Optical laminate and organic electroluminescent display device provided with same

Abstract

The invention provides an optical laminate and an organic electroluminescent display device provided with the same. Provided is an optical laminate capable of suppressing glare while maintaining satisfactory anti-glare properties. An optical laminate (1A) is provided with an anti-glare layer (2), an anti-glare layer-forming substrate layer (3), a polarizing film (4), a protective film (5), and a phase difference layer (6) in this order. The haze measured together with the protective film (5), the phase difference layer (6) and a member therebetween is 0.3% or more, and the haze measured together with the anti-glare layer (2) and the anti-glare layer-forming substrate layer (3) is less than 5%.

Description

Technical Field

[0001] The present invention relates to an optical layered body and an organic electroluminescent display device including the optical layered body. Background Art

[0002] Organic electroluminescent (OLED) displays typically have a circular polarizing plate attached to the viewing side of the display panel to suppress external light reflection caused by electrodes within the display panel (see, for example, Patent Document 1). This circular polarizing plate is sometimes provided with an anti-glare layer to suppress surface reflection (reflected glare) from the circular polarizing plate itself. This reduces reflected glare on the display surface and improves the visibility of the displayed image.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2023-51543 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] However, while the provision of an anti-glare layer suppresses reflected glare, it can also cause strong glare to be perceived in the color displayed by organic electroluminescent (OLED) displays. Therefore, an object of the present invention is to provide an optical layered body that can maintain excellent anti-glare properties while suppressing glare. Another object is to provide an organic EL display device incorporating such an optical layered body.

[0008] Means for solving problems

[0009] The present invention provides an optical laminate, which comprises an anti-glare layer, a substrate layer for forming the anti-glare layer, a polarizing film, a protective film, and a phase difference layer in this order. The haze obtained by measuring the protective film, the phase difference layer, and a component located between the protective film and the phase difference layer together is 0.3% or more, and the haze obtained by measuring the anti-glare layer and the substrate layer for forming the anti-glare layer together is less than 5%.

[0010] The present inventors have conducted research on the above-mentioned issues and have concluded that the reason why strong glare is perceived in color display when an anti-glare layer is provided in an organic EL display device that is attached to a circularly polarizing plate having a retardation layer is due to the increased haze of the anti-glare layer. Therefore, they have come up with the idea of ​​preventing glare in such organic EL displays by controlling the haze value of the anti-glare layer within an appropriate range.

[0011] The optical layered body of the present invention preferably has at least one of the following characteristics.

[0012] The haze measured together with the anti-glare layer and the anti-glare layer-forming substrate layer is 0.1% or more and 4.0% or less.

[0013] The thickness of the anti-glare layer-forming substrate layer is 15 μm to 30 μm.

[0014] The thickness of the protective film is 15 μm to 30 μm.

[0015] The distance between the surface of the anti-glare layer-forming substrate layer on the polarizing film side and the surface of the retardation layer on the opposite side to the polarizing film side is 70 μm or less.

[0016] The haze measured together with the protective film, the retardation layer, and a member located between the protective film and the retardation layer is 1.3% or less.

[0017] The anti-glare layer-forming substrate layer and the polarizing film are directly bonded to each other.

[0018] The present invention also provides an organic electroluminescent display device including an organic electroluminescent display panel and the optical laminated body disposed on the observation side of the organic electroluminescent display panel.

[0019] Effects of the Invention

[0020] According to the present invention, it is possible to provide an optical layered body that can maintain good anti-glare properties and suppress glare, and to provide an organic electroluminescent display device including the optical layered body. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a cross-sectional view of an optical layered body according to one embodiment of the present invention.

[0022] Figure 2 This is a cross-sectional view of an optical layered body according to another embodiment of the present invention.

[0023] Figure 3 This is a cross-sectional view of an organic electroluminescent display device according to one embodiment of the present invention.

[0024] Figure 4 This is a cross-sectional view of an optical layered body according to another embodiment of the present invention.

[0025] Description of Reference Numerals

[0026] 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 (interlayer), 9...organic EL display panel, 10...organic EL display device. DETAILED DESCRIPTION

[0027] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same or corresponding parts in each figure are denoted by the same reference numerals, and repeated descriptions are omitted.

[0028] like Figure 1 As shown, the optical laminate 1A of this embodiment comprises an anti-glare layer 2, an anti-glare layer forming substrate layer 3, a polarizing film 4, a protective film 5, and a phase difference layer 6 in this order. A first adhesive layer 7a and a second adhesive layer 7b are provided between the phase difference layer 6 and the protective film 5, and on the other side of the phase difference layer 6, respectively. Figure 1 The adhesive layer is omitted in the figure.

[0029] Polarizing film

[0030] Polarizing films are films that exhibit anisotropic light absorption and are typically composed of polarizers or polarizing films in which a dichroic dye is uniaxially oriented. To achieve uniaxial orientation of the dichroic dye, a film (hereinafter referred to as a "polarizer") can be made by uniaxially stretching a polymer such as polyvinyl alcohol (PVA) impregnated with iodine or an organic dichroic dye. This is achieved by anisotropically absorbing light by the dichroic dye encapsulated within the stretched polymer, thereby exhibiting a polarizing function.

[0031] Polarizing film

[0032] Polarizers, which are films obtained by uniaxially stretching a polymer such as a polyvinyl alcohol resin film impregnated with iodine or an organic dichroic dye, can generally be manufactured through the following steps: uniaxially stretching the polyvinyl alcohol resin film; dyeing the polyvinyl alcohol resin film with a dichroic dye such as iodine to adsorb the dichroic dye; treating the polyvinyl alcohol resin film with the adsorbed dichroic dye with a crosslinking agent such as an aqueous boric acid solution; and finally washing the film with water after treatment with the crosslinking agent such as an aqueous boric acid solution. Polarizers may contain a crosslinking agent.

[0033] The thickness of the polarizer is usually 30 μm or less, preferably 18 μm or less, more preferably 15 μm or less, and further preferably 10 μm or less. The thickness is usually 1 μm or more, for example 5 μm or more.

[0034] The uniaxial stretching of the polyvinyl alcohol resin film can be performed before, simultaneously with, or after dyeing with a dichroic dye. When uniaxial stretching is performed after dyeing, it can be performed before or during the boric acid treatment. Of course, uniaxial stretching can also be performed in multiple stages as shown here. Uniaxial stretching can be performed by a method of uniaxially stretching the film in the direction of film transport between rollers with different peripheral speeds, a method of uniaxially stretching the film in the direction of film transport using heated rollers, a method of stretching the film in the width direction using a tenter, etc. In addition, uniaxial stretching can be performed by dry stretching in the air, or by wet stretching in a state where the polyvinyl alcohol resin film is swollen using a solvent such as water. The stretching ratio is generally about 3 to 8 times. Alternatively, an aqueous solution containing polyvinyl alcohol can be applied to the thermoplastic resin film, dried, and then stretched together with the thermoplastic resin film using the above method.

[0035] 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. Specifically, iodine and a dichroic organic dye can be used as the dichroic dye.

[0036] <Phase difference layer>

[0037] [Laminated structure of phase difference layer]

[0038] A retardation layer is a layer that includes a layer that exhibits phase difference. The portion that exhibits phase difference can be a retardation film formed by stretching a thermoplastic resin film, or an optically anisotropic layer formed from a polymer having an aligned polymerizable liquid crystal compound. The following describes an optically anisotropic layer formed from a polymer having an aligned polymerizable liquid crystal compound.

[0039] From the perspectives of achieving thinness and enabling arbitrary design of wavelength dispersion characteristics, it is preferred to coat a composition containing a polymerizable liquid crystal compound (hereinafter also referred to as an "optically anisotropic layer-forming composition") onto a transparent substrate to form an optically anisotropic layer composed of an oriented polymer of the polymerizable liquid crystal compound. The retardation layer-forming composition may further contain a solvent, a photopolymerization initiator, a photosensitizer, a polymerization inhibitor, a leveling agent, an adhesion enhancer, and the like.

[0040] The optical anisotropic layer is usually formed by coating a polymerizable liquid crystal composition on an alignment film formed on a substrate to be described later, and polymerizing the polymerizable liquid crystal compound contained in the above-mentioned polymerizable liquid crystal composition. It should be noted that the optical anisotropic layer can be formed by directly coating a polymerizable liquid crystal composition on a substrate, and polymerizing the polymerizable liquid crystal compound contained in the above-mentioned polymerizable liquid crystal composition. The optical anisotropic layer is usually a film formed by curing the polymerizable liquid crystal compound in an oriented state. In order to produce a phase difference in the observation surface, it is necessary to be a cured film formed by polymerizing the polymerizable group in a state where the polymerizable liquid crystal compound is oriented in a horizontal direction relative to the substrate surface. At this time, when the polymerizable liquid crystal compound is a rod-shaped liquid crystal, it is a positive A plate, and if the polymerizable liquid crystal compound is a disc-shaped liquid crystal, it is a negative A plate.

[0041] To achieve a high degree of protection against external light reflection, an optically anisotropic layer only needs to function as a λ / 4 plate (i.e., a retardation function of π / 2) throughout the entire visible light range. From this perspective, a reverse wavelength dispersion λ / 4 layer, which exhibits minimal retardation variation throughout the visible light range, is preferred.

[0042] The optically anisotropic layer is preferably a combination of two or more optically anisotropic layers having different orientations. For example, the layer may be a combination of an optically anisotropic layer having a λ / 4 plate function and an optically anisotropic layer having a λ / 2 plate function (i.e., a retardation function of π).

[0043] Furthermore, from the perspective of compensating for antireflection properties in oblique directions, it is also preferable to include a layer with anisotropy in the thickness direction (positive C plate). Furthermore, each optically anisotropic layer may be obliquely aligned or cholesterically aligned. Furthermore, when combining a λ / 4 layer with reverse wavelength dispersion and a positive C plate, a UV-absorbing layer may be laminated between them.

[0044] [Reverse wavelength dispersion λ / 4 layer]

[0045] Regarding the λ / 4 function in the entire visible light region, it is preferred that the in-plane retardation R(λ) with respect to light of wavelength λ nm satisfies the optical characteristics expressed by the following formula (1), and it is more preferred that all of the optical characteristics expressed by the following formula (1), the following formula (2), and the following formula (3) be satisfied.

[0046] 100nm<Re(550)<160nm…(1)

[0047] (Where Re(550) represents the in-plane phase difference (in-plane retardation) relative to light with a wavelength of 550 nm.)

[0048] Re(450) / Re(550)≤1.0…(2)

[0049] 1.00≤Re(650) / Re(550)…(3)

[0050] (Wherein, Re(450) represents the in-plane retardation value relative to light with a wavelength of 450 nm, Re(550) represents the in-plane retardation value relative to light with a wavelength of 550 nm, and Re(650) represents the in-plane retardation value relative to light with a wavelength of 650 nm.)

[0051] If the "Re(450) / Re(550)" ratio of the retardation layer exceeds 1.0, light leakage on the short wavelength side of the elliptically polarizing plate having the optically anisotropic layer increases. It is preferably 0.7 or more and 1.0 or less, more preferably 0.80 or more and 0.95 or less, further 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 arbitrarily adjusted by adjusting the mixing ratio of the polymerizable liquid crystal compound, the stacking angle of multiple optically anisotropic layers, and the retardation value.

[0052] The in-plane retardation value of the optically anisotropic layer can be adjusted by adjusting the thickness of the optically anisotropic layer. Since the in-plane retardation value is determined by the following formula (4), to obtain the desired in-plane retardation value (Re(λ)), it is sufficient to adjust Δn(λ) and the film thickness d. The thickness of the optically anisotropic layer can be measured using an interferometer, a laser microscope, or a stylus-type film thickness meter. It should be noted that Δn(λ) depends on the molecular structure of the polymerizable liquid crystal compound described below.

[0053] Re(λ)=d×Δn(λ)…(4)

[0054] (Where Re(λ) represents the in-plane retardation at a wavelength of λ nm, d represents the film thickness, and Δn(λ) represents the birefringence at a wavelength of λ nm.)

[0055] [Optically anisotropic layer-forming composition; polymerizable liquid crystal compound]

[0056] The polymerizable liquid crystal compound contained in the polymerizable liquid crystal composition as the raw material for forming the optically anisotropic layer refers to a liquid crystal compound having a polymerizable group, particularly a photopolymerizable group. As the polymerizable liquid crystal compound, conventionally known polymerizable liquid crystal compounds can be used. A photopolymerizable group refers to a group that can participate in a polymerization reaction through reactive species generated by a photopolymerization initiator, such as active free radicals, acids, etc. As photopolymerizable groups, vinyl, vinyloxy, 1-chlorovinyl, isopropenyl, 4-vinylphenyl, acryloyloxy, methacryloyloxy, oxiranyl, oxetane, etc. can be mentioned. Among them, acryloyloxy, methacryloyloxy, vinyloxy, oxiranyl and oxetane are preferred, and acryloyloxy is more preferred. The liquid crystal can be either a thermotropic liquid crystal or a lyotropic liquid crystal. From the perspective of being able to perform dense film thickness control, a thermotropic liquid crystal is preferred. In addition, as a phase-ordered structure in a thermotropic liquid crystal, it can be a nematic liquid crystal or a smectic liquid crystal. In addition, it can be a rod-shaped liquid crystal or a disc-shaped liquid crystal. The polymerizable liquid crystal compounds can be used alone or in combination of two or more.

