JP2024068090A - Rolled body - Google Patents

Abstract

[Problem] To provide a rolled body capable of reducing the variation in optical properties of sheets cut out from a long laminate. [Solution] A light absorbing anisotropic layer 11 is formed from a composition containing a dichroic dye and a liquid crystal compound, has an absorption axis in a direction perpendicular to the surface of the light absorbing anisotropic layer 11, and satisfies the relationship of the following formula (I): Axmax(z=50°)/Axmin(z=50°)≦1.12(I) [In formula (I), Axmax(z=50°) and Axmin(z=50°) are the absorbance of the light absorbing anisotropic layer 11 at a maximum absorption wavelength in a wavelength range of 380 nm to 780 nm, respectively, and are the maximum and minimum values when the light absorbing anisotropic layer 11 is rotated 50° about the y axis as the rotation axis and the absorbance Ax(z=50°) of linearly polarized light vibrating in the x-axis direction is measured at 10 measurement points set in the light absorbing anisotropic layer 11 included in the laminate 1. [Selected Figure] Figure 1

Description

The present invention relates to a wound body, and further to an organic EL display device and a method for manufacturing the wound body.

In organic EL (electroluminescence) display devices, 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 angle during white display, it is known to use a laminated film having a vertically aligned liquid crystal cured film containing a dichroic dye and a horizontally aligned retardation film (for example, Patent Document 1). The vertically aligned liquid crystal cured film contained in the laminated film is formed by applying a polymerizable liquid crystal composition containing a dichroic dye and a polymerizable liquid crystal compound onto a base layer and polymerizing the polymerizable liquid crystal compound in the applied layer.

JP 2020-76920 A

When manufacturing the above laminated film, a vertically aligned liquid crystal cured film may be continuously formed on a long substrate layer, and then a long laminated film may be obtained through processes such as laminating the film on a long horizontally aligned retardation film, and then the film may be cut to a desired size according to the product size, etc. The inventors have found that, even though a display device uses a sheet of laminated film cut from a single long laminated film, there may be variations in the display characteristics for each display device.

The present invention aims to provide a roll that can reduce the variation in the optical properties of sheets cut from a long laminate.

The present invention provides the following wound body, organic EL display device, and method for manufacturing the wound body.
[1] A rolled body obtained by winding a laminate including a base layer and an optically absorptive anisotropic layer formed on the base layer into a roll,
The optically absorptive anisotropic layer comprises
The liquid crystal display device is formed from a composition containing a dichroic dye and a liquid crystal compound,
having an absorption axis in a direction perpendicular to the surface of the optically absorptive anisotropic layer;
A wound body satisfying the following formula (I):
Ax _max (z = 50°) / Ax _min (z = 50°) ≦ 1.12 (I)
[In formula (I),
Ax _max (z = 50°) and Ax _min (z = 50°) are respectively the absorbance at the maximum absorption wavelength of the optically absorptive anisotropic layer in the wavelength range of 380 nm or more and 780 nm or less, and are the maximum and minimum values when the absorbance Ax (z = 50°) of linearly polarized light vibrating in the x-axis direction when the optically absorptive anisotropic layer is rotated 50° around the y-axis as the rotation axis, is measured at 10 measurement points set on the optically absorptive anisotropic layer contained in the laminate.
Here, the x-axis is an arbitrary direction in the plane of the optically absorptive anisotropic layer,
The y-axis is a direction perpendicular to the x-axis in the plane of the optically absorptive anisotropic layer.
[2] The rolled body according to [1], wherein the optically absorptive anisotropic layer satisfies the relationship of the following formula (II):
Ax _av < 0.050 (II)
[In the formula (II),
Ax _av is the absorbance of the optically absorptive anisotropic layer at the absorption maximum wavelength, and is the average value of the absorbance Ax of linearly polarized light vibrating in the x-axis direction measured at the measurement points.
[3] The rolled body according to [1] or [2], wherein the average thickness of the optically absorptive anisotropic layer measured at the measurement points is 0.7 μm or more and 1.5 μm or less.
[4] The wound body according to any one of [1] to [3], wherein the thickness of the base layer is 30 μm or more and 150 μm or less.
[5] The rolled body according to any one of [1] to [4], wherein the optically absorptive anisotropic layer satisfies the relationship of the following formula (i):
Ax _max (z = 50°) / Ax _min (z = 50°) ≦ 1.08 (i)
[In formula (i), Ax _max (z=50°) and Ax _min (z=50°) are as defined above.]
[6] The rolled body according to any one of [1] to [5], wherein the optically absorptive anisotropic layer satisfies the relationship of the following formula (ii):
Ax _max (z=50°)/Ax _min (z=50°)<1.05 (ii)
[In formula (ii), Ax _max (z = 50°) and Ax _min (z = 50°) are as defined above.]
[7] The roll according to any one of [1] to [6], wherein the laminate further comprises an anti-reflection film.
[8] The roll according to [7], wherein the antireflection film is an elliptically polarizing plate.
[9] [a] A laminate cut out from the roll according to any one of [1] to [6], the laminate comprising the optically absorptive anisotropic layer, an antireflection film, and an image display element; or
[b] An organic EL display device comprising the optically absorptive anisotropic layer and the antireflection film contained in the laminate cut out from the roll according to [7] or [8], and an image display element.
[10] A method for producing the wound body according to any one of [1] to [8],
A step (1) of unwinding and transporting the base material layer from a base material roll around which the base material layer is wound;
A step (2) of forming the optically absorptive anisotropic layer on the base layer to obtain the laminate;
and (3) winding the laminate into a roll.
[11] The step (2) comprises:
A step (2a) of coating a composition containing one or more dichroic dyes on the substrate layer to form a coating layer;
The method for producing a roll according to [10], further comprising the step (2b) of drying the coating layer.

The present invention provides a roll that can reduce the variation in the optical properties of sheets cut from a long laminate.

FIG. 2 is a cross-sectional view showing a schematic diagram of a laminate constituting a wound body according to one embodiment of the present invention. FIG. 11 is a cross-sectional view showing a schematic diagram of a laminate constituting a wound body according to another embodiment of the present invention.

Below, preferred embodiments of the wound body, the organic EL display device, and the method for manufacturing the wound body will be described with reference to the drawings. In each drawing, the same components as those previously described will be assigned the same reference numerals and their description will be omitted.

(Rolled body)
The wound body of this embodiment is a wound body obtained by winding a laminate including a first base material layer (base material layer) and an optically absorbing anisotropic layer formed on the first base material layer into a roll. The roll diameter (diameter) of the wound body can be, for example, 50 mm or more and 1000 mm or less. The laminate wound into a roll to become a wound body is a long laminate (hereinafter, sometimes referred to as a "long laminate"). The long laminate may have a length of, for example, 5 m or more and 10,000 m or less in the length direction, which is the winding direction of the wound body, or 5 m or more and 5,000 m or less, 100 m or more and 5,000 m or less, 500 m or more and 3,000 m or less, or 1,000 m or more and 3,000 m or less. The length in the width direction, which is the winding axis direction of the wound body, may be 300 mm or more and 5000 mm or less, 500 mm or more and 3000 mm or less, 500 mm or more and 2500 mm or less, or 500 mm or more and 2000 mm or less.

The long laminate needs only to include a first base layer and an optically absorbing anisotropic layer, and may include layers other than these. The optically absorbing anisotropic layer included in the long laminate is formed from a composition (hereinafter sometimes referred to as the "first composition") that includes a dichroic dye and a liquid crystal compound, has an absorption axis perpendicular to the surface of the optically absorbing anisotropic layer, and satisfies the relationship of formula (I) described below. The long laminate will be described in detail below.

(Laminate (First Form))
FIG. 1 is a cross-sectional view showing a laminate constituting a roll of an embodiment of the present invention. As shown in FIG. 1, a long laminate 1, which is a laminate constituting a roll, includes a first base layer 12 and a light absorbing anisotropic layer 11. The light absorbing anisotropic layer 11 is formed from a first composition containing a dichroic dye and a liquid crystal compound. The long laminate 1 may have a first alignment layer that regulates the alignment of the liquid crystal compound. The first base layer 12 and the light absorbing anisotropic layer 11 may be in direct contact with each other, or may be laminated with the first alignment layer interposed therebetween. When the long laminate 1 has a first alignment layer, it is preferable that the first alignment layer is in direct contact with the first base layer 12 and the light absorbing anisotropic layer 11.

(Light Absorption Anisotropic Layer)
The optically absorptive anisotropic layer 11 included in the long laminate 1 contains a dichroic dye and has an absorption axis in a direction perpendicular to the surface of the optically absorptive anisotropic layer 11. This allows the optically absorptive anisotropic layer 11 to have the property of easily transmitting light from the front direction and easily absorbing light from oblique directions.

Having an absorption axis perpendicular to the surface of the optically absorptive anisotropic layer 11 means that Ax(z=50°)/Ax is 5 or more. Ax(z=50°) is as described below. Ax is the absorbance of the optically absorptive anisotropic layer 11 at the maximum absorption wavelength in the wavelength range of 380 nm to 780 nm, and represents the absorbance of linearly polarized light vibrating in the x-axis direction.

The optically absorbing anisotropic layer 11 may contain one type of dichroic dye, or may contain two or more types of dichroic dye.

The light absorbing anisotropic layer 11 is preferably a liquid crystal film. In this specification, a liquid crystal film refers to a film obtained from a composition containing a liquid crystal compound. The liquid crystal film may contain a liquid crystal compound, or may contain a polymer of a liquid crystal compound. The polymer of a liquid crystal compound may or may not exhibit liquid crystallinity. The liquid crystal film constituting the light absorbing anisotropic layer 11 contains a dichroic dye.

The liquid crystal compound contained in the first composition is not particularly limited as long as it is a compound having liquid crystallinity, and may be a low molecular weight liquid crystal compound or a high molecular weight liquid crystal compound. The liquid crystal compound may be a polymerizable liquid crystal compound having a polymerizable group. When the liquid crystal film contains a polymer of a liquid crystal compound, the liquid crystal compound is usually a polymerizable liquid crystal compound. The liquid crystal compound is preferably a compound that forms a smectic liquid crystal layer, and the light absorption anisotropic layer 11 preferably contains a liquid crystal compound that forms a smectic liquid crystal phase or a polymer of a liquid crystal compound that forms a smectic liquid crystal phase. The dichroic dye and the liquid crystal compound will be described later.

The optically absorptive anisotropic layer 11 contained in the continuous laminate 1 satisfies the relationship of the following formula (I), preferably satisfies the following formula (i), and more preferably satisfies the following formula (ii).
Ax _max (z = 50°) / Ax _min (z = 50°) ≦ 1.12 (I)
Ax _max (z = 50°) / Ax _min (z = 50°) ≦ 1.08 (i)
Ax _max (z=50°)/Ax _min (z=50°)<1.05 (ii)
[In the formula (I), formula (i), and formula (ii),
Ax _max (z = 50°) and Ax _min (z = 50°) are respectively the absorbance at the maximum absorption wavelength in the wavelength range of 380 nm or more and 780 nm or less of the optically absorptive anisotropic layer 11, and are the maximum and minimum values when the absorbance Ax (z = 50°) of linearly polarized light vibrating in the x-axis direction when the optically absorptive anisotropic layer 11 is rotated 50° around the y-axis as the rotation axis, is measured at 10 measurement points (hereinafter sometimes referred to as "measurement points P ₁₀ ") set on the optically absorptive anisotropic layer 11 contained in the long laminate 1.
Here, the x-axis is an arbitrary direction in the plane of the optically absorptive anisotropic layer 11,
The y-axis is a direction perpendicular to the x-axis in the plane of the optically absorptive anisotropic layer 11.]
The z-axis is a direction perpendicular to the x-axis and y-axis, and is the thickness direction of the optically absorptive anisotropic layer 11 .

In this specification, the measurement points _{P10 at which absorbance Ax (z=50°) is measured to determine Axmax (z=50°) and Axmin (z=50°) are set along the length and width directions of the optically absorbing anisotropic layer 11 of the long laminate 1 unwound from the roll, making up a total of 10 points .} The measurement points _P10 set along the width direction of the optically absorbing anisotropic layer 11 are a total of seven points, including one point at the center position in the width direction of the optically absorbing anisotropic layer 11 and three points set at equal intervals between the center and positions 2.5 cm inward from both ends from the center position toward both ends in the width direction. The measurement points _P10 set along the longitudinal direction of the optically absorbing anisotropic layer 11 are three points set along the length direction (winding direction) of the optically absorbing anisotropic layer 11 at 30 cm intervals from the one point at the center position set along the width direction of the optically absorbing anisotropic layer 11 toward the winding axis side of the roll.

In the above formula (I), Ax _max (z=50°)/Ax _min (z=50°) may be 1.10 or less, 1.08 or less, 1.05 or less, less than 1.05, or 1.04 or less. Ax _max (z=50°)/Ax _min (z=50°) may be 1.00, but is usually 1.01 or more.

It can be said that the closer the value of Ax _max (z=50°)/Ax _min (z=50°) in the above formulas (I) and (i) is to 1, the smaller the variation in the absorbance Ax (z=50°) values at the _ten measurement points P10 in the optically absorptive anisotropic layer 11. Therefore, it can be said that the optically absorptive anisotropic layer 11 that satisfies the relationships of the above formulas (I) and (i) has a uniform in-plane absorbance Ax (z=50°) and the dichroic dye is oriented in the same direction throughout the optically absorptive anisotropic layer 11.

The optically absorbing anisotropic layer 11 contained in the long laminate 1 unwound from the roll is laminated with other layers such as an anti-reflection film, as described below, as necessary, and cut into a sheet of the desired size according to the product size, etc., and applied to a display device, etc. When the optically absorbing anisotropic layer 11 contained in the long laminate 1 satisfies formula (I), it is possible to suppress the occurrence of variation in the optical properties of the sheet. This makes it possible to suppress the occurrence of individual differences in the optical properties of the sheet having the optically absorbing anisotropic layer 11 cut out from the long laminate 1, and therefore suppresses the occurrence of variation in the display properties for each display device when the sheet is applied to a display device.

The absorbance Ax(z=50°) and Ax _max (z=50°)/Ax _min (z=50°) of the optically absorptive anisotropic layer 11 of the long laminate 1 can be adjusted, for example, by the thickness of the optically absorptive anisotropic layer 11, the conditions of the manufacturing process of the optically absorptive anisotropic layer 11 (described later), and the type or content of the dichroic dye and/or liquid crystalline compound contained in the optically absorptive anisotropic layer 11. The absorbance Ax(z=50°) and Ax _max (z=50°)/Ax _min (z=50°) at ten measurement points _P10 of the optically absorptive anisotropic layer 11 can be determined by the method described in the examples described later.

The optically absorptive anisotropic layer 11 included in the continuous laminate 1 preferably satisfies the relationship of the following formula (II).
Ax _av < 0.050 (II)
[In the formula (II),
Ax _av is the absorbance of the optically absorptive anisotropic layer 11 at the maximum absorption wavelength in the wavelength range of 380 nm or more and 780 nm or less, and is the average value when the absorbance Ax of linearly polarized light vibrating in the x-axis direction is measured at the measurement point _P10 .
The x-axis is as described above.]

