Optical laminate and method for manufacturing same

Abstract

The invention relates to an optical laminate and a method for manufacturing the same. The present invention addresses the problem of providing an optical laminate which has excellent optical characteristics, and which can simplify the production process and can be made thinner. [Solution] An optical laminate in which a liquid crystal polarizer, a first protective layer, and a light-absorbing anisotropic layer are laminated in this order. The liquid crystal polarizer contains a polymer of a polymerizable liquid crystal compound and a dichroic dye, and has an absorption axis in the horizontal direction with respect to the plane of the liquid crystal polarizer. The light-absorbing anisotropic layer contains a polymer of a polymerizable liquid crystal compound and a dichroic dye, and satisfies the relationships of formulae (1) to (3). And the horizontal orientation layer is directly connected with the liquid crystal polaroid. The liquid crystal polarizer is in direct contact with the first protective layer. The first protective layer is in direct contact with the light-absorbing anisotropic layer, or only a vertical alignment layer is provided between the first protective layer and the light-absorbing anisotropic layer. Azgt, Azgt; (Ax + Ay) / 2 (1) 0.001 < = Ax < = 0.1 (2) Ax (z = 60 DEG) / Ax > = 5 (3)

Description

Technical Field

[0001] The present invention relates to an optical layered body and a method for producing the same. Background Art

[0002] A light-absorbing anisotropic plate is known, which is obtained by laminating anti-diffusion layers on both sides of a light-absorbing anisotropic film in which a dichroic dye and a polymerizable liquid crystal compound are aligned in a vertical direction (for example, Patent Document 1). Also known is a circularly polarizing plate obtained by laminating a polarizing plate and a retardation layer, wherein the polarizing plate has a polarizing film in which a dichroic dye and a polymerizable liquid crystal compound are aligned in a horizontal direction (for example, Patent Document 2).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent No. 7059409

[0006] Patent Document 2: Japanese Patent Application Laid-Open No. 2020-134934 Summary of the Invention

[0007] Problems to be solved by the invention

[0008] When the thickness of the light absorption anisotropic film, the polarizing film, and other layers bonded to these films is reduced, the handleability of these films or layers is reduced. However, there is a demand for further thinning of circularly polarizing plates.

[0009] An object of the present invention is to provide an optical layered body having excellent optical properties and capable of simplifying the production process and achieving thickness reduction, and a method for producing the same.

[0010] Means for solving problems

[0011] The present invention provides the following optical layered body and a method for producing the optical layered body.

[0012] [1] An optical laminate comprising a horizontal alignment layer, a liquid crystal polarizer, a first protective layer, and a light absorption anisotropic layer laminated in this order,

[0013] The liquid crystal polarizer comprises a polymer of a polymerizable liquid crystal compound and a dichroic pigment, and has an absorption axis in a horizontal direction relative to the plane of the liquid crystal polarizer.

[0014] The light-absorbing anisotropic layer comprises a polymer of a polymerizable liquid crystal compound and a dichroic pigment, and satisfies the following relationships (1) to (3):

[0015] The horizontal alignment layer is directly connected to the liquid crystal polarizer.

[0016] The liquid crystal polarizer is directly in contact with the first protective layer.

[0017] The first protective layer is in direct contact with the light-absorbing anisotropic layer, or only a vertical alignment layer is provided between the first protective layer and the light-absorbing anisotropic layer.

[0018] Az>(Ax+Ay) / 2 (1)

[0019] 0.001≤Ax≤0.1 (2)

[0020] Ax(z=60°) / Ax≥5 (3)

[0021] [In formulas (1) to (3),

[0022] Ax, Ay, and Az are the absorbances of the light absorption anisotropic layer at the maximum absorption wavelength within the wavelength range of 380 nm to 780 nm, and represent the absorbances of linearly polarized light vibrating in the x-axis, y-axis, and z-axis directions, respectively.

[0023] Ax(z=60°) is the absorbance at the maximum absorption wavelength within the wavelength range of 380 nm to 780 nm when the light absorption anisotropic layer is rotated 60° about the y-axis, and represents the absorbance of linearly polarized light vibrating along the x-axis.

[0024] The x-axis is any direction within the plane of the light-absorbing anisotropic layer.

[0025] The y-axis is a direction perpendicular to the x-axis in the plane of the light-absorbing anisotropic layer.

[0026] The aforementioned z-axis is a direction perpendicular to the aforementioned x-axis and the aforementioned y-axis.]

[0027] [2] The optical laminate according to [1], further comprising a substrate layer on the side of the horizontal alignment layer opposite to the liquid crystal polarizer side.

[0028] The base layer is in direct contact with the horizontal alignment layer, or only a second protective layer is provided between the base layer and the horizontal alignment layer.

[0029] [3] The optical laminate according to [2], wherein, when the peeling force between the substrate layer and the horizontal alignment layer when the substrate layer and the horizontal alignment layer are directly in contact, or the peeling force between the substrate layer and the second protective layer when only the second protective layer is provided is defined as F0,

[0030] The peeling force F0 is 0.20 N / 25 mm or less.

[0031] [4] The optical laminate according to [3], wherein the peeling force between the horizontal alignment layer and the liquid crystal polarizer is F1,

[0032] The peeling force between the liquid crystal polarizer and the first protective layer is defined as F2.

[0033] When the peeling force between the first protective layer and the light absorbing anisotropic layer is F3,

[0034] The peeling forces F1 to F3 are all greater than the peeling force F0, and are each independently greater than 0.3 N / 25 mm.

[0035] [5] The optical layered body according to [3] or [4], further comprising a third protective layer on the side of the light absorption anisotropic layer opposite to the first protective layer.

[0036] The light absorption anisotropic layer is in direct contact with the third protective layer.

[0037] [6] The optical layered body according to [5], wherein, when the peeling force between the light absorption anisotropic layer and the third protective layer is F4, the peeling force F4 is greater than the peeling force F0 and is greater than 0.3 N / 25 mm.

[0038] [7] The optical laminate according to any one of [3] to [6], further comprising a substrate layer on the side of the horizontal alignment layer opposite to the liquid crystal polarizer side.

[0039] There is only the second protective layer between the substrate layer and the horizontal alignment layer,

[0040] When the peeling force between the second protective layer and the horizontal alignment layer is defined as F5, the peeling force F5 is greater than the peeling force F0 and is greater than 0.3 N / 25 mm.

[0041] [8] The optical laminate according to any one of [1] to [7], further comprising a first liquid crystal retardation layer laminated on the side of the horizontal alignment layer opposite to the liquid crystal polarizer side via a first tackiness adhesive layer.

[0042] The first liquid crystal retardation layer includes a polymer of a polymerizable liquid crystal compound aligned in a horizontal direction with respect to the plane of the first liquid crystal retardation layer.

[0043] [9] The optical laminate according to [8], further comprising a second liquid crystal retardation layer laminated via a second adhesive layer on the side of the horizontal alignment layer opposite to the liquid crystal polarizer side.

[0044] The second liquid crystal retardation layer includes a polymer of a polymerizable liquid crystal compound aligned in a vertical direction with respect to the plane of the second liquid crystal retardation layer.

[0045]

[10] The optical layered body according to any one of [1] to [9], wherein the dichroic dye contained in the liquid crystal polarizer is an azo dye,

[0046] The dichroic dye contained in the light absorption anisotropic layer is an azo dye.

[0047]

[11] A method for producing an optical laminate, wherein a horizontal alignment layer, a liquid crystal polarizer, a first protective layer, and a light absorption anisotropic layer are laminated in this order.

[0048] The liquid crystal polarizer comprises a polymer of a polymerizable liquid crystal compound and a dichroic pigment, and has an absorption axis in a horizontal direction relative to the plane of the liquid crystal polarizer.

[0049] The light-absorbing anisotropic layer comprises a polymer of a polymerizable liquid crystal compound and a dichroic pigment, and satisfies the following relationships (1) to (3):

[0050] The method for manufacturing the optical laminate comprises the following steps:

[0051] A step of preparing a liquid crystal polarizer with a substrate layer, wherein the substrate layer, the horizontal alignment layer, and the liquid crystal polarizer are stacked in sequence, and the horizontal alignment layer is directly in contact with the liquid crystal polarizer;

[0052] a step of directly coating a first protective layer-forming composition for forming the first protective layer on the liquid crystal polarizer with a substrate layer, thereby forming the first protective layer; and

[0053] forming the light absorbing anisotropic layer directly on the first protective layer formed by the step of forming the first protective layer or forming the light absorbing anisotropic layer via a vertical alignment layer;

[0054] The step of forming the aforementioned light absorption anisotropic layer includes the following steps [a1] or [a2]:

[0055] [a1] a step of directly coating a composition for forming a light-absorbing anisotropic layer, which is a composition for forming the light-absorbing anisotropic layer and contains a polymerizable liquid crystal compound and a dichroic dye, on the first protective layer;

[0056] [a2] A step of directly coating a composition for forming a vertical alignment layer on the first protective layer, and a step of directly coating a composition for forming a light-absorbing anisotropic layer on the vertical alignment layer.

[0057] Az>(Ax+Ay) / 2 (1)

[0058] 0.001≤Ax≤0.1 (2)

[0059] Ax(z=60°) / Ax≥5 (3)

[0060] [In formulas (1) to (3),

[0061] Ax, Ay, and Az are the absorbances of the light absorption anisotropic layer at the maximum absorption wavelength within the wavelength range of 380 nm to 780 nm, and represent the absorbances of linearly polarized light vibrating in the x-axis, y-axis, and z-axis directions, respectively.

[0062] Ax(z=60°) is the absorbance at the maximum absorption wavelength within the wavelength range of 380 nm to 780 nm when the light absorption anisotropic layer is rotated 60° about the y-axis, and represents the absorbance of linearly polarized light vibrating along the x-axis.

[0063] The x-axis is any direction within the plane of the light-absorbing anisotropic layer.

[0064] The y-axis is a direction perpendicular to the x-axis in the plane of the light-absorbing anisotropic layer.

[0065] The aforementioned z-axis is a direction perpendicular to the aforementioned x-axis and the aforementioned y-axis.]

[0066]

[12] The method for producing an optical layered body according to

[11] , wherein the step of preparing the liquid crystal polarizer with a substrate layer includes the following [b1] or [b2]:

[0067] [b1] a step of directly coating a composition for forming a horizontal alignment layer on the substrate layer, and a step of directly coating a composition for forming a liquid crystal polarizer containing a polymerizable liquid crystal compound and a dichroic dye as a composition for forming a liquid crystal polarizer on the horizontal alignment layer;

[0068] [b2] A step of directly coating the horizontal alignment layer-forming composition on the second protective layer formed in direct contact with the substrate layer, and a step of directly coating the liquid crystal polarizer-forming composition on the horizontal alignment layer.

[0069]

[13] The method for producing an optical layered body according to

[11] or

[12] , wherein the optical layered body further comprises a third protective layer on the side of the light absorption anisotropic layer opposite to the first protective layer.

[0070] The production method further includes the step of directly applying a third protective layer-forming composition for forming the third protective layer onto the surface of the light-absorbing anisotropic layer on the side opposite to the first protective layer.

[0071]

[14] The method for producing an optical layered body according to any one of

[11] to

[13] , further comprising the step of peeling the substrate layer after the step of forming the light absorption anisotropic layer.

[0072] Effects of the Invention

[0073] According to the present invention, an optical layered body having excellent optical characteristics can be obtained, and the production process of the optical layered body can be simplified, thereby enabling the optical layered body to be thinned. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] [ Figure 1 ] is a cross-sectional view schematically showing an optical layered body according to one embodiment of the present invention.

[0075] [ Figure 2 ] is a cross-sectional view schematically showing an optical layered body according to another embodiment of the present invention.

[0076] [ Figure 3 ] is a cross-sectional view schematically showing an optical layered body according to another embodiment of the present invention.

[0077] [ Figure 4 ] is a cross-sectional view schematically showing an optical layered body according to another embodiment of the present invention.

[0078] [ Figure 5 ] is a cross-sectional view schematically showing the manufacturing process of the optical layered body involved in one embodiment of the present invention.

[0079] [ Figure 6 ] is a cross-sectional view schematically showing the manufacturing process of the optical layered body involved in another embodiment of the present invention.

[0080] Description of Reference Numerals

[0081] 1 to 4 optical laminates, 10 transferred laminate portion, 11 substrate layer, 12 second protective layer, 13 horizontal alignment layer, 14 liquid crystal polarizer, 15 first protective layer, 16 vertical alignment layer, 17 light absorption anisotropic layer, 18 third protective layer, 21 first adhesive layer, 22 first liquid crystal phase difference layer, 23 second adhesive layer, 24 second liquid crystal phase difference layer. DETAILED DESCRIPTION

[0082] Hereinafter, preferred embodiments of the optical layered body and its production method will be described with reference to the accompanying drawings. In this specification, unless otherwise specified, numerical ranges such as "x to y" include upper and lower limits and represent numerical ranges of "x or more and y or less."

[0083] (Optical laminate)

[0084] Figures 1 to 4 The figure schematically shows a cross-sectional view of an optical laminate according to one embodiment of the present invention. The optical laminates 1 to 4 are formed by sequentially stacking a horizontal alignment layer 13, a liquid crystal polarizer 14, a first protective layer 15, and a light-absorbing anisotropic layer 17. The liquid crystal polarizer 14 comprises a polymer of a polymerizable liquid crystal compound and a dichroic pigment, and has an absorption axis in a horizontal direction relative to the plane of the liquid crystal polarizer 14. The light-absorbing anisotropic layer 17 comprises a polymer of a polymerizable liquid crystal compound and a dichroic pigment, and satisfies the relationships of equations (1) to (3) described below.

[0085] In the optical laminates 1 to 4, the horizontal alignment layer 13 is in direct contact with the liquid crystal polarizer 14, and the liquid crystal polarizer 14 is in direct contact with the first protective layer 15. In the optical laminates 1 to 4, the first protective layer 15 is in direct contact with the light absorption anisotropic layer 17 ( Figure 1 、 Figure 3 ), or, only the vertical alignment layer 16 is provided between the first protective layer 15 and the light absorbing anisotropic layer 17 ( Figure 2 、 Figure 4 When the optical laminates 1 to 4 have the vertical alignment layer 16, the vertical alignment layer 16 is in direct contact with the first protective layer 15 and the light absorption anisotropic layer 17 ( Figure 2 、 Figure 4 In this way, the liquid crystal polarizer 14 is directly in contact with the first protective layer 15, and the first protective layer 15 or the vertical alignment layer 16 is directly in contact with the light absorption anisotropic layer 17. This allows the optical layered bodies 1 to 4 to be thinned, and the manufacturing process of the optical layered bodies 1 to 4 can be simplified as described below.

[0086] As described above, the light absorption anisotropic layer 17 contains a polymer of a polymerizable liquid crystal compound and a dichroic dye, and satisfies the relationships of the following formulae (1) to (3).

[0087] Az>(Ax+Ay) / 2 (1)

[0088] 0.001≤Ax≤0.1 (2)

[0089] Ax(z=60°) / Ax≥5 (3)

[0090] [In formulas (1) to (3),

[0091] Ax, Ay, and Az are absorbances of the light absorption anisotropic layer 17 at the maximum absorption wavelength within the wavelength range of 380 nm to 780 nm, and respectively represent absorbances of linearly polarized light vibrating in the x-axis direction, the y-axis direction, and the z-axis direction.

[0092] Ax(z=60°) is the absorbance at the maximum absorption wavelength within the wavelength range of 380 nm to 780 nm when the light absorption anisotropic layer 17 is rotated 60° about the y-axis, and represents the absorbance of linearly polarized light vibrating in the x-axis direction.

[0093] The x-axis is any direction within the plane of the light absorption anisotropic layer 17.

[0094] The y-axis is a direction perpendicular to the x-axis in the plane of the light absorption anisotropic layer 17.

[0095] The z-axis is a direction perpendicular to the x-axis and the y-axis.]

[0096] By making the light-absorbing anisotropic layer 17 satisfy the relationship of the above-mentioned formulas (1) to (3), it can be considered that the absorption axis of the dichroic pigment is oriented along a direction perpendicular to the plane of the light-absorbing anisotropic layer 17. Therefore, the light-absorbing anisotropic layer 17 can effectively allow light from the front direction to pass through and effectively absorb light from the oblique direction.

[0097] The absorbance Az in the z direction in the above formula (1) is difficult to measure because it is measured by causing light to enter the side surface of the light-absorbing anisotropic layer 17. Therefore, when the vibration plane of the linearly polarized light used as the measurement light and the xy plane of the light-absorbing anisotropic layer 17 form an angle of 90°, the absorbance Az in the z direction can be measured by tilting the xy plane of the light-absorbing anisotropic layer 17 at 30° and 60° relative to the vibration plane in the incident direction of the linearly polarized light.

[0098] Specifically, the following method can be used for calculation.

[0099] In a state where the light absorption anisotropic layer 17 is rotated by 30° and 60° about the y-axis as the rotation axis, linearly polarized light identical to the linearly polarized light for which Ax was measured is made incident, whereby the absorbance Ax(z = 30°) and the absorbance Ax(z = 60°) are measured respectively. Similarly, in a state where the light absorption anisotropic layer 17 is rotated by 30° and 60° about the x-axis as the rotation axis, linearly polarized light identical to the linearly polarized light for which Ay was measured is made incident, whereby the absorbance Ay(z = 30°) and the absorbance Ay(z = 60°) are measured respectively.

[0100] At this time, if Ax(z = 30°) < Ax(z = 60°) and Ay(z = 30°) = Ay(z = 60°), then Ax(z = 30°) < Ax(z = 60°) < Ax(z = 90°) = Az, and if Ay(z = 30°) < Ay(z = 60°) and Ax(z = 30°) = Ax(z = 60°), then Ay(z = 30°) < Ay(z = 60°) < Ay(z = 90°) = Az. Therefore, it can be said that the relationship of formula (1) is necessarily satisfied.

[0101] Here, Ax(z = 90°) is the absorbance measured by making linearly polarized light identical to the linearly polarized light for which Ax was measured incident in a state where the light absorption anisotropic layer 17 is rotated by 90° about the y-axis as the rotation axis. Ay(z = 90°) is the absorbance measured by making linearly polarized light identical to the linearly polarized light for which Ax was measured incident in a state where the light absorption anisotropic layer 17 is rotated by 90° about the x-axis as the rotation axis.

[0102] Particularly, in the case where there is no absorption anisotropy in the x-y plane of the light absorption anisotropic layer 17, that is, in the case where Ax and Ay are equal, Ax(z = 30°) = Ay(z = 30°) and Ax(z = 60°) = Ay(z = 60°). Here, let Ax(z = 30°) = Ay(z = 30°) = A(z = 30°), let Ax(z = 60°) = Ay(z = 60°) = A(z = 60°), and let Ax(z = 90°) = Ay(z = 90°) = A(z = 90°). Thus, if A(z = 30°) < A(z = 60°), then the relationship A(z = 30°) < A(z = 60°) < A(z = 90°) = Az is satisfied. Further, if A(z = 30°) > (Ax + Ay) / 2, it can be said that Az necessarily satisfies formula (1).

[0103] The above-mentioned Ax and Ay refer to the absorbance in the front direction of the light absorption anisotropic layer 17. The smaller the values ​​of Ax and Ay, the more accurately the dichroic pigment in the light absorption anisotropic layer 17 is oriented in a direction perpendicular to the plane. Preferably, the values ​​of Ax and Ay are both 0.3 or less. When the values ​​of Ax and Ay are both greater than 0.3, the coloration in the front direction of the light absorption anisotropic layer 17 becomes stronger, and therefore there is a tendency for the front transmission hue to differ when the light absorption anisotropic layer 17 is used in a display device. The values ​​of Ax and Ay are each independently preferably 0.1 or less, more preferably 0.05 or less, and even more preferably 0.02 or less. In addition, the lower limits of the values ​​of Ax and Ay are each independently generally 0.001 or more, and may also be 0.003 or more, or 0.005 or more. In the case of the light absorption anisotropic layer 17 satisfying the relationship of the above formula (2), it can be said that the absorption axis of the dichroic dye is precisely oriented in a direction perpendicular to the plane of the light absorption anisotropic layer 17. When the absorbance Ax is greater than 0.3, the coloring in the front direction of the light absorption anisotropic layer 17 becomes strong, and therefore, when combined with a circularly polarizing plate and applied to an organic EL display device, for example, there is a tendency for the front hue to be different.

[0104] In the light absorption anisotropic layer 17, Ax and Ay are preferably the same value. If Ax and Ay are different, the light absorption anisotropic layer 17 has absorption anisotropy within the plane, and when the light absorption anisotropic layer 17 is used in a display device, the front hue tends to be more colored.

[0105] As for Ax(z=60°) / Ax in the above formula (3), the larger the value, the better the light absorption anisotropy. They are each independently preferably greater than 5, more preferably 7 or greater, further preferably 10 or greater, and preferably 50 or less.

[0106] The light absorption anisotropic layer 17 satisfying the relationship of the above formula (3) is considered to have the absorption axis of the dichroic dye oriented in a direction perpendicular to its plane. Therefore, the light absorption anisotropic layer 17 can effectively absorb light from an oblique direction.

[0107] Ax(z=60°) refers to the oblique absorbance of the light-absorbing anisotropic layer 17 and can be appropriately selected based on the amount of light leaking obliquely from the display device. Ax(z=60°) is preferably 1.0 or less, more preferably 0.5 or less, and even more preferably 0.3 or less. The lower limit is typically 0.001 or greater, but may be 0.003 or greater, and may be 0.01 or greater depending on necessity.

[0108] The light-absorbing anisotropic layer 17 satisfying the relationships of the above-mentioned formulas (1) to (3) can be adjusted by, for example, the thickness of the light-absorbing anisotropic layer 17, the conditions of the manufacturing process of the light-absorbing anisotropic layer 17, the type or content of the dichroic dye and the polymerizable liquid crystal compound contained in the light-absorbing anisotropic layer-forming composition used to obtain the light-absorbing anisotropic layer 17, etc.

[0109] The optical laminates 1 to 4 may further include a substrate layer 11 ( Figure 1 、 Figure 2 In this case, it is preferred that the substrate layer 11 and the horizontal alignment layer 13 are directly in contact with each other, or that only the second protective layer 12 is provided between the substrate layer 11 and the horizontal alignment layer 13 ( Figure 2 ) This makes it possible to reduce the thickness of the optical layered bodies 1 to 4 and also to simplify the production process of the optical layered bodies 1 to 4 as will be described later.

[0110] In the optical laminates 1 to 4, the peel force F0 between the substrate layer 11 and the horizontal alignment layer 13 when the substrate layer 11 and the horizontal alignment layer 13 are directly in contact, or the peel force F0 between the substrate layer 11 and the second protective layer 12 when only the second protective layer 12 is present between the substrate layer 11 and the horizontal alignment layer 13 (i.e., the substrate layer 11 and the second protective layer 12 are directly in contact) is preferably 0.20 N / 25 mm or less, and may be 0.18 N / 25 mm or less, 0.15 N / 25 mm or less, 0.12 N / 25 mm or less, or 0.10 N / 25 mm or less. The peel force F0 may be 0.01 N / 25 mm or more, 0.03 N / 25 mm or more, or 0.05 N / 25 mm or more.

[0111] The optical stacks 1 to 4 can be used by stacking components constituting display devices such as image display elements or front panels (hereinafter also referred to as "display device components"). In the case where the optical stacks 1 to 4 have a substrate layer 11, sometimes after stacking the optical stacks 1 to 4 on the display device components, the substrate layer 11 is peeled off, thereby transferring the stack portion 10 (hereinafter also referred to as "transferred stack portion 10") other than the substrate layer 11 in the optical stacks 1 to 4 to the display device components ( Figure 1 、 Figure 2 When the peeling force F0 is within the above range, the base material layer 11 can be easily peeled from the optical layered bodies 1 to 4. The peeling force F0 can be measured by the method described in the examples below.

[0112] In the optical laminates 1 to 4, the peeling force F1 between the horizontal alignment layer 13 and the liquid crystal polarizer 14, the peeling force F2 between the liquid crystal polarizer 14 and the first protective layer 15, and the peeling force F3 between the first protective layer 15 and the light absorption anisotropic layer 17 are preferably all greater than the peeling force F0. Furthermore, the peeling forces F1 to F3 are each independently preferably greater than 0.3N / 25mm, more preferably greater than 0.5N / 25mm, and further preferably greater than 1.0N / 25mm. The peeling forces F1 to F3 can each independently be less than 10N / 25mm. In the case where the first protective layer 15 and the light absorption anisotropic layer 17 are directly in contact in the optical laminates 1 to 4, the peeling force F3 is the peeling force between the first protective layer 15 and the light absorption anisotropic layer 17. When the optical laminates 1 to 4 include only the perpendicular alignment layer 16 between the first protective layer 15 and the light-absorbing anisotropic layer 17, the peel force F3 is the peel force between the first protective layer 15 and the perpendicular alignment layer 16, or between the perpendicular alignment layer 16 and the light-absorbing anisotropic layer 17. By ensuring that the peel forces F1 to F3 satisfy the aforementioned relationship, it is possible to suppress the occurrence of lifting or separation between the layers constituting the transferred laminated portion 10, or the occurrence of breakage in the transferred laminated portion 10, when the substrate layer 11 is peeled from the optical laminates 1 to 4. The peel forces F1 to F3 can be measured using the method described in the Examples below.

[0113] The optical laminates 1 to 4 may further include a third protective layer 18 on the side of the light absorption anisotropic layer 17 opposite to the first protective layer 15 ( Figures 1 to 4 In this case, the light absorption anisotropic layer 17 is preferably in direct contact with the third protective layer 18. This can reduce the thickness of the optical layered bodies 1 to 4 and simplify the production process of the optical layered bodies 1 to 4 as described below.

