protective plate B may be disposed on the other side. The transparent protective plate disposed on at least one side of the polarizer may be the optical laminate of the present disclosure. In the case of a polarizing plate having a transparent protective plate A disposed on one side of the polarizer and a transparent protective plate B disposed on the other side of the polarizer, at least one of the transparent protective plates A and B may be the optical laminate of the present disclosure. Both the transparent protective plate A and the transparent protective plate B may be the optical laminate of the present disclosure. Either one of the transparent protective plate A and the transparent protective plate B may be the optical laminate of the present disclosure, and the other may be an optical laminate or a positive A layer different from the optical laminate of the present disclosure. Both transparent protective plate A and transparent protective plate B may include a λ / 4 retardation layer, or one of transparent protective plate A and transparent protective plate B may be the optical laminate of the present disclosure, in which the positive A layer is a λ / 4 retardation layer, and the other may be a positive A layer that is a λ / 4 retardation layer.

[0189] Examples of the transparent protective plate A and the transparent protective plate B other than the optical laminate include plastic films and glass. Examples of the plastic film include acetylcellulose-based resins such as triacetylcellulose, polyester films, polycarbonate films, cycloolefin polymer films, and acrylic films, and stretched films of these are preferred from the viewpoint of mechanical strength. Examples of the glass include alkali glass, nitride glass, soda-lime glass, borosilicate glass, and lead glass. In addition, the glass serving as the transparent protective plate protecting the polarizer may also serve as other components of the image display device (for example, the glass substrate of a liquid crystal display element, the surface plate of the image display device). It is preferable that the polarizer and the transparent protective plate are bonded together via an adhesive. A general-purpose adhesive can be used as the adhesive, and a PVA-based adhesive is preferred.

[0190] When the positive A layer is a λ / 4 retardation layer, it is preferably arranged so that the absorption axis of the polarizer and the slow axis of the positive A layer form an angle of 45°±5°, more preferably 45°±3°, and even more preferably 45°±1°. By arranging them in the above-mentioned angular relationship, it can function as a circular polarizing plate.

[0191] The polarizing plate of the present disclosure is preferably used as a polarizing plate provided on the light exit surface of a display element. Furthermore, when used as described above, it is preferable that the transparent protective plate located farther from the display element than the polarizer is the optical laminate of the present disclosure. Furthermore, within the polarizing plate, the optical laminate of the present disclosure preferably has the alignment layer / ultraviolet absorbing layer located farther from the display element than the positive A layer. By using a polarizing plate so that the alignment layer / ultraviolet absorbing layer of the optical laminate of the present disclosure is located on the viewing side, the positive A layer and the like can be protected from external ultraviolet light with a simple configuration, thereby enhancing the effect of improving the light resistance of the polarizing plate.

[0192] I-D. Display Panel The display panel of the present disclosure comprises the optical laminate of the present disclosure described above on the light-emitting surface of a display element. By comprising the optical laminate of the present disclosure described above on the light-emitting surface of a display element, the display panel of the present disclosure can be imparted with excellent ultraviolet absorption functionality in addition to the optical properties and durability provided by the optical laminate of the present disclosure, thereby improving the lightfastness of the display element. Within the display panel, the optical laminate of the present disclosure described above preferably has the alignment layer / ultraviolet absorption layer located farther from the display element than the positive A layer. This is because a simple configuration can protect the positive A layer and the like from external ultraviolet light, thereby enhancing the effect of improving the lightfastness of the display panel.

[0193] 9 is a schematic cross-sectional view showing an example of a display panel 50 of the present disclosure. The display panel 50 of FIG. 9 has the optical laminate 10 of the present disclosure laminated on the light-emitting surface side of a display element 40.

[0194] When the display element of the display panel is a liquid crystal display element, a backlight (not shown) is required behind the liquid crystal display element. The backlight may be either an edge-lit backlight or a direct-type backlight. Examples of light sources for the backlight include LEDs and CCFLs, but backlights using quantum dots as the light source are preferred because they tend to improve color reproducibility.

[0195] The display panel of the present disclosure may include the polarizing plate of the present disclosure on the light-emitting surface side of the display element. Fig. 10 is a schematic cross-sectional view showing another example of a display panel 50 of the present disclosure. The display panel 50 of Fig. 10 includes the polarizing plate 30 of the present disclosure laminated on the light-emitting surface side of the display element 40.

[0196] The display panel according to the present disclosure may include a polarizer on the light-emitting surface side of a display element, and the polarizing plate according to the present disclosure includes the optical laminate according to the present disclosure as a transparent protective plate located on at least one side of the polarizer. Figures 11 to 15 are each a schematic cross-sectional view showing another example of a display panel 50 according to the present disclosure.

[0197] The display panels 50 of Figures 11 and 12 each show an embodiment in which a polarizing plate 30 of the present disclosure is laminated on the light-emitting surface side of a display element 40, and the optical laminate 10 is located farther from the display element than the polarizer 20. Figure 11 shows an embodiment in which, in the polarizing plate 30, the optical laminate 10 has the alignment layer / ultraviolet absorbing layer 1 located farther from the display element 40 than the positive A layer 2. Figure 12 shows an embodiment in which, in the polarizing plate 30, the optical laminate 10 has the positive A layer 2 located farther from the display element 40 than the alignment layer / ultraviolet absorbing layer 1. In the display panel of the present disclosure, the optical laminate of the present disclosure may be arranged in any direction relative to the polarizer. By adopting such a configuration, blackout can be suppressed when the image display device is viewed through polarized sunglasses. In particular, in the case of an embodiment in which the alignment layer / ultraviolet absorbing layer 1 is located farther from the polarizer 20 than the positive A layer 2, as shown in Figure 11, the alignment layer / ultraviolet absorbing layer is located on the viewing side, thereby protecting the positive A layer 2 and the like from ultraviolet light from outside with a simple configuration, thereby enhancing the effect of improving the light resistance of the display panel.

[0198] The display panel 50 of FIG. 13 illustrates an embodiment in which the polarizing plate 30 of the present disclosure is laminated on the light-emitting surface side of the display element 40, and the polarizer 20 is located farther from the display element than the optical laminate 10. By employing such a configuration, the display panel of the present disclosure can impart an external light anti-reflection function to the image display device. In the polarizing plate 30 of the present disclosure in the display panel 50 of FIG. 13, the lamination direction in which the optical laminate of the present disclosure is disposed relative to the polarizer is arbitrary. Although not shown, in the optical laminate 10 of FIG. 13, the alignment layer / ultraviolet absorbing layer may be located farther from the display element 40 than the positive A layer, or the positive A layer may be located farther from the display element 40 than the alignment layer / ultraviolet absorbing layer.

[0199] The display panel 50 of Figure 14 shows an embodiment in which the polarizing plate 30 of the present disclosure is laminated on the light-emitting surface side of the display element 40. In the polarizing plate 30 of the present disclosure, the optical laminate 10 is located farther from the display element than the polarizer 20 as a transparent protective plate 21, and a positive A layer 24 is provided on the opposite side of the optical laminate 10 relative to the polarizer 20. The positive A layer 24 may be the transparent protective plate 22 located on the other side of the polarizer in the polarizing plate 30 of the present disclosure. Figure 14 shows an embodiment in which the optical laminate 10 of the polarizing plate 30 has the alignment layer / ultraviolet absorbing layer 1 located farther from the display element 40 than the positive A layer 2, but the lamination direction in which the optical laminate of the present disclosure is arranged with respect to the polarizer is arbitrary. Although not shown, in the optical laminate 10 of Figure 14, the positive A layer 2 may be located farther from the display element 40 than the alignment layer / ultraviolet absorbing layer 1. Although not shown, a positive C layer may be further provided on the opposite side of the polarizer 20 with respect to the positive A layer 24 in FIG.

[0200] The display panel 50 of Figure 15 shows an embodiment in which the polarizing plate 30 of the present disclosure is laminated on the light-emitting surface side of the display element 40, and in the polarizing plate 30 of the present disclosure, the optical stack 10 is located farther from the display element than the polarizer 20, and the optical stack 10' of the present disclosure is further provided on the opposite side of the optical stack 10 with respect to the polarizer 20. The optical stack 10' of the present disclosure may be a transparent protective plate 22 located on the other side of the polarizer in the polarizing plate 30 of the present disclosure. Figure 15 shows an embodiment in which, in the polarizing plate 30, the optical stack 10 is located farther from the display element 40 than the positive A layer 2, and the optical stack 10' is located farther from the display element 40 than the positive A layer 2', but the stacking direction in which the optical stacks 10 and 10' of the present disclosure are arranged with respect to the polarizer is arbitrary. Although not shown, a positive C layer may be further provided on the opposite side of the polarizer 20 with respect to the optical laminate 10' of FIG.

[0201] In the display panels of Figures 14 and 15, when the positive A layers 2 and 2' of the optical laminates 10 and 10' are λ / 4 retardation plates and the positive A layer 24 is a λ / 4 retardation plate, the polarizing plate 30 is used as a circular polarizing plate in a form in which a λ / 4 retardation plate and a linear polarizing plate are combined, and when combined with an organic EL display element as the display element 40, it is preferable because it can be used as an external light anti-reflection film, and when combined with a liquid crystal display element as the display element 40, it is suitably used as a part of a polarizing plate compensation film.

[0202] Examples of the display element include a liquid crystal display element, an organic EL display element, an inorganic EL display element, a plasma display element, an electronic paper display element, an LED display element (such as a micro LED), a display element using quantum dots, etc. These display elements may have a touch panel function inside the display element.

[0203] The display panel 50 of the present disclosure may further include a conventionally known layer configuration as long as it includes the optical laminate 10 of the present disclosure or the polarizing plate 30 of the present disclosure on the light-emitting surface side of the display element 40. The display panel 50 of the present disclosure may further include a conventionally known layer configuration, for example, between the display element 40 and the optical laminate 10 or polarizing plate 30 of the present disclosure, or on the surface of the optical laminate 10 or polarizing plate 30 on the side farther from the display element. Examples of such conventionally known configurations include, but are not limited to, those described in JP 2017-72792 A and Japanese Patent No. 7365211 A.

[0204] I-E. Image Display Device The image display device of the present disclosure is not particularly limited as long as it includes the display panel of the present disclosure, but preferably includes the display panel of the present disclosure, a drive control unit electrically connected to the display panel, and a housing that houses these.

[0205] The image display device may be a foldable image display device or a rollable image display device. The image display device may also be an image display device with a touch panel. In the image display device of the present disclosure, the configuration other than the optical laminate may be any appropriately selected known configuration.

[0206] The present disclosure is not limited to the above-described embodiments. The above-described embodiments are merely examples, and any embodiment that has substantially the same configuration as the technical idea described in the claims of the present disclosure and exhibits similar effects is included within the technical scope of the present disclosure.

[0207] II. Second Present Disclosure II-A. Optical Laminate The present disclosure provides an optical laminate comprising a positive A layer and an alignment layer / ultraviolet absorbing layer in direct contact with the positive A layer, wherein the optical laminate has a transmittance of 1.0% or less at a wavelength of 380 nm and a transmittance of 20.0% or less at a wavelength of 400 nm, and satisfies the following condition (1): Condition (1): The change in in-plane retardation ΔRe at a wavelength of 550 nm of the laminate of the positive A layer and the alignment layer / ultraviolet absorbing layer in direct contact with the positive A layer before and after a moist heat resistance test (temperature 60°C, relative humidity 95%, 500 hours) is 3.0 nm or less.

[0208] 16 and 17 are schematic cross-sectional views showing an example of an optical laminate of the present disclosure. The optical laminate 10 shown in Fig. 16 includes a positive A layer 2 and an alignment layer / ultraviolet absorbing layer 1 that is in direct contact with the positive A layer 2. The optical laminate of the present disclosure may further include a substrate. The optical laminate 10 shown in Fig. 17 includes a substrate 4, an alignment layer / ultraviolet absorbing layer 1 that is in direct contact with the substrate, and a positive A layer 2 that is in direct contact with the alignment layer / ultraviolet absorbing layer 1.

[0209] In one embodiment of the optical laminate, the alignment layer / ultraviolet absorbing layer 1, the positive A layer 2, and another functional layer may be laminated in this order, and may be laminated with another positive C layer or a positive A layer via an adhesive, for example (not shown). Furthermore, in the optical laminate of the present disclosure, since the thickness after production can be reduced, the substrate 4 may be peeled off after production, so that the substrate does not need to be included as shown in FIG.