The measurement point _P10 for determining the absorbance _Axav in the above formula (II) is the same as the measurement point _P10 for determining the absorbances _Axmax (z=50°) and _Axmin (z=50°) in the above formula (I).

It can be said that the smaller the value of absorbance Ax, the more precisely the absorption axis of the dichroic dye is oriented in the vertical direction with respect to the plane of the optically absorptive anisotropic layer 11. Therefore, it can be said that the optically absorptive anisotropic layer 11 in which the absorbance Ax _av satisfies the relationship of the above formula (II) has a small in-plane absorbance Ax overall, and the absorption axis of the dichroic dye is oriented in the vertical direction with high precision overall.

In the above formula (II), the absorbance Ax _av may be 0.045 or less, 0.040 or less, or 0, but is usually 0.001 or more.

The absorbances Ax and _Axav of the optically absorptive anisotropic layer 11 of the long laminate 1 can be adjusted, for example, by the thickness of the optically absorptive anisotropic layer 11, the conditions of the manufacturing process of the optically absorptive anisotropic layer 11 (described later), and the types or contents of the dichroic dye and liquid crystal compound contained in the first composition for obtaining the optically absorptive anisotropic layer 11. The absorbances Ax and _Axav at ten measurement points _P10 of the optically absorptive anisotropic layer 11 can be determined by the method described in the Examples described later.

The average thickness of the optically absorptive anisotropic layer 11 measured at the measurement point P ₁₀ is preferably 0.7 μm or more and 1.5 μm or less, and may be 0.8 μm or more and 1.3 μm or less, or may be 0.9 μm or more and 1.1 μm or less.

The measurement point _P10 for determining the average thickness of the optically absorptive anisotropic layer 11 is the same as the measurement point _P10 for determining the absorbances _Axmax (z=50°) and _Axmin (z=50°) in formula (I). The thickness of the optically absorptive anisotropic layer 11 at the measurement point _P10 can be measured by the method described in the Examples below.

(First Base Layer)
The first substrate layer 12 can support the optically absorptive anisotropic layer 11. The first substrate layer 12 can be a glass substrate or a film substrate, and is preferably a film substrate.

Examples of resins constituting the film substrate include olefin resins such as polyethylene and polypropylene; cyclic olefin resins having a cyclo- or norbornene structure; polyvinyl alcohol; polyethylene terephthalate; poly(meth)acrylic acid esters; cellulose ester resins such as triacetyl cellulose, diacetyl cellulose, and cellulose acetate propionate; polyethylene naphthalate; polycarbonate; polysulfone; polyether sulfone; polyether ketone; polyphenylene sulfide; polyphenylene oxide, etc. Among these, from the viewpoint of transparency when used in optical film applications, a film substrate selected from triacetyl cellulose, cyclic olefin resins, polymethacrylic acid esters, and polyethylene terephthalate is more preferable. (Meth)acrylic means at least one of acrylic and methacrylic. The same applies to the notation (meth)acryloyl, etc.

As the film substrate, a commercially available cellulose ester resin substrate may be used. Examples of such cellulose ester resin substrates include "FUJITAC FILM" (manufactured by Fuji Photo Film Co., Ltd.); "KC8UX2M", "KC8UY" and "KC4UY" (all manufactured by Konica Minolta Opto, Inc.).

Commercially available cyclic olefin resins may be used as the cyclic olefin resin constituting the film substrate. Examples of such cyclic olefin resins include "Topas" (registered trademark) (manufactured by Ticona (Germany)), "Arton" (registered trademark) (manufactured by JSR Corporation), "ZEONOR" (registered trademark), "ZEONEX" (registered trademark) (all manufactured by Zeon Corporation), and "Apel" (registered trademark) (manufactured by Mitsui Chemicals, Inc.). These cyclic olefin resins can be made into film substrates by forming films by known means such as solvent casting and melt extrusion.

Commercially available cyclic olefin resin substrates may be used as the film substrate. Examples of such cyclic olefin resin substrates include "ESCINA" (registered trademark), "SCA40" (registered trademark) (both manufactured by Sekisui Chemical Co., Ltd.), "ZEONOR FILM" (registered trademark) (manufactured by Optes Co., Ltd.), and "ARTON FILM" (registered trademark) (manufactured by JSR Corporation).

As the first substrate layer 12, a film with a surface coating layer in which a surface coating layer is formed on one or both sides of the film substrate, a film with a protective film in which a protective film is laminated on the surface of the film substrate opposite the light absorption anisotropic layer 11 side, or a film in which a surface coating layer is formed on one surface of the film substrate and a protective film is laminated on the other surface may be used.

Examples of the surface coating layer constituting the film with a surface coating layer include a layer formed by applying a hard coating agent, an easy-adhesion composition, or a coupling agent to the surface of the film substrate, and a layer formed by applying a reactive monomer or a reactive polymer to the surface of the film substrate and then graft-polymerizing the reactive monomer or polymer by irradiating the reactive monomer or polymer with active energy rays. As the film with a surface coating layer, for example, a hard coat film having a hard coat layer as the surface coating layer is preferable. When the first substrate layer 12 is a hard coat film, it is preferable that the light absorption anisotropic layer 11 is laminated on the hard coat layer side.

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

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

The content of the polyfunctional (meth)acrylate compound is preferably 50 parts by mass or more and 100 parts by mass or less, more preferably 60 parts by mass or more and 95 parts by mass or less, and even more preferably 70 parts by mass or more and 90 parts by mass or less, 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 excluding the solvent from the curable composition when the curable composition contains a solvent.

The curable composition may contain a polymerization initiator in addition to the curable component. Examples of the polymerization initiator include a photopolymerization initiator and a radical polymerization initiator, and any known polymerization initiator may be used.

The curable composition can be applied to a film substrate and then irradiated with active energy rays to polymerize the curable components, such as the (meth)acrylic compound, and cure the composition.

The hard coat layer preferably exhibits a value of 8B or harder in the pencil hardness test (measured by placing the first substrate layer 12 on a glass plate) specified in JIS K 5600-5-4:1999 "General test methods for paints - Part 5: Mechanical properties of coatings - Section 4: Scratch hardness (pencil method)" and may exhibit a value of 5B or harder.

A release agent or the like may be applied to the surface of the film substrate on which a surface coating layer such as a hard coat layer is formed to perform a release treatment. The first substrate layer 12 may be incorporated together with the optically absorbing anisotropic layer 11 when the optically absorbing anisotropic layer 11 is incorporated into a display device, but it can also be peeled off and removed. By performing a release treatment on the surface of the film substrate as described above, when the optically absorbing anisotropic layer 11 is applied to a display device, the film substrate constituting the first substrate layer 12 can be peeled off and removed, and the surface coating layer and the optically absorbing anisotropic layer 11 can be incorporated.

The protective film constituting the film with protective film is provided releasably on the film substrate constituting the first substrate layer 12. The protective film may have a multilayer structure of a resin film and an adhesive layer, or may be a self-adhesive film made of a single-layer resin film. Examples of resin films used in protective films having a multilayer structure include films made of the resins exemplified as the resins constituting the film substrate. Examples of self-adhesive films include films made of polypropylene-based resins and polyethylene-based resins. The protective film is usually removed after the light-absorbing anisotropic layer 11 is applied to a display device.

The surface of the first substrate layer 12 on which the light absorption anisotropic layer 11 is formed may be subjected to a surface treatment. Examples of the surface treatment method include a method of subjecting the surface of the film substrate to corona treatment or plasma treatment under an atmosphere from vacuum to atmospheric pressure, a method of laser treatment, a method of ozone treatment, a method of flame treatment, a method of saponifying the surface of the first substrate layer 12, and the like.

The thickness of the first substrate layer 12 is preferably thin in terms of the mass being practically manageable, but if it is too thin, the strength decreases and the processability tends to be poor. From this viewpoint, the thickness of the first substrate layer 12 is preferably 30 μm or more and 150 μm or less, and may be 40 μm or more and 150 μm or less, 50 μm or more and 140 μm or less, 60 μm or more and 130 μm or less, or 70 μm or more and 120 μm or less.

As described above, when the optically absorbing anisotropic layer 11 is applied to a display device, the first substrate layer 12 or the film substrate constituting the first substrate layer 12 can be peeled off. In this case, instead of incorporating the optically absorbing anisotropic layer 11 together with the first substrate layer 12 into the display device, the optically absorbing anisotropic layer 11 can be transferred to an adherend, and then the first substrate layer 12 or the film substrate can be peeled off, thereby making it possible to further reduce the thickness of the display device.

(Laminate (Second Form))
Fig. 2 is a cross-sectional view showing a laminate constituting a roll according to another embodiment of the present invention. The long laminate 2 (laminate) shown in Fig. 2 includes the first base layer 12 and the light absorbing anisotropic layer 11 of the long laminate 1 shown in Fig. 1, and further includes an antireflection film 20. In the long laminate 2 shown in Fig. 2, the antireflection film 20 is laminated on the light absorbing anisotropic layer 11 side of the long laminate 1, but the antireflection film 20 may be laminated on the first base layer 12 side of the long laminate 1. The first base layer 12 and the light absorbing anisotropic layer 11 are as described above. The antireflection film 20 is preferably an elliptically polarizing plate.

The anti-reflection film 20 can have a polarizing layer 21 and a first retardation layer 22 having an in-plane phase difference. The first retardation layer 22 may include two or more retardation layers having different in-plane phase differences. In order to achieve a high level of anti-reflection function of the anti-reflection film 20, it is preferable to include a λ/4 retardation layer having a λ/4 plate function (i.e., a π/2 phase difference function) in the entire visible light range. The λ/4 retardation layer is preferably a λ/4 retardation layer with reverse wavelength dispersion. The first retardation layer 22 may be a combination of a retardation layer (λ/2 retardation layer) having a λ/2 plate function with positive wavelength dispersion and a λ/4 retardation layer with positive wavelength dispersion.

The anti-reflection film 20 may further include a second retardation layer 23 (positive C plate) that has anisotropy in the thickness direction in order to compensate for the anti-reflection function in oblique directions.

When the retardation layer constituting the first retardation layer 22 and the second retardation layer 23 are obtained from a composition containing a liquid crystal compound described later, these retardation layers may independently form a tilt alignment state or a cholesteric alignment state.

When the anti-reflection film 20 includes the first retardation layer 22 and the second retardation layer 23, the anti-reflection film 20 in the long laminate 2 may have, from the light absorption anisotropic layer 11 side, the polarizing layer 21, the first retardation layer 22, and the second retardation layer 23 in this order, or may have the polarizing layer 21, the second retardation layer 23, and the first retardation layer 22 in this order. An attachment layer may be present between the layers constituting the anti-reflection film 20. The attachment layer is a pressure-sensitive adhesive layer or an adhesive layer.

The polarizing layer 21 included in the anti-reflection film 20 has light absorption anisotropy. The details of the polarizing layer 21 will be described later, but for example, it is a polarizer in which a dichroic dye, which is a dye having light absorption anisotropy, is uniaxially oriented. Examples of polarizers in which a dichroic dye is uniaxially oriented include a polarizer formed by uniaxially stretching a polymer such as a polyvinyl alcohol resin impregnated with iodine or an organic dichroic dye; and a polarizer made of a polymer of a polymerizable liquid crystal compound containing a dichroic dye, which is formed by orienting a dichroic dye and a polymerizable liquid crystal compound from a composition containing a polymerizable liquid crystal compound and a dichroic dye. Such a polarizer can exhibit a polarizing function by anisotropically absorbing light by the dichroic dye encapsulated in the stretched film or the polymer of the polymerizable liquid crystal compound. The polarizing layer 21 may be incorporated into the long laminate 2 after being made into a polarizing plate with a protective film laminated on one or both sides. Details of the polarizing plate will be described later.

It is preferable that R(λ), which is the in-plane retardation of the first retardation layer 22 included in the antireflection film 20 with respect to light having a wavelength λ [nm], satisfies the optical characteristics shown in the following formula (III), and it is preferable that R(λ) satisfies the optical characteristics shown in the following formulas (III), (IV), and (V).
100 nm < Re (550) < 160 nm (III)
Re(450)/Re(550)≦1.0 (IV)
1.00≦Re(650)/Re(550) (V)
[In the formulas (III) to (V),
Re(550) represents the in-plane retardation value (in-plane retardation) of the retardation layer for light having a wavelength of 550 nm,
Re(450) represents an in-plane retardation value of the retardation layer for light with a wavelength of 450 nm,
Re(650) represents the in-plane retardation value of the retardation layer for light with a wavelength of 650 nm.

When "Re(450)/Re(550)" in the above formula (IV) exceeds 1.0, the light leakage on the short wavelength side in the anti-reflection film 20 (elliptical polarizing plate) having a λ/4 retardation layer increases. "Re(450)/Re(550)" is preferably 0.7 or more and 1.0 or less, more preferably 0.80 or more and 0.95 or less, even more preferably 0.80 or more and 0.92 or less, and particularly preferably 0.82 or more and 0.88 or less. The value of "Re(450)/Re(550)" can be arbitrarily adjusted by adjusting the mixing ratio of the polymerizable liquid crystal compound to adjust the stacking angle and retardation value of the multiple retardation layers constituting the first retardation layer 22, or when a polymerizable liquid crystal compound is used to obtain the retardation layer constituting the first retardation layer 22.

The in-plane retardation value of the first retardation layer 22 and the retardation layer constituting the first retardation layer 22 can be adjusted by the thickness of the first retardation layer 22. Since the in-plane retardation value is determined by the following formula (VI), in order to obtain a desired in-plane retardation value (Re(λ)) at a wavelength λ [nm], Δn(λ) and the film thickness d may be adjusted. The thicknesses of the first retardation layer 22 and the retardation layers constituting the first retardation layer 22 are each independently preferably 0.5 μm to 5 μm, more preferably 1 μm to 3 μm. The thickness can be measured by an interference film thickness meter, a laser microscope, or a stylus film thickness meter. In addition, when a polymerizable liquid crystal compound is used to obtain a retardation layer constituting the first retardation layer 22, Δn(λ) depends on the molecular structure of the polymerizable liquid crystal compound.
Re(λ)=d×Δn(λ) (VI)
[In formula (VI),
Re(λ) represents the in-plane retardation value of the retardation layer at a wavelength λ [nm];
d represents the thickness of the retardation layer,
Δn(λ) represents the birefringence of the retardation layer at a wavelength λ [nm].

The second retardation layer 23 included in the anti-reflection film 20 is preferably a positive C plate. The thickness direction retardation value Rth(550) of the positive C plate at a wavelength of 550 nm is usually in the range of -170 nm or more and -10 nm or less, preferably -150 nm or more and -20 nm or less, and more preferably -100 nm or more and -40 nm or less. If the thickness direction retardation value of the positive C plate is in this range, the anti-reflection properties from oblique directions can be further improved.

