Optical laminate and organic electroluminescence display device having the same

Abstract

To provide an optical laminate capable of suppressing glare while maintaining a good anti-glare property.SOLUTION: An optical laminate 1A is provided, comprising an anti-glare layer 2, anti-glare layer-forming base material layer 3, polarizing film 4, protective film 5, and retardation layer 6 arranged in the described order. The protective film 5, the retardation layer 6, and a member therebetween together have a measured haze of 0.3% or greater, and the anti-flare layer 2 and the anti-glare layer-forming base material layer 3 together have a measured haze less than 5%.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an optical laminate and an organic electroluminescent display device including the same. [Background technology]

[0002] In organic electroluminescence (organic EL) display devices, a circular polarizer is generally attached to the viewing side of the display panel to suppress reflection of external light from electrodes and the like inside the display panel (see, for example, Patent Document 1). This circular polarizer may be provided with an antiglare layer to suppress surface reflection (glare) from the circular polarizer itself. This suppresses reflection on the display surface and improves the visibility of the displayed image. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-51543 Summary of the Invention [Problem to be solved by the invention]

[0004] However, although providing an antiglare layer reduces reflections, it also causes a strong sense of glare in color display in organic electroluminescence (organic EL) display devices. Therefore, an object of the present invention is to provide an optical laminate that can reduce glare while maintaining good antiglare properties. Another object of the present invention is to provide an organic electroluminescence display device equipped with this optical laminate. [Means for solving the problem]

[0005] The present invention provides an optical laminate comprising, in this order, an antiglare layer, a substrate layer for forming the antiglare layer, a polarizing film, a protective film, and a retardation layer, in which the haze measured together with the protective film, the retardation layer, and a member between the protective film and the retardation layer is 0.3% or more, and the haze measured together with the antiglare layer and the substrate layer for forming the antiglare layer is less than 5%.

[0006] As a result of investigations into the above-mentioned problems, the present inventors have concluded that the strong glare felt in color display due to the provision of an antiglare layer in an organic EL display device to which a circular polarizer having a retardation layer is attached is due to the high haze of the antiglare layer, etc. Therefore, they have come up with the idea of ​​preventing glare in the organic EL display device by controlling the haze value of the antiglare layer, etc. within an appropriate range.

[0007] The optical layered body of the present invention preferably has at least one of the following characteristics. The haze measured by combining the antiglare layer and the antiglare layer-forming substrate layer is 0.1% or more and 4.0% or less. The thickness of the substrate layer for forming the antiglare layer is 15 μm to 30 μm. The thickness of the protective film is 15μm to 30μm. The distance between the surface of the antiglare layer-forming substrate layer facing the polarizing film and the surface of the retardation layer opposite the polarizing film is 70 μm or less. The haze measured by combining the protective film, the retardation layer, and the member between the protective film and the retardation layer is 1.3% or less. The substrate layer for forming the antiglare layer and the polarizing film are directly bonded to each other.

[0008] The present invention also provides an organic electroluminescent display device comprising an organic electroluminescent display panel and the above-described optical laminate disposed on the viewing side of the organic electroluminescent display panel. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide an optical laminate that can suppress glare while maintaining good antiglare properties, and also to provide an organic electroluminescence display device including this optical laminate. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a cross-sectional view of an optical laminate according to one embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view of an optical laminate according to another embodiment of the present invention. [Figure 3] 1 is a cross-sectional view of an organic electroluminescence display device according to one embodiment of the present invention. [Figure 4] FIG. 2 is a cross-sectional view of an optical laminate according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals, and redundant explanations will be omitted.

[0012] As shown in Fig. 1, the optical laminate 1A of this embodiment includes, in this order, an antiglare layer 2, an antiglare layer-forming substrate layer 3, a polarizing film 4, a protective film 5, and a retardation layer 6. A first pressure-sensitive adhesive layer 7a and a second pressure-sensitive adhesive layer 7b are provided between the retardation layer 6 and the protective film 5 and on the other surface of the retardation layer 6, respectively. Note that the adhesive layers are not shown in Fig. 1.

[0013] <Polarizing film> Polarizing films are films that exhibit the property of optical absorption anisotropy, and are generally films that contain polarizers or polarizing membranes in which dichroic dyes are uniaxially oriented. To achieve uniaxial orientation of dichroic dyes, they can be produced from a film (hereinafter also referred to as a "polarizer") that is uniaxially stretched while impregnated with iodine or an organic dichroic dye in a polymer such as polyvinyl alcohol (PVA). In other words, the polarizing function is achieved by the anisotropic absorption of light by the dichroic dye encapsulated in the stretched polymer.

[0014] [Polarizer] A polarizer, i.e., a film obtained by uniaxially stretching a polymer such as a polyvinyl alcohol-based resin film impregnated with iodine or an organic dichroic dye, can usually be produced through the steps of uniaxially stretching a polyvinyl alcohol-based resin film, dyeing the polyvinyl alcohol-based resin film with a dichroic dye such as iodine to adsorb the dichroic dye, treating the polyvinyl alcohol-based resin film with a crosslinking agent such as a boric acid aqueous solution, and washing with water after the treatment with the crosslinking agent such as a boric acid aqueous solution. The polarizer may contain a crosslinking agent.

[0015] The thickness of the polarizer is usually 30 μm or less, preferably 18 μm or less, more preferably 15 μm or less, and even more preferably 10 μm or less. The thickness is usually 1 μm or more, for example, 5 μm or more.

[0016] The uniaxial stretching of the polyvinyl alcohol-based resin film can be performed before, simultaneously with, or after dyeing with a dichroic dye. When uniaxial stretching is performed after dyeing, it may be performed before or during the boric acid treatment. Of course, uniaxial stretching can also be performed in multiple stages as shown here. Examples of uniaxial stretching include uniaxial stretching in the film transport direction between rolls with different peripheral speeds, uniaxial stretching in the film transport direction using a heated roll, and stretching in the width direction using a tenter. The uniaxial stretching may be performed by dry stretching in the air, or by wet stretching in a swollen state using a solvent such as water. The stretching ratio is usually about 3 to 8 times. Alternatively, an aqueous solution containing polyvinyl alcohol may be applied to a thermoplastic resin film, followed by drying, and then stretched together with the thermoplastic resin film by the above-mentioned method.

[0017] The polyvinyl alcohol-based resin film can be dyed with a dichroic dye by, for example, immersing the polyvinyl alcohol-based resin film in an aqueous solution containing the dichroic dye. Specific examples of the dichroic dye include iodine and dichroic organic dyes.

[0018] <Retardation layer> [Layer structure of retardation layer] The retardation layer is a layer including a layer that exhibits retardation. The portion that exhibits retardation may be a retardation film formed by stretching a thermoplastic resin film or the like, or may be an optically anisotropic layer made of a polymer in which a polymerizable liquid crystal compound is oriented. Hereinafter, the optically anisotropic layer made of a polymer in which a polymerizable liquid crystal compound is oriented will be described.

[0019] A composition containing a polymerizable liquid crystal compound (hereinafter also referred to as "optically anisotropic layer-forming composition") is applied onto a transparent substrate to form an optically anisotropic layer consisting of an aligned polymer of the polymerizable liquid crystal compound, which is preferable in terms of enabling a thin film and arbitrary design of wavelength dispersion characteristics. In addition, the retardation layer-forming composition may further contain a solvent, a photopolymerization initiator, a photosensitizer, a polymerization inhibitor, a leveling agent, an adhesion improver, etc.

[0020] The optically anisotropic layer is typically formed by applying a polymerizable liquid crystal composition onto an alignment film formed on a substrate (described later) and polymerizing the polymerizable liquid crystal compound contained in the polymerizable liquid crystal composition. The optically anisotropic layer may also be formed by applying a polymerizable liquid crystal composition directly onto the substrate and polymerizing the polymerizable liquid crystal compound contained in the polymerizable liquid crystal composition. The optically anisotropic layer is typically a film formed by curing the polymerizable liquid crystal compound in an aligned state. To generate a phase difference within the viewing surface, the optically anisotropic layer must be a cured film formed by polymerizing the polymerizable group in a state where the polymerizable liquid crystal compound is aligned horizontally relative to the substrate surface. In this case, if the polymerizable liquid crystal compound is a rod-shaped liquid crystal, the layer will be a positive A plate, and if the polymerizable liquid crystal compound is a discotic liquid crystal, the layer will be a negative A plate.

[0021] To achieve a high level of antireflection of external light, the optically anisotropic layer should have a λ / 4 plate function (i.e., a π / 2 retardation function) across the entire visible light range. From this perspective, a reverse wavelength dispersion λ / 4 layer, which exhibits small changes in retardation across the entire visible light range, is preferred.

[0022] It is also preferable to combine two or more optically anisotropic layers with different orientations, for example, an optically anisotropic layer having a λ / 4 plate function and an optically anisotropic layer having a λ / 2 plate function (i.e., a π retardation function) may be combined.

[0023] Furthermore, from the viewpoint of ensuring anti-reflection performance in oblique directions, it is also preferable to include a layer having anisotropy in the thickness direction (positive C plate). Each optically anisotropic layer may have a tilted alignment or a cholesteric alignment. When a reverse wavelength dispersion λ / 4 layer and a positive C plate are combined, an ultraviolet absorbing layer may be laminated between them.

[0024] [Reverse wavelength dispersion λ / 4 layer] For the λ / 4 function over the entire visible light range, it is preferable that the in-plane retardation R(λ) for light with a wavelength of λ nm satisfies the optical characteristic represented by the following formula (1), and it is more preferable that the optical characteristic represented by all of the following formulas (1), (2), and (3) be satisfied. 100nm <Re(550)<160nm …(1) (In the formula, Re(550) represents the in-plane phase difference value (in-plane retardation) for light with a wavelength of 550 nm.) Re(450) / Re(550)≦1.0 …(2) 1.00≦Re(650) / Re(550) …(3) (In the formula, Re(450) represents the in-plane retardation value for light with a wavelength of 450 nm, Re(550) represents the in-plane retardation value for light with a wavelength of 550 nm, and Re(650) represents the in-plane retardation value for light with a wavelength of 650 nm.)

[0025] If the "Re(450) / Re(550)" of the retardation layer exceeds 1.0, light leakage on the short wavelength side of an elliptical polarizing plate equipped with the optically anisotropic layer increases. The ratio is preferably 0.7 or more and 1.0 or less, more preferably 0.80 or more and 0.95 or less, even more preferably 0.80 or more and 0.92 or less, and particularly preferably 0.82 or more and 0.88 or less. The value of "Re(450) / Re(550)" can be adjusted arbitrarily by adjusting the mixing ratio of the polymerizable liquid crystal compound, the stacking angle of the multiple optically anisotropic layers, and the retardation value.

[0026] The in-plane retardation value of the optically anisotropic layer can be adjusted by the thickness of the optically anisotropic layer. Since the in-plane retardation value is determined by the following formula (4), the desired in-plane retardation value (Re(λ)) can be obtained by adjusting Δn(λ) and the film thickness d. The thickness of the optically anisotropic layer can be measured using an interference film thickness meter, a laser microscope, or a stylus film thickness meter. Note that Δn(λ) depends on the molecular structure of the polymerizable liquid crystal compound described below. Re(λ)=d×Δn(λ) …(4) (In the formula, Re(λ) represents the in-plane retardation value at a wavelength of λ nm, d represents the film thickness, and Δn(λ) represents the birefringence at a wavelength of λ nm.)

[0027] [Optical anisotropic layer-forming composition; polymerizable liquid crystal compound] The polymerizable liquid crystal compound contained in the polymerizable liquid crystal composition used as a raw material for forming the optically anisotropic layer refers to a liquid crystal compound having a polymerizable group, particularly a photopolymerizable group. Conventional polymerizable liquid crystal compounds can be used as the polymerizable liquid crystal compound. The photopolymerizable group refers to a group that can participate in a polymerization reaction by reactive species, such as active radicals or acids, generated from a photopolymerization initiator. Examples of the photopolymerizable group include vinyl, vinyloxy, 1-chlorovinyl, isopropenyl, 4-vinylphenyl, acryloyloxy, methacryloyloxy, oxiranyl, and oxetanyl groups. Among these, acryloyloxy, methacryloyloxy, vinyloxy, oxiranyl, and oxetanyl groups are preferred, with acryloyloxy groups being more preferred. The liquid crystal property may be either thermotropic or lyotropic, but thermotropic liquid crystals are preferred due to their ability to precisely control the film thickness. The thermotropic liquid crystal may have a nematic or smectic phase structure. The polymerizable liquid crystal compound may be either rod-shaped or discotic. The polymerizable liquid crystal compound may be used alone or in combination.

[0028] As the polymerizable liquid crystal compound, from the viewpoint of exhibiting reverse wavelength dispersion, a liquid crystal having a T-shaped or H-shaped mesogen structure which further has birefringence in the direction perpendicular to the molecular long axis direction is preferred, and from the viewpoint of obtaining stronger dispersion, a T-shaped liquid crystal is more preferred. Specific examples of the structure of the T-shaped liquid crystal include those represented by the following formula (I):

[0029] [ka] Examples of the compound include compounds represented by the following formula:

[0030] In formula (I), Ar represents a divalent aromatic group which may have a substituent. The divalent aromatic group preferably contains at least one of a nitrogen atom, an oxygen atom, and a sulfur atom. When the divalent group Ar contains two or more aromatic groups, the two or more aromatic groups may be bonded to each other via a divalent bonding group such as a single bond, -CO-O-, or -O-.

[0031] G 1 and G 2 each independently represents a divalent aromatic group or a divalent alicyclic hydrocarbon group, wherein a hydrogen atom contained in the divalent aromatic group or divalent alicyclic hydrocarbon group may be substituted with a halogen atom, an alkyl group having 1 to 4 carbon atoms, a fluoroalkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a cyano group, or a nitro group, and a carbon atom constituting the divalent aromatic group or divalent alicyclic hydrocarbon group may be substituted with an oxygen atom, a sulfur atom, or a nitrogen atom.

