WO2013125211A1 - 光学フィルム、円偏光板および画像表示装置 - Google Patents
光学フィルム、円偏光板および画像表示装置 Download PDFInfo
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- WO2013125211A1 WO2013125211A1 PCT/JP2013/000915 JP2013000915W WO2013125211A1 WO 2013125211 A1 WO2013125211 A1 WO 2013125211A1 JP 2013000915 W JP2013000915 W JP 2013000915W WO 2013125211 A1 WO2013125211 A1 WO 2013125211A1
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- optical film
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Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D207/00—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
- C07D207/02—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D207/44—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having three double bonds between ring members or between ring members and non-ring members
- C07D207/444—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having three double bonds between ring members or between ring members and non-ring members having two doubly-bound oxygen atoms directly attached in positions 2 and 5
- C07D207/448—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having three double bonds between ring members or between ring members and non-ring members having two doubly-bound oxygen atoms directly attached in positions 2 and 5 with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to other ring carbon atoms, e.g. maleimide
- C07D207/452—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having three double bonds between ring members or between ring members and non-ring members having two doubly-bound oxygen atoms directly attached in positions 2 and 5 with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to other ring carbon atoms, e.g. maleimide with hydrocarbon radicals, substituted by hetero atoms, directly attached to the ring nitrogen atom
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D209/00—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom
- C07D209/56—Ring systems containing three or more rings
- C07D209/80—[b, c]- or [b, d]-condensed
- C07D209/82—Carbazoles; Hydrogenated carbazoles
- C07D209/86—Carbazoles; Hydrogenated carbazoles with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to carbon atoms of the ring system
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
- C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
- C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D213/60—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D213/62—Oxygen or sulfur atoms
- C07D213/63—One oxygen atom
- C07D213/64—One oxygen atom attached in position 2 or 6
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- C—CHEMISTRY; METALLURGY
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- C07D265/00—Heterocyclic compounds containing six-membered rings having one nitrogen atom and one oxygen atom as the only ring hetero atoms
- C07D265/04—1,3-Oxazines; Hydrogenated 1,3-oxazines
- C07D265/12—1,3-Oxazines; Hydrogenated 1,3-oxazines condensed with carbocyclic rings or ring systems
- C07D265/14—1,3-Oxazines; Hydrogenated 1,3-oxazines condensed with carbocyclic rings or ring systems condensed with one six-membered ring
- C07D265/20—1,3-Oxazines; Hydrogenated 1,3-oxazines condensed with carbocyclic rings or ring systems condensed with one six-membered ring with hetero atoms directly attached in position 4
- C07D265/22—Oxygen atoms
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- C07D277/00—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings
- C07D277/60—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings condensed with carbocyclic rings or ring systems
- C07D277/62—Benzothiazoles
- C07D277/64—Benzothiazoles with only hydrocarbon or substituted hydrocarbon radicals attached in position 2
- C07D277/66—Benzothiazoles with only hydrocarbon or substituted hydrocarbon radicals attached in position 2 with aromatic rings or ring systems directly attached in position 2
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- C07D295/00—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms
- C07D295/16—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms acylated on ring nitrogen atoms
- C07D295/18—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms acylated on ring nitrogen atoms by radicals derived from carboxylic acids, or sulfur or nitrogen analogues thereof
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
- C07D307/02—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings
- C07D307/34—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
- C07D307/56—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D307/60—Two oxygen atoms, e.g. succinic anhydride
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- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
- G02B1/111—Anti-reflection coatings using layers comprising organic materials
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
- G02B30/25—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type using polarisation techniques
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
- G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
- G02B5/3091—Birefringent or phase retarding elements for use in the UV
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/32—Holograms used as optical elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
- G02F1/133541—Circular polarisers
Definitions
- the present invention relates to an optical film, a circularly polarizing plate, and an image display device.
- ⁇ / 4 retardation film can convert linearly polarized light into circularly polarized light and elliptically polarized light, or convert circularly polarized light and elliptically polarized light into linearly polarized light.
- Such a ⁇ / 4 retardation film is widely used for various optical applications in image display devices and optical pickup devices.
- a ⁇ / 4 retardation film used in an optical device using a laser light source of a specific wavelength, such as an optical pickup device has a 1 ⁇ 4 wavelength retardation (hereinafter also referred to as retardation) with respect to only light of a specific wavelength. ).
- retardation 1 ⁇ 4 wavelength retardation
- a ⁇ / 4 retardation film used for a color image display device, a visible light antireflection film, or the like is required to give a quarter wavelength retardation to light in the entire visible light region.
- the ⁇ / 4 retardation film used in the color image display device has a negative wavelength dispersion in which the retardation imparted to the long wavelength light is larger than the retardation imparted to the short wavelength light. It is required to have (reverse wavelength dispersion).
- a film that imparts a quarter-wave phase difference and exhibits sufficient negative wavelength dispersion (reverse wavelength dispersion); in particular, a single layer and a wavelength of ⁇ / 4 with respect to light in a wide wavelength region It was difficult to obtain a film capable of imparting a phase difference.
- a conventional ⁇ / 4 retardation film exhibiting negative wavelength dispersion (reverse wavelength dispersion) is obtained by laminating retardation films having different wavelength dispersions so that their optical axes cross each other.
- retardation films having different wavelength dispersions For example, refer to Patent Document 1).
- the film contains a material having high retardation.
- a film containing a material having a high retardation development property can reduce the thickness of the film, but the in-plane retardation and the retardation in the thickness direction are likely to fluctuate greatly due to slight variations in the thickness of the film. For this reason, there is a problem that not only adjustment of the phase difference is difficult, but also color unevenness and a decrease in contrast occur.
- Patent Document 2 includes an optically anisotropic layer A having a retardation of ⁇ / 2 wavelength and an optically anisotropic layer B having a retardation of ⁇ / 4 wavelength.
- a retardation plate in which one optically anisotropic layer is a layer formed from liquid crystalline molecules.
- the retardation of each optically anisotropic layer is limited to 1 ⁇ 4 wavelength or 1 ⁇ 2 wavelength, as described above, so that the wavelength dispersion of the retardation plate is sufficiently controlled. It was difficult to do.
- Patent Document 3 proposes a stretched film made of cellulose acetate having a specific degree of acetylation.
- Patent Document 4 proposes an optical film containing a compound having a coordinating property imparting group and a birefringence imparting group as a retardation control agent;
- Patent Document 5 discloses a cellulose ester and two or more aromatic rings.
- a retardation plate containing a retardation increasing agent has been proposed; in Patent Document 6, as a retardation control agent, the magnitude of the dipole moment in the direction perpendicular to the molecular long axis direction is An optical film containing a low-molecular compound larger than the magnitude of the dipole moment in the parallel direction has been proposed.
- Japanese Patent Laid-Open No. 10-68816 Japanese Patent Laid-Open No. 2001-91741 Japanese Patent No. 345779 Japanese Patent No. 4583648 Japanese Patent No. 4605908 JP 2007-249180 A
- the stretched film of Patent Document 3 cannot sufficiently control both the phase difference and the wavelength dispersibility by the cellulose ester film alone.
- the retardation controlling agent described in Patent Document 4 has low retardation development (particularly in-plane retardation development), and in order to obtain a desired retardation, the thickness of the film has to be increased.
- the retardation control agent described in Patent Document 6 has extremely poor light resistance.
- the retardation increasing agent described in Patent Document 5 is inferior in reverse wavelength dispersibility, and has problems such as film coloring and light resistance.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to provide an optical film that exhibits high retardation development in the in-plane direction and exhibits sufficient reverse wavelength dispersion even when the film thickness is thin.
- the inventors of the present invention have adopted a cyclic group-based mother nucleus in which the position of a substituent can be relatively freely arranged for the phase difference increasing function. Although excellent in the ascending effect, the wavelength dispersibility was still insufficient.As a result of various investigations by changing the type and combination of the substituents, the wavelength dispersibility was improved when adjacent groups of the substituents were different from each other. It has been found that it is excellent and that such compounds have a unique absorption peak. Furthermore, it has been found that a compound having such an absorption peak exhibits the effect of the present invention even if it is not necessarily within the category of the structure of the compound initially examined. Further, the present inventors have found that by using the optical film, an image display device with little color variation and excellent light resistance can be obtained, and the present invention has been achieved. That is, the said subject which concerns on this invention is solved by the following means.
- An optical film comprising a thermoplastic resin and at least one compound satisfying all of the following (1) to (5): (1)
- the solution absorption spectrum has at least two maximum absorptions in the wavelength region of 200 nm to 350 nm.
- the wavelength of the first maximum absorption among the two maximum absorptions in the wavelength region of 200 nm to 350 nm is ⁇ max1.
- ( ⁇ max1- ⁇ max2) is 20 nm or more, where ⁇ max2 is the wavelength of the second maximum absorption on the shorter wavelength side than the first maximum absorption.
- the aspect ratio of the molecule is 1.70 or more.
- It has a non-aromatic hydrocarbon ring, aromatic heterocycle or non-aromatic heterocycle in the molecule.
- thermoplastic resin and 1% by mass of the compound with respect to the thermoplastic resin A sample film containing 60 ⁇ m in thickness and having a retardation in the in-plane direction at a wavelength of 550 nm before stretching as R 0 A0 (550), the glass of the sample film
- R 0 A1 (550) the phase difference in the in-plane direction at a wavelength of 550 nm after stretching at a temperature 25 ° C. higher than the transition temperature
- R 0 A1 (550) (R 0 A1 (550) ⁇ R 0 A0 (550)) is a stretching ratio.
- the in-plane retardation sensitivity obtained by dividing by A is A, After stretching at a temperature 25 ° C.
- the retardation in the in-plane direction before stretching at a wavelength of 550 nm of the blank film having a thickness of 60 ⁇ m made of the thermoplastic resin is R 0 B0 (550).
- In-plane retardation sensitivity obtained by dividing (R 0 B1 (550) -R 0 B0 (550)) by the draw ratio, where R 0 B1 (550) is the phase difference in the in-plane direction at a wavelength of 550 nm Is B,
- the in-plane retardation increase sensitivity defined by (AB) is 0.1 or more.
- the in-plane phase differences measured at wavelengths of 450 nm, 550 nm and 650 nm are R 0 (450) and R 0 (550, respectively).
- R 0 (650) an optical film characterized by satisfying all of the formulas (a) to (c).
- C 0.83 ⁇ R 0 (550) / R 0 (650) ⁇ 0.97
- the refractive index in the slow axis direction in the plane of the optical film is nx
- the refractive index in the direction orthogonal to the slow axis in the plane of the optical film is ny
- the thickness direction of the optical film is The optical film according to any one of [1] to [4], wherein the relationship of formula (d) is further satisfied when the refractive index is nz.
- W a and W b are a hydrogen atom or a substituent bonded to an atom constituting the ring of Q, the atom bonded to W a and the atom bonded to W b are adjacent to each other, and W a and W b are different from each other, and W a and W b may be bonded to each other to form a ring;
- R 3 represents a substituent;
- m is 0-2; when m is 2, R 3 may be the same or different;
- L 1 and L 2 are each independently a single bond or an alkylene group, an alkenylene group, an alkynylene group, —O—, — (C ⁇ O) —, — (C ⁇ O) —O—, —NR L —, —
- R L
- W a and W b are a hydrogen atom or a substituent bonded to an atom constituting the ring of Q, the atom bonded to W a and the atom bonded to W b are adjacent to each other, and W a and W b are different from each other, and W a and W b may be bonded to each other to form a ring;
- R 3 represents a substituent;
- m is 0-2; when m is 2, R 3 may be the same or different;
- L 1 and L 2 are each independently a single bond or an alkylene group, an alkenylene group, an alkynylene group, —O—, — (C ⁇ O) —, — (C ⁇ O) —O—, —NR L —, —
- R L
- W 1 is a cyclic group, and among the ring constituting atoms of W 1 , the atom bonded to the benzene ring is a carbon atom or a nitrogen atom;
- R 3 represents a substituent;
- m is 0-2; when m is 2, R 3 may be the same or different;
- L 1 and L 2 are each independently a single bond or an alkylene group, an alkenylene group, an alkynylene group, —O—, — (C ⁇ O) —, — (C ⁇ O) —O—, —NR L —, —
- R L represents a hydrogen atom or a substituent;
- R 1 and R 2 each independently represent a substituent
- a circularly polarizing plate comprising the optical film according to any one of [1] to [12].
- An image display device comprising the optical film according to any one of [1] to [12].
- the present invention it is possible to provide an optical film having a high retardation development property in the in-plane direction and sufficient reverse wavelength dispersion even when the film thickness is thin.
- the image display device including the optical film is excellent in black reproducibility under external light and excellent in visibility from an oblique direction.
- optical film of the present invention contains a thermoplastic resin and the compound used in the present invention.
- Thermoplastic resins are cellulose derivatives (eg, cellulose ester resins, cellulose ether resins, etc.), polycarbonate resins, polystyrene resins, polysulfone resins, polyester resins, polyarylate resins, (meth). It may be an acrylic resin, an olefin resin (for example, norbornene resin, cyclic olefin resin, cyclic conjugated diene resin, vinyl alicyclic hydrocarbon resin). Of these, cellulose derivatives, (meth) acrylic resins, polycarbonate resins, and cyclic olefin resins are preferable, cellulose derivatives are more preferable, and cellulose ester resins are most preferable.
- cellulose derivatives eg, cellulose ester resins, cellulose ether resins, etc.
- polycarbonate resins e.g., polystyrene resins, polysulfone resins, polyester resins, polyarylate resins, (meth).
- Cellulose derivative A cellulose derivative is a compound (compound having a cellulose skeleton) that uses cellulose as a raw material.
- cellulose derivatives include cellulose ether (eg, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, cyanoethyl cellulose, etc.), cellulose ester (details will be described later), cellulose ether ester (eg, acetyl methyl cellulose, acetyl ethyl cellulose, acetyl hydroxy).
- the cellulose derivative may be one type or a mixture of two or more types.
- the cellulose ester is a compound obtained by esterifying cellulose and at least one of an aliphatic carboxylic acid and an aromatic carboxylic acid having about 2 to 22 carbon atoms, preferably cellulose and a lower carbon number of 6 or less. It is a compound obtained by esterifying a fatty acid.
- the acyl group contained in the cellulose ester may be linear or branched, may form a ring, and may further have another substituent.
- the acyl group preferably has 2 to 6 carbon atoms, more preferably 2 to 4 carbon atoms, and still more preferably 2 to 3 carbon atoms.
- cellulose ester examples include cellulose acetate, and mixed fatty acid esters such as cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate propionate butyrate, or cellulose acetate phthalate.
- Preferred is cellulose acetate, cellulose acetate butyrate or cellulose acetate propionate.
- the butyryl group that can be contained in the cellulose ester may be linear or branched.
- the total substitution degree of the acyl group of the cellulose ester can be about 2.0 to 3.0.
- the total substitution degree of the acyl group is preferably 2.0 to 2.5 from the viewpoint of improving the retardation development property, and 2.5 to 3.0 from the viewpoint of improving the moisture resistance and the like. Is preferred.
- the substitution degree of the acyl group having 3 or more carbon atoms is preferably 2.0 or less.
- the substitution degree of the acyl group having 3 or more carbon atoms is more than 2.0, the retardation development property tends to be lowered.
- the degree of substitution of the acyl group of the cellulose ester can be measured by the method prescribed in ASTM-D817-96.
- the number average molecular weight of the cellulose derivative is preferably in the range of 6 ⁇ 10 4 to 3 ⁇ 10 5 , and in the range of 7 ⁇ 10 4 to 2 ⁇ 10 5 in order to increase the mechanical strength of the resulting film. More preferably.
- the weight average molecular weight (Mw) and the number average molecular weight (Mn) of the cellulose derivative are measured using gel permeation chromatography (GPC).
- the measurement conditions are as follows. Solvent: methylene chloride; Column: Three Shodex K806, K805, K803G (made by Showa Denko KK) are connected and used; Column temperature: 25 ° C .; Sample concentration: 0.1% by mass; Detector: RI Model 504 (manufactured by GL Sciences); Pump: L6000 (manufactured by Hitachi, Ltd.); Flow rate: 1.0 ml / min
- the content of residual sulfuric acid in the cellulose derivative is preferably in the range of 0.1 to 45 ppm by mass in terms of elemental sulfur, and more preferably in the range of 1 to 30 ppm by mass. Sulfuric acid is considered to remain in the film in a salt state. When the content of the residual sulfuric acid exceeds 45 ppm by mass, the film tends to break when the film is stretched hot or when slitting is performed after the hot stretch.
- the content of residual sulfuric acid can be measured by the method prescribed in ASTM D817-96.
- the content of free acid in the cellulose derivative is preferably 1 to 500 ppm by mass, more preferably 1 to 100 ppm by mass, and even more preferably 1 to 70 ppm by mass.
- the content of free acid can be measured by the method prescribed in ASTM D817-96.
- Cellulose derivatives may contain trace amounts of metal components. It is thought that a trace amount metal component originates in the water used in the synthesis process of the cellulose derivative. Like these metal components, the content of components that can become insoluble nuclei is preferably as small as possible.
- metal ions such as iron, calcium, and magnesium may form an insoluble matter by forming a salt with a resin decomposition product or the like that may contain an organic acidic group.
- the calcium (Ca) component easily forms a coordination compound (that is, a complex) with an acidic component such as a carboxylic acid or a sulfonic acid, and many ligands. There is a risk of forming an insoluble starch or turbidity.
- the content of the iron (Fe) component in the cellulose derivative is preferably 1 mass ppm or less.
- the content of the calcium (Ca) component in the cellulose derivative is preferably 60 ppm by mass or less, more preferably 0 to 30 ppm by mass.
- the content of the magnesium (Mg) component in the cellulose derivative is preferably 0 to 70 ppm by mass, particularly preferably 0 to 20 ppm by mass.
- the content of metal components such as iron (Fe) component, calcium (Ca) component, and magnesium (Mg) component is pre-processed by completely digesting cellulose derivatives with micro digest wet decomposition equipment (sulfur nitrate decomposition) and alkali melting. After the measurement, it can be measured using ICP-AES (Inductively Coupled Plasma Atomic Emission Spectrometer).
- the content of residual alkaline earth metal, residual sulfuric acid and residual acid can be adjusted by thoroughly washing the cellulose derivative obtained by synthesis.
- the cellulose derivative can be produced by a known method. Specifically, for example, it can be synthesized with reference to the method described in JP-A-10-45804.
- the cellulose as a raw material for the cellulose derivative is not particularly limited, and may be cotton linter, wood pulp, kenaf, and the like. You may mix and use the cellulose derivative from which a raw material differs.
- the (meth) acrylic resin may be a homopolymer of (meth) acrylic acid ester or a copolymer of (meth) acrylic acid ester and another copolymerizable monomer.
- the (meth) acrylic acid ester is preferably methyl methacrylate.
- the content ratio of the structural unit derived from methyl methacrylate in the copolymer is preferably 50% by mass or more, and more preferably 70% by mass or more.
- copolymer monomers in the copolymer of methyl methacrylate and other copolymer monomers include alkyl methacrylates having 2 to 18 carbon atoms in the alkyl moiety; alkyl acrylates having 1 to 18 carbon atoms in the alkyl moiety; An alkyl (meth) acrylate having 1 to 18 carbon atoms in the alkyl moiety having a hydroxyl group, which can form a lactone ring structure described below; an ⁇ , ⁇ -unsaturated acid such as acrylic acid or methacrylic acid; maleic acid, fumaric acid, Unsaturated divalent carboxylic acids such as itaconic acid; aromatic vinyl compounds such as styrene and ⁇ -methylstyrene; ⁇ , ⁇ -unsaturated nitriles such as acrylonitrile and methacrylonitrile; maleic anhydride, maleimide, N-substituted Acrylic amides such as maleimide, glutaric an
- alkyl acrylates such as methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, s-butyl acrylate, 2-ethylhexyl acrylate, etc. are used to increase the thermal decomposition resistance and fluidity of the copolymer; 2 Alkyl (meth) acrylates having a hydroxyl group such as methyl (hydroxymethyl) acrylate and ethyl 2- (hydroxymethyl) acrylate are preferred. In order to enhance the compatibility with the cellulose ester, acryloylmorpholine and the like are preferable.
- the (meth) acrylic resin preferably contains a lactone ring structure from the viewpoint of enhancing the heat resistance of the resulting optical film or adjusting the photoelastic coefficient.
- the lactone ring structure contained in the (meth) acrylic resin is preferably represented by the following general formula (1).
- R 1 to R 3 each independently represent a hydrogen atom or an organic residue having 1 to 20 carbon atoms.
- the organic residue may contain an oxygen atom.
- Examples of organic residues include linear or branched alkyl groups, linear or branched alkylene groups, aryl groups, —OAc groups (Ac is an acetyl group), —CN groups, and the like.
