Elliptical polarizing plate

Abstract

To provide an elliptical polarizing plate in which an orientation defect and an optical axis shift are suppressed. In the elliptical polarizing plate of the present invention, an orientation layer A, a phase difference layer, an orientation layer B, and a polarizing layer are sequentially provided on a transparent substrate, the optical axis of the polarizing layer and the optical axis of the phase difference layer are not substantially in parallel, the phase difference layer is a film composed of a polymer of a polymerizable liquid crystal compound, the orientation layer B is a film having a thickness of 80 nm to 800 nm, and the polarizing layer is formed by orienting a dichroic dye in a film composed of a polymer of a polymerizable liquid crystal compound.

Description

[0001] This application is a divisional application of an application with the application number 201780044014.5, the filing date of July 10, 2017, and the title of "Elliptical Polarizing Plate". TECHNICAL FIELD

[0002] The present application relates to an elliptical polarizing plate. In addition, the present application also relates to a display device provided with the elliptical polarizing plate and a manufacturing method of the elliptical polarizing plate. BACKGROUND

[0003] In a flat panel display device (FPD), optical films such as a polarizing plate, a phase difference plate, and the like are used. As such a polarizing plate, a polarizing plate formed of a polarizing layer in which a dichroic dye such as iodine is oriented and adsorbed on a polyvinyl alcohol-based resin film and a protective film is widely used. As a phase difference plate, a phase difference plate obtained by stretching a cycloolefin-based resin film, a polycarbonate-based resin film, or a triacetyl cellulose-based resin film is well known. Along with thinning in recent years, a polarizing plate and a phase difference plate of a thin film manufactured by coating a composition containing a polymerizable liquid crystal compound on a substrate have been developed. For example, a phase difference film showing reverse wavelength dispersion is disclosed in Patent Literature 1, and a polarizing layer showing high polarizing performance is disclosed in Patent Literature 2. In addition, in order to further thin the film, a technology in which a polarizing layer and a phase difference film are formed via a protective layer is developed in Patent Literature 3. These polarizing layer and phase difference layer are often stacked with each other and used as an elliptical polarizing plate.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: Japanese Patent Application Laid-Open No. 2010-537955

[0007] Patent Literature 2: Japanese Patent Application Laid-Open No. 2013-101328

[0008] Patent Literature 3: Japanese Patent Application Laid-Open No. 2014-63143 SUMMARY

[0009] PROBLEMS TO BE SOLVED BY THE INVENTION

[0010] However, the conventional elliptical polarizing plate obtained as described above has a problem that orientation defects occur in the polarizing layer, and an optical axis shifts. For the orientation defects of the polarizing layer, the function as the elliptical polarizing plate is impaired at the defective portion. In addition, the optical axis shift impairs the function as the elliptical polarizing plate.

[0011] The present inventors have conducted research, and as a result, have found that a polarizing plate in which orientation defects and an optical axis shift are suppressed can be provided.

[0012] An object of the present application is to provide an elliptical polarizing plate in which orientation defects of a polarizing layer and optical axis misalignment are suppressed.

[0013] Means for solving the problem

[0014] That is, the present application provides the following [1] to

[13] .

[0015] [1] An elliptical polarizing plate which is an elliptical polarizing plate in which an orientation layer A, a phase difference layer, an orientation layer B, and a polarizing layer are sequentially provided on a transparent substrate,

[0016] The optical axis of the aforementioned polarizing layer and the aforementioned phase difference layer are not substantially in parallel relationship,

[0017] The aforementioned phase difference layer is a film composed of a polymer of a polymerizable liquid crystal compound,

[0018] The aforementioned orientation layer B is a film having a thickness of 80 nm to 800 nm,

[0019] The aforementioned polarizing layer is a film in which a dichroic dye is dispersed and oriented in a film composed of a polymer of a polymerizable liquid crystal compound.

[0020] [2] The elliptical polarizing plate according to [1], wherein the average refractive index of the aforementioned transparent substrate, orientation layer A, phase difference layer, orientation layer B, and polarizing layer is in the range of 1.4 to 1.7.

[0021] [3] The elliptical polarizing plate according to [1] or [2], wherein the refractive index difference of adjacent layers is 0.2 or less.

[0022] [4] The elliptical polarizing plate according to any one of [1] to [3], wherein the angle formed by the optical axis of the aforementioned polarizing layer and the phase difference layer is in the range of 40° to 50°.

[0023] [5] The elliptical polarizing plate according to any one of [1] to [4], wherein the aforementioned orientation layer A and orientation layer B are both photoalignment films.

[0024] [6] The elliptical polarizing plate according to any one of [1] to [5], wherein the aforementioned orientation layer A and orientation layer B are photoalignment films containing a cinnamoyl group.

[0025] [7] The elliptical polarizing plate according to any one of [1] to [6], wherein the aforementioned orientation layer A and orientation layer B are photoalignment films containing a resin having a weight average molecular weight of 20,000 to 50,000.

[0026] [8] The elliptical polarizing plate according to any one of [1] to [7], wherein the aforementioned polarizing layer is a film composed of a polymer of a smectic liquid crystal state.

[0027] [9] The elliptically polarizing plate according to any one of [1] to [8], wherein the dichroic dye is an azo dye.

[0028]

[10] The elliptically polarizing plate according to any one of [1] to [9], wherein the phase difference layer satisfies all of the following equations.

[0029] 100 nm < Re(550) < 160 nm... (1)

[0030] Re(450) / Re(550) < 1.0... (2)

[0031] 1.00 < Re(650) / Re(550)... (3)

[0032] (Re(450), Re(550), Re(650) each represent an in-plane retardation at a wavelength of 450 nm, 550 nm, and 650 nm, respectively.)

[0033]

[11] A liquid crystal display device comprising the elliptically polarizing plate according to any one of [1] to

[10] .

[0034]

[12] An organic EL display device comprising the elliptically polarizing plate according to any one of [1] to

[11] .

[0035]

[13] A method for producing an elliptically polarizing plate, comprising the following steps:

[0036] (1) a step of applying a composition containing an alignment material A and a solvent on a transparent substrate, drying, and then irradiating polarized UV light to form an alignment layer A;

[0037] (2) a step of applying a composition containing a polymerizable liquid crystal compound, a polymerization initiator, and a solvent on the alignment layer A, drying, and then irradiating UV light to polymerize in a liquid crystal state, thereby forming a phase difference layer;

[0038] (3) a step of applying a composition containing an alignment material B and a solvent, drying, and then irradiating polarized UV light to form an alignment layer B; and

[0039] (4) a step of applying a composition containing a polymerizable liquid crystal compound, a dichroic dye, a polymerization initiator, and a solvent on the alignment layer B, drying, and then irradiating UV light to polymerize in a liquid crystal state, thereby forming a polarizing layer.

[0040] Effects of the Invention

[0041] According to the present application, an elliptically polarizing plate in which the phase difference layer and the polarizing layer are inhibited from being shifted in optical axis and from having an alignment defect can be provided. DETAILED DESCRIPTION

[0042] Hereinafter, the embodiments of the present application will be described in detail. It should be noted that the scope of the present application is not limited to the embodiments described hereinafter, and various changes can be made thereto without departing from the spirit of the present application.

[0043] The elliptically polarizing plate of the present application is an elliptically polarizing plate in which an orientation layer A, a phase difference layer, an orientation layer B, and a polarizing layer are sequentially provided on a transparent substrate.

[0044] [Transparent substrate]

[0045] As the transparent substrate, a glass substrate and a film substrate can be given, and a film substrate is preferred, and a long, roll-shaped film is more preferred from the viewpoint of continuous production.

[0046] As the resin constituting the film substrate, for example, polyolefins such as polyethylene, polypropylene, norbornene-based polymers, cyclic olefin-based resins, polyvinyl alcohol, polyethylene terephthalate, polymethacrylate, polyacrylate, cellulose esters such as triacetyl cellulose, diacetyl cellulose, and cellulose acetate propionate, polyethylene naphthalate, polycarbonate, polysulfone, polyethersulfone, polyether ketone, polyphenylene sulfide, and polyphenylene ether, and the like can be given.

[0047] As the commercially available cellulose ester substrate, "Fujitack" (manufactured by Fuji Photo Film Co., Ltd.), "KC8UX2M", "KC8UY", and "KC4UY" (all manufactured by Konica Minolta Opto, Inc.), and the like can be given.

[0048] As the commercially available cyclic olefin-based resin, "Topas" (registered trademark) (manufactured by Ticona GmbH (Germany)), "ARTON" (registered trademark) (manufactured by JSR Corporation), "ZEONOR" (registered trademark), "ZEONEX" (registered trademark) (all manufactured by ZEON Corporation), and "APEL" (registered trademark) (manufactured by Mitsui Chemicals, Inc.) can be given. Such a cyclic olefin-based resin can be made into a film using known means such as solvent casting and melt extrusion, and used as a substrate. A commercially available cyclic olefin-based resin substrate can also be used. As the commercially available cyclic olefin-based resin substrate, "ESCENA" (registered trademark), "SCA40" (registered trademark) (both manufactured by Shimizu Chemical Co., Ltd.), "ZEONOR FILM" (registered trademark) (manufactured by OPTES Corporation), and "ARTON FILM" (registered trademark) (manufactured by JSR Corporation) can be given.

[0049] The thickness of the substrate is preferably thin from the viewpoint of ease of handling in practical applications, but if it is too thin, the strength decreases and there is a tendency for poor processability. The thickness of the substrate is usually 5 μm to 300 μm, and preferably 20 μm to 200 μm.

[0050] [Orientation layer A (orientation film for forming phase difference layer)]

[0051] On the transparent substrate, an orientation layer A is first formed. The orientation layer A (or orientation film A) is a layer having an orientation control force for orienting the polymerizable liquid crystal compound used in the formation of the phase difference layer in a desired direction.

[0052] As the orientation layer A, it is preferable to have solvent resistance that does not dissolve due to coating or the like of the liquid crystal compound described later, and heat resistance with respect to a heat treatment for removing the solvent and orienting the polymerizable liquid crystal compound described later. As the type of orientation film, rubbing orientation films, photo-orientation films, and grooved orientation films having a concave-convex pattern, a plurality of grooves on the surface, and the like can be given. In the case of applying to a long, roll-shaped film, a photo-orientation film that can cause orientation control by polarized light irradiation is preferable from the viewpoint of being able to easily control the orientation direction.

[0053] Such an orientation film makes the orientation of the polymerizable liquid crystal compound easy to proceed. In addition, various orientations such as horizontal orientation, hybrid orientation, and oblique orientation can be controlled by the type of orientation film, rubbing conditions, and light irradiation conditions.

[0054] As the orientation layer A used for forming the phase difference layer, the orientation film described in the orientation layer B described later can be used. The orientation layer B can be the same as or different from the orientation layer A.

[0055] The thickness of the orientation layer A is usually in the range of 10 to 10,000 nm (0.01 μm to 10 μm), preferably in the range of 80 to 800 nm (0.08 μm to 0.8 μm), and further preferably in the range of 100 to 500 nm (0.1 μm to 0.5 μm). By forming the orientation layer A in the above film thickness range, orientation defects can be suppressed.

[0056] [Phase difference layer]

[0057] The elliptical polarizing plate of the present application has a phase difference layer after the alignment layer A. For this phase difference layer, from the viewpoint of thinness and the ability to arbitrarily design the wavelength dispersion characteristics, it is preferable to coat a composition containing a polymerizable liquid crystal compound (hereinafter, also referred to as a phase difference layer-forming composition) on the alignment layer A to form a coated layer, to make the polymerizable liquid crystal compound in an oriented state in the coated layer, and to make it polymerize and cure in this state to make a layer formed of a polymer. In addition, the composition for forming the phase difference layer (hereinafter, referred to as a phase difference layer-forming composition) can further contain a solvent, a photopolymerization initiator, a photosensitizer, a polymerization inhibitor, a leveling agent, and an adhesion improver, and the like.

[0058] The phase difference layer in the elliptical polarizing plate of the present application can generally be formed by coating a phase difference layer-forming composition on the alignment layer A formed on a substrate and polymerizing the polymerizable liquid crystal compound contained in the above-mentioned optical anisotropic layer-forming composition. The phase difference layer is generally a film having a thickness of 5 μm or less obtained by curing the polymerizable liquid crystal compound in an oriented state, and is preferably a liquid crystal cured film obtained by curing the polymerizable liquid crystal compound in an oriented state in the horizontal direction with respect to the substrate surface.

[0059] For the phase difference layer obtained by curing the polymerizable liquid crystal compound in an oriented state in the horizontal direction with respect to the substrate surface, it is preferable that the in-plane phase difference with respect to light having a wavelength of λ nm, that is, R(λ) satisfies the optical characteristics represented by the following formula (1), and it is more preferable that the optical characteristics represented by the following formula (1), the following formula (2), and the following formula (3) are satisfied.