[0057] As a polymerizable liquid crystal compound, from the viewpoint of exhibiting reverse wavelength dispersion, a liquid crystal having a mesomorphic structure in a T-type or H-type further having birefringence in a direction perpendicular to the molecular long axis direction is preferred. From the viewpoint of obtaining stronger dispersion, a T-type liquid crystal is more preferred. Specific examples of the structure of the T-type liquid crystal include, for example, a compound represented by the following formula (I).

[0058] [Chemical Formula 1]

[0059]

[0060] In formula (I), Ar represents a divalent aromatic group that 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 single bond, a divalent bonding group such as -CO-O-, or -O-.

[0061] G 1 and G 2 Each independently represents a divalent aromatic group or a divalent alicyclic hydrocarbon group. Here, hydrogen atoms 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 carbon atoms constituting the divalent aromatic group or divalent alicyclic hydrocarbon group may be replaced with an oxygen atom, a sulfur atom, or a nitrogen atom.

[0062] L 1 , L2 、B 1 and B 2 Each is independently a single bond or a divalent linking group.

[0063] k and l each independently represent an integer from 0 to 3 and satisfy the relationship 1≤k+1. Here, when 2≤k+1, B 1 and B 2 , G 1 and G 2 They can be the same as or different from each other.

[0064] E 1 and E 2 Each independently represents an alkanediyl group having 1 to 17 carbon atoms, wherein the hydrogen atoms contained in the alkanediyl group may be substituted by halogen atoms, and the -CH2- contained in the alkanediyl group may be replaced by -O-, -S-, or -COO-. When there are multiple -O-, -S-, or -COO- groups, they are not adjacent to each other.

[0065] 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.

[0066] G 1 and G 2 Each independently preferably is a 1,4-phenylenediyl group which may be substituted with at least one substituent selected from a halogen atom and an alkyl group having 1 to 4 carbon atoms, or a 1,4-cyclohexanediyl group which may be substituted with at least one substituent selected from a halogen atom and an alkyl group having 1 to 4 carbon atoms. More preferably, it is a 1,4-phenylenediyl group substituted with a methyl group, an unsubstituted 1,4-phenylenediyl group, or an unsubstituted 1,4-trans-cyclohexanediyl group. Particularly preferably, it is an unsubstituted 1,4-phenylenediyl group or an unsubstituted 1,4-trans-cyclohexanediyl group.

[0067] In addition, it is preferable that there are multiple G 1 and G 2 At least one of them is a divalent alicyclic hydrocarbon group, and more preferably 1 or L 2 Bonded G 1 and G 2 At least one of them is a divalent alicyclic hydrocarbon group.

[0068] L 1 and L 2 Each of them is independently preferably a single bond, an alkylene group having 1 to 4 carbon atoms, -O-, -S-, -R a1 OR a2 -、-R a3 COOR a4 -、-Ra5 OCOR a6 -、R a7 OC=OOR a8 -、-N=N-、-CR c =CR d -, or -C≡C-. Here, 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 More preferably, each independently represents a single bond, -OR a2-1 -、-CH2-、-CH2CH2-、-COOR a4-1 -, or OCOR a6-1 -. Here, R a2-1 、R a4-1 、R a6-1 Each independently represents a single bond, -CH2-, or -CH2CH2-. 1 and L 2 Each independently is further preferably a single bond, -O-, -CH2CH2-, -COO-, -COOCH2CH2-, or OCO-.

[0069] B 1 and B 2 Each of them is independently preferably a single bond, an alkylene group having 1 to 4 carbon atoms, -O-, -S-, -R a9 OR a10 -、-R a11 COOR a12 -、-R a13 OCOR a14 -, or R a15 OC=OOR a16 -. Here, R a9 ~R a16 Each independently represents a single bond or an alkylene group having 1 to 4 carbon atoms. 1 and B 2 More preferably, each independently represents a single bond, -OR a10-1 -、-CH2-、-CH2CH2-、-COOR a12-1 -, or OCOR a14-1 -. Here, R a10-1 、R a12-1 、R a14-1 Each independently represents a single bond, -CH2-, or -CH2CH2-. 1 and B 2Each independently is further preferably a single bond, -O-, -CH2CH2-, -COO-, -COOCH2CH2-, -OCO-, or OCOCH2CH2-.

[0070] From the viewpoint of exhibiting reverse wavelength dispersion, k and l are preferably in the range of 2≤k+l≤6, preferably k+l=4, and more preferably k=2 and l=2. k=2 and l=2 are preferred because they form a symmetrical structure.

[0071] E 1 and E 2 Each independently of the above, an alkanediyl group having 1 to 17 carbon atoms is preferred, and an alkanediyl group having 4 to 12 carbon atoms is more preferred.

[0072] As P 1 or P 2 The polymerizable group shown in the figure includes epoxy, vinyl, vinyloxy, 1-chlorovinyl, isopropenyl, 4-vinylphenyl, acryloyloxy, methacryloyloxy, oxiranyl and oxetanyl groups. Among them, acryloyloxy, methacryloyloxy, vinyloxy, oxiranyl and oxetanyl groups are preferred, and acryloyloxy is more preferred.

[0073] Ar preferably has at least one selected from an aromatic hydrocarbon ring that may have a substituent, an aromatic heterocycle that may have a substituent, and an electron-withdrawing group. As the aromatic hydrocarbon ring, for example, a benzene ring, a naphthalene ring, an anthracene ring, etc. can be enumerated, preferably a benzene ring, a naphthalene ring. As the aromatic heterocycle, 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, etc. can be enumerated. Wherein, preferably there is a thiazole ring, a benzothiazole ring or a benzofuran ring, further preferably there is a benzothiazolyl group. In addition, when Ar comprises a nitrogen atom, the nitrogen atom preferably has π electrons.

[0074] 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, further preferably 14 or more, and particularly preferably 16 or more. It is preferably 30 or less, more preferably 26 or less, and even more preferably 24 or less.

[0075] Preferred examples of the aromatic group represented by Ar include the following groups.

[0076] [Chemical Formula 2]

[0077]

[0078] In formulas (Ar-1) to (Ar-23), The mark indicates the connection part, Z 0 , Z 1 and Z 2 Each 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.

[0079] Q 1 and Q 2 Each independently represents -CR 2’ R 3’ -、-S-、-NH-、-NR 2’ -、-CO- or O-,R 2’ and R 3’ Each independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.

[0080] J 1 and J 2 Each independently represents a carbon atom or a nitrogen atom.

[0081] Y 1 and Y 2 Each independently represents an aromatic hydrocarbon group or an aromatic heterocyclic group which may be substituted.

[0082] 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 0-6.

[0083] As Y 1 and Y 2 Examples of the aromatic hydrocarbon group in the group include aromatic hydrocarbon groups having 6 to 20 carbon atoms, such as phenyl, naphthyl, anthracenyl, phenanthrenyl, and biphenyl. Phenyl and naphthyl are preferred, and phenyl is more preferred. Examples of the aromatic heterocyclic group include aromatic heterocyclic groups having 4 to 20 carbon atoms, such as furyl, pyrrolyl, thienyl, pyridyl, thiazolyl, and benzothiazolyl, which contain at least one heteroatom such as a nitrogen atom, an oxygen atom, or a sulfur atom. Furyl, thienyl, pyridyl, thiazolyl, and benzothiazolyl are preferred.

[0084] Y 1 and Y 2Each independently may be a polycyclic aromatic hydrocarbon group or a polycyclic aromatic heterocyclic group which may be substituted. A polycyclic aromatic hydrocarbon group refers to a fused polycyclic aromatic hydrocarbon group or a group derived from an aggregate of aromatic rings. A polycyclic aromatic heterocyclic group refers to a fused polycyclic aromatic heterocyclic group or a group derived from an aggregate of aromatic rings.

[0085] Z 0 , Z 1 and Z 2 Each of them is independently preferably a hydrogen atom, a halogen atom, an alkyl group having 1 to 12 carbon atoms, a cyano group, a nitro group, an alkoxy group having 1 to 12 carbon atoms, 0 More preferably, a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, or a cyano group, Z 1 and Z 2 More preferred are a hydrogen atom, a fluorine atom, a chlorine atom, a methyl group, and a cyano group.

[0086] Q 1 and Q 2 Preferred are -NH-, -S-, and -NR 2’ -、-O-,R 2’ A hydrogen atom is preferred, and among them, -S-, -O-, and -NH- are particularly preferred.

[0087] Among formulae (Ar-1) to (Ar-23), formulae (Ar-6) and (Ar-7) are preferred from the viewpoint of molecular stability.

[0088] In formula (Ar-16) ~ (Ar-23), Y 1 The nitrogen atom and Z 0 Together they form an aromatic heterocyclic group. Examples of the aromatic heterocyclic group include those previously described as aromatic heterocyclic rings 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. The aromatic heterocyclic group may have a substituent. In addition, Y 1 The nitrogen atom and Z 0 Together, they represent the aforementioned optionally substituted polycyclic aromatic hydrocarbon group or polycyclic aromatic heterocyclic group, for example, a benzofuran ring, a benzothiazole ring, a benzoxazole ring, and the like.

[0089] Among the polymerizable liquid crystal compounds, compounds having a maximum absorption wavelength of 300 to 400 nm are preferred. When a photopolymerization initiator is included in the polymerizable liquid crystal composition, it is possible to carry out polymerization reaction and gelation of the polymerizable liquid crystal compound during long-term storage. However, if the maximum absorption wavelength of the polymerizable liquid crystal compound is 300 to 400 nm, even if it is exposed to ultraviolet light during storage, it is possible to effectively suppress the generation of reactive species from the photopolymerization initiator and the polymerization reaction and gelation of the polymerizable liquid crystal compound caused by the reactive species. Therefore, it is advantageous in terms of the long-term stability of the polymerizable liquid crystal composition, and can improve the orientation and uniformity of the film thickness of the obtained liquid crystal cured film. It should be noted that the maximum absorption wavelength of the polymerizable liquid crystal compound can be measured using an ultraviolet-visible spectrophotometer in a solvent. The solvent is a solvent that can dissolve the polymerizable liquid crystal compound, and for example, chloroform can be mentioned.

[0090] Relative to 100 parts by mass of the solid content of the polymerizable liquid crystal composition, 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 further preferably 90 to 95 parts by mass. If the content of the polymerizable liquid crystal compound is within the above range, it is advantageous from the viewpoint of the orientation of the obtained liquid crystal cured film. It should be noted that, in this specification, the solid content of the polymerizable liquid crystal composition refers to all components after removing volatile components such as organic solvents from the polymerizable liquid crystal composition.

[0091] [Combination of a positive wavelength dispersion λ / 2 layer and a positive wavelength dispersion λ / 4 layer]

[0092] As one method for achieving antireflection performance, a structure combining a positive wavelength dispersion λ / 2 layer and a positive wavelength dispersion λ / 4 layer is known. For example, this structure can be achieved by combining a layer having the optical characteristics expressed by the following equations (5), (7), and (8) with a layer having the optical characteristics expressed by equations (6), (7), and (8) with a specific slow axis relationship.

[0093] 100nm<Re(550)<160nm…(5)

[0094] 200nm<Re(550)<320nm…(6)

[0095] Re(450) / Re(550)≥1.00…(7)

[0096] 1.00≥Re(650) / Re(550)…(8)

[0097] Examples of methods for combining the above structures include known methods such as those described in Japanese Patent Application Laid-Open No. 2015-163935 and WO 2013 / 137464. From the perspective of viewing angle compensation, it is preferred to use a λ / 2 layer comprising a polymer of a disc-shaped polymerizable liquid crystal compound and a λ / 4 layer comprising a polymer of a rod-shaped polymerizable liquid crystal compound.

[0098] Examples of the disc-shaped polymerizable liquid crystal compound include a compound containing a group represented by formula (W) (hereinafter, sometimes referred to as a polymerizable liquid crystal compound (C)).

[0099] [Chemical Formula 3]

[0100]

[0101] [In formula (W), R 40 The following formulas (W-1) to (W-5) are represented.

[0102] [Chemical Formula 4]

[0103]

[0104] X 40 and Z 40 represents an alkanediyl group having 1 to 12 carbon atoms. The hydrogen atoms contained in the alkanediyl group may be substituted with an alkoxy group having 1 to 5 carbon atoms, and the hydrogen atoms contained in the alkoxy group may be substituted with a halogen atom. Furthermore, the -CH2- group constituting the alkanediyl group may be replaced with -O- or -CO-. Furthermore, m2 is an integer from 1 to 20.