- the lactone ring structure represented by the formula (1) is a structure derived from an alkyl (meth) acrylate having a hydroxyl group, as will be described later.
- the (meth) acrylic resin containing a lactone ring structure further includes a structural unit derived from an alkyl (meth) acrylate having 1 to 18 carbon atoms in the alkyl portion, and if necessary, a monomer containing a hydroxyl group, an unsaturated carboxylic acid
- a structural unit derived from an acid, a monomer represented by the general formula (2), or the like may be further included.
- R 4 in the general formula (2) represents a hydrogen atom or a methyl group.
- X is a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an aryl group, —OAc group (Ac: acetyl group), —CN group, acyl group, or —C—OR group (R is a hydrogen atom or 1 to 20 organic residues).
- the content ratio of the lactone ring structure represented by the formula (1) in the (meth) acrylic resin containing a lactone ring structure is preferably 5 to 90% by mass, more preferably 10 to 80% by mass, More preferably, it is 15 to 70% by mass.
- the content of the lactone ring structure is more than 90% by mass, the molding processability is low, and the flexibility of the obtained film tends to be low.
- the content of the lactone ring structure is less than 5% by mass, it is difficult to obtain a film having a necessary retardation, and heat resistance, solvent resistance, and surface hardness may not be sufficient.
- the content of the structural unit derived from the alkyl (meth) acrylate is preferably 10 to 95% by mass, more preferably 20 to 90% by mass, Preferably, the content is 30 to 85% by mass.
- the content ratio of the structural unit derived from the hydroxyl group-containing monomer, the unsaturated carboxylic acid, or the monomer represented by the general formula (2) is preferably independently from 0 to 30. % By mass, more preferably 0 to 20% by mass, and still more preferably 0 to 10% by mass.
- the (meth) acrylic resin containing a lactone ring structure is obtained by polymerizing a monomer component containing at least an alkyl (meth) acrylate having a hydroxyl group and another alkyl (meth) acrylate to form a hydroxyl group in the molecular chain. It can be produced through a step of obtaining a polymer having an ester group; a step of introducing a lactone ring structure by heat-treating the obtained polymer.
- the weight average molecular weight Mw of the (meth) acrylic resin is preferably in the range of 8.0 ⁇ 10 4 to 5.0 ⁇ 10 5 , more preferably 9.0 ⁇ 10 4 to 4.5 ⁇ 10 5 . Within the range, more preferably within the range of 1.0 ⁇ 10 5 to 4.0 ⁇ 10 5 . If the weight average molecular weight Mw of the (meth) acrylic resin is less than 8.0 ⁇ 10 4 , the resulting film tends to be brittle, and if it exceeds 5.0 ⁇ 10 5 , the resulting film has a high haze. Prone.
- the weight average molecular weight Mw of the (meth) acrylic resin can be measured by gel permeation chromatography.
- the measurement conditions are as follows. Solvent: Methylene chloride Column: Shodex K806, K805, K803G (Used by connecting three products manufactured by Showa Denko KK) Column temperature: 25 ° C Sample concentration: 0.1% by mass Detector: RI Model 504 (manufactured by GL Sciences) Pump: L6000 (manufactured by Hitachi, Ltd.) Flow rate: 1.0ml / min
- (Meth) acrylic resin may be one kind or a mixture of two or more kinds.
- the thermoplastic resin may be one type or a mixture of two or more types.
- two or more types of mixtures include mixtures of cellulose derivatives and other resins;
- other resins include vinyl resins (including polyvinyl acetate resins, polyvinyl alcohol resins, etc.), Examples thereof include cyclic olefin resins, polyester resins (aromatic polyesters, aliphatic polyesters, or copolymers containing them) and (meth) acrylic resins (including copolymers).
- the content of the other resin in the mixture of the cellulose derivative and the other resin is preferably about 5 to 70% by mass with respect to the entire mixture.
- the present inventors show that a compound having an aspect ratio in a specific range and a specific maximum absorption in a solution absorption spectrum exhibits high retardation and sufficient reverse wavelength dispersion characteristics. I found out.
- the compound used in the present invention is characterized by satisfying all of the following (1) to (5).
- the solution absorption spectrum has at least two maximum absorptions in the wavelength region of 200 nm to 350 nm.
- the wavelength of the first maximum absorption among the two maximum absorptions in the wavelength region of 200 nm to 350 nm is ⁇ max1. ( ⁇ max1- ⁇ max2) is 20 nm or more, where ⁇ max2 is the wavelength of the second maximum absorption that is shorter than the first maximum absorption wavelength.
- the aspect ratio of the molecule is 1.70 or more.
- thermoplastic resin having at least one non-aromatic hydrocarbon ring, aromatic heterocycle or non-aromatic heterocycle in the molecule (5) film in which 1% by mass of the compound is added to the thermoplastic resin
- the in-plane retardation increase sensitivity is 0.1 or more.
- the compound used in the present invention exhibits at least two maximums in a wavelength region of 200 nm or more and 350 nm or less in a solution absorption spectrum in order to develop a high retardation even when the film thickness is small and to obtain good wavelength dispersion.
- the two maximum absorptions are more than a certain distance; specifically, the wavelength of the first maximum absorption on the long wavelength side is ⁇ max1, and the first absorption on the short wavelength side is When the wavelength of the second maximum absorption is ⁇ max2, ( ⁇ max1 ⁇ max2) is characterized by being 20 nm or more, and more preferably 50 nm or more.
- the second maximum absorption when three or more maximum absorptions are confirmed in a wavelength region of 200 nm or more and 350 nm or less, two maximum absorptions having the longest wavelength among them are selected; The maximum absorption on the short wavelength side is referred to as the “second maximum absorption”.
- the absorption wavelength having the highest absorbance among them is regarded as the maximum absorption, and the other absorptions are not regarded as the maximum absorption. .
- FIG. 1 is a graph showing an example of a solution absorption spectrum of a compound used in the present invention and a conventionally used compound.
- FIG. 1 (A) is a graph showing the solution absorption spectrum of compounds A-41 and A-62 (both described in specific examples described later) used in the present invention
- FIG. 1 (B) These are the graphs which show the solution absorption spectrum of the comparative compound b and the comparative compound a (both used in the comparative example mentioned later) used conventionally.
- conventionally used comparative compound b and comparative compound a have only one maximum absorption wavelength in a wavelength region of 200 nm to 350 nm. For this reason, it is considered that the retardation development property and the wavelength dispersion property cannot be compatible.
- compounds A-41 and A-62 used in the present invention have a first maximum absorption on the long wavelength side in the wavelength region of 200 nm to 350 nm. And a second maximum absorption on the short wavelength side; the first maximum absorption and the second maximum absorption are separated by a certain distance or more. Therefore, it is considered that the phase difference development property and the wavelength dispersion characteristic can be compatible without canceling each other (without being a trade-off).
- the absorbance ratio Abs1 / Abs2 is preferably 0.08 to 20.
- Abs1 / Abs2 is less than 0.08, the obtained film may not exhibit sufficient reverse wavelength dispersion.
- Abs1 / Abs2 is more than 20, the retardation of the compound may not be sufficiently exhibited.
- the absorbance ratio Abs1 / Abs2 is more preferably 0.10 to 10.
- the compound used in the present invention may have a maximum absorption also in a region of 351 nm or more.
- the absorbance Abs3 at the wavelength ⁇ max3 of the maximum absorption of 351 nm or more is preferably smaller than Abs1 and Abs2, and more preferably not having the maximum absorption in the region of 351 nm or more. .
- the solution absorption spectrum can be obtained by measuring a solution obtained by dissolving the compound used in the present invention in a solvent with a spectrophotometer.
- the solvent may be any solvent that can dissolve the compound used in the present invention, and specific examples thereof include acetone, acetonitrile, tetrahydrofuran, ethyl acetate, methylene chloride, methanol, ethanol, propanol and the like.
- concentration of the compound used in the present invention in the solution is not particularly limited, but can be preferably about 10 ⁇ 8 to 10 ⁇ 3 mol / L.
- a commercially available spectrometer can be used for the spectrophotometer.
- the compound used in the present invention has a molecular aspect ratio of 1.70 or more.
- a compound having an aspect ratio of 1.70 or more it becomes anisotropic to the resin, and it is easy to obtain the effect of increasing the reverse wavelength dispersion, and a sufficiently high retardation even when the film thickness is thin. Expression can be achieved.
- the aspect ratio of the molecule is less than 1.70, a phase difference may be exhibited, but it is difficult to obtain the effect of increasing the reverse wavelength dispersion. This is presumed that since the molecular shape is close to a disk shape, it is isotropic with respect to the resin, and it is difficult to obtain the effect of increasing the reverse wavelength dispersion.
- the aspect ratio is preferably 10 or less. If the aspect ratio is too high, the solvent solubility becomes poor, causing problems in handling during production.
- the aspect ratio is more preferably 5 or less.
- the aspect ratio of the compound can be obtained by calculation using Winmostar® MOPAC® AM1 (MOP6W70) (Senda, “Development of molecular calculation support system Winmostar”, Idemitsu Technical Report, 49, 1, 106-111 (2006)).
- the compound used in the present invention has an in-plane retardation increasing sensitivity of 0.1 or more, and more preferably 0.12 or more.
- “In-plane retardation increase sensitivity” refers to a retardation in the in-plane direction with respect to the stretching ratio when a film obtained by adding 1% by mass of the compound used in the present invention to a thermoplastic resin is stretched under predetermined conditions. Indicates the rate of increase.
- the in-plane retardation increase sensitivity of the compound is less than 0.10, it is necessary to increase the content of the compound in the film or increase the thickness of the film in order to develop a predetermined retardation. If the content of the compound in the film is too high, the film tends to bleed out or increase in haze; if the thickness of the film is too large, it is easily affected by the retardation value in the thickness direction. The color change in the oblique direction of the apparatus occurs, and the visibility in the oblique direction tends to be lowered.
- the measurement of the in-plane retardation increase sensitivity can be performed by the following procedure. 1) A film having a thickness of 60 ⁇ m containing a thermoplastic resin and 1% by mass of the compound used in the present invention is produced, and the obtained film is cut into a 50 mm square to obtain a sample film. From the center of the sample film, two points of 15 mm in the vertical direction and two points of 15 mm in the horizontal direction are used as measurement points. Then, the distance (X0) between the measurement points in the vertical direction before stretching, the distance (Y0) between the measurement points in the horizontal direction, and the phase difference R 0 in the in-plane direction at a wavelength of 550 nm at the center surrounded by the measurement points. A0 (550) is measured.
- the sample film is stretched uniaxially in the transverse direction at a set magnification of 100% (stretching ratio: 2.0 times) at a temperature of glass transition temperature (Tg) of the film + 25 ° C.
- Tg glass transition temperature
- R 0 A1 (550) ⁇ R 0 A0 (550)) is calculated. Then, ⁇ R 0 A obtained is divided by the actual draw ratio to calculate the in-plane retardation sensitivity A of the film.
- A ⁇ R 0 A / actual draw ratio (%)
- a film having a thickness of 60 ⁇ m made of a thermoplastic resin is produced in the same manner as 1) above except that the compound used in the present invention is not contained; the obtained film is cut into a 50 mm square to obtain a blank film.
- the in-plane retardation sensitivity B of this blank film is measured in the same manner as described above.
- In-plane retardation increase sensitivity (In-plane retardation sensitivity A of sample film) ⁇ (In-plane retardation sensitivity B of blank film)
- the glass transition temperature (Tg) of the film is determined by differential scanning using a commercially available apparatus such as a DSC-7 differential scanning calorimeter (Perkin Elmer) or a TAC7 / DX thermal analyzer controller (Perkin Elmer). It can be measured by a calorimetric analysis method.
- the compound used in the present invention is characterized by having at least one non-aromatic hydrocarbon ring, aromatic heterocycle or non-aromatic heterocycle in the molecule.
- non-aromatic hydrocarbon rings examples include cyclopropane ring, cyclobutane ring, cyclopentane ring, cyclohexane ring, cycloheptane ring, cyclooctane ring, cyclobutene ring, cyclopentene ring, cyclohexene ring, cycloheptene ring, or cyclooctene ring, Examples include an adamantane ring, a bicyclononane ring, a norbornane ring, a norbornene ring, a dicyclopentadiene ring, a hydrogenated naphthalene ring, and a hydrogenated biphenyl ring. Of these, a cyclopentane ring, a cyclohexane ring, a cycloheptane ring, a cyclonorbornene ring, and the like are preferable.
- aromatic heterocycle examples include furan ring, benzofuran ring, thiophene ring, benzothiophene ring, pyrrole ring, pyrazole ring, imidazole ring, oxadiazole ring, indole ring, carbazole ring, azacarbazole ring (azacarbazole ring group) Represents one or more carbon atoms constituting the carbazole ring group replaced by a nitrogen atom), triazole ring, pyrroloimidazole ring, pyrrolopyrazole ring, pyrrolopyrrole ring, thienopyrrole ring, thienothiophene ring, fluropyrrole ring, Furofuran ring, thienofuran ring, benzisoxazole ring, benzisothiazole ring, benzimidazole ring, pyridine ring, pyrazine ring, pyridazin
- non-aromatic heterocycles include tetrahydrofuran ring, tetrahydropyran ring, dioxolane ring, dioxane ring, pyrrolidine ring, pyridone ring, pyridazinone ring, imide ring, piperidine ring, dihydropyrrole ring, dihydropyridine ring, tetrahydropyridine ring, piperazine Ring, morpholine ring, dihydrooxazole ring, dihydrothiazole ring, piperidine ring, aziridine ring, azetidine ring, azepine ring, azepan ring, imidazolidine ring, diazepine ring and tetrahydrothiophene ring.
- a pyridone ring, an imide ring, and a pyrrolidine ring are preferable.
- thermoplastic resin Since a compound having an aromatic heterocycle or a non-aromatic heterocycle in the molecule contains a heteroatom of the heterocycle, the compatibility with the thermoplastic resin is enhanced. Thereby, it is easy to interact with a thermoplastic resin, and it is easy to express a higher phase difference.
- a non-aromatic heterocyclic ring since a non-aromatic heterocyclic ring has a molecular structure with higher flexibility than an aromatic heterocyclic ring, it is more likely to interact with a thermoplastic resin than an aromatic heterocyclic ring, and a higher phase difference is likely to be exhibited.
- a compound consisting only of a chain structure containing a heteroatom has too high molecular flexibility, the molecular motion becomes active when the optical film is heated and stretched, and it is fixed without being oriented (randomly) when cooled. Therefore, it is difficult to interact with the thermoplastic resin, and it is difficult to develop a phase difference.
- the ring structure of the non-aromatic hydrocarbon ring is not fixed, the structure can be flexibly changed according to the molecular structure of the thermoplastic resin.
- the non-aromatic hydrocarbon ring does not have flexibility as much as a chain structure, it easily interacts with the thermoplastic resin and easily develops a high phase difference.
- the compound used in the present invention particularly preferably contains one or more non-aromatic rings (non-aromatic hydrocarbon ring or non-aromatic heterocyclic ring) in the molecule.
- the compound used in the present invention is preferably a compound represented by the following general formula (A).
- Q in the general formula (A) represents an aromatic hydrocarbon ring, a non-aromatic hydrocarbon ring, an aromatic heterocycle, or a non-aromatic heterocycle.
- the aromatic hydrocarbon ring may be a single ring or a condensed ring, but is preferably a single ring.
- Preferred examples of the aromatic hydrocarbon ring include benzene ring, naphthalene ring, anthracene ring, phenanthrene ring, perylene ring, tetracene ring, pyrene ring, benzopyrene ring, chrysene ring, triphenylene ring, acenaphthene ring, fluoranthene ring, fluorene ring, etc. More preferably, it is a benzene ring.
- Non-aromatic hydrocarbon rings are as defined above, but preferred examples include cyclopropane rings, cyclobutane rings, cyclopentane rings, cyclohexane rings, cycloheptane rings, cyclooctane rings, norbornene rings, and more.
- a cyclohexane ring and a cyclopentane ring are preferable.
- the aromatic heterocyclic ring has the same meaning as described above, and may be a monocyclic ring or a condensed ring, and is preferably a monocyclic ring.
- Preferred examples of the aromatic heterocycle include furan ring, benzofuran ring, thiophene ring, benzothiophene ring, pyrrole ring, pyrazole ring, imidazole ring, oxadiazole ring, indole ring, carbazole ring, triazole ring, benzimidazole ring, Pyridine ring, pyrazine ring, pyridazine ring, pyrimidine ring, triazine ring, quinoline ring, benzimidazole ring, perimidine ring, quinazoline ring, azulene ring, dibenzofuran ring, dibenzothiophene ring, dibenzocarbazole ring, benzodifuran ring,
- Non-aromatic heterocycle is as defined above, and preferred examples thereof include tetrahydrofuran ring, tetrahydropyran ring, dioxolane ring, dioxane ring, pyrrolidine ring, pyridone ring, pyridazinone ring, imide ring, piperidine ring, dihydropyrrole.
- W a and W b in the general formula (A) are each a hydrogen atom or a substituent bonded to an atom (ring atom) constituting the ring of Q; the ring atom to which W a is bonded; and W b is The ring atoms to be bonded are adjacent to each other. W a and W b are different from each other.
- the substituents represented by W a and W b mainly have a function of imparting reverse wavelength dispersibility to the compound, and specifically, preferably have a structure that produces maximum absorption on the long wavelength side.
- W a and W b are preferably bonded to each other to form a ring; or at least one of W a and W b preferably has a ring structure.
- substituents represented by W a or W b include Halogen atom (fluorine atom, chlorine atom, bromine atom, iodine atom, etc.), Alkyl group (methyl group, ethyl group, n-propyl group, isopropyl group, tert-butyl group, n-octyl group, 2-ethylhexyl group, etc.), A cycloalkyl group (a cyclohexyl group, a cyclopentyl group, a 4-n-dodecylcyclohexyl group, etc.), Alkenyl group (vinyl group, allyl group, etc.), Cycloalkenyl groups (2-cyclopenten-1-yl, 2-cyclohexen-1-yl group, etc.), alkynyl groups (ethynyl group, propargyl group, etc.), Aryl group (phenyl group, p-tolyl group, naphthy
- W a and W b are bonded to each other to form a ring, or W a is a hydrogen atom, and W b is an aromatic hydrocarbon ring, a non-aromatic hydrocarbon ring, an aromatic heterocycle or a non-ring.
- An aromatic heterocyclic ring is preferable, and an aromatic heterocyclic ring is more preferable.
- the ring formed by combining W a and W b with each other is preferably an aromatic heterocyclic ring, more preferably a nitrogen-containing heterocyclic ring, as will be described later.
- R 3 in the general formula (A) represents an arbitrary substituent and may or may not be present.
- substituents are not particularly limited, Halogen atom (fluorine atom, chlorine atom, bromine atom, iodine atom, etc.), Alkyl group (methyl group, ethyl group, n-propyl group, isopropyl group, tert-butyl group, n-octyl group, 2-ethylhexyl group, etc.), Alkenyl group (vinyl group, allyl group, etc.), Alkynyl group (ethynyl group, propargyl group, etc.), Cyano group, hydroxyl group, nitro group, carboxyl group, Alkoxy groups (methoxy group, ethoxy group, isopropoxy group, tert-butoxy group, n-octyloxy group, 2-methoxyethoxy group, etc.), Acyloxy groups (formyloxy group,
- R 3 represents a hydrogen atom, a halogen atom, an alkyl group (preferably having 1 to 20 carbon atoms), an alkenyl group (preferably having 3 to 20 carbon atoms), an aryl group (preferably having 6 to 20 carbon atoms), a hetero group.
- Aryl group preferably 4 to 20 carbon atoms), hydroxyl group, carboxyl group, alkoxy group (preferably 1 to 20 carbon atoms), aryloxy group (preferably 6 to 20 carbon atoms), acyl group, acyloxy group, cyano Group and amino group are preferable; a hydrogen atom, a halogen atom, an alkyl group, a cyano group and an alkoxy group are more preferable.
- substituents may further have the same substituent.
- M in the general formula (A) is the number of substituents represented by R 3 ; an integer of 0 to 2, preferably 0.
- R 3 may be the same as or different from each other.
- n is an integer of 1 to 10, preferably 1.
- a plurality of Q, L 2 , W a , W b , R 3 , and m may be the same as or different from each other.
- L 1 and L 2 in the general formula (A) are each independently a single bond or an alkylene group, an alkenylene group, an alkynylene group, —O—, — (C ⁇ O) —, — (C ⁇ O) —O—. , —NR L —, —S—, — (O ⁇ S ⁇ O) — and — (C ⁇ O) —NR L —, or a combination thereof; —O—, — (C ⁇ O) —O—, —O— (C ⁇ O) —, — (C ⁇ O) —NH—, —NH— (C ⁇ O) —.
