CN117995060A - Wound body - Google Patents

Abstract

The present invention relates to a wound body. Provided is a wound body wherein variations in optical characteristics of individual sheets cut from an elongated laminate can be reduced. The roll is obtained by winding a laminate including a base material layer and a light absorbing anisotropic layer formed on the base material layer into a roll. The light absorbing anisotropic layer is formed of a composition containing a dichroic dye and a liquid crystalline compound, has an absorption axis in a direction perpendicular to the plane of the light absorbing anisotropic layer, and satisfies the relationship of the following formula (I). Ax _max (z=50°) and Ax _min (z=50°) are the maximum value and the minimum value when the absorbance Ax (z=50°) is measured for 10 measurement points set on the light absorption anisotropic layer included in the laminate, and Ax _max(z＝50°)/Ax_min (z=50°). Ltoreq.1.12 (I), respectively.

Description

Wound body

Technical Field

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

Background Art

In an organic EL (electroluminescent) display device, in order to reduce the hue difference between the front hue when viewed from the front and the oblique hue when viewed from an oblique direction when displaying white, it is known to use a laminated film having a vertically aligned liquid crystal cured film containing a dichroic pigment and a horizontally aligned phase difference film (for example, Patent Document 1). The vertically aligned liquid crystal cured film contained in the laminated film is formed by coating a polymerizable liquid crystal composition containing a dichroic pigment and a polymerizable liquid crystal compound on a substrate layer and polymerizing the polymerizable liquid crystal compound in the coating layer.

Prior art literature

Patent Literature

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

Summary of the invention

Problems to be solved by the invention

When manufacturing the above-mentioned laminated film, after obtaining the long-strip laminated film through the process of continuously forming a vertically aligned liquid crystal cured film on a long-strip substrate layer and laminating it on a long-strip horizontally aligned phase difference film, etc., it is sometimes cut into a desired size according to the product size, etc. The inventors of the present application have found that even a display device using a laminated film of a single piece cut from a single long-strip laminated film has deviations in display characteristics depending on each display device.

An object of the present invention is to provide a wound body capable of reducing the variation in optical properties of individual sheets cut out from a long laminated body.

Means for solving problems

The present invention provides the following wound body, organic EL display device, and method for producing the wound body.

[1] A rolled body obtained by rolling a laminate including a substrate layer and a light-absorbing anisotropic layer formed on the substrate layer into a roll shape,

The light absorption anisotropic layer is formed of a composition including a dichroic dye and a liquid crystal compound, has an absorption axis in a direction perpendicular to the surface of the light absorption anisotropic layer, and satisfies the relationship of 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 maximum value and the minimum value when the absorbance Ax (z=50°) is measured at 10 measurement points set on the aforementioned light absorption anisotropic layer included in the aforementioned stacked body, wherein the absorbance Ax (z=50°) is the absorbance of the absorption maximum wavelength within the wavelength range of 380 nm to 780 nm of the aforementioned light absorption anisotropic layer, and is the absorbance of linearly polarized light vibrating along the x-axis direction when the aforementioned light absorption anisotropic layer is rotated 50° with the y-axis as the rotation axis.

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

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

[2] The wound body according to [1], wherein the light absorption anisotropic layer satisfies the relationship of the following formula (II).

Ax _av <0.050(II)

[In formula (II),

_Axav is an average value of absorbance Ax measured at the measurement point, wherein the absorbance Ax is the absorbance of the absorption maximum wavelength of the light absorption anisotropic layer and is the absorbance of linearly polarized light vibrating in the x-axis direction.]

[3] The wound body according to [1] or [2], wherein the average value of the thickness of the light absorption 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 wound body according to any one of [1] to [4], wherein the light absorption 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 described above.]

[6] The wound body according to any one of [1] to [5], wherein the light absorption 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 described above.]

[7] The wound body according to any one of [1] to [6], wherein the laminate further comprises an antireflection film.

[8] The wound body according to [7], wherein the antireflection film is an elliptically polarizing plate.

[9] Organic EL display device,

[a] The organic EL display device comprises the light absorption anisotropic layer, the antireflection film, and the image display element contained in the laminated body cut out from the roll according to any one of [1] to [6], or

[b] The organic EL display device comprises the light absorption anisotropic layer and the antireflection film contained in the laminated body cut out from the rolled body according to [7] or [8], and an image display element.

[10] A method for producing a wound body, which is the method for producing a wound body according to any one of [1] to [8], comprising the following steps:

Step (1), unwinding the substrate layer from a substrate roll obtained by winding the substrate layer and conveying the substrate layer;

Step (2), forming the light absorption anisotropic layer on the substrate layer to obtain the laminate; and

In step (3), the laminate is wound into a roll.

[11] The method for producing a wound body according to [10], wherein the step (2) comprises the following steps:

Step (2a), coating a composition containing one or more dichroic dyes on the substrate layer to form a coating layer; and

In step (2b), the coating layer is dried.

Effects of the Invention

According to the present invention, it is possible to provide a wound body capable of reducing variations in optical characteristics of individual sheets cut out from a long-length laminated body.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional view schematically showing a stacked body constituting a wound body according to one embodiment of the present invention.

[ Fig. 2 ] is a cross-sectional view schematically showing a stacked body constituting a wound body according to another embodiment of the present invention.

Description of Reference Numerals

1, 2 long laminate (laminate), 11 light absorption anisotropic layer, 12 first base layer, 20 antireflection film, 21 polarizing layer, 22 first phase difference layer, 23 second phase difference layer.

DETAILED DESCRIPTION

Hereinafter, preferred embodiments of a roll, an organic EL display device, and a method for producing a roll will be described with reference to the accompanying drawings. In each of the drawings, the same reference numerals are given to the same components as those described above, and their description is omitted.

(Wound body)

The wound body of the present embodiment is a wound body obtained by winding a stacked body including a first substrate layer (substrate layer) and a light absorbing anisotropic layer formed on the first substrate layer into a roll. The winding diameter (diameter) of the wound body can be, for example, more than 50 mm and less than 1000 mm. The stacked body wound into a roll to form a wound body is a long strip-shaped stacked body (hereinafter, sometimes referred to as a "long strip stacked body"). The long strip stacked body can have a length of, for example, more than 5 m and less than 10000 m in the length direction of the winding direction of the wound body, or more than 5 m and less than 5000 m, or more than 100 m and less than 5000 m, or more than 500 m and less than 3000 m, or more than 1000 m and less than 3000 m. The length in the width direction of the winding axis direction of the wound body may be 300 mm to 5000 mm, 500 mm to 3000 mm, 500 mm to 2500 mm, or 500 mm to 2000 mm.

The long laminated body may include a first substrate layer and a light absorption anisotropic layer, or may include layers other than these. The light absorption anisotropic layer included in the long laminated body is formed by a composition including a dichroic pigment and a liquid crystal compound (hereinafter, sometimes referred to as the "first composition"), has an absorption axis in a direction perpendicular to the surface of the light absorption anisotropic layer, and satisfies the relationship of formula (I) described later. The long laminated body is described in detail below.

(Laminate (First Embodiment))

FIG1 is a cross-sectional view schematically showing a laminated body constituting a roll according to one embodiment of the present invention. As shown in FIG1 , a long laminated body 1 as a laminated body constituting the roll comprises a first substrate layer 12 and a light absorbing anisotropic layer 11. The light absorbing anisotropic layer 11 is formed by a first composition comprising a dichroic pigment and a liquid crystal compound. The long laminated body 1 may have a first orientation layer for controlling the orientation of the liquid crystal compound. The first substrate layer 12 and the light absorbing anisotropic layer 11 may be directly in contact with each other or may be stacked via the first orientation layer. When the long laminated body 1 has a first orientation layer, it is preferred that the first orientation layer is in direct contact with the first substrate layer 12 and the light absorbing anisotropic layer 11.

(Light Absorption Anisotropic Layer)

The light absorption 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 light absorption anisotropic layer 11. Thus, the light absorption anisotropic layer 11 can have the property of easily transmitting light from the front direction and easily absorbing light from the oblique direction.

The term "having an absorption axis in a direction perpendicular to the surface of the light absorption anisotropic layer 11" means that Ax(z=50°)/Ax is greater than 5. Ax(z=50°) is described below. Ax is the absorbance of the absorption maximum wavelength within the wavelength range of 380 nm to 780 nm of the light absorption anisotropic layer 11, and represents the absorbance of linearly polarized light vibrating in the x-axis direction.

The light absorption anisotropic layer 11 may contain one kind of dichroic dye or may contain two or more kinds of dichroic dyes.

The light absorption anisotropic layer 11 is preferably a liquid crystal film. In this specification, the so-called 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 a polymer of a liquid crystal compound. The polymer of a liquid crystal compound may or may not show liquid crystal properties. The liquid crystal film constituting the light absorption anisotropic layer 11 contains a dichroic pigment.

The liquid crystal compound contained in the first composition is not particularly limited as long as it is a compound having liquid crystal properties, and can be a low molecular weight liquid crystal compound or a high molecular weight liquid crystal compound. The liquid crystal compound can be a polymerizable liquid crystal compound having a polymerizable group. In the case where 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 phase, 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 pigment and the liquid crystal compound will be described later.

The light absorption anisotropic layer 11 included in the long laminated body 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 formula (I), formula (i), and formula (ii),

Ax _max (z=50°) and Ax _min (z=50°) are respectively the maximum and minimum values when the absorbance Ax (z=50°) is measured at 10 measurement points (hereinafter sometimes referred to as "measurement point _P10 ") set on the light absorption anisotropic layer 11 included in the long strip laminate 1. The absorbance Ax (z=50°) is the absorbance of the absorption maximum wavelength within the wavelength range of 380 nm to 780 nm of the light absorption anisotropic layer 11, and is the absorbance of linearly polarized light vibrating along the x-axis direction when the light absorption anisotropic layer 11 is rotated 50° with the y-axis as the rotation axis.

The x-axis is an arbitrary direction within the plane of the light absorption anisotropic layer 11.

The y-axis is a direction orthogonal to the x-axis in the plane of the light absorption anisotropic layer 11.]

It should be noted that the z-axis is a direction perpendicular to the x-axis and the y-axis, and is the thickness direction of the light absorption anisotropic layer 11 .

In this specification, the measuring points _P10 for measuring the absorbance Ax (z = 50°) in order to determine Ax _max (z = 50°) and Ax _min (z = 50°) are set at a total of 10 points along the length direction and the width direction of the light absorption anisotropic layer 11 of the long laminated body 1 unwound from the roll. The measuring points set along the width direction of the light absorption anisotropic layer 11 among the measuring points _P10 are: one point at the center position in the width direction of the light absorption anisotropic layer 11, and three points set at equal intervals between the center and the positions located 2.5 cm inside from the two ends from the center position toward the two ends in the width direction, that is, a total of seven points. The measurement points set along the long side direction of the light absorption anisotropic layer 11 among the measurement points _P10 are: one point from the above-mentioned center position set along the width direction of the light absorption anisotropic layer 11, and three points set at intervals of 30 cm along the length direction (winding direction) of the light absorption anisotropic layer 11 toward the winding axis side of the winding body.

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.

The closer the value of Ax _max (z = 50°)/Ax _min (z = 50°) in the above formula (I) and the above formula (i) is to 1, the smaller the deviation of the values of absorbance Ax (z = 50°) at the ₁₀ measurement points P10 of the light absorption anisotropic layer 11. Therefore, the absorbance Ax (z = 50°) in the plane of the light absorption anisotropic layer 11 that satisfies the relationship of the above formula (I) and the above formula (i) is uniformized, and it can be said that the dichroic dye is oriented in the same direction in the entire range of the light absorption anisotropic layer 11.