[0210] The optical laminate of the present disclosure is an optical laminate comprising a positive A layer and an alignment layer / ultraviolet absorbing layer in direct contact with the positive A layer, wherein the optical laminate has a transmittance of 1.0% or less at a wavelength of 380 nm and a transmittance of 20.0% or less at a wavelength of 400 nm, and has the properties that satisfy the above-mentioned condition (1), thereby having excellent ultraviolet absorption ability and excellent moist heat adhesion, and contributing to thinning and improved productivity. In the optical laminate of the present disclosure, the alignment layer / ultraviolet absorbing layer in direct contact with the positive A layer contains a large amount of ultraviolet absorber to an extent that it exhibits predetermined ultraviolet absorption properties, and the change ΔRe in in-plane retardation of the optical laminate before and after a specific moist heat resistance test is controlled to be small, not more than a predetermined value. By controlling the change in in-plane retardation ΔRe before and after the moist heat resistance test to a predetermined value or less, it is estimated that the UV absorber contained in large amounts does not bleed out into the positive A layer under moist heat conditions, and fluctuations in the liquid crystalline component at the interface between the alignment layer / UV absorbing layer and the positive A layer can be suppressed. Furthermore, it is estimated that the protective function in moist heat environments provided by the inclusion of a large amount of UV absorber also improves the moist heat adhesion through a synergistic effect of suppressing fluctuations in the liquid crystalline component at the interface due to moist heat. The optical laminate of the present disclosure has excellent UV absorption ability, and therefore can block blue light, suppress eye damage, and improve the light resistance of the optical laminate. Furthermore, the optical laminate of the present disclosure has good adhesion between the positive A layer and the alignment layer / UV absorbing layer directly laminated, eliminating the need for a separate UV absorbing layer as in the prior art. This allows for a thinner thickness, streamlining the manufacturing process, and improving productivity.

[0211] In the optical laminate of the present disclosure, the photo-alignment component may be present in a relatively larger amount at the interface on the positive A layer side in the thickness direction of the alignment layer / ultraviolet absorbing layer than at the surface on the side not in contact with the positive A layer. When the photo-alignment component is unevenly distributed in the thickness direction of the alignment layer / ultraviolet absorbing layer so that it is relatively more abundant at the interface on the positive A layer side, even if the photo-alignment component is present in a small amount in the alignment layer / ultraviolet absorbing layer, the photo-alignment component is sufficiently present on the surface on the positive A layer side, thereby achieving liquid crystal alignment ability to horizontally align the positive A layer. On the other hand, the alignment layer / ultraviolet absorbing layer can contain a large amount of ultraviolet absorber on the side not in contact with the positive A layer, thereby achieving excellent ultraviolet absorption ability. When the photo-alignment component is unevenly distributed in the thickness direction of the alignment layer / ultraviolet absorbing layer so that it is relatively more abundant at the interface on the positive A layer side, both excellent alignment ability on the positive A layer side and excellent ultraviolet absorption ability can be achieved with a thinner film. Furthermore, if the photo-alignment component is unevenly distributed so that it is relatively abundant at the interface on the positive A layer side, excellent alignment ability can be exhibited, and therefore the manufacturing process of the positive A layer can be adjusted to milder conditions. Also, if the photo-alignment component is unevenly distributed so that it is relatively abundant at the interface on the positive A layer side, there is an advantage that the liquid crystal alignment ability is less likely to be impaired even when a third additive is added to the alignment layer / ultraviolet absorbing layer to add further functionality.

[0212] The components included in the optical laminate are described in detail below. 1. Alignment Layer / UV Absorbing Layer The alignment layer / UV absorbing layer 1 of the present disclosure is a layer that exhibits the predetermined UV absorbing ability, but also has the liquid crystal alignment ability to horizontally align the positive A layer 2 because it is in direct contact with the positive A layer 2. The alignment layer / UV absorbing layer 1 of the present disclosure may contain a photoalignment component and a UV absorber.

[0213] The alignment layer / UV absorbing layer 1 of the present disclosure is not particularly limited, but may be a cured product of a thermosetting composition containing a photoalignment component, a UV absorber, and a thermal crosslinker, as this layer is more likely to satisfy the above-mentioned characteristics. At least one of the photoalignment component and the UV absorber may have a thermal crosslinking group capable of reacting with the thermal crosslinker. The UV absorber typically contains a hydroxy group that functions as a thermal crosslinking group. From the viewpoints of photoalignment, suppression of bleed-out, and improving adhesion under humid and hot conditions, both the photoalignment component and the UV absorber may have a thermal crosslinking group. When the alignment layer / UV absorbing layer 1 is a cured product of a thermosetting composition containing a photoalignment component, a UV absorber, and a thermal crosslinker, the crosslinked structure improves the heat resistance and solvent resistance of the film, resulting in increased durability. When the alignment layer / UV absorbing layer 1 is a cured product of a thermosetting composition containing a photoalignment component, a UV absorber, and a thermal crosslinker, it is less likely to harden and is more flexible, and its curability is easier to control, compared to when it is a cured product of a photocurable composition. Furthermore, by curing the UV absorber, the photo-alignment component is fixed on the surface of the alignment layer / UV absorbing layer, making it less likely to be disturbed under the conditions for forming the positive A layer. Therefore, on the surface side of the alignment layer / UV absorbing layer, the photo-alignment component is more likely to cause the cured film to function as an alignment layer by irradiation with polarized light, and it is more likely to function as an alignment layer / UV absorbing layer. Furthermore, when the alignment layer / UV absorbing layer 1 is a cured product of a thermosetting composition containing a photo-alignment component, a UV absorber, and a thermal crosslinking agent, the alignment layer / UV absorbing layer and the positive A layer are directly laminated with good adhesion, so the thickness can be reduced, and the alignment layer / UV absorbing layer is more likely to have appropriate flexibility, making it easier to achieve good bending resistance.

[0214] 1-1. Photo-alignment component Examples of the photo-alignment component include a compound containing a photo-alignment group as an alignment portion, or a polymer having a photo-alignment structural unit containing a photo-alignment group in its side chain. Even when mixed with an ultraviolet absorber, the photo-alignment property in the alignment layer / ultraviolet absorbing layer 1 tends to be good, and in terms of solubility in solvents, a photo-alignment polymer having a photo-alignment structural unit containing a photo-alignment group in its side chain may be used. The photo-alignment component used in the second present disclosure may be the same as the photo-alignment component described in "1-1. Photo-alignment component" of the first present disclosure.

[0215] 1-2. Ultraviolet Absorber The ultraviolet absorber used in the present disclosure may have a lower limit of the maximum absorption wavelength of 350 nm or more, or 365 nm or more, and may have an upper limit of the maximum absorption wavelength of 405 nm or less, or 403 nm or less. The ultraviolet absorber used in the second present disclosure may be the same as the ultraviolet absorber described in "1-2. Ultraviolet Absorber" of the first present disclosure.

[0216] A polymeric material may be used as the UV absorber. Using a UV-absorbing polymer that is polymerized at the time of addition to the composition for the alignment layer and UV-absorbing layer makes it easier to suppress fluctuations in the retardation of the positive A layer under humid heat conditions, improve adhesion to the positive A layer and adhesion under humid heat conditions, and facilitate the development of liquid crystal alignment ability. It is presumed that using a UV-absorbing polymer in the composition for the alignment layer and UV-absorbing layer suppresses bleeding out of the UV absorber into the directly contacting positive A layer, and the alignment layer and UV-absorbing layer functions as a good protective layer against humid heat resistance tests, making it easier to suppress fluctuations in the retardation of the positive A layer under humid heat conditions and improve adhesion to the positive A layer and adhesion under humid heat conditions. The UV-absorbing polymer used in the second present disclosure may be the same as the UV-absorbing polymer described in "1-2. UV Absorber" of the first present disclosure.

[0217] 1-3. Thermal Crosslinking Agent When the alignment layer / UV absorbing layer is a cured product of a thermosetting composition containing a photoalignment component, an UV absorber, and a thermal crosslinking agent, a thermal crosslinking agent is used to form the alignment layer / UV absorbing layer. The thermal crosslinking agent used in the second present disclosure may be the same as the thermal crosslinking agent described in "1-3. Thermal Crosslinking Agent" of the first present disclosure.

[0218] 1-4. Acid or Acid Generator When the alignment layer / ultraviolet absorbing layer is a cured product of the thermosetting composition, the thermosetting composition may contain an acid or an acid generator. The acid or acid generator used in the second present disclosure may be the same as the acid or acid generator described in "1-4. Acid or Acid Generator" in the first present disclosure.

[0219] 1-5. Other Components The composition for alignment layer / ultraviolet absorbing layer used in the alignment layer / ultraviolet absorbing layer may contain other components. The other components used in the second present disclosure may be the same as the other components described in "1-5. Other Components" in the first present disclosure.

[0220] 1-6. Formation of Alignment Layer and UV Absorbing Layer The alignment layer and UV absorbing layer of the present disclosure can be formed, for example, by preparing a composition for alignment layer and UV absorbing layer (coating liquid) by dissolving or diluting the components constituting the alignment layer and UV absorbing layer as described above in a solvent, and then applying the composition onto a support and drying it. The formation of the alignment layer and UV absorbing layer in the second present disclosure may be similar to the formation of the alignment layer and UV absorbing layer described in "1-6. Formation of Alignment Layer and UV Absorbing Layer" of the first present disclosure.

[0221] 1-7. Configuration of the alignment layer and ultraviolet absorbing layer The alignment layer and ultraviolet absorbing layer of the present disclosure may be a film that contains an ultraviolet absorber and is cured in a state in which the photoalignment group of the photoalignment component present on the surface has a photodimerized structure or a photoisomerized structure. The configuration of the alignment layer and ultraviolet absorbing layer in the second present disclosure may be the same as the configuration of the alignment layer and ultraviolet absorbing layer described in "1-7. Configuration of the alignment layer and ultraviolet absorbing layer" of the first present disclosure.

[0222] In particular, when the alignment layer / ultraviolet absorbing layer is analyzed by time-of-flight secondary ion mass spectrometry (TOF-SIMS), it is preferable that the following formula (A) is satisfied, since a larger amount of the photoalignment component is present on the surface, resulting in excellent liquid crystal alignment ability. When the following formula (A) is satisfied, it is easier to achieve both excellent alignment ability on the positive A layer side and excellent ultraviolet absorption ability with a thinner film. Formula (A): I ＡＵ >1.3 x I ＳＵ (In formula (A), I ＡＵ represents the secondary ion intensity derived from the photoalignment component detected at a position 100 nm from the interface of the alignment layer / ultraviolet absorbing layer on the positive A layer side in the thickness direction toward the alignment layer / ultraviolet absorbing layer. ＳＵ represents the secondary ion intensity derived from the photoalignment component detected at a position 100 nm from the surface of the alignment layer / ultraviolet absorbing layer on the side not in contact with the positive A layer in the thickness direction toward the alignment layer / ultraviolet absorbing layer.

[0223] It is more preferable that the alignment layer / ultraviolet absorbing layer further satisfies the following formula (A-1) when analyzed by time-of-flight secondary ion mass spectrometry (TOF-SIMS): Formula (A-1): I ＡＵ >2.0 x I ＳＵ (In formula (A-1), I ＡＵ , and I ＳＵ has the same definition as in formula (A).

[0224] The presence (localization) of a relatively large amount of the photo-alignment component at the interface on the positive A layer side in the thickness direction of the alignment layer / ultraviolet absorbing layer compared to the surface not in contact with the positive A layer is confirmed as follows. Oblique cutting is performed from the surface of the positive A layer of the optical laminate using a surface / interface cutting tester (SAICAS NN-04 model, manufactured by Daipla Wintes). The cutting conditions are as follows: Cutting blade: made of single crystal diamond Blade width: 1 mm Rake angle of cutting blade: 20° Clearance angle of cutting blade: 10° Horizontal speed of cutting blade: 400 nm / sec Vertical speed of cutting blade: 4 nm / sec Figure 18 is a schematic diagram of the preparation of a sample cut obliquely from the surface of the positive A layer 2 to the surface of the alignment layer / ultraviolet absorbing layer 1 not in contact with the positive A layer (interface with substrate 4) in the optical laminate of the present disclosure. Specifically, the cutting blade is moved from the surface of the optical laminate (surface of the positive A layer 2) in the thickness direction (vertical direction) of the film at the above-mentioned rake angle at a vertical speed of 4 nm / sec to perform cutting 5. Next, when the cutting blade reaches the surface of the alignment layer / ultraviolet absorbing layer 1 that is not in contact with the positive A layer (interface with the substrate 4) (cutting 5), the vertical speed is set to 0 μm / min, and the cutting blade is moved only in a direction parallel to the film surface (horizontal direction) to perform cutting 5 (see FIG. 18 ).