- R L represents a hydrogen atom or a substituent.
- substituent represented by R L include an alkyl group (methyl group, ethyl group, n-propyl group, isopropyl group, tert-butyl group, n-octyl group, 2-ethylhexyl group, etc.), cycloalkyl group ( Cyclohexyl group, cyclopentyl group, 4-n-dodecylcyclohexyl group, etc.), aryl group (phenyl group, p-tolyl group, naphthyl group, etc.), heteroaryl group (2-furyl group, 2-thienyl group, 2-pyrimidinyl group) , 2-benzothiazolyl group, 2-pyridyl group and the like), cyano group and the like.
- R 1 and R 2 in formula (A) each independently represent a substituent.
- R 1 and R 2 may be the same or different from each other.
- substituents represented by R 1 and R 2 include Halogen atom (fluorine atom, chlorine atom, bromine atom, iodine atom, etc.), Alkyl group (methyl group, ethyl group, n-propyl group, isopropyl group, tert-butyl group, n-octyl group, 2-ethylhexyl group, etc.), A cycloalkyl group (a cyclohexyl group, a cyclopentyl group, a 4-n-dodecylcyclohexyl group, etc.), Alkenyl group (vinyl group, allyl group, etc.), Cycloalkenyl groups (2-cyclopenten-1-yl, 2-cyclohexen-1-yl group, etc.), Alkynyl group (ethy
- R 1 and R 2 are an alkyl group (preferably an alkyl group having 1 to 20 carbon atoms), a cycloalkyl group (preferably a cycloalkyl group having 3 to 20 carbon atoms), an aryl group (preferably a carbon number of 6 Is preferably an aryl group having 20 to 20 carbon atoms, a heteroaryl group (preferably an aryl group having 4 to 20 carbon atoms), and more preferably an aryl group or a cycloalkyl group.
- the aryl group is preferably a substituted or unsubstituted phenyl group, more preferably a phenyl group having a substituent, and still more preferably a phenyl group having a substituent at the 4-position.
- the cycloalkyl group is preferably a substituted or unsubstituted cyclohexyl group, more preferably a cyclohexyl group having a substituent, and further preferably a cyclohexyl group having a substituent at the 4-position.
- the substituent represented by R 1 or R 2 may further have the same substituent.
- the compound represented by the general formula (A) is preferably a compound represented by the general formula (B).
- W a , W b , R 3 , m, L 1 , L 2 , R L , R 1 and R 2 in the general formula (B) are the same as W a , W b , R 3 , m, Defined similarly to L 1 , L 2 , R L , R 1 and R 2 , respectively.
- the compound represented by the general formula (B) is preferably a compound represented by the general formula (1B).
- W a , W b , R 3 , m, L 1 , L 2 , R L , R 1 and R 2 in general formula (1B) are the same as W a , W b , R 3 , m, Defined similarly to L 1 , L 2 , R L , R 1 and R 2 , respectively.
- W a and W b in the general formula (1B) may be bonded to each other to form a ring.
- the ring formed by combining W a and W b is preferably a nitrogen-containing heterocycle.
- Examples of the compound represented by the general formula (1B) include the following.
- Q in the general formula (A) is a benzene ring; W a is a group containing an oxygen atom bonded to the benzene ring; W b is bonded to the benzene ring.
- Q in the general formula (A) is a naphthalene ring.
- the compound represented by the general formula (B) is more preferably a compound represented by the general formula (2B).
- W 1 in the general formula (2B) represents a cyclic group.
- Atom bonded to the benzene ring among ring-constituting atoms of W 1 is preferably a carbon atom or a nitrogen atom.
- the cyclic group represented by W 1 is not particularly limited as long as it is an arbitrary cyclic group. Specific examples include a pyrrole ring, a furyl ring, a thiophene ring, an imidazole ring, an oxazole ring, a thiazole ring, a benzimidazole ring, and a benzoxazole.
- Residues of aromatic heterocyclic rings such as rings, benzothiazole rings, benzoxazinone rings and pyridyl rings; Residues of aromatic hydrocarbon rings such as benzene rings and naphthalene rings; Non-residues such as pyridone rings, pyridazinone rings and imide rings It may be a residue of an aromatic heterocyclic ring; or a residue of a non-aromatic hydrocarbon ring such as a cyclohexane ring or a cyclopentane ring.
- R 3 m, L 1, L 2, R L, R 1 and R 2 in the general formula (2B) is, R 3 in the general formula (A), m, L 1 , L 2, R L, R 1 and Each of R 2 is defined similarly.
- Examples of the compound represented by the general formula (2B) include the following.
- the compound represented by the general formula (A) can be synthesized by a known method. Specifically, it can be synthesized with reference to JP-A-2008-107767.
- the content of the compound used in the present invention is appropriately set to such an extent that the required wavelength dispersion adjusting ability and phase difference developability can be imparted.
- the content of the compound used in the present invention is preferably 1 to 15% by mass and more preferably 2 to 10% by mass with respect to the thermoplastic resin. If the content of the compound is less than 1% by mass, it is difficult to obtain desired retardation development and wavelength dispersion adjusting function, and if it exceeds 15% by mass, the optical film tends to bleed out. If the content of the compound is within the above range, sufficient optical wavelength dispersibility and high retardation development property can be imparted to the optical film of the present invention.
- the optical film of the present invention may further contain various additives as necessary.
- sugar ester compound is a compound having 1 to 12 furanose structures or pyranose structures, in which all or part of the hydroxyl groups in the compound are esterified.
- sugar ester compounds include sucrose ester compounds represented by the following general formula (3).
- R 1 to R 8 in the formula (3) represent a substituted or unsubstituted alkylcarbonyl group or a substituted or unsubstituted arylcarbonyl group.
- R 1 to R 8 may be the same as or different from each other.
- the substituted or unsubstituted alkylcarbonyl group is preferably a substituted or unsubstituted alkylcarbonyl group having 2 or more carbon atoms.
- Examples of the substituted or unsubstituted alkylcarbonyl group include a methylcarbonyl group (acetyl group).
- the substituted or unsubstituted arylcarbonyl group is preferably a substituted or unsubstituted arylcarbonyl group having 7 or more carbon atoms.
- the arylcarbonyl group include a phenylcarbonyl group.
- the substituent that the aryl group has include an alkyl group such as a methyl group and an alkoxyl group such as a methoxy group.
- the average ester substitution degree of the sucrose ester compound is preferably 3.0 to 7.5. If the average ester substitution degree is less than 3.0 or more than 7.5, it is difficult to obtain sufficient compatibility with the cellulose ester.
- sucrose ester compound represented by the general formula (3) include the following.
- R in the table represents R 1 to R 8 in the general formula (3).
- sugar ester compound examples include compounds described in JP-A Nos. 62-42996 and 10-237084.
- the content of the sugar ester compound is preferably 0.5 to 35% by mass, and more preferably 5 to 30% by mass with respect to the thermoplastic resin.
- the optical film of the present invention may contain a plasticizer in order to improve the fluidity of the composition during film production and the flexibility of the film.
- plasticizers include polyester plasticizers, polyhydric alcohol ester plasticizers, polycarboxylic acid ester plasticizers (including phthalate ester plasticizers), glycolate plasticizers, ester plasticizers ( Citrate ester plasticizers, fatty acid ester plasticizers, phosphate ester plasticizers, trimellitic ester plasticizers, etc.). These may be used alone or in combination of two or more.
- the polyester plasticizer is a compound obtained by reacting a monovalent to tetravalent carboxylic acid and a monovalent to hexavalent alcohol, preferably a compound obtained by reacting a divalent carboxylic acid and a glycol. It is.
- divalent carboxylic acids examples include glutaric acid, itaconic acid, adipic acid, phthalic acid, azelaic acid, sebacic acid and the like.
- a compound using adipic acid, phthalic acid or the like as a divalent carboxylic acid can impart good plasticity.
- glycols examples include ethylene glycol, propylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, 1,6-hexamethylene glycol, neopentylene glycol, diethylene glycol, triethylene glycol, dipropylene glycol and the like. included.
- One type of divalent carboxylic acid and glycol may be used, respectively, or two or more types may be used in combination.
- the polyester plasticizer may be any of ester, oligoester and polyester.
- the molecular weight of the polyester plasticizer is preferably in the range of 100 to 10,000, and more preferably in the range of 600 to 3,000 because the effect of imparting plasticity is great.
- the viscosity of the polyester plasticizer depends on the molecular structure and molecular weight, but in the case of an adipic acid plasticizer, it has a high compatibility with a thermoplastic resin and a high effect of imparting plasticity. -It is preferable that it is the range of s (25 degreeC).
- One type of polyester plasticizer may be used, or two or more types may be used in combination.
- the polyhydric alcohol ester plasticizer is an ester compound (alcohol ester) of a dihydric or higher aliphatic polyhydric alcohol and a monocarboxylic acid, preferably a divalent to 20-valent aliphatic polyhydric alcohol ester.
- the polyhydric alcohol ester compound preferably has an aromatic ring or a cycloalkyl ring in the molecule.
- aliphatic polyhydric alcohol examples include ethylene glycol, propylene glycol, trimethylolpropane, pentaerythritol and the like.
- the monocarboxylic acid can be an aliphatic monocarboxylic acid, an alicyclic monocarboxylic acid, an aromatic monocarboxylic acid, or the like.
- One kind of monocarboxylic acid may be used, or a mixture of two or more kinds may be used.
- all of the OH groups contained in the aliphatic polyhydric alcohol may be esterified, or a part of the OH groups may be left as they are.
- the aliphatic monocarboxylic acid is preferably a fatty acid having a straight chain or a side chain having 1 to 32 carbon atoms.
- the number of carbon atoms of the aliphatic monocarboxylic acid is more preferably 1-20, and still more preferably 1-10.
- Examples of such aliphatic monocarboxylic acids include acetic acid, propionic acid, butyric acid, valeric acid, and the like, and acetic acid may be preferable in order to enhance compatibility with the cellulose ester.
- Examples of the alicyclic monocarboxylic acid include cyclopentane carboxylic acid, cyclohexane carboxylic acid, cyclooctane carboxylic acid and the like.
- aromatic monocarboxylic acids examples include benzoic acid; one having 1 to 3 alkyl groups or alkoxy groups (for example, methoxy group or ethoxy group) introduced into the benzene ring of benzoic acid (for example, toluic acid); benzene ring Aromatic monocarboxylic acids having two or more (for example, biphenyl carboxylic acid, naphthalene carboxylic acid, tetralin carboxylic acid, etc.) are included, and benzoic acid is preferred.
- the molecular weight of the polyhydric alcohol ester plasticizer is not particularly limited, but is preferably 300 to 1500, and more preferably 350 to 750. In order to make it difficult to volatilize, a higher molecular weight is preferable; in order to improve moisture permeability and compatibility with cellulose ester, a lower molecular weight is preferable.
- polyhydric alcohol ester plasticizer examples include trimethylolpropane triacetate, pentaerythritol tetraacetate, ester compound (A) represented by the general formula (I) described in JP-A-2008-88292, and the like. It is.
- the polyvalent carboxylic acid ester plasticizer is an ester compound of a divalent or higher, preferably 2 to 20 valent polycarboxylic acid and an alcohol compound.
- the polyvalent carboxylic acid is preferably a divalent to 20-valent aliphatic polyvalent carboxylic acid, a 3- to 20-valent aromatic polyvalent carboxylic acid, or a 3- to 20-valent alicyclic polyvalent carboxylic acid. .
- polyvalent carboxylic acids include trivalent or higher aromatic polyvalent carboxylic acids such as trimellitic acid, trimesic acid, pyromellitic acid or derivatives thereof; succinic acid, adipic acid, azelaic acid, sebacic acid, oxalic acid Contains aliphatic polycarboxylic acids such as fumaric acid, maleic acid and tetrahydrophthalic acid; oxypolycarboxylic acids such as tartaric acid, tartronic acid, malic acid and citric acid, etc. For this, oxypolycarboxylic acids are preferred.
- the alcohol compound examples include an aliphatic saturated alcohol compound having a straight chain or a side chain, an aliphatic unsaturated alcohol compound having a straight chain or a side chain, an alicyclic alcohol compound, or an aromatic alcohol compound.
- the carbon number of the aliphatic saturated alcohol compound or the aliphatic unsaturated alcohol compound is preferably 1 to 32, more preferably 1 to 20, and still more preferably 1 to 10.
- Examples of the alicyclic alcohol compound include cyclopentanol, cyclohexanol and the like.
- the aromatic alcohol compound include phenol, paracresol, dimethylphenol, benzyl alcohol, cinnamyl alcohol and the like.
- the alcohol compound may be one kind or a mixture of two or more kinds.
- the molecular weight of the polyvalent carboxylic acid ester plasticizer is not particularly limited, but is preferably 300 to 1000, and more preferably 350 to 750.
- the molecular weight of the polyvalent carboxylic acid ester plasticizer is preferably larger from the viewpoint of suppressing bleed-out; it is preferably smaller from the viewpoint of moisture permeability and compatibility with the cellulose ester.
- the acid value of the polyvalent carboxylic acid ester plasticizer is preferably 1 mgKOH / g or less, more preferably 0.2 mgKOH / g or less.
- the acid value means the number of milligrams of potassium hydroxide necessary for neutralizing the acid (carboxyl group present in the sample) contained in 1 g of the sample.
- the acid value is measured according to JIS K0070.
- Examples of the polyvalent carboxylic ester plasticizer include an ester compound (B) represented by the general formula (II) described in JP-A-2008-88292.
- the polycarboxylic acid ester plasticizer may be a phthalate ester plasticizer.
- the phthalate ester plasticizer include diethyl phthalate, dimethoxyethyl phthalate, dimethyl phthalate, dioctyl phthalate, dibutyl phthalate, di-2-ethylhexyl phthalate, dioctyl phthalate, dicyclohexyl phthalate, dicyclohexyl terephthalate and the like.
- glycolate plasticizers include alkylphthalyl alkyl glycolates.
- alkyl phthalyl alkyl glycolates include methyl phthalyl methyl glycolate, ethyl phthalyl ethyl glycolate, propyl phthalyl propyl glycolate, butyl phthalyl butyl glycolate, octyl phthalyl octyl glycolate, etc. .
- the ester plasticizer includes a fatty acid ester plasticizer, a citrate ester plasticizer, a phosphate ester plasticizer, a trimellitic acid plasticizer, and the like.
- fatty acid ester plasticizers include butyl oleate, methylacetyl ricinoleate, and dibutyl sebacate.
- citrate plasticizer include acetyltrimethyl citrate, acetyltriethyl citrate, and acetyltributyl citrate.
- phosphate ester plasticizer include triphenyl phosphate, tricresyl phosphate, cresyl diphenyl phosphate, octyl diphenyl phosphate, diphenyl biphenyl phosphate, trioctyl phosphate, tributyl phosphate, and the like.
- trimellitic acid plasticizers include octyl trimellitic acid, n-octyl trimellitic acid, isodecyl trimellitic acid, and isononyl trimellitic acid.
- the content of the plasticizer is preferably 0.5 to 30% by mass with respect to the thermoplastic resin. If the plasticizer content exceeds 30% by mass, the film tends to bleed out.
- the optical film of the present invention may further contain an antioxidant, an antistatic agent, a flame retardant and the like for thermal decomposition during molding and coloring by heat.
- Phosphorus flame retardants include red phosphorus, triaryl phosphate ester, diaryl phosphate ester, monoaryl phosphate ester, aryl phosphonate compound, aryl phosphine oxide compound, condensed aryl phosphate ester, halogenated alkyl phosphate ester, One or more kinds selected from halogen condensed phosphoric acid esters, halogen-containing condensed phosphonic acid esters, halogen-containing phosphorous acid esters and the like can be mentioned.
- triphenyl phosphate 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, phenylphosphonic acid, tris ( ⁇ -chloroethyl) phosphate, tris (dichloropropyl) phosphate. , Tris (tribromoneopentyl) phosphate, and the like.
- the optical film of the present invention may further contain an ultraviolet absorber.
- the ultraviolet absorber may be benzotriazole, 2-hydroxybenzophenone, salicylic acid phenyl ester, or the like.
- an ultraviolet absorber having a molecular weight of 400 or more is difficult to volatilize at a high boiling point and hardly scatters at the time of high-temperature molding. Therefore, even if the addition amount is relatively small, weather resistance can be imparted to the resulting film. it can.
- ultraviolet absorbers having a molecular weight of 400 or more examples include 2- [2-hydroxy-3,5-bis ( ⁇ , ⁇ -dimethylbenzyl) phenyl] -2-benzotriazole, 2,2-methylenebis [4- Benzotriazoles such as (1,1,3,3-tetrabutyl) -6- (2H-benzotriazol-2-yl) phenol]; Hindered amines such as bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate; 2- (3,5-di-t-butyl-4-hydroxybenzyl) -2-n-butylmalonate bis (1,2,2,6,6-pentamethyl-4-piperidyl), 1- [2- [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxy] ethyl] -4- [3- (3,5-di
- Fine particles are made of an inorganic compound or an organic compound.
- inorganic compounds include silicon dioxide, titanium dioxide, aluminum oxide, zirconium oxide, calcium carbonate, calcium carbonate, talc, clay, calcined kaolin, calcined calcium silicate, hydrated calcium silicate, aluminum silicate, magnesium silicate And calcium phosphate.
- organic compounds include polytetrafluoroethylene, cellulose acetate, polystyrene, polymethyl methacrylate, polypropyl methacrylate, polymethyl acrylate, polyethylene carbonate, acrylic styrene resin, silicone resin, polycarbonate resin, benzoguanamine resin, melamine Resin, polyolefin powder, polyester resin, polyamide resin, polyimide resin, polyfluorinated ethylene resin, pulverized classification of organic polymer compounds such as starch, polymer compound synthesized by suspension polymerization method, spray It may be a polymer compound or the like made spherical by a dry method or a dispersion method.
- the fine particles can be composed of a compound containing silicon (preferably silicon dioxide) from the viewpoint that the haze of the obtained film can be kept low.
- Examples of the fine particles of silicon dioxide include Aerosil R972, R972V, R974, R812, 200, 200V, 300, R202, OX50, TT600 (manufactured by Nippon Aerosil Co., Ltd.) and the like.
- zirconium oxide fine particles examples include Aerosil R976 and R811 (manufactured by Nippon Aerosil Co., Ltd.).
- the polymer fine particle resin examples include a silicone resin, a fluororesin, and a (meth) acrylic resin, preferably a silicone resin, and more preferably a silicone resin having a three-dimensional network structure.
- silicone resins include Tospearl 103, 105, 108, 120, 145, 3120, and 240 (manufactured by Toshiba Silicone Co., Ltd.).
- Aerosil 200V and Aerosil R972V are particularly preferable because they can improve the slipperiness of the film surface while keeping the haze of the optical film low.
- the average primary particle diameter of the fine particles is preferably 5 to 400 nm, more preferably 10 to 300 nm.
- the fine particles may mainly form secondary aggregates having a particle size of 0.05 to 0.3 ⁇ m. If the average particle size of the fine particles is 100 to 400 nm, they can exist as primary particles without agglomeration.
- the dynamic friction coefficient of at least one surface of the optical film is 0.2 to 1.0.
- the content of the fine particles is preferably 0.01 to 1% by mass and more preferably 0.05 to 0.5% by mass with respect to the thermoplastic resin.
- the optical film of the present invention may further contain a dispersant in order to enhance the dispersibility of the fine particles.
- the dispersant is one or more selected from amine-based dispersants and carboxyl group-containing polymer dispersants.
- the amine dispersant is preferably an alkylamine or an amine salt of polycarboxylic acid.
- Specific examples thereof include polyester acid, polyether ester acid, fatty acid, fatty acid amide, polycarboxylic acid, alkylene oxide, and polyalkylene oxide.
- Examples of amine salts include amidoamine salts, aliphatic amine salts, aromatic amine salts, alkanolamine salts, polyvalent amine salts and the like.
- amine dispersants include polyoxyethylene fatty acid amide, polyoxyethylene alkylamine, tripropylamine, diethylaminoethylamine, dimethylaminopropylamine, diethylaminopropylamine and the like.
- examples of commercially available products include Solspers series (manufactured by Lubrizol), Ajisper series (manufactured by Ajinomoto Co.), BYK series (manufactured by Big Chemie), EFKA series (manufactured by EFKA), and the like.
- the carboxyl group-containing polymer dispersant is preferably a polycarboxylic acid or a salt thereof, and may be, for example, polycarboxylic acid, ammonium polycarboxylate, sodium polycarboxylate, or the like.
- Specific examples of the carboxyl group-containing polymer dispersant include polyacrylic acid, ammonium polyacrylate, sodium polyacrylate, ammonium polyacrylate copolymer, polymaleic acid, ammonium polymaleate, and sodium polymaleate.