[0105] 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).

[0106] P11-B11-E11-B12-A11-B13-A12-B14-A13-B15-A14-B16-E12-B17-P12…(I)

[0107] P11-B11-E11-B12-A11-B13-A12-B14-A13-B15-A14-F11…(II)

[0108] P11-B11-E11-B12-A11-B13-A12-B14-A13-B15-E12-B17-P12…(III)

[0109] P11-B11-E11-B12-A11-B13-A12-B14-A13-F11…(IV)

[0110] P11-B11-E11-B12-A11-B13-A12-B14-E12-B17-P12…(V)

[0111] P11-B11-E11-B12-A11-B13-A12-F11…(VI)

[0112] 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. 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.

[0113] B11 represents -O-, -S-, -CO-O-, -O-CO-, -O-CO-O-, -CO-NR 16 -、-NR 16 -CO-, -CO-, -CS- or a single bond. R 16 It represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.

[0114] 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-, -C(=O)-NR 16 -、-NR 16 -C(=O)-, -OCH2-, -OCF2-, -CH2O-, -CF2O-, -CH=CH-C(=O)-O-, -OC(=O)-CH=CH- or a single bond.

[0115] E11 represents an alkanediyl group having 1 to 12 carbon atoms, wherein the hydrogen atoms contained in the alkanediyl group may be substituted with an alkoxy group having 1 to 5 carbon atoms, and the hydrogen atoms contained in the alkoxy group may be substituted with a halogen atom. In addition, the -CH2- group constituting the alkanediyl group may be replaced with -O- or -CO-.

[0116] 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 cyclohexane-1,4-diyl or 1,4-phenylene.

[0117] E11 is preferably a linear alkanediyl group having 1 to 12 carbon atoms. -CH2- constituting the alkanediyl group may be substituted with -O-.

[0118] Specifically, there can be mentioned straight-chain 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; -CH2-CH2-O-CH2-CH2-, -CH2-CH2-O-CH2-CH2-O-CH2-CH2- and -CH2-CH2-O-CH2-CH2-O-CH2-CH2-O-CH2-CH2-, etc.

[0119] As B11, -O-, -S-, -CO-O-, and -O-CO- are preferred, and among them, -CO-O- is more preferred.

[0120] As B12 and B13, each independently preferably is -O-, -S-, -C(=O)-, -C(=O)-O-, -OC(=O)-, or -OC(=O)-O-, and among them, -O- or -OC(=O)-O- is more preferable.

[0121] As the polymerizable group represented by P11, a free radical polymerizable group or a cationic polymerizable group is preferred from the perspective of high polymerization reactivity, especially photopolymerization reactivity. From the perspective of easy handling and easy production of the liquid crystal compound itself, the polymerizable group is preferably a group represented by the following formula (P-11) to formula (P-15).

[0122] [Chemical Formula 5]

[0123]

[0124] [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.]

[0125] Specific examples of the groups represented by formula (P-11) to formula (P-15) include groups represented by the following formula (P-16) to formula (P-20).

[0126] [Chemical Formula 6]

[0127]

[0128] P11 is preferably a group represented by formula (P-14) to formula (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.

[0129] 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 hydroxyl group, a hydroxymethyl group, a formyl group, a sulfo group (-SO3H), a carboxyl group, an alkoxycarbonyl group having 1 to 10 carbon atoms, or a halogen atom. The -CH2- group constituting the alkyl group or alkoxy group may be replaced by -O-.

[0130] [Other components]

[0131] In addition to the above-mentioned combination of the positive wavelength dispersion λ / 2 layer and the positive wavelength dispersion λ / 4 layer, there are no special restrictions on the inclined orientation and cholesteric orientation as long as the anti-reflection function is achieved. For example, the well-known structures in WO2021 / 060378, WO2021 / 132616, and WO2021 / 132624 can be cited.

[0132] <Positive C plate>

[0133] The positive C plate is not particularly limited as long as it has anisotropy in the thickness direction. When tilt orientation or cholesteric orientation is not performed, it has the optical properties represented by formula (9).

[0134] nx≈ny<nz …(9)

[0135] The in-plane retardation value Re(550) of a positive C plate at a wavelength of 550 nm is typically in the range of 0 to 10 nm, preferably in the range of 0 to 5 nm. Furthermore, the thickness-direction retardation value Rth(550) at a wavelength of 550 nm is typically in the range of -170 nm to -10 nm, preferably -150 nm to -20 nm, and more preferably -100 nm to -40 nm. When the thickness-direction retardation value is within this range, the anti-reflection properties from oblique directions can be further improved.

[0136] The positive C plate is preferably a coating layer formed by polymerizing one or more polymerizable liquid crystal compounds, more preferably a rod-shaped polymerizable liquid crystal compound.

[0137] As the rod-shaped polymerizable liquid crystal, the compounds represented by the above formulae (I) to (VI) can be used.

[0138] The thickness of each optically anisotropic layer affects the internal haze described below. From this perspective, the thickness of each optically anisotropic layer is preferably 1 μm to 5 μm, more preferably 2.5 μm to 3.0 μm. In the case of a stretched film, the thickness is generally 300 μm or less, preferably 5 μm to 100 μm, 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.

[0139] When the optically anisotropic layer is a coating layer, the thickness of the entire retardation layer is preferably 0.5 μm to 15 μm, more preferably 1 μm to 10 μm.

[0140] [Method for forming a phase difference layer]

[0141] As a method for forming a phase difference layer, from the viewpoint of thinning and being able to arbitrarily design wavelength dispersion characteristics, an alignment film is formed on a substrate, and a phase difference layer forming composition comprising a polymerizable liquid crystal compound is applied on the alignment film, and the polymerizable liquid crystal compound is polymerized to form. It should be noted that the phase difference layer can also be formed by directly applying a phase difference layer forming composition comprising a polymerizable liquid crystal compound on a substrate without forming an alignment film and polymerizing the polymerizable liquid crystal compound. The phase difference layer forming composition may include a solvent, a photopolymerization initiator, a photosensitizer, an inhibitor, a leveling agent, and an adhesion improver.

[0142] (Composition for forming a phase difference layer; Polymerizable liquid crystal compound)

[0143] The polymerizable liquid crystal compound contained in the retardation layer-forming composition is a liquid crystal compound having a polymerizable group, particularly a photopolymerizable group. Conventionally known polymerizable liquid crystal compounds can be used as such a polymerizable liquid crystal compound. A photopolymerizable group is a group that can participate in a polymerization reaction via reactive species generated by a photopolymerization initiator, such as active free radicals or acids.

[0144] Relative to 100 parts by mass of the solid content of the polymerizable liquid crystal composition, the content of the polymerizable liquid crystal compound in the phase difference layer forming composition is, for example, 70 to 99.5 parts by mass, preferably 80 to 99 parts by mass, more preferably 85 to 98 parts by mass, and further preferably 90 to 95 parts by mass. If the content of the polymerizable liquid crystal compound is within the above range, it is advantageous from the viewpoint of the orientation of the obtained liquid crystal cured film. It should be noted that, in this specification, the solid content of the polymerizable liquid crystal composition refers to all components after removing volatile components such as organic solvents from the polymerizable liquid crystal composition.

[0145] (Base material)

[0146] The substrate is a support for forming the phase difference layer and can be subsequently bonded to the polarizing film 4 to serve as the protective film 5 for protecting the polarizing film 4 .

[0147] Examples of the substrate include film substrates. From the perspective of continuous production, long roll films are more preferred. Examples of the resin constituting the film substrate include polyolefins such as polyethylene, polypropylene, and norbornene polymers; cyclic olefin resins; polyvinyl alcohol; polyethylene terephthalate; polymethacrylates; polyacrylates; cellulose esters such as triacetyl cellulose, diacetyl cellulose, and cellulose acetate propionate; polyethylene naphthalate; polycarbonate; polysulfone; polyethersulfone; polyetherketone; plastics such as polyphenylene sulfide and polyphenylene ether. Among these, from the perspective of transparency when used in optical film applications, a film substrate selected from any one of triacetyl cellulose, cyclic olefin resins, polymethacrylates, and polyethylene terephthalate is more preferred.

[0148] The substrate thickness is preferably thin enough to allow practical handling. However, if it is too thin, strength tends to decrease and processability tends to deteriorate. The substrate thickness is generally 5 μm to 200 μm, preferably 10 μm to 100 μm, and more preferably 15 to 50 μm. Furthermore, by peeling the substrate and transferring the polarizing film or optically anisotropic layer, further thinning can be achieved.

[0149] (Oriented film)

[0150] The alignment film is a film formed on a substrate and has an alignment regulating force for aligning the polymerizable liquid crystal compound coated on the alignment film in a desired direction.

[0151] The alignment film facilitates the liquid crystal orientation of the polymerizable liquid crystal compound. The state of liquid crystal orientation, such as horizontal alignment, vertical alignment, mixed alignment, and tilted alignment, varies depending on the properties of the alignment film and the polymerizable liquid crystal compound, and their combination can be selected arbitrarily. For example, if the alignment film is a material that exhibits horizontal alignment as an alignment limiting force, the polymerizable liquid crystal compound can form a horizontal alignment or a mixed alignment. If it is a material that exhibits vertical alignment, the polymerizable liquid crystal compound can form a vertical alignment or a tilted alignment. Expressions such as horizontal and vertical indicate the direction of the optical axis of the oriented polymerizable liquid crystal compound when the plane of the optically anisotropic layer is used as a reference. For example, vertical alignment refers to having the optical axis of the oriented polymerizable liquid crystal compound in a direction perpendicular to the plane of the optically anisotropic layer. The vertical mentioned here refers to 90°±20° relative to the plane of the optically anisotropic layer.

[0152] Regarding the orientation restraining force, when the alignment film is formed of an aligning polymer, it can be arbitrarily adjusted by the surface state and rubbing conditions. When it is formed of a photoaligning polymer, it can be arbitrarily adjusted by polarized light irradiation conditions, etc. In addition, the liquid crystal orientation can also be controlled by selecting the physical properties such as the surface tension and liquid crystallinity of the polymerizable liquid crystal compound.

[0153] 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 heat-resistant during the heat treatment for solvent removal and liquid crystal alignment. Examples of alignment films include alignment films containing an aligning polymer, photoalignment films, groove alignment films, and stretched films stretched in the alignment direction. When applied to a long roll film, photoalignment films are preferred because they allow for easy control of the alignment direction.

[0154] 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.

[0155] As the orientation polymer used in the rubbed orientation film, polyamides, gelatins, polyimides with imide bonds in the molecule and polyamic acid, polyvinyl alcohol, alkyl-modified polyvinyl alcohol, polyacrylamide, polyoxazole, polyethyleneimine, polystyrene, polyvinyl pyrrolidone, polyacrylic acid and polyacrylates etc. can be enumerated. Among them, polyvinyl alcohol is preferred. These orientation polymers can be used alone or in combination of two or more.

[0156] As a method of rubbing, there is mentioned a method of bringing a film of an oriented polymer formed on the surface of a substrate by applying an oriented polymer composition to the substrate and annealing the film into contact with a rotating rubbing roller wound with a rubbing cloth.

[0157] The photo-alignment film comprises a polymer, oligomer, or monomer having a photoreactive group. The photo-alignment film obtains an alignment restraining force by irradiating polarized light. From the perspective of being able to arbitrarily control the direction of the alignment restraining force by selecting the polarization direction of the irradiated polarized light, a photo-alignment film is more preferred.

[0158] A photoreactive group is a group that exhibits liquid crystal alignment properties upon exposure to light. Specifically, it is a group that undergoes photoreactions that induce molecular alignment upon exposure to light, such as isomerization, dimerization, photocrosslinking, or photodecomposition reactions, which are the source of the liquid crystal alignment properties. Among these photoreactive groups, those that exhibit dimerization or photocrosslinking reactions are preferred due to their excellent alignment properties. Photoreactive groups capable of these reactions are preferably those having an unsaturated bond, particularly a double bond, and more preferably groups having at least one selected from 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).

[0159] As photoreactive groups having C=C bonds, for example, vinyl, polyenyl, stilbene, stilbazolyl, stilbazolinium, chalcone and cinnamoyl groups can be mentioned. From the viewpoint of easy control of reactivity and the viewpoint of exhibiting orientation restriction force during photo-orientation, chalcone and cinnamoyl groups are preferred. As photoreactive groups having C=N bonds, groups having structures such as aromatic Schiff bases and aromatic hydrazones can be mentioned. As photoreactive groups having N=N bonds, groups with azobenzene as the basic structure can be mentioned, such as azobenzene, azonaphthyl, aromatic heterocyclic azo, disazo and formazan. As photoreactive groups having C=O bonds, benzophenone, coumarin, anthraquinone and maleimide groups can be mentioned. These groups may have substituents such as alkyl, alkoxy, aryl, allyloxy, cyano, alkoxycarbonyl, hydroxyl, sulfonic acid and haloalkyl groups.

