Circularly polarizing plate and organic electroluminescent display device

Abstract

The present invention addresses the problem of providing: a circularly polarizing plate that makes it possible to improve both the impact resistance and display performance of an organic EL display device which does not have a protective glass on a surface thereof; and an organic EL display device. The present invention provides a circularly polarizing plate that is used for an organic EL display device which does not have a protective glass on a surface thereof, said circularly polarizing plate comprising: at least a polarizer, a resin film, and a liquid crystal cured layer in this order; at least a polarizer, a liquid crystal cured layer, and a resin film in this order; or at least a polarizer, a resin film, a liquid crystal cured layer, and a resin film in this order, wherein the resin film has one or more resin layers, the liquid crystal cured layer has one or more optically anisotropic layers in which the alignment state of a liquid crystal composition containing a polymerizable liquid crystal compound is fixed, the thickness of the resin film is not less than 60 μm, and retardation in the resin film in the thickness direction at a wavelength of 550 nm is -110 to 110 nm.

Description

Circular polarizer and organic electroluminescent display device

[0001] The present invention relates to a circular polarizer and an organic electroluminescent display device.

[0002] Circular polarizers have been used in organic electroluminescence (EL) display devices to suppress adverse effects caused by reflection of external light.

[0003] As such a circular polarizing plate, for example, Patent Document 1 describes a circular polarizing plate having a polarizer and a retardation film having a positive A plate and a positive C plate ([Claim 1]), and describes an embodiment in which both the positive A plate and the positive C plate are liquid crystal cured layers (see

[0024]

[0067] [Example 1], etc.).

[0004] International Publication No. 2018 / 174015

[0005] In recent years, organic EL display devices that do not have a protective glass covering the surface of the display device have been attracting attention from the viewpoints of light weight, toughness (resistance to breakage), thin film processability (ability to be thinned), etc. The present inventors investigated a design that does not have a protective glass on the surface of the organic EL display device described in Patent Document 1, and found that there is room for improvement in impact resistance, and that it is difficult to achieve both impact resistance and excellent display performance.

[0006] Therefore, an object of the present invention is to provide a circular polarizing plate and an organic EL display device that can improve both the impact resistance and display performance of an organic EL display device that does not have a protective glass on its surface.

[0007] As a result of extensive research aimed at achieving the above object, the present inventors have found that the impact resistance and display performance of an organic EL display device that does not have a protective glass on its surface can be improved by using a circular polarizing plate that has at least a polarizer, a resin film, and a cured liquid crystal layer, in this order, or at least a polarizer, a resin film, a cured liquid crystal layer, and a resin film, in this order, wherein the resin film has a thickness of 60 μm or more and a thickness direction retardation of −110 to 110 nm at a wavelength of 550 nm. This finding led to the completion of the present invention. That is, the present inventors have found that the above object can be achieved by the following configuration.

[0008] [1] A circular polarizing plate used in an organic EL display device having no protective glass on its surface, the circular polarizing plate having at least a polarizer, a resin film, and a liquid crystal cured layer in this order, or at least a polarizer, a liquid crystal cured layer, and a resin film in this order, or at least a polarizer, a resin film, a liquid crystal cured layer, and a resin film in this order, the resin film having one or more resin layers, the liquid crystal cured layer having one or more optically anisotropic layers in which the alignment state of a liquid crystal composition containing a polymerizable liquid crystal compound is fixed, the resin film having a thickness of 60 μm or more, and the resin film having a retardation in the thickness direction at a wavelength of 550 nm of −110 to 110 nm.

[0023] Here, when the circularly polarizing plate has at least a polarizer, a resin film, a cured liquid crystal layer, and a resin film in this order, the requirements that the thickness of the resin film be 60 μm or more and that the resin film have a thickness direction retardation of −110 to 110 nm at a wavelength of 550 nm are satisfied by at least one of the resin films. [2] The circularly polarizing plate according to [1], wherein the thickness direction retardation of the resin film at a wavelength of 550 nm satisfies the following formula (I): −0.5 × Rth(550) of the cured liquid crystal layer − 60 nm ≦ Rth(550) of the resin film ≦ −0.5 × Rth(550) of the cured liquid crystal layer + 60 nm (I) In formula (I), Rth(550) of the cured liquid crystal layer represents the thickness direction retardation of the optically anisotropic layer including the surface layer of the cured liquid crystal layer on the resin film side at a wavelength of 550 nm. [3] The circularly polarizing plate according to [1] or [2], wherein the resin film has a thickness of more than 100 μm. [4] The circularly polarizing plate according to [1] or [2], comprising at least a polarizer, a resin film, a liquid crystal cured layer, and a resin film, in this order, and wherein the total thickness of the two resin films is more than 100 μm. [5] The circularly polarizing plate according to any one of [1] to [3], wherein the resin film has a thickness direction retardation of -100 to 90 nm at a wavelength of 550 nm. [6] The circularly polarizing plate according to any one of [1] to [5], wherein the resin film consists of three layers: a first resin layer, a pressure-sensitive adhesive layer or bonding layer, and a second resin layer.[7] Frequency of 1.0 x 10 at a measurement temperature of the adhesive layer of 25°C. ６ [8] The circularly polarizing plate according to [6], wherein the storage modulus E' at Hz is 2 GPa or less. ６[9] The circularly polarizing plate according to any one of [1] to [7], wherein the storage modulus E' at Hz is 2 GPa or less. [9] The circularly polarizing plate according to any one of [1] to [8], wherein the liquid crystal cured layer has, from the polarizer side, at least a first optically anisotropic layer and a second optically anisotropic layer in this order, and the first optically anisotropic layer and the second optically anisotropic layer are in direct contact with each other.

[10] The circularly polarizing plate according to any one of [1] to [9], wherein the liquid crystal cured layer has, from the polarizer side, at least a first optically anisotropic layer and a second optically anisotropic layer in this order, and the first optically anisotropic layer is a layer in which horizontally aligned rod-shaped liquid crystal compounds or vertically aligned discotic liquid crystal compounds are fixed, and the second optically anisotropic layer is a layer in which twisted rod-shaped liquid crystal compounds with the thickness direction as the helical axis are fixed.

[11] The circular polarizer according to any one of [1] to [9], wherein the liquid crystal cured layer has, from the polarizer side, at least a first optically anisotropic layer and a second optically anisotropic layer in this order, the first optically anisotropic layer is a layer formed by fixing horizontally aligned rod-shaped liquid crystal compounds or vertically aligned discotic liquid crystal compounds, and the second optically anisotropic layer is a layer formed by fixing discotic liquid crystal compounds that are twisted and aligned with a helical axis in the thickness direction.

[12] The circular polarizer according to

[11] , wherein the liquid crystal cured layer has at least a polarizer, a resin film, and a liquid crystal cured layer in this order, and the resin film has a retardation in the thickness direction at a wavelength of 550 nm of 0 to 60 nm.

[13] The circularly polarizing plate according to

[11] , comprising at least a polarizer, a resin film, a cured liquid crystal layer, and a resin film in this order, wherein the resin film located closer to the polarizer has a thickness direction retardation of 0 to 60 nm at a wavelength of 550 nm, and the resin film located farther from the polarizer has a thickness direction retardation of 30 to 90 nm at a wavelength of 550 nm.

[14] An organic electroluminescent display device having no protective glass on its surface, comprising an organic electroluminescent display panel and a circularly polarizing plate disposed on the viewing side of the organic electroluminescent display panel, wherein the circularly polarizing plate is the circularly polarizing plate according to any one of [1] to

[13] .

[0009] According to the present invention, it is possible to provide a circular polarizing plate and an organic EL display device that can improve both the impact resistance and display performance of an organic EL display device that does not have a protective glass on its surface.

[0010] Fig. 1 is a schematic cross-sectional view showing one example of a circular polarizer of the present invention. Fig. 2 is a schematic cross-sectional view showing another example of a circular polarizer of the present invention. Fig. 3 is a schematic cross-sectional view showing another example of a circular polarizer of the present invention. Fig. 4 is a schematic cross-sectional view showing another example of a circular polarizer of the present invention.

[0011] The present invention will be described in detail below. The following description of the constituent elements may be based on a representative embodiment of the present invention, but the present invention is not limited to such an embodiment. In this specification, a numerical range expressed using "to" means a range that includes the numerical values ​​before and after "to" as the upper and lower limits. In this specification, the upper or lower limit of a numerical range described in a stepwise manner may be replaced with the upper or lower limit of another stepwise manner. In this specification, the upper or lower limit of a numerical range described in a stepwise manner may be replaced with a value shown in the Examples. In this specification, each component may be a single substance corresponding to the component, or two or more substances may be used in combination. When two or more substances are used in combination for each component, the content of that component refers to the total content of the substances used in combination, unless otherwise specified. In addition, in this specification, "(meth)acrylate" is a notation representing "acrylate" or "methacrylate", "(meth)acrylic" is a notation representing "acrylic" or "methacrylic", and "(meth)acryloyl" is a notation representing "acryloyl" or "methacryloyl".

[0012] In this specification, Re(λ) and Rth(λ) represent the in-plane retardation and the thickness direction retardation, respectively, at a wavelength λ. Unless otherwise specified, the wavelength λ is 550 nm. In the present invention, Re(λ) and Rth(λ) are values ​​measured at a wavelength λ using an AxoScan (manufactured by Axometrics). Specifically, by inputting the average refractive index ((nx+ny+nz) / 3) and the film thickness (d) into the AxoScan, the following slow axis direction (°) is calculated: Re(λ) = R0(λ) Rth(λ) = ((nx+ny) / 2-nz)×d. Although R0(λ) is displayed as a numerical value calculated by the AxoScan, it means Re(λ).

[0013] [Circular Polarizer] The circular polarizer of the present invention is a circular polarizer used in an organic EL display device that does not have a protective glass on its surface. The circular polarizer of the present invention has at least a polarizer, a resin film, and a cured liquid crystal layer, in this order; a polarizer, a cured liquid crystal layer, and a resin film, in this order; or a polarizer, a resin film, a cured liquid crystal layer, and a resin film, in this order. That is, the circular polarizer of the present invention has any of the layer structures 1 to 3 shown below. In the organic EL display device of the present invention described below, the circular polarizer of the present invention is disposed so that the polarizer is on the viewing side of the organic EL display device, and therefore the order of the above-described layer structure is the order from the viewing side of the organic EL display device. The resin film has one or more resin layers, and the cured liquid crystal layer has one or more optically anisotropic layers in which the alignment state of a liquid crystal composition containing a polymerizable liquid crystal compound is fixed. Furthermore, the thickness of the resin film is 60 μm or more, and the thickness direction retardation of the resin film at a wavelength of 550 nm is −110 to 110 nm. When the circular polarizing plate has layer structure 3 shown below, it is sufficient that at least one of the resin films satisfies the above thickness and retardation. When the circular polarizing plate has layer structure 3 below, it is not considered to fall under layer structure 1 below. Layer structure 1: At least a polarizer, a resin film, and a cured liquid crystal layer are included in this order. Layer structure 2: At least a polarizer, a cured liquid crystal layer, and a resin film are included in this order. Layer structure 3: At least a polarizer, a resin film, a cured liquid crystal layer, and a resin film are included in this order.

[0014] In the present invention, as described above, by using a circular polarizer having any one of the above-described layer structures 1 to 3, in which the resin film has a thickness of 60 μm or more and a thickness direction retardation (Rth(550)) of −110 to 110 nm at a wavelength of 550 nm, it is possible to improve both the impact resistance and display performance of an organic EL display device that does not have a protective glass on its surface. The reason why this effect is exhibited is not clear in detail, but the inventors speculate as follows. That is, since the circular polarizer has the above-described resin film, when the circular polarizer is provided in an organic EL display device, a resin film having a thickness of 60 μm or more is located on the organic EL display panel side of the polarizer, and impacts applied to the polarizer can be mitigated on the organic EL display panel side. This is thought to have improved the impact resistance of an organic EL display device that does not have a protective glass on its surface. Similarly, since the circular polarizer has the above-mentioned resin film, when the circular polarizer is provided in an organic EL display device, the resin film having an Rth(550) of −110 to 110 nm is located on the organic EL display panel side of the polarizer, and the reflectance (reflected light) and color difference in oblique directions are reduced, which is thought to have improved the display performance of the organic EL display device that does not have a protective glass on its surface.

[0015] FIGS. 1 to 4 are schematic cross-sectional views illustrating examples of circular polarizers of the present invention. Note that FIGS. 1 to 4 are schematic views, and the thickness and positional relationships of the various layers do not necessarily correspond to the actual ones. The hard coat layer 1, protective film 2, alignment film 5, and adhesive layer 7 shown in FIGS. 1 to 4 are all optional components. Furthermore, in each of the circular polarizers 11 to 14 shown in FIGS. 1 to 4 , the polarizer 1 is positioned on the viewing side of the organic EL display device. The circular polarizer 11 shown in FIG. 1 includes, in this order, the hard coat layer 1, protective film 2, polarizer 3, resin film 4, alignment film 5, solidified liquid crystal layer 6, and adhesive layer 7. The circular polarizer 12 shown in FIG. 2 includes, in this order, the hard coat layer 1, protective film 2, polarizer 3, alignment film 5, solidified liquid crystal layer 6, resin film 4, and adhesive layer 7. Circularly polarizing plate 13 shown in FIG. 3 has, in this order, hard coat layer 1, protective film 2, polarizer 3, first resin layer 4a, intermediate layer 4c, second resin layer 4b, alignment film 5, liquid crystal solidified layer 6, and adhesive layer 7. Circularly polarizing plate 14 shown in FIG. 4 has, in this order, hard coat layer 1, protective film 2, polarizer 3, resin film 4, alignment film 5, first optically anisotropic layer 6a, second optically anisotropic layer 6b, and adhesive layer 7. Although not shown, the circularly polarizing plate of the present invention may have a resin film at the position of resin film 4 shown in FIGS. 1 and 2 , i.e., may have, in this order, hard coat layer 1, protective film 2, polarizer 3, resin film 4, alignment film 5, liquid crystal solidified layer 6, resin film 4, and adhesive layer 7. The polarizer, resin film, and liquid crystal cured layer, as well as any layer configuration, of the circularly polarizing plate of the present invention will be described in detail below.

[0016] [Polarizer] The polarizer of the circular polarizing plate of the present invention is not particularly limited as long as it has the function of converting light into specific linearly polarized light, and conventionally known absorptive polarizers and reflective polarizers can be used. Examples of absorptive polarizers include iodine-based polarizers, dye-based polarizers using dichroic dyes, and polyene-based polarizers. Iodine-based polarizers and dye-based polarizers include coated polarizers and stretched polarizers, and either type can be used. However, polarizers produced by adsorbing iodine or a dichroic dye onto polyvinyl alcohol and stretching the resulting film are preferred. Furthermore, methods for obtaining polarizers by stretching and dyeing a laminated film having a polyvinyl alcohol layer formed on a substrate are described in Japanese Patent Nos. 5,048,120, 5,143,918, 4,691,205, 4,751,481, and 4,751,486. These known techniques related to polarizers can also be preferably used. As the reflective polarizer, a polarizer in which thin films with different birefringence are laminated, a wire grid polarizer, a polarizer in which a cholesteric liquid crystal having a selective reflection region is combined with a quarter-wave plate, etc. are used. Among them, a polyvinyl alcohol-based resin (-CH ２ A polymer containing —CHOH— as a repeating unit, particularly at least one selected from the group consisting of polyvinyl alcohol and an ethylene-vinyl alcohol copolymer, is preferred.

[0017] In the present invention, the thickness of the polarizer is not particularly limited, but is preferably 3 μm to 60 μm, more preferably 5 μm to 50 μm, and even more preferably 10 μm to 40 μm.