- the amine-based dispersant and the carboxyl group-containing polymer dispersant may be used after being dissolved in a solvent component, or may be commercially available.
- the content of the dispersant is preferably 0.2% by mass or more based on the fine particles, although it depends on the type of the dispersant. When the content of the dispersant is less than 0.2% by mass with respect to the fine particles, the dispersibility of the fine particles cannot be sufficiently improved.
- the optical film of the present invention further contains a surfactant or the like, adsorption of the dispersant to the surface of the fine particles is less likely to occur than the surfactant, and the fine particles may be easily re-aggregated. Since the dispersant is expensive, its content is preferably as small as possible. On the other hand, when the content of the dispersant is too small, poor wettability of fine particles and a decrease in dispersion stability are likely to occur. Therefore, when the optical film of the present invention further contains a surfactant or the like, the content of the dispersant can be about 0.05 to 10 parts by weight with respect to 10 parts by weight of the fine particles.
- the optical film of the present invention preferably has an in-plane phase difference R 0 (550) measured at a wavelength of 550 nm under the condition of 23 ° C. and 55% RH and satisfies the following (a). .
- An optical film in which R 0 (550) satisfies the following range can preferably function as, for example, a ⁇ / 4 retardation film.
- the optical film of the present invention more preferably satisfies 120 ⁇ R 0 (550) ⁇ 160, and more preferably satisfies 130 ⁇ R 0 (550) ⁇ 150.
- the thickness direction retardation Rth (550) measured at a wavelength of 550 nm preferably satisfies 50 nm ⁇ Rth (550) ⁇ 250 nm under conditions of 23 ° C. and 55% RH.
- the optical film of the present invention has the following conditions when the retardation in the in-plane direction measured at wavelengths of 450 nm and 650 nm under conditions of 23 ° C. and 55% RH is R 0 (450) and R 0 (650), respectively. It is preferable to further satisfy (b) and (c). (B) 0.72 ⁇ R 0 (450) / R 0 (550) ⁇ 0.96 (C) 0.83 ⁇ R 0 (550) / R 0 (650) ⁇ 0.97
- An optical film in which R 0 (450) / R 0 (550) or R 0 (550) / R 0 (650) satisfies the above range gives a phase difference of ⁇ / 4 to light in a wide wavelength region, for example. And can function preferably as a ⁇ / 4 retardation film.
- light leakage and color change in an oblique direction when the display device displays black can be reduced.
- blue reproducibility is high
- red reproducibility is high.
- the optical film of the present invention more preferably satisfies 0.79 ⁇ R 0 (450) / R 0 (550) ⁇ 0.89, and 0.84 ⁇ R 0 (550) / R 0 (650) ⁇ 0. It is more preferable to satisfy .93.
- R 0 phase difference
- R 0 (450) / R 0 (550) and R 0 (550) / R 0 (650) (wavelength dispersibility) are the contents of the compound used in the present invention and the stretching conditions. Can be adjusted by. In order to satisfy all of the above (a) to (c), for example, it is preferable to contain a certain amount of the compound used in the present invention and to adjust the stretching conditions.
- R 0 and Rth are defined by the following formulas, respectively.
- Formula (I): R 0 (nx ⁇ ny) ⁇ d (nm)
- Formula (II): Rth ⁇ (nx + ny) / 2 ⁇ nz ⁇ ⁇ d (nm)
- nx represents the refractive index in the slow axis direction x where the refractive index is maximum in the in-plane direction of the optical film
- ny represents the refractive index in the direction y perpendicular to the slow axis direction x in the in-plane direction of the optical film
- nz represents the refractive index in the thickness direction z of the optical film
- d (nm) represents the thickness of the optical film)
- R 0 and Rth can be measured using an automatic birefringence meter; for example, AxoScan manufactured by Axometric, KOBRA-21ADH manufactured by Oji Scientific Instruments, and the like. Specifically, it can be measured by the following method. 1) The optical film is conditioned at 23 ° C. and 55% RH. The average refractive index of the optical film after humidity adjustment at 450 nm, 550 nm, and 650 nm is measured using an Abbe refractometer and a spectral light source. Moreover, the thickness of an optical film is measured using a film thickness meter.
- R 0 (650) is measured with an AxoScan manufactured by Axometric.
- phase difference R ( ⁇ ) when light of 450 nm, 550 nm, or 650 nm is incident is measured.
- the phase difference R ( ⁇ ) can be measured at 6 points every 10 ° within a range of ⁇ from 0 ° to 50 °.
- the in-plane slow axis of the optical film can be confirmed with an AxoScan manufactured by Axometric.
- nx, ny and nz are calculated by AxoScan manufactured by Axometric. Then, based on the following formulas (I) and (II), thickness direction retardations Rth (450), Rth (550) or Rth (650) at the measurement wavelengths of 450 nm, 550 nm, or 650 nm are respectively calculated.
- the phase difference can be measured under conditions of 23 ° C. and 55% RH.
- nx ( ⁇ ) represents a refractive index in the slow axis direction x at which the refractive index is maximum in the in-plane direction of the optical film when light having a wavelength ⁇ is incident
- ny ( ⁇ ) represents a refractive index in a direction y perpendicular to the slow axis direction x in the in-plane direction of the optical film when light having a wavelength ⁇ is incident
- nz ( ⁇ ) represents the refractive index in the thickness direction z of the optical film when light having a wavelength ⁇ is incident
- d (nm) represents the thickness of the optical film)
- R 0 (450) / R 0 (550) is calculated from the obtained R 0 (450) and R 0 (550); from the obtained R 0 (550) and R 0 (650), R 0 (550) / R 0 (650) is calculated.
- the angle ⁇ (orientation angle) formed by the slow axis in the plane of the optical film and the width direction of the film is preferably 40 ° or more and 50 ° or less.
- the orientation angle is within the above range, the optical film is unwound from the roll body and has a slow axis in an oblique direction with respect to the long direction, and the transmission axis is unwound from the roll body and parallel to the long direction.
- a circularly polarizing plate can be easily produced by laminating the polarizer films having rolls to rolls so that the longitudinal directions thereof overlap each other. Thereby, there is little cut loss of a film and it is advantageous on production.
- the orientation angle ⁇ of the optical film can be measured with an automatic birefringence meter KOBRA-21ADH (Oji Scientific Instruments).
- Nz Rth (550) / R 0 (550) +0.5 satisfies the relationship of the following formula (d).
- the Nz value is in the following range, the thickness direction retardation Rth is relatively smaller than the in-plane direction retardation R 0 , and therefore the oblique color of the display device including the optical film of the present invention. Taste change can be reduced.
- nx ( ⁇ ) represents a refractive index in the slow axis direction x at which the refractive index is maximum in the in-plane direction of the optical film when light having a wavelength ⁇ is incident; ny ( ⁇ ) represents a refractive index in a direction y perpendicular to the slow axis direction x in the in-plane direction of the optical film when light having a wavelength ⁇ is incident; nz ( ⁇ ) represents the refractive index in the thickness direction z of the optical film when light having a
- the thickness of the optical film is preferably 250 ⁇ m or less, more preferably 100 ⁇ m or less, and even more preferably 70 ⁇ m or less in order to reduce fluctuations in retardation due to heat or humidity.
- the thickness of the optical film is preferably 10 ⁇ m or more, and more preferably 20 ⁇ m or more, in order to develop a certain level of film strength or retardation. When the thickness of the optical film is within these ranges, it is preferable from the viewpoint of thinning the display device and productivity.
- the haze (total haze) of the optical film is preferably less than 1%, more preferably 0.5% or less, and further preferably 0.2% or less. When the haze is 1% or more, the transparency of the film is lowered and the film may not function sufficiently as an optical film.
- the haze (total haze) of the optical film can be measured with a haze meter NDH-2000 manufactured by Nippon Denshoku Co., Ltd. in accordance with JIS K-7136.
- the light source of the haze meter may be a 5V9W halogen sphere, and the light receiving part may be a silicon photocell (with a relative visibility filter).
- the haze can be measured under conditions of 23 ° C. and 55% RH.
- the visible light transmittance of the optical film is preferably 90% or more, and more preferably 93% or more.
- the optical film of the present invention has an elongation at break in at least one direction measured according to JIS-K7127-1999, preferably 10% or more, more preferably 20% or more, and further preferably 30. % Or more.
- the optical film of the present invention has a high retardation in the in-plane direction and sufficient reverse wavelength dispersion. Therefore, the optical film of the present invention has a high retardation in a wide wavelength region.
- the optical film of the present invention is used as an optical film of an image display device such as an organic EL display device or a liquid crystal display device; specifically, a polarizing plate protective film, a retardation film, an optical compensation film, an antireflection film, and preferably Is used as a ⁇ / 4 retardation film.
- the ⁇ / 4 retardation film has an in-plane retardation R 0 of about 1 ⁇ 4 of a predetermined wavelength of light (usually in the visible light region).
- the ⁇ / 4 retardation film is preferably composed of a single layer of the optical film of the present invention.
- the ⁇ / 4 retardation film is preferably used for an antireflection film of an organic EL display device.
- the optical film of the present invention can be produced by a solution casting method or a melt casting method. From the viewpoint of suppressing optical defects such as coloring of the optical film, foreign matter defects, and die lines, the solution casting method is preferable; from the viewpoint of suppressing the solvent remaining in the optical film, the melt casting method is preferable.
- A) Solution casting method An optical film containing cellulose acetate is produced by the solution casting method.
- A1) A step of preparing a dope by dissolving at least cellulose acetate and, if necessary, other additives in a solvent.
- A2) a step of casting the dope on an endless metal support, A3) a step of evaporating the solvent from the cast dope to form a web, A4) a step of peeling the web from the metal support, and A5) After drying, it includes a step of drawing to obtain a film.
- A1) Dope preparation step In a dissolution vessel, a dope is prepared by dissolving cellulose acetate and, if necessary, other additives in a solvent.
- any solvent can be used as long as it dissolves cellulose acetate and other additives.
- a chlorinated organic solvent methylene chloride
- a non-chlorinated organic solvent methyl acetate, ethyl acetate, amyl acetate, acetone, tetrahydrofuran, 1,3-dioxolane, 1,4-dioxane, cyclohexanone, ethyl formate, 2,2,2-trifluoroethanol, 2,2,3,3-hexafluoro-1-propanol, 1,3-difluoro-2-propanol, 1,1,1,3,3,3-hexafluoro- 2-methyl-2-propanol, 1,1,1,3,3,3-hexafluoro-2-propanol, 2,2,3,3,3-pentafluoro-1-propanol, nitroethane, etc.
- methylene chloride methyl acetate, ethyl
- the dope preferably further contains 1 to 40% by mass of a linear or branched aliphatic alcohol having 1 to 4 carbon atoms.
- a linear or branched aliphatic alcohol having 1 to 4 carbon atoms.
- the ratio of the alcohol in the dope is high, the web is gelled and peeling from the metal support becomes easy.
- the ratio of alcohol in the dope is small, dissolution of cellulose acetate in a non-chlorine organic solvent system can be promoted.
- linear or branched aliphatic alcohol having 1 to 4 carbon atoms examples include methanol, ethanol, n-propanol, iso-propanol, n-butanol, sec-butanol, tert-butanol and the like. Of these, ethanol is preferred because of its high dope stability, relatively low boiling point, and high drying properties.
- the solvent is preferably a mixture of methylene chloride and a linear or branched aliphatic alcohol having 1 to 4 carbon atoms.
- the concentration of cellulose acetate in the dope is preferably higher in order to reduce the drying load. However, if the concentration of cellulose acetate is too high, filtration is difficult. Therefore, the concentration of cellulose acetate in the dope is preferably 10 to 35% by mass, more preferably 15 to 25% by mass.
- the method of dissolving cellulose acetate in a solvent can be, for example, a method of dissolving under heating and pressure.
- the heating temperature is preferably higher from the viewpoint of increasing the solubility of cellulose acetate, but if it is too high, the pressure needs to be increased and the productivity is lowered. For this reason, the heating temperature is preferably 45 to 120 ° C.
- the additive may be added batchwise to the dope, or an additive solution may be separately prepared and added inline.
- thermoplastic resin When the additive solution is added in-line, it is preferable to dissolve a small amount of thermoplastic resin in order to facilitate mixing with the dope.
- the content of the thermoplastic resin is preferably 1 to 10 parts by mass, more preferably 3 to 5 parts by mass with respect to 100 parts by mass of the solvent.
- an in-line mixer such as a static mixer (manufactured by Toray Engineering) or SWJ (Toray static in-pipe mixer Hi-Mixer) is preferably used.
- the obtained dope may contain insoluble matters such as impurities contained in cellulose acetate as a raw material. Such an insoluble matter can become a bright spot foreign material in the obtained film. In order to remove such insoluble matter and the like, it is preferable to further filter the obtained dope.
- the dope filtration is preferably performed so that the number of bright spot foreign matters in the obtained film is not more than a certain value.
- the number of bright spot foreign matters having a diameter of 0.01 mm or more is 200 / cm 2 or less, preferably 100 / cm 2 or less, more preferably 50 / cm 2 or less, and still more preferably 30 Pieces / cm 2 or less, particularly preferably 10 pieces / cm 2 or less.
- the bright spot foreign matter having a diameter of 0.01 mm or less is also preferably 200 pieces / cm 2 or less, more preferably 100 pieces / cm 2 or less, further preferably 50 pieces / cm 2 or less, It is more preferably 30 pieces / cm 2 or less, particularly preferably 10 pieces / cm 2 or less, and most preferably none.
- the number of bright spot foreign matter on the film can be measured by the following procedure. 1) Two polarizing plates are arranged in a crossed Nicol state, and the obtained film is arranged between them. 2) Count the number of points (foreign matter) that light appears to leak when irradiated from one polarizing plate side and observed from the other polarizing plate side.
- A2) Casting step The dope is cast on the endless metal support from the slit of the pressure die.
- the metal support a stainless steel belt or a drum whose surface is plated with a casting is preferably used.
- the surface of the metal support is preferably mirror-finished.
- the cast width can be 1 ⁇ 4m.
- the surface temperature of the metal support in the casting step is set to ⁇ 50 ° C. to below the temperature at which the solvent boils and does not foam. A higher temperature is preferred because the web can be dried faster, but if it is too high, the web may foam or flatness may be reduced.
- the surface temperature of the metal support is preferably 0 to 100 ° C., more preferably 5 to 30 ° C.
- the metal support may be cooled so that the web is gelled and can be peeled off from the drum in a state containing a large amount of residual solvent.
- the method for adjusting the temperature of the metal support is not particularly limited, and there are a method of blowing hot air or cold air, and a method of contacting hot water with the back side of the metal support. It is preferable to use warm water because heat transfer is performed efficiently, so that the time until the temperature of the metal support becomes constant is short.
- A3) Solvent evaporation step A web (dope film obtained by casting a dope on a metal support) is heated on the metal support to evaporate the solvent.
- the web drying method and drying conditions may be the same as in the above-described A2) casting step.
- A4) Peeling Step The web obtained by evaporating the solvent on the metal support is peeled off at the peeling position on the metal support.
- the residual solvent amount of the web at the time of peeling at the peeling position on the metal support is preferably 10 to 150% by mass, and 20 to 40% by mass or 60 to 60% by mass in order to improve the flatness of the obtained film. It is more preferably 130% by mass, and further preferably 20-30% by mass or 70-120% by mass.
- Residual solvent amount (%) (mass before web heat treatment ⁇ mass after web heat treatment) / (mass after web heat treatment) ⁇ 100
- the heat treatment for measuring the residual solvent amount means a heat treatment at 115 ° C. for 1 hour.
- the web obtained by peeling from the metal support is dried as necessary and then stretched.
- the web may be dried while being transported by a large number of rolls arranged vertically, or may be dried while being transported while fixing both ends of the web with clips.
- the method for drying the web may be a method of drying with hot air, infrared rays, a heating roll, microwaves, or the like, and a method of drying with hot air is preferable because it is simple.
- the optical film having a desired retardation is obtained by stretching the web.
- the retardation of the optical compensation film can be controlled by adjusting the magnitude of the tension applied to the web.
- the web is stretched in one or more directions of the web width direction (TD direction), the transport direction (MD direction), or the oblique direction.
- TD direction the web width direction
- MD direction transport direction
- oblique direction At least an oblique direction; specifically, 45 ° with respect to the width direction of the web It is preferable to stretch in the direction.
- a circularly polarizing plate can be easily manufactured by simply laminating with a roll-to-roll so that the long directions overlap each other. Therefore, the cut loss of the film can be reduced, which is advantageous in production.
- the web may be stretched uniaxially or biaxially.
- Biaxial stretching may be sequential biaxial stretching or simultaneous biaxial stretching.
- the draw ratio may be 1.5 to 2.5 times in an oblique direction, for example, depending on the thickness of the obtained optical film and the required retardation.
- the stretching temperature of the web is preferably 120 to 230 ° C., more preferably 150 to 220 ° C., and even more preferably more than 150 ° C. and 210 ° C. or less.
- the stretching method of the web is not particularly limited, and a method (roll stretching method) in which a plurality of rolls are provided with a circumferential speed difference and stretched in the casting direction (MD direction) using the roll circumferential speed difference between them. Fix both ends with clips and pins, and widen the gap between the clips and pins in the casting direction (MD direction) and extend in the casting direction (MD direction), or widen in the width direction (TD direction) and the width direction (TD direction) or a method of extending in both the casting direction (MD direction) and the width direction (TD direction) by extending both in the casting direction (MD direction) and the width direction (TD direction) ( Tenter stretching method).
- a tenter that can independently control the web gripping length (the distance from the start of gripping to the end of gripping) by the left and right gripping means may be used. These stretching methods may be combined.
- Examples of the stretching apparatus having a mechanism for stretching in an oblique direction include the stretching apparatus described in Example 1 of Japanese Patent Laid-Open No. 2003-340916, the stretching apparatus illustrated in FIG. The stretching apparatus described in 2007-30466 and the stretching apparatus used in Example 1 of Japanese Patent Laid-Open No. 2007-94007 are included.
- the residual solvent of the web at the start of stretching is preferably 20% by mass or less, more preferably 15% by mass or less.
- the film after stretching is dried as necessary and then wound.
- the film may be dried while being transported by a large number of rolls arranged on the top and bottom (roll method), or may be dried while being transported while fixing both ends of the web with clips. (Tenter method).
- B) Melt Casting Method The method for producing the optical film of the present invention by the melt casting method is as follows: B1) Step of producing molten pellets (pelletizing step), B2) Step of extruding after melting and kneading the molten pellets (melting) Extruding step), B3) a step of cooling and solidifying the molten resin to obtain a web (cooling solidification step), and B4) a step of stretching the web (stretching step).
- the resin composition containing the thermoplastic resin as the main component of the optical film is previously kneaded and pelletized.
- Pelletization can be performed by a known method. For example, a resin composition containing the above-described thermoplastic resin and, if necessary, an additive such as a plasticizer is melt-kneaded with an extruder, and then die-molded. Extruded into strands. The molten resin extruded in a strand shape can be cooled with water or air, and then cut to obtain pellets.
- the raw material of the pellet is preferably dried before being supplied to the extruder in order to prevent decomposition.
- the mixture of the antioxidant and the thermoplastic resin may be mixed with each other; the antioxidant dissolved in the solvent may be impregnated into the thermoplastic resin; and the antioxidant may be mixed. You may spray and mix in a thermoplastic resin.
- the atmosphere around the feeder portion of the extruder and the outlet portion of the die is preferably an atmosphere of dehumidified air or nitrogen gas in order to prevent deterioration of the raw material of the pellet.
- an extruder it is preferable to knead at a low shearing force or at a low temperature so as not to cause deterioration of the resin (decrease in molecular weight, coloring, gel formation, etc.).
- a twin screw extruder it is preferable to use a deep groove type screw and to rotate the two screws in the same direction.
- two screw shapes mesh with each other.
- An optical film may be produced by melting and kneading a thermoplastic resin that has not been melt-kneaded as a raw material with an extruder as it is, without pelletizing the resin composition containing the thermoplastic resin.
- the melting temperature of the film material in the extruder is preferably in the range of Tg ° C. to (Tg + 100) ° C. when the glass transition temperature of the film is Tg ° C., more preferably ( The range is from Tg + 10) ° C. to (Tg + 90) ° C.
- a mixing device such as a static mixer is further arranged on the downstream side of the extruder to uniformly mix these components. May be.
- the molten resin extruded from the extruder is filtered with a leaf disc filter or the like as necessary, and further mixed with a static mixer or the like, and extruded from a die into a film.
- the extrusion flow rate is preferably stabilized using a gear pump.
- the leaf disk filter used for removal of a foreign material is a stainless fiber sintered filter.