[0225] Next, the oblique cut cross section obtained above is subjected to TOF-SIMS measurement. The TOF-SIMS measurement shows the secondary ion intensity I derived from the alignment component detected at a position 100 nm from the interface on the positive A layer side of the alignment layer / ultraviolet absorbing layer in the thickness direction. ＡＵ and a secondary ion intensity I derived from the alignment component detected at a position 100 nm from the surface of the alignment layer / ultraviolet absorbing layer not in contact with the positive A layer (interface with the substrate) toward the alignment layer / ultraviolet absorbing layer in the thickness direction. ＳＵ In addition, the above I ＡＵ and I ＳＵ The TOF-SIMS measurement conditions for determining the above are as follows: Primary ions: Bi ３ ＋＋Acceleration voltage: 25 kV Primary ion current value: 0.2 pA Measurement area: 300 μm × 300 μm (using a neutralization gun for charge correction) Number of scans: 64 scans The obtained I ＡＵ and I ＳＵ Compared with I ＳＵ <I ＡＵ If the above holds, it can be said that the photo-alignable component is present (localized) in a relatively larger amount at the interface on the positive A layer side compared to the surface not in contact with the positive A layer.

[0226] Furthermore, in the optical laminate of the second present disclosure, the alignment layer / ultraviolet absorbing layer 1 may have a region where the liquid crystalline component contained in the positive A layer has permeated (hereinafter, may be referred to as a "permeation region"). When the permeation region is present, adhesion between the alignment layer / ultraviolet absorbing layer 1 and the positive A layer 2 is likely to be improved. In the optical laminate of the second present disclosure, the alignment layer / ultraviolet absorbing layer 1 may not have a region where the liquid crystalline component contained in the positive A layer has permeated. When the permeation region is not present, the optical laminate of the second present disclosure is likely to have excellent alignment.

[0227] Whether or not there is a region in the alignment layer / ultraviolet absorbing layer 1 where the liquid crystal component contained in the positive A layer has permeated is determined by the method described in the first aspect of the present disclosure.

[0228] The thickness of the permeation region, if present, may be similar to the thickness of the permeation region of the first present disclosure.

[0229] 2. Positive A Layer The positive A layer is a layer that satisfies the relationship Nx>Ny≈Nz. The positive A layer preferably contains a liquid crystalline component as a main component. The positive A layer in the second present disclosure may be the same as the positive A layer described in "2. Positive A Layer" in the first present disclosure.

[0230] The liquid crystal component forming the positive A layer preferably contains a polymerizable liquid crystal compound having a polymerizable functional group in the molecule. The presence of the polymerizable functional group makes it possible to polymerize and fix the liquid crystal compound, thereby providing excellent alignment stability and making it difficult for the retardation to change over time. The polymerizable liquid crystal compound in the second present disclosure may be the same as the polymerizable liquid crystal compound described in "2. Positive A layer" of the first present disclosure.

[0231] The polymerizable liquid crystal composition used in the positive A layer in the second present disclosure may contain a solvent, which may be appropriately selected from conventionally known solvents capable of dissolving or dispersing the components constituting the positive A layer, as in the alignment layer / ultraviolet absorbing layer of the first present disclosure. A solvent that easily dissolves the alignment layer / ultraviolet absorbing layer may be appropriately selected and used to facilitate the formation of the permeation region. On the other hand, a solvent that poorly dissolves the alignment layer / ultraviolet absorbing layer may be appropriately selected and used to make it difficult to form the permeation region. The solids concentration of the polymerizable liquid crystal composition used in the positive A layer is not particularly limited, but may be 1% to 40% by mass, 5% to 30% by mass, or 10% to 25% by mass.

[0232] In the second disclosure, a coating film of the polymerizable liquid crystal composition in which the liquid crystalline component is aligned is irradiated with ultraviolet light to cause a polymerization reaction, polymerizing the polymerizable groups of the polymerizable liquid crystal compound contained in the positive A layer. Because the alignment layer / ultraviolet absorbing layer has the predetermined ultraviolet absorption characteristics, the ultraviolet absorber contained in a large amount in the alignment layer / ultraviolet absorbing layer generates heat when irradiated with ultraviolet light. This can promote the polymerization reaction in the permeation region of the liquid crystalline component of the alignment layer / ultraviolet absorbing layer, if present, resulting in stronger bonding in the permeation region, achieving high adhesion, and also improving wet and heat adhesion.

[0233] 3. Substrate The optical laminate of the present disclosure may include a substrate 4, for example, as shown in Figure 17. The substrate used in the second present disclosure may be the same as the substrate described in "3. Substrate" of the first present disclosure.

[0234] 4. Other Layers The optical laminate of the present disclosure may have other layers as long as the effects of the present disclosure are not impaired. The other layers used in the second present disclosure may be the same as the other layers described in "4. Other Layers" in the first present disclosure.

[0235] 5. Physical Properties of Optical Laminate The optical laminate of the present disclosure includes a positive A layer and an alignment layer / UV absorbing layer directly in contact with the positive A layer, wherein the optical laminate has a transmittance of 1.0% or less at a wavelength of 380 nm and a transmittance of 20.0% or less at a wavelength of 400 nm. The transmittance of the optical laminate at a wavelength of 380 nm may be 0.5% or less, 0.3% or less, or even 0.1% or less, from the viewpoints of blocking blue light and suppressing photodegradation of the positive A layer. Furthermore, the transmittance of the optical laminate at a wavelength of 400 nm may be 10.0% or less, 5.0% or less, or even 3.0% or less, from the viewpoint of further suppressing photodegradation of display elements such as organic light-emitting elements. The transmittance of the optical laminate is determined by measuring the wavelength range of 250 nm to 800 nm at 1 nm intervals using a UV-visible spectrophotometer.

[0236] In the optical laminate of the present disclosure, the in-plane retardation Re of the laminate of the positive A layer and the alignment layer / ultraviolet absorbing layer at a wavelength of 550 nm may be 110 nm or more, and the total thickness of the positive A layer and the alignment layer / ultraviolet absorbing layer may be 1.6 μm or more and 12.0 μm or less. Furthermore, the in-plane retardation Re at a wavelength of 550 nm may be 120 nm or more, and may even be 135 nm or more. The upper limit of the in-plane retardation Re may be 180 nm or less, further may be 160 nm or less, or may even be 150 nm or less. The lower limit of the total thickness of the positive A layer and the alignment layer / ultraviolet absorbing layer is preferably 2.5 μm or more, more preferably 3.5 μm or more. Furthermore, the upper limit of the total thickness of the positive A layer and the alignment layer / ultraviolet absorbing layer is preferably 10.0 μm or less, more preferably 8.0 μm or less, and further preferably 7.0 μm or less from the viewpoint of thinning.

[0237] The optical laminate of the second present disclosure satisfies the following condition (1) in terms of having excellent heat and humidity adhesion. Condition (1): The change in in-plane retardation ΔRe at a wavelength of 550 nm before and after a heat and humidity resistance test (temperature 60°C, relative humidity 95%, 500 hours) of a laminate of a positive A layer and an alignment layer / ultraviolet absorbing layer directly in contact with the positive A layer is 3.0 nm or less. The change in in-plane retardation ΔRe before and after the heat and humidity resistance test of condition (1) may be 2.5 nm or less, 2.0 nm or less, 1.5 nm or less, or 1.0 nm or less, with the smaller the better. The change in in-plane retardation ΔRe refers to the absolute value of the difference in in-plane retardation before and after the heat and humidity resistance test.

[0238] In order for the optical laminate of the second present disclosure to satisfy the condition (1), for example, it is possible to suppress bleed-out of the UV absorber contained in a large amount and to control the fluctuation of the liquid crystalline component at the interface between the alignment layer / UV absorbing layer and the positive A layer under a humid and hot environment. Specifically, for example, bleed-out can be suppressed by using a UV-absorbing polymer as a UV absorber in the composition for the alignment layer / UV absorbing layer. Furthermore, the UV-absorbing polymer can be more easily fixed by increasing the thermal crosslinking group content of the UV-absorbing polymer, or the molecular weight of the UV-absorbing polymer can be increased to further suppress bleed-out. Furthermore, in order to improve the protective function of the alignment layer / UV absorbing layer under a humid and hot environment, the degree of curing of the alignment layer / UV absorbing layer can be increased by increasing the thermal crosslinking group content of the photoalignable copolymer and UV absorber used in the alignment layer / UV absorbing layer, or by increasing the amount of crosslinking agent or acid catalyst. Furthermore, the condition (1) can also be similarly controlled to be satisfied by increasing the drying temperature when forming the alignment layer / UV absorbing layer. In addition, by using a liquid crystal compound having a larger number of polymerizable groups as the polymerizable liquid crystal compound for forming the positive A layer, fluctuations in the liquid crystal component can be suppressed and controlled. Fluctuations in the liquid crystal component can also be suppressed and controlled by increasing the amount of photopolymerization initiator in the polymerizable liquid crystal composition for forming the positive A layer, increasing the amount of ultraviolet light irradiation during positive A layer formation, or increasing the reaction rate of the polymerizable group by heating treatment during ultraviolet light irradiation. However, the control method is not limited to these methods.

[0239] The optical laminate of the present disclosure preferably further satisfies the following condition (2): Condition (2): When a laminate of a positive A layer and an alignment layer / ultraviolet absorbing layer directly in contact with the positive A layer is subjected to a moist heat resistance test (temperature 60°C, relative humidity 95%, 500 hours) and then the adhesion between the positive A layer and the alignment layer / ultraviolet absorbing layer is evaluated by the adhesion test described below, the number of cross-cut portions in the grating pattern that do not peel off is 95% or more. (Adhesion Test) In accordance with JIS K5600-5-6:1999, except that the number of cuts in step 7.1.3 was changed from 6 to 11, and the tape peeling in step 7.2.6 was changed so that a new tape was used each time and repeated five times, 11 cuts were made in each direction of the grid pattern, reaching the positive A layer from the alignment layer / ultraviolet absorbing layer side, with a cut interval of 1 mm, to evaluate the adhesion between the positive A layer and the alignment layer / ultraviolet absorbing layer.

[0240] The number of cross-cut portions in the grid pattern that do not peel off after the moist heat resistance test under condition (2) is more preferably 97% or more, and even more preferably 100%. Note that, in the adhesion test according to JIS K5600-5-6:1999, the number of cuts in step 7.1.3 is increased for more detailed evaluation, and the tape peeling in step 7.2.6 is repeated five times using a new tape each time to evaluate higher adhesion.

[0241] The optical laminate of the present disclosure can be thinned by laminating a positive A layer directly on the alignment layer / ultraviolet absorbing layer. The optical laminate of the present disclosure can be suitably used as an optical component with excellent ultraviolet absorbing function for various image display devices that are intended to be thin. The optical laminate including the positive A layer of the present disclosure is preferably used as a circular polarizer in a form in which a λ / 4 retardation plate and a linear polarizer are combined in an organic electroluminescence display device, for example, and is preferred from the viewpoint of being used as an external light antireflection film, and is also suitably used as a part of a polarizer compensation film in a liquid crystal display device.

[0242] II-B. Transfer Laminate The transfer laminate of the present disclosure is a transfer laminate provided for transferring the positive A layer and the alignment layer / UV absorbing layer, the transfer laminate comprising a support that releasably supports the positive A layer and the alignment layer / UV absorbing layer on the alignment layer / UV absorbing layer side of the optical laminate of the present disclosure. The transfer laminate in the second present disclosure may be the same as the transfer laminate described in "IB. Transfer Laminate" of the first present disclosure, except that the optical laminate of the second present disclosure is used instead of the optical laminate of the first present disclosure.

