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 that can be made thinner while simplifying a manufacturing process. [Solution] The optical laminate is obtained by laminating a base material layer, a light-absorbing anisotropic layer, a horizontal alignment layer, and a liquid crystal polarizer in this order. 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). 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. And the horizontal orientation layer is directly connected with the liquid crystal polaroid. The distance from the surface of the light-absorbing anisotropic layer on the base material layer side to the surface of the liquid crystal polarizer on the opposite side from the horizontal alignment layer side is 10 [mu] m or less. Azgt, Azgt; (Ax + Ay) / 2 (1); 0.001 < = A < = 0.1 (2); (3) Ax (z = 60 DEG) / Ax > = 5.

Description

Technical Field

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

[0002] In an organic EL (electroluminescent) display device, in order to reduce the hue difference between the front hue when viewed from the front and the oblique hue when viewed from an oblique direction when displaying white, it is known to use a laminate having a vertically aligned liquid crystal cured film (which is a cured product of a composition containing a polymerizable liquid crystal compound and a dichroic pigment) and a horizontally aligned phase difference film (for example, Patent Document 1). Patent Document 1 also discloses that the laminate is laminated with a polarizing film to obtain an elliptically polarizing plate.

[0003] There is also known a circularly polarizing plate obtained by laminating a polarizing plate and a phase difference layer, the polarizing plate having a polarizing film in which a dichroic dye and a polymerizable liquid crystal compound are horizontally aligned (for example, Patent Document 2).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2020-76920

[0007] Patent Document 2: Japanese Patent Application Publication No. 2013-228706 Summary of the invention

[0008] Problems to be solved by the invention

[0009] There is a demand for further reduction in the thickness of elliptically polarizing plates or circularly polarizing plates (hereinafter, both are collectively referred to as “elliptically polarizing plates”) and further simplification of the manufacturing process of elliptically polarizing plates.

[0010] An object of the present invention is to provide an optical laminate and a method for producing the same which can simplify the production process and achieve thickness reduction.

[0011] Means for solving problems

[0012] The present invention provides the following optical layered body and method for producing the optical layered body.

[0013] [1] An optical laminate, wherein a substrate layer, a light absorption anisotropic layer, a horizontal alignment layer, and a liquid crystal polarizer are laminated in this order,

[0014] 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):

[0015] 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 a plane of the liquid crystal polarizer.

[0016] The substrate layer is directly in contact with the light absorbing anisotropic layer, or there is only a vertical alignment layer between the substrate layer and the light absorbing anisotropic layer.

[0017] The light absorption anisotropic layer is directly in contact with the horizontal alignment layer, or there is only a coating layer between the light absorption anisotropic layer and the horizontal alignment layer.

[0018] The horizontal alignment layer is directly connected to the liquid crystal polarizer.

[0019] A distance from a surface of the light absorption anisotropic layer on the substrate layer side to a surface of the liquid crystal polarizer on a side opposite to the horizontal alignment layer side is 10 μm or less.

[0020] Az>(Ax+Ay) / 2 (1)

[0021] 0.001≤Ax≤0.1 (2)

[0022] Ax(z=60°) / Ax≥5 (3)

[0023] [In formulas (1) to (3),

[0024] Ax, Ay, and Az are absorbances of the absorption maximum wavelength of the light absorption anisotropic layer within the wavelength range of 380 nm to 780 nm, and respectively represent absorbances of linearly polarized light vibrating in the x-axis direction, y-axis direction, and z-axis direction.

[0025] Ax(z=60°) is the absorbance at the absorption maximum wavelength, and indicates the absorbance of linearly polarized light vibrating in the x-axis direction when the light absorption anisotropic layer is rotated 60° about the y-axis.

[0026] The x-axis is any direction in the plane of the light absorption anisotropic layer.

[0027] The y-axis is a direction orthogonal to the x-axis in the plane of the light absorption anisotropic layer.

[0028] The aforementioned z-axis is a direction orthogonal to the aforementioned x-axis and the aforementioned y-axis.]

[0029] [2] The optical laminate according to [1], further comprising a protective layer on the side of the liquid crystal polarizer opposite to the horizontal alignment layer side.

[0030] [3] The optical laminate according to [2], wherein the liquid crystal polarizer is in direct contact with the protective layer.

[0031] [4] The optical laminate according to [2] or [3], further comprising a first liquid crystal retardation layer laminated via a first adhesive layer on the side of the protective layer opposite to the liquid crystal polarizer side.

[0032] 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.

[0033] [5] The optical laminate according to [4], further comprising a second liquid crystal retardation layer laminated via a second adhesive layer on the side of the first liquid crystal retardation layer opposite to the liquid crystal polarizer side.

[0034] 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.

[0035] [6] The optical layered body according to any one of [1] to [5], wherein the substrate layer is a resin film.

[0036] [7] The optical layered body according to any one of [1] to [6], wherein the substrate layer comprises a coating resin layer.

[0037] The resin constituting the coating resin layer is one or more selected from the group consisting of cellulose ester resins, olefin resins, and (meth)acrylic resins.

[0038] [8] The optical layered body according to any one of [1] to [7], wherein the dichroic dye contained in the liquid crystal polarizer is an azo dye.

[0039] [9] A method for producing an optical laminate, wherein a substrate layer, a light absorption anisotropic layer, a horizontal alignment layer, and a liquid crystal polarizer are laminated in this order,

[0040] 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):

[0041] 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 a plane of the liquid crystal polarizer.

[0042] The method for producing the optical laminate comprises the following steps:

[0043] A step of forming the light absorption anisotropic layer in direct contact with the substrate layer or in direct contact with a vertical alignment layer formed on a surface of the substrate layer;

[0044] A step of directly forming the horizontal alignment layer on the light absorption anisotropic layer or forming the horizontal alignment layer via a coating layer; and

[0045] A step of directly coating a composition for forming the liquid crystal polarizer on the horizontal alignment layer, wherein the composition is a composition for forming a liquid crystal polarizer comprising a polymerizable liquid crystal compound and a dichroic pigment,

[0046] The process of forming the horizontal alignment layer includes the following steps:

[0047] [a] a step of directly coating a composition for forming a horizontal alignment layer for forming the horizontal alignment layer on the light-absorbing anisotropic layer; or

[0048] [b] a step of directly applying a coating layer-forming composition for forming the coating layer on the light-absorbing anisotropic layer, and a step of directly applying the horizontal alignment layer-forming composition on the coating layer.

[0049] Az>(Ax+Ay) / 2 (1)

[0050] 0.001≤Ax≤0.1 (2)

[0051] Ax(z=60°) / Ax≥5 (3)

[0052] [In formulas (1) to (3),

[0053] Ax, Ay, and Az are absorbances of the absorption maximum wavelength of the light absorption anisotropic layer within the wavelength range of 380 nm to 780 nm, and respectively represent absorbances of linearly polarized light vibrating in the x-axis direction, y-axis direction, and z-axis direction.

[0054] Ax(z=60°) is the absorbance at the absorption maximum wavelength, and indicates the absorbance of linearly polarized light vibrating in the x-axis direction when the light absorption anisotropic layer is rotated 60° about the y-axis.

[0055] The x-axis is any direction in the plane of the light absorption anisotropic layer.

[0056] The y-axis is a direction orthogonal to the x-axis in the plane of the light absorption anisotropic layer.

[0057] The aforementioned z-axis is a direction orthogonal to the aforementioned x-axis and the aforementioned y-axis.]

[0058]

[10] A method for producing an optical laminate as described in [9], wherein in the optical laminate, the distance from the surface of the light absorption anisotropic layer on the substrate layer side to the surface of the liquid crystal polarizer on the side opposite to the horizontal alignment layer side is 10 μm or less.

[0059]

[11] A method for manufacturing an optical laminate as described in [9] or

[10] , wherein the step of forming the aforementioned light-absorbing anisotropic layer includes the following step: directly coating a composition for forming a light-absorbing anisotropic layer comprising a polymerizable liquid crystal compound and a dichroic pigment on the aforementioned substrate layer or the aforementioned vertical alignment layer.

[0060]

[12] The method for producing an optical layered body according to any one of [9] to

[11] , wherein the optical layered body further comprises a protective layer on the side of the liquid crystal polarizer opposite to the horizontal alignment layer side.

[0061] The manufacturing method further includes the step of directly coating a protective layer-forming composition for forming the protective layer on a surface of the liquid crystal polarizer on the side opposite to the horizontal alignment layer side.

[0062] Effects of the Invention

[0063] According to the present invention, the production process of the optical layered body can be simplified and the optical layered body can be thinned. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] [ Figure 1 ] is a cross-sectional view schematically showing an optical layered body according to one embodiment of the present invention.

[0065] [ Figure 2 ] is a cross-sectional view schematically showing an optical layered body according to another embodiment of the present invention.

[0066] [ Figure 3 ] is a cross-sectional view schematically showing an optical layered body according to another embodiment of the present invention.

[0067] [ Figure 4 ] is a cross-sectional view schematically showing an optical layered body according to another embodiment of the present invention.

[0068] [ 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.

[0069] [ 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.

[0070] Description of Reference Numerals

[0071] 1 to 4 optical laminates, 11 substrate layer, 12 vertical alignment layer, 13 light absorption anisotropic layer, 14 coating layer, 15 horizontal alignment layer, 16 liquid crystal polarizer, 17 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

[0072] Hereinafter, preferred embodiments of the optical layered body and the method for producing the same will be described with reference to the drawings.

[0073] (Optical laminate)

[0074] Figure 1 to Figure 4 The cross-sectional view schematically shows an optical laminate according to one embodiment of the present invention. The optical laminates 1 to 4 are obtained by sequentially stacking a substrate layer 11, a light absorption anisotropic layer 13, a horizontal alignment layer 15, and a liquid crystal polarizer 16. The light absorption anisotropic layer 13 comprises a polymer of a polymerizable liquid crystal compound and a dichroic pigment, and satisfies the relationship of formulas (1) to (3) described later. The liquid crystal polarizer 16 comprises a polymer of a polymerizable liquid crystal compound and a dichroic pigment, and has an absorption axis in the horizontal direction relative to the plane of the liquid crystal polarizer 16.

[0075] The optical laminates 1 to 4 may further include a protective layer 17 on the side of the liquid crystal polarizer 16 opposite to the horizontal alignment layer 15 side.

[0076] The optical laminates 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. Figure 3 and Figure 4 As shown, the first liquid crystal phase difference layer 22 may be provided on the side of the protective layer 17 opposite to the liquid crystal polarizer 16, and the second liquid crystal phase difference layer 24 may be provided on the side of the first liquid crystal phase difference layer 22 opposite to the liquid crystal polarizer 16. 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.

[0077] When the optical laminate 3 and 4 do not have the protective layer 17, the first liquid crystal phase difference layer 22 can be laminated on the side of the liquid crystal polarizer 16 opposite to the horizontal alignment layer 15 side. The first liquid crystal phase difference layer 22 can also be laminated on the liquid crystal polarizer 16 or the protective layer 17 via the first adhesive layer 21. In this case, the first adhesive layer 21 is preferably directly in contact with the first liquid crystal phase difference layer 22 and the liquid crystal polarizer 16 or the protective layer 17. The second liquid crystal phase difference layer 24 can also be laminated on the first liquid crystal phase difference layer 22 via the second adhesive layer 23. In this case, the second adhesive layer 23 is preferably directly in contact with the second liquid crystal phase difference layer 24 and the first liquid crystal phase difference layer 22 or the first alignment layer described later.

[0078] The optical stack 3 and 4 may have a first orientation layer (not shown) directly connected to the first liquid crystal phase difference layer 22. The first orientation layer may be arranged between the liquid crystal polarizer 16 or the protective layer 17 and the first liquid crystal phase difference layer 22. In the case where the optical stack 3 and 4 have the first adhesive layer 21, the first orientation layer may be arranged between the first liquid crystal phase difference layer 22 and the first adhesive layer 21. Alternatively, the first orientation layer may be arranged on the side of the first liquid crystal phase difference layer 22 opposite to the liquid crystal polarizer 16 side. The optical stack 3 and 4 may have a second orientation layer (not shown) directly connected to 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.

[0079] 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.

[0080] In the optical laminates 3 and 4 as elliptically polarizing plates, a positive C plate having anisotropy in the thickness direction may be included from the viewpoint of being able to compensate for the function of preventing reflection in the oblique direction. In the optical laminates 3 and 4, for example, the first liquid crystal phase difference layer 22 may be a λ / 4 liquid crystal phase difference layer with reverse wavelength dispersion, and the second liquid crystal phase difference layer 24 may be a positive C plate. The optical laminates 3 and 4 may also have a positive C plate in addition to the first liquid crystal phase difference layer 22 and the second liquid crystal phase difference layer 24.

[0081] In the optical laminates 1 to 4, the substrate layer 11 and the light absorption anisotropic layer 13 are directly in contact ( Figure 1 , Figure 3 ), or, only a vertical alignment layer 12 ( Figure 2 , Figure 4 ). When the optical laminates 1 to 4 include the vertical alignment layer 12, the vertical alignment layer 12 is directly in contact with the substrate layer 11 and the light absorption anisotropic layer 13. This can reduce the thickness of the optical laminates 1 to 4 and simplify the production process of the optical laminates 1 to 4 as described below.

[0082] In the optical laminates 1 to 4, the light absorption anisotropic layer 13 is directly in contact with the horizontal alignment layer 15 ( Figure 1 , Figure 3 ), or, there is only a coating layer 14 ( Figure 2 , Figure 4 ). The coating layer 14 is usually a resin layer other than the adhesive layer. When the optical laminates 1 to 4 include the coating layer 14, the coating layer 14 is directly in contact with the light absorption anisotropic layer 13 and the horizontal alignment layer 15. Thus, the optical laminates 1 to 4 can be made thinner. In addition, the manufacturing process of the optical laminates 1 to 4 can be simplified as described below.

[0083] In the optical laminates 1 to 4, the horizontal alignment layer 15 is directly in contact with the liquid crystal polarizer 16. Therefore, in the optical laminates 1 to 4, the horizontal alignment layer 15 provided directly in contact with the light absorption anisotropic layer 13 or the coating layer 14 is directly in contact with the liquid crystal polarizer 16. This can achieve a reduction in the thickness of the optical laminates 1 to 4, and can also simplify the manufacturing process of the optical laminates 1 to 4 as described later.

[0084] When the optical layered bodies 1 to 4 include the protective layer 17, the liquid crystal polarizer 16 may be directly in contact with the protective layer 17. This allows the optical layered bodies 1 to 4 to be made thinner.

[0085] In the optical laminates 1 to 4, the distance D from the surface of the light absorption anisotropic layer 13 on the substrate layer 11 side to the surface of the liquid crystal polarizer 16 on the side opposite to the horizontal alignment layer 15 side is 10 μm or less. The distance D may be 9 μm or less, 8 μm or less, or 7 μm or less, and is usually 1 μm or more, or 2 μm or more. By making the distance D within the above range, the optical laminates 1 to 4 can be made thinner.

[0086] As described above, the light absorption anisotropic layer 13 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 absorption maximum wavelength of the light absorption anisotropic layer 13 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 absorption maximum wavelength, and indicates the absorbance of linearly polarized light vibrating in the x-axis direction when the light absorption anisotropic layer 13 is rotated 60° about the y-axis.

[0093] The x-axis is any direction in the plane of the light absorption anisotropic layer 13.

[0094] The y-axis is a direction orthogonal to the x-axis in the plane of the light absorption anisotropic layer 13.

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

[0096] It is believed that by making the light absorption anisotropic layer 13 satisfy the relationship of the above-mentioned formulas (1) to (3), the absorption axis of the dichroic pigment is oriented in a direction perpendicular to the plane of the light absorption anisotropic layer 13. Therefore, the light absorption anisotropic layer 13 can effectively transmit light from the front direction and effectively absorb light from the oblique direction.

[0097] The absorbance Az in the z direction in the above formula (1) is measured by making light incident on the side surface of the photoabsorption anisotropic layer 13, so it is difficult to measure. Therefore, when the angle between the vibration plane of the linearly polarized light as the measurement light and the x-y plane of the photoabsorption anisotropic layer 13 is 90°, with respect to this vibration plane, the x-y plane of the photoabsorption anisotropic layer 13 is tilted by 30° and 60° along the incident direction of the linearly polarized light for measurement, whereby the absorbance Az in the z direction can be calculated.

[0098] Specifically, the calculation can be performed using the following methods or the like.

[0099] In a state where the photoabsorption anisotropic layer 13 is rotated by 30° and 60° about the y-axis, the same linearly polarized light as the linearly polarized light for measuring Ax is made incident, whereby the absorbances Ax(z = 30°) and Ax(z = 60°) are measured respectively. Similarly, in a state where the photoabsorption anisotropic layer 13 is rotated by 30° and 60° about the x-axis, the same linearly polarized light as the linearly polarized light for measuring Ay is made incident, whereby the absorbances Ay(z = 30°) and 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 the same linearly polarized light as the linearly polarized light for measuring Ax incident in a state where the photoabsorption anisotropic layer 13 is rotated by 90° about the y-axis. Ay(z = 90°) is the absorbance measured by making the same linearly polarized light as the linearly polarized light for measuring Ax incident in a state where the photoabsorption anisotropic layer 13 is rotated by 90° about the x-axis.

[0102] Particularly, in the case where there is no absorption anisotropy in the x-y plane of the light absorption anisotropic layer 13, that is, when 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°), the relationship of A(z = 30°) < A(z = 60°) < A(z = 90°) = Az is satisfied. In addition, if A(z = 30°) > (Ax + Ay) / 2, it can be said that Az necessarily satisfies equation (1).

[0103] The above-mentioned Ax and Ay refer to the absorbances in the front direction of the light absorption anisotropic layer 13. The smaller the values of Ax and Ay, the more precisely it can be said that the dichroic pigment in the light absorption anisotropic layer 13 is oriented in the direction perpendicular to the plane. Preferably, both the values of Ax and Ay are 0.3 or less. When the values of Ax and Ay are both greater than 0.3, the coloring in the front direction of the light absorption anisotropic layer 13 becomes stronger, so there is a tendency for the front transmittance color difference when the light absorption anisotropic layer 13 is applied to a display device. The values of Ax and Ay are each independently preferably 0.1 or less, more preferably 0.05 or less, and further preferably 0.02 or less. Additionally, the lower limit values of the values of Ax and Ay are each independently usually 0.001 or more, can also be 0.003 or more, and can also be 0.005 or more. For the light absorption anisotropic layer 13 that satisfies the relationship of the above equation (2), it can be said that the absorption axis of the dichroic pigment is precisely oriented in the direction perpendicular to the plane of the light absorption anisotropic layer 13. When the absorbance Ax is greater than 0.3, the coloring in the front direction of the light absorption anisotropic layer 13 becomes stronger, so there is a tendency for the front color difference when combined with, for example, a circular polarizing plate and applied to an organic EL display device.

[0104] In the light absorption anisotropic layer 13, Ax and Ay are preferably the same value. When Ax and Ay are different, there is absorption anisotropy in the plane of the light absorption anisotropic layer 13, and when the light absorption anisotropic layer 13 is applied to a display device, there is a tendency for the coloring of the front hue to increase.

[0105] For Ax(z = 60°) / Ax in the above equation (3), the larger its value, the more excellent the light absorption anisotropy is shown. They are each independently preferably greater than 5, more preferably 7 or more, further preferably 10 or more, and additionally, preferably 50 or less.

[0106] In the light absorption anisotropic layer 13 satisfying the relationship of the above formula (3), it is considered that the absorption axis of the dichroic dye is oriented in a direction perpendicular to its plane, and therefore the light absorption anisotropic layer 13 can effectively absorb light from an oblique direction.

[0107] The above-mentioned Ax (z = 60°) refers to the oblique absorbance of the light absorption anisotropic layer 13, and can be appropriately selected according to the light leaking obliquely along the display device. Ax (z = 60°) is preferably 1.0 or less, more preferably 0.5 or less, and further preferably 0.3 or less. In addition, the lower limit is usually 0.001 or more, and can also be 0.003 or more. Considering its necessity, it is 0.01 or more.