The light absorbing anisotropic layer 11 contained in the long laminated body 1 after unwinding from the winding body can be laminated with other layers such as the anti-reflection film described later as needed, cut into a single piece of the desired size according to the product size, etc. and applied to a display device, etc. By making the light absorbing anisotropic layer 11 contained in the long laminated body 1 satisfy formula (I), it is possible to suppress the deviation in the optical properties of the single piece. Thus, it is possible to suppress the individual differences in the optical properties of the single piece having the light absorbing anisotropic layer 11 cut out from the long laminated body 1, and therefore, when the single piece is applied to a display device, it is possible to suppress the deviation in the display properties for each display device.

The absorbance Ax (z = 50°) and Ax _max (z = 50°)/Ax _min (z = 50°) of the light absorption anisotropic layer 11 of the long laminate 1 can be adjusted by, for example, the thickness of the light absorption anisotropic layer 11, the conditions of the manufacturing process of the light absorption anisotropic layer 11 (described later), the type or content of the dichroic dye and/or liquid crystal compound contained in the light absorption anisotropic layer 11, etc. The absorbance Ax (z = 50°) and Ax _max (z = 50°)/Ax _min (z = 50°) at 10 measurement points _P10 of the light absorption anisotropic layer 11 can be determined by the method described in the Examples described later.

The light absorption anisotropic layer 11 included in the long laminated body 1 preferably satisfies the relationship of the following formula (II).

Ax _av <0.050(II)

[In formula (II),

_Axav is an average value of absorbance Ax measured at the measurement point _P10 . The absorbance Ax is the absorbance of the absorption maximum wavelength of the light absorption anisotropic layer 11 within the wavelength range of 380 nm to 780 nm, and is the absorbance of linearly polarized light vibrating in the x-axis direction.

The x-axis is as 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).

As for the absorbance Ax, the smaller its value is, the more accurately the absorption axis of the dichroic dye is oriented in the vertical direction relative to the surface of the light absorption anisotropic layer 11. Therefore, the absorbance Ax in the surface of the light absorption anisotropic layer 11 in which the absorbance Ax _av satisfies the relationship of the above formula (II) becomes smaller as a whole, and it can be said that the absorption axis of the dichroic dye is oriented in the vertical direction with good accuracy as a whole.

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 absorbance Ax and _Axav of the light absorption anisotropic layer 11 of the long laminate 1 can be adjusted by, for example, the thickness of the light absorption anisotropic layer 11, the conditions of the manufacturing process of the light absorption anisotropic layer 11 (described later), the type or content of the dichroic dye and the liquid crystal compound contained in the first composition for obtaining the light absorption anisotropic layer 11, etc. The absorbance Ax and _Axav at the 10 measurement points _P10 of the light absorption anisotropic layer 11 can be determined by the method described in the Examples described later.

The average value of the thickness of the light absorption anisotropic layer 11 measured at the measurement point _P10 is preferably 0.7 μm to 1.5 μm, may be 0.8 μm to 1.3 μm, or may be 0.9 μm to 1.1 μm.

The measurement point _P10 for determining the average value of the thickness of the light absorption anisotropic layer 11 is the same as the measurement point _P10 for determining the absorbance _Axmax (z=50°) and _Axmin (z=50°) in the above formula (I). The thickness of the light absorption anisotropic layer 11 at the measurement point _P10 can be measured by the method described in the examples described later.

(First base material layer)

The first substrate layer 12 can support the light absorption anisotropic layer 11. Examples of the first substrate layer 12 include a glass substrate and a film substrate, and a film substrate is preferred.

As the resin constituting the film substrate, for example, there can be mentioned: olefin resins such as polyethylene and polypropylene; cyclic olefin resins having a ring system or norbornene structure; polyvinyl alcohol; polyethylene terephthalate; poly(meth)acrylate; cellulose ester resins such as cellulose triacetate, cellulose diacetate and cellulose acetate propionate; polyethylene naphthalate; polycarbonate; polysulfone; polyethersulfone; polyetherketone; polyphenylene sulfide; polyphenylene ether, etc. Among them, from the viewpoint of transparency when used in optical film applications, a film substrate selected from any one of cellulose triacetate, cyclic olefin resins, polymethacrylate, and polyethylene terephthalate is more preferred. The so-called "(meth)acrylic-" refers to at least one of "acrylic-" and "methacrylic-". The same applies to the expression of (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 "Fujitack Film" (manufactured by Fuji Photo Film Co., Ltd.); "KC8UX2M", "KC8UY" and "KC4UY" (manufactured by Konica Minolta Opto Co., Ltd.).

As the cyclic olefin resin constituting the film substrate, commercially available cyclic olefin resins can also be used. As such cyclic olefin resins, "Topas" (registered trademark) (manufactured by Ticona (Germany)), "ARTON" (registered trademark) (manufactured by JSR Corporation), "ZEONOR" (registered trademark), "ZEONEX" (registered trademark) (manufactured by Zeon Corporation of Japan) and "Apel" (registered trademark) (manufactured by Mitsui Chemicals, Inc.) can be cited. These cyclic olefin resins can be made into film substrates by known means such as solvent casting method and melt extrusion method.

As the film substrate, a commercially available cyclic olefin resin substrate may also be used. Examples of such cyclic olefin resin substrates include "Escena" (registered trademark), "SCA40" (registered trademark) (all manufactured by Sekisui Chemical Co., Ltd.), "ZEONORFILM" (registered trademark) (manufactured by OPTES Co., Ltd.), and "ARTONFILM" (registered trademark) (manufactured by JSR Co., Ltd.).

As the first substrate layer 12, a film with a surface coating layer formed on one or both sides of a film substrate, a film with a protective film laminated on the surface of the film substrate on the side opposite to the light-absorbing anisotropic layer 11, or a film with a surface coating layer formed on one surface of a film substrate and a protective film laminated on the other surface can be used.

Examples of the surface coating layer constituting the film with a surface coating layer include: a layer formed by coating a hard coating agent, an easy-adhesion composition, a coupling agent, etc. on the surface of a film substrate; a layer formed by coating a reactive monomer or a reactive polymer, etc., and then irradiating them with active energy rays to graft polymerize them; etc. As the film with a surface coating layer, for example, a hard coating film having a hard coating layer as the surface coating layer is preferred. When the first substrate layer 12 is a hard coating film, it is preferred that the light absorption anisotropic layer 11 is laminated on the hard coating 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-curable resin. The curable composition containing an ultraviolet-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, an oligomer, or a polymer.

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

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

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

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

The hard coating layer preferably shows 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 Coatings - Part 5: Mechanical Properties of Coatings - Section 4: Scratch Hardness (Pencil Method)", and may also be 5B or harder.

A release agent or the like may be applied to the surface of the film substrate on the side where the surface coating layer such as a hard coating layer is to be formed, thereby performing a release treatment. The first substrate layer 12 may be incorporated together with the light absorption anisotropic layer 11 when the light absorption anisotropic layer 11 is incorporated into the display device, or may be peeled off and removed. By performing a release treatment on the surface of the film substrate as described above, when the light absorption anisotropic layer 11 is applied to the display device, the film substrate constituting the first substrate layer 12 can be peeled off and removed, and the surface coating layer and the light absorption anisotropic layer 11 can be incorporated.

The protective film constituting the film with a protective film is provided on the film substrate constituting the first substrate layer 12 in a removable manner. The protective film may have a multilayer structure formed by a resin film and an adhesive layer, or may be a self-adhesive film formed by a resin film of a single-layer structure. As the resin film used in the protective film having a multilayer structure, a film formed by the resin exemplified as the resin constituting the film substrate can be cited. As the self-adhesive film, a film using a polypropylene resin and a polyethylene resin can be cited. The protective film is usually removed after the light absorption anisotropic layer 11 is applied to a display device, etc.

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

The thickness of the first substrate layer 12 is preferably thin from the viewpoint of quality to the extent that it can be handled in a practical manner, but if it is too thin, the strength is reduced and there is a tendency for poor processability. From this viewpoint, the thickness of the first substrate layer 12 is preferably 30 μm to 150 μm, or 40 μm to 150 μm, or 50 μm to 140 μm, or 60 μm to 130 μm, or 70 μm to 120 μm.

As described above, when the light absorption 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 and removed. In this case, the light absorption anisotropic layer 11 is not incorporated into the display device together with the first substrate layer 12, but the first substrate layer 12 or the film substrate can be peeled off and removed after the light absorption anisotropic layer 11 is transferred to an adherend, so that the display device can be further thinned.

(Laminate (Second Embodiment))

FIG2 is a cross-sectional view schematically showing a stacked body constituting a winding body of another embodiment of the present invention. The long stacked body 2 (stacked body) shown in FIG2 includes the first substrate layer 12 and the light absorption anisotropic layer 11 possessed by the long stacked body 1 shown in FIG1 , and also includes an anti-reflection film 20. In the long stacked body 2 shown in FIG2 , the anti-reflection film 20 is stacked on the light absorption anisotropic layer 11 side of the long stacked body 1, but the anti-reflection film 20 may also be stacked on the first substrate layer 12 side of the long stacked body 1. The first substrate layer 12 and the light absorption anisotropic layer 11 are as described above. The anti-reflection film 20 is preferably an elliptically polarizing plate.

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

From the viewpoint of being able to compensate for the antireflection function in an oblique direction, the antireflection film 20 may further include a second retardation layer 23 (positive C plate) having anisotropy in the thickness direction.

When the phase difference layer constituting the first phase difference layer 22 and the second phase difference layer 23 are obtained from a composition containing a liquid crystal compound described later, these phase difference layers can each independently form a tilted orientation state (Japanese: "チルト orientation state") or a cholesteric orientation state (Japanese: "コレステリック orientation state").

When the anti-reflection film 20 includes the first phase difference layer 22 and the second phase difference layer 23, the anti-reflection film 20 in the long laminate 2 may have the polarizing layer 21, the first phase difference layer 22, and the second phase difference layer 23 in order from the light absorption anisotropic layer 11 side, or may have the polarizing layer 21, the second phase difference layer 23, and the first phase difference layer 22 in order. A laminating layer may be provided between the layers constituting the anti-reflection film 20. The laminating layer is a binder 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 formed by uniaxially oriented dichroic pigments as pigments with light absorption anisotropy. Examples of polarizers formed by uniaxially oriented dichroic pigments include: polarizers formed by uniaxially stretching a polymer such as a polyvinyl alcohol resin impregnated with iodine or an organic dichroic dye; polarizers formed by polymers of polymerizable liquid crystal compounds containing dichroic pigments, which are formed by using a composition containing a polymerizable liquid crystal compound and a dichroic pigment and orienting the dichroic pigment and the polymerizable liquid crystal compound. Such a polarizer can exhibit a polarizing function by utilizing the dichroic pigment encapsulated in a stretched film or a polymer of a polymerizable liquid crystal compound to anisotropically absorb light. The polarizing layer 21 can also be made into a polarizing plate obtained by laminating a protective film on one or both sides thereof and then assembled into the long strip laminate 2. The polarizing plate will be described in detail later.

The in-plane phase difference, i.e., R(λ), of the first phase difference layer 22 included in the anti-reflection film 20 for light of wavelength λ [nm] preferably satisfies the optical properties represented by the following formula (III), and preferably satisfies the optical properties represented by the following formula (III), the following formula (IV), and the following formula (V).