[0032] L 1 , L 2 , B 1 and B 2 are each independently a single bond or a divalent linking group.

[0033] k and l each independently represent an integer of 0 to 3, and satisfy the relationship 1≦k+l. When 2≦k+l, B 1 and B 2 , G 1 and G 2may be the same as or different from each other.

[0034] E 1 and E 2 each independently represents an alkanediyl group having 1 to 17 carbon atoms, wherein a hydrogen atom contained in the alkanediyl group may be substituted with a halogen atom, and wherein a -CH2- contained in the alkanediyl group may be substituted with -O-, -S-, or -COO-, and when there are a plurality of -O-, -S-, or -COO-, they are not adjacent to each other.

[0035] P 1 and P 2 each independently represents a polymerizable group or a hydrogen atom, and at least one of them is a polymerizable group.

[0036] G 1 and G 2 are each independently preferably a 1,4-phenylenediyl group optionally substituted with at least one substituent selected from the group consisting of halogen atoms and alkyl groups having 1 to 4 carbon atoms, or a 1,4-cyclohexanediyl group optionally substituted with at least one substituent selected from the group consisting of halogen atoms and alkyl groups having 1 to 4 carbon atoms, more preferably a 1,4-phenylenediyl group substituted with a methyl group, an unsubstituted 1,4-phenylenediyl group, or an unsubstituted 1,4-trans-cyclohexanediyl group, and particularly preferably an unsubstituted 1,4-phenylenediyl group or an unsubstituted 1,4-trans-cyclohexanediyl group.

[0037] Also, there are multiple G 1 and G 2 At least one of L is preferably a divalent alicyclic hydrocarbon group. 1 or L 2 G binds to 1 and G 2 It is more preferable that at least one of the groups is a divalent alicyclic hydrocarbon group.

[0038] L 1 and L 2are each independently preferably a single bond, an alkylene group having 1 to 4 carbon atoms, -O-, -S-, -R a1 OR a2 -, -R a3 COOR a4 -, -R a5 OCOR a6 -, R a7 OC=OOR a8 -, -N=N-, -CR c =CR d - or -C≡C-, where R a1 ~R a8 each independently represents a single bond or an alkylene group having 1 to 4 carbon atoms; R c and R d represents an alkyl group having 1 to 4 carbon atoms or a hydrogen atom. 1 and L 2 are each independently preferably a single bond, -OR a2-1 -, -CH2-, -CH2CH2-, -COOR a4-1 - or OCOR a6-1 -, where R a2-1 , R a4-1 , R a6-1 Each independently represents a single bond, -CH2-, or -CH2CH2-. 1 and L 2 are each independently more preferably a single bond, -O-, -CH2CH2-, -COO-, -COOCH2CH2-, or OCO-.

[0039] B 1 and B 2 are each independently preferably a single bond, an alkylene group having 1 to 4 carbon atoms, -O-, -S-, -R a9 OR a10 -, -R a11 COOR a12 -, -R a13 OCOR a14 - or R a15 OC=OOR a16 -, where R a9 ~R a16 each independently represents a single bond or an alkylene group having 1 to 4 carbon atoms. B1 and B2 each independently preferably represent a single bond, -OR a10-1-, -CH2-, -CH2CH2-, -COOR a12-1 - or OCOR a14-1 -, where R a10-1 , R a12-1 , R a14-1 Each independently represents a single bond, -CH2-, or -CH2CH2-. B 1 and B 2 are each independently more preferably a single bond, -O-, -CH2CH2-, -COO-, -COOCH2CH2-, -OCO-, or OCOCH2CH2-.

[0040] From the viewpoint of exhibiting reverse wavelength dispersion, k and l are preferably in the range of 2≦k+l≦6, preferably k+l=4, and more preferably k=2 and l=2. When k=2 and l=2, a symmetric structure is obtained, which is preferable.

[0041] E 1 and E 2 are each independently preferably an alkanediyl group having 1 to 17 carbon atoms, more preferably an alkanediyl group having 4 to 12 carbon atoms.

[0042] P 1 or P 2 Examples of the polymerizable group represented by the formula (I) include an epoxy group, a vinyl group, a vinyloxy group, a 1-chlorovinyl group, an isopropenyl group, a 4-vinylphenyl group, an acryloyloxy group, a methacryloyloxy group, an oxiranyl group, and an oxetanyl group. Among these, an acryloyloxy group, a methacryloyloxy group, a vinyloxy group, an oxiranyl group, and an oxetanyl group are preferred, and an acryloyloxy group is more preferred.

[0043] Ar preferably has at least one selected from an aromatic hydrocarbon ring which may have a substituent, an aromatic heterocyclic ring which may have a substituent, and an electron-withdrawing group. Examples of the aromatic hydrocarbon ring include a benzene ring, a naphthalene ring, and an anthracene ring, with a benzene ring and a naphthalene ring being preferred. Examples of the aromatic heterocyclic ring include a furan ring, a benzofuran ring, a pyrrole ring, an indole ring, a thiophene ring, a benzothiophene ring, a pyridine ring, a pyrazine ring, a pyrimidine ring, a triazole ring, a triazine ring, a pyrroline ring, an imidazole ring, a pyrazole ring, a thiazole ring, a benzothiazole ring, a thienothiazole ring, an oxazole ring, a benzoxazole ring, and a phenanthroline ring. Among these, a thiazole ring, a benzothiazole ring, or a benzofuran ring is preferred, and a benzothiazole group is even more preferred. Furthermore, when Ar contains a nitrogen atom, it is preferred that the nitrogen atom has π electrons.

[0044] In formula (I), the total number Nπ of π electrons contained in the divalent aromatic group represented by Ar is preferably 8 or more, more preferably 10 or more, even more preferably 14 or more, and particularly preferably 16 or more. It is also preferably 30 or less, more preferably 26 or less, and even more preferably 24 or less.

[0045] Suitable examples of the aromatic group represented by Ar include the following groups:

[0046] [ka]

[0047] In formulas (Ar-1) to (Ar-23), * represents a linking portion, and Z 0 , Z 1 and Z 2each independently represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 12 carbon atoms, a cyano group, a nitro group, an alkylsulfinyl group having 1 to 12 carbon atoms, an alkylsulfonyl group having 1 to 12 carbon atoms, a carboxyl group, a fluoroalkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an alkylthio group having 1 to 12 carbon atoms, an N-alkylamino group having 1 to 12 carbon atoms, an N,N-dialkylamino group having 2 to 12 carbon atoms, an N-alkylsulfamoyl group having 1 to 12 carbon atoms, or an N,N-dialkylsulfamoyl group having 2 to 12 carbon atoms.

[0048] Q 1 and Q 2 are each independently -CR 2’ R 3’ -, -S-, -NH-, -NR 2’ represents -, -CO- or O-; R 2’ and R 3’ each independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.

[0049] J 1 , and J 2 each independently represents a carbon atom or a nitrogen atom.

[0050] Y 1 and Y 2 each independently represents an optionally substituted aromatic hydrocarbon group or an optionally substituted aromatic heterocyclic group.

[0051] W 1 and W 2 each independently represents a hydrogen atom, a cyano group, a methyl group or a halogen atom; and m represents an integer of 0 to 6.

[0052] Y 1 and Y 2Examples of the aromatic hydrocarbon group in the formula (I) include aromatic hydrocarbon groups having 6 to 20 carbon atoms, such as a phenyl group, a naphthyl group, an anthryl group, a phenanthryl group, and a biphenyl group, with a phenyl group and a naphthyl group being preferred, and a phenyl group being more preferred. Examples of the aromatic heterocyclic group include aromatic heterocyclic groups having 4 to 20 carbon atoms and containing at least one heteroatom, such as a nitrogen atom, an oxygen atom, or a sulfur atom, such as a furyl group, a pyrrolyl group, a thienyl group, a pyridinyl group, a thiazolyl group, and a benzothiazolyl group being preferred.

[0053] Y 1 and Y 2 may each independently be an optionally substituted polycyclic aromatic hydrocarbon group or polycyclic aromatic heterocyclic group. The polycyclic aromatic hydrocarbon group refers to a fused polycyclic aromatic hydrocarbon group or a group derived from an aromatic ring assembly. The polycyclic aromatic heterocyclic group refers to a fused polycyclic aromatic heterocyclic group or a group derived from an aromatic ring assembly.

[0054] Z 0 , Z 1 and Z 2 are each independently preferably a hydrogen atom, a halogen atom, an alkyl group having 1 to 12 carbon atoms, a cyano group, a nitro group, or an alkoxy group having 1 to 12 carbon atoms; Z 0 is more preferably a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, or a cyano group, and Z 1 and Z 2 is more preferably a hydrogen atom, a fluorine atom, a chlorine atom, a methyl group, or a cyano group.

[0055] Q 1 and Q 2 -NH-, -S-, -NR 2’ -, -O- are preferred, and R 2’ is preferably a hydrogen atom, and among these, -S-, -O-, and -NH- are particularly preferred.

[0056] Among the formulae (Ar-1) to (Ar-23), the formulae (Ar-6) and (Ar-7) are preferred from the viewpoint of molecular stability.

[0057] In formulas (Ar-16) to (Ar-23), Y 1 is the nitrogen atom to which it is bonded and Z 0 and Y may form an aromatic heterocyclic group together. Examples of the aromatic heterocyclic group include those mentioned above as aromatic heterocycles that Ar may have, such as a pyrrole ring, an imidazole ring, a pyrroline ring, a pyridine ring, a pyrazine ring, a pyrimidine ring, an indole ring, a quinoline ring, an isoquinoline ring, a purine ring, and a pyrrolidine ring. This aromatic heterocyclic group may have a substituent. In addition, Y 1 is the nitrogen atom to which it is bonded and Z 0 and may be the above-mentioned optionally substituted polycyclic aromatic hydrocarbon group or polycyclic aromatic heterocyclic group, such as a benzofuran ring, a benzothiazole ring, or a benzoxazole ring.

[0058] Among polymerizable liquid crystal compounds, compounds with a maximum absorption wavelength of 300 to 400 nm are preferred. When a polymerizable liquid crystal composition contains a photopolymerization initiator, the polymerization reaction and gelation of the polymerizable liquid crystal compound may progress during long-term storage. However, if the polymerizable liquid crystal compound has a maximum absorption wavelength of 300 to 400 nm, even if the composition is exposed to ultraviolet light during storage, the generation of reactive species from the photopolymerization initiator and the progression of the polymerization reaction and gelation of the polymerizable liquid crystal compound due to the reactive species can be effectively suppressed. This is advantageous in terms of long-term stability of the polymerizable liquid crystal composition and can improve the alignment and film thickness uniformity of the resulting cured liquid crystal film. The maximum absorption wavelength of the polymerizable liquid crystal compound can be measured using a UV-visible spectrophotometer in a solvent. The solvent can be a solvent capable of dissolving the polymerizable liquid crystal compound, such as chloroform.

[0059] The content of the polymerizable liquid crystal compound in the polymerizable liquid crystal composition is, for example, 70 to 99.5 parts by mass, preferably 80 to 99 parts by mass, more preferably 85 to 98 parts by mass, and even more preferably 90 to 95 parts by mass, relative to 100 parts by mass of the solid content of the polymerizable liquid crystal composition. A content of the polymerizable liquid crystal compound within the above range is advantageous from the viewpoint of the alignment of the resulting cured liquid crystal film. In this specification, the solid content of the polymerizable liquid crystal composition refers to all components of the polymerizable liquid crystal composition excluding volatile components such as organic solvents.

[0060] [Combination of a λ / 2 layer with positive wavelength dispersion and a λ / 4 layer with positive wavelength dispersion] One known method for achieving anti-reflection performance is to combine a layer with a λ / 2 layer having positive wavelength dispersion and a λ / 4 layer having positive wavelength dispersion, for example, by combining a layer having the optical properties represented by the following formulas (5), (7), and (8) with a layer having the optical properties represented by the following formulas (6), (7), and (8) in a specific slow axis relationship. 100nm <Re(550)<160nm …(5) 200nm <Re(550)<320nm …(6) Re(450) / Re(550)≧1.00 …(7) 1.00≧Re(650) / Re(550) …(8)

[0061] Methods for combining the above configurations include well-known methods such as those described in JP 2015-163935 A and WO 2013 / 137464 A. From the viewpoint of viewing angle compensation, it is preferable to use a λ / 2 layer containing a polymer of a discotic polymerizable liquid crystal compound and a λ / 4 layer containing a polymer of a rod-shaped polymerizable liquid crystal compound.

[0062] Examples of the discotic polymerizable liquid crystal compound include a compound containing a group represented by formula (W) (hereinafter, sometimes referred to as polymerizable liquid crystal compound (C)).

[0063] [ka] [In formula (W), R 40 represents the following formulas (W-1) to (W-5).

[0064] [ka]

[0065] X 40 and Z 40 represents an alkanediyl group having 1 to 12 carbon atoms, and a hydrogen atom contained in the alkanediyl group may be substituted with an alkoxy group having 1 to 5 carbon atoms, and a hydrogen atom contained in the alkoxy group may be substituted with a halogen atom. Furthermore, -CH2- constituting the alkanediyl group may be replaced with -O- or -CO-. Furthermore, m2 is an integer of 1 to 20.

[0066] Examples of the rod-shaped polymerizable liquid crystal compound include compounds represented by the following formula (I), formula (II), formula (III), formula (IV), formula (V) or formula (VI). P11-B11-E11-B12-A11-B13-A12-B14-A13-B15-A14-B16-E12-B17-P12 …(I) P11-B11-E11-B12-A11-B13-A12-B14-A13-B15-A14-F11…(II) P11-B11-E11-B12-A11-B13-A12-B14-A13-B15-E12-B17-P12…(III) P11-B11-E11-B12-A11-B13-A12-B14-A13-F11…(IV) P11-B11-E11-B12-A11-B13-A12-B14-E12-B17-P12 …(V) P11-B11-E11-B12-A11-B13-A12-F11…(VI)

[0067] In the above formulas (I) to (VI), A11 represents a divalent alicyclic hydrocarbon group or a divalent aromatic hydrocarbon group. The hydrogen atoms contained in the divalent alicyclic hydrocarbon group and the divalent aromatic hydrocarbon group may be substituted with a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, a cyano group, or a nitro group, and the hydrogen atoms contained in the alkyl group having 1 to 6 carbon atoms and the alkoxy group having 1 to 6 carbon atoms may be substituted with a fluorine atom.