[0108] The light absorption anisotropic layer 13 satisfying the relationship of the above-mentioned formulas (1) to (3) can be adjusted by, for example, the thickness of the light absorption anisotropic layer 13, the conditions of the manufacturing process of the light absorption anisotropic layer 13, the type or content of the dichroic dye and the polymerizable liquid crystal compound contained in the light absorption anisotropic layer forming composition used to obtain the light absorption anisotropic layer 13, etc.

[0109] The details of each layer included in the optical layered bodies 1 to 4 will be described later.

[0110] (Method for producing optical layered body)

[0111] Figure 5 and Figure 6 The cross-sectional view schematically shows a manufacturing process of an optical laminate according to one embodiment of the present invention. The manufacturing method of the optical laminate is, for example, the manufacturing method of the optical laminate 1 to 4 described above, which is a manufacturing method of an optical laminate obtained by sequentially stacking a substrate layer 11, a light absorption anisotropic layer 13, a horizontal alignment layer 15, and a liquid crystal polarizer 16.

[0112] As described above, the light absorption anisotropic layer 13 includes a polymer of a polymerizable liquid crystal compound and a dichroic pigment, and satisfies the above-mentioned relationships of formulas (1) to (3). As described above, the liquid crystal polarizer 16 includes a polymer of a polymerizable liquid crystal compound and a dichroic pigment, and has an absorption axis in the horizontal direction relative to the plane of the liquid crystal polarizer 16.

[0113] The optical laminates 1 to 4 may further include the protective layer 17. In the optical laminates 1 to 4, the distance D (the distance from the surface of the light absorption anisotropic layer 13 on the substrate layer 11 side to the surface of the liquid crystal polarizer 16 on the side opposite to the horizontal alignment layer 15 side) may be within the above range.

[0114] The optical laminates 1 to 4 may further include the first liquid crystal phase difference layer 22, or the first orientation layer. The optical laminates 1 to 4 may further include the second liquid crystal phase difference layer 24, or the second orientation 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, 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 ) may further include a second adhesive layer 23.

[0115] The method for producing the optical layered bodies 1 to 4 includes the following steps:

[0116] A step of forming the light absorption anisotropic layer 13 in direct contact with the base layer 11 or in direct contact with the vertical alignment layer 12 formed on the surface of the base layer 11 ( Figure 5 (a) Figure 6 (a));

[0117] A step of forming the horizontal alignment layer 15 directly on the light absorption anisotropic layer 13 or forming the horizontal alignment layer 15 via the coating layer 14 ( Figure 5 (b) Figure 6 (c)); and

[0118] A step of directly coating a composition for forming a liquid crystal polarizer 16 on the horizontal alignment layer 15 . The composition is a composition for forming a liquid crystal polarizer including a polymerizable liquid crystal compound and a dichroic dye.

[0119] Thus, a liquid crystal polarizer 16 ( Figure 5 (c) Figure 6 (d)).

[0120] The process of forming the horizontal alignment layer 15 includes the following process [a] or [b].

[0121] [a] A step of directly applying a composition for forming a horizontal alignment layer for forming the horizontal alignment layer 15 onto the light absorption anisotropic layer 13 .

[0122] [b] A step of directly applying a coating layer forming composition for forming the coating layer 14 on the light absorption anisotropic layer 13 , and a step of directly applying a horizontal alignment layer forming composition on the coating layer 14 .

[0123] Through the above-mentioned step [a], a horizontal alignment layer 15 ( Figure 5By the above-mentioned step [b], a coating layer 14 is formed on the light absorption anisotropic layer 13 ( Figure 6 (b)), a horizontal alignment layer 15 is formed on the coating layer 14 ( Figure 6 (c)).

[0124] In the method for producing the optical laminates 1 to 4, a horizontal alignment layer 15 is formed on the light absorption anisotropic layer 13 by the above-mentioned step [a] or [b], and a liquid crystal polarizer forming composition is directly applied on the horizontal alignment layer 15 to form a liquid crystal polarizer 16. Therefore, it is possible to produce: an optical laminate 1, 3 in which the light absorption anisotropic layer 13 and the horizontal alignment layer 15 are directly in contact with each other, and the horizontal alignment layer 15 and the liquid crystal polarizer 16 are directly in contact with each other; or an optical laminate 2, 4 in which only the coating layer 14 is provided between the light absorption anisotropic layer 13 and the horizontal alignment layer 15, and the horizontal alignment layer 15 and the liquid crystal polarizer 16 are directly in contact with each other. Thus, it is possible to achieve a thinner optical laminate 1 to 4. As described above, in the method for producing the optical laminates 1 to 4, a liquid crystal polarizer forming composition is directly applied on the horizontal alignment layer 15 formed on the light absorption anisotropic layer 13 or the coating layer 14. Therefore, the production process of the optical layered bodies 1 to 4 can also be simplified.

[0125] The step of forming the light absorption anisotropic layer 13 may include the following step: directly coating a composition for forming a light absorption anisotropic layer containing a polymerizable liquid crystal compound and a dichroic pigment on the substrate layer 11 or the vertical alignment layer 12. In this way, the optical laminate 1, 3 in which the substrate layer 11 and the light absorption anisotropic layer 13 are directly in contact, or the optical laminate 2, 4 having only the vertical alignment layer 12 between the substrate layer 11 and the light absorption anisotropic layer 13 can be manufactured.

[0126] The method for producing the optical laminates 1 to 4 may further include the step of directly applying a protective layer forming composition for forming the protective layer 17 to the surface of the liquid crystal polarizer 16 on the side opposite to the horizontal alignment layer 15. In this way, the optical laminates 1 to 4 in which the liquid crystal polarizer 16 and the protective layer 17 are directly in contact can be produced, and the optical laminates 1 to 4 can be made thinner.

[0127] The method for producing the optical layered bodies 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 16 or the protective layer 17 of the optical layered bodies 1 and 2 .

[0128] The first liquid crystal retardation layer 22 may be laminated on the liquid crystal polarizer 16 or the protective layer 17 via the first tackiness adhesive layer 21. Alternatively, the first orientation layer and the first liquid crystal retardation layer 22 may be formed on the liquid crystal polarizer 16 or the protective layer 17 in this order.

[0129] When the optical stack 3 and 4 have the first liquid crystal phase difference layer 22 and the second liquid crystal phase difference layer 24, the first liquid crystal phase difference layer 22 and the second liquid crystal phase difference layer 24 can be sequentially provided on the liquid crystal polarizer 16 or the protective layer 17 of the optical stack 1 and 2. Alternatively, after the stack of the first liquid crystal phase difference layer 22 and the second liquid crystal phase difference layer 24 is prepared, the stack can be attached to the liquid crystal polarizer 16 or the protective layer 17 of the optical stack 1 and 2. The first liquid crystal phase difference layer 22 and the second liquid crystal phase difference layer 24 can be stacked with the second adhesive layer 23 interposed therebetween, or the second orientation layer and the second liquid crystal phase difference layer can be sequentially formed on the first liquid crystal phase difference layer 22 or the first orientation layer.

[0130] Hereinafter, the layers included in the optical layered body, the components contained in the layers, and the like will be described in detail.

[0131] (Base material layer)

[0132] The substrate layer 11 may include one or more of a resin film (film substrate), a coating resin layer, and a glass substrate. The substrate layer 11 may be a single-layer structure or a multi-layer structure. The substrate layer 11 preferably includes a resin film or a coating layer, or may be a laminate of other layers such as a resin film and a coating resin layer.

[0133] When the substrate layer 11 is a resin film, the substrate layer 11 can support, for example, the light absorption anisotropic layer 13. The substrate layer 11 may be a layer to which a composition for forming a light absorption anisotropic layer is applied for forming the light absorption anisotropic layer 13. When the vertical alignment layer 12 is used to form the light absorption anisotropic layer 13, the vertical alignment layer 12 may be formed on the side of the surface of the substrate layer 11 where the light absorption anisotropic layer 13 is to be formed.

[0134] When the substrate layer 11 includes a coating resin layer, the substrate layer 11 may be a coating resin layer or a layer obtained by forming a coating resin layer on one or both sides of a resin film. When the substrate layer 11 is a coating resin layer, it may be a layer obtained by coating a resin composition on the light absorption anisotropic layer 13 or the vertical alignment layer 12 and curing it.

[0135] As the resin constituting the resin film, for example, olefin resins such as polyethylene and polypropylene; cyclic olefin resins having a ring system 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; polyphenylene ether, etc. The so-called "(meth) acrylic-" refers to at least one of "acrylic-" and "methacrylic-". The same applies to the expression of (meth)acryloyl, etc.

[0136] 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.).

[0137] When the base material layer 11 is a coating resin layer, for example, the coating resin layer can be formed on a resin film, and after the light absorption anisotropic layer 13 is formed on the coating resin layer, the resin film is peeled off, thereby using the coating resin layer as the base material layer 11. In this case, the resin film is easily peeled off by subjecting the surface of the resin film on the side where the coating resin layer is to be formed to a release treatment (forming a release layer by applying a release agent or the like). The peeled resin film can also be used as a surface protective film.

[0138] As the coating resin layer, there can be mentioned: a layer formed by coating a hard coating composition, a resin composition containing a water-soluble polymer (a resin composition containing a water-soluble polymer) used in a coating layer forming composition described later for forming a coating layer, an easy-adhesion composition, or a coupling agent on the surface of a resin film; a layer formed by irradiating active energy rays to graft polymerize reactive monomers or reactive polymers after coating. As a resin film having a coating resin layer, a hard coating film having a hard coating layer as the coating resin layer is preferred. In the case where the substrate layer is a hard coating film, a light absorbing anisotropic layer 13 can be laminated on the hard coating side. As the coating resin layer, a hard coating layer is preferred.

[0139] The hard coat layer is preferably a cured layer of a curable composition (hard coat composition) containing an active energy ray-curable resin, and more preferably a cured layer of a composition containing an ultraviolet-curable resin. The curable composition containing an ultraviolet-curable resin preferably contains a (meth) acrylic compound as a curable component, and the hard coat layer is preferably formed of a (meth) acrylic resin. The (meth) acrylic compound is a compound having at least one (meth) acryloyl group, and can be a monomer, an oligomer, or a polymer.

[0140] As (meth) acrylic compounds, for example, (meth) acrylic compounds such as monofunctional (meth) acrylic ester compounds and multifunctional (meth) acrylic ester compounds; carbamate (meth) acrylic ester compounds such as multifunctional carbamate (meth) acrylic ester compounds; epoxy (meth) acrylic ester compounds such as multifunctional epoxy (meth) acrylic ester compounds; carboxyl modified epoxy (meth) acrylic ester compounds; polyester (meth) acrylic ester compounds, etc. They can be used alone or in combination. Among them, preferably a multifunctional (meth) acrylic ester compound or a carbamate (meth) acrylic ester compound, more preferably a combination of a multifunctional (meth) acrylic ester compound and a carbamate (meth) acrylic ester.

[0141] The content of the multifunctional (meth)acrylate compound is preferably 50 to 100 parts by mass, more preferably 60 to 95 parts by mass, and further preferably 70 to 90 parts by mass, relative to 100 parts by mass of the solid content of the curable composition. In this specification, the solid content of the curable composition refers to the total amount of the components after removing the solvent from the curable composition when the curable composition contains a solvent.

[0142] The curable 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 may be used. Examples of the photopolymerization initiator include photocationic polymerization initiators.

[0143] The curable composition can be cured by being coated on a film substrate and then irradiated with active energy rays to polymerize curable components such as a (meth)acrylic compound.

[0144] 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 Coatings - Section 4: Scratch Hardness (Pencil Method)", and may also be 5B or harder.

[0145] The surface of the substrate layer 11 on the side where the light absorption anisotropic layer 13 is to be formed may be subjected to a surface treatment. Examples of the surface treatment method include a method of subjecting the surface of the substrate layer 11 to a corona treatment or a plasma treatment in an atmosphere of vacuum to atmospheric pressure, a method of subjecting the surface of the substrate layer 11 to a laser treatment, a method of subjecting the surface of the substrate layer 11 to an ozone treatment, a method of subjecting the surface of the substrate layer 11 to a saponification treatment, and the like.

[0146] The thickness of the base material layer 11 is preferably 0.5 μm to 30 μm, or 0.5 μm to 28 μm, or 1 μm to 25 μm, or 1 μm to 15 μm, or 1 μm to 10 μm, or 1 μm to 5 μm.

[0147] The thickness of the resin film that can be included in the base material layer 11 is preferably thin from the viewpoint of quality to the extent that it can be handled in a practical manner, but if it is too thin, the strength is reduced and there is a tendency for poor processability. From this viewpoint, the thickness of the resin film is preferably 5 μm to 30 μm, more preferably 10 μm to 28 μm, further preferably 10 μm to 25 μm, and may also be 10 μm to 23 μm.

[0148] If the thickness of the coating resin layer that the base material layer 11 may include is too thin, the strength is reduced, and if it is too thick, there is a tendency to generate cracks, etc. From this viewpoint, the thickness of the coating resin layer is preferably 0.5 μm to 20 μm, more preferably 1 μm to 15 μm, further preferably 1 μm to 10 μm, and further preferably 1 μm to 5 μm.

[0149] (Vertical Alignment Layer)

[0150] The vertical alignment layer 12 has an alignment control force that enables the polymerizable liquid crystal compound in the light absorption anisotropic layer-forming composition used to form the light absorption anisotropic layer 13 to be aligned in a vertical direction relative to the plane of the light absorption anisotropic layer 13. The polymerizable liquid crystal compound is aligned in the vertical direction, which means that the long axis of the polymerizable liquid crystal compound is aligned in the vertical direction, and the vertical direction means 90°±20° relative to the plane of the light absorption anisotropic layer 13. The state of liquid crystal alignment varies depending on the properties of the vertical alignment layer 12 and the polymerizable liquid crystal compound, and their combination can be arbitrarily selected.

[0151] When the orientation layer is formed of an orientation polymer, the orientation control force can be arbitrarily adjusted by the surface state and friction conditions. When the orientation layer is formed of a photo-orientation polymer, the orientation control force can be arbitrarily adjusted by polarized light irradiation conditions, etc. In addition, the liquid crystal orientation can also be controlled by selecting the surface tension, liquid crystal properties and other physical properties of the polymerizable liquid crystal compound.

[0152] As the vertical alignment layer 12, it is preferred that the vertical alignment layer 12 is insoluble in the solvent used when forming the light absorption anisotropic layer 13 on the vertical alignment layer 12 and has heat resistance in the heating treatment for removing the solvent and aligning the liquid crystal. The vertical alignment layer 12 can be formed using a composition for forming a vertical alignment layer. As the vertical alignment layer 12, there can be cited a polymer alignment layer formed of an aligning polymer, a photoalignment layer and a groove alignment layer, a stretched film stretched along the alignment direction, etc. In the case of applying to a long roll film, the photoalignment layer is preferably used from the aspect that the alignment direction can be easily controlled.

[0153] The thickness of the vertical alignment layer 12 is usually 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.

[0154] The composition for forming the vertical orientation layer of the rubbing orientation layer includes an orientation polymer. As the orientation polymer, polyamides, gelatins, polyimides with amide bonds in the molecule, and polyamic acids, polyvinyl alcohol, alkyl-modified polyvinyl alcohol, polyacrylamide, polyoxazole, polyethyleneimine, polystyrene, polyvinyl pyrrolidone, polyacrylic acid and polyacrylates as their hydrolyzates can be cited. Among them, from the viewpoint of suppressing the migration of azo pigments from adjacent layers, polyvinyl alcohol is preferably used. These orientation polymers can be used alone or in combination of two or more.

[0155] The oriented polymer composition containing an oriented polymer for forming a rubbed orientation layer (vertical orientation layer forming composition) may be a resin composition containing a water-soluble polymer (resin composition containing a water-soluble polymer) used in the coating layer forming composition described later for forming a coating layer.

[0156] The rubbing method includes a method in which a film of an oriented polymer formed by applying an oriented polymer composition to a film substrate and annealing the film substrate to form a surface of the film substrate is brought into contact with a rubbing roll wound with a rubbing cloth and rotating.

[0157] The composition for forming a vertical alignment layer of the photo-alignment layer comprises a polymer, oligomer or monomer having a photoreactive group. For the photo-alignment layer, the alignment control force can be obtained by irradiating the coating layer formed by applying the composition for forming the photo-alignment layer (vertical alignment layer forming composition) to the film substrate with polarized light. From the perspective of being able to arbitrarily control the direction of the alignment control force by selecting the polarization direction of the irradiated polarized light, the photo-alignment layer is more preferably used.

[0158] 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 photoreactions such as orientation induction or isomerization reaction, dimerization reaction, photocrosslinking reaction or photodecomposition reaction of molecules generated by irradiation with light, which are the source of liquid crystal orientation ability. Among the photoreactive groups, groups that undergo dimerization reaction or photocrosslinking reaction are 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).

[0159] As photoreactive groups with C=C bonds, for example, vinyl, polyene, stilbene, stilbazolyl, stilbazolinium, chalcone and cinnamoyl groups can be cited. From the perspective of easy control of reactivity and the presentation of orientation control force during photo-orientation, chalcone and cinnamoyl groups are preferred. As photoreactive groups with C=N bonds, groups with structures such as aromatic Schiff bases and aromatic hydrazones can be cited. As photoreactive groups with N=N bonds, groups with azobenzene oxide as the basic structure such as azobenzene, azonaphthyl, aromatic heterocyclic azo, disazo and formazan can be cited. As photoreactive groups with C=O bonds, benzophenone, coumarin, anthraquinone and maleimide groups can be cited. These groups can have substituents such as alkyl, alkoxy, aryl, allyloxy, cyano, alkoxycarbonyl, hydroxyl, sulfonic acid and halogenated alkyl. From the viewpoint of excellent orientation and reactivity, the photo-orientation polymer preferably has a photoreactive group that undergoes dimerization reaction or photocrosslinking reaction, and more preferably has a photoreactive group that undergoes dimerization reaction. As such a photoreactive group, a group having a cinnamoyl structure, a group having a chalcone structure, a group having a coumarin structure, a group having a benzophenone structure, a group having an anthracene structure, etc. can be cited. Among them, a group having a cinnamoyl structure and a group having a chalcone structure are preferred, and a group having a cinnamoyl structure is more preferred.

[0160] 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 film substrate side and transmitting polarized light to irradiate. In addition, the polarized light is particularly preferably substantially parallel light. The wavelength of the irradiated polarized light is the wavelength of the wavelength region in which 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 ultraviolet light with a wavelength of 313nm of these lamps is large, so it is preferred. The light from the above-mentioned light source can be irradiated through an appropriate polarizer, thereby irradiating polarized light. As the polarizer, polarizing filters, Glan-Thompson, Glan-Taylor polarizing prisms, and wire grid polarizers can be used.

[0161] (Light Absorption Anisotropic Layer)

[0162] The light absorption anisotropic layer 13 contains a polymer of a polymerizable liquid crystal compound and a dichroic pigment. The light absorption anisotropic layer 13 only needs to contain one polymer of a polymerizable liquid crystal compound, or it may contain two or more polymers of a polymerizable liquid crystal compound. The light absorption anisotropic layer 13 only needs to contain one dichroic pigment, or it may contain two or more dichroic pigments.

[0163] The light absorption anisotropic layer 13 can be formed using a composition for forming a light absorption anisotropic layer containing a polymerizable liquid crystal compound and a dichroic pigment. In the composition for forming a light absorption anisotropic layer, as a solid component, in addition to the polymerizable liquid crystal compound and the dichroic pigment, a non-liquid crystal compound having a polymerizable group and additives such as a polymerization initiator, a leveling agent, an alignment promoter, a reactive additive, an antioxidant, and a photosensitizer may be included as described later. Therefore, the light absorption anisotropic layer 13 may also contain a polymer of a non-liquid crystal compound having a polymerizable group and additives.

[0164] 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 13 may be formed by a composition for forming a light absorption anisotropic layer containing a polymerizable liquid crystal compound and a dichroic pigment, or may be a liquid crystal cured film (a cured material layer of the polymerizable liquid crystal compound) obtained by polymerizing and curing the polymerizable liquid crystal compound in the composition for forming a light absorption anisotropic layer. 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, and the polymerizable liquid crystal compound may also be polymerized with a dichroic pigment.