[0243] The layer structure of the transfer laminate will be described with reference to the drawings. Figure 19 shows one embodiment of the transfer laminate of the present disclosure. One embodiment of the transfer laminate 15 illustrated in Figure 19 comprises a support 11, an alignment layer / ultraviolet absorbing layer 1 that is in direct contact with the support, and a positive A layer 2 that is in direct contact with the alignment layer / ultraviolet absorbing layer 1. In the transfer laminate illustrated in Figure 19, the peel strength between the support 11 and the alignment layer / ultraviolet absorbing layer 1 is smaller than the peel strength between the alignment layer / ultraviolet absorbing layer 1 and the positive A layer 2. This is an example of a transfer laminate that can be peeled at the interface between the support 11 and the alignment layer / ultraviolet absorbing layer 1, and the alignment layer / ultraviolet absorbing layer 1 and the positive A layer 2 can be transferred.

[0244] II-C. Polarizing Plate The present disclosure provides a polarizing plate comprising the optical laminate of the present disclosure and a polarizer. The polarizing plate of the present disclosure may be a polarizing plate comprising a polarizer and the optical laminate of the present disclosure as a transparent protective plate located on at least one side of the polarizer. The polarizing plate of this embodiment will be described with reference to the drawings. FIG. 20 is a schematic cross-sectional view showing one embodiment of a polarizing plate. FIG. 21 is a schematic cross-sectional view showing another embodiment of a polarizing plate.

[0245] The polarizing plate 30 in Figures 20 and 21 has a polarizer 20 and a transparent protective plate (21) located on one side of the polarizer, and the transparent protective plate (21) in Figures 20 and 21 is the optical laminate 10 of the present disclosure. In Figure 20, the optical laminate 10 of the present disclosure that is the transparent protective plate (21) represents an embodiment in which the alignment layer / ultraviolet absorbing layer 1 is located farther from the polarizer 20 than the positive A layer 2. In Figure 21, the optical laminate 10 of the present disclosure that is the transparent protective plate (21) represents an embodiment in which the positive A layer 2 is located farther from the polarizer 20 than the alignment layer / ultraviolet absorbing layer 1. Thus, in the polarizing plate of the present disclosure, the lamination orientation in which the optical laminate of the present disclosure is arranged as a transparent protective plate relative to the polarizer is arbitrary and may be any orientation. In particular, in the case of an embodiment in which the alignment layer / ultraviolet absorbing layer 1 is located farther from the polarizer 20 than the positive A layer 2, as shown in Figure 20, a polarizing plate is used so that the alignment layer / ultraviolet absorbing layer is located on the viewing side, thereby protecting the positive A layer and the like from ultraviolet light from external light with a simple configuration, thereby enhancing the effect of improving the light resistance of the polarizing plate. Note that in the polarizing plate of the present disclosure, the polarizer and the transparent protective plate may be bonded together via an adhesive (an adhesive layer is not shown in Figures 20 and 21). In the polarizing plate of the present disclosure, the polarizer and the transparent protective plate located on at least one side of the polarizer may be adjacent to each other via an adhesive layer or may be in direct contact with each other.

[0246] The polarizing plate in the second present disclosure may be the same as the polarizing plate described in "IC. Polarizing plate" of the first present disclosure, except that the optical laminate of the second present disclosure is used instead of the optical laminate of the first present disclosure.

[0247] II-D. Display Panel The display panel of the present disclosure comprises the optical laminate of the present disclosure described above on the light-emitting surface side of a display element. The display panel of the second disclosure may be the same as the display panel described in "I-D. Display Panel" of the first disclosure, except that the optical laminate of the second disclosure is used instead of the optical laminate of the first disclosure. The display panel of the second disclosure may or may not have the permeation regions 3 and 3' in Figures 11, 12, 14, and 15 in the description of "I-D. Display Panel" of the first disclosure.

[0248] II-E. Image display device The image display device of the present disclosure is not particularly limited as long as it includes a display panel of the present disclosure. The image display device in the second present disclosure may be the same as the image display device described in "I-E. Image display device" of the first present disclosure, except that a display panel including the optical laminate of the second present disclosure is used instead of the display panel including the optical laminate of the first present disclosure.

[0249] The present disclosure will be described in more detail below with reference to examples and comparative examples. In this disclosure, various parameters are values ​​measured at a temperature of 25°C ± 2°C and a relative humidity of 40% to 65%, unless otherwise specified. Furthermore, before starting each measurement, the target sample is exposed to the above atmosphere for 30 minutes or more before measurement and evaluation.

[0250] Example I Series: First Present Disclosure In this disclosure, the following evaluation items (1) layer thickness, (3) transmittance, (4) secondary ion intensity I ＡＵ , I ＳＵ, (5) surface free energy, (6) composite modulus, (7) in-plane retardation Re, (8) adhesion, and (9) humidity and heat adhesion parameters mean the average value of measured values ​​at 16 points unless otherwise specified. The 16 measurement points are the measurement centers when a margin of 1 cm is drawn from the outer edge of the measurement sample and lines are drawn to divide the area inside the margin into 5 equal parts in the vertical and horizontal directions. When the measurement sample is rectangular, a margin of 1 cm is drawn from the outer edge of the rectangle and the area inside the margin is divided into 5 equal parts in the vertical and horizontal directions. Measurements are performed at 16 points at the intersections of the lines, and the average value is calculated. Note that when the measurement sample is a shape other than a rectangle, such as a circle, ellipse, triangle, or pentagon, a rectangle with the largest area inscribed in the shape is drawn, and 16 measurements are performed on the rectangle using the above method.

[0251] (Production Examples A1 to A21: Production of Photo-Orientable Copolymers A1 to A21) Photo-orientable monomers were prepared according to Table 1, thermally crosslinkable monomers were prepared according to Table 2, and second component monomers were prepared according to Tables 3 and 4. Photo-orientable copolymers were synthesized by combining the photo-orientable monomers, second component monomers, and thermally crosslinkable monomers according to Tables 3 and 4. The second component monomer induces a second structural unit that promotes uneven distribution on the surface.

[0252] A specific example of the synthesis of photo-alignable copolymer A1 will be described. Photo-alignable monomer I-1, second component monomer II-1, and thermally crosslinkable monomer III-1 were combined and mixed in a molar ratio of 35:5:60. 2.5 g of α,α'-azobisisobutyronitrile (AIBN) was added as a polymerization catalyst to 1 mol of the monomer mixture, dissolved in 1.3 L of dioxane, and reacted at 90°C for 6 hours. After the reaction was completed, the mixture was purified by reprecipitation using methanol, yielding photo-alignable copolymer A1 in a 65% yield. The mass-average molecular weight of the resulting photo-alignable copolymer was measured, and structural analysis was performed. The mass average molecular weight measurement was carried out using an HLC-8220GPC manufactured by Tosoh Corporation, with the elution solvent being N-methylpyrrolidone to which 0.01 mol / liter of lithium bromide had been added, and the polystyrene standards for the calibration curve were Mw 377,400, 210,500, 96,000, 50,400, 206,500, 10,850, 5,460, 2,930, 1,300, and 580 (all manufactured by Polymer Laboratories, Inc., Easi PS-2 series) and Mw 1,090,000 (manufactured by Tosoh Corporation), and the measurement column was a TSK-GEL ALPHA-M x 2 (manufactured by Tosoh Corporation). It was also confirmed by Py-GC-MS or MALDI-TOFMS that the sample contained structural units derived from the monomers used.

[0253] (Production Example C1: Production of Comparative Photo-Orientable Copolymer C1) Photo-orientable copolymer C1 was synthesized in the same manner as in Production Example 16 described in paragraph 0190 of Japanese Patent No. 5626493.

[0254] (Production Example C2: Production of Comparative Photo-Orientable Polymer C2) Photo-orientable polymer C2 was synthesized in the same manner as described in paragraphs 0069 to 0072 and 0078 of Japanese Patent No. 5,803,064.

[0255] Photoalignable Monomer I-1: Photoalignable monomer I-1 was synthesized in the same manner as photoalignable monomer 3 in Synthesis Example 3 of Japanese Patent No. 5,626,492. Photoalignable Monomer I-2: In Synthesis Example a of Japanese Patent No. 5,626,492, instead of using 4-vinylbenzoic acid, an equimolar amount of 4-methoxycinnamic acid was used, and instead of using ethylene glycol, an equimolar amount of 4-hydroxyphenyl methacrylate (manufactured by Seiko Chemical Co., Ltd.) was used, and the photoalignable monomer I-2 was synthesized by condensation in the same manner. Photoalignable Monomer I-3: Photoalignable monomer I-3 was synthesized in the same manner as photoalignable monomer II-1 in Synthesis Example II-9 in paragraph 0453 of WO 2022 / 158555. Photoalignable Monomer I-4: Photoalignable monomer I-4 was synthesized in the same manner as compound (1-1) in Example 1 of Japanese Patent No. 5,803,064.

[0256] Thermally crosslinkable monomer III-1: 2-hydroxyethyl methacrylate (manufactured by Kyoeisha Chemical Co., Ltd.) Thermally crosslinkable monomer III-2: 4-hydroxybutyl acrylate (manufactured by Tokyo Chemical Industry Co., Ltd.) Thermally crosslinkable monomer III-3: Thermally crosslinkable monomer III-3 was synthesized in the same manner as in thermally crosslinkable monomer 5 of Synthesis Example e of Japanese Patent No. 5626492.

[0257] Second Component Monomer II-1: KBM-5103 (Shin-Etsu Chemical Co., Ltd.) Second Component Monomer II-2: KBM-1403 (Shin-Etsu Chemical Co., Ltd.) Second Component Monomer II-3: 4-Hydroxybutyl acrylate (Tokyo Chemical Industry Co., Ltd.) (5.0 g, 35 mmmol) and imidazole (3.5 g, 52 mmmol) were dissolved in 21 ml of N,N-dimethylformamide, and triisopropylsilyl chloride (Tokyo Chemical Industry Co., Ltd.) (8.0 g, 42 mmmol) dissolved in 5.3 ml of N,N-dimethylformamide was added dropwise, and the mixture was stirred for 24 hours. After completion of the reaction, toluene and an aqueous ammonium chloride solution were added to extract the reaction product, and the solvent was distilled off. The residue was purified by silica gel chromatography, and the solvent was distilled off to synthesize Second Component Monomer II-3. Second Component Monomer II-4: 3-[tris(trimethylsiloxy)silyl]propyl methacrylate (manufactured by Tokyo Chemical Industry Co., Ltd.) Second Component Monomer II-5: Viscoat 13F (manufactured by Osaka Organic Chemical Industry Co., Ltd.) Second Component Monomer II-6: hexyl acrylate (manufactured by Tokyo Chemical Industry Co., Ltd.) Second Component Monomer II-7: octyl acrylate (manufactured by Tokyo Chemical Industry Co., Ltd.) Second Component Monomer II-8: Second Component Monomer II-8 was synthesized in the same manner as in Synthesis Example e of Japanese Patent No. 5626492, except that 1-chlorooctane (manufactured by Tokyo Chemical Industry Co., Ltd.) was used instead of 2-chloroethanol. Second Component Monomer II-9: Second Component Monomer II-9 was synthesized in the same manner as in Synthesis Example e of Japanese Patent No. 5626492, except that 1-bromo-2-(2-methoxyethoxy)ethane (manufactured by Tokyo Chemical Industry Co., Ltd.) was used instead of 2-chloroethanol. Second Component Monomer II-10: tert-butyl acrylate (manufactured by Tokyo Chemical Industry Co., Ltd.) Second Component Monomer II-11: 4-hydroxybutyl acrylate (manufactured by Tokyo Chemical Industry Co., Ltd.) (10 g, 69 mmmol), 1-bromo-3,3-dimethylbutane (manufactured by Tokyo Chemical Industry Co., Ltd.) (15 g, 90 mmmol), and tetrabutylammonium bromide (manufactured by Kanto Chemical Co., Ltd.) (2.2 g, 6.9 mmol) were dissolved in 20 ml of toluene and heated to 50°C. After the predetermined temperature was reached, 17 g of a 25% aqueous sodium hydroxide solution was added dropwise. After the addition was complete, the mixture was heated to 80°C and stirred for 24 hours. After the reaction was complete, toluene and water were added to extract the reaction product, and the solvent was distilled off.The residue was purified by silica gel chromatography and the solvent was distilled off to synthesize second component monomer II-11. Second component monomer II-12: 4-tert-butoxystyrene (manufactured by Tokyo Chemical Industry Co., Ltd.).