[0068] B11 is -O-, -S-, -CO-O-, -O-CO-, -O-CO-O-, -CO-NR 16 -, -NR 16 R represents -CO-, -CO-, -CS- or a single bond. 16 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.

[0069] B12 and B13 each independently represent -C≡C-, -CH=CH-, -CH2-CH2-, -O-, -S-, -C(=O)-, -C(=O)-O-, -OC(=O)-, -OC(=O)-O-, -CH=N-, -N=CH-, -N=N-, or -C(=O)-NR 16 -, -NR 16 represents -C(=O)-, -OCH2-, -OCF2-, -CHO-, -CF2O-, -CH=CH-C(=O)-O-, -OC(=O)-CH=CH- or a single bond.

[0070] E11 represents an alkanediyl group having 1 to 12 carbon atoms, wherein a hydrogen atom contained in the alkanediyl group may be substituted with an alkoxy group having 1 to 5 carbon atoms, and a hydrogen atom contained in the alkoxy group may be substituted with a halogen atom. Furthermore, -CH2- constituting the alkanediyl group may be substituted with -O- or -CO-.

[0071] The number of carbon atoms in the aromatic hydrocarbon group and alicyclic hydrocarbon group of A11 is preferably in the range of 3 to 18, more preferably in the range of 5 to 12, and particularly preferably 5 or 6. A11 is preferably a cyclohexane-1,4-diyl group or a 1,4-phenylene group.

[0072] E11 is preferably a linear alkanediyl group having 1 to 12 carbon atoms. -CH2- constituting the alkanediyl group may be replaced with -O-.

[0073] Specific examples include linear alkanediyl groups having 1 to 12 carbon atoms, such as methylene, ethylene, propane-1,3-diyl, butane-1,4-diyl, pentane-1,5-diyl, hexane-1,6-diyl, heptane-1,7-diyl, octane-1,8-diyl, nonane-1,9-diyl, decane-1,10-diyl, undecane-1,11-diyl, and dodecane-1,12-diyl; -CH-CH-O-CH-CH-, -CH-CH-O-CH-CH-O-CH-CH-, and -CH-CH-O-CH-CH-O-CH-CH-O-CH-CH-.

[0074] As B11, -O-, -S-, -CO-O-, and -O-CO- are preferred, and among these, -CO-O- is more preferred.

[0075] B12 and B13 are each independently preferably -O-, -S-, -C(=O)-, -C(=O)-O-, -OC(=O)- or -OC(=O)-O-, and among these, -O- or -OC(=O)-O- is more preferred.

[0076] The polymerizable group represented by P11 is preferably a radically polymerizable group or a cationically polymerizable group in terms of high polymerization reactivity, particularly high photopolymerization reactivity. In addition, the polymerizable group is preferably a group represented by the following formulas (P-11) to (P-15), because they are easy to handle and the liquid crystal compound itself is easy to produce.

[0077] [ka] [In formulas (P-11) to (P-15), R 17 ~R 21 each independently represents an alkyl group having 1 to 6 carbon atoms or a hydrogen atom.

[0078] Specific examples of the groups represented by formulae (P-11) to (P-15) include groups represented by the following formulae (P-16) to (P-20).

[0079] [ka]

[0080] P11 is preferably a group represented by any one of formulas (P-14) to (P-20), more preferably a vinyl group, a p-stilbene group, an epoxy group, or an oxetanyl group. The group represented by P11-B11- is further preferably an acryloyloxy group or a methacryloyloxy group.

[0081] A12 to A14 each independently have the same meaning as A11, B14 to B16 each independently have the same meaning as B12, B17 has the same meaning as B11, and E12 has the same meaning as E11. F11 represents a hydrogen atom, an alkyl group having 1 to 13 carbon atoms, an alkoxy group having 1 to 13 carbon atoms, a cyano group, a nitro group, a trifluoromethyl group, a dimethylamino group, a hydroxy group, a methylol group, a formyl group, a sulfo group (-SO3H), a carboxy group, an alkoxycarbonyl group having 1 to 10 carbon atoms, or a halogen atom, and -CH2- constituting the alkyl group and alkoxy group may be replaced with -O-.

[0082] [Other configurations] In addition to the configuration combining the above-mentioned positive wavelength dispersion λ / 2 layer and positive wavelength dispersion λ / 4 layer, configurations with tilt alignment or cholesteric alignment are also available without any particular restrictions as long as they achieve anti-reflection function, and examples include well-known configurations such as those described in WO2021 / 060378, WO2021 / 132616, and WO2021 / 132624.

[0083] <Positive C Plate> There are no particular limitations on the positive C plate as long as it has anisotropy in the thickness direction, but if it does not have tilt alignment or cholesteric alignment, it has the optical characteristics expressed by formula (9). nx≒ny <nz …(9)

[0084] The in-plane retardation value Re(550) of the positive C plate at a wavelength of 550 nm is usually in the range of 0 to 10 nm, preferably 0 to 5 nm. Furthermore, the retardation value Rth(550) in the thickness direction at a wavelength of 550 nm is usually in the range of −170 nm to −10 nm, preferably −150 nm to −20 nm, and more preferably −100 nm to −40 nm. If the retardation value in the thickness direction is in this range, the anti-reflection properties from oblique directions can be further improved.

[0085] The positive C plate is preferably a coating layer formed by polymerizing one or more polymerizable liquid crystal compounds, more preferably rod-shaped polymerizable liquid crystal compounds.

[0086] As the rod-shaped polymerizable liquid crystal, compounds represented by the above formulas (I) to (VI) can be used.

[0087] The thickness of each optically anisotropic layer affects the internal haze, which will be described later. From this viewpoint, the thickness of each optically anisotropic layer is preferably 1 μm to 5 μm, and more preferably 2.5 μm to 3.0 μm. In the case of a stretched film, the thickness is usually 300 μm or less, preferably 5 μm to 100 μm, and more preferably 10 μm to 50 μm. In the case of a coating layer, the thickness is preferably 0.5 μm to 5 μm, more preferably 1 μm to 3 μm, and even more preferably 2.5 μm to 3.0 μm.

[0088] When the optically anisotropic layer is a coating layer, the total thickness of the retardation layer is preferably 0.5 μm to 15 μm, and more preferably 1 μm to 10 μm.

[0089] [Method for forming retardation layer] The method for forming the retardation layer is, from the viewpoint of enabling a thin film and arbitrary design of wavelength dispersion characteristics, to form an alignment film on a substrate, apply a retardation layer-forming composition containing a polymerizable liquid crystal compound on the alignment film, and polymerize the polymerizable liquid crystal compound. The retardation layer may be formed by applying a retardation layer-forming composition containing a polymerizable liquid crystal compound directly onto the substrate without forming an alignment film, and polymerizing the polymerizable liquid crystal compound. The retardation layer-forming composition may contain a solvent, a photopolymerization initiator, a photosensitizer, a polymerization inhibitor, a leveling agent, an adhesion improver, and the like.

[0090] (Composition for forming retardation layer; polymerizable liquid crystal compound) The polymerizable liquid crystal compound contained in the retardation layer-forming composition means a liquid crystal compound having a polymerizable group, particularly a photopolymerizable group, and as the polymerizable liquid crystal compound, a conventionally known polymerizable liquid crystal compound can be used. The photopolymerizable group means a group that can be involved in a polymerization reaction by a reactive species generated from a photopolymerization initiator, such as an active radical or an acid.

[0091] The content of the polymerizable liquid crystal compound in the composition for forming a retardation layer is, for example, 70 to 99.5 parts by mass, preferably 80 to 99 parts by mass, more preferably 85 to 98 parts by mass, and even more preferably 90 to 95 parts by mass, relative to 100 parts by mass of the solid content of the polymerizable liquid crystal composition. If the content of the polymerizable liquid crystal compound is within the above range, it is advantageous from the viewpoint of the alignment of the obtained liquid crystal cured film. In this specification, the solid content of the polymerizable liquid crystal composition means all components of the polymerizable liquid crystal composition excluding volatile components such as organic solvents.

[0092] (base material) The substrate is a support on which a retardation layer is formed. The substrate may then be attached to the polarizing film 4 to serve as a protective film 5 for protecting the polarizing film 4.

[0093] Examples of the substrate include film substrates. Long roll-shaped films are more preferred in terms of continuous production. Examples of resins constituting the film substrate include plastics such as polyolefins such as polyethylene, polypropylene, and norbornene-based polymers; cyclic olefin-based resins; polyvinyl alcohol; polyethylene terephthalate; polymethacrylic acid esters; polyacrylic acid esters; cellulose esters such as triacetyl cellulose, diacetyl cellulose, and cellulose acetate propionate; polyethylene naphthalate; polycarbonate; polysulfone; polyether sulfone; polyether ketone; polyphenylene sulfide, and polyphenylene oxide. Among these, film substrates selected from triacetyl cellulose, cyclic olefin-based resins, polymethacrylic acid esters, and polyethylene terephthalate are more preferred in terms of transparency and the like when used in optical film applications.

[0094] The thickness of the substrate is preferably thin enough to allow practical handling, but if it is too thin, the strength decreases and processability tends to be poor. The thickness of the substrate is usually 5 μm to 200 μm, preferably 10 μm to 100 μm, and more preferably 15 to 50 μm. Furthermore, by peeling off the substrate and transferring the polarizing film or optically anisotropic layer, a further thinning effect can be obtained.

[0095] (Alignment film) The alignment film is a film formed on a substrate, and has an alignment regulating force that aligns the polymerizable liquid crystal compound applied onto the alignment film in a desired direction.

[0096] Alignment films facilitate the alignment of polymerizable liquid crystal compounds. Liquid crystal alignment states, such as horizontal alignment, vertical alignment, hybrid alignment, and tilted alignment, vary depending on the properties of the alignment film and the polymerizable liquid crystal compound, and these combinations can be selected arbitrarily. For example, if the alignment film is made of a material that exerts a horizontal alignment as an alignment control force, the polymerizable liquid crystal compound can form horizontal or hybrid alignment. If the alignment film is made of a material that exerts a vertical alignment, the polymerizable liquid crystal compound can form vertical or tilted alignment. The terms horizontal, vertical, and so on refer to the direction of the optical axis of the aligned polymerizable liquid crystal compound relative to the plane of the optically anisotropic layer. For example, vertical alignment means that the optical axis of the aligned polymerizable liquid crystal compound is perpendicular to the plane of the optically anisotropic layer. Here, vertical means 90°±20° relative to the plane of the optically anisotropic layer.

[0097] When the alignment film is made of an alignment polymer, the alignment restraining force can be adjusted arbitrarily by the surface condition or rubbing conditions, and when it is made of a photoalignment polymer, the alignment restraining force can be adjusted arbitrarily by the polarized light irradiation conditions, etc. Furthermore, the liquid crystal alignment can also be controlled by selecting the physical properties of the polymerizable liquid crystal compound, such as the surface tension or liquid crystallinity.

[0098] The alignment film formed between the substrate and the optically anisotropic layer is preferably insoluble in the solvent used to form the optically anisotropic layer on the alignment film, and is heat-resistant to the heat treatment for removing the solvent and orienting the liquid crystal. Examples of the alignment film include alignment films made of orientable polymers, photo-alignment films, groove-alignment films, and stretched films stretched in the alignment direction. When applied to a long roll film, photo-alignment films are preferred because the alignment direction can be easily controlled.

[0099] The thickness of the alignment film is usually in the range of 10 nm to 5000 nm, preferably in the range of 10 nm to 1000 nm, and more preferably in the range of 30 to 300 nm.

[0100] Examples of alignment polymers used in rubbed alignment films include polyamides and gelatins having an amide bond in the molecule, polyimides having an imide bond in the molecule, and their hydrolyzed products such as polyamic acid, polyvinyl alcohol, alkyl-modified polyvinyl alcohol, polyacrylamide, polyoxazole, polyethyleneimine, polystyrene, polyvinylpyrrolidone, polyacrylic acid, and polyacrylic acid esters. Among these, polyvinyl alcohol is preferred. These alignment polymers may be used alone or in combination of two or more.

[0101] Rubbing methods include a method in which an oriented polymer film formed on the surface of a substrate by applying an oriented polymer composition to the substrate and annealing the composition is brought into contact with a rotating rubbing roll wrapped with a rubbing cloth.

[0102] The photo-alignment film is made of a polymer, oligomer, or monomer having a photoreactive group. The photo-alignment film can obtain an alignment control force by irradiating it with polarized light. The photo-alignment film is preferable because the direction of the alignment control force can be freely controlled by selecting the polarization direction of the irradiated polarized light.

[0103] A photoreactive group is a group that exhibits liquid crystal alignment ability upon irradiation with light. Specifically, it induces molecular alignment or a photoreaction that is the origin of liquid crystal alignment ability, such as an isomerization reaction, a dimerization reaction, a photocrosslinking reaction, or a photodecomposition reaction, upon irradiation with light. Among such photoreactive groups, those that undergo a dimerization reaction or a photocrosslinking reaction are preferred because of their excellent alignment ability. As photoreactive groups capable of causing such reactions, those having an unsaturated bond, particularly a double bond, are preferred, and groups having at least one bond selected from the group consisting of a carbon-carbon double bond (C=C bond), a carbon-nitrogen double bond (C=N bond), a nitrogen-nitrogen double bond (N=N bond), and a carbon-oxygen double bond (C=O bond) are more preferred.

