Light Absorbing Anisotropic Film, Optical Film, and Liquid Crystal Display Device

Abstract

The present invention addresses the problem of providing: a light absorption anisotropic film which has few defects even in cases where the concentration of a dichroic substance is high, while having a high degree of orientation; an optical film; and a liquid crystal display device. A light absorption anisotropic film according to the present invention is formed from a liquid crystal composition that contains a liquid crystalline compound and a dichroic substance; the total amount of a dichroic substance represented by formula (C-1) and a dichroic substance represented by formula (C-2) is 4.5% by mass or more relative to the total mass of the solid content of the liquid crystal composition; and the liquid crystalline compound is vertically aligned. In cases where Ra1 and Ra2 represent the same group, -N(Rb11)(Rb12) and -N(Rb21)(Rb22) represent different groups. In cases where Ra1 and Ra2 represent different groups, -N(Rb11)(Rb12) and -N(Rb21)(Rb22) may represent the same group or different groups.

Description

Technical Field

[0001] The present invention relates to a light absorption anisotropic film, an optical film, and a liquid crystal display device.

Background Art

[0002] For preventing peeping and controlling the viewing angle of an image display device, a technique of using a light absorption anisotropic film having an absorption axis in the thickness direction is known. For example, Patent Document 1 discloses a viewing angle control system having a polarizer (light absorption anisotropic film) containing a dichroic substance and having an angle of 0° to 45° between the absorption axis and the normal of the film surface.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For preventing peeping and controlling the viewing angle of an image display device, it is important to ensure high light shielding properties. For this purpose, it is important to increase the concentration of the dichroic substance in the light absorption anisotropic film and to orient the dichroic substance at a high degree of orientation in the photo-aligned film. However, when the concentration of the dichroic substance is increased, defects derived from the dichroic substance may occur in the light absorption anisotropic film.

[0005] Therefore, an object of the present invention is to provide a light absorption anisotropic film, an optical film, and a liquid crystal display device having few defects and a high degree of orientation even when the concentration of the dichroic substance is high.

Means for Solving the Problems

[0006] As a result of intensive studies to solve the above problems, the inventors of the present invention have found that even when a high-concentration dichroic substance of 4.5% by mass or more with respect to the total solid mass of the liquid crystal composition is contained, by using two or more types of dichroic substances having different structures, a light absorption anisotropic film with few defects and a high degree of orientation can be obtained, and thus the present invention has been completed. That is, the inventors of the present invention have found that the above problems can be solved by the following configuration.

[0007] [1] A light absorption anisotropic film formed from a liquid crystal composition containing a liquid crystalline compound, a dichroic substance represented by the following formula (C-1), and a dichroic substance represented by the following formula (C-2), wherein the total content of the dichroic substance represented by the following formula (C-1) and the dichroic substance represented by the following formula (C-2) is 4.5% by mass or more with respect to the total solid mass of the liquid crystal composition, and the liquid crystalline compound is vertically aligned. In the following formula (C-1) and the following formula (C-2), R a1 and R a2 each independently represents a hydrogen atom, a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms which may have a monovalent substituent, or a monovalent group in which -CH 2 - constituting the monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms which may have a monovalent substituent is substituted with a divalent substituent. Ara and Arc each independently represent a divalent aromatic group which may have a monovalent substituent. R b11 , R b21 and R b22 each independently represents a hydrogen atom, a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms which may have a monovalent substituent, or a monovalent group in which -CH 2 - constituting the monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms which may have a monovalent substituent is substituted with a divalent substituent. R b12represents a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms with a monovalent substituent, or a monovalent group in which -CH 2 - constituting a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms which may have a monovalent substituent is substituted with a divalent substituent. na and nc each independently represent an integer of 0 to 3, and na + nc is 2 or more. However, when R a1 and R a2 are the same group, -N(R b11 )(R b12 ) and -N(R b21 )(R b22 ) are different groups. Also, when R a1 and R a2 are different groups, -N(R b11 )(R b12 ) and -N(R b21 )(R b22 ) may be the same group or different groups. [2] The total content of the dichroic substance represented by the following formula (C-1) and the dichroic substance represented by the following formula (C-2) is 6.5% by mass or more with respect to the total solid mass of the liquid crystal composition, the light absorption anisotropic film according to [1]. [3」 In the liquid crystal composition, the mass ratio of the content of the dichroic substance represented by the following formula (C-1) to the content of the dichroic substance represented by the following formula (C-2) is 0.100 to 10.0, the light absorption anisotropic film according to [1] or [2]. [4] In the following formula (C-1), the value of the Hansen solubility parameter of R b12 is equal to or greater than the value of the Hansen solubility parameter of R b11 , In the following formula (C-2), the value of the Hansen solubility parameter of R b22 is equal to or greater than the value of the Hansen solubility parameter of R b21 , R b12 in the following formula (C-1) and R b22and the light absorption anisotropic film according to any one of [1] to [3], wherein the absolute value of the difference in Hansen solubility parameters between them is 3.0 or less. [5] R in the following formula (C-1) b12 and R in the following formula (C-2) b22 and the light absorption anisotropic film according to [4], wherein the absolute value of the difference in Hansen solubility parameters between them is 1.0 or less. [6] R in the following formula (C-2) b22 is a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms with a monovalent substituent, or -CH that constitutes a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms that may have a monovalent substituent 2 - is a monovalent group substituted with a divalent substituent, and the light absorption anisotropic film according to any one of [1] to [5]. [7] R in the following formula (C-1) b12 in which the monovalent substituent is a hydroxyl group, a halogen atom, a cyano group, or a sulfonic acid group, the divalent substituent is -O-, -C(=O)-, -N(R c1 )-, or a group formed by combining two or more of these groups, and R c1 represents a hydrogen atom or an alkyl group, and the light absorption anisotropic film according to any one of [1] to [6]. [8] The light absorption anisotropic film according to any one of [1] to [7], wherein the liquid crystal compound contains a polymer liquid crystal compound. [9] An optical film having a transparent film substrate and a light absorption anisotropic film according to any one of [1] to [8] disposed on the transparent film substrate.

[10] Furthermore, the optical film according to [9], having an alignment film between the transparent film substrate and the light absorption anisotropic film.

[11] Furthermore, having a polarizer having an absorption axis in the plane, and used for controlling the viewing angle, the optical film according to [9] or

[10] .

[12] A display device having the optical film described in

[11] and a display element.

Advantages of the Invention

[0008] According to the present invention, even when the concentration of the dichroic substance is high, it is possible to provide a light absorption anisotropic film, an optical film, and a liquid crystal display device with few defects and high alignment degree.

Embodiments for Carrying Out the Invention

[0009] Hereinafter, the present invention will be described in detail. The description of the constituent elements described below may be made based on typical embodiments of the present invention, but the present invention is not limited to such embodiments. In this specification, a numerical range represented by "~" means a range including the numerical values described before and after "~" as the lower limit value and the upper limit value. Also, in this specification, each component may be used alone as one kind of substance corresponding to each component, or two or more kinds may be used in combination. Here, when two or more kinds of substances are used in combination for each component, the content of that component refers to the total content of the substances used in combination, unless otherwise specified. Also, in this specification, "(meth)acrylate" is a notation representing "acrylate" or "methacrylate", "(meth)acrylic" is a notation representing "acrylic" or "methacrylic", "(meth)acryloyl" is a notation representing "acryloyl" or "methacryloyl", and "(meth)acrylic acid" is a notation representing "acrylic acid" or "methacrylic acid". Also, in this specification, the dichroic substance means a dye having different absorbances depending on the direction. Also, in this specification, transparent means that, unless otherwise specified, the light transmittance in the visible light wavelength range of 380 to 780 nm is 60% or more. The light transmittance is measured using "Plastics - Method for Determining Total Light Transmittance and Total Light Reflectance" of JIS (Japanese Industrial Standard) K 7375:2008.

[0010] [Optical Absorption Anisotropic Film] The optical absorption anisotropic film of the present invention is an optical absorption anisotropic film formed from a liquid crystal composition containing a liquid crystalline compound, a dichroic substance represented by the following formula (C-1) (hereinafter, also referred to as "dichroic substance C-1"), and a dichroic substance represented by the following formula (C-2) (hereinafter, also referred to as "dichroic substance C-2"). The total amount of the dichroic substance C-1 and the dichroic substance C-2 is 4.5% by mass or more based on the total solid mass of the liquid crystal composition, and the liquid crystalline compound is vertically aligned. The optical absorption anisotropic film of the present invention has few defects and a high degree of alignment despite the high content of the dichroic substance. Although the details of the reason are not clear, it is generally estimated as follows. When forming an optical absorption anisotropic film with a high concentration of a dichroic substance, the dichroic substance is likely to crystallize during the formation process of the optical absorption anisotropic film, and the crystallized dichroic substance may cause defects in the optical absorption anisotropic film. Here, the dichroic substance C-1 and the dichroic substance C-2 contained in the optical absorption anisotropic film of the present invention have similar structures to each other but are not completely identical compounds. Therefore, it is presumed that while ensuring the effect of improving the degree of alignment by using dichroic substances with similar structures, the occurrence of defects that occur when a large amount of the same compound is used can also be suppressed.

[0011] [Liquid Crystal Composition] The liquid crystal composition used for forming the optical absorption anisotropic film of the present invention contains a liquid crystalline compound, a dichroic substance C-1, and a dichroic substance C-2. The liquid crystal composition may contain, if necessary, other dichroic substances other than the dichroic substance C-1 and the dichroic substance C-2, a solvent, a polymerization initiator, an interface improver, a vertical alignment agent, and other components. Hereinafter, each component will be described.

[0012] [Liquid Crystalline Compound] The liquid crystal composition contains a liquid crystalline compound. By containing the liquid crystalline compound, the dichroic substance can be aligned with a high degree of alignment while suppressing the precipitation of the dichroic substance. The liquid crystalline compound is a liquid crystalline compound that does not exhibit dichroism. As the liquid crystalline compound, either a low molecular liquid crystalline compound or a high molecular liquid crystalline compound can be used, but the high molecular liquid crystalline compound is more preferable for obtaining a high degree of orientation. Here, the "low molecular liquid crystalline compound" refers to a liquid crystalline compound having no repeating unit in its chemical structure. Further, the "high molecular liquid crystalline compound" refers to a liquid crystalline compound having a repeating unit in its chemical structure. Examples of the low molecular liquid crystalline compound include the liquid crystalline compounds described in JP-A-2013-228706. Examples of the high molecular liquid crystalline compound include the thermotropic liquid crystalline polymers described in JP-A-2011-237513. Further, the high molecular liquid crystalline compound may have a crosslinkable group (for example, an acryloyl group and a methacryloyl group) at its terminal. The liquid crystalline compound may be used alone or in combination of two or more. From the viewpoint of more excellent orientation degree of the light absorption anisotropic film, the liquid crystalline compound preferably contains a high molecular liquid crystalline compound.

[0013] Due to the reason that the orientation degree of the dichroic substance is more excellent, the liquid crystalline compound is preferably a high molecular liquid crystalline compound containing a repeating unit represented by the following formula (3-1) (hereinafter, also referred to as "repeating unit (3-1)").

[0014]

Chemical formula

[0015] In the above formula (3-1), P1 represents the main chain of the repeating unit, L1 represents a single bond or a divalent linking group, SP1 represents a spacer group, M1 represents a mesogen group, and T1 represents a terminal group.

[0016] In the repeating unit (3-1), it is preferable that the difference between the logP values of P1, L1, and SP1 and the logP value of M1 is 4 or more. More preferably, it is 4.5 or more. Since the logP values of the main chain, L1, and the spacer group and the log value of the mesogen group are separated by a predetermined value or more, the compatibility between the structure from the main chain to the spacer group and the mesogen group is in a low state. As a result, it is presumed that the crystallinity of the polymer liquid crystalline compound is high and the degree of orientation of the polymer liquid crystalline compound is high. Thus, when the degree of orientation of the polymer liquid crystalline compound is high, the compatibility between the polymer liquid crystalline compound and the dichroic substance decreases (that is, the crystallinity of the dichroic substance improves), and it is presumed that the degree of orientation of the dichroic substance improves. As a result, it is considered that the degree of orientation of the obtained light absorption anisotropic film becomes high.

[0017] Specific examples of the main chain of the repeating unit represented by P1 include, for example, groups represented by the following formulas (P1-A) to (P1-D). Among them, from the viewpoints of the diversity of the monomer as a raw material and ease of handling, the group represented by the following formula (P1-A) is preferable.