[0018] [Resin Film] The resin film of the circularly polarizing plate of the present invention is a resin film having one or more resin layers. The thickness of the resin film is 60 μm or more, and the Rth(550) of the resin film is −110 to 110 nm. Here, the thickness of the resin film refers to the total thickness of the multiple resin layers when the resin film has multiple resin layers. However, if there is a pressure-sensitive adhesive layer or adhesive layer (hereinafter, these are also collectively referred to as “intermediate layer”) between the resin layers, the thickness of the intermediate layer is also included. Similarly, if the resin film has multiple resin layers, the Rth(550) of the resin film refers to the value of the entire resin film taking into account the multiple resin layers. If there is an intermediate layer between the resin layers, the Rth(550) refers to the value taking into account the intermediate layer.

[0019] <Thickness> As described above, the thickness of the resin film is 60 μm or more. However, to further improve the impact resistance of the organic EL display device, it is preferably greater than 100 μm, more preferably greater than 120 μm, and even more preferably greater than 130 μm. Furthermore, when the circularly polarizing plate of the present invention has at least a polarizer, a resin film, a liquid crystal cured layer, and a resin film in this order, i.e., when it has the above-described layer structure 3, to further improve the impact resistance of the organic EL display device, the total thickness of the two resin films is preferably greater than 100 μm, more preferably greater than 120 μm, and even more preferably greater than 130 μm. Furthermore, the upper limit of the thickness of the resin film is not particularly limited, but is preferably 500 μm or less, and more preferably less than 400 μm. Here, the thickness of the resin film refers to the average thickness measured at any five points when the resin film is cut using a microtome and the cross section is observed under an optical microscope.

[0020] <Rth(550)> As described above, the Rth(550) of the resin film is −110 to 110 nm. However, in order to further improve the display performance of the organic EL display device, it is preferable that the resin film satisfies the following formula (I), and it is more preferable that the resin film satisfies the following formula (II): -0.5 × Rth(550) of the cured liquid crystal layer - 60 nm ≦ Rth(550) of the resin film ≦ -0.5 × Rth(550) of the cured liquid crystal layer + 60 nm (I) -0.5 × Rth(550) of the cured liquid crystal layer - 50 nm ≦ Rth(550) of the resin film ≦ -0.5 × Rth(550) of the cured liquid crystal layer + 50 nm (II) In the above formulas (I) and (II), Rth(550) of the cured liquid crystal layer represents the retardation in the thickness direction at a wavelength of 550 nm of the optically anisotropic layer including the surface layer on the resin film side of the cured liquid crystal layer described below. That is, when the liquid crystal cured layer has only one optically anisotropic layer, Rth(550) of the liquid crystal cured layer represents the retardation in the thickness direction of one optically anisotropic layer at a wavelength of 550 nm, and when the liquid crystal cured layer has two or more optically anisotropic layers, Rth(550) represents the Rth(550) of the optically anisotropic layer constituting the surface layer on the resin film side of the liquid crystal cured layer.

[0021] Furthermore, as described above, the Rth(550) of the resin film is −110 to 110 nm, but for reasons of further improving the display performance of the organic EL display device, it is preferably −100 to 90 nm, more preferably −100 to 60 nm, even more preferably −90 to 50 nm, and particularly preferably −80 to 40 nm.

[0022] <Resin Layer> The resin layer included in the resin film is preferably a polymer film. Examples of materials for the polymer film include cellulose-based polymers, acrylic polymers having acrylic acid ester polymers such as polymethyl methacrylate and lactone ring-containing polymers, thermoplastic norbornene-based polymers, polycarbonate-based polymers, polyester-based polymers such as polyethylene terephthalate and polyethylene naphthalate, styrene-based polymers such as polystyrene and acrylonitrile-styrene copolymers, polyolefin-based polymers such as polyethylene, polypropylene and ethylene-propylene copolymers, vinyl chloride-based polymers, amide-based polymers such as nylon and aromatic polyamides, imide-based polymers, sulfone-based polymers, polyethersulfone-based polymers, polyetheretherketone-based polymers, polyphenylene sulfide-based polymers, vinylidene chloride-based polymers, vinyl alcohol-based polymers, vinyl butyral-based polymers, arylate-based polymers, polyoxymethylene-based polymers, epoxy-based polymers, and polymers obtained by mixing these polymers. Of these, cellulose-based polymers, acrylic-based polymers and polycarbonate-based polymers are preferred, cellulose-based polymers and polycarbonate-based polymers are more preferred, and cellulose-based polymers and polycarbonate-based polymers are even more preferred.

[0023] In the present invention, the resin film preferably comprises three layers: a first resin layer, a pressure-sensitive adhesive layer or bonding layer, and a second resin layer, because this improves the impact resistance of the organic EL display device. Here, the first resin layer and the second resin layer may each independently be the same as the resin layer described above. Furthermore, the pressure-sensitive adhesive layer or bonding layer may be one of those described in the description of the intermediate layer below.

[0024] <Intermediate Layer> When the resin film has a plurality of the above-described resin layers, it may have a pressure-sensitive adhesive layer or a bonding layer as an intermediate layer between the resin layers.

[0025] (Adhesive Layer) The adhesive layer may be made of a resin or an elastomer (including oil-extended rubber).

[0026] Examples of the resin include polystyrene resin, polyamide resin, urethane resin, (meth)acrylate resin (also called (meth)acrylic resin, meaning (meth)acrylic acid ester resin, etc.), and modified resins of these resins. Examples of the urethane resin include urethane-modified polyester resin and urethane resin. Among the above resins, (meth)acrylate resin is preferred.

[0027] Examples of the elastomer include a block (co)polymer of a conjugated diene and a hydrogenated product thereof, and a (meth)acrylic block (co)polymer (meaning, for example, a (co)polymer having a poly(meth)acrylic acid ester as a block unit). ], styrene-based block (co)polymers and hydrogenated products thereof ((co)polymers having a polymer of an aromatic vinyl compound (preferably polystyrene) as a block unit and hydrogenated products thereof, such as a block copolymer of a polymer of an aromatic vinyl compound and a polymer containing a conjugated diene, and a hydrogenated product of a block copolymer of a polymer of an aromatic vinyl compound and a polymer containing a conjugated diene), ethylene-α-olefin-based copolymers, polar-group-modified olefin-based copolymers, elastomers composed of a polar-group-modified olefin-based copolymer and at least one of a metal ion and a metal compound, nitrile-based rubbers such as acrylonitrile-butadiene-based rubber, butyl rubber, acrylic rubber, thermoplastic elastomers such as thermoplastic polyolefin elastomers (TPO), thermoplastic polyurethane elastomers (TPU), thermoplastic polyester elastomers (TPEE), thermoplastic polyamide elastomers (TPAE), and diene-based elastomers (1,2-polybutadiene, etc.), silicone-based elastomers, and fluorine-based elastomers, provided that the conjugated diene block (co)polymers do not contain polystyrene blocks. The elastomer is preferably a (meth)acrylic block (co)polymer or a styrene block (co)polymer, and a hydrogenated product thereof. A preferred example of the (meth)acrylic block (co)polymer is a block copolymer of polymethyl methacrylate and poly-n-butyl acrylate (also referred to as a "PMMA-PnBA block copolymer"). A preferred example of the styrene block (co)polymer and a hydrogenated product thereof is a block copolymer of polystyrene and a polymer containing at least one of isoprene and butadiene, and a hydrogenated product thereof. The polymer containing at least one of isoprene and butadiene may contain, for example, butene as a component other than isoprene and butadiene.Among these, the elastomer is more preferably a hydrogenated product of a (meth)acrylic block (co)polymer or a styrene block (co)polymer, and even more preferably a PMMA-PnBA copolymer or a hydrogenated product of a block copolymer of polystyrene and a polymer containing at least one of isoprene and butadiene.

[0028] The resins or elastomers that may be contained in the adhesive layer may be synthesized by known methods, or commercially available products may be used. Examples of commercially available products include Kuralyte LA1114, Kuralyte LA2140, Kuralyte LA2250, Kuralyte LA2330, Kuralyte LA4285, Hybrar 5127, Hybrar 7311F, Septon 2104, and Septon 2063 (all manufactured by Kuraray Co., Ltd.). The adhesive layer is preferably composed of at least one of the resins and elastomers.

[0029] The weight-average molecular weight of the resin or elastomer is preferably 10,000 to 1,000,000, more preferably 50,000 to 500,000, from the viewpoint of the balance between solubility in solvents and the storage modulus E' described below. When forming an adhesive layer, these resins or elastomers (polymers) can be used alone. Furthermore, as described below, when forming an adhesive layer using various additives in addition to the resin or elastomer, taking into account the storage modulus E' of the adhesive layer described below, the content of the resin or elastomer in the solid content constituting the adhesive layer is preferably 10% by mass or more, more preferably 15% by mass or more, and even more preferably 20% by mass or more. The content of the resin or elastomer is not particularly limited, but is, for example, preferably 99.9% by mass or less, more preferably 95% by mass or less, and even more preferably 90% by mass or less. When forming an adhesive layer using the resin or elastomer described above together with a polymerizable group-containing compound and a polymerization initiator described below, and when forming an adhesive layer using the polymerizable group-containing compound and a polymerization initiator described below without using the resin or elastomer described above, the contents of these constituent materials (resin, elastomer, polymerizable group-containing compound, and polymerization initiator) in the total solid content can be determined by the above description of the resin or elastomer content.

[0030] In addition to the resins or elastomers described above, adhesive layers can also be formed using compositions containing additives such as softeners, plasticizers, lubricants, crosslinking agents, crosslinking aids, photosensitizers, antioxidants, antiaging agents, heat stabilizers, flame retardants, antibacterial agents, antifungal agents, weathering agents, UV absorbers, tackifiers, nucleating agents, pigments, dyes, organic fillers, inorganic fillers, silane coupling agents, and titanium coupling agents, polymerizable group-containing compounds, polymerization initiators, or polymers other than the resins or elastomers described above (hereinafter also referred to as "other polymers"). That is, the adhesive layer may be formed using a resin composition or an elastomer composition. Hereinafter, the composition used to form the adhesive layer is also referred to as an adhesive layer-forming composition.

[0031] The inorganic filler added to the adhesive layer is not particularly limited, but examples thereof include silica particles, zirconia particles, alumina particles, mica, and talc, and these may be used alone or in combination of two or more. From the viewpoint of dispersibility in the adhesive layer, silica particles are preferred.

[0032] The surface of the inorganic filler may be treated with a surface modifier having a functional group capable of bonding to or adsorbing to the inorganic filler in order to enhance its affinity with the resin constituting the adhesive layer. Examples of such surface modifiers include silane, metal alkoxide surface modifiers such as aluminum, titanium, and zirconium, and surface modifiers having anionic groups such as phosphate groups, sulfate groups, sulfonate groups, and carboxylate groups.

[0033] Considering the balance between the storage modulus E' and tan δ in the adhesive layer, which will be described later, the content of the inorganic filler is preferably 1 to 40% by mass, more preferably 5 to 30% by mass, and even more preferably 5 to 15% by mass, of the solid content constituting the adhesive layer. The size (average primary particle size) of the inorganic filler is preferably 10 nm to 100 nm, more preferably 15 to 60 nm. The average primary particle size of the inorganic filler can be determined from an electron microscope photograph. When the particle size of the inorganic filler is equal to or greater than the above-mentioned preferable lower limit, the effect of improving the storage modulus is obtained, while when it is equal to or less than the above-mentioned preferable upper limit, it may not cause an increase in haze. The shape of the inorganic filler may be any of plate-like, spherical, and aspherical.

[0034] Specific examples of inorganic fillers include ELECOM V-8802 (manufactured by JGC Catalysts and Chemicals Co., Ltd., spherical silica fine particles with an average primary particle size of 12 nm), ELECOM Examples of such silica particles include V-8803 (manufactured by JGC Catalysts and Chemicals Ltd., irregular shaped silica particles), MIBK-ST (manufactured by Nissan Chemical Industries, Ltd., spherical silica particles having an average primary particle size of 10 to 20 nm), MEK-AC-2140Z (manufactured by Nissan Chemical Industries, Ltd., spherical silica particles having an average primary particle size of 10 to 20 nm), MEK-AC-4130 (manufactured by Nissan Chemical Industries, Ltd., spherical silica particles having an average primary particle size of 40 to 50 nm), MIBK-SD-L (manufactured by Nissan Chemical Industries, Ltd., spherical silica particles having an average primary particle size of 40 to 50 nm), and MEK-AC-5140Z (manufactured by Nissan Chemical Industries, Ltd., spherical silica particles having an average primary particle size of 70 to 100 nm).

[0035] The tackifier added to the adhesive layer is not particularly limited, but examples thereof include rosin ester resins, hydrogenated rosin ester resins, petrochemical resins, hydrogenated petrochemical resins, terpene resins, terpene phenol resins, aromatic modified terpene resins, hydrogenated terpene resins, and alkylphenol resins. These tackifiers may be used alone or in combination of two or more.

[0036] Considering the balance between the storage modulus E' and tan δ in the adhesive layer, which will be described later, the content of the tackifier is preferably 1 to 80 mass %, more preferably 5 to 70 mass %, of the solid content constituting the adhesive layer.

[0037] Specific examples of tackifiers include Superester A75, A115, and A125 (all rosin ester resins manufactured by Arakawa Chemical Industries, Ltd.), Petrotack 60, 70, 90, 100, 100V, and 90HM (all petrochemical resins manufactured by Tosoh Corporation), YS Polystar T30, T80, T100, T115, T130, T145, and T160 (terpene phenol resins manufactured by Yasuhara Chemical Co., Ltd.), and YS Resin PX800, PX1000, PX1150, and PX1250 (terpene resins manufactured by Yasuhara Chemical Co., Ltd.).

[0038] The softener added to the adhesive layer is not particularly limited, but at least one of the following softeners can be used: mineral oils such as naphthenic, paraffinic, and aromatic; vegetable oils such as castor oil, cottonseed oil, linseed oil, rapeseed oil, soybean oil, palm oil, safflower oil, peanut oil, Japan wax, pine oil, and olive oil; and synthetic softeners for various rubbers and resins. The number-average molecular weight of the softener is preferably 200 or more, more preferably 300 or more, in order to suppress bleed-out, and is preferably 1,000 or less, more preferably 800 or less, in order to suppress stickiness.

[0039] Considering the balance between the storage modulus E' and tan δ in the adhesive layer, which will be described later, the content of the softener is preferably 70 mass % or less, more preferably 10 mass % to 50 mass %, of the solid content constituting the adhesive layer.

[0040] Specific examples of softeners include MORESCO White P-40, P-55, P-60, P-70, P-80, P-100, P-120, P-150, P-200, P-260, and P-350P (all of which are paraffin oils manufactured by MORESCO Corporation), Diana Process Oil NS-24, NS-100, NM-26, and NM-68. , NM-150, NM-280, NP-24, NU-80 and NF-90 (all naphthenic oils manufactured by Idemitsu Kosan Co., Ltd.), and Diana Process Oil AC-12, AC-460, AE-24, AE-50, AE-200, AH-16 and AH-58 (all aromatic oils manufactured by Idemitsu Kosan Co., Ltd.).

[0041] The polymerizable group-containing compound that can be contained in the adhesive layer-forming composition, such as the resin composition or elastomer composition used to form the adhesive layer, may be any of a polymerizable group-containing polymer, a polymerizable group-containing oligomer, and a polymerizable group-containing monomer, or an elastomer (including rubber) having a polymerizable group. Specific examples include commercially available products such as Artcure RA331MB and RA341 (both manufactured by Negami Chemical Industrial Co., Ltd., trade names), Kuraplane UC-102M and 203M (both manufactured by Kuraray Co., Ltd., trade names), and Selm Elastomer SH3400M (manufactured by Advanced Soft Materials Co., Ltd., trade name), as well as the radically polymerizable compounds and cationically polymerizable compounds described below.