[0165] Relative to 100 parts by mass of the light absorption anisotropic layer 13, the content of the polymer of the polymerizable liquid crystal compound in the light absorption anisotropic layer 13 is preferably 40 parts by mass or more and 99.9 parts by mass or less, and may be 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 that the orientation of the polymer of the polymerizable liquid crystal compound when forming the light absorption anisotropic layer 13 becomes higher. The content ratio of the polymer of the polymerizable liquid crystal compound in the light absorption anisotropic layer 13 can be calculated as the ratio of the polymerizable liquid crystal compound (the total amount when two or more are included) to 100 parts by mass of the solid content of the light absorption anisotropic layer forming composition for forming the light absorption anisotropic layer. The so-called solid content of the light absorption anisotropic layer forming composition refers to all the components after removing volatile components such as organic solvents from the light absorption anisotropic layer forming composition.

[0166] The content of the dichroic pigment in the light absorption anisotropic layer 13 is preferably 0.1 to 30 parts by mass, or 0.5 to 20 parts by mass, or 1 to 10 parts by mass, or 1 to 5 parts by mass, relative to 100 parts by mass of the light absorption anisotropic layer 13. The content ratio of the dichroic pigment in the light absorption anisotropic layer 13 can be calculated as the ratio of the dichroic pigment relative to 100 parts by mass of the solid content of the light absorption anisotropic layer forming composition. The content of the dichroic pigment in the case where the light absorption anisotropic layer 13 contains two or more dichroic pigments refers to the total amount thereof.

[0167] The thickness of the light absorption anisotropic layer 13 is preferably 0.2 μm to 5.0 μm, more preferably 0.5 μm to 4.0 μm, and further preferably 0.5 μm to 3.0 μm. If the thickness of the light absorption anisotropic layer 13 is reduced, the absorption of light from the oblique direction tends to be weakened, and if the thickness is increased, the orientation of the dichroic dye tends to be disordered, and thus the transmission characteristics in the front direction tend to be reduced.

[0168] The surface of the light absorbing anisotropic layer 13 on the side opposite to the substrate layer 11 side may be subjected to a surface treatment. Examples of the surface treatment method include a method of subjecting the surface of the light absorbing anisotropic layer 13 to a corona treatment or a plasma treatment in an atmosphere of vacuum to atmospheric pressure, a method of subjecting the surface to a laser treatment, a method of subjecting the surface to an ozone treatment, a method of subjecting the surface to a flame treatment, and the like.

[0169] (Polymerizable Liquid Crystal Compound)

[0170] The polymerizable liquid crystal compound contained in the composition for forming a light absorption anisotropic layer is used to align the dichroic dye by guest-host interaction. The polymerizable liquid crystal compound is a compound having one or more polymerizable groups in the molecule and having liquid crystallinity.

[0171] The polymerizable group refers to a group participating in the polymerization reaction, preferably a photopolymerizable group. Here, the so-called photopolymerizable group refers to a group that can participate in the polymerization reaction using active free radicals, acids, etc. produced by the photopolymerization initiator described later. As the polymerizable group, vinyl, vinyloxy, 1-chlorovinyl, isopropenyl, 4-vinylphenyl, (methyl) acryloyl, (methyl) acryloyloxy, oxirane, oxetane, etc. can be cited. Among them, preferably (methyl) acryloyl, (methyl) acryloyloxy, vinyloxy, oxirane, and oxetane, more preferably (methyl) acryloyl and (methyl) acryloyloxy. Liquid crystal can be either a thermotropic liquid crystal or a lyotropic liquid crystal. When mixed with the above-mentioned dichroic pigment, it is preferably a thermotropic liquid crystal.

[0172] When a polymer of a polymerizable liquid crystal compound is formed by a polymerization reaction and exhibits light absorption anisotropy as a film containing the polymer and a dichroic pigment, the liquid crystal state displayed by the polymerizable liquid crystal compound is a smectic phase, and from the viewpoint of high performance of optical properties, a high-order smectic phase is preferably used. Among them, a high-order smectic polymerizable liquid crystal compound that forms 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 is more preferably used, and a high-order smectic polymerizable liquid crystal compound that forms a smectic B phase, a smectic F phase, or a smectic I phase is further preferably used. If the liquid crystal phase formed by the polymerizable liquid crystal compound is these high-order smectic phases, a light absorption anisotropic layer 13 with higher light absorption anisotropy can be manufactured. In this way, a light absorption anisotropic layer 13 with 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 the light absorbing anisotropic layer 13, its periodic interval can be From the viewpoint of obtaining higher light absorption anisotropic characteristics, the light absorption anisotropic layer 13 preferably includes a polymer of a polymerizable liquid crystal compound oriented in a smectic phase.

[0173] The polymerizable liquid crystal compound may be a monomer, an oligomer obtained by polymerizing a polymerizable group, or a polymer. As such a polymerizable liquid crystal compound, a known polymerizable liquid crystal compound may be used, for example, a polymerizable liquid crystal compound described in Japanese Patent Publication No. 2020-76920 and Japanese Patent No. 6728581 may be cited.

[0174] (Dichroic Pigments)

[0175] The so-called dichroic pigment refers to a pigment having a property that the absorbance in the long axis direction of the molecule is different from the absorbance in the short axis direction of the molecule. As a dichroic pigment, it is preferred to have the characteristic of absorbing visible light, and more preferably to have an absorption maximum wavelength (λmax) within the range of 380 to 680 nm.

[0176] As such dichroic pigment, for example, acridine pigment, oxazine pigment, cyanine pigment, naphthalene pigment, azo pigment and anthraquinone pigment etc. can be enumerated, wherein, preferably azo pigment.As azo pigment, monoazo pigment, disazo pigment, triazo pigment, tetraazo pigment and stilbene azo pigment etc. can be enumerated, preferably disazo pigment and triazo pigment.Dichroic pigment can be separately also can combine more than 2 kinds, but preferably according to the wavelength range of light absorption anisotropy requirement in light absorption anisotropy layer and use in combination more than 2 kinds.

[0177] Examples of the azo dye include compounds represented by formula (I) (hereinafter also referred to as “compound (I)”).

[0178] K 1 (-N=NK 2 ) p -N=NK 3 (I)

[0179] [In formula (I),

[0180] 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.

[0181] 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.

[0182] p represents an integer of 1-4.

[0183] When p is an integer greater than 2, multiple K 2 They can be the same or different from each other.

[0184] 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.]

[0185] 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.

[0186] As K 1 and K 3 The phenyl, naphthyl and monovalent heterocyclic groups in 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 methoxy, ethoxy and butoxy; a fluoroalkyl group having 1 to 4 carbon atoms such as trifluoromethyl; a cyano group; a nitro group; a halogen atom; a substituted or unsubstituted amino group such as amino, diethylamino and pyrrolidinyl (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.).

[0187] Among the compounds (I), preferred are compounds represented by any one of formula (I-1) to (I-8), more preferred are compounds represented by any one of formula (I-1) to (I-3), and even more preferred are compounds represented by any one of formula (I-1) and (I-3).

[0188] [Chemical formula 1]

[0189]

[0190] [In formulas (I-1) to (I-8),

[0191] 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.

[0192] n1 to n4 independently represent integers of 0 to 3.

[0193] When n1 is greater than 2, multiple B 2 They can be the same or different from each other.

[0194] When n2 is greater than 2, multiple B 6 They can be the same or different from each other.

[0195] When n3 is greater than 2, multiple B 9 They can be the same or different from each other.

[0196] When n4 is 2 or more, multiple B 14 They may be the same or different from each other.]

[0197] As the anthraquinone dye, a compound represented by formula (I-9) is preferred.

[0198] [Chemical formula 2]

[0199]

[0200] [In formula (I-9),

[0201] R 1 ~R 8 Each independently represents a hydrogen atom, -R x 、-NH2、-NHR x 、-NR x 2. -SR x or halogen atoms.

[0202] R xrepresents an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 12 carbon atoms.]

[0203] As the above-mentioned oxazinone coloring matter, a compound represented by formula (I-10) is preferred.

[0204] [Chemical formula 3]

[0205]

[0206] [In formula (I-10),

[0207] R 9 ~R 15 Each independently represents a hydrogen atom, -R x 、-NH2、-NHR x 、-NR x 2. -SR x or halogen atoms.

[0208] R x represents an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 12 carbon atoms.]

[0209] The acridine dye is preferably a compound represented by formula (I-11).

[0210] [Chemical formula 4]

[0211]

[0212] [In formula (I-11),

[0213] R 16 ~R 23 Each independently represents a hydrogen atom, -R x 、-NH2、-NHR x 、-NR x 2. -SR x or halogen atoms.

[0214] R x represents an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 12 carbon atoms.]

[0215] 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, toluoyl, xylyl and naphthyl.

[0216] As the cyanine dye, a compound represented by formula (I-12) and a compound represented by formula (I-13) are preferred.

[0217] [Chemical formula 5]

[0218]

[0219] [In formula (I-12),

[0220] D 1 and D 2 Each independently represents a group represented by any one of formula (I-12a) to formula (I-12d).

[0221] [Chemical formula 6]

[0222]

[0223] n5 represents an integer from 1 to 3.]

[0224] [Chemical formula 7]

[0225]

[0226] [In formula (I-13),

[0227] D 3 and D 4 Each independently represents a group represented by any one of formula (I-13a) to formula (I-13h).

[0228] [Chemical formula 8]

[0229]

[0230] n6 represents an integer from 1 to 3.]

[0231] Among these dichroic dyes, azo dyes are preferred from the viewpoint of orientation.

[0232] Regarding the content of the dichroic pigment in the light absorption anisotropic layer forming composition (the total amount when two or more are included), from the viewpoint of obtaining good light absorption characteristics, it is generally 1 mass part or more and 60 mass parts or less, preferably 1 mass part or more and 40 mass parts or less, and more preferably 1 mass part or more and 20 mass parts or less, relative to 100 mass parts of polymerizable liquid crystal compounds. When the content of the dichroic pigment is less than this range, light absorption becomes insufficient and sufficient light absorption anisotropic characteristics 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.

[0233] (Method for forming light absorption anisotropic layer)

[0234] The light absorption anisotropic layer 13 can be formed, for example, by coating a light absorption anisotropic layer forming composition on a film substrate. The light absorption anisotropic layer forming composition includes a polymerizable liquid crystal compound and a dichroic pigment, and may also include a non-liquid crystal compound having a polymerizable group, a solvent, and an additive, etc., as described later. The film substrate may be a substrate layer 11 including a resin film, or may be a resin film that does not constitute the substrate layer 11.

[0235] The coating layer formed by applying the composition for forming anisotropic light-absorbing layer is subjected to a drying treatment for removing the solvent, etc. The coating layer after the drying treatment may be irradiated with active energy rays, etc. to polymerize the polymerizable liquid crystal compound, thereby forming a light-absorbing anisotropic layer 13 as a cured layer (liquid crystal cured film) of the composition for forming anisotropic light-absorbing layer on the film substrate. The composition for forming anisotropic light-absorbing layer may be applied to the surface of the film substrate, or may be applied to the surface of the vertical alignment layer 12 formed on the surface of the film substrate.

[0236] Examples of the method for applying the light absorption 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.

[0237] The coating layer of the composition for forming anisotropic light-absorbing layer formed on the film substrate is preferably dried. When the composition for forming anisotropic light-absorbing layer contains a solvent, the solvent in the coating layer can be removed by drying the coating layer. As the drying method, known methods can be mentioned, and one or more methods of natural drying method, heating drying method, ventilation drying method, reduced pressure drying method, etc. can be mentioned.

[0238] The drying conditions in the drying process can be appropriately determined according to the components contained in the composition for forming anisotropic light-absorbing layer. For example, the drying temperature in the drying process is 50° C. to 150° C., or 60° C. to 120° C. The drying time in the drying process is 15 seconds to 10 minutes, or 0.5 minutes to 5 minutes.

[0239] When the heat treatment is performed during the drying treatment, the polymerizable liquid crystal compound contained in the light absorption anisotropic layer-forming composition may 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, thereby orienting the polymerizable liquid crystal compound while removing the solvent in the coating layer. In particular, when the polymerizable liquid crystal compound forming the smectic phase is oriented in a direction perpendicular to the surface of the light absorption anisotropic layer 13, it is preferred to heat in a temperature region that is transformed into the smectic phase. Thus, the polymerizable liquid crystal compound can be oriented in a direction perpendicular to the surface of the light absorption anisotropic layer 13, and the dichroic pigment can also be oriented along with the orientation of the polymerizable liquid crystal compound.

[0240] After drying the coating layer formed on the film substrate, 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 the light absorption anisotropic layer 13 .

[0241] 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 of a coating layer obtained by coating a light-absorbing anisotropic layer-forming composition on a film substrate. 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 aspect of easily controlling the progress of the polymerization reaction and the aspect that a device widely used in the art can be used as a photopolymerization device, ultraviolet light is preferred, and the type of polymerizable liquid crystal compound is preferably selected in a manner that can be photopolymerized using ultraviolet light.

[0242] As the light source of active energy rays, for example, there can be mentioned a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, a xenon lamp, a halogen lamp, a carbon arc lamp, a tungsten lamp, a gallium lamp, an excimer laser, an LED light source emitting light in a wavelength range of 380 to 440 nm, a chemical lamp, a black light lamp, a microwave-excited mercury lamp, a metal halide lamp, and the like.

[0243] The UV radiation intensity is usually 10mW / cm 2 ~3,000mW / cm 2The ultraviolet irradiation intensity 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 further 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 amount is below this range, the curing of the polymerizable liquid crystal compound may become insufficient. On the contrary, when the accumulated light amount is above this range, the light absorption anisotropic layer 13 may be colored.

[0244] (Non-liquid crystal compound having a polymerizable group)

[0245] A non-liquid crystal compound having a polymerizable group (hereinafter, also referred to as a "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 cited. Among them, preferred polymerizable groups are (methyl) acryloyl, (methyl) acryloyloxy, vinyloxy, oxirane, and oxetane, and 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.

[0246] The number of polymerizable groups possessed by the non-liquid crystal compound is not particularly limited, and may be, for example, 1 to 20, but from the viewpoint of further improving the film strength of the light absorption anisotropic layer, it is preferably 2 to 10, and more preferably 3 to 6. When the non-liquid crystal compound has two or more polymerizable groups, the polymerizable groups may be the same or different from each other.

[0247] As non-liquid crystal compounds, monofunctional (meth) acrylates and multifunctional (meth) acrylates can be cited. Monofunctional acrylates and multifunctional acrylates as non-liquid crystal compounds having polymerizable groups are non-liquid crystals, and therefore, are preferably compounds without a mesogenic structure. Monofunctional acrylates and multifunctional acrylates may contain a carbamate structure, an amino structure, an epoxy structure, an ethylene glycol structure, and / or a polyester structure in the molecule.

[0248] (Solvent)

[0249] The solvent that may be contained in the light absorption anisotropic layer-forming composition 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. As the solvent, for example, alcohol solvents such as methanol, ethanol, ethylene glycol, isopropanol, propylene glycol, ethylene glycol methyl ether, ethylene glycol butyl ether, and propylene glycol monomethyl ether can be cited; 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, etc. These solvents can be used alone or in combination of two or more.

[0250] The content of the solvent in the composition for forming anisotropic light-absorbing layer is preferably 50 to 98% by mass relative to the total amount of the composition for forming anisotropic light-absorbing layer. In other words, the content of the solid component in the composition for forming anisotropic light-absorbing layer is preferably 2 to 50% by mass, and more preferably 5 to 30% by mass. If the content of the solid component is 50% by mass or less, the viscosity of the composition for forming anisotropic light-absorbing layer is reduced, so that it is easy to form anisotropic light-absorbing layer with a substantially uniform thickness, and there is a tendency that unevenness is not easily generated in the anisotropic light-absorbing layer 13. The content of the solid component can be determined in consideration of the thickness of the anisotropic light-absorbing layer 13 to be manufactured.

[0251] (additive)

[0252] 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.

[0253] (Polymerization initiator)

[0254] The composition for forming anisotropic light-absorbing layer may contain a polymerization initiator. The polymerization initiator may be used when the composition for forming anisotropic light-absorbing layer contains a compound that participates in a polymerization reaction, such as a polymerizable liquid crystal compound, and is a compound that can initiate a 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 by the action of light is preferred from the viewpoint of not depending on the phase state of the thermotropic liquid crystal.

[0255] The photopolymerization initiator may be any compound capable of initiating a polymerization reaction of a polymerizable liquid crystal compound or the like, and a known photopolymerization initiator may be used. Specifically, a photopolymerization initiator capable of generating active free radicals or acids by the action of light may be mentioned, and a photopolymerization initiator capable of generating free radicals by the action of light is preferred. The photopolymerization initiator may be used alone or in combination of two or more.

[0256] 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:

[0257] Self-cleavable benzoin compounds, acetophenone compounds, hydroxyacetophenone compounds, α-aminoacetophenone compounds, oxime ester compounds, acylphosphine oxide compounds, azo compounds, etc., and,

[0258] 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.

[0259] As the photopolymerization initiator that generates an acid, iodonium salts, sulfonium salts, and the like can be used.

[0260] The photopolymerization initiator is preferably a self-cleavage type photopolymerization initiator from the viewpoint of excellent reaction efficiency at low temperatures, and is particularly preferably an acetophenone compound, a hydroxyacetophenone compound, an α-aminoacetophenone compound, or an oxime ester compound.

[0261] The content of the polymerization initiator in the composition for forming anisotropic light-absorbing layer can be appropriately adjusted according to the type and amount of the polymerizable liquid crystal compound, and 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 content of the polymerizable liquid crystal compound. If the content of the polymerization initiator is within the above range, polymerization can be performed without disturbing the orientation of the polymerizable liquid crystal compound.

[0262] (Leveling agent)

[0263] The composition for forming an anisotropic layer of light absorption may contain a leveling agent. The so-called leveling agent is an additive having the function of adjusting the fluidity of the composition for forming anisotropic layer of light absorption and making the film obtained by coating the composition for forming anisotropic layer of light absorption flatter. The composition for forming anisotropic layer of light absorption may contain a fluorine-based leveling agent such as a silicone-based leveling agent, a polyacrylate-based leveling agent, and a perfluoroalkyl-based leveling agent, preferably a silicone-based leveling agent. By making the composition for forming anisotropic layer of light absorption contain a silicone-based leveling agent, it is easy to suppress the adhesion of the anisotropic layer of light absorption. In the case where the composition for forming anisotropic layer of light absorption contains a silicone-based leveling agent, its content can be cited as the range described below as the content in the anisotropic layer of light absorption.

[0264] Silicone-based leveling agents are leveling agents containing silicon atoms, and preferably use leveling agents having a polyorganosiloxane skeleton. As groups bonded to silicon atoms (silicon atoms forming siloxane bonds) in polyorganosiloxane, 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, more preferably a methyl group and a phenyl group, and further 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 further preferably 5 to 1,000.

[0265] A commercially available silicone leveling agent 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 of which are BYK Chemie Japan As silicone leveling agents having radical polymerizable groups such as (meth)acryloyl groups added to polyether chains, BYK-UV3500, BYK-UV3505, BYK-3510, BYK-UV3530, BYK-UV3570, BYK-UV3575, BYK-UV3576 (BYK Chemie Japan KP-422, KP-416, KP-418, KP-410, KP-411, KP-412, KP-413, KP-423, KP-414, KP-415, KP-420, KP-983 (all manufactured by Shin-Etsu Chemical Co., Ltd.), etc.

[0266] Relative to 100 parts by mass of the polymer of the polymerizable liquid crystal compound contained in the light absorbing anisotropic layer 13, 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, and 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 the light absorbing anisotropic layer 13 flatly 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 the depression when the composition for forming the light absorbing anisotropic layer is applied to the film substrate. Furthermore, when a horizontal alignment layer is formed by further applying a composition for forming a horizontal alignment layer described later on the light absorption anisotropic layer 13 , the light absorption anisotropic layer 13 can be easily overcoated and unevenness can be suppressed.