100nm<Re(550)<160nm(III)

Re(450)/Re(550)≤1.0(IV)

1.00≤Re(650)/Re(550)(V)

[In formulas (III) to (V),

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

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

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

If "Re(450)/Re(550)" in the above formula (IV) is greater than 1.0, the light leakage on the short wavelength side of the anti-reflection film 20 (elliptically polarizing plate) having a λ/4 phase difference layer increases. "Re(450)/Re(550)" is preferably 0.7 to 1.0, more preferably 0.80 to 0.95, further preferably 0.80 to 0.92, and particularly preferably 0.82 to 0.88. The value of "Re(450)/Re(550)" can be arbitrarily adjusted by adjusting the stacking angles and phase difference values of the plurality of phase difference layers constituting the first phase difference layer 22, and by adjusting the mixing ratio of the polymerizable liquid crystal compound when a polymerizable liquid crystal compound is used to obtain the phase difference layer constituting the first phase difference layer 22.

The in-plane phase difference value of the first phase difference layer 22 and the phase difference layer constituting the first phase difference layer 22 can be adjusted by the thickness of the first phase difference layer 22. The in-plane phase difference value is determined by the following formula (VI), so in order to make the in-plane phase difference value (Re(λ)) at the wavelength λ[nm] the desired value, it is sufficient to adjust Δn(λ) and the film thickness d. The thickness of the first phase difference layer 22 and the phase difference layer constituting the first phase difference layer 22 is preferably 0.5μm to 5μm, more preferably 1μm to 3μm, each independently. The thickness can be measured using an interference film thickness meter, a laser microscope or a stylus film thickness meter. It should be noted that when a polymerizable liquid crystal compound is used to obtain the phase difference layer constituting the first phase difference 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 wavelength λ[nm],

d represents the thickness of the phase difference layer,

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

The second phase difference layer 23 included in the anti-reflection film 20 is preferably a positive C plate. The phase difference value Rth(550) in the thickness direction of the positive C plate at a wavelength of 550nm is usually in the range of -170nm to -10nm, preferably in the range of -150nm to -20nm, and more preferably in the range of -100nm to -40nm. If the phase difference value in the thickness direction of the positive C plate is within this range, the property of preventing reflection from an oblique direction 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 can be assembled into the long laminated body 2 in a state of being stacked with a substrate layer (the third substrate layer described later) supporting them. In this case, the phase difference layer and the substrate layer constituting the first phase difference layer 22 can be directly in contact with each other, and the second phase difference layer 23 and the substrate layer can be directly in contact with each other.

Hereinafter, the details of each layer constituting the long laminated bodies 1 and 2 and the details of the components contained in the layer will be described.

(Dichroic Pigments)

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

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

Examples of the azo dye include compounds represented by formula (VII).

T ¹ -A ¹ (-N＝NA ² ) _p -N＝NA ³ -T ² (VII)

[In 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′-stilbene group which may have a substituent, or a divalent heterocyclic group which may have a substituent,

^T1 and ^T2 represent an electron withdrawing group or an electron releasing group, and are located at a position substantially 180° with respect to the azo bond plane.

p represents an integer of 0 to 4, and when p is 2 or greater, each A ² may be the same as or different from each other.

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

The content of the dichroic pigment in the light absorbing anisotropic layer is preferably 0.1 to 30 parts by mass, or 0.5 to 20 parts by mass, or 1 to 10 parts by mass, or 1 to 5 parts by mass. The content ratio of the dichroic pigment in the light absorbing anisotropic layer can be calculated as the ratio of the dichroic pigment to 100 parts by mass of the solid content of the first composition used to form the light absorbing anisotropic layer. It should be noted that in this specification, the solid content of the first composition refers to all components after removing volatile components such as organic solvents from the first composition.

The content of the dichroic pigment contained in the first composition (the total amount when multiple types are contained) is generally 1 to 60 parts by mass, preferably 1 to 40 parts by mass, and more preferably 1 to 20 parts by mass relative to 100 parts by mass of the liquid crystal compound from the viewpoint of obtaining good light absorption characteristics. When the content of the dichroic pigment is less than this range, light absorption becomes insufficient and sufficient light absorption anisotropy characteristics cannot be obtained. When the content of the dichroic pigment is more than this range, there is a situation where the orientation of the liquid crystal molecules of the liquid crystal compound is hindered.

(Liquid crystal compound and polymer thereof)

The liquid crystal compound contained in the first composition for forming the light absorption anisotropic layer is used to orient the dichroic pigment through the guest-host interaction. The liquid crystal compound can be a low molecular liquid crystal compound or a high molecular liquid crystal compound. The liquid crystal compound can also be a polymerizable liquid crystal compound. The liquid crystal compound is preferably a compound that forms a smectic liquid crystal phase.

The polymerizable liquid crystal compound is a compound having a polymerizable group and having liquid crystal properties. The polymerizable group refers to a group participating in the polymerization reaction, preferably a photopolymerizable group. Here, the so-called photopolymerizable group refers to a group that can participate in the polymerization reaction using active free radicals, acids, etc. generated by the photopolymerization initiator described later. As the polymerizable group, vinyl, vinyloxy, 1-chlorovinyl, isopropenyl, 4-vinylphenyl, acryloyloxy, methacryloxy, oxacyclopropyl, oxetane, etc. can be cited. Among them, acryloyloxy, methacryloxy, vinyloxy, oxacyclopropyl, and oxetane are preferred, and methacryloyloxy or acryloyloxy are more preferred. The liquid crystal can be a thermotropic liquid crystal or a lyotropic liquid crystal. When mixed with the above-mentioned dichroic pigment, it is preferably a thermotropic liquid crystal.

When the polymerizable liquid crystal compound is a thermotropic liquid crystal, it can be a thermotropic liquid crystal compound showing a nematic liquid crystal phase, or it can be a thermotropic liquid crystal compound showing a smectic liquid crystal phase. When the light absorption anisotropy is presented in the form of a liquid crystal cured film (liquid crystal film) by polymerization reaction, the liquid crystal state displayed by the polymerizable liquid crystal compound is preferably a smectic phase, and when it is a high-order smectic phase, it is more preferred from the viewpoint of high performance. Among them, it is more preferred to form a high-order smectic liquid crystal compound of smectic B phase, smectic D phase, smectic E phase, smectic F phase, smectic G phase, smectic H phase, smectic I phase, smectic J phase, smectic K phase, or smectic L phase, and it is further preferred to form a high-order smectic liquid crystal compound of smectic B phase, smectic F phase or smectic I phase. If the liquid crystal phase formed by the polymerizable liquid crystal compound is these high-order smectic phases, it is possible to manufacture a light absorption anisotropic layer with higher light absorption anisotropy. In the X-ray diffraction measurement, the light absorption anisotropic layer with high light absorption anisotropy can obtain Bragg peaks derived from high-order structures such as hexagonal phases and crystalline phases. The Bragg peaks are peaks derived from the periodic structure of molecular orientation. For the light absorption anisotropic layer, the periodic interval can be From the viewpoint of obtaining higher light absorption anisotropic characteristics, the light absorption anisotropic layer preferably contains a polymer of a polymerizable liquid crystal compound oriented in a smectic phase.

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

When the liquid crystal compound is the above-mentioned high molecular weight liquid crystal compound, a known liquid crystal polymer can be used as the liquid crystal polymer, and examples thereof include liquid crystal polymers described in Japanese Unexamined Patent Application Publication No. 2011-237513.

Liquid crystal compounds can be used alone or in combination of two or more. Relative to 100 parts by mass of the light absorption anisotropic layer, the content of the liquid crystal compound in the light absorption anisotropic layer is preferably 40 parts by mass or more and 99.9 parts by mass or less, or 60 parts by mass or more and 99 parts by mass or less, or 70 parts by mass or more and 99 parts by mass or less. If the content of the liquid crystal compound is within the above range, there is a tendency that the orientation of the liquid crystal compound when forming the light absorption anisotropic layer becomes higher. The proportion of the liquid crystal compound or its polymer in the light absorption anisotropic layer can be calculated in the form of the proportion of the liquid crystal compound relative to 100 parts by mass of the solid component of the first composition for forming the light absorption anisotropic layer.

(Method for forming light absorption anisotropic layer)

The light absorption anisotropic layer can be formed, for example, by coating the first composition containing a dichroic pigment and a liquid crystal compound on the first substrate layer. The coating layer formed by coating the first composition can be subjected to a drying treatment for removing a solvent or the like to form the light absorption 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 absorption anisotropic layer as a cured layer of the polymerizable liquid crystal compound. The first composition can be applied to the surface of the first substrate layer, or to the surface of the first orientation layer formed on the surface of the first substrate layer.

The content of the dichroic pigment in the first composition (in the case of including multiple, its total amount) can be appropriately determined according to the type of dichroic pigment, etc., from the viewpoint of obtaining good light absorption characteristics, for example, relative to 100 parts by mass of liquid crystal compounds, it can be more than 1 part by mass and less than 60 parts by mass, it can also be more than 1 part by mass and less than 40 parts by mass, it can also be more than 1 part by mass and less than 20 parts by mass. If the content of the dichroic pigment is less than the above-mentioned range, the light absorption capacity of the light absorption anisotropic layer becomes insufficient, and sometimes sufficient light absorption anisotropy cannot be obtained. If the content of the dichroic pigment is more than the above-mentioned range, the orientation of the liquid crystal compound is sometimes hindered.

The first composition may also include a solvent in addition to a dichroic pigment and a liquid crystal compound. Usually, the viscosity of the liquid crystal compound is high, so in many cases, it is dissolved in a solvent to make the first composition including a solvent, whereby coating to the first substrate layer becomes easy, and as a result, a light absorption anisotropic layer is easily formed. As a solvent, it is preferably a solvent that can completely dissolve the liquid crystal compound, and in addition, it is preferably an inactive solvent for the polymerization reaction of the liquid crystal compound. As the solvent, for example, alcohol solvents such as methanol, ethanol, ethylene glycol, isopropanol, propylene glycol, ethylene glycol methyl ether, ethylene glycol butyl ether, and propylene glycol monomethyl ether can be cited; ester solvents such as ethyl acetate, butyl acetate, ethylene glycol methyl ether acetate, γ-butyrolactone, propylene glycol methyl ether acetate, and ethyl lactate; ketone solvents such as acetone, methyl ethyl ketone, cyclopentanone, cyclohexanone, 2-heptanone, and methyl isobutyl ketone; aliphatic hydrocarbon solvents such as pentane, hexane, and heptane; aromatic hydrocarbon solvents such as toluene and xylene; nitrile solvents such as acetonitrile; ether solvents such as tetrahydrofuran and dimethoxyethane; chlorinated solvents such as chloroform and chlorobenzene; amide solvents such as dimethylacetamide, dimethylformamide, N-methyl-2-pyrrolidone, and 1,3-dimethyl-2-imidazolidinone, etc. These solvents can be used alone or in combination of two or more.

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 solid component in the first composition is preferably 2 to 50% by mass, and more preferably 5 to 30% by mass. If the content of the solid component is 50% by mass or less, the viscosity of the first composition becomes low, so it is easy to form a light absorption anisotropic layer with a substantially uniform thickness, and there is a tendency that it is not easy to produce unevenness in the light absorption anisotropic layer. The content of the solid component can be determined in consideration of the thickness of the light absorption anisotropic layer to be manufactured.

The first composition may further include a polymerization initiator such as a photopolymerization initiator or a thermal polymerization initiator, a leveling agent, an antioxidant, a photosensitizer, and other additives. When the first composition is directly coated on the surface of the first substrate layer (when the first orientation layer is not used), the first composition preferably further includes an orientation promoter.

The polymerization initiator can be used when the first composition contains a compound participating 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 initiating the polymerization reaction of the polymerizable liquid crystal compound, a photopolymerization initiator that generates active free radicals by the action of light is preferred from the viewpoint of not depending on the phase state of the thermotropic liquid crystal.