[0114] In the optical laminates 1 to 4, the peeling force F4 between the light absorption anisotropic layer 17 and the third protective layer 18 is preferably greater than the peeling force F0 and greater than 0.3N / 25mm. The peeling force F4 is more preferably greater than 0.5N / 25mm, and further preferably greater than 1.0N / 25mm. The peeling force F4 can be 10N / 25mm or less. By making the peeling force F4 satisfy the above-mentioned relationship, when peeling the substrate layer 11 from the optical laminates 1 to 4, it is possible to suppress the occurrence of floating or peeling between the light absorption anisotropic layer 17 and the third protective layer 18, or the occurrence of breakage in the transferred laminated portion 10. The peeling force F4 can be measured using the method described in the examples described later.

[0115] In the case where only the second protective layer 12 is provided between the substrate layer 11 and the horizontal alignment layer 13 in the optical laminates 1 to 4 ( Figure 2 、 Figure 4), the peeling force F5 between the second protective layer 12 and the horizontal orientation layer 13 is preferably greater than the peeling force F0 and greater than 0.3N / 25mm. The peeling force F5 is more preferably greater than 0.5N / 25mm, and further preferably greater than 1.0N / 25mm. The peeling force F5 can be 10N / 25mm or less. By making the peeling force F5 satisfy the above-mentioned relationship, when peeling the substrate layer 11 from the optical laminate 1 to 4, it is possible to suppress the occurrence of floating or peeling between the second protective layer 12 and the horizontal orientation layer 13, or the occurrence of breakage in the transferred laminated portion 10. The peeling force F5 can be measured using the method described in the embodiments described later.

[0116] The optical stack 3 and 4 may further include a phase difference element. The phase difference element may be a phase difference layer as a stretched film or a liquid crystal phase difference layer containing a polymer of a polymerizable liquid crystal compound. For example, the optical stack 3 and 4 may be as follows: Figure 3 and Figure 4 As shown, the first liquid crystal retardation layer 22 may be provided on the side of the horizontal alignment layer 13 opposite to the liquid crystal polarizer 14, and the second liquid crystal retardation layer 24 may be provided on the side of the first liquid crystal retardation layer 22 opposite to the horizontal alignment layer 13. The optical laminates 3 and 4 may be elliptically polarizing plates or circularly polarizing plates (hereinafter, both are collectively referred to as "elliptically polarizing plates"), or may be elliptically polarizing plates that function as antireflection films.

[0117] The optical laminates 3 and 4 preferably do not have the base material layer 11. When the optical laminates 3 and 4 have the second protective layer 12 ( Figure 4 ), the first liquid crystal retardation layer 22 can be laminated on the side of the second protective layer 12 opposite to the horizontal alignment layer 13 side. The first liquid crystal retardation layer 22 can also be laminated on the horizontal alignment layer 13 or the second protective layer 12 via the first adhesive layer 21. In this case, the first adhesive layer 21 is preferably in direct contact with the first liquid crystal retardation layer 22 and the horizontal alignment layer 13 or the second protective layer 12. The second liquid crystal retardation layer 24 can also be laminated on the first liquid crystal retardation layer 22 via the second adhesive layer 23. In this case, the second adhesive layer 23 is preferably in direct contact with the second liquid crystal retardation layer 24 and the first liquid crystal retardation layer 22 or the first alignment layer described later.

[0118] The optical stack 3 and 4 may have a first orientation layer (not shown) directly in contact with the first liquid crystal phase difference layer 22. The first orientation layer may be arranged between the horizontal orientation layer 13 or the second protective layer 12 and the first liquid crystal phase difference layer 22. In the case where the optical stack 3 and 4 have a first adhesive layer 21, the first orientation layer may be arranged between the first adhesive layer 21 and the first liquid crystal phase difference layer 22. Alternatively, the first orientation layer may be arranged on the side of the first liquid crystal phase difference layer 22 opposite to the horizontal orientation layer 13 side. The optical stack 3 and 4 may have a second orientation layer (not shown) directly in contact with the second liquid crystal phase difference layer 24. The second orientation layer is preferably arranged on the side of the second liquid crystal phase difference layer 24 opposite to the first liquid crystal phase difference layer 22 side, but may also be arranged on the first liquid crystal phase difference layer 22 side of the second liquid crystal phase difference layer 24.

[0119] The optical laminates 3 and 4 are elliptically polarizing plates. In order to achieve a high degree of anti-reflection function, the first liquid crystal phase difference layer 22, or the combination of the first liquid crystal phase difference layer 22 and the second liquid crystal phase difference layer 24 preferably has a λ / 4 plate function (i.e., a phase difference function of π / 2) in the entire visible light domain. The first liquid crystal phase difference layer 22 or the second liquid crystal phase difference layer 24 can be a λ / 4 liquid crystal phase difference layer with a λ / 4 plate function, or a λ / 4 liquid crystal phase difference layer with reverse wavelength dispersion. The first liquid crystal phase difference layer 22 and the second liquid crystal phase difference layer 24 can also be a combination of a λ / 2 liquid crystal phase difference layer with a λ / 2 plate function and a λ / 4 liquid crystal phase difference layer with positive wavelength dispersion. For example, the first liquid crystal phase difference layer 22 can be a λ / 2 liquid crystal phase difference layer with positive wavelength dispersion, and the second liquid crystal phase difference layer 24 can be a λ / 4 liquid crystal phase difference layer with positive wavelength dispersion.

[0120] The optical stacks 3 and 4, which are elliptically polarizing plates, may include a positive C plate having anisotropy in the thickness direction to compensate for the function of preventing reflection in oblique directions. In the optical stacks 3 and 4, for example, the first liquid crystal retardation layer 22 may be a λ / 4 liquid crystal retardation layer with reverse wavelength dispersion, and the second liquid crystal retardation layer 24 may be a positive C plate. The optical stacks 3 and 4 may also include a positive C plate in addition to the first and second liquid crystal retardation layers 22 and 24.

[0121] The details of each layer contained in the optical layered bodies 1 to 4 will be described later.

[0122] (Method for producing an optical laminate)

[0123] Figure 5 and Figure 6This is a cross-sectional view schematically illustrating a manufacturing process of an optical laminate according to one embodiment of the present invention. The method for manufacturing the optical laminate is, for example, the method for manufacturing the optical laminates 1 to 4 described above, in which a horizontal alignment layer 13, a liquid crystal polarizer 14, a first protective layer 15, and a light absorption anisotropic layer 17 are sequentially laminated.

[0124] As described above, the liquid crystal polarizer 14 includes a polymer of a polymerizable liquid crystal compound and a dichroic dye, and has an absorption axis in the horizontal direction relative to the plane of the liquid crystal polarizer 14. As described above, the light absorption anisotropic layer 17 includes a polymer of a polymerizable liquid crystal compound and a dichroic dye, and satisfies the relationships of the above-mentioned formulas (1) to (3).

[0125] The optical laminates 1 to 4 may further include the aforementioned substrate layer 11, the second protective layer 12, the vertical alignment layer 16, and / or the third protective layer 18. The optical laminates 1 to 4 may further include the aforementioned first liquid crystal phase difference layer 22, or the aforementioned first alignment layer. The optical laminates 1 to 4 may further include the aforementioned second liquid crystal phase difference layer 24, or the aforementioned second alignment layer. In the case where the optical laminates 3 and 4 include the first liquid crystal phase difference layer 22 ( Figure 3 、 Figure 4 ), and may further include a first adhesive layer 21. When the optical laminate 3 or 4 includes a second liquid crystal phase difference layer 24 in addition to the first liquid crystal phase difference layer 22 ( Figure 3 、 Figure 4 ), and may further include a second adhesive layer 23.

[0126] The method for producing the optical layered bodies 1 to 4 includes the following steps:

[0127] A process for preparing a liquid crystal polarizer with a substrate layer, wherein the substrate layer 11, the horizontal alignment layer 13 and the liquid crystal polarizer 14 are stacked in sequence, and the horizontal alignment layer 13 is directly in contact with the liquid crystal polarizer 14 ( Figure 5 (b) Figure 6 (c));

[0128] A step of directly coating a first protective layer-forming composition for forming a first protective layer 15 on the liquid crystal polarizer 14 of the liquid crystal polarizer with a substrate layer to form the first protective layer 15 ( Figure 5 (c) Figure 6 (d)); and

[0129] On the first protective layer 15 formed by the step of forming the first protective layer 15, a step of forming the light absorption anisotropic layer 17 directly or via the vertical alignment layer 16 is performed ( Figure 5 (d) Figure 6 (f)).

[0130] The process of forming the light absorption anisotropic layer 17 includes the following step [a1] or [a2].

[0131] [a1] A step of directly applying a composition for forming the light-absorbing anisotropic layer 17 , which is a composition containing a polymerizable liquid crystal compound and a dichroic dye, onto the first protective layer 15 .

[0132] [a2] A step of directly coating a composition for forming a vertical alignment layer 16 on the first protective layer 15 , and a step of directly coating a composition for forming a light-absorbing anisotropic layer on the vertical alignment layer 16 .

[0133] Through the above-mentioned step [a1], the light absorption anisotropic layer 17 ( Figure 5 (d)). Through the above-mentioned process [a2], a vertical alignment layer 16 is formed on the first protective layer 15 ( Figure 6 (e)), a light absorption anisotropic layer 17 is formed on the vertical alignment layer 16 ( Figure 6 (f)).

[0134] In the method for producing optical stacks 1-4, the first protective layer 15 is formed so as to be in direct contact with the liquid crystal polarizer 14. Through the above-described steps [a1] or [a2], the light-absorbing anisotropic layer 17 is formed directly on the first protective layer 15 or via the vertical alignment layer 16. Consequently, it is possible to produce optical stacks 1 and 3 in which the liquid crystal polarizer 14 is in direct contact with the first protective layer 15 and the first protective layer 15 is in direct contact with the light-absorbing anisotropic layer 17; or optical stacks 2 and 4 in which the liquid crystal polarizer 14 is in direct contact with the first protective layer 15 and only the vertical alignment layer 16 is provided between the first protective layer 15 and the light-absorbing anisotropic layer 17. This allows for a reduction in the thickness of the optical stacks 1-4 and simplifies the production process for the optical stacks 1-4.

[0135] The step of preparing the polarizer with a substrate layer may include the following step [b1] or [b2].

[0136] [b1] A process of directly coating a horizontal alignment layer forming composition for forming a horizontal alignment layer 13 on the substrate layer 11, and a process of directly coating a liquid crystal polarizer forming composition containing a polymerizable liquid crystal compound and a dichroic pigment as a composition for forming a liquid crystal polarizer 14 on the horizontal alignment layer 13.

[0137] [b2] A step of directly coating the horizontal alignment layer-forming composition on the second protective layer 12 formed in direct contact with the base layer 11 , and a step of directly coating the liquid crystal polarizer-forming composition on the horizontal alignment layer 13 .

[0138] Through the above-mentioned step [b1], a horizontal alignment layer 13 ( Figure 5 (a)), a liquid crystal polarizer 14 is formed on the horizontal alignment layer 13 ( Figure 5 (b)). Thus, the optical laminate 1, 3 can be obtained in which the substrate layer 11 is directly in contact with the horizontal alignment layer 13 and the horizontal alignment layer 13 is directly in contact with the liquid crystal polarizer 14. In addition, by the above-mentioned step [b2], the horizontal alignment layer 13 is formed on the second protective layer 12 formed on the substrate layer 11 ( Figure 6 (b)), a liquid crystal polarizer 14 is formed on the horizontal alignment layer 13 ( Figure 6 (c)). Thus, the optical laminates 2 and 4 can be obtained, in which only the second protective layer 12 is provided between the substrate layer 11 and the horizontal alignment layer 13 and the horizontal alignment layer 13 is in direct contact with the liquid crystal polarizer 14.

[0139] The step [b2] may further include the step of directly coating the second protective layer-forming composition for forming the second protective layer 12 on the base material layer 11 to form the second protective layer 12 ( Figure 6 (a)).

[0140] The method for producing the optical layered bodies 1 to 4 may further include the step of directly applying a third protective layer-forming composition for forming the third protective layer 18 onto the surface of the light-absorbing anisotropic layer 17 opposite to the first protective layer 15. This allows the production of optical layered bodies 1 to 4 in which the light-absorbing anisotropic layer 17 and the third protective layer 18 are in direct contact.

[0141] The method for producing the optical layered bodies 1 to 4 may further include a step of peeling the substrate layer 11 after the step of forming the light-absorbing anisotropic layer 17, for example, after the optical layered bodies 1 and 2 are obtained. The step of peeling the substrate layer 11 may also be performed after laminating the adhesive sheet on the surface of the optical layered bodies 1 and 2 opposite to the substrate layer 11. The adhesive sheet is a sheet in which a separator is peelably laminated to an adhesive layer, and the adhesive layer side is bonded to the optical layered bodies 1 and 2.

[0142] The method for producing the optical laminates 3 and 4 may further include the step of providing the first liquid crystal retardation layer 22, or the first liquid crystal retardation layer 22 and the second liquid crystal retardation layer 24, on the liquid crystal polarizer 14 or the second protective layer 12 of the optical laminates 1 and 2 (hereinafter, this step is also referred to as the "step of forming a phase difference element"). In this case, the step of peeling off the base material layer 11 is preferably performed between the step of forming the light absorption anisotropic layer 17 and the step of forming the phase difference element.

[0143] When the optical stacks 3 and 4 include the first liquid crystal retardation layer 22 and the second liquid crystal retardation layer 24, the first liquid crystal retardation layer 22 and the second liquid crystal retardation layer 24 may be sequentially provided on the liquid crystal polarizer 14 or the second protective layer 12 of the optical stacks 1 and 2. Alternatively, after forming a stack of the first liquid crystal retardation layer 22 and the second liquid crystal retardation layer 24, the stack may be attached to the horizontal alignment layer 13 or the second protective layer 12 of the optical stacks 1 and 2. The first liquid crystal retardation layer 22 and the second liquid crystal retardation layer 24 may be laminated with the second tack adhesive layer 23 interposed therebetween, or the second orientation layer and the second liquid crystal retardation layer may be sequentially formed on the first liquid crystal retardation layer 22 or the first orientation layer.

[0144] Hereinafter, the layers included in the optical layered body and the components contained in the layers will be described in detail.

[0145] (Horizontal Alignment Layer)

[0146] The horizontal alignment layer has an alignment control force that enables the polymerizable liquid crystal compound in the liquid crystal polarizer-forming composition used to form the liquid crystal polarizer to align horizontally relative to the plane of the liquid crystal polarizer. In this specification, the so-called polymerizable liquid crystal compound is aligned in the horizontal direction, which means that the long axis of the polymerizable liquid crystal compound is aligned in the horizontal direction. The so-called horizontal direction means 0°±20° relative to the plane of the liquid crystal polarizer. The state of liquid crystal orientation varies depending on the properties of the horizontal alignment layer and the polymerizable liquid crystal compound, and their combination can be selected arbitrarily.

[0147] Examples of the horizontal alignment layer include a polymer alignment layer formed from an aligning polymer, a photoalignment layer formed from a photoalignment polymer, and a groove alignment layer having a concave-convex pattern and a plurality of grooves (grooves) on the layer surface. From the perspectives of the accuracy and quality of the alignment angle, the horizontal alignment layer is preferably a photoalignment layer. Examples of the above-mentioned alignment layers constituting the horizontal alignment layer include the alignment layers described below in the vertical alignment layer.

[0148] The thickness of the horizontal alignment layer is generally in the range of 10 nm to 10,000 nm, preferably 10 nm to 2,500 nm, more preferably 10 nm to 1,000 nm, further preferably 10 nm to 500 nm, and particularly preferably 20 nm to 250 nm. The thickness of the horizontal alignment layer can be measured using a laser microscope, an ellipsometer, or the like.

[0149] The horizontal alignment layer-forming composition is preferably a composition for forming a photoalignment layer, and includes a photoalignment polymer, a photoalignment oligomer, or a photoalignment monomer as a polymer having a photoreactive group. Examples of the photoreactive group include the photoreactive groups described below for the vertical alignment layer.

[0150] The molecular weight of the photo-alignment polymer is a weight-average molecular weight calculated on a polystyrene basis, as determined by gel permeation chromatography (GPC), and is preferably from 10,000 to 1,000,000, more preferably from 15,000 to 20,000, more preferably from 500,000 to 250,000, and more preferably from 500,000 to 250,000. When the weight-average molecular weight of the photo-alignment polymer is within this range, solvent resistance is improved, high adhesion to a liquid crystal polarizer subsequently formed on the horizontal alignment layer is easily ensured, and a horizontal alignment layer exhibiting excellent liquid crystal alignment ability is obtained.

[0151] The photoalignment polymer is further preferably a (meth)acrylic polymer. In particular, when the polymerizable liquid crystal compound forming the liquid crystal polarizer has a (meth)acryloyl group as a polymerizable group, a (meth)acrylic polymer has excellent affinity and can be expected to improve the adhesion between the liquid crystal polarizer and the horizontal alignment layer. In this specification, polymers that have the largest proportion of (meth)acrylic-based structural units, such as (meth)acrylate units and (meth)acrylamide units, among all structural units constituting the polymer backbone are collectively referred to as "(meth)acrylic polymers."

[0152] The content of the photo-alignment polymer in the horizontal alignment layer forming composition can be appropriately determined according to the type of photo-alignment polymer used, the thickness of the desired horizontal alignment layer, etc. As long as the photo-alignment polymer used can be completely dissolved, there is no particular limitation, and its content (concentration) is preferably 1.0 to 25.0% by mass relative to the total mass of the horizontal alignment layer forming composition, and more preferably 2.5 to 22.5% by mass. In the horizontal alignment layer forming composition, the photo-alignment polymer may be only one kind or a combination of two or more kinds, but when two or more kinds are included, it is preferred that their total content is within the above range.

[0153] The composition for forming a horizontal alignment layer may further contain a compound having an active hydrogen-reactive group in addition to the photo-alignment polymer (hereinafter also referred to as "compound (AH)"). In this specification, the so-called "active hydrogen-reactive group" refers to a group that is reactive with groups containing active hydrogen, such as a carboxyl group (-COOH), a hydroxyl group (-OH), an amino group (-NH2), and a mercapto group (-SH). If the horizontal alignment layer is formed by a composition for forming a horizontal alignment layer containing compound (AH), it is easy to control the adhesion with the coating layer (in this embodiment, the substrate layer or the second protective layer) to which the horizontal alignment layer composition is to be coated, and the adhesion between the coating layer and the horizontal alignment layer can be improved.

[0154] Examples of the active hydrogen-reactive group include an epoxy group, a glycidyl group, an oxazoline group, a carbodiimide group, an aziridine group, an imide group, an alkoxysilyl group, an isocyanate group, an isothiocyanate group, and a maleic anhydride group. Among these, from the viewpoint of adhesion, the compound (AH) preferably has at least one group selected from the group consisting of an alkoxysilyl group and an isocyanate group, and more preferably has an alkoxysilyl group.

[0155] The number of active hydrogen-reactive groups possessed by compound (AH) is 1 or more. When there are multiple active hydrogen-reactive groups, the multiple active hydrogen-reactive groups may be the same or different.

[0156] Compound (AH) preferably has an active hydrogen-containing group in addition to the active hydrogen-reactive group. In this specification, the so-called "active hydrogen-containing group" refers to a functional group containing active hydrogen. By providing compound (AH) with an active hydrogen-containing group, the adhesion between the horizontal alignment layer and the liquid crystal polarizer can be improved.

[0157] Examples of the active hydrogen-containing group include a hydroxyl group, a carboxyl group, an amino group, a mercapto group, a primary amide group, a secondary amide group, and a hydrazide group. From the standpoint of reactivity and adhesion, the compound (AH) preferably has at least one group selected from the group consisting of a hydroxyl group, an amino group, and a mercapto group, and more preferably has at least one of an amino group and a mercapto group.

[0158] The number of active hydrogen-containing groups possessed by compound (AH) is at least 1. When there are multiple active hydrogen-containing groups, the multiple active hydrogen-containing groups may be the same or different.

[0159] Compound (AH) is, for example, a silane coupling agent. Using a silane coupling agent as compound (AH) facilitates controlling the adhesion between the coating layer to be coated with the horizontal alignment layer-forming composition and / or the liquid crystal polarizer and the horizontal alignment layer. The silane coupling agent may be used alone or in combination of two or more.

[0160] As the silane coupling agent, compounds known in the art can be used. Specifically, nonionic silane compounds described as alignment promoters that can be included in the composition for forming a light-absorbing anisotropic layer described later can be mentioned.

[0161] In the case where compound (AH) is a silane coupling agent, the silane coupling agent preferably has a group containing active hydrogen. Specifically, it is more preferred to have at least one functional group selected from the group consisting of an amino group (primary, secondary), a hydroxyl group and a sulfhydryl group, more preferably a primary amino group or a secondary amino group, and further preferably a compound containing Si elements having the above-mentioned at least one functional group and at least one alkoxysilyl group or a silanol group. Amino group (primary, secondary), hydroxyl group and sulfhydryl group have polarity, and by appropriately selecting these functional groups, the adhesion of the obtained horizontal alignment layer to the liquid crystal polarizer can be controlled. From such a viewpoint, the silane coupling agent preferably has an alkoxysilyl group and the above-mentioned at least one functional group. The above-mentioned functional group can appropriately have a substituent or a protecting group in order to control the reactivity of the silane coupling agent. Examples of silane coupling agents having a protecting group include KBE-9103P (ketimine type) and X-12-1172ES (aldimine type) manufactured by Shin-Etsu Chemical Co., Ltd. as amino-protected type, and X-12-1056ES as mercapto-protected type.

[0162] The content of the compound (AH) in the horizontal alignment layer forming composition can be appropriately determined according to the type of compound (AH), the type of the layer to be coated with the horizontal alignment layer forming composition, the surface state, the composition of the liquid crystal polarizer, etc. With respect to 100 parts by mass of the photo-alignment polymer, the content of the compound (AH) is, for example, preferably 1 part by mass or more and 30 parts by mass or less, more preferably 2.5 parts by mass or more and 25 parts by mass or less, further preferably 5.0 parts by mass or more, and more preferably 23 parts by mass or less. If the content of the compound (AH) is within the above range, it can be expected that the adhesion of the horizontal alignment layer to the coated layer and / or the liquid crystal polarizer can be improved.

[0163] The composition for forming the horizontal alignment layer generally contains a solvent. The solvent is not particularly limited as long as it can dissolve the components contained in the composition for forming the horizontal alignment layer. Examples include water; alcohol solvents such as methanol, ethanol, ethylene glycol, isopropyl alcohol, propylene glycol, methyl cellosolve, butyl cellosolve, and propylene glycol monomethyl ether; ester solvents such as ethyl acetate, butyl acetate, ethylene glycol methyl ether acetate, γ-butyrolactone, propylene glycol methyl ether acetate, and ethyl lactate; ketone solvents such as acetone, methyl ethyl ketone, cyclopentanone, cyclohexanone, methyl amyl ketone, and methyl isobutyl ketone; aliphatic hydrocarbon solvents such as pentane, hexane, and heptane; aromatic hydrocarbon solvents such as toluene and xylene; nitrile solvents such as acetonitrile; ether solvents such as tetrahydrofuran and dimethoxyethane; and chlorine-substituted hydrocarbon solvents such as chloroform and chlorobenzene. These solvents can be used alone or in combination of two or more.

[0164] The composition for forming a horizontal alignment layer may contain, in addition to the above-mentioned components, any other components as long as the properties of the horizontal alignment layer are not significantly impaired. Examples of such components include polymer materials and photosensitizers.

[0165] The composition for forming a horizontal alignment layer can be prepared, for example, by dissolving a photoalignment polymer (or an oligomer or monomer that can constitute the photoalignment polymer), a compound (AH), and other components used as needed in a solvent. The horizontal alignment layer, which is a photoalignment layer, can be formed using the composition for forming a horizontal alignment layer by the method described below in the section on the vertical alignment layer.

[0166] (Liquid crystal polarizer)

[0167] Liquid crystal polarizers contain a polymer of a polymerizable liquid crystal compound and a dichroic pigment, and have an absorption axis horizontal to the plane of the liquid crystal polarizer. When unpolarized light is incident on the liquid crystal polarizer, it transmits linearly polarized light with a vibration plane perpendicular to the absorption axis. The liquid crystal polarizer has an absorption axis and a transmission axis perpendicular to it within its plane, absorbing polarized light components parallel to the absorption axis and transmitting polarized light components parallel to the transmission axis. Liquid crystal polarizers exhibit polarization by utilizing the anisotropic absorption of light by the dichroic pigment encapsulated in the polymer of the polymerizable liquid crystal compound.

[0168] The liquid crystal polarizer is a liquid crystal cured film obtained by coating a liquid crystal polarizer-forming composition onto a substrate layer or a second protective layer formed on the substrate layer, and polymerizing a polymerizable liquid crystal compound while the dichroic dye contained in the liquid crystal polarizer-forming composition is oriented. The polymer of the dichroic dye and the polymerizable liquid crystal compound contained in the liquid crystal polarizer is oriented horizontally with respect to the plane of the liquid crystal polarizer.

[0169] The thickness of the liquid crystal polarizer is preferably 0.1 μm to 5 μm, more preferably 0.3 μm to 4 μm, and even more preferably 0.5 μm to 3 μm. If the thickness is less than this range, the necessary light absorption may not be achieved. If the thickness is greater than this range, the alignment control force of the horizontal alignment layer may be reduced, and alignment defects may be more likely to occur.

[0170] For liquid crystal polarizers, the ratio of the absorbance A1(λ) in the orientation direction for light of wavelength λ [nm] to the absorbance A2(λ) in the direction perpendicular to the orientation direction (dichroic ratio; A1 / A2) is preferably 7 or greater, more preferably 20 or greater, and even more preferably 40 or greater. The larger the dichroic ratio, the better the absorption selectivity. While it depends on the type of dichroic pigment, when the liquid crystal polarizer is cured in a nematic liquid crystal phase, the dichroic ratio is approximately 5 to 10.

[0171] By mixing two or more dichroic pigments with different absorption wavelengths, liquid crystal polarizers with various hues can be produced, allowing for absorption across the entire visible light range. By creating liquid crystal polarizers with such absorption characteristics, their applications can be expanded to a wide range.