- a stainless steel fiber sintered filter is an integrated stainless steel fiber body that is intricately intertwined and then compressed and sintered at the contact point. The density is changed according to the thickness of the fiber and the amount of compression, and the filtration accuracy is improved. Can be adjusted.
- the melting temperature Tm of the resin at the exit portion of the die can be about 200 to 300 ° C.
- Cooling and solidifying step The resin extruded from the die is nipped between the cooling roll and the elastic touch roll to make the film-like molten resin a predetermined thickness. Then, the film-like molten resin is cooled stepwise with a plurality of cooling rolls and solidified.
- the surface temperature Tr1 of the cooling roll can be Tg (° C.) or lower when the glass transition temperature of the obtained film is Tg (° C.).
- the surface temperatures of the plurality of cooling rolls may be different.
- the elastic touch roll is also called a pinching rotator.
- a commercially available elastic touch roll can also be used.
- the film surface temperature Tt on the elastic touch roll side can be Tg or more and Tg + 110 ° C. or less of the film.
- the film-like molten resin solidified from the cooling roll is peeled off with a peeling roll to obtain a web.
- peeling the film-like molten resin it is preferable to adjust the tension in order to prevent deformation of the resulting web.
- Stretching step The obtained web is stretched with a stretching machine to obtain a film. Stretching is performed in one or more directions of the web width direction (TD direction), the conveyance direction (MD direction), or the oblique direction. In order to set the angle ⁇ 1 between the in-plane slow axis of the obtained optical film and the width direction of the film to 40 to 50 °, at least an oblique direction; specifically, 45 ° with respect to the width direction of the web It is preferable to stretch in the direction.
- the web stretching method, stretching ratio, and stretching temperature can be the same as described above.
- the circularly polarizing plate of the present invention includes a polarizer (linearly polarizing film) and the optical film of the present invention disposed on at least one surface thereof.
- the optical film of the present invention may be disposed directly on the polarizer or may be disposed via another layer or film.
- the polarizer may be an iodine polarizing film, a dye polarizing film using a dichroic dye, or a polyene polarizing film.
- the iodine-based polarizing film and the dye-based polarizing film may be a film obtained by uniaxially stretching a poly (vinyl alcohol) film and then dyeing with iodine or a dichroic dye, or polyvinyl alcohol.
- the film may be a uniaxially stretched film (preferably a film further subjected to a durability treatment with a boron compound) after the system film is dyed with iodine or a dichroic dye.
- the transmission axis of the polarizer is parallel to the stretching direction of the film.
- the polyvinyl alcohol film may be a film formed from a polyvinyl alcohol aqueous solution.
- the polyvinyl alcohol film is preferably an ethylene-modified polyvinyl alcohol film because it is excellent in polarizing performance and durability performance and has few color spots.
- dichroic dyes examples include azo dyes, stilbene dyes, pyrazolone dyes, triphenylmethane dyes, quinoline dyes, oxazine dyes, thiazine dyes and anthraquinone dyes.
- the thickness of the polarizer is preferably 5 to 30 ⁇ m, more preferably 10 to 20 ⁇ m.
- the angle at which the transmission axis of the polarizer and the in-plane slow axis of the optical film of the present invention intersect is preferably 40 to 50 °.
- a reflective polarizing plate may be further disposed between the polarizer and the optical film of the present invention.
- the reflective polarizing plate transmits linearly polarized light in a direction parallel to the transmission axis of the polarizer and reflects linearly polarized light in a direction different from the transmission axis.
- the organic EL display device having such a circularly polarizing plate can emit more light emitted from the light emitting layer to the outside.
- Examples of the reflective polarizing plate include a birefringent optical polarizer (described in JP-A-8-503313) in which polymer thin films having different refractive indexes in one direction are alternately laminated, and a polarizing separation film having a cholesteric structure ( Described in JP-A-11-44816). Moreover, you may arrange
- a transparent protective film other than the optical film of the present invention may be disposed on the other surface of the polarizer.
- the transparent protective film is not particularly limited, and may be a normal cellulose ester film or the like.
- cellulose ester film examples include commercially available cellulose ester films (for example, Konica Minoltack KC8UX, KC5UX, KC8UCR3, KC8UCR4, KC8UCR5, KC8UY, KC6UY, KC4UY, KC4UE, KC8UE, KC8UY-HA-X8-U8-U8-HA-X8 -C, KC8UXW-RHA-NC, KC4UXW-RHA-NC, manufactured by Konica Minolta Opto Co., Ltd.) are preferably used.
- cellulose ester films for example, Konica Minoltack KC8UX, KC5UX, KC8UCR3, KC8UCR4, KC8UCR5, KC8UY, KC6UY, KC4UY, KC4UE, KC8UE, KC8UY-HA-X8-U8-U8-HA-X8 -C
- the thickness of the transparent protective film is not particularly limited, but can be about 10 to 200 ⁇ m, preferably 10 to 100 ⁇ m, more preferably 10 to 70 ⁇ m.
- the transparent protective film or the ⁇ / 4 retardation film is disposed on the outermost surface of the display
- the transparent hard coat layer, the antiglare layer is provided on the outermost surface of the transparent protective film or the ⁇ / 4 retardation film.
- a layer, an antireflection layer, or the like may be further provided.
- the circularly polarizing plate can be manufactured through a step of bonding a polarizer and the optical film of the present invention.
- a polarizer and the optical film of the present invention As the adhesive used for bonding, for example, a completely saponified polyvinyl alcohol aqueous solution is preferably used.
- the circularly polarizing plate can be preferably used for an image display device such as an organic EL display device or a liquid crystal display device described later.
- Image Display Device includes the optical film of the present invention.
- Examples of the image display device of the present invention include an organic EL display device and a liquid crystal display device.
- FIG. 2 is a schematic diagram showing an example of the configuration of the organic EL display device.
- the organic EL display device 10 includes a light reflecting electrode 12, a light emitting layer 14, a transparent electrode layer 16, a transparent substrate 18, and a circularly polarizing plate 20 in this order.
- the circularly polarizing plate 20 includes a ⁇ / 4 retardation film 20A and a polarizer (linear polarizing film) 20B; the ⁇ / 4 retardation film 20A can be used as the optical film of the present invention.
- the light reflecting electrode 12 is preferably made of a metal material having a high light reflectance.
- the metal material include Mg, MgAg, MgIn, Al, LiAl, and the like.
- the flatter surface of the light reflecting electrode 12 is preferable because irregular reflection of light can be prevented.
- the light reflecting electrode 12 can be formed by a sputtering method.
- the light reflecting electrode 12 may be patterned. Patterning can be performed by etching.
- the light emitting layer 14 includes an R (red) light emitting layer, a G (green) light emitting layer, and a B (blue) light emitting layer.
- Each light emitting layer includes a light emitting material.
- the light emitting material may be an inorganic compound or an organic compound, and is preferably an organic compound.
- Each light emitting layer may further include a charge transport material and may further have a function as a charge transport layer; it may further include a hole transport material and may further have a function as a hole transport layer.
- the organic EL display device 10 may further include a charge transport layer or a hole transport layer.
- Each light emitting layer is obtained by patterning. Patterning can be performed using a photomask or the like.
- the light emitting layer 14 can be formed by evaporating a light emitting material.
- the transparent electrode layer 16 can generally be an ITO electrode.
- the transparent electrode layer 16 can be formed by a sputtering method or the like.
- the transparent electrode layer 16 may be patterned. Patterning can be performed by etching.
- the transparent substrate 18 may be any material that can transmit light, and may be a glass substrate, a plastic film, a thin film, or the like.
- the circularly polarizing plate 20 is disposed so that the ⁇ / 4 retardation film 20A side is the transparent substrate 18 side; the polarizer 20B side is the viewing side.
- the light emitting layer 14 when the light reflecting electrode 12 and the transparent electrode layer 16 are energized, the light emitting layer 14 emits light and can display an image.
- the R (red) light emitting layer, the G (green) light emitting layer, and the B (blue) light emitting layer is configured to be energized, a full color image can be displayed.
- the optical film of the present invention or the circularly polarizing plate including the optical film is not limited to the organic EL display device having the above-described configuration, but also includes International Patent Application Nos. 96/34514, JP-A Nos. 9-127885 and 11-45058. It can also be applied to the organic EL display device described in 1. above. In that case, the optical film or the circularly polarizing plate of the present invention may be disposed in place of or together with the antireflection means of the organic EL display device provided in advance.
- optical film or circularly polarizing plate of the present invention can also be applied to an inorganic EL display device described in, for example, “Electroluminescence Display” (Toshio Higuchi, Sangyo Tosho Co., Ltd., published in 1991).
- FIG. 3 is a schematic diagram for explaining the antireflection function by the circularly polarizing plate 20.
- the circularly polarizing plate 20 includes a polarizer (LP) 20B and a ⁇ / 4 retardation film 20A arranged on one surface thereof.
- LP polarizer
- the circularly polarized light (c2) When the circularly polarized light (c2) is reflected by the light reflecting electrode 12 (see FIG. 1) of the organic EL display device, the circularly polarized light (c3) becomes a reverse circularly polarized light (c3).
- the reversely circularly polarized light (c3) passes through the ⁇ / 4 retardation film 20A and is converted to linearly polarized light (b3) in a direction orthogonal to the transmission axis direction of the polarizer (LP) 20B.
- the linearly polarized light (b3) is absorbed without passing through the polarizer (LP) 20B.
- the ⁇ / 4 retardation film 20A of the present invention exhibits sufficient reverse wavelength dispersion, it can impart a ⁇ / 4 retardation to light in a wide wavelength region. Therefore, most of the light incident from the outside can be prevented from leaking outside the display device. Accordingly, it is possible to suppress “light leakage in the front direction” when the organic EL display device displays black, and to prevent reflection.
- the ⁇ / 4 retardation film 20A of the present invention has sufficient reverse wavelength dispersion, and can reduce the thickness of the film. Therefore, the difference between the color in the front direction and the color in the oblique direction can be reduced. As a result, visibility from an oblique direction can be improved.
- light from the inside of the organic EL display device includes two kinds of circularly polarized components (c3 and c4).
- One circularly polarized light (c3) passes through the ⁇ / 4 retardation film 20A and is converted into linearly polarized light (b3) in a direction orthogonal to the transmission axis direction of the polarizer (LP) 20B.
- the linearly polarized light (b3) is absorbed without passing through the polarizer (LP) 20B.
- the other circularly polarized light (c4) passes through the ⁇ / 4 retardation film 20A and is converted into linearly polarized light (b4) parallel to the transmission axis direction of the polarizer (LP) 20B.
- the linearly polarized light (b4) passes through the polarizer (LP) 20B and becomes linearly polarized light (b4), which is recognized as an image.
- a reflective polarizing plate that reflects linearly polarized light (b3) in a direction orthogonal to the transmission axis direction of the polarizer (LP) 20B. Further, it may be arranged.
- the reflective polarizing plate reflects the linearly polarized light (b3) without being absorbed by the polarizer (LP) 20B, reflects it again by the light reflecting electrode 12 (see FIG. 1), and transmits the light through the polarizer (LP) 20B. It can be converted into linearly polarized light (b4) parallel to the axial direction. That is, by further disposing the reflective polarizing plate, all of the light (c3 and c4) emitted from the light emitting layer can be emitted to the outside.
- FIG. 4 is a schematic diagram showing an example of the configuration of the liquid crystal display device.
- the liquid crystal display device 30 includes a liquid crystal cell 40, a first polarizing plate 50 and a second polarizing plate 60 that sandwich the liquid crystal cell 40, and a backlight 70.
- the display method of the liquid crystal cell 40 is not particularly limited, and is a TN (Twisted Nematic) method, an STN (SuperwTwisted Nematic) method, an IPS (In-PlaneitSwitching) method, an OCB (Optically Compensated BirrefrenceAbirefringenceAbirefringenceAbirefringenceAbirefringenceAbirefringenceAbirefringenceAbirefringenceAbirefringenceAbirefringenceAbirefringenceAbireflenceAbirefrence
- MVA Multi-domain Vertical Alignment
- PVA including Patterned Vertical Alignment
- HAN Hybrid Aligned Nematic
- the VA liquid crystal cell has a pair of transparent substrates and a liquid crystal layer sandwiched between them.
- one transparent substrate is provided with a pixel electrode for applying a voltage to liquid crystal molecules.
- the counter electrode may be disposed on the one transparent substrate (where the pixel electrode is disposed) or may be disposed on the other transparent substrate.
- the liquid crystal layer includes liquid crystal molecules having negative or positive dielectric anisotropy.
- Liquid crystal molecules are liquid crystal molecules when no voltage is applied (when no electric field is generated between the pixel electrode and the counter electrode) due to the alignment regulating force of the alignment film provided on the liquid crystal layer side surface of the transparent substrate. Are oriented so that their major axes are substantially perpendicular to the surface of the transparent substrate.
- an electric field is generated between the pixel electrode and the counter electrode by applying an image signal (voltage) to the pixel electrode.
- the liquid crystal molecules initially aligned perpendicularly to the surface of the transparent substrate are aligned so that the major axis thereof is in the horizontal direction with respect to the substrate surface.
- the liquid crystal layer is driven, and the image display is performed by changing the transmittance and reflectance of each sub-pixel.
- the 1st polarizing plate 50 is arrange
- the 2nd polarizing plate 60 is arrange
- One of the protective films 56 (F2) and 64 (F3) may be omitted as necessary.
- any of the protective films 54 (F1), 56 (F2), 64 (F3) and 66 (F4) can be used as the optical film of the present invention.
- Resin (V) Dialnal BR-85 (Mitsubishi Rayon Co., Ltd.) Production of resin (VI) pellets (Synthesis Example 1) 204 kg of methyl methacrylate (MMA), 51 kg of methyl 2- (hydroxymethyl) acrylate (MHMA), and 249 kg of toluene were charged into a reaction kettle equipped with a stirrer, a temperature sensor, a cooling pipe, and a nitrogen introduction pipe. To this, the temperature was raised to 105 ° C.
- MMA methyl methacrylate
- MHMA methyl 2- (hydroxymethyl) acrylate
- the polymer solution obtained by the above cyclization condensation reaction was subjected to a vent having a barrel temperature of 250 ° C., a rotation speed of 150 rpm, a degree of vacuum of 13.3 to 400 hPa (10 to 300 mmHg), a rear vent number of one, and a forevent number of four. It introduce
- the mass average molecular weight of the obtained resin (VI) pellets was 110,000, and the lactone ring content was 28.5%.
- the wavelength of maximum absorption on the long wavelength side in the wavelength region of 200 to 350 nm is ⁇ max1
- the absorbance at ⁇ max1 is Abs1
- the wavelength of maximum absorption on the short wavelength side is ⁇ max2
- the wavelength at ⁇ max2 Absorbance was set to Abs2. Then, ( ⁇ max1- ⁇ max2) and the absorbance ratio Abs1 / Abs2 were measured.
- In-plane retardation increase sensitivity (retardance sensitivity A in the in-plane direction of the sample film) ⁇ (retardation sensitivity B in the in-plane direction of the blank film)
- Fine Particle Additive Solution 1 The obtained fine particle dispersion 1 was slowly added to a dissolution tank charged with methylene chloride with sufficient stirring. The obtained solution was dispersed with an attritor so that the particle size of the secondary particles of the fine particles became a predetermined size, and then filtered with Finemet NF manufactured by Nippon Seisen Co., Ltd. 1 was obtained.
- (Fine particle addition liquid 1) Methylene chloride: 99 parts by mass Fine particle dispersion 1: 5 parts by mass
- the obtained dope solution was uniformly cast on a stainless belt support using an endless belt casting apparatus. After the solvent in the cast film cast on the stainless steel belt support was evaporated until the residual solvent amount became 75%, the obtained web was peeled from the stainless steel belt support. The web obtained by peeling was conveyed while being gripped by a clip of a tenter stretching apparatus. Thereafter, the obtained film was dried while being conveyed by a number of rolls in a drying zone. Then, after slit-removing the width direction edge part of the film currently hold
- the obtained original film was unwound and stretched in an oblique direction at an actual draw ratio of 110% at a glass transition temperature of the original film + 20 ° C. to obtain an optical film 1 having a film thickness of 85 ⁇ m.
- the angle ⁇ formed between the in-plane slow axis of the obtained optical film 1 and the width direction of the film was 45 °.
- R0 (450), R0 (550), and R0 (650) were measured by the above-mentioned method, and wavelength dispersibility was computed from them. Moreover, the haze under the conditions of 23 ° C. and 55% RH was measured, and the Nz coefficient was calculated. Each value is shown in Table 6.
- Polarizing Plate 1 The bonded surface of the optical film 1 produced above with the polarizer was subjected to alkali saponification treatment. Similarly, a Konica Minolta tack film KC6UA (manufactured by Konica Minolta Opto Co., Ltd.) was prepared, and the bonding surface with the polarizer was subjected to alkali saponification treatment. Then, the optical film 1 is bonded to one surface of the polarizer through a 5% aqueous solution of polyvinyl alcohol as an adhesive; the other surface of the polarizer is Konica Minolta Tack Film KC6UA (Konica Minolta Opto Co., Ltd.).
- the circularly polarizing plate 1 was produced by pasting together a 5% aqueous solution of polyvinyl alcohol.
- the optical film 1 and the polarizer were bonded so that the angle formed by the transmission axis of the polarizer and the slow axis of the optical film 1 was 45 °.
- a light reflecting electrode made of chromium having a thickness of 80 nm was formed on a glass substrate by sputtering; an ITO thin film having a thickness of 40 nm was formed as an anode on the light reflecting electrode.
- a hole transport layer made of poly (3,4-ethylenedioxythiophene) -polystyrene sulfonate (PEDOT: PSS) having a thickness of 80 nm is formed on the anode by sputtering;
- RGB light emitting layers red light emitting layer, green light emitting layer, and blue light emitting layer
- the thickness of the light emitting layer was 100 nm for each color.
- the red light-emitting layer has tris (8-hydroxyquinolinate) aluminum (Alq3) as a host and a light-emitting compound [4- (dicyanomethylene) -2-methyl-6 (p-dimethylaminostyryl) -4H-pyran] (DCM).
- the green light-emitting layer is formed by co-evaporating Alq3 as a host and the luminescent compound coumarin 6 (mass ratio 99: 1); the blue light-emitting layer is , Balq and a luminescent compound Perylene as a host were formed by co-evaporation (mass ratio 90:10).
- a thin film having a thickness of 4 nm made of calcium having a low work function is formed as a first cathode capable of efficiently injecting electrons by a vacuum deposition method;
- a thin film made of aluminum having a thickness of 2 nm was formed as a second cathode to obtain an organic light emitting layer.
- the aluminum used as the second cathode has a role of preventing the first cathode calcium from being chemically altered when a transparent electrode is formed thereon by sputtering.
- a transparent conductive film made of ITO and having a thickness of 80 nm (the first cathode, the second cathode, and the transparent conductive film were combined to form a transparent electrode layer) was formed on the second cathode by sputtering. Furthermore, a thin film having a thickness of 200 nm made of silicon nitride was formed on the transparent conductive film by a CVD method to obtain an insulating film (transparent substrate).
- the circularly polarizing plate 1 was bonded via an adhesive to produce an organic electroluminescence display device 1.
- the lamination of the circularly polarizing plate 1 was performed so that the optical film 1 was on the insulating film side.
- the light leakage in the front direction and the color change in the oblique direction of the obtained display device were evaluated by the following methods.
- the observer performed sensory evaluation on the blackness and color shift of the display screen. Evaluation of light leakage in the front direction was performed based on the following criteria. ⁇ : luminance is less than 2cd / m 2, and look tight black ⁇ : brightness is at 2cd / m 2 or more 3 cd / m 2 within, and black toned look ⁇ : luminance 3 cd / m 2 or larger, Or it doesn't look black and looks colored
- the optical films of Examples 1 to 3 have an in-plane retardation value (R 0 (550)), an Nz coefficient, wavelength dispersion characteristics (R 0 (450) / R 0 (550) and R 0 (550) / R 0 ). (650)) are all adjusted to a predetermined range. It can be seen that the display devices including the optical films of Examples 1 to 3 can suppress both the light leakage in the front direction and the color change in the oblique direction during black display.
- the solution absorption spectrum, the aspect ratio, and the in-plane retardation increase sensitivity of the compound do not satisfy the predetermined ranges, and therefore the in-plane retardation value is greatly deviated from ⁇ / 4. It can be seen that the wavelength dispersion characteristic does not satisfy the predetermined range. It can be seen that the display devices including the optical films of Comparative Examples 1 to 10 cannot suppress the light leakage in the front direction or the color change in the oblique direction during black display.
- the optical film has a low in-plane retardation value and does not have sufficient reverse wavelength dispersion, so that the display device including the optical film is viewed from the front direction during black display. It can be seen that the light leakage of the light is large and the color change in the oblique direction is also large.