[0104] Examples of photoreactive groups having a C=C bond include vinyl groups, polyene groups, stilbene groups, stilbazole groups, stilbazolium groups, chalcone groups, and cinnamoyl groups. Chalcone and cinnamoyl groups are preferred because of their ease of reactivity control and the ability to exert alignment control forces during photoalignment. Examples of photoreactive groups having a C=N bond include groups having structures such as aromatic Schiff bases and aromatic hydrazones. Examples of photoreactive groups having an N=N bond include azobenzene groups, azonaphthalene groups, aromatic heterocyclic azo groups, bisazo groups, and formazan groups, as well as groups with an azoxybenzene basic structure. Examples of photoreactive groups having a C=O bond include benzophenone groups, coumarin groups, anthraquinone groups, and maleimide groups. These groups may have substituents such as alkyl groups, alkoxy groups, aryl groups, allyloxy groups, cyano groups, alkoxycarbonyl groups, hydroxyl groups, sulfonic acid groups, and halogenated alkyl groups.

[0105] Polarized light can be irradiated either directly from the film surface or from the substrate side and then transmitted through the film. It is particularly preferred that the polarized light be substantially parallel. The wavelength of the polarized light irradiated should be within a wavelength range in which the photoreactive group in the polymer or monomer having a photoreactive group can absorb light energy. Specifically, UV (ultraviolet light) with a wavelength of 250 to 400 nm is particularly preferred. Examples of light sources used for polarized light irradiation include xenon lamps, high-pressure mercury lamps, ultra-high-pressure mercury lamps, metal halide lamps, and ultraviolet lasers such as KrF and ArF. High-pressure mercury lamps, ultra-high-pressure mercury lamps, and metal halide lamps are more preferred. These lamps are preferred because of their high emission intensity of ultraviolet light with a wavelength of 313 nm. Polarized light can be irradiated by passing light from the light source through an appropriate polarizer. Examples of such polarizers include polarizing filters, polarizing prisms such as Glan-Thompson and Glan-Taylor, and wire-grid polarizers.

[0106] <Protective film> The protective film 5 is a layer that protects the surface of the polarizing film 4. The polarizing film 4 and the protective film 5 may be laminated directly to each other. Here, "directly laminated" includes a mode in which the protective film is laminated to the polarizing element by its self-adhesive property, and a mode in which the protective film is laminated via an adhesive layer or pressure-sensitive adhesive layer. The protective film may be subjected to a surface treatment (e.g., corona treatment) to improve adhesion to the polarizing element, or may have a thin layer such as a primer layer (also called an easy-adhesion layer) formed thereon. The protective film 5 is laminated to one or both sides of the polarizing film 4.

[0107] The protective film 5 can be, for example, a resin film with excellent transparency, mechanical strength, thermal stability, moisture barrier properties, isotropy, stretchability, etc. The resin film may also be a thermoplastic resin film. Specific examples of such resins include cellulose-based resins such as triacetyl cellulose; polyester-based resins such as polyethylene terephthalate and polyethylene naphthalate; polyethersulfone-based resins; polysulfone-based resins; polycarbonate-based resins; polyamide-based resins such as nylon and aromatic polyamide; polyimide-based resins; polyolefin-based resins such as polyethylene, polypropylene, and ethylene-propylene copolymers; cyclic polyolefin-based resins having cyclo- and norbornene structures (also known as norbornene-based resins); (meth)acrylic resins such as polymethyl methacrylate; polyarylate-based resins; polystyrene-based resins; polyvinyl alcohol-based resins, and mixtures thereof. Protective films made of such materials are readily available commercially. Other examples include thermosetting or ultraviolet-curing resins such as (meth)acrylic, urethane, (meth)acrylic urethane, epoxy, and silicone-based resins. In this specification, (meth)acrylic means either acrylic or methacrylic.

[0108] The thickness of the protective film 5 is preferably 5 μm to 60 μm, more preferably 10 μm to 50 μm, even more preferably 15 μm to 40 μm, and particularly preferably 20 μm to 30 μm.

[0109] The haze measured by combining the protective film 5, the retardation layer 6, and all components between the protective film 5 and the retardation layer 6 (hereinafter referred to as internal haze) is 0.3% or more. This internal haze is preferably 1.3% or less, more preferably 0.4% to 1.1%, even more preferably 0.5% to 1.0%, and even more preferably 0.6% to 0.9%. The upper limit is preferably 0.8%. If this internal haze is small, the antiglare properties are poor, and if this internal haze is high, the clarity of the organic EL display device is poor. The internal haze is measured by the method described in the Examples section.

[0110] The protective film 5 preferably has an absorptance of 80% to 99%, and more preferably 90% to 95%, for light having a wavelength of 380 nm.

[0111] <Anti-glare layer> The antiglare layer 2 is a layer for suppressing surface reflection of the optical laminate 1A. Constituent materials are preferably those that are cured by heat or light. Examples include organic materials such as organosilicones, melamines, epoxies, (meth)acrylics, and urethane (meth)acrylates, and inorganic materials such as silicon dioxide. Among these, urethane (meth)acrylate or polyfunctional (meth)acrylate hard coat materials are preferably used because they have good adhesion to the antiglare layer-forming substrate layer 3 and are excellent in productivity. Pentaerythritol tetraacrylate is also preferred. Note that (meth)acrylate means that either acrylate or methacrylate may be used.

[0112] The antiglare layer 2 may contain various fillers, not only for the purpose of improving antiglare properties, but also, if desired, for the purposes of adjusting the refractive index, improving the flexural modulus, stabilizing the volume shrinkage rate, and further improving heat resistance and antistatic properties. It may also contain additives such as antioxidants, UV absorbers, light stabilizers, antistatic agents, leveling agents, and antifoaming agents. By adjusting these, the antiglare layer can be endowed with UV absorption functionality (preventing polarizer degradation), improved antiglare properties, and hard coat functionality (ensuring sufficient scratch resistance). Achieving these effects with a single antiglare layer contributes to thinner films, etc.

[0113] The antiglare properties of the antiglare layer 2 are exhibited by having a finely textured surface or by containing organic or inorganic fine particles or the above-mentioned additives. An antiglare layer "having a finely textured surface" can be formed by 1) forming a coating film containing fine particles on a substrate layer for forming an antiglare layer and creating a texture based on the fine particles, or 2) forming a coating film, with or without fine particles, on a substrate layer for forming an antiglare layer, and then pressing the coating film against a mold (e.g., a roll) with a textured surface to transfer the texture (also known as an embossing method). Alternatively, an antiglare layer "containing organic or inorganic fine particles or the above-mentioned additives" can be formed by preparing a composition for forming an antiglare layer, applying the composition to a substrate layer for forming an antiglare layer, and then drying the composition.

[0114] The thickness of the antiglare layer may be 1 μm to 20 μm, or may be 2 μm to 10 μm.

[0115] <Base material layer for forming anti-glare layer> The antiglare layer-forming substrate layer 3 is a substrate for forming the antiglare layer 2. At the same time, the antiglare layer-forming substrate layer 3 also functions as a protective film for protecting the polarizing film 4.

[0116] The constituent material of the antiglare layer-forming substrate layer 3 may be the same as that of the above-mentioned "protective film 5." The constituent thickness of the antiglare layer-forming substrate layer 3 may be 10 μm to 60 μm, or may be 15 μm to 30 μm.

[0117] The distance between the surface of the antiglare layer-forming substrate layer 3 facing the polarizing film 4 and the surface of the retardation layer 6 opposite the polarizing film 4 is preferably 70 μm or less, and more preferably 60 μm or less. This shortens the optical path that light emitted from the organic EL element takes to reach the antiglare layer, thereby reducing the range of light diffusion. This makes it easier to maintain the clarity of the displayed image. In order to shorten this distance, it is preferable that the antiglare layer-forming substrate layer 3 and the polarizing film 4 are directly bonded to each other.

[0118] In this embodiment, the haze (external haze) measured by combining the antiglare layer 2 and the antiglare layer-forming substrate layer 3 is less than 5%. From the viewpoint of suppressing glare while maintaining good antiglare properties, this haze is preferably 0.1% to 4.0%, more preferably 0.3% to 3.0%, even more preferably 0.5% to 1.5%, and particularly preferably less than 1.0%. The haze (external haze) may be 0.5% to 2.0%. The haze is measured by the method described in the Examples section.

[0119] In this embodiment, the transmittance of light having a wavelength of 380 nm measured through the antiglare layer 2 and the antiglare layer-forming substrate layer 3 together is preferably 1% to 20%, more preferably 10% or less, and particularly preferably 5% or less. Within this range, the effect of preventing deterioration of polarizing films and the like is high.

[0120] In this specification, the antiglare layer 2 and the antiglare layer-forming substrate layer 3 may be collectively referred to as an "antiglare film."

[0121] <Adhesive layer> The pressure-sensitive adhesive composition forming the first pressure-sensitive adhesive layer 7a and the second pressure-sensitive adhesive layer 7b can be any conventional pressure-sensitive adhesive composition having excellent optical transparency, and can be, for example, a pressure-sensitive adhesive composition having a base polymer such as an acrylic resin, a urethane resin, a silicone resin, or a polyvinyl ether resin. It may also be an active energy ray-curable pressure-sensitive adhesive composition or a heat-curable pressure-sensitive adhesive composition. Among these, a pressure-sensitive adhesive composition having an acrylic resin as a base polymer, which is excellent in transparency, adhesive strength, removability, weather resistance, heat resistance, etc., is preferred.

[0122] The thickness of the pressure-sensitive adhesive layer is usually 0.1 to 30 μm, preferably 3 to 30 μm, and more preferably 5 to 25 μm.

[0123] <Lamination> A circularly polarizing plate can be obtained by laminating an antiglare film, a polarizing film, and a retardation layer. These laminations can be performed simultaneously using an adhesive or pressure-sensitive adhesive layer, or sequentially using two sheets at a time. When the antiglare film, polarizing film, and retardation layer are all long, they can be laminated using nip rolls while being transported.

[0124] When laminating a polarizing film and a retardation layer, the polarizing film or the retardation layer may be provided with a protective film in advance. When the polarizing film is provided with a protective film in advance to form a polarizing plate, the polarizing film and the protective film are bonded together with an adhesive, and the retardation layer is bonded to the protective film side via an adhesive or a pressure-sensitive adhesive layer (see FIG. 1). When the retardation layer is provided with a protective film in advance, the polarizing film is bonded to the protective film side via an adhesive (see optical laminate 1B in FIG. 2). In this case, the pressure-sensitive adhesive layer 7a is not necessary, and the substrate that serves as the support for the optically anisotropic layer has the function of a protective film for the polarizer, thereby reducing the number of manufacturing steps.

[0125] The adhesive layer may be made of any suitable adhesive, such as a water-based adhesive or an active energy ray-curable adhesive.

[0126] The thickness of the adhesive when applied can be set to any appropriate value. For example, it is set so that an adhesive layer having a desired thickness is obtained after curing or heating (drying). The thickness of the adhesive layer is preferably 0.01 μm or more and 7 μm or less, more preferably 0.01 μm or more and 5 μm or less, even more preferably 0.01 μm or more and 2 μm or less, and most preferably 0.01 μm or more and 1 μm or less.

[0127] Examples of the water-based adhesive include an aqueous solution of polyvinyl alcohol-based resin, and a water-based two-component urethane-based emulsion adhesive.

[0128] The active energy ray-curable adhesive is an adhesive containing a curable compound that is cured by irradiation with active energy rays such as ultraviolet light, visible light, electron beams, and X-rays, and is preferably an ultraviolet ray-curable adhesive.

[0129] <Effects> In conventional circularly polarizing plates, the haze increases when antiglare properties are imparted, resulting in a strong sense of glare in color displays. In contrast, in the optical laminate of the present embodiment, the haze measured by combining the antiglare layer and the antiglare layer-forming substrate layer is a moderately suppressed value of less than 5%, so that when an organic EL display device is constructed, glare can be suppressed while maintaining antiglare properties.

[0130] <Organic electroluminescence display device> The optical laminate 1A can be applied to image display devices, particularly organic electroluminescence (organic EL) display devices, such as mobile devices such as smartphones and tablets, televisions, digital photo frames, electronic signs, measuring instruments or meters, office equipment, medical equipment, and computing equipment. As shown in Fig. 3, an organic EL display device 10 can be configured by bonding the optical laminate 1A to the viewing side of an organic EL display panel 9.

[0131] Although preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, in the above embodiments, an example was shown in which the antiglare layer-forming substrate layer 3 and the polarizing film 4 are directly bonded to each other, but another layer (intervening layer 8) may be interposed between the antiglare layer-forming substrate layer and the polarizing film. The intervening layer 8 may be an ultraviolet absorbing layer 8, as in the optical laminate 1C shown in FIG. 4, for example. In this case, a third pressure-sensitive adhesive layer 7c is used to bond the antiglare layer-forming substrate layer 3 and the ultraviolet absorbing layer 8.

[0132] Furthermore, a coating layer (surface treatment layer) other than the antiglare layer may be provided on the surface of the optical laminate. Specific examples of the surface treatment layer include a hard coat layer, an antireflection layer, an antistatic layer, and an antifouling layer. The method for forming the surface treatment layer is not particularly limited, and known methods can be used. The hard coat layer may be formed on one side or both sides of the protective film. By providing a hard coat layer, the protective film can be improved in hardness and scratch resistance. The hard coat layer is, for example, a cured layer of an active energy ray-curable resin, preferably an ultraviolet-curable resin. Examples of ultraviolet-curable resins include (meth)acrylic resins, silicone resins, polyester resins, urethane resins, amide resins, and epoxy resins. The hard coat layer may contain an additive to improve its strength. The additive is not particularly limited, and examples include inorganic fine particles, organic fine particles, and mixtures thereof. [Example]

[0133] The present invention will be described in more detail below with reference to examples and comparative examples. However, the present invention is not limited to the following examples. Furthermore, "%" and "parts" mean % by mass and parts by mass, respectively, unless otherwise specified.