[0042] When the resin composition or elastomer composition used to form the adhesive layer contains a polymerizable group-containing compound, it is preferable that this composition further contains a polymerization initiator. Specific examples of the polymerization initiator include the polymerization initiators described below. It is also preferable that the adhesive layer is formed using an adhesive layer-forming composition that does not contain the above-mentioned resin or elastomer, but has at least a polymerizable group-containing compound and a polymerization initiator. Among these, an adhesive layer obtained by curing a composition containing a rubber such as polyisoprene having a radical polymerizable group as the polymerizable group and a polymerization initiator is preferred.

[0043] (Thickness of Adhesive Layer) From the viewpoint of further improving impact absorption, the thickness of the adhesive layer is preferably from 1 μm to 100 μm, more preferably from 5 μm to 80 μm, and even more preferably from 10 μm to 80 μm.

[0044] (Method of Forming the Adhesive Layer) The method of forming the adhesive layer is not particularly limited, and examples thereof include coating, casting (solventless casting and solvent casting), pressing, extrusion, injection molding, casting, and inflation. Specifically, a liquid is prepared by dissolving or dispersing the adhesive layer-constituting material in a solvent, or a melt of the components constituting the impact-absorbing material (specifically, the resin or elastomer, etc.). This liquid or melt is then applied to a resin film, and the solvent is then removed as necessary to form an adhesive layer on the resin film (or the resin film of a resin film with an HC layer). The solvent is not particularly limited, and examples of solvents described in the curable composition for forming an HC layer can be applied. Preferred examples include methyl isobutyl ketone and toluene. The blending ratio of the solvent to the solid content is also not particularly limited and can be adjusted as appropriate. For example, the ratio of the solid content to the total amount of the solvent and the solid content can be 10 to 90% by mass.

[0045] Alternatively, an adhesive layer material can be applied to the release-treated surface of a release sheet that has been subjected to a release treatment in the same manner as described above, dried to form a sheet having an adhesive layer, and the adhesive layer of this sheet can be bonded to a resin film, thereby producing an adhesive layer on the resin film (or the resin film of a resin film with an HC layer).

[0046] When the adhesive layer is composed of a resin, the adhesive layer may be composed of an uncrosslinked resin or at least a partially crosslinked resin. The method for crosslinking the resin is not particularly limited, and examples include electron beam irradiation, ultraviolet irradiation, and methods using a crosslinking agent (e.g., organic peroxide, etc.). When crosslinking the resin by electron beam irradiation, crosslinking can be formed by irradiating the obtained adhesive layer before crosslinking with an electron beam using an electron beam irradiation device. When ultraviolet irradiation is used, crosslinking can be formed by irradiating the obtained adhesive layer before crosslinking with ultraviolet rays using an ultraviolet irradiation device, using a photosensitizer such as a photopolymerization initiator, which is optionally incorporated. Furthermore, when a crosslinking agent is used, crosslinking can be formed by heating the obtained adhesive layer before crosslinking in an air-free atmosphere, such as a nitrogen atmosphere, using a crosslinking agent such as an organic peroxide, and / or a crosslinking aid, which is optionally incorporated. When the polymerizable group-containing compound is contained, it is preferable to form the adhesive layer by crosslinking using any of electron beam irradiation, ultraviolet irradiation, and a crosslinking agent.

[0047] The adhesive layer may be formed from a pressure-sensitive adhesive or an adhesive. Suitable examples of the pressure-sensitive adhesive include rubber-based pressure-sensitive adhesives, acrylic-based pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, vinyl alkyl ether-based pressure-sensitive adhesives, polyvinylpyrrolidone-based pressure-sensitive adhesives, polyacrylamide-based pressure-sensitive adhesives, and cellulose-based pressure-sensitive adhesives. Furthermore, it is preferable to use a transparent, optically isotropic pressure-sensitive adhesive (i.e., an optically transparent pressure-sensitive adhesive (OCA)) similar to those used in ordinary image display devices.

[0048] In the present invention, the adhesive layer as the intermediate layer has a frequency of 1.0×10 at a measurement temperature of 25° C., for the reason that the impact resistance of the organic EL display device is further improved. ６ The storage modulus E' at a frequency of 1.0×10 Hz is preferably 2 GPa or less, more preferably 1.5 GPa or less, and even more preferably 1.0 GPa or less. ６The storage modulus E' in Hz refers to a value measured by the following procedure. Using a dynamic viscoelasticity measuring device (DVA-225 manufactured by ITS Japan Co., Ltd.), a sample of the adhesive layer that has been previously conditioned for 2 hours or more in an atmosphere at a temperature of 25°C and a relative humidity of 60% is measured in the "step temperature increase / frequency dispersion" mode under the following conditions, and then a master curve of the storage modulus versus frequency at 25°C is obtained by editing the "master curve." Next, from the obtained master curve, a measurement is performed at 25°C and a frequency of 1.0 x 10 ６ The storage modulus in Hz is calculated. Sample size: 5 mm x 20 mm Grip distance: 20 mm Set strain: 0.10% Measurement temperature: -100°C to 40°C Temperature increase condition: 2°C / min

[0049] In addition to the base material (adhesive), such an adhesive layer may contain appropriate additives such as conductive particles, thermally expandable particles, crosslinking agents (e.g., isocyanate-based crosslinking agents, epoxy-based crosslinking agents, etc.), tackifiers (e.g., rosin derivative resins, polyterpene resins, petroleum resins, oil-soluble phenolic resins, etc.), plasticizers, fillers, antioxidants, surfactants, ultraviolet absorbers, light stabilizers, and antioxidants.

[0050] (Adhesive Layer) The adhesive layer is a layer that serves to bond resin films together, and is not particularly limited as long as it bonds two resin films together. The adhesive layer is preferably formed using a composition containing a component (adhesive) that exhibits adhesiveness upon drying or reaction. For example, an adhesive layer formed using a composition containing a component that exhibits adhesiveness upon a curing reaction (hereinafter also referred to as a "curable composition") is a cured layer formed by curing such a curable composition. Among these, from the viewpoint of thermal deformation resistance, an ultraviolet-curable adhesive that is cured by ultraviolet irradiation is preferably used.

[0051] A resin can be used as the adhesive. In one embodiment, the adhesive layer can be a layer in which the resin accounts for 50% by mass or more, preferably 70% by mass or more of the layer. As the resin, a single resin or a mixture of multiple resins may be used. When a mixture of resins is used, the proportion of the resin refers to the proportion of the mixture of resins. Examples of the resin mixture include a mixture of a certain resin with a resin having a structure in which the resin is partially modified, and a mixture of a resin obtained by reacting different polymerizable compounds.

[0052] The adhesive may be any adhesive having suitable properties, form, and adhesive mechanism. Specific examples include water-soluble adhesives, UV-curable adhesives, emulsion adhesives, latex adhesives, mastic adhesives, multilayer adhesives, paste-like adhesives, foam adhesives, supported film adhesives, thermoplastic adhesives, hot-melt adhesives, heat-setting adhesives, heat-activated adhesives, heat-seal adhesives, heat-curable adhesives, contact adhesives, pressure-sensitive adhesives, polymerization adhesives, solvent-based adhesives, and solvent-activated adhesives. Of these, water-soluble adhesives and UV-curable adhesives are preferred due to their excellent transparency, adhesiveness, workability, product quality, and economy.

[0053] The water-soluble adhesive may contain natural or synthetic water-soluble components such as proteins, starches, and synthetic resins. Examples of synthetic resins include resol resins, urea resins, melamine resins, polyethylene oxide resins, polyacrylamide resins, polyvinylpyrrolidone resins, polyacrylic acid ester resins, polymethacrylic acid ester resins, polyvinyl alcohol resins, polyacrylic resins, and cellulose derivatives. Among these, water-soluble adhesives containing polyvinyl alcohol resins or cellulose derivatives are preferred due to their excellent adhesive properties when laminating resin films. In other words, the adhesive layer preferably contains polyvinyl alcohol resins or cellulose derivatives. Here, cellulose derivatives refer to modified cellulose. There are no particular limitations on the cellulose derivative, and known cellulose derivatives can be used. For example, HEC (hydroxyethyl cellulose) can be used. The weight-average molecular weight of the resin is preferably 1,000 or more, more preferably 10,000 or more, in order to increase the tensile modulus of elasticity. There is no particular upper limit, but a value of 1,000,000 or less is practical.

[0054] Examples of UV-curable adhesives include active energy ray-curable adhesives such as (meth)acrylate adhesives and cationic polymerization-curable adhesives. (Meth)acrylate refers to acrylate and / or methacrylate. Examples of curable components in (meth)acrylate adhesives include compounds having a (meth)acryloyl group and compounds having a vinyl group. Furthermore, compounds having an epoxy group or an oxetanyl group can also be used as cationic polymerization-curable adhesives. The epoxy group-containing compound is not particularly limited as long as it has at least two epoxy groups in its molecule, and various commonly known curable epoxy compounds can be used. Examples of preferred epoxy compounds include compounds having at least two epoxy groups and at least one aromatic ring in its molecule (aromatic epoxy compounds), and compounds having at least two epoxy groups in its molecule, at least one of which is formed between two adjacent carbon atoms constituting an alicyclic ring (alicyclic epoxy compounds).

[0055] Components that may be optionally contained in the adhesive-containing composition include a crosslinking agent (such as boric acid and Safelink SPM-01 (trade name, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.)) and a durability improver (such as potassium iodide).

[0056] [Liquid Crystal Cured Layer] The liquid crystal cured layer of the circular polarizer of the present invention has one or more optically anisotropic layers in which the alignment state of a liquid crystal composition containing a polymerizable liquid crystal compound (i.e., a liquid crystal compound having a polymerizable group) is fixed. Here, the fixed alignment state refers to a state in which the alignment of the liquid crystal compound is maintained. Specifically, the layer is preferably in a state in which it has no fluidity and can stably maintain the fixed alignment state without causing changes in the alignment state due to external fields or external forces, usually at temperatures of 0 to 50°C, or more severely, in a temperature range of −30 to 70°C. Furthermore, the alignment state of the polymerizable liquid crystal compound in the optically anisotropic layer may be any of horizontal alignment (homogeneous alignment), vertical alignment, tilted alignment, and twisted alignment. Note that the liquid crystal cured layer no longer needs to exhibit liquid crystallinity after the alignment state of the liquid crystal composition is fixed by polymerization (i.e., the optically anisotropic layer). In this specification, "horizontal alignment" refers to a state in which the major surface of the optically anisotropic layer is parallel to the long axis direction of the rod-shaped liquid crystal compound (or the discotic axis in the case of a discotic liquid crystal compound). Strict parallel alignment is not required, but rather refers to an alignment in which the angle between the long axis direction of the rod-shaped liquid crystal compound and the major surface of the optically anisotropic layer is less than 10°. "Vertical alignment" refers to a state in which the molecular axis of the liquid crystal compound (e.g., the long axis in the case of a discotic liquid crystal compound) is perpendicular to the major surface of the optically anisotropic layer and aligned in the same direction (optical uniaxiality). Here, "vertical" does not require strict perpendicular alignment, but refers to an alignment in which the average molecular axis of the liquid crystal compound in the optically anisotropic layer forms an inclination angle of more than 70° with the layer surface. The term "same orientation" does not necessarily mean that the orientation is strictly the same, but means that when the orientations of the slow axes are measured at any 20 positions in the plane, the maximum difference between the slow axis orientations at the 20 positions (the difference between the two slow axis orientations with the largest difference among the 20 slow axis orientations) is less than 10°. The term "twisted orientation" means that the rod-shaped or discotic liquid crystal compound is twisted around the thickness direction as the rotation axis (spiral axis), and is intended to mean that the liquid crystal compound is twisted from one main surface to the other main surface of the optically anisotropic layer.Accordingly, the orientation direction (in-plane slow axis direction) of the liquid crystal compound varies depending on the position in the thickness direction of the layer formed by fixing the liquid crystal compound in a twisted orientation with the thickness direction as the helical axis. The twist angle of the rod-shaped liquid crystal compound (the twist angle of the orientation direction of the liquid crystal compound) is not particularly limited, and is often greater than 0° and not greater than 360°, preferably within the range of 80±30° (within the range of 50 to 110°), and more preferably within the range of 80±20° (within the range of 60 to 100°). Similarly, the twist angle of the discotic liquid crystal compound is not particularly limited, and is preferably 81±10° (within the range of 71 to 91°), and more preferably 81±8° (within the range of 73 to 89°). The twist angle is measured using an Axometrics AxoScan (polarimeter) device and the company's device analysis software.

[0057] Polymerizable liquid crystal compounds can be classified into rod-shaped and discotic types based on their shape. Each type is further divided into low-molecular-weight and high-molecular-weight types. A high-molecular-weight compound generally refers to a compound with a degree of polymerization of 100 or more (see "Polymer Physics: Phase Transition Dynamics," by Masao Doi, p. 2, Iwanami Shoten, 1992). While any liquid crystal compound can be used in the present invention, rod-shaped or discotic liquid crystal compounds (discotic liquid crystal compounds) are preferred.

[0058] The polymerizable group of the polymerizable liquid crystal compound is not particularly limited, but is preferably a radically or cationic polymerizable group.The radically polymerizable group may be a known radically polymerizable group, and preferred examples thereof include an acryloyl group or a methacryloyl group.The cationic polymerizable group may be a known cationic polymerizable group, and specific examples thereof include an alicyclic ether group, a cyclic acetal group, a cyclic lactone group, a cyclic thioether group, a spiro orthoester group, and a vinyloxy group.Among these polymerizable groups, an epoxy group, an acryloyl group, or a methacryloyl group is preferred.

[0059] As the rod-shaped liquid crystal compound, for example, those described in claim 1 of JP-A-11-513019 or paragraphs

[0026] to

[0098] of JP-A-2005-289980 are preferred, and as the discotic liquid crystal compound, those described in paragraphs

[0020] to

[0067] of JP-A-2007-108732 or paragraphs

[0013] to

[0108] of JP-A-2010-244038 are preferred. Note that, for both the rod-shaped liquid crystal compound and the discotic liquid crystal compound, only one type may be used, or two or more types may be used in combination.

[0060] As the polymerizable liquid crystal compound, a liquid crystal compound having reverse wavelength dispersion can be used. Here, in this specification, the term "reverse wavelength dispersion" refers to a liquid crystal compound that, when the in-plane retardation (Re) value of a retardation film produced using the compound is measured at a specific wavelength (visible light range), has a constant or higher Re value as the measured wavelength increases.

[0061] The reverse wavelength dispersion liquid crystal compound is not particularly limited as long as it can form a reverse wavelength dispersion film as described above, and examples thereof include compounds represented by the general formula (I) described in JP-A-2008-297210 (particularly, the compounds described in paragraphs

[0034] to

[0039] ), compounds represented by the general formula (1) described in JP-A-2010-084032 (particularly, the compounds described in paragraphs

[0067] to

[0073] ), and compounds represented by the general formula (1) described in JP-A-2016-081035 (particularly, the compounds described in paragraphs

[0043] to

[0055] ). Further, JP-A No. 2011-006360, paragraphs

[0027] to

[0100] , JP-A No. 2011-006361, paragraphs

[0028] to

[0125] , JP-A No. 2012-207765, paragraphs

[0034] to

[0298] , JP-A No. 2012-077055, paragraphs

[0016] to

[0345] , WO12 / 141245, paragraphs

[0017] to

[0072] , WO12 / 147904, paragraphs

[0021] to

[0088] , and WO14 / 147904, paragraphs

[0028] to

[0115] of the compounds described in.