When the phase difference layer and the second phase difference layer 23 constituting the first phase difference layer 22 are liquid crystal films, the first phase difference layer 22 and the second phase difference layer 23 may be incorporated into the long laminate 2 in a state where they are laminated with a base layer (a third base layer described later) that supports them. In this case, the phase difference layer constituting the first phase difference layer 22 and the base layer can be in direct contact with each other, and the second phase difference layer 23 and the base layer can be in direct contact with each other.

Below, we will explain the details of each layer that makes up the long laminates 1 and 2, as well as the details of the components contained in those layers.

(Dichroic dye)
The dichroic dye is a dye having different absorbance in the long axis direction of the molecule and absorbance in the short axis direction of the molecule. The dichroic dye preferably has a property of absorbing visible light, and more preferably has a maximum absorption wavelength (λmax) in the wavelength range of 380 to 680 nm.

Examples of such dichroic dyes include acridine dyes, oxazine dyes, cyanine dyes, naphthalene dyes, azo dyes, and anthraquinone dyes, among which azo dyes are preferred. Examples of azo dyes include monoazo dyes, bisazo dyes, trisazo dyes, tetrakisazo dyes, and stilbene azo dyes, among which bisazo dyes and trisazo dyes are preferred. The dichroic dyes may be used alone or in combination of two or more kinds, but it is preferable to use two or more kinds in combination depending on the wavelength range in which light absorption anisotropy is required in the light absorption anisotropic layer.

An example of the azo dye is a compound represented by formula (VII).
T ¹ −A ¹ (−N=N−A ² ) _p −N=N−A ³ −T ² (VII)
[In the formula (VII),
A ¹ , A ² , and A ³ each independently represent a 1,4-phenylene group which may have a substituent, a naphthalene-1,4-diyl group which may have a substituent, a benzoic acid phenyl ester group which may have a substituent, a 4,4′-stilbenylene group which may have a substituent, or a divalent heterocyclic group which may have a substituent;
^T1 and ^T2 each represent an electron withdrawing group or an electron releasing group, and are positioned at substantially 180° to the plane of the azo bond.
p represents an integer of 0 to 4, and when p is 2 or more, each A ² may be the same or different.
The -N=N- bond may be replaced with a -C=C-, -COO-, -NHCO-, or -N=CH- bond as long as absorption in the visible light region is exhibited.]

The content of the dichroic dye in the light-absorbing anisotropic layer is preferably 0.1 parts by mass or more and 30 parts by mass or less, and may be 0.5 parts by mass or more and 20 parts by mass or less, 1 part by mass or more and 10 parts by mass or less, or 1 part by mass or more and 5 parts by mass or less, relative to 100 parts by mass of the light-absorbing anisotropic layer. The content ratio of the dichroic dye in the light-absorbing anisotropic layer can be calculated as the ratio of the dichroic dye to 100 parts by mass of the solid content of the first composition used to form the light-absorbing anisotropic layer. In this specification, the solid content of the first composition means all components of the first composition excluding volatile components such as organic solvents.

The content of the dichroic dye in the first composition (the total amount when multiple types are included) is usually 1 to 60 parts by mass, preferably 1 to 40 parts by mass, and more preferably 1 to 20 parts by mass, per 100 parts by mass of the liquid crystal compound, from the viewpoint of obtaining good light absorption characteristics. If the content of the dichroic dye is less than this range, light absorption will be insufficient and sufficient light absorption anisotropy characteristics will not be obtained, and if the content is more than this range, the alignment of the liquid crystal molecules of the liquid crystal compound may be hindered.

(Liquid crystal compounds and their polymers)
The liquid crystal compound contained in the first composition for forming the light absorption anisotropic layer is used to align the dichroic dye by host-guest interaction. The liquid crystal compound may be a low molecular weight liquid crystal compound or a high molecular weight liquid crystal compound. The liquid crystal compound may be a polymerizable liquid crystal compound. The liquid crystal compound is preferably a compound that forms a smectic liquid crystal layer.

The polymerizable liquid crystal compound is a compound having a polymerizable group and liquid crystallinity. The polymerizable group means a group involved in a polymerization reaction, and is preferably a photopolymerizable group. Here, the photopolymerizable group means a group that can be involved in a polymerization reaction by an active radical or an acid generated from a photopolymerization initiator described later. Examples of the polymerizable group include a vinyl group, a vinyloxy group, a 1-chlorovinyl group, an isopropenyl group, a 4-vinylphenyl group, an acryloyloxy group, a methacryloyloxy group, an oxiranyl group, and an oxetanyl group. Among them, an acryloyloxy group, a methacryloyloxy group, a vinyloxy group, an oxiranyl group, and an oxetanyl group are preferred, and a methacryloyloxy group or an acryloyloxy group is more preferred. The liquid crystallinity may be thermotropic or lyotropic, but when mixed with the above-mentioned dichroic dye, a thermotropic liquid crystal is preferred.

When the polymerizable liquid crystal compound is a thermotropic liquid crystal, it may be a thermotropic liquid crystal compound exhibiting a nematic liquid crystal phase, or a thermotropic liquid crystal compound exhibiting a smectic liquid crystal phase. When the light absorption anisotropy characteristic is expressed as a liquid crystal cured film (liquid crystal film) by a polymerization reaction, the liquid crystal state exhibited by the polymerizable liquid crystal compound is preferably a smectic phase, and a high-order smectic phase is more preferable from the viewpoint of high performance. Among them, a high-order smectic 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 preferable, and a high-order smectic liquid crystal compound that forms a smectic B phase, a smectic F phase, or a smectic I phase is even more preferable. When the liquid crystal phase formed by the polymerizable liquid crystal compound is a high-order smectic phase, a light-absorption anisotropic layer with higher light-absorption anisotropic properties can be manufactured. Such a light-absorption anisotropic layer with high light-absorption anisotropic properties is one in which a Bragg peak derived from a high-order structure such as a hexatic phase or a crystalline phase is obtained in X-ray diffraction measurement. The Bragg peak is a peak derived from the periodic structure of molecular orientation, and the light-absorption anisotropic layer can have a periodic interval of 3 to 6 Å. It is preferable that the light-absorption anisotropic layer contains a polymer of a polymerizable liquid crystal compound oriented in a smectic phase state, from the viewpoint of obtaining higher light-absorption anisotropic properties.

The polymerizable liquid crystal compound may be a monomer, an oligomer in which a polymerizable group is polymerized, or a polymer. Such polymerizable liquid crystal compounds may be known, and examples of such compounds include those described in JP-A-2020-76920 and JP-A-6728581.

When the liquid crystal compound is a polymeric liquid crystal compound as described above, the liquid crystal polymer may be any known liquid crystal polymer, such as those described in JP 2011-237513 A.

The liquid crystal compound may be used alone or in combination of two or more. The content of the liquid crystal compound in the light absorption anisotropic layer is preferably 40 parts by weight or more and 99.9 parts by weight or less, and may be 60 parts by weight or more and 99 parts by weight or less, or may be 70 parts by weight or more and 99 parts by weight or less, relative to 100 parts by weight of the light absorption anisotropic layer. When the content of the liquid crystal compound is within the above range, the orientation of the liquid crystal compound when forming the light absorption anisotropic layer tends to be high. The content ratio of the liquid crystal compound or its polymer in the light absorption anisotropic layer can be calculated as the ratio of the liquid crystal compound to 100 parts by weight of the solid content of the first composition used to form the light absorption anisotropic layer.

(Method of forming optically absorptive anisotropic layer)
The light-absorbing anisotropic layer can be formed, for example, by applying a first composition containing a dichroic dye and a liquid crystal compound onto a first substrate layer. The coating layer formed by applying the first composition can be subjected to a drying treatment or the like to remove the solvent or the like to form a light-absorbing anisotropic layer. When the first composition contains a polymerizable liquid crystal compound, the coating layer after the drying treatment can be irradiated with active energy rays or the like to polymerize the polymerizable liquid crystal compound, thereby forming a light-absorbing anisotropic layer as a cured layer of the polymerizable liquid crystal compound. The first composition may be applied to the surface of the first substrate layer, or may be applied to the surface of the first alignment layer formed on the surface of the first substrate layer.

The content of the dichroic dye in the first composition (the total amount when multiple types are included) can be appropriately determined depending on the type of dichroic dye, etc., but from the viewpoint of obtaining good light absorption characteristics, it may be, for example, 1 part by mass to 60 parts by mass, 1 part by mass to 40 parts by mass, or 1 part by mass to 20 parts by mass, relative to 100 parts by mass of the liquid crystal compound. If the content of the dichroic dye is less than the above range, the light absorption ability of the light absorption anisotropic layer may be insufficient, and sufficient light absorption anisotropy may not be obtained. If the content of the dichroic dye is more than the above range, the alignment of the liquid crystal compound may be hindered.

The first composition may contain a solvent in addition to the dichroic dye and liquid crystal compound. Since liquid crystal compounds generally have high viscosity, dissolving them in a solvent to form a first composition containing the solvent often makes it easier to apply to the first base layer, and as a result, it is often easier to form a light absorption anisotropic layer. As the solvent, one that can completely dissolve the liquid crystal compound is preferable, and it is also preferable that the solvent is inactive in the polymerization reaction of the liquid crystal compound. Examples of the solvent include alcohol solvents such as methanol, ethanol, ethylene glycol, isopropyl alcohol, propylene glycol, ethylene glycol methyl ether, ethylene glycol butyl ether, and propylene glycol monomethyl ether; ester solvents such as ethyl acetate, butyl acetate, ethylene glycol methyl ether acetate, γ-butyrolactone, propylene glycol methyl ether acetate, and ethyl lactate; ketone solvents such as acetone, methyl ethyl ketone, cyclopentanone, cyclohexanone, 2-heptanone, and methyl isobutyl ketone; aliphatic hydrocarbon solvents such as pentane, hexane, and heptane; aromatic hydrocarbon solvents such as toluene and xylene; nitrile solvents such as acetonitrile; ether solvents such as tetrahydrofuran and dimethoxyethane; chlorine-containing solvents such as chloroform and chlorobenzene; and amide solvents such as dimethylacetamide, dimethylformamide, N-methyl-2-pyrrolidone, and 1,3-dimethyl-2-imidazolidinone. These solvents may be used alone or in combination of two or more.

The content of the solvent in the first composition is preferably 50 to 98% by mass relative to the total amount of the first composition. In other words, the content of the solids in the first composition is preferably 2 to 50% by mass, more preferably 5 to 30% by mass. If the content of the solids is 50% by mass or less, the viscosity of the first composition is low, making it easier to form the optically absorptive anisotropic layer with a substantially uniform thickness, and the optically absorptive anisotropic layer tends to be less prone to unevenness. The content of the solids can be determined taking into consideration the thickness of the optically absorptive anisotropic layer to be manufactured.

The first composition may further contain additives such as a polymerization initiator, such as a photopolymerization initiator or a thermal polymerization initiator, a leveling agent, an antioxidant, a photosensitizer, etc. When the first composition is applied directly to the surface of the first substrate layer (when the first alignment layer is not used), it is preferable that the first composition further contains an alignment promoter.

The polymerization initiator is used when the first composition contains a compound involved in the polymerization reaction, such as a polymerizable liquid crystal compound, and is a compound capable of initiating the polymerization reaction of the compound. As a polymerization initiator that initiates the polymerization reaction of the polymerizable liquid crystal compound, a photopolymerization initiator that generates active radicals by the action of light is preferable, from the viewpoint of not being dependent on the phase state of the thermotropic liquid crystal.

The photopolymerization initiator may be any known photopolymerization initiator, so long as it is a compound capable of initiating a polymerization reaction of a polymerizable liquid crystal compound or the like. Specific examples include photopolymerization initiators capable of generating active radicals or acids under the action of light, and among these, photopolymerization initiators that generate radicals under the action of light are preferred. Photopolymerization initiators may be used alone or in combination of two or more types.

As the photopolymerization initiator, a known photopolymerization initiator can be used. For example, the photopolymerization initiator that generates active radicals is
Self-cleavage type benzoin compounds, acetophenone compounds, hydroxyacetophenone compounds, α-aminoacetophenone compounds, oxime ester compounds, acylphosphine oxide compounds, azo compounds, and the like;
Hydrogen abstraction type benzophenone compounds, alkylphenone compounds, benzoin ether compounds, benzil ketal compounds, dibenzosuberone compounds, anthraquinone compounds, xanthone compounds, thioxanthone compounds, halogenoacetophenone compounds, dialkoxyacetophenone compounds, halogenobisimidazole compounds, halogenotriazine compounds, triazine compounds, etc. can be used.

Iodonium salts and sulfonium salts can be used as photopolymerization initiators that generate acid.

From the viewpoint of excellent reaction efficiency at low temperatures, the photopolymerization initiator is preferably a self-cleaving type photopolymerization initiator, and in particular, acetophenone-based compounds, hydroxyacetophenone-based compounds, α-aminoacetophenone-based compounds, and oxime ester-based compounds are preferred.

The content of the polymerization initiator in the first composition can be adjusted as appropriate depending on the type and amount of the polymerizable liquid crystal compound, but is usually 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, per 100 parts by mass of the polymerizable liquid crystal compound. When the content of the polymerization initiator is within the above range, polymerization can be carried out without disturbing the orientation of the polymerizable liquid crystal compound.

A leveling agent is an additive that adjusts the fluidity of the composition and makes the film obtained by applying the composition flatter. Examples of leveling agents include organic modified silicone oil-based, polyacrylate-based, and perfluoroalkyl-based leveling agents. Among these, polyacrylate-based and perfluoroalkyl-based leveling agents are preferred.

When the first composition contains a leveling agent, the amount is preferably 0.01 to 5 parts by mass, more preferably 0.05 to 3 parts by mass, relative to 100 parts by mass of the liquid crystal compound. When the amount of the leveling agent is within the above range, the liquid crystal compound is easily aligned, and the resulting light absorption anisotropic layer tends to be smoother. When the amount of the leveling agent relative to the liquid crystal compound exceeds the above range, the resulting light absorption anisotropic layer tends to be uneven. The first composition may contain two or more types of leveling agents.

The first composition can be obtained by stirring the dichroic dye and liquid crystal compound, and, if necessary, additives such as a solvent, an alignment promoter, a polymerization initiator, and a leveling agent.

Prior to applying the first composition to the surface of the first substrate layer or the surface of the first alignment layer formed on the surface of the first substrate layer, it is preferable to perform a static elimination treatment on the first substrate layer or the first substrate layer on which the first alignment layer is formed. The static elimination treatment can be performed using a known static elimination device such as a static elimination cord, a static elimination brush, or an ionizer (static elimination bar). If the first substrate layer (including the case where the first alignment layer is formed) on which the first composition is applied is charged, coating unevenness is likely to occur when the first composition is applied. By performing a static elimination treatment, it becomes easier to form a light absorption anisotropic layer that satisfies the relationship of the above formula (I).

Methods for applying the first composition include known methods such as application methods such as spin coating, extrusion, gravure coating, die coating, bar coating, and applicator methods, and printing methods such as flexography.