[0018]

Chemical formula

[0019] In the formulas (P1-A) to (P1-D), “*” represents the bonding position with L1 in the formula (3-1). In the above formulas (P1-A) to (P1-D), R 1 , R 2 , R 3 and R 4 each independently represent a hydrogen atom, a halogen atom, a cyano group, an alkyl group having 1 to 10 carbon atoms, or an alkoxy group having 1 to 10 carbon atoms. The above alkyl group may be a linear or branched alkyl group, or an alkyl group having a cyclic structure (cycloalkyl group). Further, the number of carbon atoms of the above alkyl group is preferably 1 to 5. The group represented by the above formula (P1-A) is preferably a unit of the partial structure of a poly(meth)acrylate obtained by polymerization of a (meth)acrylate. The group represented by the above formula (P1-B) is preferably an ethylene glycol unit formed by ring-opening polymerization of an epoxy group of a compound having an epoxy group. The group represented by the above formula (P1-C) is preferably a propylene glycol unit formed by ring-opening polymerization of an oxetane group of a compound having an oxetane group. The group represented by the above formula (P1-D) is preferably a siloxane unit of polysiloxane obtained by polycondensation of a compound having at least one of an alkoxysilyl group and a silanol group. Here, examples of the compound having at least one of an alkoxysilyl group and a silanol group include a compound having a group represented by the formula SiR 14 (OR 15 ) 2 -. In the formula, R 14 is synonymous with R 14 in (P1-D), and a plurality of R 15 each independently represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms.

[0020] L1 is a single bond or a divalent linking group. Examples of the divalent linking group represented by L1 include -C(O)O-, -OC(O)-, -O-, -S-, -C(O)NR 3 -, -NR 3 C(O)-, -SO 2 -, and -NR 3 R 4 -. In the formula, R 3 and R 4 each independently represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms which may have a substituent (described later). When P1 is a group represented by the formula (P1-A), L1 is preferably a group represented by -C(O)O- because the degree of orientation of the light absorption anisotropic film is more excellent. When P1 is a group represented by the formulas (P1-B) to (P1-D), L1 is preferably a single bond because the degree of orientation of the light absorption anisotropic film is more excellent.

[0021] The spacer group represented by SP1 preferably contains at least one structure selected from the group consisting of an oxyethylene structure, an oxypropylene structure, a polysiloxane structure, and a fluorinated alkylene structure because it is easy to exhibit liquid crystallinity and for reasons such as the availability of raw materials. Here, the oxyethylene structure represented by SP1 is preferably a group represented by *-(CH 2 -CH 2 O) n1 -*. In the formula, n1 represents an integer of 1 to 20, and * represents the bonding position with L1 or M1 in the above formula (3-1). n1 is preferably an integer of 2 to 10, more preferably an integer of 2 to 4, and most preferably 3 because the degree of orientation of the light absorption anisotropic film is more excellent. Also, the oxypropylene structure represented by SP1 is preferably a group represented by *-(CH(CH 3 )-CH 2 O) n2 -*. In the formula, n2 represents an integer of 1 to 3, and * represents the bonding position with L1 or M1. Also, the polysiloxane structure represented by SP1 is preferably a group represented by *-(Si(CH 3 ) 2 -O) n3 -*. In the formula, n3 represents an integer of 6 to 10, and * represents the bonding position with L1 or M1. Also, the fluorinated alkylene structure represented by SP1 is preferably a group represented by *-(CF 2 -CF 2 ) n4 -*. In the formula, n4 represents an integer of 6 to 10, and * represents the bonding position with L1 or M1.

[0022] The mesogenic group represented by M1 is a group that represents the main skeleton of liquid crystal molecules contributing to liquid crystal formation. Liquid crystal molecules exhibit liquid crystallinity, which is an intermediate state (mesophase) between the crystalline state and the isotropic liquid state. There are no particular restrictions on the mesogenic group. For example, reference can be made to "Flussige Kristalle in Tabellen II" (published by VEB Deutsche Verlag fur Grundstoff Industrie, Leipzig, in 1984), particularly the descriptions on pages 7 to 16, and "Liquid Crystal Handbook" edited by the Liquid Crystal Handbook Editorial Committee (published by Maruzen, in 2000), particularly the descriptions in Chapter 3. As the mesogenic group, for example, a group having at least one cyclic structure selected from the group consisting of an aromatic hydrocarbon group, a heterocyclic group, and an alicyclic group is preferable. The mesogenic group preferably has an aromatic hydrocarbon group, more preferably has 2 to 4 aromatic hydrocarbon groups, and even more preferably has 3 aromatic hydrocarbon groups, because the degree of orientation of the photoabsorption anisotropic film is more excellent.

[0023] As the mesogenic group, from the viewpoints of the expression of liquid crystallinity, the adjustment of the liquid crystal phase transition temperature, the availability of raw materials, and synthetic suitability, and because the degree of orientation of the photoabsorption anisotropic film is more excellent, a group represented by the following formula (M1-A) or the following formula (M1-B) is preferable, and a group represented by the formula (M1-B) is more preferable.

[0024]

Chemical formula

[0025] In formula (M1-A), A1 is a divalent group selected from the group consisting of an aromatic hydrocarbon group, a heterocyclic group, and an alicyclic group. These groups may be substituted with an alkyl group, a fluorinated alkyl group, an alkoxy group, or a substituent. The divalent group represented by A1 is preferably a 4- to 6-membered ring. Also, the divalent group represented by A1 may be a monocyclic ring or a condensed ring. * represents the bonding position with SP1 or T1.

[0026] Examples of the divalent aromatic hydrocarbon group represented by A1 include a phenylene group, a naphthylene group, a fluorene-diyl group, an anthracene-diyl group, and a tetracene-diyl group. From the viewpoints of the diversity of the mesogen skeleton design and the availability of raw materials, a phenylene group or a naphthylene group is preferable, and a phenylene group is more preferable.

[0027] The divalent heterocyclic group represented by A1 may be either aromatic or non-aromatic, but from the viewpoint of further improving the degree of orientation, it is preferably a divalent aromatic heterocyclic group. Examples of the atoms other than carbon that constitute the divalent aromatic heterocyclic group include a nitrogen atom, a sulfur atom, and an oxygen atom. When the aromatic heterocyclic group has a plurality of atoms other than carbon that constitute the ring, these may be the same or different. Specific examples of the divalent aromatic heterocyclic group include, for example, a pyridylene group (pyridine-diyl group), a pyridazine-diyl group, an imidazole-diyl group, a thienylene (thiophene-diyl group), a quinolyrene group (quinoline-diyl group), an isoquinolyrene group (isoquinoline-diyl group), an oxazole-diyl group, a thiazole-diyl group, an oxadiazole-diyl group, a benzothiazole-diyl group, a benzothiadiazole-diyl group, a phthalimide-diyl group, a thienothiazole-diyl group, a thiazolothiazole-diyl group, a thienothiophene-diyl group, and a thienooxazole-diyl group.

[0028] Specific examples of the divalent alicyclic group represented by A1 include a cyclopentylene group and a cyclohexylene group.

[0029] In formula (M1-A), a1 represents an integer of 1 to 10. When a1 is 2 or more, the plurality of A1s may be the same or different.

[0030] In formula (M1-B), A2 and A3 are each independently a divalent group selected from the group consisting of an aromatic hydrocarbon group, a heterocyclic group, and an alicyclic group. Specific examples and preferred embodiments of A2 and A3 are the same as those of A1 in formula (M1-A), and thus the description thereof is omitted. In formula (M1-B), a2 represents an integer from 1 to 10. When a2 is 2 or more, the plurality of A2s may be the same or different, the plurality of A3s may be the same or different, and the plurality of LA1s may be the same or different. For the reason that the degree of orientation of the light absorption anisotropic film is more excellent, a2 is preferably an integer of 2 or more, and more preferably 2. In formula (M1-B), when a2 is 1, LA1 is a divalent linking group. When a2 is 2 or more, the plurality of LA1s are each independently a single bond or a divalent linking group, and at least one of the plurality of LA1s is a divalent linking group. When a2 is 2, for the reason that the degree of orientation of the light absorption anisotropic film is more excellent, among the two LA1s, it is preferable that one is a divalent linking group and the other is a single bond.

[0031] In formula (M1-B), examples of the divalent linking group represented by LA1 include -O-, -(CH 2 ) g -, -(CF 2 ) g -, -Si(CH 3 ) 2 -, -(Si(CH 3 ) 2 O) g -, -(OSi(CH 3 ) 2 ) g -(where g represents an integer from 1 to 10), -N(Z)-, -C(Z)=C(Z’)-, -C(Z)=N-, -N=C(Z)-, -C(Z) 2 -C(Z’) 2-, -C(O)-, -OC(O)-, -C(O)O-, -O-C(O)O-, -N(Z)C(O)-, -C(O)N(Z)-, -C(Z)=C(Z’)-C(O)O-, -O-C(O)-C(Z)=C(Z’)-, -C(Z)=N-, -N=C(Z)-, -C(Z)=C(Z’)-C(O)N(Z'')-, -N(Z'')-C(O)-C(Z)=C(Z’)-, -C(Z)=C(Z’)-C(O)-S-, -S-C(O)-C(Z)=C(Z’)-, -C(Z)=N-N=C(Z’)- (Z, Z’, Z'' independently represent hydrogen, a C1-C4 alkyl group, a cycloalkyl group, an aryl group, a cyano group, or a halogen atom), -C≡C-, -N=N-, -S-, -S(O)-, -S(O)(O)-, -(O)S(O)O-, -O(O)S(O)O-, -SC(O)-, and -C(O)S-, etc. Among them, -C(O)O- is preferred because the degree of orientation of the light absorption anisotropic film is more excellent. LA1 may be a group combining two or more of these groups.

[0032] Specific examples of M1 include, for example, the following structures. In the following specific examples, "Ac" represents an acetyl group.

[0033]

Chemical formula

Chemical formula

Chemical formula

[0034]

Chemical formula

Chemical formula

Chemical formula

Chemical formula

[0035] As the terminal group represented by T1, a hydrogen atom, a halogen atom, a cyano group, a nitro group, a hydroxy group, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an alkylthio group having 1 to 10 carbon atoms, an alkoxycarbonyloxy group having 1 to 10 carbon atoms, an alkoxycarbonyl group having 1 to 10 carbon atoms (ROC(O)-: R is an alkyl group), an acyloxy group having 1 to 10 carbon atoms, an acylamino group having 1 to 10 carbon atoms, an alkoxycarbonylamino group having 1 to 10 carbon atoms, a sulfonylamino group having 1 to 10 carbon atoms, a sulfamoyl group having 1 to 10 carbon atoms, a carbamoyl group having 1 to 10 carbon atoms, a sulfinyl group having 1 to 10 carbon atoms, and a ureido group having 1 to 10 carbon atoms, a group containing a (meth)acryloyloxy group, etc. may be mentioned. Examples of the group containing a (meth)acryloyloxy group include a group represented by -L-A (L represents a single bond or a linking group. Specific examples of the linking group are the same as those of L1 and SP1 described above. A represents a (meth)acryloyloxy group). T1 is preferably an alkoxy group having 1 to 10 carbon atoms, more preferably an alkoxy group having 1 to 5 carbon atoms, and even more preferably a methoxy group, because the degree of orientation of the light absorption anisotropic film is more excellent. These terminal groups may be further substituted by these groups or the polymerizable groups described in JP-A-2010-244038. The number of atoms in the main chain of T1 is preferably 1 to 20, more preferably 1 to 15, even more preferably 1 to 10, and particularly preferably 1 to 7, because the degree of orientation of the light absorption anisotropic film is more excellent. When the number of atoms in the main chain of T1 is 20 or less, the degree of orientation of the light absorption anisotropic film is further improved. Here, the "main chain" in T1 means the longest molecular chain that binds to M1, and a hydrogen atom is not counted in the number of atoms in the main chain of T1. For example, when T1 is an n-butyl group, the number of atoms in the main chain is 4, and when T1 is a sec-butyl group, the number of atoms in the main chain is 3.

[0036] The content of the repeating unit (3-1) is preferably 20 to 100% by mass based on 100% by mass of all the repeating units of the polymer liquid crystalline compound, because the orientation degree of the light absorption anisotropic film is more excellent. In the present invention, the content of each repeating unit contained in the polymer liquid crystalline compound is calculated based on the charged amount (mass) of each monomer used to obtain each repeating unit. The repeating unit (3-1) may be contained alone as one kind or two or more kinds in the polymer liquid crystalline compound. When the polymer liquid crystalline compound contains two or more kinds of the repeating unit (3-1), there are advantages such as the improvement of the solubility of the polymer liquid crystalline compound in a solvent and the easy adjustment of the liquid crystal phase transition temperature. When two or more kinds of the repeating unit (3-1) are contained, it is preferable that the total amount thereof is within the above range.