[0062] <Layer Having Fixed Vertically Aligned Discotic Liquid Crystal Compound> The in-plane retardation at a wavelength of 550 nm of the layer having fixed vertically aligned discotic liquid crystal compound is preferably 138 to 198 nm, more preferably 148 to 188 nm, in terms of suppressing color and reflectance in oblique directions.

[0063] The angle θ1 between the absorption axis direction of the linear polarizer and the in-plane slow axis of the layer in which a vertically aligned discotic liquid crystal compound is fixed is preferably from 99 to 109°, and more preferably from 101 to 107°, in order to further suppress the imparting of black color.

[0064] The discotic liquid crystal compound may have a polymerizable group. The polymerizable group is not particularly limited, but is preferably the above-mentioned radically polymerizable or cationic polymerizable group, more preferably a polymerizable ethylenically unsaturated group or a ring-polymerizable group, and further preferably a (meth)acryloyl group, a vinyl group, a styryl group, or an allyl group.

[0065] The layer in which a vertically aligned discotic liquid crystal compound is fixed is preferably a layer formed by fixing a discotic liquid crystal compound having a polymerizable group by polymerization, and more preferably a layer formed by fixing a vertically aligned discotic liquid crystal compound having a polymerizable group by polymerization.

[0066] <Layer formed by fixing a discotic liquid crystal compound twist-aligned with the thickness direction as the helical axis> A layer formed by fixing a discotic liquid crystal compound twist-aligned with the thickness direction as the helical axis is a layer formed by fixing a discotic liquid crystal compound twist-aligned with the thickness direction as the helical axis. The layer formed by fixing a discotic liquid crystal compound twist-aligned with the thickness direction as the helical axis is preferably a layer formed by fixing a chiral nematic phase having a so-called helical structure. Note that, when forming the above phase, it is preferable to use a mixture of a liquid crystal compound exhibiting a nematic liquid crystal phase and a chiral agent described below.

[0067] The value of the product Δnd of the refractive index anisotropy Δn of a layer formed by fixing a discotic liquid crystal compound that is twist-oriented with the thickness direction as the helical axis, measured at a wavelength of 550 nm, and the thickness d is preferably 130 to 190 nm, and more preferably 140 to 180 nm, in terms of suppressing color and reflectance in oblique directions. The refractive index anisotropy Δn refers to the refractive index anisotropy of the optically anisotropic layer. The Δnd is measured using an Axometrics AxoScan (polarimeter) device and the device analysis software of the same company.

[0068] The discotic liquid crystal compound may have a polymerizable group as described above. The type of the polymerizable group is not particularly limited, and examples thereof include those described above.

[0069] The layer formed by fixing a discotic liquid crystal compound twist-aligned with the thickness direction as the helical axis is preferably a layer formed by fixing a discotic liquid crystal compound having a polymerizable group by polymerization, more specifically, a layer formed by fixing a discotic liquid crystal compound twist-aligned with the polymerizable group by polymerization.

[0070] The liquid crystal cured layer of the circularly polarizing plate of the present invention preferably has at least a first optically anisotropic layer and a second optically anisotropic layer in this order from the polarizer side, and the first optically anisotropic layer and the second optically anisotropic layer are in direct contact with each other, for the reason that the front reflectance becomes good when the circularly polarizing plate is mounted on an OLED (Organic Light Emitting Diode) panel.

[0071] The liquid crystal cured layer of the circular polarizer of the present invention may have a λ / 4 function by having a single layer or multiple optically anisotropic layers. Examples of such a liquid crystal cured layer include a liquid crystal cured layer having a positive A plate. Furthermore, the liquid crystal cured layer may further have a positive C plate in addition to the positive A plate.

[0072] Here, a positive A plate (positive A plate) and a positive C plate (positive C plate) are defined as follows. When the refractive index in the in-plane slow axis direction of the film (the direction in which the in-plane refractive index is maximum) is nx, the refractive index in the in-plane direction perpendicular to the in-plane slow axis is ny, and the refractive index in the thickness direction is nz, a positive A plate satisfies the relationship of formula (A1), and a positive C plate satisfies the relationship of formula (C1). Note that a positive A plate has a positive Rth, and a positive C plate has a negative Rth. Formula (A1) nx>ny≒nz Formula (C1) nz>nx≒ny Note that the above "≒" encompasses not only the case where both are completely identical, but also the case where both are substantially identical. For a positive A plate, "ny≒nz" ​​includes, for example, when (ny-nz)×d (where d is the film thickness) is -10 to 10 nm, preferably -5 to 5 nm, and "nx≒nz" includes, for example, when (nx-nz)×d is -10 to 10 nm, preferably -5 to 5 nm. For a positive C plate, "nx≒ny" includes, for example, when (nx-ny)×d (where d is the film thickness) is 0 to 10 nm, preferably 0 to 5 nm.

[0073] The liquid crystal cured layer of the circularly polarizing plate of the present invention preferably has an in-plane retardation (Re(550)) of 120 to 150 nm, more preferably 125 to 145 nm at a wavelength of 550 nm. The angle between the in-plane slow axis of the positive A plate and the absorption axis of the polarizer is preferably 35 to 55°.

[0074] Further, the liquid crystal cured layer of the circular polarizer of the present invention may have a first negative uniaxial optically anisotropic layer (A) (particularly preferably an optically anisotropic layer formed by fixing a vertically aligned discotic liquid crystal compound) and a second optically anisotropic layer (B) formed by fixing a rod-shaped liquid crystal compound that is twisted and aligned with the thickness direction as the helical axis. The liquid crystal cured layer may further have a single or multiple optically anisotropic layers such as a C-plate (preferably a layer formed by fixing a vertically aligned rod-shaped liquid crystal compound, i.e., a positive C-plate). For example, the liquid crystal cured layer may have, from the polarizer side, a negative uniaxial optically anisotropic layer, an optically anisotropic layer formed by fixing a rod-shaped liquid crystal compound that is twisted and aligned with the thickness direction as the helical axis, and a C-plate, in this order. Here, the in-plane retardation of the negative uniaxial optically anisotropic layer (A) at a wavelength of 550 nm is preferably 140 to 220 nm. The angle between the in-plane slow axis of the optically anisotropic layer (A) and the absorption axis of the polarizer is preferably 40 to 85°. Here, the value of the product Δnd of the refractive index anisotropy Δn of the optically anisotropic layer (B) obtained by fixing the rod-shaped liquid crystal compound twistedly aligned with the thickness direction as the helical axis, measured at a wavelength of 550 nm, and the thickness d of the optically anisotropic layer (B) is preferably 140 to 220 nm. The angle between the in-plane slow axis of the optically anisotropic layer (A) and the in-plane slow axis of the surface of the optically anisotropic layer (B) facing the optically anisotropic layer (A) is preferably 0 to 20°.

[0075] The liquid crystal cured layer of the circular polarizer of the present invention preferably comprises, from the polarizer side, at least a first optically anisotropic layer and a second optically anisotropic layer, in this order. The first optically anisotropic layer is preferably a layer formed by fixing horizontally aligned rod-shaped liquid crystal compounds or a layer formed by fixing vertically aligned discotic liquid crystal compounds, and the second optically anisotropic layer is preferably a layer formed by fixing rod-shaped liquid crystal compounds that are twisted around the thickness direction. The thickness ratio of the first optically anisotropic layer to the second optically anisotropic layer (thickness of the first layer / thickness of the second layer) is not particularly limited, but is often 0.1 to 5.0, more often 0.2 to 3.0. The absolute value of the twist angle of the liquid crystal compound in the second optically anisotropic layer is not particularly limited, but is preferably 60 to 120°, as this is suitable for use in circular polarizers. The twist angle is measured using an Axoscan from Axometrics and the company's instrument analysis software. When the thickness of the first optically anisotropic layer is d1 (nm) and the refractive index anisotropy measured at a wavelength of 550 nm is Δn1, the first optically anisotropic layer preferably satisfies the following formula (1-1): Formula (1-1) 100 nm ≦ Δn1d1 ≦ 240 nm When the thickness of the second optically anisotropic layer is d2 (nm) and the refractive index anisotropy measured at a wavelength of 550 nm is Δn2, the second optically anisotropic layer preferably satisfies the following formula (2-1): Formula (2-1) 100 nm ≦ Δn2d2 ≦ 240 nm

[0076] The liquid crystal cured layer of the circular polarizer of the present invention preferably comprises, from the polarizer side, at least a first optically anisotropic layer and a second optically anisotropic layer, in this order, the first optically anisotropic layer being a layer formed by fixing horizontally aligned rod-shaped liquid crystal compounds or vertically aligned discotic liquid crystal compounds, and the second optically anisotropic layer being a layer formed by fixing a discotic liquid crystal compound that is twisted and aligned with the thickness direction as the helical axis. In the above-mentioned embodiment, it is more preferable that the circular polarizer of the present invention comprises at least a polarizer, a resin film, and a liquid crystal cured layer, in this order, and that the resin film has a retardation of 0 to 60 nm in the thickness direction at a wavelength of 550 nm. Furthermore, in the above-mentioned embodiment, it is more preferable that the circularly polarizing plate of the present invention has at least a polarizer, a resin film, a cured liquid crystal layer, and a resin film in this order, and that the resin film located closer to the polarizer has a thickness direction retardation of 0 to 60 nm at a wavelength of 550 nm, and the resin film located farther from the polarizer has a thickness direction retardation of 30 to 90 nm at a wavelength of 550 nm.

[0077] Examples of methods for forming an optically anisotropic layer include a method in which a liquid crystal composition containing a polymerizable liquid crystal compound is used to achieve a desired alignment state, and then the liquid crystal compound is fixed by polymerization. Here, the polymerization conditions are not particularly limited, but it is preferable to use ultraviolet light in polymerization by light irradiation. The irradiation dose is 10 mJ / cm. ２ ~50 J / cm ２ is preferred, and 20 mJ / cm ２ ~5 J / cm ２ More preferably, 30 mJ / cm ２ ~3 J / cm ２ is more preferably 50 to 1000 mJ / cm ２ In order to accelerate the polymerization reaction, the reaction may be carried out under heating conditions.

[0078] In the present invention, the thickness of the cured liquid crystal layer is not particularly limited, but is preferably 0.5 to 5 μm, and more preferably 1.0 to 4.0 μm.

[0079] [Adhesive Layer] The circularly polarizing plate of the present invention preferably further comprises an adhesive layer in addition to the polarizer, resin film, and cured liquid crystal layer described above. Specifically, as shown in Figures 1 to 4, for the reason that it facilitates attachment to an organic EL display panel in the organic EL display device of the present invention described below, it preferably comprises at least a polarizer, a resin film, a cured liquid crystal layer, and an adhesive layer in this order, or at least a polarizer, a cured liquid crystal layer, a resin film, and an adhesive layer in this order. For the same reason, although not shown, it preferably comprises at least a polarizer, a resin film, a cured liquid crystal layer, a resin film, and an adhesive layer in this order. Note that, hereinafter, such an adhesive layer will also be referred to as an attachment layer in order to distinguish it from an adhesive layer serving as an intermediate layer.

[0080] Examples of such an attachment layer include the same adhesive layer as described above as the intermediate layer. In addition, the attachment layer is preferably a layer having a frequency of 1.0×10 at a measurement temperature of 25° C., because the impact resistance of the organic EL display device is further improved. ６ The storage modulus E' at a frequency of 1.0 × 10 Hz is preferably 2 GPa or less, more preferably 1.5 GPa or less, and even more preferably 1.0 GPa or less. ６ The method for measuring the storage modulus E' in Hz is the same as the method for measuring the storage modulus of the adhesive layer as the intermediate layer.

[0081] [Alignment Film] As shown in FIGS. 1 to 4, the circularly polarizing plate of the present invention preferably has an alignment film as an adjacent layer to the cured liquid crystal layer, from the viewpoint of improving the alignment of the liquid crystal compound in the cured liquid crystal layer.

[0082] Alignment films generally contain a polymer as a main component. Polymer materials for alignment films are described in numerous publications, and many commercially available products are available. The polymer material used in the present invention is preferably polyvinyl alcohol or polyimide, and derivatives thereof. Modified or unmodified polyvinyl alcohol is particularly preferred. Examples of alignment films that can be used in the present invention include those described in International Publication No. 01 / 88574, page 43, line 24 to page 49, line 8; modified polyvinyl alcohols described in paragraphs

[0071] to

[0095] of Japanese Patent No. 3907735; and liquid crystal alignment films formed using liquid crystal aligning agents described in Japanese Patent Laid-Open Publication No. 2012-155308.

[0083] In the present invention, it is also preferable to use a photo-alignment film as the alignment film, because it is possible to prevent deterioration of the surface condition by not contacting the alignment film surface during formation of the alignment film. The photo-alignment film is not particularly limited, but polymer materials such as polyamide compounds and polyimide compounds described in paragraphs

[0024] to

[0043] of WO 2005 / 096041; liquid crystal alignment films formed by liquid crystal aligning agents having photo-alignable groups described in JP 2012-155308 A; product name LPP-JP265CP manufactured by Rolic Technologies, Inc., and the like can be used.

[0084] [Hard Coat Layer] As shown in Figures 1 to 4, the circularly polarizing plate of the present invention preferably has a hard coat layer at a position closest to the viewer's side when placed in an organic EL display device in order to impart physical strength. As the hard coat layer, those described in paragraphs

[0190] to

[0196] of JP2009-98658A can be used.

[0085] [Protective Film] The circularly polarizing plate of the present invention preferably has a protective film between the hard coat layer and the polarizer, as shown in Figures 1 to 4. Examples of the protective film include the same films as the resin films described above.

[0086] [Organic EL Display Device] The organic EL display device of the present invention is an organic electroluminescence display device having no protective glass on its surface, and including an organic EL display panel and the above-described circular polarizer of the present invention arranged on the viewing side of the organic EL display panel. Here, the circular polarizer of the present invention is arranged so that the above-described polarizer is on the viewing side of the organic EL display device. The organic EL display panel is a display panel configured using an organic EL element having an organic light-emitting layer (organic electroluminescence layer) sandwiched between electrodes (cathode and anode), and a known configuration may be adopted.

[0087] The present invention will be described in more detail below with reference to examples. The materials, amounts used, ratios, treatment contents, treatment procedures, etc. shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the examples shown below.

[0088] [Example 1] [Preparation of Cellulose Acylate Film (Resin Film)] The components according to the composition shown in the following cellulose acylate dope (1) were charged into a mixing tank, stirred, and further heated at 90°C for 10 minutes. The resulting composition was then filtered through a filter paper with an average pore size of 34 μm and a sintered metal filter with an average pore size of 10 μm to prepare cellulose acylate dope (1). The solid content of cellulose acylate dope (1) was 23.5% by mass, the amount of plasticizer added was the ratio relative to cellulose acylate, and the solvent was methylene chloride / methanol / butanol = 81 / 18 / 1 (mass ratio).

[0089] ----------------------------------------------- Cellulose acylate dope (1)------------------------------------------------ Cellulose acylate (acetyl substitution degree 2.86, viscosity average polymerization degree 310) 100 parts by mass Ester oligomer A below 8.0 parts by mass Silica particle dispersion (AEROSIL R972, manufactured by Nippon Aerosil Co., Ltd.) 0.1 part by mass Solvent (methylene chloride / methanol / butanol)------------------------------------------------

[0090] Ester oligomer A: condensation product of ethanediol / adipic acid (1 / 1 molar ratio), number average molecular weight 1000, hydroxyl value 112

[0091] The cellulose acylate dope (1) prepared above was cast using a drum film-forming machine. The cellulose acylate dope (1) was cast from a die onto a metal support cooled to 0°C so as to come into contact with the support, and then the resulting web (film) was peeled off. The drum was made of SUS (stainless steel).