- the in-plane retardation value is too low, so that light leakage from the front direction and black color change in the oblique direction are suppressed when the display device displays black. You can see that it was not done.
- Example 4 Production of Optical Film 14
- a raw film was prepared in the same manner as for optical film 1 except that comparative compound i was changed to A-46. This was stretched in an oblique direction at an actual stretch ratio of 130% at the glass transition temperature of the original film + 20 ° C. in the same manner as the optical film 1 to obtain an optical film 14 having a thickness of 80 ⁇ m.
- the angle ⁇ formed by the in-plane slow axis and the width direction of the film was 45 °.
- a circularly polarizing plate 14 and a display device 14 were produced in the same manner as in Comparative Example 1 except that the optical film 1 was changed to the optical film 14, and the display device was evaluated.
- a raw film was prepared in the same manner as the optical film 1 except that the obtained dope solution was used. This was stretched in an oblique direction at an actual stretch ratio of 110% at the glass transition temperature of the original film + 20 ° C. in the same manner as the optical film 1 to obtain an optical film 20 with Ro (550) of 140 nm.
- the angle ⁇ formed by the in-plane slow axis and the width direction of the film was 45 °.
- a circularly polarizing plate 20 and a display device 20 were produced in the same manner as in Comparative Example 1 except that the optical film 1 was changed to the optical film 20, and the display device was evaluated.
- Example 11 Production of Optical Film 21
- a raw film was prepared in the same manner as in Comparative Example 1 except that the comparative compound i was changed to A-68 and the addition amount was 4 parts by mass. This was stretched in the transport direction at an actual stretch ratio of 110% at the glass transition temperature of the raw film + 20 ° C. to obtain an optical film 21 having a Ro (550) of 140 nm.
- the angle ⁇ formed by the in-plane slow axis and the width direction of the film was 90 °.
- the optical film 21 is cut out in a piece shape so that the in-plane slow axis is in the direction of 45 ° from the lateral side of the piece, and then the bonded surface with the polarizer is subjected to alkali saponification treatment. Otherwise, the circularly polarizing plate 21 and the display device 21 were produced in the same manner as in Comparative Example 1, and the display device was evaluated.
- Example 12 Production of Optical Film 22
- a dope solution was obtained in the same manner as in Comparative Example 1 except that the composition of the dope solution was changed as follows.
- (Dope solution composition) Methylene chloride: 260 parts by mass
- Ethanol 35 parts by mass
- Resin (VI) 100 parts by mass
- Compound A-68 5 parts by mass
- a raw film was prepared in the same manner as the optical film 1 except that the obtained dope solution was used. Similarly to the optical film 1, this was stretched in an oblique direction at an actual stretch ratio of 110% at a glass transition temperature of the original film + 20 ° C. to obtain an optical film 22 having a Ro (550) of 140 nm.
- the angle ⁇ formed by the in-plane slow axis and the width direction of the film was 45 °.
- a circularly polarizing plate 22 and a display device 22 were produced in the same manner as in Comparative Example 1 except that the optical film 1 was changed to the optical film 22, and the display device was evaluated.
- a raw film was prepared in the same manner as the optical film 1 except that the obtained dope solution was used. Similarly to the optical film 1, this was stretched in an oblique direction at an actual stretch ratio of 110% at a glass transition temperature of the original film + 20 ° C., and an optical film 23 with Ro (550) of 140 nm was obtained.
- the angle ⁇ formed by the in-plane slow axis and the width direction of the film was 45 °.
- a circularly polarizing plate 23 and a display device 23 were produced in the same manner as in Comparative Example 1 except that the optical film 1 was changed to the optical film 23, and the display device was evaluated.
- a raw film was prepared in the same manner as the optical film 1 except that the obtained dope solution was used. Similarly to the optical film 1, this was stretched in an oblique direction at an actual stretch ratio of 110% at a glass transition temperature of the original film + 20 ° C. to obtain an optical film 25 having a Ro (550) of 140 nm.
- the angle ⁇ formed by the in-plane slow axis and the width direction of the film was 45 °.
- a circularly polarizing plate 25 and a display device 25 were produced in the same manner as in Comparative Example 1 except that the optical film 1 was changed to the optical film 25, and the display device was evaluated.
- a raw film was prepared in the same manner as the optical film 1 except that the obtained dope solution was used. Similarly to the optical film 1, this was stretched in an oblique direction at an actual stretch ratio of 110% at a glass transition temperature of the original film + 20 ° C. to obtain an optical film 26 with Ro (550) of 140 nm.
- the angle ⁇ formed by the in-plane slow axis and the width direction of the film was 45 °.
- a circularly polarizing plate 26 and a display device 26 were produced in the same manner as in Comparative Example 1 except that the optical film 1 was changed to the optical film 26, and the display device was evaluated.
- the present invention it is possible to provide an optical film having a high retardation development property in the in-plane direction and sufficient reverse wavelength dispersion even when the film thickness is thin.
- the image display device including the optical film is excellent in black reproducibility under external light and excellent in visibility from an oblique direction.
- SYMBOLS 10 Organic electroluminescent display device 12
- Light reflection electrode 14 Light emitting layer 16
- Transparent electrode layer 18 Transparent substrate 20
- Polarizer (linearly-polarizing film) DESCRIPTION OF SYMBOLS 30
- Liquid crystal display device 40 Liquid crystal cell 50 1st polarizing plate 52 1st polarizer 54 Protective film (F1) 56 Protective film (F2) 60 Second polarizing plate 62 Second polarizer 64 Protective film (F3) 66 Protection Film (F4) 70 Backlight
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Abstract
Description
(1)溶液吸収スペクトルにおいて、200nm以上350nm以下の波長領域に少なくとも2つの極大吸収を有する
(2)200nm以上350nm以下の波長領域における、2つの極大吸収のうち第一の極大吸収の波長をλmax1とし、前記第一の極大吸収よりも短波長側にある第二の極大吸収の波長をλmax2としたとき、(λmax1-λmax2)が20nm以上である
(3)分子のアスペクト比が1.70以上である
(4)分子内に、非芳香族炭化水素環、芳香族複素環または非芳香族複素環を有する
(5)前記熱可塑性樹脂と、前記熱可塑性樹脂に対して1質量%の前記化合物とを含有する厚み60μmのサンプルフィルムの、延伸前の波長550nmにおける面内方向の位相差をR0A0(550)とし、前記サンプルフィルムのガラス転移温度よりも25℃高い温度で延伸後の波長550nmにおける面内方向の位相差をR0A1(550)としたとき、(R0A1(550)-R0A0(550))を延伸倍率で除して得られる面内位相差感度をAとし、
前記熱可塑性樹脂からなる厚み60μmのブランクフィルムの、波長550nmにおける延伸前の面内方向の位相差をR0B0(550)とし、前記ブランクフィルムのガラス転移温度よりも25℃高い温度で延伸後の波長550nmにおける面内方向の位相差をR0B1(550)としたとき、(R0B1(550)-R0B0(550))を延伸倍率で除して得られる面内位相差感度をBとしたとき、
(A-B)で定義される面内位相差上昇感度が0.1以上である
波長450nm、550nmおよび650nmで測定される面内方向の位相差をそれぞれR0(450)、R0(550)およびR0(650)としたとき、式(a)~(c)を全て満たすことを特徴とする、光学フィルム。
(a)110nm≦R0(550)≦170nm
(b)0.72≦R0(450)/R0(550)≦0.96
(c)0.83≦R0(550)/R0(650)≦0.97
[2] 前記熱可塑性樹脂が、セルロース誘導体を含有することを特徴とする、[1]に記載の光学フィルム。
[3] 前記化合物が、分子内に少なくとも一つの非芳香族環を有することを特徴とする[1]または[2]に記載の光学フィルム。
[4] 前記化合物の、前記(λmax1-λmax2)が50nm以上であることを特徴とする、[1]~[3]のいずれかに記載の光学フィルム。
[5] 前記光学フィルムの面内の遅相軸方向の屈折率をnxとし、前記光学フィルムの面内において前記遅相軸と直交する方向の屈折率をnyとし、前記光学フィルムの厚み方向の屈折率をnzとしたとき、式(d)の関係をさらに満たすことを特徴とする、[1]~[4]のいずれかに記載の光学フィルム。
(d)0≦Nz=Rth(550)/R0(550)+0.5≦1
[6] 前記化合物が、下記一般式(A)で表されることを特徴とする、[1]~[5]のいずれかに記載の光学フィルム。
Qは、芳香族炭化水素環、非芳香族炭化水素環、芳香族複素環または非芳香族複素環を表し;
WaおよびWbは、前記Qの環を構成する原子に結合する水素原子または置換基であり、前記Waが結合する原子と前記Wbが結合する原子とは互いに隣り合っており、かつ前記Waと前記Wbとは互いに異なっており、WaとWbは互いに結合して環を形成してもよく;
R3は、置換基を表し;
mは、0~2であり;
mが2の場合、R3は同じでも異なっていてもよく;
nは、1~10の整数を表し;nが2以上である場合、複数のQ、L2、Wa、Wb、R3、mは、互いに同一であっても異なっていてもよく;
L1およびL2は、それぞれ独立に単結合またはアルキレン基、アルケニレン基、アルキニレン基、-O-、-(C=O)-、-(C=O)-O-、-NRL-、-S-、-(O=S=O)-および-(C=O)-NRL-からなる群より選ばれる2価の連結基またはそれらの組合せを表し;
RLは、水素原子または置換基を表し;
R1およびR2は、それぞれ独立に置換基を表す)
[7] 前記一般式(A)で表される化合物が、下記一般式(B)で表される化合物であることを特徴とする、[1]~[6]のいずれかに記載の光学フィルム。
WaおよびWbは、前記Qの環を構成する原子に結合する水素原子または置換基であり、前記Waが結合する原子と前記Wbが結合する原子とは互いに隣り合っており、かつ前記Waと前記Wbとは互いに異なっており、WaとWbは互いに結合して環を形成してもよく;
R3は、置換基を表し;
mは、0~2であり;
mが2の場合、R3は同じでも異なっていてもよく;
L1およびL2は、それぞれ独立に単結合またはアルキレン基、アルケニレン基、アルキニレン基、-O-、-(C=O)-、-(C=O)-O-、-NRL-、-S-、-(O=S=O)-および-(C=O)-NRL-からなる群より選ばれる2価の連結基またはそれらの組合せを表し;
RLは、水素原子または置換基を表し;
R1およびR2は、それぞれ独立に置換基を表す)
[8] 前記一般式(B)で表される化合物が、下記一般式(1B)で表される化合物であることを特徴とする、[1]~[7]のいずれかに記載の光学フィルム。
WaおよびWbは、前記Qの環を構成する原子に結合する水素原子または置換基であり、前記Waが結合する原子と前記Wbが結合する原子とは互いに隣り合っており、かつ前記Waと前記Wbとは互いに異なっており、WaとWbは互いに結合して環を形成してもよく;
R3は、置換基を表し;
mは、0~2であり;
mが2の場合、R3は同じでも異なっていてもよく;
L1およびL2は、それぞれ独立に単結合またはアルキレン基、アルケニレン基、アルキニレン基、-O-、-(C=O)-、-(C=O)-O-、-NRL-、-S-、-(O=S=O)-および-(C=O)-NRL-からなる群より選ばれる2価の連結基またはそれらの組合せを表し;
RLは、水素原子または置換基を表し;
R1およびR2は、それぞれ独立に置換基を表す)
[9] 前記一般式(B)で表される化合物が、下記一般式(2B)で表されることを特徴とする、[1]~[7]のいずれかに記載の光学フィルム。
W1は、環状基であって、W1の環構成原子のうちベンゼン環と結合する原子が、炭素原子または窒素原子であり;
R3は、置換基を表し;
mは、0~2であり;
mが2の場合、R3は同じでも異なっていてもよく;
L1およびL2は、それぞれ独立に単結合またはアルキレン基、アルケニレン基、アルキニレン基、-O-、-(C=O)-、-(C=O)-O-、-NRL-、-S-、-(O=S=O)-および-(C=O)-NRL-からなる群より選ばれる2価の連結基またはそれらの組合せを表し;
RLは、水素原子または置換基を表し;
R1およびR2は、それぞれ独立に置換基を表す)
[10] 前記光学フィルムの厚みは、10~100μmであることを特徴とする、[1]~[9]のいずれかに記載の光学フィルム。
[11] 前記化合物の含有量は、前記熱可塑性樹脂に対して1~15質量%であることを特徴とする、[1]~[10]のいずれかに記載の光学フィルム。
[12] 前記光学フィルムの面内の遅相軸と前記光学フィルムの幅手方向とのなす角度が40°以上50°以下であることを特徴とする、[1]~[11]のいずれかに記載の光学フィルム。
[14] [1]~[12]のいずれかに記載の光学フィルムを含むことを特徴とする、画像表示装置。
本発明の光学フィルムは、熱可塑性樹脂と、本発明に用いられる化合物とを含有する。
熱可塑性樹脂は、セルロース誘導体(例えば、セルロースエステル系樹脂、セルロースエーテル系樹脂など)、ポリカーボネート系樹脂、ポリスチレン系樹脂、ポリスルホン系樹脂、ポリエステル系樹脂、ポリアリレート系樹脂、(メタ)アクリル系樹脂、オレフィン系樹脂(例えば、ノルボルネン系樹脂、環状オレフィン系樹脂、環状共役ジエン系樹脂、ビニル脂環式炭化水素系樹脂)などでありうる。なかでも、セルロース誘導体、(メタ)アクリル系樹脂、ポリカーボネート系樹脂、環状オレフィン系樹脂が好ましく、セルロース誘導体がより好ましく、セルロースエステル系樹脂が最も好ましい。
セルロース誘導体は、セルロースを原料とする化合物(セルロース骨格を有する化合物)である。セルロース誘導体の例には、セルロースエーテル(例えば、メチルセルロース、エチルセルロース、ヒドロキシエチルセルロース、ヒドロキシプロピルセルロース、シアノエチルセルロース等)、セルロースエステル(詳細は後述)、セルロースエーテルエステル(例えば、アセチルメチルセルロース、アセチルエチルセルロース、アセチルヒドロキシエチルセルロース、ベンゾイルヒドロキシプロピルセルロース等)、セルロースカーボネート(例えば、セルロースエチルカーボネート等)、セルロースカルバメート(例えば、セルロースフェニルカルバメート等が挙げられる)等が含まれ、好ましくはセルロースエステルである。セルロース誘導体は、一種類であってもよいし、二種類以上の混合物であってもよい。