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

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

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

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

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

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

The content of the polymerization initiator in the first composition can be appropriately adjusted according to the type and amount of the polymerizable liquid crystal compound, and is generally 0.1 to 30 parts by mass, preferably 0.5 to 10 parts by mass, and more preferably 0.5 to 8 parts by mass relative to 100 parts by mass of the polymerizable liquid crystal compound. If the content of the polymerization initiator is within the above range, polymerization can be performed without disturbing the orientation of the polymerizable liquid crystal compound.

The so-called leveling agent is an additive that has the function of adjusting the fluidity of the composition and making the film obtained by coating the composition flatter. As the leveling agent, for example, organic modified silicone oil-based, polyacrylate-based, and perfluoroalkyl-based leveling agents can be cited. Among them, polyacrylate-based leveling agents and perfluoroalkyl-based leveling agents are preferred.

When the first composition contains a leveling agent, it is preferably 0.01 to 5 parts by mass, and more preferably 0.05 to 3 parts by mass, relative to 100 parts by mass of the content of the liquid crystal compound. If the content of the leveling agent is within the above range, it is easy to orient the liquid crystal compound, and the obtained light absorption anisotropic layer tends to become smoother. If the content of the leveling agent relative to the liquid crystal compound exceeds the above range, it is easy to produce unevenness in the obtained light absorption anisotropic layer. It should be noted that the first composition may contain two or more leveling agents.

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

Before applying the first composition to the surface of the first substrate layer or the surface of the first orientation layer formed on the surface of the first substrate layer, it is preferred to perform a static elimination treatment on the first substrate layer or the first substrate layer formed with the first orientation layer. The static elimination treatment can be performed using known static elimination devices such as static elimination ropes, static elimination brushes, and ion generators (static elimination rods). If the first substrate layer (including the case where the first orientation layer is formed) to which the first composition is applied is charged, uneven coating is likely to occur when the first composition is applied. By performing a static elimination treatment, it is easy to form a light absorption anisotropic layer that satisfies the relationship of the above formula (I).

Examples of a method for applying the first composition include known methods such as a coating method such as a spin coating method, an extrusion method, a gravure coating method, a die coating method, a bar coating method, and an applicator method, and a printing method such as a flexographic method.

It is preferred that the coating layer of the first composition formed on the first substrate layer is dried. When the first composition contains a solvent, the solvent in the coating layer can be removed by drying the coating layer. As a drying method, known methods can be cited, and one or more methods such as natural drying, heating drying, ventilation drying, and reduced pressure drying can be cited. The drying treatment of the coating layer can be carried out in one stage, or in two or more stages, for example, in three stages. In the case of heating and drying in more than two stages, the temperature can be the same in each stage, but it is preferably carried out in a manner that the drying temperature in the previous stage is a relatively low temperature and the drying temperature in the later stage is a relatively high temperature. In the case of ventilation drying in more than two stages, the air volume in the previous stage can be relatively small, and the air volume in the later stage can be relatively large. In the case of reduced pressure drying in more than two stages, the reduced pressure conditions in the previous stage can be relatively small, and the reduced pressure conditions in the later stage can be relatively large. By increasing the drying temperature, air volume, reduced pressure conditions, etc. in the subsequent drying process compared to the previous drying process, unevenness generated on the coating layer during the drying process can be suppressed, making it easier to form a light absorption anisotropic layer that satisfies the relationship of the above formula (I).

The drying conditions in the drying treatment can be appropriately determined according to the components contained in the first composition. For example, the drying temperature in the drying treatment is 50°C or more and 150°C or less, or 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 preferred to set the drying temperature in the temperature region where the polymerizable liquid crystal compound exhibits a smectic phase. It is more preferred to set the maximum temperature of the drying temperature to a temperature that is 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 treatment is 15 seconds or more and 10 minutes or less, or 0.5 minutes or more and 5 minutes or less.

When heat treatment is performed during the drying treatment, the liquid crystal compound contained in the first composition may be heated to a temperature above the liquid crystal phase transition temperature at which the liquid crystal compound undergoes phase transition, thereby orienting the liquid crystal compound while removing the solvent in the coating layer. Thus, the liquid crystal compound can be oriented in a direction perpendicular to the surface of the light absorption anisotropic layer, and the dichroic pigment can also be oriented along with the orientation of the liquid crystal compound.

Alternatively, when a first orientation layer is provided on the surface of the first substrate layer, the liquid crystal compound and the dichroic dye in the coating layer can be oriented by utilizing the orientation control force of the first orientation layer.

When the first composition does not contain a polymerizable liquid crystal compound, the light absorption anisotropic layer can be obtained by aligning the liquid crystal compound and the dichroic dye and then removing the solvent as described above.

When the first composition contains a polymerizable liquid crystal compound, the coating layer formed on the first substrate layer can be dried, and active energy rays can be irradiated while the polymerizable liquid crystal compound and the dichroic dye are oriented to polymerize and cure the polymerizable liquid crystal compound, thereby forming a light-absorbing anisotropic layer in which the liquid crystal compound and the dichroic dye are oriented.

As a method for polymerizing a polymerizable liquid crystal compound, photopolymerization is preferred. Photopolymerization can be implemented by irradiating a laminated structure of a coating layer obtained by coating a first composition containing a polymerizable liquid crystal compound on a first substrate layer or a first orientation layer with active energy rays. As the active energy rays irradiated, it can be appropriately selected according to the type of polymerizable liquid crystal compound contained in the coating layer (especially the type of photopolymerizable functional group possessed by the polymerizable liquid crystal compound), the type of photopolymerization initiator when a photopolymerization initiator is included, and their amount. Specifically, one or more lights selected from the group consisting of visible light, ultraviolet light, infrared light, X-rays, α rays, β rays, and γ rays can be cited. Among them, from the aspect of easily controlling the progress of the polymerization reaction and the aspect that a device widely used in the art can be used as a photopolymerization device, ultraviolet light is preferred, and the type of polymerizable liquid crystal compound is preferably selected in a manner that can be photopolymerized using ultraviolet light.

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

The ultraviolet irradiation intensity is usually 10mW/ ^cm2 to 3,000mW/ ^cm2 . The ultraviolet irradiation intensity is preferably an intensity in a wavelength region effective for activation of a cationic polymerization initiator or a radical polymerization initiator. The irradiation time is usually 0.1 seconds to 10 minutes, preferably 1 second to 5 minutes, more preferably 5 seconds to 3 minutes, and further preferably 10 seconds to 1 minute. When irradiation is performed once or more times with such an ultraviolet irradiation intensity, the cumulative light amount is 10mJ/ ^cm2 to 3,000mJ/ ^cm2 , preferably 50mJ/ ^cm2 to 2,000mJ/ ^cm2 , and more preferably 100mJ/ ^cm2 to 1,000mJ/ ^cm2 . When the cumulative light amount is below this range, there is a case where the curing of the polymerizable liquid crystal compound becomes insufficient and good transferability is not obtained when the light absorption anisotropic layer is transferred to an adherend. On the contrary, when the accumulated light amount is equal to or larger than this range, the light absorption anisotropic layer may be 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. For example, when irradiating the active energy ray, the roller (support roller) supporting the first substrate layer on which the coating layer is formed can be cooled. The temperature of the roller can be set to, for example, 5°C to 30°C or more, or 10°C to 25°C or less.

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

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

As the first orientation layer formed between the first substrate layer and the light absorption anisotropic layer, it is preferred that the first orientation layer is insoluble in the solvent used when forming the light absorption anisotropic layer on the first orientation layer and has heat resistance in the heating treatment for removing the solvent and orienting the liquid crystal. As the first orientation layer, there can be cited a polymer orientation layer formed of an oriented polymer, a photo-orientation layer and a groove orientation layer, a stretched film stretched along the orientation direction, etc. In the case of being applied to a long roll film, the photo-orientation layer is preferred from the aspect of being able to easily control the orientation direction.

The thickness of the first orientation 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.

As the oriented polymer used in the rubbing oriented layer, polyamides, gelatins, polyimides with amide bonds in the molecule and polyamic acids, polyvinyl alcohol, alkyl-modified polyvinyl alcohol, polyacrylamide, polyoxazole, polyethyleneimine, polystyrene, polyvinyl pyrrolidone, polyacrylic acid and polyacrylates, etc., which are hydrolyzates thereof, can be cited. Among them, polyvinyl alcohol is preferred. These oriented polymers can be used alone or in combination of two or more.

The rubbing method includes a method in which a film of an oriented polymer formed on the surface of the first substrate layer by applying the oriented polymer composition to the first substrate layer and annealing the oriented polymer composition is brought into contact with a rotating rubbing roller wound with a rubbing cloth.

The photo-alignment layer is formed of a polymer, oligomer or monomer having a photoreactive group. For the photo-alignment layer, the alignment control force can be obtained by irradiating the coating layer formed by coating the composition for forming the photo-alignment layer on the first substrate layer with polarized light. From the perspective that the direction of the alignment control force can be arbitrarily controlled by selecting the polarization direction of the irradiated polarized light, the photo-alignment layer is more preferred.

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

As photoreactive groups with C=C bonds, for example, vinyl, polyene, stilbene, stilbazolyl, stilbazolinium, chalcone and cinnamoyl groups can be cited. From the perspective of easy control of reactivity and the presentation of orientation control force during photo-orientation, chalcone and cinnamoyl groups are preferred. As photoreactive groups with C=N bonds, groups with structures such as aromatic Schiff bases and aromatic hydrazones can be cited. As photoreactive groups with N=N bonds, groups with azobenzene as the basic structure can be cited, such as azobenzene, azonaphthyl, aromatic heterocyclic azo, disazo and formazan. As photoreactive groups with C=O bonds, benzophenone, coumarin, anthraquinone and maleimide groups can be cited. These groups can have substituents such as alkyl, alkoxy, aryl, allyloxy, cyano, alkoxycarbonyl, hydroxyl, sulfonic acid and halogenated alkyl.

In order to irradiate polarized light, it can be a method of directly irradiating polarized light from the film surface of the coating layer of the composition for forming the photo-alignment layer, or it can be a method of irradiating polarized light from the first substrate layer side and allowing the polarized light to pass through for irradiation. In addition, the polarized light is particularly preferably substantially parallel light. The wavelength of the irradiated polarized light is the wavelength of the wavelength region in which the photoreactive group of the polymer or monomer having a photoreactive group can absorb light energy. Specifically, UV (ultraviolet light) in the range of 250 to 400nm is particularly preferred. As the light source used in the polarized light irradiation, xenon lamps, high-pressure mercury lamps, ultra-high-pressure mercury lamps, metal halide lamps, KrF, ArF and other ultraviolet lasers can be cited, and high-pressure mercury lamps, ultra-high-pressure mercury lamps and metal halide lamps are more preferred. The luminous intensity of ultraviolet light with a wavelength of 313nm of these lamps is large, so it is preferred. The light from the above-mentioned light source can be irradiated through an appropriate polarizer, thereby irradiating polarized light. As the polarizer, 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 the property of transmitting linear polarized light having a vibration plane orthogonal to the absorption axis when non-polarized light is incident. The polarizing layer can be: a stretched polarizing film obtained by adsorbing a pigment having absorption anisotropy on a polymer such as a polyvinyl alcohol resin (hereinafter, a stretched polarizing film using a polyvinyl alcohol resin as a polymer is sometimes referred to as a "PVA polarizing film"); a liquid crystal polarizing film comprising a polarizing layer of a liquid crystal film formed by applying a second composition containing a pigment having absorption anisotropy and a compound having liquid crystal properties to a substrate film. As a pigment having absorption anisotropy, a dichroic pigment can be cited. The dichroic pigment contained in the PVA polarizing film is preferably iodine.