It is preferable to perform a drying process on the coating layer of the first composition formed on the first substrate layer. When the first composition contains a solvent, the solvent in the coating layer can be removed by drying the coating layer. Examples of the drying method include known methods, such as one or more of natural drying, heat drying, ventilation drying, and reduced pressure drying. The drying process of the coating layer may be performed in one stage, two or more stages, for example, three stages. When the heat drying is performed in two or more stages, the temperature may be the same in each stage, but it is preferable to perform the drying process so that the drying temperature in the previous stage is relatively low and the drying temperature in the subsequent stage is relatively high. When the ventilation drying is performed in two or more stages, the air volume in the previous stage may be relatively small and the air volume in the subsequent stage may be relatively large. When the reduced pressure drying is performed in two or more stages, the reduced pressure conditions in the previous stage may be relatively small and the reduced pressure conditions in the subsequent stage may be relatively large. By increasing the drying temperature, air volume, and reduced pressure conditions in the latter drying process compared to the former drying process, it is possible to suppress unevenness that occurs in the coating layer during the drying process, and it becomes easier to form an optically absorbing anisotropic layer that satisfies the relationship of formula (I) above.

The drying conditions in the drying process can be appropriately determined depending on the components contained in the first composition. For example, the drying temperature in the drying process is 50° C. or more and 150° C. or less, and may be 60° C. or more and 120° C. or less. From the viewpoint of reducing the value of Ax _max (z=50°)/Ax _min (z=50°), it is preferable to set the drying temperature in a temperature range where the polymerizable liquid crystal compound exhibits a smectic phase. More preferably, the maximum drying temperature is set to a temperature 5° C. or more lower than the phase transition temperature between the smectic phase and the nematic phase of the polymerizable liquid crystal compound. The drying time in the drying process is 15 seconds or more and 10 minutes or less, and may be 0.5 minutes or more and 5 minutes or less.

When a heat treatment is performed in the drying process, the liquid crystal compound contained in the first composition is heated to a temperature equal to or higher than the liquid crystal phase transition temperature at which the liquid crystal compound undergoes a phase transition, thereby removing the solvent in the coating layer and orienting the liquid crystal compound. This allows the liquid crystal compound to be oriented in a direction perpendicular to the surface of the light absorption anisotropic layer, and the dichroic dye can also be oriented in conjunction with the orientation of the liquid crystal compound.

Alternatively, when a first alignment layer is provided on the surface of the first substrate layer, the liquid crystal compound and dichroic dye in the coating layer may be aligned by the alignment control force of the first alignment layer.

When the first composition does not contain a polymerizable liquid crystal compound, the liquid crystal compound and the dichroic dye may be aligned as described above, and then the solvent may be removed to obtain a light absorbing anisotropic layer.

When the first composition contains a polymerizable liquid crystal compound, the coating layer formed on the first substrate layer is dried, and the polymerizable liquid crystal compound and the dichroic dye are oriented, and then the polymerizable liquid crystal compound is polymerized and cured by irradiating the layer with active energy rays, thereby forming a light absorbing anisotropic layer in which the liquid crystal compound and the dichroic dye are oriented.

Photopolymerization is preferred as a method for polymerizing the polymerizable liquid crystal compound. Photopolymerization is performed by irradiating an active energy ray to a laminate structure including a coating layer in which a first composition containing a polymerizable liquid crystal compound is applied on a first substrate layer or a first alignment layer. The active energy ray to be irradiated is appropriately selected according to the type of polymerizable liquid crystal compound contained in the coating layer (particularly, the type of photopolymerizable functional group possessed by the polymerizable liquid crystal compound), the type of photopolymerization initiator if a photopolymerization initiator is included, and the amount thereof. Specifically, one or more types of light selected from the group consisting of visible light, ultraviolet light, infrared light, X-rays, α rays, β rays, and γ rays can be mentioned. Among them, ultraviolet light is preferred because it is easy to control the progress of the polymerization reaction and photopolymerization devices widely used in this field can be used, and it is preferable to select the type of polymerizable liquid crystal compound so that it can be photopolymerized by ultraviolet light.

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

The ultraviolet irradiation intensity is usually 10 mW/cm ² to 3,000 mW/cm ^2. The ultraviolet irradiation intensity is preferably an intensity in a wavelength region effective for activating a cationic polymerization initiator or a radical polymerization initiator. The time for irradiating light is usually 0.1 seconds to 10 minutes, preferably 1 second to 5 minutes, more preferably 5 seconds to 3 minutes, and even more preferably 10 seconds to 1 minute. When irradiating once or a plurality of times with such ultraviolet irradiation intensity, the accumulated light amount is 10 mJ/cm ² to 3,000 mJ/cm ² , preferably 50 mJ/cm ² to 2,000 mJ/cm ² , and more preferably 100 mJ/cm ² to 1,000 mJ/cm ^2. When the accumulated light amount is below this range, the polymerizable liquid crystal compound is insufficiently cured, and good transferability may not be obtained when transferring the light absorption anisotropic layer to an adherend. On the other hand, if the integrated light amount is greater than this range, the light absorption anisotropic layer may become colored.

The polymerization and curing of the polymerizable liquid crystal compound is preferably carried out while cooling the first substrate layer on which the coating layer is formed. The cooling method is not particularly limited, but for example, the roll (backup roll) supporting the first substrate layer on which the coating layer is formed may be cooled when irradiating with active energy rays. The temperature of the roll may be, for example, 5°C or higher and 30°C or lower, or may be 10°C or higher and 25°C or lower.

The first alignment layer facilitates the alignment of the liquid crystals of the liquid crystal compound. The state of liquid crystal alignment varies depending on the properties of the first alignment layer and the liquid crystal compound, and the combination can be selected arbitrarily.

When the first alignment layer is made of an alignment polymer, the alignment control force can be adjusted as desired by changing the surface condition and rubbing conditions. When the first alignment layer is made of a photoalignment polymer, the alignment control force can be adjusted as desired by changing the polarized light irradiation conditions, etc. In addition, the liquid crystal alignment can be controlled by selecting the physical properties of the liquid crystal compound, such as the surface tension and liquid crystallinity.

The first alignment layer formed between the first substrate layer and the optically absorptive anisotropic layer is preferably insoluble in the solvent used to form the optically absorptive anisotropic layer on the first alignment layer, and is heat resistant to the heat treatment for removing the solvent and for orienting the liquid crystal. Examples of the first alignment layer include a polymer alignment layer made of an orientable polymer, a photoalignment layer, a groove alignment layer, and a stretched film stretched in the alignment direction. When applied to a long rolled film, a photoalignment layer is preferred because the alignment direction can be easily controlled.

The thickness of the first alignment layer 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 to 300 nm.

Examples of the alignment polymers used in the rubbing alignment layer include polyamides and gelatins having amide bonds in the molecule, polyimides having imide bonds in the molecule, and their hydrolyzates such as polyamic acid, polyvinyl alcohol, alkyl-modified polyvinyl alcohol, polyacrylamide, polyoxazole, polyethyleneimine, polystyrene, polyvinylpyrrolidone, polyacrylic acid, and polyacrylic acid esters. Among these, polyvinyl alcohol is preferred. These alignment polymers may be used alone or in combination of two or more.

One method of rubbing is to apply an oriented polymer composition to a first substrate layer, anneal the layer, and then bring the layer into contact with a rotating rubbing roll wrapped with a rubbing cloth.

The photo-alignment layer is made of a polymer, oligomer, or monomer having a photoreactive group. The photo-alignment layer is formed by applying polarized light to a coating layer formed by applying a composition for forming the photo-alignment layer to a first substrate layer. The photo-alignment layer is more preferable in that the direction of the alignment force can be freely controlled by selecting the polarization direction of the polarized light to be applied.

The photoreactive group is a group that generates liquid crystal alignment ability by irradiation with light. Specifically, it is a group that generates a photoreaction that is the origin of liquid crystal alignment ability, such as molecular alignment induction caused by irradiation with light, or an isomerization reaction, a dimerization reaction, a photocrosslinking reaction, or a photodecomposition reaction. Among the photoreactive groups, those that cause a dimerization reaction or a photocrosslinking reaction are preferred in terms of excellent alignment ability. As photoreactive groups that can generate the above-mentioned reactions, those having an unsaturated bond, especially a double bond, are preferred, and groups 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) are more preferred.

Examples of photoreactive groups having a C=C bond include vinyl groups, polyene groups, stilbene groups, stilbazolyl groups, stilbazolium groups, chalcone groups, and cinnamoyl groups. From the viewpoint of easy control of reactivity and the expression of alignment control force during photoalignment, chalcone groups and cinnamoyl groups are preferred. Examples of photoreactive groups having a C=N bond include groups having structures such as aromatic Schiff bases and aromatic hydrazones. Examples of photoreactive groups having an N=N bond include azobenzene groups, azonaphthalene groups, aromatic heterocyclic azo groups, bisazo groups, and formazan groups, as well as groups having an azoxybenzene basic structure. Examples of photoreactive groups having a C=O bond include benzophenone groups, coumarin groups, anthraquinone groups, and maleimide groups. These groups may have substituents such as alkyl groups, alkoxy groups, aryl groups, allyloxy groups, cyano groups, alkoxycarbonyl groups, hydroxyl groups, sulfonic acid groups, and halogenated alkyl groups.

The polarized light may be irradiated directly from the film surface of the coating layer of the composition for forming the photo-alignment layer, or may be irradiated from the first base layer side and then transmitted through the film. It is particularly preferable that the polarized light is substantially parallel light. The wavelength of the polarized light to be irradiated is preferably in a wavelength range in which the photoreactive group of the polymer or monomer having a photoreactive group can absorb light energy. Specifically, UV (ultraviolet light) in the wavelength range of 250 to 400 nm is particularly preferable. Examples of light sources used for the polarized light irradiation include xenon lamps, high-pressure mercury lamps, ultra-high-pressure mercury lamps, metal halide lamps, and ultraviolet lasers such as KrF and ArF, and high-pressure mercury lamps, ultra-high-pressure mercury lamps, and metal halide lamps are more preferable. These lamps are preferable because they have a high emission intensity of ultraviolet light with a wavelength of 313 nm. Polarized light can be irradiated by passing the light from the above-mentioned light source through an appropriate polarizer. As such a polarizer, a polarizing filter, a polarizing prism such as Glan-Thompson or Glan-Taylor, or a wire grid type polarizer can be used.

(Polarizing Layer)
The polarizing layer has a property of transmitting linearly polarized light having a vibration plane perpendicular to the absorption axis when non-polarized light is incident. The polarizing layer may be a stretched polarizing film in which a dye having absorption anisotropy is adsorbed on a polymer such as a polyvinyl alcohol-based resin (hereinafter, a stretched polarizing film using a polyvinyl alcohol-based resin as the polymer may be referred to as a "PVA polarizing film"); or a liquid crystal polarizing film including a polarizing layer of a liquid crystal film formed by applying a second composition containing a dye having absorption anisotropy and a compound having liquid crystallinity to a substrate film. An example of the dye having absorption anisotropy is a dichroic dye. The dichroic dye contained in the PVA polarizing film is preferably iodine.

The PVA polarizing film can be obtained through a process of uniaxially stretching a polyvinyl alcohol resin film (hereinafter sometimes referred to as "PVA film"), a process of dyeing the PVA film with a dichroic dye to adsorb the dichroic dye, a process of treating the PVA film with the adsorbed dichroic dye with an aqueous boric acid solution, and, if necessary, a process of washing with water after the treatment with the aqueous boric acid solution.

The thickness of the polarizing layer, which is a PVA polarizing film, is usually 30 μm or less, preferably 18 μm or less, more preferably 15 μm or less, and even more preferably 10 μm or less. The thickness is usually 1 μm or more, for example, 5 μm or more.

The uniaxial stretching of the PVA-based film can be performed before, simultaneously with, or after dyeing with a dichroic dye. When the uniaxial stretching is performed after dyeing, the uniaxial stretching may be performed before or during the boric acid treatment. Of course, the uniaxial stretching can be performed in the multiple stages shown here. For the uniaxial stretching, a method of uniaxially stretching in the film transport direction between rolls with different peripheral speeds, a method of uniaxially stretching in the film transport direction using a heated roll, or a method of stretching in the width direction using a tenter can be used. The uniaxial stretching may be performed by dry stretching in the air, or by wet stretching in a swollen state of the PVA-based film using a solvent such as water. The stretching ratio is usually about 3 to 8 times. In addition, an aqueous solution containing polyvinyl alcohol may be applied to the thermoplastic resin film, followed by drying, and then stretched together with the thermoplastic resin film by the above method.

Dyeing of a PVA-based film with a dichroic dye can be carried out, for example, by immersing the PVA-based film in an aqueous solution containing the dichroic dye. Specific examples of the dichroic dye that can be used include iodine and dichroic organic dyes.

A liquid crystal polarizing film formed from a second composition containing a dye having absorption anisotropy and a compound having liquid crystal properties can be suitably used for flexible display applications, for example, because the hue can be freely controlled, the film can be significantly thinned, and the film is non-shrinkable because it is not stretched or relaxed by heat.

The liquid crystal polarizing film can be obtained, for example, by applying the second composition onto the second substrate layer and orienting the dichroic dye contained in the second composition to form a polarizing layer. In the polarizing layer contained in the liquid crystal polarizing film, the dichroic dye and the compound or its polymer having liquid crystal properties are oriented horizontally relative to the surface of the second substrate layer.

The thickness of the polarizing layer contained in the liquid crystal polarizing film is a film of 0.1 μm to 5 μm, more preferably 0.3 μm to 4 μm, and even more preferably 0.5 μm to 3 μm. If the thickness is smaller than this range, the necessary light absorption may not be obtained, and if the thickness is larger than this range, the alignment control force by the second alignment layer (described later) decreases, and alignment defects tend to occur easily.

The polarizing layer (liquid crystal film) contained in the liquid crystal polarizing film preferably has a ratio (dichroic ratio; A1/A2) of absorbance A1 (λ) in the orientation direction for light of wavelength λ [nm] to absorbance A2 (λ) in the direction perpendicular to the in-plane of the orientation direction of the light (dichroic ratio) of 7 or more, more preferably 20 or more, and even more preferably 40 or more. The higher the dichroic ratio, the more excellent the absorption selectivity of the polarizing layer. Depending on the type of dichroic dye, when the liquid crystal film (liquid crystal cured film) contained in the liquid crystal polarizing film is cured in a nematic liquid crystal phase state, the dichroic ratio is about 5 to 10.

By mixing two or more dichroic dyes with different absorption wavelengths, it is possible to create polarizing layers of various hues, and to create polarizing layers that absorb the entire visible light range. By creating a polarizing layer with such absorption characteristics, it can be used in a variety of applications.

The second substrate layer may be one described for the first substrate layer. The second substrate layer may be peeled off when forming an anti-reflection film, but may not be peeled off and may be used as a protective film for the polarizing layer. The dichroic dye used in the liquid crystal polarizing film may be the dichroic dye used in the light absorption anisotropic layer. The compound having liquid crystal properties may be a rod-shaped liquid crystal compound, a discotic liquid crystal compound, or a mixture thereof. The compound having liquid crystal properties is preferably a polymerizable liquid crystal compound. The compound having liquid crystal properties and the polymerizable liquid crystal compound may be the liquid crystal compound used in the light absorption anisotropic layer.