[0160] Polarized light irradiation can be performed directly from the film surface or from the substrate side, where the polarized light is transmitted. The polarized light is preferably substantially parallel. The wavelength of the polarized light used is preferably polarized light in a wavelength range where the photoreactive groups of the polymer or monomer containing the photoreactive group can absorb light energy. Specifically, ultraviolet light (UV) 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 due to their high emission intensity of ultraviolet light with a wavelength of 313 nm. Polarized light irradiation can be achieved by passing the light from these light sources through an appropriate polarizer. Examples of such polarizers include polarizing filters, polarizing prisms such as Glan-Thomson prisms and Glan-Taylor prisms, and wire-grid polarizers.

[0161] <Protective film>

[0162] 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 can be directly laminated to each other. Here, "direct lamination" includes lamination to the polarizing element using the self-adhesive properties of the protective film, as well as lamination to the polarizing element via an adhesive layer or pressure-sensitive adhesive layer. To improve adhesion to the polarizing element, the protective film may be surface treated (e.g., corona treatment) or may be formed with a thin layer such as a primer layer (also known as an adhesion-enhancing layer). The protective film 5 is laminated to one or both sides of the polarizing film 4.

[0163] As the protective film 5, for example, a resin film having excellent transparency, mechanical strength, thermal stability, moisture barrier properties, isotropy, and stretchability can be used. The resin film can be a thermoplastic resin film. Specific examples of such resins include: cellulose resins such as triacetylcellulose; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; polyethersulfone resins; polysulfone resins; polycarbonate resins; polyamide resins such as nylon and aromatic polyamide; polyimide resins; polyolefin resins such as polyethylene, polypropylene, and ethylene-propylene copolymers; cyclic polyolefin resins having ring and norbornene structures (also known as norbornene resins); (meth)acrylic resins such as polymethyl methacrylate; polyarylate resins; polystyrene resins; polyvinyl alcohol resins; and mixtures thereof. Protective films made of such materials are readily available on the market. Other examples include (meth)acrylic, urethane, (meth)acrylic urethane, epoxy, silicone, and other thermosetting resins and UV curing resins. In this specification, (meth)acrylic refers to either acrylic or methacrylic.

[0164] The thickness of the protective film 5 is preferably 5 μm to 60 μm, more preferably 10 μm to 50 μm, further preferably 15 μm to 40 μm, and particularly preferably 20 μm to 30 μm.

[0165] The haze (hereinafter referred to as internal haze) obtained by measuring the protective film 5, the phase difference layer 6, and all the components located between the protective film 5 and the phase difference layer 6 is 0.3% or more. The internal haze is preferably 1.3% or less, more preferably 0.4% or more and 1.1% or less, further preferably 0.5% or more and 1.0% or less, and further preferably 0.6% or more and 0.9% or less. In addition, the upper limit is also preferably 0.8%. If the internal haze is small, the anti-glare property is low, and if the internal haze is high, the clarity in the organic EL display device becomes low. Here, the method for measuring the internal haze is based on the method described in the embodiment.

[0166] The absorptivity of the protective film 5 with respect to light having a wavelength of 380 nm is preferably 80% to 99%, and more preferably 90% to 95%.

[0167] <Anti-glare layer>

[0168] The anti-glare layer 2 is a layer used to suppress surface reflection in the optical laminate 1A. Preferred constituent materials are those that cure by heat or light. Examples include organic materials such as silicone, melamine, epoxy, (meth)acrylic, and urethane (meth)acrylate-based materials, and inorganic materials such as silica. Among these, urethane (meth)acrylate-based or multifunctional (meth)acrylate-based hard coating materials are preferred due to their excellent adhesion to the anti-glare layer-forming substrate layer 3 and productivity. Pentaerythritol tetraacrylate is also preferred. It should be noted that the term "(meth)acrylate" refers to either an acrylate or a methacrylate.

[0169] The anti-glare layer 2 can also contain various fillers according to expectation, in addition to the purpose of realizing anti-glare property improvement, for the purpose of realizing adjustment of refractive index, improvement of bending elastic modulus, stabilization of volume shrinkage, or even improvement of heat resistance and antistatic property. In addition, it can also contain additives such as antioxidants, ultraviolet light absorbers, light stabilizers, antistatic agents, leveling agents, and defoamers. By adjusting these, the anti-glare layer can be provided with UV absorption function (preventing polaroid deterioration), anti-glare property improvement, and hard coating function (ensuring sufficient scratch resistance). Being able to realize these effects with an anti-glare layer is a contribution to filmization, etc.

[0170] The anti-glare properties of the anti-glare layer 2 are achieved by having a fine surface irregularity or by containing organic or inorganic particles or the aforementioned additives. An anti-glare layer having a fine surface irregularity can be formed by 1) forming a coating film containing particles on the anti-glare layer-forming substrate layer and providing irregularities based on the particles; or 2) forming a coating film containing or without particles on the anti-glare layer-forming substrate layer and then transferring the irregularities by pressing the film against a mold (such as a roller) with the irregularities imparted to the surface (also known as embossing). Alternatively, an anti-glare layer containing organic or inorganic particles and the aforementioned additives can be formed by preparing an anti-glare layer-forming composition, applying the composition to the anti-glare layer-forming substrate layer, and then drying the composition.

[0171] The thickness of the anti-glare layer may be 1 μm to 20 μm, or 2 μm to 10 μm.

[0172] <Anti-glare layer-forming base layer>

[0173] The anti-glare layer-forming base material layer 3 is a base material for forming the anti-glare layer 2. Furthermore, the anti-glare layer-forming base material layer 3 also functions as a protective film for protecting the polarizing film 4.

[0174] The constituent material of the anti-glare layer-forming base material layer 3 may be the same as that of the aforementioned "protective film 5." The thickness of the anti-glare layer-forming base material layer 3 may be 10 μm to 60 μm, or 15 μm to 30 μm.

[0175] The distance between the surface of the anti-glare layer-forming substrate layer 3 on the polarizing film 4 side and the surface of the phase difference layer 6 on the side opposite to the polarizing film 4 side is preferably 70 μm or less, more preferably 60 μm or less. This shortens the optical path of light emitted by the organic EL element until it reaches the anti-glare layer, reducing the range of light diffusion. Therefore, it is easier to maintain the clarity of the displayed image. To shorten this distance, the anti-glare layer-forming substrate layer 3 is preferably directly bonded to the polarizing film 4.

[0176] In this embodiment, the haze (external haze) measured together for the anti-glare layer 2 and the anti-glare layer-forming substrate layer 3 is less than 5%. To maintain good anti-glare properties and suppress glare, the 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%. Alternatively, the haze (external haze) may be 0.5% to 2.0%. The haze measurement method herein is based on the method described in the Examples.

[0177] In this embodiment, the transmittance of light having a wavelength of 380 nm, measured together with the anti-glare layer 2 and the anti-glare layer-forming substrate layer 3, is preferably 1% to 20%, more preferably 10% or less, and particularly preferably 5% or less. Within this range, the effect of preventing degradation of the polarizing film, etc., is high.

[0178] In addition, in this specification, the anti-glare layer 2 and the anti-glare layer-forming base material layer 3 may be collectively referred to as an "anti-glare film."

[0179] <Adhesive layer>

[0180] As the adhesive composition forming the first adhesive layer 7a and the second adhesive layer 7b, any conventionally known adhesive composition having excellent optical transparency can be used without particular limitation. For example, an adhesive composition having a base polymer such as an acrylic resin, a urethane resin, a silicone resin, or a polyvinyl ether resin can be used. Alternatively, an active energy ray-curable adhesive composition or a thermosetting adhesive composition can be used. Among these, an adhesive composition having an acrylic resin as a base polymer, which exhibits excellent transparency, adhesive strength, removability, weather resistance, and heat resistance, is particularly suitable.

[0181] 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.

[0182] <Fitting>

[0183] A circularly polarizing plate can be obtained by laminating an anti-glare film, a polarizing film, and a retardation layer. This lamination can be performed simultaneously on three sheets using an adhesive or pressure-sensitive adhesive layer, or two sheets at a time. If the anti-glare film, polarizing film, and retardation layer are all long strips, they can be laminated using nip rollers while being transported.

[0184] When laminating the polarizing film and the phase difference layer, the polarizing film or the phase difference layer may be provided with a protective film in advance. When the polarizing film is provided with a protective film in advance to constitute a polarizing plate, the polarizing film and the protective film are laminated with an adhesive, and the phase difference layer is laminated with an adhesive or a pressure-sensitive adhesive layer on the protective film side (see Figure 1 When the phase difference layer is provided with a protective film in advance, the polarizing film is attached to the protective film side with the aid of an adhesive (refer to Figure 2 In this case, the adhesive layer 7a is unnecessary, and the substrate serving as the support of the optically anisotropic layer functions as a protective film for the polarizing plate, which reduces the number of production steps.

[0185] Any appropriate adhesive can be used as the adhesive constituting the adhesive layer, and examples of the adhesive that can be used include water-based adhesives and active energy ray-curable adhesives.

[0186] The thickness of the adhesive during application can be set to any appropriate value. For example, it can be set so that an adhesive layer having the desired thickness is obtained after curing or heating (drying). The thickness of the adhesive layer is preferably 0.01 μm to 7 μm, more preferably 0.01 μm to 5 μm, even more preferably 0.01 μm to 2 μm, and most preferably 0.01 μm to 1 μm.

[0187] Examples of the water-based adhesive include a polyvinyl alcohol-based resin aqueous solution and a water-based two-component urethane emulsion adhesive.

[0188] 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 rays, visible light, electron beams, and X-rays, and is preferably an ultraviolet-curable adhesive.

[0189] Effects

[0190] Conventional circularly polarizing plates exhibit increased haze due to their anti-glare properties, resulting in a strong sense of glare in color displays. In contrast, in the optical laminate of this embodiment, the haze measured for both the anti-glare layer and the anti-glare layer-forming substrate is a moderately suppressed value of less than 5%. Therefore, when used in an organic EL display device, glare can be suppressed while maintaining anti-glare properties.

[0191] Organic electroluminescent display devices

[0192] The optical laminate 1A can be applied to image display devices such as mobile devices such as smartphones and tablets, televisions, digital photo frames, electronic signs, measuring instruments or measuring instruments, office equipment, medical equipment, and electronic computing equipment, especially organic electroluminescent (organic EL) display devices. Figure 3 As shown, by bonding the optical laminate 1A to the observation side of the organic EL display panel 9 , the organic EL display device 10 can be constructed.

[0193] The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments. For example, in the above embodiment, an example is shown in which the anti-glare layer forming substrate layer 3 and the polarizing film 4 are directly bonded to each other, but another layer (interlayer 8) may be interposed between the anti-glare layer forming substrate layer and the polarizing film. The interlayer 8 may be, for example, Figure 4 As shown in the optical laminate 1C, the ultraviolet absorbing layer 8 is provided. In this case, the third pressure-sensitive adhesive layer 7 c is used to bond the anti-glare layer-forming substrate layer 3 and the ultraviolet absorbing layer 8 together.

[0194] In addition, a coating layer (surface treatment layer) other than the anti-glare layer may also be provided on the surface of the optical laminate. Specific examples of the surface treatment layer include a hard coat layer, an anti-reflection layer, an antistatic layer, and an antifouling layer. The method for forming the surface treatment layer is not particularly limited, and known methods may be used. The hard coat layer may be formed on one side of the protective film or on both sides. By providing a hard coat layer, a protective film with improved hardness and scratch resistance can be produced. 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, epoxy resins, and the like. To increase strength, the hard coat layer may contain additives. The additives are not particularly limited, and examples include inorganic microparticles, organic microparticles, or mixtures thereof.

[0195] Example

[0196] Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. It should be noted that the present invention is not limited to the following Examples. In addition, unless otherwise specified, "%" and "parts" refer to mass % and mass parts, respectively.

[0197] <Production of Polarizing Film (P)>

[0198] A 30μm-thick polyvinyl alcohol film with an average degree of polymerization of approximately 2400 and a saponification degree of 99.9 mol% or greater was immersed in 30°C pure water and then immersed in a 30°C aqueous solution containing iodine, potassium iodide, and water in a mass ratio of 0.02:2:100 for iodine dyeing (hereinafter referred to as the iodine dyeing step). The polyvinyl alcohol film that had undergone the iodine dyeing step was then immersed in a 56.5°C aqueous solution containing potassium iodide, boric acid, and water in a mass ratio of 12:5:100 for boric acid treatment (hereinafter referred to as the boric acid treatment step). The boric acid-treated polyvinyl alcohol film was rinsed with 8°C pure water and then dried at 65°C to obtain a polarizing film (P) with iodine adsorption and orientation on the polyvinyl alcohol. Stretching was performed during the iodine dyeing and boric acid treatment steps. The total stretch ratio during this stretching was 5.3 times. The thickness after stretching was 12μm.