[0172] As the dichroic pigment used in the liquid crystal polarizer, the dichroic pigment used in the formation of the light absorption anisotropic layer described later can be cited. The dichroic pigment is preferably an azo pigment. As the polymerizable liquid crystal compound, a rod-shaped liquid crystal compound, a disc-shaped liquid crystal compound and a mixture thereof can be used. The polymerizable liquid crystal compound can be a thermotropic liquid crystal compound that exhibits a nematic liquid crystal phase, or a thermotropic liquid crystal compound that exhibits a smectic liquid crystal phase. The polymerizable liquid crystal compound can also use the polymerizable liquid crystal compound used in the formation of the light absorption anisotropic layer described later.

[0173] (1st protective layer, 2nd protective layer, 3rd protective layer)

[0174] The first protective layer, the second protective layer and the third protective layer (hereinafter, they are also collectively referred to as "protective layers") are resin cured layers, preferably resin layers other than the adhesive layer. The adhesive layer is a layer for bonding two pre-formed (molded) layers together, while the protective layer is not a layer for bonding two pre-formed (molded) layers together. In the case where the adhesive layer is a resin cured layer, after arranging an adhesive (adhesive adhesive layer before curing) between the two layers to be stacked, the adhesive is cured to form an adhesive layer between the two layers. On the other hand, in the case where there is a protective layer between the two layers to be stacked, at least one of the two layers is formed on the protective layer after the protective layer-forming composition for forming the protective layer is cured (that is, after the protective layer is formed). The protective layer is preferably a coating layer formed by coating on the layer constituting the optical laminate.

[0175] The first and second protective layers can inhibit diffusion of the dichroic pigment contained in the liquid crystal polarizer and prevent damage to the liquid crystal polarizer. The first protective layer is preferably a coating layer formed by coating on the liquid crystal polarizer. The second protective layer is preferably a coating layer formed by coating on the substrate layer.

[0176] The third protective layer can suppress the diffusion of the dichroic dye contained in the light-absorbing anisotropic layer and suppress damage to the light-absorbing anisotropic layer. The third protective layer is preferably a coating layer formed by coating on the light-absorbing anisotropic layer.

[0177] The first protective layer can be formed from a first protective layer-forming composition, the second protective layer can be formed from a second protective layer-forming composition, and the third protective layer can be formed from a third protective layer-forming composition (hereinafter, the first protective layer-forming composition, the second protective layer-forming composition, and the third protective layer-forming composition are collectively referred to as the "protective layer-forming composition."). Examples of the protective layer-forming composition include a layer formed from a resin composition containing a water-soluble polymer (hereinafter also referred to as a "resin composition containing a water-soluble polymer"), a photocurable composition containing a photocurable resin, and the like. Water-soluble polymers generally have a polarity significantly different from that of dichroic dyes and are therefore excellent in preventing the diffusion of dichroic dyes. Therefore, the protective layer is preferably a layer formed from a resin composition containing a water-soluble polymer.

[0178] The refractive index of the protective layer can be adjusted, for example, by the type of polymer contained in the protective layer-forming composition. The refractive index of the protective layer can be selected in consideration of the refractive index of the layers contained in the optical laminate (e.g., the horizontal alignment layer, the liquid crystal polarizer, and the light absorption anisotropic layer) in order to change the light transmittance of the optical laminate.

[0179] Examples of the water-soluble polymer include polyacrylamide polymers; vinyl alcohol polymers such as polyvinyl alcohol, ethylene-vinyl alcohol copolymers, and (meth)acrylic acid or its anhydride-vinyl alcohol copolymers; carboxyvinyl polymers; polyvinyl pyrrolidone; starches; sodium alginate; polyethylene oxide polymers; and water-soluble polyamide epoxy resins. These polymers may be used alone or in combination of two or more.

[0180] When the protective layer is formed of a resin composition containing a water-soluble polymer, the content of the water-soluble polymer in the layer is preferably 75% by mass or more, more preferably 80% by mass or more, and even more preferably 85% by mass or more.

[0181] When the protective layer is formed from a resin composition containing a water-soluble polymer, a crosslinking structure can be introduced by using a crosslinking agent to improve the density of the layer. Examples of crosslinking agents include water-soluble crosslinking agents such as glyoxylate ion-bonding crosslinking agents and epoxy crosslinking agents; hydrophobic crosslinking agents such as isocyanate crosslinking agents for imparting water resistance, polyaldehyde crosslinking agents such as glyoxal and glyoxal derivatives, and metal compound crosslinking agents such as zirconium chloride and titanium lactate.

[0182] The amount of crosslinking agent added can be appropriately determined depending on the type of crosslinking agent, etc. For example, it can be 0.1 to 100 parts by mass, preferably 1 to 50 parts by mass, and more preferably 10 to 30 parts by mass relative to 100 parts by mass of the water-soluble polymer. When the crosslinking agent content is within the above range, a dense protective layer can be formed.

[0183] The resin composition containing the water-soluble polymer is usually prepared as a solution of the water-soluble polymer dissolved in a solvent. The solvent can be selected according to the water-soluble polymer used, and typically includes water, alcohol, and a mixture of water and alcohol, with water being preferred.

[0184] The solids concentration of the water-soluble polymer-containing resin composition obtained by adding a solvent to the components constituting the protective layer, such as the water-soluble polymer and the crosslinking agent, is preferably 1 to 50% by mass, more preferably 2 to 30% by mass, and even more preferably 3 to 15% by mass. When the solids concentration of the water-soluble polymer-containing resin composition is within this range, the viscosity of the composition is low, thereby improving coating and handling properties.

[0185] In addition to the water-soluble polymer, the crosslinking agent, and a solvent such as water, the resin composition containing the water-soluble polymer may further include other components such as additives. Examples of other components include preservatives and leveling agents. When the resin composition containing the water-soluble polymer includes other components such as additives, the amount thereof is preferably 10% by mass or less, more preferably 5% by mass or less, based on the solid content of the resin composition.

[0186] A resin composition containing a water-soluble polymer, prepared by dissolving essential components such as a water-soluble polymer and a crosslinking agent in a solvent, can be applied to the surface of a substrate layer, a liquid crystal polarizer, or a light-absorbing anisotropic layer. The solvent in the coating film is dried, removed, and cured to form a protective layer.

[0187] The method of applying the resin composition containing the water-soluble polymer is not particularly limited, and examples thereof include a method of applying the composition for forming a light absorption anisotropic layer described later.

[0188] The drying temperature and time for forming a protective layer from a coating of a water-soluble polymer-containing resin composition are not particularly limited and can be appropriately determined based on the composition of the water-soluble polymer-containing resin composition used. Drying can be performed, for example, by blowing hot air, typically at a temperature within the range of 40 to 100°C, preferably 60 to 100°C. The drying time is typically 10 to 600 seconds.

[0189] Examples of the photocurable resin contained in the photocurable composition include (meth)acrylic resins, urethane resins, (meth)acrylic urethane resins, epoxy resins, and silicone resins. The photocurable resin is preferably an epoxy resin.

[0190] The photocurable composition may be a cationically curable composition containing a cationically polymerizable compound and a photocationic polymerization initiator. Examples of the cationically polymerizable compound include alicyclic epoxy compounds, aromatic epoxy compounds, and oxetane compounds having an oxetane group.

[0191] The photocurable composition may also be a curable composition such as a hard coating composition. The hard coating composition is preferably a composition comprising an ultraviolet curable resin. The composition comprising an ultraviolet curable resin preferably comprises a (meth)acrylic compound as a curable component, and the cured layer of the hard coating composition, i.e., the hard coating layer, is preferably formed from a (meth)acrylic resin. The (meth)acrylic compound is a compound having at least one (meth)acryloyl group and may be a monomer, oligomer, or polymer.

[0192] Examples of (meth)acrylic compounds include: (meth)acrylate compounds such as monofunctional (meth)acrylate compounds and multifunctional (meth)acrylate compounds; urethane (meth)acrylate compounds such as multifunctional urethane (meth)acrylate compounds; epoxy (meth)acrylate compounds such as multifunctional epoxy (meth)acrylate compounds; carboxyl-modified epoxy (meth)acrylate compounds; polyester (meth)acrylate compounds, etc. One or more of these can be used. Among them, a multifunctional (meth)acrylate compound or a urethane (meth)acrylate compound is preferred, and a combination of a multifunctional (meth)acrylate compound and a urethane (meth)acrylate is more preferred.

[0193] The content of the polyfunctional (meth)acrylate compound relative to 100 parts by mass of the solid content of the photocurable composition is preferably from 50 parts by mass to 100 parts by mass, more preferably from 60 parts by mass to 95 parts by mass, and even more preferably from 70 parts by mass to 90 parts by mass. In this specification, the solid content of the photocurable composition refers to the total amount of the components in the photocurable composition after removing the solvent when the photocurable composition contains a solvent.

[0194] The photocurable composition may contain a polymerization initiator in addition to the curable component. Examples of the polymerization initiator include photopolymerization initiators and free radical polymerization initiators, and known polymerization initiators can be used. Examples of the photopolymerization initiator include photocationic polymerization initiators.

[0195] The composition of the photocurable composition (e.g., curable components) is preferably selected so as to minimize the difference in refractive index between the protective layer obtained by curing the photocurable composition and layers adjacent to the protective layer, such as the liquid crystal polarizer and the light-absorbing anisotropic layer. The refractive index of the liquid crystal polarizer and the light-absorbing anisotropic layer is, for example, 1.5 to 1.7. Therefore, the refractive index of the first protective layer adjacent to both of these layers is preferably selected so as to be within ±0.05 of the refractive index of the liquid crystal polarizer and the light-absorbing anisotropic layer.

[0196] The photocurable composition can be applied to the surface of a substrate layer, a liquid crystal polarizer, or a light-absorbing anisotropic layer, and then irradiated with active energy rays such as ultraviolet rays to polymerize curable components such as (meth)acrylic compounds and cure.

[0197] The cured layer of the hard coating composition, i.e., the hard coating layer, preferably shows a value of 8B or harder in the pencil hardness test (measured by placing the film substrate on a glass plate) specified in JIS K 5600-5-4:1999 "General test methods for coatings - Part 5: Mechanical properties of coating films - Section 4: Scratch hardness (pencil method)", and may also show a value of 5B or harder.

[0198] The photocurable composition can be applied to the surface of a substrate layer, a liquid crystal polarizer, or a light-absorbing anisotropic layer, and cured by irradiation with active energy rays to form a protective layer. The surface of the substrate layer, liquid crystal polarizer, or light-absorbing anisotropic layer on the side where the protective layer is to be formed can be subjected to a surface treatment. Examples of surface treatment methods include corona treatment or plasma treatment of the surface under an atmosphere ranging from vacuum to atmospheric pressure, laser treatment, ozone treatment, and flame treatment.

[0199] The thickness of the protective layer is preferably 0.05 μm to 15 μm, and may be 0.1 μm to 12 μm, preferably 0.5 μm to 10 μm, and more preferably 1 μm to 5 μm.

[0200] (Light Absorption Anisotropic Layer)

[0201] The light-absorbing anisotropic layer comprises a polymer of a polymerizable liquid crystal compound and a dichroic dye. The light-absorbing anisotropic layer may comprise a single polymer of a polymerizable liquid crystal compound or may comprise polymers of two or more polymerizable liquid crystal compounds. The light-absorbing anisotropic layer may comprise a single dichroic dye or may comprise two or more dichroic dyes.

[0202] The light-absorbing anisotropic layer can be formed using a composition for forming a light-absorbing anisotropic layer containing a polymerizable liquid crystal compound and a dichroic dye. The composition for forming a light-absorbing anisotropic layer may contain, as solid components, a non-liquid crystal compound having a polymerizable group, as well as additives such as a polymerization initiator, a leveling agent, an alignment promoter, a reactive additive, an antioxidant, and a photosensitizer, in addition to the polymerizable liquid crystal compound and the dichroic dye, as described below. Therefore, the light-absorbing anisotropic layer may also contain a polymer of a non-liquid crystal compound having a polymerizable group and additives.

[0203] The polymerizable liquid crystal compound is preferably a liquid crystal compound that forms a smectic phase. The polymer of the polymerizable liquid crystal compound may or may not show liquid crystal properties. The light absorption anisotropic layer may be formed by a light absorption anisotropic layer-forming composition comprising a polymerizable liquid crystal compound and a dichroic pigment, or may be a liquid crystal cured film (a cured product layer of a polymerizable liquid crystal compound) obtained by polymerizing and curing the polymerizable liquid crystal compound in the light absorption anisotropic layer-forming composition. The polymer of the polymerizable liquid crystal compound is a substance obtained by polymerizing the polymerizable liquid crystal compounds with each other, but the polymerizable liquid crystal compound may also be polymerized with a non-liquid crystal compound having a polymerizable group, or the polymerizable liquid crystal compound may be polymerized with a dichroic pigment.

[0204] Relative to 100 parts by mass of the light absorption anisotropic layer, the content of the polymer of the polymerizable liquid crystal compound in the light absorption anisotropic layer is preferably 40 parts by mass or more and 99.9 parts by mass or less, or 60 parts by mass or more and 99 parts by mass or less, or 70 parts by mass or more and 99 parts by mass or less. If the content of the polymer of the polymerizable liquid crystal compound is within the above range, there is a tendency for the orientation of the polymer of the polymerizable liquid crystal compound when forming the light absorption anisotropic layer to become higher. The proportion of the polymer of the polymerizable liquid crystal compound in the light absorption anisotropic layer can be calculated as a ratio of 100 parts by mass of the solid content of the composition for forming the light absorption anisotropic layer to the solid content of the composition for forming the light absorption anisotropic layer. The so-called solid content of the composition for forming the light absorption anisotropic layer refers to all the components after removing volatile components such as organic solvents from the composition for forming the light absorption anisotropic layer.

[0205] The content of the dichroic pigment in the light-absorbing anisotropic layer is preferably from 0.1 to 30 parts by mass, relative to 100 parts by mass of the light-absorbing anisotropic layer, and may be from 0.5 to 20 parts by mass, from 1 to 10 parts by mass, or from 1 to 5 parts by mass. The proportion of the dichroic pigment in the light-absorbing anisotropic layer can be calculated as the ratio of the dichroic pigment to 100 parts by mass of the solid content of the composition for forming the light-absorbing anisotropic layer. When the light-absorbing anisotropic layer contains two or more dichroic pigments, the content of the dichroic pigment refers to the total amount thereof.

[0206] The thickness of the light absorption anisotropic layer is preferably from 0.2 μm to 5.0 μm, more preferably from 0.5 μm to 4.0 μm, and even more preferably from 0.5 μm to 3.0 μm. If the thickness of the light absorption anisotropic layer is reduced, light absorption from oblique directions tends to be weakened. If the thickness is increased, the orientation of the dichroic dye tends to be disturbed, thereby tending to reduce the transmission characteristics in the front direction.

[0207] When the optical layered body has a third protective layer, the surface of the light-absorbing anisotropic layer opposite to the first protective layer may be subjected to a surface treatment. Examples of surface treatment methods include corona treatment or plasma treatment of the surface of the light-absorbing anisotropic layer in an atmosphere ranging from vacuum to atmospheric pressure, laser treatment, ozone treatment, and flame treatment.

[0208] (Polymerizable liquid crystal compound)

[0209] The polymerizable liquid crystal compound contained in the composition for forming the light-absorbing anisotropic layer is used to align the dichroic dye through guest-host interaction. The polymerizable liquid crystal compound is a compound having one or more polymerizable groups in the molecule and having liquid crystallinity.

[0210] The polymerizable group refers to a group that participates in the polymerization reaction, and is preferably a photopolymerizable group. Here, the so-called photopolymerizable group refers to a group that can utilize the active free radicals, acids, etc. produced by the photopolymerization initiator described later to participate in the polymerization reaction. As the polymerizable group, vinyl, vinyloxy, 1-chlorovinyl, isopropenyl, 4-vinylphenyl, (meth) acryloyl, (meth) acryloyloxy, oxirane, oxetanyl, etc. can be mentioned. Among them, preferably (meth) acryloyl, (meth) acryloyloxy, vinyloxy, oxirane and oxetanyl, more preferably (meth) acryloyl and (meth) acryloyloxy. Liquid crystal can be a thermotropic liquid crystal or a lyotropic liquid crystal. When mixed with the above-mentioned dichroic pigment, it is preferably a thermotropic liquid crystal.

[0211] When a polymer of a polymerizable liquid crystal compound is formed by polymerization reaction, and light absorption anisotropy is exhibited as a film comprising the polymer and a dichroic pigment, the liquid crystal state shown by the polymerizable liquid crystal compound is a smectic phase, and from the viewpoint of high performance of optical properties, it is preferably a high-order smectic phase. Among them, it is more preferably a high-order smectic polymerizable liquid crystal compound forming a smectic B phase, a smectic D phase, a smectic E phase, a smectic F phase, a smectic G phase, a smectic H phase, a smectic I phase, a smectic J phase, a smectic K phase or a smectic L phase, and further preferably a high-order smectic polymerizable liquid crystal compound forming a smectic B phase, a smectic F phase or a smectic I phase. If the liquid crystal phase formed by the polymerizable liquid crystal compound is these high-order smectic phases, it is possible to manufacture a light absorption anisotropic layer having a higher light absorption anisotropy. The light absorption anisotropic layer having such a high light absorption anisotropy can obtain a Bragg peak from a high-order structure such as a hexagonal phase and a crystalline phase in an X-ray diffraction measurement. The Bragg peak is a peak derived from a periodic structure of molecular orientation. For a light-absorbing anisotropic layer, its periodic interval can be From the viewpoint of obtaining higher light absorption anisotropic properties, the light absorption anisotropic layer preferably contains a polymer of a polymerizable liquid crystal compound aligned in a smectic phase.

[0212] The polymerizable liquid crystal compound can be a monomer, an oligomer obtained by polymerization of a polymerizable group, or a polymer. As such a polymerizable liquid crystal compound, a known polymerizable liquid crystal compound can be used, for example, the polymerizable liquid crystal compounds described in Japanese Patent Laid-Open No. 2020-76920 and Japanese Patent No. 6728581 can be cited.

[0213] (Dichroic Pigments)

[0214] A dichroic dye is a dye that has a different absorbance along the long axis of the molecule than along its short axis. Dichroic dyes preferably absorb visible light, and more preferably have a maximum absorption wavelength (λmax) within the range of 380 to 680 nm.

[0215] As such dichroic pigment, for example, can enumerate acridine pigment, oxazine pigment, cyanine pigment, naphthalene pigment, azo pigment and anthraquinone pigment etc., wherein, be preferably azo pigment.As azo pigment, can enumerate monoazo pigment, disazo pigment, triazo pigment, tetraazo pigment and stilbene azo pigment etc., be preferably disazo pigment and triazo pigment.Dichroic pigment can also combine 2 or more separately, but preferably uses in combination 2 or more according to the wavelength range of light absorption anisotropy that requires in the light absorption anisotropic layer.

[0216] Examples of the azo dye include compounds represented by formula (I) (hereinafter also referred to as “compound (I)”).

[0217] K 1 (-N=NK 2 ) p -N=NK 3 (I)

[0218] [In formula (I),

[0219] K 1 and K 3 Each independently represents a phenyl group which may have a substituent, a naphthyl group which may have a substituent, or a monovalent heterocyclic group which may have a substituent.

[0220] K 2 It represents a p-phenylene group which may have a substituent, a naphthalene-1,4-diyl group which may have a substituent, or a divalent heterocyclic group which may have a substituent.

[0221] p represents an integer of 1 to 4.

[0222] When p is an integer greater than 2, multiple K 2 They can be the same or different from each other.

[0223] In the range that shows absorption in the visible light region, the -N=N- bond can be replaced by a -C=C-, -COO-, -NHCO-, or -N=CH- bond.]

[0224] Examples of the monovalent heterocyclic group include groups obtained by removing one hydrogen atom from a heterocyclic compound such as quinoline, thiazole, benzothiazole, thienothiazole, imidazole, benzimidazole, oxazole, and benzoxazole. Examples of the divalent heterocyclic group include groups obtained by removing two hydrogen atoms from the above heterocyclic compounds.

[0225] As K 1 and K 3 The phenyl, naphthyl and monovalent heterocyclic groups, and K 2 The substituents that the p-phenylene, naphthalene-1,4-diyl and divalent heterocyclic group may optionally have include an alkyl group having 1 to 4 carbon atoms; an alkoxy group having 1 to 4 carbon atoms such as a methoxy group, an ethoxy group, a butoxy group, etc.; a fluoroalkyl group having 1 to 4 carbon atoms such as a trifluoromethyl group; a cyano group; a nitro group; a halogen atom; a substituted or unsubstituted amino group such as an amino group, a diethylamino group, a pyrrolidinyl group, etc. (the so-called substituted amino group refers to an amino group having 1 or 2 alkyl groups having 1 to 6 carbon atoms, or an amino group in which two substituted alkyl groups are bonded to each other to form an alkanediyl group having 2 to 8 carbon atoms. The unsubstituted amino group is -NH2.).

[0226] Among the compounds (I), the compounds represented by any one of formula (I-1) to formula (I-8) are preferred, the compounds represented by any one of formula (I-1) to formula (I-3) are more preferred, and the compounds represented by any one of formula (I-1) and formula (I-3) are even more preferred.

[0227] [Chemical Formula 1]

[0228]

[0229] [In formulas (I-1) to (I-8),

[0230] B 1 ~B 30 Each independently represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a cyano group, a nitro group, a substituted or unsubstituted amino group (the definitions of the substituted amino group and the unsubstituted amino group are as described above), a chlorine atom or a trifluoromethyl group.

[0231] n1 to n4 independently represent integers of 0 to 3.

[0232] When n1 is 2 or more, multiple B 2 They can be the same or different from each other.

[0233] When n2 is greater than 2, multiple B 6 They can be the same or different from each other.

[0234] When n3 is 2 or more, multiple B 9 They can be the same or different from each other.

[0235] When n4 is 2 or more, multiple B 14 They may be the same or different from each other.]

[0236] As the anthraquinone dye, a compound represented by formula (I-9) is preferred.

[0237] [Chemical Formula 2]

[0238]

[0239] [In formula (I-9),

[0240] R 1 ~R 8 independently represent a hydrogen atom, -R x 、-NH2、-NHR x 、-NR x 2. -SR x or halogen atoms.

[0241] R xrepresents an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 12 carbon atoms.]

[0242] As the oxazinone dye, a compound represented by formula (I-10) is preferred.

[0243] [Chemical Formula 3]

[0244]

[0245] [In formula (I-10),

[0246] R 9 ~R 15 independently represent a hydrogen atom, -R x 、-NH2、-NHR x 、-NR x 2. -SR x or halogen atoms.

[0247] R x represents an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 12 carbon atoms.]

[0248] As the acridine dye, a compound represented by formula (I-11) is preferable.

[0249] [Chemical Formula 4]

[0250]

[0251] [In formula (I-11),

[0252] R 16 ~R 23 independently represent a hydrogen atom, -R x 、-NH2、-NHR x 、-NR x 2. -SR x or halogen atoms.

[0253] R x represents an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 12 carbon atoms.]

[0254] In formula (I-9), formula (I-10) and formula (I-11), R x Examples of the alkyl group having 1 to 6 carbon atoms include methyl, ethyl, propyl, butyl, pentyl and hexyl, and examples of the aryl group having 6 to 12 carbon atoms include phenyl, tolyl, xylyl and naphthyl.

[0255] As the cyanine dye, a compound represented by formula (I-12) and a compound represented by formula (I-13) are preferred.

[0256] [Chemical Formula 5]

[0257]

[0258] [In formula (I-12),

[0259] D 1 and D 2 Each independently represents a group represented by any one of formula (I-12a) to formula (I-12d).

[0260] [Chemical Formula 6]

[0261]

[0262] n5 represents an integer from 1 to 3.]

[0263] [Chemical Formula 7]

[0264]

[0265] [In formula (I-13),

[0266] D 3 and D 4 Each independently represents a group represented by any one of formula (I-13a) to formula (I-13h).

[0267] [Chemical Formula 8]

[0268]

[0269] n6 represents an integer from 1 to 3.]

[0270] Among these dichroic dyes, azo dyes are preferred from the viewpoint of orientation.

[0271] Regarding the content of the dichroic dye in the light absorption anisotropic layer-forming composition (the total amount when containing two or more), from the perspective of obtaining good light absorption properties, it is generally 1 mass part to 60 mass parts, preferably 1 mass part to 40 mass parts, and more preferably 1 mass part to 20 mass parts, relative to 100 mass parts of the polymerizable liquid crystal compound. When the content of the dichroic dye is less than this range, light absorption becomes insufficient and sufficient light absorption anisotropic properties cannot be obtained. When it is more than this range, there is a situation where the orientation of the liquid crystal molecules of the polymerizable liquid crystal compound is hindered.

[0272] (Method for Forming Light Absorption Anisotropic Layer)

[0273] The light-absorbing anisotropic layer can be formed, for example, by coating a light-absorbing anisotropic layer-forming composition onto the first protective layer formed on the liquid crystal polarizer. The light-absorbing anisotropic layer-forming composition comprises a polymerizable liquid crystal compound and a dichroic dye, and may also contain a non-liquid crystal compound having a polymerizable group, a solvent, and additives, as described below.

[0274] The coating layer formed by applying the composition for forming an anisotropic light-absorbing layer is subjected to a drying treatment to remove the solvent, etc. The dried coating layer can be irradiated with active energy rays, etc., to polymerize the polymerizable liquid crystal compound, thereby forming a light-absorbing anisotropic layer on the first protective layer as a cured layer (liquid crystal cured film) of the composition for forming anisotropic light-absorbing layer. The composition for forming anisotropic light-absorbing layer can be applied to the surface of the first protective layer or to the surface of a homeotropic alignment layer formed on the surface of the first protective layer.

[0275] Examples of a method for applying the light-absorbing anisotropic layer-forming composition include known methods such as spin coating, extrusion, gravure coating, die coating, bar coating, and applicator coating, and printing methods such as flexographic printing.