The liquid crystal polarizing film may include a second alignment layer. The second alignment layer is preferably a horizontal alignment layer that can align a compound having liquid crystallinity in a horizontal direction relative to the surface of the liquid crystal polarizing film. Examples of the second alignment layer include a polymer alignment layer formed of an alignment polymer, a photoalignment layer formed of a photoalignment polymer, and a groove alignment layer having a concave-convex pattern or multiple grooves on the layer surface. From the viewpoint of the precision and quality of the alignment angle, the second alignment layer is preferably a photoalignment layer. Examples of the above-mentioned alignment layers that constitute the second alignment layer include those described for the first alignment layer.

(Polarizer)
The polarizing plate is a linear polarizing plate having a protective film on one or both sides of the polarizing layer. A thermoplastic resin film can be used as the protective film. The thermoplastic resin film may be subjected to a surface treatment (e.g., corona treatment, etc.) in order to improve adhesion with the polarizing layer, and a thin layer such as a primer layer (also called an undercoat layer) may be formed on the thermoplastic resin film. The polarizing layer and the protective film may be in direct contact with each other, or may be laminated via an attachment layer (adhesive layer or adhesive layer).

The thermoplastic resin constituting the thermoplastic resin film is preferably a transparent film, and examples thereof include cellulose resins such as triacetyl cellulose; 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 cyclo- and norbornene structures (also called norbornene-based resins); (meth)acrylic resins; polyarylate resins; polystyrene resins; polyvinyl alcohol resins, and the like. Among these, the thermoplastic resin film is preferably a cyclic polyolefin-based resin film, a cellulose ester-based resin film, a polyester-based resin film, or a (meth)acrylic-based resin film.

The protective film may be a thermoplastic resin film having a hard coat layer formed thereon. The hard coat layer may be formed on one side of the thermoplastic resin film, or on both sides. By providing the hard coat layer, the thermoplastic resin film can be improved in hardness and scratch resistance. The hard coat layer is, for example, a cured layer of an active energy ray curable resin, preferably an ultraviolet ray curable resin. Examples of ultraviolet ray curable resins include (meth)acrylic resins, silicone resins, polyester resins, urethane resins, amide resins, and epoxy resins. The hard coat layer may contain additives to improve strength. The additives are not particularly limited, and examples include inorganic fine particles, organic fine particles, and mixtures thereof.

The thickness of the protective film is preferably 5 μm or more and 150 μm or less, and may be 10 μm or more and 100 μm or less, or may be 10 μm or more and 80 μm or less.

(First Retardation Layer, Second Retardation Layer)
The first retardation layer and the second retardation layer (hereinafter, these may be collectively referred to as "retardation layers") may be a stretched film or a liquid crystal film including a liquid crystal film, but are preferably liquid crystal films.

When the retardation layer is a stretched film, the stretched film may be a conventionally known film, and may be a resin film that has been uniaxially or biaxially stretched to impart retardation. Examples of resin films that may be used include, but are not limited to, cellulose films such as triacetyl cellulose and diacetyl cellulose, polyester films such as polyethylene terephthalate, polyethylene isophthalate, and polybutylene terephthalate, acrylic resin films such as polymethyl (meth)acrylate and polyethyl (meth)acrylate, polycarbonate films, polyethersulfone films, polysulfone films, polyimide films, polyolefin films, and polynorbornene films.

When the retardation layer is a stretched film, 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.

When the retardation layer is a liquid crystal film, the liquid crystal film can be formed by applying a third composition containing a compound having liquid crystallinity to a third substrate layer to form a liquid crystal film.

The third substrate layer may be one described in the first substrate layer. The third substrate layer may be peeled off when forming an anti-reflection film, but may be used as a protective film for the retardation layer without peeling off. As the liquid crystal compound, a polymerizable liquid crystal compound that is a liquid crystal compound having a polymerizable group, particularly a photopolymerizable group, may be used. As the polymerizable liquid crystal compound, for example, a polymerizable liquid crystal compound conventionally known in the field of retardation films may be used. The photopolymerizable group refers to a group that can participate in a polymerization reaction by a reactive species generated from a photopolymerization initiator, such as an active radical or an acid. As the photopolymerizable group, a vinyl group, a vinyloxy group, a 1-chlorovinyl group, an isopropenyl group, a 4-vinylphenyl group, an acryloyloxy group, a methacryloyloxy group, an oxiranyl group, an oxetanyl group, etc. may be mentioned. Among them, an acryloyloxy group, a methacryloyloxy group, a vinyloxy group, an oxiranyl group, and an oxetanyl group are preferable, and an acryloyloxy group is more preferable. The liquid crystal may be either thermotropic or lyotropic, but thermotropic liquid crystal is preferred because it allows precise control of the film thickness. The phase order structure in the thermotropic liquid crystal may be either nematic or smectic. It may also be rod-shaped or discotic. The polymerizable liquid crystal compounds may be used alone or in combination.

［式（ＶＩＩＩ）中、
Ａｒは置換基を有していてもよい二価の芳香族基を表す。該二価の芳香族基中には窒素原子、酸素原子、硫黄原子のうち少なくとも１つ以上が含まれることが好ましい。二価の基Ａｒに含まれる芳香族基が２つ以上である場合、２つ以上の芳香族基は互いに単結合、－ＣＯ－Ｏ－、－Ｏ－等の二価の結合基で結合していてもよい。
Ｇ^１及びＧ^２はそれぞれ独立に、二価の芳香族基又は二価の脂環式炭化水素基を表す。ここで、該二価の芳香族基又は二価の脂環式炭化水素基に含まれる水素原子は、ハロゲン原子、炭素数１～４のアルキル基、炭素数１～４のフルオロアルキル基、炭素数１～４のアルコキシ基、シアノ基又はニトロ基に置換されていてもよく、該二価の芳香族基又は二価の脂環式炭化水素基を構成する炭素原子が、酸素原子、硫黄原子又は窒素原子に置換されていてもよい。
Ｌ^１、Ｌ^２、Ｂ^１及びＢ^２はそれぞれ独立に、単結合又は二価の連結基である。
ｋ、ｌは、それぞれ独立に０～３の整数を表し、１≦ｋ＋ｌの関係を満たす。ここで、２≦ｋ＋ｌである場合、Ｂ^１及びＢ^２、Ｇ^１及びＧ^２は、それぞれ互いに同一であってもよく、異なっていてもよい。
Ｅ^１及びＥ^２はそれぞれ独立に、炭素数１～１７のアルカンジイル基を表し、ここで、アルカンジイル基に含まれる水素原子は、ハロゲン原子で置換されていてもよく、該アルカンジイル基に含まれる－ＣＨ_２－は、－Ｏ－、－Ｓ－、－ＣＯＯ－で置換されていてもよく、－Ｏ－、－Ｓ－、－ＣＯＯ－を複数有する場合は互いに隣接しない。
Ｐ^１及びＰ^２は互いに独立に、重合性基又は水素原子を表し、少なくとも１つは重合性基である。］ When the λ/4 retardation layer included in the first retardation layer is a liquid crystal film including a liquid crystal cured film (liquid crystal film) obtained by polymerizing and curing a polymerizable liquid crystal compound, the polymerizable liquid crystal compound is preferably a liquid crystal having a T-shaped or H-shaped mesogen structure having further birefringence in the direction perpendicular to the molecular long axis direction from the viewpoint of expressing reverse wavelength dispersion, and more preferably a T-shaped liquid crystal from the viewpoint of obtaining stronger dispersion. Specifically, as the structure of the T-shaped liquid crystal, for example, a compound represented by the following formula (VIII) can be mentioned.

[In the formula (VIII),
Ar represents a divalent aromatic group which may have a substituent. The divalent aromatic group preferably contains at least one of a nitrogen atom, an oxygen atom, and a sulfur atom. When the divalent group Ar contains two or more aromatic groups, the two or more aromatic groups may be bonded to each other via a divalent bonding group such as a single bond, -CO-O-, or -O-.
G ¹ and G ² each independently represent a divalent aromatic group or a divalent alicyclic hydrocarbon group, wherein a hydrogen atom contained in the divalent aromatic group or the divalent alicyclic hydrocarbon group may be substituted with a halogen atom, an alkyl group having 1 to 4 carbon atoms, a fluoroalkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a cyano group, or a nitro group, and a carbon atom constituting the divalent aromatic group or the divalent alicyclic hydrocarbon group may be substituted with an oxygen atom, a sulfur atom, or a nitrogen atom.
L ¹ , L ² , B ¹ and B ² each independently represent a single bond or a divalent linking group.
k and l each independently represent an integer of 0 to 3, and satisfy the relationship 1≦k+l, where, when 2≦k+l, B ¹ and B ² , G ¹ and G ² may be the same as or different from each other.
^E1 and ^E2 each independently represent an alkanediyl group having 1 to 17 carbon atoms, in which a hydrogen atom contained in the alkanediyl group may be substituted with a halogen atom, and _-CH2- contained in the alkanediyl group may be substituted with -O-, -S- or -COO-, and when there are a plurality of -O-, -S- or -COO-, they are not adjacent to each other.
P ¹ and P ² each independently represent a polymerizable group or a hydrogen atom, and at least one of them is a polymerizable group.

G ¹ and G ² are each independently preferably 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 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 an unsubstituted 1,4-phenylenediyl group, or an unsubstituted 1,4-trans-cyclohexanediyl group.
At least one of a plurality of ^G1 and ^G2 is preferably a divalent alicyclic hydrocarbon group, and more preferably at least one of ^G1 and ^G2 bonded to ^L1 or ^L2 is a divalent alicyclic hydrocarbon group.

L ¹ and L ² are each 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 to R ^a8 each independently represent a single bond or an alkylene group having 1 to 4 carbon atoms, and R ^c and R ^d represent an alkyl group having 1 to 4 carbon atoms or a hydrogen atom. L ¹ and L ² are each independently more preferably a single bond, -O ^Ra2-1 -, -CH ₂ -, -CH ₂ CH ₂ -, -COOR ^a4-1 -, or OCOR ^a6-1 -. Here, R ^a2-1 , R ^a4-1 and R ^a6-1 each independently represent a single bond, -CH ₂ - or -CH 2 CH _{2 -} , and L ¹ and L ² each independently preferably represent a single bond, -O-, -CH ₂ CH ₂ -, -COO-, -COOCH ₂ CH ₂ - or OCO-.

B ¹ and B ² are each 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 to R ^a16 are each independently a single bond, or an alkylene group having 1 to 4 carbon atoms. B ¹ and B ² are each independently more preferably a single bond, -OR ^a10-1 -, -CH ₂ -, -CH ₂ CH ₂ -, -COOR ^a12-1 -, or OCOR ^a14-1 -. Here, R ^a10-1 , R ^a12-1 and R ^a14-1 each independently represent a single bond, -CH ₂ - or -CH ₂ CH ₂ -. B ¹ and B ² each independently represent more preferably a single bond, -O-, -CH ₂ CH ₂ -, -COO-, -COOCH ₂ CH ₂ -, -OCO- or OCOCH ₂ CH ₂ -.

From the viewpoint of expressing 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 preferable because they result in a symmetrical structure.

E ¹ and E ² each independently preferably represent an alkanediyl group having 1 to 17 carbon atoms, and more preferably an alkanediyl group having 4 to 12 carbon atoms.

Examples of the polymerizable group represented by ^P1 or ^P2 include an epoxy group, a vinyl group, a vinyloxy group, a 1-chlorovinyl group, an isopropenyl group, a 4-vinylphenyl group, an acryloyloxy group, a methacryloyloxy group, an oxiranyl group, and an oxetanyl group. Among these, an acryloyloxy group, a methacryloyloxy group, a vinyloxy group, an oxiranyl group, and an oxetanyl group are preferred, and an acryloyloxy group is more preferred.

It is preferable that Ar has at least one selected from an aromatic hydrocarbon ring which may have a substituent, an aromatic heterocycle which may have a substituent, and an electron-withdrawing group. Examples of the aromatic hydrocarbon ring include a benzene ring, a naphthalene ring, and an anthracene ring, and a benzene ring and a naphthalene ring are preferable. Examples of the aromatic heterocycle include a furan ring, a benzofuran ring, a pyrrole ring, an indole ring, a thiophene ring, a benzothiophene ring, a pyridine ring, a pyrazine ring, a pyrimidine ring, a triazole ring, a triazine ring, a pyrroline ring, an imidazole ring, a pyrazole ring, a thiazole ring, a benzothiazole ring, a thienothiazole ring, an oxazole ring, a benzoxazole ring, and a phenanthroline ring. Among them, it is preferable that Ar has a thiazole ring, a benzothiazole ring, or a benzofuran ring, and it is more preferable that Ar has a benzothiazole group. In addition, when Ar contains a nitrogen atom, it is preferable that the nitrogen atom has π electrons.

In formula (VIII), 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, even more preferably 14 or more, and particularly preferably 16 or more. It is also preferably 30 or less, more preferably 26 or less, and even more preferably 24 or less.

［式（Ａｒ－１）～式（Ａｒ－２３）中、
＊印は連結部を表し、
Ｚ^０、Ｚ^１及びＺ^２は、それぞれ独立に、水素原子、ハロゲン原子、炭素数１～１２のアルキル基、シアノ基、ニトロ基、炭素数１～１２のアルキルスルフィニル基、炭素数１～１２のアルキルスルホニル基、カルボキシル基、炭素数１～１２のフルオロアルキル基、炭素数１～６のアルコキシ基、炭素数１～１２のアルキルチオ基、炭素数１～１２のＮ－アルキルアミノ基、炭素数２～１２のＮ，Ｎ－ジアルキルアミノ基、炭素数１～１２のＮ－アルキルスルファモイル基又は炭素数２～１２のＮ，Ｎ－ジアルキルスルファモイル基を表す。
Ｑ^１及びＱ^２は、それぞれ独立に、－ＣＲ^２’Ｒ^３’－、－Ｓ－、－ＮＨ－、－ＮＲ^２’－、－ＣＯ－又はＯ－を表し、Ｒ^２’及びＲ^３’は、それぞれ独立に、水素原子又は炭素数１～４のアルキル基を表す。
Ｊ^１、及びＪ^２は、それぞれ独立に、炭素原子、又は窒素原子を表す。
Ｙ^１、Ｙ^２及びＹ^３は、それぞれ独立に、置換されていてもよい芳香族炭化水素基又は芳香族複素環基を表す。
Ｗ^１及びＷ^２は、それぞれ独立に、水素原子、シアノ基、メチル基又はハロゲン原子を表す。
ｍは０～６の整数を表す。］ Suitable examples of the aromatic group represented by Ar include the following groups.