The PVA polarizing film can be obtained through the following steps: a step of uniaxially stretching a polyvinyl alcohol resin film (hereinafter sometimes referred to as a "PVA film"); a step of dyeing the PVA film with a dichroic pigment to adsorb the dichroic pigment; a step of treating the PVA film adsorbed with the dichroic pigment with an aqueous boric acid solution; and a step of washing with water after the treatment with an aqueous boric acid solution as needed; and the like.

The thickness of the polarizing layer of the PVA polarizing film is usually 30 μm or less, preferably 18 μm or less, more preferably 15 μm or less, and further 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 film can be performed before, at the same time as, or after dyeing based on a dichroic pigment. In the case of uniaxial stretching after dyeing, the uniaxial stretching can be performed before or during the boric acid treatment. Of course, uniaxial stretching can also be performed in multiple stages as shown here. In uniaxial stretching, a method of uniaxial stretching along the film conveying direction between rollers with different circumferential speeds, a method of uniaxial stretching along the film conveying direction using a hot roller, a method of stretching along the width direction using a tenter, etc. can be adopted. Uniaxial stretching can be implemented by dry stretching in the atmosphere, or by wet stretching in a state where the PVA film is swollen using a solvent such as water. The stretching ratio is usually about 3 to 8 times. In addition, a drying treatment can be performed after applying an aqueous solution containing polyvinyl alcohol on the thermoplastic resin film, and the film can be stretched together with the thermoplastic resin film by the above method.

The PVA film can be dyed with a dichroic dye by, for example, immersing the PVA film in an aqueous solution containing the dichroic dye. Specifically, iodine and a dichroic organic dye can be used as the dichroic dye.

The liquid crystal polarizing film formed by the second composition containing a pigment having absorption anisotropy and a compound having liquid crystal properties can be suitably used, for example, in flexible display applications, from the perspectives of being able to arbitrarily control the hue, being able to significantly reduce the thickness, and being non-shrinkable due to the absence of thermal stretch relaxation.

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

The thickness of the polarizing layer included in the liquid crystal polarizing film is 0.1 μm to 5 μm, more preferably 0.3 μm to 4 μm, and further preferably 0.5 μm to 3 μm. If the thickness is smaller than this range, sometimes the necessary light absorption cannot be obtained, and if the thickness is larger than this range, there is a tendency that the orientation control force generated by the second orientation layer (described later) is reduced and orientation defects are easily generated.

For the polarizing layer (liquid crystal film) included in the liquid crystal polarizing film, the ratio of the absorbance A1 (λ) in the orientation direction for light of wavelength λ [nm] to the absorbance A2 (λ) in the direction perpendicular to the plane relative to the orientation direction (dichroic ratio; A1/A2) is preferably 7 or more, more preferably 20 or more, and further preferably 40 or more. The larger the value of the dichroic ratio, the more excellent the absorption selectivity of the polarizing layer. Although it also depends on the type of dichroic dye, when the liquid crystal film (liquid crystal cured film) included in the liquid crystal polarizing film is cured in the state of a nematic liquid crystal phase, the above-mentioned dichroic ratio is about 5 to 10.

By mixing two or more dichroic pigments with different absorption wavelengths, polarizing layers of various hues can be produced, and polarizing layers with absorption in the entire visible light range can be produced. By producing a polarizing layer with such absorption characteristics, it can be expanded to various uses.

As the second substrate layer, the substrate layer described in the first substrate layer can be cited. The second substrate layer can be peeled off and removed when making an anti-reflection film, or it can be used as a protective film for the polarizing layer without peeling off and removing. As the dichroic pigment used in the liquid crystal polarizing film, the dichroic pigment used in the light absorption anisotropic layer can be cited. As the compound with liquid crystal properties, rod-shaped liquid crystal compounds, disc-shaped liquid crystal compounds, and mixtures thereof can be used. As the compound with liquid crystal properties, preferably polymerizable liquid crystal compounds. The liquid crystal compounds used in the light absorption anisotropic layer can also be used for the compound with liquid crystal properties and the polymerizable liquid crystal compound.

The liquid crystal polarizing film may include a second orientation layer. The second orientation layer is preferably a horizontal orientation layer that can orient a compound having liquid crystal properties in a horizontal direction relative to the surface of the liquid crystal polarizing film. The second orientation layer may include a polymer orientation layer formed by an orientation polymer, a light orientation layer formed by a light orientation polymer, and a groove orientation layer having a concave-convex pattern and a plurality of grooves (grooves) on the surface of the layer. From the viewpoint of the accuracy and quality of the orientation angle, the second orientation layer is preferably a light orientation layer. As the above-mentioned orientation layers constituting the second orientation layer, the orientation layer described in the first orientation layer may be mentioned.

(Polarizing Plate)

Polarizing plate is a linear polarizing plate having a protective film on one or both sides of the polarizing layer. The protective film can use a thermoplastic resin film. The thermoplastic resin film can be surface treated (e.g., corona treated, etc.) to improve the adhesion with the polarizing layer, or a thin layer such as a primer layer (also referred to as a primer layer) can be formed. The polarizing layer and the protective film can be directly connected or laminated via a laminating layer (adhesive layer or adhesive layer).

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

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

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

(1st phase difference layer, 2nd phase difference layer)

The first retardation layer and the second retardation layer (hereinafter, they may be collectively referred to as "retardation layer") may be a stretched film or a liquid crystal film including a liquid crystal film, and preferably a liquid crystal film.

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

When the retardation layer is a stretched film, the thickness of the retardation layer is usually 5 μm to 200 μm, preferably 10 μm to 80 μm, and more preferably 40 μm to 40 μm.

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.

As the third substrate layer, the substrate layer described in the first substrate layer can be cited. The third substrate layer can be peeled off and removed when the anti-reflection film is made, or it can be used as a protective film for the phase difference layer without peeling off and removing. As a liquid crystal compound, a liquid crystal compound having a polymerizable group, especially a photopolymerizable group, i.e., a polymerizable liquid crystal compound can be used. As a polymerizable liquid crystal compound, for example, a polymerizable liquid crystal compound previously known in the field of phase difference film can be used. The so-called photopolymerizable group refers to a group that can participate in the polymerization reaction using reactive species such as active free radicals, acids, etc. generated by a photopolymerization initiator. As a photopolymerizable group, vinyl, vinyloxy, 1-chlorovinyl, isopropenyl, 4-vinylphenyl, acryloyloxy, methacryloyloxy, oxypropyl, oxetane, etc. can be cited. Among them, acryloyloxy, methacryloyloxy, vinyloxy, oxypropyl and oxetane are preferred, and acryloyloxy is more preferred. Regarding liquid crystal properties, it can be thermotropic liquid crystal or lyotropic liquid crystal, but from the perspective of being able to perform precise film thickness control, thermotropic liquid crystal is preferred. In addition, as a phase-ordered structure in thermotropic liquid crystal, it can be nematic liquid crystal or smectic liquid crystal. In addition, it can be rod-shaped liquid crystal or disc-shaped liquid crystal. The polymerizable liquid crystal compound can be used alone or in combination of two or more.

In the case where the λ/4 phase difference layer included in the first phase difference layer is a liquid crystal film comprising 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-type or H-type mesomorphic structure and further having birefringence in a direction perpendicular to the major axis direction of the molecule from the viewpoint of exhibiting reverse wavelength dispersion. From the viewpoint of obtaining stronger dispersion, a T-type liquid crystal is more preferred. Specifically, the structure of the T-type liquid crystal includes, for example, a compound represented by the following formula (VIII).

[Chemical formula 1]

[In formula (VIII),

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

^G1 and ^G2 each independently represent a divalent aromatic group or a divalent alicyclic hydrocarbon group. Here, the hydrogen atoms contained in the divalent aromatic group or the divalent alicyclic hydrocarbon group may be substituted by a halogen atom, an alkyl group having 1 to 4 carbon atoms, a fluoroalkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a cyano group or a nitro group, and the carbon atoms constituting the divalent aromatic group or the divalent alicyclic hydrocarbon group may be substituted by an oxygen atom, a sulfur atom or a nitrogen atom.

L ¹ , L ² , B ¹ and B ² are each independently a single bond or a divalent linking group.

k and l each independently represent an integer of 0 to 3, and satisfy the relationship of 1≤k+1. Here, when 2≤k+1, ^B1 and ^B2 , ^G1 and ^G2 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, wherein the hydrogen atoms contained in the alkanediyl group may be substituted with halogen atoms, and _-CH2- contained in the alkanediyl group may be substituted with -O-, -S-, or -COO-. When there are a plurality of -O-, -S-, or -COO-, they are not adjacent to each other.

^P1 and ^P2 each independently represent a polymerizable group or a hydrogen atom, and at least one of them is a polymerizable group.]

^G1 and ^G2 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.

In addition, it is preferred that at least one of ^G1 and ^G2 present in plurality is a divalent alicyclic hydrocarbon group, and it is more preferred that at least one of ^G1 and ^G2 bonded to ^L1 or ^L2 is a divalent alicyclic hydrocarbon group.

^L1 and ^L2 are each independently preferably a ^single bond, ^an alkylene group having 1 to 4 carbon atoms, -O-, -S-, -Ra1ORa2-, -Ra3COORa4-, ^-Ra5OCORa6- , ^Ra7OC = ^OORa8- , -N=N-, ^-CRc = ^CRd- , or ^C≡C- . Here, ^Ra1 to ^Ra8 are each independently a single bond, or an alkylene ^group having ¹ to 4 carbon atoms, and ^Rc and ^Rd are alkyl groups having 1 to 4 carbon atoms or a hydrogen atom. ^L1 and ^L2 are each independently more preferably a single bond, ^-ORa2-1- , _-CH2- , _-CH2CH2- , _-COORa4-1- ^, or ^OCORa6-1- . Here, ^Ra2-1 , ^Ra4-1 , and ^Ra6-1 each independently represent a single bond, _{-CH2- ,} or _-CH2CH2- . ^L1 and ^L2 each independently represent more preferably a single bond, -O-, _-CH2CH2- , -COO-, _{-COOCH2CH2- ,} or _OCO- .

^B1 and ^B2 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 each independently represent a single bond or an alkylene group having 1 to 4 carbon atoms. ^B1 and ^B2 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 -. ^B1 and ^B2 are each independently preferably a single bond, -O-, -CH ₂ CH ₂ -, -COO-, -COOCH ₂ CH ₂ -, -OCO-, or OCOCH ₂ CH ₂ -.

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

^E1 and ^E2 are each independently preferably 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 epoxy, vinyl, vinyloxy, 1-chlorovinyl, isopropenyl, 4-vinylphenyl, acryloyloxy, methacryloyloxy, oxirane, and oxetanyl. Among them, acryloyloxy, methacryloyloxy, vinyloxy, oxirane, and oxetanyl are preferred, and acryloyloxy is more preferred.

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

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, further preferably 14 or more, and particularly preferably 16 or more. It is preferably 30 or less, more preferably 26 or less, and further preferably 24 or less.

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

[Chemical formula 2]

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

The symbol * indicates a 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.

^Q1 and ^Q2 each independently represent ^-CR2'R3'- , ^-S- , -NH-, ^-NR2'- , -CO- or O-, and ^R2 ' and R3 ^' 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.

^W1 and ^W2 each independently represent a hydrogen atom, a cyano group, a methyl group or a halogen atom.

m represents an integer from 0 to 6.]