[0037] When the polymer liquid crystalline compound contains two kinds of the repeating unit (3-1), it is preferable that the terminal group represented by T1 in one (repeating unit A) is an alkoxy group and the terminal group represented by T1 in the other (repeating unit B) is a group other than an alkoxy group, because the orientation degree of the light absorption anisotropic film is more excellent. The terminal group represented by T1 in the repeating unit B is preferably an alkoxycarbonyl group, a cyano group, or a group containing a (meth)acryloyloxy group, and more preferably an alkoxycarbonyl group or a cyano group, because the orientation degree of the light absorption anisotropic film is more excellent. The ratio (A / B) of the content of the repeating unit A in the polymer liquid crystalline compound to the content of the repeating unit B in the polymer liquid crystalline compound is preferably 50 / 50 to 95 / 5, more preferably 60 / 40 to 93 / 7, and further preferably 70 / 30 to 90 / 10, because the orientation degree of the light absorption anisotropic film is more excellent.

[0038] <Repeating unit (3-2)> The polymeric liquid crystalline compound of the present invention may further contain a repeating unit represented by the following formula (3-2) (also referred to as "repeating unit (3-2)" in this specification). Thereby, there are advantages such as improvement in the solubility of the polymeric liquid crystalline compound in a solvent and ease of adjustment of the liquid crystal phase transition temperature. The repeating unit (3-2) is different from the repeating unit (3-1) in that it has at least no mesogenic group. When the polymeric liquid crystalline compound contains the repeating unit (3-2), the polymeric liquid crystalline compound is a copolymer of the repeating unit (3-1) and the repeating unit (3-2) (it may further be a copolymer containing the repeating unit A and the repeating unit B), and may be any polymer such as a block polymer, an alternating polymer, a random polymer, and a graft polymer.

[0039] [Chemical formula]

[0040] In formula (3-2), P3 represents the main chain of the repeating unit, L3 represents a single bond or a divalent linking group, SP3 represents a spacer group, and T3 represents a terminal group. Specific examples of P3, L3, SP3, and T3 in formula (3-2) are the same as those of P1, L1, SP1, and T1 in the above formula (3-1), respectively. Here, from the viewpoint of improving the strength of the photoabsorptive anisotropic film, T3 in formula (3-2) preferably has a polymerizable group.

[0041] When containing the repeating unit (3-2), the content is preferably 0.5 to 40% by mass, more preferably 1 to 30% by mass, based on 100% by mass of all the repeating units of the polymeric liquid crystalline compound. The repeating unit (3-2) may be contained alone or in two or more kinds in the polymeric liquid crystalline compound. When two or more kinds of the repeating unit (3-2) are contained, it is preferable that the total amount is within the above range.

[0042] (Weight-average molecular weight) The weight-average molecular weight (Mw) of the high-molecular liquid crystalline compound is preferably from 1,000 to 500,000, more preferably from 2,000 to 300,000, because the degree of orientation of the light absorption anisotropic film is more excellent. If the Mw of the high-molecular liquid crystalline compound is within the above range, the handling of the high-molecular liquid crystalline compound becomes easy. In particular, from the viewpoint of suppressing cracks during coating, the weight-average molecular weight (Mw) of the high-molecular liquid crystalline compound is preferably 10,000 or more, more preferably from 10,000 to 300,000. Also, from the viewpoint of the temperature latitude of the degree of orientation, the weight-average molecular weight (Mw) of the high-molecular liquid crystalline compound is preferably less than 10,000, preferably from 2,000 or more and less than 10,000. Here, the weight-average molecular weight and number-average molecular weight in the present invention are values measured by gel permeation chromatography (GPC) method. · Solvent (eluent): N-methylpyrrolidone · Apparatus name: TOSOH HLC-8220GPC · Column: Three TOSOH TSKgel Super AWM-H (6 mm × 15 cm) columns are connected and used. · Column temperature: 25 °C · Sample concentration: 0.1 mass% · Flow rate: 0.35 mL / min · Calibration curve: A calibration curve using 7 samples of TOSOH-made TSK standard polystyrene with Mw = 2,800,000 to 1,050 (Mw / Mn = 1.03 to 1.06) is used.

[0043] (Content of liquid crystalline compound) The content of the liquid crystalline compound is preferably from 30 to 99 mass%, more preferably from 50 to 98 mass%, particularly preferably from 60 to 95 mass% with respect to the total solid content mass of the liquid crystal composition. When the content of the liquid crystalline compound is within the above range, the degree of orientation of the light absorption anisotropic film is further improved. The content of the liquid crystalline compound in the light absorption anisotropic film with respect to the total mass of the light absorption anisotropic film is preferably the same as the content of the liquid crystalline compound with respect to the total solid content mass of the above-described liquid crystal composition.

[0044] <Dichroic substances C-1 and C-2> The dichroic substance C-1 is a dichroic substance represented by formula (C-1), and the dichroic substance C-2 is a dichroic substance represented by formula (C-2). In the light absorption anisotropic film, the dichroic substance C-1 and the dichroic substance C-2 may be polymerized. The dichroic substance C-1 and the dichroic substance C-2 may or may not exhibit liquid crystallinity. When the dichroic substance C-1 and the dichroic substance C-2 exhibit liquid crystallinity, they may exhibit either nematic or smectic properties. The temperature range showing the liquid crystal phase is preferably from room temperature (about 20 °C to 28 °C) to 300 °C, and more preferably from 50 °C to 200 °C from the viewpoints of handleability and manufacturing suitability.

[0045]

Chemical formula

[0046] The dichroic substance C-1 and the dichroic substance C-2 are compounds having different chemical structures from each other. Specifically, in formula (C-1) and formula (C-2), when R a1 and R a2 are the same group, -N(R b11 )(R b12 ) and -N(R b21 )(R b22 ) are different groups. Also, when R a1 and R a2 are different groups, -N(R b11 )(R b12 ) and -N(R b21 )(R b22 ) may be the same group or different groups.

[0047] Between formula (C-1) and formula (C-2), those with the same symbol mean the same thing. Specifically, Ara and Arc in formula (C-1) respectively mean the same group as Ara and Arc in formula (C-2), and na and nc in formula (C-1) respectively mean the same numerical values as na and nc in formula (C-2).

[0048] In Formula (C-1) and Formula (C-2), R a1 and R a2 each independently represents a hydrogen atom, a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms which may have a monovalent substituent, or a -CH 2 - of a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms which may have a monovalent substituent is substituted with a divalent substituent (hereinafter also referred to as "monovalent group A1"). Among them, the monovalent group A1 is preferred because at least one of the degree of orientation and defect suppression is more excellent. The monovalent aliphatic hydrocarbon group may be saturated or unsaturated, but is preferably saturated. The monovalent aliphatic hydrocarbon group may be linear, branched or cyclic, but is preferably linear or branched. The monovalent aliphatic hydrocarbon group is preferably an alkyl group because the degree of orientation is more excellent. The number of carbon atoms of the monovalent aliphatic hydrocarbon group is 1 to 20, preferably 5 to 18, and particularly preferably 10 to 15, because at least one of the degree of orientation and defect suppression is more excellent. Examples of the monovalent substituent include the groups shown in the item "substituent" described later. Among them, a halogen atom, a hydroxyl group, or a cyano group is preferred. Specific examples of the divalent substituent include -O-, -C(=O)-, -N(R c1 )-, -S-, -C(=S)-, -S(=O)-, or a group formed by combining two or more of these groups. Among them, -O-, -C(=O)-, -N(R c1 )-, or a group formed by combining two or more of these groups is preferred because at least one of the degree of orientation and defect suppression is more excellent. Among them, the divalent substituent preferably has an oxygen atom because at least one of the degree of orientation and defect suppression is more excellent. R c1 represents a hydrogen atom or an alkyl group, and a hydrogen atom is preferred. The number of carbon atoms of the alkyl group is not particularly limited, preferably 1 to 3, and particularly preferably 1. The monovalent group A1 is one -CH 2- alone may be substituted with a divalent substituent, and two or more -CH 2 - may be substituted with a divalent substituent. Preferred embodiments of the monovalent group A1 include an alkyl group -C(=O)-O-alkylene group -O-, and an alkenyl group -C(=O)-O-alkylene group -O-.

[0049] Ara and Arc each independently represent a divalent aromatic group which may have a monovalent substituent. From the viewpoint that at least one of the degree of orientation and defect suppression is more excellent, a divalent aromatic group (that is, a divalent aromatic group having no monovalent substituent) is preferred. Examples of the divalent aromatic group include an arylene group and a heteroarylene group. From the viewpoint that at least one of the degree of orientation and defect suppression is more excellent, an arylene group is preferred. The number of carbon atoms of the arylene group is not particularly limited, preferably 4 to 20, more preferably 6 to 12. Specific examples of the arylene group include a phenylene group and a naphthylene group. From the viewpoint that at least one of the degree of orientation and defect suppression is more excellent, a phenylene group is preferred. The number of carbon atoms of the heteroarylene group is not particularly limited, preferably 3 to 10, more preferably 3 to 5. Examples of the heteroatom contained in the heteroaryl group include an oxygen atom, a nitrogen atom, and a sulfur atom. Examples of the monovalent substituent include the groups shown in the item of "substituent" described later. Among them, a halogen atom, a hydroxyl group, or a cyano group is preferred.

[0050] R b12 represents a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms having a monovalent substituent, or a -CH 2 - which constitutes a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms which may have a monovalent substituent and is substituted with a divalent substituent (hereinafter, also referred to as "monovalent group B1"). Among them, from the viewpoint that at least one of the degree of orientation and defect suppression is more excellent, the monovalent group B1 is preferred. The monovalent aliphatic hydrocarbon group may be saturated or unsaturated, but is preferably saturated. The monovalent aliphatic hydrocarbon group may be linear, branched or cyclic, but is preferably linear or branched. The monovalent aliphatic hydrocarbon group is preferably an alkyl group in terms of better orientation. The number of carbon atoms of the monovalent aliphatic hydrocarbon group is 1 to 20, preferably 1 to 10, and particularly preferably 1 to 5, in terms of at least one of better orientation and less defect suppression. Examples of the monovalent substituent include the groups shown in the item "substituent" described below. Among them, a hydroxyl group, a halogen atom, a cyano group, or a sulfonic acid group is preferable. Specific examples of the divalent substituent include -O-, -C(=O)-, -N(R c2 )-, -S-, -C(=S)-, -S(=O)-, or a group formed by combining two or more of these groups. Among them, -O-, -C(=O)-, -N(R c2 )-, or a group formed by combining two or more of these groups is preferable in terms of at least one of better orientation and less defect suppression. Among them, the divalent substituent is preferably a group having an oxygen atom in terms of at least one of better orientation and less defect suppression. R c2 represents a hydrogen atom or an alkyl group, and a hydrogen atom is preferable. The number of carbon atoms of the alkyl group is not particularly limited, preferably 1 to 3, and particularly preferably 1. In the monovalent group B1, only one -CH 2 - constituting the monovalent aliphatic hydrocarbon group may be substituted with a divalent substituent, or two or more -CH 2 - may be substituted with a divalent substituent. Preferable embodiments of the monovalent group B1 include -alkylene group -O - C(=O)-alkyl group, -alkylene group -O - C(=O)-alkenyl group, -C(=O)-O-alkyl group, and -alkylene group -O - C(=O)-alkylene group - monovalent substituent.

[0051] R b11 、R b21 and R b22Each independently represents a hydrogen atom, a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms which may have a monovalent substituent, or a -CH that constitutes a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms which may have a monovalent substituent 2 - that is substituted with a divalent substituent (hereinafter also referred to as "monovalent group B2"). The monovalent aliphatic hydrocarbon group may be saturated or unsaturated, but is preferably saturated. The monovalent aliphatic hydrocarbon group may be linear, branched or cyclic, but is preferably linear or branched. The monovalent aliphatic hydrocarbon group is preferably an alkyl group in terms of better orientation. The number of carbon atoms of the monovalent aliphatic hydrocarbon group is 1 to 20, preferably 1 to 10, and particularly preferably 1 to 5 in terms of at least one of better orientation and less defect suppression. Examples of the monovalent substituent include the groups shown in the item of "substituent" described below. Among them, a hydroxyl group, a halogen atom, a cyano group, or a sulfonic acid group is preferable. Specific examples of the divalent substituent include -O-, -C(=O)-, -N(R c3 )-, -S-, -C(=S)-, -S(=O)-, or a group formed by combining two or more of these groups. Among them, in terms of at least one of better orientation and less defect suppression, -O-, -C(=O)-, -N(R c3 )-, or a group formed by combining two or more of these groups is preferable. Among them, the divalent substituent preferably has an oxygen atom-containing group in terms of at least one of better orientation and less defect suppression. R c3 represents a hydrogen atom or an alkyl group, and a hydrogen atom is preferable. The number of carbon atoms of the alkyl group is not particularly limited, preferably 1 to 3, and particularly preferably 1. In the monovalent group B2, only one -CH that constitutes the monovalent aliphatic hydrocarbon group 2 - may be substituted with a divalent substituent, or two or more -CH 2 - may be substituted with a divalent substituent. Preferred embodiments of the monovalent group B2 include: an alkylene group -O-C(=O)-alkyl group, an alkylene group -O-C(=O)-alkenyl group, a -C(=O)-O-alkyl group, and an alkylene group -O-C(=O)-alkylene group monovalent substituent.