[In formula (Ar-1) to formula (Ar-23),
* indicates the connection part.
Z ⁰ , Z ¹ and Z ² each independently represent 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.
Q ¹ and Q ² each independently represent -CR ^{2 '} R ^{3 '} -, -S-, -NH-, -NR ^{2 '} -, -CO- or O-, and R ² ' and R ^{3 '} each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
J ¹ and J ² each independently represent a carbon atom or a nitrogen atom.
Y ¹ , Y ² and Y ³ each independently represent an aromatic hydrocarbon group or an aromatic heterocyclic group which may be substituted.
W ¹ and W ² each independently represent a hydrogen atom, a cyano group, a methyl group or a halogen atom.
m represents an integer of 0 to 6.

Examples of the aromatic hydrocarbon group in ^Y1 , ^Y2 , and ^Y3 include aromatic hydrocarbon groups having 6 to 20 carbon atoms, such as a phenyl group, a naphthyl group, an anthryl group, a phenanthryl group, and a biphenyl group, of which a phenyl group and a naphthyl group are preferred, and a phenyl group is more preferred. Examples of the aromatic heterocyclic group include aromatic heterocyclic groups having 4 to 20 carbon atoms and containing at least one heteroatom, such as a nitrogen atom, an oxygen atom, or a sulfur atom, such as a furyl group, a pyrrolyl group, a thienyl group, a pyridinyl group, a thiazolyl group, and a benzothiazolyl group, of which a furyl group, a thienyl group, a pyridinyl group, a thiazolyl group, and a benzothiazolyl group are preferred.

^Y1 , ^Y2 and ^Y3 may each independently be an optionally substituted polycyclic aromatic hydrocarbon group or 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 assembly. The polycyclic aromatic heterocyclic group refers to a condensed polycyclic aromatic heterocyclic group or a group derived from an aromatic ring assembly.

Z ⁰ , Z ¹ and Z ² are each preferably independently 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, Z ⁰ is more preferably a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, or a cyano group, and Z ¹ and Z ² are more preferably a hydrogen atom, a fluorine atom, a chlorine atom, a methyl group, or a cyano group.

^Q1 and ^Q2 are preferably -NH-, -S-, ^-NR2'- or -O-, and R2 ^' is preferably a hydrogen atom. Among these, -S-, -O- or -NH- is particularly preferred.

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

In the compounds represented by formulae (Ar-16) to (Ar-23), Y ¹ may form an aromatic heterocyclic group together with the nitrogen atom to which it is bonded and Z ^0. Examples of the aromatic heterocyclic group include those described above as aromatic heterocyclic rings that Ar may have, such as a pyrrole ring, an imidazole ring, a pyrroline ring, a pyridine ring, a pyrazine ring, a pyrimidine ring, an indole ring, a quinoline ring, an isoquinoline ring, a purine ring, and a pyrrolidine ring. This aromatic heterocyclic group may have a substituent. In addition, Y ¹ may be, together with the nitrogen atom to which it is bonded and Z ⁰ , the aforementioned polycyclic aromatic hydrocarbon group or polycyclic aromatic heterocyclic group which may be substituted. Examples include a benzofuran ring, a benzothiazole ring, and a benzoxazole ring.

Among the polymerizable liquid crystal compounds, compounds having a maximum absorption wavelength of 300 to 400 nm are preferred. When a photopolymerization initiator is contained in the third composition containing the polymerizable liquid crystal compound, the polymerization reaction and gelation of the polymerizable liquid crystal compound may progress during long-term storage. However, if the maximum absorption wavelength of the polymerizable liquid crystal compound is 300 to 400 nm, even if the composition is exposed to ultraviolet light during storage, 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 can be effectively suppressed. Therefore, it is advantageous in terms of long-term stability of the third composition, and the alignment and uniformity of the film thickness of the liquid crystal cured film contained in the first retardation layer can be improved. The maximum absorption wavelength of the polymerizable liquid crystal compound can be measured using a UV-visible spectrophotometer in a solvent. The solvent is a solvent that can dissolve the polymerizable liquid crystal compound, and examples of the solvent include chloroform.

The content of the polymerizable liquid crystal compound in the third composition is, for example, 70 to 99.5 parts by mass, preferably 80 to 99 parts by mass, more preferably 85 to 98 parts by mass, and even more preferably 90 to 95 parts by mass, based on 100 parts by mass of the solid content of the third composition. If the content of the polymerizable liquid crystal compound is within the above range, it is advantageous from the viewpoint of the alignment of the obtained liquid crystal cured film. In this specification, the solid content of the third composition means all components of the third composition excluding volatile components such as organic solvents.

The retardation layer (the retardation layer constituting the first retardation layer or the second retardation layer) which is a liquid crystal film may include a third alignment layer. The third alignment layer may be selected according to the direction in which the liquid crystal compound is aligned, and may be a vertical alignment layer or a horizontal alignment layer. If the third alignment layer is a material that exhibits horizontal alignment as an alignment control force, the liquid crystal compound can form a horizontal alignment or a hybrid alignment, and if the third alignment layer is a material that exhibits vertical alignment, the liquid crystal compound can form a vertical alignment or an inclined alignment. The expressions horizontal, vertical, and the like represent the direction of the long axis of the aligned liquid crystal compound when the plane of the first retardation layer or the second retardation layer is used as a reference. For example, vertical alignment means that the long axis of the aligned liquid crystal compound is aligned in a direction perpendicular to the plane of the first retardation layer or the second retardation layer. The term "vertical" here means 90°±20° with respect to the plane of the first retardation layer or the second retardation layer. Examples of the third alignment layer include those described for the first alignment layer and the second alignment layer.

The thickness of the liquid crystal film is preferably 0.5 μm or more and 5 μm or less, and more preferably 1 μm or more and 3 μm or less.

(Laminating layer)
The attachment layer is a pressure-sensitive adhesive layer or an adhesive layer.

When the pasting layer is an adhesive layer, it is an adhesive layer formed using an adhesive composition. The adhesive composition or the reaction product of the adhesive composition exhibits adhesive properties when it is attached to an adherend, and is known as a pressure-sensitive adhesive. In addition, the adhesive layer formed using the active energy ray-curable adhesive composition described below can be irradiated with active energy rays to adjust the degree of crosslinking and adhesive strength.

As the adhesive composition, any adhesive having excellent optical transparency that has been known in the art can be used without any particular restrictions. For example, an adhesive composition containing a base polymer such as an acrylic polymer, a urethane polymer, a silicone polymer, or a polyvinyl ether can be used. The adhesive composition may be an active energy ray curable adhesive composition or a heat curable adhesive composition. Among these, an adhesive composition having an acrylic resin as a base polymer, which is excellent in transparency, adhesive strength, removability (reworkability), weather resistance, heat resistance, etc., is preferable. The adhesive layer is preferably composed of a reaction product of an adhesive composition containing a (meth)acrylic resin, a crosslinking agent, and a silane compound, and may contain other components.

The adhesive composition for forming the adhesive layer may contain a base polymer such as an acrylic polymer, a urethane polymer, a silicone polymer, or a polyvinyl ether. The adhesive composition may be an active energy ray curable adhesive, a heat curable adhesive, or the like. Among these, an adhesive having a (meth)acrylic resin as a base polymer, which is excellent in transparency, adhesive strength, removability (reworkability), weather resistance, heat resistance, and the like, is preferred. The adhesive layer is preferably composed of a reaction product of an adhesive containing a (meth)acrylic resin, a crosslinking agent, and a silane compound, and may contain other components.

The adhesive layer may be formed using an active energy ray curable adhesive. The active energy ray curable adhesive is prepared by blending an ultraviolet-curable compound such as a multifunctional acrylate with the above-mentioned adhesive composition, forming an adhesive layer, and then curing the adhesive layer by irradiating it with ultraviolet light, thereby forming a harder adhesive layer. The active energy ray curable adhesive has the property of being cured by irradiation with energy rays such as ultraviolet rays and electron beams. The active energy ray curable adhesive has adhesiveness even before irradiation with energy rays, and therefore has the property of being able to adhere to the adherend and to be cured by irradiation with energy rays to adjust the adhesion.

The thickness of the adhesive layer is not particularly limited, but is usually 5 μm or more and 300 μm or less, and may be 10 μm or more and 250 μm or less, 15 μm or more and 100 μm or less, or 20 μm or more and 50 μm or less.

When the lamination layer is an adhesive layer, the adhesive layer can be formed using an adhesive composition. The adhesive composition for forming the adhesive layer is an adhesive other than a pressure-sensitive adhesive (adhesive), such as a water-based adhesive or an active energy ray-curable adhesive.

An example of a water-based adhesive is an adhesive in which polyvinyl alcohol resin is dissolved or dispersed in water. There are no particular limitations on the drying method when using a water-based adhesive, but for example, a drying method using a hot air dryer or an infrared dryer can be used.

Examples of active energy ray-curable adhesives include solvent-free active energy ray-curable adhesives that contain a curable compound that cures when exposed to active energy rays such as ultraviolet light, visible light, electron beams, and X-rays. By using a solvent-free active energy ray-curable adhesive, it is possible to improve the adhesion between layers.

When the lamination layer is an adhesive layer, the thickness 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.

(Manufacturing method of wound body)
The method for producing the wound body described above includes the steps of:
A step (1) of unwinding and transporting the first base material layer 12 from a first base material roll around which the first base material layer 12 is wound;
A step (2) of forming an optically absorptive anisotropic layer 11 on a first base layer 12 to obtain a long laminate 1, 2;
It is preferable that the method further includes a step (3) of winding the long laminates 1 and 2 into a roll.

The manufacturing method for the above-mentioned rolled body is a so-called roll-to-roll manufacturing method in which the optically absorbing anisotropic layer 11 is continuously formed while transporting the long first substrate layer 12.

The step (2) of the method for producing the wound body includes:
A step (2a) of applying a first composition (composition) containing one or more dichroic dyes onto a first substrate layer 12 to form a coating layer;
It is preferable that the method further comprises a step (2b) of drying the coating layer.

When the first composition contains a polymerizable liquid crystal compound, the above step (2) preferably includes, following step (2b), step (2c) of irradiating the dried coating layer with active energy rays. Step (2c) allows the polymerizable liquid crystal compound in the coating layer to be polymerized and cured.

The steps (2a) to (2c) can be performed using the method described above for forming the optically absorbing anisotropic layer 11. By adjusting the manufacturing conditions, etc., of the steps (2a) to (2c), it becomes easier to obtain a roll having an optically absorbing anisotropic layer 11 that satisfies the relationship of the above formula (I).

The roll of the long laminate 2 can be obtained, for example, by manufacturing the long laminate 1, laminating the anti-reflection film 20 on the long laminate 1 to obtain the long laminate 2, and then rolling it up.

(Organic EL display device)
The organic EL display device can have a light absorbing anisotropic layer contained in a laminate cut out from the long laminate 1 of the above-mentioned roll, an antireflection film, and an image display element. The antireflection film can be one described above. The light absorbing anisotropic layer and the antireflection film may be laminated as a long body, or may be laminated after being cut out.

The organic EL display device may have an optically absorbing anisotropic layer and an anti-reflection film contained in a laminate cut out from the long laminate 2 of the above-mentioned roll, and an image display element.

The first base layer included in the long laminate may be incorporated into a display device together with the light absorbing anisotropic layer, or may be peeled off and removed. The light absorbing anisotropic layer and the anti-reflection film are cut into a sheet of a size that matches the size of the display device, and then laminated onto the image display element.

In an organic EL display device, the light absorbing anisotropic layer, the anti-reflection film, and the image display element can be arranged in this order from the viewing side.

The present invention will be explained in more detail below with reference to examples and comparative examples, but the present invention is not limited to these examples. In the examples and comparative examples, "%" and "parts" are by mass % and parts by mass unless otherwise specified.

[Preparation of anti-reflection film]
Hereinafter, a procedure for producing the polarizing plate, the first retardation layer, and the second retardation layer constituting the antireflection film will be described.

(Preparation of Polarizing Plate)
A polyvinyl alcohol-based resin film having an average degree of polymerization of about 2,400 and a thickness of 75 μm and a saponification degree of 99.9 mol% or more was immersed in pure water at a temperature of 30° C., and then immersed in an aqueous solution having a weight ratio of iodine/potassium iodide/water of 0.02/2/100 at a temperature of 30° C. to perform iodine dyeing (iodine dyeing step). The polyvinyl alcohol-based resin film that had undergone the iodine dyeing step was immersed in an aqueous solution having a weight ratio of potassium iodide/boric acid/water of 12/5/100 at a temperature of 56.5° C. to perform boric acid treatment (boric acid treatment step). The polyvinyl alcohol-based resin film that had undergone the boric acid treatment step was washed with pure water at a temperature of 8° C., and then dried at a temperature of 65° C. to obtain a polarizing layer (thickness 27 μm after stretching) in which iodine was adsorbed and aligned on the polyvinyl alcohol-based resin film. At this time, stretching was performed in the iodine dyeing step and the boric acid treatment step. The total stretching ratio in this stretching was 5.3 times.

The polarizing layer obtained above and a saponified triacetyl cellulose film (Konica Minolta's "KC4UYTAC", thickness 40 μm) were bonded together using a nip roll with a water-based adhesive. The resulting laminate was dried at 60°C for 2 minutes while maintaining the tension at 430 N/m to produce a polarizing plate having a triacetyl cellulose film as a protective film on one side. The water-based adhesive was prepared by adding 3 parts of carboxyl-modified polyvinyl alcohol (Kuraray's "Kuraray Poval KL318") and 1.5 parts of water-soluble polyamide epoxy resin (Sumika Chemtex's "Sumirez Resin 650", an aqueous solution with a solids concentration of 30%) to 100 parts of water.

(Preparation of the first retardation layer)
A composition for forming a horizontal alignment layer was prepared by mixing 5 parts of a photoalignment material (weight average molecular weight: 30,000) having the structure shown below with 95 parts of cyclopentanone (solvent) and stirring the resulting mixture at a temperature of 80° C. for 1 hour.

重合性液晶化合物（Ｘ２）：

Polymerizable liquid crystal compound (X1) and polymerizable liquid crystal compound (X2) having the structures shown below were prepared. Polymerizable liquid crystal compound (X1) was produced according to the method described in JP-A-2010-31223. Polymerizable liquid crystal compound (X2) was produced according to the method described in JP-A-2009-173893.
Polymerizable liquid crystal compound (X1):

Polymerizable liquid crystal compound (X2):

A solution was obtained by dissolving 1 mg of polymerizable liquid crystal compound (X1) in 50 mL of tetrahydrofuran. The obtained solution was placed in a measurement cell with an optical path length of 1 cm, and the measurement sample was placed in an ultraviolet-visible spectrophotometer (Shimadzu Corporation, "UV-2450") to measure the absorption spectrum. The wavelength at which the maximum absorbance was obtained was read from the obtained absorption spectrum, and the maximum absorption wavelength λmax in the wavelength range of 300 to 400 nm was 350 nm.

The polymerizable liquid crystal compound (X1) and the polymerizable liquid crystal compound (X2) were mixed in a mass ratio of 90:10 to obtain a mixture. To 100 parts of the obtained 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)butan-1-one ("Irgacure (registered trademark) 369 (Irg369)" manufactured by BASF Japan Ltd.) were added as a photopolymerization initiator. Furthermore, N-methyl-2-pyrrolidone (NMP) was added so that the solid content concentration was 13%. The mixture was stirred at a temperature of 80°C for 1 hour to prepare a composition for forming a first liquid crystal film.