[0060] 100 nm < Re(550) < 160 nm... (1)

[0061] (In the formula, Re(550) represents the in-plane phase difference value (in-plane retardation) with respect to light having a wavelength of 550 nm.)

[0062] Re(450) / Re(550) ≤ 1.0... (2)

[0063] 1.00 ≤ Re(650) / Re(550)... (3)

[0064] (In the formula, Re(450) represents the in-plane phase difference value with respect to light having a wavelength of 450 nm, Re(550) represents the in-plane phase difference value with respect to light having a wavelength of 550 nm, and Re(650) represents the in-plane phase difference value with respect to light having a wavelength of 650 nm.)

[0065] When the "Re(450) / Re(550)" of the phase difference layer is greater than 1.0, the light leakage on the short wavelength side in the elliptically polarizing plate having the phase difference layer increases, and therefore, it is preferable to be 1.0 or less, more preferably 0.95 or less, and further preferably 0.92 or less.

[0066] The in-plane phase difference value of the phase difference layer can be adjusted by the thickness of the phase difference layer. The in-plane phase difference value is determined by the following formula (4), and therefore, in order to obtain a desired in-plane phase difference value (Re(λ)), Δn(λ) and the film thickness d are adjusted. The thickness of the phase difference layer is preferably 0.5 μm to 5 μm, and more preferably 1 μm to 3 μm. The thickness of the phase difference layer can be measured using an interference film thickness meter, a laser microscope, or a stylus type film thickness meter. Note that Δn(λ) depends on the molecular structure of the polymerizable liquid crystal compound described later.

[0067] Re(λ) = d x Δn(λ)... (4)

[0068] (In the formula, Re(λ) represents the in-plane phase difference value at a wavelength of λ nm, d represents the film thickness, and Δn(λ) represents the birefringence at a wavelength of λ nm.)

[0069] [Polymerizable liquid crystal compound for forming phase difference layer]

[0070] The polymerizable liquid crystal compound is a liquid crystal compound having a polymerizable functional group, particularly a photopolymerizable functional group. The photopolymerizable functional group is a group that can participate in a polymerization reaction by active radicals, acid, or the like generated from a photopolymerization initiator. As the photopolymerizable functional group, a vinyl group, a vinyloxy group, a 1-chlorovinyl group, an isopropenyl group, a 4-vinylphenyl group, an acryloyloxy group, a methacryloyloxy group, an oxiranyl group, an oxetanyl group, or the like can be given. Among them, an acryloyloxy group, a methacryloyloxy group, a vinyloxy group, an oxiranyl group, and an oxetanyl group are preferable, and an acryloyloxy group is more preferable. In terms of liquid crystallinity, it can be a thermotropic liquid crystal or a lyotropic liquid crystal, and a thermotropic liquid crystal is preferable in terms of being able to perform fine film thickness control. In addition, as the phase sequence structure in the thermotropic liquid crystal, a nematic phase structure or a smectic phase structure can be given.

[0071] In the present application, as the polymerizable liquid crystal compound for forming the phase difference layer, a compound having the structure of the following formula (I) is particularly preferable in terms of exhibiting the aforementioned reverse wavelength dispersion.

[0072]

[0073] In formula (I), Ar represents a divalent aromatic group, and at least one or more of a nitrogen atom, an oxygen atom, and a sulfur atom can be included in the divalent aromatic group.

[0074] G 1 and G 2 each independently represents a divalent aromatic group or a divalent alicyclic hydrocarbon group. Here, a hydrogen atom included in the divalent aromatic group or the divalent alicyclic hydrocarbon group can be substituted with a halogen atom, an alkyl group having 1 to 4 carbon atoms, a fluoroalkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a cyano group, or a nitro group, and a carbon atom constituting the divalent aromatic group or the divalent alicyclic hydrocarbon group can be replaced with an oxygen atom, a sulfur atom, or a nitrogen atom.

[0075] L 1 , L 2 , B 1 and B 2 each independently is a single bond or a divalent linking group.

[0076] k, 1 each independently represents an integer of 0 to 3, and satisfies a relationship of 1 < k + 1. Here, when 2 < k + 1, B 1 and B 2 , G 1 and G 2 may be the same as or different from each other.

[0077] E 1 and E 2 each independently represents an alkanediyl group having 1 to 17 carbon atoms, and here, a hydrogen atom included in the alkanediyl group can be substituted with a halogen atom, and -CH2- included in the alkanediyl group can be replaced with -0-, -Si-.

[0078] P 1 and P 2 independently of each other represent a polymerizable group or a hydrogen atom, and at least one is a polymerizable group.

[0079] G 1 and G 2 each independently is preferably a 1,4-phenyl group which can be substituted with at least one substituent selected from the group consisting of a halogen atom and an alkyl group having 1 to 4 carbon atoms, a 1,4-cyclohexyl group which can be substituted with at least one substituent selected from the group consisting of a halogen atom and an alkyl group having 1 to 4 carbon atoms, more preferably a 1,4-phenyl group substituted with a methyl group, an unsubstituted 1,4-phenyl group, or an unsubstituted 1,4-trans-cyclohexyl group, and particularly preferably an unsubstituted 1,4-phenyl group or an unsubstituted 1,4-trans-cyclohexyl group.

[0080] Further, it is preferable that a plurality of G 1 and G 2 at least one of which is a divalent alicyclic hydrocarbon group, and further more preferably, at least one of L 1 or L 2G 1 G 2 at least one of G

[0081] L 1 L 2 each independently is preferably a single bond, -O-, -CH2CH2-, -CH2O-, -COO-, -OCO-, -N=N-, -CR a =CR b -, or -C≡C-. Here, R a and R b represent an alkyl group having 1 to 4 carbon atoms or a hydrogen atom. L 1 and L 2 each independently is more preferably a single bond, -O-, -CH2CH2-, -COO-, or -OCO-.

[0082] B 1 B 2 each independently is preferably a single bond, -O-, -S-, -CH2O-, -COO-, or -OCO-, more preferably a single bond, -O-, -COO-, or -OCO-.

[0083] For k and 1, from the viewpoint of exhibiting reverse wavelength dispersion, it is preferable that 2 ≤ k + 1 ≤ 6, preferably k + 1 = 4, more preferably k = 2 and 1 = 2. When k = 2 and 1 = 2, a symmetrical structure is obtained, and thus it is preferable.

[0084] E 1 E 2 each independently is preferably an alkane diyl group having 1 to 17 carbon atoms, more preferably an alkane diyl group having 4 to 12 carbon atoms.

[0085] As the polymerizable group represented by P 1 or P 2 , an epoxy group, a vinyl group, a vinyloxy group, a 1-chlorovinyl group, an isopropenyl group, a 4-vinylphenyl group, an acryloyloxy group, a methacryloyloxy group, an oxiranyl group, and an oxetanyl group, etc. can be given.

[0086] Among them, an acryloyloxy group, a methacryloyloxy group, a vinyloxy group, an oxiranyl group, and an oxetanyl group are preferable, and an acryloyloxy group is more preferable.

[0087] Ar preferably has an aromatic heterocycle. As the aromatic heterocycle, a furan ring, a benzofuran ring, a pyrrole ring, a thiophene ring, a pyridine ring, a thiazole ring, a benzothiazole ring, a thienothiazole ring, an oxazole ring, a benzoxazole ring, and a phenanthroline ring, etc. can be given. Among them, a thiazole ring, a benzothiazole ring, or a benzofuran ring is preferable, and a benzothiazole group is more preferable.

[0088] In addition, when the nitrogen atom is contained in Ar, the nitrogen atom preferably has a π electron.

[0089] In formula (I), the total number N of π electrons contained in the 2-valent aromatic group represented by Ar π It is preferably 10 or more, more preferably 14 or more, and further preferably 18 or more. In addition, it is preferably 30 or less, more preferably 26 or less, and further preferably 24 or less.

[0090] As the aromatic group represented by Ar, for example, the following groups can be given.

[0091]

[0092] In formulae (Ar-1) to (Ar-20), the symbol * represents a bonding site, Z 0 , Z 1 , and Z 2 each independently represents a hydrogen atom, a halogen atom, an alkyl group having a carbon atom number of 1 to 12, a cyano group, a nitro group, an alkylsulfinyl group having a carbon atom number of 1 to 12, an alkylsulfonyl group having a carbon atom number of 1 to 12, a carboxyl group, a fluoroalkyl group having a carbon atom number of 1 to 12, an alkoxy group having a carbon atom number of 1 to 6, an alkylthio group having a carbon atom number of 1 to 12, an N-alkylamino group having a carbon atom number of 1 to 12, an N,N-dialkylamino group having a carbon atom number of 2 to 12, an N-alkylsulfamoyl group having a carbon atom number of 1 to 12, or an N,N-dialkylsulfamoyl group having a carbon atom number of 2 to 12.

[0093] Q 1 , Q 2 , and Q 3 each independently represents -CR 2 ' R 3 ', -S-, -NH-, -NR 2 ', -CO-, or -O-, R 2 ', and R 3 ' each independently represents a hydrogen atom or an alkyl group having a carbon atom number of 1 to 4.

[0094] Y 1 , Y 2 , and Y 3 each independently represents an aromatic hydrocarbon group or an aromatic heterocyclic group which can be substituted.

[0095] W 1 , and W 2 each independently represents a hydrogen atom, a cyano group, a methyl group, or a halogen atom, and m represents an integer of 0 to 6.

[0096] As Y 1 , Y 2 , and Y 3As the aromatic hydrocarbon group, there are, for example, aromatic hydrocarbon groups having 6 to 20 carbon atoms such as phenyl, naphthyl, anthryl, phenanthryl, and biphenyl, and preferably phenyl, naphthyl, and more preferably phenyl. As the aromatic heterocyclic group, there are, for example, aromatic heterocyclic groups having 4 to 20 carbon atoms which contain at least one hetero atom (nitrogen atom, oxygen atom, sulfur atom, etc.) such as furyl, pyrrolyl, thienyl, pyridyl, thiazolyl, benzothiazolyl, and preferably furyl, thienyl, pyridyl, thiazolyl, and benzothiazolyl.

[0097] Y 1 , Y 2 , and Y 3 Each independently can be a polycyclic ring aromatic hydrocarbon group or a polycyclic ring aromatic heterocyclic group which can be substituted. The polycyclic ring aromatic hydrocarbon group means a fused polycyclic ring aromatic hydrocarbon group or a group from a set of aromatic rings. The polycyclic ring aromatic heterocyclic group means a fused polycyclic ring aromatic heterocyclic group or a group from a set of aromatic rings.

[0098] Z 0 , Z 1 , and Z 2 Each independently is preferably a hydrogen atom, a halogen atom, an alkyl group having 1 to 12 carbon atoms, a cyano group, an alkoxy group having 1 to 12 carbon atoms, Z 0 is further preferably a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, a cyano group, Z 1 , and Z 2 is further preferably a hydrogen atom, a fluorine atom, a chlorine atom, a methyl group, a cyano group.

[0099] Q 1 , Q 2 , and Q 3 is preferably -NH-, -S-, -NR 2 ', -O-, R 2 ' is preferably a hydrogen atom. Among them, -S-, -O-, and -NH- are particularly preferable.

[0100] In formulae (Ar-1) to (Ar-20), from the viewpoint of stability of the molecule, formula (Ar-6) and formula (Ar-7) are preferable.

[0101] In formulae (Ar-14) to (Ar-20), Y 1 may form an aromatic heterocyclic group together with the nitrogen atom to which it is bonded and Z 0 . Examples thereof include a pyrrole ring, an imidazole ring, a pyrroline ring, a pyridine ring, a pyrazine ring, a pyrimidine ring, an indole ring, a quinoline ring, an isoquinoline ring, a purine ring, and a pyrrolidine ring. The aromatic heterocyclic group can have a substituent. Further, Y 1 may form an aromatic heterocyclic group together with the nitrogen atom to which it is bonded and Z 0together become the aforementioned substitutable polycyclic aromatic hydrocarbon group or polycyclic aromatic heterocyclic group.

[0102] The total content of the polymerizable liquid crystal compound in 100 parts by mass of the solid content of the aforementioned phase difference layer-forming composition is usually 70 to 99.5 parts by mass, preferably 80 to 99 parts by mass, and more preferably 80 to 94 parts by mass. When the total content is within the aforementioned range, there is a tendency that the alignment of the obtained phase difference layer is improved. Here, the solid content refers to the total amount of the components remaining after the solvent is removed from the composition.

[0103] [Alignment layer B (alignment film for forming a polarizing layer)]

[0104] The elliptical polarizing plate of the present application has an alignment layer B after the phase difference layer. The alignment layer B is an alignment film for forming a polarizing layer.