[0134] <Preparation of polarizing film (P)> A 30 μm-thick polyvinyl alcohol film with an average degree of polymerization of approximately 2400 and a saponification degree of 99.9 mol% or more was immersed in pure water at 30°C, followed by an aqueous solution at 30°C containing iodine, potassium iodine, and water in a mass ratio of 0.02:2:100 to perform iodine dyeing (hereinafter also referred to as the iodine dyeing step). The polyvinyl alcohol film that had undergone the iodine dyeing step was then immersed in an aqueous solution at 56.5°C containing potassium iodide, boric acid, and water in a mass ratio of 12:5:100 to perform boric acid treatment (hereinafter also referred to as the boric acid treatment step). The polyvinyl alcohol film that had undergone the boric acid treatment step was washed with pure water at 8°C and then dried at 65°C to obtain a polarizing film (P) in which iodine was adsorbed and aligned in the polyvinyl alcohol. Stretching was performed during the iodine dyeing step and the boric acid treatment step. The total stretching ratio during this stretching was 5.3 times. The thickness after stretching was 12 μm.

[0135] <Preparation of Water-Based Adhesive (A)> An aqueous polyvinyl alcohol solution was prepared by dissolving 3 parts by mass of carboxyl-modified polyvinyl alcohol ("KL-318" manufactured by Kuraray Co., Ltd.) in 100 parts by mass of water. 1.5 parts by mass of a water-soluble polyamide epoxy resin ("Sumirez Resin 650 (30)" manufactured by Taoka Chemical Co., Ltd., solids concentration 30% by mass) was mixed with the resulting aqueous solution to obtain an aqueous adhesive (A).

[0136] <Adhesive layer (AD)> [Preparation of adhesive layer (AD1)] A reaction vessel equipped with a condenser, nitrogen inlet, thermometer, and stirrer was charged with a mixed solution of 100 parts ethyl acetate, 99.0 parts butyl acrylate, 0.5 parts 2-hydroxyethyl acrylate, and 0.5 parts acrylic acid. The air in the vessel was purged with nitrogen gas to remove oxygen, and the internal temperature was raised to 55°C. A solution of 0.12 parts azobisisobutyronitrile (polymerization initiator) in 10 parts ethyl acetate was then added in its entirety. After the addition of the polymerization initiator, the temperature was maintained for 1 hour. Ethyl acetate was then continuously added to the reaction vessel at a rate of 17.3 parts / hour while maintaining the internal temperature at 54-56°C. When the (meth)acrylic resin concentration reached 35% by mass, the ethyl acetate addition was stopped. The temperature was maintained for 6 hours after the start of the ethyl acetate addition. Finally, ethyl acetate was added to adjust the (meth)acrylic resin concentration to 20% by mass, preparing an acrylic resin solution. The resulting acrylic resin had a weight-average molecular weight Mw of 1.7 million and a molecular weight distribution Mw / Mn of 3.9. Mw and Mn were measured in terms of standard polystyrene using two Tosoh Corporation "TSKgel GMHHR-H(S)" columns connected in series in a GPC system, tetrahydrofuran as the eluent, a sample concentration of 2 mg / mL, a sample introduction amount of 100 μL, a temperature of 40°C, and a flow rate of 1 mL / min.

[0137] To 80 parts of the solids of this acrylic resin solution, 20 parts (solids) of a bifunctional acrylate (obtained from Shin-Nakamura Chemical Co., Ltd.; product number "A-DOG"), 2.5 parts (active ingredient basis) of a crosslinker (manufactured by Tosoh Corporation; product name "Coronate L" (a solution of tolylene diisocyanate and trimethylolpropane adduct in ethyl acetate (solids concentration 75% by mass)), 1.5 parts of a photoinitiator (manufactured by Ciba Specialty Chemicals; product name "Irgacure 500"), and 0.3 parts of a silane coupling agent (manufactured by Shin-Etsu Chemical Co., Ltd.; product name "KBM-403") were added, and ethyl acetate was added to bring the solids concentration to 13%, to obtain a pressure-sensitive adhesive composition. "A-DOG" is a diacrylate of an acetal compound of hydroxypivalaldehyde and trimethylolpropane, and has the following structure:

[0138] [ka]

[0139] The pressure-sensitive adhesive composition prepared above was applied to the release-treated surface of a release-treated polyethylene terephthalate film ("PLZ-383030" available from Lintec Corporation) using an applicator to a dry thickness of 5 μm, and then dried at 100°C for 1 minute to obtain a pressure-sensitive adhesive layer (AD1) laminated to a separator film. Next, the surface of the resulting pressure-sensitive adhesive layer (AD1) opposite the separator film was bonded to the release-treated surface of a release-treated polyethylene terephthalate film ("PLR-381031" available from Lintec Corporation). Subsequently, ultraviolet light was irradiated under the following conditions to obtain a pressure-sensitive adhesive layer (AD1) protected on both sides by separator films. (UV irradiation conditions) Fusion UV lamp system (manufactured by Fusion UV Systems) H bulb used Accumulated light output: 250mJ / cm 2

[0140] [Preparation of adhesive layer (AD2)] A reaction vessel equipped with a condenser, nitrogen inlet, thermometer, and stirrer was charged with a mixed solution of 81.8 parts ethyl acetate, 98.0 parts butyl acrylate, and 2.0 parts acrylic acid. The air in the vessel was purged with nitrogen gas to remove oxygen, and the internal temperature was raised to 55°C. A solution of 0.14 parts azobisisobutyronitrile (polymerization initiator) in 10 parts ethyl acetate was then added in its entirety. After the addition of the polymerization initiator, the temperature was maintained for 1 hour. Ethyl acetate was then continuously added to the reaction vessel at a rate of 17.3 parts / hour while maintaining the internal temperature at 54-56°C. The addition of ethyl acetate was stopped when the (meth)acrylic resin concentration reached 35% by mass, and the vessel was then maintained at this temperature for 12 hours. Finally, ethyl acetate was added to adjust the (meth)acrylic resin concentration to 20% by mass, preparing an acrylic resin solution. The resulting acrylic resin had a weight-average molecular weight Mw of 1.8 million and a molecular weight distribution Mw / Mn of 4.2. Mw and Mn were measured in terms of standard polystyrene using two Tosoh Corporation "TSKgel GMHHR-H(S)" columns connected in series in a GPC system, tetrahydrofuran as the eluent, a sample concentration of 2 mg / mL, a sample introduction amount of 100 μL, a temperature of 40°C, and a flow rate of 1 mL / min.

[0141] To 80 parts of the solid content of this acrylic resin solution, 20 parts (solid content) of a bifunctional acrylate (obtained from Shin-Nakamura Chemical Co., Ltd.; product number "A-DOG"), 3.0 parts (active ingredient basis) of a crosslinker (manufactured by Tosoh Corporation; product name "Coronate L" (an ethyl acetate solution of a trimethylolpropane adduct of tolylene diisocyanate (solid content concentration 75% by mass)), 1.5 parts of a photopolymerization initiator (manufactured by Ciba Specialty Chemicals; product name "Irgacure 500"), and 0.5 parts of a silane coupling agent (manufactured by Shin-Etsu Chemical Co., Ltd.; product name "KBM-403") were added, and ethyl acetate was further added to adjust the solid content to 13%, to obtain a pressure-sensitive adhesive composition.

[0142] The pressure-sensitive adhesive composition prepared above was applied to the release-treated surface of a release-treated polyethylene terephthalate film ("PLR-382150" available from Lintec Corporation) using an applicator to a dry thickness of 25 μm, and then dried at 100°C for 1 minute to obtain a pressure-sensitive adhesive layer (AD2) laminated to a separator film. The surface of the resulting pressure-sensitive adhesive layer opposite the separator film was then bonded to the release-treated surface of a release-treated polyethylene terephthalate film ("PLZ-381130" available from Lintec Corporation). Subsequently, ultraviolet light was irradiated under the following conditions to obtain a pressure-sensitive adhesive layer (AD2) protected on both sides by separator films. (UV irradiation conditions) Fusion UV lamp system (manufactured by Fusion UV Systems) D bulb used Accumulated light output: 1500mJ / cm 2

[0143] <Preparation of retardation layer (R1)> [Preparation of liquid crystal retardation layer (R1-1)] (Preparation of composition for forming photo-alignment film (O1-1)) A photo-alignment material (weight average molecular weight: 50,000, m:n = 50:50) having the following chemical structure was produced in accordance with the method described in JP 2021-196514 A. Two parts of the photo-alignment material and 98 parts of cyclopentanone (solvent) were mixed as components, and the resulting mixture was stirred at 80°C for 1 hour to prepare a composition for forming a photo-alignment film (O1-1).

[0144] Photoalignment material polymer: Compound represented by the following formula

[0145] [ka]

[0146] (Preparation of polymerizable liquid crystal compounds) Polymerizable liquid crystal compound (C1-1) and polymerizable liquid crystal compound (C1-2) having the following chemical structures were prepared. Polymerizable liquid crystal compound (C1-1) was prepared in the same manner as described in JP-A-2019-3177. Polymerizable liquid crystal compound (C1-2) was prepared in the same manner as described in JP-A-2009-173893.

[0147] Polymerizable liquid crystal compound (C1-1): a compound represented by the following formula:

[0148] [ka]

[0149] Polymerizable liquid crystal compound (C1-2): a compound represented by the following formula:

[0150] [ka]

[0151] A solution was obtained by dissolving 1 mg of polymerizable liquid crystal compound (C1-1) in 10 mL of chloroform. The obtained solution was placed in a measurement cell with an optical path length of 1 cm, and the measurement sample was placed in a UV-visible spectrophotometer (Shimadzu Corporation, "UV-2450") to measure the absorption spectrum. The wavelength at which the maximum absorbance was obtained was read from the obtained absorption spectrum, and the maximum absorption wavelength λmax in the wavelength range of 300 to 400 nm was 356 nm.

[0152] (Preparation of Retardation Layer-Forming Composition (Y1-1)) Polymerizable liquid crystal compound (C1-1) and polymerizable liquid crystal compound (C1-2) were mixed in a mass ratio of 90:10 to obtain a mixture. To 100 parts of the obtained mixture, 0.1 parts of a leveling agent "BYK-361N" (manufactured by BM Chemie) and 3 parts of a photopolymerization initiator "Irgacure OXE-03" (manufactured by BASF Japan Ltd.) were added. Furthermore, N-methyl-2-pyrrolidone (NMP) was added so that the solids concentration was 13%. This mixture was stirred at a temperature of 80°C for 1 hour to prepare a retardation layer-forming composition (Y1-1).

[0153] (Preparation of Liquid Crystal Retardation Layer (R1-1)) The photo-alignment film-forming composition (O1-1) was applied using a bar coater onto a substrate layer (B1-1) made of a biaxially oriented polyethylene terephthalate (PET) film (Diafoil, manufactured by Mitsubishi Plastics, Inc.). The resulting coating was dried at 120°C for 2 minutes and then cooled to room temperature to form a dry film. The resulting coating was then irradiated with 100 mJ of polarized ultraviolet light (313 nm standard) using a UV irradiation device (SPOT CURE SP-9, manufactured by Ushio Inc.) to obtain a photo-alignment film (D1-1). The film thickness of the photo-alignment film (D1-1) was measured using an ellipsometer M-220 manufactured by JASCO Corporation and was 100 nm.

[0154] The retardation layer-forming composition (Y1-1) was applied onto the obtained photo-alignment film (D1-1) using a bar coater to form a coating film. This coating film was dried by heating at 120°C for 2 minutes, and then cooled to room temperature to obtain a dried film. Next, a high-pressure mercury lamp ("Uniquer VB-15201BY-A" manufactured by Ushio Inc.) was used to expose the film to 500mJ / cm2 under a nitrogen atmosphere. 2 The dried film was irradiated with ultraviolet light (365 nm standard) to form an optically anisotropic layer (E1-1) in which the polymerizable liquid crystal compound was cured in a state where it was aligned horizontally relative to the substrate surface, and a liquid crystal retardation layer (R1-1) consisting of substrate layer (B1-1) / photo-alignment film (D1-1) / optically anisotropic layer (E1-1) was obtained. The film thickness of the optically anisotropic layer (E1-1) measured using a laser microscope LEXT OLS4100 manufactured by Olympus Corporation was 2.0 μm.

[0155] The optically anisotropic layer (E1-1) of the liquid crystal retardation layer (R1-1) was corona-treated and then attached to glass using a 25 μm pressure-sensitive adhesive manufactured by Lintec Corporation. The PET film was then peeled off and removed. The in-plane retardation values ​​for light with wavelengths of 450 nm, 550 nm, and 650 nm were measured using a KOBRA-WR manufactured by Oji Scientific Instruments. The in-plane retardation values ​​for light with wavelengths of 448.2 nm, 498.6 nm, 548.4 nm, 587.3 nm, 628.7 nm, and 748.6 nm were calculated using Cauchy's dispersion formula.

[0156] As a result, the in-plane retardation values ​​were Re(450)=122 nm, Re(550)=140 nm, and Re(650)=144 nm, and the relationship between the in-plane retardation values ​​at each wavelength was as follows:

[0157] Re(450) / Re(550)=0.87 Re(650) / Re(550)=1.03 (In the above, Re(450) represents the in-plane retardation value for light with a wavelength of 450 nm, Re(550) represents the in-plane retardation value for light with a wavelength of 550 nm, and Re(650) represents the in-plane retardation value for light with a wavelength of 650 nm.)

[0158] [Preparation of liquid crystal retardation layer (R1-2)] 100 parts of a polymerizable liquid crystal compound (C1-3) ("Paliocolor LC242", manufactured by BASF Japan Ltd.) having the following chemical structure, 0.1 parts of a leveling agent "BYK-361N" (manufactured by BYK-Chemie), and 2.5 parts of a photopolymerization initiator "Omnirad907" (manufactured by IGM Resin BV) were mixed. 400 parts of propylene glycol 1-monomethyl ether 2-acetate (PGME) were then added, and the mixture was stirred at a temperature of 80 ° C. for 1 hour to prepare a retardation layer-forming composition (Y1-2).

[0159] Polymerizable liquid crystal compound (C1-3):

[0160] [ka]

[0161] [Preparation of composition for forming photo-alignment film (O1-2)] As a composition for forming a vertical alignment film, 2-butoxyethanol was added to Sunever SE-610 (manufactured by Nissan Chemical Industries, Ltd.), a commercially available alignment polymer, so that the solid content was 1%, to obtain a composition for forming a photo-alignment film (O1-2).