[0052] R b11 From the viewpoint that at least one of the orientation degree and defect suppression is more excellent, a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms which may have a monovalent substituent is preferable, a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms (that is, a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms without a substituent) is preferable, and an alkyl group having 1 to 20 carbon atoms is preferable.

[0053] R b21 From the viewpoint that at least one of the orientation degree and defect suppression is more excellent, a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms which may have a monovalent substituent is preferable, a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms (that is, a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms without a substituent) is preferable, and an alkyl group having 1 to 20 carbon atoms is preferable.

[0054] R b22 From the viewpoint that at least one of the orientation degree and defect suppression is more excellent, a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms having a monovalent substituent or a monovalent group B2 is preferable.

[0055] na and nc each independently represent an integer of 0 to 3, an integer of 1 to 3 is preferable, an integer of 1 to 2 is more preferable, and 1 is particularly preferable. na + nc is 2 or more, 2 to 6 is preferable, 2 to 4 is more preferable, and 2 is particularly preferable.

[0056] In formula (C-1), the HSP value of R b12 is equal to or higher than the HSP value of R b11 and in formula (C-2), the HSP value of R b22 is equal to or higher than the HSP value of R b21 In the case where the HSP value of R b12 in formula (C-1) and Rb22 The absolute value of the difference in HSP value from [the other one] is preferably 3.0 or less, more preferably 1.0 or less, and particularly preferably 0.5 or less. If the absolute value of the difference in the above HSP value is 3.0 or less, the occurrence of defects can be further suppressed. Note that the HSP value means the Hansen solubility parameter. The lower limit value of the absolute value of the difference in the above HSP value is preferably 0 or more, more preferably 0.1 or more, and particularly preferably 0.2 or more from the viewpoint of achieving both high orientation degree and defect suppression. R b11 The HSP value of [R] is preferably from 11.0 to 20.0, and particularly preferably from 13.0 to 17.5. R b12 The HSP value of [R] is preferably from 15. to 28.0, and particularly preferably from 16.0 to 27.0. R b21 The HSP value of [R] is preferably from 11.0 to 20.0, and particularly preferably from 13.0 to 17.5. R b22 The HSP value of [R] is preferably from 13.0 to 28.0, and particularly preferably from 14.0 to 27.0. Here, for details of the HSP value (Hansen solubility parameter), there is an explanation in Hansen, Charles (2007). Hansen Solubility Parameters: A user’s handbook, Second Edition. Boca Raton, Fla: CRC Press. ISBN 9780849372483. The HSP value of each compound (each group) in the present invention is calculated by inputting the structural formula of the compound into the following software, and more specifically, it is the value corresponding to δtotal. As the software, HSPiP (Hansen Solubility Parameters in Practice) ver4.1.07 is used.

[0057] Specific examples of the dichroic substance C-1 and the dichroic substance C-2 are shown below, but are not limited thereto.

[0058]

Chemical formula

[0059] The total content of the dichroic substance C-1 and the dichroic substance C-2 is 4.5% by mass or more, preferably 6.5% by mass or more, particularly preferably 8.0% by mass or more, based on the total solid content mass of the liquid crystal composition, from the viewpoint of better alignment. The total content of the dichroic substance C-1 and the dichroic substance C-2 is preferably 40% by mass or less, particularly preferably 30% by mass or less, based on the total solid content mass of the liquid crystal composition, from the viewpoint of better alignment and / or less defect suppression. Preferably, the total content of the dichroic substance C-1 and the dichroic substance C-2 in the light absorption anisotropic film is the same as the total content of the dichroic substance C-1 and the dichroic substance C-2 based on the total solid content mass of the above-described liquid crystal composition.

[0060] In the liquid crystal composition, the mass ratio of the content of the dichroic substance C-1 to the content of the dichroic substance C-2 (content of the dichroic substance C-1 / content of the dichroic substance C-2) is preferably from 0.100 to 10.0, more preferably from 0.1100 to 4.50, particularly preferably from 0.100 to 3.5, from the viewpoint of better alignment and / or less defect suppression. Preferably, the mass ratio of the content of the dichroic substance C-1 to the content of the dichroic substance C-2 in the light absorption anisotropic film is the same as the mass ratio of the content of the dichroic substance C-1 to the content of the dichroic substance C-2 in the above-described liquid crystal composition.

[0061] <Other dichroic substances> The liquid crystal composition may contain other dichroic substances. Other dichroic substances mean dichroic substances other than the dichroic substance C-1 and the dichroic substance C-2, and specifically, they have a different chemical structure from the dichroic substance C-1 and the dichroic substance C-2. The other dichroic substances may or may not exhibit liquid crystallinity. When other dichroic substances exhibit liquid crystallinity, they may exhibit either nematic or smectic properties. The temperature range showing a liquid crystal phase is preferably from room temperature (about 20°C to 28°C) to 300°C, and more preferably from 50°C to 200°C from the viewpoints of handleability and manufacturing suitability. Other dichroic substances may be used alone or in combination of two or more.

[0062] Other dichroic substances are not particularly limited, and examples include visible light absorbing substances (dichroic dyes), light emitting substances (fluorescent substances, phosphorescent substances), ultraviolet absorbing substances, infrared absorbing substances, non-linear optical substances, carbon nanotubes, and inorganic substances (e.g., quantum rods), and conventionally known dichroic substances (dichroic dyes) can be used. Specifically, for example, paragraphs

[0067] to

[0071] of JP-A-2013-228706, paragraphs

[0008] to

[0026] of JP-A-2013-227532, paragraphs

[0008] to

[0015] of JP-A-2013-209367, paragraphs

[0045] to

[0058] of JP-A-2013-14883, paragraphs

[0012] to

[0029] of JP-A-2013-109090, paragraphs

[0009] to

[0017] of JP-A-2013-101328, paragraphs

[0051] to

[0065] of JP-A-2013-37353, paragraphs

[0049] to

[0073] of JP-A-2012-63387, paragraphs

[0016] to

[0018] of JP-A-11-305036, paragraphs

[0009] to

[0011] of JP-A-2001-133630, paragraphs

[0030] to

[0169] of JP-A-2011-215337, paragraphs

[0021] to

[0075] of JP-A-2010-106242, paragraphs

[0011] to

[0025] of JP-A-2010-215846, paragraphs

[0017] to

[0069] of JP-A-2011-048311, paragraphs

[0013] to

[0133] of JP-A-2011-213610, paragraphs

[0074] to

[0246] of JP-A-2011-237513, paragraphs

[0005] to

[0051] of JP-A-2016-006502, paragraphs

[0005] to

[0041] of WO2016 / 060173, paragraphs

[0008] to

[0062] of WO2016 / 136561, paragraphs

[0014] to

[0033] of WO2017 / 154835, paragraphs

[0014] to

[0033] of WO2017 / 154695, paragraphs

[0013] to

[0037] of WO2017 / 195833, paragraphs

[0014] to

[0034] of WO2018 / 164252, etc. can be mentioned.

[0063] When the liquid crystal composition contains another dichroic substance, the content of the other dichroic substance is preferably 0.2 to 20.0% by mass, particularly preferably 0.5 to 15.0% by mass, based on the total solid mass of the liquid crystal composition. When the light absorption anisotropic film contains other dichroic substances, the content of the other dichroic substances in the light absorption anisotropic film with respect to the total mass of the light absorption anisotropic film is preferably the same as the content of the other dichroic substances in the total solid content mass of the liquid crystal composition described above.

[0064] The light absorption anisotropic film of the present invention may have an array structure formed of a dichroic substance. Examples of the dichroic substance forming the array structure include the dichroic substance represented by the above formula (C-1), the dichroic substance represented by the above formula (C-2), and the above other dichroic substances. Among these dichroic substances, the dichroic substances forming the array structure may be single or plural. When the light absorption anisotropic film contains a plurality of dichroic substances, all types of the contained dichroic substances may form an array structure, or some types of the dichroic substances may form an array structure. Further, the above array structure may be an array structure composed of one dichroic substance or an array structure composed of a plurality of dichroic substances. The light absorption anisotropic film may have a plurality of different array structures. When there are a plurality of dichroic substances forming the array structure, the dichroic substances forming the array structure may be the same or different.

[0065] <Solvent> From the viewpoint of workability and the like, the liquid crystal composition preferably contains a solvent. Examples of the solvent include organic solvents such as ketones (e.g., acetone, 2-butanone, methyl isobutyl ketone, cyclopentanone, and cyclohexanone, etc.), ethers (e.g., dioxane, tetrahydrofuran, tetrahydropyran, dioxolane, tetrahydrofurfuryl alcohol, and cyclopentyl methyl ether, etc.), aliphatic hydrocarbons (e.g., hexane, etc.), alicyclic hydrocarbons (e.g., cyclohexane, etc.), aromatic hydrocarbons (e.g., benzene, toluene, xylene, and trimethylbenzene, etc.), halogenated carbons (e.g., dichloromethane, trichloromethane (chloroform), dichloroethane, dichlorobenzene, and chlorotoluene, etc.), esters (e.g., methyl acetate, ethyl acetate, and butyl acetate, diethyl carbonate, etc.), alcohols (e.g., ethanol, isopropanol, butanol, and cyclohexanol, etc.), cellosolves (e.g., methyl cellosolve, ethyl cellosolve, and 1,2-dimethoxyethane, etc.), cellosolve acetates, sulfoxides (e.g., dimethyl sulfoxide, etc.), amides (e.g., dimethylformamide, and dimethylacetamide, N-methylpyrrolidone, N-ethylpyrrolidone, 1,3-dimethyl-2-imidazolidinone, etc.), and heterocyclic compounds (e.g., pyridine, etc.), as well as water. These solvents may be used alone or in combination of two or more. Among these solvents, it is preferable to use an organic solvent, and more preferably a halogenated carbon or a ketone, for the reason that the effects of the present invention are more excellent.

[0066] When the liquid crystal composition contains a solvent, the content of the solvent is preferably 80 to 99% by mass, more preferably 83 to 97% by mass, and particularly preferably 85 to 95% by mass based on the total mass of the liquid crystal composition.

[0067] <Polymerization initiator> The liquid crystal composition preferably contains a polymerization initiator. The polymerization initiator to be used is preferably a photoinitiator capable of initiating a polymerization reaction by ultraviolet irradiation. Examples of the photoinitiator include α-carbonyl compounds (described in the specifications of U.S. Patent Nos. 2,367,661 and 2,367,670), acyloin ethers (described in the specification of U.S. Patent No. 2,448,828), α-hydrocarbon-substituted aromatic acyloin compounds (described in the specification of U.S. Patent No. 2,722,512), polynuclear quinone compounds (described in the specifications of U.S. Patent Nos. 3,046,127 and 2,951,758), a combination of a triarylimidazole dimer and p-aminophenyl ketone (described in the specification of U.S. Patent No. 3,549,367), acridine and phenazine compounds (described in JP-A-60-105667 and the specification of U.S. Patent No. 4,239,850), and oxadiazole compounds (described in the specification of U.S. Patent No. 4,212,970), acylphosphine oxide compounds (described in JP-B-63-40799, JP-B-5-29234, JP-A-10-95788, and JP-A-10-29997), and the like. In the present invention, it is also preferable that the polymerization initiator is an oxime-type polymerization initiator. Specific examples thereof include the initiators described in paragraphs

[0049] to

[0052] of International Publication No. 2017 / 170443. The polymerization initiator may be used alone or in combination of two or more.

[0068] When the liquid crystal composition contains a polymerization initiator, the content of the polymerization initiator is preferably 0.01 to 30 parts by mass, more preferably 0.1 to 15 parts by mass, based on 100 parts by mass in total of the dichroic substances (i.e., the total of dichroic substance C-1 and dichroic substance C-2, and other dichroic substances used as necessary) and the liquid crystalline compound in the liquid crystal composition. When the content of the polymerization initiator is 0.01 part by mass or more, the durability of the light absorption anisotropic film becomes good, and when it is 30 parts by mass or less, the degree of orientation of the light absorption anisotropic film becomes better.