[0105] As the alignment layer B, it is preferable to have solvent resistance that does not dissolve due to coating or the like of the aforementioned polarizing layer-forming composition, and heat resistance with respect to the heating treatment for removing the solvent and aligning the aforementioned polymerizable liquid crystal compound. As the type of the alignment film, rubbing alignment film, photo-alignment film, and grooved alignment film having a concave-convex pattern, a plurality of grooves on the surface, and the like can be given. In the case of applying to a long roll-shaped film, from the viewpoint of being able to easily control the alignment direction, a photo-alignment film that can cause alignment control force by polarized light irradiation is preferable.

[0106] Such an alignment film makes it easy to align the polymerizable liquid crystal compound. In addition, various alignments such as horizontal alignment, mixed alignment, and oblique alignment can be controlled by the type of the alignment film, rubbing conditions, and light irradiation conditions.

[0107] The thickness of the alignment layer B is in the range of 80 to 800 nm (0.08 μm to 0.8 μm), preferably in the range of 100 to 500 nm (0.1 μm to 0.5 μm), and further preferably 150 nm (0.15 μm) or more. When the film thickness is less than the aforementioned range, the optical axis of the polarizing layer after the alignment layer B is sometimes deviated from the desired value due to the influence of the layer formed immediately below the alignment layer, that is, the phase difference layer or the like. On the other hand, when the film thickness is greater than the aforementioned range, the alignment control force is reduced, and sometimes alignment defects are generated in the polarizing layer.

[0108] As the alignment polymer usable for the rubbing alignment film, for example, a polyamide having an amide bond, a gelatin-based material, a polyimide having an imide bond and a hydrolyzate thereof, i.e., a polyamic acid, a polyvinyl alcohol, an alkyl-modified polyvinyl alcohol, a polyacrylamide, a polyoxazole, a polyvinylimine, a polystyrene, a polyvinylpyrrolidone, a polyacrylic acid, and a polyacrylate can be given. Among them, a polyvinyl alcohol is preferred. Two or more kinds of alignment polymers can be combined.

[0109] For the rubbing alignment film, generally, a composition in which an alignment polymer is dissolved in a solvent is applied to a substrate, the solvent is removed to form a coated film, and the coated film is rubbed to impart an alignment control force.

[0110] The concentration of the alignment polymer in the alignment polymer composition can be in a range in which the alignment polymer is completely dissolved in the solvent. The content of the alignment polymer with respect to the alignment polymer composition is preferably 0.1 to 20 mass%, and more preferably 0.1 to 10 mass%.

[0111] The alignment polymer composition is commercially available. As the commercially available alignment polymer composition, SUNEVER (registered trademark, manufactured by Nissan Chemical Industries, Ltd.), OPTMER (registered trademark, manufactured by JSR Corporation), and the like can be given.

[0112] As the method of applying the alignment polymer composition, the same method as the method of applying the composition for forming an optically anisotropic layer described later can be given. As the method of removing the solvent contained in the alignment polymer composition, a natural drying method, an air-drying method, a heating drying method, a reduced-pressure drying method, and the like can be given.

[0113] As the method of rubbing, for example, a method in which the aforementioned coated film is brought into contact with a rubbing roller on which a rubbing cloth is wound and is rotated can be given. When the rubbing treatment is performed, by masking, a plurality of regions (patterns) having different alignment directions can be formed on the alignment film.

[0114] The photo-alignment film can be generally obtained by applying a composition for forming a photo-alignment film containing a polymer or a monomer having a photoreactive group and a solvent on a substrate or the like, removing the solvent, and then irradiating polarized light (preferably, polarized UV light). For the photo-alignment film, by selecting the polarization direction of the irradiated polarized light, the direction of the alignment control force can be arbitrarily controlled.

[0115] The so-called photoreactive group is a group that has the ability to be oriented by light irradiation. Specifically, examples include groups that participate in orientation-inducing reactions, isomerization reactions, photodimerization reactions, photocrosslinking reactions, or photodecomposition reactions of molecules that occur by light irradiation, and that become the source of the ability to be oriented. As the photoreactive group, a group having an unsaturated bond, particularly a double bond, is preferable, and a group having at least one selected from the group consisting of carbon-carbon double bonds (C=C bonds), carbon-nitrogen double bonds (C=N bonds), nitrogen-nitrogen double bonds (N=N bonds), and carbon-oxygen double bonds (C=O bonds) is particularly preferable.

[0116] As the photoreactive group having a C=C bond, examples include, for example, vinyl groups, polyene groups, stilbenyl groups, stilbazole groups, stilbazolium groups, chalcone groups, and cinnamoyl groups. As the photoreactive group having a C=N bond, examples include groups having structures such as aromatic Schiff bases, aromatic hydrazones, and the like. As the photoreactive group having an N=N bond, examples include, for example, azobenzene groups, azonaphthalene groups, aromatic heterocyclic azo groups, bisazo groups, formazan groups, and groups having an azobenzene oxide structure. As the photoreactive group having a C=O bond, examples include, for example, benzophenone groups, coumarin groups, anthraquinone groups, and maleimide groups. These groups can have substituents such as alkyl groups, alkoxy groups, aryl groups, allyloxy groups, cyano groups, alkoxycarbonyl groups, hydroxyl groups, sulfonic acid groups, halogenated alkyl groups, and the like.

[0117] From the viewpoint of excellent orientation properties, groups that participate in photodimerization reactions or photocrosslinking reactions are preferable. Among these, photoreactive groups that participate in photodimerization reactions are preferable, from the viewpoint that the amount of polarized light irradiation required for orientation is small, and that it is easy to obtain a photoalignment film having excellent thermal stability and chronically stable properties. Cinnamoyl groups and chalcone groups are particularly preferable. As the polymer having a photoreactive group, a polymer having a cinnamoyl group in which the terminal portion of the side chain of the polymer is a cinnamic acid structure or a cinnamic ester structure is particularly preferable.

[0118] The content of the polymer or monomer having a photoreactive group in the photoalignment film-forming composition can be adjusted according to the kind of the polymer or monomer, and the thickness of the target photoalignment film, and is preferably at least 0.2% by mass or more, and more preferably in the range of 0.3 to 10% by mass.

[0119] As the method of applying the photoalignment film-forming composition, the same methods as those described below for the method of applying the optical anisotropic layer-forming composition can be used. As the method of removing the solvent from the applied photoalignment film-forming composition, the same methods as those described below for the method of removing the solvent from the alignment polymer composition can be used.

[0120] In order to irradiate polarized light, it is possible to irradiate polarized light directly to the product obtained after removing the solvent from the composition for a light orientation film to be applied to a substrate or the like, or it is possible to irradiate polarized light from the side of the substrate or the like to be applied, and to perform the irradiation by allowing the polarized light to pass through. In addition, it is preferable that the polarized light be substantially parallel light. The wavelength of the polarized light to be irradiated is preferably a wavelength in a wavelength region in which the light-reactive group of the polymer or monomer having a light-reactive group can absorb light energy. Specifically, it is particularly preferable that the wavelength be in the range of 250 nm to 400 nm of UV (ultraviolet). As a light source for irradiating the polarized light, there are a xenon lamp, a high-pressure mercury lamp, an ultrahigh-pressure mercury lamp, a metal halide lamp, an ultraviolet laser such as KrF, ArF, and the like. Among these, the high-pressure mercury lamp, the ultrahigh-pressure mercury lamp, and the metal halide lamp are preferable because the emission intensity of ultraviolet light having a wavelength of 313 nm is large.

[0121] By allowing the light from the aforementioned light source to pass through a suitable polarizing element, it is possible to irradiate polarized UV light. As the polarizing element, there are a polarizing filter, a polarizing prism such as a Glan-Thompson and a Glan-Taylor, and a wire grid. Among these, from the viewpoint of large-area and heat resistance, a polarizing element of the wire grid type is preferable.

[0122] Note that, when rubbing or polarized light irradiation is performed, if masking is performed, it is also possible to form a plurality of regions (patterns) in which the direction of liquid crystal orientation is different.

[0123] A groove orientation film is a film having a concave-convex pattern or a plurality of grooves (slots) on the film surface. When a polymerizable liquid crystal compound is applied to a film having a plurality of linear grooves arranged at regular intervals, the liquid crystal molecules will be oriented in the direction along the slots.

[0124] As a method for obtaining a groove orientation film, there are a method in which a photosensitive polyimide film surface is exposed through a mask for exposure having a pattern shape, and then developed and rinsed to form a concave-convex pattern; a method in which a layer of a UV-cured resin before curing is formed on a plate-like original having slots on the surface, the resin layer is transferred to a substrate or the like, and then cured; a method in which a roll-shaped original having a plurality of slots is pressed against a film of a UV-cured resin before curing formed on a substrate or the like, thereby forming a concave-convex, and then cured; and the like.

[0125] [Polarizing layer]

[0126] The elliptical polarizing plate of the present application has a polarizing layer after the orientation layer B. The polarizing layer can be produced by coating a composition containing a polymerizable liquid crystal compound (hereinafter, also referred to as "polarizing layer-forming composition") on the orientation layer B to form a polarizing layer formed of a dichroic pigment and a polymer of the polymerizable liquid crystal compound in an oriented state. That is, light having a vibration plane parallel to the absorption axis is absorbed and light having a vibration plane orthogonal to the absorption axis is transmitted by anisotropic absorption of light using the dichroic pigment contained in the liquid crystal compound, thereby becoming a polarizing plate. Such a polarizing plate is preferred from the viewpoint of being able to arbitrarily control the hue using the dichroic pigment and from the viewpoint of being able to achieve thinness. In addition, the polarizing layer-forming composition can further contain a solvent, a photopolymerization initiator, a photosensitizer, a polymerization inhibitor, a leveling agent, and an adhesion improver, and the like.

[0127] The polarizing layer in the elliptical polarizing plate of the present application can generally be formed by coating a polarizing layer-forming composition on the orientation layer B formed on a transparent substrate or the like and polymerizing the polymerizable liquid crystal compound contained in the polarizing layer-forming composition. The polarizing layer is generally a film having a thickness of 5 μm or less, preferably 4 μm or less, and more preferably 3 μm or less, obtained by curing the polymerizable liquid crystal compound in an oriented state. When the film thickness is thicker than the above range, there is a tendency that the orientation control force based on the orientation film decreases and orientation defects easily occur.

[0128] In order to obtain the polarizing properties in the X-Y plane, the polymerizable liquid crystal compound is cured in a state in which the dichroic pigment and the polymerizable liquid crystal compound are horizontally oriented with respect to the surface of the transparent substrate, and in order to obtain the polarizing properties in the Z direction (the film thickness direction of the polarizing layer), the polymerizable liquid crystal compound is cured in a state in which the dichroic pigment and the polymerizable liquid crystal compound are vertically oriented with respect to the surface of the transparent substrate. At this time, from the viewpoint of selectivity of polarized light absorption, a liquid crystal cured film obtained by curing the polymerizable liquid crystal compound in a state of a smectic liquid crystal phase, and further preferably a liquid crystal cured film obtained by curing the polymerizable liquid crystal compound in a state of a high-order smectic liquid crystal phase are preferred. The high-order smectic liquid crystal phase herein refers to a smectic B phase, a smectic D phase, a smectic E phase, a smectic F phase, a smectic G phase, a smectic H phase, a smectic I phase, a smectic J phase, a smectic K phase, and a smectic L phase, among which a smectic B phase, a smectic F phase, and a smectic I phase are more preferred.

[0129] When these are high-order smectic liquid crystal phases, a polarizing layer having a high degree of alignment order can be produced. In addition, the polarizing layer produced from a high-order smectic liquid crystal phase having a high degree of alignment order as described above is a polarizing layer that obtains a Bragg peak from a high-order structure such as a hexagonal phase or a crystal phase in X-ray diffraction measurement. This Bragg peak is a peak from a planar periodic structure of molecular alignment, and a polarizing layer having a periodic interval of 20 nm or less can be obtained by the composition for polarizing layer formation according to the present embodiment.

[0130] Whether or not the polymerizable liquid crystal compound exhibits a nematic liquid crystal phase or a smectic liquid crystal phase can be confirmed, for example, in the following manner. The composition for polarizing layer formation is applied to a substrate to form a coated film, and then, under conditions in which the polymerizable liquid crystal compound does not polymerize, heat treatment is performed, whereby the solvent contained in the coated film is removed. Next, the coated film formed on the substrate is heated to the isotropic phase temperature, and slowly cooled, whereby a liquid crystal phase is exhibited, and the exhibited liquid crystal phase is examined using texture observation based on a polarizing microscope, X-ray diffraction measurement, or differential scanning calorimetry. In the nematic liquid crystal phase and the smectic liquid crystal phase, it is confirmed that the polymerizable liquid crystal compound does not undergo phase separation from the dichroic dye, for example, by surface observation using various microscopes, or scattering degree measurement using a haze meter.