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

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

^Z0 , ^Z1 and ^Z2 are each independently preferably a hydrogen atom, a halogen atom, an alkyl group having 1 to 12 carbon atoms, a cyano group, a nitro group, or an alkoxy group having 1 to 12 carbon atoms. ^Z0 is more preferably a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, or a cyano group. ^Z1 and ^Z2 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 them, -S-, -O-, and -NH- are particularly preferred.

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

In the compounds represented by formula (Ar-16) to (Ar-23), ^Y1 can form an aromatic heterocyclic group together with the nitrogen atom to which it is bonded and ^Z0 . As the aromatic heterocyclic group, the examples described above as the aromatic heterocyclic ring that Ar can have can be cited, for example, a pyrrole ring, an imidazole ring, a pyrroline ring, a pyridine ring, a pyrazine ring, a pyrimidine ring, an indole ring, a quinoline ring, an isoquinoline ring, a purine ring, a pyrrolidine ring, etc. can be cited. The aromatic heterocyclic group may have a substituent. In addition, ^Y1 can also form the aforementioned substituted polycyclic aromatic hydrocarbon group or polycyclic aromatic heterocyclic group together with the nitrogen atom to which it is bonded and ^Z0 . For example, a benzofuran ring, a benzothiazole ring, a benzoxazole ring, etc. can be cited.

Among the polymerizable liquid crystal compounds, compounds with a maximum absorption wavelength of 300 to 400 nm are preferred. When a photopolymerization initiator is contained in the third composition containing the polymerizable liquid crystal compound, there is concern about the polymerization reaction and gelation of the polymerizable liquid crystal compound during long-term storage. However, when the maximum absorption wavelength of the polymerizable liquid crystal compound is 300 to 400 nm, even if it is exposed to ultraviolet light during storage, 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 from the perspective of the long-term stability of the third composition, and the orientation and uniformity of the film thickness of the liquid crystal cured film contained in the first phase difference layer can be improved. It should be noted that the maximum absorption wavelength of the polymerizable liquid crystal compound can be measured in a solvent using an ultraviolet visible spectrophotometer. The solvent is a solvent that can dissolve the polymerizable liquid crystal compound, and chloroform and the like can be cited as examples.

Relative to 100 parts by mass of the solid content of the third composition, 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 further preferably 90 to 95 parts by mass. When the content of the polymerizable liquid crystal compound is within the above range, it is advantageous from the perspective of the orientation of the obtained liquid crystal cured film. It should be noted that in this specification, the so-called solid content of the third composition refers to all components after removing volatile components such as organic solvents from the third composition.

The phase difference layer (the phase difference layer constituting the first phase difference layer or the second phase difference layer) of the liquid crystal film may include a third orientation layer. The third orientation layer can be selected according to the direction in which the liquid crystal compound is oriented, and can be a vertical orientation layer or a horizontal orientation layer. When the third orientation layer is a material that is used as an orientation control force to make it present a horizontal orientation, the liquid crystal compound can form a horizontal orientation or a mixed orientation, and when it is a material that is vertically oriented, the liquid crystal compound can form a vertical orientation or an inclined orientation. Expressions such as horizontal and vertical indicate the direction of the long axis of the oriented liquid crystal compound when the plane of the first phase difference layer or the second phase difference layer is used as a reference. For example, the so-called vertical orientation refers to the long axis of the oriented liquid crystal compound in a direction perpendicular to the plane of the first phase difference layer or the second phase difference layer. The so-called vertical here refers to 90°±20° relative to the plane of the first phase difference layer or the second phase difference layer. As the third orientation layer, the orientation layer described in the first orientation layer and the second orientation layer can be cited.

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

(Lamination layer)

The laminating layer is an adhesive layer or a pressure-sensitive adhesive layer.

When the laminating 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 is a substance that exhibits adhesiveness by attaching itself to an adherend, and is called a so-called pressure-sensitive adhesive. In addition, the adhesive layer formed using the active energy ray-curable adhesive composition described later can adjust the degree of crosslinking and the adhesive force by irradiating active energy rays.

As the adhesive composition, there can be used any adhesive having excellent optical transparency known in the past without particular limitation, for example, an adhesive composition containing a base polymer such as an acrylic polymer, a urethane polymer, a silicone polymer, a polyvinyl ether, etc. can be used. In addition, the adhesive composition can be an active energy ray-curable adhesive composition or a thermosetting adhesive composition, etc. Among them, an adhesive composition using an acrylic resin having excellent transparency, adhesion, re-peelability (re-operability), weather resistance, heat resistance, etc. as a base polymer is preferred.

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

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

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

When the laminating layer is an adhesive layer, the adhesive layer can be formed using an adhesive composition. The adhesive composition used to form the adhesive layer is an adhesive other than a pressure-sensitive adhesive (adhesive), for example, a water-based adhesive, an active energy ray-curable adhesive.

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

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

When the bonding 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.

(Method for producing wound body)

The above-mentioned method for manufacturing the wound body preferably includes the following steps:

Step (1), unwinding the first substrate layer 12 from a first substrate roll obtained by winding the first substrate layer 12 and conveying it;

Step (2), forming the light absorption anisotropic layer 11 on the first substrate layer 12 to obtain the long laminated bodies 1 and 2; and

In step (3), the long laminated bodies 1 and 2 are wound into a roll.

The above-mentioned method for producing the wound body is a so-called roll-to-roll production method in which the light absorption anisotropic layer 11 is continuously formed while the long-length first base layer 12 is conveyed.

The step (2) of the above-mentioned method for producing a wound body preferably includes the following steps:

Step (2a), coating a first composition (composition) containing one or more dichroic dyes on the first substrate layer 12 to form a coating layer; and

In step (2b), the coated layer is dried.

When the first composition contains a polymerizable liquid crystal compound, the step (2) preferably includes a step (2c) of irradiating the dried coating layer with active energy rays after the step (2b). The step (2c) can polymerize and cure the polymerizable liquid crystal compound in the coating layer.

Steps (2a) to (2c) may adopt the method described in the above method for forming the light absorption anisotropic layer 11. By adjusting the production conditions of steps (2a) to (2c), a rolled body having the light absorption anisotropic layer 11 satisfying the relationship of the above formula (I) can be easily obtained.

The rolled body of the long laminated body 2 can be obtained, for example, by manufacturing the long laminated body 1, laminating the antireflection film 20 on the long laminated body 1 to obtain the long laminated body 2, and rolling the long laminated body.

(Organic EL display device)

The organic EL display device may include a light absorption anisotropic layer, an anti-reflection film, and an image display element contained in a laminated body cut out from the above-mentioned long strip laminated body 1 of the winding body. The anti-reflection film may use the anti-reflection film described above. The light absorption anisotropic layer and the anti-reflection film may be laminated in the form of a long strip, or may be laminated after they are cut out.

The organic EL display device may include a light absorption anisotropic layer and an antireflection film included in a laminated body cut out from the long laminated body 2 of the above-mentioned wound body, and an image display element.

The first substrate layer included in the long laminate can be incorporated into a display device together with the light absorption anisotropic layer, or can be peeled off and removed. The light absorption anisotropic layer and the antireflection film are formed into a single piece having a size corresponding to the size of the display device and then laminated on the image display element.

In an organic EL display device, a light absorption anisotropic layer, an antireflection film, and an image display element may be arranged in this order from the viewing side.

Example

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

[Production of anti-reflection film]

Hereinafter, the steps of producing the polarizing plate, the first retardation layer, and the second retardation layer constituting the antireflection film will be described.

(Production of polarizing plate)

After immersing a polyvinyl alcohol resin film having an average degree of polymerization of about 2,400 and a saponification degree of 99.9 mol % or more and a thickness of 75 μm in pure water at a temperature of 30°C, the film is 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 process). The polyvinyl alcohol resin film that has undergone the iodine dyeing process is 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 process). The polyvinyl alcohol resin film that has undergone the boric acid treatment process is 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 after stretching is 27 μm) formed by adsorption and orientation of iodine on the polyvinyl alcohol resin film. At this time, stretching is performed in the iodine dyeing process and the boric acid treatment process. The total stretching ratio in this stretching is 5.3 times.

The polarizing layer obtained above and the saponified triacetyl cellulose film (KC4UYTAC manufactured by KONICAMINOLTA, with a thickness of 40 μm) are bonded together via a water-based adhesive using a clamping roller. The resulting bond is dried at 60°C for 2 minutes while maintaining the tension of 430 N/m to prepare a polarizing plate having a triacetyl cellulose film as a protective film on one side. The water-based adhesive is prepared by adding 3 parts of carboxyl-modified polyvinyl alcohol (KURARAY POVAL KL318) and 1.5 parts of a water-soluble polyamide epoxy resin (Sumika Chemtex "Sumirezresin 650", an aqueous solution with a solid content concentration of 30%) to 100 parts of water.

(Production of the First Phase Difference Layer)

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

[Chemical formula 3]

A polymerizable liquid crystal compound (X1) and a polymerizable liquid crystal compound (X2) having the structures shown below were prepared respectively. The polymerizable liquid crystal compound (X1) was prepared according to the method described in Japanese Patent Publication No. 2010-31223. The polymerizable liquid crystal compound (X2) was prepared according to the method described in Japanese Patent Publication No. 2009-173893.

Polymerizable liquid crystal compound (X1):

[Chemical formula 4]

Polymerizable liquid crystal compound (X2):

[Chemical formula 5]

1 mg of the polymerizable liquid crystal compound (X1) was dissolved in 50 mL of tetrahydrofuran to obtain a solution. The obtained solution was placed in a measuring cuvette with an optical path length of 1 cm as a measuring sample, and the measuring sample was placed in an ultraviolet-visible spectrophotometer ("UV-2450" manufactured by Shimadzu Corporation), and the absorption spectrum was measured. The wavelength of the maximum absorbance was read from the obtained absorption spectrum. As a result, the maximum absorption wavelength λmax in the range of 300 to 400 nm was 350 nm.

A polymerizable liquid crystal compound (X1) and a polymerizable liquid crystal compound (X2) are mixed in a mass ratio of 90:10 to obtain a mixture. 0.1 parts of a leveling agent "BYK-361N" (manufactured by BM Chemie) and 6 parts of 2-dimethylamino-2-benzyl-1-(4-morpholinophenyl)butane-1-one ("Irgacure (registered trademark) 369 (Irg369)" manufactured by BASF Japan Ltd.) as a photopolymerization initiator are added to 100 parts of the obtained mixture. Furthermore, N-methyl-2-pyrrolidone (NMP) is added in such a manner that the solid content concentration becomes 13%. The mixture is stirred at a temperature of 80°C for 1 hour to prepare a composition for forming a first liquid crystal layer.

After corona treatment on a COP film ("ZF-14-50" manufactured by Zeon Co., Ltd. of Japan), the horizontal alignment layer forming composition prepared above was applied using a rod coater, dried at 80°C for 1 minute, and exposed to polarized UV light using a polarized UV light irradiation device ("SPOT CURE SP-9" manufactured by USHIO INC.) at a cumulative light amount of 100 mJ/ ^cm2 at a wavelength of 313 nm to form a horizontal alignment layer.

Next, the first liquid crystal layer-forming composition prepared above was applied on the horizontal alignment layer using a bar coater, and after heating at 120°C for 60 seconds, ultraviolet rays were irradiated from the surface coated with the above composition using a high-pressure mercury lamp ("Unicure VB-15201BY-A" manufactured by USHIO INC.) (cumulative light intensity at a wavelength of 365 nm under a nitrogen atmosphere: 500 mJ/ ^cm2 ), thereby forming a cured layer of the polymerizable liquid crystal compound, thereby producing a first phase difference layer having a layer structure of a horizontal alignment layer and a cured layer.