[0069] <Interface improver> The liquid crystal composition preferably contains an interface improver. By containing the interface improver, the smoothness of the coating surface is improved, the alignment degree is improved, and repelling and unevenness are suppressed, and an improvement in in-plane uniformity is expected. As the interface improver, a fluorine (meth) acrylate polymer described in paragraphs

[0018] to

[0043] of JP-A-2007-272185 can be used. As the interface improver, other compounds may be used. The interface improver may be used alone or in combination of two or more. When the liquid crystal composition contains an interface improver, the content of the interface improver in the liquid crystal composition is preferably 0.1 to 2.0% by mass, more preferably 0.1 to 1.0% by mass, based on the total solid content mass of the liquid crystal composition. When the light absorption anisotropic film contains an interface improver, the content of the interface improver in the light absorption anisotropic film is preferably the same as the content of the interface improver in the total solid content mass of the liquid crystal composition.

[0070] <Vertical alignment agent> The liquid crystal composition preferably contains a vertical alignment agent from the viewpoint of facilitating the vertical alignment of the liquid crystalline compound and the dichroic substance. Examples of the vertical alignment agent include boronic acid compounds and onium salts. The vertical alignment agent may be used alone or in combination of two or more.

[0071] As the boronic acid compound, a compound represented by formula (30) is preferable.

[0072] Formula (30)

Chemical formula

[0073] In formula (30), R 1 and R 2 each independently represent a hydrogen atom, a substituted or unsubstituted aliphatic hydrocarbon group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group. R 3represents a substituent containing a (meth)acryl group. Specific examples of the boronic acid compound include the boronic acid compounds represented by the general formula (I) described in paragraphs 0023 to 0032 of JP-A-2008-225281. As the boronic acid compound, the compounds exemplified below are also preferable.

[0074] [Chemical formula]

[0075] As the onium salt, the compound represented by the formula (31) is preferable.

[0076] Formula (31) [Chemical formula]

[0077] In the formula (31), ring A represents a quaternary ammonium ion composed of a nitrogen-containing heterocyclic ring. X represents an anion. L1 represents a divalent linking group. L2 represents a single bond or a divalent linking group. Y1 represents a divalent linking group having a 5- or 6-membered ring as a partial structure. Z represents a divalent linking group having an alkylene group of 2 to 20 as a partial structure. P1 and P2 each independently represent a monovalent substituent having a polymerizable ethylenic unsaturated bond. Specific examples of the onium salt include the onium salts described in paragraphs 0052 to 0058 of JP-A-2012-208397, the onium salts described in paragraphs 0024 to 0055 of JP-A-2008-026730, and the onium salts described in JP-A-2002-37777.

[0078] When the liquid crystal composition contains a vertical alignment agent, the content of the vertical alignment agent in the liquid crystal composition is preferably 0.05 to 7.0% by mass, more preferably 0.1 to 5.0% by mass, based on the total solid mass of the liquid crystal composition. When the light absorption anisotropic film contains a vertical alignment agent, the content of the vertical alignment agent with respect to the total mass of the light absorption anisotropic film is preferably the same as the content of the vertical alignment agent with respect to the total solid content mass of the liquid crystal composition.

[0079] <Additive> The liquid crystal composition may contain components other than those described above. Examples of such components include additives such as a leveling agent, a polymerizable component, and a durability improver.

[0080] <Substituent> The substituents (monovalent substituents) in this specification mean the following groups unless otherwise specified. Examples of the substituent include an alkyl group (preferably an alkyl group having 1 to 20 carbon atoms, more preferably 1 to 12 carbon atoms, particularly preferably 1 to 8 carbon atoms, such as methyl group, ethyl group, isopropyl group, tert-butyl group, n-octyl group, n-decyl group, n-hexadecyl group, cyclopropyl group, cyclopentyl group, and cyclohexyl group), an alkenyl group (preferably an alkenyl group having 2 to 20 carbon atoms, more preferably 2 to 12 carbon atoms, particularly preferably 2 to 8 carbon atoms, such as vinyl group, aryl group, 2-butenyl group, and 3-pentenyl group), an alkynyl group (preferably an alkynyl group having 2 to 20 carbon atoms, more preferably 2 to 12 carbon atoms, particularly preferably 2 to 8 carbon atoms, such as propargyl group and 3-pentynyl group), an aryl group (preferably an aryl group having 6 to 30 carbon atoms, more preferably 6 to 20 carbon atoms, particularly preferably 6 to 12 carbon atoms, such as phenyl group, 2,6-diethylphenyl group, 3,5-ditrifluoromethylphenyl group, styryl group, naphthyl group, and biphenyl group), a substituted or unsubstituted amino group (preferably an amino group having 0 to 20 carbon atoms, more preferably 0 to 10 carbon atoms, particularly preferably 0 to 6 carbon atoms, such as unsubstituted amino group, methylamino group, dimethylamino group, diethylamino group, and anilino group), an alkoxy group (preferably having 1 to 20 carbon atoms, more preferably 1 to 15 carbon atoms, such as methoxy group, ethoxy group, and butoxy group), an oxycarbonyl group (preferably having 2 to 20 carbon atoms, more preferably 2 to 15 carbon atoms, particularly preferably 2 to 10 carbon atoms, such as methoxycarbonyl group, ethoxycarbonyl group, and phenoxycarbonyl group), an acyloxy group (preferably having 2 to 20 carbon atoms, more preferably 2 to 10 carbon atoms, particularly preferably 2 to 6 carbon atoms, such as acetoxy group, benzoyloxy group, acryloyl group, and methacryloyl group), an acylamino group (preferably having 2 to 20 carbon atoms, more preferably 2 to 10 carbon atoms, particularly preferably 2 to 6 carbon atoms, such as acetylamino group and benzoylamino group),An alkoxycarbonylamino group (preferably having 2 to 20 carbon atoms, more preferably 2 to 10 carbon atoms, particularly preferably 2 to 6 carbon atoms, and examples include a methoxycarbonylamino group), an aryloxycarbonylamino group (preferably having 7 to 20 carbon atoms, more preferably 7 to 16 carbon atoms, particularly preferably 7 to 12 carbon atoms, and examples include a phenyloxycarbonylamino group), a sulfonylamino group (preferably having 1 to 20 carbon atoms, more preferably 1 to 10 carbon atoms, particularly preferably 1 to 6 carbon atoms, and examples include a methanesulfonylamino group and a benzenesulfonylamino group), a sulfamoyl group (preferably having 0 to 20 carbon atoms, more preferably 0 to 10 carbon atoms, particularly preferably 0 to 6 carbon atoms, and examples include a sulfamoyl group, a methylsulfamoyl group, a dimethylsulfamoyl group, and a phenylsulfamoyl group), a carbamoyl group (preferably having 1 to 20 carbon atoms, more preferably 1 to 10 carbon atoms, particularly preferably 1 to 6 carbon atoms, and examples include an unsubstituted carbamoyl group, a methylcarbamoyl group, a diethylcarbamoyl group, and a phenylcarbamoyl group), an alkylthio group (preferably having 1 to 20 carbon atoms, more preferably 1 to 10 carbon atoms, particularly preferably 1 to 6 carbon atoms, and examples include a methylthio group and an ethylthio group), an arylthio group (preferably having 6 to 20 carbon atoms, more preferably 6 to 16 carbon atoms, particularly preferably 6 to 12 carbon atoms, and examples include a phenylthio group), a sulfonyl group (preferably having 1 to 20 carbon atoms, more preferably 1 to 10 carbon atoms, particularly preferably 1 to 6 carbon atoms, and examples include a mesyl group and a tosyl group), a sulfinyl group (preferably having 1 to 20 carbon atoms, more preferably 1 to 10 carbon atoms, particularly preferably 1 to 6 carbon atoms, and examples include a methanesulfinyl group and a benzenesulfinyl group), a ureido group (preferably having 1 to 20 carbon atoms, more preferably 1 to 10 carbon atoms, particularly preferably 1 to 6 carbon atoms, and examples include an unsubstituted ureido group, a methylureido group, and a phenylureido group), a phosphoric acid amide group (preferably having 1 to 20 carbon atoms, more preferably 1 to 10 carbon atoms, particularly preferably 1 to 6 carbon atoms, and examples includeExamples include diethylphosphoric acid amide group and phenylphosphoric acid amide group), hydroxy group, mercapto group, halogen atom (for example, fluorine atom, chlorine atom, bromine atom, and iodine atom), cyano group, nitro group, hydroxamic acid group, sulfino group, hydrazino group, imino group, azo group, heterocyclic group (preferably a heterocyclic group having 1 to 30 carbon atoms, more preferably 1 to 12 carbon atoms, for example, a heterocyclic group having a heteroatom such as a nitrogen atom, an oxygen atom, or a sulfur atom, and examples include epoxy group, oxetanyl group, imidazolyl group, pyridyl group, quinolyl group, furyl group, piperidyl group, morpholino group, maleimide group, benzoxazolyl group, benzimidazolyl group, and benzothiazolyl group), silyl group (preferably a silyl group having 3 to 40 carbon atoms, more preferably 3 to 30 carbon atoms, particularly preferably 3 to 24 carbon atoms, and examples include trimethylsilyl group and triphenylsilyl group), carboxy group, sulfonic acid group, and phosphoric acid group, etc.

[0081] Vertical alignment As described above, in the light absorption anisotropic film of the present invention, the liquid crystalline compound is vertically aligned. Further, in the light absorption anisotropic film of the present invention, it is preferable that the dichroic substance is also vertically aligned along the liquid crystalline compound. Here, vertical alignment means that the molecular axis of the liquid crystalline compound (for example, the long axis in the case of a rod-shaped liquid crystalline compound) is perpendicular to the main surface of the light absorption anisotropic film, but it does not require strict perpendicularity, and it means that the inclination angle formed by the average molecular axis of the liquid crystalline compound in the light absorption anisotropic film and the main surface of the light absorption anisotropic film is less than 90 ± 10 degrees. The above inclination angle can be measured using AxoScan OPMF-1 (manufactured by Optoscience). Specifically, using AxoScan OPMF-1 (manufactured by OptoSciences), at room temperature, the Mueller matrix of the photoabsorption anisotropic film at wavelength λ is measured every 10 degrees from a polar angle of -50 degrees to 50 degrees. After removing the influence of surface reflection, the attenuation coefficients ko[λ] (in-plane direction) and ke[λ] (thickness direction) are calculated by fitting the following theoretical formula considering Snell's law and Fresnel's law. Unless otherwise specified, the wavelength λ is 550 nm. k = -log(T) × λ / (4πd) Here, T represents the transmittance, and d represents the thickness of the photoabsorption anisotropic film. By calculating the absorbance and dichroic ratio in the in-plane direction and thickness direction from the calculated ko[λ] and ke[λ], it is possible to confirm whether the film is vertically aligned.

[0082] 〔Method for manufacturing photoabsorption anisotropic film〕 The method for manufacturing the photoabsorption anisotropic film of the present invention is not particularly limited. However, for the reason that the degree of orientation of the obtained photoabsorption anisotropic film is higher, a step of forming a coating film by applying the above-described liquid crystal composition on an alignment film (hereinafter, also referred to as the "coating film forming step") and a step of aligning the liquid crystal components contained in the coating film (hereinafter, also referred to as the "alignment step") are preferably provided in this order (hereinafter, also referred to as "this manufacturing method"). Note that the liquid crystal component is a component including not only the above-described liquid crystalline compound but also a dichroic substance having liquid crystallinity. Hereinafter, each step will be described.

[0083] <Coating film forming step> The coating film forming step is a step of forming a coating film by applying the above-described liquid crystal composition on an alignment film. The liquid crystalline compound in the coating film is vertically aligned by the interaction between the alignment film and (when the liquid crystal composition contains a vertical alignment agent) the vertical alignment agent. By using the above-described liquid crystal composition containing a solvent, or by using a liquid crystal composition made into a liquid material such as a melt by heating or the like, it becomes easy to apply the liquid crystal composition on the alignment film. As a method for applying the liquid crystal composition, known methods such as roll coating method, gravure printing method, spin coating method, wire bar coating method, extrusion coating method, direct gravure coating method, reverse gravure coating method, die coating method, spray method, and inkjet method can be mentioned.

[0084] (Alignment film) The alignment film may be any film as long as it can vertically align the liquid crystalline compound contained in the liquid crystal composition. It can be provided by means such as rubbing treatment of the film surface of an organic compound (preferably a polymer), oblique vapor deposition of an inorganic compound, formation of a layer having microgrooves, or accumulation of an organic compound (e.g., ω-tricosanoic acid, dioctadecyldimethylammonium chloride, methyl stearate) by the Langmuir-Blodgett method (LB film). Furthermore, an alignment film that generates an alignment function by applying an electric field, applying a magnetic field, or irradiating light is also known. Among them, in the present invention, from the viewpoint of easy control of the pretilt angle of the alignment film, an alignment film formed by rubbing treatment is preferable, and from the viewpoint of alignment uniformity, an optical alignment film formed by light irradiation is also preferable.