[0131] For the optically anisotropic layer obtained by curing the polymerizable liquid crystal compound in a state in which the dichroic dye and the polymerizable liquid crystal compound are horizontally aligned with respect to the surface of the transparent substrate, the ratio of the absorbance Al(λ) in the horizontal direction of the liquid crystal alignment to the absorbance A2(λ) in the vertical direction of the liquid crystal alignment with respect to light of wavelength λ nm (dichroic ratio) is preferably 7 or more, more preferably 20 or more, and further preferably 30 or more. The higher this value, the more excellent the absorption selectivity of the polarizing plate. Although depending on the type of the dichroic dye, in the case of a liquid crystal cured film obtained by curing in a state of a nematic liquid crystal phase, it is around 5 to 10.

[0132] ​By mixing two or more kinds of dichroic dyes having different absorption wavelengths, a polarizing layer of various hues can be produced, and a polarizing layer having absorption in the entire visible light range can be formed. By forming a polarizing layer having such an absorption characteristic, black coloration can occur, and the polarizing layer can be used for various purposes. The polarizing performance of the polarizing layer can be measured using a spectrophotometer. For example, a device in which a folder with a polarizing sheet is provided to a spectrophotometer can be used, and the transmittance (Tl) in the direction of the transmission axis (perpendicular to the orientation direction) and the transmittance (T2) in the direction of the absorption axis (parallel to the orientation direction) can be measured in the range of 380 nm to 780 nm, which is the wavelength of visible light, using a double-beam method. For the polarizing performance in the visible light range, the monomer transmittance, the degree of polarization at each wavelength are calculated using the following equations (Equation 1) and (Equation 2), and further, the visibility is corrected by 2-degree field of view (C light source) according to JIS Z 8701, whereby the visibility-corrected monomer transmittance (Ty) and the visibility-corrected degree of polarization (Py) can be calculated. In addition, the colorimetric values a* and b* in the L*a*b* (CIE) colorimetric system are calculated from the transmittance measured in the same manner using the color matching function of the C light source, whereby the hue of the polarizing sheet alone (monomer hue), the hue when the polarizing sheets are arranged in parallel (parallel hue), and the hue when the polarizing sheets are arranged orthogonally (orthogonal hue) can be obtained.

[0133] The closer the values of a* and b* are to 0, the more neutral the hue is.

[0134] Monomer transmittance (%) = (Tl + T2) / 2 ··· (Equation 1)

[0135] Degree of polarization (%) = (Tl - T2) / (Tl + T2) x 100 ··· (Equation 2)

[0136] [Polymerizable liquid crystal compound for forming a polarizing layer]

[0137] The so-called polymerizable liquid crystal compound is a compound having a polymerizable group and having liquid crystallinity. The polymerizable group is a group that participates in polymerization, and is preferably a photopolymerizable group. The so-called photopolymerizable group herein is a group that participates in polymerization by active radicals, acids, or the like generated from a photopolymerization initiator described later. As the polymerizable group, a vinyl group, a vinyloxy group, a 1-chlorovinyl group, an isopropenyl group, a 4-vinylphenyl group, an acryloyloxy group, a methacryloyloxy group, an oxiranyl group, an oxetanyl group, or the like can be given. Among these, an acryloyloxy group, a methacryloyloxy group, a vinyloxy group, an oxiranyl group, and an oxetanyl group are preferable, and an acryloyloxy group is more preferable. The liquid crystal can be a thermotropic liquid crystal or a lyotropic liquid crystal, but in the case of being mixed with the dichroic dye described later, a thermotropic liquid crystal is preferable.

[0138] When the polymerizable liquid crystal compound is a thermotropic liquid crystal, it can be a thermotropic liquid crystal compound exhibiting a nematic liquid crystal phase or a thermotropic liquid crystal compound exhibiting a smectic liquid crystal phase. In the present application, from the viewpoint of obtaining a higher polarizing property, the polymerizable liquid crystal compound is preferably a smectic liquid crystal compound, more preferably a higher-order smectic liquid crystal compound. Among them, a higher-order smectic liquid crystal compound that forms a smectic B phase, a smectic D phase, a smectic E phase, a smectic F phase, a smectic G phase, a smectic H phase, a smectic I phase, a smectic J phase, a smectic K phase, or a smectic L phase is more preferable, and a higher-order smectic liquid crystal compound that forms a smectic B phase, a smectic F phase, or a smectic I phase is further preferable. When the liquid crystal phase formed by the polymerizable liquid crystal compound is one of these higher-order smectic phases, a polarizing layer having a higher polarizing property can be produced. In addition, the polarizing layer having a high polarizing property as described above is a polarizing layer that obtains a Bragg peak from a higher-order structure such as a hexagonal phase or a crystal phase in X-ray diffraction measurement. This Bragg peak is a peak from a periodic structure of molecular orientation, and a film having a periodic interval of 2π / d (d: distance between molecules) can be obtained. From the viewpoint of obtaining a higher polarizing property, the polarizing layer used in the present application preferably contains a polymer of the polymerizable liquid crystal compound obtained by polymerizing the polymerizable liquid crystal compound in a smectic phase.

[0139] As such a compound, specifically, a compound represented by the following formula (A) (hereinafter, sometimes referred to as compound (A)) or the like can be mentioned. The polymerizable liquid crystal compound can be used alone or in combination with two or more kinds.

[0140] U 1 -V 1 -W 1 -X 1 -Y 1 -X 2 -Y 2 -X 3 -W 2 -V 2 -U 2 (A)

[0141] [In formula (A),

[0142] X 1 , X 2 , and X 3 each independently represent a divalent aromatic group or a divalent alicyclic hydrocarbon group, in which a hydrogen atom contained in the divalent aromatic group or the divalent alicyclic hydrocarbon group can be substituted with a halogen atom, an alkyl group having 1 to 4 carbon atoms, a fluoroalkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a cyano group, or a nitro group, and a carbon atom constituting the divalent aromatic group or the divalent alicyclic hydrocarbon group can be replaced with an oxygen atom, a sulfur atom, or a nitrogen atom. Among them, X 1 , X 2 , and X​3 At least one of them is 1,4-phenylene, which may have substituents, or cyclohexane-1,4-diyl, which may have substituents.

[0143] Y 1 Y 2 W 1 and W 2 They are independent of each other and are either single bonds or divalent connecting groups.

[0144] V 1 and V 2 The terms "alkanes" and "alkane dimers" can be used independently to represent alkane dimers with 1 to 20 carbon atoms that can have substituents. The -CH2- group that constitutes the alkane dimer can be replaced by -O-, -S-, or -NH-.

[0145] U 1 and U 2 Each of the following groups represents a polymeric group or a hydrogen atom independently, with at least one being a polymeric group.

[0146] In compound (A), X is preferred. 1 X 2 and X 3 At least one of them is a 1,4-phenylene that may have substituents, or a cyclohexane-1,4-diyl that may have substituents. In particular, X 1 and X 3 More preferably, it is a cyclohexane-1,4-diyl group that may have substituents, and this cyclohexane-1,4-diyl group is more preferably trans-cyclohexane-1,4-diyl. In the case of a structure containing trans-cyclohexane-1,4-diyl, there is a tendency to readily exhibit smectic liquid crystal properties. Furthermore, examples of substituents optionally present in the 1,4-phenylene group that may have substituents, or in the cyclohexane-1,4-diyl group that may have substituents, include alkyl groups having 1 to 4 carbon atoms such as methyl, ethyl, and butyl, cyano groups, and halogen atoms such as chlorine and fluorine atoms, and unsubstituted groups are preferred.

[0147] Y 1 and Y 2 The preferred independent bonds are single bonds, -CH2CH2-, -CH2O-, -COO-, -OCO-, -N=N-, and -CR. a =CR b -、-C≡C- or CR a =N-,R a and R b Each can be independently represented as either a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. 1 and Y 2 More preferably, it is -CH2CH2-, -COO-, -OCO-, or a single bond; more preferably, it is Y. 1 and Y 2are different from each other. 1 and Y 2 In the case where they are different from each other, there is a tendency to easily exhibit a smectic liquid crystal phase.

[0148] W 1 and W 2 are preferably independently of each other a single bond, -O-, -S-, -COO-, or OCO-, and are more preferably independently of each other a single bond or -O-.

[0149] The alkane diyl group having 1 to 20 carbon atoms represented by V 1 and V 2 having 1 to 20 carbon atoms can be exemplified by methylene, ethylene, propane-1, 3-diyl, butane-1, 3-diyl, butane-1, 4-diyl, pentane-1, 5-diyl, hexane-1, 6-diyl, heptane-1, 7-diyl, octane-1, 8-diyl, decane-1, 10-diyl, tetradecane-1, 14-diyl, and eicosane-1, 20-diyl. V 1 and V 2 is preferably an alkane diyl group having 2 to 12 carbon atoms, and is more preferably a straight-chain alkane diyl group having 6 to 12 carbon atoms. By being a straight-chain alkane diyl group having 6 to 12 carbon atoms, there is a tendency to improve crystallinity and easily exhibit a smectic liquid crystal phase.

[0150] The substituent that the alkane diyl group having 1 to 20 carbon atoms optionally has as a substituent that can have a substituent can be exemplified by a cyano group and a halogen atom such as a chlorine atom and a fluorine atom, and the alkane diyl group is preferably unsubstituted, and an unsubstituted straight-chain alkane diyl group is more preferable.

[0151] U 1 and U 2 are preferably both polymerizable groups, and are more preferably both photopolymerizable groups. A polymerizable liquid crystal compound having a photopolymerizable group can be polymerized at a low temperature compared to a polymerizable liquid crystal compound having a thermal polymerizable group, and is thus advantageous in terms of forming a polymer in a state having a high degree of order from a liquid crystal.

[0152] U 1 and U 2 are preferably the same as each other, but can be different from each other. As the polymerizable group, there can be exemplified a vinyl group, a vinyloxy group, a 1-chlorovinyl group, an isopropenyl group, a 4-vinylphenyl group, an acryloyloxy group, a methacryloyloxy group, an oxiranyl group, an oxetanyl group, and the like. Among them, an acryloyloxy group, a methacryloyloxy group, a vinyloxy group, an oxiranyl group, and an oxetanyl group are preferable, and a methacryloyloxy group or an acryloyloxy group is more preferable.

[0153] As such a polymerizable liquid crystal compound, for example, a polymerizable liquid crystal compound represented by the following formulae can be given.

[0154]

[0155]

[0156]

[0157] Among the aforementioned compounds exemplified, at least one selected from the group consisting of the compounds represented by formula (1-2), formula (1-3), formula (1-4), formula (1-6), formula (1-7), formula (1-8), formula (1-13), formula (1-14), and formula (1-15) is preferable.

[0158] The compound (A) exemplified can be used alone or in combination for the polarizing layer. In addition, in the case where two or more polymerizable liquid crystal compounds are combined, at least one is preferably the compound (A), and more preferably two or more are the compound (A). By combining two or more polymerizable liquid crystal compounds, the liquid crystallinity can be temporarily maintained even at a temperature below the liquid crystal-crystalline phase transition temperature. As the mixing ratio in the case where two polymerizable liquid crystal compounds are combined, it is usually 1:99 to 50:50, preferably 5:95 to 50:50, and more preferably 10:90 to 50:50.

[0159] The compound (A) can be produced, for example, by the known method described in Lub et al. Recl. Trav. Chim. Pays-Bas, 115, 321-328 (1996), or Japanese Patent No. 4719156, and the like.

[0160] As the content ratio of the polymerizable liquid crystal compound in the composition for forming a polarizing layer, it is usually 50 to 99.5 parts by mass, preferably 60 to 99 parts by mass, more preferably 70 to 98 parts by mass, and further preferably 80 to 97 parts by mass, relative to 100 parts by mass of the solid content of the composition for forming a polarizing layer. When the content ratio of the polymerizable liquid crystal compound is within the above range, there is a tendency that the alignment property is improved. Here, the solid content refers to the total amount of the components remaining after the solvent is removed from the composition for forming a polarizing layer.

[0161] [Dichroic dye for forming a polarizing layer]

[0162] The so-called dichroic dye is a dye having a property that the absorbance in the direction of the long axis of the molecule is different from the absorbance in the direction of the short axis of the molecule. As the dichroic dye, it is preferable to have a property of absorbing visible light, and more preferable to have a maximum absorption wavelength (λMAX) in the range of 380 to 680 nm. As such dichroic dyes, there can be mentioned, for example, acridine dyes, oxazine dyes, cyanine dyes, naphthalene dyes, azo dyes, and anthraquinone dyes, among which azo dyes are preferable. As the azo dyes, there can be mentioned monoazo dyes, disazo dyes, triazo dyes, tetraazo dyes, and stilbazol dyes, among which disazo dyes and triazo dyes are preferable. The dichroic dyes can be used alone or in combination, and in order to obtain absorption in the entire visible light range, it is preferable to combine three or more kinds of dichroic dyes, and more preferable to combine three or more kinds of azo dyes.