[0199] <Preparation of Water-Based Adhesive (A)>

[0200] A polyvinyl alcohol aqueous 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. A water-soluble polyamide epoxy resin ("Sumirez Resin 650(30)" manufactured by Taoka Chemical Industry Co., Ltd., solid content concentration 30% by mass) was mixed with the obtained aqueous solution at a ratio of 1.5 parts by mass per 100 parts by mass of water to obtain a water-based adhesive (A).

[0201] Adhesive layer (AD)

[0202] [Preparation of Adhesive Layer (AD1)]

[0203] 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 was placed in a reaction vessel equipped with a condenser, a nitrogen inlet, a thermometer, and a stirrer. While replacing the air in the vessel with nitrogen to remove oxygen, the internal temperature was raised to 55°C. Then, a solution of 0.12 parts azobisisobutyronitrile (polymerization initiator) dissolved in 10 parts ethyl acetate was added. After adding the polymerization initiator, the temperature was maintained at this level for one hour. Ethyl acetate was then continuously added to the reaction vessel at a rate of 17.3 parts / hr 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 temperature was maintained at this level for 6 hours from the start of ethyl acetate addition. Finally, ethyl acetate was added to adjust the (meth)acrylic resin concentration to 20% by mass, thereby 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 using a GPC apparatus equipped with two TSKgel GMHHR-H(S) columns connected in series, using tetrahydrofuran as the eluent, at a sample concentration of 2 mg / mL, a sample introduction volume of 100 μL, a temperature of 40°C, and a flow rate of 1 mL / min, using standard polystyrene conversion.

[0204] To 80 parts of the solid content of this acrylic resin solution, 20 parts (solid content) of a difunctional acrylate (available from Shin-Nakamura Chemical Co., Ltd.; product number "A-DOG"), 2.5 parts (based on the active ingredient) of a crosslinker (trade name "Coronate L" manufactured by Tosoh Corporation (an ethyl acetate solution of a trimethylolpropane adduct of toluene diisocyanate (solid content concentration 75% by mass)), 1.5 parts of a photopolymerization initiator (trade name "Irgacure 500" manufactured by Ciba Specialty Chemicals), and 0.3 parts of a silane coupling agent (trade name "KBM-403" manufactured by Shin-Etsu Chemical Co., Ltd.) were added. Ethyl acetate was further added to achieve a solid content concentration of 13% to obtain a pressure-sensitive adhesive composition. Note that "A-DOG" is a diacrylate of an acetal compound of hydroxypivalaldehyde and trimethylolpropane, and has the following structure.

[0205] [Chemical Formula 7]

[0206]

[0207] The adhesive composition prepared above was applied to the release-treated surface of a separator made of polyethylene terephthalate film (PLZ-383030, available from Lintec Corporation) using an applicator to a thickness of 5 μm after drying. The composition was then dried at 100°C for 1 minute to produce an adhesive layer (AD1) laminated to the separator. Next, the surface of the adhesive layer (AD1) opposite the separator was bonded to the release-treated surface of a separator made of polyethylene terephthalate film (PLR-381031, available from Lintec Corporation). The film was then irradiated with ultraviolet light under the following conditions to produce an adhesive layer (AD1) protected on both sides by the separators.

[0208] (UV irradiation conditions)

[0209] ·Using Fusion UV lamp system (Fusion UV Systems) H bulb

[0210] Cumulative light intensity 250mJ / cm 2

[0211] [Preparation of Adhesive Layer (AD2)]

[0212] A mixed solution of 81.8 parts ethyl acetate, 98.0 parts butyl acrylate, and 2.0 parts acrylic acid was placed in a reaction vessel equipped with a condenser, nitrogen inlet, thermometer, and stirrer. While replacing the air in the vessel with nitrogen to remove oxygen, the internal temperature was raised to 55°C. Then, the entire amount of a solution of 0.14 parts azobisisobutyronitrile (polymerization initiator) dissolved in 10 parts ethyl acetate was added. After adding the polymerization initiator, the temperature was maintained at this level for one hour. Ethyl acetate was then continuously added to the reaction vessel at a rate of 17.3 parts / hr while maintaining the internal temperature at 54-56°C. Ethyl acetate addition was stopped when the (meth)acrylic resin concentration reached 35% by mass. The temperature was then maintained at this level until 12 hours had passed since the start of ethyl acetate addition. Finally, ethyl acetate was added to adjust the (meth)acrylic resin concentration to 20% by mass, thereby 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. It should be noted that Mw and Mn were measured as follows: two "TSKgel GMHHR-H(S)" columns manufactured by Tosoh Corporation were connected in series in a GPC apparatus, tetrahydrofuran was used as the eluent, and the measurement was performed based on standard polystyrene conversion under the conditions of a sample concentration of 2 mg / mL, a sample introduction volume of 100 μL, a temperature of 40°C, and a flow rate of 1 mL / min.

[0213] To 80 parts of the solid content of the acrylic resin solution, 20 parts (solid content) of a difunctional acrylate (available from Shin-Nakamura Chemical Co., Ltd.; product number "A-DOG"), 3.0 parts (based on the active ingredient) of a crosslinker (manufactured by Tosoh Corporation; trade name "Coronate L" (an ethyl acetate solution of a trimethylolpropane adduct of toluene diisocyanate (solid content concentration 75% by mass)), 1.5 parts of a photopolymerization initiator (manufactured by Ciba Specialty Chemicals; trade name "Irgacure 500"), and 0.5 parts of a silane coupling agent (manufactured by Shin-Etsu Chemical Co., Ltd.; trade name "KBM-403") were added. Ethyl acetate was further added to give a solid content concentration of 13%, thereby obtaining an adhesive composition.

[0214] The adhesive composition prepared above was applied to the release-treated surface of a separator made of polyethylene terephthalate film (PLR-382150, available from Lintec Corporation) using an applicator to a thickness of 25 μm after drying. The composition was then dried at 100°C for 1 minute to obtain an adhesive layer (AD2) laminated to the separator. Next, the surface of the adhesive layer opposite the separator was bonded to the release-treated surface of a separator made of polyethylene terephthalate film (PLZ-381130, available from Lintec Corporation). UV light was then applied under the following conditions to obtain an adhesive layer (AD2) protected on both sides by the separators.

[0215] (UV irradiation conditions)

[0216] ·Use Fusion UV lamp system (Fusion UV Systems) D bulb

[0217] Cumulative light intensity 1500mJ / cm 2

[0218] <Production of Retardation Layer (R1)>

[0219] [Fabrication of Liquid Crystal Retardation Layer (R1-1)]

[0220] (Preparation of Photo-Alignment Film-Forming Composition (O1-1))

[0221] A photo-alignment material having the following chemical structure (weight-average molecular weight: 50,000, m:n = 50:50) was prepared according to the method described in Japanese Patent Application Laid-Open No. 2021-196514. Two parts of the photo-alignment material and 98 parts of cyclopentanone (solvent) were mixed and stirred at 80°C for 1 hour to prepare a photo-alignment film-forming composition (O1-1).

[0222] Polymer as a photo-alignment material: a compound represented by the following formula

[0223] [Chemical Formula 8]

[0224]

[0225] (Preparation of polymerizable liquid crystal compounds)

[0226] A polymerizable liquid crystal compound (C1-1) and a 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.

[0227] Polymerizable liquid crystal compound (C1-1): a compound represented by the following formula

[0228] [Chemical Formula 9]

[0229]

[0230] Polymerizable liquid crystal compound (C1-2): a compound represented by the following formula

[0231] [Chemical Formula 10]

[0232]

[0233] 1 mg of the polymerizable liquid crystal compound (C1-1) was dissolved in 10 mL of chloroform to obtain a solution. The resulting solution was placed in a cuvette with a 1 cm optical path length as a measurement sample. The sample was placed in an ultraviolet-visible spectrophotometer ("UV-2450" manufactured by Shimadzu Corporation) and the absorption spectrum was measured. The wavelength at which the maximum absorbance was measured from the resulting absorption spectrum revealed a maximum absorption wavelength λmax of 356 nm within the wavelength range of 300 to 400 nm.

[0234] (Preparation of Phase Difference Layer-Forming Composition (Y1-1))

[0235] A polymerizable liquid crystal compound (C1-1) and a polymerizable liquid crystal compound (C1-2) were mixed at a mass ratio of 90:10 to obtain a mixture. To 100 parts of the resulting 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 Co., Ltd.), were added. Furthermore, N-methyl-2-pyrrolidone (NMP) was added to achieve a solids concentration of 13%. The mixture was stirred at 80°C for 1 hour to prepare a retardation layer-forming composition (Y1-1).

[0236] (Fabrication of Liquid Crystal Retardation Layer (R1-1))

[0237] The photo-alignment film-forming composition (O1-1) was applied to a substrate layer (B1-1) composed of a biaxially oriented polyethylene terephthalate (PET) film (Diafoil, manufactured by Mitsubishi Plastics Co., Ltd.) using a bar coater. The resulting coated film was dried at 120°C for 2 minutes and then cooled to room temperature to form a dry film. Subsequently, the film was irradiated with 100 mJ of polarized ultraviolet light (at 313 nm) using a UV irradiation device (SPOTCURE SP-9; manufactured by USHIO Electric Co., Ltd.) to produce a photo-alignment film (D1-1). The thickness of the photo-alignment film (D1-1), measured using an ellipsometer M-220 manufactured by JASCO Corporation, was 100 nm.

[0238] The retardation layer-forming composition (Y1-1) was applied to the resulting photo-alignment film (D1-1) using a bar coater to form a coating film. The coating film was dried by heating at 120°C for 2 minutes and then cooled to room temperature to obtain a dry film. Next, the dry film was irradiated with a high-pressure mercury lamp ("Unicure VB-15201BY-A" manufactured by USHIO Electric Co., Ltd.) under a nitrogen atmosphere at an exposure dose of 500 mJ / cm 2 The polymerizable liquid crystal compound was cured by ultraviolet light (365 nm) to form an optically anisotropic layer (E1-1) aligned horizontally with respect to the substrate plane. This resulted in a liquid crystal retardation layer (R1-1) comprising a substrate layer (B1-1), a photo-alignment film (D1-1), and an optically anisotropic layer (E1-1). The thickness of the optically anisotropic layer (E1-1), measured using an Olympus laser microscope (LEXT OLS4100), was 2.0 μm.

[0239] The optically anisotropic layer (E1-1) side of the liquid crystal retardation layer (R1-1) was corona treated and bonded to glass using a 25μm pressure-sensitive adhesive manufactured by Lintec. The PET film was peeled off and removed. The in-plane retardation value was measured using a KOBRA-WR manufactured by Oji Scientific Instruments Co., Ltd. The in-plane retardation values ​​for light with wavelengths of 450nm, 550nm, and 650nm were calculated using the Cauchy dispersion equation derived from the in-plane retardation measurements for light with wavelengths of 448.2nm, 498.6nm, 548.4nm, 587.3nm, 628.7nm, and 748.6nm.

[0240] As a result, the in-plane retardation values ​​are Re(450)=122 nm, Re(550)=140 nm, and Re(650)=144 nm. The relationship between the in-plane retardation values ​​at each wavelength is as follows.

[0241] Re(450) / Re(550)=0.87

[0242] Re(650) / Re(550)=1.03

[0243] (In the above, Re(450) represents the in-plane retardation value relative to light with a wavelength of 450 nm, Re(550) represents the in-plane retardation value relative to light with a wavelength of 550 nm, and Re(650) represents the in-plane retardation value relative to light with a wavelength of 650 nm.)

[0244] [Fabrication of Liquid Crystal Retardation Layer (R1-2)]

[0245] 100 parts of a polymerizable liquid crystal compound (C1-3) (Paliocolor LC242, manufactured by BASF Japan) having the following chemical structure, 0.1 part of a leveling agent "BYK-361N" (manufactured by BYK-Chemie), and 2.5 parts of a photopolymerization initiator, "Omnirad 907" (manufactured by IGM Resin BV), were mixed. 400 parts of propylene glycol 1-monomethyl ether-2-acetate (PGME) were also added, and the mixture was stirred at 80°C for 1 hour to prepare a retardation layer-forming composition (Y1-2).

[0246] Polymerizable liquid crystal compound (C1-3):

[0247] [Chemical Formula 11]

[0248]

[0249] [Preparation of Photo-Alignment Film-Forming Composition (O1-2)]

[0250] 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 aligning polymer, so that the solid content became 1%, to obtain a composition for forming a photoalignment film (O1-2).