[0162] [Preparation of Retardation Film (1)] One side of the base layer (B1-2) made of a cycloolefin polymer (COP) film (ZF14, manufactured by Zeon Corporation) was subjected to corona treatment using a corona treatment device (AGF-B10; manufactured by Kasuga Electric Co., Ltd.), and the photo-alignment film-forming composition (O1-2) was applied to the surface using a bar coater and dried at 90°C for 1 minute. The thickness of the resulting vertical alignment film (D1-2) was measured using a laser microscope and found to be 30 nm. Next, the retardation layer-forming composition (Y1-2) was applied to the vertical alignment film (D1-2) using a bar coater and dried at 90°C for 1 minute, and then exposed to 1000 mJ / cm2 under a nitrogen atmosphere using a high-pressure mercury lamp (Uniqure VB-15201BY-A, manufactured by Ushio Inc.). 2 The dried film was irradiated with ultraviolet light (365 nm reference) to form an optically anisotropic layer (E1-2). Thus, a liquid crystal retardation layer (R1-2) consisting of a base layer (B1-2), a vertical alignment film (D1-2), and an optically anisotropic layer (E1-2) was obtained. The thickness of the optically anisotropic layer (E1-2) was measured using a laser microscope and found to be 4.5 μm. The in-plane retardation value was measured using a KOBRA-WR manufactured by Oji Scientific Instruments. The results were Re(550) = 1 nm and Rth(550) = -70 nm. Therefore, the optical properties expressed by the following formula (9) were obtained. Note that the retardation value of the COP at a wavelength of 550 nm is approximately 0, so this does not affect the optical properties. nx≒ny <nz …(9)

[0163] [Preparation of retardation layer (R1)] (Preparation of active energy ray curable adhesive (S1)) The components shown below were mixed to prepare an active energy ray-curable adhesive (S1). 3',4'-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate (trade name: CEL2021P, manufactured by Daicel Corporation): 70 parts by mass Neopentyl glycol diglycidyl ether (product name: EX-211, manufactured by Nagase ChemteX Corporation): 20 parts by mass 2-Ethylhexyl glycidyl ether (product name: EX-121, manufactured by Nagase ChemteX Corporation): 10 parts by mass Cationic polymerization initiator (product name: CPI-100_50% solution, manufactured by San-Apro Co., Ltd.): 4.5 parts by mass (actual solid content: 2.25 parts by mass) 1,4-diethoxynaphthalene: 2 parts by mass

[0164] (Preparation of retardation layer (R1)) The liquid crystal retardation layer (R1-1) and the liquid crystal retardation layer (R1-2) were bonded together with an active energy ray curable adhesive (S1) (thickness 1 μm) so that the optically anisotropic layer surface (the surface opposite to the substrate layer) became the bonding surface. The active energy ray curable adhesive (S1) was cured by irradiating ultraviolet light to obtain a retardation layer (R1) with a substrate layer, which was laminated in the order of substrate layer (B1-1) / photo-alignment film (D1-1) / optically anisotropic layer (E1-1) / UV adhesive layer / optically anisotropic layer (E1-2) / photo-alignment film (D1-2) / substrate layer (B1-2).

[0165] The thickness of the laminate including the optically anisotropic layer (E1-1), the UV adhesive layer, and the optically anisotropic layer (E1-2) was 7.5 μm.

[0166] <Preparation of retardation layer (R2)> Two parts of polymer (1) having a number average molecular weight of 28,000 and represented by the following formula (1) were mixed with 98 parts of o-xylene, and the resulting mixture was stirred at 80°C for one hour to obtain a composition (O2) for forming a photo-alignment film.

[0167] [ka] [In the formula, Me represents a methyl group.]

[0168] [Preparation of polymerizable liquid crystal composition] A polymerizable liquid crystal compound represented by the following formula (C2-1) (86.0 parts), a polymerizable liquid crystal compound represented by the following formula (C2-2) (14.0 parts), a polyacrylate compound (leveling agent, manufactured by BYK-Chemie, trade name: BYK-361N) (0.12 parts), 2-dimethylamino-2-benzyl-1-(4-morpholinophenyl)butan-1-one (photopolymerization initiator, manufactured by Ciba Specialty Chemicals, trade name: Irgacure 369) (3.0 parts), and LALOMER LR9000 (trade name, manufactured by BASF Japan) (2.0 parts) were mixed. Anisole was then added to the mixture to a solids concentration of 9%. A polymerizable liquid crystal composition (A) containing the polymerizable liquid crystal compound (C2-1) and the polymerizable liquid crystal compound (C2-2) was obtained. The polymerizable liquid crystal compound (C2-1) was synthesized by the method described in JP-A No. 2010-31223. The maximum absorption wavelength λmax (LC) of the polymerizable liquid crystal compound (C2-1) measured in chloroform in the wavelength range of 300 to 400 nm was 350 nm.

[0169] Polymerizable liquid crystal compound (C2-1): a compound represented by the following formula:

[0170] [ka]

[0171] Polymerizable liquid crystal compound (C2-2): a compound represented by the following formula:

[0172] [ka]

[0173] [Preparation of Retardation Layer-Forming Composition (Y2)] 86.0 parts of polymerizable liquid crystal compound (C2-1), 14.0 parts of polymerizable liquid crystal compound (C2-2), 0.12 parts of a polyacrylate compound (leveling agent / BYK-361N; manufactured by BYK-Chemie), 3.0 parts of 2-dimethylamino-2-benzyl-1-(4-morpholinophenyl)butan-1-one (photopolymerization initiator / Irgacure 369; manufactured by Ciba Specialty Chemicals), and 2.0 parts of LALOMER LR9000 (manufactured by BASF Japan) were mixed. Anisole was added to a solids concentration of 9%. The mixture was stirred at 80°C for 1 hour to obtain a retardation layer-forming composition (Y2) containing the polymerizable liquid crystal compound (C2-1) and the polymerizable liquid crystal compound (C2-2).

[0174] [Preparation of retardation layer (R2)] A triacetyl cellulose film (KC4CZ-TAC, manufactured by Konica Minolta, Inc., thickness 40 μm) was treated once using a corona treatment device (AGF-B10; manufactured by Kasuga Electric Co., Ltd.) under conditions of an output of 0.3 kW and a treatment speed of 3 m / min. The corona-treated surface was coated with the photoalignment film-forming composition (O2) using a bar coater, dried at 90°C for 1 minute, and then irradiated with 100 mJ / cm using a polarized UV irradiation device (SPOT CURE SP-7 with polarizing film unit; manufactured by Ushio Inc.). 2 The resulting photo-alignment film (D2) was exposed to polarized UV light with an integrated light amount of 10 ...

[0175] Subsequently, the retardation layer-forming composition (Y2) was applied onto the photo-alignment film (D2) using a bar coater and dried for 1 minute at 120° C. Thereafter, ultraviolet light was irradiated from the side on which the retardation layer-forming composition (Y2) was applied using a high-pressure mercury lamp (Uniquer VB-15201BY-A; manufactured by Ushio Inc.) (under a nitrogen atmosphere, cumulative light intensity at a wavelength of 313 nm: 500 mJ / cm ). 2), and then irradiated with ultraviolet light from the same side under the same conditions to form an optically anisotropic layer (E2). In this way, a retardation layer (R2) was formed, which was a laminate consisting of a triacetyl cellulose film (base layer (B2)), a photo-alignment film (D2), and an optically anisotropic layer (E2). The thickness of the resulting optically anisotropic layer (E2) was measured using a laser microscope (LEXT; manufactured by Olympus Corporation) and found to be 2.7 μm. The internal haze of the laminate of the base layer (B2), photo-alignment film (D2), and optically anisotropic layer (E2) was 0.79.

[0176] <Preparation of retardation layer (R3)> The liquid crystal retardation layer (R1-1) prepared above is used as the retardation layer (R3).

[0177] <How to measure haze> The object to be measured (antiglare film or a layer including a protective film and an optically anisotropic layer) was attached to a glass substrate using an optically transparent adhesive, and the haze was measured using a haze meter "HM-150" manufactured by Murakami Color Research Laboratory Co., Ltd., which conforms to JIS K7136. When the object to be measured was an antiglare film, the substrate side for forming the antiglare layer was attached to the glass surface, and light was incident from the antiglare layer side to measure. When the object to be measured was a layer including a protective film and an optically anisotropic layer, the optically anisotropic layer side was attached to the glass surface, and light was incident from the protective film side to measure.

[0178] In the above, the "layer including a protective film and an optically anisotropic layer" to be measured was prepared as follows: The retardation layer (R2) prepared as above was used as it was.

[0179] (Method for producing a layer including a protective film and an optically anisotropic layer in the retardation layer (R1)) The substrate layer (B1-1) of the liquid crystal retardation layer (R1-1) in the retardation layer (R1) was peeled off to expose the photo-alignment film (D1-1). The exposed photo-alignment film (D1-1) and a protective film (F1) were bonded together using an adhesive layer (AD1). This resulted in a laminate having a laminate structure of protective film (F1) / adhesive layer (AD1) / photo-alignment film (D1-1) / optically anisotropic layer (E1-1) / UV adhesive layer / optically anisotropic layer (E1-2) / photo-alignment film (D1-2) / substrate layer (B1-2). The base layer (B1-2) was peeled off from the laminate thus obtained, yielding a laminate having a laminated structure of protective film (F1) / adhesive layer (AD1) / photo-alignment film (D1-1) / optically anisotropic layer (E1-1) / UV adhesive layer / optically anisotropic layer (E1-2) / photo-alignment film (D1-2). This is the "layer containing a protective film and an optically anisotropic layer" when a retardation layer (R1) is used. The internal haze of the laminate of protective film (F1) / adhesive layer (AD1) / photo-alignment film (D1-1) / optically anisotropic layer (E1-1) / UV adhesive layer / optically anisotropic layer (E1-2) / photo-alignment film (D1-2) was 1.21.

[0180] (Method for producing a layer including a protective film and an optically anisotropic layer in the retardation layer (R3)) The surface of the optically anisotropic layer (E1-1) of the retardation layer (R3) (= liquid crystal retardation layer (R1-1)) prepared above and the surface of the protective film (F1) prepared above were bonded using an adhesive layer (AD1). As a result, a laminate having a laminated structure of protective film (F1) / adhesive layer (AD1) / optically anisotropic layer (E1-1) / photo-alignment film (D1-1) / base layer (B1-1) was obtained. The base layer (B1-1) was peeled off from the laminate obtained in this way, and a laminate having a laminated structure of protective film (F1) / adhesive layer (AD1) / optically anisotropic layer (E1-1) / photo-alignment film (D1-1) was obtained. This is the "layer including a protective film and an optically anisotropic layer" when a retardation layer (R3) is used. The internal haze of the laminate of protective film (F1) / adhesive layer (AD1) / optically anisotropic layer (E1-1) / photo-alignment film (D1-1) was 0.33.

[0181] <Method for measuring ultraviolet absorption (or transmittance) (380 nm)> The measurement object (anti-glare film or protective film) was cut into a size of 30 mm x 30 mm, and the transmittance [%] was measured in the wavelength range of 200 to 510 nm. For the measurement, a UV-2450 ultraviolet-visible spectrophotometer manufactured by Shimadzu Corporation was used.

[0182] Example 1 [Preparation of anti-glare film (AG1)] As shown below, an antiglare layer was formed on the substrate layer for forming an antiglare layer to obtain an antiglare film (AG1).

[0183] Antiglare layer-forming coating solution 1 having the following formulation was applied to a 25 μm-thick triacetyl cellulose substrate (Konica Minolta, Inc., "KC2UA," 25 μm thick) as the antiglare layer-forming substrate layer (AG1-2), and the coating solution was dried at an air speed of 5 m / s and 70°C for 30 seconds. After that, ultraviolet light was irradiated from the side on which the antiglare layer-forming coating solution was applied (nitrogen atmosphere, integrated light intensity at a wavelength of 313 nm: 100 mJ / cm). 2 ) and curing the coating film to form an antiglare layer (AG1-1), thereby obtaining an antiglare film (AG1). The thickness of the antiglare layer (AG1-1) was 3.5 μm. When the antiglare film (AG1) is laminated to another layer, the antiglare layer-forming substrate layer (AG1-2) side is laminated. --------------------------------------------------------------------------- (Anti-glare layer forming coating solution 1) Acrylic-styrene copolymer particles (organic fine particles, average primary particle size 2.0 μm, refractive index 1.52, manufactured by Sekisui Plastics Co., Ltd.): 2.0 parts by mass Fumed silica (inorganic fine particles, octylsilane treated, average primary particle size 12 nm, manufactured by Nippon Aerosil Co., Ltd.): 2.0 parts by mass Pentaerythritol tetraacrylate (PETTA) (product name "PETA", manufactured by Daicel-Cytec Co., Ltd.): 60 parts by weight Urethane acrylate (product name "UV1700B", manufactured by Nippon Synthetic Chemical Industry Co., Ltd.): 40 parts by weight Polymerization initiator (product name "Irgacure 184", manufactured by BASF Japan Ltd.): 5 parts by mass Polyether-modified silicone (product name "TSF4460", manufactured by Momentive Performance Materials): 0.025 parts by mass Toluene: 105 parts by mass Isopropyl alcohol: 30 parts by weight Cyclohexanone: 15 parts by mass ---------------------------------------------------------------------------

[0184] [Preparation of polarizing plates] An antiglare film (AG1) was attached to one side of the prepared polarizing film (P) via a water-based adhesive (A), and a protective film (F1) (a triacetyl cellulose film (KC4CZ-TAC, manufactured by Konica Minolta, Inc., thickness 40 μm)) was attached to the other side via a water-based adhesive (A) using a roll laminator. The resulting film was then dried at 80°C for 3 minutes to obtain a linear polarizing plate (PL1).