[0258] Second Component Monomer II-13: Second Component Monomer II-13 was synthesized in the same manner as in Synthesis Example e of Japanese Patent No. 5626492, except that (3-chloropropyl)tris(trimethylsiloxy)silane (manufactured by Tokyo Chemical Industry Co., Ltd.) was used instead of 2-chloroethanol. Second Component Monomer II-14: 4-Vinylbenzoic acid (manufactured by Tokyo Chemical Industry Co., Ltd.) (5.0 g, 34 mmmol) was dissolved in 50 mL of dimethylformamide, and then 7.0 g of potassium carbonate was added and stirred for 30 minutes. Thereafter, (3-chloropropyl)tris(trimethylsiloxy)silane (manufactured by Tokyo Chemical Industry Co., Ltd.) (15 g, 41 mmmol) was added dropwise. After completion of the dropwise addition, the mixture was heated to 80°C and stirred for 3 hours. After completion of the reaction, water and ethyl acetate were added to extract the reaction product, and the solvent was distilled off. The residue was purified by silica gel chromatography, and the solvent was distilled off to synthesize Second Component Monomer II-14. Second Component Monomer II-15: Acrylic acid (manufactured by Tokyo Chemical Industry Co., Ltd.) (2.6 g, 36 mmmol), 1,1,3,5,5,5-heptamethyl-3-(3-glycidyloxypropyl)trisiloxane (manufactured by Tokyo Chemical Industry Co., Ltd.) (10 g, 30 mmmol), and tetrabutylammonium bromide (manufactured by Kanto Chemical Co., Inc.) (0.3 g, 0.9 mmol) were dissolved in 150 mL of acetonitrile, and the mixture was heated to 80°C and stirred for 7 hours. After completion of the reaction, an aqueous potassium carbonate solution was added, and the unreacted acrylic acid residue was removed into the aqueous phase. Ethyl acetate was then added to extract the reaction product, and the solvent was distilled off. The residue was purified by silica gel chromatography, and the solvent was distilled off, thereby synthesizing Second Component Monomer II-15. Second Component Monomer II-16: 2-Hexyl-1-decanol (manufactured by Tokyo Chemical Industry Co., Ltd.) (7.4 g, 30 mmmol), acryloyl chloride (manufactured by Tokyo Chemical Industry Co., Ltd.) (2.5 g, 27 mmmol), and dimethylaniline (manufactured by Tokyo Chemical Industry Co., Ltd.) (3.3 g, 27 mmmol) were dissolved in 150 mL of tetrahydrofuran, and the mixture was stirred at room temperature for 12 hours. After completion of the reaction, water and ethyl acetate were added to extract the reaction product, and the solvent was distilled off. The residue was purified by silica gel chromatography, and the solvent was distilled off to synthesize Second Component Monomer II-16.

[0259] (Preparation of UV absorbers B1 to B8) The following materials were prepared as UV absorbers. B1: RUVA-93 (Otsuka Chemical Co., Ltd., polymerizable group-containing benzotriazole-based low molecular weight compound) B2: 2-[2-(6-hydroxybenzo[1,3]dioxol-5-yl)-2H-benzotriazol-5-yl]ethyl methacrylate. UV absorber B2 was synthesized in the same manner as UV absorber (B-1) in paragraph 0110 of JP 2021-189224 A. B3: Vanaresin UVA-55MHB (manufactured by Shin-Nakamura Chemical Co., Ltd., benzotriazole-based polymer compound (ultraviolet absorbing polymer)) B4: Vanaresin UVA-5080 (manufactured by Shin-Nakamura Chemical Co., Ltd., benzotriazole-based polymer compound (ultraviolet absorbing polymer)) B5: Ultraviolet absorber B5 (ultraviolet absorbing polymer) was obtained by copolymerizing ultraviolet absorber B2 and 2-hydroxyethyl methacrylate (manufactured by Tokyo Chemical Industry Co., Ltd.) in a molar ratio of 50:50. B6: ULS-935LH (manufactured by Lion Specialty Chemical Co., Ltd., benzophenone-based polymer compound (ultraviolet absorbing polymer)) B7: KEMISORB 111 (manufactured by Chemipro Chemical Co., Ltd., benzophenone-based low molecular weight compound) B8: Tinuvin 460 (manufactured by BAFS, triazine-based low molecular weight compound)

[0260] [Example 1: Production of optical laminate or transfer laminate] (1) Preparation of composition 1 for alignment layer and ultraviolet absorbing layer A composition 1 for alignment layer and ultraviolet absorbing layer having the following composition was prepared: Photoalignable copolymer A1: 15 parts by mass Ultraviolet absorber B3: 70 parts by mass Thermal crosslinker (hexamethoxymethylmelamine, HMM): 15 parts by mass p-toluenesulfonic acid monohydrate (PTSA): 1 part by mass Propylene glycol monomethyl ether (PGME): 260 parts by mass

[0261] (2) Formation of Alignment Layer and Ultraviolet Absorbing Layer Composition 1 for alignment layer and ultraviolet absorbing layer was applied to one surface of a PET substrate (manufactured by Toyobo Co., Ltd., E5100, thickness 38 μm) using a bar coater so that the layer thickness after curing would be 4.3 μm, and the composition was dried and thermally cured by heating in an oven at 90° C. for 1 minute to form a cured film. Thereafter, polarized ultraviolet light containing a 313 nm emission line was irradiated on the surface of this cured film at 100 mJ / cm using an Hg—Xe lamp and a Glan-Taylor prism in a direction perpendicular to the substrate normal.２ By irradiating the cured film, an alignment layer serving as an ultraviolet absorbing layer was formed on the substrate, which further provided the function of an alignment layer.

[0262] (3) Formation of Positive A Layer A polymerizable liquid crystal composition was prepared by adding 5% by mass of a photopolymerization initiator (Omnirad 184, IGM Resins) to a solution prepared by dissolving the following polymerizable liquid crystal compound (product name: LC242, manufactured by BASF) in methyl ethyl ketone to a solid content of 15% by mass. The polymerizable liquid crystal composition was applied to the alignment layer / UV absorbing layer obtained above using a bar coater so that the layer thickness after curing would be 1 μm, and the composition was dried at 85° C. for 120 seconds to form a coating film. This coating film was irradiated with 300 mJ / cm of unpolarized UV light containing a 365 nm emission line using an Hg—Xe lamp in a nitrogen atmosphere. ２ A positive A layer was formed by irradiating the light with light of 1000 W at ...

[0263]

[0264] [Examples 2 to 28: Production of optical laminates or transfer laminates] (1) Preparation of compositions 2 to 28 for alignment layer and ultraviolet absorbing layer Compositions for alignment layer and ultraviolet absorbing layer having the following compositions were prepared: Photoalignable copolymer shown in Table 5: 15 parts by mass Ultraviolet absorber shown in Table 5: 70 parts by mass Thermal crosslinker (hexamethoxymethylmelamine, HMM): 15 parts by mass p-toluenesulfonic acid monohydrate (PTSA): 1 part by mass Propylene glycol monomethyl ether (PGME): 260 parts by mass

[0265] (2) Formation of Alignment Layer and Ultraviolet Absorbing Layer An alignment layer and ultraviolet absorbing layer was formed in the same manner as in Example 1, except that one of compositions 2 to 28 for alignment layer and ultraviolet absorbing layer was used instead of using composition 1 for alignment layer and ultraviolet absorbing layer in Example 1. (3) Formation of Positive A Layer A positive A layer was formed on the alignment layer and ultraviolet absorbing layer obtained above in the same manner as in Example 1, to produce an optical laminate.

[0266] [Examples 29 to 31: Production of optical laminates or transfer laminates] (1) Preparation of compositions 29 to 31 for alignment layer and ultraviolet absorbing layer Compositions for alignment layer and ultraviolet absorbing layer were prepared in the same manner as in Example 1, except that the mass ratio of the photoalignable copolymer and ultraviolet absorber was changed as shown in Table 5.

[0267] (2) Formation of Alignment Layer and Ultraviolet Absorbing Layer An alignment layer and ultraviolet absorbing layer was formed in the same manner as in Example 1, except that one of Compositions 29 to 31 for alignment layer and ultraviolet absorbing layer was used instead of Composition 1 for alignment layer and ultraviolet absorbing layer in Example 1. (3) Formation of Positive A Layer A positive A layer was formed on the alignment layer and ultraviolet absorbing layer obtained above in the same manner as in Example 1, to produce an optical laminate.

[0268] [Comparative Examples 1 to 6] In Comparative Examples 1 to 6, compositions were prepared in the same manner as in Example 1, except that one or more of the type of photo-alignable copolymer, the type of UV absorber, the mass ratio of the photo-alignable copolymer, the mass ratio of the UV absorber, and the mass ratio of the thermal crosslinker were changed as shown in Table 5. Using any one of the compositions of Comparative Examples 1 to 6 shown in Table 5, a UV absorbing layer was formed on a PET substrate in the same manner as the alignment layer / UV absorbing layer of Example 1. A coating film of a polymerizable liquid crystal composition was formed on the obtained UV absorbing layer in the same manner as the positive A layer of Example 1, and a cured film of the polymerizable liquid crystal compound was formed by irradiating it with UV light in the same manner.

[0269] [Evaluation] The following evaluations were performed on the obtained optical laminate. (1) Measurement of Layer Thickness The layer thicknesses of the alignment layer / ultraviolet absorbing layer and the positive A layer were measured by using a scanning transmission electron microscope (STEM) (Hitachi High-Technologies Corporation, S-4800) to photograph the cross sections of the alignment layer / ultraviolet absorbing layer and the positive A layer. The thicknesses of the alignment layer / ultraviolet absorbing layer and the positive A layer were measured at 10 points on the image of the cross section, and the arithmetic mean value of the layer thicknesses at those 10 points was used. The penetration region was observed as a portion where both fragments derived from components contained in the positive A layer and fragment ions derived from components contained in the alignment layer / ultraviolet absorbing layer were detected by TOF-SIMS, and was included in the thickness of the alignment layer / ultraviolet absorbing layer. Cross-sectional photographs of the alignment layer / ultraviolet absorbing layer and the positive A layer were taken as follows. First, a sample cut to 1 mm x 10 mm was embedded in an embedding resin to prepare a block, and uniform slices with a thickness of 70 nm to 100 nm and no holes were cut from this block using a general slice preparation method. An ultramicrotome (EM UC7, manufactured by Leica Microsystems) was used to prepare the sections. These uniform sections without holes or other defects were used as measurement samples. Cross-sectional photographs of the measurement samples were then taken using a scanning transmission electron microscope (STEM). When taking these cross-sectional photographs, STEM observations were performed with the detector set to "TE," the acceleration voltage set to "30 kV," and the emission current set to "10 μA." The magnification was adjusted appropriately from 5,000x to 200,000x while adjusting the focus and observing whether the contrast and brightness of each layer could be distinguished.

[0270] (2) Presence or absence of permeated region Whether or not there is a region in the alignment layer / ultraviolet absorbing layer into which the liquid crystalline component contained in the positive A layer has permeated was determined by etching from the surface of the positive A layer in the thickness direction of the layer with an argon gas cluster ion beam (Ar-GCIB) gun (15 kV, 2.5 nA, 500 × 500 μm) while determining the layer thickness direction distribution of fragment ions derived from the liquid crystalline component derived from the positive A layer and fragment ions derived from the alignment component contained in the alignment layer / ultraviolet absorbing layer with a time-of-flight secondary ion mass spectrometry (TOF-SIMS) device (UIvac-PHI, TRIFT V Nano TOF). The analysis of the layer thickness direction distribution was carried out by repeating a series of operations, such as performing a component analysis of a surface depth region of 1 nm to 2 nm, then digging 10 nm in the layer thickness direction with a gas cluster ion beam, performing a component analysis of the next surface depth region of 1 nm to 2 nm, and further digging 10 nm in the layer thickness direction with a gas cluster ion beam, and performing a component analysis of the next surface depth region of 1 nm to 2 nm. Based on the results of the layer thickness measurement, the above-mentioned repeated operation was started after digging from the surface of the positive A layer in the depth direction to 80% of the layer thickness, and in the layer thickness direction distribution, when there is a part where both fragment ions derived from the liquid crystal component derived from the positive A layer and fragment ions derived from the alignment component contained in the alignment layer / ultraviolet absorbing layer are detected, it was determined that there is a region where the liquid crystal component has penetrated (there is a penetration region), and when there is no part where both are detected, it was determined that there is no penetration region. In the TOF-SIMS measurement, double-charged ions of bismuth clusters (Bi ３ ＋＋ The ion beam was irradiated at a central area of ​​100 μm×100 μm in the etching ion beam irradiation area, and a neutralization gun was used to correct the charging of the sample during analysis.