[0251] [Production of phase difference film (1)]

[0252] A corona treatment device (AGF-B10; manufactured by Kasuga Electric Co., Ltd.) was used to apply corona treatment to one side of a substrate layer (B1-2) composed of a cycloolefin polymer (COP) film (ZEON Co., Ltd., ZF14) and a composition for forming a photo-alignment film (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, a composition for forming a phase difference layer (Y1-2) was applied to the vertical alignment film (D1-2) using a bar coater and dried at 90°C for 1 minute. The dried film was then irradiated with an exposure dose of 1000 mJ / cm2 using a high-pressure mercury lamp ("Unicure VB-15201BY-A" manufactured by USHIO Electric Co., Ltd.) in a nitrogen atmosphere. 2 (Based on 365nm) ultraviolet light was applied to form an optically anisotropic layer (E1-2). In this way, a liquid crystal phase difference layer (R1-2) comprising a substrate layer (B1-2) / vertical alignment film (D1-2) / optically anisotropic layer (E1-2) was obtained. The film thickness of the optically anisotropic layer (E1-2) was measured using a laser microscope, and the film thickness was 4.5μm. The in-plane phase difference value was measured using KOBRA-WR manufactured by Oji Scientific Instruments Co., Ltd. The results showed that Re (550) = 1nm and Rth (550) = -70nm. Therefore, the optical characteristics are as shown in the following formula (9). It should be noted that the phase difference value of COP at a wavelength of 550nm is approximately 0, so it has no effect on the optical characteristics.

[0253] nx≈ny<nz …(9)

[0254] [Production of phase difference layer (R1)]

[0255] (Preparation of Active Energy Ray-Curable Adhesive (S1))

[0256] The following components were mixed to prepare an active energy ray-curable adhesive (S1).

[0257] 3',4'-Epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate (trade name: CEL2021P, manufactured by Daicel Corporation): 70 parts by mass

[0258] Neopentyl glycol diglycidyl ether (trade name: EX-211, manufactured by Nagase ChemteX Co., Ltd.): 20 parts by mass

[0259] 2-Ethylhexyl glycidyl ether (trade name: EX-121, manufactured by Nagase ChemteX Co., Ltd.): 10 parts by mass

[0260] Cationic polymerization initiator (trade name: CPI-100_50% solution, manufactured by San-Apro Co., Ltd.): 4.5 parts by mass (substantial solid content: 2.25 parts by mass)

[0261] 1,4-Diethoxynaphthalene: 2 parts by mass

[0262] (Fabrication of Phase Difference Layer (R1))

[0263] The liquid crystal retardation layer (R1-1) and the liquid crystal retardation layer (R1-2) were bonded together using an active energy ray-curable adhesive (S1) (1 μm thick), with their respective optically anisotropic layers (the surfaces opposite the substrate layer) facing the bonding surface. The active energy ray-curable adhesive (S1) was cured by irradiation with ultraviolet light, resulting in a substrate-layered retardation layer (R1) stacked in the following order: 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).

[0264] 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.

[0265] <Production of Retardation Layer (R2)>

[0266] 2 parts of a polymer (1) having a number average molecular weight of 28,000 represented by the following formula (1) and 98 parts of o-xylene were mixed, and the obtained mixture was stirred at 80° C. for 1 hour to obtain a composition (O2) for forming a photo-alignment film.

[0267] [Chemical Formula 12]

[0268]

[0269] [Wherein, Me represents a methyl group.]

[0270] [Preparation of polymerizable liquid crystal composition]

[0271] 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, BYK-Chemie, trade name: BYK-361N) (0.12 parts), 2-dimethylamino-2-benzyl-1-(4-morpholinophenyl)butan-1-one (photopolymerization initiator, Ciba Specialty Chemicals, trade name: Irgacure 369) (3.0 parts), and LALOMER LR9000 (trade name, BASF Japan) (2.0 parts) were mixed. Anisole was also added to give 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 Japanese Patent Application Laid-Open No. 2010-31223. The maximum absorption wavelength λmax(LC) of the polymerizable liquid crystal compound (C2-1) measured in chloroform within the wavelength range of 300 to 400 nm was 350 nm.

[0272] Polymerizable liquid crystal compound (C2-1): a compound represented by the following formula

[0273] [Chemical Formula 13]

[0274]

[0275] Polymerizable liquid crystal compound (C2-2): a compound represented by the following formula

[0276] [Chemical Formula 14]

[0277]

[0278] [Preparation of Phase Difference Layer-Forming Composition (Y2)]

[0279] 86.0 parts of a polymerizable liquid crystal compound (C2-1), 14.0 parts of a 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 also added to achieve 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).

[0280] [Production of Retardation Layer (R2)]

[0281] A triacetyl cellulose film (KC4CZ-TAC, 40 μm thick, manufactured by Konica Minolta, Inc.) was treated once using a corona treatment apparatus (AGF-B10; manufactured by Kasuga Electric Co., Ltd.) at an output of 0.3 kW and a treatment speed of 3 m / min. A photo-alignment film-forming composition (O2) was applied to the corona-treated surface using a bar coater and dried at 90°C for 1 minute. The film was then exposed to UV light at 100 mJ / cm using a polarized UV irradiation apparatus (SPOT CURE SP-7 with a polarizing film unit; manufactured by Ushio Electric Co., Ltd.). 2 Polarized UV exposure was performed with an accumulated light intensity of 100 nm to form a photo-alignment film (D2). The thickness of the obtained photo-alignment film (D2) was measured using an ellipsometer M-220 (manufactured by JASCO Corporation) and found to be 34 nm.

[0282] Next, the retardation layer-forming composition (Y2) was applied to the photo-alignment film (D2) using a bar coater and dried at 120°C for 1 minute. Then, ultraviolet light (in a nitrogen atmosphere, cumulative light intensity at a wavelength of 313 nm: 500 mJ / cm2) was irradiated from the surface coated with the retardation layer-forming composition (Y2) using a high-pressure mercury lamp (Unicure VB-15201BY-A; manufactured by USHIO Electric Co., Ltd.). 2), and then irradiated with ultraviolet light from the same surface under the same conditions to produce an optically anisotropic layer (E2). This formed a retardation layer (R2) consisting of a laminate of triacetylcellulose film (base layer (B2)), photo-alignment film (D2), and 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 base layer (B2), photo-alignment film (D2), and optically anisotropic layer (E2) was 0.79.

[0283] <Production of Retardation Layer (R3)>

[0284] The liquid crystal retardation layer (R1-1) produced above was used as the retardation layer (R3).

[0285] <Haze Measurement Method>

[0286] The measurement target (an anti-glare film, or a layer comprising a protective film and an optically anisotropic layer) was bonded to a glass substrate using an optically clear adhesive. Measurements were performed using a haze meter "HM-150" manufactured by Murakami Color Research Laboratory Co., Ltd., in accordance with JIS K7136. For anti-glare films, the anti-glare layer-forming substrate was bonded to the glass surface, with light incident from the anti-glare layer side. For layers comprising a protective film and an optically anisotropic layer, the optically anisotropic layer was bonded to the glass surface, with light incident from the protective film side.

[0287] In the above, the “layer including the protective film and the optically anisotropic layer” to be measured was prepared as shown below. The retardation layer (R2) prepared as described above was used as it is.

[0288] (Method for Producing Layer Containing Protective Film and Optically Anisotropic Layer in Retardation Layer (R1))

[0289] The base 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 the protective film (F1) were bonded together using the 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) / base layer (B1-2). The base layer (B1-2) was peeled off from the laminate thus obtained, resulting 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). This refers to the "layer comprising a protective film and an optically anisotropic layer" when using the retardation layer (R1). The internal haze of the laminate consisting 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.

[0290] (Method for Producing Layer Containing Protective Film and Optically Anisotropic Layer in Retardation Layer (R3))

[0291] The surface of the optically anisotropic layer (E1-1) of the retardation layer (R3) (=liquid crystal retardation layer (R1-1)) prepared above was bonded to the surface of the protective film (F1) prepared above using an adhesive layer (AD1). This resulted in a laminate having a laminate structure of protective film (F1) / adhesive layer (AD1) / optically anisotropic layer (E1-1) / photo-alignment film (D1-1) / base layer (B1-1). The base layer (B1-1) was peeled off from the laminate thus obtained, yielding a laminate having a laminate structure of protective film (F1) / adhesive layer (AD1) / optically anisotropic layer (E1-1) / photo-alignment film (D1-1). This constitutes the "layer comprising the protective film and the optically anisotropic layer" when the 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.

[0292] <Measurement Method of Ultraviolet Absorbance (or Transmittance) (380nm)>

[0293] Cut the test object (anti-glare film or protective film) into 30 mm x 30 mm pieces and measure the transmittance (%) at a wavelength of 200 to 510 nm using a UV-2450 UV-visible spectrophotometer manufactured by Shimadzu Corporation.

[0294] <Example 1>

[0295] [Production of Anti-Glare Film (AG1)]

[0296] As shown below, an anti-glare layer was formed on the anti-glare layer-forming base material layer to obtain an anti-glare film (AG1).

[0297] An anti-glare layer-forming coating liquid 1 having the following formulation was applied onto a 25 μm-thick triacetyl cellulose substrate ("KC2UA" manufactured by Konica Minolta, Inc., 25 μm thick) serving as an anti-glare layer-forming substrate layer (AG1-2). The substrate was dried at 70°C for 30 seconds at a wind speed of 5 m / s. The substrate was then irradiated with ultraviolet light (nitrogen atmosphere, cumulative light intensity at a wavelength of 313 nm: 100 mJ / cm) from the side on which the anti-glare layer-forming coating liquid had been applied. 2 ) and cured the coating to form an anti-glare layer (AG1-1), thereby obtaining an anti-glare film (AG1). The anti-glare layer (AG1-1) had a thickness of 3.5 μm. When laminating the anti-glare film (AG1) to another layer, the anti-glare layer-forming substrate layer (AG1-2) was laminated to the other layer.

[0298] ―――――――――――――――――――――――――

[0299] (Anti-glare layer forming coating liquid 1)

[0300] Acrylic acid-styrene copolymer particles (organic fine particles, average primary particle size 2.0 μm, refractive index 1.52, manufactured by Sekisui Chemicals Co., Ltd.): 2.0 parts by mass

[0301] Fumed silica (inorganic fine particles, octylsilane-treated, average primary particle size 12 nm, manufactured by Nippon Aerosil): 2.0 parts by mass

[0302] Pentaerythritol tetraacrylate (PETTA) (product name "PETA", manufactured by Daicel-Cytec): 60 parts by mass

[0303] Urethane acrylate (product name "UV1700B", manufactured by Nippon Synthetic Chemical Co., Ltd.): 40 parts by mass

[0304] Polymerization initiator (product name "Irgacure 184", manufactured by BASF Japan): 5 parts by mass

[0305] Polyether-modified silicone (product name "TSF4460", manufactured by Momentive Performance Materials): 0.025 parts by mass

[0306] Toluene: 105 parts by mass

[0307] Isopropyl alcohol: 30 parts by mass

[0308] Cyclohexanone: 15 parts by mass

[0309] ―――――――――――――――――――――――――

[0310] [Production of Polarizing Plates]

[0311] An anti-glare film (AG1) was laminated to one side of the prepared polarizing film (P) using a water-based adhesive (A). A protective film (F1) (triacetylcellulose film (KC4CZ-TAC manufactured by Konica Minolta, Inc., thickness 40 μm)) was laminated to the opposite side using a water-based adhesive (A). The film was then dried at 80°C for 3 minutes to obtain a linear polarizing plate (PL1).

[0312] [Fabrication of Circular Polarizing Plate]

[0313] The substrate 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 polarizing plate (PL1) prepared above using an adhesive layer (AD1). The retardation layer (R1) and the linear polarizing plate (PL1) were bonded such that the angle formed between the slow axis of the optically anisotropic layer (E1-1) and the transmission axis of the polarizing film was rotated 45 degrees counterclockwise with respect to the transmission axis of the polarizing film. Thus, a circularly polarizing plate having a laminated structure of anti-glare 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) / base material layer (B1-2) was obtained.

[0314] The substrate layer (B1-2) was peeled from the circularly polarizing plate produced above. A separator was bonded to the exposed surface of the photo-alignment film (D1-2) via the adhesive layer (AD2). This yielded a circularly polarizing plate with a separator having a laminated structure of anti-glare 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.

[0315] [evaluate]

[0316] (Glare)

[0317] The separator was removed from the circularly polarizing plate with separator, and the plate was attached to an organic electroluminescent display panel via the exposed adhesive layer (AD2). With the image display device displaying green, the anti-glare film side was visually observed from a distance of 30 cm. Surface glare (a phenomenon such as blurring or flickering on the display screen) was sensory evaluated. The evaluation criteria are as follows.

[0318] Rating "A ＋ ”: There is no glare at all, and I don’t mind it when lighting up the screen.