[0276] The coating layer of the light-absorbing anisotropic layer-forming composition formed on the first protective layer is preferably dried. If the light-absorbing anisotropic layer-forming composition contains a solvent, the solvent can be removed by drying the coating layer. Examples of drying methods include known methods, including one or more methods such as natural drying, heat drying, ventilation drying, and reduced-pressure drying.

[0277] The drying conditions during the drying process can be appropriately determined depending on the components contained in the composition for forming the light-absorbing anisotropic layer. For example, the drying temperature during the drying process can be from 50°C to 150°C, or from 60°C to 120°C. The drying time during the drying process can be from 15 seconds to 10 minutes, or from 0.5 minutes to 5 minutes.

[0278] When heat treatment is performed during the drying process, the composition for forming the light-absorbing anisotropic layer can be heated to a temperature above the liquid crystal phase transition temperature at which the polymerizable liquid crystal compound contained in the composition undergoes a phase transition. This allows the polymerizable liquid crystal compound to be oriented while removing the solvent from the coating layer. In particular, when aligning the polymerizable liquid crystal compound forming a smectic phase perpendicular to the surface of the light-absorbing anisotropic layer, heating is preferably performed within a temperature range where the polymerizable liquid crystal compound transitions to the smectic phase. This allows the polymerizable liquid crystal compound to be oriented perpendicular to the surface of the light-absorbing anisotropic layer, and the dichroic pigment can also be oriented along with the orientation of the polymerizable liquid crystal compound.

[0279] After drying the coating layer formed on the first protective layer, the polymerizable liquid crystal compound and the dichroic dye are aligned and then irradiated with active energy rays to polymerize and cure the polymerizable liquid crystal compound, thereby forming a light absorption anisotropic layer.

[0280] As a method for polymerizing a polymerizable liquid crystal compound, photopolymerization is preferred. Photopolymerization can be implemented by irradiating an active energy ray to a laminated structure comprising a coating layer obtained by coating a light-absorbing anisotropic layer-forming composition on a first protective layer. As the active energy ray irradiated, it can be appropriately selected according to the type of polymerizable liquid crystal compound contained in the coating layer (especially the type of photopolymerizable functional group possessed by the polymerizable liquid crystal compound), the type of photopolymerization initiator when a photopolymerization initiator is included, and their amount. Specifically, one or more lights selected from the group consisting of visible light, ultraviolet light, infrared light, X-rays, α-rays, β-rays and γ-rays can be cited. Among them, from the perspective of easily controlling the progress of the polymerization reaction and being able to use a device that is widely used in this field as a photopolymerization device, ultraviolet light is preferred, and the type of polymerizable liquid crystal compound is preferably selected in a manner that can utilize ultraviolet light for photopolymerization.

[0281] Examples of light sources for active energy rays include low-pressure mercury lamps, medium-pressure mercury lamps, high-pressure mercury lamps, ultra-high-pressure mercury lamps, xenon lamps, halogen lamps, carbon arc lamps, tungsten lamps, gallium lamps, excimer lasers, LED light sources emitting light in a wavelength range of 380 to 440 nm, chemical lamps, black light lamps, microwave-excited mercury lamps, and metal halide lamps.

[0282] The UV radiation intensity is usually 10mW / cm 2 ~3,000mW / cm 2 The intensity of ultraviolet irradiation is preferably an intensity in a wavelength region effective for activating a cationic polymerization initiator or a free radical polymerization initiator. The irradiation time is usually 0.1 seconds to 10 minutes, preferably 1 second to 5 minutes, more preferably 5 seconds to 3 minutes, and even more preferably 10 seconds to 1 minute. When irradiation is performed once or multiple times with such an ultraviolet irradiation intensity, the cumulative light amount is 10 mJ / cm 2 ~3,000mJ / cm 2 , preferably 50 mJ / cm 2 ~2,000mJ / cm 2 , more preferably 100 mJ / cm 2 ~1,000mJ / cm 2 When the accumulated light intensity is below this range, the curing of the polymerizable liquid crystal compound may become insufficient. On the other hand, when the accumulated light intensity is above this range, the light absorption anisotropic layer may be colored.

[0283] (Non-liquid crystal compound having a polymerizable group)

[0284] The non-liquid crystal compound with a polymerizable group (hereinafter also referred to as "non-liquid crystal compound") is a compound having a polymerizable group and not having liquid crystal. As the polymerizable group possessed by the non-liquid crystal compound, vinyl, vinyloxy, 1-chlorovinyl, isopropenyl, 4-vinylphenyl, (methyl) acryloyl, (methyl) acryloyloxy, oxirane, oxetane, etc. can be mentioned. Among them, preferred polymerizable groups are (methyl) acryloyl, (methyl) acryloyloxy, vinyloxy, oxirane and oxetane, more preferred polymerizable groups are (methyl) acryloyl and (methyl) acryloyloxy, and further preferred polymerizable groups are (methyl) acryloyloxy. The polymerizable group in the non-liquid crystal compound can be one kind or a combination of two or more kinds, but is preferably a polymerizable group identical to the polymerizable group possessed by the polymerizable liquid crystal compound.

[0285] The number of polymerizable groups possessed by the non-liquid crystalline compound is not particularly limited and may be, for example, 1 to 20. However, from the perspective of further improving the film strength of the light absorption anisotropic layer, the number is preferably 2 to 10, and more preferably 3 to 6. When the non-liquid crystalline compound has two or more polymerizable groups, the polymerizable groups may be the same or different.

[0286] Examples of non-liquid crystal compounds include monofunctional (meth)acrylates and polyfunctional (meth)acrylates. Monofunctional acrylates and polyfunctional acrylates, which are non-liquid crystal compounds having polymerizable groups, are non-liquid crystal and, therefore, are preferably compounds that do not have a mesogenic structure. Monofunctional acrylates and polyfunctional acrylates may contain a urethane structure, an amino structure, an epoxy structure, an ethylene glycol structure, and / or a polyester structure in the molecule.

[0287] (Solvent)

[0288] The solvent that may be contained in the composition for forming a light-absorbing anisotropic layer is preferably a solvent that can completely dissolve the polymerizable liquid crystal compound and is preferably a solvent that is inactive with respect to the polymerization reaction of the polymerizable liquid crystal compound. Examples of the solvent include alcohol solvents such as methanol, ethanol, ethylene glycol, isopropanol, propylene glycol, ethylene glycol methyl ether, ethylene glycol butyl ether, and propylene glycol monomethyl ether; ester solvents such as ethyl acetate, butyl acetate, ethylene glycol methyl ether acetate, γ-butyrolactone, propylene glycol methyl ether acetate, and ethyl lactate; ketone solvents such as acetone, methyl ethyl ketone, cyclopentanone, cyclohexanone, 2-heptanone, and methyl isobutyl ketone; aliphatic hydrocarbon solvents such as pentane, hexane, and heptane; aromatic hydrocarbon solvents such as toluene and xylene; nitrile solvents such as acetonitrile; ether solvents such as tetrahydrofuran and dimethoxyethane; chlorinated solvents such as chloroform and chlorobenzene; amide solvents such as dimethylacetamide, dimethylformamide, N-methyl-2-pyrrolidone, and 1,3-dimethyl-2-imidazolidinone. These solvents may be used alone or in combination of two or more.

[0289] The solvent content in the composition for forming an anisotropic light-absorbing layer is preferably 50 to 98% by mass relative to the total amount of the composition. In other words, the solid content in the composition for forming an anisotropic light-absorbing layer is preferably 2 to 50% by mass, and more preferably 5 to 30% by mass. If the solid content is 50% or less by mass, the viscosity of the composition for forming an anisotropic light-absorbing layer is reduced, making it easier to form an anisotropic light-absorbing layer with a substantially uniform thickness, and there is a tendency to reduce the occurrence of unevenness in the anisotropic light-absorbing layer. The solid content can be determined based on the thickness of the anisotropic light-absorbing layer to be produced.

[0290] (additive)

[0291] The composition for forming a light-absorbing anisotropic layer may contain additives such as a polymerization initiator such as a photopolymerization initiator or a thermal polymerization initiator, a leveling agent, an alignment promoter, a reactive additive, an antioxidant, and a photosensitizer.

[0292] (Polymerization initiator)

[0293] The composition for forming a light-absorbing anisotropic layer may contain a polymerization initiator. A polymerization initiator can be used when the composition for forming a light-absorbing anisotropic layer contains a compound that participates in a polymerization reaction, such as a polymerizable liquid crystal compound, and is a compound capable of initiating the polymerization reaction of the compound. As a polymerization initiator that initiates the polymerization reaction of the polymerizable liquid crystal compound, a photopolymerization initiator that generates active free radicals under the action of light is preferred, as it is independent of the phase state of the thermotropic liquid crystal.

[0294] The photopolymerization initiator may be any compound capable of initiating a polymerization reaction of a polymerizable liquid crystal compound or the like, and known photopolymerization initiators may be used. Specifically, photopolymerization initiators capable of generating active free radicals or acids by the action of light are exemplified, with photopolymerization initiators that generate free radicals by the action of light being preferred. The photopolymerization initiators may be used alone or in combination of two or more.

[0295] The photopolymerization initiator can use a known photopolymerization initiator. For example, as a photopolymerization initiator that generates active free radicals, the following can be used:

[0296] Self-cleavable benzoin-based compounds, acetophenone-based compounds, hydroxyacetophenone-based compounds, α-aminoacetophenone-based compounds, oxime ester-based compounds, acylphosphine oxide-based compounds, azo-based compounds, etc.; and

[0297] Hydrogen-abstracting benzophenone compounds, alkyl phenone compounds, benzoin ether compounds, benzyl ketal compounds, dibenzosuberone compounds, anthraquinone compounds, xanthone compounds, thioxanthone compounds, halogenated acetophenone compounds, dialkoxyacetophenone compounds, halogenated bisimidazole compounds, halogenated triazine compounds, triazine compounds, etc.

[0298] As the photopolymerization initiator that generates an acid, iodonium salts, sulfonium salts, and the like can be used.

[0299] From the viewpoint of excellent reaction efficiency at low temperatures, the photopolymerization initiator is preferably a self-cleaving type photopolymerization initiator, and particularly preferably an acetophenone compound, a hydroxyacetophenone compound, an α-aminoacetophenone compound, or an oxime ester compound.

[0300] The content of the polymerization initiator in the composition for forming a light-absorbing anisotropic layer can be appropriately adjusted depending on the type and amount of the polymerizable liquid crystal compound. It is generally 0.1 to 30 parts by mass, preferably 0.5 to 10 parts by mass, and more preferably 0.5 to 8 parts by mass, relative to 100 parts by mass of the polymerizable liquid crystal compound. When the content of the polymerization initiator is within this range, polymerization can be performed without disturbing the alignment of the polymerizable liquid crystal compound.

[0301] (Leveling agent)

[0302] The composition for forming an anisotropic light-absorbing layer may include a leveling agent. A leveling agent is an additive that adjusts the fluidity of the composition for forming an anisotropic light-absorbing layer and makes the film obtained by applying the composition for forming an anisotropic light-absorbing layer flatter. The composition for forming an anisotropic light-absorbing layer may include a silicone leveling agent, a polyacrylate leveling agent, a perfluoroalkyl leveling agent, or other fluorine-based leveling agent, preferably a silicone leveling agent. By including a silicone leveling agent in the composition for forming an anisotropic light-absorbing layer, adhesion of the anisotropic light-absorbing layer can be easily suppressed. When the composition for forming an anisotropic light-absorbing layer includes a silicone leveling agent, its content can be, for example, within the range described below as the content in the anisotropic light-absorbing layer.

[0303] Silicone leveling agents are leveling agents containing silicon atoms, and preferably use leveling agents having a polyorganosiloxane skeleton. As groups bonded to the silicon atoms in the polyorganosiloxane (silicon atoms forming siloxane bonds), hydrocarbon groups and the like can be cited. Among them, preferably, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an ester group having 1 to 10 carbon atoms, and an aryl group are preferred, more preferably a methyl group and a phenyl group, and even more preferably a methyl group. The group bonded to the above-mentioned silicon atom may be only one type or may be two or more types. The number of repetitions (polymerization degree) of the siloxane unit is not particularly limited, but is preferably 2 to 10,000, more preferably 3 to 5,000, and even more preferably 5 to 1,000.

[0304] Commercially available silicone leveling agents can be used. Examples of commercially available silicone leveling agents include BYK-300, BYK-302, BYK-306, BYK-307, BYK-310, BYK-313, BYK-315N, BYK-320, BYK-322, BYK-323, BYK-325, BYK-330, BYK-331, BYK-333, BYK-337, BYK-342, BYK-345, BYK-346, BYK-347, BYK-348, BYK-349, BYK-370, BYK-377, BYK-378, BYK-3455, and BYK-UV3510 (all BYK Chemicals). Japan K.K.), KF-945, KF-6015, KF-6020 (all manufactured by Shin-Etsu Chemical Co., Ltd.), TEGORad2300, TEGORad2200N, TEGORad2011 (manufactured by Degussa Co., Ltd.); as silicone leveling agents having a radical polymerizable group such as a (meth)acryloyl group added to a polyether chain, BYK-UV3500, BYK-UV3505, BYK-3510, BYK-UV3530, BYK-UV3570, BYK-UV3575, BYK-UV3576 (all manufactured by BYK Chemie Japan KP-420, KP-983 (all manufactured by Shin-Etsu Chemical Co., Ltd.), etc.

[0305] Relative to 100 parts by mass of the polymer of the polymerizable liquid crystal compound contained in the light absorbing anisotropic layer, the silicon-based leveling agent is preferably 0.01 parts by mass or more and 5.0 parts by mass or less, more preferably 0.05 parts by mass or more and 3.0 parts by mass or less, further preferably 0.05 parts by mass or more and 2.0 parts by mass or less, further preferably 0.1 parts by mass or more and 1.0 parts by mass or less, particularly preferably 0.1 parts by mass or more and 0.5 parts by mass or less. The content of the polymer of the polymerizable liquid crystal compound and the content of the silicon-based leveling agent can be calculated as the content of the polymerizable liquid crystal compound and the silicon-based leveling agent in the composition for forming the light absorbing anisotropic layer. By making the content of the silicon-based leveling agent within the above range, it is easy to form a light absorbing anisotropic layer flat and to suppress adhesion. By making the content of the silicon-based leveling agent less than 5.0 parts by mass, it is easy to suppress depression when applying the composition for forming the light absorbing anisotropic layer on the first protective layer.

[0306] (Orientation Promoter)

[0307] When the composition for forming a light-absorbing anisotropic layer is directly applied to the surface of the first protective layer (when a vertical alignment layer is not used), the composition for forming a light-absorbing anisotropic layer preferably contains an orientation promoter. An orientation promoter refers to a material that promotes the liquid crystal orientation of a polymerizable liquid crystal compound along a desired direction. As an orientation promoter that promotes the orientation of a polymerizable liquid crystal compound along a vertical direction, ionic compounds and nonionic silane compounds formed from non-metallic atoms can be cited. The composition for forming a light-absorbing anisotropic layer preferably contains at least one of an ionic compound and a nonionic silane compound formed from non-metallic atoms, and more preferably contains both an ionic compound and a nonionic silane compound formed from non-metallic atoms.

[0308] As the silane compound, a nonionic silane compound described later, an ionic compound containing silane, etc. can be used. By using these silane compounds, the vertical alignment control force can be improved. These silane compounds can be used alone or in combination of two or more, or mixed with other materials. When the silane compound is a nonionic silane compound, from the perspective of easily improving the vertical alignment control force, a silane compound having an alkyl group at the molecular end is preferred, and a silane compound having an alkyl group with 3 to 30 carbon atoms is more preferred.

[0309] When the composition for forming an anisotropic light-absorbing layer contains an ionic compound formed from non-metallic atoms, the dried film of the composition for forming anisotropic light-absorbing layer formed on the first protective layer exhibits a homeotropic alignment control force on the polymerizable liquid crystal compound due to electrostatic interaction, and the polymerizable liquid crystal compound tends to align in a direction perpendicular to the surface of the first protective layer within the dried film. This allows the polymerizable liquid crystal compound to be maintained in a homeotropically aligned state, thereby forming a light-absorbing anisotropic layer as a liquid crystal cured film.

[0310] As the ionic compound formed from non-metallic atoms, for example, onium salts (more specifically, nitrogen atoms have quaternary ammonium salts, tertiary sulfonium salts, and phosphorus atoms have quaternary phosphonium salts etc. that are positively charged). Among these onium salts, from the viewpoint of further improving the vertical orientation of polymerizable liquid crystal compounds, preferred quaternary onium salts, from the viewpoint of improving availability and mass production, more preferably quaternary phosphonium salts or quaternary ammonium salts. Onium salts can have more than two quaternary onium salt positions in the molecule, or can be oligomers, polymers.

[0311] The molecular weight of the ionic compound is preferably from 100 to 10,000. Within this range, the homeotropic alignment of the polymerizable liquid crystal compound can be easily enhanced while ensuring the coatability of the composition for forming a light-absorbing anisotropic layer. The molecular weight of the ionic compound is more preferably 5,000 or less, and even more preferably 3,000 or less.

[0312] Examples of the cationic component of the ionic compound include inorganic cations and organic cations. Among these, organic cations are preferred from the perspective of being less likely to produce alignment defects in the polymerizable liquid crystal compound. Examples of the organic cation include imidazolium cations, pyridinium cations, ammonium cations, sulfonium cations, and phosphonium cations.

[0313] Ionic compounds generally have counter anions. As the anionic component that becomes the counter ion of the above-mentioned cationic component, for example, inorganic anions and organic anions can be mentioned. Among them, from the aspect of not being easy to produce the orientation defect of polymerizable liquid crystal compound, organic anions are preferred. It should be noted that cations and anions do not necessarily correspond one to one.

[0314] Specific examples of the anion component include the following.

[0315] Chloride anion 〔Cl - 〕,

[0316] Bromide anion 〔Br - 〕,

[0317] Iodide anion - 〕,

[0318] Tetrachloroaluminate anion 〔AlCl4 - 〕,

[0319] Heptachlorodialuminate anion〔Al2Cl7 - 〕,

[0320] Tetrafluoroborate anion 〔BF4 - 〕,

[0321] Hexafluorophosphate anion 〔PF6 - 〕,

[0322] Perchlorate anion 〔ClO4 - 〕,

[0323] Nitrate anion〔NO3 - 〕,

[0324] Acetate anion 〔CH3COO - 〕,

[0325] trifluoroacetate anion [CF3COO - 〕,

[0326] Fluorosulfonate anion 〔FSO3 - 〕,

[0327] Methanesulfonate anion 〔CH3SO3 - 〕,

[0328] trifluoromethanesulfonate anion 〔CF3SO3 - 〕,

[0329] p-Toluenesulfonate anion〔p-CH3C6H4SO3 - 〕,

[0330] Bis(fluorosulfonyl)imide anion〔(FSO2)2N - 〕,

[0331] Bis(trifluoromethanesulfonyl)imide anion〔(CF3SO2)2N - 〕,

[0332] tris(trifluoromethanesulfonyl)methane anion〔(CF3SO2)3C - 〕,

[0333] Hexafluoroarsenate anion 〔AsF6 - 〕,

[0334] Hexafluoroantimonate anion〔SbF6 - 〕,

[0335] Hexafluoroniobate anion〔NbF6 - 〕,

[0336] Hexafluorotantalate anion [TaF6 - 〕,

[0337] Dimethylphosphinate anion〔(CH3)2POO - 〕,

[0338] (Poly)hydrofluorofluoride anion〔F(HF) n- 〕(for example, n represents an integer from 1 to 3),

[0339] Dicyanamide anion〔(CN)2N - 〕,

[0340] Thiocyanate anion (SCN - 〕,

[0341] Perfluorobutanesulfonate anion 〔C4F9SO3 - 〕,

[0342] Bis(pentafluoroethanesulfonyl)imide anion〔(C2F5SO2)2N - 〕,

[0343] Perfluorobutyrate anion 〔C3F7COO-〕, and

[0344] (Trifluoromethanesulfonyl)(trifluoromethylcarbonyl)imide anion〔(CF3SO2)(CF3CO)N - 〕.

[0345] Specific examples of the ionic compound can be appropriately selected from the above-mentioned combinations of cationic components and anionic components. Specific examples of the compound of the combination of a cationic component and anionic component include the following compounds.

[0346] (Pyridinium salt)

[0347] N-hexylpyridinium hexafluorophosphate,

[0348] N-octylpyridinium hexafluorophosphate,

[0349] N-methyl-4-hexylpyridinium hexafluorophosphate,

[0350] N-butyl-4-methylpyridinium hexafluorophosphate,

[0351] N-octyl-4-methylpyridinium hexafluorophosphate,

[0352] N-hexylpyridinium bis(fluorosulfonyl)imide,

[0353] N-octylpyridinium bis(fluorosulfonyl)imide,

[0354] N-methyl-4-hexylpyridinium bis(fluorosulfonyl)imide,

[0355] N-butyl-4-methylpyridinium bis(fluorosulfonyl)imide,

[0356] N-octyl-4-methylpyridinium bis(fluorosulfonyl)imide,

[0357] N-hexylpyridinium bis(trifluoromethanesulfonyl)imide,

[0358] N-octylpyridinium bis(trifluoromethanesulfonyl)imide,

[0359] N-methyl-4-hexylpyridinium bis(trifluoromethanesulfonyl)imide,

[0360] N-butyl-4-methylpyridinium bis(trifluoromethanesulfonyl)imide,

[0361] N-octyl-4-methylpyridinium bis(trifluoromethanesulfonyl)imide,

[0362] N-hexylpyridinium p-toluenesulfonate,

[0363] N-octylpyridinium p-toluenesulfonate,

[0364] N-methyl-4-hexylpyridinium p-toluenesulfonate,

[0365] N-butyl-4-methylpyridinium p-toluenesulfonate, and

[0366] N-octyl-4-methylpyridinium p-toluenesulfonate.

[0367] (Imidazolium salt)

[0368] 1-ethyl-3-methylimidazolium hexafluorophosphate,

[0369] 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide,

[0370] 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide,

[0371] 1-ethyl-3-methylimidazolium p-toluenesulfonate,

[0372] 1-Butyl-3-methylimidazolium methanesulfonate, etc.

[0373] (Pyrrolidinium salt)

[0374] N-butyl-N-methylpyrrolidinium hexafluorophosphate,

[0375] N-butyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide,

[0376] N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide,

[0377] N-butyl-N-methylpyrrolidinium p-toluenesulfonate, etc.

[0378] (Ammonium salt)

[0379] Tetrabutylammonium hexafluorophosphate,

[0380] Tetrabutylammonium bis(fluorosulfonyl)imide,

[0381] Tetrahexylammonium bis(fluorosulfonyl)imide,

[0382] Trioctylmethylammonium bis(fluorosulfonyl)imide,

[0383] (2-Hydroxyethyl)trimethylammonium bis(fluorosulfonyl)imide,

[0384] Tetrabutylammonium bis(trifluoromethanesulfonyl)imide,

[0385] Tetrahexylammonium bis(trifluoromethanesulfonyl)imide,

[0386] Trioctylmethylammonium bis(trifluoromethanesulfonyl)imide,

[0387] (2-Hydroxyethyl)trimethylammonium bis(trifluoromethanesulfonyl)imide,

[0388] Tetrabutylammonium p-toluenesulfonate,

[0389] Tetrahexyl ammonium p-toluenesulfonate,

[0390] Trioctylmethylammonium p-toluenesulfonate,

[0391] (2-Hydroxyethyl)trimethylammonium p-toluenesulfonate,

[0392] (2-Hydroxyethyl)trimethylammonium dimethylphosphinate,

[0393] 1-(3-Trimethoxysilylpropyl)-1,1,1-tributylammonium bis(trifluoromethanesulfonyl)imide,

[0394] 1-(3-Trimethoxysilylpropyl)-1,1,1-trimethylammonium bis(trifluoromethanesulfonyl)imide,

[0395] 1-(3-Trimethoxysilylbutyl)-1,1,1-tributylammonium bis(trifluoromethanesulfonyl)imide,

[0396] 1-(3-Trimethoxysilylbutyl)-1,1,1-trimethylammonium bis(trifluoromethanesulfonyl)imide,

[0397] N-{(3-triethoxysilylpropyl)carbamoyloxyethyl)}-N,N,N-trimethylammonium bis(trifluoromethanesulfonyl)imide, and

[0398] N-[2-{3-(3-trimethoxysilylpropylamino)-1-oxopropoxy}ethyl]-N,N,N-trimethylammonium bis(trifluoromethanesulfonyl)imide.

[0399] (Phosphonium Salt)

[0400] Tributyl(2-methoxyethyl)phosphoniumbis(trifluoromethanesulfonyl)imide,

[0401] Tributylmethylphosphonium bis(trifluoromethanesulfonyl)imide,

[0402] 1,1,1-Trimethyl-1-[(trimethoxysilyl)methyl]phosphonium bis(trifluoromethanesulfonyl)imide,

[0403] 1,1,1-Trimethyl-1-[2-(trimethoxysilyl)ethyl]phosphonium bis(trifluoromethanesulfonyl)imide,

[0404] 1,1,1-trimethyl-1-[3-(trimethoxysilyl)propyl]phosphonium bis(trifluoromethanesulfonyl)imide,

[0405] 1,1,1-trimethyl-1-[4-(trimethoxysilyl)butyl]phosphonium bis(trifluoromethanesulfonyl)imide,

[0406] 1,1,1-tributyl-1-[(trimethoxysilyl)methyl]phosphonium bis(trifluoromethanesulfonyl)imide,

[0407] 1,1,1-tributyl-1-[2-(trimethoxysilyl)ethyl]phosphonium bis(trifluoromethanesulfonyl)imide, and

[0408] 1,1,1-tributyl-1-[3-(trimethoxysilyl)propyl]phosphonium bis(trifluoromethanesulfonyl)imide.

[0409] These ionic compounds may be used alone or in combination of two or more.