[0092] The web (film) obtained by casting was peeled off from the drum, and then dried for 20 minutes in a tenter apparatus in which both ends of the web were clipped with clips while the film was being transported at 30 to 40°C, and then wound up to a thickness of 60 μm, which was used as a cellulose acylate film (resin film) (hereinafter also abbreviated as "tack film").

[0093] [One-Side Saponification Treatment] The cellulose acylate film was passed through a dielectric heating roll at a temperature of 60°C to raise the film surface temperature to 40°C, and then an alkaline solution having the composition shown below was applied to the band surface of the film using a bar coater in an amount of 14 ml / m ２ The coated substrate was then transported for 10 seconds under a steam-type far-infrared heater manufactured by Noritake Co., Ltd. that had been heated to 110° C. Subsequently, pure water was applied at a rate of 3 ml / m using the same bar coater. ２Next, the film was washed with water using a fountain coater and then dried with an air knife three times, and then transported to a drying zone at 70° C. for 10 seconds to prepare a cellulose acylate film that had been saponified on one side.

[0094] Alkaline solution ------------------------------------------------ Potassium hydroxide 4.7 parts by mass Water 15.8 parts by mass Isopropanol 63.7 parts by mass Surfactant SF-1:C １４ H ２９ O (CH ２ CH ２ O) ２０ H 1.0 part by mass Propylene glycol 14.8 parts by mass

[0095] [Formation of alignment film] An alignment film-forming composition having the following composition was continuously applied to the alkali-saponified surface of the cellulose acylate film using a #14 wire bar to form a coating film (first coating film). The first coating film was dried with hot air at 60°C for 60 seconds and then with hot air at 100°C for 120 seconds. The thickness of the alignment film was 0.3 μm.

[0096] ------------------------------------------------------------------ Composition for forming alignment film -------------------------------------------------- 100 parts by mass of modified polyvinyl alcohol P1 (listed below) 7.5 parts by mass of photopolymerization initiator (listed below) Water 2,620 parts by mass Methanol 873 parts by mass ------------------------------------------------------------------

[0097] Modified polyvinyl alcohol P1 (in the formula below, the numerical value for each repeating unit represents the content (mol %) of each repeating unit relative to all repeating units.)

[0098] Photopolymerization initiator

[0099] [Formation of Liquid Crystal Cured Layer (Two-Layer Optically Anisotropic Layer)] The alignment film prepared above was subjected to a continuous rubbing treatment. The longitudinal direction of the long film was parallel to the conveying direction, and the angle between the longitudinal direction of the film (conveying direction) and the rotation axis of the rubbing roller was 78.5°. The longitudinal direction of the film (conveying direction) was set to 90°, and when observed from the film side, the width direction of the film was set as the reference (0°) and clockwise directions were expressed as positive values. The rotation axis of the rubbing roller was positioned at an angle of 11.5°, with the width direction of the film as the reference (0°) and the longitudinal direction of the film as the reference. In other words, the position of the rotation axis of the rubbing roller was rotated 78.5° counterclockwise from the longitudinal direction of the film. The rubbed cellulose acylate film was used as a support, and a liquid crystal composition L1 containing a rod-shaped liquid crystal compound having the following composition was applied using a Giesser coater to form a composition layer (second coating film). The absolute value of the weighted average helical twisting power of the chiral agent in the composition layer was 0.0 μm. －１ It was.

[0100] Liquid Crystal Composition L1 ------------------------------------------------ 80 parts by mass of the following rod-shaped liquid crystal compound (A) 17 parts by mass of the following rod-shaped liquid crystal compound (B) 3 parts by mass of the following polymerizable compound (C) 4 parts by mass of ethylene oxide-modified trimethylolpropane triacrylate (V#360, manufactured by Osaka Organic Chemical Industry Co., Ltd.) 3 parts by mass of photopolymerization initiator (Irgacure 819, manufactured by BASF) 0.47 parts by mass of the following left-handed twisted chiral agent (L2) 0.42 parts by mass of the following right-handed twisted chiral agent (R2) 0.08 parts by mass of the following polymer (A) 78 parts by mass of methyl isobutyl ketone 78 parts by mass of ethyl propionate ----------------------------------------------------------------------------------

[0101] Rod-like liquid crystal compound (A) [a mixture of the following liquid crystal compounds (RA), (RB), and (RC) in a mass ratio of 84:14:2]

[0102] Rod-shaped liquid crystal compound (B)

[0103] Polymerizable compound (C) (In the following formula, Me represents a methyl group.)

[0104] Left-twisted chiral agent (L2)

[0105] Right-twisted chiral agent (R2)

[0106] Polymer (A) [content of the repeating unit on the left side in the following formula: 70% by mass, content of the repeating unit on the right side in the following formula: 30% by mass, weight average molecular weight: 9000]

[0107] Next, the obtained composition layer was heated at 95°C for 60 seconds. This heating caused the rod-shaped liquid crystal compound in the composition layer to be aligned in a predetermined direction. Thereafter, the composition layer was irradiated with ultraviolet light (irradiation dose: 25 mJ / cm) using a 365 nm LED (Light Emitting Diode) lamp (manufactured by Acroedge Co., Ltd.) at 30°C in oxygen-containing air (oxygen concentration: approximately 20% by volume). ２ Subsequently, the obtained composition layer was heated at 95°C for 10 seconds. After that, nitrogen purging was performed to adjust the oxygen concentration to 100 ppm by volume, and the composition layer was irradiated with ultraviolet light (irradiation dose: 500 mJ / cm) using a metal halide lamp (manufactured by Eye Graphics Co., Ltd.) at 80°C. ２), an optically anisotropic layer in which the alignment state of the liquid crystal compound was fixed was formed as the liquid crystal cured layer, and a laminate 1A [layer structure: cellulose acylate film (resin film) / alignment film / liquid crystal cured layer] was produced. The laminate 1A produced by the above procedure was cut parallel to the rubbing direction, and the liquid crystal cured layer was observed from the cross-sectional direction using a polarizing microscope. The thickness of the liquid crystal cured layer was 2.7 μm, and the 1.3 μm-thick region on the cellulose acylate film (resin film) side of the liquid crystal cured layer (the second region (i.e., the first optically anisotropic layer)) was homogeneously aligned without a twist angle, and the liquid crystal compound was twistedly aligned in the 1.4 μm-thick region (the first region (i.e., the second optically anisotropic layer)) on the opposite side of the cellulose acylate film (resin film) of the optically anisotropic layer. The optical properties of the laminate 1A of Example 1 were determined using an Axometrics AxoScan and the company's analysis software (Multi-Layer Analysis). The product (Δn2d2) of the in-plane refractive index difference Δn2 and the thickness d2 at a wavelength of 550 nm in the second region was 179 nm, the twist angle of the liquid crystal compound was 0 °, and the alignment axis angle of the liquid crystal compound relative to the longitudinal direction was -11.5 ° on the support side and -11.5 ° on the side in contact with the first region. In addition, the Rth (550) of the second region (first optically anisotropic layer) is shown in the item "liquid crystal cured layer" in Table 1 below. In addition, the product (Δn1d1) of the in-plane refractive index difference Δn1 and the thickness d1 of the first region at a wavelength of 550 nm was 178 nm, the twist angle of the liquid crystal compound was 79.6°, and the alignment axis angle of the liquid crystal compound relative to the longitudinal direction was −11.5° on the side in contact with the second region and −91.1° on the air side.

[0108] [Fabrication of Outer Film] <Preparation of Hard Coat Layer-Forming Composition> Each component was added according to the formulation described in the following Hard Coat Layer Coating Solution HC-1, and the resulting composition was placed in a mixing tank, stirred, and filtered through a polypropylene filter having a pore size of 0.4 μm to obtain Hard Coat Layer Coating Solution HC-1.

[0109] Hard coat layer coating solution HC-1 ------------------------------------------------ 33.6 parts by mass of A-TMMT (listed below) 1.4 parts by mass of Omnirad 127 (listed below) 35.8 parts by mass of methyl ethyl ketone 29.2 parts by mass of methyl acetate ------------------------------------------------

[0110] A-TMMT: pentaerythritol tetraacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd.) Omnirad 127: photopolymerization initiator (manufactured by IGM Resins Co., Ltd.)

[0111] Next, the hard coat layer coating solution HC-1 was applied onto a substrate (Fujitac TG40UL, manufactured by Fujifilm Corporation) as a protective film using a die coater. After that, the film was dried at 30°C for 90 seconds and then at 60°C for 1 minute, and then irradiated with light at an illuminance of 200 mW / cm using a 160 W / cm air-cooled metal halide lamp (manufactured by Eye Graphics Co., Ltd.) while purging with nitrogen so that the atmosphere had an oxygen concentration of approximately 0.3% by volume. ２ , irradiation amount 60mJ / cm ２ The coating layer was cured by irradiating it with ultraviolet light of 1000 kJ / cm to prepare a protective film with a hard coat layer having a thickness of 8 μm, which was designated as outer film 1.

[0112] [Saponification Treatment] The laminate 1A and outer film 1 prepared above were immersed in a 1.5 mol / L aqueous NaOH solution (saponification solution) maintained at 55°C for 2 minutes, then washed with water, and then immersed in a 0.05 mol / L aqueous sulfuric acid solution at 25°C for 30 seconds, followed by passing the film through a water washing bath for 30 seconds under running water to neutralize the film. The film was then drained three times with an air knife, and after the water was removed, it was allowed to stay in a drying zone at 70°C for 15 seconds to dry, thereby producing a saponified laminate 1A and outer film 1.

[0113] [Preparation of Polarizer] According to Example 1 of JP-A No. 2001-141926, iodine was adsorbed onto a stretched polyvinyl alcohol film to prepare a polarizer having a thickness of 26 μm.

[0114] [Preparation of Circularly Polarizing Plate] The cellulose acylate film (resin film) side of the saponified laminate 1A was attached to one side of the polarizer prepared by the above method, with nothing attached to either side, using a polyvinyl alcohol-based adhesive, and the protective film side of the outer film 1 was attached to the other side of the polarizer, followed by drying at 70° C. for 10 minutes or more and laminating to prepare laminate 1B. The layer structure of laminate 1B was hard coat layer / protective film / adhesive / polarizer / adhesive / cellulose acylate film (resin film) / alignment film / liquid crystal cured layer.

[0115] Next, the components were charged into a mixing tank and stirred according to the formulation shown in the following adhesive layer-forming composition CU-1. The resulting composition was filtered through a polypropylene filter with a pore size of 10 μm to obtain adhesive layer-forming composition CU-1.

[0116] -------------------------------------------------- Composition for forming adhesive layer CU-1 -------------------------------------------------- ・25.0 parts by mass of Hybrar 5127 (listed below) ・75.0 parts by mass of toluene -------------------------------------------------- Hybrar 5127: Polystyrene-vinyl polydiene copolymer elastomer manufactured by Kuraray Co., Ltd.

[0117] The adhesive layer-forming composition CU-1 was applied to the surface of the cured liquid crystal layer of the laminate 1B prepared above, and dried to form an adhesive layer, thereby producing a circular polarizer 1 of Example 1. The layer structure of the circular polarizer 1 was hard coat layer / protective film / adhesive / polarizer / adhesive / cellulose acylate film (resin film) / alignment film / cured liquid crystal layer / adhesive layer. The coating and drying methods were specifically as follows. That is, the adhesive layer-forming composition was applied to a film thickness of 50 μm after drying by the die coating method using a slot die described in Example 1 of JP 2006-122889 A at a conveying speed of 30 m / min, and the composition was dried at an atmospheric temperature of 60° C. for 150 seconds to form an adhesive layer.

[0118] Examples 2 to 6 Circularly polarizing plates 2 to 6 of Examples 2 to 6 were produced in the same manner as in Example 1, except that the formulation (type and amount of additive) and thickness of the tack film (resin film) were changed to those shown in Table 1 below. The formulation used in Example 6 used the following cellulose acylate dope (2). The solid content concentration of the cellulose acylate dope (2) was 23.5% by mass, the amount of plasticizer added was the ratio to the cellulose acylate, and the solvent was methylene chloride / methanol / butanol = 81 / 18 / 1 (mass ratio). ----------------------------------------------- Cellulose acylate dope (2)------------------------------------------------ Cellulose acylate (acetyl substitution degree 2.86, viscosity average polymerization degree 310) 100 parts by mass Sugar ester compound 1 (shown in chemical formula (S4)) 6.0 parts by mass Sugar ester compound 2 (shown in chemical formula (S5)) 2.0 parts by mass Silica particle dispersion (AEROSIL R972, manufactured by Nippon Aerosil Co., Ltd.) 0.1 part by mass Solvent (methylene chloride / methanol / butanol)------------------------------------------------

[0119]

[0120]

[0121] Example 7 Tack films of 40 μm and 130 μm thickness were prepared in the same manner as in Example 1, except that the formulation (type and amount of additive) and thickness of the tack film (resin film) were changed to those shown in Table 1 below. The two films were then subjected to the same saponification treatment as in Example 1, and the band surfaces of the two films were then bonded together using the adhesive layer-forming liquid A-1 described below in the manner described below, to obtain a resin film of 171 μm thickness. ------------------------------------------------ Adhesive layer-forming liquid A-1 ------------------------------------------------ - 4.75 parts by mass of HEC described below - 0.25 parts by mass of boric acid - 95.0 parts by mass of water ------------------------------------------------ HEC: Hydroxyethyl cellulose, weight-average molecular weight 391,000

[0122] Specifically, the components were first mixed according to the composition shown in Adhesive Layer Forming Liquid A-1, and the mixture was filtered through a polypropylene filter with a pore size of 10 μm to prepare Adhesive Layer Forming Liquid A-1. Next, the Adhesive Layer Forming Liquid A-1 prepared above was applied to the surface of a 40 μm-thick saponified tack film that had been in contact with the band side so that the adhesive layer would have a thickness of 1 μm after drying. Next, the surface of a 130 μm-thick saponified tack film that had been in contact with the casting band side and the above-mentioned adhesive layer were bonded together using a roller under conditions of a pressure of 3 MPa and a speed of 900 rpm, and then dried at an ambient temperature of 70° C. for 10 minutes or more to produce a resin film in which two saponified tack films were bonded together with an adhesive layer.

[0123] An alignment film and a cured liquid crystal layer were formed on the 130 μm-thick tack film side of the prepared resin film in the same manner as in Example 1. Thereafter, a saponified outer film prepared in the same manner as in Example 1 and the opposite side of the cured liquid crystal layer (saponified side) of the resin film were attached to a polarizer. Next, an attachment layer was provided in the same manner as in Example 1 to prepare a circularly polarizing plate 7 of Example 7. The layer structure of the circularly polarizing plate 7 was as follows: hard coat layer / protective film / adhesive / polarizer / adhesive / cellulose acylate film (thickness: 40 μm) / adhesive layer (thickness: 1 μm) / cellulose acylate film (thickness: 130 μm) / alignment film / cured liquid crystal layer / attachment layer.

[0124] Example 8 Circularly polarizing plate 8 of Example 8 was produced in the same manner as in Example 3, except that in the composition for forming an laminating layer CU-1, a 23 μm-thick adhesive SK-2057 (manufactured by Soken Chemical & Engineering Co., Ltd.) was used instead of Hybler 5127. Specifically, one side of the protective film on both sides of the adhesive SK-2057 was peeled off, the exposed adhesive surface was brought into contact with the optically anisotropic surface, and the two surfaces were laminated by pressing with a rubber roller, and then the protective film on the pressure surface of the rubber roller was peeled off to obtain a circularly polarizing plate.

[0125] [Example 9] The components were charged into a mixing tank and stirred according to the formulation described in the following adhesive layer-forming composition CU-2. The resulting composition was filtered through a polypropylene filter with a pore size of 10 μm to give adhesive layer-forming composition CU-2. A circularly polarizing plate 9 of Example 9 was produced in the same manner as in Example 3, except that the following adhesive layer-forming composition CU-2 was used instead of adhesive layer-forming composition CU-1.