[0319] Rating "A": Almost no glare occurs, and it is not noticeable when the screen is lit.

[0320] Evaluation "B": Glare occasionally occurs, but does not cause any problem in use as a liquid crystal display device.

[0321] Evaluation "C": Glare frequently occurs, but does not cause any problem when used as a liquid crystal display device.

[0322] Rating "D": Glare often occurs, and the image becomes unclear, making it difficult to use.

[0323] (Anti-glare)

[0324] The separator was removed from the circularly polarizing plate with separator, and the plate was attached to an organic electroluminescent display panel via the exposed adhesive layer (AD2). With nothing reflected on the display screen, a three-wavelength fluorescent lamp was illuminated above the surface facing the anti-glare layer, causing the light to reflect off the surface. The reflected light was visually observed to evaluate the anti-glare properties. The evaluation criteria are as follows.

[0325] Evaluation "Yes": The observed outline of the fluorescent lamp is blurred.

[0326] Evaluation "None": The observed outline of the fluorescent lamp is not blurred at all.

[0327] (Appearance)

[0328] The separator was removed from the circularly polarizing plate with separator, and the device was attached to an organic electroluminescent display panel via the exposed adhesive layer (AD2). With the image display set to green, a three-wavelength fluorescent lamp was illuminated above the surface facing the anti-glare layer, causing the light to reflect from the surface. In this state, the anti-glare film side was visually observed from a distance of 30 cm. The appearance of the image display at this time was subjected to a sensory evaluation. The evaluation criteria are as follows.

[0329] Evaluation "A": High anti-glare properties, with clear visibility achieved while suppressing reflection of external light. There is also almost no glare.

[0330] Evaluation "B": The anti-glare property is sufficiently high, and clear visibility is achieved while suppressing reflection of external light. There is also little glare.

[0331] Evaluation "C": Anti-glare properties were slightly insufficient, but clear visibility was obtained.

[0332] (Polarizer Deterioration)

[0333] The transmittance Ty of the circularly polarizing plates obtained in the examples was determined. This measurement was performed using a spectrophotometer (V-7100, manufactured by JASCO Corporation). The change rate between the Ty value before exposure to an ultraviolet weathering tester (U48, manufactured by Suga Test Instruments Co., Ltd.) and the Ty value 100 hours after exposure was determined.

[0334] Evaluation "Good": The change rate is less than 0.5%.

[0335] Evaluation “Acceptable”: The rate of change exceeds 0.5%.

[0336] <Example 2>

[0337] [Fabrication of Circular Polarizing Plate]

[0338] The phase difference layer (R2), polarizing film (P), and anti-glare film (AG1) prepared as described above were stacked in this order. A water-based adhesive was injected into each of the phase difference layer (R2) so that the triacetyl cellulose film (substrate layer (B2) side was in contact with the polarizing film (P), and so that the surface of the polarizing film (P) opposite to the phase difference layer (R2) was in contact with the anti-glare film (AG1), and the layers were laminated using a clamping roller. At this time, the transmission axis of the polarizing film (P) and the slow axis of the optically anisotropic layer (E2) of the phase difference layer (R2) were rotated 45° counterclockwise with respect to the transmission axis of the polarizing film. The plates were dried at 60°C for 2 minutes to obtain a circular polarizing plate having a stacked structure of anti-glare film (AG1) / adhesive layer / polarizing film (P) / adhesive layer / substrate layer (B2) / photo-alignment film (D2) / optically anisotropic layer (E2).

[0339] A separator was bonded to the surface of the optically anisotropic layer (E2) of the circularly polarizing plate prepared above via an adhesive layer (AD2). This yielded a circularly polarizing plate with a separator having a laminated structure of anti-glare film (AG1) / adhesive layer / polarizing film (P) / adhesive layer / base layer (B2) / photo-alignment film (D2) / optically anisotropic layer (E2) / adhesive layer (AD2) / separator.

[0340] <Example 3>

[0341] [Fabrication of Circular Polarizing Plate]

[0342] The surface of the optically anisotropic layer (E1-1) of the retardation layer (R3) (=liquid crystal retardation layer (R1-1)) prepared above was bonded to the surface of the protective film (F1) of the linear polarizing plate (PL1) prepared above using an adhesive layer (AD1). The retardation layer (R3) and the linear polarizing plate (PL1) were bonded together so that the angle formed between the slow axis of the optically anisotropic layer (E1-1) and the transmission axis of the polarizing film was rotated 135 degrees counterclockwise with respect to the transmission axis of the polarizing film. This produced a circularly polarizing plate having a laminated structure of anti-glare 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) / base layer (B1-1).

[0343] The substrate layer (B1-1) was peeled from the circularly polarizing plate produced above. A separator was bonded to the exposed surface of the photo-alignment film (D1-1) via the adhesive layer (AD2). This yielded a circularly polarizing plate with a separator having a laminated structure of anti-glare 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.

[0344] <Example 4>

[0345] A circularly polarizing plate with a separator of Example 4 was obtained in the same manner as in Example 1 except that the anti-glare layer-forming coating liquid 1 was replaced with the following anti-glare layer-forming coating liquid 2 to form an anti-glare layer (AG2-1) having a film thickness of 2.9 μm to obtain an anti-glare film (AG2).

[0346] ―――――――――――――――――――――――――

[0347] (Anti-glare layer forming coating liquid 2)

[0348] Acrylic acid-styrene copolymer particles (organic fine particles, average primary particle size 3.5 μm, refractive index 1.52, manufactured by Sekisui Chemicals Co., Ltd.): 2.0 parts by mass

[0349] Fumed silica (inorganic fine particles, hexamethyldisilazane-treated, average primary particle size 50 nm, manufactured by NIPPONAEROSIL): 3.0 parts by mass

[0350] Pentaerythritol tetraacrylate (PETTA) (product name "PETA", manufactured by Daicel-Cytec): 60 parts by mass

[0351] Urethane acrylate (product name "UV1700B", manufactured by Nippon Synthetic Chemical Co., Ltd.): 40 parts by mass

[0352] Polymerization initiator (product name "Irgacure 184", manufactured by BASF Japan): 5 parts by mass

[0353] Polyether-modified silicone (product name "TSF4460", manufactured by Momentive Performance Materials): 0.025 parts by mass

[0354] Hydroxyphenyltriazine-based UV absorber (product name: "Tinuvin 477", manufactured by BASF Japan. Maximum absorption wavelength: 356 nm): 10 parts by mass

[0355] 1.0 part by mass of cyanine pigment (product name "NK-9994", manufactured by Hayashibara Co., Ltd.; maximum absorption wavelength: 405 nm)

[0356] Toluene: 105 parts by mass

[0357] Isopropyl alcohol: 30 parts by mass

[0358] Cyclohexanone: 15 parts by mass

[0359] ―――――――――――――――――――――――――

[0360] <Example 5>

[0361] A circularly polarizing plate with a separator of Example 5 was obtained in the same manner as in Example 2 except that the anti-glare layer-forming coating liquid 1 was replaced with the anti-glare layer-forming coating liquid 2 to form an anti-glare layer (AG2-1) having a film thickness of 2.9 μm to obtain an anti-glare film (AG2).

[0362] <Example 6>

[0363] A circularly polarizing plate with a separator of Example 6 was obtained in the same manner as in Example 3 except that the anti-glare layer-forming coating liquid 1 was replaced with the anti-glare layer-forming coating liquid 2 described above to form an anti-glare layer (AG2-1) having a film thickness of 2.9 μm to obtain an anti-glare film (AG2).

[0364] <Example 7>

[0365] A circularly polarizing plate with a separator of Example 7 was obtained in the same manner as in Example 4 except that the thickness of the protective film bonded to the polarizing film (P) was changed to 25 μm.

[0366] <Example 8>

[0367] A circularly polarizing plate with a separator of Example 8 was obtained in the same manner as in Example 5 except that the thickness of the base material layer (B2) was changed to 25 μm.

[0368] <Example 9>

[0369] A circularly polarizing plate with a separator of Example 9 was obtained in the same manner as in Example 6 except that the thickness of the protective film bonded to the polarizing film (P) was changed to 25 μm.

[0370] <Example 10>

[0371] A circularly polarizing plate with a separator of Example 10 was obtained in the same manner as in Example 1 except that the anti-glare layer-forming coating liquid 1 was replaced with the following anti-glare layer-forming coating liquid 3 to form an anti-glare layer (AG3-1) having a film thickness of 5.9 μm to obtain an anti-glare film (AG3).

[0372] ―――――――――――――――――――――――――

[0373] (Anti-glare layer forming coating liquid 3)

[0374] Acrylic acid-styrene copolymer particles (organic fine particles, average primary particle size 3.5 μm, refractive index 1.52, manufactured by Sekisui Chemicals Co., Ltd.): 4.0 parts by mass

[0375] Fumed silica (inorganic fine particles, octylsilane-treated, average primary particle size 12 nm, manufactured by Nippon Aerosil): 4.0 parts by mass

[0376] Pentaerythritol tetraacrylate (PETTA) (product name "PETA", manufactured by Daicel-Cytec): 60 parts by mass

[0377] Urethane acrylate (product name "UV1700B", manufactured by Nippon Synthetic Chemical Co., Ltd.): 40 parts by mass

[0378] Polymerization initiator (product name "Irgacure 184", manufactured by BASF Japan): 5 parts by mass

[0379] Polyether-modified silicone (product name "TSF4460", manufactured by Momentive Performance Materials): 0.025 parts by mass

[0380] Hydroxyphenyltriazine-based UV absorber (product name: "Tinuvin 477", manufactured by BASF Japan. Maximum absorption wavelength: 356 nm): 10 parts by mass

[0381] 1.0 part by mass of cyanine pigment (product name "NK-9994", manufactured by Hayashibara Co., Ltd.; maximum absorption wavelength: 405 nm)

[0382] Toluene: 105 parts by mass

[0383] Isopropyl alcohol: 30 parts by mass

[0384] Cyclohexanone: 15 parts by mass

[0385] ―――――――――――――――――――――――――

[0386] <Example 11>

[0387] A circularly polarizing plate with a separator of Example 11 was obtained in the same manner as in Example 2 except that the anti-glare layer-forming coating liquid 1 was replaced with the anti-glare layer-forming coating liquid 3 to form an anti-glare layer (AG3-1) having a film thickness of 5.9 μm to obtain an anti-glare film (AG3).

[0388] <Example 12>

[0389] A circularly polarizing plate with a separator of Example 12 was obtained in the same manner as in Example 3 except that the anti-glare layer-forming coating liquid 1 was replaced with the anti-glare layer-forming coating liquid 3 to form an anti-glare layer (AG3-1) having a film thickness of 5.9 μm to obtain an anti-glare film (AG3).

[0390] <Example 13>

[0391] A circular polarizing plate with a separator of Example 13 was obtained in the same manner as in Example 1 except that the anti-glare layer-forming substrate layer was replaced with a 40 μm-thick triacetylcellulose substrate (“KC4UYATAC” manufactured by Konica Minolta, Inc., 40 μm thick) to obtain an anti-glare film (AG4).

[0392] <Example 14>

[0393] A circularly polarizing plate with a separator of Example 14 was obtained in the same manner as in Example 2 except that the anti-glare layer-forming substrate layer was replaced with a 40 μm-thick triacetylcellulose substrate (“KC4UYATAC” manufactured by Konica Minolta, Inc., 40 μm thick) to obtain an anti-glare film (AG4).

[0394] <Example 15>

[0395] A circular polarizing plate with a separator of Example 15 was obtained in the same manner as in Example 3 except that the anti-glare layer-forming substrate layer was replaced with a 40 μm-thick triacetylcellulose substrate (“KC4UYATAC” manufactured by Konica Minolta, Inc., 40 μm thick) to obtain an anti-glare film (AG4).

[0396] <Comparative Example 1>

[0397] A circularly polarizing plate with a diaphragm of Comparative Example 1 was obtained in the same manner as in Example 13 except that the anti-glare layer was not provided.

[0398] Comparative Example 2

[0399] A circularly polarizing plate with a separator of Comparative Example 2 was obtained in the same manner as in Example 3 except that the anti-glare layer-forming coating liquid 1 was replaced with the following anti-glare layer-forming coating liquid 4 to form an anti-glare layer (AG6-1) having a film thickness of 9.3 μm to obtain an anti-glare film (AG6).