[0085] (1) Rubbing treatment alignment film As the polymer material used for the alignment film formed by rubbing treatment, there are descriptions in many documents, and a number of commercially available products can be obtained. In the present invention, polyvinyl alcohol or polyimide, and their derivatives are preferably used. For the alignment film, reference can be made to the description on pages 43, line 24 to page 49, line 8 of International Publication No. 2001 / 88574A1. The thickness of the alignment film is preferably 0.01 to 10 μm, and more preferably 0.01 to 1 μm.

[0086] (2) Optical alignment film As the photo-alignment material used for the alignment film formed by light irradiation, there are descriptions in many documents and the like. In the present invention, for example, azo compounds described in JP-A-2006-285197, JP-A-2007-76839, JP-A-2007-138138, JP-A-2007-94071, JP-A-2007-121721, JP-A-2007-140465, JP-A-2007-156439, JP-A-2007-133184, JP-A-2009-109831, Patent No. 3883848, Patent No. 4151746; aromatic ester compounds described in JP-A-2002-229039; maleimide and / or alkenyl-substituted nadimide compounds having a photo-alignment unit described in JP-A-2002-265541 and JP-A-2002-317013; photocrosslinkable silane derivatives described in Patent No. 4205195 and Patent No. 4205198; photocrosslinkable polyimide, polyamide or ester described in JP-T-2003-520878, JP-T-2004-529220 or Patent No. 4162850 are mentioned as preferred examples. More preferably, it is an azo compound, a photocrosslinkable polyimide, a polyamide or an ester.

[0087] The photo-alignment film is manufactured by irradiating the photo-alignment film formed from the above material with linearly polarized light or non-polarized light. In this specification, "linearly polarized light irradiation" and "non-polarized light irradiation" are operations for causing a photoreaction in the photo-alignment material. The wavelength of the light used varies depending on the photo-alignment material used and is not particularly limited as long as it is the wavelength required for the photoreaction. The peak wavelength of the light used for light irradiation is preferably 200 nm to 700 nm, and ultraviolet light with a peak wavelength of 400 nm or less is more preferable.

[0088] The light sources used for light irradiation can include commonly used light sources, such as lamps like tungsten lamps, halogen lamps, xenon lamps, xenon flash lamps, mercury lamps, mercury-xenon lamps, and carbon arc lamps, various lasers [e.g., semiconductor lasers, helium-neon lasers, argon ion lasers, helium cadmium lasers, and YAG (yttrium aluminum garnet) lasers], light-emitting diodes, and cathode ray tubes, etc.

[0089] As means for obtaining linearly polarized light, methods such as using a polarizing plate (e.g., an iodine polarizing plate, a dichroic substance polarizing plate, and a wire grid polarizing plate), using a prism-based element (e.g., a Glan-Taylor prism) or a reflective polarizer using Brewster's angle, or using light emitted from a laser light source having polarization can be adopted. Also, only light of a required wavelength may be selectively irradiated using a filter or a wavelength conversion element, etc.

[0090] When the irradiated light is linearly polarized, a method of irradiating light perpendicularly or obliquely to the surface of the alignment film from the upper surface or the back surface with respect to the alignment film is adopted. The incident angle of the light varies depending on the photo-alignment material, but is preferably 0 to 90° (perpendicular), and more preferably 40 to 90°. In the case of non-polarized light, non-polarized light is irradiated obliquely to the alignment film. The incident angle is preferably 10 to 80°, more preferably 20 to 60°, and particularly preferably 30 to 50°. The irradiation time is preferably 1 minute to 60 minutes, and more preferably 1 minute to 10 minutes.

[0091] When patterning is required, a method of performing light irradiation using a photomask the number of times required for pattern formation, or a method of writing a pattern by laser beam scanning can be adopted.

[0092] <Alignment process> The alignment step is a step of aligning the dichroic substance contained in the coating film. Thereby, the light absorption anisotropic film of the present invention is obtained. In the alignment step, it is considered that the dichroic substance is aligned along the liquid crystalline compound aligned by the alignment film. The alignment step may have a drying process. By the drying process, components such as a solvent can be removed from the coating film. The drying process may be performed by a method of leaving the coating film at room temperature for a predetermined time (for example, natural drying), or may be performed by a method of heating and / or blowing air. Here, the dichroic substance contained in the liquid crystal composition may be aligned by the above-described coating film forming step or drying process. For example, in an embodiment where the liquid crystal composition is prepared as a coating liquid containing a solvent, by drying the coating film and removing the solvent from the coating film, the dichroic substance contained in the coating film may be aligned, and the light absorption anisotropic film of the present invention may be obtained.

[0093] The alignment step preferably has a heat treatment. Thereby, the dichroic substance contained in the coating film is more aligned, and the degree of alignment of the obtained light absorption anisotropic film becomes higher. The heat treatment is preferably 10 to 250°C, more preferably 25 to 190°C, from the viewpoint of production suitability and the like. Also, the heating time is preferably 1 to 300 seconds, more preferably 1 to 60 seconds.

[0094] The alignment step may have a cooling process performed after the heat treatment. The cooling process is a process of cooling the coating film after heating to about room temperature (20 to 25°C). Thereby, the alignment of the dichroic substance contained in the coating film is more fixed, and the degree of alignment of the obtained light absorption anisotropic film becomes higher. The cooling means is not particularly limited and can be implemented by a known method. By the above steps, the light absorption anisotropic film of the present invention can be obtained.

[0095] 〔Other steps〕 This production method may have a step of curing the light absorption anisotropic film (hereinafter, also referred to as the "curing step") after the above alignment step. The curing process is carried out, for example, by heating and / or light irradiation (exposure). Among these, it is preferable that the curing process is carried out by light irradiation. As the light source used for curing, various light sources such as infrared rays, visible light, or ultraviolet rays can be used, but ultraviolet rays are preferable. Also, ultraviolet rays may be irradiated while heating during curing, or ultraviolet rays may be irradiated through a filter that transmits only a specific wavelength. Also, the exposure may be carried out in a nitrogen atmosphere. When the curing of the photoabsorptive anisotropic film proceeds by radical polymerization, it is preferable to carry out the exposure in a nitrogen atmosphere because the inhibition of polymerization by oxygen is reduced.

[0096] [Optical Film] The optical film of the present invention has a transparent film substrate and the above-described photoabsorptive anisotropic film disposed on the transparent film substrate. Also, the optical film of the present invention may have an alignment film between the transparent film substrate and the photoabsorptive anisotropic film. Also, the optical film of the present invention may further have a polarizer having an absorption axis in the plane. The polarizer is preferably disposed on the side opposite to the transparent substrate film of the photoabsorptive anisotropic film. The polarizer may be disposed so as to be in contact with the surface of the optically anisotropic film, or may be disposed on the surface of the optically anisotropic film via another layer (for example, a known adhesive layer or adhesive layer). When the optical film of the present invention has the above polarizer, the optical film of the present invention is preferably a viewing angle control film used for controlling the viewing angle. Hereinafter, each member constituting the optical film of the present invention will be described.

[0097] [Transparent Film Substrate] As the transparent film base material, known transparent resin films, transparent resin plates, transparent resin sheets, etc. can be used, and there is no particular limitation. As the transparent resin film, cellulose acetate film (for example, cellulose triacetate film (refractive index 1.48), cellulose diacetate film, cellulose acetate butyrate film, cellulose acetate propionate film), polyethylene terephthalate film, polyethersulfone film, polyacrylic resin film, polyurethane resin film, polyester film, polycarbonate film, polysulfone film, polyether film, polymethylpentene film, polyether ketone film, (meth)acrylonitrile film, etc. can be used.

[0098] Among them, a cellulose acetate film having high transparency, little optical birefringence, being easy to manufacture, and generally used as a protective film for a polarizing plate is preferable, and a cellulose triacetate film is particularly preferable. The thickness of the transparent film base material is usually 20 μm to 100 μm. In the present invention, it is particularly preferable that the transparent film base material is a cellulose ester-based film and its film thickness is 20 to 70 μm.

[0099] 〔Light absorption anisotropic film〕 Regarding the light absorption anisotropic film (light absorption anisotropic layer) of the present invention, as described above, the description thereof will be omitted.

[0100] 〔Alignment film〕 Regarding the alignment film (alignment layer), as described above, the description thereof will be omitted.

[0101] 〔Barrier layer〕 The optical film of the present invention preferably has a barrier layer together with the transparent film base material and the light absorption anisotropic layer. Here, the barrier layer is also called a gas barrier layer (oxygen barrier layer), and has a function of protecting the polarizing element of the present invention from gases such as oxygen in the atmosphere, moisture, or compounds contained in adjacent layers. Regarding the barrier layer, for example, refer to the descriptions in paragraphs

[0014] to

[0054] of JP-A-2014-159124, paragraphs

[0042] to

[0075] of JP-A-2017-121721, paragraphs

[0045] to

[0054] of JP-A-2017-115076, paragraphs

[0010] to

[0061] of JP-A-2012-213938, and paragraphs

[0021] to

[0031] of JP-A-2005-169994.

[0102] [Tone adjustment layer] The optical film of the present invention preferably includes a tone adjustment layer containing at least one kind of dye compound. The dye compound contained in the tone adjustment layer is preferably in an unoriented state. When adjusting the amount of the dye in the light absorption anisotropic layer, the change in tone seen from an oblique direction with respect to the center axis of the transmittance becomes large. However, by adjusting the tone using the tone adjustment layer, it is possible to suppress the change in tone from an oblique direction with respect to the change in tone of the center axis of the transmittance. This tone adjustment layer may have only the function of the tone adjustment layer alone, or may be one in which the functions are integrated with other layers.

[0103] The absorption peak wavelength of the dye compound contained in the tone adjustment layer used in the present invention is preferably 500 nm or more and 650 nm or less, more preferably 550 nm or more and 600 nm or less. By setting the absorption of the dye compound within this range, the tone of the optical film in the present invention can be adjusted to be more neutral.

[0104] Examples of the dye compound contained in the tone adjustment layer include azo, methine, anthraquinone, triarylmethane, oxazine, azomethine, phthalocyanine, porphyrin, perylene, pyrrolopyrrole, squarylium, etc. From the viewpoints of excellent absorption waveform, heat resistance, and light resistance, azo, phthalocyanine, and anthraquinone are preferred, and anthraquinone is particularly preferred. Examples include dye compounds described in Nobuyuki Okawara, Ken Matsuoka, Tsuneaki Hirasima, Teijiro Kitao, Functional Dyes, Kodansha, 1992, supervised by Sumio Tokita, Electronic Related Materials, CMC Publishing Co., Ltd., 1998.

[0105] Specific examples of the dye compounds used in the present invention are shown below, but the present invention is not particularly limited thereto. In the following formulas, Me represents a methyl group, Et represents an ethyl group, n-Bu represents a normal butyl group, Bn represents a benzyl group, and Ph represents a phenyl group.

[0106] Anthraquinone

Chemical formula

[0107] Azo

Chemical formula

[0108] Triarylmethane

Chemical formula

[0109] Oxazine

Chemical formula

[0110] Phthalocyanine

Chemical formula

[0111] 〔Polarizer〕 The polarizer used in the present invention is not particularly limited as long as it has an absorption axis in the plane and has a function of converting light into specific linearly polarized light, and a conventionally known polarizer can be used. As the polarizer, an iodine-based polarizer, a dye-based polarizer using a dichroic dye, a polyene-based polarizer, etc. are used. The iodine-based polarizer and the dye-based polarizer include a coating type polarizer and a stretched type polarizer, and either can be applied. As the polarizer, a polarizer in which a dichroic organic dye is oriented using the orientation of a liquid crystal compound is preferable. As the stretched polarizer, a polarizer produced by adsorbing iodine or a dichroic dye to polyvinyl alcohol and stretching it is preferable. For example, a light absorption anisotropic layer containing a dichroic dye compound that does not contain a liquid crystalline compound described in JP-A No. 2010-152351 and is horizontally oriented (a direction intersecting the thickness direction of the light absorption anisotropic film), and a light absorption anisotropic layer containing a liquid crystalline compound and a horizontally oriented dichroic dye compound described in WO 2017 / 154907 can be mentioned. In addition, as a method for obtaining a polarizer by performing stretching and dyeing in the state of a laminated film in which a polyvinyl alcohol layer is formed on a substrate, Patent No. 5048120, Patent No. 5143918, Patent No. 5048120, Patent No. 4691205, Patent No. 4751481, and Patent No. 4751486 can be mentioned, and known techniques related to these polarizers can also be preferably used. Here, horizontal orientation means that the molecular axis of the liquid crystalline compound or the dichroic dye compound (for example, the long axis in the case of a rod-shaped liquid crystalline compound) is parallel to the main plane of the polarizer, but it does not require strict parallelism, and the inclination angle formed by the average molecular axis of the liquid crystalline compound or the dichroic dye compound in the polarizer and the main plane of the polarizer is less than ±10 degrees. The above inclination angle can be measured using AxoScan OPMF-1 (manufactured by OptoSciences). Specifically, using AxoScan OPMF-1 (manufactured by OptoSciences), at room temperature, the Mueller matrix of the polarizer at a wavelength λ is measured every 10 degrees from a polar angle of -50 degrees to 50 degrees. After removing the influence of surface reflection, the attenuation coefficient ko[λ] (in-plane direction) and ke[λ] (thickness direction) are calculated by fitting the following theoretical formula considering Snell's law and Fresnel's law. When not otherwise specified, the wavelength λ is 550 nm. k = -log(T) × λ / (4πd) Here, T represents the transmittance, and d represents the thickness of the polarizer. By calculating the absorbance and dichroic ratio in the in-plane direction and thickness direction from the calculated ko[λ] and ke[λ], it is possible to confirm whether the film is horizontally oriented or not.