溶媒:メチレンクロライド;
カラム:Shodex K806、K805、K803G(昭和電工株式会社製)を3本接続して使用する;
カラム温度:25℃;
試料濃度:0.1質量%;
検出器:RI Model 504(GLサイエンス社製);
ポンプ:L6000(日立製作所株式会社製);
流量:1.0ml/min
校正曲線:標準ポリスチレンSTK standard ポリスチレン(東ソー株式会社製) Mw=1000000~500の13サンプルによる校正曲線を使用する。13サンプルは、ほぼ等間隔に用いる。
(メタ)アクリル樹脂は、(メタ)アクリル酸エステルの単独重合体、または(メタ)アクリル酸エステルと他の共重合モノマーとの共重合体でありうる。(メタ)アクリル酸エステルは、好ましくはメチルメタクリレートである。共重合体におけるメチルメタクリレート由来の構成単位の含有割合は50質量%以上であることが好ましく、70質量%以上であることがより好ましい。
溶媒: メチレンクロライド
カラム: Shodex K806、K805、K803G(昭和電工(株)製を3本接続して使用する)
カラム温度:25℃
試料濃度: 0.1質量%
検出器: RI Model 504(GLサイエンス社製)
ポンプ: L6000(日立製作所(株)製)
流量: 1.0ml/min
校正曲線: 標準ポリスチレンSTK standard ポリスチレン(東ソー(株)製)Mw=2800000~500迄の13サンプルによる校正曲線を使用する。13サンプルは、ほぼ等間隔に用いることが好ましい。
本発明者らは、アスペクト比が特定の範囲にあり、かつ溶液吸収スペクトルにおいて特定の極大吸収を示す化合物が、高い位相差発現性と十分な逆波長分散特性を示すことを見出した。
(1)溶液吸収スペクトルにおいて、200nm以上350nm以下の波長領域に少なくとも2つの極大吸収を有する
(2)200nm以上350nm以下の波長領域における、2つの極大吸収のうち第一の極大吸収の波長をλmax1とし、第一の極大吸収波長よりも短波長側にある第二の極大吸収の波長をλmax2としたとき、(λmax1-λmax2)が20nm以上である
(3)分子のアスペクト比が1.70以上である
(4)分子内に、少なくとも1つの非芳香族炭化水素環、芳香族複素環または非芳香族複素環を有する
(5)熱可塑性樹脂に対して当該化合物が1質量%添加されたフィルムの、面内位相差上昇感度が0.1以上である
本発明に用いられる化合物は、フィルム厚みが小さくても、高い位相差を発現し、かつ良好な波長分散性を得るために、溶液吸収スペクトルにおいて、200nm以上350nm以下の波長領域に少なくとも2つの極大吸収を有する。そして、200nm以上350nm以下の波長領域における、2つの極大吸収が一定以上離れていること;具体的には、長波長側にある第一の極大吸収の波長をλmax1とし、短波長側にある第二の極大吸収の波長をλmax2としたとき、(λmax1-λmax2)が20nm以上であることを特徴とし、50nm以上であることがより好ましい。
本発明に用いられる化合物の、分子のアスペクト比が1.70以上であることを特徴とする。アスペクト比が1.70以上である化合物を用いることで、樹脂に対して異方的になり、逆波長分散性を高める効果が得られやすく、フィルムの膜厚が薄くても十分に高い位相差発現性を達成することができる。分子のアスペクト比が1.70未満であると、位相差を発現することはあるが、逆波長分散性を高める効果が得られにくい。これは、分子形状が円盤状に近くなるため、樹脂に対して等方的になり、逆波長分散性を高める効果が得られにくいものと推測される。また、本発明の化合物においては、アスペクト比は10以下が好ましい。アスペクト比が高すぎると、溶媒溶解性が劣悪となり、製造時の取り扱いに問題が生じる。アスペクト比として、より好ましくは5以下である。
本発明に用いられる化合物の面内位相差上昇感度が、0.1以上であることを特徴とし、0.12以上であることがより好ましい。「面内位相差上昇感度」とは、本発明に用いられる化合物を熱可塑性樹脂に対して1質量%添加したフィルムを、所定の条件で延伸したときの、延伸倍率に対する面内方向の位相差の上昇量の割合を示す。
1)熱可塑性樹脂と、それに対して1質量%の本発明に用いられる化合物とを含む、厚み60μmのフィルムを製造し、得られたフィルムを50mm角に切り出してサンプルフィルムとする。サンプルフィルムの中心から縦方向に15mmの2点と、横方向に15mmの2点の合計4点を測定点とする。そして、延伸前の縦方向の測定点間の距離(X0)、横方向の測定点間の距離(Y0)、および測定点に囲まれた中心部の波長550nmにおける面内方向の位相差R0A0(550)を測定する。
2)次いで、サンプルフィルムを、当該フィルムのガラス転移温度(Tg)+25℃の温度で、100%(延伸倍率2.0倍)の設定倍率で横方向に一軸延伸する。延伸後のサンプルフィルムにおける、延伸後の縦方向の測定点間距離(X1)、横方向の測定点間距離(Y1)および測定点で囲まれた中心部の面内方向の位相差R0A1(550)を測定する。
3)延伸後の縦方向の測定点間距離(X1)および横方向の測定点間距離(Y1)と、延伸前の縦方向の測定点間距離(X0)および横方向の測定点間距離(Y0)とから、実際にフィルムが延伸された倍率(実延伸倍率)を算出する。
実延伸倍率(%)=[(Y1-Y0)/Y0+(X0-X1)/X0]×100
また、延伸後の面内方向の位相差R0A1(550)と、延伸前の面内方向の位相差R0A0(550)とから、延伸により変化した位相差量(△R0A=R0A1(550)-R0A0(550))を算出する。そして、得られた△R0Aを、実延伸倍率で除して、フィルムの面内位相差感度Aを算出する。
A=△R0A/実延伸倍率(%)
面内位相差上昇感度=(サンプルフィルムの面内位相差感度A)-(ブランクフィルムの面内位相差感度B)
2)測定温度0~200℃、昇温速度10℃/分、降温速度10℃/分の条件で、Heat-Cool-Heatの温度制御で行う。そして、2nd Heatにおけるデータに基づいてガラス転移温度を求める。具体的には、第1の吸熱ピークの立ち上がり前のベースラインの延長線と、第1の吸熱ピークの立ち上がり部分からピーク頂点までの間で最大傾斜を示す接線を引き、その交点をガラス転移温度(Tg)とする。
本発明に用いられる化合物は、分子内に、少なくとも1つの非芳香族炭化水素環、芳香族複素環または非芳香族複素環を有することを特徴とする。
ハロゲン原子(フッ素原子、塩素原子、臭素原子、ヨウ素原子等)、
アルキル基(メチル基、エチル基、n-プロピル基、イソプロピル基、tert-ブチル基、n-オクチル基、2-エチルヘキシル基等)、
シクロアルキル基(シクロヘキシル基、シクロペンチル基、4-n-ドデシルシクロヘキシル基等)、
アルケニル基(ビニル基、アリル基等)、
シクロアルケニル基(2-シクロペンテン-1-イル、2-シクロヘキセン-1-イル基等)、アルキニル基(エチニル基、プロパルギル基等)、
アリール基(フェニル基、p-トリル基、ナフチル基等)、
ヘテロアリール基(2-ピロール基、2-フリル基、2-チエニル基、ピロール基、イミダゾリル基、オキサゾリル基、チアゾリル基、ベンゾイミダゾリル基、ベンゾオキサゾリル基、2-ベンゾチアゾリル基、ピラゾリノン基、ピリジル基、ピリジノン基、2-ピリミジニル基等)、
シアノ基、ヒドロキシル基、ニトロ基、カルボキシル基、
アルコキシ基(メトキシ基、エトキシ基、イソプロポキシ基、tert-ブトキシ基、n-オクチルオキシ基、2-メトキシエトキシ基等)、
アリールオキシ基(フェノキシ基、2-メチルフェノキシ基、4-tert-ブチルフェノキシ基、3-ニトロフェノキシ基、2-テトラデカノイルアミノフェノキシ基等)、
アシル基(アセチル基、ピバロイルベンゾイル基等)、
アシルオキシ基(ホルミルオキシ基、アセチルオキシ基、ピバロイルオキシ基、ステアロイルオキシ基、ベンゾイルオキシ基、p-メトキシフェニルカルボニルオキシ基等)、
アミノ基(アミノ基、メチルアミノ基、ジメチルアミノ基、アニリノ基、N-メチル-アニリノ基、ジフェニルアミノ基等)、
アシルアミノ基(ホルミルアミノ基、アセチルアミノ基、ピバロイルアミノ基、ラウロイルアミノ基、ベンゾイルアミノ基等)、
アルキルおよびアリールスルホニルアミノ基(メチルスルホニルアミノ基、ブチルスルホニルアミノ基、フェニルスルホニルアミノ基、2,3,5-トリクロロフェニルスルホニルアミノ基、p-メチルフェニルスルホニルアミノ基等)、
メルカプト基、
アルキルチオ基(メチルチオ基、エチルチオ基、n-ヘキサデシルチオ基等)、
アリールチオ基(フェニルチオ基、p-クロロフェニルチオ基、m-メトキシフェニルチオ基等)、
スルファモイル基(N-エチルスルファモイル基、N-(3-ドデシルオキシプロピル)スルファモイル基、N,N-ジメチルスルファモイル基、N-アセチルスルファモイル基、N-ベンゾイルスルファモイル基、N-(N’フェニルカルバモイル)スルファモイル基等)、
スルホ基、
カルバモイル基(カルバモイル基、N-メチルカルバモイル基、N,N-ジメチルカルバモイル基、N,N-ジ-n-オクチルカルバモイル基、N-(メチルスルホニル)カルバモイル基等)などが含まれる。
ハロゲン原子(フッ素原子、塩素原子、臭素原子、ヨウ素原子等)、
アルキル基(メチル基、エチル基、n-プロピル基、イソプロピル基、tert-ブチル基、n-オクチル基、2-エチルヘキシル基等)、
アルケニル基(ビニル基、アリル基等)、
アルキニル基(エチニル基、プロパルギル基等)、
シアノ基、ヒドロキシル基、ニトロ基、カルボキシル基、
アルコキシ基(メトキシ基、エトキシ基、イソプロポキシ基、tert-ブトキシ基、n-オクチルオキシ基、2-メトキシエトキシ基等)、
アシルオキシ基(ホルミルオキシ基、アセチルオキシ基、ピバロイルオキシ基、ステアロイルオキシ基等)、
アルコキシカルボニル基(メトキシカルボニル基、エトキシカルボニル基など)、
アリールオキシカルボニル基(フェノキシカルボニル基など)
アミノ基(アミノ基、メチルアミノ基、ジメチルアミノ基等)、
アシルアミノ基(ホルミルアミノ基、アセチルアミノ基、ピバロイルアミノ基、ラウロイルアミノ基等)、
アルキルスルホニルアミノ基(メチルスルホニルアミノ基、ブチルスルホニルアミノ基等)、
メルカプト基、
アルキルチオ基(メチルチオ基、エチルチオ基、n-ヘキサデシルチオ基等)、
スルファモイル基(N-エチルスルファモイル基、N-(3-ドデシルオキシプロピル)スルファモイル基、N,N-ジメチルスルファモイル基、N-アセチルスルファモイル基等)、
スルホ基、アシル基(アセチル基等)、
カルバモイル基(カルバモイル基、N-メチルカルバモイル基、N,N-ジメチルカルバモイル基、N,N-ジ-n-オクチルカルバモイル基、N-(メチルスルホニル)カルバモイル基等)などが含まれる。
ハロゲン原子(フッ素原子、塩素原子、臭素原子、ヨウ素原子等)、
アルキル基(メチル基、エチル基、n-プロピル基、イソプロピル基、tert-ブチル基、n-オクチル基、2-エチルヘキシル基等)、
シクロアルキル基(シクロヘキシル基、シクロペンチル基、4-n-ドデシルシクロヘキシル基等)、
アルケニル基(ビニル基、アリル基等)、
シクロアルケニル基(2-シクロペンテン-1-イル、2-シクロヘキセン-1-イル基等)、
アルキニル基(エチニル基、プロパルギル基等)、
アリール基(フェニル基、p-トリル基、ナフチル基等)、
ヘテロアリール基(2-フリル基、2-チエニル基、2-ピリミジニル基、2-ベンゾチアゾリル基、2-ピリジル基等)、
シアノ基、ヒドロキシル基、ニトロ基、カルボキシル基、
アルコキシ基(メトキシ基、エトキシ基、イソプロポキシ基、tert-ブトキシ基、n-オクチルオキシ基、2-メトキシエトキシ基等)、
アリールオキシ基(フェノキシ基、2-メチルフェノキシ基、4-tert-ブチルフェノキシ基、3-ニトロフェノキシ基、2-テトラデカノイルアミノフェノキシ基等)、
アシルオキシ基(ホルミルオキシ基、アセチルオキシ基、ピバロイルオキシ基、ステアロイルオキシ基、ベンゾイルオキシ基、p-メトキシフェニルカルボニルオキシ基等)、
アミノ基(アミノ基、メチルアミノ基、ジメチルアミノ基、アニリノ基、N-メチル-アニリノ基、ジフェニルアミノ基等)、
アシルアミノ基(ホルミルアミノ基、アセチルアミノ基、ピバロイルアミノ基、ラウロイルアミノ基、ベンゾイルアミノ基等)、
アルキルおよびアリールスルホニルアミノ基(メチルスルホニルアミノ基、ブチルスルホニルアミノ基、フェニルスルホニルアミノ基、2,3,5-トリクロロフェニルスルホニルアミノ基、p-メチルフェニルスルホニルアミノ基等)、
メルカプト基、
アルキルチオ基(メチルチオ基、エチルチオ基、n-ヘキサデシルチオ基等)、
アリールチオ基(フェニルチオ基、p-クロロフェニルチオ基、m-メトキシフェニルチオ基等)、
スルファモイル基(N-エチルスルファモイル基、N-(3-ドデシルオキシプロピル)スルファモイル基、N,N-ジメチルスルファモイル基、N-アセチルスルファモイル基、N-ベンゾイルスルファモイル基、N-(N’フェニルカルバモイル)スルファモイル基等)、
スルホ基、
アシル基(アセチル基、ピバロイルベンゾイル基等)、
カルバモイル基(カルバモイル基、N-メチルカルバモイル基、N,N-ジメチルカルバモイル基、N,N-ジ-n-オクチルカルバモイル基、N-(メチルスルホニル)カルバモイル基等)などが含まれる。
糖エステル化合物は、フラノース構造もしくはピラノース構造を1~12個有する化合物であって、該化合物中の水酸基の全部または一部がエステル化された化合物である。
本発明の光学フィルムは、紫外線吸収剤をさらに含有していてもよい。紫外線吸収剤は、ベンゾトリアゾール系、2-ヒドロキシベンゾフェノン系またはサリチル酸フェニルエステル系等でありうる。具体的には、2-(5-メチル-2-ヒドロキシフェニル)ベンゾトリアゾール、2-[2-ヒドロキシ-3,5-ビス(α,α-ジメチルベンジル)フェニル]-2H-ベンゾトリアゾール、2-(3,5-ジ-t-ブチル-2-ヒドロキシフェニル)ベンゾトリアゾール等のトリアゾール類や;2-ヒドロキシ-4-メトキシベンゾフェノン、2-ヒドロキシ-4-オクトキシベンゾフェノン、2,2’-ジヒドロキシ-4-メトキシベンゾフェノン等のベンゾフェノン類などが挙げられる。
ビス(2,2,6,6-テトラメチル-4-ピペリジル)セバケート、ビス(1,2,2,6,6-ペンタメチル-4-ピペリジル)セバケート等のヒンダードアミン系;
2-(3,5-ジ-t-ブチル-4-ヒドロキシベンジル)-2-n-ブチルマロン酸ビス(1,2,2,6,6-ペンタメチル-4-ピペリジル)、1-[2-[3-(3,5-ジ-t-ブチル-4-ヒドロキシフェニル)プロピオニルオキシ]エチル]-4-[3-(3,5-ジ-t-ブチル-4-ヒドロキシフェニル)プロピオニルオキシ]-2,2,6,6-テトラメチルピペリジン等の分子内にヒンダードフェノールとヒンダードアミンの構造を共に有するハイブリッド系のもの;などが含まれ、好ましくは2-[2-ヒドロキシ-3,5-ビス(α,α-ジメチルベンジル)フェニル]-2-ベンゾトリアゾールや2,2-メチレンビス[4-(1,1,3,3-テトラブチル)-6-(2H-ベンゾトリアゾール-2-イル)フェノール]である。これらは、一種類であっても、二種以上を併用してもよい。
微粒子は、無機化合物または有機化合物からなる。無機化合物の例には、二酸化珪素、二酸化チタン、酸化アルミニウム、酸化ジルコニウム、炭酸カルシウム、炭酸カルシウム、タルク、クレイ、焼成カオリン、焼成ケイ酸カルシウム、水和ケイ酸カルシウム、ケイ酸アルミニウム、ケイ酸マグネシウムおよびリン酸カルシウムなどが含まれる。有機化合物の例には、ポリテトラフルオロエチレン、セルロースアセテート、ポリスチレン、ポリメチルメタクリレート、ポリプロピルメタクリレート、ポリメチルアクリレート、ポリエチレンカーボネート、アクリルスチレン系樹脂、シリコーン系樹脂、ポリカーボネート樹脂、ベンゾグアナミン系樹脂、メラミン系樹脂、ポリオレフィン系粉末、ポリエステル系樹脂、ポリアミド系樹脂、ポリイミド系樹脂、あるいはポリ弗化エチレン系樹脂、澱粉等の有機高分子化合物の粉砕分級物、懸濁重合法で合成した高分子化合物、スプレードライ法あるいは分散法等により球型にした高分子化合物などでありうる。
本発明の光学フィルムは、微粒子の分散性を高めるためなどから、分散剤をさらに含有していてもよい。分散剤は、アミン系分散剤およびカルボキシル基含有高分子分散剤から選ばれる1種もしくは2種以上である。
本発明の光学フィルムは、23℃55%RHの条件下で、波長550nmで測定される面内方向の位相差R0(550)が、下記の(a)を満たすことが好ましい。R0(550)が以下の範囲を満たす光学フィルムは、例えばλ/4位相差フィルムとして好ましく機能しうる。
(a) 110nm≦R0(550)≦170nm
(b) 0.72≦R0(450)/R0(550)≦0.96
(c) 0.83≦R0(550)/R0(650)≦0.97
式(I):R0=(nx-ny)×d(nm)
式(II):Rth={(nx+ny)/2-nz}×d(nm)
(式(I)および(II)において、
nxは、光学フィルムの面内方向において屈折率が最大になる遅相軸方向xにおける屈折率を表し;
nyは、光学フィルムの面内方向において前記遅相軸方向xと直交する方向yにおける屈折率を表し;
nzは、光学フィルムの厚み方向zにおける屈折率を表し;
d(nm)は、光学フィルムの厚みを表す)
1)光学フィルムを、23℃55%RHで調湿する。調湿後の光学フィルムの、450nm、550nmおよび650nmにおける平均屈折率を、アッベ屈折計と分光光源を用いて測定する。また、光学フィルムの厚みを、膜厚計を用いて測定する。
2)調湿後の光学フィルムに、フィルム表面の法線と平行に、測定波長450nm、550nmまたは650nmの光を入射させたときの面内方向の位相差R0(450)、R0(550)またはR0(650)を、Axometric社製のAxoScanにて測定する。
3)Axometric社製のAxoScanにより、光学フィルムの面内の遅相軸を傾斜軸(回転軸)として、光学フィルムの表面の法線に対してφの角度(入射角(φ))から測定波長450nm、550nmまたは650nmの光を入射させたときの位相差R(φ)をそれぞれ測定する。位相差R(φ)の測定は、φが0°~50°の範囲で、10°毎に6点行うことができる。光学フィルムの面内の遅相軸は、Axometric社製のAxoScanにより確認することができる。
4)各波長(λ)にて測定されたR0およびR(φ)と、前述の平均屈折率と膜厚とから、Axometric社製のAxoScanにより、nx、nyおよびnzを算出する。そして、下記式(I)および(II)に基づいて、測定波長450nm、550nmまたは650nmでの厚み方向の位相差Rth(450)、Rth(550)またはRth(650)を、それぞれ算出する。位相差の測定は、23℃55%RH条件下で行うことができる。
式(I):R0(λ)=(nx(λ)-ny(λ))×d(nm)
式(II):Rth(λ)={(nx(λ)+ny(λ))/2-nz(λ)}×d(nm)
(式(I)および(II)において、
nx(λ)は、波長λの光を入射させたときの、光学フィルムの面内方向において屈折率が最大になる遅相軸方向xにおける屈折率を表し;
ny(λ)は、波長λの光を入射させたときの、光学フィルムの面内方向において前記遅相軸方向xと直交する方向yにおける屈折率を表し;
nz(λ)は、波長λの光を入射させたときの、光学フィルムの厚み方向zにおける屈折率を表し;
d(nm)は、光学フィルムの厚みを表す)
(d) 0≦Nz=Rth(550)/R0(550)+0.5≦1
式(I):R0(λ)=(nx(λ)-ny(λ))×d(nm)
式(II):Rth(λ)={(nx(λ)+ny(λ))/2-nz(λ)}×d(nm)
(式(I)および(II)において、
nx(λ)は、波長λの光を入射させたときの、光学フィルムの面内方向において屈折率が最大になる遅相軸方向xにおける屈折率を表し;
ny(λ)は、波長λの光を入射させたときの、光学フィルムの面内方向において前記遅相軸方向xと直交する方向yにおける屈折率を表し;
nz(λ)は、波長λの光を入射させたときの、光学フィルムの厚み方向zにおける屈折率を表し;
d(nm)は、光学フィルムの厚みを表す)
本発明の光学フィルムは、溶液流延法または溶融流延法で製造されうる。光学フィルムの着色や異物欠点、ダイラインなどの光学欠点を抑制する観点では、溶液流延法が好ましく;光学フィルムに溶媒が残留するのを抑制する観点では、溶融流延法が好ましい。
セルロースアセテートを含む光学フィルムを溶液流延法で製造する方法は、A1)少なくともセルロースアセテートと、必要に応じて他の添加剤とを溶剤に溶解させてドープを調製する工程、A2)ドープを無端の金属支持体上に流延する工程、A3)流延したドープから溶媒を蒸発させてウェブとする工程、A4)ウェブを金属支持体から剥離する工程、A5)ウェブを乾燥後、延伸してフィルムを得る工程を含む。
溶解釜において、セルロースアセテートと、必要に応じて他の添加剤とを溶剤に溶解させてドープを調製する。
1)2枚の偏光板をクロスニコル状態に配置し、それらの間に得られたフィルムを配置する。
2)一方の偏光板の側から光を当てて、他方の偏光板の側から観察したときに、光が漏れてみえる点(異物)の数をカウントする。
ドープを、加圧ダイのスリットから無端状の金属支持体上に流延させる。
ウェブ(ドープを金属支持体上に流延して得られるドープ膜)を金属支持体上で加熱し、溶媒を蒸発させる。ウェブの乾燥方法や乾燥条件は、前述のA2)流延工程と同様としうる。
金属支持体上で溶媒を蒸発させたウェブを、金属支持体上の剥離位置で剥離する。
残留溶媒量(%)=(ウェブの加熱処理前質量-ウェブの加熱処理後質量)/(ウェブの加熱処理後質量)×100
なお、残留溶媒量を測定する際の加熱処理とは、115℃で1時間の加熱処理を意味する。
金属支持体から剥離して得られたウェブを、必要に応じて乾燥させた後、延伸する。ウェブの乾燥は、ウェブを、上下に配置した多数のロールにより搬送しながら乾燥させてもよいし、ウェブの両端部をクリップで固定して搬送しながら乾燥させてもよい。
本発明の光学フィルムを溶融流延法で製造する方法は、B1)溶融ペレットを製造する工程(ペレット化工程)、B2)溶融ペレットを溶融混練した後、押し出す工程(溶融押出し工程)、B3)溶融樹脂を冷却固化してウェブを得る工程(冷却固化工程)、B4)ウェブを延伸する工程(延伸工程)、を含む。
光学フィルムの主成分である熱可塑性樹脂を含む樹脂組成物は、あらかじめ混練してペレット化しておくことが好ましい。ペレット化は、公知の方法で行うことができ、例えば前述の熱可塑性樹脂と、必要に応じて可塑剤などの添加剤とを含む樹脂組成物を、押し出し機にて溶融混錬した後、ダイからストランド状に押し出す。ストランド状に押し出された溶融樹脂を、水冷または空冷した後、カッティングしてペレットを得ることができる。