[0271] (3) Transmittance Using an ultraviolet-visible spectrophotometer (UV-2700, manufactured by Shimadzu Corporation), the transmittance of the optical laminate was measured at 1 nm intervals in the range of 250 nm to 800 nm, and the transmittance at wavelengths of 380 nm and 400 nm was determined.

[0272] (4) Confirmation of Maldistribution Oblique cutting was performed from the surface of the positive A layer of the optical laminate using a surface / interface cutting tester (SAICAS NN-04 model, manufactured by Daipla Wintes). The cutting conditions were as follows: Cutting blade: made of single crystal diamond Blade width: 1 mm Rake angle of cutting blade: 20° Clearance angle of cutting blade: 10° Horizontal speed of cutting blade: 400 nm / sec Vertical speed of cutting blade: 4 nm / sec FIG. 3 is a schematic diagram of the preparation of a sample of the optical laminate of the present disclosure, cut in an oblique direction from the surface of the positive A layer 2 to the surface of the alignment layer / ultraviolet absorbing layer 1 that does not contact the positive A layer (interface with the substrate 4). Specifically, the cutting blade was moved from the surface of the optical laminate (surface of the positive A layer 2) in the thickness direction of the film (vertical direction) at the rake angle at a vertical speed of 4 nm / sec to perform cutting 5. Next, when the cutting blade reached the surface of the alignment layer / ultraviolet absorbing layer 1 that was not in contact with the positive A layer (the interface with the substrate 4) (cut 5), the vertical speed was set to 0 μm / min, and the cutting blade was moved only in the direction parallel to the film surface (horizontal direction) to perform cut 5 (see Figure 3).

[0273] Next, the secondary ion intensity I derived from the alignment component detected by TOF-SIMS at a position 100 nm from the interface on the positive A layer side of the alignment layer / ultraviolet absorbing layer in the thickness direction was measured. ＡＵ and a secondary ion intensity I derived from the alignment component detected at a position 100 nm from the surface of the alignment layer / ultraviolet absorbing layer not in contact with the positive A layer (interface with the substrate) toward the alignment layer / ultraviolet absorbing layer in the thickness direction. ＳＵ The measurement conditions for TOF-SIMS were as follows: Primary ions: Bi ３ ＋＋ Acceleration voltage: 25 kV Primary ion current value: 0.2 pA Measurement area: 300 μm × 300 μm (using a neutralization gun for charge correction) Number of scans: 64 scans

[0274] Obtained I ＡＵ and I ＳＵ The results were compared and evaluated as follows: A: I ＡＵ >1.3 x I ＳＵ B:I ＳＵ <I ＡＵ ≦1.3×IＳＵ C:I ＡＵ ≦I ＳＵ In the cases of A and B, it is determined that, in the thickness direction of the alignment layer / ultraviolet absorbing layer, the photoalignment component is present in relatively greater amounts at the interface on the positive A layer side compared to the surface not in contact with the positive A layer.

[0275] (5) Surface Free Energy (5-1) Surface Free Energy of the Positive A Layer Side Surface (Positive A Layer Side Interface) of the Alignment Layer / UV Absorption Layer The surface free energy of the alignment layer / UV absorption layer prepared in the examples was measured and used as the surface free energy of the positive A layer side interface of the alignment layer / UV absorption layer. The surface free energy was measured using a double titration contact angle / surface free energy analyzer (Kruss, MSA) to measure the contact angles of water and diiodomethane on the surface of the alignment layer / UV absorption layer, and the contact angle was calculated using the ellipse fitting method. The measurement conditions were as follows: First, a measurement sample was attached to a smooth glass plate using double-sided tape (Teraoka, product number: 7570), and water and diiodomethane were dropped onto the fixed sample using a double titration contact angle / surface free energy analyzer (Kruss, MSA). The drop volume was 1 μL each, and the contact angle was set to be measured 2 seconds after the drop. Using the calculated contact angle, the surface free energy was calculated by the OWRK (Owens-Wendt-Rable-Kaelble) method. The contact angle by the ellipse fitting method and the surface free energy by the OWRK (Owens-Wendt-Rable-Kaelble) method were calculated using the analytical method of the double titration contact angle / surface free energy analyzer (MSA, manufactured by KRUSS) set as described above. The following values ​​were used for the surface tension, dispersion component, and polar component of water and diiodomethane. Water: Surface tension 72.8 mN / m (dispersion component 21.8 mN / m + polar component 51.0 mN / m) Diiodomethane: Surface tension 50.8 mN / m (dispersion component 50.8 mN / m + polar component 0 mN / m) (5-2) Surface free energy of the side of the alignment layer / ultraviolet absorbing layer not in contact with the positive A layer (substrate side interface) The alignment layer / ultraviolet absorbing layer and the positive A layer were transferred to adhesive glass, and the PET substrate was peeled off to prepare a measurement sample in the following order: alignment layer / ultraviolet absorbing layer / positive A layer / adhesive glass. An optical adhesive (Panaclean PD-S1, 25 μm, acrylic adhesive, manufactured by Panac Corporation) was used as the adhesive. The surface free energy of the measurement sample surface was measured in the same manner as in (5-1).

[0276] (6) Composite Elastic Modulus The composite elastic modulus of the alignment layer / UV absorbing layer was determined as follows. First, the positive A layer side of the retarder was attached to glass coated with a cyanoacrylate instant adhesive (Aron Alpha (registered trademark) EXTRA Quick-Acting Multipurpose, manufactured by Toagosei Co., Ltd.), and the glass was placed on the PET substrate side. The adhesive surface was pressed for 1 minute so that the thickness of the adhesive layer from both glass surfaces was 45 μm. The sample was then left to stand for 10 minutes, after which the PET substrate was peeled off to transfer the alignment layer / UV absorbing layer and the positive A layer. A measurement sample was then prepared in the following order: alignment layer / UV absorbing layer / positive A layer / adhesive-attached glass. Using the measurement sample, the indentation hardness of the surface of the alignment layer / UV absorbing layer exposed by peeling off the PET substrate was measured. The indentation hardness (HIT) of the measurement sample was measured using a nanoindenter (TI950 TriboIndenter, manufactured by BRUKER). Under the following measurement conditions, a Berkovich indenter (triangular pyramid, TI-0039 manufactured by BRUKER) was pressed vertically into the surface of the alignment layer / ultraviolet absorbing layer for 10 seconds until the maximum indentation load reached 3 μN. After that, the indenter was held for a certain time to relax the residual stress, and then the load was released for 10 seconds to measure the maximum load after relaxation. The maximum load Pmax (μN) and the contact projected area Ap (nm ２ ) and the indentation hardness (HIT) was calculated by Pmax / Ap. The contact projected area was determined by correcting the indenter tip curvature using the Oliver-Pharr method using a standard sample of fused quartz (5-0098 manufactured by BRUKER). If any of the measured values ​​deviated from the arithmetic mean value by ±20% or more, that measured value was excluded and remeasured. (Measurement conditions) Loading rate: 0.3 μN / sec Holding time: 5 seconds Loading / unloading rate: 0.3 μN / sec Measurement temperature: 25°C Next, the composite elastic modulus Er was calculated from the above formula (1) using the contact projected area Ap obtained when measuring the indentation hardness (HIT) of the resulting alignment layer / ultraviolet absorbing layer.

[0277] (7) Orientation An alignment layer / ultraviolet absorbing layer and a positive A layer were transferred to adhesive glass, and the PET substrate was peeled off to prepare a measurement sample in the following order: alignment layer / ultraviolet absorbing layer / positive A layer / adhesive glass. An optical adhesive (Panaclean PD-S1, 25 μm, acrylic adhesive, manufactured by Panac Corporation) was used as the adhesive. The alignment state of the positive A layer (cured film of a polymerizable liquid crystal compound) of the measurement sample was observed at a magnification of 200x using a polarizing microscope (BX-51, manufactured by Olympus Corporation). Furthermore, the in-plane retardation Re at a wavelength of 550 nm was measured for the positive A layer of the measurement sample using a retardation measurement device (KOBRA-WR, manufactured by Oji Scientific Instruments Co., Ltd.), and the alignment (alignment ability) of the liquid crystal compound due to the alignment layer / ultraviolet absorbing layer was evaluated. The measurement conditions for retardation measurement were as follows: (A1) First, to stabilize the KOBRA-WR light source, turn on the light source and leave it for at least 60 minutes. Then, select waveplate measurement and obtain data for the reference analyzer. (A2) Measured using incident angle dependence (single N calculation) under the following measurement conditions. (Measurement conditions) - Measurement mode: Standard - Tilt central angle: Fast axis - Incident angle: 0° - Number of average measurements: 3 - Average refractive index of the layer to be measured: The sample for orientation measurement was measured using an Abbe refractometer (manufactured by Atago Co., Ltd.) using the sodium D line (589 nm) as the light source in accordance with JIS K7142. The measured value (average refractive index) was entered. - Thickness: The total thickness of the alignment layer / UV absorbing layer and the positive A layer measured in Evaluation (1) was entered. (Evaluation criteria for orientation) A: Uniform orientation was observed with the naked eye, and 90% or more was oriented under polarizing microscope observation, and Re≧135 nm B: Uniform orientation was observed with the naked eye, and 90% or more was oriented under polarizing microscope observation, and 110 nm≦Re<135 nm C: Orientation was not as good as that of A and B observed with the naked eye, and the oriented area under polarizing microscope observation was 50% or more but less than 90%, or uniform orientation was observed with the naked eye, and Re<110 nm D: No orientation was observed with the naked eye, and the oriented area under polarizing microscope observation was 50% or less (the relationship Nx>Ny≒Nz of the positive A layer was not satisfied)

[0278] (8) Adhesion The PET substrate of the optical laminate was peeled off, and the alignment layer / ultraviolet absorbing layer and the positive A layer were transferred to adhesive glass in the following order: alignment layer / ultraviolet absorbing layer / positive A layer / adhesive glass to prepare a measurement sample. An acrylic adhesive (manufactured by Soken Chemical & Engineering Co., Ltd., product name: SK Dyne 1838) was used for adhesion. The adhesion of the measurement sample was evaluated by the cross-cut method in accordance with JIS K5600-5-6:1999, except that the number of cuts in step 7.1.3 in JIS K5600-5-6:1999 was changed from 6 to 11, and the tape peeling in step 7.2.6 was repeated five times using new tape each time. Using a cutter knife, 11 cuts were made from the alignment layer / ultraviolet absorbing layer side to the positive A layer, and then 11 cuts were made by rotating it 90°. According to procedure 7.2.6 of JIS K5600-5-6:1999, Cellotape (registered trademark) (24mm x 35m CT405AP-24, manufactured by Nichiban) was applied to the cut coating surface, and the tape was rubbed with an eraser to adhere to the coating. After one minute, the edge of the tape was held perpendicular to the coating surface and instantly peeled off. The tape application and peeling process in procedure 7.2.6 was repeated five times in total, using new tape each time. After peeling, the ratio of the number of cut portions of the remaining alignment layer / ultraviolet absorbing layer was determined and evaluated according to the following criteria. (Evaluation criteria) AA: 100 / 100 A: 90 / 100 to 99 / 100 B: 50 / 100 to 89 / 100 C: 0 / 100 to 49 / 100

[0279] (9) Humidity and Heat Adhesion A measurement sample prepared in the same manner as in Evaluation (8) was subjected to a humidity and heat resistance test in which it was left standing for 500 hours in an environment of 60 °C and 95% RH. For the measurement sample after the humidity and heat resistance test, adhesion was evaluated by the cross-cut method in accordance with JIS K5600-5-6:1999, except that the number of cuts in step 7.1.3 was changed from 6 to 11. Using a utility knife, 11 cuts were made from the alignment layer / ultraviolet absorbing layer side to the positive A layer, and then 11 more cuts were made by turning 90°. Cellotape (registered trademark) (24 mm x 35 m CT405AP-24, manufactured by Nichiban) was attached to the cut coating surface, and the tape was rubbed with an eraser to adhere to the coating. After 1 minute, the edge of the tape was held perpendicular to the coating surface and instantly peeled off. The ratio of the number of cut portions of the alignment layer / ultraviolet absorbing layer remaining after peeling was determined and evaluated according to the following criteria: (Evaluation criteria) AA: 100 / 100 A: 90 / 100 to 99 / 100 B: 50 / 100 to 89 / 100 C: 0 / 100 to 49 / 100

[0280] (10) Bending Resistance A mandrel test was performed on the optical laminate in accordance with JIS K5600-5-1:1999 to evaluate its bending resistance. Specifically, the optical laminate cut into a size of 100 mm x 25 mm was wrapped around a 2 mm diameter stainless steel rod with the positive A layer facing inward and both ends of the optical laminate facing each other in the long side direction. After holding this state for 5 seconds, the optical laminate was released and checked for cracks or bending marks in the short side direction of the retardation plate that had been in contact with the stainless steel rod. The winding was performed a maximum of 20 times. The evaluation results were as follows: A: No cracks or bending marks were observed in the retardation plate even after the 20th mandrel test. B: No cracks or bending marks were observed in the retardation plate after the first mandrel test, but cracks or bending marks were observed in the retardation plate after the first 20th mandrel test. C: In the first mandrel test, cracks or bend marks were found on the retardation plate.