[0163] As the azo dye, there can be mentioned, for example, a compound represented by formula (B) (hereinafter, sometimes referred to as "compound (B)").

[0164] T 1 -A 1 (-N=N-A 2 ) p -N=N-A 3 -T 2 (B)

[0165] [In formula (B),

[0166] A 1 , A 2 , and A 3 independently of one another represent 1,4-phenylene, naphthalene-1,4-diyl which can have a substituent, or a divalent heterocyclic group which can have a substituent, A 1 or / and A 2 is 1,4-phenylene, T 1 , and T 2 are electron-withdrawing groups or electron-donating groups, and are located at a position substantially 180° with respect to the plane of the azo bond. p represents an integer of 0 to 4. When p is 2, the two A 2 may be the same or different from each other.]

[0167] As A 1 , A 2 , and A 3The substituents which the 1,4-phenylene, naphthalene-1,4-diyl and divalent heterocyclic group optionally has in the above-mentioned formula (1) can be exemplified by alkyl groups having 1 to 4 carbon atoms such as methyl, ethyl and butyl; alkoxy groups having 1 to 4 carbon atoms such as methoxy, ethoxy and butoxy; fluorinated alkyl groups having 1 to 4 carbon atoms such as trifluoromethyl; cyano group; nitro group; halogen atoms such as chlorine atom and fluorine atom; substituted or unsubstituted amino groups (so-called substituted amino group means an amino group having one or two alkyl groups having 1 to 6 carbon atoms, or an amino group in which two substituted alkyl groups are bonded to each other to form an alkane diyl group having 2 to 8 carbon atoms. The unsubstituted amino group is -NH2.) such as amino group, diethylamino group and pyrrolidino group. Note that, as the alkyl group having 1 to 6 carbon atoms, there can be exemplified methyl group, ethyl group and hexyl group. As the alkane diyl group having 2 to 8 carbon atoms, there can be exemplified ethylene group, propane-1,3-diyl group, butane-1,3-diyl group, butane-1,4-diyl group, pentane-1,5-diyl group, hexane-1,6-diyl group, heptane-1,7-diyl group and octane-1,8-diyl group. In order to be included in a highly ordered liquid crystal structure such as a smectic phase liquid crystal, A 1 , A 2 and A 3 is preferably 1,4-phenylene which is unsubstituted or substituted with methyl group or methoxy group, or a divalent heterocyclic group, and p is preferably 0 or 1. Of these, it is more preferable that p is 1 and A 1 , A 2 and A 3 is 1,4-phenylene.

[0168] As the divalent heterocyclic group, there can be exemplified a group obtained by removing two hydrogen atoms from quinoline, thiazole, benzothiazole, thienothiazole, imidazole, benzimidazole, oxazole and benzoxazole. A 2 When A is a divalent heterocyclic group, it is preferable that the molecular bond angle substantially becomes 180°, and more specifically, it is preferable that benzothiazole, benzimidazole, benzoxazole structure in which two five-membered rings are fused is formed.

[0169] T 1 and T 2 is an electron-withdrawing group or an electron-donating group, it is preferable that they are different structures, and further, it is preferable that T 1 is an electron-withdrawing group and T 2 is an electron-donating group, or T 1 is an electron-donating group and T 2 is an electron-withdrawing group. More specifically, T 1 and T 2independently of one another, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms, cyano, nitro, amino having 1 or 2 alkyl groups having 1 to 6 carbon atoms, or amino in which 2 substituted alkyl groups are bonded to each other to form alkanediyl having 2 to 8 carbon atoms, or trifluoromethyl, wherein, in order to be included in a highly ordered liquid crystal structure such as a smectic phase liquid crystal, it is necessary to be a structure having a small excluded volume of molecules, and therefore, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms, cyano, amino having 1 or 2 alkyl groups having 1 to 6 carbon atoms, or amino in which 2 substituted alkyl groups are bonded to each other to form alkanediyl having 2 to 8 carbon atoms are preferred.

[0170] As such an azo dye, for example, the following azo dyes can be mentioned.

[0171]

[0172] in formulae (2-1) to (2-6),

[0173] B 1 ~B 20 independently of one another, hydrogen atom, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms, cyano, nitro, substituted or unsubstituted amino (the definition of substituted amino and unsubstituted amino is as described above), chlorine atom, or trifluoromethyl.

[0174] n1 to n4 each independently represent an integer of 0 to 3.

[0175] when n1 is 2 or more, a plurality of B 2 may be the same or different,

[0176] when n2 is 2 or more, a plurality of B 6 may be the same or different,

[0177] when n3 is 2 or more, a plurality of B 9 may be the same or different,

[0178] when n4 is 2 or more, a plurality of B 14 may be the same or different.

[0179] As the aforementioned anthraquinone dye, a compound represented by formula (2-7) is preferred.

[0180]

[0181] [In formula (2-7),

[0182] R 1 ~R 8 independently of one another, hydrogen atom, -R x-NH2, -NHR x -NR x 2. -SR x Or halogen atoms.

[0183] R x This refers to an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 12 carbon atoms.

[0184] The preferred oxazine pigment is the compound represented by formula (2-8).

[0185]

[0186] In equation (2-8),

[0187] R 9 ~R 15 Independently representing hydrogen atoms, -R x -NH2, -NHR x -NR x 2. -SR x Or halogen atoms.

[0188] R x This refers to an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 12 carbon atoms.

[0189] The preferred acridine dyes are those represented by formulas (2-9).

[0190]

[0191] In equation (2-9),

[0192] R 16 ~R 23 Independently representing hydrogen atoms, -R x -NH2, -NHR x -NR x 2. -SR x Or halogen atoms.

[0193] R x This refers to an alkyl group having 1 to 4 carbon atoms or an aryl group having 6 to 12 carbon atoms.

[0194] R in equations (2-7), (2-8), and (2-9) x Alkyl groups having 1 to 4 carbon atoms can be exemplified by methyl, ethyl, propyl, butyl, pentyl, and hexyl, while aryl groups having 6 to 12 carbon atoms can be exemplified by phenyl, tolueneyl, xylyl, and naphthyl.

[0195] As the aforementioned cyanine dye, a compound represented by formula (2-10) and a compound represented by formula (2-11) are preferred.

[0196]

[0197] [In formula (2-10),

[0198] D 1 and D 2 independently of one another represent a group represented by any one of formulae (2-10a) to (2-10d).

[0199]

[0200] n5 represents an integer of 1 to 3.

[0201]

[0202] [In formula (2-11),

[0203] D 3 and D 4 independently of one another represent a group represented by any one of formulae (2-11a) to (2-11h).

[0204]

[0205] n6 represents an integer of 1 to 3.

[0206] As for the content of the dichroic dye (total amount in the case of a plurality of kinds), it is usually 1 to 30 parts by mass, preferably 2 to 20 parts by mass, and more preferably 3 to 15 parts by mass, relative to 100 parts by mass of the polymerizable liquid crystalline compound, from the viewpoint of obtaining good light absorption properties. When the content of the dichroic dye is less than the above range, light absorption becomes insufficient, and sufficient polarizing properties are not obtained. When the content is more than the above range, the alignment of the liquid crystal molecules is sometimes inhibited.

[0207] [Angle formed by the polarizing layer and the phase difference layer]

[0208] In the present application, the optical axes of the polarizing layer and the phase difference layer are not substantially in parallel, that is, the optical axis of the polarizing layer and the optical axis of the phase difference layer are not substantially not intersecting in the plane of the elliptical polarizing plate, and the optical axis of the polarizing layer and the optical axis of the phase difference layer intersect in the plane of the elliptical polarizing plate. The angle formed by the mutually intersecting optical axis of the polarizing layer and the optical axis of the phase difference layer is preferably 40 to 50°, more preferably 41 to 49°, further preferably 43 to 47°, particularly preferably substantially 45°, and ideally 45°, with respect to the angle formed by the slow axis of the phase difference layer and the absorption axis of the polarizing layer. When the angle formed by the slow axis of the phase difference layer and the absorption axis of the polarizing layer is within the above range, the ellipticity is increased, and particularly when it is 45°, the polarizing plate of the present application substantially functions as a circular polarizing plate.

[0209] [Solvent]

[0210] As the solvent, a solvent capable of completely dissolving the polymerizable liquid crystal compound used in forming the aforementioned phase difference layer or polarizing layer is preferred, and a solvent which is not active with respect to the polymerization reaction of the polymerizable liquid crystal compound is preferred.

[0211] As the solvent, for example, alcohol solvents such as methanol, ethanol, ethylene glycol, isopropyl alcohol, propylene glycol, ethylene glycol methyl ether, ethylene glycol butyl ether, and propylene glycol monomethyl ether; ester solvents such as ethyl acetate, butyl acetate, ethylene glycol methyl ether acetate, γ-butyrolactone, propylene glycol methyl ether acetate, and ethyl lactate; ketone solvents such as acetone, methyl ethyl ketone, cyclopentanone, cyclohexanone, 2-heptanone, and methyl isobutyl ketone; aliphatic hydrocarbon solvents such as pentane, hexane, and heptane; aromatic hydrocarbon solvents such as toluene and xylene; nitrile solvents such as acetonitrile; ether solvents such as tetrahydrofuran and dimethoxyethane; chlorine-containing solvents such as chloroform and chlorobenzene; amide solvents such as dimethylacetamide, dimethylformamide, N-methyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone, and the like can be given. These solvents can be used alone or in combination of two or more. Among these, alcohol solvents, ester solvents, ketone solvents, chlorine-containing solvents, amide solvents, and aromatic hydrocarbon solvents are preferred.

[0212] The content of the solvent in the composition of 100 parts by mass is preferably 50 parts by mass to 98 parts by mass, and more preferably 70 parts by mass to 95 parts by mass. Therefore, the content of the solid component in the composition of 100 parts by mass is preferably 2 parts by mass to 50 parts by mass. When the solid component of the composition is 50 parts by mass or less, there is a tendency that the viscosity of the composition becomes low, and thus the thickness of the film containing the polymerizable liquid crystal compound becomes substantially uniform, and unevenness is less likely to occur in the film containing the polymerizable liquid crystal compound. The above-mentioned solid component can be appropriately determined in consideration of the thickness of the film containing the polymerizable liquid crystal compound to be produced.

[0213] [Photopolymerization initiator]

[0214] The polymerization initiator is a compound that can initiate the polymerization reaction of the polymerizable liquid crystal compound or the like. As the polymerization initiator, a photopolymerization initiator that generates a radical by light irradiation is more preferable.

[0215] As the photopolymerization initiator, there can be mentioned, for example, benzoin compounds, benzophenone compounds, benzil ketals, α-hydroxy ketone compounds, α-amino ketone compounds, triazine compounds, iodonium salts, and sulfonium salts. Specifically, there can be mentioned Irgacure 907, Irgacure 184, Irgacure 651, Irgacure 819, Irgacure 250, Irgacure 369, Irgacure 379, Irgacure 127, Irgacure 2959, Irgacure 754, Irgacure 379EG (all of which are manufactured by BASF Japan Ltd.), SEIKUOL BZ, SEIKUOL Z, SEIKUOL BEE (all of which are manufactured by Seiko Chemicals Ltd.), kayacure BP100 (manufactured by Nippon Kayaku Co., Ltd.), kayacure UVI-6992 (manufactured by DOW Chemical Company), ADEKA OPTOMER SP-152, ADEKA OPTOMER SP-170, ADEKA OPTOMER N-1717, ADEKA OPTOMER N-1919, ADEKA ARKLS NCI-831, ADEKA ARKLS NCI-930 (all of which are manufactured by ADEKA Corporation), TAZ-A, TAZ-PP (all of which are manufactured by SiberHegner Japan), and TAZ-104 (manufactured by Sanwa Chemical Co., Ltd.).

[0216] The photopolymerization initiator contained in the phase difference layer-forming composition or the polarizing layer-forming composition is at least one kind, and preferably one or two kinds.

[0217] For the photopolymerization initiator, in order to sufficiently effectively utilize the energy emitted from the light source and to make the productivity excellent, the maximum absorption wavelength is preferably 300 nm to 380 nm, and more preferably 300 nm to 360 nm, and among them, an α-methylacetophenone-based polymerization initiator and an oxime-based photopolymerization initiator are preferable.