[0126] -------------------------------------------------- Composition for forming adhesive layer CU-2 -------------------------------------------------- ・25.0 parts by mass of Kuraray's Kuraray LA2140 ・75.0 parts by mass of methyl isobutyl ketone -------------------------------------------------- Kuraray's Kuraray LA2140E: PMMA-PnBA copolymer elastomer

[0127] [Examples 10 to 11] Circularly polarizing plates 10 to 11 of Examples 10 to 11 were produced in the same manner as in Example 9, except that the products shown in Table 1 below (see below for details) were used instead of Kuraty LA2140 (manufactured by Kuraray Co., Ltd.) as the composition of the laminating layer. Hybra 7311F: polystyrene-vinyl polydiene copolymer elastomer manufactured by Kuraray Co., Ltd. Septon 2063: styrene-based thermoplastic elastomer manufactured by Kuraray Co., Ltd.

[0128] [Example 12] A 130 μm thick acrylic film having a lactone ring was produced according to the method for producing transparent protective film 2 described in paragraph

[0166] of JP 2009-122663 A. A circularly polarizing plate 12 of Example 12 was produced in the same manner as in Example 3, except that an acrylic film was used as the resin film instead of a tack film.

[0129] [Example 13] Two 60 μm tack films were prepared as in Example 1. Then, the two films were subjected to the same saponification treatment as in Example 1. A 30 μm adhesive layer (Hybler 5127) was formed on the drum surface of one of the films using the same composition as the laminating layer-forming composition CU-1 in Example 1, and the drum surface of the other saponified tack film was attached to produce a resin film (thickness: 150 μm). An alignment film and a liquid crystal cured layer were formed on one of the tack film sides of the prepared resin film in the same manner as in Example 1. Then, a saponified outer film prepared in the same manner as in Example 1 and the opposite side of the liquid crystal cured layer of the resin film (saponified) were attached to a polarizer. Next, an attachment layer was provided in the same manner as in Example 1, and a circularly polarizing plate 13 of Example 13 was produced. The layer structure of the circular polarizer 13 is a hard coat layer / protective film / adhesive / polarizer / adhesive / cellulose acylate film (thickness: 60 μm) / adhesive layer (thickness: 30 μm) / cellulose acylate film (thickness: 60 μm) / alignment film / liquid crystal cured layer / laminating layer.

[0130] [Examples 14 to 19] Circularly polarizing plates 14 to 19 of Examples 14 to 19 were produced in the same manner as in Example 13, except that the thickness of the tack film (resin film), the formulation (type and amount of additive), and the type of adhesive layer were changed to those shown in Table 1 below.

[0131] [Comparative Examples 1 to 4] Circularly polarizing plates H1 to H4 of Comparative Examples 1 to 4 were produced in the same manner as in Example 1, except that the formulation (type and amount of additive) and thickness of the tack film (resin film) were changed to those shown in Table 1 below.

[0132] [Examples 20 to 22 and Comparative Example 5] The formulation (type and amount of additive) and thickness of the tack film (resin film) were changed to those shown in Table 2 below, and in the method for producing the liquid crystal cured layer, the angle between the longitudinal direction of the film (transport direction) and the rotation axis of the rubbing roller was set to 80.7°, and the irradiation amount of a 365 nm LED lamp (manufactured by Acroedge Co., Ltd.) was set to 22 mJ / cm in oxygen-containing air (oxygen concentration: approximately 20% by volume) at 30°C. ２ Circularly polarizing plates 20-22 and H5 of Examples 20-22 and Comparative Example 5 were prepared in the same manner as in Example 1, except that the thickness d2 of the second region was changed to 1. The optical properties of the supported optical film of Example 1 were determined using an Axometrics AxoScan and the company's analysis software (Multi-Layer Analysis). The product (Δn2d2) of the in-plane refractive index difference Δn2 and the thickness d2 at a wavelength of 550 nm in the second region was 173 nm, the twist angle of the liquid crystal compound was 0°, and the alignment axis angle of the liquid crystal compound relative to the longitudinal direction was -9.3° on the support side and -9.3° on the side adjacent to the first region. The Rth(550) of the second region (first optically anisotropic layer) is shown in the "Liquid Crystal Cured Layer" section in Table 2 below. In addition, the product (Δn1d1) of the in-plane refractive index difference Δn1 and the thickness d1 of the first region at a wavelength of 550 nm was 181 nm, the twist angle of the liquid crystal compound was 75.1°, and the alignment axis angle of the liquid crystal compound relative to the longitudinal direction was −9.3° on the side in contact with the second region and −84.4° on the air side.

[0133] Examples 23 to 25 and Comparative Example 6 Circularly polarizing plates 23 to 25 and H6 were produced in the same manner as in Example 1, except that the formulation (type and amount of additive) and thickness of the tack film (resin film) were changed to those shown in Table 2 below, and the alignment film and cured liquid crystal layer were produced by the methods shown below. The layer structure of the circularly polarizing plate 23 and the like was hard coat layer / protective film / adhesive / polarizer / adhesive / cellulose acylate film (resin film) / photo-alignment film / cured liquid crystal layer (positive A plate) / lamination layer.

[0134] [Preparation of Positive A Plate] <Preparation of Photo-Alignment Film> Coating solution E1 for forming a photo-alignment film having the following composition was continuously applied with a wire bar onto a tack film prepared according to the formulation (types and amounts of additives) shown in Table 2 below, to a thickness shown in Table 2 below. The tack film on which the coating film was formed was dried with hot air at 140°C for 120 seconds, and then the coating film was irradiated with polarized ultraviolet light (10 mJ / cm ２ , an ultra-high pressure mercury lamp was used) to form a photo-alignment film E1 with a thickness of 0.2 μm, and a tack film with a photo-alignment film was obtained. ------------------------------------------------ Coating liquid E1 for forming photo-alignment film ------------------------------------------------ - 100.00 parts by mass of polymer PA-2 shown below - 6.00 parts by mass of acid generator TAG-1 shown below - 0.60 parts by mass of diisopropylethylamine - 625.4 parts by mass of butyl acetate - 156.3 parts by mass of methyl ethyl ketone ------------------------------------------------

[0135] Polymer PA-2 (weight average molecular weight: 35,000; in the following formula, the numerical value for each repeating unit represents the content (% by mass) of each repeating unit relative to all repeating units).

[0136] Acid generator TAG-1

[0137] A composition F1 for forming a positive A plate having the following composition was applied onto the photo-alignment film E1 using a bar coater. The coating film formed on the photo-alignment film E1 was heated to 120°C with hot air, then cooled to 60°C, and then irradiated with 100 mJ / cm2 at a wavelength of 365 nm using a high-pressure mercury lamp in a nitrogen atmosphere. ２ The coating film was irradiated with ultraviolet light of 500 mJ / cm 2 while being heated to 120°C. ２ The coating film was irradiated with ultraviolet light of 1000 nm, thereby fixing the alignment of the liquid crystal compound, and an optically anisotropic layer F1 (positive A plate) was produced. The thickness of the positive A plate was 2.5 μm, Re(550) was 141 nm, and the alignment axis angle of the liquid crystal compound relative to the longitudinal direction measured from the tack film side was -45.0°. The positive A plate also satisfied the relationship Re(450)≦Re(550)≦Re(650). Re(450) / Re(550) was 0.82.

[0138] ------------------------------------------------ Composition F1 for forming a positive A plate -------------------------------------------------- 30.00 parts by mass of polymerizable liquid crystal compound LA-1 described below 30.00 parts by mass of polymerizable liquid crystal compound LA-2 described below 27.00 parts by mass of polymerizable liquid crystal compound LA-3 described below 8.00 parts by mass of polymerizable liquid crystal compound LA-4 described below 5.00 parts by mass of polymerizable liquid crystal compound LA-5 described below 0.55 parts by mass of polymerization initiator PI-1 described below 0.06 parts by mass of surfactant KA-1 described below 235.00 parts by mass of cyclopentanone ------------------------------------------------

[0139] Polymerizable liquid crystal compound LA-1 (in the following formula, tBu represents a tert-butyl group)

[0140] Polymerizable liquid crystal compound LA-2

[0141] Polymerizable liquid crystal compound LA-3

[0142] Polymerizable liquid crystal compound LA-4

[0143] Polymerizable liquid crystal compound LA-5 (Me represents a methyl group)

[0144] Polymerization initiator PI-1

[0145] Surfactant KA-1 (in the following formula, the mass fraction (wt%) of the repeating units of the three-branched siloxane part / mesogen part / crosslinking group part is 55 / 40 / 5, and the weight average molecular weight (Mw) is 30,000.)

[0146] Examples 26 to 28 and Comparative Example 7 A liquid crystal cured layer was prepared in the same manner as in Example 23, except that the formulation (type and amount of additive) and thickness of the tack film (resin film) were changed to those shown in Table 2 below, and the direction of polarization of the polarized ultraviolet light irradiation was rotated by 90° so that the alignment axis angle of the liquid crystal compound with respect to the longitudinal direction when measured from the tack film side was 45.0°, and a laminate [layer structure: cellulose acylate film (resin film) / photo-alignment film / liquid crystal cured layer (positive A plate)] was prepared.

[0147] [Preparation of UV adhesive] UV ​​adhesive 1 was prepared having the following composition: --------------------------------------------------- UV adhesive 1 --------------------------------------------------- CEL2021P (manufactured by Daicel Corporation) 70 parts by mass 1,4-butanediol diglycidyl ether 20 parts by mass 2-ethylhexyl glycidyl ether 10 parts by mass CPI-100P (described below) 2.25 parts by mass ---------------------------------------------------

[0148] CPI-100P

[0149] Circular polarizers 26 to 28 and H7 of Examples 26 to 28 and Comparative Example 7 were produced in the same manner as in Example 23, except that the liquid crystal cured layer side of the laminate produced above and a polarizer were attached using the UV adhesive 1. The layer structure of circular polarizer 26, etc., was hard coat layer / protective film / adhesive / polarizer / UV adhesive / liquid crystal cured layer (positive A plate) / photo-alignment film / cellulose acylate film (resin film) / attaching layer.

[0150] [Examples 29 to 31 and Comparative Example 8] Circularly polarizing plates 29 to 31 and H8 of Examples 29 to 31 and Comparative Example 8 were produced in the same manner as in Example 1, except that the formulation (type and amount of additive) and thickness of the tack film (resin film) were changed to those shown in Table 2 below, and the alignment film and the liquid crystal cured layer were produced by the methods shown below.

[0151] [Preparation of Positive C Plate] Composition F2-1 for forming a positive C plate having the following composition was applied onto a tack film (resin film) shown in Table 1 below. Next, the composition was heated with warm air at 40°C for 60 seconds to dry the solvent and ripen the liquid crystal compound into an aligned state. Next, the composition was irradiated with ultraviolet light (300 mJ / cm) at 40°C with an oxygen concentration of 100 ppm under a nitrogen purge. ２ ) was performed to fix the alignment of the liquid crystal compound, and by fixing the alignment state, the liquid crystal compound was vertically aligned, thereby producing an optical film F2-1 having a 0.58 μm thick liquid crystal cured layer (positive C plate). The Rth(550) of the positive C plate was −70 nm.

[0152] -------------------------------- Composition F2-1 for forming a positive C-plate ------------------------------------------------ - 83 parts by mass of the following liquid crystal compound LC-1 - 15 parts by mass of the following liquid crystal compound LC-2 - 2 parts by mass of the following liquid crystal compound LC-3 - 5 parts by mass of urethane monomer (EBECRYL1290, manufactured by Daicel Allnex Corporation) - 5 parts by mass of ethylene oxide-modified trimethylolpropane triacrylate (V#300, manufactured by Osaka Organic Chemical Industry Co., Ltd.) - 4 parts by mass of the following polymerization initiator (IrgacureOXE01, manufactured by BASF) - 1 part by mass of the following vertical alignment liquid crystal compound promoter S01 - 3 parts by mass of the following polymer (MA-1) - 0.4 parts by mass of the following surfactant KA-16 - 33 parts by mass of methyl ethyl ketone - methyl isobutyl ketone 534 parts by mass Ethyl propionate 100 parts by mass

[0153] Liquid crystal compound LC-1

[0154] Liquid crystal compound LC-2

[0155] Liquid crystal compound LC-3

[0156] polymerization initiator

[0157] Vertical alignment liquid crystal compound promoter S01

[0158] Polymer (MA-1) (In the following formula, the numerical value for each repeating unit represents the content (% by mass) of each repeating unit relative to all repeating units. The weight-average molecular weight (Mw) is 60,000.)

[0159] Surfactant KA-16 (In the formula below, the numerical value for each repeating unit represents the content (% by mass) of each repeating unit relative to all repeating units. The weight-average molecular weight (Mw) is 25,000.)

[0160] Furthermore, the surface of the optical film F2-1 (the surface on the positive C-plate F2-1 side) was subjected to corona treatment (treatment amount 1200 Wmin / m ２ ) was carried out to prepare an optical film FC-1.

[0161] [Preparation of Circularly Polarizing Plate] A tack film / photo-alignment film E2 / optically anisotropic layer F1 (positive A plate) was prepared in the same manner as in Example 26, except that the photo-alignment film-forming coating liquid E1 was replaced with the photo-alignment film-forming coating liquid E2 described below. The optically anisotropic layer F1 side was then bonded to a polarizer prepared in the same manner as in Example 1 using UV adhesive 1, and the tack film and photo-alignment film E2 were removed. Next, the surface from which the tack film had been removed was bonded to the positive C plate F2-1 side using UV adhesive 1. Circularly polarizing plates 29 to 31 and H8 of Examples 29 to 31 and Comparative Example 8 were prepared in the same manner as in Example 23, except for the above. The layer structure of the circular polarizer 29, etc. is hard coat layer / protective film / adhesive / polarizer / UV adhesive / optically anisotropic layer F1 (positive A plate) / UV adhesive / optically anisotropic layer (positive C plate) / cellulose acylate film (resin film) / laminating layer.

[0162] -------------------------------------------------- Coating liquid E2 for forming photoalignment film -------------------------------------------------- Copolymer PA-3 (listed below) 100.00 parts by mass Acid generator TAG-1 (listed above) 6.00 parts by mass Diisopropylethylamine 0.60 parts by mass Butyl acetate 625.4 parts by mass Methyl ethyl ketone 156.3 parts by mass --------------------------------------------------

[0163] Copolymer PA-3 (weight average molecular weight: 45000)

[0164] Examples 32 to 34 and Comparative Example 9 Circularly polarizing plates 32 to 33 and H9 of Examples 32 to 34 and Comparative Example 9 were produced in the same manner as in Example 1, except that the formulation (type and amount of additive) and thickness of the tack film (resin film) were changed to those shown in Table 2 below, and the alignment film and the liquid crystal cured layer were produced by the methods shown below. Note that the formulation used in Example 32 used the following cellulose acylate dope (3). The solids concentration of the cellulose acylate dope (3) was 23.5% by mass, the amount of plasticizer added was the ratio to the cellulose acylate, and the solvent was methylene chloride / methanol / butanol = 81 / 18 / 1 (mass ratio). Cellulose acylate dope (3) ------------------------------------------------- Cellulose acylate (acetyl substitution degree 2.86, viscosity average polymerization degree 310) 100 parts by mass Ester oligomer B below 8.0 parts by mass Silica particle dispersion (AEROSIL R972, manufactured by Nippon Aerosil Co., Ltd.) 0.1 part by mass Solvent (methylene chloride / methanol / butanol) -------------------------------------------------

[0165] Ester oligomer (B) [center molecular weight: 750]

[0166] [Preparation of Cured Liquid Crystal Layer (First Optically Anisotropic Layer)] The alignment layer of the cellulose film with an alignment layer prepared in Example 1 was continuously subjected to a rubbing treatment. At this time, the longitudinal direction of the long film was parallel to the conveying direction, and the angle between the longitudinal direction of the film (conveying direction) and the rotation axis of the rubbing roller was 76°. The longitudinal direction of the film (conveying direction) was set to 90°, and when observed from the film side, the width direction of the film was used as the reference (0°) and clockwise directions were expressed as positive values. The rotation axis of the rubbing roller was at an angle of -14°. In other words, the position of the rotation axis of the rubbing roller was rotated 76° counterclockwise from the longitudinal direction of the film.