[0400] ―――――――――――――――――――――――――

[0401] (Anti-glare layer forming coating liquid 4)

[0402] Acrylic acid-styrene copolymer particles (organic fine particles, average primary particle size 5.0 μm, refractive index 1.52, manufactured by Sekisui Chemicals Co., Ltd.): 18.0 parts by mass

[0403] Fumed silica (inorganic fine particles, octylsilane-treated, average primary particle size 5 nm, manufactured by Nippon Aerosil): 3.0 parts by mass

[0404] Pentaerythritol tetraacrylate (PETTA) (product name "PETA", manufactured by Daicel-Cytec): 60 parts by mass

[0405] Urethane acrylate (product name "UV1700B", manufactured by Nippon Synthetic Chemical Co., Ltd.): 40 parts by mass

[0406] Polymerization initiator (product name "Irgacure 184", manufactured by BASF Japan): 5 parts by mass

[0407] Polyether-modified silicone (product name "TSF4460", manufactured by Momentive Performance Materials): 0.025 parts by mass

[0408] Hydroxyphenyltriazine-based UV absorber (product name: "Tinuvin 477", manufactured by BASF Japan. Maximum absorption wavelength: 356 nm): 10 parts by mass

[0409] 1.0 part by mass of cyanine pigment (product name "NK-9994", manufactured by Hayashibara Co., Ltd.; maximum absorption wavelength: 405 nm)

[0410] Toluene: 105 parts by mass

[0411] Isopropyl alcohol: 30 parts by mass

[0412] Cyclohexanone: 15 parts by mass

[0413] ―――――――――――――――――――――――――

[0414] <Example 16>

[0415] Example 16 is a mode in which the circularly polarizing plate with a separator produced in Example 2 has an interposed layer between the anti-glare film (AG1) and the polarizing film (P).

[0416] [Preparation of triacetyl cellulose with a hard coat layer containing a UV absorber]

[0417] A triacetylcellulose (TAC) film having a hard coat layer containing an ultraviolet absorber (hereinafter, sometimes referred to as a "NUV-HC layer") as a surface treatment layer was prepared.

[0418] (Preparation of Surface Treatment Layer Composition)

[0419] As a surface treatment layer composition, 20 parts of EBECRYL 4858 (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 Co., 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 homogeneous solution.

[0420] (Synthesis example 1)

[0421] A 200 mL four-necked flask equipped with a Dimrot cooler and a thermometer was placed under a nitrogen atmosphere. 10 g of UVA-M-02 powder, a compound represented by the following formula, synthesized according to the referenced patent document (Japanese Patent Application Laid-Open No. 2014-194508), 3.7 g of acetic anhydride (Wako Pure Chemical Industries, Ltd.), 5.8 g of 2-ethoxyethyl cyanoacetate (Tokyo Chemical Industry Co., Ltd.), and 60 g of acetonitrile (Wako Pure Chemical Industries, Ltd.) were placed and stirred with a magnetic stirrer. At an internal temperature of 25°C, 4.7 g of N,N-diisopropylethylamine (hereinafter referred to as "DIPEA"; Tokyo Chemical Industry Co., Ltd.) was added dropwise from a dropping funnel over 1 hour. After the addition was complete, the internal temperature was maintained at 25°C for a further 2 hours. After the reaction was completed, the acetonitrile was removed using a reduced pressure evaporator. Toluene was added to the resulting oil, and the resulting insoluble matter was removed by filtration. The filtrate was concentrated again using a vacuum evaporator, and the concentrated solution was purified by column chromatography (silica gel) and recrystallized from toluene to obtain the target product. 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%. In addition, the absorption maximum wavelength (λmax) of UVA-01 was measured using a spectrophotometer UV-3150 (manufactured by Shimadzu Corporation). The results showed that λmax = 389 nm (in 2-butanone), ε(400) was 125 L / (g·cm), and ε(420) / ε(400) was 0.0153.

[0422] Then, 1 As a result of H-NMR analysis, the following peaks were observed, thereby confirming the formation of compound UVA-01.

[0423] 1 H-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)

[0424] [Chemical Formula 15]

[0425]

[0426] (Formation of surface treatment layer)

[0427] The surface treatment layer composition was applied to a 25 μm thick triacetylcellulose film using a wire bar to a cured film thickness of 8 μm, forming a coating film. Dry air at 70°C was passed through the resulting coating film at a flow rate of 0.5 m / s for 30 seconds to evaporate the solvent. The film was then placed in a nitrogen atmosphere (oxygen concentration 200 ppm or less) to a cumulative radiation dose of 200 mJ / cm2 The surface treatment layer (NUV-HC layer) was formed by irradiating the film with ultraviolet light to cure it. The surface treatment layer (NUV-HC layer) had a transmittance Tr(450) of 90% for light with a wavelength of 450 nm, a transmittance Tr(420) of 50% for light with a wavelength of 420 nm, and a transmittance Tr(400) of 0% for light with a wavelength of 400 nm. Thus, a transparent protective film 1 was obtained, which was a triacetyl cellulose film having a NUV-HC layer. The thickness of the transparent protective film 1 was 33 μm. The transmittance of the transparent protective film 1 at 380 nm was 0%.

[0428] [Fabrication of Circular Polarizing Plate]

[0429] The retardation layer (R2), polarizing film (P), and triacetylcellulose with a hard coat layer containing a UV absorber prepared above were stacked in this order. A water-based adhesive was injected so that the triacetylcellulose film side of the retardation layer (R2) was in contact with the polarizing film (P), and the side of the polarizing film (P) opposite the retardation layer (R2) was in contact with the triacetylcellulose film side of the triacetylcellulose with a hard coat layer containing a UV absorber. The plates were then laminated using a nip roll. This was done so that the absorption axis of the polarizing film (P) and the slow axis of the optically anisotropic layer (E2) of the retardation layer (R2) were at a 45° angle. Drying was performed at 60°C for 2 minutes to obtain a circularly polarizing plate having a laminated structure of triacetylcellulose with a hard coat layer containing a UV absorber / adhesive layer / polarizing film (P) / adhesive layer / base layer (B2) / photo-alignment film (D2) / optically anisotropic layer (E2).

[0430] Next, an anti-glare film (AG1) was laminated to the surface of the triacetyl cellulose with a hard coat layer containing a UV absorber of the circularly polarizing plate prepared above, via an adhesive layer (AD1). This yielded a circularly polarizing plate having a laminated structure of anti-glare film (AG1) / adhesive layer (AD1) / triacetyl cellulose with a hard coat layer containing a UV absorber / adhesive layer / polarizing film (P) / adhesive layer / base layer (B2) / photo-alignment film (D2) / optically anisotropic layer (E2).

[0431] Next, a separator was bonded to the surface of the optically anisotropic layer (E2) of the circularly polarizing plate prepared above via an adhesive layer (AD2). This yielded a circularly polarizing plate with a separator having a laminated structure of anti-glare film (AG1) / adhesive layer (AD1) / triacetylcellulose with a hard coat layer containing a UV absorber / adhesive layer / polarizing film (P) / adhesive layer / base layer (B2) / photo-alignment film (D2) / optically anisotropic layer (E2) / adhesive layer (AD2) / separator.

[0432] <Example 17>

[0433] Example 17 is an embodiment in which the type of the retardation layer is changed in the circularly polarizing plate with a diaphragm produced in Example 16.

[0434] [Production of Polarizing Plates]

[0435] Using a roll laminator, triacetyl cellulose with a hard coat layer containing a UV absorber, similar to that used in Example 16, was bonded to one side of the polarizing film (P) with an aqueous adhesive. A protective film (F1) was bonded to the side opposite the triacetyl cellulose with a hard coat layer containing a UV absorber with an aqueous adhesive. The film was then dried at 80°C for 3 minutes to produce a linear polarizing plate (PL2-1).

[0436] (Fabrication of a Polarizing Plate with a Second Surface Treatment Layer)

[0437] An anti-glare film (AG1) was laminated to the triacetylcellulose film surface with a hard coat layer containing a UV absorber of the linear polarizing plate (PL2) prepared above via an adhesive layer (AD1). This yielded a linear polarizing plate (PL2-2) having a laminated structure of anti-glare film (AG1) / adhesive layer (AD1) / triacetylcellulose film with a hard coat layer containing a UV absorber / adhesive layer / polarizing film (P) / adhesive layer / protective film (F1).

[0438] [Fabrication of Circular Polarizing Plate]

[0439] The protective film (F1) side of the linear polarizing plate (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 an adhesive layer (AD1). This produced a circularly polarizing plate having a laminated structure of anti-glare film (AG1) / adhesive layer (AD1) / triacetylcellulose with a hard coat layer containing a UV absorber / adhesive layer / polarizing film (P) / adhesive layer / protective film (F1) / adhesive layer (AD1) / optically anisotropic layer (E1-1) / photo-alignment film (D1-1) / base layer (B1-1).

[0440] Next, the substrate layer (B1-1) was peeled from the circularly polarizing plate prepared above. A separator was bonded 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 having a laminated structure consisting of anti-glare film (AG1) / adhesive layer (AD1) / triacetylcellulose with a hard coat layer containing a UV absorber / adhesive layer / polarizing film (P) / adhesive layer / protective film (F1) / optically anisotropic layer (E1-1) / photo-alignment film (D1-1) / adhesive layer (AD2) / separator.

[0441] <Example 18>

[0442] A circularly polarizing plate with a separator of Example 18 was obtained in the same manner as in Example 16 except that the anti-glare layer-forming coating liquid 1 was replaced with the following anti-glare layer-forming coating liquid 5 to form an anti-glare layer (AG5-1) having a film thickness of 5.9 μm to obtain an anti-glare film (AG5).

[0443] ―――――――――――――――――――――――――

[0444] (Anti-glare layer forming coating liquid 5)

[0445] Acrylic acid-styrene copolymer particles (organic fine particles, average primary particle size 2.0 μm, refractive index 1.52, manufactured by Sekisui Chemicals Co., Ltd.): 3.0 parts by mass

[0446] Fumed silica (inorganic fine particles, hexamethyldisilazane-treated, average primary particle size 50 nm, manufactured by NIPPONAEROSIL): 2.0 parts by mass

[0447] Pentaerythritol tetraacrylate (PETTA) (product name "PETA", manufactured by Daicel-Cytec): 60 parts by mass

[0448] Isocyanuric acid ethoxy-modified diacrylate (product name "M-215", manufactured by Toagosei Co., Ltd.): 40 parts by mass

[0449] Polymerization initiator (product name "Irgacure 184", manufactured by BASF Japan): 5 parts by mass

[0450] Polyether-modified silicone (product name "TSF4460", manufactured by Momentive Performance Materials): 0.025 parts by mass

[0451] Toluene: 120 parts by mass

[0452] Methyl isobutyl ketone (MIBK): 30 parts by mass

[0453] ―――――――――――――――――――――――――

[0454] <Example 19>

[0455] A circularly polarizing plate with a separator of Example 19 was obtained in the same manner as in Example 17 except that the anti-glare layer-forming coating liquid 1 was replaced with the anti-glare layer-forming coating liquid 5 to form an anti-glare layer (AG5-1) having a film thickness of 5.9 μm to obtain an anti-glare film (AG5).

[0456] Glare and anti-glare properties were evaluated for Examples 2 to 19 and Comparative Examples 1 and 2 in the same manner as in Example 1. The laminated structures, haze values, absorption of light at 380 nm, and evaluations of Examples 1 to 19 and Comparative Examples 1 and 2 are shown in Tables 1 to 3.

[0457] [Table 1]

[0458]

[0459] [Table 2]

[0460]

[0461] [Table 3]

[0462]

[0463] In the embodiment without the anti-glare layer (Comparative Example 1), there was no anti-glare property. In the embodiment with the anti-glare layer but the haze of the anti-glare film was 8.0% (Comparative Example 2), strong glare occurred.

[0464] The anti-glare film with a haze of 0.9% (Examples 1 to 9) showed a high glare suppression effect. Furthermore, the thin protective film (Examples 7 to 9) was particularly effective in suppressing glare.

[0465] Industrial applicability

[0466] The present invention can be used in an organic electroluminescent display device.

Claims

1. An optical laminate comprising an anti-glare layer, an anti-glare layer-forming substrate layer, a polarizing film, a protective film, and a phase difference layer in this order, The haze of the protective film, the retardation layer, and a member located between the protective film and the retardation layer is measured to be 0.3% or more. The haze measured together with the anti-glare layer and the anti-glare layer-forming base material layer is less than 5%.

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

3. The optical laminate according to claim 1, wherein The thickness of the anti-glare layer-forming substrate layer is 15 μm to 30 μm.

4. The optical laminate according to claim 1, wherein The thickness of the protective film is 15 μm to 30 μm. The optical layered body according to claim 4 , wherein: The distance between the surface of the anti-glare layer-forming substrate layer on the polarizing film side and the surface of the retardation layer on the opposite side to the polarizing film side is 70 μm or less. The optical layered body according to claim 1 , wherein: The haze measured together with the protective film, the retardation layer, and a member located between the protective film and the retardation layer is 1.3% or less.

7. The optical layered body according to claim 1, wherein The anti-glare layer-forming base material layer and the polarizing film are directly bonded to each other.

8. An organic electroluminescent display device comprising: An organic electroluminescent display panel and the optical laminate according to any one of claims 1 to 7, which is arranged on the observation side of the organic electroluminescent display panel.

Images