[0218] As the α-benzophenone compound, 2-methyl-2-morpholino-1-(4-methylsulfanylphenyl)propan-1-one, 2-dimethylamino-1-(4-morpholinophenyl)-2-benzylbutan-1-one, 2-dimethylamino-1-(4-morpholinophenyl)-2-(4-methylphenylmethyl)butan-1-one, and the like can be given, and more preferably 2-methyl-2-morpholino-1-(4-methylsulfanylphenyl)propan-1-one, 2-dimethylamino-1-(4-morpholinophenyl)-2-benzylbutan-1-one, and the like can be given. As the commercially available product of the α-benzophenone compound, Irgacure 369, 379EG, 907 (manufactured by BASF Japan, Ltd.), SEIKUOL BEE (manufactured by Seiko Chemicals, Ltd.), and the like can be given.

[0219] The oxime-based photopolymerization initiator generates a methyl radical by irradiation of light. By the methyl radical, the polymerization of the polymerizable liquid crystal compound in the deep portion of the film containing the polymerizable liquid crystal compound is favorably performed. In addition, from the viewpoint of more efficiently performing the polymerization reaction in the deep portion of the film containing the polymerizable liquid crystal compound, it is preferable to use a photopolymerization initiator that can efficiently utilize ultraviolet rays having a wavelength of 350 nm or more. As the photopolymerization initiator that can efficiently utilize ultraviolet rays having a wavelength of 350 nm or more, a triazine compound, an oxime ester type carbazole compound, and more preferably an oxime ester type carbazole compound are preferable from the viewpoint of sensitivity. As the oxime ester type carbazole compound, 1,2-octanedione, 1-[4-(phenylsulfanyl)-2-(O-benzoyloxime)], O-acetyl-1-[9-ethyl-6-(2-methylbenzoyl)-9H-carbazol-3-yl]-1-(ethanone oxime), and the like can be given. As the commercially available product of the oxime ester type carbazole compound, Irgacure OXE-01, Irgacure OXE-02, Irgacure OXE-03 (manufactured by BASF Japan, Ltd.), ADEKA OPTOMER N-1919, ADEKA ARKLS NCI-831 (manufactured by ADEKA Corporation), and the like can be given.

[0220] The addition amount of the photopolymerization initiator is usually 0.1 parts by mass to 30 parts by mass, preferably 1 part by mass to 20 parts by mass, and more preferably 3 parts by mass to 18 parts by mass, with respect to 100 parts by mass of the polymerizable liquid crystal compound. When it is within the above range, the reaction of the polymerizable group sufficiently proceeds, and the alignment of the polymerizable liquid crystal compound is not easily disturbed.

[0221] By combining a polymerization inhibitor, the polymerization reaction of the polymerizable liquid crystal compound can be controlled. As the polymerization inhibitor, there are, for example, hydroquinone and hydroquinone having a substituent such as alkyl ether; catechol and catechol having a substituent such as alkyl ether; pyrogallol; 2,2,6,6-tetramethylpiperidine-1-oxyl radical and other radical scavengers; thiophenol; β-naphthylamine; and β-naphthol. As to the content of the polymerization inhibitor, in order to polymerize the polymerizable liquid crystal compound without disturbing the alignment of the polymerizable liquid crystal compound, it is generally 0.1 to 10 parts by mass, preferably 0.5 to 5 parts by mass, and further preferably 0.5 to 3 parts by mass, relative to 100 parts by mass of the polymerizable liquid crystal compound.

[0222] Further, by using a photosensitizer, the photopolymerization initiator can be made highly sensitive. As the photosensitizer, there are, for example, xanthone, thioxanthone, and other xanthones; anthracene and anthracene having a substituent such as alkyl ether; phenothiazine; and redmer. As the photosensitizer, there are, for example, xanthone, thioxanthone, and other xanthones; anthracene and anthracene having a substituent such as alkyl ether; phenothiazine; and redmer. As to the content of the photosensitizer, it is generally 0.1 to 10 parts by mass, preferably 0.5 to 5 parts by mass, and further preferably 0.5 to 3 parts by mass, relative to 100 parts by mass of the polymerizable liquid crystal compound.

[0223] [Leveling agent]

[0224] The so-called leveling agent is an additive having a function of adjusting the flowability of the composition and making the film obtained by coating the composition more flat, and examples thereof include organic-modified silicone oil-based, polyacrylate-based, and perfluoroalkyl-based leveling agents.Specifically, DC3PA, SH7PA, DC11PA, SH28PA, SH29PA, SH30PA, ST80PA, ST86PA, SH8400, SH8700, FZ2123 (all of which are manufactured by Dow Corning Toray Co., Ltd.), KP321, KP323, KP324, KP326, KP340, KP341, X22-161A, KF6001 (all of which are manufactured by Shokubai Co., Ltd.), TSF400, TSF401, TSF410, TSF4300, TSF4440, TSF4445, TSF-4446, TSF4452, TSF4460 (all of which are manufactured by Momentive Performance Materials Japan LLC), fluorinert (registered trademark) FC-72, fluorinert FC-40, fluorinert FC-43, fluorinert FC-3283 (all of which are manufactured by Sumitomo 3M Co., Ltd.), MEGAFACE (registered trademark) R-08, MEGAFACE R-30, MEGAFACE R-90, MEGAFACE F-410, MEGAFACE F-411, MEGAFACE F-443, MEGAFACE F-445, MEGAFACE F-470, MEGAFACE F-477, MEGAFACE F-479, MEGAFACE F-482, MEGAFACE F-483 (all of which are manufactured by DIC Corp.), EFTOP (trade name) EF301, EFTOP EF303, EFTOP EF351, EFTOP EF352 (all of which are manufactured by Mitsubishi Materials Electronic Chemicals Co., Ltd.), Surflon (registered trademark) S-381, Surflon S-382, Surflon S-383, Surflon S-393, Surflon SC-101, Surflon SC-105, KH-40, SA-100 (all of which are manufactured by AGC Seimi Chemical Co., Ltd.), trade name E1830, trade name E5844 (manufactured by Daikin Fine Chemical Kenkyusho, K.K.), BM-1000, BM-1100, BYK-352, BYK-353, and BYK-361N (all of which are trade names: manufactured by BYK-Chemie GmbH) can be mentioned. Among these, polyacrylate-based leveling agents and perfluoroalkyl-based leveling agents are preferable.

[0225] The content of the leveling agent in the phase difference layer-forming composition and the polarizing layer-forming composition used in the present application is preferably 0.01 parts by mass to 5 parts by mass, and further preferably 0.1 parts by mass to 3 parts by mass, relative to 100 parts by mass of the polymerizable liquid crystalline compound. When the content of the leveling agent is within the above range, the polymerizable liquid crystalline compound is easily horizontally oriented, and there is a tendency that the film containing the polymerizable liquid crystalline compound obtained becomes smoother, and thus it is preferred. The phase difference layer-forming composition and the polarizing layer-forming composition used in the present application can contain two or more kinds of leveling agents.

[0226] [Adhesive]

[0227] As the adhesive for adhering the polarizing layer to the phase difference layer, or the phase difference layer to the display device, a pressure-sensitive adhesive, a dry-cured adhesive, and a chemical reaction type adhesive can be given. As the chemical reaction type adhesive, for example, a active energy ray-curable adhesive can be given. As the adhesive between the polarizing layer and the phase difference layer, an adhesive layer formed of a pressure-sensitive adhesive, a dry-cured adhesive, or an active energy ray-curable adhesive is preferred, and as the adhesive between the phase difference layer and the display device, an adhesive layer formed of a pressure-sensitive adhesive or an active energy ray-curable adhesive is preferred.

[0228] The pressure-sensitive adhesive generally contains a polymer, and can also contain a solvent.

[0229] As the polymer, an acrylic polymer, a silicone polymer, a polyester, a polyurethane, or a polyether, etc. can be given. Among them, for the acrylic adhesive containing an acrylic polymer, optical transparency is excellent, and moderate wettability, cohesiveness, and adhesiveness are excellent, and weather resistance, heat resistance, etc. are excellent, and under the conditions of heating or humidification, floating, peeling, etc. are less likely to occur, and thus it is preferred.

[0230] As the acrylic polymer, a copolymer of a (meth)acrylate ester in which the alkyl group of the ester moiety is a methyl group, an ethyl group, or a butyl group, or the like, having 1 to 20 carbon atoms, and a (meth)acrylic acid, a (meth)acrylic acid hydroxyethyl ester, or the like, having a functional group, is preferred.

[0231] For the pressure-sensitive adhesive containing such a copolymer, adhesiveness is excellent, and when it is removed after being adhered to the display device, adhesive residues, etc. are not generated on the display device, and it can be easily removed, and thus it is preferred. The glass transition temperature of the acrylic polymer is preferably 25°C or lower, and more preferably 0°C or lower. The mass average molecular weight of such an acrylic polymer is preferably 100,000 or more.

[0232] As the solvent, the solvent listed above as the solvent, etc. can be given. The pressure-sensitive adhesive can contain a light diffusing agent. The light diffusing agent is an additive that imparts light diffusibility to the adhesive, and is a microparticle having a refractive index different from that of the polymer contained in the adhesive. As the light diffusing agent, a microparticle formed of an inorganic compound, and a microparticle formed of an organic compound (polymer) can be given. Since the polymer contained in the adhesive as an effective component has a refractive index of about 1.4 to 1.6 including an acrylic polymer, it is preferable to appropriately select from among light diffusing agents having a refractive index of 1.2 to 1.8. The difference between the refractive index of the polymer contained in the adhesive as an effective component and that of the light diffusing agent is usually 0.01 or more, and from the viewpoint of the brightness and display of the display device, it is preferable to be 0.01 to 0.2. The microparticle used as the light diffusing agent is preferably a spherical microparticle close to monodispersed microparticles, and more preferably a microparticle having an average particle diameter of 2 μm to 6 μm. The refractive index can be measured using a conventional minimum deviation angle method or an Abbe refractometer.

[0233] As the microparticle formed of an inorganic compound, alumina (refractive index 1.76) and silica (refractive index 1.45), etc. can be given. As the microparticle formed of an organic compound (polymer), melamine beads (refractive index 1.57), polymethyl methacrylate beads (refractive index 1.49), methyl methacrylate / styrene copolymer resin beads (refractive index 1.50 to 1.59), polycarbonate beads (refractive index 1.55), polyethylene beads (refractive index 1.53), polystyrene beads (refractive index 1.6), polyvinyl chloride beads (refractive index 1.46), and silicone resin beads (refractive index 1.46), etc. can be given. The content of the light diffusing agent is usually 3 parts by mass to 30 parts by mass with respect to 100 parts by mass of the polymer.

[0234] The thickness of the pressure-sensitive adhesive can be determined depending on the adhesion force thereof, etc., and thus is not particularly limited, and is usually 1 μm to 40 μm. From the viewpoint of the processability, durability, etc., the thickness is preferably 3 μm to 25 μm, and more preferably 5 μm to 20 μm. By making the thickness of the adhesive layer formed of the adhesive 5 μm to 20 μm, the brightness in the case of observing the display device from the front, and the case of observing the display device from the oblique direction can be maintained, and the occurrence of stains and blurring of the displayed image is less likely to occur.

[0235] [Adhesive of drying and curing type]

[0236] The adhesive of drying and curing type can contain a solvent.

[0237] As the dry-curing adhesive, a composition containing a polymer of a monomer having a protonic functional group such as a hydroxyl group, a carboxyl group or an amino group and an ethylenic unsaturated group, or a polyurethane resin as a main component, and further containing a crosslinking agent or a curable compound such as a polyvalent aldehyde, an epoxy compound, an epoxy resin, a melamine compound, a zirconium oxide compound, and a zinc compound can be exemplified. As the polymer of a monomer having a protonic functional group such as a hydroxyl group, a carboxyl group or an amino group and an ethylenic unsaturated group, an ethylene-maleic acid copolymer, an itaconic acid copolymer, an acrylic acid copolymer, an acrylamide copolymer, a saponified product of polyvinyl acetate, and a polyvinyl alcohol-based resin can be exemplified.

[0238] As the polyvinyl alcohol-based resin, polyvinyl alcohol, partially saponified polyvinyl alcohol, completely saponified polyvinyl alcohol, carboxyl-modified polyvinyl alcohol, acetyl acetyl-modified polyvinyl alcohol, hydroxymethyl-modified polyvinyl alcohol, and amino-modified polyvinyl alcohol can be exemplified. The content of the polyvinyl alcohol-based resin in the water-based adhesive is usually 1 to 10 parts by mass, and preferably 1 to 5 parts by mass, with respect to 100 parts by mass of water.

[0239] As the polyurethane resin, a polyester-based ionically crosslinking polymer type polyurethane resin can be exemplified.