[0185] [Preparation of circular polarizer] The base layer (B1-1) of the liquid crystal retardation layer (R1-1) in the retardation layer (R1) prepared above was peeled off to expose the photo-alignment film (D1-1). The exposed photo-alignment film (D1-1) was bonded to the protective film (F1) surface of the linear polarizer (PL1) prepared above using an adhesive layer (AD1). The retardation layer (R1) and the linear polarizer (PL1) were bonded together so that the angle between the slow axis of the optically anisotropic layer (E1-1) and the transmission axis of the polarizer was 45° counterclockwise relative to the transmission axis of the polarizer. This resulted in a circularly polarizing plate having a laminated structure of antiglare film (AG1) / adhesive layer / polarizing film (P) / adhesive layer / protective film (F1) / pressure-sensitive adhesive layer (AD1) / photo-alignment film (D1-1) / optically anisotropic layer (E1-1) / UV adhesive layer / optically anisotropic layer (E1-2) / photo-alignment film (D1-2) / base layer (B1-2).

[0186] The base layer (B1-2) was peeled off from the circularly polarizing plate prepared above. A separator film was attached to the exposed surface of the photo-alignment film (D1-2) via the adhesive layer (AD2). This resulted in a circularly polarizing plate with a separator film having a laminate structure of antiglare film (AG1) / adhesive layer / polarizing film (P) / adhesive layer / protective film (F1) / adhesive layer (AD1) / photo-alignment film (D1-1) / optically anisotropic layer (E1-1) / UV adhesive layer / optically anisotropic layer (E1-2) / photo-alignment film (D1-2) / adhesive layer (AD2) / separator film.

[0187] [evaluation] (glare) The separator film was peeled off from the circular polarizer with the separator film, and the plate was attached to an organic electroluminescence display panel via the exposed adhesive layer (AD2). With a green color displayed on the image display device, the antiglare film side was visually observed from a distance of 30 cm. Glare on the surface (such as haze or flickering on the display screen) was evaluated sensorily. The evaluation criteria were as follows: Rating: A + ": There is absolutely no glare, and it's not noticeable when the screen is turned on. Rating "A": There is almost no glare, and it is not noticeable when the screen is turned on. Rating "B": Glare appears occasionally, but does not cause any problems when used as a liquid crystal display device. Rating "C": Glare appears frequently, but does not cause any problems when used as a liquid crystal display device. Rating "D": Glare is constantly present and the screen becomes unclear, making it difficult to use.

[0188] (Anti-glare) The separator film was peeled off from the circular polarizing plate with the separator film, and the plate was attached to an organic electroluminescence display panel via the exposed adhesive layer (AD2). With nothing displayed on the display screen, a three-wavelength fluorescent lamp was turned on above the surface of the antiglare layer, and the light was reflected by the surface. The reflected light was visually observed to evaluate the antiglare properties. The evaluation criteria are as follows: Rating: "Yes": The visible outline of the fluorescent light was blurred. Evaluation "None": The visible outline of the fluorescent light was not blurred at all.

[0189] (exterior) The separator film was peeled off from the circular polarizing plate with the separator film, and the plate was attached to an organic electroluminescence display panel via the exposed adhesive layer (AD2). With the image display device in a green display state, a three-wavelength fluorescent lamp was turned on above the surface on the antiglare layer side, and the light was reflected by that surface. In this state, the antiglare film side was visually observed from a distance of 30 cm. The appearance of the image display device at this time was subjected to a sensory evaluation. The evaluation criteria are as follows: Rating "A": High anti-glare properties, suppressing reflection of external light while providing clear visibility. There was almost no glare. Rating "B": Sufficient anti-glare properties were achieved, and clear visibility was obtained while suppressing reflection of external light. There was also little glare. Evaluation "C": The anti-glare properties were somewhat insufficient, but clear visibility was obtained.

[0190] (Polarizer deterioration) The transmittance Ty of the circularly polarizing plate obtained in the examples was measured using a spectrophotometer (manufactured by JASCO Corporation, product name "V-7100"). The rate of change in Ty between before and after 100 hours of exposure was measured using an ultraviolet fade tester (device name: ultraviolet fade meter tester U48, manufactured by Suga Test Instruments Co., Ltd.). Evaluation: "Good": The rate of change was 0.5% or less. Evaluation: "Fair": The rate of change exceeded 0.5%.

[0191] <Example 2> [Preparation of circular polarizer] The retardation layer (R2), polarizing film (P), and antiglare film (AG1) prepared above were laminated in this order, and an aqueous adhesive was poured into each of them so that the triacetyl cellulose film (base layer (B2)) side of the retardation layer (R2) was in contact with the polarizing film (P), and so that the surface of the polarizing film (P) opposite the retardation layer (R2) was in contact with the antiglare film (AG1), and the two were laminated using nip rolls. At this time, the transmission axis of the polarizing film (P) and the slow axis of the optically anisotropic layer (E2) of the retardation layer (R2) were aligned at 45° counterclockwise with respect to the transmission axis of the polarizing film. After drying at 60°C for 2 minutes, a circular polarizing plate having a laminate structure of antiglare film (AG1) / adhesive layer / polarizing film (P) / adhesive layer / base layer (B2) / photoalignment film (D2) / optically anisotropic layer (E2) was obtained.

[0192] A separator film was attached to the optically anisotropic layer (E2) of the circular polarizer prepared above via a pressure-sensitive adhesive layer (AD2), thereby obtaining a circular polarizer with a separator film having a laminate structure of antiglare film (AG1) / adhesive layer / polarizing film (P) / adhesive layer / substrate layer (B2) / photoalignment film (D2) / optically anisotropic layer (E2) / adhesive layer (AD2) / separator film.

[0193] Example 3 [Preparation of circular polarizer] The optically anisotropic layer (E1-1) of the retardation layer (R3) (=liquid crystal retardation layer (R1-1)) prepared above was bonded to the protective film (F1) of the linear polarizer (PL1) prepared above using a pressure-sensitive adhesive layer (AD1). The retardation layer (R3) and the linear polarizer (PL1) were bonded together so that the angle between the slow axis of the optically anisotropic layer (E1-1) and the transmission axis of the polarizing film was 135° counterclockwise relative to the transmission axis of the polarizing film. This resulted in a circular polarizer having a laminate structure of antiglare film (AG1) / adhesive layer / polarizing film (P) / adhesive layer / protective film (F1) / pressure-sensitive adhesive layer (AD1) / optically anisotropic layer (E1-1) / photoalignment film (D1-1) / substrate layer (B1-1).

[0194] The base layer (B1-1) was peeled off from the circularly polarizing plate prepared above. A separator film was attached to the exposed surface of the photo-alignment film (D1-1) via the adhesive layer (AD2). This resulted in a circularly polarizing plate with a separator film having a laminated structure of antiglare film (AG1) / adhesive layer / polarizing film (P) / adhesive layer / protective film (F1) / adhesive layer (AD1) / optically anisotropic layer (E1-1) / photo-alignment film (D1-1) / adhesive layer (AD2) / separator film.

[0195] Example 4 A circularly polarizing plate with a separator film of Example 4 was obtained in the same manner as in Example 1, except that the antiglare layer forming coating solution 1 was changed to the antiglare layer forming coating solution 2 below, and an antiglare layer (AG2-1) having a film thickness of 2.9 μm was formed to obtain an antiglare film (AG2). --------------------------------------------------------------------------- (Anti-glare layer forming coating solution 2) Acrylic-styrene copolymer particles (organic fine particles, average primary particle size 3.5 μm, refractive index 1.52, manufactured by Sekisui Plastics Co., Ltd.): 2.0 parts by mass Fumed silica (inorganic fine particles, hexamethyldisilazane treated, average primary particle size 50 nm, manufactured by Nippon Aerosil Co., Ltd.): 3.0 parts by mass Pentaerythritol tetraacrylate (PETTA) (product name "PETA", manufactured by Daicel-Cytec Co., Ltd.): 60 parts by weight Urethane acrylate (product name "UV1700B", manufactured by Nippon Synthetic Chemical Industry Co., Ltd.): 40 parts by weight Polymerization initiator (product name "Irgacure 184", manufactured by BASF Japan Ltd.): 5 parts by mass Polyether-modified silicone (product name "TSF4460", manufactured by Momentive Performance Materials): 0.025 parts by mass Hydroxyphenyltriazine-based ultraviolet absorber (product name "Tinuvin 477", manufactured by BASF Japan Ltd., maximum absorption wavelength: 356 nm): 10 parts by mass 1.0 parts by weight of cyanine dye (product name "NK-9994", manufactured by Hayashibara Co., Ltd., maximum absorption wavelength: 405 nm) Toluene: 105 parts by mass Isopropyl alcohol: 30 parts by weight Cyclohexanone: 15 parts by mass ---------------------------------------------------------------------------

[0196] <Example 5> The circularly polarizing plate with separator film of Example 5 was obtained in the same manner as in Example 2, except that the antiglare layer forming coating solution 1 was changed to the above-mentioned antiglare layer forming coating solution 2, and an antiglare layer (AG2-1) with a film thickness of 2.9 μm was formed to obtain an antiglare film (AG2).

[0197] Example 6 The circularly polarizing plate with separator film of Example 6 was obtained in the same manner as in Example 3, except that the antiglare layer forming coating solution 1 was changed to the above-mentioned antiglare layer forming coating solution 2, and an antiglare layer (AG2-1) with a film thickness of 2.9 μm was formed to obtain an antiglare film (AG2).

[0198] Example 7 A circularly polarizing plate with a separator film of Example 7 was obtained in the same manner as in Example 4, except that the thickness of the protective film attached to the polarizing film (P) was changed to 25 μm.

[0199] Example 8 A circularly polarizing plate with a separator film of Example 8 was obtained in the same manner as in Example 5, except that the thickness of the base layer (B2) was changed to 25 μm.

[0200] Example 9 A circularly polarizing plate with a separator film of Example 9 was obtained in the same manner as in Example 6, except that the thickness of the protective film attached to the polarizing film (P) was changed to 25 μm.

[0201] Example 10 A circularly polarizing plate with a separator film of Example 10 was obtained in the same manner as in Example 1, except that the antiglare layer forming coating solution 1 was changed to the antiglare layer forming coating solution 3 below, and an antiglare layer (AG3-1) with a film thickness of 5.9 μm was formed to obtain an antiglare film (AG3). --------------------------------------------------------------------------- (Anti-glare layer forming coating solution 3) Acrylic-styrene copolymer particles (organic fine particles, average primary particle size 3.5 μm, refractive index 1.52, manufactured by Sekisui Plastics Co., Ltd.): 4.0 parts by mass Fumed silica (inorganic fine particles, octylsilane treated, average primary particle size 12 nm, manufactured by Nippon Aerosil Co., Ltd.): 4.0 parts by mass Pentaerythritol tetraacrylate (PETTA) (product name "PETA", manufactured by Daicel-Cytec Co., Ltd.): 60 parts by weight Urethane acrylate (product name "UV1700B", manufactured by Nippon Synthetic Chemical Industry Co., Ltd.): 40 parts by weight Polymerization initiator (product name "Irgacure 184", manufactured by BASF Japan Ltd.): 5 parts by mass Polyether-modified silicone (product name "TSF4460", manufactured by Momentive Performance Materials): 0.025 parts by mass Hydroxyphenyltriazine-based ultraviolet absorber (product name "Tinuvin 477", manufactured by BASF Japan Ltd., maximum absorption wavelength: 356 nm): 10 parts by mass 1.0 parts by weight of cyanine dye (product name "NK-9994", manufactured by Hayashibara Co., Ltd., maximum absorption wavelength: 405 nm) Toluene: 105 parts by mass Isopropyl alcohol: 30 parts by weight Cyclohexanone: 15 parts by mass ---------------------------------------------------------------------------

[0202] Example 11 A circularly polarizing plate with a separator film of Example 11 was obtained in the same manner as in Example 2, except that the antiglare layer forming coating solution 1 was changed to the above-mentioned antiglare layer forming coating solution 3, and an antiglare layer (AG3-1) with a film thickness of 5.9 μm was formed to obtain an antiglare film (AG3).

[0203] Example 12 A circularly polarizing plate with a separator film of Example 12 was obtained in the same manner as in Example 3, except that the antiglare layer forming coating solution 1 was changed to the above-mentioned antiglare layer forming coating solution 3, and an antiglare layer (AG3-1) with a film thickness of 5.9 μm was formed to obtain an antiglare film (AG3).

[0204] Example 13 A circularly polarizing plate with a separator film of Example 13 was obtained in the same manner as Example 1, except that the substrate layer for forming the antiglare layer was changed to a 40 μm thick triacetyl cellulose substrate (KC4UYATAC manufactured by Konica Minolta, Inc., thickness 40 μm) to obtain an antiglare film (AG4).

[0205] Example 14 A circularly polarizing plate with a separator film of Example 14 was obtained in the same manner as Example 2, except that the substrate layer for forming the antiglare layer was changed to a 40 μm thick triacetyl cellulose substrate (KC4UYATAC manufactured by Konica Minolta, Inc., thickness 40 μm) to obtain an antiglare film (AG4).

[0206] Example 15 A circularly polarizing plate with a separator film of Example 15 was obtained in the same manner as Example 3, except that the substrate layer for forming the antiglare layer was changed to a 40 μm thick triacetyl cellulose substrate (KC4UYATAC manufactured by Konica Minolta, Inc., thickness 40 μm) to obtain an antiglare film (AG4).

[0207] <Comparative Example 1> A circularly polarizing plate with a separator film of Comparative Example 1 was obtained in the same manner as in Example 13, except that no antiglare layer was provided.