[0112] 〔Use〕 The optical film of the present invention is preferably used for preventing peeping and controlling the viewing angle range of a display device, although not limited thereto.

[0113] [Display device] The display device (image display device) of the present invention includes the above-described optical film having a polarizer and a display element. The display element is preferably disposed on the polarizer side of the optical film (i.e., the side opposite to the transparent film substrate). The polarizer and the liquid crystal cell may be laminated via a known adhesive layer or adhesive layer. The display element used in the display device of the present invention is not particularly limited, and examples thereof include a liquid crystal cell, an organic electroluminescence (hereinafter abbreviated as "EL") display panel, and a plasma display panel. Among these, a liquid crystal cell or an organic EL display panel is preferable. That is, as the display device of the present invention, a liquid crystal display device using a liquid crystal cell as a display element and an organic EL display device using an organic EL display panel as a display element are preferable. Some image display devices are thin and can be formed into a curved surface. Since the optically anisotropic absorption film used in the present invention is thin and easily bent, it can be suitably applied to an image display device having a curved display surface. In addition, some image display devices have a pixel density exceeding 250 ppi and can perform high-definition display. The optically anisotropic absorption film used in the present invention can be suitably applied to such a high-definition image display device without generating moire.

[0114] 〔Liquid crystal display device〕 As an example of the liquid crystal display device which is an example of the display device of the present invention, an embodiment having the above-described optical film having a polarizer and a liquid crystal cell is preferably mentioned. As a specific configuration, there is a configuration in which the optical film of the present invention is disposed on the front polarizing plate or the rear polarizing plate. In these configurations, it is possible to control the viewing angle in which the vertical direction or the horizontal direction is shielded from light. Alternatively, the optical film of the present invention may be disposed on both of the front polarizing plate and the rear polarizing plate. By adopting such a configuration, it is possible to control the viewing angle in which light is shielded in all directions and only light in the front direction is transmitted. Furthermore, a plurality of the optical films of the present invention may be laminated via a retardation layer. By controlling the retardation value and the optical axis direction, it is possible to control the transmission performance and the light shielding performance. For example, by arranging a polarizer, an optical film, a λ / 2 wave plate (the axis angle is deviated by 45° with respect to the alignment direction of the polarizer), and an optical film, it is possible to control the viewing angle in which light is shielded in all directions and only light in the front direction is transmitted. As the retardation layer, a positive A plate, a negative A plate, a positive C plate, a negative C plate, a B plate, an O plate, etc. can be used. From the viewpoint of thinning the viewing angle control system, the thickness of the retardation layer is preferably thin as long as it does not impair the optical characteristics, mechanical physical properties, and manufacturing suitability. Specifically, 1 to 150 μm is preferable, 1 to 70 μm is more preferable, and 1 to 30 μm is even more preferable. Hereinafter, the liquid crystal cell constituting the liquid crystal display device will be described in detail.

[0115] <Liquid crystal cell> The liquid crystal cell used in the liquid crystal display device is preferably a VA (Vertical Alignment) mode, an OCB (Optically Compensated Bend) mode, an IPS (In-Plane-Switching) mode, or a TN (Twisted Nematic) mode, but is not limited thereto. In the liquid crystal cell of the TN mode, rod-shaped liquid crystalline molecules are substantially horizontally aligned and further twisted and aligned by 60 to 120°. The liquid crystal cell of the TN mode is most widely used as a color TFT liquid crystal display device and is described in a number of documents. In a liquid crystal cell in the VA mode, rod-shaped liquid crystalline molecules are substantially vertically aligned when no voltage is applied. The liquid crystal cells in the VA mode include (1) a liquid crystal cell in the narrow sense of the VA mode (described in Japanese Patent Application Laid-Open No. 2-176625) that aligns rod-shaped liquid crystalline molecules substantially vertically when no voltage is applied and substantially horizontally when a voltage is applied, in addition to (2) a liquid crystal cell (in the MVA mode) in which the VA mode is made multi-domain for widening the viewing angle (described in SID97, Digest of tech.Papers (preliminary collection) 28 (1997) 845), (3) a liquid crystal cell in the mode (n-ASM mode) that aligns rod-shaped liquid crystalline molecules substantially vertically when no voltage is applied and in a twisted multi-domain alignment when a voltage is applied (described in the proceedings of the Japanese Liquid Crystal Symposium 58-59 (1998)), and (4) a liquid crystal cell in the SURVIVAL mode (presented at LCD International 98). Also, it may be any of PVA (Patterned Vertical Alignment) type, optical alignment type, and PSA (Polymer-Sustained Alignment). Details of these modes are described in detail in Japanese Patent Application Laid-Open No. 2006-215326 and Japanese Patent Publication No. 2008-538819.

[0116] In a liquid crystal cell in the IPS mode, a liquid crystalline compound is substantially parallel to the substrate, and when an electric field parallel to the substrate surface is applied, the liquid crystal molecules respond planar. That is, in the state where no electric field is applied, the liquid crystalline compound is aligned in the plane. The IPS mode is black display in the state where no electric field is applied, and the absorption axes of the pair of upper and lower polarizing plates are orthogonal. Methods for reducing the leakage light during black display in the diagonal direction and improving the viewing angle by using an optical compensation sheet are disclosed in Japanese Patent Application Laid-Open No. 10-54982, Japanese Patent Application Laid-Open No. 11-202323, Japanese Patent Application Laid-Open No. 9-292522, Japanese Patent Application Laid-Open No. 11-133408, Japanese Patent Application Laid-Open No. 11-305217, Japanese Patent Application Laid-Open No. 10-307291, etc.

[0117] ​As an example of the display device of the present invention, an organic EL display device, for example, a mode having, in this order from the viewing side, the optical film having the above-described polarizer, a λ / 4 plate, and an organic EL display panel is preferably cited. Also, similar to the above-described liquid crystal display device, the optical film of the present invention may be laminated in a plurality of layers via a retardation layer and disposed on the organic EL display panel. By controlling the retardation value and the optical axis direction, the transmission performance and the light shielding performance can be controlled. The organic EL display panel is a display panel configured using an organic EL element in which an organic light emitting layer (organic electroluminescence layer) is sandwiched between electrodes (between a cathode and an anode). The configuration of the organic EL display panel is not particularly limited, and a known configuration is adopted.

Example

[0118] Hereinafter, the present invention will be described in more detail based on examples. Materials, amounts used, ratios, processing contents, processing procedures, etc. shown in the following examples can be appropriately changed without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the examples shown below.

[0119] [Example 1] The optical film A of Example 1 was manufactured as follows.

[0120] [Formation of alignment film] The surface of a cellulose acetate film (TAC substrate with a thickness of 40 μm; TG40, manufactured by Fuji Film Co., Ltd.) was saponified with an alkaline solution, and Composition 1 for forming an alignment film was applied thereon with a wire bar. The support on which the coating film was formed was dried with warm air at 60°C for 60 seconds and further with warm air at 100°C for 120 seconds to form an alignment film 1, and a TAC film 1 with an alignment film was obtained. The film thickness of the alignment film was 1 μm.

[0121] ――――――――――――――――――――――――――――――――― [Composition 1 for forming alignment film] ――――――――――――――――――――――――――――――――― · Modified polyvinyl alcohol PVA-1 3.80 parts by mass · IRGACURE2959 0.20 parts by mass · Water 70 parts by mass · Methanol 30 parts by mass ―――――――――――――――――――――――――――――――――

[0122] Modified polyvinyl alcohol PVA-1

Chemical formula

[0123] 〔Preparation of the light absorption anisotropic film 1〕 The following liquid crystal composition 1 was continuously coated on the obtained alignment film 1 with a wire bar, heated at 120 °C for 60 seconds, and then cooled until it reached room temperature (23 °C). Next, it was heated at 80 °C for 60 seconds and cooled again until it reached room temperature. Thereafter, by irradiating for 2 seconds under the irradiation conditions of an illuminance of 200 mW / cm 2 using an LED (light emitting diode) lamp (center wavelength 365 nm), the light absorption anisotropic film 1 was prepared on the alignment film 1. The film thickness of the light absorption anisotropic film 1 was 3.5 μm. In this way, an optical film A in which the light absorption anisotropic film 1 was laminated on the alignment film 1 of the TAC film 1 with an alignment film was obtained. ――――――――――――――――――――――――――――――――― Composition of liquid crystal composition 1 ――――――――――――――――――――――――――――――――― · The following polymer liquid crystalline compound L1 6.704 parts by mass · The following low-molecular liquid crystalline compound L2 4.052 parts by mass · The following dichroic substance Y1 0.650 parts by mass · The following dichroic substance M1 0.148 parts by mass · The following dichroic substance C1 0.805 parts by mass · The following dichroic substance C2 0.130 parts by mass · 0.004 parts by mass of the following interface improver B1 · 0.156 parts by mass of the following vertical alignment agent B2 · 0.156 parts by mass of the following vertical alignment agent B3 · Polymerization initiator (IRGACURE OXE-02, manufactured by BASF) 0.195 parts by mass · Cyclopentanone (solvent) 87.000 parts by mass ―――――――――――――――――――――――――――――――――

[0124]

Chemical formula

[0125]

Chemical formula

[0126]

Chemical formula

[0127]

Chemical formula

[0128]

Chemical formula

[0129]

Chemical formula

[0130]

Chemical formula

[0131]

Chemical formula

[0132] [Examples 2 to 12, Comparative Examples 1 to 4] Except for changing the alignment film and liquid crystal composition to the alignment film and liquid crystal composition having the compositions described in Table 1 below, each of the optical films of Examples 2 to 12 and Comparative Examples 1 to 4 was produced in the same manner as the optical film A of Example 1.

[0133] An outline of the components contained in the liquid crystal compositions used for producing each of the optical films of the examples and comparative examples is shown below.

[0134] <Formation of Alignment Film 2> Composition for forming an alignment film 2 below was continuously applied onto a cellulose acylate film (TAC substrate with a thickness of 40 μm; TG40, manufactured by Fuji Film Co., Ltd.) with a wire bar. The support on which the coating film was formed was dried with warm air at 140 °C for 120 seconds to form an alignment film 2, and a TAC film 2 with an alignment film was obtained. The film thickness of the alignment film 2 was 0.5 μm.

[0135] ――――――――――――――――――――――――――――――――― (Composition for forming an alignment film 2) ――――――――――――――――――――――――――――――――― · 100.00 parts by mass of the following polymer PA2 · 8.25 parts by mass of the following acid generator PAG-1 · 0.6 part by mass of the following stabilizer DIPEA · 250.36 parts by volume of methyl ethyl ketone · 1001.42 parts by mass of butyl acetate ―――――――――――――――――――――――――――――――――

[0136]

Chemical formula

[0137] Polymeric liquid crystalline compound (following structure)

Chem.

[0138] Low molecular weight liquid crystalline compound (following structure)

Chem.

[0139] Dichroic substance Y (following structure)

Chem.

[0140] Dichroic substance M (following structure)

Chem.

[0141] Dichroic substances C-1 and C-2 (following structure)

Chem.

[0142] Here, in the chemical formulas of the dichroic substances corresponding to the above-mentioned dichroic substances C-1 and C-2, the groups within the dotted-line frames represent the groups corresponding to R in formula (C-1) and the groups corresponding to R in formula (C-2). b12 and b22 respectively.

[0143] Interface improver B1 (above structure) Vertical alignment agent B2 (above structure) Vertical alignment agent B3 (above structure)

[0144] Interface improver B4 (following structure) [Chemical formula]

[0145] Polymerization initiator (IRGACURE OXE-02, manufactured by BASF) Cyclopentanone (solvent)

[0146] [Evaluation test] Using each of the optical films of the examples and comparative examples obtained as described above, the following evaluations were carried out. Regarding the photoabsorption anisotropic film contained in the optical film of each example, when evaluated according to the above-described evaluation method for vertical alignment, in all of the photoabsorption anisotropic films contained in the optical films of the examples, the polymer liquid crystalline compound and the dichroic substance were vertically aligned.