After a corona treatment was performed on a COP film ("ZF-14-50" manufactured by Zeon Corporation), the composition for forming a horizontal alignment layer prepared above was applied using a bar coater, dried at a temperature of 80°C for 1 minute, and exposed to polarized UV light using a polarized UV irradiation device ("SPOT CURE SP-9" manufactured by Ushio Inc.) at a wavelength of 313 nm with an integrated light amount of 100 mJ/ ^cm2 to form a horizontal alignment layer.

Next, the composition for forming the first liquid crystal layer prepared above was applied onto the horizontal alignment layer using a bar coater, and heated at a temperature of 120°C for 60 seconds. After that, ultraviolet light was irradiated from the surface onto which the composition was applied using a high-pressure mercury lamp ("Uniqure VB-15201BY-A" manufactured by Ushio Inc.) (under a nitrogen atmosphere, accumulated light amount at a wavelength of 365 nm: 500 mJ/cm ² ) to form a cured layer of the polymerizable liquid crystal compound, thereby producing a first retardation layer having a layer structure of a horizontal alignment layer and a cured layer.

After confirming that the COP film had no phase difference, Re(450) and Re(550) were measured using KOBRA-WPR manufactured by Oji Scientific Instruments Co., Ltd., and it was found that the relationship between the following formulas (III) to (V) was satisfied.
100 nm < Re (550) < 160 nm (III)
Re(450)/Re(550)≦1.0 (IV)
1.00≦Re(650)/Re(550) (V)
[In the formulas (III) to (V),
Re(λ) represents the in-plane retardation value of the first retardation layer at a wavelength λ [nm].

(Preparation of the second retardation layer)
A composition for forming a vertical alignment layer was prepared by mixing 0.5 parts of polyimide (Sunever SE-610 manufactured by Nissan Chemical Industries, Ltd.), 72.3 parts of N-methyl-2-pyrrolidone, 18.1 parts of 2-butoxyethanol, 9.1 parts of ethylcyclohexane, and 0.01 parts of DPHA (manufactured by Shin-Nakamura Chemical Co., Ltd.).

Polymerizable liquid crystal compound LC242 having the structure shown below: To 100 parts of Paliocolor LC242 (registered trademark of BASF Corporation), 0.1 parts of a leveling agent ("F-556" manufactured by DIC Corporation) and 3 parts of a polymerization initiator Irg369 were added, and cyclopentanone was added so that the solid content concentration became 13%, and these were mixed to obtain a composition for forming a second liquid crystal layer.

A COP film (Zeon Corporation, "ZF-14-23") was subjected to a corona treatment. The composition for forming the vertical alignment layer prepared above was applied to the corona-treated COP film using a bar coater, and the film was dried at a temperature of 80°C for 1 minute to obtain a vertical alignment layer. The film thickness of the obtained vertical alignment layer was measured with an ellipsometer and found to be 0.2 μm.

Next, the composition for forming the second liquid crystal layer prepared above was applied onto the vertical alignment layer, and dried at a temperature of 80° C. for 1 minute. Then, a cured product layer of the polymerizable liquid crystal compound was formed by irradiating ultraviolet light under conditions of an integrated light quantity of 500 mJ/cm ² at a wavelength of 365 nm under a nitrogen atmosphere using a high-pressure mercury lamp ("Unicur VB-15201BY-A" manufactured by Ushio Inc.), thereby producing a second retardation layer having a layer structure of a vertical alignment layer and a cured product layer. The second retardation layer was a positive C plate.

(Preparation of anti-reflection film)
After performing a corona treatment on the first retardation layer on the COP film, the first retardation layer and the polarizing plate were bonded together via an adhesive (manufactured by Lintec, pressure-sensitive adhesive, thickness 25 μm) so that the polarizing layer side of the polarizing plate prepared above was the first retardation layer side to obtain a laminate. In the laminate, the angle between the absorption axis of the polarizing layer and the slow axis of the first retardation layer was set to 45°. Next, the COP film side on which the first retardation layer of this laminate was formed and the second retardation layer on the COP film were subjected to a corona treatment, and then bonded together via an adhesive (manufactured by Lintec, pressure-sensitive adhesive, thickness 25 μm) to produce an anti-reflection film as an elliptical polarizing plate.

Comparative Example 1
(Preparation of First Composition (1))
To 100 parts of a mixture of polymerizable liquid crystal compounds obtained by mixing the polymerizable liquid crystal compound (Y1) and the polymerizable liquid crystal compound (Y2) shown below in a mass ratio of 75:25, 0.25 parts of a leveling agent "F-556" (manufactured by DIC Corporation), 0.5 parts of a dichroic dye A, 0.5 parts of a dichroic dye B, and 6 parts of 2-dimethylamino-2-benzyl-1-(4-morpholinophenyl)butan-1-one (BASF Japan Ltd. "Irgacure (registered trademark) 369 (Irg369)") as a photopolymerization initiator were added. Furthermore, o-xylene was added so that the solid content concentration was 14%. After stirring this mixture at a temperature of 80°C for 30 minutes, a first composition (1) for forming a light absorption anisotropic layer was obtained. In the first composition (1), the total mass of the dichroic dye relative to the mass of the mixture of polymerizable liquid crystal compounds was 1.0 mass%.

The polymerizable liquid crystal compounds (Y1) and (Y2) shown below were synthesized according to the method described in Lub et al., Recl. Trav. Chim. Pays-Bas, 115, 321-328 (1996).

二色性色素Ｂ：特許第６７２８５８１号公報の段落［０１４５］に記載のもの

The dichroic dyes A and B used were the compounds described below.
Dichroic dye A: one described in paragraph [0231] of JP2020-76920A

Dichroic dye B: one described in paragraph [0145] of Japanese Patent No. 6728581

[Measurement of phase transition temperature]
A mixture of polymerizable liquid crystal compounds was obtained by mixing the polymerizable liquid crystal compound (Y1) and the polymerizable liquid crystal compound (Y2) in a mass ratio of 75:25. The mixture was applied onto an alignment layer formed on a glass substrate, and while heating the mixture, the texture was observed using a polarizing microscope (BX-51, manufactured by Olympus Corporation) to confirm the phase transition temperature. After heating to a temperature of 120°C, the mixture was cooled and observed, and it was confirmed that the phase transition occurred to a nematic phase at a temperature of 103°C, to a smectic A phase at a temperature of 95°C, and to a smectic B phase at a temperature of 77°C.

(Preparation of first substrate layer (1))
The following components were mixed and stirred at 80° C. for 1 hour to prepare a curable composition.
Dipentaerythritol hexaacrylate: 50 parts Urethane acrylate (Daicel Allnex Co., Ltd. "Ebecryl 4858"): 50 parts 2-[4-(methylthio)benzoyl]-2-(4-morpholinyl)propane (BASF Co., Ltd. "Irgacure 907", radical polymerization initiator): 3 parts Methyl ethyl ketone (solvent): 10 parts

A release polyethylene terephthalate (PET) film ("SP-PLR382050" manufactured by Lintec Corporation, thickness 38 μm) having a width of 715 mm was continuously unwound from a roll body at a speed of 8 m/min, and the release PET film was applied to the release-treated surface thereof using a slot die coater to form a surface coating layer. This surface coating layer was irradiated with ultraviolet light at an exposure dose of 500 mJ/cm ² (based on 365 nm) to form a hard coat (HC) layer having a thickness of 2 μm, thereby obtaining a first substrate layer (1). The obtained first substrate layer (1) was wound into a roll to obtain a substrate roll. The length of the first substrate layer (1) wound around the substrate roll was 250 m.

(Preparation of Long Laminate (1) and Rolled Body (1))
The first substrate layer (1) was continuously unwound from the substrate roll (1) obtained above at a speed of 10 m/min and a tension of 120 N, and the first composition (1) prepared above was discharged onto the hard coat layer of the first substrate layer (1) using a slot die coater at a flow rate of 57 ml/min to form a coating layer having a width of 655 mm at the center of the first substrate layer (1) (width 715 mm). Subsequently, the first substrate layer was transported through a first ventilation drying oven set at a temperature of 100 ° C. for 30 seconds (first drying step), then through a second ventilation drying oven set at a temperature of 100 ° C. for 30 seconds (second drying step), and further through a third ventilation drying oven set at a temperature of 100 ° C. for 30 seconds (third drying step) to remove the solvent. The dried coating layer was irradiated with ultraviolet light at an exposure dose of 410 mJ/ ^cm2 (based on 365 nm) to cure the polymerizable liquid crystal compound in the coating layer and form a light absorption anisotropic layer, thereby obtaining a long laminate (1) having a length of 200 m. This long laminate (1) was wound into a roll to obtain a rolled body (1).

(Preparation of Antireflection Laminate (1))
The long laminate (1) unwound from the roll (1) was cut out to obtain a sheet-like laminate, and the light absorption anisotropic layer side of this sheet-like laminate was subjected to a corona treatment. The antireflection film prepared above was laminated on the sheet-like laminate via an adhesive (Lintec Corporation, pressure-sensitive adhesive, thickness 25 μm) so that the polarizing plate side was the bonding surface, to obtain an antireflection laminate (1).

Comparative Example 2
(Preparation of First Composition (2))
A first composition (2) was prepared in the same manner as in the preparation of the first composition (1), except that the blending amounts of the dichroic dye A and the dichroic dye B were changed to 1.5 parts of the dichroic dye A and 1.5 parts of the dichroic dye B. In the first composition (2), the total mass of the dichroic dyes relative to the mass of the mixture of polymerizable liquid crystal compounds was 3.0% by mass.

(Preparation of Long Laminate (2) and Rolled Body (2))
A long laminate (2) and a wound body (2) were obtained in the same manner as in the preparation of the long laminate (1) and the wound body (1), except that the first composition (1) was changed to the first composition (2).

(Preparation of Antireflection Laminate (2))
An antireflection laminate (2) was obtained in the same manner as in the preparation of the antireflection laminate (1), except that the long laminate (1) was changed to a long laminate (2) unwound from a roll (2).

Comparative Example 3
(Preparation of Long Laminate (3) and Rolled Body (3))
A long laminate (3) and a rolled body (3) were obtained in the same manner as in the preparation of the long laminate (2) and the rolled body (2), except that a static elimination treatment was performed on the hard coat layer side of the first base layer (1) using a static elimination bar before applying the first composition (2) to the first base layer (1).

(Preparation of Antireflection Laminate (3))
An antireflection laminate (3) was obtained in the same manner as in the preparation of the antireflection laminate (1), except that the long laminate (1) was changed to a long laminate (3) unwound from a roll (3).

Example 1
(Preparation of Long Laminate (4) and Rolled Body (4))
A long laminate (4) and a rolled body (4) were obtained in the same manner as in the preparation of the long laminate (3) and the rolled body (3), except that the temperatures in the first drying step to the third drying step were changed to those shown in Table 1.

(Preparation of Antireflection Laminate (4))
An antireflection laminate (4) was obtained in the same manner as in the preparation of the antireflection laminate (1), except that the long laminate (1) was changed to a long laminate (4) unwound from a roll (4).

Example 2
(Preparation of Long Laminate (5) and Rolled Body (5))
A long laminate (5) and a roll (5) were obtained in the same manner as in the preparation of the long laminate (4) and the roll (4), except that the backup roll was cooled to a temperature of 20°C when exposing the dried coating layer to ultraviolet light.

(Preparation of Antireflection Laminate (5))
An antireflection laminate (5) was obtained in the same manner as in the preparation of the antireflection laminate (1), except that the long laminate (1) was changed to a long laminate (5) unwound from a roll (5).

[Examples 3 and 4]
(Preparation of Long Laminates (6) and (7) and Wound Bodies (6) and (7))
Long laminates (6) and (7) and wound bodies (6) and (7) were obtained in the same manner as in the preparation of the long laminate (5) and wound body (5), except that the temperatures in the first drying step to the third drying step were changed to those shown in Table 1.

(Preparation of anti-reflection laminates (6) and (7))
Antireflection laminates (6) and (7) were obtained in the same manner as in the preparation of the antireflection laminate (1), except that the long laminate (1) was changed to the long laminates (6) and (7) unwound from the rolls (6) and (7), respectively.

Example 5
(Preparation of first substrate layer (2))
A protective film (Pf) having a PET film (thickness: 38 μm) and an acrylic adhesive layer (thickness: 15 μm) was attached to the release PET film side of the first base layer (1) to prepare a first base layer (2).

(Preparation of Long Laminate (8) and Rolled Body (8))
A long laminate (8) and a rolled body (8) were obtained in the same manner as in the preparation of the long laminate (6) and the rolled body (6), except that the first substrate layer (1) was changed to the first substrate layer (2). The first composition (2) was applied to the hard coat layer side of the first substrate layer (2).

(Preparation of anti-reflection laminate (8))
An antireflection laminate (8) was obtained in the same manner as in the preparation of the antireflection laminate (1), except that the long laminate (1) was changed to a long laminate (8) unwound from a roll (8).

Comparative Example 4
(Preparation of first substrate layer (3))
A triacetyl cellulose (TAC) film (Konica Minolta KC4UY-TAC, thickness 25 μm) was prepared as the first base layer (3).

(Preparation of Long Laminate (9) and Rolled Body (9))
A long laminate (9) and a wound body (9) were obtained in the same manner as in the preparation of the long laminate (6) and the wound body (6), except that the first base material layer (1) was changed to the first base material layer (3).

(Preparation of Antireflection Laminate (9))
An antireflection laminate (9) was obtained in the same manner as in the preparation of the antireflection laminate (1), except that the long laminate (1) was changed to a long laminate (9) unwound from a roll (9).

Example 6
(Preparation of first substrate layer (4))
A triacetyl cellulose (TAC) film (KC4UY-TAC, manufactured by Konica Minolta, Inc., thickness 40 μm) was prepared as the first base layer (4).

(Preparation of Long Laminate (10) and Rolled Body (10))
A long laminate (10) and a rolled body (10) were obtained in the same manner as in the preparation of the long laminate (6) and the rolled body (6), except that the first base material layer (1) was changed to the first base material layer (4).

(Preparation of anti-reflection laminate (10))
An antireflection laminate (10) was obtained in the same manner as in the preparation of the antireflection laminate (1), except that the long laminate (1) was changed to a long laminate (10) unwound from a roll (10).

Example 7
(Preparation of first substrate layer (5))
A triacetyl cellulose (TAC) film (Konica Minolta KC4UY-TAC, thickness 40 μm) was laminated with a protective film (Pf) having a PET film (thickness: 38 μm) and an acrylic adhesive layer (thickness: 15 μm) to prepare a first base layer (5).

(Preparation of Long Laminate (11) and Wound Body (11))
A long laminate (11) and a rolled body (11) were obtained in the same manner as in the preparation of the long laminate (6) and the rolled body (6), except that the first base material layer (1) was changed to the first base material layer (5).