[0240] The polyester-based ionically crosslinking polymer type polyurethane resin herein refers to a polyurethane resin having a polyester skeleton and a small amount of an ionic component (hydrophilic component) introduced therein. The ionically crosslinking polymer type polyurethane resin is emulsified in water without using an emulsifier to form an emulsion, and thus a water-based adhesive can be produced. In the case of using the polyester-based ionically crosslinking polymer type polyurethane resin, it is effective to incorporate a water-soluble epoxy compound as a crosslinking agent.

[0241] As the epoxy resin, a polyamide epoxy resin obtained by reacting a polyamide polyamine (which is obtained by reacting a polyalkylene polyamine such as diethylenetriamine or triethylenetetramine with a dicarboxylic acid such as adipic acid) with epichlorohydrin can be exemplified. As a commercial product of the polyamide epoxy resin, "SUMIREZ RESIN (registered trademark) 650" and "SUMIREZ RESIN 675" (both manufactured by Sumika Chemtex Co., Ltd.), "WS-525" (manufactured by PMC Corporation), and the like can be exemplified. In the case of incorporating the epoxy resin, the amount of addition is usually 1 to 100 parts by mass, and preferably 1 to 50 parts by mass, with respect to 100 parts by mass of the polyvinyl alcohol-based resin.

[0242] The thickness of the adhesive layer formed by the drying and curing type adhesive is usually 0.001 to 5 μm, preferably 0.01 to 2 μm, and further preferably 0.01 to 0.5 μm. When the adhesive layer formed by the drying and curing type adhesive is too thick, the optical anisotropic layer tends to have a poor appearance.

[0243] [Active energy ray-curable adhesive]

[0244] The active energy ray-curable adhesive can contain a solvent. The active energy ray-curable adhesive refers to an adhesive that is cured by irradiation with active energy rays.

[0245] As the active energy ray-curable adhesive, there are a cationically polymerizable adhesive containing an epoxy compound and a cationic polymerization initiator; a radically polymerizable adhesive containing an acrylic curing component and a radical polymerization initiator; an adhesive containing both a cationically polymerizable curing component such as an epoxy compound and a radically polymerizable curing component such as an acrylic compound, and further containing a cationic polymerization initiator and a radical polymerization initiator; and an adhesive not containing these polymerization initiators, which is cured by irradiation with an electron beam, and the like.

[0246] Among them, a radically polymerizable active energy ray-curable adhesive containing an acrylic curing component and a radical polymerization initiator, and a cationically polymerizable active energy ray-curable adhesive containing an epoxy compound and a cationic polymerization initiator are preferable. As the acrylic curing component, there are (meth)acrylate esters such as methyl (meth)acrylate and hydroxyethyl (meth)acrylate, and (meth)acrylic acid. The active energy ray-curable adhesive containing an epoxy compound can further contain a compound other than an epoxy compound. As the compound other than an epoxy compound, there are oxetane compounds, acrylic compounds, and the like.

[0247] As the radical polymerization initiator, there are the aforementioned photopolymerization initiators. As commercially available products of the cationic polymerization initiator, there are "KAYARAD" (registered trademark) series (manufactured by Nippon Shokubai Co., Ltd.), "CYRACURE UVI" series (manufactured by Dow Chemical Company), "CPI" series (manufactured by San-Apro Co., Ltd.), "TAZ", "BBI", and "DTS" (all manufactured by Midori Kagaku Co., Ltd.), "ADEKA OPTOMER" series (manufactured by ADEKA Corporation), "RHODORSIL" (registered trademark) (manufactured by Rhodia Co., Ltd.), and the like. The content of the radical polymerization initiator and the cationic polymerization initiator is usually 0.5 to 20 parts by mass, and preferably 1 to 15 parts by mass, relative to 100 parts by mass of the active energy ray-curable adhesive.

[0248] The active energy ray-curable adhesive can further contain an ion trapping agent, an antioxidant, a chain transfer agent, an adhesion promoter, a thermoplastic resin, a filler, a flow adjusting agent, a plasticizer, an antifoaming agent, and the like.

[0249] In the present specification, the active energy ray is defined as an energy ray that can decompose a compound that can generate an active species to generate an active species. As such active energy rays, visible light, ultraviolet rays, infrared rays, X-rays, α-rays, β-rays, γ-rays, and electron beams, and the like can be given, and ultraviolet rays and electron beams are preferable. The preferable irradiation conditions of ultraviolet rays are the same as those of the polymerization of the polymerizable liquid crystal compound.

[0250] [Refractive index of each layer of the laminate]

[0251] In a case where another layer B is laminated immediately below a certain layer A, when the refractive index of the layer A is denoted by nA and the refractive index of the layer B is denoted by nB, the interface reflectance in the layer A and the layer B when light is incident from a direction perpendicular to the layer A is represented by the following formula (K).

[0252] Interface reflectance (%) = (n A -n B ) 2 / (n A +n B ) 2 × 100...(K)

[0253] Therefore, when the difference in the refractive index between adjacent layers of the laminate is large, the loss due to the interface reflection becomes large. In an elliptically polarizing plate formed of a laminate, in order to reduce the influence of the loss due to the interface reflection, the difference in the refractive index between adjacent layers is preferably 0.20 or less, more preferably 0.15 or less, and further preferably 0.10 or less.

[0254] [Manufacturing method of the polarizing layer or the phase difference layer]

[0255] Hereinafter, the polarizing layer or the phase difference layer of the present application is sometimes referred to as an optically anisotropic layer. In addition, the polarizing layer-forming composition or the phase difference layer-forming composition is sometimes referred to as an optically anisotropic layer-forming composition. The manufacturing method of the polarizing layer and the manufacturing method of the phase difference layer can be the same or different.

[0256] [Coating of the optically anisotropic layer-forming composition]

[0257] The optically anisotropic layer can be formed by applying the composition for forming an optically anisotropic layer to the aforementioned transparent substrate or alignment film. As a method of applying the composition for forming an optically anisotropic layer to a substrate, there can be mentioned extrusion coating, direct gravure coating, reverse gravure coating, CAP coating, slit coating, microgravure coating, die coating, inkjet coating, and the like. In addition, there can be mentioned a method of applying using a coating machine such as a dip coater, a bar coater, a spin coater, and the like. Among them, in the case of applying continuously in a roll-to-roll manner, a coating method using microgravure coating, inkjet coating, slit coating, die coating is preferred, and in the case of applying to a single piece of a substrate such as glass, spin coating which is high in uniformity is preferred. In the case of applying in a roll-to-roll manner, an alignment film can also be formed by applying a composition for forming an optically anisotropic layer or the like to a substrate, and further, the composition for forming an optically anisotropic layer can be continuously applied to the obtained alignment film.

[0258] [Drying of the composition for forming an optically anisotropic layer]

[0259] As a drying method for removing the solvent contained in the composition for forming an optically anisotropic layer, there can be mentioned, for example, natural drying, air drying, heating drying, reduced pressure drying, and a method combining them. Among them, natural drying or heating drying is preferred. The drying temperature is preferably in the range of 0 to 200°C, more preferably in the range of 20 to 150°C, and further preferably in the range of 50 to 130°C. The drying time is preferably in the range of 10 seconds to 20 minutes, and more preferably in the range of 30 seconds to 10 minutes. The composition for forming an optically anisotropic layer and the alignment polymer composition can also be dried in the same manner.

[0260] [Polymerization of the polymerizable liquid crystal compound]

[0261] As a method of polymerizing the polymerizable liquid crystal compound, photopolymerization is preferred. The photopolymerization can be carried out by irradiating a laminate obtained by applying the composition for forming an optically anisotropic layer containing the polymerizable liquid crystal compound to a substrate or an alignment film with active energy rays. As the active energy rays to be irradiated, one or more kinds of light selected from the group consisting of visible light, ultraviolet light, infrared light, X-rays, α-rays, β-rays, and γ-rays can be appropriately selected depending on the kind of the polymerizable liquid crystal compound contained in the dried film (particularly, the kind of the photopolymerizable functional group possessed by the polymerizable liquid crystal compound), the kind of the photopolymerization initiator in the case where a photopolymerization initiator is contained, and the amount thereof. Specifically, there can be mentioned visible light, ultraviolet light, infrared light, X-rays, α-rays, β-rays, and γ-rays. Among them, from the aspects of easy control of the progress of the polymerization reaction, and the aspect that a device which has been widely used in the field as a photopolymerization device can be used, ultraviolet light is preferred, and the kind of the polymerizable liquid crystal compound is preferably selected in such a manner that photopolymerization can be carried out by ultraviolet light.

[0262] As the light source of the aforementioned active energy ray, for example, a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, an ultrahigh-pressure mercury lamp, a xenon lamp, a halogen lamp, a carbon arc lamp, a tungsten lamp, a gallium lamp, an excimer laser, an LED light source which emits light in a wavelength range of 380 to 440 nm, a chemical lamp, a black light, a microwave-excited mercury lamp, a metal halide lamp, and the like can be given.

[0263] The ultraviolet irradiation intensity is usually 10 mW / cm 2 to 3,000 mW / cm 2 The ultraviolet irradiation intensity is preferably an intensity in a wavelength region effective for the activation of a cationic polymerization initiator or a radical polymerization initiator. The irradiation light time is usually 0.1 seconds to 10 minutes, preferably 0.1 seconds to 5 minutes, more preferably 0.1 seconds to 3 minutes, and further preferably 0.1 seconds to 1 minute. When irradiation is performed once or a plurality of times at such an ultraviolet irradiation intensity, the cumulative light amount is usually 10 mJ / cm 2 to 3,000 mJ / cm 2 , preferably 50 mJ / cm 2 to 2,000 mJ / cm 2 , more preferably 100 mJ / cm 2 to 1,000 mJ / cm 2 When the cumulative light amount is less than the above range, the curing of the polymerizable liquid-crystalline compound becomes insufficient. Conversely, when the cumulative light amount is more than the above range, the elliptically polarizing plate including the optically anisotropic layer sometimes becomes colored.

[0264] [Display device]

[0265] In the present application, as one of the embodiments, a display device including the phase difference plate of the present application can be provided. In addition, the above display device can include the elliptically polarizing plate related to the above embodiments.

[0266] The above display device is a device having a display mechanism, and includes a light-emitting element or a light-emitting device as a light-emitting source. As the display device, a liquid crystal display device, an organic electroluminescence (EL) display device, an inorganic electroluminescence (EL) display device, a touch panel display device, an electron emission display device (field emission display device (FED), surface-conduction electron-emitter array (SED)), electronic paper (a display device using electronic ink, an electrophoretic element), a plasma display device, a projection display device (grating light valve (GLV) display device, a display device having a digital micromirror device (DMD), and the like), and a piezoelectric ceramic display, and the like can be given.

[0267] The liquid crystal display device includes any of a transmissive liquid crystal display device, a semi-transmissive liquid crystal display device, a reflective liquid crystal display device, a direct-view liquid crystal display device, a projection liquid crystal display device, and the like. These display devices can be display devices that display two-dimensional images, or stereoscopic display devices that display three-dimensional images. In particular, as the display device having the phase difference layer and the polarizing layer of the present application, an organic EL display device and a touch panel display device are preferable.

[0268] Examples

[0269] Hereinafter, the present application will be further explained in detail by Examples and Comparative Examples, but the present application is not limited by these Examples. Unless otherwise specified, "%" and "parts" in the Examples and Comparative Examples are "mass %" and "mass parts".

[0270] The polymer films, the devices, and the measuring methods used in Examples 1 to 6 and Comparative Examples 1 to 2 are described below.

[0271] • As the cycloolefin polymer (COP) film, ZF-14 manufactured by ZEON Corporation was used.

[0272] • As the corona treatment device, AGF-B10 manufactured by Kasuga Electric Machine Co., Ltd. was used.

[0273] • For the corona treatment, the above corona treatment device was used, and the treatment was performed once under the conditions of an output power of 0.3 kW and a treatment speed of 3 m / minute.

[0274] • As the polarized UV light irradiation device, SPOT CURE SP-7 manufactured by USHIO INC. with a polarizing plate unit was used.

[0275] • As the laser microscope, LEXT manufactured by Olympus Corporation was used.

[0276] • As the high-pressure mercury lamp, Unicure VB-15201BY-A manufactured by USHIO INC. was used.

[0277] • The in-plane retardation value and the axis angle of the phase difference layer and the polarizing layer were measured using KOBRA-WPR manufactured by Oji Scientific Instruments.

[0278] • The measurement of the optical characteristics of the polarizing layer was performed using UV-3150 manufactured by Shimadzu Corporation.

[0279] • The film thickness was measured using an ellipsometer (Ellipsometer) M-220 manufactured by JASCO.

[0280] [Preparation of the composition for forming the alignment layers A and B]

[0281] A composition for forming alignment layers A and B was obtained by mixing 5 parts of the following photo-orientable material and 95 parts of cyclopentanone (solvent) as components and stirring the resulting mixture at 80°C for 1 hour. Note that the weight average molecular weight of the following photo-orientable material used in the alignment layer A was 30,000, and the molecular weight of the following photo-orientable material used in the alignment layer B was as described in Table 1.