[0208] <Comparative Example 2> A circularly polarizing plate with a separator film of Comparative Example 2 was obtained in the same manner as in Example 3, except that the antiglare layer-forming coating solution 1 was changed to the antiglare layer-forming coating solution 4 below, and an antiglare layer (AG6-1) having a film thickness of 9.3 μm was formed to obtain an antiglare film (AG6). --------------------------------------------------------------------------- (Anti-glare layer forming coating solution 4) Acrylic-styrene copolymer particles (organic fine particles, average primary particle size 5.0 μm, refractive index 1.52, manufactured by Sekisui Plastics Co., Ltd.): 18.0 parts by mass Fumed silica (inorganic fine particles, octylsilane treated, average primary particle size 5 nm, manufactured by Nippon Aerosil Co., Ltd.): 3.0 parts by mass Pentaerythritol tetraacrylate (PETTA) (product name "PETA", manufactured by Daicel-Cytec Co., Ltd.): 60 parts by weight Urethane acrylate (product name "UV1700B", manufactured by Nippon Synthetic Chemical Industry Co., Ltd.): 40 parts by weight Polymerization initiator (product name "Irgacure 184", manufactured by BASF Japan Ltd.): 5 parts by mass Polyether-modified silicone (product name "TSF4460", manufactured by Momentive Performance Materials): 0.025 parts by mass Hydroxyphenyltriazine-based ultraviolet absorber (product name "Tinuvin 477", manufactured by BASF Japan Ltd., maximum absorption wavelength: 356 nm): 10 parts by mass 1.0 parts by weight of cyanine dye (product name "NK-9994", manufactured by Hayashibara Co., Ltd., maximum absorption wavelength: 405 nm) Toluene: 105 parts by mass Isopropyl alcohol: 30 parts by weight Cyclohexanone: 15 parts by mass ---------------------------------------------------------------------------

[0209] Example 16 Example 16 is an embodiment in which the circularly polarizing plate with a separator film produced in Example 2 has an intervening layer between the antiglare film (AG1) and the polarizing film (P).

[0210] [Preparation of triacetyl cellulose with a UV absorber-containing hard coat layer] A triacetyl cellulose (TAC) film having a UV absorber-containing hard coat layer (hereinafter, sometimes referred to as "NUV-HC layer") as a surface treatment layer was prepared.

[0211] (Preparation of Surface Treatment Layer Composition) As a surface treatment layer composition, 20 parts of EBECRYL4858 (manufactured by Daicel-Allnex Co., Ltd.), 0.80 parts of UVA-01 synthesized in Synthesis Example 1 below, 0.21 parts of Irgacure-184 (manufactured by BASF Japan Ltd.), 26 parts of cyclopentanone (manufactured by Kanto Chemical Co., Ltd.), and 24 parts of N-methyl-2-pyrrolidone (manufactured by Kanto Chemical Co., Ltd.) were mixed and stirred at room temperature for 2 hours to obtain a uniform solution.

[0212] (Synthesis Example 1) A 200 mL four-neck flask equipped with a Dimroth condenser and thermometer was conditioned under a nitrogen atmosphere and charged with 10 g of UVA-M-02 powder, a compound represented by the formula below (synthesized with reference to patent document (JP 2014-194508 A)), 3.7 g of acetic anhydride (manufactured by Wako Pure Chemical Industries, Ltd.), 5.8 g of 2-ethoxyethyl cyanoacetate (manufactured by Tokyo Chemical Industry Co., Ltd.), and 60 g of acetonitrile (manufactured by Wako Pure Chemical Industries, Ltd.). The mixture was stirred with a magnetic stirrer. At an internal temperature of 25°C, 4.7 g of N,N-diisopropylethylamine (hereinafter abbreviated as "DIPEA"; manufactured by Tokyo Chemical Industry Co., Ltd.) was added dropwise over 1 hour. After completion of the addition, the mixture was maintained at 25°C for an additional 2 hours. After the reaction was complete, the acetonitrile was removed using a vacuum evaporator. Toluene was added to the resulting oil, and the resulting insoluble components were removed by filtration. The filtrate was concentrated again using a vacuum evaporator. The concentrated solution was purified by column chromatography (silica gel) and recrystallized from toluene to obtain the target compound. The crystals were dried under reduced pressure at 60°C to obtain 5.2 g of compound UVA-01 as a yellow powder. The yield was 65%. Furthermore, the absorption maximum wavelength (λmax) of UVA-01 was measured using a spectrophotometer UV-3150 (Shimadzu Corporation). The results were λmax = 389 nm (in 2-butanone), ε(400) = 125 L / (g cm), and ε(420) / ε(400) = 0.0153.

[0213] and, 1 H-NMR analysis revealed the following peaks, confirming that compound UVA-01 was produced. 1H-NMR(CDCl3)δ:1.21(t, 3H), 2.10(quIn.2H), 2.98-3.04(m, 5H), 3.54-3.72(m, 6H), 4.31(t, 2H), 5.53(d, 2H), 7.93(d, 2H)

[0214] [ka]

[0215] (Formation of surface treatment layer) The surface treatment layer composition was applied to a 25 μm-thick triacetyl cellulose film using a wire bar so that the film thickness after curing would be 8 μm, forming a coating film. Dry air at 70°C was passed through the formed coating film at a flow rate of 0.5 m / s for 30 seconds to evaporate the solvent, and ultraviolet light was applied in a nitrogen atmosphere (oxygen concentration 200 ppm or less) at an integrated light intensity of 200 mJ / cm. 2 The surface treatment layer (NUV-HC layer) was formed by irradiating and curing the film so that the transmittance at 450 nm was 90%, the transmittance at 420 nm was 50%, and the transmittance at 400 nm was 0%. This resulted in transparent protective film 1, a triacetyl cellulose film having a NUV-HC layer. The thickness of transparent protective film 1 was 33 μm. The transmittance at 380 nm of transparent protective film 1 was 0%.

[0216] [Preparation of circular polarizer] The retardation layer (R2), polarizing film (P), and triacetyl cellulose with a UV-absorber-containing hard coat layer prepared above were laminated in this order. An aqueous adhesive was poured into the layers so that the triacetyl cellulose film side of the retardation layer (R2) contacted the polarizing film (P), and the opposite side of the retardation layer (R2) of the polarizing film (P) contacted the triacetyl cellulose film side of the triacetyl cellulose with a UV-absorber-containing hard coat layer. The layers were then nip-rolled together. The absorption axis of the polarizing film (P) and the slow axis of the optically anisotropic layer (E2) of the retardation layer (R2) were aligned at 45°. The layers were dried at 60°C for 2 minutes to obtain a circularly polarizing plate having a laminate structure of triacetyl cellulose with a UV-absorber-containing hard coat layer / adhesive layer / polarizing film (P) / adhesive layer / substrate layer (B2) / photoalignment film (D2) / optically anisotropic layer (E2).

[0217] Next, an antiglare film (AG1) was attached to the triacetylcellulose with UV absorber-containing hard coat layer of the circular polarizer prepared above via an adhesive layer (AD1), thereby obtaining a circular polarizer having a laminate structure of antiglare film (AG1) / adhesive layer (AD1) / triacetylcellulose with UV absorber-containing hard coat layer / adhesive layer / polarizing film (P) / adhesive layer / substrate layer (B2) / photoalignment film (D2) / optically anisotropic layer (E2).

[0218] Next, a separator film was attached to the optically anisotropic layer (E2) of the circularly polarizing plate prepared above via an adhesive layer (AD2), thereby obtaining a circularly polarizing plate with a separator film having a laminate structure of antiglare film (AG1) / adhesive layer (AD1) / triacetyl cellulose with a UV absorber-containing hard coat layer / adhesive layer / polarizing film (P) / adhesive layer / substrate layer (B2) / photoalignment film (D2) / optically anisotropic layer (E2) / adhesive layer (AD2) / separator film.

[0219] Example 17 Example 17 is an embodiment in which the type of retardation layer in the separator film-attached circular polarizing plate produced in Example 16 was changed.

[0220] [Preparation of polarizing plates] A triacetyl cellulose film with a UV absorber-containing hard coat layer similar to that used in Example 16 was laminated to one side of the polarizing film (P) via a water-based adhesive, and a protective film (F1) was laminated to the side opposite the triacetyl cellulose film with a UV absorber-containing hard coat layer via a water-based adhesive using a roll laminator. After that, the film was dried at 80°C for 3 minutes to obtain a linear polarizing plate (PL2-1).

[0221] (Preparation of polarizing plate with second surface treatment layer) An antiglare film (AG1) was attached to the triacetyl cellulose film with a UV absorber-containing hard coat layer of the linear polarizer (PL2) prepared above via an adhesive layer (AD1), thereby obtaining a linear polarizer (PL2-2) having a laminated structure of antiglare film (AG1) / adhesive layer (AD1) / triacetyl cellulose with a UV absorber-containing hard coat layer / adhesive layer / polarizing film (P) / adhesive layer / protective film (F1).

[0222] [Preparation of circular polarizer] The protective film (F1) side of the linear polarizer (PL2-2) prepared above was bonded to the optically anisotropic layer (E1-1) side of the retardation layer (R3) (=liquid crystal retardation layer (R1-1)) via the adhesive layer (AD1). This resulted in a circular polarizer having a laminate structure of antiglare film (AG1) / adhesive layer (AD1) / triacetyl cellulose with a UV absorber-containing hard coat layer / adhesive layer / polarizing film (P) / adhesive layer / protective film (F1) / adhesive layer (AD1) / optically anisotropic layer (E1-1) / photoalignment film (D1-1) / substrate layer (B1-1).

[0223] Next, the base layer (B1-1) was peeled off from the circularly polarizing plate prepared above. A separator film was attached to the exposed surface of the photo-alignment film (D1-1) via the adhesive layer (AD2). This resulted in a circularly polarizing plate with a separator film having a laminate structure of antiglare film (AG1) / adhesive layer (AD1) / triacetyl cellulose with a UV absorber-containing hard coat layer / adhesive layer / polarizing film (P) / adhesive layer / protective film (F1) / optically anisotropic layer (E1-1) / photo-alignment film (D1-1) / adhesive layer (AD2) / separator film.

[0224] Example 18 A circularly polarizing plate with a separator film of Example 18 was obtained in the same manner as in Example 16, except that the antiglare layer forming coating solution 1 was changed to the antiglare layer forming coating solution 5 below, and an antiglare layer (AG5-1) having a film thickness of 5.9 μm was formed to obtain an antiglare film (AG5). --------------------------------------------------------------------------- (Anti-glare layer forming coating solution 5) Acrylic-styrene copolymer particles (organic fine particles, average primary particle size 2.0 μm, refractive index 1.52, manufactured by Sekisui Plastics Co., Ltd.): 3.0 parts by mass Fumed silica (inorganic fine particles, hexamethyldisilazane treated, average primary particle size 50 nm, manufactured by Nippon Aerosil Co., Ltd.): 2.0 parts by mass Pentaerythritol tetraacrylate (PETTA) (product name "PETA", manufactured by Daicel-Cytec Co., Ltd.): 60 parts by weight Ethoxy isocyanurate-modified diacrylate (product name "M-215", manufactured by Toagosei Co., Ltd.): 40 parts by weight Polymerization initiator (product name "Irgacure 184", manufactured by BASF Japan Ltd.): 5 parts by mass Polyether-modified silicone (product name "TSF4460", manufactured by Momentive Performance Materials): 0.025 parts by mass Toluene: 120 parts by mass Methyl isobutyl ketone (MIBK): 30 parts by weight ---------------------------------------------------------------------------

[0225] Example 19 The circularly polarizing plate with separator film of Example 19 was obtained in the same manner as in Example 17, except that the antiglare layer forming coating solution 1 was changed to the above-mentioned antiglare layer forming coating solution 5, and an antiglare layer (AG5-1) with a film thickness of 5.9 μm was formed to obtain an antiglare film (AG5).

[0226] Glare and antiglare properties were evaluated for Examples 2 to 19 and Comparative Examples 1 and 2 in the same manner as in Example 1. The laminate structures, haze values, absorption of light at 380 nm, and evaluations for Examples 1 to 19 and Comparative Examples 1 and 2 are shown in Tables 1 to 3.

[0227] [Table 1]

[0228] [Table 2]

[0229] [Table 3]

[0230] The embodiment without an antiglare layer (Comparative Example 1) had no antiglare properties, and the embodiment with an antiglare layer but an antiglare film with a haze of 8.0% (Comparative Example 2) produced strong glare.

[0231] In the antiglare film having a haze of 0.9% (Examples 1 to 9), the glare suppression effect was high. In addition, in the case where the protective film was thin (Examples 7 to 9), the glare was particularly suppressed. [Industrial Applicability]

[0232] The present invention can be used in organic electroluminescence display devices. [Explanation of symbols]

[0233] 1A, 1B, 1C…optical laminate, 2…anti-glare layer, 3…anti-glare layer-forming substrate layer, 4…polarizing film, 5…protective film, 6…retardation layer, 7a, 7b, 7c…adhesive layer, 8…ultraviolet absorbing layer (intermediate layer), 9…organic EL display panel, 10…organic EL display device.

Claims

1. An antiglare layer, an antiglare layer-forming substrate layer, a polarizing film, a protective film, and a retardation layer, in this order; a haze measured by combining the protective film, the retardation layer, and a member between the protective film and the retardation layer is 0.3% or more; An optical laminate, wherein the haze measured by combining the antiglare layer and the antiglare layer-forming substrate layer is less than 5%.

2. 2. The optical laminate according to claim 1, wherein the haze measured for the antiglare layer and the antiglare layer-forming substrate layer together is 0.1% or more and 4.0% or less.

3. 2. The optical laminate according to claim 1, wherein the thickness of the substrate layer for forming an antiglare layer is 15 μm to 30 μm.

4. 2. The optical laminate according to claim 1, wherein the protective film has a thickness of 15 μm to 30 μm.

5. 5. The optical laminate according to claim 4, wherein the distance between the surface of the antiglare layer-forming substrate layer facing the polarizing film and the surface of the retardation layer opposite the polarizing film is 70 μm or less.

6. 2. The optical laminate according to claim 1, wherein the haze measured for the protective film, the retardation layer, and a member between the protective film and the retardation layer is 1.3% or less.

7. The optical laminate according to claim 1 , wherein the antiglare layer-forming substrate layer and the polarizing film are directly bonded to each other.

8. an organic electroluminescent display panel; An organic electroluminescent display device comprising: the optical laminate according to any one of claims 1 to 7, which is disposed on the viewing side of the organic electroluminescent display panel.

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