[0281]

[0282]

[0283] [Summary of Results] The optical laminates of Examples 1 to 31 had an alignment layer / UV absorbing layer directly in contact with the positive A layer, and the optical laminates had a transmittance of 1.0% or less at a wavelength of 380 nm and a transmittance of 20.0% or less at a wavelength of 400 nm. The alignment layer / UV absorbing layer contained a region at the interface on the positive A layer side where the liquid crystalline component contained in the positive A layer had penetrated. This resulted in optical laminates with excellent UV absorption ability and improved adhesion and humidity / heat adhesion. The optical laminates of Examples 1 to 31 were also shown to be capable of achieving excellent UV absorption ability without providing a separate UV absorbing layer, improving production efficiency and contributing to thinner films. The optical laminates of Examples 1 to 31 had a composite elastic modulus of 3.0 GPa or more and 6.5 GPa or less on the surface of the alignment layer / UV absorbing layer not in contact with the positive A layer, and also had good flexural resistance. In contrast, in Comparative Examples 1 and 2, in which a conventional photoalignment copolymer and UV absorber were used in the same blend ratio (photoalignment copolymer:UV absorber = 15:70 (mass ratio)) as in Example 1 instead of the alignment layer / UV absorbing layer of the Examples, the photoalignment function of the photoalignment copolymer was not fully exhibited, and a positive A layer was not obtained, although the alignment layer / UV absorbing layer of the Examples had excellent UV absorption ability. In Comparative Example 3, in which a conventional photoalignment copolymer and UV absorber were used in place of the alignment layer / UV absorbing layer of the Examples, a high content of photoalignment copolymer (photoalignment copolymer:UV absorber = 72:13 (mass ratio)) was used, and no thermal crosslinker was used, the UV absorption function was insufficient, the alignment of the positive A layer was poor, and the adhesion and wet heat adhesion were also poor. In Comparative Example 4, in which a conventional photo-orienting copolymer and ultraviolet absorber were used instead of the alignment layer / ultraviolet absorption layer of the example, a high content of photo-orienting copolymer (photo-orienting copolymer:ultraviolet absorber = 72:13 (mass ratio)) was used, and a thermal crosslinking agent was also used, the ultraviolet absorption function was insufficient and the adhesion and wet heat adhesion were also poor.In the alignment layer / ultraviolet absorbing layer, the same photo-alignable copolymer and ultraviolet absorber as in Example 1 were used in the same blending ratio as in Example 1, but in Comparative Example 5, which did not include a region where the liquid crystalline component contained in the positive A layer had penetrated at the interface on the positive A layer side, the ultraviolet absorption ability and alignment ability were excellent, but the adhesion and moist heat adhesion were poor. In Comparative Example 6, the same photo-alignable copolymer and ultraviolet absorber as in Example 1 were used in the alignment layer / ultraviolet absorbing layer in the same blending ratio as in Example 1, but no thermal crosslinking agent was used, the photo-alignment function of the photo-alignable copolymer could not be fully exhibited, and a positive A layer could not be obtained. The optical laminates of Comparative Examples 3 to 6 also had inferior flex resistance compared to the Examples.

[0284] Example II Series: Second Present Disclosure In this disclosure, the following evaluation items (1) layer thickness, (2) transmittance, (3) secondary ion intensity I ＡＵ , I ＳＵ The parameters of (4) in-plane retardation Re, (5) in-plane retardation Re after the wet heat test, and (6) wet heat adhesion are the average values ​​of the measurements taken at 16 points unless otherwise specified. The measurements at 16 points were carried out as described in the first Example I series of the present disclosure.

[0285] (Production Examples A1 to A21: Production of Photo-Orientable Copolymers A1 to A21) Photo-orientable copolymers A1 to A21 were produced in the same manner as Production Examples A1 to A21 described in the Example I series of the first present disclosure.

[0286] Comparative photo-alignable copolymer C1 and comparative photo-alignable polymer C2 were prepared in the same manner as comparative photo-alignable copolymer C1 and comparative photo-alignable polymer C2 described in the first Example I series of this disclosure, respectively.

[0287] (Preparation of UV absorbers B2 to B6) The following materials were prepared as UV absorbers. B2: 2-[2-(6-hydroxybenzo[1,3]dioxol-5-yl)-2H-benzotriazol-5-yl]ethyl methacrylate, synthesized in the same manner as UV absorber (B-1) in paragraph 0110 of JP 2021-189224. B3: Vanalesin UVA-55MHB (manufactured by Shin-Nakamura Chemical Co., Ltd., benzotriazole-based polymer compound (ultraviolet absorbing polymer)) B4: Vanalesin UVA-5080 (manufactured by Shin-Nakamura Chemical Co., Ltd., benzotriazole-based polymer compound (ultraviolet absorbing polymer)) B5: UV absorber B2 and 2-hydroxyethyl methacrylate (manufactured by Tokyo Chemical Industry Co., Ltd.) were copolymerized in a molar ratio of 50:50 to obtain UV absorber B5 (ultraviolet absorbing polymer). B6: ULS-935LH (manufactured by Lion Specialty Chemical Co., Ltd., benzophenone-based polymer compound (ultraviolet absorbing polymer))

[0288] [Example II-1: Production of optical laminate or transfer laminate] (1) Preparation of composition II-1 for alignment layer and ultraviolet absorbing layer A composition II-1 for alignment layer and ultraviolet absorbing layer having the following composition was prepared: Photoalignable copolymer A1: 15 parts by mass Ultraviolet absorber B3: 70 parts by mass Thermal crosslinker (hexamethoxymethylmelamine, HMM): 15 parts by mass p-toluenesulfonic acid monohydrate (PTSA): 1 part by mass Propylene glycol monomethyl ether (PGME): 260 parts by mass

[0289] (2) Formation of Alignment Layer and Ultraviolet Absorbing Layer Composition II-1 for alignment layer and ultraviolet absorbing layer was applied to one surface of a PET substrate (manufactured by Toyobo Co., Ltd., E5100, thickness 38 μm) using a bar coater so that the layer thickness after curing would be 4.3 μm, and the composition was dried and thermally cured by heating in an oven at 90° C. for 1 minute to form a cured film. Thereafter, polarized ultraviolet light containing a 313 nm emission line was applied to the surface of this cured film at 100 mJ / cm using an Hg—Xe lamp and a Glan-Taylor prism in a direction perpendicular to the substrate normal. ２By irradiating the cured film with 100 parts by mass of a polymerizable liquid crystal compound of the following chemical formula (LC-1), which was prepared in the same manner as Compound 1 represented by formula (1-1) in Japanese Patent No. 6,473,537, and 4 parts by mass of a photopolymerization initiator (2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one: Irgacure 907, manufactured by BASF), were dissolved in 900 parts by mass of cyclopentanone to prepare a composition for a positive A layer.

[0290]

[0291] (4) Formation of Positive A Layer The composition for the positive A layer was applied onto the alignment layer and ultraviolet absorbing layer obtained above by bar coating so that the layer thickness after curing would be 1 μm, and after drying at 140° C. for 120 seconds, ultraviolet (UV) was irradiated at a dose of 400 mJ / cm using an H bulb manufactured by Fusion. ２ A positive A layer was formed by irradiating the light with a UV-ray source.

[0292] [Examples II-2 to II-24: Production of optical laminates and transfer laminates] (1) Preparation of compositions II-2 to II-24 for alignment layer and ultraviolet absorbing layer Compositions for alignment layer and ultraviolet absorbing layer having the following compositions were prepared: Photoalignable copolymer shown in Table 7: 15 parts by mass Ultraviolet absorber shown in Table 7: 70 parts by mass Thermal crosslinker (hexamethoxymethylmelamine, HMM): 15 parts by mass p-toluenesulfonic acid monohydrate (PTSA): 1 part by mass Propylene glycol monomethyl ether (PGME): 260 parts by mass

[0293] (2) Formation of Alignment Layer and Ultraviolet Absorbing Layer An alignment layer and ultraviolet absorbing layer was formed in the same manner as in Example 1, except that one of the alignment layer and ultraviolet absorbing layer compositions II-2 to II-24 was used instead of the alignment layer and ultraviolet absorbing layer composition II-1 in Example II-1. (3) Formation of Positive A Layer A positive A layer was formed on the alignment layer and ultraviolet absorbing layer obtained above in the same manner as in Example II-1, to produce an optical laminate.

[0294] [Comparative Examples II-1 to II-6] Compositions were prepared in the same manner as in Example II-1, except that one or more of the type of photo-alignable copolymer, the type of UV absorber, the mass ratio of the photo-alignable copolymer, the mass ratio of the UV absorber, and the mass ratio of the thermal crosslinker were changed as shown in Table 7. Using any one of the compositions of Comparative Examples II-1 to II-6 shown in Table 7, a UV absorbing layer was formed on a PET substrate in the same manner as the alignment layer / UV absorbing layer of Example II-1. A coating film of a polymerizable liquid crystal composition was formed on the obtained UV absorbing layer in the same manner as the positive A layer of Example II-1, and a cured film of the polymerizable liquid crystal compound was formed by irradiating with UV light in the same manner.

[0295] [Evaluation] The following evaluations were carried out on the obtained optical laminate. (1) Measurement of Layer Thickness The layer thickness was measured in the same manner as in "(1) Measurement of Layer Thickness" described in Example I series of the first present disclosure.

[0296] (2) Transmittance The transmittance was measured in the same manner as in "(3) Transmittance" described in Example I series of the first present disclosure.

[0297] (3) Checking for uneven distribution Checking for uneven distribution was evaluated in the same manner as in "(4) Checking for uneven distribution" described in Example I series of the first present disclosure. However, the optical laminate of the second present disclosure does not need to have a permeation region as shown in FIG.

[0298] (4) Orientation The orientation was evaluated in the same manner as in "(7) Orientation" described in the Example I series of the first present disclosure.

[0299] (5) Retardation Variation Before and After Humid Heat Test The measurement sample prepared in "(4) Orientation" was subjected to a 500-hour humid heat test in which it was left standing in an environment of 60°C and 95% RH. The in-plane retardation Re at a wavelength of 550 nm after the humid heat test was measured in the same manner as in "(4) Orientation." The absolute value of the difference between the in-plane retardation Re at a wavelength of 550 nm before the humid heat test and the in-plane retardation Re at a wavelength of 550 nm after the humid heat test was calculated, and this was taken as the change in in-plane retardation ΔRe.