[0410] From the perspective of further improving the vertical alignment of the polymerizable liquid crystal compound, the ionic compound preferably contains Si and / or F in the molecular structure of the cationic portion. If the ionic compound contains Si and / or F in the molecular structure of the cationic portion, it is easy to segregate the ionic compound on the surface of the light-absorbing anisotropic layer. Among them, as ionic compounds whose constituent elements are all non-metallic elements, the following ionic compounds (ii) to (iv) are preferred.

[0411] Ionic compounds (ii):

[0412] [Chemical Formula 9]

[0413]

[0414] Ionic compounds (iii):

[0415] [Chemical Formula 10]

[0416]

[0417] Ionic compounds (iv)

[0418] [Chemical Formula 11]

[0419]

[0420] As a method for improving the vertical alignment of polymerizable liquid crystal compounds, for example, a method of treating the surface of the first protective layer with a surfactant having an alkyl group with a relatively long chain length is known (for example, see Chapter 2 of "Liquid Crystal Handbook: Orientation and Physical Properties of Liquid Crystals" (published by Maruzen Co., Ltd.)). Such a method of using a surfactant to improve the vertical alignment of liquid crystal compounds can also be applied to ionic compounds. That is, by treating the surface of the first protective layer with an ionic compound having an alkyl group with a relatively long chain length, the vertical alignment of the polymerizable liquid crystal compound can be effectively improved.

[0421] Specifically, the ionic compound preferably satisfies the following relationship:

[0422] 5 <M<16。

[0423] M in the above relationship is represented by the following formula.

[0424] M = (the number of covalent bonds from the positively charged atom to the molecular chain terminal of the substituent with the largest number of covalent bonds to the molecular chain terminal among the substituents directly bonded to the positively charged atom) / (the number of positively charged atoms)

[0425] By making the ionic compound satisfy the above-mentioned relationship, the vertical alignment property of the polymerizable liquid crystal compound can be effectively improved.

[0426] When two or more positively charged atoms exist in a molecule of an ionic compound, for a substituent containing two or more positively charged atoms, the number of covalent bonds from the positively charged atom considered as the base point to the nearest other positively charged atom is used as the "number of covalent bonds from the positively charged atom to the molecular chain terminal" described in the definition of M above. When the ionic compound is an oligomer or polymer having two or more repeating units, M is calculated by considering the structural unit as a single molecule. When the positively charged atom is incorporated into a ring structure, the number of covalent bonds from the ring structure to the positively charged atom or the number of covalent bonds to the terminal of the substituent bonded to the ring structure, whichever is greater, is used as the "number of covalent bonds from the positively charged atom to the molecular chain terminal" described in the definition of M above.

[0427] When the composition for forming an anisotropic light-absorbing layer contains an ionic compound, its content is generally preferably 0.01 to 5% by mass, more preferably 0.05 to 4% by mass, and even more preferably 0.1 to 3% by mass relative to the solid content of the composition for forming anisotropic light-absorbing layer. When the content of the ionic compound is within this range, good coating properties of the composition for forming anisotropic light-absorbing layer can be maintained, while effectively promoting the homeotropic alignment of the polymerizable liquid crystal compound.

[0428] When the composition for forming an anisotropic light-absorbing layer contains a nonionic silane compound, the nonionic silane compound tends to reduce the surface tension of the composition for forming anisotropic light-absorbing layer. In a dried film of the composition for forming anisotropic light-absorbing layer formed on the first protective layer, the nonionic silane compound is present on the surface of the dried film opposite to the first protective layer, thereby enhancing the ability to control the homeotropic alignment of the polymerizable liquid crystal compound. This allows the polymerizable liquid crystal compound to align perpendicularly to the surface of the first protective layer within the dried film. This allows the polymerizable liquid crystal compound to maintain its homeotropic alignment, allowing the formation of a light-absorbing anisotropic layer as a liquid crystal cured film.

[0429] Nonionic silane compounds are nonionic compounds containing the element Si. Examples of nonionic silane compounds include silicone polymers such as polysilane, silicone resins such as silicone oil and silicone resin, silicone oligomers, organo-inorganic silane compounds such as silsesquioxane and alkoxysilane (more specifically, silane coupling agents, etc.), and silane-containing compounds described in the section on leveling agents.

[0430] The nonionic silane compound may be a silicone monomer type compound or a silicone oligomer (polymer) type compound. When the silicone oligomer is expressed in the form of a (monomer)-(monomer) copolymer, examples thereof include copolymers containing mercaptopropyl groups such as 3-mercaptopropyltrimethoxysilane-tetramethoxysilane copolymer, 3-mercaptopropyltrimethoxysilane-tetraethoxysilane copolymer, 3-mercaptopropyltriethoxysilane-tetramethoxysilane copolymer, and 3-mercaptopropyltriethoxysilane-tetraethoxysilane copolymer; and copolymers containing mercaptomethyltrimethoxysilane-tetramethoxysilane copolymer, mercaptomethyltrimethoxysilane-tetraethoxysilane copolymer, mercaptomethyltriethoxysilane-tetramethoxysilane copolymer, and mercaptomethyltriethoxysilane-tetraethoxysilane copolymer. Copolymers; 3-methacryloyloxypropyltrimethoxysilane-tetramethoxysilane copolymer, 3-methacryloyloxypropyltrimethoxysilane-tetraethoxysilane copolymer, 3-methacryloyloxypropyltriethoxysilane-tetramethoxysilane copolymer, 3-methacryloyloxypropyltriethoxysilane-tetraethoxysilane copolymer, 3-methacryloyloxypropylmethyldimethoxysilane-tetramethoxysilane copolymer, 3-methacryloyloxypropylmethyldimethoxysilane-tetraethoxysilane copolymer, 3-methacryloyloxypropylmethyldiethoxysilane-tetramethoxysilane copolymer and 3-methacryloyloxypropylmethyldimethoxysilane-tetraethoxysilane copolymer Copolymers containing methacryloxypropyl groups such as ethoxysilane-tetraethoxysilane copolymers; 3-acryloxypropyltrimethoxysilane-tetramethoxysilane copolymers, 3-acryloxypropyltrimethoxysilane-tetraethoxysilane copolymers, 3-acryloxypropyltriethoxysilane-tetramethoxysilane copolymers, 3-acryloxypropyltriethoxysilane-tetraethoxysilane copolymers, 3-acryloxypropylmethyldimethoxysilane-tetramethoxysilane copolymers, 3-acryloxypropylmethyldimethoxysilane-tetraethoxysilane copolymers, 3-acryloxypropylmethyldiethoxysilane-tetramethoxysilane copolymers and copolymers containing an acryloxypropyl group such as 3-acryloyloxypropylmethyldiethoxysilane-tetraethoxysilane copolymer; copolymers containing a vinyl group such as vinyltrimethoxysilane-tetramethoxysilane copolymer, vinyltrimethoxysilane-tetraethoxysilane copolymer, vinyltriethoxysilane-tetramethoxysilane copolymer, vinyltriethoxysilane-tetraethoxysilane copolymer, vinylmethyldimethoxysilane-tetramethoxysilane copolymer, vinylmethyldimethoxysilane-tetraethoxysilane copolymer, vinylmethyldiethoxysilane-tetramethoxysilane copolymer, and vinylmethyldiethoxysilane-tetraethoxysilane copolymer;Copolymers containing amino groups such as 3-aminopropyltrimethoxysilane-tetramethoxysilane copolymer, 3-aminopropyltrimethoxysilane-tetraethoxysilane copolymer, 3-aminopropyltriethoxysilane-tetramethoxysilane copolymer, 3-aminopropyltriethoxysilane-tetraethoxysilane copolymer, 3-aminopropylmethyldimethoxysilane-tetramethoxysilane copolymer, 3-aminopropylmethyldimethoxysilane-tetraethoxysilane copolymer, 3-aminopropylmethyldiethoxysilane-tetramethoxysilane copolymer, and 3-aminopropylmethyldiethoxysilane-tetraethoxysilane copolymer. These nonionic silane compounds can be used alone or in combination of two or more. Among them, silane coupling agents are preferred from the viewpoint of further improving adhesion to adjacent layers.

[0431] The silane coupling agent is a compound containing Si element having at least one functional group selected from the group consisting of vinyl, epoxy, styryl, methacrylic group, acrylic group, amino, isocyanurate, urea, mercapto, isocyanate, carboxyl and hydroxyl groups at the end, and at least one alkoxysilyl or silanol group. By appropriately selecting these functional groups, it is possible to impart excellent effects such as improving the mechanical strength of the light-absorbing anisotropic layer, surface modification of the light-absorbing anisotropic layer, and improving the adhesion between the light-absorbing anisotropic layer and the adjacent layer (e.g., the first protective layer or the third protective layer). From the viewpoint of adhesion, the silane coupling agent is preferably a silane coupling agent having an alkoxysilyl group and another different reactive group (e.g., the above-mentioned functional group). The silane coupling agent is preferably a silane coupling agent having an alkoxysilyl group and a polar group. If the silane coupling agent has at least one alkoxysilyl group and at least one polar group in its molecule, it is easy to further improve the vertical alignment of the polymerizable liquid crystal compound and significantly obtain a tendency to promote the effect of vertical alignment. As polar groups, for example, epoxy groups, amino groups, isocyanurate groups, mercapto groups, carboxyl groups and hydroxyl groups can be mentioned. The polar group can appropriately have a substituent or a protecting group in order to control the reactivity of the silane coupling agent.

[0432] Specific examples of the silane coupling agent include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltri(2-methoxyethoxy)silane, N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-triethoxysilyl-N-(1,3-dimethyl-butylidene)propylamine, 3-glycidoxypropyltrimethoxysilane, 3- Glycidoxypropylmethyldimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-chloropropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, 3-methacryloyloxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropyldimethoxymethylsilane, and 3-glycidoxypropylethoxydimethylsilane.

[0433] Examples of commercially available silane coupling agents include KP321, KP323, KP324, KP326, KP340, KP341, X22-161A, KF6001, KBM-1003, KBE-1003, KBM-303, KBM-402, KBM-403, KBE-402, KBE-403, KBM-1403, KBM-502, and KBM-503. Silane coupling agents manufactured by Shin-Etsu Chemical Co., Ltd., such as KBE-502, KBE-503, KBM-5103, KBM-602, KBM-603, KBM-903, KBE-903, KBE-9103, KBM-573, KBM-575, KBM-9659, KBE-585, KBM-802, KBM-803, KBE-846, and KBE-9007.

[0434] When the composition for forming an anisotropic light-absorbing layer contains a nonionic silane compound, its content is generally preferably 0.01% to 5% by mass, more preferably 0.05% to 4% by mass, and even more preferably 0.1% to 3% by mass, relative to the solid content of the composition for forming anisotropic light-absorbing layer. When the content of the nonionic silane compound is within this range, good coating properties of the composition for forming anisotropic light-absorbing layer can be maintained, while effectively promoting the homeotropic alignment of the polymerizable liquid crystal compound.

[0435] By including both an ionic compound and a nonionic silane compound in the composition for forming an anisotropic light-absorbing layer, the dried film of the composition for forming an anisotropic light-absorbing layer formed on the first protective layer is further facilitated by electrostatic interaction from the ionic compound and the surface tension-reducing effect of the nonionic silane compound. This allows the polymerizable liquid crystal compound to be maintained in a more precisely homeotropically aligned state, thereby forming a light-absorbing anisotropic layer as a liquid crystal cured film.

[0436] (Reactive Additives)

[0437] The composition for forming a light-absorbing anisotropic layer may contain a reactive additive. As a reactive additive, a reactive additive having a carbon-carbon unsaturated bond and an active hydrogen-reactive group in its molecule is preferably used. It should be noted that the so-called "active hydrogen-reactive group" here refers to a group that is reactive with a group containing active hydrogen, such as a carboxyl group (-COOH), a hydroxyl group (-OH), an amino group (-NH2), and its representative examples are a glycidyl group, an oxazoline group, a carbodiimide group, an aziridine group, an imide group, an isocyanate group, an isothiocyanate group, a maleic anhydride group, etc. The number of carbon-carbon unsaturated bonds or active hydrogen-reactive groups possessed by the reactive additive is usually 1 to 20 each, preferably 1 to 10 each.

[0438] The reactive additive preferably contains at least two active hydrogen-reactive groups. In this case, the plurality of active hydrogen-reactive groups may be the same or different.

[0439] The carbon-carbon unsaturated bond possessed by the reactive additive may be a carbon-carbon double bond, a carbon-carbon triple bond, or a combination thereof, but is preferably a carbon-carbon double bond. Among these, the reactive additive preferably contains a carbon-carbon unsaturated bond in the form of a vinyl group and / or a (meth)acrylic group. Furthermore, a reactive additive having an active hydrogen reactive group of at least one selected from the group consisting of an epoxy group, a glycidyl group, and an isocyanate group is preferred, and a reactive additive having an acrylic group and an isocyanate group is more preferred.

[0440] Specific examples of reactive additives include compounds having a (meth)acrylic group and an epoxy group, such as methacryloyloxyglycidyl ether and acryloyloxyglycidyl ether; compounds having a (meth)acrylic group and an oxetane group, such as oxetane acrylate and oxetane methacrylate; compounds having a (meth)acrylic group and a lactone group, such as lactone acrylate and lactone methacrylate; compounds having a vinyl group and an oxazoline group, such as vinyloxazoline and isopropenyloxazoline; oligomers of compounds having a (meth)acrylic group and an isocyanate group, such as isocyanatomethyl acrylate, isocyanatomethyl methacrylate, 2-isocyanatoethyl acrylate, or 2-isocyanatoethyl methacrylate. Furthermore, compounds having a vinyl group, a vinylidene group, and an acid anhydride, such as methacrylic anhydride, acrylic anhydride, maleic anhydride, or vinylmaleic anhydride, can be cited. Among them, preferred are methacryloyloxy glycidyl ether, acryloyloxy glycidyl ether, isocyanate methyl acrylate, isocyanate methyl methacrylate, vinyloxazoline, 2-isocyanate ethyl acrylate, 2-isocyanate ethyl methacrylate or oligomers thereof, and particularly preferred are isocyanate methyl acrylate, 2-isocyanate ethyl acrylate or oligomers thereof.

[0441] The reactive additive may be a commercially available product as it is or may be used after purification as needed. Examples of commercially available products include Laromer (registered trademark) LR-9000 (manufactured by BASF).

[0442] When the composition for forming a light-absorbing anisotropic layer contains a reactive additive, the content of the reactive additive is usually 0.01 to 10 parts by mass, preferably 0.1 to 5 parts by mass, based on 100 parts by mass of the polymerizable liquid crystal compound.

[0443] (Vertical Alignment Layer)

[0444] The vertical alignment layer has an alignment control force that causes the polymerizable liquid crystal compound in the composition for forming the light-absorbing anisotropic layer, used to form the light-absorbing anisotropic layer, to align perpendicularly to the plane of the light-absorbing anisotropic layer. In this specification, "the polymerizable liquid crystal compound is aligned perpendicularly" means that the long axis of the polymerizable liquid crystal compound is aligned perpendicularly, and the perpendicular direction refers to 90°±20° relative to the plane of the light-absorbing anisotropic layer. The state of liquid crystal alignment varies depending on the properties of the vertical alignment layer and the polymerizable liquid crystal compound, and their combination can be selected arbitrarily.

[0445] When the alignment layer is formed of an aligning polymer, the alignment control force can be arbitrarily adjusted by adjusting the surface state and friction conditions. When the alignment layer is formed of a photoaligning polymer, the alignment control force can be arbitrarily adjusted by adjusting the polarized light irradiation conditions, etc. Alternatively, the liquid crystal orientation can be controlled by selecting the surface tension, liquid crystal properties, and other physical properties of the polymerizable liquid crystal compound.

[0446] As the vertical alignment layer, it is preferred that the vertical alignment layer is insoluble in the solvent used when forming the light absorption anisotropic layer on the vertical alignment layer and has heat resistance in the heat treatment for removing the solvent and aligning the liquid crystal. The vertical alignment layer can be formed using a composition for forming a vertical alignment layer. As the vertical alignment layer, a polymer alignment layer formed by an aligning polymer, a photoalignment layer and a groove alignment layer, a stretched film stretched along the alignment direction, etc. can be cited. In the case of an elongated roll film, a photoalignment layer is preferred from the perspective of being able to easily control the alignment direction.

[0447] The thickness of the vertical alignment layer is generally in the range of 10 nm to 5000 nm, preferably in the range of 10 nm to 1000 nm, and more preferably in the range of 30 nm to 300 nm.

[0448] The composition for forming a vertical alignment layer of the rubbing alignment layer comprises an aligning polymer. As the aligning polymer, polyamides having an amide bond in the molecule, gelatins, polyimides having an imide bond in the molecule and polyamic acid as their hydrolysates, polyvinyl alcohol, alkyl-modified polyvinyl alcohol, polyacrylamide, polyoxazole, polyethyleneimine, polystyrene, polyvinyl pyrrolidone, polyacrylic acid and polyacrylates can be cited. Among them, polyvinyl alcohol is preferred from the viewpoint of suppressing the migration of azo dyes from adjacent layers. These aligning polymers can be used alone or in combination of two or more.

[0449] The oriented polymer composition containing an oriented polymer for forming the rubbed orientation layer (vertical orientation layer forming composition) may be a resin composition containing a water-soluble polymer (water-soluble polymer-containing resin composition) used in the protective layer forming composition for forming the protective layer described later.

[0450] The rubbing method includes a method in which an oriented polymer film formed by applying an oriented polymer composition to the surface of the first protective layer and annealing the oriented polymer composition to form the surface of the first protective layer is brought into contact with a rotating rubbing roller wrapped with a rubbing cloth.

[0451] The composition for forming a vertical alignment layer used to form the photo-alignment layer comprises a polymer, oligomer, or monomer having a photoreactive group. The photo-alignment layer can be formed by irradiating a coating layer formed by applying the composition for forming the photo-alignment layer (the composition for forming the vertical alignment layer) to the first protective layer with polarized light to obtain an alignment-controlling force. A photo-alignment layer is more preferred because the direction of the alignment-controlling force can be arbitrarily controlled by selecting the polarization direction of the irradiated polarized light.

[0452] The so-called photoreactive group refers to a group that generates liquid crystal orientation ability by irradiation with light. Specifically, it is a group that generates a photoreaction that is the source of liquid crystal orientation ability, such as an orientation-induced or isomerization reaction, dimerization reaction, photocrosslinking reaction or photodecomposition reaction of molecules generated by irradiation with light. Among the photoreactive groups, the group that undergoes dimerization reaction or photocrosslinking reaction is preferred from the perspective of excellent orientation. As a photoreactive group capable of the above reaction, it is preferably a group having an unsaturated bond, especially a double bond, and more preferably a group having at least one selected from the group consisting of a carbon-carbon double bond (C=C bond), a carbon-nitrogen double bond (C=N bond), a nitrogen-nitrogen double bond (N=N bond) and a carbon-oxygen double bond (C=O bond).

[0453] As photoreactive groups having C=C bonds, for example, vinyl, polyenyl, stilbene, stilbazolyl, stilbazolinium, chalcone and cinnamoyl groups can be cited. From the perspective of easy control of reactivity and the presentation of orientation control power during photo-orientation, chalcone and cinnamoyl groups are preferred. As photoreactive groups having C=N bonds, groups having structures such as aromatic Schiff bases and aromatic hydrazones can be cited. As photoreactive groups having N=N bonds, groups having azobenzene oxide as a basic structure such as azobenzene, azonaphthyl, aromatic heterocyclic azo, disazo and formazan can be cited. As photoreactive groups having C=O bonds, benzophenone, coumarin, anthraquinone and maleimide groups can be cited. These groups may have substituents such as alkyl, alkoxy, aryl, allyloxy, cyano, alkoxycarbonyl, hydroxyl, sulfonic acid and haloalkyl groups. From the perspective of excellent alignment and reactivity, the photo-aligning polymer preferably has a photoreactive group that undergoes a dimerization reaction or a photocrosslinking reaction, and more preferably has a photoreactive group that undergoes a dimerization reaction. Examples of such photoreactive groups include groups having a cinnamoyl structure, groups having a chalcone structure, groups having a coumarin structure, groups having a benzophenone structure, and groups having an anthracene structure. Among these, groups having a cinnamoyl structure and groups having a chalcone structure are preferred, and groups having a cinnamoyl structure are more preferred.

[0454] The method of irradiating polarized light may be a method of directly irradiating polarized light from the film surface of the coating layer of the composition for forming the photo-alignment layer, or a method of irradiating polarized light from the first protective layer side and allowing the polarized light to pass through to irradiate. In addition, the polarized light is particularly preferably substantially parallel light. The wavelength of the irradiated polarized light is a wavelength in the wavelength region where the photoreactive group of the polymer or monomer having a photoreactive group can absorb light energy. Specifically, UV (ultraviolet light) with a wavelength range of 250 to 400 nm is particularly preferred. As the light source used in the polarized light irradiation, xenon lamps, high-pressure mercury lamps, ultra-high-pressure mercury lamps, metal halide lamps, ultraviolet lasers such as KrF and ArF can be cited, and high-pressure mercury lamps, ultra-high-pressure mercury lamps and metal halide lamps are more preferred. The luminous intensity of the ultraviolet light with a wavelength of 313 nm of these lamps is large, so it is preferred. The light from the above-mentioned light source can be irradiated through an appropriate polarizer to irradiate the polarized light. As the polarizer, a polarizing filter, a polarizing prism such as a Glan-Thompson or Glan-Taylor polarizer, or a wire grid polarizer can be used.

[0455] (Base material layer)

[0456] The substrate layer may comprise one or more of a resin film (film substrate) and a glass substrate. The substrate layer may have a single-layer structure or a multi-layer structure. The substrate layer can support the liquid crystal polarizer or the transferred laminated portion. The substrate layer may be a layer to which a composition for forming a horizontal alignment layer is applied, or a layer to which a composition for forming a protective layer is applied to form a second protective layer.

[0457] Examples of the resin constituting the resin film include olefin resins such as polyethylene and polypropylene; cyclic olefin resins having a ring or norbornene structure; polyvinyl alcohol; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; (meth)acrylic resins; cellulose ester resins such as cellulose triacetate, cellulose diacetate, and cellulose acetate propionate; polyimide resins; polycarbonate; polysulfone; polyethersulfone; polyetherketone; polyphenylene sulfide; and polyphenylene ether. The term "(meth)acrylic" refers to at least one of "acrylic" and "methacrylic." This also applies to expressions such as (meth)acryloyl.

[0458] As the resin film, a commercially available cellulose ester resin film can be used. Examples of such cellulose ester resin films include "Fujitac Film" (manufactured by Fuji Photo Film Co., Ltd.); "KC8UX2M," "KC8UY," and "KC4UY" (all manufactured by Konica Minolta Opto Co., Ltd.).

[0459] When forming a second protective layer on a resin film, the surface of the resin film on which the second protective layer is to be formed may be subjected to a release treatment (forming a release layer by applying a release agent, etc.). This facilitates peeling of the resin film when peeling the substrate layer (resin film) from the optical laminate.

[0460] The thickness of the substrate layer is preferably 0.5 μm to 100 μm, or 0.5 μm to 80 μm, or 1 μm to 60 μm, or 1 μm to 40 μm, or 1 μm to 30 μm, or 1 μm to 20 μm.

[0461] The thickness of the resin film that can be included in the base layer is preferably thin from the perspective of quality to enable practical handling. However, if it is too thin, the strength is reduced and the processability tends to be poor. From this perspective, the thickness of the resin film is preferably 5 μm to 100 μm, more preferably 10 μm to 80 μm, even more preferably 10 μm to 40 μm, and may also be 10 μm to 30 μm.

[0462] (Phase Difference Element (First Liquid Crystal Phase Difference Layer, Second Liquid Crystal Phase Difference Layer))

[0463] The optical laminate may include a phase difference element ( Figure 3 、 Figure 4 The phase difference element may be a phase difference layer as a stretched film, or a liquid crystal phase difference layer including a polymer of a polymerizable liquid crystal compound, such as the first liquid crystal phase difference layer and the second liquid crystal phase difference layer. The phase difference element is preferably a liquid crystal phase difference layer.

[0464] When the optical laminate constitutes an elliptically polarizing plate, the in-plane phase difference of the phase difference element for light of wavelength λ [nm], i.e., R(λ), preferably satisfies the optical characteristics shown in the following formula (4), preferably satisfies the optical characteristics shown in the following formula (4), the following formula (5) and the following formula (6).

[0465] 100nm <Re(550)<160nm (4)

[0466] Re(450) / Re(550)≤1.00 (5)

[0467] 1.00≤Re(650) / Re(550) (6)

[0468] [In formulas (4) to (6),

[0469] Re(550) represents the in-plane phase difference value (in-plane retardation) of the phase difference element for light of a wavelength of 550 nm.

[0470] Re(450) represents the in-plane retardation value of the retardation element for light with a wavelength of 450 nm.

[0471] Re(650) represents the in-plane retardation value of the retardation element for light with a wavelength of 650 nm.

[0472] If "Re(450) / Re(550)" in the above formula (5) is greater than 1.0, light leakage on the short wavelength side of the elliptically polarizing plate having a λ / 4 retardation element increases. "Re(450) / Re(550)" is preferably 0.70 to 1.00, more preferably 0.80 to 0.95, further preferably 0.80 to 0.92, and particularly preferably 0.82 to 0.88. The value of "Re(450) / Re(550)" can be arbitrarily adjusted by adjusting the stacking angle and retardation value of the plurality of retardation elements constituting the retardation element, and adjusting the mixing ratio of the polymerizable liquid crystal compound constituting the retardation element.

[0473] The in-plane phase difference value of the phase difference element can be adjusted by the thickness of the phase difference element. The in-plane phase difference value is determined by the following formula (7). Therefore, in order to make the in-plane phase difference value (Re(λ)) at the wavelength λ[nm] the desired value, it is sufficient to adjust Δn(λ) and the film thickness d. The thickness of the phase difference element is preferably 0.5μm to 5μm, more preferably 1μm to 3μm. The thickness can be measured using an interference film thickness meter, a laser microscope or a stylus film thickness meter. It should be noted that when the phase difference element is a liquid crystal phase difference layer, Δn(λ) depends on the molecular structure of the polymerizable liquid crystal compound.