[0267] (Orientation promoter)

[0268] When the composition for forming an anisotropic light-absorbing layer is directly coated on the surface of the film substrate (when a vertical alignment layer is not used), the composition for forming an anisotropic light-absorbing layer preferably contains an alignment promoter. An alignment promoter refers to a material that promotes the liquid crystal orientation of a polymerizable liquid crystal compound in a desired direction. As an alignment promoter that promotes the orientation of a polymerizable liquid crystal compound in a vertical direction, ionic compounds and nonionic silane compounds formed by non-metallic atoms can be cited. The composition for forming an anisotropic light-absorbing layer 13 preferably contains at least one of an ionic compound and a nonionic silane compound formed by non-metallic atoms, and more preferably contains both an ionic compound and a nonionic silane compound formed by non-metallic atoms.

[0269] 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 orientation 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 viewpoint of easily improving the vertical orientation control force, it is preferably a silane compound having an alkyl group at the molecular end, and more preferably a silane compound having an alkyl group with 3 to 30 carbon atoms.

[0270] When the composition for forming an anisotropic light-absorbing layer contains an ionic compound formed of non-metallic atoms, in the dried coating film of the composition for forming an anisotropic light-absorbing layer formed on the film substrate, a vertical alignment control force on the polymerizable liquid crystal compound is exhibited by electrostatic interaction, and the polymerizable liquid crystal compound tends to be aligned in a direction perpendicular to the surface of the film substrate in the dried coating film. Thus, the polymerizable liquid crystal compound can be maintained in a vertically aligned state and the light-absorbing anisotropic layer 13 as a liquid crystal cured film can be formed.

[0271] As the ionic compound formed by non-metallic atoms, for example, onium salts (more specifically, quaternary ammonium salts, tertiary sulfonium salts, and quaternary phosphonium salts with positive charges on nitrogen atoms, etc.) can be cited. Among these onium salts, from the viewpoint of further improving the vertical orientation of polymerizable liquid crystal compounds, quaternary onium salts are preferably used, and from the viewpoint of improving availability and mass production, quaternary phosphonium salts or quaternary ammonium salts are more preferably used. Onium salts can have more than two quaternary onium salt sites in the molecule, or can be oligomers or polymers.

[0272] The molecular weight of the ionic compound is preferably 100 to 10,000. If the molecular weight is within the above range, it is easy to improve the vertical alignment of the polymerizable liquid crystal compound while ensuring the coating properties of the light absorption anisotropic layer-forming composition. The molecular weight of the ionic compound is more preferably 5000 or less, and further preferably 3000 or less.

[0273] As the cationic component of the ionic compound, for example, inorganic cations and organic cations can be cited. Among them, organic cations are preferred from the perspective of not being easy to produce orientation defects of polymerizable liquid crystal compounds. As organic cations, for example, imidazolium cations, pyridinium cations, ammonium cations, sulfonium cations and phosphonium cations can be cited.

[0274] Ionic compounds usually have counter anions. As anionic components that become counter ions of the above-mentioned cationic components, for example, inorganic anions and organic anions can be cited. Among them, from the aspect of not being easy to produce the orientation defects of polymerizable liquid crystal compounds, organic anions are preferred. It should be noted that cations and anions do not necessarily correspond one to one.

[0275] Specific examples of the anion component include the following.

[0276] Chloride anion 〔Cl - 〕,

[0277] Bromide anion 〔Br - 〕,

[0278] Iodide anion -〕,

[0279] Tetrachloroaluminate anion 〔AlCl4 - 〕,

[0280] Heptachlorodialuminate anion〔Al2Cl7 - 〕,

[0281] Tetrafluoroborate anion 〔BF4 - 〕,

[0282] Hexafluorophosphate anion 〔PF6 - 〕,

[0283] Perchlorate anion 〔ClO4 - 〕,

[0284] Nitrate anion 〔NO3 - 〕,

[0285] Acetate anion 〔CH3COO - 〕,

[0286] trifluoroacetate anion 〔CF3COO - 〕,

[0287] Fluorosulfonate anion 〔FSO3 - 〕,

[0288] Methanesulfonate anion 〔CH3SO3 - 〕,

[0289] trifluoromethanesulfonate anion 〔CF3SO3 - 〕,

[0290] p-Toluenesulfonate anion 〔p-CH3C6H4SO3 - 〕,

[0291] Bis(fluorosulfonyl)imide anion〔(FSO2)2N - 〕,

[0292] Bis(trifluoromethanesulfonyl)imide anion〔(CF3SO2)2N - 〕,

[0293] Tris(trifluoromethanesulfonyl)methane anion〔(CF3SO2)3C - 〕,

[0294] Hexafluoroarsenate anion 〔AsF6 - 〕,

[0295] Hexafluoroantimonate anion 〔SbF6 - 〕,

[0296] Hexafluoroniobate anion〔NbF6 - 〕,

[0297] Hexafluorotantalate anion 〔TaF6 - 〕,

[0298] Dimethylphosphinate anion〔(CH3)2POO - 〕,

[0299] (Poly)hydrofluorofluoride anion〔F(HF) n - 〕(for example, n represents an integer from 1 to 3),

[0300] Dicyanamide anion〔(CN)2N - 〕,

[0301] SCN - 〕,

[0302] Perfluorobutanesulfonate anion 〔C4F9SO3 - 〕,

[0303] Bis(pentafluoroethanesulfonyl)imide anion〔(C2F5SO2)2N - 〕,

[0304] Perfluorobutyrate anion 〔C3F7COO-〕, and

[0305] (Trifluoromethanesulfonyl)(trifluoromethylcarbonyl)imide anion〔(CF3SO2)(CF3CO)N - 〕.

[0306] 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.

[0307] (Pyridinium salt)

[0308] N-Hexylpyridinium hexafluorophosphate,

[0309] N-Octylpyridinium hexafluorophosphate,

[0310] N-Methyl-4-hexylpyridinium hexafluorophosphate,

[0311] N-Butyl-4-methylpyridinium hexafluorophosphate,

[0312] N-octyl-4-methylpyridinium hexafluorophosphate,

[0313] N-hexylpyridinium bis(fluorosulfonyl)imide,

[0314] N-octylpyridinium bis(fluorosulfonyl)imide,

[0315] N-methyl-4-hexylpyridinium bis(fluorosulfonyl)imide,

[0316] N-butyl-4-methylpyridinium bis(fluorosulfonyl)imide,

[0317] N-octyl-4-methylpyridinium bis(fluorosulfonyl)imide,

[0318] N-hexylpyridinium bis(trifluoromethanesulfonyl)imide,

[0319] N-octylpyridinium bis(trifluoromethanesulfonyl)imide,

[0320] N-methyl-4-hexylpyridinium bis(trifluoromethanesulfonyl)imide,

[0321] N-butyl-4-methylpyridinium bis(trifluoromethanesulfonyl)imide,

[0322] N-octyl-4-methylpyridinium bis(trifluoromethanesulfonyl)imide,

[0323] N-Hexylpyridinium p-toluenesulfonate,

[0324] N-Octylpyridinium p-toluenesulfonate,

[0325] N-Methyl-4-hexylpyridinium p-toluenesulfonate,

[0326] N-butyl-4-methylpyridinium p-toluenesulfonate, and

[0327] N-octyl-4-methylpyridinium p-toluenesulfonate.

[0328] (Imidazolium salt)

[0329] 1-Ethyl-3-methylimidazolium hexafluorophosphate,

[0330] 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide,

[0331] 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide,

[0332] 1-Ethyl-3-methylimidazolium p-toluenesulfonate,

[0333] 1-Butyl-3-methylimidazolium methanesulfonate, etc.

[0334] (Pyrrolidinium salt)

[0335] N-Butyl-N-methylpyrrolidinium hexafluorophosphate,

[0336] N-butyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide,

[0337] N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide,

[0338] N-butyl-N-methylpyrrolidinium p-toluenesulfonate, and the like.

[0339] (Ammonium salt)

[0340] Tetrabutylammonium hexafluorophosphate,

[0341] Tetrabutylammonium bis(fluorosulfonyl)imide,

[0342] Tetrahexylammonium bis(fluorosulfonyl)imide,

[0343] Trioctylmethylammonium bis(fluorosulfonyl)imide,

[0344] (2-Hydroxyethyl)trimethylammonium bis(fluorosulfonyl)imide,

[0345] Tetrabutylammonium bis(trifluoromethanesulfonyl)imide,

[0346] Tetrahexylammonium bis(trifluoromethanesulfonyl)imide,

[0347] Trioctylmethylammonium bis(trifluoromethanesulfonyl)imide,

[0348] (2-Hydroxyethyl)trimethylammonium bis(trifluoromethanesulfonyl)imide,

[0349] Tetrabutylammonium p-toluenesulfonate,

[0350] Tetrahexyl ammonium p-toluenesulfonate,

[0351] Trioctylmethylammonium p-toluenesulfonate,

[0352] (2-Hydroxyethyl)trimethylammonium p-toluenesulfonate,

[0353] (2-Hydroxyethyl)trimethylammonium dimethylphosphinate,

[0354] 1-(3-Trimethoxysilylpropyl)-1,1,1-tributylammonium bis(trifluoromethanesulfonyl)imide,

[0355] 1-(3-Trimethoxysilylpropyl)-1,1,1-trimethylammonium bis(trifluoromethanesulfonyl)imide,

[0356] 1-(3-Trimethoxysilylbutyl)-1,1,1-tributylammonium bis(trifluoromethanesulfonyl)imide,

[0357] 1-(3-Trimethoxysilylbutyl)-1,1,1-trimethylammonium bis(trifluoromethanesulfonyl)imide,

[0358] N-{(3-triethoxysilylpropyl)carbamoyloxyethyl)}-N,N,N-trimethylammonium bis(trifluoromethanesulfonyl)imide, and

[0359] N-[2-{3-(3-trimethoxysilylpropylamino)-1-oxopropoxy}ethyl]-N,N,N-trimethylammonium bis(trifluoromethanesulfonyl)imide.

[0360] (Phosphonium salt)

[0361] Tributyl(2-methoxyethyl)phosphoniumbis(trifluoromethanesulfonyl)imide,

[0362] Tributylmethylphosphonium bis(trifluoromethanesulfonyl)imide,

[0363] 1,1,1-Trimethyl-1-[(trimethoxysilyl)methyl]phosphonium bis(trifluoromethanesulfonyl)imide,

[0364] 1,1,1-Trimethyl-1-[2-(trimethoxysilyl)ethyl]phosphonium bis(trifluoromethanesulfonyl)imide,

[0365] 1,1,1-Trimethyl-1-[3-(trimethoxysilyl)propyl]phosphonium bis(trifluoromethanesulfonyl)imide,

[0366] 1,1,1-Trimethyl-1-[4-(trimethoxysilyl)butyl]phosphonium bis(trifluoromethanesulfonyl)imide,

[0367] 1,1,1-tributyl-1-[(trimethoxysilyl)methyl]phosphonium bis(trifluoromethanesulfonyl)imide,

[0368] 1,1,1-tributyl-1-[2-(trimethoxysilyl)ethyl]phosphonium bis(trifluoromethanesulfonyl)imide, and

[0369] 1,1,1-tributyl-1-[3-(trimethoxysilyl)propyl]phosphonium bis(trifluoromethanesulfonyl)imide.

[0370] These ionic compounds may be used alone or in combination of two or more.

[0371] From the viewpoint of further improving the vertical alignment of the polymerizable liquid crystal compound, the ionic compound preferably has Si element and / or F element in the molecular structure of the cationic part. If the ionic compound has Si element and / or F element in the molecular structure of the cationic part, it is easy to make the ionic compound segregate on the surface of the light absorption anisotropic layer. Among them, as an ionic compound whose constituent elements are all non-metallic elements, the following ionic compounds (ii) to (iv) are preferred.

[0372] Ionic compounds (ii):

[0373] [Chemical formula 9]

[0374]

[0375] Ionic compounds (iii):

[0376] [Chemical formula 10]

[0377]

[0378] Ionic compounds (iv)

[0379] [Chemical formula 11]

[0380]

[0381] As a method for improving the vertical alignment of polymerizable liquid crystal compounds, for example, a method of treating the surface of a film substrate with a surfactant having an alkyl group with a relatively long chain length is known (for example, see Chapter 2 of "Liquid Crystal Handbook" on the Orientation and Physical Properties of Liquid Crystals (published by Maruzen Co., Ltd.)). Such a method of improving the vertical alignment of a liquid crystal compound using a surfactant can also be applied to ionic compounds. That is, by treating the surface of a film substrate with an ionic compound having an alkyl group with a relatively long chain length, the vertical alignment of a polymerizable liquid crystal compound can be effectively improved.

[0382] Specifically, the ionic compound preferably satisfies the following relationship:

[0383] 5 <M<16。

[0384] M in the above relationship is represented by the following formula.

[0385] M = (the number of covalent bonds from the positively charged atom to the molecular chain terminal of the substituent having 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)

[0386] By making the ionic compound satisfy the above relationship, the vertical alignment property of the polymerizable liquid crystal compound can be effectively improved.

[0387] When there are two or more atoms with positive charge in the molecule of the ionic compound, for a substituent containing two or more atoms with positive charge, the number of covalent bonds from the atom with positive charge regarded as the base point to the nearest other atom with positive charge is taken as the "number of covalent bonds from the atom with positive charge to the molecular chain terminal" described in the above definition of M. When the ionic compound is an oligomer or polymer having two or more repeating units, the structural unit is regarded as one molecule and the above M is calculated. When the atom with positive charge is incorporated into a ring structure, the number of covalent bonds from the atom with positive charge via the ring structure to the atom with positive charge or the number of covalent bonds to the terminal of the substituent bonded to the ring structure, whichever has a larger number of covalent bonds, is taken as the "number of covalent bonds from the atom with positive charge to the molecular chain terminal" described in the above definition of M.

[0388] When the composition for forming anisotropic light-absorbing layer contains an ionic compound, the content thereof is preferably 0.01 to 5% by mass, more preferably 0.05 to 4% by mass, and further preferably 0.1 to 3% by mass relative to the solid content of the composition for forming anisotropic light-absorbing layer. If the content of the ionic compound is within the above range, good coating properties of the composition for forming anisotropic light-absorbing layer can be maintained, and the vertical alignment of the polymerizable liquid crystal compound can be effectively promoted.

[0389] When the composition for forming an anisotropic light-absorbing layer contains a nonionic silane compound, there is a tendency that the nonionic silane compound reduces the surface tension of the composition for forming anisotropic light-absorbing layer, and in the dried coating film of the composition for forming anisotropic light-absorbing layer formed on the film substrate, the nonionic silane compound exists on the surface of the dried coating film on the side opposite to the film substrate, thereby improving the vertical alignment control force of the polymerizable liquid crystal compound, and the polymerizable liquid crystal compound is aligned in a direction perpendicular to the film substrate surface in the dried coating film. As a result, the polymerizable liquid crystal compound can be maintained in a vertically aligned state and the light-absorbing anisotropic layer 13 as a liquid crystal cured film can be formed.

[0390] The nonionic silane compound is a nonionic compound containing Si element. Examples of the nonionic silane compound include silicone polymers such as polysilane, silicone resins such as silicone oil and silicone resin, and organosilicon oligomers, organic inorganic silane compounds such as silsesquioxane and alkoxysilane (more specifically, silane coupling agents, etc.), and silane-containing compounds described in the items of leveling agents.

[0391] The nonionic silane compound may be a silicone monomer type compound or a silicone oligomer (polymer) type compound. When the silicone oligomer is represented in the form of a (monomer)-(monomer) copolymer, examples include copolymers containing a mercaptopropyl group such as 3-mercaptopropyltrimethoxysilane-tetramethoxysilane copolymer, 3-mercaptopropyltrimethoxysilane-tetraethoxysilane copolymer, 3-mercaptopropyltriethoxysilane-tetramethoxysilane copolymer, and 3-mercaptopropyltriethoxysilane-tetraethoxysilane copolymer; and copolymers containing a mercaptomethyl group such as mercaptomethyltrimethoxysilane-tetramethoxysilane copolymer, mercaptomethyltrimethoxysilane-tetraethoxysilane copolymer, mercaptomethyltriethoxysilane-tetramethoxysilane copolymer, and mercaptomethyltriethoxysilane-tetraethoxysilane copolymer. Copolymers; 3-methacryloxypropyl trimethoxysilane-tetramethoxysilane copolymer, 3-methacryloxypropyl trimethoxysilane-tetraethoxysilane copolymer, 3-methacryloxypropyl triethoxysilane-tetramethoxysilane copolymer, 3-methacryloxypropyl triethoxysilane-tetraethoxysilane copolymer, 3-methacryloxypropyl methyl dimethoxysilane-tetramethoxysilane copolymer, 3-methacryloxypropyl methyl dimethoxysilane-tetraethoxysilane copolymer, 3-methacryloxypropyl methyl diethoxysilane-tetramethoxysilane copolymer and 3-methacryloxypropyl methyl dimethoxysilane-tetramethoxysilane copolymer ethoxysilane-tetraethoxysilane copolymers; 3-acryloxypropyl trimethoxysilane-tetramethoxysilane copolymers, 3-acryloxypropyl trimethoxysilane-tetraethoxysilane copolymers, 3-acryloxypropyl triethoxysilane-tetramethoxysilane copolymers, 3-acryloxypropyl triethoxysilane-tetraethoxysilane copolymers, 3-acryloxypropyl methyldimethoxysilane-tetramethoxysilane copolymers, 3-acryloxypropyl methyldimethoxysilane-tetraethoxysilane copolymers, 3-acryloxypropyl methyldiethoxysilane-tetramethoxysilane copolymers acryloxypropyl group-containing copolymers such as 3-acryloxypropylmethyldiethoxysilane-tetraethoxysilane copolymers; vinyltrimethoxysilane-tetramethoxysilane copolymers, vinyltrimethoxysilane-tetraethoxysilane copolymers, vinyltriethoxysilane-tetramethoxysilane copolymers, vinyltriethoxysilane-tetraethoxysilane copolymers, vinylmethyldimethoxysilane-tetramethoxysilane copolymers, vinylmethyldimethoxysilane-tetraethoxysilane copolymers, vinylmethyldiethoxysilane-tetramethoxysilane copolymers, and vinylmethyldiethoxysilane-tetraethoxysilane copolymers;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, etc. These nonionic silane compounds can be used alone or in combination of two or more. Among them, from the viewpoint of further improving the adhesion with the adjacent layer, a silane coupling agent is preferred. ;

[0392] 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 terminal, and at least one alkoxysilyl or silanol group. By appropriately selecting these functional groups, it is possible to impart excellent effects such as improvement of the mechanical strength of the light absorption anisotropic layer 13, surface modification of the light absorption anisotropic layer 13, and improvement of the adhesion between the light absorption anisotropic layer 13 and the adjacent layer (for example, the substrate layer 11). From the viewpoint of adhesion, the silane coupling agent is preferably a silane coupling agent having an alkoxysilyl group and another different reactive group (for example, 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 orientation of the polymerizable liquid crystal compound and significantly obtain a tendency to promote the effect of vertical orientation. As the polar group, for example, an epoxy group, an amino group, an isocyanurate group, a thiol group, a carboxyl group and a hydroxyl group can be cited. The polar group can suitably have a substituent or a protecting group in order to control the reactivity of the silane coupling agent.

[0393] Specific examples of the silane coupling agent include vinyl trimethoxysilane, vinyl triethoxysilane, vinyl tri(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.

[0394] 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, 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.

[0395] When the composition for forming anisotropic light-absorbing layer contains a nonionic silane compound, the content thereof is preferably 0.01% to 5% by mass, more preferably 0.05% to 4% by mass, and further preferably 0.1% to 3% by mass relative to the solid content of the composition for forming anisotropic light-absorbing layer. If the content of the nonionic silane compound is within the above range, good coating properties of the composition for forming anisotropic light-absorbing layer can be maintained, and the vertical alignment of the polymerizable liquid crystal compound can be effectively promoted.

[0396] By making the composition for forming anisotropic light-absorbing layer contain both an ionic compound and a nonionic silane compound, in the dried coating film of the composition for forming anisotropic light-absorbing layer formed on the film substrate, the electrostatic interaction from the ionic compound and the surface tension reduction effect from the nonionic silane compound can facilitate the vertical alignment of the polymerizable liquid crystal compound. Thus, the polymerizable liquid crystal compound can be maintained in a vertically aligned state with higher accuracy to form the light-absorbing anisotropic layer 13 as a liquid crystal cured film.