[0300] (6) Humidity and Heat Adhesion The PET substrate of the optical laminate was peeled off, and the alignment layer / UV absorbing layer and the positive A layer were transferred to adhesive glass in the following order: alignment layer / UV absorbing layer / positive A layer / adhesive glass to prepare a measurement sample. An acrylic adhesive (manufactured by Soken Chemical & Engineering Co., Ltd., product name: SK Dyne 1838) was used as the adhesive. A humidity and heat resistance test was performed in which the measurement sample was left standing in an environment of 60°C and 95% RH for 500 hours. After the humidity and heat resistance test, the measurement sample was evaluated for adhesion using the cross-cut method according to JIS K5600-5-6:1999, except that the number of cuts in step 7.1.3 was changed from 6 to 11, and the tape peeling in step 7.2.6 was repeated five times using a new tape each time. Using a utility knife, 11 cuts were made from the alignment layer / ultraviolet absorbing layer side to the positive A layer, and then the knife was turned 90° to make 11 more cuts. According to procedure 7.2.6 of JIS K5600-5-6:1999, Cellotape (registered trademark) (24 mm x 35 m CT405AP-24, manufactured by Nichiban) was applied to the cut coating surface, and the tape was rubbed with an eraser to adhere to the coating. After 1 minute, the edge of the tape was held perpendicular to the coating surface and instantly peeled off. The tape application and peeling process in procedure 7.2.6 was repeated five times, using new tape each time. The ratio of the number of cut portions of the alignment layer / ultraviolet absorbing layer remaining after peeling was determined and evaluated according to the following criteria. (Evaluation criteria) AA: 100 / 100 A: 95 / 100 to 99 / 100 B: 50 / 100 to 94 / 100 C: 0 / 100 to 49 / 100

[0301]

[0302] [Summary of Results] The optical laminates of Examples II-1 to II-24 have an alignment layer / UV absorbing layer in direct contact with the positive A layer, and the transmittance at a wavelength of 380 nm of the optical laminate is 1.0% or less, and the transmittance at a wavelength of 400 nm is 20.0% or less. The change in in-plane retardation ΔRe at a wavelength of 550 nm before and after a specific moist heat resistance test is 3.0 nm or less. Therefore, optical laminates having excellent UV absorption ability and excellent moist heat adhesion were obtained. The optical laminates of Examples II-1 to II-24 were also shown to be optical laminates that can achieve excellent UV absorption ability without providing a separate UV absorbing layer, improve production efficiency, and contribute to thinning. In contrast, in Comparative Examples II-1 and II-2, in which the alignment layer / UV absorbing layer of the Examples was replaced with a conventional photoalignment copolymer and the same UV absorber as in Example II-1, but in the same blending ratio (photoalignment copolymer:UV absorber = 15:70 (mass ratio)), the photoalignment function of the photoalignment copolymer was not fully exhibited, and a positive A layer was not obtained. In Comparative Example II-3, in which the alignment layer / UV absorbing layer of the Examples was replaced with a conventional photoalignment copolymer and UV absorber, with a photoalignment copolymer:UV absorber = 72:13 (mass ratio), a high content of the photoalignment copolymer, and no thermal crosslinker was used, the UV absorption function was insufficient, the alignment was poor, and the change in in-plane retardation ΔRe at a wavelength of 550 nm before and after a specific moist heat resistance test exceeded 3.0 nm, and the moist heat adhesion was also poor. In Comparative Example II-4, in which a conventional photo-orientation copolymer and UV absorber were used instead of the alignment layer / UV absorbing layer of the example, a high content of photo-orientation copolymer (photo-orientation copolymer:UV absorber = 72:13 (mass ratio)) was used, and a thermal crosslinking agent was also used, the UV absorption function was insufficient, the change in in-plane retardation ΔRe at a wavelength of 550 nm before and after a specific moist heat resistance test exceeded 3.0 nm, and the moist heat adhesion was also poor.In Comparative Example II-5, a conventional photo-alignment copolymer and the same UV absorber as in Example II-1 were used instead of the alignment layer / UV absorbing layer of the examples, but a photo-alignment copolymer:UV absorber = 72:13 (mass ratio) was used, with a high content of the photo-alignment copolymer, and a thermal crosslinker was also used. The UV absorption function was insufficient, and the change in in-plane retardation ΔRe at a wavelength of 550 nm before and after a specific moist heat resistance test exceeded 3.0 nm, and the moist heat adhesion was also poor. In Comparative Example II-6, the same photo-alignment copolymer and UV absorber as in Example II-1 were used in the alignment layer / UV absorbing layer at the same blending ratio as in Example II-1, but no thermal crosslinker was used. The photo-alignment function of the photo-alignment copolymer could not be fully demonstrated, and a positive A layer was not obtained.

[0303] REFERENCE SIGNS LIST 1, 1' Alignment layer / ultraviolet absorbing layer 2, 2' Positive A layer 3, 3' Permeation region 4 Substrate 5 Cutting 10, 10' Optical laminate 11 Support 15 Transfer laminate 20 Polarizer 21 Transparent protective plate 22 Transparent protective plate 24 Positive A layer 30 Polarizing plate 40 Display element 50 Display panel

Claims

1. An optical laminate including a positive A layer and an alignment layer / ultraviolet absorber layer directly contacting the positive A layer, wherein the transmittance of the optical laminate at a wavelength of 380 nm is 1.0% or less and the transmittance at a wavelength of 400 nm is 20.0% or less, and the alignment layer / ultraviolet absorber layer includes a region where a liquid crystalline component contained in the positive A layer has penetrated at the positive A layer side interface.

2. The optical laminate according to claim 1, wherein in the thickness direction of the alignment layer / ultraviolet absorber layer, the photoalignment component is relatively more present at the positive A layer side interface compared to the surface not in contact with the positive A layer.

3. The optical laminate according to claim 1, which satisfies the following formula (A) when the alignment layer / ultraviolet absorption layer is analyzed by time-of-flight secondary ion mass spectrometry (TOF-SIMS). Formula (A): I ＡＵ > 1.3 × I ＳＵ (In formula (A), I ＡＵ represents the secondary ion intensity derived from the photoalignment component detected at a position 100 nm from the positive A layer side interface of the alignment layer / ultraviolet absorption layer in the thickness direction on the alignment layer / ultraviolet absorption layer side. I ＳＵ represents the secondary ion intensity derived from the photoalignment component detected at a position 100 nm from the side surface not in contact with the positive A layer of the alignment layer / ultraviolet absorption layer in the thickness direction on the alignment layer / ultraviolet absorption layer side.) 4. The optical laminate according to any one of claims 1 to 3, wherein the complex elastic modulus of the surface of the alignment layer / ultraviolet absorber layer not in contact with the positive A layer is 3.0 GPa or more and 6.5 GPa or less.

5. The optical laminate according to any one of claims 1 to 3, wherein the surface free energy of the positive A layer side interface of the alignment layer / ultraviolet absorber layer is smaller than the surface free energy of the surface of the alignment layer / ultraviolet absorber layer not in contact with the positive A layer.

6. A transfer laminate for transferring the positive A layer and the alignment layer / ultraviolet absorber layer, including a support that detachably supports the positive A layer and the alignment layer / ultraviolet absorber layer on the alignment layer / ultraviolet absorber layer side of the optical laminate according to any one of claims 1 to 3.

7. A polarizing plate including the optical laminate according to any one of claims 1 to 3 and a polarizer.

8. A polarizing plate including a polarizer and, as a transparent protective plate located on at least one side of the polarizer, the optical laminate according to any one of claims 1 to 3.

9. A display panel including the optical laminate according to any one of claims 1 to 3 on a light emitting surface of a display element.

10. The display panel according to claim 9, wherein the alignment layer / ultraviolet absorber layer is located farther from the display element than the positive A layer.

11. A display panel including the polarizing plate according to claim 8 on a light emitting surface of a display element.

12. The display panel according to claim 11, wherein the optical laminate is located farther from the display element than the polarizer.

13. The display panel according to claim 11, wherein the polarizer is located farther from the display element than the optical laminate.

14. The optical laminate is located on the side farther from the display element than the polarizer, and on the side opposite to the optical laminate with respect to the polarizer, the optical laminate or the positive A layer according to any one of claims 1 to 3 is provided. The display panel according to claim 11.

15. An image display device comprising the display panel according to claim 9.

16. An image display device comprising the display panel according to claim 11.

17. An optical laminate comprising a positive A layer and an alignment layer / ultraviolet absorber layer directly contacting the positive A layer, wherein the transmittance of the optical laminate at a wavelength of 380 nm is 1.0% or less, and the transmittance at a wavelength of 400 nm is 20.0% or less, and the following condition (1) is satisfied. Condition (1): The change amount ΔRe of the in-plane retardation at a wavelength of 550 nm before and after the damp heat test (temperature 60°C, relative humidity 95%, 500 hours) of the laminate of the positive A layer and the alignment layer / ultraviolet absorber layer directly contacting the positive A layer is 3.0 nm or less.

18. The optical laminate according to claim 17, further satisfying the following condition (2). Condition (2): After the damp heat test (temperature 60°C, relative humidity 95%, 500 hours) of the laminate of the positive A layer and the alignment layer / ultraviolet absorber layer directly contacting the positive A layer, when the adhesion between the positive A layer and the alignment layer / ultraviolet absorber layer is evaluated by the following adhesion test, the number of cross-cut parts that do not peel off in the grid pattern is 95% or more. (Adhesion test) In JIS K5600-5-6:1999, except that the number of cuts in procedure 7.1.3 is changed from 6 to 11, and the tape peeling in procedure 7.2.6 is repeated 5 times using a new tape each time, in accordance with JIS K5600-5-6:1999, cuts reaching from the alignment layer / ultraviolet absorber layer side to the positive A layer are made under the conditions that the number of cuts in each direction of the grid pattern is 11 and the cut interval is 1 mm, and the adhesion between the positive A layer and the alignment film / ultraviolet absorber layer is evaluated.

19. The optical laminate according to claim 17 or 18, wherein the ultraviolet absorber contained in the alignment layer / ultraviolet absorber layer is an ultraviolet absorbing polymer.

20. The optical laminate according to claim 17 or 18, wherein in the thickness direction of the alignment layer / ultraviolet absorber layer, the photoalignment component is relatively more present at the interface on the positive A layer side compared to the surface on the side not in contact with the positive A layer.

21. The optical laminate according to claim 17 or 18, which satisfies the following formula (A) when the alignment layer / ultraviolet absorption layer is analyzed by time-of-flight secondary ion mass spectrometry (TOF-SIMS). Formula (A): I ＡＵ > 1.3 × I ＳＵ (In formula (A), I ＡＵ represents the secondary ion intensity derived from the photoalignment component detected at a position 100 nm from the positive A layer side interface of the alignment layer / ultraviolet absorption layer in the thickness direction on the alignment layer / ultraviolet absorption layer side. I ＳＵ represents the secondary ion intensity derived from the photoalignment component detected at a position 100 nm from the side surface not in contact with the positive A layer of the alignment layer / ultraviolet absorption layer in the thickness direction on the alignment layer / ultraviolet absorption layer side.) 22. A transfer laminate for use in transferring the positive A layer and the alignment layer / ultraviolet absorbing layer, comprising a support supporting the positive A layer and the alignment layer / ultraviolet absorbing layer in a peelable manner on the alignment layer / ultraviolet absorbing layer side of the optical laminate of claim 17 or 18.

23. A polarizing plate comprising the optical laminate according to claim 17 or 18 and a polarizer.

24. A polarizing plate comprising a polarizer and the optical laminate according to claim 17 or 18 as a transparent protective plate located on at least one side of the polarizer.

25. A display panel comprising the optical laminate according to claim 17 or 18 on a light exit surface of a display element.

26. The display panel according to claim 25, wherein the alignment layer / ultraviolet absorbing layer is located farther from the display element than the positive A layer.

27. A display panel comprising the polarizing plate according to claim 24 on a light exit surface of a display element.

28. The display panel according to claim 27, wherein the optical laminate is located farther from the display element than the polarizer.

29. The display panel according to claim 27, wherein the polarizer is located farther from the display element than the optical laminate.

30. A display panel as described in claim 27, wherein the optical laminate is located farther from the display element than the polarizer, and the display panel has an optical laminate or a positive A layer as described in claim 17 or 18 on the opposite side of the optical laminate with respect to the polarizer.

31. An image display device comprising the display panel according to claim 25.

32. An image display device comprising the display panel according to claim 27.

Images