[0474] Re(λ)=d×Δn(λ) (7)

[0475] [In formula (7),

[0476] Re(λ) represents the in-plane retardation value of the retardation element at wavelength λ [nm],

[0477] d represents the thickness of the phase difference element,

[0478] Δn(λ) represents the birefringence of the phase difference element at wavelength λ [nm].

[0479] The optical laminate may include a positive C plate as a retardation element. The thickness-direction retardation value Rth(550) of the positive C plate at a wavelength of 550 nm is typically in the range of -170 nm to 10 nm, preferably -150 nm to 20 nm, and more preferably -100 nm to 40 nm. When the thickness-direction retardation value of the positive C plate falls within this range, the ability to prevent oblique reflections can be further enhanced.

[0480] As the phase difference layer of the stretched film, a conventionally known stretched film can be used, and a stretched film imparted with a phase difference by uniaxially stretching or biaxially stretching a resin film can be used. As the resin film, cellulose films such as cellulose triacetate and cellulose diacetate, polyester films such as polyethylene terephthalate, polyethylene isophthalate, and polybutylene terephthalate, acrylic resin films such as polymethyl (meth)acrylate and polyethyl (meth)acrylate, polycarbonate films, polyethersulfone films, polysulfone films, polyimide films, polyolefin films, polynorbornene films, etc. can be used, but are not limited thereto.

[0481] The thickness of the retardation layer is usually 5 μm to 200 μm, preferably 10 μm to 80 μm, and more preferably 40 μm to 40 μm.

[0482] When the phase difference element is a liquid crystal phase difference layer such as the first liquid crystal phase difference layer or the second liquid crystal phase difference layer, the liquid crystal phase difference layer may comprise a liquid crystal cured film formed by applying a composition for forming a liquid crystal phase difference layer containing a polymerizable liquid crystal compound to a film substrate. The liquid crystal phase difference layer may be a liquid crystal cured film or a laminate of a liquid crystal cured film and an alignment layer. The liquid crystal phase difference layer exhibits a phase difference in the in-plane direction or the thickness direction.

[0483] The thickness of the liquid crystal retardation layer is preferably from 0.5 μm to 5 μm, and more preferably from 1 μm to 3 μm.

[0484] As a film substrate to be coated with a composition for forming a liquid crystal phase difference layer, a resin film exemplified as a substrate layer can be cited. The film substrate can be peeled off and removed when making the optical laminate 3 and 4, or it can be used as a protective film for the liquid crystal phase difference layer without peeling off and removing. Regarding polymerizable liquid crystal compounds, polymerizable liquid crystal compounds having, in particular, a photopolymerizable group as a polymerizable group can be used. As polymerizable liquid crystal compounds, for example, polymerizable liquid crystal compounds previously known in the field of liquid crystal phase difference layers can be used. The so-called photopolymerizable group refers to a group that can participate in the polymerization reaction using reactive species such as active free radicals, acids, etc. generated by a photopolymerization initiator. As photopolymerizable groups, vinyl, vinyloxy, 1-chlorovinyl, isopropenyl, 4-vinylphenyl, acryloyloxy, methacryloyloxy, oxacyclopropyl, oxetane, etc. can be cited. Among them, acryloyloxy, methacryloyloxy, vinyloxy, oxacyclopropyl and oxetane are preferred, and acryloyloxy is more preferred. Regarding liquid crystal properties, it can be either a thermotropic liquid crystal or a lyotropic liquid crystal, but thermotropic liquid crystals are preferred from the perspective of enabling precise film thickness control. Furthermore, the phase-ordered structure in the thermotropic liquid crystal can be either a nematic liquid crystal or a smectic liquid crystal. Furthermore, it can be either a rod-shaped liquid crystal or a disc-shaped liquid crystal. The polymerizable liquid crystal compound can be used alone or in combination of two or more.

[0485] The polymerizable liquid crystal compound contained in the λ / 4 liquid crystal phase difference layer contained in the liquid crystal phase difference layer is preferably a liquid crystal having a T-type or H-type mesomorphic structure and further having birefringence in a direction perpendicular to the long axis direction of the molecule, from the viewpoint of exhibiting reverse wavelength dispersion. From the viewpoint of obtaining stronger dispersion, a T-type liquid crystal is more preferred. Specifically, as the structure of the T-type liquid crystal, for example, a compound represented by the following formula (II) can be cited.

[0486] [Chemical Formula 12]

[0487]

[0488] [In formula (II),

[0489] Ar represents a divalent aromatic group which may have a substituent. Preferably, the divalent aromatic group contains at least one of a nitrogen atom, an oxygen atom, and a sulfur atom. When the divalent group Ar contains two or more aromatic groups, the two or more aromatic groups may be bonded to each other via a divalent bonding group such as a single bond, -CO-O-, or -O-.

[0490] G 1 and G 2Each independently represents a divalent aromatic group or a divalent alicyclic hydrocarbon group. Here, hydrogen atoms contained in the divalent aromatic group or divalent alicyclic hydrocarbon group may be substituted with a halogen atom, an alkyl group having 1 to 4 carbon atoms, a fluoroalkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a cyano group, or a nitro group, and the carbon atoms constituting the divalent aromatic group or divalent alicyclic hydrocarbon group may be replaced with an oxygen atom, a sulfur atom, or a nitrogen atom.

[0491] L 1 、L 2 、B 1 and B 2 Each is independently a single bond or a divalent linking group.

[0492] k and l each independently represent an integer from 0 to 3 and satisfy the relationship 1≤k+1. Here, when 2≤k+1, B 1 and B 2 , G 1 and G 2 They can be the same as or different from each other.

[0493] E 1 and E 2 Each independently represents an alkanediyl group having 1 to 17 carbon atoms, wherein the hydrogen atoms contained in the alkanediyl group may be substituted by halogen atoms, and the -CH2- contained in the alkanediyl group may be substituted by -O-, -S-, or -COO-. When there are multiple -O-, -S-, or -COO- groups, they are not adjacent to each other.

[0494] P 1 and P 2 Each independently represents a polymerizable group or a hydrogen atom, and at least one of them is a polymerizable group.]

[0495] G 1 and G 2 Each independently preferably is a 1,4-phenylenediyl group which may be substituted with at least one substituent selected from the group consisting of a halogen atom and an alkyl group having 1 to 4 carbon atoms, or a 1,4-cyclohexanediyl group which may be substituted with at least one substituent selected from the group consisting of a halogen atom and an alkyl group having 1 to 4 carbon atoms. More preferably, it is a 1,4-phenylenediyl group substituted with a methyl group, an unsubstituted 1,4-phenylenediyl group, or an unsubstituted 1,4-trans-cyclohexanediyl group. Particularly preferably, it is an unsubstituted 1,4-phenylenediyl group or an unsubstituted 1,4-trans-cyclohexanediyl group.

[0496] In addition, it is preferred that there are multiple G 1 and G 2 At least one of them is a divalent alicyclic hydrocarbon group, and more preferably 1 or L 2 Bonded G1 and G 2 At least one of them is a divalent alicyclic hydrocarbon group.

[0497] L 1 and L 2 Each of them is independently preferably a single bond, an alkylene group having 1 to 4 carbon atoms, -O-, -S-, -R a1 OR a2 -、-R a3 COOR a4 -、-R a5 OCOR a6 -、-R a7 OC=OOR a8 -、-N=N-、-CR c =CR d -, or -C≡C-. Here, R a1 ~R a8 Each independently represents a single bond or an alkylene group having 1 to 4 carbon atoms, R c and R d represents an alkyl group having 1 to 4 carbon atoms or a hydrogen atom. 1 and L 2 More preferably, each independently represents a single bond, -O Ra2-1 -、-CH2-、-CH2CH2-、-COOR a4-1 -, or -OCOR a6-1 -. Here, R a2-1 、R a4-1 、R a6-1 Each independently represents a single bond, -CH2-, or -CH2CH2-. 1 and L 2 Each independently is further preferably a single bond, -O-, -CH2CH2-, -COO-, -COOCH2CH2-, or -OCO-.

[0498] B 1 and B 2 Each of them is independently preferably a single bond, an alkylene group having 1 to 4 carbon atoms, -O-, -S-, -R a9 OR a10 -、-R a11 COOR a12 -、-R a13 OCOR a14 -, or -R a15 OC=OOR a16 -. Here, R a9 ~R a16 Each independently represents a single bond or an alkylene group having 1 to 4 carbon atoms. 1 and B 2More preferably, each independently represents a single bond, -OR a10-1 -、-CH2-、-CH2CH2-、-COOR a12 -1 -, or -OCOR a14-1 -. Here, R a10-1 、R a12-1 、R a14-1 Each independently represents a single bond, -CH2-, or -CH2CH2-. 1 and B 2 Each independently is further preferably a single bond, -O-, -CH2CH2-, -COO-, -COOCH2CH2-, -OCO-, or -OCOCH2CH2-.

[0499] From the viewpoint of exhibiting reverse wavelength dispersion, k and l are preferably in the range of 2≤k+l≤6, preferably k+l=4, and more preferably k=2 and l=2. k=2 and l=2 are preferred because they form a symmetrical structure.

[0500] E 1 and E 2 Each independently is preferably an alkanediyl group having 1 to 17 carbon atoms, and more preferably an alkanediyl group having 4 to 12 carbon atoms.

[0501] As P 1 or P 2 The polymerizable group represented by includes an epoxy group, a vinyl group, a vinyloxy group, a 1-chlorovinyl group, an isopropenyl group, a 4-vinylphenyl group, an acryloyloxy group, a methacryloyloxy group, an oxirane group, and an oxetanyl group. Among them, an acryloyloxy group, a methacryloyloxy group, a vinyloxy group, an oxirane group, and an oxetanyl group are preferred, and an acryloyloxy group is more preferred.

[0502] Ar preferably has at least one selected from the aromatic hydrocarbon ring that can have a substituent, the aromatic heterocycle that can have a substituent, and the electron-withdrawing group.As the aromatic hydrocarbon ring, for example, benzene ring, naphthalene ring, anthracene ring etc. can be enumerated, preferably benzene ring, naphthalene ring.As the aromatic heterocycle, furan ring, benzofuran ring, pyrrole ring, indole ring, thiophene ring, benzothiophene ring, pyridine ring, pyrazine ring, pyrimidine ring, triazole ring, triazine ring, pyrroline ring, imidazole ring, pyrazole ring, thiazole ring, benzothiazole ring, thienothiazole ring, oxazole ring, benzoxazole ring and phenanthroline ring etc. can be enumerated.Wherein, preferably have thiazole ring, benzothiazole ring or benzofuran ring, further preferably have benzothiazolyl.In addition, when containing nitrogen atom in Ar, the nitrogen atom preferably has π electrons.

[0503] In formula (II), the total number Nπ of π electrons contained in the divalent aromatic group represented by Ar is preferably 8 or more, more preferably 10 or more, further preferably 14 or more, and particularly preferably 16 or more. It is preferably 30 or less, more preferably 26 or less, and even more preferably 24 or less.

[0504] Preferred examples of the aromatic group represented by Ar include the following groups.

[0505] [Chemical Formula 13]

[0506]

[0507] [In formulas (Ar-1) to (Ar-23),

[0508] The symbol * indicates a connection part.

[0509] Z 0 , Z 1 and Z 2 Each independently represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 12 carbon atoms, a cyano group, a nitro group, an alkylsulfinyl group having 1 to 12 carbon atoms, an alkylsulfonyl group having 1 to 12 carbon atoms, a carboxyl group, a fluoroalkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an alkylthio group having 1 to 12 carbon atoms, an N-alkylamino group having 1 to 12 carbon atoms, an N,N-dialkylamino group having 2 to 12 carbon atoms, an N-alkylsulfamoyl group having 1 to 12 carbon atoms, or an N,N-dialkylsulfamoyl group having 2 to 12 carbon atoms.

[0510] Q 1 and Q 2 Each independently represents -CR 2’ R 3’ -、-S-、-NH-、-NR 2’ -、-CO- or O-,R 2 ' and R 3’ Each independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.

[0511] J 1 and J 2 Each independently represents a carbon atom or a nitrogen atom.

[0512] Y 1 、Y 2 and Y 3 Each independently represents an aromatic hydrocarbon group or an aromatic heterocyclic group which may be substituted.

[0513] W 1 and W 2 Each independently represents a hydrogen atom, a cyano group, a methyl group or a halogen atom.

[0514] m represents an integer from 0 to 6.]

[0515] As Y 1 、Y 2 and Y 3 Examples of the aromatic hydrocarbon group in the group include aromatic hydrocarbon groups having 6 to 20 carbon atoms, such as phenyl, naphthyl, anthracenyl, phenanthrenyl, and biphenyl, preferably phenyl and naphthyl, and more preferably phenyl. Examples of the aromatic heterocyclic group include aromatic heterocyclic groups having 4 to 20 carbon atoms, such as furyl, pyrrolyl, thienyl, pyridyl, thiazolyl, and benzothiazolyl, which contain at least one heteroatom such as a nitrogen atom, an oxygen atom, or a sulfur atom, preferably furyl, thienyl, pyridyl, thiazolyl, and benzothiazolyl.

[0516] Y 1 、Y 2 and Y 3 Each independently may be a substituted polycyclic aromatic hydrocarbon group or a polycyclic aromatic heterocyclic group. A polycyclic aromatic hydrocarbon group refers to a fused polycyclic aromatic hydrocarbon group or a group derived from an aggregate of aromatic rings. A polycyclic aromatic heterocyclic group refers to a fused polycyclic aromatic heterocyclic group or a group derived from an aggregate of aromatic rings.

[0517] Z 0 , Z 1 and Z 2 Each of them is independently preferably a hydrogen atom, a halogen atom, an alkyl group having 1 to 12 carbon atoms, a cyano group, a nitro group, an alkoxy group having 1 to 12 carbon atoms, 0 More preferably, a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, or a cyano group, Z 1 and Z 2 More preferred are a hydrogen atom, a fluorine atom, a chlorine atom, a methyl group, and a cyano group.

[0518] Q 1 and Q 2 Preferred are -NH-, -S-, and -NR 2’ -、-O-,R 2’ A hydrogen atom is preferred, and among them, -S-, -O-, and -NH- are particularly preferred.

[0519] Among the compounds represented by formulae (Ar-1) to (Ar-23), compounds represented by formulae (Ar-6) and (Ar-7) are preferred from the viewpoint of molecular stability.

[0520] In the compounds represented by formula (Ar-16) to (Ar-23), Y 1 The nitrogen atom and Z 0Together they form an aromatic heterocyclic group. Examples of the aromatic heterocyclic group include the aromatic heterocyclic rings described above as the aromatic heterocyclic rings that Ar may have, such as a pyrrole ring, an imidazole ring, a pyrroline ring, a pyridine ring, a pyrazine ring, a pyrimidine ring, an indole ring, a quinoline ring, an isoquinoline ring, a purine ring, and a pyrrolidine ring. The aromatic heterocyclic group may have a substituent. In addition, Y 1 It can also be bonded to the nitrogen atom and Z 0 Together they form the aforementioned optionally substituted polycyclic aromatic hydrocarbon group or polycyclic aromatic heterocyclic group, for example, a benzofuran ring, a benzothiazole ring, a benzoxazole ring, and the like.

[0521] Among the polymerizable liquid crystal compounds, compounds having a maximum absorption wavelength of 300 to 400 nm are preferred. When a photopolymerization initiator is contained in a composition for forming a liquid crystal phase difference layer comprising a polymerizable liquid crystal compound, there is concern about the polymerization reaction and gelation of the polymerizable liquid crystal compound during long-term storage. However, when the maximum absorption wavelength of the polymerizable liquid crystal compound is 300 to 400 nm, even if it is exposed to ultraviolet light during storage, it is possible to effectively suppress the generation of reactive species from the photopolymerization initiator and the polymerization reaction and gelation of the polymerizable liquid crystal compound caused by the reactive species. Therefore, from the perspective of the long-term stability of the composition for forming a liquid crystal phase difference layer, it is advantageous and can improve the orientation and uniformity of the film thickness of the liquid crystal phase difference layer. It should be noted that the maximum absorption wavelength of the polymerizable liquid crystal compound can be measured in a solvent using an ultraviolet-visible spectrophotometer. The solvent is a solvent that can dissolve the polymerizable liquid crystal compound, and examples thereof include chloroform.

[0522] The content of the polymerizable liquid crystal compound in the composition for forming a liquid crystal retardation layer is, for example, 70 to 99.5 parts by mass, preferably 80 to 99 parts by mass, more preferably 85 to 98 parts by mass, and even more preferably 90 to 95 parts by mass, relative to 100 parts by mass of the solid content of the composition for forming a liquid crystal retardation layer. When the content of the polymerizable liquid crystal compound is within the above range, it is advantageous from the viewpoint of the orientation of the resulting liquid crystal cured film.

[0523] The liquid crystal phase difference layer may include an orientation layer. The orientation layer can be selected according to the direction in which the polymerizable liquid crystal compound is oriented. For example, it can be a vertical orientation layer or a horizontal orientation layer. When the orientation layer is a material that serves as an orientation control force to make it present a horizontal orientation, the polymerizable liquid crystal compound can form a horizontal orientation or a mixed orientation. When it is a material that makes it present a vertical orientation, the polymerizable liquid crystal compound can form a vertical orientation or an inclined orientation. Expressions such as horizontal and vertical indicate the direction of the long axis of the polymerizable liquid crystal compound that has been oriented when the plane of the liquid crystal phase difference layer is used as a reference. For example, the so-called vertical orientation refers to the long axis of the polymerizable liquid crystal compound that has been oriented in a direction perpendicular to the plane of the liquid crystal phase difference layer. The so-called vertical here refers to 90°±20° relative to the plane of the liquid crystal phase difference layer. As the orientation layer, the orientation layer described in the above-mentioned vertical orientation layer and horizontal orientation layer can be cited.

[0524] (First adhesive layer, second adhesive layer)

[0525] The first tackiness adhesive layer 21 and the second tackiness adhesive layer 23 (hereinafter, these are also collectively referred to as “tackiness adhesive layers”) that can be used in the optical layered bodies 1 to 4 are pressure-sensitive adhesive layers or adhesive layers.

[0526] The adhesive layer can be formed using an adhesive composition. Adhesive compositions or reaction products of adhesive compositions are substances that exhibit adhesive properties by being attached to an adherend and are referred to as pressure-sensitive adhesives. Furthermore, adhesive layers formed using active energy ray-curable adhesive compositions, described below, can have their degree of crosslinking and adhesive strength adjusted by irradiation with active energy rays.

[0527] As adhesive composition, can use the adhesive of excellent optical transparency known in the past without particular restriction, for example, can use the adhesive composition containing the base polymers such as acrylic polymer, urethane polymer, organosilicon polymer, polyvinyl ether.In addition, adhesive composition can be active energy ray curing type adhesive composition or heat-curing adhesive composition etc.Among them, the adhesive composition of the acrylic resin as base polymer of excellent transparency, bonding strength, re-peelability (re-operability), weatherability, heat resistance etc. is preferred.Adhesive layer is preferably made of the reaction product of the adhesive composition comprising (methyl) acrylic resin, crosslinking agent, silane compound, and also can comprise other components.

[0528] The adhesive composition for forming the adhesive layer can include base polymers such as acrylic polymers, urethane polymers, silicone polymers, polyvinyl ethers. The adhesive composition can be an active energy ray curing adhesive, a heat-curing adhesive, etc. Among them, it is preferred that the adhesive layer be a base polymer made of (meth) acrylic resin having excellent transparency, adhesion, re-peelability (re-operability), weather resistance, heat resistance, etc. The reaction product of the adhesive layer is preferably composed of a (meth) acrylic resin, a cross-linking agent, a silane compound, and may also include other components.

[0529] The adhesive layer can be formed using an active energy ray curing adhesive. For active energy ray curing adhesives, by adding a UV curable compound such as a multifunctional acrylate to the above-mentioned adhesive composition and curing it by irradiating it with ultraviolet rays after forming the adhesive layer, a harder adhesive layer can be formed. Active energy ray curing adhesives have the property of being cured by irradiation with energy rays such as ultraviolet rays and electron beams. Active energy ray curing adhesives also have adhesiveness before energy ray irradiation, and therefore have the property of being able to adhere to the adherend, being cured by irradiation with energy rays, and adjusting the adhesion.

[0530] The thickness of the adhesive layer is not particularly limited, but is usually 5 μm to 300 μm, 10 μm to 250 μm, 15 μm to 100 μm, or 20 μm to 50 μm.

[0531] The adhesive layer can be formed using an adhesive composition. Examples of the adhesive composition used to form the adhesive layer include adhesives other than pressure-sensitive adhesives (adhesives), and include water-based adhesives and active energy ray-curable adhesives.

[0532] Examples of water-based adhesives include those obtained by dissolving or dispersing polyvinyl alcohol resin in water. The drying method when using a water-based adhesive is not particularly limited, and for example, a hot air dryer or infrared dryer can be used.

[0533] Examples of active energy ray-curable adhesives include solvent-free active energy ray-curable adhesives containing a curable compound that cures upon exposure to active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays. Use of solvent-free active energy ray-curable adhesives can improve interlayer adhesion.

[0534] The thickness of the adhesive layer is preferably 0.1 μm or more, and may be 0.5 μm or more. It is preferably 10 μm or less, and may be 5 μm or less.

[0535] (Application of optical laminate)

[0536] The optical laminate can be applied to a display device. As a display device, an organic EL display device can be cited. The organic EL display device can have a structure in which the above-mentioned optical laminate is laminated on an image display element via an adhesive layer. In the organic EL display device, the optical laminate is assembled in a manner in which a light absorption anisotropic layer, a liquid crystal polarizer, and an image display element are arranged in this order from the viewing side. As an adhesive layer, the adhesive layer described above can be cited. As mentioned above, when the optical laminate is an elliptically polarizing plate, the optical laminate can be used as an anti-reflection film.

[0537] Example

[0538] The present invention will be described in more detail below with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples. Unless otherwise specified, "%" and "parts" in Examples and Comparative Examples are by mass % and by mass parts.

[0539] [Preparation of base material layer]

[0540] (Base layer (1): TAC film)

[0541] A triacetyl cellulose (TAC) film ("KC4UY-TAC" manufactured by Konica Minolta Co., Ltd.) was prepared. The thickness of the TAC film was 40 μm.

[0542] (Substrate layer (2): PET film subjected to release treatment)

[0543] A mold release-treated stretched polyethylene terephthalate (PET) film ("SP-PLR382050" manufactured by LINTEC) was prepared. The thickness of the PET film was 38 μm.

[0544] (Substrate layer (3): saponified TAC film)

[0545] A saponified triacetyl cellulose (TAC) film having a thickness of 40 μm was prepared.

[0546] [Preparation of Composition for Forming Horizontal Alignment Layer]

[0547] (Synthesis of Oriented Polymer)

[0548] According to the synthesis route shown below, an oriented polymer formed from the structural unit represented by formula (1-1-1) (hereinafter also referred to as "oriented polymer (1-1-1)") was synthesized.

[0549] [Chemical Formula 14]

[0550]

[0551] (Synthesis of the compound represented by formula (a1-1-1))

[0552] 50 g (258 mmol) of ferulic acid was dissolved in 360 g of methanol. 10 g of sulfuric acid was added to the obtained solution at room temperature, and after the temperature was raised to reflux of the solvent, the reaction was carried out under reflux for 2 hours. After cooling the obtained reaction solution, 150 g of ice and 150 g of water were added. The supernatant was removed by decantation, and 150 g of water at 5°C was further added to crystallize it. The obtained white crystals were filtered. The filtered white crystals were further washed with a 1 M aqueous sodium bicarbonate solution and water, and then vacuum dried to obtain 22.2 g of a compound represented by formula (a1-1-1) (hereinafter also referred to as "compound (a1-1-1)".). The yield was 83% based on ferulic acid.

[0553] (Synthesis of the compound represented by formula (b1-1-1))

[0554] 25 g (120 mmol) of compound (a1-1-1) was dissolved in 250 g of dimethylacetamide. 33.19 g (240 mmol) of potassium carbonate and 1.99 g (12 mmol) of potassium iodide were added to the obtained solution. 6-chlorohexanol was added dropwise to the obtained dispersion, stirred at room temperature for 1 hour, and then stirred at 70°C for 8 hours. The obtained reaction solution was filtered to remove insoluble matter. 200 g of methyl isobutyl ketone and 300 g of water were added to the filtrate, stirred and allowed to stand, and the liquid was separated to recover the organic layer. A series of washing operations of adding 200 g of water to the recovered organic layer, stirring, standing and separating the liquid was repeated twice. The solvent was removed from the recovered organic layer by vacuum distillation using an evaporator to obtain a crude product of the compound represented by formula (b1-1-1) (hereinafter also referred to as "compound (b1-1-1)").

[0555] (Synthesis of the compound represented by formula (c1-1-1))

[0556] The entire amount of the crude product of compound (b1-1-1) was dissolved in 185 g of ethanol. 92 g of water and 14.41 g (360 mmol) of sodium hydroxide were added to the resulting solution, and the mixture was stirred at 80°C for 1 hour. The reaction solution was cooled to about 3°C, and then, while maintaining the temperature below 5°C, a 2M aqueous hydrochloric acid solution was added to adjust the pH to 2. The white precipitate obtained by acid precipitation was filtered out, and after washing twice with a mixed solution of 100 g of water and 80 g of methanol, it was vacuum dried to obtain 30.4 g of the compound represented by formula (c1-1-1) (hereinafter also referred to as "compound (c1-1-1)". The yield was 86% based on compound (a1-1-1).