[0397] (Reactive Additives)

[0398] The composition for forming anisotropic light-absorbing 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 preferred. It should be noted that the so-called "active hydrogen-reactive group" here refers to a group reactive to a group containing active hydrogen such as a carboxyl group (-COOH), a hydroxyl group (-OH), and 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, and the like. 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.

[0399] It is preferred that at least two active hydrogen reactive groups exist in the reactive additive. In this case, the plurality of active hydrogen reactive groups may be the same or different.

[0400] The carbon-carbon unsaturated bond possessed by the so-called 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 them, as a reactive additive, it is preferred to contain a carbon-carbon unsaturated bond as a vinyl group and / or a (meth) acrylic group. In addition, it is preferred that the active hydrogen reactive group is a reactive additive of at least one selected from the group consisting of an epoxy group, a glycidyl group, and an isocyanate group, and it is more preferred that the reactive additive has an acrylic group and an isocyanate group.

[0401] Specific examples of reactive additives include compounds having (meth) acrylic groups and epoxy groups, such as methacryloyloxy glycidyl ether and acryloxy glycidyl ether; compounds having (meth) acrylic groups and oxetane groups, such as oxetane acrylate and oxetane methacrylate; compounds having (meth) acrylic groups and lactone groups, such as lactone acrylate and lactone methacrylate; compounds having vinyl groups and oxazoline groups, such as vinyl oxazoline and isopropenyl oxazoline; oligomers of compounds having (meth) acrylic groups and isocyanate groups, such as isocyanatomethyl acrylate, isocyanatomethyl methacrylate, 2-isocyanatoethyl acrylate or 2-isocyanatoethyl methacrylate, etc. In addition, compounds having vinyl groups, vinylidene groups and acid anhydrides, such as methacrylic anhydride, acrylic anhydride, maleic anhydride or vinyl maleic anhydride, etc., can be cited. Among them, preferred are methacryloyloxy glycidyl ether, acryloyloxy glycidyl ether, isocyanate methyl acrylate, isocyanate methyl methacrylate, vinyl oxazoline, 2-isocyanate ethyl acrylate, 2-isocyanate ethyl methacrylate or the above oligomers, and particularly preferred are isocyanate methyl acrylate, 2-isocyanate ethyl acrylate or the above oligomers.

[0402] The reactive additive may be a commercially available product as it is, or may be used after purification as necessary. Examples of commercially available products include Laromer (registered trademark) LR-9000 (manufactured by BASF Corporation).

[0403] When the composition for forming a light absorption 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.

[0404] (Coating layer)

[0405] Coating layer 14 can suppress the diffusion of the dichroic pigment contained in the light absorption anisotropic layer 13, and suppress the damage of the light absorption anisotropic layer 13. Coating layer 14 can be formed by coating layer forming composition. As mentioned above, coating layer is usually a resin layer except the adhesive layer. The adhesive layer is a layer for laminating two layers formed in advance (molding), while coating layer is not a layer for laminating two layers formed in advance (molding).

[0406] The coating layer forming composition may include, for example, a layer formed of 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 an active energy ray-curable resin, etc. The water-soluble polymer generally has a polarity greatly different from that of the dichroic pigment, and thus has an excellent effect of preventing the diffusion of the dichroic pigment. Therefore, the coating layer 14 is preferably a layer formed of a resin composition containing a water-soluble polymer.

[0407] 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, water-soluble polyamide epoxy resins, etc. These polymers may be used alone or in combination of two or more.

[0408] When the coating layer 14 is a layer 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.

[0409] In the case where the coating layer 14 is a layer formed of a resin composition containing a water-soluble polymer, a cross-linking structure can be introduced by using a cross-linking agent to improve the compactness of the layer. Examples of the cross-linking agent include water-soluble cross-linking agents such as ionic bonding cross-linking agents such as glyoxylate and epoxy cross-linking agents; hydrophobic cross-linking agents such as isocyanate cross-linking agents, polyaldehyde cross-linking agents such as glyoxal and glyoxal derivatives, and metal compound cross-linking agents such as zirconium chloride or titanium lactate for the purpose of imparting water resistance.

[0410] The amount of the crosslinking agent added can be appropriately determined according to the type of the 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. If the content of the crosslinking agent is within the above range, a dense coating layer 14 can be formed.

[0411] The resin composition containing the water-soluble polymer is usually prepared as a solution obtained by dissolving the water-soluble polymer in a solvent. The solvent may be selected according to the water-soluble polymer used, and typically includes water, alcohol, and a mixture of water and alcohol, and water is preferred.

[0412] The solid content concentration of the resin composition containing a water-soluble polymer obtained by adding a solvent to the components constituting the coating layer 14, such as a water-soluble polymer and a crosslinking agent, is preferably 1 to 50% by mass, more preferably 2 to 30% by mass, and further preferably 3 to 15% by mass. If the solid content concentration of the resin composition containing a water-soluble polymer is within the above range, the viscosity of the composition becomes low, so the coating property and the workability become good.

[0413] In the resin composition containing a water-soluble polymer, in addition to a water-soluble polymer, a crosslinking agent, and a solvent such as water, other components such as additives may also be included. As other components, for example, preservatives, leveling agents, etc. may be cited. In the case where the resin composition containing a water-soluble polymer includes other components such as additives, the amount thereof is preferably less than 10% by mass, more preferably less than 5% by mass, based on the solid content of the resin composition.

[0414] A resin composition containing a water-soluble polymer prepared by dissolving necessary components such as a water-soluble polymer and a crosslinking agent in a solvent can be applied to the surface of the light-absorbing anisotropic layer 13 on the side opposite to the substrate layer 11 , and the solvent in the coating film is dried, removed, and cured to form a coating layer 14 .

[0415] The method for applying the resin composition containing the water-soluble polymer is not particularly limited, and for example, the same method as the method for applying the light absorption anisotropic layer forming composition can be cited. In addition, the surface of the light absorption anisotropic layer 13 on the side where the coating layer 14 is to be formed can be subjected to surface treatment such as corona treatment and plasma treatment.

[0416] The drying temperature, time, etc. used to form the coating layer 14 from the coating film of the resin composition containing the water-soluble polymer are not particularly limited, and can be appropriately determined according to the composition of the resin composition containing the water-soluble polymer used. The drying treatment can be carried out, for example, by blowing hot air, etc., and the temperature is usually in the range of 40 to 100°C, preferably in the range of 60 to 100°C, and more preferably in the range of 60 to 80°C. If the temperature becomes too high, it is close to the phase transition temperature of the polymerizable liquid crystal compound in the light absorption anisotropic layer 13, and there is a concern that the orientation of the polymerizable liquid crystal compound is disordered. In addition, the drying time is usually 10 to 600 seconds.

[0417] Examples of the active energy ray-curable resin contained in the photocurable composition include (meth)acrylic resins, urethane resins, (meth)acrylic urethane resins, epoxy resins, and silicone resins. The active energy ray-curable resin is preferably an epoxy resin.

[0418] The photocurable composition may be a curable composition such as the hard coating composition described in the coating resin layer constituting the substrate layer 11. The photocurable composition may also 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.

[0419] The photocurable composition can be applied to the surface of the light absorbing anisotropic layer 13 on the side opposite to the substrate layer 11 side and irradiated with active energy rays to form the coating layer 14. As described above, the surface of the light absorbing anisotropic layer 13 on the side where the coating layer 14 is to be formed can be subjected to surface treatment.

[0420] The thickness of the coating layer 14 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.

[0421] (Horizontal Alignment Layer)

[0422] The horizontal alignment layer 15 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 16 to be aligned in the horizontal direction relative to the plane of the liquid crystal polarizer 16. 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, and the so-called horizontal direction means 0°±20° relative to the plane of the liquid crystal polarizer 16. The state of liquid crystal orientation varies depending on the properties of the horizontal alignment layer 15 and the polymerizable liquid crystal compound, and their combination can be arbitrarily selected.

[0423] The horizontal alignment layer 15 may include a polymer alignment layer formed of an alignment polymer, a photo alignment layer formed of a photo alignment polymer, and a groove alignment layer having a concave-convex pattern and a plurality of grooves (grooves) on the surface of the layer. From the perspective of the accuracy and quality of the alignment angle, the horizontal alignment layer 15 is preferably a photo alignment layer. As the above-mentioned alignment layers constituting the horizontal alignment layer 15, the alignment layers described in the vertical alignment layer 12 may be mentioned.

[0424] The thickness of the horizontal alignment layer 15 is usually in the range of 10 nm to 10000 nm, preferably 10 nm to 2500 nm, more preferably 10 nm to 1000 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.

[0425] The composition for forming a horizontal alignment layer is preferably a composition for forming a photoalignment layer, and contains a photoalignment polymer, a photoalignment oligomer, or a photoalignment monomer as a polymer having a photoreactive group. The photoreactive group may be the photoreactive group described in the vertical alignment layer 12 .

[0426] The molecular weight of the photo-aligned polymer is a weight average molecular weight in terms of polystyrene determined by gel permeation chromatography (GPC), preferably 10,000 to 1,000,000, more preferably 15,000 to 20,000, more preferably 500,000 to 250,000. If the weight average molecular weight of the photo-aligned polymer is within the above range, the solvent resistance becomes good, it is easy to ensure high adhesion with the liquid crystal polarizer 16 subsequently formed on the horizontal alignment layer, and a horizontal alignment layer showing excellent liquid crystal alignment ability is obtained.

[0427] The photo-alignment polymer is further preferably a (meth)acrylic polymer. In particular, when the polymerizable liquid crystal compound forming the liquid crystal polarizer 16 has a (meth)acryloyl group as a polymerizable group, if the photo-alignment polymer is a (meth)acrylic polymer, the affinity is excellent, and it can be expected that the adhesion between the liquid crystal polarizer 16 and the horizontal alignment layer 15 can be improved. In this specification, polymers having the largest proportion of structural units based on (meth)acrylic structures, such as (meth)acrylate units and (meth)acrylamide units, among all structural units constituting the main chain of the polymer are collectively referred to as "(meth)acrylic polymers".

[0428] The content of the photo-aligned polymer in the composition for forming a horizontal alignment layer can be appropriately determined according to the type of photo-aligned polymer used, the thickness of the desired horizontal alignment layer 15, etc. As long as the photo-aligned polymer used can be completely dissolved, there is no particular limitation, and its content (concentration) is preferably 1.0 to 25.0% by mass, and more preferably 2.5 to 22.5% by mass relative to the total mass of the composition for forming a horizontal alignment layer. In the composition for forming a horizontal alignment layer, the photo-aligned polymer can 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.

[0429] The composition for forming a horizontal alignment layer may contain a compound having an active hydrogen reactive group in addition to the photo-aligned polymer (hereinafter also referred to as "compound (AH)"). In the present specification, the so-called "active hydrogen reactive group" refers to a group reactive to a group containing active hydrogen, such as a carboxyl group (-COOH), a hydroxyl group (-OH), an amino group (-NH2), a mercapto group (-SH), etc. If the horizontal alignment layer 15 is formed by a composition for forming a horizontal alignment layer containing compound (AH), it is easy to control the adhesion with the coated layer (in this embodiment, the light absorbing anisotropic layer 13 or the coating layer 14) to which the composition for forming a horizontal alignment layer is to be coated, and the adhesion between the coated layer and the horizontal alignment layer 15 can be improved.

[0430] 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 them, 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.

[0431] The number of active hydrogen-reactive groups contained in compound (AH) is 1 or more. When there are a plurality of active hydrogen-reactive groups, the plurality of active hydrogen-reactive groups may be the same or different.

[0432] The compound (AH) preferably has a group containing active hydrogen in addition to the active hydrogen reactive group. In this specification, the so-called "group containing active hydrogen" refers to a functional group containing active hydrogen. By making the compound (AH) have a group containing active hydrogen, the adhesion between the horizontal alignment layer 15 and the liquid crystal polarizer 16 can be improved.

[0433] Examples of the group containing active hydrogen include hydroxyl, carboxyl, amino, mercapto, primary amide, secondary amide, hydrazide, etc. Among them, from the viewpoint of reactivity, adhesion, etc., the compound (AH) preferably has at least one group selected from the group consisting of hydroxyl, amino, and mercapto, and preferably has at least one of amino and mercapto.

[0434] The number of active hydrogen-containing groups possessed by compound (AH) is at least 1. When there are plural active hydrogen-containing groups, the plural active hydrogen-containing groups may be the same or different.

[0435] The compound (AH) is, for example, a silane coupling agent. If a silane coupling agent is used as the compound (AH), it is easy to control the adhesion between the coating layer to be coated with the horizontal alignment layer forming composition and / or the liquid crystal polarizer 16 and the horizontal alignment layer 15. The silane coupling agent may be used alone or in combination of two or more.

[0436] As the silane coupling agent, a compound known in the art can be used. Specifically, the nonionic silane compound described as the alignment promoter that can be contained in the above-mentioned light absorption anisotropic layer-forming composition can be mentioned.

[0437] 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 amino (primary, secondary), hydroxyl and thiol, more preferably a primary amino or secondary amino, and further preferably a compound containing Si element having at least one functional group and at least one alkoxysilyl or silanol group. Amino (primary, secondary), hydroxyl and thiol have polarity, and by appropriately selecting these functional groups, the adhesion of the obtained horizontal alignment layer 15 to the liquid crystal polarizer 16 can be controlled. From such a viewpoint, the silane coupling agent preferably has an alkoxysilyl group and at least one functional group. The above functional group can suitably have a substituent or a protecting group in order to control the reactivity of the silane coupling agent. Examples of the silane coupling agent 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.

[0438] The content of the compound (AH) in the horizontal alignment layer forming composition can be appropriately determined according to the type of the 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 16, etc. With respect to 100 parts by mass of the photo-aligned 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 between the horizontal alignment layer 15 and the coated layer and / or the liquid crystal polarizer 16 can be improved.

[0439] The composition for forming a horizontal alignment layer usually contains a solvent. The solvent is not particularly limited as long as it can dissolve the components contained in the composition for forming a horizontal alignment layer. For example, water can be cited; alcohol solvents such as methanol, ethanol, ethylene glycol, isopropanol, 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; chlorine-substituted hydrocarbon solvents such as chloroform and chlorobenzene, etc. These solvents can be used alone or in combination of two or more.

[0440] The horizontal alignment layer-forming composition may contain any components other than the above-mentioned components within a range that does not significantly impair the characteristics of the horizontal alignment layer 15. Examples of such components include polymer materials and photosensitizers.

[0441] 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 15 as a photoalignment layer can be formed by the method described in the vertical alignment layer 12 using the composition for forming a horizontal alignment layer.

[0442] (Liquid crystal polarizer)

[0443] The liquid crystal polarizer 16 includes a polymer of a polymerizable liquid crystal compound and a dichroic pigment, and has an absorption axis in the horizontal direction relative to the plane of the liquid crystal polarizer 16. The liquid crystal polarizer 16 has the property of transmitting linear polarized light having a vibration plane orthogonal to the absorption axis when non-polarized light is incident. The liquid crystal polarizer 16 has an absorption axis and a transmission axis orthogonal thereto in the plane, and has the property of absorbing polarized light components parallel to the absorption axis and transmitting polarized light components parallel to the transmission axis. The liquid crystal polarizer 16 can exhibit a polarizing function by utilizing the dichroic pigment encapsulated in the polymer of the polymerizable liquid crystal compound to anisotropically absorb light.

[0444] The liquid crystal polarizer 16 is a liquid crystal cured film obtained by coating a liquid crystal polarizer forming composition on the horizontal alignment layer 15 of the optical laminate 1 to 4, and polymerizing a polymerizable liquid crystal compound in a state where the dichroic dye contained in the liquid crystal polarizer forming composition is aligned. The polymer of the dichroic dye and the polymerizable liquid crystal compound contained in the liquid crystal polarizer 16 is horizontally aligned relative to the plane of the liquid crystal polarizer 16.

[0445] The thickness of the liquid crystal polarizer 16 is preferably 0.1 μm to 5 μm, more preferably 0.3 μm to 4 μm, and further preferably 0.5 μm to 3 μm. If the thickness is smaller than this range, sometimes the necessary light absorption cannot be obtained, and if the thickness is larger than this range, there is a tendency that the alignment control force generated by the horizontal alignment layer 15 is reduced and alignment defects are easily generated.

[0446] For the liquid crystal polarizer 16, 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 plane relative to the orientation direction (dichroic ratio; A1 / A2) is preferably 7 or more, more preferably 20 or more, and further preferably 40 or more. The larger the value of the dichroic ratio, the better the absorption selectivity. Although it also depends on the type of dichroic pigment, when the liquid crystal polarizer 16 is cured in the state of the nematic liquid crystal phase, the above-mentioned dichroic ratio is about 5 to 10.

[0447] By mixing two or more dichroic pigments with different absorption wavelengths, liquid crystal polarizers 16 of various hues can be produced, and liquid crystal polarizers 16 having absorption in the entire visible light range can be produced. By producing a liquid crystal polarizer 16 with such absorption characteristics, it can be expanded to various uses.

[0448] As the dichroic pigment used in the liquid crystal polarizer 16, the dichroic pigment used in the formation of the light absorption anisotropic layer 13 can be cited. 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 showing a nematic liquid crystal phase, or a thermotropic liquid crystal compound showing a smectic liquid crystal phase. The polymerizable liquid crystal compound can also be a polymerizable liquid crystal compound used in the formation of the light absorption anisotropic layer 13.

[0449] (Protective layer)

[0450] The protective layer 17 can suppress the diffusion of the dichroic pigment contained in the liquid crystal polarizer 16 and suppress damage to the liquid crystal polarizer 16. The protective layer 17 can be a polarizing element coating layer formed by coating on the liquid crystal polarizer 16, or a polarizing element protective film laminated on the liquid crystal polarizer 16 via an adhesive layer.

[0451] The polarizing element coating layer can be formed by applying a composition for forming a polarizing element coating layer on the surface of the liquid crystal polarizer 16. As the composition, the composition described as the coating layer forming composition for forming the coating layer 14 can be cited, and the resin composition containing the water-soluble polymer mentioned above is preferably mentioned.

[0452] The thickness of the polarizing element coating layer is preferably 15 μm or less, and may be 0.1 μm to 12 μm or less, preferably 0.5 μm to 10 μm or less, and more preferably 1 μm to 5 μm or less.

[0453] The polarizing element protective film is a resin film that cannot be peeled off while maintaining the shape of the liquid crystal polarizer 16. The polarizing element protective film can use a thermoplastic resin film. The thermoplastic resin film can be surface treated (e.g., corona treated, etc.) to improve the adhesion with the polarizing element, and a thin layer such as a primer layer (also referred to as a primer layer) can also be formed.

[0454] Thermoplastic resins constituting the thermoplastic resin film are preferably transparent films, and examples thereof include cellulose resins such as cellulose triacetate; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; polyethersulfone resins; polysulfone resins; polycarbonate resins; polyamide resins such as nylon and aromatic polyamide; polyimide resins; polyolefin resins such as polyethylene, polypropylene, and ethylene-propylene copolymers; cyclic polyolefin resins having a ring system and a norbornene structure (also referred to as norbornene resins); (meth)acrylic resins; polyarylate resins; polystyrene resins; polyvinyl alcohol resins, etc. Among them, the thermoplastic resin film is preferably a cyclic polyolefin resin film, a cellulose ester resin film, a polyester resin film, or a (meth)acrylic resin film.

[0455] The polarizing element protective film can be obtained by forming a hard coating on a thermoplastic resin film. The hard coating can be formed on one side of the thermoplastic resin film or on both sides. By providing a hard coating, a thermoplastic resin film with improved hardness and scratch resistance can be made. The hard coating is, for example, a cured layer of an active energy ray-curable resin, preferably an ultraviolet-curable resin. As ultraviolet-curable resins, for example, poly (meth) acrylic resins, silicone resins, polyester resins, carbamate resins, amide resins, epoxy resins, etc. can be cited. The hard coating can contain additives to increase strength. The additives are not particularly limited, and inorganic particles, organic particles, or mixtures thereof can be cited.

[0456] The thickness of the polarizing element protective film is preferably 5 μm to 150 μm, may be 10 μm to 100 μm, or may be 10 μm to 80 μm.