[0167] Onto the rubbed alignment film, a composition for forming an optically anisotropic layer (1a) containing a discotic liquid crystal compound of the following composition was applied using a Giesser coater to form a composition layer. The resulting composition layer was then heated with hot air at 110°C for 2 minutes to dry the solvent and ripen the alignment of the discotic liquid crystal compound. Subsequently, the resulting composition layer was irradiated with UV light (100 mJ / cm) at 70°C. ２ ) was performed to fix the alignment of the liquid crystal compound, thereby forming an optically anisotropic layer (1a). The thickness of the optically anisotropic layer (1a) was 1.6 μm, and the in-plane retardation at 550 nm was 168 nm. The value obtained by dividing the in-plane retardation at a wavelength of 550 nm by the thickness of the first optically anisotropic layer was 0.105. The average tilt angle of the discotic plane of the discotic liquid crystal compound with respect to the film surface was 90°, confirming that the compound was aligned perpendicular to the film surface. The angle of the slow axis of the optically anisotropic layer (1a) was -14° when viewed from the optically anisotropic layer (1a) side, when the angle was parallel to the rotation axis of the rubbing roller and the width direction of the film was 0° (the longitudinal direction was 90° counterclockwise and -90° clockwise).

[0168] Composition for forming optically anisotropic layer (1a) ------------------------------------------------ 80 parts by mass of discotic liquid crystal compound 1 described below 20 parts by mass of discotic liquid crystal compound 2 described below 0.15 parts by mass of alignment film interface aligning agent 1 described below 0.1 part by mass of fluorine-containing compound A described below 0.05 part by mass of fluorine-containing compound B described below 0.21 parts by mass of fluorine-containing compound C described below 15 parts by mass of ethylene oxide-modified trimethylolpropane triacrylate (V#360, manufactured by Osaka Organic Chemical Industry Co., Ltd.) 6.0 parts by mass of photopolymerization initiator (APi-307, manufactured by Shenzhen UV ChemTech Ltd.) 200 parts by mass of methyl ethyl ketone ------------------------------------------------

[0169] Discotic liquid crystal compound 1

[0170] Discotic liquid crystal compound 2

[0171] Alignment film interface alignment agent 1

[0172] Fluorine-containing compound A (in the following formula, a and b represent the content (% by mass) of each repeating unit relative to all repeating units, a represents 90% by mass and b represents 10% by mass. The weight-average molecular weight was 15,000.)

[0173] Fluorine-containing compound B (The numerical value for each repeating unit represents the content (% by mass) of all repeating units. The weight-average molecular weight was 12,500.)

[0174] Fluorine-containing compound C (The numerical value for each repeating unit represents the content (% by mass) of all repeating units. The weight-average molecular weight was 12,500.)

[0175] Photopolymerization initiator (APi-307, manufactured by Shenzhen UV ChemTech Ltd.)

[0176] [Preparation of Cured Liquid Crystal Layer (Second Optically Anisotropic Layer)] An optically anisotropic layer-forming composition (1c) containing a rod-shaped liquid crystal compound having the following composition was applied to the 60 μm-thick cellulose acylate film prepared in Example 1 using a Giesser coater to form a composition layer. Thereafter, both ends of the film were held, and a cooling plate (9°C) was placed on the side of the film on which the coating film was formed so as to be 5 mm away from the film, and a heater (75°C) was placed on the side opposite the side on which the coating film was formed so as to be 5 mm away from the film, and the film was dried for 2 minutes. The film was then heated to 60°C for 1 minute with warm air, and irradiated with a 365 nm UV-LED at an irradiation dose of 100 mJ / cm while nitrogen purging was performed to maintain an atmosphere with an oxygen concentration of 100 ppm or less. ２ The resulting optically anisotropic layer (1c) was irradiated with UV light (ultra-high pressure mercury lamp; UL750; manufactured by HOYA) at room temperature through a wire grid polarizer at a dose of 7.9 mJ / cm. ２ By irradiating the film with light (wavelength: 313 nm), alignment control ability was exerted on the surface. The film thickness of the formed optically anisotropic layer (1c) was 0.6 μm. The in-plane retardation at a wavelength of 550 nm was 0 nm, and the retardation in the thickness direction at a wavelength of 550 nm was −80 nm. The average tilt angle of the long axis direction of the rod-like liquid crystal compound with respect to the film plane was 90°, and it was confirmed that the compound was aligned perpendicular to the film plane.

[0177] ------------------------------------------------ Composition for forming optically anisotropic layer (1c) -------------------------------------------------- Rod-like liquid crystal compound (A) below: 100 parts by mass Polymerizable monomer (A-400, manufactured by Shin-Nakamura Chemical Co., Ltd.) 4.0 parts by mass Polymerization initiator S-1 (oxime type) below: 5.0 parts by mass Photoacid generator D-1 below: 3.0 parts by mass Polymer M-1 below: 2.0 parts by mass Vertical alignment agent S01 below: 2.0 parts by mass Photoaligning polymer A-1 below: Methyl ethyl ketone 42.3 parts by mass Methyl isobutyl ketone 627.5 parts by mass

[0178] Rod-like liquid crystal compound (A) [a mixture of the following liquid crystal compounds (RA), (RB), and (RC) in a mass ratio of 84:14:2]

[0179] Polymerization initiator S-1

[0180] Photoacid generator D-1

[0181] Polymer M-1 (The numerical value for each repeating unit represents the content (% by mass) of all repeating units. The weight-average molecular weight was 58,000.)

[0182] Vertical alignment agent S01

[0183] Photoalignable polymer A-1 (In the following formula, a, b, and c represent the content (% by mass) of each repeating unit relative to all repeating units, with a representing 40% by mass, b representing 25% by mass, and c representing 35% by mass. The weight-average molecular weight was 69,300.)

[0184] [Preparation of Cured Liquid Crystal Layer (Third Optically Anisotropic Layer)] Next, on the prepared optically anisotropic layer (1c), a composition for forming an optically anisotropic layer (1b) containing a rod-shaped liquid crystal compound having the following composition was applied using a Giesser coater, and heated with hot air at 60°C for 60 seconds. Subsequently, the obtained composition layer was irradiated with UV (300 mJ / cm) at 80°C. ２ ) was performed to fix the alignment of the liquid crystal compound, thereby forming an optically anisotropic layer (1b). The thickness of the optically anisotropic layer (1b) was 1.5 μm, Δnd at a wavelength of 550 nm was 165 nm, and the twist angle of the liquid crystal compound was 81°. When the width direction of the film was set to 0° (the longitudinal direction was 90°), the alignment axis angle of the liquid crystal compound when viewed from the optically anisotropic layer (1b) side was 14° on the air side and 95° on the side in contact with the optically anisotropic layer (1c). The alignment axis angle of the liquid crystal compound contained in the optically anisotropic layer was expressed as negative when clockwise (right-handed) and positive when counterclockwise (left-handed), with the width direction of the substrate set to 0° as the reference. The twist angle of the liquid crystal compound is expressed by observing the substrate from the surface side of the optically anisotropic layer, with the orientation axis direction of the liquid crystal compound on the surface side (front side) as the reference, and when the orientation axis direction of the liquid crystal compound on the substrate side (rear side) is clockwise (right-handed), it is negative, and when it is counterclockwise (left-handed), it is positive.

[0185] ------------------------------------------------ Composition for forming optically anisotropic layer (1b) -------------------------------------------------- Rod-shaped liquid crystal compound (A) above 70 parts by mass Rod-shaped liquid crystal compound (B) below 30 parts by mass Ethylene oxide modified trimethylolpropane triacrylate (V#360, manufactured by Osaka Organic Chemical Industry Co., Ltd.) 4 parts by mass Photopolymerization initiator (Irgacure 819, manufactured by BASF) 3 parts by mass Left-handed twisted chiral agent (L1) below 0.50 parts by mass Fluorine-containing compound D below 0.20 parts by mass Methyl isobutyl ketone 126 parts by mass Ethyl propionate 126 parts by mass

[0186] Rod-shaped liquid crystal compound (B)

[0187] Left-handed twisted chiral dopant (L1)

[0188] Fluorine-containing compound D (the content of the left-side repeating unit was 76% by mass, the content of the right-side repeating unit was 24% by mass, and the weight-average molecular weight was 27,500).

[0189] By the above procedure, an optically anisotropic layer (1b-1c) was prepared in which the optically anisotropic layer (1c) and the optically anisotropic layer (1b) were directly laminated on a continuous cellulose acylate film.

[0190] [Preparation of Optical Film] The surface side of the optically anisotropic layer (1a) formed on the long cellulose acylate film prepared above was subjected to a corona discharge treatment. The corona discharge treatment conditions were an output intensity of 2.5 kW, a line speed of 18 m / min, an electrode length of 1.4 m, and a gap distance of 2 mm. The corona-treated surface was coated with the following ultraviolet-curable adhesive (2a) to a film thickness of 1.5 μm. The corona discharge treatment was also performed on the surface side of the optically anisotropic layer (1b) of the optically anisotropic layer (1c-1b) formed on the long cellulose acylate film prepared above. The corona discharge treatment conditions were an output intensity of 5.0 kW, a line speed of 18 m / min, an electrode length of 1.4 m, and a gap distance of 2 mm. The corona-treated surface was coated with the following adhesive (2a) to a film thickness of 1.0 μm. The adhesive (2a) coated on the optically anisotropic layer (1a) and the adhesive (2a) coated on the optically anisotropic layer (1b) were laminated together, heated to 50°C using an IR heater, and irradiated with UV light from both sides of the cellulose acylate film of the laminate to cure the adhesive (2a), followed by thermal drying at 70°C for 3 minutes. This resulted in an optical film (1a-1b-1c) having a layer structure of the optically anisotropic layer (1a), the adhesive layer (2a), and the optically anisotropic layer (1b-1c). In the optical film (1a-1b-1c), the optically anisotropic layer (1b) was disposed on the adhesive layer (2a) side.

[0191] ------------------------------------------------------------------ Adhesive (2a) ------------------------------------------------------------------ Acryloylmorpholine (manufactured by Kojinsha) 40 parts by mass N-hydroxyacrylamide (manufactured by Kojinsha) 40 parts by mass Tripropylene glycol diacrylate (Aronix M-220, manufactured by Toagosei Co., Ltd.) 20 parts by mass Photopolymerization initiator (KAYACURE DETX-S, manufactured by Nippon Kayaku Co., Ltd.) 1.5 parts by mass ------------------------------------------------------------------

[0192] [Preparation of Circularly Polarizing Plate] The surface of the optically anisotropic layer (1c) that had been in contact with the cellulose acylate film was exposed, and the tack film in contact with the optically anisotropic layer (1a) was saponified and attached to a polarizer in the same manner as in Example 1, thereby producing circularly polarizing plates 32 to 33 and H9 of Examples 32 to 33 and Comparative Example 9. The layer structure of the circularly polarizing plate of Example 32 etc. was hard coat layer / protective film / adhesive / polarizer / adhesive / cellulose acylate film (resin film) / alignment film / optically anisotropic layer (1a) / adhesive (2a) / optically anisotropic layers (1b-1c) / attaching layer.

[0193] [Examples 35 to 37 and Comparative Example 10] Circularly polarizing plates 35 to 37 and H10 of Examples 35 to 37 and Comparative Example 10 were produced in the same manner as in Example 1, except that the formulation (type and amount of additive) and thickness of the tack film (resin film) were changed to those shown in Table 2 below, and the cured liquid crystal layer was produced by the method shown below.

[0194] [Preparation of Cured Liquid Crystal Layer] The alignment layer of the cellulose film with an alignment layer prepared in Example 1 was continuously subjected to a rubbing treatment. At this time, the longitudinal direction of the long film was parallel to the conveying direction, and the angle between the longitudinal direction of the film (conveying direction) and the rotation axis of the rubbing roller was 76°. The longitudinal direction of the film (conveying direction) was set to 90°, and when observed from the film side, the width direction of the film was set as the reference (0°) and clockwise directions were expressed as positive values. The rotation axis of the rubbing roller was at an angle of -14°. In other words, the position of the rotation axis of the rubbing roller was a position rotated 76° clockwise from the longitudinal direction of the film. Using the rubbed cellulose acylate film with an alignment layer as a substrate, a composition (1) for forming an optically anisotropic layer containing a discotic liquid crystal compound having the following composition was applied using a Giesser coater to form a composition layer. The absolute value of the weighted average helical twisting power of the chiral agent in the composition layer was 0.0 μm. －１The composition layer obtained was then heated at 95°C for 80 seconds. This heating caused the discotic liquid crystal compound in the composition layer to be aligned in a predetermined direction. Thereafter, the composition layer was irradiated with ultraviolet light (irradiation dose: 14 mJ / cm2) using a 365 nm LED (Light Emitting Diode) lamp (manufactured by Acroedge Co., Ltd.) at 40°C in oxygen-containing air (oxygen concentration: approximately 20% by volume). The composition layer was then heated at 95°C for 40 seconds. Thereafter, nitrogen purging was performed to adjust the oxygen concentration to 100 ppm by volume, and the composition layer was irradiated with ultraviolet light (irradiation dose: 200 mJ / cm2) using a metal halide lamp (manufactured by Eye Graphics Co., Ltd.) at 75°C. ２ ), an optically anisotropic layer in which the alignment state of the liquid crystal compound was fixed was formed as a liquid crystal cured layer. By the above procedure, an optically anisotropic layer (1d-1e) was produced in which an optically anisotropic layer (1e) and an optically anisotropic layer (1d) were directly laminated on a long cellulose acylate film. The laminate produced by the above procedure was cut parallel to the rubbing direction, and the liquid crystal cured layer was observed from the cross-sectional direction using a polarizing microscope. The thickness of the liquid crystal cured layer was 2.7 μm, and a 1.4 μm-thick region (optically anisotropic layer (1d)) on the cellulose acylate film (resin film) side of the liquid crystal cured layer exhibited homogeneous alignment without a twist angle, while a 1.3 μm-thick region (optically anisotropic layer (1e)) on the opposite side of the optically anisotropic layer from the cellulose acylate film (resin film) exhibited a twisted alignment of the liquid crystal compound. The optical properties of the laminate were determined using an AxoScan from Axometrics and its analysis software (Multi-Layer Analysis). The product (Δn2d2) of the in-plane refractive index difference Δn2 and the thickness d2 of the optically anisotropic layer (1d) at a wavelength of 550 nm was 168 nm, the twist angle of the liquid crystal compound was 0°, and the alignment axis angle of the liquid crystal compound relative to the longitudinal direction was −104° on the support side and −104° on the side contacting the third optically anisotropic layer. The product (Δn1d1) of the in-plane refractive index difference Δn1 and the thickness d1 of the optically anisotropic layer (1e) at a wavelength of 550 nm was 165 nm, the twist angle of the liquid crystal compound was 81°, and the alignment axis angle of the liquid crystal compound relative to the longitudinal direction was −104° on the side in contact with the second optically anisotropic layer and −185° on the air side.