(Preparation of anti-reflection laminate (11))
An antireflection laminate (11) was obtained in the same manner as in the preparation of the antireflection laminate (1), except that the long laminate (1) was changed to a long laminate (11) unwound from a roll (11). The first composition (2) was applied to the TAC film side (opposite the protective film side) of the first base layer (5).

Example 8
(Preparation of First Composition (3))
A first composition (3) was prepared in the same manner as in the preparation of the first composition (2), except that o-xylene was added so that the solid content concentration was 7%.

(Preparation of Long Laminate (12) and Rolled Body (12))
A long laminate (12) and a wound body (12) were obtained in the same manner as in the preparation of the long laminate (8) and the wound body (8), except that the first composition (2) was changed to the first composition (3).

(Preparation of anti-reflection laminate (12))
An antireflection laminate (12) was obtained in the same manner as in the preparation of the antireflection laminate (1), except that the long laminate (1) was changed to a long laminate (12) unwound from a roll (12).

Example 9
(Preparation of First Composition (4))
A first composition (4) was prepared in the same manner as in the preparation of the first composition (1), except that the blending amounts of the dichroic dye A and the dichroic dye B were changed to 1.87 parts of the dichroic dye A and 1.87 parts of the dichroic dye B. In the first composition (4), the total mass of the dichroic dyes relative to the mass of the mixture of polymerizable liquid crystal compounds was 3.75% by mass.

(Preparation of Long Laminate (13) and Rolled Body (13))
A long laminate (13) and a wound body (13) were obtained in the same manner as in the preparation of the long laminate (8) and the wound body (8), except that the first composition (2) was changed to the first composition (4).

(Preparation of anti-reflection laminate (13))
An antireflection laminate (13) was obtained in the same manner as in the preparation of the antireflection laminate (1), except that the long laminate (1) was changed to a long laminate (13) unwound from a roll (13).

Example 10
(Preparation of First Composition (5))
A first composition (5) was prepared in the same manner as in the preparation of the first composition (1), except that the blending amounts of the dichroic dye A and the dichroic dye B were changed to 1.25 parts of the dichroic dye A and 1.25 parts of the dichroic dye B. In the first composition (5), the total mass of the dichroic dyes relative to the mass of the mixture of polymerizable liquid crystal compounds was 2.5 mass%.

(Preparation of Long Laminate (14) and Rolled Body (14))
A long laminate (14) and a wound body (14) were obtained in the same manner as in the preparation of the long laminate (8) and the wound body (8), except that the first composition (2) was changed to the first composition (5).

(Preparation of anti-reflection laminate (14))
An antireflection laminate (14) was obtained in the same manner as in the preparation of the antireflection laminate (1), except that the long laminate (1) was changed to a long laminate (14) unwound from a roll (14).

Example 11
(Preparation of first composition (6))
A first composition (6) was prepared in the same manner as in the preparation of the first composition (1), except that the polymerizable liquid crystal compounds (Y1) and (Y2) were changed to the following polymerizable liquid crystal compound (Y3).

[Measurement of phase transition temperature]
The phase transition temperature was confirmed by observing the texture of the polymerizable liquid crystal compound (Y3) applied on the alignment layer formed on the glass substrate using a polarizing microscope (BX-51, manufactured by Olympus Corporation) while heating the compound. After heating to 120°C, the compound was cooled and observed. It was confirmed that the compound underwent a phase transition to a nematic phase at a temperature of 113°C, a phase transition to a smectic A phase at a temperature of 110°C, and a phase transition to a smectic B phase at a temperature of 90°C.

(Preparation of Long Laminate (15) and Rolled Body (15))
A long laminate (15) and a rolled body (15) were obtained in the same manner as in the preparation of the long laminate (8) and the rolled body (8), except that the first composition (2) was changed to the first composition (6) and the temperatures in the first drying step to the third drying step were changed to the temperatures shown in Table 4.

(Preparation of anti-reflection laminate (15))
An antireflection laminate (15) was obtained in the same manner as in the preparation of the antireflection laminate (1), except that the long laminate (1) was changed to a long laminate (15) unwound from a roll (15).

Example 12
(Preparation of Long Laminate (16) and Rolled Body (16))
A long laminate (16) and a rolled body (16) were obtained in the same manner as in the preparation of the long laminate (15) and the rolled body (15), except that the temperatures in the first drying step to the third drying step were changed to those shown in Table 4.

(Preparation of anti-reflection laminate (16))
An antireflection laminate (16) was obtained in the same manner as in the preparation of the antireflection laminate (1), except that the long laminate (1) was changed to a long laminate (16) unwound from a roll (16).

[Reference Example 1]
(Preparation of a sheet-laminate)
The first base layer (1) unwound from the base roll was cut into a size of 100 mm x 120 mm, and the first composition (2) was applied onto the hard coat layer of the cut-out first base layer (1) using a bar coater, and dried for 1 minute in a drying oven set at a temperature of 100° C. Next, the polymerizable liquid crystal compound in the coating layer was cured by irradiating with ultraviolet light (under a nitrogen atmosphere, wavelength: 365 nm, integrated light amount at a wavelength of 365 nm: 500 mJ/cm ² ) using a high-pressure mercury lamp ("Unicur VB-15201BY-A" manufactured by Ushio Inc.), thereby forming a light absorption anisotropic layer, and a sheet-leaf laminate having a light absorption anisotropic layer on the first base layer (1) was obtained.

[Measurement of absorbance of optically absorptive anisotropic layer]
A total of 10 measurement points _P10 were set for each of the long laminates (1) to (16) unwound from the rolls (1) to (16) produced in the Examples and Comparative Examples, as follows. The long laminate unwound from the roll was unwound in the length direction (winding direction) by about 1 m, and a total of seven measurement points were set as the measurement points in the width direction of the optically absorbing anisotropic layer, including one point at the center position in the width direction at this position and three points set at equal intervals between the center and positions 2.5 cm inward from each of the two ends from this center position toward both ends in the width direction. In addition, three points set at intervals of 30 cm from the one point at the center position set in the width direction of the optically absorbing anisotropic layer toward the winding axis side of the roll (the opposite side to the unwinding side) along the length direction were set as the measurement points in the length direction of the optically absorbing anisotropic layer. The laminate of the optically absorbing anisotropic layer and the first base layer was cut into a size of 4 cm x 4 cm so that each of the total of 10 measurement points _P10 was the center. The cut-out laminate was attached to glass (size: 4 cm × 4 cm, thickness: 0.7 mm) via an adhesive (pressure-sensitive adhesive, manufactured by Lintec Corporation, thickness 25 μm) so that the light absorption anisotropic layer side became the bonding surface, and the release PET film of the first base layer was peeled off and removed to obtain a measurement sample (A).

The measurement sample (A) was set in an ultraviolet-visible spectrophotometer (Shimadzu Corporation, "UV-2450"), and the absorbance at a wavelength of 800 nm was corrected to zero, and then the absorbance Ax was measured. The measurement sample (A) was also set inclined in the ultraviolet-visible spectrophotometer, and the absorbance at a wavelength of 800 nm was corrected to zero, and then the absorbance Ax (z = 50°) was measured. The absorbance Ax is the absorbance of the absorption maximum wavelength in the wavelength range of 380 nm to 780 nm inclusive of the optically absorptive anisotropic layer, and is the absorbance of linearly polarized light vibrating in the x-axis direction, and the absorbance Ax (z = 50°) is the absorbance of the absorption maximum wavelength, and is the absorbance of linearly polarized light vibrating in the x-axis direction when the optically absorptive anisotropic layer is rotated 50° around the y-axis as the rotation axis. The x-axis is an arbitrary direction in the plane of the optically absorptive anisotropic layer, and the y-axis is a direction perpendicular to the x-axis in the plane of the optically absorptive anisotropic layer. Note that the first base layer did not have significant absorption at the above absorption maximum wavelength.

The absorbance Ax measured for each measurement sample (A) was averaged to calculate the absorbance Ax _av . The maximum value Ax _max (z = 50°) and the minimum value Ax _min (z = 50°) of the absorbance Ax (z = 50°) measured for each measurement sample were determined, and Ax _max (z = 50°)/Ax _min (z = 50°) was calculated. The results are shown in Tables 1 to 4.

For the sheet laminate produced in Reference Example 1, 10 sheets of the sheet laminate were prepared, and the absorbance Ax _av was calculated by averaging the absorbance Ax measured for each of the 10 sheets of the sheet laminate. In addition, the absorbance Ax (z=50°) was measured for the 10 sheets of the sheet laminate, and Ax _max (z=50°)/Ax _min (z=50°) was calculated from the maximum and minimum values.

In each measurement sample (A) and the sheet laminate of Reference Example 1, Ax(z=50°)/Ax was 5 or more.

[Measurement of thickness of optically absorptive anisotropic layer]
The thickness of the optically absorptive anisotropic layer of the laminate at each of the 10 measurement points _P10 cut out in the above [Measurement of absorbance of optically absorptive anisotropic layer] was measured with an interference film thickness meter. The measured thicknesses were averaged to obtain the thickness of the optically absorptive anisotropic layer in the long laminate. The results are shown in Tables 1 to 4.

For the laminate produced in Reference Example 1, 10 laminates were prepared, the thickness of the optically absorbing anisotropic layer was measured for each of the 10 laminates, and the average value was taken as the thickness of the laminate.

[Evaluation of display characteristics]
The antireflection film prepared above was cut into a size of 4 cm x 4 cm. From each of the long laminates (1) to (16) prepared in the Examples and Comparative Examples, a laminate was cut out at each of the 10 measurement points _P10 as described above in [Measurement of absorbance of light-absorption anisotropic layer]. The light-absorption anisotropic layer side of this laminate was subjected to a corona treatment, and the antireflection film cut out above was laminated via an adhesive (manufactured by Lintec Corporation, pressure-sensitive adhesive, thickness 25 μm) so that the polarizing plate side was the bonding surface, to obtain a measurement sample (B).

For Reference Example 1, measurement sample (B) was prepared in the same manner as above, except that the laminates cut out from the long laminates (1) to (16) were replaced with the sheet-like laminates prepared in Reference Example 1.

The front glass and the polarizing plate were removed from ROYOLE's "FlexPai" to take out the display device. Next, each measurement sample (B) was attached to the display device via an adhesive (25 μm pressure-sensitive adhesive manufactured by Lintec Corporation) so that the anti-reflection film side was the display device side. Thereafter, the display device was turned on, the brightness was maximized, and all settings for changing the screen display color such as blue light cut function and color balance change were turned off, and the oblique hue when white was displayed was confirmed in a state where a white screen was displayed (a state where HTML color code #FFFFFF was displayed), and the evaluation was performed according to the following criteria. The results are shown in Tables 1 to 4. The oblique hue is a hue visually confirmed from an elevation angle of 50° and an azimuth angle of 0 to 360° at a distance of 30 cm from the sample. It can be said that the better the evaluation of the display characteristics, the less the variation in the optical characteristics of the sheet laminate cut out from the roll.
(Evaluation criteria)
A: When displayed in white in a dark room and the hue confirmed with the naked eye, no color unevenness was observed at all among 10 points.
B: When displayed as white in a dark room and the hue checked with the naked eye, slight color unevenness was felt among 10 points.
C: When displayed in white in a dark room and the hue checked with the naked eye, uneven color tone was felt among 10 points.
D: When displayed as white in a dark room and the hue confirmed with the naked eye, there is a strong sense of color unevenness among 10 points.
E: When displayed as white in a dark room and the hue confirmed with the naked eye, there is a very strong sense of color unevenness among 10 points.

1, 2: long laminate (laminate), 11: light absorbing anisotropic layer, 12: first substrate layer, 20: anti-reflection film, 21: polarizing layer, 22: first retardation layer, 23: second retardation layer.

Claims (11)

A rolled body obtained by winding a laminate including a base layer and an optically absorptive anisotropic layer formed on the base layer into a roll,
The optically absorptive anisotropic layer comprises
The liquid crystal display device is formed from a composition containing a dichroic dye and a liquid crystal compound,
having an absorption axis in a direction perpendicular to the surface of the optically absorptive anisotropic layer;
A wound body satisfying the following formula (I):
Ax _max (z = 50°) / Ax _min (z = 50°) ≦ 1.12 (I)
[In formula (I),
Ax _max (z = 50°) and Ax _min (z = 50°) are respectively the absorbance at the maximum absorption wavelength of the optically absorptive anisotropic layer in the wavelength range of 380 nm or more and 780 nm or less, and are the maximum and minimum values when the absorbance Ax (z = 50°) of linearly polarized light vibrating in the x-axis direction when the optically absorptive anisotropic layer is rotated 50° around the y-axis as the rotation axis, is measured at 10 measurement points set on the optically absorptive anisotropic layer contained in the laminate.
Here, the x-axis is an arbitrary direction in the plane of the optically absorptive anisotropic layer,
The y-axis is a direction perpendicular to the x-axis in the plane of the optically absorptive anisotropic layer. The roll according to claim 1 , wherein the optically absorptive anisotropic layer satisfies the following formula (II):
Ax _av < 0.050 (II)
[In the formula (II),
Ax _av is the absorbance of the optically absorptive anisotropic layer at the maximum absorption wavelength, and is the average value of the absorbance Ax of linearly polarized light vibrating in the x-axis direction measured at the measurement points. The rolled body according to claim 1, wherein the average thickness measured at the measurement points of the optically absorbing anisotropic layer is 0.7 μm or more and 1.5 μm or less. The wound body according to claim 1, wherein the thickness of the base layer is 30 μm or more and 150 μm or less. The roll according to claim 1 , wherein the optically absorptive anisotropic layer satisfies the following formula (i):
Ax _max (z = 50°) / Ax _min (z = 50°) ≦ 1.08 (i)
[In formula (i), Ax _max (z = 50°) and Ax _min (z = 50°) are as defined above.] The roll according to claim 1 , wherein the optically absorptive anisotropic layer satisfies the following formula (ii):
Ax _max (z=50°)/Ax _min (z=50°)<1.05 (ii)
[In formula (ii), Ax _max (z = 50°) and Ax _min (z = 50°) are as defined above.] The roll of claim 1, wherein the laminate further comprises an anti-reflection film. The roll according to claim 7, wherein the anti-reflection film is an elliptically polarizing plate. [a] A laminate cut out from the roll according to any one of claims 1 to 6, the laminate comprising the optically absorptive anisotropic layer, an antireflection film, and an image display element, or
[b] An organic EL display device comprising: the light absorption anisotropic layer and the antireflection film contained in the laminate cut out from the roll according to claim 7 or 8; and an image display element. A method for producing the wound body according to any one of claims 1 to 8,
A step (1) of unwinding and transporting the base material layer from a base material roll around which the base material layer is wound;
A step (2) of forming the optically absorptive anisotropic layer on the base layer to obtain the laminate;
and (3) winding the laminate into a roll. The step (2)
A step (2a) of coating a composition containing one or more dichroic dyes on the substrate layer to form a coating layer;
The method for producing a roll according to claim 10, further comprising the step (2b) of drying the coating layer.

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