[0457] (Phase difference element (first liquid crystal phase difference layer, second liquid crystal phase difference layer))

[0458] The optical layered bodies 1 to 4 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 may be a liquid crystal phase difference layer including a polymer of a polymerizable liquid crystal compound, such as the first liquid crystal phase difference layer 22 and the second liquid crystal phase difference layer 24. The phase difference element is preferably a liquid crystal phase difference layer.

[0459] When the optical layer stacks 1 to 4 constitute 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 properties shown in the following formula (4), and preferably satisfies the optical properties shown in the following formula (4), the following formula (5), and the following formula (6).

[0460] 100nm <Re(550)<160nm (4)

[0461] Re(450) / Re(550)≤1.00 (5)

[0462] 1.00≤Re(650) / Re(550) (6)

[0463] [In formulas (4) to (6),

[0464] Re(550) represents the in-plane phase difference value (in-plane retardation) of the phase difference element for light of wavelength 550 nm.

[0465] Re(450) represents the in-plane phase difference value of the phase difference element for light with a wavelength of 450 nm.

[0466] Re(650) represents the in-plane phase difference value of the phase difference element for light with a wavelength of 650 nm.

[0467] If "Re(450) / Re(550)" in the above formula (5) is greater than 1.0, the light leakage on the short wavelength side of the elliptically polarizing plate having a λ / 4 phase difference 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 phase difference value of the plurality of phase difference elements constituting the phase difference element, and adjusting the mixing ratio of the polymerizable liquid crystal compound constituting the phase difference element.

[0468] 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, 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.

[0469] Re(λ)=d×Δn(λ) (7)

[0470] [In formula (7),

[0471] Re(λ) represents the in-plane phase difference value of the phase difference element at wavelength λ[nm],

[0472] d represents the thickness of the phase difference layer,

[0473] Δn(λ) represents the birefringence of the phase difference element at wavelength λ[nm].]

[0474] The optical laminate may include a positive C plate as a phase difference element. The phase difference value Rth(550) in the thickness direction of the positive C plate at a wavelength of 550nm is usually in the range of -170nm to -10nm, preferably in the range of -150nm to -20nm, and more preferably in the range of -100nm to -40nm. If the phase difference value in the thickness direction of the positive C plate is in this range, the property of preventing reflection from an oblique direction can be further improved.

[0475] 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 the 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 poly(methyl)acrylate and poly(ethyl)acrylate, polycarbonate films, polyethersulfone films, polysulfone films, polyimide films, polyolefin films, polynorbornene films, etc. can be used, but are not limited thereto.

[0476] The thickness of the retardation layer is usually 5 μm or more and 200 μm or less, preferably 10 μm or more and 80 μm or less, and more preferably 40 μm or less.

[0477] In the case where 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 include 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 orientation layer. The liquid crystal phase difference layer exhibits a phase difference in the in-plane direction or the thickness direction.

[0478] The thickness of the liquid crystal retardation layer is preferably 0.5 μm or more and 5 μm or less, and more preferably 1 μm or more and 3 μm or less.

[0479] As a film substrate to be coated with a composition for forming a liquid crystal phase difference layer, a film substrate exemplified as a film substrate for coating a composition for forming a light absorption anisotropic layer can be cited. The film substrate can be peeled off and removed when the optical laminate 3 and 4 are made, 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 photopolymerizable groups as polymerizable groups 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 a photopolymerizable group, vinyl, vinyloxy, 1-chlorovinyl, isopropenyl, 4-vinylphenyl, acryloyloxy, methacryloyloxy, oxypropyl, oxetane, etc. can be cited. Among them, acryloyloxy, methacryloyloxy, vinyloxy, oxypropyl and oxetane are preferred, and acryloyloxy is more preferred. Regarding liquid crystal properties, it can be thermotropic liquid crystal or lyotropic liquid crystal, but thermotropic liquid crystal is preferred from the perspective of being able to perform precise film thickness control. In addition, as a phase-ordered structure in thermotropic liquid crystal, it can be nematic liquid crystal or smectic liquid crystal. In addition, it can be rod-shaped liquid crystal or disc-shaped liquid crystal. The polymerizable liquid crystal compound can be used alone or in combination of two or more.

[0480] 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 which further has birefringence in the 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, for example, the structure of the T-type liquid crystal includes a compound represented by the following formula (II).

[0481] [Chemical formula 12]

[0482]

[0483] [In formula (II),

[0484] 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 number of aromatic groups contained in the divalent group Ar is two or more, the two or more aromatic groups may be bonded to each other through a divalent bonding group such as a single bond, -CO-O-, or -O-.

[0485] G 1 and G 2 Each independently represents a divalent aromatic group or a divalent alicyclic hydrocarbon group. Here, the hydrogen atoms contained in the divalent aromatic group or the divalent alicyclic hydrocarbon group may be substituted by 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 the divalent alicyclic hydrocarbon group may be substituted by an oxygen atom, a sulfur atom or a nitrogen atom.

[0486] L 1 , L 2 , B 1 and B 2 Each is independently a single bond or a divalent linking group.

[0487] k and l each independently represent an integer of 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 Each may be the same as or different from each other.

[0488] E 1 and E 2 Each independently represents an alkanediyl group having 1 to 17 carbon atoms, wherein the hydrogen atom contained in the alkanediyl group may be substituted by a halogen atom, 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.

[0489] 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.]

[0490] G 1 and G 2Each 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 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; and particularly preferably is an unsubstituted 1,4-phenylenediyl group or an unsubstituted 1,4-trans-cyclohexanediyl group.

[0491] 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 G 1 and G 2 At least one of them is a divalent alicyclic hydrocarbon group.

[0492] 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, and R c and R d represents an alkyl group having 1 to 4 carbon atoms or a hydrogen atom. 1 and L 2 Each independently is more preferably a single bond, -O Ra2-1 -、-CH2-、-CH2CH2-、-COO R 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-.

[0493] 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 2 Each independently is more preferably a single bond, -OR a10-1 -、-CH2-、-CH2CH2-、-CO OR 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-.

[0494] 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 a symmetrical structure is obtained.

[0495] 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.

[0496] As P 1 or P 2 The polymerizable group represented by , includes epoxy, vinyl, vinyloxy, 1-chlorovinyl, isopropenyl, 4-vinylphenyl, acryloyloxy, methacryloyloxy, oxirane, and oxetanyl, etc. Among them, acryloyloxy, methacryloyloxy, vinyloxy, oxirane, and oxetanyl are preferred, and acryloyloxy is more preferred.

[0497] Ar preferably has at least one selected from an aromatic hydrocarbon ring that may have a substituent, an aromatic heterocycle that may have a substituent, and an electron-withdrawing group. As the aromatic hydrocarbon ring, for example, benzene ring, naphthalene ring, anthracene ring, etc. can be cited, 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 cited. Among them, preferably have thiazole ring, benzothiazole ring or benzofuran ring, further preferably have benzothiazolyl. In addition, when Ar contains a nitrogen atom, the nitrogen atom preferably has π electrons.

[0498] 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 further preferably 24 or less.

[0499] As the aromatic group represented by Ar, for example, the following groups are preferably mentioned.

[0500] [Chemical formula 13]

[0501]

[0502] [In formula (Ar-1) to formula (Ar-23),

[0503] The symbol * indicates a connection part.

[0504] 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.

[0505] 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.

[0506] J 1 , and J 2 Each independently represents a carbon atom or a nitrogen atom.

[0507] Y 1 , Y 2 and Y 3 Each independently represents an aromatic hydrocarbon group or an aromatic heterocyclic group which may be substituted.

[0508] W 1 and W 2 Each independently represents a hydrogen atom, a cyano group, a methyl group or a halogen atom.

[0509] m represents an integer from 0 to 6.]

[0510] As Y 1 , Y 2 and Y 3 The aromatic hydrocarbon group in the group includes an aromatic hydrocarbon group having 6 to 20 carbon atoms, such as phenyl, naphthyl, anthracenyl, phenanthrenyl, biphenyl, etc., preferably phenyl and naphthyl, more preferably phenyl. The aromatic heterocyclic group includes an aromatic heterocyclic group having 4 to 20 carbon atoms, such as furanyl, pyrrolyl, thienyl, pyridyl, thiazolyl, benzothiazolyl, etc., which contains at least one hetero atom such as nitrogen atom, oxygen atom, sulfur atom, etc., preferably furanyl, thienyl, pyridyl, thiazolyl, benzothiazolyl.

[0511] Y 1 , Y 2 and Y 3 Each independently may be a substituted polycyclic aromatic hydrocarbon group or a polycyclic aromatic heterocyclic group. The polycyclic aromatic hydrocarbon group refers to a condensed polycyclic aromatic hydrocarbon group or a group derived from an aromatic ring collection. The polycyclic aromatic heterocyclic group refers to a condensed polycyclic aromatic heterocyclic group or a group derived from an aromatic ring collection.

[0512] Z 0 , Z 1 and Z 2 Each of Z is independently preferably a hydrogen atom, a halogen atom, an alkyl group having 1 to 12 carbon atoms, a cyano group, a nitro group, or 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. 1 and Z 2 More preferred are a hydrogen atom, a fluorine atom, a chlorine atom, a methyl group and a cyano group.

[0513] Q 1 and Q 2 Preferred are -NH-, -S-, -NR 2’-、-O-,R 2’ A hydrogen atom is preferred, and -S-, -O-, and -NH- are particularly preferred.

[0514] 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.

[0515] In the compounds represented by formula (Ar-16) to (Ar-23), Y 1 The nitrogen atom and Z to which it can be bonded 0 Together, they form an aromatic heterocyclic group. Examples of the aromatic heterocyclic group include the aromatic heterocyclic rings that Ar may have and are described above, for example, 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, a pyrrolidine ring, etc. 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.

[0516] Among the polymerizable liquid crystal compounds, compounds with 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 containing 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, it is advantageous from the perspective of the long-term stability of the composition for forming a liquid crystal phase difference layer, and the orientation and uniformity of the film thickness of the liquid crystal phase difference layer can be improved. 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 chloroform and the like can be cited as examples.

[0517] The content of the polymerizable liquid crystal compound in the composition for forming a liquid crystal phase difference 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 further 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 phase difference 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 obtained liquid crystal cured film.

[0518] 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 makes it present a horizontal orientation as an orientation control force, the polymerizable liquid crystal compound can form a horizontal orientation or a mixed orientation, and 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 oriented with the plane of the liquid crystal phase difference layer as a reference. For example, the so-called vertical orientation refers to the long axis of the polymerizable liquid crystal compound 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 an orientation layer, the orientation layer described in the above-mentioned vertical orientation layer and horizontal orientation layer can be cited.

[0519] (First adhesive layer, second adhesive layer, adhesive layer)

[0520] The first tackiness adhesive layer 21, the second tackiness adhesive layer 23, and tackiness adhesive layers other than the first tackiness adhesive layer 21 and the second tackiness adhesive layer 23 (hereinafter, these are collectively referred to as "tackiness adhesive layers") that can be used in the optical laminates 1 to 4 are tackiness adhesive layers or adhesive layers.

[0521] The adhesive layer can be formed using an adhesive composition. An adhesive composition or a reaction product of an adhesive composition is a substance that exhibits adhesiveness by attaching itself to an adherend, and is called a so-called pressure-sensitive adhesive. In addition, an adhesive layer formed using an active energy ray-curable adhesive composition described later can be adjusted in crosslinking degree and adhesive strength by irradiating active energy rays.

[0522] As adhesive composition, adhesives with excellent optical transparency known in the past can be used without particular limitation, for example, adhesive compositions containing base polymers such as acrylic polymers, carbamate polymers, silicone polymers, polyvinyl ethers can be used. In addition, adhesive composition can be active energy ray curing adhesive composition or heat curing adhesive composition etc. Among them, adhesive compositions using acrylic resins excellent in transparency, adhesion, re-peelability (reoperability), weatherability, heat resistance etc. as base polymers are preferred. The adhesive layer is preferably composed of the reaction product of the adhesive composition comprising (meth) acrylic resin, crosslinking agent, silane compound, and may also include other components.

[0523] The adhesive composition for forming the adhesive layer can include base polymers such as acrylic polymers, urethane polymers, silicone polymers, polyvinyl ethers, etc. The adhesive composition can be an active energy ray-curable adhesive, a thermosetting adhesive, etc. Among them, an adhesive using a (meth) acrylic resin having excellent transparency, adhesion, re-peelability (re-operability), weather resistance, heat resistance, etc. as a base polymer is preferred. The adhesive layer is preferably composed of a reaction product of an adhesive comprising a (meth) acrylic resin, a crosslinking agent, and a silane compound, and may also include other components.

[0524] The adhesive layer can be formed using an active energy ray-curable adhesive. For active energy ray-curable adhesives, a harder adhesive layer can be formed by adding an ultraviolet curable compound such as a multifunctional acrylate to the above-mentioned adhesive composition and curing it by irradiating ultraviolet rays after forming the adhesive layer. Active energy ray-curable adhesives have the property of being cured by irradiation with energy rays such as ultraviolet rays and electron beams. Active energy ray-curable adhesives also have adhesiveness before energy ray irradiation, and therefore have the property of being able to fit closely to an adherend, being cured by irradiation with energy rays, and adjusting the adhesion.

[0525] The thickness of the adhesive layer is not particularly limited, and is usually 5 μm to 300 μm, 10 μm to 250 μm, 15 μm to 100 μm, or 20 μm to 50 μm.

[0526] The adhesive layer can be formed using an adhesive composition. The adhesive composition used to form the adhesive layer is an adhesive other than a pressure-sensitive adhesive (adhesive), and examples thereof include a water-based adhesive and an active energy ray-curable adhesive.

[0527] Examples of the water-based adhesive include an adhesive obtained by dissolving or dispersing a polyvinyl alcohol resin in water. The drying method when using the water-based adhesive is not particularly limited, and for example, a method of drying using a hot air dryer or an infrared dryer may be used.

[0528] Examples of active energy ray-curable adhesives include solvent-free active energy ray-curable adhesives containing curable compounds that are cured by irradiation with active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays. By using solvent-free active energy ray-curable adhesives, interlayer adhesion can be improved.

[0529] The thickness of the adhesive layer is preferably 0.1 μm or more, and may be 0.5 μm or more, and is preferably 10 μm or less, and may be 5 μm or less.

[0530] (Application of optical laminate)

[0531] The optical laminates 1 to 4 can be applied to display devices. 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 the light absorption anisotropic layer 13, the liquid crystal polarizer 16, and the 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.

[0532] Example

[0533] The present invention will be described in more detail below by showing Examples and Comparative Examples, but the present invention is not limited to these Examples. Unless otherwise specified, "%" and "part" in Examples and Comparative Examples are mass % and mass parts.

[0534] [Preparation of base material layer]

[0535] (Substrate layer: TAC film 1 (25TAC))

[0536] A triacetyl cellulose (TAC) film ("KC2UA-TAC" manufactured by Konica Minolta Co., Ltd.) was prepared.

[0537] [Preparation of Composition for Forming Light Absorption Anisotropic Layer]

[0538] (Preparation of Composition (1) for Forming Light Absorption Anisotropic Layer)

[0539] The components shown below were mixed and stirred at 80° C. for 1 hour to obtain a composition (1) for forming a light absorption anisotropic layer.

[0540] Polymerizable liquid crystal compound (1): 75 parts

[0541] Polymerizable liquid crystal compound (2): 25 parts

[0542] Dichroic pigment (azo pigment) (1): 1.2 parts

[0543] Dichroic dye (azo dye) (2): 1.7 parts

[0544] Polymerization initiator (2-dimethylamino-2-benzyl-1-(4-morpholinophenyl)butan-1-one (Irgacure 369, manufactured by BASF): 6 parts

[0545] Leveling agent (BYK-333, manufactured by BYK-Chemie): 0.25 parts

[0546] Solvent (o-xylene): 670 parts

[0547] 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).

[0548] ·Polymerizable liquid crystal compound (1):

[0549] [Chemical formula 14]

[0550]

[0551] Polymerizable liquid crystal compound (2):

[0552] [Chemical formula 15]

[0553]

[0554] As the dichroic dyes (1) and (2), an azo dye having the structure shown below was used.

[0555] Dichroic pigments (1):

[0556] [Chemical formula 16]

[0557]

[0558] Dichroic pigments (2):

[0559] [Chemical formula 17]

[0560]

[0561] (Preparation of Composition for Forming Light Absorption Anisotropic Layer (2))

[0562] The components shown below were mixed and stirred at 80° C. for 1 hour to obtain a composition (2) for forming a light absorption anisotropic layer.

[0563] Polymerizable liquid crystal compound (1): 75 parts

[0564] Polymerizable liquid crystal compound (2): 25 parts

[0565] Dichroic pigment (azo pigment) (1): 1.2 parts

[0566] Dichroic dye (azo dye) (2): 1.7 parts

[0567] Polymerization initiator (2-dimethylamino-2-benzyl-1-(4-morpholinophenyl)butan-1-one (Irgacure 369, manufactured by BASF): 6 parts

[0568] Leveling agent (BYK-333, manufactured by BYK-Chemie): 0.25 parts

[0569] Non-liquid crystal compound having a polymerizable group (dipentaerythritol hexaacrylate (6-functional)): 1.5 parts

[0570] Reactive additive (Laromer (registered trademark) LR-9000, manufactured by BASF): 2 parts

[0571] Solvent (o-xylene): 670 parts

[0572] The reactive additive includes a compound having the structure shown below.

[0573] [Chemical formula 18]

[0574]

[0575] [Preparation of Composition for Forming Horizontal Alignment Layer]

[0576] (Synthesis of Oriented Polymer)

[0577] According to the synthesis route shown below, an oriented polymer composed of the structural unit represented by formula (1-1-1) (hereinafter also referred to as "oriented polymer (1-1-1)") was synthesized.

[0578] [Chemical formula 19]

[0579]

[0580] (Synthesis of the compound represented by formula (a1-1-1))

[0581] Dissolve 50 g (258 mmol) of ferulic acid in 360 g of methanol. Add 10 g of sulfuric acid to the resulting solution at room temperature, raise the temperature to reflux the solvent, and react under reflux for 2 hours. After cooling the resulting reaction solution, add 150 g of ice and 150 g of water. Remove the supernatant by decantation, and further add 150 g of water at 5°C to crystallize it. Filter the obtained white crystals. After further washing the filtered white crystals with 1 M sodium bicarbonate aqueous solution and water, vacuum dry them to obtain 22.2 g of the compound represented by formula (a1-1-1) (hereinafter also referred to as "compound (a1-1-1)".). The yield is 83% based on ferulic acid.

[0582] (Synthesis of the compound represented by formula (b1-1-1))

[0583] 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 were 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)".).

[0584] (Synthesis of the compound represented by formula (c1-1-1))

[0585] 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 stirred at 80°C for 1 hour. The reaction solution was cooled to about 3°C, and then, while keeping 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 further washing twice with a mixed solution of 100 g of water and 80 g of methanol, vacuum drying was performed 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).

[0586] (Synthesis of Compound Represented by Formula (M1-1-1))

[0587] Dissolve 27.46 g (93 mmol) of compound (c1-1-1) in 280 g of chloroform. Add 2.06 g of BHT (di-tert-butylhydroxytoluene) and 37.73 g (373 mmol) of triethylamine as polymerization inhibitors to the obtained solution, and stir under ice cooling. Add 29.26 g (260 mmol) of methacryloyl chloride to the reaction solution, keep it below 5°C, and stir for 5 hours. Add 5.7 g of dimethylaminopyridine and 190 g of water to the obtained reaction solution, and stir at room temperature for 12 hours. After standing, recover the organic layer, add 100 g of 2N hydrochloric acid aqueous solution to the organic layer, stir, stand and separate the liquids. This series of washing operations are repeated twice. Recover the organic layer, add 300 g of n-heptane, and filter out the precipitated crystals. After washing twice with a mixed solvent consisting 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 was 65% based on compound (c1-1-1).