[0195] ────────────────────────────────── Optically anisotropic layer forming composition (1) ──────────────────────────────── 80 parts by mass of the following discotic liquid crystal compound 1 20 parts by mass of the following discotic liquid crystal compound 2 1 part by mass of the following alignment film interface aligning agent 0.1 part by mass of the following alignment film interface adhesion agent 1.06 parts by mass of the following left-handed twisted chiral agent 0.1 part by mass of the following right-handed twisted chiral agent 0.18 parts by mass of the following leveling agent B-1 5 parts by mass of the following modified trimethylolpropane triacrylate 2 parts by mass of a photopolymerization initiator (Irgacure 819, manufactured by BASF) 2 parts by mass of the following defoaming agent 105 parts by mass of methyl ethyl ketone ────────────────────────────────

[0196] Discotic liquid crystal compound 1

[0197] Discotic liquid crystal compound 2

[0198] Alignment film interface alignment agent

[0199] Alignment film interface adhesion

[0200] Left-twisted chiral agent (in the formula below, Me represents a methyl group)

[0201] Right-twisted chiral agent

[0202] Leveling agent B-1 (weight average molecular weight: 15,000)

[0203] Modified trimethylolpropane triacrylate

[0204] Antifoaming agents

[0205] [Preparation of Circularly Polarizing Plate] The tack film in contact with the optically anisotropic layer (1d-1e) was saponified and attached to a polarizer in the same manner as in Example 1 to prepare circularly polarizing plates 35-37 and H10 of Examples 35-37 and Comparative Example 10. The layer structure of the circularly polarizing plate of Example 35 etc. was hard coat layer / protective film / adhesive / polarizer / adhesive / cellulose acylate film (resin film) / alignment film / optically anisotropic layer (1d-1e) / attachment layer.

[0206] [Example 38] First, an optically anisotropic layer (1d-1e) was prepared in the same manner as in Example 35, except that the formulation (type and amount of additives) and thickness of the tack film (resin film) were changed to those shown in Table 3. Next, a resin film 2 was prepared by the following method.

[0207] [Formation of Resin Film 2] The following components were charged into a mixing tank and stirred under heating to prepare a cellulose acylate solution having the following composition.

[0208] ─────────────────────────────────── Cellulose acylate solution ───────────────────────────────── Cellulose acylate with an acetylation degree of 60.7 to 61.1%: 100 parts by mass; Triphenyl phosphate (TPP, plasticizer): 7.8 parts by mass; Biphenyl diphenyl phosphate (BDP, plasticizer): 3.9 parts by mass; Methylene chloride (first solvent): 336 parts by mass; Methanol (second solvent): 29 parts by mass; 1-butanol (third solvent): 11 parts by mass ───────────────────────────────

[0209] In another mixing tank, the following retardation-increasing agent (16 parts by mass), methylene chloride (92 parts by mass), and methanol (8 parts by mass) were charged and stirred under heating to prepare a retardation-increasing agent solution. Cellulose acylate solution 2 (474 ​​parts by mass) was mixed with the retardation-increasing agent solution (25 parts by mass), and the mixture was thoroughly stirred to prepare a dope. The amount of the retardation-increasing agent added was 6.0 parts by mass relative to 100 parts by mass of cellulose acylate.

[0210] Retardation increasing agent

[0211] The obtained solution was cast using a band stretching machine. After the film surface temperature on the band reached 40°C, the film was peeled off from the band and dried with hot air at 70°C for 1 minute and then with dry air at 140°C for 10 minutes. The obtained cellulose acylate film (resin film 2) had a thickness of 60 μm, an in-plane retardation Re(550) of 0 nm at a wavelength of 550 nm, and a thickness-direction retardation Rth(550) of 60 nm.

[0212] [Preparation of Circularly Polarizing Plate] In the same manner as in Example 1, the tack film in contact with the optically anisotropic layer (1d-1e) was saponified and then laminated to a polarizer. The affixing layer-forming composition CU-1 was applied to the surface of the optically anisotropic layer of the laminate prepared above and dried to form an affixing layer, and a resin film 2 was then laminated to the laminate. The affixing layer-forming composition CU-1 was then applied to the surface of the resin film 2 and dried to form an affixing layer, thereby producing a circularly polarizing plate 38 of Example 38. The layer structure of the circularly polarizing plate of Example 38 was hard coat layer / protective film / adhesive / polarizer / adhesive / cellulose acylate film (resin film) / alignment film / optically anisotropic layer (1d-1e) / affixing layer / resin film 2 / affixing layer.

[0213] [Examples 39 to 41 and Comparative Example 11] Circularly polarizing plates 39 to 41 and H11 of Examples 39 to 41 and Comparative Example 11 were produced in the same manner as in Example 38, except that the formulation (type and amount of additive) and thickness of the tack film (resin film) and the type and thickness of the attachment layer were changed to those shown in Table 3 below.

[0214] [Evaluation] (1) Storage modulus of adhesive layer Diagonal cuts were made in the circularly polarizing plates produced in Examples 1 to 41 and Comparative Examples 1 to 11 as necessary, and the adhesive layer was peeled off from the cross section using a scraper. The exposed adhesive layer was dissolved or melted in a solvent, and the resulting coating liquid was applied to the release-treated surface of a release-treated release polyethylene terephthalate (PET) sheet so that the thickness after drying would be 40 μm. After drying, the adhesive layer was peeled off from the release PET sheet to prepare a test piece of the adhesive layer. Next, using a dynamic viscoelasticity measuring device (DVA-225 manufactured by ITS Japan Co., Ltd.), the storage modulus was measured at 25°C and a frequency of 1.0 × 10 using the method described above. ６ The storage modulus in Hz was determined.

[0215] (2) Preparation of Organic EL Display Devices and Evaluation of Display Performance <Mounting on Display Device 1> A Vibobook S14X OLED M5402RA manufactured by ASUS, which is a display device without a protective glass on the viewing side, was disassembled, and the circular polarizer was peeled off. The circular polarizers prepared in Examples 1 to 37 and Comparative Examples 1 to 10 were attached to the display device so that the outer film was positioned on the outside. <Mounting on Display Device 2> An iPad (registered trademark) PRO (2024 new model) manufactured by Apple, which is a display device without a protective glass on the viewing side, was disassembled, and the protective glass on the surface was removed. Furthermore, the circular polarizer was peeled off. The circular polarizers prepared in Examples 38 to 41 and Comparative Example 11 were attached to the display device so that the outer film was positioned on the outside.

[0216] <Impact Resistance Test> A ball drop test was conducted on the display device. In the ball drop test, an iron ball (diameter 11.9 mm, weight 6.87 g) was dropped onto the display device from a predetermined height, and damage to the circular polarizer and display performance was confirmed and evaluated according to the following criteria. The results are shown in Tables 1 to 3 below. (Evaluation Criteria) AAAA: No damage even at a height of 65 cm. AAA: No damage at a height of 60 cm, but damage occurred at a height of 65 cm. AA: No damage at a height of 55 cm, but damage occurred at a height of 60 cm. A: No damage at a height of 50 cm, but damage occurred at a height of 55 cm. B: No damage at a height of 40 cm, but damage occurred at a height of 50 cm. C: No damage at a height of 30 cm, but damage occurred at a height of 40 cm. D: No damage at a height of 25 cm, but damage occurred at a height of 30 cm. E: Damage occurred at a height of 25 cm.

[0217] <Evaluation of Display Performance> Display performance was evaluated by the following methods for evaluating oblique color tint, oblique reflectance, and front reflectance. The results are shown in Tables 1 to 3. A rating of C or higher for both oblique color tint and oblique reflectance indicates excellent display performance. (Oblique Color Tint) The organic EL display device was set to display black, and a very bright light source of 20,000 lux was projected onto it from a polar angle of 40° under bright light, and the reflected light was observed from all directions. The azimuth angle dependence of color tint change was evaluated according to the following criteria: AA: No visible color difference. A: Almost no visible color difference. B: A visible color difference was observed, but only very slight. C: A visible color difference was observed, but did not pose a problem in use. D: A visible color difference was observed, below a practical level. E: A visible color difference was so strong that it was unsuitable for use.

[0218] (Oblique Reflectance) The produced organic EL display device was set to display black, and an extremely bright light source of 20,000 lux was projected onto it under bright light from a polar angle of 40°, and the reflected light was observed from all directions. The azimuth angle dependency of the reflectance was evaluated according to the following criteria. These results are shown in Tables 1 to 3 below. AA: No reflected light is visible. A: The reflected light is very weak, and the black appears dense. B: The reflected light is weak and not noticeable. C: The reflected light is somewhat strong, but does not pose a problem in use. D: The reflected light is strong and below a practical level. E: The reflected light is strongly visible and is unsuitable for use.

[0219] (Front Reflectance) The produced organic EL display device was set to display black, and a very bright light source of 20,000 lux was shone on it from the front under bright light, and the reflected light was observed and evaluated according to the following criteria: A: The reflected light was very weak, and the black appeared dense. B: The reflected light was weak and not bothersome.

[0220]

[0221]

[0222]

[0223] The results shown in Tables 1 to 3 indicate that impact resistance is poor when the thickness of the resin film of the circular polarizer is less than 60 μm (Comparative Examples 1 and 2). Furthermore, it was also found that display performance is poor when the Rth(550) of the resin film of the circular polarizer is outside the range of −100 to 110 nm. In contrast, it was found that both the impact resistance and display performance of the organic EL display device can be improved when the thickness of the resin film of the circular polarizer is 60 μm or more and the Rth(550) of the resin film is within the range of −100 to 110 nm (Examples 1 to 41). In particular, the comparison results of Examples 1 to 6 and Examples 20 to 22 indicate that the display performance of the organic EL display device is further improved when the Rth(550) of the resin film satisfies the above-mentioned formula (I). In addition, a comparison between Examples (e.g., Examples 1 to 5) revealed that when the thickness of the resin film is more than 100 μm, the impact resistance of the organic EL display device is further improved. In addition, a comparison between Examples 13 to 19 revealed that the adhesive layer as the intermediate layer has a frequency of 1.0 × 10 at a measurement temperature of 25°C. ６ It was found that when the storage modulus E' at Hz is 2 GPa or less, the impact resistance of the organic EL display device is further improved. Furthermore, a comparison of Examples 3, 20, 23, 26, 29, and 32 revealed that when the liquid crystal cured layer has at least a first optically anisotropic layer and a second optically anisotropic layer in this order from the polarizer side, and the first optically anisotropic layer and the second optically anisotropic layer are in direct contact with each other, the front reflectance becomes good when the liquid crystal display device is mounted on an OLED panel.

[0224] REFERENCE SIGNS LIST 1 Hard coat layer 2 Protective film 3 Polarizer 4 Resin film 4a First resin layer 4b Second resin layer 4c Intermediate layer 5 Alignment film 6 Liquid crystal cured layer 6a First optically anisotropic layer 6b Second optically anisotropic layer 7 Adhesive layer (bonding layer) 11, 12, 13, 14 Circularly polarizing plate

Claims

1. A circular polarizing plate used in an organic EL display device that does not have a protective glass on its surface, comprising at least a polarizer, a resin film, and a cured liquid crystal layer, in this order; or at least a polarizer, a cured liquid crystal layer, and a resin film, in this order; or at least a polarizer, a resin film, a cured liquid crystal layer, and a resin film, in this order; the resin film comprises one or more resin layers; the cured liquid crystal layer comprises one or more optically anisotropic layers in which the alignment state of a liquid crystal composition containing a polymerizable liquid crystal compound is fixed; the resin film has a thickness of 60 μm or more; and the resin film has a retardation in the thickness direction at a wavelength of 550 nm of -110 to 110 nm. Here, when the circularly polarizing plate has at least the polarizer, the resin film, the cured liquid crystal layer, and the resin film in this order, the specification that the thickness of the resin film is 60 μm or more and the specification that the retardation in the thickness direction of the resin film at a wavelength of 550 nm is −110 to 110 nm are both specifications that may be satisfied by at least one of the resin films.

2. The circularly polarizing plate according to claim 1, wherein the resin film has a thickness direction retardation at a wavelength of 550 nm that satisfies the following formula (I): -0.5 × Rth(550) of the cured liquid crystal layer - 60 nm ≦ Rth(550) of the resin film ≦ -0.5 × Rth(550) of the cured liquid crystal layer + 60 nm (I), wherein Rth(550) of the cured liquid crystal layer represents a thickness direction retardation at a wavelength of 550 nm of the optically anisotropic layer including a surface layer of the cured liquid crystal layer on the resin film side.

3. The circularly polarizing plate according to claim 1, wherein the resin film has a thickness of more than 100 μm.

4. The circularly polarizing plate according to claim 1, comprising at least the polarizer, the resin film, the cured liquid crystal layer and the resin film in this order, and the total thickness of the two resin films exceeds 100 μm.

5. The circularly polarizing plate according to claim 1, wherein the resin film has a retardation in the thickness direction at a wavelength of 550 nm of −100 to 90 nm.

6. The circularly polarizing plate according to claim 1, wherein the resin film is composed of three layers: a first resin layer, an adhesive or pressure-sensitive adhesive layer, and a second resin layer.

7. The adhesive layer has a frequency of 1.0 x 10 at a measurement temperature of 25°C. ６ 7. The circularly polarizing plate according to claim 6, having a storage modulus E' at Hz of 2 GPa or less.

8. A polarizer having at least the polarizer, the resin film, the cured liquid crystal layer, and an adhesive layer in this order, or having at least the polarizer, the cured liquid crystal layer, the resin film, and an adhesive layer in this order, or having at least the polarizer, the resin film, the cured liquid crystal layer, the resin film, and an adhesive layer in this order, wherein the adhesive layer has a frequency of 1.0 x 10 at a measurement temperature of 25°C ６ 2. The circularly polarizing plate according to claim 1, wherein the storage modulus E' at Hz is 2 GPa or less.

9. The circular polarizer according to claim 1, wherein the liquid crystal cured layer has at least a first optically anisotropic layer and a second optically anisotropic layer in this order from the polarizer side, and the first optically anisotropic layer and the second optically anisotropic layer are in direct contact with each other.

10. The circular polarizer of claim 1, wherein the liquid crystal cured layer has at least a first optically anisotropic layer and a second optically anisotropic layer in this order from the polarizer side, the first optically anisotropic layer being a layer formed by fixing horizontally aligned rod-shaped liquid crystal compounds or vertically aligned discotic liquid crystal compounds, and the second optically anisotropic layer being a layer formed by fixing twistedly aligned rod-shaped liquid crystal compounds with the thickness direction as the helical axis.

11. The circular polarizer according to claim 1, wherein the liquid crystal cured layer has at least a first optically anisotropic layer and a second optically anisotropic layer in this order from the polarizer side, the first optically anisotropic layer being a layer formed by fixing horizontally aligned rod-shaped liquid crystal compounds or vertically aligned discotic liquid crystal compounds, and the second optically anisotropic layer being a layer formed by fixing discotic liquid crystal compounds that are twisted and aligned with the thickness direction as the helical axis.

12. The circularly polarizing plate according to claim 11, comprising at least the polarizer, the resin film, and the liquid crystal cured layer in this order, wherein the resin film has a retardation in the thickness direction at a wavelength of 550 nm of 0 to 60 nm.

13. The circularly polarizing plate according to claim 11, comprising at least the polarizer, the resin film, the cured liquid crystal layer, and the resin film in this order, wherein the resin film located closer to the polarizer has a thickness direction retardation of 0 to 60 nm at a wavelength of 550 nm, and the resin film located farther from the polarizer has a thickness direction retardation of 30 to 90 nm at a wavelength of 550 nm.

14. An organic electroluminescent display device having no protective glass on its surface, comprising an organic electroluminescent display panel and a circular polarizer disposed on the viewing side of the organic electroluminescent display panel, wherein the circular polarizer is the circular polarizer according to any one of claims 1 to 13.

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