[0557] (Synthesis of Compound Represented by Formula (M1-1-1))

[0558] 27.46 g (93 mmol) of compound (c1-1-1) was dissolved in 280 g of chloroform. 2.06 g of BHT (di-tert-butylhydroxytoluene) and 37.73 g (373 mmol) of triethylamine were added to the obtained solution as a polymerization inhibitor, and the mixture was stirred under ice cooling. 29.26 g (260 mmol) of methacryloyl chloride was added dropwise to the reaction solution, and the temperature was kept below 5°C and stirred for 5 hours. 5.7 g of dimethylaminopyridine and 190 g of water were added to the obtained reaction solution, and the mixture was stirred at room temperature for 12 hours. After standing, the organic layer was recovered, and a series of washing operations of adding 100 g of 2N hydrochloric acid aqueous solution to the organic layer, stirring, standing and separating the liquids was repeated twice. The organic layer was recovered, 300 g of n-heptane was added, and the precipitated crystals were filtered out. After washing twice with a mixed solvent of 100 g of water and 80 g of methanol, vacuum drying was performed to obtain 22.0 g of a compound represented by formula (M1-1-1) (hereinafter also referred to as "compound (M1-1-1)"). The yield based on compound (c1-1-1) was 65%.

[0559] (Synthesis of Oriented Polymer (1-1-1))

[0560] 1.00 g (2.76 mmol) of compound (M1-1-1) and 10 g of tetrahydrofuran were added to a Schlenk tube. After deoxygenation, 2.27 mg of azobisisobutyronitrile (AIBN) was added while circulating nitrogen, and stirred at 60 ° C for 72 hours. The resulting reaction solution was added to 200 g of toluene. The precipitate was filtered, washed with heptane, and then vacuum-dried to obtain 0.75 g of an oriented polymer (1-1-1). The yield was 75% based on the compound (M1-1-1). According to GPC measurement, the number average molecular weight of the obtained oriented polymer (1-1-1) was 28200, the weight average molecular weight was about 51300, the Mw / Mn was 1.82, and the monomer content was 0.5%.

[0561] (Preparation of the horizontal alignment layer forming composition (1))

[0562] 2 parts of the aligning polymer (1-1-1) and 98 parts of o-xylene were mixed, and the mixture was stirred at 80° C. for 1 hour to obtain a composition (1) for forming a horizontal alignment layer.

[0563] (Preparation of the horizontal alignment layer forming composition (2))

[0564] To the composition (1) for forming a horizontal alignment layer obtained above, 3-aminopropyltriethoxysilane ("KBE-903" manufactured by Shin-Etsu Chemical Co., Ltd.) was added and mixed in an amount of 1.0 part relative to 100 parts of the alignment polymer (1-1-1), thereby obtaining a composition (2) for forming a horizontal alignment layer.

[0565] [Preparation of Liquid Crystal Polarizer Forming Composition]

[0566] (Preparation of Liquid Crystal Polarizer Forming Composition (1))

[0567] The components shown below were mixed and stirred at 80° C. for 1 hour to obtain a composition (1) for forming a liquid crystal polarizer.

[0568] Polymerizable liquid crystal compound (1): 75 parts

[0569] Polymerizable liquid crystal compound (2): 25 parts

[0570] Dichroic pigment (azo pigment) (1): 2.8 parts

[0571] Dichroic pigment (azo pigment) (2): 2.8 parts

[0572] Dichroic pigment (azo pigment) (3): 2.8 parts

[0573] Polymerization initiator (2-dimethylamino-2-benzyl-1-(4-morpholinophenyl)butan-1-one (Irgacure 369, manufactured by BASF)): 6 parts

[0574] Leveling agent (polyacrylate compound (BYK-361N, manufactured by BYK-Chemie): 1.2 parts

[0575] Solvent (cyclopentanone): 250 parts

[0576] The polymerizable liquid crystal compounds (1) and (2) have the structures shown below and were synthesized according to the method described in Lub et al., Recl. Trav. Chim. Pays-Bas, 115, 321-328 (1996).

[0577] Polymerizable liquid crystal compound (1):

[0578] [Chemical Formula 15]

[0579]

[0580] Polymerizable liquid crystal compound (2):

[0581] [Chemical Formula 16]

[0582]

[0583] As the dichroic dyes (1) to (3), azo dyes having the structures shown below were used.

[0584] ·Dichroic pigments (1)

[0585] [Chemical Formula 17]

[0586]

[0587] ·Dichroic pigments (2)

[0588] [Chemical Formula 18]

[0589]

[0590] ·Dichroic pigments (3)

[0591] [Chemical Formula 19]

[0592]

[0593] (Preparation of Liquid Crystal Polarizer Forming Composition (2))

[0594] The components shown below were mixed and stirred at 80° C. for 1 hour to obtain a composition (2) for forming a liquid crystal polarizer.

[0595] Polymerizable liquid crystal compound (1): 75 parts

[0596] Polymerizable liquid crystal compound (2): 25 parts

[0597] Dichroic pigment (azo pigment) (1): 2.8 parts

[0598] Dichroic pigment (azo pigment) (2): 2.8 parts

[0599] Dichroic pigment (azo pigment) (3): 2.8 parts

[0600] Polymerization initiator (2-dimethylamino-2-benzyl-1-(4-morpholinophenyl)butan-1-one (Irgacure 369, manufactured by BASF)): 6 parts

[0601] Leveling agent (polyacrylate compound (BYK-361N, manufactured by BYK-Chemie): 1.2 parts

[0602] Reactive additive (Laromer (registered trademark) LR-9000, manufactured by BASF): 2 parts

[0603] Solvent (cyclopentanone): 250 parts

[0604] The structures and synthesis methods of the polymerizable liquid crystal compounds (1) and (2) are as described above. The reactive additive includes a compound having the structure shown below.

[0605] [Chemical Formula 20]

[0606]

[0607] [Preparation of Composition for Forming Light Absorption Anisotropic Layer]

[0608] (Preparation of the composition for forming anisotropic light-absorbing layer (1))

[0609] The components shown below were mixed and stirred at 80° C. for 1 hour to obtain a composition (1) for forming a light-absorbing anisotropic layer.

[0610] Polymerizable liquid crystal compound (1): 75 parts

[0611] Polymerizable liquid crystal compound (2): 25 parts

[0612] Dichroic pigment (azo pigment) (4): 1.2 parts

[0613] Dichroic pigment (azo pigment) (5): 1.7 parts

[0614] Polymerization initiator (2-dimethylamino-2-benzyl-1-(4-morpholinophenyl)butan-1-one (Irgacure 369, manufactured by BASF): 6 parts

[0615] Leveling agent (MEGAFACE F-556, manufactured by DIC Corporation): 0.25 parts

[0616] Solvent (o-xylene): 670 parts

[0617] The structures and synthesis methods of the polymerizable liquid crystal compounds (1) and (2) are as described above.

[0618] As the dichroic dyes (4) and (5), azo dyes having the following structures were used.

[0619] Dichroic pigments (4):

[0620] [Chemical Formula 21]

[0621]

[0622] Dichroic pigments (5):

[0623] [Chemical Formula 22]

[0624]

[0625] (Preparation of Composition (2) for Forming Light Absorption Anisotropic Layer)

[0626] The components shown below were mixed and stirred at 80° C. for 1 hour to obtain a composition (2) for forming a light-absorbing anisotropic layer.

[0627] Polymerizable liquid crystal compound (1): 75 parts

[0628] Polymerizable liquid crystal compound (2): 25 parts

[0629] Dichroic pigment (azo pigment) (4): 1.2 parts

[0630] Dichroic pigment (azo pigment) (5): 1.7 parts

[0631] Polymerization initiator (2-dimethylamino-2-benzyl-1-(4-morpholinophenyl)butan-1-one (Irgacure 369, manufactured by BASF): 6 parts

[0632] Leveling agent (MEGAFACE F-556, manufactured by DIC Corporation): 0.25 parts

[0633] Non-liquid crystal compound having a polymerizable group (dipentaerythritol hexaacrylate (6-functional)): 1.5 parts

[0634] Reactive additive (Laromer (registered trademark) LR-9000, manufactured by BASF): 2 parts

[0635] Solvent (o-xylene): 670 parts

[0636] The structures and synthesis methods of the polymerizable liquid crystal compounds (1) and (2), the structures of the dichroic dyes (4) and (5), and the structure of the reactive additive are as described above.

[0637] [Preparation of Protective Layer-Forming Composition]

[0638] (Preparation of Resin Composition Containing Water-Soluble Polymer)

[0639] To 100 parts of water were added 3 parts of carboxyl-modified polyvinyl alcohol (KURARAY POVAL KL318, manufactured by KURARAY) and 1.5 parts of a water-soluble polyamide epoxy resin (Sumirez resin 650 (aqueous solution having a solid content concentration of 30%), manufactured by Sumika Chemtex) to prepare a resin composition containing a water-soluble polymer.

[0640] (Preparation of Hard Coat Composition)

[0641] The following components were mixed and stirred at 80° C. for 1 hour to prepare a hard coating composition.

[0642] Acrylate compound (dipentaerythritol hexaacrylate): 50 parts

[0643] Urethane acrylate compound (urethane acrylate (manufactured by DAICEL Allnex Co., Ltd., "EBECRYL 4858")): 50 parts

[0644] Radical polymerization initiator (2-[4-(methylthio)benzoyl]-2-(4-morpholinyl)propane (manufactured by BASF, "Irgacure 907")): 3 parts

[0645] Solvent (methyl ethyl ketone): 10 parts

[0646] (Preparation of Photocurable Compositions (1) to (6))

[0647] After mixing a cationic polymerizable compound (monomers (A-1) to (A-6)) and a cationic polymerization initiator in the amounts shown in Table 1, degassing was performed to prepare photocurable compositions (1) to (6). In Table 1, the amounts of the cationic polymerizable compound and the cationic polymerization initiator are expressed in parts by mass. Monomers (A-1) to (A-6) and the cationic polymerization initiator (B) are the components shown below, respectively. The cationic polymerization initiator (B) was added in the form of a 50% by mass propylene carbonate solution, and its solid content is shown in Table 1.

[0648] (Cationically polymerizable compound)

[0649] A-1: 3',4'-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate (manufactured by Daicel Corporation, "CEL2021P")

[0650] A-2: 1,6-Hexanediol diglycidyl ether (manufactured by Nagase Chemtex Co., Ltd., "EX-212L")

[0651] A-3: 4-Hydroxybutyl vinyl ether (manufactured by Maruzen Petrochemical Co., Ltd., "HBVE")

[0652] A-4: p-tert-Butylphenyl glycidyl ether (manufactured by Nagase Chemtex Co., Ltd., "EX-146")

[0653] A-5: Bisphenol F epoxy resin (DIC Corporation, "EXA-830CRP")

[0654] A-6: 2-Ethylhexyl glycidyl ether (manufactured by Nagase Chemtex Co., Ltd., “EX-121”)

[0655] (Cationic polymerization initiator)

[0656] B: Cationic polymerization initiator (50% by mass solution) (manufactured by San-Apro Co., Ltd., "CPI-100P")

[0657] [Table 1]

[0658]

[0659] [Preparation of Adhesive Layer]

[0660] As the adhesive layer, a 20 μm-thick acrylic pressure-sensitive adhesive (manufactured by LINTEC) was prepared.

[0661] [Example 1]

[0662] (Manufacturing of Liquid Crystal Polarizer (1))

[0663] The horizontal alignment layer forming composition (2) was applied onto the substrate layer (1) (TAC film) using a bar coater, dried at 80°C for 1 minute, and irradiated with a polarized UV light apparatus (SPOT CURE SP-7 with a polarizer unit; manufactured by USHIO INC.) at a rate of 100 mJ / cm 2 Polarized UV light exposure was performed with an accumulated light intensity of , to form a horizontal alignment layer (1). The thickness of the obtained horizontal alignment layer (1) was measured using an ellipsometer M-220 (manufactured by JASCO Corporation) and found to be 40 nm.

[0664] The liquid crystal polarizer forming composition (2) was applied onto the horizontal alignment layer (1) using a bar coater and then dried in a drying oven set at 120°C for 1 minute. Then, ultraviolet light (under nitrogen atmosphere, wavelength: 365 nm, cumulative light intensity at wavelength 365 nm: 1000 mJ / cm) was irradiated using a high-pressure mercury lamp (Unicure VB-15201BY-A, manufactured by USHIOINC.). 2 ), thereby forming a liquid crystal polarizer (1) in which the polymerizable liquid crystal compound and the dichroic pigment are horizontally oriented. The thickness of the liquid crystal polarizer (1) was measured using an ellipsometer and found to be 2.0 μm.

[0665] The surface of the liquid crystal polarizer (1) opposite to the horizontal alignment layer (1) was subjected to a single corona treatment using a corona treatment apparatus (AGF-B10, manufactured by Kasuga Electric Co., Ltd.) at an output of 0.3 kW and a treatment speed of 3 m / min. A resin composition containing a water-soluble polymer was applied to the corona-treated surface of the liquid crystal polarizer (1) using a bar coater and dried at 100° C. for 2 minutes to form a first protective layer (1) having a thickness of 1 μm.

[0666] (Production of optical layered body (1))

[0667] The surface of the first protective layer (1) opposite to the liquid crystal polarizer (1) was subjected to a corona treatment using a corona treatment device (AGF-B10, manufactured by Kasuga Electric Co., Ltd.) at an output of 0.3 kW and a treatment speed of 3 m / min. The light absorption anisotropic layer-forming composition (2) was applied to the corona-treated surface of the first protective layer (1) using a bar coater, and then dried in a drying oven set at 100° C. for 1 minute. Subsequently, ultraviolet rays (under a nitrogen atmosphere, wavelength: 365 nm, cumulative light intensity at a wavelength of 365 nm: 500 mJ / cm) were irradiated using a high-pressure mercury lamp (Unicure VB-15201BY-A, manufactured by USHIO INC.). 2 ), thereby forming a light absorption anisotropic layer (1) containing a polymer of a polymerizable liquid crystal compound and a dichroic pigment. In the light absorption anisotropic layer (1), the polymerizable liquid crystal compound and the dichroic pigment are vertically oriented relative to the coating plane. The thickness of the light absorption anisotropic layer (1) was measured using an ellipsometer M-220 (manufactured by JASCO Corporation) and was found to be 0.9 μm.

[0668] The surface of the light-absorbing anisotropic layer (1) opposite to the first protective layer (1) was subjected to a single corona treatment using a corona treatment apparatus (AGF-B10, manufactured by Kasuga Electric Co., Ltd.) at an output of 0.3 kW and a treatment speed of 3 m / min. A resin composition containing a water-soluble polymer was applied to the corona-treated surface of the light-absorbing anisotropic layer (1) using a bar coater and dried at 100°C for 2 minutes to form a third protective layer (1) having a thickness of 1 μm. Thus, an optical laminate (1) having a layer structure of substrate layer (1) / horizontal alignment layer (1) / liquid crystal polarizer (1) / first protective layer (1) / light-absorbing anisotropic layer (1) / third protective layer (1) was obtained.

[0669] [Example 2]

[0670] A resin composition containing a water-soluble polymer was applied to the release-treated surface of the substrate layer (2) (a release-treated PET film) using a bar coater and dried at 100°C for 2 minutes to form a second protective layer (1) having a thickness of 1 μm. The surface of the second protective layer (1) opposite to the substrate layer (2) was subjected to a single corona treatment using a corona treatment apparatus (AGF-B10, manufactured by Kasuga Electric Co., Ltd.) at an output of 0.3 kW and a treatment speed of 3 m / min.

[0671] An optical laminate (2) was obtained by the same procedure as in Example 1 except that the horizontal alignment layer-forming composition (2) was applied to the corona-treated surface of the second protective layer (1) formed on the substrate layer (2) instead of the substrate layer (1). The layer structure of the optical laminate (2) was substrate layer (2) / second protective layer (1) / horizontal alignment layer (1) / liquid crystal polarizer (1) / first protective layer (1) / light absorption anisotropic layer (1) / third protective layer (1).

[0672] [Example 3]

[0673] The hard coating composition was applied to the release-treated surface of the substrate layer (2) (a release-treated PET film) using a bar coater, dried at 80°C for 1 minute, and irradiated with ultraviolet light (under a nitrogen atmosphere, wavelength: 365 nm, cumulative light intensity at a wavelength of 365 nm: 500 mJ / cm) using a high-pressure mercury lamp (Unicure VB-15201BY-A, manufactured by USHIO INC.). 2 ), thereby forming a second protective layer (2) (thickness: about 3 μm) as a hard coat layer. A liquid crystal polarizer (1) was formed in the same manner as in Example 2 except that a horizontal alignment layer (1) was formed on the second protective layer (2) formed on the substrate layer (2) instead of the second protective layer (1) formed on the substrate layer (2).

[0674] The surface of the liquid crystal polarizer (1) opposite to the horizontal alignment layer (1) was subjected to a corona treatment once using a corona treatment apparatus (AGF-B10, manufactured by Kasuga Electric Co., Ltd.) at an output of 0.3 kW and a treatment speed of 3 m / min. A hard coating composition was applied to the corona-treated surface of the liquid crystal polarizer (1) using a bar coater, dried at 80°C for 1 minute, and irradiated with ultraviolet light (under a nitrogen atmosphere, wavelength: 365 nm, cumulative light intensity at a wavelength of 365 nm: 500 mJ / cm) using a high-pressure mercury lamp (Unicure VB-15201BY-A, manufactured by USHIO INC.). 2 ), thereby forming a first protective layer (2) (thickness: about 3 μm) as a hard coat layer.

[0675] An optical laminate (3) was obtained by the same procedure as in Example 2 except that the light absorption anisotropic layer (1) was formed on the first protective layer (2) instead of on the first protective layer (1). The layer structure of the optical laminate (3) was substrate layer (2) / second protective layer (2) / horizontal alignment layer (1) / liquid crystal polarizer (1) / first protective layer (2) / light absorption anisotropic layer (1) / third protective layer (1).

[0676] [Example 4]

[0677] An optical layered product (4) was obtained in the same manner as in Example 2 except that the composition (1) for forming an anisotropic light-absorbing layer was used instead of the composition (2) for forming an anisotropic light-absorbing layer. The layer structure of the optical layered product (4) was: substrate layer (2) / second protective layer (1) / horizontal alignment layer (1) / liquid crystal polarizer (1) / first protective layer (1) / light anisotropic light-absorbing layer (2) / third protective layer (1).

[0678] [Example 5]

[0679] An optical laminate (5) was obtained in the same manner as in Example 2 except that the substrate layer (3) (saponified TAC film) was used instead of the substrate layer (2). The layer structure of the optical laminate (5) was substrate layer (3) / second protective layer (1) / horizontal alignment layer (1) / liquid crystal polarizer (1) / first protective layer (1) / light absorption anisotropic layer (1) / third protective layer (1).

[0680] [Examples 6 to 11]

[0681] Optical layered bodies (6) to (11) were obtained in the same manner as in Example 3 except that the photocurable compositions (1) to (6) described in Table 1 were used in place of the hard coat composition to form the first protective layers (3) to (8).

[0682] [Comparative Example 1]

[0683] (Preparation of Liquid Crystal Polarizer (c1) with Substrate Layer)

[0684] The substrate layer (1) (TAC film) was subjected to a corona treatment once using a corona treatment apparatus (AGF-B10, manufactured by Kasuga Electric Co., Ltd.) at an output of 0.3 kW and a treatment speed of 3 m / min. The horizontal alignment layer forming composition (2) was applied to the corona treated surface of the substrate layer (1) using a bar coater, dried at 80°C for 1 minute, and then irradiated with a polarized UV light apparatus (SPOT CURE SP-7 with a polarizer unit; manufactured by USHIO INC.) at a radiation intensity of 100 mJ / cm 2 Polarized UV light exposure was performed with an accumulated light amount of , to form a horizontal alignment layer (2). The thickness of the obtained horizontal alignment layer (2) was measured using an ellipsometer M-220 (manufactured by JASCO Corporation) and found to be 40 nm.

[0685] A liquid crystal polarizer (c1) with a substrate layer was formed by following the same procedures as in Example 1 except that the composition (2) for forming a liquid crystal polarizer was applied on the horizontal alignment layer (2) formed on the substrate layer (1) instead of applying the composition (2) for forming a liquid crystal polarizer on the horizontal alignment layer (1) formed on the substrate layer (1). The layer structure of the liquid crystal polarizer (c1) with a substrate layer was substrate layer (1) / horizontal alignment layer (2) / liquid crystal polarizer (2) / first protective layer (1).

[0686] (Preparation of the Light Absorption Anisotropic Layer (c1) with a Film Substrate)

[0687] The substrate layer (1) was subjected to a corona treatment according to the steps described in the preparation of the liquid crystal polarizer (c1) with a substrate layer. The substrate layer (1) was used as a film substrate, and a hard coating composition was applied to the corona-treated surface of the film substrate using a bar coater. The hard coating composition was dried at 80°C for 1 minute, and then irradiated with ultraviolet light (under a nitrogen atmosphere, wavelength: 365 nm, cumulative light intensity at a wavelength of 365 nm: 500 mJ / cm) using a high-pressure mercury lamp (Unicure VB-15201BY-A, manufactured by USHIO INC.). 2 ), thereby forming a hard coating layer (hereinafter also referred to as "HC layer") (thickness: about 3 μm).

[0688] A light-absorbing anisotropic layer (2) was formed in the same manner as in Example 4, except that the light-absorbing anisotropic layer-forming composition (1) was applied on the HC layer instead of on the corona-treated surface of the first protective layer (1).

[0689] The surface of the light-absorbing anisotropic layer (2) opposite to the HC layer was subjected to a corona treatment once using a corona treatment apparatus (AGF-B10, manufactured by Kasuga Electric Co., Ltd.) at an output of 0.3 kW and a treatment speed of 3 m / min. The hard coating composition was applied to the corona-treated surface of the light-absorbing anisotropic layer (1) using a bar coater, dried at 80°C for 1 minute, and irradiated with ultraviolet light (under a nitrogen atmosphere, wavelength: 365 nm, cumulative light intensity at a wavelength of 365 nm: 500 mJ / cm) using a high-pressure mercury lamp (Unicure VB-15201BY-A, manufactured by USHIO INC.). 2 ) to form a HC layer (thickness: about 3 μm). Thus, a light-absorbing anisotropic layer (c1) with a film substrate having a layer structure of film substrate (1) (substrate layer (1)) / HC layer / light-absorbing anisotropic layer (2) / HC layer was obtained.

[0690] (Production of optical layered body (c1))

[0691] The first protective layer (1) side of the liquid crystal polarizer (c1) with a substrate layer and the HC layer side of the light absorption anisotropic layer (c1) with a film substrate were subjected to a corona treatment apparatus (AGF-B10, manufactured by Kasuga Electric Co., Ltd.) under the conditions of an output of 0.3 kW and a treatment speed of 3 m / min. Then, the adhesive layer prepared above was laminated on the first protective layer (1), and the HC layer side of the light absorption anisotropic layer (c1) with a film substrate was laminated on the adhesive layer to obtain an optical laminate (c1). The layer structure of the optical laminate (c1) was substrate layer (1) / horizontal alignment layer (2) / liquid crystal polarizer (2) / first protective layer (1) / adhesive layer / HC layer / light absorption anisotropic layer (2) / HC layer / film substrate (1) (substrate layer (1)).

[0692] [Comparative Example 2]

[0693] (Preparation of Liquid Crystal Polarizer (c2) with Substrate Layer)

[0694] The same procedures as in Example 3 were followed to form an HC layer on the substrate layer (2), and the HC layer was subjected to a corona treatment. The same procedures as in Comparative Example 1 were followed, except that the corona-treated surface of the HC layer formed on the substrate layer (2) was coated with the horizontal alignment layer-forming composition (1) instead of the corona-treated surface of the substrate layer (1). A liquid crystal polarizer (c2) with a substrate layer was obtained. The layer structure of the liquid crystal polarizer (c2) with a substrate layer was substrate layer (2) / HC layer / horizontal alignment layer (2) / liquid crystal polarizer (2) / first protective layer (1).

[0695] (Preparation of the Light Absorption Anisotropic Layer (c1) with a Film Substrate)

[0696] A light-absorbing anisotropic layer (c2) with a film substrate was obtained by the same procedure as in Comparative Example 1 except that a base layer (2) was used instead of the base layer (1) as a film substrate, and the release-treated surface of the base layer (2) was subjected to a corona treatment to form an HC layer. The layer structure of the light-absorbing anisotropic layer (c2) with a film substrate was film substrate (2) (base layer (2)) / HC layer / light-absorbing anisotropic layer (2) / HC layer.

[0697] (Production of optical layered body (c2))

[0698] An optical layered product (c2) was obtained in the same manner as in Comparative Example 1 except that a liquid crystal polarizer (c2) with a substrate layer was used instead of the liquid crystal polarizer (c1) with a substrate layer, and a light absorption anisotropic layer (c2) with a film substrate was used instead of the light absorption anisotropic layer (c1) with a film substrate. The layer structure of the optical layered product (c2) was: substrate layer (2) / HC layer / horizontal alignment layer (2) / liquid crystal polarizer (2) / first protective layer (1) / adhesive layer / HC layer / light absorption anisotropic layer (2) / HC layer / film substrate (2) (substrate layer (2)).

[0699] [Comparative Example 3]

[0700] An optical laminate (c3) was obtained by the same procedure as in Example 2 except that the light absorption anisotropic layer (1) was formed on the liquid crystal polarizer (1) instead of the first protective layer (1). The layer structure of the optical laminate (c3) was substrate layer (2) / second protective layer (1) / horizontal alignment layer (1) / liquid crystal polarizer (1) / light absorption anisotropic layer (1) / third protective layer (1).

[0701] [Measurement of Absorbance of Light Absorption Anisotropic Layer]

[0702] A light-absorbing anisotropic layer was formed on a substrate layer (1) (TAC film) by the procedures described in the Examples and Comparative Examples. The light-absorbing anisotropic layer was then bonded to a 4 cm × 4 cm × 0.7 mm thick glass sheet via the adhesive layer prepared above. This was used as a measurement sample (1). The measurement sample (1) was placed in an ultraviolet-visible spectrophotometer ("UV-2450" manufactured by Shimadzu Corporation) and its absorbance was measured. Ax at the maximum absorption wavelength within the wavelength range of 380 nm to 780 nm was determined. Furthermore, for the measurement sample (1), the absorbance Ax (z=60) at the maximum absorption wavelength within the wavelength range of 380 nm to 780 nm was determined when the light-absorbing anisotropic layer was rotated 60° about the y-axis using the ultraviolet-visible spectrophotometer. Since the absorbance of the substrate layer can be regarded as 0 (zero), Ax and Ax(z=60) measured for the measurement sample (1) can be regarded as the absorbance of the light absorption anisotropic layer.