[0147] [Degree of alignment] Using each of the optical films of the examples and comparative examples, in AxoScan OPMF-1 (manufactured by Optoscience), the Mueller matrix of the vertical polarization layer at wavelength λ was measured every 10 degrees from polar angle -50 degrees to 50 degrees. After removing the influence of surface reflection, ko[λ] and ke[λ] were calculated by fitting to the following theoretical formula considering Snell's law and Fresnel's law. k = -logP(T) × λ / (4πd) From the obtained ko[λ] and ke[λ], the absorbance and dichroic ratio in the in-plane direction and the film thickness direction were calculated, and finally the vertical alignment degree was determined. Based on the obtained vertical alignment degree, the alignment degree was evaluated according to the following evaluation criteria. The results are shown in Table 1 below. A: Vertical alignment degree is 0.965 or more B: Vertical alignment degree is less than 0.965 and 0.935 or more C: Vertical alignment degree is less than 0.935 and 0.90 or more D: Vertical alignment degree is less than 0.90

[0148] [Defects] The optical films of the examples and comparative examples were produced in the same manner as the production of the above-described optical film A, except that each liquid crystal composition used in the examples and comparative examples was heated at 45°C for 15 minutes and then allowed to stand at room temperature for 1 hour before use. One linear polarizer was inserted on each of the light source side and the objective lens side of an optical microscope (manufactured by Nikon Corporation, product name "ECLIPSE E600 POL") and arranged with a 90° shift. The above optical film was set on the sample stage, five locations were randomly selected from the set optical film, and observation was performed with a microscope at a 5-fold magnification of the objective lens. The average value of the number of defects at the five measured locations was calculated, and defect evaluation was performed according to the following evaluation criteria. The results are shown in Table 1 below. A: The average value of the number of defects is less than 2. B: The average value of the number of defects is 2 or more and less than 5. C: The average value of the number of defects is 5 or more and less than 10. D: The average value of the number of defects is 10 or more.

[0149] In Table 1, "HSP value difference" means the absolute value of the difference between the HSP value of the group corresponding to R in formula (C-1) and the HSP value of the group corresponding to R in formula (C-2). b12 and the HSP value of the group corresponding to R in formula (C-2). b22 means the absolute value of the difference. In Table 1, "total amount of C-1 and C-2" means the total content of the dichroic substance C-1 and the dichroic substance C-2 with respect to the total solid content mass of the liquid crystal composition.

[0150]

Table 1

[0151] As shown in Table 1, a light absorption anisotropic film formed from a liquid crystal composition containing a liquid crystalline compound, a dichroic substance C-1, and a dichroic substance C-2, in which the total content of the dichroic substance C-1 and the dichroic substance C-2 with respect to the total solid content mass of the liquid crystal composition is 4.5% by mass or more, and in which the liquid crystalline compound is vertically aligned, had few defects and showed a high degree of alignment (Examples 1 to 12). From the comparison between Example 2 and Example 5, it was shown that if the total content of the dichroic substance C-1 and the dichroic substance C-2 is 6.5% by mass or more based on the total solid mass of the liquid crystal composition (Example 2), the alignment degree is more excellent. From the comparison among Example 1, Example 2, and Example 7, R in the formula (C-2) b22 The group corresponding to is a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms with a monovalent substituent, or -CH that constitutes a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms which may have a monovalent substituent 2 When the dichroic substance C-2 in which - is a monovalent group substituted with a divalent substituent was used (Example 2), it was shown that the alignment degree and defect suppression were more excellent. From the comparison among Example 1, Example 2, Example 4, and Example 10, it was shown that if the HSP value difference is 3.0 or less (Example 2), at least one of the alignment degree and defect suppression is more excellent. From the comparison between Example 2 and Example 6, it was shown that if the mass ratio of the content of the dichroic substance C-1 to the content of the dichroic substance C-2 is 0.100 to 10.0 (Example 2), the alignment degree and defect suppression are more excellent. From the comparison between Example 2 and Example 9, it was shown that when the liquid crystalline compound contains a polymeric liquid crystalline compound (Example 2), the alignment degree is more excellent.

[0152] On the other hand, as shown in Table 1, when a liquid crystal composition containing only one of the dichroic substance C-1 and the dichroic substance C-2 was used (Comparative Example 1 and Comparative Example 2), or when the total content of the dichroic substance C-1 and the dichroic substance C-2 based on the total solid mass of the liquid crystal composition was less than 4.5% by mass (Comparative Example 3 and 4), it was shown that at least one of the alignment degree and defect suppression was inferior (Comparative Example).

[0153] [Example 13] [Formation of the color tone adjustment layer G1] The following color tone adjustment layer forming composition G1 was continuously applied onto the light absorption anisotropic film 1 obtained in Example 1 with a wire bar to form a coating film. Next, the support with the coating film formed thereon was dried with warm air at 60°C for 60 seconds and then with warm air at 100°C for 120 seconds to form the color tone adjustment layer G1, obtaining the optical film 1. The film thickness of the color tone adjustment layer was 0.5 μm. ――――――――――――――――――――――――――――――――― (Composition G1 for forming color tone adjustment layer) ――――――――――――――――――――――――――――――――― · 3.80 parts by mass of the above-mentioned modified polyvinyl alcohol PVA-1 · 0.20 parts by mass of IRGACURE2959 · 0.08 parts by mass of the pigment compound G-1 · 70 parts by mass of water · 30 parts by mass of methanol ―――――――――――――――――――――――――――――――――

[0154]

Chemical formula

[0155] <Fabrication of the optical laminate A1> A polarizing plate 1 with a thickness of 8 μm and one side of the polarizer exposed was fabricated in the same manner as the polarizing plate 02 with a single-sided protective film described in International Publication No. 2015 / 166991. The exposed surface of the polarizer of the polarizing plate 1 and the surface of the color tone adjustment layer of the fabricated optical film 1 were corona-treated and bonded using the following PVA adhesive 1 to fabricate the optical laminate A1.

[0156] (Preparation of PVA adhesive 1) To 100 parts of a polyvinyl alcohol-based resin containing an acetoacetyl group (average degree of polymerization: 1200, degree of saponification: 98.5 mol%, degree of acetoacetylation: 5 mol%), 20 parts of methylol melamine was dissolved in pure water under temperature conditions of 30°C to prepare an aqueous solution adjusted to a solid content concentration of 3.7%.

[0157] <Fabrication of the image display device A1> The iPad Air Wi-Fi model 16GB (manufactured by APPLE), which is an IPS-mode liquid crystal display device, was disassembled, and the liquid crystal cell was taken out. The viewing-side polarizing plate was peeled off from the liquid crystal cell, and the laminate A1 prepared above was adhered to the surface from which the viewing-side polarizing plate was peeled off using the following pressure-sensitive adhesive sheet 1 with the polarizing plate 1 side facing the liquid crystal cell side. At this time, the direction of the absorption axis of the polarizing plate 1 was adhered so as to be the same as that of the absorption axis of the viewing-side polarizing plate attached to the product. After adhesion, it was reassembled to produce the image display device A1.

[0158] (Preparation of pressure-sensitive adhesive sheet 1) An acrylate polymer was prepared according to the following procedure. 95 parts by weight of butyl acrylate and 5 parts by weight of acrylic acid were polymerized by solution polymerization in a reaction vessel equipped with a cooling pipe, a nitrogen introduction pipe, a thermometer, and a stirring device to obtain an acrylate polymer A1 having an average molecular weight of 2 million and a molecular weight distribution (Mw / Mn) of 3.0.

[0159] Next, to the obtained acrylate polymer A1 (100 parts by mass), Coronate L (75 mass% ethyl acetate solution of trimethylolpropane adduct of tolylene diisocyanate, number of isocyanate groups in one molecule: 3, manufactured by Nippon Polyurethane Industry Co., Ltd.) (1.0 part by mass) and silane coupling agent KBM-403 (manufactured by Shin-Etsu Chemical Co., Ltd.) (0.2 part by mass) were mixed, and finally ethyl acetate was added so that the total solid content concentration became 10 mass% to prepare a composition for forming a pressure-sensitive adhesive. This composition was applied to a separate film surface-treated with a silicone-based release agent using a die coater and dried in an environment at 90 °C for 1 minute to obtain an acrylate pressure-sensitive adhesive sheet. The film thickness was 25 μm, and the storage elastic modulus was 0.1 MPa.

[0160] When white display was performed using the image display device produced in Example 13, the color tones were neutral both from the front and obliquely.

Claims

1. A light absorption anisotropic film formed from a liquid crystal composition containing a liquid crystalline compound, a dichroic substance represented by formula (C-1), and a dichroic substance represented by formula (C-2), wherein the total content of the dichroic substance represented by formula (C-1) and the dichroic substance represented by formula (C-2) is 4.5% by mass or more based on the total solid content mass of the liquid crystal composition, and the liquid crystalline compound is vertically aligned. The light absorption anisotropic film. 【Chemical 1】 In Formula (C-1) and Formula (C-2), R ａ１ and R ａ２ each independently represents a hydrogen atom, a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms which may have a monovalent substituent, or a monovalent group in which -CH ２ - of a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms which may have a monovalent substituent is substituted with a divalent substituent. Ara and Arc each independently represent a divalent aromatic group which may have a monovalent substituent. R ｂ１１ and Rb21 are each independently a hydrogen atom, a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms which may have a monovalent substituent, or a -CH ２ - represents a monovalent group substituted with a divalent substituent. R ｂ１２ represents a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms with a monovalent substituent, or a monovalent group in which -CH ２ - is substituted with a divalent substituent and which is a constituent of a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms which may have a monovalent substituent. Rb22 represents a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms with a monovalent substituent, or a monovalent group in which -CH2- constituting the monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms which may have a monovalent substituent is substituted with a divalent substituent, and the monovalent aliphatic hydrocarbon group in Rb22 is a saturated aliphatic hydrocarbon group. na and nc each independently represent an integer of 0 to 3, and na + nc is 2 or more. However, when R ａ１ and R ａ２ are the same group, -N(R ｂ１１ )(R ｂ１２ ) and -N(R ｂ２１ )(R ｂ２２ ) are different groups. Also, when R ａ１ and R ａ２ are different groups, -N(R ｂ１１ )(R ｂ１２ ) and -N(R ｂ２１ )(R ｂ２２ ) may be the same group or different groups.

2. The light absorption anisotropic film according to claim 1, wherein the total content of the dichroic substance represented by formula (C-1) and the dichroic substance represented by formula (C-2) is 6.5% by mass or more based on the total solid content mass of the liquid crystal composition.

3. The light absorption anisotropic film according to claim 1 or 2, wherein in the liquid crystal composition, the mass ratio of the content of the dichroic substance represented by formula (C-1) to the content of the dichroic substance represented by formula (C-2) is 0.100 to 10.

0.

4. In the formula (C-1), R ｂ１２ has a Hansen solubility parameter value that is greater than or equal to the Hansen solubility parameter value of R ｂ１１ ​ In the formula (C-2), R ｂ２２ has a Hansen solubility parameter value that is greater than or equal to the Hansen solubility parameter value of R ｂ２１ ​ R in the formula (C-1) ｂ１２ and R in the formula (C-2) ｂ２２ The light absorption anisotropic film according to any one of claims 1 to 3, wherein the absolute value of the difference in Hansen solubility parameters between them is 3.0 or less.

5. R in the formula (C-1) ｂ１２ and R in the formula (C-2) ｂ２２ The photoabsorption anisotropic film according to claim 4, wherein the absolute value of the difference in Hansen solubility parameters between them is 1.0 or less.

6. R in the formula (C-1) above ｂ１２ wherein The monovalent substituent is a hydroxyl group, a halogen atom, a cyano group, or a sulfonic acid group. The divalent substituent is -O-, -C(=O)-, -N(R ｃ１ ), or a group formed by combining two or more of these groups, and R ｃ１ represents a hydrogen atom or an alkyl group. The photoabsorptive anisotropic film according to any one of claims 1 to 5.

7. The light absorption anisotropic film according to any one of claims 1 to 6, wherein the liquid crystalline compound includes a polymer liquid crystalline compound.

8. An optical film having a transparent film substrate and the light absorption anisotropic film according to any one of claims 1 to 7 disposed on the transparent film substrate.

9. The optical film according to claim 8, further having an alignment film between the transparent film substrate and the light absorption anisotropic film.

10. Furthermore, it has a polarizer having an absorption axis in the plane, and is used for controlling the viewing angle. The optical film according to claim 8 or 9.

11. A display device having the optical film according to claim 10 and a display element.

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