After confirming that there was no retardation in the COP film, Re(450) and Re(550) were measured using KOBRA-WPR manufactured by Oji Scientific Instruments Co., Ltd., and the relationship of the following formulas (III) to (V) was satisfied.

100nm<Re(550)<160nm(III)

Re(450)/Re(550)≤1.0(IV)

1.00≤Re(650)/Re(550)(V)

[In formulas (III) to (V),

Re(λ) represents the in-plane retardation value of the first retardation layer at wavelength λ[nm].

(Production of the Second Phase Difference 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).

To 100 parts of the polymerizable liquid crystal compound LC242 (Paliocolor LC242 (registered trademark of BASF) having the structure shown below, 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 in such a way that the solid content concentration became 13%, and they were mixed to obtain a composition for forming a second liquid crystal layer.

[Chemical formula 6]

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

Next, the second liquid crystal layer-forming composition prepared above was applied on the vertical alignment layer, dried at 80°C for 1 minute, and then irradiated with ultraviolet light at a wavelength of 365 nm under a nitrogen atmosphere at a cumulative light intensity of 500 mJ/ ^cm2 using a high-pressure mercury lamp ("Unicure VB-15201BY-A" manufactured by USHIO INC.), thereby forming a cured layer of a polymerizable liquid crystal compound, and preparing a second phase difference layer having a layer structure of a vertical alignment layer and a cured layer. The second phase difference layer is a positive C plate.

(Production of anti-reflection film)

After the first phase difference layer on the COP film is subjected to corona treatment, the first phase difference layer is laminated to the polarizing plate in such a way that the polarizing layer side of the polarizing plate prepared above becomes the first phase difference layer side via an adhesive (LINTEC, pressure-sensitive adhesive, thickness of 25 μm), to obtain a laminate. In the laminate, the angle between the absorption axis of the polarizing layer and the slow axis of the first phase difference layer is 45 °. Next, the COP film side of the laminate having the first phase difference layer formed thereon and the second phase difference layer on the COP film are subjected to corona treatment, and then laminated via an adhesive (LINTEC, pressure-sensitive adhesive, thickness of 25 μm) to form an anti-reflection film as an elliptically polarizing plate.

[Comparative Example 1]

(Preparation of the 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 at 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)butane-1-one ("Irgacure (registered trademark) 369 (Irg369)" manufactured by BASF Japan Ltd.) as a photopolymerization initiator were added. Furthermore, o-xylene was added in such a manner that the solid content concentration became 14%. After stirring the 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).

[Chemical formula 7]

As the dichroic dyes A and B, the compounds described below were used.

Dichroic dye A: Dichroic dye described in paragraph [0231] of Japanese Patent Application Laid-Open No. 2020-76920

[Chemical formula 8]

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

[Chemical formula 9]

[Determination of phase transition temperature]

The polymerizable liquid crystal compound (Y1) and the polymerizable liquid crystal compound (Y2) were mixed at a mass ratio of 75:25 to obtain a mixture of polymerizable liquid crystal compounds. The mixture applied to the orientation layer formed on the glass substrate was heated while the texture was observed using a polarizing microscope (BX-51, manufactured by Olympus Corporation) to confirm the phase transition temperature. After heating to 120°C, the temperature was lowered and observed, and it was confirmed that the phase transition was to the nematic phase at 103°C, the phase transition was to the smectic A phase at 95°C, and the phase transition was to the smectic B phase at 77°C.

(Preparation of the first substrate layer (1))

The following components were mixed and stirred at a temperature of 80° C. for 1 hour to prepare a curable composition.

Dipentaerythritol hexaacrylate: 50 parts

Urethane acrylate ("EBECRYL4858" manufactured by DAICEL allnex Ltd.): 50 parts

· 2-[4-(Methylthio)benzoyl]-2-(4-morpholinyl)propane ("Irgacure 907" manufactured by BASF, radical polymerization initiator): 3 parts

Methyl ethyl ketone (solvent): 10 parts

A roll body obtained by winding a demoulding polyethylene terephthalate (PET) film ("SP-PLR382050" manufactured by LINTEC, with a thickness of 38 μm) with a width of 715 mm was continuously unwound at a speed of 8 m/min, and the demoulding treated surface thereof was coated with the curable composition prepared above using a slot die coater to form a surface coating layer. The surface coating layer was irradiated with ultraviolet light at an exposure amount of 500 mJ/ ^cm2 (based on 365 nm) to form a hard coating (HC) layer with a thickness of 2 μm, thereby obtaining a first substrate layer (1). The obtained first substrate layer (1) was wound into a roll to prepare a substrate roll. The length of the first substrate layer (1) wound in the substrate roll was 250 m.

(Production of Long-Strip Laminated Body (1) and Wound Body (1))

While continuously drawing out the first substrate layer (1) from the substrate roll (1) obtained above at a speed of 10 m/min and a tension of 120 N, the first composition (1) prepared above was sprayed onto the hard coating layer of the first substrate layer (1) at a flow rate of 57 ml/min using a slit coater, thereby forming a coating layer with a width of 655 mm in the central portion of the first substrate layer (1) (width of 715 mm). Next, the first substrate layer (1) was conveyed in a first ventilation drying furnace set at a temperature of 100° C. for 30 seconds (first drying step), then conveyed in a second ventilation drying furnace set at a temperature of 100° C. for 30 seconds (second drying step), and further dried in a third ventilation drying furnace set at a temperature of 100° C. for 30 seconds (third drying step), thereby removing the solvent. The dried coating layer was irradiated with ultraviolet light at an exposure amount of 410 mJ/cm ² (based on 365 nm) to cure the polymerizable liquid crystal compound in the coating layer to form a light absorption anisotropic layer, thereby obtaining a long laminate (1) with a length of 200 m. The long laminate (1) was rolled into a roll to obtain a roll (1).

(Production of antireflection laminate (1))

The long strip laminate (1) extracted from the roll (1) is cut into a single-piece laminate, and the light absorption anisotropic layer side of the single-piece laminate is subjected to corona treatment. The anti-reflection film prepared above is laminated via an adhesive (manufactured by LINTEC, a pressure-sensitive adhesive with a thickness of 25 μm) so that the polarizing plate side becomes the bonding surface, thereby obtaining an anti-reflection laminate (1).

[Comparative Example 2]

(Preparation of the first composition (2))

A first composition (2) was prepared in the same manner as the first composition (1), except that the amounts of dichroic dye A and dichroic dye B were changed to 1.5 parts of dichroic dye A and 1.5 parts of dichroic dye B. In the first composition (2), the total mass of the dichroic dye relative to the mass of the mixture of the polymerizable liquid crystal compound was 3.0 mass %.

(Production of Long-Strip Laminated Body (2) and Wound 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).

(Production of anti-reflection 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) drawn out from the roll (2).

[Comparative Example 3]

(Production of Long-Strip Laminated Body (3) and Wound Body (3))

Before coating the first composition (2) on the first substrate layer (1), the hard coating layer side of the first substrate layer (1) is subjected to a static elimination treatment using a static elimination rod. Otherwise, the same operation as that for preparing the long-strip laminate (2) and the wound body (2) is performed to obtain a long-strip laminate (3) and a wound body (3).

(Production of anti-reflection 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) drawn out from the roll (3).

[Example 1]

(Production of Long-Strip Laminated Body (4) and Wound Body (4))

Except that the temperatures in the first to third drying steps were changed to the temperatures shown in Table 1, the same procedures as those for preparing the long laminated body (3) and the wound body (3) were carried out to obtain the long laminated body (4) and the wound body (4).

(Production of anti-reflection 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) drawn out from the roll (4).

[Example 2]

(Production of Long-Strip Laminated Body (5) and Wound 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 support roll was cooled to 20°C when the dried coating layer was exposed to ultraviolet light.

(Production of anti-reflection 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) drawn out from the roll (5).

[Examples 3 and 4]

(Production of long laminated bodies (6) and (7), and wound bodies (6) and (7))

Except for changing the temperature of the first drying step to the third drying step to the temperature shown in Table 1, the same operation as the preparation of the long-strip laminate (5) and the wound body (5) was carried out to obtain long-strip laminates (6) and (7), and wound bodies (6) and (7).

(Production of antireflection 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 long laminates (6) and (7) respectively drawn out from rolls (6) and (7).

[Example 5]

(Preparation of the first substrate layer (2))

As the first substrate layer (2), a protective film (Pf) having a PET film (thickness: 38 μm) and an acrylic pressure-sensitive adhesive layer (thickness: 15 μm) was laminated to the release PET film side of the first substrate layer (1).

(Production of Long-Strip Laminated Body (8) and Wound Body (8))

A long laminate (8) and a wound body (8) are obtained in the same manner as in the preparation of the long laminate (6) and the wound body (6), except that the first substrate layer (1) is replaced by the first substrate layer (2). The first composition (2) is applied to the hard coating layer side of the first substrate layer (2).

(Production 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) drawn out from a roll (8).

[Comparative Example 4]

(Preparation of the first substrate layer (3))

A triacetyl cellulose (TAC) film (KC4UY-TAC manufactured by Konica Minolta Co., Ltd., thickness: 25 μm) was prepared as the first substrate layer ( 3 ).

(Production of Long-Strip Laminated Body (9) and Wound 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 substrate layer (1) was changed to the first substrate layer (3).

(Production of anti-reflection 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) drawn out from a roll (9).

[Example 6]

(Preparation of the first substrate layer (4))

A triacetyl cellulose (TAC) film (KC4UY-TAC manufactured by Konica Minolta Co., Ltd., thickness: 40 μm) was prepared as the first substrate layer ( 4 ).

(Production of Long-Strip Laminated Body (10) and Wound Body (10))

A long laminate (10) and a wound body (10) were obtained in the same manner as in the preparation of the long laminate (6) and the wound body (6), except that the first substrate layer (1) was changed to the first substrate layer (4).

(Production of Antireflection Laminated Body (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) drawn out from a roll (10).

[Example 7]

(Preparation of the first substrate layer (5))

As the first substrate layer (5), a protective film (Pf) having a PET film (thickness: 38 μm) and an acrylic adhesive layer (thickness: 15 μm) was laminated onto a triacetylcellulose (TAC) film (KC4UY-TAC manufactured by Konica Minolta Co., Ltd., thickness 40 μm) was prepared.

(Production of Long-Strip Laminated Body (11) and Wound Body (11))

A long laminate (11) and a wound body (11) were obtained in the same manner as in the preparation of the long laminate (6) and the wound body (6), except that the first substrate layer (1) was changed to the first substrate layer (5).

(Production of anti-reflection laminate (11))

The same operation as the preparation of the anti-reflection laminate (1) is performed except that the long-strip laminate (1) is changed to a long-strip laminate (11) drawn out from a roll (11), thereby obtaining an anti-reflection laminate (11). The first composition (2) is applied to the TAC film side (opposite to the protective film side) of the first substrate layer (5).

[Example 8]

(Preparation of the 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 as to have a solid content concentration of 7%.

(Production of Long-Strip Laminated Body (12) and Wound 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).

(Production 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) drawn out from a roll (12).

[Example 9]

(Preparation of the first composition (4))

A first composition (4) was prepared in the same manner as the first composition (1), except that the amounts of dichroic dye A and dichroic dye B were changed to 1.87 parts of dichroic dye A and 1.87 parts of dichroic dye B. In the first composition (4), the total mass of the dichroic dye relative to the mass of the mixture of the polymerizable liquid crystal compound was 3.75 mass %.

(Production of Long-Strip Laminated Body (13) and Wound 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).