[0703] The x-axis refers to an arbitrary direction in the plane of the light absorption anisotropic layer, the y-axis refers to the direction perpendicular to the x-axis in the plane of the film, and the z-axis refers to the thickness direction of the light absorption anisotropic layer. Ax is the absorbance at the maximum absorption wavelength of the light absorption anisotropic layer, and represents the absorbance of linearly polarized light vibrating in the x-axis direction. Ax(z = 60) is the absorbance at the maximum absorption wavelength when the light absorption anisotropic layer is rotated 60° around the y-axis, and represents the absorbance of linearly polarized light vibrating in the x-axis direction.

[0704] When measuring the absorbance, the measurement sample (1) is set in an ultraviolet-visible spectrophotometer ("UV-2450" manufactured by Shimadzu Corporation). After calibration so that the absorbance at a wavelength of 800 nm becomes zero, Ax is measured. Regarding Ax(z = 60), similarly, after setting and tilting the measurement sample (1), and after calibration so that the absorbance at a wavelength of 800 nm becomes zero, Ax(z = 60) is measured. Regarding the absorbance described next, after calibration by the same procedure, the absorbance is measured.

[0705] The satisfaction of the relationship (Az > (Ax + Ay) / 2) of the above formula (1) for the light absorption anisotropic layer is judged by the following steps.

[0706] In a state where the measurement sample (1) is rotated 30° and 60° in a manner that includes the y-axis, the same linearly polarized light as when measuring Ax is incident, thereby measuring Ax(z = 30°) and Ax(z = 60°). Similarly, in a state where the measurement sample (1) is rotated at 30° and 60° in a manner that includes the x-axis, the same linearly polarized light as when measuring Ay is incident, thereby measuring Ay(z = 30°) and Ay(z = 60°).

[0707] In the case where there is no absorption anisotropy in the x-y plane, that is, when Ax and Ay are equal, Ax(z = 30°) = Ay(z = 30°) and Ax(z = 60°) = Ay(z = 60°). Therefore, Ax(z = 30°) and Ay(z = 30°) are denoted as A(z = 30°), Ax(z = 60°) and Ay(z = 60°) are denoted as A(z = 60°), and Ax(z = 90°) and Ay(z = 90°) are denoted as A(z = 90°).

[0708] In the case where the relationship of A(z = 30°) < A(z = 60°) holds, the relationship of A(z = 30°) < A(z = 60°) < A(z = 90°) = Az holds. Therefore, if A(z = 30°) > (Ax + Ay) / 2 or A(z = 60°) > (Ax + Ay) / 2, it is judged that the relationship of the above formula (1) is satisfied. The results are shown in Tables 2 to 4.

[0709] [Measurement of the Refractive Index of the First Protective Layer and the Second Protective Layer]

[0710] The refractive index of the first protective layer (3) to (8) formed using the photocurable compositions (1) to (6) shown in Table 1 and the refractive index of the second protective layer (2) formed using the hard coating composition were measured by the following procedure. The photocurable compositions (1) to (6) and the hard coating composition shown in Table 1 were applied to one side of a cycloolefin polymer (COP) film (Zeon Co., Ltd., "ZF-14") using a bar coater (manufactured by Daiichi Rika Co., Ltd.) and an ultraviolet irradiation device (manufactured by Fusion UV Systems Co., Ltd.) was used to irradiate the film at a cumulative dose of 500 mJ / cm 2 The COP film was irradiated with ultraviolet light in a manner to form a cured layer on the COP film. The thickness of the COP film and the cured layer was measured using a contact thickness meter, and the thickness of the cured layer was calculated by subtracting the thickness of the COP film. The result was about 30 μm. The COP film on the cured layer was peeled off, and the three-dimensional refractive index of the cured layer at 589 nm was measured using a multi-wavelength Abbe refractometer (manufactured by ATAGO Co., Ltd., "DR-M4") at a temperature of 25°C. The refractive index in the direction parallel to the transmission axis direction of the liquid crystal polarizer (1) among the three-dimensional refractive indices measured for the cured layer was taken as the refractive index of the cured layer. It should be noted that the first protective layer (3) to (8) and the second protective layer (2) do not have orientation in the plane, so the refractive index in the direction parallel to the transmission axis direction of the liquid crystal polarizer (1) and the refractive index in the direction parallel to the absorption axis direction become the same value. The results are shown in Table 3.

[0711] [Measurement of the Refractive Index of the Third Protective Layer]

[0712] The refractive index of the third protective layer (1) formed using a resin composition containing a water-soluble polymer was measured by the following steps. The resin composition containing a water-soluble polymer was applied to one side of a cycloolefin polymer (COP) film (Zeon Co., Ltd., "ZF-14") using a rod coater (manufactured by Daiichi Rika Co., Ltd.) and dried at 100°C for 2 minutes to form a third protective layer (1) having a thickness of 1 μm. The COP film on the third protective layer (1) was peeled off, and the three-dimensional refractive index of the protective layer at 589 nm was measured using a multi-wavelength Abbe refractometer (manufactured by ATAGO Co., Ltd., "DR-M4") at a temperature of 25°C. The refractive index in the direction parallel to the transmission axis direction of the liquid crystal polarizer (1) among the three-dimensional refractive indices measured for the third protective layer (1) was taken as the refractive index of the third protective layer (1). It should be noted that the third protective layer (1) has no in-plane orientation, so the refractive index in the direction parallel to the transmission axis and the refractive index in the direction parallel to the absorption axis of the liquid crystal polarizer (1) are the same value. The results are shown in Table 3.

[0713] [Measurement of Refractive Index of Horizontal Alignment Layer]

[0714] Instead of the substrate layer (1), a cycloolefin polymer (COP) film (manufactured by Zeon (Japan), "ZF-14") was used. In addition, a laminated body in which the COP film and the horizontal alignment layer were laminated was obtained by the production step of the horizontal alignment layer described in Example 1. Glass was bonded to the horizontal alignment liquid crystal solidification layer side of the laminate via an adhesive layer to obtain a measurement sample (m1). It was confirmed that the COP film had no phase difference, and the three-dimensional refractive index of the measurement sample (m1) at 589 nm was calculated using an ellipsometer. The refractive index in the direction parallel to the transmission axis direction of the liquid crystal polarizer (1) among the three-dimensional refractive indices calculated for the horizontal alignment layer was used as the refractive index of the horizontal alignment layer. The results are shown in Table 3.

[0715] [Measurement of the refractive index of liquid crystal polarizer (1)]

[0716] A cycloolefin polymer (COP) film (manufactured by Zeon Japan, "ZF-14") was used instead of the substrate layer (1), and a composition obtained by removing a dichroic pigment and a reactive additive from the composition (2) for forming a liquid crystal polarizer was used instead of the composition for forming a liquid crystal polarizer. In addition, a laminate having a horizontal alignment layer and a horizontal alignment liquid crystal solidification layer in sequence on the COP film was obtained by the production steps of the liquid crystal polarizer (1) described in Example 1. Glass was bonded to the horizontal alignment liquid crystal solidification layer side of the laminate via an adhesive layer, and the COP film and the horizontal alignment layer were peeled off to obtain a sample for measurement (m2). It was confirmed that the COP film had no phase difference, and the three-dimensional refractive index of the sample for measurement (m2) at 589 nm was calculated using an ellipsometer. The refractive index in the direction parallel to the transmission axis direction of the liquid crystal polarizer (1) among the three-dimensional refractive indices calculated for the horizontal alignment liquid crystal solidification layer was used as the refractive index of the liquid crystal polarizer (1). The results are shown in Table 3. The refractive index of the horizontally aligned liquid crystal solidified layer in the thickness direction was 1.53.

[0717] [Measurement of the refractive index of the light absorption anisotropic layer (1)]

[0718] Instead of the composition (2) for forming an anisotropic light-absorbing layer, a composition obtained by removing a dichroic pigment from the composition (2) for forming an anisotropic light-absorbing layer was used, and the composition was applied to a cycloolefin polymer (COP) film (manufactured by Zeon (Japan), "ZF-14") instead of the first protective layer (1). Furthermore, the steps for preparing the anisotropic light-absorbing layer (1) described in Example 1 were followed to obtain a laminated body in which a COP film and a vertically aligned liquid crystal solidified layer were laminated. A glass was bonded to the vertically aligned liquid crystal solidified layer side of the laminated body via an adhesive layer to obtain a sample (m3) for measurement. After confirming that the COP film had no phase difference, an ellipsometer was used to change the angle of incidence of light on the sample (m3) for measurement, measure the phase difference, and measure the average refractive index. The three-dimensional refractive index at 589 nm was calculated from the measured phase difference value, the average refractive index, and the thickness of the vertically aligned liquid crystal solidified layer. It should be noted that the phase difference value R0 on the front of the vertically aligned liquid crystal solidification layer is R0(550)=1.3nm, the phase difference value R40 when the vertically aligned liquid crystal solidification layer is tilted 40° around the fast axis is R40(550)=21.9nm, and the phase difference value Rth in the thickness direction of the vertically aligned liquid crystal solidification layer is Rth(450)=-91nm, Rth(550)=-84nm, and Rth(450) / Rth(550)=1.09. The numerical values ​​in brackets represent the measurement wavelength [nm]. The refractive index in the direction parallel to the transmission axis direction in the liquid crystal polarizer (1) among the three-dimensional refractive indices obtained for the vertically aligned liquid crystal solidification layer is taken as the refractive index of the light absorption anisotropic layer (1). The results are shown in Table 3. It should be noted that the refractive index in the thickness direction of the vertically aligned liquid crystal solidification layer is 1.66.

[0719] [Calculation of front transmittance]

[0720] For the laminates obtained by peeling the substrate layer (2) from the optical laminates prepared in Examples 6 to 11, the front transmittance [%] of linearly polarized light having a vibration plane in the transmission axis direction of the liquid crystal polarizer was calculated. The front transmittance was calculated based on the reflectance R obtained using the following Fresnel formula (F1), assuming that the light absorption in the visible region in each layer was zero, using the refractive indices of the first protective layer, the second protective layer, the third protective layer, the horizontal alignment layer, the liquid crystal polarizer (1) (horizontally aligned liquid crystal solidified layer), and the light absorption anisotropic layer (1) (vertically aligned liquid crystal solidified layer) calculated in the above manner. Specifically, [i] for each layer constituting the laminate, the reflectance R of the two interfaces in the stacking direction of the laminate was calculated based on the following formula (F1); [ii] starting from the layer on the light incident side of the laminate (the third protective layer side), the reflectance calculated in [i] was used to calculate the transmittance of each layer in order to calculate the front transmittance of the laminate. The calculation of the transmittance of each layer calculated by [ii] above is performed according to the following steps. First, the transmittance (1) of the third protective layer, which is the layer on the light incident side of the above-mentioned laminate, is the value obtained by subtracting the reflectance of the two interfaces of the third protective layer (the interface with the air layer and the light-absorbing anisotropic layer) from the intensity of the incident light on the third protective layer. Next, the transmittance (2) of the light-absorbing anisotropic layer adjacent to the third protective layer is the following value: the transmittance (1) of the third protective layer is used as the intensity of the incident light on the light-absorbing anisotropic layer, and the reflectance of the two interfaces of the light-absorbing anisotropic layer (the interface with the third protective layer and the first protective layer) is subtracted from the transmittance (1). This transmittance calculation method is repeated for each layer constituting the above-mentioned laminate, thereby calculating the front transmittance of the above-mentioned laminate. The second and third protective layers located on the surface (outer surface) of the laminate had interfaces between the surface side of the optical laminate and an air layer, and the refractive index of the air layer was set to 1.0.

[0721] R = [(n1-n2) / (n1+n2)] 2 (F1)

[0722] [In formula (F1),

[0723] R represents the reflectivity at the interface between adjacently stacked medium 1 and medium 2.

[0724] n1 represents the refractive index of medium 1,

[0725] n2 represents the refractive index of medium 2.]

[0726] [Evaluation of Processability of Optical Laminated Body]

[0727] When producing the optical layered body, the number of lamination steps for laminating the layers together using the pressure-sensitive adhesive layer was counted and evaluated based on the following criteria. The results are shown in Tables 2 to 4.

[0728] (Evaluation Criteria)

[0729] A: The number of laminations is 0.

[0730] B: The number of laminations is 1 or more.

[0731] [Evaluation of optical properties]

[0732] The laminated structure of the light absorption anisotropic layer and the liquid crystal polarizer in the optical laminate was attached to a 4 cm × 4 cm glass via the adhesive layer prepared above, and used as a measurement sample (2). The measurement sample (2) was arranged on the linear polarizer arranged on the backlight so that the liquid crystal polarizer in the measurement sample (2) formed orthogonal Nicols and the light absorption anisotropic layer in the measurement sample (2) was located outside the orthogonal Nicols. The measurement sample (2) was observed. The results of the observation were evaluated according to the following criteria. The results are shown in Tables 2 to 4.

[0733] (Evaluation Criteria)

[0734] A: Black, no light leakage can be felt.

[0735] B: Light leakage is felt partially or entirely.

[0736] [Evaluation of Adhesion of Optical Layered Body]

[0737] (Evaluation of peelability of substrate layer)

[0738] The optical laminate was cut into a size of 160 mm × 80 mm. The cut optical laminate was fixed in a manner such that the third protective layer side of the optical laminates (1) to (5) and (c3) and the film substrate side of the optical laminates (c1) and (c2) faced downward, and the peeling property of the substrate layer was evaluated by hand in one go. The peeling property evaluation was performed on 5 sheets of each optical laminate, and the appearance of the transferred laminated portion obtained by peeling the substrate layer from the optical laminate was observed. For the 5 optical laminates provided for the peeling property evaluation, the observation results were evaluated according to the following criteria based on the ratio of the optical laminates that could peel off the substrate layer and did not produce floating and cracking in the transferred laminated portion. The results are shown in Tables 2 to 4.

[0739] (Evaluation Criteria)

[0740] A: 90% or more of the optical laminates were capable of peeling the substrate layer and had no lifting or cracking in the transferred laminated portion.

[0741] B: The percentage of the optical laminated body in which the base material layer can be peeled without causing floating or cracking in the transferred laminated portion is 30% or more and less than 90%.

[0742] C: Less than 30% of the optical laminates were capable of peeling the substrate layer without causing lifting or cracking in the transferred laminated portion.

[0743] (180° peel test)

[0744] In the measurement of peel forces F0 to F5 described below, the peel forces were measured by conducting a 180° peel test using a tensile testing machine in an atmosphere of 23°C and 60% relative humidity. In the 180° peel test, Cellotape (registered trademark) manufactured by Nichiban was attached as a peeling guide tape to the back surface of the optical laminate or the transferred laminate portion obtained by peeling the substrate layer from the optical laminate (each having a width of 25 mm and a length of approximately 150 mm). The peeling guide tape was clamped between one longitudinal end of the optical laminate or the transferred laminate portion using the clamps of the tensile testing machine. The test was conducted in accordance with the procedures of JIS K 6854-2:1999 "Adhesives - Test Methods for Peel Adhesion Strength - Part 2: 180° Peel."

[0745] (Measurement of Peel Force F0 (Peel Force Between Base Layer and Horizontal Alignment Layer or Second Protective Layer))

[0746] The optical laminate was cut into a size of 25 mm in width and about 150 mm in length. A glass with a thickness of 0.7 mm was bonded to the third protective layer side of the cut optical laminates (1) to (5) and (c3), and the film substrate side of the optical laminates (c1) and (c2) via the adhesive layer prepared above, and used as a measurement sample (3). The same peeling guide tape as above (Cellotape made by NICHIBAN) was installed on the back side of the substrate layer side of the optical laminate bonded to the glass, and a 180° peeling test was performed in which the peeling guide tape was grasped and the substrate layer was peeled off. The obtained peeling force was taken as F0. In the case of peeling the peeling guide tape in a manner that does not cause interlayer peeling in the optical laminate, a peeling force of 0.3 N / 25 mm or more is required. Therefore, in the case of peeling only the peeling guide tape, it is judged to be 0.6 N / 25 mm or more.

[0747] (Measurement of peeling forces F1 to F5)

[0748] Peel force F1 is the peel force between the horizontal alignment layer and the liquid crystal polarizer. Peel force F2 is the peel force between the liquid crystal polarizer and the first protective layer. Peel force F3 is the peel force between the first protective layer and the light-absorbing anisotropic layer. Peel force F4 is the peel force between the light-absorbing anisotropic layer and the third protective layer. Peel force F5 is the peel force between the second protective layer and the horizontal alignment layer.

[0749] Using a measurement sample (3) having the peeling force F0 measured in the evaluation of the peelability of the substrate layer, the transferred laminate portion remaining on the glass after the substrate layer was peeled off (the surface exposed after the substrate layer was peeled off from the optical laminate) was subjected to a single corona treatment using a corona treatment apparatus (AGF-B10, manufactured by Kasuga Electric Co., Ltd.) at an output of 0.3 kW and a treatment speed of 3 m / min. The same peeling guide tape (Cellotape manufactured by Nichiban) as above was attached to the corona-treated surface, and this was used as a measurement sample (4). The peeling guide tape of the measurement sample (4) was grasped and a 180° peel test was performed.

[0750] In the 180° peel test of the measurement sample (4), if peeling occurred between any one of the layers of the transferred laminated portion of the measurement sample (4), the value of the measurement result was used as the peeling force between the layers where peeling occurred. If peeling occurred between two or more layers, the peeling force between the layers where peeling occurred was judged to be less than the value of the measurement result. When the peeling guide tape was peeled off in the 180° peel test of the measurement sample (4), the peeling forces F1 to F5 were all judged to be greater than 0.6 N / 25 mm based on the same reasons as explained in the measurement of the peeling force F0. The results are shown in Tables 2 to 4.

[0751] [Table 2]

[0752]

[0753] [Table 3]

[0754]

[0755] [Table 4]

[0756]

Claims

1. An optical laminate comprising a horizontal alignment layer, a liquid crystal polarizer, a first protective layer, and a light absorption anisotropic layer laminated in this order. The liquid crystal polarizer comprises a polymer of a polymerizable liquid crystal compound and a dichroic pigment, and has an absorption axis in a horizontal direction relative to the plane of the liquid crystal polarizer. The light absorption anisotropic layer comprises a polymer of a polymerizable liquid crystal compound and a dichroic pigment, and satisfies the following relationships (1) to (3): The horizontal alignment layer is directly connected to the liquid crystal polarizer. The liquid crystal polarizer is directly in contact with the first protective layer. The first protective layer is directly in contact with the light-absorbing anisotropic layer, or there is only a vertical alignment layer between the first protective layer and the light-absorbing anisotropic layer. Az>(Ax+Ay) / 2 (1) 0.001≤Ax≤0.1 (2) Ax(z=60°) / Ax≥5 (3) In formulas (1) to (3), Ax, Ay, and Az are the absorbances of the light absorption anisotropic layer at the maximum absorption wavelength within the wavelength range of 380 nm to 780 nm, and represent the absorbances of linearly polarized light vibrating along the x-axis, y-axis, and z-axis directions, respectively; Ax(z=60°) is the absorbance at the maximum absorption wavelength within the wavelength range of 380 nm to 780 nm when the light absorption anisotropic layer is rotated 60° about the y-axis, and represents the absorbance of linearly polarized light vibrating along the x-axis. in, The x-axis is any direction within the plane of the light-absorbing anisotropic layer. The y-axis is a direction orthogonal to the x-axis in the plane of the light-absorbing anisotropic layer. The z-axis is a direction perpendicular to the x-axis and the y-axis.

2. The optical laminate according to claim 1, wherein The horizontal alignment layer further comprises a substrate layer on the side opposite to the liquid crystal polarizer side. The base layer is in direct contact with the horizontal alignment layer, or only a second protective layer is provided between the base layer and the horizontal alignment layer.

3. The optical laminate according to claim 2, wherein When the peeling force between the substrate layer and the horizontal alignment layer when the substrate layer and the horizontal alignment layer are directly in contact, or the peeling force between the substrate layer and the second protective layer when only the second protective layer is provided is defined as F0, The peeling force F0 is 0.20 N / 25 mm or less.

4. The optical layered body according to claim 3, wherein The peeling force between the horizontal alignment layer and the liquid crystal polarizer is set to F1, The peeling force between the liquid crystal polarizer and the first protective layer is set to F2, When the peeling force between the first protective layer and the light-absorbing anisotropic layer is F3, The peeling forces F1 to F3 are all greater than the peeling force F0, and are each independently greater than 0.3 N / 25 mm. The optical layered body according to claim 4 , wherein: The light absorption anisotropic layer further comprises a third protective layer on the side opposite to the first protective layer. The light absorption anisotropic layer is in direct contact with the third protective layer. The optical layered body according to claim 5 , wherein: When the peeling force between the light absorption anisotropic layer and the third protective layer is defined as F4, the peeling force F4 is greater than the peeling force F0 and is greater than 0.3 N / 25 mm.

7. The optical layered body according to claim 3, wherein There is only the second protective layer between the base layer and the horizontal alignment layer, When the peeling force between the second protective layer and the horizontal alignment layer is defined as F5, the peeling force F5 is greater than the peeling force F0 and is greater than 0.3 N / 25 mm.

8. The optical layered body according to any one of claims 1 to 7, wherein The horizontal alignment layer further comprises a first liquid crystal retardation layer laminated via a first adhesive layer on the side opposite to the liquid crystal polarizer side. The first liquid crystal retardation layer includes a polymer of a polymerizable liquid crystal compound aligned in a horizontal direction with respect to a plane of the first liquid crystal retardation layer.

9. The optical layered body according to claim 8, wherein The horizontal alignment layer further includes a second liquid crystal retardation layer laminated via a second adhesive layer on the side opposite to the liquid crystal polarizer side. The second liquid crystal retardation layer includes a polymer of a polymerizable liquid crystal compound aligned in a vertical direction with respect to a plane of the second liquid crystal retardation layer.

10. The optical layered body according to any one of claims 1 to 7, wherein The dichroic pigment contained in the liquid crystal polarizer is an azo pigment, The dichroic dye contained in the light absorption anisotropic layer is an azo dye.

11. A method for producing an optical laminate, wherein the optical laminate is obtained by laminating a horizontal alignment layer, a liquid crystal polarizer, a first protective layer, and a light absorption anisotropic layer in this order. The liquid crystal polarizer comprises a polymer of a polymerizable liquid crystal compound and a dichroic pigment, and has an absorption axis in a horizontal direction relative to the plane of the liquid crystal polarizer. The light absorption anisotropic layer comprises a polymer of a polymerizable liquid crystal compound and a dichroic pigment, and satisfies the following relationships (1) to (3): The method for manufacturing the optical laminate comprises the following steps: A step of preparing a liquid crystal polarizer with a substrate layer, wherein the substrate layer, the horizontal alignment layer, and the liquid crystal polarizer are stacked in sequence, and the horizontal alignment layer is directly in contact with the liquid crystal polarizer; A step of directly coating a first protective layer-forming composition for forming the first protective layer on the liquid crystal polarizer with a substrate layer, thereby forming the first protective layer; and forming the light absorbing anisotropic layer directly on the first protective layer formed by the step of forming the first protective layer or forming the light absorbing anisotropic layer via a vertical alignment layer; The process of forming the light absorption anisotropic layer includes the following steps [a1] or [a2]: [a1] a step of directly coating a composition for forming a light-absorbing anisotropic layer, which is a composition for forming the light-absorbing anisotropic layer and contains a polymerizable liquid crystal compound and a dichroic dye, on the first protective layer; [a2] a step of directly coating a composition for forming a vertical alignment layer on the first protective layer, and a step of directly coating a composition for forming a light-absorbing anisotropic layer on the vertical alignment layer. Az>(Ax+Ay) / 2 (1) 0.001≤Ax≤0.1 (2) Ax(z=60°) / Ax≥5 (3) In formulas (1) to (3), Ax, Ay, and Az are the absorbances of the light absorption anisotropic layer at the maximum absorption wavelength within the wavelength range of 380 nm to 780 nm, and represent the absorbances of linearly polarized light vibrating along the x-axis, y-axis, and z-axis directions, respectively; Ax(z=60°) is the absorbance at the maximum absorption wavelength within the wavelength range of 380 nm to 780 nm when the light absorption anisotropic layer is rotated 60° about the y-axis, and represents the absorbance of linearly polarized light vibrating along the x-axis. in, The x-axis is any direction within the plane of the light-absorbing anisotropic layer. The y-axis is a direction orthogonal to the x-axis in the plane of the light-absorbing anisotropic layer. The z-axis is a direction perpendicular to the x-axis and the y-axis.

12. The method for producing an optical layered body according to claim 11, wherein: The process of preparing the liquid crystal polarizer with a substrate layer includes the following steps [b1] or [b2]: [b1] a step of directly coating a composition for forming a horizontal alignment layer for forming the horizontal alignment layer on the substrate layer, and a step of directly coating a composition for forming a liquid crystal polarizer containing a polymerizable liquid crystal compound and a dichroic dye as a composition for forming the liquid crystal polarizer on the horizontal alignment layer; [b2] A step of directly coating the composition for forming a horizontal alignment layer on a second protective layer formed in direct contact with the base layer, and a step of directly coating the composition for forming a liquid crystal polarizer on the horizontal alignment layer.

13. The method for producing an optical layered body according to claim 11, wherein: The optical layered body further includes a third protective layer on the side of the light absorption anisotropic layer opposite to the first protective layer. The manufacturing method further includes the step of directly applying a third protective layer-forming composition for forming the third protective layer onto a surface of the light-absorbing anisotropic layer opposite to the first protective layer.

14. The method for producing an optical layered body according to any one of claims 11 to 13, wherein: After the step of forming the light absorption anisotropic layer, the method further includes the step of peeling off the base material layer.

Images