[0588] (Synthesis of Oriented Polymer (1-1-1))

[0589] Add 1.00 g (2.76 mmol) of compound (M1-1-1) and 10 g of tetrahydrofuran to a Schlenk tube. After deoxygenation, add 2.27 mg of azobisisobutyronitrile (AIB N) while circulating nitrogen, and stir at 60°C for 72 hours. The resulting reaction solution is added to 200 g of toluene. The precipitate is filtered, washed with heptane, and then vacuum dried to obtain 0.75 g of oriented polymer (1-1-1). The yield is 75% based on compound (M1-1-1). According to GPC measurement, the number average molecular weight of the obtained oriented polymer (1-1-1) is 28200, the weight average molecular weight is about 51300, the Mw / Mn is 1.82, and the monomer content is 0.5%.

[0590] (Preparation of Composition for Forming Horizontal Alignment Layer (1))

[0591] 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.

[0592] (Preparation of Composition for Forming Horizontal Alignment Layer (2))

[0593] 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.

[0594] [Preparation of Liquid Crystal Polarizer Forming Composition]

[0595] (Preparation of Liquid Crystal Polarizer Forming Composition (1))

[0596] 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.

[0597] Polymerizable liquid crystal compound (1): 75 parts

[0598] Polymerizable liquid crystal compound (2): 25 parts

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

[0600] Dichroic dye (azo dye) (4): 2.8 parts

[0601] Dichroic pigment (azo pigment) (5): 2.8 parts

[0602] Polymerization initiator (2-dimethylamino-2-benzyl-1-(4-morpholinophenyl)butan-1-one (Irgacure 369, manufactured by BASF)): 6 parts

[0603] Leveling agent (polyacrylate compound (BYK-361N, manufactured by BYK-Chemie): 1.2 parts

[0604] Solvent (cyclopentanone): 250 parts

[0605] The structures and synthesis methods of the polymerizable liquid crystal compounds (1) and (2) are as described above.

[0606] As the dichroic dyes (3) to (5), azo dyes having the structures shown below were used.

[0607] Dichroic pigments (3):

[0608] [Chemical formula 20]

[0609]

[0610] Dichroic pigments (4):

[0611] [Chemical formula 21]

[0612]

[0613] Dichroic pigments (5):

[0614] [Chemical formula 22]

[0615]

[0616] (Preparation of Liquid Crystal Polarizer Forming Composition (2))

[0617] 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.

[0618] Polymerizable liquid crystal compound (1): 75 parts

[0619] Polymerizable liquid crystal compound (2): 25 parts

[0620] Dichroic dye (azo dye) (3): 2.8 parts

[0621] Dichroic dye (azo dye) (4): 2.8 parts

[0622] Dichroic pigment (azo pigment) (5): 2.8 parts

[0623] Polymerization initiator (2-dimethylamino-2-benzyl-1-(4-morpholinophenyl)butan-1-one (Irgacure 369, manufactured by BASF)): 6 parts

[0624] Leveling agent (polyacrylate compound (BYK-361N, manufactured by BYK-Chemie): 1.2 parts

[0625] Reactive additive (Laromer (registered trademark) LR-9000, manufactured by BASF): 2 parts

[0626] Solvent (cyclopentanone): 250 parts

[0627] The structures and synthesis methods of the polymerizable liquid crystal compounds (1) and (2), and the structure of the reactive additive are as described above.

[0628] [Preparation of a resin composition containing a water-soluble polymer]

[0629] To 100 parts of water were added 3 parts of carboxyl-modified polyvinyl alcohol (KURARAY POVAL KL 318, manufactured by KURARAY) and 1.5 parts of a water-soluble polyamide epoxy resin (Sumire z 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.

[0630] [Preparation of coating layer forming composition]

[0631] (Preparation of Hard Coat Composition)

[0632] The following components were mixed and stirred at 80° C. for 1 hour to prepare a hard coating composition.

[0633] Acrylate compound (dipentaerythritol hexaacrylate): 50 parts

[0634] Urethane acrylate compound (urethane acrylate (manufactured by DAICEL Allnex Co., Ltd., "EBECRYL 4858")): 50 parts

[0635] Radical polymerization initiator (2-[4-(methylthio)benzoyl]-2-(4-morpholinyl)propane (manufactured by BASF, "Irgacure 907")): 3 parts

[0636] Solvent (methyl ethyl ketone): 10 parts

[0637] (Preparation of cationically curable composition)

[0638] The following components were mixed and degassed to prepare a cationically curable composition. The photocationic polymerization initiator was blended in the form of a 50% propylene carbonate solution, and the amount thereof is expressed as a solid content.

[0639] Cationic polymerizable compound (1) [3-ethyl-3{[(3-ethyloxetan-3-yl)methoxy]methyl}oxetane (trade name: OXT-221, manufactured by Toagosei Co., Ltd.)]: 60.0 parts

[0640] Cationic polymerizable compound (2) [3',4'-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate (trade name: CEL2021P, manufactured by Daicel Corporation)]: 32.5 parts

[0641] Cationic polymerizable compound (3) [1,2-epoxy-4-(2-oxacyclopropyl)cyclohexane adduct of 2,2-bis(hydroxymethyl)-1-butanol (trade name: EHPE3150, manufactured by Daicel Corporation)]: 7.5 parts

[0642] Photocationic polymerization initiator [CPI-100P (San-Apro Co., Ltd., 50 mass % solution)]: 2.3 parts

[0643] Photosensitizer [9,10-dibutoxyanthracene]: 1.0 part

[0644] Photosensitizing agent [1,4-diethoxynaphthalene]: 1.0 part

[0645] [Preparation of the first liquid crystal phase difference layer]

[0646] (Preparation of Composition for Forming Horizontal Alignment Layer (3))

[0647] 5 parts of a photo-alignment material having the structure shown below (weight average molecular weight: 30,000) and 95 parts of cyclopentanone (solvent) were mixed, and the obtained mixture was stirred at 80° C. for 1 hour to prepare a composition (3) for forming a horizontal alignment layer.

[0648] Photo-oriented materials:

[0649] [Chemical formula 23]

[0650]

[0651] (Preparation of Liquid Crystal Retardation Layer Forming Composition (1))

[0652] The polymerizable liquid crystal compound (3) and the polymerizable liquid crystal compound (4) having the structures shown below were prepared respectively. The polymerizable liquid crystal compound (3) was prepared according to the method described in Japanese Patent Application Publication No. 2010-31223. The polymerizable liquid crystal compound (4) was prepared according to the method described in Japanese Patent Application Publication No. 2009-173893.

[0653] Polymerizable liquid crystal compound (3):

[0654] [Chemical formula 24]

[0655]

[0656] Polymerizable liquid crystal compound (4):

[0657] [Chemical formula 25]

[0658]

[0659] 1 mg of the polymerizable liquid crystal compound (3) was dissolved in 50 mL of tetrahydrofuran to obtain a solution. The obtained solution was placed in a measuring cuvette with an optical path length of 1 cm as a measuring sample, and the measuring sample was placed in an ultraviolet visible spectrophotometer (UV-2450, manufactured by Shimadzu Corporation), and the absorption spectrum was measured. The wavelength of the maximum absorbance was read from the obtained absorption spectrum, and the maximum absorption wavelength λmax in the range of 300 to 400 nm was 350 nm.

[0660] The polymerizable liquid crystal compound (3) and the polymerizable liquid crystal compound (4) are mixed in a mass ratio of 90:10 to obtain a mixture. 0.1 parts of a leveling agent (BYK-361N, manufactured by BM Chemie) and 6 parts of 2-dimethylamino-2-benzyl-1-(4-morpholinophenyl)butane-1-one (Irgacure (registered trademark) 369 (Irg369), manufactured by BASF Japan Co., Ltd.) as a photopolymerization initiator are added to 100 parts of the obtained mixture. Furthermore, N-methyl-2-pyrrolidone (NMP) is added in such a way that the solid content concentration becomes 13%. The mixture is stirred at 80°C for 1 hour to prepare a composition (1) for forming a liquid crystal phase difference layer.

[0661] (Fabrication of the First Liquid Crystal Retardation Layer)

[0662] A cycloolefin (COP) film (ZF-15-40 manufactured by Zeon Co., Ltd.) was subjected to a corona treatment and then coated with the horizontal alignment layer forming composition (3) using a bar coater. The film was dried at 80°C for 1 minute and then irradiated with a polarized UV light device (SPOTCURE SP-9 manufactured by USHIO INC.) at a wavelength of 313 nm with a cumulative light intensity of 100 mJ / cm 2 Polarized UV light exposure was performed to obtain a horizontal alignment layer (r1) for the first liquid crystal retardation layer.

[0663] Next, the composition for forming a liquid crystal phase difference layer (1) was applied onto the horizontal alignment layer (r1) using a bar coater, and after heating at 120°C for 60 seconds, ultraviolet rays (in a nitrogen atmosphere, cumulative light intensity at a wavelength of 365 nm: 500 mJ / cm) were irradiated from the surface coated with the composition for forming a liquid crystal phase difference layer (1) using a high-pressure mercury lamp (Unique VB-15201BY-A, manufactured by USHIO INC.) 2 ) to form a liquid crystal cured film. Thus, a first retardation film having a layer structure of COP film / first liquid crystal retardation layer (horizontal alignment layer (r1) / liquid crystal cured film) was obtained.

[0664] For the first retardation film, Re(450) and Re(550) were measured using KOBRA-WPR manufactured by Oji Instruments Co., Ltd., and α=Re(450) / Re(550) was calculated. As a result, α was 0.92. It was confirmed that the COP film used in the first retardation film had no phase difference, so α of the first retardation film was α of the first liquid crystal retardation layer.

[0665] [Preparation of the Second Liquid Crystal Retardation Layer]

[0666] (Preparation of Liquid Crystal Retardation Layer Forming Composition (2))

[0667] To 100 parts of polymerizable liquid crystal compound (5) (Paliocolor LC242, manufactured by BASF), 0.1 parts of F-556 as a leveling agent and 3 parts of Irgacure 369 as a polymerization initiator were added. Cyclopentanone was added so that the solid content concentration became 13% to obtain a composition (2) for forming a liquid crystal retardation layer.

[0668] (Production of the Second Liquid Crystal Retardation Layer)

[0669] A cycloolefin (COP) film (ZF-15-40 manufactured by Zeon Co., Ltd.) was subjected to a corona treatment. The liquid crystal phase difference layer forming composition (2) was applied to the corona treated surface of the COP film and then dried for 1 minute in a drying oven set at 100°C. Then, 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 liquid crystal cured film in which the polymerizable liquid crystal compound is vertically oriented relative to the coating plane. Thus, a second retardation film having a layer structure of COP film / second liquid crystal retardation layer (liquid crystal cured film) is obtained.

[0670] In order to confirm the orientation state of the polymerizable liquid crystal compound in the second liquid crystal phase difference layer, the phase difference value Rth in the thickness direction of the second phase difference film was measured using a phase difference measuring device (KOBRA-WPR, manufactured by Prince Instruments Co., Ltd.). It was confirmed that the COP film used in the second phase difference film has no phase difference. In the measurement, the incident angle of light into the second liquid crystal phase difference layer was changed, and the front phase difference value and the phase difference value when it was tilted 40° around the fast axis were measured. The average refractive index at each wavelength was measured using an ellipsometer M-220 manufactured by Nippon Spectroscopy Corporation. In addition, the thickness of the second liquid crystal phase difference layer was measured using an Optical NanoGauge film thickness meter C12562-01 (manufactured by Hamamatsu Photonics Co., Ltd.).

[0671] The three-dimensional refractive index was calculated based on the front phase difference value measured above, the phase difference value when it is tilted 40° around the fast axis, the average refractive index, and the thickness of the second phase difference layer, with reference to the Oji Instruments technical data (https: / / oji-keisoku.co.jp / support / download / index.php). From the obtained three-dimensional refractive index, the phase difference value Rth(λ) in the thickness direction at the wavelength λ[nm] of the second liquid crystal phase difference layer was calculated according to the following formula.

[0672] Rth(λ)

[0673] =((nx(λ)+ny(λ)) / 2-nz(λ))×d2

[0674] [Wherein,

[0675] nx(λ) represents the principal refractive index at a wavelength λ nm in the plane of the second liquid crystal retardation layer.

[0676] Ny(λ) represents a refractive index at a wavelength λ [nm] in a direction perpendicular to nx(λ) in the same plane as nx(λ).

[0677] nz(λ) represents the refractive index of the second liquid crystal retardation layer at a wavelength λ [nm] in the thickness direction. When nx(λ)=ny(λ), nx(λ) can be set to the refractive index in any direction within the plane of the second retardation layer.

[0678] d2 represents the thickness of the second liquid crystal phase difference layer.]

[0679] As a result, Rth(550) of the second liquid crystal retardation layer was -70 nm, and Rth(450) / Rth(550) was 1.10.

[0680] [Preparation of Adhesive Layer]

[0681] As the adhesive layer, an acrylic pressure-sensitive adhesive having a thickness of 20 μm (manufactured by LINTEC) was prepared.

[0682] [Example 1]

[0683] (Production of Light Absorption Anisotropic Layer (1))

[0684] The substrate layer (25TAC) was subjected to a corona treatment once 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 (1) was applied to the corona-treated surface of the substrate layer using a bar coater, and then dried for 1 minute in a drying oven set at 100° C. Next, 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 the result was 1 μm.

[0685] (Production of optical layered body (1))

[0686] The surface of the light-absorbing anisotropic layer (1) opposite to the substrate layer side was subjected to a corona treatment once 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 horizontal alignment layer-forming composition (1) 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 then irradiated with a polarized UV light device (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 amount of , thereby forming a horizontal alignment layer (1). The thickness of the obtained horizontal alignment layer (1) was measured by an ellipsometer M-220 (manufactured by JASCO Corporation) and found to be 40 nm.

[0687] The composition for forming a liquid crystal polarizer (1) was applied onto the horizontal alignment layer (1) using a bar coater and then dried in a drying oven set to 120° C. for 1 minute. Then, ultraviolet rays (under a nitrogen atmosphere, wavelength: 365 nm, cumulative light intensity at a wavelength of 365 nm: 1000 mJ / cm) were irradiated using a high-pressure mercury lamp (Unicure VB-15201BY-A, manufactured by USHIO INC.) 2 ), thereby forming a liquid crystal polarizer (1) in which the polymerizable liquid crystal compound and the dichroic dye were horizontally oriented. The thickness of the liquid crystal polarizer (1) was measured by an ellipsometer and found to be 2 μm.

[0688] The surface of the liquid crystal polarizer (1) opposite to the horizontal alignment layer (1) side was subjected to a corona treatment once 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. A resin composition containing a water-soluble polymer was applied to the corona-treated surface of the liquid crystal polarizer (1) using a rod coater and dried at 100° C. for 2 minutes to form a protective layer with a thickness of 1 μm. Thus, an optical laminate (1) having a layer structure of substrate layer / light absorption anisotropic layer (1) / horizontal alignment layer (1) / liquid crystal polarizer (1) / protective layer was obtained.

[0689] (Manufacturing of Elliptical Polarizing Plate (1))

[0690] On the protective layer side of the optical laminate (1), the first phase difference film is laminated in such a manner that the first liquid crystal phase difference layer side becomes the adhesive layer side using the adhesive layer prepared above. Then, the horizontal alignment layer (r1) is peeled off from the first phase difference film together with the COP film. On the first liquid crystal phase difference layer exposed by the peeling, the second phase difference film is laminated in such a manner that the second liquid crystal phase difference layer side becomes the adhesive layer side using the adhesive layer prepared above, thereby obtaining an elliptically polarizing plate (1) as an optical laminate. The layer structure of the elliptically polarizing plate (1) is substrate layer / light absorption anisotropic layer (1) / horizontal alignment layer (1) / liquid crystal polarizer (1) / protective layer / adhesive layer / first liquid crystal phase difference layer (liquid crystal cured film) / adhesive layer / second liquid crystal phase difference layer (liquid crystal cured film) / COP film.

[0691] [Examples 2 to 4]

[0692] Optical layered products (2) to (4) were prepared by the same procedure as in Example 1 except that the compositions listed in Table 1 were used as the light absorption anisotropic layer-forming composition and the liquid crystal polarizer-forming composition, and elliptically polarizing plates (2) to (4) were prepared using the same procedures as in Example 1.

[0693] [Example 5]

[0694] A light absorption anisotropic layer (2) was formed on the substrate layer (25TAC) by the same procedure as in Example 1 except that the composition described in Table 1 was used as the composition for forming a light absorption anisotropic layer.

[0695] (Production of optical laminate (5) and elliptically polarizing plate (5))

[0696] The surface of the light-absorbing anisotropic layer (2) opposite to the substrate layer side was subjected to a corona treatment once using a corona treatment device (AGF-B10, manufactured by Kasuga Electric Co., Ltd.) at an output power 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 (2) using a rod coater and dried at 100° C. for 2 minutes to form a polymer film. The thickness of the obtained polymer film was measured using an ellipsometer M-220 (manufactured by JASCO Corporation) and the result was 200 nm. The surface of the polymer film was subjected to a rubbing treatment to form a horizontal orientation layer (2). The friction treatment was performed using a semi-automatic friction device (LQ-008, manufactured by Choyo Kogaku Co., Ltd.) and a cloth (YA-20-RW, manufactured by Yoshikawa Chemical Industry Co., Ltd.) at a pressure of 0.15 mm, a rotation speed of 500 rpm, and a speed of 16.7 mm / s.

[0697] An optical laminate (5) was prepared by the same steps as in Example 1 except that a composition for forming a liquid crystal polarizer (2) was applied on the horizontal alignment layer (2) using a bar coater, and an elliptically polarizing plate (5) was prepared using the same steps as in Example 1. The layer structure of the optical laminate (5) is substrate layer / light absorption anisotropic layer (2) / horizontally aligned layer (2) / liquid crystal polarizer (3) / protective layer. The layer structure of the elliptically polarizing plate (5) is substrate layer / light absorption anisotropic layer (2) / horizontally aligned layer (2) / liquid crystal polarizer (3) / protective layer / adhesive layer / first liquid crystal phase difference layer (liquid crystal cured film) / adhesive layer / second liquid crystal phase difference layer (liquid crystal cured film) / COP film.

[0698] [Example 6]

[0699] An optical laminate (6) was prepared by the same steps as in Example 1, except that the compositions listed in Table 1 were used as the light absorption anisotropic layer-forming composition, the horizontal alignment layer-forming composition, and the liquid crystal polarizer-forming composition, and an elliptically polarizing plate (6) was prepared using the same composition.

[0700] [Example 7]

[0701] A light absorbing anisotropic layer (2) was formed on the substrate layer (25TAC) by the same procedure as in Example 1 except that the composition listed in Table 1 was used as the composition for forming the light absorbing anisotropic layer. The surface of the light absorbing anisotropic layer (2) opposite to the substrate layer side was subjected to a corona treatment by the same procedure as in Example 5 to form a polymer film as a coating layer. The thickness of the polymer film was 1 μm.

[0702] (Production of optical laminate (7) and elliptically polarizing plate (7))

[0703] The polymer film was subjected to corona treatment once 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 horizontal alignment layer (1) was formed by coating the horizontal alignment layer forming composition (1) on the corona treated surface of the polymer film, and the liquid crystal polarizer forming composition (2) was used instead of the liquid crystal polarizer forming composition (1). The same steps as in Example 1 were followed to produce an optical laminate (7) and an elliptically polarizing plate (7).

[0704] The layer structure of the optical laminate (7) is substrate layer / light absorption anisotropic layer (2) / coating layer (polymer film) / horizontal alignment layer (1) / liquid crystal polarizer (2) / protective layer. The layer structure of the elliptically polarizing plate (9) is substrate layer / light absorption anisotropic layer (2) / coating layer (polymer film) / horizontal alignment layer (1) / liquid crystal polarizer (2) / protective layer / adhesive layer / first liquid crystal phase difference layer (liquid crystal cured film) / adhesive layer / second liquid crystal phase difference layer (liquid crystal cured film) / COP film.

[0705] [Example 8]

[0706] An optical layered body (8) and an elliptically polarizing plate (8) were prepared by the same procedure as in Example 7 except that the composition (2) for forming a horizontal alignment layer was used instead of the composition (1) for forming a horizontal alignment layer.

[0707] [Example 9]

[0708] A light absorption anisotropic layer (2) was formed on the substrate layer (25TAC) by the same procedure as in Example 1 except that the composition described in Table 1 was used as the composition for forming a light absorption anisotropic layer.