(Production 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) drawn out from a roll (13).

[Example 10]

(Preparation of the first composition (5))

A first composition (5) was prepared in the same manner as the first composition (1), except that the amounts of dichroic dye A and dichroic dye B were changed to 1.25 parts of dichroic dye A and 1.25 parts of dichroic dye B. In the first composition (5), the total mass of the dichroic dye relative to the mass of the mixture of the polymerizable liquid crystal compound was 2.5 mass %.

(Production of Long-Strip Laminated Body (14) and Wound 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).

(Production 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) drawn out from a roll (14).

[Example 11]

(Preparation of the 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).

[Chemical formula 10]

[Determination of phase transition temperature]

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

(Production of Long-Strip Laminated Body (15) and Wound Body (15))

The first composition (2) is changed to the first composition (6), and the temperature of the first drying step to the third drying step is changed to the temperature shown in Table 4. Except for this, the same operation is performed as the preparation of the long-strip laminate (8) and the wound body (8), to obtain a long-strip laminate (15) and a wound body (15).

(Production 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) drawn out from a roll (15).

[Example 12]

(Production of Long-Strip Laminated Body (16) and Wound Body (16))

Except for changing the temperatures of the first to third drying steps to the temperatures shown in Table 4, the same operations as those for producing the long laminated body (15) and the wound body (15) were carried out to obtain the long laminated body (16) and the wound body (16).

(Production 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) drawn out from a roll (16).

〔Reference Example 1〕

(Production of a single-sheet laminate)

The first substrate layer (1) drawn out from the substrate roll was cut into a size of 100 mm×120 mm, and the first composition (2) was applied to the hard coating layer of the cut first substrate layer (1) using a bar coater, and dried for 1 minute in a drying oven set at 100° C. Then, ultraviolet rays (under nitrogen atmosphere, wavelength: 365 nm, cumulative light intensity at wavelength 365 nm: 500 mJ/cm ² ) were irradiated using a high-pressure mercury lamp (“Unicure VB-15201BY-A” manufactured by USHIO INC.), thereby curing the polymerizable liquid crystal compound in the coating layer to form a light absorption anisotropic layer, thereby obtaining a single-piece laminate having a light absorption anisotropic layer on the first substrate layer (1).

[Measurement of absorbance of light absorption anisotropic layer]

For each of the long laminated bodies (1) to (16) extracted from the rolls (1) to (16) prepared in the examples and comparative examples, a total of 10 measurement points _P10 were set as follows. The long laminated body extracted from the roll was unwound for about 1 m in the length direction (winding direction), and one point at the center position in the width direction of the position and three points set at equal intervals between the center and the positions located 2.5 cm inside from the two ends, that is, a total of seven points, were used as measurement points in the width direction of the light absorption anisotropic layer. In addition, one point at the center position set in the width direction of the light absorption anisotropic layer and three points set at intervals of 30 cm along the length direction toward the winding axis side (the side opposite to the unwinding side) of the roll were used as measurement points in the length direction of the light absorption anisotropic layer. The laminate of the light absorption anisotropic layer and the first substrate layer was cut out in a size of 4 cm×4 cm so that each of the 10 measurement points _P10 in total became the center. The cut laminate was bonded to glass (size: 4 cm×4 cm, thickness: 0.7 mm) via an adhesive (manufactured by LINTEC, pressure-sensitive adhesive, thickness: 25 μm) so that the light absorption anisotropic layer side became the bonding surface, and the release PET film of the first substrate layer was peeled off to prepare a measurement sample (A).

The measurement sample (A) was placed in an ultraviolet-visible spectrophotometer ("UV-2450" manufactured by Shimadzu Corporation), and after calibration so that the absorbance at a wavelength of 800 nm becomes zero, the absorbance Ax was measured. In addition, after the measurement sample (A) was placed in an inclined manner in the ultraviolet-visible spectrophotometer, after calibration so that the absorbance at a wavelength of 800 nm becomes zero, the absorbance Ax (z = 50°) was measured. The absorbance Ax is the absorbance of the absorption maximum wavelength within the wavelength range of 380 nm to 780 nm of the light absorption anisotropic layer, and is the absorbance of linearly polarized light vibrating in the x-axis direction. 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 light absorption anisotropic layer is rotated 50° with the y-axis as the rotation axis. The x-axis is an arbitrary direction in the plane of the light absorption anisotropic layer, and the y-axis is a direction orthogonal to the x-axis in the plane of the light absorption anisotropic layer. It should be noted that the first substrate layer does not have significant absorption at the above-mentioned absorption maximum wavelength.

The absorbance Ax measured for each 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 sample were determined, and Ax _max (z=50°)/Ax _min (z=50°) was calculated. The results are shown in Tables 1 to 4.

Ten sheets of the single-sheet laminate prepared in Reference Example 1 were prepared, and the absorbance Ax measured for each of the ten sheets of the single-sheet laminate was averaged to calculate the absorbance Ax _av . In addition, the absorbance Ax (z=50°) was measured for the ten sheets of the single-sheet laminate, and Ax _max (z=50°)/Ax _min (z=50°) was calculated from the maximum and minimum values.

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

[Measurement of the thickness of the light absorption anisotropic layer]

The thickness of the light absorption anisotropic layer of the laminated body at each of the 10 measurement points _P10 cut out in the above [Measurement of absorbance of light absorption anisotropic layer] was measured using an interferometric film thickness meter. The measured thicknesses were averaged to obtain the thickness of the light absorption anisotropic layer in the long laminated body. The results are shown in Tables 1 to 4.

Ten single-sheet laminates prepared in Reference Example 1 were prepared, and the thickness of the light absorption anisotropic layer was measured for each of the ten single-sheet laminates. The average value was taken as the thickness of the single-sheet laminate.

[Evaluation of display characteristics]

The antireflection film prepared above was cut into a size of 4 cm × 4 cm. From the long strip laminates (1) to (16) prepared in the examples and comparative examples, 10 laminates for each of the measurement points _P10 were cut out as described in the above [Measurement of the absorbance of the light absorption anisotropic layer]. The light absorption anisotropic layer side of the laminate was subjected to corona treatment, and the antireflection film cut above was laminated with an adhesive (manufactured by LINTEC, a pressure-sensitive adhesive with a thickness of 25 μm) so that the polarizing plate side became the bonding surface to prepare a measurement sample (B).

Regarding Reference Example 1, a measurement sample (B) was prepared in the same manner as above except that the laminated bodies cut out from the long laminated bodies (1) to (16) were changed to the single-sheet laminated body prepared in Reference Example 1.

The display device is taken out by removing the front glass and polarizing plate from the "FlexPai" manufactured by ROYOLE. Next, each measurement sample (B) is attached to the display device via an adhesive (25 μm pressure-sensitive adhesive manufactured by LINTEC) in such a way that the anti-reflection film side becomes the display device side. Then, the power of the display device is turned on (ON), and all settings for changing the screen display color, such as the blue light cutoff function and color balance change, are turned off (OFF) on the basis of maximizing the brightness. In the state where a white screen is displayed (the state where the HTML color code #FFFFFF is displayed), the oblique hue during white display is confirmed and evaluated according to the following criteria. The results are shown in Tables 1 to 4. The oblique hue is the hue visually confirmed from an azimuth angle of 0 to 360° at an elevation angle of 50° when the sample is 30 cm away. The better the evaluation of the display characteristics, it can be said that the less deviation there is in the optical characteristics of the single-sheet laminate cut out from the winding body.

(Evaluation Criteria)

A: When displaying white in a dark room and checking the hue with the naked eye, there is no noticeable unevenness in color between the 10 points.

B: Displaying white in a dark room and checking the hue with the naked eye, slight unevenness in color tone was felt among 10 points.

C: Displaying white in a dark room and checking the hue with the naked eye, uneven color tone is felt among 10 points.

D: When white is displayed in a dark room and the hue is checked with the naked eye, it is felt that the color tone is strongly uneven among 10 points.

E: When white is displayed in a dark room and the hue is checked with the naked eye, very strong unevenness in color tone is felt among 10 points.

[Table 1]

※The ratio (Ax _max /Ax _min ) is the value of Ax _max (z=50°)/Ax _min (z=50°).

[Table 2]

※The ratio (Ax _max /Ax _min ) is the value of Ax _max (z=50°)/Ax _min (z=50°).

[Table 3]

※The ratio (Ax _max /Ax _min ) is the value of Ax _max (z=50°)/Ax _min (z=50°).

[Table 4]

Claims (11)

1. A wound body obtained by winding a laminate including a substrate layer and a light absorption anisotropic layer formed on the substrate layer into a roll shape, The light absorption anisotropic layer is formed of a composition including a dichroic pigment and a liquid crystal compound, has an absorption axis in a direction perpendicular to the surface of the light absorption anisotropic layer, and satisfies the relationship of 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 maximum value and the minimum value when the absorbance Ax (z=50°) is measured at 10 measurement points set on the light absorption anisotropic layer included in the laminate, the absorbance Ax (z=50°) is the absorbance of the absorption maximum wavelength within the wavelength range of 380 nm to 780 nm of the light absorption anisotropic layer, and is the absorbance of linearly polarized light vibrating in the x-axis direction when the light absorption anisotropic layer is rotated 50° with the y-axis as the rotation axis, Wherein, the x-axis is any direction within the plane of the light absorption anisotropic layer, The y-axis is a direction orthogonal to the x-axis within the plane of the light absorption anisotropic layer. 2. The wound body according to claim 1, wherein the light absorption anisotropic layer satisfies the relationship of the following formula (II): Ax _av <0.050(II) In formula (II), _Axav is an average value obtained when absorbance Ax is measured at the measurement points. The absorbance Ax is the absorbance of the light absorption anisotropic layer at the absorption maximum wavelength and is the absorbance of linearly polarized light vibrating in the x-axis direction. 3 . The wound body according to claim 1 , wherein an average value of the thickness of the light absorption anisotropic layer measured at the measurement points 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 material layer is not less than 30 μm and not more than 150 μm. 5. The wound body according to claim 1, wherein the light absorption anisotropic layer satisfies the relationship of the following formula (i): Ax _max (z＝50°)/Ax _min (z＝50°)≤1.08 (i) In the formula (i), Ax _max (z=50°) and Ax _min (z=50°) are as described above. 6. The wound body according to claim 1, wherein the light absorption anisotropic layer satisfies the relationship of the following formula (ii): Ax _max (z＝50°)/Ax _min (z＝50°)<1.05 (ii) In the formula (ii), Ax _max (z=50°) and Ax _min (z=50°) are as described above. The wound body according to claim 1 , wherein the laminate further comprises an antireflection film. The wound body according to claim 7 , wherein the anti-reflection film is an elliptically polarizing plate. 9. Organic EL display device, [a] The organic EL display device comprises the light absorption anisotropic layer, the antireflection film, and the image display element contained in the laminated body cut out from the roll according to any one of claims 1 to 6, or [b] The organic EL display device comprises the light absorption anisotropic layer and the antireflection film contained in the laminated body cut out from the wound body according to claim 7 or 8, and an image display element. 10. A method for producing a wound body, which is the method for producing a wound body according to any one of claims 1 to 8, comprising the following steps: Step (1), unwinding the substrate layer from a substrate roll obtained by winding the substrate layer and conveying the substrate layer; Step (2), forming the light absorption anisotropic layer on the substrate layer to obtain the laminate; and In step (3), the laminate is wound into a roll. 11. The method for producing a wound body according to claim 10, wherein the step (2) comprises the following steps: Step (2a), coating a composition containing one or more dichroic dyes on the substrate layer to form a coating layer; and Step (2b) of drying the coating layer.