得られた溶融ペレットと、必要に応じて他の添加剤とを、ホッパーから押し出し機に供給する。ペレットの供給は、ペレットの酸化分解を防止するためなどから、真空下、減圧下または不活性ガス雰囲気下で行うことが好ましい。そして、押し出し機にて、溶融ペレットと、必要に応じて他の添加剤と(フィルム材料)を溶融混練する。
ダイから押し出された樹脂を、冷却ロールと弾性タッチロールとでニップして、フィルム状の溶融樹脂を所定の厚みにする。そして、フィルム状の溶融樹脂を、複数の冷却ロールで段階的に冷却して固化させる。
得られたウェブを、延伸機にて延伸してフィルムを得る。延伸は、ウェブの幅方向(TD方向)、搬送方向(MD方向)、または斜め方向のいずれか一以上の方向に行う。得られる光学フィルムの面内遅相軸と、フィルムの幅方向とのなす角度θ1を40~50°とするためには、少なくとも斜め方向;具体的には、ウェブの幅方向に対して45°方向に延伸することが好ましい。
本発明の円偏光板は、偏光子(直線偏光膜)と、その少なくとも一方の面に配置された本発明の光学フィルムとを含む。本発明の光学フィルムは、偏光子に直接配置されてもよいし、他の層またはフィルムを介して配置されてもよい。
本発明の画像表示装置は、本発明の光学フィルムを含む。本発明の画像表示装置の例には、有機EL表示装置や液晶表示装置などが含まれる。
樹脂(VI)のペレットの製造
(合成例1)
撹拌装置、温度センサー、冷却管、窒素導入管を付した反応釜に、204kgのメタクリル酸メチル(MMA)、51kgの2-(ヒドロキシメチル)アクリル酸メチル(MHMA)、249kgのトルエンを仕込んだ。これに、窒素を通じつつ、105℃まで昇温し、還流したところで、重合開始剤として281gのターシャリーアミルパーオキシイソノナノエート(アトフィナ吉富製、商品名:ルペロックス570)を添加し、さらに561gの重合開始剤と5.4kgのトルエンからなる溶液を2時間かけて滴下しながら、還流下(約105~110℃)で溶液重合を行った。その後、さらに4時間かけて熟成を行った。
表2~5の化合物を、テトラヒドロフラン(安定剤なし)に溶解させて、濃度10-4mol/Lの溶液を得た。得られた溶液を、石英セル(10mm長四角セル)に入れて、紫外可視赤外分光光度計(U-570、日本分光社製)を用いて、溶液の、波長領域200~350nmの範囲の吸光度を測定した。
表2~5の化合物のアスペクト比を、前述の方法で算出した。
1)熱可塑性樹脂と、それに対して1重量%の表2~5の化合物とを含む、50mm×50mm×厚み60μmのサンプルフィルムを作製し、前述の方法により、サンプルフィルムの面内方向の位相差感度Aを算出した。
2)一方、表2~5の化合物を含有させなかった以外は前記1)と同様にしてブランクフィルムを作製し、ブランクフィルムの面内方向の位相差感度Bを測定した。
面内位相差上昇感度=(サンプルフィルムの面内方向の位相差感度A)-(ブランクフィルムの面内方向の位相差感度B)
(比較例1)
(光学フィルム1の製造)
微粒子分散液1の調製
下記成分を、ディゾルバーで50分間攪拌混合した後、マントンゴーリンで分散させて、微粒子分散液1を得た。
(微粒子分散液1)
微粒子(アエロジル R972V 日本アエロジル(株)製):11質量部
エタノール:89質量部
得られた微粒子分散液1を、メチレンクロライドを投入した溶解タンクに十分攪拌しながらゆっくりと添加した。得られた溶液を、微粒子の二次粒子の粒径が所定の大きさとなるようにアトライターにて分散させた後、日本精線(株)製のファインメットNFで濾過して、微粒子添加液1を得た。
(微粒子添加液1)
メチレンクロライド:99質量部
微粒子分散液1:5質量部
加圧溶解タンクに、メチレンクロライドとエタノールを投入し、さらに樹脂(I)、糖エステル化合物、比較化合物(i)および微粒子添加液1を攪拌しながら投入した。得られた溶液を加熱し、攪拌しながら完全に溶解させた。得られた溶液を、安積濾紙(株)製の安積濾紙No.244を使用して濾過し、ドープ液を得た。
(ドープ液の組成)
メチレンクロライド:520質量部
エタノール:45質量部
樹脂(I):100質量部
下記の糖エステル化合物A:5質量部
比較化合物(i):5質量部
微粒子添加液1:1質量部
偏光子の作製
厚さ120μmのポリビニルアルコールフィルムを、延伸温度110℃、延伸倍率5倍の条件で一軸延伸した。得られたフィルムを、ヨウ素0.075g、ヨウ化カリウム5g、水100gからなる水溶液に60秒間浸漬した後、ヨウ化カリウム6g、ホウ酸7.5g、水100gからなる68℃の水溶液に浸漬した。得られたフィルムを、水洗、乾燥して厚さ20μmの偏光子を得た。
上記で作製した光学フィルム1の、偏光子との貼り合わせ面をアルカリけん化処理した。同様に、コニカミノルタタックフィルムKC6UA(コニカミノルタオプト(株)製)を準備し、その偏光子との貼り合わせ面を、アルカリケン化処理した。そして、偏光子の一方の面に、光学フィルム1を、粘着剤であるポリビニルアルコール5%水溶液を介して貼り合わせ;偏光子の他方の面に、コニカミノルタタックフィルムKC6UA(コニカミノルタオプト(株)製)を、ポリビニルアルコール5%水溶液を介して貼り合わせて、円偏光板1を作製した。光学フィルム1と偏光子との貼り合わせは、偏光子の透過軸と光学フィルム1の遅相軸とのなす角が45°となるように行った。
ガラス基板上に、スパッタリング法により、厚さ80nmのクロムからなる光反射電極を形成し;この光反射電極上に、陽極として厚さ40nmのITOの薄膜を形成した。次いで、この陽極上に、スパッタリング法により、厚さ80nmのポリ(3,4-エチレンジオキシチオフェン)-ポリスチレンスルホネート(PEDOT:PSS)からなる正孔輸送層を形成し;この正孔輸送層上に、シャドーマスクを用いて、RGBの発光層(赤色発光層、緑色発光層および青色発光層)をそれぞれパターニング形成した。発光層の厚みは、各色毎に100nmとした。赤色発光層は、ホストとしてトリス(8-ヒドロキシキノリナート)アルミニウム(Alq3)と発光性化合物[4-(dicyanomethylene)-2-methyl-6(p-dimethylaminostyryl)-4H-pyran](DCM)とを共蒸着(質量比99:1)して形成し;緑色発光層は、ホストとしてAlq3と、発光性化合物クマリン6とを共蒸着(質量比99:1)して形成し;青色発光層は、ホストとしてBalqと発光性化合物Peryleneとを共蒸着(質量比90:10)して形成した。
表示装置の表示画面から60cm離れた位置に設置した市販のデスクスタンド(MITSUBISHI inverter BB giraffe)で、表示画面に光を照射させた状態で、表示装置に黒画像を1時間表示させた。黒画像の表示は、発光層を発光させない状態とした。その後、表示装置の表示画面から1m離れた位置に設置した輝度計(コニカミノルタ社製:CS-2000)で、表示画面の法線に対して倒れ角0.2°以内の視野で輝度を測定した。また、表示装置の表示画面から1m離れた位置において、観察者が、表示画面の黒さや色味のずれを官能評価した。正面方向の光漏れの評価は、以下の基準に基づいて行った。
◎:輝度が2cd/m2より小さく、かつ黒く引き締まって見える
○:輝度が2cd/m2以上3cd/m2以内であり、かつ黒く引き締まって見える
×:輝度が3cd/m2より大きいか、または黒く見えず、色付いて見える
23℃、55%RHの恒温恒湿室にて、表示装置の表示画面から60cm離れた位置に設置した市販のデスクスタンド(MITSUBISHI inverter BB giraffe)で、表示画面に光を照射させた状態で、表示装置に黒画像を1時間表示させた。黒画像の表示は、発光層を発光させない状態とした。その後、表示装置の表示画面の、正面方向から観察したときの黒味のレベルと、表示画面の法線に対して45°の方向からの観察したときの黒味のレベルとを官能評価し、その差を比較した。斜め方向の色味の評価は、以下の基準に基づいて行った。
◎:正面方向と斜め方向とで、全く黒味に変化は見られない
○:正面方向と斜め方向とで、僅かに黒味に差は見られるが、気にならない程度
×:正面方向と斜め方向とで、外光反射の違いが気になる
光学フィルム2~13の製造
比較化合物iを表6に記載通りの化合物に変更した以外は、光学フィルム1と同様の方法で原反フィルムを作成した。これを光学フィルム1と同様に、原反フィルムのガラス転移温度+20℃にて実延伸倍率110%で斜め方向に延伸し、膜厚85μmの光学フィルム2~13を得た。いずれのフィルムも面内遅相軸とフィルムの幅手方向とのなす角度θは45°だった。
光学フィルム14の製造
比較化合物iを、A-46に変更した以外は、光学フィルム1と同様の方法で原反フィルムを作成した。これを光学フィルム1と同様に、原反フィルムのガラス転移温度+20℃にて実延伸倍率130%で斜め方向に延伸し、膜厚80μmの光学フィルム14を得た。面内遅相軸とフィルムの幅手方向とのなす角度θは45°だった。
次いで、光学フィルム1を光学フィルム14に変更した以外は比較例1と同様にして円偏光板14および表示装置14を作製し、表示装置の評価を行った。
光学フィルム15~19の製造
A-46を、表7に記載通りの化合物および添加量に変更した以外は、光学フィルム14と同様の方法で原反フィルムを作成した。これを光学フィルム14と同様に、原反フィルムのガラス転移温度+20℃にて実延伸倍率130%で斜め方向に延伸し、膜厚80μmの光学フィルム15~19を得た。いずれのフィルムも、面内遅相軸とフィルムの幅手方向とのなす角度θは45°だった。
光学フィルム20の製造
ドープ液の組成を以下のように変更した以外は、比較例1と同様の方法でドープ液を得た。
(ドープ液の組成)
メチレンクロライド:523質量部
エタノール:45質量部
樹脂(II):100質量部
糖エステル化合物A:5質量部
A-62:3質量部
微粒子添加液1:1質量部
次いで、光学フィルム1を光学フィルム20に変更した以外は比較例1と同様にして円偏光板20および表示装置20を作製し、表示装置の評価を行った。
光学フィルム21の製造
比較化合物iをA-68に変更し、添加量を4質量部にした以外は、比較例1と同様の方法で原反フィルムを作成した。これを原反フィルムのガラス転移温度+20℃にて実延伸倍率110%で搬送方向に延伸し、Ro(550)が140nmの光学フィルム21を得た。面内遅相軸とフィルムの幅手方向とのなす角度θは90°だった。
次いで、光学フィルム21を、面内遅相軸がピースの横辺から45°の方向に向くようにピース状に切り出してから、偏光子との貼り合わせ面をアルカリけん化処理をし、それ以外は比較例1と同様にして円偏光板21および表示装置21を作製し、表示装置の評価を行った。
光学フィルム22の製造
ドープ液の組成を以下のように変更した以外は、比較例1と同様の方法でドープ液を得た。
(ドープ液の組成)
メチレンクロライド:260質量部
エタノール:35質量部
樹脂(VI):100質量部
化合物A-68:5質量部
次いで、光学フィルム1を光学フィルム22に変更した以外は比較例1と同様にして円偏光板22および表示装置22を作製し、表示装置の評価を行った。
光学フィルム23の製造
ドープ液の組成を以下のように変更した以外は、比較例1と同様の方法でドープ液を得た。
(ドープ液の組成)
メチレンクロライド:100質量部
エタノール:19質量部
樹脂(III):30質量部
樹脂(V):70質量部
糖エステル化合物A:5質量部
A-68:10質量部
微粒子添加液1:1質量部
次いで、光学フィルム1を光学フィルム23に変更した以外は比較例1と同様にして円偏光板23および表示装置23を作製し、表示装置の評価を行った。
光学フィルム24および27の製造
添加する化合物とその添加量を表8に記載通りに変更した以外は、光学フィルム1と同様の方法で原反フィルムを作成した。これを光学フィルム1と同様に、原反フィルムのガラス転移温度+20℃にて実延伸倍率110%で斜め方向に延伸し、Ro(550)が140nmの光学フィルム24および27を得た。いずれのフィルムも面内遅相軸とフィルムの幅手方向とのなす角度θは45°だった。
次いで、光学フィルム1を光学フィルム24および27に変更した以外は比較例1と同様にして円偏光板24および27、ならびに表示装置24および27を作製し、表示装置の評価を行った。
光学フィルム25の製造
ドープ液の組成を以下のように変更した以外は、比較例1と同様の方法でドープ液を得た。
(ドープ液の組成)
メチレンクロライド:384質量部
エタノール:73質量部
樹脂(III):100質量部
糖エステル化合物A:5質量部
A-46:3質量部
微粒子添加液1:1質量部
次いで、光学フィルム1を光学フィルム25に変更した以外は比較例1と同様にして円偏光板25および表示装置25を作製し、表示装置の評価を行った。
光学フィルム26の製造
ドープ液の組成を以下のように変更した以外は、比較例1と同様の方法でドープ液を得た。
(ドープ液の組成)
メチレンクロライド:467質量部
エタノール:40質量部
樹脂(IV):100質量部
糖エステル化合物A:5質量部
A-68:2質量部
微粒子添加液1:1質量部
次いで、光学フィルム1を光学フィルム26に変更した以外は比較例1と同様にして円偏光板26および表示装置26を作製し、表示装置の評価を行った。
光学フィルム28および29の製造
添加する化合物とその添加量を表8に記載通りに変更した以外は、光学フィルム25と同様の方法で原反フィルムを作成した。これを光学フィルム1と同様に、原反フィルムのガラス転移温度+20℃にて実延伸倍率110%で斜め方向に延伸し、Ro(550)が140nmの光学フィルム28および29を得た。いずれのフィルムも面内遅相軸とフィルムの幅手方向とのなす角度θは45°だった。
次いで、光学フィルム1を光学フィルム28および29に変更した以外は比較例1と同様にして円偏光板28および29、ならびに表示装置28および29を作製し、表示装置の評価を行った。
12 光反射電極
14 発光層
16 透明電極層
18 透明基板
20 円偏光板
20A λ/4位相差フィルム
20B 偏光子(直線偏光膜)
30 液晶表示装置
40 液晶セル
50 第一の偏光板
52 第一の偏光子
54 保護フィルム(F1)
56 保護フィルム(F2)
60 第二の偏光板
62 第二の偏光子
64 保護フィルム(F3)
66 保護フィルム(F4)
70 バックライト
Claims (14)
- 熱可塑性樹脂と、下記(1)~(5)を全て満たす少なくとも1種類の化合物とを含有する光学フィルムであって、
(1)溶液吸収スペクトルにおいて、200nm以上350nm以下の波長領域に少なくとも2つの極大吸収を有する
(2)200nm以上350nm以下の波長領域における、2つの極大吸収のうち第一の極大吸収の波長をλmax1とし、前記第一の極大吸収よりも短波長側にある第二の極大吸収の波長をλmax2としたとき、(λmax1-λmax2)が20nm以上である
(3)分子のアスペクト比が1.70以上である
(4)分子内に、非芳香族炭化水素環、芳香族複素環または非芳香族複素環を有する
(5)前記熱可塑性樹脂と、前記熱可塑性樹脂に対して1質量%の前記化合物とを含有する厚み60μmのサンプルフィルムの、延伸前の波長550nmにおける面内方向の位相差をR0A0(550)とし、前記サンプルフィルムのガラス転移温度よりも25℃高い温度で延伸後の波長550nmにおける面内方向の位相差をR0A1(550)としたとき、(R0A1(550)-R0A0(550))を延伸倍率で除して得られる面内位相差感度をAとし、
前記熱可塑性樹脂からなる厚み60μmのブランクフィルムの、波長550nmにおける延伸前の面内方向の位相差をR0B0(550)とし、前記ブランクフィルムのガラス転移温度よりも25℃高い温度で延伸後の波長550nmにおける面内方向の位相差をR0B1(550)としたとき、(R0B1(550)-R0B0(550))を延伸倍率で除して得られる面内位相差感度をBとしたとき、
(A-B)で定義される面内位相差上昇感度が0.1以上である
波長450nm、550nmおよび650nmで測定される面内方向の位相差をそれぞれR0(450)、R0(550)およびR0(650)としたとき、式(a)~(c)を全て満たすことを特徴とする、光学フィルム。
(a)110nm≦R0(550)≦170nm
(b)0.72≦R0(450)/R0(550)≦0.96
(c)0.83≦R0(550)/R0(650)≦0.97 - 前記熱可塑性樹脂が、セルロース誘導体を含有することを特徴とする、請求項1に記載の光学フィルム。
- 前記化合物が、分子内に少なくとも一つの非芳香族環を有することを特徴とする、請求項1に記載の光学フィルム。
- 前記化合物の、前記(λmax1-λmax2)が50nm以上であることを特徴とする、請求項1に記載の光学フィルム。
- 前記光学フィルムの面内の遅相軸方向の屈折率をnxとし、前記光学フィルムの面内において前記遅相軸と直交する方向の屈折率をnyとし、前記光学フィルムの厚み方向の屈折率をnzとしたとき、式(d)の関係をさらに満たすことを特徴とする、請求項1に記載の光学フィルム。
(d)0≦Nz=Rth(550)/R0(550)+0.5≦1 - 前記化合物が、下記一般式(A)で表されることを特徴とする、請求項1に記載の光学フィルム。
Qは、芳香族炭化水素環、非芳香族炭化水素環、芳香族複素環または非芳香族複素環を表し;
WaおよびWbは、前記Qの環を構成する原子に結合する水素原子または置換基であり、前記Waが結合する原子と前記Wbが結合する原子とは互いに隣り合っており、かつ前記Waと前記Wbとは互いに異なっており、WaとWbは互いに結合して環を形成してもよく;
R3は、置換基を表し;
mは、0~2の整数であり;
mが2の場合、R3は互いに同じでも異なっていてもよく;
nは、1~10の整数を表し;nが2以上である場合、複数のQ、L2、Wa、Wb、R3、mは、互いに同一であっても異なっていてもよく;
L1およびL2は、それぞれ独立に単結合またはアルキレン基、アルケニレン基、アルキニレン基、-O-、-(C=O)-、-(C=O)-O-、-NRL-、-S-、-(O=S=O)-および-(C=O)-NRL-からなる群より選ばれる2価の連結基またはそれらの組合せを表し;
RLは、水素原子または置換基を表し;
R1およびR2は、それぞれ独立に置換基を表す) - 前記一般式(A)で表される化合物が、下記一般式(B)で表される化合物であることを特徴とする、請求項1に記載の光学フィルム。
WaおよびWbは、前記Qの環を構成する原子に結合する水素原子または置換基であり、前記Waが結合する原子と前記Wbが結合する原子とは互いに隣り合っており、かつ前記Waと前記Wbとは互いに異なっており、WaとWbは互いに結合して環を形成してもよく;
R3は、置換基を表し;
mは、0~2の整数であり;
mが2の場合、R3は互いに同じでも異なっていてもよく;
L1およびL2は、それぞれ独立に単結合またはアルキレン基、アルケニレン基、アルキニレン基、-O-、-(C=O)-、-(C=O)-O-、-NRL-、-S-、-(O=S=O)-および-(C=O)-NRL-からなる群より選ばれる2価の連結基またはそれらの組合せを表し;
RLは、水素原子または置換基を表し;
R1およびR2は、それぞれ独立に置換基を表す) - 前記一般式(B)で表される化合物が、下記一般式(1B)で表される化合物であることを特徴とする、請求項1に記載の光学フィルム。
WaおよびWbは、前記Qの環を構成する原子に結合する水素原子または置換基であり、前記Waが結合する原子と前記Wbが結合する原子とは互いに隣り合っており、かつ前記Waと前記Wbとは互いに異なっており、WaとWbは互いに結合して環を形成してもよく;
R3は、置換基を表し;
mは、0~2の整数であり;
mが2の場合、R3は互いに同じでも異なっていてもよく;
L1およびL2は、それぞれ独立に単結合またはアルキレン基、アルケニレン基、アルキニレン基、-O-、-(C=O)-、-(C=O)-O-、-NRL-、-S-、-(O=S=O)-および-(C=O)-NRL-からなる群より選ばれる2価の連結基またはそれらの組合せを表し;
RLは、水素原子または置換基を表し;
R1およびR2は、それぞれ独立に置換基を表す) - 前記一般式(B)で表される化合物が、下記一般式(2B)で表されることを特徴とする、請求項1に記載の光学フィルム。
W1は、環状基であって、W1の環構成原子のうちベンゼン環と結合する原子が、炭素原子または窒素原子であり;
R3は、置換基を表し;
mは、0~2の整数であり;
mが2の場合、R3は互いに同じでも異なっていてもよく;
L1およびL2は、それぞれ独立に単結合またはアルキレン基、アルケニレン基、アルキニレン基、-O-、-(C=O)-、-(C=O)-O-、-NRL-、-S-、-(O=S=O)-および-(C=O)-NRL-からなる群より選ばれる2価の連結基またはそれらの組合せを表し;
RLは、水素原子または置換基を表し;
R1およびR2は、それぞれ独立に置換基を表す) - 前記光学フィルムの厚みは、10~100μmであることを特徴とする、請求項1に記載の光学フィルム。
- 前記化合物の含有量は、前記熱可塑性樹脂に対して1~15質量%であることを特徴とする、請求項1に記載の光学フィルム。
- 前記光学フィルムの面内の遅相軸と前記光学フィルムの幅手方向とのなす角度が40°以上50°以下であることを特徴とする、請求項1に記載の光学フィルム。
- 請求項1に記載の光学フィルムを含むことを特徴とする、円偏光板。
- 請求項1に記載の光学フィルムを含むことを特徴とする、画像表示装置。
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US14/379,994 US9500790B2 (en) | 2012-02-22 | 2013-02-19 | Optical film, circularly polarizing plate, and image display device |
JP2014500917A JP6003976B2 (ja) | 2012-02-22 | 2013-02-19 | 光学フィルム、円偏光板および画像表示装置 |
KR1020147022953A KR101635298B1 (ko) | 2012-02-22 | 2013-02-19 | 광학 필름, 원편광판 및 화상 표시 장치 |
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US9500790B2 (en) | 2016-11-22 |
KR101635298B1 (ko) | 2016-06-30 |
US20150247963A1 (en) | 2015-09-03 |
JP6003976B2 (ja) | 2016-10-05 |
CN104136947B (zh) | 2016-09-21 |
TW201346312A (zh) | 2013-11-16 |
CN104136947A (zh) | 2014-11-05 |
KR20140125385A (ko) | 2014-10-28 |
TWI513994B (zh) | 2015-12-21 |
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