[0282]

[0283] [Preparation of a composition for forming a phase difference layer]

[0284] A composition for forming a phase difference layer was obtained by mixing the following polymeric liquid crystal compound A, a polyacrylate compound (leveling agent) (BYK-361N; manufactured by BYK-Chemie), and the following polymerization initiator as components.

[0285] Polymeric liquid crystal compound A

[0286]

[0287] The polymeric liquid crystal compound A was manufactured by the method described in Japanese Patent Application Publication No. 2010-31223. The amount of the polyacrylate compound was 0.01 parts with respect to 100 parts of the polymeric liquid crystal compound A.

[0288] As the polymerization initiator, 2-dimethylamino-2-benzyl-1-(4-morpholinophenyl)butan-1-one (Irgacure 369 (Irg369); manufactured by BASF Japan) was added in an amount of 6 parts with respect to 100 parts of the polymeric liquid crystal compound A.

[0289] Further, N-methyl-2-pyrrolidone (NMP) was added as a solvent so that the concentration of the solid components became 13%, and the resulting mixture was stirred at 80°C for 1 hour, thereby obtaining a composition for forming a phase difference layer.

[0290] [Preparation of a composition for forming a polarizing layer]

[0291] A composition for forming a polarizing layer was obtained by mixing the following components and stirring the resulting mixture at 80°C for 1 hour. As the dichroic pigment, an azo-based pigment described in the examples of Japanese Patent Application Publication No. 2013-101328 was used. The polymeric liquid crystal compounds represented by Formulas (1-6) and (1-7) were manufactured by the method described in lub et al., Recl. Trav. Chim. Pays-Bas, 115, 321-328 (1996).

[0292] Polymerizable liquid crystal compound:

[0293]

[0294] Dichroic dye 1:

[0295] Polyazo dye: Compound (1-8) 2.5 parts

[0296]

[0297] Polymerization initiator:

[0298] 2-Dimethylamino-2-benzyl-l-(4-morpholinophenyl)butan-l-one (Irgacure 369; manufactured by Ciba Specialty Chemicals) 6 parts

[0299] Leveling agent:

[0300] Polyacrylate compound (BYK-361N; manufactured by BYK-Chemie)

[0301] 1.2 parts

[0302] Solvent: o-xylene 250 parts

[0303] [Example 1]

[0304] [Manufacture of phase difference layer]

[0305] The orientation layer A forming composition was coated on a COP film (ZF-14-50) manufactured by ZEON Corporation using a bar coater, dried at 80°C for 1 minute, and subjected to polarized UV light exposure using a polarized UV light irradiation device (SPOT CURE SP-7; manufactured by USHIO INC.) at a cumulative light amount of 100 mJ / cm 2 at an axis angle of 45°. The film thickness of the obtained orientation layer A was measured using an ellipsometer, and was found to be 100 nm.

[0306] Next, the phase difference layer forming composition prepared in advance was coated on the orientation layer A using a bar coater, dried at 120°C for 1 minute, and then subjected to UV irradiation from the side of the phase difference layer forming composition-coated surface using a high-pressure mercury lamp (Unicure VB-15201BY-A; manufactured by USHIO INC.) (cumulative light amount at a wavelength of 313 nm in a nitrogen atmosphere: 500 mJ / cm 2 ), whereby a laminate comprising the orientation layer A and the phase difference layer was formed.

[0307] Next, for the laminate including the obtained phase difference layer, one treatment was performed using a corona treatment device (AGF-B10, manufactured by Kasuga Electric Co., Ltd.) under conditions of an output power of 0.3 kW and a treatment speed of 3 m / min. Using a bar coater, the surface on which the treatment had been performed was coated with the composition for forming the orientation layer B, dried at 80°C for 1 minute, and subjected to polarized UV light exposure using a polarized UV light irradiation device (SPOT CURE SP-7; manufactured by USHIO INC.) at an axis angle of 90° and a cumulative light amount of 100 mJ / cm 2 The obtained orientation layer B had a film thickness of 150 nm as measured using an ellipsometer.

[0308] After the composition for forming the polarizing layer was coated using a bar coater, drying was performed in a drying oven set to 120°C for 1 minute, whereby a dried coating film in which the polymerizable liquid crystal compound and the dichroic dye had been oriented was obtained. The dried coating film was naturally cooled to room temperature, and then subjected to irradiation of ultraviolet rays using a high-pressure mercury lamp (Unicure VB-15201BY-A, manufactured by USHIO INC.) (wavelength: 365 nm, cumulative light amount at a wavelength of 365 nm: 1000 mJ / cm 2 ), whereby the polymerizable liquid crystal compound was polymerized, a polarizing layer was produced, and an elliptical polarizing plate including a phase difference layer and a polarizing layer was obtained.

[0309] 〔Measurement of phase difference value of elliptical polarizing plate〕

[0310] The in-plane phase difference values at a wavelength of 450 nm, a wavelength of 550 nm, and a wavelength of 650 nm of the obtained elliptical polarizing plate were measured, and the results were Re(450) = 116 nm, Re(550) = 140 nm, and Re(650) = 144 nm. The relationship between the in-plane phase difference values was as follows.

[0311] Re(450) / Re(550) = 0.83

[0312] Re(650) / Re(550) = 1.03

[0313] (In the formula, Re(450) represents the in-plane phase difference value with respect to light having a wavelength of 450 nm, Re(550) represents the in-plane phase difference value with respect to light having a wavelength of 550 nm, and Re(650) represents the in-plane phase difference value with respect to light having a wavelength of 650 nm.)

[0314] That is, the phase difference layer A had optical properties represented by the following formulas (1) to (3).

[0315] 100 nm < Re(550) < 160 nm … (1)

[0316] Re(450) / Re(550)≤1.0... (2)

[0317] 1.00≤Re(650) / Re(550)... (3)

[0318] In addition, the slow axis direction of the phase difference layer was 45°, and the absorption axis angle of the polarizing layer was 0°. It is ideal that the angle formed by the slow axis of the phase difference plate and the absorption axis of the polarizing plate used in the circularly polarizing plate is 45°, and it is known that no axis shift has occurred because the angle formed by the slow axis of the phase difference layer of the elliptically polarizing plate and the absorption axis of the polarizing layer is 45°.

[0319] [Measurement of polarizing degree, monomer transmittance]

[0320] The polarizing degree and the monomer transmittance of the obtained elliptically polarizing plate were measured in the following manner. Using a device in which a folder with a polarizing sheet was provided to a spectrophotometer (UV-3150 manufactured by Shimadzu Corporation), the transmittance (T 1 ) in the direction of the transmission axis and the transmittance (T 2 ) in the direction of the absorption axis were measured in the wavelength range of 380 to 680 nm with a step of 2 nm by a double-beam method. The monomer transmittance and the polarizing degree at each wavelength were calculated using the following formulas (p) and (q), and further, the visible light correction monomer transmittance (Ty) and the visible light correction polarizing degree (Py) were calculated by the 2-degree visual field (C light source) of JIS Z 8701, as a result, the monomer transmittance was 42%, and the polarizing degree was 97%, and it was confirmed that these were values useful as a polarizing plate.

[0321] Monomer transmittance (%) = (T 1 + T 2 ) / 2 (p)

[0322] Polarizing degree (%) = {(T 1 - T 2 ) / (T 1 + T 2 )} x 100 (q)

[0323] [Refractive index of elliptically polarizing plate]

[0324] The refractive index of each layer was measured in accordance with JIS K7142 using a refractometer ("Multi-Wavelength Abbe Refractometer DR-M4" manufactured by ATAGO CO., LTD.), and the results are described below.

[0325] Substrate: 1.53

[0326] Orientation film A: 1.55

[0327] Phase difference layer 1.62

[0328] Orientation film B 1.55

[0329] Polarizing layer 1.54

[0330] [Examples 2 to 6]

[0331] In the formation of the orientation layer B, the film thickness of the orientation layer B was adjusted by changing the thickness of the wire bar when the photo-orientation material was applied using a bar coater, and otherwise, the same operation as in Example 1 was performed to produce an elliptical polarizing plate.

[0332] [Comparative Examples 1 and 2]

[0333] In the formation of the orientation layer B, the film thickness of the orientation layer B was adjusted by changing the thickness of the wire bar when the photo-orientation material was applied using a bar coater, and otherwise, the same operation as in Example 1 was performed to produce an elliptical polarizing plate.

[0334] The results obtained by measuring the optical properties of the polarizing layer described in the above examples and comparative examples are shown in Table 1.

[0335]

[0336] The elliptical polarizing plate of the examples can be produced without causing the occurrence of the axis deviation and orientation defects of the polarizing layer.

Claims

1. An elliptically polarizing plate which is an elliptically polarizing plate having an alignment layer A, a phase difference layer, an alignment layer B, and a polarizing layer provided in this order on a transparent substrate, the elliptically polarizing plate has an ellipticity of 79% or more at a wavelength of 550 nm, the optical axis of the polarizing layer and the phase difference layer are not substantially in parallel relation, the angle formed by the optical axis of the polarizing layer and the phase difference layer is in the range of 43° to 47°, the phase difference layer is a film composed of a polymer of a polymerizable liquid crystal compound, the phase difference layer is a layer formed immediately below the alignment layer B, the alignment layer B is a film having a thickness of 150 nm to 800 nm, the polarizing layer is formed by aligning a dichroic dye in a film composed of a polymer of a polymerizable liquid crystal compound, the elliptically polarizing plate has the alignment layer B after the phase difference layer and has the polarizing layer after the alignment layer B, the phase difference layer satisfies all of the following formulas, 100 nm < Re(550) < 160 nm... (1) Re(450) / Re(550) < 1.0... (2) 1.00 < Re(650) / Re(550)... (3) Re(450), Re(550), and Re(650) represent in-plane retardations at wavelengths of 450 nm, 550 nm, and 650 nm, respectively. 2.The elliptical polarizing plate of claim 1, wherein, the average refractive index of the transparent substrate, the alignment layer A, the phase difference layer, the alignment layer B, and the polarizing layer is in the range of 1.4 to 1.

7. 3.The elliptical polarizing plate of claim 1 or 2, wherein, the refractive index difference between adjacent layers is 0.2 or less.

4. The elliptical polarizing plate of claim 1 or 2, wherein, the alignment layer A is a photo-alignment film.

5. The elliptical polarizing plate of claim 1 or 2, wherein, the alignment layer A and the alignment layer B are photo-alignment films containing a cinnamoyl group.

6. The elliptical polarizing plate of claim 1 or 2, wherein, the alignment layer A and the alignment layer B are photo-alignment films containing a resin having a weight average molecular weight of 20,000 to 50,000.

7. The elliptical polarizing plate of claim 1 or 2, wherein the polarizing layer is a film composed of a polymer of a smectic liquid crystal state.

8. The elliptical polarizing plate of claim 1 or 2, wherein, the dichroic dye is an azo dye.

9. A liquid crystal display device provided with the elliptically polarizing plate according to any one of claims 1 to 8.

10. An organic EL display device provided with the elliptically polarizing plate according to any one of claims 1 to 9.

11. A method for manufacturing an elliptically polarizing plate which is an elliptically polarizing plate having an alignment layer A, a phase difference layer, an alignment layer B, and a polarizing layer provided in this order on a transparent substrate, the elliptically polarizing plate has an ellipticity of 79% or more at a wavelength of 550 nm, the optical axis of the polarizing layer and the phase difference layer are not substantially in parallel relation, the phase difference layer is a layer formed immediately below the alignment layer B, the alignment layer B is a film having a thickness of 150 nm to 800 nm, the phase difference layer satisfies all of the following formulas, 100 nm < Re(550) < 160 nm... (1) Re(450) / Re(550) < 1.0... (2) 1.00 < Re(650) / Re(550)... (3) Re(450), Re(550), and Re(650) represent in-plane retardations at wavelengths of 450 nm, 550 nm, and 650 nm, respectively, the manufacturing method includes the following steps: Process (1) of coating a composition containing an alignment material A and a solvent on a transparent substrate, drying, and then irradiating polarized UV light to form an alignment layer A; Process (2) of coating a composition containing a polymerizable liquid crystal compound, a polymerization initiator, and a solvent on the alignment layer A, drying, and then irradiating UV light to polymerize in a liquid crystal state, thereby forming a phase difference layer; Process (3) of coating a composition containing an alignment material B and a solvent, drying, and then irradiating polarized UV light to form an alignment layer B; and Process (4) of coating a composition containing a polymerizable liquid crystal compound, a dichroic pigment, a polymerization initiator, and a solvent on the alignment layer B, drying, and then irradiating UV light to polymerize in a liquid crystal state, thereby forming a polarizing layer.

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