[0709] The surface of the light-absorbing anisotropic layer (2) opposite to the substrate layer side was subjected to a corona treatment once 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 hard coating composition was applied to the corona-treated surface of the light-absorbing anisotropic layer (2) using a bar coater, dried at 80°C for 1 minute, and irradiated with ultraviolet rays (under a nitrogen atmosphere, wavelength: 365 nm, cumulative light intensity at a wavelength of 365 nm: 500 mJ / cm 2 ) to form a hard coating layer as a coating layer. The thickness of the hard coating layer is 3 μm.

[0710] (Production of optical laminate (9) and elliptically polarizing plate (9))

[0711] The hard coating layer was subjected to corona treatment once 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 horizontal alignment layer (1) was formed by applying the horizontal alignment layer forming composition (1) on the corona treated surface of the hard coating layer, and the liquid crystal polarizer forming composition (2) was used instead of the liquid crystal polarizer forming composition (1). The same procedures as in Example 1 were followed to produce an optical laminate (9) and an elliptically polarizing plate (9).

[0712] The layer structure of the optical laminate (9) is substrate layer / light absorption anisotropic layer (2) / coating layer (hard coating layer) / horizontal alignment layer (1) / liquid crystal polarizer (2) / protective layer. The layer structure of the elliptically polarizing plate (9) is substrate layer / light absorption anisotropic layer (2) / coating layer (hard coating layer) / horizontal alignment layer (1) / liquid crystal polarizer (2) / protective layer / adhesive layer / first liquid crystal phase difference layer (liquid crystal cured film) / adhesive layer / second liquid crystal phase difference layer (liquid crystal cured film) / COP film.

[0713] [Example 10]

[0714] An optical layered body (10) and an elliptically polarizing plate (10) were prepared by the same procedure as in Example 9 except that the composition (2) for forming a horizontal alignment layer was used instead of the composition (1) for forming a horizontal alignment layer.

[0715] [Example 11]

[0716] A light absorption anisotropic layer (2) was formed on the substrate layer (25TAC) by the same procedure as in Example 1 except that the composition described in Table 1 was used as the composition for forming a light absorption anisotropic layer.

[0717] (Production of optical laminate (11) and elliptically polarizing plate (11))

[0718] The surface of the light-absorbing anisotropic layer (2) opposite to the substrate layer side was subjected to a corona treatment once 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 cationically curable composition was applied to the corona-treated surface of the light-absorbing anisotropic layer (2) using a bar coater, and 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 ) to form a cured film as a coating layer. The thickness of the cured film was 2 μm.

[0719] The cured 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 (1) was formed by coating the corona-treated surface of the cured film with a composition for forming a horizontal alignment layer (1), and an optical laminate (11) and an elliptically polarizing plate (11) were prepared by the same procedure as in Example 1 except that a composition for forming a liquid crystal polarizer (2) was used instead of a composition for forming a liquid crystal polarizer (1).

[0720] The layer structure of the optical laminate (11) is substrate layer / light absorption anisotropic layer (2) / coating layer (cured film) / horizontal alignment layer (1) / liquid crystal polarizer (2) / protective layer. The layer structure of the elliptically polarizing plate (11) is substrate layer / light absorption anisotropic layer (2) / coating layer (cured film) / horizontal alignment layer (1) / liquid crystal polarizer (2) / protective layer / adhesive layer / first liquid crystal phase difference layer (liquid crystal cured film) / adhesive layer / second liquid crystal phase difference layer (liquid crystal cured film) / COP film.

[0721] [Example 12]

[0722] An optical layered body (12) and an elliptically polarizing plate (12) were prepared by the same procedure as in Example 11 except that the composition (2) for forming a horizontal alignment layer was used instead of the composition (1) for forming a horizontal alignment layer.

[0723] [Comparative Example 1]

[0724] (Production of light absorption anisotropic layer (c1) with film substrate)

[0725] A light absorption anisotropic layer (1) was formed on the substrate layer (25TAC) by the same procedure as in Example 1 as a light absorption anisotropic layer (c1) with a film substrate. The layer structure of the light absorption anisotropic layer (c1) with a film substrate was film substrate (substrate layer) / light absorption anisotropic layer (1).

[0726] (Manufacturing of Liquid Crystal Polarizer (c1) with Film Substrate)

[0727] As a film substrate, a triacetyl cellulose (TAC) film ("KC4UY-TAC" manufactured by Konica Minol TA Co., Ltd.) was prepared. On the film substrate, a corona treatment device (AGF-B10, manufactured by Kasuga Electric Co., Ltd.) was used to perform a corona treatment once under the conditions of an output power of 0.3 kW and a treatment speed of 3 m / min. On the corona-treated surface of the film substrate, a horizontal alignment layer (1), a liquid crystal polarizer (1), and a protective layer were formed by the same steps as in Example 1 to obtain a liquid crystal polarizer (c1) with a film substrate. The layer structure of the liquid crystal polarizer (c1) with a film substrate is film substrate / horizontal alignment layer (1) / liquid crystal polarizer (1) / protective layer.

[0728] (Production of Laminated Body (c1))

[0729] Using the adhesive layer prepared above, the light absorption anisotropic layer (1) side of the light absorption anisotropic layer (c1) with a film substrate is laminated to the protective layer side of the liquid crystal polarizer (c1) with a film substrate to obtain a laminate (c1). The layer structure of the laminate (c1) is film substrate / horizontal alignment layer (1) / liquid crystal polarizer (1) / protective layer / adhesive layer / light absorption anisotropic layer (1) / film substrate (substrate layer).

[0730] (Production of elliptically polarizing plate (c1))

[0731] On the film substrate (substrate layer) side of the light absorption anisotropic layer (1) of the laminate (c1), the first liquid crystal phase difference layer and the second liquid crystal phase difference layer are sequentially laminated by the steps described in Example 1 using the adhesive layer prepared above, thereby obtaining an elliptically polarizing plate (c1). The layer structure of the elliptically polarizing plate (c1) is film substrate / horizontal alignment layer (1) / liquid crystal polarizer (1) / protective layer / adhesive layer / light absorption anisotropic layer (1) / film substrate (substrate layer) / adhesive layer / first liquid crystal phase difference layer (liquid crystal cured film) / adhesive layer / second liquid crystal phase difference layer (liquid crystal cured film) / COP film.

[0732] [Calculation of Distance D of Optical Layered Body]

[0733] The distance D from the substrate layer-side surface of the light absorption anisotropic layer to the surface of the liquid crystal polarizer opposite to the horizontal alignment layer side was calculated from the thickness of each layer included in the optical laminate.

[0734] [Measurement of Phase Transition Temperature of Polymerizable Liquid Crystal Compound]

[0735] The phase transition temperature was confirmed by observing the texture of the alignment layer formed on the glass substrate using a polarizing microscope (BX-51, manufactured by Olympus Corporation) while heating the polymerizable liquid crystal compound.

[0736] (Phase Transition Temperature of Polymerizable Liquid Crystal Compound (1))

[0737] The polymerizable liquid crystal compound (1) exhibited a smectic A phase from a crystalline phase at 95°C when the temperature was raised, phase-changed to a nematic phase at 111°C, and phase-changed to an isotropic liquid phase at 113°C. It was confirmed that, when the temperature was lowered, the phase-changed to a nematic phase at 112°C, the phase-changed to a smectic A phase at 110°C, and the phase-changed to a smectic B phase at 94°C.

[0738] (Phase transition temperature of polymerizable liquid crystal compound (2))

[0739] The polymerizable liquid crystal compound (2) exhibited a smectic A phase from a crystalline phase at 81°C when the temperature was raised, phase-changed to a nematic phase at 121°C, and phase-changed to an isotropic liquid phase at 137°C. It was confirmed that, when the temperature was lowered, the phase-changed to a nematic phase at 133°C, the phase-changed to a smectic A phase at 118°C, and the phase-changed to a smectic B phase at 78°C.

[0740] (Phase transition temperature of polymerizable liquid crystal compounds (3) to (5))

[0741] The polymerizable liquid crystal compound (3), the polymerizable liquid crystal compound (4), and the polymerizable liquid crystal compound (5) (Paliocolor LC242, manufactured by BASF) were observed for their texture using a polarizing microscope. As a result, all of them showed only a nematic phase and no clear smectic phase.

[0742] [Measurement of absorbance of light absorption anisotropic layer]

[0743] By the steps described in the examples and comparative examples, a light absorbing anisotropic layer was formed on the substrate layer (25TAC), and the light absorbing anisotropic layer was bonded to a glass of 4 cm×4 cm×0.7 mm thick via the adhesive layer prepared above, and this was used as a measuring sample (1). The measuring sample (1) was set in an ultraviolet visible spectrophotometer ("UV-2450" manufactured by Shimadzu Corporation), and the absorbance was measured to determine Ax and Ax (z=60) at the absorption maximum wavelength within the wavelength range of 380 nm to 780 nm. The absorbance of the substrate layer can be regarded as 0 (zero), so Ax and Ax (z=60) measured for the measuring sample (1) can be said to be the absorbance of the light absorbing anisotropic layer. The results are shown in Tables 1 and 2.

[0744] The x-axis refers to an arbitrary direction in the plane of the light absorption anisotropic layer, the y-axis refers to a direction perpendicular to the x-axis in the film plane, 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° with the y-axis as the rotation axis, and represents the absorbance of linearly polarized light vibrating in the x-axis direction.

[0745] When measuring the absorbance, the sample for measurement (1) is set in a UV-visible spectrophotometer ("UV-2450" manufactured by Shimadzu Corporation), and 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 sample for measurement (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 below, after calibration by the same procedure, the absorbance is measured.

[0746] The satisfaction of the relationship of the above formula (1) in the light absorption anisotropic layer (Az > (Ax + Ay) / 2) is judged by the following procedure.

[0747] In a state where the sample for measurement (1) is rotated by 30° and 60° in a manner including the y-axis, the same linearly polarized light as when measuring Ax is made incident, whereby Ax (z = 30°) and Ax (z = 60°) are measured. Similarly, in a state where the sample for measurement (1) is rotated by 30° and 60° in a manner including the x-axis, the same linearly polarized light as when measuring Ay is made incident, whereby Ay (z = 30°) and Ay (z = 60°) are measured.

[0748] 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°).

[0749] 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 1 and 2.

[0750] [Evaluation of Processability of Optical Laminate]

[0751] When manufacturing the optical laminates (1) to (12) and the laminate (c1), the number of bonding steps for laminating layers using an adhesive layer is counted, and evaluation is carried out according to the following criteria. The results are shown in Tables 1 and 2.

[0752] (Evaluation Criteria)

[0753] A: The number of bonding times is 0 times.

[0754] B: The number of laminations is 1 or more.

[0755] [Evaluation of Orientation of Liquid Crystal Polarizer]

[0756] On the optical laminates (1) to (12) and the laminate (c1), a glass of 4 cm × 4 cm × 0.7 mm thickness was adhered via the adhesive layer prepared above, and used as the measurement sample (2). The measurement sample (2) was arranged on the above-mentioned linear polarizing plate in such a way that the linear polarizing plate arranged on the backlight source and the liquid crystal polarizer in the measurement sample (2) became orthogonal Nicols, and the light absorption anisotropic layer in the measurement sample (2) was located outside the orthogonal Nicols, and the measurement sample (2) was observed. The results of the observation were evaluated according to the following criteria. The results are shown in Tables 1 and 2.

[0757] (Evaluation Criteria)

[0758] A: Black, no light leakage can be felt.

[0759] B: Light leakage is slightly felt.

[0760] C: Light leakage is felt partially or entirely.

[0761] [Evaluation of Adhesion of Optical Laminated Body]

[0762] The protective layer side of the optical laminates (1) to (12) and the film substrate side of the liquid crystal polarizer side of the laminate (c1) were subjected to corona treatment, and a 4 cm × 4 cm glass was bonded via the adhesive layer prepared above. Then, 100 (10 × 10) 2 mm × 2 mm square cross hatches were drawn in a checkerboard pattern from the substrate layer side of the optical laminates (1) to (12) and the film substrate (substrate layer) side of the light absorption anisotropic layer side of the laminate (c1) to penetrate the optical laminates and the laminates, and this was used as a measurement sample (3).

[0763] After affixing an adhesive tape (25 mm in width, manufactured by NICHIBAN) so as to cover the entire 100 cross-cut lines formed in the measurement sample (3), the adhesive tape was peeled off in a direction of 90° relative to the cross-cut surface. The measurement sample (3) after the adhesive tape was peeled off was arranged on a linear polarizing plate arranged on a backlight source, and the number of cross-cut lines remaining on the glass of the measurement sample (3) was counted according to the color tone of the measurement sample (3), and the evaluation was performed according to the following criteria. The results are shown in Tables 1 and 2.

[0764] (Evaluation Criteria)

[0765] A: In 80% or more of the cross-hatch lines, there is no peeling between any layers, and the cross-hatch lines remain.

[0766] B: In 20% or more and less than 80% of the cross-hatch lines, there is no peeling between any layers, and the cross-hatch lines remain.

[0767] C: In less than 20% of the cross-hatching lines, there is no peeling between any layers, and the cross-hatching lines remain.

[0768] [Appearance evaluation of elliptically polarizing plates]

[0769] (Evaluation of initial appearance of elliptically polarizing plate (1))

[0770] The COP film is peeled off from the elliptically polarizing plates (1) to (12) and (c1), and an alkali-free glass with a thickness of 0.7 mm is adhered to the exposed second liquid crystal phase difference layer side via the adhesive layer prepared above as a measurement sample (4). The front glass and polarizing plate are removed from the "Galaxy S5" manufactured by SAMSUNG, and the display device is taken out. The measurement sample (4) is placed on the above-mentioned display device in a manner such that water is interposed between the taken-out display device and the alkali-free glass side of the measurement sample (4). Then, when the power of the display device is turned off (OFF) (when black is displayed), the color tone of the reflection when viewed in a manner where light from a fluorescent lamp is incident from an oblique direction is confirmed, and evaluated according to the evaluation criteria shown below. The results are shown in Tables 1 and 2.

[0771] (Evaluation Criteria)

[0772] A: The hue is barely perceptible.

[0773] B: The tint is slightly felt.

[0774] C: Feel the hue.

[0775] D: The hue is strongly felt.

[0776] (Appearance Evaluation of Elliptically Polarizing Plate after Light Resistance Test (2))

[0777] The display device with the measurement sample (4) mounted thereon was placed in a light resistance tester (SANTEST XLS+, manufactured by ATLAS) with the elliptically polarizing plate side facing upward. 2 The display device after the light resistance test was irradiated with light under the conditions of . For the display device after the light resistance test, the change of the color tone of the reflection in the oblique direction relative to the initial state was confirmed by the steps described in the initial appearance evaluation of the elliptically polarizing plate (1), and the evaluation was performed according to the evaluation criteria shown below. The results are shown in Tables 1 and 2.

[0778] (Evaluation Criteria)

[0779] A: There is almost no noticeable change in color tone.

[0780] B: Feel the change in color tone.

[0781] C: A significant change in color tone is felt.

[0782] [Table 1]

[0783]

[0784] *1: A layer obtained by rubbing a polymer film formed using a resin composition containing a water-soluble polymer.

[0785] [Table 2]

[0786]

Claims

1. An optical laminate, which is an optical laminate obtained by laminating a substrate layer, a light absorption anisotropic layer, a horizontal alignment layer, and a liquid crystal polarizer in this order, 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 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 a plane of the liquid crystal polarizer. The substrate layer is directly connected to the light absorbing anisotropic layer, or there is only a vertical alignment layer between the substrate layer and the light absorbing anisotropic layer. The light absorbing anisotropic layer is directly connected to the horizontal alignment layer, or there is only a coating layer between the light absorbing anisotropic layer and the horizontal alignment layer. The horizontal alignment layer is directly connected to the liquid crystal polarizer. The distance from the surface of the light absorption anisotropic layer on the substrate layer side to the surface of the liquid crystal polarizer on the side opposite to the horizontal alignment layer side is 10 μm or less. 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 absorbances of the absorption maximum wavelength of the light absorption anisotropic layer within the wavelength range of 380 nm to 780 nm, and represent absorbances of linearly polarized light vibrating in the x-axis direction, y-axis direction, and z-axis direction, respectively; Ax(z=60°) is the absorbance at the absorption maximum wavelength, and represents the absorbance of linearly polarized light vibrating in the x-axis direction when the light absorption anisotropic layer is rotated 60° about the y-axis as the rotation axis; in, The x-axis is any direction within the plane of the light absorption anisotropic layer. The y-axis is a direction orthogonal to the x-axis in the plane of the light absorption anisotropic layer, The z-axis is a direction orthogonal to the x-axis and the y-axis.

2. The optical laminate according to claim 1, wherein: A protective layer is further provided on the side of the liquid crystal polarizer opposite to the horizontal alignment layer side.

3. The optical laminate according to claim 2, wherein: The liquid crystal polarizer is directly connected to the protective layer.

4. The optical layered body according to claim 2 or 3, wherein: The protective 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.

5. The optical laminate according to claim 4, wherein: The first liquid crystal retardation 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.

6. The optical layered body according to any one of claims 1 to 3, wherein The substrate layer is a resin film.

7. The optical layered body according to any one of claims 1 to 3, wherein The substrate layer comprises a coating resin layer, The resin constituting the coating resin layer is one or more selected from the group consisting of cellulose ester resins, olefin resins, and (meth)acrylic resins.

8. The optical layered body according to any one of claims 1 to 3, wherein The dichroic pigment contained in the liquid crystal polarizer is an azo pigment.

9. A method for producing an optical laminate, wherein the optical laminate is obtained by laminating a substrate layer, a light absorption anisotropic layer, a horizontal alignment layer, and a liquid crystal polarizer in this order, 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 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 a plane of the liquid crystal polarizer. The method for producing the optical laminate comprises the following steps: A step of forming the light absorption anisotropic layer in direct contact with the substrate layer or in direct contact with a vertical alignment layer formed on a surface of the substrate layer; A process of directly forming the horizontal alignment layer on the light absorption anisotropic layer or forming the horizontal alignment layer via a coating layer; and A step of directly coating a composition for forming the liquid crystal polarizer on the horizontal alignment layer, wherein the composition is a composition for forming a liquid crystal polarizer comprising a polymerizable liquid crystal compound and a dichroic pigment, The process of forming the horizontal alignment layer includes the following steps: [a] a step of directly coating a composition for forming a horizontal alignment layer for forming the horizontal alignment layer on the light absorption anisotropic layer; or [b] a step of directly coating a coating layer-forming composition for forming the coating layer on the light-absorbing anisotropic layer, and a step of directly coating the horizontal alignment layer-forming composition on the coating 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 absorbances of the absorption maximum wavelength of the light absorption anisotropic layer within the wavelength range of 380 nm to 780 nm, and represent absorbances of linearly polarized light vibrating in the x-axis direction, y-axis direction, and z-axis direction, respectively; Ax(z=60°) is the absorbance at the absorption maximum wavelength, and represents the absorbance of linearly polarized light vibrating in the x-axis direction when the light absorption anisotropic layer is rotated 60° about the y-axis as the rotation axis; Wherein, the x-axis is any direction within the plane of the light absorption anisotropic layer, The y-axis is a direction orthogonal to the x-axis in the plane of the light absorption anisotropic layer, The z-axis is a direction orthogonal to the x-axis and the y-axis.

10. The method for producing an optical layered body according to claim 9, wherein: In the optical laminate, a distance from a surface of the light absorption anisotropic layer on the substrate layer side to a surface of the liquid crystal polarizer on the side opposite to the horizontal alignment layer side is 10 μm or less.

11. The method for producing an optical layered body according to claim 9 or 10, wherein: The step of forming the light absorption anisotropic layer includes the step of directly coating a composition for forming a light absorption anisotropic layer containing a polymerizable liquid crystal compound and a dichroic dye on the substrate layer or the vertical alignment layer.

12. The method for producing an optical layered body according to claim 9 or 10, wherein: The optical laminate further comprises a protective layer on the side of the liquid crystal polarizer opposite to the horizontal alignment layer side. The manufacturing method further includes the step of directly coating a protective layer-forming composition for forming the protective layer on a surface of the liquid crystal polarizer on the side opposite to the horizontal alignment layer side.

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